static ConversionSymbol()
{
var conversions = (ConversionKind[])Enum.GetValues(typeof(ConversionKind));
simpleConv = new ConversionSymbol[conversions.Length];
foreach (var c in conversions)
{
simpleConv[(int)c] = new ConversionSymbol(c);
}
convCost = new int[conversions.Length];
#if DEBUG
foreach (var c in conversions)
{
convCost[(int)c] = -1;
}
#endif
convCost[(int)ConversionKind.NoConversion] = 0;
convCost[(int)ConversionKind.NoImplicitConversion] = 0;
convCost[(int)ConversionKind.Identity] = Implicit | 0;
convCost[(int)ConversionKind.ImplicitEnumeration] = Implicit | 1;
convCost[(int)ConversionKind.ImplicitNumeric] = Implicit | 1;
convCost[(int)ConversionKind.ImplicitNullable] = Implicit | 2;
//convCost[(int)ConversionKind.NullLiteral] = Implicit | 0;
convCost[(int)ConversionKind.ImplicitReference] = Implicit | 0;
convCost[(int)ConversionKind.Boxing] = Implicit | 3;
convCost[(int)ConversionKind.ImplicitUsual] = Implicit | 4;
convCost[(int)ConversionKind.ImplicitUserDefined] = Implicit | 4;
convCost[(int)ConversionKind.Refer] = Implicit | 0;
convCost[(int)ConversionKind.Deref] = Implicit | 0;
convCost[(int)ConversionKind.ConstantReduction] = Implicit | 0;
convCost[(int)ConversionKind.ExplicitEnumeration] = Explicit | 1;
convCost[(int)ConversionKind.ExplicitNumeric] = Explicit | 1;
convCost[(int)ConversionKind.ExplicitNullable] = Explicit | 2;
convCost[(int)ConversionKind.ExplicitReference] = Explicit | 0;
convCost[(int)ConversionKind.Unboxing] = Explicit | Cast | 3;
convCost[(int)ConversionKind.ExplicitUsual] = Explicit | 4;
convCost[(int)ConversionKind.ExplicitUserDefined] = Explicit | 4;
#if DEBUG
foreach (var cost in convCost)
{
Debug.Assert(cost >= 0);
}
#endif
}
internal static ConversionSymbol ResolveUsualConversion(Expr expr, TypeSymbol type, BindOptions options)
{
if (expr.Datatype.NativeType == NativeType.Usual)
{
if (type.NativeType == NativeType.Object)
{
if (options.HasFlag(BindOptions.BoxUsual))
{
return(ConversionSymbol.Create(ConversionKind.Boxing));
}
else
{
MethodSymbol converter = null;
ResolveConversionMethod(expr, type, Compilation.Get(NativeType.Usual).Lookup(XSharpFunctionNames.ToObject), ref converter, options);
if (converter != null)
{
return(ConversionSymbol.Create(ConversionKind.ImplicitUserDefined, converter));
}
}
}
else
{
MethodSymbol converter = null;
ResolveConversionMethod(expr, Compilation.Get(NativeType.Object), Compilation.Get(NativeType.Usual).Lookup(XSharpFunctionNames.ToObject), ref converter, options);
if (converter != null)
{
var inner = ConversionSymbol.Create(ConversionKind.ImplicitUserDefined, converter);
var outer = type.IsReferenceType ? ConversionSymbol.Create(ConversionKind.ExplicitReference)
: type.IsValueType ? ConversionSymbol.Create(ConversionKind.Unboxing)
: ConversionSymbol.Create(ConversionKind.NoConversion);
if (outer.Exists)
{
return(ConversionSymbol.Create(outer, inner));
}
}
}
}
else if (type.NativeType == NativeType.Usual && expr.Datatype.IsReferenceType)
{
var inner = Conversion(expr, Compilation.Get(NativeType.Object), options | BindOptions.Explicit);
if (inner.Exists)
{
var outer = Conversion(TypeConversion.Bound(expr, Compilation.Get(NativeType.Object), inner), type, options);
if (outer.Exists)
{
return(ConversionSymbol.Create(outer, inner));
}
}
}
return(null);
}
Arg ApplyUsualConversions(ArgList args, out Expr writeBack)
{
writeBack = null;
bool hasRefArgs = false;
for (int i = 0; i < args.Args.Count; i++)
{
var e = args.Args[i].Expr;
Convert(ref e, Compilation.Get(NativeType.Usual));
if (args.Args[i].RefKind != RefKind.None)
{
hasRefArgs = true;
}
}
var arguments = new Arg(LiteralArray.Bound(args.Args));
if (hasRefArgs)
{
var conv = ConversionSymbol.Create(ConversionSymbol.Create(ConversionKind.Identity), new ConversionToTemp(arguments.Expr.Datatype));
Convert(ref arguments.Expr, arguments.Expr.Datatype, conv);
for (int i = 0; i < args.Args.Count; i++)
{
if (args.Args[i].RefKind != RefKind.None)
{
HandleVarArgWriteBack(conv, args.Args[i].Expr, i, ref writeBack);
}
}
}
return(arguments);
void HandleVarArgWriteBack(ConversionSymbol conv, Expr e, int i, ref Expr wb)
{
if (e.Symbol?.HasSetAccess == true || e is AutoVarExpr || e is AliasExpr)
{
// Handle writeBack
Expr t = IdExpr.Bound(conv.IndirectRefConversionTempLocal());
t = ArrayAccessExpr.Bound(t, ArgList.Bound(LiteralExpr.Bound(Constant.Create(i + 1))), this);
var wc = Conversion(t, e.Datatype, BindOptions.Default);
if (wc.Exists)
{
Convert(ref t, e.Datatype, wc);
SymbolExtensions.AddExpr(ref wb, AssignExpr.Bound(e, t, BindOptions.Default));
}
}
}
}
internal static bool CheckBinaryOperator(Expr left, Expr right, MethodSymbol m,
ref ConversionSymbol lconv, ref ConversionSymbol rconv, BindOptions options)
{
var method = m.Method;
if (!m.Method.IsStatic || (options.HasFlag(BindOptions.Special) && !m.Method.IsSpecialName))
{
return(false);
}
var parameters = method.GetParameters();
if (parameters.Length != 2)
{
return(false);
}
var ltype = FindType(parameters[0].ParameterType);
var rtype = FindType(parameters[1].ParameterType);
if (TypesMatch(ltype, left.Datatype) && TypesMatch(rtype, right.Datatype))
{
lconv = ConversionSymbol.Create(ConversionKind.Identity);
rconv = ConversionSymbol.Create(ConversionKind.Identity);
return(true);
}
var _lconv = Conversion(left, ltype, options);
var _rconv = Conversion(right, rtype, options);
if (_lconv.IsImplicit && _rconv.IsImplicit)
{
if (lconv == null && rconv == null)
{
lconv = _lconv;
rconv = _rconv;
return(true);
}
var cost = lconv?.Cost + rconv?.Cost;
var _cost = _lconv.Cost + _rconv.Cost;
if (_cost < cost)
{
lconv = _lconv;
rconv = _rconv;
return(true);
}
}
return(false);
}
internal static ConversionSymbol ResolveByRefConversion(Expr expr, TypeSymbol type, BindOptions options)
{
if (type.IsByRef && TypesMatch(expr.Datatype, type.ElementType))
{
return(ConversionSymbol.CreateByRef());
}
else
{
var inner = ConversionSymbol.Create(ConversionKind.Deref);
var outer = Conversion(TypeConversion.Bound(expr, expr.Datatype.ElementType, inner), type, options);
if (outer.Exists)
{
return(ConversionSymbol.Create(outer, inner));
}
}
return(null);
}
internal ConversionToTemp(ConversionSymbol conv, TypeSymbol type) : base(conv.Kind)
{
Conversion = conv; Type = type;
}
internal ConversionChain(ConversionSymbol conv, ConversionSymbol prev) : base(conv.Kind)
{
Conversion = conv; Previous = prev;
}
void ApplyConversions(ArgList args, OverloadResult ovRes, out Expr writeBack)
{
writeBack = null;
var parameters = ovRes.Parameters.Parameters;
for (int i = 0; i < ovRes.FixedArgs; i++)
{
var conv = ovRes.Conversions[i];
var e = args.Args[i].Expr;
if (conv.Kind != ConversionKind.Identity)
{
Convert(ref args.Args[i].Expr, FindType(parameters[i].ParameterType), conv);
}
if (conv is ConversionSymbolToConstant)
{
Convert(ref args.Args[i].Expr, FindType(parameters[i].ParameterType), BindOptions.Default);
}
HandleArgWriteBack(conv, e, ref writeBack);
}
if (ovRes.MissingArgs > 0)
{
for (int i = ovRes.FixedArgs; i < ovRes.FixedArgs + ovRes.MissingArgs; i++)
{
var conv = ovRes.Conversions[i];
var a = new Arg(LiteralExpr.Bound(((ConversionSymbolToConstant)conv).Constant));
Convert(ref a.Expr, FindType(parameters[i].ParameterType), BindOptions.Default);
args.Args.Add(a);
}
}
else if (ovRes.Parameters.HasParamArray)
{
var varArgs = new List <Expr>(ovRes.VarArgs);
var varArgType = FindType(parameters[ovRes.FixedArgs].ParameterType.GetElementType());
bool hasRefArgs = false;
for (int i = ovRes.FixedArgs; i < ovRes.FixedArgs + ovRes.VarArgs; i++)
{
var conv = ovRes.Conversions[i];
var e = args.Args[i].Expr;
Convert(ref e, varArgType, conv);
varArgs.Add(e);
if (args.Args[i].RefKind != RefKind.None)
{
hasRefArgs = true;
}
}
var varArg = new Arg(LiteralArray.Bound(varArgs, varArgType));
if (hasRefArgs)
{
var conv = ConversionSymbol.Create(ConversionSymbol.Create(ConversionKind.Identity), new ConversionToTemp(varArg.Expr.Datatype));
Convert(ref varArg.Expr, varArg.Expr.Datatype, conv);
for (int i = ovRes.FixedArgs; i < ovRes.FixedArgs + ovRes.VarArgs; i++)
{
if (args.Args[i].RefKind != RefKind.None)
{
HandleVarArgWriteBack(conv, args.Args[i].Expr, i - ovRes.FixedArgs, ref writeBack);
}
}
}
while (args.Args.Count > ovRes.FixedArgs)
{
args.Args.RemoveAt(args.Args.Count - 1);
}
args.Args.Add(varArg);
}
void HandleArgWriteBack(ConversionSymbol conv, Expr e, ref Expr wb)
{
if (conv.IsIndirectRefConversion())
{
if (e.Symbol?.HasSetAccess == true || e is AutoVarExpr || e is AliasExpr)
{
// Handle writeBack
Expr t = IdExpr.Bound(conv.IndirectRefConversionTempLocal());
var wc = Conversion(t, e.Datatype, BindOptions.Default);
if (wc.Exists)
{
Convert(ref t, e.Datatype, wc);
SymbolExtensions.AddExpr(ref wb, AssignExpr.Bound(e, t, BindOptions.Default));
}
}
}
}
void HandleVarArgWriteBack(ConversionSymbol conv, Expr e, int i, ref Expr wb)
{
if (e.Symbol?.HasSetAccess == true || e is AutoVarExpr || e is AliasExpr)
{
// Handle writeBack
Expr t = IdExpr.Bound(conv.IndirectRefConversionTempLocal());
t = ArrayAccessExpr.Bound(t, ArgList.Bound(LiteralExpr.Bound(Constant.Create(i + 1))), this);
var wc = Conversion(t, e.Datatype, BindOptions.Default);
if (wc.Exists)
{
Convert(ref t, e.Datatype, wc);
SymbolExtensions.AddExpr(ref wb, AssignExpr.Bound(e, t, BindOptions.Default));
}
}
}
}
internal static BinaryOperatorSymbol UserDefinedBinaryOperator(BinaryOperatorKind kind, ref Expr left, ref Expr right, BindOptions options)
{
MethodSymbol mop = null;
ConversionSymbol lconv = null;
ConversionSymbol rconv = null;
bool hasUsual = left.Datatype.NativeType == NativeType.Usual || right.Datatype.NativeType == NativeType.Usual;
if (options.HasFlag(BindOptions.AllowInexactComparisons))
{
bool hasString = left.Datatype.NativeType == NativeType.String || right.Datatype.NativeType == NativeType.String;
bool bothStrings = left.Datatype.NativeType == NativeType.String && right.Datatype.NativeType == NativeType.String;
switch (kind)
{
case BinaryOperatorKind.Equal:
if (bothStrings)
{
ResolveBinaryOperator(left, right, Compilation.Get(WellKnownMembers.XSharp_RT_Functions___StringEquals), ref mop, ref lconv, ref rconv, options);
}
else if (hasString)
{
ResolveBinaryOperator(left, right, Compilation.Get(NativeType.Usual).Lookup(OperatorNames.__UsualInExactEquals), ref mop, ref lconv, ref rconv, options);
}
break;
case BinaryOperatorKind.NotEqual:
if (bothStrings)
{
ResolveBinaryOperator(left, right, Compilation.Get(WellKnownMembers.XSharp_RT_Functions___StringNotEquals), ref mop, ref lconv, ref rconv, options);
}
else if (hasString)
{
ResolveBinaryOperator(left, right, Compilation.Get(NativeType.Usual).Lookup(OperatorNames.__UsualInExactNotEquals), ref mop, ref lconv, ref rconv, options);
}
break;
case BinaryOperatorKind.GreaterThan:
case BinaryOperatorKind.LessThan:
case BinaryOperatorKind.GreaterThanOrEqual:
case BinaryOperatorKind.LessThanOrEqual:
if (bothStrings)
{
ResolveBinaryOperator(left, right, Compilation.Get(WellKnownMembers.XSharp_RT_Functions___StringCompare), ref mop, ref lconv, ref rconv, options);
}
break;
}
}
else
{
switch (kind)
{
case BinaryOperatorKind.Equal:
case BinaryOperatorKind.NotEqual:
case BinaryOperatorKind.GreaterThan:
case BinaryOperatorKind.LessThan:
case BinaryOperatorKind.GreaterThanOrEqual:
case BinaryOperatorKind.LessThanOrEqual:
if (left.Datatype.NativeType == NativeType.String && right.Datatype.NativeType == NativeType.String)
{
ResolveBinaryOperator(left, right, Compilation.Get(WellKnownMembers.System_String_CompareOrdinal), ref mop, ref lconv, ref rconv, options);
}
break;
}
}
if (mop == null)
{
var name = BinaryOperatorSymbol.OperatorName(kind);
if (name != null)
{
ResolveBinaryOperator(left, right, left.Datatype.Lookup(name), ref mop, ref lconv, ref rconv, options | BindOptions.Special);
ResolveBinaryOperator(left, right, right.Datatype.Lookup(name), ref mop, ref lconv, ref rconv, options | BindOptions.Special);
}
}
if (mop == null && kind == BinaryOperatorKind.Exponent)
{
ResolveBinaryOperator(left, right, Compilation.Get(WellKnownMembers.XSharp_RT_Functions_POW), ref mop, ref lconv, ref rconv, options);
if (hasUsual)
{
ResolveBinaryOperator(left, right, left.Datatype.Lookup(OperatorNames.__UsualExponent), ref mop, ref lconv, ref rconv, options);
ResolveBinaryOperator(left, right, right.Datatype.Lookup(OperatorNames.__UsualExponent), ref mop, ref lconv, ref rconv, options);
}
}
if (mop != null)
{
var op = BinaryOperatorSymbol.Create(kind, mop, lconv, rconv);
ApplyBinaryOperator(ref left, ref right, op);
return(op);
}
return(null);
}
internal ConversionToTemp(TypeSymbol type) : base(ConversionKind.ImplicitUserDefined)
{
Conversion = ConversionSymbol.Create(ConversionKind.Identity); Type = type; Local = new LocalSymbol(Type);
}
internal ConversionToTemp(ConversionSymbol conv, TypeSymbol type) : base(conv.Kind == ConversionKind.Identity ? ConversionKind.ImplicitUserDefined : conv.Kind)
{
Conversion = conv; Type = type; Local = new LocalSymbol(Type);
}
internal ConversionChain(ConversionSymbol conv, ConversionSymbol prev) : base(conv.Kind == ConversionKind.Identity ? ConversionKind.ImplicitUserDefined : conv.Kind)
{
Conversion = conv; Previous = prev;
}
internal static UnaryOperatorSymbolWithMethod Create(UnaryOperatorKind kind, MethodSymbol method, ConversionSymbol conv)
{
return(new UnaryOperatorSymbolWithMethod(kind, method, conv));
}
internal UnaryOperatorSymbolWithMethod(UnaryOperatorKind kind, MethodSymbol method,
ConversionSymbol conv) : base(kind, OperandType.Error)
{
Method = method;
Conv = conv;
}