public static IsFeatureSupportedConditional Create(BasicBlockScanner scanner, ref BasicBlock bb, ref int index)
{
if (bb.Instructions.Count == 1)
{
throw new OptimizerAssertionException();
}
if (index + 1 >= scanner.Body.Instructions.Count)
{
throw new OptimizerAssertionException();
}
/*
* `bool MonoLinkerSupport.IsFeatureSupported (MonoLinkerFeature feature)`
*
*/
if (bb.Instructions.Count > 2)
{
scanner.BlockList.SplitBlockAt(ref bb, bb.Instructions.Count - 2);
}
var feature = (MonoLinkerFeature)CecilHelper.GetFeatureArgument(bb.FirstInstruction);
var instance = new IsFeatureSupportedConditional(scanner, feature);
bb.LinkerConditional = instance;
LookAheadAfterConditional(scanner.BlockList, ref bb, ref index);
return(instance);
}
public static bool Scan(BasicBlockScanner scanner, ref BasicBlock bb, ref int index, Instruction instruction)
{
var reference = (MethodReference)instruction.Operand;
if (!scanner.Context.TryFastResolve(reference, out var target))
{
return(false);
}
if (target == null)
{
if (reference.DeclaringType.Name.Contains("..."))
{
// FIXME: we don't support Ranges yet.
return(false);
}
scanner.Context.LogMessage(MessageImportance.High, $"Cannot resolve call target: {CecilHelper.Format (instruction)}");
if (scanner.Context.Options.IgnoreResolutionErrors)
{
return(false);
}
throw new ResolutionException(reference);
}
scanner.LogDebug(2, $" CALL: {target}");
if (instruction.Operand is GenericInstanceMethod genericInstance)
{
if (scanner.Context.IsWeakInstanceOfMethod(target))
{
var conditionalType = genericInstance.GenericArguments [0].Resolve();
if (conditionalType == null)
{
throw new ResolutionException(genericInstance.GenericArguments [0]);
}
IsWeakInstanceOfConditional.Create(scanner, ref bb, ref index, conditionalType);
return(true);
}
else if (scanner.Context.AsWeakInstanceOfMethod(target))
{
var conditionalType = genericInstance.GenericArguments [0].Resolve();
if (conditionalType == null)
{
throw new ResolutionException(genericInstance.GenericArguments [0]);
}
AsWeakInstanceOfConditional.Create(scanner, ref bb, ref index, conditionalType);
return(true);
}
else if (scanner.Context.IsTypeAvailableMethod(target))
{
var conditionalType = genericInstance.GenericArguments [0].Resolve();
if (conditionalType == null)
{
throw new ResolutionException(genericInstance.GenericArguments [0]);
}
IsTypeAvailableConditional.Create(scanner, ref bb, ref index, conditionalType);
return(true);
}
return(false);
}
if (scanner.Context.IsFeatureSupportedMethod(target))
{
IsFeatureSupportedConditional.Create(scanner, ref bb, ref index);
return(true);
}
if (scanner.Context.IsTypeNameAvailableMethod(target))
{
IsTypeAvailableConditional.Create(scanner, ref bb, ref index);
return(true);
}
if (scanner.Context.IsRequireFeatureMethod(target))
{
RequireFeatureConditional.Create(scanner, ref bb, ref index);
return(true);
}
if (scanner.Context.TryGetConstantMethod(target, out var constant))
{
ConstantCallConditional.Create(scanner, ref bb, ref index, target, constant);
return(true);
}
return(false);
}
