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