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luau/CodeGen/src/IrLoweringX64.cpp
vegorov-rbx 218159140c
Sync to upstream/release/584 (#977) 
* Added support for async typechecking cancellation using a token passed
through frontend options
* Added luaC_enumheap for building debug tools that need a graph of Luau
heap

In our new typechecker:
* Errors or now suppressed when checking property lookup of
error-suppressing unions

In our native code generation (jit):
* Fixed unhandled value type in NOT_ANY lowering
* Fast-call tag checks will exit to VM on failure, instead of relying on
a native fallback
* Added vector type to the type information
* Eliminated redundant direct jumps across dead blocks
* Debugger APIs are now disabled for call frames executing natively
* Implemented support for unwind registration on macOS 14
2023-07-14 11:08:53 -07:00

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// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
#include "IrLoweringX64.h"
#include "Luau/CodeGen.h"
#include "Luau/DenseHash.h"
#include "Luau/IrAnalysis.h"
#include "Luau/IrCallWrapperX64.h"
#include "Luau/IrDump.h"
#include "Luau/IrUtils.h"
#include "EmitBuiltinsX64.h"
#include "EmitCommonX64.h"
#include "EmitInstructionX64.h"
#include "NativeState.h"
#include "lstate.h"
namespace Luau
{
namespace CodeGen
{
namespace X64
{
IrLoweringX64::IrLoweringX64(AssemblyBuilderX64& build, ModuleHelpers& helpers, IrFunction& function)
: build(build)
, helpers(helpers)
, function(function)
, regs(build, function)
, valueTracker(function)
, exitHandlerMap(~0u)
{
// In order to allocate registers during lowering, we need to know where instruction results are last used
updateLastUseLocations(function);
valueTracker.setRestoreCallack(&regs, [](void* context, IrInst& inst) {
((IrRegAllocX64*)context)->restore(inst, false);
});
build.align(kFunctionAlignment, X64::AlignmentDataX64::Ud2);
}
void IrLoweringX64::storeDoubleAsFloat(OperandX64 dst, IrOp src)
{
ScopedRegX64 tmp{regs, SizeX64::xmmword};
if (src.kind == IrOpKind::Constant)
{
build.vmovss(tmp.reg, build.f32(float(doubleOp(src))));
}
else if (src.kind == IrOpKind::Inst)
{
build.vcvtsd2ss(tmp.reg, regOp(src), regOp(src));
}
else
{
LUAU_ASSERT(!"Unsupported instruction form");
}
build.vmovss(dst, tmp.reg);
}
void IrLoweringX64::lowerInst(IrInst& inst, uint32_t index, IrBlock& next)
{
regs.currInstIdx = index;
valueTracker.beforeInstLowering(inst);
switch (inst.cmd)
{
case IrCmd::LOAD_TAG:
inst.regX64 = regs.allocReg(SizeX64::dword, index);
if (inst.a.kind == IrOpKind::VmReg)
build.mov(inst.regX64, luauRegTag(vmRegOp(inst.a)));
else if (inst.a.kind == IrOpKind::VmConst)
build.mov(inst.regX64, luauConstantTag(vmConstOp(inst.a)));
// If we have a register, we assume it's a pointer to TValue
// We might introduce explicit operand types in the future to make this more robust
else if (inst.a.kind == IrOpKind::Inst)
build.mov(inst.regX64, dword[regOp(inst.a) + offsetof(TValue, tt)]);
else
LUAU_ASSERT(!"Unsupported instruction form");
break;
case IrCmd::LOAD_POINTER:
inst.regX64 = regs.allocReg(SizeX64::qword, index);
if (inst.a.kind == IrOpKind::VmReg)
build.mov(inst.regX64, luauRegValue(vmRegOp(inst.a)));
else if (inst.a.kind == IrOpKind::VmConst)
build.mov(inst.regX64, luauConstantValue(vmConstOp(inst.a)));
// If we have a register, we assume it's a pointer to TValue
// We might introduce explicit operand types in the future to make this more robust
else if (inst.a.kind == IrOpKind::Inst)
build.mov(inst.regX64, qword[regOp(inst.a) + offsetof(TValue, value)]);
else
LUAU_ASSERT(!"Unsupported instruction form");
break;
case IrCmd::LOAD_DOUBLE:
inst.regX64 = regs.allocReg(SizeX64::xmmword, index);
if (inst.a.kind == IrOpKind::VmReg)
build.vmovsd(inst.regX64, luauRegValue(vmRegOp(inst.a)));
else if (inst.a.kind == IrOpKind::VmConst)
build.vmovsd(inst.regX64, luauConstantValue(vmConstOp(inst.a)));
else
LUAU_ASSERT(!"Unsupported instruction form");
break;
case IrCmd::LOAD_INT:
inst.regX64 = regs.allocReg(SizeX64::dword, index);
build.mov(inst.regX64, luauRegValueInt(vmRegOp(inst.a)));
break;
case IrCmd::LOAD_TVALUE:
inst.regX64 = regs.allocReg(SizeX64::xmmword, index);
if (inst.a.kind == IrOpKind::VmReg)
build.vmovups(inst.regX64, luauReg(vmRegOp(inst.a)));
else if (inst.a.kind == IrOpKind::VmConst)
build.vmovups(inst.regX64, luauConstant(vmConstOp(inst.a)));
else if (inst.a.kind == IrOpKind::Inst)
build.vmovups(inst.regX64, xmmword[regOp(inst.a)]);
else
LUAU_ASSERT(!"Unsupported instruction form");
break;
case IrCmd::LOAD_NODE_VALUE_TV:
inst.regX64 = regs.allocReg(SizeX64::xmmword, index);
build.vmovups(inst.regX64, luauNodeValue(regOp(inst.a)));
break;
case IrCmd::LOAD_ENV:
inst.regX64 = regs.allocReg(SizeX64::qword, index);
build.mov(inst.regX64, sClosure);
build.mov(inst.regX64, qword[inst.regX64 + offsetof(Closure, env)]);
break;
case IrCmd::GET_ARR_ADDR:
if (inst.b.kind == IrOpKind::Inst)
{
inst.regX64 = regs.allocRegOrReuse(SizeX64::qword, index, {inst.b});
if (dwordReg(inst.regX64) != regOp(inst.b))
build.mov(dwordReg(inst.regX64), regOp(inst.b));
build.shl(dwordReg(inst.regX64), kTValueSizeLog2);
build.add(inst.regX64, qword[regOp(inst.a) + offsetof(Table, array)]);
}
else if (inst.b.kind == IrOpKind::Constant)
{
inst.regX64 = regs.allocRegOrReuse(SizeX64::qword, index, {inst.a});
build.mov(inst.regX64, qword[regOp(inst.a) + offsetof(Table, array)]);
if (intOp(inst.b) != 0)
build.lea(inst.regX64, addr[inst.regX64 + intOp(inst.b) * sizeof(TValue)]);
}
else
{
LUAU_ASSERT(!"Unsupported instruction form");
}
break;
case IrCmd::GET_SLOT_NODE_ADDR:
{
inst.regX64 = regs.allocReg(SizeX64::qword, index);
ScopedRegX64 tmp{regs, SizeX64::qword};
getTableNodeAtCachedSlot(build, tmp.reg, inst.regX64, regOp(inst.a), uintOp(inst.b));
break;
}
case IrCmd::GET_HASH_NODE_ADDR:
{
// Custom bit shift value can only be placed in cl
ScopedRegX64 shiftTmp{regs, regs.takeReg(rcx, kInvalidInstIdx)};
inst.regX64 = regs.allocReg(SizeX64::qword, index);
ScopedRegX64 tmp{regs, SizeX64::qword};
build.mov(inst.regX64, qword[regOp(inst.a) + offsetof(Table, node)]);
build.mov(dwordReg(tmp.reg), 1);
build.mov(byteReg(shiftTmp.reg), byte[regOp(inst.a) + offsetof(Table, lsizenode)]);
build.shl(dwordReg(tmp.reg), byteReg(shiftTmp.reg));
build.dec(dwordReg(tmp.reg));
build.and_(dwordReg(tmp.reg), uintOp(inst.b));
build.shl(tmp.reg, kLuaNodeSizeLog2);
build.add(inst.regX64, tmp.reg);
break;
};
case IrCmd::STORE_TAG:
if (inst.b.kind == IrOpKind::Constant)
build.mov(luauRegTag(vmRegOp(inst.a)), tagOp(inst.b));
else
LUAU_ASSERT(!"Unsupported instruction form");
break;
case IrCmd::STORE_POINTER:
build.mov(luauRegValue(vmRegOp(inst.a)), regOp(inst.b));
break;
case IrCmd::STORE_DOUBLE:
if (inst.b.kind == IrOpKind::Constant)
{
ScopedRegX64 tmp{regs, SizeX64::xmmword};
build.vmovsd(tmp.reg, build.f64(doubleOp(inst.b)));
build.vmovsd(luauRegValue(vmRegOp(inst.a)), tmp.reg);
}
else if (inst.b.kind == IrOpKind::Inst)
{
build.vmovsd(luauRegValue(vmRegOp(inst.a)), regOp(inst.b));
}
else
{
LUAU_ASSERT(!"Unsupported instruction form");
}
break;
case IrCmd::STORE_INT:
if (inst.b.kind == IrOpKind::Constant)
build.mov(luauRegValueInt(vmRegOp(inst.a)), intOp(inst.b));
else if (inst.b.kind == IrOpKind::Inst)
build.mov(luauRegValueInt(vmRegOp(inst.a)), regOp(inst.b));
else
LUAU_ASSERT(!"Unsupported instruction form");
break;
case IrCmd::STORE_VECTOR:
storeDoubleAsFloat(luauRegValueVector(vmRegOp(inst.a), 0), inst.b);
storeDoubleAsFloat(luauRegValueVector(vmRegOp(inst.a), 1), inst.c);
storeDoubleAsFloat(luauRegValueVector(vmRegOp(inst.a), 2), inst.d);
break;
case IrCmd::STORE_TVALUE:
if (inst.a.kind == IrOpKind::VmReg)
build.vmovups(luauReg(vmRegOp(inst.a)), regOp(inst.b));
else if (inst.a.kind == IrOpKind::Inst)
build.vmovups(xmmword[regOp(inst.a)], regOp(inst.b));
else
LUAU_ASSERT(!"Unsupported instruction form");
break;
case IrCmd::STORE_NODE_VALUE_TV:
build.vmovups(luauNodeValue(regOp(inst.a)), regOp(inst.b));
break;
case IrCmd::ADD_INT:
{
inst.regX64 = regs.allocRegOrReuse(SizeX64::dword, index, {inst.a});
if (inst.a.kind == IrOpKind::Constant)
{
build.lea(inst.regX64, addr[regOp(inst.b) + intOp(inst.a)]);
}
else if (inst.a.kind == IrOpKind::Inst)
{
if (inst.regX64 == regOp(inst.a))
{
if (inst.b.kind == IrOpKind::Inst)
build.add(inst.regX64, regOp(inst.b));
else if (intOp(inst.b) == 1)
build.inc(inst.regX64);
else
build.add(inst.regX64, intOp(inst.b));
}
else
{
if (inst.b.kind == IrOpKind::Inst)
build.lea(inst.regX64, addr[regOp(inst.a) + regOp(inst.b)]);
else
build.lea(inst.regX64, addr[regOp(inst.a) + intOp(inst.b)]);
}
}
else
{
LUAU_ASSERT(!"Unsupported instruction form");
}
break;
}
case IrCmd::SUB_INT:
inst.regX64 = regs.allocRegOrReuse(SizeX64::dword, index, {inst.a});
if (inst.regX64 == regOp(inst.a) && intOp(inst.b) == 1)
build.dec(inst.regX64);
else if (inst.regX64 == regOp(inst.a))
build.sub(inst.regX64, intOp(inst.b));
else
build.lea(inst.regX64, addr[regOp(inst.a) - intOp(inst.b)]);
break;
case IrCmd::ADD_NUM:
inst.regX64 = regs.allocRegOrReuse(SizeX64::xmmword, index, {inst.a, inst.b});
if (inst.a.kind == IrOpKind::Constant)
{
ScopedRegX64 tmp{regs, SizeX64::xmmword};
build.vmovsd(tmp.reg, memRegDoubleOp(inst.a));
build.vaddsd(inst.regX64, tmp.reg, memRegDoubleOp(inst.b));
}
else
{
build.vaddsd(inst.regX64, regOp(inst.a), memRegDoubleOp(inst.b));
}
break;
case IrCmd::SUB_NUM:
inst.regX64 = regs.allocRegOrReuse(SizeX64::xmmword, index, {inst.a, inst.b});
if (inst.a.kind == IrOpKind::Constant)
{
ScopedRegX64 tmp{regs, SizeX64::xmmword};
build.vmovsd(tmp.reg, memRegDoubleOp(inst.a));
build.vsubsd(inst.regX64, tmp.reg, memRegDoubleOp(inst.b));
}
else
{
build.vsubsd(inst.regX64, regOp(inst.a), memRegDoubleOp(inst.b));
}
break;
case IrCmd::MUL_NUM:
inst.regX64 = regs.allocRegOrReuse(SizeX64::xmmword, index, {inst.a, inst.b});
if (inst.a.kind == IrOpKind::Constant)
{
ScopedRegX64 tmp{regs, SizeX64::xmmword};
build.vmovsd(tmp.reg, memRegDoubleOp(inst.a));
build.vmulsd(inst.regX64, tmp.reg, memRegDoubleOp(inst.b));
}
else
{
build.vmulsd(inst.regX64, regOp(inst.a), memRegDoubleOp(inst.b));
}
break;
case IrCmd::DIV_NUM:
inst.regX64 = regs.allocRegOrReuse(SizeX64::xmmword, index, {inst.a, inst.b});
if (inst.a.kind == IrOpKind::Constant)
{
ScopedRegX64 tmp{regs, SizeX64::xmmword};
build.vmovsd(tmp.reg, memRegDoubleOp(inst.a));
build.vdivsd(inst.regX64, tmp.reg, memRegDoubleOp(inst.b));
}
else
{
build.vdivsd(inst.regX64, regOp(inst.a), memRegDoubleOp(inst.b));
}
break;
case IrCmd::MOD_NUM:
{
inst.regX64 = regs.allocRegOrReuse(SizeX64::xmmword, index, {inst.a, inst.b});
ScopedRegX64 optLhsTmp{regs};
RegisterX64 lhs;
if (inst.a.kind == IrOpKind::Constant)
{
optLhsTmp.alloc(SizeX64::xmmword);
build.vmovsd(optLhsTmp.reg, memRegDoubleOp(inst.a));
lhs = optLhsTmp.reg;
}
else
{
lhs = regOp(inst.a);
}
if (inst.b.kind == IrOpKind::Inst)
{
ScopedRegX64 tmp{regs, SizeX64::xmmword};
build.vdivsd(tmp.reg, lhs, memRegDoubleOp(inst.b));
build.vroundsd(tmp.reg, tmp.reg, tmp.reg, RoundingModeX64::RoundToNegativeInfinity);
build.vmulsd(tmp.reg, tmp.reg, memRegDoubleOp(inst.b));
build.vsubsd(inst.regX64, lhs, tmp.reg);
}
else
{
ScopedRegX64 tmp1{regs, SizeX64::xmmword};
ScopedRegX64 tmp2{regs, SizeX64::xmmword};
build.vmovsd(tmp1.reg, memRegDoubleOp(inst.b));
build.vdivsd(tmp2.reg, lhs, tmp1.reg);
build.vroundsd(tmp2.reg, tmp2.reg, tmp2.reg, RoundingModeX64::RoundToNegativeInfinity);
build.vmulsd(tmp1.reg, tmp2.reg, tmp1.reg);
build.vsubsd(inst.regX64, lhs, tmp1.reg);
}
break;
}
case IrCmd::MIN_NUM:
inst.regX64 = regs.allocRegOrReuse(SizeX64::xmmword, index, {inst.a, inst.b});
if (inst.a.kind == IrOpKind::Constant)
{
ScopedRegX64 tmp{regs, SizeX64::xmmword};
build.vmovsd(tmp.reg, memRegDoubleOp(inst.a));
build.vminsd(inst.regX64, tmp.reg, memRegDoubleOp(inst.b));
}
else
{
build.vminsd(inst.regX64, regOp(inst.a), memRegDoubleOp(inst.b));
}
break;
case IrCmd::MAX_NUM:
inst.regX64 = regs.allocRegOrReuse(SizeX64::xmmword, index, {inst.a, inst.b});
if (inst.a.kind == IrOpKind::Constant)
{
ScopedRegX64 tmp{regs, SizeX64::xmmword};
build.vmovsd(tmp.reg, memRegDoubleOp(inst.a));
build.vmaxsd(inst.regX64, tmp.reg, memRegDoubleOp(inst.b));
}
else
{
build.vmaxsd(inst.regX64, regOp(inst.a), memRegDoubleOp(inst.b));
}
break;
case IrCmd::UNM_NUM:
{
inst.regX64 = regs.allocRegOrReuse(SizeX64::xmmword, index, {inst.a});
RegisterX64 src = regOp(inst.a);
if (inst.regX64 == src)
{
build.vxorpd(inst.regX64, inst.regX64, build.f64(-0.0));
}
else
{
build.vmovsd(inst.regX64, src, src);
build.vxorpd(inst.regX64, inst.regX64, build.f64(-0.0));
}
break;
}
case IrCmd::FLOOR_NUM:
inst.regX64 = regs.allocRegOrReuse(SizeX64::xmmword, index, {inst.a});
build.vroundsd(inst.regX64, inst.regX64, memRegDoubleOp(inst.a), RoundingModeX64::RoundToNegativeInfinity);
break;
case IrCmd::CEIL_NUM:
inst.regX64 = regs.allocRegOrReuse(SizeX64::xmmword, index, {inst.a});
build.vroundsd(inst.regX64, inst.regX64, memRegDoubleOp(inst.a), RoundingModeX64::RoundToPositiveInfinity);
break;
case IrCmd::ROUND_NUM:
{
inst.regX64 = regs.allocRegOrReuse(SizeX64::xmmword, index, {inst.a});
ScopedRegX64 tmp1{regs, SizeX64::xmmword};
ScopedRegX64 tmp2{regs, SizeX64::xmmword};
if (inst.a.kind != IrOpKind::Inst)
build.vmovsd(inst.regX64, memRegDoubleOp(inst.a));
else if (regOp(inst.a) != inst.regX64)
build.vmovsd(inst.regX64, inst.regX64, regOp(inst.a));
build.vandpd(tmp1.reg, inst.regX64, build.f64x2(-0.0, -0.0));
build.vmovsd(tmp2.reg, build.i64(0x3fdfffffffffffff)); // 0.49999999999999994
build.vorpd(tmp1.reg, tmp1.reg, tmp2.reg);
build.vaddsd(inst.regX64, inst.regX64, tmp1.reg);
build.vroundsd(inst.regX64, inst.regX64, inst.regX64, RoundingModeX64::RoundToZero);
break;
}
case IrCmd::SQRT_NUM:
inst.regX64 = regs.allocRegOrReuse(SizeX64::xmmword, index, {inst.a});
build.vsqrtsd(inst.regX64, inst.regX64, memRegDoubleOp(inst.a));
break;
case IrCmd::ABS_NUM:
inst.regX64 = regs.allocRegOrReuse(SizeX64::xmmword, index, {inst.a});
if (inst.a.kind != IrOpKind::Inst)
build.vmovsd(inst.regX64, memRegDoubleOp(inst.a));
else if (regOp(inst.a) != inst.regX64)
build.vmovsd(inst.regX64, inst.regX64, regOp(inst.a));
build.vandpd(inst.regX64, inst.regX64, build.i64(~(1LL << 63)));
break;
case IrCmd::NOT_ANY:
{
// TODO: if we have a single user which is a STORE_INT, we are missing the opportunity to write directly to target
inst.regX64 = regs.allocRegOrReuse(SizeX64::dword, index, {inst.a, inst.b});
Label saveone, savezero, exit;
if (inst.a.kind == IrOpKind::Constant)
{
// Other cases should've been constant folded
LUAU_ASSERT(tagOp(inst.a) == LUA_TBOOLEAN);
}
else
{
build.cmp(regOp(inst.a), LUA_TNIL);
build.jcc(ConditionX64::Equal, saveone);
build.cmp(regOp(inst.a), LUA_TBOOLEAN);
build.jcc(ConditionX64::NotEqual, savezero);
}
if (inst.b.kind == IrOpKind::Constant)
{
// If value is 1, we fallthrough to storing 0
if (intOp(inst.b) == 0)
build.jmp(saveone);
}
else
{
build.cmp(regOp(inst.b), 0);
build.jcc(ConditionX64::Equal, saveone);
}
build.setLabel(savezero);
build.mov(inst.regX64, 0);
build.jmp(exit);
build.setLabel(saveone);
build.mov(inst.regX64, 1);
build.setLabel(exit);
break;
}
case IrCmd::JUMP:
if (inst.a.kind == IrOpKind::VmExit)
{
if (uint32_t* index = exitHandlerMap.find(inst.a.index))
{
build.jmp(exitHandlers[*index].self);
}
else
{
Label self;
build.jmp(self);
exitHandlerMap[inst.a.index] = uint32_t(exitHandlers.size());
exitHandlers.push_back({self, inst.a.index});
}
}
else
{
jumpOrFallthrough(blockOp(inst.a), next);
}
break;
case IrCmd::JUMP_IF_TRUTHY:
jumpIfTruthy(build, vmRegOp(inst.a), labelOp(inst.b), labelOp(inst.c));
jumpOrFallthrough(blockOp(inst.c), next);
break;
case IrCmd::JUMP_IF_FALSY:
jumpIfFalsy(build, vmRegOp(inst.a), labelOp(inst.b), labelOp(inst.c));
jumpOrFallthrough(blockOp(inst.c), next);
break;
case IrCmd::JUMP_EQ_TAG:
{
LUAU_ASSERT(inst.b.kind == IrOpKind::Inst || inst.b.kind == IrOpKind::Constant);
OperandX64 opb = inst.b.kind == IrOpKind::Inst ? regOp(inst.b) : OperandX64(tagOp(inst.b));
build.cmp(memRegTagOp(inst.a), opb);
if (isFallthroughBlock(blockOp(inst.d), next))
{
build.jcc(ConditionX64::Equal, labelOp(inst.c));
jumpOrFallthrough(blockOp(inst.d), next);
}
else
{
build.jcc(ConditionX64::NotEqual, labelOp(inst.d));
jumpOrFallthrough(blockOp(inst.c), next);
}
break;
}
case IrCmd::JUMP_EQ_INT:
build.cmp(regOp(inst.a), intOp(inst.b));
build.jcc(ConditionX64::Equal, labelOp(inst.c));
jumpOrFallthrough(blockOp(inst.d), next);
break;
case IrCmd::JUMP_LT_INT:
build.cmp(regOp(inst.a), intOp(inst.b));
build.jcc(ConditionX64::Less, labelOp(inst.c));
jumpOrFallthrough(blockOp(inst.d), next);
break;
case IrCmd::JUMP_GE_UINT:
build.cmp(regOp(inst.a), unsigned(intOp(inst.b)));
build.jcc(ConditionX64::AboveEqual, labelOp(inst.c));
jumpOrFallthrough(blockOp(inst.d), next);
break;
case IrCmd::JUMP_EQ_POINTER:
build.cmp(regOp(inst.a), regOp(inst.b));
build.jcc(ConditionX64::Equal, labelOp(inst.c));
jumpOrFallthrough(blockOp(inst.d), next);
break;
case IrCmd::JUMP_CMP_NUM:
{
IrCondition cond = conditionOp(inst.c);
ScopedRegX64 tmp{regs, SizeX64::xmmword};
// TODO: jumpOnNumberCmp should work on IrCondition directly
jumpOnNumberCmp(build, tmp.reg, memRegDoubleOp(inst.a), memRegDoubleOp(inst.b), cond, labelOp(inst.d));
jumpOrFallthrough(blockOp(inst.e), next);
break;
}
case IrCmd::JUMP_CMP_ANY:
jumpOnAnyCmpFallback(regs, build, vmRegOp(inst.a), vmRegOp(inst.b), conditionOp(inst.c), labelOp(inst.d));
jumpOrFallthrough(blockOp(inst.e), next);
break;
case IrCmd::TABLE_LEN:
{
IrCallWrapperX64 callWrap(regs, build, index);
callWrap.addArgument(SizeX64::qword, regOp(inst.a), inst.a);
callWrap.call(qword[rNativeContext + offsetof(NativeContext, luaH_getn)]);
inst.regX64 = regs.allocReg(SizeX64::xmmword, index);
build.vcvtsi2sd(inst.regX64, inst.regX64, eax);
break;
}
case IrCmd::STRING_LEN:
{
RegisterX64 ptr = regOp(inst.a);
inst.regX64 = regs.allocReg(SizeX64::dword, index);
build.mov(inst.regX64, dword[ptr + offsetof(TString, len)]);
break;
}
case IrCmd::NEW_TABLE:
{
IrCallWrapperX64 callWrap(regs, build, index);
callWrap.addArgument(SizeX64::qword, rState);
callWrap.addArgument(SizeX64::dword, int32_t(uintOp(inst.a)));
callWrap.addArgument(SizeX64::dword, int32_t(uintOp(inst.b)));
callWrap.call(qword[rNativeContext + offsetof(NativeContext, luaH_new)]);
inst.regX64 = regs.takeReg(rax, index);
break;
}
case IrCmd::DUP_TABLE:
{
IrCallWrapperX64 callWrap(regs, build, index);
callWrap.addArgument(SizeX64::qword, rState);
callWrap.addArgument(SizeX64::qword, regOp(inst.a), inst.a);
callWrap.call(qword[rNativeContext + offsetof(NativeContext, luaH_clone)]);
inst.regX64 = regs.takeReg(rax, index);
break;
}
case IrCmd::TRY_NUM_TO_INDEX:
{
inst.regX64 = regs.allocReg(SizeX64::dword, index);
ScopedRegX64 tmp{regs, SizeX64::xmmword};
convertNumberToIndexOrJump(build, tmp.reg, regOp(inst.a), inst.regX64, labelOp(inst.b));
break;
}
case IrCmd::TRY_CALL_FASTGETTM:
{
ScopedRegX64 tmp{regs, SizeX64::qword};
build.mov(tmp.reg, qword[regOp(inst.a) + offsetof(Table, metatable)]);
regs.freeLastUseReg(function.instOp(inst.a), index); // Release before the call if it's the last use
build.test(tmp.reg, tmp.reg);
build.jcc(ConditionX64::Zero, labelOp(inst.c)); // No metatable
build.test(byte[tmp.reg + offsetof(Table, tmcache)], 1 << intOp(inst.b));
build.jcc(ConditionX64::NotZero, labelOp(inst.c)); // No tag method
ScopedRegX64 tmp2{regs, SizeX64::qword};
build.mov(tmp2.reg, qword[rState + offsetof(lua_State, global)]);
{
ScopedSpills spillGuard(regs);
IrCallWrapperX64 callWrap(regs, build, index);
callWrap.addArgument(SizeX64::qword, tmp);
callWrap.addArgument(SizeX64::qword, intOp(inst.b));
callWrap.addArgument(SizeX64::qword, qword[tmp2.release() + offsetof(global_State, tmname) + intOp(inst.b) * sizeof(TString*)]);
callWrap.call(qword[rNativeContext + offsetof(NativeContext, luaT_gettm)]);
}
build.test(rax, rax);
build.jcc(ConditionX64::Zero, labelOp(inst.c)); // No tag method
inst.regX64 = regs.takeReg(rax, index);
break;
}
case IrCmd::INT_TO_NUM:
inst.regX64 = regs.allocReg(SizeX64::xmmword, index);
build.vcvtsi2sd(inst.regX64, inst.regX64, regOp(inst.a));
break;
case IrCmd::UINT_TO_NUM:
inst.regX64 = regs.allocReg(SizeX64::xmmword, index);
build.vcvtsi2sd(inst.regX64, inst.regX64, qwordReg(regOp(inst.a)));
break;
case IrCmd::NUM_TO_INT:
inst.regX64 = regs.allocReg(SizeX64::dword, index);
build.vcvttsd2si(inst.regX64, memRegDoubleOp(inst.a));
break;
case IrCmd::NUM_TO_UINT:
inst.regX64 = regs.allocReg(SizeX64::dword, index);
build.vcvttsd2si(qwordReg(inst.regX64), memRegDoubleOp(inst.a));
break;
case IrCmd::ADJUST_STACK_TO_REG:
{
ScopedRegX64 tmp{regs, SizeX64::qword};
if (inst.b.kind == IrOpKind::Constant)
{
build.lea(tmp.reg, addr[rBase + (vmRegOp(inst.a) + intOp(inst.b)) * sizeof(TValue)]);
build.mov(qword[rState + offsetof(lua_State, top)], tmp.reg);
}
else if (inst.b.kind == IrOpKind::Inst)
{
build.mov(dwordReg(tmp.reg), regOp(inst.b));
build.shl(tmp.reg, kTValueSizeLog2);
build.lea(tmp.reg, addr[rBase + tmp.reg + vmRegOp(inst.a) * sizeof(TValue)]);
build.mov(qword[rState + offsetof(lua_State, top)], tmp.reg);
}
else
{
LUAU_ASSERT(!"Unsupported instruction form");
}
break;
}
case IrCmd::ADJUST_STACK_TO_TOP:
{
ScopedRegX64 tmp{regs, SizeX64::qword};
build.mov(tmp.reg, qword[rState + offsetof(lua_State, ci)]);
build.mov(tmp.reg, qword[tmp.reg + offsetof(CallInfo, top)]);
build.mov(qword[rState + offsetof(lua_State, top)], tmp.reg);
break;
}
case IrCmd::FASTCALL:
{
OperandX64 arg2 = inst.d.kind != IrOpKind::Undef ? memRegDoubleOp(inst.d) : OperandX64{0};
emitBuiltin(regs, build, uintOp(inst.a), vmRegOp(inst.b), vmRegOp(inst.c), arg2, intOp(inst.e), intOp(inst.f));
break;
}
case IrCmd::INVOKE_FASTCALL:
{
unsigned bfid = uintOp(inst.a);
OperandX64 args = 0;
if (inst.d.kind == IrOpKind::VmReg)
args = luauRegAddress(vmRegOp(inst.d));
else if (inst.d.kind == IrOpKind::VmConst)
args = luauConstantAddress(vmConstOp(inst.d));
else
LUAU_ASSERT(inst.d.kind == IrOpKind::Undef);
int ra = vmRegOp(inst.b);
int arg = vmRegOp(inst.c);
int nparams = intOp(inst.e);
int nresults = intOp(inst.f);
IrCallWrapperX64 callWrap(regs, build, index);
callWrap.addArgument(SizeX64::qword, rState);
callWrap.addArgument(SizeX64::qword, luauRegAddress(ra));
callWrap.addArgument(SizeX64::qword, luauRegAddress(arg));
callWrap.addArgument(SizeX64::dword, nresults);
callWrap.addArgument(SizeX64::qword, args);
if (nparams == LUA_MULTRET)
{
RegisterX64 reg = callWrap.suggestNextArgumentRegister(SizeX64::qword);
ScopedRegX64 tmp{regs, SizeX64::qword};
// L->top - (ra + 1)
build.mov(reg, qword[rState + offsetof(lua_State, top)]);
build.lea(tmp.reg, addr[rBase + (ra + 1) * sizeof(TValue)]);
build.sub(reg, tmp.reg);
build.shr(reg, kTValueSizeLog2);
callWrap.addArgument(SizeX64::dword, dwordReg(reg));
}
else
{
callWrap.addArgument(SizeX64::dword, nparams);
}
ScopedRegX64 func{regs, SizeX64::qword};
build.mov(func.reg, qword[rNativeContext + offsetof(NativeContext, luauF_table) + bfid * sizeof(luau_FastFunction)]);
callWrap.call(func.release());
inst.regX64 = regs.takeReg(eax, index); // Result of a builtin call is returned in eax
break;
}
case IrCmd::CHECK_FASTCALL_RES:
{
RegisterX64 res = regOp(inst.a);
build.test(res, res); // test here will set SF=1 for a negative number and it always sets OF to 0
build.jcc(ConditionX64::Less, labelOp(inst.b)); // jl jumps if SF != OF
break;
}
case IrCmd::DO_ARITH:
if (inst.c.kind == IrOpKind::VmReg)
callArithHelper(regs, build, vmRegOp(inst.a), vmRegOp(inst.b), luauRegAddress(vmRegOp(inst.c)), TMS(intOp(inst.d)));
else
callArithHelper(regs, build, vmRegOp(inst.a), vmRegOp(inst.b), luauConstantAddress(vmConstOp(inst.c)), TMS(intOp(inst.d)));
break;
case IrCmd::DO_LEN:
callLengthHelper(regs, build, vmRegOp(inst.a), vmRegOp(inst.b));
break;
case IrCmd::GET_TABLE:
if (inst.c.kind == IrOpKind::VmReg)
{
callGetTable(regs, build, vmRegOp(inst.b), luauRegAddress(vmRegOp(inst.c)), vmRegOp(inst.a));
}
else if (inst.c.kind == IrOpKind::Constant)
{
TValue n = {};
setnvalue(&n, uintOp(inst.c));
callGetTable(regs, build, vmRegOp(inst.b), build.bytes(&n, sizeof(n)), vmRegOp(inst.a));
}
else
{
LUAU_ASSERT(!"Unsupported instruction form");
}
break;
case IrCmd::SET_TABLE:
if (inst.c.kind == IrOpKind::VmReg)
{
callSetTable(regs, build, vmRegOp(inst.b), luauRegAddress(vmRegOp(inst.c)), vmRegOp(inst.a));
}
else if (inst.c.kind == IrOpKind::Constant)
{
TValue n = {};
setnvalue(&n, uintOp(inst.c));
callSetTable(regs, build, vmRegOp(inst.b), build.bytes(&n, sizeof(n)), vmRegOp(inst.a));
}
else
{
LUAU_ASSERT(!"Unsupported instruction form");
}
break;
case IrCmd::GET_IMPORT:
{
ScopedRegX64 tmp1{regs, SizeX64::qword};
build.mov(tmp1.reg, sClosure);
IrCallWrapperX64 callWrap(regs, build, index);
callWrap.addArgument(SizeX64::qword, rState);
callWrap.addArgument(SizeX64::qword, qword[tmp1.release() + offsetof(Closure, env)]);
callWrap.addArgument(SizeX64::qword, rConstants);
callWrap.addArgument(SizeX64::qword, luauRegAddress(vmRegOp(inst.a)));
callWrap.addArgument(SizeX64::dword, uintOp(inst.b));
callWrap.addArgument(SizeX64::dword, 0);
callWrap.call(qword[rNativeContext + offsetof(NativeContext, luaV_getimport)]);
emitUpdateBase(build);
break;
}
case IrCmd::CONCAT:
{
IrCallWrapperX64 callWrap(regs, build, index);
callWrap.addArgument(SizeX64::qword, rState);
callWrap.addArgument(SizeX64::dword, int32_t(uintOp(inst.b)));
callWrap.addArgument(SizeX64::dword, int32_t(vmRegOp(inst.a) + uintOp(inst.b) - 1));
callWrap.call(qword[rNativeContext + offsetof(NativeContext, luaV_concat)]);
emitUpdateBase(build);
break;
}
case IrCmd::GET_UPVALUE:
{
ScopedRegX64 tmp1{regs, SizeX64::qword};
ScopedRegX64 tmp2{regs, SizeX64::xmmword};
build.mov(tmp1.reg, sClosure);
build.add(tmp1.reg, offsetof(Closure, l.uprefs) + sizeof(TValue) * vmUpvalueOp(inst.b));
// uprefs[] is either an actual value, or it points to UpVal object which has a pointer to value
Label skip;
build.cmp(dword[tmp1.reg + offsetof(TValue, tt)], LUA_TUPVAL);
build.jcc(ConditionX64::NotEqual, skip);
// UpVal.v points to the value (either on stack, or on heap inside each UpVal, but we can deref it unconditionally)
build.mov(tmp1.reg, qword[tmp1.reg + offsetof(TValue, value.gc)]);
build.mov(tmp1.reg, qword[tmp1.reg + offsetof(UpVal, v)]);
build.setLabel(skip);
build.vmovups(tmp2.reg, xmmword[tmp1.reg]);
build.vmovups(luauReg(vmRegOp(inst.a)), tmp2.reg);
break;
}
case IrCmd::SET_UPVALUE:
{
ScopedRegX64 tmp1{regs, SizeX64::qword};
ScopedRegX64 tmp2{regs, SizeX64::qword};
build.mov(tmp1.reg, sClosure);
build.mov(tmp2.reg, qword[tmp1.reg + offsetof(Closure, l.uprefs) + sizeof(TValue) * vmUpvalueOp(inst.a) + offsetof(TValue, value.gc)]);
build.mov(tmp1.reg, qword[tmp2.reg + offsetof(UpVal, v)]);
{
ScopedRegX64 tmp3{regs, SizeX64::xmmword};
build.vmovups(tmp3.reg, luauReg(vmRegOp(inst.b)));
build.vmovups(xmmword[tmp1.reg], tmp3.reg);
}
tmp1.free();
callBarrierObject(regs, build, tmp2.release(), {}, vmRegOp(inst.b), /* ratag */ -1);
break;
}
case IrCmd::PREPARE_FORN:
callPrepareForN(regs, build, vmRegOp(inst.a), vmRegOp(inst.b), vmRegOp(inst.c));
break;
case IrCmd::CHECK_TAG:
{
bool continueInVm = (inst.d.kind == IrOpKind::Constant && intOp(inst.d));
build.cmp(memRegTagOp(inst.a), tagOp(inst.b));
jumpOrAbortOnUndef(ConditionX64::NotEqual, ConditionX64::Equal, inst.c, continueInVm);
break;
}
case IrCmd::CHECK_READONLY:
build.cmp(byte[regOp(inst.a) + offsetof(Table, readonly)], 0);
jumpOrAbortOnUndef(ConditionX64::NotEqual, ConditionX64::Equal, inst.b);
break;
case IrCmd::CHECK_NO_METATABLE:
build.cmp(qword[regOp(inst.a) + offsetof(Table, metatable)], 0);
jumpOrAbortOnUndef(ConditionX64::NotEqual, ConditionX64::Equal, inst.b);
break;
case IrCmd::CHECK_SAFE_ENV:
{
ScopedRegX64 tmp{regs, SizeX64::qword};
build.mov(tmp.reg, sClosure);
build.mov(tmp.reg, qword[tmp.reg + offsetof(Closure, env)]);
build.cmp(byte[tmp.reg + offsetof(Table, safeenv)], 0);
jumpOrAbortOnUndef(ConditionX64::Equal, ConditionX64::NotEqual, inst.a);
break;
}
case IrCmd::CHECK_ARRAY_SIZE:
if (inst.b.kind == IrOpKind::Inst)
build.cmp(dword[regOp(inst.a) + offsetof(Table, sizearray)], regOp(inst.b));
else if (inst.b.kind == IrOpKind::Constant)
build.cmp(dword[regOp(inst.a) + offsetof(Table, sizearray)], intOp(inst.b));
else
LUAU_ASSERT(!"Unsupported instruction form");
jumpOrAbortOnUndef(ConditionX64::BelowEqual, ConditionX64::NotBelowEqual, inst.c);
break;
case IrCmd::JUMP_SLOT_MATCH:
case IrCmd::CHECK_SLOT_MATCH:
{
Label abort; // Used when guard aborts execution
const IrOp& mismatchOp = inst.cmd == IrCmd::JUMP_SLOT_MATCH ? inst.d : inst.c;
Label& mismatch = mismatchOp.kind == IrOpKind::Undef ? abort : labelOp(mismatchOp);
ScopedRegX64 tmp{regs, SizeX64::qword};
// Check if node key tag is a string
build.mov(dwordReg(tmp.reg), luauNodeKeyTag(regOp(inst.a)));
build.and_(dwordReg(tmp.reg), kTKeyTagMask);
build.cmp(dwordReg(tmp.reg), LUA_TSTRING);
build.jcc(ConditionX64::NotEqual, mismatch);
// Check that node key value matches the expected one
build.mov(tmp.reg, luauConstantValue(vmConstOp(inst.b)));
build.cmp(tmp.reg, luauNodeKeyValue(regOp(inst.a)));
build.jcc(ConditionX64::NotEqual, mismatch);
// Check that node value is not nil
build.cmp(dword[regOp(inst.a) + offsetof(LuaNode, val) + offsetof(TValue, tt)], LUA_TNIL);
build.jcc(ConditionX64::Equal, mismatch);
if (inst.cmd == IrCmd::JUMP_SLOT_MATCH)
{
jumpOrFallthrough(blockOp(inst.c), next);
}
else if (mismatchOp.kind == IrOpKind::Undef)
{
Label skip;
build.jmp(skip);
build.setLabel(abort);
build.ud2();
build.setLabel(skip);
}
break;
}
case IrCmd::CHECK_NODE_NO_NEXT:
{
ScopedRegX64 tmp{regs, SizeX64::dword};
build.mov(tmp.reg, dword[regOp(inst.a) + offsetof(LuaNode, key) + kOffsetOfTKeyTagNext]);
build.shr(tmp.reg, kTKeyTagBits);
jumpOrAbortOnUndef(ConditionX64::NotZero, ConditionX64::Zero, inst.b);
break;
}
case IrCmd::INTERRUPT:
{
unsigned pcpos = uintOp(inst.a);
// We unconditionally spill values here because that allows us to ignore register state when we synthesize interrupt handler
// This can be changed in the future if we can somehow record interrupt handler code separately
// Since interrupts are loop edges or call/ret, we don't have a significant opportunity for register reuse here anyway
regs.preserveAndFreeInstValues();
ScopedRegX64 tmp{regs, SizeX64::qword};
Label self;
build.mov(tmp.reg, qword[rState + offsetof(lua_State, global)]);
build.cmp(qword[tmp.reg + offsetof(global_State, cb.interrupt)], 0);
build.jcc(ConditionX64::NotEqual, self);
Label next = build.setLabel();
interruptHandlers.push_back({self, pcpos, next});
break;
}
case IrCmd::CHECK_GC:
callStepGc(regs, build);
break;
case IrCmd::BARRIER_OBJ:
callBarrierObject(regs, build, regOp(inst.a), inst.a, vmRegOp(inst.b), inst.c.kind == IrOpKind::Undef ? -1 : tagOp(inst.c));
break;
case IrCmd::BARRIER_TABLE_BACK:
callBarrierTableFast(regs, build, regOp(inst.a), inst.a);
break;
case IrCmd::BARRIER_TABLE_FORWARD:
{
Label skip;
ScopedRegX64 tmp{regs, SizeX64::qword};
checkObjectBarrierConditions(build, tmp.reg, regOp(inst.a), vmRegOp(inst.b), inst.c.kind == IrOpKind::Undef ? -1 : tagOp(inst.c), skip);
{
ScopedSpills spillGuard(regs);
IrCallWrapperX64 callWrap(regs, build, index);
callWrap.addArgument(SizeX64::qword, rState);
callWrap.addArgument(SizeX64::qword, regOp(inst.a), inst.a);
callWrap.addArgument(SizeX64::qword, tmp);
callWrap.call(qword[rNativeContext + offsetof(NativeContext, luaC_barriertable)]);
}
build.setLabel(skip);
break;
}
case IrCmd::SET_SAVEDPC:
{
ScopedRegX64 tmp1{regs, SizeX64::qword};
ScopedRegX64 tmp2{regs, SizeX64::qword};
build.mov(tmp2.reg, sCode);
build.add(tmp2.reg, uintOp(inst.a) * sizeof(Instruction));
build.mov(tmp1.reg, qword[rState + offsetof(lua_State, ci)]);
build.mov(qword[tmp1.reg + offsetof(CallInfo, savedpc)], tmp2.reg);
break;
}
case IrCmd::CLOSE_UPVALS:
{
Label next;
ScopedRegX64 tmp1{regs, SizeX64::qword};
ScopedRegX64 tmp2{regs, SizeX64::qword};
// L->openupval != 0
build.mov(tmp1.reg, qword[rState + offsetof(lua_State, openupval)]);
build.test(tmp1.reg, tmp1.reg);
build.jcc(ConditionX64::Zero, next);
// ra <= L->openuval->v
build.lea(tmp2.reg, addr[rBase + vmRegOp(inst.a) * sizeof(TValue)]);
build.cmp(tmp2.reg, qword[tmp1.reg + offsetof(UpVal, v)]);
build.jcc(ConditionX64::Above, next);
tmp1.free();
{
ScopedSpills spillGuard(regs);
IrCallWrapperX64 callWrap(regs, build, index);
callWrap.addArgument(SizeX64::qword, rState);
callWrap.addArgument(SizeX64::qword, tmp2);
callWrap.call(qword[rNativeContext + offsetof(NativeContext, luaF_close)]);
}
build.setLabel(next);
break;
}
case IrCmd::CAPTURE:
// No-op right now
break;
// Fallbacks to non-IR instruction implementations
case IrCmd::SETLIST:
regs.assertAllFree();
emitInstSetList(regs, build, vmRegOp(inst.b), vmRegOp(inst.c), intOp(inst.d), uintOp(inst.e));
break;
case IrCmd::CALL:
regs.assertAllFree();
regs.assertNoSpills();
emitInstCall(build, helpers, vmRegOp(inst.a), intOp(inst.b), intOp(inst.c));
break;
case IrCmd::RETURN:
regs.assertAllFree();
regs.assertNoSpills();
emitInstReturn(build, helpers, vmRegOp(inst.a), intOp(inst.b), function.variadic);
break;
case IrCmd::FORGLOOP:
regs.assertAllFree();
emitInstForGLoop(build, vmRegOp(inst.a), intOp(inst.b), labelOp(inst.c));
jumpOrFallthrough(blockOp(inst.d), next);
break;
case IrCmd::FORGLOOP_FALLBACK:
{
IrCallWrapperX64 callWrap(regs, build, index);
callWrap.addArgument(SizeX64::qword, rState);
callWrap.addArgument(SizeX64::dword, vmRegOp(inst.a));
callWrap.addArgument(SizeX64::dword, intOp(inst.b));
callWrap.call(qword[rNativeContext + offsetof(NativeContext, forgLoopNonTableFallback)]);
emitUpdateBase(build);
build.test(al, al);
build.jcc(ConditionX64::NotZero, labelOp(inst.c));
jumpOrFallthrough(blockOp(inst.d), next);
break;
}
case IrCmd::FORGPREP_XNEXT_FALLBACK:
{
IrCallWrapperX64 callWrap(regs, build, index);
callWrap.addArgument(SizeX64::qword, rState);
callWrap.addArgument(SizeX64::qword, luauRegAddress(vmRegOp(inst.b)));
callWrap.addArgument(SizeX64::dword, uintOp(inst.a) + 1);
callWrap.call(qword[rNativeContext + offsetof(NativeContext, forgPrepXnextFallback)]);
jumpOrFallthrough(blockOp(inst.c), next);
break;
}
case IrCmd::COVERAGE:
{
ScopedRegX64 tmp1{regs, SizeX64::qword};
ScopedRegX64 tmp2{regs, SizeX64::dword};
ScopedRegX64 tmp3{regs, SizeX64::dword};
build.mov(tmp1.reg, sCode);
build.add(tmp1.reg, uintOp(inst.a) * sizeof(Instruction));
// hits = LUAU_INSN_E(*pc)
build.mov(tmp2.reg, dword[tmp1.reg]);
build.sar(tmp2.reg, 8);
// hits = (hits < (1 << 23) - 1) ? hits + 1 : hits;
build.xor_(tmp3.reg, tmp3.reg);
build.cmp(tmp2.reg, (1 << 23) - 1);
build.setcc(ConditionX64::NotEqual, byteReg(tmp3.reg));
build.add(tmp2.reg, tmp3.reg);
// VM_PATCH_E(pc, hits);
build.sal(tmp2.reg, 8);
build.movzx(tmp3.reg, byte[tmp1.reg]);
build.or_(tmp3.reg, tmp2.reg);
build.mov(dword[tmp1.reg], tmp3.reg);
break;
}
// Full instruction fallbacks
case IrCmd::FALLBACK_GETGLOBAL:
LUAU_ASSERT(inst.b.kind == IrOpKind::VmReg);
LUAU_ASSERT(inst.c.kind == IrOpKind::VmConst);
emitFallback(regs, build, offsetof(NativeContext, executeGETGLOBAL), uintOp(inst.a));
break;
case IrCmd::FALLBACK_SETGLOBAL:
LUAU_ASSERT(inst.b.kind == IrOpKind::VmReg);
LUAU_ASSERT(inst.c.kind == IrOpKind::VmConst);
emitFallback(regs, build, offsetof(NativeContext, executeSETGLOBAL), uintOp(inst.a));
break;
case IrCmd::FALLBACK_GETTABLEKS:
LUAU_ASSERT(inst.b.kind == IrOpKind::VmReg);
LUAU_ASSERT(inst.c.kind == IrOpKind::VmReg);
LUAU_ASSERT(inst.d.kind == IrOpKind::VmConst);
emitFallback(regs, build, offsetof(NativeContext, executeGETTABLEKS), uintOp(inst.a));
break;
case IrCmd::FALLBACK_SETTABLEKS:
LUAU_ASSERT(inst.b.kind == IrOpKind::VmReg);
LUAU_ASSERT(inst.c.kind == IrOpKind::VmReg);
LUAU_ASSERT(inst.d.kind == IrOpKind::VmConst);
emitFallback(regs, build, offsetof(NativeContext, executeSETTABLEKS), uintOp(inst.a));
break;
case IrCmd::FALLBACK_NAMECALL:
LUAU_ASSERT(inst.b.kind == IrOpKind::VmReg);
LUAU_ASSERT(inst.c.kind == IrOpKind::VmReg);
LUAU_ASSERT(inst.d.kind == IrOpKind::VmConst);
emitFallback(regs, build, offsetof(NativeContext, executeNAMECALL), uintOp(inst.a));
break;
case IrCmd::FALLBACK_PREPVARARGS:
LUAU_ASSERT(inst.b.kind == IrOpKind::Constant);
emitFallback(regs, build, offsetof(NativeContext, executePREPVARARGS), uintOp(inst.a));
break;
case IrCmd::FALLBACK_GETVARARGS:
LUAU_ASSERT(inst.b.kind == IrOpKind::VmReg);
LUAU_ASSERT(inst.c.kind == IrOpKind::Constant);
emitFallback(regs, build, offsetof(NativeContext, executeGETVARARGS), uintOp(inst.a));
break;
case IrCmd::FALLBACK_NEWCLOSURE:
LUAU_ASSERT(inst.b.kind == IrOpKind::VmReg);
LUAU_ASSERT(inst.c.kind == IrOpKind::Constant);
emitFallback(regs, build, offsetof(NativeContext, executeNEWCLOSURE), uintOp(inst.a));
break;
case IrCmd::FALLBACK_DUPCLOSURE:
LUAU_ASSERT(inst.b.kind == IrOpKind::VmReg);
LUAU_ASSERT(inst.c.kind == IrOpKind::VmConst);
emitFallback(regs, build, offsetof(NativeContext, executeDUPCLOSURE), uintOp(inst.a));
break;
case IrCmd::FALLBACK_FORGPREP:
emitFallback(regs, build, offsetof(NativeContext, executeFORGPREP), uintOp(inst.a));
jumpOrFallthrough(blockOp(inst.c), next);
break;
case IrCmd::BITAND_UINT:
inst.regX64 = regs.allocRegOrReuse(SizeX64::dword, index, {inst.a});
if (inst.a.kind != IrOpKind::Inst || inst.regX64 != regOp(inst.a))
build.mov(inst.regX64, memRegUintOp(inst.a));
build.and_(inst.regX64, memRegUintOp(inst.b));
break;
case IrCmd::BITXOR_UINT:
inst.regX64 = regs.allocRegOrReuse(SizeX64::dword, index, {inst.a});
if (inst.a.kind != IrOpKind::Inst || inst.regX64 != regOp(inst.a))
build.mov(inst.regX64, memRegUintOp(inst.a));
build.xor_(inst.regX64, memRegUintOp(inst.b));
break;
case IrCmd::BITOR_UINT:
inst.regX64 = regs.allocRegOrReuse(SizeX64::dword, index, {inst.a});
if (inst.a.kind != IrOpKind::Inst || inst.regX64 != regOp(inst.a))
build.mov(inst.regX64, memRegUintOp(inst.a));
build.or_(inst.regX64, memRegUintOp(inst.b));
break;
case IrCmd::BITNOT_UINT:
inst.regX64 = regs.allocRegOrReuse(SizeX64::dword, index, {inst.a});
if (inst.a.kind != IrOpKind::Inst || inst.regX64 != regOp(inst.a))
build.mov(inst.regX64, memRegUintOp(inst.a));
build.not_(inst.regX64);
break;
case IrCmd::BITLSHIFT_UINT:
{
// Custom bit shift value can only be placed in cl
ScopedRegX64 shiftTmp{regs, regs.takeReg(ecx, kInvalidInstIdx)};
inst.regX64 = regs.allocReg(SizeX64::dword, index);
build.mov(shiftTmp.reg, memRegUintOp(inst.b));
if (inst.a.kind != IrOpKind::Inst || inst.regX64 != regOp(inst.a))
build.mov(inst.regX64, memRegUintOp(inst.a));
build.shl(inst.regX64, byteReg(shiftTmp.reg));
break;
}
case IrCmd::BITRSHIFT_UINT:
{
// Custom bit shift value can only be placed in cl
ScopedRegX64 shiftTmp{regs, regs.takeReg(ecx, kInvalidInstIdx)};
inst.regX64 = regs.allocReg(SizeX64::dword, index);
build.mov(shiftTmp.reg, memRegUintOp(inst.b));
if (inst.a.kind != IrOpKind::Inst || inst.regX64 != regOp(inst.a))
build.mov(inst.regX64, memRegUintOp(inst.a));
build.shr(inst.regX64, byteReg(shiftTmp.reg));
break;
}
case IrCmd::BITARSHIFT_UINT:
{
// Custom bit shift value can only be placed in cl
ScopedRegX64 shiftTmp{regs, regs.takeReg(ecx, kInvalidInstIdx)};
inst.regX64 = regs.allocReg(SizeX64::dword, index);
build.mov(shiftTmp.reg, memRegUintOp(inst.b));
if (inst.a.kind != IrOpKind::Inst || inst.regX64 != regOp(inst.a))
build.mov(inst.regX64, memRegUintOp(inst.a));
build.sar(inst.regX64, byteReg(shiftTmp.reg));
break;
}
case IrCmd::BITLROTATE_UINT:
{
// Custom bit shift value can only be placed in cl
ScopedRegX64 shiftTmp{regs, regs.takeReg(ecx, kInvalidInstIdx)};
inst.regX64 = regs.allocReg(SizeX64::dword, index);
build.mov(shiftTmp.reg, memRegUintOp(inst.b));
if (inst.a.kind != IrOpKind::Inst || inst.regX64 != regOp(inst.a))
build.mov(inst.regX64, memRegUintOp(inst.a));
build.rol(inst.regX64, byteReg(shiftTmp.reg));
break;
}
case IrCmd::BITRROTATE_UINT:
{
// Custom bit shift value can only be placed in cl
ScopedRegX64 shiftTmp{regs, regs.takeReg(ecx, kInvalidInstIdx)};
inst.regX64 = regs.allocReg(SizeX64::dword, index);
build.mov(shiftTmp.reg, memRegUintOp(inst.b));
if (inst.a.kind != IrOpKind::Inst || inst.regX64 != regOp(inst.a))
build.mov(inst.regX64, memRegUintOp(inst.a));
build.ror(inst.regX64, byteReg(shiftTmp.reg));
break;
}
case IrCmd::BITCOUNTLZ_UINT:
{
inst.regX64 = regs.allocRegOrReuse(SizeX64::dword, index, {inst.a});
Label zero, exit;
build.test(regOp(inst.a), regOp(inst.a));
build.jcc(ConditionX64::Equal, zero);
build.bsr(inst.regX64, regOp(inst.a));
build.xor_(inst.regX64, 0x1f);
build.jmp(exit);
build.setLabel(zero);
build.mov(inst.regX64, 32);
build.setLabel(exit);
break;
}
case IrCmd::BITCOUNTRZ_UINT:
{
inst.regX64 = regs.allocRegOrReuse(SizeX64::dword, index, {inst.a});
Label zero, exit;
build.test(regOp(inst.a), regOp(inst.a));
build.jcc(ConditionX64::Equal, zero);
build.bsf(inst.regX64, regOp(inst.a));
build.jmp(exit);
build.setLabel(zero);
build.mov(inst.regX64, 32);
build.setLabel(exit);
break;
}
case IrCmd::INVOKE_LIBM:
{
IrCallWrapperX64 callWrap(regs, build, index);
callWrap.addArgument(SizeX64::xmmword, memRegDoubleOp(inst.b), inst.b);
if (inst.c.kind != IrOpKind::None)
{
bool isInt = (inst.c.kind == IrOpKind::Constant) ? constOp(inst.c).kind == IrConstKind::Int
: getCmdValueKind(function.instOp(inst.c).cmd) == IrValueKind::Int;
if (isInt)
callWrap.addArgument(SizeX64::dword, memRegUintOp(inst.c), inst.c);
else
callWrap.addArgument(SizeX64::xmmword, memRegDoubleOp(inst.c), inst.c);
}
callWrap.call(qword[rNativeContext + getNativeContextOffset(uintOp(inst.a))]);
inst.regX64 = regs.takeReg(xmm0, index);
break;
}
case IrCmd::GET_TYPE:
{
inst.regX64 = regs.allocReg(SizeX64::qword, index);
build.mov(inst.regX64, qword[rState + offsetof(lua_State, global)]);
if (inst.a.kind == IrOpKind::Inst)
build.mov(inst.regX64, qword[inst.regX64 + qwordReg(regOp(inst.a)) * sizeof(TString*) + offsetof(global_State, ttname)]);
else if (inst.a.kind == IrOpKind::Constant)
build.mov(inst.regX64, qword[inst.regX64 + tagOp(inst.a) * sizeof(TString*) + offsetof(global_State, ttname)]);
else
LUAU_ASSERT(!"Unsupported instruction form");
break;
}
case IrCmd::GET_TYPEOF:
{
IrCallWrapperX64 callWrap(regs, build);
callWrap.addArgument(SizeX64::qword, rState);
callWrap.addArgument(SizeX64::qword, luauRegAddress(vmRegOp(inst.a)));
callWrap.call(qword[rNativeContext + offsetof(NativeContext, luaT_objtypenamestr)]);
inst.regX64 = regs.takeReg(rax, index);
break;
}
// Pseudo instructions
case IrCmd::NOP:
case IrCmd::SUBSTITUTE:
LUAU_ASSERT(!"Pseudo instructions should not be lowered");
break;
}
valueTracker.afterInstLowering(inst, index);
regs.freeLastUseRegs(inst, index);
}
void IrLoweringX64::finishBlock()
{
regs.assertNoSpills();
}
void IrLoweringX64::finishFunction()
{
if (build.logText)
build.logAppend("; interrupt handlers\n");
for (InterruptHandler& handler : interruptHandlers)
{
build.setLabel(handler.self);
build.mov(eax, handler.pcpos + 1);
build.lea(rbx, handler.next);
build.jmp(helpers.interrupt);
}
if (build.logText)
build.logAppend("; exit handlers\n");
for (ExitHandler& handler : exitHandlers)
{
build.setLabel(handler.self);
build.mov(edx, handler.pcpos * sizeof(Instruction));
build.jmp(helpers.updatePcAndContinueInVm);
}
}
bool IrLoweringX64::hasError() const
{
// If register allocator had to use more stack slots than we have available, this function can't run natively
if (regs.maxUsedSlot > kSpillSlots)
return true;
return false;
}
bool IrLoweringX64::isFallthroughBlock(IrBlock target, IrBlock next)
{
return target.start == next.start;
}
void IrLoweringX64::jumpOrFallthrough(IrBlock& target, IrBlock& next)
{
if (!isFallthroughBlock(target, next))
build.jmp(target.label);
}
void IrLoweringX64::jumpOrAbortOnUndef(ConditionX64 cond, ConditionX64 condInverse, IrOp targetOrUndef, bool continueInVm)
{
if (targetOrUndef.kind == IrOpKind::Undef)
{
if (continueInVm)
{
build.jcc(cond, helpers.exitContinueVmClearNativeFlag);
return;
}
Label skip;
build.jcc(condInverse, skip);
build.ud2();
build.setLabel(skip);
}
else if (targetOrUndef.kind == IrOpKind::VmExit)
{
if (uint32_t* index = exitHandlerMap.find(targetOrUndef.index))
{
build.jcc(cond, exitHandlers[*index].self);
}
else
{
Label self;
build.jcc(cond, self);
exitHandlerMap[targetOrUndef.index] = uint32_t(exitHandlers.size());
exitHandlers.push_back({self, targetOrUndef.index});
}
}
else
{
build.jcc(cond, labelOp(targetOrUndef));
}
}
OperandX64 IrLoweringX64::memRegDoubleOp(IrOp op)
{
switch (op.kind)
{
case IrOpKind::Inst:
return regOp(op);
case IrOpKind::Constant:
return build.f64(doubleOp(op));
case IrOpKind::VmReg:
return luauRegValue(vmRegOp(op));
case IrOpKind::VmConst:
return luauConstantValue(vmConstOp(op));
default:
LUAU_ASSERT(!"Unsupported operand kind");
}
return noreg;
}
OperandX64 IrLoweringX64::memRegUintOp(IrOp op)
{
switch (op.kind)
{
case IrOpKind::Inst:
return regOp(op);
case IrOpKind::Constant:
return OperandX64(unsigned(intOp(op)));
default:
LUAU_ASSERT(!"Unsupported operand kind");
}
return noreg;
}
OperandX64 IrLoweringX64::memRegTagOp(IrOp op)
{
switch (op.kind)
{
case IrOpKind::Inst:
return regOp(op);
case IrOpKind::VmReg:
return luauRegTag(vmRegOp(op));
case IrOpKind::VmConst:
return luauConstantTag(vmConstOp(op));
default:
LUAU_ASSERT(!"Unsupported operand kind");
}
return noreg;
}
RegisterX64 IrLoweringX64::regOp(IrOp op)
{
IrInst& inst = function.instOp(op);
if (inst.spilled || inst.needsReload)
regs.restore(inst, false);
LUAU_ASSERT(inst.regX64 != noreg);
return inst.regX64;
}
IrConst IrLoweringX64::constOp(IrOp op) const
{
return function.constOp(op);
}
uint8_t IrLoweringX64::tagOp(IrOp op) const
{
return function.tagOp(op);
}
int IrLoweringX64::intOp(IrOp op) const
{
return function.intOp(op);
}
unsigned IrLoweringX64::uintOp(IrOp op) const
{
return function.uintOp(op);
}
double IrLoweringX64::doubleOp(IrOp op) const
{
return function.doubleOp(op);
}
IrBlock& IrLoweringX64::blockOp(IrOp op) const
{
return function.blockOp(op);
}
Label& IrLoweringX64::labelOp(IrOp op) const
{
return blockOp(op).label;
}
} // namespace X64
} // namespace CodeGen
} // namespace Luau
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