1//===- llvm-link.cpp - Low-level LLVM linker ------------------------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This utility may be invoked in the following manner: 11// llvm-link a.bc b.bc c.bc -o x.bc 12// 13//===----------------------------------------------------------------------===// 14 15#include "llvm/Linker/Linker.h" 16#include "llvm/Bitcode/ReaderWriter.h" 17#include "llvm/IR/LLVMContext.h" 18#include "llvm/IR/Module.h" 19#include "llvm/IR/Verifier.h" 20#include "llvm/IRReader/IRReader.h" 21#include "llvm/Support/CommandLine.h" 22#include "llvm/Support/FileSystem.h" 23#include "llvm/Support/ManagedStatic.h" 24#include "llvm/Support/Path.h" 25#include "llvm/Support/PrettyStackTrace.h" 26#include "llvm/Support/Signals.h" 27#include "llvm/Support/SourceMgr.h" 28#include "llvm/Support/SystemUtils.h" 29#include "llvm/Support/ToolOutputFile.h" 30#include <memory> 31using namespace llvm; 32 33static cl::list<std::string> 34InputFilenames(cl::Positional, cl::OneOrMore, 35 cl::desc("<input bitcode files>")); 36 37static cl::opt<std::string> 38OutputFilename("o", cl::desc("Override output filename"), cl::init("-"), 39 cl::value_desc("filename")); 40 41static cl::opt<bool> 42Force("f", cl::desc("Enable binary output on terminals")); 43 44static cl::opt<bool> 45OutputAssembly("S", 46 cl::desc("Write output as LLVM assembly"), cl::Hidden); 47 48static cl::opt<bool> 49Verbose("v", cl::desc("Print information about actions taken")); 50 51static cl::opt<bool> 52DumpAsm("d", cl::desc("Print assembly as linked"), cl::Hidden); 53 54static cl::opt<bool> 55SuppressWarnings("suppress-warnings", cl::desc("Suppress all linking warnings"), 56 cl::init(false)); 57 58// LoadFile - Read the specified bitcode file in and return it. This routine 59// searches the link path for the specified file to try to find it... 60// 61static inline Module *LoadFile(const char *argv0, const std::string &FN, 62 LLVMContext& Context) { 63 SMDiagnostic Err; 64 if (Verbose) errs() << "Loading '" << FN << "'\n"; 65 Module* Result = nullptr; 66 67 Result = ParseIRFile(FN, Err, Context); 68 if (Result) return Result; // Load successful! 69 70 Err.print(argv0, errs()); 71 return nullptr; 72} 73 74int main(int argc, char **argv) { 75 // Print a stack trace if we signal out. 76 sys::PrintStackTraceOnErrorSignal(); 77 PrettyStackTraceProgram X(argc, argv); 78 79 LLVMContext &Context = getGlobalContext(); 80 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit. 81 cl::ParseCommandLineOptions(argc, argv, "llvm linker\n"); 82 83 unsigned BaseArg = 0; 84 std::string ErrorMessage; 85 86 std::unique_ptr<Module> Composite( 87 LoadFile(argv[0], InputFilenames[BaseArg], Context)); 88 if (!Composite.get()) { 89 errs() << argv[0] << ": error loading file '" 90 << InputFilenames[BaseArg] << "'\n"; 91 return 1; 92 } 93 94 Linker L(Composite.get(), SuppressWarnings); 95 for (unsigned i = BaseArg+1; i < InputFilenames.size(); ++i) { 96 std::unique_ptr<Module> M(LoadFile(argv[0], InputFilenames[i], Context)); 97 if (!M.get()) { 98 errs() << argv[0] << ": error loading file '" <<InputFilenames[i]<< "'\n"; 99 return 1; 100 } 101 102 if (Verbose) errs() << "Linking in '" << InputFilenames[i] << "'\n"; 103 104 if (L.linkInModule(M.get(), &ErrorMessage)) { 105 errs() << argv[0] << ": link error in '" << InputFilenames[i] 106 << "': " << ErrorMessage << "\n"; 107 return 1; 108 } 109 } 110 111 if (DumpAsm) errs() << "Here's the assembly:\n" << *Composite; 112 113 std::string ErrorInfo; 114 tool_output_file Out(OutputFilename.c_str(), ErrorInfo, sys::fs::F_None); 115 if (!ErrorInfo.empty()) { 116 errs() << ErrorInfo << '\n'; 117 return 1; 118 } 119 120 if (verifyModule(*Composite)) { 121 errs() << argv[0] << ": linked module is broken!\n"; 122 return 1; 123 } 124 125 if (Verbose) errs() << "Writing bitcode...\n"; 126 if (OutputAssembly) { 127 Out.os() << *Composite; 128 } else if (Force || !CheckBitcodeOutputToConsole(Out.os(), true)) 129 WriteBitcodeToFile(Composite.get(), Out.os()); 130 131 // Declare success. 132 Out.keep(); 133 134 return 0; 135} 136