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ecma-objects.c
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/* Copyright JS Foundation and other contributors, http://js.foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "ecma-array-object.h"
#include "ecma-builtins.h"
#include "ecma-builtin-helpers.h"
#include "ecma-exceptions.h"
#include "ecma-gc.h"
#include "ecma-globals.h"
#include "ecma-helpers.h"
#include "ecma-function-object.h"
#include "ecma-lex-env.h"
#include "ecma-lcache.h"
#include "ecma-string-object.h"
#include "ecma-arguments-object.h"
#include "ecma-objects-general.h"
#include "ecma-objects.h"
#include "ecma-proxy-object.h"
#include "jcontext.h"
#if ENABLED (JERRY_BUILTIN_TYPEDARRAY)
#include "ecma-typedarray-object.h"
#include "ecma-arraybuffer-object.h"
#endif /* ENABLED (JERRY_BUILTIN_TYPEDARRAY) */
/** \addtogroup ecma ECMA
* @{
*
* \addtogroup ecmaobjectsinternalops ECMA objects' operations
* @{
*/
/**
* Hash bitmap size for ecma objects
*/
#define ECMA_OBJECT_HASH_BITMAP_SIZE 256
/**
* Assert that specified object type value is valid
*
* @param type object's implementation-defined type
*/
#ifndef JERRY_NDEBUG
#define JERRY_ASSERT_OBJECT_TYPE_IS_VALID(type) \
JERRY_ASSERT (type < ECMA_OBJECT_TYPE__MAX);
#else /* JERRY_NDEBUG */
#define JERRY_ASSERT_OBJECT_TYPE_IS_VALID(type)
#endif /* !JERRY_NDEBUG */
/**
* [[GetOwnProperty]] ecma object's operation
*
* See also:
* ECMA-262 v5, 8.6.2; ECMA-262 v5, Table 8
*
* @return property descriptor - if it exists,
* ECMA_PROPERTY_TYPE_NOT_FOUND / ECMA_PROPERTY_TYPE_NOT_FOUND_AND_STOP - otherwise.
*/
ecma_property_t
ecma_op_object_get_own_property (ecma_object_t *object_p, /**< the object */
ecma_string_t *property_name_p, /**< property name */
ecma_property_ref_t *property_ref_p, /**< property reference */
uint32_t options) /**< option bits */
{
JERRY_ASSERT (object_p != NULL
&& !ecma_is_lexical_environment (object_p));
#if ENABLED (JERRY_BUILTIN_PROXY)
JERRY_ASSERT (!ECMA_OBJECT_IS_PROXY (object_p));
#endif /* ENABLED (JERRY_BUILTIN_PROXY) */
JERRY_ASSERT (property_name_p != NULL);
JERRY_ASSERT (options == ECMA_PROPERTY_GET_NO_OPTIONS
|| property_ref_p != NULL);
ecma_object_type_t type = ecma_get_object_type (object_p);
switch (type)
{
case ECMA_OBJECT_TYPE_CLASS:
{
ecma_extended_object_t *ext_object_p = (ecma_extended_object_t *) object_p;
if (ext_object_p->u.class_prop.class_id == LIT_MAGIC_STRING_STRING_UL)
{
if (ecma_string_is_length (property_name_p))
{
if (options & ECMA_PROPERTY_GET_VALUE)
{
ecma_value_t prim_value_p = ext_object_p->u.class_prop.u.value;
ecma_string_t *prim_value_str_p = ecma_get_string_from_value (prim_value_p);
lit_utf8_size_t length = ecma_string_get_length (prim_value_str_p);
property_ref_p->virtual_value = ecma_make_uint32_value (length);
}
return ECMA_PROPERTY_VIRTUAL;
}
uint32_t index = ecma_string_get_array_index (property_name_p);
if (index != ECMA_STRING_NOT_ARRAY_INDEX)
{
ecma_value_t prim_value_p = ext_object_p->u.class_prop.u.value;
ecma_string_t *prim_value_str_p = ecma_get_string_from_value (prim_value_p);
if (index < ecma_string_get_length (prim_value_str_p))
{
if (options & ECMA_PROPERTY_GET_VALUE)
{
ecma_char_t char_at_idx = ecma_string_get_char_at_pos (prim_value_str_p, index);
ecma_string_t *char_str_p = ecma_new_ecma_string_from_code_unit (char_at_idx);
property_ref_p->virtual_value = ecma_make_string_value (char_str_p);
}
return ECMA_PROPERTY_FLAG_ENUMERABLE | ECMA_PROPERTY_VIRTUAL;
}
}
}
break;
}
case ECMA_OBJECT_TYPE_ARRAY:
{
ecma_extended_object_t *ext_object_p = (ecma_extended_object_t *) object_p;
if (ecma_string_is_length (property_name_p))
{
if (options & ECMA_PROPERTY_GET_VALUE)
{
property_ref_p->virtual_value = ecma_make_uint32_value (ext_object_p->u.array.length);
}
uint32_t length_prop = ext_object_p->u.array.length_prop_and_hole_count;
return length_prop & (ECMA_PROPERTY_FLAG_WRITABLE | ECMA_PROPERTY_VIRTUAL);
}
if (ecma_op_array_is_fast_array (ext_object_p))
{
uint32_t index = ecma_string_get_array_index (property_name_p);
if (index != ECMA_STRING_NOT_ARRAY_INDEX)
{
if (JERRY_LIKELY (index < ext_object_p->u.array.length))
{
ecma_value_t *values_p = ECMA_GET_NON_NULL_POINTER (ecma_value_t, object_p->u1.property_list_cp);
if (ecma_is_value_array_hole (values_p[index]))
{
return ECMA_PROPERTY_TYPE_NOT_FOUND;
}
if (options & ECMA_PROPERTY_GET_VALUE)
{
property_ref_p->virtual_value = ecma_fast_copy_value (values_p[index]);
}
return ECMA_PROPERTY_CONFIGURABLE_ENUMERABLE_WRITABLE | ECMA_PROPERTY_VIRTUAL;
}
}
return ECMA_PROPERTY_TYPE_NOT_FOUND;
}
break;
}
#if ENABLED (JERRY_BUILTIN_TYPEDARRAY)
case ECMA_OBJECT_TYPE_PSEUDO_ARRAY:
{
/* ES2015 9.4.5.1 */
if (ecma_object_is_typedarray (object_p))
{
if (ecma_prop_name_is_symbol (property_name_p))
{
break;
}
uint32_t array_index = ecma_string_get_array_index (property_name_p);
if (array_index != ECMA_STRING_NOT_ARRAY_INDEX)
{
ecma_typedarray_info_t info = ecma_typedarray_get_info (object_p);
ecma_value_t value = ECMA_VALUE_UNDEFINED;
if (array_index < info.length)
{
uint32_t byte_pos = array_index << info.shift;
value = ecma_get_typedarray_element (info.buffer_p + byte_pos, info.id);
}
if (!ecma_is_value_undefined (value))
{
if (options & ECMA_PROPERTY_GET_VALUE)
{
property_ref_p->virtual_value = value;
}
else
{
ecma_fast_free_value (value);
}
return ECMA_PROPERTY_ENUMERABLE_WRITABLE | ECMA_PROPERTY_VIRTUAL;
}
return ECMA_PROPERTY_TYPE_NOT_FOUND_AND_STOP;
}
ecma_number_t num = ecma_string_to_number (property_name_p);
ecma_string_t *num_to_str = ecma_new_ecma_string_from_number (num);
if (ecma_compare_ecma_strings (property_name_p, num_to_str))
{
ecma_deref_ecma_string (num_to_str);
return ECMA_PROPERTY_TYPE_NOT_FOUND_AND_STOP;
}
ecma_deref_ecma_string (num_to_str);
}
break;
}
#endif /* ENABLED (JERRY_BUILTIN_TYPEDARRAY) */
default:
{
break;
}
}
ecma_property_t *property_p = ecma_find_named_property (object_p, property_name_p);
if (property_p == NULL)
{
if (ecma_get_object_is_builtin (object_p))
{
if (type == ECMA_OBJECT_TYPE_NATIVE_FUNCTION && ecma_builtin_function_is_routine (object_p))
{
property_p = ecma_builtin_routine_try_to_instantiate_property (object_p, property_name_p);
}
else
{
property_p = ecma_builtin_try_to_instantiate_property (object_p, property_name_p);
}
}
else
{
switch (type)
{
case ECMA_OBJECT_TYPE_FUNCTION:
{
#if !ENABLED (JERRY_ESNEXT)
if (ecma_string_is_length (property_name_p))
{
if (options & ECMA_PROPERTY_GET_VALUE)
{
/* Get length virtual property. */
ecma_extended_object_t *ext_func_p = (ecma_extended_object_t *) object_p;
const ecma_compiled_code_t *bytecode_data_p = ecma_op_function_get_compiled_code (ext_func_p);
uint32_t len;
if (bytecode_data_p->status_flags & CBC_CODE_FLAGS_UINT16_ARGUMENTS)
{
cbc_uint16_arguments_t *args_p = (cbc_uint16_arguments_t *) bytecode_data_p;
len = args_p->argument_end;
}
else
{
cbc_uint8_arguments_t *args_p = (cbc_uint8_arguments_t *) bytecode_data_p;
len = args_p->argument_end;
}
property_ref_p->virtual_value = ecma_make_uint32_value (len);
}
return ECMA_PROPERTY_VIRTUAL;
}
#endif /* !ENABLED (JERRY_ESNEXT) */
/* Get prototype physical property. */
property_p = ecma_op_function_try_to_lazy_instantiate_property (object_p, property_name_p);
break;
}
case ECMA_OBJECT_TYPE_NATIVE_FUNCTION:
{
property_p = ecma_op_external_function_try_to_lazy_instantiate_property (object_p, property_name_p);
break;
}
case ECMA_OBJECT_TYPE_BOUND_FUNCTION:
{
property_p = ecma_op_bound_function_try_to_lazy_instantiate_property (object_p, property_name_p);
break;
}
case ECMA_OBJECT_TYPE_PSEUDO_ARRAY:
{
if (((ecma_extended_object_t *) object_p)->u.pseudo_array.type == ECMA_PSEUDO_ARRAY_ARGUMENTS)
{
property_p = ecma_op_arguments_object_try_to_lazy_instantiate_property (object_p, property_name_p);
}
break;
}
default:
{
break;
}
}
}
if (property_p == NULL)
{
return ECMA_PROPERTY_TYPE_NOT_FOUND;
}
}
else if (type == ECMA_OBJECT_TYPE_PSEUDO_ARRAY
&& ((ecma_extended_object_t *) object_p)->u.pseudo_array.type == ECMA_PSEUDO_ARRAY_ARGUMENTS
&& (((ecma_extended_object_t *) object_p)->u.pseudo_array.extra_info & ECMA_ARGUMENTS_OBJECT_MAPPED))
{
ecma_extended_object_t *ext_object_p = (ecma_extended_object_t *) object_p;
uint32_t index = ecma_string_get_array_index (property_name_p);
if (index < ext_object_p->u.pseudo_array.u1.formal_params_number)
{
ecma_mapped_arguments_t *mapped_arguments_p = (ecma_mapped_arguments_t *) ext_object_p;
ecma_value_t *argv_p = (ecma_value_t *) (mapped_arguments_p + 1);
if (!ecma_is_value_empty (argv_p[index]))
{
#if ENABLED (JERRY_LCACHE)
/* Mapped arguments initialized properties MUST not be lcached */
if (ecma_is_property_lcached (property_p))
{
jmem_cpointer_t prop_name_cp;
if (JERRY_UNLIKELY (ECMA_IS_DIRECT_STRING (property_name_p)))
{
prop_name_cp = (jmem_cpointer_t) ECMA_GET_DIRECT_STRING_VALUE (property_name_p);
}
else
{
ECMA_SET_NON_NULL_POINTER (prop_name_cp, property_name_p);
}
ecma_lcache_invalidate (object_p, prop_name_cp, property_p);
}
#endif /* ENABLED (JERRY_LCACHE) */
ecma_string_t *name_p = ecma_op_arguments_object_get_formal_parameter (mapped_arguments_p, index);
ecma_object_t *lex_env_p = ECMA_GET_INTERNAL_VALUE_POINTER (ecma_object_t, mapped_arguments_p->lex_env);
ecma_value_t binding_value = ecma_op_get_binding_value (lex_env_p, name_p, true);
ecma_named_data_property_assign_value (object_p,
ECMA_PROPERTY_VALUE_PTR (property_p),
binding_value);
ecma_free_value (binding_value);
}
}
}
if (options & ECMA_PROPERTY_GET_EXT_REFERENCE)
{
((ecma_extended_property_ref_t *) property_ref_p)->property_p = property_p;
}
if (property_ref_p != NULL)
{
property_ref_p->value_p = ECMA_PROPERTY_VALUE_PTR (property_p);
}
return *property_p;
} /* ecma_op_object_get_own_property */
/**
* Generic [[HasProperty]] operation
*
* See also:
* ECMAScript v6, 9.1.7.1
*
* @return ECMA_VALUE_ERROR - if the operation fails
* ECMA_VALUE_{TRUE_FALSE} - whether the property is found
*/
extern inline ecma_value_t JERRY_ATTR_ALWAYS_INLINE
ecma_op_object_has_property (ecma_object_t *object_p, /**< the object */
ecma_string_t *property_name_p) /**< property name */
{
while (true)
{
#if ENABLED (JERRY_BUILTIN_PROXY)
if (ECMA_OBJECT_IS_PROXY (object_p))
{
return ecma_proxy_object_has (object_p, property_name_p);
}
#endif /* ENABLED (JERRY_BUILTIN_PROXY) */
/* 2 - 3. */
if (ecma_op_ordinary_object_has_own_property (object_p, property_name_p))
{
return ECMA_VALUE_TRUE;
}
jmem_cpointer_t proto_cp = ecma_op_ordinary_object_get_prototype_of (object_p);
/* 7. */
if (proto_cp == JMEM_CP_NULL)
{
return ECMA_VALUE_FALSE;
}
object_p = ECMA_GET_NON_NULL_POINTER (ecma_object_t, proto_cp);
}
} /* ecma_op_object_has_property */
/**
* Search the value corresponding to a property name
*
* Note: search includes prototypes
*
* @return ecma value if property is found
* ECMA_VALUE_NOT_FOUND if property is not found
* Returned value must be freed with ecma_free_value
*/
ecma_value_t
ecma_op_object_find_own (ecma_value_t base_value, /**< base value */
ecma_object_t *object_p, /**< target object */
ecma_string_t *property_name_p) /**< property name */
{
JERRY_ASSERT (object_p != NULL
&& !ecma_is_lexical_environment (object_p));
JERRY_ASSERT (property_name_p != NULL);
JERRY_ASSERT (!ECMA_OBJECT_IS_PROXY (object_p));
ecma_object_type_t type = ecma_get_object_type (object_p);
switch (type)
{
case ECMA_OBJECT_TYPE_CLASS:
{
ecma_extended_object_t *ext_object_p = (ecma_extended_object_t *) object_p;
if (ext_object_p->u.class_prop.class_id == LIT_MAGIC_STRING_STRING_UL)
{
if (ecma_string_is_length (property_name_p))
{
ecma_value_t prim_value_p = ext_object_p->u.class_prop.u.value;
ecma_string_t *prim_value_str_p = ecma_get_string_from_value (prim_value_p);
lit_utf8_size_t length = ecma_string_get_length (prim_value_str_p);
return ecma_make_uint32_value (length);
}
uint32_t index = ecma_string_get_array_index (property_name_p);
if (index != ECMA_STRING_NOT_ARRAY_INDEX)
{
ecma_value_t prim_value_p = ext_object_p->u.class_prop.u.value;
ecma_string_t *prim_value_str_p = ecma_get_string_from_value (prim_value_p);
if (index < ecma_string_get_length (prim_value_str_p))
{
ecma_char_t char_at_idx = ecma_string_get_char_at_pos (prim_value_str_p, index);
return ecma_make_string_value (ecma_new_ecma_string_from_code_unit (char_at_idx));
}
}
}
break;
}
case ECMA_OBJECT_TYPE_ARRAY:
{
ecma_extended_object_t *ext_object_p = (ecma_extended_object_t *) object_p;
if (ecma_string_is_length (property_name_p))
{
return ecma_make_uint32_value (ext_object_p->u.array.length);
}
if (JERRY_LIKELY (ecma_op_array_is_fast_array (ext_object_p)))
{
uint32_t index = ecma_string_get_array_index (property_name_p);
if (JERRY_LIKELY (index != ECMA_STRING_NOT_ARRAY_INDEX))
{
if (JERRY_LIKELY (index < ext_object_p->u.array.length))
{
ecma_value_t *values_p = ECMA_GET_NON_NULL_POINTER (ecma_value_t, object_p->u1.property_list_cp);
return (ecma_is_value_array_hole (values_p[index]) ? ECMA_VALUE_NOT_FOUND
: ecma_fast_copy_value (values_p[index]));
}
}
return ECMA_VALUE_NOT_FOUND;
}
break;
}
case ECMA_OBJECT_TYPE_PSEUDO_ARRAY:
{
ecma_extended_object_t *ext_object_p = (ecma_extended_object_t *) object_p;
if (ext_object_p->u.pseudo_array.type == ECMA_PSEUDO_ARRAY_ARGUMENTS
&& ext_object_p->u.pseudo_array.extra_info & ECMA_ARGUMENTS_OBJECT_MAPPED)
{
uint32_t index = ecma_string_get_array_index (property_name_p);
if (index < ext_object_p->u.pseudo_array.u1.formal_params_number)
{
ecma_mapped_arguments_t *mapped_arguments_p = (ecma_mapped_arguments_t *) ext_object_p;
ecma_value_t *argv_p = (ecma_value_t *) (mapped_arguments_p + 1);
if (!ecma_is_value_empty (argv_p[index]))
{
ecma_string_t *name_p = ecma_op_arguments_object_get_formal_parameter (mapped_arguments_p, index);
ecma_object_t *lex_env_p = ECMA_GET_INTERNAL_VALUE_POINTER (ecma_object_t, mapped_arguments_p->lex_env);
return ecma_op_get_binding_value (lex_env_p, name_p, true);
}
}
}
#if ENABLED (JERRY_BUILTIN_TYPEDARRAY)
/* ES2015 9.4.5.4 */
if (ecma_object_is_typedarray (object_p))
{
#if ENABLED (JERRY_ESNEXT)
if (ecma_prop_name_is_symbol (property_name_p))
{
break;
}
#endif /* ENABLED (JERRY_ESNEXT) */
uint32_t array_index = ecma_string_get_array_index (property_name_p);
if (array_index != ECMA_STRING_NOT_ARRAY_INDEX)
{
ecma_typedarray_info_t info = ecma_typedarray_get_info (object_p);
if (array_index >= info.length)
{
return ECMA_VALUE_UNDEFINED;
}
uint32_t byte_pos = array_index << info.shift;
return ecma_get_typedarray_element (info.buffer_p + byte_pos, info.id);
}
ecma_number_t num = ecma_string_to_number (property_name_p);
ecma_string_t *num_to_str = ecma_new_ecma_string_from_number (num);
if (ecma_compare_ecma_strings (property_name_p, num_to_str))
{
ecma_deref_ecma_string (num_to_str);
return ECMA_VALUE_UNDEFINED;
}
ecma_deref_ecma_string (num_to_str);
}
#endif /* ENABLED (JERRY_BUILTIN_TYPEDARRAY) */
break;
}
default:
{
break;
}
}
ecma_property_t *property_p = ecma_find_named_property (object_p, property_name_p);
if (property_p == NULL)
{
if (ecma_get_object_is_builtin (object_p))
{
if (type == ECMA_OBJECT_TYPE_NATIVE_FUNCTION && ecma_builtin_function_is_routine (object_p))
{
property_p = ecma_builtin_routine_try_to_instantiate_property (object_p, property_name_p);
}
else
{
property_p = ecma_builtin_try_to_instantiate_property (object_p, property_name_p);
}
}
else
{
switch (type)
{
case ECMA_OBJECT_TYPE_FUNCTION:
{
#if !ENABLED (JERRY_ESNEXT)
if (ecma_string_is_length (property_name_p))
{
/* Get length virtual property. */
ecma_extended_object_t *ext_func_p = (ecma_extended_object_t *) object_p;
const ecma_compiled_code_t *bytecode_data_p = ecma_op_function_get_compiled_code (ext_func_p);
uint32_t len;
if (bytecode_data_p->status_flags & CBC_CODE_FLAGS_UINT16_ARGUMENTS)
{
cbc_uint16_arguments_t *args_p = (cbc_uint16_arguments_t *) bytecode_data_p;
len = args_p->argument_end;
}
else
{
cbc_uint8_arguments_t *args_p = (cbc_uint8_arguments_t *) bytecode_data_p;
len = args_p->argument_end;
}
return ecma_make_uint32_value (len);
}
#endif /* !ENABLED (JERRY_ESNEXT) */
/* Get prototype physical property. */
property_p = ecma_op_function_try_to_lazy_instantiate_property (object_p, property_name_p);
break;
}
case ECMA_OBJECT_TYPE_NATIVE_FUNCTION:
{
property_p = ecma_op_external_function_try_to_lazy_instantiate_property (object_p, property_name_p);
break;
}
case ECMA_OBJECT_TYPE_BOUND_FUNCTION:
{
property_p = ecma_op_bound_function_try_to_lazy_instantiate_property (object_p, property_name_p);
break;
}
case ECMA_OBJECT_TYPE_PSEUDO_ARRAY:
{
if (((ecma_extended_object_t *) object_p)->u.pseudo_array.type == ECMA_PSEUDO_ARRAY_ARGUMENTS)
{
property_p = ecma_op_arguments_object_try_to_lazy_instantiate_property (object_p, property_name_p);
}
break;
}
default:
{
break;
}
}
}
if (property_p == NULL)
{
return ECMA_VALUE_NOT_FOUND;
}
}
JERRY_ASSERT (ECMA_PROPERTY_IS_RAW (*property_p));
ecma_property_value_t *prop_value_p = ECMA_PROPERTY_VALUE_PTR (property_p);
if (*property_p & ECMA_PROPERTY_FLAG_DATA)
{
return ecma_fast_copy_value (prop_value_p->value);
}
ecma_getter_setter_pointers_t *get_set_pair_p = ecma_get_named_accessor_property (prop_value_p);
if (get_set_pair_p->getter_cp == JMEM_CP_NULL)
{
return ECMA_VALUE_UNDEFINED;
}
ecma_object_t *getter_p = ECMA_GET_NON_NULL_POINTER (ecma_object_t, get_set_pair_p->getter_cp);
return ecma_op_function_call (getter_p, base_value, NULL, 0);
} /* ecma_op_object_find_own */
/**
* Search the value corresponding to a property index
*
* Note: this method falls back to the general ecma_op_object_find
*
* @return ecma value if property is found
* ECMA_VALUE_NOT_FOUND if property is not found
* Returned value must be freed with ecma_free_value
*/
ecma_value_t
ecma_op_object_find_by_index (ecma_object_t *object_p, /**< the object */
ecma_length_t index) /**< property index */
{
if (JERRY_LIKELY (index <= ECMA_DIRECT_STRING_MAX_IMM))
{
return ecma_op_object_find (object_p, ECMA_CREATE_DIRECT_UINT32_STRING (index));
}
ecma_string_t *index_str_p = ecma_new_ecma_string_from_length (index);
ecma_value_t ret_value = ecma_op_object_find (object_p, index_str_p);
ecma_deref_ecma_string (index_str_p);
return ret_value;
} /* ecma_op_object_find_by_index */
/**
* Search the value corresponding to a property name
*
* Note: search includes prototypes
*
* @return ecma value if property is found
* ECMA_VALUE_NOT_FOUND if property is not found
* Returned value must be freed with ecma_free_value
*/
ecma_value_t
ecma_op_object_find (ecma_object_t *object_p, /**< the object */
ecma_string_t *property_name_p) /**< property name */
{
ecma_value_t base_value = ecma_make_object_value (object_p);
while (true)
{
#if ENABLED (JERRY_BUILTIN_PROXY)
if (ECMA_OBJECT_IS_PROXY (object_p))
{
return ecma_proxy_object_find (object_p, property_name_p);
}
#endif /* ENABLED (JERRY_BUILTIN_PROXY) */
ecma_value_t value = ecma_op_object_find_own (base_value, object_p, property_name_p);
if (ecma_is_value_found (value))
{
return value;
}
if (object_p->u2.prototype_cp == JMEM_CP_NULL)
{
break;
}
object_p = ECMA_GET_NON_NULL_POINTER (ecma_object_t, object_p->u2.prototype_cp);
}
return ECMA_VALUE_NOT_FOUND;
} /* ecma_op_object_find */
/**
* [[Get]] operation of ecma object
*
* This function returns the value of a named property, or undefined
* if the property is not found in the prototype chain. If the property
* is an accessor, it calls the "get" callback function and returns
* with its result (including error throws).
*
* See also:
* ECMA-262 v5, 8.6.2; ECMA-262 v5, Table 8
*
* @return ecma value
* Returned value must be freed with ecma_free_value
*/
extern inline ecma_value_t JERRY_ATTR_ALWAYS_INLINE
ecma_op_object_get (ecma_object_t *object_p, /**< the object */
ecma_string_t *property_name_p) /**< property name */
{
return ecma_op_object_get_with_receiver (object_p, property_name_p, ecma_make_object_value (object_p));
} /* ecma_op_object_get */
/**
* [[Get]] operation of ecma object with the specified receiver
*
* This function returns the value of a named property, or undefined
* if the property is not found in the prototype chain. If the property
* is an accessor, it calls the "get" callback function and returns
* with its result (including error throws).
*
* See also:
* ECMA-262 v5, 8.6.2; ECMA-262 v5, Table 8
*
* @return ecma value
* Returned value must be freed with ecma_free_value
*/
ecma_value_t
ecma_op_object_get_with_receiver (ecma_object_t *object_p, /**< the object */
ecma_string_t *property_name_p, /**< property name */
ecma_value_t receiver) /**< receiver to invoke getter function */
{
while (true)
{
#if ENABLED (JERRY_BUILTIN_PROXY)
if (ECMA_OBJECT_IS_PROXY (object_p))
{
return ecma_proxy_object_get (object_p, property_name_p, receiver);
}
#endif /* ENABLED (JERRY_BUILTIN_PROXY) */
ecma_value_t value = ecma_op_object_find_own (receiver, object_p, property_name_p);
if (ecma_is_value_found (value))
{
return value;
}
jmem_cpointer_t proto_cp = ecma_op_ordinary_object_get_prototype_of (object_p);
if (proto_cp == JMEM_CP_NULL)
{
break;
}
object_p = ECMA_GET_NON_NULL_POINTER (ecma_object_t, proto_cp);
}
return ECMA_VALUE_UNDEFINED;
} /* ecma_op_object_get_with_receiver */
/**
* [[Get]] operation of ecma object specified for property index
*
* @return ecma value
* Returned value must be freed with ecma_free_value
*/
ecma_value_t
ecma_op_object_get_by_index (ecma_object_t *object_p, /**< the object */
ecma_length_t index) /**< property index */
{
if (JERRY_LIKELY (index <= ECMA_DIRECT_STRING_MAX_IMM))
{
return ecma_op_object_get (object_p, ECMA_CREATE_DIRECT_UINT32_STRING (index));
}
ecma_string_t *index_str_p = ecma_new_ecma_string_from_length (index);
ecma_value_t ret_value = ecma_op_object_get (object_p, index_str_p);
ecma_deref_ecma_string (index_str_p);
return ret_value;
} /* ecma_op_object_get_by_index */
/**
* Perform ToLength(O.[[Get]]("length")) operation
*
* The property is converted to uint32 during the operation
*
* @return ECMA_VALUE_ERROR - if there was any error during the operation
* ECMA_VALUE_EMPTY - otherwise
*/
ecma_value_t
ecma_op_object_get_length (ecma_object_t *object_p, /**< the object */
ecma_length_t *length_p) /**< [out] length value converted to uint32 */
{
if (JERRY_LIKELY (ecma_get_object_type (object_p) == ECMA_OBJECT_TYPE_ARRAY))
{
*length_p = (ecma_length_t) ecma_array_get_length (object_p);
return ECMA_VALUE_EMPTY;
}
ecma_value_t len_value = ecma_op_object_get_by_magic_id (object_p, LIT_MAGIC_STRING_LENGTH);
ecma_value_t len_number = ecma_op_to_length (len_value, length_p);
ecma_free_value (len_value);
JERRY_ASSERT (ECMA_IS_VALUE_ERROR (len_number) || ecma_is_value_empty (len_number));
return len_number;
} /* ecma_op_object_get_length */
/**
* [[Get]] operation of ecma object where the property name is a magic string
*
* This function returns the value of a named property, or undefined
* if the property is not found in the prototype chain. If the property
* is an accessor, it calls the "get" callback function and returns
* with its result (including error throws).
*
* See also:
* ECMA-262 v5, 8.6.2; ECMA-262 v5, Table 8
*
* @return ecma value
* Returned value must be freed with ecma_free_value
*/
extern inline ecma_value_t JERRY_ATTR_ALWAYS_INLINE
ecma_op_object_get_by_magic_id (ecma_object_t *object_p, /**< the object */
lit_magic_string_id_t property_id) /**< property magic string id */
{
return ecma_op_object_get (object_p, ecma_get_magic_string (property_id));
} /* ecma_op_object_get_by_magic_id */
#if ENABLED (JERRY_ESNEXT)
/**
* Descriptor string for each global symbol
*/
static const uint16_t ecma_global_symbol_descriptions[] =
{
LIT_MAGIC_STRING_ASYNC_ITERATOR,
LIT_MAGIC_STRING_HAS_INSTANCE,
LIT_MAGIC_STRING_IS_CONCAT_SPREADABLE,
LIT_MAGIC_STRING_ITERATOR,
LIT_MAGIC_STRING_MATCH,
LIT_MAGIC_STRING_REPLACE,
LIT_MAGIC_STRING_SEARCH,
LIT_MAGIC_STRING_SPECIES,
LIT_MAGIC_STRING_SPLIT,
LIT_MAGIC_STRING_TO_PRIMITIVE,
LIT_MAGIC_STRING_TO_STRING_TAG,
LIT_MAGIC_STRING_UNSCOPABLES
};
JERRY_STATIC_ASSERT (sizeof (ecma_global_symbol_descriptions) / sizeof (uint16_t) == ECMA_BUILTIN_GLOBAL_SYMBOL_COUNT,
ecma_global_symbol_descriptions_must_have_global_symbol_count_elements);
/**
* [[Get]] a well-known symbol by the given property id
*
* @return pointer to the requested well-known symbol
*/
ecma_string_t *
ecma_op_get_global_symbol (lit_magic_string_id_t property_id) /**< property symbol id */
{
JERRY_ASSERT (LIT_IS_GLOBAL_SYMBOL (property_id));
uint32_t symbol_index = (uint32_t) property_id - (uint32_t) LIT_GLOBAL_SYMBOL__FIRST;
jmem_cpointer_t symbol_cp = JERRY_CONTEXT (global_symbols_cp)[symbol_index];
if (symbol_cp != JMEM_CP_NULL)
{
ecma_string_t *symbol_p = ECMA_GET_NON_NULL_POINTER (ecma_string_t, symbol_cp);
ecma_ref_ecma_string (symbol_p);
return symbol_p;
}
ecma_string_t *symbol_dot_p = ecma_get_magic_string (LIT_MAGIC_STRING_SYMBOL_DOT_UL);
uint16_t description = ecma_global_symbol_descriptions[symbol_index];
ecma_string_t *name_p = ecma_get_magic_string ((lit_magic_string_id_t) description);
ecma_string_t *descriptor_p = ecma_concat_ecma_strings (symbol_dot_p, name_p);
ecma_string_t *symbol_p = ecma_new_symbol_from_descriptor_string (ecma_make_string_value (descriptor_p));
symbol_p->u.hash = (uint16_t) ((property_id << ECMA_GLOBAL_SYMBOL_SHIFT) | ECMA_GLOBAL_SYMBOL_FLAG);
ECMA_SET_NON_NULL_POINTER (JERRY_CONTEXT (global_symbols_cp)[symbol_index], symbol_p);
ecma_ref_ecma_string (symbol_p);
return symbol_p;
} /* ecma_op_get_global_symbol */
/**
* [[Get]] operation of ecma object where the property is a well-known symbol
*
* @return ecma value
* Returned value must be freed with ecma_free_value
*/
ecma_value_t
ecma_op_object_get_by_symbol_id (ecma_object_t *object_p, /**< the object */
lit_magic_string_id_t property_id) /**< property symbol id */
{
ecma_string_t *symbol_p = ecma_op_get_global_symbol (property_id);
ecma_value_t ret_value = ecma_op_object_get (object_p, symbol_p);
ecma_deref_ecma_string (symbol_p);
return ret_value;
} /* ecma_op_object_get_by_symbol_id */
/**
* GetMethod operation
*
* See also: ECMA-262 v6, 7.3.9
*
* Note:
* Returned value must be freed with ecma_free_value.
*
* @return iterator function object - if success
* raised error - otherwise
*/
static ecma_value_t
ecma_op_get_method (ecma_value_t value, /**< ecma value */
ecma_string_t *prop_name_p) /** property name */
{
/* 2. */
ecma_value_t obj_value = ecma_op_to_object (value);
if (ECMA_IS_VALUE_ERROR (obj_value))
{
return obj_value;
}
ecma_object_t *obj_p = ecma_get_object_from_value (obj_value);
ecma_value_t func;
func = ecma_op_object_get (obj_p, prop_name_p);
ecma_deref_object (obj_p);
/* 3. */
if (ECMA_IS_VALUE_ERROR (func))
{
return func;
}
/* 4. */
if (ecma_is_value_undefined (func) || ecma_is_value_null (func))
{
return ECMA_VALUE_UNDEFINED;
}
/* 5. */