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   if (trace_buffer) {
  27     internal_free(trace_buffer);
  28   }
  29   trace_buffer =
  30       (new_size > 0)
  31           ? (uptr *)internal_alloc(MBlockStackTrace,
  32                                    new_size * sizeof(trace_buffer[0]))
  33           : nullptr;
  34   trace = trace_buffer;
  35   size = new_size;
  36 }
  37
  38 void VarSizeStackTrace::Init(const uptr *pcs, uptr cnt, uptr extra_top_pc) {
  39   ResizeBuffer(cnt + !!extra_top_pc);
  40   internal_memcpy(trace_buffer, pcs, cnt * sizeof(trace_buffer[0]));
  41   if (extra_top_pc)
  42     trace_buffer[cnt] = extra_top_pc;
  43 }
  44
  45 void VarSizeStackTrace::ReverseOrder() {
  46   for (u32 i = 0; i < (size >> 1); i++)
  47     Swap(trace_buffer[i], trace_buffer[size - 1 - i]);
  48 }
  49
  50 }  // namespace __tsan
  51
  52 #if !SANITIZER_GO
  53 void __sanitizer::BufferedStackTrace::UnwindImpl(
  54     uptr pc, uptr bp, void *context, bool request_fast, u32 max_depth) {
  55   uptr top = 0;
  56   uptr bottom = 0;
  57   if (StackTrace::WillUseFastUnwind(request_fast)) {
  58     GetThreadStackTopAndBottom(false, &top, &bottom);
  59     Unwind(max_depth, pc, bp, nullptr, top, bottom, true);
  60   } else
  61     Unwind(max_depth, pc, 0, context, 0, 0, false);
  62 }
  63 #endif  // SANITIZER_GO