intrvar.h: document PL_tmps_max

Its name implies that it's the top allocated element; in fact it's top+1.

diff --git a/intrpvar.h b/intrpvar.h
index e54f53e..4f558a8 100644 (file)
--- a/intrpvar.h
+++ b/intrpvar.h
@@ -51,7 +51,7 @@ PERLVAR(I, scopestack_max, I32)
 PERLVAR(I, tmps_stack, SV **)          /* mortals we've made */
 PERLVARI(I, tmps_ix,   SSize_t,        -1)
 PERLVARI(I, tmps_floor,        SSize_t,        -1)
-PERLVAR(I, tmps_max,   SSize_t)
+PERLVAR(I, tmps_max,   SSize_t)        /* first unalloced slot in tmps stack */
 
 PERLVARI(I, sub_generation, U32, 1)    /* incr to invalidate method cache */