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Introduce interface for removal of a ecma-collection's last value.

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JerryScript-DCO-1.0-Signed-off-by: Ruben Ayrapetyan r.ayrapetyan@samsung.com
This commit is contained in:
Ruben Ayrapetyan 2015-08-05 19:29:45 +03:00
parent ab846f6fba
commit 97aed75a46
2 changed files with 66 additions and 0 deletions
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64
jerry-core/ecma/base/ecma-helpers-values-collection.cpp
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@ -185,6 +185,70 @@ ecma_append_to_values_collection (ecma_collection_header_t *header_p, /**< colle
values_p[pos_of_new_value_in_chunk] = ecma_copy_value (v, do_ref_if_object);
} /* ecma_append_to_values_collection */
/**
* Remove last element of the collection
*
* Warning:
* the function invalidates all iterators that are configured to access the passed collection
*/
void
ecma_remove_last_value_from_values_collection (ecma_collection_header_t *header_p, /**< collection's header */
bool do_deref_if_object) /**< if the value to remove
* is object value, decrement
* reference counter of the object */
{
JERRY_ASSERT (header_p != NULL && header_p->unit_number > 0);
const size_t values_in_chunk = sizeof (ecma_collection_chunk_t::data) / sizeof (ecma_value_t);
size_t values_number = header_p->unit_number;
size_t pos_of_value_to_remove_in_chunk = (values_number - 1u) % values_in_chunk;
ecma_collection_chunk_t *last_chunk_p = ECMA_GET_NON_NULL_POINTER (ecma_collection_chunk_t,
header_p->last_chunk_cp);
ecma_value_t *values_p = (ecma_value_t *) last_chunk_p->data;
JERRY_ASSERT ((uint8_t *) (values_p + pos_of_value_to_remove_in_chunk + 1) <= (uint8_t *) (last_chunk_p + 1));
ecma_value_t value_to_remove = values_p[pos_of_value_to_remove_in_chunk];
ecma_free_value (value_to_remove, do_deref_if_object);
header_p->unit_number--;
if (pos_of_value_to_remove_in_chunk == 0)
{
ecma_collection_chunk_t *chunk_to_remove_p = last_chunk_p;
/* free last chunk */
if (header_p->first_chunk_cp == header_p->last_chunk_cp)
{
header_p->first_chunk_cp = ECMA_NULL_POINTER;
header_p->last_chunk_cp = ECMA_NULL_POINTER;
}
else
{
ecma_collection_chunk_t *chunk_iter_p = ECMA_GET_NON_NULL_POINTER (ecma_collection_chunk_t,
header_p->first_chunk_cp);
while (chunk_iter_p->next_chunk_cp != header_p->last_chunk_cp)
{
chunk_iter_p = ECMA_GET_NON_NULL_POINTER (ecma_collection_chunk_t,
chunk_iter_p->next_chunk_cp);
}
ecma_collection_chunk_t *new_last_chunk_p = chunk_iter_p;
JERRY_ASSERT (ECMA_GET_NON_NULL_POINTER (ecma_collection_chunk_t,
new_last_chunk_p->next_chunk_cp) == chunk_to_remove_p);
ECMA_SET_NON_NULL_POINTER (header_p->last_chunk_cp, new_last_chunk_p);
new_last_chunk_p->next_chunk_cp = ECMA_NULL_POINTER;
}
ecma_dealloc_collection_chunk (chunk_to_remove_p);
}
} /* ecma_remove_last_value_from_values_collection */
/**
* Allocate a collection of ecma-strings.
*

2
jerry-core/ecma/base/ecma-helpers.h
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@ -194,6 +194,8 @@ extern void ecma_free_values_collection (ecma_collection_header_t *header_p, boo
extern void ecma_append_to_values_collection (ecma_collection_header_t *header_p,
ecma_value_t v,
bool do_ref_if_object);
extern void ecma_remove_last_value_from_values_collection (ecma_collection_header_t *header_p,
bool do_deref_if_object);
extern ecma_collection_header_t *ecma_new_strings_collection (ecma_string_t *string_ptrs_buffer[],
ecma_length_t strings_number);