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objects now work as private non enumerable keys

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This commit is contained in:
John Alanbrook
2026-01-02 16:28:02 -06:00
parent d6468e7fd2
commit d12d77c22c
2 changed files with 229 additions and 3 deletions
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119
source/quickjs.c
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@@ -500,6 +500,16 @@ struct JSString {
} u;
};
/* Extended symbol atom structure with object-key payload */
typedef struct JSAtomSymbol {
JSString s; /* base atom struct */
JSValue obj_key; /* JS_UNDEFINED for normal symbols; strong ref for object-key symbols */
} JSAtomSymbol;
static inline JSAtomSymbol *js_atom_as_symbol(JSAtomStruct *p) {
return (JSAtomSymbol *)p;
}
typedef struct JSStringRope {
JSRefCountHeader header; /* must come first, 32-bit */
uint32_t len;
@@ -815,6 +825,7 @@ struct JSObject {
};
JSShape *shape; /* prototype and property names + flag */
JSProperty *prop; /* array of properties */
JSAtom object_key_atom; /* cached atom index for object-as-key (non-owning hint) */
union {
void *opaque;
struct JSBoundFunction *bound_function; /* JS_CLASS_BOUND_FUNCTION */
@@ -2508,12 +2519,16 @@ static JSAtom __JS_NewAtom(JSRuntime *rt, JSString *str, int atom_type)
js_free_string(rt, str);
}
} else {
p = js_malloc_rt(rt, sizeof(JSAtomStruct)); /* empty wide string */
if (!p)
/* Allocate extended JSAtomSymbol for symbol atoms */
JSAtomSymbol *sp;
sp = js_malloc_rt(rt, sizeof(JSAtomSymbol));
if (!sp)
return JS_ATOM_NULL;
p = &sp->s;
p->header.ref_count = 1;
p->is_wide_char = 1; /* Hack to represent NULL as a JSString */
p->len = 0;
sp->obj_key = JS_NULL;
#ifdef DUMP_LEAKS
list_add_tail(&p->link, &rt->string_list);
#endif
@@ -2624,6 +2639,14 @@ static void JS_FreeAtomStruct(JSRuntime *rt, JSAtomStruct *p)
/* live weak references are still present on this object: keep
it */
} else {
/* Free object-key payload for symbol atoms before freeing struct */
if (p->atom_type == JS_ATOM_TYPE_SYMBOL) {
JSAtomSymbol *sp = js_atom_as_symbol(p);
if (!JS_IsNull(sp->obj_key)) {
JS_FreeValueRT(rt, sp->obj_key);
sp->obj_key = JS_NULL;
}
}
js_free_rt(rt, p);
}
rt->atom_count--;
@@ -2640,6 +2663,70 @@ static void __JS_FreeAtom(JSRuntime *rt, uint32_t i)
JS_FreeAtomStruct(rt, p);
}
/* Get or create a unique symbol atom for using an object as a property key.
Returns JS_ATOM_NULL on allocation failure. */
static JSAtom js_get_object_key_atom(JSContext *ctx, JSObject *key_obj)
{
JSRuntime *rt = ctx->rt;
JSAtom atom = key_obj->object_key_atom;
/* Validate cached atom (non-owning; may be stale) */
if (atom != JS_ATOM_NULL &&
atom < (JSAtom)rt->atom_size &&
rt->atom_array[atom] != NULL &&
!atom_is_free(rt->atom_array[atom])) {
JSAtomStruct *ap = rt->atom_array[atom];
if (ap->atom_type == JS_ATOM_TYPE_SYMBOL) {
JSAtomSymbol *sp = js_atom_as_symbol(ap);
if (JS_VALUE_GET_TAG(sp->obj_key) == JS_TAG_OBJECT &&
JS_VALUE_GET_OBJ(sp->obj_key) == key_obj) {
return atom;
}
}
}
/* Create a fresh symbol atom (passing NULL for symbol str) */
atom = __JS_NewAtom(rt, NULL, JS_ATOM_TYPE_SYMBOL);
if (atom == JS_ATOM_NULL)
return JS_ATOM_NULL;
{
JSAtomStruct *ap = rt->atom_array[atom];
JSAtomSymbol *sp = js_atom_as_symbol(ap);
sp->obj_key = JS_DupValue(ctx, JS_MKPTR(JS_TAG_OBJECT, key_obj));
}
key_obj->object_key_atom = atom;
return atom;
}
/* Get or create a symbol value for using an object as a property key.
Returns JS_EXCEPTION on allocation failure. */
static JSValue js_get_object_key_symbol(JSContext *ctx, JSObject *key_obj)
{
JSAtom atom = js_get_object_key_atom(ctx, key_obj);
if (atom == JS_ATOM_NULL)
return JS_ThrowOutOfMemory(ctx);
return JS_MKPTR(JS_TAG_SYMBOL, ctx->rt->atom_array[atom]);
}
/* Check if a symbol atom is an object-key symbol (has obj_key payload) */
static BOOL js_atom_is_object_key_symbol(JSRuntime *rt, JSAtom atom)
{
if (__JS_AtomIsTaggedInt(atom))
return FALSE;
if (atom >= (JSAtom)rt->atom_size)
return FALSE;
JSAtomStruct *ap = rt->atom_array[atom];
if (!ap || ap->atom_type != JS_ATOM_TYPE_SYMBOL)
return FALSE;
JSAtomSymbol *sp = js_atom_as_symbol(ap);
return !JS_IsNull(sp->obj_key);
}
/* Warning: 'p' is freed */
static JSAtom JS_NewAtomStr(JSContext *ctx, JSString *p)
{
@@ -4736,6 +4823,7 @@ static JSValue JS_NewObjectFromShape(JSContext *ctx, JSShape *sh, JSClassID clas
p->is_constructor = 0;
p->has_immutable_prototype = 0;
p->tmp_mark = 0;
p->object_key_atom = JS_ATOM_NULL;
p->u.opaque = NULL;
p->shape = sh;
p->prop = js_malloc(ctx, sizeof(JSProperty) * sh->prop_size);
@@ -5496,6 +5584,16 @@ static void mark_children(JSRuntime *rt, JSGCObjectHeader *gp,
for(i = 0; i < sh->prop_count; i++) {
JSProperty *pr = &p->prop[i];
if (prs->atom != JS_ATOM_NULL) {
/* Mark object-key symbol payload to keep key object alive */
if (!__JS_AtomIsTaggedInt(prs->atom)) {
JSAtomStruct *ap = rt->atom_array[prs->atom];
if (ap && ap->atom_type == JS_ATOM_TYPE_SYMBOL) {
JSAtomSymbol *sp = js_atom_as_symbol(ap);
if (!JS_IsNull(sp->obj_key)) {
JS_MarkValue(rt, sp->obj_key, mark_func);
}
}
}
if (prs->flags & JS_PROP_TMASK) {
if ((prs->flags & JS_PROP_TMASK) == JS_PROP_GETSET) {
if (pr->u.getset.getter)
@@ -7127,6 +7225,9 @@ static int __exception JS_GetOwnPropertyNamesInternal(JSContext *ctx,
for(i = 0, prs = get_shape_prop(sh); i < sh->prop_count; i++, prs++) {
atom = prs->atom;
if (atom != JS_ATOM_NULL) {
/* Skip object-key symbols (private access tokens, not enumerable) */
if (js_atom_is_object_key_symbol(ctx->rt, atom))
continue;
is_enumerable = ((prs->flags & JS_PROP_ENUMERABLE) != 0);
kind = JS_AtomGetKind(ctx, atom);
if ((!(flags & JS_GPN_ENUM_ONLY) || is_enumerable) &&
@@ -7197,6 +7298,9 @@ static int __exception JS_GetOwnPropertyNamesInternal(JSContext *ctx,
for(i = 0, prs = get_shape_prop(sh); i < sh->prop_count; i++, prs++) {
atom = prs->atom;
if (atom != JS_ATOM_NULL) {
/* Skip object-key symbols (private access tokens, not enumerable) */
if (js_atom_is_object_key_symbol(ctx->rt, atom))
continue;
is_enumerable = ((prs->flags & JS_PROP_ENUMERABLE) != 0);
kind = JS_AtomGetKind(ctx, atom);
if ((!(flags & JS_GPN_ENUM_ONLY) || is_enumerable) &&
@@ -7442,7 +7546,8 @@ JSAtom JS_ValueToAtom(JSContext *ctx, JSValueConst val)
if (JS_IsException(str))
return JS_ATOM_NULL;
if (JS_VALUE_GET_TAG(str) == JS_TAG_SYMBOL) {
atom = js_symbol_to_atom(ctx, str);
/* Must dup atom for proper ownership (especially for object-key symbols) */
atom = JS_DupAtom(ctx, js_symbol_to_atom(ctx, str));
} else {
atom = JS_NewAtomStr(ctx, JS_VALUE_GET_STRING(str));
}
@@ -10170,6 +10275,14 @@ static JSValue JS_ToLocaleStringFree(JSContext *ctx, JSValue val)
JSValue JS_ToPropertyKey(JSContext *ctx, JSValueConst val)
{
int tag = JS_VALUE_GET_TAG(val);
/* Objects become their cached object-key symbol (identity-based key) */
if (tag == JS_TAG_OBJECT) {
return js_get_object_key_symbol(ctx, JS_VALUE_GET_OBJ(val));
}
/* Preserve existing behavior for everything else */
return JS_ToStringInternal(ctx, val, TRUE);
}