1 /* |
|
2 * (c) 2003 Mario de Sousa |
|
3 * |
|
4 * Offered to the public under the terms of the GNU General Public License |
|
5 * as published by the Free Software Foundation; either version 2 of the |
|
6 * License, or (at your option) any later version. |
|
7 * |
|
8 * This program is distributed in the hope that it will be useful, but |
|
9 * WITHOUT ANY WARRANTY; without even the implied warranty of |
|
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
|
11 * Public License for more details. |
|
12 * |
|
13 * This code is made available on the understanding that it will not be |
|
14 * used in safety-critical situations without a full and competent review. |
|
15 */ |
|
16 |
|
17 /* |
|
18 * An IEC 61131-3 IL and ST compiler. |
|
19 * |
|
20 * Based on the |
|
21 * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10) |
|
22 * |
|
23 */ |
|
24 |
|
25 |
|
26 /* Determine the data type on which another data type is based on. |
|
27 * If a new default initial value is given, we DO NOT consider it a |
|
28 * new base class, and continue looking further! |
|
29 * |
|
30 * E.g. TYPE new_int_t : INT; END_TYPE; |
|
31 * TYPE new_int2_t : INT = 2; END_TYPE; |
|
32 * TYPE new_subr_t : INT (4..5); END_TYPE; |
|
33 * |
|
34 * new_int_t is really an INT!! |
|
35 * new_int2_t is also really an INT!! |
|
36 * new_subr_t is also really an INT!! |
|
37 */ |
|
38 class search_base_type_c: public null_visitor_c { |
|
39 private: |
|
40 symbol_c *current_type_name; |
|
41 bool is_subrange; |
|
42 bool is_enumerated; |
|
43 |
|
44 public: |
|
45 search_base_type_c(void) {current_type_name = NULL;} |
|
46 |
|
47 public: |
|
48 void *visit(identifier_c *type_name) { |
|
49 this->current_type_name = type_name; |
|
50 /* look up the type declaration... */ |
|
51 symbol_c *type_decl = type_symtable.find_value(type_name); |
|
52 if (type_decl == type_symtable.end_value()) |
|
53 /* Type declaration not found!! */ |
|
54 ERROR; |
|
55 |
|
56 return type_decl->accept(*this); |
|
57 } |
|
58 |
|
59 bool type_is_subrange(symbol_c* type_decl) { |
|
60 this->is_subrange = false; |
|
61 type_decl->accept(*this); |
|
62 return this->is_subrange; |
|
63 } |
|
64 |
|
65 bool type_is_enumerated(symbol_c* type_decl) { |
|
66 this->is_enumerated = false; |
|
67 type_decl->accept(*this); |
|
68 return this->is_enumerated; |
|
69 } |
|
70 |
|
71 /***********************************/ |
|
72 /* B 1.3.1 - Elementary Data Types */ |
|
73 /***********************************/ |
|
74 void *visit(time_type_name_c *symbol) {return (void *)symbol;} |
|
75 void *visit(bool_type_name_c *symbol) {return (void *)symbol;} |
|
76 void *visit(sint_type_name_c *symbol) {return (void *)symbol;} |
|
77 void *visit(int_type_name_c *symbol) {return (void *)symbol;} |
|
78 void *visit(dint_type_name_c *symbol) {return (void *)symbol;} |
|
79 void *visit(lint_type_name_c *symbol) {return (void *)symbol;} |
|
80 void *visit(usint_type_name_c *symbol) {return (void *)symbol;} |
|
81 void *visit(uint_type_name_c *symbol) {return (void *)symbol;} |
|
82 void *visit(udint_type_name_c *symbol) {return (void *)symbol;} |
|
83 void *visit(ulint_type_name_c *symbol) {return (void *)symbol;} |
|
84 void *visit(real_type_name_c *symbol) {return (void *)symbol;} |
|
85 void *visit(lreal_type_name_c *symbol) {return (void *)symbol;} |
|
86 void *visit(date_type_name_c *symbol) {return (void *)symbol;} |
|
87 void *visit(tod_type_name_c *symbol) {return (void *)symbol;} |
|
88 void *visit(dt_type_name_c *symbol) {return (void *)symbol;} |
|
89 void *visit(byte_type_name_c *symbol) {return (void *)symbol;} |
|
90 void *visit(word_type_name_c *symbol) {return (void *)symbol;} |
|
91 void *visit(dword_type_name_c *symbol) {return (void *)symbol;} |
|
92 void *visit(lword_type_name_c *symbol) {return (void *)symbol;} |
|
93 void *visit(string_type_name_c *symbol) {return (void *)symbol;} |
|
94 void *visit(wstring_type_name_c *symbol) {return (void *)symbol;} |
|
95 void *visit(constant_int_type_name_c *symbol) {return (void *)symbol;} |
|
96 void *visit(constant_real_type_name_c *symbol) {return (void *)symbol;} |
|
97 void *visit(direct_variable_type_name_c *symbol) {return (void *)symbol;} |
|
98 /******************************************************/ |
|
99 /* Extensions to the base standard as defined in */ |
|
100 /* "Safety Software Technical Specification, */ |
|
101 /* Part 1: Concepts and Function Blocks, */ |
|
102 /* Version 1.0 – Official Release" */ |
|
103 /* by PLCopen - Technical Committee 5 - 2006-01-31 */ |
|
104 /******************************************************/ |
|
105 void *visit(safebool_type_name_c *symbol) {return (void *)symbol;} |
|
106 |
|
107 /********************************/ |
|
108 /* B 1.3.3 - Derived data types */ |
|
109 /********************************/ |
|
110 /* simple_type_name ':' simple_spec_init */ |
|
111 void *visit(simple_type_declaration_c *symbol) { |
|
112 return symbol->simple_spec_init->accept(*this); |
|
113 } |
|
114 /* simple_specification ASSIGN constant */ |
|
115 void *visit(simple_spec_init_c *symbol) { |
|
116 return symbol->simple_specification->accept(*this); |
|
117 } |
|
118 |
|
119 /* subrange_type_name ':' subrange_spec_init */ |
|
120 void *visit(subrange_type_declaration_c *symbol) { |
|
121 return symbol->subrange_spec_init->accept(*this); |
|
122 } |
|
123 |
|
124 /* subrange_specification ASSIGN signed_integer */ |
|
125 void *visit(subrange_spec_init_c *symbol) { |
|
126 this->is_subrange = true; |
|
127 return symbol->subrange_specification->accept(*this); |
|
128 } |
|
129 |
|
130 /* integer_type_name '(' subrange')' */ |
|
131 void *visit(subrange_specification_c *symbol) { |
|
132 return symbol->integer_type_name->accept(*this); |
|
133 } |
|
134 |
|
135 /* signed_integer DOTDOT signed_integer */ |
|
136 void *visit(subrange_c *symbol) {ERROR; return NULL;} /* should never get called... */ |
|
137 |
|
138 /* enumerated_type_name ':' enumerated_spec_init */ |
|
139 void *visit(enumerated_type_declaration_c *symbol) { |
|
140 this->current_type_name = symbol->enumerated_type_name; |
|
141 return symbol->enumerated_spec_init->accept(*this); |
|
142 } |
|
143 |
|
144 /* enumerated_specification ASSIGN enumerated_value */ |
|
145 void *visit(enumerated_spec_init_c *symbol) { |
|
146 this->is_enumerated = true; |
|
147 return symbol->enumerated_specification->accept(*this); |
|
148 } |
|
149 |
|
150 /* helper symbol for enumerated_specification->enumerated_spec_init */ |
|
151 /* enumerated_value_list ',' enumerated_value */ |
|
152 void *visit(enumerated_value_list_c *symbol) { |
|
153 if (NULL == this->current_type_name) ERROR; |
|
154 return (void *)this->current_type_name; |
|
155 } |
|
156 |
|
157 /* enumerated_type_name '#' identifier */ |
|
158 // SYM_REF2(enumerated_value_c, type, value) |
|
159 void *visit(enumerated_value_c *symbol) {ERROR; return NULL;} /* should never get called... */ |
|
160 |
|
161 /* identifier ':' array_spec_init */ |
|
162 void *visit(array_type_declaration_c *symbol) { |
|
163 this->current_type_name = symbol->identifier; |
|
164 return symbol->array_spec_init->accept(*this); |
|
165 } |
|
166 |
|
167 /* array_specification [ASSIGN array_initialization} */ |
|
168 /* array_initialization may be NULL ! */ |
|
169 void *visit(array_spec_init_c *symbol) { |
|
170 return symbol->array_specification->accept(*this); |
|
171 } |
|
172 |
|
173 /* ARRAY '[' array_subrange_list ']' OF non_generic_type_name */ |
|
174 void *visit(array_specification_c *symbol) { |
|
175 if (NULL == this->current_type_name) ERROR; |
|
176 return symbol->non_generic_type_name->accept(*this); |
|
177 } |
|
178 |
|
179 /* helper symbol for array_specification */ |
|
180 /* array_subrange_list ',' subrange */ |
|
181 void *visit(array_subrange_list_c *symbol) {ERROR; return NULL;} /* should never get called... */ |
|
182 |
|
183 /* array_initialization: '[' array_initial_elements_list ']' */ |
|
184 /* helper symbol for array_initialization */ |
|
185 /* array_initial_elements_list ',' array_initial_elements */ |
|
186 void *visit(array_initial_elements_list_c *symbol) {ERROR; return NULL;} /* should never get called... */ |
|
187 |
|
188 /* integer '(' [array_initial_element] ')' */ |
|
189 /* array_initial_element may be NULL ! */ |
|
190 void *visit(array_initial_elements_c *symbol) {ERROR; return NULL;} /* should never get called... */ |
|
191 |
|
192 /* structure_type_name ':' structure_specification */ |
|
193 /* NOTE: structure_specification will point to either a |
|
194 * initialized_structure_c |
|
195 * OR A |
|
196 * structure_element_declaration_list_c |
|
197 */ |
|
198 void *visit(structure_type_declaration_c *symbol) { |
|
199 this->current_type_name = symbol->structure_type_name; |
|
200 return symbol->structure_specification->accept(*this); |
|
201 } |
|
202 |
|
203 /* structure_type_name ASSIGN structure_initialization */ |
|
204 /* structure_initialization may be NULL ! */ |
|
205 void *visit(initialized_structure_c *symbol) { |
|
206 return symbol->structure_type_name->accept(*this); |
|
207 } |
|
208 |
|
209 /* helper symbol for structure_declaration */ |
|
210 /* structure_declaration: STRUCT structure_element_declaration_list END_STRUCT */ |
|
211 /* structure_element_declaration_list structure_element_declaration ';' */ |
|
212 void *visit(structure_element_declaration_list_c *symbol) { |
|
213 if (NULL == this->current_type_name) ERROR; |
|
214 return (void *)symbol; |
|
215 } |
|
216 |
|
217 /* structure_element_name ':' *_spec_init */ |
|
218 void *visit(structure_element_declaration_c *symbol) {ERROR; return NULL;} /* should never get called... */ |
|
219 |
|
220 /* helper symbol for structure_initialization */ |
|
221 /* structure_initialization: '(' structure_element_initialization_list ')' */ |
|
222 /* structure_element_initialization_list ',' structure_element_initialization */ |
|
223 void *visit(structure_element_initialization_list_c *symbol) {ERROR; return NULL;} /* should never get called... */ |
|
224 |
|
225 /* structure_element_name ASSIGN value */ |
|
226 void *visit(structure_element_initialization_c *symbol) {ERROR; return NULL;} /* should never get called... */ |
|
227 |
|
228 /* string_type_name ':' elementary_string_type_name string_type_declaration_size string_type_declaration_init */ |
|
229 /* |
|
230 SYM_REF4(string_type_declaration_c, string_type_name, |
|
231 elementary_string_type_name, |
|
232 string_type_declaration_size, |
|
233 string_type_declaration_init) // may be == NULL! |
|
234 */ |
|
235 void *visit(string_type_declaration_c *symbol) {return symbol;} |
|
236 |
|
237 |
|
238 }; |
|
239 |
|
240 |
|
241 |
|
242 |
|