* doc/lispref/variables.texi (Scope): Mention the availability of lexbind.

[emacs.git] / lisp / emacs-lisp / bytecomp.el

;;; bytecomp.el --- compilation of Lisp code into byte code

;; Copyright (C) 1985-1987, 1992, 1994, 1998, 2000-2011
;;   Free Software Foundation, Inc.

;; Author: Jamie Zawinski <jwz@lucid.com>
;;      Hallvard Furuseth <hbf@ulrik.uio.no>
;; Maintainer: FSF
;; Keywords: lisp
;; Package: emacs

;; 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 3 of the License, 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.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:

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

;;; Code:

;; ========================================================================
;; Entry points:
;;      byte-recompile-directory, byte-compile-file,
;;      byte-recompile-file,
;;     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;
;;    - 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: M-x customize-group bytecomp

;; 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...
;;              (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 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.
;;
;;  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.
;;
;;  o  byte-compiled files now start with the string `;ELC'.
;;     Some versions of `file' can be customized to recognize that.

(require 'backquote)
(require 'macroexp)
(require 'cconv)
(eval-when-compile (require 'cl))

(or (fboundp 'defsubst)
    ;; This really ought to be loaded already!
    (load "byte-run"))

;; 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)


(defgroup bytecomp nil
  "Emacs Lisp byte-compiler."
  :group 'lisp)

(defcustom emacs-lisp-file-regexp "\\.el\\'"
  "Regexp which matches Emacs Lisp source files.
If you change this, you might want to set `byte-compile-dest-file-function'."
  :group 'bytecomp
  :type 'regexp)

(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")

;; 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)))

(or (fboundp 'byte-compile-dest-file)
    ;; The user may want to redefine this along with emacs-lisp-file-regexp,
    ;; so only define it if it is undefined.
    ;; Note - redefining this function is obsolete as of 23.2.
    ;; Customize byte-compile-dest-file-function instead.
    (defun byte-compile-dest-file (filename)
      "Convert an Emacs Lisp source file name to a compiled file name.
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"))))))

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

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

;; 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")

(defcustom byte-compile-verbose
  (and (not noninteractive) (> baud-rate search-slow-speed))
  "Non-nil means print messages describing progress of byte-compiler."
  :group 'bytecomp
  :type 'boolean)

(defcustom byte-optimize t
  "Enable optimization in the byte compiler.
Possible values are:
  nil      - no optimization
  t        - all optimizations
  `source' - source-level optimizations only
  `byte'   - code-level optimizations only"
  :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-delete-errors nil
  "If non-nil, the optimizer may delete forms that may signal an error.
This includes variable references and calls to functions such as `car'."
  :group 'bytecomp
  :type 'boolean)

(defvar byte-compile-dynamic nil
  "If non-nil, compile function bodies so they load lazily.
They are hidden in comments in the compiled file,
and each one is 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.")
;;;###autoload(put 'byte-compile-dynamic 'safe-local-variable 'booleanp)

(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)

(defcustom 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.

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.

This option is enabled by default because it reduces Emacs memory usage."
  :group 'bytecomp
  :type 'boolean)
;;;###autoload(put 'byte-compile-dynamic-docstrings 'safe-local-variable 'booleanp)

(defconst byte-compile-log-buffer "*Compile-Log*"
  "Name of the byte-compiler's log buffer.")

(defcustom byte-optimize-log nil
  "If non-nil, the byte-compiler will log its optimizations.
If this is 'source, then only source-level optimizations will be logged.
If it is 'byte, then only byte-level optimizations will be logged.
The information is logged to `byte-compile-log-buffer'."
  :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
  "If true, the byte-compiler reports warnings with `error'."
  :group 'bytecomp
  :type 'boolean)

(defconst byte-compile-warning-types
  '(redefine callargs free-vars unresolved
             obsolete noruntime cl-functions interactive-only
             make-local mapcar constants suspicious lexical)
  "The list of warning types used when `byte-compile-warnings' is t.")
(defcustom byte-compile-warnings t
  "List of warnings that the byte-compiler should issue (t for all).

Elements of the list may be:

  free-vars   references to variables not in the current lexical scope.
  unresolved  calls to unknown functions.
  callargs    function calls with args that don't match the definition.
  redefine    function name redefined from a macro to ordinary function or vice
              versa, or redefined to take a different number of arguments.
  obsolete    obsolete variables and functions.
  noruntime   functions that may not be defined at runtime (typically
              defined only under `eval-when-compile').
  cl-functions    calls to runtime functions from the CL package (as
                  distinguished from macros and aliases).
  interactive-only
              commands that normally shouldn't be called from Lisp code.
  make-local  calls to make-variable-buffer-local that may be incorrect.
  mapcar      mapcar called for effect.
  constants   let-binding of, or assignment to, constants/nonvariables.
  suspicious  constructs that usually don't do what the coder wanted.

If the list begins with `not', then the remaining elements specify warnings to
suppress.  For example, (not mapcar) will suppress warnings about mapcar."
  :group 'bytecomp
  :type `(choice (const :tag "All" t)
                 (set :menu-tag "Some"
                      ,@(mapcar (lambda (x) `(const ,x))
                                byte-compile-warning-types))))

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

(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)'.
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."
  (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
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."
  (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)))))))

(defvar byte-compile-interactive-only-functions
  '(beginning-of-buffer end-of-buffer replace-string replace-regexp
    insert-file insert-buffer insert-file-literally previous-line next-line
    goto-line comint-run delete-backward-char)
  "List of commands that are not meant to be called from Lisp.")

(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.")

(defcustom byte-compile-generate-call-tree nil
  "Non-nil means collect call-graph information when compiling.
This records which 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.

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."
  :group 'bytecomp
  :type '(choice (const :tag "Yes" t) (const :tag "No" nil)
                 (other :tag "Ask" lambda)))

(defvar 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.")

(defcustom byte-compile-call-tree-sort 'name
  "If non-nil, sort the call tree.
The values `name', `callers', `calls', `calls+callers'
specify different fields to sort on."
  :group 'bytecomp
  :type '(choice (const name) (const callers) (const calls)
                 (const calls+callers) (const nil)))

(defvar byte-compile-debug t)
(setq debug-on-error t)

(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 dynamic variables bound in the context of the current form.
This list lives partly on the stack.")
(defvar byte-compile-const-variables nil
  "List of variables declared as constants during compilation of this file.")
(defvar byte-compile-free-references)
(defvar byte-compile-free-assignments)

(defvar byte-compiler-error-flag)

(defconst byte-compile-initial-macro-environment
  '(
;;     (byte-compiler-options . (lambda (&rest forms)
;;                             (apply 'byte-compiler-options-handler forms)))
    (declare-function . byte-compile-macroexpand-declare-function)
    (eval-when-compile . (lambda (&rest body)
                           (list
                            'quote
                            (byte-compile-eval
                              (byte-compile-top-level
                               (macroexpand-all
                                (cons 'progn body)
                                byte-compile-initial-macro-environment))))))
    (eval-and-compile . (lambda (&rest body)
                          (byte-compile-eval-before-compile (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 macros defined in the file being compiled.
Each element looks like (MACRONAME . DEFINITION).  It is
\(MACRONAME . nil) when a macro is redefined as a function.")

(defvar byte-compile-function-environment nil
  "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.
It is \(FUNCTIONNAME . t) when all we know is that it was defined,
and we don't know the definition.  For an autoloaded function, DEFINITION
has the form (autoload . FILENAME).")

(defvar byte-compile-unresolved-functions nil
  "Alist of undefined functions to which calls have been compiled.
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
defined with incorrect args.")

(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.")

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

(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.")

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

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

(defvar 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))
    (put 'byte-code-vector 'tmp-compile-time-value nil)
    (put 'byte-stack+-info 'tmp-compile-time-value nil)))


;; These opcodes are special in that they pack their argument into the
;; opcode word.
;;
(byte-defop   0  1 byte-stack-ref "for stack reference")
(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 8-47 are consumed by the preceding 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  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  0 byte-save-current-buffer
  "To make a binding to record the current buffer")
(byte-defop 115  0 byte-set-mark-OBSOLETE)

;; 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 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")

;; 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)

;; 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)

;; 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)

;; these ops are new to v19

;; To unbind back to the beginning of this frame.
;; Not used yet, but will be needed for tail-recursion elimination.
(byte-defop 146  0 byte-unbind-all)

;; 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: 169-174

(byte-defop 175 nil byte-listN)
(byte-defop 176 nil byte-concatN)
(byte-defop 177 nil byte-insertN)

(byte-defop 178 -1 byte-stack-set)      ; stack offset in following one byte
(byte-defop 179 -1 byte-stack-set2)     ; stack offset in following two bytes

;; if (following one byte & 0x80) == 0
;;    discard (following one byte & 0x7F) stack entries
;; else
;;    discard (following one byte & 0x7F) stack entries _underneath_ the top of stack
;;    (that is, if the operand = 0x83,  ... X Y Z T  =>  ... T)
(byte-defop 182 nil byte-discardN)
;; `byte-discardN-preserve-tos' is a pseudo-op that gets turned into
;; `byte-discardN' with the high bit in the operand set (by
;; `byte-compile-lapcode').
(defconst byte-discardN-preserve-tos byte-discardN)

;; unused: 182-191

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

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

(byte-extrude-byte-code-vectors)
\f
;;; 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.

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

(defmacro byte-compile-push-bytecode-const2 (opcode const2 bytes pc)
  "Push OPCODE and the two-byte constant CONST2 onto BYTES, and add 3 to PC.
CONST2 may be evaulated multiple times."
  `(byte-compile-push-bytecodes ,opcode (logand ,const2 255) (lsh ,const2 -8)
                                ,bytes ,pc))

(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
        opcode                  ; numeric value of OP
        (bytes '())             ; Put the output bytes here
        (patchlist nil))        ; List of gotos to patch
    (dolist (lap-entry lap)
      (setq op (car lap-entry)
            off (cdr lap-entry))
      (cond
       ((not (symbolp op))
        (error "Non-symbolic opcode `%s'" op))
       ((eq op 'TAG)
        (setcar off pc))
       ((null op)
        ;; a no-op added by `byte-compile-delay-out'
        (unless (zerop off)
          (error
           "Placeholder added by `byte-compile-delay-out' not filled in.")
          ))
       (t
        (setq opcode
              (if (eq op 'byte-discardN-preserve-tos)
                  ;; byte-discardN-preserve-tos is a pseudo op, which
                  ;; is actually the same as byte-discardN
                  ;; with a modified argument.
                  byte-discardN
                (symbol-value op)))
        (cond ((memq op byte-goto-ops)
               ;; goto
               (byte-compile-push-bytecodes opcode nil (cdr off) bytes pc)
               (push bytes patchlist)) 
              ((or (and (consp off)
                        ;; Variable or constant reference
                        (progn
                          (setq off (cdr off))
                          (eq op 'byte-constant)))
                   (and (eq op 'byte-constant) ;; 'byte-closed-var
                        (integerp off)))
               ;; constant ref
               (if (< off byte-constant-limit)
                   (byte-compile-push-bytecodes (+ byte-constant off)
                                                bytes pc)
                 (byte-compile-push-bytecode-const2 byte-constant2 off
                                                    bytes pc)))
              ((and (= opcode byte-stack-set)
                    (> off 255))
               ;; Use the two-byte version of byte-stack-set if the
               ;; offset is too large for the normal version.
               (byte-compile-push-bytecode-const2 byte-stack-set2 off
                                                  bytes pc))
              ((and (>= opcode byte-listN)
                    (< opcode byte-discardN))
               ;; These insns all put their operand into one extra byte.
               (byte-compile-push-bytecodes opcode off bytes pc))
              ((= opcode byte-discardN)
               ;; byte-discardN is weird in that it encodes a flag in the
               ;; top bit of its one-byte argument.  If the argument is
               ;; too large to fit in 7 bits, the opcode can be repeated.
               (let ((flag (if (eq op 'byte-discardN-preserve-tos) #x80 0)))
                 (while (> off #x7f)
                   (byte-compile-push-bytecodes opcode (logior #x7f flag) bytes pc)
                   (setq off (- off #x7f)))
                 (byte-compile-push-bytecodes opcode (logior off flag) bytes pc)))
              ((null off)
               ;; opcode that doesn't use OFF
               (byte-compile-push-bytecodes opcode bytes pc))
              ((and (eq opcode byte-stack-ref) (eq off 0))
               ;; (stack-ref 0) is really just another name for `dup'.
               (debug)                 ;FIXME: When would this happen?
               (byte-compile-push-bytecodes byte-dup bytes pc))
              ;; The following three cases are for the special
              ;; insns that encode their operand into 0, 1, or 2
              ;; extra bytes depending on its magnitude.
              ((< off 6)
               (byte-compile-push-bytecodes (+ opcode off) bytes pc))
              ((< off 256)
               (byte-compile-push-bytecodes (+ opcode 6) off bytes pc))
              (t
               (byte-compile-push-bytecode-const2 (+ opcode 7) off
                                                  bytes pc))))))
    ;;(if (not (= pc (length bytes)))
    ;;    (error "Compiler error: pc mismatch - %s %s" pc (length bytes)))

    ;; Patch tag PCs into absolute jumps
    (dolist (bytes-tail patchlist)
      (setq pc (caar bytes-tail))       ; Pick PC from goto's tag
      (setcar (cdr bytes-tail) (logand pc 255))
      (setcar bytes-tail (lsh pc -8))
      ;; FIXME: Replace this by some workaround.
      (if (> (car bytes) 255) (error "Bytecode overflow")))

    (apply 'unibyte-string (nreverse bytes))))

\f
;;; compile-time evaluation

(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))))

(defun byte-compile-eval (form)
  "Eval FORM and mark the functions defined therein.
Each function's symbol gets added to `byte-compile-noruntime-functions'."
  (let ((hist-orig load-history)
        (hist-nil-orig current-load-list))
    (prog1 (eval form)
      (when (byte-compile-warning-enabled-p 'noruntime)
        (let ((hist-new load-history)
              (hist-nil-new current-load-list))
          ;; 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)))
            (let ((xs (pop hist-new))
                  old-autoloads)
              ;; Make sure the file was not already loaded before.
              (unless (or (assoc (car xs) hist-orig)
                          ;; 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))))
                (dolist (s xs)
                  (cond
                   ((symbolp s)
                    (unless (memq s old-autoloads)
                      (push s byte-compile-noruntime-functions)))
                   ((and (consp s) (eq t (car s)))
                    (push (cdr s) old-autoloads))
                   ((and (consp s) (eq 'autoload (car s)))
                    (push (cdr s) byte-compile-noruntime-functions)))))))
          ;; Go through current-load-list for the locally defined funs.
          (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)))
                  (push s byte-compile-noruntime-functions))
                (when (and (consp s) (eq t (car s)))
                  (push (cdr s) old-autoloads)))))))
      (when (byte-compile-warning-enabled-p 'cl-functions)
        (let ((hist-new load-history))
          ;; 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))))))))

(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.
      ;; FIXME Why does it do that - just as a hack?
      ;; There are other ways to do this nowadays.
      (let ((tem current-load-list))
        (while (not (eq tem hist-nil-orig))
          (when (equal (car tem) '(require . cl))
            (byte-compile-disable-warning 'cl-functions))
          (setq tem (cdr tem)))))))
\f
;;; byte compiler messages

(defvar byte-compile-current-form nil)
(defvar byte-compile-dest-file nil)
(defvar byte-compile-current-file nil)
(defvar byte-compile-current-group nil)
(defvar byte-compile-current-buffer nil)

;; Log something that isn't a warning.
(defmacro byte-compile-log (format-string &rest args)
  `(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))))))

;; Log something that isn't a warning.
(defun byte-compile-log-1 (string)
  (with-current-buffer byte-compile-log-buffer
    (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)))))))

(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
(defsubst byte-compile-delete-first (elt list)
  (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
;; occurrence of the symbol.
;;
;; 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.
;;
;; So your're probably asking yourself: Isn't this function a
;; 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
    (let (last entry)
      (while (progn
               (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)))
               (or (and allow-previous (not (= last byte-compile-last-position)))
                   (> last byte-compile-last-position)))))))

(defvar byte-compile-last-warned-form nil)
(defvar byte-compile-last-logged-file nil)

;; This is used as warning-prefix for the compiler.
;; It is always called with the warnings buffer current.
(defun byte-compile-warning-prefix (level entry)
  (let* ((inhibit-read-only t)
         (dir default-directory)
         (file (cond ((stringp byte-compile-current-file)
                      (format "%s:" (file-relative-name byte-compile-current-file dir)))
                     ((bufferp byte-compile-current-file)
                      (format "Buffer %s:"
                              (buffer-name byte-compile-current-file)))
                     (t "")))
         (pos (if (and byte-compile-current-file
                       (integerp byte-compile-read-position))
                  (with-current-buffer byte-compile-current-buffer
                    (format "%d:%d:"
                            (save-excursion
                              (goto-char byte-compile-last-position)
                              (1+ (count-lines (point-min) (point-at-bol))))
                            (save-excursion
                              (goto-char byte-compile-last-position)
                              (1+ (current-column)))))
                ""))
         (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)))
              (and byte-compile-current-form
                   (not (eq byte-compile-current-form
                            byte-compile-last-warned-form))))
      (insert (format "\nIn %s:\n" form)))
    (when level
      (insert (format "%s%s" file pos))))
  (setq byte-compile-last-logged-file byte-compile-current-file
        byte-compile-last-warned-form byte-compile-current-form)
  entry)

;; 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)

;; (compile-mode) will cause this to be loaded.
(declare-function compilation-forget-errors "compile" ())

;; Log the start of a file in `byte-compile-log-buffer', and mark it as done.
;; Return the position of the start of the page in the log buffer.
;; But do nothing in batch mode.
(defun byte-compile-log-file ()
  (and (not (equal byte-compile-current-file byte-compile-last-logged-file))
       (not noninteractive)
       (with-current-buffer (get-buffer-create byte-compile-log-buffer)
         (goto-char (point-max))
         (let* ((inhibit-read-only t)
                (dir (and byte-compile-current-file
                          (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))))
           (setq byte-compile-last-logged-file byte-compile-current-file
                 byte-compile-last-warned-form nil)
           ;; Do this after setting default-directory.
           (unless (derived-mode-p 'compilation-mode) (compilation-mode))
           (compilation-forget-errors)
           pt))))

;; Log a message STRING in `byte-compile-log-buffer'.
;; 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)
        (warning-type-format "")
        (warning-fill-prefix (if fill "    "))
        (inhibit-read-only t))
    (display-warning 'bytecomp string level byte-compile-log-buffer)))

(defun byte-compile-warn (format &rest args)
  "Issue a byte compiler warning; use (format FORMAT ARGS...) for message."
  (setq format (apply 'format format args))
  (if byte-compile-error-on-warn
      (error "%s" format)               ; byte-compile-file catches and logs it
    (byte-compile-log-warning format t :warning)))

(defun byte-compile-warn-obsolete (symbol)
  "Warn that SYMBOL (a variable or function) is obsolete."
  (when (byte-compile-warning-enabled-p 'obsolete)
    (let* ((funcp (get symbol 'byte-obsolete-info))
           (obsolete (or funcp (get symbol 'byte-obsolete-variable)))
           (instead (car obsolete))
           (asof (if funcp (nth 2 obsolete) (cdr obsolete))))
      (unless (and funcp (memq symbol byte-compile-not-obsolete-funcs))
        (byte-compile-warn "`%s' is an obsolete %s%s%s" symbol
                           (if funcp "function" "variable")
                           (if asof (concat " (as of Emacs " asof ")") "")
                           (cond ((stringp instead)
                                  (concat "; " instead))
                                 (instead
                                  (format "; use `%s' instead." instead))
                                 (t ".")))))))

(defun byte-compile-report-error (error-info)
  "Report Lisp error in compilation.  ERROR-INFO is the error data."
  (setq byte-compiler-error-flag t)
  (byte-compile-log-warning
   (error-message-string error-info)
   nil :error))
\f
;;; sanity-checking arglists

(defun byte-compile-fdefinition (name macro-p)
  ;; If a function has an entry saying (FUNCTION . t).
  ;; that means we know it is defined but we don't know how.
  ;; If a function has an entry saying (FUNCTION . nil),
  ;; that means treat it as not defined.
  (let* ((list (if macro-p
                   byte-compile-macro-environment
                 byte-compile-function-environment))
         (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)
                               (byte-code-function-p (symbol-function fn)))))
            (setq fn (symbol-function fn)))
          (let ((advertised (gethash (if (and (symbolp fn) (fboundp fn))
                                         ;; Could be a subr.
                                         (symbol-function fn)
                                       fn)
                                     advertised-signature-table t)))
            (cond
             ((listp advertised)
              (if macro-p
                  `(macro lambda ,advertised)
                `(lambda ,advertised)))
             ((and (not macro-p) (byte-code-function-p fn)) fn)
             ((not (consp fn)) nil)
             ((eq 'macro (car fn)) (cdr fn))
             (macro-p nil)
             ((eq 'autoload (car fn)) nil)
             (t 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))    ; took 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)))))


;; Warn if the form is calling a function with the wrong number of arguments.
(defun byte-compile-callargs-warn (form)
  (let* ((def (or (byte-compile-fdefinition (car form) nil)
                  (byte-compile-fdefinition (car form) t)))
         (sig (if (and def (not (eq def t)))
                  (progn
                    (and (eq (car-safe def) 'macro)
                         (eq (car-safe (cdr-safe def)) 'lambda)
                         (setq def (cdr def)))
                    (byte-compile-arglist-signature
                     (if (memq (car-safe def) '(declared lambda))
                         (nth 1 def)
                       (if (byte-code-function-p def)
                           (aref def 0)
                         '(&rest def)))))
                (if (and (fboundp (car form))
                         (subrp (symbol-function (car form))))
                    (subr-arity (symbol-function (car form))))))
         (ncall (length (cdr form))))
    ;; Check many or unevalled from subr-arity.
    (if (and (cdr-safe sig)
             (not (numberp (cdr sig))))
        (setcdr sig nil))
    (if sig
        (when (or (< ncall (car sig))
                (and (cdr sig) (> ncall (cdr sig))))
          (byte-compile-set-symbol-position (car form))
          (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))))
    (byte-compile-format-warn form)
    ;; Check to see if the function will be available at runtime
    ;; and/or remember its arity if it's unknown.
    (or (and (or def (fboundp (car form))) ; might be a subr or autoload.
             (not (memq (car form) byte-compile-noruntime-functions)))
        (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))))
            (push (list (car form) n)
                  byte-compile-unresolved-functions))))))

(defun byte-compile-format-warn (form)
  "Warn if FORM is `format'-like with inconsistent args.
Applies if head of FORM is a symbol with non-nil property
`byte-compile-format-like' and first arg is a constant string.
Then check the number of format fields matches the number of
extra args."
  (when (and (symbolp (car form))
             (stringp (nth 1 form))
             (get (car form) 'byte-compile-format-like))
    (let ((nfields (with-temp-buffer
                     (insert (nth 1 form))
                     (goto-char (point-min))
                     (let ((n 0))
                       (while (re-search-forward "%." nil t)
                         (unless (eq ?% (char-after (1+ (match-beginning 0))))
                           (setq n (1+ n))))
                       n)))
          (nargs (- (length form) 2)))
      (unless (= nargs nfields)
        (byte-compile-warn
         "`%s' called with %d args to fill %d format field(s)" (car form)
         nargs nfields)))))

(dolist (elt '(format message error))
  (put elt 'byte-compile-format-like t))

;; Warn if a custom definition fails to specify :group.
(defun byte-compile-nogroup-warn (form)
  (if (and (memq (car form) '(custom-declare-face custom-declare-variable))
           byte-compile-current-group)
      ;; The group will be provided implicitly.
      nil
    (let ((keyword-args (cdr (cdr (cdr (cdr form)))))
          (name (cadr form)))
      (or (not (eq (car-safe name) 'quote))
        (and (eq (car form) 'custom-declare-group)
             (equal name ''emacs))
        (plist-get keyword-args :group)
        (not (and (consp name) (eq (car name) 'quote)))
        (byte-compile-warn
         "%s for `%s' fails to specify containing group"
         (cdr (assq (car form)
                      '((custom-declare-group . defgroup)
                        (custom-declare-face . defface)
                        (custom-declare-variable . defcustom))))
           (cadr name)))
      ;; Update the current group, if needed.
      (if (and byte-compile-current-file ;Only when byte-compiling a whole file.
               (eq (car form) 'custom-declare-group)
               (eq (car-safe name) 'quote))
          (setq byte-compile-current-group (cadr name))))))

;; Warn if the function or macro is being redefined with a different
;; number of arguments.
(defun byte-compile-arglist-warn (form macrop)
  (let* ((name (nth 1 form))
         (old (byte-compile-fdefinition name macrop)))
    (if (and old (not (eq old t)))
        (progn
          (and (eq 'macro (car-safe old))
               (eq 'lambda (car-safe (cdr-safe old)))
               (setq old (cdr old)))
          (let ((sig1 (byte-compile-arglist-signature
                       (pcase old
                         (`(lambda ,args . ,_) args)
                         (`(closure ,_ ,_ ,args . ,_) args)
                         ((pred byte-code-function-p) (aref old 0))
                         (t '(&rest def)))))
                (sig2 (byte-compile-arglist-signature (nth 2 form))))
            (unless (byte-compile-arglist-signatures-congruent-p sig1 sig2)
              (byte-compile-set-symbol-position name)
              (byte-compile-warn
               "%s %s used to take %s %s, now takes %s"
               (if (eq (car form) 'defun) "function" "macro")
               name
               (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 name byte-compile-unresolved-functions))
            nums sig min max)
        (when calls
          (when (and (symbolp name)
                     (eq (get name 'byte-optimizer)
                         'byte-compile-inline-expand))
            (byte-compile-warn "defsubst `%s' was used before it was defined"
                       name))
          (setq sig (byte-compile-arglist-signature (nth 2 form))
                nums (sort (copy-sequence (cdr calls)) (function <))
                min (car nums)
                max (car (nreverse nums)))
          (when (or (< min (car sig))
                    (and (cdr sig) (> max (cdr sig))))
            (byte-compile-set-symbol-position name)
            (byte-compile-warn
             "%s being defined to take %s%s, but was previously called with %s"
             name
             (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)))))))

(defvar byte-compile-cl-functions nil
  "List of functions defined in CL.")

;; Can't just add this to cl-load-hook, because that runs just before
;; the forms from cl.el get added to load-history.
(defun byte-compile-find-cl-functions ()
  (unless byte-compile-cl-functions
    (dolist (elt load-history)
      (and (byte-compile-cl-file-p (car elt))
           (dolist (e (cdr elt))
             ;; Includes the cl-foo functions that cl autoloads.
             (when (memq (car-safe e) '(autoload defun))
               (push (cdr e) byte-compile-cl-functions)))))))

(defun byte-compile-cl-warn (form)
  "Warn if FORM is a call of a function from the CL package."
  (let ((func (car-safe form)))
    (if (and byte-compile-cl-functions
             (memq func byte-compile-cl-functions)
             ;; Aliases which won't have been expanded at this point.
             ;; These aren't all aliases of subrs, so not trivial to
             ;; avoid hardwiring the list.
             (not (memq func
                        '(cl-block-wrapper cl-block-throw
                          multiple-value-call nth-value
                          copy-seq first second rest endp cl-member
                          ;; These are included in generated code
                          ;; that can't be called except at compile time
                          ;; or unless cl is loaded anyway.
                          cl-defsubst-expand cl-struct-setf-expander
                          ;; These would sometimes be warned about
                          ;; but such warnings are never useful,
                          ;; so don't warn about them.
                          macroexpand cl-macroexpand-all
                          cl-compiling-file))))
        (byte-compile-warn "function `%s' from cl package called at runtime"
                           func)))
  form)

(defun byte-compile-print-syms (str1 strn syms)
  (when syms
    (byte-compile-set-symbol-position (car syms) t))
  (cond ((and (cdr syms) (not noninteractive))
         (let* ((str strn)
                (L (length str))
                s)
           (while syms
             (setq s (symbol-name (pop syms))
                   L (+ L (length s) 2))
             (if (< L (1- fill-column))
                 (setq str (concat str " " s (and syms ",")))
               (setq str (concat str "\n    " s (and syms ","))
                     L (+ (length s) 4))))
           (byte-compile-warn "%s" str)))
        ((cdr syms)
         (byte-compile-warn "%s %s"
                            strn
                            (mapconcat #'symbol-name syms ", ")))

        (syms
         (byte-compile-warn str1 (car syms)))))

;; 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.
(defun byte-compile-warn-about-unresolved-functions ()
  (when (byte-compile-warning-enabled-p 'unresolved)
    (let ((byte-compile-current-form :end)
          (noruntime nil)
          (unresolved nil))
      ;; Separate the functions that will not be available at runtime
      ;; from the truly unresolved ones.
      (dolist (f byte-compile-unresolved-functions)
        (setq f (car f))
        (if (fboundp f) (push f noruntime) (push f unresolved)))
      ;; Complain about the no-run-time functions
      (byte-compile-print-syms
       "the function `%s' might not be defined at runtime."
       "the following functions might not be defined at runtime:"
       noruntime)
      ;; Complain about the unresolved functions
      (byte-compile-print-syms
       "the function `%s' is not known to be defined."
       "the following functions are not known to be defined:"
       unresolved)))
  nil)

\f
(defsubst byte-compile-const-symbol-p (symbol &optional any-value)
  "Non-nil if SYMBOL is constant.
If ANY-VALUE is nil, only return non-nil if the value of the symbol is the
symbol itself."
  (or (memq symbol '(nil t))
      (keywordp symbol)
      (if any-value
          (or (memq symbol byte-compile-const-variables)
              ;; FIXME: We should provide a less intrusive way to find out
              ;; if a variable is "constant".
              (and (boundp symbol)
                   (condition-case nil
                       (progn (set symbol (symbol-value symbol)) nil)
                     (setting-constant t)))))))

(defmacro byte-compile-constp (form)
  "Return non-nil if FORM is a constant."
  `(cond ((consp ,form) (eq (car ,form) 'quote))
         ((not (symbolp ,form)))
         ((byte-compile-const-symbol-p ,form))))

(defmacro byte-compile-close-variables (&rest body)
  (declare (debug t))
  (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-const-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)
                (byte-compile-dynamic byte-compile-dynamic)
                (byte-compile-dynamic-docstrings
                 byte-compile-dynamic-docstrings)
;;              (byte-compile-generate-emacs19-bytecodes
;;               byte-compile-generate-emacs19-bytecodes)
                (byte-compile-warnings byte-compile-warnings)
                )
              body)))

(defmacro displaying-byte-compile-warnings (&rest body)
  (declare (debug t))
  `(let* ((--displaying-byte-compile-warnings-fn (lambda () ,@body))
          (warning-series-started
           (and (markerp warning-series)
                (eq (marker-buffer warning-series)
                    (get-buffer byte-compile-log-buffer)))))
     (byte-compile-find-cl-functions)
     (if (or (eq warning-series 'byte-compile-warning-series)
             warning-series-started)
         ;; warning-series does come from compilation,
         ;; so don't bind it, but maybe do set it.
         (let (tem)
           ;; Log the file name.  Record position of that text.
           (setq tem (byte-compile-log-file))
           (unless warning-series-started
             (setq warning-series (or tem 'byte-compile-warning-series)))
           (if byte-compile-debug
               (funcall --displaying-byte-compile-warnings-fn)
             (condition-case error-info
                 (funcall --displaying-byte-compile-warnings-fn)
               (error (byte-compile-report-error error-info)))))
       ;; warning-series does not come from compilation, so bind it.
       (let ((warning-series
              ;; Log the file name.  Record position of that text.
              (or (byte-compile-log-file) 'byte-compile-warning-series)))
         (if byte-compile-debug
             (funcall --displaying-byte-compile-warnings-fn)
           (condition-case error-info
               (funcall --displaying-byte-compile-warnings-fn)
             (error (byte-compile-report-error error-info))))))))
\f
;;;###autoload
(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."
  (interactive "DByte force recompile (directory): ")
  (byte-recompile-directory directory nil t))

;; The `bytecomp-' prefix is applied to all local variables with
;; otherwise common names in this and similar functions for the sake
;; of the boundp test in byte-compile-variable-ref.
;; http://lists.gnu.org/archive/html/emacs-devel/2008-01/msg00237.html
;; http://lists.gnu.org/archive/html/bug-gnu-emacs/2008-02/msg00134.html
;; Note that similar considerations apply to command-line-1 in startup.el.
;;;###autoload
(defun byte-recompile-directory (bytecomp-directory &optional bytecomp-arg
                                                    bytecomp-force)
  "Recompile every `.el' file in BYTECOMP-DIRECTORY that needs recompilation.
This happens when a `.elc' file exists but is older than the `.el' file.
Files in subdirectories of BYTECOMP-DIRECTORY are processed also.

If the `.elc' file does not exist, normally this function *does not*
compile the corresponding `.el' file.  However, if the prefix argument
BYTECOMP-ARG is 0, that means do compile all those files.  A nonzero
BYTECOMP-ARG means ask the user, for each such `.el' file, whether to
compile it.  A nonzero BYTECOMP-ARG also means ask about each subdirectory
before scanning it.

If the third argument BYTECOMP-FORCE is non-nil, recompile every `.el' file
that already has a `.elc' file."
  (interactive "DByte recompile directory: \nP")
  (if bytecomp-arg
      (setq bytecomp-arg (prefix-numeric-value bytecomp-arg)))
  (if noninteractive
      nil
    (save-some-buffers)
    (force-mode-line-update))
  (with-current-buffer (get-buffer-create byte-compile-log-buffer)
    (setq default-directory (expand-file-name bytecomp-directory))
    ;; compilation-mode copies value of default-directory.
    (unless (eq major-mode 'compilation-mode)
      (compilation-mode))
    (let ((bytecomp-directories (list default-directory))
          (default-directory default-directory)
          (skip-count 0)
          (fail-count 0)
          (file-count 0)
          (dir-count 0)
          last-dir)
      (displaying-byte-compile-warnings
       (while bytecomp-directories
         (setq bytecomp-directory (car bytecomp-directories))
         (message "Checking %s..." bytecomp-directory)
         (let ((bytecomp-files (directory-files bytecomp-directory))
               bytecomp-source bytecomp-dest)
           (dolist (bytecomp-file bytecomp-files)
             (setq bytecomp-source
                   (expand-file-name bytecomp-file bytecomp-directory))
             (if (and (not (member bytecomp-file '("RCS" "CVS")))
                      (not (eq ?\. (aref bytecomp-file 0)))
                      (file-directory-p bytecomp-source)
                      (not (file-symlink-p bytecomp-source)))
                 ;; This file is a subdirectory.  Handle them differently.
                 (when (or (null bytecomp-arg)
                           (eq 0 bytecomp-arg)
                           (y-or-n-p (concat "Check " bytecomp-source "? ")))
                   (setq bytecomp-directories
                         (nconc bytecomp-directories (list bytecomp-source))))
               ;; It is an ordinary file.  Decide whether to compile it.
               (if (and (string-match emacs-lisp-file-regexp bytecomp-source)
                        (file-readable-p bytecomp-source)
                        (not (auto-save-file-name-p bytecomp-source))
                        (not (string-equal dir-locals-file
                                           (file-name-nondirectory
                                            bytecomp-source))))
                   (progn (let ((bytecomp-res (byte-recompile-file
                                               bytecomp-source
                                               bytecomp-force bytecomp-arg)))
                            (cond ((eq bytecomp-res 'no-byte-compile)
                                   (setq skip-count (1+ skip-count)))
                                  ((eq bytecomp-res t)
                                   (setq file-count (1+ file-count)))
                                  ((eq bytecomp-res nil)
                                   (setq fail-count (1+ fail-count)))))
                          (or noninteractive
                              (message "Checking %s..." bytecomp-directory))
                          (if (not (eq last-dir bytecomp-directory))
                              (setq last-dir bytecomp-directory
                                    dir-count (1+ dir-count)))
                          )))))
         (setq bytecomp-directories (cdr bytecomp-directories))))
      (message "Done (Total of %d file%s compiled%s%s%s)"
               file-count (if (= file-count 1) "" "s")
               (if (> fail-count 0) (format ", %d failed" fail-count) "")
               (if (> skip-count 0) (format ", %d skipped" skip-count) "")
               (if (> dir-count 1)
                   (format " in %d directories" dir-count) "")))))

(defvar no-byte-compile nil
  "Non-nil to prevent byte-compiling of Emacs Lisp code.
This is normally set in local file variables at the end of the elisp file:

\;; Local Variables:\n;; no-byte-compile: t\n;; End: ") ;Backslash for compile-main.
;;;###autoload(put 'no-byte-compile 'safe-local-variable 'booleanp)

(defun byte-recompile-file (bytecomp-filename &optional bytecomp-force bytecomp-arg load)
  "Recompile BYTECOMP-FILENAME file if it needs recompilation.
This happens when its `.elc' file is older than itself.

If the `.elc' file exists and is up-to-date, normally this
function *does not* compile BYTECOMP-FILENAME. However, if the
prefix argument BYTECOMP-FORCE is set, that means do compile
BYTECOMP-FILENAME even if the destination already exists and is
up-to-date.

If the `.elc' file does not exist, normally this function *does
not* compile BYTECOMP-FILENAME. If BYTECOMP-ARG is 0, that means
compile the file even if it has never been compiled before.
A nonzero BYTECOMP-ARG means ask the user.

If LOAD is set, `load' the file after compiling.

The value returned is the value returned by `byte-compile-file',
or 'no-byte-compile if the file did not need recompilation."
  (interactive
      (let ((bytecomp-file buffer-file-name)
         (bytecomp-file-name nil)
         (bytecomp-file-dir nil))
     (and bytecomp-file
          (eq (cdr (assq 'major-mode (buffer-local-variables)))
              'emacs-lisp-mode)
          (setq bytecomp-file-name (file-name-nondirectory bytecomp-file)
                bytecomp-file-dir (file-name-directory bytecomp-file)))
     (list (read-file-name (if current-prefix-arg
                               "Byte compile file: "
                             "Byte recompile file: ")
                           bytecomp-file-dir bytecomp-file-name nil)
           current-prefix-arg)))
  (let ((bytecomp-dest
         (byte-compile-dest-file bytecomp-filename))
        ;; Expand now so we get the current buffer's defaults
        (bytecomp-filename (expand-file-name bytecomp-filename)))
    (if (if (file-exists-p bytecomp-dest)
            ;; File was already compiled
            ;; Compile if forced to, or filename newer
            (or bytecomp-force
                (file-newer-than-file-p bytecomp-filename
                                         bytecomp-dest))
          (and bytecomp-arg
               (or (eq 0 bytecomp-arg)
                   (y-or-n-p (concat "Compile "
                                     bytecomp-filename "? ")))))
        (progn
          (if (and noninteractive (not byte-compile-verbose))
              (message "Compiling %s..." bytecomp-filename))
          (byte-compile-file bytecomp-filename load))
      (when load (load bytecomp-filename))
      'no-byte-compile)))

;;;###autoload
(defun byte-compile-file (bytecomp-filename &optional load)
  "Compile a file of Lisp code named BYTECOMP-FILENAME into a file of byte code.
The output file's name is generated by passing BYTECOMP-FILENAME to the
function `byte-compile-dest-file' (which see).
With prefix arg (noninteractively: 2nd arg), LOAD the file after compiling.
The value is non-nil if there were no errors, nil if errors."
;;  (interactive "fByte compile file: \nP")
  (interactive
   (let ((bytecomp-file buffer-file-name)
         (bytecomp-file-name nil)
         (bytecomp-file-dir nil))
     (and bytecomp-file
          (eq (cdr (assq 'major-mode (buffer-local-variables)))
              'emacs-lisp-mode)
          (setq bytecomp-file-name (file-name-nondirectory bytecomp-file)
                bytecomp-file-dir (file-name-directory bytecomp-file)))
     (list (read-file-name (if current-prefix-arg
                               "Byte compile and load file: "
                             "Byte compile file: ")
                           bytecomp-file-dir bytecomp-file-name nil)
           current-prefix-arg)))
  ;; Expand now so we get the current buffer's defaults
  (setq bytecomp-filename (expand-file-name bytecomp-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 bytecomp-filename))))
        (if (and b (buffer-modified-p b)
                 (y-or-n-p (format "Save buffer %s first? " (buffer-name b))))
            (with-current-buffer b (save-buffer)))))

  ;; Force logging of the file name for each file compiled.
  (setq byte-compile-last-logged-file nil)
  (let ((byte-compile-current-file bytecomp-filename)
        (byte-compile-current-group nil)
        (set-auto-coding-for-load t)
        target-file input-buffer output-buffer
        byte-compile-dest-file)
    (setq target-file (byte-compile-dest-file bytecomp-filename))
    (setq byte-compile-dest-file target-file)
    (with-current-buffer
        (setq input-buffer (get-buffer-create " *Compiler Input*"))
      (erase-buffer)
      (setq buffer-file-coding-system nil)
      ;; Always compile an Emacs Lisp file as multibyte
      ;; unless the file itself forces unibyte with -*-coding: raw-text;-*-
      (set-buffer-multibyte t)
      (insert-file-contents bytecomp-filename)
      ;; Mimic the way after-insert-file-set-coding can make the
      ;; buffer unibyte when visiting this file.
      (when (or (eq last-coding-system-used 'no-conversion)
                (eq (coding-system-type last-coding-system-used) 5))
        ;; For coding systems no-conversion and raw-text...,
        ;; edit the buffer as unibyte.
        (set-buffer-multibyte nil))
      ;; Run hooks including the uncompression hook.
      ;; If they change the file name, then change it for the output also.
      (letf ((buffer-file-name bytecomp-filename)
             ((default-value 'major-mode) 'emacs-lisp-mode)
             ;; Ignore unsafe local variables.
             ;; We only care about a few of them for our purposes.
             (enable-local-variables :safe)
             (enable-local-eval nil))
        ;; Arg of t means don't alter enable-local-variables.
        (normal-mode t)
        (setq bytecomp-filename buffer-file-name))
      ;; Set the default directory, in case an eval-when-compile uses it.
      (setq default-directory (file-name-directory bytecomp-filename)))
    ;; Check if the file's local variables explicitly specify not to
    ;; compile this file.
    (if (with-current-buffer input-buffer no-byte-compile)
        (progn
          ;; (message "%s not compiled because of `no-byte-compile: %s'"
          ;;       (file-relative-name bytecomp-filename)
          ;;       (with-current-buffer input-buffer no-byte-compile))
          (when (file-exists-p target-file)
            (message "%s deleted because of `no-byte-compile: %s'"
                     (file-relative-name target-file)
                     (buffer-local-value 'no-byte-compile input-buffer))
            (condition-case nil (delete-file target-file) (error nil)))
          ;; We successfully didn't compile this file.
          'no-byte-compile)
      (when byte-compile-verbose
        (message "Compiling %s..." bytecomp-filename))
      (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.
      (setq output-buffer
            (save-current-buffer
              (byte-compile-from-buffer input-buffer bytecomp-filename)))
      (if byte-compiler-error-flag
          nil
        (when byte-compile-verbose
          (message "Compiling %s...done" bytecomp-filename))
        (kill-buffer input-buffer)
        (with-current-buffer output-buffer
          (goto-char (point-max))
          (insert "\n")                 ; aaah, unix.
            (if (file-writable-p target-file)
                ;; We must disable any code conversion here.
                (let* ((coding-system-for-write 'no-conversion)
                       ;; Write to a tempfile so that if another Emacs
                       ;; process is trying to load target-file (eg in a
                       ;; parallel bootstrap), it does not risk getting a
                       ;; half-finished file.  (Bug#4196)
                       (tempfile (make-temp-name target-file))
                       (kill-emacs-hook
                        (cons (lambda () (ignore-errors (delete-file tempfile)))
                              kill-emacs-hook)))
                  (if (memq system-type '(ms-dos 'windows-nt))
                      (setq buffer-file-type t))
                  (write-region (point-min) (point-max) tempfile nil 1)
                  ;; This has the intentional side effect that any
                  ;; hard-links to target-file continue to
                  ;; point to the old file (this makes it possible
                  ;; for installed files to share disk space with
                  ;; the build tree, without causing problems when
                  ;; emacs-lisp files in the build tree are
                  ;; recompiled).  Previously this was accomplished by
                  ;; deleting target-file before writing it.
                  (rename-file tempfile target-file t)
                  (message "Wrote %s" 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")
                            target-file)))
          (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? "
                                       bytecomp-filename))))
            (save-excursion
              (display-call-tree bytecomp-filename)))
        (if load
            (load target-file))
        t))))

;;; compiling a single function
;;;###autoload
(defun compile-defun (&optional arg)
  "Compile and evaluate the current top-level form.
Print the result in the echo area.
With argument ARG, 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-current-buffer (current-buffer))
           (byte-compile-read-position (point))
           (byte-compile-last-position byte-compile-read-position)
           (byte-compile-last-warned-form 'nothing)
           (value (eval
                   (let ((read-with-symbol-positions (current-buffer))
                         (read-symbol-positions-list nil))
                     (displaying-byte-compile-warnings
                      (byte-compile-sexp (read (current-buffer))))))))
      (cond (arg
             (message "Compiling from buffer... done.")
             (prin1 value (current-buffer))
             (insert "\n"))
            ((message "%s" (prin1-to-string value)))))))


(defun byte-compile-from-buffer (bytecomp-inbuffer &optional bytecomp-filename)
  ;; Filename is used for the loading-into-Emacs-18 error message.
  (let (bytecomp-outbuffer
        (byte-compile-current-buffer bytecomp-inbuffer)
        (byte-compile-read-position nil)
        (byte-compile-last-position nil)
        ;; Prevent truncation of flonums and lists as we read and print them
        (float-output-format nil)
        (case-fold-search nil)
        (print-length nil)
        (print-level nil)
        ;; Prevent edebug from interfering when we compile
        ;; and put the output into a file.
;;      (edebug-all-defs nil)
;;      (edebug-all-forms nil)
        ;; 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 allows us to get the positions of symbols read; it's
        ;; new in Emacs 22.1.
        (read-with-symbol-positions bytecomp-inbuffer)
        (read-symbol-positions-list nil)
        ;;        #### This is bound in b-c-close-variables.
        ;;        (byte-compile-warnings byte-compile-warnings)
        )
    (byte-compile-close-variables
     (with-current-buffer
         (setq bytecomp-outbuffer (get-buffer-create " *Compiler Output*"))
       (set-buffer-multibyte t)
       (erase-buffer)
       ;;        (emacs-lisp-mode)
       (setq case-fold-search nil))
     (displaying-byte-compile-warnings
      (with-current-buffer bytecomp-inbuffer
        (and bytecomp-filename
             (byte-compile-insert-header bytecomp-filename bytecomp-outbuffer))
        (goto-char (point-min))
        ;; Should we always do this?  When calling multiple files, it
        ;; would be useful to delay this warning until all have been
        ;; compiled.  A: Yes!  b-c-u-f might contain dross from a
        ;; previous byte-compile.
        (setq byte-compile-unresolved-functions nil)

        ;; Compile the forms from the input buffer.
        (while (progn
                 (while (progn (skip-chars-forward " \t\n\^l")
                               (looking-at ";"))
                   (forward-line 1))
                 (not (eobp)))
          (setq byte-compile-read-position (point)
                byte-compile-last-position byte-compile-read-position)
          (let* ((old-style-backquotes nil)
                 (form (read bytecomp-inbuffer)))
            ;; Warn about the use of old-style backquotes.
            (when old-style-backquotes
              (byte-compile-warn "!! The file uses old-style backquotes !!
This functionality has been obsolete for more than 10 years already
and will be removed soon.  See (elisp)Backquote in the manual."))
            (byte-compile-toplevel-file-form form)))
        ;; Compile pending forms at end of file.
        (byte-compile-flush-pending)
        ;; Make warnings about unresolved functions
        ;; give the end of the file as their position.
        (setq byte-compile-last-position (point-max))
        (byte-compile-warn-about-unresolved-functions))
      ;; Fix up the header at the front of the output
      ;; if the buffer contains multibyte characters.
      (and bytecomp-filename
           (with-current-buffer bytecomp-outbuffer
             (byte-compile-fix-header bytecomp-filename)))))
    bytecomp-outbuffer))

(defun byte-compile-fix-header (filename)
  "If the current buffer has any multibyte characters, insert a version test."
  (when (< (point-max) (position-bytes (point-max)))
    (goto-char (point-min))
    ;; Find the comment that describes the version condition.
    (search-forward "\n;;; This file uses")
    (narrow-to-region (line-beginning-position) (point-max))
    ;; Find the first line of ballast semicolons.
    (search-forward ";;;;;;;;;;")
    (beginning-of-line)
    (narrow-to-region (point-min) (point))
    (let ((old-header-end (point))
          (minimum-version "23")
          delta)
      (delete-region (point-min) (point-max))
      (insert
       ";;; This file contains utf-8 non-ASCII characters,\n"
       ";;; and so cannot be loaded into Emacs 22 or earlier.\n"
       ;; Have to check if emacs-version is bound so that this works
       ;; in files loaded early in loadup.el.
       "(and (boundp 'emacs-version)\n"
       ;; If there is a name at the end of emacs-version,
       ;; don't try to check the version number.
       "     (< (aref emacs-version (1- (length emacs-version))) ?A)\n"
       (format "     (string-lessp emacs-version \"%s\")\n" minimum-version)
       "     (error \"`"
       ;; prin1-to-string is used to quote backslashes.
       (substring (prin1-to-string (file-name-nondirectory filename))
                  1 -1)
       (format "' was compiled for Emacs %s or later\"))\n\n"
               minimum-version))
      ;; Now compensate for any change in size, to make sure all
      ;; positions in the file remain valid.
      (setq delta (- (point-max) old-header-end))
      (goto-char (point-max))
      (widen)
      (delete-char delta))))

(defun byte-compile-insert-header (filename outbuffer)
  "Insert a header at the start of OUTBUFFER.
Call from the source buffer."
  (let ((dynamic-docstrings byte-compile-dynamic-docstrings)
        (dynamic byte-compile-dynamic)
        (optimize byte-optimize))
    (with-current-buffer outbuffer
      (goto-char (point-min))
      ;; The magic number of .elc files is ";ELC", or 0x3B454C43.  After
      ;; that is the file-format version number (18, 19, 20, or 23) as a
      ;; byte, followed by some nulls.  The primary motivation for doing
      ;; this is to get some binary characters up in the first line of
      ;; the file so that `diff' will simply say "Binary files differ"
      ;; instead of actually doing a diff of two .elc files.  An extra
      ;; benefit is that you can add this to /etc/magic:
      ;; 0      string          ;ELC            GNU Emacs Lisp compiled file,
      ;; >4     byte            x               version %d
      (insert
       ";ELC" 23 "\000\000\000\n"
       ";;; Compiled by "
       (or (and (boundp 'user-mail-address) user-mail-address)
           (concat (user-login-name) "@" (system-name)))
       " on " (current-time-string) "\n"
       ";;; from file " filename "\n"
       ";;; in Emacs version " emacs-version "\n"
       ";;; with"
       (cond
        ((eq optimize 'source) " source-level optimization only")
        ((eq optimize 'byte) " byte-level optimization only")
        (optimize " all optimizations")
        (t "out optimization"))
       ".\n"
       (if dynamic ";;; Function definitions are lazy-loaded.\n"
         "")
       "\n;;; This file uses "
       (if dynamic-docstrings
           "dynamic docstrings, first added in Emacs 19.29"
         "opcodes that do not exist in Emacs 18")
       ".\n\n"
       ;; Note that byte-compile-fix-header may change this.
       ";;; This file does not contain utf-8 non-ASCII characters,\n"
       ";;; and so can be loaded in Emacs versions earlier than 23.\n\n"
       ;; Insert semicolons as ballast, so that byte-compile-fix-header
       ;; can delete them so as to keep the buffer positions
       ;; constant for the actual compiled code.
       ";;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;\n"
       ";;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;\n\n"))))

;; Dynamically bound in byte-compile-from-buffer.
;; NB also used in cl.el and cl-macs.el.
(defvar bytecomp-outbuffer)

(defun byte-compile-output-file-form (form)
  ;; writes the given form to the output buffer, being careful of docstrings
  ;; in defun, defmacro, defvar, defvaralias, defconst, autoload and
  ;; custom-declare-variable because make-docfile is so amazingly stupid.
  ;; defalias calls are output directly by byte-compile-file-form-defmumble;
  ;; it does not pay to first build the defalias in defmumble and then parse
  ;; it here.
  (if (and (memq (car-safe form) '(defun defmacro defvar defvaralias defconst
                                    autoload custom-declare-variable))
           (stringp (nth 3 form)))
      (byte-compile-output-docform nil nil '("\n(" 3 ")") form nil
                                   (memq (car form)
                                         '(defvaralias autoload
                                           custom-declare-variable)))
    (let ((print-escape-newlines t)
          (print-length nil)
          (print-level nil)
          (print-quoted t)
          (print-gensym t)
          (print-circle              ; handle circular data structures
           (not byte-compile-disable-print-circle)))
      (princ "\n" bytecomp-outbuffer)
      (prin1 form bytecomp-outbuffer)
      nil)))

(defvar print-gensym-alist)             ;Used before print-circle existed.

(defun byte-compile-output-docform (preface name info form specindex quoted)
  "Print a form with a doc string.  INFO is (prefix doc-index postfix).
If PREFACE and NAME are non-nil, print them too,
before INFO and the FORM but after the doc string itself.
If SPECINDEX is non-nil, it is the index in FORM
of the function bytecode string.  In that case,
we output that argument and the following argument
\(the constants vector) together, for lazy loading.
QUOTED says that we have to put a quote before the
list that represents a doc string reference.
`defvaralias', `autoload' and `custom-declare-variable' need that."
  ;; We need to examine byte-compile-dynamic-docstrings
  ;; in the input buffer (now current), not in the output buffer.
  (let ((dynamic-docstrings byte-compile-dynamic-docstrings))
    (with-current-buffer bytecomp-outbuffer
      (let (position)

        ;; Insert the doc string, and make it a comment with #@LENGTH.
        (and (>= (nth 1 info) 0)
             dynamic-docstrings
             (progn
               ;; Make the doc string start at beginning of line
               ;; for make-docfile's sake.
               (insert "\n")
               (setq position
                     (byte-compile-output-as-comment
                      (nth (nth 1 info) form) nil))
               (setq position (- (position-bytes position) (point-min) -1))
               ;; If the doc string starts with * (a user variable),
               ;; negate POSITION.
               (if (and (stringp (nth (nth 1 info) form))
                        (> (length (nth (nth 1 info) form)) 0)
                        (eq (aref (nth (nth 1 info) form) 0) ?*))
                   (setq position (- position)))))

        (if preface
            (progn
              (insert preface)
              (prin1 name bytecomp-outbuffer)))
        (insert (car info))
        (let ((print-escape-newlines t)
              (print-quoted t)
              ;; For compatibility with code before print-circle,
              ;; use a cons cell to say that we want
              ;; print-gensym-alist not to be cleared
              ;; between calls to print functions.
              (print-gensym '(t))
              (print-circle             ; handle circular data structures
               (not byte-compile-disable-print-circle))
              print-gensym-alist     ; was used before print-circle existed.
              (print-continuous-numbering t)
              print-number-table
              (index 0))
          (prin1 (car form) bytecomp-outbuffer)
          (while (setq form (cdr form))
            (setq index (1+ index))
            (insert " ")
            (cond ((and (numberp specindex) (= index specindex)
                        ;; Don't handle the definition dynamically
                        ;; if it refers (or might refer)
                        ;; to objects already output
                        ;; (for instance, gensyms in the arg list).
                        (let (non-nil)
                          (when (hash-table-p print-number-table)
                            (maphash (lambda (k v) (if v (setq non-nil t)))
                                     print-number-table))
                          (not non-nil)))
                   ;; Output the byte code and constants specially
                   ;; for lazy dynamic loading.
                   (let ((position
                          (byte-compile-output-as-comment
                           (cons (car form) (nth 1 form))
                           t)))
                     (setq position (- (position-bytes position) (point-min) -1))
                     (princ (format "(#$ . %d) nil" position) bytecomp-outbuffer)
                     (setq form (cdr form))
                     (setq index (1+ index))))
                  ((= index (nth 1 info))
                   (if position
                       (princ (format (if quoted "'(#$ . %d)"  "(#$ . %d)")
                                      position)
                              bytecomp-outbuffer)
                     (let ((print-escape-newlines nil))
                       (goto-char (prog1 (1+ (point))
                                    (prin1 (car form) bytecomp-outbuffer)))
                       (insert "\\\n")
                       (goto-char (point-max)))))
                  (t
                   (prin1 (car form) bytecomp-outbuffer)))))
        (insert (nth 2 info)))))
  nil)

(defun byte-compile-keep-pending (form &optional bytecomp-handler)
  (if (memq byte-optimize '(t source))
      (setq form (byte-optimize-form form t)))
  (if bytecomp-handler
      (let ((for-effect t))
        ;; To avoid consing up monstrously large forms at load time, we split
        ;; the output regularly.
        (and (memq (car-safe form) '(fset defalias))
             (nthcdr 300 byte-compile-output)
             (byte-compile-flush-pending))
        (funcall bytecomp-handler form)
        (if for-effect
            (byte-compile-discard)))
    (byte-compile-form form t))
  nil)

(defun byte-compile-flush-pending ()
  (if byte-compile-output
      (let ((form (byte-compile-out-toplevel t 'file)))
        (cond ((eq (car-safe form) 'progn)
               (mapc 'byte-compile-output-file-form (cdr form)))
              (form
               (byte-compile-output-file-form form)))
        (setq byte-compile-constants nil
              byte-compile-variables nil
              byte-compile-depth 0
              byte-compile-maxdepth 0
              byte-compile-output nil))))

;; byte-hunk-handlers cannot call this!
(defun byte-compile-toplevel-file-form (form)
  (let ((byte-compile-current-form nil))        ; close over this for warnings.
    (setq form (macroexpand-all form byte-compile-macro-environment))
    (if lexical-binding
        (setq form (cconv-closure-convert form)))
    (byte-compile-file-form form)))

;; byte-hunk-handlers can call this.
(defun byte-compile-file-form (form)
  (let (bytecomp-handler)
    (cond ((and (consp form)
                (symbolp (car form))
                (setq bytecomp-handler (get (car form) 'byte-hunk-handler)))
           (cond ((setq form (funcall bytecomp-handler form))
                  (byte-compile-flush-pending)
                  (byte-compile-output-file-form form))))
          (t
           (byte-compile-keep-pending form)))))

;; Functions and variables with doc strings must be output separately,
;; so make-docfile can recognise them.  Most other things can be output
;; as byte-code.

(put 'autoload 'byte-hunk-handler 'byte-compile-file-form-autoload)
(defun byte-compile-file-form-autoload (form)
  (and (let ((form form))
         (while (if (setq form (cdr form)) (byte-compile-constp (car form))))
         (null form))                   ;Constants only
       (eval (nth 5 form))              ;Macro
       (eval form))                     ;Define the autoload.
  ;; Avoid undefined function warnings for the autoload.
  (when (and (consp (nth 1 form))
           (eq (car (nth 1 form)) 'quote)
           (consp (cdr (nth 1 form)))
           (symbolp (nth 1 (nth 1 form))))
    (push (cons (nth 1 (nth 1 form))
                (cons 'autoload (cdr (cdr form))))
          byte-compile-function-environment)
    ;; If an autoload occurs _before_ the first call to a function,
    ;; byte-compile-callargs-warn does not add an entry to
    ;; byte-compile-unresolved-functions.  Here we mimic the logic
    ;; of byte-compile-callargs-warn so as not to warn if the
    ;; autoload comes _after_ the function call.
    ;; Alternatively, similar logic could go in
    ;; byte-compile-warn-about-unresolved-functions.
    (or (memq (nth 1 (nth 1 form)) byte-compile-noruntime-functions)
        (setq byte-compile-unresolved-functions
              (delq (assq (nth 1 (nth 1 form))
                          byte-compile-unresolved-functions)
                    byte-compile-unresolved-functions))))
  (if (stringp (nth 3 form))
      form
    ;; No doc string, so we can compile this as a normal form.
    (byte-compile-keep-pending form 'byte-compile-normal-call)))

(put 'defvar   'byte-hunk-handler 'byte-compile-file-form-defvar)
(put 'defconst 'byte-hunk-handler 'byte-compile-file-form-defvar)
(defun byte-compile-file-form-defvar (form)
  (if (null (nth 3 form))
      ;; Since there is no doc string, we can compile this as a normal form,
      ;; and not do a file-boundary.
      (byte-compile-keep-pending form)
    (when (and (symbolp (nth 1 form))
               (not (string-match "[-*/:$]" (symbol-name (nth 1 form))))
               (byte-compile-warning-enabled-p 'lexical))
      (byte-compile-warn "global/dynamic var `%s' lacks a prefix"
                         (nth 1 form)))
    (push (nth 1 form) byte-compile-bound-variables)
    (if (eq (car form) 'defconst)
        (push (nth 1 form) byte-compile-const-variables))
    (cond ((consp (nth 2 form))
           (setq form (copy-sequence form))
           (setcar (cdr (cdr form))
                   (byte-compile-top-level (nth 2 form) nil 'file))))
    form))

(put 'define-abbrev-table 'byte-hunk-handler 'byte-compile-file-form-define-abbrev-table)
(defun byte-compile-file-form-define-abbrev-table (form)
  (if (eq 'quote (car-safe (car-safe (cdr form))))
      (push (car-safe (cdr (cadr form))) byte-compile-bound-variables))
  (byte-compile-keep-pending form))

(put 'custom-declare-variable 'byte-hunk-handler
     'byte-compile-file-form-custom-declare-variable)
(defun byte-compile-file-form-custom-declare-variable (form)
  (when (byte-compile-warning-enabled-p 'callargs)
    (byte-compile-nogroup-warn form))
  (push (nth 1 (nth 1 form)) byte-compile-bound-variables)
  ;; Don't compile the expression because it may be displayed to the user.
  ;; (when (eq (car-safe (nth 2 form)) 'quote)
  ;;   ;; (nth 2 form) is meant to evaluate to an expression, so if we have the
  ;;   ;; final value already, we can byte-compile it.
  ;;   (setcar (cdr (nth 2 form))
  ;;           (byte-compile-top-level (cadr (nth 2 form)) nil 'file)))
  (let ((tail (nthcdr 4 form)))
    (while tail
      (unless (keywordp (car tail))      ;No point optimizing keywords.
        ;; Compile the keyword arguments.
        (setcar tail (byte-compile-top-level (car tail) nil 'file)))
      (setq tail (cdr tail))))
  form)

(put 'require 'byte-hunk-handler 'byte-compile-file-form-require)
(defun byte-compile-file-form-require (form)
  (let ((args (mapcar 'eval (cdr form)))
        (hist-orig load-history)
        hist-new)
    (apply 'require args)
    (when (byte-compile-warning-enabled-p 'cl-functions)
      ;; Detect (require 'cl) in a way that works even if cl is already loaded.
      (if (member (car args) '("cl" cl))
          (progn
            (byte-compile-warn "cl package required at runtime")
            (byte-compile-disable-warning 'cl-functions))
        ;; We may have required something that causes cl to be loaded, eg
        ;; the uncompiled version of a file that requires cl when compiling.
        (setq hist-new load-history)
        (while (and (not byte-compile-cl-functions)
                    hist-new (not (eq hist-new hist-orig)))
          (and (byte-compile-cl-file-p (car (pop hist-new)))
               (byte-compile-find-cl-functions))))))
  (byte-compile-keep-pending form 'byte-compile-normal-call))

(put 'progn 'byte-hunk-handler 'byte-compile-file-form-progn)
(put 'prog1 'byte-hunk-handler 'byte-compile-file-form-progn)
(put 'prog2 'byte-hunk-handler 'byte-compile-file-form-progn)
(defun byte-compile-file-form-progn (form)
  (mapc 'byte-compile-file-form (cdr form))
  ;; Return nil so the forms are not output twice.
  nil)

(put 'with-no-warnings 'byte-hunk-handler
     'byte-compile-file-form-with-no-warnings)
(defun byte-compile-file-form-with-no-warnings (form)
  ;; cf byte-compile-file-form-progn.
  (let (byte-compile-warnings)
    (mapc 'byte-compile-file-form (cdr form))
    nil))

;; This handler is not necessary, but it makes the output from dont-compile
;; and similar macros cleaner.
(put 'eval 'byte-hunk-handler 'byte-compile-file-form-eval)
(defun byte-compile-file-form-eval (form)
  (if (eq (car-safe (nth 1 form)) 'quote)
      (nth 1 (nth 1 form))
    (byte-compile-keep-pending form)))

(put 'defun 'byte-hunk-handler 'byte-compile-file-form-defun)
(defun byte-compile-file-form-defun (form)
  (byte-compile-file-form-defmumble form nil))

(put 'defmacro 'byte-hunk-handler 'byte-compile-file-form-defmacro)
(defun byte-compile-file-form-defmacro (form)
  (byte-compile-file-form-defmumble form t))

(defun byte-compile-defmacro-declaration (form)
  "Generate code for declarations in macro definitions.
Remove declarations from the body of the macro definition
by side-effects."
  (let ((tail (nthcdr 2 form))
        (res '()))
    (when (stringp (car (cdr tail)))
      (setq tail (cdr tail)))
    (while (and (consp (car (cdr tail)))
                (eq (car (car (cdr tail))) 'declare))
      (let ((declaration (car (cdr tail))))
        (setcdr tail (cdr (cdr tail)))
        (push `(if macro-declaration-function
                   (funcall macro-declaration-function
                            ',(car (cdr form)) ',declaration))
              res)))
    res))

(defun byte-compile-file-form-defmumble (form macrop)
  (let* ((bytecomp-name (car (cdr form)))
         (bytecomp-this-kind (if macrop 'byte-compile-macro-environment
                      'byte-compile-function-environment))
         (bytecomp-that-kind (if macrop 'byte-compile-function-environment
                      'byte-compile-macro-environment))
         (bytecomp-this-one (assq bytecomp-name
                                  (symbol-value bytecomp-this-kind)))
         (bytecomp-that-one (assq bytecomp-name
                                  (symbol-value bytecomp-that-kind)))
         (byte-compile-free-references nil)
         (byte-compile-free-assignments nil))
    (byte-compile-set-symbol-position bytecomp-name)
    ;; When a function or macro is defined, add it to the call tree so that
    ;; we can tell when functions are not used.
    (if byte-compile-generate-call-tree
        (or (assq bytecomp-name byte-compile-call-tree)
            (setq byte-compile-call-tree
                  (cons (list bytecomp-name nil nil) byte-compile-call-tree))))

    (setq byte-compile-current-form bytecomp-name) ; for warnings
    (if (byte-compile-warning-enabled-p 'redefine)
        (byte-compile-arglist-warn form macrop))
    (if byte-compile-verbose
        ;; bytecomp-filename is from byte-compile-from-buffer.
        (message "Compiling %s... (%s)" (or bytecomp-filename "") (nth 1 form)))
    (cond (bytecomp-that-one
           (if (and (byte-compile-warning-enabled-p 'redefine)
                    ;; don't warn when compiling the stubs in byte-run...
                    (not (assq (nth 1 form)
                               byte-compile-initial-macro-environment)))
               (byte-compile-warn
                 "`%s' defined multiple times, as both function and macro"
                 (nth 1 form)))
           (setcdr bytecomp-that-one nil))
          (bytecomp-this-one
           (when (and (byte-compile-warning-enabled-p 'redefine)
                    ;; hack: don't warn when compiling the magic internal
                    ;; byte-compiler macros in byte-run.el...
                    (not (assq (nth 1 form)
                               byte-compile-initial-macro-environment)))
             (byte-compile-warn "%s `%s' defined multiple times in this file"
                                (if macrop "macro" "function")
                                (nth 1 form))))
          ((and (fboundp bytecomp-name)
                (eq (car-safe (symbol-function bytecomp-name))
                    (if macrop 'lambda 'macro)))
           (when (byte-compile-warning-enabled-p 'redefine)
             (byte-compile-warn "%s `%s' being redefined as a %s"
                                (if macrop "function" "macro")
                                (nth 1 form)
                                (if macrop "macro" "function")))
           ;; shadow existing definition
           (set bytecomp-this-kind
                (cons (cons bytecomp-name nil)
                      (symbol-value bytecomp-this-kind))))
          )
    (let ((body (nthcdr 3 form)))
      (when (and (stringp (car body))
                 (symbolp (car-safe (cdr-safe body)))
                 (car-safe (cdr-safe body))
                 (stringp (car-safe (cdr-safe (cdr-safe body)))))
        (byte-compile-set-symbol-position (nth 1 form))
        (byte-compile-warn "probable `\"' without `\\' in doc string of %s"
                           (nth 1 form))))

    ;; Generate code for declarations in macro definitions.
    ;; Remove declarations from the body of the macro definition.
    (when macrop
      (dolist (decl (byte-compile-defmacro-declaration form))
        (prin1 decl bytecomp-outbuffer)))

    (let* ((new-one (byte-compile-lambda (nthcdr 2 form) t))
           (code (byte-compile-byte-code-maker new-one)))
      (if bytecomp-this-one
          (setcdr bytecomp-this-one new-one)
        (set bytecomp-this-kind
             (cons (cons bytecomp-name new-one)
                   (symbol-value bytecomp-this-kind))))
      (if (and (stringp (nth 3 form))
               (eq 'quote (car-safe code))
               (eq 'lambda (car-safe (nth 1 code))))
          (cons (car form)
                (cons bytecomp-name (cdr (nth 1 code))))
        (byte-compile-flush-pending)
        (if (not (stringp (nth 3 form)))
            ;; No doc string.  Provide -1 as the "doc string index"
            ;; so that no element will be treated as a doc string.
            (byte-compile-output-docform
             "\n(defalias '"
             bytecomp-name
             (cond ((atom code)
                    (if macrop '(" '(macro . #[" -1 "])") '(" #[" -1 "]")))
                   ((eq (car code) 'quote)
                    (setq code new-one)
                    (if macrop '(" '(macro " -1 ")") '(" '(" -1 ")")))
                   ((if macrop '(" (cons 'macro (" -1 "))") '(" (" -1 ")"))))
             (append code nil)
             (and (atom code) byte-compile-dynamic
                  1)
             nil)
          ;; Output the form by hand, that's much simpler than having
          ;; b-c-output-file-form analyze the defalias.
          (byte-compile-output-docform
           "\n(defalias '"
           bytecomp-name
           (cond ((atom code)
                  (if macrop '(" '(macro . #[" 4 "])") '(" #[" 4 "]")))
                 ((eq (car code) 'quote)
                  (setq code new-one)
                  (if macrop '(" '(macro " 2 ")") '(" '(" 2 ")")))
                 ((if macrop '(" (cons 'macro (" 5 "))") '(" (" 5 ")"))))
           (append code nil)
           (and (atom code) byte-compile-dynamic
                1)
           nil))
        (princ ")" bytecomp-outbuffer)
        nil))))

;; Print Lisp object EXP in the output file, inside a comment,
;; and return the file position it will have.
;; If QUOTED is non-nil, print with quoting; otherwise, print without quoting.
(defun byte-compile-output-as-comment (exp quoted)
  (let ((position (point)))
    (with-current-buffer bytecomp-outbuffer

      ;; Insert EXP, and make it a comment with #@LENGTH.
      (insert " ")
      (if quoted
          (prin1 exp bytecomp-outbuffer)
        (princ exp bytecomp-outbuffer))
      (goto-char position)
      ;; Quote certain special characters as needed.
      ;; get_doc_string in doc.c does the unquoting.
      (while (search-forward "\^A" nil t)
        (replace-match "\^A\^A" t t))
      (goto-char position)
      (while (search-forward "\000" nil t)
        (replace-match "\^A0" t t))
      (goto-char position)
      (while (search-forward "\037" nil t)
        (replace-match "\^A_" t t))
      (goto-char (point-max))
      (insert "\037")
      (goto-char position)
      (insert "#@" (format "%d" (- (position-bytes (point-max))
                                   (position-bytes position))))

      ;; Save the file position of the object.
      ;; Note we should add 1 to skip the space
      ;; that we inserted before the actual doc string,
      ;; and subtract 1 to convert from an 1-origin Emacs position
      ;; to a file position; they cancel.
      (setq position (point))
      (goto-char (point-max)))
    position))


\f
;;;###autoload
(defun byte-compile (form)
  "If FORM is a symbol, byte-compile its function definition.
If FORM is a lambda or a macro, byte-compile it as a function."
  (displaying-byte-compile-warnings
   (byte-compile-close-variables
    (let* ((fun (if (symbolp form)
                    (and (fboundp form) (symbol-function form))
                  form))
           (macro (eq (car-safe fun) 'macro)))
      (if macro
          (setq fun (cdr fun)))
      (cond ((eq (car-safe fun) 'lambda)
             ;; Expand macros.
             (setq fun
                   (macroexpand-all fun
                                    byte-compile-initial-macro-environment))
             (if lexical-binding
                 (setq fun (cconv-closure-convert fun)))
             ;; Get rid of the `function' quote added by the `lambda' macro.
             (if (eq (car-safe fun) 'function) (setq fun (cadr fun)))
             (setq fun (if macro
                           (cons 'macro (byte-compile-lambda fun))
                         (byte-compile-lambda fun)))
             (if (symbolp form)
                 (defalias form fun)
               fun)))))))

(defun byte-compile-sexp (sexp)
  "Compile and return SEXP."
  (displaying-byte-compile-warnings
   (byte-compile-close-variables
    (byte-compile-top-level sexp))))

;; Given a function made by byte-compile-lambda, make a form which produces it.
(defun byte-compile-byte-code-maker (fun)
  (cond
   ;; ## atom is faster than compiled-func-p.
   ((atom fun)                          ; compiled function.
    ;; generate-emacs19-bytecodes must be on, otherwise byte-compile-lambda
    ;; would have produced a lambda.
    fun)
   ;; b-c-lambda didn't produce a compiled-function, so it's either a trivial
   ;; function, or this is Emacs 18, or generate-emacs19-bytecodes is off.
   ((let (tmp)
      ;; FIXME: can this happen?
      (if (and (setq tmp (assq 'byte-code (cdr-safe (cdr fun))))
               (null (cdr (memq tmp fun))))
          ;; Generate a make-byte-code call.
          (let* ((interactive (assq 'interactive (cdr (cdr fun)))))
            (nconc (list 'make-byte-code
                         (list 'quote (nth 1 fun)) ;arglist
                         (nth 1 tmp)    ;bytes
                         (nth 2 tmp)    ;consts
                         (nth 3 tmp))   ;depth
                   (cond ((stringp (nth 2 fun))
                          (list (nth 2 fun))) ;doc
                         (interactive
                          (list nil)))
                   (cond (interactive
                          (list (if (or (null (nth 1 interactive))
                                        (stringp (nth 1 interactive)))
                                    (nth 1 interactive)
                                  ;; Interactive spec is a list or a variable
                                  ;; (if it is correct).
                                  (list 'quote (nth 1 interactive))))))))
        ;; a non-compiled function (probably trivial)
        (list 'quote fun))))))

;; Turn a function into an ordinary lambda.  Needed for v18 files.
(defun byte-compile-byte-code-unmake (function) ;FIXME: what is it?
  (if (consp function)
      function;;It already is a lambda.
    (setq function (append function nil)) ; turn it into a list
    (nconc (list 'lambda (nth 0 function))
           (and (nth 4 function) (list (nth 4 function)))
           (if (nthcdr 5 function)
               (list (cons 'interactive (if (nth 5 function)
                                            (nthcdr 5 function)))))
           (list (list 'byte-code
                       (nth 1 function) (nth 2 function)
                       (nth 3 function))))))


(defun byte-compile-check-lambda-list (list)
  "Check lambda-list LIST for errors."
  (let (vars)
    (while list
      (let ((arg (car list)))
        (when (symbolp arg)
          (byte-compile-set-symbol-position arg))
        (cond ((or (not (symbolp arg))
                   (byte-compile-const-symbol-p arg t))
               (error "Invalid lambda variable %s" arg))
              ((eq arg '&rest)
               (unless (cdr list)
                 (error "&rest without variable name"))
               (when (cddr list)
                 (error "Garbage following &rest VAR in lambda-list")))
              ((eq arg '&optional)
               (unless (cdr list)
                 (error "Variable name missing after &optional")))
              ((memq arg vars)
               (byte-compile-warn "repeated variable %s in lambda-list" arg))
              (t
               (push arg vars))))
      (setq list (cdr list)))))


(defun byte-compile-arglist-vars (arglist)
  "Return a list of the variables in the lambda argument list ARGLIST."
  (remq '&rest (remq '&optional arglist)))

(defun byte-compile-make-lambda-lexenv (form)
  "Return a new lexical environment for a lambda expression FORM."
  ;; See if this is a closure or not
  (let ((args (byte-compile-arglist-vars (cadr form))))
    (let ((lexenv nil))
      ;; Fill in the initial stack contents
      (let ((stackpos 0))
        ;; Add entries for each argument
        (dolist (arg args)
          (push (cons arg stackpos) lexenv)
          (setq stackpos (1+ stackpos)))
        ;; Return the new lexical environment
        lexenv))))

;; Byte-compile a lambda-expression and return a valid function.
;; The value is usually a compiled function but may be the original
;; lambda-expression.
;; When ADD-LAMBDA is non-nil, the symbol `lambda' is added as head
;; of the list FUN and `byte-compile-set-symbol-position' is not called.
;; Use this feature to avoid calling `byte-compile-set-symbol-position'
;; for symbols generated by the byte compiler itself.
(defun byte-compile-lambda (bytecomp-fun &optional add-lambda reserved-csts)
  (if add-lambda
      (setq bytecomp-fun (cons 'lambda bytecomp-fun))
    (unless (eq 'lambda (car-safe bytecomp-fun))
      (error "Not a lambda list: %S" bytecomp-fun))
    (byte-compile-set-symbol-position 'lambda))
  (byte-compile-check-lambda-list (nth 1 bytecomp-fun))
  (let* ((bytecomp-arglist (nth 1 bytecomp-fun))
         (byte-compile-bound-variables
          (append (and (not lexical-binding)
                       (byte-compile-arglist-vars bytecomp-arglist))
                  byte-compile-bound-variables))
         (bytecomp-body (cdr (cdr bytecomp-fun)))
         (bytecomp-doc (if (stringp (car bytecomp-body))
                           (prog1 (car bytecomp-body)
                             ;; Discard the doc string
                             ;; unless it is the last element of the body.
                             (if (cdr bytecomp-body)
                                 (setq bytecomp-body (cdr bytecomp-body))))))
         (bytecomp-int (assq 'interactive bytecomp-body)))
    ;; Process the interactive spec.
    (when bytecomp-int
      (byte-compile-set-symbol-position 'interactive)
      ;; Skip (interactive) if it is in front (the most usual location).
      (if (eq bytecomp-int (car bytecomp-body))
          (setq bytecomp-body (cdr bytecomp-body)))
      (cond ((consp (cdr bytecomp-int))
             (if (cdr (cdr bytecomp-int))
                 (byte-compile-warn "malformed interactive spec: %s"
                                    (prin1-to-string bytecomp-int)))
             ;; If the interactive spec is a call to `list', don't
             ;; compile it, because `call-interactively' looks at the
             ;; args of `list'.  Actually, compile it to get warnings,
             ;; but don't use the result.
             (let* ((form (nth 1 bytecomp-int))
                    (newform (byte-compile-top-level form)))
               (while (memq (car-safe form) '(let let* progn save-excursion))
                 (while (consp (cdr form))
                   (setq form (cdr form)))
                 (setq form (car form)))
               (if (and (eq (car-safe form) 'list)
                        ;; The spec is evaled in callint.c in dynamic-scoping
                        ;; mode, so just leaving the form unchanged would mean
                        ;; it won't be eval'd in the right mode.
                        (not lexical-binding))
                   nil
                 (setq bytecomp-int `(interactive ,newform)))))
            ((cdr bytecomp-int)
             (byte-compile-warn "malformed interactive spec: %s"
                                (prin1-to-string bytecomp-int)))))
    ;; Process the body.
    (let* ((compiled
            (byte-compile-top-level (cons 'progn bytecomp-body) nil 'lambda
                                    ;; If doing lexical binding, push a new
                                    ;; lexical environment containing just the
                                    ;; args (since lambda expressions should be
                                    ;; closed by now).
                                    (and lexical-binding
                                         (byte-compile-make-lambda-lexenv
                                          bytecomp-fun))
                                    reserved-csts)))
      ;; Build the actual byte-coded function.
      (if (eq 'byte-code (car-safe compiled))
          (apply 'make-byte-code
                 (append (list bytecomp-arglist)
                         ;; byte-string, constants-vector, stack depth
                         (cdr compiled)
                         ;; optionally, the doc string.
                         (if (or bytecomp-doc bytecomp-int
                                 lexical-binding)
                             (list bytecomp-doc))
                         ;; optionally, the interactive spec.
                         (if (or bytecomp-int lexical-binding)
                             (list (nth 1 bytecomp-int)))
                         (if lexical-binding
                             '(t))))
        (setq compiled
              (nconc (if bytecomp-int (list bytecomp-int))
                     (cond ((eq (car-safe compiled) 'progn) (cdr compiled))
                           (compiled (list compiled)))))
        (nconc (list 'lambda bytecomp-arglist)
               (if (or bytecomp-doc (stringp (car compiled)))
                   (cons bytecomp-doc (cond (compiled)
                                   (bytecomp-body (list nil))))
                 compiled))))))

(defun byte-compile-closure (form &optional add-lambda)
  (let ((code (byte-compile-lambda form add-lambda)))
    ;; A simple lambda is just a constant.
    (byte-compile-constant code)))

(defvar byte-compile-reserved-constants 0)

(defun byte-compile-constants-vector ()
  ;; Builds the constants-vector from the current variables and constants.
  ;;   This modifies the constants from (const . nil) to (const . offset).
  ;; To keep the byte-codes to look up the vector as short as possible:
  ;;   First 6 elements are vars, as there are one-byte varref codes for those.
  ;;   Next up to byte-constant-limit are constants, still with one-byte codes.
  ;;   Next variables again, to get 2-byte codes for variable lookup.
  ;;   The rest of the constants and variables need 3-byte byte-codes.
  (let* ((i (1- byte-compile-reserved-constants))
         (rest (nreverse byte-compile-variables)) ; nreverse because the first
         (other (nreverse byte-compile-constants)) ; vars often are used most.
         ret tmp
         (limits '(5                    ; Use the 1-byte varref codes,
                   63  ; 1-constlim     ;  1-byte byte-constant codes,
                   255                  ;  2-byte varref codes,
                   65535))              ;  3-byte codes for the rest.
         limit)
    (while (or rest other)
      (setq limit (car limits))
      (while (and rest (< i limit))
        (cond
         ((numberp (car rest))
          (assert (< (car rest) byte-compile-reserved-constants)))
         ((setq tmp (assq (car (car rest)) ret))
          (setcdr (car rest) (cdr tmp)))
         (t
          (setcdr (car rest) (setq i (1+ i)))
          (setq ret (cons (car rest) ret))))
        (setq rest (cdr rest)))
      (setq limits (cdr limits)
            rest (prog1 other
                   (setq other rest))))
    (apply 'vector (nreverse (mapcar 'car ret)))))

;; Given an expression FORM, compile it and return an equivalent byte-code
;; expression (a call to the function byte-code).
(defun byte-compile-top-level (form &optional for-effect output-type
                                    lexenv reserved-csts)
  ;; OUTPUT-TYPE advises about how form is expected to be used:
  ;;    'eval or nil    -> a single form,
  ;;    'progn or t     -> a list of forms,
  ;;    'lambda         -> body of a lambda,
  ;;    'file           -> used at file-level.
  (let ((byte-compile-constants nil)
        (byte-compile-variables nil)
        (byte-compile-tag-number 0)
        (byte-compile-depth 0)
        (byte-compile-maxdepth 0)
        (byte-compile-lexical-environment lexenv)
        (byte-compile-reserved-constants (or reserved-csts 0))
        (byte-compile-output nil))
    (if (memq byte-optimize '(t source))
        (setq form (byte-optimize-form form for-effect)))
    (while (and (eq (car-safe form) 'progn) (null (cdr (cdr form))))
      (setq form (nth 1 form)))
    (if (and (eq 'byte-code (car-safe form))
             (not (memq byte-optimize '(t byte)))
             (stringp (nth 1 form)) (vectorp (nth 2 form))
             (natnump (nth 3 form)))
        form
      ;; Set up things for a lexically-bound function.
      (when (and lexical-binding (eq output-type 'lambda))
        ;; See how many arguments there are, and set the current stack depth
        ;; accordingly.
        (setq byte-compile-depth (length byte-compile-lexical-environment))
        ;; If there are args, output a tag to record the initial
        ;; stack-depth for the optimizer.
        (when (> byte-compile-depth 0)
          (byte-compile-out-tag (byte-compile-make-tag))))
      ;; Now compile FORM
      (byte-compile-form form for-effect)
      (byte-compile-out-toplevel for-effect output-type))))

(defun byte-compile-out-toplevel (&optional for-effect output-type)
  (if for-effect
      ;; The stack is empty. Push a value to be returned from (byte-code ..).
      (if (eq (car (car byte-compile-output)) 'byte-discard)
          (setq byte-compile-output (cdr byte-compile-output))
        (byte-compile-push-constant
         ;; Push any constant - preferably one which already is used, and
         ;; a number or symbol - ie not some big sequence.  The return value
         ;; isn't returned, but it would be a shame if some textually large
         ;; constant was not optimized away because we chose to return it.
         (and (not (assq nil byte-compile-constants)) ; Nil is often there.
              (let ((tmp (reverse byte-compile-constants)))
                (while (and tmp (not (or (symbolp (caar tmp))
                                         (numberp (caar tmp)))))
                  (setq tmp (cdr tmp)))
                (caar tmp))))))
  (byte-compile-out 'byte-return 0)
  (setq byte-compile-output (nreverse byte-compile-output))
  (if (memq byte-optimize '(t byte))
      (setq byte-compile-output
            (byte-optimize-lapcode byte-compile-output for-effect)))

  ;; Decompile trivial functions:
  ;; only constants and variables, or a single funcall except in lambdas.
  ;; Except for Lisp_Compiled objects, forms like (foo "hi")
  ;; are still quicker than (byte-code "..." [foo "hi"] 2).
  ;; Note that even (quote foo) must be parsed just as any subr by the
  ;; interpreter, so quote should be compiled into byte-code in some contexts.
  ;; What to leave uncompiled:
  ;;    lambda  -> never.  we used to leave it uncompiled if the body was
  ;;               a single atom, but that causes confusion if the docstring
  ;;               uses the (file . pos) syntax.  Besides, now that we have
  ;;               the Lisp_Compiled type, the compiled form is faster.
  ;;    eval    -> atom, quote or (function atom atom atom)
  ;;    progn   -> as <<same-as-eval>> or (progn <<same-as-eval>> atom)
  ;;    file    -> as progn, but takes both quotes and atoms, and longer forms.
  (let (rest
        (maycall (not (eq output-type 'lambda))) ; t if we may make a funcall.
        tmp body)
    (cond
     ;; #### This should be split out into byte-compile-nontrivial-function-p.
     ((or (eq output-type 'lambda)
          (nthcdr (if (eq output-type 'file) 50 8) byte-compile-output)
          (assq 'TAG byte-compile-output) ; Not necessary, but speeds up a bit.
          (not (setq tmp (assq 'byte-return byte-compile-output)))
          (progn
            (setq rest (nreverse
                        (cdr (memq tmp (reverse byte-compile-output)))))
            (while (cond
                    ((memq (car (car rest)) '(byte-varref byte-constant))
                     (setq tmp (car (cdr (car rest))))
                     (if (if (eq (car (car rest)) 'byte-constant)
                             (or (consp tmp)
                                 (and (symbolp tmp)
                                      (not (byte-compile-const-symbol-p tmp)))))
                         (if maycall
                             (setq body (cons (list 'quote tmp) body)))
                       (setq body (cons tmp body))))
                    ((and maycall
                          ;; Allow a funcall if at most one atom follows it.
                          (null (nthcdr 3 rest))
                          (setq tmp (get (car (car rest)) 'byte-opcode-invert))
                          (or (null (cdr rest))
                              (and (memq output-type '(file progn t))
                                   (cdr (cdr rest))
                                   (eq (car (nth 1 rest)) 'byte-discard)
                                   (progn (setq rest (cdr rest)) t))))
                     (setq maycall nil) ; Only allow one real function call.
                     (setq body (nreverse body))
                     (setq body (list
                                 (if (and (eq tmp 'funcall)
                                          (eq (car-safe (car body)) 'quote))
                                     (cons (nth 1 (car body)) (cdr body))
                                   (cons tmp body))))
                     (or (eq output-type 'file)
                         (not (delq nil (mapcar 'consp (cdr (car body))))))))
              (setq rest (cdr rest)))
            rest))
      (let ((byte-compile-vector (byte-compile-constants-vector)))
        (list 'byte-code (byte-compile-lapcode byte-compile-output)
              byte-compile-vector byte-compile-maxdepth)))
     ;; it's a trivial function
     ((cdr body) (cons 'progn (nreverse body)))
     ((car body)))))

;; Given BYTECOMP-BODY, compile it and return a new body.
(defun byte-compile-top-level-body (bytecomp-body &optional for-effect)
  (setq bytecomp-body
        (byte-compile-top-level (cons 'progn bytecomp-body) for-effect t))
  (cond ((eq (car-safe bytecomp-body) 'progn)
         (cdr bytecomp-body))
        (bytecomp-body
         (list bytecomp-body))))

;; Special macro-expander used during byte-compilation.
(defun byte-compile-macroexpand-declare-function (fn file &rest args)
  (push (cons fn
              (if (and (consp args) (listp (car args)))
                  (list 'declared (car args))
                t))                     ; arglist not specified
        byte-compile-function-environment)
  ;; We are stating that it _will_ be defined at runtime.
  (setq byte-compile-noruntime-functions
        (delq fn byte-compile-noruntime-functions))
  ;; Delegate the rest to the normal macro definition.
  (macroexpand `(declare-function ,fn ,file ,@args)))

\f
;; This is the recursive entry point for compiling each subform of an
;; expression.
;; If for-effect is non-nil, byte-compile-form will output a byte-discard
;; before terminating (ie no value will be left on the stack).
;; A byte-compile handler may, when for-effect is non-nil, choose output code
;; which does not leave a value on the stack, and then set for-effect to nil
;; (to prevent byte-compile-form from outputting the byte-discard).
;; If a handler wants to call another handler, it should do so via
;; byte-compile-form, or take extreme care to handle for-effect correctly.
;; (Use byte-compile-form-do-effect to reset the for-effect flag too.)
;;
(defun byte-compile-form (form &optional for-effect)
  (cond ((not (consp form))
         (cond ((or (not (symbolp form)) (byte-compile-const-symbol-p form))
                (when (symbolp form)
                  (byte-compile-set-symbol-position form))
                (byte-compile-constant form))
               ((and for-effect byte-compile-delete-errors)
                (when (symbolp form)
                  (byte-compile-set-symbol-position form))
                (setq for-effect nil))
               (t
                (byte-compile-variable-ref form))))
        ((symbolp (car form))
         (let* ((bytecomp-fn (car form))
                (bytecomp-handler (get bytecomp-fn 'byte-compile)))
           (when (byte-compile-const-symbol-p bytecomp-fn)
             (byte-compile-warn "`%s' called as a function" bytecomp-fn))
           (and (byte-compile-warning-enabled-p 'interactive-only)
                (memq bytecomp-fn byte-compile-interactive-only-functions)
                (byte-compile-warn "`%s' used from Lisp code\n\
That command is designed for interactive use only" bytecomp-fn))
           (if (and (fboundp (car form))
                    (eq (car-safe (symbol-function (car form))) 'macro))
               (byte-compile-report-error
                (format "Forgot to expand macro %s" (car form))))
           (if (and bytecomp-handler
                    ;; Make sure that function exists.  This is important
                    ;; for CL compiler macros since the symbol may be
                    ;; `cl-byte-compile-compiler-macro' but if CL isn't
                    ;; loaded, this function doesn't exist.
                    (and (not (eq bytecomp-handler
                                  ;; Already handled by macroexpand-all.
                                  'cl-byte-compile-compiler-macro))
                         (functionp bytecomp-handler)))
               (funcall bytecomp-handler form)
             (byte-compile-normal-call form))
           (if (byte-compile-warning-enabled-p 'cl-functions)
               (byte-compile-cl-warn form))))
        ((and (or (byte-code-function-p (car form))
                  (eq (car-safe (car form)) 'lambda))
              ;; if the form comes out the same way it went in, that's
              ;; because it was malformed, and we couldn't unfold it.
              (not (eq form (setq form (byte-compile-unfold-lambda form)))))
         (byte-compile-form form for-effect)
         (setq for-effect nil))
        ((byte-compile-normal-call form)))
  (if for-effect
      (byte-compile-discard)))

(defun byte-compile-normal-call (form)
  (when (and (byte-compile-warning-enabled-p 'callargs)
             (symbolp (car form)))
    (if (memq (car form)
              '(custom-declare-group custom-declare-variable
                                     custom-declare-face))
        (byte-compile-nogroup-warn form))
    (when (get (car form) 'byte-obsolete-info)
      (byte-compile-warn-obsolete (car form)))
    (byte-compile-callargs-warn form))
  (if byte-compile-generate-call-tree
      (byte-compile-annotate-call-tree form))
  (when (and for-effect (eq (car form) 'mapcar)
             (byte-compile-warning-enabled-p 'mapcar))
    (byte-compile-set-symbol-position 'mapcar)
    (byte-compile-warn
     "`mapcar' called for effect; use `mapc' or `dolist' instead"))
  (byte-compile-push-constant (car form))
  (mapc 'byte-compile-form (cdr form))  ; wasteful, but faster.
  (byte-compile-out 'byte-call (length (cdr form))))

(defun byte-compile-check-variable (var &optional binding)
  "Do various error checks before a use of the variable VAR.
If BINDING is non-nil, VAR is being bound."
  (when (symbolp var)
    (byte-compile-set-symbol-position var))
  (cond ((or (not (symbolp var)) (byte-compile-const-symbol-p var))
         (when (byte-compile-warning-enabled-p 'constants)
           (byte-compile-warn (if binding
                                  "attempt to let-bind %s `%s`"
                                "variable reference to %s `%s'")
                              (if (symbolp var) "constant" "nonvariable")
                              (prin1-to-string var))))
        ((and (get var 'byte-obsolete-variable)
              (not (memq var byte-compile-not-obsolete-vars)))
         (byte-compile-warn-obsolete var))))

(defsubst byte-compile-dynamic-variable-op (base-op var)
  (let ((tmp (assq var byte-compile-variables)))
    (unless tmp
      (setq tmp (list var))
      (push tmp byte-compile-variables))
    (byte-compile-out base-op tmp)))

(defun byte-compile-dynamic-variable-bind (var)
  "Generate code to bind the lexical variable VAR to the top-of-stack value."
  (byte-compile-check-variable var t)
  (push var byte-compile-bound-variables)
  (byte-compile-dynamic-variable-op 'byte-varbind var))

(defun byte-compile-variable-ref (var)
  "Generate code to push the value of the variable VAR on the stack."
  (byte-compile-check-variable var)
  (let ((lex-binding (assq var byte-compile-lexical-environment)))
    (if lex-binding
        ;; VAR is lexically bound
        (byte-compile-stack-ref (cdr lex-binding))
      ;; VAR is dynamically bound
      (unless (or (not (byte-compile-warning-enabled-p 'free-vars))
                  (boundp var)
                  (memq var byte-compile-bound-variables)
                  (memq var byte-compile-free-references))
        (byte-compile-warn "reference to free variable `%S'" var)
        (push var byte-compile-free-references))
      (byte-compile-dynamic-variable-op 'byte-varref var))))

(defun byte-compile-variable-set (var)
  "Generate code to set the variable VAR from the top-of-stack value."
  (byte-compile-check-variable var)
  (let ((lex-binding (assq var byte-compile-lexical-environment)))
    (if lex-binding
        ;; VAR is lexically bound
        (byte-compile-stack-set (cdr lex-binding))
      ;; VAR is dynamically bound
      (unless (or (not (byte-compile-warning-enabled-p 'free-vars))
                  (boundp var)
                  (memq var byte-compile-bound-variables)
                  (memq var byte-compile-free-assignments))
        (byte-compile-warn "assignment to free variable `%s'" var)
        (push var byte-compile-free-assignments))
      (byte-compile-dynamic-variable-op 'byte-varset var))))

(defmacro byte-compile-get-constant (const)
  `(or (if (stringp ,const)
           ;; In a string constant, treat properties as significant.
           (let (result)
             (dolist (elt byte-compile-constants)
               (if (equal-including-properties (car elt) ,const)
                   (setq result elt)))
             result)
         (assq ,const byte-compile-constants))
       (car (setq byte-compile-constants
                  (cons (list ,const) byte-compile-constants)))))

;; Use this when the value of a form is a constant.  This obeys for-effect.
(defun byte-compile-constant (const)
  (if for-effect
      (setq for-effect nil)
    (when (symbolp const)
      (byte-compile-set-symbol-position const))
    (byte-compile-out 'byte-constant (byte-compile-get-constant const))))

;; Use this for a constant that is not the value of its containing form.
;; This ignores for-effect.
(defun byte-compile-push-constant (const)
  (let ((for-effect nil))
    (inline (byte-compile-constant const))))
\f
;; Compile those primitive ordinary functions
;; which have special byte codes just for speed.

(defmacro byte-defop-compiler (function &optional compile-handler)
  "Add a compiler-form for FUNCTION.
If function is a symbol, then the variable \"byte-SYMBOL\" must name
the opcode to be used.  If function is a list, the first element
is the function and the second element is the bytecode-symbol.
The second element may be nil, meaning there is no opcode.
COMPILE-HANDLER is the function to use to compile this byte-op, or
may be the abbreviations 0, 1, 2, 3, 0-1, or 1-2.
If it is nil, then the handler is \"byte-compile-SYMBOL.\""
  (let (opcode)
    (if (symbolp function)
        (setq opcode (intern (concat "byte-" (symbol-name function))))
      (setq opcode (car (cdr function))
            function (car function)))
    (let ((fnform
           (list 'put (list 'quote function) ''byte-compile
                 (list 'quote
                       (or (cdr (assq compile-handler
                                      '((0 . byte-compile-no-args)
                                        (1 . byte-compile-one-arg)
                                        (2 . byte-compile-two-args)
                                        (3 . byte-compile-three-args)
                                        (0-1 . byte-compile-zero-or-one-arg)
                                        (1-2 . byte-compile-one-or-two-args)
                                        (2-3 . byte-compile-two-or-three-args)
                                        )))
                           compile-handler
                           (intern (concat "byte-compile-"
                                           (symbol-name function))))))))
      (if opcode
          (list 'progn fnform
                (list 'put (list 'quote function)
                      ''byte-opcode (list 'quote opcode))
                (list 'put (list 'quote opcode)
                      ''byte-opcode-invert (list 'quote function)))
        fnform))))

(defmacro byte-defop-compiler-1 (function &optional compile-handler)
  (list 'byte-defop-compiler (list function nil) compile-handler))

\f
(put 'byte-call 'byte-opcode-invert 'funcall)
(put 'byte-list1 'byte-opcode-invert 'list)
(put 'byte-list2 'byte-opcode-invert 'list)
(put 'byte-list3 'byte-opcode-invert 'list)
(put 'byte-list4 'byte-opcode-invert 'list)
(put 'byte-listN 'byte-opcode-invert 'list)
(put 'byte-concat2 'byte-opcode-invert 'concat)
(put 'byte-concat3 'byte-opcode-invert 'concat)
(put 'byte-concat4 'byte-opcode-invert 'concat)
(put 'byte-concatN 'byte-opcode-invert 'concat)
(put 'byte-insertN 'byte-opcode-invert 'insert)

(byte-defop-compiler point              0)
;;(byte-defop-compiler mark             0) ;; obsolete
(byte-defop-compiler point-max          0)
(byte-defop-compiler point-min          0)
(byte-defop-compiler following-char     0)
(byte-defop-compiler preceding-char     0)
(byte-defop-compiler current-column     0)
(byte-defop-compiler eolp               0)
(byte-defop-compiler eobp               0)
(byte-defop-compiler bolp               0)
(byte-defop-compiler bobp               0)
(byte-defop-compiler current-buffer     0)
;;(byte-defop-compiler read-char        0) ;; obsolete
(byte-defop-compiler widen              0)
(byte-defop-compiler end-of-line    0-1)
(byte-defop-compiler forward-char   0-1)
(byte-defop-compiler forward-line   0-1)
(byte-defop-compiler symbolp            1)
(byte-defop-compiler consp              1)
(byte-defop-compiler stringp            1)
(byte-defop-compiler listp              1)
(byte-defop-compiler not                1)
(byte-defop-compiler (null byte-not)    1)
(byte-defop-compiler car                1)
(byte-defop-compiler cdr                1)
(byte-defop-compiler length             1)
(byte-defop-compiler symbol-value       1)
(byte-defop-compiler symbol-function    1)
(byte-defop-compiler (1+ byte-add1)     1)
(byte-defop-compiler (1- byte-sub1)     1)
(byte-defop-compiler goto-char          1)
(byte-defop-compiler char-after         0-1)
(byte-defop-compiler set-buffer         1)
;;(byte-defop-compiler set-mark         1) ;; obsolete
(byte-defop-compiler forward-word       0-1)
(byte-defop-compiler char-syntax        1)
(byte-defop-compiler nreverse           1)
(byte-defop-compiler car-safe           1)
(byte-defop-compiler cdr-safe           1)
(byte-defop-compiler numberp            1)
(byte-defop-compiler integerp           1)
(byte-defop-compiler skip-chars-forward     1-2)
(byte-defop-compiler skip-chars-backward    1-2)
(byte-defop-compiler eq                 2)
(byte-defop-compiler memq               2)
(byte-defop-compiler cons               2)
(byte-defop-compiler aref               2)
(byte-defop-compiler set                2)
(byte-defop-compiler (= byte-eqlsign)   2)
(byte-defop-compiler (< byte-lss)       2)
(byte-defop-compiler (> byte-gtr)       2)
(byte-defop-compiler (<= byte-leq)      2)
(byte-defop-compiler (>= byte-geq)      2)
(byte-defop-compiler get                2)
(byte-defop-compiler nth                2)
(byte-defop-compiler substring          2-3)
(byte-defop-compiler (move-marker byte-set-marker) 2-3)
(byte-defop-compiler set-marker 2-3)
(byte-defop-compiler match-beginning    1)
(byte-defop-compiler match-end  1)
(byte-defop-compiler upcase             1)
(byte-defop-compiler downcase           1)
(byte-defop-compiler string=            2)
(byte-defop-compiler string<            2)
(byte-defop-compiler (string-equal byte-string=) 2)
(byte-defop-compiler (string-lessp byte-string<) 2)
(byte-defop-compiler equal              2)
(byte-defop-compiler nthcdr             2)
(byte-defop-compiler elt                2)
(byte-defop-compiler member             2)
(byte-defop-compiler assq               2)
(byte-defop-compiler (rplaca byte-setcar) 2)
(byte-defop-compiler (rplacd byte-setcdr) 2)
(byte-defop-compiler setcar             2)
(byte-defop-compiler setcdr             2)
(byte-defop-compiler buffer-substring   2)
(byte-defop-compiler delete-region      2)
(byte-defop-compiler narrow-to-region   2)
(byte-defop-compiler (% byte-rem)       2)
(byte-defop-compiler aset               3)

(byte-defop-compiler max                byte-compile-associative)
(byte-defop-compiler min                byte-compile-associative)
(byte-defop-compiler (+ byte-plus)      byte-compile-associative)
(byte-defop-compiler (* byte-mult)      byte-compile-associative)

;;####(byte-defop-compiler move-to-column       1)
(byte-defop-compiler-1 interactive byte-compile-noop)

\f
(defun byte-compile-subr-wrong-args (form n)
  (byte-compile-set-symbol-position (car form))
  (byte-compile-warn "`%s' called with %d arg%s, but requires %s"
                     (car form) (length (cdr form))
                     (if (= 1 (length (cdr form))) "" "s") n)
  ;; get run-time wrong-number-of-args error.
  (byte-compile-normal-call form))

(defun byte-compile-no-args (form)
  (if (not (= (length form) 1))
      (byte-compile-subr-wrong-args form "none")
    (byte-compile-out (get (car form) 'byte-opcode) 0)))

(defun byte-compile-one-arg (form)
  (if (not (= (length form) 2))
      (byte-compile-subr-wrong-args form 1)
    (byte-compile-form (car (cdr form)))  ;; Push the argument
    (byte-compile-out (get (car form) 'byte-opcode) 0)))

(defun byte-compile-two-args (form)
  (if (not (= (length form) 3))
      (byte-compile-subr-wrong-args form 2)
    (byte-compile-form (car (cdr form)))  ;; Push the arguments
    (byte-compile-form (nth 2 form))
    (byte-compile-out (get (car form) 'byte-opcode) 0)))

(defun byte-compile-three-args (form)
  (if (not (= (length form) 4))
      (byte-compile-subr-wrong-args form 3)
    (byte-compile-form (car (cdr form)))  ;; Push the arguments
    (byte-compile-form (nth 2 form))
    (byte-compile-form (nth 3 form))
    (byte-compile-out (get (car form) 'byte-opcode) 0)))

(defun byte-compile-zero-or-one-arg (form)
  (let ((len (length form)))
    (cond ((= len 1) (byte-compile-one-arg (append form '(nil))))
          ((= len 2) (byte-compile-one-arg form))
          (t (byte-compile-subr-wrong-args form "0-1")))))

(defun byte-compile-one-or-two-args (form)
  (let ((len (length form)))
    (cond ((= len 2) (byte-compile-two-args (append form '(nil))))
          ((= len 3) (byte-compile-two-args form))
          (t (byte-compile-subr-wrong-args form "1-2")))))

(defun byte-compile-two-or-three-args (form)
  (let ((len (length form)))
    (cond ((= len 3) (byte-compile-three-args (append form '(nil))))
          ((= len 4) (byte-compile-three-args form))
          (t (byte-compile-subr-wrong-args form "2-3")))))

(defun byte-compile-noop (form)
  (byte-compile-constant nil))

(defun byte-compile-discard (&optional num preserve-tos)
  "Output byte codes to discard the NUM entries at the top of the stack (NUM defaults to 1).
If PRESERVE-TOS is non-nil, preserve the top-of-stack value, as if it were
popped before discarding the num values, and then pushed back again after
discarding."
  (if (and (null num) (not preserve-tos))
      ;; common case
      (byte-compile-out 'byte-discard)
    ;; general case
    (unless num
      (setq num 1))
    (when (and preserve-tos (> num 0))
      ;; Preserve the top-of-stack value by writing it directly to the stack
      ;; location which will be at the top-of-stack after popping.
      (byte-compile-stack-set (1- (- byte-compile-depth num)))
      ;; Now we actually discard one less value, since we want to keep
      ;; the eventual TOS
      (setq num (1- num)))
    (while (> num 0)
      (byte-compile-out 'byte-discard)
      (setq num (1- num)))))

(defun byte-compile-stack-ref (stack-pos)
  "Output byte codes to push the value at position STACK-POS in the stack, on the top of the stack."
  (let ((dist (- byte-compile-depth (1+ stack-pos))))
    (if (zerop dist)
        ;; A simple optimization
        (byte-compile-out 'byte-dup)
      ;; normal case
      (byte-compile-out 'byte-stack-ref dist))))

(defun byte-compile-stack-set (stack-pos)
  "Output byte codes to store the top-of-stack value at position STACK-POS in the stack."
  (byte-compile-out 'byte-stack-set (- byte-compile-depth (1+ stack-pos))))

(byte-defop-compiler-1 internal-make-closure byte-compile-make-closure)
(byte-defop-compiler-1 internal-get-closed-var byte-compile-get-closed-var)

(defconst byte-compile--env-var (make-symbol "env"))

(defun byte-compile-make-closure (form)
  (if for-effect (setq for-effect nil)
    (let* ((vars (nth 1 form))
           (env (nth 2 form))
           (body (nthcdr 3 form))
           (fun
            (byte-compile-lambda `(lambda ,vars . ,body) nil (length env))))
      (assert (byte-code-function-p fun))
      (byte-compile-form `(make-byte-code
                           ',(aref fun 0) ',(aref fun 1)
                           (vconcat (vector . ,env) ',(aref fun 2))
                           ,@(nthcdr 3 (mapcar (lambda (x) `',x) fun)))))))
    

(defun byte-compile-get-closed-var (form)
  (if for-effect (setq for-effect nil)
    (byte-compile-out 'byte-constant ;; byte-closed-var
                      (nth 1 form))))

;; Compile a function that accepts one or more args and is right-associative.
;; We do it by left-associativity so that the operations
;; are done in the same order as in interpreted code.
;; We treat the one-arg case, as in (+ x), like (+ x 0).
;; in order to convert markers to numbers, and trigger expected errors.
(defun byte-compile-associative (form)
  (if (cdr form)
      (let ((opcode (get (car form) 'byte-opcode))
            args)
        (if (and (< 3 (length form))
                 (memq opcode (list (get '+ 'byte-opcode)
                                    (get '* 'byte-opcode))))
            ;; Don't use binary operations for > 2 operands, as that
            ;; may cause overflow/truncation in float operations.
            (byte-compile-normal-call form)
          (setq args (copy-sequence (cdr form)))
          (byte-compile-form (car args))
          (setq args (cdr args))
          (or args (setq args '(0)
                         opcode (get '+ 'byte-opcode)))
          (dolist (arg args)
            (byte-compile-form arg)
            (byte-compile-out opcode 0))))
    (byte-compile-constant (eval form))))

\f
;; more complicated compiler macros

(byte-defop-compiler char-before)
(byte-defop-compiler backward-char)
(byte-defop-compiler backward-word)
(byte-defop-compiler list)
(byte-defop-compiler concat)
(byte-defop-compiler fset)
(byte-defop-compiler (indent-to-column byte-indent-to) byte-compile-indent-to)
(byte-defop-compiler indent-to)
(byte-defop-compiler insert)
(byte-defop-compiler-1 function byte-compile-function-form)
(byte-defop-compiler-1 - byte-compile-minus)
(byte-defop-compiler (/ byte-quo) byte-compile-quo)
(byte-defop-compiler nconc)

(defun byte-compile-char-before (form)
  (cond ((= 2 (length form))
         (byte-compile-form (list 'char-after (if (numberp (nth 1 form))
                                                  (1- (nth 1 form))
                                                `(1- ,(nth 1 form))))))
        ((= 1 (length form))
         (byte-compile-form '(char-after (1- (point)))))
        (t (byte-compile-subr-wrong-args form "0-1"))))

;; backward-... ==> forward-... with negated argument.
(defun byte-compile-backward-char (form)
  (cond ((= 2 (length form))
         (byte-compile-form (list 'forward-char (if (numberp (nth 1 form))
                                                    (- (nth 1 form))
                                                  `(- ,(nth 1 form))))))
        ((= 1 (length form))
         (byte-compile-form '(forward-char -1)))
        (t (byte-compile-subr-wrong-args form "0-1"))))

(defun byte-compile-backward-word (form)
  (cond ((= 2 (length form))
         (byte-compile-form (list 'forward-word (if (numberp (nth 1 form))
                                                    (- (nth 1 form))
                                                  `(- ,(nth 1 form))))))
        ((= 1 (length form))
         (byte-compile-form '(forward-word -1)))
        (t (byte-compile-subr-wrong-args form "0-1"))))

(defun byte-compile-list (form)
  (let ((count (length (cdr form))))
    (cond ((= count 0)
           (byte-compile-constant nil))
          ((< count 5)
           (mapc 'byte-compile-form (cdr form))
           (byte-compile-out
            (aref [byte-list1 byte-list2 byte-list3 byte-list4] (1- count)) 0))
          ((< count 256)
           (mapc 'byte-compile-form (cdr form))
           (byte-compile-out 'byte-listN count))
          (t (byte-compile-normal-call form)))))

(defun byte-compile-concat (form)
  (let ((count (length (cdr form))))
    (cond ((and (< 1 count) (< count 5))
           (mapc 'byte-compile-form (cdr form))
           (byte-compile-out
            (aref [byte-concat2 byte-concat3 byte-concat4] (- count 2))
            0))
          ;; Concat of one arg is not a no-op if arg is not a string.
          ((= count 0)
           (byte-compile-form ""))
          ((< count 256)
           (mapc 'byte-compile-form (cdr form))
           (byte-compile-out 'byte-concatN count))
          ((byte-compile-normal-call form)))))

(defun byte-compile-minus (form)
  (let ((len (length form)))
    (cond
     ((= 1 len) (byte-compile-constant 0))
     ((= 2 len)
      (byte-compile-form (cadr form))
      (byte-compile-out 'byte-negate 0))
     ((= 3 len)
      (byte-compile-form (nth 1 form))
      (byte-compile-form (nth 2 form))
      (byte-compile-out 'byte-diff 0))
     ;; Don't use binary operations for > 2 operands, as that may
     ;; cause overflow/truncation in float operations.
     (t (byte-compile-normal-call form)))))

(defun byte-compile-quo (form)
  (let ((len (length form)))
    (cond ((<= len 2)
           (byte-compile-subr-wrong-args form "2 or more"))
          ((= len 3)
           (byte-compile-two-args form))
          (t
           ;; Don't use binary operations for > 2 operands, as that
           ;; may cause overflow/truncation in float operations.
           (byte-compile-normal-call form)))))

(defun byte-compile-nconc (form)
  (let ((len (length form)))
    (cond ((= len 1)
           (byte-compile-constant nil))
          ((= len 2)
           ;; nconc of one arg is a noop, even if that arg isn't a list.
           (byte-compile-form (nth 1 form)))
          (t
           (byte-compile-form (car (setq form (cdr form))))
           (while (setq form (cdr form))
             (byte-compile-form (car form))
             (byte-compile-out 'byte-nconc 0))))))

(defun byte-compile-fset (form)
  ;; warn about forms like (fset 'foo '(lambda () ...))
  ;; (where the lambda expression is non-trivial...)
  (let ((fn (nth 2 form))
        body)
    (if (and (eq (car-safe fn) 'quote)
             (eq (car-safe (setq fn (nth 1 fn))) 'lambda))
        (progn
          (setq body (cdr (cdr fn)))
          (if (stringp (car body)) (setq body (cdr body)))
          (if (eq 'interactive (car-safe (car body))) (setq body (cdr body)))
          (if (and (consp (car body))
                   (not (eq 'byte-code (car (car body)))))
              (byte-compile-warn
      "A quoted lambda form is the second argument of `fset'.  This is probably
     not what you want, as that lambda cannot be compiled.  Consider using
     the syntax (function (lambda (...) ...)) instead.")))))
  (byte-compile-two-args form))

;; (function foo) must compile like 'foo, not like (symbol-function 'foo).
;; Otherwise it will be incompatible with the interpreter,
;; and (funcall (function foo)) will lose with autoloads.

(defun byte-compile-function-form (form)
  (if (symbolp (nth 1 form))
      (byte-compile-constant (nth 1 form))
    (byte-compile-closure (nth 1 form))))

(defun byte-compile-indent-to (form)
  (let ((len (length form)))
    (cond ((= len 2)
           (byte-compile-form (car (cdr form)))
           (byte-compile-out 'byte-indent-to 0))
          ((= len 3)
           ;; no opcode for 2-arg case.
           (byte-compile-normal-call form))
          (t
           (byte-compile-subr-wrong-args form "1-2")))))

(defun byte-compile-insert (form)
  (cond ((null (cdr form))
         (byte-compile-constant nil))
        ((<= (length form) 256)
         (mapc 'byte-compile-form (cdr form))
         (if (cdr (cdr form))
             (byte-compile-out 'byte-insertN (length (cdr form)))
           (byte-compile-out 'byte-insert 0)))
        ((memq t (mapcar 'consp (cdr (cdr form))))
         (byte-compile-normal-call form))
        ;; We can split it; there is no function call after inserting 1st arg.
        (t
         (while (setq form (cdr form))
           (byte-compile-form (car form))
           (byte-compile-out 'byte-insert 0)
           (if (cdr form)
               (byte-compile-discard))))))

\f
(byte-defop-compiler-1 setq)
(byte-defop-compiler-1 setq-default)
(byte-defop-compiler-1 quote)

(defun byte-compile-setq (form)
  (let ((bytecomp-args (cdr form)))
    (if bytecomp-args
        (while bytecomp-args
          (byte-compile-form (car (cdr bytecomp-args)))
          (or for-effect (cdr (cdr bytecomp-args))
              (byte-compile-out 'byte-dup 0))
          (byte-compile-variable-set (car bytecomp-args))
          (setq bytecomp-args (cdr (cdr bytecomp-args))))
      ;; (setq), with no arguments.
      (byte-compile-form nil for-effect))
    (setq for-effect nil)))

(defun byte-compile-setq-default (form)
  (setq form (cdr form))
  (if (> (length form) 2)
      (let ((setters ()))
        (while (consp form)
          (push `(setq-default ,(pop form) ,(pop form)) setters))
        (byte-compile-form (cons 'progn (nreverse setters))))
    (let ((var (car form)))
      (and (or (not (symbolp var))
               (byte-compile-const-symbol-p var t))
           (byte-compile-warning-enabled-p 'constants)
           (byte-compile-warn
            "variable assignment to %s `%s'"
            (if (symbolp var) "constant" "nonvariable")
            (prin1-to-string var)))
      (byte-compile-normal-call `(set-default ',var ,@(cdr form))))))

(byte-defop-compiler-1 set-default)
(defun byte-compile-set-default (form)
  (let ((varexp (car-safe (cdr-safe form))))
    (if (eq (car-safe varexp) 'quote)
        ;; If the varexp is constant, compile it as a setq-default
        ;; so we get more warnings.
        (byte-compile-setq-default `(setq-default ,(car-safe (cdr varexp))
                                                  ,@(cddr form)))
      (byte-compile-normal-call form))))

(defun byte-compile-quote (form)
  (byte-compile-constant (car (cdr form))))
\f
;;; control structures

(defun byte-compile-body (bytecomp-body &optional for-effect)
  (while (cdr bytecomp-body)
    (byte-compile-form (car bytecomp-body) t)
    (setq bytecomp-body (cdr bytecomp-body)))
  (byte-compile-form (car bytecomp-body) for-effect))

(defsubst byte-compile-body-do-effect (bytecomp-body)
  (byte-compile-body bytecomp-body for-effect)
  (setq for-effect nil))

(defsubst byte-compile-form-do-effect (form)
  (byte-compile-form form for-effect)
  (setq for-effect nil))

(byte-defop-compiler-1 inline byte-compile-progn)
(byte-defop-compiler-1 progn)
(byte-defop-compiler-1 prog1)
(byte-defop-compiler-1 prog2)
(byte-defop-compiler-1 if)
(byte-defop-compiler-1 cond)
(byte-defop-compiler-1 and)
(byte-defop-compiler-1 or)
(byte-defop-compiler-1 while)
(byte-defop-compiler-1 funcall)
(byte-defop-compiler-1 let)
(byte-defop-compiler-1 let* byte-compile-let)

(defun byte-compile-progn (form)
  (byte-compile-body-do-effect (cdr form)))

(defun byte-compile-prog1 (form)
  (byte-compile-form-do-effect (car (cdr form)))
  (byte-compile-body (cdr (cdr form)) t))

(defun byte-compile-prog2 (form)
  (byte-compile-form (nth 1 form) t)
  (byte-compile-form-do-effect (nth 2 form))
  (byte-compile-body (cdr (cdr (cdr form))) t))

(defmacro byte-compile-goto-if (cond discard tag)
  `(byte-compile-goto
    (if ,cond
        (if ,discard 'byte-goto-if-not-nil 'byte-goto-if-not-nil-else-pop)
      (if ,discard 'byte-goto-if-nil 'byte-goto-if-nil-else-pop))
    ,tag))

;; Return the list of items in CONDITION-PARAM that match PRED-LIST.
;; Only return items that are not in ONLY-IF-NOT-PRESENT.
(defun byte-compile-find-bound-condition (condition-param
                                          pred-list
                                          &optional only-if-not-present)
  (let ((result nil)
        (nth-one nil)
        (cond-list
         (if (memq (car-safe condition-param) pred-list)
             ;; The condition appears by itself.
             (list condition-param)
           ;; If the condition is an `and', look for matches among the
           ;; `and' arguments.
           (when (eq 'and (car-safe condition-param))
             (cdr condition-param)))))

    (dolist (crt cond-list)
      (when (and (memq (car-safe crt) pred-list)
                 (eq 'quote (car-safe (setq nth-one (nth 1 crt))))
                 ;; Ignore if the symbol is already on the unresolved
                 ;; list.
                 (not (assq (nth 1 nth-one) ; the relevant symbol
                            only-if-not-present)))
        (push (nth 1 (nth 1 crt)) result)))
    result))

(defmacro byte-compile-maybe-guarded (condition &rest body)
  "Execute forms in BODY, potentially guarded by CONDITION.
CONDITION is a variable whose value is a test in an `if' or `cond'.
BODY is the code to compile in the first arm of the if or the body of
the cond clause.  If CONDITION's value is of the form (fboundp 'foo)
or (boundp 'foo), the relevant warnings from BODY about foo's
being undefined (or obsolete) will be suppressed.

If CONDITION's value is (not (featurep 'emacs)) or (featurep 'xemacs),
that suppresses all warnings during execution of BODY."
  (declare (indent 1) (debug t))
  `(let* ((fbound-list (byte-compile-find-bound-condition
                        ,condition (list 'fboundp)
                        byte-compile-unresolved-functions))
          (bound-list (byte-compile-find-bound-condition
                       ,condition (list 'boundp 'default-boundp)))
          ;; Maybe add to the bound list.
          (byte-compile-bound-variables
           (append bound-list byte-compile-bound-variables)))
     (unwind-protect
         ;; If things not being bound at all is ok, so must them being obsolete.
         ;; Note that we add to the existing lists since Tramp (ab)uses
         ;; this feature.
         (let ((byte-compile-not-obsolete-vars
                (append byte-compile-not-obsolete-vars bound-list))
               (byte-compile-not-obsolete-funcs
                (append byte-compile-not-obsolete-funcs fbound-list)))
           ,@body)
       ;; Maybe remove the function symbol from the unresolved list.
       (dolist (fbound fbound-list)
         (when fbound
           (setq byte-compile-unresolved-functions
                 (delq (assq fbound byte-compile-unresolved-functions)
                       byte-compile-unresolved-functions)))))))

(defun byte-compile-if (form)
  (byte-compile-form (car (cdr form)))
  ;; Check whether we have `(if (fboundp ...' or `(if (boundp ...'
  ;; and avoid warnings about the relevent symbols in the consequent.
  (let ((clause (nth 1 form))
        (donetag (byte-compile-make-tag)))
    (if (null (nthcdr 3 form))
        ;; No else-forms
        (progn
          (byte-compile-goto-if nil for-effect donetag)
          (byte-compile-maybe-guarded clause
            (byte-compile-form (nth 2 form) for-effect))
          (byte-compile-out-tag donetag))
      (let ((elsetag (byte-compile-make-tag)))
        (byte-compile-goto 'byte-goto-if-nil elsetag)
        (byte-compile-maybe-guarded clause
          (byte-compile-form (nth 2 form) for-effect))
        (byte-compile-goto 'byte-goto donetag)
        (byte-compile-out-tag elsetag)
        (byte-compile-maybe-guarded (list 'not clause)
          (byte-compile-body (cdr (cdr (cdr form))) for-effect))
        (byte-compile-out-tag donetag))))
  (setq for-effect nil))

(defun byte-compile-cond (clauses)
  (let ((donetag (byte-compile-make-tag))
        nexttag clause)
    (while (setq clauses (cdr clauses))
      (setq clause (car clauses))
      (cond ((or (eq (car clause) t)
                 (and (eq (car-safe (car clause)) 'quote)
                      (car-safe (cdr-safe (car clause)))))
             ;; Unconditional clause
             (setq clause (cons t clause)
                   clauses nil))
            ((cdr clauses)
             (byte-compile-form (car clause))
             (if (null (cdr clause))
                 ;; First clause is a singleton.
                 (byte-compile-goto-if t for-effect donetag)
               (setq nexttag (byte-compile-make-tag))
               (byte-compile-goto 'byte-goto-if-nil nexttag)
               (byte-compile-maybe-guarded (car clause)
                 (byte-compile-body (cdr clause) for-effect))
               (byte-compile-goto 'byte-goto donetag)
               (byte-compile-out-tag nexttag)))))
    ;; Last clause
    (let ((guard (car clause)))
      (and (cdr clause) (not (eq guard t))
           (progn (byte-compile-form guard)
                  (byte-compile-goto-if nil for-effect donetag)
                  (setq clause (cdr clause))))
      (byte-compile-maybe-guarded guard
        (byte-compile-body-do-effect clause)))
    (byte-compile-out-tag donetag)))

(defun byte-compile-and (form)
  (let ((failtag (byte-compile-make-tag))
        (bytecomp-args (cdr form)))
    (if (null bytecomp-args)
        (byte-compile-form-do-effect t)
      (byte-compile-and-recursion bytecomp-args failtag))))

;; Handle compilation of a nontrivial `and' call.
;; We use tail recursion so we can use byte-compile-maybe-guarded.
(defun byte-compile-and-recursion (rest failtag)
  (if (cdr rest)
      (progn
        (byte-compile-form (car rest))
        (byte-compile-goto-if nil for-effect failtag)
        (byte-compile-maybe-guarded (car rest)
          (byte-compile-and-recursion (cdr rest) failtag)))
    (byte-compile-form-do-effect (car rest))
    (byte-compile-out-tag failtag)))

(defun byte-compile-or (form)
  (let ((wintag (byte-compile-make-tag))
        (bytecomp-args (cdr form)))
    (if (null bytecomp-args)
        (byte-compile-form-do-effect nil)
      (byte-compile-or-recursion bytecomp-args wintag))))

;; Handle compilation of a nontrivial `or' call.
;; We use tail recursion so we can use byte-compile-maybe-guarded.
(defun byte-compile-or-recursion (rest wintag)
  (if (cdr rest)
      (progn
        (byte-compile-form (car rest))
        (byte-compile-goto-if t for-effect wintag)
        (byte-compile-maybe-guarded (list 'not (car rest))
          (byte-compile-or-recursion (cdr rest) wintag)))
    (byte-compile-form-do-effect (car rest))
    (byte-compile-out-tag wintag)))

(defun byte-compile-while (form)
  (let ((endtag (byte-compile-make-tag))
        (looptag (byte-compile-make-tag)))
    (byte-compile-out-tag looptag)
    (byte-compile-form (car (cdr form)))
    (byte-compile-goto-if nil for-effect endtag)
    (byte-compile-body (cdr (cdr form)) t)
    (byte-compile-goto 'byte-goto looptag)
    (byte-compile-out-tag endtag)
    (setq for-effect nil)))

(defun byte-compile-funcall (form)
  (mapc 'byte-compile-form (cdr form))
  (byte-compile-out 'byte-call (length (cdr (cdr form)))))

\f
;; let binding

(defun byte-compile-push-binding-init (clause)
  "Emit byte-codes to push the initialization value for CLAUSE on the stack.
Return the offset in the form (VAR . OFFSET)."
  (let* ((var (if (consp clause) (car clause) clause)))
    ;; We record the stack position even of dynamic bindings and
    ;; variables in non-stack lexical environments; we'll put
    ;; them in the proper place below.
    (prog1 (cons var byte-compile-depth)
      (if (consp clause)
          (byte-compile-form (cadr clause))
        (byte-compile-push-constant nil)))))

(defun byte-compile-not-lexical-var-p (var)
  (or (not (symbolp var))
      (special-variable-p var)
      (memq var byte-compile-bound-variables)
      (memq var '(nil t))
      (keywordp var)))

(defun byte-compile-bind (var init-lexenv)
  "Emit byte-codes to bind VAR and update `byte-compile-lexical-environment'.
INIT-LEXENV should be a lexical-environment alist describing the
positions of the init value that have been pushed on the stack.
Return non-nil if the TOS value was popped."
  ;; The presence of lexical bindings mean that we may have to
  ;; juggle things on the stack, to move them to TOS for
  ;; dynamic binding.
  (cond ((not (byte-compile-not-lexical-var-p var))
         ;; VAR is a simple stack-allocated lexical variable
         (push (assq var init-lexenv)
               byte-compile-lexical-environment)
         nil)
        ((eq var (caar init-lexenv))
         ;; VAR is dynamic and is on the top of the
         ;; stack, so we can just bind it like usual
         (byte-compile-dynamic-variable-bind var)
         t)
        (t
         ;; VAR is dynamic, but we have to get its
         ;; value out of the middle of the stack
         (let ((stack-pos (cdr (assq var init-lexenv))))
           (byte-compile-stack-ref stack-pos)
           (byte-compile-dynamic-variable-bind var)
           ;; Now we have to store nil into its temporary
           ;; stack position to avoid problems with GC
           (byte-compile-push-constant nil)
           (byte-compile-stack-set stack-pos))
         nil)))

(defun byte-compile-unbind (clauses init-lexenv
                                    &optional preserve-body-value)
  "Emit byte-codes to unbind the variables bound by CLAUSES.
CLAUSES is a `let'-style variable binding list.  INIT-LEXENV should be a
lexical-environment alist describing the positions of the init value that
have been pushed on the stack.  If PRESERVE-BODY-VALUE is true,
then an additional value on the top of the stack, above any lexical binding
slots, is preserved, so it will be on the top of the stack after all
binding slots have been popped."
  ;; Unbind dynamic variables
  (let ((num-dynamic-bindings 0))
    (dolist (clause clauses)
      (unless (assq (if (consp clause) (car clause) clause)
                    byte-compile-lexical-environment)
        (setq num-dynamic-bindings (1+ num-dynamic-bindings))))
    (unless (zerop num-dynamic-bindings)
      (byte-compile-out 'byte-unbind num-dynamic-bindings)))
  ;; Pop lexical variables off the stack, possibly preserving the
  ;; return value of the body.
  (when init-lexenv
    ;; INIT-LEXENV contains all init values left on the stack
    (byte-compile-discard (length init-lexenv) preserve-body-value)))

(defun byte-compile-let (form)
  "Generate code for the `let' form FORM."
  (let ((clauses (cadr form))
        (init-lexenv nil))
    (when (eq (car form) 'let)
      ;; First compute the binding values in the old scope.
      (dolist (var clauses)
        (push (byte-compile-push-binding-init var) init-lexenv)))
    ;; New scope.
    (let ((byte-compile-bound-variables byte-compile-bound-variables)
          (byte-compile-lexical-environment byte-compile-lexical-environment))
      ;; Bind the variables.
      ;; For `let', do it in reverse order, because it makes no
      ;; semantic difference, but it is a lot more efficient since the
      ;; values are now in reverse order on the stack.
      (dolist (var (if (eq (car form) 'let) (reverse clauses) clauses))
        (unless (eq (car form) 'let)
          (push (byte-compile-push-binding-init var) init-lexenv))
        (let ((var (if (consp var) (car var) var)))
          (cond ((null lexical-binding)
                 ;; If there are no lexical bindings, we can do things simply.
                 (byte-compile-dynamic-variable-bind var))
                ((byte-compile-bind var init-lexenv)
                 (pop init-lexenv)))))
      ;; Emit the body.
      (let ((init-stack-depth byte-compile-depth))
        (byte-compile-body-do-effect (cdr (cdr form)))
        ;; Unbind the variables.
        (if lexical-binding
            ;; Unbind both lexical and dynamic variables.
            (progn
              (assert (or (eq byte-compile-depth init-stack-depth)
                          (eq byte-compile-depth (1+ init-stack-depth))))
              (byte-compile-unbind clauses init-lexenv (> byte-compile-depth
                                                          init-stack-depth)))
          ;; Unbind dynamic variables.
          (byte-compile-out 'byte-unbind (length clauses)))))))

\f

(byte-defop-compiler-1 /= byte-compile-negated)
(byte-defop-compiler-1 atom byte-compile-negated)
(byte-defop-compiler-1 nlistp byte-compile-negated)

(put '/= 'byte-compile-negated-op '=)
(put 'atom 'byte-compile-negated-op 'consp)
(put 'nlistp 'byte-compile-negated-op 'listp)

(defun byte-compile-negated (form)
  (byte-compile-form-do-effect (byte-compile-negation-optimizer form)))

;; Even when optimization is off, /= is optimized to (not (= ...)).
(defun byte-compile-negation-optimizer (form)
  ;; an optimizer for forms where <form1> is less efficient than (not <form2>)
  (byte-compile-set-symbol-position (car form))
  (list 'not
    (cons (or (get (car form) 'byte-compile-negated-op)
              (error
               "Compiler error: `%s' has no `byte-compile-negated-op' property"
               (car form)))
          (cdr form))))

\f
;;; other tricky macro-like special-forms

(byte-defop-compiler-1 catch)
(byte-defop-compiler-1 unwind-protect)
(byte-defop-compiler-1 condition-case)
(byte-defop-compiler-1 save-excursion)
(byte-defop-compiler-1 save-current-buffer)
(byte-defop-compiler-1 save-restriction)
(byte-defop-compiler-1 track-mouse)

(defun byte-compile-catch (form)
  (byte-compile-form (car (cdr form)))
  (pcase (cddr form)
    (`(:fun-body ,f)
     (byte-compile-form `(list 'funcall ,f)))
    (body
     (byte-compile-push-constant
      (byte-compile-top-level (cons 'progn body) for-effect))))
  (byte-compile-out 'byte-catch 0))

(defun byte-compile-unwind-protect (form)
  (pcase (cddr form)
    (`(:fun-body ,f)
     (byte-compile-form `(list (list 'funcall ,f))))
    (handlers
     (byte-compile-push-constant
      (byte-compile-top-level-body handlers t))))
  (byte-compile-out 'byte-unwind-protect 0)
  (byte-compile-form-do-effect (car (cdr form)))
  (byte-compile-out 'byte-unbind 1))

(defun byte-compile-track-mouse (form)
  (byte-compile-form
   (pcase form
     (`(,_ :fun-body ,f) `(eval (list 'track-mouse (list 'funcall ,f))))
     (_ `(eval '(track-mouse ,@(byte-compile-top-level-body (cdr form))))))))

(defun byte-compile-condition-case (form)
  (let* ((var (nth 1 form))
         (fun-bodies (eq var :fun-body))
         (byte-compile-bound-variables
          (if (and var (not fun-bodies))
              (cons var byte-compile-bound-variables)
            byte-compile-bound-variables)))
    (byte-compile-set-symbol-position 'condition-case)
    (unless (symbolp var)
      (byte-compile-warn
       "`%s' is not a variable-name or nil (in condition-case)" var))
    (if fun-bodies (setq var (make-symbol "err")))
    (byte-compile-push-constant var)
    (if fun-bodies
        (byte-compile-form `(list 'funcall ,(nth 2 form)))
      (byte-compile-push-constant
       (byte-compile-top-level (nth 2 form) for-effect)))
    (let ((compiled-clauses
           (mapcar
            (lambda (clause)
              (let ((condition (car clause)))
                (cond ((not (or (symbolp condition)
                                (and (listp condition)
                                     (let ((ok t))
                                       (dolist (sym condition)
                                         (if (not (symbolp sym))
                                             (setq ok nil)))
                                       ok))))
                       (byte-compile-warn
                        "`%S' is not a condition name or list of such (in condition-case)"
                        condition))
                      ;; (not (or (eq condition 't)
                      ;;         (and (stringp (get condition 'error-message))
                      ;;              (consp (get condition
                      ;;                          'error-conditions)))))
                      ;; (byte-compile-warn
                      ;;   "`%s' is not a known condition name
                      ;;   (in condition-case)"
                      ;;   condition))
                      )
                (if fun-bodies
                    `(list ',condition (list 'funcall ,(cadr clause) ',var))
                  (cons condition
                        (byte-compile-top-level-body
                         (cdr clause) for-effect)))))
            (cdr (cdr (cdr form))))))
      (if fun-bodies
          (byte-compile-form `(list ,@compiled-clauses))
        (byte-compile-push-constant compiled-clauses)))
    (byte-compile-out 'byte-condition-case 0)))


(defun byte-compile-save-excursion (form)
  (if (and (eq 'set-buffer (car-safe (car-safe (cdr form))))
           (byte-compile-warning-enabled-p 'suspicious))
      (byte-compile-warn "`save-excursion' defeated by `set-buffer'"))
  (byte-compile-out 'byte-save-excursion 0)
  (byte-compile-body-do-effect (cdr form))
  (byte-compile-out 'byte-unbind 1))

(defun byte-compile-save-restriction (form)
  (byte-compile-out 'byte-save-restriction 0)
  (byte-compile-body-do-effect (cdr form))
  (byte-compile-out 'byte-unbind 1))

(defun byte-compile-save-current-buffer (form)
  (byte-compile-out 'byte-save-current-buffer 0)
  (byte-compile-body-do-effect (cdr form))
  (byte-compile-out 'byte-unbind 1))
\f
;;; top-level forms elsewhere

(byte-defop-compiler-1 defun)
(byte-defop-compiler-1 defmacro)
(byte-defop-compiler-1 defvar)
(byte-defop-compiler-1 defconst byte-compile-defvar)
(byte-defop-compiler-1 autoload)
(byte-defop-compiler-1 lambda byte-compile-lambda-form)

(defun byte-compile-defun (form)
  ;; This is not used for file-level defuns with doc strings.
  (if (symbolp (car form))
      (byte-compile-set-symbol-position (car form))
    (byte-compile-set-symbol-position 'defun)
    (error "defun name must be a symbol, not %s" (car form)))
  (let ((for-effect nil))
    (byte-compile-push-constant 'defalias)
    (byte-compile-push-constant (nth 1 form))
    (byte-compile-closure (cdr (cdr form)) t))
  (byte-compile-out 'byte-call 2))

(defun byte-compile-defmacro (form)
  ;; This is not used for file-level defmacros with doc strings.
  (byte-compile-body-do-effect
   (let ((decls (byte-compile-defmacro-declaration form))
         (code (byte-compile-byte-code-maker
                (byte-compile-lambda (cdr (cdr form)) t))))
     `((defalias ',(nth 1 form)
         ,(if (eq (car-safe code) 'make-byte-code)
              `(cons 'macro ,code)
            `'(macro . ,(eval code))))
       ,@decls
       ',(nth 1 form)))))

(defun byte-compile-defvar (form)
  ;; This is not used for file-level defvar/consts with doc strings.
  (when (and (symbolp (nth 1 form))
             (not (string-match "[-*/:$]" (symbol-name (nth 1 form))))
             (byte-compile-warning-enabled-p 'lexical))
    (byte-compile-warn "global/dynamic var `%s' lacks a prefix"
                       (nth 1 form)))
  (let ((fun (nth 0 form))
        (var (nth 1 form))
        (value (nth 2 form))
        (string (nth 3 form)))
    (byte-compile-set-symbol-position fun)
    (when (or (> (length form) 4)
              (and (eq fun 'defconst) (null (cddr form))))
      (let ((ncall (length (cdr form))))
        (byte-compile-warn
         "`%s' called with %d argument%s, but %s %s"
         fun ncall
         (if (= 1 ncall) "" "s")
         (if (< ncall 2) "requires" "accepts only")
         "2-3")))
    (push var byte-compile-bound-variables)
    (if (eq fun 'defconst)
        (push var byte-compile-const-variables))
    (byte-compile-body-do-effect
     (list
      ;; Put the defined variable in this library's load-history entry
      ;; just as a real defvar would, but only in top-level forms.
      (when (and (cddr form) (null byte-compile-current-form))
        `(setq current-load-list (cons ',var current-load-list)))
      (when (> (length form) 3)
        (when (and string (not (stringp string)))
            (byte-compile-warn "third arg to `%s %s' is not a string: %s"
                               fun var string))
        `(put ',var 'variable-documentation ,string))
      (if (cddr form)           ; `value' provided
          (let ((byte-compile-not-obsolete-vars (list var)))
            (if (eq fun 'defconst)
                ;; `defconst' sets `var' unconditionally.
                (let ((tmp (make-symbol "defconst-tmp-var")))
                  `(funcall '(lambda (,tmp) (defconst ,var ,tmp))
                            ,value))
              ;; `defvar' sets `var' only when unbound.
              `(if (not (default-boundp ',var)) (setq-default ,var ,value))))
        (when (eq fun 'defconst)
          ;; This will signal an appropriate error at runtime.
          `(eval ',form)))
      `',var))))

(defun byte-compile-autoload (form)
  (byte-compile-set-symbol-position 'autoload)
  (and (byte-compile-constp (nth 1 form))
       (byte-compile-constp (nth 5 form))
       (eval (nth 5 form))  ; macro-p
       (not (fboundp (eval (nth 1 form))))
       (byte-compile-warn
        "The compiler ignores `autoload' except at top level.  You should
     probably put the autoload of the macro `%s' at top-level."
        (eval (nth 1 form))))
  (byte-compile-normal-call form))

;; Lambdas in valid places are handled as special cases by various code.
;; The ones that remain are errors.
(defun byte-compile-lambda-form (form)
  (byte-compile-set-symbol-position 'lambda)
  (error "`lambda' used as function name is invalid"))

;; Compile normally, but deal with warnings for the function being defined.
(put 'defalias 'byte-hunk-handler 'byte-compile-file-form-defalias)
(defun byte-compile-file-form-defalias (form)
  (if (and (consp (cdr form)) (consp (nth 1 form))
           (eq (car (nth 1 form)) 'quote)
           (consp (cdr (nth 1 form)))
           (symbolp (nth 1 (nth 1 form))))
      (let ((constant
             (and (consp (nthcdr 2 form))
                  (consp (nth 2 form))
                  (eq (car (nth 2 form)) 'quote)
                  (consp (cdr (nth 2 form)))
                  (symbolp (nth 1 (nth 2 form))))))
        (byte-compile-defalias-warn (nth 1 (nth 1 form)))
        (push (cons (nth 1 (nth 1 form))
                    (if constant (nth 1 (nth 2 form)) t))
              byte-compile-function-environment)))
  ;; We used to just do: (byte-compile-normal-call form)
  ;; But it turns out that this fails to optimize the code.
  ;; So instead we now do the same as what other byte-hunk-handlers do,
  ;; which is to call back byte-compile-file-form and then return nil.
  ;; Except that we can't just call byte-compile-file-form since it would
  ;; call us right back.
  (byte-compile-keep-pending form)
  ;; Return nil so the form is not output twice.
  nil)

;; Turn off warnings about prior calls to the function being defalias'd.
;; This could be smarter and compare those calls with
;; the function it is being aliased to.
(defun byte-compile-defalias-warn (new)
  (let ((calls (assq new byte-compile-unresolved-functions)))
    (if calls
        (setq byte-compile-unresolved-functions
              (delq calls byte-compile-unresolved-functions)))))

(byte-defop-compiler-1 with-no-warnings byte-compile-no-warnings)
(defun byte-compile-no-warnings (form)
  (let (byte-compile-warnings)
    (byte-compile-form (cons 'progn (cdr form)))))

;; Warn about misuses of make-variable-buffer-local.
(byte-defop-compiler-1 make-variable-buffer-local
                       byte-compile-make-variable-buffer-local)
(defun byte-compile-make-variable-buffer-local (form)
  (if (and (eq (car-safe (car-safe (cdr-safe form))) 'quote)
           (byte-compile-warning-enabled-p 'make-local))
      (byte-compile-warn
       "`make-variable-buffer-local' should be called at toplevel"))
  (byte-compile-normal-call form))
(put 'make-variable-buffer-local
     'byte-hunk-handler 'byte-compile-form-make-variable-buffer-local)
(defun byte-compile-form-make-variable-buffer-local (form)
  (byte-compile-keep-pending form 'byte-compile-normal-call))

\f
;;; tags

;; Note: Most operations will strip off the 'TAG, but it speeds up
;; optimization to have the 'TAG as a part of the tag.
;; Tags will be (TAG . (tag-number . stack-depth)).
(defun byte-compile-make-tag ()
  (list 'TAG (setq byte-compile-tag-number (1+ byte-compile-tag-number))))


(defun byte-compile-out-tag (tag)
  (setq byte-compile-output (cons tag byte-compile-output))
  (if (cdr (cdr tag))
      (progn
        ;; ## remove this someday
        (and byte-compile-depth
             (not (= (cdr (cdr tag)) byte-compile-depth))
             (error "Compiler bug: depth conflict at tag %d" (car (cdr tag))))
        (setq byte-compile-depth (cdr (cdr tag))))
    (setcdr (cdr tag) byte-compile-depth)))

(defun byte-compile-goto (opcode tag)
  (push (cons opcode tag) byte-compile-output)
  (setcdr (cdr tag) (if (memq opcode byte-goto-always-pop-ops)
                        (1- byte-compile-depth)
                      byte-compile-depth))
  (setq byte-compile-depth (and (not (eq opcode 'byte-goto))
                                (1- byte-compile-depth))))

(defun byte-compile-stack-adjustment (op operand)
  "Return the amount by which an operation adjusts the stack.
OP and OPERAND are as passed to `byte-compile-out'."
  (if (memq op '(byte-call byte-discardN byte-discardN-preserve-tos))
      ;; For calls, OPERAND is the number of args, so we pop OPERAND + 1
      ;; elements, and the push the result, for a total of -OPERAND.
      ;; For discardN*, of course, we just pop OPERAND elements.
      (- operand)
    (or (aref byte-stack+-info (symbol-value op))
        ;; Ops with a nil entry in `byte-stack+-info' are byte-codes
        ;; that take OPERAND values off the stack and push a result, for
        ;; a total of 1 - OPERAND
        (- 1 operand))))
  
(defun byte-compile-out (op &optional operand)
  (push (cons op operand) byte-compile-output)
  (if (eq op 'byte-return)
      ;; This is actually an unnecessary case, because there should be no
      ;; more ops behind byte-return.
      (setq byte-compile-depth nil)
    (setq byte-compile-depth
          (+ byte-compile-depth (byte-compile-stack-adjustment op operand)))
    (setq byte-compile-maxdepth (max byte-compile-depth byte-compile-maxdepth))
    ;;(if (< byte-compile-depth 0) (error "Compiler error: stack underflow"))
    ))

(defun byte-compile-delay-out (&optional stack-used stack-adjust)
  "Add a placeholder to the output, which can be used to later add byte-codes.
Return a position tag that can be passed to `byte-compile-delayed-out'
to add the delayed byte-codes.  STACK-USED is the maximum amount of
stack-spaced used by the delayed byte-codes (defaulting to 0), and
STACK-ADJUST is the amount by which the later-added code will adjust the
stack (defaulting to 0); the byte-codes added later _must_ adjust the
stack by this amount!  If STACK-ADJUST is 0, then it's not necessary to
actually add anything later; the effect as if nothing was added at all."
  ;; We just add a no-op to `byte-compile-output', and return a pointer to
  ;; the tail of the list; `byte-compile-delayed-out' uses list surgery
  ;; to add the byte-codes.
  (when stack-used
    (setq byte-compile-maxdepth
          (max byte-compile-depth (+ byte-compile-depth (or stack-used 0)))))
  (when stack-adjust
    (setq byte-compile-depth
          (+ byte-compile-depth stack-adjust)))
  (push (cons nil (or stack-adjust 0)) byte-compile-output))

(defun byte-compile-delayed-out (position op &optional operand)
  "Add at POSITION the byte-operation OP, with optional numeric arg OPERAND.
POSITION should a position returned by `byte-compile-delay-out'.
Return a new position, which can be used to add further operations."
  (unless (null (caar position))
    (error "Bad POSITION arg to `byte-compile-delayed-out'"))
  ;; This is kind of like `byte-compile-out', but we splice into the list
  ;; where POSITION is.  We don't bother updating `byte-compile-maxdepth'
  ;; because that was already done by `byte-compile-delay-out', but we do
  ;; update the relative operand stored in the no-op marker currently at
  ;; POSITION; since we insert before that marker, this means that if the
  ;; caller doesn't insert a sequence of byte-codes that matches the expected
  ;; operand passed to `byte-compile-delay-out', then the nop will still have
  ;; a non-zero operand when `byte-compile-lapcode' is called, which will
  ;; cause an error to be signaled.

  ;; Adjust the cumulative stack-adjustment stored in the cdr of the no-op
  (setcdr (car position)
          (- (cdar position) (byte-compile-stack-adjustment op operand)))
  ;; Add the new operation onto the list tail at POSITION
  (setcdr position (cons (cons op operand) (cdr position)))
  position)

\f
;;; call tree stuff

(defun byte-compile-annotate-call-tree (form)
  (let (entry)
    ;; annotate the current call
    (if (setq entry (assq (car form) byte-compile-call-tree))
        (or (memq byte-compile-current-form (nth 1 entry)) ;callers
            (setcar (cdr entry)
                    (cons byte-compile-current-form (nth 1 entry))))
      (setq byte-compile-call-tree
            (cons (list (car form) (list byte-compile-current-form) nil)
                  byte-compile-call-tree)))
    ;; annotate the current function
    (if (setq entry (assq byte-compile-current-form byte-compile-call-tree))
        (or (memq (car form) (nth 2 entry)) ;called
            (setcar (cdr (cdr entry))
                    (cons (car form) (nth 2 entry))))
      (setq byte-compile-call-tree
            (cons (list byte-compile-current-form nil (list (car form)))
                  byte-compile-call-tree)))
    ))

;; Renamed from byte-compile-report-call-tree
;; to avoid interfering with completion of byte-compile-file.
;;;###autoload
(defun display-call-tree (&optional filename)
  "Display a call graph of a specified file.
This lists which functions have been called, what functions called
them, and what functions they call.  The list includes all functions
whose definitions have been compiled in this Emacs session, as well as
all functions called by those functions.

The call graph does not include macros, inline functions, or
primitives that the byte-code interpreter knows about directly \(eq,
cons, etc.\).

The call tree also lists those functions which are not known to be called
\(that is, to which no calls have been compiled\), and which cannot be
invoked interactively."
  (interactive)
  (message "Generating call tree...")
  (with-output-to-temp-buffer "*Call-Tree*"
    (set-buffer "*Call-Tree*")
    (erase-buffer)
    (message "Generating call tree... (sorting on %s)"
             byte-compile-call-tree-sort)
    (insert "Call tree for "
            (cond ((null byte-compile-current-file) (or filename "???"))
                  ((stringp byte-compile-current-file)
                   byte-compile-current-file)
                  (t (buffer-name byte-compile-current-file)))
            " sorted on "
            (prin1-to-string byte-compile-call-tree-sort)
            ":\n\n")
    (if byte-compile-call-tree-sort
        (setq byte-compile-call-tree
              (sort byte-compile-call-tree
                    (cond ((eq byte-compile-call-tree-sort 'callers)
                           (function (lambda (x y) (< (length (nth 1 x))
                                                      (length (nth 1 y))))))
                          ((eq byte-compile-call-tree-sort 'calls)
                           (function (lambda (x y) (< (length (nth 2 x))
                                                      (length (nth 2 y))))))
                          ((eq byte-compile-call-tree-sort 'calls+callers)
                           (function (lambda (x y) (< (+ (length (nth 1 x))
                                                         (length (nth 2 x)))
                                                      (+ (length (nth 1 y))
                                                         (length (nth 2 y)))))))
                          ((eq byte-compile-call-tree-sort 'name)
                           (function (lambda (x y) (string< (car x)
                                                            (car y)))))
                          (t (error "`byte-compile-call-tree-sort': `%s' - unknown sort mode"
                                    byte-compile-call-tree-sort))))))
    (message "Generating call tree...")
    (let ((rest byte-compile-call-tree)
          (b (current-buffer))
          f p
          callers calls)
      (while rest
        (prin1 (car (car rest)) b)
        (setq callers (nth 1 (car rest))
              calls (nth 2 (car rest)))
        (insert "\t"
          (cond ((not (fboundp (setq f (car (car rest)))))
                 (if (null f)
                     " <top level>";; shouldn't insert nil then, actually -sk
                   " <not defined>"))
                ((subrp (setq f (symbol-function f)))
                 " <subr>")
                ((symbolp f)
                 (format " ==> %s" f))
                ((byte-code-function-p f)
                 "<compiled function>")
                ((not (consp f))
                 "<malformed function>")
                ((eq 'macro (car f))
                 (if (or (byte-code-function-p (cdr f))
                         (assq 'byte-code (cdr (cdr (cdr f)))))
                     " <compiled macro>"
                   " <macro>"))
                ((assq 'byte-code (cdr (cdr f)))
                 "<compiled lambda>")
                ((eq 'lambda (car f))
                 "<function>")
                (t "???"))
          (format " (%d callers + %d calls = %d)"
                  ;; Does the optimizer eliminate common subexpressions?-sk
                  (length callers)
                  (length calls)
                  (+ (length callers) (length calls)))
          "\n")
        (if callers
            (progn
              (insert "  called by:\n")
              (setq p (point))
              (insert "    " (if (car callers)
                                 (mapconcat 'symbol-name callers ", ")
                               "<top level>"))
              (let ((fill-prefix "    "))
                (fill-region-as-paragraph p (point)))
              (unless (= 0 (current-column))
                (insert "\n"))))
        (if calls
            (progn
              (insert "  calls:\n")
              (setq p (point))
              (insert "    " (mapconcat 'symbol-name calls ", "))
              (let ((fill-prefix "    "))
                (fill-region-as-paragraph p (point)))
              (unless (= 0 (current-column))
                (insert "\n"))))
        (setq rest (cdr rest)))

      (message "Generating call tree...(finding uncalled functions...)")
      (setq rest byte-compile-call-tree)
      (let (uncalled def)
        (while rest
          (or (nth 1 (car rest))
              (null (setq f (caar rest)))
              (progn
                (setq def (byte-compile-fdefinition f t))
                (and (eq (car-safe def) 'macro)
                     (eq (car-safe (cdr-safe def)) 'lambda)
                     (setq def (cdr def)))
                (functionp def))
              (progn
                (setq def (byte-compile-fdefinition f nil))
                (and (eq (car-safe def) 'macro)
                     (eq (car-safe (cdr-safe def)) 'lambda)
                     (setq def (cdr def)))
                (commandp def))
              (setq uncalled (cons f uncalled)))
          (setq rest (cdr rest)))
        (if uncalled
            (let ((fill-prefix "  "))
              (insert "Noninteractive functions not known to be called:\n  ")
              (setq p (point))
              (insert (mapconcat 'symbol-name (nreverse uncalled) ", "))
              (fill-region-as-paragraph p (point))))))
    (message "Generating call tree...done.")))

\f
;;;###autoload
(defun batch-byte-compile-if-not-done ()
  "Like `byte-compile-file' but doesn't recompile if already up to date.
Use this from the command line, with `-batch';
it won't work in an interactive Emacs."
  (batch-byte-compile t))

;;; by crl@newton.purdue.edu
;;;  Only works noninteractively.
;;;###autoload
(defun batch-byte-compile (&optional noforce)
  "Run `byte-compile-file' on the files remaining on the command line.
Use this from the command line, with `-batch';
it won't work in an interactive Emacs.
Each file is processed even if an error occurred previously.
For example, invoke \"emacs -batch -f batch-byte-compile $emacs/ ~/*.el\".
If NOFORCE is non-nil, don't recompile a file that seems to be
already up-to-date."
  ;; command-line-args-left is what is left of the command line (from startup.el)
  (defvar command-line-args-left)       ;Avoid 'free variable' warning
  (if (not noninteractive)
      (error "`batch-byte-compile' is to be used only with -batch"))
  (let ((bytecomp-error nil))
    (while command-line-args-left
      (if (file-directory-p (expand-file-name (car command-line-args-left)))
          ;; Directory as argument.
          (let ((bytecomp-files (directory-files (car command-line-args-left)))
                bytecomp-source bytecomp-dest)
            (dolist (bytecomp-file bytecomp-files)
              (if (and (string-match emacs-lisp-file-regexp bytecomp-file)
                       (not (auto-save-file-name-p bytecomp-file))
                       (setq bytecomp-source
                             (expand-file-name bytecomp-file
                                               (car command-line-args-left)))
                       (setq bytecomp-dest (byte-compile-dest-file
                                            bytecomp-source))
                       (file-exists-p bytecomp-dest)
                       (file-newer-than-file-p bytecomp-source bytecomp-dest))
                  (if (null (batch-byte-compile-file bytecomp-source))
                      (setq bytecomp-error t)))))
        ;; Specific file argument
        (if (or (not noforce)
                (let* ((bytecomp-source (car command-line-args-left))
                       (bytecomp-dest (byte-compile-dest-file bytecomp-source)))
                  (or (not (file-exists-p bytecomp-dest))
                      (file-newer-than-file-p bytecomp-source bytecomp-dest))))
            (if (null (batch-byte-compile-file (car command-line-args-left)))
                (setq bytecomp-error t))))
      (setq command-line-args-left (cdr command-line-args-left)))
    (kill-emacs (if bytecomp-error 1 0))))

(defun batch-byte-compile-file (bytecomp-file)
  (if debug-on-error
      (byte-compile-file bytecomp-file)
    (condition-case err
        (byte-compile-file bytecomp-file)
      (file-error
       (message (if (cdr err)
                    ">>Error occurred processing %s: %s (%s)"
                  ">>Error occurred processing %s: %s")
                bytecomp-file
                (get (car err) 'error-message)
                (prin1-to-string (cdr err)))
       (let ((bytecomp-destfile (byte-compile-dest-file bytecomp-file)))
         (if (file-exists-p bytecomp-destfile)
             (delete-file bytecomp-destfile)))
       nil)
      (error
       (message (if (cdr err)
                    ">>Error occurred processing %s: %s (%s)"
                  ">>Error occurred processing %s: %s")
                bytecomp-file
                (get (car err) 'error-message)
                (prin1-to-string (cdr err)))
       nil))))

(defun byte-compile-refresh-preloaded ()
  "Reload any Lisp file that was changed since Emacs was dumped.
Use with caution."
  (let* ((argv0 (car command-line-args))
         (emacs-file (executable-find argv0)))
    (if (not (and emacs-file (file-executable-p emacs-file)))
        (message "Can't find %s to refresh preloaded Lisp files" argv0)
      (dolist (f (reverse load-history))
        (setq f (car f))
        (if (string-match "elc\\'" f) (setq f (substring f 0 -1)))
        (when (and (file-readable-p f)
                   (file-newer-than-file-p f emacs-file)
                   ;; Don't reload the source version of the files below
                   ;; because that causes subsequent byte-compilation to
                   ;; be a lot slower and need a higher max-lisp-eval-depth,
                   ;; so it can cause recompilation to fail.
                   (not (member (file-name-nondirectory f)
                                '("pcase.el" "bytecomp.el" "macroexp.el"
                                  "cconv.el" "byte-opt.el"))))
          (message "Reloading stale %s" (file-name-nondirectory f))
          (condition-case nil
              (load f 'noerror nil 'nosuffix)
            ;; Probably shouldn't happen, but in case of an error, it seems
            ;; at least as useful to ignore it as it is to stop compilation.
            (error nil)))))))

;;;###autoload
(defun batch-byte-recompile-directory (&optional arg)
  "Run `byte-recompile-directory' on the dirs remaining on the command line.
Must be used only with `-batch', and kills Emacs on completion.
For example, invoke `emacs -batch -f batch-byte-recompile-directory .'.

Optional argument ARG is passed as second argument ARG to
`byte-recompile-directory'; see there for its possible values
and corresponding effects."
  ;; command-line-args-left is what is left of the command line (startup.el)
  (defvar command-line-args-left)       ;Avoid 'free variable' warning
  (if (not noninteractive)
      (error "batch-byte-recompile-directory is to be used only with -batch"))
  (or command-line-args-left
      (setq command-line-args-left '(".")))
  (while command-line-args-left
    (byte-recompile-directory (car command-line-args-left) arg)
    (setq command-line-args-left (cdr command-line-args-left)))
  (kill-emacs 0))

(provide 'byte-compile)
(provide 'bytecomp)

\f
;;; report metering (see the hacks in bytecode.c)

(defvar byte-code-meter)
(defun byte-compile-report-ops ()
  (or (boundp 'byte-metering-on)
      (error "You must build Emacs with -DBYTE_CODE_METER to use this"))
  (with-output-to-temp-buffer "*Meter*"
    (set-buffer "*Meter*")
    (let ((i 0) n op off)
      (while (< i 256)
        (setq n (aref (aref byte-code-meter 0) i)
              off nil)
        (if t                           ;(not (zerop n))
            (progn
              (setq op i)
              (setq off nil)
              (cond ((< op byte-nth)
                     (setq off (logand op 7))
                     (setq op (logand op 248)))
                    ((>= op byte-constant)
                     (setq off (- op byte-constant)
                           op byte-constant)))
              (setq op (aref byte-code-vector op))
              (insert (format "%-4d" i))
              (insert (symbol-name op))
              (if off (insert " [" (int-to-string off) "]"))
              (indent-to 40)
              (insert (int-to-string n) "\n")))
        (setq i (1+ i))))))
\f
;; To avoid "lisp nesting exceeds max-lisp-eval-depth" when bytecomp compiles
;; itself, compile some of its most used recursive functions (at load time).
;;
(eval-when-compile
  (or (byte-code-function-p (symbol-function 'byte-compile-form))
      (assq 'byte-code (symbol-function 'byte-compile-form))
      (let ((byte-optimize nil)         ; do it fast
            (byte-compile-warnings nil))
        (mapc (lambda (x)
                (or noninteractive (message "compiling %s..." x))
                (byte-compile x)
                (or noninteractive (message "compiling %s...done" x)))
              '(byte-compile-normal-call
                byte-compile-form
                byte-compile-body
                ;; Inserted some more than necessary, to speed it up.
                byte-compile-top-level
                byte-compile-out-toplevel
                byte-compile-constant
                byte-compile-variable-ref))))
  nil)

(run-hooks 'bytecomp-load-hook)

;;; bytecomp.el ends here