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      1 //===-- PluginLoader.cpp - Implement -load command line option ------------===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is distributed under the University of Illinois Open Source
      6 // License. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 //
     10 // This file implements the -load <plugin> command line option handler.
     11 //
     12 //===----------------------------------------------------------------------===//
     13 
     14 #define DONT_GET_PLUGIN_LOADER_OPTION
     15 #include "llvm/Support/PluginLoader.h"
     16 #include "llvm/Support/DynamicLibrary.h"
     17 #include "llvm/Support/ManagedStatic.h"
     18 #include "llvm/Support/Mutex.h"
     19 #include "llvm/Support/raw_ostream.h"
     20 #include <vector>
     21 using namespace llvm;
     22 
     23 static ManagedStatic<std::vector<std::string> > Plugins;
     24 static ManagedStatic<sys::SmartMutex<true> > PluginsLock;
     25 
     26 void PluginLoader::operator=(const std::string &Filename) {
     27   sys::SmartScopedLock<true> Lock(*PluginsLock);
     28   std::string Error;
     29   if (sys::DynamicLibrary::LoadLibraryPermanently(Filename.c_str(), &Error)) {
     30     errs() << "Error opening '" << Filename << "': " << Error
     31            << "\n  -load request ignored.\n";
     32   } else {
     33     Plugins->push_back(Filename);
     34   }
     35 }
     36 
     37 unsigned PluginLoader::getNumPlugins() {
     38   sys::SmartScopedLock<true> Lock(*PluginsLock);
     39   return Plugins.isConstructed() ? Plugins->size() : 0;
     40 }
     41 
     42 std::string &PluginLoader::getPlugin(unsigned num) {
     43   sys::SmartScopedLock<true> Lock(*PluginsLock);
     44   assert(Plugins.isConstructed() && num < Plugins->size() &&
     45          "Asking for an out of bounds plugin");
     46   return (*Plugins)[num];
     47 }
     48