Return MaybeHandle from Invoke.

src/json-stringifier.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 360 matching lines @@
   Handle<Object> fun;
   ASSIGN_RETURN_ON_EXCEPTION(
       isolate_, fun,
       Object::GetProperty(object, object, &lookup, tojson_string_, &attr),
       Object);
   if (!fun->IsJSFunction()) return object;
 
   // Call toJSON function.
   if (key->IsSmi()) key = factory_->NumberToString(key);
   Handle<Object> argv[] = { key };
-  bool has_exception = false;
   HandleScope scope(isolate_);
-  object = Execution::Call(isolate_, fun, object, 1, argv, &has_exception);
-  // Return empty handle to signal an exception.
-  if (has_exception) return MaybeHandle<Object>();
+  ASSIGN_RETURN_ON_EXCEPTION(
+      isolate_, object,
+      Execution::Call(isolate_, fun, object, 1, argv),
+      Object);
   return scope.CloseAndEscape(object);
 }
 
 
 BasicJsonStringifier::Result BasicJsonStringifier::StackPush(
     Handle<Object> object) {
   StackLimitCheck check(isolate_);
   if (check.HasOverflowed()) return STACK_OVERFLOW;
 
   int length = Smi::cast(stack_->length())->value();
@@ skipping 83 matching lines @@
 BasicJsonStringifier::Result BasicJsonStringifier::SerializeGeneric(
     Handle<Object> object,
     Handle<Object> key,
     bool deferred_comma,
     bool deferred_key) {
   Handle<JSObject> builtins(isolate_->native_context()->builtins());
   Handle<JSFunction> builtin = Handle<JSFunction>::cast(
       GetProperty(builtins, "JSONSerializeAdapter").ToHandleChecked());
 
   Handle<Object> argv[] = { key, object };
-  bool has_exception = false;
-  Handle<Object> result =
-      Execution::Call(isolate_, builtin, object, 2, argv, &has_exception);
-  if (has_exception) return EXCEPTION;
+  Handle<Object> result;
+  ASSIGN_RETURN_ON_EXCEPTION_VALUE(
+      isolate_, result,
+      Execution::Call(isolate_, builtin, object, 2, argv),
+      EXCEPTION);
   if (result->IsUndefined()) return UNCHANGED;
   if (deferred_key) {
     if (key->IsSmi()) key = factory_->NumberToString(key);
     SerializeDeferredKey(deferred_comma, key);
   }
 
   Handle<String> result_string = Handle<String>::cast(result);
   // Shrink current part, attach it to the accumulator, also attach the result
   // string to the accumulator, and allocate a new part.
   ShrinkCurrentPart();  // Shrink.
   part_length_ = kInitialPartLength;  // Allocate conservatively.
   Extend();             // Attach current part and allocate new part.
   // Attach result string to the accumulator.
   Handle<String> cons;
   ASSIGN_RETURN_ON_EXCEPTION_VALUE(
       isolate_, cons,
       factory_->NewConsString(accumulator(), result_string),
       EXCEPTION);
   set_accumulator(cons);
   return SUCCESS;
 }
 
 
 BasicJsonStringifier::Result BasicJsonStringifier::SerializeJSValue(
     Handle<JSValue> object) {
-  bool has_exception = false;
   String* class_name = object->class_name();
   if (class_name == isolate_->heap()->String_string()) {
-    Handle<Object> value =
-        Execution::ToString(isolate_, object, &has_exception);
-    if (has_exception) return EXCEPTION;
+    Handle<Object> value;
+    ASSIGN_RETURN_ON_EXCEPTION_VALUE(
+        isolate_, value, Execution::ToString(isolate_, object), EXCEPTION);
     SerializeString(Handle<String>::cast(value));
   } else if (class_name == isolate_->heap()->Number_string()) {
-    Handle<Object> value =
-        Execution::ToNumber(isolate_, object, &has_exception);
-    if (has_exception) return EXCEPTION;
+    Handle<Object> value;
+    ASSIGN_RETURN_ON_EXCEPTION_VALUE(
+        isolate_, value, Execution::ToNumber(isolate_, object), EXCEPTION);
     if (value->IsSmi()) return SerializeSmi(Smi::cast(*value));
     SerializeHeapNumber(Handle<HeapNumber>::cast(value));
   } else {
     ASSERT(class_name == isolate_->heap()->Boolean_string());
     Object* value = JSValue::cast(*object)->value();
     ASSERT(value->IsBoolean());
     AppendAscii(value->IsTrue() ? "true" : "false");
   }
   return SUCCESS;
 }
@@ skipping 355 matching lines @@
       SerializeString_<false, uint8_t>(object);
     } else {
       SerializeString_<false, uc16>(object);
     }
   }
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_JSON_STRINGIFIER_H_