Function locate_source_file

src/debug.cpp:210–244

* Try to locate the source file for the given address. * If addr2line is not available on the system, the operation simply returns * an string "unknown location(address)". */

 * an string "unknown location(address)".
 */
addr2line_result locate_source_file(const demangling_result& dr)
{
    auto executable = locate_executable(dr.executable);

    if (executable.empty() || dr.address.empty())
    {
        return {"", ""};
    }

    // First, try to check a symbol in the executable
    auto in_executable = try_addr2line(executable, dr.address);
    if (valid_addr2line_return(in_executable))
    {
        auto function_name = try_addr2line(executable, dr.address, "-Cf");

        return {function_name, in_executable};
    }

    // Second, try to check a symbol in a library
    // We need the base address inside the library.
    Dl_info info;
    dladdr(hex_to_ptr(dr.address), &info);

    void *position_inside_lib = reinterpret_cast<void*>(
        (char*)hex_to_ptr(dr.address) - (char*)info.dli_fbase);

    std::ostringstream out;
    out << std::hex << position_inside_lib;
    std::string real_address = out.str();

    return {
        try_addr2line(executable, real_address, "-Cf"),
        try_addr2line(executable, real_address),
    };
}

    #if HAS_ASAN
extern "C"