llvm-link.cpp revision 256281
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> 30using namespace llvm; 31 32static cl::list<std::string> 33InputFilenames(cl::Positional, cl::OneOrMore, 34 cl::desc("<input bitcode files>")); 35 36static cl::opt<std::string> 37OutputFilename("o", cl::desc("Override output filename"), cl::init("-"), 38 cl::value_desc("filename")); 39 40static cl::opt<bool> 41Force("f", cl::desc("Enable binary output on terminals")); 42 43static cl::opt<bool> 44OutputAssembly("S", 45 cl::desc("Write output as LLVM assembly"), cl::Hidden); 46 47static cl::opt<bool> 48Verbose("v", cl::desc("Print information about actions taken")); 49 50static cl::opt<bool> 51DumpAsm("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// 56static inline Module *LoadFile(const char *argv0, const std::string &FN, 57 LLVMContext& Context) { 58 sys::Path Filename; 59 if (!Filename.set(FN)) { 60 errs() << "Invalid file name: '" << FN << "'\n"; 61 return NULL; 62 } 63 64 SMDiagnostic Err; 65 if (Verbose) errs() << "Loading '" << Filename.c_str() << "'\n"; 66 Module* Result = 0; 67 68 const std::string &FNStr = Filename.str(); 69 Result = ParseIRFile(FNStr, Err, Context); 70 if (Result) return Result; // Load successful! 71 72 Err.print(argv0, errs()); 73 return NULL; 74} 75 76int main(int argc, char **argv) { 77 // Print a stack trace if we signal out. 78 sys::PrintStackTraceOnErrorSignal(); 79 PrettyStackTraceProgram X(argc, argv); 80 81 LLVMContext &Context = getGlobalContext(); 82 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit. 83 cl::ParseCommandLineOptions(argc, argv, "llvm linker\n"); 84 85 unsigned BaseArg = 0; 86 std::string ErrorMessage; 87 88 OwningPtr<Module> Composite(LoadFile(argv[0], 89 InputFilenames[BaseArg], Context)); 90 if (Composite.get() == 0) { 91 errs() << argv[0] << ": error loading file '" 92 << InputFilenames[BaseArg] << "'\n"; 93 return 1; 94 } 95 96 Linker L(Composite.get()); 97 for (unsigned i = BaseArg+1; i < InputFilenames.size(); ++i) { 98 OwningPtr<Module> M(LoadFile(argv[0], InputFilenames[i], Context)); 99 if (M.get() == 0) { 100 errs() << argv[0] << ": error loading file '" <<InputFilenames[i]<< "'\n"; 101 return 1; 102 } 103 104 if (Verbose) errs() << "Linking in '" << InputFilenames[i] << "'\n"; 105 106 if (L.linkInModule(M.get(), &ErrorMessage)) { 107 errs() << argv[0] << ": link error in '" << InputFilenames[i] 108 << "': " << ErrorMessage << "\n"; 109 return 1; 110 } 111 } 112 113 if (DumpAsm) errs() << "Here's the assembly:\n" << *Composite; 114 115 std::string ErrorInfo; 116 tool_output_file Out(OutputFilename.c_str(), ErrorInfo, 117 raw_fd_ostream::F_Binary); 118 if (!ErrorInfo.empty()) { 119 errs() << ErrorInfo << '\n'; 120 return 1; 121 } 122 123 if (verifyModule(*Composite)) { 124 errs() << argv[0] << ": linked module is broken!\n"; 125 return 1; 126 } 127 128 if (Verbose) errs() << "Writing bitcode...\n"; 129 if (OutputAssembly) { 130 Out.os() << *Composite; 131 } else if (Force || !CheckBitcodeOutputToConsole(Out.os(), true)) 132 WriteBitcodeToFile(Composite.get(), Out.os()); 133 134 // Declare success. 135 Out.keep(); 136 137 return 0; 138} 139