Signed-off-by: Jose E. Marchesi <[email protected]>
gcc/ChangeLog
* algol68/a68-parser-serial-dsa.cc: New file.
---
gcc/algol68/a68-parser-serial-dsa.cc | 114 +++++++++++++++++++++++++++
1 file changed, 114 insertions(+)
create mode 100644 gcc/algol68/a68-parser-serial-dsa.cc
diff --git a/gcc/algol68/a68-parser-serial-dsa.cc
b/gcc/algol68/a68-parser-serial-dsa.cc
new file mode 100644
index 00000000000..b48c13da3bf
--- /dev/null
+++ b/gcc/algol68/a68-parser-serial-dsa.cc
@@ -0,0 +1,114 @@
+/* Check dynamic stack usage in serial clauses.
+ Copyright (C) 2025 Jose E. Marchesi.
+
+ Written by Jose E. Marchesi.
+
+ GCC is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3, or (at your option)
+ any later version.
+
+ GCC is distributed in the hope that it will be useful, but WITHOUT
+ ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
+ License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with GCC; see the file COPYING3. If not see
+ <http://www.gnu.org/licenses/>. */
+
+/* This file implements a phase that determines what serial clauses contain
+ phrases whose elaboration may involve dynamic stack allocation. It
+ annotates the SERIAL_CLAUSE parse nodes by setting the DYNAMIC_STACK_ALLOCS
+ flag. */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "options.h"
+
+#include "a68.h"
+
+/* Uncomment the following line for debugging traces. */
+/* #define SERIAL_DSA_DEBUG */
+
+static void
+serial_dsa_check_serial_clause (NODE_T *p, bool *dsa)
+{
+ for (; p != NO_NODE; FORWARD (p))
+ {
+ if (IS (p, GENERATOR))
+ {
+ /* LOC generators always result in dyamic stack allocation regardless
+ of the mode of the allocated value. */
+ if (IS (SUB (p), LOC_SYMBOL))
+ {
+#ifdef SERIAL_DSA_DEBUG
+ fprintf (stderr, "serial_dsa: %s:%d: loc generator implies DSA\n",
+ FILENAME (LINE (INFO (p))),
+ LINE_NUMBER (p));
+#endif
+ *dsa = true;
+ return;
+ }
+ }
+ else if (IS (p, DEFINING_IDENTIFIER))
+ {
+ /* Variable declarations of values with sample loc generators will
+ result in dynamic stack allocation.
+
+ Note that label declarations do no have a mode, so we have to
+ check for MOID (p). */
+
+ if (MOID (p) != NO_MOID && IS_REF (MOID (p)))
+ {
+ bool heap = HEAP (TAX (p)) == HEAP_SYMBOL;
+ if (HAS_ROWS (SUB (MOID (p))) && !heap)
+ {
+#ifdef SERIAL_DSA_DEBUG
+ fprintf (stderr,
+ "serial_dsa: %s:%d: defining identifier %s implies
DSA\n",
+ FILENAME (LINE (INFO (p))),
+ LINE_NUMBER (p),
+ NSYMBOL (p));
+#endif
+ *dsa = true;
+ return;
+ }
+ }
+ }
+ else
+ {
+ /* Inner serial clauses will take care of their own. Code in routine
+ texts will not impact the stack of the containing serial
+ clause. */
+ if (!IS (p, SERIAL_CLAUSE) && !IS (p, ROUTINE_TEXT))
+ serial_dsa_check_serial_clause (SUB (p), dsa);
+ }
+ }
+}
+
+void
+a68_serial_dsa (NODE_T *p)
+{
+ for (; p != NO_NODE; FORWARD (p))
+ {
+ a68_serial_dsa (SUB (p));
+ if (IS (p, SERIAL_CLAUSE))
+ {
+ bool dsa = false;
+ serial_dsa_check_serial_clause (SUB (p), &dsa);
+ DYNAMIC_STACK_ALLOCS (p) = dsa;
+#ifdef SERIAL_DSA_DEBUG
+ if (dsa)
+ {
+ fprintf (stderr, "serial_dsa: %s:%d: marking serial clause %p as
DSA\n",
+ FILENAME (LINE (INFO (p))),
+ LINE_NUMBER (p),
+ (void *) p);
+ }
+
+#endif
+ }
+ }
+}
--
2.30.2
