public override void RewriteConditional(ref BasicBlock block)
{
var evaluated = Context.Options.IsFeatureEnabled(Feature);
Scanner.LogDebug(1, $"REWRITE FEATURE CONDITIONAL: {Feature} {evaluated}");
if (evaluated)
{
BlockList.DeleteBlock(ref block);
return;
}
Context.LogMessage(MessageImportance.High, Environment.NewLine);
Context.LogMessage(MessageImportance.High, $"Required feature `{Feature}` not available.");
#if FIXME
Context.Context.Tracer.Dump();
#endif
Context.LogMessage(MessageImportance.High, Environment.NewLine);
var pns = Context.Context.GetType("System.PlatformNotSupportedException");
var ctor = pns?.Methods.FirstOrDefault(m => m.Name == ".ctor");
if (ctor == null)
{
throw new OptimizerAssertionException($"Can't find `System.PlatformNotSupportedException`.");
}
Scanner.LogDebug(1, $"REWRITE FEATURE CONDITIONAL #1: {pns} {ctor}");
var reference = Method.DeclaringType.Module.ImportReference(ctor);
BlockList.ReplaceInstructionAt(ref block, 0, Instruction.Create(OpCodes.Newobj, reference));
BlockList.ReplaceInstructionAt(ref block, 1, Instruction.Create(OpCodes.Throw));
}
void RewriteAsIsInst(ref BasicBlock block)
{
Scanner.LogDebug(1, $"REWRITE AS ISINST: {block.Count} {block}");
var reference = Assembly.MainModule.ImportReference(InstanceType);
int index = 1;
BlockList.InsertInstructionAt(ref block, index++, Instruction.Create(OpCodes.Isinst, reference));
BlockList.InsertInstructionAt(ref block, index++, Instruction.Create(OpCodes.Dup));
BlockList.ReplaceInstructionAt(ref block, index++, Instruction.Create(OpCodes.Stloc, Variable));
BlockList.RemoveInstructionAt(ref block, index);
switch (block.BranchType)
{
case BranchType.False:
case BranchType.True:
break;
case BranchType.None:
case BranchType.Return:
// Convert it into a bool.
BlockList.InsertInstructionAt(ref block, index++, Instruction.Create(OpCodes.Ldnull));
BlockList.InsertInstructionAt(ref block, index++, Instruction.Create(OpCodes.Cgt_Un));
break;
default:
throw DebugHelpers.AssertFailUnexpected(Method, block, block.BranchType);
}
}