1 //===-lto.cpp - LLVM Link Time Optimizer ----------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the Link Time Optimization library. This library is
11 // intended to be used by linker to optimize code at link time.
13 //===----------------------------------------------------------------------===//
15 #include "llvm-c/lto.h"
16 #include "llvm/ADT/STLExtras.h"
17 #include "llvm/CodeGen/CommandFlags.h"
18 #include "llvm/IR/LLVMContext.h"
19 #include "llvm/LTO/LTOCodeGenerator.h"
20 #include "llvm/LTO/LTOModule.h"
21 #include "llvm/Support/MemoryBuffer.h"
22 #include "llvm/Support/Signals.h"
23 #include "llvm/Support/TargetSelect.h"
25 // extra command-line flags needed for LTOCodeGenerator
28 cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] "
35 DisableInline("disable-inlining", cl::init(false),
36 cl::desc("Do not run the inliner pass"));
39 DisableGVNLoadPRE("disable-gvn-loadpre", cl::init(false),
40 cl::desc("Do not run the GVN load PRE pass"));
43 DisableLTOVectorization("disable-lto-vectorization", cl::init(false),
44 cl::desc("Do not run loop or slp vectorization during LTO"));
47 static bool VerifyByDefault = false;
49 static bool VerifyByDefault = true;
52 static cl::opt<bool> DisableVerify(
53 "disable-llvm-verifier", cl::init(!VerifyByDefault),
54 cl::desc("Don't run the LLVM verifier during the optimization pipeline"));
56 // Holds most recent error string.
57 // *** Not thread safe ***
58 static std::string sLastErrorString;
60 // Holds the initialization state of the LTO module.
61 // *** Not thread safe ***
62 static bool initialized = false;
64 // Holds the command-line option parsing state of the LTO module.
65 static bool parsedOptions = false;
67 // Initialize the configured targets if they have not been initialized.
68 static void lto_initialize() {
71 // Dialog box on crash disabling doesn't work across DLL boundaries, so do
73 llvm::sys::DisableSystemDialogsOnCrash();
76 InitializeAllTargetInfos();
77 InitializeAllTargets();
78 InitializeAllTargetMCs();
79 InitializeAllAsmParsers();
80 InitializeAllAsmPrinters();
81 InitializeAllDisassemblers();
88 // This derived class owns the native object file. This helps implement the
89 // libLTO API semantics, which require that the code generator owns the object
91 struct LibLTOCodeGenerator : LTOCodeGenerator {
92 LibLTOCodeGenerator() {}
93 LibLTOCodeGenerator(std::unique_ptr<LLVMContext> Context)
94 : LTOCodeGenerator(std::move(Context)) {}
96 std::unique_ptr<MemoryBuffer> NativeObjectFile;
101 DEFINE_SIMPLE_CONVERSION_FUNCTIONS(LibLTOCodeGenerator, lto_code_gen_t)
102 DEFINE_SIMPLE_CONVERSION_FUNCTIONS(LTOModule, lto_module_t)
104 // Convert the subtarget features into a string to pass to LTOCodeGenerator.
105 static void lto_add_attrs(lto_code_gen_t cg) {
106 LTOCodeGenerator *CG = unwrap(cg);
109 for (unsigned i = 0; i < MAttrs.size(); ++i) {
112 attrs.append(MAttrs[i]);
115 CG->setAttr(attrs.c_str());
118 if (OptLevel < '0' || OptLevel > '3')
119 report_fatal_error("Optimization level must be between 0 and 3");
120 CG->setOptLevel(OptLevel - '0');
123 extern const char* lto_get_version() {
124 return LTOCodeGenerator::getVersionString();
127 const char* lto_get_error_message() {
128 return sLastErrorString.c_str();
131 bool lto_module_is_object_file(const char* path) {
132 return LTOModule::isBitcodeFile(path);
135 bool lto_module_is_object_file_for_target(const char* path,
136 const char* target_triplet_prefix) {
137 ErrorOr<std::unique_ptr<MemoryBuffer>> Buffer = MemoryBuffer::getFile(path);
140 return LTOModule::isBitcodeForTarget(Buffer->get(), target_triplet_prefix);
143 bool lto_module_is_object_file_in_memory(const void* mem, size_t length) {
144 return LTOModule::isBitcodeFile(mem, length);
148 lto_module_is_object_file_in_memory_for_target(const void* mem,
150 const char* target_triplet_prefix) {
151 std::unique_ptr<MemoryBuffer> buffer(LTOModule::makeBuffer(mem, length));
154 return LTOModule::isBitcodeForTarget(buffer.get(), target_triplet_prefix);
157 lto_module_t lto_module_create(const char* path) {
159 llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
160 return wrap(LTOModule::createFromFile(path, Options, sLastErrorString));
163 lto_module_t lto_module_create_from_fd(int fd, const char *path, size_t size) {
165 llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
167 LTOModule::createFromOpenFile(fd, path, size, Options, sLastErrorString));
170 lto_module_t lto_module_create_from_fd_at_offset(int fd, const char *path,
175 llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
176 return wrap(LTOModule::createFromOpenFileSlice(fd, path, map_size, offset,
177 Options, sLastErrorString));
180 lto_module_t lto_module_create_from_memory(const void* mem, size_t length) {
182 llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
183 return wrap(LTOModule::createFromBuffer(mem, length, Options, sLastErrorString));
186 lto_module_t lto_module_create_from_memory_with_path(const void* mem,
190 llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
192 LTOModule::createFromBuffer(mem, length, Options, sLastErrorString, path));
195 lto_module_t lto_module_create_in_local_context(const void *mem, size_t length,
198 llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
199 return wrap(LTOModule::createInLocalContext(mem, length, Options,
200 sLastErrorString, path));
203 lto_module_t lto_module_create_in_codegen_context(const void *mem,
208 llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
209 return wrap(LTOModule::createInContext(mem, length, Options, sLastErrorString,
210 path, &unwrap(cg)->getContext()));
213 void lto_module_dispose(lto_module_t mod) { delete unwrap(mod); }
215 const char* lto_module_get_target_triple(lto_module_t mod) {
216 return unwrap(mod)->getTargetTriple().c_str();
219 void lto_module_set_target_triple(lto_module_t mod, const char *triple) {
220 return unwrap(mod)->setTargetTriple(triple);
223 unsigned int lto_module_get_num_symbols(lto_module_t mod) {
224 return unwrap(mod)->getSymbolCount();
227 const char* lto_module_get_symbol_name(lto_module_t mod, unsigned int index) {
228 return unwrap(mod)->getSymbolName(index);
231 lto_symbol_attributes lto_module_get_symbol_attribute(lto_module_t mod,
232 unsigned int index) {
233 return unwrap(mod)->getSymbolAttributes(index);
236 const char* lto_module_get_linkeropts(lto_module_t mod) {
237 return unwrap(mod)->getLinkerOpts();
240 void lto_codegen_set_diagnostic_handler(lto_code_gen_t cg,
241 lto_diagnostic_handler_t diag_handler,
243 unwrap(cg)->setDiagnosticHandler(diag_handler, ctxt);
246 static lto_code_gen_t createCodeGen(bool InLocalContext) {
249 TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
251 LibLTOCodeGenerator *CodeGen =
252 InLocalContext ? new LibLTOCodeGenerator(make_unique<LLVMContext>())
253 : new LibLTOCodeGenerator();
254 CodeGen->setTargetOptions(Options);
255 return wrap(CodeGen);
258 lto_code_gen_t lto_codegen_create(void) {
259 return createCodeGen(/* InLocalContext */ false);
262 lto_code_gen_t lto_codegen_create_in_local_context(void) {
263 return createCodeGen(/* InLocalContext */ true);
266 void lto_codegen_dispose(lto_code_gen_t cg) { delete unwrap(cg); }
268 bool lto_codegen_add_module(lto_code_gen_t cg, lto_module_t mod) {
269 return !unwrap(cg)->addModule(unwrap(mod));
272 void lto_codegen_set_module(lto_code_gen_t cg, lto_module_t mod) {
273 unwrap(cg)->setModule(std::unique_ptr<LTOModule>(unwrap(mod)));
276 bool lto_codegen_set_debug_model(lto_code_gen_t cg, lto_debug_model debug) {
277 unwrap(cg)->setDebugInfo(debug);
281 bool lto_codegen_set_pic_model(lto_code_gen_t cg, lto_codegen_model model) {
283 case LTO_CODEGEN_PIC_MODEL_STATIC:
284 unwrap(cg)->setCodePICModel(Reloc::Static);
286 case LTO_CODEGEN_PIC_MODEL_DYNAMIC:
287 unwrap(cg)->setCodePICModel(Reloc::PIC_);
289 case LTO_CODEGEN_PIC_MODEL_DYNAMIC_NO_PIC:
290 unwrap(cg)->setCodePICModel(Reloc::DynamicNoPIC);
292 case LTO_CODEGEN_PIC_MODEL_DEFAULT:
293 unwrap(cg)->setCodePICModel(Reloc::Default);
296 sLastErrorString = "Unknown PIC model";
300 void lto_codegen_set_cpu(lto_code_gen_t cg, const char *cpu) {
301 return unwrap(cg)->setCpu(cpu);
304 void lto_codegen_set_assembler_path(lto_code_gen_t cg, const char *path) {
305 // In here only for backwards compatibility. We use MC now.
308 void lto_codegen_set_assembler_args(lto_code_gen_t cg, const char **args,
310 // In here only for backwards compatibility. We use MC now.
313 void lto_codegen_add_must_preserve_symbol(lto_code_gen_t cg,
314 const char *symbol) {
315 unwrap(cg)->addMustPreserveSymbol(symbol);
318 static void maybeParseOptions(lto_code_gen_t cg) {
319 if (!parsedOptions) {
320 unwrap(cg)->parseCodeGenDebugOptions();
322 parsedOptions = true;
326 bool lto_codegen_write_merged_modules(lto_code_gen_t cg, const char *path) {
327 maybeParseOptions(cg);
328 return !unwrap(cg)->writeMergedModules(path, sLastErrorString);
331 const void *lto_codegen_compile(lto_code_gen_t cg, size_t *length) {
332 maybeParseOptions(cg);
333 LibLTOCodeGenerator *CG = unwrap(cg);
334 CG->NativeObjectFile =
335 CG->compile(DisableVerify, DisableInline, DisableGVNLoadPRE,
336 DisableLTOVectorization, sLastErrorString);
337 if (!CG->NativeObjectFile)
339 *length = CG->NativeObjectFile->getBufferSize();
340 return CG->NativeObjectFile->getBufferStart();
343 bool lto_codegen_optimize(lto_code_gen_t cg) {
344 maybeParseOptions(cg);
345 return !unwrap(cg)->optimize(DisableVerify, DisableInline, DisableGVNLoadPRE,
346 DisableLTOVectorization, sLastErrorString);
349 const void *lto_codegen_compile_optimized(lto_code_gen_t cg, size_t *length) {
350 maybeParseOptions(cg);
351 LibLTOCodeGenerator *CG = unwrap(cg);
352 CG->NativeObjectFile = CG->compileOptimized(sLastErrorString);
353 if (!CG->NativeObjectFile)
355 *length = CG->NativeObjectFile->getBufferSize();
356 return CG->NativeObjectFile->getBufferStart();
359 bool lto_codegen_compile_to_file(lto_code_gen_t cg, const char **name) {
360 maybeParseOptions(cg);
361 return !unwrap(cg)->compile_to_file(
362 name, DisableVerify, DisableInline, DisableGVNLoadPRE,
363 DisableLTOVectorization, sLastErrorString);
366 void lto_codegen_debug_options(lto_code_gen_t cg, const char *opt) {
367 unwrap(cg)->setCodeGenDebugOptions(opt);
370 unsigned int lto_api_version() { return LTO_API_VERSION; }
372 void lto_codegen_set_should_internalize(lto_code_gen_t cg,
373 bool ShouldInternalize) {
374 unwrap(cg)->setShouldInternalize(ShouldInternalize);
377 void lto_codegen_set_should_embed_uselists(lto_code_gen_t cg,
378 lto_bool_t ShouldEmbedUselists) {
379 unwrap(cg)->setShouldEmbedUselists(ShouldEmbedUselists);