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Improve ecma_string_t descriptor (#3016)

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This patch introduces several changes conntect to ecma-strings:
 - Extend the size of the reference counter to 28 bytes from 13
 - Extend the size of the string hash to 32 bytes from 16 to use the extact FNV-1a hash
 - Introduce ECMA_STATIC_STRING_FLAG to reduce the number of string ref/derefs for static strings.
 - Introduce ECMA_STRING_CONTAINER_ASCII_STRING to store run-time allocated ASCII strings more efficiently
 - Remove ECMA_STRING_CONTAINER_LIT_NUMBER to half the storage size of the parsing time allocated floating point numbers
 - Rework the global number storage, to store only the floating point numbers
 - Optimize the lookup in the global number/string/symbol tables via reduce the number of NULL checks during decompressing the next element pointers
 - Reduce the code duplication in ecma_concat_ecma_strings and ecma_append_chars_to_string
 - Improve ecma_string_get_char with optional arguments to make it more reusable.

JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik frobert@inf.u-szeged.hu
This commit is contained in:
Robert Fancsik
2019-08-30 15:16:27 +02:00
committed by GitHub
parent f0578b2c25
commit c6a4a86257
15 changed files with 799 additions and 618 deletions
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jerry-core/ecma/base/ecma-helpers.h
+22 -5
View File
@@ -50,11 +50,17 @@
*/
#define ECMA_SET_POINTER(field, non_compressed_pointer) JMEM_CP_SET_POINTER (field, non_compressed_pointer)
/**
* Status flags for ecma_string_get_chars function
*/
typedef enum
{
ECMA_STRING_FLAG_EMPTY = 0,
ECMA_STRING_FLAG_IS_ASCII,
ECMA_STRING_FLAG_MUST_BE_FREED
ECMA_STRING_FLAG_EMPTY = 0, /**< No options are provided. */
ECMA_STRING_FLAG_IS_ASCII = (1 << 0), /**< The string contains only ASCII characters. */
ECMA_STRING_FLAG_REHASH_NEEDED = (1 << 1), /**< The hash of the string must be recalculated.
* For more details see ecma_append_chars_to_string */
ECMA_STRING_FLAG_IS_UINT32 = (1 << 2), /**< The string repesents an UINT32 number */
ECMA_STRING_FLAG_MUST_BE_FREED = (1 << 3), /**< The returned buffer must be freed */
} ecma_string_flag_t;
/**
@@ -65,7 +71,11 @@ typedef enum
utf8_str_size) /**< [out] output buffer size */ \
lit_utf8_size_t utf8_str_size; \
uint8_t utf8_ptr ## flags = ECMA_STRING_FLAG_EMPTY; \
const lit_utf8_byte_t *utf8_ptr = ecma_string_get_chars (ecma_str_ptr, &utf8_str_size, &utf8_ptr ## flags);
const lit_utf8_byte_t *utf8_ptr = ecma_string_get_chars (ecma_str_ptr, \
&utf8_str_size, \
NULL, \
NULL, \
&utf8_ptr ## flags);
/**
* Free the cesu-8 string buffer allocated by 'ECMA_STRING_TO_UTF8_STRING'
@@ -181,6 +191,7 @@ void ecma_check_value_type_is_spec_defined (ecma_value_t value);
ecma_value_t JERRY_ATTR_CONST ecma_make_boolean_value (bool boolean_value);
ecma_value_t JERRY_ATTR_CONST ecma_make_integer_value (ecma_integer_value_t integer_value);
ecma_value_t ecma_make_nan_value (void);
ecma_value_t ecma_make_float_value (ecma_number_t *ecma_num_p);
ecma_value_t ecma_make_number_value (ecma_number_t ecma_number);
ecma_value_t ecma_make_int32_value (int32_t int32_number);
ecma_value_t ecma_make_uint32_value (uint32_t uint32_number);
@@ -195,6 +206,7 @@ ecma_value_t JERRY_ATTR_PURE ecma_make_error_reference_value (const ecma_error_r
ecma_value_t JERRY_ATTR_PURE ecma_make_pointer_value (const void *any_p);
ecma_integer_value_t JERRY_ATTR_CONST ecma_get_integer_from_value (ecma_value_t value);
ecma_number_t JERRY_ATTR_PURE ecma_get_float_from_value (ecma_value_t value);
ecma_number_t * ecma_get_pointer_from_float_value (ecma_value_t value);
ecma_number_t JERRY_ATTR_PURE ecma_get_number_from_value (ecma_value_t value);
ecma_string_t JERRY_ATTR_PURE *ecma_get_string_from_value (ecma_value_t value);
#if ENABLED (JERRY_ES2015_BUILTIN_SYMBOL)
@@ -246,6 +258,7 @@ ecma_string_t *ecma_concat_ecma_strings (ecma_string_t *string1_p, ecma_string_t
ecma_string_t *ecma_append_magic_string_to_string (ecma_string_t *string1_p, lit_magic_string_id_t string2_id);
void ecma_ref_ecma_string (ecma_string_t *string_p);
void ecma_deref_ecma_string (ecma_string_t *string_p);
void ecma_destroy_ecma_string (ecma_string_t *string_p);
ecma_number_t ecma_string_to_number (const ecma_string_t *str_p);
uint32_t ecma_string_get_array_index (const ecma_string_t *str_p);
@@ -271,7 +284,11 @@ ecma_substring_copy_to_utf8_buffer (const ecma_string_t *string_desc_p,
lit_utf8_size_t buffer_size);
void ecma_string_to_utf8_bytes (const ecma_string_t *string_desc_p, lit_utf8_byte_t *buffer_p,
lit_utf8_size_t buffer_size);
const lit_utf8_byte_t *ecma_string_get_chars (const ecma_string_t *string_p, lit_utf8_size_t *size_p, uint8_t *flags_p);
const lit_utf8_byte_t *ecma_string_get_chars (const ecma_string_t *string_p,
lit_utf8_size_t *size_p,
lit_utf8_size_t *length_p,
lit_utf8_byte_t *uint32_buff_p,
uint8_t *flags_p);
bool ecma_compare_ecma_string_to_magic_id (const ecma_string_t *string_p, lit_magic_string_id_t id);
bool ecma_string_is_empty (const ecma_string_t *string_p);
bool ecma_string_is_length (const ecma_string_t *string_p);