Optimizing HandleScope. Also fixed HandleScope destruction when API getter th...

src/x64/stub-cache-x64.cc

 // Copyright 2010 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 2525 matching lines @@
   __ JumpIfSmi(receiver, miss);
 
   // Check that the maps haven't changed.
   Register reg =
       CheckPrototypes(object, receiver, holder, scratch1,
                       scratch2, scratch3, name, miss);
 
   Handle<AccessorInfo> callback_handle(callback);
 
   __ EnterInternalFrame();
-  __ PushHandleScope(scratch2);
   // Push the stack address where the list of arguments ends.
   __ movq(scratch2, rsp);
   __ subq(scratch2, Immediate(2 * kPointerSize));
   __ push(scratch2);
   __ push(receiver);  // receiver
   __ push(reg);  // holder
   if (Heap::InNewSpace(callback_handle->data())) {
     __ Move(scratch2, callback_handle);
     __ push(FieldOperand(scratch2, AccessorInfo::kDataOffset));  // data
   } else {
@@ skipping 33 matching lines @@
   // object.
   Object* result = masm()->TryCallStub(&stub);
   if (result->IsFailure()) {
     *failure = Failure::cast(result);
     return false;
   }
 #ifdef _WIN64
   // Discard allocated slot.
   __ addq(rsp, Immediate(kPointerSize));
 #endif
-
-  // We need to avoid using rax since that now holds the result.
-  Register tmp = scratch2.is(rax) ? 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(rax, tmp);
-  if (result->IsFailure()) {
-    *failure = Failure::cast(result);
-    return false;
-  }
   __ LeaveInternalFrame();
 
   __ ret(0);
 
   return true;
 }
 
 
 Register StubCompiler::CheckPrototypes(JSObject* object,
                                        Register object_reg,
@@ skipping 313 matching lines @@
   // Return the generated code.
   return GetCode();
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64