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