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go-dlv.el
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go-dlv.el
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;;; go-dlv.el --- Go Delve - Debug Go programs interactively with the GUD.
;; Copyright (C) 2015, 2019 Marko Bencun
;; Author: Marko Bencun <[email protected]>
;; URL: https://github.com/benma/go-dlv.el/
;; Version: 0.6
;; Package-Requires: ((go-mode "1.3.1"))
;; Keywords: Go, debug, debugger, delve, interactive, gud
;; This file is part of go-dlv.
;; go-dlv is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; go-dlv is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with go-dlv. If not, see <http://www.gnu.org/licenses/>.
;;; Installation
;; If you are using Emacs 24 or later, you can get go-dlv from [melpa](https://melpa.org/) with the package manager.
;; Add the following code to your init file.
;; ----------------------------------------------------------
;; (add-to-list 'load-path "folder-in-which-go-dlv-files-are-in/") ;; if the files are not already in the load path
;; (require 'go-dlv)
;; ----------------------------------------------------------
;;; Code:
;; The code below is based on gud's pdb debugger, adapted to dlv:
;; https://github.com/emacs-mirror/emacs/blob/8badbad184c75d6a9b17b72900ca091a1bd11397/lisp/progmodes/gud.el#L1594-1698
(require 'gud)
(require 'go-mode)
;; Sample marker lines:
;; > main.main() ./test.go:10 (hits goroutine(5):1 total:1)
;; > [unrecovered-panic] runtime.fatalpanic() /usr/lib/golang/src/runtime/panic.go:681 (hits goroutine(16):1 total:1) (PC: 0x435140)
;; Frame 2: /usr/lib/golang/src/testing/testing.go:792 (PC: 50fc82)
(defvar go-dlv-marker-regexp
"^\\(?:\\(?:> .+?(.*?) \\)\\|\\(?:Frame [0-9]+: \\)\\)\\(.+?\\)\\:\\([0-9]+\\)")
(defvar go-dlv-marker-regexp-file-group 1)
(defvar go-dlv-marker-regexp-line-group 2)
(defvar go-dlv-marker-regexp-start "^> ")
(defvar go-dlv-marker-acc "")
(make-variable-buffer-local 'go-dlv-marker-acc)
;; There's no guarantee that Emacs will hand the filter the entire
;; marker at once; it could be broken up across several strings. We
;; might even receive a big chunk with several markers in it. If we
;; receive a chunk of text which looks like it might contain the
;; beginning of a marker, we save it here between calls to the
;; filter.
(defun go-dlv-marker-filter (string)
(setq go-dlv-marker-acc (concat go-dlv-marker-acc string))
(let ((output ""))
;; Process all the complete markers in this chunk.
(while (string-match go-dlv-marker-regexp go-dlv-marker-acc)
(setq
;; Extract the frame position from the marker.
gud-last-frame
(let ((file (match-string go-dlv-marker-regexp-file-group
go-dlv-marker-acc))
(line (string-to-number
(match-string go-dlv-marker-regexp-line-group
go-dlv-marker-acc))))
(cons file line))
;; Output everything instead of the below
output (concat output (substring go-dlv-marker-acc 0 (match-end 0)))
;; ;; Append any text before the marker to the output we're going
;; ;; to return - we don't include the marker in this text.
;; output (concat output
;; (substring go-dlv-marker-acc 0 (match-beginning 0)))
;; Set the accumulator to the remaining text.
go-dlv-marker-acc (substring go-dlv-marker-acc (match-end 0))))
;; Does the remaining text look like it might end with the
;; beginning of another marker? If it does, then keep it in
;; go-dlv-marker-acc until we receive the rest of it. Since we
;; know the full marker regexp above failed, it's pretty simple to
;; test for marker starts.
(if (string-match go-dlv-marker-regexp-start go-dlv-marker-acc)
(progn
;; Everything before the potential marker start can be output.
(setq output (concat output (substring go-dlv-marker-acc
0 (match-beginning 0))))
;; Everything after, we save, to combine with later input.
(setq go-dlv-marker-acc
(substring go-dlv-marker-acc (match-beginning 0))))
(setq output (concat output go-dlv-marker-acc)
go-dlv-marker-acc ""))
output))
(define-obsolete-variable-alias 'go-dlv-command-name
'gud-dlv-command-name
"0.4")
(defcustom gud-dlv-command-name "dlv"
"File name for executing the Go Delve debugger.
This should be an executable on your path, or an absolute file name."
:type 'string
:group 'gud)
;;;###autoload
(defun dlv (command-line)
"Run dlv on program FILE in buffer `*gud-FILE*'.
The directory containing FILE becomes the initial working directory
and source-file directory for your debugger."
(interactive
(list (gud-query-cmdline 'dlv "debug")))
(gud-common-init command-line nil 'go-dlv-marker-filter)
(set (make-local-variable 'gud-minor-mode) 'dlv)
(gud-def gud-break "break %d%f:%l" "\C-b" "Set breakpoint at current line.")
(gud-def gud-trace "trace %d%f:%l" "\C-t" "Set trace at current line.")
(gud-def gud-remove "clearall %d%f:%l" "\C-d" "Remove breakpoint at current line")
(gud-def gud-step "step" "\C-s" "Step one source line with display.")
(gud-def gud-finish "stepout" "\C-f" "Finish executing current function.")
(gud-def gud-next "next" "\C-n" "Step one line (skip functions).")
(gud-def gud-cont "continue" "\C-r" "Continue running program.")
(gud-def gud-until "continue %d%f:%l" "\C-u" "Continue to current line.")
(gud-def gud-print "print %e" "\C-p" "Evaluate Go expression at point.")
(gud-def gud-watch "display -a %e" "\C-w" "Print expression at point on every step.")
(gud-def gud-up "up %p" "<" "Up N stack frames (numeric arg).")
(gud-def gud-down "down %p" ">" "Down N stack frames (numeric arg).")
(setq comint-prompt-regexp "^(Dlv) *")
(setq paragraph-start comint-prompt-regexp)
(run-hooks 'go-dlv-mode-hook))
;;;###autoload
(defun dlv-current-func ()
"Debug the current program or test stopping at the beginning of the current function."
(interactive)
(let (current-test-name current-bench-name current-func-loc)
;; find the location of the current function and (if it is a test function) its name
(save-excursion
(when (go-beginning-of-defun)
(setq current-func-loc (format "%s:%d" buffer-file-name (line-number-at-pos)))
;; Check for Test or Benchmark function, set current-test-name/current-bench-name
(when (looking-at go-func-regexp)
(let ((func-name (match-string 1)))
(when (string-match-p "_test\.go$" buffer-file-name)
(cond
((string-match-p "^Test\\|^Example" func-name)
(setq current-test-name func-name))
((string-match-p "^Benchmark" func-name)
(setq current-bench-name func-name))))))))
(if current-func-loc
(let (gud-buffer-name dlv-command)
(cond
(current-test-name
(setq gud-buffer-name "*gud-test*")
(setq dlv-command (concat gud-dlv-command-name " test -- -test.run " current-test-name)))
(current-bench-name
(setq gud-buffer-name "*gud-test*")
(setq dlv-command (concat gud-dlv-command-name " test -- -test.run='^$' -test.bench=" current-bench-name)))
(t
(setq gud-buffer-name "*gud-debug*")
(setq dlv-command (concat gud-dlv-command-name " debug"))))
;; stop the current active dlv session if any
(let ((gud-buffer (get-buffer gud-buffer-name)))
(when gud-buffer (kill-buffer gud-buffer)))
;; run dlv and stop at the beginning of the current function
(dlv dlv-command)
(gud-call (format "break %s" current-func-loc))
(gud-call "continue"))
(error "Not in function"))))
(provide 'go-dlv)
;;; go-dlv.el ends here