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/*
** VM event handling.
** Copyright (C) 2005-2022 Mike Pall. See Copyright Notice in luajit.h
*/
#include <stdio.h>
#define lj_vmevent_c
#define LUA_CORE
#include "lj_obj.h"
#include "lj_str.h"
#include "lj_tab.h"
#include "lj_state.h"
#include "lj_dispatch.h"
#include "lj_vm.h"
#include "lj_vmevent.h"
ptrdiff_t lj_vmevent_prepare(lua_State *L, VMEvent ev)
{
global_State *g = G(L);
GCstr *s = lj_str_newlit(L, LJ_VMEVENTS_REGKEY);
cTValue *tv = lj_tab_getstr(tabV(registry(L)), s);
if (tvistab(tv)) {
int hash = VMEVENT_HASH(ev);
tv = lj_tab_getint(tabV(tv), hash);
if (tv && tvisfunc(tv)) {
lj_state_checkstack(L, LUA_MINSTACK);
setfuncV(L, L->top++, funcV(tv));
if (LJ_FR2) setnilV(L->top++);
return savestack(L, L->top);
}
}
g->vmevmask &= ~VMEVENT_MASK(ev); /* No handler: cache this fact. */
return 0;
}
void lj_vmevent_call(lua_State *L, ptrdiff_t argbase)
{
global_State *g = G(L);
uint8_t oldmask = g->vmevmask;
uint8_t oldh = hook_save(g);
int status;
g->vmevmask = 0; /* Disable all events. */
hook_vmevent(g);
status = lj_vm_pcall(L, restorestack(L, argbase), 0+1, 0);
if (LJ_UNLIKELY(status)) {
/* Really shouldn't use stderr here, but where else to complain? */
L->top--;
fputs("VM handler failed: ", stderr);
fputs(tvisstr(L->top) ? strVdata(L->top) : "?", stderr);
fputc('\n', stderr);
}
hook_restore(g, oldh);
if (g->vmevmask != VMEVENT_NOCACHE)
g->vmevmask = oldmask; /* Restore event mask, but not if not modified. */
}
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