/// <summary>
/// Validates the instruction operands and creates a matching variable for the result.
/// </summary>
/// <param name="ctx">The context.</param>
/// <param name="compiler">The compiler.</param>
public override void Validate(Context ctx, IMethodCompiler compiler)
{
base.Validate(ctx, compiler);
StackTypeCode result = StackTypeCode.Unknown;
switch (_opcode)
{
case OpCode.Add:
result = _addTable[(int)ctx.Operand1.StackType][(int)ctx.Operand2.StackType];
break;
case OpCode.Sub:
result = _subTable[(int)ctx.Operand1.StackType][(int)ctx.Operand2.StackType];
break;
default:
result = _operandTable[(int)ctx.Operand1.StackType][(int)ctx.Operand2.StackType];
break;
}
if (StackTypeCode.Unknown == result)
{
throw new InvalidOperationException("Invalid operand types passed to " + _opcode);
}
SigType resultType;
if (result != StackTypeCode.Ptr)
{
resultType = Operand.SigTypeFromStackType(result);
}
else
{
// Copy the pointer element type
PtrSigType op0 = ctx.Operand1.Type as PtrSigType;
PtrSigType op1 = ctx.Operand2.Type as PtrSigType;
if (op0 != null)
{
resultType = new PtrSigType(op0.CustomMods, op0.ElementType);
}
else if (op1 != null)
{
resultType = new PtrSigType(op1.CustomMods, op1.ElementType);
}
else
{
throw new InvalidOperationException();
}
}
ctx.Result = compiler.CreateTemporary(resultType);
}
/// <summary>
/// Validates the instruction operands and creates a matching variable for the result.
/// </summary>
/// <param name="ctx">The context.</param>
/// <param name="compiler">The compiler.</param>
public override void Validate(Context ctx, IMethodCompiler compiler)
{
base.Validate(ctx, compiler);
// If we're ldind.i8, fix an IL deficiency that the result may be U8
if (opcode == OpCode.Ldind_i8 && this.typeRef.Type == CilElementType.I8)
{
SigType opType = ctx.Operand1.Type;
RefSigType rst = opType as RefSigType;
PtrSigType ptr = opType as PtrSigType;
if (rst != null && rst.ElementType.Type == CilElementType.U8 ||
ptr != null && ptr.ElementType.Type == CilElementType.U8)
{
ctx.Result = compiler.CreateTemporary(BuiltInSigType.UInt64);
}
}
}
