[PATCH] Fortran: handle procedure pointer component in DT array [PR110826]

[Harald Anlauf <anlauf@gmx.de>]

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Dear all,

the attached patch fixes an ICE-on-valid code when assigning
a procedure pointer that is a component of a DT array and
the function in question is array-valued.  (The procedure
pointer itself cannot be an array.)

Regtested on x86_64-pc-linux-gnu.  OK for mainline?

Thanks,
Harald


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From a9be17cf987b796c49684cde2f20dac3839c736c Mon Sep 17 00:00:00 2001
From: Harald Anlauf <anlauf@gmx.de>
Date: Mon, 11 Mar 2024 22:05:51 +0100
Subject: [PATCH] Fortran: handle procedure pointer component in DT array
 [PR110826]

gcc/fortran/ChangeLog:

	PR fortran/110826
	* array.cc (gfc_array_dimen_size): When walking the ref chain of an
	array and the ultimate component is a procedure pointer, do not try
	to figure out its dimension even if it is a array-valued function.

gcc/testsuite/ChangeLog:

	PR fortran/110826
	* gfortran.dg/proc_ptr_comp_53.f90: New test.
---
 gcc/fortran/array.cc                          |  7 ++++
 .../gfortran.dg/proc_ptr_comp_53.f90          | 41 +++++++++++++++++++
 2 files changed, 48 insertions(+)
 create mode 100644 gcc/testsuite/gfortran.dg/proc_ptr_comp_53.f90

diff --git a/gcc/fortran/array.cc b/gcc/fortran/array.cc
index 3a6e3a7c95b..e9934f1491b 100644
--- a/gcc/fortran/array.cc
+++ b/gcc/fortran/array.cc
@@ -2597,6 +2597,13 @@ gfc_array_dimen_size (gfc_expr *array, int dimen, mpz_t *result)
     case EXPR_FUNCTION:
       for (ref = array->ref; ref; ref = ref->next)
 	{
+	  /* Ultimate component is a procedure pointer.  */
+	  if (ref->type == REF_COMPONENT
+	      && !ref->next
+	      && ref->u.c.component->attr.function
+	      && IS_PROC_POINTER (ref->u.c.component))
+	    return false;
+
 	  if (ref->type != REF_ARRAY)
 	    continue;

diff --git a/gcc/testsuite/gfortran.dg/proc_ptr_comp_53.f90 b/gcc/testsuite/gfortran.dg/proc_ptr_comp_53.f90
new file mode 100644
index 00000000000..881ddd3558f
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/proc_ptr_comp_53.f90
@@ -0,0 +1,41 @@
+! { dg-do compile }
+! PR fortran/110826 - procedure pointer component in DT array
+
+module m
+  implicit none
+
+  type pp
+    procedure(func_template), pointer, nopass :: f =>null()
+  end type pp
+
+  abstract interface
+     function func_template(state) result(dstate)
+       implicit none
+       real, dimension(:,:), intent(in)              :: state
+       real, dimension(size(state,1), size(state,2)) :: dstate
+     end function
+  end interface
+
+contains
+
+  function zero_state(state) result(dstate)
+    real, dimension(:,:), intent(in)              :: state
+    real, dimension(size(state,1), size(state,2)) :: dstate
+    dstate = 0.
+  end function zero_state
+
+end module m
+
+program test_func_array
+  use m
+  implicit none
+
+  real, dimension(4,6) :: state
+  type(pp) :: func_scalar
+  type(pp) :: func_array(4)
+
+  func_scalar  %f => zero_state
+  func_array(1)%f => zero_state
+  print *, func_scalar  %f(state)
+  print *, func_array(1)%f(state)
+end program test_func_array
--
2.35.3