llvm/tools/lto/lto.cpp

   1 //===-lto.cpp - LLVM Link Time Optimizer ----------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This file implements the Link Time Optimization library. This library is
  10 // intended to be used by linker to optimize code at link time.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm-c/lto.h"
  15 #include "llvm/ADT/STLExtras.h"
  16 #include "llvm/ADT/StringExtras.h"
  17 #include "llvm/Bitcode/BitcodeReader.h"
  18 #include "llvm/CodeGen/CommandFlags.h"
  19 #include "llvm/IR/DiagnosticInfo.h"
  20 #include "llvm/IR/DiagnosticPrinter.h"
  21 #include "llvm/IR/LLVMContext.h"
  22 #include "llvm/LTO/LTO.h"
  23 #include "llvm/LTO/legacy/LTOCodeGenerator.h"
  24 #include "llvm/LTO/legacy/LTOModule.h"
  25 #include "llvm/LTO/legacy/ThinLTOCodeGenerator.h"
  26 #include "llvm/Support/MemoryBuffer.h"
  27 #include "llvm/Support/Signals.h"
  28 #include "llvm/Support/TargetSelect.h"
  29 #include "llvm/Support/raw_ostream.h"
  30
  31 using namespace llvm;
  32
  33 static codegen::RegisterCodeGenFlags CGF;
  34
  35 // extra command-line flags needed for LTOCodeGenerator
  36 static cl::opt<char>
  37 OptLevel("O",
  38          cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] "
  39                   "(default = '-O2')"),
  40          cl::Prefix,
  41          cl::ZeroOrMore,
  42          cl::init('2'));
  43
  44 static cl::opt<bool> EnableFreestanding(
  45     "lto-freestanding", cl::init(false),
  46     cl::desc("Enable Freestanding (disable builtins / TLI) during LTO"));
  47
  48 #ifdef NDEBUG
  49 static bool VerifyByDefault = false;
  50 #else
  51 static bool VerifyByDefault = true;
  52 #endif
  53
  54 static cl::opt<bool> DisableVerify(
  55     "disable-llvm-verifier", cl::init(!VerifyByDefault),
  56     cl::desc("Don't run the LLVM verifier during the optimization pipeline"));
  57
  58 // Holds most recent error string.
  59 // *** Not thread safe ***
  60 static std::string sLastErrorString;
  61
  62 // Holds the initialization state of the LTO module.
  63 // *** Not thread safe ***
  64 static bool initialized = false;
  65
  66 // Represent the state of parsing command line debug options.
  67 static enum class OptParsingState {
  68   NotParsed, // Initial state.
  69   Early,     // After lto_set_debug_options is called.
  70   Done       // After maybeParseOptions is called.
  71 } optionParsingState = OptParsingState::NotParsed;
  72
  73 static LLVMContext *LTOContext = nullptr;
  74
  75 struct LTOToolDiagnosticHandler : public DiagnosticHandler {
  76   bool handleDiagnostics(const DiagnosticInfo &DI) override {
  77     if (DI.getSeverity() != DS_Error) {
  78       DiagnosticPrinterRawOStream DP(errs());
  79       DI.print(DP);
  80       errs() << '\n';
  81       return true;
  82     }
  83     sLastErrorString = "";
  84     {
  85       raw_string_ostream Stream(sLastErrorString);
  86       DiagnosticPrinterRawOStream DP(Stream);
  87       DI.print(DP);
  88     }
  89     return true;
  90   }
  91 };
  92
  93 // Initialize the configured targets if they have not been initialized.
  94 static void lto_initialize() {
  95   if (!initialized) {
  96 #ifdef _WIN32
  97     // Dialog box on crash disabling doesn't work across DLL boundaries, so do
  98     // it here.
  99     llvm::sys::DisableSystemDialogsOnCrash();
 100 #endif
 101
 102     InitializeAllTargetInfos();
 103     InitializeAllTargets();
 104     InitializeAllTargetMCs();
 105     InitializeAllAsmParsers();
 106     InitializeAllAsmPrinters();
 107     InitializeAllDisassemblers();
 108
 109     static LLVMContext Context;
 110     LTOContext = &Context;
 111     LTOContext->setDiagnosticHandler(
 112         std::make_unique<LTOToolDiagnosticHandler>(), true);
 113     initialized = true;
 114   }
 115 }
 116
 117 namespace {
 118
 119 static void handleLibLTODiagnostic(lto_codegen_diagnostic_severity_t Severity,
 120                                    const char *Msg, void *) {
 121   sLastErrorString = Msg;
 122 }
 123
 124 // This derived class owns the native object file. This helps implement the
 125 // libLTO API semantics, which require that the code generator owns the object
 126 // file.
 127 struct LibLTOCodeGenerator : LTOCodeGenerator {
 128   LibLTOCodeGenerator() : LTOCodeGenerator(*LTOContext) { init(); }
 129   LibLTOCodeGenerator(std::unique_ptr<LLVMContext> Context)
 130       : LTOCodeGenerator(*Context), OwnedContext(std::move(Context)) {
 131     init();
 132   }
 133
 134   // Reset the module first in case MergedModule is created in OwnedContext.
 135   // Module must be destructed before its context gets destructed.
 136   ~LibLTOCodeGenerator() { resetMergedModule(); }
 137
 138   void init() { setDiagnosticHandler(handleLibLTODiagnostic, nullptr); }
 139
 140   std::unique_ptr<MemoryBuffer> NativeObjectFile;
 141   std::unique_ptr<LLVMContext> OwnedContext;
 142 };
 143
 144 }
 145
 146 DEFINE_SIMPLE_CONVERSION_FUNCTIONS(LibLTOCodeGenerator, lto_code_gen_t)
 147 DEFINE_SIMPLE_CONVERSION_FUNCTIONS(ThinLTOCodeGenerator, thinlto_code_gen_t)
 148 DEFINE_SIMPLE_CONVERSION_FUNCTIONS(LTOModule, lto_module_t)
 149
 150 // Convert the subtarget features into a string to pass to LTOCodeGenerator.
 151 static void lto_add_attrs(lto_code_gen_t cg) {
 152   LTOCodeGenerator *CG = unwrap(cg);
 153   CG->setAttrs(codegen::getMAttrs());
 154
 155   if (OptLevel < '0' || OptLevel > '3')
 156     report_fatal_error("Optimization level must be between 0 and 3");
 157   CG->setOptLevel(OptLevel - '0');
 158   CG->setFreestanding(EnableFreestanding);
 159   CG->setDisableVerify(DisableVerify);
 160 }
 161
 162 extern const char* lto_get_version() {
 163   return LTOCodeGenerator::getVersionString();
 164 }
 165
 166 const char* lto_get_error_message() {
 167   return sLastErrorString.c_str();
 168 }
 169
 170 bool lto_module_is_object_file(const char* path) {
 171   return LTOModule::isBitcodeFile(StringRef(path));
 172 }
 173
 174 bool lto_module_is_object_file_for_target(const char* path,
 175                                           const char* target_triplet_prefix) {
 176   ErrorOr<std::unique_ptr<MemoryBuffer>> Buffer = MemoryBuffer::getFile(path);
 177   if (!Buffer)
 178     return false;
 179   return LTOModule::isBitcodeForTarget(Buffer->get(),
 180                                        StringRef(target_triplet_prefix));
 181 }
 182
 183 bool lto_module_has_objc_category(const void *mem, size_t length) {
 184   std::unique_ptr<MemoryBuffer> Buffer(LTOModule::makeBuffer(mem, length));
 185   if (!Buffer)
 186     return false;
 187   LLVMContext Ctx;
 188   ErrorOr<bool> Result = expectedToErrorOrAndEmitErrors(
 189       Ctx, llvm::isBitcodeContainingObjCCategory(*Buffer));
 190   return Result && *Result;
 191 }
 192
 193 bool lto_module_is_object_file_in_memory(const void* mem, size_t length) {
 194   return LTOModule::isBitcodeFile(mem, length);
 195 }
 196
 197 bool
 198 lto_module_is_object_file_in_memory_for_target(const void* mem,
 199                                             size_t length,
 200                                             const char* target_triplet_prefix) {
 201   std::unique_ptr<MemoryBuffer> buffer(LTOModule::makeBuffer(mem, length));
 202   if (!buffer)
 203     return false;
 204   return LTOModule::isBitcodeForTarget(buffer.get(),
 205                                        StringRef(target_triplet_prefix));
 206 }
 207
 208 lto_module_t lto_module_create(const char* path) {
 209   lto_initialize();
 210   llvm::TargetOptions Options =
 211       codegen::InitTargetOptionsFromCodeGenFlags(Triple());
 212   ErrorOr<std::unique_ptr<LTOModule>> M =
 213       LTOModule::createFromFile(*LTOContext, StringRef(path), Options);
 214   if (!M)
 215     return nullptr;
 216   return wrap(M->release());
 217 }
 218
 219 lto_module_t lto_module_create_from_fd(int fd, const char *path, size_t size) {
 220   lto_initialize();
 221   llvm::TargetOptions Options =
 222       codegen::InitTargetOptionsFromCodeGenFlags(Triple());
 223   ErrorOr<std::unique_ptr<LTOModule>> M = LTOModule::createFromOpenFile(
 224       *LTOContext, fd, StringRef(path), size, Options);
 225   if (!M)
 226     return nullptr;
 227   return wrap(M->release());
 228 }
 229
 230 lto_module_t lto_module_create_from_fd_at_offset(int fd, const char *path,
 231                                                  size_t file_size,
 232                                                  size_t map_size,
 233                                                  off_t offset) {
 234   lto_initialize();
 235   llvm::TargetOptions Options =
 236       codegen::InitTargetOptionsFromCodeGenFlags(Triple());
 237   ErrorOr<std::unique_ptr<LTOModule>> M = LTOModule::createFromOpenFileSlice(
 238       *LTOContext, fd, StringRef(path), map_size, offset, Options);
 239   if (!M)
 240     return nullptr;
 241   return wrap(M->release());
 242 }
 243
 244 lto_module_t lto_module_create_from_memory(const void* mem, size_t length) {
 245   lto_initialize();
 246   llvm::TargetOptions Options =
 247       codegen::InitTargetOptionsFromCodeGenFlags(Triple());
 248   ErrorOr<std::unique_ptr<LTOModule>> M =
 249       LTOModule::createFromBuffer(*LTOContext, mem, length, Options);
 250   if (!M)
 251     return nullptr;
 252   return wrap(M->release());
 253 }
 254
 255 lto_module_t lto_module_create_from_memory_with_path(const void* mem,
 256                                                      size_t length,
 257                                                      const char *path) {
 258   lto_initialize();
 259   llvm::TargetOptions Options =
 260       codegen::InitTargetOptionsFromCodeGenFlags(Triple());
 261   ErrorOr<std::unique_ptr<LTOModule>> M = LTOModule::createFromBuffer(
 262       *LTOContext, mem, length, Options, StringRef(path));
 263   if (!M)
 264     return nullptr;
 265   return wrap(M->release());
 266 }
 267
 268 lto_module_t lto_module_create_in_local_context(const void *mem, size_t length,
 269                                                 const char *path) {
 270   lto_initialize();
 271   llvm::TargetOptions Options =
 272       codegen::InitTargetOptionsFromCodeGenFlags(Triple());
 273
 274   // Create a local context. Ownership will be transferred to LTOModule.
 275   std::unique_ptr<LLVMContext> Context = std::make_unique<LLVMContext>();
 276   Context->setDiagnosticHandler(std::make_unique<LTOToolDiagnosticHandler>(),
 277                                 true);
 278
 279   ErrorOr<std::unique_ptr<LTOModule>> M = LTOModule::createInLocalContext(
 280       std::move(Context), mem, length, Options, StringRef(path));
 281   if (!M)
 282     return nullptr;
 283   return wrap(M->release());
 284 }
 285
 286 lto_module_t lto_module_create_in_codegen_context(const void *mem,
 287                                                   size_t length,
 288                                                   const char *path,
 289                                                   lto_code_gen_t cg) {
 290   lto_initialize();
 291   llvm::TargetOptions Options =
 292       codegen::InitTargetOptionsFromCodeGenFlags(Triple());
 293   ErrorOr<std::unique_ptr<LTOModule>> M = LTOModule::createFromBuffer(
 294       unwrap(cg)->getContext(), mem, length, Options, StringRef(path));
 295   return wrap(M->release());
 296 }
 297
 298 void lto_module_dispose(lto_module_t mod) { delete unwrap(mod); }
 299
 300 const char* lto_module_get_target_triple(lto_module_t mod) {
 301   return unwrap(mod)->getTargetTriple().c_str();
 302 }
 303
 304 void lto_module_set_target_triple(lto_module_t mod, const char *triple) {
 305   return unwrap(mod)->setTargetTriple(StringRef(triple));
 306 }
 307
 308 unsigned int lto_module_get_num_symbols(lto_module_t mod) {
 309   return unwrap(mod)->getSymbolCount();
 310 }
 311
 312 const char* lto_module_get_symbol_name(lto_module_t mod, unsigned int index) {
 313   return unwrap(mod)->getSymbolName(index).data();
 314 }
 315
 316 lto_symbol_attributes lto_module_get_symbol_attribute(lto_module_t mod,
 317                                                       unsigned int index) {
 318   return unwrap(mod)->getSymbolAttributes(index);
 319 }
 320
 321 const char* lto_module_get_linkeropts(lto_module_t mod) {
 322   return unwrap(mod)->getLinkerOpts().data();
 323 }
 324
 325 lto_bool_t lto_module_get_macho_cputype(lto_module_t mod,
 326                                         unsigned int *out_cputype,
 327                                         unsigned int *out_cpusubtype) {
 328   LTOModule *M = unwrap(mod);
 329   Expected<uint32_t> CPUType = M->getMachOCPUType();
 330   if (!CPUType) {
 331     sLastErrorString = toString(CPUType.takeError());
 332     return true;
 333   }
 334   *out_cputype = *CPUType;
 335
 336   Expected<uint32_t> CPUSubType = M->getMachOCPUSubType();
 337   if (!CPUSubType) {
 338     sLastErrorString = toString(CPUSubType.takeError());
 339     return true;
 340   }
 341   *out_cpusubtype = *CPUSubType;
 342
 343   return false;
 344 }
 345
 346 void lto_codegen_set_diagnostic_handler(lto_code_gen_t cg,
 347                                         lto_diagnostic_handler_t diag_handler,
 348                                         void *ctxt) {
 349   unwrap(cg)->setDiagnosticHandler(diag_handler, ctxt);
 350 }
 351
 352 static lto_code_gen_t createCodeGen(bool InLocalContext) {
 353   lto_initialize();
 354
 355   TargetOptions Options = codegen::InitTargetOptionsFromCodeGenFlags(Triple());
 356
 357   LibLTOCodeGenerator *CodeGen =
 358       InLocalContext ? new LibLTOCodeGenerator(std::make_unique<LLVMContext>())
 359                      : new LibLTOCodeGenerator();
 360   CodeGen->setTargetOptions(Options);
 361   return wrap(CodeGen);
 362 }
 363
 364 lto_code_gen_t lto_codegen_create(void) {
 365   return createCodeGen(/* InLocalContext */ false);
 366 }
 367
 368 lto_code_gen_t lto_codegen_create_in_local_context(void) {
 369   return createCodeGen(/* InLocalContext */ true);
 370 }
 371
 372 void lto_codegen_dispose(lto_code_gen_t cg) { delete unwrap(cg); }
 373
 374 bool lto_codegen_add_module(lto_code_gen_t cg, lto_module_t mod) {
 375   return !unwrap(cg)->addModule(unwrap(mod));
 376 }
 377
 378 void lto_codegen_set_module(lto_code_gen_t cg, lto_module_t mod) {
 379   unwrap(cg)->setModule(std::unique_ptr<LTOModule>(unwrap(mod)));
 380 }
 381
 382 bool lto_codegen_set_debug_model(lto_code_gen_t cg, lto_debug_model debug) {
 383   unwrap(cg)->setDebugInfo(debug);
 384   return false;
 385 }
 386
 387 bool lto_codegen_set_pic_model(lto_code_gen_t cg, lto_codegen_model model) {
 388   switch (model) {
 389   case LTO_CODEGEN_PIC_MODEL_STATIC:
 390     unwrap(cg)->setCodePICModel(Reloc::Static);
 391     return false;
 392   case LTO_CODEGEN_PIC_MODEL_DYNAMIC:
 393     unwrap(cg)->setCodePICModel(Reloc::PIC_);
 394     return false;
 395   case LTO_CODEGEN_PIC_MODEL_DYNAMIC_NO_PIC:
 396     unwrap(cg)->setCodePICModel(Reloc::DynamicNoPIC);
 397     return false;
 398   case LTO_CODEGEN_PIC_MODEL_DEFAULT:
 399     unwrap(cg)->setCodePICModel(None);
 400     return false;
 401   }
 402   sLastErrorString = "Unknown PIC model";
 403   return true;
 404 }
 405
 406 void lto_codegen_set_cpu(lto_code_gen_t cg, const char *cpu) {
 407   return unwrap(cg)->setCpu(cpu);
 408 }
 409
 410 void lto_codegen_set_assembler_path(lto_code_gen_t cg, const char *path) {
 411   // In here only for backwards compatibility. We use MC now.
 412 }
 413
 414 void lto_codegen_set_assembler_args(lto_code_gen_t cg, const char **args,
 415                                     int nargs) {
 416   // In here only for backwards compatibility. We use MC now.
 417 }
 418
 419 void lto_codegen_add_must_preserve_symbol(lto_code_gen_t cg,
 420                                           const char *symbol) {
 421   unwrap(cg)->addMustPreserveSymbol(symbol);
 422 }
 423
 424 static void maybeParseOptions(lto_code_gen_t cg) {
 425   if (optionParsingState != OptParsingState::Done) {
 426     // Parse options if any were set by the lto_codegen_debug_options* function.
 427     unwrap(cg)->parseCodeGenDebugOptions();
 428     lto_add_attrs(cg);
 429     optionParsingState = OptParsingState::Done;
 430   }
 431 }
 432
 433 bool lto_codegen_write_merged_modules(lto_code_gen_t cg, const char *path) {
 434   maybeParseOptions(cg);
 435   return !unwrap(cg)->writeMergedModules(path);
 436 }
 437
 438 const void *lto_codegen_compile(lto_code_gen_t cg, size_t *length) {
 439   maybeParseOptions(cg);
 440   LibLTOCodeGenerator *CG = unwrap(cg);
 441   CG->NativeObjectFile = CG->compile();
 442   if (!CG->NativeObjectFile)
 443     return nullptr;
 444   *length = CG->NativeObjectFile->getBufferSize();
 445   return CG->NativeObjectFile->getBufferStart();
 446 }
 447
 448 bool lto_codegen_optimize(lto_code_gen_t cg) {
 449   maybeParseOptions(cg);
 450   return !unwrap(cg)->optimize();
 451 }
 452
 453 const void *lto_codegen_compile_optimized(lto_code_gen_t cg, size_t *length) {
 454   maybeParseOptions(cg);
 455   LibLTOCodeGenerator *CG = unwrap(cg);
 456   CG->NativeObjectFile = CG->compileOptimized();
 457   if (!CG->NativeObjectFile)
 458     return nullptr;
 459   *length = CG->NativeObjectFile->getBufferSize();
 460   return CG->NativeObjectFile->getBufferStart();
 461 }
 462
 463 bool lto_codegen_compile_to_file(lto_code_gen_t cg, const char **name) {
 464   maybeParseOptions(cg);
 465   return !unwrap(cg)->compile_to_file(name);
 466 }
 467
 468 void lto_set_debug_options(const char *const *options, int number) {
 469   assert(optionParsingState == OptParsingState::NotParsed &&
 470          "option processing already happened");
 471   // Need to put each suboption in a null-terminated string before passing to
 472   // parseCommandLineOptions().
 473   std::vector<std::string> Options;
 474   for (int i = 0; i < number; ++i)
 475     Options.push_back(options[i]);
 476
 477   llvm::parseCommandLineOptions(Options);
 478   optionParsingState = OptParsingState::Early;
 479 }
 480
 481 void lto_codegen_debug_options(lto_code_gen_t cg, const char *opt) {
 482   assert(optionParsingState != OptParsingState::Early &&
 483          "early option processing already happened");
 484   SmallVector<StringRef, 4> Options;
 485   for (std::pair<StringRef, StringRef> o = getToken(opt); !o.first.empty();
 486        o = getToken(o.second))
 487     Options.push_back(o.first);
 488
 489   unwrap(cg)->setCodeGenDebugOptions(Options);
 490 }
 491
 492 void lto_codegen_debug_options_array(lto_code_gen_t cg,
 493                                      const char *const *options, int number) {
 494   assert(optionParsingState != OptParsingState::Early &&
 495          "early option processing already happened");
 496   SmallVector<StringRef, 4> Options;
 497   for (int i = 0; i < number; ++i)
 498     Options.push_back(options[i]);
 499   unwrap(cg)->setCodeGenDebugOptions(makeArrayRef(Options));
 500 }
 501
 502 unsigned int lto_api_version() { return LTO_API_VERSION; }
 503
 504 void lto_codegen_set_should_internalize(lto_code_gen_t cg,
 505                                         bool ShouldInternalize) {
 506   unwrap(cg)->setShouldInternalize(ShouldInternalize);
 507 }
 508
 509 void lto_codegen_set_should_embed_uselists(lto_code_gen_t cg,
 510                                            lto_bool_t ShouldEmbedUselists) {
 511   unwrap(cg)->setShouldEmbedUselists(ShouldEmbedUselists);
 512 }
 513
 514 lto_bool_t lto_module_has_ctor_dtor(lto_module_t mod) {
 515   return unwrap(mod)->hasCtorDtor();
 516 }
 517
 518 // ThinLTO API below
 519
 520 thinlto_code_gen_t thinlto_create_codegen(void) {
 521   lto_initialize();
 522   ThinLTOCodeGenerator *CodeGen = new ThinLTOCodeGenerator();
 523   CodeGen->setTargetOptions(
 524       codegen::InitTargetOptionsFromCodeGenFlags(Triple()));
 525   CodeGen->setFreestanding(EnableFreestanding);
 526
 527   if (OptLevel.getNumOccurrences()) {
 528     if (OptLevel < '0' || OptLevel > '3')
 529       report_fatal_error("Optimization level must be between 0 and 3");
 530     CodeGen->setOptLevel(OptLevel - '0');
 531     switch (OptLevel) {
 532     case '0':
 533       CodeGen->setCodeGenOptLevel(CodeGenOpt::None);
 534       break;
 535     case '1':
 536       CodeGen->setCodeGenOptLevel(CodeGenOpt::Less);
 537       break;
 538     case '2':
 539       CodeGen->setCodeGenOptLevel(CodeGenOpt::Default);
 540       break;
 541     case '3':
 542       CodeGen->setCodeGenOptLevel(CodeGenOpt::Aggressive);
 543       break;
 544     }
 545   }
 546   return wrap(CodeGen);
 547 }
 548
 549 void thinlto_codegen_dispose(thinlto_code_gen_t cg) { delete unwrap(cg); }
 550
 551 void thinlto_codegen_add_module(thinlto_code_gen_t cg, const char *Identifier,
 552                                 const char *Data, int Length) {
 553   unwrap(cg)->addModule(Identifier, StringRef(Data, Length));
 554 }
 555
 556 void thinlto_codegen_process(thinlto_code_gen_t cg) { unwrap(cg)->run(); }
 557
 558 unsigned int thinlto_module_get_num_objects(thinlto_code_gen_t cg) {
 559   return unwrap(cg)->getProducedBinaries().size();
 560 }
 561 LTOObjectBuffer thinlto_module_get_object(thinlto_code_gen_t cg,
 562                                           unsigned int index) {
 563   assert(index < unwrap(cg)->getProducedBinaries().size() && "Index overflow");
 564   auto &MemBuffer = unwrap(cg)->getProducedBinaries()[index];
 565   return LTOObjectBuffer{MemBuffer->getBufferStart(),
 566                          MemBuffer->getBufferSize()};
 567 }
 568
 569 unsigned int thinlto_module_get_num_object_files(thinlto_code_gen_t cg) {
 570   return unwrap(cg)->getProducedBinaryFiles().size();
 571 }
 572 const char *thinlto_module_get_object_file(thinlto_code_gen_t cg,
 573                                            unsigned int index) {
 574   assert(index < unwrap(cg)->getProducedBinaryFiles().size() &&
 575          "Index overflow");
 576   return unwrap(cg)->getProducedBinaryFiles()[index].c_str();
 577 }
 578
 579 void thinlto_codegen_disable_codegen(thinlto_code_gen_t cg,
 580                                      lto_bool_t disable) {
 581   unwrap(cg)->disableCodeGen(disable);
 582 }
 583
 584 void thinlto_codegen_set_codegen_only(thinlto_code_gen_t cg,
 585                                       lto_bool_t CodeGenOnly) {
 586   unwrap(cg)->setCodeGenOnly(CodeGenOnly);
 587 }
 588
 589 void thinlto_debug_options(const char *const *options, int number) {
 590   // if options were requested, set them
 591   if (number && options) {
 592     std::vector<const char *> CodegenArgv(1, "libLTO");
 593     append_range(CodegenArgv, ArrayRef<const char *>(options, number));
 594     cl::ParseCommandLineOptions(CodegenArgv.size(), CodegenArgv.data());
 595   }
 596 }
 597
 598 lto_bool_t lto_module_is_thinlto(lto_module_t mod) {
 599   return unwrap(mod)->isThinLTO();
 600 }
 601
 602 void thinlto_codegen_add_must_preserve_symbol(thinlto_code_gen_t cg,
 603                                               const char *Name, int Length) {
 604   unwrap(cg)->preserveSymbol(StringRef(Name, Length));
 605 }
 606
 607 void thinlto_codegen_add_cross_referenced_symbol(thinlto_code_gen_t cg,
 608                                                  const char *Name, int Length) {
 609   unwrap(cg)->crossReferenceSymbol(StringRef(Name, Length));
 610 }
 611
 612 void thinlto_codegen_set_cpu(thinlto_code_gen_t cg, const char *cpu) {
 613   return unwrap(cg)->setCpu(cpu);
 614 }
 615
 616 void thinlto_codegen_set_cache_dir(thinlto_code_gen_t cg,
 617                                    const char *cache_dir) {
 618   return unwrap(cg)->setCacheDir(cache_dir);
 619 }
 620
 621 void thinlto_codegen_set_cache_pruning_interval(thinlto_code_gen_t cg,
 622                                                 int interval) {
 623   return unwrap(cg)->setCachePruningInterval(interval);
 624 }
 625
 626 void thinlto_codegen_set_cache_entry_expiration(thinlto_code_gen_t cg,
 627                                                 unsigned expiration) {
 628   return unwrap(cg)->setCacheEntryExpiration(expiration);
 629 }
 630
 631 void thinlto_codegen_set_final_cache_size_relative_to_available_space(
 632     thinlto_code_gen_t cg, unsigned Percentage) {
 633   return unwrap(cg)->setMaxCacheSizeRelativeToAvailableSpace(Percentage);
 634 }
 635
 636 void thinlto_codegen_set_cache_size_bytes(
 637     thinlto_code_gen_t cg, unsigned MaxSizeBytes) {
 638   return unwrap(cg)->setCacheMaxSizeBytes(MaxSizeBytes);
 639 }
 640
 641 void thinlto_codegen_set_cache_size_megabytes(
 642     thinlto_code_gen_t cg, unsigned MaxSizeMegabytes) {
 643   uint64_t MaxSizeBytes = MaxSizeMegabytes;
 644   MaxSizeBytes *= 1024 * 1024;
 645   return unwrap(cg)->setCacheMaxSizeBytes(MaxSizeBytes);
 646 }
 647
 648 void thinlto_codegen_set_cache_size_files(
 649     thinlto_code_gen_t cg, unsigned MaxSizeFiles) {
 650   return unwrap(cg)->setCacheMaxSizeFiles(MaxSizeFiles);
 651 }
 652
 653 void thinlto_codegen_set_savetemps_dir(thinlto_code_gen_t cg,
 654                                        const char *save_temps_dir) {
 655   return unwrap(cg)->setSaveTempsDir(save_temps_dir);
 656 }
 657
 658 void thinlto_set_generated_objects_dir(thinlto_code_gen_t cg,
 659                                        const char *save_temps_dir) {
 660   unwrap(cg)->setGeneratedObjectsDirectory(save_temps_dir);
 661 }
 662
 663 lto_bool_t thinlto_codegen_set_pic_model(thinlto_code_gen_t cg,
 664                                          lto_codegen_model model) {
 665   switch (model) {
 666   case LTO_CODEGEN_PIC_MODEL_STATIC:
 667     unwrap(cg)->setCodePICModel(Reloc::Static);
 668     return false;
 669   case LTO_CODEGEN_PIC_MODEL_DYNAMIC:
 670     unwrap(cg)->setCodePICModel(Reloc::PIC_);
 671     return false;
 672   case LTO_CODEGEN_PIC_MODEL_DYNAMIC_NO_PIC:
 673     unwrap(cg)->setCodePICModel(Reloc::DynamicNoPIC);
 674     return false;
 675   case LTO_CODEGEN_PIC_MODEL_DEFAULT:
 676     unwrap(cg)->setCodePICModel(None);
 677     return false;
 678   }
 679   sLastErrorString = "Unknown PIC model";
 680   return true;
 681 }
 682
 683 DEFINE_SIMPLE_CONVERSION_FUNCTIONS(lto::InputFile, lto_input_t)
 684
 685 lto_input_t lto_input_create(const void *buffer, size_t buffer_size, const char *path) {
 686   return wrap(LTOModule::createInputFile(buffer, buffer_size, path, sLastErrorString));
 687 }
 688
 689 void lto_input_dispose(lto_input_t input) {
 690   delete unwrap(input);
 691 }
 692
 693 extern unsigned lto_input_get_num_dependent_libraries(lto_input_t input) {
 694   return LTOModule::getDependentLibraryCount(unwrap(input));
 695 }
 696
 697 extern const char *lto_input_get_dependent_library(lto_input_t input,
 698                                                    size_t index,
 699                                                    size_t *size) {
 700   return LTOModule::getDependentLibrary(unwrap(input), index, size);
 701 }
 702
 703 extern const char *const *lto_runtime_lib_symbols_list(size_t *size) {
 704   auto symbols = lto::LTO::getRuntimeLibcallSymbols();
 705   *size = symbols.size();
 706   return symbols.data();
 707 }