Exemple #1
0
GlobalValue *IRLinker::copyGlobalValueProto(const GlobalValue *SGV,
                                            bool ForDefinition) {
  GlobalValue *NewGV;
  if (auto *SGVar = dyn_cast<GlobalVariable>(SGV)) {
    NewGV = copyGlobalVariableProto(SGVar);
  } else if (auto *SF = dyn_cast<Function>(SGV)) {
    NewGV = copyFunctionProto(SF);
  } else {
    if (ForDefinition)
      NewGV = copyGlobalAliasProto(cast<GlobalAlias>(SGV));
    else
      NewGV = new GlobalVariable(
          DstM, TypeMap.get(SGV->getType()->getElementType()),
          /*isConstant*/ false, GlobalValue::ExternalLinkage,
          /*init*/ nullptr, SGV->getName(),
          /*insertbefore*/ nullptr, SGV->getThreadLocalMode(),
          SGV->getType()->getAddressSpace());
  }

  if (ForDefinition)
    NewGV->setLinkage(SGV->getLinkage());
  else if (SGV->hasExternalWeakLinkage() || SGV->hasWeakLinkage() ||
           SGV->hasLinkOnceLinkage())
    NewGV->setLinkage(GlobalValue::ExternalWeakLinkage);

  NewGV->copyAttributesFrom(SGV);
  return NewGV;
}
static void convertAliasToDeclaration(GlobalAlias &GA, Module &M) {
  GlobalValue *GVal = GA.getBaseObject();
  GlobalValue *NewGV;
  if (auto *GVar = dyn_cast<GlobalVariable>(GVal)) {
    GlobalVariable *NewGVar = new GlobalVariable(
        M, GVar->getType()->getElementType(), GVar->isConstant(),
        GVar->getLinkage(), /*init*/ nullptr, GA.getName(), GVar,
        GVar->getThreadLocalMode(), GVar->getType()->getAddressSpace());
    NewGV = NewGVar;
    NewGV->copyAttributesFrom(GVar);
  } else {
    auto *F = dyn_cast<Function>(GVal);
    assert(F);
    Function *NewF = Function::Create(F->getFunctionType(), F->getLinkage(),
                                      GA.getName(), &M);
    NewGV = NewF;
    NewGV->copyAttributesFrom(F);
  }
  GA.replaceAllUsesWith(ConstantExpr::getBitCast(NewGV, GA.getType()));
  GA.eraseFromParent();
}
Exemple #3
0
GlobalValue *IRLinker::copyGlobalValueProto(const GlobalValue *SGV,
                                            bool ForDefinition) {
  GlobalValue *NewGV;
  if (auto *SGVar = dyn_cast<GlobalVariable>(SGV)) {
    NewGV = copyGlobalVariableProto(SGVar);
  } else if (auto *SF = dyn_cast<Function>(SGV)) {
    NewGV = copyFunctionProto(SF);
  } else {
    if (ForDefinition)
      NewGV = copyGlobalAliasProto(cast<GlobalAlias>(SGV));
    else
      NewGV = new GlobalVariable(
          DstM, TypeMap.get(SGV->getValueType()),
          /*isConstant*/ false, GlobalValue::ExternalLinkage,
          /*init*/ nullptr, SGV->getName(),
          /*insertbefore*/ nullptr, SGV->getThreadLocalMode(),
          SGV->getType()->getAddressSpace());
  }

  if (ForDefinition)
    NewGV->setLinkage(SGV->getLinkage());
  else if (SGV->hasExternalWeakLinkage())
    NewGV->setLinkage(GlobalValue::ExternalWeakLinkage);

  NewGV->copyAttributesFrom(SGV);

  if (auto *NewGO = dyn_cast<GlobalObject>(NewGV)) {
    // Metadata for global variables and function declarations is copied eagerly.
    if (isa<GlobalVariable>(SGV) || SGV->isDeclaration())
      NewGO->copyMetadata(cast<GlobalObject>(SGV), 0);
  }

  // Remove these copied constants in case this stays a declaration, since
  // they point to the source module. If the def is linked the values will
  // be mapped in during linkFunctionBody.
  if (auto *NewF = dyn_cast<Function>(NewGV)) {
    NewF->setPersonalityFn(nullptr);
    NewF->setPrefixData(nullptr);
    NewF->setPrologueData(nullptr);
  }

  return NewGV;
}