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#pragma once
27
28#if ENABLE(WEBASSEMBLY)
29
30#include "GPRInfo.h"
31#include "RegisterSet.h"
32#include "WasmMemory.h"
33#include "WasmPageCount.h"
34
35#include <wtf/Forward.h>
36#include <wtf/Ref.h>
37#include <wtf/Vector.h>
38
39namespace JSC { namespace Wasm {
40
41struct PinnedSizeRegisterInfo {
42 GPRReg sizeRegister;
43 unsigned sizeOffset;
44};
45
46class PinnedRegisterInfo {
47public:
48 PinnedRegisterInfo(GPRReg, GPRReg, GPRReg);
49
50 static const PinnedRegisterInfo& get();
51
52 RegisterSet toSave(MemoryMode mode) const
53 {
54 RegisterSet result;
55 result.set(baseMemoryPointer);
56 if (wasmContextInstancePointer != InvalidGPRReg)
57 result.set(wasmContextInstancePointer);
58 if (mode != MemoryMode::Signaling)
59 result.set(sizeRegister);
60 return result;
61 }
62
63 GPRReg sizeRegister;
64 GPRReg baseMemoryPointer;
65 GPRReg wasmContextInstancePointer;
66};
67
68class MemoryInformation {
69public:
70 MemoryInformation()
71 {
72 ASSERT(!*this);
73 }
74
75 MemoryInformation(PageCount initial, PageCount maximum, bool isImport);
76
77 PageCount initial() const { return m_initial; }
78 PageCount maximum() const { return m_maximum; }
79 bool isImport() const { return m_isImport; }
80
81 explicit operator bool() const { return !!m_initial; }
82
83private:
84 PageCount m_initial { };
85 PageCount m_maximum { };
86 bool m_isImport { false };
87};
88
89} } // namespace JSC::Wasm
90
91#endif // ENABLE(WEBASSEMBLY)
92