Port faster callbacks invocation to x64.

src/ia32/stub-cache-ia32.cc

 // Copyright 2006-2009 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 1015 matching lines @@
                                         AccessorInfo* callback,
                                         String* name,
                                         Label* miss,
                                         Failure** failure) {
   // Check that the receiver isn't a smi.
   __ test(receiver, Immediate(kSmiTagMask));
   __ j(zero, miss, not_taken);
 
   // Check that the maps haven't changed.
   Register reg =
-      CheckPrototypes(object, receiver, holder,
-                      scratch1, scratch2, scratch3, name, miss);
+      CheckPrototypes(object, receiver, holder, scratch1,
+                      scratch2, scratch3, name, miss);
 
   Handle<AccessorInfo> callback_handle(callback);
 
-  Register other = reg.is(scratch1) ? scratch2 : scratch1;
   __ EnterInternalFrame();
-  __ PushHandleScope(other);
-  // Push the stack address where the list of arguments ends
-  __ mov(other, esp);
-  __ sub(Operand(other), Immediate(2 * kPointerSize));
-  __ push(other);
+  __ PushHandleScope(scratch2);
+  // Push the stack address where the list of arguments ends.
+  __ mov(scratch2, esp);
+  __ sub(Operand(scratch2), Immediate(2 * kPointerSize));
+  __ push(scratch2);
   __ push(receiver);  // receiver
   __ push(reg);  // holder
   // Push data from AccessorInfo.
   if (Heap::InNewSpace(callback_handle->data())) {
-    __ mov(other, Immediate(callback_handle));
-    __ push(FieldOperand(other, AccessorInfo::kDataOffset));
+    __ mov(scratch2, Immediate(callback_handle));
+    __ push(FieldOperand(scratch2, AccessorInfo::kDataOffset));
   } else {
     __ push(Immediate(Handle<Object>(callback_handle->data())));
   }
   __ push(name_reg);  // name
   // Save a pointer to where we pushed the arguments pointer.
   // This will be passed as the const AccessorInfo& to the C++ callback.
   __ mov(eax, esp);
   __ add(Operand(eax), Immediate(4 * kPointerSize));
   __ mov(ebx, esp);
 
   // Do call through the api.
   ASSERT_EQ(5, ApiGetterEntryStub::kStackSpace);
   Address getter_address = v8::ToCData<Address>(callback->getter());
   ApiFunction fun(getter_address);
   ApiGetterEntryStub stub(callback_handle, &fun);
   // Emitting a stub call may try to allocate (if the code is not
   // already generated).  Do not allow the assembler to perform a
   // garbage collection but instead return the allocation failure
   // object.
   Object* result = masm()->TryCallStub(&stub);
   if (result->IsFailure()) {
     *failure = Failure::cast(result);
     return false;
   }
 
   // We need to avoid using eax since that now holds the result.
-  Register tmp = other.is(eax) ? reg : other;
+  Register tmp = scratch2.is(eax) ? reg : scratch2;
   // Emitting PopHandleScope may try to allocate.  Do not allow the
   // assembler to perform a garbage collection but instead return a
   // failure object.
   result = masm()->TryPopHandleScope(eax, tmp);
   if (result->IsFailure()) {
     *failure = Failure::cast(result);
     return false;
   }
   __ LeaveInternalFrame();
 
@@ skipping 1650 matching lines @@
   // Return the generated code.
   return GetCode();
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32