[Bug c++/50608] New: cannot apply 'offsetof' to a non constant address

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* [Bug c++/50608] New: cannot apply 'offsetof' to a non constant address
@ 2011-10-03 23:41 dberger at oubliette dot org
  2011-10-03 23:42 ` [Bug c++/50608] " dberger at oubliette dot org
                   ` (10 more replies)
  0 siblings, 11 replies; 12+ messages in thread
From: dberger at oubliette dot org @ 2011-10-03 23:41 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50608

             Bug #: 50608
           Summary: cannot apply 'offsetof' to a non constant address
    Classification: Unclassified
           Product: gcc
           Version: 4.6.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: dberger@oubliette.org


$ cat repro.ii

struct A {
    int offset;
};

struct B: public A {
};

struct C {
    A a;
    B b;
};

/* error: cannot apply 'offsetof' to a non constant address */
int fails = __builtin_offsetof (C, b.offset);

int works = (int)(&(((C*)0)->b.offset));

$

looks like a dup of Bug 13648, which claims to be fixed.


^ permalink raw reply	[flat|nested] 12+ messages in thread

* [Bug c++/50608] cannot apply 'offsetof' to a non constant address
  2011-10-03 23:41 [Bug c++/50608] New: cannot apply 'offsetof' to a non constant address dberger at oubliette dot org
@ 2011-10-03 23:42 ` dberger at oubliette dot org
  2011-10-04  9:34 ` [Bug c++/50608] [4.6/4.7 Regression] " paolo.carlini at oracle dot com
                   ` (9 subsequent siblings)
  10 siblings, 0 replies; 12+ messages in thread
From: dberger at oubliette dot org @ 2011-10-03 23:42 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50608

Dan Berger <dberger at oubliette dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |http://gcc.gnu.org/bugzilla
                   |                            |/show_bug.cgi?id=13648

--- Comment #1 from Dan Berger <dberger at oubliette dot org> 2011-10-03 23:42:32 UTC ---
Oh, I should say, this code compiles with 4.5.3.


^ permalink raw reply	[flat|nested] 12+ messages in thread

* [Bug c++/50608] [4.6/4.7 Regression] cannot apply 'offsetof' to a non constant address
  2011-10-03 23:41 [Bug c++/50608] New: cannot apply 'offsetof' to a non constant address dberger at oubliette dot org
  2011-10-03 23:42 ` [Bug c++/50608] " dberger at oubliette dot org
@ 2011-10-04  9:34 ` paolo.carlini at oracle dot com
  2011-10-10 11:29 ` rguenth at gcc dot gnu.org
                   ` (8 subsequent siblings)
  10 siblings, 0 replies; 12+ messages in thread
From: paolo.carlini at oracle dot com @ 2011-10-04  9:34 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50608

Paolo Carlini <paolo.carlini at oracle dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2011-10-04
            Summary|cannot apply 'offsetof' to  |[4.6/4.7 Regression] cannot
                   |a non constant address      |apply 'offsetof' to a non
                   |                            |constant address
     Ever Confirmed|0                           |1

--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-10-04 09:34:37 UTC ---
Seems a Regression.


^ permalink raw reply	[flat|nested] 12+ messages in thread

* [Bug c++/50608] [4.6/4.7 Regression] cannot apply 'offsetof' to a non constant address
  2011-10-03 23:41 [Bug c++/50608] New: cannot apply 'offsetof' to a non constant address dberger at oubliette dot org
  2011-10-03 23:42 ` [Bug c++/50608] " dberger at oubliette dot org
  2011-10-04  9:34 ` [Bug c++/50608] [4.6/4.7 Regression] " paolo.carlini at oracle dot com
@ 2011-10-10 11:29 ` rguenth at gcc dot gnu.org
  2011-10-10 15:23 ` rguenth at gcc dot gnu.org
                   ` (7 subsequent siblings)
  10 siblings, 0 replies; 12+ messages in thread
From: rguenth at gcc dot gnu.org @ 2011-10-10 11:29 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50608

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.6.2


^ permalink raw reply	[flat|nested] 12+ messages in thread

* [Bug c++/50608] [4.6/4.7 Regression] cannot apply 'offsetof' to a non constant address
  2011-10-03 23:41 [Bug c++/50608] New: cannot apply 'offsetof' to a non constant address dberger at oubliette dot org
                   ` (2 preceding siblings ...)
  2011-10-10 11:29 ` rguenth at gcc dot gnu.org
@ 2011-10-10 15:23 ` rguenth at gcc dot gnu.org
  2011-10-11  9:09 ` mikpe at it dot uu.se
                   ` (6 subsequent siblings)
  10 siblings, 0 replies; 12+ messages in thread
From: rguenth at gcc dot gnu.org @ 2011-10-10 15:23 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50608

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |rejects-valid
           Priority|P3                          |P2
      Known to work|                            |4.5.3
      Known to fail|                            |4.6.0


^ permalink raw reply	[flat|nested] 12+ messages in thread

* [Bug c++/50608] [4.6/4.7 Regression] cannot apply 'offsetof' to a non constant address
  2011-10-03 23:41 [Bug c++/50608] New: cannot apply 'offsetof' to a non constant address dberger at oubliette dot org
                   ` (3 preceding siblings ...)
  2011-10-10 15:23 ` rguenth at gcc dot gnu.org
@ 2011-10-11  9:09 ` mikpe at it dot uu.se
  2011-10-11  9:49 ` ebotcazou at gcc dot gnu.org
                   ` (5 subsequent siblings)
  10 siblings, 0 replies; 12+ messages in thread
From: mikpe at it dot uu.se @ 2011-10-11  9:09 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50608

Mikael Pettersson <mikpe at it dot uu.se> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ebotcazou at gcc dot
                   |                            |gnu.org, mikpe at it dot
                   |                            |uu.se

--- Comment #3 from Mikael Pettersson <mikpe at it dot uu.se> 2011-10-11 09:07:53 UTC ---
This regression started with r159800, Eric Botcazou's PR44100 fix:
http://gcc.gnu.org/ml/gcc-cvs/2010-05/msg00854.html


^ permalink raw reply	[flat|nested] 12+ messages in thread

* [Bug c++/50608] [4.6/4.7 Regression] cannot apply 'offsetof' to a non constant address
  2011-10-03 23:41 [Bug c++/50608] New: cannot apply 'offsetof' to a non constant address dberger at oubliette dot org
                   ` (4 preceding siblings ...)
  2011-10-11  9:09 ` mikpe at it dot uu.se
@ 2011-10-11  9:49 ` ebotcazou at gcc dot gnu.org
  2011-10-26 17:16 ` [Bug c++/50608] [4.6/4.7 regression] cannot apply 'offsetof' to a non-constant address jakub at gcc dot gnu.org
                   ` (4 subsequent siblings)
  10 siblings, 0 replies; 12+ messages in thread
From: ebotcazou at gcc dot gnu.org @ 2011-10-11  9:49 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50608

Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
         AssignedTo|unassigned at gcc dot       |ebotcazou at gcc dot
                   |gnu.org                     |gnu.org

--- Comment #4 from Eric Botcazou <ebotcazou at gcc dot gnu.org> 2011-10-11 09:48:05 UTC ---
It turns out that __builtin_offsetof goes through the new code.  Fixing...


^ permalink raw reply	[flat|nested] 12+ messages in thread

* [Bug c++/50608] [4.6/4.7 regression] cannot apply 'offsetof' to a non-constant address
  2011-10-03 23:41 [Bug c++/50608] New: cannot apply 'offsetof' to a non constant address dberger at oubliette dot org
                   ` (5 preceding siblings ...)
  2011-10-11  9:49 ` ebotcazou at gcc dot gnu.org
@ 2011-10-26 17:16 ` jakub at gcc dot gnu.org
  2011-11-04 21:46 ` ebotcazou at gcc dot gnu.org
                   ` (3 subsequent siblings)
  10 siblings, 0 replies; 12+ messages in thread
From: jakub at gcc dot gnu.org @ 2011-10-26 17:16 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50608

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|4.6.2                       |4.6.3

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-10-26 17:13:25 UTC ---
GCC 4.6.2 is being released.


^ permalink raw reply	[flat|nested] 12+ messages in thread

* [Bug c++/50608] [4.6/4.7 regression] cannot apply 'offsetof' to a non-constant address
  2011-10-03 23:41 [Bug c++/50608] New: cannot apply 'offsetof' to a non constant address dberger at oubliette dot org
                   ` (6 preceding siblings ...)
  2011-10-26 17:16 ` [Bug c++/50608] [4.6/4.7 regression] cannot apply 'offsetof' to a non-constant address jakub at gcc dot gnu.org
@ 2011-11-04 21:46 ` ebotcazou at gcc dot gnu.org
  2011-11-04 21:50 ` ebotcazou at gcc dot gnu.org
                   ` (2 subsequent siblings)
  10 siblings, 0 replies; 12+ messages in thread
From: ebotcazou at gcc dot gnu.org @ 2011-11-04 21:46 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50608

--- Comment #6 from Eric Botcazou <ebotcazou at gcc dot gnu.org> 2011-11-04 21:46:10 UTC ---
Author: ebotcazou
Date: Fri Nov  4 21:46:07 2011
New Revision: 180986

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=180986
Log:
2011-11-04  Eric Botcazou  <ebotcazou@adacore.com>

    PR c++/50608
    * c-parser.c (c_parser_postfix_expression) <RID_OFFSETOF>: Adjust call
    to fold_offsetof.
    * c-typeck.c (build_unary_op) <ADDR_EXPR>: Call fold_offsetof_1.
c-family/
    * c-common.c (c_fully_fold_internal) <ADDR_EXPR>: Call fold_offsetof_1.
    (fold_offsetof_1): Make global.  Remove STOP_REF argument and adjust.
    <INDIRECT_REF>: Return the argument.
    <ARRAY_REF>: Remove special code for negative offset.
    Call fold_build_pointer_plus instead of size_binop.
    (fold_offsetof): Remove STOP_REF argument and adjust.
    * c-common.h (fold_offsetof_1): Declare.
    (fold_offsetof): Remove STOP_REF argument.
cp/
    * semantics.c (finish_offsetof): Adjust call to fold_offsetof.
    * typeck.c (cp_build_addr_expr_1): Call fold_offsetof_1.

Added:
    trunk/gcc/testsuite/g++.dg/other/offsetof7.C
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/c-family/ChangeLog
    trunk/gcc/c-family/c-common.c
    trunk/gcc/c-family/c-common.h
    trunk/gcc/c-parser.c
    trunk/gcc/c-typeck.c
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/semantics.c
    trunk/gcc/cp/typeck.c
    trunk/gcc/testsuite/ChangeLog


^ permalink raw reply	[flat|nested] 12+ messages in thread

* [Bug c++/50608] [4.6/4.7 regression] cannot apply 'offsetof' to a non-constant address
  2011-10-03 23:41 [Bug c++/50608] New: cannot apply 'offsetof' to a non constant address dberger at oubliette dot org
                   ` (7 preceding siblings ...)
  2011-11-04 21:46 ` ebotcazou at gcc dot gnu.org
@ 2011-11-04 21:50 ` ebotcazou at gcc dot gnu.org
  2011-11-04 21:53 ` ebotcazou at gcc dot gnu.org
  2012-06-12  3:11 ` amker at gcc dot gnu.org
  10 siblings, 0 replies; 12+ messages in thread
From: ebotcazou at gcc dot gnu.org @ 2011-11-04 21:50 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50608

--- Comment #7 from Eric Botcazou <ebotcazou at gcc dot gnu.org> 2011-11-04 21:49:52 UTC ---
Author: ebotcazou
Date: Fri Nov  4 21:49:49 2011
New Revision: 180988

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=180988
Log:
2011-11-04  Eric Botcazou  <ebotcazou@adacore.com>

    PR c++/50608
    * c-parser.c (c_parser_postfix_expression) <RID_OFFSETOF>: Adjust call
    to fold_offsetof.
    * c-typeck.c (build_unary_op) <ADDR_EXPR>: Call fold_offsetof_1.
c-family/
    * c-common.c (c_fully_fold_internal) <ADDR_EXPR>: Call fold_offsetof_1.
    (fold_offsetof_1): Make global.  Remove STOP_REF argument and adjust.
    <INDIRECT_REF>: Return the argument.
    <ARRAY_REF>: Remove special code for negative offset.
    Call fold_build_pointer_plus instead of size_binop.
    (fold_offsetof): Remove STOP_REF argument and adjust.
    * c-common.h (fold_offsetof_1): Declare.
    (fold_offsetof): Remove STOP_REF argument.
cp/
    * semantics.c (finish_offsetof): Adjust call to fold_offsetof.
    * typeck.c (cp_build_addr_expr_1): Call fold_offsetof_1.

Added:
    branches/gcc-4_6-branch/gcc/testsuite/g++.dg/other/offsetof7.C
Modified:
    branches/gcc-4_6-branch/gcc/ChangeLog
    branches/gcc-4_6-branch/gcc/c-family/ChangeLog
    branches/gcc-4_6-branch/gcc/c-family/c-common.c
    branches/gcc-4_6-branch/gcc/c-family/c-common.h
    branches/gcc-4_6-branch/gcc/c-parser.c
    branches/gcc-4_6-branch/gcc/c-typeck.c
    branches/gcc-4_6-branch/gcc/cp/ChangeLog
    branches/gcc-4_6-branch/gcc/cp/semantics.c
    branches/gcc-4_6-branch/gcc/cp/typeck.c
    branches/gcc-4_6-branch/gcc/testsuite/ChangeLog


^ permalink raw reply	[flat|nested] 12+ messages in thread

* [Bug c++/50608] [4.6/4.7 regression] cannot apply 'offsetof' to a non-constant address
  2011-10-03 23:41 [Bug c++/50608] New: cannot apply 'offsetof' to a non constant address dberger at oubliette dot org
                   ` (8 preceding siblings ...)
  2011-11-04 21:50 ` ebotcazou at gcc dot gnu.org
@ 2011-11-04 21:53 ` ebotcazou at gcc dot gnu.org
  2012-06-12  3:11 ` amker at gcc dot gnu.org
  10 siblings, 0 replies; 12+ messages in thread
From: ebotcazou at gcc dot gnu.org @ 2011-11-04 21:53 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50608

Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
            Version|4.6.1                       |4.6.3
         Resolution|                            |FIXED

--- Comment #8 from Eric Botcazou <ebotcazou at gcc dot gnu.org> 2011-11-04 21:52:41 UTC ---
Patch applied.


^ permalink raw reply	[flat|nested] 12+ messages in thread

* [Bug c++/50608] [4.6/4.7 regression] cannot apply 'offsetof' to a non-constant address
  2011-10-03 23:41 [Bug c++/50608] New: cannot apply 'offsetof' to a non constant address dberger at oubliette dot org
                   ` (9 preceding siblings ...)
  2011-11-04 21:53 ` ebotcazou at gcc dot gnu.org
@ 2012-06-12  3:11 ` amker at gcc dot gnu.org
  10 siblings, 0 replies; 12+ messages in thread
From: amker at gcc dot gnu.org @ 2012-06-12  3:11 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50608

--- Comment #9 from amker at gcc dot gnu.org 2012-06-12 03:11:03 UTC ---
Author: amker
Date: Tue Jun 12 03:10:55 2012
New Revision: 188418

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=188418
Log:
    Backport r180986 from mainline
    2011-11-04  Eric Botcazou  <ebotcazou@adacore.com>

    PR c++/50608
    * c-common.c (c_fully_fold_internal) <ADDR_EXPR>: Call fold_offsetof_1.
    (fold_offsetof_1): Make global.  Remove STOP_REF argument and adjust.
    <INDIRECT_REF>: Return the argument.
    <ARRAY_REF>: Remove special code for negative offset.
    Call fold_build_pointer_plus instead of size_binop.
    (fold_offsetof): Remove STOP_REF argument and adjust.
    * c-common.h (fold_offsetof_1): Declare.
    (fold_offsetof): Remove STOP_REF argument.

    PR c++/50608
    * c-parser.c (c_parser_postfix_expression) <RID_OFFSETOF>: Adjust call
    to fold_offsetof.
    * c-typeck.c (build_unary_op) <ADDR_EXPR>: Call fold_offsetof_1.

    * g++.dg/other/offsetof7.C: New test.

    PR c++/50608
    * semantics.c (finish_offsetof): Adjust call to fold_offsetof.
    * typeck.c (cp_build_addr_expr_1): Call fold_offsetof_1.


Added:
    branches/ARM/embedded-4_6-branch/gcc/c-family/ChangeLog.arm
    branches/ARM/embedded-4_6-branch/gcc/cp/ChangeLog.arm
    branches/ARM/embedded-4_6-branch/gcc/testsuite/g++.dg/other/offsetof7.C
Modified:
    branches/ARM/embedded-4_6-branch/gcc/ChangeLog.arm
    branches/ARM/embedded-4_6-branch/gcc/c-family/c-common.c
    branches/ARM/embedded-4_6-branch/gcc/c-family/c-common.h
    branches/ARM/embedded-4_6-branch/gcc/c-parser.c
    branches/ARM/embedded-4_6-branch/gcc/c-typeck.c
    branches/ARM/embedded-4_6-branch/gcc/cp/semantics.c
    branches/ARM/embedded-4_6-branch/gcc/cp/typeck.c
    branches/ARM/embedded-4_6-branch/gcc/testsuite/ChangeLog.arm


^ permalink raw reply	[flat|nested] 12+ messages in thread

end of thread, other threads:[~2012-06-12  3:11 UTC | newest]

Thread overview: 12+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2011-10-03 23:41 [Bug c++/50608] New: cannot apply 'offsetof' to a non constant address dberger at oubliette dot org
2011-10-03 23:42 ` [Bug c++/50608] " dberger at oubliette dot org
2011-10-04  9:34 ` [Bug c++/50608] [4.6/4.7 Regression] " paolo.carlini at oracle dot com
2011-10-10 11:29 ` rguenth at gcc dot gnu.org
2011-10-10 15:23 ` rguenth at gcc dot gnu.org
2011-10-11  9:09 ` mikpe at it dot uu.se
2011-10-11  9:49 ` ebotcazou at gcc dot gnu.org
2011-10-26 17:16 ` [Bug c++/50608] [4.6/4.7 regression] cannot apply 'offsetof' to a non-constant address jakub at gcc dot gnu.org
2011-11-04 21:46 ` ebotcazou at gcc dot gnu.org
2011-11-04 21:50 ` ebotcazou at gcc dot gnu.org
2011-11-04 21:53 ` ebotcazou at gcc dot gnu.org
2012-06-12  3:11 ` amker at gcc dot gnu.org

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