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Re: namespace namespace
- From: Dave Korn <dave dot korn dot cygwin at googlemail dot com>
- To: Andrew Haley <aph at redhat dot com>
- Cc: Dave Korn <dave dot korn dot cygwin at googlemail dot com>, gcc-patches <gcc-patches at gcc dot gnu dot org>, Java Patch List <java-patches at gcc dot gnu dot org>
- Date: Tue, 30 Jun 2009 14:16:10 +0100
- Subject: Re: namespace namespace
- References: <4A3D95F1.email@example.com> <4A3E55E1.firstname.lastname@example.org> <4A403949.email@example.com> <4A40A09E.firstname.lastname@example.org> <9DAA724F-CC05-4A04-8B4D-386238D1D223@bluezoo.org> <email@example.com> <4A40B4A1.firstname.lastname@example.org> <4A40CD50.email@example.com> <4A40DBB9.firstname.lastname@example.org> <4A40E497.email@example.com> <4A4139C1.firstname.lastname@example.org> <4A41EF61.email@example.com> <4A421391.firstname.lastname@example.org> <4A48FC28.email@example.com> <4A49F80E.firstname.lastname@example.org> <4A4A07F5.email@example.com>
Andrew Haley wrote:
> Dave Korn wrote:
>> Andrew Haley wrote:
>>> This is an ABI change. However, the ABI was almost completely broken
>> Tangentially-related: Would it ever be possible to change the use of periods
>> as separators in java mangled names too, or is that too deeply entrenched or
>> part of a standard?
> I suppose it could be done. Is there some big problem with periods that
> I don't know about?
> For example, java.lang.Object.class is mangled as _ZN4java4lang6Object6class$E.
The kind of symbols I'm talking about are those with real actual periods in
them, things I've seen in libjava, such as these:
00000030 r _java.io.IOException_ref.1567
00000034 r _java.io.IOException_ref.3036
0000002c r _java.lang.Exception_ref.1841
or these (from unidentified .o files):
00000d10 t __ZN3gnu5javax5swing4text4html6parser7support3low4nodeC1Eib.clone.0
00000f72 r __Utf106.2066
00000fe0 r __Utf117.2121
000002f4 r __Utf17.1621
00003b54 r __Utf1042.35506
0000c696 r __Utf1757.124553
000001d4 r _CSWTCH.18597
000001d4 r _CSWTCH.18597
00000000 d ___emutls_v._ZL12method_cache
00000020 t __Z17JvNewStringLatin1PKc.clone.0
> When do you see a problem with the use of periods as separators?
Actually, there may not be a problem at all. There is a /potential/ problem
relating to the export of symbols from DLLS, specified using DEF files. The
syntax of DEF files uses periods as a separator in entries that forward an
export to another DLL, so having periods in the symbol names would cause
ambiguity in the grammar.
Like I said I've seen these mysterious symbols with literal periods in them,
but I don't know what they actually are. On closer inspection while writing
this mail, I suddenly notice that they all appear to be local symbols; if this
is always the case, then there's no problem at all because we'll never want to
export them from a DLL. And noticing the '.clone.' in there makes me wonder
if this is in fact an entirely C++ issue and not Java at all? (In which case
sorry for bothering you with something that's not your department!)