third_party/tcmalloc/chromium/src/gperftools/stacktrace.h

   1 // Copyright (c) 2005, Google Inc.
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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 // Routines to extract the current stack trace.  These functions are
  34 // thread-safe.
  35
  36 #ifndef GOOGLE_STACKTRACE_H_
  37 #define GOOGLE_STACKTRACE_H_
  38
  39 // Annoying stuff for windows -- makes sure clients can import these functions
  40 #ifndef PERFTOOLS_DLL_DECL
  41 # ifdef _WIN32
  42 #   define PERFTOOLS_DLL_DECL  __declspec(dllimport)
  43 # else
  44 #   define PERFTOOLS_DLL_DECL
  45 # endif
  46 #endif
  47
  48
  49 // Skips the most recent "skip_count" stack frames (also skips the
  50 // frame generated for the "GetStackFrames" routine itself), and then
  51 // records the pc values for up to the next "max_depth" frames in
  52 // "result", and the corresponding stack frame sizes in "sizes".
  53 // Returns the number of values recorded in "result"/"sizes".
  54 //
  55 // Example:
  56 //      main() { foo(); }
  57 //      foo() { bar(); }
  58 //      bar() {
  59 //        void* result[10];
  60 //        int sizes[10];
  61 //        int depth = GetStackFrames(result, sizes, 10, 1);
  62 //      }
  63 //
  64 // The GetStackFrames call will skip the frame for "bar".  It will
  65 // return 2 and will produce pc values that map to the following
  66 // procedures:
  67 //      result[0]       foo
  68 //      result[1]       main
  69 // (Actually, there may be a few more entries after "main" to account for
  70 // startup procedures.)
  71 // And corresponding stack frame sizes will also be recorded:
  72 //    sizes[0]       16
  73 //    sizes[1]       16
  74 // (Stack frame sizes of 16 above are just for illustration purposes.)
  75 // Stack frame sizes of 0 or less indicate that those frame sizes couldn't
  76 // be identified.
  77 //
  78 // This routine may return fewer stack frame entries than are
  79 // available. Also note that "result" and "sizes" must both be non-NULL.
  80 extern PERFTOOLS_DLL_DECL int GetStackFrames(void** result, int* sizes, int max_depth,
  81                           int skip_count);
  82
  83 // Same as above, but to be used from a signal handler. The "uc" parameter
  84 // should be the pointer to ucontext_t which was passed as the 3rd parameter
  85 // to sa_sigaction signal handler. It may help the unwinder to get a
  86 // better stack trace under certain conditions. The "uc" may safely be NULL.
  87 extern PERFTOOLS_DLL_DECL int GetStackFramesWithContext(void** result, int* sizes, int max_depth,
  88                                      int skip_count, const void *uc);
  89
  90 // This is similar to the GetStackFrames routine, except that it returns
  91 // the stack trace only, and not the stack frame sizes as well.
  92 // Example:
  93 //      main() { foo(); }
  94 //      foo() { bar(); }
  95 //      bar() {
  96 //        void* result[10];
  97 //        int depth = GetStackTrace(result, 10, 1);
  98 //      }
  99 //
 100 // This produces:
 101 //      result[0]       foo
 102 //      result[1]       main
 103 //           ....       ...
 104 //
 105 // "result" must not be NULL.
 106 extern PERFTOOLS_DLL_DECL int GetStackTrace(void** result, int max_depth,
 107                                             int skip_count);
 108
 109 // Same as above, but to be used from a signal handler. The "uc" parameter
 110 // should be the pointer to ucontext_t which was passed as the 3rd parameter
 111 // to sa_sigaction signal handler. It may help the unwinder to get a
 112 // better stack trace under certain conditions. The "uc" may safely be NULL.
 113 extern PERFTOOLS_DLL_DECL int GetStackTraceWithContext(void** result, int max_depth,
 114                                     int skip_count, const void *uc);
 115
 116 #endif /* GOOGLE_STACKTRACE_H_ */