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ant/src/shapes.c
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shapes.c
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#include "shapes.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <uthash.h>
uint32_t ant_ic_epoch_counter = 1;
#define SHAPE_ENTRY_SIZE sizeof(shape_index_entry_t)
#define SHAPE_ENTRY_POOL_MAX 1024
static size_t g_shape_bytes = 0;
static size_t g_shape_entry_pool_len = 0;
static void *g_shape_entry_pool = NULL;
typedef struct shape_index_entry {
uint64_t key;
uint32_t slot;
UT_hash_handle hh;
} shape_index_entry_t;
typedef struct shape_child_entry {
uint64_t key;
ant_shape_t *child;
UT_hash_handle hh;
} shape_child_entry_t;
_Static_assert(
sizeof(shape_index_entry_t) == sizeof(shape_child_entry_t),
"entry pool requires index and child entries to be the same size"
);
static inline void *shape_entry_alloc(void) {
if (g_shape_entry_pool) {
void *p = g_shape_entry_pool;
g_shape_entry_pool = *(void **)p;
g_shape_entry_pool_len--;
memset(p, 0, SHAPE_ENTRY_SIZE);
return p;
}
return calloc(1, SHAPE_ENTRY_SIZE);
}
static inline void shape_entry_free(void *p) {
if (!p) return;
if (g_shape_entry_pool_len < SHAPE_ENTRY_POOL_MAX) {
*(void **)p = g_shape_entry_pool;
g_shape_entry_pool = p;
g_shape_entry_pool_len++;
} else free(p);
}
static inline void shape_entry_pool_trim(void) {
size_t keep = g_shape_entry_pool_len / 2;
while (g_shape_entry_pool_len > keep) {
void *p = g_shape_entry_pool;
g_shape_entry_pool = *(void **)p;
g_shape_entry_pool_len--;
free(p);
}
}
struct ant_shape {
uint32_t ref_count;
uint32_t count;
uint32_t cap;
uint8_t inobj_limit;
uint16_t gc_mark;
ant_shape_prop_t *props;
shape_index_entry_t *index;
shape_child_entry_t *children;
ant_shape_t *parent;
uint64_t parent_key;
};
static ant_shape_t *g_root_shapes[ANT_INOBJ_MAX_SLOTS + 1];
static inline uint8_t shape_clamp_inobj_limit(uint8_t limit) {
return (limit > ANT_INOBJ_MAX_SLOTS) ? (uint8_t)ANT_INOBJ_MAX_SLOTS : limit;
}
static uint64_t shape_key_interned(const char *interned) {
return ((uint64_t)(uintptr_t)interned << 1);
}
static uint64_t shape_key_symbol(ant_offset_t sym_off) {
return ((uint64_t)sym_off << 1) | 1u;
}
static uint64_t shape_child_key(uint64_t prop_key, uint8_t attrs) {
return prop_key ^ ((uint64_t)attrs << 56);
}
static shape_index_entry_t *shape_lookup(const ant_shape_t *shape, uint64_t key) {
if (!shape) return NULL;
shape_index_entry_t *entry = NULL;
HASH_FIND(hh, shape->index, &key, sizeof(key), entry);
return entry;
}
static bool shape_rebuild_index(ant_shape_t *shape) {
if (!shape) return false;
shape_index_entry_t *entry, *tmp;
HASH_ITER(hh, shape->index, entry, tmp) {
HASH_DEL(shape->index, entry);
shape_entry_free(entry);
}
shape->index = NULL;
for (uint32_t i = 0; i < shape->count; i++) {
const ant_shape_prop_t *prop = &shape->props[i];
uint64_t key = (prop->type == ANT_SHAPE_KEY_SYMBOL)
? shape_key_symbol(prop->key.sym_off)
: shape_key_interned(prop->key.interned);
shape_index_entry_t *idx = shape_entry_alloc();
if (!idx) return false;
g_shape_bytes += sizeof(*idx);
idx->key = key; idx->slot = i;
HASH_ADD(hh, shape->index, key, sizeof(key), idx);
}
return true;
}
static bool shape_ensure_capacity(ant_shape_t *shape, uint32_t needed) {
if (!shape) return false;
if (needed <= shape->cap) return true;
uint32_t new_cap = shape->cap ? shape->cap * 2 : 8;
while (new_cap < needed) new_cap *= 2;
ant_shape_prop_t *next = realloc(shape->props, sizeof(*next) * new_cap);
if (!next) return false;
g_shape_bytes += (new_cap - shape->cap) * sizeof(*next);
shape->props = next;
shape->cap = new_cap;
return true;
}
static bool shape_add_key(
ant_shape_t *shape,
ant_shape_key_type_t type,
const char *interned,
ant_offset_t sym_off,
uint8_t attrs,
uint32_t *out_slot
) {
if (!shape) return false;
uint64_t key = (type == ANT_SHAPE_KEY_SYMBOL)
? shape_key_symbol(sym_off)
: shape_key_interned(interned);
shape_index_entry_t *found = shape_lookup(shape, key);
if (found) {
shape->props[found->slot].attrs = attrs;
ant_ic_epoch_bump();
if (out_slot) *out_slot = found->slot;
return true;
}
if (!shape_ensure_capacity(shape, shape->count + 1)) return false;
uint32_t slot = shape->count++;
ant_shape_prop_t *prop = &shape->props[slot];
prop->type = type;
prop->attrs = attrs;
prop->has_getter = 0;
prop->has_setter = 0;
prop->getter = 0;
prop->setter = 0;
if (type == ANT_SHAPE_KEY_SYMBOL) prop->key.sym_off = sym_off;
else prop->key.interned = interned;
shape_index_entry_t *idx = shape_entry_alloc();
if (!idx) return false;
g_shape_bytes += sizeof(*idx);
idx->key = key; idx->slot = slot;
HASH_ADD(hh, shape->index, key, sizeof(key), idx);
if (out_slot) *out_slot = slot;
return true;
}
static ant_shape_t *shape_find_child(ant_shape_t *shape, uint64_t ckey) {
if (!shape || !shape->children) return NULL;
shape_child_entry_t *entry = NULL;
HASH_FIND(hh, shape->children, &ckey, sizeof(ckey), entry);
return entry ? entry->child : NULL;
}
static void shape_record_child(ant_shape_t *parent, uint64_t ckey, ant_shape_t *child) {
shape_child_entry_t *existing = NULL;
HASH_FIND(hh, parent->children, &ckey, sizeof(ckey), existing);
if (existing) return;
shape_child_entry_t *entry = shape_entry_alloc();
if (!entry) return;
entry->key = ckey;
entry->child = child;
ant_shape_retain(child);
HASH_ADD(hh, parent->children, key, sizeof(entry->key), entry);
child->parent = parent;
child->parent_key = ckey;
}
static inline bool shape_is_in_tree(const ant_shape_t *shape) {
return shape && (shape->ref_count > 1 || shape->parent != NULL);
}
bool ant_shape_add_interned_tr(ant_shape_t **shape_pp, const char *interned, uint8_t attrs, uint32_t *out_slot) {
ant_shape_t *shape = *shape_pp;
if (!shape) return false;
if (!shape_is_in_tree(shape)) {
return shape_add_key(shape, ANT_SHAPE_KEY_STRING, interned, 0, attrs, out_slot);
}
uint64_t prop_key = shape_key_interned(interned);
uint64_t ckey = shape_child_key(prop_key, attrs);
ant_shape_t *child = shape_find_child(shape, ckey);
if (child) {
int32_t slot = ant_shape_lookup_interned(child, interned);
if (slot >= 0) {
if (out_slot) *out_slot = (uint32_t)slot;
ant_shape_retain(child); ant_shape_release(shape);
*shape_pp = child; return true;
}
}
ant_shape_t *shared = ant_shape_clone(shape);
if (!shared) return false;
if (!shape_add_key(shared, ANT_SHAPE_KEY_STRING, interned, 0, attrs, out_slot)) {
ant_shape_release(shared);
return false;
}
shape_record_child(shape, ckey, shared);
ant_shape_release(shared);
ant_shape_t *next = ant_shape_clone(shared);
if (!next) return false;
ant_shape_release(shape);
*shape_pp = next;
return true;
}
bool ant_shape_add_symbol_tr(ant_shape_t **shape_pp, ant_offset_t sym_off, uint8_t attrs, uint32_t *out_slot) {
ant_shape_t *shape = *shape_pp;
if (!shape) return false;
if (!shape_is_in_tree(shape)) {
return shape_add_key(shape, ANT_SHAPE_KEY_SYMBOL, NULL, sym_off, attrs, out_slot);
}
uint64_t prop_key = shape_key_symbol(sym_off);
uint64_t ckey = shape_child_key(prop_key, attrs);
ant_shape_t *child = shape_find_child(shape, ckey);
if (child) {
int32_t slot = ant_shape_lookup_symbol(child, sym_off);
if (slot >= 0) {
if (out_slot) *out_slot = (uint32_t)slot;
ant_shape_retain(child); ant_shape_release(shape);
*shape_pp = child; return true;
}
}
ant_shape_t *shared = ant_shape_clone(shape);
if (!shared) return false;
if (!shape_add_key(shared, ANT_SHAPE_KEY_SYMBOL, NULL, sym_off, attrs, out_slot)) {
ant_shape_release(shared);
return false;
}
shape_record_child(shape, ckey, shared);
ant_shape_release(shared);
ant_shape_t *next = ant_shape_clone(shared);
if (!next) return false;
ant_shape_release(shape);
*shape_pp = next;
return true;
}
ant_shape_t *ant_shape_new_with_inobj_limit(uint8_t inobj_limit) {
uint8_t clamped = shape_clamp_inobj_limit(inobj_limit);
if (!g_root_shapes[clamped]) {
ant_shape_t *s = calloc(1, sizeof(*s));
if (!s) return NULL;
g_shape_bytes += sizeof(*s);
s->inobj_limit = clamped;
s->ref_count = 1;
g_root_shapes[clamped] = s;
}
ant_shape_retain(g_root_shapes[clamped]);
return g_root_shapes[clamped];
}
ant_shape_t *ant_shape_new(void) {
return ant_shape_new_with_inobj_limit((uint8_t)ANT_INOBJ_MAX_SLOTS);
}
ant_shape_t *ant_shape_clone(const ant_shape_t *shape) {
if (!shape) return NULL;
ant_shape_t *copy = calloc(1, sizeof(*copy));
if (!copy) return NULL;
g_shape_bytes += sizeof(*copy);
copy->ref_count = 1;
copy->inobj_limit = shape_clamp_inobj_limit(shape->inobj_limit);
if (shape->count > 0) {
if (!shape_ensure_capacity(copy, shape->count)) {
ant_shape_release(copy);
return NULL;
}
memcpy(copy->props, shape->props, sizeof(*shape->props) * shape->count);
copy->count = shape->count;
if (!shape_rebuild_index(copy)) {
ant_shape_release(copy);
return NULL;
}}
return copy;
}
bool ant_shape_is_shared(const ant_shape_t *shape) {
return shape && shape->ref_count > 1;
}
void ant_shape_retain(ant_shape_t *shape) {
if (!shape) return;
shape->ref_count++;
}
void ant_shape_release(ant_shape_t *shape) {
if (!shape) return;
if (shape->ref_count == 0 || --shape->ref_count != 0) return;
if (shape->parent) {
shape_child_entry_t *entry = NULL;
HASH_FIND(hh, shape->parent->children, &shape->parent_key, sizeof(shape->parent_key), entry);
if (entry) {
HASH_DEL(shape->parent->children, entry);
shape_entry_free(entry);
}
shape->parent = NULL;
}
shape_child_entry_t *ce, *ctmp;
HASH_ITER(hh, shape->children, ce, ctmp) {
if (ce->child) {
ce->child->parent = NULL;
ant_shape_release(ce->child);
}
HASH_DEL(shape->children, ce);
shape_entry_free(ce);
}
shape_index_entry_t *entry, *tmp;
HASH_ITER(hh, shape->index, entry, tmp) {
HASH_DEL(shape->index, entry);
g_shape_bytes -= sizeof(*entry);
shape_entry_free(entry);
}
g_shape_bytes -= shape->cap * sizeof(*shape->props);
g_shape_bytes -= sizeof(*shape);
free(shape->props);
free(shape);
}
size_t ant_shape_total_bytes(void) { return g_shape_bytes; }
static uint16_t gc_shape_epoch = 0;
void ant_gc_shapes_begin(void) {
gc_shape_epoch++;
if (gc_shape_epoch == 0) gc_shape_epoch = 1;
}
void ant_gc_shapes_mark(ant_shape_t *shape) {
for (; shape; shape = shape->parent) {
if (shape->gc_mark == gc_shape_epoch) break;
shape->gc_mark = gc_shape_epoch;
}}
static bool shape_prune_dead_children(ant_shape_t *shape) {
bool freed_any = false;
shape_child_entry_t *ce, *ctmp;
HASH_ITER(hh, shape->children, ce, ctmp) {
if (shape_prune_dead_children(ce->child)) freed_any = true;
if (ce->child->gc_mark != gc_shape_epoch && !ce->child->children) {
ant_shape_t *child = ce->child;
child->parent = NULL;
HASH_DEL(shape->children, ce);
shape_entry_free(ce);
ant_shape_release(child);
freed_any = true;
}}
return freed_any;
}
bool ant_gc_shapes_sweep(void) {
bool freed_any = false;
for (int i = 0; i <= (int)ANT_INOBJ_MAX_SLOTS; i++) {
if (g_root_shapes[i] && shape_prune_dead_children(g_root_shapes[i])) freed_any = true;
}
shape_entry_pool_trim();
return freed_any;
}
uint8_t ant_shape_get_inobj_limit(const ant_shape_t *shape) {
if (!shape) return (uint8_t)ANT_INOBJ_MAX_SLOTS;
return shape_clamp_inobj_limit(shape->inobj_limit);
}
int32_t ant_shape_lookup_interned(const ant_shape_t *shape, const char *interned) {
shape_index_entry_t *entry = shape_lookup(shape, shape_key_interned(interned));
return entry ? (int32_t)entry->slot : -1;
}
int32_t ant_shape_lookup_symbol(const ant_shape_t *shape, ant_offset_t sym_off) {
shape_index_entry_t *entry = shape_lookup(shape, shape_key_symbol(sym_off));
return entry ? (int32_t)entry->slot : -1;
}
bool ant_shape_add_interned(ant_shape_t *shape, const char *interned, uint8_t attrs, uint32_t *out_slot) {
return shape_add_key(shape, ANT_SHAPE_KEY_STRING, interned, 0, attrs, out_slot);
}
bool ant_shape_add_symbol(ant_shape_t *shape, ant_offset_t sym_off, uint8_t attrs, uint32_t *out_slot) {
return shape_add_key(shape, ANT_SHAPE_KEY_SYMBOL, NULL, sym_off, attrs, out_slot);
}
bool ant_shape_remove_slot(ant_shape_t *shape, uint32_t slot, uint32_t *swapped_from) {
if (!shape || slot >= shape->count) return false;
if (swapped_from) *swapped_from = slot;
const ant_shape_prop_t *dp = &shape->props[slot];
uint64_t del_key = (dp->type == ANT_SHAPE_KEY_SYMBOL)
? shape_key_symbol(dp->key.sym_off)
: shape_key_interned(dp->key.interned);
shape_index_entry_t *del_entry = NULL;
HASH_FIND(hh, shape->index, &del_key, sizeof(del_key), del_entry);
if (del_entry) {
HASH_DEL(shape->index, del_entry);
shape_entry_free(del_entry);
}
uint32_t last = shape->count - 1;
if (slot != last) {
shape->props[slot] = shape->props[last];
const ant_shape_prop_t *sp = &shape->props[slot];
uint64_t swap_key = (sp->type == ANT_SHAPE_KEY_SYMBOL)
? shape_key_symbol(sp->key.sym_off)
: shape_key_interned(sp->key.interned);
shape_index_entry_t *swap_entry = NULL;
HASH_FIND(hh, shape->index, &swap_key, sizeof(swap_key), swap_entry);
if (swap_entry) swap_entry->slot = slot;
if (swapped_from) *swapped_from = last;
}
shape->count--;
ant_ic_epoch_bump();
return true;
}
uint32_t ant_shape_count(const ant_shape_t *shape) {
return shape ? shape->count : 0;
}
const ant_shape_prop_t *ant_shape_prop_at(const ant_shape_t *shape, uint32_t slot) {
if (!shape || slot >= shape->count) return NULL;
return &shape->props[slot];
}
ant_shape_prop_t *ant_shape_prop_mut_at(ant_shape_t *shape, uint32_t slot) {
if (!shape || slot >= shape->count) return NULL;
return &shape->props[slot];
}
bool ant_shape_set_attrs_interned(ant_shape_t *shape, const char *interned, uint8_t attrs) {
int32_t slot = ant_shape_lookup_interned(shape, interned);
if (slot < 0) return false;
shape->props[(uint32_t)slot].attrs = attrs;
ant_ic_epoch_bump();
return true;
}
bool ant_shape_set_attrs_symbol(ant_shape_t *shape, ant_offset_t sym_off, uint8_t attrs) {
int32_t slot = ant_shape_lookup_symbol(shape, sym_off);
if (slot < 0) return false;
shape->props[(uint32_t)slot].attrs = attrs;
ant_ic_epoch_bump();
return true;
}
uint8_t ant_shape_get_attrs(const ant_shape_t *shape, uint32_t slot) {
const ant_shape_prop_t *prop = ant_shape_prop_at(shape, slot);
return prop ? prop->attrs : ANT_PROP_ATTR_DEFAULT;
}
bool ant_shape_clear_accessor_slot(ant_shape_t *shape, uint32_t slot) {
ant_shape_prop_t *prop = ant_shape_prop_mut_at(shape, slot);
if (!prop) return false;
prop->has_getter = 0;
prop->has_setter = 0;
prop->getter = 0;
prop->setter = 0;
ant_ic_epoch_bump();
return true;
}

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