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(* SysStorage.mod provides dynamic allocation for the system components.
Copyright (C) 2001-2023 Free Software Foundation, Inc.
Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.
This file is part of GNU Modula-2.
GNU Modula-2 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.
GNU Modula-2 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.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. *)
IMPLEMENTATION MODULE SysStorage ;
FROM libc IMPORT malloc, free, realloc, memset, getenv, printf ;
FROM Debug IMPORT Halt ;
FROM SYSTEM IMPORT ADR ;
CONST
enableDeallocation = TRUE ;
enableZero = TRUE ;
enableTrace = FALSE ;
VAR
callno: CARDINAL ;
zero,
trace : BOOLEAN ;
PROCEDURE ALLOCATE (VAR a: ADDRESS ; size: CARDINAL) ;
BEGIN
a := malloc (size) ;
IF a = NIL
THEN
Halt ('out of memory error',
__FILE__, __FUNCTION__, __LINE__)
END ;
IF enableTrace AND trace
THEN
printf ("<DEBUG-CALL> %d SysStorage.ALLOCATE (0x%x, %d bytes)\n", callno, a, size) ;
printf ("<MEM-ALLOC> %ld %d\n", a, size);
INC (callno)
END
END ALLOCATE ;
PROCEDURE DEALLOCATE (VAR a: ADDRESS; size: CARDINAL);
BEGIN
IF enableTrace AND trace
THEN
printf ("<DEBUG-CALL> %d SysStorage.DEALLOCATE (0x%x, %d bytes)\n", callno, a, size) ;
INC (callno)
END ;
IF enableZero AND zero
THEN
IF enableTrace AND trace
THEN
printf (" memset (0x%x, 0, %d bytes)\n", a, size)
END ;
IF memset (a, 0, size) # a
THEN
Halt ('memset should have returned the first parameter',
__FILE__, __FUNCTION__, __LINE__)
END
END ;
IF enableDeallocation
THEN
IF enableTrace AND trace
THEN
printf (" free (0x%x) %d bytes\n", a, size) ;
printf ("<MEM-FREE> %ld %d\n", a, size);
END ;
free (a)
END ;
a := NIL
END DEALLOCATE ;
(*
REALLOCATE - attempts to reallocate storage. The address,
a, should either be NIL in which case ALLOCATE
is called, or alternatively it should have already
been initialized by ALLOCATE. The allocated storage
is resized accordingly.
*)
PROCEDURE REALLOCATE (VAR a: ADDRESS; size: CARDINAL) ;
BEGIN
IF a = NIL
THEN
ALLOCATE (a, size)
ELSE
IF enableTrace AND trace
THEN
printf ("<DEBUG-CALL> %d SysStorage.REALLOCATE (0x%x, %d bytes)\n", callno, a, size) ;
INC (callno)
END ;
IF enableTrace AND trace
THEN
printf (" realloc (0x%x, %d bytes) -> ", a, size) ;
printf ("<MEM-FREE> %ld %d\n", a, size)
END ;
a := realloc (a, size) ;
IF a = NIL
THEN
Halt ('out of memory error',
__FILE__, __FUNCTION__, __LINE__)
END ;
IF enableTrace AND trace
THEN
printf ("<MEM-ALLOC> %ld %d\n", a, size) ;
printf (" 0x%x %d bytes\n", a, size)
END
END
END REALLOCATE ;
PROCEDURE Available (size: CARDINAL) : BOOLEAN;
VAR
a: ADDRESS ;
BEGIN
IF enableTrace AND trace
THEN
printf ("<DEBUG-CALL> %d SysStorage.Available (%d bytes)\n", callno, size) ;
INC (callno)
END ;
a := malloc (size) ;
IF a = NIL
THEN
IF enableTrace AND trace
THEN
printf (" no\n", size)
END ;
RETURN FALSE
ELSE
IF enableTrace AND trace
THEN
printf (" yes\n", size)
END ;
free (a) ;
RETURN TRUE
END
END Available ;
(*
Init - initializes the heap. This does nothing on a GNU/Linux system.
But it remains here since it might be used in an embedded system.
*)
PROCEDURE Init ;
END Init ;
BEGIN
callno := 0 ;
IF enableTrace
THEN
trace := getenv (ADR ("M2DEBUG_SYSSTORAGE_trace")) # NIL
ELSE
trace := FALSE
END ;
IF enableZero
THEN
zero := getenv (ADR ("M2DEBUG_SYSSTORAGE_zero")) # NIL
ELSE
zero := FALSE
END
END SysStorage.
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