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/*
 * common/talloc.c
 * C compiler common library.
 * Tree space sub-allocator.
 */

#ifdef   vax
#include "INC$LIB:cc0.h"
#else
#include "cc0.h"
#endif

/*
 * Tree space management.
 */
struct tree_space {
	struct tree_space *ts_link;
	char *ts_ptr;
	char *ts_end;
	char ts_base[];
} *ts_bp, *ts_cp;
int ts_size;

/*
 * Allocate some space from the tree area.
 * Always allocate the size of a tree node,
 * the other uses are too few and far between
 * to bother with.
 * Abort the compiler if no space to get.
 * To make life a lot easier for the rest of the world,
 * tree space is zeroed.
 */
extern char *malloc();
char *talloc()
{
	register char *p;
	register int n;

	n = ts_size;
	if (ts_cp->ts_ptr == ts_cp->ts_end) {
	    if (ts_cp->ts_link == NULL) {
		if ((ts_cp->ts_link = malloc(sizeof(*ts_bp)+n*128)) == NULL)
		    cfatal("out of space in tree node allocator");
		ts_cp->ts_link->ts_link = NULL;
	    }
	    ts_cp = ts_cp->ts_link;
	    ts_cp->ts_ptr = ts_cp->ts_base;
	    ts_cp->ts_end = ts_cp->ts_base+n*128;
	}
	p = ts_cp->ts_ptr += n;
	while (--n >= 0) *--p = 0;
	return (p);
}

/*
 * Clear tree space.
 * If tsize == ts_size then reset the tree allocator.
 * If tsize != ts_size then free all space allocated
 * and if tsize != 0 then reallocate with new granularity.
 * tsize is the size of the tree nodes allocated.
 */
newtree(tsize) int tsize;
{
	if (tsize != ts_size) {
		while (ts_bp != NULL) {
			ts_cp = ts_bp;
			ts_bp = ts_bp->ts_link;
			free(ts_cp);
		}
		if (ts_size = tsize) {
		    if ((ts_bp = malloc(sizeof(*ts_bp) + ts_size*128)) == NULL)
			cfatal("no space in tree allocator");
		    ts_bp->ts_link = NULL;
		} else {
		    ts_bp = NULL;
		}
	}
	if (ts_cp = ts_bp) {
		ts_cp->ts_ptr = ts_cp->ts_base;
		ts_cp->ts_end = ts_cp->ts_base+ts_size*128;
	}
}

/*
 * Reset tree space to saved location.
 * Used to parse #if expressions in mid-expression.
 */
treset(p) char *p;
{
	for (ts_cp = ts_bp; ts_cp != NULL; ts_cp = ts_cp->ts_link)
		if (ts_cp->ts_base <= p && p <= ts_cp->ts_end)
			break;
	if (ts_cp == NULL) cbotch("tree reset");
	ts_cp->ts_ptr = p;
}

#if	OVERLAID
/*
 * Free all of the tree nodes.
 */
freetree()
{
	newtree(0);
}
#endif

/* end of common/talloc.c */

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