| //===-lto.cpp - LLVM Link Time Optimizer ----------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements the Link Time Optimization library. This library is |
| // intended to be used by linker to optimize code at link time. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm-c/lto.h" |
| #include "llvm/ADT/STLExtras.h" |
| #include "llvm/CodeGen/CommandFlags.h" |
| #include "llvm/IR/LLVMContext.h" |
| #include "llvm/LTO/LTOCodeGenerator.h" |
| #include "llvm/LTO/LTOModule.h" |
| #include "llvm/Support/MemoryBuffer.h" |
| #include "llvm/Support/Signals.h" |
| #include "llvm/Support/TargetSelect.h" |
| |
| // extra command-line flags needed for LTOCodeGenerator |
| 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")); |
| |
| // Holds most recent error string. |
| // *** Not thread safe *** |
| static std::string sLastErrorString; |
| |
| // Holds the initialization state of the LTO module. |
| // *** Not thread safe *** |
| static bool initialized = false; |
| |
| // Holds the command-line option parsing state of the LTO module. |
| static bool parsedOptions = false; |
| |
| // Initialize the configured targets if they have not been initialized. |
| static void lto_initialize() { |
| if (!initialized) { |
| #ifdef LLVM_ON_WIN32 |
| // Dialog box on crash disabling doesn't work across DLL boundaries, so do |
| // it here. |
| llvm::sys::DisableSystemDialogsOnCrash(); |
| #endif |
| |
| InitializeAllTargetInfos(); |
| InitializeAllTargets(); |
| InitializeAllTargetMCs(); |
| InitializeAllAsmParsers(); |
| InitializeAllAsmPrinters(); |
| InitializeAllDisassemblers(); |
| initialized = true; |
| } |
| } |
| |
| namespace { |
| |
| // This derived class owns the native object file. This helps implement the |
| // libLTO API semantics, which require that the code generator owns the object |
| // file. |
| struct LibLTOCodeGenerator : LTOCodeGenerator { |
| LibLTOCodeGenerator() {} |
| LibLTOCodeGenerator(std::unique_ptr<LLVMContext> Context) |
| : LTOCodeGenerator(std::move(Context)) {} |
| |
| std::unique_ptr<MemoryBuffer> NativeObjectFile; |
| }; |
| |
| } |
| |
| DEFINE_SIMPLE_CONVERSION_FUNCTIONS(LibLTOCodeGenerator, lto_code_gen_t) |
| DEFINE_SIMPLE_CONVERSION_FUNCTIONS(LTOModule, lto_module_t) |
| |
| // Convert the subtarget features into a string to pass to LTOCodeGenerator. |
| static void lto_add_attrs(lto_code_gen_t cg) { |
| LTOCodeGenerator *CG = unwrap(cg); |
| if (MAttrs.size()) { |
| std::string attrs; |
| for (unsigned i = 0; i < MAttrs.size(); ++i) { |
| if (i > 0) |
| attrs.append(","); |
| attrs.append(MAttrs[i]); |
| } |
| |
| CG->setAttr(attrs.c_str()); |
| } |
| |
| if (OptLevel < '0' || OptLevel > '3') |
| report_fatal_error("Optimization level must be between 0 and 3"); |
| CG->setOptLevel(OptLevel - '0'); |
| } |
| |
| extern const char* lto_get_version() { |
| return LTOCodeGenerator::getVersionString(); |
| } |
| |
| const char* lto_get_error_message() { |
| return sLastErrorString.c_str(); |
| } |
| |
| bool lto_module_is_object_file(const char* path) { |
| return LTOModule::isBitcodeFile(path); |
| } |
| |
| bool lto_module_is_object_file_for_target(const char* path, |
| const char* target_triplet_prefix) { |
| ErrorOr<std::unique_ptr<MemoryBuffer>> Buffer = MemoryBuffer::getFile(path); |
| if (!Buffer) |
| return false; |
| return LTOModule::isBitcodeForTarget(Buffer->get(), target_triplet_prefix); |
| } |
| |
| bool lto_module_is_object_file_in_memory(const void* mem, size_t length) { |
| return LTOModule::isBitcodeFile(mem, length); |
| } |
| |
| bool |
| lto_module_is_object_file_in_memory_for_target(const void* mem, |
| size_t length, |
| const char* target_triplet_prefix) { |
| std::unique_ptr<MemoryBuffer> buffer(LTOModule::makeBuffer(mem, length)); |
| if (!buffer) |
| return false; |
| return LTOModule::isBitcodeForTarget(buffer.get(), target_triplet_prefix); |
| } |
| |
| lto_module_t lto_module_create(const char* path) { |
| lto_initialize(); |
| llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags(); |
| return wrap(LTOModule::createFromFile(path, Options, sLastErrorString)); |
| } |
| |
| lto_module_t lto_module_create_from_fd(int fd, const char *path, size_t size) { |
| lto_initialize(); |
| llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags(); |
| return wrap( |
| LTOModule::createFromOpenFile(fd, path, size, Options, sLastErrorString)); |
| } |
| |
| lto_module_t lto_module_create_from_fd_at_offset(int fd, const char *path, |
| size_t file_size, |
| size_t map_size, |
| off_t offset) { |
| lto_initialize(); |
| llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags(); |
| return wrap(LTOModule::createFromOpenFileSlice(fd, path, map_size, offset, |
| Options, sLastErrorString)); |
| } |
| |
| lto_module_t lto_module_create_from_memory(const void* mem, size_t length) { |
| lto_initialize(); |
| llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags(); |
| return wrap(LTOModule::createFromBuffer(mem, length, Options, sLastErrorString)); |
| } |
| |
| lto_module_t lto_module_create_from_memory_with_path(const void* mem, |
| size_t length, |
| const char *path) { |
| lto_initialize(); |
| llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags(); |
| return wrap( |
| LTOModule::createFromBuffer(mem, length, Options, sLastErrorString, path)); |
| } |
| |
| lto_module_t lto_module_create_in_local_context(const void *mem, size_t length, |
| const char *path) { |
| lto_initialize(); |
| llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags(); |
| return wrap(LTOModule::createInLocalContext(mem, length, Options, |
| sLastErrorString, path)); |
| } |
| |
| lto_module_t lto_module_create_in_codegen_context(const void *mem, |
| size_t length, |
| const char *path, |
| lto_code_gen_t cg) { |
| lto_initialize(); |
| llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags(); |
| return wrap(LTOModule::createInContext(mem, length, Options, sLastErrorString, |
| path, &unwrap(cg)->getContext())); |
| } |
| |
| void lto_module_dispose(lto_module_t mod) { delete unwrap(mod); } |
| |
| const char* lto_module_get_target_triple(lto_module_t mod) { |
| return unwrap(mod)->getTargetTriple().c_str(); |
| } |
| |
| void lto_module_set_target_triple(lto_module_t mod, const char *triple) { |
| return unwrap(mod)->setTargetTriple(triple); |
| } |
| |
| unsigned int lto_module_get_num_symbols(lto_module_t mod) { |
| return unwrap(mod)->getSymbolCount(); |
| } |
| |
| const char* lto_module_get_symbol_name(lto_module_t mod, unsigned int index) { |
| return unwrap(mod)->getSymbolName(index); |
| } |
| |
| lto_symbol_attributes lto_module_get_symbol_attribute(lto_module_t mod, |
| unsigned int index) { |
| return unwrap(mod)->getSymbolAttributes(index); |
| } |
| |
| unsigned int lto_module_get_num_deplibs(lto_module_t mod) { |
| return unwrap(mod)->getDependentLibraryCount(); |
| } |
| |
| const char* lto_module_get_deplib(lto_module_t mod, unsigned int index) { |
| return unwrap(mod)->getDependentLibrary(index); |
| } |
| |
| unsigned int lto_module_get_num_linkeropts(lto_module_t mod) { |
| return unwrap(mod)->getLinkerOptCount(); |
| } |
| |
| const char* lto_module_get_linkeropt(lto_module_t mod, unsigned int index) { |
| return unwrap(mod)->getLinkerOpt(index); |
| } |
| |
| void lto_codegen_set_diagnostic_handler(lto_code_gen_t cg, |
| lto_diagnostic_handler_t diag_handler, |
| void *ctxt) { |
| unwrap(cg)->setDiagnosticHandler(diag_handler, ctxt); |
| } |
| |
| static lto_code_gen_t createCodeGen(bool InLocalContext) { |
| lto_initialize(); |
| |
| TargetOptions Options = InitTargetOptionsFromCodeGenFlags(); |
| |
| LibLTOCodeGenerator *CodeGen = |
| InLocalContext ? new LibLTOCodeGenerator(make_unique<LLVMContext>()) |
| : new LibLTOCodeGenerator(); |
| CodeGen->setTargetOptions(Options); |
| return wrap(CodeGen); |
| } |
| |
| lto_code_gen_t lto_codegen_create(void) { |
| return createCodeGen(/* InLocalContext */ false); |
| } |
| |
| lto_code_gen_t lto_codegen_create_in_local_context(void) { |
| return createCodeGen(/* InLocalContext */ true); |
| } |
| |
| void lto_codegen_dispose(lto_code_gen_t cg) { delete unwrap(cg); } |
| |
| bool lto_codegen_add_module(lto_code_gen_t cg, lto_module_t mod) { |
| return !unwrap(cg)->addModule(unwrap(mod)); |
| } |
| |
| void lto_codegen_set_module(lto_code_gen_t cg, lto_module_t mod) { |
| unwrap(cg)->setModule(unwrap(mod)); |
| } |
| |
| bool lto_codegen_set_debug_model(lto_code_gen_t cg, lto_debug_model debug) { |
| unwrap(cg)->setDebugInfo(debug); |
| return false; |
| } |
| |
| bool lto_codegen_set_pic_model(lto_code_gen_t cg, lto_codegen_model model) { |
| unwrap(cg)->setCodePICModel(model); |
| return false; |
| } |
| |
| void lto_codegen_set_cpu(lto_code_gen_t cg, const char *cpu) { |
| return unwrap(cg)->setCpu(cpu); |
| } |
| |
| void lto_codegen_set_assembler_path(lto_code_gen_t cg, const char *path) { |
| // In here only for backwards compatibility. We use MC now. |
| } |
| |
| void lto_codegen_set_assembler_args(lto_code_gen_t cg, const char **args, |
| int nargs) { |
| // In here only for backwards compatibility. We use MC now. |
| } |
| |
| void lto_codegen_add_must_preserve_symbol(lto_code_gen_t cg, |
| const char *symbol) { |
| unwrap(cg)->addMustPreserveSymbol(symbol); |
| } |
| |
| static void maybeParseOptions(lto_code_gen_t cg) { |
| if (!parsedOptions) { |
| unwrap(cg)->parseCodeGenDebugOptions(); |
| lto_add_attrs(cg); |
| parsedOptions = true; |
| } |
| } |
| |
| bool lto_codegen_write_merged_modules(lto_code_gen_t cg, const char *path) { |
| maybeParseOptions(cg); |
| return !unwrap(cg)->writeMergedModules(path, sLastErrorString); |
| } |
| |
| const void *lto_codegen_compile(lto_code_gen_t cg, size_t *length) { |
| maybeParseOptions(cg); |
| LibLTOCodeGenerator *CG = unwrap(cg); |
| CG->NativeObjectFile = CG->compile(DisableInline, DisableGVNLoadPRE, |
| DisableLTOVectorization, sLastErrorString); |
| if (!CG->NativeObjectFile) |
| return nullptr; |
| *length = CG->NativeObjectFile->getBufferSize(); |
| return CG->NativeObjectFile->getBufferStart(); |
| } |
| |
| bool lto_codegen_optimize(lto_code_gen_t cg) { |
| maybeParseOptions(cg); |
| return !unwrap(cg)->optimize(DisableInline, |
| DisableGVNLoadPRE, DisableLTOVectorization, |
| sLastErrorString); |
| } |
| |
| const void *lto_codegen_compile_optimized(lto_code_gen_t cg, size_t *length) { |
| maybeParseOptions(cg); |
| LibLTOCodeGenerator *CG = unwrap(cg); |
| CG->NativeObjectFile = CG->compileOptimized(sLastErrorString); |
| if (!CG->NativeObjectFile) |
| return nullptr; |
| *length = CG->NativeObjectFile->getBufferSize(); |
| return CG->NativeObjectFile->getBufferStart(); |
| } |
| |
| bool lto_codegen_compile_to_file(lto_code_gen_t cg, const char **name) { |
| maybeParseOptions(cg); |
| return !unwrap(cg)->compile_to_file( |
| name, DisableInline, DisableGVNLoadPRE, |
| DisableLTOVectorization, sLastErrorString); |
| } |
| |
| void lto_codegen_debug_options(lto_code_gen_t cg, const char *opt) { |
| unwrap(cg)->setCodeGenDebugOptions(opt); |
| } |
| |
| unsigned int lto_api_version() { return LTO_API_VERSION; } |
| |
| void lto_codegen_set_should_internalize(lto_code_gen_t cg, |
| bool ShouldInternalize) { |
| unwrap(cg)->setShouldInternalize(ShouldInternalize); |
| } |
| |
| void lto_codegen_set_should_embed_uselists(lto_code_gen_t cg, |
| lto_bool_t ShouldEmbedUselists) { |
| unwrap(cg)->setShouldEmbedUselists(ShouldEmbedUselists); |
| } |