libsanitizer/sanitizer_common/sanitizer_procmaps.h

   1 //===-- sanitizer_procmaps.h ------------------------------------*- C++ -*-===//
   2 //
   3 // This file is distributed under the University of Illinois Open Source
   4 // License. See LICENSE.TXT for details.
   5 //
   6 //===----------------------------------------------------------------------===//
   7 //
   8 // This file is shared between AddressSanitizer and ThreadSanitizer.
   9 //
  10 // Information about the process mappings.
  11 //===----------------------------------------------------------------------===//
  12 #ifndef SANITIZER_PROCMAPS_H
  13 #define SANITIZER_PROCMAPS_H
  14
  15 #include "sanitizer_common.h"
  16 #include "sanitizer_internal_defs.h"
  17 #include "sanitizer_mutex.h"
  18
  19 namespace __sanitizer {
  20
  21 #if SANITIZER_FREEBSD || SANITIZER_LINUX
  22 struct ProcSelfMapsBuff {
  23   char *data;
  24   uptr mmaped_size;
  25   uptr len;
  26 };
  27
  28 // Reads process memory map in an OS-specific way.
  29 void ReadProcMaps(ProcSelfMapsBuff *proc_maps);
  30 #endif  // SANITIZER_FREEBSD || SANITIZER_LINUX
  31
  32 class MemoryMappingLayout {
  33  public:
  34   explicit MemoryMappingLayout(bool cache_enabled);
  35   ~MemoryMappingLayout();
  36   bool Next(uptr *start, uptr *end, uptr *offset,
  37             char filename[], uptr filename_size, uptr *protection);
  38   void Reset();
  39   // In some cases, e.g. when running under a sandbox on Linux, ASan is unable
  40   // to obtain the memory mappings. It should fall back to pre-cached data
  41   // instead of aborting.
  42   static void CacheMemoryMappings();
  43
  44   // Adds all mapped objects into a vector.
  45   void DumpListOfModules(InternalMmapVector<LoadedModule> *modules);
  46
  47   // Memory protection masks.
  48   static const uptr kProtectionRead = 1;
  49   static const uptr kProtectionWrite = 2;
  50   static const uptr kProtectionExecute = 4;
  51   static const uptr kProtectionShared = 8;
  52
  53  private:
  54   void LoadFromCache();
  55
  56   // FIXME: Hide implementation details for different platforms in
  57   // platform-specific files.
  58 # if SANITIZER_FREEBSD || SANITIZER_LINUX
  59   ProcSelfMapsBuff proc_self_maps_;
  60   const char *current_;
  61
  62   // Static mappings cache.
  63   static ProcSelfMapsBuff cached_proc_self_maps_;
  64   static StaticSpinMutex cache_lock_;  // protects cached_proc_self_maps_.
  65 # elif SANITIZER_MAC
  66   template<u32 kLCSegment, typename SegmentCommand>
  67   bool NextSegmentLoad(uptr *start, uptr *end, uptr *offset,
  68                        char filename[], uptr filename_size,
  69                        uptr *protection);
  70   int current_image_;
  71   u32 current_magic_;
  72   u32 current_filetype_;
  73   int current_load_cmd_count_;
  74   char *current_load_cmd_addr_;
  75 # endif
  76 };
  77
  78 typedef void (*fill_profile_f)(uptr start, uptr rss, bool file,
  79                                /*out*/uptr *stats, uptr stats_size);
  80
  81 // Parse the contents of /proc/self/smaps and generate a memory profile.
  82 // |cb| is a tool-specific callback that fills the |stats| array containing
  83 // |stats_size| elements.
  84 void GetMemoryProfile(fill_profile_f cb, uptr *stats, uptr stats_size);
  85
  86 // Returns code range for the specified module.
  87 bool GetCodeRangeForFile(const char *module, uptr *start, uptr *end);
  88
  89 bool IsDecimal(char c);
  90 uptr ParseDecimal(const char **p);
  91 bool IsHex(char c);
  92 uptr ParseHex(const char **p);
  93
  94 }  // namespace __sanitizer
  95
  96 #endif  // SANITIZER_PROCMAPS_H