Re: ICE in cpp with

[Andreas Jaeger <aj at arthur dot inka dot de>]

>>>>> Neil Booth writes:

Hi Neil,

thanks for your answer.
 > Hi Andreas,
 > I'd like to help you fix this - it's my code - but I can't reproduce
 > it with that input on my Linux box.  Could you trim the command line
 > as short as possible, maybe to just the -A asserts, so that it still
 > happens.  Then send me the command line.

 > Alternatively, if you could tell me which line in _cpp_parse_assertion
 > it's failing on, and the contents of some variables at that point
 > (e.g. token) it would help a *lot*.  (so at least we know which -A
 > option it's barfing on).

The first problem I have is that running from the commandline doesn't work:

$ ./cpp -lang-c -v -iprefix ./../lib/gcc-lib/mipsel-unknown-linux-gnu/2.96/ -isystem ./include -isystem /opt/gcc-2.96/mipsel-unknown-linux-gnu/bin/include -D__GNUC__=2 -D__GNUC_MINOR__=96 -D__GNUC_PATCHLEVEL__=0 -DMIPSEL -D_MIPSEL -Dunix -Dmips -D_mips -DR3000 -D_R3000 -Dlinux -D__ELF__ -D__PIC__ -D__pic__ -D__MIPSEL__ -D_MIPSEL -D__unix__ -D__mips__ -D__mips__ -D__R3000__ -D_R3000 -D__linux__ -D__ELF__ -D__PIC__ -D__pic__ -D__MIPSEL -D__unix -D__mips -D__mips -D__R3000 -D__linux -Asystem\(posix\) -Acpu\(mips\) -Amachine\(mips\) -D__LANGUAGE_C -D_LANGUAGE_C -DLANGUAGE_C -D__SIZE_TYPE__=unsigned int -D__PTRDIFF_TYPE__=int -D_MIPS_FPSET=32 -D_MIPS_ISA=_MIPS_ISA_MIPS3 -D_ABIN32=2 -D_MIPS_SIM=_ABIN32 -D_MIPS_SZINT=32 -D_MIPS_SZLONG=32 -D_MIPS_SZPTR=32 -U__mips -D__mips -U__mips64 -isystem /opt/gcc-2.96/mipsel-unknown-linux-gnu/include tmp-dum.c /tmp/ccdgD2mr.i
GNU CPP version 2.96 20000704 (experimental) (cpplib)
 (MIPSel GNU/ELF)
ignoring nonexistent directory "/opt/gcc-2.96/mipsel-unknown-linux-gnu/bin/include"
cpp: Too many arguments. Type cpp --help for usage info


Ok, trimming the command line helps to reproduce this:

(gdb) r -lang-c -v -iprefix ./../lib/gcc-lib/mipsel-unknown-linux-gnu/2.96/ -isystem ./include -isystem /opt/gcc-2.96/mipsel-unknown-linux-gnu/bin/include -Asystem\(posix\) -Acpu\(mips\) -Amachine\(mips\) -D__LANGUAGE_C -D_LANGUAGE_C -DLANGUAGE_C -isystem /opt/gcc-2.96/mipsel-unknown-linux-gnu/include tmp-dum.c /tmp/ccdgD2mr.i
Starting program: /home/sites/home/users/aj/builds/gcc/gcc/./cpp -lang-c -v -iprefix ./../lib/gcc-lib/mipsel-unknown-linux-gnu/2.96/ -isystem ./include -isystem /opt/gcc-2.96/mipsel-unknown-linux-gnu/bin/include -Asystem\(posix\) -Acpu\(mips\) -Amachine\(mips\) -D__LANGUAGE_C -D_LANGUAGE_C -DLANGUAGE_C -isystem /opt/gcc-2.96/mipsel-unknown-linux-gnu/include tmp-dum.c /tmp/ccdgD2mr.i
Breakpoint 1 at 0x2aae10d4: file exit.c, line 40.
GNU CPP version 2.96 20000704 (experimental) (cpplib)
 (MIPSel GNU/ELF)
ignoring nonexistent directory "/opt/gcc-2.96/mipsel-unknown-linux-gnu/bin/include"
ignoring nonexistent directory "../lib/gcc-lib/mipsel-unknown-linux-gnu/2.96/include"
ignoring nonexistent directory "../mipsel-unknown-linux-gnu/include"
ignoring nonexistent directory "/usr/local/include"
ignoring duplicate directory "/opt/gcc-2.96/mipsel-unknown-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 include
 /opt/gcc-2.96/mipsel-unknown-linux-gnu/include
 /opt/gcc-2.96/lib/gcc-lib/mipsel-unknown-linux-gnu/2.96/include
 /usr/include
End of search list.

Program received signal SIGSEGV, Segmentation fault.
warning: Hit heuristic-fence-post without finding
warning: enclosing function for address 0x282ab138
This warning occurs if you are debugging a function without any symbols
(for example, in a stripped executable).  In that case, you may wish to
increase the size of the search with the `set heuristic-fence-post' command.

Otherwise, you told GDB there was a function where there isn't one, or
(more likely) you have encountered a bug in GDB.
0x282ab138 in ?? ()
(gdb) bt
#0  0x282ab138 in ?? ()
#1  0x41535c in _cpp_parse_assertion (pfile=0x10032a40, answerp=0x7ffffb40) at /home/sites/home/users/aj/cvs/gcc/gcc/cpplib.c:1331
#2  0x4154b8 in do_assert (pfile=0x10032a40) at /home/sites/home/users/aj/cvs/gcc/gcc/cpplib.c:1364
#3  0x41121c in _cpp_run_directive (pfile=0x10032a40, dir=0x10032580, buf=0x8 <Address 0x8 out of bounds>, count=3) at /home/sites/home/users/aj/cvs/gcc/gcc/cpplex.c:3352
#4  0x4159f4 in cpp_assert (pfile=0x10032a40, str=0x7ffffe0b "machine(mips)") at /home/sites/home/users/aj/cvs/gcc/gcc/cpplib.c:1487
#5  0x408dd8 in cpp_start_read (pfile=0x10032a40, print=0x10032b50, fname=0x7ffffe7b "tmp-dum.c") at /home/sites/home/users/aj/cvs/gcc/gcc/cppinit.c:966
#6  0x406a04 in main (argc=19, argv=0x10032b50) at /home/sites/home/users/aj/cvs/gcc/gcc/cppmain.c:73
(gdb) up
#1  0x41535c in _cpp_parse_assertion (pfile=0x10032a40, answerp=0x7ffffb40) at /home/sites/home/users/aj/cvs/gcc/gcc/cpplib.c:1331
1331      return cpp_lookup (pfile, sym, len);
(gdb) p pfile
$1 = (cpp_reader *) 0x10032a40
(gdb) p sym
$2 = (U_CHAR *) 0x7ffffae0 "#machinem¦\003\020xøÿ\177`\202\003\0208X\003\020@*\003\020@*\003\020ÿÿÿÿ{þÿ\177\001"
(gdb) p token
$3 = (cpp_token *) 0x7ffffae0
(gdb) p *token
$4 = {line = 1667329315, col = 26984, type = 110, flags = 101 'e', val = {integer = 9179861474720589421, name = {len = 268674669, 
      text = 0x7ffff878 "\004§¸\017 \221¸\017Ķ¶\017Àøÿ\177ø¶¶\017ð\020¶\017@p¼*"}, aux = 268674669}}
(gdb) p *pfile
$5 = {printer = 0x10032b50, buffer = 0x10032ce8, token_buffer = 0x10032b70 "/usr/share/locale", token_buffer_size = 200, limit = 0x10032b70 "/usr/share/locale", errors = 0, 
  multiline_string_line = 0, multiline_string_column = 0, system_include_depth = 0, buffer_stack_depth = 2, include_depth = 1, hashtab = 0x10033ca0, 
  all_include_files = 0x100354c8, actual_dirs = 0x10036f68, max_include_len = 63, potential_control_macro = 0x0, col_adjust = 0, token_list = {tokens = 0x10035838, 
    tokens_used = 5, tokens_cap = 256, namebuf = 0x10036840 "machinemips)__int\nJMP__1\n(experimental)\"", name_used = 11, name_cap = 1024, directive = 0x0, file = 0x0, 
    line = 0, params_len = 0, paramc = 0, flags = 5}, temp_tokens = 0x0, temp_cap = 0, temp_alloced = 0, temp_used = 0, date = 0x0, time = 0x0, 
  first_directive_token = 0x10035838, context_cap = 20, cur_context = 0, no_expand_level = 0, paste_level = 0, contexts = 0x10035690, args = 0x0, deps = 0x0, 
  hash_ob = 0x100344a8, buffer_ob = 0x10032c80, opts = {in_fname = 0x7ffffe7b "tmp-dum.c", out_fname = 0x7ffffe85 "/tmp/ccdgD2mr.i", tabstop = 8, pending = 0x10032c40, 
    deps_file = 0x0, deps_target = 0x0, quote_include = 0x100354f0, bracket_include = 0x100354f0, map_list = 0x0, 
    include_prefix = 0x7ffffd6e "./../lib/gcc-lib/mipsel-unknown-linux-gnu/2.96/", include_prefix_len = 47, verbose = 1 '\001', cplusplus = 0 '\000', 
    cplusplus_comments = 1 '\001', objc = 0 '\000', lang_asm = 0 '\000', lang_fortran = 0 '\000', chill = 0 '\000', discard_comments = 1 '\001', trigraphs = 0 '\000', 
    print_deps = 0 '\000', print_deps_missing_files = 0 '\000', print_deps_append = 0 '\000', print_include_names = 0 '\000', pedantic_errors = 0 '\000', 
    inhibit_warnings = 0 '\000', inhibit_errors = 0 '\000', warn_comments = 0 '\000', warn_trigraphs = 0 '\000', warn_import = 1 '\001', warn_traditional = 0 '\000', 
    warn_paste = 1 '\001', warnings_are_errors = 0 '\000', no_output = 0 '\000', remap = 0 '\000', no_line_commands = 0 '\000', ignore_srcdir = 0 '\000', 
    dollars_in_ident = 1 '\001', traditional = 0 '\000', warn_undef = 0 '\000', c89 = 0 '\000', c99 = 1 '\001', pedantic = 0 '\000', preprocessed = 0 '\000', 
    no_standard_includes = 0 '\000', no_standard_cplusplus_includes = 0 '\000', dump_macros = 0 '\000', debug_output = 0 '\000', dump_includes = 0 '\000', 
    show_column = 1 '\001'}, input_stack_listing_current = 0 '\000', no_macro_expand = 0 '\000', import_warning = 0 '\000', done_initializing = 0 '\000', skipping = 0 '\000', 
  save_parameter_spellings = 0 '\000', in_lex_line = 0 '\000', need_newline = 0 '\000'}
(gdb) p len
$6 = 8
(gdb) up
#2  0x4154b8 in do_assert (pfile=0x10032a40) at /home/sites/home/users/aj/cvs/gcc/gcc/cpplib.c:1364
1364      node = _cpp_parse_assertion (pfile, &new_answer);
(gdb) p new_answer
$7 = (struct answer *) 0x10038260
(gdb) p *new_answer
$8 = {next = 0x2abba95c, list = {tokens = 0x10038298, tokens_used = 1, tokens_cap = 1, namebuf = 0x10035568 "mipsd©»*\020", name_used = 4, name_cap = 4, directive = 0x0, 
    file = 0x0, line = 0, params_len = 0, paramc = 0, flags = 0}}
(gdb) up
#3  0x41121c in _cpp_run_directive (pfile=0x10032a40, dir=0x10032580, buf=0x8 <Address 0x8 out of bounds>, count=3) at /home/sites/home/users/aj/cvs/gcc/gcc/cpplex.c:3352
3352          (void) (*dir->handler) (pfile);
(gdb) up   
#4  0x4159f4 in cpp_assert (pfile=0x10032a40, str=0x7ffffe0b "machine(mips)") at /home/sites/home/users/aj/cvs/gcc/gcc/cpplib.c:1487
1487      _cpp_run_directive (pfile, &dtable[T_ASSERT], str, strlen (str));
(gdb) p str
$9 = 0x7ffffe0b "machine(mips)"


Further reducing the command line to (just with -Amachine(mips):
Starting program: /home/sites/home/users/aj/builds/gcc/gcc/./cpp -lang-c -v -iprefix ./../lib/gcc-lib/mipsel-unknown-linux-gnu/2.96/ -isystem ./include -isystem /opt/gcc-2.96/mipsel-unknown-linux-gnu/bin/include  -Amachine\(mips\) -D__LANGUAGE_C -D_LANGUAGE_C -DLANGUAGE_C -isystem /opt/gcc-2.96/mipsel-unknown-linux-gnu/include tmp-dum.c /tmp/ccdgD2mr.i

gives the same segmentation fault.

Is the output helpful for you?  Do you need any further information?

Andreas
-- 
 Andreas Jaeger
  SuSE Labs aj@suse.de
   private aj@arthur.inka.de