/// <summary>
/// Visitation function for <see cref="CIL.ICILVisitor.UnaryBranch"/>.
/// </summary>
/// <param name="ctx">The context.</param>
void CIL.ICILVisitor.UnaryBranch(Context ctx)
{
IBranch branch = ctx.Branch;
CIL.OpCode opcode = (ctx.Instruction as CIL.ICILInstruction).OpCode;
Operand op = ctx.Operand1;
ctx.SetInstruction(CPUx86.Instruction.CmpInstruction, ctx.Operand1, new ConstantOperand(new SigType(CilElementType.I4), 0));
if (opcode == CIL.OpCode.Brtrue || opcode == CIL.OpCode.Brtrue_s)
{
ctx.AppendInstruction(CPUx86.Instruction.BranchInstruction, IR.ConditionCode.Equal);
}
else
if (opcode == CIL.OpCode.Brfalse || opcode == CIL.OpCode.Brfalse_s)
{
ctx.AppendInstruction(CPUx86.Instruction.BranchInstruction, IR.ConditionCode.NotEqual);
}
else
{
throw new NotImplementedException();
}
ctx.SetBranch(branch.Targets[0]);
}
/// <summary>
/// Converts the specified opcode.
/// </summary>
/// <param name="opcode">The opcode.</param>
/// <returns></returns>
public static IR.ConditionCode ConvertCondition(CIL.OpCode opcode)
{
switch (opcode)
{
// Signed
case CIL.OpCode.Beq_s: return(IR.ConditionCode.Equal);
case CIL.OpCode.Bge_s: return(IR.ConditionCode.GreaterOrEqual);
case CIL.OpCode.Bgt_s: return(IR.ConditionCode.GreaterThan);
case CIL.OpCode.Ble_s: return(IR.ConditionCode.LessOrEqual);
case CIL.OpCode.Blt_s: return(IR.ConditionCode.LessThan);
// Unsigned
case CIL.OpCode.Bne_un_s: return(IR.ConditionCode.NotEqual);
case CIL.OpCode.Bge_un_s: return(IR.ConditionCode.UnsignedGreaterOrEqual);
case CIL.OpCode.Bgt_un_s: return(IR.ConditionCode.UnsignedGreaterThan);
case CIL.OpCode.Ble_un_s: return(IR.ConditionCode.UnsignedLessOrEqual);
case CIL.OpCode.Blt_un_s: return(IR.ConditionCode.UnsignedLessThan);
// Long form signed
case CIL.OpCode.Beq: goto case CIL.OpCode.Beq_s;
case CIL.OpCode.Bge: goto case CIL.OpCode.Bge_s;
case CIL.OpCode.Bgt: goto case CIL.OpCode.Bgt_s;
case CIL.OpCode.Ble: goto case CIL.OpCode.Ble_s;
case CIL.OpCode.Blt: goto case CIL.OpCode.Blt_s;
// Long form unsigned
case CIL.OpCode.Bne_un: goto case CIL.OpCode.Bne_un_s;
case CIL.OpCode.Bge_un: goto case CIL.OpCode.Bge_un_s;
case CIL.OpCode.Bgt_un: goto case CIL.OpCode.Bgt_un_s;
case CIL.OpCode.Ble_un: goto case CIL.OpCode.Ble_un_s;
case CIL.OpCode.Blt_un: goto case CIL.OpCode.Blt_un_s;
// Compare
case CIL.OpCode.Ceq: return(IR.ConditionCode.Equal);
case CIL.OpCode.Cgt: return(IR.ConditionCode.GreaterThan);
case CIL.OpCode.Cgt_un: return(IR.ConditionCode.UnsignedGreaterThan);
case CIL.OpCode.Clt: return(IR.ConditionCode.LessThan);
case CIL.OpCode.Clt_un: return(IR.ConditionCode.UnsignedLessThan);
default: throw new NotImplementedException();
}
}