release the phrasetable when the concrete syntax is released

src/runtime/c/pgf/data.cxx

@@ -41,6 +41,7 @@ void PgfConcr::release(ref<PgfConcr> concr)
     namespace_release(concr->lins);
     namespace_release(concr->lincats);
     namespace_release(concr->printnames);
+    phrasetable_release(concr->phrasetable);
     PgfDB::free(concr, concr->name.size+1);
 }
 

src/runtime/c/pgf/phrasetable.cxx

@@ -394,6 +394,7 @@ int symbol_cmp(PgfSymbol sym1, PgfSymbol sym2)
     }
 }
 
+PGF_INTERNAL
 void phrasetable_iter(PgfPhrasetable table, ref<PgfConcrLincat> lincat, std::function<void(ref<PgfSymbolCCat> arg,size_t,vector<ref<PgfItem>>)> &f)
 {
     if (table == 0)
@@ -420,6 +421,7 @@ void phrasetable_iter(PgfPhrasetable table, ref<PgfConcrLincat> lincat, std::fun
     }
 }
 
+PGF_INTERNAL
 vector<ref<PgfItem>> phrasetable_lookup(PgfPhrasetable table, PgfSymbol sym, size_t *n_items)
 {
     while (table != 0) {
@@ -438,6 +440,7 @@ vector<ref<PgfItem>> phrasetable_lookup(PgfPhrasetable table, PgfSymbol sym, siz
     return 0;
 }
 
+PGF_INTERNAL
 vector<ref<PgfItem>> phrasetable_lookup(PgfPhrasetable phrasetable,
                                         ref<PgfConcrLincat> lincat,
                                         size_t *n_items)
@@ -826,3 +829,17 @@ PgfPhrasetable phrasetable_insert(PgfPhrasetable table,
         return new_table;
     }
 }
+
+PGF_INTERNAL
+void phrasetable_release(PgfPhrasetable table)
+{
+    if (table == 0)
+        return;
+    phrasetable_release(table->left);
+    phrasetable_release(table->right);
+    for (size_t i = 0; i < table->value.n_items; i++) {
+        PgfItem::release(table->value.items[i]);
+    }
+    vector<ref<PgfItem>>::release(table->value.items);
+    Node<PgfPhrasetableValue>::release(table);
+}

src/runtime/c/pgf/phrasetable.h

@@ -32,6 +32,14 @@ struct PGF_INTERNAL_DECL PgfItem {
         }
     } args;
 
+    static
+    void release(ref<PgfItem> item) {
+        size_t ex_size =
+            sizeof(ref<PgfSymbolCCat>) * item->args.size() +
+            sizeof(size_t)             * item->vars.size();
+        PgfDB::free(item, ex_size);
+    }
+
     uint16_t pre_alt;
     uint16_t pre_dot;
     uint16_t dot;
@@ -91,4 +99,7 @@ void phrasetable_lookup_cohorts(PgfPhrasetable phrasetable,
                                 bool case_sensitive,
                                 PgfPhraseScanner *scanner, PgfExn* err);
 
+PGF_INTERNAL_DECL
+void phrasetable_release(PgfPhrasetable table);
+
 #endif