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![Alex Barney](/assets/img/avatar_default.png)
* Fix typos * Remove unneeded using statements * Enforce var style more * Remove redundant qualifiers * Fix some indentation * Disable naming warnings on files with external enum names * Fix build * Mass find & replace for comments with no spacing * Standardize todo capitalization and for/if spacing
145 lines
4.6 KiB
C#
145 lines
4.6 KiB
C#
using ChocolArm64.IntermediateRepresentation;
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using ChocolArm64.State;
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using ChocolArm64.Translation;
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using System.Reflection;
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using System.Reflection.Emit;
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namespace ChocolArm64.Instructions
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{
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static class InstEmitFlowHelper
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{
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public static void EmitCall(ILEmitterCtx context, long imm)
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{
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if (context.Tier == TranslationTier.Tier0)
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{
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context.EmitStoreContext();
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context.TranslateAhead(imm);
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context.EmitLdc_I8(imm);
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context.Emit(OpCodes.Ret);
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return;
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}
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if (!context.TryOptEmitSubroutineCall())
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{
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context.HasSlowCall = true;
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context.EmitStoreContext();
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context.TranslateAhead(imm);
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context.EmitLdarg(TranslatedSub.StateArgIdx);
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context.EmitLdfld(typeof(CpuThreadState).GetField(nameof(CpuThreadState.CurrentTranslator),
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BindingFlags.Instance |
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BindingFlags.NonPublic));
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context.EmitLdarg(TranslatedSub.StateArgIdx);
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context.EmitLdc_I8(imm);
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context.EmitLdc_I4((int)CallType.Call);
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context.EmitPrivateCall(typeof(Translator), nameof(Translator.GetOrTranslateSubroutine));
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context.EmitLdarg(TranslatedSub.StateArgIdx);
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context.EmitLdarg(TranslatedSub.MemoryArgIdx);
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context.EmitCall(typeof(TranslatedSub), nameof(TranslatedSub.Execute));
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}
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EmitContinueOrReturnCheck(context);
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}
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public static void EmitVirtualCall(ILEmitterCtx context)
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{
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EmitVirtualCallOrJump(context, isJump: false);
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}
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public static void EmitVirtualJump(ILEmitterCtx context)
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{
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EmitVirtualCallOrJump(context, isJump: true);
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}
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private static void EmitVirtualCallOrJump(ILEmitterCtx context, bool isJump)
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{
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if (context.Tier == TranslationTier.Tier0)
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{
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context.Emit(OpCodes.Ret);
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}
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else
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{
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context.EmitSttmp();
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context.EmitLdarg(TranslatedSub.StateArgIdx);
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context.EmitLdfld(typeof(CpuThreadState).GetField(nameof(CpuThreadState.CurrentTranslator),
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BindingFlags.Instance |
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BindingFlags.NonPublic));
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context.EmitLdarg(TranslatedSub.StateArgIdx);
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context.EmitLdtmp();
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context.EmitLdc_I4(isJump
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? (int)CallType.VirtualJump
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: (int)CallType.VirtualCall);
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context.EmitPrivateCall(typeof(Translator), nameof(Translator.GetOrTranslateSubroutine));
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context.EmitLdarg(TranslatedSub.StateArgIdx);
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context.EmitLdarg(TranslatedSub.MemoryArgIdx);
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if (isJump)
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{
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// The tail prefix allows the JIT to jump to the next function,
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// while releasing the stack space used by the current one.
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// This is ideal for BR ARM instructions, which are
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// basically indirect tail calls.
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context.Emit(OpCodes.Tailcall);
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}
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MethodInfo mthdInfo = typeof(ArmSubroutine).GetMethod("Invoke");
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context.EmitCall(mthdInfo, isVirtual: true);
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if (!isJump)
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{
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EmitContinueOrReturnCheck(context);
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}
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else
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{
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context.Emit(OpCodes.Ret);
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}
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}
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}
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private static void EmitContinueOrReturnCheck(ILEmitterCtx context)
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{
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// Note: The return value of the called method will be placed
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// at the Stack, the return value is always a Int64 with the
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// return address of the function. We check if the address is
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// correct, if it isn't we keep returning until we reach the dispatcher.
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if (context.CurrBlock.Next != null)
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{
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context.Emit(OpCodes.Dup);
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context.EmitLdc_I8(context.CurrOp.Position + 4);
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ILLabel lblContinue = new ILLabel();
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context.Emit(OpCodes.Beq_S, lblContinue);
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context.Emit(OpCodes.Ret);
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context.MarkLabel(lblContinue);
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context.Emit(OpCodes.Pop);
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context.EmitLoadContext();
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}
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else
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{
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context.Emit(OpCodes.Ret);
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}
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}
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}
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}
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