X64: Count operations (increment, decrement)

src/x64/virtual-frame-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 266 matching lines @@
   for (int i = new_backing_index + 1; i < element_count(); i++) {
     if (elements_[i].is_copy() && elements_[i].index() == index) {
       elements_[i].set_index(new_backing_index);
       elements_[new_backing_index].set_copied();
     }
   }
   return new_backing_index;
 }
 
 
+void VirtualFrame::TakeFrameSlotAt(int index) {
+  ASSERT(index >= 0);
+  ASSERT(index <= element_count());
+  FrameElement original = elements_[index];
+  int new_backing_store_index = InvalidateFrameSlotAt(index);
+  if (new_backing_store_index != kIllegalIndex) {
+    elements_.Add(CopyElementAt(new_backing_store_index));
+    return;
+  }
+
+  switch (original.type()) {
+    case FrameElement::MEMORY: {
+      // Emit code to load the original element's data into a register.
+      // Push that register as a FrameElement on top of the frame.
+      Result fresh = cgen()->allocator()->Allocate();
+      ASSERT(fresh.is_valid());
+      FrameElement new_element =
+          FrameElement::RegisterElement(fresh.reg(),
+                                        FrameElement::NOT_SYNCED);
+      Use(fresh.reg(), element_count());
+      elements_.Add(new_element);
+      __ movq(fresh.reg(), Operand(rbp, fp_relative(index)));
+      break;
+    }
+    case FrameElement::REGISTER:
+      Use(original.reg(), element_count());
+      // Fall through.
+    case FrameElement::CONSTANT:
+    case FrameElement::COPY:
+      original.clear_sync();
+      elements_.Add(original);
+      break;
+    case FrameElement::INVALID:
+      UNREACHABLE();
+      break;
+  }
+}
+
+
 void VirtualFrame::StoreToFrameSlotAt(int index) {
   // Store the value on top of the frame to the virtual frame slot at
   // a given index.  The value on top of the frame is left in place.
   // This is a duplicating operation, so it can create copies.
   ASSERT(index >= 0);
   ASSERT(index < element_count());
 
   int top_index = element_count() - 1;
   FrameElement top = elements_[top_index];
   FrameElement original = elements_[index];
@@ skipping 698 matching lines @@
 
   name.Unuse();
   value.Unuse();
   return RawCallCodeObject(ic, RelocInfo::CODE_TARGET);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal