[Bug tree-optimization/52095] New: [4.7 regression] ICE compiling gcc.dg/sms-7.c: SEGV in fprintf

["ro at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52095

             Bug #: 52095
           Summary: [4.7 regression] ICE compiling gcc.dg/sms-7.c: SEGV in
                    fprintf
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: ro@gcc.gnu.org
              Host: i386-pc-solaris2.10
            Target: i386-pc-solaris2.10
             Build: i386-pc-solaris2.10


Since 20111213, gcc.dg/sms-7.c FAILs on Solaris 10/x86, both 32 and 64-bit:

FAIL: gcc.dg/sms-7.c (internal compiler error)
FAIL: gcc.dg/sms-7.c (test for excess errors)
WARNING: gcc.dg/sms-7.c compilation failed to produce executable

Running cc1

$ cc1 -fpreprocessed sms-7.i -quiet -mtune=generic -march=pentium4 -O3
-fmodulo-sched -fstrict-aliasing -fdump-rtl-sms -fmodulo-sched-allow-regmoves
--param sms-min-sc=1 -o sms-7.s

gives:

/vol/gcc/src/hg/trunk/local/gcc/testsuite/gcc.dg/sms-7.c: In function 'main':
/vol/gcc/src/hg/trunk/local/gcc/testsuite/gcc.dg/sms-7.c:45:1: internal
compiler error: Segmentation Fault

With gdb, I find:

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 1 (LWP 1)]
0xfee063dc in strlen () from /lib/libc.so.1
(gdb) where
#0  0xfee063dc in strlen () from /lib/libc.so.1
#1  0xfee6169a in _ndoprnt () from /lib/libc.so.1
#2  0xfee64229 in fprintf () from /lib/libc.so.1
#3  0x088689b0 in sms_schedule ()
    at /vol/gcc/src/hg/trunk/local/gcc/modulo-sched.c:1414
#4  rest_of_handle_sms ()
    at /vol/gcc/src/hg/trunk/local/gcc/modulo-sched.c:3338
#5  0x083bb744 in execute_one_pass (pass=pass@entry=0x8d82be0)
    at /vol/gcc/src/hg/trunk/local/gcc/passes.c:2081
#6  0x083bba9d in execute_pass_list (pass=0x8d82be0)
    at /vol/gcc/src/hg/trunk/local/gcc/passes.c:2136
#7  0x083bbab0 in execute_pass_list (pass=0x8d7f0a0)
    at /vol/gcc/src/hg/trunk/local/gcc/passes.c:2137
#8  0x08497e86 in tree_rest_of_compilation (fndecl=0xfeaaa780)
    at /vol/gcc/src/hg/trunk/local/gcc/tree-optimize.c:422
#9  0x0822ff07 in cgraph_expand_function (node=0xfea0e47c)
    at /vol/gcc/src/hg/trunk/local/gcc/cgraphunit.c:1819
#10 0x08231795 in cgraph_expand_all_functions ()
    at /vol/gcc/src/hg/trunk/local/gcc/cgraphunit.c:1886
#11 cgraph_optimize () at /vol/gcc/src/hg/trunk/local/gcc/cgraphunit.c:2200
#12 0x08231cbf in cgraph_finalize_compilation_unit ()
    at /vol/gcc/src/hg/trunk/local/gcc/cgraphunit.c:1328
#13 0x0816dc1c in c_write_global_declarations ()
    at /vol/gcc/src/hg/trunk/local/gcc/c-decl.c:10030
#14 0x0845241b in compile_file ()
    at /vol/gcc/src/hg/trunk/local/gcc/toplev.c:573
#15 do_compile () at /vol/gcc/src/hg/trunk/local/gcc/toplev.c:1938
#16 toplev_main (argc=15, argv=0x80474c0)
    at /vol/gcc/src/hg/trunk/local/gcc/toplev.c:2014
#17 0x08af940b in main (argc=15, argv=0x80474c0)
    at /vol/gcc/src/hg/trunk/local/gcc/main.c:36

It turns out that sms_schedule calls fprintf with a NULL ptr since
insn_file(insn) is NULL at this point.

This is a regression from 4.6.

  Rainer