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<TITLE> [Mono-bugs] [Bug 46222][Nor] New - Iterator (yield statement) implementation wrong
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<H1>[Mono-bugs] [Bug 46222][Nor] New - Iterator (yield statement) implementation wrong
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<B>bugzilla-daemon@rocky.ximian.com
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<A HREF="mailto:bugzilla-daemon%40rocky.ximian.com"
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TITLE="[Mono-bugs] [Bug 46222][Nor] New - Iterator (yield statement) implementation wrong">bugzilla-daemon@rocky.ximian.com
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<I>Sun, 13 Jul 2003 15:40:32 -0400 (EDT)</I>
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<LI> Previous message: <A HREF="006344.html">[Mono-bugs] [Bug 46221][Wis] New - monodis does not use full methodref name for features
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<!--beginarticle-->
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<PRE>Please do not reply to this email- if you want to comment on the bug, go to the
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URL shown below and enter your comments there.
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Changed by <A HREF="mailto:sestoft@dina.kvl.dk.">sestoft@dina.kvl.dk.</A>
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<A HREF="http://bugzilla.ximian.com/show_bug.cgi?id=46222">http://bugzilla.ximian.com/show_bug.cgi?id=46222</A>
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--- shadow/46222 Sun Jul 13 15:40:32 2003
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+++ shadow/46222.tmp.19879 Sun Jul 13 15:40:32 2003
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@@ -0,0 +1,91 @@
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+Bug#: 46222
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+Product: Mono/MCS
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+Version: unspecified
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+OS:
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+OS Details:
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+Status: NEW
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+Resolution:
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+Severity:
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+Priority: Normal
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+Component: Misc
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+AssignedTo: <A HREF="mailto:mono-bugs@ximian.com">mono-bugs@ximian.com</A>
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+ReportedBy: <A HREF="mailto:sestoft@dina.kvl.dk">sestoft@dina.kvl.dk</A>
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+QAContact: <A HREF="mailto:mono-bugs@ximian.com">mono-bugs@ximian.com</A>
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+TargetMilestone: ---
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+URL:
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+Cc:
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+Summary: Iterator (yield statement) implementation wrong
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+
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+Description of Problem:
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+
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+The implementation of the yield statement in C# 2 iterators refers to wrong
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+field of proxy class or enclosing class and therefore produces wrong
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+results. Apparently references to the b field from the enclosing class Seq
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+are somehow confused with the proxy-local field i, although I cannot see
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+from the disassembled bytecode exactly what goes wrong. If the iterator
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+uses only three (not four) fields from the enclosing class, everything is ok.
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+
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+Steps to reproduce the problem:
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+1. Compile and run this program with mcs -v2:
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+
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+using System;
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+using System.Collections;
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+
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+class Seq : IEnumerable {
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+ private readonly int m, n, k, b; // Represents the sequence b + k * [m..n]
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+
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+ public Seq(int m, int n, int k, int b) {
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+ this.m = m; this.n = n; this.k = k; this.b = b;
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+ }
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+
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+ public IEnumerator GetEnumerator() {
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+ for (int i=m; i<=n; i++) {
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+ Console.WriteLine("m={0} n={1} k={2} b={3} i={4}", m, n, k, b, i);
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+ yield b + k * i;
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+ }
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+ }
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+}
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+
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+class MyTest {
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+ public static void Main(String[] args) {
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+ Seq seq = new Seq(0, 4, 1, 0);
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+ foreach (int i in seq)
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+ Console.WriteLine(i);
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+ }
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+}
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+
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+
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+Actual Results:
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+
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+m=0 n=4 k=1 b=0 i=0
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+0
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+m=0 n=4 k=1 b=1 i=1
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+2
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+m=0 n=4 k=1 b=2 i=2
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+4
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+m=0 n=4 k=1 b=3 i=3
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+6
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+m=0 n=4 k=1 b=4 i=4
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+8
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+
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+
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+Expected Results:
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+
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+m=0 n=4 k=1 b=1 i=0
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+0
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+m=0 n=4 k=1 b=1 i=1
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+1
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+m=0 n=4 k=1 b=1 i=2
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+2
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+m=0 n=4 k=1 b=1 i=3
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+3
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+m=0 n=4 k=1 b=1 i=4
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+4
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+
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+
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+How often does this happen?
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+
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+Always on mono 0.25.
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+
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+
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+Additional Information:
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</PRE>
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