PERLVAR(Tcurstack, AV *) /* THE STACK */
PERLVAR(Tcurstackinfo, PERL_SI *) /* current stack + context */
PERLVAR(Tmainstack, AV *) /* the stack when nothing funny is happening */
+
PERLVAR(Ttop_env, JMPENV *) /* ptr. to current sigjmp() environment */
PERLVAR(Tstart_env, JMPENV) /* empty startup sigjmp() environment */
+PERLVARI(Tprotect, protect_proc_t, FUNC_NAME_TO_PTR(default_protect))
/* statics "owned" by various functions */
PERLVAR(Tav_fetch_sv, SV *) /* owned by av_fetch() */