mirror of
https://github.com/Ryujinx/Ryujinx.git
synced 2024-08-19 07:08:43 +02:00
f60033e0aa
* Implement block placement Implement a simple pass which re-orders cold blocks at the end of the list of blocks in the CFG. * Set PPTC version * Use Array.Resize Address gdkchan's feedback
622 lines
22 KiB
C#
622 lines
22 KiB
C#
using ARMeilleure.Decoders;
|
|
using ARMeilleure.IntermediateRepresentation;
|
|
using ARMeilleure.Translation;
|
|
using ARMeilleure.Translation.PTC;
|
|
using System;
|
|
using System.Reflection;
|
|
|
|
using static ARMeilleure.Instructions.InstEmitHelper;
|
|
using static ARMeilleure.IntermediateRepresentation.OperandHelper;
|
|
|
|
namespace ARMeilleure.Instructions
|
|
{
|
|
static class InstEmitMemoryHelper
|
|
{
|
|
private const int PageBits = 12;
|
|
private const int PageMask = (1 << PageBits) - 1;
|
|
|
|
private enum Extension
|
|
{
|
|
Zx,
|
|
Sx32,
|
|
Sx64
|
|
}
|
|
|
|
public static void EmitLoadZx(ArmEmitterContext context, Operand address, int rt, int size)
|
|
{
|
|
EmitLoad(context, address, Extension.Zx, rt, size);
|
|
}
|
|
|
|
public static void EmitLoadSx32(ArmEmitterContext context, Operand address, int rt, int size)
|
|
{
|
|
EmitLoad(context, address, Extension.Sx32, rt, size);
|
|
}
|
|
|
|
public static void EmitLoadSx64(ArmEmitterContext context, Operand address, int rt, int size)
|
|
{
|
|
EmitLoad(context, address, Extension.Sx64, rt, size);
|
|
}
|
|
|
|
private static void EmitLoad(ArmEmitterContext context, Operand address, Extension ext, int rt, int size)
|
|
{
|
|
bool isSimd = IsSimd(context);
|
|
|
|
if ((uint)size > (isSimd ? 4 : 3))
|
|
{
|
|
throw new ArgumentOutOfRangeException(nameof(size));
|
|
}
|
|
|
|
if (isSimd)
|
|
{
|
|
EmitReadVector(context, address, context.VectorZero(), rt, 0, size);
|
|
}
|
|
else
|
|
{
|
|
EmitReadInt(context, address, rt, size);
|
|
}
|
|
|
|
if (!isSimd && !(context.CurrOp is OpCode32 && rt == State.RegisterAlias.Aarch32Pc))
|
|
{
|
|
Operand value = GetInt(context, rt);
|
|
|
|
if (ext == Extension.Sx32 || ext == Extension.Sx64)
|
|
{
|
|
OperandType destType = ext == Extension.Sx64 ? OperandType.I64 : OperandType.I32;
|
|
|
|
switch (size)
|
|
{
|
|
case 0: value = context.SignExtend8 (destType, value); break;
|
|
case 1: value = context.SignExtend16(destType, value); break;
|
|
case 2: value = context.SignExtend32(destType, value); break;
|
|
}
|
|
}
|
|
|
|
SetInt(context, rt, value);
|
|
}
|
|
}
|
|
|
|
public static void EmitLoadSimd(
|
|
ArmEmitterContext context,
|
|
Operand address,
|
|
Operand vector,
|
|
int rt,
|
|
int elem,
|
|
int size)
|
|
{
|
|
EmitReadVector(context, address, vector, rt, elem, size);
|
|
}
|
|
|
|
public static void EmitStore(ArmEmitterContext context, Operand address, int rt, int size)
|
|
{
|
|
bool isSimd = IsSimd(context);
|
|
|
|
if ((uint)size > (isSimd ? 4 : 3))
|
|
{
|
|
throw new ArgumentOutOfRangeException(nameof(size));
|
|
}
|
|
|
|
if (isSimd)
|
|
{
|
|
EmitWriteVector(context, address, rt, 0, size);
|
|
}
|
|
else
|
|
{
|
|
EmitWriteInt(context, address, rt, size);
|
|
}
|
|
}
|
|
|
|
public static void EmitStoreSimd(
|
|
ArmEmitterContext context,
|
|
Operand address,
|
|
int rt,
|
|
int elem,
|
|
int size)
|
|
{
|
|
EmitWriteVector(context, address, rt, elem, size);
|
|
}
|
|
|
|
private static bool IsSimd(ArmEmitterContext context)
|
|
{
|
|
return context.CurrOp is IOpCodeSimd &&
|
|
!(context.CurrOp is OpCodeSimdMemMs ||
|
|
context.CurrOp is OpCodeSimdMemSs);
|
|
}
|
|
|
|
private static void EmitReadInt(ArmEmitterContext context, Operand address, int rt, int size)
|
|
{
|
|
Operand lblSlowPath = Label();
|
|
Operand lblEnd = Label();
|
|
|
|
Operand isUnalignedAddr = EmitAddressCheck(context, address, size);
|
|
|
|
context.BranchIfTrue(lblSlowPath, isUnalignedAddr);
|
|
|
|
Operand physAddr = EmitPtPointerLoad(context, address, lblSlowPath, write: false);
|
|
|
|
Operand value = null;
|
|
|
|
switch (size)
|
|
{
|
|
case 0: value = context.Load8 (physAddr); break;
|
|
case 1: value = context.Load16(physAddr); break;
|
|
case 2: value = context.Load (OperandType.I32, physAddr); break;
|
|
case 3: value = context.Load (OperandType.I64, physAddr); break;
|
|
}
|
|
|
|
SetInt(context, rt, value);
|
|
|
|
context.Branch(lblEnd);
|
|
|
|
context.MarkLabel(lblSlowPath, BasicBlockFrequency.Cold);
|
|
|
|
EmitReadIntFallback(context, address, rt, size);
|
|
|
|
context.MarkLabel(lblEnd);
|
|
}
|
|
|
|
public static Operand EmitReadIntAligned(ArmEmitterContext context, Operand address, int size)
|
|
{
|
|
if ((uint)size > 4)
|
|
{
|
|
throw new ArgumentOutOfRangeException(nameof(size));
|
|
}
|
|
|
|
Operand isUnalignedAddr = EmitAddressCheck(context, address, size);
|
|
|
|
Operand lblFastPath = Label();
|
|
|
|
context.BranchIfFalse(lblFastPath, isUnalignedAddr, BasicBlockFrequency.Cold);
|
|
|
|
// The call is not expected to return (it should throw).
|
|
context.Call(typeof(NativeInterface).GetMethod(nameof(NativeInterface.ThrowInvalidMemoryAccess)), address);
|
|
|
|
context.MarkLabel(lblFastPath);
|
|
|
|
Operand physAddr = EmitPtPointerLoad(context, address, null, write: false);
|
|
|
|
return size switch
|
|
{
|
|
0 => context.Load8(physAddr),
|
|
1 => context.Load16(physAddr),
|
|
2 => context.Load(OperandType.I32, physAddr),
|
|
3 => context.Load(OperandType.I64, physAddr),
|
|
_ => context.Load(OperandType.V128, physAddr)
|
|
};
|
|
}
|
|
|
|
private static void EmitReadVector(
|
|
ArmEmitterContext context,
|
|
Operand address,
|
|
Operand vector,
|
|
int rt,
|
|
int elem,
|
|
int size)
|
|
{
|
|
Operand lblSlowPath = Label();
|
|
Operand lblEnd = Label();
|
|
|
|
Operand isUnalignedAddr = EmitAddressCheck(context, address, size);
|
|
|
|
context.BranchIfTrue(lblSlowPath, isUnalignedAddr);
|
|
|
|
Operand physAddr = EmitPtPointerLoad(context, address, lblSlowPath, write: false);
|
|
|
|
Operand value = null;
|
|
|
|
switch (size)
|
|
{
|
|
case 0: value = context.VectorInsert8 (vector, context.Load8(physAddr), elem); break;
|
|
case 1: value = context.VectorInsert16(vector, context.Load16(physAddr), elem); break;
|
|
case 2: value = context.VectorInsert (vector, context.Load(OperandType.I32, physAddr), elem); break;
|
|
case 3: value = context.VectorInsert (vector, context.Load(OperandType.I64, physAddr), elem); break;
|
|
case 4: value = context.Load (OperandType.V128, physAddr); break;
|
|
}
|
|
|
|
context.Copy(GetVec(rt), value);
|
|
|
|
context.Branch(lblEnd);
|
|
|
|
context.MarkLabel(lblSlowPath, BasicBlockFrequency.Cold);
|
|
|
|
EmitReadVectorFallback(context, address, vector, rt, elem, size);
|
|
|
|
context.MarkLabel(lblEnd);
|
|
}
|
|
|
|
private static Operand VectorCreate(ArmEmitterContext context, Operand value)
|
|
{
|
|
return context.VectorInsert(context.VectorZero(), value, 0);
|
|
}
|
|
|
|
private static void EmitWriteInt(ArmEmitterContext context, Operand address, int rt, int size)
|
|
{
|
|
Operand lblSlowPath = Label();
|
|
Operand lblEnd = Label();
|
|
|
|
Operand isUnalignedAddr = EmitAddressCheck(context, address, size);
|
|
|
|
context.BranchIfTrue(lblSlowPath, isUnalignedAddr);
|
|
|
|
Operand physAddr = EmitPtPointerLoad(context, address, lblSlowPath, write: true);
|
|
|
|
Operand value = GetInt(context, rt);
|
|
|
|
if (size < 3 && value.Type == OperandType.I64)
|
|
{
|
|
value = context.ConvertI64ToI32(value);
|
|
}
|
|
|
|
switch (size)
|
|
{
|
|
case 0: context.Store8 (physAddr, value); break;
|
|
case 1: context.Store16(physAddr, value); break;
|
|
case 2: context.Store (physAddr, value); break;
|
|
case 3: context.Store (physAddr, value); break;
|
|
}
|
|
|
|
context.Branch(lblEnd);
|
|
|
|
context.MarkLabel(lblSlowPath, BasicBlockFrequency.Cold);
|
|
|
|
EmitWriteIntFallback(context, address, rt, size);
|
|
|
|
context.MarkLabel(lblEnd);
|
|
}
|
|
|
|
public static void EmitWriteIntAligned(ArmEmitterContext context, Operand address, Operand value, int size)
|
|
{
|
|
if ((uint)size > 4)
|
|
{
|
|
throw new ArgumentOutOfRangeException(nameof(size));
|
|
}
|
|
|
|
Operand isUnalignedAddr = EmitAddressCheck(context, address, size);
|
|
|
|
Operand lblFastPath = Label();
|
|
|
|
context.BranchIfFalse(lblFastPath, isUnalignedAddr, BasicBlockFrequency.Cold);
|
|
|
|
// The call is not expected to return (it should throw).
|
|
context.Call(typeof(NativeInterface).GetMethod(nameof(NativeInterface.ThrowInvalidMemoryAccess)), address);
|
|
|
|
context.MarkLabel(lblFastPath);
|
|
|
|
Operand physAddr = EmitPtPointerLoad(context, address, null, write: true);
|
|
|
|
if (size < 3 && value.Type == OperandType.I64)
|
|
{
|
|
value = context.ConvertI64ToI32(value);
|
|
}
|
|
|
|
if (size == 0)
|
|
{
|
|
context.Store8(physAddr, value);
|
|
}
|
|
else if (size == 1)
|
|
{
|
|
context.Store16(physAddr, value);
|
|
}
|
|
else
|
|
{
|
|
context.Store(physAddr, value);
|
|
}
|
|
}
|
|
|
|
private static void EmitWriteVector(
|
|
ArmEmitterContext context,
|
|
Operand address,
|
|
int rt,
|
|
int elem,
|
|
int size)
|
|
{
|
|
Operand lblSlowPath = Label();
|
|
Operand lblEnd = Label();
|
|
|
|
Operand isUnalignedAddr = EmitAddressCheck(context, address, size);
|
|
|
|
context.BranchIfTrue(lblSlowPath, isUnalignedAddr);
|
|
|
|
Operand physAddr = EmitPtPointerLoad(context, address, lblSlowPath, write: true);
|
|
|
|
Operand value = GetVec(rt);
|
|
|
|
switch (size)
|
|
{
|
|
case 0: context.Store8 (physAddr, context.VectorExtract8(value, elem)); break;
|
|
case 1: context.Store16(physAddr, context.VectorExtract16(value, elem)); break;
|
|
case 2: context.Store (physAddr, context.VectorExtract(OperandType.I32, value, elem)); break;
|
|
case 3: context.Store (physAddr, context.VectorExtract(OperandType.I64, value, elem)); break;
|
|
case 4: context.Store (physAddr, value); break;
|
|
}
|
|
|
|
context.Branch(lblEnd);
|
|
|
|
context.MarkLabel(lblSlowPath, BasicBlockFrequency.Cold);
|
|
|
|
EmitWriteVectorFallback(context, address, rt, elem, size);
|
|
|
|
context.MarkLabel(lblEnd);
|
|
}
|
|
|
|
public static Operand EmitAddressCheck(ArmEmitterContext context, Operand address, int size)
|
|
{
|
|
ulong addressCheckMask = ~((1UL << context.Memory.AddressSpaceBits) - 1);
|
|
|
|
addressCheckMask |= (1u << size) - 1;
|
|
|
|
return context.BitwiseAnd(address, Const(address.Type, (long)addressCheckMask));
|
|
}
|
|
|
|
public static Operand EmitPtPointerLoad(ArmEmitterContext context, Operand address, Operand lblSlowPath, bool write)
|
|
{
|
|
int ptLevelBits = context.Memory.AddressSpaceBits - 12; // 12 = Number of page bits.
|
|
int ptLevelSize = 1 << ptLevelBits;
|
|
int ptLevelMask = ptLevelSize - 1;
|
|
|
|
Operand pte = Ptc.State == PtcState.Disabled
|
|
? Const(context.Memory.PageTablePointer.ToInt64())
|
|
: Const(context.Memory.PageTablePointer.ToInt64(), true, Ptc.PageTablePointerIndex);
|
|
|
|
int bit = PageBits;
|
|
|
|
// Load page table entry from the page table.
|
|
// This was designed to support multi-level page tables of any size, however right
|
|
// now we only use flat page tables (so there's only one level).
|
|
// The page table entry contains the host address where the page is located.
|
|
// Additionally, the higher 16-bits of the host address may contain extra information
|
|
// used for write tracking, so this must be handled here aswell.
|
|
do
|
|
{
|
|
Operand addrPart = context.ShiftRightUI(address, Const(bit));
|
|
|
|
bit += ptLevelBits;
|
|
|
|
if (bit < context.Memory.AddressSpaceBits)
|
|
{
|
|
addrPart = context.BitwiseAnd(addrPart, Const(addrPart.Type, ptLevelMask));
|
|
}
|
|
|
|
Operand pteOffset = context.ShiftLeft(addrPart, Const(3));
|
|
|
|
if (pteOffset.Type == OperandType.I32)
|
|
{
|
|
pteOffset = context.ZeroExtend32(OperandType.I64, pteOffset);
|
|
}
|
|
|
|
Operand pteAddress = context.Add(pte, pteOffset);
|
|
|
|
pte = context.Load(OperandType.I64, pteAddress);
|
|
}
|
|
while (bit < context.Memory.AddressSpaceBits);
|
|
|
|
if (lblSlowPath != null)
|
|
{
|
|
context.BranchIf(lblSlowPath, pte, Const(0L), Comparison.LessOrEqual);
|
|
}
|
|
else
|
|
{
|
|
// When no label is provided to jump to a slow path if the address is invalid,
|
|
// we do the validation ourselves, and throw if needed.
|
|
if (write)
|
|
{
|
|
Operand lblNotWatched = Label();
|
|
|
|
// Is the page currently being monitored for modifications? If so we need to call MarkRegionAsModified.
|
|
context.BranchIf(lblNotWatched, pte, Const(0L), Comparison.GreaterOrEqual, BasicBlockFrequency.Cold);
|
|
|
|
// Mark the region as modified. Size here doesn't matter as address is assumed to be size aligned here.
|
|
context.Call(typeof(NativeInterface).GetMethod(nameof(NativeInterface.MarkRegionAsModified)), address, Const(1UL));
|
|
context.MarkLabel(lblNotWatched);
|
|
}
|
|
|
|
Operand lblNonNull = Label();
|
|
|
|
// Skip exception if the PTE address is non-null (not zero).
|
|
context.BranchIfTrue(lblNonNull, pte, BasicBlockFrequency.Cold);
|
|
|
|
// The call is not expected to return (it should throw).
|
|
context.Call(typeof(NativeInterface).GetMethod(nameof(NativeInterface.ThrowInvalidMemoryAccess)), address);
|
|
context.MarkLabel(lblNonNull);
|
|
|
|
pte = context.BitwiseAnd(pte, Const(0xffffffffffffUL));
|
|
}
|
|
|
|
Operand pageOffset = context.BitwiseAnd(address, Const(address.Type, PageMask));
|
|
|
|
if (pageOffset.Type == OperandType.I32)
|
|
{
|
|
pageOffset = context.ZeroExtend32(OperandType.I64, pageOffset);
|
|
}
|
|
|
|
return context.Add(pte, pageOffset);
|
|
}
|
|
|
|
private static void EmitReadIntFallback(ArmEmitterContext context, Operand address, int rt, int size)
|
|
{
|
|
MethodInfo info = null;
|
|
|
|
switch (size)
|
|
{
|
|
case 0: info = typeof(NativeInterface).GetMethod(nameof(NativeInterface.ReadByte)); break;
|
|
case 1: info = typeof(NativeInterface).GetMethod(nameof(NativeInterface.ReadUInt16)); break;
|
|
case 2: info = typeof(NativeInterface).GetMethod(nameof(NativeInterface.ReadUInt32)); break;
|
|
case 3: info = typeof(NativeInterface).GetMethod(nameof(NativeInterface.ReadUInt64)); break;
|
|
}
|
|
|
|
SetInt(context, rt, context.Call(info, address));
|
|
}
|
|
|
|
private static void EmitReadVectorFallback(
|
|
ArmEmitterContext context,
|
|
Operand address,
|
|
Operand vector,
|
|
int rt,
|
|
int elem,
|
|
int size)
|
|
{
|
|
MethodInfo info = null;
|
|
|
|
switch (size)
|
|
{
|
|
case 0: info = typeof(NativeInterface).GetMethod(nameof(NativeInterface.ReadByte)); break;
|
|
case 1: info = typeof(NativeInterface).GetMethod(nameof(NativeInterface.ReadUInt16)); break;
|
|
case 2: info = typeof(NativeInterface).GetMethod(nameof(NativeInterface.ReadUInt32)); break;
|
|
case 3: info = typeof(NativeInterface).GetMethod(nameof(NativeInterface.ReadUInt64)); break;
|
|
case 4: info = typeof(NativeInterface).GetMethod(nameof(NativeInterface.ReadVector128)); break;
|
|
}
|
|
|
|
Operand value = context.Call(info, address);
|
|
|
|
switch (size)
|
|
{
|
|
case 0: value = context.VectorInsert8 (vector, value, elem); break;
|
|
case 1: value = context.VectorInsert16(vector, value, elem); break;
|
|
case 2: value = context.VectorInsert (vector, value, elem); break;
|
|
case 3: value = context.VectorInsert (vector, value, elem); break;
|
|
}
|
|
|
|
context.Copy(GetVec(rt), value);
|
|
}
|
|
|
|
private static void EmitWriteIntFallback(ArmEmitterContext context, Operand address, int rt, int size)
|
|
{
|
|
MethodInfo info = null;
|
|
|
|
switch (size)
|
|
{
|
|
case 0: info = typeof(NativeInterface).GetMethod(nameof(NativeInterface.WriteByte)); break;
|
|
case 1: info = typeof(NativeInterface).GetMethod(nameof(NativeInterface.WriteUInt16)); break;
|
|
case 2: info = typeof(NativeInterface).GetMethod(nameof(NativeInterface.WriteUInt32)); break;
|
|
case 3: info = typeof(NativeInterface).GetMethod(nameof(NativeInterface.WriteUInt64)); break;
|
|
}
|
|
|
|
Operand value = GetInt(context, rt);
|
|
|
|
if (size < 3 && value.Type == OperandType.I64)
|
|
{
|
|
value = context.ConvertI64ToI32(value);
|
|
}
|
|
|
|
context.Call(info, address, value);
|
|
}
|
|
|
|
private static void EmitWriteVectorFallback(
|
|
ArmEmitterContext context,
|
|
Operand address,
|
|
int rt,
|
|
int elem,
|
|
int size)
|
|
{
|
|
MethodInfo info = null;
|
|
|
|
switch (size)
|
|
{
|
|
case 0: info = typeof(NativeInterface).GetMethod(nameof(NativeInterface.WriteByte)); break;
|
|
case 1: info = typeof(NativeInterface).GetMethod(nameof(NativeInterface.WriteUInt16)); break;
|
|
case 2: info = typeof(NativeInterface).GetMethod(nameof(NativeInterface.WriteUInt32)); break;
|
|
case 3: info = typeof(NativeInterface).GetMethod(nameof(NativeInterface.WriteUInt64)); break;
|
|
case 4: info = typeof(NativeInterface).GetMethod(nameof(NativeInterface.WriteVector128)); break;
|
|
}
|
|
|
|
Operand value = null;
|
|
|
|
if (size < 4)
|
|
{
|
|
switch (size)
|
|
{
|
|
case 0: value = context.VectorExtract8 (GetVec(rt), elem); break;
|
|
case 1: value = context.VectorExtract16(GetVec(rt), elem); break;
|
|
case 2: value = context.VectorExtract (OperandType.I32, GetVec(rt), elem); break;
|
|
case 3: value = context.VectorExtract (OperandType.I64, GetVec(rt), elem); break;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
value = GetVec(rt);
|
|
}
|
|
|
|
context.Call(info, address, value);
|
|
}
|
|
|
|
private static Operand GetInt(ArmEmitterContext context, int rt)
|
|
{
|
|
return context.CurrOp is OpCode32 ? GetIntA32(context, rt) : GetIntOrZR(context, rt);
|
|
}
|
|
|
|
private static void SetInt(ArmEmitterContext context, int rt, Operand value)
|
|
{
|
|
if (context.CurrOp is OpCode32)
|
|
{
|
|
SetIntA32(context, rt, value);
|
|
}
|
|
else
|
|
{
|
|
SetIntOrZR(context, rt, value);
|
|
}
|
|
}
|
|
|
|
// ARM32 helpers.
|
|
public static Operand GetMemM(ArmEmitterContext context, bool setCarry = true)
|
|
{
|
|
switch (context.CurrOp)
|
|
{
|
|
case OpCode32MemRsImm op: return GetMShiftedByImmediate(context, op, setCarry);
|
|
|
|
case OpCode32MemReg op: return GetIntA32(context, op.Rm);
|
|
|
|
case OpCode32Mem op: return Const(op.Immediate);
|
|
|
|
case OpCode32SimdMemImm op: return Const(op.Immediate);
|
|
|
|
default: throw InvalidOpCodeType(context.CurrOp);
|
|
}
|
|
}
|
|
|
|
private static Exception InvalidOpCodeType(OpCode opCode)
|
|
{
|
|
return new InvalidOperationException($"Invalid OpCode type \"{opCode?.GetType().Name ?? "null"}\".");
|
|
}
|
|
|
|
public static Operand GetMShiftedByImmediate(ArmEmitterContext context, OpCode32MemRsImm op, bool setCarry)
|
|
{
|
|
Operand m = GetIntA32(context, op.Rm);
|
|
|
|
int shift = op.Immediate;
|
|
|
|
if (shift == 0)
|
|
{
|
|
switch (op.ShiftType)
|
|
{
|
|
case ShiftType.Lsr: shift = 32; break;
|
|
case ShiftType.Asr: shift = 32; break;
|
|
case ShiftType.Ror: shift = 1; break;
|
|
}
|
|
}
|
|
|
|
if (shift != 0)
|
|
{
|
|
setCarry &= false;
|
|
|
|
switch (op.ShiftType)
|
|
{
|
|
case ShiftType.Lsl: m = InstEmitAluHelper.GetLslC(context, m, setCarry, shift); break;
|
|
case ShiftType.Lsr: m = InstEmitAluHelper.GetLsrC(context, m, setCarry, shift); break;
|
|
case ShiftType.Asr: m = InstEmitAluHelper.GetAsrC(context, m, setCarry, shift); break;
|
|
case ShiftType.Ror:
|
|
if (op.Immediate != 0)
|
|
{
|
|
m = InstEmitAluHelper.GetRorC(context, m, setCarry, shift);
|
|
}
|
|
else
|
|
{
|
|
m = InstEmitAluHelper.GetRrxC(context, m, setCarry);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
return m;
|
|
}
|
|
}
|
|
}
|