>
> here we have decl and its local alias:
> (gdb) p debug_tree (sect->named.decl)
> <var_decl 70f7d060 _ZTCSt14basic_ifstreamIcSt11char_traitsIcEE0_Si
> type <array_type 70dd8840
> type <pointer_type 700f5840 __vtbl_ptr_type type <function_type
> 700f57e0>
> unsigned SI
> size <integer_cst 70006498 constant 32>
> unit size <integer_cst 700064b0 constant 4>
> align 32 symtab 45 alias set 3 canonical type 700f5840
> pointer_to_this <pointer_type 700f5900>>
> BLK
> size <integer_cst 708002d0 constant 320>
> unit size <integer_cst 708000d8 constant 40>
> align 32 symtab 0 alias set 3 canonical type 70dd8840
> domain <integer_type 701a78a0 type <integer_type 7001d000 sizetype>
> type_6 SI size <integer_cst 70006498 32> unit size <integer_cst
> 700064b0 4>
> align 32 symtab 0 alias set -1 canonical type 701a78a0 precision
> 32 min <integer_cst 700064c8 0> max <integer_cst 701a5b88 9>>
> pointer_to_this <pointer_type 71272d80>>
> readonly addressable used public static tree_1 tree_5 tree_6 ignored weak
> in_system_header virtual decl_5 SI file
> /home/jh/trunk/c/powerpc-ibm-aix7.1.0.0/libstdc++-v3/include/fstream line 444
> col 11 size <integer_cst 708002d0 320> unit size <integer_cst 708000d8 40>
> user align 32 context <record_type 701eb000 basic_ifstream> initial
> <constructor 70f63680>
>
> (mem/u/c:SI (symbol_ref/i:SI
> ("_ZTCSt14basic_ifstreamIcSt11char_traitsIcEE0_Si") [flags 0x82] <var_decl
> 70f7d060 _ZTCSt14basic_ifstreamIcSt11char_traitsIcEE0_Si>) [3
> _ZTCSt14basic_ifstreamIcSt11char_traitsIcEE0_Si+0 S40 A32])>
> $6 = 10
> (gdb) p debug_tree (decl)
> <var_decl 714174e0
> _ZTCSt14basic_ifstreamIcSt11char_traitsIcEE0_Si.localalias.69
> type <array_type 70dd8840
> type <pointer_type 700f5840 __vtbl_ptr_type type <function_type
> 700f57e0>
> unsigned SI
> size <integer_cst 70006498 constant 32>
> unit size <integer_cst 700064b0 constant 4>
> align 32 symtab 45 alias set 3 canonical type 700f5840
> pointer_to_this <pointer_type 700f5900>>
> BLK
> size <integer_cst 708002d0 constant 320>
> unit size <integer_cst 708000d8 constant 40>
> align 32 symtab 0 alias set 3 canonical type 70dd8840
> domain <integer_type 701a78a0 type <integer_type 7001d000 sizetype>
> type_6 SI size <integer_cst 70006498 32> unit size <integer_cst
> 700064b0 4>
> align 32 symtab 0 alias set -1 canonical type 701a78a0 precision
> 32 min <integer_cst 700064c8 0> max <integer_cst 701a5b88 9>>
> pointer_to_this <pointer_type 71272d80>>
> readonly addressable used static tree_1 tree_5 tree_6 ignored
> in_system_header decl_5 SI file
> /home/jh/trunk/c/powerpc-ibm-aix7.1.0.0/libstdc++-v3/include/fstream line 444
> col 11 size <integer_cst 708002d0 320> unit size <integer_cst 708000d8 40>
> user align 32 context <record_type 701eb000 basic_ifstream>
> >
> $7 = 10
>
>
> Perhaps get_vairable_section should look for alias target, since that is the
> decl really deciding on the section? Richard?
This is patch that makes get_variable_section to look through the aliases
Index: varasm.c
===================================================================
--- varasm.c (revision 210914)
+++ varasm.c (working copy)
@@ -1083,6 +1083,9 @@
{
addr_space_t as = ADDR_SPACE_GENERIC;
int reloc;
+ symtab_node *snode = symtab_get_node (decl);
+ if (snode)
+ decl = symtab_alias_ultimate_target (snode)->decl;
if (TREE_TYPE (decl) != error_mark_node)
as = TYPE_ADDR_SPACE (TREE_TYPE (decl));
For AIX it makes the bug go away and I eventually get:
/tmp//ccyAATFr.s: line 30042: 1252-001
_ZTCSt14basic_ifstreamIcSt11char_traitsIcEE0_Si.localalias.69 is defined
already.
/tmp//ccyAATFr.s: line 30125: 1252-001
_ZTCSt14basic_ofstreamIcSt11char_traitsIcEE0_So.localalias.71 is defined
already.
/tmp//ccyAATFr.s: line 30164: 1252-001
_ZTCSt13basic_fstreamIcSt11char_traitsIcEE8_So.localalias.75 is defined already.
/tmp//ccyAATFr.s: line 30223: 1252-001
_ZTCSt13basic_fstreamIcSt11char_traitsIcEE0_Si.localalias.74 is defined already.
/tmp//ccyAATFr.s: line 30263: 1252-001
_ZTCSt14basic_ofstreamIwSt11char_traitsIwEE0_St13basic_ostreamIwS1_E.localalias.80
is defined already.
/tmp//ccyAATFr.s: line 30323: 1252-001
_ZTCSt13basic_fstreamIwSt11char_traitsIwEE8_St13basic_ostreamIwS1_E.localalias.84
is defined already.
/tmp//ccyAATFr.s: line 30388: 1252-001
_ZTCSt14basic_ifstreamIwSt11char_traitsIwEE0_St13basic_istreamIwS1_E.localalias.78
is defined already.
/tmp//ccyAATFr.s: line 30436: 1252-001
_ZTCSt13basic_fstreamIwSt11char_traitsIwEE0_St13basic_istreamIwS1_E.localalias.83
is defined already.
David, this looks like a bug in the AIX target output macros. I get:
.set
_ZTCSt14basic_ifstreamIcSt11char_traitsIcEE0_Si.localalias.69,_ZTCSt14basic_ifstreamIcSt11char_traitsIcEE0_Si
(this is correct since localalias is really an alias)
_ZTCSt14basic_ifstreamIcSt11char_traitsIcEE0_Si.localalias.69:
.space 40
_ZTCSt14basic_ifstreamIcSt11char_traitsIcEE0_Si:
...
This is wrong, since we should not try to out the variable at least if I read
AIX assembly correctly.
varpool has explicit test to not output any aliases, so perhaps this is a bug
in wrapup_globals
and AIX output macros. I will try to track more after my teaching tonight.
Honza
