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Previously, the names of arguments and other details were needlessly
inconsistent between the documentation, the declarations, and the
definitions, as well as between each other. This commit makes them
more consistent, in most cases by applying the names from the
documentation everywhere.
* src/module-env-27.h:
* src/module-env-25.h:
* src/emacs-module.h.in:
* src/emacs-module.c (module_get_environment)
(module_make_global_ref, module_free_global_ref)
(module_non_local_exit_get, module_non_local_exit_signal)
(module_make_function, module_funcall, module_type_of)
(module_is_not_nil, module_extract_integer)
(module_extract_float, module_copy_string_contents)
(module_make_string, module_vec_set, module_vec_get)
(module_vec_size, module_extract_time)
(module_assert_runtime):
* doc/lispref/internals.texi (Module Initialization)
(Module Functions, Module Values): Make argument names and some other
details consistent. No functional changes.
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* src/module-env-27.h:
* src/emacs-module.c (module_make_big_integer): Use 'emacs_limb_t'
instead of 'unsigned long' consistently
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As described in the new comment added to emacs-module.c, using GMP
directly in the module interface has significant downsides: it couples
the module interface directly to the implementation and requires
module authors to link their module against the same GMP library as
Emacs itself, which is often difficult and an unnecessary burden. By
picking a representation for the magnitude that often matches the one
used by GMP, we can avoid overhead when converting from and to GMP in
most cases.
Loading the test module in test/data/emacs-module and evaluating
(dotimes (_ 10000)
(mod-test-double (* 2 most-negative-fixnum)))
under Callgrind shows that on my (GNU/Linux) machine Emacs only spends
10% of the CPU time of mod-test-double in mpz_import and mpz_export
combined, even though that function does little else. (By contrast,
30% is spent in allocate_pseudovector.)
* src/emacs-module.h.in: Don't check EMACS_MODULE_GMP. Don't include
gmp.h. Remove emacs_mpz structure. Instead, define type alias
emacs_limb_t and macro EMACS_LIMB_MAX.
* src/module-env-27.h: Change interface of extract_big_integer and
make_big_integer to take a sign-magnitude representation instead of
mpz_t.
* src/emacs-module.c: Don't check EMACS_MODULE_GMP or
EMACS_MODULE_HAVE_MPZ_T. Add a comment about the chosen
implementation.
(module_extract_big_integer, module_make_big_integer): Reimplement
without using mpz_t in the interface.
* doc/lispref/internals.texi (Module Values): Adapt function
documentation and example. Stop mentioning GMP and EMACS_MODULE_GMP.
* test/data/emacs-module/mod-test.c: Don't define EMACS_MODULE_GMP or
EMACS_MODULE_HAVE_MPZ_T.
(memory_full, extract_big_integer, make_big_integer): New helper
functions, identical to example in the Info documentation.
(Fmod_test_nanoseconds, Fmod_test_double): Adapt to new interface.
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* 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.
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Time values are a fundamental data type, and such conversions are hard
to implement within modules because of the various forms of time
values in Emacs Lisp. Adding dedicated conversion functions can
significantly simplify module code dealing with times.
This approach uses nanosecond precision. While Emacs in theory has
support for higher-precision time values, in practice most languages
and standards, such as POSIX, C, Java, and Go, have settled on
nanosecond-precision integers to represent time.
* src/emacs-module.h.in: Add header for struct timespec.
* src/module-env-27.h: Add module functions for time conversion.
* src/emacs-module.c (module_extract_time, module_make_time): New
functions.
(initialize_environment): Use them.
* test/data/emacs-module/mod-test.c (Fmod_test_add_nanosecond): New
test function.
(emacs_module_init): Define it.
* test/src/emacs-module-tests.el (mod-test-add-nanosecond/valid)
(mod-test-add-nanosecond/nil, mod-test-add-nanosecond/invalid): New
unit tests.
* doc/lispref/internals.texi (Module Values): Document time
conversion functions.
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pending_signals is often set if no quit is pending. This results in
bugs in module code if the module returns but no quit is actually
pending.
As a better alternative, add a new process_input environment function
for Emacs 27. That function processes signals (like maybe_quit).
* configure.ac: Add module snippet for Emacs 27.
* src/module-env-27.h: New file.
* src/emacs-module.h.in: Add process_input function to environment
interface.
* src/emacs-module.c (module_should_quit): Use QUITP macro to check
whether the caller should quit.
(module_process_input): New function.
(initialize_environment): Use it.
* src/eval.c: Remove obsolete comment.
* test/data/emacs-module/mod-test.c (signal_wrong_type_argument)
(signal_errno): New helper functions.
(Fmod_test_sleep_until): New test module function.
* test/src/emacs-module-tests.el (mod-test-sleep-until): New unit
test.
* doc/lispref/internals.texi (Module Misc): Document process_input.
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