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 using namespace llvm; 26 27 namespace { 28 struct PluginLoader { 29 void operator=(const std::string &Filename) { 30 std::string ErrorMessage; 31 if (LinkDynamicObject (Filename.c_str (), &ErrorMessage)) 32 std::cerr << "Error opening '" << Filename << "': " << ErrorMessage 33 << "\n -load request ignored.\n"; 34 } 35 }; 36 } 37 38 // This causes operator= above to be invoked for every -load option. 39 static cl::opt<PluginLoader, false, cl::parser<std::string> > 40 LoadOpt("load", cl::ZeroOrMore, cl::value_desc("plugin.so"), 41 cl::desc("Load the specified plugin")); 42