lib/CompilerDriver/Plugin.cpp

   1 //===--- Plugin.cpp - The LLVM Compiler Driver ------------------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open
   6 // Source License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 //  Plugin support.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/CompilerDriver/Plugin.h"
  15 #include "llvm/Support/ManagedStatic.h"
  16 #include "llvm/System/Mutex.h"
  17 #include <algorithm>
  18 #include <vector>
  19
  20 namespace {
  21
  22   // Registry::Add<> does not do lifetime management (probably issues
  23   // with static constructor/destructor ordering), so we have to
  24   // implement it here.
  25   //
  26   // All this static registration/life-before-main model seems
  27   // unnecessary convoluted to me.
  28
  29   static bool pluginListInitialized = false;
  30   typedef std::vector<const llvmc::BasePlugin*> PluginList;
  31   static PluginList Plugins;
  32   static llvm::ManagedStatic<llvm::sys::SmartMutex<true> > PluginMutex;
  33
  34   struct ByPriority {
  35     bool operator()(const llvmc::BasePlugin* lhs,
  36                     const llvmc::BasePlugin* rhs) {
  37       return lhs->Priority() < rhs->Priority();
  38     }
  39   };
  40 }
  41
  42 namespace llvmc {
  43
  44   PluginLoader::PluginLoader() {
  45     llvm::sys::SmartScopedLock<true> Lock(*PluginMutex);
  46     if (!pluginListInitialized) {
  47       for (PluginRegistry::iterator B = PluginRegistry::begin(),
  48              E = PluginRegistry::end(); B != E; ++B)
  49         Plugins.push_back(B->instantiate());
  50       std::sort(Plugins.begin(), Plugins.end(), ByPriority());
  51     }
  52     pluginListInitialized = true;
  53   }
  54
  55   PluginLoader::~PluginLoader() {
  56     llvm::sys::SmartScopedLock<true> Lock(*PluginMutex);
  57     if (pluginListInitialized) {
  58       for (PluginList::iterator B = Plugins.begin(), E = Plugins.end();
  59            B != E; ++B)
  60         delete (*B);
  61     }
  62     pluginListInitialized = false;
  63   }
  64
  65   void PluginLoader::PopulateLanguageMap(LanguageMap& langMap) {
  66     llvm::sys::SmartScopedLock<true> Lock(*PluginMutex);
  67     for (PluginList::iterator B = Plugins.begin(), E = Plugins.end();
  68          B != E; ++B)
  69       (*B)->PopulateLanguageMap(langMap);
  70   }
  71
  72   void PluginLoader::PopulateCompilationGraph(CompilationGraph& graph) {
  73     llvm::sys::SmartScopedLock<true> Lock(*PluginMutex);
  74     for (PluginList::iterator B = Plugins.begin(), E = Plugins.end();
  75          B != E; ++B)
  76       (*B)->PopulateCompilationGraph(graph);
  77   }
  78
  79 }