From a82c25a43488db9eb58d9daf6dd550a205c28d7b Mon Sep 17 00:00:00 2001
From: Lang Hames <lhames@gmail.com>
Date: Mon, 2 Apr 2018 21:39:39 +0000
Subject: [PATCH] [ORC] Add a debugging check to catch dangling references to
 SymbolStringPools.

llvm-svn: 329019
---
 llvm/include/llvm/ExecutionEngine/Orc/SymbolStringPool.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/llvm/include/llvm/ExecutionEngine/Orc/SymbolStringPool.h b/llvm/include/llvm/ExecutionEngine/Orc/SymbolStringPool.h
index da40d1c..de09c62 100644
--- a/llvm/include/llvm/ExecutionEngine/Orc/SymbolStringPool.h
+++ b/llvm/include/llvm/ExecutionEngine/Orc/SymbolStringPool.h
@@ -27,6 +27,9 @@ class SymbolStringPtr;
 class SymbolStringPool {
   friend class SymbolStringPtr;
 public:
+  /// @brief Destroy a SymbolStringPool.
+  ~SymbolStringPool();
+
   /// @brief Create a symbol string pointer from the given string.
   SymbolStringPtr intern(StringRef S);
 
@@ -109,6 +112,13 @@ inline bool operator<(const SymbolStringPtr &LHS, const SymbolStringPtr &RHS) {
   return LHS.S < RHS.S;
 }
 
+inline SymbolStringPool::~SymbolStringPool() {
+#ifndef NDEBUG
+  clearDeadEntries();
+  assert(Pool.empty() && "Dangling references at pool destruction time");
+#endif // NDEBUG
+}
+
 inline SymbolStringPtr SymbolStringPool::intern(StringRef S) {
   std::lock_guard<std::mutex> Lock(PoolMutex);
   PoolMap::iterator I;
-- 
2.7.4