/*
* matiec - a compiler for the programming languages defined in IEC 61131-3
*
* Copyright (C) 2009-2011 Mario de Sousa (msousa@fe.up.pt)
* Copyright (C) 2007-2011 Laurent Bessard and Edouard Tisserant
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*
* This code is made available on the understanding that it will not be
* used in safety-critical situations without a full and competent review.
*/
/*
* An IEC 61131-3 compiler.
*
* Based on the
* FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
*
*/
/*
* This is the main stage 3a file.
*
* In stage 3a some helpful symbol tables are instanciated and populated.
* These symbol tables wll then be used by stage3b and atage4 code generators.
*/
// #include <stdio.h> /* required for NULL */
#include <string>
#include <iostream>
#include <sstream>
#include <typeinfo>
#include <list>
#include <strings.h>
#include "../util/symtable.hh"
#include "../util/dsymtable.hh"
#include "../absyntax/visitor.hh"
//#define DEBUG
#ifdef DEBUG
#define TRACE(classname) printf("\n____%s____\n",classname);
#else
#define TRACE(classname)
#endif
#define ERROR error_exit(__FILE__,__LINE__)
/* function defined in main.cc */
extern void error_exit(const char *file_name, int line_no);
/***********************************************************************/
/***********************************************************************/
/***********************************************************************/
/***********************************************************************/
/* returns 0 if the names are equal!! */
/* NOTE: it must ignore case!! */
int compare_identifiers(symbol_c *ident1, symbol_c *ident2) {
token_c *name1 = dynamic_cast<token_c *>(ident1);
token_c *name2 = dynamic_cast<token_c *>(ident2);
if ((name1 == NULL) || (name2 == NULL))
/* invalid identifiers... */
return -1;
if (strcasecmp(name1->value, name2->value) == 0)
return 0;
/* identifiers do not match! */
return 1;
}
/***********************************************************************/
/***********************************************************************/
/***********************************************************************/
/***********************************************************************/
/* A symbol table with all globally declared functions... */
function_declaration_c null_symbol1(NULL,NULL,NULL,NULL);
dsymtable_c<function_declaration_c *, &null_symbol1> function_symtable;
/* A symbol table with all globally declared functions block types... */
function_block_declaration_c null_symbol2(NULL,NULL,NULL);
symtable_c<function_block_declaration_c *, &null_symbol2> function_block_type_symtable;
/* A symbol table with all globally declared program types... */
program_declaration_c null_symbol3(NULL,NULL,NULL);
symtable_c<program_declaration_c *, &null_symbol3> program_type_symtable;
/* A symbol table with all user declared type definitions... */
/* Note that function block types and program types have their
* own symbol tables, so do not get placed in this symbol table!
*
* The symbol_c * associated to the value will point to the data type declaration.
*/
symbol_c null_symbol4;
symtable_c<symbol_c *, &null_symbol4> type_symtable;
/* A symbol table with all values declared for enumerated type... */
/* Notes:
* - if the value is defined multiple times the value
* is the null pointer.
*
* - The stored symbol_c * associated to the value points to the enumerated_type_name
* (i.e. the name of the enumerated data type) in which the the value/identifier
* is used/declared.
*
* - We could re-use the null_symbol4 object, but it is safer to use a distinct object
* (i.e. it might make it easier to find strange bugs).
*/
symbol_c null_symbol5;
symtable_c<symbol_c *, &null_symbol5> enumerated_value_symtable;
/***********************************************************************/
/***********************************************************************/
/***********************************************************************/
/***********************************************************************/
class populate_symtables_c: public iterator_visitor_c {
private:
symbol_c *current_enumerated_type;
public:
populate_symtables_c(void) {
current_enumerated_type = NULL;
};
virtual ~populate_symtables_c(void) {}
public:
/*************************/
/* B.1 - Common elements */
/*************************/
/*******************************************/
/* B 1.1 - Letters, digits and identifiers */
/*******************************************/
/*********************/
/* B 1.2 - Constants */
/*********************/
/******************************/
/* B 1.2.1 - Numeric Literals */
/******************************/
/*******************************/
/* B.1.2.2 Character Strings */
/*******************************/
/***************************/
/* B 1.2.3 - Time Literals */
/***************************/
/************************/
/* B 1.2.3.1 - Duration */
/************************/
/************************************/
/* B 1.2.3.2 - Time of day and Date */
/************************************/
/**********************/
/* B.1.3 - Data types */
/**********************/
/***********************************/
/* B 1.3.1 - Elementary Data Types */
/***********************************/
/********************************/
/* B.1.3.2 - Generic data types */
/********************************/
/********************************/
/* B 1.3.3 - Derived data types */
/********************************/
/* subrange_type_name ':' subrange_spec_init */
void *visit(subrange_type_declaration_c *symbol) {
TRACE("subrange_type_declaration_c");
type_symtable.insert(symbol->subrange_type_name, symbol->subrange_spec_init);
return NULL;
}
/* enumerated_type_name ':' enumerated_spec_init */
void *visit(enumerated_type_declaration_c *symbol) {
TRACE("enumerated_type_declaration_c");
type_symtable.insert(symbol->enumerated_type_name, symbol->enumerated_spec_init);
current_enumerated_type = symbol->enumerated_type_name;
symbol->enumerated_spec_init->accept(*this);
current_enumerated_type = NULL;
return NULL;
}
/* enumerated_specification ASSIGN enumerated_value */
void *visit(enumerated_spec_init_c *symbol) {
return symbol->enumerated_specification->accept(*this);
}
/* [enumerated_type_name '#'] identifier */
void *visit(enumerated_value_c *symbol) {
if (current_enumerated_type != NULL) {
if (symbol->type != NULL) ERROR;
symbol_c *value_type = enumerated_value_symtable.find_value(symbol->value);
/* NOTE: The following condition checks whether the same identifier is used more than once
* when defining the enumerated values of the type declaration of the new enumerated type.
* If this occurs, then the program beeing compiled contains a semantic error, which
* must be caught and reported by the semantic analyser. However, since
* this code is run before the semantic analyser, we must not yet raise the ERROR (internal
* compiler error message).
* For this reason, the follosing check is commented out.
*/
/* if (value_type == current_enumerated_type) ERROR; */
if (value_type == enumerated_value_symtable.end_value())
/* This identifier has not yet been used in any previous declaration of an enumeration data type.
* so we add it to the symbol table.
*/
enumerated_value_symtable.insert(symbol->value, current_enumerated_type);
else if (value_type != NULL)
/* This identifier has already been used in a previous declaration of an enumeration data type.
* so we set the symbol in symbol table pointing to NULL.
*/
enumerated_value_symtable.set(symbol->value, NULL);
}
return NULL;
}
/* identifier ':' array_spec_init */
void *visit(array_type_declaration_c *symbol) {
TRACE("array_type_declaration_c");
type_symtable.insert(symbol->identifier, symbol->array_spec_init);
return NULL;
}
/* simple_type_name ':' simple_spec_init */
void *visit(simple_type_declaration_c *symbol) {
TRACE("simple_type_declaration_c");
type_symtable.insert(symbol->simple_type_name, symbol->simple_spec_init);
return NULL;
}
/* structure_type_name ':' structure_specification */
void *visit(structure_type_declaration_c *symbol) {
TRACE("structure_type_declaration_c");
type_symtable.insert(symbol->structure_type_name, symbol->structure_specification);
return NULL;
}
/*********************/
/* B 1.4 - Variables */
/*********************/
/********************************************/
/* B.1.4.1 Directly Represented Variables */
/********************************************/
/*************************************/
/* B.1.4.2 Multi-element Variables */
/*************************************/
/******************************************/
/* B 1.4.3 - Declaration & Initialisation */
/******************************************/
/**************************************/
/* B.1.5 - Program organization units */
/**************************************/
/***********************/
/* B 1.5.1 - Functions */
/***********************/
public:
/* FUNCTION derived_function_name ':' elementary_type_name io_OR_function_var_declarations_list function_body END_FUNCTION */
/* | FUNCTION derived_function_name ':' derived_type_name io_OR_function_var_declarations_list function_body END_FUNCTION */
void *visit(function_declaration_c *symbol) {
TRACE("function_declaration_c");
function_symtable.insert(symbol->derived_function_name, symbol);
/* symbol->derived_function_name->accept(*this); */ /* Function name */
/* symbol->type_name->accept(*this); */ /* return data type */
/* symbol->var_declarations_list->accept(*this); */ /* Function parameters and variables */
/* symbol->function_body->accept(*this); */ /* Function body */
return NULL;
}
/*****************************/
/* B 1.5.2 - Function Blocks */
/*****************************/
public:
/* FUNCTION_BLOCK derived_function_block_name io_OR_other_var_declarations function_block_body END_FUNCTION_BLOCK */
//SYM_REF4(function_block_declaration_c, fblock_name, var_declarations, fblock_body, unused)
void *visit(function_block_declaration_c *symbol) {
TRACE("function_block_declaration_c");
function_block_type_symtable.insert(symbol->fblock_name, symbol);
/*
symbol->fblock_name->accept(*this);
symbol->var_declarations->accept(*this);
symbol->fblock_body->accept(*this);
*/
return NULL;
}
/**********************/
/* B 1.5.3 - Programs */
/**********************/
public:
/* PROGRAM program_type_name program_var_declarations_list function_block_body END_PROGRAM */
//SYM_REF4(program_declaration_c, program_type_name, var_declarations, function_block_body, unused)
void *visit(program_declaration_c *symbol) {
TRACE("program_declaration_c");
program_type_symtable.insert(symbol->program_type_name, symbol);
/*
symbol->program_type_name->accept(*this);
symbol->var_declarations->accept(*this);
symbol->function_block_body->accept(*this);
*/
return NULL;
}
}; /* populate_symtables_c */
void absyntax_utils_init(symbol_c *tree_root) {
populate_symtables_c populate_symbols;
tree_root->accept(populate_symbols);
}