add a default value for return value

src/x64/stub-cache-x64.cc

 // Copyright 2012 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 431 matching lines @@
                                 int argc) {
   // ----------- S t a t e -------------
   //  -- rsp[0]              : return address
   //  -- rsp[8]              : object passing the type check
   //                           (last fast api call extra argument,
   //                            set by CheckPrototypes)
   //  -- rsp[16]             : api function
   //                           (first fast api call extra argument)
   //  -- rsp[24]             : api call data
   //  -- rsp[32]             : isolate
-  //  -- rsp[40]             : ReturnValue
+  //  -- rsp[40]             : ReturnValue default value
+  //  -- rsp[48]             : ReturnValue
   //
-  //  -- rsp[48]             : last argument
+  //  -- rsp[56]             : last argument
   //  -- ...
-  //  -- rsp[(argc + 5) * 8] : first argument
-  //  -- rsp[(argc + 6) * 8] : receiver
+  //  -- rsp[(argc + 6) * 8] : first argument
+  //  -- rsp[(argc + 7) * 8] : receiver
   // -----------------------------------
   // Get the function and setup the context.
   Handle<JSFunction> function = optimization.constant_function();
   __ LoadHeapObject(rdi, function);
   __ movq(rsi, FieldOperand(rdi, JSFunction::kContextOffset));
 
   // Pass the additional arguments.
   __ movq(Operand(rsp, 2 * kPointerSize), rdi);
   Handle<CallHandlerInfo> api_call_info = optimization.api_call_info();
   Handle<Object> call_data(api_call_info->data(), masm->isolate());
   if (masm->isolate()->heap()->InNewSpace(*call_data)) {
     __ Move(rcx, api_call_info);
     __ movq(rbx, FieldOperand(rcx, CallHandlerInfo::kDataOffset));
     __ movq(Operand(rsp, 3 * kPointerSize), rbx);
   } else {
     __ Move(Operand(rsp, 3 * kPointerSize), call_data);
   }
   __ movq(kScratchRegister,
           ExternalReference::isolate_address(masm->isolate()));
   __ movq(Operand(rsp, 4 * kPointerSize), kScratchRegister);
   __ LoadRoot(kScratchRegister, Heap::kUndefinedValueRootIndex);
   __ movq(Operand(rsp, 5 * kPointerSize), kScratchRegister);
+  __ movq(Operand(rsp, 6 * kPointerSize), kScratchRegister);
 
   // Prepare arguments.
-  STATIC_ASSERT(kFastApiCallArguments == 5);
+  STATIC_ASSERT(kFastApiCallArguments == 6);
   __ lea(rbx, Operand(rsp, kFastApiCallArguments * kPointerSize));
 
   // Function address is a foreign pointer outside V8's heap.
   Address function_address = v8::ToCData<Address>(api_call_info->callback());
   bool returns_handle =
       !CallbackTable::ReturnsVoid(masm->isolate(), function_address);
 
 #if defined(__MINGW64__)
   Register arguments_arg = rcx;
 #elif defined(_WIN64)
@@ skipping 805 matching lines @@
   __ push(reg);  // holder
   if (heap()->InNewSpace(callback->data())) {
     __ Move(scratch1(), callback);
     __ push(FieldOperand(scratch1(),
                          ExecutableAccessorInfo::kDataOffset));  // data
   } else {
     __ Push(Handle<Object>(callback->data(), isolate()));
   }
   __ LoadRoot(kScratchRegister, Heap::kUndefinedValueRootIndex);
   __ push(kScratchRegister);  // return value
+  __ push(kScratchRegister);  // return value default
   __ PushAddress(ExternalReference::isolate_address(isolate()));
   __ push(name());  // name
   // Save a pointer to where we pushed the arguments pointer.  This will be
   // passed as the const ExecutableAccessorInfo& to the C++ callback.
 
   Address getter_address = v8::ToCData<Address>(callback->getter());
   bool returns_handle =
       !CallbackTable::ReturnsVoid(isolate(), getter_address);
 
 #if defined(__MINGW64__)
@@ skipping 12 matching lines @@
   __ movq(name_arg, rsp);
   __ push(scratch2());  // Restore return address.
 
   // v8::Arguments::values_ and handler for name.
   const int kStackSpace = PropertyCallbackArguments::kArgsLength + 1;
 
   // Allocate v8::AccessorInfo in non-GCed stack space.
   const int kArgStackSpace = 1;
 
   __ PrepareCallApiFunction(kArgStackSpace, returns_handle);
-  STATIC_ASSERT(PropertyCallbackArguments::kArgsLength == 5);
-  __ lea(rax, Operand(name_arg, 5 * kPointerSize));
+  STATIC_ASSERT(PropertyCallbackArguments::kArgsLength == 6);
+  __ lea(rax, Operand(name_arg, 6 * kPointerSize));
 
   // v8::AccessorInfo::args_.
   __ movq(StackSpaceOperand(0), rax);
 
   // The context register (rsi) has been saved in PrepareCallApiFunction and
   // could be used to pass arguments.
   __ lea(accessor_info_arg, StackSpaceOperand(0));
 
   __ CallApiFunctionAndReturn(getter_address,
                               kStackSpace,
                               returns_handle,
-                              4);
+                              5);
 }
 
 
 void BaseLoadStubCompiler::GenerateLoadConstant(Handle<JSFunction> value) {
   // Return the constant value.
   __ LoadHeapObject(rax, value);
   __ ret(0);
 }
 
 
@@ skipping 2119 matching lines @@
     TailCallBuiltin(masm, Builtins::kKeyedStoreIC_Slow);
   }
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64