diff -r 64334c5a00b1 -r 38d6eb056260 absyntax_utils/absyntax_utils.cc --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/absyntax_utils/absyntax_utils.cc Mon Jun 01 21:08:44 2009 +0200 @@ -0,0 +1,290 @@ +/* + * (c) 2009 Mario de Sousa + * + * Offered to the public under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 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. + * + * 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 IL and ST 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 /* required for NULL */ +#include +#include +#include +#include +#include +#include + +#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(ident1); + token_c *name2 = dynamic_cast(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_symtable; + +/* A symbol table with all globally declared functions block types... */ +function_block_declaration_c null_symbol2(NULL,NULL,NULL); +symtable_c function_block_type_symtable; + +/* A symbol table with all globally declared program types... */ +program_declaration_c null_symbol3(NULL,NULL,NULL); +symtable_c 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! + */ +symbol_c null_symbol4; +symtable_c type_symtable; + + + +/***********************************************************************/ +/***********************************************************************/ +/***********************************************************************/ +/***********************************************************************/ + + +class populate_symtables_c: public iterator_visitor_c { + + public: + populate_symtables_c(void) {}; + 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); + 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); +} +