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 if (trace_buffer) { 27 internal_free(trace_buffer); 28 } 29 trace_buffer = 30 (new_size > 0) 31 ? (uptr *)internal_alloc(MBlockStackTrace, 32 new_size * sizeof(trace_buffer[0])) 33 : nullptr; 34 trace = trace_buffer; 35 size = new_size; 36 } 37 38 void VarSizeStackTrace::Init(const uptr *pcs, uptr cnt, uptr extra_top_pc) { 39 ResizeBuffer(cnt + !!extra_top_pc); 40 internal_memcpy(trace_buffer, pcs, cnt * sizeof(trace_buffer[0])); 41 if (extra_top_pc) 42 trace_buffer[cnt] = extra_top_pc; 43 } 44 45 void VarSizeStackTrace::ReverseOrder() { 46 for (u32 i = 0; i < (size >> 1); i++) 47 Swap(trace_buffer[i], trace_buffer[size - 1 - i]); 48 } 49 50 } // namespace __tsan 51 52 #if !SANITIZER_GO 53 void __sanitizer::BufferedStackTrace::UnwindImpl( 54 uptr pc, uptr bp, void *context, bool request_fast, u32 max_depth) { 55 uptr top = 0; 56 uptr bottom = 0; 57 if (StackTrace::WillUseFastUnwind(request_fast)) { 58 GetThreadStackTopAndBottom(false, &top, &bottom); 59 Unwind(max_depth, pc, bp, nullptr, top, bottom, true); 60 } else 61 Unwind(max_depth, pc, 0, context, 0, 0, false); 62 } 63 #endif // SANITIZER_GO 64