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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 <vector>
#include "src/base/macros.h"
#include "src/base/pointer-with-payload.h"
namespace v8 {
namespace internal {
class AstRawString;
namespace base {
template <>
struct PointerWithPayloadTraits<v8::internal::AstRawString> {
static constexpr int kAvailableBits = 2;
} // namespace base
namespace internal {
class AstConsString;
class AstValueFactory;
class FunctionLiteral;
enum class InferName { kYes, kNo };
// 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 {
explicit FuncNameInferrer(AstValueFactory* ast_value_factory);
FuncNameInferrer(const FuncNameInferrer&) = delete;
FuncNameInferrer& operator=(const FuncNameInferrer&) = delete;
// To enter function name inference state, put a FuncNameInferrer::State
// on the stack.
class State {
explicit State(FuncNameInferrer* fni)
: fni_(fni), top_(fni->names_stack_.size()) {
~State() {
State(const State&) = delete;
State& operator=(const State&) = delete;
FuncNameInferrer* fni_;
size_t top_;
// Returns whether we have entered name collection state.
bool IsOpen() const { return scope_depth_ > 0; }
// Pushes an enclosing the name of enclosing function onto names stack.
void PushEnclosingName(const AstRawString* name);
// Pushes an encountered name onto names stack when in collection state.
void PushLiteralName(const AstRawString* name);
void PushVariableName(const AstRawString* name);
// Adds a function to infer name for.
void AddFunction(FunctionLiteral* func_to_infer) {
if (IsOpen()) {
void RemoveLastFunction() {
if (IsOpen() && !funcs_to_infer_.empty()) funcs_to_infer_.pop_back();
void RemoveAsyncKeywordFromEnd();
// Infers a function name and leaves names collection state.
void Infer() {
if (!funcs_to_infer_.empty()) InferFunctionsNames();
enum NameType : uint8_t {
struct Name {
// Needed for names_stack_.resize()
Name() { UNREACHABLE(); }
Name(const AstRawString* name, NameType type)
: name_and_type_(name, type) {}
base::PointerWithPayload<const AstRawString*, NameType, 2> name_and_type_;
inline const AstRawString* name() const {
return name_and_type_.GetPointer();
inline NameType type() const { return name_and_type_.GetPayload(); }
// Constructs a full name in dotted notation from gathered names.
AstConsString* MakeNameFromStack();
// Performs name inferring for added functions.
void InferFunctionsNames();
AstValueFactory* ast_value_factory_;
std::vector<Name> names_stack_;
std::vector<FunctionLiteral*> funcs_to_infer_;
size_t scope_depth_ = 0;
} // namespace internal
} // namespace v8