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/* Test GNU Emacs modules.

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Copyright 2015-2020 Free Software Foundation, Inc.
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This file is part of GNU Emacs.

GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or (at
your option) any later version.
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GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
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along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.  */
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#include "config.h"

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#undef NDEBUG
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#include <assert.h>
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#include <errno.h>
#include <limits.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
#include <time.h>

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#ifdef WINDOWSNT
/* Cannot include <process.h> because of the local header by the same
   name, sigh.  */
uintptr_t _beginthread (void (__cdecl *)(void *), unsigned, void *);
# if !defined __x86_64__
#  define ALIGN_STACK __attribute__((force_align_arg_pointer))
# endif
# include <windows.h>	/* for Sleep */
#else  /* !WINDOWSNT */
# include <pthread.h>
# include <unistd.h>
#endif
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#include <gmp.h>
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#include <emacs-module.h>
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#include "timespec.h"

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int plugin_is_GPL_compatible;

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#if INTPTR_MAX <= 0
# error "INTPTR_MAX misconfigured"
#elif INTPTR_MAX <= INT_MAX || INTPTR_MAX <= LONG_MAX
# define pT "ld"
# define pZ "lu"
# define T_TYPE long
# define Z_TYPE unsigned long
#elif INTPTR_MAX <= INT64_MAX
# ifdef __MINGW32__
#  define pT "lld"
#  define pZ "llu"
#  define T_TYPE long long
#  define Z_TYPE unsigned long long
# else
#  define pT "ld"
#  define pZ "lu"
#  define T_TYPE long
#  define Z_TYPE unsigned long
# endif
#else
# error "INTPTR_MAX too large"
#endif

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/* Smoke test to verify that EMACS_LIMB_MAX is defined. */
_Static_assert (0 < EMACS_LIMB_MAX, "EMACS_LIMB_MAX missing or incorrect");
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/* Always return symbol 't'.  */
static emacs_value
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Fmod_test_return_t (emacs_env *env, ptrdiff_t nargs, emacs_value args[],
		    void *data)
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{
  return env->intern (env, "t");
}

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/* Expose simple sum function.  */
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static intmax_t
sum (intmax_t a, intmax_t b)
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{
  return a + b;
}

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static emacs_value
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Fmod_test_sum (emacs_env *env, ptrdiff_t nargs, emacs_value args[], void *data)
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{
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  assert (nargs == 2);
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  assert ((uintptr_t) data == 0x1234);
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  intmax_t a = env->extract_integer (env, args[0]);
  intmax_t b = env->extract_integer (env, args[1]);
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  intmax_t r = sum (a, b);
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  return env->make_integer (env, r);
}


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/* Signal '(error 56).  */
static emacs_value
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Fmod_test_signal (emacs_env *env, ptrdiff_t nargs, emacs_value args[],
		  void *data)
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{
  assert (env->non_local_exit_check (env) == emacs_funcall_exit_return);
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  env->non_local_exit_signal (env, env->intern (env, "error"),
			      env->make_integer (env, 56));
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  return NULL;
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}


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/* Throw '(tag 65).  */
static emacs_value
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Fmod_test_throw (emacs_env *env, ptrdiff_t nargs, emacs_value args[],
		 void *data)
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{
  assert (env->non_local_exit_check (env) == emacs_funcall_exit_return);
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  env->non_local_exit_throw (env, env->intern (env, "tag"),
			     env->make_integer (env, 65));
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  return NULL;
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}


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/* Call argument function, catch all non-local exists and return
   either normal result or a list describing the non-local exit.  */
static emacs_value
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Fmod_test_non_local_exit_funcall (emacs_env *env, ptrdiff_t nargs,
				  emacs_value args[], void *data)
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{
  assert (nargs == 1);
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  emacs_value result = env->funcall (env, args[0], 0, NULL);
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  emacs_value non_local_exit_symbol, non_local_exit_data;
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  enum emacs_funcall_exit code
    = env->non_local_exit_get (env, &non_local_exit_symbol,
			       &non_local_exit_data);
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  switch (code)
    {
    case emacs_funcall_exit_return:
      return result;
    case emacs_funcall_exit_signal:
      {
        env->non_local_exit_clear (env);
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        emacs_value Flist = env->intern (env, "list");
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        emacs_value list_args[] = {env->intern (env, "signal"),
				   non_local_exit_symbol, non_local_exit_data};
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        return env->funcall (env, Flist, 3, list_args);
      }
    case emacs_funcall_exit_throw:
      {
        env->non_local_exit_clear (env);
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        emacs_value Flist = env->intern (env, "list");
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        emacs_value list_args[] = {env->intern (env, "throw"),
				   non_local_exit_symbol, non_local_exit_data};
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        return env->funcall (env, Flist, 3, list_args);
      }
    }
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  /* Never reached.  */
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  return env->intern (env, "nil");;
}


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/* Return a global reference.  */
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static emacs_value
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Fmod_test_globref_make (emacs_env *env, ptrdiff_t nargs, emacs_value args[],
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			void *data)
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{
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  /* Make a big string and make it global.  */
  char str[26 * 100];
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  for (int i = 0; i < sizeof str; i++)
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    str[i] = 'a' + (i % 26);
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  /* We don't need to null-terminate str.  */
  emacs_value lisp_str = env->make_string (env, str, sizeof str);
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  return env->make_global_ref (env, lisp_str);
}

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/* Create a few global references from arguments and free them.  */
static emacs_value
Fmod_test_globref_free (emacs_env *env, ptrdiff_t nargs, emacs_value args[],
			void *data)
{
  emacs_value refs[10];
  for (int i = 0; i < 10; i++)
    {
      refs[i] = env->make_global_ref (env, args[i % nargs]);
    }
  for (int i = 0; i < 10; i++)
    {
      env->free_global_ref (env, refs[i]);
    }
  return env->intern (env, "ok");
}


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/* Return a copy of the argument string where every 'a' is replaced
   with 'b'.  */
static emacs_value
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Fmod_test_string_a_to_b (emacs_env *env, ptrdiff_t nargs, emacs_value args[],
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			 void *data)
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{
  emacs_value lisp_str = args[0];
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  ptrdiff_t size = 0;
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  char * buf = NULL;

  env->copy_string_contents (env, lisp_str, buf, &size);
  buf = malloc (size);
  env->copy_string_contents (env, lisp_str, buf, &size);

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  for (ptrdiff_t i = 0; i + 1 < size; i++)
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    if (buf[i] == 'a')
      buf[i] = 'b';

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  return env->make_string (env, buf, size - 1);
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}


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/* Embedded pointers in lisp objects.  */
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/* C struct (pointer to) that will be embedded.  */
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struct super_struct
{
  int amazing_int;
  char large_unused_buffer[512];
};

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/* Return a new user-pointer to a super_struct, with amazing_int set
   to the passed parameter.  */
static emacs_value
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Fmod_test_userptr_make (emacs_env *env, ptrdiff_t nargs, emacs_value args[],
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			void *data)
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{
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  struct super_struct *p = calloc (1, sizeof *p);
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  p->amazing_int = env->extract_integer (env, args[0]);
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  return env->make_user_ptr (env, free, p);
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}

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/* Return the amazing_int of a passed 'user-pointer to a super_struct'.  */
static emacs_value
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Fmod_test_userptr_get (emacs_env *env, ptrdiff_t nargs, emacs_value args[],
		       void *data)
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{
  struct super_struct *p = env->get_user_ptr (env, args[0]);
  return env->make_integer (env, p->amazing_int);
}


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/* Fill vector in args[0] with value in args[1].  */
static emacs_value
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Fmod_test_vector_fill (emacs_env *env, ptrdiff_t nargs, emacs_value args[],
		       void *data)
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{
  emacs_value vec = args[0];
  emacs_value val = args[1];
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  ptrdiff_t size = env->vec_size (env, vec);
  for (ptrdiff_t i = 0; i < size; i++)
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    env->vec_set (env, vec, i, val);
  return env->intern (env, "t");
}


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/* Return whether all elements of vector in args[0] are 'eq' to value
   in args[1].  */
static emacs_value
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Fmod_test_vector_eq (emacs_env *env, ptrdiff_t nargs, emacs_value args[],
		     void *data)
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{
  emacs_value vec = args[0];
  emacs_value val = args[1];
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  ptrdiff_t size = env->vec_size (env, vec);
  for (ptrdiff_t i = 0; i < size; i++)
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    if (!env->eq (env, env->vec_get (env, vec, i), val))
        return env->intern (env, "nil");
  return env->intern (env, "t");
}

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static emacs_value invalid_stored_value;

/* The next two functions perform a possibly-invalid operation: they
   store a value in a static variable and load it.  This causes
   undefined behavior if the environment that the value was created
   from is no longer live.  The module assertions check for this
   error.  */

static emacs_value
Fmod_test_invalid_store (emacs_env *env, ptrdiff_t nargs, emacs_value *args,
                         void *data)
{
  return invalid_stored_value = env->make_integer (env, 123);
}

static emacs_value
Fmod_test_invalid_load (emacs_env *env, ptrdiff_t nargs, emacs_value *args,
                        void *data)
{
  return invalid_stored_value;
}

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/* The next function works in conjunction with the two previous ones.
   It stows away a copy of the object created by
   `Fmod_test_invalid_store' in a global reference.  Module assertions
   should still detect the invalid load of the local reference.  */

static emacs_value global_copy_of_invalid_stored_value;

static emacs_value
Fmod_test_invalid_store_copy (emacs_env *env, ptrdiff_t nargs,
                              emacs_value *args, void *data)
{
  emacs_value local = Fmod_test_invalid_store (env, 0, NULL, NULL);
  return global_copy_of_invalid_stored_value
         = env->make_global_ref (env, local);
}

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/* An invalid finalizer: Finalizers are run during garbage collection,
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   where Lisp code can't be executed.  -module-assertions tests for
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   this case.  */

static emacs_env *current_env;

static void
invalid_finalizer (void *ptr)
{
  current_env->intern (current_env, "nil");
}

static emacs_value
Fmod_test_invalid_finalizer (emacs_env *env, ptrdiff_t nargs, emacs_value *args,
                             void *data)
{
  current_env = env;
  env->make_user_ptr (env, invalid_finalizer, NULL);
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  return env->intern (env, "nil");
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}

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static void
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signal_system_error (emacs_env *env, int error, const char *function)
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{
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  const char *message = strerror (error);
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  emacs_value message_value = env->make_string (env, message, strlen (message));
  emacs_value symbol = env->intern (env, "file-error");
  emacs_value elements[2]
    = {env->make_string (env, function, strlen (function)), message_value};
  emacs_value data = env->funcall (env, env->intern (env, "list"), 2, elements);
  env->non_local_exit_signal (env, symbol, data);
}

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static void
signal_errno (emacs_env *env, const char *function)
{
  signal_system_error (env, errno, function);
}

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/* A long-running operation that occasionally calls `should_quit' or
   `process_input'.  */

static emacs_value
Fmod_test_sleep_until (emacs_env *env, ptrdiff_t nargs, emacs_value *args,
                       void *data)
{
  assert (nargs == 2);
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  const struct timespec until = env->extract_time (env, args[0]);
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  if (env->non_local_exit_check (env))
    return NULL;
  const bool process_input = env->is_not_nil (env, args[1]);
  const struct timespec amount = make_timespec(0,  10000000);
  while (true)
    {
      const struct timespec now = current_timespec ();
      if (timespec_cmp (now, until) >= 0)
        break;
      if (nanosleep (&amount, NULL) && errno != EINTR)
        {
          signal_errno (env, "nanosleep");
          return NULL;
        }
      if ((process_input
           && env->process_input (env) == emacs_process_input_quit)
          || env->should_quit (env))
        return NULL;
    }
  return env->intern (env, "finished");
}
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static emacs_value
Fmod_test_add_nanosecond (emacs_env *env, ptrdiff_t nargs, emacs_value *args,
                          void *data)
{
  assert (nargs == 1);
  struct timespec time = env->extract_time (env, args[0]);
  assert (time.tv_nsec >= 0);
  assert (time.tv_nsec < 2000000000);  /* possible leap second */
  time.tv_nsec++;
  return env->make_time (env, time);
}

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static void
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signal_error (emacs_env *env, const char *message)
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{
  emacs_value data = env->make_string (env, message, strlen (message));
  env->non_local_exit_signal (env, env->intern (env, "error"),
                              env->funcall (env, env->intern (env, "list"), 1,
                                            &data));
}

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static void
memory_full (emacs_env *env)
{
  signal_error (env, "Memory exhausted");
}

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enum
{
  max_count = ((SIZE_MAX < PTRDIFF_MAX ? SIZE_MAX : PTRDIFF_MAX)
               / sizeof (emacs_limb_t))
};

static bool
extract_big_integer (emacs_env *env, emacs_value arg, mpz_t result)
{
  int sign;
  ptrdiff_t count;
  bool success = env->extract_big_integer (env, arg, &sign, &count, NULL);
  if (!success)
    return false;
  if (sign == 0)
    {
      mpz_set_ui (result, 0);
      return true;
    }
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  enum { order = -1, size = sizeof (emacs_limb_t), endian = 0, nails = 0 };
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  assert (0 < count && count <= max_count);
  emacs_limb_t *magnitude = malloc (count * size);
  if (magnitude == NULL)
    {
      memory_full (env);
      return false;
    }
  success = env->extract_big_integer (env, arg, NULL, &count, magnitude);
  assert (success);
  mpz_import (result, count, order, size, endian, nails, magnitude);
  free (magnitude);
  if (sign < 0)
    mpz_neg (result, result);
  return true;
}

static emacs_value
make_big_integer (emacs_env *env, const mpz_t value)
{
  if (mpz_sgn (value) == 0)
    return env->make_integer (env, 0);
  /* See
     https://gmplib.org/manual/Integer-Import-and-Export.html#index-Export. */
  enum
  {
    order = -1,
    size = sizeof (emacs_limb_t),
    endian = 0,
    nails = 0,
    numb = 8 * size - nails
  };
  size_t count = (mpz_sizeinbase (value, 2) + numb - 1) / numb;
  if (max_count < count)
    {
      memory_full (env);
      return NULL;
    }
  emacs_limb_t *magnitude = malloc (count * size);
  if (magnitude == NULL)
    {
      memory_full (env);
      return NULL;
    }
  size_t written;
  mpz_export (magnitude, &written, order, size, endian, nails, value);
  assert (written == count);
  assert (count <= PTRDIFF_MAX);
  emacs_value result = env->make_big_integer (env, mpz_sgn (value),
                                              (ptrdiff_t) count, magnitude);
  free (magnitude);
  return result;
}

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static emacs_value
Fmod_test_nanoseconds (emacs_env *env, ptrdiff_t nargs, emacs_value *args, void *data) {
  assert (nargs == 1);
  struct timespec time = env->extract_time (env, args[0]);
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  mpz_t nanoseconds;
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  assert (LONG_MIN <= time.tv_sec && time.tv_sec <= LONG_MAX);
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  mpz_init_set_si (nanoseconds, time.tv_sec);
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#ifdef __MINGW32__
  _Static_assert (1000000000 <= ULONG_MAX, "unsupported architecture");
#else
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  static_assert (1000000000 <= ULONG_MAX, "unsupported architecture");
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#endif
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  mpz_mul_ui (nanoseconds, nanoseconds, 1000000000);
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  assert (0 <= time.tv_nsec && time.tv_nsec <= ULONG_MAX);
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  mpz_add_ui (nanoseconds, nanoseconds, time.tv_nsec);
  emacs_value result = make_big_integer (env, nanoseconds);
  mpz_clear (nanoseconds);
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  return result;
}

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static emacs_value
Fmod_test_double (emacs_env *env, ptrdiff_t nargs, emacs_value *args,
                  void *data)
{
  assert (nargs == 1);
  emacs_value arg = args[0];
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  mpz_t value;
  mpz_init (value);
  extract_big_integer (env, arg, value);
  mpz_mul_ui (value, value, 2);
  emacs_value result = make_big_integer (env, value);
  mpz_clear (value);
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  return result;
}

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static int function_data;
static int finalizer_calls_with_correct_data;
static int finalizer_calls_with_incorrect_data;

static void
finalizer (void *data)
{
  if (data == &function_data)
    ++finalizer_calls_with_correct_data;
  else
    ++finalizer_calls_with_incorrect_data;
}

static emacs_value
Fmod_test_make_function_with_finalizer (emacs_env *env, ptrdiff_t nargs,
                                        emacs_value *args, void *data)
{
  emacs_value fun
    = env->make_function (env, 2, 2, Fmod_test_sum, NULL, &function_data);
  env->set_function_finalizer (env, fun, finalizer);
  if (env->get_function_finalizer (env, fun) != finalizer)
    signal_error (env, "Invalid finalizer");
  return fun;
}

static emacs_value
Fmod_test_function_finalizer_calls (emacs_env *env, ptrdiff_t nargs,
                                    emacs_value *args, void *data)
{
  emacs_value Flist = env->intern (env, "list");
  emacs_value list_args[]
    = {env->make_integer (env, finalizer_calls_with_correct_data),
       env->make_integer (env, finalizer_calls_with_incorrect_data)};
  return env->funcall (env, Flist, 2, list_args);
}

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static void
sleep_for_half_second (void)
{
  /* mingw.org's MinGW has nanosleep, but MinGW64 doesn't.  */
#ifdef WINDOWSNT
  Sleep (500);
#else
  const struct timespec sleep = {0, 500000000};
  if (nanosleep (&sleep, NULL) != 0)
    perror ("nanosleep");
#endif
}

#ifdef WINDOWSNT
static void ALIGN_STACK
#else
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static void *
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#endif
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write_to_pipe (void *arg)
{
  /* We sleep a bit to test that writing to a pipe is indeed possible
     if no environment is active. */
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  sleep_for_half_second ();
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  FILE *stream = arg;
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  /* The string below should be identical to the one we compare with
     in emacs-module-tests.el:module/async-pipe.  */
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  if (fputs ("data from thread", stream) < 0)
    perror ("fputs");
  if (fclose (stream) != 0)
    perror ("close");
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#ifndef WINDOWSNT
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  return NULL;
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#endif
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}

static emacs_value
Fmod_test_async_pipe (emacs_env *env, ptrdiff_t nargs, emacs_value *args,
                      void *data)
{
  assert (nargs == 1);
  int fd = env->open_channel (env, args[0]);
  if (env->non_local_exit_check (env) != emacs_funcall_exit_return)
    return NULL;
  FILE *stream = fdopen (fd, "w");
  if (stream == NULL)
    {
      signal_errno (env, "fdopen");
      return NULL;
    }
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#ifdef WINDOWSNT
  uintptr_t thd = _beginthread (write_to_pipe, 0, stream);
  int error = (thd == (uintptr_t)-1L) ? errno : 0;
#else  /* !WINDOWSNT */
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  pthread_t thread;
  int error
    = pthread_create (&thread, NULL, write_to_pipe, stream);
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#endif
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  if (error != 0)
    {
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      signal_system_error (env, error, "thread create");
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      if (fclose (stream) != 0)
        perror ("fclose");
      return NULL;
    }
  return env->intern (env, "nil");
}

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/* Lisp utilities for easier readability (simple wrappers).  */
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/* Provide FEATURE to Emacs.  */
static void
provide (emacs_env *env, const char *feature)
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{
  emacs_value Qfeat = env->intern (env, feature);
  emacs_value Qprovide = env->intern (env, "provide");
  emacs_value args[] = { Qfeat };

  env->funcall (env, Qprovide, 1, args);
}

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/* Bind NAME to FUN.  */
static void
bind_function (emacs_env *env, const char *name, emacs_value Sfun)
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{
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  emacs_value Qdefalias = env->intern (env, "defalias");
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  emacs_value Qsym = env->intern (env, name);
  emacs_value args[] = { Qsym, Sfun };

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  env->funcall (env, Qdefalias, 2, args);
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}

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/* Module init function.  */
int
emacs_module_init (struct emacs_runtime *ert)
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{
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  /* Check that EMACS_MAJOR_VERSION is defined and an integral
     constant.  */
  char dummy[EMACS_MAJOR_VERSION];
  assert (27 <= sizeof dummy);

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  if (ert->size < sizeof *ert)
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    {
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      fprintf (stderr, "Runtime size of runtime structure (%"pT" bytes) "
               "smaller than compile-time size (%"pZ" bytes)",
               (T_TYPE) ert->size, (Z_TYPE) sizeof (*ert));
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      return 1;
    }
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  emacs_env *env = ert->get_environment (ert);

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  if (env->size < sizeof *env)
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    {
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      fprintf (stderr, "Runtime size of environment structure (%"pT" bytes) "
               "smaller than compile-time size (%"pZ" bytes)",
               (T_TYPE) env->size, (Z_TYPE) sizeof (*env));
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      return 2;
    }
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#define DEFUN(lsym, csym, amin, amax, doc, data) \
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  bind_function (env, lsym, \
		 env->make_function (env, amin, amax, csym, doc, data))
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  DEFUN ("mod-test-return-t", Fmod_test_return_t, 1, 1, NULL, NULL);
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  DEFUN ("mod-test-sum", Fmod_test_sum, 2, 2, "Return A + B\n\n(fn a b)",
         (void *) (uintptr_t) 0x1234);
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  DEFUN ("mod-test-signal", Fmod_test_signal, 0, 0, NULL, NULL);
  DEFUN ("mod-test-throw", Fmod_test_throw, 0, 0, NULL, NULL);
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  DEFUN ("mod-test-non-local-exit-funcall", Fmod_test_non_local_exit_funcall,
	 1, 1, NULL, NULL);
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  DEFUN ("mod-test-globref-make", Fmod_test_globref_make, 0, 0, NULL, NULL);
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  DEFUN ("mod-test-globref-free", Fmod_test_globref_free, 4, 4, NULL, NULL);
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  DEFUN ("mod-test-string-a-to-b", Fmod_test_string_a_to_b, 1, 1, NULL, NULL);
  DEFUN ("mod-test-userptr-make", Fmod_test_userptr_make, 1, 1, NULL, NULL);
  DEFUN ("mod-test-userptr-get", Fmod_test_userptr_get, 1, 1, NULL, NULL);
  DEFUN ("mod-test-vector-fill", Fmod_test_vector_fill, 2, 2, NULL, NULL);
  DEFUN ("mod-test-vector-eq", Fmod_test_vector_eq, 2, 2, NULL, NULL);
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  DEFUN ("mod-test-invalid-store", Fmod_test_invalid_store, 0, 0, NULL, NULL);
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  DEFUN ("mod-test-invalid-store-copy", Fmod_test_invalid_store_copy, 0, 0,
         NULL, NULL);
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  DEFUN ("mod-test-invalid-load", Fmod_test_invalid_load, 0, 0, NULL, NULL);
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  DEFUN ("mod-test-invalid-finalizer", Fmod_test_invalid_finalizer, 0, 0,
         NULL, NULL);
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  DEFUN ("mod-test-sleep-until", Fmod_test_sleep_until, 2, 2, NULL, NULL);
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  DEFUN ("mod-test-add-nanosecond", Fmod_test_add_nanosecond, 1, 1, NULL, NULL);
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  DEFUN ("mod-test-nanoseconds", Fmod_test_nanoseconds, 1, 1, NULL, NULL);
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  DEFUN ("mod-test-double", Fmod_test_double, 1, 1, NULL, NULL);
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  DEFUN ("mod-test-make-function-with-finalizer",
         Fmod_test_make_function_with_finalizer, 0, 0, NULL, NULL);
  DEFUN ("mod-test-function-finalizer-calls",
         Fmod_test_function_finalizer_calls, 0, 0, NULL, NULL);
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  DEFUN ("mod-test-async-pipe", Fmod_test_async_pipe, 1, 1, NULL, NULL);
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#undef DEFUN

  provide (env, "mod-test");
  return 0;
}