(varobj_get_frozen): New.
(varobj_update): New parameter explicit.
* varobj.c (struct varobj): New fields frozen
and not_fetched.
(varobj_set_frozen, varobj_get_frozen): New.
(install_new_value): Don't fetch values for
frozen variable object, or children thereof. Allow
a frozen variable object to have non-fetched value.
(varobj_update): Allow updating child variables.
Don't traverse frozen children.
(new_variable): Initialize the frozen field.
(c_value_of_variable): Return NULL for frozen
variable without any value yet.
* mi/mi-cmd-var.c (varobj_update_one): New parameter
'explicit'.
(mi_cmd_var_create): Output the 'frozen' field,
as soon as testsuite is adjusted to expect that field.
(mi_cmd_var_set_frozen): New.
(mi_cmd_var_update): Pass the 'explicit' parameter to
varobj_update_one.
* mi/mi-cmds.c (mi_cmds): Register '-var-set-frozen'.
* mi/mi-cmds.h (mi_cmd_var_set_frozen): Declare.
(rusage): Declare if HAVE_GETRUSAGE.
(current_command_ts, do_timings): New static variables.
(timestamp, print_diff_now, print_diff, timeval_diff):
New static timing functions.
(mi_cmd_enable_timings): New function for new MI command.
(captured_mi_execute_command, mi_execute_async_cli_command):
Call timing functions.
* mi/mi-cmds.c (mi_cmds): Add entry for new MI command
-enable-timings.
* mi/mi-cmds.h (mi_cmd_enable_timings): New extern.
* mi/mi-parse.h: (mi_timestamp): New structure.
(mi_parse): Add mi_timestamp* member.
* mi-cmds.h (mi_cmd_symbol_list_lines): Add declaration.
* mi-cmds.c (mi_cmds): Add entry for new MI command.
* mi-cmd-symbol.c (mi_cmd_symbol_list_lines): New source file
for all symbol-related commands.
* mi-cmds.c (-environment-directory) Change to use mi_cmd_env_dir,
(-environment-cd): Change to use mi_cmd_env_cd,.
(-environment-pwd): Change to use mi_cmd_env_pwd.
(-environment-path): Change to use mi_cmd_env_path.
* mi-cmds.h (mi_cmd_env_cd, mi_cmd_env_dir): New prototypes.
(mi_cmd_env_path, mi_cmd_env_pwd): Ditto.
* mi-cmd-env.c: New file. Part of fix for PR gdb/741.
* gdbmi.texinfo (environment-cd): Update output and example.
(environment-pwd): Ditto.
(environment-dir): Update output, description, and examples.
(environment-path): Ditto.
* mi-cmds.h: Export mi_cmd_data_write_register_values.
* mi-cmds.c (mi_cmds): Implement data-write-register-values with
mi_cmd_data_write_register_values.
* mi-main.c (mi_cmd_data_write_register_values): New
function. Write a value into a register.
