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/*
* Copyright (C) 2015-2019 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 "RegisterSet.h"
namespace JSC { namespace B3 { namespace Air {
void handleCalleeSaves(Code& code)
{
RegisterSetBuilder usedCalleeSaves;
for (BasicBlock* block : code) {
for (Inst& inst : *block) {
inst.forEachTmpFast(
[&] (Tmp& tmp) {
// At first we just record all used regs.
usedCalleeSaves.add(tmp.reg(), IgnoreVectors);
});
if (inst.kind.opcode == Patch) {
usedCalleeSaves.merge(inst.extraClobberedRegs());
usedCalleeSaves.merge(inst.extraEarlyClobberedRegs());
}
}
}
handleCalleeSaves(code, WTFMove(usedCalleeSaves));
}
void handleCalleeSaves(Code& code, RegisterSetBuilder usedCalleeSaves)
{
// We filter to really get the callee saves.
usedCalleeSaves.filter(RegisterSetBuilder::calleeSaveRegisters());
usedCalleeSaves.filter(code.mutableRegs());
usedCalleeSaves.exclude(RegisterSetBuilder::stackRegisters()); // We don't need to save FP here.
#if CPU(ARM)
// See AirCode for a similar comment about why ARMv7 acts weird here.
// Essentially, we might at any point clobber this, and it is a callee-save.
// This should be fixed.
usedCalleeSaves.add(MacroAssembler::addressTempRegister, IgnoreVectors);
#endif
auto calleSavesToSave = usedCalleeSaves.buildAndValidate();
if (!calleSavesToSave.numberOfSetRegisters())
return;
RegisterAtOffsetList calleeSaveRegisters = RegisterAtOffsetList(calleSavesToSave);
size_t byteSize = 0;
for (const RegisterAtOffset& entry : calleeSaveRegisters)
byteSize = std::max(static_cast<size_t>(-entry.offset()), byteSize);
ASSERT(calleeSaveRegisters.sizeOfAreaInBytes() == byteSize);
code.setCalleeSaveRegisterAtOffsetList(
WTFMove(calleeSaveRegisters),
code.addStackSlot(byteSize, StackSlotKind::Locked));
}
} } } // namespace JSC::B3::Air
#endif // ENABLE(B3_JIT)
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