Throw on range error when creating a string via API.

src/api.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.
 
 #include "src/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 5419 matching lines @@
                                const Char* data,
                                String::NewStringType type,
                                int length) {
   i::Isolate* isolate = reinterpret_cast<internal::Isolate*>(v8_isolate);
   LOG_API(isolate, env);
   if (length == 0 && type != String::kUndetectableString) {
     return String::Empty(v8_isolate);
   }
   ENTER_V8(isolate);
   if (length == -1) length = StringLength(data);
   // We do not expect this to fail. Change this if it does.

[Jakob Kummerow, 2015/02/10 16:00:19]

nit: outdated comment

-  i::Handle<i::String> result = NewString(
-      isolate->factory(),
-      type,
-      i::Vector<const Char>(data, length)).ToHandleChecked();
+  EXCEPTION_PREAMBLE(isolate);
+  i::Handle<i::String> result;
+  has_pending_exception =
+      !NewString(isolate->factory(), type, i::Vector<const Char>(data, length))
+           .ToHandle(&result);
+  EXCEPTION_BAILOUT_CHECK(isolate, Local<String>());
   if (type == String::kUndetectableString) {
     result->MarkAsUndetectable();
   }
   return Utils::ToLocal(result);
 }
 
 }  // anonymous namespace
 
 
 Local<String> String::NewFromUtf8(Isolate* isolate,
@@ skipping 2285 matching lines @@
   Isolate* isolate = reinterpret_cast<Isolate*>(info.GetIsolate());
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 } }  // namespace v8::internal