Revert of Array length reduction should throw in strict mode if it can't delete an element.

src/x64/code-stubs-x64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
 #include "src/ic/handler-compiler.h"
@@ skipping 5350 matching lines @@
   bool is_store = this->is_store();
   int argc = this->argc();
   bool call_data_undefined = this->call_data_undefined();
   CallApiFunctionStubHelper(masm, ParameterCount(argc), is_store,
                             call_data_undefined);
 }
 
 
 void CallApiGetterStub::Generate(MacroAssembler* masm) {
   // ----------- S t a t e -------------
-  //  -- rsp[0]                          : return address
-  //  -- rsp[8]                          : name
-  //  -- rsp[16 .. (16 + kArgsLength*8)] : v8::PropertyCallbackInfo::args_
+  //  -- rsp[0]                  : return address
+  //  -- rsp[8]                  : name
+  //  -- rsp[16 - kArgsLength*8] : PropertyCallbackArguments object
   //  -- ...
-  //  -- r8                              : api_function_address
+  //  -- r8                    : api_function_address
   // -----------------------------------
 
 #if defined(__MINGW64__) || defined(_WIN64)
   Register getter_arg = r8;
   Register accessor_info_arg = rdx;
   Register name_arg = rcx;
 #else
   Register getter_arg = rdx;
   Register accessor_info_arg = rsi;
   Register name_arg = rdi;
 #endif
   Register api_function_address = ApiGetterDescriptor::function_address();
   DCHECK(api_function_address.is(r8));
   Register scratch = rax;
 
-  // v8::PropertyCallbackInfo::args_ array and name handle.
-  const int kStackUnwindSpace = PropertyCallbackArguments::kArgsLength + 1;
+  // v8::Arguments::values_ and handler for name.
+  const int kStackSpace = PropertyCallbackArguments::kArgsLength + 1;
 
-  // Allocate v8::PropertyCallbackInfo in non-GCed stack space.
+  // Allocate v8::AccessorInfo in non-GCed stack space.
   const int kArgStackSpace = 1;
 
-  // Load address of v8::PropertyAccessorInfo::args_ array.
-  __ leap(scratch, Operand(rsp, 2 * kPointerSize));
+  __ leap(name_arg, Operand(rsp, kPCOnStackSize));
 
   PrepareCallApiFunction(masm, kArgStackSpace);
-  // Create v8::PropertyCallbackInfo object on the stack and initialize
-  // it's args_ field.
-  Operand info_object = StackSpaceOperand(0);
-  __ movp(info_object, scratch);
+  __ leap(scratch, Operand(name_arg, 1 * kPointerSize));
 
-  __ leap(name_arg, Operand(scratch, -kPointerSize));
+  // v8::PropertyAccessorInfo::args_.
+  __ movp(StackSpaceOperand(0), scratch);
+
   // The context register (rsi) has been saved in PrepareCallApiFunction and
   // could be used to pass arguments.
-  __ leap(accessor_info_arg, info_object);
+  __ leap(accessor_info_arg, StackSpaceOperand(0));
 
   ExternalReference thunk_ref =
       ExternalReference::invoke_accessor_getter_callback(isolate());
 
   // It's okay if api_function_address == getter_arg
   // but not accessor_info_arg or name_arg
   DCHECK(!api_function_address.is(accessor_info_arg) &&
          !api_function_address.is(name_arg));
 
-  // +3 is to skip prolog, return address and name handle.
-  Operand return_value_operand(
-      rbp, (PropertyCallbackArguments::kReturnValueOffset + 3) * kPointerSize);
+  // The name handler is counted as an argument.
+  StackArgumentsAccessor args(rbp, PropertyCallbackArguments::kArgsLength);
+  Operand return_value_operand = args.GetArgumentOperand(
+      PropertyCallbackArguments::kArgsLength - 1 -
+      PropertyCallbackArguments::kReturnValueOffset);
   CallApiFunctionAndReturn(masm, api_function_address, thunk_ref, getter_arg,
-                           kStackUnwindSpace, nullptr, return_value_operand,
-                           NULL);
+                           kStackSpace, nullptr, return_value_operand, NULL);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64