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using ChocolArm64.Decoder;
using ChocolArm64.State;
using ChocolArm64.Translation;
using System.Reflection.Emit;
namespace ChocolArm64.Instruction
{
static partial class AInstEmit
{
public static void B(AILEmitterCtx Context)
{
AOpCodeBImmAl Op = (AOpCodeBImmAl)Context.CurrOp;
if (Context.CurrBlock.Branch != null)
{
Context.Emit(OpCodes.Br, Context.GetLabel(Op.Imm));
}
else
{
Context.EmitStoreState();
Context.EmitLdc_I8(Op.Imm);
Context.Emit(OpCodes.Ret);
}
}
public static void B_Cond(AILEmitterCtx Context)
{
AOpCodeBImmCond Op = (AOpCodeBImmCond)Context.CurrOp;
EmitBranch(Context, Op.Cond);
}
public static void Bl(AILEmitterCtx Context)
{
AOpCodeBImmAl Op = (AOpCodeBImmAl)Context.CurrOp;
if (AOptimizations.GenerateCallStack)
{
Context.EmitLdarg(ATranslatedSub.StateArgIdx);
Context.EmitLdc_I8(Op.Imm);
Context.EmitPrivateCall(typeof(AThreadState), nameof(AThreadState.EnterMethod));
}
Context.EmitLdc_I(Op.Position + 4);
Context.EmitStint(AThreadState.LRIndex);
Context.EmitStoreState();
if (Context.TryOptEmitSubroutineCall())
{
//Note: the return value of the called method will be placed
//at the Stack, the return value is always a Int64 with the
//return address of the function. We check if the address is
//correct, if it isn't we keep returning until we reach the dispatcher.
Context.Emit(OpCodes.Dup);
Context.EmitLdc_I8(Op.Position + 4);
AILLabel LblContinue = new AILLabel();
Context.Emit(OpCodes.Beq_S, LblContinue);
Context.Emit(OpCodes.Ret);
Context.MarkLabel(LblContinue);
Context.Emit(OpCodes.Pop);
Context.EmitLoadState(Context.CurrBlock.Next);
}
else
{
Context.EmitLdc_I8(Op.Imm);
Context.Emit(OpCodes.Ret);
}
}
public static void Blr(AILEmitterCtx Context)
{
AOpCodeBReg Op = (AOpCodeBReg)Context.CurrOp;
if (AOptimizations.GenerateCallStack)
{
Context.EmitLdarg(ATranslatedSub.StateArgIdx);
Context.EmitLdintzr(Op.Rn);
Context.EmitPrivateCall(typeof(AThreadState), nameof(AThreadState.EnterMethod));
}
Context.EmitLdc_I(Op.Position + 4);
Context.EmitStint(AThreadState.LRIndex);
Context.EmitStoreState();
Context.EmitLdintzr(Op.Rn);
Context.Emit(OpCodes.Ret);
}
public static void Br(AILEmitterCtx Context)
{
AOpCodeBReg Op = (AOpCodeBReg)Context.CurrOp;
if (AOptimizations.GenerateCallStack)
{
Context.EmitLdarg(ATranslatedSub.StateArgIdx);
Context.EmitLdintzr(Op.Rn);
Context.EmitPrivateCall(typeof(AThreadState), nameof(AThreadState.JumpMethod));
}
Context.EmitStoreState();
Context.EmitLdintzr(Op.Rn);
Context.Emit(OpCodes.Ret);
}
public static void Cbnz(AILEmitterCtx Context) => EmitCb(Context, OpCodes.Bne_Un);
public static void Cbz(AILEmitterCtx Context) => EmitCb(Context, OpCodes.Beq);
private static void EmitCb(AILEmitterCtx Context, OpCode ILOp)
{
AOpCodeBImmCmp Op = (AOpCodeBImmCmp)Context.CurrOp;
Context.EmitLdintzr(Op.Rt);
Context.EmitLdc_I(0);
EmitBranch(Context, ILOp);
}
public static void Ret(AILEmitterCtx Context)
{
if (AOptimizations.GenerateCallStack)
{
Context.EmitLdarg(ATranslatedSub.StateArgIdx);
Context.EmitPrivateCall(typeof(AThreadState), nameof(AThreadState.ExitMethod));
}
Context.EmitStoreState();
Context.EmitLdint(AThreadState.LRIndex);
Context.Emit(OpCodes.Ret);
}
public static void Tbnz(AILEmitterCtx Context) => EmitTb(Context, OpCodes.Bne_Un);
public static void Tbz(AILEmitterCtx Context) => EmitTb(Context, OpCodes.Beq);
private static void EmitTb(AILEmitterCtx Context, OpCode ILOp)
{
AOpCodeBImmTest Op = (AOpCodeBImmTest)Context.CurrOp;
Context.EmitLdintzr(Op.Rt);
Context.EmitLdc_I(1L << Op.Pos);
Context.Emit(OpCodes.And);
Context.EmitLdc_I(0);
EmitBranch(Context, ILOp);
}
private static void EmitBranch(AILEmitterCtx Context, ACond Cond)
{
AOpCodeBImm Op = (AOpCodeBImm)Context.CurrOp;
if (Context.CurrBlock.Next != null &&
Context.CurrBlock.Branch != null)
{
Context.EmitCondBranch(Context.GetLabel(Op.Imm), Cond);
}
else
{
Context.EmitStoreState();
AILLabel LblTaken = new AILLabel();
Context.EmitCondBranch(LblTaken, Cond);
Context.EmitLdc_I8(Op.Position + 4);
Context.Emit(OpCodes.Ret);
Context.MarkLabel(LblTaken);
Context.EmitLdc_I8(Op.Imm);
Context.Emit(OpCodes.Ret);
}
}
private static void EmitBranch(AILEmitterCtx Context, OpCode ILOp)
{
AOpCodeBImm Op = (AOpCodeBImm)Context.CurrOp;
if (Context.CurrBlock.Next != null &&
Context.CurrBlock.Branch != null)
{
Context.Emit(ILOp, Context.GetLabel(Op.Imm));
}
else
{
Context.EmitStoreState();
AILLabel LblTaken = new AILLabel();
Context.Emit(ILOp, LblTaken);
Context.EmitLdc_I8(Op.Position + 4);
Context.Emit(OpCodes.Ret);
Context.MarkLabel(LblTaken);
Context.EmitLdc_I8(Op.Imm);
Context.Emit(OpCodes.Ret);
}
}
}
}
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