Commit | Line | Data |
---|---|---|
513749ee | 1 | ;;; macroexp.el --- Additional macro-expansion support -*- lexical-binding: t; coding: utf-8 -*- |
4d449b11 | 2 | ;; |
ba318903 | 3 | ;; Copyright (C) 2004-2014 Free Software Foundation, Inc. |
4d449b11 MB |
4 | ;; |
5 | ;; Author: Miles Bader <miles@gnu.org> | |
6 | ;; Keywords: lisp, compiler, macros | |
7 | ||
8 | ;; This file is part of GNU Emacs. | |
9 | ||
d6cba7ae | 10 | ;; GNU Emacs is free software: you can redistribute it and/or modify |
4d449b11 | 11 | ;; it under the terms of the GNU General Public License as published by |
d6cba7ae GM |
12 | ;; the Free Software Foundation, either version 3 of the License, or |
13 | ;; (at your option) any later version. | |
4d449b11 MB |
14 | |
15 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
16 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | ;; GNU General Public License for more details. | |
19 | ||
20 | ;; You should have received a copy of the GNU General Public License | |
d6cba7ae | 21 | ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. |
4d449b11 MB |
22 | |
23 | ;;; Commentary: | |
24 | ;; | |
25 | ;; This file contains macro-expansions functions that are not defined in | |
26 | ;; the Lisp core, namely `macroexpand-all', which expands all macros in | |
27 | ;; a form, not just a top-level one. | |
28 | ;; | |
29 | ||
30 | ;;; Code: | |
31 | ||
32 | ;; Bound by the top-level `macroexpand-all', and modified to include any | |
33 | ;; macros defined by `defmacro'. | |
34 | (defvar macroexpand-all-environment nil) | |
35 | ||
fa779ab0 | 36 | (defun macroexp--cons (car cdr original-cons) |
4d449b11 MB |
37 | "Return (CAR . CDR), using ORIGINAL-CONS if possible." |
38 | (if (and (eq car (car original-cons)) (eq cdr (cdr original-cons))) | |
39 | original-cons | |
40 | (cons car cdr))) | |
41 | ||
42 | ;; We use this special macro to iteratively process forms and share list | |
43 | ;; structure of the result with the input. Doing so recursively using | |
fa779ab0 | 44 | ;; `macroexp--cons' results in excessively deep recursion for very long |
4d449b11 | 45 | ;; input forms. |
fa779ab0 | 46 | (defmacro macroexp--accumulate (var+list &rest body) |
4d449b11 MB |
47 | "Return a list of the results of evaluating BODY for each element of LIST. |
48 | Evaluate BODY with VAR bound to each `car' from LIST, in turn. | |
49 | Return a list of the values of the final form in BODY. | |
50 | The list structure of the result will share as much with LIST as | |
51 | possible (for instance, when BODY just returns VAR unchanged, the | |
5de35ba4 RS |
52 | result will be eq to LIST). |
53 | ||
54 | \(fn (VAR LIST) BODY...)" | |
6fe79b7c | 55 | (declare (indent 1)) |
5de35ba4 RS |
56 | (let ((var (car var+list)) |
57 | (list (cadr var+list)) | |
4d449b11 MB |
58 | (shared (make-symbol "shared")) |
59 | (unshared (make-symbol "unshared")) | |
60 | (tail (make-symbol "tail")) | |
61 | (new-el (make-symbol "new-el"))) | |
62 | `(let* ((,shared ,list) | |
63 | (,unshared nil) | |
64 | (,tail ,shared) | |
65 | ,var ,new-el) | |
61b108cc | 66 | (while (consp ,tail) |
4d449b11 MB |
67 | (setq ,var (car ,tail) |
68 | ,new-el (progn ,@body)) | |
69 | (unless (eq ,var ,new-el) | |
70 | (while (not (eq ,shared ,tail)) | |
71 | (push (pop ,shared) ,unshared)) | |
72 | (setq ,shared (cdr ,shared)) | |
73 | (push ,new-el ,unshared)) | |
74 | (setq ,tail (cdr ,tail))) | |
75 | (nconc (nreverse ,unshared) ,shared)))) | |
4d449b11 | 76 | |
fa779ab0 | 77 | (defun macroexp--all-forms (forms &optional skip) |
4d449b11 MB |
78 | "Return FORMS with macros expanded. FORMS is a list of forms. |
79 | If SKIP is non-nil, then don't expand that many elements at the start of | |
80 | FORMS." | |
fa779ab0 | 81 | (macroexp--accumulate (form forms) |
4d449b11 | 82 | (if (or (null skip) (zerop skip)) |
fa779ab0 | 83 | (macroexp--expand-all form) |
4d449b11 MB |
84 | (setq skip (1- skip)) |
85 | form))) | |
86 | ||
fa779ab0 | 87 | (defun macroexp--all-clauses (clauses &optional skip) |
4d449b11 MB |
88 | "Return CLAUSES with macros expanded. |
89 | CLAUSES is a list of lists of forms; any clause that's not a list is ignored. | |
90 | If SKIP is non-nil, then don't expand that many elements at the start of | |
91 | each clause." | |
fa779ab0 | 92 | (macroexp--accumulate (clause clauses) |
4d449b11 | 93 | (if (listp clause) |
fa779ab0 | 94 | (macroexp--all-forms clause skip) |
4d449b11 MB |
95 | clause))) |
96 | ||
f38ea36d SM |
97 | (defun macroexp--compiler-macro (handler form) |
98 | (condition-case err | |
99 | (apply handler form (cdr form)) | |
985c035f DC |
100 | (error |
101 | (message "--------------------------------------------------") | |
102 | (backtrace) | |
103 | (message "Compiler-macro error for %S: %S" (car form) err) | |
a64a94ed | 104 | form))) |
f38ea36d | 105 | |
ce97595b | 106 | (defun macroexp--funcall-if-compiled (_form) |
972debf2 SM |
107 | "Pseudo function used internally by macroexp to delay warnings. |
108 | The purpose is to delay warnings to bytecomp.el, so they can use things | |
109 | like `byte-compile-log-warning' to get better file-and-line-number data | |
110 | and also to avoid outputting the warning during normal execution." | |
111 | nil) | |
ce97595b | 112 | (put 'macroexp--funcall-if-compiled 'byte-compile |
972debf2 | 113 | (lambda (form) |
ce97595b | 114 | (funcall (eval (cadr form))) |
972debf2 SM |
115 | (byte-compile-constant nil))) |
116 | ||
208d0342 SM |
117 | (defun macroexp--compiling-p () |
118 | "Return non-nil if we're macroexpanding for the compiler." | |
119 | ;; FIXME: ¡¡Major Ugly Hack!! To determine whether the output of this | |
120 | ;; macro-expansion will be processed by the byte-compiler, we check | |
121 | ;; circumstantial evidence. | |
122 | (member '(declare-function . byte-compile-macroexpand-declare-function) | |
123 | macroexpand-all-environment)) | |
124 | ||
125 | ||
95b9712e SM |
126 | (defun macroexp--warn-and-return (msg form) |
127 | (let ((when-compiled (lambda () (byte-compile-log-warning msg t)))) | |
128 | (cond | |
129 | ((null msg) form) | |
208d0342 | 130 | ((macroexp--compiling-p) |
ce97595b SM |
131 | `(progn |
132 | (macroexp--funcall-if-compiled ',when-compiled) | |
95b9712e SM |
133 | ,form)) |
134 | (t | |
a5f74442 GM |
135 | (message "%s%s" (if (stringp load-file-name) |
136 | (concat (file-relative-name load-file-name) ": ") | |
137 | "") | |
138 | msg) | |
95b9712e SM |
139 | form)))) |
140 | ||
141 | (defun macroexp--obsolete-warning (fun obsolescence-data type) | |
142 | (let ((instead (car obsolescence-data)) | |
143 | (asof (nth 2 obsolescence-data))) | |
144 | (format "`%s' is an obsolete %s%s%s" fun type | |
145 | (if asof (concat " (as of " asof ")") "") | |
146 | (cond ((stringp instead) (concat "; " instead)) | |
147 | (instead (format "; use `%s' instead." instead)) | |
148 | (t "."))))) | |
35f5b19d | 149 | |
fa779ab0 | 150 | (defun macroexp--expand-all (form) |
4d449b11 MB |
151 | "Expand all macros in FORM. |
152 | This is an internal version of `macroexpand-all'. | |
153 | Assumes the caller has bound `macroexpand-all-environment'." | |
154 | (if (and (listp form) (eq (car form) 'backquote-list*)) | |
155 | ;; Special-case `backquote-list*', as it is normally a macro that | |
156 | ;; generates exceedingly deep expansions from relatively shallow input | |
157 | ;; forms. We just process it `in reverse' -- first we expand all the | |
158 | ;; arguments, _then_ we expand the top-level definition. | |
fa779ab0 | 159 | (macroexpand (macroexp--all-forms form 1) |
4d449b11 MB |
160 | macroexpand-all-environment) |
161 | ;; Normal form; get its expansion, and then expand arguments. | |
972debf2 SM |
162 | (let ((new-form |
163 | (macroexpand form macroexpand-all-environment))) | |
164 | (setq form | |
165 | (if (and (not (eq form new-form)) ;It was a macro call. | |
166 | (car-safe form) | |
167 | (symbolp (car form)) | |
63314e57 SM |
168 | (get (car form) 'byte-obsolete-info) |
169 | (or (not (fboundp 'byte-compile-warning-enabled-p)) | |
170 | (byte-compile-warning-enabled-p 'obsolete))) | |
95b9712e SM |
171 | (let* ((fun (car form)) |
172 | (obsolete (get fun 'byte-obsolete-info))) | |
173 | (macroexp--warn-and-return | |
63314e57 SM |
174 | (macroexp--obsolete-warning |
175 | fun obsolete | |
176 | (if (symbolp (symbol-function fun)) | |
177 | "alias" "macro")) | |
95b9712e | 178 | new-form)) |
972debf2 | 179 | new-form))) |
6fe79b7c SM |
180 | (pcase form |
181 | (`(cond . ,clauses) | |
fa779ab0 | 182 | (macroexp--cons 'cond (macroexp--all-clauses clauses) form)) |
6fe79b7c | 183 | (`(condition-case . ,(or `(,err ,body . ,handlers) dontcare)) |
fa779ab0 | 184 | (macroexp--cons |
6fe79b7c | 185 | 'condition-case |
fa779ab0 SM |
186 | (macroexp--cons err |
187 | (macroexp--cons (macroexp--expand-all body) | |
188 | (macroexp--all-clauses handlers 1) | |
6fe79b7c SM |
189 | (cddr form)) |
190 | (cdr form)) | |
191 | form)) | |
fa779ab0 | 192 | (`(,(or `defvar `defconst) . ,_) (macroexp--all-forms form 2)) |
6fe79b7c | 193 | (`(function ,(and f `(lambda . ,_))) |
fa779ab0 SM |
194 | (macroexp--cons 'function |
195 | (macroexp--cons (macroexp--all-forms f 2) | |
6fe79b7c SM |
196 | nil |
197 | (cdr form)) | |
198 | form)) | |
199 | (`(,(or `function `quote) . ,_) form) | |
200 | (`(,(and fun (or `let `let*)) . ,(or `(,bindings . ,body) dontcare)) | |
fa779ab0 SM |
201 | (macroexp--cons fun |
202 | (macroexp--cons (macroexp--all-clauses bindings 1) | |
203 | (macroexp--all-forms body) | |
6fe79b7c SM |
204 | (cdr form)) |
205 | form)) | |
3d60a9ba RT |
206 | (`(,(and fun (or `flet `labels)) . ,(or `(,bindings . ,body) dontcare)) |
207 | (macroexp--cons fun | |
208 | (macroexp--cons (macroexp--all-clauses bindings 2) | |
209 | (macroexp--all-forms body) | |
210 | (cdr form)) | |
211 | form)) | |
6fe79b7c SM |
212 | (`(,(and fun `(lambda . ,_)) . ,args) |
213 | ;; Embedded lambda in function position. | |
fa779ab0 SM |
214 | (macroexp--cons (macroexp--all-forms fun 2) |
215 | (macroexp--all-forms args) | |
6fe79b7c SM |
216 | form)) |
217 | ;; The following few cases are for normal function calls that | |
218 | ;; are known to funcall one of their arguments. The byte | |
219 | ;; compiler has traditionally handled these functions specially | |
220 | ;; by treating a lambda expression quoted by `quote' as if it | |
221 | ;; were quoted by `function'. We make the same transformation | |
222 | ;; here, so that any code that cares about the difference will | |
223 | ;; see the same transformation. | |
224 | ;; First arg is a function: | |
9c848d8a | 225 | (`(,(and fun (or `funcall `apply `mapcar `mapatoms `mapconcat `mapc)) |
876c194c | 226 | ',(and f `(lambda . ,_)) . ,args) |
ce97595b | 227 | (macroexp--warn-and-return |
9c848d8a SM |
228 | (format "%s quoted with ' rather than with #'" |
229 | (list 'lambda (nth 1 f) '...)) | |
ce97595b | 230 | (macroexp--expand-all `(,fun ,f . ,args)))) |
6fe79b7c | 231 | ;; Second arg is a function: |
876c194c | 232 | (`(,(and fun (or `sort)) ,arg1 ',(and f `(lambda . ,_)) . ,args) |
ce97595b | 233 | (macroexp--warn-and-return |
9c848d8a SM |
234 | (format "%s quoted with ' rather than with #'" |
235 | (list 'lambda (nth 1 f) '...)) | |
ce97595b | 236 | (macroexp--expand-all `(,fun ,arg1 ,f . ,args)))) |
57a7d507 SM |
237 | (`(,func . ,_) |
238 | ;; Macro expand compiler macros. This cannot be delayed to | |
239 | ;; byte-optimize-form because the output of the compiler-macro can | |
240 | ;; use macros. | |
7abaf5cc | 241 | (let ((handler (function-get func 'compiler-macro))) |
57a7d507 SM |
242 | (if (null handler) |
243 | ;; No compiler macro. We just expand each argument (for | |
244 | ;; setq/setq-default this works alright because the variable names | |
245 | ;; are symbols). | |
fa779ab0 | 246 | (macroexp--all-forms form 1) |
d9857e53 SM |
247 | ;; If the handler is not loaded yet, try (auto)loading the |
248 | ;; function itself, which may in turn load the handler. | |
7abaf5cc | 249 | (unless (functionp handler) |
d9857e53 | 250 | (ignore-errors |
7abaf5cc | 251 | (autoload-do-load (indirect-function func) func))) |
f38ea36d | 252 | (let ((newform (macroexp--compiler-macro handler form))) |
57a7d507 SM |
253 | (if (eq form newform) |
254 | ;; The compiler macro did not find anything to do. | |
fa779ab0 | 255 | (if (equal form (setq newform (macroexp--all-forms form 1))) |
57a7d507 SM |
256 | form |
257 | ;; Maybe after processing the args, some new opportunities | |
258 | ;; appeared, so let's try the compiler macro again. | |
f38ea36d | 259 | (setq form (macroexp--compiler-macro handler newform)) |
53aacf21 | 260 | (if (eq newform form) |
57a7d507 | 261 | newform |
fa779ab0 SM |
262 | (macroexp--expand-all newform))) |
263 | (macroexp--expand-all newform)))))) | |
57a7d507 | 264 | |
6fe79b7c | 265 | (t form)))) |
4d449b11 MB |
266 | |
267 | ;;;###autoload | |
268 | (defun macroexpand-all (form &optional environment) | |
269 | "Return result of expanding macros at all levels in FORM. | |
270 | If no macros are expanded, FORM is returned unchanged. | |
271 | The second optional arg ENVIRONMENT specifies an environment of macro | |
272 | definitions to shadow the loaded ones for use in file byte-compilation." | |
273 | (let ((macroexpand-all-environment environment)) | |
fa779ab0 | 274 | (macroexp--expand-all form))) |
4d449b11 | 275 | |
4dd1c416 SM |
276 | ;;; Handy functions to use in macros. |
277 | ||
278 | (defun macroexp-progn (exps) | |
279 | "Return an expression equivalent to `(progn ,@EXPS)." | |
280 | (if (cdr exps) `(progn ,@exps) (car exps))) | |
281 | ||
de7e2b36 SM |
282 | (defun macroexp-unprogn (exp) |
283 | "Turn EXP into a list of expressions to execute in sequence." | |
284 | (if (eq (car-safe exp) 'progn) (cdr exp) (list exp))) | |
285 | ||
4dd1c416 SM |
286 | (defun macroexp-let* (bindings exp) |
287 | "Return an expression equivalent to `(let* ,bindings ,exp)." | |
288 | (cond | |
289 | ((null bindings) exp) | |
290 | ((eq 'let* (car-safe exp)) `(let* (,@bindings ,@(cadr exp)) ,@(cddr exp))) | |
291 | (t `(let* ,bindings ,exp)))) | |
292 | ||
293 | (defun macroexp-if (test then else) | |
294 | "Return an expression equivalent to `(if ,test ,then ,else)." | |
295 | (cond | |
296 | ((eq (car-safe else) 'if) | |
297 | (if (equal test (nth 1 else)) | |
298 | ;; Doing a test a second time: get rid of the redundancy. | |
299 | `(if ,test ,then ,@(nthcdr 3 else)) | |
300 | `(cond (,test ,then) | |
301 | (,(nth 1 else) ,(nth 2 else)) | |
302 | (t ,@(nthcdr 3 else))))) | |
303 | ((eq (car-safe else) 'cond) | |
304 | `(cond (,test ,then) | |
305 | ;; Doing a test a second time: get rid of the redundancy, as above. | |
306 | ,@(remove (assoc test else) (cdr else)))) | |
307 | ;; Invert the test if that lets us reduce the depth of the tree. | |
308 | ((memq (car-safe then) '(if cond)) (macroexp-if `(not ,test) else then)) | |
309 | (t `(if ,test ,then ,else)))) | |
310 | ||
2ee3d7f0 | 311 | (defmacro macroexp-let2 (test var exp &rest exps) |
4dd1c416 SM |
312 | "Bind VAR to a copyable expression that returns the value of EXP. |
313 | This is like `(let ((v ,EXP)) ,EXPS) except that `v' is a new generated | |
314 | symbol which EXPS can find in VAR. | |
315 | TEST should be the name of a predicate on EXP checking whether the `let' can | |
316 | be skipped; if nil, as is usual, `macroexp-const-p' is used." | |
dc5d230c | 317 | (declare (indent 3) (debug (sexp sexp form body))) |
4dd1c416 SM |
318 | (let ((bodysym (make-symbol "body")) |
319 | (expsym (make-symbol "exp"))) | |
320 | `(let* ((,expsym ,exp) | |
dc5d230c | 321 | (,var (if (funcall #',(or test #'macroexp-const-p) ,expsym) |
f5695c9a | 322 | ,expsym (make-symbol ,(symbol-name var)))) |
4dd1c416 SM |
323 | (,bodysym ,(macroexp-progn exps))) |
324 | (if (eq ,var ,expsym) ,bodysym | |
325 | (macroexp-let* (list (list ,var ,expsym)) | |
326 | ,bodysym))))) | |
327 | ||
2ee3d7f0 SM |
328 | (defun macroexp--maxsize (exp size) |
329 | (cond ((< size 0) size) | |
330 | ((symbolp exp) (1- size)) | |
331 | ((stringp exp) (- size (/ (length exp) 16))) | |
332 | ((vectorp exp) | |
333 | (dotimes (i (length exp)) | |
334 | (setq size (macroexp--maxsize (aref exp i) size))) | |
335 | (1- size)) | |
336 | ((consp exp) | |
337 | ;; We could try to be more clever with quote&function, | |
338 | ;; but it is difficult to do so correctly, and it's not obvious that | |
339 | ;; it would be worth the effort. | |
340 | (dolist (e exp) | |
341 | (setq size (macroexp--maxsize e size))) | |
342 | (1- size)) | |
343 | (t -1))) | |
344 | ||
345 | (defun macroexp-small-p (exp) | |
346 | "Return non-nil if EXP can be considered small." | |
347 | (> (macroexp--maxsize exp 10) 0)) | |
348 | ||
4dd1c416 SM |
349 | (defsubst macroexp--const-symbol-p (symbol &optional any-value) |
350 | "Non-nil if SYMBOL is constant. | |
351 | If ANY-VALUE is nil, only return non-nil if the value of the symbol is the | |
352 | symbol itself." | |
353 | (or (memq symbol '(nil t)) | |
354 | (keywordp symbol) | |
355 | (if any-value | |
356 | (or (memq symbol byte-compile-const-variables) | |
357 | ;; FIXME: We should provide a less intrusive way to find out | |
358 | ;; if a variable is "constant". | |
359 | (and (boundp symbol) | |
360 | (condition-case nil | |
361 | (progn (set symbol (symbol-value symbol)) nil) | |
362 | (setting-constant t))))))) | |
363 | ||
364 | (defun macroexp-const-p (exp) | |
365 | "Return non-nil if EXP will always evaluate to the same value." | |
366 | (cond ((consp exp) (or (eq (car exp) 'quote) | |
367 | (and (eq (car exp) 'function) | |
368 | (symbolp (cadr exp))))) | |
369 | ;; It would sometimes make sense to pass `any-value', but it's not | |
370 | ;; always safe since a "constant" variable may not actually always have | |
371 | ;; the same value. | |
372 | ((symbolp exp) (macroexp--const-symbol-p exp)) | |
373 | (t t))) | |
374 | ||
375 | (defun macroexp-copyable-p (exp) | |
376 | "Return non-nil if EXP can be copied without extra cost." | |
377 | (or (symbolp exp) (macroexp-const-p exp))) | |
378 | ||
972debf2 SM |
379 | ;;; Load-time macro-expansion. |
380 | ||
381 | ;; Because macro-expansion used to be more lazy, eager macro-expansion | |
382 | ;; tends to bump into previously harmless/unnoticeable cyclic-dependencies. | |
383 | ;; So, we have to delay macro-expansion like we used to when we detect | |
384 | ;; such a cycle, and we also want to help coders resolve those cycles (since | |
385 | ;; they can be non-obvious) by providing a usefully trimmed backtrace | |
386 | ;; (hopefully) highlighting the problem. | |
387 | ||
388 | (defun macroexp--backtrace () | |
389 | "Return the Elisp backtrace, more recent frames first." | |
390 | (let ((bt ()) | |
391 | (i 0)) | |
392 | (while | |
393 | (let ((frame (backtrace-frame i))) | |
394 | (when frame | |
395 | (push frame bt) | |
396 | (setq i (1+ i))))) | |
397 | (nreverse bt))) | |
398 | ||
399 | (defun macroexp--trim-backtrace-frame (frame) | |
400 | (pcase frame | |
401 | (`(,_ macroexpand (,head . ,_) . ,_) `(macroexpand (,head …))) | |
402 | (`(,_ internal-macroexpand-for-load (,head ,second . ,_) . ,_) | |
403 | (if (or (symbolp second) | |
404 | (and (eq 'quote (car-safe second)) | |
405 | (symbolp (cadr second)))) | |
406 | `(macroexpand-all (,head ,second …)) | |
407 | '(macroexpand-all …))) | |
408 | (`(,_ load-with-code-conversion ,name . ,_) | |
409 | `(load ,(file-name-nondirectory name))))) | |
410 | ||
411 | (defvar macroexp--pending-eager-loads nil | |
412 | "Stack of files currently undergoing eager macro-expansion.") | |
413 | ||
12b1389c | 414 | (defun internal-macroexpand-for-load (form full-p) |
972debf2 SM |
415 | ;; Called from the eager-macroexpansion in readevalloop. |
416 | (cond | |
417 | ;; Don't repeat the same warning for every top-level element. | |
418 | ((eq 'skip (car macroexp--pending-eager-loads)) form) | |
419 | ;; If we detect a cycle, skip macro-expansion for now, and output a warning | |
420 | ;; with a trimmed backtrace. | |
421 | ((and load-file-name (member load-file-name macroexp--pending-eager-loads)) | |
422 | (let* ((bt (delq nil | |
423 | (mapcar #'macroexp--trim-backtrace-frame | |
424 | (macroexp--backtrace)))) | |
425 | (elem `(load ,(file-name-nondirectory load-file-name))) | |
426 | (tail (member elem (cdr (member elem bt))))) | |
427 | (if tail (setcdr tail (list '…))) | |
428 | (if (eq (car-safe (car bt)) 'macroexpand-all) (setq bt (cdr bt))) | |
429 | (message "Warning: Eager macro-expansion skipped due to cycle:\n %s" | |
430 | (mapconcat #'prin1-to-string (nreverse bt) " => ")) | |
431 | (push 'skip macroexp--pending-eager-loads) | |
432 | form)) | |
433 | (t | |
434 | (condition-case err | |
435 | (let ((macroexp--pending-eager-loads | |
436 | (cons load-file-name macroexp--pending-eager-loads))) | |
12b1389c DC |
437 | (if full-p |
438 | (macroexpand-all form) | |
439 | (macroexpand form))) | |
972debf2 SM |
440 | (error |
441 | ;; Hopefully this shouldn't happen thanks to the cycle detection, | |
442 | ;; but in case it does happen, let's catch the error and give the | |
443 | ;; code a chance to macro-expand later. | |
444 | (message "Eager macro-expansion failure: %S" err) | |
445 | form))))) | |
446 | ||
447 | ;; ¡¡¡ Big Ugly Hack !!! | |
448 | ;; src/bootstrap-emacs is mostly used to compile .el files, so it needs | |
449 | ;; macroexp, bytecomp, cconv, and byte-opt to be fast. Generally this is done | |
450 | ;; by compiling those files first, but this only makes a difference if those | |
451 | ;; files are not preloaded. But macroexp.el is preloaded so we reload it if | |
452 | ;; the current version is interpreted and there's a compiled version available. | |
453 | (eval-when-compile | |
454 | (add-hook 'emacs-startup-hook | |
455 | (lambda () | |
456 | (and (not (byte-code-function-p | |
457 | (symbol-function 'macroexpand-all))) | |
458 | (locate-library "macroexp.elc") | |
459 | (load "macroexp.elc"))))) | |
460 | ||
4d449b11 MB |
461 | (provide 'macroexp) |
462 | ||
4d449b11 | 463 | ;;; macroexp.el ends here |