Shrink Lisp_Sub_Char_Table by preferring C integers to Lisp_Objects.

* lisp.h (struct Lisp_Sub_Char_Table): Use C integers for depth and
min_char slots.  Adjust comment.
(enum char_table_specials): Rename from CHAR_TABLE_STANDARD_SLOTS.
Add SUB_CHAR_TABLE_OFFSET member.
(make_uninit_sub_char_table): New function.
* alloc.c (mark_char_table): Add extra argument to denote char table
subtype.  Adjust to match new layout of sub char-table.
(mark_object): Always mark sub char-tables with mark_char_table.
* chartab.c (make_sub_char_table, copy_sub_char_table)
(sub_char_table_ref, sub_char_table_ref_and_range, sub_char_table_set)
(sub_char_table_set_range, optimize_sub_char_table, map_sub_char_table)
(map_sub_char_table_for_charset, uniprop_table_uncompress):
All related users changed.
* lread.c (read1): Adjust to match new layout of sub char-table.

1 files changed, 17 insertions, 30 deletions

diff --git a/src/chartab.c b/src/chartab.c
index 4d4e6381b19..3906ad30b37 100644
--- a/src/chartab.c
+++ b/src/chartab.c
@@ -140,15 +140,11 @@ the char-table has no extra slot.  */)
 static Lisp_Object
 make_sub_char_table (int depth, int min_char, Lisp_Object defalt)
 {
-  Lisp_Object table;
-  int size = (PSEUDOVECSIZE (struct Lisp_Sub_Char_Table, contents)
-              + chartab_size[depth]);
-
-  table = Fmake_vector (make_number (size), defalt);
-  XSETPVECTYPE (XVECTOR (table), PVEC_SUB_CHAR_TABLE);
-  XSUB_CHAR_TABLE (table)->depth = make_number (depth);
-  XSUB_CHAR_TABLE (table)->min_char = make_number (min_char);
+  int i;
+  Lisp_Object table = make_uninit_sub_char_table (depth, min_char);
 
+  for (i = 0; i < chartab_size[depth]; i++)
+    XSUB_CHAR_TABLE (table)->contents[i] = defalt;
   return table;
 }
 
@@ -172,8 +168,8 @@ char_table_ascii (Lisp_Object table)
 static Lisp_Object
 copy_sub_char_table (Lisp_Object table)
 {
-  int depth = XINT (XSUB_CHAR_TABLE (table)->depth);
-  int min_char = XINT (XSUB_CHAR_TABLE (table)->min_char);
+  int depth = XSUB_CHAR_TABLE (table)->depth;
+  int min_char = XSUB_CHAR_TABLE (table)->min_char;
   Lisp_Object copy = make_sub_char_table (depth, min_char, Qnil);
   int i;
 
@@ -220,10 +216,8 @@ static Lisp_Object
 sub_char_table_ref (Lisp_Object table, int c, bool is_uniprop)
 {
   struct Lisp_Sub_Char_Table *tbl = XSUB_CHAR_TABLE (table);
-  int depth = XINT (tbl->depth);
-  int min_char = XINT (tbl->min_char);
   Lisp_Object val;
-  int idx = CHARTAB_IDX (c, depth, min_char);
+  int idx = CHARTAB_IDX (c, tbl->depth, tbl->min_char);
 
   val = tbl->contents[idx];
   if (is_uniprop && UNIPROP_COMPRESSED_FORM_P (val))
@@ -265,8 +259,7 @@ sub_char_table_ref_and_range (Lisp_Object table, int c, int *from, int *to,
                               Lisp_Object defalt, bool is_uniprop)
 {
   struct Lisp_Sub_Char_Table *tbl = XSUB_CHAR_TABLE (table);
-  int depth = XINT (tbl->depth);
-  int min_char = XINT (tbl->min_char);
+  int depth = tbl->depth, min_char = tbl->min_char;
   int chartab_idx = CHARTAB_IDX (c, depth, min_char), idx;
   Lisp_Object val;
 
@@ -402,8 +395,7 @@ static void
 sub_char_table_set (Lisp_Object table, int c, Lisp_Object val, bool is_uniprop)
 {
   struct Lisp_Sub_Char_Table *tbl = XSUB_CHAR_TABLE (table);
-  int depth = XINT ((tbl)->depth);
-  int min_char = XINT ((tbl)->min_char);
+  int depth = tbl->depth, min_char = tbl->min_char;
   int i = CHARTAB_IDX (c, depth, min_char);
   Lisp_Object sub;
 
@@ -458,8 +450,7 @@ sub_char_table_set_range (Lisp_Object table, int from, int to, Lisp_Object val,
                           bool is_uniprop)
 {
   struct Lisp_Sub_Char_Table *tbl = XSUB_CHAR_TABLE (table);
-  int depth = XINT ((tbl)->depth);
-  int min_char = XINT ((tbl)->min_char);
+  int depth = tbl->depth, min_char = tbl->min_char;
   int chars_in_block = chartab_chars[depth];
   int i, c, lim = chartab_size[depth];
 
@@ -689,9 +680,8 @@ static Lisp_Object
 optimize_sub_char_table (Lisp_Object table, Lisp_Object test)
 {
   struct Lisp_Sub_Char_Table *tbl = XSUB_CHAR_TABLE (table);
-  int depth = XINT (tbl->depth);
+  int i, depth = tbl->depth;
   Lisp_Object elt, this;
-  int i;
   bool optimizable;
 
   elt = XSUB_CHAR_TABLE (table)->contents[0];
@@ -778,8 +768,8 @@ map_sub_char_table (void (*c_function) (Lisp_Object, Lisp_Object, Lisp_Object),
     {
       struct Lisp_Sub_Char_Table *tbl = XSUB_CHAR_TABLE (table);
 
-      depth = XINT (tbl->depth);
-      min_char = XINT (tbl->min_char);
+      depth = tbl->depth;
+      min_char = tbl->min_char;
       max_char = min_char + chartab_chars[depth - 1] - 1;
     }
   else
@@ -973,12 +963,10 @@ map_sub_char_table_for_charset (void (*c_function) (Lisp_Object, Lisp_Object),
                                 unsigned from, unsigned to)
 {
   struct Lisp_Sub_Char_Table *tbl = XSUB_CHAR_TABLE (table);
-  int depth = XINT (tbl->depth);
-  int c, i;
+  int i, c = tbl->min_char, depth = tbl->depth;
 
   if (depth < 3)
-    for (i = 0, c = XINT (tbl->min_char); i < chartab_size[depth];
-         i++, c += chartab_chars[depth])
+    for (i = 0; i < chartab_size[depth]; i++, c += chartab_chars[depth])
       {
         Lisp_Object this;
 
@@ -1000,7 +988,7 @@ map_sub_char_table_for_charset (void (*c_function) (Lisp_Object, Lisp_Object),
           }
       }
   else
-    for (i = 0, c = XINT (tbl->min_char); i < chartab_size[depth]; i++, c ++)
+    for (i = 0; i < chartab_size[depth]; i++, c++)
       {
         Lisp_Object this;
         unsigned code;
@@ -1147,8 +1135,7 @@ static Lisp_Object
 uniprop_table_uncompress (Lisp_Object table, int idx)
 {
   Lisp_Object val = XSUB_CHAR_TABLE (table)->contents[idx];
-  int min_char = (XINT (XSUB_CHAR_TABLE (table)->min_char)
-                  + chartab_chars[2] * idx);
+  int min_char = XSUB_CHAR_TABLE (table)->min_char + chartab_chars[2] * idx;
   Lisp_Object sub = make_sub_char_table (3, min_char, Qnil);
   const unsigned char *p, *pend;