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