1 //===-- backtrace_sanitizer_common.cpp --------------------------*- C++ -*-===//
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
7 //===----------------------------------------------------------------------===//
14 #include "gwp_asan/optional/backtrace.h"
15 #include "gwp_asan/options.h"
16 #include "sanitizer_common/sanitizer_stacktrace.h"
18 void __sanitizer::BufferedStackTrace::UnwindImpl(uptr pc, uptr bp,
22 if (!StackTrace::WillUseFastUnwind(request_fast)) {
23 return Unwind(max_depth, pc, bp, context, 0, 0, request_fast);
25 Unwind(max_depth, pc, 0, context, 0, 0, false);
29 void Backtrace(uintptr_t *TraceBuffer, size_t Size) {
30 __sanitizer::BufferedStackTrace Trace;
32 if (Size > __sanitizer::kStackTraceMax)
33 Size = __sanitizer::kStackTraceMax;
35 Trace.Unwind((__sanitizer::uptr)__builtin_return_address(0),
36 (__sanitizer::uptr)__builtin_frame_address(0),
37 /* ucontext */ nullptr,
38 /* fast unwind */ true, Size - 1);
40 memcpy(TraceBuffer, Trace.trace, Trace.size * sizeof(uintptr_t));
41 TraceBuffer[Trace.size] = 0;
44 static void PrintBacktrace(uintptr_t *Trace,
45 gwp_asan::options::Printf_t Printf) {
46 __sanitizer::StackTrace StackTrace;
47 StackTrace.trace = reinterpret_cast<__sanitizer::uptr *>(Trace);
49 for (StackTrace.size = 0; StackTrace.size < __sanitizer::kStackTraceMax;
51 if (Trace[StackTrace.size] == 0)
55 if (StackTrace.size == 0) {
56 Printf(" <unknown (does your allocator support backtracing?)>\n\n");
62 } // anonymous namespace
66 Backtrace_t getBacktraceFunction() { return Backtrace; }
67 PrintBacktrace_t getPrintBacktraceFunction() { return PrintBacktrace; }
68 } // namespace options
69 } // namespace gwp_asan