| // Copyright 2006-2009 the V8 project authors. All rights reserved. |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // * Redistributions of source code must retain the above copyright |
| // notice, this list of conditions and the following disclaimer. |
| // * Redistributions in binary form must reproduce the above |
| // copyright notice, this list of conditions and the following |
| // disclaimer in the documentation and/or other materials provided |
| // with the distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #ifndef V8_FUNC_NAME_INFERRER_H_ |
| #define V8_FUNC_NAME_INFERRER_H_ |
| |
| namespace v8 { namespace internal { |
| |
| // 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 test-func-name-inference.cc for examples.) |
| |
| // The basic idea is that during AST traversal LHSs of expressions are |
| // always visited before RHSs. Thus, during visiting the LHS, a name can be |
| // collected, and during visiting the RHS, a function literal can be collected. |
| // Inference is performed while leaving the assignment node. |
| |
| class FuncNameInferrer BASE_EMBEDDED { |
| public: |
| FuncNameInferrer() : |
| entries_stack_(10), |
| names_stack_(5), |
| func_to_infer_(NULL), |
| dot_(Factory::NewStringFromAscii(CStrVector("."))) { |
| } |
| |
| bool IsOpen() const { return !entries_stack_.is_empty(); } |
| |
| void PushEnclosingName(Handle<String> name); |
| |
| void Enter() { |
| entries_stack_.Add(names_stack_.length()); |
| } |
| |
| void Leave() { |
| ASSERT(IsOpen()); |
| names_stack_.Rewind(entries_stack_.RemoveLast()); |
| } |
| |
| void PushName(Handle<String> name) { |
| if (IsOpen()) { |
| names_stack_.Add(name); |
| } |
| } |
| |
| void SetFuncToInfer(FunctionLiteral* func_to_infer) { |
| if (IsOpen()) { |
| // If we encounter another function literal after already having |
| // encountered one, the second one replaces the first. |
| func_to_infer_ = func_to_infer; |
| } |
| } |
| |
| void InferAndLeave() { |
| ASSERT(IsOpen()); |
| MaybeInferFunctionName(); |
| Leave(); |
| } |
| |
| private: |
| Handle<String> MakeNameFromStack(); |
| Handle<String> MakeNameFromStackHelper(int pos, Handle<String> prev); |
| void MaybeInferFunctionName(); |
| |
| List<int> entries_stack_; |
| List<Handle<String> > names_stack_; |
| FunctionLiteral* func_to_infer_; |
| Handle<String> dot_; |
| |
| DISALLOW_COPY_AND_ASSIGN(FuncNameInferrer); |
| }; |
| |
| |
| // A wrapper class that automatically calls InferAndLeave when |
| // leaving scope. |
| class ScopedFuncNameInferrer BASE_EMBEDDED { |
| public: |
| explicit ScopedFuncNameInferrer(FuncNameInferrer* inferrer) : |
| inferrer_(inferrer), |
| is_entered_(false) {} |
| ~ScopedFuncNameInferrer() { |
| if (is_entered_) { |
| inferrer_->InferAndLeave(); |
| } |
| } |
| |
| void Enter() { |
| inferrer_->Enter(); |
| is_entered_ = true; |
| } |
| |
| private: |
| FuncNameInferrer* inferrer_; |
| bool is_entered_; |
| |
| DISALLOW_COPY_AND_ASSIGN(ScopedFuncNameInferrer); |
| }; |
| |
| |
| } } // namespace v8::internal |
| |
| #endif // V8_FUNC_NAME_INFERRER_H_ |