internal static FindResult CanExtendNamedArgument(Block block, ILVariable v, ILInstruction expressionBeingMoved)
{
Debug.Assert(block.Kind == BlockKind.CallWithNamedArgs);
var firstArg = ((StLoc)block.Instructions[0]).Value;
var r = ILInlining.FindLoadInNext(firstArg, v, expressionBeingMoved, InliningOptions.IntroduceNamedArguments);
if (r.Type == FindResultType.Found || r.Type == FindResultType.NamedArgument)
{
return(r); // OK, inline into first instruction of block
}
var call = (CallInstruction)block.FinalInstruction;
if (call.IsInstanceCall)
{
// For instance calls, block.Instructions[0] is the argument
// for the 'this' pointer. We can only insert at position 1.
if (r.Type == FindResultType.Stop)
{
// error: can't move expressionBeingMoved after block.Instructions[0]
return(FindResult.Stop);
}
// Because we always ensure block.Instructions[0] is the 'this' argument,
// it's possible that the place we actually need to inline into
// is within block.Instructions[1]:
if (block.Instructions.Count > 1)
{
r = ILInlining.FindLoadInNext(block.Instructions[1], v, expressionBeingMoved, InliningOptions.IntroduceNamedArguments);
if (r.Type == FindResultType.Found || r.Type == FindResultType.NamedArgument)
{
return(r); // OK, inline into block.Instructions[1]
}
}
}
foreach (var arg in call.Arguments)
{
if (arg.MatchLdLoc(v))
{
return(FindResult.NamedArgument(arg, arg));
}
}
return(FindResult.Stop);
}
internal static FindResult CanIntroduceNamedArgument(CallInstruction call, ILInstruction child, ILVariable v, ILInstruction expressionBeingMoved)
{
Debug.Assert(child.Parent == call);
if (call.IsInstanceCall && child.ChildIndex == 0)
{
return(FindResult.Stop); // cannot use named arg to move expressionBeingMoved before this pointer
}
if (call.Method.IsOperator || call.Method.IsAccessor)
{
return(FindResult.Stop); // cannot use named arg for operators or accessors
}
if (call.Method is VarArgInstanceMethod)
{
return(FindResult.Stop); // CallBuilder doesn't support named args when using varargs
}
if (call.Method.IsConstructor)
{
IType type = call.Method.DeclaringType;
if (type.Kind == TypeKind.Delegate || type.IsAnonymousType())
{
return(FindResult.Stop);
}
}
if (call.Method.Parameters.Any(p => string.IsNullOrEmpty(p.Name)))
{
return(FindResult.Stop); // cannot use named arguments
}
for (int i = child.ChildIndex; i < call.Arguments.Count; i++)
{
var r = ILInlining.FindLoadInNext(call.Arguments[i], v, expressionBeingMoved, InliningOptions.None);
if (r.Type == FindResultType.Found)
{
return(FindResult.NamedArgument(r.LoadInst, call.Arguments[i]));
}
}
return(FindResult.Stop);
}