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using ChocolArm64.Decoders;
using ChocolArm64.State;
using ChocolArm64.Translation;
using System.Reflection.Emit;
using static ChocolArm64.Instructions.InstEmitFlowHelper;
namespace ChocolArm64.Instructions
{
static partial class InstEmit
{
public static void B(ILEmitterCtx context)
{
OpCodeBImmAl64 op = (OpCodeBImmAl64)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(ILEmitterCtx context)
{
OpCodeBImmCond64 op = (OpCodeBImmCond64)context.CurrOp;
EmitBranch(context, op.Cond);
}
public static void Bl(ILEmitterCtx context)
{
OpCodeBImmAl64 op = (OpCodeBImmAl64)context.CurrOp;
context.EmitLdc_I(op.Position + 4);
context.EmitStint(RegisterAlias.Lr);
EmitCall(context, op.Imm);
}
public static void Blr(ILEmitterCtx context)
{
OpCodeBReg64 op = (OpCodeBReg64)context.CurrOp;
context.EmitLdintzr(op.Rn);
context.EmitLdc_I(op.Position + 4);
context.EmitStint(RegisterAlias.Lr);
context.EmitStoreState();
EmitVirtualCall(context);
}
public static void Br(ILEmitterCtx context)
{
OpCodeBReg64 op = (OpCodeBReg64)context.CurrOp;
context.HasIndirectJump = true;
context.EmitStoreState();
context.EmitLdintzr(op.Rn);
EmitVirtualJump(context);
}
public static void Cbnz(ILEmitterCtx context) => EmitCb(context, OpCodes.Bne_Un);
public static void Cbz(ILEmitterCtx context) => EmitCb(context, OpCodes.Beq);
private static void EmitCb(ILEmitterCtx context, OpCode ilOp)
{
OpCodeBImmCmp64 op = (OpCodeBImmCmp64)context.CurrOp;
context.EmitLdintzr(op.Rt);
context.EmitLdc_I(0);
EmitBranch(context, ilOp);
}
public static void Ret(ILEmitterCtx context)
{
context.EmitStoreState();
context.EmitLdint(RegisterAlias.Lr);
context.Emit(OpCodes.Ret);
}
public static void Tbnz(ILEmitterCtx context) => EmitTb(context, OpCodes.Bne_Un);
public static void Tbz(ILEmitterCtx context) => EmitTb(context, OpCodes.Beq);
private static void EmitTb(ILEmitterCtx context, OpCode ilOp)
{
OpCodeBImmTest64 op = (OpCodeBImmTest64)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(ILEmitterCtx context, Condition cond)
{
OpCodeBImm64 op = (OpCodeBImm64)context.CurrOp;
if (context.CurrBlock.Branch != null)
{
context.EmitCondBranch(context.GetLabel(op.Imm), cond);
if (context.CurrBlock.Next == null)
{
context.EmitStoreState();
context.EmitLdc_I8(op.Position + 4);
context.Emit(OpCodes.Ret);
}
}
else
{
context.EmitStoreState();
ILLabel lblTaken = new ILLabel();
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(ILEmitterCtx context, OpCode ilOp)
{
OpCodeBImm64 op = (OpCodeBImm64)context.CurrOp;
if (context.CurrBlock.Branch != null)
{
context.Emit(ilOp, context.GetLabel(op.Imm));
if (context.CurrBlock.Next == null)
{
context.EmitStoreState();
context.EmitLdc_I8(op.Position + 4);
context.Emit(OpCodes.Ret);
}
}
else
{
context.EmitStoreState();
ILLabel lblTaken = new ILLabel();
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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