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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/builtin-objects/ecma-builtins.c
+3 -3
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@@ -659,9 +659,9 @@ ecma_builtin_try_to_instantiate_property (ecma_object_t *object_p, /**< object *
#if ENABLED (JERRY_ES2015_BUILTIN_SYMBOL)
if (JERRY_UNLIKELY (ecma_prop_name_is_symbol (string_p)))
{
if (string_p->hash & ECMA_GLOBAL_SYMBOL_FLAG)
if (string_p->u.hash & ECMA_GLOBAL_SYMBOL_FLAG)
{
magic_string_id = (string_p->hash >> ECMA_GLOBAL_SYMBOL_SHIFT);
magic_string_id = (string_p->u.hash >> ECMA_GLOBAL_SYMBOL_SHIFT);
}
}
#endif /* ENABLED (JERRY_ES2015_BUILTIN_SYMBOL) */
@@ -802,7 +802,7 @@ ecma_builtin_try_to_instantiate_property (ecma_object_t *object_p, /**< object *
ecma_string_t *symbol_p = ecma_new_symbol_from_descriptor_string (symbol_desc_value);
lit_magic_string_id_t symbol_id = (lit_magic_string_id_t) curr_property_p->value;
symbol_p->hash = (uint16_t) ((symbol_id << ECMA_GLOBAL_SYMBOL_SHIFT) | ECMA_GLOBAL_SYMBOL_FLAG);
symbol_p->u.hash = (uint16_t) ((symbol_id << ECMA_GLOBAL_SYMBOL_SHIFT) | ECMA_GLOBAL_SYMBOL_FLAG);
value = ecma_make_symbol_value (symbol_p);
break;