forked from OSchip/llvm-project
70 lines
2.2 KiB
C++
70 lines
2.2 KiB
C++
//===-- backtrace_sanitizer_common.cpp --------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include <assert.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <string.h>
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#include "gwp_asan/optional/backtrace.h"
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#include "gwp_asan/options.h"
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#include "sanitizer_common/sanitizer_stacktrace.h"
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void __sanitizer::BufferedStackTrace::UnwindImpl(uptr pc, uptr bp,
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void *context,
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bool request_fast,
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u32 max_depth) {
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if (!StackTrace::WillUseFastUnwind(request_fast)) {
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return Unwind(max_depth, pc, bp, context, 0, 0, request_fast);
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}
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Unwind(max_depth, pc, 0, context, 0, 0, false);
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}
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namespace {
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void Backtrace(uintptr_t *TraceBuffer, size_t Size) {
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__sanitizer::BufferedStackTrace Trace;
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Trace.Reset();
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if (Size > __sanitizer::kStackTraceMax)
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Size = __sanitizer::kStackTraceMax;
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Trace.Unwind((__sanitizer::uptr)__builtin_return_address(0),
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(__sanitizer::uptr)__builtin_frame_address(0),
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/* ucontext */ nullptr,
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/* fast unwind */ true, Size - 1);
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memcpy(TraceBuffer, Trace.trace, Trace.size * sizeof(uintptr_t));
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TraceBuffer[Trace.size] = 0;
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}
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static void PrintBacktrace(uintptr_t *Trace,
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gwp_asan::options::Printf_t Printf) {
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__sanitizer::StackTrace StackTrace;
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StackTrace.trace = reinterpret_cast<__sanitizer::uptr *>(Trace);
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for (StackTrace.size = 0; StackTrace.size < __sanitizer::kStackTraceMax;
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++StackTrace.size) {
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if (Trace[StackTrace.size] == 0)
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break;
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}
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if (StackTrace.size == 0) {
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Printf(" <unknown (does your allocator support backtracing?)>\n\n");
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return;
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}
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StackTrace.Print();
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}
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} // anonymous namespace
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namespace gwp_asan {
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namespace options {
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Backtrace_t getBacktraceFunction() { return Backtrace; }
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PrintBacktrace_t getPrintBacktraceFunction() { return PrintBacktrace; }
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} // namespace options
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} // namespace gwp_asan
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