Replace dw2_get_cu/dw2_get_cutu with methods of dwarf2_per_objfile

Those two functions look like good candidates to become methods of
dwarf2_per_objfile.  I did that, and added get_tu as well.  When
replacing usages of dw2_get_cutu, I changed some instances to get_cutu
and others to get_cu, when appropriate (when we know we want a CU and
not a TU).

gdb/ChangeLog:

	* dwarf2read.h (struct signatured_type): Forward declare.
	(struct dwarf2_per_objfile) <get_cutu, get_cu, get_tu>:
	New methods.
	* dwarf2read.c (dwarf2_per_objfile::get_cutu): Rename from...
	(dw2_get_cutu): ...this.
	(dwarf2_per_objfile::get_cu): Rename from...
	(dw2_get_cu): ...this.
	(dwarf2_per_objfile::get_tu): New.
	(create_addrmap_from_index): Adjust.
	(create_addrmap_from_aranges): Adjust.
	(dw2_find_last_source_symtab): Adjust.
	(dw2_map_symtabs_matching_filename): Adjust.
	(dw2_symtab_iter_next): Adjust.
	(dw2_print_stats): Adjust.
	(dw2_expand_all_symtabs): Adjust.
	(dw2_expand_symtabs_with_fullname): Adjust.
	(dw2_expand_marked_cus): Adjust.
	(dw_expand_symtabs_matching_file_matcher): Adjust.
	(dw2_map_symbol_filenames): Adjust.
	(dw2_debug_names_iterator::next): Adjust.
	(dwarf2_initialize_objfile): Adjust.
	(set_partial_user): Adjust.
	(dwarf2_build_psymtabs_hard): Adjust.

1 files changed, 25 insertions, 0 deletions

diff --git a/gdb/dwarf2read.h b/gdb/dwarf2read.h
index 46a1052..24b5ff4 100644
--- a/gdb/dwarf2read.h
+++ b/gdb/dwarf2read.h
@@ -89,6 +89,7 @@ struct tu_stats
 struct dwarf2_debug_sections;
 struct mapped_index;
 struct mapped_debug_names;
+struct signatured_type;
 
 /* Collection of data recorded per objfile.
    This hangs off of dwarf2_objfile_data_key.  */
@@ -105,6 +106,30 @@ struct dwarf2_per_objfile : public allocate_on_obstack
 
   DISABLE_COPY_AND_ASSIGN (dwarf2_per_objfile);
 
+  /* Return the CU/TU given its index.
+
+     This is intended for loops like:
+
+     for (i = 0; i < (dwarf2_per_objfile->n_comp_units
+		      + dwarf2_per_objfile->n_type_units); ++i)
+       {
+         dwarf2_per_cu_data *per_cu = dwarf2_per_objfile->get_cutu (i);
+
+         ...;
+       }
+  */
+  dwarf2_per_cu_data *get_cutu (int index);
+
+  /* Return the CU given its index.
+     This differs from get_cutu in that it's for when you know INDEX refers to a
+     CU.  */
+  dwarf2_per_cu_data *get_cu (int index);
+
+  /* Return the TU given its index.
+     This differs from get_cutu in that it's for when you know INDEX refers to a
+     TU.  */
+  signatured_type *get_tu (int index);
+
   /* Free all cached compilation units.  */
   void free_cached_comp_units ();
 private: