Merge from trunk; up to 2013-02-18T01:30:27Z!monnier@iro.umontreal.ca.

1 files changed, 83 insertions, 97 deletions

diff --git a/src/buffer.c b/src/buffer.c
index 6e2191dc22f..aa3fcf8c234 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -1,6 +1,7 @@
 /* Buffer manipulation primitives for GNU Emacs.
 
-Copyright (C) 1985-1989, 1993-1995, 1997-2012 Free Software Foundation, Inc.
+Copyright (C) 1985-1989, 1993-1995, 1997-2013 Free Software Foundation,
+Inc.
 
 This file is part of GNU Emacs.
 
@@ -371,9 +372,6 @@ bset_zv_marker (struct buffer *b, Lisp_Object val)
   b->INTERNAL_FIELD (zv_marker) = val;
 }
 
-/* For debugging; temporary.  See set_buffer_internal.  */
-/* Lisp_Object Qlisp_mode, Vcheck_symbol; */
-
 void
 nsberror (Lisp_Object spec)
 {
@@ -547,6 +545,8 @@ even if it is dead.  The return value is never nil.  */)
   b->base_buffer = NULL;
   /* No one shares the text with us now.  */
   b->indirections = 0;
+  /* No one shows us now.  */
+  b->window_count = 0;
 
   BUF_GAP_SIZE (b) = 20;
   block_input ();
@@ -573,6 +573,7 @@ even if it is dead.  The return value is never nil.  */)
   BUF_CHARS_MODIFF (b) = 1;
   BUF_OVERLAY_MODIFF (b) = 1;
   BUF_SAVE_MODIFF (b) = 1;
+  BUF_COMPACT (b) = 1;
   set_buffer_intervals (b, NULL);
   BUF_UNCHANGED_MODIFIED (b) = 1;
   BUF_OVERLAY_UNCHANGED_MODIFIED (b) = 1;
@@ -794,6 +795,8 @@ CLONE nil means the indirect buffer's state is reset to default values.  */)
   b->indirections = -1;
   /* Notify base buffer that we share the text now.  */
   b->base_buffer->indirections++;
+  /* Always -1 for an indirect buffer.  */
+  b->window_count = -1;
 
   b->pt = b->base_buffer->pt;
   b->begv = b->base_buffer->begv;
@@ -1336,7 +1339,7 @@ DEFUN ("set-buffer-modified-p", Fset_buffer_modified_p, Sset_buffer_modified_p,
 A non-nil FLAG means mark the buffer modified.  */)
   (Lisp_Object flag)
 {
-  Lisp_Object fn, buffer, window;
+  Lisp_Object fn;
 
 #ifdef CLASH_DETECTION
   /* If buffer becoming modified, lock the file.
@@ -1389,9 +1392,7 @@ A non-nil FLAG means mark the buffer modified.  */)
      Ideally, I think there should be another mechanism for fontifying
      buffers without "modifying" buffers, or redisplay should be
      smarter about updating the `*' in mode lines.  --gerd  */
-  XSETBUFFER (buffer, current_buffer);
-  window = Fget_buffer_window (buffer, Qt);
-  if (WINDOWP (window))
+  if (buffer_window_count (current_buffer))
     {
       ++update_mode_lines;
       current_buffer->prevent_redisplay_optimizations_p = 1;
@@ -1665,7 +1666,7 @@ compact_buffer (struct buffer *buffer)
      which aren't changed since last compaction.  */
   if (BUFFER_LIVE_P (buffer)
       && (buffer->base_buffer == NULL)
-      && (buffer->text->compact != buffer->text->modiff))
+      && (BUF_COMPACT (buffer) != BUF_MODIFF (buffer)))
     {
       /* If a buffer's undo list is Qt, that means that undo is
          turned off in that buffer.  Calling truncate_undo_list on
@@ -1678,19 +1679,15 @@ compact_buffer (struct buffer *buffer)
       if (!buffer->text->inhibit_shrinking)
         {
           /* If a buffer's gap size is more than 10% of the buffer
-             size, or larger than 2000 bytes, then shrink it
-             accordingly.  Keep a minimum size of 20 bytes.  */
-          int size = min (2000, max (20, (buffer->text->z_byte / 10)));
-
-          if (buffer->text->gap_size > size)
-            {
-              struct buffer *save_current = current_buffer;
-              current_buffer = buffer;
-              make_gap (-(buffer->text->gap_size - size));
-              current_buffer = save_current;
-            }
+             size, or larger than GAP_BYTES_DFL bytes, then shrink it
+             accordingly.  Keep a minimum size of GAP_BYTES_MIN bytes.  */
+          ptrdiff_t size = clip_to_bounds (GAP_BYTES_MIN,
+                                           BUF_Z_BYTE (buffer) / 10,
+                                           GAP_BYTES_DFL);
+          if (BUF_GAP_SIZE (buffer) > size)
+            make_gap_1 (buffer, -(BUF_GAP_SIZE (buffer) - size));
         }
-      buffer->text->compact = buffer->text->modiff;
+      BUF_COMPACT (buffer) = BUF_MODIFF (buffer);
     }
 }
 
@@ -1929,10 +1926,16 @@ cleaning up all windows currently displaying the buffer to be killed. */)
       eassert (b->indirections == -1);
       b->base_buffer->indirections--;
       eassert (b->base_buffer->indirections >= 0);
+      /* Make sure that we wasn't confused.  */
+      eassert (b->window_count == -1);
     }
   else
-    /* No one shares our buffer text, can free it.  */
-    free_buffer_text (b);
+    {
+      /* Make sure that no one shows us.  */
+      eassert (b->window_count == 0);
+      /* No one shares our buffer text, can free it.  */
+      free_buffer_text (b);
+    }
 
   if (b->newline_cache)
     {
@@ -2039,7 +2042,7 @@ DEFUN ("bury-buffer-internal", Fbury_buffer_internal, Sbury_buffer_internal,
 DEFUN ("set-buffer-major-mode", Fset_buffer_major_mode, Sset_buffer_major_mode, 1, 1, 0,
        doc: /* Set an appropriate major mode for BUFFER.
 For the *scratch* buffer, use `initial-major-mode', otherwise choose a mode
-according to `default-major-mode'.
+according to the default value of `major-mode'.
 Use this function before selecting the buffer, since it may need to inspect
 the current buffer's major mode.  */)
   (Lisp_Object buffer)
@@ -2681,10 +2684,11 @@ current buffer is cleared.  */)
 
   UNGCPRO;
 
-  /* Changing the multibyteness of a buffer means that all windows
-     showing that buffer must be updated thoroughly.  */
   current_buffer->prevent_redisplay_optimizations_p = 1;
-  ++windows_or_buffers_changed;
+
+  /* If buffer is shown in a window, let redisplay consider other windows.  */
+  if (buffer_window_count (current_buffer))
+    ++windows_or_buffers_changed;
 
   /* Copy this buffer's new multibyte status
      into all of its indirect buffers.  */
@@ -3147,7 +3151,10 @@ ptrdiff_t
 sort_overlays (Lisp_Object *overlay_vec, ptrdiff_t noverlays, struct window *w)
 {
   ptrdiff_t i, j;
-  struct sortvec *sortvec = alloca (noverlays * sizeof *sortvec);
+  USE_SAFE_ALLOCA;
+  struct sortvec *sortvec;
+
+  SAFE_NALLOCA (sortvec, 1, noverlays);
 
   /* Put the valid and relevant overlays into sortvec.  */
 
@@ -3193,6 +3200,8 @@ sort_overlays (Lisp_Object *overlay_vec, ptrdiff_t noverlays, struct window *w)
 
   for (i = 0; i < noverlays; i++)
     overlay_vec[i] = sortvec[i].overlay;
+
+  SAFE_FREE ();
   return (noverlays);
 }
 
@@ -3880,17 +3889,17 @@ modify_overlay (struct buffer *buf, ptrdiff_t start, ptrdiff_t end)
 
   BUF_COMPUTE_UNCHANGED (buf, start, end);
 
-  /* If this is a buffer not in the selected window,
-     we must do other windows.  */
-  if (buf != XBUFFER (XWINDOW (selected_window)->buffer))
-    windows_or_buffers_changed = 1;
-  /* If multiple windows show this buffer, we must do other windows.  */
-  else if (buffer_shared > 1)
-    windows_or_buffers_changed = 1;
-  /* If we modify an overlay at the end of the buffer, we cannot
-     be sure that window end is still valid.  */
-  else if (end >= ZV && start <= ZV)
-    windows_or_buffers_changed = 1;
+  /* If BUF is visible, consider updating the display if ...  */
+  if (buffer_window_count (buf) > 0)
+    {
+      /* ... it's visible in other window than selected,  */
+      if (buf != XBUFFER (XWINDOW (selected_window)->buffer))
+        windows_or_buffers_changed = 1;
+      /* ... or if we modify an overlay at the end of the buffer
+         and so we cannot be sure that window end is still valid.  */
+      else if (end >= ZV && start <= ZV)
+        windows_or_buffers_changed = 1;
+    }
 
   ++BUF_OVERLAY_MODIFF (buf);
 }
@@ -4569,27 +4578,7 @@ evaporate_overlays (ptrdiff_t pos)
   for (; CONSP (hit_list); hit_list = XCDR (hit_list))
     Fdelete_overlay (XCAR (hit_list));
 }
-
-/* Somebody has tried to store a value with an unacceptable type
-   in the slot with offset OFFSET.  */
-
-void
-buffer_slot_type_mismatch (Lisp_Object newval, int type)
-{
-  Lisp_Object predicate;
-
-  switch (type)
-    {
-    case_Lisp_Int:    predicate = Qintegerp; break;
-    case Lisp_String: predicate = Qstringp;  break;
-    case Lisp_Symbol: predicate = Qsymbolp;  break;
-    default: emacs_abort ();
-    }
-
-  wrong_type_argument (predicate, newval);
-}
 
-
 /***********************************************************************
                          Allocation with mmap
  ***********************************************************************/
@@ -5125,6 +5114,9 @@ init_buffer_once (void)
   /* No one will share the text with these buffers, but let's play it safe.  */
   buffer_defaults.indirections = 0;
   buffer_local_symbols.indirections = 0;
+  /* Likewise no one will display them.  */
+  buffer_defaults.window_count = 0;
+  buffer_local_symbols.window_count = 0;
   set_buffer_intervals (&buffer_defaults, NULL);
   set_buffer_intervals (&buffer_local_symbols, NULL);
   /* This is not strictly necessary, but let's make them initialized.  */
@@ -5360,25 +5352,23 @@ init_buffer (void)
   free (pwd);
 }
 
-/* Similar to defvar_lisp but define a variable whose value is the Lisp
-   Object stored in the current buffer.  address is the address of the slot
-   in the buffer that is current now. */
-
-/* TYPE is nil for a general Lisp variable.
-   An integer specifies a type; then only Lisp values
-   with that type code are allowed (except that nil is allowed too).
-   LNAME is the Lisp-level variable name.
-   VNAME is the name of the buffer slot.
-   DOC is a dummy where you write the doc string as a comment.  */
-#define DEFVAR_PER_BUFFER(lname, vname, type, doc)                      \
-  do {                                                                  \
-    static struct Lisp_Buffer_Objfwd bo_fwd;                            \
-    defvar_per_buffer (&bo_fwd, lname, vname, type);                    \
+/* Similar to defvar_lisp but define a variable whose value is the
+   Lisp_Object stored in the current buffer.  LNAME is the Lisp-level
+   variable name.  VNAME is the name of the buffer slot.  PREDICATE
+   is nil for a general Lisp variable.  If PREDICATE is non-nil, then
+   only Lisp values that satisfies the PREDICATE are allowed (except
+   that nil is allowed too).  DOC is a dummy where you write the doc
+   string as a comment.  */
+
+#define DEFVAR_PER_BUFFER(lname, vname, predicate, doc)         \
+  do {                                                          \
+    static struct Lisp_Buffer_Objfwd bo_fwd;                    \
+    defvar_per_buffer (&bo_fwd, lname, vname, predicate);       \
   } while (0)
 
 static void
 defvar_per_buffer (struct Lisp_Buffer_Objfwd *bo_fwd, const char *namestring,
-                   Lisp_Object *address, Lisp_Object type)
+                   Lisp_Object *address, Lisp_Object predicate)
 {
   struct Lisp_Symbol *sym;
   int offset;
@@ -5388,7 +5378,7 @@ defvar_per_buffer (struct Lisp_Buffer_Objfwd *bo_fwd, const char *namestring,
 
   bo_fwd->type = Lisp_Fwd_Buffer_Obj;
   bo_fwd->offset = offset;
-  bo_fwd->slottype = type;
+  bo_fwd->predicate = predicate;
   sym->declared_special = 1;
   sym->redirect = SYMBOL_FORWARDED;
   {
@@ -5651,7 +5641,7 @@ Decimal digits after the % specify field width to which to pad.  */);
                           doc: /* Value of `major-mode' for new buffers.  */);
 
   DEFVAR_PER_BUFFER ("major-mode", &BVAR (current_buffer, major_mode),
-                     make_number (Lisp_Symbol),
+                     Qsymbolp,
                      doc: /* Symbol for current buffer's major mode.
 The default value (normally `fundamental-mode') affects new buffers.
 A value of nil means to use the current buffer's major mode, provided
@@ -5682,17 +5672,17 @@ Use the command `abbrev-mode' to change this variable.  */);
                      doc: /* Non-nil if searches and matches should ignore case.  */);
 
   DEFVAR_PER_BUFFER ("fill-column", &BVAR (current_buffer, fill_column),
-                     make_number (Lisp_Int0),
+                     Qintegerp,
                      doc: /* Column beyond which automatic line-wrapping should happen.
 Interactively, you can set the buffer local value using \\[set-fill-column].  */);
 
   DEFVAR_PER_BUFFER ("left-margin", &BVAR (current_buffer, left_margin),
-                     make_number (Lisp_Int0),
+                     Qintegerp,
                      doc: /* Column for the default `indent-line-function' to indent to.
 Linefeed indents to this column in Fundamental mode.  */);
 
   DEFVAR_PER_BUFFER ("tab-width", &BVAR (current_buffer, tab_width),
-                     make_number (Lisp_Int0),
+                     Qintegerp,
                      doc: /* Distance between tab stops (for display of tab characters), in columns.
 This should be an integer greater than zero.  */);
 
@@ -5777,7 +5767,7 @@ visual lines rather than logical lines.  See the documentation of
 `visual-line-mode'.  */);
 
   DEFVAR_PER_BUFFER ("default-directory", &BVAR (current_buffer, directory),
-                     make_number (Lisp_String),
+                     Qstringp,
                      doc: /* Name of default directory of current buffer.  Should end with slash.
 To interactively change the default directory, use command `cd'.  */);
 
@@ -5790,18 +5780,18 @@ NOTE: This variable is not a hook;
 its value may not be a list of functions.  */);
 
   DEFVAR_PER_BUFFER ("buffer-file-name", &BVAR (current_buffer, filename),
-                     make_number (Lisp_String),
+                     Qstringp,
                      doc: /* Name of file visited in current buffer, or nil if not visiting a file.  */);
 
   DEFVAR_PER_BUFFER ("buffer-file-truename", &BVAR (current_buffer, file_truename),
-                     make_number (Lisp_String),
+                     Qstringp,
                      doc: /* Abbreviated truename of file visited in current buffer, or nil if none.
 The truename of a file is calculated by `file-truename'
 and then abbreviated with `abbreviate-file-name'.  */);
 
   DEFVAR_PER_BUFFER ("buffer-auto-save-file-name",
                      &BVAR (current_buffer, auto_save_file_name),
-                     make_number (Lisp_String),
+                     Qstringp,
                      doc: /* Name of file for auto-saving current buffer.
 If it is nil, that means don't auto-save this buffer.  */);
 
@@ -5813,7 +5803,7 @@ If it is nil, that means don't auto-save this buffer.  */);
 Backing up is done before the first time the file is saved.  */);
 
   DEFVAR_PER_BUFFER ("buffer-saved-size", &BVAR (current_buffer, save_length),
-                     make_number (Lisp_Int0),
+                     Qintegerp,
                      doc: /* Length of current buffer when last read in, saved or auto-saved.
 0 initially.
 -1 means auto-saving turned off until next real save.
@@ -5883,23 +5873,23 @@ In addition, a char-table has six extra slots to control the display of:
 See also the functions `display-table-slot' and `set-display-table-slot'.  */);
 
   DEFVAR_PER_BUFFER ("left-margin-width", &BVAR (current_buffer, left_margin_cols),
-                     Qnil,
+                     Qintegerp,
                      doc: /* Width of left marginal area for display of a buffer.
 A value of nil means no marginal area.  */);
 
   DEFVAR_PER_BUFFER ("right-margin-width", &BVAR (current_buffer, right_margin_cols),
-                     Qnil,
+                     Qintegerp,
                      doc: /* Width of right marginal area for display of a buffer.
 A value of nil means no marginal area.  */);
 
   DEFVAR_PER_BUFFER ("left-fringe-width", &BVAR (current_buffer, left_fringe_width),
-                     Qnil,
+                     Qintegerp,
                      doc: /* Width of this buffer's left fringe (in pixels).
 A value of 0 means no left fringe is shown in this buffer's window.
 A value of nil means to use the left fringe width from the window's frame.  */);
 
   DEFVAR_PER_BUFFER ("right-fringe-width", &BVAR (current_buffer, right_fringe_width),
-                     Qnil,
+                     Qintegerp,
                      doc: /* Width of this buffer's right fringe (in pixels).
 A value of 0 means no right fringe is shown in this buffer's window.
 A value of nil means to use the right fringe width from the window's frame.  */);
@@ -5910,7 +5900,7 @@ A value of nil means to use the right fringe width from the window's frame.  */)
 A value of nil means to display fringes between margins and buffer text.  */);
 
   DEFVAR_PER_BUFFER ("scroll-bar-width", &BVAR (current_buffer, scroll_bar_width),
-                     Qnil,
+                     Qintegerp,
                      doc: /* Width of this buffer's scroll bars in pixels.
 A value of nil means to use the scroll bar width from the window's frame.  */);
 
@@ -5990,7 +5980,7 @@ BITMAP is the corresponding fringe bitmap shown for the logical
 cursor type.  */);
 
   DEFVAR_PER_BUFFER ("scroll-up-aggressively",
-                     &BVAR (current_buffer, scroll_up_aggressively), Qnil,
+                     &BVAR (current_buffer, scroll_up_aggressively), Qfloatp,
                      doc: /* How far to scroll windows upward.
 If you move point off the bottom, the window scrolls automatically.
 This variable controls how far it scrolls.  The value nil, the default,
@@ -6003,7 +5993,7 @@ window scrolls by a full window height.  Meaningful values are
 between 0.0 and 1.0, inclusive.  */);
 
   DEFVAR_PER_BUFFER ("scroll-down-aggressively",
-                     &BVAR (current_buffer, scroll_down_aggressively), Qnil,
+                     &BVAR (current_buffer, scroll_down_aggressively), Qfloatp,
                      doc: /* How far to scroll windows downward.
 If you move point off the top, the window scrolls automatically.
 This variable controls how far it scrolls.  The value nil, the default,
@@ -6015,10 +6005,6 @@ simple case that you moved off with C-b means scrolling just one line.
 window scrolls by a full window height.  Meaningful values are
 between 0.0 and 1.0, inclusive.  */);
 
-/*DEFVAR_LISP ("debug-check-symbol", &Vcheck_symbol,
-    "Don't ask.");
-*/
-
   DEFVAR_LISP ("before-change-functions", Vbefore_change_functions,
                doc: /* List of functions to call before each text change.
 Two arguments are passed to each function: the positions of
@@ -6157,7 +6143,7 @@ then characters with property value PROP are invisible,
 and they have an ellipsis as well if ELLIPSIS is non-nil.  */);
 
   DEFVAR_PER_BUFFER ("buffer-display-count",
-                     &BVAR (current_buffer, display_count), Qnil,
+                     &BVAR (current_buffer, display_count), Qintegerp,
                      doc: /* A number incremented each time this buffer is displayed in a window.
 The function `set-window-buffer' increments it.  */);
 
@@ -6216,7 +6202,7 @@ cursor's appearance is instead controlled by the variable
 `cursor-in-non-selected-windows'.  */);
 
   DEFVAR_PER_BUFFER ("line-spacing",
-                     &BVAR (current_buffer, extra_line_spacing), Qnil,
+                     &BVAR (current_buffer, extra_line_spacing), Qnumberp,
                      doc: /* Additional space to put between lines when displaying a buffer.
 The space is measured in pixels, and put below lines on graphic displays,
 see `display-graphic-p'.