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// Copyright 2006-2009 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/handles.h"
#include "src/zone.h"
namespace v8 {
namespace internal {
class FunctionLiteral;
class Isolate;
// FuncNameInferrer is a stateful class that is used to perform name
// inference for anonymous functions during static analysis of source code.
// Inference is performed in cases when an anonymous function is assigned
// to a variable or a property (see for examples.)
// The basic idea is that during parsing of LHSs of certain expressions
// (assignments, declarations, object literals) we collect name strings,
// and during parsing of the RHS, a function literal can be collected. After
// parsing the RHS we can infer a name for function literals that do not have
// a name.
class FuncNameInferrer : public ZoneObject {
FuncNameInferrer(Isolate* isolate, Zone* zone);
// Returns whether we have entered name collection state.
bool IsOpen() const { return !entries_stack_.is_empty(); }
// Pushes an enclosing the name of enclosing function onto names stack.
void PushEnclosingName(Handle<String> name);
// Enters name collection state.
void Enter() {
entries_stack_.Add(names_stack_.length(), zone());
// Pushes an encountered name onto names stack when in collection state.
void PushLiteralName(Handle<String> name);
void PushVariableName(Handle<String> name);
// Adds a function to infer name for.
void AddFunction(FunctionLiteral* func_to_infer) {
if (IsOpen()) {
funcs_to_infer_.Add(func_to_infer, zone());
void RemoveLastFunction() {
if (IsOpen() && !funcs_to_infer_.is_empty()) {
// Infers a function name and leaves names collection state.
void Infer() {
if (!funcs_to_infer_.is_empty()) {
// Leaves names collection state.
void Leave() {
if (entries_stack_.is_empty())
enum NameType {
struct Name {
Name(Handle<String> name, NameType type) : name(name), type(type) { }
Handle<String> name;
NameType type;
Isolate* isolate() { return isolate_; }
Zone* zone() const { return zone_; }
// Constructs a full name in dotted notation from gathered names.
Handle<String> MakeNameFromStack();
// A helper function for MakeNameFromStack.
Handle<String> MakeNameFromStackHelper(int pos, Handle<String> prev);
// Performs name inferring for added functions.
void InferFunctionsNames();
Isolate* isolate_;
ZoneList<int> entries_stack_;
ZoneList<Name> names_stack_;
ZoneList<FunctionLiteral*> funcs_to_infer_;
Zone* zone_;
} } // namespace v8::internal