author | tib |
Fri, 09 Feb 2007 08:26:32 +0100 | |
changeset 12 | f01522b04810 |
parent 0 | fb772792efd1 |
child 32 | 289256ec66f1 |
permissions | -rwxr-xr-x |
0
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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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/* |
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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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/* |
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* Declare temporary variables to be later used as output parameters |
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* in function calls for which not all output parameters were |
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* defined in the original (st or il) source code. |
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* |
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* This is part of the 4th stage that generates |
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* a c++ source program equivalent to the IL and ST |
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* code. |
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*/ |
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class temp_var_name_c { |
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private: |
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int counter; |
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public: |
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void reset(void) {counter = 0;} |
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temp_var_name_c(void) {reset();} |
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public: |
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std::string *new_name(void) { |
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std::string *new_str = new std::string(TEMP_VAR); |
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/* yikes!!! How to convert an int to a string elegantly??? |
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* Right now I (Mario) can only think of snprintf() |
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* C++ must have a more elegant method! |
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*/ |
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int int_str_size = snprintf(NULL, 0, "%d", counter); |
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if (int_str_size <= 0) ERROR; |
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char *int_str = (char *)malloc(int_str_size+1); |
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if (snprintf(int_str, int_str_size+1, "%d", counter++) >= int_str_size+1) ERROR; |
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*new_str += int_str; |
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free(int_str); |
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return new_str; |
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} |
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}; |
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/***********************************************************************/ |
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/***********************************************************************/ |
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/***********************************************************************/ |
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/***********************************************************************/ |
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|
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/* Some function calls in the body of functions or function blocks |
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* may leave some parameters to their default values, and |
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* ignore some output parameters of the function being called. |
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* Our conversion of ST functions to C++ does not contemplate that, |
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* i.e. each called function must get all it's input and output |
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* parameters set correctly. |
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* For input parameters we merely need to call the function with |
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* the apropriate default value, but for output parameters |
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* we must create temporary variables to hold the output value. |
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* |
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* We declare all the temporary output variables at the begining of |
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* the body of each function or function block, and use them as |
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* in function calls later on as they become necessary... |
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* Note that we cannot create these variables just before a function |
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* call, as the function call itself may be integrated within an |
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* expression, or another function call! |
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* |
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* The variables are declared in the exact same order in which they |
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* will be used later on during the function calls, which allows us |
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* to simply re-create the name that was used for the temporary variable |
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* instead of keeping it in some list. |
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* The names are recreated by the temp_var_name_factory, after reset() |
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* has been called! |
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* |
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* This function will genertae code similar to... |
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* |
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* INT __TMP_0 = 23; |
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* REAL __TMP_1 = 45.5; |
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* ... |
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*/ |
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|
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class generate_cc_tempvardecl_c: generate_cc_typedecl_c { |
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public: |
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generate_cc_tempvardecl_c(stage4out_c *s4o_ptr): generate_cc_typedecl_c(s4o_ptr) {} |
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108 |
|
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void generate(symbol_c *body, temp_var_name_c *temp_var_name_factory) { |
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temp_var_name_factory->reset(); |
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function_call_iterator_c fcall_iterator(body); |
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for(symbol_c *finvocation = NULL; (finvocation = fcall_iterator.next()) != NULL;) { |
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/* get the name of the next function that gets called */ |
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identifier_c *fcalled_name = fcall_iterator.fname(); |
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/* get that function's declaration... */ |
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function_declaration_c *fdecl = function_symtable.find_value(fcalled_name); |
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117 |
if (fdecl == function_symtable.end_value()) ERROR; |
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118 |
/* create iterator to iterate through each of the called function's parameters... */ |
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119 |
function_param_iterator_c fp_iterator(fdecl); |
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120 |
|
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/* iterate through each of the called function's parameters... */ |
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122 |
identifier_c *param_name = NULL; |
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123 |
function_call_param_iterator_c function_call_param_iterator(finvocation); |
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for(int i = 1; (param_name = fp_iterator.next()) != NULL; i++) { |
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125 |
|
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function_param_iterator_c::param_direction_t param_direction = fp_iterator.param_direction(); |
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if (param_direction == function_param_iterator_c::direction_in) |
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128 |
/* ignore input only parameters... |
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129 |
* we do not need to create temporary variables for these! |
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130 |
*/ |
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131 |
continue; |
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132 |
|
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133 |
/* Get the value from a foo(<param_name> = <param_value>) style call */ |
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134 |
symbol_c *param_value = function_call_param_iterator.search(param_name); |
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135 |
|
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136 |
/* Get the value from a foo(<param_value>) style call */ |
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137 |
if (param_value == NULL) |
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param_value = function_call_param_iterator.next(); |
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139 |
|
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140 |
if (param_value != NULL) |
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141 |
/* ignore output parameters to which a variable is passed... |
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142 |
* we do not need to create temporary variables for these! |
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143 |
*/ |
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144 |
continue; |
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145 |
|
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symbol_c *param_type = fp_iterator.param_type(); |
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147 |
|
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148 |
/* get the parameter's default value */ |
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149 |
param_value = fp_iterator.default_value(); |
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150 |
|
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151 |
/* If no default value specified in function declaration, |
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152 |
* get the default value of this variable's type |
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153 |
*/ |
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if (param_value == NULL) |
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param_value = (symbol_c *)param_type->accept(*type_initial_value_c::instance()); |
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156 |
if (param_value == NULL) ERROR; |
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157 |
|
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158 |
/* now declare a temporary variable, with the correct default value... */ |
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159 |
s4o.print(s4o.indent_spaces); |
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param_type->accept(*this); |
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161 |
s4o.print(" "); |
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162 |
|
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std::string *temp_var_name = temp_var_name_factory->new_name(); |
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s4o.print(*temp_var_name); |
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165 |
delete temp_var_name; |
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166 |
|
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s4o.print(" = "); |
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param_value->accept(*this); |
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169 |
s4o.print(";\n"); |
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170 |
} |
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} |
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temp_var_name_factory->reset(); |
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s4o.print("\n"); |
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174 |
} |
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175 |
}; |