[Mono-bugs] [Bug 479506] New: Out of range exceptions with object initializers

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Wed Feb 25 07:43:49 EST 2009


           Summary: Out of range exceptions with object initializers
    Classification: Mono
           Product: Mono: Compilers
           Version: 2.2.x
          Platform: x86-64
        OS/Version: Linux
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: C#
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: stapostol at gmail.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---

Created an attachment (id=275328)
 --> (https://bugzilla.novell.com/attachment.cgi?id=275328)
Simple project that reproduces the issue.

User-Agent:       Opera/9.63 (X11; Linux x86_64; U; el) Presto/2.1.1

The easiest way to describe the problem is with a source snippet:

struct Vector2 { public float X, Y; }
struct Vertex { public Vector2 Position; }

int i = 0;
Vertex[] data = new Vertex[1];
data[i++] = new Vertex() { Position = new Vector2() };

The last line causes "i" to be incremented *twice*, once before the assignment
takes places and once after, which results in an out of range exception.

Adding more fields to the structures causes "i" to be incremented more times. I
haven't been able to reproduce this with simple types (e.g. using float X, Y
instead of Vector2 in Vertex). The csc compiler does not suffer from this

I have attached a simple test case.

Any chance this can be fixed before 2.4 is released?

Reproducible: Always

Steps to Reproduce:
1. Compile and run the attached test case with gmcs - OutOfRangeException.
2. Compile and run the attached test case with csc - works.

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