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;;; bytecomp.el --- compilation of Lisp code into byte code
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;; Copyright (C) 1985, 1986, 1987, 1992, 1994, 1998, 2000, 2001, 2002,
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;;   2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
;;   Free Software Foundation, Inc.
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;; Author: Jamie Zawinski <jwz@lucid.com>
;;	Hallvard Furuseth <hbf@ulrik.uio.no>
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;; Maintainer: FSF
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;; Keywords: lisp
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;; Package: emacs
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;; This file is part of GNU Emacs.

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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
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;; 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
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;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:

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

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;;; Code:

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;; ========================================================================
;; Entry points:
;;	byte-recompile-directory, byte-compile-file,
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;;      byte-recompile-file,
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;;     batch-byte-compile, batch-byte-recompile-directory,
;;	byte-compile, compile-defun,
;;	display-call-tree
;; (byte-compile-buffer and byte-compile-and-load-file were turned off
;;  because they are not terribly useful and get in the way of completion.)

;; This version of the byte compiler has the following improvements:
;;  + optimization of compiled code:
;;    - removal of unreachable code;
;;    - removal of calls to side-effectless functions whose return-value
;;      is unused;
;;    - compile-time evaluation of safe constant forms, such as (consp nil)
;;      and (ash 1 6);
;;    - open-coding of literal lambdas;
;;    - peephole optimization of emitted code;
;;    - trivial functions are left uncompiled for speed.
;;  + support for inline functions;
;;  + compile-time evaluation of arbitrary expressions;
;;  + compile-time warning messages for:
;;    - functions being redefined with incompatible arglists;
;;    - functions being redefined as macros, or vice-versa;
;;    - functions or macros defined multiple times in the same file;
;;    - functions being called with the incorrect number of arguments;
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;;    - functions being called which are not defined globally, in the
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;;      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.

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;; User customization variables: M-x customize-group bytecomp
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;; New Features:
;;
;;  o	The form `defsubst' is just like `defun', except that the function
;;	generated will be open-coded in compiled code which uses it.  This
;;	means that no function call will be generated, it will simply be
;;	spliced in.  Lisp functions calls are very slow, so this can be a
;;	big win.
;;
;;	You can generally accomplish the same thing with `defmacro', but in
;;	that case, the defined procedure can't be used as an argument to
;;	mapcar, etc.
;;
;;  o	You can also open-code one particular call to a function without
;;	open-coding all calls.  Use the 'inline' form to do this, like so:
;;
;;		(inline (foo 1 2 3))	;; `foo' will be open-coded
;;	or...
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;;		(inline			;;  `foo' and `baz' will be
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;;		 (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
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;;	in without having to load that file before compiling it.  The
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;;	byte-compiler has been modified to remember function definitions in
;;	the compilation environment in the same way that it remembers macro
;;	definitions.
;;
;;  o  Forms like ((lambda ...) ...) are open-coded.
;;
;;  o  The form `eval-when-compile' is like progn, except that the body
;;     is evaluated at compile-time.  When it appears at top-level, this
;;     is analogous to the Common Lisp idiom (eval-when (compile) ...).
;;     When it does not appear at top-level, it is similar to the
;;     Common Lisp #. reader macro (but not in interpreted code).
;;
;;  o  The form `eval-and-compile' is similar to eval-when-compile, but
;;	the whole form is evalled both at compile-time and at run-time.
;;
;;  o  The command compile-defun is analogous to eval-defun.
;;
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;;  o  If you run byte-compile-file on a filename which is visited in a
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;;     buffer, and that buffer is modified, you are asked whether you want
;;     to save the buffer before compiling.
;;
;;  o  byte-compiled files now start with the string `;ELC'.
;;     Some versions of `file' can be customized to recognize that.
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(require 'backquote)
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(eval-when-compile (require 'cl))
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(or (fboundp 'defsubst)
    ;; This really ought to be loaded already!
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    (load "byte-run"))
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(defgroup bytecomp nil
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  "Emacs Lisp byte-compiler."
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  :group 'lisp)

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(defcustom emacs-lisp-file-regexp "\\.el\\'"
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  "Regexp which matches Emacs Lisp source files.
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If you change this, you might want to set `byte-compile-dest-file-function'."
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  :group 'bytecomp
  :type 'regexp)
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(defcustom byte-compile-dest-file-function nil
  "Function for the function `byte-compile-dest-file' to call.
It should take one argument, the name of an Emacs Lisp source
file name, and return the name of the compiled file."
  :group 'bytecomp
  :type '(choice (const nil) function)
  :version "23.2")

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;; 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)))

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(or (fboundp 'byte-compile-dest-file)
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    ;; The user may want to redefine this along with emacs-lisp-file-regexp,
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    ;; so only define it if it is undefined.
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    ;; Note - redefining this function is obsolete as of 23.2.
    ;; Customize byte-compile-dest-file-function instead.
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    (defun byte-compile-dest-file (filename)
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      "Convert an Emacs Lisp source file name to a compiled file name.
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If `byte-compile-dest-file-function' is non-nil, uses that
function to do the work.  Otherwise, if FILENAME matches
`emacs-lisp-file-regexp' (by default, files with the extension `.el'),
adds `c' to it; otherwise adds `.elc'."
      (if byte-compile-dest-file-function
	  (funcall byte-compile-dest-file-function filename)
	(setq filename (file-name-sans-versions
			(byte-compiler-base-file-name filename)))
	(cond ((string-match emacs-lisp-file-regexp filename)
	       (concat (substring filename 0 (match-beginning 0)) ".elc"))
	      (t (concat filename ".elc"))))))
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;; This can be the 'byte-compile property of any symbol.
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(autoload 'byte-compile-inline-expand "byte-opt")
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;; This is the entrypoint to the lapcode optimizer pass1.
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(autoload 'byte-optimize-form "byte-opt")
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;; This is the entrypoint to the lapcode optimizer pass2.
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(autoload 'byte-optimize-lapcode "byte-opt")
(autoload 'byte-compile-unfold-lambda "byte-opt")
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;; 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")

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(defcustom byte-compile-verbose
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  (and (not noninteractive) (> baud-rate search-slow-speed))
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  "Non-nil means print messages describing progress of byte-compiler."
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  :group 'bytecomp
  :type 'boolean)
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(defcustom byte-optimize t
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  "Enable optimization in the byte compiler.
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Possible values are:
  nil      - no optimization
  t        - all optimizations
  `source' - source-level optimizations only
  `byte'   - code-level optimizations only"
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  :group 'bytecomp
  :type '(choice (const :tag "none" nil)
		 (const :tag "all" t)
		 (const :tag "source-level" source)
		 (const :tag "byte-level" byte)))

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(defcustom byte-compile-delete-errors nil
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  "If non-nil, the optimizer may delete forms that may signal an error.
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This includes variable references and calls to functions such as `car'."
  :group 'bytecomp
  :type 'boolean)
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(defvar byte-compile-dynamic nil
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  "If non-nil, compile function bodies so they load lazily.
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They are hidden in comments in the compiled file,
and each one is brought into core when the
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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.")
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;;;###autoload(put 'byte-compile-dynamic 'safe-local-variable 'booleanp)
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(defvar byte-compile-disable-print-circle nil
  "If non-nil, disable `print-circle' on printing a byte-compiled code.")
;;;###autoload(put 'byte-compile-disable-print-circle 'safe-local-variable 'booleanp)

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(defcustom byte-compile-dynamic-docstrings t
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  "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.
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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.

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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.

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This option is enabled by default because it reduces Emacs memory usage."
  :group 'bytecomp
  :type 'boolean)
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;;;###autoload(put 'byte-compile-dynamic-docstrings 'safe-local-variable 'booleanp)
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(defcustom byte-optimize-log nil
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  "If true, the byte-compiler will log its optimizations into *Compile-Log*.
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If this is 'source, then only source-level optimizations will be logged.
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If it is 'byte, then only byte-level optimizations will be logged."
  :group 'bytecomp
  :type '(choice (const :tag "none" nil)
		 (const :tag "all" t)
		 (const :tag "source-level" source)
		 (const :tag "byte-level" byte)))

(defcustom byte-compile-error-on-warn nil
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  "If true, the byte-compiler reports warnings with `error'."
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  :group 'bytecomp
  :type 'boolean)
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(defconst byte-compile-warning-types
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  '(redefine callargs free-vars unresolved
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	     obsolete noruntime cl-functions interactive-only
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	     make-local mapcar constants suspicious lexical)
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  "The list of warning types used when `byte-compile-warnings' is t.")
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(defcustom byte-compile-warnings t
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  "List of warnings that the byte-compiler should issue (t for all).
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Elements of the list may be:
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  free-vars   references to variables not in the current lexical scope.
  unresolved  calls to unknown functions.
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  callargs    function calls with args that don't match the definition.
  redefine    function name redefined from a macro to ordinary function or vice
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              versa, or redefined to take a different number of arguments.
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  obsolete    obsolete variables and functions.
  noruntime   functions that may not be defined at runtime (typically
              defined only under `eval-when-compile').
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  cl-functions    calls to runtime functions from the CL package (as
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		  distinguished from macros and aliases).
  interactive-only
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	      commands that normally shouldn't be called from Lisp code.
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  make-local  calls to make-variable-buffer-local that may be incorrect.
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  mapcar      mapcar called for effect.
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  constants   let-binding of, or assignment to, constants/nonvariables.
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  suspicious  constructs that usually don't do what the coder wanted.
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If the list begins with `not', then the remaining elements specify warnings to
suppress.  For example, (not mapcar) will suppress warnings about mapcar."
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  :group 'bytecomp
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  :type `(choice (const :tag "All" t)
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		 (set :menu-tag "Some"
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                      ,@(mapcar (lambda (x) `(const ,x))
                                byte-compile-warning-types))))
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;;;###autoload(put 'byte-compile-warnings 'safe-local-variable 'byte-compile-warnings-safe-p)

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;;;###autoload
(defun byte-compile-warnings-safe-p (x)
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  "Return non-nil if X is valid as a value of `byte-compile-warnings'."
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  (or (booleanp x)
      (and (listp x)
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           (if (eq (car x) 'not) (setq x (cdr x))
             t)
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	   (equal (mapcar
		   (lambda (e)
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		     (when (memq e byte-compile-warning-types)
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		       e))
		   x)
		  x))))
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(defun byte-compile-warning-enabled-p (warning)
  "Return non-nil if WARNING is enabled, according to `byte-compile-warnings'."
  (or (eq byte-compile-warnings t)
      (if (eq (car byte-compile-warnings) 'not)
          (not (memq warning byte-compile-warnings))
        (memq warning byte-compile-warnings))))

;;;###autoload
(defun byte-compile-disable-warning (warning)
  "Change `byte-compile-warnings' to disable WARNING.
If `byte-compile-warnings' is t, set it to `(not WARNING)'.
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Otherwise, if the first element is `not', add WARNING, else remove it.
Normally you should let-bind `byte-compile-warnings' before calling this,
else the global value will be modified."
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  (setq byte-compile-warnings
        (cond ((eq byte-compile-warnings t)
               (list 'not warning))
              ((eq (car byte-compile-warnings) 'not)
               (if (memq warning byte-compile-warnings)
                   byte-compile-warnings
                 (append byte-compile-warnings (list warning))))
              (t
               (delq warning byte-compile-warnings)))))

;;;###autoload
(defun byte-compile-enable-warning (warning)
  "Change `byte-compile-warnings' to enable WARNING.
If `byte-compile-warnings' is `t', do nothing.  Otherwise, if the
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first element is `not', remove WARNING, else add it.
Normally you should let-bind `byte-compile-warnings' before calling this,
else the global value will be modified."
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  (or (eq byte-compile-warnings t)
      (setq byte-compile-warnings
            (cond ((eq (car byte-compile-warnings) 'not)
                   (delq warning byte-compile-warnings))
                  ((memq warning byte-compile-warnings)
                   byte-compile-warnings)
                  (t
                   (append byte-compile-warnings (list warning)))))))

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(defvar byte-compile-interactive-only-functions
  '(beginning-of-buffer end-of-buffer replace-string replace-regexp
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    insert-file insert-buffer insert-file-literally previous-line next-line
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    goto-line comint-run delete-backward-char)
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  "List of commands that are not meant to be called from Lisp.")
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(defvar byte-compile-not-obsolete-vars nil
  "If non-nil, a list of variables that shouldn't be reported as obsolete.")

(defvar byte-compile-not-obsolete-funcs nil
  "If non-nil, a list of functions that shouldn't be reported as obsolete.")
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(defcustom byte-compile-generate-call-tree nil
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  "Non-nil means collect call-graph information when compiling.
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This records which functions were called and from where.
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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.
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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
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\(that is, to which no calls have been compiled).  Functions which can be
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invoked interactively are excluded from this list."
  :group 'bytecomp
  :type '(choice (const :tag "Yes" t) (const :tag "No" nil)
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		 (other :tag "Ask" lambda)))
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(defvar byte-compile-call-tree nil
  "Alist of functions and their call tree.
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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.")

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(defcustom byte-compile-call-tree-sort 'name
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  "If non-nil, sort the call tree.
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The values `name', `callers', `calls', `calls+callers'
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specify different fields to sort on."
  :group 'bytecomp
  :type '(choice (const name) (const callers) (const calls)
		 (const calls+callers) (const nil)))
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(defvar byte-compile-debug nil)
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(defvar byte-compile-constants nil
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  "List of all constants encountered during compilation of this form.")
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(defvar byte-compile-variables nil
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  "List of all variables encountered during compilation of this form.")
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(defvar byte-compile-bound-variables nil
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  "List of variables bound in the context of the current form.
This list lives partly on the stack.")
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(defvar byte-compile-const-variables nil
  "List of variables declared as constants during compilation of this file.")
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(defvar byte-compile-free-references)
(defvar byte-compile-free-assignments)

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(defvar byte-compiler-error-flag)

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(defconst byte-compile-initial-macro-environment
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  '(
;;     (byte-compiler-options . (lambda (&rest forms)
;; 			       (apply 'byte-compiler-options-handler forms)))
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    (eval-when-compile . (lambda (&rest body)
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			   (list 'quote
				 (byte-compile-eval (byte-compile-top-level
						     (cons 'progn body))))))
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    (eval-and-compile . (lambda (&rest body)
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			  (byte-compile-eval-before-compile (cons 'progn body))
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			  (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
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  "Alist of macros defined in the file being compiled.
Each element looks like (MACRONAME . DEFINITION).  It is
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\(MACRONAME . nil) when a macro is redefined as a function.")
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(defvar byte-compile-function-environment nil
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  "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
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\(FUNCTIONNAME . nil) when a function is redefined as a macro.
It is \(FUNCTIONNAME . t) when all we know is that it was defined,
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and we don't know the definition.  For an autoloaded function, DEFINITION
has the form (autoload . FILENAME).")
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(defvar byte-compile-unresolved-functions nil
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  "Alist of undefined functions to which calls have been compiled.
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This variable is only significant whilst compiling an entire buffer.
Used for warnings when a function is not known to be defined or is later
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defined with incorrect args.")
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(defvar byte-compile-noruntime-functions nil
  "Alist of functions called that may not be defined when the compiled code is run.
Used for warnings about calling a function that is defined during compilation
but won't necessarily be defined when the compiled file is loaded.")

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(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

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

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(defvar byte-stack+-info nil
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  "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))
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    (put 'byte-code-vector 'tmp-compile-time-value nil)
    (put 'byte-stack+-info 'tmp-compile-time-value nil)))
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;; 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")
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;; codes 8-47 are consumed by the preceding opcodes
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;; unused: 48-55

(byte-defop  56 -1 byte-nth)
(byte-defop  57  0 byte-symbolp)
(byte-defop  58  0 byte-consp)
(byte-defop  59  0 byte-stringp)
(byte-defop  60  0 byte-listp)
(byte-defop  61 -1 byte-eq)
(byte-defop  62 -1 byte-memq)
(byte-defop  63  0 byte-not)
(byte-defop  64  0 byte-car)
(byte-defop  65  0 byte-cdr)
(byte-defop  66 -1 byte-cons)
(byte-defop  67  0 byte-list1)
(byte-defop  68 -1 byte-list2)
(byte-defop  69 -2 byte-list3)
(byte-defop  70 -3 byte-list4)
(byte-defop  71  0 byte-length)
(byte-defop  72 -1 byte-aref)
(byte-defop  73 -2 byte-aset)
(byte-defop  74  0 byte-symbol-value)
(byte-defop  75  0 byte-symbol-function) ; this was commented out
(byte-defop  76 -1 byte-set)
(byte-defop  77 -1 byte-fset) ; this was commented out
(byte-defop  78 -1 byte-get)
(byte-defop  79 -2 byte-substring)
(byte-defop  80 -1 byte-concat2)
(byte-defop  81 -2 byte-concat3)
(byte-defop  82 -3 byte-concat4)
(byte-defop  83  0 byte-sub1)
(byte-defop  84  0 byte-add1)
(byte-defop  85 -1 byte-eqlsign)
(byte-defop  86 -1 byte-gtr)
(byte-defop  87 -1 byte-lss)
(byte-defop  88 -1 byte-leq)
(byte-defop  89 -1 byte-geq)
(byte-defop  90 -1 byte-diff)
(byte-defop  91  0 byte-negate)
(byte-defop  92 -1 byte-plus)
(byte-defop  93 -1 byte-max)
(byte-defop  94 -1 byte-min)
(byte-defop  95 -1 byte-mult) ; v19 only
(byte-defop  96  1 byte-point)
(byte-defop  98  0 byte-goto-char)
(byte-defop  99  0 byte-insert)
(byte-defop 100  1 byte-point-max)
(byte-defop 101  1 byte-point-min)
(byte-defop 102  0 byte-char-after)
(byte-defop 103  1 byte-following-char)
(byte-defop 104  1 byte-preceding-char)
(byte-defop 105  1 byte-current-column)
(byte-defop 106  0 byte-indent-to)
(byte-defop 107  0 byte-scan-buffer-OBSOLETE) ; no longer generated as of v18
(byte-defop 108  1 byte-eolp)
(byte-defop 109  1 byte-eobp)
(byte-defop 110  1 byte-bolp)
(byte-defop 111  1 byte-bobp)
(byte-defop 112  1 byte-current-buffer)
(byte-defop 113  0 byte-set-buffer)
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(byte-defop 114  0 byte-save-current-buffer
  "To make a binding to record the current buffer")
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(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
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  "to examine top-of-stack, jump and don't pop it if it's nil,
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otherwise pop it")
(byte-defop 134 -1 byte-goto-if-not-nil-else-pop
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  "to examine top-of-stack, jump and don't pop it if it's non nil,
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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")

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;; For condition-case.  Takes, on stack, the variable to bind,
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;; an expression for the body, and a list of clauses.
(byte-defop 143 -2 byte-condition-case)
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;; 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)
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;; 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)
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;; these ops are new to v19
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;; To unbind back to the beginning of this frame.
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;; Not used yet, but will be needed for tail-recursion elimination.
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(byte-defop 146  0 byte-unbind-all)
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;; 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)

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;; unused: 169-174
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(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)
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  "List of byte-codes whose offset is a pc.")
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(defconst byte-goto-always-pop-ops '(byte-goto-if-nil byte-goto-if-not-nil))

(byte-extrude-byte-code-vectors)

;;; lapcode generator
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;;
;; 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.
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(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
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	(patchlist nil))	; List of tags and goto's to patch
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    (while lap
      (setq op (car (car lap))
	    off (cdr (car lap)))
      (cond ((not (symbolp op))
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	     (error "Non-symbolic opcode `%s'" op))
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	    ((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)))
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    ;;    (error "Compiler error: pc mismatch - %s %s" pc (length bytes)))
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    ;; 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))
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	       (setcar bytes (lsh pc -8))
               ;; FIXME: Replace this by some workaround.
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               (if (> (car bytes) 255) (error "Bytecode overflow"))))
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	(setq patchlist (cdr patchlist))))
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    (apply 'unibyte-string (nreverse bytes))))
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;;; compile-time evaluation

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

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(defun byte-compile-eval (form)
  "Eval FORM and mark the functions defined therein.
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Each function's symbol gets added to `byte-compile-noruntime-functions'."
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  (let ((hist-orig load-history)
	(hist-nil-orig current-load-list))
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    (prog1 (eval form)
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      (when (byte-compile-warning-enabled-p 'noruntime)
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	(let ((hist-new load-history)
	      (hist-nil-new current-load-list))
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	  ;; Go through load-history, look for newly loaded files
	  ;; and mark all the functions defined therein.
	  (while (and hist-new (not (eq hist-new hist-orig)))
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	    (let ((xs (pop hist-new))
		  old-autoloads)
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	      ;; Make sure the file was not already loaded before.
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	      (unless (or (assoc (car xs) hist-orig)
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			  ;; Don't give both the "noruntime" and
			  ;; "cl-functions" warning for the same function.
			  ;; FIXME This seems incorrect - these are two
			  ;; independent warnings.  For example, you may be
			  ;; choosing to see the cl warnings but ignore them.
			  ;; You probably don't want to ignore noruntime in the
			  ;; same way.
			  (and (byte-compile-warning-enabled-p 'cl-functions)
			       (byte-compile-cl-file-p (car xs))))
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		(dolist (s xs)
		  (cond
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		   ((symbolp s)
		    (unless (memq s old-autoloads)
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		      (push s byte-compile-noruntime-functions)))
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		   ((and (consp s) (eq t (car s)))
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		    (push (cdr s) old-autoloads))
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		   ((and (consp s) (eq 'autoload (car s)))
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		    (push (cdr s) byte-compile-noruntime-functions)))))))
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	  ;; Go through current-load-list for the locally defined funs.
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	  (let (old-autoloads)
	    (while (and hist-nil-new (not (eq hist-nil-new hist-nil-orig)))
	      (let ((s (pop hist-nil-new)))
		(when (and (symbolp s) (not (memq s old-autoloads)))
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		  (push s byte-compile-noruntime-functions))
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		(when (and (consp s) (eq t (car s)))
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		  (push (cdr s) old-autoloads)))))))
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      (when (byte-compile-warning-enabled-p 'cl-functions)
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	(let ((hist-new load-history))
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	  ;; Go through load-history, looking for the cl files.
	  ;; Since new files are added at the start of load-history,
	  ;; we scan the new history until the tail matches the old.
	  (while (and (not byte-compile-cl-functions)
		      hist-new (not (eq hist-new hist-orig)))
	    ;; We used to check if the file had already been loaded,
	    ;; but it is better to check non-nil byte-compile-cl-functions.
	    (and (byte-compile-cl-file-p (car (pop hist-new)))
		 (byte-compile-find-cl-functions))))))))
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(defun byte-compile-eval-before-compile (form)
  "Evaluate FORM for `eval-and-compile'."
  (let ((hist-nil-orig current-load-list))
    (prog1 (eval form)
      ;; (eval-and-compile (require 'cl) turns off warnings for cl functions.
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      ;; FIXME Why does it do that - just as a hack?
      ;; There are other ways to do this nowadays.
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      (let ((tem current-load-list))
	(while (not (eq tem hist-nil-orig))
	  (when (equal (car tem) '(require . cl))
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            (byte-compile-disable-warning 'cl-functions))
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	  (setq tem (cdr tem)))))))
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;;; byte compiler messages

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(defvar byte-compile-current-form nil)
(defvar byte-compile-dest-file nil)
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(defvar byte-compile-current-file nil)
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(defvar byte-compile-current-group nil)
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(defvar byte-compile-current-buffer nil)
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;; Log something that isn't a warning.
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(defmacro byte-compile-log (format-string &rest args)
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  `(and
    byte-optimize
    (memq byte-optimize-log '(t source))
    (let ((print-escape-newlines t)
	  (print-level 4)
	  (print-length 4))
      (byte-compile-log-1
       (format
	,format-string
	,@(mapcar
	   (lambda (x) (if (symbolp x) (list 'prin1-to-string x) x))
	   args))))))
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;; Log something that isn't a warning.
(defun byte-compile-log-1 (string)
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  (with-current-buffer "*Compile-Log*"
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    (let ((inhibit-read-only t))
      (goto-char (point-max))
      (byte-compile-warning-prefix nil nil)
      (cond (noninteractive
	     (message " %s" string))
	    (t
	     (insert (format "%s\n" string)))))))
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(defvar byte-compile-read-position nil
  "Character position we began the last `read' from.")
(defvar byte-compile-last-position nil
  "Last known character position in the input.")

;; copied from gnus-util.el
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(defsubst byte-compile-delete-first (elt list)
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  (if (eq (car list) elt)
      (cdr list)
    (let ((total list))
      (while (and (cdr list)
		  (not (eq (cadr list) elt)))
	(setq list (cdr list)))
      (when (cdr list)
	(setcdr list (cddr list)))
      total)))

;; The purpose of this function is to iterate through the
;; `read-symbol-positions-list'.  Each time we process, say, a
;; function definition (`defun') we remove `defun' from
;; `read-symbol-positions-list', and set `byte-compile-last-position'
;; to that symbol's character position.  Similarly, if we encounter a
;; variable reference, like in (1+ foo), we remove `foo' from the
;; list.  If our current position is after the symbol's position, we
;; assume we've already passed that point, and look for the next
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;; occurrence of the symbol.
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;;
;; This function should not be called twice for the same occurrence of
;; a symbol, and it should not be called for symbols generated by the
;; byte compiler itself; because rather than just fail looking up the
;; symbol, we may find an occurrence of the symbol further ahead, and
;; then `byte-compile-last-position' as advanced too far.
;;
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;; So your're probably asking yourself: Isn't this function a
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;; gross hack?  And the answer, of course, would be yes.
(defun byte-compile-set-symbol-position (sym &optional allow-previous)
  (when byte-compile-read-position
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    (let (last entry)
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      (while (progn
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	       (setq last byte-compile-last-position
		     entry (assq sym read-symbol-positions-list))
	       (when entry
		 (setq byte-compile-last-position
		       (+ byte-compile-read-position (cdr entry))
		       read-symbol-positions-list
		       (byte-compile-delete-first
			entry read-symbol-positions-list)))
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	       (or (and allow-previous (not (= last byte-compile-last-position)))
		   (> last byte-compile-last-position)))))))
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(defvar byte-compile-last-warned-form nil)
(defvar byte-compile-last-logged-file nil)

;; This is used as warning-prefix for the compiler.
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;; It is always called with the warnings buffer current.
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(defun byte-compile-warning-prefix (level entry)
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  (let* ((inhibit-read-only t)
	 (dir default-directory)
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	 (file (cond ((stringp byte-compile-current-file)
		      (format "%s:" (file-relative-name byte-compile-current-file dir)))
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		     ((bufferp byte-compile-current-file)
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		      (format "Buffer %s:"
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			      (buffer-name byte-compile-current-file)))
		     (t "")))
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	 (pos (if (and byte-compile-current-file
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		       (integerp byte-compile-read-position))
		  (with-current-buffer byte-compile-current-buffer
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		    (format "%d:%d:"
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			    (save-excursion
			      (goto-char byte-compile-last-position)
			      (1+ (count-lines (point-min) (point-at-bol))))
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			    (save-excursion
			      (goto-char byte-compile-last-position)
			      (1+ (current-column)))))
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		""))
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	 (form (if (eq byte-compile-current-form :end) "end of data"
		 (or byte-compile-current-form "toplevel form"))))
    (when (or (and byte-compile-current-file
		   (not (equal byte-compile-current-file
			       byte-compile-last-logged-file)))
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	      (and byte-compile-current-form
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		   (not (eq byte-compile-current-form
			    byte-compile-last-warned-form))))
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      (insert (format "\nIn %s:\n" form)))
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    (when level
      (insert (format "%s%s" file pos))))
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  (setq byte-compile-last-logged-file byte-compile-current-file
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	byte-compile-last-warned-form byte-compile-current-form)
  entry)
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;; This no-op function is used as the value of warning-series
;; to tell inner calls to displaying-byte-compile-warnings
;; not to bind warning-series.
(defun byte-compile-warning-series (&rest ignore)
  nil)

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;; (compile-mode) will cause this to be loaded.
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(declare-function compilation-forget-errors "compile" ())
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;; Log the start of a file in *Compile-Log*, and mark it as done.
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;; Return the position of the start of the page in the log buffer.
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;; But do nothing in batch mode.
(defun byte-compile-log-file ()
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  (and (not (equal byte-compile-current-file byte-compile-last-logged-file))
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       (not noninteractive)
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       (with-current-buffer (get-buffer-create "*Compile-Log*")
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	 (goto-char (point-max))
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	 (let* ((inhibit-read-only t)
		(dir (and byte-compile-current-file
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			  (file-name-directory byte-compile-current-file)))
		(was-same (equal default-directory dir))
		pt)
	   (when dir
	     (unless was-same
	       (insert (format "Leaving directory `%s'\n" default-directory))))
	   (unless (bolp)
	     (insert "\n"))
	   (setq pt (point-marker))
	   (if byte-compile-current-file
	       (insert "\f\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")
	     (insert "\f\nCompiling no file at " (current-time-string) "\n"))
	   (when dir
	     (setq default-directory dir)
	     (unless was-same
	       (insert (format "Entering directory `%s'\n" default-directory))))
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	   (setq byte-compile-last-logged-file byte-compile-current-file
		 byte-compile-last-warned-form nil)
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	   ;; Do this after setting default-directory.
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	   (unless (derived-mode-p 'compilation-mode) (compilation-mode))
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	   (compilation-forget-errors)
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	   pt))))

;; Log a message STRING in *Compile-Log*.
;; Also log the current function and file if not already done.
(defun byte-compile-log-warning (string &optional fill level)
  (let ((warning-prefix-function 'byte-compile-warning-prefix)
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	(warning-type-format "")
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	(warning-fill-prefix (if fill "    "))
	(inhibit-read-only t))
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    (display-warning 'bytecomp string level "*Compile-Log*")))
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(defun byte-compile-warn (format &rest args)
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  "Issue a byte compiler warning; use (format FORMAT ARGS...) for message."
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  (setq format (apply 'format format args))
  (if byte-compile-error-on-warn
      (error "%s" format)		; byte-compile-file catches and logs it
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    (byte-compile-log-warning format t :warning)))