| // Copyright 2018 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef THIRD_PARTY_BLINK_RENDERER_CORE_STREAMS_RETAIN_WRAPPER_DURING_CONSTRUCTION_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_CORE_STREAMS_RETAIN_WRAPPER_DURING_CONSTRUCTION_H_ |
| |
| #include "third_party/blink/renderer/core/core_export.h" |
| |
| namespace blink { |
| |
| class ScriptState; |
| class ScriptWrappable; |
| |
| // Objects which |
| // a) directly or indirectly own V8 objects held via TraceWrapperV8References, |
| // and |
| // b) are constructed via the bindings |
| // need to call this function at the start of the constructor to ensure that a |
| // wrapper object exists for V8 to trace through. This ensures that the |
| // TraceWrapperV8Reference will not be collected even if a GC takes place during |
| // construction. |
| // |
| // This function posts a task containing a strong reference. The reference |
| // remains until the task is executed. This is slightly longer than necessary, |
| // but it shouldn't matter in practice. |
| // |
| // This function returns false if it fails. Usually this means the task runner |
| // is in the process of being destroyed. The caller must ensure that the |
| // reference is not used in this case. |
| // |
| // TODO(yhirano): Remove this once the unified GC is available. |
| bool CORE_EXPORT RetainWrapperDuringConstruction(ScriptWrappable*, |
| ScriptState*); |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_CORE_STREAMS_RETAIN_WRAPPER_DURING_CONSTRUCTION_H_ |
