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/* 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
}
}
}
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