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From: Yuan Fu <casouri@gmail.com>
To: 40268@debbugs.gnu.org
Subject: bug#40268: 27.0.60; [PATCH] Unify and improve gdb-mi source window display
Date: Sat, 28 Mar 2020 00:03:21 -0400	[thread overview]
Message-ID: <63AC5BC7-CFFC-42DF-AD76-3414B631A6DE@gmail.com> (raw)

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Before this change, stepping and other gdb command handlers use 'gud-display-line’ and 'gdb-goto-breakpoint' uses 'gdb-display-source-buffer'.  Now whenever gdb-mi code tries to open a source buffer, 'gdb-display-source-buffer’ is used.  Also, we simplify the logic in 'gdb-display-source-buffer’ and add a feature to limit the maximum number of source windows.

From a user’s perspective, this change solves two problems: 1. The behavior difference between jumping to break point and stepping (and other command) 2. Gdb-mi opening more windows than I wanted for displaying source files.

Yuan


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From ad34237cdc7c06e7edfcb593e8c732c6a040a7cb Mon Sep 17 00:00:00 2001
From: Yuan Fu <casouri@gmail.com>
Date: Tue, 21 Jan 2020 16:23:57 -0500
Subject: [PATCH] Unify and improve gdb-mi source buffer display logic

Unify the behavior of source buffer display for gdb-mi.  Before this
change, stepping and other gdb command handlers use 'gud-display-line'
and 'gdb-goto-breakpoint' uses 'gdb-display-source-buffer'.  Now whenever
gdb-mi code tries to open a source buffer, 'gdb-display-source-buffer'
is used.  Also, we simplify the logic in 'gdb-display-source-buffer' and
add a feature to limit the maximum number of source windows.

* lisp/progmodes/gdb-mi.el (gdb-source-window): Remove variable,
changed to 'gdb-source-window-list'.
(gdb-source-window-list, gdb-max-source-window-count): New variable.
(gdb-display-source-buffer-action,
gdb-max-source-window-count): New custom variable.
(gdb-init-1, gdb-setup-windows, gdb-restore-windows):
Use 'gdb-source-window' rather than 'gdb-source-window-list'.
(gdb-display-source-buffer): Use new logic.
(gdb-goto-breakpoint): Remove 'display-buffer'
and don't set 'gdb-source-buffer' anymore.
* lisp/progmodes/gud.el (gud-display-line): Remove 'display-buffer'
and don't set 'gdb-source-buffer' anymore.
---
 lisp/progmodes/gdb-mi.el | 65 +++++++++++++++++++++++++++++-----------
 lisp/progmodes/gud.el    | 26 ++++++++--------
 2 files changed, 60 insertions(+), 31 deletions(-)

diff --git a/lisp/progmodes/gdb-mi.el b/lisp/progmodes/gdb-mi.el
index e4233dacaf..5f31a22f22 100644
--- a/lisp/progmodes/gdb-mi.el
+++ b/lisp/progmodes/gdb-mi.el
@@ -211,7 +211,9 @@ gdb-handler-list
 (defvar gdb-source-file-list nil
   "List of source files for the current executable.")
 (defvar gdb-first-done-or-error t)
-(defvar gdb-source-window nil)
+(defvar gdb-source-window-list nil
+  "List of windows used for displaying source files.
+Sorted in most recently visited first order.")
 (defvar gdb-inferior-status nil)
 (defvar gdb-continuation nil)
 (defvar gdb-supports-non-stop nil)
@@ -589,6 +591,21 @@ gdb-show-main
   :group 'gdb
   :version "22.1")
 
+(defcustom gdb-display-source-buffer-action nil
+  "`display-buffer' action used when GDB displaying a source buffer."
+  :type 'list
+  :group 'gdb
+  :version "28.1")
+
+(defcustom gdb-max-source-window-count 1
+  "Maximum number of source windows to use.
+Until there are such number of source windows on screen, GDB
+tries to open a new window when visiting a new source file; if
+there are, GDB will start to reuse existing source windows."
+  :type 'number
+  :grou 'gdb
+  :version "28.1")
+
 (defvar gdbmi-debug-mode nil
   "When non-nil, print the messages sent/received from GDB/MI in *Messages*.")
 
@@ -922,7 +939,7 @@ gdb-init-1
 	gdb-first-done-or-error t
 	gdb-buffer-fringe-width (car (window-fringes))
 	gdb-debug-log nil
-	gdb-source-window nil
+	gdb-source-window-list nil
 	gdb-inferior-status nil
 	gdb-continuation nil
         gdb-buf-publisher '()
@@ -2002,17 +2019,31 @@ gdb-show-stop-p
 ;; GDB frame (after up, down etc).  If no GDB frame is visible but the last
 ;; visited breakpoint is, use that window.
 (defun gdb-display-source-buffer (buffer)
-  (let* ((last-window (if gud-last-last-frame
-                          (get-buffer-window
-                           (gud-find-file (car gud-last-last-frame)))))
-	 (source-window (or last-window
-			    (if (and gdb-source-window
-				     (window-live-p gdb-source-window))
-				gdb-source-window))))
-    (when source-window
-      (setq gdb-source-window source-window)
-      (set-window-buffer source-window buffer))
-    source-window))
+  "Find a window to display BUFFER.
+Always find a window to display buffer, and return it."
+  ;; This function doesn't take care of setting up source window(s) at startup,
+  ;; that's handled by `gdb-setup-windows' (if `gdb-many-windows' is non-nil).
+  ;; If `buffer' is already shown in a window, use that window.
+  (or (get-buffer-window buffer)
+      (progn
+        ;; First, update the window list.
+        (setq gdb-source-window-list
+              (cl-remove-if-not #'window-live-p
+                                gdb-source-window-list))
+        ;; Should we create a new window or reuse one?
+        (if (> gdb-max-source-window-count
+               (length gdb-source-window-list))
+            ;; Create a new window, push it to window list and return it.
+            (car (push (display-buffer buffer gdb-display-source-buffer-action)
+                       gdb-source-window-list))
+          ;; Reuse a window, we use the oldest window and put that to
+          ;; the front of the window list.
+          (let ((last-win (car (last gdb-source-window-list)))
+                (rest (butlast gdb-source-window-list)))
+            (set-window-buffer last-win buffer)
+            (setq gdb-source-window-list
+                  (cons last-win rest))
+            last-win)))))
 
 
 (defun gdbmi-start-with (str offset match)
@@ -3981,9 +4012,7 @@ gdb-goto-breakpoint
               (let* ((buffer (find-file-noselect
                               (if (file-exists-p file) file
                                 (cdr (assoc bptno gdb-location-alist)))))
-                     (window (or (gdb-display-source-buffer buffer)
-                                 (display-buffer buffer))))
-                (setq gdb-source-window window)
+                     (window (gdb-display-source-buffer buffer)))
                 (with-current-buffer buffer
                   (goto-char (point-min))
                   (forward-line (1- (string-to-number line)))
@@ -4597,7 +4626,7 @@ gdb-setup-windows
          ;; Put buffer list in window if we
          ;; can't find a source file.
          (list-buffers-noselect))))
-    (setq gdb-source-window (selected-window))
+    (setq gdb-source-window-list (list (selected-window)))
     (let ((win4 (split-window-right)))
       (gdb-set-window-buffer
        (gdb-get-buffer-create 'gdb-inferior-io) nil win4))
@@ -4639,7 +4668,7 @@ gdb-restore-windows
          (if gud-last-last-frame
              (gud-find-file (car gud-last-last-frame))
            (gud-find-file gdb-main-file)))
-        (setq gdb-source-window win)))))
+        (setq gdb-source-window-list (list win))))))
 
 ;; Called from `gud-sentinel' in gud.el:
 (defun gdb-reset ()
diff --git a/lisp/progmodes/gud.el b/lisp/progmodes/gud.el
index 567f452b93..dda7fd6ef0 100644
--- a/lisp/progmodes/gud.el
+++ b/lisp/progmodes/gud.el
@@ -2826,9 +2826,11 @@ gud-display-line
 	 (buffer
 	  (with-current-buffer gud-comint-buffer
 	    (gud-find-file true-file)))
-	 (window (and buffer
-		      (or (get-buffer-window buffer)
-			  (display-buffer buffer '(nil (inhibit-same-window . t))))))
+	 (window (when buffer (if (eq gud-minor-mode 'gdb-mi)
+                                  (gdb-display-source-buffer buffer)
+                                ;; Gud still has the old behavior.
+                                (or (get-buffer-window buffer)
+                                    (display-buffer buffer '(nil (inhibit-same-window . t)))))))
 	 (pos))
     (when buffer
       (with-current-buffer buffer
@@ -2858,9 +2860,7 @@ gud-display-line
 	       (widen)
 	       (goto-char pos))))
       (when window
-	(set-window-point window gud-overlay-arrow-position)
-	(if (eq gud-minor-mode 'gdbmi)
-	    (setq gdb-source-window window))))))
+	(set-window-point window gud-overlay-arrow-position)))))
 
 ;; The gud-call function must do the right thing whether its invoking
 ;; keystroke is from the GUD buffer itself (via major-mode binding)
@@ -2908,14 +2908,14 @@ gud-format-command
 	  (setq subst
                 (gud-find-class
                  (if insource
-                      (buffer-file-name)
-                    (car frame))
+                     (buffer-file-name)
+                   (car frame))
                  (if insource
-                      (save-restriction
-                        (widen)
-                        (+ (count-lines (point-min) (point))
-                           (if (bolp) 1 0)))
-                    (cdr frame)))))
+                     (save-restriction
+                       (widen)
+                       (+ (count-lines (point-min) (point))
+                          (if (bolp) 1 0)))
+                   (cdr frame)))))
 	 ((eq key ?p)
 	  (setq subst (if arg (int-to-string arg)))))
 	(setq result (concat result (match-string 1 str) subst)))
-- 
2.25.1


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             reply	other threads:[~2020-03-28  4:03 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <310914cd-1822-3fe9-19ae-6e47f8e72072@gmx.at>
2020-03-28  4:03 ` Yuan Fu [this message]
2020-03-29  9:01   ` bug#40268: 27.0.60; [PATCH] Unify and improve gdb-mi source window display martin rudalics
2020-03-29 17:27     ` Yuan Fu
2020-03-31  9:15       ` martin rudalics
2020-04-04 20:29         ` Yuan Fu
2020-04-06  9:04           ` martin rudalics
2020-04-06 14:21             ` Yuan Fu
2020-04-14  1:09   ` bug#40268: Fwd: " Yuan Fu

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