bindings: Use V8 MaybeLocal APIs in V8DeviceMotionEventCustom

Source/bindings/modules/v8/custom/V8DeviceMotionEventCustom.cpp

 /*
  * Copyright (C) 2010 Apple Inc. 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
@@ skipping 16 matching lines @@
 #include "bindings/modules/v8/V8DeviceMotionEvent.h"
 
 #include "bindings/core/v8/V8Binding.h"
 #include "modules/device_orientation/DeviceMotionData.h"
 #include <v8.h>
 
 namespace blink {
 
 namespace {
 
-DeviceMotionData::Acceleration* readAccelerationArgument(v8::Local<v8::Value> value, v8::Isolate* isolate)
+DeviceMotionData::Acceleration* readAccelerationArgument(v8::Local<v8::Value> value, v8::Isolate* isolate, ExceptionState& exceptionState)
 {
     if (isUndefinedOrNull(value))
         return nullptr;
 
-    // Given the test above, this will always yield an object.
-    v8::Local<v8::Object> object = value->ToObject(isolate);
+    v8::Local<v8::Object> object;
+    CALL_V8_MAYBELOCAL(object, isolate, value->ToObject(isolate->GetCurrentContext()), exceptionState, nullptr);
 
     v8::Local<v8::Value> xValue = object->Get(v8AtomicString(isolate, "x"));
     if (xValue.IsEmpty())
         return nullptr;
     bool canProvideX = !isUndefinedOrNull(xValue);
     double x = xValue->NumberValue();
 
     v8::Local<v8::Value> yValue = object->Get(v8AtomicString(isolate, "y"));
     if (yValue.IsEmpty())
         return nullptr;
     bool canProvideY = !isUndefinedOrNull(yValue);
     double y = yValue->NumberValue();
 
     v8::Local<v8::Value> zValue = object->Get(v8AtomicString(isolate, "z"));
     if (zValue.IsEmpty())
         return nullptr;
     bool canProvideZ = !isUndefinedOrNull(zValue);
     double z = zValue->NumberValue();
 
     if (!canProvideX && !canProvideY && !canProvideZ)
         return nullptr;
 
     return DeviceMotionData::Acceleration::create(canProvideX, x, canProvideY, y, canProvideZ, z);
 }
 
-DeviceMotionData::RotationRate* readRotationRateArgument(v8::Local<v8::Value> value, v8::Isolate* isolate)
+DeviceMotionData::RotationRate* readRotationRateArgument(v8::Local<v8::Value> value, v8::Isolate* isolate, ExceptionState& exceptionState)
 {
     if (isUndefinedOrNull(value))
         return nullptr;
 
-    // Given the test above, this will always yield an object.
-    v8::Local<v8::Object> object = value->ToObject(isolate);
+    v8::Local<v8::Object> object;
+    CALL_V8_MAYBELOCAL(object, isolate, value->ToObject(isolate->GetCurrentContext()), exceptionState, nullptr);
 
     v8::Local<v8::Value> alphaValue = object->Get(v8AtomicString(isolate, "alpha"));
     if (alphaValue.IsEmpty())
         return nullptr;
     bool canProvideAlpha = !isUndefinedOrNull(alphaValue);
     double alpha = alphaValue->NumberValue();
 
     v8::Local<v8::Value> betaValue = object->Get(v8AtomicString(isolate, "beta"));
     if (betaValue.IsEmpty())
         return nullptr;
@@ skipping 17 matching lines @@
 void V8DeviceMotionEvent::initDeviceMotionEventMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info)
 {
     ExceptionState exceptionState(ExceptionState::ExecutionContext, "initDeviceMotionEvent", "DeviceMotionEvent", info.Holder(), info.GetIsolate());
     DeviceMotionEvent* impl = V8DeviceMotionEvent::toImpl(info.Holder());
     v8::Isolate* isolate = info.GetIsolate();
     V8StringResource<> type(info[0]);
     if (!type.prepare())
         return;
     bool bubbles = info[1]->BooleanValue();
     bool cancelable = info[2]->BooleanValue();
-    DeviceMotionData::Acceleration* acceleration = readAccelerationArgument(info[3], isolate);
-    DeviceMotionData::Acceleration* accelerationIncludingGravity = readAccelerationArgument(info[4], isolate);
-    DeviceMotionData::RotationRate* rotationRate = readRotationRateArgument(info[5], isolate);
+    DeviceMotionData::Acceleration* acceleration = readAccelerationArgument(info[3], isolate, exceptionState);
+    DeviceMotionData::Acceleration* accelerationIncludingGravity = readAccelerationArgument(info[4], isolate, exceptionState);
+    DeviceMotionData::RotationRate* rotationRate = readRotationRateArgument(info[5], isolate, exceptionState);
+    if (exceptionState.throwIfNeeded())
+        return;
+
     bool intervalProvided = !isUndefinedOrNull(info[6]);
     double interval = 0;
     if (intervalProvided) {
         interval = toRestrictedDouble(info[6], exceptionState);
         if (exceptionState.throwIfNeeded())
             return;
     }
     DeviceMotionData* deviceMotionData = DeviceMotionData::create(acceleration, accelerationIncludingGravity, rotationRate, intervalProvided, interval);
     impl->initDeviceMotionEvent(type, bubbles, cancelable, deviceMotionData);
 }
 
 } // namespace blink