WebKit/Source/JavaScriptCore/jit/CallFrameShuffleData.cpp at main · WebKit/WebKit · GitHub

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#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 = RegisterSet::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();

// CPU registers are the same size as virtual registers

VirtualRegister saveSlot { saveSlotIndexInCPURegisters };

registers[entry.reg()]

= ValueRecovery::displacedInJSStack(saveSlot, DataFormatJS);

}

for (Reg reg = Reg::first(); reg <= Reg::last(); reg = reg.next()) {

if (!calleeSaveRegisters.contains(reg, IgnoreVectors))

continue;

if (registers[reg])

continue;

registers[reg] = ValueRecovery::inRegister(reg, DataFormatJS);

}

CallFrameShuffleData CallFrameShuffleData::createForBaselineOrLLIntTailCall(const OpTailCall& bytecode, unsigned numParameters)

{

CallFrameShuffleData shuffleData;

shuffleData.numPassedArgs = bytecode.m_argc;

shuffleData.numParameters = numParameters;

shuffleData.numberTagRegister = GPRInfo::numberTagRegister;

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);

}

shuffleData.callee = ValueRecovery::inGPR(BaselineJITRegisters::Call::calleeJSR.payloadGPR(), DataFormatJS);

shuffleData.setupCalleeSaveRegisters(&RegisterAtOffsetList::llintBaselineCalleeSaveRegisters());

shuffleData.shrinkToFit();

return shuffleData;

}

} // namespace JSC

#endif // ENABLE(JIT)

WebKit/Source/JavaScriptCore/jit/CallFrameShuffleData.cpp at main · WebKit/WebKit · GitHub

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