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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-value.c
+24
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@@ -459,6 +459,17 @@ ecma_create_float_number (ecma_number_t ecma_number) /**< value of the float num
return ecma_pointer_to_ecma_value (ecma_num_p) | ECMA_TYPE_FLOAT;
} /* ecma_create_float_number */
/**
* Encode float number without checks.
*
* @return ecma-value
*/
ecma_value_t
ecma_make_float_value (ecma_number_t *ecma_num_p) /**< pointer to the float number */
{
return ecma_pointer_to_ecma_value (ecma_num_p) | ECMA_TYPE_FLOAT;
} /* ecma_make_float_value */
/**
* Create a new NaN value.
*
@@ -696,6 +707,19 @@ ecma_get_float_from_value (ecma_value_t value) /**< ecma value */
return *(ecma_number_t *) ecma_get_pointer_from_ecma_value (value);
} /* ecma_get_float_from_value */
/**
* Get floating point value pointer from an ecma value
*
* @return floating point value
*/
inline ecma_number_t * JERRY_ATTR_PURE JERRY_ATTR_ALWAYS_INLINE
ecma_get_pointer_from_float_value (ecma_value_t value) /**< ecma value */
{
JERRY_ASSERT (ecma_get_value_type_field (value) == ECMA_TYPE_FLOAT);
return (ecma_number_t *) ecma_get_pointer_from_ecma_value (value);
} /* ecma_get_pointer_from_float_value */
/**
* Get floating point value from an ecma value
*