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
VarSizeStackTrace()18 VarSizeStackTrace::VarSizeStackTrace()
19 : StackTrace(nullptr, 0), trace_buffer(nullptr) {}
20
~VarSizeStackTrace()21 VarSizeStackTrace::~VarSizeStackTrace() {
22 ResizeBuffer(0);
23 }
24
ResizeBuffer(uptr new_size)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
Init(const uptr * pcs,uptr cnt,uptr extra_top_pc)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
ReverseOrder()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
UnwindImpl(uptr pc,uptr bp,void * context,bool request_fast,u32 max_depth)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