129 lines
3.0 KiB
C++
129 lines
3.0 KiB
C++
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#include "./stacktrace.hpp"
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#include <optional>
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#include <string>
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#include <backtrace.h>
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#include "../detect.hpp"
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namespace mijin
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{
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namespace
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{
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//
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// internal defines
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//
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//
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// internal constants
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//
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//
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// internal types
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//
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struct BacktraceData
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{
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std::optional<std::string> error;
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std::vector<Stackframe> stackframes;
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};
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//
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// internal variables
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//
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thread_local Optional<Stacktrace> gCurrentExceptionStackTrace;
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//
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// internal functions
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//
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int backtraceFullCallback(void* data, std::uintptr_t programCounter, const char* filename, int lineno, const char* function)
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{
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BacktraceData& btData = *static_cast<BacktraceData*>(data);
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btData.stackframes.push_back({
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.address = reinterpret_cast<void*>(programCounter),
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.filename = filename ? filename : "<unknown>",
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.function = function ? function : "<unknown>",
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.lineNumber = lineno
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});
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return 0;
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}
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void backtraceErrorCallback(void* data, const char* msg, int /* errnum */)
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{
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BacktraceData& btData = *static_cast<BacktraceData*>(data);
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btData.error = msg;
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}
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thread_local backtrace_state* gBacktraceState = nullptr;
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} // namespace
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//
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// public functions
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//
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Result<Stacktrace> captureStacktrace(unsigned skipFrames) noexcept
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{
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BacktraceData btData;
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if (gBacktraceState == nullptr)
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{
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gBacktraceState = backtrace_create_state(/*filename = */ nullptr, /* threaded = */ false, &backtraceErrorCallback, &btData);
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}
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if (btData.error.has_value())
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{
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return ResultError(std::move(*btData.error));
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}
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if (gBacktraceState == nullptr)
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{
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return ResultError("Error initializing libbacktrace.");
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}
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backtrace_full(gBacktraceState, static_cast<int>(skipFrames) + 1, &backtraceFullCallback, &backtraceErrorCallback, &btData);
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if (btData.error.has_value())
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{
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return ResultError(std::move(*btData.error));
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}
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return Stacktrace(std::move(btData.stackframes));
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}
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const Optional<Stacktrace>& getExceptionStacktrace() noexcept
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{
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return gCurrentExceptionStackTrace;
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}
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} // namespace mijin
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#if MIJIN_STDLIB == MIJIN_STDLIB_GLIBC
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#include <dlfcn.h>
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namespace
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{
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using cxa_throw_type = void (*)(void*, std::type_info*, void(*)(void*));
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using cxa_rethrow_type = void (*)();
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cxa_throw_type orig_cxa_throw = nullptr; // Address of the original __cxa_throw
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// cxa_rethrow_type orig_cxa_rethrow = nullptr; // Address of the original __cxa_rethrow
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extern "C" void __cxa_throw(void* thrown_exception, std::type_info* tinfo, void (*dest)(void*))
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{
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if (!orig_cxa_throw) {
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orig_cxa_throw = reinterpret_cast<cxa_throw_type>(dlsym(RTLD_NEXT, "__cxa_throw"));
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}
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if (mijin::Result<mijin::Stacktrace> stacktrace = mijin::captureStacktrace(); stacktrace.isSuccess())
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{
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mijin::gCurrentExceptionStackTrace = std::move(*stacktrace);
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}
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else
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{
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mijin::gCurrentExceptionStackTrace.reset();
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}
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if (orig_cxa_throw) {
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orig_cxa_throw(thrown_exception, tinfo, dest);
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}
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else {
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std::abort();
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}
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}
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}
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#endif
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