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* Copyright (c) 2018, Hobu Inc. (info@hobu.co)
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#include "BacktraceImpl.hpp"

#include <string>

#define UNW_LOCAL_ONLY
#include <dlfcn.h>
#include <libunwind.h>

namespace pdal
{

Utils::BacktraceEntries Utils::backtraceImpl()
{
    BacktraceEntries entries;

    unw_cursor_t cursor;
    unw_context_t context;

    unw_getcontext(&context);
    unw_init_local(&cursor, &context);

    while (unw_step(&cursor) > 0)
    {
        unw_word_t val;
        BacktraceEntry entry;

        unw_get_reg(&cursor, UNW_REG_IP, &val);
        if (val == 0)
            break;
        entry.addr = reinterpret_cast<void *>(val);

        unw_word_t offset;
        char sym[1000];
        if (unw_get_proc_name(&cursor, sym, sizeof(sym), &offset) == 0)
        {
            entry.offset = (int)offset;
            entry.symname = sym;
        }
        Dl_info info;
        if (dladdr(entry.addr, &info))
            entry.libname = info.dli_fname;
        entries.push_back(entry);
    }
    return entries;
}

} // namespace pdal
