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Improve the string descriptor.

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Separate the utf-8 and ascii strings.
In case of ascii strings the size is equal to the length, so we able to store this information
in the string descriptor instead of using the string header to store it.

JerryScript-DCO-1.0-Signed-off-by: Robert Sipka rsipka.uszeged@partner.samsung.com
This commit is contained in:
Robert Sipka
2016-04-15 10:19:47 +02:00
parent 54d6e1f44f
commit de1912f6f8
2 changed files with 201 additions and 55 deletions
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jerry-core/ecma/base/ecma-globals.h
+14 -3
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@@ -697,8 +697,8 @@ typedef struct
typedef enum
{
ECMA_STRING_CONTAINER_LIT_TABLE, /**< actual data is in literal table */
ECMA_STRING_CONTAINER_HEAP_CHUNKS, /**< actual data is on the heap
in a ecma_collection_chunk_t chain */
ECMA_STRING_CONTAINER_HEAP_ASCII_STRING, /**< actual data is on the heap as an ascii string */
ECMA_STRING_CONTAINER_HEAP_UTF8_STRING, /**< actual data is on the heap as an utf-8 string */
ECMA_STRING_CONTAINER_HEAP_NUMBER, /**< actual data is on the heap as a ecma_number_t */
ECMA_STRING_CONTAINER_UINT32_IN_DESC, /**< actual data is UInt32-represeneted Number
stored locally in the string's descriptor */
@@ -755,7 +755,18 @@ typedef struct ecma_string_t
mem_cpointer_t lit_cp;
/** Compressed pointer to an ecma_collection_header_t */
mem_cpointer_t collection_cp;
mem_cpointer_t utf8_collection_cp;
/**
* Actual data of an ascii string type
*/
struct
{
/** Compressed pointer to a raw character array */
mem_cpointer_t ascii_collection_cp;
/** Size of ascii string in bytes */
uint16_t size;
} ascii_string;
/** Compressed pointer to an ecma_number_t */
mem_cpointer_t number_cp;