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/*
* Copyright (C) 2015-2023 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 "CallFrameShuffleData.h"
#if ENABLE(JIT)
#include "BaselineJITRegisters.h"
#include "BytecodeStructs.h"
#include "CodeBlock.h"
#include "RegisterAtOffsetList.h"
#include <wtf/TZoneMallocInlines.h>
namespace JSC {
WTF_MAKE_TZONE_ALLOCATED_IMPL(CallFrameShuffleData);
void CallFrameShuffleData::setupCalleeSaveRegisters(const RegisterAtOffsetList* registerSaveLocations)
{
auto calleeSaveRegisters = RegisterSetBuilder::vmCalleeSaveRegisters();
for (size_t i = 0; i < registerSaveLocations->registerCount(); ++i) {
RegisterAtOffset entry { registerSaveLocations->at(i) };
if (!calleeSaveRegisters.contains(entry.reg(), IgnoreVectors))
continue;
int saveSlotIndexInCPURegisters = entry.offsetAsIndex();
#if USE(JSVALUE64)
// CPU registers are the same size as virtual registers
VirtualRegister saveSlot { saveSlotIndexInCPURegisters };
registers[entry.reg()]
= ValueRecovery::displacedInJSStack(saveSlot, DataFormatJS);
#elif USE(JSVALUE32_64)
// On 32-bit architectures, 2 callee saved GPRs may be packed into the same slot
if (entry.reg().isGPR()) {
static_assert(!PayloadOffset || !TagOffset);
static_assert(PayloadOffset == 4 || TagOffset == 4);
bool inTag = (saveSlotIndexInCPURegisters & 1) == !!TagOffset;
if (saveSlotIndexInCPURegisters < 0)
saveSlotIndexInCPURegisters -= 1; // Round towards -inf
VirtualRegister saveSlot { saveSlotIndexInCPURegisters / 2 };
registers[entry.reg()] = ValueRecovery::calleeSaveGPRDisplacedInJSStack(saveSlot, inTag);
} else {
ASSERT(!(saveSlotIndexInCPURegisters & 1)); // Should be at an even offset
VirtualRegister saveSlot { saveSlotIndexInCPURegisters / 2 };
registers[entry.reg()] = ValueRecovery::displacedInJSStack(saveSlot, DataFormatDouble);
}
#endif
}
for (Reg reg = Reg::first(); reg <= Reg::last(); reg = reg.next()) {
if (!calleeSaveRegisters.contains(reg, IgnoreVectors))
continue;
if (registers[reg])
continue;
#if USE(JSVALUE64)
registers[reg] = ValueRecovery::inRegister(reg, DataFormatJS);
#elif USE(JSVALUE32_64)
registers[reg] = ValueRecovery::inRegister(reg, reg.isGPR() ? DataFormatInt32 : DataFormatDouble);
#endif
}
}
CallFrameShuffleData CallFrameShuffleData::createForBaselineOrLLIntTailCall(const OpTailCall& bytecode, unsigned numParameters)
{
CallFrameShuffleData shuffleData;
shuffleData.numPassedArgs = bytecode.m_argc;
shuffleData.numParameters = numParameters;
#if USE(JSVALUE64)
shuffleData.numberTagRegister = GPRInfo::numberTagRegister;
#endif
shuffleData.numLocals = bytecode.m_argv - sizeof(CallerFrameAndPC) / sizeof(Register);
shuffleData.args.grow(bytecode.m_argc);
for (unsigned i = 0; i < bytecode.m_argc; ++i) {
shuffleData.args[i] =
ValueRecovery::displacedInJSStack(
virtualRegisterForArgumentIncludingThis(i) - bytecode.m_argv,
DataFormatJS);
}
#if USE(JSVALUE64)
shuffleData.callee = ValueRecovery::inGPR(BaselineJITRegisters::Call::calleeJSR.payloadGPR(), DataFormatJS);
#elif USE(JSVALUE32_64)
shuffleData.callee = ValueRecovery::inPair(BaselineJITRegisters::Call::calleeJSR.tagGPR(), BaselineJITRegisters::Call::calleeJSR.payloadGPR());
#endif
shuffleData.setupCalleeSaveRegisters(&RegisterAtOffsetList::llintBaselineCalleeSaveRegisters());
shuffleData.shrinkToFit();
return shuffleData;
}
} // namespace JSC
#endif // ENABLE(JIT)
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