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 15 namespace __tsan { 16 17 VarSizeStackTrace::VarSizeStackTrace() 18 : StackTrace(nullptr, 0), trace_buffer(nullptr) {} 19 20 VarSizeStackTrace::~VarSizeStackTrace() { 21 ResizeBuffer(0); 22 } 23 24 void 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 37 void 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 44 } // namespace __tsan 45