stage3/constant_folding.hh
author mjsousa
Sat, 27 Dec 2014 09:41:01 +0000
changeset 976 619a2b9f6edf
parent 973 f86d5d6bb04e
child 981 aad6aa35ce60
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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) 2009-2012  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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/* Determine the value of an constant expression.
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 * A reference to the relevant type definition is returned.
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 *
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 * For example:
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 *       2 + 3       -> returns reference 
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 *       22.2 - 5    -> returns reference
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 *       etc...
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 */
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#include <vector>
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#include "../absyntax_utils/absyntax_utils.hh"
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#include "../util/symtable.hh"
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/* For the moment we disable constant propagation algorithm as it is not yet complete, 
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 * and due to this is currently brocken and producing incorrect results!
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 */
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#define DO_CONSTANT_PROPAGATION__ 0
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class constant_folding_c : public iterator_visitor_c {
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    search_varfb_instance_type_c *search_varfb_instance_type;
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    int error_count;
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    bool warning_found;
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    int current_display_error_level;
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    /* Pointer to the previous IL instruction, which contains the current cvalue of the data stored in the IL stack, i.e. the default variable, a.k.a. accumulator */
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    symbol_c *prev_il_instruction;
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    /* the current IL operand being analyzed */
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    symbol_c *il_operand;
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  public:
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    constant_folding_c(symbol_c *symbol = NULL);
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    virtual ~constant_folding_c(void);
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    int get_error_count();
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    int 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);
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    typedef symtable_c<const_value_c> map_values_t;
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  private:
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    map_values_t values;
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    void *handle_var_list_decl(symbol_c *var_list, symbol_c *type_decl);
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    void *handle_var_decl     (symbol_c *var_list, bool fixed_init_value);
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    // Flag to indicate whether the variables in the variable declaration list will always have a fixed value when the POU is executed!
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    // VAR CONSTANT ... END_VAR will always be true
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    // VAR          ... END_VAR will always be true for functions (who initialise local variables every time they are called), but false for FBs and PROGRAMS
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    bool fixed_init_value_; 
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    bool function_pou_;
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    bool is_constant(symbol_c *option);
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    bool is_retain  (symbol_c *option);
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  public:
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	#if 0
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	// not currently needed, so comment it out!...
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	/* utility functions for other stage3 algorithms to access the contant folded values */
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	/* written as static since we do not need to iteratively visit the symbols! */
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	// returns true if both symbols have the same value in all the cvalues
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	static bool is_equal_cvalue(symbol_c *symbol_1, symbol_c *symbol_2);
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	#endif
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  private:
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    /*********************/
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    /* B 1.2 - Constants */
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    /*********************/
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    /******************************/
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    /* B 1.2.1 - Numeric Literals */
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    /******************************/
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    void *visit(real_c *symbol);
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    void *visit(integer_c *symbol);
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    void *visit(neg_real_c *symbol);
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    void *visit(neg_integer_c *symbol);
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    void *visit(binary_integer_c *symbol);
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    void *visit(octal_integer_c *symbol);
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    void *visit(hex_integer_c *symbol);
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    void *visit(integer_literal_c *symbol);
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    void *visit(real_literal_c *symbol);
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    void *visit(bit_string_literal_c *symbol);
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    void *visit(boolean_literal_c *symbol);
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    void *visit(boolean_true_c *symbol);
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    void *visit(boolean_false_c *symbol);
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    /************************/
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    /* B 1.2.3.1 - Duration */
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    /********* **************/
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    void *visit(fixed_point_c *symbol);
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    /*********************/
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    /* B 1.4 - Variables */
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    /*********************/
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//     #if DO_CONSTANT_PROPAGATION__
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    void *visit(symbolic_variable_c *symbol);
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//     #endif // DO_CONSTANT_PROPAGATION__
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    void *visit(symbolic_constant_c *symbol);
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    /******************************************/
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   130
    /* B 1.4.3 - Declaration & Initialisation */
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   131
    /******************************************/
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    void *visit(        input_declarations_c *symbol);
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   133
    void *visit(       output_declarations_c *symbol);
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    void *visit( input_output_declarations_c *symbol);
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   135
    void *visit(          var_declarations_c *symbol);
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   136
    void *visit(retentive_var_declarations_c *symbol);
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   137
    void *visit( external_var_declarations_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)
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   138
    void *visit(   global_var_declarations_c *symbol);
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   139
    void *visit(  external_declaration_c     *symbol);
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   140
    void *visit(global_var_decl_c            *symbol);
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   141
    void *visit( var1_init_decl_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).
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   142
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   143
    /**************************************/
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   144
    /* B.1.5 - Program organization units */
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   145
    /**************************************/
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   146
    /***********************/
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   147
    /* B 1.5.1 - Functions */
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   148
    /***********************/
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   149
    void *visit(function_declaration_c *symbol);
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   150
    void *visit(function_var_decls_c   *symbol);
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   151
963
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   152
    /*****************************/
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   153
    /* B 1.5.2 - Function Blocks */
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   154
    /*****************************/
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   155
    void *visit(function_block_declaration_c *symbol);
967
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
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   156
    void *visit(            temp_var_decls_c *symbol);
544ff4dff04f Do constant propagation to symbolic_variables, and correctly handle constant folding and propagation of variable declarations.
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   157
    void *visit(   non_retentive_var_decls_c *symbol);
774
979af2009d88 Start to implement constant propagation algorithm.
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   158
979af2009d88 Start to implement constant propagation algorithm.
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   159
    /**********************/
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   160
    /* B 1.5.3 - Programs */
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   161
    /**********************/
969
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   162
    void *visit(       program_declaration_c *symbol);
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   163
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   164
    /********************************/
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   165
    /* B 1.7 Configuration elements */
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   166
    /********************************/
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   167
    void *visit( configuration_declaration_c *symbol);
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   168
    void *visit(      resource_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).
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   169
774
979af2009d88 Start to implement constant propagation algorithm.
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   170
612
c062ff18d04f Constant folding for IL.
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   171
    /****************************************/
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   172
    /* B.2 - Language IL (Instruction List) */
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   173
    /****************************************/
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   174
    /***********************************/
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   175
    /* B 2.1 Instructions and Operands */
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   176
    /***********************************/
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   177
    // void *visit(instruction_list_c *symbol); /* Not needed, since we inherit from iterator_visitor_c */
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   178
    void *visit(il_instruction_c *symbol);
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   179
    void *visit(il_simple_operation_c *symbol);
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   180
    //void *visit(il_function_call_c *symbol);  /* TODO */
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   181
    void *visit(il_expression_c *symbol);
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diff changeset
   182
    void *visit(il_jump_operation_c *symbol);
c062ff18d04f Constant folding for IL.
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diff changeset
   183
    void *visit(il_fb_call_c *symbol);
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diff changeset
   184
    //void *visit(il_formal_funct_call_c *symbol);   /* TODO */
c062ff18d04f Constant folding for IL.
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   185
    //void *visit(il_operand_list_c *symbol);  /* Not needed, since we inherit from iterator_visitor_c */
c062ff18d04f Constant folding for IL.
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diff changeset
   186
    void *visit(simple_instr_list_c *symbol);
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diff changeset
   187
    void *visit(il_simple_instruction_c *symbol);
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diff changeset
   188
c062ff18d04f Constant folding for IL.
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   189
c062ff18d04f Constant folding for IL.
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   190
    /*******************/
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diff changeset
   191
    /* B 2.2 Operators */
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   192
    /*******************/
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diff changeset
   193
    void *visit(   LD_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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diff changeset
   194
    void *visit(  LDN_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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diff changeset
   195
    void *visit(   ST_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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diff changeset
   196
    void *visit(  STN_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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diff changeset
   197
    void *visit(  NOT_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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   198
    void *visit(    S_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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diff changeset
   199
    void *visit(    R_operator_c *symbol);
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diff changeset
   200
    void *visit(   S1_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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diff changeset
   201
    void *visit(   R1_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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diff changeset
   202
    void *visit(  CLK_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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parents: 568
diff changeset
   203
    void *visit(   CU_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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   204
    void *visit(   CD_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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   205
    void *visit(   PV_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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diff changeset
   206
    void *visit(   IN_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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diff changeset
   207
    void *visit(   PT_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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   208
    void *visit(  AND_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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   209
    void *visit(   OR_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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   210
    void *visit(  XOR_operator_c *symbol);
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   211
    void *visit( ANDN_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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   212
    void *visit(  ORN_operator_c *symbol);
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   213
    void *visit( XORN_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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   214
    void *visit(  ADD_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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   215
    void *visit(  SUB_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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diff changeset
   216
    void *visit(  MUL_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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diff changeset
   217
    void *visit(  DIV_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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diff changeset
   218
    void *visit(  MOD_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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diff changeset
   219
    void *visit(   GT_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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diff changeset
   220
    void *visit(   GE_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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diff changeset
   221
    void *visit(   EQ_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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diff changeset
   222
    void *visit(   LT_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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   223
    void *visit(   LE_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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diff changeset
   224
    void *visit(   NE_operator_c *symbol);
c062ff18d04f Constant folding for IL.
Mario de Sousa <msousa@fe.up.pt>
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diff changeset
   225
    void *visit(  CAL_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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diff changeset
   226
    void *visit( CALC_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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diff changeset
   227
    void *visit(CALCN_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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diff changeset
   228
    void *visit(  RET_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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diff changeset
   229
    void *visit( RETC_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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diff changeset
   230
    void *visit(RETCN_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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diff changeset
   231
    void *visit(  JMP_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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diff changeset
   232
    void *visit( JMPC_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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diff changeset
   233
    void *visit(JMPCN_operator_c *symbol);
c062ff18d04f Constant folding for IL.
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diff changeset
   234
    /* Symbol class handled together with function call checks */
c062ff18d04f Constant folding for IL.
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   235
    // void *visit(il_assign_operator_c *symbol, variable_name);
c062ff18d04f Constant folding for IL.
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parents: 568
diff changeset
   236
    /* Symbol class handled together with function call checks */
c062ff18d04f Constant folding for IL.
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diff changeset
   237
    // void *visit(il_assign_operator_c *symbol, option, variable_name);
c062ff18d04f Constant folding for IL.
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diff changeset
   238
564
dabffc3086dc Start constant_folding class.
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   239
    /***************************************/
dabffc3086dc Start constant_folding class.
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parents:
diff changeset
   240
    /* B.3 - Language ST (Structured Text) */
dabffc3086dc Start constant_folding class.
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parents:
diff changeset
   241
    /***************************************/
dabffc3086dc Start constant_folding class.
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parents:
diff changeset
   242
    /***********************/
dabffc3086dc Start constant_folding class.
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parents:
diff changeset
   243
    /* B 3.1 - Expressions */
dabffc3086dc Start constant_folding class.
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parents:
diff changeset
   244
    /***********************/
612
c062ff18d04f Constant folding for IL.
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diff changeset
   245
    void *visit(    or_expression_c *symbol);
c062ff18d04f Constant folding for IL.
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parents: 568
diff changeset
   246
    void *visit(   xor_expression_c *symbol);
c062ff18d04f Constant folding for IL.
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diff changeset
   247
    void *visit(   and_expression_c *symbol);
c062ff18d04f Constant folding for IL.
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parents: 568
diff changeset
   248
    void *visit(   equ_expression_c *symbol);
564
dabffc3086dc Start constant_folding class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   249
    void *visit(notequ_expression_c *symbol);
612
c062ff18d04f Constant folding for IL.
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diff changeset
   250
    void *visit(    lt_expression_c *symbol);
c062ff18d04f Constant folding for IL.
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diff changeset
   251
    void *visit(    gt_expression_c *symbol);
c062ff18d04f Constant folding for IL.
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diff changeset
   252
    void *visit(    le_expression_c *symbol);
c062ff18d04f Constant folding for IL.
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diff changeset
   253
    void *visit(    ge_expression_c *symbol);
c062ff18d04f Constant folding for IL.
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diff changeset
   254
    void *visit(   add_expression_c *symbol);
c062ff18d04f Constant folding for IL.
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parents: 568
diff changeset
   255
    void *visit(   sub_expression_c *symbol);
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    void *visit(   mul_expression_c *symbol);
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    void *visit(   div_expression_c *symbol);
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    void *visit(   mod_expression_c *symbol);
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    void *visit( power_expression_c *symbol);
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    void *visit(   neg_expression_c *symbol);
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    void *visit(   not_expression_c *symbol);
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    //void *visit(function_invocation_c *symbol); /* TODO */
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612
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    /*********************************/
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    /* B 3.2.1 Assignment Statements */
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    /*********************************/
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    void *visit(assignment_statement_c *symbol);
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    #if DO_CONSTANT_PROPAGATION__
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    /********************************/
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    /* B 3.2.3 Selection Statements */
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    /********************************/
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    void *visit(if_statement_c *symbol);
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    /********************************/
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    /* B 3.2.4 Iteration Statements */
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    /********************************/
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    void *visit(for_statement_c *symbol);
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    void *visit(while_statement_c *symbol);
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    void *visit(repeat_statement_c *symbol);
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    #endif // DO_CONSTANT_PROPAGATION__
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};
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