[Bug c++/31950] New: ICE in tree-ssa-alias-warnings.c

[Bug c++/31950] New: ICE in tree-ssa-alias-warnings.c

[Ralf dot Wildenhues at gmx dot de]

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With mainline as of a couple of days ago:
| gcc version 4.3.0 20070514 (experimental)

g++ -O2 -Wstrict-aliasing=3 -c t.cc

gives me this error:
| t.cc: In function ‘int main()’:
| t.cc:11: internal compiler error: tree check: expected tree that contains
‘decl common’ structure, have ‘struct_field_tag’ in ffan_walker, at
tree-ssa-alias-warnings.c:638

on the following code.  I haven't tried eliminating <valarray> yet,
but may try to do so, given time.  Will try updated mainline next.

Cheers,
Ralf

#include <valarray>
using std::valarray;

struct A {
  valarray<double>* v;
  virtual ~A() { delete[] v; }
};

A Op(void);

int main()
{
  A a(Op());
  return 0;
}


-- 
           Summary: ICE in tree-ssa-alias-warnings.c
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: Ralf dot Wildenhues at gmx dot de
 GCC build triplet: x86_64-unknown-linux-gnu
  GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: x86_64-unknown-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31950

[Bug c++/31950] ICE in tree-ssa-alias-warnings.c

[Ralf dot Wildenhues at gmx dot de]

------- Comment #1 from Ralf dot Wildenhues at gmx dot de  2007-05-16 13:35 -------
Reduced test case.  Both tests also fail with current mainline (revision
124767M).

struct B {
  ~B();
};

struct A {
  B* b;
  virtual ~A() { delete[] b; }
};

A Op(void);

int main()
{
  A a(Op());
  return 0;
}


-- 

Ralf dot Wildenhues at gmx dot de changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |Ralf dot Wildenhues at gmx
                   |                            |dot de


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31950

[Bug middle-end/31950] [4.3 Regression] ICE in tree-ssa-alias-warnings.c

[rguenth at gcc dot gnu dot org]

------- Comment #2 from rguenth at gcc dot gnu dot org  2007-05-16 15:41 -------
Confirmed.

Index: tree-ssa-alias-warnings.c
===================================================================
--- tree-ssa-alias-warnings.c   (revision 124763)
+++ tree-ssa-alias-warnings.c   (working copy)
@@ -635,7 +635,7 @@ ffan_walker (tree *t,
              int *go_below ATTRIBUTE_UNUSED,
              void *data ATTRIBUTE_UNUSED)
 {
-  if (DECL_P (*t) && DECL_ARTIFICIAL (*t))
+  if (DECL_P (*t) && !MTAG_P (*t) && DECL_ARTIFICIAL (*t))
     return *t;
   else
     return NULL_TREE;


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rus at google dot com
             Status|UNCONFIRMED                 |NEW
          Component|c++                         |middle-end
     Ever Confirmed|0                           |1
           Keywords|                            |ice-on-valid-code
   Last reconfirmed|0000-00-00 00:00:00         |2007-05-16 15:41:36
               date|                            |
            Summary|ICE in tree-ssa-alias-      |[4.3 Regression] ICE in
                   |warnings.c                  |tree-ssa-alias-warnings.c
   Target Milestone|---                         |4.3.0


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31950

[Bug middle-end/31950] [4.3 Regression] ICE in tree-ssa-alias-warnings.c

[Ralf dot Wildenhues at gmx dot de]

------- Comment #3 from Ralf dot Wildenhues at gmx dot de  2007-05-16 16:07 -------
Your patch seems to fix the failure for both reduced test cases
as well as the original code.  Thanks for the prompt response!


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31950

[Bug middle-end/31950] [4.3 Regression] ICE in tree-ssa-alias-warnings.c

[tbm at cyrius dot com]

------- Comment #4 from tbm at cyrius dot com  2007-05-16 16:39 -------
CCing Richi in case he didn't see the comment saying that his patch works.


-- 

tbm at cyrius dot com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rguenth at gcc dot gnu dot
                   |                            |org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31950

[Bug middle-end/31950] [4.3 Regression] ICE in tree-ssa-alias-warnings.c

[rguenth at gcc dot gnu dot org]

------- Comment #5 from rguenth at gcc dot gnu dot org  2007-05-16 20:07 -------
*** Bug 31962 has been marked as a duplicate of this bug. ***


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dcb314 at hotmail dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31950

[Bug middle-end/31950] [4.3 Regression] ICE in tree-ssa-alias-warnings.c

[pinskia at gcc dot gnu dot org]

-- 

pinskia at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Severity|normal                      |major
  GCC build triplet|x86_64-unknown-linux-gnu    |
   GCC host triplet|x86_64-unknown-linux-gnu    |
 GCC target triplet|x86_64-unknown-linux-gnu    |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31950

[Bug middle-end/31950] [4.3 Regression] ICE in tree-ssa-alias-warnings.c

[rguenth at gcc dot gnu dot org]

------- Comment #6 from rguenth at gcc dot gnu dot org  2007-06-19 11:16 -------
Subject: Bug 31950

Author: rguenth
Date: Tue Jun 19 11:16:43 2007
New Revision: 125846

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=125846
Log:
2007-06-19  Richard Guenther  <rguenther@suse.de>

        PR middle-end/31950
        * tree-ssa-alias-warnings.c (ffan_walker): Punt on MTAGs.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/tree-ssa-alias-warnings.c


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31950

[Bug middle-end/31950] [4.3 Regression] ICE in tree-ssa-alias-warnings.c

[rguenth at gcc dot gnu dot org]

------- Comment #7 from rguenth at gcc dot gnu dot org  2007-06-19 11:17 -------
Fixed.


-- 

rguenth at gcc dot gnu dot org changed:

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


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31950