1 //===-- backtrace_linux_libc.cpp --------------------------------*- C++ -*-===// 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 #include <assert.h> 10 #include <execinfo.h> 11 #include <stddef.h> 12 #include <stdint.h> 13 #include <stdlib.h> 14 #include <string.h> 15 16 #include "gwp_asan/optional/backtrace.h" 17 #include "gwp_asan/options.h" 18 19 namespace { 20 size_t Backtrace(uintptr_t *TraceBuffer, size_t Size) { 21 static_assert(sizeof(uintptr_t) == sizeof(void *), "uintptr_t is not void*"); 22 23 return backtrace(reinterpret_cast<void **>(TraceBuffer), Size); 24 } 25 26 static void PrintBacktrace(uintptr_t *Trace, size_t TraceLength, 27 gwp_asan::options::Printf_t Printf) { 28 if (TraceLength == 0) { 29 Printf(" <not found (does your allocator support backtracing?)>\n\n"); 30 return; 31 } 32 33 char **BacktraceSymbols = 34 backtrace_symbols(reinterpret_cast<void **>(Trace), TraceLength); 35 36 for (size_t i = 0; i < TraceLength; ++i) { 37 if (!BacktraceSymbols) 38 Printf(" #%zu %p\n", i, Trace[i]); 39 else 40 Printf(" #%zu %s\n", i, BacktraceSymbols[i]); 41 } 42 43 Printf("\n"); 44 if (BacktraceSymbols) 45 free(BacktraceSymbols); 46 } 47 } // anonymous namespace 48 49 namespace gwp_asan { 50 namespace options { 51 Backtrace_t getBacktraceFunction() { return Backtrace; } 52 PrintBacktrace_t getPrintBacktraceFunction() { return PrintBacktrace; } 53 } // namespace options 54 } // namespace gwp_asan 55