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| author | Denys Vlasenko | 2021-09-08 09:52:04 +0200 |
|---|---|---|
| committer | Denys Vlasenko | 2021-09-08 09:52:04 +0200 |
| commit | 48cb983b136fb74c61db594a30e18bdc42b7264c (patch) | |
| tree | dfd043047bec76c4f09e9ff535e47bd449d1140a /miscutils/readahead.c | |
| parent | 8c68ae8416c8b54222eb3cd1d4908a570147e134 (diff) | |
| download | busybox-48cb983b136fb74c61db594a30e18bdc42b7264c.zip busybox-48cb983b136fb74c61db594a30e18bdc42b7264c.tar.gz | |
ash: parser: Get rid of PEOA
Upstream commit:
Date: Wed, 27 May 2020 12:19:13 +1000
parser: Get rid of PEOA
PEOA is a special character used to mark an alias as being finished
so that we don't enter an infinite loop with nested aliases. It
complicates the parser because we have to ensure that it is skipped
where necessary and not copied to the resulting token text.
This patch removes it and instead delays the marking of aliases
until the second pgetc. This has the same effect as the current
PEOA code while keeping the complexities within the input code.
This adds ~32 bytes of global data:
function old new delta
__pgetc - 512 +512
freestrings - 95 +95
popfile 86 110 +24
pushstring 141 160 +19
basepf 76 84 +8
syntax_index_table 258 257 -1
S_I_T 30 28 -2
.rodata 104255 104247 -8
pgetc_without_PEOA 13 - -13
xxreadtoken 230 215 -15
popstring 158 120 -38
readtoken1 3110 3045 -65
pgetc 547 22 -525
------------------------------------------------------------------------------
(add/remove: 2/1 grow/shrink: 3/7 up/down: 658/-667) Total: -9 bytes
text data bss dec hex filename
1043102 559 5020 1048681 100069 busybox_old
1043085 559 5052 1048696 100078 busybox_unstripped
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'miscutils/readahead.c')
0 files changed, 0 insertions, 0 deletions