[WIP] Initial CallFunctionCallback builtin.

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/api-arguments.h"
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 2618 matching lines @@
   if (stack_space_operand != nullptr) {
     __ movp(rbx, *stack_space_operand);
   }
   __ LeaveApiExitFrame(!restore_context);
 
   // Check if the function scheduled an exception.
   __ Move(rdi, scheduled_exception_address);
   __ Cmp(Operand(rdi, 0), factory->the_hole_value());
   __ j(not_equal, &promote_scheduled_exception);
 
-#if DEBUG
   // Check if the function returned a valid JavaScript value.
-  Label ok;
-  Register return_value = rax;
-  Register map = rcx;
-
-  __ JumpIfSmi(return_value, &ok, Label::kNear);
-  __ movp(map, FieldOperand(return_value, HeapObject::kMapOffset));
-
-  __ CmpInstanceType(map, LAST_NAME_TYPE);
-  __ j(below_equal, &ok, Label::kNear);
-
-  __ CmpInstanceType(map, FIRST_JS_RECEIVER_TYPE);
-  __ j(above_equal, &ok, Label::kNear);
-
-  __ CompareRoot(map, Heap::kHeapNumberMapRootIndex);
-  __ j(equal, &ok, Label::kNear);
-
-  __ CompareRoot(return_value, Heap::kUndefinedValueRootIndex);
-  __ j(equal, &ok, Label::kNear);
-
-  __ CompareRoot(return_value, Heap::kTrueValueRootIndex);
-  __ j(equal, &ok, Label::kNear);
-
-  __ CompareRoot(return_value, Heap::kFalseValueRootIndex);
-  __ j(equal, &ok, Label::kNear);
-
-  __ CompareRoot(return_value, Heap::kNullValueRootIndex);
-  __ j(equal, &ok, Label::kNear);
-
-  __ Abort(kAPICallReturnedInvalidObject);
-
-  __ bind(&ok);
-#endif
+  __ AssertApiCallResult(rax);
 
   if (stack_space_operand != nullptr) {
     DCHECK_EQ(stack_space, 0);
     __ PopReturnAddressTo(rcx);
     __ addq(rsp, rbx);
     __ jmp(rcx);
   } else {
     __ ret(stack_space * kPointerSize);
   }
 
@@ skipping 74 matching lines @@
 
   __ movp(scratch, rsp);
   // Push return address back on stack.
   __ PushReturnAddressFrom(return_address);
 
   if (!this->is_lazy()) {
     // load context from callee
     __ movp(context, FieldOperand(callee, JSFunction::kContextOffset));
   }
 
+  if (!this->is_store()) {
+    __ Set(rax, this->argc());
+    __ jmp(masm->isolate()->builtins()->CallFunctionCallback(),
+           RelocInfo::CODE_TARGET);
+  }
+
   // Allocate the v8::Arguments structure in the arguments' space since
   // it's not controlled by GC.
   const int kApiStackSpace = 3;
 
   PrepareCallApiFunction(masm, kApiStackSpace);
 
   // FunctionCallbackInfo::implicit_args_.
   int argc = this->argc();
   __ movp(StackSpaceOperand(0), scratch);
   __ addp(scratch, Immediate((argc + FCA::kArgsLength - 1) * kPointerSize));
@@ skipping 117 matching lines @@
                            kStackUnwindSpace, nullptr, return_value_operand,
                            NULL);
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64