forked from OSchip/llvm-project
118 lines
3.6 KiB
C++
118 lines
3.6 KiB
C++
//===- BlotMapVector.h - A MapVector with the blot operation ----*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TRANSFORMS_OBJCARC_BLOTMAPVECTOR_H
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#define LLVM_LIB_TRANSFORMS_OBJCARC_BLOTMAPVECTOR_H
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#include "llvm/ADT/DenseMap.h"
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#include <cassert>
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#include <cstddef>
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#include <utility>
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#include <vector>
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namespace llvm {
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/// An associative container with fast insertion-order (deterministic)
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/// iteration over its elements. Plus the special blot operation.
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template <class KeyT, class ValueT> class BlotMapVector {
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/// Map keys to indices in Vector.
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using MapTy = DenseMap<KeyT, size_t>;
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MapTy Map;
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/// Keys and values.
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using VectorTy = std::vector<std::pair<KeyT, ValueT>>;
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VectorTy Vector;
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public:
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#ifdef EXPENSIVE_CHECKS
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~BlotMapVector() {
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assert(Vector.size() >= Map.size()); // May differ due to blotting.
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for (typename MapTy::const_iterator I = Map.begin(), E = Map.end(); I != E;
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++I) {
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assert(I->second < Vector.size());
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assert(Vector[I->second].first == I->first);
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}
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for (typename VectorTy::const_iterator I = Vector.begin(), E = Vector.end();
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I != E; ++I)
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assert(!I->first || (Map.count(I->first) &&
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Map[I->first] == size_t(I - Vector.begin())));
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}
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#endif
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using iterator = typename VectorTy::iterator;
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using const_iterator = typename VectorTy::const_iterator;
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iterator begin() { return Vector.begin(); }
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iterator end() { return Vector.end(); }
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const_iterator begin() const { return Vector.begin(); }
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const_iterator end() const { return Vector.end(); }
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ValueT &operator[](const KeyT &Arg) {
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std::pair<typename MapTy::iterator, bool> Pair =
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Map.insert(std::make_pair(Arg, size_t(0)));
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if (Pair.second) {
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size_t Num = Vector.size();
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Pair.first->second = Num;
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Vector.push_back(std::make_pair(Arg, ValueT()));
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return Vector[Num].second;
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}
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return Vector[Pair.first->second].second;
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}
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std::pair<iterator, bool> insert(const std::pair<KeyT, ValueT> &InsertPair) {
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std::pair<typename MapTy::iterator, bool> Pair =
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Map.insert(std::make_pair(InsertPair.first, size_t(0)));
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if (Pair.second) {
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size_t Num = Vector.size();
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Pair.first->second = Num;
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Vector.push_back(InsertPair);
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return std::make_pair(Vector.begin() + Num, true);
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}
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return std::make_pair(Vector.begin() + Pair.first->second, false);
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}
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iterator find(const KeyT &Key) {
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typename MapTy::iterator It = Map.find(Key);
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if (It == Map.end())
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return Vector.end();
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return Vector.begin() + It->second;
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}
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const_iterator find(const KeyT &Key) const {
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typename MapTy::const_iterator It = Map.find(Key);
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if (It == Map.end())
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return Vector.end();
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return Vector.begin() + It->second;
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}
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/// This is similar to erase, but instead of removing the element from the
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/// vector, it just zeros out the key in the vector. This leaves iterators
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/// intact, but clients must be prepared for zeroed-out keys when iterating.
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void blot(const KeyT &Key) {
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typename MapTy::iterator It = Map.find(Key);
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if (It == Map.end())
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return;
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Vector[It->second].first = KeyT();
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Map.erase(It);
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}
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void clear() {
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Map.clear();
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Vector.clear();
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}
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bool empty() const {
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assert(Map.empty() == Vector.empty());
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return Map.empty();
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}
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};
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} // end namespace llvm
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#endif // LLVM_LIB_TRANSFORMS_OBJCARC_BLOTMAPVECTOR_H
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