PluginLoader.cpp revision 194710 
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/ManagedStatic.h"
16#include "llvm/Support/PluginLoader.h"
17#include "llvm/Support/Streams.h"
18#include "llvm/System/DynamicLibrary.h"
19#include "llvm/System/Mutex.h"
20#include <ostream>
21#include <vector>
22using namespace llvm;
23
24static ManagedStatic<std::vector<std::string> > Plugins;
25static ManagedStatic<sys::SmartMutex<true> > PluginsLock;
26
27void PluginLoader::operator=(const std::string &Filename) {
28  sys::SmartScopedLock<true> Lock(&*PluginsLock);
29  std::string Error;
30  if (sys::DynamicLibrary::LoadLibraryPermanently(Filename.c_str(), &Error)) {
31    cerr << "Error opening '" << Filename << "': " << Error
32         << "\n  -load request ignored.\n";
33  } else {
34    Plugins->push_back(Filename);
35  }
36}
37
38unsigned PluginLoader::getNumPlugins() {
39  sys::SmartScopedLock<true> Lock(&*PluginsLock);
40  return Plugins.isConstructed() ? Plugins->size() : 0;
41}
42
43std::string &PluginLoader::getPlugin(unsigned num) {
44  sys::SmartScopedLock<true> Lock(&*PluginsLock);
45  assert(Plugins.isConstructed() && num < Plugins->size() &&
46         "Asking for an out of bounds plugin");
47  return (*Plugins)[num];
48}
49