remove msymbol_objfile

This is another patch in my ongoing series to "split" objfile to share
more read-only data across inferiors.  See

    http://sourceware.org/gdb/wiki/ObjfileSplitting

When symbols are finally shared, there will be no back-link from the
symbol to its containing objfile, because there may be more than one
such objfile.  So, all such back-links must be removed.

One hidden back-link is the msymbol_objfile function.  Since
(eventually) a symbol may appear in more than one objfile, trying to
look up the objfile given just a symbol cannot work.

This patch removes msymbol_objfile in favor of using a bound minimal
symbol.  It introduces a new function to make this conversion simpler
in some spots.

The bonus of this patch is that using msymbol_objfile is slower than
simply looking up the owning objfile in the first place.

Built and regtested on x86-64 Fedora 18.

	* ada-exp.y (write_var_or_type): Use bound_minimal_symbol.
	* ada-lang.c (ada_lookup_simple_minsym): Return
	bound_minimal_symbol.
	* ada-lang.h (ada_lookup_simple_minsym): Update.
	* c-exp.y (variable): Use lookup_bound_minimal_symbol.
	* f-exp.y (variable): Use lookup_bound_minimal_symbol.
	* go-exp.y (variable): Use lookup_bound_minimal_symbol.
	* jv-exp.y (push_expression_name): Use lookup_bound_minimal_symbol.
	* m2-exp.y (variable): Use lookup_bound_minimal_symbol.
	* minsyms.c (msymbol_objfile): Remove.
	(lookup_minimal_symbol_internal): New function, from
	lookup_minimal_symbol.
	(lookup_minimal_symbol): Rewrite using
	lookup_minimal_symbol_internal.
	(lookup_bound_minimal_symbol): New function.
	* minsyms.h (msymbol_objfile): Remove.
	(lookup_bound_minimal_symbol): Declare.
	* p-exp.y (variable): Use lookup_bound_minimal_symbol.
	* parse.c (write_exp_msymbol): Change parameter to a
	bound_minimal_symbol.
	(write_dollar_variable): Use lookup_bound_minimal_symbol.
	* parser-defs.h (write_exp_msymbol): Update.
	* printcmd.c (address_info): Use lookup_bound_minimal_symbol.
	* symfile.c (simple_read_overlay_table): Use
	lookup_bound_minimal_symbol.
	* symtab.c (skip_prologue_sal): Don't use msymbol_objfile.
	(search_symbols): Likewise.
	(print_msymbol_info): Take a bound_minimal_symbol argument.
	(symtab_symbol_info, rbreak_command): Update.
	* symtab.h (struct symbol_search) <msymbol>: Change type
	to bound_minimal_symbol.
	* valops.c (find_function_in_inferior): Use
	lookup_bound_minimal_symbol.
	* value.c (value_fn_field): Use lookup_bound_minimal_symbol.

1 files changed, 6 insertions, 6 deletions

diff --git a/gdb/printcmd.c b/gdb/printcmd.c
index 1cc248d7..68921b0 100644
--- a/gdb/printcmd.c
+++ b/gdb/printcmd.c
@@ -1201,7 +1201,7 @@ address_info (char *exp, int from_tty)
   struct gdbarch *gdbarch;
   int regno;
   struct symbol *sym;
-  struct minimal_symbol *msymbol;
+  struct bound_minimal_symbol msymbol;
   long val;
   struct obj_section *section;
   CORE_ADDR load_addr, context_pc = 0;
@@ -1227,14 +1227,14 @@ address_info (char *exp, int from_tty)
 	  return;
 	}
 
-      msymbol = lookup_minimal_symbol (exp, NULL, NULL);
+      msymbol = lookup_bound_minimal_symbol (exp);
 
-      if (msymbol != NULL)
+      if (msymbol.minsym != NULL)
 	{
-	  struct objfile *objfile = msymbol_objfile (msymbol);
+	  struct objfile *objfile = msymbol.objfile;
 
 	  gdbarch = get_objfile_arch (objfile);
-	  load_addr = SYMBOL_VALUE_ADDRESS (msymbol);
+	  load_addr = SYMBOL_VALUE_ADDRESS (msymbol.minsym);
 
 	  printf_filtered ("Symbol \"");
 	  fprintf_symbol_filtered (gdb_stdout, exp,
@@ -1242,7 +1242,7 @@ address_info (char *exp, int from_tty)
 	  printf_filtered ("\" is at ");
 	  fputs_filtered (paddress (gdbarch, load_addr), gdb_stdout);
 	  printf_filtered (" in a file compiled without debugging");
-	  section = SYMBOL_OBJ_SECTION (objfile, msymbol);
+	  section = SYMBOL_OBJ_SECTION (objfile, msymbol.minsym);
 	  if (section_is_overlay (section))
 	    {
 	      load_addr = overlay_unmapped_address (load_addr, section);