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- ;; Run gdb under Emacs
- ;; Author: W. Schelter, University of Texas
- ;; wfs@rascal.ics.utexas.edu
- ;; Rewritten by rms.
-
- ;; Some ideas are due to Masanobu.
-
- ;; This file is part of GNU Emacs.
- ;; Copyright (C) 1988 Free Software Foundation, Inc.
-
- ;; GNU Emacs is distributed in the hope that it will be useful, but
- ;; WITHOUT ANY WARRANTY. No author or distributor accepts responsibility
- ;; to anyone for the consequences of using it or for whether it serves
- ;; any particular purpose or works at all, unless he says so in writing.
- ;; Refer to the GNU Emacs General Public License for full details.
-
- ;; Everyone is granted permission to copy, modify and redistribute GNU
- ;; Emacs, but only under the conditions described in the GNU Emacs
- ;; General Public License. A copy of this license is supposed to have
- ;; been given to you along with GNU Emacs so you can know your rights and
- ;; responsibilities. It should be in a file named COPYING. Among other
- ;; things, the copyright notice and this notice must be preserved on all
- ;; copies.
-
- ;; Description of GDB interface:
-
- ;; A facility is provided for the simultaneous display of the source code
- ;; in one window, while using gdb to step through a function in the
- ;; other. A small arrow in the source window, indicates the current
- ;; line.
-
- ;; Starting up:
-
- ;; In order to use this facility, invoke the command GDB to obtain a
- ;; shell window with the appropriate command bindings. You will be asked
- ;; for the name of a file to run. Gdb will be invoked on this file, in a
- ;; window named *gdb-foo* if the file is foo.
-
- ;; M-s steps by one line, and redisplays the source file and line.
-
- ;; You may easily create additional commands and bindings to interact
- ;; with the display. For example to put the gdb command next on \M-n
- ;; (def-gdb next "\M-n")
-
- ;; This causes the emacs command gdb-next to be defined, and runs
- ;; gdb-display-frame after the command.
-
- ;; gdb-display-frame is the basic display function. It tries to display
- ;; in the other window, the file and line corresponding to the current
- ;; position in the gdb window. For example after a gdb-step, it would
- ;; display the line corresponding to the position for the last step. Or
- ;; if you have done a backtrace in the gdb buffer, and move the cursor
- ;; into one of the frames, it would display the position corresponding to
- ;; that frame.
-
- ;; gdb-display-frame is invoked automatically when a filename-and-line-number
- ;; appears in the output.
-
-
- (require 'comint)
- (require 'shell)
-
- (defvar gdb-last-frame)
- (defvar gdb-delete-prompt-marker)
- (defvar gdb-filter-accumulator)
- (defvar gdb-last-frame-displayed-p)
-
- (defvar gdb-prompt-pattern "^(.*gdb[+]?) *"
- "A regexp to recognize the prompt for gdb or gdb+.")
-
- (defvar gdb-mode-map nil
- "Keymap for gdb-mode.")
-
- (if gdb-mode-map
- nil
- (setq gdb-mode-map (copy-keymap comint-mode-map))
- (define-key gdb-mode-map "\C-l" 'gdb-refresh)
- (define-key gdb-mode-map "\C-c\C-c" 'gdb-control-c-subjob)
- (define-key gdb-mode-map "\t" 'comint-dynamic-complete)
- (define-key gdb-mode-map "\M-?" 'comint-dynamic-list-completions))
-
- (define-key ctl-x-map " " 'gdb-break)
- (define-key ctl-x-map "&" 'send-gdb-command)
-
- ;;Of course you may use `def-gdb' with any other gdb command, including
- ;;user defined ones.
-
- (defmacro def-gdb (name key &optional doc)
- (let* ((fun (intern (format "gdb-%s" name)))
- (cstr (list 'if '(not (= 1 arg))
- (list 'format "%s %s" name 'arg)
- name)))
- (list 'progn
- (list 'defun fun '(arg)
- (or doc "")
- '(interactive "p")
- (list 'gdb-call cstr))
- (if key
- (list 'define-key 'gdb-mode-map key (list 'quote fun))
- nil))))
-
- (def-gdb "step" "\M-s" "Step one source line with display")
- (def-gdb "stepi" "\M-i" "Step one instruction with display")
- (def-gdb "finish" "\C-c\C-f" "Finish executing current function")
-
- ;;"next" and "cont" were bound to M-n and M-c in Emacs 18, but these are
- ;;poor choices, since M-n is used for history navigation and M-c is
- ;;capitalize-word. These are defined without key bindings so that users
- ;;may choose their own bindings.
- (def-gdb "next" nil "Step one source line (skip functions)")
- (def-gdb "cont" nil "Proceed with the program")
-
- (def-gdb "up" "\C-c<" "Go up N stack frames (numeric arg) with display")
- (def-gdb "down" "\C-c>" "Go down N stack frames (numeric arg) with display")
-
-
- (defun gdb-mode ()
- "Major mode for interacting with an inferior Gdb process.
- The following commands are available:
-
- \\{gdb-mode-map}
-
- \\[gdb-display-frame] displays in the other window
- the last line referred to in the gdb buffer.
-
- \\[gdb-step],\\[gdb-next], and \\[gdb-nexti] in the gdb window,
- call gdb to step,next or nexti and then update the other window
- with the current file and position.
-
- If you are in a source file, you may select a point to break
- at, by doing \\[gdb-break].
-
- Commands:
- Many commands are inherited from comint mode.
- Additionally we have:
-
- \\[gdb-display-frame] display frames file in other window
- \\[gdb-step] advance one line in program
- \\[send-gdb-command] used for special printing of an arg at the current point.
- C-x SPACE sets break point at current line."
- (interactive)
- (comint-mode)
- (use-local-map gdb-mode-map)
- (set-syntax-table c-mode-syntax-table)
- (mapcar 'make-local-variable
- '(gdb-last-frame-displayed-p gdb-last-frame
- gdb-delete-prompt-marker gdb-filter-accumulator))
- (setq
- gdb-last-frame nil
- gdb-delete-prompt-marker nil
- gdb-filter-accumulator nil
- major-mode 'gdb-mode
- mode-name "Inferior GDB"
- comint-prompt-regexp gdb-prompt-pattern
- gdb-last-frame-displayed-p t)
- (make-local-variable 'shell-dirtrackp)
- (setq shell-dirtrackp t)
- (setq comint-input-sentinel 'shell-directory-tracker)
- (run-hooks 'gdb-mode-hook))
-
- (defvar current-gdb-buffer nil)
-
- (defvar gdb-command-name "gdb"
- "Pathname for executing gdb.")
-
- (defun gdb (path)
- "Run gdb on program FILE in buffer *gdb-FILE*.
- The directory containing FILE becomes the initial working directory
- and source-file directory for GDB. If you wish to change this, use
- the GDB commands `cd DIR' and `directory'."
- (interactive "fRun gdb on file: ")
- (setq path (expand-file-name path))
- (let ((file (file-name-nondirectory path)))
- (switch-to-buffer (concat "*gdb-" file "*"))
- (setq default-directory (file-name-directory path))
- (or (bolp) (newline))
- (insert "Current directory is " default-directory "\n")
- (make-comint (concat "gdb-" file) (substitute-in-file-name gdb-command-name)
- nil "-fullname"
- "-cd" default-directory file)
- (gdb-mode)
- (set-process-filter (get-buffer-process (current-buffer)) 'gdb-filter)
- (set-process-sentinel (get-buffer-process (current-buffer)) 'gdb-sentinel)
- (gdb-set-buffer)))
-
- (defun gdb-set-buffer ()
- (cond ((eq major-mode 'gdb-mode)
- (setq current-gdb-buffer (current-buffer)))))
-
- ;; This function is responsible for inserting output from GDB
- ;; into the buffer.
- ;; Aside from inserting the text, it notices and deletes
- ;; each filename-and-line-number;
- ;; that GDB prints to identify the selected frame.
- ;; It records the filename and line number, and maybe displays that file.
- (defun gdb-filter (proc string)
- (let ((inhibit-quit t))
- (if gdb-filter-accumulator
- (gdb-filter-accumulate-marker proc
- (concat gdb-filter-accumulator string))
- (gdb-filter-scan-input proc string))))
-
- (defun gdb-filter-accumulate-marker (proc string)
- (setq gdb-filter-accumulator nil)
- (if (> (length string) 1)
- (if (= (aref string 1) ?\032)
- (let ((end (string-match "\n" string)))
- (if end
- (progn
- (let* ((first-colon (string-match ":" string 2))
- (second-colon
- (string-match ":" string (1+ first-colon))))
- (setq gdb-last-frame
- (cons (substring string 2 first-colon)
- (string-to-int
- (substring string (1+ first-colon)
- second-colon)))))
- (setq gdb-last-frame-displayed-p nil)
- (gdb-filter-scan-input proc
- (substring string (1+ end))))
- (setq gdb-filter-accumulator string)))
- (gdb-filter-insert proc "\032")
- (gdb-filter-scan-input proc (substring string 1)))
- (setq gdb-filter-accumulator string)))
-
- (defun gdb-filter-scan-input (proc string)
- (if (equal string "")
- (setq gdb-filter-accumulator nil)
- (let ((start (string-match "\032" string)))
- (if start
- (progn (gdb-filter-insert proc (substring string 0 start))
- (gdb-filter-accumulate-marker proc
- (substring string start)))
- (gdb-filter-insert proc string)))))
-
- (defun gdb-filter-insert (proc string)
- (let ((moving (= (point) (process-mark proc)))
- (output-after-point (< (point) (process-mark proc)))
- (old-buffer (current-buffer))
- start)
- (set-buffer (process-buffer proc))
- (unwind-protect
- (save-excursion
- ;; Insert the text, moving the process-marker.
- (goto-char (process-mark proc))
- (setq start (point))
- (insert-before-markers string)
- (set-marker (process-mark proc) (point))
- (gdb-maybe-delete-prompt)
- ;; Check for a filename-and-line number.
- (gdb-display-frame
- ;; Don't display the specified file
- ;; unless (1) point is at or after the position where output appears
- ;; and (2) this buffer is on the screen.
- (or output-after-point
- (not (get-buffer-window (current-buffer))))
- ;; Display a file only when a new filename-and-line-number appears.
- t))
- (set-buffer old-buffer))
- (if moving (goto-char (process-mark proc)))))
-
- (defun gdb-sentinel (proc msg)
- (cond ((null (buffer-name (process-buffer proc)))
- ;; buffer killed
- ;; Stop displaying an arrow in a source file.
- (setq overlay-arrow-position nil)
- (set-process-buffer proc nil))
- ((memq (process-status proc) '(signal exit))
- ;; Stop displaying an arrow in a source file.
- (setq overlay-arrow-position nil)
- ;; Fix the mode line.
- (setq mode-line-process
- (concat ": "
- (symbol-name (process-status proc))))
- (let* ((obuf (current-buffer)))
- ;; save-excursion isn't the right thing if
- ;; process-buffer is current-buffer
- (unwind-protect
- (progn
- ;; Write something in *compilation* and hack its mode line,
- (set-buffer (process-buffer proc))
- ;; Force mode line redisplay soon
- (set-buffer-modified-p (buffer-modified-p))
- (if (eobp)
- (insert ?\n mode-name " " msg)
- (save-excursion
- (goto-char (point-max))
- (insert ?\n mode-name " " msg)))
- ;; If buffer and mode line will show that the process
- ;; is dead, we can delete it now. Otherwise it
- ;; will stay around until M-x list-processes.
- (delete-process proc))
- ;; Restore old buffer, but don't restore old point
- ;; if obuf is the gdb buffer.
- (set-buffer obuf))))))
-
-
- (defun gdb-refresh (&optional arg)
- "Fix up a possibly garbled display, and redraw the arrow."
- (interactive "P")
- (recenter arg)
- (gdb-display-frame))
-
- (defun gdb-display-frame (&optional nodisplay noauto)
- "Find, obey and delete the last filename-and-line marker from GDB.
- The marker looks like \\032\\032FILENAME:LINE:CHARPOS\\n.
- Obeying it means displaying in another window the specified file and line."
- (interactive)
- (gdb-set-buffer)
- (and gdb-last-frame (not nodisplay)
- (or (not gdb-last-frame-displayed-p) (not noauto))
- (progn (gdb-display-line (car gdb-last-frame) (cdr gdb-last-frame))
- (setq gdb-last-frame-displayed-p t))))
-
- ;; Make sure the file named TRUE-FILE is in a buffer that appears on the screen
- ;; and that its line LINE is visible.
- ;; Put the overlay-arrow on the line LINE in that buffer.
-
- (defun gdb-display-line (true-file line)
- (let* ((pre-display-buffer-function nil) ; screw it, put it all in one screen
- (pop-up-windows t)
- (buffer (find-file-noselect true-file))
- (window (display-buffer buffer t))
- (pos))
- (save-excursion
- (set-buffer buffer)
- (save-restriction
- (widen)
- (goto-line line)
- (setq pos (point))
- (setq overlay-arrow-string "=>")
- (or overlay-arrow-position
- (setq overlay-arrow-position (make-marker)))
- (set-marker overlay-arrow-position (point) (current-buffer)))
- (cond ((or (< pos (point-min)) (> pos (point-max)))
- (widen)
- (goto-char pos))))
- (set-window-point window overlay-arrow-position)))
-
- (defun gdb-call (command)
- "Invoke gdb COMMAND displaying source in other window."
- (interactive)
- (goto-char (point-max))
- ;; Record info on the last prompt in the buffer and its position.
- ;; This is used in gdb-maybe-delete-prompt
- ;; to prevent multiple prompts from accumulating.
- (save-excursion
- (goto-char (process-mark (get-buffer-process current-gdb-buffer)))
- (let ((pt (point)))
- (beginning-of-line)
- (setq gdb-delete-prompt-marker
- (if (= (point) pt)
- nil
- (list (point-marker) (- pt (point))
- (buffer-substring (point) pt))))))
- (gdb-set-buffer)
- (send-string (get-buffer-process current-gdb-buffer)
- (concat command "\n")))
-
- (defun gdb-maybe-delete-prompt ()
- (if gdb-delete-prompt-marker
- ;; Get the string that we used as the prompt before.
- (let ((prompt (nth 2 gdb-delete-prompt-marker))
- (length (nth 1 gdb-delete-prompt-marker)))
- ;; Position after it.
- (goto-char (+ (car gdb-delete-prompt-marker) length))
- ;; Delete any duplicates of it which follow right after.
- (while (and (<= (+ (point) length) (point-max))
- (string= prompt
- (buffer-substring (point) (+ (point) length))))
- (delete-region (point) (+ (point) length)))
- ;; If that didn't take us to where output is arriving,
- ;; we have encountered something other than a prompt,
- ;; so stop trying to delete any more prompts.
- (if (not (= (point)
- (process-mark (get-buffer-process current-gdb-buffer))))
- (progn
- (set-marker (car gdb-delete-prompt-marker) nil)
- (setq gdb-delete-prompt-marker nil))))))
-
- (defun gdb-break (temp)
- "Set GDB breakpoint at this source line. With ARG set temporary breakpoint."
- (interactive "P")
- (let ((file-name (file-name-nondirectory buffer-file-name))
- (line (save-restriction
- (widen)
- (beginning-of-line)
- (1+ (count-lines 1 (point))))))
- (send-string (get-buffer-process current-gdb-buffer)
- (concat (if temp "tbreak " "break ")
- file-name ":" line "\n"))))
-
- (defun gdb-read-address()
- "Return a string containing the core-address found in the buffer at point."
- (save-excursion
- (let ((pt (point)) found begin)
- (setq found (if (search-backward "0x" (- pt 7) t)(point)))
- (cond (found (forward-char 2)
- (buffer-substring found
- (progn (re-search-forward "[^0-9a-f]")
- (forward-char -1)
- (point))))
- (t (setq begin (progn (re-search-backward "[^0-9]") (forward-char 1)
- (point)))
- (forward-char 1)
- (re-search-forward "[^0-9]")
- (forward-char -1)
- (buffer-substring begin (point)))))))
-
-
- (defvar gdb-commands nil
- "List of strings or functions used by send-gdb-command.
- It is for customization by you.")
-
- (defun send-gdb-command (arg)
-
- "This command reads the number where the cursor is positioned. It
- then inserts this ADDR at the end of the gdb buffer. A numeric arg
- selects the ARG'th member COMMAND of the list gdb-print-command. If
- COMMAND is a string, (format COMMAND ADDR) is inserted, otherwise
- (funcall COMMAND ADDR) is inserted. eg. \"p (rtx)%s->fld[0].rtint\"
- is a possible string to be a member of gdb-commands. "
-
-
- (interactive "P")
- (let (comm addr)
- (if arg (setq comm (nth arg gdb-commands)))
- (setq addr (gdb-read-address))
- (if (eq (current-buffer) current-gdb-buffer)
- (set-mark (point)))
- (cond (comm
- (setq comm
- (if (stringp comm) (format comm addr) (funcall comm addr))))
- (t (setq comm addr)))
- (switch-to-buffer current-gdb-buffer)
- (goto-char (point-max))
- (insert-string comm)))
-
- (defun gdb-control-c-subjob ()
- "Send a Control-C to the subprocess."
- (interactive)
- (process-send-string (get-buffer-process (current-buffer))
- "\C-c"))
-
- (provide 'gdb)
-