| /* |
| * Copyright (C) 2015-2017 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 "B3CheckSpecial.h" |
| |
| #if ENABLE(B3_JIT) |
| |
| #include "AirGenerationContext.h" |
| #include "AirInstInlines.h" |
| #include "B3StackmapGenerationParams.h" |
| #include "B3ValueInlines.h" |
| #include "CCallHelpers.h" |
| |
| namespace JSC { namespace B3 { |
| |
| using Inst = Air::Inst; |
| using Arg = Air::Arg; |
| using GenerationContext = Air::GenerationContext; |
| |
| namespace { |
| |
| unsigned 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 numB3Args(Value* value) |
| { |
| return numB3Args(value->kind()); |
| } |
| |
| unsigned 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() |
| { |
| } |
| |
| Inst CheckSpecial::hiddenBranch(const Inst& inst) const |
| { |
| Inst hiddenBranch(m_checkKind, inst.origin); |
| hiddenBranch.args.reserveInitialCapacity(m_numCheckArgs); |
| for (unsigned i = 0; i < m_numCheckArgs; ++i) |
| hiddenBranch.args.append(inst.args[i + 1]); |
| ASSERT(hiddenBranch.isTerminal()); |
| return hiddenBranch; |
| } |
| |
| void CheckSpecial::forEachArg(Inst& inst, const ScopedLambda<Inst::EachArgCallback>& callback) |
| { |
| using namespace Air; |
| 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); |
| }); |
| |
| Optional<unsigned> firstRecoverableIndex; |
| if (m_checkKind.opcode == BranchAdd32 || m_checkKind.opcode == BranchAdd64) |
| firstRecoverableIndex = 1; |
| 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); |
| } |
| |
| Optional<unsigned> CheckSpecial::shouldTryAliasingDef(Inst& inst) |
| { |
| if (Optional<unsigned> branchDef = hiddenBranch(inst).shouldTryAliasingDef()) |
| return *branchDef + 1; |
| return WTF::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( |
| createSharedTask<GenerationContext::LatePathFunction>( |
| [=] (CCallHelpers& 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: |
| Inst(Add32, nullptr, args[1], args[2]).generate(jit, context); |
| break; |
| case BranchSub64: |
| 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) |
