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Date: Tue, 09 Oct 2007 17:30:00 -0000
From: Andrew Cagney <cagney@redhat.com>
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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
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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