author | laurent |
Sat, 05 Dec 2009 18:35:38 +0100 | |
changeset 225 | 36d05588f91b |
parent 208 | c72748a12ae3 |
child 258 | d7d92b2f87e9 |
permissions | -rw-r--r-- |
181 | 1 |
/* |
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* (c) 2003 Mario de Sousa |
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* |
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* Offered to the public under the terms of the GNU General Public License |
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* as published by the Free Software Foundation; either version 2 of the |
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* License, or (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, but |
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* WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
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* Public License for more details. |
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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 IL and ST 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 data type of an ST 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 to a int_type_name_c object. |
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* 22.2 - 5 -> returns reference to a real_type_name_c object. |
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* etc... |
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*/ |
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#include "absyntax_utils.hh" |
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#include <typeinfo> |
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search_expression_type_c::search_expression_type_c(symbol_c *search_scope) { |
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search_varfb_instance_type = new search_varfb_instance_type_c(search_scope); |
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} |
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search_expression_type_c::~search_expression_type_c(void) { |
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delete search_varfb_instance_type; |
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} |
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/* A helper function... */ |
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bool search_expression_type_c::is_bool_type(symbol_c *type_symbol) { |
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bool_type_name_c tt; |
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if (type_symbol == NULL) {return true;} |
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return (typeid(*type_symbol) == typeid(bool_type_name_c)); |
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} |
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/* A helper function... */ |
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bool search_expression_type_c::is_time_type(symbol_c *type_symbol) { |
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if (type_symbol == NULL) {return true;} |
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if (typeid(*type_symbol) == typeid(time_type_name_c)) {return true;} |
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if (typeid(*type_symbol) == typeid(date_type_name_c)) {return true;} |
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if (typeid(*type_symbol) == typeid(tod_type_name_c)) {return true;} |
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if (typeid(*type_symbol) == typeid(dt_type_name_c)) {return true;} |
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return false; |
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} |
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65 |
/* A helper function... */ |
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bool search_expression_type_c::is_string_type(symbol_c *type_symbol) { |
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if (type_symbol == NULL) {return true;} |
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if (typeid(*type_symbol) == typeid(string_type_name_c)) {return true;} |
181 | 69 |
if (typeid(*type_symbol) == typeid(wstring_type_name_c)) {return true;} |
70 |
return false; |
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} |
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/* A helper function... */ |
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bool search_expression_type_c::is_literal_integer_type(symbol_c *type_symbol) { |
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if (type_symbol == NULL) {return true;} |
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if (typeid(*type_symbol) == typeid(integer_c)) {return true;} |
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if (typeid(*type_symbol) == typeid(binary_integer_c)) {return true;} |
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if (typeid(*type_symbol) == typeid(octal_integer_c)) {return true;} |
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if (typeid(*type_symbol) == typeid(hex_integer_c)) {return true;} |
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return false; |
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} |
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82 |
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/* A helper function... */ |
181 | 84 |
bool search_expression_type_c::is_integer_type(symbol_c *type_symbol) { |
85 |
if (type_symbol == NULL) {return true;} |
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if (typeid(*type_symbol) == typeid(sint_type_name_c)) {return true;} |
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if (typeid(*type_symbol) == typeid(int_type_name_c)) {return true;} |
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if (typeid(*type_symbol) == typeid(dint_type_name_c)) {return true;} |
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if (typeid(*type_symbol) == typeid(lint_type_name_c)) {return true;} |
181 | 90 |
if (typeid(*type_symbol) == typeid(usint_type_name_c)) {return true;} |
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if (typeid(*type_symbol) == typeid(uint_type_name_c)) {return true;} |
181 | 92 |
if (typeid(*type_symbol) == typeid(udint_type_name_c)) {return true;} |
93 |
if (typeid(*type_symbol) == typeid(ulint_type_name_c)) {return true;} |
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return is_literal_integer_type(type_symbol); |
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} |
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/* A helper function... */ |
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bool search_expression_type_c::is_literal_real_type(symbol_c *type_symbol) { |
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if (type_symbol == NULL) {return true;} |
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if (typeid(*type_symbol) == typeid(real_c)) {return true;} |
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101 |
return false; |
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102 |
} |
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103 |
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104 |
/* A helper function... */ |
181 | 105 |
bool search_expression_type_c::is_real_type(symbol_c *type_symbol) { |
106 |
if (type_symbol == NULL) {return true;} |
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107 |
if (typeid(*type_symbol) == typeid(real_type_name_c)) {return true;} |
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108 |
if (typeid(*type_symbol) == typeid(lreal_type_name_c)) {return true;} |
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return is_literal_real_type(type_symbol); |
181 | 110 |
} |
111 |
||
112 |
bool search_expression_type_c::is_num_type(symbol_c *type_symbol) { |
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113 |
if (type_symbol == NULL) {return true;} |
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114 |
return is_real_type(type_symbol) || is_integer_type(type_symbol); |
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} |
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116 |
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117 |
bool search_expression_type_c::is_nbinary_type(symbol_c *type_symbol) { |
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118 |
if (type_symbol == NULL) {return true;} |
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119 |
if (typeid(*type_symbol) == typeid(byte_type_name_c)) {return true;} |
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120 |
if (typeid(*type_symbol) == typeid(word_type_name_c)) {return true;} |
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if (typeid(*type_symbol) == typeid(dword_type_name_c)) {return true;} |
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122 |
if (typeid(*type_symbol) == typeid(lword_type_name_c)) {return true;} |
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123 |
return is_literal_integer_type(type_symbol); |
181 | 124 |
} |
125 |
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126 |
bool search_expression_type_c::is_binary_type(symbol_c *type_symbol) { |
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127 |
if (type_symbol == NULL) {return true;} |
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128 |
if (typeid(*type_symbol) == typeid(bool_type_name_c)) {return true;} |
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129 |
return is_nbinary_type(type_symbol); |
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130 |
} |
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131 |
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132 |
bool search_expression_type_c::is_same_type(symbol_c *first_type, symbol_c *second_type) { |
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133 |
if (first_type == NULL || second_type == NULL) {return true;} |
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if (typeid(*first_type) == typeid(*second_type)) {return true;} |
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if (is_integer_type(first_type) && is_literal_integer_type(second_type)) {return true;} |
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if (is_literal_integer_type(first_type) && is_integer_type(second_type)) {return true;} |
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if (is_binary_type(first_type) && is_literal_integer_type(second_type)) {return true;} |
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if (is_literal_integer_type(first_type) && is_binary_type(second_type)) {return true;} |
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if (is_real_type(first_type) && is_literal_real_type(second_type)) {return true;} |
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140 |
if (is_literal_real_type(first_type) && is_real_type(second_type)) {return true;} |
181 | 141 |
return false; |
142 |
} |
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143 |
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144 |
symbol_c* search_expression_type_c::common_type(symbol_c *first_type, symbol_c *second_type) { |
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145 |
if (first_type == NULL && second_type == NULL) {return NULL;} |
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146 |
if (first_type == NULL) {return second_type;} |
|
147 |
if (second_type == NULL) {return first_type;} |
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148 |
if (typeid(*first_type) == typeid(*second_type)) {return first_type;} |
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149 |
if (is_integer_type(first_type) && is_literal_integer_type(second_type)) {return first_type;} |
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150 |
if (is_literal_integer_type(first_type) && is_integer_type(second_type)) {return second_type;} |
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151 |
if (is_binary_type(first_type) && is_literal_integer_type(second_type)) {return first_type;} |
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152 |
if (is_literal_integer_type(first_type) && is_binary_type(second_type)) {return second_type;} |
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153 |
if (is_real_type(first_type) && is_literal_real_type(second_type)) {return first_type;} |
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154 |
if (is_literal_real_type(first_type) && is_real_type(second_type)) {return second_type;} |
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155 |
return NULL; |
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156 |
} |
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157 |
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158 |
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159 |
integer_c search_expression_type_c::integer("1"); // what default value should we use here ??? |
181 | 160 |
#include "search_type_code.c" |
161 |
||
162 |
/*static bool_type_name_c bool_type_name;*/ |
|
163 |
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164 |
/* A helper function... */ |
|
165 |
void *search_expression_type_c::compute_boolean_expression(symbol_c *left_type, symbol_c *right_type) { |
|
166 |
if (!is_same_type(left_type, right_type)) |
|
167 |
ERROR; |
|
168 |
if (!is_bool_type(left_type) && !is_binary_type(left_type)) |
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169 |
ERROR; |
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170 |
if (is_literal_integer_type(left_type)) {return (void *)right_type;} |
181 | 171 |
else {return (void *)left_type;} |
172 |
} |
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173 |
||
174 |
/* A helper function... */ |
|
175 |
void *search_expression_type_c::compute_numeric_expression(symbol_c *left_type, symbol_c *right_type) { |
|
176 |
if (!is_same_type(left_type, right_type)) |
|
177 |
ERROR; |
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178 |
if (!is_integer_type(left_type) && !is_real_type(left_type)) |
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179 |
ERROR; |
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180 |
if (is_literal_integer_type(left_type) || is_literal_real_type(left_type)) {return (void *)right_type;} |
181 | 181 |
else {return (void *)left_type;} |
182 |
return NULL; |
|
183 |
} |
|
184 |
||
185 |
/* a helper function... */ |
|
186 |
symbol_c *search_expression_type_c::base_type(symbol_c *symbol) { |
|
187 |
return (symbol_c *)symbol->accept(search_base_type); |
|
188 |
} |
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189 |
||
190 |
/*********************/ |
|
191 |
/* B 1.4 - Variables */ |
|
192 |
/*********************/ |
|
193 |
||
194 |
void *search_expression_type_c::visit(symbolic_variable_c *symbol) { |
|
195 |
symbol_c *res; |
|
196 |
||
197 |
/* Nope, now we assume it is a variable, and determine its type... */ |
|
198 |
res = search_varfb_instance_type->get_type(symbol); |
|
199 |
if (NULL != res) return res; |
|
200 |
||
201 |
return NULL; |
|
202 |
} |
|
203 |
||
204 |
/********************************************/ |
|
205 |
/* B 1.4.1 - Directly Represented Variables */ |
|
206 |
/********************************************/ |
|
207 |
void *search_expression_type_c::visit(direct_variable_c *symbol) { |
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symbol_c *res; |
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209 |
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210 |
/* Nope, now we assume it is a variable, and determine its type... */ |
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211 |
res = search_varfb_instance_type->get_type(symbol); |
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212 |
if (NULL != res) return res; |
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214 |
return NULL; |
181 | 215 |
} |
216 |
||
217 |
/*************************************/ |
|
218 |
/* B 1.4.2 - Multi-element variables */ |
|
219 |
/*************************************/ |
|
220 |
||
221 |
void *search_expression_type_c::visit(array_variable_c *symbol) { |
|
222 |
symbol_c *res; |
|
223 |
||
224 |
/* Nope, now we assume it is a variable, and determine its type... */ |
|
225 |
res = search_varfb_instance_type->get_type(symbol); |
|
226 |
if (NULL != res) return res; |
|
227 |
||
228 |
return NULL; |
|
229 |
} |
|
230 |
||
231 |
void *search_expression_type_c::visit(structured_variable_c *symbol) { |
|
232 |
symbol_c *res; |
|
233 |
||
234 |
/* Nope, now we assume it is a variable, and determine its type... */ |
|
235 |
res = search_varfb_instance_type->get_type(symbol); |
|
236 |
if (NULL != res) return res; |
|
237 |
||
238 |
return NULL; |
|
239 |
} |
|
240 |
||
241 |
/***************************************/ |
|
242 |
/* B.3 - Language ST (Structured Text) */ |
|
243 |
/***************************************/ |
|
244 |
/***********************/ |
|
245 |
/* B 3.1 - Expressions */ |
|
246 |
/***********************/ |
|
247 |
void *search_expression_type_c::visit(or_expression_c *symbol) { |
|
248 |
symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this)); |
|
249 |
symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this)); |
|
250 |
return compute_boolean_expression(left_type, right_type); |
|
251 |
} |
|
252 |
||
253 |
void *search_expression_type_c::visit(xor_expression_c *symbol) { |
|
254 |
symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this)); |
|
255 |
symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this)); |
|
256 |
return compute_boolean_expression(left_type, right_type); |
|
257 |
} |
|
258 |
||
259 |
void *search_expression_type_c::visit(and_expression_c *symbol) { |
|
260 |
symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this)); |
|
261 |
symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this)); |
|
262 |
return compute_boolean_expression(left_type, right_type); |
|
263 |
} |
|
264 |
||
265 |
void *search_expression_type_c::visit(equ_expression_c *symbol) {return (void *)&bool_type_name;} |
|
266 |
void *search_expression_type_c::visit(notequ_expression_c *symbol) {return (void *)&bool_type_name;} |
|
267 |
void *search_expression_type_c::visit(lt_expression_c *symbol) {return (void *)&bool_type_name;} |
|
268 |
void *search_expression_type_c::visit(gt_expression_c *symbol) {return (void *)&bool_type_name;} |
|
269 |
void *search_expression_type_c::visit(le_expression_c *symbol) {return (void *)&bool_type_name;} |
|
270 |
void *search_expression_type_c::visit(ge_expression_c *symbol) {return (void *)&bool_type_name;} |
|
271 |
||
272 |
void *search_expression_type_c::visit(add_expression_c *symbol) { |
|
273 |
symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this)); |
|
274 |
symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this)); |
|
275 |
if (typeid(*left_type) == typeid(time_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) {return (void *)&time_type_name;} |
|
276 |
if (typeid(*left_type) == typeid(tod_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) {return (void *)&tod_type_name;} |
|
277 |
if (typeid(*left_type) == typeid(dt_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) {return (void *)&dt_type_name;} |
|
278 |
return compute_numeric_expression(left_type, right_type); |
|
279 |
} |
|
280 |
||
281 |
void *search_expression_type_c::visit(sub_expression_c *symbol) { |
|
282 |
symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this)); |
|
283 |
symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this)); |
|
284 |
if (typeid(*left_type) == typeid(time_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) {return (void *)&time_type_name;} |
|
285 |
if (typeid(*left_type) == typeid(date_type_name_c) && typeid(*right_type) == typeid(date_type_name_c)) {return (void *)&time_type_name;} |
|
286 |
if (typeid(*left_type) == typeid(tod_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) {return (void *)&tod_type_name;} |
|
287 |
if (typeid(*left_type) == typeid(tod_type_name_c) && typeid(*right_type) == typeid(tod_type_name_c)) {return (void *)&time_type_name;} |
|
288 |
if (typeid(*left_type) == typeid(dt_type_name_c) && typeid(*right_type) == typeid(time_type_name_c)) {return (void *)&dt_type_name;} |
|
289 |
if (typeid(*left_type) == typeid(dt_type_name_c) && typeid(*right_type) == typeid(dt_type_name_c)) {return (void *)&time_type_name;} |
|
290 |
return compute_numeric_expression(left_type, right_type); |
|
291 |
} |
|
292 |
||
293 |
void *search_expression_type_c::visit(mul_expression_c *symbol) { |
|
294 |
symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this)); |
|
295 |
symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this)); |
|
296 |
if (typeid(*left_type) == typeid(time_type_name_c) && is_num_type(right_type)) { |
|
297 |
return (void *)&time_type_name; |
|
298 |
} |
|
299 |
return compute_numeric_expression(left_type, right_type); |
|
300 |
} |
|
301 |
||
302 |
void *search_expression_type_c::visit(div_expression_c *symbol) { |
|
303 |
symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this)); |
|
304 |
symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this)); |
|
305 |
if (typeid(*left_type) == typeid(time_type_name_c) && is_num_type(right_type)){ |
|
306 |
return (void *)&time_type_name; |
|
307 |
} |
|
308 |
return compute_numeric_expression(left_type, right_type); |
|
309 |
} |
|
310 |
||
311 |
void *search_expression_type_c::visit(mod_expression_c *symbol) { |
|
312 |
symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this)); |
|
313 |
symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this)); |
|
314 |
return compute_numeric_expression(left_type, right_type); |
|
315 |
} |
|
316 |
||
317 |
void *search_expression_type_c::visit(power_expression_c *symbol) { |
|
318 |
symbol_c *left_type = base_type((symbol_c *)symbol->l_exp->accept(*this)); |
|
319 |
symbol_c *right_type = base_type((symbol_c *)symbol->r_exp->accept(*this)); |
|
320 |
if (is_real_type(left_type) && is_num_type(right_type)) { |
|
321 |
return (void *)left_type; |
|
322 |
} |
|
323 |
ERROR; |
|
324 |
return NULL; |
|
325 |
} |
|
326 |
||
327 |
void *search_expression_type_c::visit(neg_expression_c *symbol) { |
|
328 |
symbol_c *exp_type = base_type((symbol_c *)symbol->exp->accept(*this)); |
|
329 |
if (is_num_type(exp_type) || typeid(*exp_type) == typeid(time_type_name_c)){ |
|
330 |
return (void *)exp_type; |
|
331 |
} |
|
332 |
ERROR; |
|
333 |
return NULL; |
|
334 |
} |
|
335 |
||
336 |
void *search_expression_type_c::visit(not_expression_c *symbol) { |
|
337 |
symbol_c *exp_type = base_type((symbol_c *)symbol->exp->accept(*this)); |
|
338 |
return compute_boolean_expression(exp_type, exp_type); |
|
339 |
} |
|
340 |
||
341 |
void *search_expression_type_c::visit(function_invocation_c *symbol) { |
|
342 |
function_declaration_c *f_decl = function_symtable.find_value(symbol->function_name); |
|
343 |
if (f_decl == function_symtable.end_value()) { |
|
344 |
void *res = compute_standard_function_default(symbol); |
|
345 |
if (res == NULL) |
|
346 |
ERROR; |
|
347 |
return res; |
|
348 |
} |
|
349 |
return base_type(f_decl->type_name); |
|
350 |
} |
|
351 |
||
352 |
/*bool_type_name_c search_expression_type_c::bool_type_name;*/ |
|
353 |