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(ASSEMBLER)
29
30#include "MacroAssembler.h"
31
32namespace JSC {
33
34class AllowMacroScratchRegisterUsageIf {
35public:
36 AllowMacroScratchRegisterUsageIf(MacroAssembler& masm, bool allowIfTrue)
37 : m_masm(masm)
38 , m_allowIfTrue(allowIfTrue)
39 , m_oldValueOfAllowScratchRegister(masm.m_allowScratchRegister)
40 {
41 if (m_allowIfTrue) {
42#if CPU(ARM64)
43 if (!m_oldValueOfAllowScratchRegister)
44 m_masm.invalidateAllTempRegisters();
45#endif
46 masm.m_allowScratchRegister = true;
47 }
48 }
49
50 ~AllowMacroScratchRegisterUsageIf()
51 {
52 if (m_allowIfTrue)
53 m_masm.m_allowScratchRegister = m_oldValueOfAllowScratchRegister;
54 }
55
56private:
57 MacroAssembler& m_masm;
58 bool m_allowIfTrue;
59 bool m_oldValueOfAllowScratchRegister;
60};
61
62} // namespace JSC
63
64#endif // ENABLE(ASSEMBLER)
65