Extend StringRef's edit-distance algorithm to permit an upper bound on the allowed...

[oota-llvm.git] / include / llvm / ADT / ScopedHashTable.h

diff --git a/include/llvm/ADT/ScopedHashTable.h b/include/llvm/ADT/ScopedHashTable.h
index df766935db7cfa57f3b4b3e276f5ccd00771f5b0..c96ad19707f38a2bdade59507120bde1bd05078b 100644 (file)
--- a/include/llvm/ADT/ScopedHashTable.h
+++ b/include/llvm/ADT/ScopedHashTable.h
@@ -36,10 +36,10 @@
 
 namespace llvm {
 
-template <typename K, typename V>
+template <typename K, typename V, typename KInfo = DenseMapInfo<K> >
 class ScopedHashTable;
 
-template <typename K, typename V>
+template <typename K, typename V, typename KInfo = DenseMapInfo<K> >
 class ScopedHashTableVal {
   ScopedHashTableVal *NextInScope;
   ScopedHashTableVal *NextForKey;
@@ -61,35 +61,39 @@ public:
   ScopedHashTableVal *getNextInScope() { return NextInScope; }
 };
 
-template <typename K, typename V>
+template <typename K, typename V, typename KInfo = DenseMapInfo<K> >
 class ScopedHashTableScope {
   /// HT - The hashtable that we are active for.
-  ScopedHashTable<K, V> &HT;
+  ScopedHashTable<K, V, KInfo> &HT;
 
   /// PrevScope - This is the scope that we are shadowing in HT.
   ScopedHashTableScope *PrevScope;
 
   /// LastValInScope - This is the last value that was inserted for this scope
   /// or null if none have been inserted yet.
-  ScopedHashTableVal<K,V> *LastValInScope;
+  ScopedHashTableVal<K, V, KInfo> *LastValInScope;
   void operator=(ScopedHashTableScope&);       // DO NOT IMPLEMENT
   ScopedHashTableScope(ScopedHashTableScope&); // DO NOT IMPLEMENT
 public:
-  ScopedHashTableScope(ScopedHashTable<K, V> &HT);
+  ScopedHashTableScope(ScopedHashTable<K, V, KInfo> &HT);
   ~ScopedHashTableScope();
 
 private:
-  friend class ScopedHashTable<K, V>;
-  ScopedHashTableVal<K, V> *getLastValInScope() { return LastValInScope; }
-  void setLastValInScope(ScopedHashTableVal<K,V> *Val) { LastValInScope = Val; }
+  friend class ScopedHashTable<K, V, KInfo>;
+  ScopedHashTableVal<K, V, KInfo> *getLastValInScope() {
+    return LastValInScope;
+  }
+  void setLastValInScope(ScopedHashTableVal<K, V, KInfo> *Val) {
+    LastValInScope = Val;
+  }
 };
 
 
-template <typename K, typename V>
+template <typename K, typename V, typename KInfo = DenseMapInfo<K> >
 class ScopedHashTableIterator {
-  ScopedHashTableVal<K,V> *Node;
+  ScopedHashTableVal<K, V, KInfo> *Node;
 public:
-  ScopedHashTableIterator(ScopedHashTableVal<K,V> *node) : Node(node){}
+  ScopedHashTableIterator(ScopedHashTableVal<K, V, KInfo> *node) : Node(node) {}
 
   V &operator*() const {
     assert(Node && "Dereference end()");
@@ -117,13 +121,13 @@ public:
 };
 
 
-template <typename K, typename V>
+template <typename K, typename V, typename KInfo>
 class ScopedHashTable {
-  DenseMap<K, ScopedHashTableVal<K,V>*> TopLevelMap;
-  ScopedHashTableScope<K, V> *CurScope;
+  DenseMap<K, ScopedHashTableVal<K, V, KInfo>*, KInfo> TopLevelMap;
+  ScopedHashTableScope<K, V, KInfo> *CurScope;
   ScopedHashTable(const ScopedHashTable&); // NOT YET IMPLEMENTED
   void operator=(const ScopedHashTable&);  // NOT YET IMPLEMENTED
-  friend class ScopedHashTableScope<K, V>;
+  friend class ScopedHashTableScope<K, V, KInfo>;
 public:
   ScopedHashTable() : CurScope(0) {}
   ~ScopedHashTable() {
@@ -135,25 +139,30 @@ public:
   }
 
   V lookup(const K &Key) {
-    return TopLevelMap[Key].getValue();
+    typename DenseMap<K, ScopedHashTableVal<K, V, KInfo>*, KInfo>::iterator
+      I = TopLevelMap.find(Key);
+    if (I != TopLevelMap.end())
+      return I->second->getValue();
+      
+    return V();
   }
 
   void insert(const K &Key, const V &Val) {
     assert(CurScope && "No scope active!");
 
-    ScopedHashTableVal<K,V> *&KeyEntry = TopLevelMap[Key];
+    ScopedHashTableVal<K, V, KInfo> *&KeyEntry = TopLevelMap[Key];
 
-    KeyEntry = new ScopedHashTableVal<K,V>(CurScope->getLastValInScope(),
-                                           KeyEntry, Key, Val);
+    KeyEntry= new ScopedHashTableVal<K, V, KInfo>(CurScope->getLastValInScope(),
+                                                  KeyEntry, Key, Val);
     CurScope->setLastValInScope(KeyEntry);
   }
 
-  typedef ScopedHashTableIterator<K, V> iterator;
+  typedef ScopedHashTableIterator<K, V, KInfo> iterator;
 
   iterator end() { return iterator(0); }
 
   iterator begin(const K &Key) {
-    typename DenseMap<K, ScopedHashTableVal<K,V>*>::iterator I =
+    typename DenseMap<K, ScopedHashTableVal<K, V, KInfo>*, KInfo>::iterator I =
       TopLevelMap.find(Key);
     if (I == TopLevelMap.end()) return end();
     return iterator(I->second);
@@ -162,28 +171,29 @@ public:
 
 /// ScopedHashTableScope ctor - Install this as the current scope for the hash
 /// table.
-template <typename K, typename V>
-ScopedHashTableScope<K, V>::ScopedHashTableScope(ScopedHashTable<K, V> &ht)
-  : HT(ht) {
+template <typename K, typename V, typename KInfo>
+ScopedHashTableScope<K, V, KInfo>::
+  ScopedHashTableScope(ScopedHashTable<K, V, KInfo> &ht) : HT(ht) {
   PrevScope = HT.CurScope;
   HT.CurScope = this;
   LastValInScope = 0;
 }
 
-template <typename K, typename V>
-ScopedHashTableScope<K, V>::~ScopedHashTableScope() {
+template <typename K, typename V, typename KInfo>
+ScopedHashTableScope<K, V, KInfo>::~ScopedHashTableScope() {
   assert(HT.CurScope == this && "Scope imbalance!");
   HT.CurScope = PrevScope;
 
   // Pop and delete all values corresponding to this scope.
-  while (ScopedHashTableVal<K, V> *ThisEntry = LastValInScope) {
+  while (ScopedHashTableVal<K, V, KInfo> *ThisEntry = LastValInScope) {
     // Pop this value out of the TopLevelMap.
     if (ThisEntry->getNextForKey() == 0) {
       assert(HT.TopLevelMap[ThisEntry->getKey()] == ThisEntry &&
              "Scope imbalance!");
       HT.TopLevelMap.erase(ThisEntry->getKey());
     } else {
-      ScopedHashTableVal<K,V> *&KeyEntry = HT.TopLevelMap[ThisEntry->getKey()];
+      ScopedHashTableVal<K, V, KInfo> *&KeyEntry =
+        HT.TopLevelMap[ThisEntry->getKey()];
       assert(KeyEntry == ThisEntry && "Scope imbalance!");
       KeyEntry = ThisEntry->getNextForKey();
     }