third_party/tcmalloc/vendor/src/symbolize.h

   1 // Copyright (c) 2009, Google Inc.
   2 // All rights reserved.
   3 //
   4 // Redistribution and use in source and binary forms, with or without
   5 // modification, are permitted provided that the following conditions are
   6 // met:
   7 //
   8 //     * Redistributions of source code must retain the above copyright
   9 // notice, this list of conditions and the following disclaimer.
  10 //     * Redistributions in binary form must reproduce the above
  11 // copyright notice, this list of conditions and the following disclaimer
  12 // in the documentation and/or other materials provided with the
  13 // distribution.
  14 //     * Neither the name of Google Inc. nor the names of its
  15 // contributors may be used to endorse or promote products derived from
  16 // this software without specific prior written permission.
  17 //
  18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  21 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  22 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  23 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  24 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  25 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  26 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  27 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29
  30 // ---
  31 // Author: Craig Silverstein
  32
  33 #ifndef TCMALLOC_SYMBOLIZE_H_
  34 #define TCMALLOC_SYMBOLIZE_H_
  35
  36 #include "config.h"
  37 #ifdef HAVE_STDINT_H
  38 #include <stdint.h>  // for uintptr_t
  39 #endif
  40 #include <stddef.h>  // for NULL
  41 #include <map>
  42
  43 using std::map;
  44
  45 // SymbolTable encapsulates the address operations necessary for stack trace
  46 // symbolization. A common use-case is to Add() the addresses from one or
  47 // several stack traces to a table, call Symbolize() once and use GetSymbol()
  48 // to get the symbol names for pretty-printing the stack traces.
  49 class SymbolTable {
  50  public:
  51   SymbolTable()
  52     : symbol_buffer_(NULL) {}
  53   ~SymbolTable() {
  54     delete[] symbol_buffer_;
  55   }
  56
  57   // Adds an address to the table. This may overwrite a currently known symbol
  58   // name, so Add() should not generally be called after Symbolize().
  59   void Add(const void* addr);
  60
  61   // Returns the symbol name for addr, if the given address was added before
  62   // the last successful call to Symbolize(). Otherwise may return an empty
  63   // c-string.
  64   const char* GetSymbol(const void* addr);
  65
  66   // Obtains the symbol names for the addresses stored in the table and returns
  67   // the number of addresses actually symbolized.
  68   int Symbolize();
  69
  70  private:
  71   typedef map<const void*, const char*> SymbolMap;
  72
  73   // An average size of memory allocated for a stack trace symbol.
  74   static const int kSymbolSize = 1024;
  75
  76   // Map from addresses to symbol names.
  77   SymbolMap symbolization_table_;
  78
  79   // Pointer to the buffer that stores the symbol names.
  80   char *symbol_buffer_;
  81 };
  82
  83 #endif  // TCMALLOC_SYMBOLIZE_H_