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Implementing routine for copying ecma-string and using it to duplicate ecma-string upon it's reference counter overflow.

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This commit is contained in:
Ruben Ayrapetyan 2014-10-28 14:52:40 +03:00
parent 4735570b31
commit 459750b1d0
1 changed files with 108 additions and 14 deletions
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122
src/libecmaobjects/ecma-helpers-string.c
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@ -22,6 +22,7 @@
#include "deserializer.h"
#include "ecma-alloc.h"
#include "ecma-gc.h"
#include "ecma-globals.h"
#include "ecma-helpers.h"
#include "globals.h"
@ -274,6 +275,100 @@ 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 > 0);
ecma_string_t *new_str_p;
switch ((ecma_string_container_t) string_desc_p->container)
{
case ECMA_STRING_CONTAINER_CHARS_IN_DESC:
case ECMA_STRING_CONTAINER_LIT_TABLE:
case ECMA_STRING_CONTAINER_UINT32_IN_DESC:
case ECMA_STRING_CONTAINER_MAGIC_STRING:
{
new_str_p = ecma_alloc_string ();
*new_str_p = *string_desc_p;
new_str_p->refs = 1;
break;
}
case ECMA_STRING_CONTAINER_CONCATENATION:
{
ecma_string_t *part1_p = ECMA_GET_POINTER (string_desc_p->u.concatenation.string1_cp);
ecma_string_t *part2_p = ECMA_GET_POINTER (string_desc_p->u.concatenation.string2_cp);
new_str_p = ecma_concat_ecma_strings (part1_p, part2_p);
break;
}
case ECMA_STRING_CONTAINER_HEAP_NUMBER:
{
ecma_number_t *num_p = ECMA_GET_POINTER (string_desc_p->u.number_cp);
new_str_p = ecma_new_ecma_string_from_number (*num_p);
break;
}
case ECMA_STRING_CONTAINER_HEAP_CHUNKS:
{
ecma_collection_chunk_t *str_heap_chunk_p = ECMA_GET_POINTER (string_desc_p->u.chunk_cp);
JERRY_ASSERT (str_heap_chunk_p != NULL);
new_str_p = ecma_alloc_string ();
*new_str_p = *string_desc_p;
ecma_collection_chunk_t *new_str_heap_chunk_p = ecma_alloc_collection_chunk ();
ECMA_SET_NON_NULL_POINTER (new_str_p->u.chunk_cp, new_str_heap_chunk_p);
while (true)
{
__memcpy (new_str_heap_chunk_p->data, str_heap_chunk_p->data, sizeof (new_str_heap_chunk_p->data));
str_heap_chunk_p = ECMA_GET_POINTER (str_heap_chunk_p->next_chunk_cp);
if (str_heap_chunk_p != NULL)
{
ecma_collection_chunk_t *new_str_next_heap_chunk_p = ecma_alloc_collection_chunk ();
ECMA_SET_NON_NULL_POINTER (new_str_heap_chunk_p->next_chunk_cp, new_str_next_heap_chunk_p);
new_str_heap_chunk_p = new_str_next_heap_chunk_p;
}
else
{
break;
}
}
new_str_heap_chunk_p->next_chunk_cp = ECMA_NULL_POINTER;
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.
*
@ -290,25 +385,24 @@ ecma_copy_or_ref_ecma_string (ecma_string_t *string_desc_p) /**< string descript
if (unlikely (string_desc_p->refs == 0))
{
/* reference counter has overflowed */
string_desc_p->refs--;
if (string_desc_p->container == ECMA_STRING_CONTAINER_CHARS_IN_DESC
|| string_desc_p->container == ECMA_STRING_CONTAINER_LIT_TABLE
|| string_desc_p->container == ECMA_STRING_CONTAINER_UINT32_IN_DESC)
uint32_t current_refs = string_desc_p->refs;
/* First trying to free unreachable objects that maybe refer to the string */
ecma_gc_run (ECMA_GC_GEN_COUNT - 1);
if (current_refs == string_desc_p->refs)
{
ecma_string_t *new_str_p = ecma_alloc_string ();
/* reference counter was not changed during GC, copying string */
*new_str_p = *string_desc_p;
new_str_p->refs = 1;
return new_str_p;
}
else
{
JERRY_UNIMPLEMENTED ("Unimplemented copy operation for strings, "
"stored in heap chunks or number, or concatenated strings.");
return ecma_copy_ecma_string (string_desc_p);
}
string_desc_p->refs++;
JERRY_ASSERT (string_desc_p->refs != 0);
}
return string_desc_p;