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Optimizations for line hook

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The function 'changedline' tries harder to avoid calling
'luaG_getfuncline' plus small changes in the use of 'L->oldpc'.
This commit is contained in:
Roberto Ierusalimschy
2021-01-28 14:40:29 -03:00
parent 58aa09a0b9
commit 949187b049
4 changed files with 47 additions and 33 deletions
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9
ldo.c
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@@ -331,6 +331,7 @@ void luaD_hook (lua_State *L, int event, int line,
** active.
*/
void luaD_hookcall (lua_State *L, CallInfo *ci) {
L->oldpc = 0; /* set 'oldpc' for new function */
if (L->hookmask & LUA_MASKCALL) { /* is call hook on? */
int event = (ci->callstatus & CIST_TAIL) ? LUA_HOOKTAILCALL
: LUA_HOOKCALL;
@@ -343,9 +344,9 @@ void luaD_hookcall (lua_State *L, CallInfo *ci) {
/*
** Executes a call hook for Lua and C functions. This function is called
** whenever 'hookmask' is not zero, so it checks whether return hooks are
** active.
** Executes a return hook for Lua and C functions and sets/corrects
** 'oldpc'. (Note that this correction is needed by the line hook, so it
** is done even when return hooks are off.)
*/
static void rethook (lua_State *L, CallInfo *ci, int nres) {
if (L->hookmask & LUA_MASKRET) { /* is return hook on? */
@@ -363,7 +364,7 @@ static void rethook (lua_State *L, CallInfo *ci, int nres) {
ci->func -= delta;
}
if (isLua(ci = ci->previous))
L->oldpc = pcRel(ci->u.l.savedpc, ci_func(ci)->p); /* update 'oldpc' */
L->oldpc = pcRel(ci->u.l.savedpc, ci_func(ci)->p); /* set 'oldpc' */
}