| //===-- 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/ADT/StringSet.h" |
| #include "llvm/CodeGen/CommandFlags.h" |
| #include "llvm/LTO/LTOCodeGenerator.h" |
| #include "llvm/LTO/LTOModule.h" |
| #include "llvm/Support/CommandLine.h" |
| #include "llvm/Support/FileSystem.h" |
| #include "llvm/Support/ManagedStatic.h" |
| #include "llvm/Support/PrettyStackTrace.h" |
| #include "llvm/Support/Signals.h" |
| #include "llvm/Support/TargetSelect.h" |
| #include "llvm/Support/raw_ostream.h" |
| |
| using namespace llvm; |
| |
| static cl::opt<char> |
| OptLevel("O", |
| cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] " |
| "(default = '-O2')"), |
| cl::Prefix, |
| cl::ZeroOrMore, |
| cl::init('2')); |
| |
| static cl::opt<bool> |
| DisableInline("disable-inlining", cl::init(false), |
| cl::desc("Do not run the inliner pass")); |
| |
| static cl::opt<bool> |
| DisableGVNLoadPRE("disable-gvn-loadpre", cl::init(false), |
| cl::desc("Do not run the GVN load PRE pass")); |
| |
| static cl::opt<bool> |
| DisableLTOVectorization("disable-lto-vectorization", cl::init(false), |
| cl::desc("Do not run loop or slp vectorization during LTO")); |
| |
| static cl::opt<bool> |
| UseDiagnosticHandler("use-diagnostic-handler", cl::init(false), |
| cl::desc("Use a diagnostic handler to test the handler interface")); |
| |
| static cl::list<std::string> |
| InputFilenames(cl::Positional, cl::OneOrMore, |
| cl::desc("<input bitcode files>")); |
| |
| static cl::opt<std::string> |
| OutputFilename("o", cl::init(""), |
| cl::desc("Override output filename"), |
| cl::value_desc("filename")); |
| |
| static cl::list<std::string> |
| ExportedSymbols("exported-symbol", |
| cl::desc("Symbol to export from the resulting object file"), |
| cl::ZeroOrMore); |
| |
| static cl::list<std::string> |
| DSOSymbols("dso-symbol", |
| cl::desc("Symbol to put in the symtab in the resulting dso"), |
| cl::ZeroOrMore); |
| |
| static cl::opt<bool> ListSymbolsOnly( |
| "list-symbols-only", cl::init(false), |
| cl::desc("Instead of running LTO, list the symbols in each IR file")); |
| |
| static cl::opt<bool> SetMergedModule( |
| "set-merged-module", cl::init(false), |
| cl::desc("Use the first input module as the merged module")); |
| |
| namespace { |
| struct ModuleInfo { |
| std::vector<bool> CanBeHidden; |
| }; |
| } |
| |
| static void handleDiagnostics(lto_codegen_diagnostic_severity_t Severity, |
| const char *Msg, void *) { |
| switch (Severity) { |
| case LTO_DS_NOTE: |
| errs() << "note: "; |
| break; |
| case LTO_DS_REMARK: |
| errs() << "remark: "; |
| break; |
| case LTO_DS_ERROR: |
| errs() << "error: "; |
| break; |
| case LTO_DS_WARNING: |
| errs() << "warning: "; |
| break; |
| } |
| errs() << Msg << "\n"; |
| } |
| |
| static std::unique_ptr<LTOModule> |
| getLocalLTOModule(StringRef Path, std::unique_ptr<MemoryBuffer> &Buffer, |
| const TargetOptions &Options, std::string &Error) { |
| ErrorOr<std::unique_ptr<MemoryBuffer>> BufferOrErr = |
| MemoryBuffer::getFile(Path); |
| if (std::error_code EC = BufferOrErr.getError()) { |
| Error = EC.message(); |
| return nullptr; |
| } |
| Buffer = std::move(BufferOrErr.get()); |
| return std::unique_ptr<LTOModule>(LTOModule::createInLocalContext( |
| Buffer->getBufferStart(), Buffer->getBufferSize(), Options, Error, Path)); |
| } |
| |
| /// \brief List symbols in each IR file. |
| /// |
| /// The main point here is to provide lit-testable coverage for the LTOModule |
| /// functionality that's exposed by the C API to list symbols. Moreover, this |
| /// provides testing coverage for modules that have been created in their own |
| /// contexts. |
| static int listSymbols(StringRef Command, const TargetOptions &Options) { |
| for (auto &Filename : InputFilenames) { |
| std::string Error; |
| std::unique_ptr<MemoryBuffer> Buffer; |
| std::unique_ptr<LTOModule> Module = |
| getLocalLTOModule(Filename, Buffer, Options, Error); |
| if (!Module) { |
| errs() << Command << ": error loading file '" << Filename |
| << "': " << Error << "\n"; |
| return 1; |
| } |
| |
| // List the symbols. |
| outs() << Filename << ":\n"; |
| for (int I = 0, E = Module->getSymbolCount(); I != E; ++I) |
| outs() << Module->getSymbolName(I) << "\n"; |
| } |
| return 0; |
| } |
| |
| 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); |
| |
| unsigned BaseArg = 0; |
| |
| LTOCodeGenerator CodeGen; |
| |
| if (UseDiagnosticHandler) |
| CodeGen.setDiagnosticHandler(handleDiagnostics, nullptr); |
| |
| switch (RelocModel) { |
| case Reloc::Static: |
| CodeGen.setCodePICModel(LTO_CODEGEN_PIC_MODEL_STATIC); |
| break; |
| case Reloc::PIC_: |
| CodeGen.setCodePICModel(LTO_CODEGEN_PIC_MODEL_DYNAMIC); |
| break; |
| case Reloc::DynamicNoPIC: |
| CodeGen.setCodePICModel(LTO_CODEGEN_PIC_MODEL_DYNAMIC_NO_PIC); |
| break; |
| default: |
| CodeGen.setCodePICModel(LTO_CODEGEN_PIC_MODEL_DEFAULT); |
| } |
| |
| 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; |
| } |
| |
| LTOModule *LTOMod = Module.get(); |
| |
| // 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(Module.release()); |
| } 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; |
| } |
| |
| unsigned NumSyms = LTOMod->getSymbolCount(); |
| for (unsigned I = 0; I < NumSyms; ++I) { |
| StringRef Name = LTOMod->getSymbolName(I); |
| if (!DSOSymbolsSet.count(Name)) |
| continue; |
| lto_symbol_attributes Attrs = LTOMod->getSymbolAttributes(I); |
| unsigned Scope = Attrs & LTO_SYMBOL_SCOPE_MASK; |
| if (Scope != LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN) |
| KeptDSOSyms.push_back(Name); |
| } |
| } |
| |
| // 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 (!OutputFilename.empty()) { |
| std::string ErrorInfo; |
| std::unique_ptr<MemoryBuffer> Code = CodeGen.compile( |
| DisableInline, DisableGVNLoadPRE, DisableLTOVectorization, ErrorInfo); |
| if (!Code) { |
| errs() << argv[0] |
| << ": error compiling the code: " << ErrorInfo << "\n"; |
| return 1; |
| } |
| |
| std::error_code EC; |
| raw_fd_ostream FileStream(OutputFilename, EC, sys::fs::F_None); |
| if (EC) { |
| errs() << argv[0] << ": error opening the file '" << OutputFilename |
| << "': " << EC.message() << "\n"; |
| return 1; |
| } |
| |
| FileStream.write(Code->getBufferStart(), Code->getBufferSize()); |
| } else { |
| std::string ErrorInfo; |
| const char *OutputName = nullptr; |
| if (!CodeGen.compile_to_file(&OutputName, DisableInline, |
| DisableGVNLoadPRE, DisableLTOVectorization, |
| ErrorInfo)) { |
| errs() << argv[0] |
| << ": error compiling the code: " << ErrorInfo |
| << "\n"; |
| return 1; |
| } |
| |
| outs() << "Wrote native object file '" << OutputName << "'\n"; |
| } |
| |
| return 0; |
| } |