seq.c

kaffe是一个java虚拟机的源代码。里面包含了一些java例程和标准的java包。

/* seq.c
 * Pseudo instruction sequences.
 *
 * Copyright (c) 1996, 1997
 *	Transvirtual Technologies, Inc.  All rights reserved.
 *
 * See the file "license.terms" for information on usage and redistribution 
 * of this file. 
 */

#include "config.h"
#include "config-std.h"
#include "config-mem.h"
#include "gtypes.h"
#include "seq.h"
#include "gc.h"

sequence* firstSeq;
sequence* lastSeq;
sequence* currSeq;
sequence* activeSeq;

/*
 * Reset the sequence list.
 */
void
initSeq(void)
{
	currSeq = firstSeq;
}

/*
 * Allocate a new sequence element.
 */
sequence*
nextSeq(void)
{
	sequence* ret;

	ret = currSeq;
	if (ret == 0) {
		int i;
		/* Allocate chunk of sequence elements */
		ret = gc_malloc(ALLOCSEQNR * sizeof(sequence),
				GC_ALLOC_JITTEMP);

		/* Attach to current chain */
		if (lastSeq == 0) {
			firstSeq = ret;
		}
		else {
			lastSeq->next = ret;
		}
		lastSeq = &ret[ALLOCSEQNR-1];

		/* Link elements into list */
		for (i = 0; i < ALLOCSEQNR-1; i++) {
			ret[i].next = &ret[i+1];
		}
		ret[ALLOCSEQNR-1].next = 0;
	}
	currSeq = ret->next;
	ret->lastuse = 0;
	ret->refed = 1;
	activeSeq = ret;
	return (ret);
}