1/*
2 * Copyright (C) 2017 Apple 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
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "HeapCellType.h"
28
29#include "JSCInlines.h"
30#include "MarkedBlockInlines.h"
31
32namespace JSC {
33
34// Writing it this way ensures that when you pass this as a functor, the callee is specialized for
35// this callback. If you wrote this as a normal function then the callee would be specialized for
36// the function's type and it would have indirect calls to that function. And unlike a lambda, it's
37// possible to mark this ALWAYS_INLINE.
38struct DefaultDestroyFunc {
39 ALWAYS_INLINE void operator()(VM& vm, JSCell* cell) const
40 {
41 ASSERT(cell->structureID());
42 Structure* structure = cell->structure(vm);
43 ASSERT(structure->typeInfo().structureIsImmortal());
44 const ClassInfo* classInfo = structure->classInfo();
45 MethodTable::DestroyFunctionPtr destroy = classInfo->methodTable.destroy;
46 destroy(cell);
47 }
48};
49
50HeapCellType::HeapCellType(CellAttributes attributes)
51 : m_attributes(attributes)
52{
53}
54
55HeapCellType::~HeapCellType()
56{
57}
58
59void HeapCellType::finishSweep(MarkedBlock::Handle& block, FreeList* freeList)
60{
61 block.finishSweepKnowingHeapCellType(freeList, DefaultDestroyFunc());
62}
63
64void HeapCellType::destroy(VM& vm, JSCell* cell)
65{
66 DefaultDestroyFunc()(vm, cell);
67}
68
69} // namespace JSC
70
71