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
VarSizeStackTrace()19 VarSizeStackTrace::VarSizeStackTrace()
20 : StackTrace(nullptr, 0), trace_buffer(nullptr) {}
21
~VarSizeStackTrace()22 VarSizeStackTrace::~VarSizeStackTrace() {
23 ResizeBuffer(0);
24 }
25
ResizeBuffer(uptr new_size)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
Init(const uptr * pcs,uptr cnt,uptr extra_top_pc)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
47