From: Andrew Cagney <cagney@redhat.com>
To: Mark Wielaard <mark@klomp.org>, Roland McGrath <roland@redhat.com>
Cc: Frysk Hackers <frysk@sourceware.org>
Subject: dl symbol search path; Was: Corefile -arch 32 test failures with breakpoint and stacktrace tests
Date: Tue, 09 Oct 2007 17:30:00 -0000 [thread overview]
Message-ID: <470BBA54.9060701@redhat.com> (raw)
In-Reply-To: <470BB52E.9010606@redhat.com>
Andrew Cagney wrote:
>
>>
>> + static Symbol get(Dwfl dwfl, String name)
>> + {
>> + Symbol sym = new Symbol();
>> + sym.name = name;
>> + DwflModule[] modules = dwfl.getModules();
>> + for (int i = 0; i < modules.length && ! sym.found; i++)
>> + modules[i].getSymbolByName(name, sym);
>> +
PS:
The rules for looking up an elf symbol is, unfortunately, subtle and
complex. A brute force search through all the modules taking the first
returned isn't correct. For instance, consider a search for open. If
the current symbol scope has a local open function then that should be
returned, and not the one from a library like glibc. The man page for
dlsym(3) touches on the semantics.
I was hoping that there was a dwfl method for doing this, but none jump
out from libdwfl.h? I see DwflModule.getSymbolByName does the best it
can using dwfl_module_getsymtab.
Andrew
next prev parent reply other threads:[~2007-10-09 17:30 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-06 8:12 Phil Muldoon
2007-10-08 10:46 ` Mark Wielaard
2007-10-09 17:08 ` Andrew Cagney
2007-10-09 17:30 ` Andrew Cagney [this message]
2007-10-16 2:39 ` dl symbol search path; Was: " Roland McGrath
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