a68g-stack.h
1 //! @file a68g-stack.h
2 //! @author J. Marcel van der Veer
3 //!
4 //! @section Copyright
5 //!
6 //! This file is part of Algol68G - an Algol 68 compiler-interpreter.
7 //! Copyright 2001-2023 J. Marcel van der Veer [algol68g@xs4all.nl].
8 //!
9 //! @section License
10 //!
11 //! This program is free software; you can redistribute it and/or modify it
12 //! under the terms of the GNU General Public License as published by the
13 //! Free Software Foundation; either version 3 of the License, or
14 //! (at your option) any later version.
15 //!
16 //! This program is distributed in the hope that it will be useful, but
17 //! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
18 //! or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
19 //! more details. You should have received a copy of the GNU General Public
20 //! License along with this program. If not, see [http://www.gnu.org/licenses/].
21
22 #if !defined (__A68G_STACK_H__)
23 #define __A68G_STACK_H__
24
25 // Macro's for stack checking. Since the stacks grow by small amounts at a time
26 // (A68 rows are in the heap), we check the stacks only at certain points: where
27 // A68 recursion may set in, or in the garbage collector. We check whether there
28 // still is sufficient overhead to make it to the next check.
29
30 #define TOO_COMPLEX "program too complex"
31
32 #define SYSTEM_STACK_USED (ABS ((int) (A68 (system_stack_offset) - &stack_offset)))
33 #define LOW_SYSTEM_STACK_ALERT(p) {\
34 BYTE_T stack_offset;\
35 if (A68 (stack_size) > 0 && SYSTEM_STACK_USED >= A68 (stack_limit)) {\
36 if ((p) == NO_NODE) {\
37 ABEND (A68_TRUE, TOO_COMPLEX, ERROR_STACK_OVERFLOW);\
38 } else {\
39 diagnostic (A68_RUNTIME_ERROR, (p), ERROR_STACK_OVERFLOW);\
40 exit_genie ((p), A68_RUNTIME_ERROR);\
41 }}}
42
43 #define LOW_STACK_ALERT(p) {\
44 LOW_SYSTEM_STACK_ALERT (p);\
45 if ((p) != NO_NODE && (A68_FP >= A68 (frame_stack_limit) || A68_SP >= A68 (expr_stack_limit))) { \
46 diagnostic (A68_RUNTIME_ERROR, (p), ERROR_STACK_OVERFLOW);\
47 exit_genie ((p), A68_RUNTIME_ERROR);\
48 }}
49
50 #endif
