[WIP] Initial CallFunctionCallback builtin.

src/ia32/code-stubs-ia32.cc

Index: src/ia32/code-stubs-ia32.cc
diff --git a/src/ia32/code-stubs-ia32.cc b/src/ia32/code-stubs-ia32.cc
index 6550d6e016cb587cb9bc22a6ac3c61333ac1ad6b..9053a431cf9cfed99a79f4c18d835c0171acecb9 100644
--- a/src/ia32/code-stubs-ia32.cc
+++ b/src/ia32/code-stubs-ia32.cc
@@ -2670,40 +2670,8 @@ static void CallApiFunctionAndReturn(MacroAssembler* masm,
          Immediate(isolate->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 = eax;
-  Register map = ecx;
-
-  __ JumpIfSmi(return_value, &ok, Label::kNear);
-  __ mov(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);
-
-  __ cmp(map, isolate->factory()->heap_number_map());
-  __ j(equal, &ok, Label::kNear);
-
-  __ cmp(return_value, isolate->factory()->undefined_value());
-  __ j(equal, &ok, Label::kNear);
-
-  __ cmp(return_value, isolate->factory()->true_value());
-  __ j(equal, &ok, Label::kNear);
-
-  __ cmp(return_value, isolate->factory()->false_value());
-  __ j(equal, &ok, Label::kNear);
-
-  __ cmp(return_value, isolate->factory()->null_value());
-  __ j(equal, &ok, Label::kNear);
-
-  __ Abort(kAPICallReturnedInvalidObject);
-
-  __ bind(&ok);
-#endif
+  __ AssertApiCallResult(eax);
 
   if (stack_space_operand != nullptr) {
     DCHECK_EQ(0, stack_space);
@@ -2800,6 +2768,12 @@ void CallApiCallbackStub::Generate(MacroAssembler* masm) {
     __ mov(context, FieldOperand(callee, JSFunction::kContextOffset));
   }
 
+  if (!this->is_store()) {
+    __ mov(eax, Immediate(this->argc()));
+    __ Jump(masm->isolate()->builtins()->CallFunctionCallback(),
+            RelocInfo::CODE_TARGET);
+  }
+
   // API function gets reference to the v8::Arguments. If CPU profiler
   // is enabled wrapper function will be called and we need to pass
   // address of the callback as additional parameter, always allocate