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/CommandLine.h"
14 #include <dlfcn.h>
15 #include <link.h>
16 #include <iostream>
17 
18 namespace {
19   struct PluginLoader {
20     void operator=(const std::string &Filename) {
21       if (dlopen(Filename.c_str(), RTLD_NOW) == 0)
22         std::cerr << "Error opening '" << Filename << "': " << dlerror()
23                   << "\n  -load request ignored.\n";
24     }
25   };
26 }
27 
28 // This causes operator= above to be invoked for every -load option.
29 static cl::opt<PluginLoader, false, cl::parser<std::string> >
30 LoadOpt("load", cl::ZeroOrMore, cl::value_desc("plugin.so"),
31         cl::desc("Load the specified plugin"));
32