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jerryscript/jerry-core/ecma/operations/ecma-lex-env.c
T
Akos Kiss 27682017e9 Remove unused internal functions 
The internals have surprisingly large number of unused functions at
surprising places. This patch cleans them out to make maintenance
easier and to prevent dead code having effect on future decisions.

The patch intentionally does not try to clean up public API but
focuses on internal modules only that are/should not be reachable
from "outside".

However, unit tests do access private API, thus tests of literal
storage had to be adjusted.

JerryScript-DCO-1.0-Signed-off-by: Akos Kiss akiss@inf.u-szeged.hu
2016-04-22 14:39:43 +02:00

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/* Copyright 2014-2016 Samsung Electronics Co., Ltd.
* Copyright 2016 University of Szeged.
*
* 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-builtin-helpers.h"
#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 */
/**
* @}
*/
/**
* 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_OBJECT_BOUND
|| ecma_get_lex_env_type (lex_env_p) == ECMA_LEXICAL_ENVIRONMENT_THIS_OBJECT_BOUND);
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 ecma value
* Returned value must be freed with ecma_free_value
*/
ecma_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_OBJECT_BOUND
|| ecma_get_lex_env_type (lex_env_p) == ECMA_LEXICAL_ENVIRONMENT_THIS_OBJECT_BOUND);
ecma_object_t *binding_obj_p = ecma_get_lex_env_binding_object (lex_env_p);
ecma_value_t completion;
completion = ecma_builtin_helper_def_prop (binding_obj_p,
name_p,
ecma_make_simple_value (ECMA_SIMPLE_VALUE_UNDEFINED),
true, /* Writable */
true, /* Enumerable */
is_deletable, /* Configurable */
true); /* Failure handling */
if (ecma_is_value_error (completion))
{
return completion;
}
else
{
JERRY_ASSERT (ecma_is_value_boolean (completion));
}
}
return ecma_make_simple_value (ECMA_SIMPLE_VALUE_EMPTY);
} /* ecma_op_create_mutable_binding */
/**
* SetMutableBinding operation.
*
* See also: ECMA-262 v5, 10.2.1
*
* @return ecma value
* Returned value must be freed with ecma_free_value.
*/
ecma_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)
{
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_raise_type_error (ECMA_ERR_MSG (""));
}
}
else
{
JERRY_ASSERT (ecma_get_lex_env_type (lex_env_p) == ECMA_LEXICAL_ENVIRONMENT_OBJECT_BOUND
|| ecma_get_lex_env_type (lex_env_p) == ECMA_LEXICAL_ENVIRONMENT_THIS_OBJECT_BOUND);
ecma_object_t *binding_obj_p = ecma_get_lex_env_binding_object (lex_env_p);
ecma_value_t completion = ecma_op_object_put (binding_obj_p,
name_p,
value,
is_strict);
if (ecma_is_value_error (completion))
{
return completion;
}
else
{
JERRY_ASSERT (ecma_is_value_boolean (completion));
}
}
return ecma_make_simple_value (ECMA_SIMPLE_VALUE_EMPTY);
} /* ecma_op_set_mutable_binding */
/**
* GetBindingValue operation.
*
* See also: ECMA-262 v5, 10.2.1
*
* @return ecma value
* Returned value must be freed with ecma_free_value.
*/
ecma_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)
{
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_raise_reference_error (ECMA_ERR_MSG (""));
}
else
{
return ecma_make_simple_value (ECMA_SIMPLE_VALUE_UNDEFINED);
}
}
return ecma_copy_value (prop_value);
}
else
{
JERRY_ASSERT (ecma_get_lex_env_type (lex_env_p) == ECMA_LEXICAL_ENVIRONMENT_OBJECT_BOUND
|| ecma_get_lex_env_type (lex_env_p) == ECMA_LEXICAL_ENVIRONMENT_THIS_OBJECT_BOUND);
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_raise_reference_error (ECMA_ERR_MSG (""));
}
else
{
return ecma_make_simple_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 ecma value
* Return value is simple and so need not be freed.
* However, ecma_free_value may be called for it, but it is a no-op.
*/
ecma_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 (ECMA_PROPERTY_GET_TYPE (prop_p) == ECMA_PROPERTY_TYPE_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_value (ret_val);
}
else
{
JERRY_ASSERT (ecma_get_lex_env_type (lex_env_p) == ECMA_LEXICAL_ENVIRONMENT_OBJECT_BOUND
|| ecma_get_lex_env_type (lex_env_p) == ECMA_LEXICAL_ENVIRONMENT_THIS_OBJECT_BOUND);
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 ecma value
* Returned value must be freed with ecma_free_value.
*/
ecma_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_value (ECMA_SIMPLE_VALUE_UNDEFINED);
}
else
{
JERRY_ASSERT (ecma_get_lex_env_type (lex_env_p) == ECMA_LEXICAL_ENVIRONMENT_OBJECT_BOUND
|| ecma_get_lex_env_type (lex_env_p) == ECMA_LEXICAL_ENVIRONMENT_THIS_OBJECT_BOUND);
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_object_value (binding_obj_p);
}
else
{
return ecma_make_simple_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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