Introduce kRegisterSize, kPCOnStackSize and kFPOnStackSize constants

src/deoptimizer.h

 // Copyright 2012 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
@@ skipping 492 matching lines @@
 
   double GetDoubleFrameSlot(unsigned offset) {
     intptr_t* ptr = GetFrameSlotPointer(offset);
     return read_double_value(reinterpret_cast<Address>(ptr));
   }
 
   void SetFrameSlot(unsigned offset, intptr_t value) {
     *GetFrameSlotPointer(offset) = value;
   }
 
+  void SetCallerPc(unsigned offset, intptr_t value) {

[danno, 2013/07/18 10:51:24]

A difference copy of this routine should be in the platform-specific files.

[haitao.feng, 2013/07/18 12:18:20]

Done.

+    if (kPCOnStackSize != kPointerSize) {
+      ASSERT(kPCOnStackSize == kPointerSize + kPointerSize);
+      SetFrameSlot(offset + kPointerSize, 0);

[danno, 2013/07/18 10:51:24]

This assumes little endianess, I would much prefer to just have a different copy
of this short routine on each platform. 

[haitao.feng, 2013/07/18 12:18:20]

Done.

+    }
+    SetFrameSlot(offset, value);
+  }
+
+  void SetCallerFp(unsigned offset, intptr_t value) {

[danno, 2013/07/18 10:51:24]

Same as above, there should be a different implementation of this function in
each deoptimizer-XXX file for each platform.

[haitao.feng, 2013/07/18 12:18:20]

Done.

+    if (kFPOnStackSize != kPointerSize) {
+      ASSERT(kFPOnStackSize == kPointerSize + kPointerSize);
+      SetFrameSlot(offset + kPointerSize, 0);
+    }
+    SetFrameSlot(offset, value);
+  }
+
   intptr_t GetRegister(unsigned n) const {
     ASSERT(n < ARRAY_SIZE(registers_));
     return registers_[n];
   }
 
   double GetDoubleRegister(unsigned n) const {
     ASSERT(n < ARRAY_SIZE(double_registers_));
     return double_registers_[n];
   }
 
@@ skipping 423 matching lines @@
   Object** expression_stack_;
   int source_position_;
 
   friend class Deoptimizer;
 };
 #endif
 
 } }  // namespace v8::internal
 
 #endif  // V8_DEOPTIMIZER_H_