|
181
|
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 |
/*
|
|
|
27 |
* Function parameter iterator.
|
|
|
28 |
* Iterate through the in/out parameters of a function declaration.
|
|
|
29 |
* Function blocks are also suported.
|
|
|
30 |
*
|
|
|
31 |
* This is part of the 4th stage that generates
|
|
|
32 |
* a c++ source program equivalent to the IL and ST
|
|
|
33 |
* code.
|
|
|
34 |
*/
|
|
|
35 |
|
|
|
36 |
/* Given a function_declaration_c, iterate through each
|
|
|
37 |
* function in/out/inout parameter, returning the name
|
|
|
38 |
* of each parameter...function_param_iterator_c
|
|
|
39 |
*/
|
|
|
40 |
|
|
|
41 |
|
|
|
42 |
#include "../absyntax/visitor.hh"
|
|
|
43 |
|
|
|
44 |
|
|
|
45 |
class function_param_iterator_c : public null_visitor_c {
|
|
|
46 |
public:
|
|
|
47 |
/* A type to specify the type of parameter.
|
|
|
48 |
* VAR_INPUT => direction_in
|
|
|
49 |
* VAR_OUTPUT => direction_out
|
|
|
50 |
* VAR_IN_OUT => direction_inout
|
|
|
51 |
* VAR_EXTERNAL => direction_extref
|
|
|
52 |
*
|
|
|
53 |
* Note that VAR_EXTERNAL declares variables that are in reality references
|
|
|
54 |
* to global variables. This is used only inside programs!
|
|
|
55 |
* These references to external variables must be correctly initialised to refer
|
|
|
56 |
* to the correct global variable. Note that the user may define which variable is to be
|
|
|
57 |
* referenced in a CONFIGURATION, and that different instantiations of a program
|
|
|
58 |
* may have the same external variable reference diffenrent global variables!
|
|
|
59 |
* The references must therefore be correctly initialised when the program instance
|
|
|
60 |
* is created. This may be done by the PROGRAM class constructor since the ST and IL
|
|
|
61 |
* languages do not allow the VAR_EXTERNAL reference to change at runtime
|
|
|
62 |
* for a specific instance.
|
|
|
63 |
*
|
|
|
64 |
* We therefore need to call a PROGRAM class constructor with the variables
|
|
|
65 |
* that should be refernced by the VAR_EXTERNAL variables. The direction_extref will
|
|
|
66 |
* be used to identify these parameters!
|
|
|
67 |
*/
|
|
|
68 |
typedef enum {direction_in, direction_out, direction_inout, direction_extref} param_direction_t ;
|
|
|
69 |
|
|
|
70 |
|
|
|
71 |
private:
|
|
|
72 |
/* a pointer to the function_block_declaration_c
|
|
|
73 |
* or function_declaration_c currently being analysed.
|
|
|
74 |
*/
|
|
|
75 |
symbol_c *f_decl;
|
|
|
76 |
int next_param, param_count;
|
|
|
77 |
identifier_c *current_param_name;
|
|
|
78 |
symbol_c *current_param_type;
|
|
|
79 |
symbol_c *current_param_default_value;
|
|
|
80 |
param_direction_t current_param_direction;
|
|
|
81 |
bool en_declared;
|
|
|
82 |
bool eno_declared;
|
|
|
83 |
|
|
|
84 |
private:
|
|
|
85 |
void* handle_param_list(list_c *list);
|
|
|
86 |
void* handle_single_param(symbol_c *var_name);
|
|
|
87 |
|
|
|
88 |
void* iterate_list(list_c *list);
|
|
|
89 |
|
|
|
90 |
public:
|
|
|
91 |
/* start off at the first parameter once again... */
|
|
|
92 |
void reset(void);
|
|
|
93 |
|
|
|
94 |
/* initialise the iterator object.
|
|
|
95 |
* We must be given a reference to the function declaration
|
|
|
96 |
* that will be analysed...
|
|
|
97 |
*/
|
|
|
98 |
function_param_iterator_c(function_declaration_c *f_decl);
|
|
|
99 |
|
|
|
100 |
/* initialise the iterator object.
|
|
|
101 |
* We must be given a reference to the function block declaration
|
|
|
102 |
* that will be analysed...
|
|
|
103 |
*/
|
|
|
104 |
function_param_iterator_c(function_block_declaration_c *fb_decl);
|
|
|
105 |
|
|
|
106 |
/* initialise the iterator object.
|
|
|
107 |
* We must be given a reference to the program declaration
|
|
|
108 |
* that will be analysed...
|
|
|
109 |
*/
|
|
|
110 |
function_param_iterator_c(program_declaration_c *p_decl);
|
|
|
111 |
|
|
|
112 |
/* Skip to the next parameter. After object creation,
|
|
|
113 |
* the object references on parameter _before_ the first, so
|
|
|
114 |
* this function must be called once to get the object to
|
|
|
115 |
* reference the first parameter...
|
|
|
116 |
*
|
|
|
117 |
* Returns the parameter's name!
|
|
|
118 |
*/
|
|
|
119 |
identifier_c *next(void);
|
|
|
120 |
|
|
|
121 |
identifier_c *declare_en_param(void);
|
|
|
122 |
|
|
|
123 |
identifier_c *declare_eno_param(void);
|
|
|
124 |
|
|
|
125 |
/* Returns the currently referenced parameter's default value,
|
|
|
126 |
* or NULL if none is specified in the function declrataion itself.
|
|
|
127 |
*/
|
|
|
128 |
symbol_c *default_value(void);
|
|
|
129 |
|
|
|
130 |
/* Returns the currently referenced parameter's type name. */
|
|
|
131 |
symbol_c *param_type(void);
|
|
|
132 |
|
|
|
133 |
/* Returns the currently referenced parameter's data passing direction.
|
|
|
134 |
* i.e. VAR_INPUT, VAR_OUTPUT or VAR_INOUT
|
|
|
135 |
*/
|
|
|
136 |
param_direction_t param_direction(void);
|
|
|
137 |
|
|
|
138 |
private:
|
|
|
139 |
/******************************************/
|
|
|
140 |
/* B 1.4.3 - Declaration & Initialisation */
|
|
|
141 |
/******************************************/
|
|
|
142 |
void *visit(input_declarations_c *symbol);
|
|
|
143 |
|
|
|
144 |
void *visit(input_declaration_list_c *symbol);
|
|
|
145 |
|
|
|
146 |
void *visit(edge_declaration_c *symbol);
|
|
|
147 |
void *visit(en_param_declaration_c *symbol);
|
|
|
148 |
/* var1_list ':' array_spec_init */
|
|
|
149 |
//SYM_REF2(array_var_init_decl_c, var1_list, array_spec_init)
|
|
|
150 |
void *visit(array_var_init_decl_c *symbol);
|
|
|
151 |
|
|
|
152 |
/* var1_list ':' initialized_structure */
|
|
|
153 |
//SYM_REF2(structured_var_init_decl_c, var1_list, initialized_structure)
|
|
|
154 |
void *visit(structured_var_init_decl_c *symbol);
|
|
|
155 |
|
|
|
156 |
#if 0
|
|
|
157 |
/* name_list ':' function_block_type_name ASSIGN structure_initialization */
|
|
|
158 |
/* structure_initialization -> may be NULL ! */
|
|
|
159 |
SYM_REF4(fb_name_decl_c, fb_name_list, function_block_type_name, structure_initialization, unused)
|
|
|
160 |
|
|
|
161 |
/* name_list ',' fb_name */
|
|
|
162 |
SYM_LIST(fb_name_list_c)
|
|
|
163 |
#endif
|
|
|
164 |
|
|
|
165 |
void *visit(output_declarations_c *symbol);
|
|
|
166 |
void *visit(eno_param_declaration_c *symbol);
|
|
|
167 |
void *visit(input_output_declarations_c *symbol);
|
|
|
168 |
void *visit(var_declaration_list_c *symbol);
|
|
|
169 |
|
|
|
170 |
|
|
|
171 |
/* var1_list ':' array_specification */
|
|
|
172 |
//SYM_REF2(array_var_declaration_c, var1_list, array_specification)
|
|
|
173 |
void *visit(array_var_declaration_c *symbol);
|
|
|
174 |
|
|
|
175 |
/* var1_list ':' structure_type_name */
|
|
|
176 |
//SYM_REF2(structured_var_declaration_c, var1_list, structure_type_name)
|
|
|
177 |
void *visit(structured_var_declaration_c *symbol);
|
|
|
178 |
|
|
|
179 |
/* VAR [CONSTANT] var_init_decl_list END_VAR */
|
|
|
180 |
void *visit(var_declarations_c *symbol);
|
|
|
181 |
|
|
|
182 |
#if 0
|
|
|
183 |
/* VAR RETAIN var_init_decl_list END_VAR */
|
|
|
184 |
SYM_REF2(retentive_var_declarations_c, var_init_decl_list, unused)
|
|
|
185 |
|
|
|
186 |
/* VAR [CONSTANT|RETAIN|NON_RETAIN] located_var_decl_list END_VAR */
|
|
|
187 |
/* option -> may be NULL ! */
|
|
|
188 |
SYM_REF2(located_var_declarations_c, option, located_var_decl_list)
|
|
|
189 |
|
|
|
190 |
/* helper symbol for located_var_declarations */
|
|
|
191 |
/* located_var_decl_list located_var_decl ';' */
|
|
|
192 |
SYM_LIST(located_var_decl_list_c)
|
|
|
193 |
|
|
|
194 |
/* [variable_name] location ':' located_var_spec_init */
|
|
|
195 |
/* variable_name -> may be NULL ! */
|
|
|
196 |
SYM_REF4(located_var_decl_c, variable_name, location, located_var_spec_init, unused)
|
|
|
197 |
#endif
|
|
|
198 |
|
|
|
199 |
/*| VAR_EXTERNAL [CONSTANT] external_declaration_list END_VAR */
|
|
|
200 |
/* option -> may be NULL ! */
|
|
|
201 |
// SYM_REF2(external_var_declarations_c, option, external_declaration_list)
|
|
|
202 |
void *visit(external_var_declarations_c *symbol);
|
|
|
203 |
|
|
|
204 |
/* helper symbol for external_var_declarations */
|
|
|
205 |
/*| external_declaration_list external_declaration';' */
|
|
|
206 |
// SYM_LIST(external_declaration_list_c)
|
|
|
207 |
void *visit(external_declaration_list_c *symbol);
|
|
|
208 |
|
|
|
209 |
/* global_var_name ':' (simple_specification|subrange_specification|enumerated_specification|array_specification|prev_declared_structure_type_name|function_block_type_name */
|
|
|
210 |
//SYM_REF2(external_declaration_c, global_var_name, specification)
|
|
|
211 |
void *visit(external_declaration_c *symbol);
|
|
|
212 |
|
|
|
213 |
|
|
|
214 |
#if 0
|
|
|
215 |
/*| VAR_GLOBAL [CONSTANT|RETAIN] global_var_decl_list END_VAR */
|
|
|
216 |
/* option -> may be NULL ! */
|
|
|
217 |
SYM_REF2(global_var_declarations_c, option, global_var_decl_list)
|
|
|
218 |
|
|
|
219 |
/* helper symbol for global_var_declarations */
|
|
|
220 |
/*| global_var_decl_list global_var_decl ';' */
|
|
|
221 |
SYM_LIST(global_var_decl_list_c)
|
|
|
222 |
|
|
|
223 |
/*| global_var_spec ':' [located_var_spec_init|function_block_type_name] */
|
|
|
224 |
/* type_specification ->may be NULL ! */
|
|
|
225 |
SYM_REF2(global_var_decl_c, global_var_spec, type_specification)
|
|
|
226 |
|
|
|
227 |
/*| global_var_name location */
|
|
|
228 |
SYM_REF2(global_var_spec_c, global_var_name, location)
|
|
|
229 |
|
|
|
230 |
/* AT direct_variable */
|
|
|
231 |
SYM_REF2(location_c, direct_variable, unused)
|
|
|
232 |
|
|
|
233 |
/*| global_var_list ',' global_var_name */
|
|
|
234 |
SYM_LIST(global_var_list_c)
|
|
|
235 |
|
|
|
236 |
/* var1_list ':' single_byte_string_spec */
|
|
|
237 |
SYM_REF2(single_byte_string_var_declaration_c, var1_list, single_byte_string_spec)
|
|
|
238 |
|
|
|
239 |
/* STRING ['[' integer ']'] [ASSIGN single_byte_character_string] */
|
|
|
240 |
/* integer ->may be NULL ! */
|
|
|
241 |
/* single_byte_character_string ->may be NULL ! */
|
|
|
242 |
SYM_REF2(single_byte_string_spec_c, integer, single_byte_character_string)
|
|
|
243 |
|
|
|
244 |
/* var1_list ':' double_byte_string_spec */
|
|
|
245 |
SYM_REF2(double_byte_string_var_declaration_c, var1_list, double_byte_string_spec)
|
|
|
246 |
|
|
|
247 |
/* WSTRING ['[' integer ']'] [ASSIGN double_byte_character_string] */
|
|
|
248 |
/* integer ->may be NULL ! */
|
|
|
249 |
/* double_byte_character_string ->may be NULL ! */
|
|
|
250 |
SYM_REF2(double_byte_string_spec_c, integer, double_byte_character_string)
|
|
|
251 |
|
|
|
252 |
/*| VAR [RETAIN|NON_RETAIN] incompl_located_var_decl_list END_VAR */
|
|
|
253 |
/* option ->may be NULL ! */
|
|
|
254 |
SYM_REF2(incompl_located_var_declarations_c, option, incompl_located_var_decl_list)
|
|
|
255 |
|
|
|
256 |
/* helper symbol for incompl_located_var_declarations */
|
|
|
257 |
/*| incompl_located_var_decl_list incompl_located_var_decl ';' */
|
|
|
258 |
SYM_LIST(incompl_located_var_decl_list_c)
|
|
|
259 |
|
|
|
260 |
/* variable_name incompl_location ':' var_spec */
|
|
|
261 |
SYM_REF4(incompl_located_var_decl_c, variable_name, incompl_location, var_spec, unused)
|
|
|
262 |
|
|
|
263 |
/* AT incompl_location_token */
|
|
|
264 |
SYM_TOKEN(incompl_location_c)
|
|
|
265 |
#endif
|
|
|
266 |
|
|
|
267 |
|
|
|
268 |
void *visit(var1_init_decl_c *symbol);
|
|
|
269 |
void *visit(var1_list_c *symbol);
|
|
|
270 |
void *visit(var_init_decl_list_c *symbol);
|
|
|
271 |
|
|
|
272 |
|
|
|
273 |
/***********************/
|
|
|
274 |
/* B 1.5.1 - Functions */
|
|
|
275 |
/***********************/
|
|
|
276 |
void *visit(function_declaration_c *symbol);
|
|
|
277 |
/* intermediate helper symbol for function_declaration */
|
|
|
278 |
void *visit(var_declarations_list_c *symbol);
|
|
|
279 |
void *visit(function_var_decls_c *symbol);
|
|
|
280 |
|
|
|
281 |
|
|
|
282 |
/*****************************/
|
|
|
283 |
/* B 1.5.2 - Function Blocks */
|
|
|
284 |
/*****************************/
|
|
|
285 |
/* FUNCTION_BLOCK derived_function_block_name io_OR_other_var_declarations function_block_body END_FUNCTION_BLOCK */
|
|
|
286 |
void *visit(function_block_declaration_c *symbol);
|
|
|
287 |
|
|
|
288 |
/* intermediate helper symbol for function_declaration */
|
|
|
289 |
/* { io_var_declarations | other_var_declarations } */
|
|
|
290 |
/*
|
|
|
291 |
* NOTE: we re-use the var_declarations_list_c
|
|
|
292 |
*/
|
|
|
293 |
|
|
|
294 |
/* VAR_TEMP temp_var_decl_list END_VAR */
|
|
|
295 |
void *visit(temp_var_decls_c *symbol);
|
|
|
296 |
void *visit(temp_var_decls_list_c *symbol);
|
|
|
297 |
|
|
|
298 |
/* VAR NON_RETAIN var_init_decl_list END_VAR */
|
|
|
299 |
void *visit(non_retentive_var_decls_c *symbol);
|
|
|
300 |
|
|
|
301 |
|
|
|
302 |
/**********************/
|
|
|
303 |
/* B 1.5.3 - Programs */
|
|
|
304 |
/**********************/
|
|
|
305 |
/* PROGRAM program_type_name program_var_declarations_list function_block_body END_PROGRAM */
|
|
|
306 |
// SYM_REF4(program_declaration_c, program_type_name, var_declarations, function_block_body, unused)
|
|
|
307 |
void *visit(program_declaration_c *symbol);
|
|
|
308 |
|
|
|
309 |
/* intermediate helper symbol for program_declaration_c */
|
|
|
310 |
/* { io_var_declarations | other_var_declarations } */
|
|
|
311 |
/*
|
|
|
312 |
* NOTE: we re-use the var_declarations_list_c
|
|
|
313 |
*/
|
|
|
314 |
|
|
|
315 |
}; // function_param_iterator_c
|
|
|
316 |
|
|
|
317 |
|
|
|
318 |
|
|
|
319 |
|
|
|
320 |
|
|
|
321 |
|
|
|
322 |
|