Source/JavaScriptCore/llint/LowLevelInterpreter64.asm

# Copyright (C) 2011-2018 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. AND ITS CONTRIBUTORS ``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 ITS 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.


# Utilities.
macro jumpToInstruction()
    jmp [PB, PC, 8], BytecodePtrTag
end

macro dispatch(advance)
    addp advance, PC
    jumpToInstruction()
end

macro dispatchInt(advance)
    addi advance, PC
    jumpToInstruction()
end

macro dispatchIntIndirect(offset)
    dispatchInt(offset * 8[PB, PC, 8])
end

macro dispatchAfterCall()
    loadi ArgumentCount + TagOffset[cfr], PC
    loadp CodeBlock[cfr], PB
    loadp CodeBlock::m_instructions[PB], PB
    unpoison(_g_CodeBlockPoison, PB, t1)
    loadisFromInstruction(1, t1)
    storeq r0, [cfr, t1, 8]
    valueProfile(r0, (CallOpCodeSize - 1), t3)
    dispatch(CallOpCodeSize)
end

macro cCall2(function)
    checkStackPointerAlignment(t4, 0xbad0c002)
    if X86_64 or ARM64 or ARM64E
        call function
    elsif X86_64_WIN
        # Note: this implementation is only correct if the return type size is > 8 bytes.
        # See macro cCall2Void for an implementation when the return type <= 8 bytes.
        # On Win64, when the return type is larger than 8 bytes, we need to allocate space on the stack for the return value.
        # On entry rcx (a0), should contain a pointer to this stack space. The other parameters are shifted to the right,
        # rdx (a1) should contain the first argument, and r8 (a2) should contain the second argument.
        # On return, rax contains a pointer to this stack value, and we then need to copy the 16 byte return value into rax (r0) and rdx (r1)
        # since the return value is expected to be split between the two.
        # See http://msdn.microsoft.com/en-us/library/7572ztz4.aspx
        move a1, a2
        move a0, a1
        subp 48, sp
        move sp, a0
        addp 32, a0
        call function
        addp 48, sp
        move 8[r0], r1
        move [r0], r0
    elsif C_LOOP
        cloopCallSlowPath function, a0, a1
    else
        error
    end
end

macro cCall2Void(function)
    if C_LOOP
        cloopCallSlowPathVoid function, a0, a1
    elsif X86_64_WIN
        # Note: we cannot use the cCall2 macro for Win64 in this case,
        # as the Win64 cCall2 implemenation is only correct when the return type size is > 8 bytes.
        # On Win64, rcx and rdx are used for passing the first two parameters.
        # We also need to make room on the stack for all four parameter registers.
        # See http://msdn.microsoft.com/en-us/library/ms235286.aspx
        subp 32, sp 
        call function
        addp 32, sp
    else
        cCall2(function)
    end
end

# This barely works. arg3 and arg4 should probably be immediates.
macro cCall4(function)
    checkStackPointerAlignment(t4, 0xbad0c004)
    if X86_64 or ARM64 or ARM64E
        call function
    elsif X86_64_WIN
        # On Win64, rcx, rdx, r8, and r9 are used for passing the first four parameters.
        # We also need to make room on the stack for all four parameter registers.
        # See http://msdn.microsoft.com/en-us/library/ms235286.aspx
        subp 64, sp
        call function
        addp 64, sp
    else
        error
    end
end

macro doVMEntry(makeCall, callTag, callWithArityCheckTag)
    functionPrologue()
    pushCalleeSaves()

    const entry = a0
    const vm = a1
    const protoCallFrame = a2

    vmEntryRecord(cfr, sp)

    checkStackPointerAlignment(t4, 0xbad0dc01)

    storep vm, VMEntryRecord::m_vm[sp]
    loadp VM::topCallFrame[vm], t4
    storep t4, VMEntryRecord::m_prevTopCallFrame[sp]
    loadp VM::topEntryFrame[vm], t4
    storep t4, VMEntryRecord::m_prevTopEntryFrame[sp]

    loadi ProtoCallFrame::paddedArgCount[protoCallFrame], t4
    addp CallFrameHeaderSlots, t4, t4
    lshiftp 3, t4
    subp sp, t4, t3
    bqbeq sp, t3, .throwStackOverflow

    # Ensure that we have enough additional stack capacity for the incoming args,
    # and the frame for the JS code we're executing. We need to do this check
    # before we start copying the args from the protoCallFrame below.
    if C_LOOP
        bpaeq t3, VM::m_cloopStackLimit[vm], .stackHeightOK
    else
        bpaeq t3, VM::m_softStackLimit[vm], .stackHeightOK
    end

    if C_LOOP
        move entry, t4
        move vm, t5
        cloopCallSlowPath _llint_stack_check_at_vm_entry, vm, t3
        bpeq t0, 0, .stackCheckFailed
        move t4, entry
        move t5, vm
        jmp .stackHeightOK

.stackCheckFailed:
        move t4, entry
        move t5, vm
    end

.throwStackOverflow:
    move vm, a0
    move protoCallFrame, a1
    cCall2(_llint_throw_stack_overflow_error)

    vmEntryRecord(cfr, t4)

    loadp VMEntryRecord::m_vm[t4], vm
    loadp VMEntryRecord::m_prevTopCallFrame[t4], extraTempReg
    storep extraTempReg, VM::topCallFrame[vm]
    loadp VMEntryRecord::m_prevTopEntryFrame[t4], extraTempReg
    storep extraTempReg, VM::topEntryFrame[vm]

    subp cfr, CalleeRegisterSaveSize, sp

    popCalleeSaves()
    functionEpilogue()
    ret

.stackHeightOK:
    move t3, sp
    move 4, t3

.copyHeaderLoop:
    # Copy the CodeBlock/Callee/ArgumentCount/|this| from protoCallFrame into the callee frame.
    subi 1, t3
    loadq [protoCallFrame, t3, 8], extraTempReg
    storeq extraTempReg, CodeBlock[sp, t3, 8]
    btinz t3, .copyHeaderLoop

    loadi PayloadOffset + ProtoCallFrame::argCountAndCodeOriginValue[protoCallFrame], t4
    subi 1, t4
    loadi ProtoCallFrame::paddedArgCount[protoCallFrame], extraTempReg
    subi 1, extraTempReg

    bieq t4, extraTempReg, .copyArgs
    move ValueUndefined, t3
.fillExtraArgsLoop:
    subi 1, extraTempReg
    storeq t3, ThisArgumentOffset + 8[sp, extraTempReg, 8]
    bineq t4, extraTempReg, .fillExtraArgsLoop

.copyArgs:
    loadp ProtoCallFrame::args[protoCallFrame], t3

.copyArgsLoop:
    btiz t4, .copyArgsDone
    subi 1, t4
    loadq [t3, t4, 8], extraTempReg
    storeq extraTempReg, ThisArgumentOffset + 8[sp, t4, 8]
    jmp .copyArgsLoop

.copyArgsDone:
    if ARM64 or ARM64E
        move sp, t4
        storep t4, VM::topCallFrame[vm]
    else
        storep sp, VM::topCallFrame[vm]
    end
    storep cfr, VM::topEntryFrame[vm]

    checkStackPointerAlignment(extraTempReg, 0xbad0dc02)

    if POINTER_PROFILING
        btbnz ProtoCallFrame::hasArityMismatch[protoCallFrame], .doCallWithArityCheck
        move callTag, t2
        jmp .readyToCall
    .doCallWithArityCheck:
        move callWithArityCheckTag, t2
    .readyToCall:
    end

    makeCall(entry, t3, t2)

    # We may have just made a call into a JS function, so we can't rely on sp
    # for anything but the fact that our own locals (ie the VMEntryRecord) are
    # not below it. It also still has to be aligned, though.
    checkStackPointerAlignment(t2, 0xbad0dc03)

    vmEntryRecord(cfr, t4)

    loadp VMEntryRecord::m_vm[t4], vm
    loadp VMEntryRecord::m_prevTopCallFrame[t4], t2
    storep t2, VM::topCallFrame[vm]
    loadp VMEntryRecord::m_prevTopEntryFrame[t4], t2
    storep t2, VM::topEntryFrame[vm]

    subp cfr, CalleeRegisterSaveSize, sp

    popCalleeSaves()
    functionEpilogue()

    ret
end


macro makeJavaScriptCall(entry, temp, callTag)
    addp 16, sp
    if C_LOOP
        cloopCallJSFunction entry
    else
        call entry, callTag
    end
    subp 16, sp
end


macro makeHostFunctionCall(entry, temp, callTag)
    move entry, temp
    storep cfr, [sp]
    move sp, a0
    if C_LOOP
        storep lr, 8[sp]
        cloopCallNative temp
    elsif X86_64_WIN
        # We need to allocate 32 bytes on the stack for the shadow space.
        subp 32, sp
        call temp, callTag
        addp 32, sp
    else
        call temp, callTag
    end
end

_handleUncaughtException:
    loadp Callee[cfr], t3
    andp MarkedBlockMask, t3
    loadp MarkedBlockFooterOffset + MarkedBlock::Footer::m_vm[t3], t3
    restoreCalleeSavesFromVMEntryFrameCalleeSavesBuffer(t3, t0)
    loadp VM::callFrameForCatch[t3], cfr
    storep 0, VM::callFrameForCatch[t3]

    loadp CallerFrame[cfr], cfr
    vmEntryRecord(cfr, t2)

    loadp VMEntryRecord::m_vm[t2], t3
    loadp VMEntryRecord::m_prevTopCallFrame[t2], extraTempReg
    storep extraTempReg, VM::topCallFrame[t3]
    loadp VMEntryRecord::m_prevTopEntryFrame[t2], extraTempReg
    storep extraTempReg, VM::topEntryFrame[t3]

    subp cfr, CalleeRegisterSaveSize, sp

    popCalleeSaves()
    functionEpilogue()
    ret


macro prepareStateForCCall()
    leap [PB, PC, 8], PC
end

macro restoreStateAfterCCall()
    move r0, PC
    subp PB, PC
    rshiftp 3, PC
end

macro callSlowPath(slowPath)
    prepareStateForCCall()
    move cfr, a0
    move PC, a1
    cCall2(slowPath)
    restoreStateAfterCCall()
end

macro traceOperand(fromWhere, operand)
    prepareStateForCCall()
    move fromWhere, a2
    move operand, a3
    move cfr, a0
    move PC, a1
    cCall4(_llint_trace_operand)
    restoreStateAfterCCall()
end

macro traceValue(fromWhere, operand)
    prepareStateForCCall()
    move fromWhere, a2
    move operand, a3
    move cfr, a0
    move PC, a1
    cCall4(_llint_trace_value)
    restoreStateAfterCCall()
end

# Call a slow path for call call opcodes.
macro callCallSlowPath(slowPath, action)
    storei PC, ArgumentCount + TagOffset[cfr]
    prepareStateForCCall()
    move cfr, a0
    move PC, a1
    cCall2(slowPath)
    action(r0, r1)
end

macro callTrapHandler(throwHandler)
    storei PC, ArgumentCount + TagOffset[cfr]
    prepareStateForCCall()
    move cfr, a0
    move PC, a1
    cCall2(_llint_slow_path_handle_traps)
    btpnz r0, throwHandler
    loadi ArgumentCount + TagOffset[cfr], PC
end

macro checkSwitchToJITForLoop()
    checkSwitchToJIT(
        1,
        macro()
            storei PC, ArgumentCount + TagOffset[cfr]
            prepareStateForCCall()
            move cfr, a0
            move PC, a1
            cCall2(_llint_loop_osr)
            btpz r0, .recover
            move r1, sp
            jmp r0, CodeEntryPtrTag
        .recover:
            loadi ArgumentCount + TagOffset[cfr], PC
        end)
end

macro uncage(basePtr, mask, ptr, scratch)
    if GIGACAGE_ENABLED and not C_LOOP
        loadp basePtr, scratch
        btpz scratch, .done
        andp mask, ptr
        addp scratch, ptr
    .done:
    end
end

macro loadCaged(basePtr, mask, source, dest, scratch)
    loadp source, dest
    uncage(basePtr, mask, dest, scratch)
end

macro loadTypedArrayCaged(basePtr, mask, source, typeIndex, dest, scratch)
    if POISON
        leap _g_typedArrayPoisons, dest
        loadp (typeIndex - FirstTypedArrayType) * 8[dest], dest
        loadp source, scratch
        xorp scratch, dest
    else
        loadp source, dest
    end
    uncage(basePtr, mask, dest, scratch)
end

macro loadVariable(operand, value)
    loadisFromInstruction(operand, value)
    loadq [cfr, value, 8], value
end

# Index and value must be different registers. Index may be clobbered.
macro loadConstantOrVariable(index, value)
    bpgteq index, FirstConstantRegisterIndex, .constant
    loadq [cfr, index, 8], value
    jmp .done
.constant:
    loadp CodeBlock[cfr], value
    loadp CodeBlock::m_constantRegisters + VectorBufferOffset[value], value
    subp FirstConstantRegisterIndex, index
    loadq [value, index, 8], value
.done:
end

macro loadConstantOrVariableInt32(index, value, slow)
    loadConstantOrVariable(index, value)
    bqb value, tagTypeNumber, slow
end

macro loadConstantOrVariableCell(index, value, slow)
    loadConstantOrVariable(index, value)
    btqnz value, tagMask, slow
end

macro writeBarrierOnOperand(cellOperand)
    loadisFromInstruction(cellOperand, t1)
    loadConstantOrVariableCell(t1, t2, .writeBarrierDone)
    skipIfIsRememberedOrInEden(
        t2,
        macro()
            push PB, PC
            move t2, a1 # t2 can be a0 (not on 64 bits, but better safe than sorry)
            move cfr, a0
            cCall2Void(_llint_write_barrier_slow)
            pop PC, PB
        end)
.writeBarrierDone:
end

macro writeBarrierOnOperands(cellOperand, valueOperand)
    loadisFromInstruction(valueOperand, t1)
    loadConstantOrVariableCell(t1, t0, .writeBarrierDone)
    btpz t0, .writeBarrierDone

    writeBarrierOnOperand(cellOperand)
.writeBarrierDone:
end

macro writeBarrierOnGlobal(valueOperand, loadHelper)
    loadisFromInstruction(valueOperand, t1)
    loadConstantOrVariableCell(t1, t0, .writeBarrierDone)
    btpz t0, .writeBarrierDone

    loadHelper(t3)
    skipIfIsRememberedOrInEden(
        t3,
        macro()
            push PB, PC
            move cfr, a0
            move t3, a1
            cCall2Void(_llint_write_barrier_slow)
            pop PC, PB
        end
    )
.writeBarrierDone:
end

macro writeBarrierOnGlobalObject(valueOperand)
    writeBarrierOnGlobal(valueOperand,
        macro(registerToStoreGlobal)
            loadp CodeBlock[cfr], registerToStoreGlobal
            loadp CodeBlock::m_globalObject[registerToStoreGlobal], registerToStoreGlobal
        end)
end

macro writeBarrierOnGlobalLexicalEnvironment(valueOperand)
    writeBarrierOnGlobal(valueOperand,
        macro(registerToStoreGlobal)
            loadp CodeBlock[cfr], registerToStoreGlobal
            loadp CodeBlock::m_globalObject[registerToStoreGlobal], registerToStoreGlobal
            loadp JSGlobalObject::m_globalLexicalEnvironment[registerToStoreGlobal], registerToStoreGlobal
        end)
end

macro valueProfile(value, operand, scratch)
    loadpFromInstruction(operand, scratch)
    storeq value, ValueProfile::m_buckets[scratch]
end

macro structureIDToStructureWithScratch(structureIDThenStructure, scratch, scratch2)
    loadp CodeBlock[cfr], scratch
    loadp CodeBlock::m_poisonedVM[scratch], scratch
    unpoison(_g_CodeBlockPoison, scratch, scratch2)
    loadp VM::heap + Heap::m_structureIDTable + StructureIDTable::m_table[scratch], scratch
    loadp [scratch, structureIDThenStructure, 8], structureIDThenStructure
end

macro loadStructureWithScratch(cell, structure, scratch, scratch2)
    loadi JSCell::m_structureID[cell], structure
    structureIDToStructureWithScratch(structure, scratch, scratch2)
end

# Entrypoints into the interpreter.

# Expects that CodeBlock is in t1, which is what prologue() leaves behind.
macro functionArityCheck(doneLabel, slowPath)
    loadi PayloadOffset + ArgumentCount[cfr], t0
    biaeq t0, CodeBlock::m_numParameters[t1], doneLabel
    prepareStateForCCall()
    move cfr, a0
    move PC, a1
    cCall2(slowPath)   # This slowPath has the protocol: r0 = 0 => no error, r0 != 0 => error
    btiz r0, .noError
    move r1, cfr   # r1 contains caller frame
    jmp _llint_throw_from_slow_path_trampoline

.noError:
    move r1, t1 # r1 contains slotsToAdd.
    btiz t1, .continue
    loadi PayloadOffset + ArgumentCount[cfr], t2
    addi CallFrameHeaderSlots, t2

    // Check if there are some unaligned slots we can use
    move t1, t3
    andi StackAlignmentSlots - 1, t3
    btiz t3, .noExtraSlot
    move ValueUndefined, t0
.fillExtraSlots:
    storeq t0, [cfr, t2, 8]
    addi 1, t2
    bsubinz 1, t3, .fillExtraSlots
    andi ~(StackAlignmentSlots - 1), t1
    btiz t1, .continue

.noExtraSlot:
    if POINTER_PROFILING
        if ARM64 or ARM64E
            loadp 8[cfr], lr
        end

        addp 16, cfr, t3
        untagReturnAddress t3
    end

    // Move frame up t1 slots
    negq t1
    move cfr, t3
    subp CalleeSaveSpaceAsVirtualRegisters * 8, t3
    addi CalleeSaveSpaceAsVirtualRegisters, t2
    move t1, t0
    lshiftp 3, t0
    addp t0, cfr
    addp t0, sp
.copyLoop:
    loadq [t3], t0
    storeq t0, [t3, t1, 8]
    addp 8, t3
    bsubinz 1, t2, .copyLoop

    // Fill new slots with JSUndefined
    move t1, t2
    move ValueUndefined, t0
.fillLoop:
    storeq t0, [t3, t1, 8]
    addp 8, t3
    baddinz 1, t2, .fillLoop

    if POINTER_PROFILING
        addp 16, cfr, t1
        tagReturnAddress t1

        if ARM64 or ARM64E
            storep lr, 8[cfr]
        end
    end

.continue:
    # Reload CodeBlock and reset PC, since the slow_path clobbered them.
    loadp CodeBlock[cfr], t1
    loadp CodeBlock::m_instructions[t1], PB
    unpoison(_g_CodeBlockPoison, PB, t2)
    move 0, PC
    jmp doneLabel
end

macro branchIfException(label)
    loadp Callee[cfr], t3
    andp MarkedBlockMask, t3
    loadp MarkedBlockFooterOffset + MarkedBlock::Footer::m_vm[t3], t3
    btqz VM::m_exception[t3], .noException
    jmp label
.noException:
end


# Instruction implementations
_llint_op_enter:
    traceExecution()
    checkStackPointerAlignment(t2, 0xdead00e1)
    loadp CodeBlock[cfr], t2                // t2<CodeBlock> = cfr.CodeBlock
    loadi CodeBlock::m_numVars[t2], t2      // t2<size_t> = t2<CodeBlock>.m_numVars
    subq CalleeSaveSpaceAsVirtualRegisters, t2
    move cfr, t1
    subq CalleeSaveSpaceAsVirtualRegisters * 8, t1
    btiz t2, .opEnterDone
    move ValueUndefined, t0
    negi t2
    sxi2q t2, t2
.opEnterLoop:
    storeq t0, [t1, t2, 8]
    addq 1, t2
    btqnz t2, .opEnterLoop
.opEnterDone:
    callSlowPath(_slow_path_enter)
    dispatch(constexpr op_enter_length)


_llint_op_get_argument:
    traceExecution()
    loadisFromInstruction(1, t1)
    loadisFromInstruction(2, t2)
    loadi PayloadOffset + ArgumentCount[cfr], t0
    bilteq t0, t2, .opGetArgumentOutOfBounds
    loadq ThisArgumentOffset[cfr, t2, 8], t0
    storeq t0, [cfr, t1, 8]
    valueProfile(t0, 3, t2)
    dispatch(constexpr op_get_argument_length)

.opGetArgumentOutOfBounds:
    storeq ValueUndefined, [cfr, t1, 8]
    valueProfile(ValueUndefined, 3, t2)
    dispatch(constexpr op_get_argument_length)


_llint_op_argument_count:
    traceExecution()
    loadisFromInstruction(1, t1)
    loadi PayloadOffset + ArgumentCount[cfr], t0
    subi 1, t0
    orq TagTypeNumber, t0
    storeq t0, [cfr, t1, 8]
    dispatch(constexpr op_argument_count_length)


_llint_op_get_scope:
    traceExecution()
    loadp Callee[cfr], t0
    loadp JSCallee::m_scope[t0], t0
    loadisFromInstruction(1, t1)
    storeq t0, [cfr, t1, 8]
    dispatch(constexpr op_get_scope_length)


_llint_op_to_this:
    traceExecution()
    loadisFromInstruction(1, t0)
    loadq [cfr, t0, 8], t0
    btqnz t0, tagMask, .opToThisSlow
    bbneq JSCell::m_type[t0], FinalObjectType, .opToThisSlow
    loadStructureWithScratch(t0, t1, t2, t3)
    loadpFromInstruction(2, t2)
    bpneq t1, t2, .opToThisSlow
    dispatch(constexpr op_to_this_length)

.opToThisSlow:
    callSlowPath(_slow_path_to_this)
    dispatch(constexpr op_to_this_length)


_llint_op_check_tdz:
    traceExecution()
    loadisFromInstruction(1, t0)
    loadConstantOrVariable(t0, t1)
    bqneq t1, ValueEmpty, .opNotTDZ
    callSlowPath(_slow_path_throw_tdz_error)

.opNotTDZ:
    dispatch(constexpr op_check_tdz_length)


_llint_op_mov:
    traceExecution()
    loadisFromInstruction(2, t1)
    loadisFromInstruction(1, t0)
    loadConstantOrVariable(t1, t2)
    storeq t2, [cfr, t0, 8]
    dispatch(constexpr op_mov_length)


_llint_op_not:
    traceExecution()
    loadisFromInstruction(2, t0)
    loadisFromInstruction(1, t1)
    loadConstantOrVariable(t0, t2)
    xorq ValueFalse, t2
    btqnz t2, ~1, .opNotSlow
    xorq ValueTrue, t2
    storeq t2, [cfr, t1, 8]
    dispatch(constexpr op_not_length)

.opNotSlow:
    callSlowPath(_slow_path_not)
    dispatch(constexpr op_not_length)


macro equalityComparison(integerComparison, slowPath)
    loadisFromInstruction(3, t0)
    loadisFromInstruction(2, t2)
    loadisFromInstruction(1, t3)
    loadConstantOrVariableInt32(t0, t1, .slow)
    loadConstantOrVariableInt32(t2, t0, .slow)
    integerComparison(t0, t1, t0)
    orq ValueFalse, t0
    storeq t0, [cfr, t3, 8]
    dispatch(4)

.slow:
    callSlowPath(slowPath)
    dispatch(4)
end


macro equalityJump(integerComparison, slowPath)
    loadisFromInstruction(1, t2)
    loadisFromInstruction(2, t3)
    loadConstantOrVariableInt32(t2, t0, .slow)
    loadConstantOrVariableInt32(t3, t1, .slow)
    integerComparison(t0, t1, .jumpTarget)
    dispatch(constexpr op_jeq_length)

.jumpTarget:
    dispatchIntIndirect(3)

.slow:
    callSlowPath(slowPath)
    dispatch(0)
end


macro equalNullComparison()
    loadisFromInstruction(2, t0)
    loadq [cfr, t0, 8], t0
    btqnz t0, tagMask, .immediate
    btbnz JSCell::m_flags[t0], MasqueradesAsUndefined, .masqueradesAsUndefined
    move 0, t0
    jmp .done
.masqueradesAsUndefined:
    loadStructureWithScratch(t0, t2, t1, t3)
    loadp CodeBlock[cfr], t0
    loadp CodeBlock::m_globalObject[t0], t0
    cpeq Structure::m_globalObject[t2], t0, t0
    jmp .done
.immediate:
    andq ~TagBitUndefined, t0
    cqeq t0, ValueNull, t0
.done:
end

_llint_op_eq_null:
    traceExecution()
    equalNullComparison()
    loadisFromInstruction(1, t1)
    orq ValueFalse, t0
    storeq t0, [cfr, t1, 8]
    dispatch(constexpr op_eq_null_length)


_llint_op_neq_null:
    traceExecution()
    equalNullComparison()
    loadisFromInstruction(1, t1)
    xorq ValueTrue, t0
    storeq t0, [cfr, t1, 8]
    dispatch(constexpr op_neq_null_length)


macro strictEq(equalityOperation, slowPath)
    loadisFromInstruction(3, t0)
    loadisFromInstruction(2, t2)
    loadConstantOrVariable(t0, t1)
    loadConstantOrVariable(t2, t0)
    move t0, t2
    orq t1, t2
    btqz t2, tagMask, .slow
    bqaeq t0, tagTypeNumber, .leftOK
    btqnz t0, tagTypeNumber, .slow
.leftOK:
    bqaeq t1, tagTypeNumber, .rightOK
    btqnz t1, tagTypeNumber, .slow
.rightOK:
    equalityOperation(t0, t1, t0)
    loadisFromInstruction(1, t1)
    orq ValueFalse, t0
    storeq t0, [cfr, t1, 8]
    dispatch(4)

.slow:
    callSlowPath(slowPath)
    dispatch(4)
end


macro strictEqualityJump(equalityOperation, slowPath)
    loadisFromInstruction(1, t2)
    loadisFromInstruction(2, t3)
    loadConstantOrVariable(t2, t0)
    loadConstantOrVariable(t3, t1)
    move t0, t2
    orq t1, t2
    btqz t2, tagMask, .slow
    bqaeq t0, tagTypeNumber, .leftOK
    btqnz t0, tagTypeNumber, .slow
.leftOK:
    bqaeq t1, tagTypeNumber, .rightOK
    btqnz t1, tagTypeNumber, .slow
.rightOK:
    equalityOperation(t0, t1, .jumpTarget)
    dispatch(constexpr op_jstricteq_length)

.jumpTarget:
    dispatchIntIndirect(3)

.slow:
    callSlowPath(slowPath)
    dispatch(0)
end


_llint_op_stricteq:
    traceExecution()
    strictEq(
        macro (left, right, result) cqeq left, right, result end,
        _slow_path_stricteq)


_llint_op_nstricteq:
    traceExecution()
    strictEq(
        macro (left, right, result) cqneq left, right, result end,
        _slow_path_nstricteq)


_llint_op_jstricteq:
    traceExecution()
    strictEqualityJump(
        macro (left, right, target) bqeq left, right, target end,
        _llint_slow_path_jstricteq)


_llint_op_jnstricteq:
    traceExecution()
    strictEqualityJump(
        macro (left, right, target) bqneq left, right, target end,
        _llint_slow_path_jnstricteq)


macro preOp(arithmeticOperation, slowPath)
    traceExecution()
    loadisFromInstruction(1, t0)
    loadq [cfr, t0, 8], t1
    bqb t1, tagTypeNumber, .slow
    arithmeticOperation(t1, .slow)
    orq tagTypeNumber, t1
    storeq t1, [cfr, t0, 8]
    dispatch(2)

.slow:
    callSlowPath(slowPath)
    dispatch(2)
end

_llint_op_inc:
    preOp(
        macro (value, slow) baddio 1, value, slow end,
        _slow_path_inc)


_llint_op_dec:
    preOp(
        macro (value, slow) bsubio 1, value, slow end,
        _slow_path_dec)


_llint_op_to_number:
    traceExecution()
    loadisFromInstruction(2, t0)
    loadisFromInstruction(1, t1)
    loadConstantOrVariable(t0, t2)
    bqaeq t2, tagTypeNumber, .opToNumberIsImmediate
    btqz t2, tagTypeNumber, .opToNumberSlow
.opToNumberIsImmediate:
    storeq t2, [cfr, t1, 8]
    valueProfile(t2, 3, t0)
    dispatch(constexpr op_to_number_length)

.opToNumberSlow:
    callSlowPath(_slow_path_to_number)
    dispatch(constexpr op_to_number_length)


_llint_op_to_string:
    traceExecution()
    loadisFromInstruction(2, t1)
    loadisFromInstruction(1, t2)
    loadConstantOrVariable(t1, t0)
    btqnz t0, tagMask, .opToStringSlow
    bbneq JSCell::m_type[t0], StringType, .opToStringSlow
.opToStringIsString:
    storeq t0, [cfr, t2, 8]
    dispatch(constexpr op_to_string_length)

.opToStringSlow:
    callSlowPath(_slow_path_to_string)
    dispatch(constexpr op_to_string_length)


_llint_op_to_object:
    traceExecution()
    loadisFromInstruction(2, t0)
    loadisFromInstruction(1, t1)
    loadConstantOrVariable(t0, t2)
    btqnz t2, tagMask, .opToObjectSlow
    bbb JSCell::m_type[t2], ObjectType, .opToObjectSlow
    storeq t2, [cfr, t1, 8]
    valueProfile(t2, 4, t0)
    dispatch(constexpr op_to_object_length)

.opToObjectSlow:
    callSlowPath(_slow_path_to_object)
    dispatch(constexpr op_to_object_length)


_llint_op_negate:
    traceExecution()
    loadisFromInstruction(2, t0)
    loadisFromInstruction(1, t1)
    loadConstantOrVariable(t0, t3)
    loadisFromInstruction(3, t2)
    bqb t3, tagTypeNumber, .opNegateNotInt
    btiz t3, 0x7fffffff, .opNegateSlow
    negi t3
    ori ArithProfileInt, t2
    orq tagTypeNumber, t3
    storeisToInstruction(t2, 3)
    storeq t3, [cfr, t1, 8]
    dispatch(constexpr op_negate_length)
.opNegateNotInt:
    btqz t3, tagTypeNumber, .opNegateSlow
    xorq 0x8000000000000000, t3
    ori ArithProfileNumber, t2
    storeq t3, [cfr, t1, 8]
    storeisToInstruction(t2, 3)
    dispatch(constexpr op_negate_length)

.opNegateSlow:
    callSlowPath(_slow_path_negate)
    dispatch(constexpr op_negate_length)


macro binaryOpCustomStore(integerOperationAndStore, doubleOperation, slowPath)
    loadisFromInstruction(3, t0)
    loadisFromInstruction(2, t2)
    loadConstantOrVariable(t0, t1)
    loadConstantOrVariable(t2, t0)
    bqb t0, tagTypeNumber, .op1NotInt
    bqb t1, tagTypeNumber, .op2NotInt
    loadisFromInstruction(1, t2)
    integerOperationAndStore(t1, t0, .slow, t2)
    loadisFromInstruction(4, t1)
    ori ArithProfileIntInt, t1
    storeisToInstruction(t1, 4)
    dispatch(5)

.op1NotInt:
    # First operand is definitely not an int, the second operand could be anything.
    btqz t0, tagTypeNumber, .slow
    bqaeq t1, tagTypeNumber, .op1NotIntOp2Int
    btqz t1, tagTypeNumber, .slow
    addq tagTypeNumber, t1
    fq2d t1, ft1
    loadisFromInstruction(4, t2)
    ori ArithProfileNumberNumber, t2
    storeisToInstruction(t2, 4)
    jmp .op1NotIntReady
.op1NotIntOp2Int:
    loadisFromInstruction(4, t2)
    ori ArithProfileNumberInt, t2
    storeisToInstruction(t2, 4)
    ci2d t1, ft1
.op1NotIntReady:
    loadisFromInstruction(1, t2)
    addq tagTypeNumber, t0
    fq2d t0, ft0
    doubleOperation(ft1, ft0)
    fd2q ft0, t0
    subq tagTypeNumber, t0
    storeq t0, [cfr, t2, 8]
    dispatch(5)

.op2NotInt:
    # First operand is definitely an int, the second is definitely not.
    loadisFromInstruction(1, t2)
    btqz t1, tagTypeNumber, .slow
    loadisFromInstruction(4, t3)
    ori ArithProfileIntNumber, t3
    storeisToInstruction(t3, 4)
    ci2d t0, ft0
    addq tagTypeNumber, t1
    fq2d t1, ft1
    doubleOperation(ft1, ft0)
    fd2q ft0, t0
    subq tagTypeNumber, t0
    storeq t0, [cfr, t2, 8]
    dispatch(5)

.slow:
    callSlowPath(slowPath)
    dispatch(5)
end

macro binaryOp(integerOperation, doubleOperation, slowPath)
    binaryOpCustomStore(
        macro (left, right, slow, index)
            integerOperation(left, right, slow)
            orq tagTypeNumber, right
            storeq right, [cfr, index, 8]
        end,
        doubleOperation, slowPath)
end

_llint_op_add:
    traceExecution()
    binaryOp(
        macro (left, right, slow) baddio left, right, slow end,
        macro (left, right) addd left, right end,
        _slow_path_add)


_llint_op_mul:
    traceExecution()
    binaryOpCustomStore(
        macro (left, right, slow, index)
            # Assume t3 is scratchable.
            move right, t3
            bmulio left, t3, slow
            btinz t3, .done
            bilt left, 0, slow
            bilt right, 0, slow
        .done:
            orq tagTypeNumber, t3
            storeq t3, [cfr, index, 8]
        end,
        macro (left, right) muld left, right end,
        _slow_path_mul)


_llint_op_sub:
    traceExecution()
    binaryOp(
        macro (left, right, slow) bsubio left, right, slow end,
        macro (left, right) subd left, right end,
        _slow_path_sub)


_llint_op_div:
    traceExecution()
    if X86_64 or X86_64_WIN
        binaryOpCustomStore(
            macro (left, right, slow, index)
                # Assume t3 is scratchable.
                btiz left, slow
                bineq left, -1, .notNeg2TwoThe31DivByNeg1
                bieq right, -2147483648, .slow
            .notNeg2TwoThe31DivByNeg1:
                btinz right, .intOK
                bilt left, 0, slow
            .intOK:
                move left, t3
                move right, t0
                cdqi
                idivi t3
                btinz t1, slow
                orq tagTypeNumber, t0
                storeq t0, [cfr, index, 8]
            end,
            macro (left, right) divd left, right end,
            _slow_path_div)
    else
        callSlowPath(_slow_path_div)
        dispatch(constexpr op_div_length)
    end


macro bitOp(operation, slowPath, advance)
    loadisFromInstruction(3, t0)
    loadisFromInstruction(2, t2)
    loadisFromInstruction(1, t3)
    loadConstantOrVariable(t0, t1)
    loadConstantOrVariable(t2, t0)
    bqb t0, tagTypeNumber, .slow
    bqb t1, tagTypeNumber, .slow
    operation(t1, t0)
    orq tagTypeNumber, t0
    storeq t0, [cfr, t3, 8]
    dispatch(advance)

.slow:
    callSlowPath(slowPath)
    dispatch(advance)
end

_llint_op_lshift:
    traceExecution()
    bitOp(
        macro (left, right) lshifti left, right end,
        _slow_path_lshift,
        constexpr op_lshift_length)


_llint_op_rshift:
    traceExecution()
    bitOp(
        macro (left, right) rshifti left, right end,
        _slow_path_rshift,
        constexpr op_rshift_length)


_llint_op_urshift:
    traceExecution()
    bitOp(
        macro (left, right) urshifti left, right end,
        _slow_path_urshift,
        constexpr op_urshift_length)


_llint_op_unsigned:
    traceExecution()
    loadisFromInstruction(1, t0)
    loadisFromInstruction(2, t1)
    loadConstantOrVariable(t1, t2)
    bilt t2, 0, .opUnsignedSlow
    storeq t2, [cfr, t0, 8]
    dispatch(constexpr op_unsigned_length)
.opUnsignedSlow:
    callSlowPath(_slow_path_unsigned)
    dispatch(constexpr op_unsigned_length)


_llint_op_bitand:
    traceExecution()
    bitOp(
        macro (left, right) andi left, right end,
        _slow_path_bitand,
        constexpr op_bitand_length)


_llint_op_bitxor:
    traceExecution()
    bitOp(
        macro (left, right) xori left, right end,
        _slow_path_bitxor,
        constexpr op_bitxor_length)


_llint_op_bitor:
    traceExecution()
    bitOp(
        macro (left, right) ori left, right end,
        _slow_path_bitor,
        constexpr op_bitor_length)


_llint_op_overrides_has_instance:
    traceExecution()
    loadisFromStruct(OpOverridesHasInstance::m_dst, t3)

    loadisFromStruct(OpOverridesHasInstance::m_hasInstanceValue, t1)
    loadConstantOrVariable(t1, t0)
    loadp CodeBlock[cfr], t2
    loadp CodeBlock::m_globalObject[t2], t2
    loadp JSGlobalObject::m_functionProtoHasInstanceSymbolFunction[t2], t2
    bqneq t0, t2, .opOverridesHasInstanceNotDefaultSymbol

    loadisFromStruct(OpOverridesHasInstance::m_constructor, t1)
    loadConstantOrVariable(t1, t0)
    tbz JSCell::m_flags[t0], ImplementsDefaultHasInstance, t1
    orq ValueFalse, t1
    storeq t1, [cfr, t3, 8]
    dispatch(constexpr op_overrides_has_instance_length)

.opOverridesHasInstanceNotDefaultSymbol:
    storeq ValueTrue, [cfr, t3, 8]
    dispatch(constexpr op_overrides_has_instance_length)


_llint_op_instanceof_custom:
    traceExecution()
    callSlowPath(_llint_slow_path_instanceof_custom)
    dispatch(constexpr op_instanceof_custom_length)


_llint_op_is_empty:
    traceExecution()
    loadisFromInstruction(2, t1)
    loadisFromInstruction(1, t2)
    loadConstantOrVariable(t1, t0)
    cqeq t0, ValueEmpty, t3
    orq ValueFalse, t3
    storeq t3, [cfr, t2, 8]
    dispatch(constexpr op_is_empty_length)


_llint_op_is_undefined:
    traceExecution()
    loadisFromInstruction(2, t1)
    loadisFromInstruction(1, t2)
    loadConstantOrVariable(t1, t0)
    btqz t0, tagMask, .opIsUndefinedCell
    cqeq t0, ValueUndefined, t3
    orq ValueFalse, t3
    storeq t3, [cfr, t2, 8]
    dispatch(constexpr op_is_undefined_length)
.opIsUndefinedCell:
    btbnz JSCell::m_flags[t0], MasqueradesAsUndefined, .masqueradesAsUndefined
    move ValueFalse, t1
    storeq t1, [cfr, t2, 8]
    dispatch(constexpr op_is_undefined_length)
.masqueradesAsUndefined:
    loadStructureWithScratch(t0, t3, t1, t5)
    loadp CodeBlock[cfr], t1
    loadp CodeBlock::m_globalObject[t1], t1
    cpeq Structure::m_globalObject[t3], t1, t0
    orq ValueFalse, t0
    storeq t0, [cfr, t2, 8]
    dispatch(constexpr op_is_undefined_length)


_llint_op_is_boolean:
    traceExecution()
    loadisFromInstruction(2, t1)
    loadisFromInstruction(1, t2)
    loadConstantOrVariable(t1, t0)
    xorq ValueFalse, t0
    tqz t0, ~1, t0
    orq ValueFalse, t0
    storeq t0, [cfr, t2, 8]
    dispatch(constexpr op_is_boolean_length)


_llint_op_is_number:
    traceExecution()
    loadisFromInstruction(2, t1)
    loadisFromInstruction(1, t2)
    loadConstantOrVariable(t1, t0)
    tqnz t0, tagTypeNumber, t1
    orq ValueFalse, t1
    storeq t1, [cfr, t2, 8]
    dispatch(constexpr op_is_number_length)


_llint_op_is_cell_with_type:
    traceExecution()
    loadisFromInstruction(3, t0)
    loadisFromInstruction(2, t1)
    loadisFromInstruction(1, t2)
    loadConstantOrVariable(t1, t3)
    btqnz t3, tagMask, .notCellCase
    cbeq JSCell::m_type[t3], t0, t1
    orq ValueFalse, t1
    storeq t1, [cfr, t2, 8]
    dispatch(constexpr op_is_cell_with_type_length)
.notCellCase:
    storeq ValueFalse, [cfr, t2, 8]
    dispatch(constexpr op_is_cell_with_type_length)


_llint_op_is_object:
    traceExecution()
    loadisFromInstruction(2, t1)
    loadisFromInstruction(1, t2)
    loadConstantOrVariable(t1, t0)
    btqnz t0, tagMask, .opIsObjectNotCell
    cbaeq JSCell::m_type[t0], ObjectType, t1
    orq ValueFalse, t1
    storeq t1, [cfr, t2, 8]
    dispatch(constexpr op_is_object_length)
.opIsObjectNotCell:
    storeq ValueFalse, [cfr, t2, 8]
    dispatch(constexpr op_is_object_length)


macro loadPropertyAtVariableOffset(propertyOffsetAsInt, objectAndStorage, value)
    bilt propertyOffsetAsInt, firstOutOfLineOffset, .isInline
    loadp JSObject::m_butterfly[objectAndStorage], objectAndStorage
    negi propertyOffsetAsInt
    sxi2q propertyOffsetAsInt, propertyOffsetAsInt
    jmp .ready
.isInline:
    addp sizeof JSObject - (firstOutOfLineOffset - 2) * 8, objectAndStorage
.ready:
    loadq (firstOutOfLineOffset - 2) * 8[objectAndStorage, propertyOffsetAsInt, 8], value
end


macro storePropertyAtVariableOffset(propertyOffsetAsInt, objectAndStorage, value)
    bilt propertyOffsetAsInt, firstOutOfLineOffset, .isInline
    loadp JSObject::m_butterfly[objectAndStorage], objectAndStorage
    negi propertyOffsetAsInt
    sxi2q propertyOffsetAsInt, propertyOffsetAsInt
    jmp .ready
.isInline:
    addp sizeof JSObject - (firstOutOfLineOffset - 2) * 8, objectAndStorage
.ready:
    storeq value, (firstOutOfLineOffset - 2) * 8[objectAndStorage, propertyOffsetAsInt, 8]
end

_llint_op_get_by_id:
    traceExecution()
    loadisFromInstruction(2, t0)
    loadConstantOrVariableCell(t0, t3, .opGetByIdSlow)
    loadi JSCell::m_structureID[t3], t1
    loadisFromInstruction(4, t2)
    bineq t2, t1, .opGetByIdSlow
    loadisFromInstruction(5, t1)
    loadisFromInstruction(1, t2)
    loadPropertyAtVariableOffset(t1, t3, t0)
    storeq t0, [cfr, t2, 8]
    valueProfile(t0, 8, t1)
    dispatch(constexpr op_get_by_id_length)

.opGetByIdSlow:
    callSlowPath(_llint_slow_path_get_by_id)
    dispatch(constexpr op_get_by_id_length)


_llint_op_get_by_id_proto_load:
    traceExecution()
    loadisFromInstruction(2, t0)
    loadConstantOrVariableCell(t0, t3, .opGetByIdProtoSlow)
    loadi JSCell::m_structureID[t3], t1
    loadisFromInstruction(4, t2)
    bineq t2, t1, .opGetByIdProtoSlow
    loadisFromInstruction(5, t1)
    loadpFromInstruction(6, t3)
    loadisFromInstruction(1, t2)
    loadPropertyAtVariableOffset(t1, t3, t0)
    storeq t0, [cfr, t2, 8]
    valueProfile(t0, 8, t1)
    dispatch(constexpr op_get_by_id_proto_load_length)

.opGetByIdProtoSlow:
    callSlowPath(_llint_slow_path_get_by_id)
    dispatch(constexpr op_get_by_id_proto_load_length)


_llint_op_get_by_id_unset:
    traceExecution()
    loadisFromInstruction(2, t0)
    loadConstantOrVariableCell(t0, t3, .opGetByIdUnsetSlow)
    loadi JSCell::m_structureID[t3], t1
    loadisFromInstruction(4, t2)
    bineq t2, t1, .opGetByIdUnsetSlow
    loadisFromInstruction(1, t2)
    storeq ValueUndefined, [cfr, t2, 8]
    valueProfile(ValueUndefined, 8, t1)
    dispatch(constexpr op_get_by_id_unset_length)

.opGetByIdUnsetSlow:
    callSlowPath(_llint_slow_path_get_by_id)
    dispatch(constexpr op_get_by_id_unset_length)


_llint_op_get_array_length:
    traceExecution()
    loadisFromInstruction(2, t0)
    loadpFromInstruction(4, t1)
    loadConstantOrVariableCell(t0, t3, .opGetArrayLengthSlow)
    move t3, t2
    arrayProfile(t2, t1, t0)
    btiz t2, IsArray, .opGetArrayLengthSlow
    btiz t2, IndexingShapeMask, .opGetArrayLengthSlow
    loadisFromInstruction(1, t1)
    loadCaged(_g_gigacageBasePtrs + Gigacage::BasePtrs::jsValue, constexpr JSVALUE_GIGACAGE_MASK, JSObject::m_butterfly[t3], t0, t2)
    loadi -sizeof IndexingHeader + IndexingHeader::u.lengths.publicLength[t0], t0
    bilt t0, 0, .opGetArrayLengthSlow
    orq tagTypeNumber, t0
    valueProfile(t0, 8, t2)
    storeq t0, [cfr, t1, 8]
    dispatch(constexpr op_get_array_length_length)

.opGetArrayLengthSlow:
    callSlowPath(_llint_slow_path_get_by_id)
    dispatch(constexpr op_get_array_length_length)


_llint_op_put_by_id:
    traceExecution()
    loadisFromInstruction(1, t3)
    loadConstantOrVariableCell(t3, t0, .opPutByIdSlow)
    loadisFromInstruction(4, t2)
    bineq t2, JSCell::m_structureID[t0], .opPutByIdSlow

    # At this point, we have:
    # t2 -> current structure ID
    # t0 -> object base

    loadisFromInstruction(3, t1)
    loadConstantOrVariable(t1, t3)

    loadpFromInstruction(8, t1)

    # At this point, we have:
    # t0 -> object base
    # t1 -> put by id flags
    # t2 -> current structure ID
    # t3 -> value to put

    btpnz t1, PutByIdPrimaryTypeMask, .opPutByIdTypeCheckObjectWithStructureOrOther

    # We have one of the non-structure type checks. Find out which one.
    andp PutByIdSecondaryTypeMask, t1
    bplt t1, PutByIdSecondaryTypeString, .opPutByIdTypeCheckLessThanString

    # We are one of the following: String, Symbol, Object, ObjectOrOther, Top
    bplt t1, PutByIdSecondaryTypeObjectOrOther, .opPutByIdTypeCheckLessThanObjectOrOther

    # We are either ObjectOrOther or Top.
    bpeq t1, PutByIdSecondaryTypeTop, .opPutByIdDoneCheckingTypes

    # Check if we are ObjectOrOther.
    btqz t3, tagMask, .opPutByIdTypeCheckObject
.opPutByIdTypeCheckOther:
    andq ~TagBitUndefined, t3
    bqeq t3, ValueNull, .opPutByIdDoneCheckingTypes
    jmp .opPutByIdSlow

.opPutByIdTypeCheckLessThanObjectOrOther:
    # We are either String, Symbol or Object.
    btqnz t3, tagMask, .opPutByIdSlow
    bpeq t1, PutByIdSecondaryTypeObject, .opPutByIdTypeCheckObject
    bpeq t1, PutByIdSecondaryTypeSymbol, .opPutByIdTypeCheckSymbol
    bbeq JSCell::m_type[t3], StringType, .opPutByIdDoneCheckingTypes
    jmp .opPutByIdSlow
.opPutByIdTypeCheckObject:
    bbaeq JSCell::m_type[t3], ObjectType, .opPutByIdDoneCheckingTypes
    jmp .opPutByIdSlow
.opPutByIdTypeCheckSymbol:
    bbeq JSCell::m_type[t3], SymbolType, .opPutByIdDoneCheckingTypes
    jmp .opPutByIdSlow

.opPutByIdTypeCheckLessThanString:
    # We are one of the following: Bottom, Boolean, Other, Int32, Number
    bplt t1, PutByIdSecondaryTypeInt32, .opPutByIdTypeCheckLessThanInt32

    # We are either Int32 or Number.
    bpeq t1, PutByIdSecondaryTypeNumber, .opPutByIdTypeCheckNumber

    bqaeq t3, tagTypeNumber, .opPutByIdDoneCheckingTypes
    jmp .opPutByIdSlow

.opPutByIdTypeCheckNumber:
    btqnz t3, tagTypeNumber, .opPutByIdDoneCheckingTypes
    jmp .opPutByIdSlow

.opPutByIdTypeCheckLessThanInt32:
    # We are one of the following: Bottom, Boolean, Other.
    bpneq t1, PutByIdSecondaryTypeBoolean, .opPutByIdTypeCheckBottomOrOther
    xorq ValueFalse, t3
    btqz t3, ~1, .opPutByIdDoneCheckingTypes
    jmp .opPutByIdSlow

.opPutByIdTypeCheckBottomOrOther:
    bpeq t1, PutByIdSecondaryTypeOther, .opPutByIdTypeCheckOther
    jmp .opPutByIdSlow

.opPutByIdTypeCheckObjectWithStructureOrOther:
    btqz t3, tagMask, .opPutByIdTypeCheckObjectWithStructure
    btpnz t1, PutByIdPrimaryTypeObjectWithStructureOrOther, .opPutByIdTypeCheckOther
    jmp .opPutByIdSlow

.opPutByIdTypeCheckObjectWithStructure:
    urshiftp 3, t1
    bineq t1, JSCell::m_structureID[t3], .opPutByIdSlow

.opPutByIdDoneCheckingTypes:
    loadisFromInstruction(6, t1)
    
    btiz t1, .opPutByIdNotTransition

    # This is the transition case. t1 holds the new structureID. t2 holds the old structure ID.
    # If we have a chain, we need to check it. t0 is the base. We may clobber t1 to use it as
    # scratch.
    loadpFromInstruction(7, t3)
    btpz t3, .opPutByIdTransitionDirect

    loadp StructureChain::m_vector[t3], t3
    assert(macro (ok) btpnz t3, ok end)

    structureIDToStructureWithScratch(t2, t1, t5)
    loadq Structure::m_prototype[t2], t2
    bqeq t2, ValueNull, .opPutByIdTransitionChainDone
.opPutByIdTransitionChainLoop:
    # At this point, t2 contains a prototye, and [t3] contains the Structure* that we want that
    # prototype to have. We don't want to have to load the Structure* for t2. Instead, we load
    # the Structure* from [t3], and then we compare its id to the id in the header of t2.
    loadp [t3], t1
    loadi JSCell::m_structureID[t2], t2
    # Now, t1 has the Structure* and t2 has the StructureID that we want that Structure* to have.
    bineq t2, Structure::m_blob + StructureIDBlob::u.fields.structureID[t1], .opPutByIdSlow
    addp 8, t3
    loadq Structure::m_prototype[t1], t2
    bqneq t2, ValueNull, .opPutByIdTransitionChainLoop

.opPutByIdTransitionChainDone:
    # Reload the new structure, since we clobbered it above.
    loadisFromInstruction(6, t1)

.opPutByIdTransitionDirect:
    storei t1, JSCell::m_structureID[t0]
    writeBarrierOnOperand(1)
    # Reload base into t0
    loadisFromInstruction(1, t1)
    loadConstantOrVariable(t1, t0)

.opPutByIdNotTransition:
    # The only thing live right now is t0, which holds the base.
    loadisFromInstruction(3, t1)
    loadConstantOrVariable(t1, t2)
    loadisFromInstruction(5, t1)
    storePropertyAtVariableOffset(t1, t0, t2)
    writeBarrierOnOperands(1, 3)
    dispatch(constexpr op_put_by_id_length)

.opPutByIdSlow:
    callSlowPath(_llint_slow_path_put_by_id)
    dispatch(constexpr op_put_by_id_length)

macro finishGetByVal(result, scratch)
    loadisFromInstruction(1, scratch)
    storeq result, [cfr, scratch, 8]
    valueProfile(result, 5, scratch)
    dispatch(6)
end

macro finishIntGetByVal(result, scratch)
    orq tagTypeNumber, result
    finishGetByVal(result, scratch)
end

macro finishDoubleGetByVal(result, scratch1, scratch2)
    fd2q result, scratch1
    subq tagTypeNumber, scratch1
    finishGetByVal(scratch1, scratch2)
end

_llint_op_get_by_val:
    traceExecution()
    loadisFromInstruction(2, t2)
    loadConstantOrVariableCell(t2, t0, .opGetByValSlow)
    loadpFromInstruction(4, t3)
    move t0, t2
    arrayProfile(t2, t3, t1)
    loadisFromInstruction(3, t3)
    loadConstantOrVariableInt32(t3, t1, .opGetByValSlow)
    sxi2q t1, t1
    loadCaged(_g_gigacageBasePtrs + Gigacage::BasePtrs::jsValue, constexpr JSVALUE_GIGACAGE_MASK, JSObject::m_butterfly[t0], t3, t5)
    andi IndexingShapeMask, t2
    bieq t2, Int32Shape, .opGetByValIsContiguous
    bineq t2, ContiguousShape, .opGetByValNotContiguous

.opGetByValIsContiguous:
    biaeq t1, -sizeof IndexingHeader + IndexingHeader::u.lengths.publicLength[t3], .opGetByValSlow
    andi JSObject::m_butterflyIndexingMask[t0], t1
    loadisFromInstruction(1, t0)
    loadq [t3, t1, 8], t2
    btqz t2, .opGetByValSlow
    jmp .opGetByValDone

.opGetByValNotContiguous:
    bineq t2, DoubleShape, .opGetByValNotDouble
    biaeq t1, -sizeof IndexingHeader + IndexingHeader::u.lengths.publicLength[t3], .opGetByValSlow
    andi JSObject::m_butterflyIndexingMask[t0], t1
    loadisFromInstruction(1 ,t0)
    loadd [t3, t1, 8], ft0
    bdnequn ft0, ft0, .opGetByValSlow
    fd2q ft0, t2
    subq tagTypeNumber, t2
    jmp .opGetByValDone
    
.opGetByValNotDouble:
    subi ArrayStorageShape, t2
    bia t2, SlowPutArrayStorageShape - ArrayStorageShape, .opGetByValNotIndexedStorage
    biaeq t1, -sizeof IndexingHeader + IndexingHeader::u.lengths.vectorLength[t3], .opGetByValSlow
    andi JSObject::m_butterflyIndexingMask[t0], t1
    loadisFromInstruction(1, t0)
    loadq ArrayStorage::m_vector[t3, t1, 8], t2
    btqz t2, .opGetByValSlow

.opGetByValDone:
    storeq t2, [cfr, t0, 8]
    valueProfile(t2, 5, t0)
    dispatch(constexpr op_get_by_val_length)

.opGetByValNotIndexedStorage:
    # First lets check if we even have a typed array. This lets us do some boilerplate up front.
    loadb JSCell::m_type[t0], t2
    subi FirstTypedArrayType, t2
    biaeq t2, NumberOfTypedArrayTypesExcludingDataView, .opGetByValSlow
    
    # Sweet, now we know that we have a typed array. Do some basic things now.
    biaeq t1, JSArrayBufferView::m_length[t0], .opGetByValSlow

    # Now bisect through the various types:
    #    Int8ArrayType,
    #    Uint8ArrayType,
    #    Uint8ClampedArrayType,
    #    Int16ArrayType,
    #    Uint16ArrayType,
    #    Int32ArrayType,
    #    Uint32ArrayType,
    #    Float32ArrayType,
    #    Float64ArrayType,

    bia t2, Uint16ArrayType - FirstTypedArrayType, .opGetByValAboveUint16Array

    # We have one of Int8ArrayType .. Uint16ArrayType.
    bia t2, Uint8ClampedArrayType - FirstTypedArrayType, .opGetByValInt16ArrayOrUint16Array

    # We have one of Int8ArrayType ... Uint8ClampedArrayType
    bia t2, Int8ArrayType - FirstTypedArrayType, .opGetByValUint8ArrayOrUint8ClampedArray

    # We have Int8ArrayType.
    loadTypedArrayCaged(_g_gigacageBasePtrs + Gigacage::BasePtrs::primitive, constexpr PRIMITIVE_GIGACAGE_MASK, JSArrayBufferView::m_poisonedVector[t0], Int8ArrayType, t3, t2)
    loadbs [t3, t1], t0
    finishIntGetByVal(t0, t1)

.opGetByValUint8ArrayOrUint8ClampedArray:
    bia t2, Uint8ArrayType - FirstTypedArrayType, .opGetByValUint8ClampedArray

    # We have Uint8ArrayType.
    loadTypedArrayCaged(_g_gigacageBasePtrs + Gigacage::BasePtrs::primitive, constexpr PRIMITIVE_GIGACAGE_MASK, JSArrayBufferView::m_poisonedVector[t0], Uint8ArrayType, t3, t2)
    loadb [t3, t1], t0
    finishIntGetByVal(t0, t1)

.opGetByValUint8ClampedArray:
    # We have Uint8ClampedArrayType.
    loadTypedArrayCaged(_g_gigacageBasePtrs + Gigacage::BasePtrs::primitive, constexpr PRIMITIVE_GIGACAGE_MASK, JSArrayBufferView::m_poisonedVector[t0], Uint8ClampedArrayType, t3, t2)
    loadb [t3, t1], t0
    finishIntGetByVal(t0, t1)

.opGetByValInt16ArrayOrUint16Array:
    # We have either Int16ArrayType or Uint16ClampedArrayType.
    bia t2, Int16ArrayType - FirstTypedArrayType, .opGetByValUint16Array

    # We have Int16ArrayType.
    loadTypedArrayCaged(_g_gigacageBasePtrs + Gigacage::BasePtrs::primitive, constexpr PRIMITIVE_GIGACAGE_MASK, JSArrayBufferView::m_poisonedVector[t0], Int16ArrayType, t3, t2)
    loadhs [t3, t1, 2], t0
    finishIntGetByVal(t0, t1)

.opGetByValUint16Array:
    # We have Uint16ArrayType.
    loadTypedArrayCaged(_g_gigacageBasePtrs + Gigacage::BasePtrs::primitive, constexpr PRIMITIVE_GIGACAGE_MASK, JSArrayBufferView::m_poisonedVector[t0], Uint16ArrayType, t3, t2)
    loadh [t3, t1, 2], t0
    finishIntGetByVal(t0, t1)

.opGetByValAboveUint16Array:
    # We have one of Int32ArrayType .. Float64ArrayType.
    bia t2, Uint32ArrayType - FirstTypedArrayType, .opGetByValFloat32ArrayOrFloat64Array

    # We have either Int32ArrayType or Uint32ArrayType
    bia t2, Int32ArrayType - FirstTypedArrayType, .opGetByValUint32Array

    # We have Int32ArrayType.
    loadTypedArrayCaged(_g_gigacageBasePtrs + Gigacage::BasePtrs::primitive, constexpr PRIMITIVE_GIGACAGE_MASK, JSArrayBufferView::m_poisonedVector[t0], Int32ArrayType, t3, t2)
    loadi [t3, t1, 4], t0
    finishIntGetByVal(t0, t1)

.opGetByValUint32Array:
    # We have Uint32ArrayType.
    loadTypedArrayCaged(_g_gigacageBasePtrs + Gigacage::BasePtrs::primitive, constexpr PRIMITIVE_GIGACAGE_MASK, JSArrayBufferView::m_poisonedVector[t0], Uint32ArrayType, t3, t2)
    # This is the hardest part because of large unsigned values.
    loadi [t3, t1, 4], t0
    bilt t0, 0, .opGetByValSlow # This case is still awkward to implement in LLInt.
    finishIntGetByVal(t0, t1)

.opGetByValFloat32ArrayOrFloat64Array:
    # We have one of Float32ArrayType or Float64ArrayType. Sadly, we cannot handle Float32Array
    # inline yet. That would require some offlineasm changes.
    bieq t2, Float32ArrayType - FirstTypedArrayType, .opGetByValSlow

    # We have Float64ArrayType.
    loadTypedArrayCaged(_g_gigacageBasePtrs + Gigacage::BasePtrs::primitive, constexpr PRIMITIVE_GIGACAGE_MASK, JSArrayBufferView::m_poisonedVector[t0], Float64ArrayType, t3, t2)
    loadd [t3, t1, 8], ft0
    bdnequn ft0, ft0, .opGetByValSlow
    finishDoubleGetByVal(ft0, t0, t1)

.opGetByValSlow:
    callSlowPath(_llint_slow_path_get_by_val)
    dispatch(constexpr op_get_by_val_length)


macro contiguousPutByVal(storeCallback)
    biaeq t3, -sizeof IndexingHeader + IndexingHeader::u.lengths.publicLength[t0], .outOfBounds
.storeResult:
    loadisFromInstruction(3, t2)
    storeCallback(t2, t1, [t0, t3, 8])
    dispatch(5)

.outOfBounds:
    biaeq t3, -sizeof IndexingHeader + IndexingHeader::u.lengths.vectorLength[t0], .opPutByValOutOfBounds
    loadp 32[PB, PC, 8], t2
    storeb 1, ArrayProfile::m_mayStoreToHole[t2]
    addi 1, t3, t2
    storei t2, -sizeof IndexingHeader + IndexingHeader::u.lengths.publicLength[t0]
    jmp .storeResult
end

macro putByVal(slowPath)
    traceExecution()
    loadisFromInstruction(1, t0)
    loadConstantOrVariableCell(t0, t1, .opPutByValSlow)
    loadpFromInstruction(4, t3)
    move t1, t2
    arrayProfile(t2, t3, t0)
    loadisFromInstruction(2, t0)
    loadConstantOrVariableInt32(t0, t3, .opPutByValSlow)
    sxi2q t3, t3
    loadCaged(_g_gigacageBasePtrs + Gigacage::BasePtrs::jsValue, constexpr JSVALUE_GIGACAGE_MASK, JSObject::m_butterfly[t1], t0, t5)
    andi IndexingShapeMask, t2
    bineq t2, Int32Shape, .opPutByValNotInt32
    contiguousPutByVal(
        macro (operand, scratch, address)
            loadConstantOrVariable(operand, scratch)
            bpb scratch, tagTypeNumber, .opPutByValSlow
            storep scratch, address
            writeBarrierOnOperands(1, 3)
        end)

.opPutByValNotInt32:
    bineq t2, DoubleShape, .opPutByValNotDouble
    contiguousPutByVal(
        macro (operand, scratch, address)
            loadConstantOrVariable(operand, scratch)
            bqb scratch, tagTypeNumber, .notInt
            ci2d scratch, ft0
            jmp .ready
        .notInt:
            addp tagTypeNumber, scratch
            fq2d scratch, ft0
            bdnequn ft0, ft0, .opPutByValSlow
        .ready:
            stored ft0, address
            writeBarrierOnOperands(1, 3)
        end)

.opPutByValNotDouble:
    bineq t2, ContiguousShape, .opPutByValNotContiguous
    contiguousPutByVal(
        macro (operand, scratch, address)
            loadConstantOrVariable(operand, scratch)
            storep scratch, address
            writeBarrierOnOperands(1, 3)
        end)

.opPutByValNotContiguous:
    bineq t2, ArrayStorageShape, .opPutByValSlow
    biaeq t3, -sizeof IndexingHeader + IndexingHeader::u.lengths.vectorLength[t0], .opPutByValOutOfBounds
    btqz ArrayStorage::m_vector[t0, t3, 8], .opPutByValArrayStorageEmpty
.opPutByValArrayStorageStoreResult:
    loadisFromInstruction(3, t2)
    loadConstantOrVariable(t2, t1)
    storeq t1, ArrayStorage::m_vector[t0, t3, 8]
    writeBarrierOnOperands(1, 3)
    dispatch(5)

.opPutByValArrayStorageEmpty:
    loadpFromInstruction(4, t1)
    storeb 1, ArrayProfile::m_mayStoreToHole[t1]
    addi 1, ArrayStorage::m_numValuesInVector[t0]
    bib t3, -sizeof IndexingHeader + IndexingHeader::u.lengths.publicLength[t0], .opPutByValArrayStorageStoreResult
    addi 1, t3, t1
    storei t1, -sizeof IndexingHeader + IndexingHeader::u.lengths.publicLength[t0]
    jmp .opPutByValArrayStorageStoreResult

.opPutByValOutOfBounds:
    loadpFromInstruction(4, t0)
    storeb 1, ArrayProfile::m_outOfBounds[t0]
.opPutByValSlow:
    callSlowPath(slowPath)
    dispatch(5)
end

_llint_op_put_by_val:
    putByVal(_llint_slow_path_put_by_val)

_llint_op_put_by_val_direct:
    putByVal(_llint_slow_path_put_by_val_direct)


_llint_op_jmp:
    traceExecution()
    dispatchIntIndirect(1)


macro jumpTrueOrFalse(conditionOp, slow)
    loadisFromInstruction(1, t1)
    loadConstantOrVariable(t1, t0)
    xorq ValueFalse, t0
    btqnz t0, -1, .slow
    conditionOp(t0, .target)
    dispatch(3)

.target:
    dispatchIntIndirect(2)

.slow:
    callSlowPath(slow)
    dispatch(0)
end


macro equalNull(cellHandler, immediateHandler)
    loadisFromInstruction(1, t0)
    assertNotConstant(t0)
    loadq [cfr, t0, 8], t0
    btqnz t0, tagMask, .immediate
    loadStructureWithScratch(t0, t2, t1, t3)
    cellHandler(t2, JSCell::m_flags[t0], .target)
    dispatch(3)

.target:
    dispatchIntIndirect(2)

.immediate:
    andq ~TagBitUndefined, t0
    immediateHandler(t0, .target)
    dispatch(3)
end

_llint_op_jeq_null:
    traceExecution()
    equalNull(
        macro (structure, value, target) 
            btbz value, MasqueradesAsUndefined, .notMasqueradesAsUndefined
            loadp CodeBlock[cfr], t0
            loadp CodeBlock::m_globalObject[t0], t0
            bpeq Structure::m_globalObject[structure], t0, target
.notMasqueradesAsUndefined:
        end,
        macro (value, target) bqeq value, ValueNull, target end)


_llint_op_jneq_null:
    traceExecution()
    equalNull(
        macro (structure, value, target) 
            btbz value, MasqueradesAsUndefined, target
            loadp CodeBlock[cfr], t0
            loadp CodeBlock::m_globalObject[t0], t0
            bpneq Structure::m_globalObject[structure], t0, target
        end,
        macro (value, target) bqneq value, ValueNull, target end)


_llint_op_jneq_ptr:
    traceExecution()
    loadisFromInstruction(1, t0)
    loadisFromInstruction(2, t1)
    loadp CodeBlock[cfr], t2
    loadp CodeBlock::m_globalObject[t2], t2
    loadp JSGlobalObject::m_specialPointers[t2, t1, 8], t1
    bpneq t1, [cfr, t0, 8], .opJneqPtrTarget
    dispatch(5)

.opJneqPtrTarget:
    storei 1, 32[PB, PC, 8]
    dispatchIntIndirect(3)


macro compareJump(integerCompare, doubleCompare, slowPath)
    loadisFromInstruction(1, t2)
    loadisFromInstruction(2, t3)
    loadConstantOrVariable(t2, t0)
    loadConstantOrVariable(t3, t1)
    bqb t0, tagTypeNumber, .op1NotInt
    bqb t1, tagTypeNumber, .op2NotInt
    integerCompare(t0, t1, .jumpTarget)
    dispatch(4)

.op1NotInt:
    btqz t0, tagTypeNumber, .slow
    bqb t1, tagTypeNumber, .op1NotIntOp2NotInt
    ci2d t1, ft1
    jmp .op1NotIntReady
.op1NotIntOp2NotInt:
    btqz t1, tagTypeNumber, .slow
    addq tagTypeNumber, t1
    fq2d t1, ft1
.op1NotIntReady:
    addq tagTypeNumber, t0
    fq2d t0, ft0
    doubleCompare(ft0, ft1, .jumpTarget)
    dispatch(4)

.op2NotInt:
    ci2d t0, ft0
    btqz t1, tagTypeNumber, .slow
    addq tagTypeNumber, t1
    fq2d t1, ft1
    doubleCompare(ft0, ft1, .jumpTarget)
    dispatch(4)

.jumpTarget:
    dispatchIntIndirect(3)

.slow:
    callSlowPath(slowPath)
    dispatch(0)
end


macro compareUnsignedJump(integerCompare)
    loadisFromInstruction(1, t2)
    loadisFromInstruction(2, t3)
    loadConstantOrVariable(t2, t0)
    loadConstantOrVariable(t3, t1)
    integerCompare(t0, t1, .jumpTarget)
    dispatch(4)

.jumpTarget:
    dispatchIntIndirect(3)
end


macro compareUnsigned(integerCompareAndSet)
    loadisFromInstruction(3, t0)
    loadisFromInstruction(2, t2)
    loadisFromInstruction(1, t3)
    loadConstantOrVariable(t0, t1)
    loadConstantOrVariable(t2, t0)
    integerCompareAndSet(t0, t1, t0)
    orq ValueFalse, t0
    storeq t0, [cfr, t3, 8]
    dispatch(4)
end


_llint_op_switch_imm:
    traceExecution()
    loadisFromInstruction(3, t2)
    loadisFromInstruction(1, t3)
    loadConstantOrVariable(t2, t1)
    loadp CodeBlock[cfr], t2
    loadp CodeBlock::m_rareData[t2], t2
    muli sizeof SimpleJumpTable, t3    # FIXME: would be nice to peephole this!
    loadp CodeBlock::RareData::m_switchJumpTables + VectorBufferOffset[t2], t2
    addp t3, t2
    bqb t1, tagTypeNumber, .opSwitchImmNotInt
    subi SimpleJumpTable::min[t2], t1
    biaeq t1, SimpleJumpTable::branchOffsets + VectorSizeOffset[t2], .opSwitchImmFallThrough
    loadp SimpleJumpTable::branchOffsets + VectorBufferOffset[t2], t3
    loadis [t3, t1, 4], t1
    btiz t1, .opSwitchImmFallThrough
    dispatch(t1)

.opSwitchImmNotInt:
    btqnz t1, tagTypeNumber, .opSwitchImmSlow   # Go slow if it's a double.
.opSwitchImmFallThrough:
    dispatchIntIndirect(2)

.opSwitchImmSlow:
    callSlowPath(_llint_slow_path_switch_imm)
    dispatch(0)


_llint_op_switch_char:
    traceExecution()
    loadisFromInstruction(3, t2)
    loadisFromInstruction(1, t3)
    loadConstantOrVariable(t2, t1)
    loadp CodeBlock[cfr], t2
    loadp CodeBlock::m_rareData[t2], t2
    muli sizeof SimpleJumpTable, t3
    loadp CodeBlock::RareData::m_switchJumpTables + VectorBufferOffset[t2], t2
    addp t3, t2
    btqnz t1, tagMask, .opSwitchCharFallThrough
    bbneq JSCell::m_type[t1], StringType, .opSwitchCharFallThrough
    bineq JSString::m_length[t1], 1, .opSwitchCharFallThrough
    loadp JSString::m_value[t1], t0
    btpz  t0, .opSwitchOnRope
    loadp StringImpl::m_data8[t0], t1
    btinz StringImpl::m_hashAndFlags[t0], HashFlags8BitBuffer, .opSwitchChar8Bit
    loadh [t1], t0
    jmp .opSwitchCharReady
.opSwitchChar8Bit:
    loadb [t1], t0
.opSwitchCharReady:
    subi SimpleJumpTable::min[t2], t0
    biaeq t0, SimpleJumpTable::branchOffsets + VectorSizeOffset[t2], .opSwitchCharFallThrough
    loadp SimpleJumpTable::branchOffsets + VectorBufferOffset[t2], t2
    loadis [t2, t0, 4], t1
    btiz t1, .opSwitchCharFallThrough
    dispatch(t1)

.opSwitchCharFallThrough:
    dispatchIntIndirect(2)

.opSwitchOnRope:
    callSlowPath(_llint_slow_path_switch_char)
    dispatch(0)


macro arrayProfileForCall()
    loadisFromInstruction(4, t3)
    negp t3
    loadq ThisArgumentOffset[cfr, t3, 8], t0
    btqnz t0, tagMask, .done
    loadpFromInstruction((CallOpCodeSize - 2), t1)
    loadi JSCell::m_structureID[t0], t3
    storei t3, ArrayProfile::m_lastSeenStructureID[t1]
.done:
end

macro doCall(slowPath, prepareCall)
    loadisFromInstruction(2, t0)
    loadpFromInstruction(5, t1)
    if POINTER_PROFILING
        move t1, t5
    end
    loadp LLIntCallLinkInfo::callee[t1], t2
    loadConstantOrVariable(t0, t3)
    bqneq t3, t2, .opCallSlow
    loadisFromInstruction(4, t3)
    lshifti 3, t3
    negp t3
    addp cfr, t3
    storeq t2, Callee[t3]
    loadisFromInstruction(3, t2)
    storei PC, ArgumentCount + TagOffset[cfr]
    storei t2, ArgumentCount + PayloadOffset[t3]
    move t3, sp
    if POISON
        loadp _g_JITCodePoison, t2
        xorp LLIntCallLinkInfo::machineCodeTarget[t1], t2
        prepareCall(t2, t1, t3, t4, macro (callPtrTag)
            if POINTER_PROFILING
                loadp LLIntCallLinkInfo::callPtrTag[t5], callPtrTag
            end
        end)
        if POINTER_PROFILING
            loadp LLIntCallLinkInfo::callPtrTag[t5], t3
        end
        callTargetFunction(t2, t3)
    else
        prepareCall(LLIntCallLinkInfo::machineCodeTarget[t1], t2, t3, t4, macro (callPtrTag)
            if POINTER_PROFILING
                loadp LLIntCallLinkInfo::callPtrTag[t5], callPtrTag
            end
        end)
        if POINTER_PROFILING
            loadp LLIntCallLinkInfo::callPtrTag[t5], t3
        end
        callTargetFunction(LLIntCallLinkInfo::machineCodeTarget[t1], t3)
    end

.opCallSlow:
    slowPathForCall(slowPath, prepareCall)
end

_llint_op_ret:
    traceExecution()
    checkSwitchToJITForEpilogue()
    loadisFromInstruction(1, t2)
    loadConstantOrVariable(t2, r0)
    doReturn()


_llint_op_to_primitive:
    traceExecution()
    loadisFromInstruction(2, t2)
    loadisFromInstruction(1, t3)
    loadConstantOrVariable(t2, t0)
    btqnz t0, tagMask, .opToPrimitiveIsImm
    bbaeq JSCell::m_type[t0], ObjectType, .opToPrimitiveSlowCase
.opToPrimitiveIsImm:
    storeq t0, [cfr, t3, 8]
    dispatch(constexpr op_to_primitive_length)

.opToPrimitiveSlowCase:
    callSlowPath(_slow_path_to_primitive)
    dispatch(constexpr op_to_primitive_length)


_llint_op_catch:
    # This is where we end up from the JIT's throw trampoline (because the
    # machine code return address will be set to _llint_op_catch), and from
    # the interpreter's throw trampoline (see _llint_throw_trampoline).
    # The throwing code must have known that we were throwing to the interpreter,
    # and have set VM::targetInterpreterPCForThrow.
    loadp Callee[cfr], t3
    andp MarkedBlockMask, t3
    loadp MarkedBlockFooterOffset + MarkedBlock::Footer::m_vm[t3], t3
    restoreCalleeSavesFromVMEntryFrameCalleeSavesBuffer(t3, t0)
    loadp VM::callFrameForCatch[t3], cfr
    storep 0, VM::callFrameForCatch[t3]
    restoreStackPointerAfterCall()

    loadp CodeBlock[cfr], PB
    loadp CodeBlock::m_instructions[PB], PB
    unpoison(_g_CodeBlockPoison, PB, t2)
    loadp VM::targetInterpreterPCForThrow[t3], PC
    subp PB, PC
    rshiftp 3, PC

    callSlowPath(_llint_slow_path_check_if_exception_is_uncatchable_and_notify_profiler)
    bpeq r1, 0, .isCatchableException
    jmp _llint_throw_from_slow_path_trampoline

.isCatchableException:
    loadp Callee[cfr], t3
    andp MarkedBlockMask, t3
    loadp MarkedBlockFooterOffset + MarkedBlock::Footer::m_vm[t3], t3

    loadq VM::m_exception[t3], t0
    storeq 0, VM::m_exception[t3]
    loadisFromInstruction(1, t2)
    storeq t0, [cfr, t2, 8]

    loadq Exception::m_value[t0], t3
    loadisFromInstruction(2, t2)
    storeq t3, [cfr, t2, 8]

    traceExecution()

    callSlowPath(_llint_slow_path_profile_catch)

    dispatch(constexpr op_catch_length)


_llint_op_end:
    traceExecution()
    checkSwitchToJITForEpilogue()
    loadisFromInstruction(1, t0)
    assertNotConstant(t0)
    loadq [cfr, t0, 8], r0
    doReturn()


_llint_throw_from_slow_path_trampoline:
    loadp Callee[cfr], t1
    andp MarkedBlockMask, t1
    loadp MarkedBlockFooterOffset + MarkedBlock::Footer::m_vm[t1], t1
    copyCalleeSavesToVMEntryFrameCalleeSavesBuffer(t1, t2)

    callSlowPath(_llint_slow_path_handle_exception)

    # When throwing from the interpreter (i.e. throwing from LLIntSlowPaths), so
    # the throw target is not necessarily interpreted code, we come to here.
    # This essentially emulates the JIT's throwing protocol.
    loadp Callee[cfr], t1
    andp MarkedBlockMask, t1
    loadp MarkedBlockFooterOffset + MarkedBlock::Footer::m_vm[t1], t1
    jmp VM::targetMachinePCForThrow[t1], ExceptionHandlerPtrTag


_llint_throw_during_call_trampoline:
    preserveReturnAddressAfterCall(t2)
    jmp _llint_throw_from_slow_path_trampoline


macro nativeCallTrampoline(executableOffsetToFunction)

    functionPrologue()
    storep 0, CodeBlock[cfr]
    loadp Callee[cfr], t0
    andp MarkedBlockMask, t0, t1
    loadp MarkedBlockFooterOffset + MarkedBlock::Footer::m_vm[t1], t1
    storep cfr, VM::topCallFrame[t1]
    if ARM64 or ARM64E or C_LOOP
        storep lr, ReturnPC[cfr]
    end
    move cfr, a0
    loadp Callee[cfr], t1
    loadp JSFunction::m_executable[t1], t1
    unpoison(_g_JSFunctionPoison, t1, t2)
    checkStackPointerAlignment(t3, 0xdead0001)
    if C_LOOP
        loadp _g_NativeCodePoison, t2
        xorp executableOffsetToFunction[t1], t2
        cloopCallNative t2
    else
        if X86_64_WIN
            subp 32, sp
            call executableOffsetToFunction[t1], NativeCodePtrTag
            addp 32, sp
        else
            loadp _g_NativeCodePoison, t2
            xorp executableOffsetToFunction[t1], t2
            call t2, NativeCodePtrTag
        end
    end

    loadp Callee[cfr], t3
    andp MarkedBlockMask, t3
    loadp MarkedBlockFooterOffset + MarkedBlock::Footer::m_vm[t3], t3

    btqnz VM::m_exception[t3], .handleException

    functionEpilogue()
    ret

.handleException:
    storep cfr, VM::topCallFrame[t3]
    jmp _llint_throw_from_slow_path_trampoline
end

macro internalFunctionCallTrampoline(offsetOfFunction)
    functionPrologue()
    storep 0, CodeBlock[cfr]
    loadp Callee[cfr], t0
    andp MarkedBlockMask, t0, t1
    loadp MarkedBlockFooterOffset + MarkedBlock::Footer::m_vm[t1], t1
    storep cfr, VM::topCallFrame[t1]
    if ARM64 or ARM64E or C_LOOP
        storep lr, ReturnPC[cfr]
    end
    move cfr, a0
    loadp Callee[cfr], t1
    checkStackPointerAlignment(t3, 0xdead0001)
    if C_LOOP
        loadp _g_NativeCodePoison, t2
        xorp offsetOfFunction[t1], t2
        cloopCallNative t2
    else
        if X86_64_WIN
            subp 32, sp
            call offsetOfFunction[t1], NativeCodePtrTag
            addp 32, sp
        else
            loadp _g_NativeCodePoison, t2
            xorp offsetOfFunction[t1], t2
            call t2, NativeCodePtrTag
        end
    end

    loadp Callee[cfr], t3
    andp MarkedBlockMask, t3
    loadp MarkedBlockFooterOffset + MarkedBlock::Footer::m_vm[t3], t3

    btqnz VM::m_exception[t3], .handleException

    functionEpilogue()
    ret

.handleException:
    storep cfr, VM::topCallFrame[t3]
    jmp _llint_throw_from_slow_path_trampoline
end

macro getConstantScope(dst)
    loadpFromInstruction(6, t0)
    loadisFromInstruction(dst, t1)
    storeq t0, [cfr, t1, 8]
end

macro varInjectionCheck(slowPath)
    loadp CodeBlock[cfr], t0
    loadp CodeBlock::m_globalObject[t0], t0
    loadp JSGlobalObject::m_varInjectionWatchpoint[t0], t0
    bbeq WatchpointSet::m_state[t0], IsInvalidated, slowPath
end

macro resolveScope()
    loadisFromInstruction(5, t2)
    loadisFromInstruction(2, t0)
    loadp [cfr, t0, 8], t0
    btiz t2, .resolveScopeLoopEnd

.resolveScopeLoop:
    loadp JSScope::m_next[t0], t0
    subi 1, t2
    btinz t2, .resolveScopeLoop

.resolveScopeLoopEnd:
    loadisFromInstruction(1, t1)
    storeq t0, [cfr, t1, 8]
end


_llint_op_resolve_scope:
    traceExecution()
    loadisFromInstruction(4, t0)

#rGlobalProperty:
    bineq t0, GlobalProperty, .rGlobalVar
    getConstantScope(1)
    dispatch(constexpr op_resolve_scope_length)

.rGlobalVar:
    bineq t0, GlobalVar, .rGlobalLexicalVar
    getConstantScope(1)
    dispatch(constexpr op_resolve_scope_length)

.rGlobalLexicalVar:
    bineq t0, GlobalLexicalVar, .rClosureVar
    getConstantScope(1)
    dispatch(constexpr op_resolve_scope_length)

.rClosureVar:
    bineq t0, ClosureVar, .rModuleVar
    resolveScope()
    dispatch(constexpr op_resolve_scope_length)

.rModuleVar:
    bineq t0, ModuleVar, .rGlobalPropertyWithVarInjectionChecks
    getConstantScope(1)
    dispatch(constexpr op_resolve_scope_length)

.rGlobalPropertyWithVarInjectionChecks:
    bineq t0, GlobalPropertyWithVarInjectionChecks, .rGlobalVarWithVarInjectionChecks
    varInjectionCheck(.rDynamic)
    getConstantScope(1)
    dispatch(constexpr op_resolve_scope_length)

.rGlobalVarWithVarInjectionChecks:
    bineq t0, GlobalVarWithVarInjectionChecks, .rGlobalLexicalVarWithVarInjectionChecks
    varInjectionCheck(.rDynamic)
    getConstantScope(1)
    dispatch(constexpr op_resolve_scope_length)

.rGlobalLexicalVarWithVarInjectionChecks:
    bineq t0, GlobalLexicalVarWithVarInjectionChecks, .rClosureVarWithVarInjectionChecks
    varInjectionCheck(.rDynamic)
    getConstantScope(1)
    dispatch(constexpr op_resolve_scope_length)

.rClosureVarWithVarInjectionChecks:
    bineq t0, ClosureVarWithVarInjectionChecks, .rDynamic
    varInjectionCheck(.rDynamic)
    resolveScope()
    dispatch(constexpr op_resolve_scope_length)

.rDynamic:
    callSlowPath(_slow_path_resolve_scope)
    dispatch(constexpr op_resolve_scope_length)


macro loadWithStructureCheck(operand, slowPath)
    loadisFromInstruction(operand, t0)
    loadq [cfr, t0, 8], t0
    loadStructureWithScratch(t0, t2, t1, t3)
    loadpFromInstruction(5, t1)
    bpneq t2, t1, slowPath
end

macro getProperty()
    loadisFromInstruction(6, t1)
    loadPropertyAtVariableOffset(t1, t0, t2)
    valueProfile(t2, 7, t0)
    loadisFromInstruction(1, t0)
    storeq t2, [cfr, t0, 8]
end

macro getGlobalVar(tdzCheckIfNecessary)
    loadpFromInstruction(6, t0)
    loadq [t0], t0
    tdzCheckIfNecessary(t0)
    valueProfile(t0, 7, t1)
    loadisFromInstruction(1, t1)
    storeq t0, [cfr, t1, 8]
end

macro getClosureVar()
    loadisFromInstruction(6, t1)
    loadq JSLexicalEnvironment_variables[t0, t1, 8], t0
    valueProfile(t0, 7, t1)
    loadisFromInstruction(1, t1)
    storeq t0, [cfr, t1, 8]
end

_llint_op_get_from_scope:
    traceExecution()
    loadisFromInstruction(4, t0)
    andi ResolveTypeMask, t0

#gGlobalProperty:
    bineq t0, GlobalProperty, .gGlobalVar
    loadWithStructureCheck(2, .gDynamic)
    getProperty()
    dispatch(constexpr op_get_from_scope_length)

.gGlobalVar:
    bineq t0, GlobalVar, .gGlobalLexicalVar
    getGlobalVar(macro(v) end)
    dispatch(constexpr op_get_from_scope_length)

.gGlobalLexicalVar:
    bineq t0, GlobalLexicalVar, .gClosureVar
    getGlobalVar(
        macro (value)
            bqeq value, ValueEmpty, .gDynamic
        end)
    dispatch(constexpr op_get_from_scope_length)

.gClosureVar:
    bineq t0, ClosureVar, .gGlobalPropertyWithVarInjectionChecks
    loadVariable(2, t0)
    getClosureVar()
    dispatch(constexpr op_get_from_scope_length)

.gGlobalPropertyWithVarInjectionChecks:
    bineq t0, GlobalPropertyWithVarInjectionChecks, .gGlobalVarWithVarInjectionChecks
    loadWithStructureCheck(2, .gDynamic)
    getProperty()
    dispatch(constexpr op_get_from_scope_length)

.gGlobalVarWithVarInjectionChecks:
    bineq t0, GlobalVarWithVarInjectionChecks, .gGlobalLexicalVarWithVarInjectionChecks
    varInjectionCheck(.gDynamic)
    getGlobalVar(macro(v) end)
    dispatch(constexpr op_get_from_scope_length)

.gGlobalLexicalVarWithVarInjectionChecks:
    bineq t0, GlobalLexicalVarWithVarInjectionChecks, .gClosureVarWithVarInjectionChecks
    varInjectionCheck(.gDynamic)
    getGlobalVar(
        macro (value)
            bqeq value, ValueEmpty, .gDynamic
        end)
    dispatch(constexpr op_get_from_scope_length)

.gClosureVarWithVarInjectionChecks:
    bineq t0, ClosureVarWithVarInjectionChecks, .gDynamic
    varInjectionCheck(.gDynamic)
    loadVariable(2, t0)
    getClosureVar()
    dispatch(constexpr op_get_from_scope_length)

.gDynamic:
    callSlowPath(_llint_slow_path_get_from_scope)
    dispatch(constexpr op_get_from_scope_length)


macro putProperty()
    loadisFromInstruction(3, t1)
    loadConstantOrVariable(t1, t2)
    loadisFromInstruction(6, t1)
    storePropertyAtVariableOffset(t1, t0, t2)
end

macro putGlobalVariable()
    loadisFromInstruction(3, t0)
    loadConstantOrVariable(t0, t1)
    loadpFromInstruction(5, t2)
    loadpFromInstruction(6, t0)
    notifyWrite(t2, .pDynamic)
    storeq t1, [t0]
end

macro putClosureVar()
    loadisFromInstruction(3, t1)
    loadConstantOrVariable(t1, t2)
    loadisFromInstruction(6, t1)
    storeq t2, JSLexicalEnvironment_variables[t0, t1, 8]
end

macro putLocalClosureVar()
    loadisFromInstruction(3, t1)
    loadConstantOrVariable(t1, t2)
    loadpFromInstruction(5, t3)
    btpz t3, .noVariableWatchpointSet
    notifyWrite(t3, .pDynamic)
.noVariableWatchpointSet:
    loadisFromInstruction(6, t1)
    storeq t2, JSLexicalEnvironment_variables[t0, t1, 8]
end

macro checkTDZInGlobalPutToScopeIfNecessary()
    loadisFromInstruction(4, t0)
    andi InitializationModeMask, t0
    rshifti InitializationModeShift, t0
    bineq t0, NotInitialization, .noNeedForTDZCheck
    loadpFromInstruction(6, t0)
    loadq [t0], t0
    bqeq t0, ValueEmpty, .pDynamic
.noNeedForTDZCheck:
end


_llint_op_put_to_scope:
    traceExecution()
    loadisFromInstruction(4, t0)
    andi ResolveTypeMask, t0

#pLocalClosureVar:
    bineq t0, LocalClosureVar, .pGlobalProperty
    loadVariable(1, t0)
    putLocalClosureVar()
    writeBarrierOnOperands(1, 3)
    dispatch(constexpr op_put_to_scope_length)

.pGlobalProperty:
    bineq t0, GlobalProperty, .pGlobalVar
    loadWithStructureCheck(1, .pDynamic)
    putProperty()
    writeBarrierOnOperands(1, 3)
    dispatch(constexpr op_put_to_scope_length)

.pGlobalVar:
    bineq t0, GlobalVar, .pGlobalLexicalVar
    writeBarrierOnGlobalObject(3)
    putGlobalVariable()
    dispatch(constexpr op_put_to_scope_length)

.pGlobalLexicalVar:
    bineq t0, GlobalLexicalVar, .pClosureVar
    writeBarrierOnGlobalLexicalEnvironment(3)
    checkTDZInGlobalPutToScopeIfNecessary()
    putGlobalVariable()
    dispatch(constexpr op_put_to_scope_length)

.pClosureVar:
    bineq t0, ClosureVar, .pGlobalPropertyWithVarInjectionChecks
    loadVariable(1, t0)
    putClosureVar()
    writeBarrierOnOperands(1, 3)
    dispatch(constexpr op_put_to_scope_length)

.pGlobalPropertyWithVarInjectionChecks:
    bineq t0, GlobalPropertyWithVarInjectionChecks, .pGlobalVarWithVarInjectionChecks
    loadWithStructureCheck(1, .pDynamic)
    putProperty()
    writeBarrierOnOperands(1, 3)
    dispatch(constexpr op_put_to_scope_length)

.pGlobalVarWithVarInjectionChecks:
    bineq t0, GlobalVarWithVarInjectionChecks, .pGlobalLexicalVarWithVarInjectionChecks
    writeBarrierOnGlobalObject(3)
    varInjectionCheck(.pDynamic)
    putGlobalVariable()
    dispatch(constexpr op_put_to_scope_length)

.pGlobalLexicalVarWithVarInjectionChecks:
    bineq t0, GlobalLexicalVarWithVarInjectionChecks, .pClosureVarWithVarInjectionChecks
    writeBarrierOnGlobalLexicalEnvironment(3)
    varInjectionCheck(.pDynamic)
    checkTDZInGlobalPutToScopeIfNecessary()
    putGlobalVariable()
    dispatch(constexpr op_put_to_scope_length)

.pClosureVarWithVarInjectionChecks:
    bineq t0, ClosureVarWithVarInjectionChecks, .pModuleVar
    varInjectionCheck(.pDynamic)
    loadVariable(1, t0)
    putClosureVar()
    writeBarrierOnOperands(1, 3)
    dispatch(constexpr op_put_to_scope_length)

.pModuleVar:
    bineq t0, ModuleVar, .pDynamic
    callSlowPath(_slow_path_throw_strict_mode_readonly_property_write_error)
    dispatch(constexpr op_put_to_scope_length)

.pDynamic:
    callSlowPath(_llint_slow_path_put_to_scope)
    dispatch(constexpr op_put_to_scope_length)


_llint_op_get_from_arguments:
    traceExecution()
    loadVariable(2, t0)
    loadi 24[PB, PC, 8], t1
    loadp DirectArguments::m_storage[t0], t0
    unpoison(_g_DirectArgumentsPoison, t0, t3)
    loadq [t0, t1, 8], t0
    valueProfile(t0, 4, t1)
    loadisFromInstruction(1, t1)
    storeq t0, [cfr, t1, 8]
    dispatch(constexpr op_get_from_arguments_length)


_llint_op_put_to_arguments:
    traceExecution()
    loadVariable(1, t0)
    loadi 16[PB, PC, 8], t1
    loadisFromInstruction(3, t3)
    loadConstantOrVariable(t3, t2)
    loadp DirectArguments::m_storage[t0], t0
    unpoison(_g_DirectArgumentsPoison, t0, t3)
    storeq t2, [t0, t1, 8]
    writeBarrierOnOperands(1, 3)
    dispatch(constexpr op_put_to_arguments_length)


_llint_op_get_parent_scope:
    traceExecution()
    loadVariable(2, t0)
    loadp JSScope::m_next[t0], t0
    loadisFromInstruction(1, t1)
    storeq t0, [cfr, t1, 8]
    dispatch(constexpr op_get_parent_scope_length)


_llint_op_profile_type:
    traceExecution()
    loadp CodeBlock[cfr], t1
    loadp CodeBlock::m_poisonedVM[t1], t1
    unpoison(_g_CodeBlockPoison, t1, t3)
    # t1 is holding the pointer to the typeProfilerLog.
    loadp VM::m_typeProfilerLog[t1], t1
    # t2 is holding the pointer to the current log entry.
    loadp TypeProfilerLog::m_currentLogEntryPtr[t1], t2

    # t0 is holding the JSValue argument.
    loadisFromInstruction(1, t3)
    loadConstantOrVariable(t3, t0)

    bqeq t0, ValueEmpty, .opProfileTypeDone
    # Store the JSValue onto the log entry.
    storeq t0, TypeProfilerLog::LogEntry::value[t2]
    
    # Store the TypeLocation onto the log entry.
    loadpFromInstruction(2, t3)
    storep t3, TypeProfilerLog::LogEntry::location[t2]

    btqz t0, tagMask, .opProfileTypeIsCell
    storei 0, TypeProfilerLog::LogEntry::structureID[t2]
    jmp .opProfileTypeSkipIsCell
.opProfileTypeIsCell:
    loadi JSCell::m_structureID[t0], t3
    storei t3, TypeProfilerLog::LogEntry::structureID[t2]
.opProfileTypeSkipIsCell:
    
    # Increment the current log entry.
    addp sizeof TypeProfilerLog::LogEntry, t2
    storep t2, TypeProfilerLog::m_currentLogEntryPtr[t1]

    loadp TypeProfilerLog::m_logEndPtr[t1], t1
    bpneq t2, t1, .opProfileTypeDone
    callSlowPath(_slow_path_profile_type_clear_log)

.opProfileTypeDone:
    dispatch(constexpr op_profile_type_length)

_llint_op_profile_control_flow:
    traceExecution()
    loadpFromInstruction(1, t0)
    addq 1, BasicBlockLocation::m_executionCount[t0]
    dispatch(constexpr op_profile_control_flow_length)


_llint_op_get_rest_length:
    traceExecution()
    loadi PayloadOffset + ArgumentCount[cfr], t0
    subi 1, t0
    loadisFromInstruction(2, t1)
    bilteq t0, t1, .storeZero
    subi t1, t0
    jmp .boxUp
.storeZero:
    move 0, t0
.boxUp:
    orq tagTypeNumber, t0
    loadisFromInstruction(1, t1)
    storeq t0, [cfr, t1, 8]
    dispatch(constexpr op_get_rest_length_length)


_llint_op_log_shadow_chicken_prologue:
    traceExecution()
    acquireShadowChickenPacket(.opLogShadowChickenPrologueSlow)
    storep cfr, ShadowChicken::Packet::frame[t0]
    loadp CallerFrame[cfr], t1
    storep t1, ShadowChicken::Packet::callerFrame[t0]
    loadp Callee[cfr], t1
    storep t1, ShadowChicken::Packet::callee[t0]
    loadVariable(1, t1)
    storep t1, ShadowChicken::Packet::scope[t0]
    dispatch(constexpr op_log_shadow_chicken_prologue_length)
.opLogShadowChickenPrologueSlow:
    callSlowPath(_llint_slow_path_log_shadow_chicken_prologue)
    dispatch(constexpr op_log_shadow_chicken_prologue_length)


_llint_op_log_shadow_chicken_tail:
    traceExecution()
    acquireShadowChickenPacket(.opLogShadowChickenTailSlow)
    storep cfr, ShadowChicken::Packet::frame[t0]
    storep ShadowChickenTailMarker, ShadowChicken::Packet::callee[t0]
    loadVariable(1, t1)
    storep t1, ShadowChicken::Packet::thisValue[t0]
    loadVariable(2, t1)
    storep t1, ShadowChicken::Packet::scope[t0]
    loadp CodeBlock[cfr], t1
    storep t1, ShadowChicken::Packet::codeBlock[t0]
    storei PC, ShadowChicken::Packet::callSiteIndex[t0]
    dispatch(constexpr op_log_shadow_chicken_tail_length)
.opLogShadowChickenTailSlow:
    callSlowPath(_llint_slow_path_log_shadow_chicken_tail)
    dispatch(constexpr op_log_shadow_chicken_tail_length)