7339ca278c
Summary: Adds two flavours of generic unwinder and all the supporting cruft. If the supporting allocator is okay with bringing in sanitizer_common, they can use the fast frame-pointer based unwinder from sanitizer_common. Otherwise, we also provide the backtrace() libc-based unwinder as well. Of course, the allocator can always specify its own unwinder and unwinder-symbolizer. The slightly changed output format is exemplified in the first comment on this patch. It now better incorporates backtrace information, and displays allocation details on the second line. Reviewers: eugenis, vlad.tsyrklevich Reviewed By: eugenis, vlad.tsyrklevich Subscribers: srhines, kubamracek, mgorny, cryptoad, #sanitizers, llvm-commits, morehouse Tags: #sanitizers, #llvm Differential Revision: https://reviews.llvm.org/D63841 llvm-svn: 364941
65 lines
2.0 KiB
C++
65 lines
2.0 KiB
C++
//===-- backtrace_linux_libc.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 <execinfo.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <stdlib.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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namespace {
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void Backtrace(uintptr_t *TraceBuffer, size_t Size) {
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// Grab (what seems to be) one more trace than we need. TraceBuffer needs to
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// be null-terminated, but we wish to remove the frame of this function call.
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static_assert(sizeof(uintptr_t) == sizeof(void *), "uintptr_t is not void*");
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int NumTraces =
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backtrace(reinterpret_cast<void **>(TraceBuffer), Size);
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// Now shift the entire trace one place to the left and null-terminate.
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memmove(TraceBuffer, TraceBuffer + 1, NumTraces * sizeof(void *));
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TraceBuffer[NumTraces - 1] = 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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size_t NumTraces = 0;
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for (; Trace[NumTraces] != 0; ++NumTraces) {
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}
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if (NumTraces == 0) {
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Printf(" <not found (does your allocator support backtracing?)>\n\n");
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return;
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}
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char **BacktraceSymbols =
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backtrace_symbols(reinterpret_cast<void **>(Trace), NumTraces);
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for (size_t i = 0; i < NumTraces; ++i) {
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if (!BacktraceSymbols)
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Printf(" #%zu %p\n", i, Trace[i]);
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else
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Printf(" #%zu %s\n", i, BacktraceSymbols[i]);
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}
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Printf("\n");
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if (BacktraceSymbols)
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free(BacktraceSymbols);
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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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