Write barrier for storing a code entry, and usage in CompileLazy builtin.

src/x64/builtins-x64.cc

 // Copyright 2012 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/code-factory.h"
 #include "src/codegen.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 964 matching lines @@
                        SharedFunctionInfo::OffsetToPreviousCachedCode()));
   __ movp(entry, FieldOperand(entry, WeakCell::kValueOffset));
   __ JumpIfSmi(entry, &maybe_call_runtime);
 
   // Found literals and code. Get them into the closure and return.
   __ leap(entry, FieldOperand(entry, Code::kHeaderSize));
 
   Label install_optimized_code_and_tailcall;
   __ bind(&install_optimized_code_and_tailcall);
   __ movp(FieldOperand(closure, JSFunction::kCodeEntryOffset), entry);
+  __ movp(rbx, entry);
+  __ RecordWriteCodeEntryField(closure, rbx, rax);
 
   // Link the closure into the optimized function list.
   // rcx : code entry (entry)
   // r14 : native context
   // rdx : new target
   // rdi : closure
   __ movp(rbx,
           ContextOperand(native_context, Context::OPTIMIZED_FUNCTIONS_LIST));
   __ movp(FieldOperand(closure, JSFunction::kNextFunctionLinkOffset), rbx);
   __ RecordWriteField(closure, JSFunction::kNextFunctionLinkOffset, rbx, rax,
@@ skipping 34 matching lines @@
   __ movp(entry, FieldOperand(closure, JSFunction::kSharedFunctionInfoOffset));
   __ movp(entry, FieldOperand(entry, SharedFunctionInfo::kCodeOffset));
   __ movl(rbx, FieldOperand(entry, Code::kFlagsOffset));
   __ andl(rbx, Immediate(Code::KindField::kMask));
   __ shrl(rbx, Immediate(Code::KindField::kShift));
   __ cmpl(rbx, Immediate(Code::BUILTIN));
   __ j(equal, &gotta_call_runtime);
   // Yes, install the full code.
   __ leap(entry, FieldOperand(entry, Code::kHeaderSize));
   __ movp(FieldOperand(closure, JSFunction::kCodeEntryOffset), entry);
+  __ movp(rbx, entry);
+  __ RecordWriteCodeEntryField(closure, rbx, rax);
   __ jmp(entry);
 
   __ bind(&gotta_call_runtime);
   CallRuntimePassFunction(masm, Runtime::kCompileLazy);
   GenerateTailCallToReturnedCode(masm);
 }
 
 
 void Builtins::Generate_CompileOptimized(MacroAssembler* masm) {
   CallRuntimePassFunction(masm, Runtime::kCompileOptimized_NotConcurrent);
@@ skipping 1829 matching lines @@
   __ ret(0);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64