1 files changed, 74 insertions, 0 deletions
diff --git a/gfx/gl/GLLibraryLoader.cpp b/gfx/gl/GLLibraryLoader.cpp
new file mode 100644
index 0000000000..e73f312d29
--- /dev/null
+++ b/gfx/gl/GLLibraryLoader.cpp
@@ -0,0 +1,74 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "GLLibraryLoader.h"
+
+#include <regex>
+
+#include "mozilla/gfx/Logging.h"
+#include "nsDebug.h"
+
+#ifdef WIN32
+#  include <windows.h>
+#endif
+
+namespace mozilla {
+namespace gl {
+
+void ClearSymbols(const SymLoadStruct* const firstStruct) {
+  for (auto itr = firstStruct; itr->symPointer; ++itr) {
+    *itr->symPointer = nullptr;
+  }
+}
+
+bool SymbolLoader::LoadSymbols(const SymLoadStruct* const firstStruct,
+                               const bool warnOnFailures) const {
+  bool ok = true;
+
+  for (auto itr = firstStruct; itr->symPointer; ++itr) {
+    *itr->symPointer = nullptr;
+
+    for (const auto& s : itr->symNames) {
+      if (!s) break;
+
+      const auto p = GetProcAddress(s);
+      if (p) {
+        *itr->symPointer = p;
+        break;
+      }
+    }
+
+    if (!*itr->symPointer) {
+      if (warnOnFailures) {
+        printf_stderr("Can't find symbol '%s'.\n", itr->symNames[0]);
+      }
+      ok = false;
+    }
+  }
+
+  return ok;
+}
+
+// -
+
+PRFuncPtr SymbolLoader::GetProcAddress(const char* const name) const {
+#ifdef DEBUG
+  static const std::regex kRESymbol("[a-z].*");
+  if (!std::regex_match(name, kRESymbol)) {
+    gfxCriticalError() << "Bad symbol name : " << name;
+  }
+#endif
+
+  PRFuncPtr ret = nullptr;
+  if (!ret && mLib) {
+    ret = PR_FindFunctionSymbol(mLib, name);
+  }
+  if (!ret && mPfn) {
+    ret = mPfn(name);
+  }
+  return ret;
+}
+
+}  // namespace gl
+}  // namespace mozilla