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      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