From 8a7ad2d2c5940fd3bf1a0a6f2a0271e57df2d005 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Fri, 19 Nov 2004 16:39:44 +0000
Subject: Add hooks to free all memory allocated by the singleton factories in
 these files.  Patch contributed by Morten Ofstad!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17995 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/VMCore/Constants.cpp | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

(limited to 'lib/VMCore/Constants.cpp')

diff --git a/lib/VMCore/Constants.cpp b/lib/VMCore/Constants.cpp
index b5831ae..97e4fa5 100644
--- a/lib/VMCore/Constants.cpp
+++ b/lib/VMCore/Constants.cpp
@@ -612,6 +612,16 @@ namespace {
 
     typedef std::map<const TypeClass*, MapIterator> AbstractTypeMapTy;
     AbstractTypeMapTy AbstractTypeMap;
+
+    friend void Constant::clearAllValueMaps();
+  private:
+    void clear(std::vector<Constant *> &Constants) {
+      for(MapIterator I = Map.begin(); I != Map.end(); ++I)
+        Constants.push_back(I->second);
+      Map.clear();
+      AbstractTypeMap.clear();
+    }
+
   public:
     // getOrCreate - Return the specified constant from the map, creating it if
     // necessary.
@@ -1401,3 +1411,29 @@ const char *ConstantExpr::getOpcodeName() const {
   return Instruction::getOpcodeName(getOpcode());
 }
 
+/// clearAllValueMaps - This method frees all internal memory used by the
+/// constant subsystem, which can be used in environments where this memory
+/// is otherwise reported as a leak.
+void Constant::clearAllValueMaps() {
+  std::vector<Constant *> Constants;
+
+  DoubleConstants.clear(Constants);
+  FloatConstants.clear(Constants);
+  SIntConstants.clear(Constants);
+  UIntConstants.clear(Constants);
+  AggZeroConstants.clear(Constants);
+  ArrayConstants.clear(Constants);
+  StructConstants.clear(Constants);
+  PackedConstants.clear(Constants);
+  NullPtrConstants.clear(Constants);
+  UndefValueConstants.clear(Constants);
+  ExprConstants.clear(Constants);
+
+  for (std::vector<Constant *>::iterator I = Constants.begin(), 
+       E = Constants.end(); I != E; ++I)
+    (*I)->dropAllReferences();
+  for (std::vector<Constant *>::iterator I = Constants.begin(),
+       E = Constants.end(); I != E; ++I)
+    (*I)->destroyConstantImpl();
+  Constants.clear();
+}
-- 
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