First simplistic implementation of escape analysis.

src/hydrogen-escape-analysis.h

-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2013 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_VM_STATE_H_
-#define V8_VM_STATE_H_
+#ifndef V8_HYDROGEN_ESCAPE_ANALYSIS_H_
+#define V8_HYDROGEN_ESCAPE_ANALYSIS_H_
 
 #include "allocation.h"
-#include "isolate.h"
+#include "hydrogen.h"
 
 namespace v8 {
 namespace internal {
 
-template <StateTag Tag>
-class VMState BASE_EMBEDDED {
+
+class HEscapeAnalysis BASE_EMBEDDED {
  public:
-  explicit inline VMState(Isolate* isolate);
-  inline ~VMState();
+  explicit HEscapeAnalysis(HGraph* graph)
+      : graph_(graph), zone_(graph->zone()), captured_(0, zone_) { }
+
+  void Analyze();
 
  private:
-  Isolate* isolate_;
-  StateTag previous_tag_;
+  void CollectCapturedValues();
+  void CollectIfNoEscapingUses(HInstruction* instr);
+
+  HGraph* graph_;
+  Zone* zone_;
+  ZoneList<HValue*> captured_;
 };
 
 
-class ExternalCallbackScope BASE_EMBEDDED {
- public:
-  inline ExternalCallbackScope(Isolate* isolate, Address callback);
-  inline ~ExternalCallbackScope();
- private:
-  Isolate* isolate_;
-  Address previous_callback_;
-};
-
 } }  // namespace v8::internal
 
-
-#endif  // V8_VM_STATE_H_
+#endif  // V8_HYDROGEN_ESCAPE_ANALYSIS_H_