[PATCH, v2] Fortran: resolve correct generic with TYPE(C_PTR) arguments [PR61615]

[Harald Anlauf <anlauf@gmx.de>]

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Hi Jerry, all,

On 4/11/23 02:43, Jerry D via Gcc-patches wrote:
> On 4/10/23 1:49 PM, Harald Anlauf via Fortran wrote:
>> Dear all,
>>
>> when comparing formal and actual arguments of a procedure, there was no
>> check of rank for derived types from intrinsic module ISO_C_BINDING.
>> This could lead to a wrong resolution of generic procedures with dummy
>> argument of related types, see PR.  This was likely an oversight.
>>
>> The attached fix is simple and regtests cleanly on x86_64-pc-linux-gnu.
>>
>> OK for mainline?
>>
>> Thanks,
>> Harald
>>
>
> Looks good to go.
>
> Jerry

I actually found a flaw in the previous patch regarding the handling
of rank, and also realized that a comparison of the types was missing
for those from this intrinsic module (and found the related PR99982).

I updated the patch accordingly and extended the testcase, see attached.

Regtests cleanly on x86_64-pc-linux-gnu.

Will wait for 24h for more comments.

Thanks,
Harald


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From 3fa9d2ee99afa38f42c267d17aed5266daa22dbc Mon Sep 17 00:00:00 2001
From: Harald Anlauf <anlauf@gmx.de>
Date: Tue, 11 Apr 2023 16:44:32 +0200
Subject: [PATCH] Fortran: resolve correct generic with TYPE(C_PTR) arguments
 [PR61615,PR99982]

gcc/fortran/ChangeLog:

	PR fortran/61615
	PR fortran/99982
	* interface.cc (compare_parameter): Enable type and rank checks for
	arguments of derived type from the intrinsic module ISO_C_BINDING.

gcc/testsuite/ChangeLog:

	PR fortran/61615
	PR fortran/99982
	* gfortran.dg/interface_49.f90: New test.
---
 gcc/fortran/interface.cc                   | 18 +++-
 gcc/testsuite/gfortran.dg/interface_49.f90 | 95 ++++++++++++++++++++++
 2 files changed, 112 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/gfortran.dg/interface_49.f90

diff --git a/gcc/fortran/interface.cc b/gcc/fortran/interface.cc
index db79b104dc2..e9843e9549c 100644
--- a/gcc/fortran/interface.cc
+++ b/gcc/fortran/interface.cc
@@ -2361,7 +2361,23 @@ compare_parameter (gfc_symbol *formal, gfc_expr *actual,
       && formal->ts.u.derived && formal->ts.u.derived->ts.is_iso_c
       && actual->ts.type == BT_DERIVED
       && actual->ts.u.derived && actual->ts.u.derived->ts.is_iso_c)
-    return true;
+    {
+      if (formal->ts.u.derived->intmod_sym_id
+	  != actual->ts.u.derived->intmod_sym_id)
+	return false;
+
+      if (ranks_must_agree
+	  && symbol_rank (formal) != actual->rank
+	  && symbol_rank (formal) != -1)
+	{
+	  if (where)
+	    argument_rank_mismatch (formal->name, &actual->where,
+				    symbol_rank (formal), actual->rank,
+				    NULL);
+	  return false;
+	}
+      return true;
+    }
 
   if (formal->ts.type == BT_CLASS && actual->ts.type == BT_DERIVED)
     /* Make sure the vtab symbol is present when
diff --git a/gcc/testsuite/gfortran.dg/interface_49.f90 b/gcc/testsuite/gfortran.dg/interface_49.f90
new file mode 100644
index 00000000000..aef5e0c6609
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/interface_49.f90
@@ -0,0 +1,95 @@
+! { dg-do run }
+! PR fortran/61615 - resolve correct generic with TYPE(C_PTR) arguments
+! PR fortran/99982 - dto. with C_PTR and C_FUNPTR
+! Contributed by Jacob Abel and Scot Breitenfeld
+
+MODULE foo
+  USE iso_c_binding, only : c_ptr, c_funptr
+  IMPLICIT NONE
+  integer      :: rank = -99
+  character(8) :: ctyp = ""
+  INTERFACE bar
+    MODULE PROCEDURE bar_s
+    MODULE PROCEDURE bar_a1d
+    MODULE PROCEDURE bar_a2d
+    MODULE PROCEDURE bar_fp
+    MODULE PROCEDURE bar_fp1
+    MODULE PROCEDURE bar_fpx
+  END INTERFACE bar
+CONTAINS
+  SUBROUTINE bar_s(a)
+    TYPE(c_ptr) :: a
+    WRITE (0, *) 'in bar_s'
+    rank = 0
+    ctyp = "c_ptr"
+  END SUBROUTINE bar_s
+
+  SUBROUTINE bar_a1d(a)
+    TYPE(c_ptr) :: a(:)
+    WRITE (0, *) 'in bar_a1d'
+    rank = 1
+    ctyp = "c_ptr"
+  END SUBROUTINE bar_a1d
+
+  SUBROUTINE bar_a2d(a)
+    TYPE(c_ptr) :: a(:,:)
+    WRITE (0, *) 'in bar_a2d'
+    rank = 2
+    ctyp = "c_ptr"
+  END SUBROUTINE bar_a2d
+
+  SUBROUTINE bar_fp(a)
+    TYPE(c_funptr) :: a
+    WRITE (0, *) 'in bar_fp'
+    rank = 0
+    ctyp = "c_funptr"
+  END SUBROUTINE bar_fp
+
+  SUBROUTINE bar_fp1(a)
+    TYPE(c_funptr) :: a(:)
+    WRITE (0, *) 'in bar_fp1'
+    rank = 1
+    ctyp = "c_funptr"
+  END SUBROUTINE bar_fp1
+
+  SUBROUTINE bar_fpx(a, b)
+    TYPE(c_funptr) :: a(..)
+    TYPE(c_ptr)    :: b
+    WRITE (0, *) 'in bar_fpx'
+    rank = -1
+    ctyp = "c_funptr"
+  END SUBROUTINE bar_fpx
+END MODULE foo
+
+PROGRAM cptr_array_vs_scalar_arg
+  USE foo
+  USE iso_c_binding, only : c_ptr, c_loc, c_funptr
+  IMPLICIT NONE
+  INTEGER, TARGET :: i
+  TYPE(c_ptr)     :: a, b(1), c(1,1)
+  type(c_funptr)  :: fp, fp1(1), fp2(1,1)
+  a    = C_LOC(i)
+  b(1) = C_LOC(i)
+  CALL bar(a)
+  if (rank /= 0 .or. ctyp /= "c_ptr") stop 1
+  CALL bar(b)
+  if (rank /= 1 .or. ctyp /= "c_ptr") stop 2
+  CALL bar(c)
+  if (rank /= 2 .or. ctyp /= "c_ptr") stop 3
+  rank = -99
+  ctyp = ""
+  CALL bar((a))
+  if (rank /= 0 .or. ctyp /= "c_ptr") stop 4
+  CALL bar((b))
+  if (rank /= 1 .or. ctyp /= "c_ptr") stop 5
+  rank = -99
+  ctyp = ""
+  CALL bar(fp)
+  if (rank /= 0 .or. ctyp /= "c_funptr") stop 6
+  CALL bar(fp1)
+  if (rank /= 1 .or. ctyp /= "c_funptr") stop 7
+  rank = -99
+  ctyp = ""
+  CALL bar(fp2, a)
+  if (rank /= -1 .or. ctyp /= "c_funptr") stop 8
+END PROGRAM cptr_array_vs_scalar_arg
-- 
2.35.3