Constify add_com

This changes add_com to take a cmd_const_cfunc_ftype, and then fixes
up all the command implementations.

In most cases this is trivial.

In a couple of places I had to again introduce a temporary non-const
overload.  These overloads will be removed when add_info is
constified.

gdb/ChangeLog
2017-11-07  Tom Tromey  <tom@tromey.com>

	* solib.h (no_shared_libraries): Constify.
	* frame.h (return_command): Constify.
	* cli/cli-cmds.h (quit_command): Constify.
	* top.h (quit_command, execute_command): Constify.
	* target.h (flash_erase_command): Constify.
	* inferior.h (set_inferior_args, attach_command): Constify.
	* tracepoint.h (start_tracing, stop_tracing): Constify.
	* breakpoint.h (break_command, tbreak_command)
	(hbreak_command_wrapper, thbreak_command_wrapper)
	(rbreak_command_wrapper, watch_command_wrapper)
	(awatch_command_wrapper, rwatch_command_wrapper)
	(get_tracepoint_by_number): Constify.
	* symtab.c (info_variables_command, rbreak_command)
	(symtab_symbol_info): Constify.
	(info_variables_command): Add non-const overload.
	* top.c (dont_repeat_command): Constify.
	* breakpoint.c (ignore_command, commands_command)
	(condition_command, tbreak_command, hbreak_command)
	(thbreak_command, clear_command, break_command)
	(info_breakpoints_command, watch_command, rwatch_command)
	(awatch_command, trace_command, ftrace_command, strace_command)
	(trace_pass_command, break_range_command, dprintf_command)
	(agent_printf_command, get_tracepoint_by_number)
	(watch_maybe_just_location, trace_pass_command): Constify.
	(info_breakpoints_command): Add non-const overload.
	* tracefile.c (tsave_command): Constify.
	* infcmd.c (attach_command, disconnect_command, signal_command)
	(queue_signal_command, stepi_command, nexti_command)
	(finish_command, next_command, step_command, until_command)
	(advance_command, jump_command, continue_command, run_command)
	(start_command, starti_command, interrupt_command)
	(run_command_1, set_inferior_args, step_1): Constify.
	* inferior.c (add_inferior_command, remove_inferior_command)
	(clone_inferior_command): Constify.
	* linux-fork.c (checkpoint_command, restart_command): Constify.
	* windows-nat.c (signal_event_command): Constify.
	* guile/guile.c (guile_repl_command, guile_command): Constify.
	* printcmd.c (x_command, display_command, printf_command)
	(output_command, set_command, call_command, print_command)
	(eval_command): Constify.
	(non_const_set_command): Remove.
	(_initialize_printcmd): Update.
	* source.c (forward_search_command, reverse_search_command):
	Constify.
	* jit.c (jit_reader_load_command, jit_reader_unload_command):
	Constify.
	* infrun.c (handle_command): Constify.
	* memattr.c (mem_command): Constify.
	* stack.c (return_command, up_command, up_silently_command)
	(down_command, down_silently_command, frame_command)
	(backtrace_command, func_command, backtrace_command_1): Constify.
	(backtrace_command): Add non-const overload.
	* remote-sim.c (simulator_command): Constify.
	* exec.c (set_section_command): Constify.
	* tracepoint.c (tdump_command, trace_variable_command)
	(tstatus_command, tstop_command, tstart_command)
	(end_actions_pseudocommand, while_stepping_pseudocommand)
	(collect_pseudocommand, teval_pseudocommand, actions_command)
	(start_tracing, stop_tracing): Constify.
	* value.c (init_if_undefined_command): Constify.
	* tui/tui-stack.c (tui_update_command): Constify.
	* tui/tui-win.c (tui_refresh_all_command)
	(tui_set_tab_width_command, tui_set_win_height_command)
	(tui_set_focus_command, tui_scroll_forward_command)
	(tui_scroll_backward_command, tui_scroll_left_command)
	(tui_scroll_right_command, parse_scrolling_args, tui_set_focus)
	(tui_set_win_height): Constify.
	* tui/tui-layout.c (tui_layout_command): Constify.
	* procfs.c (proc_trace_syscalls, proc_trace_sysentry_cmd)
	(proc_trace_sysexit_cmd, proc_untrace_sysentry_cmd)
	(proc_untrace_sysexit_cmd): Constify.
	* remote.c (threadlist_test_cmd, threadinfo_test_cmd)
	(threadset_test_cmd, threadlist_update_test_cmd)
	(threadalive_test): Constify.
	* objc-lang.c (print_object_command): Constify.
	* command.h (add_com): Constify.
	* cli/cli-dump.c (restore_command): Constify.
	* cli/cli-cmds.c (pwd_command, echo_command, quit_command)
	(help_command, complete_command, shell_command, edit_command)
	(list_command, disassemble_command, make_command)
	(apropos_command, alias_command): Constify.
	* cli/cli-script.c (document_command, define_command)
	(while_command, if_command, validate_comname): Constify.
	* cli/cli-decode.c (struct cmd_list_element): Change type of
	"fun".
	* target.c (do_monitor_command, flash_erase_command): Constify.
	* regcache.c (reg_flush_command): Constify.
	* reverse.c (reverse_step, reverse_next, reverse_stepi)
	(reverse_nexti, reverse_continue, reverse_finish)
	(save_bookmark_command, goto_bookmark_command)
	(exec_reverse_once): Constify.
	* python/python.c (python_interactive_command, python_command):
	Constify.
	* typeprint.c (ptype_command, whatis_command, whatis_exp):
	Constify.
	* solib.c (sharedlibrary_command, no_shared_libraries): Constify.
	* gcore.c (gcore_command): Constify.

5 files changed, 33 insertions, 57 deletions

diff --git a/gdb/cli/cli-cmds.c b/gdb/cli/cli-cmds.c
index a8edb1341f..be022d3215 100644
--- a/gdb/cli/cli-cmds.c
+++ b/gdb/cli/cli-cmds.c
@@ -58,24 +58,6 @@
 #include <algorithm>
 #include <string>
 
-/* Prototypes for local command functions */
-
-static void complete_command (char *, int);
-
-static void echo_command (char *, int);
-
-static void pwd_command (char *, int);
-
-static void help_command (char *, int);
-
-static void make_command (char *, int);
-
-static void shell_escape (const char *, int);
-
-static void edit_command (char *, int);
-
-static void list_command (char *, int);
-
 /* Prototypes for local utility functions */
 
 static void print_sal_location (const symtab_and_line &sal);
@@ -238,7 +220,7 @@ show_command (char *arg, int from_tty)
    is ignored.  */
 
 static void
-help_command (char *command, int from_tty)
+help_command (const char *command, int from_tty)
 {
   help_cmd (command, gdb_stdout);
 }
@@ -248,10 +230,8 @@ help_command (char *command, int from_tty)
    [Is that why this function writes output with *_unfiltered?]  */
 
 static void
-complete_command (char *arg_entry, int from_tty)
+complete_command (const char *arg, int from_tty)
 {
-  const char *arg = arg_entry;
-
   dont_repeat ();
 
   if (max_completions == 0)
@@ -356,7 +336,7 @@ show_configuration (const char *args, int from_tty)
 /* Handle the quit command.  */
 
 void
-quit_command (char *args, int from_tty)
+quit_command (const char *args, int from_tty)
 {
   int exit_code = 0;
 
@@ -378,7 +358,7 @@ quit_command (char *args, int from_tty)
 }
 
 static void
-pwd_command (char *args, int from_tty)
+pwd_command (const char *args, int from_tty)
 {
   if (args)
     error (_("The \"pwd\" command does not take an argument: %s"), args);
@@ -693,7 +673,7 @@ source_command (const char *args, int from_tty)
 
 
 static void
-echo_command (char *text, int from_tty)
+echo_command (const char *text, int from_tty)
 {
   const char *p = text;
   int c;
@@ -785,13 +765,13 @@ shell_escape (const char *arg, int from_tty)
 /* Implementation of the "shell" command.  */
 
 static void
-shell_command (char *arg, int from_tty)
+shell_command (const char *arg, int from_tty)
 {
   shell_escape (arg, from_tty);
 }
 
 static void
-edit_command (char *arg, int from_tty)
+edit_command (const char *arg, int from_tty)
 {
   struct symtab_and_line sal;
   struct symbol *sym;
@@ -891,7 +871,7 @@ edit_command (char *arg, int from_tty)
 }
 
 static void
-list_command (char *arg, int from_tty)
+list_command (const char *arg, int from_tty)
 {
   struct symbol *sym;
   const char *arg1;
@@ -899,7 +879,7 @@ list_command (char *arg, int from_tty)
   int dummy_end = 0;
   int dummy_beg = 0;
   int linenum_beg = 0;
-  char *p;
+  const char *p;
 
   /* Pull in the current default source line if necessary.  */
   if (arg == NULL || ((arg[0] == '+' || arg[0] == '-') && arg[1] == '\0'))
@@ -1205,7 +1185,7 @@ disassemble_current_function (gdb_disassembly_flags flags)
    2) File names and contents for all relevant source files are displayed.  */
 
 static void
-disassemble_command (char *arg, int from_tty)
+disassemble_command (const char *arg, int from_tty)
 {
   struct gdbarch *gdbarch = get_current_arch ();
   CORE_ADDR low, high;
@@ -1295,7 +1275,7 @@ disassemble_command (char *arg, int from_tty)
 }
 
 static void
-make_command (char *arg, int from_tty)
+make_command (const char *arg, int from_tty)
 {
   if (arg == 0)
     shell_escape ("make", from_tty);
@@ -1336,7 +1316,7 @@ show_user (const char *args, int from_tty)
    regular expression.  */
 
 static void 
-apropos_command (char *searchstr, int from_tty)
+apropos_command (const char *searchstr, int from_tty)
 {
   if (searchstr == NULL)
     error (_("REGEXP string is empty"));
@@ -1405,11 +1385,11 @@ alias_usage_error (void)
 /* Make an alias of an existing command.  */
 
 static void
-alias_command (char *args, int from_tty)
+alias_command (const char *args, int from_tty)
 {
   int i, alias_argc, command_argc;
   int abbrev_flag = 0;
-  char *equals;
+  const char *equals;
   const char *alias, *command;
 
   if (args == NULL || strchr (args, '=') == NULL)
diff --git a/gdb/cli/cli-cmds.h b/gdb/cli/cli-cmds.h
index 34d19f50c6..14fc93136b 100644
--- a/gdb/cli/cli-cmds.h
+++ b/gdb/cli/cli-cmds.h
@@ -114,7 +114,7 @@ extern void cd_command (const char *, int);
 
 /* Exported to gdb/top.c and gdb/main.c */
 
-extern void quit_command (char *, int);
+extern void quit_command (const char *, int);
 
 extern void source_script (const char *, int);
 
diff --git a/gdb/cli/cli-decode.c b/gdb/cli/cli-decode.c
index 76be7d33f4..e9baf38d13 100644
--- a/gdb/cli/cli-decode.c
+++ b/gdb/cli/cli-decode.c
@@ -931,7 +931,8 @@ add_info_alias (const char *name, const char *oldname, int abbrev_flag)
 /* Add an element to the list of commands.  */
 
 struct cmd_list_element *
-add_com (const char *name, enum command_class theclass, cmd_cfunc_ftype *fun,
+add_com (const char *name, enum command_class theclass,
+	 cmd_const_cfunc_ftype *fun,
 	 const char *doc)
 {
   return add_cmd (name, theclass, fun, doc, &cmdlist);
diff --git a/gdb/cli/cli-dump.c b/gdb/cli/cli-dump.c
index 4eafffac90..3443299e9a 100644
--- a/gdb/cli/cli-dump.c
+++ b/gdb/cli/cli-dump.c
@@ -513,12 +513,11 @@ restore_binary_file (const char *filename, struct callback_data *data)
 }
 
 static void
-restore_command (char *args_in, int from_tty)
+restore_command (const char *args, int from_tty)
 {
   struct callback_data data;
   bfd *ibfd;
   int binary_flag = 0;
-  const char *args = args_in;
 
   if (!target_has_execution)
     noprocess ();
diff --git a/gdb/cli/cli-script.c b/gdb/cli/cli-script.c
index bbdfa4068d..b06dbc286a 100644
--- a/gdb/cli/cli-script.c
+++ b/gdb/cli/cli-script.c
@@ -673,7 +673,7 @@ execute_control_command_untraced (struct command_line *cmd)
    loop condition is nonzero.  */
 
 static void
-while_command (char *arg, int from_tty)
+while_command (const char *arg, int from_tty)
 {
   control_level = 1;
   command_line_up command = get_command_line (while_control, arg);
@@ -690,7 +690,7 @@ while_command (char *arg, int from_tty)
    on the value of the if conditional.  */
 
 static void
-if_command (char *arg, int from_tty)
+if_command (const char *arg, int from_tty)
 {
   control_level = 1;
   command_line_up command = get_command_line (if_control, arg);
@@ -1366,10 +1366,10 @@ copy_command_lines (struct command_line *cmds)
    prefix.  */
 
 static struct cmd_list_element **
-validate_comname (char **comname)
+validate_comname (const char **comname)
 {
   struct cmd_list_element **list = &cmdlist;
-  char *p, *last_word;
+  const char *p, *last_word;
 
   if (*comname == 0)
     error_no_arg (_("name of command to define"));
@@ -1386,19 +1386,16 @@ validate_comname (char **comname)
   if (last_word != *comname)
     {
       struct cmd_list_element *c;
-      char saved_char;
-      const char *tem = *comname;
 
       /* Separate the prefix and the command.  */
-      saved_char = last_word[-1];
-      last_word[-1] = '\0';
+      std::string prefix (*comname, last_word - 1);
+      const char *tem = prefix.c_str ();
 
       c = lookup_cmd (&tem, cmdlist, "", 0, 1);
       if (c->prefixlist == NULL)
-	error (_("\"%s\" is not a prefix command."), *comname);
+	error (_("\"%s\" is not a prefix command."), prefix.c_str ());
 
       list = c->prefixlist;
-      last_word[-1] = saved_char;
       *comname = last_word;
     }
 
@@ -1420,7 +1417,7 @@ user_defined_command (const char *ignore, int from_tty)
 }
 
 static void
-define_command (char *comname, int from_tty)
+define_command (const char *comname, int from_tty)
 {
 #define MAX_TMPBUF 128   
   enum cmd_hook_type
@@ -1430,8 +1427,7 @@ define_command (char *comname, int from_tty)
       CMD_POST_HOOK
     };
   struct cmd_list_element *c, *newc, *hookc = 0, **list;
-  char *tem, *comfull;
-  const char *tem_c;
+  const char *tem, *comfull;
   char tmpbuf[MAX_TMPBUF];
   int  hook_type      = CMD_NO_HOOK;
   int  hook_name_size = 0;
@@ -1445,8 +1441,8 @@ define_command (char *comname, int from_tty)
   list = validate_comname (&comname);
 
   /* Look it up, and verify that we got an exact match.  */
-  tem_c = comname;
-  c = lookup_cmd (&tem_c, *list, "", -1, 1);
+  tem = comname;
+  c = lookup_cmd (&tem, *list, "", -1, 1);
   if (c && strcmp (comname, c->name) != 0)
     c = 0;
 
@@ -1480,8 +1476,8 @@ define_command (char *comname, int from_tty)
   if (hook_type != CMD_NO_HOOK)
     {
       /* Look up cmd it hooks, and verify that we got an exact match.  */
-      tem_c = comname + hook_name_size;
-      hookc = lookup_cmd (&tem_c, *list, "", -1, 0);
+      tem = comname + hook_name_size;
+      hookc = lookup_cmd (&tem, *list, "", -1, 0);
       if (hookc && strcmp (comname + hook_name_size, hookc->name) != 0)
 	hookc = 0;
       if (!hookc)
@@ -1531,11 +1527,11 @@ define_command (char *comname, int from_tty)
 }
 
 static void
-document_command (char *comname, int from_tty)
+document_command (const char *comname, int from_tty)
 {
   struct cmd_list_element *c, **list;
   const char *tem;
-  char *comfull;
+  const char *comfull;
   char tmpbuf[128];
 
   comfull = comname;