1/*
2 * Copyright (C) 2015-2019 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#include "AirHandleCalleeSaves.h"
28
29#if ENABLE(B3_JIT)
30
31#include "AirCode.h"
32#include "AirInstInlines.h"
33#include "RegisterSet.h"
34
35namespace JSC { namespace B3 { namespace Air {
36
37void handleCalleeSaves(Code& code)
38{
39 RegisterSet usedCalleeSaves;
40
41 for (BasicBlock* block : code) {
42 for (Inst& inst : *block) {
43 inst.forEachTmpFast(
44 [&] (Tmp& tmp) {
45 // At first we just record all used regs.
46 usedCalleeSaves.set(tmp.reg());
47 });
48
49 if (inst.kind.opcode == Patch) {
50 usedCalleeSaves.merge(inst.extraClobberedRegs());
51 usedCalleeSaves.merge(inst.extraEarlyClobberedRegs());
52 }
53 }
54 }
55
56 handleCalleeSaves(code, WTFMove(usedCalleeSaves));
57}
58
59void handleCalleeSaves(Code& code, RegisterSet usedCalleeSaves)
60{
61 // We filter to really get the callee saves.
62 usedCalleeSaves.filter(RegisterSet::calleeSaveRegisters());
63 usedCalleeSaves.filter(code.mutableRegs());
64 usedCalleeSaves.exclude(RegisterSet::stackRegisters()); // We don't need to save FP here.
65
66 if (!usedCalleeSaves.numberOfSetRegisters())
67 return;
68
69 RegisterAtOffsetList calleeSaveRegisters = RegisterAtOffsetList(usedCalleeSaves);
70
71 size_t byteSize = 0;
72 for (const RegisterAtOffset& entry : calleeSaveRegisters)
73 byteSize = std::max(static_cast<size_t>(-entry.offset()), byteSize);
74
75 code.setCalleeSaveRegisterAtOffsetList(
76 WTFMove(calleeSaveRegisters),
77 code.addStackSlot(byteSize, StackSlotKind::Locked));
78}
79
80} } } // namespace JSC::B3::Air
81
82#endif // ENABLE(B3_JIT)
83