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Simplification and smaller buffers for 'lua_pushfstring'

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The function 'lua_pushfstring' is seldom called with large strings,
there is no need to optimize too much for that cases.
This commit is contained in:
Roberto Ierusalimschy 2020-07-03 11:36:56 -03:00
parent 56a165bf0f
commit e96385aded
2 changed files with 17 additions and 11 deletions
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26
lobject.c
View File

@ -215,7 +215,7 @@ static lua_Number lua_strx2number (const char *s, char **endptr) {
/* }====================================================== */
/* maximum length of a numeral */
/* maximum length of a numeral to be converted to a number */
#if !defined (L_MAXLENNUM)
#define L_MAXLENNUM 200
#endif
@ -333,8 +333,15 @@ int luaO_utf8esc (char *buff, unsigned long x) {
}
/* maximum length of the conversion of a number to a string */
#define MAXNUMBER2STR 50
/*
** Maximum length of the conversion of a number to a string. Must be
** enough to accommodate both LUA_INTEGER_FMT and LUA_NUMBER_FMT.
** (For a long long int, this is 19 digits plus a sign and a final '\0',
** adding to 21. For a long double, it can go to a sign, 33 digits,
** the dot, an exponent letter, an exponent sign, 5 exponent digits,
** and a final '\0', adding to 43.)
*/
#define MAXNUMBER2STR 44
/*
@ -375,7 +382,7 @@ void luaO_tostring (lua_State *L, TValue *obj) {
*/
/* size for buffer space used by 'luaO_pushvfstring' */
#define BUFVFS 400
#define BUFVFS 200
/* buffer used by 'luaO_pushvfstring' */
typedef struct BuffFS {
@ -387,16 +394,16 @@ typedef struct BuffFS {
/*
** Push given string to the stack, as part of the buffer. If the stack
** is almost full, join all partial strings in the stack into one.
** Push given string to the stack, as part of the buffer, and
** join the partial strings in the stack into one.
*/
static void pushstr (BuffFS *buff, const char *str, size_t l) {
lua_State *L = buff->L;
setsvalue2s(L, L->top, luaS_newlstr(L, str, l));
L->top++; /* may use one extra slot */
buff->pushed++;
if (buff->pushed > 1 && L->top + 1 >= L->stack_last) {
luaV_concat(L, buff->pushed); /* join all partial results into one */
if (buff->pushed > 1) {
luaV_concat(L, buff->pushed); /* join partial results into one */
buff->pushed = 1;
}
}
@ -521,8 +528,7 @@ const char *luaO_pushvfstring (lua_State *L, const char *fmt, va_list argp) {
}
addstr2buff(&buff, fmt, strlen(fmt)); /* rest of 'fmt' */
clearbuff(&buff); /* empty buffer into the stack */
if (buff.pushed > 1)
luaV_concat(L, buff.pushed); /* join all partial results */
lua_assert(buff.pushed == 1);
return svalue(s2v(L->top - 1));
}

2
testes/strings.lua
View File

@ -438,7 +438,7 @@ else
-- formats %U, %f, %I already tested elsewhere
local blen = 400 -- internal buffer length in 'luaO_pushfstring'
local blen = 200 -- internal buffer length in 'luaO_pushfstring'
local function callpfs (op, fmt, n)
local x = {T.testC("pushfstring" .. op .. "; return *", fmt, n)}