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/OwnPtr.h"
35#include "wtf/PassRefPtr.h"
36#include "wtf/RefCounted.h"
37#include "wtf/RefPtr.h"
38#include "wtf/ThreadRestrictionVerifier.h"
39#include "wtf/Vector.h"
40#include "wtf/text/AtomicString.h"
41#include "wtf/text/WTFString.h"
42
43namespace WTF {
44
45#if ENABLE(ASSERT) || ENABLE(SECURITY_ASSERT)
46// The debug/assertion version may get bigger.
47struct SameSizeAsRefCounted {
48    int a;
49#if ENABLE(SECURITY_ASSERT)
50    bool b;
51#endif
52#if ENABLE(ASSERT)
53    bool c;
54    ThreadRestrictionVerifier d;
55#endif
56};
57#else
58struct SameSizeAsRefCounted {
59    int a;
60    // Don't add anything here because this should stay small.
61};
62#endif
63template<typename T, unsigned inlineCapacity = 0>
64struct SameSizeAsVectorWithInlineCapacity;
65
66template<typename T>
67struct SameSizeAsVectorWithInlineCapacity<T, 0> {
68    void* bufferPointer;
69    unsigned capacity;
70    unsigned size;
71};
72
73template<typename T, unsigned inlineCapacity>
74struct SameSizeAsVectorWithInlineCapacity {
75    SameSizeAsVectorWithInlineCapacity<T, 0> baseCapacity;
76    AlignedBuffer<inlineCapacity * sizeof(T), WTF_ALIGN_OF(T)> inlineBuffer;
77};
78
79COMPILE_ASSERT(sizeof(OwnPtr<int>) == sizeof(int*), OwnPtr_should_stay_small);
80COMPILE_ASSERT(sizeof(PassRefPtr<RefCounted<int> >) == sizeof(int*), PassRefPtr_should_stay_small);
81COMPILE_ASSERT(sizeof(RefCounted<int>) == sizeof(SameSizeAsRefCounted), RefCounted_should_stay_small);
82COMPILE_ASSERT(sizeof(RefPtr<RefCounted<int> >) == sizeof(int*), RefPtr_should_stay_small);
83COMPILE_ASSERT(sizeof(String) == sizeof(int*), String_should_stay_small);
84COMPILE_ASSERT(sizeof(AtomicString) == sizeof(String), AtomicString_should_stay_small);
85COMPILE_ASSERT(sizeof(Vector<int>) == sizeof(SameSizeAsVectorWithInlineCapacity<int>), Vector_should_stay_small);
86COMPILE_ASSERT(sizeof(Vector<int, 1>) == sizeof(SameSizeAsVectorWithInlineCapacity<int, 1>), Vector_should_stay_small);
87COMPILE_ASSERT(sizeof(Vector<int, 2>) == sizeof(SameSizeAsVectorWithInlineCapacity<int, 2>), Vector_should_stay_small);
88COMPILE_ASSERT(sizeof(Vector<int, 3>) == sizeof(SameSizeAsVectorWithInlineCapacity<int, 3>), Vector_should_stay_small);
89}
90