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;;; -*- Mode: Emacs-Lisp -*-
;;; Compilation of Lisp code into byte code.
;;; Copyright (C) 1985, 1986, 1987 Free Software Foundation, Inc.

;; By Jamie Zawinski <jwz@lucid.com> and Hallvard Furuseth <hbf@ulrik.uio.no>.

(defconst byte-compile-version "2.04; 5-feb-92.")

;; 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
;; the Free Software Foundation; either version 1, or (at your option)
;; 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.

;;; ========================================================================
;;; Entry points:
;;;	byte-recompile-directory, byte-compile-file, 
;;;	byte-compile-and-load-file byte-compile-buffer, batch-byte-compile,
;;;	byte-compile, byte-compile-sexp, elisp-compile-defun,
;;;	byte-compile-report-call-tree

;;; This version of the elisp 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;
;;;    - 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)
;;;				This defaults to nil in -batch mode, which is
;;;				slightly faster.
;;; byte-compile-emacs18-compatibility		Whether the compiler should
;;;				generate .elc files which can be loaded into
;;;				generic emacs 18's which don't have the file
;;;				bytecomp-runtime.el loaded as well;
;;; byte-compile-generate-emacs19-bytecodes	Whether to generate bytecodes
;;;				which exist only in emacs19.  This is a more
;;;				extreme step than setting emacs18-compatibility
;;;				to nil, because there is no elisp you can load
;;;				into an emacs18 to make files compiled this
;;;				way work.
;;; byte-compile-single-version	Normally the byte-compiler will consult the
;;;				above two variables at runtime, but if this 
;;;				variable is true when the compiler itself is
;;;				compiled, then the runtime checks will not be
;;;				made, and compilation will be slightly faster.
;;; elisp-source-extention-re	Regexp for the extention of elisp source-files;
;;;				see also the function byte-compile-dest-file.
;;; byte-compile-overwrite-file	If nil, delete old .elc files before saving.
;;;
;;; Most of the above parameters can also be set on a file-by-file basis; see
;;; the documentation of the `byte-compiler-options' macro.

;;; 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.  Elisp 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 make a given function be inline even if it has already been
;;;	defined with `defun' by using the `proclaim-inline' form like so:
;;;		(proclaim-inline my-function)
;;;	This is, in fact, exactly what `defsubst' does.  To make a function no
;;;	longer be inline, you must use `proclaim-notinline'.  Beware that if
;;;	you define a function with `defsubst' and later redefine it with 
;;;	`defun', it will still be open-coded until you use proclaim-notinline.
;;;
;;;  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
;;;     is analagous 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 Meta-X byte-compile-and-load-file does what you'd think.
;;;
;;;  o  The command elisp-compile-defun is analogous to eval-defun.
;;;
;;;  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.

(or (fboundp 'defsubst)
    ;; This really ought to be loaded already!
    (load-library "bytecomp-runtime"))

(eval-when-compile
  (defvar byte-compile-single-version nil
    "If this is true, the choice of emacs version (v18 or v19) byte-codes will
be hard-coded into bytecomp when it compiles itself.  If the compiler itself
is compiled with optimization, this causes a speedup.")

  (cond (byte-compile-single-version
	 (defmacro byte-compile-single-version () t)
	 (defmacro byte-compile-version-cond (cond) (list 'quote (eval cond))))
	(t
	 (defmacro byte-compile-single-version () nil)
	 (defmacro byte-compile-version-cond (cond) cond)))
  )

;;; 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.

(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)
	  (defmacro compiled-function-p (x) "Emacs 18 doesn't have these." nil)
	(defun compiled-function-p (x) "Emacs 18 doesn't have these." nil))

      (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 elisp-source-extention-re (if (eq system-type 'vax-vms)
				      "\\.EL\\(;[0-9]+\\)?$"
				    "\\.el$")
  "*Regexp which matches the extention of elisp source-files.
You may want to redefine defun byte-compile-dest-file to match this.")

(or (fboundp 'byte-compile-dest-file)
    ;; The user may want to redefine this along with elisp-source-extention-re,
    ;; so only define it if it is undefined.
    (defun byte-compile-dest-file (filename)
      "Converts an emacs-lisp source-filename to a compiled-filename."
      (setq filename (file-name-sans-versions filename))
      (cond ((eq system-type 'vax-vms)
	     (concat (substring filename 0 (string-match ";" filename)) "c"))
	    ((string-match elisp-source-extention-re filename)
	     (concat (substring filename 0 (match-beginning 0)) ".elc"))
	    (t (concat filename "c")))))

;; This can be the 'byte-compile property of any symbol.
(autoload 'byte-compile-inline-expand "byte-optimize")

;; This is the entrypoint to the lapcode optimizer pass1.
(autoload 'byte-optimize-form "byte-optimize")
;; This is the entrypoint to the lapcode optimizer pass2.
(autoload 'byte-optimize-lapcode "byte-optimize")
(autoload 'byte-compile-unfold-lambda "byte-optimize")

(defvar byte-compile-verbose
  (and (not noninteractive) (> baud-rate search-slow-speed))
  "*Non-nil means print messages describing progress of byte-compiler.")

(defvar byte-compile-emacs18-compatibility
  (or (and (boundp 'epoch::version) epoch::version)
      (string-lessp emacs-version "19"))
  "*If this is true, then the byte compiler will generate .elc files which will
work in generic version 18 emacses without having bytecomp-runtime.el loaded.
If this is false, the generated code will be more efficient in emacs 19, and
will be loadable in emacs 18 only if bytecomp-runtime.el is loaded.
See also byte-compile-generate-emacs19-bytecodes.")

(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 emacs19.  Code generated
this way can never be run in emacs18, and may even cause it to crash.")

(defvar byte-optimize t
  "*If nil, no compile-optimizations will be done.
Compilation will be faster, generated code will be slower and larger.
This may be nil, t, 'byte, or 'source.  If it is 'byte, then only byte-level
optimizations will be done; if it is 'source, then only source-level 
optimizations will be done.")

(defvar byte-compile-delete-errors t
  "*If non-nil, the optimizer may delete forms that may signal an error
(variable references and side-effect-free functions such as CAR).")

(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
  "*If true, the byte-compiler will report warnings with `error' instead
of `message.'")

(defconst byte-compile-warning-types '(redefine callargs free-vars unresolved))
(defvar byte-compile-warnings (not noninteractive)
  "*List of warnings that the byte-compiler should issue (t for all).
See doc of macro byte-compiler-options.")

(defvar byte-compile-generate-call-tree nil
  "*If this is true, then the compiler will collect statistics on what
functions were called and from where.  This will be displayed after the
compilation completes.  If it is non-nil, but not t, you will be asked
for whether to display this.

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
(that is, to which no calls have been compiled.)  Functions which can be
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
  "*If non nil, the call tree is sorted.
The values 'name, 'callers, 'calls, 'calls+callers means to sort on
the those fields.")

(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.")

(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)

(defconst byte-compile-initial-macro-environment
  '((byte-compiler-options . (lambda (&rest forms)
			       (apply 'byte-compiler-options-handler forms)))
    (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
  "Alist of (MACRONAME . DEFINITION) macros defined in the file which is being 
compiled.  It is (MACRONAME . nil) when a macro is redefined as a function.")

(defvar byte-compile-function-environment nil
  "Alist of (FUNCTIONNAME . DEFINITION) functions defined in the file which
is being compiled (this is so we can inline them if necessary).  It is
(FUNCTIONNAME . nil) when a function is redefined as a macro.")

(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")
;; codes 41-47 are consumed by the preceeding opcodes

;; 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")

(byte-defop 143 -2 byte-condition-case
  "for condition-case.  Takes, on stack, the variable to bind, 
an expression for the body, and a list of clauses")

(byte-defop 144  0 byte-temp-output-buffer-setup
  "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 145 -1 byte-temp-output-buffer-show
  "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")

;; these ops are new to v19
(byte-defop 146  0 byte-unbind-all "to unbind back to the beginning of 
this frame.  Not used yet, but wil be needed for tail-recursion elimination.")

;; 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)

;; unused: 169

;; New to v19.  These store their arg in the next byte.
(byte-defop 170  0 byte-rel-goto)
(byte-defop 171 -1 byte-rel-goto-if-nil)
(byte-defop 172 -1 byte-rel-goto-if-not-nil)
(byte-defop 173 -1 byte-rel-goto-if-nil-else-pop)
(byte-defop 174 -1 byte-rel-goto-if-not-nil-else-pop)

(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)
  "those byte-codes whose offset is a pc.")

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

(defconst byte-rel-goto-ops '(byte-rel-goto
			      byte-rel-goto-if-nil byte-rel-goto-if-not-nil
			      byte-rel-goto-if-nil-else-pop
			      byte-rel-goto-if-not-nil-else-pop)
  "byte-codes for relative jumps.")

(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))
	     (error "non-symbolic opcode %s" op))
	    ((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)))
    ;;    (error "compiler error: pc mismatch - %s %s" pc (length bytes)))
    (cond ((byte-compile-version-cond byte-compile-generate-emacs19-bytecodes)
	   ;; Make relative jumps
	   (setq patchlist (nreverse patchlist))
	   (while (progn
		    (setq off 0)	; PC change because of deleted bytes
		    (setq rest patchlist)
		    (while rest
		      (setq tmp (car rest))
		      (and (consp (car tmp)) ; Jump
			   (prog1 (null (nth 1 tmp)) ; Absolute jump
			     (setq tmp (car tmp)))
			   (progn
			     (setq rel (- (car (cdr tmp)) (car tmp)))
			     (and (<= -129 rel) (< rel 128)))
			   (progn
			     ;; Convert to relative jump.
			     (setcdr (car rest) (cdr (cdr (car rest))))
			     (setcar (cdr (car rest))
				     (+ (car (cdr (car rest)))
					(- byte-rel-goto byte-goto)))
			     (setq off (1- off))))
		      (setcar tmp (+ (car tmp) off)) ; Adjust PC
		      (setq rest (cdr rest)))
		    ;; If optimizing, repeat until no change.
		    (and byte-optimize
			 (not (zerop off)))))))
    ;; Patch PC into jumps
    (let (bytes)
      (while patchlist
	(setq bytes (car patchlist))
	(cond ((atom (car bytes)))	; Tag
	      ((nth 1 bytes)		; Relative jump
	       (setcar bytes (+ (- (car (cdr (car bytes))) (car (car bytes)))
				128)))
	      (t			; Absolute jump
	       (setq pc (car