[WIP] Initial CallFunctionCallback builtin.

src/x64/macro-assembler-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/base/bits.h"
 #include "src/base/division-by-constant.h"
 #include "src/base/utils/random-number-generator.h"
 #include "src/bootstrapper.h"
@@ skipping 3750 matching lines @@
     Label done_checking;
     AssertNotSmi(object);
     Cmp(object, isolate()->factory()->undefined_value());
     j(equal, &done_checking);
     Cmp(FieldOperand(object, 0), isolate()->factory()->allocation_site_map());
     Assert(equal, kExpectedUndefinedOrCell);
     bind(&done_checking);
   }
 }
 
+void MacroAssembler::AssertApiCallResult(Register object) {
+  if (emit_debug_code()) {
+    Label done_checking;
+    Push(object);
+
+    // Check for Smis.
+    JumpIfSmi(object, &done_checking, Label::kNear);
+
+    // Check for valid Oddballs.
+    JumpIfRoot(object, Heap::kTrueValueRootIndex, &done_checking, Label::kNear);
+    JumpIfRoot(object, Heap::kFalseValueRootIndex, &done_checking,
+               Label::kNear);
+    JumpIfRoot(object, Heap::kNullValueRootIndex, &done_checking, Label::kNear);
+    JumpIfRoot(object, Heap::kUndefinedValueRootIndex, &done_checking,
+               Label::kNear);
+
+    // Check for other primitives (String, Symbol and HeapNumber).
+    STATIC_ASSERT(LAST_PRIMITIVE_TYPE == ODDBALL_TYPE);
+    CmpObjectType(object, LAST_PRIMITIVE_TYPE, object);
+    j(below, &done_checking, Label::kNear);
+
+    // Check for JSReceivers.
+    CmpInstanceType(object, FIRST_JS_RECEIVER_TYPE);
+    Check(above_equal, kAPICallReturnedInvalidObject);
+
+    bind(&done_checking);
+    Pop(object);
+  }
+}
 
 Condition MacroAssembler::IsObjectStringType(Register heap_object,
                                              Register map,
                                              Register instance_type) {
   movp(map, FieldOperand(heap_object, HeapObject::kMapOffset));
   movzxbl(instance_type, FieldOperand(map, Map::kInstanceTypeOffset));
   STATIC_ASSERT(kNotStringTag != 0);
   testb(instance_type, Immediate(kIsNotStringMask));
   return zero;
 }
@@ skipping 1258 matching lines @@
   movl(rax, dividend);
   shrl(rax, Immediate(31));
   addl(rdx, rax);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64