1 //===-- sanitizer_stackdepot.h ----------------------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file is shared between AddressSanitizer and ThreadSanitizer 11 // run-time libraries. 12 //===----------------------------------------------------------------------===// 13 14 #ifndef SANITIZER_STACKDEPOT_H 15 #define SANITIZER_STACKDEPOT_H 16 17 #include "sanitizer_common.h" 18 #include "sanitizer_internal_defs.h" 19 #include "sanitizer_stacktrace.h" 20 21 namespace __sanitizer { 22 23 // StackDepot efficiently stores huge amounts of stack traces. 24 struct StackDepotNode; 25 struct StackDepotHandle { 26 StackDepotNode *node_; 27 StackDepotHandle() : node_(nullptr) {} 28 explicit StackDepotHandle(StackDepotNode *node) : node_(node) {} 29 bool valid() { return node_; } 30 u32 id(); 31 int use_count(); 32 void inc_use_count_unsafe(); 33 }; 34 35 const int kStackDepotMaxUseCount = 1U << 20; 36 37 StackDepotStats *StackDepotGetStats(); 38 u32 StackDepotPut(StackTrace stack); 39 StackDepotHandle StackDepotPut_WithHandle(StackTrace stack); 40 // Retrieves a stored stack trace by the id. 41 StackTrace StackDepotGet(u32 id); 42 43 void StackDepotLockAll(); 44 void StackDepotUnlockAll(); 45 46 // Instantiating this class creates a snapshot of StackDepot which can be 47 // efficiently queried with StackDepotGet(). You can use it concurrently with 48 // StackDepot, but the snapshot is only guaranteed to contain those stack traces 49 // which were stored before it was instantiated. 50 class StackDepotReverseMap { 51 public: 52 StackDepotReverseMap(); 53 StackTrace Get(u32 id); 54 55 private: 56 struct IdDescPair { 57 u32 id; 58 StackDepotNode *desc; 59 60 static bool IdComparator(const IdDescPair &a, const IdDescPair &b); 61 }; 62 63 InternalMmapVector<IdDescPair> map_; 64 65 // Disallow evil constructors. 66 StackDepotReverseMap(const StackDepotReverseMap&); 67 void operator=(const StackDepotReverseMap&); 68 }; 69 70 } // namespace __sanitizer 71 72 #endif // SANITIZER_STACKDEPOT_H 73
