X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FADT%2FTinyPtrVector.h;h=d3d33b8adde1baa93f4a2fd1b60f48838aca5007;hb=5c5b3cf5b8af06b8e9347f3f45e8c67438ffd446;hp=ee86d8bdf70f529e895a82986aa32dfe95160db3;hpb=22e522e08640be459f237796009cf7666d6d75e7;p=oota-llvm.git

diff --git a/include/llvm/ADT/TinyPtrVector.h b/include/llvm/ADT/TinyPtrVector.h
index ee86d8bdf70..d3d33b8adde 100644
--- a/include/llvm/ADT/TinyPtrVector.h
+++ b/include/llvm/ADT/TinyPtrVector.h
@@ -10,8 +10,11 @@
 #ifndef LLVM_ADT_TINYPTRVECTOR_H
 #define LLVM_ADT_TINYPTRVECTOR_H
 
-#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/ArrayRef.h"
 #include "llvm/ADT/PointerUnion.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/Support/Compiler.h"
 
 namespace llvm {
   
@@ -25,18 +28,87 @@ template <typename EltTy>
 class TinyPtrVector {
 public:
   typedef llvm::SmallVector<EltTy, 4> VecTy;
+  typedef typename VecTy::value_type value_type;
+
   llvm::PointerUnion<EltTy, VecTy*> Val;
-  
+
   TinyPtrVector() {}
+  ~TinyPtrVector() {
+    if (VecTy *V = Val.template dyn_cast<VecTy*>())
+      delete V;
+  }
+
   TinyPtrVector(const TinyPtrVector &RHS) : Val(RHS.Val) {
     if (VecTy *V = Val.template dyn_cast<VecTy*>())
       Val = new VecTy(*V);
   }
-  ~TinyPtrVector() {
-    if (VecTy *V = Val.template dyn_cast<VecTy*>())
+  TinyPtrVector &operator=(const TinyPtrVector &RHS) {
+    if (this == &RHS)
+      return *this;
+    if (RHS.empty()) {
+      this->clear();
+      return *this;
+    }
+
+    // Try to squeeze into the single slot. If it won't fit, allocate a copied
+    // vector.
+    if (Val.template is<EltTy>()) {
+      if (RHS.size() == 1)
+        Val = RHS.front();
+      else
+        Val = new VecTy(*RHS.Val.template get<VecTy*>());
+      return *this;
+    }
+
+    // If we have a full vector allocated, try to re-use it.
+    if (RHS.Val.template is<EltTy>()) {
+      Val.template get<VecTy*>()->clear();
+      Val.template get<VecTy*>()->push_back(RHS.front());
+    } else {
+      *Val.template get<VecTy*>() = *RHS.Val.template get<VecTy*>();
+    }
+    return *this;
+  }
+
+#if LLVM_USE_RVALUE_REFERENCES
+  TinyPtrVector(TinyPtrVector &&RHS) : Val(RHS.Val) {
+    RHS.Val = (EltTy)0;
+  }
+  TinyPtrVector &operator=(TinyPtrVector &&RHS) {
+    if (this == &RHS)
+      return *this;
+    if (RHS.empty()) {
+      this->clear();
+      return *this;
+    }
+
+    // If this vector has been allocated on the heap, re-use it if cheap. If it
+    // would require more copying, just delete it and we'll steal the other
+    // side.
+    if (VecTy *V = Val.template dyn_cast<VecTy*>()) {
+      if (RHS.Val.template is<EltTy>()) {
+        V->clear();
+        V->push_back(RHS.front());
+        return *this;
+      }
       delete V;
+    }
+
+    Val = RHS.Val;
+    RHS.Val = (EltTy)0;
+    return *this;
   }
-  
+#endif
+
+  // implicit conversion operator to ArrayRef.
+  operator ArrayRef<EltTy>() const {
+    if (Val.isNull())
+      return ArrayRef<EltTy>();
+    if (Val.template is<EltTy>())
+      return *Val.getAddrOfPtr1();
+    return *Val.template get<VecTy*>();
+  }
+
   bool empty() const {
     // This vector can be empty if it contains no element, or if it
     // contains a pointer to an empty vector.
@@ -45,7 +117,7 @@ public:
       return Vec->empty();
     return false;
   }
-  
+
   unsigned size() const {
     if (empty())
       return 0;
@@ -53,67 +125,85 @@ public:
       return 1;
     return Val.template get<VecTy*>()->size();
   }
-  
-  typedef const EltTy *iterator;
-  iterator begin() const {
-    if (empty())
-      return 0;
-    
+
+  typedef const EltTy *const_iterator;
+  typedef EltTy *iterator;
+
+  iterator begin() {
     if (Val.template is<EltTy>())
-      return Val.template getAddrOf<EltTy>();
-    
+      return Val.getAddrOfPtr1();
+
     return Val.template get<VecTy *>()->begin();
 
   }
-  iterator end() const {
-    if (empty())
-      return 0;
-    
+  iterator end() {
     if (Val.template is<EltTy>())
-      return begin() + 1;
-    
+      return begin() + (Val.isNull() ? 0 : 1);
+
     return Val.template get<VecTy *>()->end();
   }
 
-  
+  const_iterator begin() const {
+    return (const_iterator)const_cast<TinyPtrVector*>(this)->begin();
+  }
+
+  const_iterator end() const {
+    return (const_iterator)const_cast<TinyPtrVector*>(this)->end();
+  }
+
   EltTy operator[](unsigned i) const {
     assert(!Val.isNull() && "can't index into an empty vector");
     if (EltTy V = Val.template dyn_cast<EltTy>()) {
       assert(i == 0 && "tinyvector index out of range");
       return V;
     }
-    
-    assert(i < Val.template get<VecTy*>()->size() && 
+
+    assert(i < Val.template get<VecTy*>()->size() &&
            "tinyvector index out of range");
     return (*Val.template get<VecTy*>())[i];
   }
-  
+
   EltTy front() const {
     assert(!empty() && "vector empty");
     if (EltTy V = Val.template dyn_cast<EltTy>())
       return V;
     return Val.template get<VecTy*>()->front();
   }
-  
+
+  EltTy back() const {
+    assert(!empty() && "vector empty");
+    if (EltTy V = Val.template dyn_cast<EltTy>())
+      return V;
+    return Val.template get<VecTy*>()->back();
+  }
+
   void push_back(EltTy NewVal) {
     assert(NewVal != 0 && "Can't add a null value");
-    
+
     // If we have nothing, add something.
     if (Val.isNull()) {
       Val = NewVal;
       return;
     }
-    
+
     // If we have a single value, convert to a vector.
     if (EltTy V = Val.template dyn_cast<EltTy>()) {
       Val = new VecTy();
       Val.template get<VecTy*>()->push_back(V);
     }
-    
+
     // Add the new value, we know we have a vector.
     Val.template get<VecTy*>()->push_back(NewVal);
   }
-  
+
+  void pop_back() {
+    // If we have a single value, convert to empty.
+    if (Val.template is<EltTy>())
+      Val = (EltTy)0;
+    else if (VecTy *Vec = Val.template get<VecTy*>())
+      Vec->pop_back();
+  }
+
   void clear() {
     // If we have a single value, convert to empty.
     if (Val.template is<EltTy>()) {
@@ -124,9 +214,77 @@ public:
     }
     // Otherwise, we're already empty.
   }
-  
-private:
-  void operator=(const TinyPtrVector&); // NOT IMPLEMENTED YET.
+
+  iterator erase(iterator I) {
+    assert(I >= begin() && "Iterator to erase is out of bounds.");
+    assert(I < end() && "Erasing at past-the-end iterator.");
+
+    // If we have a single value, convert to empty.
+    if (Val.template is<EltTy>()) {
+      if (I == begin())
+        Val = (EltTy)0;
+    } else if (VecTy *Vec = Val.template dyn_cast<VecTy*>()) {
+      // multiple items in a vector; just do the erase, there is no
+      // benefit to collapsing back to a pointer
+      return Vec->erase(I);
+    }
+    return end();
+  }
+
+  iterator erase(iterator S, iterator E) {
+    assert(S >= begin() && "Range to erase is out of bounds.");
+    assert(S <= E && "Trying to erase invalid range.");
+    assert(E <= end() && "Trying to erase past the end.");
+
+    if (Val.template is<EltTy>()) {
+      if (S == begin() && S != E)
+        Val = (EltTy)0;
+    } else if (VecTy *Vec = Val.template dyn_cast<VecTy*>()) {
+      return Vec->erase(S, E);
+    }
+    return end();
+  }
+
+  iterator insert(iterator I, const EltTy &Elt) {
+    assert(I >= this->begin() && "Insertion iterator is out of bounds.");
+    assert(I <= this->end() && "Inserting past the end of the vector.");
+    if (I == end()) {
+      push_back(Elt);
+      return llvm::prior(end());
+    }
+    assert(!Val.isNull() && "Null value with non-end insert iterator.");
+    if (EltTy V = Val.template dyn_cast<EltTy>()) {
+      assert(I == begin());
+      Val = Elt;
+      push_back(V);
+      return begin();
+    }
+
+    return Val.template get<VecTy*>()->insert(I, Elt);
+  }
+
+  template<typename ItTy>
+  iterator insert(iterator I, ItTy From, ItTy To) {
+    assert(I >= this->begin() && "Insertion iterator is out of bounds.");
+    assert(I <= this->end() && "Inserting past the end of the vector.");
+    if (From == To)
+      return I;
+
+    // If we have a single value, convert to a vector.
+    ptrdiff_t Offset = I - begin();
+    if (Val.isNull()) {
+      if (llvm::next(From) == To) {
+        Val = *From;
+        return begin();
+      }
+
+      Val = new VecTy();
+    } else if (EltTy V = Val.template dyn_cast<EltTy>()) {
+      Val = new VecTy();
+      Val.template get<VecTy*>()->push_back(V);
+    }
+    return Val.template get<VecTy*>()->insert(begin() + Offset, From, To);
+  }
 };
 } // end namespace llvm