third_party/tcmalloc/chromium/src/stacktrace_generic-inl.h

   1 // Copyright (c) 2005, 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
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  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
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  28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  29
  30 // ---
  31 // Author: Sanjay Ghemawat
  32 //
  33 // Portable implementation - just use glibc
  34 //
  35 // Note:  The glibc implementation may cause a call to malloc.
  36 // This can cause a deadlock in HeapProfiler.
  37
  38 #ifndef BASE_STACKTRACE_GENERIC_INL_H_
  39 #define BASE_STACKTRACE_GENERIC_INL_H_
  40 // Note: this file is included into stacktrace.cc more than once.
  41 // Anything that should only be defined once should be here:
  42
  43 #include <execinfo.h>
  44 #include <string.h>
  45 #include "gperftools/stacktrace.h"
  46 #endif  // BASE_STACKTRACE_GENERIC_INL_H_
  47
  48 // Note: this part of the file is included several times.
  49 // Do not put globals below.
  50
  51 // The following 4 functions are generated from the code below:
  52 //   GetStack{Trace,Frames}()
  53 //   GetStack{Trace,Frames}WithContext()
  54 //
  55 // These functions take the following args:
  56 //   void** result: the stack-trace, as an array
  57 //   int* sizes: the size of each stack frame, as an array
  58 //               (GetStackFrames* only)
  59 //   int max_depth: the size of the result (and sizes) array(s)
  60 //   int skip_count: how many stack pointers to skip before storing in result
  61 //   void* ucp: a ucontext_t* (GetStack{Trace,Frames}WithContext only)
  62 int GET_STACK_TRACE_OR_FRAMES {
  63   static const int kStackLength = 64;
  64   void * stack[kStackLength];
  65   int size;
  66
  67   size = backtrace(stack, kStackLength);
  68   skip_count++;  // we want to skip the current frame as well
  69   int result_count = size - skip_count;
  70   if (result_count < 0)
  71     result_count = 0;
  72   if (result_count > max_depth)
  73     result_count = max_depth;
  74   for (int i = 0; i < result_count; i++)
  75     result[i] = stack[i + skip_count];
  76
  77 #if IS_STACK_FRAMES
  78   // No implementation for finding out the stack frame sizes yet.
  79   memset(sizes, 0, sizeof(*sizes) * result_count);
  80 #endif
  81
  82   return result_count;
  83 }