C++ iterator::isMaterializable方法代码示例

//.........这里部分代码省略.........
  std::unique_ptr<legacy::PassManagerBase> PM;
  if (LazyBitcode)
    PM.reset(new legacy::FunctionPassManager(ModuleRef));
  else
    PM.reset(new legacy::PassManager());

  // Add the target data from the target machine, if it exists, or the module.
  if (const DataLayout *DL = Target.getDataLayout())
    ModuleRef->setDataLayout(*DL);

  // For conformance with llc, we let the user disable LLVM IR verification with
  // -disable-verify. Unlike llc, when LLVM IR verification is enabled we only
  // run it once, before PNaCl ABI verification.
  if (!NoVerify)
    PM->add(createVerifierPass());

  // Add the ABI verifier pass before the analysis and code emission passes.
  if (PNaClABIVerify)
    PM->add(createPNaClABIVerifyFunctionsPass(&ABIErrorReporter));

  // Add the intrinsic resolution pass. It assumes ABI-conformant code.
  PM->add(createResolvePNaClIntrinsicsPass());

  // Add an appropriate TargetLibraryInfo pass for the module's triple.
  TargetLibraryInfoImpl TLII(TheTriple);

  // The -disable-simplify-libcalls flag actually disables all builtin optzns.
  if (DisableSimplifyLibCalls)
    TLII.disableAllFunctions();
  PM->add(new TargetLibraryInfoWrapperPass(TLII));

  // Allow subsequent passes and the backend to better optimize instructions
  // that were simplified for PNaCl's ABI. This pass uses the TargetLibraryInfo
  // above.
  PM->add(createBackendCanonicalizePass());

  // Ask the target to add backend passes as necessary. We explicitly ask it
  // not to add the verifier pass because we added it earlier.
  if (Target.addPassesToEmitFile(*PM, OS, FileType,
                                 /* DisableVerify */ true)) {
    errs() << ProgramName
    << ": target does not support generation of this file type!\n";
    return 1;
  }

  if (LazyBitcode) {
    auto FPM = static_cast<legacy::FunctionPassManager *>(PM.get());
    FPM->doInitialization();
    unsigned FuncIndex = 0;
    switch (SplitModuleSched) {
    case SplitModuleStatic:
      for (Function &F : *ModuleRef) {
        if (FuncQueue->GrabFunctionStatic(FuncIndex, ModuleIndex)) {
          FPM->run(F);
          CheckABIVerifyErrors(ABIErrorReporter, "Function " + F.getName());
          F.Dematerialize();
        }
        ++FuncIndex;
      }
      break;
    case SplitModuleDynamic:
      unsigned ChunkSize = 0;
      unsigned NumFunctions = FuncQueue->Size();
      Module::iterator I = ModuleRef->begin();
      while (FuncIndex < NumFunctions) {
        ChunkSize = FuncQueue->RecommendedChunkSize();
        unsigned NextIndex;
        bool grabbed = FuncQueue->GrabFunctionDynamic(FuncIndex, ChunkSize,
                                                      NextIndex);
        if (grabbed) {
          while (FuncIndex < NextIndex) {
            if (!I->isMaterializable() && I->isDeclaration()) {
              ++I;
              continue;
            }
            FPM->run(*I);
            CheckABIVerifyErrors(ABIErrorReporter, "Function " + I->getName());
            I->Dematerialize();
            ++FuncIndex;
            ++I;
          }
        } else {
          while (FuncIndex < NextIndex) {
            if (!I->isMaterializable() && I->isDeclaration()) {
              ++I;
              continue;
            }
            ++FuncIndex;
            ++I;
          }
        }
      }
      break;
    }
    FPM->doFinalization();
  } else
    static_cast<legacy::PassManager *>(PM.get())->run(*ModuleRef);

  return 0;
}

bool ModuleLinker::run() {
  assert(DstM && "Null destination module");
  assert(SrcM && "Null source module");

  // Inherit the target data from the source module if the destination module
  // doesn't have one already.
  if (DstM->getDataLayout().empty() && !SrcM->getDataLayout().empty())
    DstM->setDataLayout(SrcM->getDataLayout());

  // Copy the target triple from the source to dest if the dest's is empty.
  if (DstM->getTargetTriple().empty() && !SrcM->getTargetTriple().empty())
    DstM->setTargetTriple(SrcM->getTargetTriple());

  if (!SrcM->getDataLayout().empty() && !DstM->getDataLayout().empty() &&
      SrcM->getDataLayout() != DstM->getDataLayout())
    errs() << "WARNING: Linking two modules of different data layouts!\n";
  if (!SrcM->getTargetTriple().empty() &&
      DstM->getTargetTriple() != SrcM->getTargetTriple()) {
    errs() << "WARNING: Linking two modules of different target triples: ";
    if (!SrcM->getModuleIdentifier().empty())
      errs() << SrcM->getModuleIdentifier() << ": ";
    errs() << "'" << SrcM->getTargetTriple() << "' and '" 
           << DstM->getTargetTriple() << "'\n";
  }

  // Append the module inline asm string.
  if (!SrcM->getModuleInlineAsm().empty()) {
    if (DstM->getModuleInlineAsm().empty())
      DstM->setModuleInlineAsm(SrcM->getModuleInlineAsm());
    else
      DstM->setModuleInlineAsm(DstM->getModuleInlineAsm()+"\n"+
                               SrcM->getModuleInlineAsm());
  }

  // Update the destination module's dependent libraries list with the libraries
  // from the source module. There's no opportunity for duplicates here as the
  // Module ensures that duplicate insertions are discarded.
  for (Module::lib_iterator SI = SrcM->lib_begin(), SE = SrcM->lib_end();
       SI != SE; ++SI)
    DstM->addLibrary(*SI);
  
  // If the source library's module id is in the dependent library list of the
  // destination library, remove it since that module is now linked in.
  StringRef ModuleId = SrcM->getModuleIdentifier();
  if (!ModuleId.empty())
    DstM->removeLibrary(sys::path::stem(ModuleId));
  
  // Loop over all of the linked values to compute type mappings.
  computeTypeMapping();

  // Insert all of the globals in src into the DstM module... without linking
  // initializers (which could refer to functions not yet mapped over).
  for (Module::global_iterator I = SrcM->global_begin(),
       E = SrcM->global_end(); I != E; ++I)
    if (linkGlobalProto(I))
      return true;

  // Link the functions together between the two modules, without doing function
  // bodies... this just adds external function prototypes to the DstM
  // function...  We do this so that when we begin processing function bodies,
  // all of the global values that may be referenced are available in our
  // ValueMap.
  for (Module::iterator I = SrcM->begin(), E = SrcM->end(); I != E; ++I)
    if (linkFunctionProto(I))
      return true;

  // If there were any aliases, link them now.
  for (Module::alias_iterator I = SrcM->alias_begin(),
       E = SrcM->alias_end(); I != E; ++I)
    if (linkAliasProto(I))
      return true;

  for (unsigned i = 0, e = AppendingVars.size(); i != e; ++i)
    linkAppendingVarInit(AppendingVars[i]);
  
  // Update the initializers in the DstM module now that all globals that may
  // be referenced are in DstM.
  linkGlobalInits();

  // Link in the function bodies that are defined in the source module into
  // DstM.
  for (Module::iterator SF = SrcM->begin(), E = SrcM->end(); SF != E; ++SF) {
    // Skip if not linking from source.
    if (DoNotLinkFromSource.count(SF)) continue;
    
    // Skip if no body (function is external) or materialize.
    if (SF->isDeclaration()) {
      if (!SF->isMaterializable())
        continue;
      if (SF->Materialize(&ErrorMsg))
        return true;
    }
    
    linkFunctionBody(cast<Function>(ValueMap[SF]), SF);
  }

  // Resolve all uses of aliases with aliasees.
  linkAliasBodies();

  // Remap all of the named MDNodes in Src into the DstM module. We do this
//.........这里部分代码省略.........