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");
if (OptLevel < '0' || OptLevel > '3') {
errs() << argv[0] << ": optimization level must be between 0 and 3\n";
return 1;
}
// Initialize the configured targets.
InitializeAllTargets();
InitializeAllTargetMCs();
InitializeAllAsmPrinters();
InitializeAllAsmParsers();
// set up the TargetOptions for the machine
TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
if (ListSymbolsOnly)
return listSymbols(argv[0], Options);
if (ThinLTO)
return createCombinedFunctionIndex(argv[0]);
unsigned BaseArg = 0;
LTOCodeGenerator CodeGen;
if (UseDiagnosticHandler)
CodeGen.setDiagnosticHandler(handleDiagnostics, nullptr);
CodeGen.setCodePICModel(RelocModel);
CodeGen.setDebugInfo(LTO_DEBUG_MODEL_DWARF);
CodeGen.setTargetOptions(Options);
llvm::StringSet<llvm::MallocAllocator> DSOSymbolsSet;
for (unsigned i = 0; i < DSOSymbols.size(); ++i)
DSOSymbolsSet.insert(DSOSymbols[i]);
std::vector<std::string> KeptDSOSyms;
for (unsigned i = BaseArg; i < InputFilenames.size(); ++i) {
std::string error;
std::unique_ptr<LTOModule> Module(
LTOModule::createFromFile(InputFilenames[i].c_str(), Options, error));
if (!error.empty()) {
errs() << argv[0] << ": error loading file '" << InputFilenames[i]
<< "': " << error << "\n";
return 1;
}
unsigned NumSyms = Module->getSymbolCount();
for (unsigned I = 0; I < NumSyms; ++I) {
StringRef Name = Module->getSymbolName(I);
if (!DSOSymbolsSet.count(Name))
continue;
lto_symbol_attributes Attrs = Module->getSymbolAttributes(I);
unsigned Scope = Attrs & LTO_SYMBOL_SCOPE_MASK;
if (Scope != LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN)
KeptDSOSyms.push_back(Name);
}
// We use the first input module as the destination module when
// SetMergedModule is true.
if (SetMergedModule && i == BaseArg) {
// Transfer ownership to the code generator.
CodeGen.setModule(std::move(Module));
} else if (!CodeGen.addModule(Module.get())) {
// Print a message here so that we know addModule() did not abort.
errs() << argv[0] << ": error adding file '" << InputFilenames[i] << "'\n";
return 1;
}
}
// Add all the exported symbols to the table of symbols to preserve.
for (unsigned i = 0; i < ExportedSymbols.size(); ++i)
CodeGen.addMustPreserveSymbol(ExportedSymbols[i].c_str());
// Add all the dso symbols to the table of symbols to expose.
for (unsigned i = 0; i < KeptDSOSyms.size(); ++i)
CodeGen.addMustPreserveSymbol(KeptDSOSyms[i].c_str());
// Set cpu and attrs strings for the default target/subtarget.
CodeGen.setCpu(MCPU.c_str());
CodeGen.setOptLevel(OptLevel - '0');
std::string attrs;
for (unsigned i = 0; i < MAttrs.size(); ++i) {
if (i > 0)
attrs.append(",");
attrs.append(MAttrs[i]);
}
if (!attrs.empty())
CodeGen.setAttr(attrs.c_str());
if (FileType.getNumOccurrences())
CodeGen.setFileType(FileType);
if (!OutputFilename.empty()) {
if (!CodeGen.optimize(DisableVerify, DisableInline, DisableGVNLoadPRE,
DisableLTOVectorization)) {
// Diagnostic messages should have been printed by the handler.
errs() << argv[0] << ": error optimizing the code\n";
return 1;
}
if (SaveModuleFile) {
std::string ModuleFilename = OutputFilename;
ModuleFilename += ".merged.bc";
std::string ErrMsg;
if (!CodeGen.writeMergedModules(ModuleFilename.c_str())) {
errs() << argv[0] << ": writing merged module failed.\n";
return 1;
}
}
std::list<tool_output_file> OSs;
std::vector<raw_pwrite_stream *> OSPtrs;
for (unsigned I = 0; I != Parallelism; ++I) {
std::string PartFilename = OutputFilename;
if (Parallelism != 1)
PartFilename += "." + utostr(I);
std::error_code EC;
OSs.emplace_back(PartFilename, EC, sys::fs::F_None);
if (EC) {
errs() << argv[0] << ": error opening the file '" << PartFilename
<< "': " << EC.message() << "\n";
return 1;
}
OSPtrs.push_back(&OSs.back().os());
}
if (!CodeGen.compileOptimized(OSPtrs)) {
// Diagnostic messages should have been printed by the handler.
errs() << argv[0] << ": error compiling the code\n";
return 1;
}
for (tool_output_file &OS : OSs)
OS.keep();
} else {
if (Parallelism != 1) {
errs() << argv[0] << ": -j must be specified together with -o\n";
return 1;
}
if (SaveModuleFile) {
errs() << argv[0] << ": -save-merged-module must be specified with -o\n";
return 1;
}
const char *OutputName = nullptr;
if (!CodeGen.compile_to_file(&OutputName, DisableVerify, DisableInline,
DisableGVNLoadPRE, DisableLTOVectorization)) {
// Diagnostic messages should have been printed by the handler.
errs() << argv[0] << ": error compiling the code\n";
return 1;
}
outs() << "Wrote native object file '" << OutputName << "'\n";
}
return 0;
}
