[Issue 861] New: Using two typedefs of an undefined name in a class in a different module with import cycles causes DMD to hang

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January 20, 2007

[Issue 861] New: Using two typedefs of an undefined name in a class in a different module with import cycles causes DMD to hang

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http://d.puremagic.com/issues/show_bug.cgi?id=861

           Summary: Using two typedefs of an undefined name in a class in a
                    different module with import cycles causes DMD to hang
           Product: D
           Version: 1.00
          Platform: PC
        OS/Version: Windows
            Status: NEW
          Keywords: rejects-valid
          Severity: critical
          Priority: P2
         Component: DMD
        AssignedTo: bugzilla@digitalmars.com
        ReportedBy: deewiant@gmail.com


Like Issue 860, this bug is hard to summarize. Essentially, the problem is that compiling the definesType module, below, causes DMD to hang with 100% CPU usage.

--
module definesType;

import usesType; // import cycle

//alias int NONEXISTENT_NAME;
//typedef int NONEXISTENT_NAME;

typedef NONEXISTENT_NAME
        myTypedef,
        myTypedef2;
--
module usesType;

import definesType;

// must be class, not struct or template
class UsesTypedefs {
        // can be anything as long as both typedefs are used
        myTypedef usesTypedef;
        myTypedef2 usesTypedef2;
}
--

Uncommenting either the alias or the typedef (or even both) doesn't affect the
bug in any way (this may have something to do with Issue 860).


--

http://d.puremagic.com/issues/show_bug.cgi?id=861 bugzilla@digitalmars.com changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution| |WORKSFORME ------- Comment #1 from bugzilla@digitalmars.com 2007-01-31 15:00 ------- Works in DMD 1.004. --

http://d.puremagic.com/issues/show_bug.cgi?id=861 deewiant@gmail.com changed: What |Removed |Added ---------------------------------------------------------------------------- Status|RESOLVED |REOPENED Resolution|WORKSFORME | ------- Comment #2 from deewiant@gmail.com 2007-02-01 12:12 ------- Still fails for me with 1.004. "dmd -c definesType.d" leads to a DMD hang. Any idea of what could be causing it? With -v, dmd outputs the following before hanging: parse definesType semantic definesType import object import usesType --

http://d.puremagic.com/issues/show_bug.cgi?id=861 ------- Comment #3 from bugzilla@digitalmars.com 2007-02-01 13:07 ------- It doesn't hang when I try it. It works fine. Are you *sure* you're using 1.004? --

http://d.puremagic.com/issues/show_bug.cgi?id=861 ------- Comment #4 from digitalmars-com@baysmith.com 2007-02-01 17:17 ------- I can confirm that definesType.d hangs DMD 1.004 C:\>dmd -c definesType.d (Killed dmd.exe) C:\>dmd Digital Mars D Compiler v1.004 Copyright (c) 1999-2007 by Digital Mars written by Walter Bright Documentation: www.digitalmars.com/d/index.html (removed for brevity) --

http://d.puremagic.com/issues/show_bug.cgi?id=861 thomas-dloop@kuehne.cn changed: What |Removed |Added ---------------------------------------------------------------------------- OS/Version|Windows |All ------- Comment #5 from thomas-dloop@kuehne.cn 2007-02-15 03:42 ------- Added to DStress as http://dstress.kuehne.cn/nocompile/i/import_18_A.d http://dstress.kuehne.cn/nocompile/i/import_18_B.d http://dstress.kuehne.cn/nocompile/i/import_18_C.d http://dstress.kuehne.cn/nocompile/i/import_18_D.d --

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