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* [gcc r14-9086] Fortran: fix passing array component ref to polymorphic procedures
@ 2024-02-20 19:50 Harald Anlauf
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From: Harald Anlauf @ 2024-02-20 19:50 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:14ba8d5b87acd5f91ab8b8c02165a0fd53dcc2f2
commit r14-9086-g14ba8d5b87acd5f91ab8b8c02165a0fd53dcc2f2
Author: Peter Hill <peter.hill@york.ac.uk>
Date: Tue Feb 20 20:42:53 2024 +0100
Fortran: fix passing array component ref to polymorphic procedures
PR fortran/105658
gcc/fortran/ChangeLog:
* trans-expr.cc (gfc_conv_intrinsic_to_class): When passing an
array component reference of intrinsic type to a procedure
with an unlimited polymorphic dummy argument, a temporary
should be created.
gcc/testsuite/ChangeLog:
* gfortran.dg/PR105658.f90: New test.
Signed-off-by: Peter Hill <peter.hill@york.ac.uk>
Diff:
---
gcc/fortran/trans-expr.cc | 8 ++++++
gcc/testsuite/gfortran.dg/PR105658.f90 | 50 ++++++++++++++++++++++++++++++++++
2 files changed, 58 insertions(+)
diff --git a/gcc/fortran/trans-expr.cc b/gcc/fortran/trans-expr.cc
index 3506e4e4cb0b..118dfd7c9b23 100644
--- a/gcc/fortran/trans-expr.cc
+++ b/gcc/fortran/trans-expr.cc
@@ -1019,6 +1019,14 @@ gfc_conv_intrinsic_to_class (gfc_se *parmse, gfc_expr *e,
tmp = gfc_typenode_for_spec (&class_ts);
var = gfc_create_var (tmp, "class");
+ /* Force a temporary for component or substring references. */
+ if (unlimited_poly
+ && class_ts.u.derived->components->attr.dimension
+ && !class_ts.u.derived->components->attr.allocatable
+ && !class_ts.u.derived->components->attr.class_pointer
+ && is_subref_array (e))
+ parmse->force_tmp = 1;
+
/* Set the vptr. */
ctree = gfc_class_vptr_get (var);
diff --git a/gcc/testsuite/gfortran.dg/PR105658.f90 b/gcc/testsuite/gfortran.dg/PR105658.f90
new file mode 100644
index 000000000000..8aacecf806e7
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/PR105658.f90
@@ -0,0 +1,50 @@
+! { dg-do compile }
+! { dg-options "-Warray-temporaries" }
+! Test fix for incorrectly passing array component to unlimited polymorphic procedure
+
+module test_PR105658_mod
+ implicit none
+ type :: foo
+ integer :: member1
+ integer :: member2
+ end type foo
+contains
+ subroutine print_poly(array)
+ class(*), dimension(:), intent(in) :: array
+ select type(array)
+ type is (integer)
+ print*, array
+ type is (character(*))
+ print *, array
+ end select
+ end subroutine print_poly
+
+ subroutine do_print(thing)
+ type(foo), dimension(3), intent(in) :: thing
+ type(foo), parameter :: y(3) = [foo(1,2),foo(3,4),foo(5,6)]
+ integer :: i, j, uu(5,6)
+
+ call print_poly(thing%member1) ! { dg-warning "array temporary" }
+ call print_poly(y%member2) ! { dg-warning "array temporary" }
+ call print_poly(y(1::2)%member2) ! { dg-warning "array temporary" }
+
+ ! The following array sections work without temporaries
+ uu = reshape([(((10*i+j),i=1,5),j=1,6)],[5,6])
+ print *, uu(2,2::2)
+ call print_poly (uu(2,2::2)) ! no temp needed!
+ print *, uu(1::2,6)
+ call print_poly (uu(1::2,6)) ! no temp needed!
+ end subroutine do_print
+
+ subroutine do_print2(thing2)
+ class(foo), dimension(:), intent(in) :: thing2
+ call print_poly (thing2% member2) ! { dg-warning "array temporary" }
+ end subroutine do_print2
+
+ subroutine do_print3 ()
+ character(3) :: c(3) = ["abc","def","ghi"]
+ call print_poly (c(1::2)) ! no temp needed!
+ call print_poly (c(1::2)(2:3)) ! { dg-warning "array temporary" }
+ end subroutine do_print3
+
+end module test_PR105658_mod
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