libsanitizer/tsan/tsan_stack_trace.cpp

   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