Constify strings in tracepoint.c, lookup_cmd and the completers.

This is sort of a continuation of Keith's parse_exp_1 constification
patch.  It started out by undoing these bits:

  @@ -754,9 +754,12 @@ validate_actionline (char **line, struct
   	  tmp_p = p;
   	  for (loc = t->base.loc; loc; loc = loc->next)
   	    {
  -	      p = tmp_p;
  -	      exp = parse_exp_1 (&p, loc->address,
  +	      const char *q;
  +
  +	      q = tmp_p;
  +	      exp = parse_exp_1 (&q, loc->address,
   				 block_for_pc (loc->address), 1);
  +	      p = (char *) q;

and progressively making more things const upwards, fixing fallout,
rinse repeat, until GDB built again (--enable-targets=all).

That ended up constifying lookup_cmd/add_cmd and (lots of) friends,
and the completers.

I didn't try to constify the command hooks themselves, because I know
upfront there are commands that write to the command string argument,
and I think I managed to stop at a nice non-hacky split point already.

I think the only non-really-super-obvious changes are
tracepoint.c:validate_actionline, and tracepoint.c:trace_dump_actions.

The rest is just mostly about 'char *' => 'const char *', 'char **'=>
'const char **', and the occasional (e.g., deprecated_cmd_warning)
case of 'char **'=> 'const char *', where/when I noticed that nothing
actually cares about the pointer to pointer output.

Tested on x86_64 Fedora 17, native and gdbserver.

gdb/
2013-03-13  Pedro Alves  <palves@redhat.com>

	* ada-lang.c (struct add_partial_datum) <text, text0, word>: Make
	fields const.
	(ada_make_symbol_completion_list): Make "text0" parameter const.
	* ax-gdb.c (agent_eval_command_one): Make "exp" parameter const.
	* breakpoint.c (condition_completer): Make "text" and "word"
	parameters const.  Adjust.
	(check_tracepoint_command): Adjust to validate_actionline
	prototype change.
	(catch_syscall_completer): Make "text" and "word" parameters
	const.
	* cli/cli-cmds.c (show_user): Make "comname" local const.
	(valid_command_p): Make "command" parameter const.
	(alias_command): Make "alias_prefix" and "command_prefix" locals
	const.
	* cli/cli-decode.c (add_cmd): Make "name" parameter const.
	(add_alias_cmd): Make "name" and "oldname" parameters const.
	Adjust.  No longer make copy of OLDNAME.
	(add_prefix_cmd, add_abbrev_prefix_cmd, add_set_or_show_cmd)
	(add_setshow_cmd_full, add_setshow_enum_cmd)
	(add_setshow_auto_boolean_cmd, add_setshow_boolean_cmd)
	(add_setshow_filename_cmd, add_setshow_string_cmd)
	(add_setshow_string_noescape_cmd)
	(add_setshow_optional_filename_cmd, add_setshow_integer_cmd)
	(add_setshow_uinteger_cmd, add_setshow_zinteger_cmd)
	(add_setshow_zuinteger_unlimited_cmd, add_setshow_zuinteger_cmd)
	(delete_cmd, add_info, add_info_alias, add_com, add_com_alias):
	Make "name" parameter const.
	(help_cmd): Rename "command" parameter to "arg".  New const local
	"command".
	(find_cmd): Make "command" parameter const.
	(lookup_cmd_1): Make "text" parameter pointer to const.  Adjust to
	deprecated_cmd_warning prototype change.
	(undef_cmd_error): Make "cmdtype" parameter const.
	(lookup_cmd): Make "line" parameter const.
	(deprecated_cmd_warning): Change type of "text" parameter to
	pointer to const char, from pointer to pointer to char.  Adjust.
	(lookup_cmd_composition): Make "text" parameter const.
	(complete_on_cmdlist, complete_on_enum): Make "text" and "word"
	parameters const.
	* cli/cli-decode.h (struct cmd_list_element) <name>: Make field
	const.
	* cli/cli-script.c (validate_comname): Make "tem" local const.
	(define_command): New const local "tem_c".  Use it in calls to
	lookup_cmd.
	(document_command): Make "tem" and "comfull" locals const.
	(show_user_1): Make "prefix" and "name" parameters const.
	* cli-script.h (show_user_1): Make "prefix" and "name" parameters
	const.
	* command.h (add_cmd, add_alias_cmd, add_prefix_cmd)
	(add_abbrev_prefix_cmd, completer_ftype, lookup_cmd, lookup_cmd_1)
	(deprecated_cmd_warning, lookup_cmd_composition, add_com)
	(add_com_alias, add_info, add_info_alias, complete_on_cmdlist)
	(complete_on_enum, add_setshow_enum_cmd)
	(add_setshow_auto_boolean_cmd, add_setshow_boolean_cmd)
	(add_setshow_filename_cmd, add_setshow_string_cmd)
	(add_setshow_string_noescape_cmd)
	(add_setshow_optional_filename_cmd, add_setshow_integer_cmd)
	(add_setshow_uinteger_cmd, add_setshow_zinteger_cmd)
	(add_setshow_zuinteger_cmd, add_setshow_zuinteger_unlimited_cmd):
	Change prototypes, constifying strings.
	* completer.c (noop_completer, filename_completer): Make "text"
	and "prefix" parameters const.
	(location_completer, expression_completer)
	(complete_line_internal): Make "text" and "prefix" parameters
	const and adjust.
	(command_completer, signal_completer): Make "text" and "prefix"
	parameters const.
	* completer.h (noop_completer, filename_completer)
	(expression_completer, location_completer, command_completer)
	(signal_completer): Change prototypes.
	* corefile.c (complete_set_gnutarget): Make "text" and "word"
	parameters const.
	* cp-abi.c (cp_abi_completer): Likewise.
	* expression.h (parse_expression_for_completion): Change
	prototype.
	* f-lang.c (f_make_symbol_completion_list): Make "text" and "word"
	parameters const.
	* infcmd.c (_initialize_infcmd): Make "cmd_name" local const.
	* infrun.c (handle_completer): Make "text" and "word" parameters
	const.
	* interps.c (interpreter_completer): Make "text" and "word"
	parameters const.
	* language.h (struct language_defn)
	<la_make_symbol_completion_list>: Make "text" and "word"
	parameters const.
	* parse.c (parse_exp_1): Move const hack to parse_exp_in_context.
	(parse_exp_in_context): Rename to ...
	(parse_exp_in_context_1): ... this.
	(parse_exp_in_context): Reimplement, with const hack from
	parse_exp_1.
	(parse_expression_for_completion): Make "string" parameter const.
	* printcmd.c (decode_format): Make "string_ptr" parameter pointer
	to pointer to const char.  Adjust.
	(print_command_1): Make "exp" parameter const.
	(output_command): Rename to ...
	(output_command_const): ... this.  Make "exp" parameter const.
	(output_command): Reimplement.
	(x_command): Adjust.
	(display_command): Rename "exp" parameter to "arg".  New "exp"
	local, const version of "arg".
	* python/py-auto-load.c (gdbpy_initialize_auto_load): Make
	"cmd_name" local const.
	* python/py-cmd.c (cmdpy_destroyer): Cast const away in xfree
	call.
	(cmdpy_completer): Make "text" and "word" parameters const.
	(gdbpy_parse_command_name): Make "prefix_text2" local const.
	* python/py-param.c (add_setshow_generic): Make "tmp_name" local
	const.
	* remote.c (_initialize_remote): Make "cmd_name" local const.
	* symtab.c (language_search_unquoted_string): Make "text" and "p"
	parameters const.  Adjust.
	(completion_list_add_fields): Make "sym_text", "text" and "word"
	parameters const.
	(struct add_name_data) <sym_text, text, word>: Make fields const.
	(default_make_symbol_completion_list_break_on): Make "text" and
	"word" parameters const.  Adjust locals.
	(default_make_symbol_completion_list)
	(make_symbol_completion_list, make_symbol_completion_type)
	(make_symbol_completion_list_fn): Make "text" and "word"
	parameters const.
	(make_file_symbol_completion_list): Make "text", "word" and
	"srcfile" parameters const.  Adjust locals.
	(add_filename_to_list): Make "text" and "word" parameters const.
	(struct add_partial_filename_data) <text, word>: Make fields
	const.
	(make_source_files_completion_list): Make "text" and "word"
	parameters const.
	* symtab.h (default_make_symbol_completion_list_break_on)
	(default_make_symbol_completion_list, make_symbol_completion_list)
	(make_symbol_completion_type enum type_code)
	(make_symbol_completion_list_fn make_file_symbol_completion_list)
	(make_source_files_completion_list): Change prototype.
	* top.c (execute_command): Adjust to pass pointer to pointer to
	const char to lookup_cmd, and to deprecated_cmd_warning prototype
	change.
	(set_verbose): Make "cmdname" local const.
	* tracepoint.c (decode_agent_options): Make "exp" parameter const,
	and adjust.
	(validate_actionline): Make "line" parameter a pointer to const
	char, and adjust.
	(encode_actions_1): Make "action_exp" local const, and adjust.
	(encode_actions): Adjust.
	(replace_comma): Delete.
	(trace_dump_actions): Make "action_exp" and "next_comma" locals
	const, and adjust.  Don't frob the action string while splitting
	it at commas.  Instead, make a copy of each split substring in
	turn.
	(trace_dump_command): Adjust to validate_actionline prototype
	change.
	* tracepoint.h (decode_agent_options, decode_agent_options)
	(encode_actions, validate_actionline): Change prototypes.
	* valprint.h (output_command): Delete declaration.
	(output_command_const): Declare.
	* value.c (function_destroyer): Cast const away in xfree call.

1 files changed, 26 insertions, 20 deletions

diff --git a/gdb/completer.c b/gdb/completer.c
index 3b14fc9..e132651 100644
--- a/gdb/completer.c
+++ b/gdb/completer.c
@@ -107,7 +107,7 @@ readline_line_completion_function (const char *text, int matches)
    symbols but don't want to complete on anything else either.  */
 VEC (char_ptr) *
 noop_completer (struct cmd_list_element *ignore, 
-		char *text, char *prefix)
+		const char *text, const char *prefix)
 {
   return NULL;
 }
@@ -115,7 +115,7 @@ noop_completer (struct cmd_list_element *ignore,
 /* Complete on filenames.  */
 VEC (char_ptr) *
 filename_completer (struct cmd_list_element *ignore, 
-		    char *text, char *word)
+		    const char *text, const char *word)
 {
   int subsequent_name;
   VEC (char_ptr) *return_val = NULL;
@@ -184,19 +184,19 @@ filename_completer (struct cmd_list_element *ignore,
 
 VEC (char_ptr) *
 location_completer (struct cmd_list_element *ignore, 
-		    char *text, char *word)
+		    const char *text, const char *word)
 {
   int n_syms, n_files, ix;
   VEC (char_ptr) *fn_list = NULL;
   VEC (char_ptr) *list = NULL;
-  char *p;
+  const char *p;
   int quote_found = 0;
   int quoted = *text == '\'' || *text == '"';
   int quote_char = '\0';
-  char *colon = NULL;
+  const char *colon = NULL;
   char *file_to_match = NULL;
-  char *symbol_start = text;
-  char *orig_text = text;
+  const char *symbol_start = text;
+  const char *orig_text = text;
   size_t text_len;
 
   /* Do we have an unquoted colon, as in "break foo.c:bar"?  */
@@ -285,8 +285,10 @@ location_completer (struct cmd_list_element *ignore,
     }
   else
     {
-      for (ix = 0; VEC_iterate (char_ptr, fn_list, ix, p); ++ix)
-	VEC_safe_push (char_ptr, list, p);
+      char *fn;
+
+      for (ix = 0; VEC_iterate (char_ptr, fn_list, ix, fn); ++ix)
+	VEC_safe_push (char_ptr, list, fn);
       VEC_free (char_ptr, fn_list);
     }
 
@@ -296,6 +298,8 @@ location_completer (struct cmd_list_element *ignore,
     }
   else if (n_files)
     {
+      char *fn;
+
       /* If we only have file names as possible completion, we should
 	 bring them in sync with what rl_complete expects.  The
 	 problem is that if the user types "break /foo/b TAB", and the
@@ -311,10 +315,10 @@ location_completer (struct cmd_list_element *ignore,
 	 completion, because rl_complete will prepend "/foo/" to each
 	 candidate completion.  The loop below removes that leading
 	 part.  */
-      for (ix = 0; VEC_iterate (char_ptr, list, ix, p); ++ix)
+      for (ix = 0; VEC_iterate (char_ptr, list, ix, fn); ++ix)
 	{
-	  memmove (p, p + (word - text),
-		   strlen (p) + 1 - (word - text));
+	  memmove (fn, fn + (word - text),
+		   strlen (fn) + 1 - (word - text));
 	}
     }
   else if (!n_syms)
@@ -385,10 +389,11 @@ add_struct_fields (struct type *type, VEC (char_ptr) **output,
    field names.  */
 VEC (char_ptr) *
 expression_completer (struct cmd_list_element *ignore, 
-		      char *text, char *word)
+		      const char *text, const char *word)
 {
   struct type *type = NULL;
-  char *fieldname, *p;
+  char *fieldname;
+  const char *p;
   volatile struct gdb_exception except;
   enum type_code code = TYPE_CODE_UNDEF;
 
@@ -506,11 +511,12 @@ complete_line_internal_reason;
 
 static VEC (char_ptr) *
 complete_line_internal (const char *text, 
-			char *line_buffer, int point,
+			const char *line_buffer, int point,
 			complete_line_internal_reason reason)
 {
   VEC (char_ptr) *list = NULL;
-  char *tmp_command, *p;
+  char *tmp_command;
+  const char *p;
   int ignore_help_classes;
   /* Pointer within tmp_command which corresponds to text.  */
   char *word;
@@ -567,7 +573,7 @@ complete_line_internal (const char *text,
     }
   else if (c == CMD_LIST_AMBIGUOUS)
     {
-      char *q;
+      const char *q;
 
       /* lookup_cmd_1 advances p up to the first ambiguous thing, but
 	 doesn't advance over that thing itself.  Do so now.  */
@@ -682,7 +688,7 @@ complete_line_internal (const char *text,
 		 complete on the command itself, e.g. "p" which is a
 		 command itself but also can complete to "print", "ptype"
 		 etc.  */
-	      char *q;
+	      const char *q;
 
 	      /* Find the command we are completing on.  */
 	      q = p;
@@ -775,7 +781,7 @@ complete_line (const char *text, char *line_buffer, int point)
 /* Complete on command names.  Used by "help".  */
 VEC (char_ptr) *
 command_completer (struct cmd_list_element *ignore, 
-		   char *text, char *word)
+		   const char *text, const char *word)
 {
   return complete_line_internal (word, text, 
 				 strlen (text), handle_help);
@@ -785,7 +791,7 @@ command_completer (struct cmd_list_element *ignore,
 
 VEC (char_ptr) *
 signal_completer (struct cmd_list_element *ignore,
-		  char *text, char *word)
+		  const char *text, const char *word)
 {
   VEC (char_ptr) *return_val = NULL;
   size_t len = strlen (word);