Fix memory leak in YAML I/O.

Stop using BumpPtrAllocator for HNodes because
they have fields (vector, map) which require HNode 
destructors to be run.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171896 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Support/YAMLTraits.h

@@ -685,7 +685,8 @@ class Input : public IO {
 public:
   // Construct a yaml Input object from a StringRef and optional user-data.
   Input(StringRef InputContent, void *Ctxt=NULL);
-
+  ~Input();
+  
   // Check if there was an syntax or semantic error during parsing.
   llvm::error_code error();
 
@@ -718,6 +719,7 @@ private:
   class HNode {
   public:
     HNode(Node *n) : _node(n) { }
+    virtual ~HNode() { }
     static inline bool classof(const HNode *) { return true; }
 
     Node *_node;
@@ -726,6 +728,7 @@ private:
   class EmptyHNode : public HNode {
   public:
     EmptyHNode(Node *n) : HNode(n) { }
+    virtual ~EmptyHNode() {}
     static inline bool classof(const HNode *n) {
       return NullNode::classof(n->_node);
     }
@@ -735,6 +738,7 @@ private:
   class ScalarHNode : public HNode {
   public:
     ScalarHNode(Node *n, StringRef s) : HNode(n), _value(s) { }
+    virtual ~ScalarHNode() { }
 
     StringRef value() const { return _value; }
 
@@ -749,6 +753,7 @@ private:
   class MapHNode : public HNode {
   public:
     MapHNode(Node *n) : HNode(n) { }
+    virtual ~MapHNode();
 
     static inline bool classof(const HNode *n) {
       return MappingNode::classof(n->_node);
@@ -774,6 +779,7 @@ private:
   class SequenceHNode : public HNode {
   public:
     SequenceHNode(Node *n) : HNode(n) { }
+    virtual ~SequenceHNode();
 
     static inline bool classof(const HNode *n) {
       return SequenceNode::classof(n->_node);
@@ -795,10 +801,11 @@ public:
   void nextDocument();
 
 private:
-  llvm::yaml::Stream              *Strm;
-  llvm::SourceMgr                  SrcMgr;
+  llvm::SourceMgr                  SrcMgr; // must be before Strm
+  OwningPtr<llvm::yaml::Stream>    Strm;
+  OwningPtr<HNode>                 TopNode;
   llvm::error_code                 EC;
-  llvm::BumpPtrAllocator           Allocator;
+  llvm::BumpPtrAllocator           StringAllocator;
   llvm::yaml::document_iterator    DocIterator;
   std::vector<bool>                BitValuesUsed;
   HNode                           *CurrentNode;

lib/Support/YAMLTraits.cpp

@@ -40,11 +40,17 @@ void IO::setContext(void *Context) {
 //  Input
 //===----------------------------------------------------------------------===//
 
-Input::Input(StringRef InputContent, void *Ctxt) : IO(Ctxt), CurrentNode(NULL) {
-  Strm = new Stream(InputContent, SrcMgr);
+Input::Input(StringRef InputContent, void *Ctxt) 
+  : IO(Ctxt), 
+    Strm(new Stream(InputContent, SrcMgr)),
+    CurrentNode(NULL) {
   DocIterator = Strm->begin();
 }
 
+Input::~Input() {
+  
+}
+
 error_code Input::error() {
   return EC;
 }
@@ -65,7 +71,8 @@ bool Input::setCurrentDocument() {
       ++DocIterator;
       return setCurrentDocument();
     }
-    CurrentNode = this->createHNodes(N);
+    TopNode.reset(this->createHNodes(N));
+    CurrentNode = TopNode.get();
     return true;
   }
   return false;
@@ -271,13 +278,13 @@ Input::HNode *Input::createHNodes(Node *N) {
     if (!StringStorage.empty()) {
       // Copy string to permanent storage
       unsigned Len = StringStorage.size();
-      char *Buf = Allocator.Allocate<char>(Len);
+      char *Buf = StringAllocator.Allocate<char>(Len);
       memcpy(Buf, &StringStorage[0], Len);
       KeyStr = StringRef(Buf, Len);
     }
-    return new (Allocator) ScalarHNode(N, KeyStr);
+    return new ScalarHNode(N, KeyStr);
   } else if (SequenceNode *SQ = dyn_cast<SequenceNode>(N)) {
-    SequenceHNode *SQHNode = new (Allocator) SequenceHNode(N);
+    SequenceHNode *SQHNode = new SequenceHNode(N);
     for (SequenceNode::iterator i = SQ->begin(), End = SQ->end(); i != End;
          ++i) {
       HNode *Entry = this->createHNodes(i);
@@ -287,7 +294,7 @@ Input::HNode *Input::createHNodes(Node *N) {
     }
     return SQHNode;
   } else if (MappingNode *Map = dyn_cast<MappingNode>(N)) {
-    MapHNode *mapHNode = new (Allocator) MapHNode(N);
+    MapHNode *mapHNode = new MapHNode(N);
     for (MappingNode::iterator i = Map->begin(), End = Map->end(); i != End;
          ++i) {
       ScalarNode *KeyScalar = dyn_cast<ScalarNode>(i->getKey());
@@ -296,7 +303,7 @@ Input::HNode *Input::createHNodes(Node *N) {
       if (!StringStorage.empty()) {
         // Copy string to permanent storage
         unsigned Len = StringStorage.size();
-        char *Buf = Allocator.Allocate<char>(Len);
+        char *Buf = StringAllocator.Allocate<char>(Len);
         memcpy(Buf, &StringStorage[0], Len);
         KeyStr = StringRef(Buf, Len);
       }
@@ -307,7 +314,7 @@ Input::HNode *Input::createHNodes(Node *N) {
     }
     return mapHNode;
   } else if (isa<NullNode>(N)) {
-    return new (Allocator) EmptyHNode(N);
+    return new EmptyHNode(N);
   } else {
     setError(N, "unknown node kind");
     return NULL;
@@ -327,6 +334,22 @@ void Input::setError(const Twine &Message) {
   this->setError(CurrentNode, Message);
 }
 
+Input::MapHNode::~MapHNode() {
+  for (MapHNode::NameToNode::iterator i = Mapping.begin(), End = Mapping.end();
+                                                                i != End; ++i) {
+    delete i->second;
+  }
+}
+
+Input::SequenceHNode::~SequenceHNode() {
+  for (std::vector<HNode*>::iterator i = Entries.begin(), End = Entries.end();
+                                                                i != End; ++i) {
+    delete *i;
+  }
+}
+
+
+
 //===----------------------------------------------------------------------===//
 //  Output
 //===----------------------------------------------------------------------===//