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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 {
void Backtrace(uintptr_t *TraceBuffer, size_t Size) {
// Grab (what seems to be) one more trace than we need. TraceBuffer needs to
// be null-terminated, but we wish to remove the frame of this function call.
static_assert(sizeof(uintptr_t) == sizeof(void *), "uintptr_t is not void*");
int NumTraces =
backtrace(reinterpret_cast<void **>(TraceBuffer), Size);
// Now shift the entire trace one place to the left and null-terminate.
memmove(TraceBuffer, TraceBuffer + 1, NumTraces * sizeof(void *));
TraceBuffer[NumTraces - 1] = 0;
}
static void PrintBacktrace(uintptr_t *Trace,
gwp_asan::options::Printf_t Printf) {
size_t NumTraces = 0;
for (; Trace[NumTraces] != 0; ++NumTraces) {
}
if (NumTraces == 0) {
Printf(" <not found (does your allocator support backtracing?)>\n\n");
return;
}
char **BacktraceSymbols =
backtrace_symbols(reinterpret_cast<void **>(Trace), NumTraces);
for (size_t i = 0; i < NumTraces; ++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; }
PrintBacktrace_t getPrintBacktraceFunction() { return PrintBacktrace; }
} // namespace options
} // namespace gwp_asan
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