1 //===-- tsan_stack_trace.cpp ----------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file is a part of ThreadSanitizer (TSan), a race detector.
10 //
11 //===----------------------------------------------------------------------===//
12 #include "tsan_stack_trace.h"
13 #include "tsan_rtl.h"
14 #include "tsan_mman.h"
15 
16 namespace __tsan {
17 
18 VarSizeStackTrace::VarSizeStackTrace()
19     : StackTrace(nullptr, 0), trace_buffer(nullptr) {}
20 
21 VarSizeStackTrace::~VarSizeStackTrace() {
22   ResizeBuffer(0);
23 }
24 
25 void VarSizeStackTrace::ResizeBuffer(uptr new_size) {
26   if (trace_buffer) {
27     internal_free(trace_buffer);
28   }
29   trace_buffer =
30       (new_size > 0)
31           ? (uptr *)internal_alloc(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 void 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 
51 #if !SANITIZER_GO
52 void __sanitizer::BufferedStackTrace::UnwindImpl(
53     uptr pc, uptr bp, void *context, bool request_fast, u32 max_depth) {
54   uptr top = 0;
55   uptr bottom = 0;
56   GetThreadStackTopAndBottom(false, &top, &bottom);
57   bool fast = StackTrace::WillUseFastUnwind(request_fast);
58   Unwind(max_depth, pc, bp, context, top, bottom, fast);
59 }
60 #endif  // SANITIZER_GO
61