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629 lines
22 KiB
EmacsLisp
629 lines
22 KiB
EmacsLisp
;;; gud.el --- Grand Unified Debugger mode for gdb, sdb, or dbx under Emacs
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;; Author: Eric S. Raymond <eric@snark.thyrsus.com>
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;; Keywords: unix, tools
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;; %W%
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;; Copyright (C) 1992 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 2, 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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;;; Commentary:
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;; The ancestral gdb.el was by W. Schelter <wfs@rascal.ics.utexas.edu>
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;; It was later rewritten by rms. Some ideas were due to Masanobu.
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;; Grand Unification (sdb/dbx support) by Eric S. Raymond <esr@thyrsus.com>
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;; The overloading code was then rewritten by Barry Warsaw <bwarsaw@cen.com>,
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;; who also hacked the mode to use comint.el.
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;; Note: use of this package with sdb requires that your tags.el support
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;; the find-tag-noselect entry point. Stock distributions up to 18.57 do
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;; *not* include this feature; if it's not included with this file, email
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;; esr@snark.thyrsus.com for it or get 18.58.
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;; Further note: due to lossage in the Emacs-18 byte compiler, compiled
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;; versions of this code will fail with a complaint about gud-step if
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;; you invoke the gdb or sdb initializers. This should be fixed in 19.
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;;; Code:
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(require 'comint)
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(require 'etags)
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;; ======================================================================
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;; the overloading mechanism
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(defun gud-overload-functions (gud-overload-alist)
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"Overload functions defined in GUD-OVERLOAD-ALIST.
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This association list has elements of the form
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(ORIGINAL-FUNCTION-NAME OVERLOAD-FUNCTION)"
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(mapcar
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(function (lambda (p) (fset (car p) (symbol-function (cdr p)))))
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gud-overload-alist))
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(defun gud-debugger-startup (f d)
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(error "GUD not properly entered."))
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(defun gud-marker-filter (proc s)
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(error "GUD not properly entered."))
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(defun gud-visit-file (f)
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(error "GUD not properly entered."))
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(defun gud-set-break (proc f n)
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(error "GUD not properly entered."))
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;; This macro is used below to define some basic debugger interface commands.
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;; Of course you may use `gud-def' with any other debugger command, including
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;; user defined ones.
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;; A macro call like (gud-def FUNC NAME KEY DOC) expands to a form
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;; which defines FUNC to send the command NAME to the debugger, gives
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;; it the docstring DOC, and binds that function to KEY. NAME should
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;; be a string. If a numeric prefix argument is given to FUNC, it
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;; gets sent after NAME.
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(defmacro gud-def (func name key &optional doc)
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(let* ((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 func '(arg)
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(or doc "")
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'(interactive "p")
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(list 'gud-call cstr))
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(if key
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(list 'define-key 'gud-mode-map key (list 'quote func))))))
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;; Where gud-display-frame should put the debugging arrow. This is
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;; set by the marker-filter, which scans the debugger's output for
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;; indications of the current pc.
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(defvar gud-last-frame nil)
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;; All debugger-specific information is collected here
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;; Here's how it works, in case you ever need to add a debugger to the table.
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;;
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;; Each entry must define the following at startup:
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;;
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;;<name>
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;; comint-prompt-regexp
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;; gud-<name>-debugger-startup
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;; gud-<name>-marker-filter
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;; gud-<name>-visit-file
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;; gud-<name>-set-break
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;;
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;; The job of the startup-command method is to fire up a copy of the debugger,
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;; given an object file and source directory.
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;;
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;; The job of the marker-filter method is to detect file/line markers in
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;; strings and set the global gud-last-frame to indicate what display
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;; action (if any) should be triggered by the marker. Note that only
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;; whetever the method *returns* is displayed in the buffer; thus, you
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;; can filter the debugger's output, interpreting some and passing on
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;; the rest.
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;;
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;; The job of the visit-file method is to visit and return the buffer indicated
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;; by the car of gud-tag-frame. This may be a file name, a tag name, or
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;; something else.
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;;
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;; The job of the gud-set-break method is to send the commands necessary
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;; to set a breakpoint at a given line in a given source file.
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;;
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;; Debugger-specific information begins here:
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;; ======================================================================
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;; gdb functions
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(defun gud-gdb-debugger-startup (f d)
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(make-comint (concat "gud-" f) "gdb" nil "-fullname" "-cd" d f))
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(defun gud-gdb-marker-filter (proc string)
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(if (string-match "\032\032\\([^:\n]*\\):\\([0-9]*\\):.*\n" string)
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(progn
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(setq gud-last-frame
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(cons
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(substring string (match-beginning 1) (match-end 1))
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(string-to-int
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(substring string (match-beginning 2) (match-end 2)))))
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;; this computation means the ^Z^Z-initiated marker in the
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;; input string is never emitted.
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(concat
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(substring string 0 (match-beginning 0))
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(substring string (match-end 0))
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))
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string))
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(defun gud-gdb-visit-file (f)
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(find-file-noselect f))
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(defun gud-gdb-set-break (proc f n)
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(gud-call "break %s:%d" f n))
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;;;###autoload
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(defun gdb (path)
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"Run gdb on program FILE in buffer *gud-FILE*.
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The directory containing FILE becomes the initial working directory
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and source-file directory for your debugger."
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(interactive "fRun gdb on file: ")
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(gud-overload-functions '((gud-debugger-startup . gud-gdb-debugger-startup)
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(gud-marker-filter . gud-gdb-marker-filter)
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(gud-visit-file . gud-gdb-visit-file)
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(gud-set-break . gud-gdb-set-break)))
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(gud-def gud-step "step" "\C-c\C-s" "Step one source line with display")
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(gud-def gud-stepi "stepi" "\C-c\C-i" "Step one instruction with display")
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(gud-def gud-next "next" "\C-c\C-n" "Step one line (skip functions)")
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(gud-def gud-cont "cont" "\C-c\C-r" "Continue with display")
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(gud-def gud-finish "finish" "\C-c\C-f" "Finish executing current function")
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(gud-def gud-up "up" "\C-c<" "Up N stack frames (numeric arg)")
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(gud-def gud-down "down" "\C-c>" "Down N stack frames (numeric arg)")
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(gud-common-init path)
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(setq comint-prompt-regexp "^(.*gdb[+]?) *")
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(run-hooks 'gdb-mode-hook)
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)
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;; ======================================================================
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;; sdb functions
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(defun gud-sdb-debugger-startup (f d)
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(make-comint (concat "gud-" f) "sdb" nil f "-" d))
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(defun gud-sdb-marker-filter (proc string)
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(if (string-match "\\(^0x\\w* in \\|^\\|\n\\)\\([^:\n]*\\):\\([0-9]*\\):.*\n"
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string)
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(setq gud-last-frame
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(cons
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(substring string (match-beginning 2) (match-end 2))
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(string-to-int
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(substring string (match-beginning 3) (match-end 3))))))
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string)
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(defun gud-sdb-visit-file (f)
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(find-tag-noselect f))
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(defun gud-sdb-set-break (proc f n)
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(gud-queue-send (format "e %s" f) (format "%d b" n)))
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;;;###autoload
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(defun sdb (path)
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"Run sdb on program FILE in buffer *gud-FILE*.
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The directory containing FILE becomes the initial working directory
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and source-file directory for your debugger."
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(interactive "fRun sdb on file: ")
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(if (not (and (boundp 'tags-file-name) (file-exists-p tags-file-name)))
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(error "The sdb support requires a valid tags table to work."))
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(gud-overload-functions '((gud-debugger-startup . gud-sdb-debugger-startup)
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(gud-marker-filter . gud-sdb-marker-filter)
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(gud-visit-file . gud-sdb-visit-file)
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(gud-set-break . gud-sdb-set-break)))
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(gud-def gud-step "s" "\C-c\C-s" "Step one source line with display")
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(gud-def gud-stepi "i" "\C-c\C-i" "Step one instruction with display")
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(gud-def gud-next "S" "\C-c\C-n" "Step one source line (skip functions)")
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(gud-def gud-cont "c" "\C-c\C-r" "Continue with display (`resume')")
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(gud-common-init path)
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(setq comint-prompt-regexp "\\(^\\|\n\\)\\*")
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(run-hooks 'sdb-mode-hook)
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)
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;; ======================================================================
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;; dbx functions
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(defun gud-dbx-debugger-startup (f d)
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(make-comint (concat "gud-" f) "dbx" nil f))
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(defun gud-dbx-marker-filter (proc string)
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(if (string-match
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"stopped in .* at line \\([0-9]*\\) in file \"\\([^\"]*\\)\"" string)
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(setq gud-last-frame
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(cons
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(substring string (match-beginning 2) (match-end 2))
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(string-to-int
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(substring string (match-beginning 1) (match-end 1))))))
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string)
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(defun gud-dbx-visit-file (f)
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(find-file-noselect f))
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(defun gud-dbx-set-break (proc f n)
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(gud-call "stop at \"%s\":%d" f n))
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;;;###autoload
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(defun dbx (path)
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"Run dbx on program FILE in buffer *gud-FILE*.
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The directory containing FILE becomes the initial working directory
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and source-file directory for your debugger."
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(interactive "fRun dbx on file: ")
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(gud-overload-functions '((gud-debugger-startup . gud-dbx-debugger-startup)
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(gud-marker-filter . gud-dbx-marker-filter)
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(gud-visit-file . gud-dbx-visit-file)
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(gud-set-break . gud-dbx-set-break)))
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(gud-def gud-step "step" "\C-c\C-s" "Step one source line with display")
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(gud-def gud-stepi "stepi" "\C-c\C-i" "Step one instruction with display")
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(gud-def gud-next "next" "\C-c\C-n" "Step one line (skip functions)")
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(gud-def gud-cont "cont" "\C-c\C-r" "Continue with display (`resume')")
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(gud-def gud-up "up" "\C-c<" "Up N stack frames (numeric arg)")
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(gud-def gud-down "down" "\C-c>" "Down N stack frames (numeric arg)")
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(gud-common-init path)
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(setq comint-prompt-regexp "^[^)]*dbx) *")
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(run-hooks 'dbx-mode-hook)
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)
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;;
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;; End of debugger-specific information
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;;
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(defvar gud-mode-map nil
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"Keymap for gud-mode.")
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(defvar gud-commands nil
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"List of strings or functions used by send-gud-command.
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It is for customization by you.")
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(defvar gud-command-queue nil)
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;;; When we send a command to the debugger via gud-call, it's annoying
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;;; to see the command and the new prompt inserted into the debugger's
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;;; buffer; we have other ways of knowing the command has completed.
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;;;
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;;; If the buffer looks like this:
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;;; --------------------
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;;; (gdb) set args foo bar
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;;; (gdb) -!-
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;;; --------------------
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;;; (the -!- marks the location of point), and we type `C-x SPC' in a
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;;; source file to set a breakpoint, we want the buffer to end up like
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;;; this:
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;;; --------------------
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;;; (gdb) set args foo bar
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;;; Breakpoint 1 at 0x92: file make-docfile.c, line 49.
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;;; (gdb) -!-
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;;; --------------------
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;;; Essentially, the old prompt is deleted, and the command's output
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;;; and the new prompt take its place.
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;;;
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;;; Not echoing the command is easy enough; you send it directly using
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;;; process-send-string, and it never enters the buffer. However,
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;;; getting rid of the old prompt is trickier; you don't want to do it
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;;; when you send the command, since that will result in an annoying
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;;; flicker as the prompt is deleted, redisplay occurs while Emacs
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;;; waits for a response from the debugger, and the new prompt is
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;;; inserted. Instead, we'll wait until we actually get some output
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;;; from the subprocess before we delete the prompt. If the command
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;;; produced no output other than a new prompt, that prompt will most
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;;; likely be in the first chunk of output received, so we will delete
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;;; the prompt and then replace it with an identical one. If the
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;;; command produces output, the prompt is moving anyway, so the
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;;; flicker won't be annoying.
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;;;
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;;; So - when we want to delete the prompt upon receipt of the next
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;;; chunk of debugger output, we position gud-delete-prompt-marker at
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;;; the start of the prompt; the process filter will notice this, and
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;;; delete all text between it and the process output marker. If
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;;; gud-delete-prompt-marker points nowhere, we leave the current
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;;; prompt alone.
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(defvar gud-delete-prompt-marker nil)
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(if gud-mode-map
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nil
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(setq gud-mode-map (copy-keymap comint-mode-map))
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(define-key gud-mode-map "\C-c\C-l" 'gud-refresh))
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;; Global mappings --- we'll invoke these from a source buffer.
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(define-key ctl-x-map " " 'gud-break)
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(define-key ctl-x-map "&" 'send-gud-command)
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(defun gud-mode ()
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"Major mode for interacting with an inferior debugger process.
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You start it up with one of the commands M-x gdb, M-x sdb, or
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M-x dbx. Each entry point finishes by executing a hook; gdb-mode-hook,
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sdb-mode-hook or dbx-mode-hook respectively.
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After startup, the following commands are available:
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\\{gud-mode-map}
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\\[gud-refresh] displays in the other window the last line referred to
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in the gud buffer.
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\\[gud-step], \\[gud-next], and \\[gud-stepi] in the gud window,
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do a step-one-line, step-one-line (not entering function calls), and
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step-one-instruction and then update the other window
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with the current file and position. \\[gud-cont] continues
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execution.
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The above commands are common to all supported debuggers. If you are
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using gdb or dbx, the following additional commands will be available:
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\\[gud-up] pops up through an enclosing stack frame. \\[gud-down] drops
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back down through one.
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If you are using gdb, \\[gdb-finish] runs execution to the return from
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the current function and stops.
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These functions repeat themselves the appropriate number of times if you give a
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prefix argument.
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If you are in a source file, you may do the following:
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Set a breakpoint at the current line by doing \\[gud-break]. This causes
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an appropriate set-break to be send to the debugger; of course, if the file
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you're visiting doesn't correspond to any code in the executable this will
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have no effect or raise an error.
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Execute a user-defined command at point with \\[send-gud-command]; the
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prefix argument is taken as an index into the list of strings gud-commands.
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A %s in a gud-commands string is substituted with a number or address picked
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up from point.
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Other commands for interacting with the debugger process are inherited from
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comint mode, which see."
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(interactive)
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(comint-mode)
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; (kill-all-local-variables)
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(setq major-mode 'gud-mode)
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(setq mode-name "Debugger")
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(setq mode-line-process '(": %s"))
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(use-local-map gud-mode-map)
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(make-local-variable 'gud-last-frame)
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(setq gud-last-frame nil)
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(make-local-variable 'comint-prompt-regexp)
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(make-local-variable 'gud-delete-prompt-marker)
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(setq gud-delete-prompt-marker (make-marker))
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(run-hooks 'gud-mode-hook)
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)
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(defvar current-gud-buffer nil)
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(defun gud-common-init (path)
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;; perform initializations common to all debuggers
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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 "*gud-" 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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(gud-debugger-startup file default-directory))
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(gud-mode)
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(set-process-filter (get-buffer-process (current-buffer)) 'gud-filter)
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(set-process-sentinel (get-buffer-process (current-buffer)) 'gud-sentinel)
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(setq gud-command-queue nil)
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(gud-set-buffer)
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)
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(defun gud-set-buffer ()
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(cond ((eq major-mode 'gud-mode)
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(setq current-gud-buffer (current-buffer)))))
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(defun gud-filter (proc string)
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;; This function is responsible for inserting output from your debugger
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;; into the buffer. The hard work is done by the method that is
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;; the value of gud-marker-filter.
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(let ((inhibit-quit t))
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(gud-filter-insert proc (gud-marker-filter proc string))
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;; If we've got queued commands and we see a prompt, pop one and send it.
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;; In theory we should check that a prompt has been issued before sending
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;; queued commands. In practice, command responses from the first through
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;; penultimate elements of a command sequence are short enough that we
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;; don't really have to bother.
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(if gud-command-queue
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(progn
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(gud-call (car gud-command-queue))
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(setq gud-command-queue (cdr gud-command-queue))
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)
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)))
|
||
|
||
(defun gud-filter-insert (proc string)
|
||
;; Here's where the actual buffer insertion is done
|
||
(save-excursion
|
||
(set-buffer (process-buffer proc))
|
||
(let ((moving (= (point) (process-mark proc)))
|
||
(output-after-point (< (point) (process-mark proc))))
|
||
(save-excursion
|
||
(goto-char (process-mark proc))
|
||
;; If we have been so requested, delete the debugger prompt.
|
||
(if (marker-buffer gud-delete-prompt-marker)
|
||
(progn
|
||
(delete-region (point) gud-delete-prompt-marker)
|
||
(set-marker gud-delete-prompt-marker nil)))
|
||
(insert-before-markers string)
|
||
;; Check for a filename-and-line number.
|
||
;; 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.
|
||
(if (and gud-last-frame
|
||
(not output-after-point)
|
||
(get-buffer-window (current-buffer)))
|
||
(gud-display-frame)))
|
||
(if moving (goto-char (process-mark proc))))))
|
||
|
||
(defun gud-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 gud buffer.
|
||
(set-buffer obuf))))))
|
||
|
||
|
||
(defun gud-refresh (&optional arg)
|
||
"Fix up a possibly garbled display, and redraw the arrow."
|
||
(interactive "P")
|
||
(recenter arg)
|
||
(gud-display-frame))
|
||
|
||
(defun gud-display-frame ()
|
||
"Find and obey the last filename-and-line marker from the debugger.
|
||
Obeying it means displaying in another window the specified file and line."
|
||
(interactive)
|
||
(if gud-last-frame
|
||
(progn
|
||
(gud-set-buffer)
|
||
(gud-display-line (car gud-last-frame) (cdr gud-last-frame))
|
||
(setq gud-last-frame nil))))
|
||
|
||
;; 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 gud-display-line (true-file line)
|
||
(let* ((buffer (gud-visit-file 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 gud-call (command &rest args)
|
||
"Invoke the debugger COMMAND displaying source in other window."
|
||
(interactive)
|
||
(gud-set-buffer)
|
||
(let ((command (concat (apply 'format command args) "\n"))
|
||
(proc (get-buffer-process current-gud-buffer)))
|
||
|
||
;; Arrange for the current prompt to get deleted.
|
||
(save-excursion
|
||
(set-buffer current-gud-buffer)
|
||
(goto-char (process-mark proc))
|
||
(beginning-of-line)
|
||
(if (looking-at comint-prompt-regexp)
|
||
(set-marker gud-delete-prompt-marker (point))))
|
||
|
||
(goto-char (point-max))
|
||
(process-send-string proc command)))
|
||
|
||
(defun gud-queue-send (&rest cmdlist)
|
||
;; Send the first command, queue the rest for send after successive
|
||
;; send on subsequent prompts
|
||
(interactive)
|
||
(gud-call (car cmdlist))
|
||
(setq gud-command-queue (append gud-command-queue (cdr cmdlist))))
|
||
|
||
(defun gud-apply-from-source (func)
|
||
;; Apply a method from the gud buffer environment, passing it file and line.
|
||
;; This is intended to be used for gud commands called from a source file.
|
||
(if (not buffer-file-name)
|
||
(error "There is no file associated with this buffer"))
|
||
(let ((file (file-name-nondirectory buffer-file-name))
|
||
(line (save-restriction (widen) (1+ (count-lines 1 (point))))))
|
||
(save-excursion
|
||
(gud-set-buffer)
|
||
(funcall func
|
||
(get-buffer-process current-gud-buffer)
|
||
file
|
||
line)
|
||
)))
|
||
|
||
(defun gud-break ()
|
||
"Set breakpoint at this source line."
|
||
(interactive)
|
||
(gud-apply-from-source 'gud-set-break))
|
||
|
||
(defun gud-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)))))))
|
||
|
||
|
||
(defun send-gud-command (arg)
|
||
"This command reads the number where the cursor is positioned. A numeric arg
|
||
selects the ARG'th member COMMAND of the list gud-commands. If COMMAND is a
|
||
string, (format COMMAND ADDR) is inserted at the end of the debugger buffer,
|
||
otherwise (funcall COMMAND ADDR) is inserted.
|
||
For example, \"p (rtx)%s->fld[0].rtint\" is a possible string to be a
|
||
member of gud-commands."
|
||
(interactive "P")
|
||
(let (comm addr)
|
||
(if arg (setq comm (nth arg gud-commands)))
|
||
(setq addr (gud-read-address))
|
||
(if (eq (current-buffer) current-gud-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-gud-buffer)
|
||
(goto-char (point-max))
|
||
(insert-string comm)))
|
||
|
||
;;; gud.el ends here
|