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cosmopolitan/third_party/duktape/duk_api_object.c

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/*
* Object handling: property access and other support functions.
*/
#include "third_party/duktape/duk_internal.h"
/*
* Property handling
*
* The API exposes only the most common property handling functions.
* The caller can invoke ECMAScript built-ins for full control (e.g.
* defineProperty, getOwnPropertyDescriptor).
*/
DUK_EXTERNAL duk_bool_t duk_get_prop(duk_hthread *thr, duk_idx_t obj_idx) {
duk_tval *tv_obj;
duk_tval *tv_key;
duk_bool_t rc;
DUK_ASSERT_API_ENTRY(thr);
/* Note: copying tv_obj and tv_key to locals to shield against a valstack
* resize is not necessary for a property get right now.
*/
tv_obj = duk_require_tval(thr, obj_idx);
tv_key = duk_require_tval(thr, -1);
rc = duk_hobject_getprop(thr, tv_obj, tv_key);
DUK_ASSERT(rc == 0 || rc == 1);
/* a value is left on stack regardless of rc */
duk_remove_m2(thr); /* remove key */
DUK_ASSERT(duk_is_undefined(thr, -1) || rc == 1);
return rc; /* 1 if property found, 0 otherwise */
}
DUK_EXTERNAL duk_bool_t duk_get_prop_string(duk_hthread *thr, duk_idx_t obj_idx, const char *key) {
DUK_ASSERT_API_ENTRY(thr);
DUK_ASSERT(key != NULL);
obj_idx = duk_require_normalize_index(thr, obj_idx);
(void) duk_push_string(thr, key);
return duk_get_prop(thr, obj_idx);
}
DUK_EXTERNAL duk_bool_t duk_get_prop_lstring(duk_hthread *thr, duk_idx_t obj_idx, const char *key, duk_size_t key_len) {
DUK_ASSERT_API_ENTRY(thr);
DUK_ASSERT(key != NULL);
obj_idx = duk_require_normalize_index(thr, obj_idx);
(void) duk_push_lstring(thr, key, key_len);
return duk_get_prop(thr, obj_idx);
}
#if !defined(DUK_USE_PREFER_SIZE)
DUK_EXTERNAL duk_bool_t duk_get_prop_literal_raw(duk_hthread *thr, duk_idx_t obj_idx, const char *key, duk_size_t key_len) {
DUK_ASSERT_API_ENTRY(thr);
DUK_ASSERT(key != NULL);
DUK_ASSERT(key[key_len] == (char) 0);
obj_idx = duk_require_normalize_index(thr, obj_idx);
(void) duk_push_literal_raw(thr, key, key_len);
return duk_get_prop(thr, obj_idx);
}
#endif
DUK_EXTERNAL duk_bool_t duk_get_prop_index(duk_hthread *thr, duk_idx_t obj_idx, duk_uarridx_t arr_idx) {
DUK_ASSERT_API_ENTRY(thr);
obj_idx = duk_require_normalize_index(thr, obj_idx);
duk_push_uarridx(thr, arr_idx);
return duk_get_prop(thr, obj_idx);
}
DUK_EXTERNAL duk_bool_t duk_get_prop_heapptr(duk_hthread *thr, duk_idx_t obj_idx, void *ptr) {
DUK_ASSERT_API_ENTRY(thr);
obj_idx = duk_require_normalize_index(thr, obj_idx);
(void) duk_push_heapptr(thr, ptr); /* NULL -> 'undefined' */
return duk_get_prop(thr, obj_idx);
}
DUK_INTERNAL duk_bool_t duk_get_prop_stridx(duk_hthread *thr, duk_idx_t obj_idx, duk_small_uint_t stridx) {
DUK_ASSERT_API_ENTRY(thr);
DUK_ASSERT_STRIDX_VALID(stridx);
obj_idx = duk_require_normalize_index(thr, obj_idx);
(void) duk_push_hstring(thr, DUK_HTHREAD_GET_STRING(thr, stridx));
return duk_get_prop(thr, obj_idx);
}
DUK_INTERNAL duk_bool_t duk_get_prop_stridx_short_raw(duk_hthread *thr, duk_uint_t packed_args) {
return duk_get_prop_stridx(thr, (duk_idx_t) (duk_int16_t) (packed_args >> 16),
(duk_small_uint_t) (packed_args & 0xffffUL));
}
DUK_INTERNAL duk_bool_t duk_get_prop_stridx_boolean(duk_hthread *thr, duk_idx_t obj_idx, duk_small_uint_t stridx, duk_bool_t *out_has_prop) {
duk_bool_t rc;
DUK_ASSERT_API_ENTRY(thr);
DUK_ASSERT_STRIDX_VALID(stridx);
rc = duk_get_prop_stridx(thr, obj_idx, stridx);
if (out_has_prop) {
*out_has_prop = rc;
}
return duk_to_boolean_top_pop(thr);
}
/* This get variant is for internal use, it differs from standard
* duk_get_prop() in that:
* - Object argument must be an object (primitive values not supported).
* - Key argument must be a string (no coercion).
* - Only own properties are checked (no inheritance). Only "entry part"
* properties are checked (not array index properties).
* - Property must be a plain data property, not a getter.
* - Proxy traps are not triggered.
*/
DUK_INTERNAL duk_bool_t duk_xget_owndataprop(duk_hthread *thr, duk_idx_t obj_idx) {
duk_hobject *h_obj;
duk_hstring *h_key;
duk_tval *tv_val;
DUK_ASSERT_API_ENTRY(thr);
/* Note: copying tv_obj and tv_key to locals to shield against a valstack
* resize is not necessary for a property get right now.
*/
h_obj = duk_get_hobject(thr, obj_idx);
if (h_obj == NULL) {
return 0;
}
h_key = duk_require_hstring(thr, -1);
tv_val = duk_hobject_find_entry_tval_ptr(thr->heap, h_obj, h_key);
if (tv_val == NULL) {
return 0;
}
duk_push_tval(thr, tv_val);
duk_remove_m2(thr); /* remove key */
return 1;
}
DUK_INTERNAL duk_bool_t duk_xget_owndataprop_stridx(duk_hthread *thr, duk_idx_t obj_idx, duk_small_uint_t stridx) {
DUK_ASSERT_API_ENTRY(thr);
DUK_ASSERT_STRIDX_VALID(stridx);
obj_idx = duk_require_normalize_index(thr, obj_idx);
(void) duk_push_hstring(thr, DUK_HTHREAD_GET_STRING(thr, stridx));
return duk_xget_owndataprop(thr, obj_idx);
}
DUK_INTERNAL duk_bool_t duk_xget_owndataprop_stridx_short_raw(duk_hthread *thr, duk_uint_t packed_args) {
return duk_xget_owndataprop_stridx(thr, (duk_idx_t) (duk_int16_t) (packed_args >> 16),
(duk_small_uint_t) (packed_args & 0xffffUL));
}
DUK_LOCAL duk_bool_t duk__put_prop_shared(duk_hthread *thr, duk_idx_t obj_idx, duk_idx_t idx_key) {
duk_tval *tv_obj;
duk_tval *tv_key;
duk_tval *tv_val;
duk_bool_t throw_flag;
duk_bool_t rc;
/* Note: copying tv_obj and tv_key to locals to shield against a valstack
* resize is not necessary for a property put right now (putprop protects
* against it internally).
*/
/* Key and value indices are either (-2, -1) or (-1, -2). Given idx_key,
* idx_val is always (idx_key ^ 0x01).
*/
DUK_ASSERT((idx_key == -2 && (idx_key ^ 1) == -1) ||
(idx_key == -1 && (idx_key ^ 1) == -2));
/* XXX: Direct access; faster validation. */
tv_obj = duk_require_tval(thr, obj_idx);
tv_key = duk_require_tval(thr, idx_key);
tv_val = duk_require_tval(thr, idx_key ^ 1);
throw_flag = duk_is_strict_call(thr);
rc = duk_hobject_putprop(thr, tv_obj, tv_key, tv_val, throw_flag);
DUK_ASSERT(rc == 0 || rc == 1);
duk_pop_2(thr); /* remove key and value */
return rc; /* 1 if property found, 0 otherwise */
}
DUK_EXTERNAL duk_bool_t duk_put_prop(duk_hthread *thr, duk_idx_t obj_idx) {
DUK_ASSERT_API_ENTRY(thr);
return duk__put_prop_shared(thr, obj_idx, -2);
}
DUK_EXTERNAL duk_bool_t duk_put_prop_string(duk_hthread *thr, duk_idx_t obj_idx, const char *key) {
DUK_ASSERT_API_ENTRY(thr);
DUK_ASSERT(key != NULL);
/* Careful here and with other duk_put_prop_xxx() helpers: the
* target object and the property value may be in the same value
* stack slot (unusual, but still conceptually clear).
*/
obj_idx = duk_normalize_index(thr, obj_idx);
(void) duk_push_string(thr, key);
return duk__put_prop_shared(thr, obj_idx, -1);
}
DUK_EXTERNAL duk_bool_t duk_put_prop_lstring(duk_hthread *thr, duk_idx_t obj_idx, const char *key, duk_size_t key_len) {
DUK_ASSERT_API_ENTRY(thr);
DUK_ASSERT(key != NULL);
obj_idx = duk_normalize_index(thr, obj_idx);
(void) duk_push_lstring(thr, key, key_len);
return duk__put_prop_shared(thr, obj_idx, -1);
}
#if !defined(DUK_USE_PREFER_SIZE)
DUK_EXTERNAL duk_bool_t duk_put_prop_literal_raw(duk_hthread *thr, duk_idx_t obj_idx, const char *key, duk_size_t key_len) {
DUK_ASSERT_API_ENTRY(thr);
DUK_ASSERT(key != NULL);
DUK_ASSERT(key[key_len] == (char) 0);
obj_idx = duk_normalize_index(thr, obj_idx);
(void) duk_push_literal_raw(thr, key, key_len);
return duk__put_prop_shared(thr, obj_idx, -1);
}
#endif
DUK_EXTERNAL duk_bool_t duk_put_prop_index(duk_hthread *thr, duk_idx_t obj_idx, duk_uarridx_t arr_idx) {
DUK_ASSERT_API_ENTRY(thr);
obj_idx = duk_require_normalize_index(thr, obj_idx);
duk_push_uarridx(thr, arr_idx);
return duk__put_prop_shared(thr, obj_idx, -1);
}
DUK_EXTERNAL duk_bool_t duk_put_prop_heapptr(duk_hthread *thr, duk_idx_t obj_idx, void *ptr) {
DUK_ASSERT_API_ENTRY(thr);
obj_idx = duk_require_normalize_index(thr, obj_idx);
(void) duk_push_heapptr(thr, ptr); /* NULL -> 'undefined' */
return duk__put_prop_shared(thr, obj_idx, -1);
}
DUK_INTERNAL duk_bool_t duk_put_prop_stridx(duk_hthread *thr, duk_idx_t obj_idx, duk_small_uint_t stridx) {
DUK_ASSERT_API_ENTRY(thr);
DUK_ASSERT_STRIDX_VALID(stridx);
obj_idx = duk_require_normalize_index(thr, obj_idx);
duk_push_hstring(thr, DUK_HTHREAD_GET_STRING(thr, stridx));
return duk__put_prop_shared(thr, obj_idx, -1);
}
DUK_INTERNAL duk_bool_t duk_put_prop_stridx_short_raw(duk_hthread *thr, duk_uint_t packed_args) {
return duk_put_prop_stridx(thr, (duk_idx_t) (duk_int16_t) (packed_args >> 16),
(duk_small_uint_t) (packed_args & 0xffffUL));
}
DUK_EXTERNAL duk_bool_t duk_del_prop(duk_hthread *thr, duk_idx_t obj_idx) {
duk_tval *tv_obj;
duk_tval *tv_key;
duk_bool_t throw_flag;
duk_bool_t rc;
DUK_ASSERT_API_ENTRY(thr);
/* Note: copying tv_obj and tv_key to locals to shield against a valstack
* resize is not necessary for a property delete right now.
*/
tv_obj = duk_require_tval(thr, obj_idx);
tv_key = duk_require_tval(thr, -1);
throw_flag = duk_is_strict_call(thr);
rc = duk_hobject_delprop(thr, tv_obj, tv_key, throw_flag);
DUK_ASSERT(rc == 0 || rc == 1);
duk_pop(thr); /* remove key */
return rc;
}
DUK_EXTERNAL duk_bool_t duk_del_prop_string(duk_hthread *thr, duk_idx_t obj_idx, const char *key) {
DUK_ASSERT_API_ENTRY(thr);
DUK_ASSERT(key != NULL);
obj_idx = duk_require_normalize_index(thr, obj_idx);
(void) duk_push_string(thr, key);
return duk_del_prop(thr, obj_idx);
}
DUK_EXTERNAL duk_bool_t duk_del_prop_lstring(duk_hthread *thr, duk_idx_t obj_idx, const char *key, duk_size_t key_len) {
DUK_ASSERT_API_ENTRY(thr);
DUK_ASSERT(key != NULL);
obj_idx = duk_require_normalize_index(thr, obj_idx);
(void) duk_push_lstring(thr, key, key_len);
return duk_del_prop(thr, obj_idx);
}
#if !defined(DUK_USE_PREFER_SIZE)
DUK_EXTERNAL duk_bool_t duk_del_prop_literal_raw(duk_hthread *thr, duk_idx_t obj_idx, const char *key, duk_size_t key_len) {
DUK_ASSERT_API_ENTRY(thr);
DUK_ASSERT(key != NULL);
DUK_ASSERT(key[key_len] == (char) 0);
obj_idx = duk_require_normalize_index(thr, obj_idx);
(void) duk_push_literal_raw(thr, key, key_len);
return duk_del_prop(thr, obj_idx);
}
#endif
DUK_EXTERNAL duk_bool_t duk_del_prop_index(duk_hthread *thr, duk_idx_t obj_idx, duk_uarridx_t arr_idx) {
DUK_ASSERT_API_ENTRY(thr);
obj_idx = duk_require_normalize_index(thr, obj_idx);
duk_push_uarridx(thr, arr_idx);
return duk_del_prop(thr, obj_idx);
}
DUK_EXTERNAL duk_bool_t duk_del_prop_heapptr(duk_hthread *thr, duk_idx_t obj_idx, void *ptr) {
DUK_ASSERT_API_ENTRY(thr);
obj_idx = duk_require_normalize_index(thr, obj_idx);
(void) duk_push_heapptr(thr, ptr); /* NULL -> 'undefined' */
return duk_del_prop(thr, obj_idx);
}
DUK_INTERNAL duk_bool_t duk_del_prop_stridx(duk_hthread *thr, duk_idx_t obj_idx, duk_small_uint_t stridx) {
DUK_ASSERT_API_ENTRY(thr);
DUK_ASSERT_STRIDX_VALID(stridx);
obj_idx = duk_require_normalize_index(thr, obj_idx);
duk_push_hstring(thr, DUK_HTHREAD_GET_STRING(thr, stridx));
return duk_del_prop(thr, obj_idx);
}
#if 0
DUK_INTERNAL duk_bool_t duk_del_prop_stridx_short_raw(duk_hthread *thr, duk_uint_t packed_args) {
return duk_del_prop_stridx(thr, (duk_idx_t) (duk_int16_t) (packed_args >> 16),
(duk_small_uint_t) (packed_args & 0xffffUL));
}
#endif
DUK_EXTERNAL duk_bool_t duk_has_prop(duk_hthread *thr, duk_idx_t obj_idx) {
duk_tval *tv_obj;
duk_tval *tv_key;
duk_bool_t rc;
DUK_ASSERT_API_ENTRY(thr);
/* Note: copying tv_obj and tv_key to locals to shield against a valstack
* resize is not necessary for a property existence check right now.
*/
tv_obj = duk_require_tval(thr, obj_idx);
tv_key = duk_require_tval(thr, -1);
rc = duk_hobject_hasprop(thr, tv_obj, tv_key);
DUK_ASSERT(rc == 0 || rc == 1);
duk_pop(thr); /* remove key */
return rc; /* 1 if property found, 0 otherwise */
}
DUK_EXTERNAL duk_bool_t duk_has_prop_string(duk_hthread *thr, duk_idx_t obj_idx, const char *key) {
DUK_ASSERT_API_ENTRY(thr);
DUK_ASSERT(key != NULL);
obj_idx = duk_require_normalize_index(thr, obj_idx);
(void) duk_push_string(thr, key);
return duk_has_prop(thr, obj_idx);
}
DUK_EXTERNAL duk_bool_t duk_has_prop_lstring(duk_hthread *thr, duk_idx_t obj_idx, const char *key, duk_size_t key_len) {
DUK_ASSERT_API_ENTRY(thr);
DUK_ASSERT(key != NULL);
obj_idx = duk_require_normalize_index(thr, obj_idx);
(void) duk_push_lstring(thr, key, key_len);
return duk_has_prop(thr, obj_idx);
}
#if !defined(DUK_USE_PREFER_SIZE)
DUK_EXTERNAL duk_bool_t duk_has_prop_literal_raw(duk_hthread *thr, duk_idx_t obj_idx, const char *key, duk_size_t key_len) {
DUK_ASSERT_API_ENTRY(thr);
DUK_ASSERT(key != NULL);
DUK_ASSERT(key[key_len] == (char) 0);
obj_idx = duk_require_normalize_index(thr, obj_idx);
(void) duk_push_literal_raw(thr, key, key_len);
return duk_has_prop(thr, obj_idx);
}
#endif
DUK_EXTERNAL duk_bool_t duk_has_prop_index(duk_hthread *thr, duk_idx_t obj_idx, duk_uarridx_t arr_idx) {
DUK_ASSERT_API_ENTRY(thr);
obj_idx = duk_require_normalize_index(thr, obj_idx);
duk_push_uarridx(thr, arr_idx);
return duk_has_prop(thr, obj_idx);
}
DUK_EXTERNAL duk_bool_t duk_has_prop_heapptr(duk_hthread *thr, duk_idx_t obj_idx, void *ptr) {
DUK_ASSERT_API_ENTRY(thr);
obj_idx = duk_require_normalize_index(thr, obj_idx);
(void) duk_push_heapptr(thr, ptr); /* NULL -> 'undefined' */
return duk_has_prop(thr, obj_idx);
}
DUK_INTERNAL duk_bool_t duk_has_prop_stridx(duk_hthread *thr, duk_idx_t obj_idx, duk_small_uint_t stridx) {
DUK_ASSERT_API_ENTRY(thr);
DUK_ASSERT_STRIDX_VALID(stridx);
obj_idx = duk_require_normalize_index(thr, obj_idx);
duk_push_hstring(thr, DUK_HTHREAD_GET_STRING(thr, stridx));
return duk_has_prop(thr, obj_idx);
}
#if 0
DUK_INTERNAL duk_bool_t duk_has_prop_stridx_short_raw(duk_hthread *thr, duk_uint_t packed_args) {
return duk_has_prop_stridx(thr, (duk_idx_t) (duk_int16_t) (packed_args >> 16),
(duk_small_uint_t) (packed_args & 0xffffUL));
}
#endif
/* Define own property without inheritance lookups and such. This differs from
* [[DefineOwnProperty]] because special behaviors (like Array 'length') are
* not invoked by this method. The caller must be careful to invoke any such
* behaviors if necessary.
*/
DUK_INTERNAL void duk_xdef_prop(duk_hthread *thr, duk_idx_t obj_idx, duk_small_uint_t desc_flags) {
duk_hobject *obj;
duk_hstring *key;
DUK_ASSERT_API_ENTRY(thr);
obj = duk_require_hobject(thr, obj_idx);
DUK_ASSERT(obj != NULL);
key = duk_to_property_key_hstring(thr, -2);
DUK_ASSERT(key != NULL);
DUK_ASSERT(duk_require_tval(thr, -1) != NULL);
duk_hobject_define_property_internal(thr, obj, key, desc_flags);
duk_pop(thr); /* pop key */
}
DUK_INTERNAL void duk_xdef_prop_index(duk_hthread *thr, duk_idx_t obj_idx, duk_uarridx_t arr_idx, duk_small_uint_t desc_flags) {
duk_hobject *obj;
DUK_ASSERT_API_ENTRY(thr);
obj = duk_require_hobject(thr, obj_idx);
DUK_ASSERT(obj != NULL);
duk_hobject_define_property_internal_arridx(thr, obj, arr_idx, desc_flags);
/* value popped by call */
}
DUK_INTERNAL void duk_xdef_prop_stridx(duk_hthread *thr, duk_idx_t obj_idx, duk_small_uint_t stridx, duk_small_uint_t desc_flags) {
duk_hobject *obj;
duk_hstring *key;
DUK_ASSERT_API_ENTRY(thr);
DUK_ASSERT_STRIDX_VALID(stridx);
obj = duk_require_hobject(thr, obj_idx);
DUK_ASSERT(obj != NULL);
key = DUK_HTHREAD_GET_STRING(thr, stridx);
DUK_ASSERT(key != NULL);
DUK_ASSERT(duk_require_tval(thr, -1) != NULL);
duk_hobject_define_property_internal(thr, obj, key, desc_flags);
/* value popped by call */
}
DUK_INTERNAL void duk_xdef_prop_stridx_short_raw(duk_hthread *thr, duk_uint_t packed_args) {
duk_xdef_prop_stridx(thr, (duk_idx_t) (duk_int8_t) (packed_args >> 24),
(duk_small_uint_t) (packed_args >> 8) & 0xffffUL,
(duk_small_uint_t) (packed_args & 0xffL));
}
#if 0 /*unused*/
DUK_INTERNAL void duk_xdef_prop_stridx_builtin(duk_hthread *thr, duk_idx_t obj_idx, duk_small_uint_t stridx, duk_small_int_t builtin_idx, duk_small_uint_t desc_flags) {
duk_hobject *obj;
duk_hstring *key;
DUK_ASSERT_API_ENTRY(thr);
DUK_ASSERT_STRIDX_VALID(stridx);
DUK_ASSERT_BIDX_VALID(builtin_idx);
obj = duk_require_hobject(thr, obj_idx);
DUK_ASSERT(obj != NULL);
key = DUK_HTHREAD_GET_STRING(thr, stridx);
DUK_ASSERT(key != NULL);
duk_push_hobject(thr, thr->builtins[builtin_idx]);
duk_hobject_define_property_internal(thr, obj, key, desc_flags);
/* value popped by call */
}
#endif
/* This is a rare property helper; it sets the global thrower (E5 Section 13.2.3)
* setter/getter into an object property. This is needed by the 'arguments'
* object creation code, function instance creation code, and Function.prototype.bind().
*/
DUK_INTERNAL void duk_xdef_prop_stridx_thrower(duk_hthread *thr, duk_idx_t obj_idx, duk_small_uint_t stridx) {
DUK_ASSERT_API_ENTRY(thr);
obj_idx = duk_require_normalize_index(thr, obj_idx);
duk_push_hstring_stridx(thr, stridx);
duk_push_hobject_bidx(thr, DUK_BIDX_TYPE_ERROR_THROWER);
duk_dup_top(thr);
duk_def_prop(thr, obj_idx, DUK_DEFPROP_HAVE_SETTER | DUK_DEFPROP_HAVE_GETTER | DUK_DEFPROP_FORCE); /* attributes always 0 */
}
/* Object.getOwnPropertyDescriptor() equivalent C binding. */
DUK_EXTERNAL void duk_get_prop_desc(duk_hthread *thr, duk_idx_t obj_idx, duk_uint_t flags) {
DUK_ASSERT_API_ENTRY(thr);
DUK_UNREF(flags); /* no flags defined yet */
duk_hobject_object_get_own_property_descriptor(thr, obj_idx); /* [ ... key ] -> [ ... desc ] */
}
/* Object.defineProperty() equivalent C binding. */
DUK_EXTERNAL void duk_def_prop(duk_hthread *thr, duk_idx_t obj_idx, duk_uint_t flags) {
duk_idx_t idx_base;
duk_hobject *obj;
duk_hstring *key;
duk_idx_t idx_value;
duk_hobject *get;
duk_hobject *set;
duk_uint_t is_data_desc;
duk_uint_t is_acc_desc;
DUK_ASSERT_API_ENTRY(thr);
obj = duk_require_hobject(thr, obj_idx);
is_data_desc = flags & (DUK_DEFPROP_HAVE_VALUE | DUK_DEFPROP_HAVE_WRITABLE);
is_acc_desc = flags & (DUK_DEFPROP_HAVE_GETTER | DUK_DEFPROP_HAVE_SETTER);
if (is_data_desc && is_acc_desc) {
/* "Have" flags must not be conflicting so that they would
* apply to both a plain property and an accessor at the same
* time.
*/
goto fail_invalid_desc;
}
idx_base = duk_get_top_index(thr);
if (flags & DUK_DEFPROP_HAVE_SETTER) {
duk_require_type_mask(thr, idx_base, DUK_TYPE_MASK_UNDEFINED |
DUK_TYPE_MASK_OBJECT |
DUK_TYPE_MASK_LIGHTFUNC);
set = duk_get_hobject_promote_lfunc(thr, idx_base);
if (set != NULL && !DUK_HOBJECT_IS_CALLABLE(set)) {
goto fail_not_callable;
}
idx_base--;
} else {
set = NULL;
}
if (flags & DUK_DEFPROP_HAVE_GETTER) {
duk_require_type_mask(thr, idx_base, DUK_TYPE_MASK_UNDEFINED |
DUK_TYPE_MASK_OBJECT |
DUK_TYPE_MASK_LIGHTFUNC);
get = duk_get_hobject_promote_lfunc(thr, idx_base);
if (get != NULL && !DUK_HOBJECT_IS_CALLABLE(get)) {
goto fail_not_callable;
}
idx_base--;
} else {
get = NULL;
}
if (flags & DUK_DEFPROP_HAVE_VALUE) {
idx_value = idx_base;
idx_base--;
} else {
idx_value = (duk_idx_t) -1;
}
key = duk_to_property_key_hstring(thr, idx_base);
DUK_ASSERT(key != NULL);
duk_require_valid_index(thr, idx_base);
duk_hobject_define_property_helper(thr,
flags /*defprop_flags*/,
obj,
key,
idx_value,
get,
set,
1 /*throw_flag*/);
/* Clean up stack */
duk_set_top(thr, idx_base);
/* [ ... obj ... ] */
return;
fail_invalid_desc:
DUK_ERROR_TYPE(thr, DUK_STR_INVALID_DESCRIPTOR);
DUK_WO_NORETURN(return;);
fail_not_callable:
DUK_ERROR_TYPE(thr, DUK_STR_NOT_CALLABLE);
DUK_WO_NORETURN(return;);
}
/*
* Object related
*/
DUK_EXTERNAL void duk_compact(duk_hthread *thr, duk_idx_t obj_idx) {
duk_hobject *obj;
DUK_ASSERT_API_ENTRY(thr);
obj = duk_get_hobject(thr, obj_idx);
if (obj) {
/* Note: this may fail, caller should protect the call if necessary */
duk_hobject_compact_props(thr, obj);
}
}
DUK_INTERNAL void duk_compact_m1(duk_hthread *thr) {
DUK_ASSERT_API_ENTRY(thr);
duk_compact(thr, -1);
}
/* XXX: the duk_hobject_enum.c stack APIs should be reworked */
DUK_EXTERNAL void duk_enum(duk_hthread *thr, duk_idx_t obj_idx, duk_uint_t enum_flags) {
DUK_ASSERT_API_ENTRY(thr);
duk_dup(thr, obj_idx);
duk_require_hobject_promote_mask(thr, -1, DUK_TYPE_MASK_LIGHTFUNC | DUK_TYPE_MASK_BUFFER);
duk_hobject_enumerator_create(thr, enum_flags); /* [target] -> [enum] */
}
DUK_EXTERNAL duk_bool_t duk_next(duk_hthread *thr, duk_idx_t enum_index, duk_bool_t get_value) {
DUK_ASSERT_API_ENTRY(thr);
duk_require_hobject(thr, enum_index);
duk_dup(thr, enum_index);
return duk_hobject_enumerator_next(thr, get_value);
}
DUK_INTERNAL void duk_seal_freeze_raw(duk_hthread *thr, duk_idx_t obj_idx, duk_bool_t is_freeze) {
duk_tval *tv;
duk_hobject *h;
DUK_ASSERT_API_ENTRY(thr);
tv = duk_require_tval(thr, obj_idx);
DUK_ASSERT(tv != NULL);
/* Seal/freeze are quite rare in practice so it'd be nice to get the
* correct behavior simply via automatic promotion (at the cost of some
* memory churn). However, the promoted objects don't behave the same,
* e.g. promoted lightfuncs are extensible.
*/
switch (DUK_TVAL_GET_TAG(tv)) {
case DUK_TAG_BUFFER:
/* Plain buffer: already sealed, but not frozen (and can't be frozen
* because index properties can't be made non-writable.
*/
if (is_freeze) {
goto fail_cannot_freeze;
}
break;
case DUK_TAG_LIGHTFUNC:
/* Lightfunc: already sealed and frozen, success. */
break;
case DUK_TAG_OBJECT:
h = DUK_TVAL_GET_OBJECT(tv);
DUK_ASSERT(h != NULL);
if (is_freeze && DUK_HOBJECT_IS_BUFOBJ(h)) {
/* Buffer objects cannot be frozen because there's no internal
* support for making virtual array indices non-writable.
*/
DUK_DD(DUK_DDPRINT("cannot freeze a buffer object"));
goto fail_cannot_freeze;
}
duk_hobject_object_seal_freeze_helper(thr, h, is_freeze);
/* Sealed and frozen objects cannot gain any more properties,
* so this is a good time to compact them.
*/
duk_hobject_compact_props(thr, h);
break;
default:
/* ES2015 Sections 19.1.2.5, 19.1.2.17 */
break;
}
return;
fail_cannot_freeze:
DUK_ERROR_TYPE_INVALID_ARGS(thr); /* XXX: proper error message */
DUK_WO_NORETURN(return;);
}
DUK_EXTERNAL void duk_seal(duk_hthread *thr, duk_idx_t obj_idx) {
DUK_ASSERT_API_ENTRY(thr);
duk_seal_freeze_raw(thr, obj_idx, 0 /*is_freeze*/);
}
DUK_EXTERNAL void duk_freeze(duk_hthread *thr, duk_idx_t obj_idx) {
DUK_ASSERT_API_ENTRY(thr);
duk_seal_freeze_raw(thr, obj_idx, 1 /*is_freeze*/);
}
/*
* Helpers for writing multiple properties
*/
DUK_EXTERNAL void duk_put_function_list(duk_hthread *thr, duk_idx_t obj_idx, const duk_function_list_entry *funcs) {
const duk_function_list_entry *ent = funcs;
DUK_ASSERT_API_ENTRY(thr);
obj_idx = duk_require_normalize_index(thr, obj_idx);
if (ent != NULL) {
while (ent->key != NULL) {
duk_push_c_function(thr, ent->value, ent->nargs);
duk_put_prop_string(thr, obj_idx, ent->key);
ent++;
}
}
}
DUK_EXTERNAL void duk_put_number_list(duk_hthread *thr, duk_idx_t obj_idx, const duk_number_list_entry *numbers) {
const duk_number_list_entry *ent = numbers;
duk_tval *tv;
DUK_ASSERT_API_ENTRY(thr);
obj_idx = duk_require_normalize_index(thr, obj_idx);
if (ent != NULL) {
while (ent->key != NULL) {
tv = thr->valstack_top++;
DUK_ASSERT(DUK_TVAL_IS_UNDEFINED(tv)); /* value stack init policy */
DUK_TVAL_SET_NUMBER_CHKFAST_SLOW(tv, ent->value); /* no need for decref/incref */
duk_put_prop_string(thr, obj_idx, ent->key);
ent++;
}
}
}
/*
* Shortcut for accessing global object properties
*/
DUK_EXTERNAL duk_bool_t duk_get_global_string(duk_hthread *thr, const char *key) {
duk_bool_t ret;
DUK_ASSERT_API_ENTRY(thr);
DUK_ASSERT(thr->builtins[DUK_BIDX_GLOBAL] != NULL);
/* XXX: direct implementation */
duk_push_hobject(thr, thr->builtins[DUK_BIDX_GLOBAL]);
ret = duk_get_prop_string(thr, -1, key);
duk_remove_m2(thr);
return ret;
}
DUK_EXTERNAL duk_bool_t duk_get_global_lstring(duk_hthread *thr, const char *key, duk_size_t key_len) {
duk_bool_t ret;
DUK_ASSERT_API_ENTRY(thr);
DUK_ASSERT(thr->builtins[DUK_BIDX_GLOBAL] != NULL);
/* XXX: direct implementation */
duk_push_hobject(thr, thr->builtins[DUK_BIDX_GLOBAL]);
ret = duk_get_prop_lstring(thr, -1, key, key_len);
duk_remove_m2(thr);
return ret;
}
#if !defined(DUK_USE_PREFER_SIZE)
DUK_EXTERNAL duk_bool_t duk_get_global_literal_raw(duk_hthread *thr, const char *key, duk_size_t key_len) {
duk_bool_t ret;
DUK_ASSERT_API_ENTRY(thr);
DUK_ASSERT(thr->builtins[DUK_BIDX_GLOBAL] != NULL);
DUK_ASSERT(key[key_len] == (char) 0);
/* XXX: direct implementation */
duk_push_hobject(thr, thr->builtins[DUK_BIDX_GLOBAL]);
ret = duk_get_prop_literal_raw(thr, -1, key, key_len);
duk_remove_m2(thr);
return ret;
}
#endif
DUK_EXTERNAL duk_bool_t duk_get_global_heapptr(duk_hthread *thr, void *ptr) {
duk_bool_t ret;
DUK_ASSERT_API_ENTRY(thr);
DUK_ASSERT(thr->builtins[DUK_BIDX_GLOBAL] != NULL);
/* XXX: direct implementation */
duk_push_hobject(thr, thr->builtins[DUK_BIDX_GLOBAL]);
ret = duk_get_prop_heapptr(thr, -1, ptr);
duk_remove_m2(thr);
return ret;
}
DUK_EXTERNAL duk_bool_t duk_put_global_string(duk_hthread *thr, const char *key) {
duk_bool_t ret;
DUK_ASSERT_API_ENTRY(thr);
DUK_ASSERT(thr->builtins[DUK_BIDX_GLOBAL] != NULL);
/* XXX: direct implementation */
duk_push_hobject(thr, thr->builtins[DUK_BIDX_GLOBAL]);
duk_insert(thr, -2);
ret = duk_put_prop_string(thr, -2, key); /* [ ... global val ] -> [ ... global ] */
duk_pop(thr);
return ret;
}
DUK_EXTERNAL duk_bool_t duk_put_global_lstring(duk_hthread *thr, const char *key, duk_size_t key_len) {
duk_bool_t ret;
DUK_ASSERT_API_ENTRY(thr);
DUK_ASSERT(thr->builtins[DUK_BIDX_GLOBAL] != NULL);
/* XXX: direct implementation */
duk_push_hobject(thr, thr->builtins[DUK_BIDX_GLOBAL]);
duk_insert(thr, -2);
ret = duk_put_prop_lstring(thr, -2, key, key_len); /* [ ... global val ] -> [ ... global ] */
duk_pop(thr);
return ret;
}
#if !defined(DUK_USE_PREFER_SIZE)
DUK_EXTERNAL duk_bool_t duk_put_global_literal_raw(duk_hthread *thr, const char *key, duk_size_t key_len) {
duk_bool_t ret;
DUK_ASSERT_API_ENTRY(thr);
DUK_ASSERT(thr->builtins[DUK_BIDX_GLOBAL] != NULL);
DUK_ASSERT(key[key_len] == (char) 0);
/* XXX: direct implementation */
duk_push_hobject(thr, thr->builtins[DUK_BIDX_GLOBAL]);
duk_insert(thr, -2);
ret = duk_put_prop_literal_raw(thr, -2, key, key_len); /* [ ... global val ] -> [ ... global ] */
duk_pop(thr);
return ret;
}
#endif
DUK_EXTERNAL duk_bool_t duk_put_global_heapptr(duk_hthread *thr, void *ptr) {
duk_bool_t ret;
DUK_ASSERT_API_ENTRY(thr);
DUK_ASSERT(thr->builtins[DUK_BIDX_GLOBAL] != NULL);
/* XXX: direct implementation */
duk_push_hobject(thr, thr->builtins[DUK_BIDX_GLOBAL]);
duk_insert(thr, -2);
ret = duk_put_prop_heapptr(thr, -2, ptr); /* [ ... global val ] -> [ ... global ] */
duk_pop(thr);
return ret;
}
/*
* ES2015 GetMethod()
*/
DUK_INTERNAL duk_bool_t duk_get_method_stridx(duk_hthread *thr, duk_idx_t idx, duk_small_uint_t stridx) {
(void) duk_get_prop_stridx(thr, idx, stridx);
if (duk_is_null_or_undefined(thr, -1)) {
duk_pop_nodecref_unsafe(thr);
return 0;
}
if (!duk_is_callable(thr, -1)) {
DUK_ERROR_TYPE(thr, DUK_STR_NOT_CALLABLE);
DUK_WO_NORETURN(return 0;);
}
return 1;
}
/*
* Object prototype
*/
DUK_EXTERNAL void duk_get_prototype(duk_hthread *thr, duk_idx_t idx) {
duk_hobject *obj;
duk_hobject *proto;
DUK_ASSERT_API_ENTRY(thr);
obj = duk_require_hobject(thr, idx);
DUK_ASSERT(obj != NULL);
/* XXX: shared helper for duk_push_hobject_or_undefined()? */
proto = DUK_HOBJECT_GET_PROTOTYPE(thr->heap, obj);
if (proto) {
duk_push_hobject(thr, proto);
} else {
duk_push_undefined(thr);
}
}
DUK_EXTERNAL void duk_set_prototype(duk_hthread *thr, duk_idx_t idx) {
duk_hobject *obj;
duk_hobject *proto;
DUK_ASSERT_API_ENTRY(thr);
obj = duk_require_hobject(thr, idx);
DUK_ASSERT(obj != NULL);
duk_require_type_mask(thr, -1, DUK_TYPE_MASK_UNDEFINED |
DUK_TYPE_MASK_OBJECT);
proto = duk_get_hobject(thr, -1);
/* proto can also be NULL here (allowed explicitly) */
#if defined(DUK_USE_ROM_OBJECTS)
if (DUK_HEAPHDR_HAS_READONLY((duk_heaphdr *) obj)) {
DUK_ERROR_TYPE(thr, DUK_STR_NOT_CONFIGURABLE); /* XXX: "read only object"? */
DUK_WO_NORETURN(return;);
}
#endif
DUK_HOBJECT_SET_PROTOTYPE_UPDREF(thr, obj, proto);
duk_pop(thr);
}
DUK_INTERNAL void duk_clear_prototype(duk_hthread *thr, duk_idx_t idx) {
duk_hobject *obj;
DUK_ASSERT_API_ENTRY(thr);
obj = duk_require_hobject(thr, idx);
DUK_ASSERT(obj != NULL);
#if defined(DUK_USE_ROM_OBJECTS)
if (DUK_HEAPHDR_HAS_READONLY((duk_heaphdr *) obj)) {
DUK_ERROR_TYPE(thr, DUK_STR_NOT_CONFIGURABLE); /* XXX: "read only object"? */
DUK_WO_NORETURN(return;);
}
#endif
DUK_HOBJECT_SET_PROTOTYPE_UPDREF(thr, obj, NULL);
}
DUK_INTERNAL duk_bool_t duk_is_bare_object(duk_hthread *thr, duk_idx_t idx) {
duk_hobject *obj;
duk_hobject *proto;
DUK_ASSERT_API_ENTRY(thr);
obj = duk_require_hobject(thr, idx);
DUK_ASSERT(obj != NULL);
proto = DUK_HOBJECT_GET_PROTOTYPE(thr->heap, obj);
return (proto == NULL);
}
/*
* Object finalizer
*/
#if defined(DUK_USE_FINALIZER_SUPPORT)
/* XXX: these could be implemented as macros calling an internal function
* directly.
* XXX: same issue as with Duktape.fin: there's no way to delete the property
* now (just set it to undefined).
*/
DUK_EXTERNAL void duk_get_finalizer(duk_hthread *thr, duk_idx_t idx) {
DUK_ASSERT_API_ENTRY(thr);
/* This get intentionally walks the inheritance chain at present,
* which matches how the effective finalizer property is also
* looked up in GC.
*/
duk_get_prop_stridx(thr, idx, DUK_STRIDX_INT_FINALIZER);
}
DUK_EXTERNAL void duk_set_finalizer(duk_hthread *thr, duk_idx_t idx) {
duk_hobject *h;
duk_bool_t callable;
DUK_ASSERT_API_ENTRY(thr);
h = duk_require_hobject(thr, idx); /* Get before 'put' so that 'idx' is correct. */
callable = duk_is_callable(thr, -1);
/* At present finalizer is stored as a hidden Symbol, with normal
* inheritance and access control. As a result, finalizer cannot
* currently be set on a non-extensible (sealed or frozen) object.
* It might be useful to allow it.
*/
duk_put_prop_stridx(thr, idx, DUK_STRIDX_INT_FINALIZER);
/* In addition to setting the finalizer property, keep a "have
* finalizer" flag in duk_hobject in sync so that refzero can do
* a very quick finalizer check by walking the prototype chain
* and checking the flag alone. (Note that this means that just
* setting _Finalizer on an object won't affect finalizer checks.)
*
* NOTE: if the argument is a Proxy object, this flag will be set
* on the Proxy, not the target. As a result, the target won't get
* a finalizer flag and the Proxy also won't be finalized as there's
* an explicit Proxy check in finalization now.
*/
if (callable) {
DUK_HOBJECT_SET_HAVE_FINALIZER(h);
} else {
DUK_HOBJECT_CLEAR_HAVE_FINALIZER(h);
}
}
#else /* DUK_USE_FINALIZER_SUPPORT */
DUK_EXTERNAL void duk_get_finalizer(duk_hthread *thr, duk_idx_t idx) {
DUK_ASSERT_API_ENTRY(thr);
DUK_UNREF(idx);
DUK_ERROR_UNSUPPORTED(thr);
DUK_WO_NORETURN(return;);
}
DUK_EXTERNAL void duk_set_finalizer(duk_hthread *thr, duk_idx_t idx) {
DUK_ASSERT_API_ENTRY(thr);
DUK_UNREF(idx);
DUK_ERROR_UNSUPPORTED(thr);
DUK_WO_NORETURN(return;);
}
#endif /* DUK_USE_FINALIZER_SUPPORT */
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