GNU bug report logs - #18438
24.4.50; assertion failed in bidi.c

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From: aidalgol <at> amuri.net
To: <18438 <at> debbugs.gnu.org>
Cc: Eli Zaretskii <eliz <at> gnu.org>
Subject: bug#18438: 24.4.50; assertion failed in bidi.c
Date: Wed, 17 Sep 2014 10:42:18 +1200

On Tue, 16 Sep 2014 17:33:09 +0300, Eli Zaretskii wrote:
> If you don't mind messing with assembler, it would be interesting to
> disassemble bidi_check_type, see in which register it holds the value
> when it tests it, and then look at the actual value in that register
> in the bidi_check_type's call-stack frame.

Sure, but I'm not very familiar with x86 assembly, so I'll just post 
the entire disassemble output to start with and someone else will have 
to identify the register of interest.

Dump of assembler code for function bidi_check_type:
   0x00000001005010c3 <+0>:     push   %rbp
   0x00000001005010c4 <+1>:     mov    %rsp,%rbp
   0x00000001005010c7 <+4>:     sub    $0x20,%rsp
   0x00000001005010cb <+8>:     mov    %ecx,0x10(%rbp)
   0x00000001005010ce <+11>:    mov    0x58ab9b(%rip),%rax        # 
0x100a8bc70 <.refptr.suppress_checking>
   0x00000001005010d5 <+18>:    movzbl (%rax),%eax
   0x00000001005010d8 <+21>:    xor    $0x1,%eax
   0x00000001005010db <+24>:    test   %al,%al
   0x00000001005010dd <+26>:    je     0x1005010ff <bidi_check_type+60>
   0x00000001005010df <+28>:    cmpl   $0x17,0x10(%rbp)
   0x00000001005010e3 <+32>:    jbe    0x1005010ff <bidi_check_type+60>
   0x00000001005010e5 <+34>:    mov    $0x149,%r8d
   0x00000001005010eb <+40>:    lea    0x5599de(%rip),%rdx        # 
0x100a5aad0 <DEFAULT_REHASH_SIZE+56>
   0x00000001005010f2 <+47>:    lea    0x5599df(%rip),%rcx        # 
0x100a5aad8 <DEFAULT_REHASH_SIZE+64>
   0x00000001005010f9 <+54>:    callq  0x1005b9a15 <die>
=> 0x00000001005010fe <+59>:    nop
   0x00000001005010ff <+60>:    add    $0x20,%rsp
   0x0000000100501103 <+64>:    pop    %rbp
   0x0000000100501104 <+65>:    retq
End of assembler dump.

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