diff -r bd5998ee8876 -r ff4d26b7e51d stage3/flow_control_analysis.cc --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/stage3/flow_control_analysis.cc Thu Feb 16 10:27:52 2012 +0000 @@ -0,0 +1,185 @@ +/* + * matiec - a compiler for the programming languages defined in IEC 61131-3 + * + * Copyright (C) 2012 Mario de Sousa (msousa@fe.up.pt) + * + * 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 . + * + * + * 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) + * + */ + + +/* + * Do flow control analysis of the IEC 61131-3 code. + * + * We currently only do this for IL code. + * This class will annotate the abstract syntax tree, by filling in the + * prev_il_instruction variable in the il_instruction_c, so it points to + * the previous il_instruction_c object in the instruction list instruction_list_c. + */ + +#include "flow_control_analysis.hh" + + + +/* set to 1 to see debug info during execution */ +static int debug = 0; + +flow_control_analysis_c::flow_control_analysis_c(symbol_c *ignore) { +} + +flow_control_analysis_c::~flow_control_analysis_c(void) { +} + + + +/************************************/ +/* B 1.5 Program organization units */ +/************************************/ +/*********************/ +/* B 1.5.1 Functions */ +/*********************/ +void *flow_control_analysis_c::visit(function_declaration_c *symbol) { + search_varfb_instance_type = new search_varfb_instance_type_c(symbol); + if (debug) printf("Doing flow control analysis in body of function %s\n", ((token_c *)(symbol->derived_function_name))->value); + symbol->function_body->accept(*this); + delete search_varfb_instance_type; + search_varfb_instance_type = NULL; + return NULL; +} + +/***************************/ +/* B 1.5.2 Function blocks */ +/***************************/ +void *flow_control_analysis_c::visit(function_block_declaration_c *symbol) { + search_varfb_instance_type = new search_varfb_instance_type_c(symbol); + if (debug) printf("Doing flow control analysis in body of FB %s\n", ((token_c *)(symbol->fblock_name))->value); + symbol->fblock_body->accept(*this); + delete search_varfb_instance_type; + search_varfb_instance_type = NULL; + return NULL; +} + +/********************/ +/* B 1.5.3 Programs */ +/********************/ +void *flow_control_analysis_c::visit(program_declaration_c *symbol) { + search_varfb_instance_type = new search_varfb_instance_type_c(symbol); + if (debug) printf("Doing flow control analysis in body of program %s\n", ((token_c *)(symbol->program_type_name))->value); + symbol->function_block_body->accept(*this); + delete search_varfb_instance_type; + search_varfb_instance_type = NULL; + return NULL; +} + + +/********************************/ +/* B 1.7 Configuration elements */ +/********************************/ +void *flow_control_analysis_c::visit(configuration_declaration_c *symbol) { + return NULL; +} + + +/****************************************/ +/* B.2 - Language IL (Instruction List) */ +/****************************************/ +/***********************************/ +/* B 2.1 Instructions and Operands */ +/***********************************/ + +/*| instruction_list il_instruction */ +// SYM_LIST(instruction_list_c) +void *flow_control_analysis_c::visit(instruction_list_c *symbol) { + for(int i = 1; i < symbol->n; i++) { + prev_il_instruction = symbol->elements[i-1]; + symbol->elements[i]->accept(*this); + } + return NULL; +} + +/* | label ':' [il_incomplete_instruction] eol_list */ +// SYM_REF2(il_instruction_c, label, il_instruction) +// void *visit(instruction_list_c *symbol); +void *flow_control_analysis_c::visit(il_instruction_c *symbol) { + symbol->prev_il_instruction = prev_il_instruction; + /* TODO: handle labels correctly! + * + * Don't forget to handle multiple consecutive lables too! + * label2: + * label3: + * label4: + * LD I + */ + +return NULL; +} + + +#if 0 +/* | function_name [il_operand_list] */ +/* NOTE: The parameters 'called_function_declaration' and 'extensible_param_count' are used to pass data between the stage 3 and stage 4. */ +// SYM_REF2(il_function_call_c, function_name, il_operand_list, symbol_c *called_function_declaration; int extensible_param_count;) +void *flow_control_analysis_c::visit(il_function_call_c *symbol) { + return NULL; +} + +/* | il_expr_operator '(' [il_operand] eol_list [simple_instr_list] ')' */ +// SYM_REF3(il_expression_c, il_expr_operator, il_operand, simple_instr_list); +void *flow_control_analysis_c::visit(il_expression_c *symbol) { +return NULL; +} + +/* il_call_operator prev_declared_fb_name + * | il_call_operator prev_declared_fb_name '(' ')' + * | il_call_operator prev_declared_fb_name '(' eol_list ')' + * | il_call_operator prev_declared_fb_name '(' il_operand_list ')' + * | il_call_operator prev_declared_fb_name '(' eol_list il_param_list ')' + */ +/* 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 */ +// SYM_REF4(il_fb_call_c, il_call_operator, fb_name, il_operand_list, il_param_list, symbol_c *called_fb_declaration) +void *flow_control_analysis_c::visit(il_fb_call_c *symbol) { + return NULL; +} + + +/* | function_name '(' eol_list [il_param_list] ')' */ +/* NOTE: The parameter 'called_function_declaration' is used to pass data between the stage 3 and stage 4. */ +// SYM_REF2(il_formal_funct_call_c, function_name, il_param_list, symbol_c *called_function_declaration; int extensible_param_count;) +void *flow_control_analysis_c::visit(il_formal_funct_call_c *symbol) { + return NULL; +} + + +/* + void *visit(il_operand_list_c *symbol); + void *visit(simple_instr_list_c *symbol); + void *visit(il_param_list_c *symbol); + void *visit(il_param_assignment_c *symbol); + void *visit(il_param_out_assignment_c *symbol); + */ + + +#endif +