Change the register allocator so that it no longer tracks references...

src/arm/virtual-frame-arm.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 31 matching lines @@
 
 // On entry to a function, the virtual frame already contains the
 // receiver and the parameters.  All initial frame elements are in
 // memory.
 VirtualFrame::VirtualFrame()
     : elements_(parameter_count() + local_count() + kPreallocatedElements),
       stack_pointer_(parameter_count()) {  // 0-based index of TOS.
   for (int i = 0; i <= stack_pointer_; i++) {
     elements_.Add(FrameElement::MemoryElement());
   }
-  for (int i = 0; i < kNumRegisters; i++) {
+  for (int i = 0; i < RegisterAllocator::kNumRegisters; i++) {
     register_locations_[i] = kIllegalIndex;
   }
 }
 
 
 void VirtualFrame::SyncElementBelowStackPointer(int index) {
   UNREACHABLE();
 }
 
 
@@ skipping 26 matching lines @@
     __ sub(sp, sp, Operand(difference * kPointerSize));
   }
 
   MergeMoveRegistersToMemory(expected);
   MergeMoveRegistersToRegisters(expected);
   MergeMoveMemoryToRegisters(expected);
 
   // Fix any sync bit problems from the bottom-up, stopping when we
   // hit the stack pointer or the top of the frame if the stack
   // pointer is floating above the frame.
-  int limit = Min(static_cast<int>(stack_pointer_), elements_.length() - 1);
+  int limit = Min(static_cast<int>(stack_pointer_), element_count() - 1);
   for (int i = 0; i <= limit; i++) {
     FrameElement source = elements_[i];
     FrameElement target = expected->elements_[i];
     if (source.is_synced() && !target.is_synced()) {
       elements_[i].clear_sync();
     } else if (!source.is_synced() && target.is_synced()) {
       SyncElementAt(i);
     }
   }
 
@@ skipping 11 matching lines @@
 
 void VirtualFrame::MergeMoveRegistersToMemory(VirtualFrame* expected) {
   ASSERT(stack_pointer_ >= expected->stack_pointer_);
 
   // Move registers, constants, and copies to memory.  Perform moves
   // from the top downward in the frame in order to leave the backing
   // stores of copies in registers.
   // On ARM, all elements are in memory.
 
 #ifdef DEBUG
-  int start = Min(static_cast<int>(stack_pointer_), elements_.length() - 1);
+  int start = Min(static_cast<int>(stack_pointer_), element_count() - 1);
   for (int i = start; i >= 0; i--) {
     ASSERT(elements_[i].is_memory());
     ASSERT(expected->elements_[i].is_memory());
   }
 #endif
 }
 
 
 void VirtualFrame::MergeMoveRegistersToRegisters(VirtualFrame* expected) {
 }
@@ skipping 244 matching lines @@
   }
   PrepareForCall(spilled_args, dropped_args);
   arg0->Unuse();
   arg1->Unuse();
   return RawCallCodeObject(code, rmode);
 }
 
 
 void VirtualFrame::Drop(int count) {
   ASSERT(height() >= count);
-  int num_virtual_elements = (elements_.length() - 1) - stack_pointer_;
+  int num_virtual_elements = (element_count() - 1) - stack_pointer_;
 
   // Emit code to lower the stack pointer if necessary.
   if (num_virtual_elements < count) {
     int num_dropped = count - num_virtual_elements;
     stack_pointer_ -= num_dropped;
     __ add(sp, sp, Operand(num_dropped * kPointerSize));
   }
 
   // Discard elements from the virtual frame and free any registers.
   for (int i = 0; i < count; i++) {
     FrameElement dropped = elements_.RemoveLast();
     if (dropped.is_register()) {
       Unuse(dropped.reg());
     }
   }
 }
 
 
 Result VirtualFrame::Pop() {
   UNIMPLEMENTED();
   return Result();
 }
 
 
 void VirtualFrame::EmitPop(Register reg) {
-  ASSERT(stack_pointer_ == elements_.length() - 1);
+  ASSERT(stack_pointer_ == element_count() - 1);
   stack_pointer_--;
   elements_.RemoveLast();
   __ pop(reg);
 }
 
 
 void VirtualFrame::EmitPush(Register reg) {
-  ASSERT(stack_pointer_ == elements_.length() - 1);
+  ASSERT(stack_pointer_ == element_count() - 1);
   elements_.Add(FrameElement::MemoryElement());
   stack_pointer_++;
   __ push(reg);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal