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/*
* Copyright (C) 2015-2016 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "AirHandleCalleeSaves.h"
#if ENABLE(B3_JIT)
#include "AirCode.h"
#include "AirInstInlines.h"
#include "AirPhaseScope.h"
namespace JSC { namespace B3 { namespace Air {
void handleCalleeSaves(Code& code)
{
PhaseScope phaseScope(code, "handleCalleeSaves");
RegisterSet usedCalleeSaves;
for (BasicBlock* block : code) {
for (Inst& inst : *block) {
inst.forEachTmpFast(
[&] (Tmp& tmp) {
// At first we just record all used regs.
usedCalleeSaves.set(tmp.reg());
});
if (inst.opcode == Patch)
usedCalleeSaves.merge(inst.extraClobberedRegs());
}
}
// Now we filter to really get the callee saves.
usedCalleeSaves.filter(RegisterSet::calleeSaveRegisters());
usedCalleeSaves.exclude(RegisterSet::stackRegisters()); // We don't need to save FP here.
if (!usedCalleeSaves.numberOfSetRegisters())
return;
code.calleeSaveRegisters() = RegisterAtOffsetList(usedCalleeSaves);
size_t byteSize = 0;
for (const RegisterAtOffset& entry : code.calleeSaveRegisters())
byteSize = std::max(static_cast<size_t>(-entry.offset()), byteSize);
StackSlot* savesArea = code.addStackSlot(byteSize, StackSlotKind::Locked);
// This is a bit weird since we could have already pinned a different stack slot to this
// area. Also, our runtime does not require us to pin the saves area. Maybe we shouldn't pin it?
savesArea->setOffsetFromFP(-byteSize);
}
} } } // namespace JSC::B3::Air
#endif // ENABLE(B3_JIT)
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