author | Mario de Sousa <msousa@fe.up.pt> |
Mon, 16 Apr 2012 15:27:53 +0100 | |
changeset 513 | 99aa36a77703 |
parent 505 | 21be0f2f242d |
child 531 | e7d6f28fc882 |
permissions | -rwxr-xr-x |
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/* |
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* matiec - a compiler for the programming languages defined in IEC 61131-3 |
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* |
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* Copyright (C) 2003-2012 Mario de Sousa (msousa@fe.up.pt) |
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* Copyright (C) 2007-2011 Laurent Bessard and Edouard Tisserant |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, either version 3 of the License, or |
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* (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, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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* |
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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 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 a variable. |
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* The variable may be a simple variable, a function block instance, a |
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* struture element within a data structured type (a struct or a fb), or |
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* an array element. |
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* A mixture of array element of a structure element of a structure element |
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* of a .... is also suported! |
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* |
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* example: |
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* window.points[1].coordinate.x |
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* window.points[1].colour |
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* etc... ARE ALLOWED! |
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* |
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* This class must be passed the scope within which the |
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* variable was declared, and the variable name... |
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* |
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* |
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* |
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* |
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* |
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* This class has several members, depending on the exact data the caller |
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* is looking for... |
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* |
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* - item i: we can get either the name of the data type(A), |
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* or it's declaration (B) |
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* (notice however that some variables belong to a data type that does |
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* not have a name, only a declaration as in |
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* VAR a: ARRAY [1..3] of INT; END_VAR |
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* ) |
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* - item ii: we can get either the direct data type (1), |
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* or the base type (2) |
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* |
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* By direct type, I mean the data type of the variable. By base type, I |
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* mean the data type on which the direct type is based on. For example, in |
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* a subrange on INT, the direct type is the subrange itself, while the |
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* base type is INT. |
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* e.g. |
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* This means that if we find that the variable is of type MY_INT, |
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* which was previously declared to be |
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* TYPE MY_INT: INT := 9; |
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* option (1) will return MY_INT |
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* option (2) will return INT |
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* |
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* |
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* Member functions: |
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* ================ |
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* get_basetype_id() ---> returns 2A (implemented, although currently it is not needed! ) |
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* get_basetype_decl() ---> returns 2B |
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* get_type_id() ---> returns 1A |
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* |
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* Since we haven't yet needed it, we don't yet implement |
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* get_type_decl() ---> returns 1B |
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*/ |
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class search_varfb_instance_type_c : null_visitor_c { |
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private: |
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search_var_instance_decl_c search_var_instance_decl; |
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search_base_type_c search_base_type; |
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// symbol_c *current_type_decl; |
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symbol_c *current_type_id; |
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symbol_c *current_basetype_decl; |
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symbol_c *current_basetype_id; |
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symbol_c *current_field_selector; |
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bool is_complex; |
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/* sets all the above variables to NULL, or false */ |
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void init(void); |
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public: |
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search_varfb_instance_type_c(symbol_c *search_scope); |
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symbol_c *get_basetype_decl(symbol_c *variable_name); |
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symbol_c *get_basetype_id (symbol_c *variable_name); |
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// symbol_c *get_type_decl(symbol_c *variable_name); |
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symbol_c *get_type_id(symbol_c *variable_name); |
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/* NOTE: The following function should be moved to its own independent visitor class. |
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* In other words, it will be removed from this class in the future. |
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*/ |
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bool type_is_complex(symbol_c *variable_name); |
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/* a helper function... */ |
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void *visit_list(list_c *list); |
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/* a helper function... */ |
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void *base_type(symbol_c *symbol); |
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private: |
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/*************************/ |
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/* B.1 - Common elements */ |
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/*************************/ |
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/*******************************************/ |
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/* B 1.1 - Letters, digits and identifiers */ |
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/*******************************************/ |
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void *visit(identifier_c *variable_name); |
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/********************************/ |
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/* B 1.3.3 - Derived data types */ |
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/********************************/ |
|
138 |
/* identifier ':' array_spec_init */ |
|
139 |
void *visit(array_type_declaration_c *symbol); |
|
140 |
||
141 |
/* array_specification [ASSIGN array_initialization} */ |
|
142 |
/* array_initialization may be NULL ! */ |
|
143 |
void *visit(array_spec_init_c *symbol); |
|
144 |
||
145 |
/* ARRAY '[' array_subrange_list ']' OF non_generic_type_name */ |
|
146 |
void *visit(array_specification_c *symbol); |
|
147 |
||
148 |
/* structure_type_name ':' structure_specification */ |
|
149 |
void *visit(structure_type_declaration_c *symbol); |
|
150 |
||
151 |
/* structure_type_name ASSIGN structure_initialization */ |
|
152 |
/* structure_initialization may be NULL ! */ |
|
153 |
// SYM_REF2(initialized_structure_c, structure_type_name, structure_initialization) |
|
154 |
void *visit(initialized_structure_c *symbol); |
|
155 |
||
156 |
/* helper symbol for structure_declaration */ |
|
157 |
/* structure_declaration: STRUCT structure_element_declaration_list END_STRUCT */ |
|
158 |
/* structure_element_declaration_list structure_element_declaration ';' */ |
|
159 |
void *visit(structure_element_declaration_list_c *symbol); |
|
160 |
||
161 |
/* structure_element_name ':' spec_init */ |
|
162 |
void *visit(structure_element_declaration_c *symbol); |
|
163 |
||
164 |
/* helper symbol for structure_initialization */ |
|
165 |
/* structure_initialization: '(' structure_element_initialization_list ')' */ |
|
166 |
/* structure_element_initialization_list ',' structure_element_initialization */ |
|
167 |
void *visit(structure_element_initialization_list_c *symbol); /* should never get called... */ |
|
168 |
/* structure_element_name ASSIGN value */ |
|
169 |
void *visit(structure_element_initialization_c *symbol); /* should never get called... */ |
|
170 |
||
171 |
||
417
d48f53715f77
Re-write of stage3 code (done by Manuele and I), re-write of search_varfb_instance_type_c (done by myself), and several other bug fixes.
Mario de Sousa <msousa@fe.up.pt>
parents:
372
diff
changeset
|
172 |
/*********************/ |
d48f53715f77
Re-write of stage3 code (done by Manuele and I), re-write of search_varfb_instance_type_c (done by myself), and several other bug fixes.
Mario de Sousa <msousa@fe.up.pt>
parents:
372
diff
changeset
|
173 |
/* B 1.4 - Variables */ |
d48f53715f77
Re-write of stage3 code (done by Manuele and I), re-write of search_varfb_instance_type_c (done by myself), and several other bug fixes.
Mario de Sousa <msousa@fe.up.pt>
parents:
372
diff
changeset
|
174 |
/*********************/ |
d48f53715f77
Re-write of stage3 code (done by Manuele and I), re-write of search_varfb_instance_type_c (done by myself), and several other bug fixes.
Mario de Sousa <msousa@fe.up.pt>
parents:
372
diff
changeset
|
175 |
void *visit(symbolic_variable_c *symbol); |
d48f53715f77
Re-write of stage3 code (done by Manuele and I), re-write of search_varfb_instance_type_c (done by myself), and several other bug fixes.
Mario de Sousa <msousa@fe.up.pt>
parents:
372
diff
changeset
|
176 |
|
d48f53715f77
Re-write of stage3 code (done by Manuele and I), re-write of search_varfb_instance_type_c (done by myself), and several other bug fixes.
Mario de Sousa <msousa@fe.up.pt>
parents:
372
diff
changeset
|
177 |
/********************************************/ |
d48f53715f77
Re-write of stage3 code (done by Manuele and I), re-write of search_varfb_instance_type_c (done by myself), and several other bug fixes.
Mario de Sousa <msousa@fe.up.pt>
parents:
372
diff
changeset
|
178 |
/* B.1.4.1 Directly Represented Variables */ |
d48f53715f77
Re-write of stage3 code (done by Manuele and I), re-write of search_varfb_instance_type_c (done by myself), and several other bug fixes.
Mario de Sousa <msousa@fe.up.pt>
parents:
372
diff
changeset
|
179 |
/********************************************/ |
d48f53715f77
Re-write of stage3 code (done by Manuele and I), re-write of search_varfb_instance_type_c (done by myself), and several other bug fixes.
Mario de Sousa <msousa@fe.up.pt>
parents:
372
diff
changeset
|
180 |
/*************************************/ |
d48f53715f77
Re-write of stage3 code (done by Manuele and I), re-write of search_varfb_instance_type_c (done by myself), and several other bug fixes.
Mario de Sousa <msousa@fe.up.pt>
parents:
372
diff
changeset
|
181 |
/* B 1.4.2 - Multi-element variables */ |
d48f53715f77
Re-write of stage3 code (done by Manuele and I), re-write of search_varfb_instance_type_c (done by myself), and several other bug fixes.
Mario de Sousa <msousa@fe.up.pt>
parents:
372
diff
changeset
|
182 |
/*************************************/ |
d48f53715f77
Re-write of stage3 code (done by Manuele and I), re-write of search_varfb_instance_type_c (done by myself), and several other bug fixes.
Mario de Sousa <msousa@fe.up.pt>
parents:
372
diff
changeset
|
183 |
void *visit(array_variable_c *symbol); |
d48f53715f77
Re-write of stage3 code (done by Manuele and I), re-write of search_varfb_instance_type_c (done by myself), and several other bug fixes.
Mario de Sousa <msousa@fe.up.pt>
parents:
372
diff
changeset
|
184 |
void *visit(structured_variable_c *symbol); |
d48f53715f77
Re-write of stage3 code (done by Manuele and I), re-write of search_varfb_instance_type_c (done by myself), and several other bug fixes.
Mario de Sousa <msousa@fe.up.pt>
parents:
372
diff
changeset
|
185 |
|
181 | 186 |
/**************************************/ |
187 |
/* B.1.5 - Program organization units */ |
|
188 |
/**************************************/ |
|
189 |
/*****************************/ |
|
190 |
/* B 1.5.2 - Function Blocks */ |
|
191 |
/*****************************/ |
|
192 |
/* FUNCTION_BLOCK derived_function_block_name io_OR_other_var_declarations function_block_body END_FUNCTION_BLOCK */ |
|
193 |
// SYM_REF4(function_block_declaration_c, fblock_name, var_declarations, fblock_body, unused) |
|
194 |
void *visit(function_block_declaration_c *symbol); |
|
195 |
||
196 |
}; // search_varfb_instance_type_c |
|
197 |
||
198 |
||
199 |
||
200 |
||
201 |
||
202 |