private MethodCandidate MakeDefaultCandidate(MethodBase method, List<ParameterWrapper> parameters, ArgBuilder instanceBuilder, List<ArgBuilder> argBuilders, List<ArgBuilder> defaultBuilders, ReturnBuilder returnBuilder, int defaultsUsed) {
List<ArgBuilder> defaultArgBuilders = new List<ArgBuilder>(argBuilders); // argBuilders.GetRange(0, argBuilders.Count - i);
List<ParameterWrapper> necessaryParams = parameters.GetRange(0, parameters.Count - defaultsUsed);
for (int curDefault = 0; curDefault < defaultsUsed; curDefault++) {
int readIndex = defaultBuilders.Count - defaultsUsed + curDefault;
int writeIndex = defaultArgBuilders.Count - defaultsUsed + curDefault;
if (defaultBuilders[readIndex] != null) {
defaultArgBuilders[writeIndex] = defaultBuilders[readIndex];
} else {
necessaryParams.Add(parameters[parameters.Count - defaultsUsed + curDefault]);
}
}
// shift any arguments forward that need to be...
int curArg = CompilerHelpers.IsStatic(method) ? 0 : 1;
for (int i = 0; i < defaultArgBuilders.Count; i++) {
if (defaultArgBuilders[i] is DefaultArgBuilder ||
defaultArgBuilders[i] is ContextArgBuilder ||
defaultArgBuilders[i] is KeywordArgBuilder) {
continue;
}
ReferenceArgBuilder rab = defaultArgBuilders[i] as ReferenceArgBuilder;
if (rab != null) {
defaultArgBuilders[i] = new ReferenceArgBuilder(curArg++, rab.Type);
continue;
}
SimpleArgBuilder sab = (SimpleArgBuilder)defaultArgBuilders[i];
Debug.Assert(sab.GetType() == typeof(SimpleArgBuilder));
defaultArgBuilders[i] = new SimpleArgBuilder(curArg++, sab.Type, sab.IsParamsArray, sab.IsParamsDict);
}
return MakeMethodCandidate(method, necessaryParams, instanceBuilder, defaultArgBuilders, returnBuilder);
}
private void AddBasicMethodTargets(MethodBase method) {
List<ParameterWrapper> parameters = new List<ParameterWrapper>();
int argIndex = 0;
ArgBuilder instanceBuilder;
bool hasDefaults = false;
if (!CompilerHelpers.IsStatic(method)) {
parameters.Add(new ParameterWrapper(_binder, method.DeclaringType, true));
instanceBuilder = new SimpleArgBuilder(argIndex++, parameters[0].Type);
} else {
instanceBuilder = new NullArgBuilder();
}
ParameterInfo[] methodParams = method.GetParameters();
List<ArgBuilder> argBuilders = new List<ArgBuilder>(methodParams.Length);
List<ArgBuilder> defaultBuilders = new List<ArgBuilder>();
bool hasByRefOrOut = false;
foreach (ParameterInfo pi in methodParams) {
if (pi.ParameterType == typeof(CodeContext) && argBuilders.Count == 0) {
argBuilders.Add(new ContextArgBuilder());
continue;
}
int newIndex, kwIndex = GetKeywordIndex(pi);
if (kwIndex == -1) {
if (!CompilerHelpers.IsMandatoryParameter(pi)) {
defaultBuilders.Add(new DefaultArgBuilder(pi.ParameterType, pi.DefaultValue));
hasDefaults = true;
} else if (defaultBuilders.Count > 0) {
defaultBuilders.Add(null);
}
newIndex = argIndex++;
} else {
defaultBuilders.Add(null);
newIndex = 0;
}
ArgBuilder ab;
if (pi.ParameterType.IsByRef) {
hasByRefOrOut = true;
Type refType = typeof(StrongBox<>).MakeGenericType(pi.ParameterType.GetElementType());
ParameterWrapper param = new ParameterWrapper(_binder, refType, true, SymbolTable.StringToId(pi.Name));
parameters.Add(param);
ab = new ReferenceArgBuilder(newIndex, param.Type);
} else {
hasByRefOrOut |= CompilerHelpers.IsOutParameter(pi);
ParameterWrapper param = new ParameterWrapper(_binder, pi);
parameters.Add(param);
ab = new SimpleArgBuilder(newIndex, param.Type, pi);
}
if (kwIndex == -1) {
argBuilders.Add(ab);
} else {
argBuilders.Add(new KeywordArgBuilder(ab, _kwArgs.Length, kwIndex));
}
}
ReturnBuilder returnBuilder = MakeKeywordReturnBuilder(
new ReturnBuilder(CompilerHelpers.GetReturnType(method)),
methodParams,
parameters);
if (hasDefaults) {
for (int defaultsUsed = 1; defaultsUsed < defaultBuilders.Count + 1; defaultsUsed++) {
// if the left most default we'll use is not present then don't add a default. This happens in cases such as:
// a(a=1, b=2, c=3) and then call with a(a=5, c=3). We'll come through once for c (no default, skip),
// once for b (default present, emit) and then a (no default, skip again). W/o skipping we'd generate the same
// method multiple times. This also happens w/ non-contigious default values, e.g. foo(a, b=3, c) where we don't want
// to generate a default candidate for just c which matches the normal method.
if (defaultBuilders[defaultBuilders.Count - defaultsUsed] != null) {
AddTarget(MakeDefaultCandidate(
method,
parameters,
instanceBuilder,
argBuilders,
defaultBuilders,
returnBuilder,
defaultsUsed));
}
}
}
if (hasByRefOrOut) AddSimpleTarget(MakeByRefReducedMethodTarget(method));
AddSimpleTarget(MakeMethodCandidate(method, parameters, instanceBuilder, argBuilders, returnBuilder));
}
