From e019c35df60a306750e1025db99c36701a726ecb Mon Sep 17 00:00:00 2001 From: Paul Eggert Date: Fri, 15 Dec 2017 09:07:52 -0800 Subject: [PATCH] FOR_EACH_FRAME no longer assumes frame-list This cleans up a recent fix related to Bug#29661. Suggested by Stefan Monnier in: https://lists.gnu.org/r/emacs-devel/2017-12/msg00544.html * src/frame.c (next_frame, prev_frame, delete_frame): Restore debugging checks that Vframe_list is non-nil, as FOR_EACH_FRAME no longer has these checks. (delete_frame): Remove no-longer-needed checks that Vframe_list is non-nil, as FOR_EACH_FRAME no longer assumes that. * src/frame.h (FOR_EACH_FRAME): Do not assume Vframe_list is non-nil. --- src/frame.c | 13 ++++++++----- src/frame.h | 5 ++--- 2 files changed, 10 insertions(+), 8 deletions(-) diff --git a/src/frame.c b/src/frame.c index 66d1b5c759e..63fa8abb7da 100644 --- a/src/frame.c +++ b/src/frame.c @@ -1607,6 +1607,8 @@ next_frame (Lisp_Object frame, Lisp_Object minibuf) Lisp_Object f, tail; int passed = 0; + eassume (CONSP (Vframe_list)); + while (passed < 2) FOR_EACH_FRAME (tail, f) { @@ -1629,6 +1631,8 @@ prev_frame (Lisp_Object frame, Lisp_Object minibuf) { Lisp_Object f, tail, prev = Qnil; + eassume (CONSP (Vframe_list)); + FOR_EACH_FRAME (tail, f) { if (EQ (frame, f) && !NILP (prev)) @@ -1914,6 +1918,7 @@ delete_frame (Lisp_Object frame, Lisp_Object force) if (f == sf) { Lisp_Object tail; + eassume (CONSP (Vframe_list)); /* Look for another visible frame on the same terminal. Do not call next_frame here because it may loop forever. @@ -2058,7 +2063,7 @@ delete_frame (Lisp_Object frame, Lisp_Object force) /* If we've deleted the last_nonminibuf_frame, then try to find another one. */ - if (f == last_nonminibuf_frame && !NILP (Vframe_list)) + if (f == last_nonminibuf_frame) { last_nonminibuf_frame = 0; @@ -2076,7 +2081,7 @@ delete_frame (Lisp_Object frame, Lisp_Object force) /* If there's no other frame on the same kboard, get out of single-kboard state if we're in it for this kboard. */ - if (kb != NULL && !NILP (Vframe_list)) + if (kb != NULL) { /* Some frame we found on the same kboard, or nil if there are none. */ Lisp_Object frame_on_same_kboard = Qnil; @@ -2093,9 +2098,7 @@ delete_frame (Lisp_Object frame, Lisp_Object force) /* If we've deleted this keyboard's default_minibuffer_frame, try to find another one. Prefer minibuffer-only frames, but also notice frames with other windows. */ - if (kb != NULL - && EQ (frame, KVAR (kb, Vdefault_minibuffer_frame)) - && !NILP (Vframe_list)) + if (kb != NULL && EQ (frame, KVAR (kb, Vdefault_minibuffer_frame))) { /* The last frame we saw with a minibuffer, minibuffer-only or not. */ Lisp_Object frame_with_minibuf = Qnil; diff --git a/src/frame.h b/src/frame.h index a3b77636435..a5d4e4fc88b 100644 --- a/src/frame.h +++ b/src/frame.h @@ -1149,8 +1149,7 @@ default_pixels_per_inch_y (void) /* FOR_EACH_FRAME (LIST_VAR, FRAME_VAR) followed by a statement is a `for' loop which iterates over the elements of Vframe_list. The loop will set FRAME_VAR, a Lisp_Object, to each frame in - Vframe_list in succession and execute the statement. Vframe_list - should be nonempty, so the body is executed at least once. LIST_VAR + Vframe_list in succession and execute the statement. LIST_VAR should be a Lisp_Object too; it is used to iterate through the Vframe_list. Note that this macro walks over child frames and the tooltip frame as well. @@ -1160,7 +1159,7 @@ default_pixels_per_inch_y (void) something which executes the statement once. */ #define FOR_EACH_FRAME(list_var, frame_var) \ - for ((list_var) = (eassume (CONSP (Vframe_list)), Vframe_list); \ + for ((list_var) = Vframe_list; \ (CONSP (list_var) \ && (frame_var = XCAR (list_var), true)); \ list_var = XCDR (list_var)) -- 2.39.2