Cleanup deoptimization code to make it architecture independent (in progress).

runtime/vm/deopt_instructions.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_DEOPT_INSTRUCTIONS_H_
 #define VM_DEOPT_INSTRUCTIONS_H_
 
 #include "vm/allocation.h"
 #include "vm/assembler.h"
 #include "vm/code_generator.h"
 #include "vm/growable_array.h"
 #include "vm/object.h"
 
 namespace dart {
 
 class Location;
 class Value;
 
 // Holds all data relevant for execution of deoptimization instructions.
 class DeoptimizationContext : public ValueObject {
  public:
   // 'to_frame_start' points to the return address just below the frame's
-  // stack pointer. 'num_args' is 0 if there are no arguments or if there
-  // are optional arguments.
+  // stack pointer (kPcAddressOffsetFromSp). 'num_args' is 0 if there are no
+  // arguments or if there are optional arguments.
   DeoptimizationContext(intptr_t* to_frame_start,
                         intptr_t to_frame_size,
                         const Array& object_table,
                         intptr_t num_args,
                         DeoptReasonId deopt_reason);
 
   intptr_t* GetFromFrameAddressAt(intptr_t index) const {
     ASSERT((0 <= index) && (index < from_frame_size_));
     return &from_frame_[index];
   }
@@ skipping 185 matching lines @@
                        DeoptInfo* info,
                        Smi* reason);
 
  private:
   static const intptr_t kEntrySize = 3;
 };
 
 }  // namespace dart
 
 #endif  // VM_DEOPT_INSTRUCTIONS_H_