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Improve destructuring patterns (#4527)

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- Fix evaluation order of the operands
- Implement proper iterator closing of array destructuring
- Support next method caching

JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik frobert@inf.u-szeged.hu
This commit is contained in:
Robert Fancsik
2021-02-04 13:11:11 +01:00
committed by GitHub
parent 3bb67397a0
commit e7d11eaf9e
12 changed files with 389 additions and 354 deletions
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jerry-core/ecma/operations/ecma-iterator-object.c
+19 -87
View File
@@ -175,11 +175,8 @@ ecma_op_get_iterator (ecma_value_t value, /**< value to get iterator from */
ecma_value_t method, /**< provided method argument */
ecma_value_t *next_method_p) /**< [out] next method */
{
if (next_method_p != NULL)
{
/* TODO: NULL support should be removed after all functions support next method caching. */
*next_method_p = ECMA_VALUE_UNDEFINED;
}
JERRY_ASSERT (next_method_p != NULL);
*next_method_p = ECMA_VALUE_UNDEFINED;
/* 1. */
if (ECMA_IS_VALUE_ERROR (value))
@@ -215,7 +212,7 @@ ecma_op_get_iterator (ecma_value_t value, /**< value to get iterator from */
}
/* 3. */
if (!ecma_is_value_object (method) || !ecma_op_is_callable (method))
if (!ecma_op_is_callable (method))
{
ecma_free_value (method);
return ecma_raise_type_error (ECMA_ERR_MSG ("Iterator is not function"));
@@ -242,84 +239,28 @@ ecma_op_get_iterator (ecma_value_t value, /**< value to get iterator from */
return ecma_raise_type_error (ECMA_ERR_MSG ("Iterator is not an object"));
}
if (next_method_p != NULL)
ecma_object_t *obj_p = ecma_get_object_from_value (iterator);
ecma_value_t next_method = ecma_op_object_get_by_magic_id (obj_p, LIT_MAGIC_STRING_NEXT);
if (ECMA_IS_VALUE_ERROR (next_method))
{
ecma_object_t *obj_p = ecma_get_object_from_value (iterator);
ecma_value_t next_method = ecma_op_object_get_by_magic_id (obj_p, LIT_MAGIC_STRING_NEXT);
ecma_free_value (iterator);
return next_method;
}
if (ECMA_IS_VALUE_ERROR (next_method))
{
ecma_free_value (iterator);
return next_method;
}
if (ecma_is_value_object (next_method) && ecma_op_is_callable (next_method))
{
*next_method_p = next_method;
}
else
{
ecma_free_value (next_method);
}
if (ecma_is_value_object (next_method) && ecma_op_is_callable (next_method))
{
*next_method_p = next_method;
}
else
{
ecma_free_value (next_method);
}
/* 6. */
return iterator;
} /* ecma_op_get_iterator */
/**
* IteratorNext operation
*
* See also: ECMA-262 v6, 7.4.2
*
* Note:
* Returned value must be freed with ecma_free_value.
*
* @return iterator result object - if success
* raised error - otherwise
*/
static ecma_value_t
ecma_op_iterator_next_old (ecma_value_t iterator, /**< iterator value */
ecma_value_t value) /**< the routines's value argument */
{
JERRY_ASSERT (ecma_is_value_object (iterator));
/* 1 - 2. */
ecma_object_t *obj_p = ecma_get_object_from_value (iterator);
ecma_value_t func_next = ecma_op_object_get_by_magic_id (obj_p, LIT_MAGIC_STRING_NEXT);
if (ECMA_IS_VALUE_ERROR (func_next))
{
return func_next;
}
if (!ecma_is_value_object (func_next) || !ecma_op_is_callable (func_next))
{
ecma_free_value (func_next);
return ecma_raise_type_error (ECMA_ERR_MSG ("Iterator 'next' is not callable"));
}
ecma_object_t *next_obj_p = ecma_get_object_from_value (func_next);
bool has_value = !ecma_is_value_empty (value);
ecma_value_t result;
if (has_value)
{
result = ecma_op_function_call (next_obj_p, iterator, &value, 1);
}
else
{
result = ecma_op_function_call (next_obj_p, iterator, NULL, 0);
}
ecma_free_value (func_next);
/* 5. */
return result;
} /* ecma_op_iterator_next_old */
/**
* IteratorNext operation
*
@@ -386,7 +327,7 @@ ecma_op_iterator_return (ecma_value_t iterator, /**< iterator value */
return ecma_create_iter_result_object (value, ECMA_VALUE_TRUE);
}
if (!ecma_is_value_object (func_return) || !ecma_op_is_callable (func_return))
if (!ecma_op_is_callable (func_return))
{
ecma_free_value (func_return);
return ecma_raise_type_error (ECMA_ERR_MSG ("Iterator 'return' is not callable"));
@@ -582,16 +523,7 @@ ecma_op_iterator_step (ecma_value_t iterator, /**< iterator value */
ecma_value_t next_method) /**< next method */
{
/* 1. */
ecma_value_t result;
if (next_method == ECMA_VALUE_EMPTY)
{
/* TODO: EMPTY support should be removed after all functions support next method caching. */
result = ecma_op_iterator_next_old (iterator, ECMA_VALUE_EMPTY);
}
else
{
result = ecma_op_iterator_next (iterator, next_method, ECMA_VALUE_EMPTY);
}
ecma_value_t result = ecma_op_iterator_next (iterator, next_method, ECMA_VALUE_EMPTY);
/* 2. */
if (ECMA_IS_VALUE_ERROR (result))