text: //===-lto.cpp - LLVM Link Time Optimizer ----------------------------------===//
  //
  // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  // See https://llvm.org/LICENSE.txt for license information.
  // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  //
  //===----------------------------------------------------------------------===//
  //
  // This file implements the Link Time Optimization library. This library is
  // intended to be used by linker to optimize code at link time.
  //
  //===----------------------------------------------------------------------===//
  
  #include "llvm-c/lto.h"
  #include "llvm/ADT/STLExtras.h"
  #include "llvm/ADT/StringExtras.h"
  #include "llvm/Bitcode/BitcodeReader.h"
  #include "llvm/CodeGen/CommandFlags.h"
  #include "llvm/IR/DiagnosticInfo.h"
  #include "llvm/IR/DiagnosticPrinter.h"
  #include "llvm/IR/LLVMContext.h"
  #include "llvm/LTO/LTO.h"
  #include "llvm/LTO/legacy/LTOCodeGenerator.h"
  #include "llvm/LTO/legacy/LTOModule.h"
  #include "llvm/LTO/legacy/ThinLTOCodeGenerator.h"
  #include "llvm/Support/MemoryBuffer.h"
  #include "llvm/Support/Signals.h"
  #include "llvm/Support/TargetSelect.h"
  #include "llvm/Support/raw_ostream.h"
  
  using namespace llvm;
  
  static codegen::RegisterCodeGenFlags CGF;
  
  // extra command-line flags needed for LTOCodeGenerator
  static cl::opt<char>
  OptLevel("O",
           cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] "
                    "(default = '-O2')"),
           cl::Prefix,
           cl::ZeroOrMore,
           cl::init('2'));
  
  static cl::opt<bool>
  DisableInline("disable-inlining", cl::init(false),
    cl::desc("Do not run the inliner pass"));
  
  static cl::opt<bool>
  DisableGVNLoadPRE("disable-gvn-loadpre", cl::init(false),
    cl::desc("Do not run the GVN load PRE pass"));
  
  static cl::opt<bool> DisableLTOVectorization(
      "disable-lto-vectorization", cl::init(false),
      cl::desc("Do not run loop or slp vectorization during LTO"));
  
  static cl::opt<bool> EnableFreestanding(
      "lto-freestanding", cl::init(false),
      cl::desc("Enable Freestanding (disable builtins / TLI) during LTO"));
  
  #ifdef NDEBUG
  static bool VerifyByDefault = false;
  #else
  static bool VerifyByDefault = true;
  #endif
  
  static cl::opt<bool> DisableVerify(
      "disable-llvm-verifier", cl::init(!VerifyByDefault),
      cl::desc("Don't run the LLVM verifier during the optimization pipeline"));
  
  // Holds most recent error string.
  // *** Not thread safe ***
  static std::string sLastErrorString;
  
  // Holds the initialization state of the LTO module.
  // *** Not thread safe ***
  static bool initialized = false;
  
  // Holds the command-line option parsing state of the LTO module.
  static bool parsedOptions = false;
  
  static LLVMContext *LTOContext = nullptr;
  
  struct LTOToolDiagnosticHandler : public DiagnosticHandler {
    bool handleDiagnostics(const DiagnosticInfo &DI) override {
      if (DI.getSeverity() != DS_Error) {
        DiagnosticPrinterRawOStream DP(errs());
        DI.print(DP);
        errs() << '\n';
        return true;
      }
      sLastErrorString = "";
      {
        raw_string_ostream Stream(sLastErrorString);
        DiagnosticPrinterRawOStream DP(Stream);
        DI.print(DP);
      }
      return true;
    }
  };
  
  // Initialize the configured targets if they have not been initialized.
  static void lto_initialize() {
    if (!initialized) {
  #ifdef _WIN32
      // Dialog box on crash disabling doesn't work across DLL boundaries, so do
      // it here.
      llvm::sys::DisableSystemDialogsOnCrash();
  #endif
  
      InitializeAllTargetInfos();
      InitializeAllTargets();
      InitializeAllTargetMCs();
      InitializeAllAsmParsers();
      InitializeAllAsmPrinters();
      InitializeAllDisassemblers();
  
      static LLVMContext Context;
      LTOContext = &Context;
      LTOContext->setDiagnosticHandler(
          std::make_unique<LTOToolDiagnosticHandler>(), true);
      initialized = true;
    }
  }
  
  namespace {
  
  static void handleLibLTODiagnostic(lto_codegen_diagnostic_severity_t Severity,
                                     const char *Msg, void *) {
    sLastErrorString = Msg;
  }
  
  // This derived class owns the native object file. This helps implement the
  // libLTO API semantics, which require that the code generator owns the object
  // file.
  struct LibLTOCodeGenerator : LTOCodeGenerator {
    LibLTOCodeGenerator() : LTOCodeGenerator(*LTOContext) { init(); }
    LibLTOCodeGenerator(std::unique_ptr<LLVMContext> Context)
        : LTOCodeGenerator(*Context), OwnedContext(std::move(Context)) {
      init();
    }
  
    // Reset the module first in case MergedModule is created in OwnedContext.
    // Module must be destructed before its context gets destructed.
    ~LibLTOCodeGenerator() { resetMergedModule(); }
  
    void init() { setDiagnosticHandler(handleLibLTODiagnostic, nullptr); }
  
    std::unique_ptr<MemoryBuffer> NativeObjectFile;
    std::unique_ptr<LLVMContext> OwnedContext;
  };
  
  }
  
  DEFINE_SIMPLE_CONVERSION_FUNCTIONS(LibLTOCodeGenerator, lto_code_gen_t)
  DEFINE_SIMPLE_CONVERSION_FUNCTIONS(ThinLTOCodeGenerator, thinlto_code_gen_t)
  DEFINE_SIMPLE_CONVERSION_FUNCTIONS(LTOModule, lto_module_t)
  
  // Convert the subtarget features into a string to pass to LTOCodeGenerator.
  static void lto_add_attrs(lto_code_gen_t cg) {
    LTOCodeGenerator *CG = unwrap(cg);
    auto MAttrs = codegen::getMAttrs();
    if (!MAttrs.empty()) {
      std::string attrs = join(MAttrs, ",");
      CG->setAttr(attrs);
    }
  
    if (OptLevel < '0' || OptLevel > '3')
      report_fatal_error("Optimization level must be between 0 and 3");
    CG->setOptLevel(OptLevel - '0');
    CG->setFreestanding(EnableFreestanding);
  }
  
  extern const char* lto_get_version() {
    return LTOCodeGenerator::getVersionString();
  }
  
  const char* lto_get_error_message() {
    return sLastErrorString.c_str();
  }
  
  bool lto_module_is_object_file(const char* path) {
    return LTOModule::isBitcodeFile(StringRef(path));
  }
  
  bool lto_module_is_object_file_for_target(const char* path,
                                            const char* target_triplet_prefix) {
    ErrorOr<std::unique_ptr<MemoryBuffer>> Buffer = MemoryBuffer::getFile(path);
    if (!Buffer)
      return false;
    return LTOModule::isBitcodeForTarget(Buffer->get(),
                                         StringRef(target_triplet_prefix));
  }
  
  bool lto_module_has_objc_category(const void *mem, size_t length) {
    std::unique_ptr<MemoryBuffer> Buffer(LTOModule::makeBuffer(mem, length));
    if (!Buffer)
      return false;
    LLVMContext Ctx;
    ErrorOr<bool> Result = expectedToErrorOrAndEmitErrors(
        Ctx, llvm::isBitcodeContainingObjCCategory(*Buffer));
    return Result && *Result;
  }
  
  bool lto_module_is_object_file_in_memory(const void* mem, size_t length) {
    return LTOModule::isBitcodeFile(mem, length);
  }
  
  bool
  lto_module_is_object_file_in_memory_for_target(const void* mem,
                                              size_t length,
                                              const char* target_triplet_prefix) {
    std::unique_ptr<MemoryBuffer> buffer(LTOModule::makeBuffer(mem, length));
    if (!buffer)
      return false;
    return LTOModule::isBitcodeForTarget(buffer.get(),
                                         StringRef(target_triplet_prefix));
  }
  
  lto_module_t lto_module_create(const char* path) {
    lto_initialize();
    llvm::TargetOptions Options = codegen::InitTargetOptionsFromCodeGenFlags();
    ErrorOr<std::unique_ptr<LTOModule>> M =
        LTOModule::createFromFile(*LTOContext, StringRef(path), Options);
    if (!M)
      return nullptr;
    return wrap(M->release());
  }
  
  lto_module_t lto_module_create_from_fd(int fd, const char *path, size_t size) {
    lto_initialize();
    llvm::TargetOptions Options = codegen::InitTargetOptionsFromCodeGenFlags();
    ErrorOr<std::unique_ptr<LTOModule>> M = LTOModule::createFromOpenFile(
        *LTOContext, fd, StringRef(path), size, Options);
    if (!M)
      return nullptr;
    return wrap(M->release());
  }
  
  lto_module_t lto_module_create_from_fd_at_offset(int fd, const char *path,
                                                   size_t file_size,
                                                   size_t map_size,
                                                   off_t offset) {
    lto_initialize();
    llvm::TargetOptions Options = codegen::InitTargetOptionsFromCodeGenFlags();
    ErrorOr<std::unique_ptr<LTOModule>> M = LTOModule::createFromOpenFileSlice(
        *LTOContext, fd, StringRef(path), map_size, offset, Options);
    if (!M)
      return nullptr;
    return wrap(M->release());
  }
  
  lto_module_t lto_module_create_from_memory(const void* mem, size_t length) {
    lto_initialize();
    llvm::TargetOptions Options = codegen::InitTargetOptionsFromCodeGenFlags();
    ErrorOr<std::unique_ptr<LTOModule>> M =
        LTOModule::createFromBuffer(*LTOContext, mem, length, Options);
    if (!M)
      return nullptr;
    return wrap(M->release());
  }
  
  lto_module_t lto_module_create_from_memory_with_path(const void* mem,
                                                       size_t length,
                                                       const char *path) {
    lto_initialize();
    llvm::TargetOptions Options = codegen::InitTargetOptionsFromCodeGenFlags();
    ErrorOr<std::unique_ptr<LTOModule>> M = LTOModule::createFromBuffer(
        *LTOContext, mem, length, Options, StringRef(path));
    if (!M)
      return nullptr;
    return wrap(M->release());
  }
  
  lto_module_t lto_module_create_in_local_context(const void *mem, size_t length,
                                                  const char *path) {
    lto_initialize();
    llvm::TargetOptions Options = codegen::InitTargetOptionsFromCodeGenFlags();
  
    // Create a local context. Ownership will be transferred to LTOModule.
    std::unique_ptr<LLVMContext> Context = std::make_unique<LLVMContext>();
    Context->setDiagnosticHandler(std::make_unique<LTOToolDiagnosticHandler>(),
                                  true);
  
    ErrorOr<std::unique_ptr<LTOModule>> M = LTOModule::createInLocalContext(
        std::move(Context), mem, length, Options, StringRef(path));
    if (!M)
      return nullptr;
    return wrap(M->release());
  }
  
  lto_module_t lto_module_create_in_codegen_context(const void *mem,
                                                    size_t length,
                                                    const char *path,
                                                    lto_code_gen_t cg) {
    lto_initialize();
    llvm::TargetOptions Options = codegen::InitTargetOptionsFromCodeGenFlags();
    ErrorOr<std::unique_ptr<LTOModule>> M = LTOModule::createFromBuffer(
        unwrap(cg)->getContext(), mem, length, Options, StringRef(path));
    return wrap(M->release());
  }
  
  void lto_module_dispose(lto_module_t mod) { delete unwrap(mod); }
  
  const char* lto_module_get_target_triple(lto_module_t mod) {
    return unwrap(mod)->getTargetTriple().c_str();
  }
  
  void lto_module_set_target_triple(lto_module_t mod, const char *triple) {
    return unwrap(mod)->setTargetTriple(StringRef(triple));
  }
  
  unsigned int lto_module_get_num_symbols(lto_module_t mod) {
    return unwrap(mod)->getSymbolCount();
  }
  
  const char* lto_module_get_symbol_name(lto_module_t mod, unsigned int index) {
    return unwrap(mod)->getSymbolName(index).data();
  }
  
  lto_symbol_attributes lto_module_get_symbol_attribute(lto_module_t mod,
                                                        unsigned int index) {
    return unwrap(mod)->getSymbolAttributes(index);
  }
  
  const char* lto_module_get_linkeropts(lto_module_t mod) {
    return unwrap(mod)->getLinkerOpts().data();
  }
  
  lto_bool_t lto_module_get_macho_cputype(lto_module_t mod,
                                          unsigned int *out_cputype,
                                          unsigned int *out_cpusubtype) {
    LTOModule *M = unwrap(mod);
    Expected<uint32_t> CPUType = M->getMachOCPUType();
    if (!CPUType) {
      sLastErrorString = toString(CPUType.takeError());
      return true;
    }
    *out_cputype = *CPUType;
  
    Expected<uint32_t> CPUSubType = M->getMachOCPUSubType();
    if (!CPUSubType) {
      sLastErrorString = toString(CPUSubType.takeError());
      return true;
    }
    *out_cpusubtype = *CPUSubType;
  
    return false;
  }
  
  void lto_codegen_set_diagnostic_handler(lto_code_gen_t cg,
                                          lto_diagnostic_handler_t diag_handler,
                                          void *ctxt) {
    unwrap(cg)->setDiagnosticHandler(diag_handler, ctxt);
  }
  
  static lto_code_gen_t createCodeGen(bool InLocalContext) {
    lto_initialize();
  
    TargetOptions Options = codegen::InitTargetOptionsFromCodeGenFlags();
  
    LibLTOCodeGenerator *CodeGen =
        InLocalContext ? new LibLTOCodeGenerator(std::make_unique<LLVMContext>())
                       : new LibLTOCodeGenerator();
    CodeGen->setTargetOptions(Options);
    return wrap(CodeGen);
  }
  
  lto_code_gen_t lto_codegen_create(void) {
    return createCodeGen(/* InLocalContext */ false);
  }
  
  lto_code_gen_t lto_codegen_create_in_local_context(void) {
    return createCodeGen(/* InLocalContext */ true);
  }
  
  void lto_codegen_dispose(lto_code_gen_t cg) { delete unwrap(cg); }
  
  bool lto_codegen_add_module(lto_code_gen_t cg, lto_module_t mod) {
    return !unwrap(cg)->addModule(unwrap(mod));
  }
  
  void lto_codegen_set_module(lto_code_gen_t cg, lto_module_t mod) {
    unwrap(cg)->setModule(std::unique_ptr<LTOModule>(unwrap(mod)));
  }
  
  bool lto_codegen_set_debug_model(lto_code_gen_t cg, lto_debug_model debug) {
    unwrap(cg)->setDebugInfo(debug);
    return false;
  }
  
  bool lto_codegen_set_pic_model(lto_code_gen_t cg, lto_codegen_model model) {
    switch (model) {
    case LTO_CODEGEN_PIC_MODEL_STATIC:
      unwrap(cg)->setCodePICModel(Reloc::Static);
      return false;
    case LTO_CODEGEN_PIC_MODEL_DYNAMIC:
      unwrap(cg)->setCodePICModel(Reloc::PIC_);
      return false;
    case LTO_CODEGEN_PIC_MODEL_DYNAMIC_NO_PIC:
      unwrap(cg)->setCodePICModel(Reloc::DynamicNoPIC);
      return false;
    case LTO_CODEGEN_PIC_MODEL_DEFAULT:
      unwrap(cg)->setCodePICModel(None);
      return false;
    }
    sLastErrorString = "Unknown PIC model";
    return true;
  }
  
  void lto_codegen_set_cpu(lto_code_gen_t cg, const char *cpu) {
    return unwrap(cg)->setCpu(cpu);
  }
  
  void lto_codegen_set_assembler_path(lto_code_gen_t cg, const char *path) {
    // In here only for backwards compatibility. We use MC now.
  }
  
  void lto_codegen_set_assembler_args(lto_code_gen_t cg, const char **args,
                                      int nargs) {
    // In here only for backwards compatibility. We use MC now.
  }
  
  void lto_codegen_add_must_preserve_symbol(lto_code_gen_t cg,
                                            const char *symbol) {
    unwrap(cg)->addMustPreserveSymbol(symbol);
  }
  
  static void maybeParseOptions(lto_code_gen_t cg) {
    if (!parsedOptions) {
      unwrap(cg)->parseCodeGenDebugOptions();
      lto_add_attrs(cg);
      parsedOptions = true;
    }
  }
  
  bool lto_codegen_write_merged_modules(lto_code_gen_t cg, const char *path) {
    maybeParseOptions(cg);
    return !unwrap(cg)->writeMergedModules(path);
  }
  
  const void *lto_codegen_compile(lto_code_gen_t cg, size_t *length) {
    maybeParseOptions(cg);
    LibLTOCodeGenerator *CG = unwrap(cg);
    CG->NativeObjectFile =
        CG->compile(DisableVerify, DisableInline, DisableGVNLoadPRE,
                    DisableLTOVectorization);
    if (!CG->NativeObjectFile)
      return nullptr;
    *length = CG->NativeObjectFile->getBufferSize();
    return CG->NativeObjectFile->getBufferStart();
  }
  
  bool lto_codegen_optimize(lto_code_gen_t cg) {
    maybeParseOptions(cg);
    return !unwrap(cg)->optimize(DisableVerify, DisableInline, DisableGVNLoadPRE,
                                 DisableLTOVectorization);
  }
  
  const void *lto_codegen_compile_optimized(lto_code_gen_t cg, size_t *length) {
    maybeParseOptions(cg);
    LibLTOCodeGenerator *CG = unwrap(cg);
    CG->NativeObjectFile = CG->compileOptimized();
    if (!CG->NativeObjectFile)
      return nullptr;
    *length = CG->NativeObjectFile->getBufferSize();
    return CG->NativeObjectFile->getBufferStart();
  }
  
  bool lto_codegen_compile_to_file(lto_code_gen_t cg, const char **name) {
    maybeParseOptions(cg);
    return !unwrap(cg)->compile_to_file(
        name, DisableVerify, DisableInline, DisableGVNLoadPRE,
        DisableLTOVectorization);
  }
  
  void lto_codegen_debug_options(lto_code_gen_t cg, const char *opt) {
    std::vector<const char *> Options;
    for (std::pair<StringRef, StringRef> o = getToken(opt); !o.first.empty();
         o = getToken(o.second))
      Options.push_back(o.first.data());
  
    unwrap(cg)->setCodeGenDebugOptions(Options);
  }
  
  void lto_codegen_debug_options_array(lto_code_gen_t cg,
                                       const char *const *options, int number) {
    unwrap(cg)->setCodeGenDebugOptions(makeArrayRef(options, number));
  }
  
  unsigned int lto_api_version() { return LTO_API_VERSION; }
  
  void lto_codegen_set_should_internalize(lto_code_gen_t cg,
                                          bool ShouldInternalize) {
    unwrap(cg)->setShouldInternalize(ShouldInternalize);
  }
  
  void lto_codegen_set_should_embed_uselists(lto_code_gen_t cg,
                                             lto_bool_t ShouldEmbedUselists) {
    unwrap(cg)->setShouldEmbedUselists(ShouldEmbedUselists);
  }
  
  // ThinLTO API below
  
  thinlto_code_gen_t thinlto_create_codegen(void) {
    lto_initialize();
    ThinLTOCodeGenerator *CodeGen = new ThinLTOCodeGenerator();
    CodeGen->setTargetOptions(codegen::InitTargetOptionsFromCodeGenFlags());
    CodeGen->setFreestanding(EnableFreestanding);
  
    if (OptLevel.getNumOccurrences()) {
      if (OptLevel < '0' || OptLevel > '3')
        report_fatal_error("Optimization level must be between 0 and 3");
      CodeGen->setOptLevel(OptLevel - '0');
      switch (OptLevel) {
      case '0':
        CodeGen->setCodeGenOptLevel(CodeGenOpt::None);
        break;
      case '1':
        CodeGen->setCodeGenOptLevel(CodeGenOpt::Less);
        break;
      case '2':
        CodeGen->setCodeGenOptLevel(CodeGenOpt::Default);
        break;
      case '3':
        CodeGen->setCodeGenOptLevel(CodeGenOpt::Aggressive);
        break;
      }
    }
    return wrap(CodeGen);
  }
  
  void thinlto_codegen_dispose(thinlto_code_gen_t cg) { delete unwrap(cg); }
  
  void thinlto_codegen_add_module(thinlto_code_gen_t cg, const char *Identifier,
                                  const char *Data, int Length) {
    unwrap(cg)->addModule(Identifier, StringRef(Data, Length));
  }
  
  void thinlto_codegen_process(thinlto_code_gen_t cg) { unwrap(cg)->run(); }
  
  unsigned int thinlto_module_get_num_objects(thinlto_code_gen_t cg) {
    return unwrap(cg)->getProducedBinaries().size();
  }
  LTOObjectBuffer thinlto_module_get_object(thinlto_code_gen_t cg,
                                            unsigned int index) {
    assert(index < unwrap(cg)->getProducedBinaries().size() && "Index overflow");
    auto &MemBuffer = unwrap(cg)->getProducedBinaries()[index];
    return LTOObjectBuffer{MemBuffer->getBufferStart(),
                           MemBuffer->getBufferSize()};
  }
  
  unsigned int thinlto_module_get_num_object_files(thinlto_code_gen_t cg) {
    return unwrap(cg)->getProducedBinaryFiles().size();
  }
  const char *thinlto_module_get_object_file(thinlto_code_gen_t cg,
                                             unsigned int index) {
    assert(index < unwrap(cg)->getProducedBinaryFiles().size() &&
           "Index overflow");
    return unwrap(cg)->getProducedBinaryFiles()[index].c_str();
  }
  
  void thinlto_codegen_disable_codegen(thinlto_code_gen_t cg,
                                       lto_bool_t disable) {
    unwrap(cg)->disableCodeGen(disable);
  }
  
  void thinlto_codegen_set_codegen_only(thinlto_code_gen_t cg,
                                        lto_bool_t CodeGenOnly) {
    unwrap(cg)->setCodeGenOnly(CodeGenOnly);
  }
  
  void thinlto_debug_options(const char *const *options, int number) {
    // if options were requested, set them
    if (number && options) {
      std::vector<const char *> CodegenArgv(1, "libLTO");
      for (auto Arg : ArrayRef<const char *>(options, number))
        CodegenArgv.push_back(Arg);
      cl::ParseCommandLineOptions(CodegenArgv.size(), CodegenArgv.data());
    }
  }
  
  lto_bool_t lto_module_is_thinlto(lto_module_t mod) {
    return unwrap(mod)->isThinLTO();
  }
  
  void thinlto_codegen_add_must_preserve_symbol(thinlto_code_gen_t cg,
                                                const char *Name, int Length) {
    unwrap(cg)->preserveSymbol(StringRef(Name, Length));
  }
  
  void thinlto_codegen_add_cross_referenced_symbol(thinlto_code_gen_t cg,
                                                   const char *Name, int Length) {
    unwrap(cg)->crossReferenceSymbol(StringRef(Name, Length));
  }
  
  void thinlto_codegen_set_cpu(thinlto_code_gen_t cg, const char *cpu) {
    return unwrap(cg)->setCpu(cpu);
  }
  
  void thinlto_codegen_set_cache_dir(thinlto_code_gen_t cg,
                                     const char *cache_dir) {
    return unwrap(cg)->setCacheDir(cache_dir);
  }
  
  void thinlto_codegen_set_cache_pruning_interval(thinlto_code_gen_t cg,
                                                  int interval) {
    return unwrap(cg)->setCachePruningInterval(interval);
  }
  
  void thinlto_codegen_set_cache_entry_expiration(thinlto_code_gen_t cg,
                                                  unsigned expiration) {
    return unwrap(cg)->setCacheEntryExpiration(expiration);
  }
  
  void thinlto_codegen_set_final_cache_size_relative_to_available_space(
      thinlto_code_gen_t cg, unsigned Percentage) {
    return unwrap(cg)->setMaxCacheSizeRelativeToAvailableSpace(Percentage);
  }
  
  void thinlto_codegen_set_cache_size_bytes(
      thinlto_code_gen_t cg, unsigned MaxSizeBytes) {
    return unwrap(cg)->setCacheMaxSizeBytes(MaxSizeBytes);
  }
  
  void thinlto_codegen_set_cache_size_megabytes(
      thinlto_code_gen_t cg, unsigned MaxSizeMegabytes) {
    uint64_t MaxSizeBytes = MaxSizeMegabytes;
    MaxSizeBytes *= 1024 * 1024;
    return unwrap(cg)->setCacheMaxSizeBytes(MaxSizeBytes);
  }
  
  void thinlto_codegen_set_cache_size_files(
      thinlto_code_gen_t cg, unsigned MaxSizeFiles) {
    return unwrap(cg)->setCacheMaxSizeFiles(MaxSizeFiles);
  }
  
  void thinlto_codegen_set_savetemps_dir(thinlto_code_gen_t cg,
                                         const char *save_temps_dir) {
    return unwrap(cg)->setSaveTempsDir(save_temps_dir);
  }
  
  void thinlto_set_generated_objects_dir(thinlto_code_gen_t cg,
                                         const char *save_temps_dir) {
    unwrap(cg)->setGeneratedObjectsDirectory(save_temps_dir);
  }
  
  lto_bool_t thinlto_codegen_set_pic_model(thinlto_code_gen_t cg,
                                           lto_codegen_model model) {
    switch (model) {
    case LTO_CODEGEN_PIC_MODEL_STATIC:
      unwrap(cg)->setCodePICModel(Reloc::Static);
      return false;
    case LTO_CODEGEN_PIC_MODEL_DYNAMIC:
      unwrap(cg)->setCodePICModel(Reloc::PIC_);
      return false;
    case LTO_CODEGEN_PIC_MODEL_DYNAMIC_NO_PIC:
      unwrap(cg)->setCodePICModel(Reloc::DynamicNoPIC);
      return false;
    case LTO_CODEGEN_PIC_MODEL_DEFAULT:
      unwrap(cg)->setCodePICModel(None);
      return false;
    }
    sLastErrorString = "Unknown PIC model";
    return true;
  }
  
  DEFINE_SIMPLE_CONVERSION_FUNCTIONS(lto::InputFile, lto_input_t)
  
  lto_input_t lto_input_create(const void *buffer, size_t buffer_size, const char *path) {
    return wrap(LTOModule::createInputFile(buffer, buffer_size, path, sLastErrorString));
  }
  
  void lto_input_dispose(lto_input_t input) {
    delete unwrap(input);
  }
  
  extern unsigned lto_input_get_num_dependent_libraries(lto_input_t input) {
    return LTOModule::getDependentLibraryCount(unwrap(input));
  }
  
  extern const char *lto_input_get_dependent_library(lto_input_t input,
                                                     size_t index,
                                                     size_t *size) {
    return LTOModule::getDependentLibrary(unwrap(input), index, size);
  }
  
  extern const char *const *lto_runtime_lib_symbols_list(size_t *size) {
    auto symbols = lto::LTO::getRuntimeLibcallSymbols();
    *size = symbols.size();
    return symbols.data();
  }
  