Function resolve_dynamic_module_path

src/builtin/module_jit.cpp:1332–1355

Pure resolution: pick the path to load, in priority order: 1. / — daspkg release bundle layout (modules sit next to the exe) 2. / — SDK install layout AND local dev build 3. — baked-at-codegen absolute path (legacy / paths without /modules/ segment) Tiers 1+2 are skipped when rel_path is empty/null. Returns the chosen path; tier 3 i

// Tiers 1+2 are skipped when rel_path is empty/null. Returns the chosen path;
// tier 3 is unconditional, so the result is never empty when fallback is set.
static das::string resolve_dynamic_module_path ( const char * rel_path, const char * fallback_abs_path ) {
    namespace fs = std::filesystem;
    // tier 1 — exe_dir (parent_path correctly preserves filesystem root: "/myapp" → "/", "C:\myapp.exe" → "C:\")
    das::string exeFile;
    if ( g_jit_exe_file_for_test ) {
        const char * s = g_jit_exe_file_for_test();
        if ( s ) exeFile = s;
    } else {
        exeFile = das::getExecutableFileName();
    }
    if ( !exeFile.empty() ) {
        fs::path exeDir = fs::path(exeFile.c_str()).parent_path();
        if ( exeDir.empty() ) exeDir = ".";  // exe is a bare filename relative to cwd
        das::string p = pick_at_dir(exeDir, rel_path);
        if ( !p.empty() ) return p;
    }
    // tier 2 — das_root
    {
        das::string p = pick_at_dir(fs::path(das::getDasRoot().c_str()), rel_path);
        if ( !p.empty() ) return p;
    }
    // tier 3 — baked absolute (legacy fallback)
    return fallback_abs_path ? fallback_abs_path : "";
}
#else
// No file IO (DAS_NO_FILEIO): there is no filesystem to resolve a dynamic
// module against, and a build with no fio can't dlopen one anyway. Calling