WebKit/Source/JavaScriptCore/b3/B3CheckSpecial.cpp at main · WebKit/WebKit · GitHub

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* 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 "B3CheckSpecial.h"

#if ENABLE(B3_JIT)

#include "AirGenerationContext.h"

#include "AirInstInlines.h"

#include "B3StackmapGenerationParams.h"

#include "B3ValueInlines.h"

#include "CCallHelpers.h"

#include <wtf/TZoneMallocInlines.h>

namespace JSC { namespace B3 {

WTF_MAKE_SEQUESTERED_ARENA_ALLOCATED_IMPL(CheckSpecial);

using Inst = Air::Inst;

using Arg = Air::Arg;

using GenerationContext = Air::GenerationContext;

namespace {

unsigned NODELETE numB3Args(Kind kind)

{

switch (kind.opcode()) {

case CheckAdd:

case CheckSub:

case CheckMul:

return 2;

case Check:

return 1;

default:

RELEASE_ASSERT_NOT_REACHED();

return 0;

}

unsigned NODELETE numB3Args(Value* value)

{

return numB3Args(value->kind());

}

unsigned NODELETE numB3Args(Inst& inst)

{

return numB3Args(inst.origin);

}

} // anonymous namespace

CheckSpecial::Key::Key(const Inst& inst)

{

m_kind = inst.kind;

m_numArgs = inst.args().size();

m_stackmapRole = SameAsRep;

}

void CheckSpecial::Key::dump(PrintStream& out) const

{

out.print(m_kind, "(", m_numArgs, ",", m_stackmapRole, ")");

}

CheckSpecial::CheckSpecial(Air::Kind kind, unsigned numArgs, RoleMode stackmapRole)

: m_checkKind(kind)

, m_stackmapRole(stackmapRole)

, m_numCheckArgs(numArgs)

{

ASSERT(isDefinitelyTerminal(kind.opcode));

}

CheckSpecial::CheckSpecial(const CheckSpecial::Key& key)

: CheckSpecial(key.kind(), key.numArgs(), key.stackmapRole())

{

}

CheckSpecial::~CheckSpecial() = default;

Inst CheckSpecial::hiddenBranch(const Inst& inst) const

{

Vector<Arg, 8> args;

args.appendUsingFunctor(m_numCheckArgs, [&](size_t i) {

return inst.args()[i + 1];

});

Inst hiddenBranch(m_checkKind, inst.origin, WTF::move(args));

ASSERT(hiddenBranch.isTerminal());

return hiddenBranch;

}

void CheckSpecial::forEachArg(Inst& inst, const ScopedLambda<Inst::EachArgCallback>& callback)

{

using namespace Air;

std::optional<Width> optionalDefArgWidth;

Inst hidden = hiddenBranch(inst);

hidden.forEachArg(

[&] (Arg& arg, Arg::Role role, Bank bank, Width width) {

if (Arg::isAnyDef(role) && role != Arg::Scratch) {

ASSERT(!optionalDefArgWidth); // There can only be one Def'ed arg.

optionalDefArgWidth = width;

}

unsigned index = &arg - &hidden.args()[0];

callback(inst.args()[1 + index], role, bank, width);

});

std::optional<unsigned> firstRecoverableIndex;

switch (m_checkKind.opcode) {

case BranchAdd32:

case BranchAdd64:

firstRecoverableIndex = 1;

break;

default:

break;

}

forEachArgImpl(numB3Args(inst), m_numCheckArgs + 1, inst, m_stackmapRole, firstRecoverableIndex, callback, optionalDefArgWidth);

}

bool CheckSpecial::isValid(Inst& inst)

{

return hiddenBranch(inst).isValidForm()

&& isValidImpl(numB3Args(inst), m_numCheckArgs + 1, inst)

&& inst.args().size() - m_numCheckArgs - 1 == inst.origin->numChildren() - numB3Args(inst);

}

bool CheckSpecial::admitsStack(Inst& inst, unsigned argIndex)

{

if (argIndex >= 1 && argIndex < 1 + m_numCheckArgs)

return hiddenBranch(inst).admitsStack(argIndex - 1);

return admitsStackImpl(numB3Args(inst), m_numCheckArgs + 1, inst, argIndex);

}

bool CheckSpecial::admitsExtendedOffsetAddr(Inst& inst, unsigned argIndex)

{

if (argIndex >= 1 && argIndex < 1 + m_numCheckArgs)

return false;

return admitsStack(inst, argIndex);

}

std::optional<unsigned> CheckSpecial::shouldTryAliasingDef(Inst& inst)

{

if (std::optional<unsigned> branchDef = hiddenBranch(inst).shouldTryAliasingDef())

return *branchDef + 1;

return std::nullopt;

}

CCallHelpers::Jump CheckSpecial::generate(Inst& inst, CCallHelpers& jit, GenerationContext& context)

{

using namespace Air;

CCallHelpers::Jump fail = hiddenBranch(inst).generate(jit, context);

ASSERT(fail.isSet());

StackmapValue* value = inst.origin->as<StackmapValue>();

ASSERT(value);

Vector<ValueRep> reps = repsImpl(context, numB3Args(inst), m_numCheckArgs + 1, inst);

// Set aside the args that are relevant to undoing the operation. This is because we don't want to

// capture all of inst in the closure below.

Vector<Arg, 3> args;

for (unsigned i = 0; i < m_numCheckArgs; ++i)

args.append(inst.args()[1 + i]);

context.latePaths.append(std::tuple {

inst.origin->origin(),

createSharedTask<GenerationContext::LatePathFunction>(

[=, this] (auto& jit, GenerationContext& context) {

fail.link(&jit);

// If necessary, undo the operation.

switch (m_checkKind.opcode) {

case BranchAdd32:

if ((m_numCheckArgs == 4 && args[1] == args[2] && args[2] == args[3])

|| (m_numCheckArgs == 3 && args[1] == args[2])) {

// This is ugly, but that's fine - we won't have to do this very often.

ASSERT(args[1].isGPR());

GPRReg valueGPR = args[1].gpr();

GPRReg scratchGPR = CCallHelpers::selectScratchGPR(valueGPR);

jit.pushToSave(scratchGPR);

jit.setCarry(scratchGPR);

jit.lshift32(CCallHelpers::TrustedImm32(31), scratchGPR);

jit.urshift32(CCallHelpers::TrustedImm32(1), valueGPR);

jit.or32(scratchGPR, valueGPR);

jit.popToRestore(scratchGPR);

break;

}

if (m_numCheckArgs == 4) {

if (args[1] == args[3])

Inst(Sub32, nullptr, args[2], args[3]).generate(jit, context);

else if (args[2] == args[3])

Inst(Sub32, nullptr, args[1], args[3]).generate(jit, context);

} else if (m_numCheckArgs == 3)

Inst(Sub32, nullptr, args[1], args[2]).generate(jit, context);

break;

case BranchAdd64:

if ((m_numCheckArgs == 4 && args[1] == args[2] && args[2] == args[3])

|| (m_numCheckArgs == 3 && args[1] == args[2])) {

// This is ugly, but that's fine - we won't have to do this very often.

ASSERT(args[1].isGPR());

GPRReg valueGPR = args[1].gpr();

GPRReg scratchGPR = CCallHelpers::selectScratchGPR(valueGPR);

jit.pushToSave(scratchGPR);

jit.setCarry(scratchGPR);

jit.lshift64(CCallHelpers::TrustedImm32(63), scratchGPR);

jit.urshift64(CCallHelpers::TrustedImm32(1), valueGPR);

jit.or64(scratchGPR, valueGPR);

jit.popToRestore(scratchGPR);

break;

}

if (m_numCheckArgs == 4) {

if (args[1] == args[3])

Inst(Sub64, nullptr, args[2], args[3]).generate(jit, context);

else if (args[2] == args[3])

Inst(Sub64, nullptr, args[1], args[3]).generate(jit, context);

} else if (m_numCheckArgs == 3)

Inst(Sub64, nullptr, args[1], args[2]).generate(jit, context);

break;

case BranchSub32: {

if (m_numCheckArgs == 4) {

// Use, Use, EarlyDef. Thus Def register is different from both Use.

// In this case, we do not need to recover them since Used registers are not clobbered.

} else if (m_numCheckArgs == 3) {

// In that case, just adding back will recover the original input in UseDef side.

Inst(Add32, nullptr, args[1], args[2]).generate(jit, context);

}

break;

}

case BranchSub64:

if (m_numCheckArgs == 4) {

// Use, Use, EarlyDef. Thus Def register is different from both Use.

// In this case, we do not need to recover them since Used registers are not clobbered.

} else if (m_numCheckArgs == 3) {

// In that case, just adding back will recover the original input in UseDef side.

Inst(Add64, nullptr, args[1], args[2]).generate(jit, context);

}

break;

case BranchNeg32:

Inst(Neg32, nullptr, args[1]).generate(jit, context);

break;

case BranchNeg64:

Inst(Neg64, nullptr, args[1]).generate(jit, context);

break;

default:

break;

}

value->m_generator->run(jit, StackmapGenerationParams(value, reps, context));

})

});

return CCallHelpers::Jump(); // As far as Air thinks, we are not a terminal.

}

void CheckSpecial::dumpImpl(PrintStream& out) const

{

out.print(m_checkKind, "(", m_numCheckArgs, ",", m_stackmapRole, ")");

}

void CheckSpecial::deepDumpImpl(PrintStream& out) const

{

out.print("B3::CheckValue lowered to ", m_checkKind, " with ", m_numCheckArgs, " args.");

}

} } // namespace JSC::B3

#endif // ENABLE(B3_JIT)

WebKit/Source/JavaScriptCore/b3/B3CheckSpecial.cpp at main · WebKit/WebKit · GitHub

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