[d8 worker] Fix regression when serializing very large arraybuffer

BUG=chromium:514081
R=jarin@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/1264723002

Cr-Commit-Position: refs/heads/master@{#29982}

src/d8.cc

@@ -2077,16 +2077,15 @@ bool Shell::SerializeValue(Isolate* isolate, Local<Value> value,
     } else {
       ArrayBuffer::Contents contents = array_buffer->GetContents();
       // Clone ArrayBuffer
-      if (contents.ByteLength() > i::kMaxUInt32) {
+      if (contents.ByteLength() > i::kMaxInt) {
         Throw(isolate, "ArrayBuffer is too big to clone");
         return false;
       }
 
-      int byte_length = static_cast<int>(contents.ByteLength());
+      int32_t byte_length = static_cast<int32_t>(contents.ByteLength());
       out_data->WriteTag(kSerializationTagArrayBuffer);
       out_data->Write(byte_length);
-      out_data->WriteMemory(contents.Data(),
-                            static_cast<int>(contents.ByteLength()));
+      out_data->WriteMemory(contents.Data(), byte_length);
     }
   } else if (value->IsSharedArrayBuffer()) {
     Local<SharedArrayBuffer> sab = Local<SharedArrayBuffer>::Cast(value);
@@ -2212,7 +2211,7 @@ MaybeLocal<Value> Shell::DeserializeValue(Isolate* isolate,
       break;
     }
     case kSerializationTagArrayBuffer: {
-      int byte_length = data.Read<int>(offset);
+      int32_t byte_length = data.Read<int32_t>(offset);
       Local<ArrayBuffer> array_buffer = ArrayBuffer::New(isolate, byte_length);
       ArrayBuffer::Contents contents = array_buffer->GetContents();
       DCHECK(static_cast<size_t>(byte_length) == contents.ByteLength());

test/mjsunit/regress/regress-crbug-514081.js

+// Copyright 2015 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 (this.Worker) {
+  var __v_7 = new Worker('onmessage = function() {};');
+  try {
+    var ab = new ArrayBuffer(2147483648);
+    // If creating the ArrayBuffer succeeded, then postMessage should fail.
+    assertThrows(function() { __v_7.postMessage(ab); });
+  } catch (e) {
+    // Creating the ArrayBuffer failed.
+    assertInstanceof(e, RangeError);
+  }
+}