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[Patch, Fortran, committed] PR58579 - fix allocation of string temporaries: Avoid overallocation

In gfc_conv_string_tmp, gfortran allocates temporary strings. However, using "TYPE_SIZE (type)" didn't yield one byte as intended but 64 - which means that gfortran allocated 64 times as much memory as needed.

I wonder whether the same issue also occurs elsewhere.

Committed (Rev. ) after building and regtesting on x86-64-gnu-linux. I didn't see a simple way to generate a test case - but the dump of the PR's test case looks fine both for kind=1 and kind=4 strings.

Index: gcc/fortran/ChangeLog
--- gcc/fortran/ChangeLog	(Revision 203085)
+++ gcc/fortran/ChangeLog	(Arbeitskopie)
@@ -1,3 +1,9 @@
+2013-10-01  Tobias Burnus  <>
+	PR fortran/58579
+	* trans-expr.c (gfc_conv_string_tmp): Correctly obtain
+	the byte size of a single character.
 2013-09-27  Janne Blomqvist  <>
 	* intrinsic.texi (DATE_AND_TIME): Fix example.
Index: gcc/fortran/trans-expr.c
--- gcc/fortran/trans-expr.c	(Revision 203085)
+++ gcc/fortran/trans-expr.c	(Arbeitskopie)
@@ -2355,11 +2355,14 @@ gfc_conv_string_tmp (gfc_se * se, tree type, tree
       /* Allocate a temporary to hold the result.  */
       var = gfc_create_var (type, "pstr");
-      tmp = gfc_call_malloc (&se->pre, type,
-			     fold_build2_loc (input_location, MULT_EXPR,
-					      TREE_TYPE (len), len,
-					      fold_convert (TREE_TYPE (len),
-							    TYPE_SIZE (type))));
+      gcc_assert (POINTER_TYPE_P (type));
+      tmp = TREE_TYPE (type);
+      gcc_assert (TREE_CODE (tmp) == ARRAY_TYPE);
+      tmp = TYPE_SIZE_UNIT (TREE_TYPE (tmp));
+      tmp = fold_build2_loc (input_location, MULT_EXPR, size_type_node,
+			    fold_convert (size_type_node, len),
+			    fold_convert (size_type_node, tmp));
+      tmp = gfc_call_malloc (&se->pre, type, tmp);
       gfc_add_modify (&se->pre, var, tmp);
       /* Free the temporary afterwards.  */

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