VM: Add infrastructure to support deferred generation of unoptimized code.

runtime/vm/deferred_objects.h

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_DEFERRED_OBJECTS_H_
 #define VM_DEFERRED_OBJECTS_H_
 
 #include "platform/globals.h"
 
 namespace dart {
@@ skipping 122 matching lines @@
 
   intptr_t index() const { return index_; }
 
  private:
   const intptr_t index_;
 
   DISALLOW_COPY_AND_ASSIGN(DeferredObjectRef);
 };
 
 
+class DeferredRetAddr : public DeferredSlot {
+ public:
+  DeferredRetAddr(intptr_t index,
+                  intptr_t deopt_id,
+                  RawObject** slot,
+                  DeferredSlot* next)
+      : DeferredSlot(slot, next), index_(index), deopt_id_(deopt_id) { }
+
+  virtual void Materialize(DeoptContext* deopt_context);
+
+  intptr_t index() const { return index_; }
+
+ private:
+  const intptr_t index_;
+  const intptr_t deopt_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(DeferredRetAddr);
+};
+
+
+class DeferredPcMarker : public DeferredSlot {
+ public:
+  DeferredPcMarker(intptr_t index, RawObject** slot, DeferredSlot* next)
+      : DeferredSlot(slot, next), index_(index) { }
+
+  virtual void Materialize(DeoptContext* deopt_context);
+
+  intptr_t index() const { return index_; }
+
+ private:
+  const intptr_t index_;
+
+  DISALLOW_COPY_AND_ASSIGN(DeferredPcMarker);
+};
+
+
+class DeferredPp : public DeferredSlot {
+ public:
+  DeferredPp(intptr_t index, RawObject** slot, DeferredSlot* next)
+      : DeferredSlot(slot, next), index_(index) { }
+
+  virtual void Materialize(DeoptContext* deopt_context);
+
+  intptr_t index() const { return index_; }
+
+ private:
+  const intptr_t index_;
+
+  DISALLOW_COPY_AND_ASSIGN(DeferredPp);
+};
+
+
 // Describes an object which allocation was removed by AllocationSinking pass.
 // Arguments for materialization are stored as a part of expression stack
 // for the bottommost deoptimized frame so that GC could discover them.
 // They will be removed from the stack at the very end of deoptimization.
 class DeferredObject {
  public:
   DeferredObject(intptr_t field_count, intptr_t* args)
       : field_count_(field_count),
         args_(reinterpret_cast<RawObject**>(args)),
         object_(NULL) { }
@@ skipping 52 matching lines @@
 
   // Object materialized from this description.
   const Object* object_;
 
   DISALLOW_COPY_AND_ASSIGN(DeferredObject);
 };
 
 }  // namespace dart
 
 #endif  // VM_DEFERRED_OBJECTS_H_