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-rw-r--r--include/Support/DenseMap.h73
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diff --git a/include/Support/DenseMap.h b/include/Support/DenseMap.h
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--- a/include/Support/DenseMap.h
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-//===- DenseMap.h - A dense map implmentation -------------------*- 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 implements a dense map. A dense 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 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
-// the map has enough space for it.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef SUPPORT_DENSEMAP_H
-#define SUPPORT_DENSEMAP_H
-
-#include <vector>
-
-namespace llvm {
-
- struct IdentityFunctor : std::unary_function<unsigned, unsigned> {
- unsigned operator()(unsigned Index) const {
- return Index;
- }
- };
-
- template <typename T, typename ToIndexT = IdentityFunctor>
- class DenseMap {
- typedef typename ToIndexT::argument_type IndexT;
- typedef std::vector<T> StorageT;
- StorageT storage_;
- T nullVal_;
- ToIndexT toIndex_;
-
- public:
- DenseMap() : nullVal_(T()) { }
-
- explicit DenseMap(const T& val) : nullVal_(val) { }
-
- typename StorageT::reference operator[](IndexT 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)];
- }
-
- void clear() {
- storage_.clear();
- }
-
- void grow(IndexT n) {
- 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
-
-#endif