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Remove string copy

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Changed 'ecma_copy_or_ref_ecma_string' to 'ecma_ref_ecma_string'. It does
not copy the string if the maximum number of reference counter is reached,
but bails out with an error like the 'ecma_ref_object' function does.

JerryScript-DCO-1.0-Signed-off-by: László Langó llango.u-szeged@partner.samsung.com
This commit is contained in:
László Langó
2016-06-14 13:51:44 +02:00
parent 7a3ed2650d
commit 0daeb2f942
18 changed files with 36 additions and 117 deletions
Download Patch File Download Diff File Expand all files Collapse all files
jerry-core/ecma/base/ecma-helpers-string.c
+11 -92
View File
@@ -384,11 +384,11 @@ ecma_concat_ecma_strings (ecma_string_t *string1_p, /**< first ecma-string */
if (str1_size == 0)
{
return ecma_copy_or_ref_ecma_string (string2_p);
return ecma_ref_ecma_string (string2_p);
}
else if (str2_size == 0)
{
return ecma_copy_or_ref_ecma_string (string1_p);
return ecma_ref_ecma_string (string1_p);
}
const lit_utf8_size_t new_size = str1_size + str2_size;
@@ -442,83 +442,6 @@ ecma_concat_ecma_strings (ecma_string_t *string1_p, /**< first ecma-string */
return string_desc_p;
} /* ecma_concat_ecma_strings */
/**
* Copy ecma-string
*
* @return pointer to copy of ecma-string with reference counter set to 1
*/
static ecma_string_t *
ecma_copy_ecma_string (ecma_string_t *string_desc_p) /**< string descriptor */
{
JERRY_ASSERT (string_desc_p != NULL);
JERRY_ASSERT (string_desc_p->refs_and_container >= ECMA_STRING_REF_ONE);
ecma_string_t *new_str_p;
switch (ECMA_STRING_GET_CONTAINER (string_desc_p))
{
case ECMA_STRING_CONTAINER_LIT_TABLE:
case ECMA_STRING_CONTAINER_UINT32_IN_DESC:
case ECMA_STRING_CONTAINER_MAGIC_STRING:
case ECMA_STRING_CONTAINER_MAGIC_STRING_EX:
{
new_str_p = ecma_alloc_string ();
*new_str_p = *string_desc_p;
new_str_p->refs_and_container = ECMA_STRING_SET_REF_TO_ONE (new_str_p->refs_and_container);
break;
}
case ECMA_STRING_CONTAINER_HEAP_UTF8_STRING:
{
new_str_p = ecma_alloc_string ();
*new_str_p = *string_desc_p;
new_str_p->refs_and_container = ECMA_STRING_SET_REF_TO_ONE (new_str_p->refs_and_container);
const ecma_string_heap_header_t *data_p = ECMA_GET_NON_NULL_POINTER (ecma_string_heap_header_t,
string_desc_p->u.utf8_collection_cp);
JERRY_ASSERT (data_p != NULL);
const size_t data_size = data_p->size + sizeof (ecma_string_heap_header_t);
ecma_string_heap_header_t *new_data_p = (ecma_string_heap_header_t *) jmem_heap_alloc_block (data_size);
memcpy (new_data_p, data_p, data_size);
ECMA_SET_NON_NULL_POINTER (new_str_p->u.utf8_collection_cp, new_data_p);
break;
}
case ECMA_STRING_CONTAINER_HEAP_ASCII_STRING:
{
new_str_p = ecma_alloc_string ();
*new_str_p = *string_desc_p;
new_str_p->refs_and_container = ECMA_STRING_SET_REF_TO_ONE (new_str_p->refs_and_container);
const lit_utf8_byte_t *data_p = ECMA_GET_NON_NULL_POINTER (lit_utf8_byte_t,
string_desc_p->u.ascii_string.ascii_collection_cp);
JERRY_ASSERT (data_p != NULL);
const size_t data_size = string_desc_p->u.ascii_string.size;
lit_utf8_byte_t *new_data_p = (lit_utf8_byte_t *) jmem_heap_alloc_block (data_size);
memcpy (new_data_p, data_p, data_size);
ECMA_SET_NON_NULL_POINTER (new_str_p->u.ascii_string.ascii_collection_cp, new_data_p);
break;
}
default:
{
JERRY_UNREACHABLE ();
}
}
JERRY_ASSERT (ecma_compare_ecma_strings (string_desc_p, new_str_p));
return new_str_p;
} /* ecma_copy_ecma_string */
/**
* Increase reference counter of ecma-string.
*
@@ -526,27 +449,23 @@ ecma_copy_ecma_string (ecma_string_t *string_desc_p) /**< string descriptor */
* or the ecma-string's copy with reference counter set to 1
*/
ecma_string_t *
ecma_copy_or_ref_ecma_string (ecma_string_t *string_p) /**< string descriptor */
ecma_ref_ecma_string (ecma_string_t *string_p) /**< string descriptor */
{
JERRY_ASSERT (string_p != NULL);
JERRY_ASSERT (string_p->refs_and_container >= ECMA_STRING_REF_ONE);
if (unlikely (string_p->refs_and_container >= ECMA_STRING_MAX_REF))
if (likely (string_p->refs_and_container < ECMA_STRING_MAX_REF))
{
/* First trying to free unreachable objects that maybe refer to the string */
ecma_gc_run ();
if (string_p->refs_and_container >= ECMA_STRING_MAX_REF)
{
/* reference counter was not changed during GC, copying string */
return ecma_copy_ecma_string (string_p);
}
/* Increase reference counter. */
string_p->refs_and_container = (uint16_t) (string_p->refs_and_container + ECMA_STRING_REF_ONE);
}
else
{
jerry_fatal (ERR_REF_COUNT_LIMIT);
}
/* Increase reference counter. */
string_p->refs_and_container = (uint16_t) (string_p->refs_and_container + ECMA_STRING_REF_ONE);
return string_p;
} /* ecma_copy_or_ref_ecma_string */
} /* ecma_ref_ecma_string */
/**
* Decrease reference counter and deallocate ecma-string