C++ DIType类代码示例

/// addGlobalType - Add a new global type to the compile unit.
///
void CompileUnit::addGlobalType(DIType Ty) {
  DIDescriptor Context = Ty.getContext();
  if (Ty.isCompositeType() && !Ty.getName().empty() && !Ty.isForwardDecl() 
      && (Context.isCompileUnit() || Context.isFile() || Context.isNameSpace()))
    if (DIEEntry *Entry = getDIEEntry(Ty))
      GlobalTypes[Ty.getName()] = Entry->getEntry();
}

DICompositeType DIBuilder::createStructType(DIDescriptor Context,
                                            StringRef Name, DIFile File,
                                            unsigned LineNumber,
                                            uint64_t SizeInBits,
                                            uint64_t AlignInBits,
                                            unsigned Flags, DIType DerivedFrom,
                                            DIArray Elements,
                                            unsigned RunTimeLang,
                                            DIType VTableHolder,
                                            StringRef UniqueIdentifier) {
 // TAG_structure_type is encoded in DICompositeType format.
  Value *Elts[] = {
      HeaderBuilder::get(dwarf::DW_TAG_structure_type)
          .concat(Name)
          .concat(LineNumber)
          .concat(SizeInBits)
          .concat(AlignInBits)
          .concat(0)
          .concat(Flags)
          .concat(RunTimeLang)
          .get(VMContext),
      File.getFileNode(), DIScope(getNonCompileUnitScope(Context)).getRef(),
      DerivedFrom.getRef(), Elements, VTableHolder.getRef(), nullptr,
      UniqueIdentifier.empty() ? nullptr
                               : MDString::get(VMContext, UniqueIdentifier)};
  DICompositeType R(MDNode::get(VMContext, Elts));
  assert(R.isCompositeType() &&
         "createStructType should return a DICompositeType");
  if (!UniqueIdentifier.empty())
    retainType(R);
  return R;
}

/// EmitDeclare - Constructs the debug code for allocation of a new variable.
/// region - "llvm.dbg.declare."
void DebugInfo::EmitDeclare(tree decl, unsigned Tag, const char *Name,
                            tree type, Value *AI, LLVMBuilder &Builder) {

  // Ignore compiler generated temporaries.
  if (DECL_IGNORED_P(decl))
    return;

  assert(!RegionStack.empty() && "Region stack mismatch, stack empty!");

  expanded_location Loc = GetNodeLocation(decl, false);

  // Construct variable.
  DIScope VarScope = DIScope(cast<MDNode>(RegionStack.back()));
  DIType Ty = getOrCreateType(type);
  if (DECL_ARTIFICIAL (decl))
      Ty = DebugFactory.CreateArtificialType(Ty);
  // If type info is not available then do not emit debug info for this var.
  if (!Ty.getNode())
    return;
  llvm::DIVariable D =
    DebugFactory.CreateVariable(Tag, VarScope,
                                Name, getOrCreateFile(Loc.file),
                                Loc.line, Ty, optimize);

  // Insert an llvm.dbg.declare into the current block.
  Instruction *Call = DebugFactory.InsertDeclare(AI, D, 
                                                 Builder.GetInsertBlock());
  
  Call->setDebugLoc(DebugLoc::get(Loc.line, 0, VarScope.getNode()));
}

void DebugInfoFinder::processType(DIType DT) {
  if (!addType(DT))
    return;
  processScope(DT.getContext().resolve(TypeIdentifierMap));
  if (DT.isCompositeType()) {
    DICompositeType DCT(DT);
    processType(DCT.getTypeDerivedFrom().resolve(TypeIdentifierMap));
    if (DT.isSubroutineType()) {
      DITypeArray DTA = DISubroutineType(DT).getTypeArray();
      for (unsigned i = 0, e = DTA.getNumElements(); i != e; ++i)
        processType(DTA.getElement(i).resolve(TypeIdentifierMap));
      return;
    }
    DIArray DA = DCT.getElements();
    for (unsigned i = 0, e = DA.getNumElements(); i != e; ++i) {
      DIDescriptor D = DA.getElement(i);
      if (D.isType())
        processType(DIType(D));
      else if (D.isSubprogram())
        processSubprogram(DISubprogram(D));
    }
  } else if (DT.isDerivedType()) {
    DIDerivedType DDT(DT);
    processType(DDT.getTypeDerivedFrom().resolve(TypeIdentifierMap));
  }
}

/// If this type is derived from a base type then return base type size.
uint64_t DebugHandlerBase::getBaseTypeSize(const DITypeRef TyRef) {
  DIType *Ty = TyRef.resolve();
  assert(Ty);
  DIDerivedType *DDTy = dyn_cast<DIDerivedType>(Ty);
  if (!DDTy)
    return Ty->getSizeInBits();

  unsigned Tag = DDTy->getTag();

  if (Tag != dwarf::DW_TAG_member && Tag != dwarf::DW_TAG_typedef &&
      Tag != dwarf::DW_TAG_const_type && Tag != dwarf::DW_TAG_volatile_type &&
      Tag != dwarf::DW_TAG_restrict_type && Tag != dwarf::DW_TAG_atomic_type)
    return DDTy->getSizeInBits();

  DIType *BaseType = DDTy->getBaseType().resolve();

  assert(BaseType && "Unexpected invalid base type");

  // If this is a derived type, go ahead and get the base type, unless it's a
  // reference then it's just the size of the field. Pointer types have no need
  // of this since they're a different type of qualification on the type.
  if (BaseType->getTag() == dwarf::DW_TAG_reference_type ||
      BaseType->getTag() == dwarf::DW_TAG_rvalue_reference_type)
    return Ty->getSizeInBits();

  return getBaseTypeSize(BaseType);
}

DICompositeType DIBuilder::createClassType(DIDescriptor Context, StringRef Name,
                                           DIFile File, unsigned LineNumber,
                                           uint64_t SizeInBits,
                                           uint64_t AlignInBits,
                                           uint64_t OffsetInBits,
                                           unsigned Flags, DIType DerivedFrom,
                                           DIArray Elements,
                                           DIType VTableHolder,
                                           MDNode *TemplateParams,
                                           StringRef UniqueIdentifier) {
  assert((!Context || Context.isScope() || Context.isType()) &&
         "createClassType should be called with a valid Context");
  // TAG_class_type is encoded in DICompositeType format.
  Value *Elts[] = {
      HeaderBuilder::get(dwarf::DW_TAG_class_type)
          .concat(Name)
          .concat(LineNumber)
          .concat(SizeInBits)
          .concat(AlignInBits)
          .concat(OffsetInBits)
          .concat(Flags)
          .concat(0)
          .get(VMContext),
      File.getFileNode(), DIScope(getNonCompileUnitScope(Context)).getRef(),
      DerivedFrom.getRef(), Elements, VTableHolder.getRef(), TemplateParams,
      UniqueIdentifier.empty() ? nullptr
                               : MDString::get(VMContext, UniqueIdentifier)};
  DICompositeType R(MDNode::get(VMContext, Elts));
  assert(R.isCompositeType() &&
         "createClassType should return a DICompositeType");
  if (!UniqueIdentifier.empty())
    retainType(R);
  return R;
}

/// getOriginalTypeSize - If this type is derived from a base type then
/// return base type size.
uint64_t DIDerivedType::getOriginalTypeSize() const {
  unsigned Tag = getTag();

  if (Tag == dwarf::DW_TAG_member || Tag == dwarf::DW_TAG_typedef ||
      Tag == dwarf::DW_TAG_const_type || Tag == dwarf::DW_TAG_volatile_type ||
      Tag == dwarf::DW_TAG_restrict_type) {
    DIType BaseType = getTypeDerivedFrom();
    // If this type is not derived from any type then take conservative
    // approach.
    if (!BaseType.isValid())
      return getSizeInBits();
    // If this is a derived type, go ahead and get the base type, unless
    // it's a reference then it's just the size of the field. Pointer types
    // have no need of this since they're a different type of qualification
    // on the type.
    if (BaseType.getTag() == dwarf::DW_TAG_reference_type)
      return getSizeInBits();
    else if (BaseType.isDerivedType())
      return DIDerivedType(BaseType).getOriginalTypeSize();
    else
      return BaseType.getSizeInBits();
  }

  return getSizeInBits();
}

/// createVarinatType - Create variant type or return MainTy.
DIType DebugInfo::createVariantType(tree type, DIType MainTy) {
  
  DIType Ty;
  if (tree TyDef = TYPE_NAME(type)) {
      std::map<tree_node *, WeakVH >::iterator I = TypeCache.find(TyDef);
      if (I != TypeCache.end())
        if (Value *M = I->second)
          return DIType(cast<MDNode>(M));
    if (TREE_CODE(TyDef) == TYPE_DECL &&  DECL_ORIGINAL_TYPE(TyDef)) {
      expanded_location TypeDefLoc = GetNodeLocation(TyDef);
      Ty = DebugFactory.CreateDerivedType(DW_TAG_typedef, 
                                          findRegion(DECL_CONTEXT(TyDef)),
                                          GetNodeName(TyDef), 
                                          getOrCreateFile(TypeDefLoc.file),
                                          TypeDefLoc.line,
                                          0 /*size*/,
                                          0 /*align*/,
                                          0 /*offset */, 
                                          0 /*flags*/, 
                                          MainTy);
      TypeCache[TyDef] = WeakVH(Ty.getNode());
      return Ty;
    }
  }

  if (TYPE_VOLATILE(type)) {
    Ty = DebugFactory.CreateDerivedType(DW_TAG_volatile_type, 
                                        findRegion(TYPE_CONTEXT(type)), 
                                        StringRef(),
                                        getOrCreateFile(main_input_filename),
                                        0 /*line no*/, 
                                        NodeSizeInBits(type),
                                        NodeAlignInBits(type),
                                        0 /*offset */, 
                                        0 /* flags */, 
                                        MainTy);
    MainTy = Ty;
  }

  if (TYPE_READONLY(type)) 
    Ty =  DebugFactory.CreateDerivedType(DW_TAG_const_type, 
                                         findRegion(TYPE_CONTEXT(type)), 
                                         StringRef(),
                                         getOrCreateFile(main_input_filename),
                                         0 /*line no*/, 
                                         NodeSizeInBits(type),
                                         NodeAlignInBits(type),
                                         0 /*offset */, 
                                         0 /* flags */, 
                                         MainTy);
  
  if (TYPE_VOLATILE(type) || TYPE_READONLY(type)) {
    TypeCache[type] = WeakVH(Ty.getNode());
    return Ty;
  }

  // If, for some reason, main type varaint type is seen then use it.
  return MainTy;
}

/// getDICompositeType - Find underlying composite type.
DICompositeType llvm::getDICompositeType(DIType T) {
  if (T.isCompositeType())
    return DICompositeType(T);

  if (T.isDerivedType())
    return getDICompositeType(DIDerivedType(T).getTypeDerivedFrom());

  return DICompositeType();
}

void DIEItem::FormatDIType(wxTextOutputStream& out, DIType type) const {
  if (type.isCompositeType()) {
    DICompositeType diCompType(type);
    if (!type.getName().empty()) {
      out << toWxStr(type.getName());
    } else {
      out << _("?Implement unnamed composite");
      // TODO: Implement:
      // DW_TAG_array_type
      // DW_TAG_enumeration_type
      // DW_TAG_structure_type
      // DW_TAG_union_type
      // DW_TAG_vector_type
      // DW_TAG_subroutine_type
      // DW_TAG_inheritance
    }
  } else if (type.isDerivedType()) {
    DIDerivedType diDerivedType(type);
    DIType diBase = diDerivedType.getTypeDerivedFrom();
    switch (diDerivedType.getTag()) {
      case dwarf::DW_TAG_inheritance:
        FormatDIType(out, diBase);
        break;

      case dwarf::DW_TAG_pointer_type:
        FormatDIType(out, diBase);
        out << _("*");
        break;

      case dwarf::DW_TAG_array_type:
        FormatDIType(out, diBase);
        // TODO: Get the array size, use LLVM array notation.
        out << _("[]");
        break;

      case dwarf::DW_TAG_member:
        out << toWxStr(diDerivedType.getName());
        break;

      case dwarf::DW_TAG_reference_type:
      case dwarf::DW_TAG_const_type:
      case dwarf::DW_TAG_volatile_type:
      case dwarf::DW_TAG_restrict_type:
      case dwarf::DW_TAG_typedef:
        // TODO: Implement
        break;
    }
  } else if (type.isBasicType()) {
    DIBasicType diBasicType(type);
    const char * encodingName =
        dwarf::AttributeEncodingString(diBasicType.getEncoding());
    if (encodingName != NULL) {
      out << toWxStr(encodingName);
    }
  }
}

/// Verify - Verify that an ObjC property is well formed.
bool DIObjCProperty::Verify() const {
  if (!isObjCProperty())
    return false;

  DIType Ty = getType();
  if (!Ty.Verify()) return false;

  // Don't worry about the rest of the strings for now.
  return DbgNode->getNumOperands() == 8;
}

/// addType - Add type into Tys.
bool DebugInfoFinder::addType(DIType DT) {
  if (DT.isNull())
    return false;

  if (!NodesSeen.insert(DT.getNode()))
    return false;

  TYs.push_back(DT.getNode());
  return true;
}

/// Verify - Verify that an ObjC property is well formed.
bool DIObjCProperty::Verify() const {
  if (!DbgNode)
    return false;
  unsigned Tag = getTag();
  if (Tag != dwarf::DW_TAG_APPLE_property) return false;
  DIType Ty = getType();
  if (!Ty.Verify()) return false;

  // Don't worry about the rest of the strings for now.
  return true;
}

/// \brief Return the size reported by the variable's type.
unsigned DIVariable::getSizeInBits(const DITypeIdentifierMap &Map) {
  DIType Ty = getType().resolve(Map);
  // Follow derived types until we reach a type that
  // reports back a size.
  while (Ty.isDerivedType() && !Ty.getSizeInBits()) {
    DIDerivedType DT(&*Ty);
    Ty = DT.getTypeDerivedFrom().resolve(Map);
  }
  assert(Ty.getSizeInBits() && "type with size 0");
  return Ty.getSizeInBits();
}

static bool getLocationInfo(const Value *V, std::string &DisplayName,
                            std::string &Type, unsigned &LineNo,
                            std::string &File, std::string &Dir) {
  DICompileUnit Unit;
  DIType TypeD;

  if (GlobalVariable *GV = dyn_cast<GlobalVariable>(const_cast<Value*>(V))) {
    Value *DIGV = findDbgGlobalDeclare(GV);
    if (!DIGV) return false;
    DIGlobalVariable Var(cast<MDNode>(DIGV));

    StringRef D = Var.getDisplayName();
    if (!D.empty())
      DisplayName = D;
    LineNo = Var.getLineNumber();
    Unit = Var.getCompileUnit();
    TypeD = Var.getType();
  } else if (Function *F = dyn_cast<Function>(const_cast<Value*>(V))){
    Value *DIF = findDbgSubprogramDeclare(F);
    if (!DIF) return false;
    DISubprogram Var(cast<MDNode>(DIF));

    StringRef D = Var.getDisplayName();
    if (!D.empty())
      DisplayName = D;
    LineNo = Var.getLineNumber();
    Unit = Var.getCompileUnit();
    TypeD = Var.getType();
  } else {
    const DbgDeclareInst *DDI = findDbgDeclare(V);
    if (!DDI) return false;
    DIVariable Var(cast<MDNode>(DDI->getVariable()));

    StringRef D = Var.getName();
    if (!D.empty())
      DisplayName = D;
    LineNo = Var.getLineNumber();
    Unit = Var.getCompileUnit();
    TypeD = Var.getType();
  }

  StringRef T = TypeD.getName();
  if (!T.empty())
    Type = T;
  StringRef F = Unit.getFilename();
  if (!F.empty())
    File = F;
  StringRef D = Unit.getDirectory();
  if (!D.empty())
    Dir = D;
  return true;
}