More block constification

I noticed that there are still many places referring to non-const
blocks.  This constifies all the remaining ones that I found that
could be constified.

In a few spots, this search found unused variables or fields.  I
removed these.  I've also removed some unnecessary casts to
"struct block *".

gdb/ChangeLog
2019-03-24  Tom Tromey  <tom@tromey.com>

	* c-exp.y (typebase): Remove casts.
	* gdbtypes.c (lookup_unsigned_typename, )
	(lookup_signed_typename): Remove cast.
	* eval.c (parse_to_comma_and_eval): Remove cast.
	* parse.c (write_dollar_variable): Remove cast.
	* block.h (struct block) <superblock>: Now const.
	* symfile-debug.c (debug_qf_map_matching_symbols): Update.
	* psymtab.c (psym_map_matching_symbols): Make "block" const.
	(map_block): Make "block" const.
	* symfile.h (struct quick_symbol_functions)
	<map_matching_symbols>: Constify block argument to "callback".
	* symtab.c (basic_lookup_transparent_type_quick): Make "block"
	const.
	(find_pc_sect_compunit_symtab): Make "b" const.
	(find_symbol_at_address): Likewise.
	(search_symbols): Likewise.
	* dwarf2read.c (dw2_lookup_symbol): Make "block" const.
	(dw2_debug_names_lookup_symbol): Likewise.
	(dw2_map_matching_symbols): Update.
	* p-valprint.c (pascal_val_print): Remove "block".
	* ada-lang.c (ada_add_global_exceptions): Make "b" const.
	(aux_add_nonlocal_symbols): Make "block" const.
	(resolve_subexp): Remove cast.
	* linespec.c (iterate_over_all_matching_symtabs): Make "block"
	const.
	(iterate_over_file_blocks): Likewise.
	* f-exp.y (%union) <bval>: Remove.
	* coffread.c (patch_opaque_types): Make "b" const.
	* spu-tdep.c (spu_catch_start): Make "block" const.
	* c-valprint.c (print_unpacked_pointer): Remove "block".
	* symmisc.c (dump_symtab_1): Make "b" const.
	(block_depth): Make "block" const.
	* d-exp.y (%union) <bval>: Remove.
	* cp-support.h (cp_lookup_rtti_type): Update.
	* cp-support.c (cp_lookup_rtti_type): Make "block" const.
	* psymtab.c (psym_lookup_symbol): Make "block" const.
	(maintenance_check_psymtabs): Make "b" const.
	* python/py-framefilter.c (extract_sym): Make "sym_block" const.
	(enumerate_locals, enumerate_args): Update.
	* python/py-symtab.c (stpy_global_block): Make "block" const.
	(stpy_static_block): Likewise.
	* inline-frame.c (block_starting_point_at): Make "new_block"
	const.
	* block.c (find_block_in_blockvector): Make return type const.
	(blockvector_for_pc_sect): Make "b" const.
	(find_block_in_blockvector): Make "b" const.

1 files changed, 6 insertions, 6 deletions

diff --git a/gdb/psymtab.c b/gdb/psymtab.c
index 96b4fa0..584a5e9 100644
--- a/gdb/psymtab.c
+++ b/gdb/psymtab.c
@@ -498,7 +498,7 @@ psym_lookup_symbol (struct objfile *objfile,
 	     partial symtab is empty, we can assume it won't here
 	     because lookup_partial_symbol succeeded.  */
 	  const struct blockvector *bv = COMPUNIT_BLOCKVECTOR (stab);
-	  struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
+	  const struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
 
 	  sym = block_find_symbol (block, name, domain,
 				   block_find_non_opaque_type_preferred,
@@ -1165,8 +1165,8 @@ psymtab_to_fullname (struct partial_symtab *ps)
 
 static int
 map_block (const char *name, domain_enum domain, struct objfile *objfile,
-	   struct block *block,
-	   int (*callback) (struct block *, struct symbol *, void *),
+	   const struct block *block,
+	   int (*callback) (const struct block *, struct symbol *, void *),
 	   void *data, symbol_name_match_type match)
 {
   struct block_iterator iter;
@@ -1196,7 +1196,7 @@ static void
 psym_map_matching_symbols (struct objfile *objfile,
 			   const char *name, domain_enum domain,
 			   int global,
-			   int (*callback) (struct block *,
+			   int (*callback) (const struct block *,
 					    struct symbol *, void *),
 			   void *data,
 			   symbol_name_match_type match,
@@ -1212,7 +1212,7 @@ psym_map_matching_symbols (struct objfile *objfile,
 				   ordered_compare))
 	{
 	  struct compunit_symtab *cust = psymtab_to_symtab (objfile, ps);
-	  struct block *block;
+	  const struct block *block;
 
 	  if (cust == NULL)
 	    continue;
@@ -2095,7 +2095,7 @@ maintenance_check_psymtabs (const char *ignore, int from_tty)
   struct symbol *sym;
   struct compunit_symtab *cust = NULL;
   const struct blockvector *bv;
-  struct block *b;
+  const struct block *b;
   int length;
 
   for (objfile *objfile : current_program_space->objfiles ())