Fix #1873: Clear ILRange in CopyPropagation

dgrunwald · dgrunwald · commit 587a359e8c37 · 2025-08-23T20:05:45.000+02:00
We are copying an expression from far away, reusing the ILRange would result in incorrect sequence points.
diff --git a/ICSharpCode.Decompiler/IL/Transforms/CopyPropagation.cs b/ICSharpCode.Decompiler/IL/Transforms/CopyPropagation.cs
@@ -165,6 +165,8 @@ static void DoPropagate(ILVariable v, ILInstruction copiedExpr, Block block, ref
 				{
 					clone.Children[j].ReplaceWith(new LdLoc(uninlinedArgs[j]));
 				}
+				// We are copying an expression from far away, reusing the ILRange would result in incorrect sequence points.
+				clone.SetILRange(new Interval());
 				expr.ReplaceWith(clone);
 			}
 			block.Instructions.RemoveAt(i);

Original file line number	Diff line number	Diff line change
`@@ -165,6 +165,8 @@ static void DoPropagate(ILVariable v, ILInstruction copiedExpr, Block block, ref`
`165`	`165`	`{`
`166`	`166`	`clone.Children[j].ReplaceWith(new LdLoc(uninlinedArgs[j]));`
`167`	`167`	`}`
	`168`	`+ // We are copying an expression from far away, reusing the ILRange would result in incorrect sequence points.`
	`169`	`+ clone.SetILRange(new Interval());`
`168`	`170`	`expr.ReplaceWith(clone);`
`169`	`171`	`}`
`170`	`172`	`block.Instructions.RemoveAt(i);`