1//===-- tsan_stack_trace.cc -----------------------------------------------===// 2// 3// This file is distributed under the University of Illinois Open Source 4// License. See LICENSE.TXT for details. 5// 6//===----------------------------------------------------------------------===// 7// 8// This file is a part of ThreadSanitizer (TSan), a race detector. 9// 10//===----------------------------------------------------------------------===// 11#include "tsan_stack_trace.h" 12#include "tsan_rtl.h" 13#include "tsan_mman.h" 14 15namespace __tsan { 16 17VarSizeStackTrace::VarSizeStackTrace() 18 : StackTrace(nullptr, 0), trace_buffer(nullptr) {} 19 20VarSizeStackTrace::~VarSizeStackTrace() { 21 ResizeBuffer(0); 22} 23 24void VarSizeStackTrace::ResizeBuffer(uptr new_size) { 25 if (trace_buffer) { 26 internal_free(trace_buffer); 27 } 28 trace_buffer = 29 (new_size > 0) 30 ? (uptr *)internal_alloc(MBlockStackTrace, 31 new_size * sizeof(trace_buffer[0])) 32 : nullptr; 33 trace = trace_buffer; 34 size = new_size; 35} 36 37void VarSizeStackTrace::Init(const uptr *pcs, uptr cnt, uptr extra_top_pc) { 38 ResizeBuffer(cnt + !!extra_top_pc); 39 internal_memcpy(trace_buffer, pcs, cnt * sizeof(trace_buffer[0])); 40 if (extra_top_pc) 41 trace_buffer[cnt] = extra_top_pc; 42} 43 44void VarSizeStackTrace::ReverseOrder() { 45 for (u32 i = 0; i < (size >> 1); i++) 46 Swap(trace_buffer[i], trace_buffer[size - 1 - i]); 47} 48 49} // namespace __tsan 50