// Copyright (c) 2017-2022, Lawrence Livermore National Security, LLC and
// other CEED contributors. All Rights Reserved.
// SPDX-License-Identifier: BSD-2-Clause

// Relocatable replacement for libCEED's installed JIT source-root object.
// Upstream normally compiles the installation prefix into libceed. Native
// source bundles here are shared libraries, so derive ../include from the
// loaded library instead. Emscripten has no runtime compiler/JIT filesystem.

#if defined(__EMSCRIPTEN__)

const char *CeedJitSourceRootDefault = "";

#else

#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif

#include <dlfcn.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>

#ifndef PATH_MAX
#define PATH_MAX 4096
#endif

static char ceed_jit_source_root[PATH_MAX];
const char *CeedJitSourceRootDefault = ceed_jit_source_root;

__attribute__((constructor)) static void CeedSetRelocatableJitSourceRoot(void) {
  Dl_info info;
  char library_path[PATH_MAX];

  if (!dladdr((void *)&CeedJitSourceRootDefault, &info) || !info.dli_fname) {
    return;
  }
  if (snprintf(library_path, sizeof library_path, "%s", info.dli_fname) < 0) {
    return;
  }
  char *separator = strrchr(library_path, '/');
  if (!separator) {
    return;
  }
  *separator = '\0';
  (void)snprintf(ceed_jit_source_root, sizeof ceed_jit_source_root,
                 "%s/../include/", library_path);
}

#endif