C++ global_iterator::setName方法代码示例

/// StripSymbolNames - Strip symbol names.
static bool StripSymbolNames(Module &M, bool PreserveDbgInfo) {

  SmallPtrSet<const GlobalValue*, 8> llvmUsedValues;
  findUsedValues(M.getGlobalVariable("llvm.used"), llvmUsedValues);
  findUsedValues(M.getGlobalVariable("llvm.compiler.used"), llvmUsedValues);

  for (Module::global_iterator I = M.global_begin(), E = M.global_end();
       I != E; ++I) {
    if (I->hasLocalLinkage() && llvmUsedValues.count(I) == 0)
      if (!PreserveDbgInfo || !I->getName().startswith("llvm.dbg"))
        I->setName("");     // Internal symbols can't participate in linkage
  }
  
  for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
    if (I->hasLocalLinkage() && llvmUsedValues.count(I) == 0)
      if (!PreserveDbgInfo || !I->getName().startswith("llvm.dbg"))
        I->setName("");     // Internal symbols can't participate in linkage
    StripSymtab(I->getValueSymbolTable(), PreserveDbgInfo);
  }
  
  // Remove all names from types.
  StripTypeSymtab(M.getTypeSymbolTable(), PreserveDbgInfo);

  return true;
}

/// DisambiguateGlobalSymbols - Give anonymous global values names.
///
static void DisambiguateGlobalSymbols(Module *M) {
  for (Module::global_iterator I = M->global_begin(), E = M->global_end();
       I != E; ++I)
    if (!I->hasName())
      I->setName("anon_global");
  for (Module::iterator I = M->begin(), E = M->end(); I != E; ++I)
    if (!I->hasName())
      I->setName("anon_fn");
}

/// SplitFunctionsOutOfModule - Given a module and a list of functions in the
/// module, split the functions OUT of the specified module, and place them in
/// the new module.
Module *
llvm::SplitFunctionsOutOfModule(Module *M,
                                const std::vector<Function*> &F,
                                DenseMap<const Value*, Value*> &ValueMap) {
  // Make sure functions & globals are all external so that linkage
  // between the two modules will work.
  for (Module::iterator I = M->begin(), E = M->end(); I != E; ++I)
    I->setLinkage(GlobalValue::ExternalLinkage);
  for (Module::global_iterator I = M->global_begin(), E = M->global_end();
       I != E; ++I) {
    if (I->hasName() && I->getName()[0] == '\01')
      I->setName(I->getName().substr(1));
    I->setLinkage(GlobalValue::ExternalLinkage);
  }

  DenseMap<const Value*, Value*> NewValueMap;
  Module *New = CloneModule(M, NewValueMap);

  // Make sure global initializers exist only in the safe module (CBE->.so)
  for (Module::global_iterator I = New->global_begin(), E = New->global_end();
       I != E; ++I)
    I->setInitializer(0);  // Delete the initializer to make it external

  // Remove the Test functions from the Safe module
  std::set<Function *> TestFunctions;
  for (unsigned i = 0, e = F.size(); i != e; ++i) {
    Function *TNOF = cast<Function>(ValueMap[F[i]]);
    DEBUG(errs() << "Removing function ");
    DEBUG(WriteAsOperand(errs(), TNOF, false));
    DEBUG(errs() << "\n");
    TestFunctions.insert(cast<Function>(NewValueMap[TNOF]));
    DeleteFunctionBody(TNOF);       // Function is now external in this module!
  }

  
  // Remove the Safe functions from the Test module
  for (Module::iterator I = New->begin(), E = New->end(); I != E; ++I)
    if (!TestFunctions.count(I))
      DeleteFunctionBody(I);
  

  // Make sure that there is a global ctor/dtor array in both halves of the
  // module if they both have static ctor/dtor functions.
  SplitStaticCtorDtor("llvm.global_ctors", M, New, NewValueMap);
  SplitStaticCtorDtor("llvm.global_dtors", M, New, NewValueMap);
  
  return New;
}

/// DisambiguateGlobalSymbols - Mangle symbols to guarantee uniqueness by
/// modifying predominantly internal symbols rather than external ones.
///
static void DisambiguateGlobalSymbols(Module *M) {
  // Try not to cause collisions by minimizing chances of renaming an
  // already-external symbol, so take in external globals and functions as-is.
  // The code should work correctly without disambiguation (assuming the same
  // mangler is used by the two code generators), but having symbols with the
  // same name causes warnings to be emitted by the code generator.
  Mangler Mang(*M);
  // Agree with the CBE on symbol naming
  Mang.markCharUnacceptable('.');
  Mang.setPreserveAsmNames(true);
  for (Module::global_iterator I = M->global_begin(), E = M->global_end();
       I != E; ++I)
    I->setName(Mang.getValueName(I));
  for (Module::iterator  I = M->begin(),  E = M->end();  I != E; ++I)
    I->setName(Mang.getValueName(I));
}

/// DisambiguateGlobalSymbols - Mangle symbols to guarantee uniqueness by
/// modifying predominantly internal symbols rather than external ones.
///
static void DisambiguateGlobalSymbols(Module *M) {
  // Try not to cause collisions by minimizing chances of renaming an
  // already-external symbol, so take in external globals and functions as-is.
  // The code should work correctly without disambiguation (assuming the same
  // mangler is used by the two code generators), but having symbols with the
  // same name causes warnings to be emitted by the code generator.
  Mangler Mang(*M);
  // Agree with the CBE on symbol naming
  Mang.markCharUnacceptable('.');
  for (Module::global_iterator I = M->global_begin(), E = M->global_end();
       I != E; ++I) {
    // Don't mangle asm names.
    if (!I->hasName() || I->getName()[0] != 1)
      I->setName(Mang.getMangledName(I));
  }
  for (Module::iterator I = M->begin(), E = M->end(); I != E; ++I) {
    // Don't mangle asm names or intrinsics.
    if ((!I->hasName() || I->getName()[0] != 1) &&
        I->getIntrinsicID() == 0)
      I->setName(Mang.getMangledName(I));
  }
}

static int runCompilePasses(Module *ModuleRef,
                            unsigned ModuleIndex,
                            ThreadedFunctionQueue *FuncQueue,
                            const Triple &TheTriple,
                            TargetMachine &Target,
                            StringRef ProgramName,
                            raw_pwrite_stream &OS){
  PNaClABIErrorReporter ABIErrorReporter;

  if (SplitModuleCount > 1 || ExternalizeAll) {
    // Add function and global names, and give them external linkage.
    // This relies on LLVM's consistent auto-generation of names, we could
    // maybe do our own in case something changes there.
    for (Function &F : *ModuleRef) {
      if (!F.hasName())
        F.setName("Function");
      if (F.hasInternalLinkage())
        F.setLinkage(GlobalValue::ExternalLinkage);
    }
    for (Module::global_iterator GI = ModuleRef->global_begin(),
         GE = ModuleRef->global_end();
         GI != GE; ++GI) {
      if (!GI->hasName())
        GI->setName("Global");
      if (GI->hasInternalLinkage())
        GI->setLinkage(GlobalValue::ExternalLinkage);
    }
    if (ModuleIndex > 0) {
      // Remove the initializers for all global variables, turning them into
      // declarations.
      for (Module::global_iterator GI = ModuleRef->global_begin(),
          GE = ModuleRef->global_end();
          GI != GE; ++GI) {
        assert(GI->hasInitializer() && "Global variable missing initializer");
        Constant *Init = GI->getInitializer();
        GI->setInitializer(nullptr);
        if (Init->getNumUses() == 0)
          Init->destroyConstant();
      }
    }
  }

  // Make all non-weak symbols hidden for better code. We cannot do
  // this for weak symbols. The linker complains when some weak
  // symbols are not resolved.
  for (Function &F : *ModuleRef) {
    if (!F.isWeakForLinker() && !F.hasLocalLinkage())
      F.setVisibility(GlobalValue::HiddenVisibility);
  }
  for (Module::global_iterator GI = ModuleRef->global_begin(),
           GE = ModuleRef->global_end();
       GI != GE; ++GI) {
    if (!GI->isWeakForLinker() && !GI->hasLocalLinkage())
      GI->setVisibility(GlobalValue::HiddenVisibility);
  }

  // Build up all of the passes that we want to do to the module.
  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;
//.........这里部分代码省略.........

/// SplitFunctionsOutOfModule - Given a module and a list of functions in the
/// module, split the functions OUT of the specified module, and place them in
/// the new module.
Module *
llvm::SplitFunctionsOutOfModule(Module *M,
                                const std::vector<Function*> &F,
                                ValueToValueMapTy &VMap) {
  // Make sure functions & globals are all external so that linkage
  // between the two modules will work.
  for (Module::iterator I = M->begin(), E = M->end(); I != E; ++I)
    I->setLinkage(GlobalValue::ExternalLinkage);
  for (Module::global_iterator I = M->global_begin(), E = M->global_end();
       I != E; ++I) {
    if (I->hasName() && I->getName()[0] == '\01')
      I->setName(I->getName().substr(1));
    I->setLinkage(GlobalValue::ExternalLinkage);
  }

  ValueToValueMapTy NewVMap;
  Module *New = CloneModule(M, NewVMap);

  // Remove the Test functions from the Safe module
  std::set<Function *> TestFunctions;
  for (unsigned i = 0, e = F.size(); i != e; ++i) {
    Function *TNOF = cast<Function>(VMap[F[i]]);
    DEBUG(errs() << "Removing function ");
    DEBUG(WriteAsOperand(errs(), TNOF, false));
    DEBUG(errs() << "\n");
    TestFunctions.insert(cast<Function>(NewVMap[TNOF]));
    DeleteFunctionBody(TNOF);       // Function is now external in this module!
  }

  
  // Remove the Safe functions from the Test module
  for (Module::iterator I = New->begin(), E = New->end(); I != E; ++I)
    if (!TestFunctions.count(I))
      DeleteFunctionBody(I);
  

  // Try to split the global initializers evenly
  for (Module::global_iterator I = M->global_begin(), E = M->global_end();
       I != E; ++I) {
    GlobalVariable *GV = cast<GlobalVariable>(NewVMap[I]);
    if (Function *TestFn = globalInitUsesExternalBA(I)) {
      if (Function *SafeFn = globalInitUsesExternalBA(GV)) {
        errs() << "*** Error: when reducing functions, encountered "
                  "the global '";
        WriteAsOperand(errs(), GV, false);
        errs() << "' with an initializer that references blockaddresses "
                  "from safe function '" << SafeFn->getName()
               << "' and from test function '" << TestFn->getName() << "'.\n";
        exit(1);
      }
      I->setInitializer(0);  // Delete the initializer to make it external
    } else {
      // If we keep it in the safe module, then delete it in the test module
      GV->setInitializer(0);
    }
  }

  // Make sure that there is a global ctor/dtor array in both halves of the
  // module if they both have static ctor/dtor functions.
  SplitStaticCtorDtor("llvm.global_ctors", M, New, NewVMap);
  SplitStaticCtorDtor("llvm.global_dtors", M, New, NewVMap);
  
  return New;
}