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jerryscript/src/libecmaoperations/ecma-objects-properties.c
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/* Copyright 2014 Samsung Electronics Co., Ltd.
*
* 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-exceptions.h"
#include "ecma-globals.h"
#include "ecma-helpers.h"
#include "ecma-objects-properties.h"
/** \addtogroup ecma ---TODO---
* @{
*
* \addtogroup ecmaobjectsinternalops ECMA objects' operations
* @{
*/
/**
* [[Get]] ecma object's operation
*
* See also:
* ECMA-262 v5, 8.6.2; ECMA-262 v5, Table 8
*
* @return completion value
* Returned value must be freed with ecma_free_completion_value
*/
ecma_completion_value_t
ecma_op_object_get( ecma_object_t *obj_p, /**< the object */
const ecma_char_t *property_name_p) /**< property name */
{
JERRY_ASSERT( obj_p != NULL && !obj_p->is_lexical_environment );
JERRY_ASSERT( property_name_p != NULL );
/*
* ECMA-262 v5, 8.12.3
*
* Common implementation of operation for objects other than Host, Function or Arguments objects.
*/
// 1.
const ecma_property_t* prop_p = ecma_op_object_get_property( obj_p, property_name_p);
// 2.
if ( prop_p == NULL )
{
return ecma_make_simple_completion_value( ECMA_SIMPLE_VALUE_UNDEFINED);
}
// 3.
if ( prop_p->type == ECMA_PROPERTY_NAMEDDATA )
{
return ecma_make_completion_value( ECMA_COMPLETION_TYPE_NORMAL,
ecma_copy_value( prop_p->u.named_data_property.value),
ECMA_TARGET_ID_RESERVED);
}
else
{
// 4.
ecma_object_t *getter = ecma_get_pointer( prop_p->u.named_accessor_property.get_p);
// 5.
if ( getter == NULL )
{
return ecma_make_simple_completion_value( ECMA_SIMPLE_VALUE_UNDEFINED);
}
else
{
/*
* Return result of O.[[Call]];
*/
JERRY_UNIMPLEMENTED();
}
}
JERRY_UNREACHABLE();
} /* ecma_op_object_get */
/**
* [[GetOwnProperty]] ecma object's operation
*
* See also:
* ECMA-262 v5, 8.6.2; ECMA-262 v5, Table 8
*
* @return pointer to a property - if it exists,
* NULL (i.e. ecma-undefined) - otherwise.
*/
ecma_property_t*
ecma_op_object_get_own_property( ecma_object_t *obj_p, /**< the object */
const ecma_char_t *property_name_p) /**< property name */
{
JERRY_ASSERT( obj_p != NULL && !obj_p->is_lexical_environment );
JERRY_ASSERT( property_name_p != NULL );
/*
* ECMA-262 v5, 8.12.2
*
* Common implementation of operation for objects other than Host, Function or Arguments objects.
*/
return ecma_find_named_property( obj_p, property_name_p);
} /* ecma_op_object_get_own_property */
/**
* [[GetProperty]] ecma object's operation
*
* See also:
* ECMA-262 v5, 8.6.2; ECMA-262 v5, Table 8
*
* @return pointer to a property - if it exists,
* NULL (i.e. ecma-undefined) - otherwise.
*/
ecma_property_t*
ecma_op_object_get_property( ecma_object_t *obj_p, /**< the object */
const ecma_char_t *property_name_p) /**< property name */
{
JERRY_ASSERT( obj_p != NULL && !obj_p->is_lexical_environment );
JERRY_ASSERT( property_name_p != NULL );
/*
* ECMA-262 v5, 8.12.2
*
* Common implementation of operation for objects other than Host, Function or Arguments objects.
*/
// 1.
ecma_property_t *prop_p = ecma_op_object_get_own_property( obj_p, property_name_p);
// 2.
if ( prop_p != NULL )
{
return prop_p;
}
// 3.
ecma_object_t *prototype_p = ecma_get_pointer( obj_p->u.object.prototype_object_p);
// 4., 5.
if ( prototype_p != NULL )
{
return ecma_op_object_get_property( prototype_p, property_name_p);
}
else
{
return NULL;
}
} /* ecma_op_object_get_property */
/**
* [[Put]] ecma object's operation
*
* See also:
* ECMA-262 v5, 8.6.2; ECMA-262 v5, Table 8
*
* @return completion value
* Returned value must be freed with ecma_free_completion_value
*/
ecma_completion_value_t
ecma_op_object_put( ecma_object_t *obj_p, /**< the object */
const ecma_char_t *property_name_p, /**< property name */
ecma_value_t value, /**< ecma-value */
bool is_throw) /**< flag that controls failure handling */
{
JERRY_ASSERT( obj_p != NULL && !obj_p->is_lexical_environment );
JERRY_ASSERT( property_name_p != NULL );
// 1.
if ( !ecma_op_object_can_put( obj_p, property_name_p) )
{
if ( is_throw )
{
// a.
return ecma_make_throw_value( ecma_new_standard_error( ECMA_ERROR_TYPE));
}
else
{
// b.
return ecma_make_simple_completion_value( ECMA_SIMPLE_VALUE_FALSE);
}
}
// 2.
ecma_property_t *own_desc_p = ecma_op_object_get_own_property( obj_p, property_name_p);
// 3.
if ( own_desc_p->type == ECMA_PROPERTY_NAMEDDATA )
{
// a.
ecma_property_descriptor_t value_desc = (ecma_property_descriptor_t) {
.is_value_defined = true,
.value = value,
.is_get_defined = false,
.get_p = NULL,
.is_set_defined = false,
.set_p = NULL,
.is_writable_defined = false,
.writable = ECMA_PROPERTY_NOT_WRITABLE,
.is_enumerable_defined = false,
.enumerable = ECMA_PROPERTY_NOT_ENUMERABLE,
.is_configurable_defined = false,
.configurable = ECMA_PROPERTY_NOT_CONFIGURABLE,
};
// b., c.
return ecma_op_object_define_own_property( obj_p,
property_name_p,
value_desc,
is_throw);
}
// 4.
ecma_property_t *desc_p = ecma_op_object_get_property( obj_p, property_name_p);
// 5.
if ( desc_p->type == ECMA_PROPERTY_NAMEDACCESSOR )
{
// a.
ecma_object_t *setter_p = ecma_get_pointer( desc_p->u.named_accessor_property.set_p);
JERRY_ASSERT( setter_p != NULL );
// b.
/*
* setter_p->[[Call]]( obj_p, value);
*/
JERRY_UNIMPLEMENTED();
}
else
{
// 6.
// a.
ecma_property_descriptor_t new_desc = (ecma_property_descriptor_t) {
.is_value_defined = true,
.value = value,
.is_get_defined = false,
.get_p = NULL,
.is_set_defined = false,
.set_p = NULL,
.is_writable_defined = true,
.writable = ECMA_PROPERTY_WRITABLE,
.is_enumerable_defined = true,
.enumerable = ECMA_PROPERTY_ENUMERABLE,
.is_configurable_defined = true,
.configurable = ECMA_PROPERTY_CONFIGURABLE
};
// b.
return ecma_op_object_define_own_property( obj_p,
property_name_p,
new_desc,
is_throw);
}
JERRY_UNREACHABLE();
} /* ecma_op_object_put */
/**
* [[CanPut]] ecma object's operation
*
* See also:
* ECMA-262 v5, 8.6.2; ECMA-262 v5, Table 8
*
* @return true - if [[Put]] with the given property name can be performed;
* false - otherwise.
*/
bool
ecma_op_object_can_put( ecma_object_t *obj_p, /**< the object */
const ecma_char_t *property_name_p) /**< property name */
{
JERRY_ASSERT( obj_p != NULL && !obj_p->is_lexical_environment );
JERRY_ASSERT( property_name_p != NULL );
/*
* ECMA-262 v5, 8.12.2
*
* Common implementation of operation for objects other than Host, Function or Arguments objects.
*/
// 1.
ecma_property_t *prop_p = ecma_op_object_get_own_property( obj_p, property_name_p);
// 2.
if ( prop_p != NULL )
{
// a.
if ( prop_p->type == ECMA_PROPERTY_NAMEDACCESSOR )
{
ecma_object_t *setter_p = ecma_get_pointer( prop_p->u.named_accessor_property.set_p);
// i.
if ( setter_p == NULL )
{
return false;
}
// ii.
return true;
}
else
{
// b.
JERRY_ASSERT( prop_p->type == ECMA_PROPERTY_NAMEDDATA );
return ( prop_p->u.named_data_property.writable == ECMA_PROPERTY_WRITABLE );
}
}
// 3.
ecma_object_t *proto_p = ecma_get_pointer( obj_p->u.object.prototype_object_p);
// 4.
if ( proto_p == NULL )
{
return obj_p->u.object.extensible;
}
// 5.
ecma_property_t *inherited_p = ecma_op_object_get_property( proto_p, property_name_p);
// 6.
if ( inherited_p == NULL )
{
return obj_p->u.object.extensible;
}
// 7.
if ( inherited_p->type == ECMA_PROPERTY_NAMEDACCESSOR )
{
ecma_object_t *setter_p = ecma_get_pointer( inherited_p->u.named_accessor_property.set_p);
// a.
if ( setter_p == NULL )
{
return false;
}
// b.
return true;
}
else
{
// 8.
JERRY_ASSERT( inherited_p->type == ECMA_PROPERTY_NAMEDDATA );
// a.
if ( !obj_p->u.object.extensible )
{
return false;
}
else
{
// b.
return ( inherited_p->u.named_data_property.writable == ECMA_PROPERTY_WRITABLE );
}
}
JERRY_UNREACHABLE();
} /* ecma_op_object_can_put */
/**
* [[HasProperty]] ecma object's operation
*
* See also:
* ECMA-262 v5, 8.6.2; ECMA-262 v5, Table 8
*
* @return true - if the object already has a property with the given property name;
* false - otherwise.
*/
bool
ecma_op_object_has_property( ecma_object_t *obj_p, /**< the object */
const ecma_char_t *property_name_p) /**< property name */
{
JERRY_ASSERT( obj_p != NULL && !obj_p->is_lexical_environment );
JERRY_ASSERT( property_name_p != NULL );
/*
* ECMA-262 v5, 8.12.2
*
* Common implementation of operation for objects other than Host, Function or Arguments objects.
*/
ecma_property_t *desc_p = ecma_op_object_get_property( obj_p, property_name_p);
return ( desc_p != NULL );
} /* ecma_op_object_has_property */
/**
* [[Delete]] ecma object's operation
*
* See also:
* ECMA-262 v5, 8.6.2; ECMA-262 v5, Table 8
*
* @return completion value
* Returned value must be freed with ecma_free_completion_value
*/
ecma_completion_value_t
ecma_op_object_delete( ecma_object_t *obj_p, /**< the object */
const ecma_char_t *property_name_p, /**< property name */
bool is_throw) /**< flag that controls failure handling */
{
JERRY_ASSERT( obj_p != NULL && !obj_p->is_lexical_environment );
JERRY_ASSERT( property_name_p != NULL );
/*
* ECMA-262 v5, 8.12.2
*
* Common implementation of operation for objects other than Host, Function or Arguments objects.
*/
// 1.
ecma_property_t *desc_p = ecma_op_object_get_own_property( obj_p, property_name_p);
// 2.
if ( desc_p == NULL )
{
return ecma_make_simple_completion_value( ECMA_SIMPLE_VALUE_TRUE);
}
// 3.
bool is_configurable;
if ( desc_p->type == ECMA_PROPERTY_NAMEDACCESSOR )
{
is_configurable = desc_p->u.named_accessor_property.configurable;
}
else
{
JERRY_ASSERT( desc_p->type == ECMA_PROPERTY_NAMEDDATA );
is_configurable = desc_p->u.named_data_property.configurable;
}
if ( is_configurable )
{
// a.
ecma_delete_property( obj_p, desc_p);
// b.
return ecma_make_simple_completion_value( ECMA_SIMPLE_VALUE_TRUE);
}
else if ( is_throw )
{
// 4.
return ecma_make_throw_value( ecma_new_standard_error( ECMA_ERROR_TYPE));
}
else
{
// 5.
return ecma_make_simple_completion_value( ECMA_SIMPLE_VALUE_FALSE);
}
JERRY_UNREACHABLE();
} /* ecma_op_object_delete */
/**
* [[DefaultValue]] ecma object's operation
*
* See also:
* ECMA-262 v5, 8.6.2; ECMA-262 v5, Table 8
*
* @return completion value
* Returned value must be freed with ecma_free_completion_value
*/
ecma_completion_value_t
ecma_op_object_default_value( ecma_object_t *obj_p, /**< the object */
ecma_preferred_type_hint_t hint) /**< hint on preferred result type */
{
JERRY_ASSERT( obj_p != NULL && !obj_p->is_lexical_environment );
JERRY_UNIMPLEMENTED_REF_UNUSED_VARS( obj_p, hint);
} /* ecma_op_object_default_value */
/**
* [[DefineOwnProperty]] ecma object's operation
*
* See also:
* ECMA-262 v5, 8.6.2; ECMA-262 v5, Table 8
*
* @return completion value
* Returned value must be freed with ecma_free_completion_value
*/
ecma_completion_value_t
ecma_op_object_define_own_property( ecma_object_t *obj_p, /**< the object */
const ecma_char_t *property_name_p, /**< property name */
ecma_property_descriptor_t property_desc, /**< property descriptor */
bool is_throw) /**< flag that controls failure handling */
{
JERRY_ASSERT( obj_p != NULL && !obj_p->is_lexical_environment );
JERRY_ASSERT( property_name_p != NULL );
const bool is_property_desc_generic_descriptor = ( !property_desc.is_value_defined
&& !property_desc.is_writable_defined
&& !property_desc.is_get_defined
&& !property_desc.is_set_defined );
const bool is_property_desc_data_descriptor = ( property_desc.is_value_defined
|| property_desc.is_writable_defined );
const bool is_property_desc_accessor_descriptor = ( property_desc.is_get_defined
|| property_desc.is_set_defined );
// 1.
ecma_property_t *current_p = ecma_op_object_get_own_property( obj_p, property_name_p);
// 2.
bool extensible = obj_p->u.object.extensible;
if ( current_p == NULL )
{
// 3.
if ( !extensible )
{
// Reject
if ( is_throw )
{
return ecma_make_throw_value( ecma_new_standard_error( ECMA_ERROR_TYPE));
}
else
{
return ecma_make_simple_completion_value( ECMA_SIMPLE_VALUE_FALSE);
}
}
else
{
// 4.
// a.
if ( is_property_desc_generic_descriptor
|| is_property_desc_data_descriptor )
{
ecma_create_named_data_property( obj_p,
property_name_p,
property_desc.writable,
property_desc.enumerable,
property_desc.configurable);
}
else
{
// b.
JERRY_ASSERT( is_property_desc_accessor_descriptor );
ecma_create_named_accessor_property( obj_p,
property_name_p,
property_desc.get_p,
property_desc.set_p,
property_desc.enumerable,
property_desc.configurable);
}
return ecma_make_simple_completion_value( ECMA_SIMPLE_VALUE_TRUE);
}
}
// 5.
if ( is_property_desc_generic_descriptor
&& !property_desc.is_enumerable_defined
&& !property_desc.is_configurable_defined )
{
return ecma_make_simple_completion_value( ECMA_SIMPLE_VALUE_TRUE);
}
// 6.
const bool is_current_data_descriptor = ( current_p->type == ECMA_PROPERTY_NAMEDDATA );
const bool is_current_accessor_descriptor = ( current_p->type == ECMA_PROPERTY_NAMEDACCESSOR );
JERRY_ASSERT( is_current_data_descriptor || is_current_accessor_descriptor );
bool is_every_field_in_desc_also_occurs_in_current_desc_with_same_value = true;
if ( property_desc.is_value_defined )
{
if ( !is_current_data_descriptor
|| !ecma_op_same_value( property_desc.value,
current_p->u.named_data_property.value) )
{
is_every_field_in_desc_also_occurs_in_current_desc_with_same_value = false;
}
}
if ( property_desc.is_writable_defined )
{
if ( !is_current_data_descriptor
|| property_desc.writable != current_p->u.named_data_property.writable )
{
is_every_field_in_desc_also_occurs_in_current_desc_with_same_value = false;
}
}
if ( property_desc.is_get_defined )
{
if ( !is_current_accessor_descriptor
|| property_desc.get_p != ecma_get_pointer( current_p->u.named_accessor_property.get_p) )
{
is_every_field_in_desc_also_occurs_in_current_desc_with_same_value = false;
}
}
if ( property_desc.is_set_defined )
{
if ( !is_current_accessor_descriptor
|| property_desc.set_p != ecma_get_pointer( current_p->u.named_accessor_property.set_p) )
{
is_every_field_in_desc_also_occurs_in_current_desc_with_same_value = false;
}
}
if ( property_desc.is_enumerable_defined )
{
if ( ( is_current_data_descriptor
&& property_desc.enumerable != current_p->u.named_data_property.enumerable )
|| ( is_current_accessor_descriptor
&& property_desc.configurable != current_p->u.named_accessor_property.enumerable ) )
{
is_every_field_in_desc_also_occurs_in_current_desc_with_same_value = false;
}
}
if ( property_desc.is_configurable_defined )
{
if ( ( is_current_data_descriptor
&& property_desc.configurable != current_p->u.named_data_property.configurable )
|| ( is_current_accessor_descriptor
&& property_desc.configurable != current_p->u.named_accessor_property.configurable ) )
{
is_every_field_in_desc_also_occurs_in_current_desc_with_same_value = false;
}
}
if ( is_every_field_in_desc_also_occurs_in_current_desc_with_same_value )
{
return ecma_make_simple_completion_value( ECMA_SIMPLE_VALUE_TRUE);
}
// 7., ...
JERRY_UNIMPLEMENTED();
} /* ecma_op_object_define_own_property */
/**
* @}
* @}
*/
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