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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 {
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 test-func-name-inference.cc 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 {
public:
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()) {
funcs_to_infer_.RemoveLast();
}
}
// Infers a function name and leaves names collection state.
void Infer() {
ASSERT(IsOpen());
if (!funcs_to_infer_.is_empty()) {
InferFunctionsNames();
}
}
// Leaves names collection state.
void Leave() {
ASSERT(IsOpen());
names_stack_.Rewind(entries_stack_.RemoveLast());
if (entries_stack_.is_empty())
funcs_to_infer_.Clear();
}
private:
enum NameType {
kEnclosingConstructorName,
kLiteralName,
kVariableName
};
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_;
DISALLOW_COPY_AND_ASSIGN(FuncNameInferrer);
};
} } // namespace v8::internal
#endif // V8_FUNC_NAME_INFERRER_H_
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