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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef ART_RUNTIME_DEX_CACHE_RESOLVED_CLASSES_H_
     18 #define ART_RUNTIME_DEX_CACHE_RESOLVED_CLASSES_H_
     19 
     20 #include <string>
     21 #include <unordered_set>
     22 #include <vector>
     23 
     24 #include "dex_file_types.h"
     25 
     26 namespace art {
     27 
     28 // Data structure for passing around which classes belonging to a dex cache / dex file are resolved.
     29 class DexCacheResolvedClasses {
     30  public:
     31   DexCacheResolvedClasses(const std::string& dex_location,
     32                           const std::string& base_location,
     33                           uint32_t location_checksum)
     34       : dex_location_(dex_location),
     35         base_location_(base_location),
     36         location_checksum_(location_checksum) {}
     37 
     38   // Only compare the key elements, ignore the resolved classes.
     39   int Compare(const DexCacheResolvedClasses& other) const {
     40     if (location_checksum_ != other.location_checksum_) {
     41       return static_cast<int>(location_checksum_ - other.location_checksum_);
     42     }
     43     // Don't need to compare base_location_ since dex_location_ has more info.
     44     return dex_location_.compare(other.dex_location_);
     45   }
     46 
     47   bool AddClass(dex::TypeIndex index) const {
     48     return classes_.insert(index).second;
     49   }
     50 
     51   template <class InputIt>
     52   void AddClasses(InputIt begin, InputIt end) const {
     53     classes_.insert(begin, end);
     54   }
     55 
     56   const std::string& GetDexLocation() const {
     57     return dex_location_;
     58   }
     59 
     60   const std::string& GetBaseLocation() const {
     61     return base_location_;
     62   }
     63 
     64   uint32_t GetLocationChecksum() const {
     65     return location_checksum_;
     66   }
     67 
     68   const std::unordered_set<dex::TypeIndex>& GetClasses() const {
     69     return classes_;
     70   }
     71 
     72  private:
     73   const std::string dex_location_;
     74   const std::string base_location_;
     75   const uint32_t location_checksum_;
     76   // Array of resolved class def indexes.
     77   mutable std::unordered_set<dex::TypeIndex> classes_;
     78 };
     79 
     80 inline bool operator<(const DexCacheResolvedClasses& a, const DexCacheResolvedClasses& b) {
     81   return a.Compare(b) < 0;
     82 }
     83 
     84 }  // namespace art
     85 
     86 #endif  // ART_RUNTIME_DEX_CACHE_RESOLVED_CLASSES_H_
     87