public override ISymbolValue this[DVariable n]
{
get
{
if (n == null)
{
throw new ArgumentNullException("There must be a valid variable node given in order to retrieve its value");
}
if (n.IsConst)
{
// .. resolve it's pre-compile time value and make the returned value the given argument
var val = Evaluation.EvaluateValue(n.Initializer, this);
// If it's null, then the initializer is null - which is equal to e.g. 0 or null !;
if (val != null)
{
return(val);
}
}
throw new ArgumentException(n + " must have a constant initializer");
}
set
{
throw new NotImplementedException();
}
}
public static bool IsEqual(IExpression ex, IExpression ex2, AbstractSymbolValueProvider vp)
{
var val_x1 = Evaluation.EvaluateValue(ex, vp);
var val_x2 = Evaluation.EvaluateValue(ex2, vp);
//TEMPORARILY: Remove the string comparison
if (val_x1 == null && val_x2 == null)
return ex.ToString() == ex2.ToString();
return IsEqual(val_x1, val_x2);
}
/// <summary>
/// Used when evaluating traits.
/// Evaluates the first argument to <param name="t">t</param>,
/// takes the second traits argument, tries to evaluate it to a string, and puts it + the first arg into an postfix_access expression
/// </summary>
internal static PostfixExpression_Access prepareMemberTraitExpression(ResolutionContext ctxt, TraitsExpression te, out AbstractType t, AbstractSymbolValueProvider vp = null)
{
if (te.Arguments != null && te.Arguments.Length == 2)
{
var tEx = te.Arguments[0];
t = DResolver.StripMemberSymbols(ResolveTraitArgument(ctxt, tEx));
if (t == null)
{
ctxt.LogError(te, "First argument didn't resolve to a type");
}
else if (te.Arguments[1].AssignExpression != null)
{
var litEx = te.Arguments[1].AssignExpression;
var v = vp != null?Evaluation.EvaluateValue(litEx, vp) : Evaluation.EvaluateValue(litEx, ctxt);
if (v is ArrayValue && (v as ArrayValue).IsString)
{
var av = v as ArrayValue;
// Mock up a postfix_access expression to ensure static properties & ufcs methods are checked either
return(new PostfixExpression_Access
{
PostfixForeExpression = tEx.AssignExpression ?? new TypeDeclarationExpression(tEx.Type),
AccessExpression = new IdentifierExpression(av.StringValue)
{
Location = litEx.Location,
EndLocation = litEx.EndLocation
},
EndLocation = litEx.EndLocation
});
}
else
{
ctxt.LogError(litEx, "Second traits argument must evaluate to a string literal");
}
}
else
{
ctxt.LogError(te, "Second traits argument must be an expression");
}
}
t = null;
return(null);
}
public override ISymbolValue this[DVariable n]
{
get
{
if (n == null)
{
return(new ErrorValue(new EvaluationException("There must be a valid variable node given in order to retrieve its value")));
}
if (n.IsConst)
{
if (varsBeingResolved.Contains(n))
{
return(new ErrorValue(new EvaluationException("Cannot reference itself")));
}
varsBeingResolved.Add(n);
// .. resolve it's pre-compile time value and make the returned value the given argument
ISymbolValue val;
try{
val = Evaluation.EvaluateValue(n.Initializer, this);
}
finally{
varsBeingResolved.Remove(n);
}
// If it's null, then the initializer is null - which is equal to e.g. 0 or null !;
if (val != null)
{
return(val);
}
}
return(new ErrorValue(new EvaluationException(n + " must have a constant initializer")));
}
set
{
throw new NotImplementedException();
}
}
public static AbstractType EvalMethodCall(AbstractType[] baseExpression, ISymbolValue baseValue, TemplateInstanceExpression tix,
ResolutionContext ctxt,
PostfixExpression_MethodCall call, out List <ISemantic> callArguments, out ISymbolValue delegateValue,
bool returnBaseTypeOnly, AbstractSymbolValueProvider ValueProvider = null)
{
//TODO: Refactor this crap!
delegateValue = null;
callArguments = null;
var methodOverloads = new List <AbstractType>();
#region Search possible methods, opCalls or delegates that could be called
bool requireStaticItems = true; //TODO: What if there's an opCall and a foreign method at the same time? - and then this variable would be bullshit
IEnumerable <AbstractType> scanResults = baseExpression;
var nextResults = new List <AbstractType>();
while (scanResults != null)
{
foreach (var b in scanResults)
{
if (b is AmbiguousType)
{
nextResults.AddRange((b as AmbiguousType).Overloads);
}
else if (b is TemplateParameterSymbol)
{
nextResults.Add((b as TemplateParameterSymbol).Base);
}
else if (b is MemberSymbol)
{
var mr = (MemberSymbol)b;
if (mr.Definition is DMethod)
{
methodOverloads.Add(mr);
continue;
}
else if (mr.Definition is DVariable)
{
// If we've got a variable here, get its base type/value reference
if (ValueProvider != null)
{
var dgVal = ValueProvider[(DVariable)mr.Definition] as DelegateValue;
if (dgVal != null)
{
nextResults.Add(dgVal.Definition);
continue;
}
else
{
ValueProvider.LogError(call, "Variable must be a delegate, not anything else");
return(null);
}
}
else
{
var bt = mr.Base ?? TypeDeclarationResolver.ResolveSingle(mr.Definition.Type, ctxt);
// Must be of type delegate
if (bt is DelegateType)
{
var ret = HandleCallDelegateType(ValueProvider, bt as DelegateType, methodOverloads, returnBaseTypeOnly);
if (ret is ISymbolValue)
{
delegateValue = ret as ISymbolValue;
return(null);
}
else if (ret is AbstractType)
{
return(ret as AbstractType);
}
}
else
{
/*
* If mr.Node is not a method, so e.g. if it's a variable
* pointing to a delegate
*
* class Foo
* {
* string opCall() { return "asdf"; }
* }
*
* Foo f=new Foo();
* f(); -- calls opCall, opCall is not static
*/
nextResults.Add(bt);
requireStaticItems = false;
}
//TODO: Can other types work as function/are callable?
}
}
}
else if (b is DelegateType)
{
var ret = HandleCallDelegateType(ValueProvider, b as DelegateType, methodOverloads, returnBaseTypeOnly);
if (ret is ISymbolValue)
{
delegateValue = ret as ISymbolValue;
return(null);
}
else if (ret is AbstractType)
{
return(ret as AbstractType);
}
}
else if (b is ClassType || b is StructType)
{
var tit = (TemplateIntermediateType)b;
/*
* auto a = MyStruct(); -- opCall-Overloads can be used
*/
var classDef = tit.Definition;
if (classDef == null)
{
continue;
}
foreach (var i in ExpressionTypeEvaluation.GetOpCalls(tit, requireStaticItems))
{
methodOverloads.Add(TypeDeclarationResolver.HandleNodeMatch(i, ctxt, b, call) as MemberSymbol);
}
/*
* Every struct can contain a default ctor:
*
* struct S { int a; bool b; }
*
* auto s = S(1,true); -- ok
* auto s2= new S(2,false); -- error, no constructor found!
*/
if (b is StructType && methodOverloads.Count == 0)
{
//TODO: Deduce parameters
return(b);
}
}
/*
* If the overload is a template, it quite exclusively means that we'll handle a method that is the only
* child inside a template + that is named as the template.
*/
else if (b is TemplateType)
{
methodOverloads.Add(b);
}
else if (b is PrimitiveType) // dmd 2.066: Uniform Construction Syntax. creal(3) is of type creal.
{
methodOverloads.Add(b);
}
}
scanResults = nextResults.Count == 0 ? null : nextResults.ToArray();
nextResults.Clear();
}
#endregion
if (methodOverloads.Count == 0)
{
return(null);
}
// Get all arguments' types
callArguments = new List <ISemantic>();
if (call.Arguments != null)
{
if (ValueProvider != null)
{
foreach (var arg in call.Arguments)
{
callArguments.Add(arg != null ? Evaluation.EvaluateValue(arg, ValueProvider) : null);
}
}
else
{
foreach (var arg in call.Arguments)
{
callArguments.Add(arg != null ? ExpressionTypeEvaluation.EvaluateType(arg, ctxt) : null);
}
}
}
#region If explicit template type args were given, try to associate them with each overload
if (tix != null)
{
var args = TemplateInstanceHandler.PreResolveTemplateArgs(tix, ctxt);
var deducedOverloads = TemplateInstanceHandler.DeduceParamsAndFilterOverloads(methodOverloads, args, true, ctxt);
methodOverloads.Clear();
if (deducedOverloads != null)
{
methodOverloads.AddRange(deducedOverloads);
}
}
#endregion
#region Filter by parameter-argument comparison
var argTypeFilteredOverloads = new List <AbstractType>();
bool hasHandledUfcsResultBefore = false;
AbstractType untemplatedMethodResult = null;
foreach (var ov in methodOverloads)
{
if (ov is MemberSymbol)
{
HandleDMethodOverload(ctxt, ValueProvider != null, baseValue, callArguments, returnBaseTypeOnly, argTypeFilteredOverloads, ref hasHandledUfcsResultBefore,
ov as MemberSymbol, ref untemplatedMethodResult);
}
else if (ov is DelegateType)
{
var dg = ov as DelegateType;
var bt = dg.Base ?? TypeDeclarationResolver.GetMethodReturnType(dg, ctxt);
//TODO: Param-Arg check
if (returnBaseTypeOnly)
{
argTypeFilteredOverloads.Add(bt);
}
else
{
if (dg.Base == null)
{
if (dg.IsFunctionLiteral)
{
dg = new DelegateType(bt, dg.DeclarationOrExpressionBase as FunctionLiteral, dg.Parameters);
}
else
{
dg = new DelegateType(bt, dg.DeclarationOrExpressionBase as DelegateDeclaration, dg.Parameters);
}
}
argTypeFilteredOverloads.Add(new DelegateCallSymbol(dg, call));
}
}
else if (ov is PrimitiveType) // dmd 2.066: Uniform Construction Syntax. creal(3) is of type creal.
{
if (ValueProvider != null)
{
if (callArguments == null || callArguments.Count != 1)
{
ValueProvider.LogError(call, "Uniform construction syntax expects exactly one argument");
}
else
{
var pv = callArguments[0] as PrimitiveValue;
if (pv == null)
{
ValueProvider.LogError(call, "Uniform construction syntax expects one built-in scalar value as first argument");
}
else
{
delegateValue = new PrimitiveValue(pv.Value, ov as PrimitiveType, pv.ImaginaryPart);
}
}
}
argTypeFilteredOverloads.Add(ov);
}
}
// Prefer untemplated methods over templated ones
if (untemplatedMethodResult != null)
{
return(untemplatedMethodResult);
}
#endregion
return(AmbiguousType.Get(argTypeFilteredOverloads, tix));
}
public AbstractType Visit(PostfixExpression_Index x)
{
var foreExpression = EvalForeExpression(x);
// myArray[0]; myArray[0..5];
// opIndex/opSlice ?
if (foreExpression is MemberSymbol)
{
foreExpression = DResolver.StripMemberSymbols(foreExpression);
}
var udt = foreExpression as UserDefinedType;
if (udt != null)
{
ctxt.CurrentContext.IntroduceTemplateParameterTypes(udt);
var overloads = TypeDeclarationResolver.ResolveFurtherTypeIdentifier(OpIndexIdHash, AmbiguousType.TryDissolve(foreExpression), ctxt, x, false);
if (overloads != null && overloads.Length > 0)
{
var indexArgs = x.Arguments != null ? new AbstractType[x.Arguments.Length] : null;
for (int i = 0; i < indexArgs.Length; i++)
{
if (x.Arguments[i] != null)
{
indexArgs[i] = x.Arguments[i].Accept(this);
}
}
overloads = TemplateInstanceHandler.DeduceParamsAndFilterOverloads(overloads, indexArgs, true, ctxt);
ctxt.CurrentContext.RemoveParamTypesFromPreferredLocals(udt);
return(TryPretendMethodExecution(AmbiguousType.Get(overloads, x), x, indexArgs));
}
ctxt.CurrentContext.RemoveParamTypesFromPreferredLocals(udt);
if (foreExpression is TemplateIntermediateType)
{ //TODO: Proper resolution of alias this declarations
var tit = foreExpression as TemplateIntermediateType;
var ch = tit.Definition[DVariable.AliasThisIdentifierHash];
if (ch != null)
{
foreach (DVariable aliasThis in ch)
{
foreExpression = TypeDeclarationResolver.HandleNodeMatch(aliasThis, ctxt, foreExpression);
if (foreExpression != null)
{
break; // HACK: Just omit other alias this' to have a quick run-through
}
}
}
if (foreExpression == null)
{
return(tit);
}
}
}
foreExpression = DResolver.StripMemberSymbols(foreExpression);
if (foreExpression is AssocArrayType)
{
var ar = foreExpression as AssocArrayType;
/*
* myType_Array[0] -- returns TypeResult myType
* return the value type of a given array result
*/
//TODO: Handle opIndex overloads
if (ar.ValueType != null)
{
ar.ValueType.NonStaticAccess = true;
}
return(new ArrayAccessSymbol(x, ar.ValueType));
}
/*
* int* a = new int[10];
*
* a[0] = 12;
*/
else if (foreExpression is PointerType)
{
var b = (foreExpression as PointerType).Base;
if (b != null)
{
b.NonStaticAccess = true;
}
return(b);
}
//return new ArrayAccessSymbol(x,((PointerType)foreExpression).Base);
else if (foreExpression is DTuple)
{
var tt = foreExpression as DTuple;
if (x.Arguments != null && x.Arguments.Length != 0)
{
var idx = Evaluation.EvaluateValue(x.Arguments[0], ctxt) as PrimitiveValue;
if (tt.Items == null)
{
ctxt.LogError(tt.DeclarationOrExpressionBase, "No items in Type tuple");
}
else if (idx == null || !DTokens.IsBasicType_Integral(idx.BaseTypeToken))
{
ctxt.LogError(x.Arguments[0], "Index expression must evaluate to integer value");
}
else if (idx.Value > (decimal)Int32.MaxValue ||
(int)idx.Value >= tt.Items.Length || idx.Value < 0m)
{
ctxt.LogError(x.Arguments[0], "Index number must be a value between 0 and " + tt.Items.Length);
}
else
{
return(AbstractType.Get(tt.Items[(int)idx.Value]));
}
}
}
ctxt.LogError(x, "No matching base type for indexing operation");
return(null);
}
public AbstractType Visit(PostfixExpression_Index x)
{
var foreExpression = EvalForeExpression(x);
// myArray[0]; myArray[0..5];
// opIndex/opSlice ?
if (foreExpression is MemberSymbol)
{
foreExpression = DResolver.StripMemberSymbols(foreExpression);
}
foreExpression = DResolver.StripMemberSymbols(foreExpression);
if (foreExpression is AssocArrayType)
{
var ar = foreExpression as AssocArrayType;
/*
* myType_Array[0] -- returns TypeResult myType
* return the value type of a given array result
*/
//TODO: Handle opIndex overloads
return(new ArrayAccessSymbol(x, ar.ValueType));
}
/*
* int* a = new int[10];
*
* a[0] = 12;
*/
else if (foreExpression is PointerType)
{
return((foreExpression as PointerType).Base);
}
//return new ArrayAccessSymbol(x,((PointerType)foreExpression).Base);
else if (foreExpression is DTuple)
{
var tt = foreExpression as DTuple;
if (x.Arguments != null && x.Arguments.Length != 0)
{
var idx = Evaluation.EvaluateValue(x.Arguments[0], ctxt) as PrimitiveValue;
if (tt.Items == null)
{
ctxt.LogError(tt.DeclarationOrExpressionBase, "No items in Type tuple");
}
else if (idx == null || !DTokens.IsBasicType_Integral(idx.BaseTypeToken))
{
ctxt.LogError(x.Arguments[0], "Index expression must evaluate to integer value");
}
else if (idx.Value > (decimal)Int32.MaxValue ||
(int)idx.Value >= tt.Items.Length || idx.Value < 0m)
{
ctxt.LogError(x.Arguments[0], "Index number must be a value between 0 and " + tt.Items.Length);
}
else
{
return(AbstractType.Get(tt.Items[(int)idx.Value]));
}
}
}
ctxt.LogError(new ResolutionError(x, "Invalid base type for index expression"));
return(null);
}
