C++ DISubprogram::getUnit方法代码示例

// Clone OldFunc into NewFunc, transforming the old arguments into references to
// VMap values.
//
void llvm::CloneFunctionInto(Function *NewFunc, const Function *OldFunc,
                             ValueToValueMapTy &VMap,
                             bool ModuleLevelChanges,
                             SmallVectorImpl<ReturnInst*> &Returns,
                             const char *NameSuffix, ClonedCodeInfo *CodeInfo,
                             ValueMapTypeRemapper *TypeMapper,
                             ValueMaterializer *Materializer) {
  assert(NameSuffix && "NameSuffix cannot be null!");

#ifndef NDEBUG
  for (const Argument &I : OldFunc->args())
    assert(VMap.count(&I) && "No mapping from source argument specified!");
#endif

  // Copy all attributes other than those stored in the AttributeList.  We need
  // to remap the parameter indices of the AttributeList.
  AttributeList NewAttrs = NewFunc->getAttributes();
  NewFunc->copyAttributesFrom(OldFunc);
  NewFunc->setAttributes(NewAttrs);

  // Fix up the personality function that got copied over.
  if (OldFunc->hasPersonalityFn())
    NewFunc->setPersonalityFn(
        MapValue(OldFunc->getPersonalityFn(), VMap,
                 ModuleLevelChanges ? RF_None : RF_NoModuleLevelChanges,
                 TypeMapper, Materializer));

  SmallVector<AttributeSet, 4> NewArgAttrs(NewFunc->arg_size());
  AttributeList OldAttrs = OldFunc->getAttributes();

  // Clone any argument attributes that are present in the VMap.
  for (const Argument &OldArg : OldFunc->args()) {
    if (Argument *NewArg = dyn_cast<Argument>(VMap[&OldArg])) {
      NewArgAttrs[NewArg->getArgNo()] =
          OldAttrs.getParamAttributes(OldArg.getArgNo());
    }
  }

  NewFunc->setAttributes(
      AttributeList::get(NewFunc->getContext(), OldAttrs.getFnAttributes(),
                         OldAttrs.getRetAttributes(), NewArgAttrs));

  bool MustCloneSP =
      OldFunc->getParent() && OldFunc->getParent() == NewFunc->getParent();
  DISubprogram *SP = OldFunc->getSubprogram();
  if (SP) {
    assert(!MustCloneSP || ModuleLevelChanges);
    // Add mappings for some DebugInfo nodes that we don't want duplicated
    // even if they're distinct.
    auto &MD = VMap.MD();
    MD[SP->getUnit()].reset(SP->getUnit());
    MD[SP->getType()].reset(SP->getType());
    MD[SP->getFile()].reset(SP->getFile());
    // If we're not cloning into the same module, no need to clone the
    // subprogram
    if (!MustCloneSP)
      MD[SP].reset(SP);
  }

  SmallVector<std::pair<unsigned, MDNode *>, 1> MDs;
  OldFunc->getAllMetadata(MDs);
  for (auto MD : MDs) {
    NewFunc->addMetadata(
        MD.first,
        *MapMetadata(MD.second, VMap,
                     ModuleLevelChanges ? RF_None : RF_NoModuleLevelChanges,
                     TypeMapper, Materializer));
  }

  // When we remap instructions, we want to avoid duplicating inlined
  // DISubprograms, so record all subprograms we find as we duplicate
  // instructions and then freeze them in the MD map.
  DebugInfoFinder DIFinder;

  // Loop over all of the basic blocks in the function, cloning them as
  // appropriate.  Note that we save BE this way in order to handle cloning of
  // recursive functions into themselves.
  //
  for (Function::const_iterator BI = OldFunc->begin(), BE = OldFunc->end();
       BI != BE; ++BI) {
    const BasicBlock &BB = *BI;

    // Create a new basic block and copy instructions into it!
    BasicBlock *CBB = CloneBasicBlock(&BB, VMap, NameSuffix, NewFunc, CodeInfo,
                                      SP ? &DIFinder : nullptr);

    // Add basic block mapping.
    VMap[&BB] = CBB;

    // It is only legal to clone a function if a block address within that
    // function is never referenced outside of the function.  Given that, we
    // want to map block addresses from the old function to block addresses in
    // the clone. (This is different from the generic ValueMapper
    // implementation, which generates an invalid blockaddress when
    // cloning a function.)
    if (BB.hasAddressTaken()) {
      Constant *OldBBAddr = BlockAddress::get(const_cast<Function*>(OldFunc),
//.........这里部分代码省略.........