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Re: External inline functions
From: |
Paul Eggert |
Subject: |
Re: External inline functions |
Date: |
Sun, 06 Nov 2011 13:20:07 -0800 |
User-agent: |
Mozilla/5.0 (X11; Linux i686; rv:7.0.1) Gecko/20110929 Thunderbird/7.0.1 |
Yes, that's right: pre-C99 'inline' is a portability minefield,
and GNU Emacs isn't portable even to C99's tricky semantics
for extern inline (among other things, extern inline functions
cannot call static functions).
I installed the following to work around the problems in this area that
I found. But as this issue keeps coming up, how about if we
simply stop using extern inline functions? They do not buy us
significant performance, and they are a hassle that is causing
portability problems, so this should be an easy call.
====
Fix some portability problems with 'inline'.
* dispextern.h (window_box, window_box_height, window_text_bottom_y)
(window_box_width, window_box_left, window_box_left_offset)
(window_box_right, window_box_right_offset): Declare extern.
Otherwise, these inline functions do not conform to C99 and
are miscompiled by Microsoft compilers. Reported by Eli Zaretskii in
<http://lists.gnu.org/archive/html/emacs-devel/2011-11/msg00084.html>.
* intervals.c (adjust_intervals_for_insertion)
(adjust_intervals_for_deletion): Now extern, because otherwise the
extern inline functions 'offset_intervals' couldn't refer to it.
(static_offset_intervals): Remove.
(offset_intervals): Rewrite using the old contents of
static_offset_intervals. The old version didn't conform to C99
because an extern inline function contained a reference to an
identifier with static linkage.
=== modified file 'src/dispextern.h'
--- src/dispextern.h 2011-10-25 16:36:20 +0000
+++ src/dispextern.h 2011-11-06 21:03:15 +0000
@@ -3006,14 +3006,14 @@
void set_vertical_scroll_bar (struct window *);
#endif
int try_window (Lisp_Object, struct text_pos, int);
-void window_box (struct window *, int, int *, int *, int *, int *);
-int window_box_height (struct window *);
-int window_text_bottom_y (struct window *);
-int window_box_width (struct window *, int);
-int window_box_left (struct window *, int);
-int window_box_left_offset (struct window *, int);
-int window_box_right (struct window *, int);
-int window_box_right_offset (struct window *, int);
+extern void window_box (struct window *, int, int *, int *, int *, int *);
+extern int window_box_height (struct window *);
+extern int window_text_bottom_y (struct window *);
+extern int window_box_width (struct window *, int);
+extern int window_box_left (struct window *, int);
+extern int window_box_left_offset (struct window *, int);
+extern int window_box_right (struct window *, int);
+extern int window_box_right_offset (struct window *, int);
int estimate_mode_line_height (struct frame *, enum face_id);
void pixel_to_glyph_coords (struct frame *, int, int, int *, int *,
NativeRectangle *, int);
=== modified file 'src/intervals.c'
--- src/intervals.c 2011-10-26 01:18:13 +0000
+++ src/intervals.c 2011-11-06 21:03:14 +0000
@@ -52,6 +52,11 @@
#define TMEM(sym, set) (CONSP (set) ? ! NILP (Fmemq (sym, set)) : ! NILP (set))
+extern INTERVAL adjust_intervals_for_insertion (INTERVAL,
+ EMACS_INT, EMACS_INT);
+extern void adjust_intervals_for_deletion (struct buffer *,
+ EMACS_INT, EMACS_INT);
+
static Lisp_Object merge_properties_sticky (Lisp_Object, Lisp_Object);
static INTERVAL merge_interval_right (INTERVAL);
static INTERVAL reproduce_tree (INTERVAL, INTERVAL);
@@ -798,7 +803,7 @@
and check the hungry bits of both. Then add the length going back up
to the root. */
-static INTERVAL
+INTERVAL
adjust_intervals_for_insertion (INTERVAL tree, EMACS_INT position,
EMACS_INT length)
{
@@ -859,7 +864,7 @@
interval. Another possibility would be to create a new interval for
this text, and make it have the merged properties of both ends. */
-static INTERVAL
+INTERVAL
adjust_intervals_for_insertion (INTERVAL tree,
EMACS_INT position, EMACS_INT length)
{
@@ -1369,7 +1374,7 @@
text. The deletion is effected at position START (which is a
buffer position, i.e. origin 1). */
-static void
+void
adjust_intervals_for_deletion (struct buffer *buffer,
EMACS_INT start, EMACS_INT length)
{
@@ -1425,9 +1430,8 @@
compiler that does not allow calling a static function (here,
adjust_intervals_for_deletion) from a non-static inline function. */
-static inline void
-static_offset_intervals (struct buffer *buffer, EMACS_INT start,
- EMACS_INT length)
+inline void
+offset_intervals (struct buffer *buffer, EMACS_INT start, EMACS_INT length)
{
if (NULL_INTERVAL_P (BUF_INTERVALS (buffer)) || length == 0)
return;
@@ -1440,12 +1444,6 @@
adjust_intervals_for_deletion (buffer, start, -length);
}
}
-
-inline void
-offset_intervals (struct buffer *buffer, EMACS_INT start, EMACS_INT length)
-{
- static_offset_intervals (buffer, start, length);
-}
/* Merge interval I with its lexicographic successor. The resulting
interval is returned, and has the properties of the original