Keep stack-allocated Lisp objects fast rather than versatile.

* configure.ac (HAVE_STATEMENT_EXPRESSIONS): Remove.
For USE_STACK_LISP_OBJECTS, we always assume __GNUC__.
* lisp.h (union Aligned_Cons) [!GCALIGNED]: Define as such.
(SCOPED_CONS_INITIALIZER): New macro.
(scoped_cons) [USE_STACK_LISP_OBJECTS]: Use it.
(USE_LOCAL_ALLOCA): Remove.
(local_cons, local_list1, local_list2, local_list3, local_list4):
Remove.  Stack overflow checking makes them too slow.
(make_local_vector): Likewise.  Also we just don't have enough
users for it.
(enum LISP_STRING_OVERHEAD): Remove.
(local_string_init, local_vector_init): Remove prototypes.
(make_local_string, build_local_string): Redesign to target short
compile-time string constants, fall back to regular string allocation
where appropriate.
(lisp_string_size): New function.
(verify_ascii) [ENABLE_CHECKING]: Add prototype.
* alloc.c (local_string_init, local_vector_init): Remove.
(verify_ascii) [ENABLE_CHECKING]: New function.
* buffer.c, charset.c, chartab.c, data.c, editfns.c, emacs.c, fileio.c:
* fns.c, font.c, fontset.c, frame.c, keyboard.c, keymap.c, lread.c:
* menu.c, minibuf.c, process.c, textprop.c, xdisp.c, xfns.c, xfont.c:
* xselect.c, xterm.c: All related users changed.

1 files changed, 0 insertions, 3 deletions

diff --git a/src/buffer.c b/src/buffer.c
index 591f585a7a9..39d08950bf8 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -1511,7 +1511,6 @@ list first, followed by the list of all buffers.  If no other buffer
 exists, return the buffer `*scratch*' (creating it if necessary).  */)
   (Lisp_Object buffer, Lisp_Object visible_ok, Lisp_Object frame)
 {
-  USE_LOCAL_ALLOCA;
   struct frame *f = decode_any_frame (frame);
   Lisp_Object tail = f->buffer_list, pred = f->buffer_predicate;
   Lisp_Object buf, notsogood = Qnil;
@@ -1570,7 +1569,6 @@ exists, return the buffer `*scratch*' (creating it if necessary).  */)
 Lisp_Object
 other_buffer_safely (Lisp_Object buffer)
 {
-  USE_LOCAL_ALLOCA;
   Lisp_Object tail, buf;
 
   FOR_EACH_LIVE_BUFFER (tail, buf)
@@ -5240,7 +5238,6 @@ init_buffer_once (void)
 void
 init_buffer (int initialized)
 {
-  USE_LOCAL_ALLOCA;
   char *pwd;
   Lisp_Object temp;
   ptrdiff_t len;