70
|
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 |
* Seperation of type specification and default value constructs
|
|
28 |
* (for e.g. simple_spec_init_c), into a type specificiation part,
|
|
29 |
* and a default value part.
|
|
30 |
*/
|
|
31 |
|
|
32 |
|
|
33 |
|
|
34 |
|
|
35 |
//#include <stdio.h> /* required for NULL */
|
|
36 |
//#include <string>
|
|
37 |
//#include <iostream>
|
|
38 |
|
|
39 |
//#include "../../util/symtable.hh"
|
|
40 |
|
|
41 |
|
|
42 |
|
|
43 |
|
|
44 |
|
|
45 |
|
|
46 |
|
|
47 |
class spec_init_sperator_c: public null_visitor_c {
|
|
48 |
private:
|
|
49 |
/* this is a singleton class... */
|
|
50 |
static spec_init_sperator_c *class_instance;
|
|
51 |
static spec_init_sperator_c *get_class_instance(void) {
|
|
52 |
if (NULL == class_instance)
|
|
53 |
class_instance = new spec_init_sperator_c();
|
|
54 |
|
|
55 |
if (NULL == class_instance)
|
|
56 |
ERROR;
|
|
57 |
|
|
58 |
return class_instance;
|
|
59 |
}
|
|
60 |
|
|
61 |
private:
|
|
62 |
typedef enum {search_spec, search_init} search_what_t;
|
|
63 |
static search_what_t search_what;
|
|
64 |
|
|
65 |
public:
|
|
66 |
/* the only two public functions... */
|
|
67 |
static symbol_c *get_spec(symbol_c *spec_init) {
|
|
68 |
search_what = search_spec;
|
|
69 |
return (symbol_c *)spec_init->accept(*get_class_instance());
|
|
70 |
}
|
|
71 |
|
|
72 |
static symbol_c *get_init(symbol_c *spec_init) {
|
|
73 |
search_what = search_init;
|
|
74 |
return (symbol_c *)spec_init->accept(*get_class_instance());
|
|
75 |
}
|
|
76 |
|
|
77 |
// private:
|
|
78 |
public: /* probably needs to be public so it may be visited... !! */
|
|
79 |
|
|
80 |
|
|
81 |
/*******************************************/
|
|
82 |
/* B 1.1 - Letters, digits and identifiers */
|
|
83 |
/*******************************************/
|
|
84 |
// SYM_TOKEN(identifier_c)
|
|
85 |
void *visit(identifier_c *symbol) {
|
|
86 |
TRACE("spec_init_sperator_c::identifier_c");
|
|
87 |
switch (search_what) {
|
|
88 |
/* if we ever get called sith a simple identifier_c, then it must be a previously declared type... */
|
|
89 |
case search_spec: return symbol;
|
|
90 |
case search_init: return NULL;
|
|
91 |
}
|
|
92 |
ERROR; /* should never occur */
|
|
93 |
return NULL;
|
|
94 |
}
|
|
95 |
|
|
96 |
|
|
97 |
/********************************/
|
|
98 |
/* B 1.3.3 - Derived data types */
|
|
99 |
/********************************/
|
|
100 |
|
|
101 |
/* simple_specification ASSIGN constant */
|
|
102 |
void *visit(simple_spec_init_c *symbol) {
|
|
103 |
TRACE("spec_init_sperator_c::simple_spec_init_c");
|
|
104 |
switch (search_what) {
|
|
105 |
case search_spec: return symbol->simple_specification;
|
|
106 |
case search_init: return symbol->constant;
|
|
107 |
}
|
|
108 |
ERROR; /* should never occur */
|
|
109 |
return NULL;
|
|
110 |
}
|
|
111 |
|
|
112 |
/* subrange_specification ASSIGN signed_integer */
|
|
113 |
void *visit(subrange_spec_init_c *symbol) {
|
|
114 |
TRACE("spec_init_sperator_c::subrange_spec_init_c");
|
|
115 |
switch (search_what) {
|
98
|
116 |
case search_spec: return symbol->subrange_specification->accept(*this);
|
70
|
117 |
case search_init: return symbol->signed_integer;
|
|
118 |
}
|
|
119 |
ERROR; /* should never occur */
|
|
120 |
return NULL;
|
|
121 |
}
|
|
122 |
|
98
|
123 |
/* integer_type_name '(' subrange')' */
|
|
124 |
void *visit(subrange_specification_c *symbol) {
|
|
125 |
TRACE("spec_init_sperator_c::subrange_specification_c");
|
|
126 |
switch (search_what) {
|
|
127 |
case search_spec: return symbol->integer_type_name;
|
|
128 |
case search_init: return NULL; /* should never occur */
|
|
129 |
}
|
|
130 |
ERROR; /* should never occur */
|
|
131 |
return NULL;
|
|
132 |
}
|
|
133 |
|
|
134 |
/* array_specification [ASSIGN array_initialization} */
|
|
135 |
/* array_initialization may be NULL ! */
|
|
136 |
void *visit(array_spec_init_c *symbol) {
|
|
137 |
TRACE("spec_init_sperator_c::array_spec_init_c");
|
|
138 |
switch (search_what) {
|
|
139 |
case search_spec: return symbol->array_specification;
|
|
140 |
case search_init: return symbol->array_initialization;
|
|
141 |
}
|
|
142 |
return NULL;
|
|
143 |
}
|
|
144 |
|
70
|
145 |
/* enumerated_specification ASSIGN enumerated_value */
|
|
146 |
void *visit(enumerated_spec_init_c *symbol) {
|
|
147 |
TRACE("spec_init_sperator_c::enumerated_spec_init_c");
|
|
148 |
switch (search_what) {
|
|
149 |
case search_spec: return symbol->enumerated_specification;
|
|
150 |
case search_init: return symbol->enumerated_value;
|
|
151 |
}
|
|
152 |
ERROR; /* should never occur */
|
|
153 |
return NULL;
|
|
154 |
}
|
|
155 |
|
|
156 |
/* structure_type_name ASSIGN structure_initialization */
|
|
157 |
/* structure_initialization may be NULL ! */
|
|
158 |
//SYM_REF2(initialized_structure_c, structure_type_name, structure_initialization)
|
|
159 |
void *visit(initialized_structure_c *symbol) {
|
|
160 |
TRACE("spec_init_sperator_c::initialized_structure_c");
|
|
161 |
switch (search_what) {
|
|
162 |
case search_spec: return symbol->structure_type_name;
|
|
163 |
case search_init: return symbol->structure_initialization;
|
|
164 |
}
|
|
165 |
ERROR; /* should never occur */
|
|
166 |
return NULL;
|
|
167 |
}
|
|
168 |
|
|
169 |
|
|
170 |
/******************************************/
|
|
171 |
/* B 1.4.3 - Declaration & Initialisation */
|
|
172 |
/******************************************/
|
|
173 |
|
|
174 |
/* fb_name_list ':' function_block_type_name ASSIGN structure_initialization */
|
|
175 |
/* structure_initialization -> may be NULL ! */
|
|
176 |
void *visit(fb_name_decl_c *symbol) {
|
|
177 |
TRACE("spec_init_sperator_c::fb_name_decl_c");
|
|
178 |
switch (search_what) {
|
|
179 |
case search_spec: return symbol->function_block_type_name;
|
|
180 |
case search_init: return symbol->structure_initialization;
|
|
181 |
}
|
|
182 |
ERROR; /* should never occur */
|
|
183 |
return NULL;
|
|
184 |
}
|
|
185 |
|
|
186 |
}; /* class spec_init_sperator_c */
|
|
187 |
|
|
188 |
|
|
189 |
|
|
190 |
spec_init_sperator_c *spec_init_sperator_c ::class_instance = NULL;
|
|
191 |
spec_init_sperator_c::search_what_t spec_init_sperator_c::search_what;
|