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// 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,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (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),
funcs_to_infer_(4),
dot_(Factory::NewStringFromAscii(CStrVector("."))) {
}
// 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());
}
// Pushes an encountered name onto names stack when in collection state.
void PushName(Handle<String> name) {
if (IsOpen()) {
names_stack_.Add(name);
}
}
// Adds a function to infer name for.
void AddFunction(FunctionLiteral* func_to_infer) {
if (IsOpen()) {
funcs_to_infer_.Add(func_to_infer);
}
}
// Infers a function name and leaves names collection state.
void InferAndLeave() {
ASSERT(IsOpen());
if (!funcs_to_infer_.is_empty()) {
InferFunctionsNames();
}
names_stack_.Rewind(entries_stack_.RemoveLast());
}
private:
// 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();
ZoneList<int> entries_stack_;
ZoneList<Handle<String> > names_stack_;
ZoneList<FunctionLiteral*> funcs_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();
}
}
// Triggers the wrapped inferrer into name collection state.
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_
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