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| author | Denys Vlasenko | 2021-07-02 23:38:50 +0200 |
|---|---|---|
| committer | Denys Vlasenko | 2021-07-02 23:48:48 +0200 |
| commit | b705bf55395bf338f9b9888d87e418f67d4f1a29 (patch) | |
| tree | 9f496c19d55c9dc221abd4c895c7280d3a3e5095 /editors | |
| parent | 646429e05e2f62250da80aa8d98111f3a9818e9a (diff) | |
| download | busybox-b705bf55395bf338f9b9888d87e418f67d4f1a29.zip busybox-b705bf55395bf338f9b9888d87e418f67d4f1a29.tar.gz | |
awk: move match() code out-of-line
function old new delta
exec_builtin_match - 202 +202
exec_builtin 1434 1157 -277
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 0/1 up/down: 202/-277) Total: -75 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'editors')
| -rw-r--r-- | editors/awk.c | 45 |
1 files changed, 28 insertions, 17 deletions
diff --git a/editors/awk.c b/editors/awk.c index c06dd23..96e06db 100644 --- a/editors/awk.c +++ b/editors/awk.c @@ -2465,6 +2465,30 @@ static NOINLINE int do_mktime(const char *ds) return mktime(&then); } +/* Reduce stack usage in exec_builtin() by keeping match() code separate */ +static NOINLINE void exec_builtin_match(node *an1, const char *as0, var *res) +{ + regmatch_t pmatch[1]; + regex_t sreg, *re; + int n; + + re = as_regex(an1, &sreg); + n = regexec(re, as0, 1, pmatch, 0); + if (n == 0) { + pmatch[0].rm_so++; + pmatch[0].rm_eo++; + } else { + pmatch[0].rm_so = 0; + pmatch[0].rm_eo = -1; + } + if (re == &sreg) + regfree(re); + setvar_i(newvar("RSTART"), pmatch[0].rm_so); + setvar_i(newvar("RLENGTH"), pmatch[0].rm_eo - pmatch[0].rm_so); + setvar_i(res, pmatch[0].rm_so); +} + +/* Reduce stack usage in evaluate() by keeping builtins' code separate */ static NOINLINE var *exec_builtin(node *op, var *res) { #define tspl (G.exec_builtin__tspl) @@ -2473,8 +2497,6 @@ static NOINLINE var *exec_builtin(node *op, var *res) node *an[4]; var *av[4]; const char *as[4]; - regmatch_t pmatch[1]; - regex_t sreg, *re; node *spl; uint32_t isr, info; int nargs; @@ -2633,20 +2655,7 @@ static NOINLINE var *exec_builtin(node *op, var *res) break; case B_ma: - re = as_regex(an[1], &sreg); - n = regexec(re, as[0], 1, pmatch, 0); - if (n == 0) { - pmatch[0].rm_so++; - pmatch[0].rm_eo++; - } else { - pmatch[0].rm_so = 0; - pmatch[0].rm_eo = -1; - } - setvar_i(newvar("RSTART"), pmatch[0].rm_so); - setvar_i(newvar("RLENGTH"), pmatch[0].rm_eo - pmatch[0].rm_so); - setvar_i(res, pmatch[0].rm_so); - if (re == &sreg) - regfree(re); + exec_builtin_match(an[1], as[0], res); break; case B_ge: @@ -2732,7 +2741,9 @@ static rstream *next_input_file(void) /* * Evaluate node - the heart of the program. Supplied with subtree - * and place where to store result. Returns ptr to result. + * and "res" variable to assign the result to if we evaluate an expression. + * If node refers to e.g. a variable or a field, no assignment happens. + * Return ptr to the result (which may or may not be the "res" variable!) */ #define XC(n) ((n) >> 8) |