Cleanup the way the debugger stores live registers when entering at a break...

src/x64/frames-x64.cc

 // Copyright 2009 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 40 matching lines @@
 
 
 StackFrame::Type ExitFrame::GetStateForFramePointer(Address fp, State* state) {
   if (fp == 0) return NONE;
   // Compute the stack pointer.
   Address sp = Memory::Address_at(fp + ExitFrameConstants::kSPOffset);
   // Fill in the state.
   state->fp = fp;
   state->sp = sp;
   state->pc_address = reinterpret_cast<Address*>(sp - 1 * kPointerSize);
-  // Determine frame type.
+  ASSERT(*state->pc_address != NULL);
   return EXIT;
 }
 
 int JavaScriptFrame::GetProvidedParametersCount() const {
   return ComputeParametersCount();
 }
 
 
 void ExitFrame::Iterate(ObjectVisitor* v) const {
   v->VisitPointer(&code_slot());
@@ skipping 32 matching lines @@
 byte* ArgumentsAdaptorFrame::GetCallerStackPointer() const {
   const int arguments = Smi::cast(GetExpression(0))->value();
   const int offset = StandardFrameConstants::kCallerSPOffset;
   return fp() + offset + (arguments + 1) * kPointerSize;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64