[Bug lto/40765] New: [LTO] ICE verify_ssa failed

[Bug lto/40765] New: [LTO] ICE verify_ssa failed

[rmansfield at qnx dot com]

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ryan@ryan:~/gcc/lto/x86-build/gcc$ ./xgcc -v
Using built-in specs.
COLLECT_GCC=./xgcc
Target: i686-pc-linux-gnu
Configured with: ../configure --enable-languages=c --enable-lto
--disable-bootstrap
Thread model: posix
gcc version 4.5.0 20090714 (experimental) [lto revision 149644] (lto merged
with rev 149625)
ryan@ryan:~/gcc/lto/x86-build/gcc$ ./xgcc -B. getconf.i -flto -c -O
ryan@ryan:~/gcc/lto/x86-build/gcc$ ./xgcc -B. confvar.i -flto -c -O
ryan@ryan:~/gcc/lto/x86-build/gcc$ ./xgcc -B. getconf.o confvar.o -flto -shared
In function âmainâ:
lto1: error: address taken, but ADDRESSABLE bit not set
PHI argument
&table[0];
for PHI node
p_93 = PHI <&table[0](19), &table[0](20)>
lto1: internal compiler error: verify_ssa failed
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.
lto-wrapper: ././xgcc returned 1 exit status
collect2: lto-wrapper returned 1 exit status


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           Summary: [LTO] ICE verify_ssa failed
           Product: gcc
           Version: lto
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: rmansfield at qnx dot com
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40765

[Bug lto/40765] [LTO] ICE verify_ssa failed

[rmansfield at qnx dot com]

------- Comment #1 from rmansfield at qnx dot com  2009-07-15 11:44 -------
Created an attachment (id=18201)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=18201&action=view)
preprocessed source


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40765

[Bug lto/40765] [LTO] ICE verify_ssa failed

[rguenth at gcc dot gnu dot org]

------- Comment #2 from rguenth at gcc dot gnu dot org  2009-07-15 15:15 -------
Confirmed.  Maybe as well LTO unrelated.


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rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2009-07-15 15:15:34
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40765

[Bug lto/40765] [LTO] ICE verify_ssa failed

[rguenth at gcc dot gnu dot org]

------- Comment #3 from rguenth at gcc dot gnu dot org  2009-07-17 15:40 -------
confvar.i:

struct variable {
    const char *string;
};
struct variable table[] = { };


getconf.i:

struct variable {
    const char *string;
};
extern struct variable table[];
int main(int argc, char *argv[]) 
{
    struct variable *p;
    for(p = table; p->string; p++) 
      ;
}

> ./xgcc -B.  confvar.3.i getconf.3.i -flto -O
In function 'main':
lto1: error: address taken, but ADDRESSABLE bit not set
PHI argument
&table[0];
for PHI node
p_1 = PHI <&table[0](2), p_4(3)>
lto1: internal compiler error: verify_ssa failed
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

as table is a global variable this is likely just a verifier issue - the
TREE_ADDRESSABLE state of non-static variables is not relevant (still it
seems it's not properly merged).  With -fwhole-program table should be
promoted to static, thus TREE_ADDRESSABLE should be merged here.

Like the following, which fixes the testcase:

Index: lto-symtab.c
===================================================================
--- lto-symtab.c        (revision 149739)
+++ lto-symtab.c        (working copy)
@@ -572,6 +572,9 @@ lto_symtab_merge_decl (tree new_decl,
   if (!lto_symtab_compatible (old_decl, new_decl))
     return;

+  /* Merge decl state.  */
+  TREE_ADDRESSABLE (old_decl) |= TREE_ADDRESSABLE (new_decl);
+
   old_resolution = lto_symtab_get_resolution (old_decl);
   gcc_assert (resolution != LDPR_UNKNOWN
              && resolution != LDPR_UNDEF


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rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |rguenth at gcc dot gnu dot
                   |dot org                     |org
             Status|NEW                         |ASSIGNED
   Last reconfirmed|2009-07-15 15:15:34         |2009-07-17 15:40:25
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40765

[Bug lto/40765] [LTO] ICE verify_ssa failed

[rguenth at gcc dot gnu dot org]

------- Comment #4 from rguenth at gcc dot gnu dot org  2009-07-17 17:41 -------
Subject: Bug 40765

Author: rguenth
Date: Fri Jul 17 17:41:38 2009
New Revision: 149753

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=149753
Log:
2009-07-17  Richard Guenther  <rguenther@suse.de>

        PR lto/40765
        * lto-symtab.c (lto_symtab_merge_decl): Merge TREE_ADDRESSABLE
        state.

        * gcc.dg/lto/20090717_0.c: New testcase.
        * gcc.dg/lto/20090717_1.c: Likewise.

Added:
    branches/lto/gcc/testsuite/gcc.dg/lto/20090717_0.c
    branches/lto/gcc/testsuite/gcc.dg/lto/20090717_1.c
Modified:
    branches/lto/gcc/ChangeLog.lto
    branches/lto/gcc/lto-symtab.c
    branches/lto/gcc/testsuite/ChangeLog.lto


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40765

[Bug lto/40765] [LTO] ICE verify_ssa failed

[rguenth at gcc dot gnu dot org]

------- Comment #5 from rguenth at gcc dot gnu dot org  2009-07-17 17:42 -------
Fixed.


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rguenth at gcc dot gnu dot org changed:

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40765