Do not eagerly instantiate accessors' JSFunction.

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 5347 matching lines @@
   __ movp(Operand(base_reg, kLimitOffset), prev_limit_reg);
   __ movp(prev_limit_reg, rax);
   __ LoadAddress(arg_reg_1, ExternalReference::isolate_address(isolate));
   __ LoadAddress(rax,
                  ExternalReference::delete_handle_scope_extensions(isolate));
   __ call(rax);
   __ movp(rax, prev_limit_reg);
   __ jmp(&leave_exit_frame);
 }
 
-
 static void CallApiFunctionStubHelper(MacroAssembler* masm,
                                       const ParameterCount& argc,
                                       bool return_first_arg,
-                                      bool call_data_undefined) {
+                                      bool call_data_undefined, bool is_lazy) {
   // ----------- S t a t e -------------
   //  -- rdi                 : callee
   //  -- rbx                 : call_data
   //  -- rcx                 : holder
   //  -- rdx                 : api_function_address
   //  -- rsi                 : context
   //  -- rax                 : number of arguments if argc is a register
   //  -- rsp[0]              : return address
   //  -- rsp[8]              : last argument
   //  -- ...
@@ skipping 42 matching lines @@
   // isolate
   __ Move(scratch, ExternalReference::isolate_address(masm->isolate()));
   __ Push(scratch);
   // holder
   __ Push(holder);
 
   __ movp(scratch, rsp);
   // Push return address back on stack.
   __ PushReturnAddressFrom(return_address);
 
-  // load context from callee
-  __ movp(context, FieldOperand(callee, JSFunction::kContextOffset));
+  if (!is_lazy) {
+    // load context from callee
+    __ movp(context, FieldOperand(callee, JSFunction::kContextOffset));
+  }
 
   // Allocate the v8::Arguments structure in the arguments' space since
   // it's not controlled by GC.
   const int kApiStackSpace = 4;
 
   PrepareCallApiFunction(masm, kApiStackSpace);
 
   // FunctionCallbackInfo::implicit_args_.
   __ movp(StackSpaceOperand(0), scratch);
   if (argc.is_immediate()) {
@@ skipping 52 matching lines @@
   }
   CallApiFunctionAndReturn(masm, api_function_address, thunk_ref, callback_arg,
                            stack_space, stack_space_operand,
                            return_value_operand, &context_restore_operand);
 }
 
 
 void CallApiFunctionStub::Generate(MacroAssembler* masm) {
   bool call_data_undefined = this->call_data_undefined();
   CallApiFunctionStubHelper(masm, ParameterCount(rax), false,
-                            call_data_undefined);
+                            call_data_undefined, false);
 }
 
 
 void CallApiAccessorStub::Generate(MacroAssembler* masm) {
   bool is_store = this->is_store();
   int argc = this->argc();
   bool call_data_undefined = this->call_data_undefined();
+  bool is_lazy = this->is_lazy();
   CallApiFunctionStubHelper(masm, ParameterCount(argc), is_store,
-                            call_data_undefined);
+                            call_data_undefined, is_lazy);
 }
 
 
 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_
   //  -- ...
   //  -- r8                              : api_function_address
@@ skipping 48 matching lines @@
                            NULL);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64