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jerryscript/jerry-core/ecma/operations/ecma-lex-env.cpp
Andrey Shitov 9763a93df3 Add new coding style rules and fix appeared issues. 
JerryScript-DCO-1.0-Signed-off-by: Andrey Shitov a.shitov@samsung.com
2015-05-14 14:44:57 +03:00

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/* Copyright 2014-2015 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-builtins.h"
#include "ecma-exceptions.h"
#include "ecma-gc.h"
#include "ecma-globals.h"
#include "ecma-helpers.h"
#include "ecma-lex-env.h"
#include "ecma-objects.h"
#include "jrt.h"
/** \addtogroup ecma ECMA
* @{
*/
/**
* \addtogroup lexicalenvironment Lexical environment
* @{
*/
/**
* \addtogroup globallexicalenvironment Global lexical environment
* @{
*/
/**
* Global lexical environment
*
* See also: ECMA-262 v5, 10.2.3
*/
ecma_object_t* ecma_global_lex_env_p = NULL;
/**
* Initialize Global environment
*/
void
ecma_init_environment (void)
{
#ifdef CONFIG_ECMA_GLOBAL_ENVIRONMENT_DECLARATIVE
ecma_global_lex_env_p = ecma_create_decl_lex_env (NULL);
#else /* !CONFIG_ECMA_GLOBAL_ENVIRONMENT_DECLARATIVE */
ecma_object_t *glob_obj_p = ecma_builtin_get (ECMA_BUILTIN_ID_GLOBAL);
ecma_global_lex_env_p = ecma_create_object_lex_env (NULL, glob_obj_p, false);
ecma_deref_object (glob_obj_p);
#endif /* !CONFIG_ECMA_GLOBAL_ENVIRONMENT_DECLARATIVE */
} /* ecma_init_environment */
/**
* Finalize Global environment
*/
void
ecma_finalize_environment (void)
{
ecma_deref_object (ecma_global_lex_env_p);
ecma_global_lex_env_p = NULL;
} /* ecma_finalize_environment */
/**
* Get reference to Global lexical environment
*
* @return pointer to the object's instance
*/
ecma_object_t*
ecma_get_global_environment (void)
{
ecma_ref_object (ecma_global_lex_env_p);
return ecma_global_lex_env_p;
} /* ecma_get_global_environment */
/**
* Figure out whether the lexical environment is global.
*
* @return true - if lexical environment is object-bound and corresponding object is global object,
* false - otherwise.
*/
bool
ecma_is_lexical_environment_global (ecma_object_t *lex_env_p) /**< lexical environment */
{
JERRY_ASSERT (lex_env_p != NULL
&& ecma_is_lexical_environment (lex_env_p));
return (lex_env_p == ecma_global_lex_env_p);
} /* ecma_is_lexical_environment_global */
/**
* @}
*/
/**
* HasBinding operation.
*
* See also: ECMA-262 v5, 10.2.1
*
* @return true / false
*/
bool
ecma_op_has_binding (ecma_object_t *lex_env_p, /**< lexical environment */
ecma_string_t *name_p) /**< argument N */
{
JERRY_ASSERT (lex_env_p != NULL
&& ecma_is_lexical_environment (lex_env_p));
if (ecma_get_lex_env_type (lex_env_p) == ECMA_LEXICAL_ENVIRONMENT_DECLARATIVE)
{
ecma_property_t *property_p = ecma_find_named_property (lex_env_p, name_p);
return (property_p != NULL);
}
else
{
JERRY_ASSERT (ecma_get_lex_env_type (lex_env_p) == ECMA_LEXICAL_ENVIRONMENT_OBJECTBOUND);
ecma_object_t *binding_obj_p = ecma_get_lex_env_binding_object (lex_env_p);
return (ecma_op_object_get_property (binding_obj_p, name_p) != NULL);
}
} /* ecma_op_has_binding */
/**
* CreateMutableBinding operation.
*
* See also: ECMA-262 v5, 10.2.1
*
* @return completion value
* Returned value must be freed with ecma_free_completion_value
*/
ecma_completion_value_t
ecma_op_create_mutable_binding (ecma_object_t *lex_env_p, /**< lexical environment */
ecma_string_t *name_p, /**< argument N */
bool is_deletable) /**< argument D */
{
JERRY_ASSERT (lex_env_p != NULL
&& ecma_is_lexical_environment (lex_env_p));
JERRY_ASSERT (name_p != NULL);
if (ecma_get_lex_env_type (lex_env_p) == ECMA_LEXICAL_ENVIRONMENT_DECLARATIVE)
{
ecma_create_named_data_property (lex_env_p,
name_p,
true, false, is_deletable);
}
else
{
JERRY_ASSERT (ecma_get_lex_env_type (lex_env_p) == ECMA_LEXICAL_ENVIRONMENT_OBJECTBOUND);
ecma_object_t *binding_obj_p = ecma_get_lex_env_binding_object (lex_env_p);
ecma_property_descriptor_t prop_desc = ecma_make_empty_property_descriptor ();
{
prop_desc.is_value_defined = true;
prop_desc.value = ecma_make_simple_value (ECMA_SIMPLE_VALUE_UNDEFINED);
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 = is_deletable;
}
ecma_completion_value_t completion = ecma_op_object_define_own_property (binding_obj_p,
name_p,
&prop_desc,
true);
if (ecma_is_completion_value_throw (completion))
{
return completion;
}
else
{
JERRY_ASSERT (ecma_is_completion_value_normal_true (completion)
|| ecma_is_completion_value_normal_false (completion));
}
}
return ecma_make_empty_completion_value ();
} /* ecma_op_create_mutable_binding */
/**
* SetMutableBinding operation.
*
* See also: ECMA-262 v5, 10.2.1
*
* @return completion value
* Returned value must be freed with ecma_free_completion_value.
*/
ecma_completion_value_t
ecma_op_set_mutable_binding (ecma_object_t *lex_env_p, /**< lexical environment */
ecma_string_t *name_p, /**< argument N */
ecma_value_t value, /**< argument V */
bool is_strict) /**< argument S */
{
JERRY_ASSERT (lex_env_p != NULL
&& ecma_is_lexical_environment (lex_env_p));
JERRY_ASSERT (name_p != NULL);
if (ecma_get_lex_env_type (lex_env_p) == ECMA_LEXICAL_ENVIRONMENT_DECLARATIVE)
{
#ifndef JERRY_NDEBUG
# ifdef CONFIG_ECMA_COMPACT_PROFILE
bool is_equal = false;
ecma_string_t *arguments_magic_string_p = ecma_get_magic_string (ECMA_MAGIC_STRING_ARGUMENTS);
if (ecma_compare_ecma_strings (name_p, arguments_magic_string_p))
{
is_equal = true;
}
ecma_deref_ecma_string (arguments_magic_string_p);
JERRY_ASSERT (!is_equal);
if (is_equal)
{
return ecma_make_throw_obj_completion_value (ecma_builtin_get (ECMA_BUILTIN_ID_COMPACT_PROFILE_ERROR));
}
# endif /* CONFIG_ECMA_COMPACT_PROFILE */
#endif /* !JERRY_NDEBUG */
ecma_property_t *property_p = ecma_get_named_data_property (lex_env_p, name_p);
if (ecma_is_property_writable (property_p))
{
ecma_named_data_property_assign_value (lex_env_p, property_p, value);
}
else if (is_strict)
{
return ecma_make_throw_obj_completion_value (ecma_new_standard_error (ECMA_ERROR_TYPE));
}
}
else
{
JERRY_ASSERT (ecma_get_lex_env_type (lex_env_p) == ECMA_LEXICAL_ENVIRONMENT_OBJECTBOUND);
ecma_object_t *binding_obj_p = ecma_get_lex_env_binding_object (lex_env_p);
ecma_completion_value_t completion = ecma_op_object_put (binding_obj_p,
name_p,
value,
is_strict);
if (ecma_is_completion_value_throw (completion))
{
return completion;
}
else
{
JERRY_ASSERT (ecma_is_completion_value_normal_true (completion)
|| ecma_is_completion_value_normal_false (completion));
}
}
return ecma_make_empty_completion_value ();
} /* ecma_op_set_mutable_binding */
/**
* GetBindingValue operation.
*
* See also: ECMA-262 v5, 10.2.1
*
* @return completion value
* Returned value must be freed with ecma_free_completion_value.
*/
ecma_completion_value_t
ecma_op_get_binding_value (ecma_object_t *lex_env_p, /**< lexical environment */
ecma_string_t *name_p, /**< argument N */
bool is_strict) /**< argument S */
{
JERRY_ASSERT (lex_env_p != NULL
&& ecma_is_lexical_environment (lex_env_p));
JERRY_ASSERT (name_p != NULL);
if (ecma_get_lex_env_type (lex_env_p) == ECMA_LEXICAL_ENVIRONMENT_DECLARATIVE)
{
#ifndef JERRY_NDEBUG
# ifdef CONFIG_ECMA_COMPACT_PROFILE
bool is_equal = false;
ecma_string_t *arguments_magic_string_p = ecma_get_magic_string (ECMA_MAGIC_STRING_ARGUMENTS);
if (ecma_compare_ecma_strings (name_p, arguments_magic_string_p))
{
is_equal = true;
}
ecma_deref_ecma_string (arguments_magic_string_p);
JERRY_ASSERT (!is_equal);
if (is_equal)
{
return ecma_make_throw_obj_completion_value (ecma_builtin_get (ECMA_BUILTIN_ID_COMPACT_PROFILE_ERROR));
}
# endif /* CONFIG_ECMA_COMPACT_PROFILE */
#endif /* !JERRY_NDEBUG */
ecma_property_t *property_p = ecma_get_named_data_property (lex_env_p, name_p);
ecma_value_t prop_value = ecma_get_named_data_property_value (property_p);
/* is the binding mutable? */
if (!ecma_is_property_writable (property_p)
&& ecma_is_value_empty (prop_value))
{
/* unitialized immutable binding */
if (is_strict)
{
return ecma_make_throw_obj_completion_value (ecma_new_standard_error (ECMA_ERROR_REFERENCE));
}
else
{
return ecma_make_simple_completion_value (ECMA_SIMPLE_VALUE_UNDEFINED);
}
}
return ecma_make_normal_completion_value (ecma_copy_value (prop_value, true));
}
else
{
JERRY_ASSERT (ecma_get_lex_env_type (lex_env_p) == ECMA_LEXICAL_ENVIRONMENT_OBJECTBOUND);
ecma_object_t *binding_obj_p = ecma_get_lex_env_binding_object (lex_env_p);
if (ecma_op_object_get_property (binding_obj_p, name_p) == NULL)
{
if (is_strict)
{
return ecma_make_throw_obj_completion_value (ecma_new_standard_error (ECMA_ERROR_REFERENCE));
}
else
{
return ecma_make_simple_completion_value (ECMA_SIMPLE_VALUE_UNDEFINED);
}
}
return ecma_op_object_get (binding_obj_p, name_p);
}
} /* ecma_op_get_binding_value */
/**
* DeleteBinding operation.
*
* See also: ECMA-262 v5, 10.2.1
*
* @return completion value
* Return value is simple and so need not be freed.
* However, ecma_free_completion_value may be called for it, but it is a no-op.
*/
ecma_completion_value_t
ecma_op_delete_binding (ecma_object_t *lex_env_p, /**< lexical environment */
ecma_string_t *name_p) /**< argument N */
{
JERRY_ASSERT (lex_env_p != NULL
&& ecma_is_lexical_environment (lex_env_p));
JERRY_ASSERT (name_p != NULL);
if (ecma_get_lex_env_type (lex_env_p) == ECMA_LEXICAL_ENVIRONMENT_DECLARATIVE)
{
ecma_property_t *prop_p = ecma_find_named_property (lex_env_p, name_p);
ecma_simple_value_t ret_val;
if (prop_p == NULL)
{
ret_val = ECMA_SIMPLE_VALUE_TRUE;
}
else
{
JERRY_ASSERT (prop_p->type == ECMA_PROPERTY_NAMEDDATA);
if (!ecma_is_property_configurable (prop_p))
{
ret_val = ECMA_SIMPLE_VALUE_FALSE;
}
else
{
ecma_delete_property (lex_env_p, prop_p);
ret_val = ECMA_SIMPLE_VALUE_TRUE;
}
}
return ecma_make_simple_completion_value (ret_val);
}
else
{
JERRY_ASSERT (ecma_get_lex_env_type (lex_env_p) == ECMA_LEXICAL_ENVIRONMENT_OBJECTBOUND);
ecma_object_t *binding_obj_p = ecma_get_lex_env_binding_object (lex_env_p);
return ecma_op_object_delete (binding_obj_p, name_p, false);
}
} /* ecma_op_delete_binding */
/**
* ImplicitThisValue operation.
*
* See also: ECMA-262 v5, 10.2.1
*
* @return completion value
* Returned value must be freed with ecma_free_completion_value.
*/
ecma_completion_value_t
ecma_op_implicit_this_value (ecma_object_t *lex_env_p) /**< lexical environment */
{
JERRY_ASSERT (lex_env_p != NULL
&& ecma_is_lexical_environment (lex_env_p));
if (ecma_get_lex_env_type (lex_env_p) == ECMA_LEXICAL_ENVIRONMENT_DECLARATIVE)
{
return ecma_make_simple_completion_value (ECMA_SIMPLE_VALUE_UNDEFINED);
}
else
{
JERRY_ASSERT (ecma_get_lex_env_type (lex_env_p) == ECMA_LEXICAL_ENVIRONMENT_OBJECTBOUND);
if (ecma_get_lex_env_provide_this (lex_env_p))
{
ecma_object_t *binding_obj_p = ecma_get_lex_env_binding_object (lex_env_p);
ecma_ref_object (binding_obj_p);
return ecma_make_normal_completion_value (ecma_make_object_value (binding_obj_p));
}
else
{
return ecma_make_simple_completion_value (ECMA_SIMPLE_VALUE_UNDEFINED);
}
}
} /* ecma_op_implicit_this_value */
/**
* CreateImmutableBinding operation.
*
* See also: ECMA-262 v5, 10.2.1
*/
void
ecma_op_create_immutable_binding (ecma_object_t *lex_env_p, /**< lexical environment */
ecma_string_t *name_p) /**< argument N */
{
JERRY_ASSERT (lex_env_p != NULL
&& ecma_is_lexical_environment (lex_env_p));
JERRY_ASSERT (ecma_get_lex_env_type (lex_env_p) == ECMA_LEXICAL_ENVIRONMENT_DECLARATIVE);
/*
* Warning:
* Whether immutable bindings are deletable seems not to be defined by ECMA v5.
*/
ecma_property_t *prop_p = ecma_create_named_data_property (lex_env_p,
name_p,
false, false, false);
JERRY_ASSERT (ecma_is_value_undefined (ecma_get_named_data_property_value (prop_p)));
ecma_set_named_data_property_value (prop_p,
ecma_make_simple_value (ECMA_SIMPLE_VALUE_EMPTY));
} /* ecma_op_create_immutable_binding */
/**
* InitializeImmutableBinding operation.
*
* See also: ECMA-262 v5, 10.2.1
*/
void
ecma_op_initialize_immutable_binding (ecma_object_t *lex_env_p, /**< lexical environment */
ecma_string_t *name_p, /**< argument N */
ecma_value_t value) /**< argument V */
{
JERRY_ASSERT (lex_env_p != NULL
&& ecma_is_lexical_environment (lex_env_p));
JERRY_ASSERT (ecma_get_lex_env_type (lex_env_p) == ECMA_LEXICAL_ENVIRONMENT_DECLARATIVE);
ecma_property_t *prop_p = ecma_get_named_data_property (lex_env_p, name_p);
/* The binding must be unitialized immutable binding */
JERRY_ASSERT (!ecma_is_property_writable (prop_p)
&& ecma_is_value_empty (ecma_get_named_data_property_value (prop_p)));
ecma_named_data_property_assign_value (lex_env_p, prop_p, value);
} /* ecma_op_initialize_immutable_binding */
/**
* @}
* @}
*/
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