1/*
2 * Copyright (C) 2016-2017 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
28#include "WasmFormat.h"
29
30#if ENABLE(WEBASSEMBLY)
31
32#include "WasmMemory.h"
33#include <wtf/CheckedArithmetic.h>
34#include <wtf/FastMalloc.h>
35
36namespace JSC { namespace Wasm {
37
38Segment* Segment::create(I32InitExpr offset, uint32_t sizeInBytes)
39{
40 Checked<uint32_t, RecordOverflow> totalBytesChecked = sizeInBytes;
41 totalBytesChecked += sizeof(Segment);
42 uint32_t totalBytes;
43 if (totalBytesChecked.safeGet(totalBytes) == CheckedState::DidOverflow)
44 return nullptr;
45 auto allocated = tryFastCalloc(totalBytes, 1);
46 Segment* segment;
47 if (!allocated.getValue(segment))
48 return nullptr;
49 segment->offset = offset;
50 segment->sizeInBytes = sizeInBytes;
51 return segment;
52}
53
54void Segment::destroy(Segment *segment)
55{
56 fastFree(segment);
57}
58
59Segment::Ptr Segment::adoptPtr(Segment* segment)
60{
61 return Ptr(segment, &Segment::destroy);
62}
63
64String makeString(const Name& characters)
65{
66 String result = String::fromUTF8(characters);
67 ASSERT(result);
68 return result;
69}
70
71} } // namespace JSC::Wasm
72
73#endif // ENABLE(WEBASSEMBLY)
74