bytecomp.el 185 KB
Newer Older
1
;;; bytecomp.el --- compilation of Lisp code into byte code -*- lexical-binding: t -*-
2

3
;; Copyright (C) 1985-1987, 1992, 1994, 1998, 2000-2012
Glenn Morris's avatar
Glenn Morris committed
4
;;   Free Software Foundation, Inc.
Eric S. Raymond's avatar
Eric S. Raymond committed
5

6 7
;; Author: Jamie Zawinski <jwz@lucid.com>
;;	Hallvard Furuseth <hbf@ulrik.uio.no>
8
;; Maintainer: FSF
Richard M. Stallman's avatar
Richard M. Stallman committed
9
;; Keywords: lisp
10
;; Package: emacs
Jim Blandy's avatar
Jim Blandy committed
11 12 13

;; This file is part of GNU Emacs.

14
;; GNU Emacs is free software: you can redistribute it and/or modify
Jim Blandy's avatar
Jim Blandy committed
15
;; it under the terms of the GNU General Public License as published by
16 17
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
Jim Blandy's avatar
Jim Blandy committed
18 19 20 21 22 23 24

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
25
;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
Jim Blandy's avatar
Jim Blandy committed
26

27 28 29
;;; Commentary:

;; The Emacs Lisp byte compiler.  This crunches lisp source into a sort
30 31
;; of p-code (`lapcode') which takes up less space and can be interpreted
;; faster.  [`LAP' == `Lisp Assembly Program'.]
32 33
;; The user entry points are byte-compile-file and byte-recompile-directory.

34 35
;;; Code:

Erik Naggum's avatar
Erik Naggum committed
36 37 38
;; ========================================================================
;; Entry points:
;;	byte-recompile-directory, byte-compile-file,
39
;;      byte-recompile-file,
Erik Naggum's avatar
Erik Naggum committed
40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62
;;     batch-byte-compile, batch-byte-recompile-directory,
;;	byte-compile, compile-defun,
;;	display-call-tree
;; (byte-compile-buffer and byte-compile-and-load-file were turned off
;;  because they are not terribly useful and get in the way of completion.)

;; This version of the byte compiler has the following improvements:
;;  + optimization of compiled code:
;;    - removal of unreachable code;
;;    - removal of calls to side-effectless functions whose return-value
;;      is unused;
;;    - compile-time evaluation of safe constant forms, such as (consp nil)
;;      and (ash 1 6);
;;    - open-coding of literal lambdas;
;;    - peephole optimization of emitted code;
;;    - trivial functions are left uncompiled for speed.
;;  + support for inline functions;
;;  + compile-time evaluation of arbitrary expressions;
;;  + compile-time warning messages for:
;;    - functions being redefined with incompatible arglists;
;;    - functions being redefined as macros, or vice-versa;
;;    - functions or macros defined multiple times in the same file;
;;    - functions being called with the incorrect number of arguments;
Dave Love's avatar
Dave Love committed
63
;;    - functions being called which are not defined globally, in the
Erik Naggum's avatar
Erik Naggum committed
64 65 66 67 68 69 70
;;      file, or as autoloads;
;;    - assignment and reference of undeclared free variables;
;;    - various syntax errors;
;;  + correct compilation of nested defuns, defmacros, defvars and defsubsts;
;;  + correct compilation of top-level uses of macros;
;;  + the ability to generate a histogram of functions called.

71
;; User customization variables: M-x customize-group bytecomp
Erik Naggum's avatar
Erik Naggum committed
72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89

;; New Features:
;;
;;  o	The form `defsubst' is just like `defun', except that the function
;;	generated will be open-coded in compiled code which uses it.  This
;;	means that no function call will be generated, it will simply be
;;	spliced in.  Lisp functions calls are very slow, so this can be a
;;	big win.
;;
;;	You can generally accomplish the same thing with `defmacro', but in
;;	that case, the defined procedure can't be used as an argument to
;;	mapcar, etc.
;;
;;  o	You can also open-code one particular call to a function without
;;	open-coding all calls.  Use the 'inline' form to do this, like so:
;;
;;		(inline (foo 1 2 3))	;; `foo' will be open-coded
;;	or...
Dave Love's avatar
Dave Love committed
90
;;		(inline			;;  `foo' and `baz' will be
Erik Naggum's avatar
Erik Naggum committed
91 92 93 94
;;		 (foo 1 2 3 (bar 5))	;; open-coded, but `bar' will not.
;;		 (baz 0))
;;
;;  o	It is possible to open-code a function in the same file it is defined
Kenichi Handa's avatar
Kenichi Handa committed
95
;;	in without having to load that file before compiling it.  The
Erik Naggum's avatar
Erik Naggum committed
96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112
;;	byte-compiler has been modified to remember function definitions in
;;	the compilation environment in the same way that it remembers macro
;;	definitions.
;;
;;  o  Forms like ((lambda ...) ...) are open-coded.
;;
;;  o  The form `eval-when-compile' is like progn, except that the body
;;     is evaluated at compile-time.  When it appears at top-level, this
;;     is analogous to the Common Lisp idiom (eval-when (compile) ...).
;;     When it does not appear at top-level, it is similar to the
;;     Common Lisp #. reader macro (but not in interpreted code).
;;
;;  o  The form `eval-and-compile' is similar to eval-when-compile, but
;;	the whole form is evalled both at compile-time and at run-time.
;;
;;  o  The command compile-defun is analogous to eval-defun.
;;
Dave Love's avatar
Dave Love committed
113
;;  o  If you run byte-compile-file on a filename which is visited in a
Erik Naggum's avatar
Erik Naggum committed
114 115 116 117 118
;;     buffer, and that buffer is modified, you are asked whether you want
;;     to save the buffer before compiling.
;;
;;  o  byte-compiled files now start with the string `;ELC'.
;;     Some versions of `file' can be customized to recognize that.
Jim Blandy's avatar
Jim Blandy committed
119

120
(require 'backquote)
121
(require 'macroexp)
122
(require 'cconv)
123
(eval-when-compile (require 'cl))
124

Jim Blandy's avatar
Jim Blandy committed
125 126
(or (fboundp 'defsubst)
    ;; This really ought to be loaded already!
127
    (load "byte-run"))
Jim Blandy's avatar
Jim Blandy committed
128

129 130
;; The feature of compiling in a specific target Emacs version
;; has been turned off because compile time options are a bad idea.
Richard M. Stallman's avatar
Richard M. Stallman committed
131
(defgroup bytecomp nil
132
  "Emacs Lisp byte-compiler."
Richard M. Stallman's avatar
Richard M. Stallman committed
133 134
  :group 'lisp)

135
(defcustom emacs-lisp-file-regexp "\\.el\\'"
136
  "Regexp which matches Emacs Lisp source files.
137
If you change this, you might want to set `byte-compile-dest-file-function'."
Richard M. Stallman's avatar
Richard M. Stallman committed
138 139
  :group 'bytecomp
  :type 'regexp)
Jim Blandy's avatar
Jim Blandy committed
140

141 142 143 144 145 146 147 148
(defcustom byte-compile-dest-file-function nil
  "Function for the function `byte-compile-dest-file' to call.
It should take one argument, the name of an Emacs Lisp source
file name, and return the name of the compiled file."
  :group 'bytecomp
  :type '(choice (const nil) function)
  :version "23.2")

149 150 151 152 153 154 155 156 157 158
;; This enables file name handlers such as jka-compr
;; to remove parts of the file name that should not be copied
;; through to the output file name.
(defun byte-compiler-base-file-name (filename)
  (let ((handler (find-file-name-handler filename
					 'byte-compiler-base-file-name)))
    (if handler
	(funcall handler 'byte-compiler-base-file-name filename)
      filename)))

Jim Blandy's avatar
Jim Blandy committed
159
(or (fboundp 'byte-compile-dest-file)
160
    ;; The user may want to redefine this along with emacs-lisp-file-regexp,
Jim Blandy's avatar
Jim Blandy committed
161
    ;; so only define it if it is undefined.
162 163
    ;; Note - redefining this function is obsolete as of 23.2.
    ;; Customize byte-compile-dest-file-function instead.
Jim Blandy's avatar
Jim Blandy committed
164
    (defun byte-compile-dest-file (filename)
165
      "Convert an Emacs Lisp source file name to a compiled file name.
166 167 168 169 170 171 172 173 174 175 176
If `byte-compile-dest-file-function' is non-nil, uses that
function to do the work.  Otherwise, if FILENAME matches
`emacs-lisp-file-regexp' (by default, files with the extension `.el'),
adds `c' to it; otherwise adds `.elc'."
      (if byte-compile-dest-file-function
	  (funcall byte-compile-dest-file-function filename)
	(setq filename (file-name-sans-versions
			(byte-compiler-base-file-name filename)))
	(cond ((string-match emacs-lisp-file-regexp filename)
	       (concat (substring filename 0 (match-beginning 0)) ".elc"))
	      (t (concat filename ".elc"))))))
Jim Blandy's avatar
Jim Blandy committed
177 178

;; This can be the 'byte-compile property of any symbol.
179
(autoload 'byte-compile-inline-expand "byte-opt")
Jim Blandy's avatar
Jim Blandy committed
180

Paul Eggert's avatar
Paul Eggert committed
181
;; This is the entry point to the lapcode optimizer pass1.
182
(autoload 'byte-optimize-form "byte-opt")
Paul Eggert's avatar
Paul Eggert committed
183
;; This is the entry point to the lapcode optimizer pass2.
184 185
(autoload 'byte-optimize-lapcode "byte-opt")
(autoload 'byte-compile-unfold-lambda "byte-opt")
Jim Blandy's avatar
Jim Blandy committed
186

187 188 189 190 191 192
;; This is the entry point to the decompiler, which is used by the
;; disassembler.  The disassembler just requires 'byte-compile, but
;; that doesn't define this function, so this seems to be a reasonable
;; thing to do.
(autoload 'byte-decompile-bytecode "byte-opt")

Richard M. Stallman's avatar
Richard M. Stallman committed
193
(defcustom byte-compile-verbose
Jim Blandy's avatar
Jim Blandy committed
194
  (and (not noninteractive) (> baud-rate search-slow-speed))
195
  "Non-nil means print messages describing progress of byte-compiler."
Richard M. Stallman's avatar
Richard M. Stallman committed
196 197
  :group 'bytecomp
  :type 'boolean)
Jim Blandy's avatar
Jim Blandy committed
198

Richard M. Stallman's avatar
Richard M. Stallman committed
199
(defcustom byte-optimize t
200
  "Enable optimization in the byte compiler.
201 202 203 204 205
Possible values are:
  nil      - no optimization
  t        - all optimizations
  `source' - source-level optimizations only
  `byte'   - code-level optimizations only"
Richard M. Stallman's avatar
Richard M. Stallman committed
206 207 208 209 210 211
  :group 'bytecomp
  :type '(choice (const :tag "none" nil)
		 (const :tag "all" t)
		 (const :tag "source-level" source)
		 (const :tag "byte-level" byte)))

212
(defcustom byte-compile-delete-errors nil
213
  "If non-nil, the optimizer may delete forms that may signal an error.
Richard M. Stallman's avatar
Richard M. Stallman committed
214 215 216
This includes variable references and calls to functions such as `car'."
  :group 'bytecomp
  :type 'boolean)
Jim Blandy's avatar
Jim Blandy committed
217

218
(defvar byte-compile-dynamic nil
Richard M. Stallman's avatar
Richard M. Stallman committed
219
  "If non-nil, compile function bodies so they load lazily.
220 221
They are hidden in comments in the compiled file,
and each one is brought into core when the
222 223 224 225 226 227 228 229
function is called.

To enable this option, make it a file-local variable
in the source file you want it to apply to.
For example, add  -*-byte-compile-dynamic: t;-*- on the first line.

When this option is true, if you load the compiled file and then move it,
the functions you loaded will not be able to run.")
230
;;;###autoload(put 'byte-compile-dynamic 'safe-local-variable 'booleanp)
231

232 233
(defvar byte-compile-disable-print-circle nil
  "If non-nil, disable `print-circle' on printing a byte-compiled code.")
234
(make-obsolete-variable 'byte-compile-disable-print-circle nil "24.1")
235 236
;;;###autoload(put 'byte-compile-disable-print-circle 'safe-local-variable 'booleanp)

Richard M. Stallman's avatar
Richard M. Stallman committed
237
(defcustom byte-compile-dynamic-docstrings t
238 239 240
  "If non-nil, compile doc strings for lazy access.
We bury the doc strings of functions and variables inside comments in
the file, and bring them into core only when they are actually needed.
241 242 243 244

When this option is true, if you load the compiled file and then move it,
you won't be able to find the documentation of anything in that file.

245 246 247 248 249
To disable this option for a certain file, make it a file-local variable
in the source file.  For example, add this to the first line:
  -*-byte-compile-dynamic-docstrings:nil;-*-
You can also set the variable globally.

Richard M. Stallman's avatar
Richard M. Stallman committed
250 251 252
This option is enabled by default because it reduces Emacs memory usage."
  :group 'bytecomp
  :type 'boolean)
253
;;;###autoload(put 'byte-compile-dynamic-docstrings 'safe-local-variable 'booleanp)
254

Glenn Morris's avatar
Glenn Morris committed
255 256 257
(defconst byte-compile-log-buffer "*Compile-Log*"
  "Name of the byte-compiler's log buffer.")

Richard M. Stallman's avatar
Richard M. Stallman committed
258
(defcustom byte-optimize-log nil
Glenn Morris's avatar
Glenn Morris committed
259
  "If non-nil, the byte-compiler will log its optimizations.
Jim Blandy's avatar
Jim Blandy committed
260
If this is 'source, then only source-level optimizations will be logged.
Glenn Morris's avatar
Glenn Morris committed
261 262
If it is 'byte, then only byte-level optimizations will be logged.
The information is logged to `byte-compile-log-buffer'."
Richard M. Stallman's avatar
Richard M. Stallman committed
263 264 265 266 267 268 269
  :group 'bytecomp
  :type '(choice (const :tag "none" nil)
		 (const :tag "all" t)
		 (const :tag "source-level" source)
		 (const :tag "byte-level" byte)))

(defcustom byte-compile-error-on-warn nil
270
  "If true, the byte-compiler reports warnings with `error'."
Richard M. Stallman's avatar
Richard M. Stallman committed
271 272
  :group 'bytecomp
  :type 'boolean)
Jim Blandy's avatar
Jim Blandy committed
273

274
(defconst byte-compile-warning-types
275
  '(redefine callargs free-vars unresolved
276
	     obsolete noruntime cl-functions interactive-only
277
	     make-local mapcar constants suspicious lexical)
278
  "The list of warning types used when `byte-compile-warnings' is t.")
Richard M. Stallman's avatar
Richard M. Stallman committed
279
(defcustom byte-compile-warnings t
280
  "List of warnings that the byte-compiler should issue (t for all).
281

282
Elements of the list may be:
Jim Blandy's avatar
Jim Blandy committed
283 284 285

  free-vars   references to variables not in the current lexical scope.
  unresolved  calls to unknown functions.
286 287
  callargs    function calls with args that don't match the definition.
  redefine    function name redefined from a macro to ordinary function or vice
Jim Blandy's avatar
Jim Blandy committed
288
              versa, or redefined to take a different number of arguments.
289 290 291
  obsolete    obsolete variables and functions.
  noruntime   functions that may not be defined at runtime (typically
              defined only under `eval-when-compile').
Juanma Barranquero's avatar
Juanma Barranquero committed
292
  cl-functions    calls to runtime functions from the CL package (as
293 294
		  distinguished from macros and aliases).
  interactive-only
295
	      commands that normally shouldn't be called from Lisp code.
Glenn Morris's avatar
Glenn Morris committed
296
  make-local  calls to make-variable-buffer-local that may be incorrect.
297
  mapcar      mapcar called for effect.
298
  constants   let-binding of, or assignment to, constants/nonvariables.
299
  suspicious  constructs that usually don't do what the coder wanted.
300 301 302

If the list begins with `not', then the remaining elements specify warnings to
suppress.  For example, (not mapcar) will suppress warnings about mapcar."
Richard M. Stallman's avatar
Richard M. Stallman committed
303
  :group 'bytecomp
304
  :type `(choice (const :tag "All" t)
305
		 (set :menu-tag "Some"
306 307
                      ,@(mapcar (lambda (x) `(const ,x))
                                byte-compile-warning-types))))
308

309
;;;###autoload
310 311 312 313
(put 'byte-compile-warnings 'safe-local-variable
     (lambda (v)
       (or (symbolp v)
           (null (delq nil (mapcar (lambda (x) (not (symbolp x))) v))))))
314

315 316 317 318 319 320 321 322 323 324 325
(defun byte-compile-warning-enabled-p (warning)
  "Return non-nil if WARNING is enabled, according to `byte-compile-warnings'."
  (or (eq byte-compile-warnings t)
      (if (eq (car byte-compile-warnings) 'not)
          (not (memq warning byte-compile-warnings))
        (memq warning byte-compile-warnings))))

;;;###autoload
(defun byte-compile-disable-warning (warning)
  "Change `byte-compile-warnings' to disable WARNING.
If `byte-compile-warnings' is t, set it to `(not WARNING)'.
Glenn Morris's avatar
Glenn Morris committed
326 327 328
Otherwise, if the first element is `not', add WARNING, else remove it.
Normally you should let-bind `byte-compile-warnings' before calling this,
else the global value will be modified."
329 330 331 332 333 334 335 336 337 338 339 340 341 342
  (setq byte-compile-warnings
        (cond ((eq byte-compile-warnings t)
               (list 'not warning))
              ((eq (car byte-compile-warnings) 'not)
               (if (memq warning byte-compile-warnings)
                   byte-compile-warnings
                 (append byte-compile-warnings (list warning))))
              (t
               (delq warning byte-compile-warnings)))))

;;;###autoload
(defun byte-compile-enable-warning (warning)
  "Change `byte-compile-warnings' to enable WARNING.
If `byte-compile-warnings' is `t', do nothing.  Otherwise, if the
Glenn Morris's avatar
Glenn Morris committed
343 344 345
first element is `not', remove WARNING, else add it.
Normally you should let-bind `byte-compile-warnings' before calling this,
else the global value will be modified."
346 347 348 349 350 351 352 353 354
  (or (eq byte-compile-warnings t)
      (setq byte-compile-warnings
            (cond ((eq (car byte-compile-warnings) 'not)
                   (delq warning byte-compile-warnings))
                  ((memq warning byte-compile-warnings)
                   byte-compile-warnings)
                  (t
                   (append byte-compile-warnings (list warning)))))))

355 356
(defvar byte-compile-interactive-only-functions
  '(beginning-of-buffer end-of-buffer replace-string replace-regexp
357
    insert-file insert-buffer insert-file-literally previous-line next-line
358
    goto-line comint-run delete-backward-char toggle-read-only)
359
  "List of commands that are not meant to be called from Lisp.")
Jim Blandy's avatar
Jim Blandy committed
360

361
(defvar byte-compile-not-obsolete-vars nil
362 363 364
  "List of variables that shouldn't be reported as obsolete.")
(defvar byte-compile-global-not-obsolete-vars nil
  "Global list of variables that shouldn't be reported as obsolete.")
365 366

(defvar byte-compile-not-obsolete-funcs nil
367
  "List of functions that shouldn't be reported as obsolete.")
Kenichi Handa's avatar
Kenichi Handa committed
368

Richard M. Stallman's avatar
Richard M. Stallman committed
369
(defcustom byte-compile-generate-call-tree nil
370
  "Non-nil means collect call-graph information when compiling.
371
This records which functions were called and from where.
372 373 374
If the value is t, compilation displays the call graph when it finishes.
If the value is neither t nor nil, compilation asks you whether to display
the graph.
Jim Blandy's avatar
Jim Blandy committed
375 376 377 378 379 380

The call tree only lists functions called, not macros used. Those functions
which the byte-code interpreter knows about directly (eq, cons, etc.) are
not reported.

The call tree also lists those functions which are not known to be called
Karl Heuer's avatar
Karl Heuer committed
381
\(that is, to which no calls have been compiled).  Functions which can be
Richard M. Stallman's avatar
Richard M. Stallman committed
382 383 384
invoked interactively are excluded from this list."
  :group 'bytecomp
  :type '(choice (const :tag "Yes" t) (const :tag "No" nil)
385
		 (other :tag "Ask" lambda)))
Jim Blandy's avatar
Jim Blandy committed
386

387 388
(defvar byte-compile-call-tree nil
  "Alist of functions and their call tree.
Jim Blandy's avatar
Jim Blandy committed
389 390 391 392 393 394 395 396
Each element looks like

  \(FUNCTION CALLERS CALLS\)

where CALLERS is a list of functions that call FUNCTION, and CALLS
is a list of functions for which calls were generated while compiling
FUNCTION.")

Richard M. Stallman's avatar
Richard M. Stallman committed
397
(defcustom byte-compile-call-tree-sort 'name
398
  "If non-nil, sort the call tree.
399
The values `name', `callers', `calls', `calls+callers'
Richard M. Stallman's avatar
Richard M. Stallman committed
400 401 402 403
specify different fields to sort on."
  :group 'bytecomp
  :type '(choice (const name) (const callers) (const calls)
		 (const calls+callers) (const nil)))
404

405
(defvar byte-compile-debug nil)
Jim Blandy's avatar
Jim Blandy committed
406
(defvar byte-compile-constants nil
407
  "List of all constants encountered during compilation of this form.")
Jim Blandy's avatar
Jim Blandy committed
408
(defvar byte-compile-variables nil
409
  "List of all variables encountered during compilation of this form.")
Jim Blandy's avatar
Jim Blandy committed
410
(defvar byte-compile-bound-variables nil
411
  "List of dynamic variables bound in the context of the current form.
412
This list lives partly on the stack.")
413 414
(defvar byte-compile-const-variables nil
  "List of variables declared as constants during compilation of this file.")
Jim Blandy's avatar
Jim Blandy committed
415 416 417
(defvar byte-compile-free-references)
(defvar byte-compile-free-assignments)

Richard M. Stallman's avatar
Richard M. Stallman committed
418 419
(defvar byte-compiler-error-flag)

Jim Blandy's avatar
Jim Blandy committed
420
(defconst byte-compile-initial-macro-environment
421 422 423
  '(
;;     (byte-compiler-options . (lambda (&rest forms)
;; 			       (apply 'byte-compiler-options-handler forms)))
424
    (declare-function . byte-compile-macroexpand-declare-function)
Jim Blandy's avatar
Jim Blandy committed
425
    (eval-when-compile . (lambda (&rest body)
426 427 428
			   (list
			    'quote
			    (byte-compile-eval
429
                             (byte-compile-top-level
430
                              (byte-compile-preprocess (cons 'progn body)))))))
Jim Blandy's avatar
Jim Blandy committed
431
    (eval-and-compile . (lambda (&rest body)
432
			  (byte-compile-eval-before-compile (cons 'progn body))
Jim Blandy's avatar
Jim Blandy committed
433 434 435 436 437 438
			  (cons 'progn body))))
  "The default macro-environment passed to macroexpand by the compiler.
Placing a macro here will cause a macro to have different semantics when
expanded by the compiler as when expanded by the interpreter.")

(defvar byte-compile-macro-environment byte-compile-initial-macro-environment
439 440
  "Alist of macros defined in the file being compiled.
Each element looks like (MACRONAME . DEFINITION).  It is
441
\(MACRONAME . nil) when a macro is redefined as a function.")
Jim Blandy's avatar
Jim Blandy committed
442 443

(defvar byte-compile-function-environment nil
444 445 446
  "Alist of functions defined in the file being compiled.
This is so we can inline them when necessary.
Each element looks like (FUNCTIONNAME . DEFINITION).  It is
Richard M. Stallman's avatar
Richard M. Stallman committed
447 448
\(FUNCTIONNAME . nil) when a function is redefined as a macro.
It is \(FUNCTIONNAME . t) when all we know is that it was defined,
449 450
and we don't know the definition.  For an autoloaded function, DEFINITION
has the form (autoload . FILENAME).")
Jim Blandy's avatar
Jim Blandy committed
451 452

(defvar byte-compile-unresolved-functions nil
453
  "Alist of undefined functions to which calls have been compiled.
454 455
This variable is only significant whilst compiling an entire buffer.
Used for warnings when a function is not known to be defined or is later
456
defined with incorrect args.")
Jim Blandy's avatar
Jim Blandy committed
457

Kenichi Handa's avatar
Kenichi Handa committed
458 459 460 461 462
(defvar byte-compile-noruntime-functions nil
  "Alist of functions called that may not be defined when the compiled code is run.
Used for warnings about calling a function that is defined during compilation
but won't necessarily be defined when the compiled file is loaded.")

463
;; Variables for lexical binding
464
(defvar byte-compile--lexical-environment nil
465 466
  "The current lexical environment.")

Jim Blandy's avatar
Jim Blandy committed
467 468 469 470 471 472 473 474 475 476
(defvar byte-compile-tag-number 0)
(defvar byte-compile-output nil
  "Alist describing contents to put in byte code string.
Each element is (INDEX . VALUE)")
(defvar byte-compile-depth 0 "Current depth of execution stack.")
(defvar byte-compile-maxdepth 0 "Maximum depth of execution stack.")


;;; The byte codes; this information is duplicated in bytecomp.c

477
(defvar byte-code-vector nil
Jim Blandy's avatar
Jim Blandy committed
478 479
  "An array containing byte-code names indexed by byte-code values.")

480
(defvar byte-stack+-info nil
Jim Blandy's avatar
Jim Blandy committed
481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507
  "An array with the stack adjustment for each byte-code.")

(defmacro byte-defop (opcode stack-adjust opname &optional docstring)
  ;; This is a speed-hack for building the byte-code-vector at compile-time.
  ;; We fill in the vector at macroexpand-time, and then after the last call
  ;; to byte-defop, we write the vector out as a constant instead of writing
  ;; out a bunch of calls to aset.
  ;; Actually, we don't fill in the vector itself, because that could make
  ;; it problematic to compile big changes to this compiler; we store the
  ;; values on its plist, and remove them later in -extrude.
  (let ((v1 (or (get 'byte-code-vector 'tmp-compile-time-value)
		(put 'byte-code-vector 'tmp-compile-time-value
		     (make-vector 256 nil))))
	(v2 (or (get 'byte-stack+-info 'tmp-compile-time-value)
		(put 'byte-stack+-info 'tmp-compile-time-value
		     (make-vector 256 nil)))))
    (aset v1 opcode opname)
    (aset v2 opcode stack-adjust))
  (if docstring
      (list 'defconst opname opcode (concat "Byte code opcode " docstring "."))
      (list 'defconst opname opcode)))

(defmacro byte-extrude-byte-code-vectors ()
  (prog1 (list 'setq 'byte-code-vector
		     (get 'byte-code-vector 'tmp-compile-time-value)
		     'byte-stack+-info
		     (get 'byte-stack+-info 'tmp-compile-time-value))
508 509
    (put 'byte-code-vector 'tmp-compile-time-value nil)
    (put 'byte-stack+-info 'tmp-compile-time-value nil)))
Jim Blandy's avatar
Jim Blandy committed
510 511 512 513 514


;; These opcodes are special in that they pack their argument into the
;; opcode word.
;;
515
(byte-defop   0  1 byte-stack-ref "for stack reference")
Jim Blandy's avatar
Jim Blandy committed
516 517 518 519 520
(byte-defop   8  1 byte-varref	"for variable reference")
(byte-defop  16 -1 byte-varset	"for setting a variable")
(byte-defop  24 -1 byte-varbind	"for binding a variable")
(byte-defop  32  0 byte-call	"for calling a function")
(byte-defop  40  0 byte-unbind	"for unbinding special bindings")
521
;; codes 8-47 are consumed by the preceding opcodes
Jim Blandy's avatar
Jim Blandy committed
522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581

;; unused: 48-55

(byte-defop  56 -1 byte-nth)
(byte-defop  57  0 byte-symbolp)
(byte-defop  58  0 byte-consp)
(byte-defop  59  0 byte-stringp)
(byte-defop  60  0 byte-listp)
(byte-defop  61 -1 byte-eq)
(byte-defop  62 -1 byte-memq)
(byte-defop  63  0 byte-not)
(byte-defop  64  0 byte-car)
(byte-defop  65  0 byte-cdr)
(byte-defop  66 -1 byte-cons)
(byte-defop  67  0 byte-list1)
(byte-defop  68 -1 byte-list2)
(byte-defop  69 -2 byte-list3)
(byte-defop  70 -3 byte-list4)
(byte-defop  71  0 byte-length)
(byte-defop  72 -1 byte-aref)
(byte-defop  73 -2 byte-aset)
(byte-defop  74  0 byte-symbol-value)
(byte-defop  75  0 byte-symbol-function) ; this was commented out
(byte-defop  76 -1 byte-set)
(byte-defop  77 -1 byte-fset) ; this was commented out
(byte-defop  78 -1 byte-get)
(byte-defop  79 -2 byte-substring)
(byte-defop  80 -1 byte-concat2)
(byte-defop  81 -2 byte-concat3)
(byte-defop  82 -3 byte-concat4)
(byte-defop  83  0 byte-sub1)
(byte-defop  84  0 byte-add1)
(byte-defop  85 -1 byte-eqlsign)
(byte-defop  86 -1 byte-gtr)
(byte-defop  87 -1 byte-lss)
(byte-defop  88 -1 byte-leq)
(byte-defop  89 -1 byte-geq)
(byte-defop  90 -1 byte-diff)
(byte-defop  91  0 byte-negate)
(byte-defop  92 -1 byte-plus)
(byte-defop  93 -1 byte-max)
(byte-defop  94 -1 byte-min)
(byte-defop  95 -1 byte-mult) ; v19 only
(byte-defop  96  1 byte-point)
(byte-defop  98  0 byte-goto-char)
(byte-defop  99  0 byte-insert)
(byte-defop 100  1 byte-point-max)
(byte-defop 101  1 byte-point-min)
(byte-defop 102  0 byte-char-after)
(byte-defop 103  1 byte-following-char)
(byte-defop 104  1 byte-preceding-char)
(byte-defop 105  1 byte-current-column)
(byte-defop 106  0 byte-indent-to)
(byte-defop 107  0 byte-scan-buffer-OBSOLETE) ; no longer generated as of v18
(byte-defop 108  1 byte-eolp)
(byte-defop 109  1 byte-eobp)
(byte-defop 110  1 byte-bolp)
(byte-defop 111  1 byte-bobp)
(byte-defop 112  1 byte-current-buffer)
(byte-defop 113  0 byte-set-buffer)
582 583
(byte-defop 114  0 byte-save-current-buffer
  "To make a binding to record the current buffer")
Jim Blandy's avatar
Jim Blandy committed
584
(byte-defop 115  0 byte-set-mark-OBSOLETE)
585
(byte-defop 116  1 byte-interactive-p-OBSOLETE)
Jim Blandy's avatar
Jim Blandy committed
586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608

;; These ops are new to v19
(byte-defop 117  0 byte-forward-char)
(byte-defop 118  0 byte-forward-word)
(byte-defop 119 -1 byte-skip-chars-forward)
(byte-defop 120 -1 byte-skip-chars-backward)
(byte-defop 121  0 byte-forward-line)
(byte-defop 122  0 byte-char-syntax)
(byte-defop 123 -1 byte-buffer-substring)
(byte-defop 124 -1 byte-delete-region)
(byte-defop 125 -1 byte-narrow-to-region)
(byte-defop 126  1 byte-widen)
(byte-defop 127  0 byte-end-of-line)

;; unused: 128

;; These store their argument in the next two bytes
(byte-defop 129  1 byte-constant2
   "for reference to a constant with vector index >= byte-constant-limit")
(byte-defop 130  0 byte-goto "for unconditional jump")
(byte-defop 131 -1 byte-goto-if-nil "to pop value and jump if it's nil")
(byte-defop 132 -1 byte-goto-if-not-nil "to pop value and jump if it's not nil")
(byte-defop 133 -1 byte-goto-if-nil-else-pop
Dave Love's avatar
Dave Love committed
609
  "to examine top-of-stack, jump and don't pop it if it's nil,
Jim Blandy's avatar
Jim Blandy committed
610 611
otherwise pop it")
(byte-defop 134 -1 byte-goto-if-not-nil-else-pop
Dave Love's avatar
Dave Love committed
612
  "to examine top-of-stack, jump and don't pop it if it's non nil,
Jim Blandy's avatar
Jim Blandy committed
613 614 615 616 617 618 619 620
otherwise pop it")

(byte-defop 135 -1 byte-return "to pop a value and return it from `byte-code'")
(byte-defop 136 -1 byte-discard "to discard one value from stack")
(byte-defop 137  1 byte-dup     "to duplicate the top of the stack")

(byte-defop 138  0 byte-save-excursion
  "to make a binding to record the buffer, point and mark")
621 622
(byte-defop 139  0 byte-save-window-excursion-OBSOLETE
  "to make a binding to record entire window configuration")
Jim Blandy's avatar
Jim Blandy committed
623 624 625 626 627 628 629
(byte-defop 140  0 byte-save-restriction
  "to make a binding to record the current buffer clipping restrictions")
(byte-defop 141 -1 byte-catch
  "for catch.  Takes, on stack, the tag and an expression for the body")
(byte-defop 142 -1 byte-unwind-protect
  "for unwind-protect.  Takes, on stack, an expression for the unwind-action")

Dave Love's avatar
Dave Love committed
630
;; For condition-case.  Takes, on stack, the variable to bind,
631 632
;; an expression for the body, and a list of clauses.
(byte-defop 143 -2 byte-condition-case)
Jim Blandy's avatar
Jim Blandy committed
633

634 635
(byte-defop 144  0 byte-temp-output-buffer-setup-OBSOLETE)
(byte-defop 145 -1 byte-temp-output-buffer-show-OBSOLETE)
Jim Blandy's avatar
Jim Blandy committed
636 637

;; these ops are new to v19
638 639

;; To unbind back to the beginning of this frame.
640
;; Not used yet, but will be needed for tail-recursion elimination.
641
(byte-defop 146  0 byte-unbind-all)
Jim Blandy's avatar
Jim Blandy committed
642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666

;; these ops are new to v19
(byte-defop 147 -2 byte-set-marker)
(byte-defop 148  0 byte-match-beginning)
(byte-defop 149  0 byte-match-end)
(byte-defop 150  0 byte-upcase)
(byte-defop 151  0 byte-downcase)
(byte-defop 152 -1 byte-string=)
(byte-defop 153 -1 byte-string<)
(byte-defop 154 -1 byte-equal)
(byte-defop 155 -1 byte-nthcdr)
(byte-defop 156 -1 byte-elt)
(byte-defop 157 -1 byte-member)
(byte-defop 158 -1 byte-assq)
(byte-defop 159  0 byte-nreverse)
(byte-defop 160 -1 byte-setcar)
(byte-defop 161 -1 byte-setcdr)
(byte-defop 162  0 byte-car-safe)
(byte-defop 163  0 byte-cdr-safe)
(byte-defop 164 -1 byte-nconc)
(byte-defop 165 -1 byte-quo)
(byte-defop 166 -1 byte-rem)
(byte-defop 167  0 byte-numberp)
(byte-defop 168  0 byte-integerp)

Jim Blandy's avatar
Jim Blandy committed
667
;; unused: 169-174
Jim Blandy's avatar
Jim Blandy committed
668 669 670 671
(byte-defop 175 nil byte-listN)
(byte-defop 176 nil byte-concatN)
(byte-defop 177 nil byte-insertN)

672 673
(byte-defop 178 -1 byte-stack-set)	; Stack offset in following one byte.
(byte-defop 179 -1 byte-stack-set2)	; Stack offset in following two bytes.
674

675
;; If (following one byte & 0x80) == 0
676 677
;;    discard (following one byte & 0x7F) stack entries
;; else
678
;;    discard (following one byte & 0x7F) stack entries _underneath_ TOS
679 680 681 682 683 684 685 686
;;    (that is, if the operand = 0x83,  ... X Y Z T  =>  ... T)
(byte-defop 182 nil byte-discardN)
;; `byte-discardN-preserve-tos' is a pseudo-op that gets turned into
;; `byte-discardN' with the high bit in the operand set (by
;; `byte-compile-lapcode').
(defconst byte-discardN-preserve-tos byte-discardN)

;; unused: 182-191
Jim Blandy's avatar
Jim Blandy committed
687 688 689 690 691 692 693 694 695

(byte-defop 192  1 byte-constant	"for reference to a constant")
;; codes 193-255 are consumed by byte-constant.
(defconst byte-constant-limit 64
  "Exclusive maximum index usable in the `byte-constant' opcode.")

(defconst byte-goto-ops '(byte-goto byte-goto-if-nil byte-goto-if-not-nil
			  byte-goto-if-nil-else-pop
			  byte-goto-if-not-nil-else-pop)
696
  "List of byte-codes whose offset is a pc.")
Jim Blandy's avatar
Jim Blandy committed
697 698 699 700 701 702

(defconst byte-goto-always-pop-ops '(byte-goto-if-nil byte-goto-if-not-nil))

(byte-extrude-byte-code-vectors)

;;; lapcode generator
703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731
;;
;; the byte-compiler now does source -> lapcode -> bytecode instead of
;; source -> bytecode, because it's a lot easier to make optimizations
;; on lapcode than on bytecode.
;;
;; Elements of the lapcode list are of the form (<instruction> . <parameter>)
;; where instruction is a symbol naming a byte-code instruction,
;; and parameter is an argument to that instruction, if any.
;;
;; The instruction can be the pseudo-op TAG, which means that this position
;; in the instruction stream is a target of a goto.  (car PARAMETER) will be
;; the PC for this location, and the whole instruction "(TAG pc)" will be the
;; parameter for some goto op.
;;
;; If the operation is varbind, varref, varset or push-constant, then the
;; parameter is (variable/constant . index_in_constant_vector).
;;
;; First, the source code is macroexpanded and optimized in various ways.
;; Then the resultant code is compiled into lapcode.  Another set of
;; optimizations are then run over the lapcode.  Then the variables and
;; constants referenced by the lapcode are collected and placed in the
;; constants-vector.  (This happens now so that variables referenced by dead
;; code don't consume space.)  And finally, the lapcode is transformed into
;; compacted byte-code.
;;
;; A distinction is made between variables and constants because the variable-
;; referencing instructions are more sensitive to the variables being near the
;; front of the constants-vector than the constant-referencing instructions.
;; Also, this lets us notice references to free variables.
Jim Blandy's avatar
Jim Blandy committed
732

733 734 735 736 737 738 739 740
(defmacro byte-compile-push-bytecodes (&rest args)
  "Push BYTE... onto BYTES, and increment PC by the number of bytes pushed.
ARGS is of the form (BYTE... BYTES PC), where BYTES and PC are variable names.
BYTES and PC are updated after evaluating all the arguments."
  (let ((byte-exprs (butlast args 2))
	(bytes-var (car (last args 2)))
	(pc-var (car (last args))))
    `(setq ,bytes-var ,(if (null (cdr byte-exprs))
741 742 743 744
                           `(progn (assert (<= 0 ,(car byte-exprs)))
                                   (cons ,@byte-exprs ,bytes-var))
                         `(nconc (list ,@(reverse byte-exprs)) ,bytes-var))
           ,pc-var (+ ,(length byte-exprs) ,pc-var))))
745 746 747

(defmacro byte-compile-push-bytecode-const2 (opcode const2 bytes pc)
  "Push OPCODE and the two-byte constant CONST2 onto BYTES, and add 3 to PC.
Paul Eggert's avatar
Paul Eggert committed
748
CONST2 may be evaluated multiple times."
749 750 751
  `(byte-compile-push-bytecodes ,opcode (logand ,const2 255) (lsh ,const2 -8)
				,bytes ,pc))

Jim Blandy's avatar
Jim Blandy committed
752 753 754 755 756
(defun byte-compile-lapcode (lap)
  "Turns lapcode into bytecode.  The lapcode is destroyed."
  ;; Lapcode modifications: changes the ID of a tag to be the tag's PC.
  (let ((pc 0)			; Program counter
	op off			; Operation & offset
757
	opcode			; numeric value of OP
Jim Blandy's avatar
Jim Blandy committed
758
	(bytes '())		; Put the output bytes here
759 760 761 762
	(patchlist nil))	; List of gotos to patch
    (dolist (lap-entry lap)
      (setq op (car lap-entry)
	    off (cdr lap-entry))
763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778
      (cond
       ((not (symbolp op))
        (error "Non-symbolic opcode `%s'" op))
       ((eq op 'TAG)
        (setcar off pc))
       (t
        (setq opcode
              (if (eq op 'byte-discardN-preserve-tos)
                  ;; byte-discardN-preserve-tos is a pseudo op, which
                  ;; is actually the same as byte-discardN
                  ;; with a modified argument.
                  byte-discardN
                (symbol-value op)))
        (cond ((memq op byte-goto-ops)
               ;; goto
               (byte-compile-push-bytecodes opcode nil (cdr off) bytes pc)
779
               (push bytes patchlist))
Stefan Monnier's avatar
Stefan Monnier committed
780 781 782 783 784
              ((or (and (consp off)
                        ;; Variable or constant reference
                        (progn
                          (setq off (cdr off))
                          (eq op 'byte-constant)))
785
                   (and (eq op 'byte-constant)
Stefan Monnier's avatar
Stefan Monnier committed
786
                        (integerp off)))
787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803
               ;; constant ref
               (if (< off byte-constant-limit)
                   (byte-compile-push-bytecodes (+ byte-constant off)
                                                bytes pc)
                 (byte-compile-push-bytecode-const2 byte-constant2 off
                                                    bytes pc)))
              ((and (= opcode byte-stack-set)
                    (> off 255))
               ;; Use the two-byte version of byte-stack-set if the
               ;; offset is too large for the normal version.
               (byte-compile-push-bytecode-const2 byte-stack-set2 off
                                                  bytes pc))
              ((and (>= opcode byte-listN)
                    (< opcode byte-discardN))
               ;; These insns all put their operand into one extra byte.
               (byte-compile-push-bytecodes opcode off bytes pc))
              ((= opcode byte-discardN)
804
               ;; byte-discardN is weird in that it encodes a flag in the
805 806 807 808
               ;; top bit of its one-byte argument.  If the argument is
               ;; too large to fit in 7 bits, the opcode can be repeated.
               (let ((flag (if (eq op 'byte-discardN-preserve-tos) #x80 0)))
                 (while (> off #x7f)
809 810
                   (byte-compile-push-bytecodes opcode (logior #x7f flag)
                                                bytes pc)
811
                   (setq off (- off #x7f)))
812 813
                 (byte-compile-push-bytecodes opcode (logior off flag)
                                              bytes pc)))
814 815 816
              ((null off)
               ;; opcode that doesn't use OFF
               (byte-compile-push-bytecodes opcode bytes pc))
817 818 819 820
              ((and (eq opcode byte-stack-ref) (eq off 0))
               ;; (stack-ref 0) is really just another name for `dup'.
               (debug)                 ;FIXME: When would this happen?
               (byte-compile-push-bytecodes byte-dup bytes pc))
821 822 823 824 825 826 827 828 829 830
              ;; The following three cases are for the special
              ;; insns that encode their operand into 0, 1, or 2
              ;; extra bytes depending on its magnitude.
              ((< off 6)
               (byte-compile-push-bytecodes (+ opcode off) bytes pc))
              ((< off 256)
               (byte-compile-push-bytecodes (+ opcode 6) off bytes pc))
              (t
               (byte-compile-push-bytecode-const2 (+ opcode 7) off
                                                  bytes pc))))))
Jim Blandy's avatar
Jim Blandy committed
831
    ;;(if (not (= pc (length bytes)))
832
    ;;    (error "Compiler error: pc mismatch - %s %s" pc (length bytes)))
833
    ;; Patch tag PCs into absolute jumps.
834
    (dolist (bytes-tail patchlist)
835
      (setq pc (caar bytes-tail))	; Pick PC from goto's tag.
836 837 838
      (setcar (cdr bytes-tail) (logand pc 255))
      (setcar bytes-tail (lsh pc -8))
      ;; FIXME: Replace this by some workaround.
839
      (if (> (car bytes-tail) 255) (error "Bytecode overflow")))
840

Kenichi Handa's avatar
Kenichi Handa committed
841
    (apply 'unibyte-string (nreverse bytes))))
Jim Blandy's avatar
Jim Blandy committed
842

843 844 845

;;; compile-time evaluation

846 847 848 849 850
(defun byte-compile-cl-file-p (file)
  "Return non-nil if FILE is one of the CL files."
  (and (stringp file)
       (string-match "^cl\\>" (file-name-nondirectory file))))

851 852
(defun byte-compile-eval (form)
  "Eval FORM and mark the functions defined therein.
Kenichi Handa's avatar
Kenichi Handa committed
853
Each function's symbol gets added to `byte-compile-noruntime-functions'."
854 855
  (let ((hist-orig load-history)
	(hist-nil-orig current-load-list))
856
    (prog1 (eval form lexical-binding)
857
      (when (byte-compile-warning-enabled-p 'noruntime)
858 859
	(let ((hist-new load-history)
	      (hist-nil-new current-load-list))
860 861 862
	  ;; Go through load-history, look for newly loaded files
	  ;; and mark all the functions defined therein.
	  (while (and hist-new (not (eq hist-new hist-orig)))
863 864
	    (let ((xs (pop hist-new))
		  old-autoloads)
865
	      ;; Make sure the file was not already loaded before.
866
	      (unless (or (assoc (car xs) hist-orig)
867 868 869 870 871 872 873 874 875
			  ;; Don't give both the "noruntime" and
			  ;; "cl-functions" warning for the same function.
			  ;; FIXME This seems incorrect - these are two
			  ;; independent warnings.  For example, you may be
			  ;; choosing to see the cl warnings but ignore them.
			  ;; You probably don't want to ignore noruntime in the
			  ;; same way.
			  (and (byte-compile-warning-enabled-p 'cl-functions)
			       (byte-compile-cl-file-p (car xs))))
876 877
		(dolist (s xs)
		  (cond
878 879
		   ((symbolp s)
		    (unless (memq s old-autoloads)
Kenichi Handa's avatar
Kenichi Handa committed
880
		      (push s byte-compile-noruntime-functions)))
881
		   ((and (consp s) (eq t (car s)))
882
		    (push (cdr s) old-autoloads))
883
		   ((and (consp s) (eq 'autoload (car s)))
Kenichi Handa's avatar
Kenichi Handa committed
884
		    (push (cdr s) byte-compile-noruntime-functions)))))))
885
	  ;; Go through current-load-list for the locally defined funs.
886 887 888 889
	  (let (old-autoloads)
	    (while (and hist-nil-new (not (eq hist-nil-new hist-nil-orig)))
	      (let ((s (pop hist-nil-new)))
		(when (and (symbolp s) (not (memq s old-autoloads)))
Kenichi Handa's avatar
Kenichi Handa committed
890
		  (push s byte-compile-noruntime-functions))
891
		(when (and (consp s) (eq t (car s)))
892
		  (push (cdr s) old-autoloads)))))))
893
      (when (byte-compile-warning-enabled-p 'cl-functions)
894
	(let ((hist-new load-history))
895 896 897 898 899 900 901 902 903
	  ;; Go through load-history, looking for the cl files.
	  ;; Since new files are added at the start of load-history,
	  ;; we scan the new history until the tail matches the old.
	  (while (and (not byte-compile-cl-functions)
		      hist-new (not (eq hist-new hist-orig)))
	    ;; We used to check if the file had already been loaded,
	    ;; but it is better to check non-nil byte-compile-cl-functions.
	    (and (byte-compile-cl-file-p (car (pop hist-new)))
		 (byte-compile-find-cl-functions))))))))
904

905 906 907
(defun byte-compile-eval-before-compile (form)
  "Evaluate FORM for `eval-and-compile'."
  (let ((hist-nil-orig current-load-list))
908
    (prog1 (eval form lexical-binding)
909
      ;; (eval-and-compile (require 'cl) turns off warnings for cl functions.
910 911
      ;; FIXME Why does it do that - just as a hack?
      ;; There are other ways to do this nowadays.
912 913 914
      (let ((tem current-load-list))
	(while (not (eq tem hist-nil-orig))
	  (when (equal (car tem) '(require . cl))
915
            (byte-compile-disable-warning 'cl-functions))
916
	  (setq tem (cdr tem)))))))
Jim Blandy's avatar
Jim Blandy committed
917 918 919

;;; byte compiler messages

920 921
(defvar byte-compile-current-form nil)
(defvar byte-compile-dest-file nil)
922
(defvar byte-compile-current-file nil)
923
(defvar byte-compile-current-group nil)
924
(defvar byte-compile-current-buffer nil)
925

Richard M. Stallman's avatar
Richard M. Stallman committed
926
;; Log something that isn't a warning.
Jim Blandy's avatar
Jim Blandy committed
927
(defmacro byte-compile-log (format-string &rest args)
928 929 930 931 932 933 934 935 936 937 938 939
  `(and
    byte-optimize
    (memq byte-optimize-log '(t source))
    (let ((print-escape-newlines t)
	  (print-level 4)
	  (print-length 4))
      (byte-compile-log-1
       (format
	,format-string
	,@(mapcar
	   (lambda (x) (if (symbolp x) (list 'prin1-to-string x) x))
	   args))))))
Jim Blandy's avatar
Jim Blandy committed
940

Richard M. Stallman's avatar
Richard M. Stallman committed
941 942
;; Log something that isn't a warning.
(defun byte-compile-log-1 (string)
Glenn Morris's avatar
Glenn Morris committed
943
  (with-current-buffer byte-compile-log-buffer
944 945 946 947 948 949 950
    (let ((inhibit-read-only t))
      (goto-char (point-max))
      (byte-compile-warning-prefix nil nil)
      (cond (noninteractive
	     (message " %s" string))
	    (t
	     (insert (format "%s\n" string)))))))
Jim Blandy's avatar
Jim Blandy committed
951

952 953 954 955 956 957
(defvar byte-compile-read-position nil
  "Character position we began the last `read' from.")
(defvar byte-compile-last-position nil
  "Last known character position in the input.")

;; copied from gnus-util.el
958
(defsubst byte-compile-delete-first (elt list)
959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976
  (if (eq (car list) elt)
      (cdr list)
    (let ((total list))
      (while (and (cdr list)
		  (not (eq (cadr list) elt)))
	(setq list (cdr list)))
      (when (cdr list)
	(setcdr list (cddr list)))
      total)))

;; The purpose of this function is to iterate through the
;; `read-symbol-positions-list'.  Each time we process, say, a
;; function definition (`defun') we remove `defun' from
;; `read-symbol-positions-list', and set `byte-compile-last-position'
;; to that symbol's character position.  Similarly, if we encounter a
;; variable reference, like in (1+ foo), we remove `foo' from the
;; list.  If our current position is after the symbol's position, we
;; assume we've already passed that point, and look for the next
Juanma Barranquero's avatar
Juanma Barranquero committed
977
;; occurrence of the symbol.
978 979 980 981 982 983 984
;;
;; This function should not be called twice for the same occurrence of
;; a symbol, and it should not be called for symbols generated by the
;; byte compiler itself; because rather than just fail looking up the
;; symbol, we may find an occurrence of the symbol further ahead, and
;; then `byte-compile-last-position' as advanced too far.
;;
Juanma Barranquero's avatar
Juanma Barranquero committed
985
;; So your're probably asking yourself: Isn't this function a
986 987 988
;; gross hack?  And the answer, of course, would be yes.
(defun byte-compile-set-symbol-position (sym &optional allow-previous)
  (when byte-compile-read-position
989
    (let (last entry)
990
      (while (progn
991 992 993 994 995 996 997 998
	       (setq last byte-compile-last-position
		     entry (assq sym read-symbol-positions-list))
	       (when entry
		 (setq byte-compile-last-position
		       (+ byte-compile-read-position (cdr entry))
		       read-symbol-positions-list
		       (byte-compile-delete-first
			entry read-symbol-positions-list)))
999 1000
	       (or (and allow-previous
                        (not (= last byte-compile-last-position)))
1001
		   (> last byte-compile-last-position)))))))
1002

Richard M. Stallman's avatar
Richard M. Stallman committed
1003 1004
(defvar byte-compile-last-warned-form nil)
(defvar byte-compile-last-logged-file nil)
1005 1006
(defvar byte-compile-root-dir nil
  "Directory relative to which file names in error messages are written.")
Richard M. Stallman's avatar
Richard M. Stallman committed
1007 1008

;; This is used as warning-prefix for the compiler.
1009
;; It is always called with the warnings buffer current.
Richard M. Stallman's avatar
Richard M. Stallman committed
1010
(defun byte-compile-warning-prefix (level entry)
1011
  (let* ((inhibit-read-only t)
1012
	 (dir (or byte-compile-root-dir default-directory))
1013
	 (file (cond ((stringp byte-compile-current-file)
1014 1015
		      (format "%s:" (file-relative-name
                                     byte-compile-current-file dir)))