void luaG_traceexec (lua_State *L) {
CallInfo *ci = L->ci;
lu_byte mask = L->hookmask;
int counthook = (--L->hookcount == 0 && (mask & LUA_MASKCOUNT));
if (counthook)
resethookcount(L); /* reset count */
else if (!(mask & LUA_MASKLINE))
return; /* no line hook and count != 0; nothing to be done */
if (ci->callstatus & CIST_HOOKYIELD) { /* called hook last time? */
ci->callstatus &= ~CIST_HOOKYIELD; /* erase mark */
return; /* do not call hook again (VM yielded, so it did not move) */
}
if (counthook)
luaD_hook(L, LUA_HOOKCOUNT, -1); /* call count hook */
if (mask & LUA_MASKLINE) {
Proto *p = ci_func(ci)->p;
int npc = pcRel(ci->u.l.savedpc, p);
int newline = getfuncline(p, npc);
if (npc == 0 || /* call linehook when enter a new function, */
ci->u.l.savedpc <= L->oldpc || /* when jump back (loop), or when */
newline != getfuncline(p, pcRel(L->oldpc, p))) /* enter a new line */
luaD_hook(L, LUA_HOOKLINE, newline); /* call line hook */
}
L->oldpc = ci->u.l.savedpc;
if (L->status == LUA_YIELD) { /* did hook yield? */
if (counthook)
L->hookcount = 1; /* undo decrement to zero */
ci->u.l.savedpc--; /* undo increment (resume will increment it again) */
ci->callstatus |= CIST_HOOKYIELD; /* mark that it yielded */
ci->func = L->top - 1; /* protect stack below results */
luaD_throw(L, LUA_YIELD);
}
}
/* 内部栈跟踪
* L 虚拟机状态
*/
static void traceexec (lua_State *L) {
CallInfo *ci = L->ci; /* 获取调用链表 */
lu_byte mask = L->hookmask; /* hook掩码 */
/* 如果hook计数等于0,则重新获取hook的数量 */
int counthook = ((mask & LUA_MASKCOUNT) && L->hookcount == 0);
/* 如果计数不为空，则重新设置 */
if (counthook)
resethookcount(L); /* reset count */
/* 最后一次调用hook函数 */
if (ci->callstatus & CIST_HOOKYIELD) { /* called hook last time? */
/* 取消hook调用掩码 */
ci->callstatus &= ~CIST_HOOKYIELD; /* erase mark */
return; /* do not call hook again (VM yielded, so it did not move) */
}
/* 如果hook计数不为空,则调用hook函数 */
if (counthook)
luaD_hook(L, LUA_HOOKCOUNT, -1); /* call count hook */
/* 行hook */
if (mask & LUA_MASKLINE) {
Proto *p = ci_func(ci)->p;
int npc = pcRel(ci->u.l.savedpc, p);
int newline = getfuncline(p, npc);
if (npc == 0 || /* call linehook when enter a new function, */
ci->u.l.savedpc <= L->oldpc || /* when jump back (loop), or when */
newline != getfuncline(p, pcRel(L->oldpc, p))) /* enter a new line */
luaD_hook(L, LUA_HOOKLINE, newline); /* call line hook */
}
/* 保存要返回的pc寄存器的值 */
L->oldpc = ci->u.l.savedpc;
/* 如果虚拟机的状态是挂起 */
if (L->status == LUA_YIELD) { /* did hook yield? */
if (counthook)
L->hookcount = 1; /* undo decrement to zero */
ci->u.l.savedpc--; /* undo increment (resume will increment it again) */
ci->callstatus |= CIST_HOOKYIELD; /* mark that it yielded */
ci->func = L->top - 1; /* protect stack below results */
luaD_throw(L, LUA_YIELD);
}
}
static void traceexec (lua_State *L) {
CallInfo *ci = L->ci;
lu_byte mask = L->hookmask;
if ((mask & LUA_MASKCOUNT) && L->hookcount == 0) {
resethookcount(L);
luaD_hook(L, LUA_HOOKCOUNT, -1);
}
if (mask & LUA_MASKLINE) {
Proto *p = ci_func(ci)->p;
int npc = pcRel(ci->u.l.savedpc, p);
int newline = getfuncline(p, npc);
if (npc == 0 || /* call linehook when enter a new function, */
ci->u.l.savedpc <= L->oldpc || /* when jump back (loop), or when */
newline != getfuncline(p, pcRel(L->oldpc, p))) /* enter a new line */
luaD_hook(L, LUA_HOOKLINE, newline);
}
L->oldpc = ci->u.l.savedpc;
if (L->status == LUA_YIELD) { /* did hook yield? */
ci->u.l.savedpc--; /* undo increment (resume will increment it again) */
luaD_throw(L, LUA_YIELD);
}
}
l_noret luaG_errormsg (lua_State *L) {
if (L->errfunc != 0) { /* is there an error handling function? */
StkId errfunc = restorestack(L, L->errfunc);
setobjs2s(L, L->top, L->top - 1); /* move argument */
setobjs2s(L, L->top - 1, errfunc); /* push function */
L->top++; /* assume EXTRA_STACK */
luaD_call(L, L->top - 2, 1, 0); /* call it */
}
#if LUA_TILDE_DEBUGGER
if (L->hookmask & LUA_MASKERROR)
luaD_hook(L, LUA_HOOKERROR, -1);
#endif /* LUA_TILDE_DEBUGGER */
luaD_throw(L, LUA_ERRRUN);
}
l_noret luaG_runerror (lua_State *L, const char *fmt, ...) {
CallInfo *ci = L->ci;
const char *msg;
va_list argp;
va_start(argp, fmt);
msg = luaO_pushvfstring(L, fmt, argp); /* format message */
va_end(argp);
if (isLua(ci)) /* if Lua function, add source:line information */
luaG_addinfo(L, msg, ci_func(ci)->p->source, currentline(ci));
#if LUA_TILDE_DEBUGGER
if (L->hookmask & LUA_MASKERROR)
luaD_hook(L, LUA_HOOKERROR, -1);
#endif /* LUA_TILDE_DEBUGGER */
luaG_errormsg(L);
}
