Function: byte-compile-file-form-defalias

byte-compile-file-form-defalias is a byte-compiled function defined in bytecomp.el.gz.

Signature

(byte-compile-file-form-defalias FORM)

Source Code

;; Defined in /usr/src/emacs/lisp/emacs-lisp/bytecomp.el.gz
;; Used for eieio--defalias as well.
(defun byte-compile-file-form-defalias (form)
  ;; For the compilation itself, we could largely get rid of this hunk-handler,
  ;; if it weren't for the fact that we need to figure out when a defalias
  ;; defines a macro, so as to add it to byte-compile-macro-environment.
  (let ((byte-compile-free-references nil)
        (byte-compile-free-assignments nil))
    (pcase form
      ;; Decompose `form' into:
      ;; - `name' is the name of the defined function.
      ;; - `arg' is the expression to which it is defined.
      ;; - `rest' is the rest of the arguments.
      (`(,_ ',name ,arg . ,rest)
       (let ((doc (car rest)))
         (when (stringp doc)
           (setq rest (byte-compile--list-with-n
                       rest 0
                       (byte-compile--docstring doc (nth 0 form) name)))))
       (pcase-let*
           ;; `macro' is non-nil if it defines a macro.
           ;; `fun' is the function part of `arg' (defaults to `arg').
           (((or (and (or `(cons 'macro ,fun) `'(macro . ,fun)) (let macro t))
                 (and (let fun arg) (let macro nil)))
             arg)
            ;; `lam' is the lambda expression in `fun' (or nil if not
            ;; recognized).
            ((or `(,(or 'quote 'function) ,lam) (let lam nil))
             fun)
            ;; `arglist' is the list of arguments (or t if not recognized).
            ;; `body' is the body of `lam' (or t if not recognized).
            ((or `(lambda ,arglist . ,body)
                 (and `(internal-make-closure ,arglist . ,_) (let body t))
                 (and (let arglist t) (let body t)))
             lam))
         (unless (byte-compile-file-form-defmumble
                  name macro arglist body rest)
           (when macro
             (if (null fun)
                 (message "Macro %s unrecognized, won't work in file" name)
               (message "Macro %s partly recognized, trying our luck" name)
               (push (cons name (eval fun))
                     byte-compile-macro-environment)))
           (byte-compile-keep-pending form))))

      ;; We used to just do: (byte-compile-normal-call form)
      ;; But it turns out that this fails to optimize the code.
      ;; So instead we now do the same as what other byte-hunk-handlers do,
      ;; which is to call back byte-compile-file-form and then return nil.
      ;; Except that we can't just call byte-compile-file-form since it would
      ;; call us right back.
      (_ (byte-compile-keep-pending form)))))