protected virtual EXPR GenerateQuestionMarkOperand(EXPR pExpr)
{
Debug.Assert(pExpr != null);
// We must not optimize away compiler-generated reference casts because
// the expression tree API insists that the CType of both sides be identical.
if (pExpr.isCAST())
{
return GenerateConversion(pExpr.asCAST().GetArgument(), pExpr.type, pExpr.isChecked());
}
return Visit(pExpr);
}
// Return true if we actually report a failure.
protected bool TryReportLvalueFailure(EXPR expr, CheckLvalueKind kind)
{
Debug.Assert(expr != null);
// We have a lvalue failure. Was the reason because this field
// was marked readonly? Give special messages for this case.
bool isNested = false; // Did we recurse on a field or property to give a better error?
EXPR walk = expr;
while (true)
{
Debug.Assert(walk != null);
if (walk.isANYLOCAL_OK())
{
ReportLocalError(walk.asANYLOCAL().local, kind, isNested);
return(true);
}
EXPR pObject = null;
if (walk.isPROP())
{
// We've already reported read-only-property errors.
Debug.Assert(walk.asPROP().mwtSet != null);
pObject = walk.asPROP().GetMemberGroup().GetOptionalObject();
}
else if (walk.isFIELD())
{
EXPRFIELD field = walk.asFIELD();
if (field.fwt.Field().isReadOnly)
{
ReportReadOnlyError(field, kind, isNested);
return(true);
}
if (!field.fwt.Field().isStatic)
{
pObject = field.GetOptionalObject();
}
}
if (pObject != null && pObject.type.isStructOrEnum())
{
if (pObject.isCALL() || pObject.isPROP())
{
// assigning to RHS of method or property getter returning a value-type on the stack or
// passing RHS of method or property getter returning a value-type on the stack, as ref or out
ErrorContext.Error(ErrorCode.ERR_ReturnNotLValue, pObject.GetSymWithType());
return(true);
}
if (pObject.isCAST())
{
// An unboxing conversion.
//
// In the static compiler, we give the following error here:
// ErrorContext.Error(pObject.GetTree(), ErrorCode.ERR_UnboxNotLValue);
//
// But in the runtime, we allow this - mark that we're doing an
// unbox here, so that we gen the correct expression tree for it.
pObject.flags |= EXPRFLAG.EXF_UNBOXRUNTIME;
return(false);
}
}
// everything else
if (pObject != null && !pObject.isLvalue() && (walk.isFIELD() || (!isNested && walk.isPROP())))
{
Debug.Assert(pObject.type.isStructOrEnum());
walk = pObject;
}
else
{
ErrorContext.Error(GetStandardLvalueError(kind));
return(true);
}
isNested = true;
}
}
/////////////////////////////////////////////////////////////////////////////////
private object GetObject(EXPR pExpr)
{
if (pExpr.isCAST())
{
return GetObject(pExpr.asCAST().GetArgument());
}
else if (pExpr.isTYPEOF())
{
return pExpr.asTYPEOF().SourceType.type.AssociatedSystemType;
}
else if (pExpr.isMETHODINFO())
{
return GetMethodInfoFromExpr(pExpr.asMETHODINFO());
}
else if (pExpr.isCONSTANT())
{
CONSTVAL val = pExpr.asCONSTANT().Val;
CType underlyingType = pExpr.type;
object objval;
if (pExpr.type.IsNullType())
{
return null;
}
if (pExpr.type.isEnumType())
{
underlyingType = underlyingType.getAggregate().GetUnderlyingType();
}
switch (underlyingType.AssociatedSystemType.GetTypeCode())
{
case TypeCode.Boolean:
objval = val.boolVal;
break;
case TypeCode.SByte:
objval = val.sbyteVal;
break;
case TypeCode.Byte:
objval = val.byteVal;
break;
case TypeCode.Int16:
objval = val.shortVal;
break;
case TypeCode.UInt16:
objval = val.ushortVal;
break;
case TypeCode.Int32:
objval = val.iVal;
break;
case TypeCode.UInt32:
objval = val.uiVal;
break;
case TypeCode.Int64:
objval = val.longVal;
break;
case TypeCode.UInt64:
objval = val.ulongVal;
break;
case TypeCode.Single:
objval = val.floatVal;
break;
case TypeCode.Double:
objval = val.doubleVal;
break;
case TypeCode.Decimal:
objval = val.decVal;
break;
case TypeCode.Char:
objval = val.cVal;
break;
case TypeCode.String:
objval = val.strVal;
break;
default:
objval = val.objectVal;
break;
}
if (pExpr.type.isEnumType())
{
objval = Enum.ToObject(pExpr.type.AssociatedSystemType, objval);
}
return objval;
}
else if (pExpr.isZEROINIT())
{
if (pExpr.asZEROINIT().OptionalArgument != null)
{
return GetObject(pExpr.asZEROINIT().OptionalArgument);
}
return System.Activator.CreateInstance(pExpr.type.AssociatedSystemType);
}
Debug.Assert(false, "Invalid EXPR in GetObject");
throw Error.InternalCompilerError();
}
////////////////////////////////////////////////////////////////////////////////
// Bind the simple assignment operator =.
public EXPR bindAssignment(EXPR op1, EXPR op2, bool allowExplicit)
{
bool fOp2NotAddrOp = false;
bool fOp2WasCast = false;
if (!op1.isANYLOCAL_OK())
{
if (!checkLvalue(op1, CheckLvalueKind.Assignment))
{
EXPR rval = GetExprFactory().CreateAssignment(op1, op2);
rval.SetError();
return rval;
}
}
else
{
if (op2.type.IsArrayType())
{
return BindPtrToArray(op1.asANYLOCAL(), op2);
}
if (op2.type == GetReqPDT(PredefinedType.PT_STRING))
{
op2 = bindPtrToString(op2);
}
else if (op2.kind == ExpressionKind.EK_ADDR)
{
op2.flags |= EXPRFLAG.EXF_ADDRNOCONV;
}
else if (op2.isOK())
{
fOp2NotAddrOp = true;
fOp2WasCast = (op2.isCAST());
}
}
op2 = GenerateAssignmentConversion(op1, op2, allowExplicit);
if (op2.isOK() && fOp2NotAddrOp)
{
// Only report these errors if the convert succeeded
if (fOp2WasCast)
{
ErrorContext.Error(ErrorCode.ERR_BadCastInFixed);
}
else
{
ErrorContext.Error(ErrorCode.ERR_FixedNotNeeded);
}
}
return GenerateOptimizedAssignment(op1, op2);
}
/*
Handles enum unary operator (~).
*/
private EXPR BindEnumUnaOp(ExpressionKind ek, EXPRFLAG flags, EXPR arg)
{
Debug.Assert(ek == ExpressionKind.EK_BITNOT);
Debug.Assert(arg.isCAST());
Debug.Assert(arg.asCAST().GetArgument().type.isEnumType());
PredefinedType ptOp;
CType typeEnum = arg.asCAST().GetArgument().type;
switch (typeEnum.fundType())
{
default:
// Promote all smaller types to int.
ptOp = PredefinedType.PT_INT;
break;
case FUNDTYPE.FT_U4:
ptOp = PredefinedType.PT_UINT;
break;
case FUNDTYPE.FT_I8:
ptOp = PredefinedType.PT_LONG;
break;
case FUNDTYPE.FT_U8:
ptOp = PredefinedType.PT_ULONG;
break;
}
CType typeOp = GetReqPDT(ptOp);
arg = mustCast(arg, typeOp, CONVERTTYPE.NOUDC);
EXPR exprRes = BindIntOp(ek, flags, arg, null, ptOp);
if (!exprRes.isOK())
{
return exprRes;
}
return mustCastInUncheckedContext(exprRes, typeEnum, CONVERTTYPE.NOUDC);
}