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 static void handleLibLTODiagnostic(lto_codegen_diagnostic_severity_t Severity,
89 const char *Msg, void *) {
90 sLastErrorString = Msg;
91 sLastErrorString += "\n";
94 // This derived class owns the native object file. This helps implement the
95 // libLTO API semantics, which require that the code generator owns the object
97 struct LibLTOCodeGenerator : LTOCodeGenerator {
98 LibLTOCodeGenerator() : LTOCodeGenerator(getGlobalContext()) {
99 setDiagnosticHandler(handleLibLTODiagnostic, nullptr); }
100 LibLTOCodeGenerator(std::unique_ptr<LLVMContext> Context)
101 : LTOCodeGenerator(*Context), OwnedContext(std::move(Context)) {
102 setDiagnosticHandler(handleLibLTODiagnostic, nullptr); }
104 std::unique_ptr<MemoryBuffer> NativeObjectFile;
105 std::unique_ptr<LLVMContext> OwnedContext;
110 DEFINE_SIMPLE_CONVERSION_FUNCTIONS(LibLTOCodeGenerator, lto_code_gen_t)
111 DEFINE_SIMPLE_CONVERSION_FUNCTIONS(LTOModule, lto_module_t)
113 // Convert the subtarget features into a string to pass to LTOCodeGenerator.
114 static void lto_add_attrs(lto_code_gen_t cg) {
115 LTOCodeGenerator *CG = unwrap(cg);
118 for (unsigned i = 0; i < MAttrs.size(); ++i) {
121 attrs.append(MAttrs[i]);
124 CG->setAttr(attrs.c_str());
127 if (OptLevel < '0' || OptLevel > '3')
128 report_fatal_error("Optimization level must be between 0 and 3");
129 CG->setOptLevel(OptLevel - '0');
132 extern const char* lto_get_version() {
133 return LTOCodeGenerator::getVersionString();
136 const char* lto_get_error_message() {
137 return sLastErrorString.c_str();
140 bool lto_module_is_object_file(const char* path) {
141 return LTOModule::isBitcodeFile(path);
144 bool lto_module_is_object_file_for_target(const char* path,
145 const char* target_triplet_prefix) {
146 ErrorOr<std::unique_ptr<MemoryBuffer>> Buffer = MemoryBuffer::getFile(path);
149 return LTOModule::isBitcodeForTarget(Buffer->get(), target_triplet_prefix);
152 bool lto_module_is_object_file_in_memory(const void* mem, size_t length) {
153 return LTOModule::isBitcodeFile(mem, length);
157 lto_module_is_object_file_in_memory_for_target(const void* mem,
159 const char* target_triplet_prefix) {
160 std::unique_ptr<MemoryBuffer> buffer(LTOModule::makeBuffer(mem, length));
163 return LTOModule::isBitcodeForTarget(buffer.get(), target_triplet_prefix);
166 lto_module_t lto_module_create(const char* path) {
168 llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
169 return wrap(LTOModule::createFromFile(path, Options, sLastErrorString));
172 lto_module_t lto_module_create_from_fd(int fd, const char *path, size_t size) {
174 llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
176 LTOModule::createFromOpenFile(fd, path, size, Options, sLastErrorString));
179 lto_module_t lto_module_create_from_fd_at_offset(int fd, const char *path,
184 llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
185 return wrap(LTOModule::createFromOpenFileSlice(fd, path, map_size, offset,
186 Options, sLastErrorString));
189 lto_module_t lto_module_create_from_memory(const void* mem, size_t length) {
191 llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
192 return wrap(LTOModule::createFromBuffer(mem, length, Options, sLastErrorString));
195 lto_module_t lto_module_create_from_memory_with_path(const void* mem,
199 llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
201 LTOModule::createFromBuffer(mem, length, Options, sLastErrorString, path));
204 lto_module_t lto_module_create_in_local_context(const void *mem, size_t length,
207 llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
208 return wrap(LTOModule::createInLocalContext(mem, length, Options,
209 sLastErrorString, path));
212 lto_module_t lto_module_create_in_codegen_context(const void *mem,
217 llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
218 return wrap(LTOModule::createInContext(mem, length, Options, sLastErrorString,
219 path, &unwrap(cg)->getContext()));
222 void lto_module_dispose(lto_module_t mod) { delete unwrap(mod); }
224 const char* lto_module_get_target_triple(lto_module_t mod) {
225 return unwrap(mod)->getTargetTriple().c_str();
228 void lto_module_set_target_triple(lto_module_t mod, const char *triple) {
229 return unwrap(mod)->setTargetTriple(triple);
232 unsigned int lto_module_get_num_symbols(lto_module_t mod) {
233 return unwrap(mod)->getSymbolCount();
236 const char* lto_module_get_symbol_name(lto_module_t mod, unsigned int index) {
237 return unwrap(mod)->getSymbolName(index);
240 lto_symbol_attributes lto_module_get_symbol_attribute(lto_module_t mod,
241 unsigned int index) {
242 return unwrap(mod)->getSymbolAttributes(index);
245 const char* lto_module_get_linkeropts(lto_module_t mod) {
246 return unwrap(mod)->getLinkerOpts();
249 void lto_codegen_set_diagnostic_handler(lto_code_gen_t cg,
250 lto_diagnostic_handler_t diag_handler,
252 unwrap(cg)->setDiagnosticHandler(diag_handler, ctxt);
255 static lto_code_gen_t createCodeGen(bool InLocalContext) {
258 TargetOptions Options = InitTargetOptionsFromCodeGenFlags();
260 LibLTOCodeGenerator *CodeGen =
261 InLocalContext ? new LibLTOCodeGenerator(make_unique<LLVMContext>())
262 : new LibLTOCodeGenerator();
263 CodeGen->setTargetOptions(Options);
264 return wrap(CodeGen);
267 lto_code_gen_t lto_codegen_create(void) {
268 return createCodeGen(/* InLocalContext */ false);
271 lto_code_gen_t lto_codegen_create_in_local_context(void) {
272 return createCodeGen(/* InLocalContext */ true);
275 void lto_codegen_dispose(lto_code_gen_t cg) { delete unwrap(cg); }
277 bool lto_codegen_add_module(lto_code_gen_t cg, lto_module_t mod) {
278 return !unwrap(cg)->addModule(unwrap(mod));
281 void lto_codegen_set_module(lto_code_gen_t cg, lto_module_t mod) {
282 unwrap(cg)->setModule(std::unique_ptr<LTOModule>(unwrap(mod)));
285 bool lto_codegen_set_debug_model(lto_code_gen_t cg, lto_debug_model debug) {
286 unwrap(cg)->setDebugInfo(debug);
290 bool lto_codegen_set_pic_model(lto_code_gen_t cg, lto_codegen_model model) {
292 case LTO_CODEGEN_PIC_MODEL_STATIC:
293 unwrap(cg)->setCodePICModel(Reloc::Static);
295 case LTO_CODEGEN_PIC_MODEL_DYNAMIC:
296 unwrap(cg)->setCodePICModel(Reloc::PIC_);
298 case LTO_CODEGEN_PIC_MODEL_DYNAMIC_NO_PIC:
299 unwrap(cg)->setCodePICModel(Reloc::DynamicNoPIC);
301 case LTO_CODEGEN_PIC_MODEL_DEFAULT:
302 unwrap(cg)->setCodePICModel(Reloc::Default);
305 sLastErrorString = "Unknown PIC model";
309 void lto_codegen_set_cpu(lto_code_gen_t cg, const char *cpu) {
310 return unwrap(cg)->setCpu(cpu);
313 void lto_codegen_set_assembler_path(lto_code_gen_t cg, const char *path) {
314 // In here only for backwards compatibility. We use MC now.
317 void lto_codegen_set_assembler_args(lto_code_gen_t cg, const char **args,
319 // In here only for backwards compatibility. We use MC now.
322 void lto_codegen_add_must_preserve_symbol(lto_code_gen_t cg,
323 const char *symbol) {
324 unwrap(cg)->addMustPreserveSymbol(symbol);
327 static void maybeParseOptions(lto_code_gen_t cg) {
328 if (!parsedOptions) {
329 unwrap(cg)->parseCodeGenDebugOptions();
331 parsedOptions = true;
335 bool lto_codegen_write_merged_modules(lto_code_gen_t cg, const char *path) {
336 maybeParseOptions(cg);
337 return !unwrap(cg)->writeMergedModules(path);
340 const void *lto_codegen_compile(lto_code_gen_t cg, size_t *length) {
341 maybeParseOptions(cg);
342 LibLTOCodeGenerator *CG = unwrap(cg);
343 CG->NativeObjectFile =
344 CG->compile(DisableVerify, DisableInline, DisableGVNLoadPRE,
345 DisableLTOVectorization);
346 if (!CG->NativeObjectFile)
348 *length = CG->NativeObjectFile->getBufferSize();
349 return CG->NativeObjectFile->getBufferStart();
352 bool lto_codegen_optimize(lto_code_gen_t cg) {
353 maybeParseOptions(cg);
354 return !unwrap(cg)->optimize(DisableVerify, DisableInline, DisableGVNLoadPRE,
355 DisableLTOVectorization);
358 const void *lto_codegen_compile_optimized(lto_code_gen_t cg, size_t *length) {
359 maybeParseOptions(cg);
360 LibLTOCodeGenerator *CG = unwrap(cg);
361 CG->NativeObjectFile = CG->compileOptimized();
362 if (!CG->NativeObjectFile)
364 *length = CG->NativeObjectFile->getBufferSize();
365 return CG->NativeObjectFile->getBufferStart();
368 bool lto_codegen_compile_to_file(lto_code_gen_t cg, const char **name) {
369 maybeParseOptions(cg);
370 return !unwrap(cg)->compile_to_file(
371 name, DisableVerify, DisableInline, DisableGVNLoadPRE,
372 DisableLTOVectorization);
375 void lto_codegen_debug_options(lto_code_gen_t cg, const char *opt) {
376 unwrap(cg)->setCodeGenDebugOptions(opt);
379 unsigned int lto_api_version() { return LTO_API_VERSION; }
381 void lto_codegen_set_should_internalize(lto_code_gen_t cg,
382 bool ShouldInternalize) {
383 unwrap(cg)->setShouldInternalize(ShouldInternalize);
386 void lto_codegen_set_should_embed_uselists(lto_code_gen_t cg,
387 lto_bool_t ShouldEmbedUselists) {
388 unwrap(cg)->setShouldEmbedUselists(ShouldEmbedUselists);