[Bug libstdc++/41058] FAIL: ext/pb_ds/regression/hash_data_map_rand.cc

[ubizjak at gmail dot com]

------- Comment #22 from ubizjak at gmail dot com  2009-08-31 16:56 -------
Digging deeper, it smells like a linker error, at least on alpha (please note
that I used -static for final linking to ease debugging a bit):

FDE that corresponds to
_ZN10__gnu_pbds6detail15gp_ht_map_data_INS_4test10basic_typeES3_NS2_4hashESt8equal_toIS3_EN9__gnu_cxx15throw_allocatorIS3_EELb0ENS2_27direct_mod_range_hashing_t_IS9_EENS2_21quadratic_probe_fn_t_IS3_S9_EENS_27hash_standard_resize_policyINS2_25hash_prime_size_policy_t_ENS2_33hash_load_check_resize_trigger_t_IS9_Lm1ELm8ELm1ELm2ELb1EEELb1EmEEEC2ERKSJ_

is defined as:

$LSFDE1017:
        .4byte  $LEFDE1017-$LASFDE1017
$LASFDE1017:
        .4byte  $LASFDE1017-$Lframe1
        .4byte  $LFB5855-.
        .4byte  $LFE5855-$LFB5855
        .uleb128 0x4
>>      .4byte  $LLSDA5855-.
        .byte   0x4
        .4byte  $LCFI1142-$LFB5855
        .byte   0xe
        .uleb128 0x40
        .byte   0x4

and corresponding LSDA:

$LLSDA5855:
        .byte   0xff
        .byte   0x9b
        .uleb128 $LLSDATT5855-$LLSDATTD5855
$LLSDATTD5855:
        .byte   0x1
        .uleb128 $LLSDACSE5855-$LLSDACSB5855
$LLSDACSB5855:
        .uleb128 $LEHB373-$LFB5855
        .uleb128 $LEHE373-$LEHB373
        .uleb128 $L2169-$LFB5855
        .uleb128 0x0

Now, liker links LSDA into FDE as:

(gdb) x/32cx fde
0x12019e770:    0x34    0x00    0x00    0x00    0xf4    0x1a    0x00    0x00
0x12019e778:    0xc8    0x11    0xe7    0xff    0x88    0x02    0x00    0x00
0x12019e780:    0x04    0x84    0xcc    0x01    0x00    0x50    0x0e    0x40
0x12019e788:    0x58    0x8e    0x02    0x8b    0x05    0x89    0x07    0x58

So, linker puts 0x0001cc84 at PC 0x12019e781.

Adding both together (as marked by ">>" above), we get 0x1201bb405.

This value is wrong, LSDA is located at 0x1201bb3f4 (see comment #21).

So, linker is perhaps creating address, relative to start of FDE instead of
current address.


-- 

ubizjak at gmail dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41058