backtrace_linux_libc.cpp
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//===-- backtrace_linux_libc.cpp --------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include <assert.h>
#include <execinfo.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include "gwp_asan/optional/backtrace.h"
#include "gwp_asan/options.h"
namespace {
size_t Backtrace(uintptr_t *TraceBuffer, size_t Size) {
static_assert(sizeof(uintptr_t) == sizeof(void *), "uintptr_t is not void*");
return backtrace(reinterpret_cast<void **>(TraceBuffer), Size);
}
// We don't need any custom handling for the Segv backtrace - the libc unwinder
// has no problems with unwinding through a signal handler. Force inlining here
// to avoid the additional frame.
GWP_ASAN_ALWAYS_INLINE size_t SegvBacktrace(uintptr_t *TraceBuffer, size_t Size,
void * /*Context*/) {
return Backtrace(TraceBuffer, Size);
}
static void PrintBacktrace(uintptr_t *Trace, size_t TraceLength,
gwp_asan::crash_handler::Printf_t Printf) {
if (TraceLength == 0) {
Printf(" <not found (does your allocator support backtracing?)>\n\n");
return;
}
char **BacktraceSymbols =
backtrace_symbols(reinterpret_cast<void **>(Trace), TraceLength);
for (size_t i = 0; i < TraceLength; ++i) {
if (!BacktraceSymbols)
Printf(" #%zu %p\n", i, Trace[i]);
else
Printf(" #%zu %s\n", i, BacktraceSymbols[i]);
}
Printf("\n");
if (BacktraceSymbols)
free(BacktraceSymbols);
}
} // anonymous namespace
namespace gwp_asan {
namespace options {
Backtrace_t getBacktraceFunction() { return Backtrace; }
crash_handler::PrintBacktrace_t getPrintBacktraceFunction() {
return PrintBacktrace;
}
} // namespace options
namespace crash_handler {
SegvBacktrace_t getSegvBacktraceFunction() { return SegvBacktrace; }
} // namespace crash_handler
} // namespace gwp_asan