Shrink struct vectorlike_header to the only size field.

* lisp.h (enum pvec_type): Avoid explicit enum member values.
Adjust comment.
(enum More_Lisp_Bits): Change PSEUDOVECTOR_SIZE_BITS and
PVEC_TYPE_MASK to arrange new bitfield in the vector header.
(PSEUDOVECTOR_REST_BITS, PSEUDOVECTOR_REST_MASK): New members.
(PSEUDOVECTOR_AREA_BITS): New member used to extract subtype
information from the vector header.  Adjust comment.
(XSETPVECTYPE, XSETPVECTYPESIZE, XSETTYPED_PSEUDOVECTOR)
(PSEUDOVECTOR_TYPEP, DEFUN): Adjust to match new vector header
layout.
(XSETSUBR, SUBRP): Adjust to match new Lisp_Subr layout.
(struct vectorlike_header): Remove next member.  Adjust comment.
(struct Lisp_Subr): Add convenient header.  Adjust comment.
(allocate_pseudovector): Adjust prototype.
* alloc.c (mark_glyph_matrix, mark_face_cache, allocate_string)
(sweep_string, lisp_malloc): Remove useless prototypes.
(enum mem_type): Adjust comment.
(NEXT_IN_FREE_LIST): New macro.
(SETUP_ON_FREE_LIST): Adjust XSETPVECTYPESIZE usage.
(Fmake_bool_vector): Likewise.
(struct large_vector): New type to represent allocation unit for
the vectors with the memory footprint more than VBLOOCK_BYTES_MAX.
(large_vectors): Change type to struct large_vector.
(allocate_vector_from_block): Simplify.
(PSEUDOVECTOR_NBYTES): Replace with...
(vector_nbytes): ...new function.  Adjust users.
(sweep_vectors): Adjust processing of large vectors.
(allocate_vectorlike): Likewise.
(allocate_pseudovector): Change type of 3rd arg to enum pvec_type.
Add easserts.  Adjust XSETPVECTYPESIZE usage.
(allocate_buffer): Use BUFFER_PVEC_INIT.
(live_vector_p): Adjust to match large vector.
* buffer.c (init_buffer_once): Use BUFFER_PVEC_INIT.
* buffer.h (struct buffer): Add next member.
(BUFFER_LISP_SIZE, BUFFER_REST_SIZE, BUFFER_PVEC_INIT):
New macros.
(FOR_EACH_BUFFER): Adjust to match struct buffer change.
* fns.c (internal_equal): Adjust to match enum pvec_type change.
(copy_hash_table): Adjust to match vector header change.
* lread.c (defsubr): Use XSETPVECTYPE.
* .gdbinit (xpr, xbacktrace): Adjust to match vector header change.
(xvectype): Likewise.  Print PVEC_NORMAL_VECTOR for regular vectors.
(xvecsize): New command.

1 files changed, 2 insertions, 7 deletions

diff --git a/src/buffer.c b/src/buffer.c
index bb69675346a..1d58df54f6f 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -5105,11 +5105,6 @@ void
 init_buffer_once (void)
 {
   int idx;
-  /* If you add, remove, or reorder Lisp_Objects in a struct buffer, make
-     sure that this is still correct.  Otherwise, mark_vectorlike may not
-     trace all Lisp_Objects in buffer_defaults and buffer_local_symbols.  */
-  const int pvecsize
-    = (offsetof (struct buffer, own_text) - header_size) / word_size;
 
   memset (buffer_permanent_local_flags, 0, sizeof buffer_permanent_local_flags);
 
@@ -5132,8 +5127,8 @@ init_buffer_once (void)
   /* This is not strictly necessary, but let's make them initialized.  */
   bset_name (&buffer_defaults, build_pure_c_string (" *buffer-defaults*"));
   bset_name (&buffer_local_symbols, build_pure_c_string (" *buffer-local-symbols*"));
-  XSETPVECTYPESIZE (&buffer_defaults, PVEC_BUFFER, pvecsize);
-  XSETPVECTYPESIZE (&buffer_local_symbols, PVEC_BUFFER, pvecsize);
+  BUFFER_PVEC_INIT (&buffer_defaults);
+  BUFFER_PVEC_INIT (&buffer_local_symbols);
 
   /* Set up the default values of various buffer slots.  */
   /* Must do these before making the first buffer! */