Add module functions to convert from and to big integers.

* src/module-env-27.h: Add new module functions to convert big
integers.

* src/emacs-module.h.in (emacs_mpz): Define if GMP is available.

* src/emacs-module.c (module_extract_big_integer)
(module_make_big_integer): New functions.
(initialize_environment): Use them.

* test/data/emacs-module/mod-test.c (Fmod_test_double): New test
function.
(emacs_module_init): Define it.

* test/src/emacs-module-tests.el (mod-test-double): New unit test.

* doc/lispref/internals.texi (Module Values): Document new functions.

1 files changed, 8 insertions, 0 deletions

diff --git a/src/module-env-27.h b/src/module-env-27.h
index e63843f8d63..00de3009007 100644
--- a/src/module-env-27.h
+++ b/src/module-env-27.h
@@ -8,3 +8,11 @@
 
   emacs_value (*make_time) (emacs_env *env, struct timespec time)
     EMACS_ATTRIBUTE_NONNULL (1);
+
+  void (*extract_big_integer) (emacs_env *env, emacs_value value,
+                               struct emacs_mpz *result)
+    EMACS_ATTRIBUTE_NONNULL (1, 3);
+
+  emacs_value (*make_big_integer) (emacs_env *env,
+                                   const struct emacs_mpz *value)
+    EMACS_ATTRIBUTE_NONNULL (1, 2);