wtf/SizeLimits.cpp

   1 /*
   2  * Copyright (C) 2010 Google Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions are
   6  * met:
   7  *
   8  *     * Redistributions of source code must retain the above copyright
   9  * notice, this list of conditions and the following disclaimer.
  10  *     * Redistributions in binary form must reproduce the above
  11  * copyright notice, this list of conditions and the following disclaimer
  12  * in the documentation and/or other materials provided with the
  13  * distribution.
  14  *     * Neither the name of Google Inc. nor the names of its
  15  * contributors may be used to endorse or promote products derived from
  16  * this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29  */
  30
  31 #include "config.h"
  32
  33 #include <wtf/Assertions.h>
  34 #include <wtf/CrossThreadRefCounted.h>
  35 #include <wtf/OwnPtr.h>
  36 #include <wtf/PassRefPtr.h>
  37 #include <wtf/RefCounted.h>
  38 #include <wtf/RefPtr.h>
  39 #include <wtf/Vector.h>
  40
  41 namespace WTF {
  42
  43 #ifndef NDEBUG
  44 struct StructWithIntAndTwoBools { int a; bool b; bool c; };
  45 static const size_t refCountedExtraDebugSize = sizeof(StructWithIntAndTwoBools) - sizeof(int);
  46 #else
  47 static const size_t refCountedExtraDebugSize = 0;
  48 #endif
  49
  50 COMPILE_ASSERT(sizeof(OwnPtr<int>) == sizeof(int*), OwnPtr_should_stay_small);
  51 COMPILE_ASSERT(sizeof(PassRefPtr<RefCounted<int> >) == sizeof(int*), PassRefPtr_should_stay_small);
  52 COMPILE_ASSERT(sizeof(RefCounted<int>) == sizeof(int) + refCountedExtraDebugSize, RefCounted_should_stay_small);
  53 COMPILE_ASSERT(sizeof(RefCountedCustomAllocated<int>) == sizeof(int) + refCountedExtraDebugSize, RefCountedCustomAllocated_should_stay_small);
  54 COMPILE_ASSERT(sizeof(RefPtr<RefCounted<int> >) == sizeof(int*), RefPtr_should_stay_small);
  55 COMPILE_ASSERT(sizeof(Vector<int>) == 3 * sizeof(int*), Vector_should_stay_small);
  56
  57 }