1 // Copyright 2018 The Android Open Source Project 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #pragma once 16 17 #include "aemu/base/Compiler.h" 18 19 #include <functional> 20 21 #include <inttypes.h> 22 23 // Convenience class ContiguousRangeMapper which makes it easier to collect 24 // contiguous ranges and run some function over the coalesced range. 25 26 namespace android { 27 namespace base { 28 29 class ContiguousRangeMapper { 30 public: 31 using Func = std::function<void(uintptr_t, uintptr_t)>; 32 33 ContiguousRangeMapper(Func&& mapFunc, uintptr_t batchSize = 0) : mMapFunc(std::move (mapFunc))34 mMapFunc(std::move(mapFunc)), mBatchSize(batchSize) { } 35 36 // add(): adds [start, start + size) to the internally tracked range. 37 // mMapFunc on the previous range runs if the new piece is not contiguous. 38 39 void add(uintptr_t start, uintptr_t size); 40 41 // Signals end of collection of pieces, running mMapFunc over any 42 // outstanding range. 43 void finish(); 44 45 // Destructor all runs mMapFunc if there is an outstanding range. 46 ~ContiguousRangeMapper(); 47 48 private: 49 Func mMapFunc = {}; 50 uintptr_t mBatchSize = 0; 51 bool mHasRange = false; 52 uintptr_t mStart = 0; 53 uintptr_t mEnd = 0; 54 DISALLOW_COPY_ASSIGN_AND_MOVE(ContiguousRangeMapper); 55 }; 56 57 } // namespace base 58 } // namespace android 59