tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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GLLibraryLoader.cpp (1606B)

      1 /* This Source Code Form is subject to the terms of the Mozilla Public
      2 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
      3 * You can obtain one at http://mozilla.org/MPL/2.0/. */
      4 
      5 #include "GLLibraryLoader.h"
      6 
      7 #include <regex>
      8 
      9 #include "mozilla/gfx/Logging.h"
     10 #include "nsDebug.h"
     11 
     12 #ifdef WIN32
     13 #  include <windows.h>
     14 #endif
     15 
     16 namespace mozilla {
     17 namespace gl {
     18 
     19 void ClearSymbols(const SymLoadStruct* const firstStruct) {
     20  for (auto itr = firstStruct; itr->symPointer; ++itr) {
     21    *itr->symPointer = nullptr;
     22  }
     23 }
     24 
     25 bool SymbolLoader::LoadSymbols(const SymLoadStruct* const firstStruct,
     26                               const bool warnOnFailures) const {
     27  bool ok = true;
     28 
     29  for (auto itr = firstStruct; itr->symPointer; ++itr) {
     30    *itr->symPointer = nullptr;
     31 
     32    for (const auto& s : itr->symNames) {
     33      if (!s) break;
     34 
     35      const auto p = GetProcAddress(s);
     36      if (p) {
     37        *itr->symPointer = p;
     38        break;
     39      }
     40    }
     41 
     42    if (!*itr->symPointer) {
     43      if (warnOnFailures) {
     44        printf_stderr("Can't find symbol '%s'.\n", itr->symNames[0]);
     45      }
     46      ok = false;
     47    }
     48  }
     49 
     50  return ok;
     51 }
     52 
     53 // -
     54 
     55 PRFuncPtr SymbolLoader::GetProcAddress(const char* const name) const {
     56 #ifdef DEBUG
     57  static const std::regex kRESymbol("[a-z].*");
     58  if (!std::regex_match(name, kRESymbol)) {
     59    gfxCriticalError() << "Bad symbol name : " << name;
     60  }
     61 #endif
     62 
     63  PRFuncPtr ret = nullptr;
     64  if (!ret && mLib) {
     65    ret = PR_FindFunctionSymbol(mLib, name);
     66  }
     67  if (!ret && mPfn) {
     68    ret = mPfn(name);
     69  }
     70  return ret;
     71 }
     72 
     73 }  // namespace gl
     74 }  // namespace mozilla