xref: /aosp_15_r20/external/mesa3d/src/mapi/shared-glapi/stub.c (revision 6104692788411f58d303aa86923a9ff6ecaded22)

/*
 * Mesa 3-D graphics library
 *
 * Copyright (C) 2010 LunarG Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 * Authors:
 *    Chia-I Wu <[email protected]>
 */

#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "c11/threads.h"

#include "util/macros.h"
#include "util/simple_mtx.h"
#include "u_current.h"
#include "entry.h"
#include "stub.h"
#include "table.h"


struct mapi_stub {
   size_t name_offset;
   int slot;
};

/* define public_string_pool and public_stubs */
#define MAPI_TMP_PUBLIC_STUBS
#include "mapi_tmp.h"

void
stub_init_once(void)
{
   static once_flag flag = ONCE_FLAG_INIT;
   call_once(&flag, entry_patch_public);
}

static int
stub_compare(const void *key, const void *elem)
{
   const char *name = (const char *) key;
   const struct mapi_stub *stub = (const struct mapi_stub *) elem;
   const char *stub_name;

   stub_name = &public_string_pool[stub->name_offset];

   return strcmp(name, stub_name);
}

/**
 * Return the public stub with the given name.
 */
const struct mapi_stub *
stub_find_public(const char *name)
{
   return (const struct mapi_stub *) bsearch(name, public_stubs,
         ARRAY_SIZE(public_stubs), sizeof(public_stubs[0]), stub_compare);
}


static const struct mapi_stub *
search_table_by_slot(const struct mapi_stub *table, size_t num_entries,
                     int slot)
{
   size_t i;
   for (i = 0; i < num_entries; ++i) {
      if (table[i].slot == slot)
         return &table[i];
   }
   return NULL;
}

const struct mapi_stub *
stub_find_by_slot(int slot)
{
   const struct mapi_stub *stub =
      search_table_by_slot(public_stubs, ARRAY_SIZE(public_stubs), slot);
   return stub;
}

/**
 * Return the name of a stub.
 */
const char *
stub_get_name(const struct mapi_stub *stub)
{
   return &public_string_pool[stub->name_offset];
}

/**
 * Return the slot of a stub.
 */
int
stub_get_slot(const struct mapi_stub *stub)
{
   return stub->slot;
}

/**
 * Return the address of a stub.
 */
mapi_func
stub_get_addr(const struct mapi_stub *stub)
{
   return entry_get_public(stub->slot);
}