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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 _LIBUNWINDSTACK_MAPS_H
     18 #define _LIBUNWINDSTACK_MAPS_H
     19 
     20 #include <sys/types.h>
     21 #include <unistd.h>
     22 
     23 #include <string>
     24 #include <vector>
     25 
     26 #include <unwindstack/MapInfo.h>
     27 
     28 namespace unwindstack {
     29 
     30 // Special flag to indicate a map is in /dev/. However, a map in
     31 // /dev/ashmem/... does not set this flag.
     32 static constexpr int MAPS_FLAGS_DEVICE_MAP = 0x8000;
     33 
     34 class Maps {
     35  public:
     36   Maps() = default;
     37   virtual ~Maps();
     38 
     39   MapInfo* Find(uint64_t pc);
     40 
     41   virtual bool Parse();
     42 
     43   virtual const std::string GetMapsFile() const { return ""; }
     44 
     45   void Add(uint64_t start, uint64_t end, uint64_t offset, uint64_t flags, const std::string& name,
     46            uint64_t load_bias);
     47 
     48   typedef std::vector<MapInfo*>::iterator iterator;
     49   iterator begin() { return maps_.begin(); }
     50   iterator end() { return maps_.end(); }
     51 
     52   typedef std::vector<MapInfo*>::const_iterator const_iterator;
     53   const_iterator begin() const { return maps_.begin(); }
     54   const_iterator end() const { return maps_.end(); }
     55 
     56   size_t Total() { return maps_.size(); }
     57 
     58   MapInfo* Get(size_t index) {
     59     if (index >= maps_.size()) return nullptr;
     60     return maps_[index];
     61   }
     62 
     63  protected:
     64   std::vector<MapInfo*> maps_;
     65 };
     66 
     67 class RemoteMaps : public Maps {
     68  public:
     69   RemoteMaps(pid_t pid) : pid_(pid) {}
     70   virtual ~RemoteMaps() = default;
     71 
     72   virtual const std::string GetMapsFile() const override;
     73 
     74  private:
     75   pid_t pid_;
     76 };
     77 
     78 class LocalMaps : public RemoteMaps {
     79  public:
     80   LocalMaps() : RemoteMaps(getpid()) {}
     81   virtual ~LocalMaps() = default;
     82 };
     83 
     84 class BufferMaps : public Maps {
     85  public:
     86   BufferMaps(const char* buffer) : buffer_(buffer) {}
     87   virtual ~BufferMaps() = default;
     88 
     89   bool Parse() override;
     90 
     91  private:
     92   const char* buffer_;
     93 };
     94 
     95 class FileMaps : public Maps {
     96  public:
     97   FileMaps(const std::string& file) : file_(file) {}
     98   virtual ~FileMaps() = default;
     99 
    100   const std::string GetMapsFile() const override { return file_; }
    101 
    102  protected:
    103   const std::string file_;
    104 };
    105 
    106 }  // namespace unwindstack
    107 
    108 #endif  // _LIBUNWINDSTACK_MAPS_H
    109