mirror of
https://github.com/danbulant/Cosmos
synced 2026-05-30 21:00:30 +00:00
90 lines
No EOL
3 KiB
C#
90 lines
No EOL
3 KiB
C#
using System;
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using System.IO;
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using Mono.Cecil;
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using Mono.Cecil.Cil;
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using CPU = Indy.IL2CPU.Assembler;
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using CPUx86 = Indy.IL2CPU.Assembler.X86;
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namespace Indy.IL2CPU.IL.X86 {
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[OpCode(Code.Stelem_Any, true)]
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public class Stelem_Any: Op {
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private int mElementSize;
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public Stelem_Any(Instruction aInstruction, MethodInformation aMethodInfo)
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: base(aInstruction, aMethodInfo) {
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TypeReference xType = aInstruction.Operand as TypeReference;
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if (xType == null)
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throw new Exception("Unable to determine Type!");
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mElementSize = Engine.GetFieldStorageSize(xType);
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if (mElementSize % 4 != 0) {
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throw new Exception("ElementSize should be divisible by 4");
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}
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}
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// todo: refactor other Stelem variants to use this method
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public static void Assemble(CPU.Assembler aAssembler, int aElementSize) {
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// stack - 3 == the array
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// stack - 2 == the index
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// stack - 1 == the new value
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int xStackSize = aElementSize;
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if(xStackSize % 4 != 0) {
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xStackSize += 4 - xStackSize % 4;
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}
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aAssembler.Add(new CPU.Comment("; Index at: [esp + " + xStackSize + "]"));
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aAssembler.Add(new CPU.Comment("; Array at: [esp + " + (xStackSize + 4) + "]"));
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aAssembler.Add(new CPUx86.Move("ebx", "[esp + " + xStackSize + "]")); // the index
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aAssembler.Add(new CPUx86.Move("ecx", "[esp + " + (xStackSize + 4) + "]")); // the array
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aAssembler.Add(new CPUx86.Add("ecx", "12"));
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Push(aAssembler, 4, "0x" + aElementSize.ToString("X"));
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Push(aAssembler, 4, "ebx");
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Multiply(aAssembler);
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Push(aAssembler, 4, "ecx");
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Add(aAssembler);
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aAssembler.Add(new CPUx86.Pop("ecx"));
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aAssembler.StackSizes.Pop();
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for (int i = (aElementSize / 4) - 1; i >= 0; i -= 1) {
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aAssembler.Add(new CPU.Comment("Start 1 dword"));
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aAssembler.Add(new CPUx86.Pop("ebx"));
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aAssembler.Add(new CPUx86.Move("[ecx]", "ebx"));
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aAssembler.Add(new CPUx86.Add("ecx", "4"));
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}
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switch (aElementSize % 4) {
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case 1: {
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aAssembler.Add(new CPU.Comment("Start 1 byte"));
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aAssembler.Add(new CPUx86.Pop("ebx"));
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Move(aAssembler, "byte [ecx]", "bl");
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break;
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}
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case 2: {
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aAssembler.Add(new CPU.Comment("Start 1 word"));
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aAssembler.Add(new CPUx86.Pop("ebx"));
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Move(aAssembler, "word [ecx]", "bx");
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break;
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}
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case 0: {
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break;
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}
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default:
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throw new Exception("Remainder size " + (aElementSize % 4) + " not supported!");
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}
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aAssembler.Add(new CPUx86.Add("esp", "0x8"));
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//
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// aAssembler.Add(new CPUx86.Move("[edx]", "ecx"));
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//
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// for (int i = 0; i < (aElementSize % 4); i++) {
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// aAssembler.Add(new CPUx86.Pushd("eax"));
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// if (i != 0) {
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// aAssembler.Add(new CPUx86.Add("eax", "4"));
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// aAssembler.Add(new CPUx86.Pushd("eax"));
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// }
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// }
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aAssembler.StackSizes.Pop();
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aAssembler.StackSizes.Pop();
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aAssembler.StackSizes.Pop();
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}
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public override void DoAssemble() {
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Assemble(Assembler, mElementSize);
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}
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}
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} |