LLVM API Documentation

PluginLoader.cpp

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00001 //===-- PluginLoader.cpp - Implement -load command line option ------------===//
00002 //
00003 //                     The LLVM Compiler Infrastructure
00004 //
00005 // This file was developed by the LLVM research group and is distributed under
00006 // the University of Illinois Open Source License. See LICENSE.TXT for details.
00007 //
00008 //===----------------------------------------------------------------------===//
00009 //
00010 // This file implements the -load <plugin> command line option handler.
00011 //
00012 //===----------------------------------------------------------------------===//
00013 
00014 #define DONT_GET_PLUGIN_LOADER_OPTION
00015 #include "llvm/Support/PluginLoader.h"
00016 #include "llvm/System/DynamicLibrary.h"
00017 #include <iostream>
00018 #include <vector>
00019 
00020 using namespace llvm;
00021 
00022 static std::vector<std::string>* plugins;
00023 
00024 void PluginLoader::operator=(const std::string &Filename) {
00025   std::string ErrorMessage;
00026 
00027   if (!plugins)
00028     plugins = new std::vector<std::string>();
00029 
00030   try {
00031     sys::DynamicLibrary::LoadLibraryPermanently(Filename.c_str());
00032     plugins->push_back(Filename);
00033   } catch (const std::string& errmsg) {
00034     if (errmsg.empty()) {
00035       ErrorMessage = "Unknown";
00036     } else {
00037       ErrorMessage = errmsg;
00038     }
00039   }
00040   if (!ErrorMessage.empty())
00041     std::cerr << "Error opening '" << Filename << "': " << ErrorMessage
00042               << "\n  -load request ignored.\n";
00043 }
00044 
00045 unsigned PluginLoader::getNumPlugins()
00046 {
00047   if(plugins)
00048     return plugins->size();
00049   else 
00050     return 0;
00051 }
00052 
00053 std::string& PluginLoader::getPlugin(unsigned num)
00054 {
00055   assert(plugins && num < plugins->size() && "Asking for an out of bounds plugin");
00056   return (*plugins)[num];
00057 }