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[Bug gas/6935] New: gas hangs when assembling g++ generated code


From: cayminfo-ec at yahoo dot com
Subject: [Bug gas/6935] New: gas hangs when assembling g++ generated code
Date: 2 Oct 2008 00:42:13 -0000

I compiled a C++ file with g++ and the compile hung and took up 100% of the CPU
when assembling the file.

The problem seems to have to do with an ".align" directive. If I comment the
".align" (which was generated by the compiler) out, it no longer hangs.
Additionally, if I manually add three ".byte 0" to pad before the alignment
directive, gas also no longer hangs.

I will try to post the entire ".s" file if I can. I can also email it to you on
request. The .s file is 4175620 bytes in size and the offending align directive
happens at about line 175141.

Here is a snippet of the end of the file with some comments that I have added.
This seems to be the ending part of a "gcc_except_table" section.

--------------- START SNIPPET ---------------
        .uleb128 .LEHB10374-.LFB3498
        .uleb128 .LEHE10374-.LEHB10374
        .uleb128 .L14870-.LFB3498
        .uleb128 0x0
        .uleb128 .LEHB10375-.LFB3498
        .uleb128 .LEHE10375-.LEHB10375
        .uleb128 0x0
        .uleb128 0x0
.LLSDACSE3498:
        .byte   0x0
        .byte   0x0
        .byte   0x1
        .byte   0x7d
        .byte   0x1
        .byte   0x7d

###############################################################################
# CM: The problem occurs here. Anything not commented was produced by g++.
#
# Assemble with "as -V -Qy --64 -o x.o x.s" and "as" hangs.
#
# TEST #1:
# I manually added the next three lines manually to check if alignment
# was the problem. Uncomment out the next three lines and "as" does not hang!
#       .byte   0x0
#       .byte   0x0
#       .byte   0x0
#
# TEST #2:
# If you comment out the following align (make sure to comment out
# the three manually added .byte in TEST #1) that was generated
# by the compiler, "as" does not hang, too!
        .align 4
        .long   DW.ref._ZTI11FmFleetings-.
.LLSDATT3498:

#
# Seems like a problem with alignment. The rest of this file has been
# chopped off as it is not relavent.
#
# System Information:
#
# Linux:
# cat /etc/redhat-release 
#   Red Hat Enterprise Linux Server release 5 (Tikanga)
#
# g++ --version 
#   g++ (GCC) 4.1.1 20070105 (Red Hat 4.1.1-52)
#   Copyright (C) 2006 Free Software Foundation, Inc.
#   This is free software; see the source for copying conditions.  There is NO
#   warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
#
# Version of "as":
#   GNU assembler version 2.17.50.0.6-2.el5 (x86_64-redhat-linux) using BFD
version 2.17.50.0.6-2.el5 20061020
#
# uname -a
#   Linux kendo 2.6.18-8.el5 #1 SMP Fri Jan 26 14:15:14 EST 2007 x86_64 x86_64
x86_64 GNU/Linux
#
# ldd `which as`
#         libbfd-2.17.50.0.6-2.el5.so => /usr/lib64/libbfd-2.17.50.0.6-2.el5.so
(0x00000030dae00000)
#         libc.so.6 => /lib64/libc.so.6 (0x00000030daa00000)
#         /lib64/ld-linux-x86-64.so.2 (0x00000030da600000)
#

--------------- END SNIPPET ---------------

-- 
           Summary: gas hangs when assembling g++ generated code
           Product: binutils
           Version: 2.17
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gas
        AssignedTo: unassigned at sources dot redhat dot com
        ReportedBy: cayminfo-ec at yahoo dot com
                CC: bug-binutils at gnu dot org
 GCC build triplet: x86_64-redhat-linux
  GCC host triplet: x86_64-redhat-linux
GCC target triplet: x86_64-redhat-linux


http://sourceware.org/bugzilla/show_bug.cgi?id=6935

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