Constify some target_so_ops instances

This changes some target_so_ops instances to be const.  This makes
their use a little more obvious (they can't be mutated) and also
allows for the removal of some initialization code.

gdb/frv-tdep.h

@@ -119,6 +119,6 @@ CORE_ADDR frv_fdpic_find_canonical_descriptor (CORE_ADDR entry_point);
 CORE_ADDR frv_fetch_objfile_link_map (struct objfile *objfile);
 
 struct target_so_ops;
-extern struct target_so_ops frv_so_ops;
+extern const struct target_so_ops frv_so_ops;
 
 #endif /* FRV_TDEP_H */

gdb/solib-aix.c

@@ -718,25 +718,23 @@ show_solib_aix_debug (struct ui_file *file, int from_tty,
 }
 
 /* The target_so_ops for AIX targets.  */
-struct target_so_ops solib_aix_so_ops;
+const struct target_so_ops solib_aix_so_ops =
+{
+  solib_aix_relocate_section_addresses,
+  solib_aix_free_so,
+  nullptr,
+  solib_aix_clear_solib,
+  solib_aix_solib_create_inferior_hook,
+  solib_aix_current_sos,
+  solib_aix_open_symbol_file_object,
+  solib_aix_in_dynsym_resolve_code,
+  solib_aix_bfd_open,
+};
 
 void _initialize_solib_aix ();
 void
 _initialize_solib_aix ()
 {
-  solib_aix_so_ops.relocate_section_addresses
-    = solib_aix_relocate_section_addresses;
-  solib_aix_so_ops.free_so = solib_aix_free_so;
-  solib_aix_so_ops.clear_solib = solib_aix_clear_solib;
-  solib_aix_so_ops.solib_create_inferior_hook
-    = solib_aix_solib_create_inferior_hook;
-  solib_aix_so_ops.current_sos = solib_aix_current_sos;
-  solib_aix_so_ops.open_symbol_file_object
-    = solib_aix_open_symbol_file_object;
-  solib_aix_so_ops.in_dynsym_resolve_code
-    = solib_aix_in_dynsym_resolve_code;
-  solib_aix_so_ops.bfd_open = solib_aix_bfd_open;
-
   gdb::observers::normal_stop.attach (solib_aix_normal_stop_observer,
 				      "solib-aix");
 

gdb/solib-aix.h

@@ -19,7 +19,7 @@
 #define SOLIB_AIX_H
 
 struct target_so_ops;
-extern struct target_so_ops solib_aix_so_ops;
+extern const struct target_so_ops solib_aix_so_ops;
 
 extern CORE_ADDR solib_aix_get_toc_value (CORE_ADDR pc);
 

gdb/solib-darwin.c

@@ -33,6 +33,7 @@
 #include "solist.h"
 #include "solib.h"
 #include "solib-svr4.h"
+#include "solib-darwin.h"
 
 #include "bfd-target.h"
 #include "elf-bfd.h"
@@ -674,18 +675,15 @@ darwin_bfd_open (const char *pathname)
   return res;
 }
 
-struct target_so_ops darwin_so_ops;
-
-void _initialize_darwin_solib ();
-void
-_initialize_darwin_solib ()
+const struct target_so_ops darwin_so_ops =
 {
-  darwin_so_ops.relocate_section_addresses = darwin_relocate_section_addresses;
-  darwin_so_ops.free_so = darwin_free_so;
-  darwin_so_ops.clear_solib = darwin_clear_solib;
-  darwin_so_ops.solib_create_inferior_hook = darwin_solib_create_inferior_hook;
-  darwin_so_ops.current_sos = darwin_current_sos;
-  darwin_so_ops.open_symbol_file_object = open_symbol_file_object;
-  darwin_so_ops.in_dynsym_resolve_code = darwin_in_dynsym_resolve_code;
-  darwin_so_ops.bfd_open = darwin_bfd_open;
-}
+  darwin_relocate_section_addresses,
+  darwin_free_so,
+  nullptr,
+  darwin_clear_solib,
+  darwin_solib_create_inferior_hook,
+  darwin_current_sos,
+  open_symbol_file_object,
+  darwin_in_dynsym_resolve_code,
+  darwin_bfd_open,
+};

gdb/solib-darwin.h

@@ -23,6 +23,6 @@
 struct objfile;
 struct target_so_ops;
 
-extern struct target_so_ops darwin_so_ops;
+extern const struct target_so_ops darwin_so_ops;
 
 #endif /* solib-darwin.h */

gdb/solib-dsbt.c

@@ -29,6 +29,7 @@
 #include "gdbcmd.h"
 #include "elf-bfd.h"
 #include "gdb_bfd.h"
+#include "solib-dsbt.h"
 
 #define GOT_MODULE_OFFSET 4
 
@@ -924,21 +925,23 @@ show_dsbt_debug (struct ui_file *file, int from_tty,
   gdb_printf (file, _("solib-dsbt debugging is %s.\n"), value);
 }
 
-struct target_so_ops dsbt_so_ops;
+const struct target_so_ops dsbt_so_ops =
+{
+  dsbt_relocate_section_addresses,
+  dsbt_free_so,
+  nullptr,
+  dsbt_clear_solib,
+  dsbt_solib_create_inferior_hook,
+  dsbt_current_sos,
+  open_symbol_file_object,
+  dsbt_in_dynsym_resolve_code,
+  solib_bfd_open,
+};
 
 void _initialize_dsbt_solib ();
 void
 _initialize_dsbt_solib ()
 {
-  dsbt_so_ops.relocate_section_addresses = dsbt_relocate_section_addresses;
-  dsbt_so_ops.free_so = dsbt_free_so;
-  dsbt_so_ops.clear_solib = dsbt_clear_solib;
-  dsbt_so_ops.solib_create_inferior_hook = dsbt_solib_create_inferior_hook;
-  dsbt_so_ops.current_sos = dsbt_current_sos;
-  dsbt_so_ops.open_symbol_file_object = open_symbol_file_object;
-  dsbt_so_ops.in_dynsym_resolve_code = dsbt_in_dynsym_resolve_code;
-  dsbt_so_ops.bfd_open = solib_bfd_open;
-
   /* Debug this file's internals.  */
   add_setshow_zuinteger_cmd ("solib-dsbt", class_maintenance,
 			     &solib_dsbt_debug, _("\

gdb/solib-dsbt.h

@@ -0,0 +1,28 @@
+/* Handle shared libraries for GDB, the GNU Debugger.
+
+   Copyright (C) 2022 Free Software Foundation, Inc.
+
+   This file is part of GDB.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef SOLIB_DSBT_H
+#define SOLIB_DSBT_H
+
+struct objfile;
+struct target_so_ops;
+
+extern const struct target_so_ops dsbt_so_ops;
+
+#endif /* solib-dsbt.h */

gdb/solib-frv.c

@@ -1129,21 +1129,23 @@ frv_fetch_objfile_link_map (struct objfile *objfile)
   return 0;
 }
 
-struct target_so_ops frv_so_ops;
+const struct target_so_ops frv_so_ops =
+{
+  frv_relocate_section_addresses,
+  frv_free_so,
+  nullptr,
+  frv_clear_solib,
+  frv_solib_create_inferior_hook,
+  frv_current_sos,
+  open_symbol_file_object,
+  frv_in_dynsym_resolve_code,
+  solib_bfd_open,
+};
 
 void _initialize_frv_solib ();
 void
 _initialize_frv_solib ()
 {
-  frv_so_ops.relocate_section_addresses = frv_relocate_section_addresses;
-  frv_so_ops.free_so = frv_free_so;
-  frv_so_ops.clear_solib = frv_clear_solib;
-  frv_so_ops.solib_create_inferior_hook = frv_solib_create_inferior_hook;
-  frv_so_ops.current_sos = frv_current_sos;
-  frv_so_ops.open_symbol_file_object = open_symbol_file_object;
-  frv_so_ops.in_dynsym_resolve_code = frv_in_dynsym_resolve_code;
-  frv_so_ops.bfd_open = solib_bfd_open;
-
   /* Debug this file's internals.  */
   add_setshow_zuinteger_cmd ("solib-frv", class_maintenance,
 			     &solib_frv_debug, _("\

gdb/solib-svr4.c

@@ -3121,8 +3121,6 @@ svr4_lp64_fetch_link_map_offsets (void)
 }
 
 
-struct target_so_ops svr4_so_ops;
-
 /* Search order for ELF DSOs linked with -Bsymbolic.  Those DSOs have a
    different rule for symbol lookup.  The lookup begins here in the DSO, not in
    the main executable.  */
@@ -3163,24 +3161,28 @@ svr4_iterate_over_objfiles_in_search_order
     }
 }
 
+const struct target_so_ops svr4_so_ops =
+{
+  svr4_relocate_section_addresses,
+  svr4_free_so,
+  svr4_clear_so,
+  svr4_clear_solib,
+  svr4_solib_create_inferior_hook,
+  svr4_current_sos,
+  open_symbol_file_object,
+  svr4_in_dynsym_resolve_code,
+  solib_bfd_open,
+  nullptr,
+  svr4_same,
+  svr4_keep_data_in_core,
+  svr4_update_solib_event_breakpoints,
+  svr4_handle_solib_event,
+};
+
 void _initialize_svr4_solib ();
 void
 _initialize_svr4_solib ()
 {
-  svr4_so_ops.relocate_section_addresses = svr4_relocate_section_addresses;
-  svr4_so_ops.free_so = svr4_free_so;
-  svr4_so_ops.clear_so = svr4_clear_so;
-  svr4_so_ops.clear_solib = svr4_clear_solib;
-  svr4_so_ops.solib_create_inferior_hook = svr4_solib_create_inferior_hook;
-  svr4_so_ops.current_sos = svr4_current_sos;
-  svr4_so_ops.open_symbol_file_object = open_symbol_file_object;
-  svr4_so_ops.in_dynsym_resolve_code = svr4_in_dynsym_resolve_code;
-  svr4_so_ops.bfd_open = solib_bfd_open;
-  svr4_so_ops.same = svr4_same;
-  svr4_so_ops.keep_data_in_core = svr4_keep_data_in_core;
-  svr4_so_ops.update_breakpoints = svr4_update_solib_event_breakpoints;
-  svr4_so_ops.handle_event = svr4_handle_solib_event;
-
   gdb::observers::free_objfile.attach (svr4_free_objfile_observer,
 				       "solib-svr4");
 }

gdb/solib-svr4.h

@@ -25,7 +25,7 @@
 struct objfile;
 struct target_so_ops;
 
-extern struct target_so_ops svr4_so_ops;
+extern const struct target_so_ops svr4_so_ops;
 
 /* Link map info to include in an allocated so_list entry.  */
 

gdb/solib-target.c

@@ -435,22 +435,15 @@ solib_target_in_dynsym_resolve_code (CORE_ADDR pc)
   return in_plt_section (pc);
 }
 
-struct target_so_ops solib_target_so_ops;
-
-void _initialize_solib_target ();
-void
-_initialize_solib_target ()
+const struct target_so_ops solib_target_so_ops =
 {
-  solib_target_so_ops.relocate_section_addresses
-    = solib_target_relocate_section_addresses;
-  solib_target_so_ops.free_so = solib_target_free_so;
-  solib_target_so_ops.clear_solib = solib_target_clear_solib;
-  solib_target_so_ops.solib_create_inferior_hook
-    = solib_target_solib_create_inferior_hook;
-  solib_target_so_ops.current_sos = solib_target_current_sos;
-  solib_target_so_ops.open_symbol_file_object
-    = solib_target_open_symbol_file_object;
-  solib_target_so_ops.in_dynsym_resolve_code
-    = solib_target_in_dynsym_resolve_code;
-  solib_target_so_ops.bfd_open = solib_bfd_open;
-}
+  solib_target_relocate_section_addresses,
+  solib_target_free_so,
+  nullptr,
+  solib_target_clear_solib,
+  solib_target_solib_create_inferior_hook,
+  solib_target_current_sos,
+  solib_target_open_symbol_file_object,
+  solib_target_in_dynsym_resolve_code,
+  solib_bfd_open,
+};

gdb/solib-target.h

@@ -21,6 +21,6 @@
 #define SOLIB_TARGET_H
 
 struct target_so_ops;
-extern struct target_so_ops solib_target_so_ops;
+extern const struct target_so_ops solib_target_so_ops;
 
 #endif /* solib-target.h */

gdb/tic6x-linux-tdep.c

@@ -27,6 +27,7 @@
 #include "elf-bfd.h"
 #include "elf/tic6x.h"
 #include "gdbarch.h"
+#include "solib-dsbt.h"
 
 /* The offset from rt_sigframe pointer to SP register.  */
 #define TIC6X_SP_RT_SIGFRAME 8
@@ -161,7 +162,6 @@ tic6x_linux_syscall_next_pc (struct frame_info *frame)
 }
 
 
-extern struct target_so_ops dsbt_so_ops;
 static void
 tic6x_uclinux_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
 {