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#pragma once
27
28#if ENABLE(B3_JIT)
29
30#include "AirArg.h"
31#include "B3AtomicValue.h"
32
33namespace JSC { namespace B3 {
34
35inline bool MemoryValue::isLegalOffsetImpl(int32_t offset) const
36{
37 // NOTE: This is inline because it constant-folds to true on x86!
38
39 // So far only X86 allows exotic loads to have an offset.
40 if (requiresSimpleAddr())
41 return !offset;
42
43 return Air::Arg::isValidAddrForm(offset, accessWidth());
44}
45
46inline bool MemoryValue::requiresSimpleAddr() const
47{
48 return !isX86() && isExotic();
49}
50
51inline Width MemoryValue::accessWidth() const
52{
53 switch (opcode()) {
54 case Load8Z:
55 case Load8S:
56 case Store8:
57 return Width8;
58 case Load16Z:
59 case Load16S:
60 case Store16:
61 return Width16;
62 case Load:
63 return widthForType(type());
64 case Store:
65 return widthForType(child(0)->type());
66 case AtomicWeakCAS:
67 case AtomicStrongCAS:
68 case AtomicXchgAdd:
69 case AtomicXchgAnd:
70 case AtomicXchgOr:
71 case AtomicXchgSub:
72 case AtomicXchgXor:
73 case AtomicXchg:
74 return as<AtomicValue>()->accessWidth();
75 default:
76 RELEASE_ASSERT_NOT_REACHED();
77 return Width8;
78 }
79}
80
81} } // namespace JSC::B3
82
83#endif // ENABLE(B3_JIT)
84
85