protected void AdjustCallArgumentsForParams(CType callingObjectType, CType type, MethodOrPropertySymbol mp, TypeArray pTypeArgs, EXPR argsPtr, out EXPR newArgs)
{
Debug.Assert(mp != null);
Debug.Assert(mp.Params != null);
newArgs = null;
EXPR newArgsTail = null;
MethodOrPropertySymbol mostDerivedMethod = GroupToArgsBinder.FindMostDerivedMethod(GetSymbolLoader(), mp, callingObjectType);
int paramCount = mp.Params.size;
TypeArray @params = mp.Params;
int iDst = 0;
bool markTypeFromExternCall = mp.IsFMETHSYM() && mp.AsFMETHSYM().isExternal;
int argCount = ExpressionIterator.Count(argsPtr);
if (mp.IsFMETHSYM() && mp.AsFMETHSYM().isVarargs)
{
paramCount--; // we don't care about the vararg sentinel
}
bool bDontFixParamArray = false;
ExpressionIterator it = new ExpressionIterator(argsPtr);
if (argsPtr == null)
{
if (mp.isParamArray)
goto FIXUPPARAMLIST;
return;
}
for (; !it.AtEnd(); it.MoveNext())
{
EXPR indir = it.Current();
// this will splice the optional arguments into the list
if (indir.type.IsParameterModifierType())
{
if (paramCount != 0)
paramCount--;
if (markTypeFromExternCall)
SetExternalRef(indir.type);
GetExprFactory().AppendItemToList(indir, ref newArgs, ref newArgsTail);
}
else if (paramCount != 0)
{
if (paramCount == 1 && mp.isParamArray && argCount > mp.Params.size)
{
// we arrived at the last formal, and we have more than one actual, so
// we need to put the rest in an array...
goto FIXUPPARAMLIST;
}
EXPR argument = indir;
EXPR rval;
if (argument.isNamedArgumentSpecification())
{
int index = 0;
// If we're named, look for the type of the matching name.
foreach (Name i in mostDerivedMethod.ParameterNames)
{
if (i == argument.asNamedArgumentSpecification().Name)
{
break;
}
index++;
}
Debug.Assert(index != mp.Params.size);
CType substDestType = GetTypes().SubstType(@params.Item(index), type, pTypeArgs);
// If we cant convert the argument and we're the param array argument, then deal with it.
if (!canConvert(argument.asNamedArgumentSpecification().Value, substDestType) &&
mp.isParamArray && index == mp.Params.size - 1)
{
// We have a param array, but we're not at the end yet. This will happen
// with named arguments when the user specifies a name for the param array,
// and its not an actual array.
//
// For example:
// void Foo(int y, params int[] x);
// ...
// Foo(x:1, y:1);
CType arrayType = GetTypes().SubstType(mp.Params.Item(mp.Params.size - 1), type, pTypeArgs);
CType elemType = arrayType.AsArrayType().GetElementType();
// Use an EK_ARRINIT even in the empty case so empty param arrays in attributes work.
EXPRARRINIT arrayInit = GetExprFactory().CreateArrayInit(0, arrayType, null, null, null);
arrayInit.GeneratedForParamArray = true;
arrayInit.dimSizes = new int[] { arrayInit.dimSize };
arrayInit.dimSize = 1;
arrayInit.SetOptionalArguments(argument.asNamedArgumentSpecification().Value);
argument.asNamedArgumentSpecification().Value = arrayInit;
bDontFixParamArray = true;
}
else
{
// Otherwise, force the conversion and get errors if needed.
argument.asNamedArgumentSpecification().Value = tryConvert(
argument.asNamedArgumentSpecification().Value,
substDestType);
}
rval = argument;
}
else
{
CType substDestType = GetTypes().SubstType(@params.Item(iDst), type, pTypeArgs);
rval = tryConvert(indir, substDestType);
}
if (rval == null)
{
// the last arg failed to fix up, so it must fixup into the array element
// if we have a param array (we will be passing a 1 element array...)
if (mp.isParamArray && paramCount == 1 && argCount >= mp.Params.size)
{
goto FIXUPPARAMLIST;
}
else
{
// This is either the error case that the args are of the wrong type,
// or that we have some optional arguments being used. Either way,
// we wont need to expand the param array.
return;
}
}
Debug.Assert(rval != null);
indir = rval;
GetExprFactory().AppendItemToList(rval, ref newArgs, ref newArgsTail);
paramCount--;
}
// note that destype might not be valid if we are in varargs, but then we won't ever use it...
iDst++;
if (paramCount != 0 && mp.isParamArray && iDst == argCount)
{
// we run out of actuals, but we still have formals, so this is an empty array being passed
// into the last param...
indir = null;
it.MoveNext();
goto FIXUPPARAMLIST;
}
}
return;
FIXUPPARAMLIST:
if (bDontFixParamArray)
{
// We've already fixed the param array for named arguments.
return;
}
// we need to create an array and put it as the last arg...
CType substitutedArrayType = GetTypes().SubstType(mp.Params.Item(mp.Params.size - 1), type, pTypeArgs);
if (!substitutedArrayType.IsArrayType() || substitutedArrayType.AsArrayType().rank != 1)
{
// Invalid type for params array parameter. Happens in LAF scenarios, e.g.
//
// void Foo(int i, params int ar = null) { }
// ...
// Foo(1);
return;
}
CType elementType = substitutedArrayType.AsArrayType().GetElementType();
// Use an EK_ARRINIT even in the empty case so empty param arrays in attributes work.
EXPRARRINIT exprArrayInit = GetExprFactory().CreateArrayInit(0, substitutedArrayType, null, null, null);
exprArrayInit.GeneratedForParamArray = true;
exprArrayInit.dimSizes = new int[] { exprArrayInit.dimSize };
if (it.AtEnd())
{
exprArrayInit.dimSize = 0;
exprArrayInit.dimSizes[0] = 0;
exprArrayInit.SetOptionalArguments(null);
if (argsPtr == null)
{
argsPtr = exprArrayInit;
}
else
{
argsPtr = GetExprFactory().CreateList(argsPtr, exprArrayInit);
}
GetExprFactory().AppendItemToList(exprArrayInit, ref newArgs, ref newArgsTail);
}
else
{
// Go through the list - for each argument, do the conversion and append it to the new list.
EXPR newList = null;
EXPR newListTail = null;
int count = 0;
for (; !it.AtEnd(); it.MoveNext())
{
EXPR expr = it.Current();
count++;
if (expr.isNamedArgumentSpecification())
{
expr.asNamedArgumentSpecification().Value = tryConvert(
expr.asNamedArgumentSpecification().Value, elementType);
}
else
{
expr = tryConvert(expr, elementType);
}
GetExprFactory().AppendItemToList(expr, ref newList, ref newListTail);
}
exprArrayInit.dimSize = count;
exprArrayInit.dimSizes[0] = count;
exprArrayInit.SetOptionalArguments(newList);
GetExprFactory().AppendItemToList(exprArrayInit, ref newArgs, ref newArgsTail);
}
}
