public override void Execute(_MethodInfo aMethod, ILOpCode aOpCode)
{
var xEndLabel = GetLabel(aMethod, aOpCode) + ".End";
// size
XS.Pop(ECX);
// value
XS.Pop(EBX);
// address
XS.Pop(EDI);
XS.Compare(ECX, 0);
XS.Jump(ConditionalTestEnum.Equal, xEndLabel);
XS.Set(EDI, BL, destinationIsIndirect: true);
XS.Compare(ECX, 1);
XS.Jump(ConditionalTestEnum.Equal, xEndLabel);
XS.Set(ESI, EDI);
XS.Increment(EDI);
XS.Decrement(ECX);
new Movs {
Prefixes = InstructionPrefixes.Repeat, Size = 8
};
XS.Label(xEndLabel);
}
/* void Copy(
* Array sourceArray, ebp + 36
* int sourceIndex, ebp + 28
* Array destinationArray, ebp + 24
* int destinationIndex, ebp + 16
* int length, ebp + 12
* bool reliable); ebp + 8
*/
public override void AssembleNew(Assembler aAssembler, object aMethodInfo)
{
var xArrayCopyReverseLabel = "ArrayCopy_Reverse";
var xArrayCopyReverseLoopLabel = "ArrayCopy_Reverse_Loop";
var xArrayCopyEndLabel = "ArrayCopy_End";
XS.Comment("Source");
XS.Comment("Element size");
XS.Set(EAX, EBP, sourceDisplacement: SourceArrayDisplacement);
XS.Add(EAX, ObjectUtils.FieldDataOffset);
XS.Set(EAX, EAX, sourceIsIndirect: true); // element size
XS.Comment("Source ptr");
XS.Set(EBX, EBP, sourceDisplacement: SourceIndexDisplacement);
XS.Multiply(EBX);
XS.Add(EAX, ObjectUtils.FieldDataOffset + 4); // first element
XS.Set(ESI, EBP, sourceDisplacement: SourceArrayDisplacement);
XS.Add(ESI, EAX); // source ptr
XS.Comment("Destination");
XS.Comment("Element size");
XS.Set(EAX, EBP, sourceDisplacement: DestinationArrayDisplacement);
XS.Add(EAX, ObjectUtils.FieldDataOffset);
XS.Set(EAX, EAX, sourceIsIndirect: true); // element size
XS.Comment("Destination ptr");
XS.Set(ECX, EBP, sourceDisplacement: DestinationIndexDisplacement);
XS.Multiply(ECX);
XS.Add(EAX, ObjectUtils.FieldDataOffset + 4); // first element
XS.Set(EDI, EBP, sourceDisplacement: DestinationArrayDisplacement);
XS.Add(EDI, EAX); // destination ptr
XS.Compare(EDI, ESI);
XS.Jump(ConditionalTestEnum.Equal, xArrayCopyEndLabel);
XS.Comment("Copy byte count");
XS.Comment("Element size");
XS.Set(EAX, EBP, sourceDisplacement: DestinationArrayDisplacement);
XS.Add(EAX, ObjectUtils.FieldDataOffset);
XS.Set(EAX, EAX, sourceIsIndirect: true); // element size
XS.Comment("Count");
XS.Set(EDX, EBP, sourceDisplacement: LengthDisplacement);
// if length is 0, jump to end
XS.Compare(EDX, 0);
XS.Jump(ConditionalTestEnum.Equal, xArrayCopyEndLabel);
XS.Multiply(EDX);
XS.Set(ECX, EAX);
XS.Compare(EDI, ESI);
XS.Jump(ConditionalTestEnum.GreaterThan, xArrayCopyReverseLabel);
new Movs {
Size = 8, Prefixes = InstructionPrefixes.Repeat
};
XS.Jump(xArrayCopyEndLabel);
XS.Label(xArrayCopyReverseLabel);
XS.Add(ESI, ECX);
XS.Add(EDI, ECX);
XS.Label(xArrayCopyReverseLoopLabel);
XS.Decrement(ESI);
XS.Decrement(EDI);
XS.Decrement(ECX);
XS.Set(AL, ESI, sourceIsIndirect: true);
XS.Set(EDI, AL, destinationIsIndirect: true);
XS.Compare(ECX, 0);
XS.Jump(ConditionalTestEnum.NotEqual, xArrayCopyReverseLoopLabel);
XS.Label(xArrayCopyEndLabel);
}
