third_party/tcmalloc/vendor/src/stack_trace_table.h

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  29
  30 // ---
  31 // Author: Andrew Fikes
  32 //
  33 // Utility class for coalescing sampled stack traces.  Not thread-safe.
  34
  35 #ifndef TCMALLOC_STACK_TRACE_TABLE_H_
  36 #define TCMALLOC_STACK_TRACE_TABLE_H_
  37
  38 #include <config.h>
  39 #ifdef HAVE_STDINT_H
  40 #include <stdint.h>                     // for uintptr_t
  41 #endif
  42 #include "common.h"
  43
  44 namespace tcmalloc {
  45
  46 class PERFTOOLS_DLL_DECL StackTraceTable {
  47  public:
  48   // REQUIRES: L < pageheap_lock
  49   StackTraceTable();
  50   ~StackTraceTable();
  51
  52   // Adds stack trace "t" to table.
  53   //
  54   // REQUIRES: L >= pageheap_lock
  55   void AddTrace(const StackTrace& t);
  56
  57   // Returns stack traces formatted per MallocExtension guidelines.
  58   // May return NULL on error.  Clears state before returning.
  59   //
  60   // REQUIRES: L < pageheap_lock
  61   void** ReadStackTracesAndClear();
  62
  63   // Exposed for PageHeapAllocator
  64   struct Bucket {
  65     // Key
  66     uintptr_t hash;
  67     StackTrace trace;
  68
  69     // Payload
  70     int count;
  71     Bucket* next;
  72
  73     bool KeyEqual(uintptr_t h, const StackTrace& t) const;
  74   };
  75
  76   // For testing
  77   int depth_total() const { return depth_total_; }
  78   int bucket_total() const { return bucket_total_; }
  79
  80  private:
  81   static const int kHashTableSize = 1 << 14; // => table_ is 128k
  82
  83   bool error_;
  84   int depth_total_;
  85   int bucket_total_;
  86   Bucket** table_;
  87 };
  88
  89 }  // namespace tcmalloc
  90
  91 #endif  // TCMALLOC_STACK_TRACE_TABLE_H_