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104 lines
3.4 KiB
C++
104 lines
3.4 KiB
C++
//===-- llvm-lto: a simple command-line program to link modules with LTO --===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This program takes in a list of bitcode files, links them, performs link-time
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// optimization, and outputs an object file.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm-c/lto.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/PrettyStackTrace.h"
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#include "llvm/Support/Signals.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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static cl::list<std::string> InputFilenames(cl::Positional, cl::OneOrMore,
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cl::desc("<input bitcode files>"));
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static cl::opt<std::string> OutputFilename("o",
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cl::desc("Override output filename"),
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cl::init(""),
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cl::value_desc("filename"));
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int main(int argc, char **argv) {
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// Print a stack trace if we signal out.
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sys::PrintStackTraceOnErrorSignal();
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PrettyStackTraceProgram X(argc, argv);
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llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
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cl::ParseCommandLineOptions(argc, argv, "llvm LTO linker\n");
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unsigned BaseArg = 0;
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std::string ErrorMessage;
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lto_code_gen_t code_gen = lto_codegen_create();
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if (code_gen == NULL)
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errs() << argv[0] << ": error creating a code generation module: "
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<< lto_get_error_message() << "\n";
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lto_codegen_set_pic_model(code_gen, LTO_CODEGEN_PIC_MODEL_DYNAMIC);
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lto_codegen_set_debug_model(code_gen, LTO_DEBUG_MODEL_DWARF);
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for (unsigned i = BaseArg; i < InputFilenames.size(); ++i) {
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lto_module_t BitcodeModule = lto_module_create(InputFilenames[i].c_str());
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if (BitcodeModule == NULL) {
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errs() << argv[0] << ": error loading file '" << InputFilenames[i]
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<< "': " << lto_get_error_message() << "\n";
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return 1;
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}
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if (lto_codegen_add_module(code_gen, BitcodeModule)) {
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errs() << argv[0] << ": error adding file '" << InputFilenames[i]
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<< "': " << lto_get_error_message() << "\n";
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lto_module_dispose(BitcodeModule);
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return 1;
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}
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lto_module_dispose(BitcodeModule);
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}
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if (!OutputFilename.empty()) {
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size_t len = 0;
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const void *Code = lto_codegen_compile(code_gen, &len);
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if (Code == NULL) {
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errs() << argv[0]
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<< ": error compiling the code: " << lto_get_error_message()
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<< "\n";
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return 1;
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}
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std::string ErrorInfo;
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raw_fd_ostream FileStream(OutputFilename.c_str(), ErrorInfo);
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if (!ErrorInfo.empty()) {
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errs() << argv[0] << ": error opening the file '" << OutputFilename
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<< "': " << ErrorInfo << "\n";
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return 1;
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}
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FileStream.write(reinterpret_cast<const char *>(Code), len);
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} else {
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const char *OutputName = NULL;
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if (lto_codegen_compile_to_file(code_gen, &OutputName)) {
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errs() << argv[0]
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<< ": error compiling the code: " << lto_get_error_message()
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<< "\n";
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return 1;
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}
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outs() << "Wrote native object file '" << OutputName << "'\n";
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}
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lto_codegen_dispose(code_gen);
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return 0;
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}
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