Use v8::TryCatch in toImplSequence

third_party/WebKit/Source/bindings/core/v8/V8Binding.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Google 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
@@ skipping 879 matching lines @@
   return true;
 }
 
 v8::Local<v8::Function> getBoundFunction(v8::Local<v8::Function> function) {
   v8::Local<v8::Value> boundFunction = function->GetBoundFunction();
   return boundFunction->IsFunction()
              ? v8::Local<v8::Function>::Cast(boundFunction)
              : function;
 }
 
-v8::MaybeLocal<v8::Object> getEsIterator(v8::Isolate* isolate,
-                                         v8::Local<v8::Object> object,
-                                         ExceptionState& exceptionState) {
+v8::Local<v8::Object> getEsIterator(v8::Isolate* isolate,
+                                    v8::Local<v8::Object> object,
+                                    ExceptionState& exceptionState) {
+  v8::TryCatch block(isolate);
   v8::Local<v8::Context> context = isolate->GetCurrentContext();
   v8::Local<v8::Value> iteratorGetter;
   if (!object->Get(context, v8::Symbol::GetIterator(isolate))
-           .ToLocal(&iteratorGetter))
-    return v8::MaybeLocal<v8::Object>();
+           .ToLocal(&iteratorGetter)) {
+    exceptionState.rethrowV8Exception(block.Exception());
+    return v8::Local<v8::Object>();
+  }
   if (!iteratorGetter->IsFunction()) {
     exceptionState.throwTypeError("Iterator getter is not callable.");
-    return v8::MaybeLocal<v8::Object>();
+    return v8::Local<v8::Object>();
   }
 
   v8::Local<v8::Function> getterFunction = iteratorGetter.As<v8::Function>();
   v8::Local<v8::Value> iterator;
   if (!V8ScriptRunner::callFunction(getterFunction, toExecutionContext(context),
                                     object, 0, nullptr, isolate)
-           .ToLocal(&iterator))
-    return v8::MaybeLocal<v8::Object>();
+           .ToLocal(&iterator)) {
+    exceptionState.rethrowV8Exception(block.Exception());
+    return v8::Local<v8::Object>();
+  }
   if (!iterator->IsObject()) {
     exceptionState.throwTypeError("Iterator is not an object.");
-    return v8::MaybeLocal<v8::Object>();
+    return v8::Local<v8::Object>();
   }
-  return v8::MaybeLocal<v8::Object>(iterator.As<v8::Object>());
+  return iterator.As<v8::Object>();
 }
 
 bool addHiddenValueToArray(v8::Isolate* isolate,
                            v8::Local<v8::Object> object,
                            v8::Local<v8::Value> value,
                            int arrayIndex) {
   ASSERT(!value.IsEmpty());
   v8::Local<v8::Value> arrayValue = object->GetInternalField(arrayIndex);
   if (arrayValue->IsNull() || arrayValue->IsUndefined()) {
     arrayValue = v8::Array::New(isolate);
@@ skipping 59 matching lines @@
 v8::Local<v8::Value> freezeV8Object(v8::Local<v8::Value> value,
                                     v8::Isolate* isolate) {
   value.As<v8::Object>()
       ->SetIntegrityLevel(isolate->GetCurrentContext(),
                           v8::IntegrityLevel::kFrozen)
       .ToChecked();
   return value;
 }
 
 }  // namespace blink