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jerryscript/jerry-core/ecma/operations/ecma-conversion.c
Tilmann Scheller 0511091e8a Streamline copyright notices across the codebase. (#1473) 
Since the project is now hosted at the JS Foundation we can move to unified copyright notices for the project.

Starting with this commit all future contributions to the project should only carry the following copyright notice (except for third-party code which requires copyright information to be preserved):

"Copyright JS Foundation and other contributors, http://js.foundation" (without the quotes)

This avoids cluttering the codebase with contributor-specific copyright notices which have a higher maintenance overhead and tend to get outdated quickly. Also dropping the year from the copyright notices helps to avoid yearly code changes just to update the copyright notices.

Note that each contributor still retains full copyright ownership of his/her contributions and the respective authorship is tracked very accurately via Git.

JerryScript-DCO-1.0-Signed-off-by: Tilmann Scheller t.scheller@samsung.com
2016-12-08 06:39:11 +01:00

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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.
*/
/**
* Implementation of ECMA-defined conversion routines
*/
#include "ecma-alloc.h"
#include "ecma-boolean-object.h"
#include "ecma-conversion.h"
#include "ecma-exceptions.h"
#include "ecma-function-object.h"
#include "ecma-gc.h"
#include "ecma-globals.h"
#include "ecma-helpers.h"
#include "ecma-number-object.h"
#include "ecma-objects.h"
#include "ecma-objects-general.h"
#include "ecma-string-object.h"
#include "ecma-try-catch-macro.h"
#include "jrt-libc-includes.h"
/** \addtogroup ecma ECMA
* @{
*
* \addtogroup ecmaconversion ECMA conversion routines
* @{
*/
/**
* CheckObjectCoercible operation.
*
* See also:
* ECMA-262 v5, 9.10
*
* @return ecma value
* Returned value must be freed with ecma_free_value
*/
ecma_value_t
ecma_op_check_object_coercible (ecma_value_t value) /**< ecma value */
{
ecma_check_value_type_is_spec_defined (value);
if (ecma_is_value_undefined (value)
|| ecma_is_value_null (value))
{
return ecma_raise_type_error (ECMA_ERR_MSG ("Argument cannot be converted to an object."));
}
else
{
return ecma_make_simple_value (ECMA_SIMPLE_VALUE_EMPTY);
}
} /* ecma_op_check_object_coercible */
/**
* SameValue operation.
*
* See also:
* ECMA-262 v5, 9.12
*
* @return true - if the value are same according to ECMA-defined SameValue algorithm,
* false - otherwise.
*/
bool
ecma_op_same_value (ecma_value_t x, /**< ecma value */
ecma_value_t y) /**< ecma value */
{
const bool is_x_undefined = ecma_is_value_undefined (x);
const bool is_x_null = ecma_is_value_null (x);
const bool is_x_boolean = ecma_is_value_boolean (x);
const bool is_x_number = ecma_is_value_number (x);
const bool is_x_string = ecma_is_value_string (x);
const bool is_x_object = ecma_is_value_object (x);
const bool is_y_undefined = ecma_is_value_undefined (y);
const bool is_y_null = ecma_is_value_null (y);
const bool is_y_boolean = ecma_is_value_boolean (y);
const bool is_y_number = ecma_is_value_number (y);
const bool is_y_string = ecma_is_value_string (y);
const bool is_y_object = ecma_is_value_object (y);
const bool is_types_equal = ((is_x_undefined && is_y_undefined)
|| (is_x_null && is_y_null)
|| (is_x_boolean && is_y_boolean)
|| (is_x_number && is_y_number)
|| (is_x_string && is_y_string)
|| (is_x_object && is_y_object));
if (!is_types_equal)
{
return false;
}
else if (is_x_undefined || is_x_null)
{
return true;
}
else if (is_x_number)
{
ecma_number_t x_num = ecma_get_number_from_value (x);
ecma_number_t y_num = ecma_get_number_from_value (y);
bool is_x_nan = ecma_number_is_nan (x_num);
bool is_y_nan = ecma_number_is_nan (y_num);
if (is_x_nan || is_y_nan)
{
/*
* If both are NaN
* return true;
* else
* one of the numbers is NaN, and another - is not
* return false;
*/
return (is_x_nan && is_y_nan);
}
else if (ecma_number_is_zero (x_num)
&& ecma_number_is_zero (y_num)
&& ecma_number_is_negative (x_num) != ecma_number_is_negative (y_num))
{
return false;
}
else
{
return (x_num == y_num);
}
}
else if (is_x_string)
{
ecma_string_t *x_str_p = ecma_get_string_from_value (x);
ecma_string_t *y_str_p = ecma_get_string_from_value (y);
return ecma_compare_ecma_strings (x_str_p, y_str_p);
}
else if (is_x_boolean)
{
return (ecma_is_value_true (x) == ecma_is_value_true (y));
}
else
{
JERRY_ASSERT (is_x_object);
return (ecma_get_object_from_value (x) == ecma_get_object_from_value (y));
}
} /* ecma_op_same_value */
/**
* ToPrimitive operation.
*
* See also:
* ECMA-262 v5, 9.1
*
* @return ecma value
* Returned value must be freed with ecma_free_value
*/
ecma_value_t
ecma_op_to_primitive (ecma_value_t value, /**< ecma value */
ecma_preferred_type_hint_t preferred_type) /**< preferred type hint */
{
ecma_check_value_type_is_spec_defined (value);
if (ecma_is_value_object (value))
{
ecma_object_t *obj_p = ecma_get_object_from_value (value);
return ecma_op_object_default_value (obj_p, preferred_type);
}
else
{
return ecma_copy_value (value);
}
} /* ecma_op_to_primitive */
/**
* ToBoolean operation. Cannot throw an exception.
*
* See also:
* ECMA-262 v5, 9.2
*
* @return true if the logical value is true
* false otherwise
*/
bool
ecma_op_to_boolean (ecma_value_t value) /**< ecma value */
{
ecma_check_value_type_is_spec_defined (value);
if (ecma_is_value_simple (value))
{
JERRY_ASSERT (ecma_is_value_boolean (value)
|| ecma_is_value_undefined (value)
|| ecma_is_value_null (value));
return ecma_is_value_true (value);
}
if (ecma_is_value_integer_number (value))
{
return (value != ecma_make_integer_value (0));
}
if (ecma_is_value_float_number (value))
{
ecma_number_t num = ecma_get_float_from_value (value);
return (!ecma_number_is_nan (num) && !ecma_number_is_zero (num));
}
if (ecma_is_value_string (value))
{
ecma_string_t *str_p = ecma_get_string_from_value (value);
return !ecma_string_is_empty (str_p);
}
JERRY_ASSERT (ecma_is_value_object (value));
return true;
} /* ecma_op_to_boolean */
/**
* ToNumber operation.
*
* See also:
* ECMA-262 v5, 9.3
*
* @return ecma value
* Returned value must be freed with ecma_free_value
*/
ecma_value_t
ecma_op_to_number (ecma_value_t value) /**< ecma value */
{
ecma_check_value_type_is_spec_defined (value);
if (ecma_is_value_integer_number (value))
{
return value;
}
else if (ecma_is_value_float_number (value))
{
return ecma_copy_value (value);
}
else if (ecma_is_value_string (value))
{
ecma_string_t *str_p = ecma_get_string_from_value (value);
return ecma_make_number_value (ecma_string_to_number (str_p));
}
else if (ecma_is_value_object (value))
{
ecma_value_t ret_value = ecma_make_simple_value (ECMA_SIMPLE_VALUE_EMPTY);
ECMA_TRY_CATCH (primitive_value,
ecma_op_to_primitive (value, ECMA_PREFERRED_TYPE_NUMBER),
ret_value);
ret_value = ecma_op_to_number (primitive_value);
ECMA_FINALIZE (primitive_value);
return ret_value;
}
else
{
int16_t num = 0;
if (ecma_is_value_undefined (value))
{
return ecma_make_nan_value ();
}
else if (ecma_is_value_null (value))
{
num = 0;
}
else
{
JERRY_ASSERT (ecma_is_value_boolean (value));
if (ecma_is_value_true (value))
{
num = 1;
}
else
{
num = 0;
}
}
return ecma_make_integer_value (num);
}
} /* ecma_op_to_number */
/**
* ToString operation.
*
* See also:
* ECMA-262 v5, 9.8
*
* @return ecma value
* Returned value must be freed with ecma_free_value
*/
ecma_value_t
ecma_op_to_string (ecma_value_t value) /**< ecma value */
{
ecma_check_value_type_is_spec_defined (value);
if (unlikely (ecma_is_value_object (value)))
{
ecma_value_t ret_value = ecma_make_simple_value (ECMA_SIMPLE_VALUE_EMPTY);
ECMA_TRY_CATCH (prim_value,
ecma_op_to_primitive (value, ECMA_PREFERRED_TYPE_STRING),
ret_value);
ret_value = ecma_op_to_string (prim_value);
ECMA_FINALIZE (prim_value);
return ret_value;
}
else
{
ecma_string_t *res_p = NULL;
if (ecma_is_value_string (value))
{
res_p = ecma_get_string_from_value (value);
ecma_ref_ecma_string (res_p);
}
else if (ecma_is_value_integer_number (value))
{
ecma_integer_value_t num = ecma_get_integer_from_value (value);
if (num < 0)
{
res_p = ecma_new_ecma_string_from_number ((ecma_number_t) num);
}
else
{
res_p = ecma_new_ecma_string_from_uint32 ((uint32_t) num);
}
}
else if (ecma_is_value_float_number (value))
{
ecma_number_t num = ecma_get_float_from_value (value);
res_p = ecma_new_ecma_string_from_number (num);
}
else if (ecma_is_value_undefined (value))
{
res_p = ecma_get_magic_string (LIT_MAGIC_STRING_UNDEFINED);
}
else if (ecma_is_value_null (value))
{
res_p = ecma_get_magic_string (LIT_MAGIC_STRING_NULL);
}
else
{
JERRY_ASSERT (ecma_is_value_boolean (value));
if (ecma_is_value_true (value))
{
res_p = ecma_get_magic_string (LIT_MAGIC_STRING_TRUE);
}
else
{
res_p = ecma_get_magic_string (LIT_MAGIC_STRING_FALSE);
}
}
return ecma_make_string_value (res_p);
}
} /* ecma_op_to_string */
/**
* ToObject operation.
*
* See also:
* ECMA-262 v5, 9.9
*
* @return ecma value
* Returned value must be freed with ecma_free_value
*/
ecma_value_t
ecma_op_to_object (ecma_value_t value) /**< ecma value */
{
ecma_check_value_type_is_spec_defined (value);
if (ecma_is_value_number (value))
{
return ecma_op_create_number_object (value);
}
else if (ecma_is_value_string (value))
{
return ecma_op_create_string_object (&value, 1);
}
else if (ecma_is_value_object (value))
{
return ecma_copy_value (value);
}
else
{
if (ecma_is_value_undefined (value)
|| ecma_is_value_null (value))
{
return ecma_raise_type_error (ECMA_ERR_MSG ("Argument cannot be converted to an object."));
}
else
{
JERRY_ASSERT (ecma_is_value_boolean (value));
return ecma_op_create_boolean_object (value);
}
}
} /* ecma_op_to_object */
/**
* FromPropertyDescriptor operation.
*
* See also:
* ECMA-262 v5, 8.10.4
*
* @return constructed object
*/
ecma_object_t *
ecma_op_from_property_descriptor (const ecma_property_descriptor_t *src_prop_desc_p) /**< property descriptor */
{
/* 2. */
ecma_object_t *obj_p = ecma_op_create_object_object_noarg ();
ecma_value_t completion;
ecma_property_descriptor_t prop_desc = ecma_make_empty_property_descriptor ();
{
prop_desc.is_value_defined = true;
prop_desc.is_writable_defined = true;
prop_desc.is_writable = true;
prop_desc.is_enumerable_defined = true;
prop_desc.is_enumerable = true;
prop_desc.is_configurable_defined = true;
prop_desc.is_configurable = true;
}
/* 3. */
if (src_prop_desc_p->is_value_defined
|| src_prop_desc_p->is_writable_defined)
{
JERRY_ASSERT (prop_desc.is_value_defined && prop_desc.is_writable_defined);
/* a. */
prop_desc.value = src_prop_desc_p->value;
ecma_string_t *value_magic_string_p = ecma_get_magic_string (LIT_MAGIC_STRING_VALUE);
completion = ecma_op_object_define_own_property (obj_p,
value_magic_string_p,
&prop_desc,
false);
ecma_deref_ecma_string (value_magic_string_p);
JERRY_ASSERT (ecma_is_value_true (completion));
/* b. */
const bool is_writable = (src_prop_desc_p->is_writable);
prop_desc.value = ecma_make_boolean_value (is_writable);
ecma_string_t *writable_magic_string_p = ecma_get_magic_string (LIT_MAGIC_STRING_WRITABLE);
completion = ecma_op_object_define_own_property (obj_p,
writable_magic_string_p,
&prop_desc,
false);
ecma_deref_ecma_string (writable_magic_string_p);
JERRY_ASSERT (ecma_is_value_true (completion));
}
else
{
/* 4. */
JERRY_ASSERT (src_prop_desc_p->is_get_defined
|| src_prop_desc_p->is_set_defined);
/* a. */
if (src_prop_desc_p->get_p == NULL)
{
prop_desc.value = ecma_make_simple_value (ECMA_SIMPLE_VALUE_UNDEFINED);
}
else
{
prop_desc.value = ecma_make_object_value (src_prop_desc_p->get_p);
}
ecma_string_t *get_magic_string_p = ecma_get_magic_string (LIT_MAGIC_STRING_GET);
completion = ecma_op_object_define_own_property (obj_p,
get_magic_string_p,
&prop_desc,
false);
ecma_deref_ecma_string (get_magic_string_p);
JERRY_ASSERT (ecma_is_value_true (completion));
/* b. */
if (src_prop_desc_p->set_p == NULL)
{
prop_desc.value = ecma_make_simple_value (ECMA_SIMPLE_VALUE_UNDEFINED);
}
else
{
prop_desc.value = ecma_make_object_value (src_prop_desc_p->set_p);
}
ecma_string_t *set_magic_string_p = ecma_get_magic_string (LIT_MAGIC_STRING_SET);
completion = ecma_op_object_define_own_property (obj_p,
set_magic_string_p,
&prop_desc,
false);
ecma_deref_ecma_string (set_magic_string_p);
JERRY_ASSERT (ecma_is_value_true (completion));
}
const bool is_enumerable = src_prop_desc_p->is_enumerable;
prop_desc.value = ecma_make_boolean_value (is_enumerable);
ecma_string_t *enumerable_magic_string_p = ecma_get_magic_string (LIT_MAGIC_STRING_ENUMERABLE);
completion = ecma_op_object_define_own_property (obj_p,
enumerable_magic_string_p,
&prop_desc,
false);
ecma_deref_ecma_string (enumerable_magic_string_p);
JERRY_ASSERT (ecma_is_value_true (completion));
const bool is_configurable = src_prop_desc_p->is_configurable;
prop_desc.value = ecma_make_boolean_value (is_configurable);
ecma_string_t *configurable_magic_string_p = ecma_get_magic_string (LIT_MAGIC_STRING_CONFIGURABLE);
completion = ecma_op_object_define_own_property (obj_p,
configurable_magic_string_p,
&prop_desc,
false);
ecma_deref_ecma_string (configurable_magic_string_p);
JERRY_ASSERT (ecma_is_value_true (completion));
return obj_p;
} /* ecma_op_from_property_descriptor */
/**
* ToPropertyDescriptor operation.
*
* See also:
* ECMA-262 v5, 8.10.5
*
* @return ecma value
* Returned value must be freed with ecma_free_value
*/
ecma_value_t
ecma_op_to_property_descriptor (ecma_value_t obj_value, /**< object value */
ecma_property_descriptor_t *out_prop_desc_p) /**< [out] filled property descriptor
if return value is normal
empty completion value */
{
ecma_value_t ret_value = ecma_make_simple_value (ECMA_SIMPLE_VALUE_EMPTY);
/* 1. */
if (!ecma_is_value_object (obj_value))
{
ret_value = ecma_raise_type_error (ECMA_ERR_MSG ("Expected an object."));
}
else
{
ecma_object_t *obj_p = ecma_get_object_from_value (obj_value);
/* 2. */
ecma_property_descriptor_t prop_desc = ecma_make_empty_property_descriptor ();
/* 3. */
ecma_string_t *enumerable_magic_string_p = ecma_get_magic_string (LIT_MAGIC_STRING_ENUMERABLE);
ECMA_TRY_CATCH (enumerable_prop_value,
ecma_op_object_find (obj_p, enumerable_magic_string_p),
ret_value);
if (ecma_is_value_found (enumerable_prop_value))
{
prop_desc.is_enumerable_defined = true;
prop_desc.is_enumerable = ecma_op_to_boolean (enumerable_prop_value);
}
ECMA_FINALIZE (enumerable_prop_value);
ecma_deref_ecma_string (enumerable_magic_string_p);
if (!ECMA_IS_VALUE_ERROR (ret_value))
{
JERRY_ASSERT (ecma_is_value_empty (ret_value));
/* 4. */
ecma_string_t *configurable_magic_string_p = ecma_get_magic_string (LIT_MAGIC_STRING_CONFIGURABLE);
ECMA_TRY_CATCH (configurable_prop_value,
ecma_op_object_find (obj_p, configurable_magic_string_p),
ret_value);
if (ecma_is_value_found (configurable_prop_value))
{
prop_desc.is_configurable_defined = true;
prop_desc.is_configurable = ecma_op_to_boolean (configurable_prop_value);
}
ECMA_FINALIZE (configurable_prop_value);
ecma_deref_ecma_string (configurable_magic_string_p);
}
if (!ECMA_IS_VALUE_ERROR (ret_value))
{
JERRY_ASSERT (ecma_is_value_empty (ret_value));
/* 5. */
ecma_string_t *value_magic_string_p = ecma_get_magic_string (LIT_MAGIC_STRING_VALUE);
ECMA_TRY_CATCH (value_prop_value,
ecma_op_object_find (obj_p, value_magic_string_p),
ret_value);
if (ecma_is_value_found (value_prop_value))
{
prop_desc.is_value_defined = true;
prop_desc.value = ecma_copy_value (value_prop_value);
}
ECMA_FINALIZE (value_prop_value);
ecma_deref_ecma_string (value_magic_string_p);
}
if (!ECMA_IS_VALUE_ERROR (ret_value))
{
JERRY_ASSERT (ecma_is_value_empty (ret_value));
/* 6. */
ecma_string_t *writable_magic_string_p = ecma_get_magic_string (LIT_MAGIC_STRING_WRITABLE);
ECMA_TRY_CATCH (writable_prop_value,
ecma_op_object_find (obj_p, writable_magic_string_p),
ret_value);
if (ecma_is_value_found (writable_prop_value))
{
prop_desc.is_writable_defined = true;
prop_desc.is_writable = ecma_op_to_boolean (writable_prop_value);
}
ECMA_FINALIZE (writable_prop_value);
ecma_deref_ecma_string (writable_magic_string_p);
}
if (!ECMA_IS_VALUE_ERROR (ret_value))
{
JERRY_ASSERT (ecma_is_value_empty (ret_value));
/* 7. */
ecma_string_t *get_magic_string_p = ecma_get_magic_string (LIT_MAGIC_STRING_GET);
ECMA_TRY_CATCH (get_prop_value,
ecma_op_object_find (obj_p, get_magic_string_p),
ret_value);
if (ecma_is_value_found (get_prop_value))
{
if (!ecma_op_is_callable (get_prop_value)
&& !ecma_is_value_undefined (get_prop_value))
{
ret_value = ecma_raise_type_error (ECMA_ERR_MSG ("Expected a function."));
}
else
{
prop_desc.is_get_defined = true;
if (ecma_is_value_undefined (get_prop_value))
{
prop_desc.get_p = NULL;
}
else
{
JERRY_ASSERT (ecma_is_value_object (get_prop_value));
ecma_object_t *get_p = ecma_get_object_from_value (get_prop_value);
ecma_ref_object (get_p);
prop_desc.get_p = get_p;
}
}
}
ECMA_FINALIZE (get_prop_value);
ecma_deref_ecma_string (get_magic_string_p);
}
if (!ECMA_IS_VALUE_ERROR (ret_value))
{
JERRY_ASSERT (ecma_is_value_empty (ret_value));
/* 8. */
ecma_string_t *set_magic_string_p = ecma_get_magic_string (LIT_MAGIC_STRING_SET);
ECMA_TRY_CATCH (set_prop_value,
ecma_op_object_find (obj_p, set_magic_string_p),
ret_value);
if (ecma_is_value_found (set_prop_value))
{
if (!ecma_op_is_callable (set_prop_value)
&& !ecma_is_value_undefined (set_prop_value))
{
ret_value = ecma_raise_type_error (ECMA_ERR_MSG ("Expected a function."));
}
else
{
prop_desc.is_set_defined = true;
if (ecma_is_value_undefined (set_prop_value))
{
prop_desc.set_p = NULL;
}
else
{
JERRY_ASSERT (ecma_is_value_object (set_prop_value));
ecma_object_t *set_p = ecma_get_object_from_value (set_prop_value);
ecma_ref_object (set_p);
prop_desc.set_p = set_p;
}
}
}
ECMA_FINALIZE (set_prop_value);
ecma_deref_ecma_string (set_magic_string_p);
}
if (!ECMA_IS_VALUE_ERROR (ret_value))
{
JERRY_ASSERT (ecma_is_value_empty (ret_value));
/* 9. */
if (prop_desc.is_get_defined
|| prop_desc.is_set_defined)
{
if (prop_desc.is_value_defined
|| prop_desc.is_writable_defined)
{
ret_value = ecma_raise_type_error (ECMA_ERR_MSG ("Accessors cannot be writable."));
}
}
}
if (!ECMA_IS_VALUE_ERROR (ret_value))
{
JERRY_ASSERT (ecma_is_value_empty (ret_value));
}
else
{
ecma_free_property_descriptor (&prop_desc);
}
*out_prop_desc_p = prop_desc;
}
return ret_value;
} /* ecma_op_to_property_descriptor */
/**
* @}
* @}
*/
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