|
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 /* Returns the function block type declaration |
|
28 * of a specific function block instance. |
|
29 */ |
|
30 |
|
31 |
|
32 |
|
33 /* Returns the type name of a specific function block |
|
34 * instance. This class will search the variable |
|
35 * declarations inside the scope given to it |
|
36 * searching for the declaration of the function |
|
37 * block instance. |
|
38 * |
|
39 * The class constructor must be given the search scope |
|
40 * (function, function block or program within which |
|
41 * the function block instance was declared). |
|
42 * |
|
43 * This class will search the tree from the root given to the |
|
44 * constructor. Another option would be to build a symbol table, |
|
45 * and search that instead. Building the symbol table would be done |
|
46 * while visiting the variable declaration objects in the parse |
|
47 * tree. Unfortuantely, generate_c_c does not visit these |
|
48 * objects, delegating it to another class. This means that |
|
49 * we would need another specialised class just to build the |
|
50 * symbol table. We might just as well have a specialised class |
|
51 * that searches the tree itself for the relevant info. This |
|
52 * class is exactly that...! |
|
53 */ |
|
54 |
|
55 |
|
56 class search_fb_instance_decl_c: public search_visitor_c { |
|
57 |
|
58 private: |
|
59 symbol_c *search_scope; |
|
60 |
|
61 symbol_c *search_name; |
|
62 symbol_c *current_fb_type_name; |
|
63 |
|
64 public: |
|
65 search_fb_instance_decl_c(symbol_c *search_scope); |
|
66 symbol_c *get_type_name(symbol_c *fb_instance_name); |
|
67 |
|
68 public: |
|
69 /***************************/ |
|
70 /* B 0 - Programming Model */ |
|
71 /***************************/ |
|
72 void *visit(library_c *symbol); |
|
73 |
|
74 /******************************************/ |
|
75 /* B 1.4.3 - Declaration & Initialisation */ |
|
76 /******************************************/ |
|
77 |
|
78 /* name_list ':' function_block_type_name ASSIGN structure_initialization */ |
|
79 /* structure_initialization -> may be NULL ! */ |
|
80 void *visit(fb_name_decl_c *symbol); |
|
81 /* name_list ',' fb_name */ |
|
82 void *visit(fb_name_list_c *symbol); |
|
83 |
|
84 /**************************************/ |
|
85 /* B.1.5 - Program organization units */ |
|
86 /**************************************/ |
|
87 /***********************/ |
|
88 /* B 1.5.1 - Functions */ |
|
89 /***********************/ |
|
90 void *visit(function_declaration_c *symbol); |
|
91 |
|
92 /*****************************/ |
|
93 /* B 1.5.2 - Function Blocks */ |
|
94 /*****************************/ |
|
95 void *visit(function_block_declaration_c *symbol); |
|
96 |
|
97 /**********************/ |
|
98 /* B 1.5.3 - Programs */ |
|
99 /**********************/ |
|
100 void *visit(program_declaration_c *symbol); |
|
101 }; // search_fb_instance_decl_c |
|
102 |
|
103 |
|
104 |
|
105 |