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gc.h
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1999-01-02
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4KB
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121 lines
/* -*-C-*-
$Id: gc.h,v 9.34 1999/01/02 06:11:34 cph Exp $
Copyright (c) 1987-1999 Massachusetts Institute of Technology
This program 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 2 of the License, or (at
your option) any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* Garbage collection related macros of sufficient utility to be
* included in all compilations.
*/
/* GC Types. */
#ifdef HAS_COMPILER_SUPPORT
#ifndef BAD_TYPES_LETHAL
#ifndef BAD_TYPES_INNOCUOUS
#define BAD_TYPES_INNOCUOUS
#endif /* BAD_TYPES_INNOCUOUS */
#endif /* BAD_TYPES_LETHAL */
#endif /* HAS_COMPILER_SUPPORT */
#ifdef BAD_TYPES_INNOCUOUS
#ifdef BAD_TYPES_LETHAL
#include "error: gc.h: BAD_TYPES both lethal and innocuous"
#endif /* BAD_TYPES_LETHAL */
#else /* not BAD_TYPES_INNOCUOUS */
#ifndef BAD_TYPES_LETHAL
#define BAD_TYPES_LETHAL
#endif /* BAD_TYPES_LETHAL */
#endif /* BAD_TYPES_INNOCUOUS */
#define GC_Non_Pointer 0
#define GC_Cell 1
#define GC_Pair 2
#define GC_Triple 3
#define GC_Hunk3 3
#define GC_Quadruple 4
#define GC_Hunk4 4
#define GC_Undefined -1 /* Undefined types */
#define GC_Special -2 /* Internal GC types */
#define GC_Vector -3
#define GC_Compiled -4
#ifdef BAD_TYPES_INNOCUOUS
#define INVALID_TYPE_CODE(TC) GC_Undefined
#else /* not BAD_TYPES_INNOCUOUS */
/* Some C compilers complain if the expression below does not yield
a value, and Microcode_Termination yields void.
*/
#define INVALID_TYPE_CODE(TC) \
(outf_fatal ("\nGC_Type_Code: Bad Type code = 0x%02x\n", TC), \
Microcode_Termination(TERM_INVALID_TYPE_CODE), \
GC_Undefined)
#endif /* BAD_TYPES_INNOCUOUS */
#define GC_Type_Code(TC) \
((GC_Type_Map[TC] != GC_Undefined) ? \
GC_Type_Map[TC] : \
(INVALID_TYPE_CODE(TC)))
#define GC_Type(Object) GC_Type_Code(OBJECT_TYPE (Object))
#define GC_Type_Non_Pointer(Object) (GC_Type(Object) == GC_Non_Pointer)
#define GC_Type_Cell(Object) (GC_Type(Object) == GC_Cell)
#define GC_Type_List(Object) (GC_Type(Object) == GC_Pair)
#define GC_Type_Triple(Object) (GC_Type(Object) == GC_Triple)
#define GC_Type_Quadruple(Object) (GC_Type(Object) == GC_Quadruple)
#define GC_Type_Undefined(Object) (GC_Type(Object) == GC_Undefined)
#define GC_Type_Special(Object) (GC_Type(Object) == GC_Special)
#define GC_Type_Vector(Object) (GC_Type(Object) == GC_Vector)
#define GC_Type_Compiled(Object) (GC_Type(Object) == GC_Compiled)
/* Overflow detection, various cases */
#define GC_ENABLED_P() (INTERRUPT_ENABLED_P (INT_GC))
#define GC_Check(Amount) \
(((Amount + Free) >= MemTop) && (GC_ENABLED_P ()))
#define Space_Before_GC() \
((GC_ENABLED_P ()) \
? ((Free <= MemTop) ? (MemTop - Free) : 0) \
: (Heap_Top - Free))
#define Request_GC(Amount) \
{ \
REQUEST_INTERRUPT (INT_GC); \
GC_Space_Needed = Amount; \
}
#define SET_MEMTOP(addr) \
{ \
MemTop = (addr); \
COMPILER_SETUP_INTERRUPT (); \
}
#define SET_STACK_GUARD(addr) \
{ \
Stack_Guard = (addr); \
COMPILER_SETUP_INTERRUPT (); \
}