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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/jcontext/jcontext.h
+3 -3
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@@ -136,11 +136,11 @@ struct jerry_context_t
#endif /* ENABLED (JERRY_CPOINTER_32_BIT) */
const lit_utf8_byte_t * const *lit_magic_string_ex_array; /**< array of external magic strings */
const lit_utf8_size_t *lit_magic_string_ex_sizes; /**< external magic string lengths */
ecma_lit_storage_item_t *string_list_first_p; /**< first item of the literal string list */
jmem_cpointer_t string_list_first_cp; /**< first item of the literal string list */
#if ENABLED (JERRY_ES2015_BUILTIN_SYMBOL)
ecma_lit_storage_item_t *symbol_list_first_p; /**< first item of the global symbol list */
jmem_cpointer_t symbol_list_first_cp; /**< first item of the global symbol list */
#endif /* ENABLED (JERRY_ES2015_BUILTIN_SYMBOL) */
ecma_lit_storage_item_t *number_list_first_p; /**< first item of the literal number list */
jmem_cpointer_t number_list_first_cp; /**< first item of the literal number list */
jmem_cpointer_t ecma_global_lex_env_cp; /**< global lexical environment */
#if ENABLED (JERRY_ES2015_MODULE_SYSTEM)