Move V8 to external/v8
Change-Id: If68025d67453785a651c5dfb34fad298c16676a4
diff --git a/src/func-name-inferrer.h b/src/func-name-inferrer.h
new file mode 100644
index 0000000..e88586a
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+++ b/src/func-name-inferrer.h
@@ -0,0 +1,135 @@
+// 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_