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
70 lines
2.2 KiB
C++
70 lines
2.2 KiB
C++
//===-- backtrace_sanitizer_common.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 <stddef.h>
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
|
|
#include "gwp_asan/optional/backtrace.h"
|
|
#include "gwp_asan/options.h"
|
|
#include "sanitizer_common/sanitizer_stacktrace.h"
|
|
|
|
void __sanitizer::BufferedStackTrace::UnwindImpl(uptr pc, uptr bp,
|
|
void *context,
|
|
bool request_fast,
|
|
u32 max_depth) {
|
|
if (!StackTrace::WillUseFastUnwind(request_fast)) {
|
|
return Unwind(max_depth, pc, bp, context, 0, 0, request_fast);
|
|
}
|
|
Unwind(max_depth, pc, 0, context, 0, 0, false);
|
|
}
|
|
|
|
namespace {
|
|
void Backtrace(uintptr_t *TraceBuffer, size_t Size) {
|
|
__sanitizer::BufferedStackTrace Trace;
|
|
Trace.Reset();
|
|
if (Size > __sanitizer::kStackTraceMax)
|
|
Size = __sanitizer::kStackTraceMax;
|
|
|
|
Trace.Unwind((__sanitizer::uptr)__builtin_return_address(0),
|
|
(__sanitizer::uptr)__builtin_frame_address(0),
|
|
/* ucontext */ nullptr,
|
|
/* fast unwind */ true, Size - 1);
|
|
|
|
memcpy(TraceBuffer, Trace.trace, Trace.size * sizeof(uintptr_t));
|
|
TraceBuffer[Trace.size] = 0;
|
|
}
|
|
|
|
static void PrintBacktrace(uintptr_t *Trace,
|
|
gwp_asan::options::Printf_t Printf) {
|
|
__sanitizer::StackTrace StackTrace;
|
|
StackTrace.trace = reinterpret_cast<__sanitizer::uptr *>(Trace);
|
|
|
|
for (StackTrace.size = 0; StackTrace.size < __sanitizer::kStackTraceMax;
|
|
++StackTrace.size) {
|
|
if (Trace[StackTrace.size] == 0)
|
|
break;
|
|
}
|
|
|
|
if (StackTrace.size == 0) {
|
|
Printf(" <unknown (does your allocator support backtracing?)>\n\n");
|
|
return;
|
|
}
|
|
|
|
StackTrace.Print();
|
|
}
|
|
} // anonymous namespace
|
|
|
|
namespace gwp_asan {
|
|
namespace options {
|
|
Backtrace_t getBacktraceFunction() { return Backtrace; }
|
|
PrintBacktrace_t getPrintBacktraceFunction() { return PrintBacktrace; }
|
|
} // namespace options
|
|
} // namespace gwp_asan
|