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