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All strings whose are valid array indicies always use the UINT32_IN_DESC format. (#1422)

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This patch reduces memory consumption for strings such as "0" or "123"
by 8 bytes and "4294967295" by 16 bytes. The hash computation is changed
for using the lower 16 bits for these strings which is much faster than
converting the value to string first and compute the hash. The trade-of
is a small overhead when strings are created or concatenated.

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com
This commit is contained in:
Zoltan Herczeg
2016-11-07 15:37:36 +01:00
committed by GitHub
parent 4c5ff4ad27
commit 9f556e1c38
8 changed files with 194 additions and 206 deletions
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jerry-core/ecma/base/ecma-helpers.h
+1 -1
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@@ -174,7 +174,7 @@ extern ecma_string_t *ecma_concat_ecma_strings (ecma_string_t *, ecma_string_t *
extern void ecma_ref_ecma_string (ecma_string_t *);
extern void ecma_deref_ecma_string (ecma_string_t *);
extern ecma_number_t ecma_string_to_number (const ecma_string_t *);
extern bool ecma_string_get_array_index (const ecma_string_t *, uint32_t *);
extern uint32_t ecma_string_get_array_index (const ecma_string_t *);
extern lit_utf8_size_t __attr_return_value_should_be_checked___
ecma_string_copy_to_utf8_buffer (const ecma_string_t *, lit_utf8_byte_t *, lit_utf8_size_t);