1 //===-- PluginLoader.cpp - Implement -load command line option ------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements the -load <plugin> command line option processor.  When
11 // linked into a program, this new command line option is available that allows
12 // users to load shared objects into the running program.
13 //
14 // Note that there are no symbols exported by the .o file generated for this
15 // .cpp file.  Because of this, a program must link against support.o instead of
16 // support.a: otherwise this translation unit will not be included.
17 //
18 //===----------------------------------------------------------------------===//
19 
20 #include "Support/DynamicLinker.h"
21 #include "Support/CommandLine.h"
22 #include "Config/dlfcn.h"
23 #include "Config/link.h"
24 #include <iostream>
25 
26 namespace llvm {
27 
28 namespace {
29   struct PluginLoader {
30     void operator=(const std::string &Filename) {
31       std::string ErrorMessage;
32       if (LinkDynamicObject (Filename.c_str (), &ErrorMessage))
33         std::cerr << "Error opening '" << Filename << "': " << ErrorMessage
34                   << "\n  -load request ignored.\n";
35     }
36   };
37 }
38 
39 // This causes operator= above to be invoked for every -load option.
40 static cl::opt<PluginLoader, false, cl::parser<std::string> >
41 LoadOpt("load", cl::ZeroOrMore, cl::value_desc("plugin.so"),
42         cl::desc("Load the specified plugin"));
43 
44 } // End llvm namespace
45