lib/Support/PluginLoader.cpp

   1 //===-- PluginLoader.cpp - Implement -load command line option ------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file implements the -load <plugin> command line option handler.
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #define DONT_GET_PLUGIN_LOADER_OPTION
  14 #include "llvm/Support/PluginLoader.h"
  15 #include "llvm/Support/DynamicLibrary.h"
  16 #include "llvm/Support/ManagedStatic.h"
  17 #include "llvm/Support/Mutex.h"
  18 #include "llvm/Support/raw_ostream.h"
  19 #include <vector>
  20 using namespace llvm;
  21
  22 static ManagedStatic<std::vector<std::string> > Plugins;
  23 static ManagedStatic<sys::SmartMutex<true> > PluginsLock;
  24
  25 void PluginLoader::operator=(const std::string &Filename) {
  26   sys::SmartScopedLock<true> Lock(*PluginsLock);
  27   std::string Error;
  28   if (sys::DynamicLibrary::LoadLibraryPermanently(Filename.c_str(), &Error)) {
  29     errs() << "Error opening '" << Filename << "': " << Error
  30            << "\n  -load request ignored.\n";
  31   } else {
  32     Plugins->push_back(Filename);
  33   }
  34 }
  35
  36 unsigned PluginLoader::getNumPlugins() {
  37   sys::SmartScopedLock<true> Lock(*PluginsLock);
  38   return Plugins.isConstructed() ? Plugins->size() : 0;
  39 }
  40
  41 std::string &PluginLoader::getPlugin(unsigned num) {
  42   sys::SmartScopedLock<true> Lock(*PluginsLock);
  43   assert(Plugins.isConstructed() && num < Plugins->size() &&
  44          "Asking for an out of bounds plugin");
  45   return (*Plugins)[num];
  46 }