/local-lisp/slime/swank-cmucl.lisp

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;;; -*- indent-tabs-mode: nil; outline-regexp: ";;;;+" -*-
;;;
;;; License: Public Domain
;;;
;;;; Introduction
;;;
;;; This is the CMUCL implementation of the `swank-backend' package.

(in-package :swank-backend)

(import-swank-mop-symbols :pcl '(:slot-definition-documentation))

(defun swank-mop:slot-definition-documentation (slot)
  (documentation slot t))

;;;; "Hot fixes"
;;;
;;; Here are necessary bugfixes to the oldest supported version of
;;; CMUCL (currently 18e). Any fixes placed here should also be
;;; submitted to the `cmucl-imp' mailing list and confirmed as
;;; good. When a new release is made that includes the fixes we should
;;; promptly delete them from here. It is enough to be compatible with
;;; the latest release.

(in-package :lisp)

;;; `READ-SEQUENCE' with large sequences has problems in 18e. This new
;;; definition works better.

#+cmu18
(progn
  (let ((s (find-symbol (string :*enable-package-locked-errors*) :lisp)))
    (when s
      (setf (symbol-value s) nil)))

  (defun read-into-simple-string (s stream start end)
    (declare (type simple-string s))
    (declare (type stream stream))
    (declare (type index start end))
    (unless (subtypep (stream-element-type stream) 'character)
      (error 'type-error
             :datum (read-char stream nil #\Null)
             :expected-type (stream-element-type stream)
             :format-control "Trying to read characters from a binary stream."))
    ;; Let's go as low level as it seems reasonable.
    (let* ((numbytes (- end start))
           (total-bytes 0))
      ;; read-n-bytes may return fewer bytes than requested, so we need
      ;; to keep trying.
      (loop while (plusp numbytes) do
            (let ((bytes-read (system:read-n-bytes stream s start numbytes nil)))
              (when (zerop bytes-read)
                (return-from read-into-simple-string total-bytes))
              (incf total-bytes bytes-read)
              (incf start bytes-read)
              (decf numbytes bytes-read)))
      total-bytes))

  (let ((s (find-symbol (string :*enable-package-locked-errors*) :lisp)))
    (when s
      (setf (symbol-value s) t)))

  )

(in-package :swank-backend)


;;;; TCP server
;;;
;;; In CMUCL we support all communication styles. By default we use
;;; `:SIGIO' because it is the most responsive, but it's somewhat
;;; dangerous: CMUCL is not in general "signal safe", and you don't
;;; know for sure what you'll be interrupting. Both `:FD-HANDLER' and
;;; `:SPAWN' are reasonable alternatives.

(defimplementation preferred-communication-style ()
  :sigio)

#-(or darwin mips)
(defimplementation create-socket (host port)
  (let* ((addr (resolve-hostname host))
         (addr (if (not (find-symbol "SOCKET-ERROR" :ext))
                   (ext:htonl addr)
                   addr)))
    (ext:create-inet-listener port :stream :reuse-address t :host addr)))

;; There seems to be a bug in create-inet-listener on Mac/OSX and Irix.
#+(or darwin mips)
(defimplementation create-socket (host port)
  (declare (ignore host))
  (ext:create-inet-listener port :stream :reuse-address t))

(defimplementation local-port (socket)
  (nth-value 1 (ext::get-socket-host-and-port (socket-fd socket))))

(defimplementation close-socket (socket)
  (let ((fd (socket-fd socket)))
    (sys:invalidate-descriptor fd) 
    (ext:close-socket fd)))

(defimplementation accept-connection (socket &key
                                      external-format buffering timeout)
  (declare (ignore timeout))
  (make-socket-io-stream (ext:accept-tcp-connection socket) 
                         (or buffering :full)
                         (or external-format :iso-8859-1)))

;;;;; Sockets

(defimplementation socket-fd (socket)
  "Return the filedescriptor for the socket represented by SOCKET."
  (etypecase socket
    (fixnum socket)
    (sys:fd-stream (sys:fd-stream-fd socket))))

(defun resolve-hostname (hostname)
  "Return the IP address of HOSTNAME as an integer (in host byte-order)."
  (let ((hostent (ext:lookup-host-entry hostname)))
    (car (ext:host-entry-addr-list hostent))))

(defvar *external-format-to-coding-system*
  '((:iso-8859-1
     "latin-1" "latin-1-unix" "iso-latin-1-unix"
     "iso-8859-1" "iso-8859-1-unix")
    #+unicode
    (:utf-8 "utf-8" "utf-8-unix")))

(defimplementation find-external-format (coding-system)
  (car (rassoc-if (lambda (x) (member coding-system x :test #'equal))
                  *external-format-to-coding-system*)))

(defun make-socket-io-stream (fd buffering external-format)
  "Create a new input/output fd-stream for FD."
  #-unicode(declare (ignore external-format))
  (sys:make-fd-stream fd :input t :output t :element-type 'base-char
                      :buffering buffering
                      #+unicode :external-format 
                      #+unicode external-format))

(defimplementation make-fd-stream (fd external-format)
  (make-socket-io-stream fd :full external-format))

(defimplementation dup (fd)
  (multiple-value-bind (clone error) (unix:unix-dup fd)
    (unless clone (error "dup failed: ~a" (unix:get-unix-error-msg error)))
    clone))

(defimplementation command-line-args ()
  ext:*command-line-strings*)

(defimplementation exec-image (image-file args)
  (multiple-value-bind (ok error)
      (unix:unix-execve (car (command-line-args))
			(list* (car (command-line-args)) 
                               "-core" image-file
                               "-noinit"
                               args))
    (error "~a" (unix:get-unix-error-msg error))
    ok))

;;;;; Signal-driven I/O

(defimplementation install-sigint-handler (function)
  (sys:enable-interrupt :sigint (lambda (signal code scp)
                                  (declare (ignore signal code scp))
                                  (funcall function))))

(defvar *sigio-handlers* '()
  "List of (key . function) pairs.
All functions are called on SIGIO, and the key is used for removing
specific functions.")

(defun reset-sigio-handlers () (setq *sigio-handlers* '()))
;; All file handlers are invalid afer reload.
(pushnew 'reset-sigio-handlers ext:*after-save-initializations*)

(defun set-sigio-handler ()
  (sys:enable-interrupt :sigio (lambda (signal code scp)
                                 (sigio-handler signal code scp))))

(defun sigio-handler (signal code scp)
  (declare (ignore signal code scp))
  (mapc #'funcall (mapcar #'cdr *sigio-handlers*)))

(defun fcntl (fd command arg)
  "fcntl(2) - manipulate a file descriptor."
  (multiple-value-bind (ok error) (unix:unix-fcntl fd command arg)
    (cond (ok)
          (t (error "fcntl: ~A" (unix:get-unix-error-msg error))))))

(defimplementation add-sigio-handler (socket fn)
  (set-sigio-handler)
  (let ((fd (socket-fd socket)))
    (fcntl fd unix:f-setown (unix:unix-getpid))
    (let ((old-flags (fcntl fd unix:f-getfl 0)))
      (fcntl fd unix:f-setfl (logior old-flags unix:fasync)))
    (assert (not (assoc fd *sigio-handlers*)))
    (push (cons fd fn) *sigio-handlers*)))

(defimplementation remove-sigio-handlers (socket)
  (let ((fd (socket-fd socket)))
    (when (assoc fd *sigio-handlers*)
      (setf *sigio-handlers* (remove fd *sigio-handlers* :key #'car))
      (let ((old-flags (fcntl fd unix:f-getfl 0)))
        (fcntl fd unix:f-setfl (logandc2 old-flags unix:fasync)))
      (sys:invalidate-descriptor fd))
    (assert (not (assoc fd *sigio-handlers*)))
    (when (null *sigio-handlers*)
      (sys:default-interrupt :sigio))))

;;;;; SERVE-EVENT

(defimplementation add-fd-handler (socket fn)
  (let ((fd (socket-fd socket)))
    (sys:add-fd-handler fd :input (lambda (_) _ (funcall fn)))))

(defimplementation remove-fd-handlers (socket)
  (sys:invalidate-descriptor (socket-fd socket)))

(defimplementation wait-for-input (streams &optional timeout)
  (assert (member timeout '(nil t)))
  (loop
   (let ((ready (remove-if-not #'listen streams)))
     (when ready (return ready)))
   (when timeout (return nil))
   (multiple-value-bind (in out) (make-pipe)
     (let* ((f (constantly t))
            (handlers (loop for s in (cons in (mapcar #'to-fd-stream streams))
                            collect (add-one-shot-handler s f))))
       (unwind-protect
            (let ((*interrupt-queued-handler* (lambda () 
                                                (write-char #\! out))))
              (when (check-slime-interrupts) (return :interrupt))
              (sys:serve-event))
         (mapc #'sys:remove-fd-handler handlers)
         (close in)
         (close out))))))

(defun to-fd-stream (stream)
  (etypecase stream
    (sys:fd-stream stream)
    (synonym-stream 
     (to-fd-stream 
      (symbol-value (synonym-stream-symbol stream))))
    (two-way-stream 
     (to-fd-stream (two-way-stream-input-stream stream)))))
     
(defun add-one-shot-handler (stream function)
  (let (handler)
    (setq handler (sys:add-fd-handler (sys:fd-stream-fd stream) :input
                                      (lambda (fd)
                                        (declare (ignore fd))
                                        (sys:remove-fd-handler handler)
                                        (funcall function stream))))))

(defun make-pipe ()
  (multiple-value-bind (in out) (unix:unix-pipe)
    (values (sys:make-fd-stream in :input t :buffering :none)
            (sys:make-fd-stream out :output t :buffering :none))))


;;;; Stream handling
;;; XXX: How come we don't use Gray streams in CMUCL too? -luke (15/May/2004)

(defimplementation make-output-stream (write-string)
  (make-slime-output-stream write-string))

(defimplementation make-input-stream (read-string)
  (make-slime-input-stream read-string))

(defstruct (slime-output-stream
             (:include lisp::lisp-stream
                       (lisp::misc #'sos/misc)
                       (lisp::out #'sos/write-char)
                       (lisp::sout #'sos/write-string))
             (:conc-name sos.)
             (:print-function %print-slime-output-stream)
             (:constructor make-slime-output-stream (output-fn)))
  (output-fn nil :type function)
  (buffer (make-string 4000) :type string)
  (index 0 :type kernel:index)
  (column 0 :type kernel:index))

(defun %print-slime-output-stream (s stream d)
  (declare (ignore d))
  (print-unreadable-object (s stream :type t :identity t)))

(defun sos/write-char (stream char)
  (let ((pending-output nil))
    (system:without-interrupts 
      (let ((buffer (sos.buffer stream))
            (index (sos.index stream)))
        (setf (schar buffer index) char)
        (setf (sos.index stream) (1+ index))
        (incf (sos.column stream))
        (when (char= #\newline char)
          (setf (sos.column stream) 0)
          #+(or)(setq pending-output (sos/reset-buffer stream))
          )
        (when (= index (1- (length buffer)))
          (setq pending-output (sos/reset-buffer stream)))))
    (when pending-output
      (funcall (sos.output-fn stream) pending-output)))
  char)

(defun sos/write-string (stream string start end)
  (loop for i from start below end 
        do (sos/write-char stream (aref string i))))

(defun sos/flush (stream)
  (let ((string (sos/reset-buffer stream)))
    (when string
      (funcall (sos.output-fn stream) string))
    nil))

(defun sos/reset-buffer (stream)
  (system:without-interrupts 
    (let ((end (sos.index stream)))
      (unless (zerop end)
        (prog1 (subseq (sos.buffer stream) 0 end)
          (setf (sos.index stream) 0))))))

(defun sos/misc (stream operation &optional arg1 arg2)
  (declare (ignore arg1 arg2))
  (case operation
    ((:force-output :finish-output) (sos/flush stream))
    (:charpos (sos.column stream))
    (:line-length 75)
    (:file-position nil)
    (:element-type 'base-char)
    (:get-command nil)
    (:close nil)
    (t (format *terminal-io* "~&~Astream: ~S~%" stream operation))))

(defstruct (slime-input-stream
             (:include string-stream
                       (lisp::in #'sis/in)
                       (lisp::misc #'sis/misc))
             (:conc-name sis.)
             (:print-function %print-slime-output-stream)
             (:constructor make-slime-input-stream (input-fn)))
  (input-fn nil :type function)
  (buffer   ""  :type string)
  (index    0   :type kernel:index))

(defun sis/in (stream eof-errorp eof-value)
  (let ((index (sis.index stream))
	(buffer (sis.buffer stream)))
    (when (= index (length buffer))
      (let ((string (funcall (sis.input-fn stream))))
        (cond ((zerop (length string))
               (return-from sis/in
                 (if eof-errorp
                     (error (make-condition 'end-of-file :stream stream))
                     eof-value)))
              (t
               (setf buffer string)
               (setf (sis.buffer stream) buffer)
               (setf index 0)))))
    (prog1 (aref buffer index)
      (setf (sis.index stream) (1+ index)))))

(defun sis/misc (stream operation &optional arg1 arg2)
  (declare (ignore arg2))
  (ecase operation
    (:file-position nil)
    (:file-length nil)
    (:unread (setf (aref (sis.buffer stream) 
			 (decf (sis.index stream)))
		   arg1))
    (:clear-input 
     (setf (sis.index stream) 0
			(sis.buffer stream) ""))
    (:listen (< (sis.index stream) (length (sis.buffer stream))))
    (:charpos nil)
    (:line-length nil)
    (:get-command nil)
    (:element-type 'base-char)
    (:close nil)
    (:interactive-p t)))


;;;; Compilation Commands

(defvar *previous-compiler-condition* nil
  "Used to detect duplicates.")

(defvar *previous-context* nil
  "Previous compiler error context.")

(defvar *buffer-name* nil
  "The name of the Emacs buffer we are compiling from.
NIL if we aren't compiling from a buffer.")

(defvar *buffer-start-position* nil)
(defvar *buffer-substring* nil)

(defimplementation call-with-compilation-hooks (function)
  (let ((*previous-compiler-condition* nil)
        (*previous-context* nil)
        (*print-readably* nil))
    (handler-bind ((c::compiler-error #'handle-notification-condition)
                   (c::style-warning  #'handle-notification-condition)
                   (c::warning        #'handle-notification-condition))
      (funcall function))))

(defimplementation swank-compile-file (input-file output-file
                                       load-p external-format
                                       &key policy)
  (declare (ignore external-format policy))
  (clear-xref-info input-file)
  (with-compilation-hooks ()
    (let ((*buffer-name* nil)
          (ext:*ignore-extra-close-parentheses* nil))
      (multiple-value-bind (output-file warnings-p failure-p)
          (compile-file input-file :output-file output-file)
        (values output-file warnings-p
                (or failure-p
                    (when load-p
                      ;; Cache the latest source file for definition-finding.
                      (source-cache-get input-file 
                                        (file-write-date input-file))
                      (not (load output-file)))))))))

(defimplementation swank-compile-string (string &key buffer position filename
                                         policy)
  (declare (ignore filename policy))
  (with-compilation-hooks ()
    (let ((*buffer-name* buffer)
          (*buffer-start-position* position)
          (*buffer-substring* string)
          (source-info (list :emacs-buffer buffer 
                             :emacs-buffer-offset position
                             :emacs-buffer-string string)))
      (with-input-from-string (stream string)
        (let ((failurep (ext:compile-from-stream stream :source-info 
                                                source-info)))
          (not failurep))))))
  

;;;;; Trapping notes
;;;
;;; We intercept conditions from the compiler and resignal them as
;;; `SWANK:COMPILER-CONDITION's.

(defun handle-notification-condition (condition)
  "Handle a condition caused by a compiler warning."
  (unless (eq condition *previous-compiler-condition*)
    (let ((context (c::find-error-context nil)))
      (setq *previous-compiler-condition* condition)
      (setq *previous-context* context)
      (signal-compiler-condition condition context))))

(defun signal-compiler-condition (condition context)
  (signal (make-condition
           'compiler-condition
           :original-condition condition
           :severity (severity-for-emacs condition)
           :message (compiler-condition-message condition)
           :source-context (compiler-error-context context)
           :location (if (read-error-p condition)
                         (read-error-location condition)
                         (compiler-note-location context)))))

(defun severity-for-emacs (condition)
  "Return the severity of CONDITION."
  (etypecase condition
    ((satisfies read-error-p) :read-error)
    (c::compiler-error :error)
    (c::style-warning :note)
    (c::warning :warning)))

(defun read-error-p (condition)
  (eq (type-of condition) 'c::compiler-read-error))

(defun compiler-condition-message (condition)
  "Briefly describe a compiler error for Emacs.
When Emacs presents the message it already has the source popped up
and the source form highlighted. This makes much of the information in
the error-context redundant."
  (princ-to-string condition))

(defun compiler-error-context (error-context)
  "Describe context information for Emacs."
  (declare (type (or c::compiler-error-context null) error-context))
  (multiple-value-bind (enclosing source)
      (if error-context
          (values (c::compiler-error-context-enclosing-source error-context)
                  (c::compiler-error-context-source error-context)))
    (if (or enclosing source)
        (format nil "~@[--> ~{~<~%--> ~1:;~A ~>~}~%~]~
                     ~@[==>~{~&~A~}~]"
                enclosing source))))

(defun read-error-location (condition)
  (let* ((finfo (car (c::source-info-current-file c::*source-info*)))
         (file (c::file-info-name finfo))
         (pos (c::compiler-read-error-position condition)))
    (cond ((and (eq file :stream) *buffer-name*)
           (make-location (list :buffer *buffer-name*)
                          (list :offset *buffer-start-position* pos)))
          ((and (pathnamep file) (not *buffer-name*))
           (make-location (list :file (unix-truename file))
                          (list :position (1+ pos))))
          (t (break)))))

(defun compiler-note-location (context)
  "Derive the location of a complier message from its context.
Return a `location' record, or (:error REASON) on failure."
  (if (null context)
      (note-error-location)
      (with-struct (c::compiler-error-context- file-name 
                                               original-source
                                               original-source-path) context
        (or (locate-compiler-note file-name original-source 
                                  (reverse original-source-path))
            (note-error-location)))))

(defun note-error-location ()
  "Pseudo-location for notes that can't be located."
  (cond (*compile-file-truename*
         (make-location (list :file (unix-truename *compile-file-truename*))
                        (list :eof)))
        (*buffer-name*
         (make-location (list :buffer *buffer-name*)
                        (list :position *buffer-start-position*)))
        (t (list :error "No error location available."))))

(defun locate-compiler-note (file source source-path)
  (cond ((and (eq file :stream) *buffer-name*)
         ;; Compiling from a buffer
         (make-location (list :buffer *buffer-name*)
                        (list :offset *buffer-start-position*
                              (source-path-string-position
                               source-path *buffer-substring*))))
        ((and (pathnamep file) (null *buffer-name*))
         ;; Compiling from a file
         (make-location (list :file (unix-truename file))
                        (list :position (1+ (source-path-file-position
                                             source-path file)))))
        ((and (eq file :lisp) (stringp source))
         ;; No location known, but we have the source form.
         ;; XXX How is this case triggered?  -luke (16/May/2004) 
         ;; This can happen if the compiler needs to expand a macro
         ;; but the macro-expander is not yet compiled.  Calling the
         ;; (interpreted) macro-expander triggers IR1 conversion of
         ;; the lambda expression for the expander and invokes the
         ;; compiler recursively.
         (make-location (list :source-form source)
                        (list :position 1)))))

(defun unix-truename (pathname)
  (ext:unix-namestring (truename pathname)))


;;;; XREF
;;;
;;; Cross-reference support is based on the standard CMUCL `XREF'
;;; package. This package has some caveats: XREF information is
;;; recorded during compilation and not preserved in fasl files, and
;;; XREF recording is disabled by default. Redefining functions can
;;; also cause duplicate references to accumulate, but
;;; `swank-compile-file' will automatically clear out any old records
;;; from the same filename.
;;;
;;; To enable XREF recording, set `c:*record-xref-info*' to true. To
;;; clear out the XREF database call `xref:init-xref-database'.

(defmacro defxref (name function)
  `(defimplementation ,name (name)
    (xref-results (,function name))))

(defxref who-calls      xref:who-calls)
(defxref who-references xref:who-references)
(defxref who-binds      xref:who-binds)
(defxref who-sets       xref:who-sets)

;;; More types of XREF information were added since 18e:
;;;
#-cmu18
(progn
  (defxref who-macroexpands xref:who-macroexpands)
  ;; XXX
  (defimplementation who-specializes (symbol)
    (let* ((methods (xref::who-specializes (find-class symbol)))
           (locations (mapcar #'method-location methods)))
      (mapcar #'list methods locations))))

(defun xref-results (contexts)
  (mapcar (lambda (xref)
            (list (xref:xref-context-name xref)
                  (resolve-xref-location xref)))
          contexts))

(defun resolve-xref-location (xref)
  (let ((name (xref:xref-context-name xref))
        (file (xref:xref-context-file xref))
        (source-path (xref:xref-context-source-path xref)))
    (cond ((and file source-path)
           (let ((position (source-path-file-position source-path file)))
             (make-location (list :file (unix-truename file))
                            (list :position (1+ position)))))
          (file
           (make-location (list :file (unix-truename file))
                          (list :function-name (string name))))
          (t
           `(:error ,(format nil "Unknown source location: ~S ~S ~S " 
                             name file source-path))))))

(defun clear-xref-info (namestring)
  "Clear XREF notes pertaining to NAMESTRING.
This is a workaround for a CMUCL bug: XREF records are cumulative."
  (when c:*record-xref-info*
    (let ((filename (truename namestring)))
      (dolist (db (list xref::*who-calls*
                        #-cmu18 xref::*who-is-called*
                        #-cmu18 xref::*who-macroexpands*
                        xref::*who-references*
                        xref::*who-binds*
                        xref::*who-sets*))
        (maphash (lambda (target contexts)
                   ;; XXX update during traversal?  
                   (setf (gethash target db)
                         (delete filename contexts 
                                 :key #'xref:xref-context-file
                                 :test #'equalp)))
                 db)))))


;;;; Find callers and callees
;;;
;;; Find callers and callees by looking at the constant pool of
;;; compiled code objects.  We assume every fdefn object in the
;;; constant pool corresponds to a call to that function.  A better
;;; strategy would be to use the disassembler to find actual
;;; call-sites.

(labels ((make-stack () (make-array 100 :fill-pointer 0 :adjustable t))
         (map-cpool (code fun)
           (declare (type kernel:code-component code) (type function fun))
           (loop for i from vm:code-constants-offset 
                 below (kernel:get-header-data code)
                 do (funcall fun (kernel:code-header-ref code i))))

         (callees (fun)
           (let ((callees (make-stack)))
             (map-cpool (vm::find-code-object fun)
                        (lambda (o)
                          (when (kernel:fdefn-p o)
                            (vector-push-extend (kernel:fdefn-function o)
                                                callees))))
             (coerce callees 'list)))

         (callers (fun)
           (declare (function fun))
           (let ((callers (make-stack)))
             (ext:gc :full t)
             ;; scan :dynamic first to avoid the need for even more gcing
             (dolist (space '(:dynamic :read-only :static))
               (vm::map-allocated-objects
                (lambda (obj header size)
                  (declare (type fixnum header) (ignore size))
                  (when (= vm:code-header-type header)
                    (map-cpool obj
                               (lambda (c)
                                 (when (and (kernel:fdefn-p c)
                                            (eq (kernel:fdefn-function c) fun))
                                   (vector-push-extend obj callers))))))
                space)
               (ext:gc))
             (coerce callers 'list)))

         (entry-points (code)
           (loop for entry = (kernel:%code-entry-points code) 
                 then (kernel::%function-next entry)
                 while entry
                 collect entry))
           
         (guess-main-entry-point (entry-points)
           (or (find-if (lambda (fun)
                          (ext:valid-function-name-p 
                           (kernel:%function-name fun)))
                        entry-points)
               (car entry-points)))

         (fun-dspec (fun)
           (list (kernel:%function-name fun) (function-location fun)))
         
         (code-dspec (code)
           (let ((eps (entry-points code))
                 (di (kernel:%code-debug-info code)))
             (cond (eps (fun-dspec (guess-main-entry-point eps)))
                   (di (list (c::debug-info-name di)
                             (debug-info-function-name-location di)))
                   (t (list (princ-to-string code)
                            `(:error "No src-loc available")))))))
  (declare (inline map-cpool))

  (defimplementation list-callers (symbol)
    (mapcar #'code-dspec (callers (coerce symbol 'function) )))

  (defimplementation list-callees (symbol)
    (mapcar #'fun-dspec (callees symbol))))

(defun test-list-callers (count)
  (let ((funsyms '()))
    (do-all-symbols (s)
      (when (and (fboundp s)
                 (functionp (symbol-function s))
                 (not (macro-function s))
                 (not (special-operator-p s)))
        (push s funsyms)))
    (let ((len (length funsyms)))
      (dotimes (i count)
        (let ((sym (nth (random len) funsyms)))
          (format t "~s -> ~a~%" sym (mapcar #'car (list-callers sym))))))))

;; (test-list-callers 100)


;;;; Resolving source locations
;;;
;;; Our mission here is to "resolve" references to code locations into
;;; actual file/buffer names and character positions. The references
;;; we work from come out of the compiler's statically-generated debug
;;; information, such as `code-location''s and `debug-source''s. For
;;; more details, see the "Debugger Programmer's Interface" section of
;;; the CMUCL manual.
;;;
;;; The first step is usually to find the corresponding "source-path"
;;; for the location. Once we have the source-path we can pull up the
;;; source file and `READ' our way through to the right position. The
;;; main source-code groveling work is done in
;;; `swank-source-path-parser.lisp'.

(defvar *debug-definition-finding* nil
  "When true don't handle errors while looking for definitions.
This is useful when debugging the definition-finding code.")

(defvar *source-snippet-size* 256
  "Maximum number of characters in a snippet of source code.
Snippets at the beginning of definitions are used to tell Emacs what
the definitions looks like, so that it can accurately find them by
text search.")

(defmacro safe-definition-finding (&body body)
  "Execute BODY and return the source-location it returns.
If an error occurs and `*debug-definition-finding*' is false, then
return an error pseudo-location.

The second return value is NIL if no error occurs, otherwise it is the
condition object."
  `(flet ((body () ,@body))
    (if *debug-definition-finding*
        (body)
        (handler-case (values (progn ,@body) nil)
          (error (c) (values `(:error ,(trim-whitespace (princ-to-string c)))
                             c))))))

(defun trim-whitespace (string)
  (string-trim #(#\newline #\space #\tab) string))

(defun code-location-source-location (code-location)
  "Safe wrapper around `code-location-from-source-location'."
  (safe-definition-finding
   (source-location-from-code-location code-location)))

(defun source-location-from-code-location (code-location)
  "Return the source location for CODE-LOCATION."
  (let ((debug-fun (di:code-location-debug-function code-location)))
    (when (di::bogus-debug-function-p debug-fun)
      ;; Those lousy cheapskates! They've put in a bogus debug source
      ;; because the code was compiled at a low debug setting.
      (error "Bogus debug function: ~A" debug-fun)))
  (let* ((debug-source (di:code-location-debug-source code-location))
         (from (di:debug-source-from debug-source))
         (name (di:debug-source-name debug-source)))
    (ecase from
      (:file 
       (location-in-file name code-location debug-source))
      (:stream
       (location-in-stream code-location debug-source))
      (:lisp
       ;; The location comes from a form passed to `compile'.
       ;; The best we can do is return the form itself for printing.
       (make-location
        (list :source-form (with-output-to-string (*standard-output*)
                             (debug::print-code-location-source-form 
                              code-location 100 t)))
        (list :position 1))))))

(defun location-in-file (filename code-location debug-source)
  "Resolve the source location for CODE-LOCATION in FILENAME."
  (let* ((code-date (di:debug-source-created debug-source))
         (root-number (di:debug-source-root-number debug-source))
         (source-code (get-source-code filename code-date)))
    (with-input-from-string (s source-code)
      (make-location (list :file (unix-truename filename))
                     (list :position (1+ (code-location-stream-position
                                          code-location s root-number)))
                     `(:snippet ,(read-snippet s))))))

(defun location-in-stream (code-location debug-source)
  "Resolve the source location for a CODE-LOCATION from a stream.
This only succeeds if the code was compiled from an Emacs buffer."
  (unless (debug-source-info-from-emacs-buffer-p debug-source)
    (error "The code is compiled from a non-SLIME stream."))
  (let* ((info (c::debug-source-info debug-source))
         (string (getf info :emacs-buffer-string))
         (position (code-location-string-offset 
                    code-location
                    string)))
    (make-location
     (list :buffer (getf info :emacs-buffer))
     (list :offset (getf info :emacs-buffer-offset) position)
     (list :snippet (with-input-from-string (s string)
                      (file-position s position)
                      (read-snippet s))))))

;;;;; Function-name locations
;;;
(defun debug-info-function-name-location (debug-info)
  "Return a function-name source-location for DEBUG-INFO.
Function-name source-locations are a fallback for when precise
positions aren't available."
  (with-struct (c::debug-info- (fname name) source) debug-info
    (with-struct (c::debug-source- info from name) (car source)
      (ecase from
        (:file 
         (make-location (list :file (namestring (truename name)))
                        (list :function-name (string fname))))
        (:stream
         (assert (debug-source-info-from-emacs-buffer-p (car source)))
         (make-location (list :buffer (getf info :emacs-buffer))
                        (list :function-name (string fname))))
        (:lisp
         (make-location (list :source-form (princ-to-string (aref name 0)))
                        (list :position 1)))))))

(defun debug-source-info-from-emacs-buffer-p (debug-source)
  "Does the `info' slot of DEBUG-SOURCE contain an Emacs buffer location?
This is true for functions that were compiled directly from buffers."
  (info-from-emacs-buffer-p (c::debug-source-info debug-source)))

(defun info-from-emacs-buffer-p (info)
  (and info 
       (consp info)
       (eq :emacs-buffer (car info))))


;;;;; Groveling source-code for positions

(defun code-location-stream-position (code-location stream root)
  "Return the byte offset of CODE-LOCATION in STREAM.  Extract the
toplevel-form-number and form-number from CODE-LOCATION and use that
to find the position of the corresponding form.

Finish with STREAM positioned at the start of the code location."
  (let* ((location (debug::maybe-block-start-location code-location))
	 (tlf-offset (- (di:code-location-top-level-form-offset location)
                        root))
	 (form-number (di:code-location-form-number location)))
    (let ((pos (form-number-stream-position tlf-offset form-number stream)))
      (file-position stream pos)
      pos)))

(defun form-number-stream-position (tlf-number form-number stream)
  "Return the starting character position of a form in STREAM.
TLF-NUMBER is the top-level-form number.
FORM-NUMBER is an index into a source-path table for the TLF."
  (multiple-value-bind (tlf position-map) (read-source-form tlf-number stream)
    (let* ((path-table (di:form-number-translations tlf 0))
           (source-path
            (if (<= (length path-table) form-number) ; source out of sync?
                (list 0)                ; should probably signal a condition
                (reverse (cdr (aref path-table form-number))))))
      (source-path-source-position source-path tlf position-map))))
  
(defun code-location-string-offset (code-location string)
  "Return the byte offset of CODE-LOCATION in STRING.
See CODE-LOCATION-STREAM-POSITION."
  (with-input-from-string (s string)
    (code-location-stream-position code-location s 0)))


;;;; Finding definitions

;;; There are a great many different types of definition for us to
;;; find. We search for definitions of every kind and return them in a
;;; list.

(defimplementation find-definitions (name)
  (append (function-definitions name)
          (setf-definitions name)
          (variable-definitions name)
          (class-definitions name)
          (type-definitions name)
          (compiler-macro-definitions name)
          (source-transform-definitions name)
          (function-info-definitions name)
          (ir1-translator-definitions name)
          (template-definitions name)
          (primitive-definitions name)
          (vm-support-routine-definitions name)
          ))

;;;;; Functions, macros, generic functions, methods
;;;
;;; We make extensive use of the compile-time debug information that
;;; CMUCL records, in particular "debug functions" and "code
;;; locations." Refer to the "Debugger Programmer's Interface" section
;;; of the CMUCL manual for more details.

(defun function-definitions (name)
  "Return definitions for NAME in the \"function namespace\", i.e.,
regular functions, generic functions, methods and macros.
NAME can any valid function name (e.g, (setf car))."
  (let ((macro?    (and (symbolp name) (macro-function name)))
        (function? (and (ext:valid-function-name-p name)
                        (ext:info :function :definition name)
                        (if (symbolp name) (fboundp name) t))))
    (cond (macro? 
           (list `((defmacro ,name)
                   ,(function-location (macro-function name)))))
          (function?
           (let ((function (fdefinition name)))
             (if (genericp function)
                 (gf-definitions name function)
                 (list (list `(function ,name)
                             (function-location function)))))))))

;;;;;; Ordinary (non-generic/macro/special) functions
;;;
;;; First we test if FUNCTION is a closure created by defstruct, and
;;; if so extract the defstruct-description (`dd') from the closure
;;; and find the constructor for the struct.  Defstruct creates a
;;; defun for the default constructor and we use that as an
;;; approximation to the source location of the defstruct.
;;;
;;; For an ordinary function we return the source location of the
;;; first code-location we find.
;;;
(defun function-location (function)
  "Return the source location for FUNCTION."
  (cond ((struct-closure-p function)
         (struct-closure-location function))
        ((c::byte-function-or-closure-p function)
         (byte-function-location function))
        (t
         (compiled-function-location function))))

(defun compiled-function-location (function)
  "Return the location of a regular compiled function."
  (multiple-value-bind (code-location error)
      (safe-definition-finding (function-first-code-location function))
    (cond (error (list :error (princ-to-string error)))
          (t (code-location-source-location code-location)))))

(defun function-first-code-location (function)
  "Return the first code-location we can find for FUNCTION."
  (and (function-has-debug-function-p function)
       (di:debug-function-start-location
        (di:function-debug-function function))))

(defun function-has-debug-function-p (function)
  (di:function-debug-function function))

(defun function-code-object= (closure function)
  (and (eq (vm::find-code-object closure)
	   (vm::find-code-object function))
       (not (eq closure function))))

(defun byte-function-location (fun)
  "Return the location of the byte-compiled function FUN."
  (etypecase fun
    ((or c::hairy-byte-function c::simple-byte-function)
     (let* ((di (kernel:%code-debug-info (c::byte-function-component fun))))
       (if di 
           (debug-info-function-name-location di)
           `(:error 
             ,(format nil "Byte-function without debug-info: ~a" fun)))))
    (c::byte-closure
     (byte-function-location (c::byte-closure-function fun)))))

;;; Here we deal with structure accessors. Note that `dd' is a
;;; "defstruct descriptor" structure in CMUCL. A `dd' describes a
;;; `defstruct''d structure.

(defun struct-closure-p (function)
  "Is FUNCTION a closure created by defstruct?"
  (or (function-code-object= function #'kernel::structure-slot-accessor)
      (function-code-object= function #'kernel::structure-slot-setter)
      (function-code-object= function #'kernel::%defstruct)))

(defun struct-closure-location (function)
  "Return the location of the structure that FUNCTION belongs to."
  (assert (struct-closure-p function))
  (safe-definition-finding
    (dd-location (struct-closure-dd function))))

(defun struct-closure-dd (function)
  "Return the defstruct-definition (dd) of FUNCTION."
  (assert (= (kernel:get-type function) vm:closure-header-type))
  (flet ((find-layout (function)
	   (sys:find-if-in-closure 
	    (lambda (x) 
	      (let ((value (if (di::indirect-value-cell-p x)
			       (c:value-cell-ref x) 
			       x)))
		(when (kernel::layout-p value)
		  (return-from find-layout value))))
	    function)))
    (kernel:layout-info (find-layout function))))

(defun dd-location (dd)
  "Return the location of a `defstruct'."
  ;; Find the location in a constructor.
  (function-location (struct-constructor dd)))

(defun struct-constructor (dd)
  "Return a constructor function from a defstruct definition.
Signal an error if no constructor can be found."
  (let* ((constructor (or (kernel:dd-default-constructor dd)
                          (car (kernel::dd-constructors dd))))
         (sym (if (consp constructor) (car constructor) constructor)))
    (unless sym
      (error "Cannot find structure's constructor: ~S" (kernel::dd-name dd)))
    (coerce sym 'function)))

;;;;;; Generic functions and methods

(defun gf-definitions (name function)
  "Return the definitions of a generic function and its methods."
  (cons (list `(defgeneric ,name) (gf-location function))
        (gf-method-definitions function)))

(defun gf-location (gf)
  "Return the location of the generic function GF."
  (definition-source-location gf (pcl::generic-function-name gf)))

(defun gf-method-definitions (gf)
  "Return the locations of all methods of the generic function GF."
  (mapcar #'method-definition (pcl::generic-function-methods gf)))

(defun method-definition (method)
  (list (method-dspec method)
        (method-location method)))

(defun method-dspec (method)
  "Return a human-readable \"definition specifier\" for METHOD."
  (let* ((gf (pcl:method-generic-function method))
         (name (pcl:generic-function-name gf))
         (specializers (pcl:method-specializers method))
         (qualifiers (pcl:method-qualifiers method)))
    `(method ,name ,@qualifiers ,(pcl::unparse-specializers specializers))))

;; XXX maybe special case setters/getters
(defun method-location (method)
  (function-location (or (pcl::method-fast-function method)
                         (pcl:method-function method))))

(defun genericp (fn)
  (typep fn 'generic-function))

;;;;;; Types and classes

(defun type-definitions (name)
  "Return `deftype' locations for type NAME."
  (maybe-make-definition (ext:info :type :expander name) 'deftype name))

(defun maybe-make-definition (function kind name)
  "If FUNCTION is non-nil then return its definition location."
  (if function
      (list (list `(,kind ,name) (function-location function)))))

(defun class-definitions (name)
  "Return the definition locations for the class called NAME."
  (if (symbolp name)
      (let ((class (kernel::find-class name nil)))
        (etypecase class
          (null '())
          (kernel::structure-class 
           (list (list `(defstruct ,name) (dd-location (find-dd name)))))
          #+(or)
          (conditions::condition-class
           (list (list `(define-condition ,name) 
                       (condition-class-location class))))
          (kernel::standard-class
           (list (list `(defclass ,name) 
                       (class-location (find-class name)))))
          ((or kernel::built-in-class 
               conditions::condition-class
               kernel:funcallable-structure-class)
           (list (list `(kernel::define-type-class ,name)
                       `(:error 
                         ,(format nil "No source info for ~A" name)))))))))

(defun class-location (class)
  "Return the `defclass' location for CLASS."
  (definition-source-location class (pcl:class-name class)))

(defun find-dd (name)
  "Find the defstruct-definition by the name of its structure-class."
  (let ((layout (ext:info :type :compiler-layout name)))
    (if layout 
        (kernel:layout-info layout))))

(defun condition-class-location (class)
  (let ((slots (conditions::condition-class-slots class))
        (name (conditions::condition-class-name class)))
    (cond ((null slots)
           `(:error ,(format nil "No location info for condition: ~A" name)))
          (t
           ;; Find the class via one of its slot-reader methods.
           (let* ((slot (first slots))
                  (gf (fdefinition 
                       (first (conditions::condition-slot-readers slot)))))
             (method-location 
              (first 
               (pcl:compute-applicable-methods-using-classes 
                gf (list (find-class name))))))))))

(defun make-name-in-file-location (file string)
  (multiple-value-bind (filename c)
      (ignore-errors 
        (unix-truename (merge-pathnames (make-pathname :type "lisp")
                                        file)))
    (cond (filename (make-location `(:file ,filename)
                                   `(:function-name ,(string string))))
          (t (list :error (princ-to-string c))))))

(defun source-location-form-numbers (location)
  (c::decode-form-numbers (c::form-numbers-form-numbers location)))

(defun source-location-tlf-number (location)
  (nth-value 0 (source-location-form-numbers location)))

(defun source-location-form-number (location)
  (nth-value 1 (source-location-form-numbers location)))

(defun resolve-file-source-location (location)
  (let ((filename (c::file-source-location-pathname location))
        (tlf-number (source-location-tlf-number location))
        (form-number (source-location-form-number location)))
    (with-open-file (s filename)
      (let ((pos (form-number-stream-position tlf-number form-number s)))
        (make-location `(:file ,(unix-truename filename))
                       `(:position ,(1+ pos)))))))

(defun resolve-stream-source-location (location)
  (let ((info (c::stream-source-location-user-info location))
        (tlf-number (source-location-tlf-number location))
        (form-number (source-location-form-number location)))
    ;; XXX duplication in frame-source-location
    (assert (info-from-emacs-buffer-p info))
    (destructuring-bind (&key emacs-buffer emacs-buffer-string 
                              emacs-buffer-offset) info
      (with-input-from-string (s emacs-buffer-string)
        (let ((pos (form-number-stream-position tlf-number form-number s)))
          (make-location `(:buffer ,emacs-buffer)
                         `(:offset ,emacs-buffer-offset ,pos)))))))

;; XXX predicates for 18e backward compatibilty.  Remove them when
;; we're 19a only.
(defun file-source-location-p (object) 
  (when (fboundp 'c::file-source-location-p)
    (c::file-source-location-p object)))

(defun stream-source-location-p (object)
  (when (fboundp 'c::stream-source-location-p)
    (c::stream-source-location-p object)))

(defun source-location-p (object)
  (or (file-source-location-p object)
      (stream-source-location-p object)))

(defun resolve-source-location (location)
  (etypecase location
    ((satisfies file-source-location-p)
     (resolve-file-source-location location))
    ((satisfies stream-source-location-p)
     (resolve-stream-source-location location))))

(defun definition-source-location (object name)
  (let ((source (pcl::definition-source object)))
    (etypecase source
      (null 
       `(:error ,(format nil "No source info for: ~A" object)))
      ((satisfies source-location-p)
       (resolve-source-location source))
      (pathname 
       (make-name-in-file-location source name))
      (cons
       (destructuring-bind ((dg name) pathname) source
         (declare (ignore dg))
         (etypecase pathname
           (pathname (make-name-in-file-location pathname (string name)))
           (null `(:error ,(format nil "Cannot resolve: ~S" source)))))))))

(defun setf-definitions (name)
  (let ((f (or (ext:info :setf :inverse name)
               (ext:info :setf :expander name)
               (and (symbolp name)
                    (fboundp `(setf ,name))
                    (fdefinition `(setf ,name))))))
    (if f
        `(((setf ,name) ,(function-location (cond ((functionp  f) f)
                                                  ((macro-function f))
                                                  ((fdefinition f)))))))))

(defun variable-location (symbol)
  (multiple-value-bind (location foundp)
      ;; XXX for 18e compatibilty. rewrite this when we drop 18e
      ;; support.
      (ignore-errors (eval `(ext:info :source-location :defvar ',symbol)))
    (if (and foundp location)
        (resolve-source-location location)
        `(:error ,(format nil "No source info for variable ~S" symbol)))))

(defun variable-definitions (name)
  (if (symbolp name)
      (multiple-value-bind (kind recorded-p) (ext:info :variable :kind name)
        (if recorded-p
            (list (list `(variable ,kind ,name)
                        (variable-location name)))))))

(defun compiler-macro-definitions (symbol)
  (maybe-make-definition (compiler-macro-function symbol)
                         'define-compiler-macro
                         symbol))

(defun source-transform-definitions (name)
  (maybe-make-definition (ext:info :function :source-transform name)
                         'c:def-source-transform
                         name))

(defun function-info-definitions (name)
  (let ((info (ext:info :function :info name)))
    (if info
        (append (loop for transform in (c::function-info-transforms info)
                      collect (list `(c:deftransform ,name 
                                      ,(c::type-specifier 
                                        (c::transform-type transform)))
                                    (function-location (c::transform-function 
                                                        transform))))
                (maybe-make-definition (c::function-info-derive-type info)
                                       'c::derive-type name)
                (maybe-make-definition (c::function-info-optimizer info)
                                       'c::optimizer name)
                (maybe-make-definition (c::function-info-ltn-annotate info)
                                       'c::ltn-annotate name)
                (maybe-make-definition (c::function-info-ir2-convert info)
                                       'c::ir2-convert name)
                (loop for template in (c::function-info-templates info)
                      collect (list `(,(type-of template)
                                       ,(c::template-name templ…

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