third_party/blink/renderer/platform/bindings/v8_binding_macros.h

/*
 * Copyright (C) 2010 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
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_V8_BINDING_MACROS_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_V8_BINDING_MACROS_H_

#include "third_party/blink/renderer/platform/wtf/assertions.h"
#include "v8/include/v8.h"

namespace blink {

// type is an instance of class template V8StringResource<>,
// but Mode argument varies; using type (not Mode) for consistency
// with other macros and ease of code generation
#define TOSTRING_VOID(type, var, value) \
  type var(value);                      \
  if (UNLIKELY(!var.Prepare()))         \
    return;

#define TOSTRING_DEFAULT(type, var, value, retVal) \
  type var(value);                                 \
  if (UNLIKELY(!var.Prepare()))                    \
    return retVal;

// Checks for a given v8::Value (value) whether it is an ArrayBufferView and
// below a certain size limit. If below the limit, memory is allocated on the
// stack to hold the actual payload. Keep the limit in sync with V8's
// typed_array_max_size.
#define allocateFlexibleArrayBufferViewStorage(value)            \
  (value->IsArrayBufferView() &&                                 \
           (value.As<v8::ArrayBufferView>()->ByteLength() <= 64) \
       ? alloca(value.As<v8::ArrayBufferView>()->ByteLength())   \
       : nullptr)

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_BINDINGS_V8_BINDING_MACROS_H_