bytecomp.el 125 KB
Newer Older
1 2
;;; bytecomp.el --- compilation of Lisp code into byte code.

Karl Heuer's avatar
Karl Heuer committed
3
;;; Copyright (C) 1985, 1986, 1987, 1992, 1994 Free Software Foundation, Inc.
Eric S. Raymond's avatar
Eric S. Raymond committed
4

5 6 7
;; Author: Jamie Zawinski <jwz@lucid.com>
;;	Hallvard Furuseth <hbf@ulrik.uio.no>
;; Keywords: internal
Jim Blandy's avatar
Jim Blandy committed
8

9
;; Subsequently modified by RMS.
Jim Blandy's avatar
Jim Blandy committed
10

11
;;; This version incorporates changes up to version 2.10 of the 
Jim Blandy's avatar
Jim Blandy committed
12
;;; Zawinski-Furuseth compiler.
13
(defconst byte-compile-version "FSF 2.10")
Jim Blandy's avatar
Jim Blandy committed
14 15 16 17 18

;; This file is part of GNU Emacs.

;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
19
;; the Free Software Foundation; either version 2, or (at your option)
Jim Blandy's avatar
Jim Blandy committed
20 21 22 23 24 25 26 27 28 29 30
;; any later version.

;; 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
;; along with GNU Emacs; see the file COPYING.  If not, write to
;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.

31 32 33 34 35 36
;;; Commentary:

;; The Emacs Lisp byte compiler.  This crunches lisp source into a sort
;; of p-code which takes up less space and can be interpreted faster.
;; The user entry points are byte-compile-file and byte-recompile-directory.

37 38
;;; Code:

Jim Blandy's avatar
Jim Blandy committed
39 40
;;; ========================================================================
;;; Entry points:
41 42 43
;;;	byte-recompile-directory, byte-compile-file,
;;;     batch-byte-compile, batch-byte-recompile-directory,
;;;	byte-compile, compile-defun,
44 45 46
;;;	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.)
Jim Blandy's avatar
Jim Blandy committed
47

48
;;; This version of the byte compiler has the following improvements:
Jim Blandy's avatar
Jim Blandy committed
49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99
;;;  + 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;
;;;    - functions being called which are not defined globally, in the 
;;;      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.

;;; User customization variables:
;;;
;;; byte-compile-verbose	Whether to report the function currently being
;;;				compiled in the minibuffer;
;;; byte-optimize		Whether to do optimizations; this may be 
;;;				t, nil, 'source, or 'byte;
;;; byte-optimize-log		Whether to report (in excruciating detail) 
;;;				exactly which optimizations have been made.
;;;				This may be t, nil, 'source, or 'byte;
;;; byte-compile-error-on-warn	Whether to stop compilation when a warning is
;;;				produced;
;;; byte-compile-delete-errors	Whether the optimizer may delete calls or
;;;				variable references that are side-effect-free
;;;				except that they may return an error.
;;; byte-compile-generate-call-tree	Whether to generate a histogram of
;;;				function calls.  This can be useful for 
;;;				finding unused functions, as well as simple
;;;				performance metering.
;;; byte-compile-warnings	List of warnings to issue, or t.  May contain
;;;				'free-vars (references to variables not in the
;;;					    current lexical scope)
;;;				'unresolved (calls to unknown functions)
;;;				'callargs  (lambda calls with args that don't
;;;					    match the lambda's definition)
;;;				'redefine  (function cell redefined from
;;;					    a macro to a lambda or vice versa,
;;;					    or redefined to take other args)
100
;;;				'obsolete  (obsolete variables and functions)
101
;;; byte-compile-compatibility	Whether the compiler should
Jim Blandy's avatar
Jim Blandy committed
102
;;;				generate .elc files which can be loaded into
103
;;;				generic emacs 18.
104
;;; emacs-lisp-file-regexp	Regexp for the extension of source-files;
105
;;;				see also the function byte-compile-dest-file.
Jim Blandy's avatar
Jim Blandy committed
106 107 108 109 110 111

;;; 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
112
;;;	spliced in.  Lisp functions calls are very slow, so this can be a
Jim Blandy's avatar
Jim Blandy committed
113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137
;;;	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...
;;;		(inline			;;  `foo' and `baz' will be 
;;;		 (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
;;;	in without having to load that file before compiling it.  the
;;;	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
138
;;;     is analogous to the Common Lisp idiom (eval-when (compile) ...).
Jim Blandy's avatar
Jim Blandy committed
139
;;;     When it does not appear at top-level, it is similar to the
Karl Heuer's avatar
Karl Heuer committed
140
;;;     Common Lisp #. reader macro (but not in interpreted code).
Jim Blandy's avatar
Jim Blandy committed
141 142 143 144
;;;
;;;  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.
;;;
145
;;;  o  The command compile-defun is analogous to eval-defun.
Jim Blandy's avatar
Jim Blandy committed
146 147 148 149
;;;
;;;  o  If you run byte-compile-file on a filename which is visited in a 
;;;     buffer, and that buffer is modified, you are asked whether you want
;;;     to save the buffer before compiling.
150
;;;
151 152
;;;  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
153

154 155
(require 'backquote)

Jim Blandy's avatar
Jim Blandy committed
156 157
(or (fboundp 'defsubst)
    ;; This really ought to be loaded already!
158
    (load-library "byte-run"))
Jim Blandy's avatar
Jim Blandy committed
159

160 161 162 163
;;; The feature of compiling in a specific target Emacs version
;;; has been turned off because compile time options are a bad idea.
(defmacro byte-compile-single-version () nil)
(defmacro byte-compile-version-cond (cond) cond)
Jim Blandy's avatar
Jim Blandy committed
164 165 166 167 168 169 170

;;; The crud you see scattered through this file of the form
;;;   (or (and (boundp 'epoch::version) epoch::version)
;;;	  (string-lessp emacs-version "19"))
;;; is because the Epoch folks couldn't be bothered to follow the
;;; normal emacs version numbering convention.

171 172 173 174 175 176 177 178
;; (if (byte-compile-version-cond
;;      (or (and (boundp 'epoch::version) epoch::version)
;; 	 (string-lessp emacs-version "19")))
;;     (progn
;;       ;; emacs-18 compatibility.
;;       (defvar baud-rate (baud-rate))	;Define baud-rate if it's undefined
;; 
;;       (if (byte-compile-single-version)
179 180
;; 	  (defmacro byte-code-function-p (x) "Emacs 18 doesn't have these." nil)
;; 	(defun byte-code-function-p (x) "Emacs 18 doesn't have these." nil))
181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196
;; 
;;       (or (and (fboundp 'member)
;; 	       ;; avoid using someone else's possibly bogus definition of this.
;; 	       (subrp (symbol-function 'member)))
;; 	  (defun member (elt list)
;; 	    "like memq, but uses equal instead of eq.  In v19, this is a subr."
;; 	    (while (and list (not (equal elt (car list))))
;; 	      (setq list (cdr list)))
;; 	    list))))


(defvar emacs-lisp-file-regexp (if (eq system-type 'vax-vms)
				   "\\.EL\\(;[0-9]+\\)?$"
				 "\\.el$")
  "*Regexp which matches Emacs Lisp source files.
You may want to redefine `byte-compile-dest-file' if you change this.")
Jim Blandy's avatar
Jim Blandy committed
197

198 199 200 201 202 203 204 205 206 207
;; 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
208
(or (fboundp 'byte-compile-dest-file)
209
    ;; The user may want to redefine this along with emacs-lisp-file-regexp,
Jim Blandy's avatar
Jim Blandy committed
210 211
    ;; so only define it if it is undefined.
    (defun byte-compile-dest-file (filename)
212
      "Convert an Emacs Lisp source file name to a compiled file name."
213
      (setq filename (byte-compiler-base-file-name filename))
Jim Blandy's avatar
Jim Blandy committed
214 215
      (setq filename (file-name-sans-versions filename))
      (cond ((eq system-type 'vax-vms)
216 217 218 219
		 (concat (substring filename 0 (string-match ";" filename)) "c"))
		((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
220 221

;; This can be the 'byte-compile property of any symbol.
222
(autoload 'byte-compile-inline-expand "byte-opt")
Jim Blandy's avatar
Jim Blandy committed
223 224

;; This is the entrypoint to the lapcode optimizer pass1.
225
(autoload 'byte-optimize-form "byte-opt")
Jim Blandy's avatar
Jim Blandy committed
226
;; This is the entrypoint to the lapcode optimizer pass2.
227 228
(autoload 'byte-optimize-lapcode "byte-opt")
(autoload 'byte-compile-unfold-lambda "byte-opt")
Jim Blandy's avatar
Jim Blandy committed
229

230 231 232 233 234 235
;; 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")

Jim Blandy's avatar
Jim Blandy committed
236 237 238 239
(defvar byte-compile-verbose
  (and (not noninteractive) (> baud-rate search-slow-speed))
  "*Non-nil means print messages describing progress of byte-compiler.")

240 241 242 243 244 245 246 247 248
(defvar byte-compile-compatibility nil
  "*Non-nil means generate output that can run in Emacs 18.")

;; (defvar byte-compile-generate-emacs19-bytecodes
;;         (not (or (and (boundp 'epoch::version) epoch::version)
;; 		 (string-lessp emacs-version "19")))
;;   "*If this is true, then the byte-compiler will generate bytecode which 
;; makes use of byte-ops which are present only in Emacs 19.  Code generated
;; this way can never be run in Emacs 18, and may even cause it to crash.")
Jim Blandy's avatar
Jim Blandy committed
249 250

(defvar byte-optimize t
Richard M. Stallman's avatar
Richard M. Stallman committed
251 252 253 254 255
  "*Enables optimization in the byte compiler.
nil means don't do any optimization.
t means do all optimizations.
`source' means do source-level optimizations only.
`byte' means do code-level optimizations only.")
Jim Blandy's avatar
Jim Blandy committed
256 257

(defvar byte-compile-delete-errors t
Richard M. Stallman's avatar
Richard M. Stallman committed
258 259
  "*If non-nil, the optimizer may delete forms that may signal an error.
This includes variable references and calls to functions such as `car'.")
Jim Blandy's avatar
Jim Blandy committed
260

261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281
(defvar byte-compile-dynamic nil
  "*If non-nil, compile function bodies so they load lazily.
They are hidden comments in the compiled file, and brought into core when the
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.")

(defvar byte-compile-dynamic-docstrings t
  "*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.

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.

282 283 284 285 286
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.

287 288
This option is enabled by default because it reduces Emacs memory usage.")

Jim Blandy's avatar
Jim Blandy committed
289 290 291 292 293 294
(defvar byte-optimize-log nil
  "*If true, the byte-compiler will log its optimizations into *Compile-Log*.
If this is 'source, then only source-level optimizations will be logged.
If it is 'byte, then only byte-level optimizations will be logged.")

(defvar byte-compile-error-on-warn nil
Richard M. Stallman's avatar
Richard M. Stallman committed
295
  "*If true, the byte-compiler reports warnings with `error'.")
Jim Blandy's avatar
Jim Blandy committed
296

297 298
(defconst byte-compile-warning-types
  '(redefine callargs free-vars unresolved obsolete))
Jim Blandy's avatar
Jim Blandy committed
299
(defvar byte-compile-warnings t
Jim Blandy's avatar
Jim Blandy committed
300
  "*List of warnings that the byte-compiler should issue (t for all).
Jim Blandy's avatar
Jim Blandy committed
301 302 303 304 305 306 307
Elements of the list may be be:

  free-vars   references to variables not in the current lexical scope.
  unresolved  calls to unknown functions.
  callargs    lambda calls with args that don't match the definition.
  redefine    function cell redefined from a macro to a lambda or vice
              versa, or redefined to take a different number of arguments.
308
  obsolete      obsolete variables and functions.
Jim Blandy's avatar
Jim Blandy committed
309

Richard M. Stallman's avatar
Richard M. Stallman committed
310
See also the macro `byte-compiler-options'.")
Jim Blandy's avatar
Jim Blandy committed
311 312

(defvar byte-compile-generate-call-tree nil
313 314 315 316 317
  "*Non-nil means collect call-graph information when compiling.
This records functions were called and from where.
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
318 319 320 321 322 323

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
324
\(that is, to which no calls have been compiled).  Functions which can be
Jim Blandy's avatar
Jim Blandy committed
325 326 327 328 329 330 331 332 333 334 335 336
invoked interactively are excluded from this list.")

(defconst byte-compile-call-tree nil "Alist of functions and their call tree.
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.")

(defvar byte-compile-call-tree-sort 'name
337 338 339 340 341 342 343 344 345 346 347
  "*If non-nil, sort the call tree.
The values `name', `callers', `calls', `calls+callers'
specify different fields to sort on.")

;; (defvar byte-compile-overwrite-file t
;;   "If nil, old .elc files are deleted before the new is saved, and .elc
;; files will have the same modes as the corresponding .el file.  Otherwise,
;; existing .elc files will simply be overwritten, and the existing modes
;; will not be changed.  If this variable is nil, then an .elc file which 
;; is a symbolic link will be turned into a normal file, instead of the file
;; which the link points to being overwritten.")
Jim Blandy's avatar
Jim Blandy committed
348 349 350 351 352 353 354 355 356 357 358

(defvar byte-compile-constants nil
  "list of all constants encountered during compilation of this form")
(defvar byte-compile-variables nil
  "list of all variables encountered during compilation of this form")
(defvar byte-compile-bound-variables nil
  "list of variables bound in the context of the current form; this list
lives partly on the stack.")
(defvar byte-compile-free-references)
(defvar byte-compile-free-assignments)

Richard M. Stallman's avatar
Richard M. Stallman committed
359 360
(defvar byte-compiler-error-flag)

Jim Blandy's avatar
Jim Blandy committed
361
(defconst byte-compile-initial-macro-environment
362 363 364
  '(
;;     (byte-compiler-options . (lambda (&rest forms)
;; 			       (apply 'byte-compiler-options-handler forms)))
Jim Blandy's avatar
Jim Blandy committed
365 366 367 368 369 370 371 372 373 374 375
    (eval-when-compile . (lambda (&rest body)
			   (list 'quote (eval (byte-compile-top-level
					       (cons 'progn body))))))
    (eval-and-compile . (lambda (&rest body)
			  (eval (cons 'progn body))
			  (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
376 377
  "Alist of macros defined in the file being compiled.
Each element looks like (MACRONAME . DEFINITION).  It is
378
\(MACRONAME . nil) when a macro is redefined as a function.")
Jim Blandy's avatar
Jim Blandy committed
379 380

(defvar byte-compile-function-environment nil
381 382 383 384
  "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
\(FUNCTIONNAME . nil) when a function is redefined as a macro.")
Jim Blandy's avatar
Jim Blandy committed
385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445

(defvar byte-compile-unresolved-functions nil
  "Alist of undefined functions to which calls have been compiled (used for
warnings when the function is later defined with incorrect args).")

(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

(defconst byte-code-vector nil
  "An array containing byte-code names indexed by byte-code values.")

(defconst byte-stack+-info nil
  "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))
    ;; emacs-18 has no REMPROP.
    (put 'byte-code-vector 'tmp-compile-time-value nil)
    (put 'byte-stack+-info 'tmp-compile-time-value nil)))


;; unused: 0-7

;; These opcodes are special in that they pack their argument into the
;; opcode word.
;;
(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")
446
;; codes 8-47 are consumed by the preceding opcodes
Jim Blandy's avatar
Jim Blandy committed
447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554

;; 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  97  1 byte-mark-OBSOLETE) ; no longer generated as of v18
(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)
(byte-defop 114  1 byte-read-char-OBSOLETE)
(byte-defop 115  0 byte-set-mark-OBSOLETE)
(byte-defop 116  1 byte-interactive-p)

;; 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
  "to examine top-of-stack, jump and don't pop it if it's nil, 
otherwise pop it")
(byte-defop 134 -1 byte-goto-if-not-nil-else-pop
  "to examine top-of-stack, jump and don't pop it if it's non nil, 
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")
(byte-defop 139  0 byte-save-window-excursion
  "to make a binding to record entire window configuration")
(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")

555 556 557
;; For condition-case.  Takes, on stack, the variable to bind, 
;; an expression for the body, and a list of clauses.
(byte-defop 143 -2 byte-condition-case)
Jim Blandy's avatar
Jim Blandy committed
558

559 560 561 562 563
;; For entry to with-output-to-temp-buffer.
;; Takes, on stack, the buffer name.
;; Binds standard-output and does some other things.
;; Returns with temp buffer on the stack in place of buffer name.
(byte-defop 144  0 byte-temp-output-buffer-setup)
Jim Blandy's avatar
Jim Blandy committed
564

565 566 567 568 569
;; For exit from with-output-to-temp-buffer.
;; Expects the temp buffer on the stack underneath value to return.
;; Pops them both, then pushes the value back on.
;; Unbinds standard-output and makes the temp buffer visible.
(byte-defop 145 -1 byte-temp-output-buffer-show)
Jim Blandy's avatar
Jim Blandy committed
570 571

;; these ops are new to v19
572 573

;; To unbind back to the beginning of this frame.
574
;; Not used yet, but will be needed for tail-recursion elimination.
575
(byte-defop 146  0 byte-unbind-all)
Jim Blandy's avatar
Jim Blandy committed
576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600

;; 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
601
;; unused: 169-174
Jim Blandy's avatar
Jim Blandy committed
602 603 604 605 606 607 608 609 610 611 612 613 614 615
(byte-defop 175 nil byte-listN)
(byte-defop 176 nil byte-concatN)
(byte-defop 177 nil byte-insertN)

;; unused: 178-191

(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)
616
  "List of byte-codes whose offset is a pc.")
Jim Blandy's avatar
Jim Blandy committed
617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664

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

(byte-extrude-byte-code-vectors)

;;; lapcode generator
;;;
;;; 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.

(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
	(bytes '())		; Put the output bytes here
	(patchlist nil)		; List of tags and goto's to patch
	rest rel tmp)
    (while lap
      (setq op (car (car lap))
	    off (cdr (car lap)))
      (cond ((not (symbolp op))
665
	     (error "Non-symbolic opcode `%s'" op))
Jim Blandy's avatar
Jim Blandy committed
666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705
	    ((eq op 'TAG)
	     (setcar off pc)
	     (setq patchlist (cons off patchlist)))
	    ((memq op byte-goto-ops)
	     (setq pc (+ pc 3))
	     (setq bytes (cons (cons pc (cdr off))
			       (cons nil
				     (cons (symbol-value op) bytes))))
	     (setq patchlist (cons bytes patchlist)))
	    (t
	     (setq bytes
		   (cond ((cond ((consp off)
				 ;; Variable or constant reference
				 (setq off (cdr off))
				 (eq op 'byte-constant)))
			  (cond ((< off byte-constant-limit)
				 (setq pc (1+ pc))
				 (cons (+ byte-constant off) bytes))
				(t
				 (setq pc (+ 3 pc))
				 (cons (lsh off -8)
				       (cons (logand off 255)
					     (cons byte-constant2 bytes))))))
			 ((<= byte-listN (symbol-value op))
			  (setq pc (+ 2 pc))
			  (cons off (cons (symbol-value op) bytes)))
			 ((< off 6)
			  (setq pc (1+ pc))
			  (cons (+ (symbol-value op) off) bytes))
			 ((< off 256)
			  (setq pc (+ 2 pc))
			  (cons off (cons (+ (symbol-value op) 6) bytes)))
			 (t
			  (setq pc (+ 3 pc))
			  (cons (lsh off -8)
				(cons (logand off 255)
				      (cons (+ (symbol-value op) 7)
					    bytes))))))))
      (setq lap (cdr lap)))
    ;;(if (not (= pc (length bytes)))
706
    ;;    (error "Compiler error: pc mismatch - %s %s" pc (length bytes)))
Jim Blandy's avatar
Jim Blandy committed
707 708 709 710 711 712 713 714 715 716 717 718 719 720 721
    ;; Patch PC into jumps
    (let (bytes)
      (while patchlist
	(setq bytes (car patchlist))
	(cond ((atom (car bytes)))	; Tag
	      (t			; Absolute jump
	       (setq pc (car (cdr (car bytes))))	; Pick PC from tag
	       (setcar (cdr bytes) (logand pc 255))
	       (setcar bytes (lsh pc -8))))
	(setq patchlist (cdr patchlist))))
    (concat (nreverse bytes))))


;;; byte compiler messages

722 723 724
(defvar byte-compile-current-form nil)
(defvar byte-compile-current-file nil)
(defvar byte-compile-dest-file nil)
Jim Blandy's avatar
Jim Blandy committed
725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742

(defmacro byte-compile-log (format-string &rest args)
  (list 'and
	'byte-optimize
	'(memq byte-optimize-log '(t source))
	(list 'let '((print-escape-newlines t)
		     (print-level 4)
		     (print-length 4))
	      (list 'byte-compile-log-1
		    (cons 'format
		      (cons format-string
			(mapcar
			 '(lambda (x)
			    (if (symbolp x) (list 'prin1-to-string x) x))
			 args)))))))

(defconst byte-compile-last-warned-form nil)

743 744
;; Log a message STRING in *Compile-Log*.
;; Also log the current function and file if not already done.
Jim Blandy's avatar
Jim Blandy committed
745
(defun byte-compile-log-1 (string &optional fill)
Jim Blandy's avatar
Jim Blandy committed
746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779
  (cond (noninteractive
	 (if (or byte-compile-current-file
		 (and byte-compile-last-warned-form
		      (not (eq byte-compile-current-form
			       byte-compile-last-warned-form))))
	     (message (format "While compiling %s%s:"
			(or byte-compile-current-form "toplevel forms")
			(if byte-compile-current-file
			    (if (stringp byte-compile-current-file)
				(concat " in file " byte-compile-current-file)
			      (concat " in buffer "
				      (buffer-name byte-compile-current-file)))
			    ""))))
	 (message "  %s" string))
	(t
	 (save-excursion
	   (set-buffer (get-buffer-create "*Compile-Log*"))
	   (goto-char (point-max))
	   (cond ((or byte-compile-current-file
		      (and byte-compile-last-warned-form
			   (not (eq byte-compile-current-form
				    byte-compile-last-warned-form))))
		  (if byte-compile-current-file
		      (insert "\n\^L\n" (current-time-string) "\n"))
		  (insert "While compiling "
			  (if byte-compile-current-form
			      (format "%s" byte-compile-current-form)
			    "toplevel forms"))
		  (if byte-compile-current-file
		      (if (stringp byte-compile-current-file)
			  (insert " in file " byte-compile-current-file)
			(insert " in buffer "
				(buffer-name byte-compile-current-file))))
		  (insert ":\n")))
Jim Blandy's avatar
Jim Blandy committed
780 781 782 783 784 785
	   (insert "  " string "\n")
	   (if (and fill (not (string-match "\n" string)))
	       (let ((fill-prefix "     ")
		     (fill-column 78))
		 (fill-paragraph nil)))
	   )))
Jim Blandy's avatar
Jim Blandy committed
786 787 788
  (setq byte-compile-current-file nil
	byte-compile-last-warned-form byte-compile-current-form))

789 790 791 792 793 794
;; Log the start of a file in *Compile-Log*, and mark it as done.
;; But do nothing in batch mode.
(defun byte-compile-log-file ()
  (and byte-compile-current-file (not noninteractive)
       (save-excursion
	 (set-buffer (get-buffer-create "*Compile-Log*"))
795
	 (goto-char (point-max))
796 797 798 799 800 801 802
	 (insert "\n\^L\nCompiling "
		 (if (stringp byte-compile-current-file)
		     (concat "file " byte-compile-current-file)
		   (concat "buffer " (buffer-name byte-compile-current-file)))
		 " at " (current-time-string) "\n")
	 (setq byte-compile-current-file nil))))

Jim Blandy's avatar
Jim Blandy committed
803 804 805 806
(defun byte-compile-warn (format &rest args)
  (setq format (apply 'format format args))
  (if byte-compile-error-on-warn
      (error "%s" format)		; byte-compile-file catches and logs it
Jim Blandy's avatar
Jim Blandy committed
807
    (byte-compile-log-1 (concat "** " format) t)
808 809 810 811 812
;;; It is useless to flash warnings too fast to be read.
;;; Besides, they will all be shown at the end.
;;;    (or noninteractive  ; already written on stdout.
;;;	(message "Warning: %s" format))
    ))
Jim Blandy's avatar
Jim Blandy committed
813

Jim Blandy's avatar
Jim Blandy committed
814 815 816
;;; This function should be used to report errors that have halted
;;; compilation of the current file.
(defun byte-compile-report-error (error-info)
Richard M. Stallman's avatar
Richard M. Stallman committed
817
  (setq byte-compiler-error-flag t)
Jim Blandy's avatar
Jim Blandy committed
818 819 820 821 822
  (byte-compile-log-1
   (concat "!! "
	   (format (if (cdr error-info) "%s (%s)" "%s")
		   (get (car error-info) 'error-message)
		   (prin1-to-string (cdr error-info))))))
Jim Blandy's avatar
Jim Blandy committed
823

Jim Blandy's avatar
Jim Blandy committed
824 825
;;; Used by make-obsolete.
(defun byte-compile-obsolete (form)
826 827
  (let ((new (get (car form) 'byte-obsolete-info)))
    (if (memq 'obsolete byte-compile-warnings)
828 829 830
	(byte-compile-warn "%s is an obsolete function; %s" (car form)
			   (if (stringp (car new))
			       (car new)
831 832
			       (format "use %s instead." (car new)))))
    (funcall (or (cdr new) 'byte-compile-normal-call) form)))
Jim Blandy's avatar
Jim Blandy committed
833 834 835

;; Compiler options

836 837 838 839 840 841 842 843 844
;; (defvar byte-compiler-valid-options
;;   '((optimize byte-optimize (t nil source byte) val)
;;     (file-format byte-compile-compatibility (emacs18 emacs19)
;; 		 (eq val 'emacs18))
;; ;;     (new-bytecodes byte-compile-generate-emacs19-bytecodes (t nil) val)
;;     (delete-errors byte-compile-delete-errors (t nil) val)
;;     (verbose byte-compile-verbose (t nil) val)
;;     (warnings byte-compile-warnings ((callargs redefine free-vars unresolved))
;; 	      val)))
Jim Blandy's avatar
Jim Blandy committed
845 846 847 848

;; Inhibit v18/v19 selectors if the version is hardcoded.
;; #### This should print a warning if the user tries to change something 
;; than can't be changed because the running compiler doesn't support it.
849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890
;; (cond
;;  ((byte-compile-single-version)
;;   (setcar (cdr (cdr (assq 'new-bytecodes byte-compiler-valid-options)))
;; 	  (list (byte-compile-version-cond
;; 		 byte-compile-generate-emacs19-bytecodes)))
;;   (setcar (cdr (cdr (assq 'file-format byte-compiler-valid-options)))
;; 	  (if (byte-compile-version-cond byte-compile-compatibility)
;; 	      '(emacs18) '(emacs19)))))

;; (defun byte-compiler-options-handler (&rest args)
;;   (let (key val desc choices)
;;     (while args
;;       (if (or (atom (car args)) (nthcdr 2 (car args)) (null (cdr (car args))))
;; 	  (error "Malformed byte-compiler option `%s'" (car args)))
;;       (setq key (car (car args))
;; 	    val (car (cdr (car args)))
;; 	    desc (assq key byte-compiler-valid-options))
;;       (or desc
;; 	  (error "Unknown byte-compiler option `%s'" key))
;;       (setq choices (nth 2 desc))
;;       (if (consp (car choices))
;; 	  (let (this
;; 		(handler 'cons)
;; 		(ret (and (memq (car val) '(+ -))
;; 			  (copy-sequence (if (eq t (symbol-value (nth 1 desc)))
;; 					     choices
;; 					   (symbol-value (nth 1 desc)))))))
;; 	    (setq choices (car  choices))
;; 	    (while val
;; 	      (setq this (car val))
;; 	      (cond ((memq this choices)
;; 		     (setq ret (funcall handler this ret)))
;; 		    ((eq this '+) (setq handler 'cons))
;; 		    ((eq this '-) (setq handler 'delq))
;; 		    ((error "`%s' only accepts %s" key choices)))
;; 	      (setq val (cdr val)))
;; 	    (set (nth 1 desc) ret))
;; 	(or (memq val choices)
;; 	    (error "`%s' must be one of `%s'" key choices))
;; 	(set (nth 1 desc) (eval (nth 3 desc))))
;;       (setq args (cdr args)))
;;     nil))
Jim Blandy's avatar
Jim Blandy committed
891 892 893 894 895 896

;;; sanity-checking arglists

(defun byte-compile-fdefinition (name macro-p)
  (let* ((list (if macro-p
		   byte-compile-macro-environment
897
		 byte-compile-function-environment))
Jim Blandy's avatar
Jim Blandy committed
898 899 900 901 902 903 904 905
	 (env (cdr (assq name list))))
    (or env
	(let ((fn name))
	  (while (and (symbolp fn)
		      (fboundp fn)
		      (or (symbolp (symbol-function fn))
			  (consp (symbol-function fn))
			  (and (not macro-p)
906
			       (byte-code-function-p (symbol-function fn)))))
Jim Blandy's avatar
Jim Blandy committed
907
	    (setq fn (symbol-function fn)))
908
	  (if (and (not macro-p) (byte-code-function-p fn))
Jim Blandy's avatar
Jim Blandy committed
909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954
	      fn
	    (and (consp fn)
		 (if (eq 'macro (car fn))
		     (cdr fn)
		   (if macro-p
		       nil
		     (if (eq 'autoload (car fn))
			 nil
		       fn)))))))))

(defun byte-compile-arglist-signature (arglist)
  (let ((args 0)
	opts
	restp)
    (while arglist
      (cond ((eq (car arglist) '&optional)
	     (or opts (setq opts 0)))
	    ((eq (car arglist) '&rest)
	     (if (cdr arglist)
		 (setq restp t
		       arglist nil)))
	    (t
	     (if opts
		 (setq opts (1+ opts))
		 (setq args (1+ args)))))
      (setq arglist (cdr arglist)))
    (cons args (if restp nil (if opts (+ args opts) args)))))


(defun byte-compile-arglist-signatures-congruent-p (old new)
  (not (or
	 (> (car new) (car old))  ; requires more args now
	 (and (null (cdr old))    ; tooks rest-args, doesn't any more
	      (cdr new))
	 (and (cdr new) (cdr old) ; can't take as many args now
	      (< (cdr new) (cdr old)))
	 )))

(defun byte-compile-arglist-signature-string (signature)
  (cond ((null (cdr signature))
	 (format "%d+" (car signature)))
	((= (car signature) (cdr signature))
	 (format "%d" (car signature)))
	(t (format "%d-%d" (car signature) (cdr signature)))))


955
;; Warn if the form is calling a function with the wrong number of arguments.
Jim Blandy's avatar
Jim Blandy committed
956 957 958 959 960 961
(defun byte-compile-callargs-warn (form)
  (let* ((def (or (byte-compile-fdefinition (car form) nil)
		  (byte-compile-fdefinition (car form) t)))
	 (sig (and def (byte-compile-arglist-signature
			 (if (eq 'lambda (car-safe def))
			     (nth 1 def)
962
			   (if (byte-code-function-p def)
963 964
			       (aref def 0)
			     '(&rest def))))))
Jim Blandy's avatar
Jim Blandy committed
965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988
	 (ncall (length (cdr form))))
    (if sig
	(if (or (< ncall (car sig))
		(and (cdr sig) (> ncall (cdr sig))))
	    (byte-compile-warn
	      "%s called with %d argument%s, but %s %s"
	      (car form) ncall
	      (if (= 1 ncall) "" "s")
	      (if (< ncall (car sig))
		  "requires"
		  "accepts only")
	      (byte-compile-arglist-signature-string sig)))
      (or (fboundp (car form)) ; might be a subr or autoload.
	  (eq (car form) byte-compile-current-form) ; ## this doesn't work with recursion.
	  ;; It's a currently-undefined function.  Remember number of args in call.
	  (let ((cons (assq (car form) byte-compile-unresolved-functions))
		(n (length (cdr form))))
	    (if cons
		(or (memq n (cdr cons))
		    (setcdr cons (cons n (cdr cons))))
		(setq byte-compile-unresolved-functions
		      (cons (list (car form) n)
			    byte-compile-unresolved-functions))))))))

989 990
;; Warn if the function or macro is being redefined with a different
;; number of arguments.
Jim Blandy's avatar
Jim Blandy committed
991 992 993 994 995 996
(defun byte-compile-arglist-warn (form macrop)
  (let ((old (byte-compile-fdefinition (nth 1 form) macrop)))
    (if old
	(let ((sig1 (byte-compile-arglist-signature
		      (if (eq 'lambda (car-safe old))
			  (nth 1 old)
997
			(if (byte-code-function-p old)
998 999
			    (aref old 0)
			  '(&rest def)))))
Jim Blandy's avatar
Jim Blandy committed
1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029
	      (sig2 (byte-compile-arglist-signature (nth 2 form))))
	  (or (byte-compile-arglist-signatures-congruent-p sig1 sig2)
	      (byte-compile-warn "%s %s used to take %s %s, now takes %s"
		(if (eq (car form) 'defun) "function" "macro")
		(nth 1 form)
		(byte-compile-arglist-signature-string sig1)
		(if (equal sig1 '(1 . 1)) "argument" "arguments")
		(byte-compile-arglist-signature-string sig2))))
      ;; This is the first definition.  See if previous calls are compatible.
      (let ((calls (assq (nth 1 form) byte-compile-unresolved-functions))
	    nums sig min max)
	(if calls
	    (progn
	      (setq sig (byte-compile-arglist-signature (nth 2 form))
		    nums (sort (copy-sequence (cdr calls)) (function <))
		    min (car nums)
		    max (car (nreverse nums)))
	      (if (or (< min (car sig))
		      (and (cdr sig) (> max (cdr sig))))
		  (byte-compile-warn
	    "%s being defined to take %s%s, but was previously called with %s"
	            (nth 1 form)
		    (byte-compile-arglist-signature-string sig)
		    (if (equal sig '(1 . 1)) " arg" " args")
		    (byte-compile-arglist-signature-string (cons min max))))
	      
	      (setq byte-compile-unresolved-functions
		    (delq calls byte-compile-unresolved-functions)))))
      )))

1030 1031 1032
;; If we have compiled any calls to functions which are not known to be 
;; defined, issue a warning enumerating them.
;; `unresolved' in the list `byte-compile-warnings' disables this.
Jim Blandy's avatar
Jim Blandy committed
1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081
(defun byte-compile-warn-about-unresolved-functions ()
  (if (memq 'unresolved byte-compile-warnings)
   (let ((byte-compile-current-form "the end of the data"))
    (if (cdr byte-compile-unresolved-functions)
	(let* ((str "The following functions are not known to be defined: ")
	       (L (length str))
	       (rest (reverse byte-compile-unresolved-functions))
	       s)
	  (while rest
	    (setq s (symbol-name (car (car rest)))
		  L (+ L (length s) 2)
		  rest (cdr rest))
	    (if (< L (1- fill-column))
		(setq str (concat str " " s (and rest ",")))
	      (setq str (concat str "\n    " s (and rest ","))
		    L (+ (length s) 4))))
	  (byte-compile-warn "%s" str))
	(if byte-compile-unresolved-functions
	    (byte-compile-warn "the function %s is not known to be defined."
	      (car (car byte-compile-unresolved-functions)))))))
  nil)


(defmacro byte-compile-constp (form)
  ;; Returns non-nil if FORM is a constant.
  (` (cond ((consp (, form)) (eq (car (, form)) 'quote))
	   ((not (symbolp (, form))))
	   ((memq (, form) '(nil t))))))

(defmacro byte-compile-close-variables (&rest body)
  (cons 'let
	(cons '(;;
		;; Close over these variables to encapsulate the
		;; compilation state
		;;
		(byte-compile-macro-environment
		 ;; Copy it because the compiler may patch into the
		 ;; macroenvironment.
		 (copy-alist byte-compile-initial-macro-environment))
		(byte-compile-function-environment nil)
		(byte-compile-bound-variables nil)
		(byte-compile-free-references nil)
		(byte-compile-free-assignments nil)
		;;
		;; Close over these variables so that `byte-compiler-options'
		;; can change them on a per-file basis.
		;;
		(byte-compile-verbose byte-compile-verbose)
		(byte-optimize byte-optimize)
1082 1083 1084 1085
		(byte-compile-compatibility byte-compile-compatibility)
		(byte-compile-dynamic byte-compile-dynamic)
		(byte-compile-dynamic-docstrings
		 byte-compile-dynamic-docstrings)
1086 1087
;; 		(byte-compile-generate-emacs19-bytecodes
;; 		 byte-compile-generate-emacs19-bytecodes)
Jim Blandy's avatar
Jim Blandy committed
1088 1089 1090 1091 1092 1093
		(byte-compile-warnings (if (eq byte-compile-warnings t)
					   byte-compile-warning-types
					 byte-compile-warnings))
		)
	      body)))

1094
(defvar byte-compile-warnings-point-max nil)
Jim Blandy's avatar
Jim Blandy committed
1095 1096
(defmacro displaying-byte-compile-warnings (&rest body)
  (list 'let
1097 1098 1099 1100 1101 1102 1103 1104 1105 1106
	'((byte-compile-warnings-point-max byte-compile-warnings-point-max))
     ;; Log the file name.
     '(byte-compile-log-file)
     ;; Record how much is logged now.
     ;; We will display the log buffer if anything more is logged
     ;; before the end of BODY.
     '(or byte-compile-warnings-point-max
	  (save-excursion
	    (set-buffer (get-buffer-create "*Compile-Log*"))
	    (setq byte-compile-warnings-point-max (point-max))))
Jim Blandy's avatar
Jim Blandy committed
1107 1108 1109 1110 1111
     (list 'unwind-protect
	   (list 'condition-case 'error-info
		 (cons 'progn body)
	       '(error
		 (byte-compile-report-error error-info)))
Jim Blandy's avatar
Jim Blandy committed
1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123
       '(save-excursion
	  ;; If there were compilation warnings, display them.
	  (set-buffer "*Compile-Log*")
	  (if (= byte-compile-warnings-point-max (point-max))
	      nil
	    (select-window
	     (prog1 (selected-window)
	       (select-window (display-buffer (current-buffer)))
	       (goto-char byte-compile-warnings-point-max)
	       (recenter 1))))))))


1124
;;;###autoload
1125 1126 1127
(defun byte-force-recompile (directory)
  "Recompile every `.el' file in DIRECTORY that already has a `.elc' file.
Files in subdirectories of DIRECTORY are processed also."
1128
  (interactive "DByte recompile directory: ")
1129 1130 1131 1132
  (byte-recompile-directory directory nil t))

;;;###autoload
(defun byte-recompile-directory (directory &optional arg force)
Jim Blandy's avatar
Jim Blandy committed
1133 1134
  "Recompile every `.el' file in DIRECTORY that needs recompilation.
This is if a `.elc' file exists but is older than the `.el' file.
1135
Files in subdirectories of DIRECTORY are processed also.
Jim Blandy's avatar
Jim Blandy committed
1136 1137 1138

If the `.elc' file does not exist, normally the `.el' file is *not* compiled.
But a prefix argument (optional second arg) means ask user,
Jim Blandy's avatar
Jim Blandy committed
1139
for each such `.el' file, whether to compile it.  Prefix argument 0 means
1140 1141
don't ask and compile the file anyway.

1142 1143 1144 1145
A nonzero prefix argument also means ask about each subdirectory.

If the third argument FORCE is non-nil,
recompile every `.el' file that already has a `.elc' file."
Jim Blandy's avatar
Jim Blandy committed
1146
  (interactive "DByte recompile directory: \nP")
1147 1148
  (if arg
      (setq arg (prefix-numeric-value arg)))
1149 1150 1151
  (if noninteractive
      nil
    (save-some-buffers)
1152
    (force-mode-line-update))
Jim Blandy's avatar
Jim Blandy committed
1153 1154 1155 1156 1157 1158 1159
  (let ((directories (list (expand-file-name directory)))
	(file-count 0)
	(dir-count 0)
	last-dir)
    (displaying-byte-compile-warnings
     (while directories
       (setq directory (car directories))
1160
       (or noninteractive (message "Checking %s..." directory))
Jim Blandy's avatar
Jim Blandy committed
1161 1162 1163 1164 1165
       (let ((files (directory-files directory))
	     source dest)
	 (while files
	   (setq source (expand-file-name (car files) directory))
	   (if (and (not (member (car files) '("." ".." "RCS" "CVS")))
1166 1167
		    (file-directory-p source)
		    (not (file-symlink-p source)))
1168
	       ;; This file is a subdirectory.  Handle them differently.
Jim Blandy's avatar
Jim Blandy committed
1169
	       (if (or (null arg)
1170
		       (eq 0 arg)
Jim Blandy's avatar
Jim Blandy committed
1171 1172 1173
		       (y-or-n-p (concat "Check " source "? ")))
		   (setq directories
			 (nconc directories (list source))))
1174
	     ;; It is an ordinary file.  Decide whether to compile it.
Jim Blandy's avatar
Jim Blandy committed
1175 1176 1177 1178
	     (if (and (string-match emacs-lisp-file-regexp source)
		      (not (auto-save-file-name-p source))
		      (setq dest (byte-compile-dest-file source))
		      (if (file-exists-p dest)
1179 1180 1181
			  ;; File was already compiled.
			  (or force (file-newer-than-file-p source dest))
			;; No compiled file exists yet.
Jim Blandy's avatar
Jim Blandy committed
1182
			(and arg
1183
			     (or (eq 0 arg)
Jim Blandy's avatar
Jim Blandy committed
1184
				 (y-or-n-p (concat "Compile " source "? "))))))
1185 1186 1187
		 (progn (if (and noninteractive (not byte-compile-verbose))
			    (message "Compiling %s..." source))
			(byte-compile-file source)
1188 1189
			(or noninteractive
			    (message "Checking %s..." directory))
Jim Blandy's avatar
Jim Blandy committed
1190 1191 1192 1193 1194 1195 1196 1197 1198 1199
			(setq file-count (1+ file-count))
			(if (not (eq last-dir directory))
			    (setq last-dir directory
				  dir-count (1+ dir-count)))
			)))
	   (setq files (cdr files))))
       (setq directories (cdr directories))))
    (message "Done (Total of %d file%s compiled%s)"
	     file-count (if (= file-count 1) "" "s")
	     (if (> dir-count 1) (format " in %d directories" dir-count) ""))))
Jim Blandy's avatar
Jim Blandy committed
1200

1201
;;;###autoload
Jim Blandy's avatar
Jim Blandy committed
1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215
(defun byte-compile-file (filename &optional load)
  "Compile a file of Lisp code named FILENAME into a file of byte code.
The output file's name is made by appending `c' to the end of FILENAME.
With prefix arg (noninteractively: 2nd arg), load the file after compiling."
;;  (interactive "fByte compile file: \nP")
  (interactive
   (let ((file buffer-file-name)
	 (file-name nil)
	 (file-dir nil))
     (and file
	  (eq (cdr (assq 'major-mode (buffer-local-variables)))
	      'emacs-lisp-mode)
	  (setq file-name (file-name-nondirectory file)
		file-dir (file-name-directory file)))
1216 1217 1218
     (list (read-file-name (if current-prefix-arg
			       "Byte compile and load file: "
			     "Byte compile file: ")
1219
			   file-dir file-name nil)
1220
	   current-prefix-arg)))
Jim Blandy's avatar
Jim Blandy committed
1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233
  ;; Expand now so we get the current buffer's defaults
  (setq filename (expand-file-name filename))

  ;; If we're compiling a file that's in a buffer and is modified, offer
  ;; to save it first.
  (or noninteractive
      (let ((b (get-file-buffer (expand-file-name filename))))
	(if (and b (buffer-modified-p b)
		 (y-or-n-p (format "save buffer %s first? " (buffer-name b))))
	    (save-excursion (set-buffer b) (save-buffer)))))

  (if byte-compile-verbose
      (message "Compiling %s..." filename))
1234
  (let ((byte-compile-current-file filename)
1235 1236 1237 1238
	target-file input-buffer output-buffer
	byte-compile-dest-file)
    (setq target-file (byte-compile-dest-file filename))
    (setq byte-compile-dest-file target-file)
Jim Blandy's avatar
Jim Blandy committed
1239
    (save-excursion
Richard M. Stallman's avatar
Richard M. Stallman committed
1240 1241
      (setq input-buffer (get-buffer-create " *Compiler Input*"))
      (set-buffer input-buffer)
Jim Blandy's avatar
Jim Blandy committed
1242 1243 1244 1245
      (erase-buffer)
      (insert-file-contents filename)
      ;; Run hooks including the uncompression hook.
      ;; If they change the file name, then change it for the output also.
1246
      (let ((buffer-file-name filename)
1247
	    (default-major-mode 'emacs-lisp-mode)
1248 1249
	    (enable-local-eval nil))
        (normal-mode)
Richard M. Stallman's avatar
Richard M. Stallman committed
1250 1251 1252 1253 1254
        (setq filename buffer-file-name)))
    (setq byte-compiler-error-flag nil)
    ;; It is important that input-buffer not be current at this call,
    ;; so that the value of point set in input-buffer
    ;; within byte-compile-from-buffer lingers in that buffer.
1255
    (setq output-buffer (byte-compile-from-buffer input-buffer filename))
1256 1257
    (if byte-compiler-error-flag
	nil
1258 1259
      (if byte-compile-verbose
	  (message "Compiling %s...done" filename))
1260 1261 1262 1263 1264 1265 1266 1267
      (kill-buffer input-buffer)
      (save-excursion
	(set-buffer output-buffer)
	(goto-char (point-max))
	(insert "\n")			; aaah, unix.
	(let ((vms-stmlf-recfm t))
	  (if (file-writable-p target-file)
	      (let ((kanji-flag nil))	; for nemacs, from Nakagawa Takayuki
1268
		(if (or (eq system-type 'ms-dos) (eq system-type 'windows-nt))
1269
		    (setq buffer-file-type t))
1270 1271 1272 1273 1274 1275 1276 1277
		(write-region 1 (point-max) target-file))
	    ;; This is just to give a better error message than
	    ;; write-region
	    (signal 'file-error
		    (list "Opening output file"
			  (if (file-exists-p target-file)
			      "cannot overwrite file"
			    "directory not writable or nonexistent")
1278
			  target-file))))
1279 1280 1281 1282 1283 1284 1285
	(kill-buffer (current-buffer)))
      (if (and byte-compile-generate-call-tree
	       (or (eq t byte-compile-generate-call-tree)
		   (y-or-n-p (format "Report call tree for %s? " filename))))
	  (save-excursion
	    (display-call-tree filename)))
      (if load
1286 1287
	  (load target-file))
      t)))
Jim Blandy's avatar
Jim Blandy committed
1288

1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306
;;(defun byte-compile-and-load-file (&optional filename)
;;  "Compile a file of Lisp code named FILENAME into a file of byte code,
;;and then load it.  The output file's name is made by appending \"c\" to 
;;the end of FILENAME."
;;  (interactive)
;;  (if filename ; I don't get it, (interactive-p) doesn't always work
;;      (byte-compile-file filename t)
;;    (let ((current-prefix-arg '(4)))
;;      (call-interactively 'byte-compile-file))))

;;(defun byte-compile-buffer (&optional buffer)
;;  "Byte-compile and evaluate contents of BUFFER (default: the current buffer)."
;;  (interactive "bByte compile buffer: ")
;;  (setq buffer (if buffer (get-buffer buffer) (current-buffer)))
;;  (message "Compiling %s..." (buffer-name buffer))
;;  (let* ((filename (or (buffer-file-name buffer)
;;		       (concat "#<buffer " (buffer-name buffer) ">")))
;;	 (byte-compile-current-file buffer))
1307
;;    (byte-compile-from-buffer buffer nil))
1308 1309
;;  (message "Compiling %s...done" (buffer-name buffer))
;;  t)
Jim Blandy's avatar
Jim Blandy committed
1310 1311

;;; compiling a single function
1312
;;;###autoload
1313
(defun compile-defun (&optional arg)
Jim Blandy's avatar
Jim Blandy committed
1314 1315 1316 1317 1318 1319 1320 1321 1322
  "Compile and evaluate the current top-level form.
Print the result in the minibuffer.
With argument, insert value in current buffer after the form."
  (interactive "P")
  (save-excursion
    (end-of-defun)
    (beginning-of-defun)
    (let* ((byte-compile-current-file nil)
	   (byte-compile-last-warned-form 'nothing)
1323 1324
	   (value (eval (displaying-byte-compile-warnings
			 (byte-compile-sexp (read (current-buffer)))))))
Jim Blandy's avatar
Jim Blandy committed
1325 1326 1327 1328 1329 1330 1331
      (cond (arg
	     (message "Compiling from buffer... done.")
	     (prin1 value (current-buffer))
	     (insert "\n"))
	    ((message "%s" (prin1-to-string value)))))))


1332 1333
(defun byte-compile-from-buffer (inbuffer &optional filename)
  ;; Filename is used for the loading-into-Emacs-18 error message.
1334 1335 1336 1337 1338
  (let (outbuffer
	;; Prevent truncation of flonums and lists as we read and print them
	(float-output-format nil)
	(case-fold-search nil)
	(print-length nil)
1339
	(print-level nil)
1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358
	;; Simulate entry to byte-compile-top-level
	(byte-compile-constants nil)
	(byte-compile-variables nil)
	(byte-compile-tag-number 0)
	(byte-compile-depth 0)
	(byte-compile-maxdepth 0)
	(byte-compile-output nil)
	;;	  #### This is bound in b-c-close-variables.
	;;	  (byte-compile-warnings (if (eq byte-compile-warnings t)
	;;				     byte-compile-warning-types
	;;				   byte-compile-warnings))
	)
    (byte-compile-close-variables
     (save-excursion
       (setq outbuffer
	     (set-buffer (get-buffer-create " *Compiler Output*")))
       (erase-buffer)
       ;;	 (emacs-lisp-mode)
       (setq case-fold-search nil)