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