From c26d5c114a13eaea07b80e61e51c2b8f78caf6b7 Mon Sep 17 00:00:00 2001
From: "Sven M. Hallberg" <pesco@khjk.org>
Date: Sun, 5 May 2013 11:17:57 +0200
Subject: [PATCH] totally forgot to record the start symbol of the grammar

---
 src/backends/ll.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/backends/ll.c b/src/backends/ll.c
index 86f6411..3c8d5c9 100644
--- a/src/backends/ll.c
+++ b/src/backends/ll.c
@@ -7,6 +7,7 @@
 /* Grammar representation and analysis */
 
 typedef struct HCFGrammar_ {
+  HCFChoice   *start;   // start symbol (nonterminal)
   HHashSet    *nts;     // HCFChoices, each representing the alternative
                         // productions for one nonterminal
   HHashSet    *geneps;  // set of NTs that can generate the empty string
@@ -56,7 +57,7 @@ HCFGrammar *h_grammar(HAllocator* mm__, const HParser *parser)
   // represent a nonterminal (type HCF_CHOICE or HCF_CHARSET).
   collect_nts(g, desugared);
   if(h_hashset_empty(g->nts)) {
-    // desugared is a single terminal. wrap it in a singleton HCF_CHOICE.
+    // desugared is a terminal. wrap it in a singleton HCF_CHOICE.
     HCFChoice *nt = h_new(HCFChoice, 1);
     nt->type = HCF_CHOICE;
     nt->seq = h_new(HCFSequence *, 2);
@@ -66,6 +67,9 @@ HCFGrammar *h_grammar(HAllocator* mm__, const HParser *parser)
     nt->seq[0]->items[1] = NULL;
     nt->seq[1] = NULL;
     h_hashset_put(g->nts, nt);
+    g->start = nt;
+  } else {
+    g->start = desugared;
   }
 
   // XXX call collect_geneps here?