-//===- DenseMap.h - A dense map implmentation -------------------*- C++ -*-===//
-//
+//===- llvm/ADT/IndexedMap.h - An index map implementation ------*- C++ -*-===//
+//
// The LLVM Compiler Infrastructure
//
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
-//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
//===----------------------------------------------------------------------===//
//
-// This file implements a dense map. A dense map template takes two
+// This file implements an indexed map. The index map template takes two
// types. The first is the mapped type and the second is a functor
-// that maps its argument to a size_t. On instanciation a "null" value
+// that maps its argument to a size_t. On instantiation a "null" value
// can be provided to be used as a "does not exist" indicator in the
// map. A member function grow() is provided that given the value of
// the maximally indexed key (the argument of the functor) makes sure
//
//===----------------------------------------------------------------------===//
-#ifndef SUPPORT_DENSEMAP_H
-#define SUPPORT_DENSEMAP_H
+#ifndef LLVM_ADT_INDEXEDMAP_H
+#define LLVM_ADT_INDEXEDMAP_H
+#include <functional>
#include <vector>
+#include <cassert>
namespace llvm {
-template <typename T, typename ToIndexT>
-class DenseMap {
+ struct IdentityFunctor : std::unary_function<unsigned, unsigned> {
+ unsigned operator()(unsigned Index) const {
+ return Index;
+ }
+ };
+
+ template <typename T, typename ToIndexT = IdentityFunctor>
+ class IndexedMap {
typedef typename ToIndexT::argument_type IndexT;
typedef std::vector<T> StorageT;
StorageT storage_;
T nullVal_;
ToIndexT toIndex_;
-public:
- DenseMap() { }
+ public:
+ IndexedMap() : nullVal_(T()) { }
- explicit DenseMap(const T& val) : nullVal_(val) { }
+ explicit IndexedMap(const T& val) : nullVal_(val) { }
typename StorageT::reference operator[](IndexT n) {
- assert(toIndex_(n) < storage_.size() && "index out of bounds!");
- return storage_[toIndex_(n)];
+ assert(toIndex_(n) < storage_.size() && "index out of bounds!");
+ return storage_[toIndex_(n)];
}
typename StorageT::const_reference operator[](IndexT n) const {
- assert(toIndex_(n) < storage_.size() && "index out of bounds!");
- return storage_[toIndex_(n)];
+ assert(toIndex_(n) < storage_.size() && "index out of bounds!");
+ return storage_[toIndex_(n)];
}
void clear() {
- storage_.assign(storage_.size(), nullVal_);
+ storage_.clear();
}
void grow(IndexT n) {
- storage_.resize(toIndex_(n) + 1, nullVal_);
+ unsigned NewSize = toIndex_(n) + 1;
+ if (NewSize > storage_.size())
+ storage_.resize(NewSize, nullVal_);
+ }
+
+ typename StorageT::size_type size() const {
+ return storage_.size();
}
-};
+ };
} // End llvm namespace