st.c: constify st_table* in private functions

Minor size reduction on 32-bit x86:

   text	   data	    bss	    dec	    hex	filename
  13742	     24	      0	  13766	   35c6	st.o
  14166	     24	      0	  14190	   376e	st-orig.o

Public API change to be proposed separately.

* st.c (find_entry): constify st_table*
  (find_packed_index_from): ditto
  (find_packed_index): ditto
  (get_keys): ditto
  (get_values): ditto

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51438 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 9 insertions, 5 deletions

diff --git a/st.c b/st.c
index 0125132bb1..9b79704e2c 100644
--- a/st.c
+++ b/st.c
@@ -347,7 +347,8 @@ count_collision(const struct st_hash_type *type)
     ((ptr) = find_entry((table), key, (hash_val), ((bin_pos) = hash_pos(hash_val, (table)->num_bins))))
 
 static st_table_entry *
-find_entry(st_table *table, st_data_t key, st_index_t hash_val, st_index_t bin_pos)
+find_entry(const st_table *table, st_data_t key, st_index_t hash_val,
+           st_index_t bin_pos)
 {
     register st_table_entry *ptr = table->bins[bin_pos];
     FOUND_ENTRY;
@@ -362,7 +363,8 @@ find_entry(st_table *table, st_data_t key, st_index_t hash_val, st_index_t bin_p
 }
 
 static inline st_index_t
-find_packed_index_from(st_table *table, st_index_t hash_val, st_data_t key, st_index_t i)
+find_packed_index_from(const st_table *table, st_index_t hash_val,
+		       st_data_t key, st_index_t i)
 {
     while (i < table->real_entries &&
 	   (PHASH(table, i) != hash_val || !EQUAL(table, key, &PACKED_ENT(table, i)))) {
@@ -372,7 +374,7 @@ find_packed_index_from(st_table *table, st_index_t hash_val, st_data_t key, st_i
 }
 
 static inline st_index_t
-find_packed_index(st_table *table, st_index_t hash_val, st_data_t key)
+find_packed_index(const st_table *table, st_index_t hash_val, st_data_t key)
 {
     return find_packed_index_from(table, hash_val, key, 0);
 }
@@ -1038,7 +1040,8 @@ st_foreach(st_table *table, int (*func)(ANYARGS), st_data_t arg)
 }
 
 static st_index_t
-get_keys(st_table *table, st_data_t *keys, st_index_t size, int check, st_data_t never)
+get_keys(const st_table *table, st_data_t *keys, st_index_t size,
+         int check, st_data_t never)
 {
     st_data_t key;
     st_data_t *keys_start = keys;
@@ -1081,7 +1084,8 @@ st_keys_check(st_table *table, st_data_t *keys, st_index_t size, st_data_t never
 }
 
 static st_index_t
-get_values(st_table *table, st_data_t *values, st_index_t size, int check, st_data_t never)
+get_values(const st_table *table, st_data_t *values, st_index_t size,
+           int check, st_data_t never)
 {
     st_data_t key;
     st_data_t *values_start = values;