PluginLoader.cpp revision 56d86168720849e94cb39809a29e7c391300460d 
1//===-- PluginLoader.cpp - Implement -load command line option ------------===//
2//
3// This file implements the -load <plugin> command line option processor.  When
4// linked into a program, this new command line option is available that allows
5// users to load shared objects into the running program.
6//
7// Note that there are no symbols exported by the .o file generated for this
8// .cpp file.  Because of this, a program must link against support.o instead of
9// support.a: otherwise this translation unit will not be included.
10//
11//===----------------------------------------------------------------------===//
12
13#include "Support/DynamicLinker.h"
14#include "Support/CommandLine.h"
15#include "Config/dlfcn.h"
16#include "Config/link.h"
17#include <iostream>
18
19namespace {
20  struct PluginLoader {
21    void operator=(const std::string &Filename) {
22      std::string ErrorMessage;
23      if (LinkDynamicObject (Filename.c_str (), &ErrorMessage))
24        std::cerr << "Error opening '" << Filename << "': " << ErrorMessage
25                  << "\n  -load request ignored.\n";
26    }
27  };
28}
29
30// This causes operator= above to be invoked for every -load option.
31static cl::opt<PluginLoader, false, cl::parser<std::string> >
32LoadOpt("load", cl::ZeroOrMore, cl::value_desc("plugin.so"),
33        cl::desc("Load the specified plugin"));
34