2 * Mesa 3-D graphics library
4 * Copyright (C) 2010 LunarG Inc.
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
13 * The above copyright notice and this permission notice shall be included
14 * in all copies or substantial portions of the Software.
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 * DEALINGS IN THE SOFTWARE.
25 * Chia-I Wu <olv@lunarg.com>
31 #include "c11/threads.h"
33 #include "util/macros.h"
34 #include "u_current.h"
46 /* define public_string_pool and public_stubs */
47 #define MAPI_TMP_PUBLIC_STUBS
50 static struct mapi_stub dynamic_stubs
[MAPI_TABLE_NUM_DYNAMIC
];
51 static int num_dynamic_stubs
;
52 static int next_dynamic_slot
= MAPI_TABLE_NUM_STATIC
;
57 static once_flag flag
= ONCE_FLAG_INIT
;
58 call_once(&flag
, entry_patch_public
);
62 stub_compare(const void *key
, const void *elem
)
64 const char *name
= (const char *) key
;
65 const struct mapi_stub
*stub
= (const struct mapi_stub
*) elem
;
66 const char *stub_name
;
68 stub_name
= &public_string_pool
[(unsigned long) stub
->name
];
70 return strcmp(name
, stub_name
);
74 * Return the public stub with the given name.
76 const struct mapi_stub
*
77 stub_find_public(const char *name
)
79 return (const struct mapi_stub
*) bsearch(name
, public_stubs
,
80 ARRAY_SIZE(public_stubs
), sizeof(public_stubs
[0]), stub_compare
);
86 static struct mapi_stub
*
87 stub_add_dynamic(const char *name
)
89 struct mapi_stub
*stub
;
92 idx
= num_dynamic_stubs
;
93 /* minus 1 to make sure we can never reach the last slot */
94 if (idx
>= MAPI_TABLE_NUM_DYNAMIC
- 1)
97 stub
= &dynamic_stubs
[idx
];
99 /* dispatch to the last slot, which is reserved for no-op */
100 stub
->addr
= entry_generate(
101 MAPI_TABLE_NUM_STATIC
+ MAPI_TABLE_NUM_DYNAMIC
- 1);
105 stub
->name
= (const void *) strdup(name
);
106 /* to be fixed later */
109 num_dynamic_stubs
= idx
+ 1;
115 * Return the dynamic stub with the given name. If no such stub exists and
116 * generate is true, a new stub is generated.
119 stub_find_dynamic(const char *name
, int generate
)
121 static mtx_t dynamic_mutex
= _MTX_INITIALIZER_NP
;
122 struct mapi_stub
*stub
= NULL
;
125 mtx_lock(&dynamic_mutex
);
128 assert(!stub_find_public(name
));
130 count
= num_dynamic_stubs
;
131 for (i
= 0; i
< count
; i
++) {
132 if (strcmp(name
, (const char *) dynamic_stubs
[i
].name
) == 0) {
133 stub
= &dynamic_stubs
[i
];
138 /* generate a dynamic stub */
139 if (generate
&& !stub
)
140 stub
= stub_add_dynamic(name
);
142 mtx_unlock(&dynamic_mutex
);
147 static const struct mapi_stub
*
148 search_table_by_slot(const struct mapi_stub
*table
, size_t num_entries
,
152 for (i
= 0; i
< num_entries
; ++i
) {
153 if (table
[i
].slot
== slot
)
159 const struct mapi_stub
*
160 stub_find_by_slot(int slot
)
162 const struct mapi_stub
*stub
=
163 search_table_by_slot(public_stubs
, ARRAY_SIZE(public_stubs
), slot
);
166 return search_table_by_slot(dynamic_stubs
, num_dynamic_stubs
, slot
);
170 stub_fix_dynamic(struct mapi_stub
*stub
, const struct mapi_stub
*alias
)
180 slot
= next_dynamic_slot
++;
182 entry_patch(stub
->addr
, slot
);
187 * Return the name of a stub.
190 stub_get_name(const struct mapi_stub
*stub
)
194 if (stub
>= public_stubs
&&
195 stub
< public_stubs
+ ARRAY_SIZE(public_stubs
))
196 name
= &public_string_pool
[(unsigned long) stub
->name
];
198 name
= (const char *) stub
->name
;
204 * Return the slot of a stub.
207 stub_get_slot(const struct mapi_stub
*stub
)
213 * Return the address of a stub.
216 stub_get_addr(const struct mapi_stub
*stub
)
218 assert(stub
->addr
|| (unsigned int) stub
->slot
< MAPI_TABLE_NUM_STATIC
);
219 return (stub
->addr
) ? stub
->addr
: entry_get_public(stub
->slot
);