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1 //===-- sanitizer_stackdepot.h ----------------------------------*- C++ -*-===//
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2 //
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3 // This file is distributed under the University of Illinois Open Source
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4 // License. See LICENSE.TXT for details.
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5 //
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6 //===----------------------------------------------------------------------===//
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7 //
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8 // This file is shared between AddressSanitizer and ThreadSanitizer
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9 // run-time libraries.
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10 //===----------------------------------------------------------------------===//
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11
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12 #ifndef SANITIZER_STACKDEPOT_H
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13 #define SANITIZER_STACKDEPOT_H
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14
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15 #include "sanitizer_common.h"
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16 #include "sanitizer_internal_defs.h"
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17 #include "sanitizer_stacktrace.h"
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18
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19 namespace __sanitizer {
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20
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21 // StackDepot efficiently stores huge amounts of stack traces.
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22 struct StackDepotNode;
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23 struct StackDepotHandle {
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24 StackDepotNode *node_;
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25 StackDepotHandle() : node_(nullptr) {}
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26 explicit StackDepotHandle(StackDepotNode *node) : node_(node) {}
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27 bool valid() { return node_; }
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28 u32 id();
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29 int use_count();
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30 void inc_use_count_unsafe();
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31 };
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32
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33 const int kStackDepotMaxUseCount = 1U << 20;
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34
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35 StackDepotStats *StackDepotGetStats();
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36 u32 StackDepotPut(StackTrace stack);
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37 StackDepotHandle StackDepotPut_WithHandle(StackTrace stack);
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38 // Retrieves a stored stack trace by the id.
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39 StackTrace StackDepotGet(u32 id);
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40
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41 void StackDepotLockAll();
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42 void StackDepotUnlockAll();
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43
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44 // Instantiating this class creates a snapshot of StackDepot which can be
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45 // efficiently queried with StackDepotGet(). You can use it concurrently with
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46 // StackDepot, but the snapshot is only guaranteed to contain those stack traces
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47 // which were stored before it was instantiated.
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48 class StackDepotReverseMap {
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49 public:
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50 StackDepotReverseMap();
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51 StackTrace Get(u32 id);
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52
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53 private:
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54 struct IdDescPair {
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55 u32 id;
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56 StackDepotNode *desc;
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57
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58 static bool IdComparator(const IdDescPair &a, const IdDescPair &b);
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59 };
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60
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61 InternalMmapVector<IdDescPair> map_;
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62
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63 // Disallow evil constructors.
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64 StackDepotReverseMap(const StackDepotReverseMap&);
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65 void operator=(const StackDepotReverseMap&);
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66 };
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67
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68 } // namespace __sanitizer
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69
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70 #endif // SANITIZER_STACKDEPOT_H
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