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
15namespace __tsan {
16
17VarSizeStackTrace::VarSizeStackTrace()
18    : StackTrace(nullptr, 0), trace_buffer(nullptr) {}
19
20VarSizeStackTrace::~VarSizeStackTrace() {
21  ResizeBuffer(0);
22}
23
24void 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
37void 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
44void VarSizeStackTrace::ReverseOrder() {
45  for (u32 i = 0; i < (size >> 1); i++)
46    Swap(trace_buffer[i], trace_buffer[size - 1 - i]);
47}
48
49}  // namespace __tsan
50