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Re: [RFC] NEWUNIT preliminary patch


Jerry DeLisle wrote:
Hi,

The attached patches are provided for your review, comment, and testing. I manually cut some hunks out of the front end patch from another patch, so I expect some fuzz when applying this. (newunit1 is library side. newunit2 is front-end)

Ooops!

I left off a hunk for libgfortran.h. Replace the newunit1.diff patch from the previous post with the one attached.

Tobias, I will start adding in the constraints.

Regards,

Jerry


Index: libgfortran.h
===================================================================
--- libgfortran.h	(revision 147834)
+++ libgfortran.h	(working copy)
@@ -590,6 +590,7 @@ st_parameter_common;
 #define IOPARM_OPEN_HAS_ROUND		(1 << 20)
 #define IOPARM_OPEN_HAS_SIGN		(1 << 21)
 #define IOPARM_OPEN_HAS_ASYNCHRONOUS	(1 << 22)
+#define IOPARM_OPEN_HAS_NEWUNIT		(1 << 23)
 
 /* library start function and end macro.  These can be expanded if needed
    in the future.  cmp is st_parameter_common *cmp  */
Index: io/open.c
===================================================================
--- io/open.c	(revision 147834)
+++ io/open.c	(working copy)
@@ -814,7 +814,7 @@ st_open (st_parameter_open *opp)
 
   flags.convert = conv;
 
-  if (opp->common.unit < 0)
+  if (!(opp->common.flags & IOPARM_OPEN_HAS_NEWUNIT) && opp->common.unit < 0)
     generate_error (&opp->common, LIBERROR_BAD_OPTION,
 		    "Bad unit number in OPEN statement");
 
@@ -842,8 +842,13 @@ st_open (st_parameter_open *opp)
 
   if ((opp->common.flags & IOPARM_LIBRETURN_MASK) == IOPARM_LIBRETURN_OK)
     {
-      u = find_or_create_unit (opp->common.unit);
+      if ((opp->common.flags & IOPARM_OPEN_HAS_NEWUNIT))
+	{
+	  *opp->newunit = get_unique_unit_number(opp);
+	  opp->common.unit = *opp->newunit;
+	}
 
+      u = find_or_create_unit (opp->common.unit);
       if (u->s == NULL)
 	{
 	  u = new_unit (opp, u, &flags);
Index: io/io.h
===================================================================
--- io/io.h	(revision 147834)
+++ io/io.h	(working copy)
@@ -297,6 +297,7 @@ typedef struct
   CHARACTER2 (round);
   CHARACTER1 (sign);
   CHARACTER2 (asynchronous);
+  GFC_INTEGER_4 *newunit;
 }
 st_parameter_open;
 
@@ -794,6 +795,10 @@ internal_proto(unpack_filename);
 extern gfc_offset max_offset;
 internal_proto(max_offset);
 
+/* Unit number to be assigned when NEWUNIT is used in an OPEN statement.  */
+extern GFC_INTEGER_4 next_available_newunit;
+internal_proto(next_available_newunit);
+
 /* Unit tree root.  */
 extern gfc_unit *unit_root;
 internal_proto(unit_root);
@@ -831,6 +836,9 @@ internal_proto (finish_last_advance_reco
 extern int unit_truncate (gfc_unit *, gfc_offset, st_parameter_common *);
 internal_proto (unit_truncate);
 
+extern int get_unique_unit_number (st_parameter_open *);
+internal_proto(get_unique_unit_number);
+
 /* open.c */
 
 extern gfc_unit *new_unit (st_parameter_open *, gfc_unit *, unit_flags *);
Index: io/unit.c
===================================================================
--- io/unit.c	(revision 147834)
+++ io/unit.c	(working copy)
@@ -67,6 +67,8 @@ see the files COPYING3 and COPYING.RUNTI
 
 /* Subroutines related to units */
 
+int next_available_newunit;
+#define GFC_FIRST_NEWUNIT -10
 
 #define CACHE_SIZE 3
 static gfc_unit *unit_cache[CACHE_SIZE];
@@ -131,7 +133,6 @@ rotate_right (gfc_unit * t)
 }
 
 
-
 static int
 compare (int a, int b)
 {
@@ -480,7 +481,7 @@ free_internal_unit (st_parameter_dt *dtp
 
 
 /* get_unit()-- Returns the unit structure associated with the integer
- * unit or the internal file. */
+   unit or the internal file.  */
 
 gfc_unit *
 get_unit (st_parameter_dt *dtp, int do_create)
@@ -489,7 +490,7 @@ get_unit (st_parameter_dt *dtp, int do_c
   if ((dtp->common.flags & IOPARM_DT_HAS_INTERNAL_UNIT) != 0)
     return get_internal_unit(dtp);
 
-  /* Has to be an external unit */
+  /* Has to be an external unit.  */
 
   dtp->u.p.unit_is_internal = 0;
   dtp->internal_unit_desc = NULL;
@@ -499,7 +500,7 @@ get_unit (st_parameter_dt *dtp, int do_c
 
 
 /*************************/
-/* Initialize everything */
+/* Initialize everything.  */
 
 void
 init_units (void)
@@ -511,6 +512,8 @@ init_units (void)
   __GTHREAD_MUTEX_INIT_FUNCTION (&unit_lock);
 #endif
 
+  next_available_newunit = GFC_FIRST_NEWUNIT;
+
   if (options.stdin_unit >= 0)
     {				/* STDIN */
       u = insert_unit (options.stdin_unit);
@@ -601,10 +604,8 @@ init_units (void)
     }
 
   /* Calculate the maximum file offset in a portable manner.
-   * max will be the largest signed number for the type gfc_offset.
-   *
-   * set a 1 in the LSB and keep a running sum, stopping at MSB-1 bit. */
-
+     max will be the largest signed number for the type gfc_offset.
+     set a 1 in the LSB and keep a running sum, stopping at MSB-1 bit.  */
   max_offset = 0;
   for (i = 0; i < sizeof (max_offset) * 8 - 1; i++)
     max_offset = max_offset + ((gfc_offset) 1 << i);
@@ -663,8 +664,8 @@ unlock_unit (gfc_unit *u)
 }
 
 /* close_unit()-- Close a unit.  The stream is closed, and any memory
- * associated with the stream is freed.  Returns nonzero on I/O error.
- * Should be called with the u->lock locked. */
+   associated with the stream is freed.  Returns nonzero on I/O error.
+   Should be called with the u->lock locked. */
 
 int
 close_unit (gfc_unit *u)
@@ -674,11 +675,11 @@ close_unit (gfc_unit *u)
 
 
 /* close_units()-- Delete units on completion.  We just keep deleting
- * the root of the treap until there is nothing left.
- * Not sure what to do with locking here.  Some other thread might be
- * holding some unit's lock and perhaps hold it indefinitely
- * (e.g. waiting for input from some pipe) and close_units shouldn't
- * delay the program too much.  */
+   the root of the treap until there is nothing left.
+   Not sure what to do with locking here.  Some other thread might be
+   holding some unit's lock and perhaps hold it indefinitely
+   (e.g. waiting for input from some pipe) and close_units shouldn't
+   delay the program too much.  */
 
 void
 close_units (void)
@@ -813,3 +814,22 @@ finish_last_advance_record (gfc_unit *u)
   fbuf_flush (u, u->mode);
 }
 
+/* Assign a negative number for NEWUNIT in OPEN statements.  */
+GFC_INTEGER_4
+get_unique_unit_number (st_parameter_open *opp)
+{
+  GFC_INTEGER_4 num;
+
+  __gthread_mutex_lock (&unit_lock);
+  num = next_available_newunit--;
+
+  /* Do not allow NEWUNIT numbers to wrap.  */
+  if (next_available_newunit >=  GFC_FIRST_NEWUNIT )
+    {
+      __gthread_mutex_unlock (&unit_lock);
+      generate_error (&opp->common, LIBERROR_INTERNAL, "NEWUNIT exhausted");
+      return 0;
+    }
+  __gthread_mutex_unlock (&unit_lock);
+  return num;
+}
Index: io/transfer.c
===================================================================
--- io/transfer.c	(revision 147834)
+++ io/transfer.c	(working copy)
@@ -2020,7 +2020,7 @@ data_transfer_init (st_parameter_dt *dtp
 	close_unit (dtp->u.p.current_unit);
 	dtp->u.p.current_unit = NULL;
 	generate_error (&dtp->common, LIBERROR_BAD_OPTION,
-			"Bad unit number in OPEN statement");
+			"Bad unit number in statement");
 	return;
       }
     memset (&u_flags, '\0', sizeof (u_flags));
Index: io/format.c
===================================================================
--- io/format.c	(revision 147834)
+++ io/format.c	(working copy)
@@ -919,13 +919,21 @@ parse_format_list (st_parameter_dt *dtp)
 
       tail->u.real.d = fmt->value;
 
-      if (t == FMT_D || t == FMT_F)
+      if (t == FMT_F)
 	break;
 
       tail->u.real.e = -1;
 
       /* Look for optional exponent */
+      t2 = t;
       t = format_lex (fmt);
+
+      if (t2 == FMT_D && t == FMT_E)
+        {
+	  fmt->error = "Exponent width not allowed with D specifier in format";
+	  goto finished;
+	}
+
       if (t != FMT_E)
 	fmt->saved_token = t;
       else

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