[Mono-bugs] [Bug 389138] New: C# compiler code fails when running under .NET Framework

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Sun May 11 04:53:02 EDT 2008


           Summary: C# compiler code fails when running under .NET Framework
           Product: Mono: Compilers
           Version: 1.9.0
          Platform: x86
        OS/Version: Windows Vista
            Status: NEW
          Severity: Major
          Priority: P5 - None
         Component: C#
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: mihailik at gmail.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: Other

support.cs, line 385

CharArrayHashtable.GetHash(object key)

throws an OverflowException when called from Tokenizer.InitTokens method with
parameters "abstract", Token.ABSTRACT (cs-tokenizer.cs line 303).

I am using the project **gmcs.csproj** to build the Mono C# compiler.

The cause of failure is overflow when calculating the hash. The simplest way to
fix is to add 'unchecked' keyword to line 385 of support.cs:

                protected override int GetHash (Object key)
                        char[] arr = (char[])key;
                        int h = 0;

                        for (int i = 0; i < len; ++i)
                                h = unchecked((h << 5) - h + arr [i]);

                        return h;

I think the difference between Microsoft's .NET and Mono here is the defaulting
to unchecked in Mono. Nevertheless, for a compatibility it should default to
same. But for a quick fix, explicit 'unchecked' keyword can be used to satisfy
both worlds.

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