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Perform work in macro calling environment #19

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Perform work in macro calling environment #19

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8ed7e41
Define library as a constant instead of a function
nnicandro Dec 14, 2017
995894f
Perform work in macro calling environment
nnicandro Dec 14, 2017
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53 changes: 28 additions & 25 deletions ffi.el
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Original file line number Diff line number Diff line change
Expand Up @@ -7,27 +7,31 @@
(gv-define-simple-setter ffi--mem-ref ffi--mem-set t)

(defmacro define-ffi-library (symbol name)
(let ((library (cl-gensym)))
(set library nil)
`(defun ,symbol ()
(or ,library
(setq ,library (ffi--dlopen ,name))))))
`(defconst ,(intern (concat "ffi-" (symbol-name symbol)))
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@tarsius tarsius Mar 17, 2020

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You should not also change the name of the symbol in addition to the change described in the commit message.

(ffi--dlopen ,name)))

(defmacro define-ffi-function (name c-name return-type arg-types library)
(let* (
;; Turn variable references into actual types; while keeping
;; keywords the same.
(arg-types (mapcar #'symbol-value arg-types))
(arg-names (mapcar (lambda (_ignore) (cl-gensym)) arg-types))
(arg-types (vconcat arg-types))
(function (cl-gensym))
(cif (ffi--prep-cif (symbol-value return-type) arg-types)))
(set function nil)
`(defun ,name (,@arg-names)
(unless ,function
(setq ,function (ffi--dlsym ,c-name (,library))))
(let ((arg-names (mapcar (lambda (_ignore) (cl-gensym)) arg-types))
(arg-types (vconcat arg-types))
(function (concat "ffi-fun-" c-name))
(cif (concat "ffi-cif-" c-name))
(library (intern (concat "ffi-" (symbol-name library)))))
;; Adapted from the expansion of lexical-let
`(let ((fun (make-symbol ,function))
(cif (make-symbol ,cif)))
(set fun (ffi--dlsym ,c-name ,library))
;; FIXME do we even need a separate prep?
(ffi--call ,cif ,function ,@arg-names))))
(set cif (ffi--prep-cif ,return-type ,arg-types))
(defalias ',name
(list 'lambda ',arg-names
(list 'funcall (lambda (cif fun ,@arg-names)
(ffi--call (symbol-value cif)
(symbol-value fun)
,@arg-names))
(list 'quote cif)
(list 'quote fun)
,@(cl-loop for arg in arg-names
collect `(quote ,arg))))))))

(defun ffi-lambda (function-pointer return-type arg-types)
(let* ((cif (ffi--prep-cif return-type (vconcat arg-types))))
Expand Down Expand Up @@ -57,10 +61,10 @@
(cl-assert (eq (cadr slot) :type))
(symbol-value (cl-caddr slot)))
slots))
(the-type (apply definer-function field-types))
(field-offsets (funcall layout-function field-types)))
(push `(defvar ,name ,the-type ,docstring)
result-forms)
(push `(defvar ,name (apply #',definer-function ',field-types)
,docstring)
result-forms)
(cl-mapc
(lambda (slot type offset)
(let ((getter-name (intern (concat conc-name
Expand Down Expand Up @@ -97,10 +101,9 @@ SLOT-NAME is a symbol and TYPE is an FFI type descriptor."

(defmacro define-ffi-array (name type length &optional docstring)
;; This is a hack until libffi gives us direct support.
(let ((type-description
(apply #'ffi--define-struct
(make-list (eval length) (symbol-value type)))))
`(defvar ,name ,type-description ,docstring)))
`(defvar ,name (apply #'ffi--define-struct
(make-list ,length ,type))
,docstring))

(defsubst ffi-aref (array type index)
(ffi--mem-ref (ffi-pointer+ array (* index (ffi--type-size type))) type))
Expand Down