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   Free(trace_buffer);
27   trace_buffer = (new_size > 0)
28                      ? (uptr *)Alloc(new_size * sizeof(trace_buffer[0]))
29                      : nullptr;
30   trace = trace_buffer;
31   size = new_size;
32 }
33 
34 void VarSizeStackTrace::Init(const uptr *pcs, uptr cnt, uptr extra_top_pc) {
35   ResizeBuffer(cnt + !!extra_top_pc);
36   internal_memcpy(trace_buffer, pcs, cnt * sizeof(trace_buffer[0]));
37   if (extra_top_pc)
38     trace_buffer[cnt] = extra_top_pc;
39 }
40 
41 void VarSizeStackTrace::ReverseOrder() {
42   for (u32 i = 0; i < (size >> 1); i++)
43     Swap(trace_buffer[i], trace_buffer[size - 1 - i]);
44 }
45 
46 }  // namespace __tsan
47 
48 #if !SANITIZER_GO
49 void __sanitizer::BufferedStackTrace::UnwindImpl(
50     uptr pc, uptr bp, void *context, bool request_fast, u32 max_depth) {
51   uptr top = 0;
52   uptr bottom = 0;
53   GetThreadStackTopAndBottom(false, &top, &bottom);
54   bool fast = StackTrace::WillUseFastUnwind(request_fast);
55   Unwind(max_depth, pc, bp, context, top, bottom, fast);
56 }
57 #endif  // SANITIZER_GO
58