9ad39a8043
Plus the fixes on top. Reason: regresses benchmarks (JSBench) and perf (morejs). TBR=rossberg@chromium.org BUG=385404 LOG=N Review URL: https://codereview.chromium.org/345513003 git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21882 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
113 lines
3.1 KiB
C++
113 lines
3.1 KiB
C++
// Copyright 2006-2009 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef V8_FUNC_NAME_INFERRER_H_
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#define V8_FUNC_NAME_INFERRER_H_
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#include "src/handles.h"
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#include "src/zone.h"
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namespace v8 {
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namespace internal {
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class FunctionLiteral;
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class Isolate;
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// FuncNameInferrer is a stateful class that is used to perform name
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// inference for anonymous functions during static analysis of source code.
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// Inference is performed in cases when an anonymous function is assigned
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// to a variable or a property (see test-func-name-inference.cc for examples.)
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//
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// The basic idea is that during parsing of LHSs of certain expressions
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// (assignments, declarations, object literals) we collect name strings,
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// and during parsing of the RHS, a function literal can be collected. After
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// parsing the RHS we can infer a name for function literals that do not have
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// a name.
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class FuncNameInferrer : public ZoneObject {
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public:
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FuncNameInferrer(Isolate* isolate, Zone* zone);
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// Returns whether we have entered name collection state.
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bool IsOpen() const { return !entries_stack_.is_empty(); }
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// Pushes an enclosing the name of enclosing function onto names stack.
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void PushEnclosingName(Handle<String> name);
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// Enters name collection state.
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void Enter() {
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entries_stack_.Add(names_stack_.length(), zone());
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}
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// Pushes an encountered name onto names stack when in collection state.
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void PushLiteralName(Handle<String> name);
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void PushVariableName(Handle<String> name);
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// Adds a function to infer name for.
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void AddFunction(FunctionLiteral* func_to_infer) {
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if (IsOpen()) {
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funcs_to_infer_.Add(func_to_infer, zone());
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}
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}
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void RemoveLastFunction() {
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if (IsOpen() && !funcs_to_infer_.is_empty()) {
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funcs_to_infer_.RemoveLast();
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}
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}
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// Infers a function name and leaves names collection state.
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void Infer() {
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ASSERT(IsOpen());
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if (!funcs_to_infer_.is_empty()) {
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InferFunctionsNames();
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}
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}
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// Leaves names collection state.
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void Leave() {
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ASSERT(IsOpen());
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names_stack_.Rewind(entries_stack_.RemoveLast());
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if (entries_stack_.is_empty())
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funcs_to_infer_.Clear();
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}
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private:
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enum NameType {
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kEnclosingConstructorName,
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kLiteralName,
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kVariableName
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};
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struct Name {
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Name(Handle<String> name, NameType type) : name(name), type(type) { }
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Handle<String> name;
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NameType type;
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};
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Isolate* isolate() { return isolate_; }
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Zone* zone() const { return zone_; }
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// Constructs a full name in dotted notation from gathered names.
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Handle<String> MakeNameFromStack();
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// A helper function for MakeNameFromStack.
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Handle<String> MakeNameFromStackHelper(int pos, Handle<String> prev);
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// Performs name inferring for added functions.
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void InferFunctionsNames();
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Isolate* isolate_;
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ZoneList<int> entries_stack_;
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ZoneList<Name> names_stack_;
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ZoneList<FunctionLiteral*> funcs_to_infer_;
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Zone* zone_;
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DISALLOW_COPY_AND_ASSIGN(FuncNameInferrer);
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};
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} } // namespace v8::internal
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#endif // V8_FUNC_NAME_INFERRER_H_
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