C++ TargetLibraryInfoImpl::disableAllFunctions方法代码示例

static TargetLibraryInfoImpl *createTLII(llvm::Triple &TargetTriple,
                                         const CodeGenOptions &CodeGenOpts) {
  TargetLibraryInfoImpl *TLII = new TargetLibraryInfoImpl(TargetTriple);
  if (!CodeGenOpts.SimplifyLibCalls)
    TLII->disableAllFunctions();
  else {
    // Disable individual libc/libm calls in TargetLibraryInfo.
    LibFunc::Func F;
    for (auto &FuncName : CodeGenOpts.getNoBuiltinFuncs())
      if (TLII->getLibFunc(FuncName, F))
        TLII->setUnavailable(F);
  }

  switch (CodeGenOpts.getVecLib()) {
  case CodeGenOptions::Accelerate:
    TLII->addVectorizableFunctionsFromVecLib(TargetLibraryInfoImpl::Accelerate);
    break;
  case CodeGenOptions::SVML:
    TLII->addVectorizableFunctionsFromVecLib(TargetLibraryInfoImpl::SVML);
    break;
  default:
    break;
  }
  return TLII;
}

bool EmitAssemblyHelper::AddEmitPasses(BackendAction Action,
                                       raw_pwrite_stream &OS) {

  // Create the code generator passes.
  legacy::PassManager *PM = getCodeGenPasses();

  // Add LibraryInfo.
  llvm::Triple TargetTriple(TheModule->getTargetTriple());
  TargetLibraryInfoImpl *TLII = new TargetLibraryInfoImpl(TargetTriple);
  if (!CodeGenOpts.SimplifyLibCalls)
    TLII->disableAllFunctions();
  PM->add(new TargetLibraryInfoWrapperPass(*TLII));

  // Add Target specific analysis passes.
  //TM->addAnalysisPasses(*PM);

  // Normal mode, emit a .s or .o file by running the code generator. Note,
  // this also adds codegenerator level optimization passes.
  TargetMachine::CodeGenFileType CGFT = TargetMachine::CGFT_AssemblyFile;
  if (Action == Backend_EmitObj)
    CGFT = TargetMachine::CGFT_ObjectFile;
  else if (Action == Backend_EmitMCNull)
    CGFT = TargetMachine::CGFT_Null;
  else
    assert(Action == Backend_EmitAssembly && "Invalid action!");

  if (TM->addPassesToEmitFile(*PM, OS, CGFT,
                              /*DisableVerify=*/!CodeGenOpts.VerifyModule)) {
    Diags.Report(diag::err_fe_unable_to_interface_with_target);
    return false;
  }

  return true;
}

static TargetLibraryInfoImpl *createTLII(llvm::Triple &TargetTriple,
                                         const CodeGenOptions &CodeGenOpts) {
  TargetLibraryInfoImpl *TLII = new TargetLibraryInfoImpl(TargetTriple);
  if (!CodeGenOpts.SimplifyLibCalls)
    TLII->disableAllFunctions();
  return TLII;
}

// Unfortunately, the LLVM C API doesn't provide a way to set the `LibraryInfo`
// field of a PassManagerBuilder, we expose our own method of doing so.
extern "C" void LLVMRustAddBuilderLibraryInfo(LLVMPassManagerBuilderRef PMBR,
                                              LLVMModuleRef M,
                                              bool DisableSimplifyLibCalls) {
  Triple TargetTriple(unwrap(M)->getTargetTriple());
  TargetLibraryInfoImpl *TLI = new TargetLibraryInfoImpl(TargetTriple);
  if (DisableSimplifyLibCalls)
    TLI->disableAllFunctions();
  unwrap(PMBR)->LibraryInfo = TLI;
}

// Unfortunately, the LLVM C API doesn't provide a way to set the `LibraryInfo`
// field of a PassManagerBuilder, we expose our own method of doing so.
extern "C" void
LLVMRustAddBuilderLibraryInfo(LLVMPassManagerBuilderRef PMB,
                              LLVMModuleRef M,
                              bool DisableSimplifyLibCalls) {
    Triple TargetTriple(unwrap(M)->getTargetTriple());
#if LLVM_VERSION_MINOR >= 7
    TargetLibraryInfoImpl *TLI = new TargetLibraryInfoImpl(TargetTriple);
#else
    TargetLibraryInfo *TLI = new TargetLibraryInfo(TargetTriple);
#endif
    if (DisableSimplifyLibCalls)
      TLI->disableAllFunctions();
    unwrap(PMB)->LibraryInfo = TLI;
}

static TargetLibraryInfoImpl *createTLII(llvm::Triple &TargetTriple,
                                         const CodeGenOptions &CodeGenOpts) {
  TargetLibraryInfoImpl *TLII = new TargetLibraryInfoImpl(TargetTriple);
  if (!CodeGenOpts.SimplifyLibCalls)
    TLII->disableAllFunctions();

  switch (CodeGenOpts.getVecLib()) {
  case CodeGenOptions::Accelerate:
    TLII->addVectorizableFunctionsFromVecLib(TargetLibraryInfoImpl::Accelerate);
    break;
  default:
    break;
  }
  return TLII;
}

//////////////////////////////////////////////////////////////////////////////////////////
// This function runs optimization passes based on command line arguments.
// Returns true if any optimization passes were invoked.
bool ldc_optimize_module(llvm::Module *M)
{
    // Create a PassManager to hold and optimize the collection of
    // per-module passes we are about to build.
#if LDC_LLVM_VER >= 307
    legacy::
#endif
    PassManager mpm;

#if LDC_LLVM_VER >= 307
    // Add an appropriate TargetLibraryInfo pass for the module's triple.
    TargetLibraryInfoImpl *tlii = new TargetLibraryInfoImpl(Triple(M->getTargetTriple()));

    // The -disable-simplify-libcalls flag actually disables all builtin optzns.
    if (disableSimplifyLibCalls)
      tlii->disableAllFunctions();

    mpm.add(new TargetLibraryInfoWrapperPass(*tlii));
#else
    // Add an appropriate TargetLibraryInfo pass for the module's triple.
    TargetLibraryInfo *tli = new TargetLibraryInfo(Triple(M->getTargetTriple()));

    // The -disable-simplify-libcalls flag actually disables all builtin optzns.
    if (disableSimplifyLibCalls)
      tli->disableAllFunctions();

    mpm.add(tli);
#endif

    // Add an appropriate DataLayout instance for this module.
#if LDC_LLVM_VER >= 307
    // The DataLayout is already set at the module (in module.cpp,
    // method Module::genLLVMModule())
    // FIXME: Introduce new command line switch default-data-layout to
    // override the module data layout
#elif LDC_LLVM_VER == 306
    mpm.add(new DataLayoutPass());
#elif LDC_LLVM_VER == 305
    const DataLayout *DL = M->getDataLayout();
    assert(DL && "DataLayout not set at module");
    mpm.add(new DataLayoutPass(*DL));
#elif LDC_LLVM_VER >= 302
    mpm.add(new DataLayout(M));
#else
    mpm.add(new TargetData(M));
#endif

#if LDC_LLVM_VER >= 307
    // Add internal analysis passes from the target machine.
    mpm.add(createTargetTransformInfoWrapperPass(gTargetMachine->getTargetIRAnalysis()));
#elif LDC_LLVM_VER >= 305
    // Add internal analysis passes from the target machine.
    gTargetMachine->addAnalysisPasses(mpm);
#endif

    // Also set up a manager for the per-function passes.
#if LDC_LLVM_VER >= 307
    legacy::
#endif
    FunctionPassManager fpm(M);

#if LDC_LLVM_VER >= 307
    // Add internal analysis passes from the target machine.
    fpm.add(createTargetTransformInfoWrapperPass(gTargetMachine->getTargetIRAnalysis()));
#elif LDC_LLVM_VER >= 306
    fpm.add(new DataLayoutPass());
    gTargetMachine->addAnalysisPasses(fpm);
#elif LDC_LLVM_VER == 305
    fpm.add(new DataLayoutPass(M));
    gTargetMachine->addAnalysisPasses(fpm);
#elif LDC_LLVM_VER >= 302
    fpm.add(new DataLayout(M));
#else
    fpm.add(new TargetData(M));
#endif

    // If the -strip-debug command line option was specified, add it before
    // anything else.
    if (stripDebug)
        mpm.add(createStripSymbolsPass(true));

    bool defaultsAdded = false;
    // Create a new optimization pass for each one specified on the command line
    for (unsigned i = 0; i < passList.size(); ++i) {
        if (optimizeLevel && optimizeLevel.getPosition() < passList.getPosition(i)) {
            addOptimizationPasses(mpm, fpm, optLevel(), sizeLevel());
            defaultsAdded = true;
        }

        const PassInfo *passInf = passList[i];
        Pass *pass = 0;
        if (passInf->getNormalCtor())
            pass = passInf->getNormalCtor()();
        else {
            const char* arg = passInf->getPassArgument(); // may return null
            if (arg)
                error(Loc(), "Can't create pass '-%s' (%s)", arg, pass->getPassName());
//.........这里部分代码省略.........

//.........这里部分代码省略.........
    }
    break;
  case Triple::Linux:
    // exp10, exp10f, exp10l is available on Linux (GLIBC) but are extremely
    // buggy prior to glibc version 2.18. Until this version is widely deployed
    // or we have a reasonable detection strategy, we cannot use exp10 reliably
    // on Linux.
    //
    // Fall through to disable all of them.
  default:
    TLI.setUnavailable(LibFunc::exp10);
    TLI.setUnavailable(LibFunc::exp10f);
    TLI.setUnavailable(LibFunc::exp10l);
  }

  // ffsl is available on at least Darwin, Mac OS X, iOS, FreeBSD, and
  // Linux (GLIBC):
  // http://developer.apple.com/library/mac/#documentation/Darwin/Reference/ManPages/man3/ffsl.3.html
  // http://svn.freebsd.org/base/head/lib/libc/string/ffsl.c
  // http://www.gnu.org/software/gnulib/manual/html_node/ffsl.html
  switch (T.getOS()) {
  case Triple::Darwin:
  case Triple::MacOSX:
  case Triple::IOS:
  case Triple::TvOS:
  case Triple::WatchOS:
  case Triple::FreeBSD:
  case Triple::Linux:
    break;
  default:
    TLI.setUnavailable(LibFunc::ffsl);
  }

  // ffsll is available on at least FreeBSD and Linux (GLIBC):
  // http://svn.freebsd.org/base/head/lib/libc/string/ffsll.c
  // http://www.gnu.org/software/gnulib/manual/html_node/ffsll.html
  switch (T.getOS()) {
  case Triple::Darwin:
  case Triple::MacOSX:
  case Triple::IOS:
  case Triple::TvOS:
  case Triple::WatchOS:
  case Triple::FreeBSD:
  case Triple::Linux:
    break;
  default:
    TLI.setUnavailable(LibFunc::ffsll);
  }

  // The following functions are available on at least FreeBSD:
  // http://svn.freebsd.org/base/head/lib/libc/string/fls.c
  // http://svn.freebsd.org/base/head/lib/libc/string/flsl.c
  // http://svn.freebsd.org/base/head/lib/libc/string/flsll.c
  if (!T.isOSFreeBSD()) {
    TLI.setUnavailable(LibFunc::fls);
    TLI.setUnavailable(LibFunc::flsl);
    TLI.setUnavailable(LibFunc::flsll);
  }

  // The following functions are available on at least Linux:
  if (!T.isOSLinux()) {
    TLI.setUnavailable(LibFunc::dunder_strdup);
    TLI.setUnavailable(LibFunc::dunder_strtok_r);
    TLI.setUnavailable(LibFunc::dunder_isoc99_scanf);
    TLI.setUnavailable(LibFunc::dunder_isoc99_sscanf);
    TLI.setUnavailable(LibFunc::under_IO_getc);
    TLI.setUnavailable(LibFunc::under_IO_putc);
    TLI.setUnavailable(LibFunc::memalign);
    TLI.setUnavailable(LibFunc::fopen64);
    TLI.setUnavailable(LibFunc::fseeko64);
    TLI.setUnavailable(LibFunc::fstat64);
    TLI.setUnavailable(LibFunc::fstatvfs64);
    TLI.setUnavailable(LibFunc::ftello64);
    TLI.setUnavailable(LibFunc::lstat64);
    TLI.setUnavailable(LibFunc::open64);
    TLI.setUnavailable(LibFunc::stat64);
    TLI.setUnavailable(LibFunc::statvfs64);
    TLI.setUnavailable(LibFunc::tmpfile64);
  }

  // As currently implemented in clang, NVPTX code has no standard library to
  // speak of.  Headers provide a standard-ish library implementation, but many
  // of the signatures are wrong -- for example, many libm functions are not
  // extern "C".
  //
  // libdevice, an IR library provided by nvidia, is linked in by the front-end,
  // but only used functions are provided to llvm.  Moreover, most of the
  // functions in libdevice don't map precisely to standard library functions.
  //
  // FIXME: Having no standard library prevents e.g. many fastmath
  // optimizations, so this situation should be fixed.
  if (T.isNVPTX()) {
    TLI.disableAllFunctions();
    TLI.setAvailable(LibFunc::nvvm_reflect);
  } else {
    TLI.setUnavailable(LibFunc::nvvm_reflect);
  }

  TLI.addVectorizableFunctionsFromVecLib(ClVectorLibrary);
}

////////////////////////////////////////////////////////////////////////////////
// This function runs optimization passes based on command line arguments.
// Returns true if any optimization passes were invoked.
bool ldc_optimize_module(llvm::Module *M) {
// Create a PassManager to hold and optimize the collection of
// per-module passes we are about to build.
#if LDC_LLVM_VER >= 307
  legacy::
#endif
      PassManager mpm;

#if LDC_LLVM_VER >= 307
  // Add an appropriate TargetLibraryInfo pass for the module's triple.
  TargetLibraryInfoImpl *tlii =
      new TargetLibraryInfoImpl(Triple(M->getTargetTriple()));

  // The -disable-simplify-libcalls flag actually disables all builtin optzns.
  if (disableSimplifyLibCalls)
    tlii->disableAllFunctions();

  mpm.add(new TargetLibraryInfoWrapperPass(*tlii));
#else
  // Add an appropriate TargetLibraryInfo pass for the module's triple.
  TargetLibraryInfo *tli = new TargetLibraryInfo(Triple(M->getTargetTriple()));

  // The -disable-simplify-libcalls flag actually disables all builtin optzns.
  if (disableSimplifyLibCalls) {
    tli->disableAllFunctions();
  }

  mpm.add(tli);
#endif

// Add an appropriate DataLayout instance for this module.
#if LDC_LLVM_VER >= 307
// The DataLayout is already set at the module (in module.cpp,
// method Module::genLLVMModule())
// FIXME: Introduce new command line switch default-data-layout to
// override the module data layout
#elif LDC_LLVM_VER == 306
  mpm.add(new DataLayoutPass());
#else
                                    const DataLayout *DL = M->getDataLayout();
                                    assert(DL &&
                                           "DataLayout not set at module");
                                    mpm.add(new DataLayoutPass(*DL));
#endif

#if LDC_LLVM_VER >= 307
  // Add internal analysis passes from the target machine.
  mpm.add(createTargetTransformInfoWrapperPass(
      gTargetMachine->getTargetIRAnalysis()));
#else
  // Add internal analysis passes from the target machine.
  gTargetMachine->addAnalysisPasses(mpm);
#endif

// Also set up a manager for the per-function passes.
#if LDC_LLVM_VER >= 307
  legacy::
#endif
      FunctionPassManager fpm(M);

#if LDC_LLVM_VER >= 307
  // Add internal analysis passes from the target machine.
  fpm.add(createTargetTransformInfoWrapperPass(
      gTargetMachine->getTargetIRAnalysis()));
#elif LDC_LLVM_VER >= 306
  fpm.add(new DataLayoutPass());
  gTargetMachine->addAnalysisPasses(fpm);
#else
                                    fpm.add(new DataLayoutPass(M));
                                    gTargetMachine->addAnalysisPasses(fpm);
#endif

  // If the -strip-debug command line option was specified, add it before
  // anything else.
  if (stripDebug) {
    mpm.add(createStripSymbolsPass(true));
  }

  addOptimizationPasses(mpm, fpm, optLevel(), sizeLevel());

  // Run per-function passes.
  fpm.doInitialization();
  for (auto &F : *M) {
    fpm.run(F);
  }
  fpm.doFinalization();

  // Run per-module passes.
  mpm.run(*M);

  // Verify the resulting module.
  verifyModule(M);

  // Report that we run some passes.
  return true;
}