/// stloc V_1(dynamic.isevent (target))
/// if (logic.not(ldloc V_1)) Block IL_004a {
/// stloc V_2(dynamic.getmember B(target))
/// }
/// if (logic.not(ldloc V_1)) Block IL_0149 {
/// dynamic.setmember.compound B(target, dynamic.binary.operator AddAssign(ldloc V_2, value))
/// } else Block IL_0151 {
/// dynamic.invokemember.invokespecial.discard add_B(target, value)
/// }
/// =>
/// if (logic.not(dynamic.isevent (target))) Block IL_0149 {
/// dynamic.setmember.compound B(target, dynamic.binary.operator AddAssign(dynamic.getmember B(target), value))
/// } else Block IL_0151 {
/// dynamic.invokemember.invokespecial.discard add_B(target, value)
/// }
public void Run(Block block, int pos, StatementTransformContext context)
{
if (!(pos + 3 < block.Instructions.Count && block.Instructions[pos].MatchStLoc(out var flagVar, out var inst) && inst is DynamicIsEventInstruction isEvent))
{
return;
}
if (!(flagVar.IsSingleDefinition && flagVar.LoadCount == 2))
{
return;
}
if (!(MatchLhsCacheIfInstruction(block.Instructions[pos + 1], flagVar, out var dynamicGetMemberStore)))
{
return;
}
if (!(dynamicGetMemberStore.MatchStLoc(out var getMemberVar, out inst) && inst is DynamicGetMemberInstruction getMemberInst))
{
return;
}
foreach (var descendant in block.Instructions[pos + 2].Descendants)
{
if (!MatchIsEventAssignmentIfInstruction(descendant, isEvent, flagVar, getMemberVar, out var setMemberInst, out var getMemberVarUse, out var isEventConditionUse))
{
continue;
}
context.Step("DynamicIsEventAssignmentTransform", block.Instructions[pos]);
// Collapse duplicate condition
getMemberVarUse.ReplaceWith(getMemberInst);
isEventConditionUse.ReplaceWith(isEvent);
block.Instructions.RemoveRange(pos, 2);
// Reuse ExpressionTransforms
ExpressionTransforms.TransformDynamicSetMemberInstruction(setMemberInst, context);
context.RequestRerun();
break;
}
}
public void Run(ILFunction function, ILTransformContext context)
{
if (!(function.Body is BlockContainer container && container.Blocks.Count == 1))
{
return;
}
var combinedExit = CombineExits(container.EntryPoint);
if (combinedExit == null)
{
return;
}
ExpressionTransforms.RunOnSingleStatement(combinedExit, context);
}