constify some blockvector APIs

Generally, the blockvector ought to be readonly.  So, this patch makes
the blockvector const in the symtab, and also changes various
blockvector APIs to be const.

This patch has a couple of spots that cast away const.  I consider
these to be ok because they occur in mdebugread and are used while
constructing the blockvector.  I have added comments at these spots.

2014-06-18  Tom Tromey  <tromey@redhat.com>

	* symtab.h (struct symtab) <blockvector>: Now const.
	* ada-lang.c (ada_add_global_exceptions): Update.
	* buildsym.c (augment_type_symtab): Update.
	* dwarf2read.c (dw2_lookup_symbol): Update.
	* jit.c (finalize_symtab): Update.
	* jv-lang.c (add_class_symtab_symbol): Update.
	* mdebugread.c (parse_symbol, add_block, sort_blocks, new_symtab):
	Update.
	* objfiles.c (objfile_relocate1): Update.
	* psymtab.c (lookup_symbol_aux_psymtabs)
	(maintenance_check_psymtabs): Update.
	* python/py-symtab.c (stpy_global_block, stpy_static_block):
	Update.
	* spu-tdep.c (spu_catch_start): Update.
	* symmisc.c (dump_symtab_1): Update.
	* symtab.c (lookup_global_symbol_from_objfile)
	(lookup_symbol_aux_objfile, lookup_symbol_aux_quick)
	(basic_lookup_transparent_type_quick)
	(basic_lookup_transparent_type, find_pc_sect_symtab)
	(find_pc_sect_line, search_symbols): Update.
	* block.c (find_block_in_blockvector): Make "bl" const.
	(blockvector_for_pc_sect, blockvector_for_pc): Make return type
	const.
	(blockvector_contains_pc): Make "bv" const.
	(block_for_pc_sect): Update.
	* block.h (blockvector_for_pc, blockvector_for_pc_sect)
	(blockvector_contains_pc): Update.
	* breakpoint.c (resolve_sal_pc): Update.
	* inline-frame.c (block_starting_point_at): Update.

1 files changed, 2 insertions, 2 deletions

diff --git a/gdb/psymtab.c b/gdb/psymtab.c
index 2787f4c..ba6a58a 100644
--- a/gdb/psymtab.c
+++ b/gdb/psymtab.c
@@ -517,7 +517,7 @@ lookup_symbol_aux_psymtabs (struct objfile *objfile,
 	   information (but NAME might contain it).  */
 	if (stab->primary)
 	  {
-	    struct blockvector *bv = BLOCKVECTOR (stab);
+	    const struct blockvector *bv = BLOCKVECTOR (stab);
 	    struct block *block = BLOCKVECTOR_BLOCK (bv, block_index);
 
 	    sym = lookup_block_symbol (block, name, domain);
@@ -2003,7 +2003,7 @@ maintenance_check_psymtabs (char *ignore, int from_tty)
   struct partial_symbol **psym;
   struct symtab *s = NULL;
   struct partial_symtab *ps;
-  struct blockvector *bv;
+  const struct blockvector *bv;
   struct objfile *objfile;
   struct block *b;
   int length;