[patch] Accessing tls variables across files causes a bug

[Ulrich Weigand]

Jan Kratochvil wrote:

> > I'm not sure I understand this comment -- the translated address of
> > a thread-local variable obviously depends on the thread in which it
> > is evaluated, so how should a single location like SYMBOL_VALUE_ADDRESS
> > be able to hold that value for all threads?
> 
> SYMBOL_VALUE_ADDRESS is used many times across GDB code and I assumed in most
> of such cases it would be more appropriate to return the absolute address
> valid for current inferior_ptid.
>
> But I now briefly checked all these points and found out in fact all of them
> work with SYMBOL_VALUE_ADDRESS referring to function symbols - PC values (just
> except value_static_field() but that is also not in use with TLS symbols).
> Sure PC values are never TLS-translated.

Agreed.

> > In the LOC_COMPUTED case, we'd output something like "at offset ...
> > in the thread-local storage for ...".  For consistency reasons, I'd
> > prefer to have the same output in the LOC_UNDEFINED case as well.
> 
> While I copied the message from the LOC_COMPUTED case I agree it should be
> consistent and if I wish the absolute address there it should be printed even
> in the LOC_COMPUTED case which would be more a scope of a different patch.

OK, thanks.


> 2008-12-01  Jan Kratochvil  <jan.kratochvil@redhat.com>
> 
> 	Fix resolving external references to TLS variables.
> 	* findvar.c: Include `objfiles.h'.
> 	(read_var_value <LOC_UNRESOLVED>): New variable `obj_section'.  Handle
> 	SEC_THREAD_LOCAL variables.
> 	* printcmd.c (address_info <LOC_UNRESOLVED>): Handle SEC_THREAD_LOCAL
> 	variables.
> 
> 2008-12-01  Jan Kratochvil  <jan.kratochvil@redhat.com>
> 
> 	Test resolving external references to TLS variables.
> 	* gdb.threads/tls.exp: New tests to examine A_THREAD_LOCAL and
> 	FILE2_THREAD_LOCAL.
> 	(testfile2, srcfile2): New variables.
> 	* gdb.threads/tls.c (file2_thread_local)
> 	(function_referencing_file2_thread_local): New.
> 	* gdb.threads/tls2.c: New file.

This is OK.

Thanks,
Ulrich

-- 
  Dr. Ulrich Weigand
  GNU Toolchain for Linux on System z and Cell BE
  Ulrich.Weigand@de.ibm.com