C++ DISubprogram::getNode方法代码示例

// addSubprogram - Add subprgoram into SPs.
bool DebugInfoFinder::addSubprogram(DISubprogram SP) {
  if (SP.isNull())
    return false;

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

  SPs.push_back(SP.getNode());
  return true;
}

/// EmitFunctionStart - Constructs the debug code for entering a function -
/// "llvm.dbg.func.start."
void DebugInfo::EmitFunctionStart(tree FnDecl) {
  setCurrentLexicalBlock(FnDecl);
  DISubprogram SP = CreateSubprogramFromFnDecl(FnDecl);
  // Push function on region stack.
  RegionStack.push_back(WeakVH(SP.getNode()));
}

/// createStructType - Create StructType for struct or union or class.
DIType DebugInfo::createStructType(tree type) {

  // struct { a; b; ... z; }; | union { a; b; ... z; };
  unsigned Tag = TREE_CODE(type) == RECORD_TYPE ? DW_TAG_structure_type :
    DW_TAG_union_type;
  
  unsigned RunTimeLang = 0;
  if (TYPE_LANG_SPECIFIC (type)
      && lang_hooks.types.is_runtime_specific_type (type))
    {
      unsigned CULang = TheCU.getLanguage();
      switch (CULang) {
      case DW_LANG_ObjC_plus_plus :
        RunTimeLang = DW_LANG_ObjC_plus_plus;
        break;
      case DW_LANG_ObjC :
        RunTimeLang = DW_LANG_ObjC;
        break;
      case DW_LANG_C_plus_plus :
        RunTimeLang = DW_LANG_C_plus_plus;
        break;
      default:
        break;
      }
    }
    
  // Records and classes and unions can all be recursive.  To handle them,
  // we first generate a debug descriptor for the struct as a forward 
  // declaration. Then (if it is a definition) we go through and get debug 
  // info for all of its members.  Finally, we create a descriptor for the
  // complete type (which may refer to the forward decl if the struct is 
  // recursive) and replace all  uses of the forward declaration with the 
  // final definition. 
  expanded_location Loc = GetNodeLocation(TREE_CHAIN(type), false);
  // FIXME: findRegion() is not able to find context all the time. This
  // means when type names in different context match then FwdDecl is
  // reused because MDNodes are uniqued. To avoid this, use type context
  /// also while creating FwdDecl for now.
  std::string FwdName;
  if (TYPE_CONTEXT(type)) {
    StringRef TypeContextName = GetNodeName(TYPE_CONTEXT(type));
    if (!TypeContextName.empty())
      FwdName = TypeContextName;
  }
  StringRef TypeName = GetNodeName(type);
  if (!TypeName.empty())
    FwdName = FwdName + TypeName.data();
  unsigned SFlags = 0;
  if (TYPE_BLOCK_IMPL_STRUCT(type))
    SFlags |= llvm::DIType::FlagAppleBlock;
  if (type_is_block_byref_struct(type))
    SFlags |= llvm::DIType::FlagBlockByrefStruct;
  DIDescriptor TyContext =  findRegion(TYPE_CONTEXT(type));

  // Check if this type is created while creating context information 
  // descriptor. 
  std::map<tree_node *, WeakVH >::iterator I = TypeCache.find(type);
  if (I != TypeCache.end())
    if (MDNode *TN = dyn_cast_or_null<MDNode>(I->second))
      return DIType(TN);
  
  llvm::DICompositeType FwdDecl =
    DebugFactory.CreateCompositeType(Tag, 
                                     TyContext,
                                     FwdName.c_str(),
                                     getOrCreateFile(Loc.file), 
                                     Loc.line, 
                                     0, 0, 0, SFlags | llvm::DIType::FlagFwdDecl,
                                     llvm::DIType(), llvm::DIArray(),
                                     RunTimeLang);
  
  // forward declaration, 
  if (TYPE_SIZE(type) == 0) 
    return FwdDecl;
  
  // Insert into the TypeCache so that recursive uses will find it.
  llvm::TrackingVH<llvm::MDNode> FwdDeclNode = FwdDecl.getNode();
  TypeCache[type] =  WeakVH(FwdDecl.getNode());

  // Push the struct on region stack.
  RegionStack.push_back(WeakVH(FwdDecl.getNode()));
  RegionMap[type] = WeakVH(FwdDecl.getNode());
  
  // Convert all the elements.
  llvm::SmallVector<llvm::DIDescriptor, 16> EltTys;
  
  if (tree binfo = TYPE_BINFO(type)) {
    VEC(tree,gc) *accesses = BINFO_BASE_ACCESSES (binfo);

    for (unsigned i = 0, e = BINFO_N_BASE_BINFOS(binfo); i != e; ++i) {
      tree BInfo = BINFO_BASE_BINFO(binfo, i);
      tree BInfoType = BINFO_TYPE (BInfo);
      DIType BaseClass = getOrCreateType(BInfoType);
      unsigned BFlags = 0;
      if (BINFO_VIRTUAL_P (BInfo))
        BFlags = llvm::DIType::FlagVirtual;
      if (accesses) {
        tree access = VEC_index (tree, accesses, i);
        if (access == access_protected_node)
//.........这里部分代码省略.........

/// CreateSubprogramFromFnDecl - Constructs the debug code for
/// entering a function - "llvm.dbg.func.start."
DISubprogram DebugInfo::CreateSubprogramFromFnDecl(tree FnDecl) {
  DISubprogram SPDecl;
  bool SPDeclIsSet = false;
  // True if we're currently generating LLVM for this function.
  bool definition = llvm_set_decl_p(FnDecl);
  DIType FNType = getOrCreateType(TREE_TYPE(FnDecl));

  std::map<tree_node *, WeakVH >::iterator I = SPCache.find(FnDecl);
  if (I != SPCache.end()) {
    SPDecl = DISubprogram(cast<MDNode>(I->second));
    SPDeclIsSet = true;
    // If we've already created the defining instance, OR this
    // invocation won't create the defining instance, return what we
    // already have.
    if (SPDecl.isDefinition() || !definition)
      return SPDecl;
  }

  bool ArtificialFnWithAbstractOrigin = false;
  // If this artificial function has abstract origin then put this function
  // at module scope. The abstract copy will be placed in appropriate region.
  if (DECL_ARTIFICIAL (FnDecl)
      && DECL_ABSTRACT_ORIGIN (FnDecl)
      && DECL_ABSTRACT_ORIGIN (FnDecl) != FnDecl)
    ArtificialFnWithAbstractOrigin = true;

  DIDescriptor SPContext = ArtificialFnWithAbstractOrigin ?
    getOrCreateFile(main_input_filename) :
    findRegion (DECL_CONTEXT(FnDecl));

  // Declare block_invoke functions at file scope for GDB.
  if (BLOCK_SYNTHESIZED_FUNC(FnDecl))
    SPContext = findRegion(NULL_TREE);

  // Creating context may have triggered creation of this SP descriptor. So
  // check the cache again.
  if (!SPDeclIsSet) {
    I = SPCache.find(FnDecl);
    if (I != SPCache.end()) {
      SPDecl = DISubprogram(cast<MDNode>(I->second));
      DISubprogram SP = 
        DebugFactory.CreateSubprogramDefinition(SPDecl);
      SPDecl.getNode()->replaceAllUsesWith(SP.getNode());

      // Push function on region stack.
      RegionStack.push_back(WeakVH(SP.getNode()));
      RegionMap[FnDecl] = WeakVH(SP.getNode());
      return SP;
    }
  }
  // Gather location information.
  expanded_location Loc = GetNodeLocation(FnDecl, false);
  // If the name isn't public, omit the linkage name.  Adding a
  // linkage name to a class method can confuse GDB.
  StringRef LinkageName = TREE_PUBLIC(FnDecl) ?
    getLinkageName(FnDecl) : StringRef();

  unsigned lineno = LOCATION_LINE(Loc);
  if (isCopyOrDestroyHelper(FnDecl))
    lineno = 0;

  unsigned Virtuality = 0;
  unsigned VIndex = 0;
  DIType ContainingType;
  if (DECL_VINDEX (FnDecl)) {
    if (host_integerp (DECL_VINDEX (FnDecl), 0))
      VIndex = tree_low_cst (DECL_VINDEX (FnDecl), 0);
    Virtuality = dwarf::DW_VIRTUALITY_virtual;
    ContainingType = getOrCreateType(DECL_CONTEXT (FnDecl));
  }

  StringRef FnName = getFunctionName(FnDecl);
  // If the Function * hasn't been created yet, use a bogus value for
  // the debug internal linkage bit.
  bool hasInternalLinkage = true;
  Function *Fn = 0;
  if (GET_DECL_LLVM_INDEX(FnDecl)) {
    Fn = cast<Function>DECL_LLVM(FnDecl);
    if (Fn)
      hasInternalLinkage = Fn->hasInternalLinkage();
  }
  DISubprogram SP = 
    DebugFactory.CreateSubprogram(SPContext,
                                  FnName, FnName,
                                  LinkageName,
                                  getOrCreateFile(Loc.file), lineno,
                                  FNType,
                                  hasInternalLinkage,
                                  definition,
                                  Virtuality, VIndex, ContainingType,
                                  DECL_ARTIFICIAL (FnDecl), optimize,
                                  Fn);

  SPCache[FnDecl] = WeakVH(SP.getNode());
  RegionMap[FnDecl] = WeakVH(SP.getNode());
  if (SPDeclIsSet && SPDecl.getNode() != SP.getNode())
    SPDecl.getNode()->replaceAllUsesWith(SP.getNode());
  return SP;
//.........这里部分代码省略.........