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1 | /* Lists of symbols for Bison | |
2 | ||
3 | Copyright (C) 2002 Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of Bison, the GNU Compiler Compiler. | |
6 | ||
7 | Bison is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 2, or (at your option) | |
10 | any later version. | |
11 | ||
12 | Bison is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with Bison; see the file COPYING. If not, write to | |
19 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
20 | Boston, MA 02111-1307, USA. */ | |
21 | ||
22 | #include "system.h" | |
23 | ||
24 | #include "complain.h" | |
25 | #include "symlist.h" | |
26 | ||
27 | ||
28 | /*--------------------------------------. | |
29 | | Create a list containing SYM at LOC. | | |
30 | `--------------------------------------*/ | |
31 | ||
32 | symbol_list * | |
33 | symbol_list_new (symbol *sym, location loc) | |
34 | { | |
35 | symbol_list *res = MALLOC (res, 1); | |
36 | res->next = NULL; | |
37 | res->sym = sym; | |
38 | res->location = loc; | |
39 | res->action = NULL; | |
40 | res->ruleprec = NULL; | |
41 | res->dprec = 0; | |
42 | res->merger = 0; | |
43 | return res; | |
44 | } | |
45 | ||
46 | ||
47 | /*---------------------------------. | |
48 | | Prepend SYM at LOC to the LIST. | | |
49 | `---------------------------------*/ | |
50 | ||
51 | symbol_list * | |
52 | symbol_list_prepend (symbol_list *list, symbol *sym, location loc) | |
53 | { | |
54 | symbol_list *res = symbol_list_new (sym, loc); | |
55 | res->next = list; | |
56 | return res; | |
57 | } | |
58 | ||
59 | ||
60 | /*-------------------------------------------------. | |
61 | | Free the LIST, but not the symbols it contains. | | |
62 | `-------------------------------------------------*/ | |
63 | ||
64 | void | |
65 | symbol_list_free (symbol_list *list) | |
66 | { | |
67 | LIST_FREE (symbol_list, list); | |
68 | } | |
69 | ||
70 | ||
71 | /*--------------------. | |
72 | | Return its length. | | |
73 | `--------------------*/ | |
74 | ||
75 | unsigned int | |
76 | symbol_list_length (symbol_list *list) | |
77 | { | |
78 | int res = 0; | |
79 | for (/* Nothing. */; list; list = list->next) | |
80 | ++res; | |
81 | return res; | |
82 | } | |
83 | ||
84 | ||
85 | /*--------------------------------------------------------------. | |
86 | | Get the data type (alternative in the union) of the value for | | |
87 | | symbol N in symbol list RP. | | |
88 | `--------------------------------------------------------------*/ | |
89 | ||
90 | uniqstr | |
91 | symbol_list_n_type_name_get (symbol_list *rp, location loc, int n) | |
92 | { | |
93 | int i; | |
94 | ||
95 | if (n < 0) | |
96 | { | |
97 | complain_at (loc, _("invalid $ value")); | |
98 | return NULL; | |
99 | } | |
100 | ||
101 | i = 0; | |
102 | ||
103 | while (i < n) | |
104 | { | |
105 | rp = rp->next; | |
106 | if (rp == NULL || rp->sym == NULL) | |
107 | { | |
108 | complain_at (loc, _("invalid $ value")); | |
109 | return NULL; | |
110 | } | |
111 | ++i; | |
112 | } | |
113 | ||
114 | return rp->sym->type_name; | |
115 | } |