author | etisserant |
Thu, 10 May 2007 17:39:50 +0200 | |
changeset 23 | d5b55ac4efe6 |
parent 0 | fb772792efd1 |
child 25 | e6a841e365b7 |
permissions | -rwxr-xr-x |
0
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1 |
/* |
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* (c) 2003 Mario de Sousa |
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3 |
* |
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4 |
* 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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/* 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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* A reference to the relevant base type __definition__ is returned. |
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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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* this class wil return INT, and __not__ MY_INT !! |
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* |
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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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class search_varfb_instance_type_c: public search_base_type_c { |
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private: |
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search_var_instance_decl_c search_var_instance_decl; |
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decompose_var_instance_name_c *decompose_var_instance_name; |
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symbol_c *current_structelement_name; |
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|
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public: |
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search_varfb_instance_type_c(symbol_c *search_scope): search_var_instance_decl(search_scope) { |
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this->decompose_var_instance_name = NULL; |
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this->current_structelement_name = NULL; |
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} |
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symbol_c *get_type(symbol_c *variable_name) { |
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this->current_structelement_name = NULL; |
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this->decompose_var_instance_name = new decompose_var_instance_name_c(variable_name); |
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if (NULL == decompose_var_instance_name) ERROR; |
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|
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/* find the part of the variable name that will appear in the |
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* variable declaration, for e.g., in window.point.x, this would be |
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* window! |
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*/ |
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symbol_c *var_name_part = decompose_var_instance_name->next_part(); |
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if (NULL == var_name_part) ERROR; |
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|
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/* Now we try to find the variable instance declaration, to determine its type... */ |
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symbol_c *var_decl = search_var_instance_decl.get_decl(var_name_part); |
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if (NULL == var_decl) { |
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/* variable instance declaration not found! */ |
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return NULL; |
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} |
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|
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/* if it is a struct or function block, we must search the type |
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* of the struct or function block member. |
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* This is done by this class visiting the var_decl. |
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* This class, while visiting, will recursively call |
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* decompose_var_instance_name->get_next() when and if required... |
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*/ |
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symbol_c *res = (symbol_c *)var_decl->accept(*this); |
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if (NULL == res) ERROR; |
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|
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/* make sure that we have decomposed all strcuture elements of the variable name */ |
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symbol_c *var_name = decompose_var_instance_name->next_part(); |
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if (NULL != var_name) ERROR; |
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|
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return res; |
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} |
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|
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private: |
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/* a helper function... */ |
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void *visit_list(list_c *list) { |
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if (NULL == current_structelement_name) ERROR; |
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|
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for(int i = 0; i < list->n; i++) { |
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void *res = list->elements[i]->accept(*this); |
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if (res != NULL) |
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return res; |
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} |
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/* not found! */ |
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return NULL; |
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} |
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110 |
|
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/* a helper function... */ |
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void *base_type(symbol_c *symbol) { |
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search_base_type_c search_base_type; |
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return symbol->accept(search_base_type); |
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115 |
} |
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116 |
|
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|
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private: |
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/* We override the base class' visitor to identifier_c. |
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* This is so because the base class does not consider a function block |
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* to be a type, unlike this class that allows a variable instance |
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* of a function block type... |
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*/ |
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void *visit(identifier_c *type_name) { |
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/* look up the type declaration... */ |
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symbol_c *fb_decl = function_block_type_symtable.find_value(type_name); |
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if (fb_decl != function_block_type_symtable.end_value()) |
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/* Type declaration found!! */ |
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return fb_decl->accept(*this); |
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|
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/* No. It is not a function block, so we let |
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* the base class take care of it... |
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*/ |
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return search_base_type_c::visit(type_name); |
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} |
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136 |
|
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/********************************/ |
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/* B 1.3.3 - Derived data types */ |
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/********************************/ |
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/* structure_type_name ':' structure_specification */ |
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void *visit(structure_type_declaration_c *symbol) { |
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return symbol->structure_specification->accept(*this); |
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/* NOTE: structure_specification will point to either a |
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* initialized_structure_c |
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* OR A |
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* structure_element_declaration_list_c |
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*/ |
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} |
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149 |
|
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/* structure_type_name ASSIGN structure_initialization */ |
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/* structure_initialization may be NULL ! */ |
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// SYM_REF2(initialized_structure_c, structure_type_name, structure_initialization) |
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void *visit(initialized_structure_c *symbol) { |
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/* make sure that we have decomposed all strcuture elements of the variable name */ |
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symbol_c *var_name = decompose_var_instance_name->next_part(); |
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if (NULL == var_name) { |
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/* this is it... ! |
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* No need to look any further... |
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*/ |
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/* NOTE: we could simply do a |
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* return (void *)symbol; |
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* nevertheless, note that this search_varfb_instance_type_c |
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* class inherits from the search_base_type_c class, |
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* which means that it will usually return the base type, |
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* and not the derived type (*). If we are to be consistent, |
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* we should guarantee that we always return the base type. |
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* To do this we could use |
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* return (void *)symbol->accept(*this); |
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* since this class inherits from the search_base_type_c. |
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* However, in this case we don't want it to follow |
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* the structs as this search_varfb_instance_type_c does. |
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* We therefore have to create a new search_base_type_c |
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* instance to search through this type without going |
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* through the structs... |
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*/ |
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return base_type(symbol->structure_type_name); |
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} |
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178 |
|
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/* now search the structure declaration */ |
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current_structelement_name = var_name; |
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/* recursively find out the data type of var_name... */ |
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return symbol->structure_type_name->accept(*this); |
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} |
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184 |
|
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/* helper symbol for structure_declaration */ |
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186 |
/* structure_declaration: STRUCT structure_element_declaration_list END_STRUCT */ |
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/* structure_element_declaration_list structure_element_declaration ';' */ |
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void *visit(structure_element_declaration_list_c *symbol) {return visit_list(symbol);} |
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189 |
|
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/* structure_element_name ':' spec_init */ |
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void *visit(structure_element_declaration_c *symbol) { |
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if (NULL == current_structelement_name) ERROR; |
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193 |
|
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if (compare_identifiers(symbol->structure_element_name, current_structelement_name) == 0) |
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return symbol->spec_init->accept(*this); |
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196 |
|
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return NULL; |
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198 |
} |
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199 |
|
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/* helper symbol for structure_initialization */ |
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201 |
/* structure_initialization: '(' structure_element_initialization_list ')' */ |
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/* structure_element_initialization_list ',' structure_element_initialization */ |
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void *visit(structure_element_initialization_list_c *symbol) {ERROR; return NULL;} /* should never get called... */ |
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/* structure_element_name ASSIGN value */ |
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void *visit(structure_element_initialization_c *symbol) {ERROR; return NULL;} /* should never get called... */ |
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206 |
|
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207 |
|
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208 |
|
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209 |
/**************************************/ |
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210 |
/* B.1.5 - Program organization units */ |
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211 |
/**************************************/ |
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/*****************************/ |
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/* B 1.5.2 - Function Blocks */ |
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/*****************************/ |
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/* FUNCTION_BLOCK derived_function_block_name io_OR_other_var_declarations function_block_body END_FUNCTION_BLOCK */ |
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// SYM_REF4(function_block_declaration_c, fblock_name, var_declarations, fblock_body, unused) |
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void *visit(function_block_declaration_c *symbol) { |
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/* make sure that we have decomposed all strcuture elements of the variable name */ |
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219 |
|
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symbol_c *var_name = decompose_var_instance_name->next_part(); |
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if (NULL == var_name) { |
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222 |
/* this is it... ! |
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223 |
* No need to look any further... |
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* Note also that, unlike for the struct types, a function block may |
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* not be defined based on another (i.e. no inheritance is allowed), |
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* so this function block is already the most base type. |
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227 |
* We simply return it. |
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*/ |
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return (void *)symbol; |
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} |
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231 |
|
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/* now search the function block declaration for the variable... */ |
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search_var_instance_decl_c search_decl(symbol); |
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symbol_c *var_decl = search_decl.get_decl(var_name); |
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if (NULL == var_decl) { |
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/* variable instance declaration not found! */ |
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return NULL; |
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} |
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|
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/* We have found the declaration. |
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* Should we look any further? |
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*/ |
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var_name = decompose_var_instance_name->next_part(); |
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if (NULL == var_name) { |
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/* this is it... ! */ |
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return base_type(var_decl); |
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} |
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|
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current_structelement_name = var_name; |
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/* recursively find out the data type of var_name... */ |
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return symbol->var_declarations->accept(*this); |
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} |
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|
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}; |
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|
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|
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259 |