121 lines
3.0 KiB
C++
121 lines
3.0 KiB
C++
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// Copyright 2004-present Facebook. All Rights Reserved.
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#include <fb/lyra.h>
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#include <ios>
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#include <memory>
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#include <vector>
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#include <dlfcn.h>
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#include <unwind.h>
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using namespace std;
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namespace facebook {
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namespace lyra {
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namespace {
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class IosFlagsSaver {
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ios_base& ios_;
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ios_base::fmtflags flags_;
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public:
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IosFlagsSaver(ios_base& ios)
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: ios_(ios),
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flags_(ios.flags())
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{}
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~IosFlagsSaver() {
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ios_.flags(flags_);
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}
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};
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struct BacktraceState {
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size_t skip;
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vector<InstructionPointer>& stackTrace;
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};
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_Unwind_Reason_Code unwindCallback(struct _Unwind_Context* context, void* arg) {
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BacktraceState* state = reinterpret_cast<BacktraceState*>(arg);
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auto absoluteProgramCounter =
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reinterpret_cast<InstructionPointer>(_Unwind_GetIP(context));
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if (state->skip > 0) {
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--state->skip;
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return _URC_NO_REASON;
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}
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if (state->stackTrace.size() == state->stackTrace.capacity()) {
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return _URC_END_OF_STACK;
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}
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state->stackTrace.push_back(absoluteProgramCounter);
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return _URC_NO_REASON;
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}
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void captureBacktrace(size_t skip, vector<InstructionPointer>& stackTrace) {
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// Beware of a bug on some platforms, which makes the trace loop until the
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// buffer is full when it reaches a noexcept function. It seems to be fixed in
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// newer versions of gcc. https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56846
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// TODO(t10738439): Investigate workaround for the stack trace bug
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BacktraceState state = {skip, stackTrace};
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_Unwind_Backtrace(unwindCallback, &state);
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}
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}
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void getStackTrace(vector<InstructionPointer>& stackTrace, size_t skip) {
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stackTrace.clear();
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captureBacktrace(skip + 1, stackTrace);
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}
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// TODO(t10737622): Improve on-device symbolification
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void getStackTraceSymbols(vector<StackTraceElement>& symbols,
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const vector<InstructionPointer>& trace) {
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symbols.clear();
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symbols.reserve(trace.size());
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for (size_t i = 0; i < trace.size(); ++i) {
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Dl_info info;
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if (dladdr(trace[i], &info)) {
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symbols.emplace_back(trace[i], info.dli_fbase, info.dli_saddr,
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info.dli_fname ? info.dli_fname : "",
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info.dli_sname ? info.dli_sname : "");
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}
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}
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}
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ostream& operator<<(ostream& out, const StackTraceElement& elm) {
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IosFlagsSaver flags{out};
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// TODO(t10748683): Add build id to the output
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out << "{dso=" << elm.libraryName() << " offset=" << hex
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<< showbase << elm.libraryOffset();
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if (!elm.functionName().empty()) {
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out << " func=" << elm.functionName() << "()+" << elm.functionOffset();
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}
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out << " build-id=" << hex << setw(8) << 0
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<< "}";
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return out;
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}
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// TODO(t10737667): The implement a tool that parse the stack trace and
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// symbolicate it
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ostream& operator<<(ostream& out, const vector<StackTraceElement>& trace) {
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IosFlagsSaver flags{out};
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auto i = 0;
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out << "Backtrace:\n";
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for (auto& elm : trace) {
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out << " #" << dec << setfill('0') << setw(2) << i++ << " " << elm << '\n';
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}
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return out;
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}
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}
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}
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