widget/gtk/DBusMenu.cpp

   1 /* -*- Mode: c++; tab-width: 2; indent-tabs-mode: nil; -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #include "DBusMenu.h"
   7 #include "prlink.h"
   8 #include "nsThreadUtils.h"
   9 #include "mozilla/ArrayUtils.h"
  10
  11 namespace mozilla::widget {
  12
  13 #define FUNC(name, type, params) \
  14   DBusMenuFunctions::_##name##_fn DBusMenuFunctions::s_##name;
  15 DBUSMENU_GLIB_FUNCTIONS
  16 DBUSMENU_GTK_FUNCTIONS
  17 #undef FUNC
  18
  19 static PRLibrary* gDbusmenuGlib = nullptr;
  20 static PRLibrary* gDbusmenuGtk = nullptr;
  21
  22 using DBusMenuFunc = void (*)();
  23 struct DBusMenuDynamicFunction {
  24   const char* functionName;
  25   DBusMenuFunc* function;
  26 };
  27
  28 static bool sInitialized;
  29 static bool sLibPresent;
  30
  31 /* static */ bool DBusMenuFunctions::Init() {
  32   MOZ_ASSERT(NS_IsMainThread());
  33   if (sInitialized) {
  34     return sLibPresent;
  35   }
  36   sInitialized = true;
  37 #define FUNC(name, type, params) \
  38   {#name, (DBusMenuFunc*)&DBusMenuFunctions::s_##name},
  39   static const DBusMenuDynamicFunction kDbusmenuGlibSymbols[] = {
  40       DBUSMENU_GLIB_FUNCTIONS};
  41   static const DBusMenuDynamicFunction kDbusmenuGtkSymbols[] = {
  42       DBUSMENU_GTK_FUNCTIONS};
  43
  44 #define LOAD_LIBRARY(symbol, name)                                            \
  45   if (!g##symbol) {                                                           \
  46     g##symbol = PR_LoadLibrary(name);                                         \
  47     if (!g##symbol) {                                                         \
  48       return false;                                                           \
  49     }                                                                         \
  50   }                                                                           \
  51   for (uint32_t i = 0; i < mozilla::ArrayLength(k##symbol##Symbols); ++i) {   \
  52     *k##symbol##Symbols[i].function =                                         \
  53         PR_FindFunctionSymbol(g##symbol, k##symbol##Symbols[i].functionName); \
  54     if (!*k##symbol##Symbols[i].function) {                                   \
  55       return false;                                                           \
  56     }                                                                         \
  57   }
  58
  59   LOAD_LIBRARY(DbusmenuGlib, "libdbusmenu-glib.so.4")
  60   LOAD_LIBRARY(DbusmenuGtk, "libdbusmenu-gtk3.so.4")
  61 #undef LOAD_LIBRARY
  62
  63   sLibPresent = true;
  64   return true;
  65 }
  66
  67 }  // namespace mozilla::widget