1/*
2 * Copyright (C) 2013-2015 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(ASSEMBLER)
29
30#include "Reg.h"
31#include <wtf/PrintStream.h>
32
33namespace JSC {
34
35class RegisterAtOffset {
36public:
37 RegisterAtOffset()
38 : m_offset(0)
39 {
40 }
41
42 RegisterAtOffset(Reg reg, ptrdiff_t offset)
43 : m_reg(reg)
44 , m_offset(offset)
45 {
46 }
47
48 bool operator!() const { return !m_reg; }
49
50 Reg reg() const { return m_reg; }
51 ptrdiff_t offset() const { return m_offset; }
52 int offsetAsIndex() const { ASSERT(!(offset() % sizeof(CPURegister))); return offset() / static_cast<int>(sizeof(CPURegister)); }
53
54 bool operator==(const RegisterAtOffset& other) const
55 {
56 return reg() == other.reg() && offset() == other.offset();
57 }
58
59 bool operator<(const RegisterAtOffset& other) const
60 {
61 if (reg() != other.reg())
62 return reg() < other.reg();
63 return offset() < other.offset();
64 }
65
66 static Reg getReg(RegisterAtOffset* value) { return value->reg(); }
67
68 void dump(PrintStream& out) const;
69
70private:
71 Reg m_reg;
72 ptrdiff_t m_offset : (sizeof(ptrdiff_t) - sizeof(Reg)) * CHAR_BIT;
73};
74
75} // namespace JSC
76
77#endif // ENABLE(ASSEMBLER)
78