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/Mutex.h"
17 #include "llvm/Support/raw_ostream.h"
18 #include <vector>
19 using namespace llvm;
20 
21 namespace {
22 
23 struct Plugins {
24   sys::SmartMutex<true> Lock;
25   std::vector<std::string> List;
26 };
27 
28 Plugins &getPlugins() {
29   static Plugins P;
30   return P;
31 }
32 
33 } // anonymous namespace
34 
35 void PluginLoader::operator=(const std::string &Filename) {
36   auto &P = getPlugins();
37   sys::SmartScopedLock<true> Lock(P.Lock);
38   std::string Error;
39   if (sys::DynamicLibrary::LoadLibraryPermanently(Filename.c_str(), &Error)) {
40     errs() << "Error opening '" << Filename << "': " << Error
41            << "\n  -load request ignored.\n";
42   } else {
43     P.List.push_back(Filename);
44   }
45 }
46 
47 unsigned PluginLoader::getNumPlugins() {
48   auto &P = getPlugins();
49   sys::SmartScopedLock<true> Lock(P.Lock);
50   return P.List.size();
51 }
52 
53 std::string &PluginLoader::getPlugin(unsigned num) {
54   auto &P = getPlugins();
55   sys::SmartScopedLock<true> Lock(P.Lock);
56   assert(num < P.List.size() && "Asking for an out of bounds plugin");
57   return P.List[num];
58 }
59