gc.h

#ifndef _EMERALD_GC_H
#define _EMERALD_GC_H

/*
 * This defines the interface to the garbage collector, a generational
 * copying collector with a stable copying oldspace cleaner.  Stable means
 * that the space held by live objects will not be overwritten during the
 * garbage collection.
 */

#ifndef _EMERALD_TYPES_H
#include "types.h"
#endif

#define WORDS_TO_BYTES(x)   (((int)(x))<<2)
#define BYTES_TO_WORDS(x)   (((int)(x))>>2)

typedef unsigned int word;

#define INITIAL_MOVE_STACK_SIZE 1000

Object *move_stack;
extern int move_stack_size;

extern int heapsize;		/* Heap size in bytes */

/****************************
 *
 *   Objects                
 *
 ****************************/

/*
 * The garbage collector allocates an additional word at the front of each
 * object to store its age.  This field is also used for indicating (by an
 * illegal age of -2) that an object has been moved and the next word is a
 * forwarding pointer.
 */

#define OLD 34
#define NEW 128

extern Object *rem_set;
extern int remNum;

#define REM_INCR  (10240)
#define PTR 0
#define VEC 1

extern int stack_top, stack_bottom;

extern int bytesInThisGeneration;
extern int bytesPerGeneration;
extern int currentAge;
extern int copyCount;

extern int old_size;
extern Object createStub(ConcreteType ct, void *stub, OID oid);

extern int inhibit_gc;
extern void ensureSpace(int howmanybytes);
extern void anticipateGC(int howmanybytes);
extern void new_rem_set(Object);
extern void recordSize(Object, int);
extern int wasGCMalloced(void *addr);
extern void doToNewGeneration(void (*f)(Object), void (*cleanup)(void));
extern void doToOldGeneration(void (*f)(Object), word *limit);
extern void doToExternalRoots(void (*pointers_f)(int, Object *), 
		       void (*variable_f)(Object *, ConcreteType *),
		       void (*variables_f)(int, Bits32 *),
		       int destructive,
		       int doFromObjectTable);
extern void push_ms (Object p);
extern int varContainsPointer(ConcreteType ct);

extern unsigned distGCBitToSend(Object o);
extern unsigned distGCSeq, lastCompletedDistGCSeq;
extern int inDistGC(void);
extern void startDistGC(void);
extern void restartDistGC(int);
extern void newGrey(Object);
extern int isGrey(Object);
extern void unavailableObject(Object);
extern void incomingRef(Object, int);
extern void incomingObject(Object);
extern void distGCFreeState(struct State *);
#endif