* [Bug fortran/29786] [4.1/4.2/4.3 Regression] rejects equivalence
2006-11-09 19:50 [Bug fortran/29786] New: [4.1/4.2/4.3 Regression] rejects equivalence aldot at gcc dot gnu dot org
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------- Comment #1 from pault at gcc dot gnu dot org 2006-11-09 20:14 -------
Confirmed
Paul
--
pault 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 |2006-11-09 20:14:18
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29786
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From: pault at gcc dot gnu dot org @ 2006-11-10 8:26 UTC (permalink / raw)
To: gcc-bugs
[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain, Size: 2230 bytes --]
------- Comment #2 from pault at gcc dot gnu dot org 2006-11-10 08:25 -------
(In reply to comment #1)
14.6.3.3 Association of scalar data objects
...snip...
A storage unit shall not be explicitly initialized more than once in a program.
Explicit initialization overrides default initialization, and default
initialization for an object of derived type overrides default initialization
for a component of the object (4.4.1). Default initialization may be specified
for a storage unit that is storage associated provided the objects or
subobjects supplying the default initialization are of the same type and type
parameters, and supply the same value for the storage unit.
This is intended to be general, I think; ie. to apply to more than scalar data
objects. In any case, prior usage requires that "storage unit" be understood
in its complete generality.
The problem occurs in resolve.c:6674, where there is no attempt to see if the
storage unit is the same for scalar/array-ref or array-ref/array-ref
equivalences and data statements. This is OK for F90 initialization, where
arrays are completely initialized, but not for data statements.
If the error is suppressed by excluding (sym->attr.data && sym->as != NULL), we
run into a todo in trans-common.c:
pr29786.f90: In function 'MAIN__':
pr29786.f90:1: fatal error: gfc_todo: Not Implemented: Initialization of
overlap
ping variables compilation terminated.
This looks like one of Sherlock Holme's "three pipers".
Paul
Index: gcc/fortran/resolve.c
===================================================================
*** gcc/fortran/resolve.c (révision 118551)
--- gcc/fortran/resolve.c (copie de travail)
*************** resolve_equivalence (gfc_equiv *eq)
*** 6671,6677 ****
/* An equivalence statement cannot have more than one initialized
object. */
! if (sym->value)
{
if (value_name != NULL)
{
--- 6671,6677 ----
/* An equivalence statement cannot have more than one initialized
object. */
! if (sym->value && !(sym->attr.data && sym->as != NULL))
{
if (value_name != NULL)
{
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29786
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2006-11-09 20:14 ` [Bug fortran/29786] " pault at gcc dot gnu dot org
2006-11-10 8:26 ` pault at gcc dot gnu dot org
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------- Comment #3 from pault at gcc dot gnu dot org 2007-01-12 06:00 -------
The attached bootstraps and regtests on IA64/FC5 - it even fixes the bug, as
the testcase shows. (I will have to do the attaching a bit later - whatever I
try with cookies does not seem to work right now.)
The patch works by checking for overlapping equivalence members with
initializers, which gfc already did; on detecting such overlaps, a new char*
field is created that spans the entire union. The equivalence group is then
scanned for initializers, which are then byte-wize converted to char* (Note
that this is half the job of simplify_array_transfer:) ). The char* in it's
turn is converted into a tree-ssa vector constructor, which becomes the only
initializer for the union.
Another approach to this would have been to create a structure field, with
components corresponding to the non-null, non-overlapping constructors. I did
not do this on grounds of simplicity.
The patch does not implement overlapping derived types with initializers; it
could be done without too much trouble and probably should be, in spite of all
the gotcha's that are involved in putting derived types in equivalences.
The part of the patch that is giving me pause is the conversion of integers;
because gmp does not offer a mpz_t to signed long long, I used the conversion
in tree-const.c and write from two longs. These have to be ordered according
to endian-ness. Could somebody advise on how to do this, please?
Paul
--
pault at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |pault at gcc dot gnu dot org
|dot org |
Status|NEW |ASSIGNED
Last reconfirmed|2006-11-09 20:14:18 |2007-01-12 06:00:50
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29786
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------- Comment #4 from pault at gcc dot gnu dot org 2007-01-12 08:12 -------
Created an attachment (id=12894)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=12894&action=view)
The patch promised above
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29786
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To: gcc-bugs
------- Comment #5 from pault at gcc dot gnu dot org 2007-01-14 13:32 -------
I do not seem able to fix the problem with attachments on my machine...
Following yesterday's discussion on the list,
trans-common.c:445
switch (e->ts.type)
{
case BT_INTEGER:
if (WORDS_BIG_ENDIAN)
gfc_conv_mpz_to_integers (e->value.integer,
&buffer[0], &buffer[1]);
else
gfc_conv_mpz_to_integers (e->value.integer,
&buffer[1], &buffer[0]);
memcpy (data, buffer, len);
return;
to replace the BT_INTEGER case in the attachment should do the job.
It needs testing now on 64 bit machines with both endian-nesses.
Brooks, I have reassigned this PR to you; I am very happy to help
out/collaborate on it but I think you are right - I just do not have the time
to see it through, right now.
Paul
--
pault at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|pault at gcc dot gnu dot org|brooks at gcc dot gnu dot
| |org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29786
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------- Comment #6 from pault at gcc dot gnu dot org 2007-01-14 13:42 -------
Forget the previous; it's wrong!
It does indicate that WORDS_BIG_ENDIAN and friends are available, however.
Paul
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29786
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------- Comment #7 from pault at gcc dot gnu dot org 2007-02-03 16:20 -------
Brooks,
It wasn't fair to deposit this one on you so I have taken it back.
Cheers
Paul
--
pault at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|brooks at gcc dot gnu dot |pault at gcc dot gnu dot org
|org |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29786
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--
jsm28 at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |4.1.2
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29786
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--
mmitchel at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P5
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29786
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--
mmitchel at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|4.1.2 |4.1.3
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29786
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2007-02-14 10:04 ` mmitchel at gcc dot gnu dot org
@ 2007-04-23 19:48 ` brooks at gcc dot gnu dot org
2007-04-23 19:49 ` [Bug fortran/29786] [4.1/4.2/4.3 Regression] Initialization of overlapping variables: Not implemented brooks at gcc dot gnu dot org
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From: brooks at gcc dot gnu dot org @ 2007-04-23 19:48 UTC (permalink / raw)
To: gcc-bugs
------- Comment #8 from brooks at gcc dot gnu dot org 2007-04-23 20:48 -------
*** Bug 31672 has been marked as a duplicate of this bug. ***
--
brooks at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |beliavsky at aol dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29786
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From: brooks at gcc dot gnu dot org @ 2007-04-23 19:49 UTC (permalink / raw)
To: gcc-bugs
------- Comment #9 from brooks at gcc dot gnu dot org 2007-04-23 20:49 -------
I'm changing the name of this bug to make it a lot easier to find, now that we
know what the actual problem is.
Also, PR #31672 contains an excellent testcase for this, which I'll quote here:
----------------------------------------------
function d1mach(i)
implicit none
double precision d1mach,dmach(5)
integer i,large(4),small(4)
equivalence ( dmach(1), small(1) )
equivalence ( dmach(2), large(1) )
data small(1),small(2) / 0, 1048576/
data large(1),large(2) /-1,2146435071/
d1mach = 0.0d0
end function d1mach
----------------------------------------------
--
brooks at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[4.1/4.2/4.3 Regression] |[4.1/4.2/4.3 Regression]
|rejects equivalence |Initialization of
| |overlapping variables: Not
| |implemented
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29786
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--
brooks at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P5 |P2
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29786
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2007-04-23 19:52 ` brooks at gcc dot gnu dot org
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From: pinskia at gcc dot gnu dot org @ 2007-04-23 20:50 UTC (permalink / raw)
To: gcc-bugs
------- Comment #10 from pinskia at gcc dot gnu dot org 2007-04-23 21:50 -------
> brooks@gcc.gnu.org 2007-04-23 20:51:45 Priority P5 P2
The release manager is the only one who is able to change the priority.
Changing the Priority back to P5 based on this is a fortran bug so not blocking
the release.
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P2 |P5
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29786
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From: pault at gcc dot gnu dot org @ 2007-05-24 7:11 UTC (permalink / raw)
To: gcc-bugs
------- Comment #11 from pault at gcc dot gnu dot org 2007-05-24 08:10 -------
Just to let you all know; I have had a patch ready for this and PR30875 for
somewhile. This was awaiting the commit of Brook's simplify_transfer patch and
all the machinery in target-memory.c. Well, during the wait it suffered a bit
of x86_ia64 specific bit-rot, whose cause I just do not see right now. Ia m
working on it, though:)
Paul
--
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From: patchapp at dberlin dot org @ 2007-05-24 12:58 UTC (permalink / raw)
To: gcc-bugs
------- Comment #12 from patchapp at dberlin dot org 2007-05-24 13:57 -------
Subject: Bug number PR29786
A patch for this bug has been added to the patch tracker.
The mailing list url for the patch is
http://gcc.gnu.org/ml/gcc-patches/2007-05/msg01609.html
--
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From: pault at gcc dot gnu dot org @ 2007-06-11 22:39 UTC (permalink / raw)
To: gcc-bugs
------- Comment #13 from pault at gcc dot gnu dot org 2007-06-11 22:39 -------
Subject: Bug 29786
Author: pault
Date: Mon Jun 11 22:39:21 2007
New Revision: 125628
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=125628
Log:
2007-06-12 Paul Thomas <pault@gcc.gnu.org>
PR fortran/29786
PR fortran/30875
* trans-common.c (get_init_field): New function.
(create_common): Call get_init_field for overlapping
initializers in equivalence blocks.
* resolve.c (resolve_equivalence_derived, resolve_equivalence):
Remove constraints on initializers in equivalence blocks.
* target-memory.c (expr_to_char, gfc_merge_initializers):
New functions.
(encode_derived): Add the bit offset to the byte offset to get
the total offset to the field.
* target-memory.h : Add prototype for gfc_merge_initializers.
2007-06-12 Paul Thomas <pault@gcc.gnu.org>
PR fortran/29786
* gfortran.dg/equiv_7.f90: New test.
* gfortran.dg/equiv_constraint_7.f90: Change error message.
PR fortran/30875
* gfortran.dg/equiv_constraint_5.f90: Correct code and error.
Added:
trunk/gcc/testsuite/gfortran.dg/equiv_7.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/resolve.c
trunk/gcc/fortran/target-memory.c
trunk/gcc/fortran/target-memory.h
trunk/gcc/fortran/trans-common.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gfortran.dg/equiv_constraint_5.f90
trunk/gcc/testsuite/gfortran.dg/equiv_constraint_7.f90
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29786
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From: pault at gcc dot gnu dot org @ 2007-06-11 22:41 UTC (permalink / raw)
To: gcc-bugs
------- Comment #14 from pault at gcc dot gnu dot org 2007-06-11 22:41 -------
fixed on trunk
Paul
--
pault at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution| |FIXED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29786
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