Basically, this makes the structure of buffer-local values and object
forwarding explicit in the type of Lisp_Symbols rather than use
special Lisp_Objects for that. This tends to lead to slightly more
verbose code, but is more C-like, simpler, and makes it easier to make
sure we handled all cases, among other things by letting the compiler
help us check it.
* lisp.h (enum Lisp_Misc_Type, union Lisp_Misc):
Removing forwarding objects.
(enum Lisp_Fwd_Type, enum symbol_redirect, union Lisp_Fwd): New types.
(struct Lisp_Symbol): Make the various forms of variable-forwarding
explicit rather than hiding them inside Lisp_Object "values".
(XFWDTYPE): New macro.
(XINTFWD, XBOOLFWD, XOBJFWD, XKBOARD_OBJFWD): Redefine.
(XBUFFER_LOCAL_VALUE): Remove.
(SYMBOL_VAL, SYMBOL_ALIAS, SYMBOL_BLV, SYMBOL_FWD, SET_SYMBOL_VAL)
(SET_SYMBOL_ALIAS, SET_SYMBOL_BLV, SET_SYMBOL_FWD): New macros.
(SYMBOL_VALUE, SET_SYMBOL_VALUE): Remove.
(struct Lisp_Intfwd, struct Lisp_Boolfwd, struct Lisp_Objfwd)
(struct Lisp_Buffer_Objfwd, struct Lisp_Kboard_Objfwd):
Remove the Lisp_Misc_* header.
(struct Lisp_Buffer_Local_Value): Redefine.
(BLV_FOUND, SET_BLV_FOUND, BLV_VALUE, SET_BLV_VALUE): New macros.
(struct Lisp_Misc_Any): Add filler to get the right size.
(struct Lisp_Free): Use struct Lisp_Misc_Any rather than struct
Lisp_Intfwd.
(DEFVAR_LISP, DEFVAR_LISP_NOPRO, DEFVAR_BOOL, DEFVAR_INT)
(DEFVAR_KBOARD): Allocate a forwarding object.
* data.c (do_blv_forwarding, store_blv_forwarding): New macros.
(let_shadows_global_binding_p): New function.
(union Lisp_Val_Fwd): New type.
(make_blv): New function.
(swap_in_symval_forwarding, indirect_variable, do_symval_forwarding)
(store_symval_forwarding, swap_in_global_binding, Fboundp)
(swap_in_symval_forwarding, find_symbol_value, Fset)
(let_shadows_buffer_binding_p, set_internal, default_value)
(Fset_default, Fmake_variable_buffer_local, Fmake_local_variable)
(Fkill_local_variable, Fmake_variable_frame_local)
(Flocal_variable_p, Flocal_variable_if_set_p)
(Fvariable_binding_locus):
* xdisp.c (select_frame_for_redisplay):
* lread.c (Fintern, Funintern, init_obarray, defvar_int)
(defvar_bool, defvar_lisp_nopro, defvar_lisp, defvar_kboard):
* frame.c (store_frame_param):
* eval.c (Fdefvaralias, Fuser_variable_p, specbind, unbind_to):
* bytecode.c (Fbyte_code) <varref, varset>: Adapt to the new symbol
value structure.
* buffer.c (PER_BUFFER_SYMBOL): Move from buffer.h.
(clone_per_buffer_values): Only adjust markers into the current buffer.
(reset_buffer_local_variables): PER_BUFFER_IDX is never -2.
(Fbuffer_local_value, set_buffer_internal_1)
(swap_out_buffer_local_variables):
Adapt to the new symbol value structure.
(DEFVAR_PER_BUFFER): Allocate a Lisp_Buffer_Objfwd object.
(defvar_per_buffer): Take a new arg for the fwd object.
(buffer_lisp_local_variables): Return a proper alist (different fix
for bug#4138).
* alloc.c (Fmake_symbol): Use SET_SYMBOL_VAL.
(Fgarbage_collect): Don't handle buffer_defaults specially.
(mark_object): Handle new symbol value structure rather than the old
special Lisp_Misc_* objects.
(gc_sweep) <symbols>: Free also the buffer-local-value objects.
* term.c (set_tty_color_mode):
* bidi.c (bidi_initialize): Don't access the ->value field directly.
* buffer.h (PER_BUFFER_VAR_OFFSET): Don't bother with
a buffer_local_flags.
* print.c (print_object): Get rid of impossible forwarding objects.
* buffer.h (struct buffer): New field modtime_size.
* buffer.c (reset_buffer): Initialize it.
* fileio.c (Finsert_file_contents, Fwrite_region): Set it.
(Fverify_visited_file_modtime): Check it.
(Fclear_visited_file_modtime, Fset_visited_file_modtime): Clear it.
(Fset_visited_file_modtime): Set (or clear) it.
* buffer.c (Fset_buffer_modified_p): Try and be careful not to modify
recent-auto-save-p as a side-effect.
* buffer.h (BUF_AUTOSAVE_MODIFF): New macro.
* buffer.c (Fkill_buffer, reset_buffer):
* editfns.c (Fsubst_char_in_region):
* fileio.c (Finsert_file_contents, Fdo_auto_save)
(Fset_buffer_auto_saved, Frecent_auto_save_p): Use it.
Fix reordering of Arabic text in etc/HELLO.
Extend .gdbinit commands to support bidirectional display.
buffer.c (Fbuffer_swap_text): Swap the values of
bidi_display_reordering and bidi_paragraph_direction.
bidi.c (bidi_resolve_weak): Fix nesting of conditions for Wn
processing. Move W3 after W1 and W2. Simplify W4 because it is
now always after W1.
.gdbinit (pbiditype): New command.
(pgx): Use it to display bidi level and type of the glyph.
Resurrect support for integer values of `cursor' property.
Rename paragraph-direction to bidi-paragraph-direction.
xdisp.c (init_iterator, text_outside_line_unchanged_p)
(try_window_id): Rename paragraph_direction to
bidi_paragraph_direction.
(set_cursor_from_row): Handle integer values of `cursor' property
on display strings.
buffer.c (init_buffer_once, syms_of_buffer): Rename
paragraph_direction to bidi_paragraph_direction.
buffer.h (struct buffer): Rename paragraph_direction to
bidi_paragraph_direction.
Finish up working on paragraph's base direction.
Start working on display of right-to-left glyph rows.
Rewrite set_cursor_from_row to support bidi.
xdisp.c (string_buffer_position_lim): New function.
(string_buffer_position): Most of code moved to
string_buffer_position_lim. Last argument and return value are
now EMACS_INT; all callers changed.
(set_cursor_from_row): Rewritten to support bidirectional text and
reversed glyph rows.
dispextern.h <string_buffer_position>: Update prototype.
bidi.c (bidi_paragraph_init): Fix initialization of POS.
dispextern.h (struct glyph_row): New member reversed_p.
buffer.c (syms_of_buffer): Remove DEFVAR_LISP_NOPRO for
default-direction-reversed, default-bidi-display-reordering, and
default-paragraph-direction.
Continue working on paragraph base direction.
Support per-buffer default paragraph direction.
buffer.h (struct buffer): New member paragraph_direction.
buffer.c (init_buffer_once): Initialize it.
(syms_of_buffer): Declare Lisp variables
default-paragraph-direction and paragraph-direction.
dispextern.h (struct it): New member paragraph_embedding.
xdisp.c (init_iterator): Initialize it from the buffer's value
of paragraph-direction.
<Qright_to_left, Qleft_to_right>: New variables.
(syms_of_xdisp): Initialize and staticpro them.
(set_iterator_to_next, next_element_from_buffer): Use the value of
paragraph_embedding to determine the paragraph direction.
bidi.c (bidi_line_init): Fix second argument to
bidi_set_sor_type.
(bidi_init_it): Initialize paragraph_dir to NEUTRAL_DIR.
(bidi_get_next_char_visually): Record the last character of the
separator in separator_limit, not the character after that.
(bidi_find_paragraph_start): Accept character and byte positions
instead of the whole iterator stricture. All callers changed.
Start of work on bidi Emacs 23/24.
bidi.c (bidi_initialize): Fix initialization of bidi_type_table.
xdisp.c (set_iterator_to_next): Fix position setting after call
to bidi_get_next_char_visually.
bidi.c: Include stdio.h unconditionally. Fix and elaborate
commentary. Add Copyright blurb.
* lisp.h (USE_2_TAGS_FOR_INTS): New macro.
(LISP_INT_TAG, case_Lisp_Int, LISP_STRING_TAG, LISP_INT_TAG_P): New macros.
(enum Lisp_Type): Use them. Give explicit values.
(Lisp_Type_Limit): Remove.
(XINT, XUINT, make_number) [!USE_LISP_UNION_TYPE]:
(MOST_NEGATIVE_FIXNUM, MOST_POSITIVE_FIXNUM, INTMASK):
Pay attention to USE_2_TAGS_FOR_INTS.
(INTEGERP): Use LISP_INT_TAG_P.
* fns.c (internal_equal): Simplify the default case.
(sxhash): Use case_Lisp_Int.
* data.c (wrong_type_argument): Don't check against Lisp_Type_Limit any more.
(Ftype_of): Use case_Lisp_Int.
(store_symval_forwarding): Take into account the fact that Ints can
now have more than one tag.
* buffer.c (syms_of_buffer): Use LISP_INT_TAG.
buffer_slot_type_mismatch):
* xfaces.c (face_attr_equal_p):
* print.c (print_object):
* alloc.c (mark_maybe_object, mark_object, survives_gc_p): Use case_Lisp_Int.
Rename arg "buffer" to "buffer_or_name".
(Fkill_buffer): Rename arg "buffer" to "buffer_or_name" and make
it optional.
(no_switch_window): Remove since the return value is not used.
(Fswitch_to_buffer): Rename arg "buffer" to "buffer_or_name".
Consider window as dedicated when Fwindow_dedicated_p returns a
non-nil value.
* data.c (indirect_variable, let_shadows_buffer_binding_p):
Use Lisp_Symbol pointers rather than Lisp_Object. Adjust callers.
* buffer.c (buffer_slot_type_mismatch): Use wrong-type-argument.
To this end, change calling-convention.
