stage3/constant_folding.cc
author mjsousa
Sat, 27 Dec 2014 09:41:01 +0000
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parent 974 a47c2df5ae3d
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/*
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 *  matiec - a compiler for the programming languages defined in IEC 61131-3
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 *
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 *  Copyright (C) 2003-2011  Mario de Sousa (msousa@fe.up.pt)
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 *  Copyright (C) 2012       Manuele Conti (conti.ma@alice.it)
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 *
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 *  This program is free software: you can redistribute it and/or modify
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 *  it under the terms of the GNU General Public License as published by
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 *  the Free Software Foundation, either version 3 of the License, or
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 *  (at your option) any later version.
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 *
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 *  This program is distributed in the hope that it will be useful,
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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *  GNU General Public License for more details.
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 *
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 *  You should have received a copy of the GNU General Public License
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 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 *
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 *
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 * This code is made available on the understanding that it will not be
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 * used in safety-critical situations without a full and competent review.
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 */
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/*
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 * An IEC 61131-3 compiler.
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 *
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 * Based on the
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 * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
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 *
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 */
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/* TODO: 
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 *         - Add support for comparison (= and !=) of enumeration literals!
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 *              We will need to add another const_value entry to the symbol_c, containing the 
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 *              possible enumeration value of the enum constant!
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 *              Doing this will allow us to more easily implement a constant_propagation_c later on!
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 *
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 *         - Add support for comparison (= and !=) of the exact same variable
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 *                (e.g. if (int_v = int_v) then ...)
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 */
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/* Do constant folding...
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 *
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 * I.e., Determine the value of all expressions in which only constant values (i.e. literals) are used.
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 * The (constant) result of each operation is stored (annotated) in the respective operation symbol 
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 * (e.g.: add_expression_c) in the abstract syntax tree,
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 *
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 * For example:
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 *       2 + 3         -> the constant value '5'    is stored in the add_expression_c symbol.
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 *       22.2 - 5.0    -> the constant value '17.2' is stored in the add_expression_c symbol.
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 *       etc...
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 *
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 *
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 * NOTE 1 
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 *      Some operations and constants can have multiple data types. For example,
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 *        1 AND 0
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 *      may be either a BOOL, BYTE, WORD or LWORD.
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 *
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 *      The same happens with 
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 *        1 + 2
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 *      which may be signed (e.g. INT) or unsigned (UINT)
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 *
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 *      For the above reason, instead of storing a single constant value, we actually store 4:
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 *        - bool
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 *        - uint64
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 *        -  int64
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 *        - real64
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 *
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 *      Additionally, since the result of an operation may result in an overflow, we actually
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 *      store the result inside a struct (defined in absyntax.hh)
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 *
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 *             ** During stage 3 (semantic analysis/checking) we will be doing constant folding.
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 *              * That algorithm will anotate the abstract syntax tree with the result of operations
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 *              * on literals (i.e. 44 + 55 will store the result 99).
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 *              * Since the same source code (e.g. 1 + 0) may actually be a BOOL or an ANY_INT,
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 *              * or an ANY_BIT, we need to handle all possibilities, and determine the result of the
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 *              * operation assuming each type.
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 *              * For this reason, we have one entry for each possible type, with some expressions
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 *              * having more than one entry filled in!
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 *              **
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 *             typedef enum { cs_undefined,   // not defined --> const_value is not valid!
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 *                            cs_const_value, // const value is valid
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 *                            cs_overflow     // result produced overflow or underflow --> const_value is not valid!
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 *                          } const_status_t;
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 *    
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 *             typedef struct {
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 *                 const_status_t status;
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 *                 real64_t       value; 
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 *             } const_value_real64_t;
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 *             const_value_real64_t *const_value_real64; // when NULL --> UNDEFINED
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 *             
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 *             typedef struct {
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 *                 const_status_t status;
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 *                 int64_t        value; 
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 *             } const_value_int64_t;
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 *             const_value_int64_t *const_value_int64; // when NULL --> UNDEFINED
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 *             
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 *             typedef struct {
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 *                 const_status_t status;
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 *                 uint64_t       value; 
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 *             } const_value_uint64_t;
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 *             const_value_uint64_t *const_value_uint64; // when NULL --> UNDEFINED
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 *             
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 *             typedef struct {
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 *                 const_status_t status;
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 *                 bool           value; 
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 *             } const_value_bool_t;
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 *             const_value_bool_t *const_value_bool; // when NULL --> UNDEFINED
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 *
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 *
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 *
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 * NOTE 2 
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 *    This file does not print out any error messages!
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 *    We cannot really print out error messages when we find an overflow. Since each operation
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 *    (symbol in the abstract syntax tree for that operation) will have up to 4 constant results,
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 *    it may happen that some of them overflow, while other do not.
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 *    We must wait for data type checking to determine the exact data type of each expression
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 *    before we can decide whether or not we should print out an overflow error message.
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 *
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 *    For this reason, this visitor merely annotates the abstract syntax tree, and leaves the
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 *    actually printing of errors for the print_datatype_errors_c class!
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 *
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 * NOTE 3
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 *    Constant Folding class is extended with a implementation constant propagation algorithm
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 *    by Mario de Sousa.
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 *    Main idea is not to implement a general constant propagation algorithm but to reinterpret it
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 *    for visitor classes.
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 *    We declared a hash map, it contains a variables list linked with current constant values.
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 *    During expression evaluation we can retrieve a constant value to symbolic variables getting it from the map.
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 *    Also at join source points we use a meet semilattice rules to merge current values between a block
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 *    and adjacent block.
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 *
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 */
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#include "constant_folding.hh"
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#include <stdlib.h> /* required for malloc() */
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#include <string.h>  /* required for strlen() */
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// #include <stdlib.h>  /* required for atoi() */
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#include <errno.h>   /* required for errno */
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#include "../main.hh" // required for uint8_t, real_64_t, ..., and the macros NAN, INFINITY, INT8_MAX, REAL32_MAX, ... */
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#define FIRST_(symbol1, symbol2) (((symbol1)->first_order < (symbol2)->first_order)   ? (symbol1) : (symbol2))
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#define  LAST_(symbol1, symbol2) (((symbol1)->last_order  > (symbol2)->last_order)    ? (symbol1) : (symbol2))
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#define STAGE3_ERROR(error_level, symbol1, symbol2, ...) {                                                                  \
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  if (current_display_error_level >= error_level) {                                                                         \
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    fprintf(stderr, "%s:%d-%d..%d-%d: error: ",                                                                             \
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            FIRST_(symbol1,symbol2)->first_file, FIRST_(symbol1,symbol2)->first_line, FIRST_(symbol1,symbol2)->first_column,\
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                                                 LAST_(symbol1,symbol2) ->last_line,  LAST_(symbol1,symbol2) ->last_column);\
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    fprintf(stderr, __VA_ARGS__);                                                                                           \
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    fprintf(stderr, "\n");                                                                                                  \
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    error_count++;                                                                                                     \
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  }                                                                                                                         \
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}
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#define STAGE3_WARNING(symbol1, symbol2, ...) {                                                                             \
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    fprintf(stderr, "%s:%d-%d..%d-%d: warning: ",                                                                           \
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            FIRST_(symbol1,symbol2)->first_file, FIRST_(symbol1,symbol2)->first_line, FIRST_(symbol1,symbol2)->first_column,\
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                                                 LAST_(symbol1,symbol2) ->last_line,  LAST_(symbol1,symbol2) ->last_column);\
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    fprintf(stderr, __VA_ARGS__);                                                                                           \
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    fprintf(stderr, "\n");                                                                                                  \
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    warning_found = true;                                                                                                   \
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}
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#define SET_CVALUE(dtype, symbol, new_value)  ((symbol)->const_value._##dtype.set(new_value))
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#define GET_CVALUE(dtype, symbol)             ((symbol)->const_value._##dtype.get())
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#define SET_OVFLOW(dtype, symbol)             ((symbol)->const_value._##dtype.set_overflow())
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#define SET_NONCONST(dtype, symbol)           ((symbol)->const_value._##dtype.set_nonconst())
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#define VALID_CVALUE(dtype, symbol)           ((symbol)->const_value._##dtype.is_valid())
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#define IS_OVFLOW(dtype, symbol)              ((symbol)->const_value._##dtype.is_overflow())
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#define IS_NONCONST(dtype, symbol)            ((symbol)->const_value._##dtype.is_nonconst())
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#define ISZERO_CVALUE(dtype, symbol)          ((symbol)->const_value._##dtype.is_zero())
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#define ISEQUAL_CVALUE(dtype, symbol1, symbol2) \
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	(VALID_CVALUE(dtype, symbol1) && VALID_CVALUE(dtype, symbol2) && (GET_CVALUE(dtype, symbol1) == GET_CVALUE(dtype, symbol2))) 
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#define DO_BINARY_OPER(oper_type, operation, res_type, operand1, operand2) {                                              \
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	if      (VALID_CVALUE(oper_type, operand1) && VALID_CVALUE(oper_type, operand2))                                  \
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		{SET_CVALUE(res_type, symbol, GET_CVALUE(oper_type, operand1) operation GET_CVALUE(oper_type, operand2));}\
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	else if (IS_OVFLOW   (oper_type, operand1) || IS_OVFLOW   (oper_type, operand2))                                  \
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		{SET_OVFLOW(res_type, symbol);}  /* does it really make sense to set OVFLOW when restype is boolean??  */ \
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	else if (IS_NONCONST (oper_type, operand1) || IS_NONCONST (oper_type, operand2))                                  \
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		{SET_NONCONST(res_type, symbol);}                                                                         \
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}
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#define DO_UNARY_OPER(dtype, operation, operand) {                                                                        \
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	if      (VALID_CVALUE(dtype, operand))                                                                            \
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		{SET_CVALUE(dtype, symbol, operation GET_CVALUE(dtype, operand));}                                        \
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	else if (IS_OVFLOW   (dtype, operand))                                                                            \
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		{SET_OVFLOW(dtype, symbol);}                                                                              \
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	else if (IS_NONCONST (dtype, operand))                                                                            \
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		{SET_NONCONST(dtype, symbol);}                                                                            \
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}
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/* Constant Propagation: Rules for Meet from "Cooper K., Torczon L. - Engineering a Compiler, Second Edition - 2011"
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 * at 9.3 Static Single-Assignment Form  page 517
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 * - any * undefined = any
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 * - any * non_const = non_const
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 * - constant * constant = constant  (if equal)
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 * - constant * constant = non_const (if not equal)
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 */
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#define COMPUTE_MEET_SEMILATTICE(dtype, c1, c2, resValue) {\
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		if (( c1._##dtype.get()  != c2._##dtype.get() && c2._##dtype.is_valid() && c1._##dtype.is_valid()) ||\
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		    ( c1._##dtype.is_nonconst() && c2._##dtype.is_valid() ) ||\
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		    ( c2._##dtype.is_nonconst() && c1._##dtype.is_valid() )) {\
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			resValue._##dtype.set_nonconst();\
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		} else {\
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			resValue._##dtype.set(c1._##dtype.get());\
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		}\
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}
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/***********************************************************************/
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/***********************************************************************/
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/***********************************************************************/
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/***            convert string to numerical value                    ***/
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/***********************************************************************/
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/***********************************************************************/
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/***********************************************************************/
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  /* To allow the compiler to be portable, we cannot assume that int64_t is mapped onto long long int,
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   * so we cannot call strtoll() and strtoull() in extract_int64() and extract_uint64().
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   *
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   * So, we create our own strtouint64() and strtoint64() functions.
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   * (We actually call them matiec_strtoint64() so they will not clash with any function
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   *  that may be added to the standard library in the future).
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   * We actually create several of each, and let the compiler choose which is the correct one,
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   * by having it resolve the call to the overloaded function. For the C++ compiler to be able
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   * to resolve this ambiguity, we need to add a dummy parameter to each function!
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   *
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   * TODO: support platforms (where the compiler will run) in which int64_t is mapped onto int !!
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   *       Is this really needed?
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   *       Currently, when trying to compile matiec on sych a platform, the C++ compiler will not
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   *       find any apropriate matiec_strtoint64() to call, so matiec will not be able to be compiled.
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   *       If you need this, you are welcome to fix it yourself...
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   */
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static  int64_t matiec_strtoint64 (         long      int *dummy, const char *nptr, char **endptr, int base) {return strtol  (nptr, endptr, base);}
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static  int64_t matiec_strtoint64 (         long long int *dummy, const char *nptr, char **endptr, int base) {return strtoll (nptr, endptr, base);}
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static uint64_t matiec_strtouint64(unsigned long      int *dummy, const char *nptr, char **endptr, int base) {return strtoul (nptr, endptr, base);}
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static uint64_t matiec_strtouint64(unsigned long long int *dummy, const char *nptr, char **endptr, int base) {return strtoull(nptr, endptr, base);}
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/* extract the value of an integer from an integer_c object !! */
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/* NOTE: it must ignore underscores! */
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/* NOTE: To follow the basic structure used throughout the compiler's code, we should really be
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 * writing this as a visitor_c (and do away with the dynamic casts!), but since we only have 3 distinct 
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 * symbol class types to handle, it is probably easier to read if we write it as a standard function... 
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 */
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int64_t extract_int64_value(symbol_c *sym, bool *overflow) {
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  int64_t      ret;
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  std::string  str = "";
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  char        *endptr;
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  const char  *value = NULL;
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  int          base;
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  integer_c         *integer;
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  hex_integer_c     *hex_integer;
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  octal_integer_c   *octal_integer;
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  binary_integer_c  *binary_integer;
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   if       ((integer        = dynamic_cast<integer_c *>(sym))        != NULL) {value = integer       ->value + 0; base = 10;}
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   else  if ((hex_integer    = dynamic_cast<hex_integer_c *>(sym))    != NULL) {value = hex_integer   ->value + 3; base = 16;}
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   else  if ((octal_integer  = dynamic_cast<octal_integer_c *>(sym))  != NULL) {value = octal_integer ->value + 2; base =  8;}
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   else  if ((binary_integer = dynamic_cast<binary_integer_c *>(sym)) != NULL) {value = binary_integer->value + 2; base =  2;}
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   else  ERROR;
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  for(unsigned int i = 0; i < strlen(value); i++)
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    if (value[i] != '_')  str += value[i];
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  errno = 0; // since strtoXX() may legally return 0, we must set errno to 0 to detect errors correctly!
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  ret = matiec_strtoint64((int64_t *)NULL, str.c_str(), &endptr, base);
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  if (overflow != NULL)
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    *overflow = (errno == ERANGE);
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  if (((errno != 0) && (errno != ERANGE)) || (*endptr != '\0'))
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    ERROR;
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  return ret;
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}
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601
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uint64_t extract_uint64_value(symbol_c *sym, bool *overflow) {
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  uint64_t     ret;
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  std::string  str = "";
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  char        *endptr;
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  const char  *value = NULL;
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  int          base;
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  integer_c         *integer;
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  hex_integer_c     *hex_integer;
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  octal_integer_c   *octal_integer;
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  binary_integer_c  *binary_integer;
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   if       ((integer        = dynamic_cast<integer_c *>(sym))        != NULL) {value = integer       ->value + 0; base = 10;}
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   else  if ((hex_integer    = dynamic_cast<hex_integer_c *>(sym))    != NULL) {value = hex_integer   ->value + 3; base = 16;}
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   else  if ((octal_integer  = dynamic_cast<octal_integer_c *>(sym))  != NULL) {value = octal_integer ->value + 2; base =  8;}
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   else  if ((binary_integer = dynamic_cast<binary_integer_c *>(sym)) != NULL) {value = binary_integer->value + 2; base =  2;}
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   else  ERROR;
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  for(unsigned int i = 0; i < strlen(value); i++)
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    if (value[i] != '_')  str += value[i];
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  errno = 0; // since strtoXX() may legally return 0, we must set errno to 0 to detect errors correctly!
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  ret = matiec_strtouint64((uint64_t *)NULL, str.c_str(), &endptr, base);
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  if (overflow != NULL)
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    *overflow = (errno == ERANGE);
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  if (((errno != 0) && (errno != ERANGE)) || (*endptr != '\0'))
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    ERROR;
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  return ret;
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}
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/* extract the value of a real from an real_c object !! */
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/* NOTE: it must ignore underscores! */
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/* From iec_bison.yy
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 *  real:
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 *   real_token		{$$ = new real_c($1, locloc(@$));}
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 * | fixed_point_token	{$$ = new real_c($1, locloc(@$));}
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 *
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 * From iec_flex.ll
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 * {real}			{yylval.ID=strdup(yytext); return real_token;}
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 * {fixed_point}		{yylval.ID=strdup(yytext); return fixed_point_token;}
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 *
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 * real		{integer}\.{integer}{exponent}
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 * fixed_point		{integer}\.{integer}
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 * exponent        [Ee]([+-]?){integer}
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   358
 * integer         {digit}((_?{digit})*)
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   359
 */
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   360
real64_t extract_real_value(symbol_c *sym, bool *overflow) {
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   361
  std::string str = "";
600
f5d4e9f91513 determine const value of hex, octal and bin literals correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 596
diff changeset
   362
  real_c *real_sym;
633
73b56dc69e61 Fix bug with task interval using fixed_point value for duration items
Laurent Bessard
parents: 621
diff changeset
   363
  fixed_point_c *fixed_point_sym;
600
f5d4e9f91513 determine const value of hex, octal and bin literals correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 596
diff changeset
   364
  char   *endptr;
596
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   365
  real64_t ret;
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   366
633
73b56dc69e61 Fix bug with task interval using fixed_point value for duration items
Laurent Bessard
parents: 621
diff changeset
   367
  if ((real_sym = dynamic_cast<real_c *>(sym)) != NULL) {
73b56dc69e61 Fix bug with task interval using fixed_point value for duration items
Laurent Bessard
parents: 621
diff changeset
   368
	for(unsigned int i = 0; i < strlen(real_sym->value); i++)
73b56dc69e61 Fix bug with task interval using fixed_point value for duration items
Laurent Bessard
parents: 621
diff changeset
   369
      if (real_sym->value[i] != '_') str += real_sym->value[i];
73b56dc69e61 Fix bug with task interval using fixed_point value for duration items
Laurent Bessard
parents: 621
diff changeset
   370
  }
73b56dc69e61 Fix bug with task interval using fixed_point value for duration items
Laurent Bessard
parents: 621
diff changeset
   371
  else if ((fixed_point_sym = dynamic_cast<fixed_point_c *>(sym)) != NULL) {
73b56dc69e61 Fix bug with task interval using fixed_point value for duration items
Laurent Bessard
parents: 621
diff changeset
   372
    for(unsigned int i = 0; i < strlen(fixed_point_sym->value); i++)
73b56dc69e61 Fix bug with task interval using fixed_point value for duration items
Laurent Bessard
parents: 621
diff changeset
   373
      if (fixed_point_sym->value[i] != '_') str += fixed_point_sym->value[i];
73b56dc69e61 Fix bug with task interval using fixed_point value for duration items
Laurent Bessard
parents: 621
diff changeset
   374
  }
73b56dc69e61 Fix bug with task interval using fixed_point value for duration items
Laurent Bessard
parents: 621
diff changeset
   375
  else ERROR;
596
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   376
    
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   377
  errno = 0; // since strtoXX() may legally return 0, we must set errno to 0 to detect errors correctly!
890
499486ece119 Fix compilation error on platforms where real64_t is mapped onto 'long double'
mjsousa
parents: 792
diff changeset
   378
  #if    (real64_tX  == float)
600
f5d4e9f91513 determine const value of hex, octal and bin literals correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 596
diff changeset
   379
    ret = strtof(str.c_str(),  &endptr);
890
499486ece119 Fix compilation error on platforms where real64_t is mapped onto 'long double'
mjsousa
parents: 792
diff changeset
   380
  #elif  (real64_tX  == double)
600
f5d4e9f91513 determine const value of hex, octal and bin literals correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 596
diff changeset
   381
    ret = strtod(str.c_str(),  &endptr);
890
499486ece119 Fix compilation error on platforms where real64_t is mapped onto 'long double'
mjsousa
parents: 792
diff changeset
   382
  #elif  (real64_tX  == long_double)
600
f5d4e9f91513 determine const value of hex, octal and bin literals correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 596
diff changeset
   383
    ret = strtold(str.c_str(), &endptr);
596
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   384
  #else 
890
499486ece119 Fix compilation error on platforms where real64_t is mapped onto 'long double'
mjsousa
parents: 792
diff changeset
   385
    #error Could not determine which data type is being used for real64_t (defined in main.hh). Aborting!
596
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   386
  #endif
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   387
  if (overflow != NULL)
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   388
    *overflow = (errno == ERANGE);
600
f5d4e9f91513 determine const value of hex, octal and bin literals correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 596
diff changeset
   389
  if (((errno != 0) && (errno != ERANGE)) || (*endptr != '\0'))
596
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   390
    ERROR;
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   391
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   392
  return ret;
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   393
}
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   394
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   395
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   396
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   397
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   398
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   399
/***********************************************************************/
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   400
/***********************************************************************/
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   401
/***********************************************************************/
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   402
/***        Functions to check for overflow situation                ***/
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   403
/***********************************************************************/
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   404
/***********************************************************************/
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   405
/***********************************************************************/
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   406
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   407
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   408
/* NOTE:
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   409
 *   Most of the conditions to detect overflows on signed and unsigned integer operations were adapted from
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   410
 *   https://www.securecoding.cert.org/confluence/display/seccode/INT32-C.+Ensure+that+operations+on+signed+integers+do+not+result+in+overflow?showComments=false
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   411
 *   https://www.securecoding.cert.org/confluence/display/seccode/INT30-C.+Ensure+that+unsigned+integer+operations+do+not+wrap
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   412
 */
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   413
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   414
/* NOTE: If at all possible, all overflow tests are done by pre-condition tests, i.e. tests that 
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   415
 *       can be run _before_ the operation is executed, and therefore without accessing the result!
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   416
 *
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   417
 *       The exception is for real/floating point values, that simply test if the result is NaN (not a number).
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   418
 */
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   419
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   420
/* res = a + b */
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   421
static void CHECK_OVERFLOW_uint64_SUM(symbol_c *res, symbol_c *a, symbol_c *b) {
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   422
	if (!VALID_CVALUE(uint64, res))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   423
		return;
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   424
	/* Test by post-condition: If sum is smaller than either operand => overflow! */
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   425
	// if (GET_CVALUE(uint64, res) < GET_CVALUE(uint64, a))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   426
	/* Test by pre-condition: If (UINT64_MAX - a) < b => overflow! */
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   427
	if ((UINT64_MAX - GET_CVALUE(uint64, a)) < GET_CVALUE(uint64, b))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   428
		SET_OVFLOW(uint64, res);
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   429
}
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   430
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   431
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   432
/* res = a - b */
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   433
static void CHECK_OVERFLOW_uint64_SUB(symbol_c *res, symbol_c *a, symbol_c *b) {
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   434
	if (!VALID_CVALUE(uint64, res))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   435
		return;
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   436
	/* Test by post-condition: If diference is larger than a => overflow! */
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   437
	// if (GET_CVALUE(uint64, res) > GET_CVALUE(uint64, a))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   438
	/* Test by pre-condition: if b > a => overflow! */
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   439
	if (GET_CVALUE(uint64, b) > GET_CVALUE(uint64, a))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   440
		SET_OVFLOW(uint64, res);
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   441
}
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   442
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   443
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   444
/* res = a * b */
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   445
static void CHECK_OVERFLOW_uint64_MUL(symbol_c *res, symbol_c *a, symbol_c *b) {
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   446
	if (!VALID_CVALUE(uint64, res))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   447
		return;
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   448
	/* Test by pre-condition: If (UINT64_MAX / a) < b => overflow! */
786
c370918ca7fb Fix divide by 0 bug.
Mario de Sousa <msousa@fe.up.pt>
parents: 783
diff changeset
   449
	if (0 == GET_CVALUE(uint64, a))
c370918ca7fb Fix divide by 0 bug.
Mario de Sousa <msousa@fe.up.pt>
parents: 783
diff changeset
   450
		return; // multiplying by 0 will always result in 0, a valid result!	  
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   451
	if ((UINT64_MAX / GET_CVALUE(uint64, a)) < GET_CVALUE(uint64, b))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   452
		SET_OVFLOW(uint64, res);
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   453
}
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   454
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   455
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   456
/* res = a / b */
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   457
static void CHECK_OVERFLOW_uint64_DIV(symbol_c *res, symbol_c *a, symbol_c *b) {
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   458
	if (!VALID_CVALUE(uint64, res))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   459
		return;
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   460
	if (GET_CVALUE(uint64, b) == 0) /* division by zero! */
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   461
		SET_OVFLOW(uint64, res);
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   462
}
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   463
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   464
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   465
/* res = a MOD b */
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   466
static void CHECK_OVERFLOW_uint64_MOD(symbol_c *res, symbol_c *a, symbol_c *b) {
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   467
	if (!VALID_CVALUE(uint64, res))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   468
		return;
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   469
	/* no overflow condition exists, including division by zero, which IEC 61131-3 considers legal for MOD operation! */
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   470
	if (false) 
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   471
		SET_OVFLOW(uint64, res);
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   472
}
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   473
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   474
643
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   475
/* res = - a */
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   476
static void CHECK_OVERFLOW_uint64_NEG(symbol_c *res, symbol_c *a) {
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   477
	/* The only legal operation is res = -0, everything else is an overflow! */
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   478
	if (VALID_CVALUE(uint64, a) && (GET_CVALUE(uint64, a) != 0))
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   479
		SET_OVFLOW(uint64, res);
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   480
}
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   481
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   482
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   483
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   484
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   485
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   486
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   487
/* res = a + b */
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   488
static void CHECK_OVERFLOW_int64_SUM(symbol_c *res, symbol_c *a_ptr, symbol_c *b_ptr) {
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   489
	if (!VALID_CVALUE(int64, res))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   490
		return;
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   491
	int64_t a = GET_CVALUE(int64, a_ptr);
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   492
	int64_t b = GET_CVALUE(int64, b_ptr);
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   493
	/* The following test is valid no matter what representation is being used (e.g. two's complement, etc...) */
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   494
	if (((b > 0) && (a > (INT64_MAX - b)))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   495
	 || ((b < 0) && (a < (INT64_MIN - b))))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   496
		SET_OVFLOW(int64, res);
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   497
}
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   498
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   499
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   500
/* res = a - b */
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   501
static void CHECK_OVERFLOW_int64_SUB(symbol_c *res, symbol_c *a_ptr, symbol_c *b_ptr) {
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   502
	if (!VALID_CVALUE(int64, res))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   503
		return;
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   504
	int64_t a = GET_CVALUE(int64, a_ptr);
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   505
	int64_t b = GET_CVALUE(int64, b_ptr);
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   506
	/* The following test is valid no matter what representation is being used (e.g. two's complement, etc...) */
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   507
	if (((b > 0) && (a < (INT64_MIN + b)))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   508
	 || ((b < 0) && (a > (INT64_MAX + b))))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   509
		SET_OVFLOW(int64, res);
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   510
}
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   511
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   512
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   513
/* res = a * b */
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   514
static void CHECK_OVERFLOW_int64_MUL(symbol_c *res, symbol_c *a_ptr, symbol_c *b_ptr) {
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   515
	if (!VALID_CVALUE(int64, res))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   516
		return;
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   517
	int64_t a = GET_CVALUE(int64, a_ptr);
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   518
	int64_t b = GET_CVALUE(int64, b_ptr);
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   519
	if (   ( (a > 0) &&  (b > 0) &&             (a > (INT64_MAX / b))) 
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   520
	    || ( (a > 0) && !(b > 0) &&             (b < (INT64_MIN / a))) 
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   521
	    || (!(a > 0) &&  (b > 0) &&             (a < (INT64_MIN / b))) 
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   522
	    || (!(a > 0) && !(b > 0) && (a != 0) && (b < (INT64_MAX / a))))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   523
		SET_OVFLOW(int64, res);
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   524
}
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   525
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   526
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   527
/* res = a / b */
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   528
static void CHECK_OVERFLOW_int64_DIV(symbol_c *res, symbol_c *a_ptr, symbol_c *b_ptr) {
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   529
	if (!VALID_CVALUE(int64, res))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   530
		return;
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   531
	int64_t a = GET_CVALUE(int64, a_ptr);
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   532
	int64_t b = GET_CVALUE(int64, b_ptr);
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   533
	if ((b == 0) || ((a == INT64_MIN) && (b == -1)))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   534
		SET_OVFLOW(int64, res);
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   535
}
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   536
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   537
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   538
/* res = a MOD b */
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   539
static void CHECK_OVERFLOW_int64_MOD(symbol_c *res, symbol_c *a_ptr, symbol_c *b_ptr) {
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   540
	if (!VALID_CVALUE(int64, res))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   541
		return;
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   542
	int64_t a = GET_CVALUE(int64, a_ptr);
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   543
	int64_t b = GET_CVALUE(int64, b_ptr);
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   544
	/* IEC 61131-3 standard says IN1 MOD IN2 must be equivalent to
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   545
	 *  IF (IN2 = 0) THEN OUT:=0 ; ELSE OUT:=IN1 - (IN1/IN2)*IN2 ; END_IF
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   546
	 *
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   547
	 * Note that, when IN1 = INT64_MIN, and IN2 = -1, an overflow occurs in the division,
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   548
	 * so although the MOD operation should be OK, acording to the above definition, we actually have an overflow!!
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   549
	 *
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   550
	 * On the other hand, division by 0 is OK!!
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   551
	 */
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   552
	if ((a == INT64_MIN) && (b == -1))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   553
		SET_OVFLOW(int64, res);
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   554
}
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   555
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   556
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   557
/* res = - a */
643
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   558
static void CHECK_OVERFLOW_int64_NEG(symbol_c *res, symbol_c *a) {
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   559
	if (!VALID_CVALUE(int64, res))
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   560
		return;
643
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   561
	if (GET_CVALUE(int64, a) == INT64_MIN)
574
d291a942899b Fix remaining overflow checks.
Mario de Sousa <msousa@fe.up.pt>
parents: 573
diff changeset
   562
		SET_OVFLOW(int64, res);
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   563
}
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   564
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   565
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   566
643
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   567
579
983a3b743085 Fix 'overflow' detection for real64.
Mario de Sousa <msousa@fe.up.pt>
parents: 578
diff changeset
   568
static void CHECK_OVERFLOW_real64(symbol_c *res_ptr) {
983a3b743085 Fix 'overflow' detection for real64.
Mario de Sousa <msousa@fe.up.pt>
parents: 578
diff changeset
   569
	if (!VALID_CVALUE(real64, res_ptr))
983a3b743085 Fix 'overflow' detection for real64.
Mario de Sousa <msousa@fe.up.pt>
parents: 578
diff changeset
   570
		return;
983a3b743085 Fix 'overflow' detection for real64.
Mario de Sousa <msousa@fe.up.pt>
parents: 578
diff changeset
   571
	real64_t res = GET_CVALUE(real64, res_ptr);
983a3b743085 Fix 'overflow' detection for real64.
Mario de Sousa <msousa@fe.up.pt>
parents: 578
diff changeset
   572
	/* NaN => underflow, overflow, number is a higher precision format, is a complex number (IEEE standard) */
983a3b743085 Fix 'overflow' detection for real64.
Mario de Sousa <msousa@fe.up.pt>
parents: 578
diff changeset
   573
	/* The IEC 61131-3 clearly states in section '2.5.1.5.2 Numerical functions':
983a3b743085 Fix 'overflow' detection for real64.
Mario de Sousa <msousa@fe.up.pt>
parents: 578
diff changeset
   574
	 * "It is an error if the result of evaluation of one of these [numerical] functions exceeds the range of values
983a3b743085 Fix 'overflow' detection for real64.
Mario de Sousa <msousa@fe.up.pt>
parents: 578
diff changeset
   575
	 *  specified for the data type of the function output, or if division by zero is attempted."
983a3b743085 Fix 'overflow' detection for real64.
Mario de Sousa <msousa@fe.up.pt>
parents: 578
diff changeset
   576
	 * For this reason, any operation that has as a result a positive or negative inifinity, is also an error!
983a3b743085 Fix 'overflow' detection for real64.
Mario de Sousa <msousa@fe.up.pt>
parents: 578
diff changeset
   577
	 */
607
be9ba3531afb cleaning up code. Changing HUGE_VAL to INFINITY.
Mario de Sousa <msousa@fe.up.pt>
parents: 604
diff changeset
   578
	if ((isnan(res)) || (res == INFINITY) || (res == -INFINITY))
579
983a3b743085 Fix 'overflow' detection for real64.
Mario de Sousa <msousa@fe.up.pt>
parents: 578
diff changeset
   579
		SET_OVFLOW(real64, res_ptr);
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   580
}
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   581
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   582
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   583
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   584
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   585
/***********************************************************************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   586
/***********************************************************************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   587
/***********************************************************************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   588
/***        Functions to execute operations on the const values      ***/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   589
/***********************************************************************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   590
/***********************************************************************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   591
/***********************************************************************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   592
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   593
/* static void *handle_cmp(symbol_c *symbol, symbol_c *oper1, symbol_c *oper2, OPERATION) */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   594
#define handle_cmp(symbol, oper1, oper2, operation) {               \
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   595
	if ((NULL == oper1) || (NULL == oper2)) return NULL;        \
643
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   596
	DO_BINARY_OPER(  bool, operation, bool, oper1, oper2);     \
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   597
	DO_BINARY_OPER(uint64, operation, bool, oper1, oper2);     \
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   598
	DO_BINARY_OPER( int64, operation, bool, oper1, oper2);     \
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   599
	DO_BINARY_OPER(real64, operation, bool, oper1, oper2);     \
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   600
	return NULL;                                                \
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   601
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   602
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   603
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   604
/* NOTE: the MOVE standard function is equivalent to the ':=' in ST syntax */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   605
static void *handle_move(symbol_c *to, symbol_c *from) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   606
	if (NULL == from) return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   607
	to->const_value = from->const_value;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   608
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   609
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   610
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   611
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   612
/* unary negation (multiply by -1) */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   613
static void *handle_neg(symbol_c *symbol, symbol_c *oper) {
643
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   614
	if (NULL == oper) return NULL;
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   615
	/* NOTE: The oper may never be an integer/real literal, '-1' and '-2.2' are stored as an neg_integer_c/neg_real_c instead.
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   616
	 *       Because of this, we MUST NOT handle the INT_MIN special situation that is handled in neg_integer_c visitor!
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   617
	 *
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   618
	 *       VAR v1, v2, v3 : UINT; END_VAR;
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   619
	 *       v1 =  9223372036854775808 ; (* |INT64_MIN| == -INT64_MIN *)   <------ LEGAL
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   620
	 *       v2 =  -(-v1);                                                 <------ ILLEGAL (since it -v1 is overflow!)
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   621
	 *       v2 =  -(-9223372036854775808 );                               <------ MUST also be ILLEGAL 
640
ffa02cf2b335 Add some comments.
Mario de Sousa <msousa@fe.up.pt>
parents: 621
diff changeset
   622
	 */
643
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   623
	DO_UNARY_OPER(uint64, -, oper);	CHECK_OVERFLOW_uint64_NEG(symbol, oper);  /* handle the uint_v := -0 situation! */
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   624
	DO_UNARY_OPER( int64, -, oper);	CHECK_OVERFLOW_int64_NEG (symbol, oper);
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   625
	DO_UNARY_OPER(real64, -, oper);	CHECK_OVERFLOW_real64(symbol);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   626
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   627
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   628
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   629
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   630
/* unary boolean negation (NOT) */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   631
static void *handle_not(symbol_c *symbol, symbol_c *oper) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   632
	if (NULL == oper) return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   633
	DO_UNARY_OPER(  bool, !, oper);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   634
	DO_UNARY_OPER(uint64, ~, oper);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   635
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   636
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   637
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   638
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   639
static void *handle_or (symbol_c *symbol, symbol_c *oper1, symbol_c *oper2) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   640
	if ((NULL == oper1) || (NULL == oper2)) return NULL;
643
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   641
	DO_BINARY_OPER(  bool, ||, bool  , oper1, oper2);
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   642
	DO_BINARY_OPER(uint64, | , uint64, oper1, oper2);
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   643
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   644
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   645
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   646
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   647
static void *handle_xor(symbol_c *symbol, symbol_c *oper1, symbol_c *oper2) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   648
	if ((NULL == oper1) || (NULL == oper2)) return NULL;
643
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   649
	DO_BINARY_OPER(  bool, ^, bool  , oper1, oper2);
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   650
	DO_BINARY_OPER(uint64, ^, uint64, oper1, oper2);
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   651
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   652
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   653
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   654
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   655
static void *handle_and(symbol_c *symbol, symbol_c *oper1, symbol_c *oper2) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   656
	if ((NULL == oper1) || (NULL == oper2)) return NULL;
643
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   657
	DO_BINARY_OPER(  bool, &&, bool, oper1, oper2);
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   658
	DO_BINARY_OPER(uint64, & , uint64, oper1, oper2);
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   659
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   660
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   661
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   662
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   663
static void *handle_add(symbol_c *symbol, symbol_c *oper1, symbol_c *oper2) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   664
	if ((NULL == oper1) || (NULL == oper2)) return NULL;
643
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   665
	DO_BINARY_OPER(uint64, +, uint64, oper1, oper2);   CHECK_OVERFLOW_uint64_SUM(symbol, oper1, oper2);
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   666
	DO_BINARY_OPER( int64, +,  int64, oper1, oper2);   CHECK_OVERFLOW_int64_SUM (symbol, oper1, oper2);
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   667
	DO_BINARY_OPER(real64, +, real64, oper1, oper2);   CHECK_OVERFLOW_real64    (symbol);
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   668
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   669
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   670
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   671
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   672
static void *handle_sub(symbol_c *symbol, symbol_c *oper1, symbol_c *oper2) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   673
	if ((NULL == oper1) || (NULL == oper2)) return NULL;
643
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   674
	DO_BINARY_OPER(uint64, -, uint64, oper1, oper2);   CHECK_OVERFLOW_uint64_SUB(symbol, oper1, oper2);
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   675
	DO_BINARY_OPER( int64, -,  int64, oper1, oper2);   CHECK_OVERFLOW_int64_SUB (symbol, oper1, oper2);
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   676
	DO_BINARY_OPER(real64, -, real64, oper1, oper2);   CHECK_OVERFLOW_real64    (symbol);
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   677
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   678
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   679
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   680
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   681
static void *handle_mul(symbol_c *symbol, symbol_c *oper1, symbol_c *oper2) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   682
	if ((NULL == oper1) || (NULL == oper2)) return NULL;
643
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   683
	DO_BINARY_OPER(uint64, *, uint64, oper1, oper2);   CHECK_OVERFLOW_uint64_MUL(symbol, oper1, oper2);
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   684
	DO_BINARY_OPER( int64, *,  int64, oper1, oper2);   CHECK_OVERFLOW_int64_MUL (symbol, oper1, oper2);
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   685
	DO_BINARY_OPER(real64, *, real64, oper1, oper2);   CHECK_OVERFLOW_real64    (symbol);
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   686
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   687
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   688
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   689
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   690
static void *handle_div(symbol_c *symbol, symbol_c *oper1, symbol_c *oper2) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   691
	if ((NULL == oper1) || (NULL == oper2)) return NULL;
643
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   692
	if (ISZERO_CVALUE(uint64, oper2))  {SET_OVFLOW(uint64, symbol);} else {DO_BINARY_OPER(uint64, /, uint64, oper1, oper2); CHECK_OVERFLOW_uint64_DIV(symbol, oper1, oper2);};
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   693
	if (ISZERO_CVALUE( int64, oper2))  {SET_OVFLOW( int64, symbol);} else {DO_BINARY_OPER( int64, /,  int64, oper1, oper2); CHECK_OVERFLOW_int64_DIV (symbol, oper1, oper2);};
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   694
	if (ISZERO_CVALUE(real64, oper2))  {SET_OVFLOW(real64, symbol);} else {DO_BINARY_OPER(real64, /, real64, oper1, oper2); CHECK_OVERFLOW_real64(symbol);};
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   695
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   696
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   697
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   698
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   699
static void *handle_mod(symbol_c *symbol, symbol_c *oper1, symbol_c *oper2) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   700
	if ((NULL == oper1) || (NULL == oper2)) return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   701
	/* IEC 61131-3 standard says IN1 MOD IN2 must be equivalent to
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   702
	 *  IF (IN2 = 0) THEN OUT:=0 ; ELSE OUT:=IN1 - (IN1/IN2)*IN2 ; END_IF
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   703
	 *
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   704
	 * Note that, when IN1 = INT64_MIN, and IN2 = -1, an overflow occurs in the division,
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   705
	 * so although the MOD operation should be OK, acording to the above definition, we actually have an overflow!!
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   706
	 */
643
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   707
	if (ISZERO_CVALUE(uint64, oper2))  {SET_CVALUE(uint64, symbol, 0);} else {DO_BINARY_OPER(uint64, %, uint64, oper1, oper2); CHECK_OVERFLOW_uint64_MOD(symbol, oper1, oper2);};
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   708
	if (ISZERO_CVALUE( int64, oper2))  {SET_CVALUE( int64, symbol, 0);} else {DO_BINARY_OPER( int64, %,  int64, oper1, oper2); CHECK_OVERFLOW_int64_MOD (symbol, oper1, oper2);};
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   709
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   710
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   711
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   712
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   713
static void *handle_pow(symbol_c *symbol, symbol_c *oper1, symbol_c *oper2) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   714
	/* NOTE: If the const_value in symbol->r_exp is within the limits of both int64 and uint64, then we do both operations.
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   715
	 *       That is OK, as the result should be identicial (we do create an unnecessary CVALUE variable, but who cares?).
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   716
	 *       If only one is valid, then that is the oper we will do!
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   717
	 */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   718
	if (VALID_CVALUE(real64, oper1) && VALID_CVALUE( int64, oper2))
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   719
		SET_CVALUE(real64, symbol, pow(GET_CVALUE(real64, oper1), GET_CVALUE( int64, oper2)));
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   720
	if (VALID_CVALUE(real64, oper1) && VALID_CVALUE(uint64, oper2))
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   721
		SET_CVALUE(real64, symbol, pow(GET_CVALUE(real64, oper1), GET_CVALUE(uint64, oper2)));
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   722
	CHECK_OVERFLOW_real64(symbol);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   723
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   724
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   725
969
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
   726
static constant_folding_c::map_values_t inner_left_join_values(constant_folding_c::map_values_t m1, constant_folding_c::map_values_t m2) {
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
   727
	constant_folding_c::map_values_t::const_iterator itr;
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
   728
	constant_folding_c::map_values_t ret;
788
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
   729
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
   730
	itr = m1.begin();
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
   731
	for ( ; itr != m1.end(); ++itr) {
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
   732
		std::string name = itr->first;
965
c9eeb67ba939 Small code re-organization of how const values are stored in symbol_c (can now be accessed through member functions, instead of macros)
mjsousa
parents: 964
diff changeset
   733
		const_value_c value;
788
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
   734
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
   735
		if (m2.count(name) > 0) {
965
c9eeb67ba939 Small code re-organization of how const values are stored in symbol_c (can now be accessed through member functions, instead of macros)
mjsousa
parents: 964
diff changeset
   736
			const_value_c c1 = itr->second;
c9eeb67ba939 Small code re-organization of how const values are stored in symbol_c (can now be accessed through member functions, instead of macros)
mjsousa
parents: 964
diff changeset
   737
			const_value_c c2 = m2[name];
788
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
   738
			COMPUTE_MEET_SEMILATTICE (real64, c1, c2, value);
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
   739
			COMPUTE_MEET_SEMILATTICE (uint64, c1, c2, value);
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
   740
			COMPUTE_MEET_SEMILATTICE ( int64, c1, c2, value);
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
   741
			COMPUTE_MEET_SEMILATTICE (  bool, c1, c2, value);
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
   742
		} else
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
   743
			value = m1[name];
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
   744
		ret[name] = value;
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
   745
	}
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
   746
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
   747
	return ret;
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
   748
}
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
   749
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   750
/***********************************************************************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   751
/***********************************************************************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   752
/***********************************************************************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   753
/***        Helper functions for handling IL instruction lists.      ***/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   754
/***********************************************************************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   755
/***********************************************************************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   756
/***********************************************************************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   757
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   758
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   759
/* If the cvalues of all the prev_il_intructions have the same VALID value, then set the local cvalue to that value, otherwise, set it to NONCONST! */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   760
#define intersect_prev_CVALUE_(dtype, symbol) {                                                                   \
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   761
	symbol->const_value._##dtype = symbol->prev_il_instruction[0]->const_value._##dtype;                      \
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   762
	for (unsigned int i = 1; i < symbol->prev_il_instruction.size(); i++) {                                   \
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   763
		if (!ISEQUAL_CVALUE(dtype, symbol, symbol->prev_il_instruction[i]))                               \
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   764
			{SET_NONCONST(dtype, symbol); break;}                                                     \
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   765
	}                                                                                                         \
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   766
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   767
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   768
static void intersect_prev_cvalues(il_instruction_c *symbol) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   769
	if (symbol->prev_il_instruction.empty())
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   770
		return;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   771
	intersect_prev_CVALUE_(real64, symbol);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   772
	intersect_prev_CVALUE_(uint64, symbol);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   773
	intersect_prev_CVALUE_( int64, symbol);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   774
	intersect_prev_CVALUE_(  bool, symbol);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   775
}
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   776
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   777
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   778
596
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   779
/***********************************************************************/
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   780
/***********************************************************************/
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   781
/***********************************************************************/
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   782
/***        The constant_folding_c                                   ***/
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   783
/***********************************************************************/
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   784
/***********************************************************************/
4efb11e44065 Add ERROR_MSG macro && move extract_XXX() functions to constant_folding.cc
Mario de Sousa <msousa@fe.up.pt>
parents: 592
diff changeset
   785
/***********************************************************************/
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   786
945
477393b00f95 Add support for relaxed datatype model for array datatypes.
mjsousa
parents: 890
diff changeset
   787
#if 0
477393b00f95 Add support for relaxed datatype model for array datatypes.
mjsousa
parents: 890
diff changeset
   788
// not currently needed, so comment it out!...
477393b00f95 Add support for relaxed datatype model for array datatypes.
mjsousa
parents: 890
diff changeset
   789
// returns true if both symbols have the same value in all the cvalues
477393b00f95 Add support for relaxed datatype model for array datatypes.
mjsousa
parents: 890
diff changeset
   790
bool constant_folding_c::is_equal_cvalue(symbol_c *symbol_1, symbol_c *symbol_2) {
477393b00f95 Add support for relaxed datatype model for array datatypes.
mjsousa
parents: 890
diff changeset
   791
	if (VALID_CVALUE  (real64, symbol_1) != VALID_CVALUE  (real64, symbol_2)) return false;
477393b00f95 Add support for relaxed datatype model for array datatypes.
mjsousa
parents: 890
diff changeset
   792
	if (VALID_CVALUE  (uint64, symbol_1) != VALID_CVALUE  (uint64, symbol_2)) return false;
477393b00f95 Add support for relaxed datatype model for array datatypes.
mjsousa
parents: 890
diff changeset
   793
	if (VALID_CVALUE  ( int64, symbol_1) != VALID_CVALUE  ( int64, symbol_2)) return false;
477393b00f95 Add support for relaxed datatype model for array datatypes.
mjsousa
parents: 890
diff changeset
   794
	if (VALID_CVALUE  (  bool, symbol_1) != VALID_CVALUE  (  bool, symbol_2)) return false;
477393b00f95 Add support for relaxed datatype model for array datatypes.
mjsousa
parents: 890
diff changeset
   795
	if (VALID_CVALUE  (real64, symbol_1) && !ISEQUAL_CVALUE(real64, symbol_1, symbol_2)) return false;
477393b00f95 Add support for relaxed datatype model for array datatypes.
mjsousa
parents: 890
diff changeset
   796
	if (VALID_CVALUE  (uint64, symbol_1) && !ISEQUAL_CVALUE(uint64, symbol_1, symbol_2)) return false;
477393b00f95 Add support for relaxed datatype model for array datatypes.
mjsousa
parents: 890
diff changeset
   797
	if (VALID_CVALUE  ( int64, symbol_1) && !ISEQUAL_CVALUE( int64, symbol_1, symbol_2)) return false;
477393b00f95 Add support for relaxed datatype model for array datatypes.
mjsousa
parents: 890
diff changeset
   798
	if (VALID_CVALUE  (  bool, symbol_1) && !ISEQUAL_CVALUE(  bool, symbol_1, symbol_2)) return false;
477393b00f95 Add support for relaxed datatype model for array datatypes.
mjsousa
parents: 890
diff changeset
   799
	return true;
477393b00f95 Add support for relaxed datatype model for array datatypes.
mjsousa
parents: 890
diff changeset
   800
}
477393b00f95 Add support for relaxed datatype model for array datatypes.
mjsousa
parents: 890
diff changeset
   801
#endif
572
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   802
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   803
c353bc67bf91 Correctly implement MOD operation and overflow checks (still missing uint * / MOD).
Mario de Sousa <msousa@fe.up.pt>
parents: 570
diff changeset
   804
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   805
constant_folding_c::constant_folding_c(symbol_c *symbol) {
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
   806
    fixed_init_value_ = false;
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
   807
    function_pou_ = false;
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   808
    error_count = 0;
568
5f79478142d7 make the compiler platform independent (i.e. no longer assume sizeof(double)==8).
Mario de Sousa <msousa@fe.up.pt>
parents: 567
diff changeset
   809
    warning_found = false;
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   810
    current_display_error_level = 0;
661
f537c3315f83 Minor changes needed to build with pedantic flag.
Manuele Conti <conti.ma@alice.it>
parents: 648
diff changeset
   811
    il_operand = NULL;
f537c3315f83 Minor changes needed to build with pedantic flag.
Manuele Conti <conti.ma@alice.it>
parents: 648
diff changeset
   812
    search_varfb_instance_type = NULL;
f537c3315f83 Minor changes needed to build with pedantic flag.
Manuele Conti <conti.ma@alice.it>
parents: 648
diff changeset
   813
    prev_il_instruction = NULL;
568
5f79478142d7 make the compiler platform independent (i.e. no longer assume sizeof(double)==8).
Mario de Sousa <msousa@fe.up.pt>
parents: 567
diff changeset
   814
    
5f79478142d7 make the compiler platform independent (i.e. no longer assume sizeof(double)==8).
Mario de Sousa <msousa@fe.up.pt>
parents: 567
diff changeset
   815
    /* check whether the platform on which the compiler is being run implements IEC 559 floating point data types. */
5f79478142d7 make the compiler platform independent (i.e. no longer assume sizeof(double)==8).
Mario de Sousa <msousa@fe.up.pt>
parents: 567
diff changeset
   816
    symbol_c null_symbol;
5f79478142d7 make the compiler platform independent (i.e. no longer assume sizeof(double)==8).
Mario de Sousa <msousa@fe.up.pt>
parents: 567
diff changeset
   817
    if (! (std::numeric_limits<real64_t>::is_iec559) )
579
983a3b743085 Fix 'overflow' detection for real64.
Mario de Sousa <msousa@fe.up.pt>
parents: 578
diff changeset
   818
        STAGE3_WARNING(&null_symbol, &null_symbol, "The platform running the compiler does not implement IEC 60559 floating point numbers. "
568
5f79478142d7 make the compiler platform independent (i.e. no longer assume sizeof(double)==8).
Mario de Sousa <msousa@fe.up.pt>
parents: 567
diff changeset
   819
                                                   "Any error and/or warning messages related to overflow/underflow of the result of operations on REAL/LREAL literals "
579
983a3b743085 Fix 'overflow' detection for real64.
Mario de Sousa <msousa@fe.up.pt>
parents: 578
diff changeset
   820
                                                   "(i.e. constant folding) may themselves be erroneous, although are most probably correct."
983a3b743085 Fix 'overflow' detection for real64.
Mario de Sousa <msousa@fe.up.pt>
parents: 578
diff changeset
   821
                                                   "However, more likely is the possible existance of overflow/underflow errors that are not detected.");
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   822
}
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   823
567
e5deeb6d4d2f create extract_real_value() in absyntax_utils. NOTE: overflows not yet handled!
Mario de Sousa <msousa@fe.up.pt>
parents: 566
diff changeset
   824
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   825
constant_folding_c::~constant_folding_c(void) {
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   826
}
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   827
567
e5deeb6d4d2f create extract_real_value() in absyntax_utils. NOTE: overflows not yet handled!
Mario de Sousa <msousa@fe.up.pt>
parents: 566
diff changeset
   828
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   829
int constant_folding_c::get_error_count() {
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   830
	return error_count;
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   831
}
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   832
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   833
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   834
/*********************/
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   835
/* B 1.2 - Constants */
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   836
/*********************/
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   837
/******************************/
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   838
/* B 1.2.1 - Numeric Literals */
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   839
/******************************/
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   840
void *constant_folding_c::visit(real_c *symbol) {
576
8368ec909825 Fix extract_real (thanks Manuele), and add check for overflow.
Mario de Sousa <msousa@fe.up.pt>
parents: 575
diff changeset
   841
	bool overflow;
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   842
	SET_CVALUE(real64, symbol, extract_real_value(symbol, &overflow));
576
8368ec909825 Fix extract_real (thanks Manuele), and add check for overflow.
Mario de Sousa <msousa@fe.up.pt>
parents: 575
diff changeset
   843
	if (overflow) SET_OVFLOW(real64, symbol);
567
e5deeb6d4d2f create extract_real_value() in absyntax_utils. NOTE: overflows not yet handled!
Mario de Sousa <msousa@fe.up.pt>
parents: 566
diff changeset
   844
	return NULL;
e5deeb6d4d2f create extract_real_value() in absyntax_utils. NOTE: overflows not yet handled!
Mario de Sousa <msousa@fe.up.pt>
parents: 566
diff changeset
   845
}
e5deeb6d4d2f create extract_real_value() in absyntax_utils. NOTE: overflows not yet handled!
Mario de Sousa <msousa@fe.up.pt>
parents: 566
diff changeset
   846
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   847
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   848
void *constant_folding_c::visit(integer_c *symbol) {
587
1ecf916cc397 Fix extract_integer_value.
Manuele Conti <conti.ma@alice.it>
parents: 579
diff changeset
   849
	bool overflow;
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   850
	SET_CVALUE( int64, symbol, extract_int64_value (symbol, &overflow));
588
3d72d09bd40f Add missing set overflow flag.
Manuele Conti <conti.ma@alice.it>
parents: 587
diff changeset
   851
	if (overflow) SET_OVFLOW(int64, symbol);
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   852
	SET_CVALUE(uint64, symbol, extract_uint64_value(symbol, &overflow));
588
3d72d09bd40f Add missing set overflow flag.
Manuele Conti <conti.ma@alice.it>
parents: 587
diff changeset
   853
	if (overflow) SET_OVFLOW(uint64, symbol);
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   854
	return NULL;
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   855
}
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   856
567
e5deeb6d4d2f create extract_real_value() in absyntax_utils. NOTE: overflows not yet handled!
Mario de Sousa <msousa@fe.up.pt>
parents: 566
diff changeset
   857
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   858
void *constant_folding_c::visit(neg_real_c *symbol) {
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   859
	symbol->exp->accept(*this);
643
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   860
	DO_UNARY_OPER(real64, -, symbol->exp); CHECK_OVERFLOW_real64(symbol);
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   861
	if (IS_OVFLOW(real64, symbol->exp)) SET_OVFLOW(real64, symbol);
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   862
	return NULL;
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   863
}
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   864
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   865
569
0d1ab9e78574 Add data structure for storing overflow of constant values.
Mario de Sousa <msousa@fe.up.pt>
parents: 568
diff changeset
   866
0d1ab9e78574 Add data structure for storing overflow of constant values.
Mario de Sousa <msousa@fe.up.pt>
parents: 568
diff changeset
   867
/* | '-' integer	{$$ = new neg_integer_c($2, locloc(@$));} */
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   868
void *constant_folding_c::visit(neg_integer_c *symbol) {
569
0d1ab9e78574 Add data structure for storing overflow of constant values.
Mario de Sousa <msousa@fe.up.pt>
parents: 568
diff changeset
   869
	symbol->exp->accept(*this);
643
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   870
	/* Note that due to syntax restrictions, the value of symbol->exp will always be positive. 
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   871
	 * However, the following code does not depend on that restriction.
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   872
	 */
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   873
	/* The remainder of the code (for example, data type checking) considers the neg_integer_c as a leaf of the
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   874
	 * abstract syntax tree, and therefore simply ignores the values of neg_integer_c->exp.
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   875
	 * For this reason only, and in only this situation, we must guarantee that any 'overflow' situation in 
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   876
	 * the cvalue of neg_integer_c->exp is also reflected back to this neg_integer_c symbol.
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   877
	 * For the rest of the code we do NOT do this, as it would gurantee that a single overflow deep inside
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   878
	 * an expression would imply that the expression itself would also be set to 'overflow' condition.
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   879
	 * This in turn would then have the compiler produce a whole load of error messages where they are not wanted!
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   880
	 */
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   881
	DO_UNARY_OPER(uint64, -, symbol->exp); CHECK_OVERFLOW_uint64_NEG(symbol, symbol->exp);  /* handle the uintv := -0 situation */
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   882
	if (IS_OVFLOW(uint64, symbol->exp)) SET_OVFLOW(uint64, symbol);
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   883
	DO_UNARY_OPER( int64, -, symbol->exp); CHECK_OVERFLOW_int64_NEG (symbol, symbol->exp);
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   884
	if (IS_OVFLOW( int64, symbol->exp)) SET_OVFLOW( int64, symbol);
590
649667749171 Add support for -INT64_MIN values in literals.
Mario de Sousa <msousa@fe.up.pt>
parents: 588
diff changeset
   885
	/* NOTE 1: INT64_MIN = -(INT64_MAX + 1)   ---> assuming two's complement representation!!!
649667749171 Add support for -INT64_MIN values in literals.
Mario de Sousa <msousa@fe.up.pt>
parents: 588
diff changeset
   886
	 * NOTE 2: if the user happens to want INT_MIN, that value will first be parsed as a positive integer, before being negated here.
649667749171 Add support for -INT64_MIN values in literals.
Mario de Sousa <msousa@fe.up.pt>
parents: 588
diff changeset
   887
	 * However, the positive value cannot be stored inside an int64! So, in this case, we will get the value from the uint64 cvalue.
643
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   888
	 *
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   889
	 * This same situation is usually considered an overflow (check handle_neg() function). However, here we have a special
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   890
	 * situation. If we do not allow this, then the user would never the able to use the following code:
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   891
	 *  VAR v : LINT; END_VAR
1cc0e1ca2aad Fix constant folding: now handles INT_MIN and neg_integer_c correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 640
diff changeset
   892
	 *    v := -9223372036854775809 ; (* - |INT64_MIN| == INT64_MIN *)
590
649667749171 Add support for -INT64_MIN values in literals.
Mario de Sousa <msousa@fe.up.pt>
parents: 588
diff changeset
   893
	 */
649667749171 Add support for -INT64_MIN values in literals.
Mario de Sousa <msousa@fe.up.pt>
parents: 588
diff changeset
   894
	// if (INT64_MIN == -INT64_MAX - 1) // We do not really need to check that the platform uses two's complement
621
e3616f6b6959 Remove remaining signed/unsigned comparison error messages when compiling.
Mario de Sousa <msousa@fe.up.pt>
parents: 612
diff changeset
   895
	if (VALID_CVALUE(uint64, symbol->exp) && (GET_CVALUE(uint64, symbol->exp) == (uint64_t)INT64_MAX+1)) {
590
649667749171 Add support for -INT64_MIN values in literals.
Mario de Sousa <msousa@fe.up.pt>
parents: 588
diff changeset
   896
		SET_CVALUE(int64, symbol, INT64_MIN);
649667749171 Add support for -INT64_MIN values in literals.
Mario de Sousa <msousa@fe.up.pt>
parents: 588
diff changeset
   897
	}
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   898
	return NULL;
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   899
}
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   900
567
e5deeb6d4d2f create extract_real_value() in absyntax_utils. NOTE: overflows not yet handled!
Mario de Sousa <msousa@fe.up.pt>
parents: 566
diff changeset
   901
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   902
void *constant_folding_c::visit(binary_integer_c *symbol) {
600
f5d4e9f91513 determine const value of hex, octal and bin literals correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 596
diff changeset
   903
	bool overflow;
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   904
	SET_CVALUE( int64, symbol, extract_int64_value (symbol, &overflow));
600
f5d4e9f91513 determine const value of hex, octal and bin literals correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 596
diff changeset
   905
	if (overflow) SET_OVFLOW(int64, symbol);
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   906
	SET_CVALUE(uint64, symbol, extract_uint64_value(symbol, &overflow));
600
f5d4e9f91513 determine const value of hex, octal and bin literals correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 596
diff changeset
   907
	if (overflow) SET_OVFLOW(uint64, symbol);
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   908
	return NULL;
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   909
}
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   910
567
e5deeb6d4d2f create extract_real_value() in absyntax_utils. NOTE: overflows not yet handled!
Mario de Sousa <msousa@fe.up.pt>
parents: 566
diff changeset
   911
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   912
void *constant_folding_c::visit(octal_integer_c *symbol) {
600
f5d4e9f91513 determine const value of hex, octal and bin literals correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 596
diff changeset
   913
	bool overflow;
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   914
	SET_CVALUE( int64, symbol, extract_int64_value (symbol, &overflow));
600
f5d4e9f91513 determine const value of hex, octal and bin literals correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 596
diff changeset
   915
	if (overflow) SET_OVFLOW(int64, symbol);
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   916
	SET_CVALUE(uint64, symbol, extract_uint64_value(symbol, &overflow));
600
f5d4e9f91513 determine const value of hex, octal and bin literals correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 596
diff changeset
   917
	if (overflow) SET_OVFLOW(uint64, symbol);
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   918
	return NULL;
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   919
}
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   920
567
e5deeb6d4d2f create extract_real_value() in absyntax_utils. NOTE: overflows not yet handled!
Mario de Sousa <msousa@fe.up.pt>
parents: 566
diff changeset
   921
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   922
void *constant_folding_c::visit(hex_integer_c *symbol) {
600
f5d4e9f91513 determine const value of hex, octal and bin literals correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 596
diff changeset
   923
	bool overflow;
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   924
	SET_CVALUE( int64, symbol, extract_int64_value (symbol, &overflow));
600
f5d4e9f91513 determine const value of hex, octal and bin literals correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 596
diff changeset
   925
	if (overflow) SET_OVFLOW(int64, symbol);
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   926
	SET_CVALUE(uint64, symbol, extract_uint64_value(symbol, &overflow));
600
f5d4e9f91513 determine const value of hex, octal and bin literals correctly.
Mario de Sousa <msousa@fe.up.pt>
parents: 596
diff changeset
   927
	if (overflow) SET_OVFLOW(uint64, symbol);
569
0d1ab9e78574 Add data structure for storing overflow of constant values.
Mario de Sousa <msousa@fe.up.pt>
parents: 568
diff changeset
   928
	return NULL;
0d1ab9e78574 Add data structure for storing overflow of constant values.
Mario de Sousa <msousa@fe.up.pt>
parents: 568
diff changeset
   929
}
0d1ab9e78574 Add data structure for storing overflow of constant values.
Mario de Sousa <msousa@fe.up.pt>
parents: 568
diff changeset
   930
0d1ab9e78574 Add data structure for storing overflow of constant values.
Mario de Sousa <msousa@fe.up.pt>
parents: 568
diff changeset
   931
0d1ab9e78574 Add data structure for storing overflow of constant values.
Mario de Sousa <msousa@fe.up.pt>
parents: 568
diff changeset
   932
/*
0d1ab9e78574 Add data structure for storing overflow of constant values.
Mario de Sousa <msousa@fe.up.pt>
parents: 568
diff changeset
   933
integer_literal:
0d1ab9e78574 Add data structure for storing overflow of constant values.
Mario de Sousa <msousa@fe.up.pt>
parents: 568
diff changeset
   934
  integer_type_name '#' signed_integer	{$$ = new integer_literal_c($1, $3, locloc(@$));}
0d1ab9e78574 Add data structure for storing overflow of constant values.
Mario de Sousa <msousa@fe.up.pt>
parents: 568
diff changeset
   935
| integer_type_name '#' binary_integer	{$$ = new integer_literal_c($1, $3, locloc(@$));}
0d1ab9e78574 Add data structure for storing overflow of constant values.
Mario de Sousa <msousa@fe.up.pt>
parents: 568
diff changeset
   936
| integer_type_name '#' octal_integer	{$$ = new integer_literal_c($1, $3, locloc(@$));}
0d1ab9e78574 Add data structure for storing overflow of constant values.
Mario de Sousa <msousa@fe.up.pt>
parents: 568
diff changeset
   937
| integer_type_name '#' hex_integer	{$$ = new integer_literal_c($1, $3, locloc(@$));}
0d1ab9e78574 Add data structure for storing overflow of constant values.
Mario de Sousa <msousa@fe.up.pt>
parents: 568
diff changeset
   938
*/
0d1ab9e78574 Add data structure for storing overflow of constant values.
Mario de Sousa <msousa@fe.up.pt>
parents: 568
diff changeset
   939
// SYM_REF2(integer_literal_c, type, value)
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   940
void *constant_folding_c::visit(integer_literal_c *symbol) {
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   941
	symbol->value->accept(*this);
575
a1b63f776535 cleaning up the code...
Mario de Sousa <msousa@fe.up.pt>
parents: 574
diff changeset
   942
	DO_UNARY_OPER( int64, /* none */, symbol->value);
a1b63f776535 cleaning up the code...
Mario de Sousa <msousa@fe.up.pt>
parents: 574
diff changeset
   943
	DO_UNARY_OPER(uint64, /* none */, symbol->value);
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   944
	return NULL;
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   945
}
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   946
567
e5deeb6d4d2f create extract_real_value() in absyntax_utils. NOTE: overflows not yet handled!
Mario de Sousa <msousa@fe.up.pt>
parents: 566
diff changeset
   947
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   948
void *constant_folding_c::visit(real_literal_c *symbol) {
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   949
	symbol->value->accept(*this);
575
a1b63f776535 cleaning up the code...
Mario de Sousa <msousa@fe.up.pt>
parents: 574
diff changeset
   950
	DO_UNARY_OPER(real64, /* none */, symbol->value);
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   951
	return NULL;
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   952
}
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   953
567
e5deeb6d4d2f create extract_real_value() in absyntax_utils. NOTE: overflows not yet handled!
Mario de Sousa <msousa@fe.up.pt>
parents: 566
diff changeset
   954
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   955
void *constant_folding_c::visit(bit_string_literal_c *symbol) {
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   956
	return NULL;
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   957
}
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   958
567
e5deeb6d4d2f create extract_real_value() in absyntax_utils. NOTE: overflows not yet handled!
Mario de Sousa <msousa@fe.up.pt>
parents: 566
diff changeset
   959
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   960
void *constant_folding_c::visit(boolean_literal_c *symbol) {
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   961
	symbol->value->accept(*this);
575
a1b63f776535 cleaning up the code...
Mario de Sousa <msousa@fe.up.pt>
parents: 574
diff changeset
   962
	DO_UNARY_OPER(bool, /* none */, symbol->value);
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   963
	return NULL;
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   964
}
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   965
567
e5deeb6d4d2f create extract_real_value() in absyntax_utils. NOTE: overflows not yet handled!
Mario de Sousa <msousa@fe.up.pt>
parents: 566
diff changeset
   966
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   967
void *constant_folding_c::visit(boolean_true_c *symbol) {
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   968
	SET_CVALUE(bool, symbol, true);
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   969
	return NULL;
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   970
}
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   971
567
e5deeb6d4d2f create extract_real_value() in absyntax_utils. NOTE: overflows not yet handled!
Mario de Sousa <msousa@fe.up.pt>
parents: 566
diff changeset
   972
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   973
void *constant_folding_c::visit(boolean_false_c *symbol) {
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   974
	SET_CVALUE(bool, symbol, false);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   975
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   976
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   977
633
73b56dc69e61 Fix bug with task interval using fixed_point value for duration items
Laurent Bessard
parents: 621
diff changeset
   978
/************************/
73b56dc69e61 Fix bug with task interval using fixed_point value for duration items
Laurent Bessard
parents: 621
diff changeset
   979
/* B 1.2.3.1 - Duration */
73b56dc69e61 Fix bug with task interval using fixed_point value for duration items
Laurent Bessard
parents: 621
diff changeset
   980
/********* **************/
73b56dc69e61 Fix bug with task interval using fixed_point value for duration items
Laurent Bessard
parents: 621
diff changeset
   981
void *constant_folding_c::visit(fixed_point_c *symbol) {
73b56dc69e61 Fix bug with task interval using fixed_point value for duration items
Laurent Bessard
parents: 621
diff changeset
   982
	bool overflow;
73b56dc69e61 Fix bug with task interval using fixed_point value for duration items
Laurent Bessard
parents: 621
diff changeset
   983
	SET_CVALUE(real64, symbol, extract_real_value(symbol, &overflow));
73b56dc69e61 Fix bug with task interval using fixed_point value for duration items
Laurent Bessard
parents: 621
diff changeset
   984
	if (overflow) SET_OVFLOW(real64, symbol);
73b56dc69e61 Fix bug with task interval using fixed_point value for duration items
Laurent Bessard
parents: 621
diff changeset
   985
	return NULL;
73b56dc69e61 Fix bug with task interval using fixed_point value for duration items
Laurent Bessard
parents: 621
diff changeset
   986
}
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
   987
774
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
   988
/*********************/
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
   989
/* B 1.4 - Variables */
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
   990
/*********************/
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
   991
// #if DO_CONSTANT_PROPAGATION__
774
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
   992
void *constant_folding_c::visit(symbolic_variable_c *symbol) {
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
   993
	std::string varName = get_var_name_c::get_name(symbol->var_name)->value;
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
   994
	if (values.count(varName) > 0) 
774
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
   995
		symbol->const_value = values[varName];
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
   996
	return NULL;
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
   997
}
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
   998
// #endif  // DO_CONSTANT_PROPAGATION__
774
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
   999
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1000
void *constant_folding_c::visit(symbolic_constant_c *symbol) {
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1001
	std::string varName = get_var_name_c::get_name(symbol->var_name)->value;
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1002
	if (values.count(varName) > 0) 
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1003
		symbol->const_value = values[varName];
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1004
	return NULL;
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1005
}
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1006
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1007
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1008
/******************************************/
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1009
/* B 1.4.3 - Declaration & Initialisation */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1010
/******************************************/
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1011
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1012
/* Do the constant folding for VAR_EXTERNAL and VAR_GLOBAL pairs.
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1013
 *  This function is called from the declaration_check_c, since it has easy access to the extern<->global pairing information
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1014
 *  needed for this function to work.
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1015
 */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1016
int constant_folding_c::handle_var_extern_global_pair(symbol_c *extern_var_name, symbol_c *extern_var_decl, symbol_c *global_var_name, symbol_c *global_var_decl) {  
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1017
  // the minimum infor we must get to make sense
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1018
  if (NULL == global_var_decl) ERROR;
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1019
  if (NULL == extern_var_name) ERROR;
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1020
  
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1021
  symbol_c *init_value = type_initial_value_c::get(global_var_decl);  
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1022
  if (NULL == init_value)   return 0; // this is probably a FB datatype, for which no initial value exists! Do nothing and return.
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1023
  
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1024
  // Do constant folding of the initial value!
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1025
  //   This is required since this function may be called before we do the iterative constant folding of the complete library!
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1026
  init_value->accept(*this);  
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1027
  
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1028
  if (NULL != extern_var_name) extern_var_name->const_value = init_value->const_value;
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1029
  if (NULL != extern_var_decl) extern_var_decl->const_value = init_value->const_value;  // Note that each external variable declaration has its own datatype specification, so we can set this symbol's const_value too!
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1030
  // we could leave the constant folding of the global variable itself for later, when we iteratively visit the whole library, but there is nor harm in doing it now!
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1031
  if (NULL != global_var_name) global_var_name->const_value = init_value->const_value;
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1032
  if (NULL != global_var_decl) global_var_decl->const_value = init_value->const_value;  // Note that each external variable declaration has its own datatype specification, so we can set this symbol's const_value too!
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1033
  return 0;
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1034
}
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1035
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1036
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1037
  
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1038
void *constant_folding_c::handle_var_decl(symbol_c *var_list, bool fixed_init_value) {
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1039
  fixed_init_value_ = fixed_init_value;
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1040
  var_list->accept(*this); 
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1041
  fixed_init_value_ = false; 
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1042
  return NULL;
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1043
}
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1044
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1045
void *constant_folding_c::handle_var_list_decl(symbol_c *var_list, symbol_c *type_decl) {
964
5f4dfe6670da Fix bugs introduced in previous commit (once again do constant folding of all literals in type declarations)
mjsousa
parents: 963
diff changeset
  1046
  type_decl->accept(*this);  // Do constant folding of the initial value, and literals in subranges! (we will probably be doing this multiple times for the same init value, but this is safe as the cvalue is idem-potent)
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1047
  symbol_c *init_value = type_initial_value_c::get(type_decl);  
970
0ede7ca157e2 Remove debugging code left in by mistake.
mjsousa
parents: 969
diff changeset
  1048
  if (NULL == init_value)   {return NULL;} // this is probably a FB datatype, for which no initial value exists! Do nothing and return.
968
649e03abbfc1 Do constant folding of default initial values of datatypes.
mjsousa
parents: 967
diff changeset
  1049
  init_value->accept(*this); // necessary when handling default initial values, that were not constant folded in the call type_decl->accept(*this)
649e03abbfc1 Do constant folding of default initial values of datatypes.
mjsousa
parents: 967
diff changeset
  1050
  
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1051
  list_c *list = dynamic_cast<list_c *>(var_list);
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1052
  if (NULL == list) ERROR;
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1053
  for (int i = 0; i < list->n; i++) {
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1054
    token_c *var_name = dynamic_cast<token_c *>(list->elements[i]);
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1055
    if (NULL == var_name) {
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1056
      if (NULL != dynamic_cast<extensible_input_parameter_c *>(list->elements[i]))
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1057
        continue; // this is an extensible standard function. Ignore this variable, and continue!
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1058
      // debug_c::print(list->elements[i]);
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1059
      ERROR;
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1060
    }
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1061
    list->elements[i]->const_value = init_value->const_value;
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1062
    if (fixed_init_value_) {
974
a47c2df5ae3d Fix previous commit (symtable operator[] must return a reference to the stored value!)
mjsousa
parents: 973
diff changeset
  1063
      values[var_name->value] = init_value->const_value;
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1064
    }
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1065
  }
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1066
  return NULL;
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1067
}
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1068
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1069
//SYM_REF0(constant_option_c)     // Not needed!
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1070
//SYM_REF0(retain_option_c)       // Not needed!
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1071
//SYM_REF0(non_retain_option_c)   // Not needed!
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1072
bool constant_folding_c::is_constant(symbol_c *option) {return (NULL != dynamic_cast<constant_option_c *>(option));}
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1073
bool constant_folding_c::is_retain  (symbol_c *option) {return (NULL != dynamic_cast<  retain_option_c *>(option));}
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1074
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1075
/* | var1_list ',' variable_name */
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1076
//SYM_LIST(var1_list_c)           // Not needed!
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1077
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1078
/* spec_init is one of the following...
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1079
 *    simple_spec_init_c *
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1080
 *    subrange_spec_init_c *
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1081
 *    enumerated_spec_init_c *
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1082
 */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1083
// SYM_REF2(var1_init_decl_c, var1_list, spec_init)
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1084
void *constant_folding_c::visit(var1_init_decl_c *symbol) {return handle_var_list_decl(symbol->var1_list, symbol->spec_init);}
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1085
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1086
/* | [var1_list ','] variable_name integer '..' */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1087
/* NOTE: This is an extension to the standard!!! */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1088
//SYM_REF2(extensible_input_parameter_c, var_name, first_index)          // Not needed!
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1089
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1090
/* var1_list ':' array_spec_init */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1091
//SYM_REF2(array_var_init_decl_c, var1_list, array_spec_init)            // We do not yet handle arrays!
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1092
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1093
/*  var1_list ':' initialized_structure */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1094
//SYM_REF2(structured_var_init_decl_c, var1_list, initialized_structure) // We do not yet handle structures!
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1095
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1096
/* fb_name_list ':' function_block_type_name ASSIGN structure_initialization */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1097
//SYM_REF2(fb_name_decl_c, fb_name_list, fb_spec_init)                   // We do not yet handle FBs!
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1098
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1099
/* fb_name_list ',' fb_name */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1100
//SYM_LIST(fb_name_list_c)                                               // Not needed!
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1101
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1102
/* VAR_INPUT [option] input_declaration_list END_VAR */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1103
/* option -> the RETAIN/NON_RETAIN/<NULL> directive... */
964
5f4dfe6670da Fix bugs introduced in previous commit (once again do constant folding of all literals in type declarations)
mjsousa
parents: 963
diff changeset
  1104
//SYM_REF3(input_declarations_c, option, input_declaration_list, method) // Not needed since we inherit from iterator_visitor_c!
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1105
// NOTE: Input variables can take any initial value, so we can not set the const_value annotation => we set fixed_init_value to false !!!
964
5f4dfe6670da Fix bugs introduced in previous commit (once again do constant folding of all literals in type declarations)
mjsousa
parents: 963
diff changeset
  1106
//       We must still visit it iteratively, to set the const_value of all literals in the type declarations.
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1107
void *constant_folding_c::visit(input_declarations_c *symbol) {return handle_var_decl(symbol->input_declaration_list, false);}
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1108
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1109
/* helper symbol for input_declarations */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1110
//SYM_LIST(input_declaration_list_c)                                     // Not needed!
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1111
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1112
/* VAR_OUTPUT [RETAIN | NON_RETAIN] var_init_decl_list END_VAR */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1113
/* option -> may be NULL ! */
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1114
//SYM_REF3(output_declarations_c, option, var_init_decl_list, method) 
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1115
void *constant_folding_c::visit(output_declarations_c *symbol) {return handle_var_decl(symbol->var_init_decl_list, !is_retain(symbol->option) && function_pou_);}
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1116
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1117
/*  VAR_IN_OUT var_declaration_list END_VAR */
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1118
//SYM_REF1(input_output_declarations_c, var_declaration_list)
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1119
// NOTE: Input variables can take any initial value, so we can not set the const_value annotation => we set fixed_init_value to false !!!
964
5f4dfe6670da Fix bugs introduced in previous commit (once again do constant folding of all literals in type declarations)
mjsousa
parents: 963
diff changeset
  1120
//       We must still visit it iteratively, to set the const_value of all literals in the type declarations.
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1121
void *constant_folding_c::visit(input_output_declarations_c *symbol) {return handle_var_decl(symbol->var_declaration_list, false);}
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1122
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1123
/* helper symbol for input_output_declarations */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1124
/* var_declaration_list var_declaration ';' */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1125
//SYM_LIST(var_declaration_list_c)                                       // Not needed since we inherit from iterator_visitor_c!
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1126
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1127
/*  var1_list ':' array_specification */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1128
//SYM_REF2(array_var_declaration_c, var1_list, array_specification)      // We do not yet handle arrays! 
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1129
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1130
/*  var1_list ':' structure_type_name */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1131
//SYM_REF2(structured_var_declaration_c, var1_list, structure_type_name) // We do not yet handle structures!
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1132
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1133
/* VAR [CONSTANT] var_init_decl_list END_VAR */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1134
/* option -> may be NULL ! */
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1135
//SYM_REF2(var_declarations_c, option, var_init_decl_list)
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1136
void *constant_folding_c::visit(var_declarations_c *symbol) {return handle_var_decl(symbol->var_init_decl_list, false);}
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1137
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1138
/*  VAR RETAIN var_init_decl_list END_VAR */
964
5f4dfe6670da Fix bugs introduced in previous commit (once again do constant folding of all literals in type declarations)
mjsousa
parents: 963
diff changeset
  1139
//SYM_REF1(retentive_var_declarations_c, var_init_decl_list)             // Not needed since we inherit from iterator_visitor_c!
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1140
// NOTE: Retentive variables can take any initial value, so we can not set the const_value annotation => we set fixed_init_value to false !!!
964
5f4dfe6670da Fix bugs introduced in previous commit (once again do constant folding of all literals in type declarations)
mjsousa
parents: 963
diff changeset
  1141
//       We must still visit it iteratively, to set the const_value of all literals in the type declarations.
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1142
void *constant_folding_c::visit(retentive_var_declarations_c *symbol) {return handle_var_decl(symbol->var_init_decl_list, false);}
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1143
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1144
#if 0  
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1145
// TODO
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1146
/*  VAR [CONSTANT|RETAIN|NON_RETAIN] located_var_decl_list END_VAR */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1147
/* option -> may be NULL ! */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1148
SYM_REF2(located_var_declarations_c, option, located_var_decl_list)
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1149
/* helper symbol for located_var_declarations */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1150
/* located_var_decl_list located_var_decl ';' */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1151
SYM_LIST(located_var_decl_list_c)
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1152
/*  [variable_name] location ':' located_var_spec_init */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1153
/* variable_name -> may be NULL ! */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1154
SYM_REF3(located_var_decl_c, variable_name, location, located_var_spec_init)
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1155
#endif
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1156
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1157
/*| VAR_EXTERNAL [CONSTANT] external_declaration_list END_VAR */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1158
/* option -> may be NULL ! */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1159
// SYM_REF2(external_var_declarations_c, option, external_declaration_list)
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1160
void *constant_folding_c::visit(external_var_declarations_c *symbol) {return handle_var_decl(symbol->external_declaration_list, is_constant(symbol->option));}
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1161
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1162
/* helper symbol for external_var_declarations */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1163
/*| external_declaration_list external_declaration';' */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1164
// SYM_LIST(external_declaration_list_c)
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1165
// void *constant_folding_c::visit(external_declaration_list_c *symbol) {} // Not needed: we inherit from iterator_c
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1166
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1167
/*  global_var_name ':' (simple_specification|subrange_specification|enumerated_specification|array_specification|prev_declared_structure_type_name|function_block_type_name */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1168
//SYM_REF2(external_declaration_c, global_var_name, specification)
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1169
void *constant_folding_c::visit(external_declaration_c *symbol) {
969
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1170
  // Note that specification->const_value will have been set by handle_var_extern_global_pair(), which is called from declaration_check_c
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1171
  symbol->global_var_name->const_value = symbol->specification->const_value;
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1172
  if (fixed_init_value_) {
974
a47c2df5ae3d Fix previous commit (symtable operator[] must return a reference to the stored value!)
mjsousa
parents: 973
diff changeset
  1173
    values[get_var_name_c::get_name(symbol->global_var_name)->value] = symbol->specification->const_value;
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1174
  }
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1175
  // If the datatype specification is a subrange or array, do constant folding of all the literals in that type declaration... (ex: literals in array subrange limits)
964
5f4dfe6670da Fix bugs introduced in previous commit (once again do constant folding of all literals in type declarations)
mjsousa
parents: 963
diff changeset
  1176
  symbol->specification->accept(*this);  // should never get to change the const_value of the symbol->specification symbol (only its children!).
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1177
  return NULL;
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1178
}
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1179
969
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1180
/* NOTE that the constant folding of GLOBAL variables is already handled by handle_var_extern_global_pair, which 
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1181
 * is called from declaration_check_c,
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1182
 * This is done like this because we need to know the pairing of external<->global variables to get the cvalue
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1183
 * from the global variable. Since the external<->global pairing information is available in the declaration_check_c,
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1184
 * we have that class call the constant_folding_c::handle_var_extern_global_pair(), which will actually do the 
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1185
 * constant folding of the global and the external variable declarations!
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1186
 */
969
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1187
/* NOTE: The constant propagation portion of this algorithm must still be done here!!
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1188
 * Even though the constant folding of GLOBAL variables are already handled by handle_var_extern_global_pair(),
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1189
 * we must still visit them here, since when doing constant propagation of a Configuration or a Resource we need the
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1190
 * values of constant variables to be placed in the values[] map, as these same variables may be used to declare
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1191
 * arrays of a variable size
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1192
 *    VAR_GLOBAL CONSTANT max     : INT := 42;             END_VAR
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1193
 *    VAR_GLOBAL          array_v : ARRAY [1..max] of INT; END_VAR  <---- NOTE the use of 'max' in the subrange!
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1194
 */
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1195
/*| VAR_GLOBAL [CONSTANT|RETAIN] global_var_decl_list END_VAR */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1196
/* option -> may be NULL ! */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1197
// SYM_REF2(global_var_declarations_c, option, global_var_decl_list)
969
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1198
/* Note that calling handle_var_decl() will result in doing constant folding of literals (of datatype initial values)
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1199
 * that were already constant folded by the method handle_var_extern_global_pair()
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1200
 * Nevertheless, since constant folding is idem-potent, it is simpler to just call handle_var_decl() instead
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1201
 * of writing some code specific for this situation!
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1202
 */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1203
void *constant_folding_c::visit(global_var_declarations_c *symbol) {return handle_var_decl(symbol->global_var_decl_list, is_constant(symbol->option));}
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1204
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1205
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1206
/* helper symbol for global_var_declarations */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1207
/*| global_var_decl_list global_var_decl ';' */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1208
// SYM_LIST(global_var_decl_list_c)
969
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1209
// void *constant_folding_c::visit(global_var_decl_list_c *symbol) {} // Not needed: we inherit from iterator_c
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1210
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1211
/*| global_var_spec ':' [located_var_spec_init|function_block_type_name] */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1212
/* type_specification ->may be NULL ! */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1213
//SYM_REF2(global_var_decl_c, global_var_spec, type_specification)
969
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1214
void *constant_folding_c::visit(global_var_decl_c *symbol) {
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1215
  /* global_var_spec may be either a global_var_spec_c or a global_var_list_c.
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1216
   * Since we already have a nice method that handles var lists (handle_var_list_decl() )
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1217
   * if it is a global_var_spec_c we will create a temporary list so we can call that method!
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1218
   */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1219
  global_var_spec_c *var_spec = dynamic_cast<global_var_spec_c *>(symbol->global_var_spec);
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1220
  if (NULL == var_spec) {
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1221
    // global_var_spec is a global_var_list_c
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1222
    return handle_var_list_decl(symbol->global_var_spec, symbol->type_specification);
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1223
  } else {
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1224
    global_var_list_c var_list;
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1225
    var_list.add_element(var_spec->global_var_name);
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1226
    return handle_var_list_decl(&var_list, symbol->type_specification);
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1227
  }
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1228
}
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1229
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1230
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1231
/*| global_var_name location */
969
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1232
//SYM_REF2(global_var_spec_c, global_var_name, location)              // Not needed!
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1233
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1234
/*  AT direct_variable */
969
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1235
//SYM_REF1(location_c, direct_variable)                               // Not needed!
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1236
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1237
/*| global_var_list ',' global_var_name */
969
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1238
//SYM_LIST(global_var_list_c)                                         // Not needed!
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1239
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1240
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1241
#if 0  
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1242
// TODO
969
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1243
// We do not do constant folding of strings yet, so there is no need to implement this now!
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1244
/*  var1_list ':' single_byte_string_spec */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1245
SYM_REF2(single_byte_string_var_declaration_c, var1_list, single_byte_string_spec)
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1246
/*  STRING ['[' integer ']'] [ASSIGN single_byte_character_string] */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1247
/* integer ->may be NULL ! */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1248
/* single_byte_character_string ->may be NULL ! */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1249
SYM_REF2(single_byte_string_spec_c, string_spec, single_byte_character_string)
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1250
/*   STRING ['[' integer ']'] */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1251
/* integer ->may be NULL ! */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1252
SYM_REF2(single_byte_limited_len_string_spec_c, string_type_name, character_string_len)
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1253
/*  WSTRING ['[' integer ']'] */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1254
/* integer ->may be NULL ! */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1255
SYM_REF2(double_byte_limited_len_string_spec_c, string_type_name, character_string_len)
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1256
/*  var1_list ':' double_byte_string_spec */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1257
SYM_REF2(double_byte_string_var_declaration_c, var1_list, double_byte_string_spec)
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1258
/*  WSTRING ['[' integer ']'] [ASSIGN double_byte_character_string] */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1259
/* integer ->may be NULL ! */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1260
/* double_byte_character_string ->may be NULL ! */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1261
SYM_REF2(double_byte_string_spec_c, string_spec, double_byte_character_string)
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1262
/*| VAR [RETAIN|NON_RETAIN] incompl_located_var_decl_list END_VAR */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1263
/* option ->may be NULL ! */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1264
SYM_REF2(incompl_located_var_declarations_c, option, incompl_located_var_decl_list)
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1265
/* helper symbol for incompl_located_var_declarations */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1266
/*| incompl_located_var_decl_list incompl_located_var_decl ';' */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1267
SYM_LIST(incompl_located_var_decl_list_c)
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1268
/*  variable_name incompl_location ':' var_spec */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1269
SYM_REF3(incompl_located_var_decl_c, variable_name, incompl_location, var_spec)
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1270
/*  AT incompl_location_token */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1271
SYM_TOKEN(incompl_location_c)
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1272
/* intermediate helper symbol for:
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1273
 *  - non_retentive_var_decls
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1274
 *  - output_declarations
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1275
 */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1276
SYM_LIST(var_init_decl_list_c)
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1277
#endif
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1278
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1279
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1280
/***********************/
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1281
/* B 1.5.1 - Functions */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1282
/***********************/
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1283
/* enumvalue_symtable is filled in by enum_declaration_check_c, during stage3 semantic verification, with a list of all enumerated constants declared inside this POU */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1284
//SYM_REF4(function_declaration_c, derived_function_name, type_name, var_declarations_list, function_body, enumvalue_symtable_t enumvalue_symtable;)
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1285
void *constant_folding_c::visit(function_declaration_c *symbol) {
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1286
	values.clear(); /* Clear global map */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1287
	/* Add initial value of all declared variables into Values map. */
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1288
	function_pou_ = true;
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1289
	symbol->var_declarations_list->accept(*this);
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1290
	function_pou_ = false;
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1291
	symbol->function_body->accept(*this);
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1292
	return NULL;
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1293
}
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1294
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1295
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1296
/* intermediate helper symbol for
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1297
 * - function_declaration
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1298
 * - function_block_declaration
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1299
 * - program_declaration
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1300
 */
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1301
// SYM_LIST(var_declarations_list_c) // Not needed since we inherit from iterator_c
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1302
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1303
/* option -> storage method, CONSTANT or <null> */
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1304
// SYM_REF2(function_var_decls_c, option, decl_list)
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1305
// NOTE: function_var_decls_c is only used inside Functions, so it is safe to call with fixed_init_value_ = true 
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1306
void *constant_folding_c::visit(function_var_decls_c *symbol) {return handle_var_decl(symbol->decl_list, true);}
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1307
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1308
/* intermediate helper symbol for function_var_decls */
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1309
// SYM_LIST(var2_init_decl_list_c) // Not needed since we inherit from iterator_c
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1310
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1311
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1312
/*****************************/
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1313
/* B 1.5.2 - Function Blocks */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1314
/*****************************/
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1315
/*  FUNCTION_BLOCK derived_function_block_name io_OR_other_var_declarations function_block_body END_FUNCTION_BLOCK */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1316
/* enumvalue_symtable is filled in by enum_declaration_check_c, during stage3 semantic verification, with a list of all enumerated constants declared inside this POU */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1317
//SYM_REF3(function_block_declaration_c, fblock_name, var_declarations, fblock_body, enumvalue_symtable_t enumvalue_symtable;)
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1318
void *constant_folding_c::visit(function_block_declaration_c *symbol) {
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1319
	values.clear(); /* Clear global map */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1320
	/* Add initial value of all declared variables into Values map. */
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1321
	function_pou_ = false;
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1322
	symbol->var_declarations->accept(*this);
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1323
	symbol->fblock_body->accept(*this);
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1324
	return NULL;
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1325
}
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1326
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1327
/*  VAR_TEMP temp_var_decl_list END_VAR */
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1328
// SYM_REF1(temp_var_decls_c, var_decl_list)
970
0ede7ca157e2 Remove debugging code left in by mistake.
mjsousa
parents: 969
diff changeset
  1329
void *constant_folding_c::visit(temp_var_decls_c *symbol) {return handle_var_decl(symbol->var_decl_list, true);}
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1330
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1331
/* intermediate helper symbol for temp_var_decls */
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1332
// SYM_LIST(temp_var_decls_list_c)
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1333
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1334
/*  VAR NON_RETAIN var_init_decl_list END_VAR */
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1335
// SYM_REF1(non_retentive_var_decls_c, var_decl_list)
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1336
// NOTE: non_retentive_var_decls_c is only used inside FBs and Programs, so it is safe to call with fixed_init_value_ = false 
970
0ede7ca157e2 Remove debugging code left in by mistake.
mjsousa
parents: 969
diff changeset
  1337
void *constant_folding_c::visit(non_retentive_var_decls_c *symbol) {return handle_var_decl(symbol->var_decl_list, false);}
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1338
788
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1339
774
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1340
/**********************/
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1341
/* B 1.5.3 - Programs */
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1342
/**********************/
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1343
/*  PROGRAM program_type_name program_var_declarations_list function_block_body END_PROGRAM */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1344
//SYM_REF3(program_declaration_c, program_type_name, var_declarations, function_block_body, enumvalue_symtable_t enumvalue_symtable;)
774
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1345
void *constant_folding_c::visit(program_declaration_c *symbol) {
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1346
	values.clear(); /* Clear global map */
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1347
	/* Add initial value of all declared variables into Values map. */
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1348
	function_pou_ = false;
787
6e2671e0f1a8 Fix constant_folding missing call. [Bug found by Mario.]
Manuele Conti <conti.ma@alice.it>
parents: 783
diff changeset
  1349
	symbol->var_declarations->accept(*this);
774
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1350
	symbol->function_block_body->accept(*this);
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1351
	return NULL;
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1352
}
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1353
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1354
969
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1355
/********************************/
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1356
/* B 1.7 Configuration elements */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1357
/********************************/
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1358
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1359
/*
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1360
CONFIGURATION configuration_name
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1361
   optional_global_var_declarations
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1362
   (resource_declaration_list | single_resource_declaration)
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1363
   optional_access_declarations
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1364
   optional_instance_specific_initializations
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1365
END_CONFIGURATION
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1366
*/
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1367
/* enumvalue_symtable is filled in by enum_declaration_check_c, during stage3 semantic verification, with a list of all enumerated constants declared inside this POU */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1368
// SYM_REF5(configuration_declaration_c, configuration_name, global_var_declarations, resource_declarations, access_declarations, instance_specific_initializations, 
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1369
//          enumvalue_symtable_t enumvalue_symtable; localvar_symbmap_t localvar_symbmap; localvar_symbvec_t localvar_symbvec;)
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1370
void *constant_folding_c::visit(configuration_declaration_c *symbol) {
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1371
	values.clear(); /* Clear global map */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1372
	/* Add initial value of all declared variables into Values map. */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1373
	function_pou_ = false;
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1374
	return iterator_visitor_c::visit(symbol); // let the base iterator class handle the rest (basically iterate through the whole configuration and do the constant folding!
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1375
}
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1376
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1377
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1378
/* helper symbol for configuration_declaration */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1379
// SYM_LIST(resource_declaration_list_c)           // Not needed: we inherit from iterator_c
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1380
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1381
/*
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1382
RESOURCE resource_name ON resource_type_name
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1383
   optional_global_var_declarations
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1384
   single_resource_declaration
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1385
END_RESOURCE
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1386
*/
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1387
/* enumvalue_symtable is filled in by enum_declaration_check_c, during stage3 semantic verification, with a list of all enumerated constants declared inside this POU */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1388
// SYM_REF4(resource_declaration_c, resource_name, resource_type_name, global_var_declarations, resource_declaration, 
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1389
//          enumvalue_symtable_t enumvalue_symtable; localvar_symbmap_t localvar_symbmap; localvar_symbvec_t localvar_symbvec;)
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1390
void *constant_folding_c::visit(resource_declaration_c *symbol) {
973
f86d5d6bb04e Do constant propagation of configuration/resource variables, taking into account scope of variables.
mjsousa
parents: 970
diff changeset
  1391
	values.push(); /* Create inner scope */
969
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1392
	/* Add initial value of all declared variables into Values map. */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1393
	function_pou_ = false;
973
f86d5d6bb04e Do constant propagation of configuration/resource variables, taking into account scope of variables.
mjsousa
parents: 970
diff changeset
  1394
	iterator_visitor_c::visit(symbol); // let the base iterator class handle the rest (basically iterate through the whole configuration and do the constant folding!
f86d5d6bb04e Do constant propagation of configuration/resource variables, taking into account scope of variables.
mjsousa
parents: 970
diff changeset
  1395
	values.pop(); /* Delete inner scope */
f86d5d6bb04e Do constant propagation of configuration/resource variables, taking into account scope of variables.
mjsousa
parents: 970
diff changeset
  1396
	return NULL;
969
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1397
}
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1398
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1399
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1400
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1401
/* task_configuration_list program_configuration_list */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1402
// SYM_REF2(single_resource_declaration_c, task_configuration_list, program_configuration_list)
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1403
/* helper symbol for single_resource_declaration */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1404
// SYM_LIST(task_configuration_list_c)
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1405
/* helper symbol for single_resource_declaration */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1406
// SYM_LIST(program_configuration_list_c)
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1407
/* helper symbol for: (access_path, instance_specific_init) */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1408
// SYM_LIST(any_fb_name_list_c)
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1409
/*  [resource_name '.'] global_var_name ['.' structure_element_name] */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1410
// SYM_REF3(global_var_reference_c, resource_name, global_var_name, structure_element_name)
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1411
/*  prev_declared_program_name '.' symbolic_variable */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1412
// SYM_REF2(program_output_reference_c, program_name, symbolic_variable)
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1413
/*  TASK task_name task_initialization */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1414
// SYM_REF2(task_configuration_c, task_name, task_initialization)
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1415
/*  '(' [SINGLE ASSIGN data_source ','] [INTERVAL ASSIGN data_source ','] PRIORITY ASSIGN integer ')' */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1416
// SYM_REF3(task_initialization_c, single_data_source, interval_data_source, priority_data_source)
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1417
/*  PROGRAM [RETAIN | NON_RETAIN] program_name [WITH task_name] ':' program_type_name ['(' prog_conf_elements ')'] */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1418
/* NOTE: The parameter 'called_prog_declaration'is used to pass data between stage 3 and stage4 */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1419
// SYM_REF5(program_configuration_c, retain_option, program_name, task_name, program_type_name, prog_conf_elements,
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1420
//          symbol_c *called_prog_declaration;)
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1421
/* prog_conf_elements ',' prog_conf_element */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1422
// SYM_LIST(prog_conf_elements_c)
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1423
/*  fb_name WITH task_name */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1424
// SYM_REF2(fb_task_c, fb_name, task_name)
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1425
/*  any_symbolic_variable ASSIGN prog_data_source */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1426
// SYM_REF2(prog_cnxn_assign_c, symbolic_variable, prog_data_source)
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1427
/* any_symbolic_variable SENDTO data_sink */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1428
// SYM_REF2(prog_cnxn_sendto_c, symbolic_variable, data_sink)
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1429
/* VAR_CONFIG instance_specific_init_list END_VAR */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1430
// SYM_REF1(instance_specific_initializations_c, instance_specific_init_list)
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1431
/* helper symbol for instance_specific_initializations */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1432
// SYM_LIST(instance_specific_init_list_c)
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1433
/* resource_name '.' program_name '.' {fb_name '.'}
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1434
    ((variable_name [location] ':' located_var_spec_init) | (fb_name ':' fb_initialization))
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1435
*/
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1436
// SYM_REF6(instance_specific_init_c, resource_name, program_name, any_fb_name_list, variable_name, location, initialization)
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1437
/* helper symbol for instance_specific_init */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1438
/* function_block_type_name ':=' structure_initialization */
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1439
// SYM_REF2(fb_initialization_c, function_block_type_name, structure_initialization)
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1440
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1441
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1442
706a152731ab Do constant propagation inside Configurations and Resources (required for support of extension: array [1..max] OF int); (Resources is still buggy)
mjsousa
parents: 968
diff changeset
  1443
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1444
/****************************************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1445
/* B.2 - Language IL (Instruction List) */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1446
/****************************************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1447
/***********************************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1448
/* B 2.1 Instructions and Operands */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1449
/***********************************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1450
/* Not needed, since we inherit from iterator_visitor_c */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1451
/*| instruction_list il_instruction */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1452
// SYM_LIST(instruction_list_c)
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1453
// void *constant_folding_c::visit(instruction_list_c *symbol) {}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1454
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1455
/* | label ':' [il_incomplete_instruction] eol_list */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1456
// SYM_REF2(il_instruction_c, label, il_instruction)
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1457
// void *visit(instruction_list_c *symbol);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1458
void *constant_folding_c::visit(il_instruction_c *symbol) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1459
	if (NULL == symbol->il_instruction) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1460
		/* This empty/null il_instruction does not change the value of the current/default IL variable.
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1461
		 * So it inherits the candidate_datatypes from it's previous IL instructions!
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1462
		 */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1463
		intersect_prev_cvalues(symbol);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1464
	} else {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1465
		il_instruction_c fake_prev_il_instruction = *symbol;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1466
		intersect_prev_cvalues(&fake_prev_il_instruction);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1467
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1468
		if (symbol->prev_il_instruction.size() == 0)  prev_il_instruction = NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1469
		else                                          prev_il_instruction = &fake_prev_il_instruction;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1470
		symbol->il_instruction->accept(*this);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1471
		prev_il_instruction = NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1472
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1473
		/* This object has (inherits) the same cvalues as the il_instruction */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1474
		symbol->const_value = symbol->il_instruction->const_value;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1475
	}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1476
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1477
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1478
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1479
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1480
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1481
void *constant_folding_c::visit(il_simple_operation_c *symbol) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1482
	/* determine the cvalue of the operand */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1483
	if (NULL != symbol->il_operand) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1484
		symbol->il_operand->accept(*this);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1485
	}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1486
	/* determine the cvalue resulting from executing the il_operator... */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1487
	il_operand = symbol->il_operand;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1488
	symbol->il_simple_operator->accept(*this);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1489
	il_operand = NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1490
	/* This object has (inherits) the same cvalues as the il_instruction */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1491
	symbol->const_value = symbol->il_simple_operator->const_value;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1492
	return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1493
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1494
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1495
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1496
/* TODO: handle function invocations... */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1497
/* | function_name [il_operand_list] */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1498
/* NOTE: The parameters 'called_function_declaration' and 'extensible_param_count' are used to pass data between the stage 3 and stage 4. */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1499
// SYM_REF2(il_function_call_c, function_name, il_operand_list, symbol_c *called_function_declaration; int extensible_param_count;)
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1500
// void *constant_folding_c::visit(il_function_call_c *symbol) {}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1501
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1502
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1503
/* | il_expr_operator '(' [il_operand] eol_list [simple_instr_list] ')' */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1504
// SYM_REF3(il_expression_c, il_expr_operator, il_operand, simple_instr_list);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1505
void *constant_folding_c::visit(il_expression_c *symbol) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1506
  symbol_c *prev_il_instruction_backup = prev_il_instruction;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1507
  
690
6156ee2b4e32 Correctly generate C code for IL expressions, i.e. IL instructions inside parenthesis.
Mario de Sousa <msousa@fe.up.pt>
parents: 667
diff changeset
  1508
  /* Stage2 will insert an artificial (and equivalent) LD <il_operand> to the simple_instr_list if necessary. We can therefore ignore the 'il_operand' entry! */
6156ee2b4e32 Correctly generate C code for IL expressions, i.e. IL instructions inside parenthesis.
Mario de Sousa <msousa@fe.up.pt>
parents: 667
diff changeset
  1509
  // if (NULL != symbol->il_operand)
6156ee2b4e32 Correctly generate C code for IL expressions, i.e. IL instructions inside parenthesis.
Mario de Sousa <msousa@fe.up.pt>
parents: 667
diff changeset
  1510
  //   symbol->il_operand->accept(*this);
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1511
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1512
  if(symbol->simple_instr_list != NULL)
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1513
    symbol->simple_instr_list->accept(*this);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1514
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1515
  /* Now do the operation,  */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1516
  il_operand = symbol->simple_instr_list;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1517
  prev_il_instruction = prev_il_instruction_backup;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1518
  symbol->il_expr_operator->accept(*this);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1519
  il_operand = NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1520
  
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1521
  /* This object has (inherits) the same cvalues as the il_instruction */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1522
  symbol->const_value = symbol->il_expr_operator->const_value;
690
6156ee2b4e32 Correctly generate C code for IL expressions, i.e. IL instructions inside parenthesis.
Mario de Sousa <msousa@fe.up.pt>
parents: 667
diff changeset
  1523
  
6156ee2b4e32 Correctly generate C code for IL expressions, i.e. IL instructions inside parenthesis.
Mario de Sousa <msousa@fe.up.pt>
parents: 667
diff changeset
  1524
  /* Since stage2 will insert an artificial (and equivalent) LD <il_operand> to the simple_instr_list when an 'il_operand' exists, we know
6156ee2b4e32 Correctly generate C code for IL expressions, i.e. IL instructions inside parenthesis.
Mario de Sousa <msousa@fe.up.pt>
parents: 667
diff changeset
  1525
   * that if (symbol->il_operand != NULL), then the first IL instruction in the simple_instr_list will be the equivalent and artificial
6156ee2b4e32 Correctly generate C code for IL expressions, i.e. IL instructions inside parenthesis.
Mario de Sousa <msousa@fe.up.pt>
parents: 667
diff changeset
  1526
   * 'LD <il_operand>' IL instruction.
6156ee2b4e32 Correctly generate C code for IL expressions, i.e. IL instructions inside parenthesis.
Mario de Sousa <msousa@fe.up.pt>
parents: 667
diff changeset
  1527
   * Just to be cosistent, we will copy the constant info back into the il_operand, even though this should not be necessary!
6156ee2b4e32 Correctly generate C code for IL expressions, i.e. IL instructions inside parenthesis.
Mario de Sousa <msousa@fe.up.pt>
parents: 667
diff changeset
  1528
   */
6156ee2b4e32 Correctly generate C code for IL expressions, i.e. IL instructions inside parenthesis.
Mario de Sousa <msousa@fe.up.pt>
parents: 667
diff changeset
  1529
  if ((NULL != symbol->il_operand) && ((NULL == symbol->simple_instr_list) || (0 == ((list_c *)symbol->simple_instr_list)->n))) ERROR; // stage2 is not behaving as we expect it to!
6156ee2b4e32 Correctly generate C code for IL expressions, i.e. IL instructions inside parenthesis.
Mario de Sousa <msousa@fe.up.pt>
parents: 667
diff changeset
  1530
  if  (NULL != symbol->il_operand)
6156ee2b4e32 Correctly generate C code for IL expressions, i.e. IL instructions inside parenthesis.
Mario de Sousa <msousa@fe.up.pt>
parents: 667
diff changeset
  1531
    symbol->il_operand->const_value = ((list_c *)symbol->simple_instr_list)->elements[0]->const_value;
6156ee2b4e32 Correctly generate C code for IL expressions, i.e. IL instructions inside parenthesis.
Mario de Sousa <msousa@fe.up.pt>
parents: 667
diff changeset
  1532
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1533
  return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1534
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1535
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1536
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1537
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1538
void *constant_folding_c::visit(il_jump_operation_c *symbol) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1539
  /* recursive call to fill const values... */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1540
  il_operand = NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1541
  symbol->il_jump_operator->accept(*this);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1542
  il_operand = NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1543
  /* This object has (inherits) the same cvalues as the il_jump_operator */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1544
  symbol->const_value = symbol->il_jump_operator->const_value;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1545
  return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1546
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1547
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1548
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1549
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1550
/* FB calls leave the value in the accumulator unchanged */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1551
/*   il_call_operator prev_declared_fb_name
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1552
 * | il_call_operator prev_declared_fb_name '(' ')'
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1553
 * | il_call_operator prev_declared_fb_name '(' eol_list ')'
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1554
 * | il_call_operator prev_declared_fb_name '(' il_operand_list ')'
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1555
 * | il_call_operator prev_declared_fb_name '(' eol_list il_param_list ')'
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1556
 */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1557
/* NOTE: The parameter 'called_fb_declaration'is used to pass data between stage 3 and stage4 (although currently it is not used in stage 4 */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1558
// SYM_REF4(il_fb_call_c, il_call_operator, fb_name, il_operand_list, il_param_list, symbol_c *called_fb_declaration)
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1559
void *constant_folding_c::visit(il_fb_call_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1560
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1561
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1562
/* TODO: handle function invocations... */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1563
/* | function_name '(' eol_list [il_param_list] ')' */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1564
/* NOTE: The parameter 'called_function_declaration' is used to pass data between the stage 3 and stage 4. */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1565
// SYM_REF2(il_formal_funct_call_c, function_name, il_param_list, symbol_c *called_function_declaration; int extensible_param_count;)
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1566
// void *constant_folding_c::visit(il_formal_funct_call_c *symbol) {return NULL;}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1567
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1568
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1569
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1570
/* Not needed, since we inherit from iterator_visitor_c */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1571
//  void *constant_folding_c::visit(il_operand_list_c *symbol);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1572
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1573
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1574
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1575
/* | simple_instr_list il_simple_instruction */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1576
/* This object is referenced by il_expression_c objects */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1577
void *constant_folding_c::visit(simple_instr_list_c *symbol) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1578
  if (symbol->n <= 0)
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1579
    return NULL;  /* List is empty! Nothing to do. */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1580
    
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1581
  for(int i = 0; i < symbol->n; i++)
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1582
    symbol->elements[i]->accept(*this);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1583
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1584
  /* This object has (inherits) the same cvalues as the il_jump_operator */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1585
  symbol->const_value = symbol->elements[symbol->n-1]->const_value;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1586
  return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1587
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1588
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1589
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1590
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1591
// SYM_REF1(il_simple_instruction_c, il_simple_instruction, symbol_c *prev_il_instruction;)
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1592
void *constant_folding_c::visit(il_simple_instruction_c *symbol) {
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1593
  if (symbol->prev_il_instruction.size() > 1) ERROR; /* There should be no labeled insructions inside an IL expression! */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1594
  if (symbol->prev_il_instruction.size() == 0)  prev_il_instruction = NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1595
  else                                          prev_il_instruction = symbol->prev_il_instruction[0];
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1596
  symbol->il_simple_instruction->accept(*this);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1597
  prev_il_instruction = NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1598
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1599
  /* This object has (inherits) the same cvalues as the il_jump_operator */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1600
  symbol->const_value = symbol->il_simple_instruction->const_value;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1601
  return NULL;
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1602
}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1603
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1604
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1605
/*
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1606
    void *visit(il_param_list_c *symbol);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1607
    void *visit(il_param_assignment_c *symbol);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1608
    void *visit(il_param_out_assignment_c *symbol);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1609
*/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1610
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1611
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1612
/*******************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1613
/* B 2.2 Operators */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1614
/*******************/
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1615
void *constant_folding_c::visit(   LD_operator_c *symbol) {return handle_move(symbol, il_operand);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1616
void *constant_folding_c::visit(  LDN_operator_c *symbol) {return handle_not (symbol, il_operand);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1617
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1618
/* NOTE: we are implementing a constant folding algorithm, not a constant propagation algorithm.
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1619
 *       For the constant propagation algorithm, the correct implementation of ST(N)_operator_c would be...
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1620
 */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1621
//void *constant_folding_c::visit(   ST_operator_c *symbol) {return handle_move(il_operand, symbol);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1622
//void *constant_folding_c::visit(  STN_operator_c *symbol) {return handle_not (il_operand, symbol);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1623
void *constant_folding_c::visit(   ST_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1624
void *constant_folding_c::visit(  STN_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1625
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1626
/* NOTE: the standard allows syntax in which the NOT operator is followed by an optional <il_operand>
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1627
 *              NOT [<il_operand>]
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1628
 *       However, it does not define the semantic of the NOT operation when the <il_operand> is specified.
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1629
 *       We therefore consider it an error if an il_operand is specified! This error will be caught elsewhere!
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1630
 */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1631
void *constant_folding_c::visit(  NOT_operator_c *symbol) {return handle_not(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1632
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1633
/* NOTE: Since we are only implementing a constant folding algorithm, and not a constant propagation algorithm,
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1634
 *       the following IL instructions do not change/set the value of the il_operand!
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1635
 */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1636
void *constant_folding_c::visit(    S_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1637
void *constant_folding_c::visit(    R_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1638
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1639
/* FB calls leave the value in the accumulator unchanged */
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1640
void *constant_folding_c::visit(   S1_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1641
void *constant_folding_c::visit(   R1_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1642
void *constant_folding_c::visit(  CLK_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1643
void *constant_folding_c::visit(   CU_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1644
void *constant_folding_c::visit(   CD_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1645
void *constant_folding_c::visit(   PV_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1646
void *constant_folding_c::visit(   IN_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1647
void *constant_folding_c::visit(   PT_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1648
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1649
void *constant_folding_c::visit(  AND_operator_c *symbol) {return handle_and (symbol, prev_il_instruction, il_operand);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1650
void *constant_folding_c::visit(   OR_operator_c *symbol) {return handle_or  (symbol, prev_il_instruction, il_operand);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1651
void *constant_folding_c::visit(  XOR_operator_c *symbol) {return handle_xor (symbol, prev_il_instruction, il_operand);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1652
void *constant_folding_c::visit( ANDN_operator_c *symbol) {       handle_and (symbol, prev_il_instruction, il_operand); return handle_not(symbol, symbol);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1653
void *constant_folding_c::visit(  ORN_operator_c *symbol) {       handle_or  (symbol, prev_il_instruction, il_operand); return handle_not(symbol, symbol);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1654
void *constant_folding_c::visit( XORN_operator_c *symbol) {       handle_xor (symbol, prev_il_instruction, il_operand); return handle_not(symbol, symbol);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1655
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1656
void *constant_folding_c::visit(  ADD_operator_c *symbol) {return handle_add (symbol, prev_il_instruction, il_operand);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1657
void *constant_folding_c::visit(  SUB_operator_c *symbol) {return handle_sub (symbol, prev_il_instruction, il_operand);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1658
void *constant_folding_c::visit(  MUL_operator_c *symbol) {return handle_mul (symbol, prev_il_instruction, il_operand);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1659
void *constant_folding_c::visit(  DIV_operator_c *symbol) {return handle_div (symbol, prev_il_instruction, il_operand);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1660
void *constant_folding_c::visit(  MOD_operator_c *symbol) {return handle_mod (symbol, prev_il_instruction, il_operand);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1661
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1662
void *constant_folding_c::visit(   GT_operator_c *symbol) {       handle_cmp (symbol, prev_il_instruction, il_operand, > );}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1663
void *constant_folding_c::visit(   GE_operator_c *symbol) {       handle_cmp (symbol, prev_il_instruction, il_operand, >=);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1664
void *constant_folding_c::visit(   EQ_operator_c *symbol) {       handle_cmp (symbol, prev_il_instruction, il_operand, ==);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1665
void *constant_folding_c::visit(   LT_operator_c *symbol) {       handle_cmp (symbol, prev_il_instruction, il_operand, < );}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1666
void *constant_folding_c::visit(   LE_operator_c *symbol) {       handle_cmp (symbol, prev_il_instruction, il_operand, <=);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1667
void *constant_folding_c::visit(   NE_operator_c *symbol) {       handle_cmp (symbol, prev_il_instruction, il_operand, !=);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1668
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1669
void *constant_folding_c::visit(  CAL_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1670
void *constant_folding_c::visit(  RET_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1671
void *constant_folding_c::visit(  JMP_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1672
void *constant_folding_c::visit( CALC_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1673
void *constant_folding_c::visit(CALCN_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1674
void *constant_folding_c::visit( RETC_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1675
void *constant_folding_c::visit(RETCN_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1676
void *constant_folding_c::visit( JMPC_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1677
void *constant_folding_c::visit(JMPCN_operator_c *symbol) {return handle_move(symbol, prev_il_instruction);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1678
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1679
567
e5deeb6d4d2f create extract_real_value() in absyntax_utils. NOTE: overflows not yet handled!
Mario de Sousa <msousa@fe.up.pt>
parents: 566
diff changeset
  1680
e5deeb6d4d2f create extract_real_value() in absyntax_utils. NOTE: overflows not yet handled!
Mario de Sousa <msousa@fe.up.pt>
parents: 566
diff changeset
  1681
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
  1682
/***************************************/
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
  1683
/* B.3 - Language ST (Structured Text) */
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
  1684
/***************************************/
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
  1685
/***********************/
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
  1686
/* B 3.1 - Expressions */
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
  1687
/***********************/
612
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1688
void *constant_folding_c::visit(    or_expression_c *symbol) {symbol->l_exp->accept(*this); symbol->r_exp->accept(*this); return handle_or (symbol, symbol->l_exp, symbol->r_exp);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1689
void *constant_folding_c::visit(   xor_expression_c *symbol) {symbol->l_exp->accept(*this); symbol->r_exp->accept(*this); return handle_xor(symbol, symbol->l_exp, symbol->r_exp);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1690
void *constant_folding_c::visit(   and_expression_c *symbol) {symbol->l_exp->accept(*this); symbol->r_exp->accept(*this); return handle_and(symbol, symbol->l_exp, symbol->r_exp);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1691
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1692
void *constant_folding_c::visit(   equ_expression_c *symbol) {symbol->l_exp->accept(*this); symbol->r_exp->accept(*this);        handle_cmp (symbol, symbol->l_exp, symbol->r_exp, ==);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1693
void *constant_folding_c::visit(notequ_expression_c *symbol) {symbol->l_exp->accept(*this); symbol->r_exp->accept(*this);        handle_cmp (symbol, symbol->l_exp, symbol->r_exp, !=);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1694
void *constant_folding_c::visit(    lt_expression_c *symbol) {symbol->l_exp->accept(*this); symbol->r_exp->accept(*this);        handle_cmp (symbol, symbol->l_exp, symbol->r_exp, < );}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1695
void *constant_folding_c::visit(    gt_expression_c *symbol) {symbol->l_exp->accept(*this); symbol->r_exp->accept(*this);        handle_cmp (symbol, symbol->l_exp, symbol->r_exp, > );}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1696
void *constant_folding_c::visit(    le_expression_c *symbol) {symbol->l_exp->accept(*this); symbol->r_exp->accept(*this);        handle_cmp (symbol, symbol->l_exp, symbol->r_exp, <=);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1697
void *constant_folding_c::visit(    ge_expression_c *symbol) {symbol->l_exp->accept(*this); symbol->r_exp->accept(*this);        handle_cmp (symbol, symbol->l_exp, symbol->r_exp, >=);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1698
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1699
void *constant_folding_c::visit(   add_expression_c *symbol) {symbol->l_exp->accept(*this); symbol->r_exp->accept(*this); return handle_add(symbol, symbol->l_exp, symbol->r_exp);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1700
void *constant_folding_c::visit(   sub_expression_c *symbol) {symbol->l_exp->accept(*this); symbol->r_exp->accept(*this); return handle_sub(symbol, symbol->l_exp, symbol->r_exp);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1701
void *constant_folding_c::visit(   mul_expression_c *symbol) {symbol->l_exp->accept(*this); symbol->r_exp->accept(*this); return handle_mul(symbol, symbol->l_exp, symbol->r_exp);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1702
void *constant_folding_c::visit(   div_expression_c *symbol) {symbol->l_exp->accept(*this); symbol->r_exp->accept(*this); return handle_div(symbol, symbol->l_exp, symbol->r_exp);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1703
void *constant_folding_c::visit(   mod_expression_c *symbol) {symbol->l_exp->accept(*this); symbol->r_exp->accept(*this); return handle_mod(symbol, symbol->l_exp, symbol->r_exp);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1704
void *constant_folding_c::visit( power_expression_c *symbol) {symbol->l_exp->accept(*this); symbol->r_exp->accept(*this); return handle_pow(symbol, symbol->l_exp, symbol->r_exp);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1705
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1706
void *constant_folding_c::visit(   neg_expression_c *symbol) {symbol->  exp->accept(*this); return handle_neg(symbol, symbol->exp);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1707
void *constant_folding_c::visit(   not_expression_c *symbol) {symbol->  exp->accept(*this); return handle_not(symbol, symbol->exp);}
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1708
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
parents: 607
diff changeset
  1709
/* TODO: handle function invocations... */
633
73b56dc69e61 Fix bug with task interval using fixed_point value for duration items
Laurent Bessard
parents: 621
diff changeset
  1710
// void *fill_candidate_datatypes_c::visit(function_invocation_c *symbol) {}
774
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1711
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1712
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1713
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1714
/*********************************/
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1715
/* B 3.2.1 Assignment Statements */
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1716
/*********************************/
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1717
void *constant_folding_c::visit(assignment_statement_c *symbol) {
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1718
	std::string varName;
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1719
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1720
	symbol->r_exp->accept(*this);
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1721
	symbol->l_exp->accept(*this); // if the lvalue has an array, do contant folding of the array indexes!
774
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1722
	symbol->l_exp->const_value = symbol->r_exp->const_value;
974
a47c2df5ae3d Fix previous commit (symtable operator[] must return a reference to the stored value!)
mjsousa
parents: 973
diff changeset
  1723
	values[get_var_name_c::get_name(symbol->l_exp)->value] = symbol->l_exp->const_value;
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1724
	return NULL;
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1725
}
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1726
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
mjsousa
parents: 965
diff changeset
  1727
#if DO_CONSTANT_PROPAGATION__
774
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1728
/********************************/
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1729
/* B 3.2.3 Selection Statements */
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1730
/********************************/
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1731
void *constant_folding_c::visit(if_statement_c *symbol) {
788
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1732
	map_values_t values_incoming;
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1733
	map_values_t values_statement_result;
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1734
	map_values_t values_elsestatement_result;
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1735
	map_values_t::iterator itr;
780
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1736
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1737
	/* Optimize dead code */
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1738
	symbol->expression->accept(*this);
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1739
	if (VALID_CVALUE(bool, symbol->expression) && GET_CVALUE(bool, symbol->expression) == false)
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1740
		return NULL;
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1741
774
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1742
	values_incoming = values; /* save incoming status */
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1743
	symbol->statement_list->accept(*this);
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1744
	values_statement_result = values;
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1745
	if (NULL != symbol->else_statement_list) {
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1746
		values = values_incoming;
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1747
		symbol->else_statement_list->accept(*this);
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1748
		values_elsestatement_result = values;
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1749
	} else
979af2009d88 Start to implement constant propagation algorithm.
Manuele Conti <conti.ma@alice.it>
parents: 735
diff changeset
  1750
		values_elsestatement_result = values_incoming;
788
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1751
	values = inner_left_join_values(values_statement_result, values_elsestatement_result);
780
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1752
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1753
	return NULL;
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1754
}
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1755
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1756
/********************************/
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1757
/* B 3.2.4 Iteration Statements */
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1758
/********************************/
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1759
void *constant_folding_c::visit(for_statement_c *symbol) {
788
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1760
	map_values_t values_incoming;
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1761
	map_values_t values_statement_result;
780
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1762
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1763
	values_incoming = values; /* save incoming status */
782
c8cd69801b7e Fix constant propagation alg. in for statement like Mario suggestion.
Manuele Conti <conti.ma@alice.it>
parents: 781
diff changeset
  1764
	symbol->beg_expression->accept(*this);
c8cd69801b7e Fix constant propagation alg. in for statement like Mario suggestion.
Manuele Conti <conti.ma@alice.it>
parents: 781
diff changeset
  1765
	symbol->end_expression->accept(*this);
974
a47c2df5ae3d Fix previous commit (symtable operator[] must return a reference to the stored value!)
mjsousa
parents: 973
diff changeset
  1766
	values[get_var_name_c::get_name(symbol->control_variable)->value]._int64.status = const_value_c::cs_non_const;
782
c8cd69801b7e Fix constant propagation alg. in for statement like Mario suggestion.
Manuele Conti <conti.ma@alice.it>
parents: 781
diff changeset
  1767
c8cd69801b7e Fix constant propagation alg. in for statement like Mario suggestion.
Manuele Conti <conti.ma@alice.it>
parents: 781
diff changeset
  1768
	/* Optimize dead code */
788
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1769
	if (NULL != symbol->by_expression) {
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1770
		symbol->by_expression->accept(*this);
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1771
		if (VALID_CVALUE(int64, symbol->by_expression ) &&   GET_CVALUE(int64, symbol->by_expression ) > 0 &&
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1772
			VALID_CVALUE(int64, symbol->beg_expression) && VALID_CVALUE(int64, symbol->end_expression)     &&
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1773
			  GET_CVALUE(int64, symbol->beg_expression) >    GET_CVALUE(int64, symbol->end_expression))
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1774
			return NULL;
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1775
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1776
		if (VALID_CVALUE(int64, symbol->by_expression ) &&   GET_CVALUE(int64, symbol->by_expression ) < 0 &&
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1777
			VALID_CVALUE(int64, symbol->beg_expression) && VALID_CVALUE(int64, symbol->end_expression)    &&
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1778
			  GET_CVALUE(int64, symbol->beg_expression) <    GET_CVALUE(int64, symbol->end_expression))
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1779
			return NULL;
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1780
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1781
	} else {
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1782
		if (VALID_CVALUE(int64, symbol->beg_expression) && VALID_CVALUE(int64, symbol->end_expression)     &&
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1783
			  GET_CVALUE(int64, symbol->beg_expression) >    GET_CVALUE(int64, symbol->end_expression))
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1784
			return NULL;
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1785
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1786
	}
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1787
782
c8cd69801b7e Fix constant propagation alg. in for statement like Mario suggestion.
Manuele Conti <conti.ma@alice.it>
parents: 781
diff changeset
  1788
780
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1789
	symbol->statement_list->accept(*this);
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1790
	values_statement_result = values;
788
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1791
	values = inner_left_join_values(values_statement_result, values_incoming);
780
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1792
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1793
	return NULL;
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1794
}
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1795
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1796
void *constant_folding_c::visit(while_statement_c *symbol) {
788
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1797
	map_values_t values_incoming;
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1798
	map_values_t values_statement_result;
780
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1799
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1800
	/* Optimize dead code */
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1801
	symbol->expression->accept(*this);
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1802
	if (VALID_CVALUE(bool, symbol->expression) && GET_CVALUE(bool, symbol->expression) == false)
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1803
		return NULL;
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1804
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1805
	values_incoming = values; /* save incoming status */
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1806
	symbol->statement_list->accept(*this);
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1807
	values_statement_result = values;
788
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1808
	values = inner_left_join_values(values_statement_result, values_incoming);
780
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1809
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1810
	return NULL;
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1811
}
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1812
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1813
void *constant_folding_c::visit(repeat_statement_c *symbol) {
788
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1814
	map_values_t values_incoming;
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1815
	map_values_t values_statement_result;
780
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1816
790
a722594dcd64 Fix constant propagation for repeat_statement_c class.
Manuele Conti <conti.ma@alice.it>
parents: 789
diff changeset
  1817
	values_incoming = values; /* save incoming status */
a722594dcd64 Fix constant propagation for repeat_statement_c class.
Manuele Conti <conti.ma@alice.it>
parents: 789
diff changeset
  1818
	symbol->statement_list->accept(*this);
a722594dcd64 Fix constant propagation for repeat_statement_c class.
Manuele Conti <conti.ma@alice.it>
parents: 789
diff changeset
  1819
780
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1820
	/* Optimize dead code */
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1821
	symbol->expression->accept(*this);
790
a722594dcd64 Fix constant propagation for repeat_statement_c class.
Manuele Conti <conti.ma@alice.it>
parents: 789
diff changeset
  1822
	if (VALID_CVALUE(bool, symbol->expression) && GET_CVALUE(bool, symbol->expression) == true)
780
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1823
		return NULL;
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1824
9fbdf8a7430e Add constant propagation algorithm for loop cycles.
Manuele Conti <conti.ma@alice.it>
parents: 776
diff changeset
  1825
	values_statement_result = values;
788
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1826
	values = inner_left_join_values(values_statement_result, values_incoming);
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1827
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1828
	return NULL;
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1829
}
aa56031e5cb3 Implement Mario's suggestions:
Manuele Conti <conti.ma@alice.it>
parents: 787
diff changeset
  1830
792
78083edf93d5 disable not yet complete constant propagation algorithm (currently brocken and producing incorrect results),
Mario de Sousa <msousa@fe.up.pt>
parents: 791
diff changeset
  1831
#endif  // DO_CONSTANT_PROPAGATION__
78083edf93d5 disable not yet complete constant propagation algorithm (currently brocken and producing incorrect results),
Mario de Sousa <msousa@fe.up.pt>
parents: 791
diff changeset
  1832
78083edf93d5 disable not yet complete constant propagation algorithm (currently brocken and producing incorrect results),
Mario de Sousa <msousa@fe.up.pt>
parents: 791
diff changeset
  1833
963
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1834
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1835
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1836
e3d4dca7520b Do constant folding of variable's initial value (allows correct C code generation with variables in the subrange of an array declaration: ARRAY [1..max] of INT).
mjsousa
parents: 945
diff changeset
  1837