1 //===-lto.cpp - LLVM Link Time Optimizer ----------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 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. 12 // 13 //===----------------------------------------------------------------------===// 14 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" 24 25 // extra command-line flags needed for LTOCodeGenerator 26 static cl::opt<char> 27 OptLevel("O", 28 cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] " 29 "(default = '-O2')"), 30 cl::Prefix, 31 cl::ZeroOrMore, 32 cl::init('2')); 33 34 static cl::opt<bool> 35 DisableInline("disable-inlining", cl::init(false), 36 cl::desc("Do not run the inliner pass")); 37 38 static cl::opt<bool> 39 DisableGVNLoadPRE("disable-gvn-loadpre", cl::init(false), 40 cl::desc("Do not run the GVN load PRE pass")); 41 42 static cl::opt<bool> 43 DisableLTOVectorization("disable-lto-vectorization", cl::init(false), 44 cl::desc("Do not run loop or slp vectorization during LTO")); 45 46 // Holds most recent error string. 47 // *** Not thread safe *** 48 static std::string sLastErrorString; 49 50 // Holds the initialization state of the LTO module. 51 // *** Not thread safe *** 52 static bool initialized = false; 53 54 // Holds the command-line option parsing state of the LTO module. 55 static bool parsedOptions = false; 56 57 // Initialize the configured targets if they have not been initialized. 58 static void lto_initialize() { 59 if (!initialized) { 60 #ifdef LLVM_ON_WIN32 61 // Dialog box on crash disabling doesn't work across DLL boundaries, so do 62 // it here. 63 llvm::sys::DisableSystemDialogsOnCrash(); 64 #endif 65 66 InitializeAllTargetInfos(); 67 InitializeAllTargets(); 68 InitializeAllTargetMCs(); 69 InitializeAllAsmParsers(); 70 InitializeAllAsmPrinters(); 71 InitializeAllDisassemblers(); 72 initialized = true; 73 } 74 } 75 76 DEFINE_SIMPLE_CONVERSION_FUNCTIONS(LTOCodeGenerator, lto_code_gen_t) 77 DEFINE_SIMPLE_CONVERSION_FUNCTIONS(LTOModule, lto_module_t) 78 79 // Convert the subtarget features into a string to pass to LTOCodeGenerator. 80 static void lto_add_attrs(lto_code_gen_t cg) { 81 LTOCodeGenerator *CG = unwrap(cg); 82 if (MAttrs.size()) { 83 std::string attrs; 84 for (unsigned i = 0; i < MAttrs.size(); ++i) { 85 if (i > 0) 86 attrs.append(","); 87 attrs.append(MAttrs[i]); 88 } 89 90 CG->setAttr(attrs.c_str()); 91 } 92 93 if (OptLevel < '0' || OptLevel > '3') 94 report_fatal_error("Optimization level must be between 0 and 3"); 95 CG->setOptLevel(OptLevel - '0'); 96 } 97 98 extern const char* lto_get_version() { 99 return LTOCodeGenerator::getVersionString(); 100 } 101 102 const char* lto_get_error_message() { 103 return sLastErrorString.c_str(); 104 } 105 106 bool lto_module_is_object_file(const char* path) { 107 return LTOModule::isBitcodeFile(path); 108 } 109 110 bool lto_module_is_object_file_for_target(const char* path, 111 const char* target_triplet_prefix) { 112 ErrorOr<std::unique_ptr<MemoryBuffer>> Buffer = MemoryBuffer::getFile(path); 113 if (!Buffer) 114 return false; 115 return LTOModule::isBitcodeForTarget(Buffer->get(), target_triplet_prefix); 116 } 117 118 bool lto_module_is_object_file_in_memory(const void* mem, size_t length) { 119 return LTOModule::isBitcodeFile(mem, length); 120 } 121 122 bool 123 lto_module_is_object_file_in_memory_for_target(const void* mem, 124 size_t length, 125 const char* target_triplet_prefix) { 126 std::unique_ptr<MemoryBuffer> buffer(LTOModule::makeBuffer(mem, length)); 127 if (!buffer) 128 return false; 129 return LTOModule::isBitcodeForTarget(buffer.get(), target_triplet_prefix); 130 } 131 132 lto_module_t lto_module_create(const char* path) { 133 lto_initialize(); 134 llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags(); 135 return wrap(LTOModule::createFromFile(path, Options, sLastErrorString)); 136 } 137 138 lto_module_t lto_module_create_from_fd(int fd, const char *path, size_t size) { 139 lto_initialize(); 140 llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags(); 141 return wrap( 142 LTOModule::createFromOpenFile(fd, path, size, Options, sLastErrorString)); 143 } 144 145 lto_module_t lto_module_create_from_fd_at_offset(int fd, const char *path, 146 size_t file_size, 147 size_t map_size, 148 off_t offset) { 149 lto_initialize(); 150 llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags(); 151 return wrap(LTOModule::createFromOpenFileSlice(fd, path, map_size, offset, 152 Options, sLastErrorString)); 153 } 154 155 lto_module_t lto_module_create_from_memory(const void* mem, size_t length) { 156 lto_initialize(); 157 llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags(); 158 return wrap(LTOModule::createFromBuffer(mem, length, Options, sLastErrorString)); 159 } 160 161 lto_module_t lto_module_create_from_memory_with_path(const void* mem, 162 size_t length, 163 const char *path) { 164 lto_initialize(); 165 llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags(); 166 return wrap( 167 LTOModule::createFromBuffer(mem, length, Options, sLastErrorString, path)); 168 } 169 170 lto_module_t lto_module_create_in_local_context(const void *mem, size_t length, 171 const char *path) { 172 lto_initialize(); 173 llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags(); 174 return wrap(LTOModule::createInLocalContext(mem, length, Options, 175 sLastErrorString, path)); 176 } 177 178 lto_module_t lto_module_create_in_codegen_context(const void *mem, 179 size_t length, 180 const char *path, 181 lto_code_gen_t cg) { 182 lto_initialize(); 183 llvm::TargetOptions Options = InitTargetOptionsFromCodeGenFlags(); 184 return wrap(LTOModule::createInContext(mem, length, Options, sLastErrorString, 185 path, &unwrap(cg)->getContext())); 186 } 187 188 void lto_module_dispose(lto_module_t mod) { delete unwrap(mod); } 189 190 const char* lto_module_get_target_triple(lto_module_t mod) { 191 return unwrap(mod)->getTargetTriple().c_str(); 192 } 193 194 void lto_module_set_target_triple(lto_module_t mod, const char *triple) { 195 return unwrap(mod)->setTargetTriple(triple); 196 } 197 198 unsigned int lto_module_get_num_symbols(lto_module_t mod) { 199 return unwrap(mod)->getSymbolCount(); 200 } 201 202 const char* lto_module_get_symbol_name(lto_module_t mod, unsigned int index) { 203 return unwrap(mod)->getSymbolName(index); 204 } 205 206 lto_symbol_attributes lto_module_get_symbol_attribute(lto_module_t mod, 207 unsigned int index) { 208 return unwrap(mod)->getSymbolAttributes(index); 209 } 210 211 unsigned int lto_module_get_num_deplibs(lto_module_t mod) { 212 return unwrap(mod)->getDependentLibraryCount(); 213 } 214 215 const char* lto_module_get_deplib(lto_module_t mod, unsigned int index) { 216 return unwrap(mod)->getDependentLibrary(index); 217 } 218 219 unsigned int lto_module_get_num_linkeropts(lto_module_t mod) { 220 return unwrap(mod)->getLinkerOptCount(); 221 } 222 223 const char* lto_module_get_linkeropt(lto_module_t mod, unsigned int index) { 224 return unwrap(mod)->getLinkerOpt(index); 225 } 226 227 void lto_codegen_set_diagnostic_handler(lto_code_gen_t cg, 228 lto_diagnostic_handler_t diag_handler, 229 void *ctxt) { 230 unwrap(cg)->setDiagnosticHandler(diag_handler, ctxt); 231 } 232 233 static lto_code_gen_t createCodeGen(bool InLocalContext) { 234 lto_initialize(); 235 236 TargetOptions Options = InitTargetOptionsFromCodeGenFlags(); 237 238 LTOCodeGenerator *CodeGen = 239 InLocalContext ? new LTOCodeGenerator(make_unique<LLVMContext>()) 240 : new LTOCodeGenerator(); 241 if (CodeGen) 242 CodeGen->setTargetOptions(Options); 243 return wrap(CodeGen); 244 } 245 246 lto_code_gen_t lto_codegen_create(void) { 247 return createCodeGen(/* InLocalContext */ false); 248 } 249 250 lto_code_gen_t lto_codegen_create_in_local_context(void) { 251 return createCodeGen(/* InLocalContext */ true); 252 } 253 254 void lto_codegen_dispose(lto_code_gen_t cg) { delete unwrap(cg); } 255 256 bool lto_codegen_add_module(lto_code_gen_t cg, lto_module_t mod) { 257 return !unwrap(cg)->addModule(unwrap(mod)); 258 } 259 260 void lto_codegen_set_module(lto_code_gen_t cg, lto_module_t mod) { 261 unwrap(cg)->setModule(unwrap(mod)); 262 } 263 264 bool lto_codegen_set_debug_model(lto_code_gen_t cg, lto_debug_model debug) { 265 unwrap(cg)->setDebugInfo(debug); 266 return false; 267 } 268 269 bool lto_codegen_set_pic_model(lto_code_gen_t cg, lto_codegen_model model) { 270 unwrap(cg)->setCodePICModel(model); 271 return false; 272 } 273 274 void lto_codegen_set_cpu(lto_code_gen_t cg, const char *cpu) { 275 return unwrap(cg)->setCpu(cpu); 276 } 277 278 void lto_codegen_set_assembler_path(lto_code_gen_t cg, const char *path) { 279 // In here only for backwards compatibility. We use MC now. 280 } 281 282 void lto_codegen_set_assembler_args(lto_code_gen_t cg, const char **args, 283 int nargs) { 284 // In here only for backwards compatibility. We use MC now. 285 } 286 287 void lto_codegen_add_must_preserve_symbol(lto_code_gen_t cg, 288 const char *symbol) { 289 unwrap(cg)->addMustPreserveSymbol(symbol); 290 } 291 292 static void maybeParseOptions(lto_code_gen_t cg) { 293 if (!parsedOptions) { 294 unwrap(cg)->parseCodeGenDebugOptions(); 295 lto_add_attrs(cg); 296 parsedOptions = true; 297 } 298 } 299 300 bool lto_codegen_write_merged_modules(lto_code_gen_t cg, const char *path) { 301 maybeParseOptions(cg); 302 return !unwrap(cg)->writeMergedModules(path, sLastErrorString); 303 } 304 305 const void *lto_codegen_compile(lto_code_gen_t cg, size_t *length) { 306 maybeParseOptions(cg); 307 return unwrap(cg)->compile(length, DisableInline, 308 DisableGVNLoadPRE, DisableLTOVectorization, 309 sLastErrorString); 310 } 311 312 bool lto_codegen_optimize(lto_code_gen_t cg) { 313 maybeParseOptions(cg); 314 return !unwrap(cg)->optimize(DisableInline, 315 DisableGVNLoadPRE, DisableLTOVectorization, 316 sLastErrorString); 317 } 318 319 const void *lto_codegen_compile_optimized(lto_code_gen_t cg, size_t *length) { 320 maybeParseOptions(cg); 321 return unwrap(cg)->compileOptimized(length, sLastErrorString); 322 } 323 324 bool lto_codegen_compile_to_file(lto_code_gen_t cg, const char **name) { 325 maybeParseOptions(cg); 326 return !unwrap(cg)->compile_to_file( 327 name, DisableInline, DisableGVNLoadPRE, 328 DisableLTOVectorization, sLastErrorString); 329 } 330 331 void lto_codegen_debug_options(lto_code_gen_t cg, const char *opt) { 332 unwrap(cg)->setCodeGenDebugOptions(opt); 333 } 334 335 unsigned int lto_api_version() { return LTO_API_VERSION; } 336