absyntax_utils/spec_init_separator.cc
author mjsousa
Sun, 14 Dec 2014 18:40:20 +0000
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parent 958 7474d2cd1d6e
permissions -rwxr-xr-x
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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/*
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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) 2007-2011  Laurent Bessard and Edouard Tisserant
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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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/*
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 * Seperation of type specification and default value constructs
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 * (for e.g. simple_spec_init_c), into a type specificiation part,
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 * and a default value part.
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 */
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#include "spec_init_separator.hh"
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#include "../main.hh" // required for ERROR() and ERROR_MSG() macros.
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//#define DEBUG
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#ifdef DEBUG
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#define TRACE(classname) printf("\n____%s____\n",classname);
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#else
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#define TRACE(classname)
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#endif
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spec_init_sperator_c *spec_init_sperator_c::get_class_instance(void) {
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  if (NULL == class_instance)
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    class_instance = new spec_init_sperator_c();
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  if (NULL == class_instance)
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    ERROR;
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  return class_instance;
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}
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 /* the only two public functions... */
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symbol_c *spec_init_sperator_c::get_spec(symbol_c *spec_init) {
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   search_what = search_spec;
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   return (symbol_c *)spec_init->accept(*get_class_instance());
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}
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symbol_c *spec_init_sperator_c::get_init(symbol_c *spec_init) {
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   search_what = search_init;
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   return (symbol_c *)spec_init->accept(*get_class_instance());
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}
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/*******************************************/
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/* B 1.1 - Letters, digits and identifiers */
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/*******************************************/
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// SYM_TOKEN(identifier_c)
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/* visitor for identifier_c should no longer be necessary. All references to derived datatypes are now stored in then */
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/* AST using either poutype_identifier_c or derived_datatype_identifier_c                                             */
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void *spec_init_sperator_c::visit(                 identifier_c *symbol) { ERROR; return NULL;} /* should never occur */
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void *spec_init_sperator_c::visit(         poutype_identifier_c *symbol) {
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  TRACE("spec_init_sperator_c::poutype_identifier_c");
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  switch (search_what) {
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    /* if we ever get called sith a simple identifier_c, then it must be a previously declared type... */
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    case search_spec: return symbol;
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    case search_init: return NULL;
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  }
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  ERROR; /* should never occur */
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  return NULL;
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  }
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void *spec_init_sperator_c::visit(derived_datatype_identifier_c *symbol) {
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  TRACE("spec_init_sperator_c::derived_datatype_identifier_c");
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  switch (search_what) {
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    /* if we ever get called sith a simple identifier_c, then it must be a previously declared type... */
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    case search_spec: return symbol;
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    case search_init: return NULL;
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  }
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  ERROR; /* should never occur */
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  return NULL;
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}
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/********************************/
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/* B 1.3.3 - Derived data types */
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/********************************/
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/* simple_specification ASSIGN constant */
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void *spec_init_sperator_c::visit(simple_spec_init_c *symbol) {
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  TRACE("spec_init_sperator_c::simple_spec_init_c");
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  switch (search_what) {
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    case search_spec: return symbol->simple_specification;
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    case search_init: return symbol->constant;
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  }
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  ERROR; /* should never occur */
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  return NULL;
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}
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/* subrange_specification ASSIGN signed_integer */
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void *spec_init_sperator_c::visit(subrange_spec_init_c *symbol) {
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  TRACE("spec_init_sperator_c::subrange_spec_init_c");
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  switch (search_what) {
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    case search_spec: return symbol->subrange_specification->accept(*this);
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    case search_init: return symbol->signed_integer;
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  }
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  ERROR; /* should never occur */
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  return NULL;
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}
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/*  integer_type_name '(' subrange')' */
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void *spec_init_sperator_c::visit(subrange_specification_c *symbol) {
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  TRACE("spec_init_sperator_c::subrange_specification_c");
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  switch (search_what) {
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    case search_spec: return symbol->integer_type_name;
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    case search_init: return NULL; /* should never occur */
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  }
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  ERROR; /* should never occur */
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  return NULL;
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}
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/* array_specification [ASSIGN array_initialization} */
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/* array_initialization may be NULL ! */
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void *spec_init_sperator_c::visit(array_spec_init_c *symbol) {
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  TRACE("spec_init_sperator_c::array_spec_init_c");
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  switch (search_what) {
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    case search_spec: return symbol->array_specification;
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    case search_init: return symbol->array_initialization;
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  }
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  return NULL;
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}
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/* ARRAY '[' array_subrange_list ']' OF non_generic_type_name */
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/* NOTE: this symbol may be used directly in implictly defined variables in VAR_TEMP!! 
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 *       so we must consider it here too!
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 */
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void *spec_init_sperator_c::visit(array_specification_c *symbol) {
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  TRACE("spec_init_sperator_c::array_spec_init_c");
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  switch (search_what) {
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    case search_spec: return symbol;
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    case search_init: return NULL;
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  }
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  return NULL;
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}
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181
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/* enumerated_specification ASSIGN enumerated_value */
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void *spec_init_sperator_c::visit(enumerated_spec_init_c *symbol) {
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  TRACE("spec_init_sperator_c::enumerated_spec_init_c");
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  switch (search_what) {
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    case search_spec: return symbol->enumerated_specification;
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    case search_init: return symbol->enumerated_value;
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  }
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  ERROR; /* should never occur */
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  return NULL;
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}
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/* structure_type_name ASSIGN structure_initialization */
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/* structure_initialization may be NULL ! */
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//SYM_REF2(initialized_structure_c, structure_type_name, structure_initialization)
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void *spec_init_sperator_c::visit(initialized_structure_c *symbol) {
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  TRACE("spec_init_sperator_c::initialized_structure_c");
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  switch (search_what) {
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    case search_spec: return symbol->structure_type_name;
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    case search_init: return symbol->structure_initialization;
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  }
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  ERROR; /* should never occur */
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  return NULL;
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}
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/*  function_block_type_name ASSIGN structure_initialization */
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/* structure_initialization -> may be NULL ! */
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//SYM_REF2(fb_spec_init_c, function_block_type_name, structure_initialization)
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void *spec_init_sperator_c::visit(fb_spec_init_c *symbol) {
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  TRACE("spec_init_sperator_c::fb_spec_init_c");
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  switch (search_what) {
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    case search_spec: return symbol->function_block_type_name;
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    case search_init: return symbol->structure_initialization;
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  }
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  ERROR; /* should never occur */
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  return NULL;
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}
181
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/* ref_spec:  REF_TO (non_generic_type_name | function_block_type_name) */
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// SYM_REF1(ref_spec_c, type_name)
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void *spec_init_sperator_c::visit(ref_spec_c *symbol) {
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  TRACE("spec_init_sperator_c::ref_spec_c");
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  /* This visitor should never really be called, but there is no harm in including it... */
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  switch (search_what) {
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    case search_spec: return symbol;
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    case search_init: return NULL; /* should never occur */
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  }
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  ERROR; /* should never occur */
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  return NULL;
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}
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/* For the moment, we do not support initialising reference data types */
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/* ref_spec_init: ref_spec [ ASSIGN ref_initialization ] */ 
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/* NOTE: ref_initialization may be NULL!! */
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// SYM_REF2(ref_spec_init_c, ref_spec, ref_initialization)
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void *spec_init_sperator_c::visit(ref_spec_init_c *symbol) {
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  TRACE("spec_init_sperator_c::ref_spec_init_c");
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  switch (search_what) {
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    case search_spec: return symbol->ref_spec;
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    case search_init: return symbol->ref_initialization;
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  }
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  ERROR; /* should never occur */
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  return NULL;
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}
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/******************************************/
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/* B 1.4.3 - Declaration & Initialisation */
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/******************************************/
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350
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/* STRING '[' integer ']' 
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 * STRING ASSIGN single_byte_character_string
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 * STRING '[' integer ']' ASSIGN single_byte_character_string
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 */
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void *spec_init_sperator_c::visit(single_byte_string_spec_c *symbol) {
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  TRACE("spec_init_sperator_c::single_byte_string_spec_c");
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  switch (search_what) {
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    case search_spec: return symbol->string_spec;
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    case search_init: return symbol->single_byte_character_string;
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  }
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  ERROR; /* should never occur */
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  return NULL;
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}
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/* WSTRING '[' integer ']' 
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 * WSTRING ASSIGN double_byte_character_string
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 * WSTRING '[' integer ']' ASSIGN double_byte_character_string
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 */
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void *spec_init_sperator_c::visit(double_byte_string_spec_c *symbol) {
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  TRACE("spec_init_sperator_c::double_byte_string_spec_c");
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  switch (search_what) {
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    case search_spec: return symbol->string_spec;
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    case search_init: return symbol->double_byte_character_string;
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  }
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  ERROR; /* should never occur */
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  return NULL;
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}
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spec_init_sperator_c *spec_init_sperator_c ::class_instance = NULL;
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spec_init_sperator_c::search_what_t spec_init_sperator_c::search_what;