Refactor HInferRepresentation into an HPhase and use the phase zone.

src/hydrogen-infer-representation.h

Index: src/hydrogen-infer-representation.h
diff --git a/src/vm-state.h b/src/hydrogen-infer-representation.h
similarity index 72%
copy from src/vm-state.h
copy to src/hydrogen-infer-representation.h
index 765b5701595b7f9637da05b0783662d603506463..7c605696c4b956152bdd9dfc74c83e80569e3714 100644
--- a/src/vm-state.h
+++ b/src/hydrogen-infer-representation.h
@@ -1,4 +1,4 @@
-// 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:
@@ -25,37 +25,33 @@
 // (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_INFER_REPRESENTATION_H_
+#define V8_HYDROGEN_INFER_REPRESENTATION_H_
 
-#include "allocation.h"
-#include "isolate.h"
+#include "hydrogen.h"
 
 namespace v8 {
 namespace internal {
 
-template <StateTag Tag>
-class VMState BASE_EMBEDDED {
- public:
-  explicit inline VMState(Isolate* isolate);
-  inline ~VMState();
 
- private:
-  Isolate* isolate_;
-  StateTag previous_tag_;
-};
+class HInferRepresentationPhase : public HPhase {
+ public:
+  explicit HInferRepresentationPhase(HGraph* graph)
+      : HPhase("H_Infer representations", graph),
+        worklist_(8, zone()),
+        in_worklist_(graph->GetMaximumValueID(), zone()) { }
 
+  void Run();
+  void AddToWorklist(HValue* current);
 
-class ExternalCallbackScope BASE_EMBEDDED {
- public:
-  inline ExternalCallbackScope(Isolate* isolate, Address callback);
-  inline ~ExternalCallbackScope();
  private:
-  Isolate* isolate_;
-  Address previous_callback_;
+  ZoneList<HValue*> worklist_;
+  BitVector in_worklist_;
+
+  DISALLOW_COPY_AND_ASSIGN(HInferRepresentationPhase);
 };
 
-} }  // namespace v8::internal
 
+} }  // namespace v8::internal
 
-#endif  // V8_VM_STATE_H_
+#endif  // V8_HYDROGEN_INFER_REPRESENTATION_H_