mirror of
https://github.com/danbulant/Cosmos
synced 2026-05-22 22:09:12 +00:00
61 lines
No EOL
2.7 KiB
C#
61 lines
No EOL
2.7 KiB
C#
using System;
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using CPUx86 = Cosmos.Assembler.x86;
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using Cosmos.Assembler;
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using Cosmos.IL2CPU.IL.CustomImplementations.System;
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namespace Cosmos.IL2CPU.X86.IL
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{
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[Cosmos.IL2CPU.OpCode( ILOpCode.Code.Ldelem_Ref )]
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public class Ldelem_Ref : ILOp
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{
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public Ldelem_Ref( Cosmos.Assembler.Assembler aAsmblr )
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: base( aAsmblr )
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{
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}
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public static void Assemble(Cosmos.Assembler.Assembler aAssembler, uint aElementSize,bool isSigned , bool debugEnabled)
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{
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DoNullReferenceCheck(aAssembler, debugEnabled, 4);
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if (aElementSize <= 0 || aElementSize > 8 || (aElementSize > 4 && aElementSize < 8))
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throw new Exception("Unsupported size for Ldelem_Ref: " + aElementSize);
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new CPUx86.Pop { DestinationReg = CPUx86.Registers.EAX };
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new CPUx86.Mov { DestinationReg = CPUx86.Registers.EDX, SourceValue = aElementSize };
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new CPUx86.Multiply { DestinationReg = CPUx86.Registers.EDX };
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//TODO: implement ObjectImpl first
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new CPUx86.Add { DestinationReg = CPUx86.Registers.EAX, SourceValue = ( ObjectImpl.FieldDataOffset + 4 ) };
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new CPUx86.Pop { DestinationReg = CPUx86.Registers.EDX };
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new CPUx86.Add { DestinationReg = CPUx86.Registers.EDX, SourceReg = CPUx86.Registers.EAX };
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switch (aElementSize)
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{
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case 1:
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if (isSigned)
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new CPUx86.MoveSignExtend { DestinationReg = CPUx86.Registers.ECX, Size = 8, SourceReg = CPUx86.Registers.EDX, SourceIsIndirect = true };
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else
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new CPUx86.MoveZeroExtend { DestinationReg = CPUx86.Registers.ECX, Size = 8, SourceReg = CPUx86.Registers.EDX, SourceIsIndirect = true };
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new CPUx86.Push { DestinationReg = CPUx86.Registers.ECX };
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break;
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case 2:
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if (isSigned)
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new CPUx86.MoveSignExtend { DestinationReg = CPUx86.Registers.ECX, Size = 16, SourceReg = CPUx86.Registers.EDX, SourceIsIndirect = true };
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else
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new CPUx86.MoveZeroExtend { DestinationReg = CPUx86.Registers.ECX, Size = 16, SourceReg = CPUx86.Registers.EDX, SourceIsIndirect = true };
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new CPUx86.Push { DestinationReg = CPUx86.Registers.ECX };
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break;
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case 4:
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new CPUx86.Push { DestinationReg = CPUx86.Registers.EDX, DestinationIsIndirect = true };
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break;
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case 8:
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new CPUx86.Push { DestinationReg = CPUx86.Registers.EDX, DestinationDisplacement = 4, DestinationIsIndirect = true };
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new CPUx86.Push { DestinationReg = CPUx86.Registers.EDX, DestinationIsIndirect = true };
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break;
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}
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}
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public override void Execute( MethodInfo aMethod, ILOpCode aOpCode )
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{
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Assemble( Assembler, 4, false, DebugEnabled);
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}
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}
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} |