How to use test-nlist

[Mark Wielaard]

On Fri, May 24, 2019 at 11:00:57AM +0800, Yu, Mingli wrote:
> On 2019年05月23日 19:50, Mark Wielaard wrote:
> > > # ./tests/test-nlist
> > > nlist failed
> > 
> > You are supposed to run it with make check.
> > make check TESTS=test-nlist
> > 
> > test-nlist tries to run nlist on itself.
> > So it has to be in the current working directory.
> 
> Thanks Mark for your respond!
> As you said "So it has to be in the current working directory.", what do you
> mean? test-nlist needs to locate in the current working directory?

Yes. See the source code.
The test tries to run nlist on "./test-nlist".

> > Basically nlist fills in the n_value and n_scnum with the st_value and
> > st_shndx of the symbol named if found.
> > 
> > As you can see for me it corresponds to the values found by:
> > 
> > $ eu-readelf -s ./test-nlist | egrep ' (var|bss|main|foo)'
> >     58: 0000000000004048      4 OBJECT  GLOBAL DEFAULT       24 var
> >     61: 0000000000004050      4 OBJECT  GLOBAL DEFAULT       25 bss
> >     66: 0000000000001310      3 FUNC    GLOBAL DEFAULT       14 foo
> >     71: 0000000000001080    408 FUNC    GLOBAL DEFAULT       14 main
> 
> # which eu-readelf
> /usr/bin/eu-readelf
> 
> # /usr/bin/eu-readelf -s tests/test-nlist
> Symbol table [ 5] '.dynsym' contains 11 entries:
>  1 local symbol  String table: [ 6] '.dynstr'
>   Num:            Value   Size Type    Bind   Vis          Ndx Name
>     0: 0000000000000000      0 NOTYPE  LOCAL  DEFAULT    UNDEF
>     1: 0000000000000000      0 NOTYPE  WEAK   DEFAULT    UNDEF
> _ITM_deregisterTMCloneTable
>     2: 0000000000000000      0 FUNC    GLOBAL DEFAULT    UNDEF
> puts@GLIBC_2.2.5 (2)
>     3: 0000000000000000      0 FUNC    GLOBAL DEFAULT    UNDEF
> __stack_chk_fail@GLIBC_2.4 (3)
>     4: 0000000000000000      0 FUNC    GLOBAL DEFAULT    UNDEF
> __libc_start_main@GLIBC_2.2.5 (2)
>     5: 0000000000000000      0 NOTYPE  WEAK   DEFAULT    UNDEF
> __gmon_start__
>     6: 0000000000000000      0 FUNC    GLOBAL DEFAULT    UNDEF
> nlist@ELFUTILS_1.0 (4)
>     7: 0000000000000000      0 FUNC    GLOBAL DEFAULT    UNDEF
> __printf_chk@GLIBC_2.3.4 (5)
>     8: 0000000000000000      0 FUNC    GLOBAL DEFAULT    UNDEF
> exit@GLIBC_2.2.5 (2)
>     9: 0000000000000000      0 NOTYPE  WEAK   DEFAULT    UNDEF
> _ITM_registerTMCloneTable
>    10: 0000000000000000      0 FUNC    WEAK   DEFAULT    UNDEF
> __cxa_finalize@GLIBC_2.2.5 (2)

For some reason your test-nlist doesn't have an .symtab.
Make sure that when you build the tests CLFAGS contains -g.
And the that test binary isn't accidentially stripped afterwards.

Cheers,

Mark