forked from OSchip/llvm-project
68 lines
2.1 KiB
C++
68 lines
2.1 KiB
C++
//===-- 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/definitions.h"
|
|
#include "gwp_asan/optional/backtrace.h"
|
|
#include "gwp_asan/optional/printf.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::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 backtrace {
|
|
|
|
options::Backtrace_t getBacktraceFunction() { return Backtrace; }
|
|
PrintBacktrace_t getPrintBacktraceFunction() { return PrintBacktrace; }
|
|
SegvBacktrace_t getSegvBacktraceFunction() { return SegvBacktrace; }
|
|
|
|
} // namespace backtrace
|
|
} // namespace gwp_asan
|