FFI: Add callback support (for x86/x64).

src/lj_ccallback.h

@@ -0,0 +1,25 @@
+/*
+** FFI C callback handling.
+** Copyright (C) 2005-2011 Mike Pall. See Copyright Notice in luajit.h
+*/
+
+#ifndef _LJ_CCALLBACK_H
+#define _LJ_CCALLBACK_H
+
+#include "lj_obj.h"
+#include "lj_ctype.h"
+
+#if LJ_HASFFI
+
+/* Really belongs to lj_vm.h. */
+LJ_ASMF void lj_vm_ffi_callback(void);
+
+LJ_FUNC MSize lj_ccallback_ptr2slot(CTState *cts, void *p);
+LJ_FUNCA lua_State * LJ_FASTCALL lj_ccallback_enter(CTState *cts, void *cf);
+LJ_FUNCA void LJ_FASTCALL lj_ccallback_leave(CTState *cts, TValue *o);
+LJ_FUNC void *lj_ccallback_new(CTState *cts, CType *ct, GCfunc *fn);
+LJ_FUNC void lj_ccallback_mcode_free(CTState *cts);
+
+#endif
+
+#endif