1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
|
;;; dwarf-mode.el --- Browser for DWARF information.
;; Version: 1.1
;; This file is not part of GNU Emacs, but is distributed under the
;; same terms:
;; GNU Emacs 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.
;; GNU Emacs 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 GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
;;; Code:
(defvar dwarf-objdump-program "objdump")
(defconst dwarf-font-lock-keywords
'(
;; Name and linkage name.
("DW_AT_[a-z_]*name\\s *: .*:\\(.*\\)\\s *$"
(1 font-lock-function-name-face))
("Compilation Unit @ offset 0x[0-9a-f]+"
(0 font-lock-string-face))
))
(defvar dwarf-file nil
"Buffer-local variable holding the file name passed to objdump.")
;; Expand a "..." to show all the child DIES. NEW-DEPTH controls how
;; deep to display the new dies; `nil' means display all of them.
(defun dwarf-do-insert-substructure (new-depth die)
(let ((inhibit-read-only t))
(beginning-of-line)
(delete-region (point) (progn
(end-of-line)
(forward-char)
(point)))
(save-excursion
(apply #'call-process dwarf-objdump-program nil (current-buffer) nil
"-Wi" (concat "--dwarf-start=0x" die)
(expand-file-name dwarf-file)
(if new-depth (list (concat "--dwarf-depth="
(int-to-string new-depth))))))
(set-buffer-modified-p nil)))
(defun dwarf-insert-substructure-button (die)
(beginning-of-line)
(unless (looking-at "^ <\\([0-9]+\\)>")
(error "Unrecognized line."))
(let ((new-depth (1+ (string-to-number (match-string 1)))))
(dwarf-do-insert-substructure new-depth die)))
(defun dwarf-insert-substructure (arg)
"Expand a `...' to show children of the current DIE.
By default, expands just one level of children.
A prefix argument means expand all children."
(interactive "P")
(beginning-of-line)
(unless (looking-at "^ <\\([0-9]+\\)><\\([0-9a-f]+\\)>")
(error "Unrecognized line."))
(let ((die (match-string 2)))
(if arg
(dwarf-do-insert-substructure nil die)
(dwarf-insert-substructure-button die))))
;; Called when a button is pressed.
;; Either follows a DIE reference, or expands a "...".
(defun dwarf-die-button-action (button)
(let* ((die (button-get button 'die))
;; Note that the first number can only be decimal.
(die-rx (concat "^\\s *\\(<[0-9]+>\\)?<"
die ">[^<]"))
(old (point))
(is-ref (button-get button 'die-ref)))
(if is-ref
(progn
(goto-char (point-min))
(if (re-search-forward die-rx nil 'move)
(push-mark old)
(goto-char old)
(error "Could not find DIE <0x%s>" die)))
(dwarf-insert-substructure-button die))))
;; Button definition.
(define-button-type 'dwarf-die-button
'follow-link t
'action #'dwarf-die-button-action)
;; Helper regexp to match a DIE reference.
(defconst dwarf-die-reference ": \\(<0x\\([0-9a-f]+\\)>\\)\\s *$")
;; Helper regexp to match a `...' indicating that there are hidden
;; children.
(defconst dwarf-die-more "^ <[0-9]+><\\([0-9a-z]+\\)>: \\([.][.][.]\\)")
;; jit-lock callback function to fontify a region. This applies the
;; buttons, since AFAICT there is no good way to apply buttons via
;; font-lock.
(defun dwarf-fontify-region (start end)
(save-excursion
(let ((beg-line (progn (goto-char start) (line-beginning-position)))
(end-line (progn (goto-char end) (line-end-position))))
(goto-char beg-line)
(while (re-search-forward dwarf-die-reference end-line 'move)
(let ((b-start (match-beginning 1))
(b-end (match-end 1))
(hex (match-string-no-properties 2)))
(make-text-button b-start b-end :type 'dwarf-die-button
'die hex 'die-ref t)))
;; This is a bogus approach. Why can't we make buttons from the
;; font-lock defaults?
(goto-char beg-line)
(while (re-search-forward dwarf-die-more end-line 'move)
(let ((hex (match-string-no-properties 1))
(b-start (match-beginning 2))
(b-end (match-end 2)))
(make-text-button b-start b-end :type 'dwarf-die-button
'die hex 'die-ref nil))))))
;; Run objdump and insert the contents into the buffer. The arguments
;; are the way they are because this is also called as a
;; revert-buffer-function.
(defun dwarf-do-refresh (&rest ignore)
(let ((inhibit-read-only t))
(erase-buffer)
(save-excursion
(call-process dwarf-objdump-program
nil (current-buffer) nil
"-Wi" "--dwarf-depth=1"
(expand-file-name dwarf-file)))
(set-buffer-modified-p nil)))
;;;###autoload
(define-derived-mode dwarf-mode special-mode "DWARF"
"Major mode for browsing DWARF output.
\\{dwarf-mode-map}"
(set (make-local-variable 'font-lock-defaults) '(dwarf-font-lock-keywords))
;; FIXME: we could be smarter and check the file time.
(set (make-local-variable 'revert-buffer-function) #'dwarf-do-refresh)
(jit-lock-register #'dwarf-fontify-region))
(define-key dwarf-mode-map [(control ?m)] #'dwarf-insert-substructure)
;;;###autoload
(defun dwarf-browse (file)
"Invoke `objdump' and put output into a `dwarf-mode' buffer.
This is the main interface to `dwarf-mode'."
(interactive "fFile name: ")
(let* ((base-name (file-name-nondirectory file))
(buffer (generate-new-buffer (concat "*DWARF for " base-name "*"))))
(pop-to-buffer buffer)
(dwarf-mode)
(set (make-local-variable 'dwarf-file) file)
(dwarf-do-refresh)))
(provide 'dwarf-mode)
;;; dwarf-mode.el ends here
|
