#ifdef CPPTRACE_UNWIND_WITH_EXECINFO

#include "unwind.hpp"

#include "../platform/common.hpp"

#include "../platform/utils.hpp"

#include <algorithm>

#include <cstddef>

#include <vector>

#include <execinfo.h>

namespace cpptrace {

namespace detail {

CPPTRACE_FORCE_NO_INLINE

std::vector<std::uintptr_t> capture_frames(std::size_t skip, std::size_t max_depth) {

skip++;

std::vector<void*> addrs(std::min(hard_max_frames, skip + max_depth), nullptr);

const int n_frames = backtrace(addrs.data(), static_cast<int>(addrs.size())); // thread safe

// I hate the copy here but it's the only way that isn't UB

std::vector<std::uintptr_t> frames(n_frames - skip, 0);

for(int i = skip; i < n_frames; i++) {

// On x86/x64/arm, as far as I can tell, the frame return address is always one after the call

// So we just decrement to get the pc back inside the `call` / `bl`

// This is done with _Unwind too but conditionally based on info from _Unwind_GetIPInfo.

frames[i - skip] = reinterpret_cast<std::uintptr_t>(addrs[i]) - 1;

}

return frames;

}

}

}

#endif