rooting

roots.h
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			#ifndef ROOTS_H
			#define ROOTS_H

			#include "types.h"

			jshdl_t js_root(struct js *js, jsval_t val);
			jsval_t js_deref(struct js *js, jshdl_t h);

			void js_unroot(struct js *js, jshdl_t h);
			void js_root_update(struct js *js, jshdl_t h, jsval_t val);

			typedef struct {
			struct js *js;
			jshdl_t h;
			} rooted_handle_t;

			static inline void _rooted_cleanup(rooted_handle_t *r) {
			if (r->h) js_unroot(r->js, r->h);
			}

			#define ROOTED(name, val) \
			jsval_t name = (val); \
			rooted_handle_t name##_r __attribute__((cleanup(_rooted_cleanup))) = {js, js_root(js, name)}

			#define ROOT_UPDATE(name, val) do { \
			name = (val); \
			js_root_update(js, name##_r.h, name); \
			} while(0)

			#define ROOT_SYNC(name) (name = js_deref(js, name##_r.h))

			#endif