libsanitizer/tsan/tsan_stack_trace.cc

   1 //===-- tsan_stack_trace.cc -----------------------------------------------===//
   2 //
   3 // This file is distributed under the University of Illinois Open Source
   4 // License. See LICENSE.TXT for details.
   5 //
   6 //===----------------------------------------------------------------------===//
   7 //
   8 // This file is a part of ThreadSanitizer (TSan), a race detector.
   9 //
  10 //===----------------------------------------------------------------------===//
  11 #include "tsan_stack_trace.h"
  12 #include "tsan_rtl.h"
  13 #include "tsan_mman.h"
  14
  15 namespace __tsan {
  16
  17 VarSizeStackTrace::VarSizeStackTrace()
  18     : StackTrace(nullptr, 0), trace_buffer(nullptr) {}
  19
  20 VarSizeStackTrace::~VarSizeStackTrace() {
  21   ResizeBuffer(0);
  22 }
  23
  24 void VarSizeStackTrace::ResizeBuffer(uptr new_size) {
  25   if (trace_buffer) {
  26     internal_free(trace_buffer);
  27   }
  28   trace_buffer =
  29       (new_size > 0)
  30           ? (uptr *)internal_alloc(MBlockStackTrace,
  31                                    new_size * sizeof(trace_buffer[0]))
  32           : nullptr;
  33   trace = trace_buffer;
  34   size = new_size;
  35 }
  36
  37 void VarSizeStackTrace::Init(const uptr *pcs, uptr cnt, uptr extra_top_pc) {
  38   ResizeBuffer(cnt + !!extra_top_pc);
  39   internal_memcpy(trace_buffer, pcs, cnt * sizeof(trace_buffer[0]));
  40   if (extra_top_pc)
  41     trace_buffer[cnt] = extra_top_pc;
  42 }
  43
  44 }  // namespace __tsan