From 9f06724c0aa79957a9a3797f4fa89393bed98369 Mon Sep 17 00:00:00 2001
From: Rui Ueyama <ruiu@cs.stanford.edu>
Date: Mon, 12 Oct 2020 15:32:27 +0900
Subject: [PATCH] temporary

---
 chibild.h | 2 +-
 symtab.cc | 6 ++++--
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/chibild.h b/chibild.h
index 7c409d2b..4d07ad47 100644
--- a/chibild.h
+++ b/chibild.h
@@ -110,7 +110,7 @@ struct tbb_hash_compare<StringRef> {
 
 class SymbolTable {
 public:
-  void add(StringRef key, Symbol sym);
+  Symbol *add(StringRef key, Symbol sym);
   Symbol *get(StringRef key);
   std::vector<StringRef> get_keys();
 
diff --git a/symtab.cc b/symtab.cc
index 3506932f..0d502edf 100644
--- a/symtab.cc
+++ b/symtab.cc
@@ -1,10 +1,12 @@
 #include "chibild.h"
 
-void SymbolTable::add(StringRef name, Symbol sym) {
+Symbol *SymbolTable::add(StringRef name, Symbol sym) {
   MapType::accessor acc;
   map.insert(acc, name);
-  acc->second = sym;
+  if (acc->second.file == nullptr)
+    acc->second = sym;
   acc.release();
+  return nullptr;
 }
 
 Symbol *SymbolTable::get(StringRef name) {