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Diffusion Ant (feature/nursery) Code

ant/include/gc.h
ddfe6237cab5feature/nursery

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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)
// Generational GC: Nursery configuration
#define NURSERY_SIZE_DEFAULT (8 * 1024 * 1024) // 8MB default nursery
#define NURSERY_SIZE_MIN (1 * 1024 * 1024) // 1MB minimum
#define NURSERY_SIZE_MAX (64 * 1024 * 1024) // 64MB maximum
// Use high bit of offset to distinguish nursery vs old gen
// Nursery offsets have bit 47 set (within 48-bit address space)
#define NURSERY_BIT (1ULL << 47)
#define NURSERY_OFF_MASK (~NURSERY_BIT)
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_OP_OFF void (*op_off)(void *ctx, jsoff_t *off)
#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
#define GC_OP_VALOFF_ARGS GC_OP_VAL, GC_OP_OFF, GC_CTX
void js_gc_maybe(ant_t *js);
void js_gc_throttle(bool enabled);
// Generational GC: Nursery operations
bool nursery_init(ant_t *js, size_t size);
void nursery_free(ant_t *js);
void nursery_scavenge(ant_t *js);
void nursery_enable(ant_t *js);
jsoff_t nursery_alloc(ant_t *js, size_t size);
// Generational GC: Remembered set operations
void rs_add(ant_t *js, jsval_t obj);
void rs_clear(ant_t *js);
// Nursery pointer detection
static inline bool is_nursery_off(jsoff_t off) {
return (off & NURSERY_BIT) != 0;
}
static inline jsoff_t nursery_raw_off(jsoff_t off) {
return off & NURSERY_OFF_MASK;
}
#endif

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