gdb

* breakpoint.c (save_cmdlist): No longer static.
	* gdbcmd.h (save_cmdlist): Declare.
	* symfile.c (symbol_file_add_with_addrs_or_offsets): Set
	OBJF_READNOW on objfile if readnow_symbol_files.
	* elfread.c (elf_symfile_read): Use dwarf2_initialize_objfile.
	(elf_sym_fns_gdb_index): New global.
	* dwarf2read.c: Include exceptions.h.
	(offset_type): New.
	(struct mapped_index): New.
	(dwarf2_per_cu_data_ptr): New typedef.
	(struct dwarf2_per_objfile) <using_index, index_table, gdb_index>:
	New fields.
	(GDB_INDEX_SECTION): New define.
	(struct dwarf2_per_cu_quick_data): New.
	(struct dwarf2_per_cu_data) <objfile>: New field.
	<psymtab>: Removed.
	<v>: New field.
	(byte_swap): New function.
	(MAYBE_SWAP): New macro.
	(INDEX_SUFFIX): New macro.
	(dw2_do_instantiate_symtab): New function.
	(dw2_instantiate_symtab): Likewise.
	(create_cus_from_index): Likewise.
	(create_addrmap_from_index): Likewise.
	(mapped_index_string_hash): Likewise.
	(find_slot_in_mapped_hash): Likewise.
	(dwarf2_read_index): Likewise.
	(dw2_setup): Likewise.
	(dw2_require_line_header): Likewise.
	(dw2_require_full_path): Likewise.
	(dw2_find_last_source_symtab): Likewise.
	(dw2_forget_cached_source_info): Likewise.
	(dw2_lookup_symtab): Likewise.
	(dw2_lookup_symbol): Likewise.
	(dw2_do_expand_symtabs_matching): Likewise.
	(dw2_pre_expand_symtabs_matching): Likewise.
	(dw2_print_stats): Likewise.
	(dw2_dump): Likewise.
	(dw2_relocate): Likewise.
	(dw2_expand_symtabs_for_function): Likewise.
	(dw2_expand_all_symtabs): Likewise.
	(dw2_expand_symtabs_with_filename): Likewise.
	(dw2_find_symbol_file): Likewise.
	(dw2_map_ada_symtabs): Likewise.
	(dw2_expand_symtabs_matching): Likewise.
	(dw2_find_pc_sect_symtab): Likewise.
	(dw2_map_symbol_names): Likewise.
	(dw2_map_symbol_filenames): Likewise.
	(dw2_has_symbols): Likewise.
	(dwarf2_gdb_index_functions): New global.
	(dwarf2_initialize_objfile): New function.
	(process_psymtab_comp_unit): Update.
	(add_partial_subprogram): Likewise.
	(dwarf2_psymtab_to_symtab): Likewise.
	(psymtab_to_symtab_1): Use dw2_do_instantiate_symtab.
	(process_full_comp_unit): Update.
	(find_file_and_directory): New function.
	(read_file_scope): Use find_file_and_directory.
	(dwarf2_per_cu_objfile): Update.
	(dwarf2_per_cu_addr_size): Update.
	(dwarf2_per_cu_offset_size): Update.
	(dwarf2_free_objfile): Free the index, if needed.
	(dwarf2_per_objfile_free): Unmap the index, if needed.
	(struct strtab_entry): New.
	(hash_strtab_entry): New function.
	(eq_strtab_entry): Likewise.
	(create_strtab): Likewise.
	(add_string): Likewise.
	(struct symtab_index_entry): New.
	(struct mapped_symtab): New.
	(hash_symtab_entry): New function.
	(eq_symtab_entry): Likewise.
	(delete_symtab_entry): Likewise.
	(create_index_table): Likewise.
	(create_mapped_symtab): Likewise.
	(cleanup_mapped_symtab): Likewise.
	(find_slot): Likewise.
	(hash_expand): Likewise.
	(add_index_entry): Likewise.
	(add_indices_to_cpool): Likewise.
	(write_hash_table): Likewise.
	(add_address_entry): Likewise.
	(write_psymbols): Likewise.
	(write_obstack): Likewise.
	(unlink_if_set): Likewise.
	(write_psymtabs_to_index): Likewise.
	(save_gdb_index_command): Likewise.
	(_initialize_dwarf2_read): Install "save gdb-index"
	command.
	(create_all_comp_units): Initialize 'objfile' field of CU.
	(dwarf2_locate_sections): Check for .gdb_index.
	* psymtab.h (dwarf2_gdb_index_functions): Declare.
	* symfile.h (dwarf2_initialize_objfile): Declare.
gdb/doc
	* gdb.texinfo (Index Files): New node.

gdb/ChangeLog

@@ -1,3 +1,99 @@
+2010-07-13  Tom Tromey  <tromey@redhat.com>
+
+	* breakpoint.c (save_cmdlist): No longer static.
+	* gdbcmd.h (save_cmdlist): Declare.
+	* symfile.c (symbol_file_add_with_addrs_or_offsets): Set
+	OBJF_READNOW on objfile if readnow_symbol_files.
+	* elfread.c (elf_symfile_read): Use dwarf2_initialize_objfile.
+	(elf_sym_fns_gdb_index): New global.
+	* dwarf2read.c: Include exceptions.h.
+	(offset_type): New.
+	(struct mapped_index): New.
+	(dwarf2_per_cu_data_ptr): New typedef.
+	(struct dwarf2_per_objfile) <using_index, index_table, gdb_index>:
+	New fields.
+	(GDB_INDEX_SECTION): New define.
+	(struct dwarf2_per_cu_quick_data): New.
+	(struct dwarf2_per_cu_data) <objfile>: New field.
+	<psymtab>: Removed.
+	<v>: New field.
+	(byte_swap): New function.
+	(MAYBE_SWAP): New macro.
+	(INDEX_SUFFIX): New macro.
+	(dw2_do_instantiate_symtab): New function.
+	(dw2_instantiate_symtab): Likewise.
+	(create_cus_from_index): Likewise.
+	(create_addrmap_from_index): Likewise.
+	(mapped_index_string_hash): Likewise.
+	(find_slot_in_mapped_hash): Likewise.
+	(dwarf2_read_index): Likewise.
+	(dw2_setup): Likewise.
+	(dw2_require_line_header): Likewise.
+	(dw2_require_full_path): Likewise.
+	(dw2_find_last_source_symtab): Likewise.
+	(dw2_forget_cached_source_info): Likewise.
+	(dw2_lookup_symtab): Likewise.
+	(dw2_lookup_symbol): Likewise.
+	(dw2_do_expand_symtabs_matching): Likewise.
+	(dw2_pre_expand_symtabs_matching): Likewise.
+	(dw2_print_stats): Likewise.
+	(dw2_dump): Likewise.
+	(dw2_relocate): Likewise.
+	(dw2_expand_symtabs_for_function): Likewise.
+	(dw2_expand_all_symtabs): Likewise.
+	(dw2_expand_symtabs_with_filename): Likewise.
+	(dw2_find_symbol_file): Likewise.
+	(dw2_map_ada_symtabs): Likewise.
+	(dw2_expand_symtabs_matching): Likewise.
+	(dw2_find_pc_sect_symtab): Likewise.
+	(dw2_map_symbol_names): Likewise.
+	(dw2_map_symbol_filenames): Likewise.
+	(dw2_has_symbols): Likewise.
+	(dwarf2_gdb_index_functions): New global.
+	(dwarf2_initialize_objfile): New function.
+	(process_psymtab_comp_unit): Update.
+	(add_partial_subprogram): Likewise.
+	(dwarf2_psymtab_to_symtab): Likewise.
+	(psymtab_to_symtab_1): Use dw2_do_instantiate_symtab.
+	(process_full_comp_unit): Update.
+	(find_file_and_directory): New function.
+	(read_file_scope): Use find_file_and_directory.
+	(dwarf2_per_cu_objfile): Update.
+	(dwarf2_per_cu_addr_size): Update.
+	(dwarf2_per_cu_offset_size): Update.
+	(dwarf2_free_objfile): Free the index, if needed.
+	(dwarf2_per_objfile_free): Unmap the index, if needed.
+	(struct strtab_entry): New.
+	(hash_strtab_entry): New function.
+	(eq_strtab_entry): Likewise.
+	(create_strtab): Likewise.
+	(add_string): Likewise.
+	(struct symtab_index_entry): New.
+	(struct mapped_symtab): New.
+	(hash_symtab_entry): New function.
+	(eq_symtab_entry): Likewise.
+	(delete_symtab_entry): Likewise.
+	(create_index_table): Likewise.
+	(create_mapped_symtab): Likewise.
+	(cleanup_mapped_symtab): Likewise.
+	(find_slot): Likewise.
+	(hash_expand): Likewise.
+	(add_index_entry): Likewise.
+	(add_indices_to_cpool): Likewise.
+	(write_hash_table): Likewise.
+	(add_address_entry): Likewise.
+	(write_psymbols): Likewise.
+	(write_obstack): Likewise.
+	(unlink_if_set): Likewise.
+	(write_psymtabs_to_index): Likewise.
+	(save_gdb_index_command): Likewise.
+	(_initialize_dwarf2_read): Install "save gdb-index"
+	command.
+	(create_all_comp_units): Initialize 'objfile' field of CU.
+	(dwarf2_locate_sections): Check for .gdb_index.
+	* psymtab.h (dwarf2_gdb_index_functions): Declare.
+	* symfile.h (dwarf2_initialize_objfile): Declare.
+
 2010-07-13  Tom Tromey  <tromey@redhat.com>
 
 	* symtab.c (lookup_symbol_aux_symtabs): Call pre-expand hook.

gdb/breakpoint.c

@@ -430,7 +430,7 @@ static int tracepoint_count;
 
 static struct cmd_list_element *breakpoint_set_cmdlist;
 static struct cmd_list_element *breakpoint_show_cmdlist;
-static struct cmd_list_element *save_cmdlist;
+struct cmd_list_element *save_cmdlist;
 
 /* Return whether a breakpoint is an active enabled breakpoint.  */
 static int

gdb/doc/ChangeLog

@@ -1,3 +1,7 @@
+2010-07-13  Tom Tromey  <tromey@redhat.com>
+
+	* gdb.texinfo (Index Files): New node.
+
 2010-07-13  Tom Tromey  <tromey@redhat.com>
 
 	* gdb.texinfo (GDB/MI Variable Objects): Remove extra 'for'.

gdb/doc/gdb.texinfo

@@ -14289,6 +14289,7 @@ program.  To debug a core dump of a previous run, you must also tell
 @menu
 * Files::                       Commands to specify files
 * Separate Debug Files::        Debugging information in separate files
+* Index Files::                 Index files speed up GDB
 * Symbol Errors::               Errors reading symbol files
 * Data Files::                  GDB data files
 @end menu
@@ -15178,6 +15179,46 @@ gnu_debuglink_crc32 (unsigned long crc,
 This computation does not apply to the ``build ID'' method.
 
 
+@node Index Files
+@section Index Files Speed Up @value{GDBN}
+@cindex index files
+@cindex @samp{.gdb_index} section
+
+When @value{GDBN} finds a symbol file, it scans the symbols in the
+file in order to construct an internal symbol table.  This lets most
+@value{GDBN} operations work quickly---at the cost of a delay early
+on.  For large programs, this delay can be quite lengthy, so
+@value{GDBN} provides a way to build an index, which speeds up
+startup.
+
+The index is stored as a section in the symbol file.  @value{GDBN} can
+write the index to a file, then you can put it into the symbol file
+using @command{objcopy}.
+
+To create an index file, use the @code{save gdb-index} command:
+
+@table @code
+@item save gdb-index @var{directory}
+@kindex save gdb-index
+Create an index file for each symbol file currently known by
+@value{GDBN}.  Each file is named after its corresponding symbol file,
+with @samp{.gdb-index} appended, and is written into the given
+@var{directory}.
+@end table
+
+Once you have created an index file you can merge it into your symbol
+file, here named @file{symfile}, using @command{objcopy}:
+
+@smallexample
+$ objcopy --add-section .gdb_index=symfile.gdb-index \
+    --set-section-flags .gdb_index=readonly symfile symfile
+@end smallexample
+
+There are currently some limitation on indices.  They only work when
+for DWARF debugging information, not stabs.  And, they do not
+currently work for programs using Ada.
+
+
 @node Symbol Errors
 @section Errors Reading Symbol Files
 

gdb/elfread.c

@@ -40,6 +40,9 @@
 
 extern void _initialize_elfread (void);
 
+/* Forward declaration.  */
+static struct sym_fns elf_sym_fns_gdb_index;
+
 /* The struct elfinfo is available only during ELF symbol table and
    psymtab reading.  It is destroyed at the completion of psymtab-reading.
    It's local to elf_symfile_read.  */
@@ -869,11 +872,9 @@ elf_symfile_read (struct objfile *objfile, int symfile_flags)
 				str_sect->filepos,
 				bfd_section_size (abfd, str_sect));
     }
-  if (dwarf2_has_info (objfile))
-    {
-      /* DWARF 2 sections */
-      dwarf2_build_psymtabs (objfile);
-    }
+
+  if (dwarf2_has_info (objfile) && dwarf2_initialize_objfile (objfile))
+    objfile->sf = &elf_sym_fns_gdb_index;
 
   /* If the file has its own symbol tables it has no separate debug info.
      `.dynsym'/`.symtab' go to MSYMBOLS, `.debug_info' goes to SYMTABS/PSYMTABS.
@@ -1049,6 +1050,24 @@ static struct sym_fns elf_sym_fns =
   NULL				/* next: pointer to next struct sym_fns */
 };
 
+/* The same as elf_sym_fns, but not registered and uses the
+   DWARF-specific GNU index rather than psymtab.  */
+static struct sym_fns elf_sym_fns_gdb_index =
+{
+  bfd_target_elf_flavour,
+  elf_new_init,			/* sym_new_init: init anything gbl to entire symab */
+  elf_symfile_init,		/* sym_init: read initial info, setup for sym_red() */
+  elf_symfile_read,		/* sym_read: read a symbol file into symtab */
+  elf_symfile_finish,		/* sym_finish: finished with file, cleanup */
+  default_symfile_offsets,	/* sym_offsets:  Translate ext. to int. relocatin */
+  elf_symfile_segments,		/* sym_segments: Get segment information from
+				   a file.  */
+  NULL,                         /* sym_read_linetable */
+  default_symfile_relocate,	/* sym_relocate: Relocate a debug section.  */
+  &dwarf2_gdb_index_functions,
+  NULL				/* next: pointer to next struct sym_fns */
+};
+
 void
 _initialize_elfread (void)
 {

gdb/gdbcmd.h

@@ -124,6 +124,10 @@ extern struct cmd_list_element *setchecklist;
 
 extern struct cmd_list_element *showchecklist;
 
+/* Chain containing all defined "save" subcommands.  */
+
+extern struct cmd_list_element *save_cmdlist;
+
 extern void execute_command (char *, int);
 
 enum command_control_type execute_control_command (struct command_line *);

gdb/psymtab.h

@@ -1,6 +1,6 @@
 /* Public partial symbol table definitions.
 
-   Copyright (C) 2009 Free Software Foundation, Inc.
+   Copyright (C) 2009, 2010 Free Software Foundation, Inc.
 
    This file is part of GDB.
 
@@ -28,4 +28,6 @@ void map_partial_symbol_filenames (void (*) (const char *, const char *,
 
 extern const struct quick_symbol_functions psym_functions;
 
+extern const struct quick_symbol_functions dwarf2_gdb_index_functions;
+
 #endif /* PSYMTAB_H */

gdb/symfile.c

@@ -1059,6 +1059,9 @@ symbol_file_add_with_addrs_or_offsets (bfd *abfd,
   const char *name = bfd_get_filename (abfd);
   const int from_tty = add_flags & SYMFILE_VERBOSE;
 
+  if (readnow_symbol_files)
+    flags |= OBJF_READNOW;
+
   my_cleanups = make_cleanup_bfd_close (abfd);
 
   /* Give user a chance to burp if we'd be
@@ -1095,7 +1098,7 @@ symbol_file_add_with_addrs_or_offsets (bfd *abfd,
      the gdb startup command line or on a per symbol file basis.  Expand
      all partial symbol tables for this objfile if so. */
 
-  if ((flags & OBJF_READNOW) || readnow_symbol_files)
+  if ((flags & OBJF_READNOW))
     {
       if (from_tty || info_verbose)
 	{

gdb/symfile.h

@@ -575,6 +575,7 @@ extern struct cleanup *increment_reading_symtab (void);
 
 extern int dwarf2_has_info (struct objfile *);
 
+extern int dwarf2_initialize_objfile (struct objfile *);
 extern void dwarf2_build_psymtabs (struct objfile *);
 extern void dwarf2_build_frame_info (struct objfile *);