[PATCH, committed] Fortran: fix FE memleak

[Harald Anlauf]

Dear all,

I've committed the attached, simple & obvious patch for a
gmp memory leak in gfc_get_nodesc_array_type that shows
up when running f951 under valgrind e.g. on testcase
gfortran.dg/class_optional_2.f90, after regtesting on
x86_64-pc-linux-gnu.

(Note that this does not address the underlying issues
of pr55978).

Thanks,
Harald


From 93c96e3ad0024a397115aa17bf29c7efc6b535a1 Mon Sep 17 00:00:00 2001
From: Harald Anlauf <anl...@gmx.de>
Date: Wed, 3 Jan 2024 20:21:00 +0100
Subject: [PATCH] Fortran: fix FE memleak

gcc/fortran/ChangeLog:

	* trans-types.cc (gfc_get_nodesc_array_type): Clear used gmp
	variables.
---
 gcc/fortran/trans-types.cc | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/gcc/fortran/trans-types.cc b/gcc/fortran/trans-types.cc
index e6db1c95450..676014e9b98 100644
--- a/gcc/fortran/trans-types.cc
+++ b/gcc/fortran/trans-types.cc
@@ -1795,7 +1795,7 @@ gfc_get_nodesc_array_type (tree etype, gfc_array_spec * as, gfc_packed packed,
 	  TYPE_LANG_SPECIFIC (type) = TYPE_LANG_SPECIFIC (TREE_TYPE (type));
 	}

-      return type;
+      goto array_type_done;
     }

   if (known_stride)
@@ -1814,10 +1814,6 @@ gfc_get_nodesc_array_type (tree etype, gfc_array_spec * as, gfc_packed packed,

   layout_type (type);

-  mpz_clear (offset);
-  mpz_clear (stride);
-  mpz_clear (delta);
-
   /* Represent packed arrays as multi-dimensional if they have rank >
      1 and with proper bounds, instead of flat arrays.  This makes for
      better debug info.  */
@@ -1848,6 +1844,12 @@ gfc_get_nodesc_array_type (tree etype, gfc_array_spec * as, gfc_packed packed,
       GFC_ARRAY_TYPE_P (type) = 1;
       TYPE_LANG_SPECIFIC (type) = TYPE_LANG_SPECIFIC (TREE_TYPE (type));
     }
+
+array_type_done:
+  mpz_clear (offset);
+  mpz_clear (stride);
+  mpz_clear (delta);
+
   return type;
 }

--
2.35.3