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Stack traces in std::exception (experimental) #1

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alexey-milovidov merged 3 commits into from
Jan 2, 2020
Merged

Stack traces in std::exception (experimental) #1

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a7b9ecc
Stack traces in std::exception
alexey-milovidov Jan 2, 2020
339dbe5
Addition to prev. revision
alexey-milovidov Jan 2, 2020
a8c4533
Fixed comment
alexey-milovidov Jan 2, 2020
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31 changes: 30 additions & 1 deletion include/exception
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Original file line number Diff line number Diff line change
Expand Up @@ -90,16 +90,45 @@ template <class E> void rethrow_if_nested(const E& e);
#pragma GCC system_header
#endif

#ifdef STD_EXCEPTION_HAS_STACK_TRACE
extern "C" int unw_backtrace(void **, int);
#endif

namespace std // purposefully not using versioning namespace
{

#if !defined(_LIBCPP_ABI_VCRUNTIME)
class _LIBCPP_EXCEPTION_ABI exception
{
public:
_LIBCPP_INLINE_VISIBILITY exception() _NOEXCEPT {}
_LIBCPP_INLINE_VISIBILITY exception() _NOEXCEPT
{
#ifdef STD_EXCEPTION_HAS_STACK_TRACE
capture();
#endif
}
virtual ~exception() _NOEXCEPT;
virtual const char* what() const _NOEXCEPT;
#ifdef STD_EXCEPTION_HAS_STACK_TRACE
/// This is ClickHouse patch to libc++. It breaks ABI, so you cannot link your code with any C++ library
/// that has any std::exception-related symbols exported and was built without this patch.
void ** const get_stack_trace_frames() const _NOEXCEPT { return const_cast<void**>(frames); }
int get_stack_trace_size() const _NOEXCEPT { return size; }
void set_stack_trace(void ** frames_, int size_) _NOEXCEPT
{
size = size_;
for (int i = 0; i < size; ++i)
frames[i] = frames_[i];
}
private:
static constexpr int capacity = 32;
void * frames[capacity];
int size = 0;
void capture() _NOEXCEPT
{
size = unw_backtrace(frames, capacity);
}
#endif
};

class _LIBCPP_EXCEPTION_ABI bad_exception
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