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re PR fortran/45019 (Aliasing of TARGET dummy argument not detected correctly) 

2010-07-22  Tobias Burnus  <burnus@net-b.de>

        PR fortran/45019
        * dependency.c (gfc_check_dependency): Add argument alising
        * check.
        * symbol.c (gfc_symbols_could_alias): Add argument alising
        * check.

2010-07-22  Tobias Burnus  <burnus@net-b.de>

        PR fortran/45019
        * gfortran.dg/aliasing_dummy_5.f90: New.

From-SVN: r162410
This commit is contained in:
Tobias Burnus 2010-07-22 13:35:09 +02:00
parent ba3ff5c2db
commit e1d818f7ea
5 changed files with 91 additions and 1 deletions
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6
gcc/fortran/ChangeLog
View File

@ -1,3 +1,9 @@
2010-07-22 Tobias Burnus <burnus@net-b.de>
PR fortran/45019
* dependency.c (gfc_check_dependency): Add argument alising check.
* symbol.c (gfc_symbols_could_alias): Add argument alising check.
2010-07-22 Daniel Kraft <d@domob.eu>
* trans-stmt.c (gfc_trans_return): Put back in the handling of se.post,

13
gcc/fortran/dependency.c
View File

@ -807,6 +807,19 @@ gfc_check_dependency (gfc_expr *expr1, gfc_expr *expr2, bool identical)
return 1;
}
else
{
gfc_symbol *sym1 = expr1->symtree->n.sym;
gfc_symbol *sym2 = expr2->symtree->n.sym;
if (sym1->attr.target && sym2->attr.target
&& ((sym1->attr.dummy && !sym1->attr.contiguous
&& (!sym1->attr.dimension
|| sym2->as->type == AS_ASSUMED_SHAPE))
|| (sym2->attr.dummy && !sym2->attr.contiguous
&& (!sym2->attr.dimension
|| sym2->as->type == AS_ASSUMED_SHAPE))))
return 1;
}
/* Otherwise distinct symbols have no dependencies. */
return 0;

11
gcc/fortran/symbol.c
View File

@ -2811,6 +2811,17 @@ gfc_symbols_could_alias (gfc_symbol *lsym, gfc_symbol *rsym)
if (lsym->attr.allocatable && rsym->attr.pointer)
return 1;
/* Special case: Argument association, cf. F90 12.4.1.6, F2003 12.4.1.7
and F2008 12.5.2.13 items 3b and 4b. The pointer case (a) is already
checked above. */
if (lsym->attr.target && rsym->attr.target
&& ((lsym->attr.dummy && !lsym->attr.contiguous
&& (!lsym->attr.dimension || lsym->as->type == AS_ASSUMED_SHAPE))
|| (rsym->attr.dummy && !rsym->attr.contiguous
&& (!rsym->attr.dimension
|| rsym->as->type == AS_ASSUMED_SHAPE))))
return 1;
return 0;
}

7
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,8 @@
2010-07-22 Tobias Burnus <burnus@net-b.de>
PR fortran/45019
* gfortran.dg/aliasing_dummy_5.f90: New.
2010-07-22 Ramana Radhakrishnan <ramana.radhakrishnan@arm.com>
PR target/43698
@ -6,7 +11,7 @@
2010-07-21 Steven G. Kargl <kargl@gcc.gnu.org>
PR fortran/44929
* Revert my commit r162325 for this PR.
* Revert my commit r162325 for this PR.
2010-07-21 Jakub Jelinek <jakub@redhat.com>

55
gcc/testsuite/gfortran.dg/aliasing_dummy_5.f90 Normal file
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@ -0,0 +1,55 @@
! { dg-do run }
!
! PR fortran/45019
!
! Check that the compiler knows that
! "arg" and "arr" can alias.
!
MODULE m
IMPLICIT NONE
INTEGER, TARGET :: arr(3)
CONTAINS
SUBROUTINE foobar (arg)
INTEGER, TARGET :: arg(:)
arr(2:3) = arg(1:2)
END SUBROUTINE foobar
END MODULE m
PROGRAM main
USE m
IMPLICIT NONE
arr = (/ 1, 2, 3 /)
CALL bar(arr)
if (any (arr /= (/ 1, 1, 2 /))) call abort()
CALL test()
contains
subroutine bar(x)
INTEGER, TARGET :: x(:)
CALL foobar (x)
end subroutine bar
END PROGRAM main
MODULE m2
IMPLICIT NONE
INTEGER, TARGET :: arr(3)
CONTAINS
SUBROUTINE foobar (arg)
INTEGER, TARGET :: arg(:)
arr(1) = 5
arg(1) = 6
if (arr(1) == 5) call abort()
END SUBROUTINE foobar
END MODULE m2
subroutine test
USE m2
IMPLICIT NONE
arr = (/ 1, 2, 3 /)
CALL bar(arr)
contains
subroutine bar(x)
INTEGER, TARGET :: x(:)
CALL foobar (x)
end subroutine bar
END subroutine test
! { dg-final { cleanup-modules "m m2" } }