roots.c
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roots.c
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	#include "ant.h"
	#include "gc.h"
	#include "arena.h"
	#include "internal.h"

	jshdl_t js_root(struct js *js, jsval_t val) {
	if (js->gc_roots_len >= js->gc_roots_cap) {
	int new_cap = js->gc_roots_cap ? js->gc_roots_cap * 2 : GC_ROOTS_INITIAL_CAP;
	jsval_t new_roots = ant_realloc(js->gc_roots, new_cap sizeof(jsval_t));
	if (!new_roots) {
	fprintf(stderr, "FATAL: Out of memory allocating GC roots\n");
	abort();
	}
	js->gc_roots = new_roots;
	js->gc_roots_cap = new_cap;
	}
	int idx = js->gc_roots_len++;
	js->gc_roots[idx] = val;
	return idx;
	}

	jsval_t js_deref(struct js *js, jshdl_t h) {
	if (h < 0 \|\| h >= js->gc_roots_len) return js_mkundef();
	return js->gc_roots[h];
	}

	void js_unroot(struct js *js, jshdl_t h) {
	if (h >= 0 && h == js->gc_roots_len - 1) js->gc_roots_len--;
	}

	void js_root_update(struct js *js, jshdl_t h, jsval_t val) {
	if (h >= 0 && h < js->gc_roots_len) js->gc_roots[h] = val;
	}