398 lines
14 KiB
EmacsLisp
398 lines
14 KiB
EmacsLisp
;; Run gdb under Emacs
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;; Copyright (C) 1988 Free Software Foundation, Inc.
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 1, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to
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;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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;; Author: W. Schelter, University of Texas
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;; wfs@rascal.ics.utexas.edu
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;; Rewritten by rms.
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;; Some ideas are due to Masanobu.
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;; Description of GDB interface:
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;; A facility is provided for the simultaneous display of the source code
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;; in one window, while using gdb to step through a function in the
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;; other. A small arrow in the source window, indicates the current
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;; line.
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;; Starting up:
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;; In order to use this facility, invoke the command GDB to obtain a
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;; shell window with the appropriate command bindings. You will be asked
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;; for the name of a file to run. Gdb will be invoked on this file, in a
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;; window named *gdb-foo* if the file is foo.
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;; M-s steps by one line, and redisplays the source file and line.
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;; You may easily create additional commands and bindings to interact
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;; with the display. For example to put the gdb command next on \M-n
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;; (def-gdb next "\M-n")
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;; This causes the emacs command gdb-next to be defined, and runs
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;; gdb-display-frame after the command.
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;; gdb-display-frame is the basic display function. It tries to display
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;; in the other window, the file and line corresponding to the current
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;; position in the gdb window. For example after a gdb-step, it would
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;; display the line corresponding to the position for the last step. Or
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;; if you have done a backtrace in the gdb buffer, and move the cursor
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;; into one of the frames, it would display the position corresponding to
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;; that frame.
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;; gdb-display-frame is invoked automatically when a filename-and-line-number
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;; appears in the output.
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(require 'shell)
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(defvar gdb-prompt-pattern "^(.*gdb[+]?) *"
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"A regexp to recognize the prompt for gdb or gdb+.")
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(defvar gdb-mode-map nil
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"Keymap for gdb-mode.")
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(if gdb-mode-map
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nil
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(setq gdb-mode-map (copy-keymap shell-mode-map))
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(define-key gdb-mode-map "\C-l" 'gdb-refresh))
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(define-key ctl-x-map " " 'gdb-break)
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(define-key ctl-x-map "&" 'send-gdb-command)
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;;Of course you may use `def-gdb' with any other gdb command, including
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;;user defined ones.
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(defmacro def-gdb (name key &optional doc)
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(let* ((fun (intern (format "gdb-%s" name)))
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(cstr (list 'if '(not (= 1 arg))
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(list 'format "%s %s" name 'arg)
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name)))
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(list 'progn
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(list 'defun fun '(arg)
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(or doc "")
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'(interactive "p")
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(list 'gdb-call cstr))
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(list 'define-key 'gdb-mode-map key (list 'quote fun)))))
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(def-gdb "step" "\M-s" "Step one source line with display")
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(def-gdb "stepi" "\M-i" "Step one instruction with display")
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(def-gdb "next" "\M-n" "Step one source line (skip functions)")
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(def-gdb "cont" "\M-c" "Continue with display")
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(def-gdb "finish" "\C-c\C-f" "Finish executing current function")
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(def-gdb "up" "\M-u" "Go up N stack frames (numeric arg) with display")
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(def-gdb "down" "\M-d" "Go down N stack frames (numeric arg) with display")
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(defun gdb-mode ()
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"Major mode for interacting with an inferior Gdb process.
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The following commands are available:
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\\{gdb-mode-map}
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\\[gdb-display-frame] displays in the other window
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the last line referred to in the gdb buffer.
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\\[gdb-step],\\[gdb-next], and \\[gdb-nexti] in the gdb window,
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call gdb to step,next or nexti and then update the other window
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with the current file and position.
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If you are in a source file, you may select a point to break
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at, by doing \\[gdb-break].
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Commands:
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Many commands are inherited from shell mode.
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Additionally we have:
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\\[gdb-display-frame] display frames file in other window
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\\[gdb-step] advance one line in program
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\\[gdb-next] advance one line in program (skip over calls).
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\\[send-gdb-command] used for special printing of an arg at the current point.
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C-x SPACE sets break point at current line."
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(interactive)
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(kill-all-local-variables)
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(setq major-mode 'gdb-mode)
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(setq mode-name "Inferior Gdb")
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(setq mode-line-process '(": %s"))
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(use-local-map gdb-mode-map)
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(make-local-variable 'last-input-start)
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(setq last-input-start (make-marker))
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(make-local-variable 'last-input-end)
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(setq last-input-end (make-marker))
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(make-local-variable 'gdb-last-frame)
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(setq gdb-last-frame nil)
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(make-local-variable 'gdb-last-frame-displayed-p)
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(setq gdb-last-frame-displayed-p t)
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(make-local-variable 'gdb-delete-prompt-marker)
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(setq gdb-delete-prompt-marker nil)
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(make-local-variable 'gdb-filter-accumulator)
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(setq gdb-filter-accumulator nil)
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(make-local-variable 'shell-prompt-pattern)
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(setq shell-prompt-pattern gdb-prompt-pattern)
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(run-hooks 'shell-mode-hook 'gdb-mode-hook))
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(defvar current-gdb-buffer nil)
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(defvar gdb-command-name "gdb"
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"Pathname for executing gdb.")
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(defun gdb (path)
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"Run gdb on program FILE in buffer *gdb-FILE*.
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The directory containing FILE becomes the initial working directory
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and source-file directory for GDB. If you wish to change this, use
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the GDB commands `cd DIR' and `directory'."
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(interactive "FRun gdb on file: ")
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(setq path (expand-file-name path))
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(let ((file (file-name-nondirectory path)))
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(switch-to-buffer (concat "*gdb-" file "*"))
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(setq default-directory (file-name-directory path))
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(or (bolp) (newline))
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(insert "Current directory is " default-directory "\n")
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(make-shell (concat "gdb-" file) gdb-command-name nil "-fullname"
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"-cd" default-directory file)
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(gdb-mode)
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(set-process-filter (get-buffer-process (current-buffer)) 'gdb-filter)
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(set-process-sentinel (get-buffer-process (current-buffer)) 'gdb-sentinel)
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(gdb-set-buffer)))
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(defun gdb-set-buffer ()
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(cond ((eq major-mode 'gdb-mode)
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(setq current-gdb-buffer (current-buffer)))))
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;; This function is responsible for inserting output from GDB
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;; into the buffer.
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;; Aside from inserting the text, it notices and deletes
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;; each filename-and-line-number;
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;; that GDB prints to identify the selected frame.
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;; It records the filename and line number, and maybe displays that file.
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(defun gdb-filter (proc string)
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(let ((inhibit-quit t))
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(if gdb-filter-accumulator
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(gdb-filter-accumulate-marker proc
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(concat gdb-filter-accumulator string))
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(gdb-filter-scan-input proc string))))
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(defun gdb-filter-accumulate-marker (proc string)
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(setq gdb-filter-accumulator nil)
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(if (> (length string) 1)
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(if (= (aref string 1) ?\032)
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(let ((end (string-match "\n" string)))
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(if end
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(progn
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(let* ((first-colon (string-match ":" string 2))
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(second-colon
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(string-match ":" string (1+ first-colon))))
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(setq gdb-last-frame
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(cons (substring string 2 first-colon)
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(string-to-int
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(substring string (1+ first-colon)
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second-colon)))))
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(setq gdb-last-frame-displayed-p nil)
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(gdb-filter-scan-input proc
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(substring string (1+ end))))
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(setq gdb-filter-accumulator string)))
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(gdb-filter-insert proc "\032")
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(gdb-filter-scan-input proc (substring string 1)))
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(setq gdb-filter-accumulator string)))
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(defun gdb-filter-scan-input (proc string)
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(if (equal string "")
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(setq gdb-filter-accumulator nil)
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(let ((start (string-match "\032" string)))
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(if start
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(progn (gdb-filter-insert proc (substring string 0 start))
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(gdb-filter-accumulate-marker proc
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(substring string start)))
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(gdb-filter-insert proc string)))))
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(defun gdb-filter-insert (proc string)
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(let ((moving (= (point) (process-mark proc)))
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(output-after-point (< (point) (process-mark proc)))
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(old-buffer (current-buffer))
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start)
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(set-buffer (process-buffer proc))
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(unwind-protect
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(save-excursion
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;; Insert the text, moving the process-marker.
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(goto-char (process-mark proc))
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(setq start (point))
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(insert string)
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(set-marker (process-mark proc) (point))
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(gdb-maybe-delete-prompt)
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;; Check for a filename-and-line number.
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(gdb-display-frame
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;; Don't display the specified file
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;; unless (1) point is at or after the position where output appears
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;; and (2) this buffer is on the screen.
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(or output-after-point
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(not (get-buffer-window (current-buffer))))
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;; Display a file only when a new filename-and-line-number appears.
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t))
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(set-buffer old-buffer))
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(if moving (goto-char (process-mark proc)))))
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(defun gdb-sentinel (proc msg)
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(cond ((null (buffer-name (process-buffer proc)))
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;; buffer killed
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;; Stop displaying an arrow in a source file.
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(setq overlay-arrow-position nil)
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(set-process-buffer proc nil))
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((memq (process-status proc) '(signal exit))
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;; Stop displaying an arrow in a source file.
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(setq overlay-arrow-position nil)
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;; Fix the mode line.
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(setq mode-line-process
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(concat ": "
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(symbol-name (process-status proc))))
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(let* ((obuf (current-buffer)))
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;; save-excursion isn't the right thing if
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;; process-buffer is current-buffer
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(unwind-protect
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(progn
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;; Write something in *compilation* and hack its mode line,
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(set-buffer (process-buffer proc))
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;; Force mode line redisplay soon
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(set-buffer-modified-p (buffer-modified-p))
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(if (eobp)
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(insert ?\n mode-name " " msg)
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(save-excursion
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(goto-char (point-max))
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(insert ?\n mode-name " " msg)))
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;; If buffer and mode line will show that the process
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;; is dead, we can delete it now. Otherwise it
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;; will stay around until M-x list-processes.
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(delete-process proc))
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;; Restore old buffer, but don't restore old point
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;; if obuf is the gdb buffer.
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(set-buffer obuf))))))
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(defun gdb-refresh ()
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"Fix up a possibly garbled display, and redraw the arrow."
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(interactive)
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(redraw-display)
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(gdb-display-frame))
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(defun gdb-display-frame (&optional nodisplay noauto)
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"Find, obey and delete the last filename-and-line marker from GDB.
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The marker looks like \\032\\032FILENAME:LINE:CHARPOS\\n.
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Obeying it means displaying in another window the specified file and line."
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(interactive)
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(gdb-set-buffer)
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(and gdb-last-frame (not nodisplay)
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(or (not gdb-last-frame-displayed-p) (not noauto))
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(progn (gdb-display-line (car gdb-last-frame) (cdr gdb-last-frame))
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(setq gdb-last-frame-displayed-p t))))
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;; Make sure the file named TRUE-FILE is in a buffer that appears on the screen
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;; and that its line LINE is visible.
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;; Put the overlay-arrow on the line LINE in that buffer.
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(defun gdb-display-line (true-file line)
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(let* ((buffer (find-file-noselect true-file))
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(window (display-buffer buffer t))
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(pos))
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(save-excursion
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(set-buffer buffer)
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(save-restriction
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(widen)
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(goto-line line)
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(setq pos (point))
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(setq overlay-arrow-string "=>")
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(or overlay-arrow-position
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(setq overlay-arrow-position (make-marker)))
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(set-marker overlay-arrow-position (point) (current-buffer)))
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(cond ((or (< pos (point-min)) (> pos (point-max)))
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(widen)
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(goto-char pos))))
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(set-window-point window overlay-arrow-position)))
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(defun gdb-call (command)
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"Invoke gdb COMMAND displaying source in other window."
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(interactive)
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(goto-char (point-max))
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(setq gdb-delete-prompt-marker (point-marker))
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(gdb-set-buffer)
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(send-string (get-buffer-process current-gdb-buffer)
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(concat command "\n")))
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(defun gdb-maybe-delete-prompt ()
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(if (and gdb-delete-prompt-marker
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(> (point-max) (marker-position gdb-delete-prompt-marker)))
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(let (start)
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(goto-char gdb-delete-prompt-marker)
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(setq start (point))
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(beginning-of-line)
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(delete-region (point) start)
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(setq gdb-delete-prompt-marker nil))))
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(defun gdb-break ()
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"Set GDB breakpoint at this source line."
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(interactive)
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(let ((file-name (file-name-nondirectory buffer-file-name))
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(line (save-restriction
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(widen)
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(1+ (count-lines 1 (point))))))
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(send-string (get-buffer-process current-gdb-buffer)
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(concat "break " file-name ":" line "\n"))))
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(defun gdb-read-address()
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"Return a string containing the core-address found in the buffer at point."
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(save-excursion
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(let ((pt (dot)) found begin)
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(setq found (if (search-backward "0x" (- pt 7) t)(dot)))
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(cond (found (forward-char 2)(setq result
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(buffer-substring found
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(progn (re-search-forward "[^0-9a-f]")
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(forward-char -1)
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(dot)))))
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(t (setq begin (progn (re-search-backward "[^0-9]") (forward-char 1)
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(dot)))
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(forward-char 1)
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(re-search-forward "[^0-9]")
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(forward-char -1)
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(buffer-substring begin (dot)))))))
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(defvar gdb-commands nil
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"List of strings or functions used by send-gdb-command.
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It is for customization by you.")
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(defun send-gdb-command (arg)
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"This command reads the number where the cursor is positioned. It
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then inserts this ADDR at the end of the gdb buffer. A numeric arg
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selects the ARG'th member COMMAND of the list gdb-print-command. If
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COMMAND is a string, (format COMMAND ADDR) is inserted, otherwise
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(funcall COMMAND ADDR) is inserted. eg. \"p (rtx)%s->fld[0].rtint\"
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is a possible string to be a member of gdb-commands. "
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(interactive "P")
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(let (comm addr)
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(if arg (setq comm (nth arg gdb-commands)))
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(setq addr (gdb-read-address))
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(if (eq (current-buffer) current-gdb-buffer)
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(set-mark (point)))
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(cond (comm
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(setq comm
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(if (stringp comm) (format comm addr) (funcall comm addr))))
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(t (setq comm addr)))
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(switch-to-buffer current-gdb-buffer)
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(goto-char (dot-max))
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(insert-string comm)))
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