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1.1 root 1: /* GNU Objective C Runtime selector related functions
2: Copyright (C) 1993 Free Software Foundation, Inc.
3:
4: Author: Kresten Krab Thorup
5:
6: This file is part of GNU CC.
7:
8: GNU CC is free software; you can redistribute it and/or modify it under the
9: terms of the GNU General Public License as published by the Free Software
10: Foundation; either version 2, or (at your option) any later version.
11:
12: GNU CC is distributed in the hope that it will be useful, but WITHOUT ANY
13: WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
14: FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
15: details.
16:
17: You should have received a copy of the GNU General Public License along with
18: GNU CC; see the file COPYING. If not, write to the Free Software
19: Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
20:
21: /* As a special exception, if you link this library with files compiled with
22: GCC to produce an executable, this does not cause the resulting executable
23: to be covered by the GNU General Public License. This exception does not
24: however invalidate any other reasons why the executable file might be
25: covered by the GNU General Public License. */
26:
27: #include "runtime.h"
28: #include "objc/sarray.h"
29:
30: /* Initial selector hash table size. Value doesnt matter much */
31: #define SELECTOR_HASH_SIZE 128
32:
33: /* Tables mapping selector names to uid and opposite */
34: static struct sarray* __objc_selector_array = 0; /* uid -> name */
35: static cache_ptr __objc_selector_hash = 0; /* name -> uid */
36:
37: static void register_selectors_from_list(MethodList_t);
38:
39: /* Number of selectors stored in each of the above tables */
40: int __objc_selector_max_index = 0;
41:
42: void __objc_init_selector_tables()
43: {
44: __objc_selector_array = sarray_new (SELECTOR_HASH_SIZE, 0);
45: __objc_selector_hash
46: = hash_new (SELECTOR_HASH_SIZE,
47: (hash_func_type) hash_string,
48: (compare_func_type) compare_strings);
49: }
50:
51: /* This routine is given a class and records all of the methods in its class
52: structure in the record table. */
53: void
54: __objc_register_selectors_from_class (Class* class)
55: {
56: MethodList_t method_list;
57:
58: method_list = class->methods;
59: while (method_list)
60: {
61: register_selectors_from_list (method_list);
62: method_list = method_list->method_next;
63: }
64: }
65:
66:
67: /* This routine is given a list of methods and records each of the methods in
68: the record table. This is the routine that does the actual recording
69: work.
70:
71: This one is only called for Class objects. For categories,
72: class_add_method_list is called.
73: */
74: static void
75: register_selectors_from_list (MethodList_t method_list)
76: {
77: int i = 0;
78: while (i < method_list->method_count)
79: {
80: Method_t method = &method_list->method_list[i];
81: method->method_name = sel_register_name ((char*)method->method_name);
82: i += 1;
83: }
84: }
85:
86: /* return selector representing name */
87: SEL
88: sel_get_uid (const char *name)
89: {
90: return (SEL) hash_value_for_key (__objc_selector_hash, name);
91: }
92:
93: /* Get name of selector. If selector is unknown, the empty string ""
94: is returned */
95: const char*
96: sel_get_name (SEL selector)
97: {
98: if ((soffset_decode((sidx)selector) > 0)
99: && (soffset_decode((sidx)selector) <= __objc_selector_max_index))
100: return sarray_get (__objc_selector_array, (sidx) selector);
101: else
102: return NULL;
103: }
104:
105: BOOL
106: sel_is_mapped (SEL selector)
107: {
108: unsigned int idx = soffset_decode ((sidx)selector);
109: return ((idx > 0) && (idx <= __objc_selector_max_index));
110: }
111:
112: /* The uninstalled dispatch table */
113: extern struct sarray* __objc_uninstalled_dtable;
114:
115: /* Store the passed selector name in the selector record and return its
116: selector value (value returned by sel_get_uid). */
117: SEL
118: sel_register_name (const char *sel)
119: {
120: SEL j;
121: sidx i;
122:
123: if ((j = sel_get_uid ((const char *) sel)))
124: return j;
125:
126: /* Save the selector name. */
127: __objc_selector_max_index += 1;
128: i = soffset_encode(__objc_selector_max_index);
129:
130: DEBUG_PRINTF ("Record selector %s as: %#x\n", sel, i);
131:
132: sarray_at_put_safe (__objc_selector_array, i, (void *) sel);
133: hash_add (&__objc_selector_hash, (void *) sel, (void *) i);
134:
135: sarray_realloc(__objc_uninstalled_dtable, __objc_selector_max_index+1);
136:
137: return (SEL) i;
138: }
139:
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