From c1dc0679706f7538cd17169b920967c54661e5b6 Mon Sep 17 00:00:00 2001
From: Jeffrey Yasskin <jyasskin@google.com>
Date: Mon, 22 Mar 2010 05:23:37 +0000
Subject: Free all Constants in ~LLVMConstantImpl.  We avoid assertion failures
 by dropping all references from all constants that can use other constants
 before trying to destroy any of them.

I also had to free bugpoint's Module in ~BugDriver().



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@99160 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/VMCore/ConstantsContext.h  |  4 ++--
 lib/VMCore/LLVMContextImpl.cpp | 29 +++++++++++++++++++++++++----
 tools/bugpoint/BugDriver.cpp   |  4 ++++
 tools/bugpoint/BugDriver.h     |  1 +
 4 files changed, 32 insertions(+), 6 deletions(-)

diff --git a/lib/VMCore/ConstantsContext.h b/lib/VMCore/ConstantsContext.h
index 560e6c4974..2f2fac53f0 100644
--- a/lib/VMCore/ConstantsContext.h
+++ b/lib/VMCore/ConstantsContext.h
@@ -600,8 +600,8 @@ public:
   void freeConstants() {
     for (typename MapTy::iterator I=Map.begin(), E=Map.end();
          I != E; ++I) {
-      if (I->second->use_empty())
-        delete I->second;
+      // Asserts that use_empty().
+      delete I->second;
     }
   }
     
diff --git a/lib/VMCore/LLVMContextImpl.cpp b/lib/VMCore/LLVMContextImpl.cpp
index 176ccf18e4..b4553ddc1b 100644
--- a/lib/VMCore/LLVMContextImpl.cpp
+++ b/lib/VMCore/LLVMContextImpl.cpp
@@ -12,6 +12,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "LLVMContextImpl.h"
+#include <algorithm>
 
 LLVMContextImpl::LLVMContextImpl(LLVMContext &C)
   : TheTrueVal(0), TheFalseVal(0),
@@ -34,10 +35,32 @@ LLVMContextImpl::LLVMContextImpl(LLVMContext &C)
   OpaqueTypes.insert(AlwaysOpaqueTy);
 }
 
+namespace {
+struct DropReferences {
+  // Takes the value_type of a ConstantUniqueMap's internal map, whose 'second'
+  // is a Constant*.
+  template<typename PairT>
+  void operator()(const PairT &P) {
+    P.second->dropAllReferences();
+  }
+};
+}
+
 LLVMContextImpl::~LLVMContextImpl() {
+  std::for_each(ExprConstants.map_begin(), ExprConstants.map_end(),
+                DropReferences());
+  std::for_each(ArrayConstants.map_begin(), ArrayConstants.map_end(),
+                DropReferences());
+  std::for_each(StructConstants.map_begin(), StructConstants.map_end(),
+                DropReferences());
+  std::for_each(UnionConstants.map_begin(), UnionConstants.map_end(),
+                DropReferences());
+  std::for_each(VectorConstants.map_begin(), VectorConstants.map_end(),
+                DropReferences());
   ExprConstants.freeConstants();
   ArrayConstants.freeConstants();
   StructConstants.freeConstants();
+  UnionConstants.freeConstants();
   VectorConstants.freeConstants();
   AggZeroConstants.freeConstants();
   NullPtrConstants.freeConstants();
@@ -45,13 +68,11 @@ LLVMContextImpl::~LLVMContextImpl() {
   InlineAsms.freeConstants();
   for (IntMapTy::iterator I = IntConstants.begin(), E = IntConstants.end(); 
        I != E; ++I) {
-    if (I->second->use_empty())
-      delete I->second;
+    delete I->second;
   }
   for (FPMapTy::iterator I = FPConstants.begin(), E = FPConstants.end(); 
        I != E; ++I) {
-    if (I->second->use_empty())
-      delete I->second;
+    delete I->second;
   }
   AlwaysOpaqueTy->dropRef();
   for (OpaqueTypesTy::iterator I = OpaqueTypes.begin(), E = OpaqueTypes.end();
diff --git a/tools/bugpoint/BugDriver.cpp b/tools/bugpoint/BugDriver.cpp
index 813c96cc79..024d8e219f 100644
--- a/tools/bugpoint/BugDriver.cpp
+++ b/tools/bugpoint/BugDriver.cpp
@@ -75,6 +75,10 @@ BugDriver::BugDriver(const char *toolname, bool as_child, bool find_bugs,
     run_as_child(as_child), run_find_bugs(find_bugs), Timeout(timeout), 
     MemoryLimit(memlimit), UseValgrind(use_valgrind) {}
 
+BugDriver::~BugDriver() {
+  delete Program;
+}
+
 
 /// ParseInputFile - Given a bitcode or assembly input filename, parse and
 /// return it, or return null if not possible.
diff --git a/tools/bugpoint/BugDriver.h b/tools/bugpoint/BugDriver.h
index 0a10a61c21..abc249868d 100644
--- a/tools/bugpoint/BugDriver.h
+++ b/tools/bugpoint/BugDriver.h
@@ -65,6 +65,7 @@ public:
   BugDriver(const char *toolname, bool as_child, bool find_bugs,
             unsigned timeout, unsigned memlimit, bool use_valgrind,
             LLVMContext& ctxt);
+  ~BugDriver();
 
   const char *getToolName() const { return ToolName; }
 
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