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Implement for[in/of]-let construct. (#3294)

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This patch implements let/const support for all "for" statements.
It includes an algorithm for cloning declarative lexical environments.

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com
This commit is contained in:
Zoltan Herczeg
2019-11-11 13:53:32 +01:00
committed by Dániel Bátyai
parent 58f71e6ffa
commit da69589f05
8 changed files with 503 additions and 110 deletions
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jerry-core/ecma/base/ecma-helpers.c
+70
View File
@@ -319,6 +319,76 @@ ecma_get_lex_env_binding_object (const ecma_object_t *object_p) /**< object-boun
return ECMA_GET_NON_NULL_POINTER (ecma_object_t, object_p->u1.bound_object_cp);
} /* ecma_get_lex_env_binding_object */
/**
* Create a new lexical environment with the same property list as the passed lexical environment
*
* @return pointer to the newly created lexical environment
*/
ecma_object_t *
ecma_clone_decl_lexical_environment (ecma_object_t *lex_env_p, /**< declarative lexical environment */
bool copy_values) /**< copy property values as well */
{
JERRY_ASSERT (ecma_get_lex_env_type (lex_env_p) == ECMA_LEXICAL_ENVIRONMENT_DECLARATIVE);
JERRY_ASSERT (lex_env_p->u2.outer_reference_cp != JMEM_CP_NULL);
ecma_object_t *outer_lex_env_p = ECMA_GET_NON_NULL_POINTER (ecma_object_t, lex_env_p->u2.outer_reference_cp);
ecma_object_t *new_lex_env_p = ecma_create_decl_lex_env (outer_lex_env_p);
jmem_cpointer_t prop_iter_cp = lex_env_p->u1.property_list_cp;
JERRY_ASSERT (prop_iter_cp != JMEM_CP_NULL);
ecma_property_header_t *prop_iter_p = ECMA_GET_NON_NULL_POINTER (ecma_property_header_t,
prop_iter_cp);
if (prop_iter_p->types[0] == ECMA_PROPERTY_TYPE_HASHMAP)
{
prop_iter_cp = prop_iter_p->next_property_cp;
}
JERRY_ASSERT (prop_iter_cp != JMEM_CP_NULL);
do
{
prop_iter_p = ECMA_GET_NON_NULL_POINTER (ecma_property_header_t, prop_iter_cp);
JERRY_ASSERT (ECMA_PROPERTY_IS_PROPERTY_PAIR (prop_iter_p));
ecma_property_pair_t *prop_pair_p = (ecma_property_pair_t *) prop_iter_p;
for (int i = 0; i < ECMA_PROPERTY_PAIR_ITEM_COUNT; i++)
{
if (prop_iter_p->types[i] != ECMA_PROPERTY_TYPE_DELETED)
{
JERRY_ASSERT (ECMA_PROPERTY_GET_TYPE (prop_iter_p->types[i]) == ECMA_PROPERTY_TYPE_NAMEDDATA);
uint8_t prop_attributes = (uint8_t) (prop_iter_p->types[i] & ECMA_PROPERTY_CONFIGURABLE_ENUMERABLE_WRITABLE);
ecma_string_t *name_p = ecma_string_from_property_name (prop_iter_p->types[i], prop_pair_p->names_cp[i]);
ecma_property_value_t *property_value_p;
property_value_p = ecma_create_named_data_property (new_lex_env_p, name_p, prop_attributes, NULL);
ecma_deref_ecma_string (name_p);
JERRY_ASSERT (property_value_p->value == ECMA_VALUE_UNDEFINED);
if (copy_values)
{
property_value_p->value = ecma_copy_value_if_not_object (prop_pair_p->values[i].value);
}
else
{
property_value_p->value = ECMA_VALUE_UNINITIALIZED;
}
}
}
prop_iter_cp = prop_iter_p->next_property_cp;
}
while (prop_iter_cp != JMEM_CP_NULL);
ecma_deref_object (lex_env_p);
return new_lex_env_p;
} /* ecma_clone_decl_lexical_environment */
/**
* Create a property in an object and link it into
* the object's properties' linked-list (at start of the list).
jerry-core/ecma/base/ecma-helpers.h
+1
View File
@@ -371,6 +371,7 @@ uint8_t ecma_get_object_builtin_id (ecma_object_t *object_p);
ecma_lexical_environment_type_t JERRY_ATTR_PURE ecma_get_lex_env_type (const ecma_object_t *object_p);
ecma_object_t JERRY_ATTR_PURE *ecma_get_lex_env_outer_reference (const ecma_object_t *object_p);
ecma_object_t JERRY_ATTR_PURE *ecma_get_lex_env_binding_object (const ecma_object_t *object_p);
ecma_object_t *ecma_clone_decl_lexical_environment (ecma_object_t *lex_env_p, bool copy_values);
ecma_property_value_t *
ecma_create_named_data_property (ecma_object_t *object_p, ecma_string_t *name_p, uint8_t prop_attributes,