private static int GetExceptionVariable(TranslationContext context, Block b)
{
if (b.Code == null)
{
return(-1);
}
int entryIndex = b.EntryIndex;
if (entryIndex < 0)
{
return(-1);
}
int exitIndex = b.ExitIndex;
int n = 0;
for (int i = entryIndex; i <= exitIndex; ++i)
{
var instr = context.Body.Code[i];
int pop = CIL.GetPopCount(context.Method, instr);
if (pop == 1 && n == 0)
{
switch (instr.Code)
{
case InstructionCode.Stloc:
case InstructionCode.Stloc_S:
return((int)instr.Value);
case InstructionCode.Stloc_0: return(0);
case InstructionCode.Stloc_1: return(1);
case InstructionCode.Stloc_2: return(2);
case InstructionCode.Stloc_3: return(3);
}
break;
}
n -= pop;
int push = CIL.GetPushCount(instr);
n += push;
}
return(-1);
}
/// <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();
}
}
