src/libcompiler_builtins/compiler-rt/lib/tsan/rtl/tsan_stack_trace.cc

   1 //===-- tsan_stack_trace.cc -----------------------------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file is a part of ThreadSanitizer (TSan), a race detector.
  11 //
  12 //===----------------------------------------------------------------------===//
  13 #include "tsan_stack_trace.h"
  14 #include "tsan_rtl.h"
  15 #include "tsan_mman.h"
  16
  17 namespace __tsan {
  18
  19 VarSizeStackTrace::VarSizeStackTrace()
  20     : StackTrace(nullptr, 0), trace_buffer(nullptr) {}
  21
  22 VarSizeStackTrace::~VarSizeStackTrace() {
  23   ResizeBuffer(0);
  24 }
  25
  26 void VarSizeStackTrace::ResizeBuffer(uptr new_size) {
  27   if (trace_buffer) {
  28     internal_free(trace_buffer);
  29   }
  30   trace_buffer =
  31       (new_size > 0)
  32           ? (uptr *)internal_alloc(MBlockStackTrace,
  33                                    new_size * sizeof(trace_buffer[0]))
  34           : nullptr;
  35   trace = trace_buffer;
  36   size = new_size;
  37 }
  38
  39 void VarSizeStackTrace::Init(const uptr *pcs, uptr cnt, uptr extra_top_pc) {
  40   ResizeBuffer(cnt + !!extra_top_pc);
  41   internal_memcpy(trace_buffer, pcs, cnt * sizeof(trace_buffer[0]));
  42   if (extra_top_pc)
  43     trace_buffer[cnt] = extra_top_pc;
  44 }
  45
  46 }  // namespace __tsan