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Add ArrayBuffer with user specified buffer

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New API functions:
 - jerry_create_arraybuffer_external
 - jerry_get_arraybuffer_pointer

JerryScript-DCO-1.0-Signed-off-by: Peter Gal pgal.u-szeged@partner.samsung.com
This commit is contained in:
Peter Gal
2018-01-08 15:35:18 +01:00
committed by yichoi
parent 7acd688513
commit 4b699e997a
8 changed files with 416 additions and 5 deletions
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jerry-core/ecma/operations/ecma-arraybuffer-object.c
+43 -1
View File
@@ -51,6 +51,7 @@ ecma_arraybuffer_new_object (ecma_length_t length) /**< length of the arraybuffe
ECMA_OBJECT_TYPE_CLASS);
ecma_deref_object (prototype_obj_p);
ecma_extended_object_t *ext_object_p = (ecma_extended_object_t *) object_p;
ext_object_p->u.class_prop.extra_info = ECMA_ARRAYBUFFER_INTERNAL_MEMORY;
ext_object_p->u.class_prop.class_id = LIT_MAGIC_STRING_ARRAY_BUFFER_UL;
ext_object_p->u.class_prop.u.length = length;
@@ -60,6 +61,38 @@ ecma_arraybuffer_new_object (ecma_length_t length) /**< length of the arraybuffe
return object_p;
} /* ecma_arraybuffer_new_object */
/**
* Helper function: create arraybuffer object with external buffer backing.
*
* The struct of external arraybuffer object:
* ecma_object_t
* extend_part
* arraybuffer external info part
*
* @return ecma_object_t *, pointer to the created ArrayBuffer object
*/
ecma_object_t *
ecma_arraybuffer_new_object_external (ecma_length_t length, /**< length of the buffer_p to use */
void *buffer_p, /**< pointer for ArrayBuffer's buffer backing */
ecma_object_native_free_callback_t free_cb) /**< buffer free callback */
{
ecma_object_t *prototype_obj_p = ecma_builtin_get (ECMA_BUILTIN_ID_ARRAYBUFFER_PROTOTYPE);
ecma_object_t *object_p = ecma_create_object (prototype_obj_p,
sizeof (ecma_arraybuffer_external_info),
ECMA_OBJECT_TYPE_CLASS);
ecma_deref_object (prototype_obj_p);
ecma_arraybuffer_external_info *array_object_p = (ecma_arraybuffer_external_info *) object_p;
array_object_p->extended_object.u.class_prop.extra_info = ECMA_ARRAYBUFFER_EXTERNAL_MEMORY;
array_object_p->extended_object.u.class_prop.class_id = LIT_MAGIC_STRING_ARRAY_BUFFER_UL;
array_object_p->extended_object.u.class_prop.u.length = length;
array_object_p->buffer_p = buffer_p;
array_object_p->free_cb = free_cb;
return object_p;
} /* ecma_arraybuffer_new_object_external */
/**
* ArrayBuffer object creation operation.
*
@@ -158,7 +191,16 @@ ecma_arraybuffer_get_buffer (ecma_object_t *object_p) /**< pointer to the ArrayB
JERRY_ASSERT (ecma_object_class_is (object_p, LIT_MAGIC_STRING_ARRAY_BUFFER_UL));
ecma_extended_object_t *ext_object_p = (ecma_extended_object_t *) object_p;
return (lit_utf8_byte_t *) (ext_object_p + 1);
if (ECMA_ARRAYBUFFER_HAS_EXTERNAL_MEMORY (ext_object_p))
{
ecma_arraybuffer_external_info *array_p = (ecma_arraybuffer_external_info *) ext_object_p;
return (lit_utf8_byte_t *) array_p->buffer_p;
}
else
{
return (lit_utf8_byte_t *) (ext_object_p + 1);
}
} /* ecma_arraybuffer_get_buffer */
/**