rooting

gc.h
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			#ifndef GC_H
			#define GC_H

			#include <types.h>
			#include <stddef.h>

			#define ROPE_FLAG (1ULL << 63)
			#define ROPE_DEPTH_SHIFT 56
			#define ROPE_DEPTH_MASK 0x7FULL
			#define ROPE_MAX_DEPTH 64
			#define ROPE_FLATTEN_THRESHOLD (32 * 1024)

			typedef struct {
			jsoff_t header;
			jsval_t left;
			jsval_t right;
			jsval_t cached;
			} rope_node_t;

			#define GC_FWD_LOAD_FACTOR 70
			#define GC_ROOTS_INITIAL_CAP 32
			#define GC_CB(ret, name, arg) ret (name)(void ctx, arg old)

			size_t js_gc_compact(ant_t *js);

			#define GC_CTX void *ctx
			#define GC_FWD_OFF GC_CB(jsoff_t, fwd_off, jsoff_t)
			#define GC_FWD_VAL GC_CB(jsval_t, fwd_val, jsval_t)
			#define GC_WEAK_OFF GC_CB(jsoff_t, weak_off, jsoff_t)
			#define GC_OP_VAL void (op_val)(void ctx, jsval_t *val)

			#define GC_FWD_ARGS GC_FWD_VAL, GC_CTX
			#define GC_RESERVE_ARGS ant_t *js, GC_FWD_OFF, GC_FWD_ARGS
			#define GC_UPDATE_ARGS ant_t *js, GC_FWD_OFF, GC_WEAK_OFF, GC_FWD_ARGS
			#define GC_OP_VAL_ARGS GC_OP_VAL, GC_CTX

			void js_gc_maybe(ant_t *js);
			void js_gc_throttle(bool enabled);

			#endif