Ryujinx/ARMeilleure/Translation/ArmEmitterContext.cs
gdkchan f77694e4f7
Implement a new physical memory manager and replace DeviceMemory (#856)
* Implement a new physical memory manager and replace DeviceMemory

* Proper generic constraints

* Fix debug build

* Add memory tests

* New CPU memory manager and general code cleanup

* Remove host memory management from CPU project, use Ryujinx.Memory instead

* Fix tests

* Document exceptions on MemoryBlock

* Fix leak on unix memory allocation

* Proper disposal of some objects on tests

* Fix JitCache not being set as initialized

* GetRef without checks for 8-bits and 16-bits CAS

* Add MemoryBlock destructor

* Throw in separate method to improve codegen

* Address PR feedback

* QueryModified improvements

* Fix memory write tracking not marking all pages as modified in some cases

* Simplify MarkRegionAsModified

* Remove XML doc for ghost param

* Add back optimization to avoid useless buffer updates

* Add Ryujinx.Cpu project, move MemoryManager there and remove MemoryBlockWrapper

* Some nits

* Do not perform address translation when size is 0

* Address PR feedback and format NativeInterface class

* Remove ghost parameter description

* Update Ryujinx.Cpu to .NET Core 3.1

* Address PR feedback

* Fix build

* Return a well defined value for GetPhysicalAddress with invalid VA, and do not return unmapped ranges as modified

* Typo
2020-05-04 08:54:50 +10:00

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5.6 KiB
C#

using ARMeilleure.Decoders;
using ARMeilleure.Instructions;
using ARMeilleure.IntermediateRepresentation;
using ARMeilleure.Memory;
using ARMeilleure.State;
using System.Collections.Generic;
using static ARMeilleure.IntermediateRepresentation.OperandHelper;
namespace ARMeilleure.Translation
{
class ArmEmitterContext : EmitterContext
{
private Dictionary<ulong, Operand> _labels;
private OpCode _optOpLastCompare;
private OpCode _optOpLastFlagSet;
private Operand _optCmpTempN;
private Operand _optCmpTempM;
private Block _currBlock;
public Block CurrBlock
{
get
{
return _currBlock;
}
set
{
_currBlock = value;
ResetBlockState();
}
}
public OpCode CurrOp { get; set; }
public IMemoryManager Memory { get; }
public Aarch32Mode Mode { get; }
public JumpTable JumpTable { get; }
public long BaseAddress { get; }
public bool HighCq { get; }
public ArmEmitterContext(IMemoryManager memory, JumpTable jumpTable, long baseAddress, bool highCq, Aarch32Mode mode)
{
Memory = memory;
JumpTable = jumpTable;
BaseAddress = baseAddress;
HighCq = highCq;
Mode = mode;
_labels = new Dictionary<ulong, Operand>();
}
public Operand GetLabel(ulong address)
{
if (!_labels.TryGetValue(address, out Operand label))
{
label = Label();
_labels.Add(address, label);
}
return label;
}
public void MarkComparison(Operand n, Operand m)
{
_optOpLastCompare = CurrOp;
_optCmpTempN = Copy(n);
_optCmpTempM = Copy(m);
}
public void MarkFlagSet(PState stateFlag)
{
// Set this only if any of the NZCV flag bits were modified.
// This is used to ensure that when emiting a direct IL branch
// instruction for compare + branch sequences, we're not expecting
// to use comparison values from an old instruction, when in fact
// the flags were already overwritten by another instruction further along.
if (stateFlag >= PState.VFlag)
{
_optOpLastFlagSet = CurrOp;
}
}
private void ResetBlockState()
{
_optOpLastCompare = null;
_optOpLastFlagSet = null;
}
public Operand TryGetComparisonResult(Condition condition)
{
if (_optOpLastCompare == null || _optOpLastCompare != _optOpLastFlagSet)
{
return null;
}
Operand n = _optCmpTempN;
Operand m = _optCmpTempM;
InstName cmpName = _optOpLastCompare.Instruction.Name;
if (cmpName == InstName.Subs)
{
switch (condition)
{
case Condition.Eq: return ICompareEqual (n, m);
case Condition.Ne: return ICompareNotEqual (n, m);
case Condition.GeUn: return ICompareGreaterOrEqualUI(n, m);
case Condition.LtUn: return ICompareLessUI (n, m);
case Condition.GtUn: return ICompareGreaterUI (n, m);
case Condition.LeUn: return ICompareLessOrEqualUI (n, m);
case Condition.Ge: return ICompareGreaterOrEqual (n, m);
case Condition.Lt: return ICompareLess (n, m);
case Condition.Gt: return ICompareGreater (n, m);
case Condition.Le: return ICompareLessOrEqual (n, m);
}
}
else if (cmpName == InstName.Adds && _optOpLastCompare is IOpCodeAluImm op)
{
// There are several limitations that needs to be taken into account for CMN comparisons:
// - The unsigned comparisons are not valid, as they depend on the
// carry flag value, and they will have different values for addition and
// subtraction. For addition, it's carry, and for subtraction, it's borrow.
// So, we need to make sure we're not doing a unsigned compare for the CMN case.
// - We can only do the optimization for the immediate variants,
// because when the second operand value is exactly INT_MIN, we can't
// negate the value as theres no positive counterpart.
// Such invalid values can't be encoded on the immediate encodings.
if (op.RegisterSize == RegisterSize.Int32)
{
m = Const((int)-op.Immediate);
}
else
{
m = Const(-op.Immediate);
}
switch (condition)
{
case Condition.Eq: return ICompareEqual (n, m);
case Condition.Ne: return ICompareNotEqual (n, m);
case Condition.Ge: return ICompareGreaterOrEqual(n, m);
case Condition.Lt: return ICompareLess (n, m);
case Condition.Gt: return ICompareGreater (n, m);
case Condition.Le: return ICompareLessOrEqual (n, m);
}
}
return null;
}
}
}