--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/luajit/src/lj_vmevent.c	Thu Jan 22 20:10:30 2026 -0800
@@ -0,0 +1,58 @@
+/*
+** VM event handling.
+** Copyright (C) 2005-2023 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. */
+}
+