Algol 68 Genie

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 2001-2024 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  //! @section Synopsis
  23  //!
  24  //! Macros for stack checking.
  25  
  26  #if !defined (__A68G_STACK_H__)
  27  #define __A68G_STACK_H__
  28  
  29  // Macro's for stack checking. Since the stacks grow by small amounts at a time
  30  // (A68 rows are in the heap), we check the stacks only at certain points: where
  31  // A68 recursion may set in, or in the garbage collector. We check whether there
  32  // still is sufficient overhead to make it to the next check.
  33  
  34  #define TOO_COMPLEX "program too complex"
  35  
  36  #define SYSTEM_STACK_USED (ABS ((int) (A68 (system_stack_offset) - &stack_offset)))
  37  #define LOW_SYSTEM_STACK_ALERT(p) {\
  38    BYTE_T stack_offset;\
  39    if (A68 (stack_size) > 0 && SYSTEM_STACK_USED >= A68 (stack_limit)) {\
  40      if ((p) == NO_NODE) {\
  41        ABEND (A68_TRUE, TOO_COMPLEX, ERROR_STACK_OVERFLOW);\
  42      } else {\
  43        diagnostic (A68_RUNTIME_ERROR, (p), ERROR_STACK_OVERFLOW);\
  44        exit_genie ((p), A68_RUNTIME_ERROR);\
  45    }}}
  46  
  47  #define LOW_STACK_ALERT(p) {\
  48    LOW_SYSTEM_STACK_ALERT (p);\
  49    if ((p) != NO_NODE && (A68_FP >= A68 (frame_stack_limit) || A68_SP >= A68 (expr_stack_limit))) { \
  50      diagnostic (A68_RUNTIME_ERROR, (p), ERROR_STACK_OVERFLOW);\
  51      exit_genie ((p), A68_RUNTIME_ERROR);\
  52    }}
  53  
  54  #endif
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