f67ffa6a78
The 'frame' command, and thanks to code reuse the 'info frame' and 'select-frame' commands, currently have an overloaded mechanism for selecting a frame. These commands take one or two parameters, if it's one parameter then we first try to use the parameter as an integer to select a frame by level (or depth in the stack). If that fails then we treat the parameter as an address and try to select a stack frame by stack-address. If we still have not selected a stack frame, or we initially had two parameters, then GDB allows the user to view a stack frame that is not part of the current backtrace. Internally, a new frame is created with the given stack and pc addresses, and this is shown to the user. The result of this is that a typo by the user, entering the wrong stack frame level for example, can result in a brand new frame being viewed rather than an error. The purpose of this commit is to remove this overloading, while still offering the same functionality through some new sub-commands. By making the default behaviour of 'frame' (and friends) be to select a stack frame by level index, it is hoped that enough backwards-compatibility is maintained that users will not be overly inconvenienced. The 'frame', 'select-frame', and 'info frame' commands now all take a frame specification string as an argument, this string can be any of the following: (1) An integer. This is treated as a frame level. If a frame for that level does not exist then the user gets an error. (2) A string like 'level <LEVEL>', where <LEVEL> is a frame level as in option (1) above. (3) A string like 'address <STACK-ADDRESS>', where <STACK-ADDRESS> is a stack-frame address. If there is no frame for this address then the user gets an error. (4) A string like 'function <NAME>', where <NAME> is a function name, the inner most frame for function <NAME> is selected. If there is no frame for function <NAME> then the user gets an error. (5) A string like 'view <STACK-ADDRESS>', this views a new frame with stack address <STACK-ADDRESS>. (6) A string like 'view <STACK-ADDRESS> <PC-ADDRESS>', this views a new frame with stack address <STACK-ADDRESS> and the pc <PC-ADDRESS>. This change assumes that the most common use of the commands like 'frame' is to select a frame by frame level, it is for this reason that this is the behaviour that is kept for backwards compatibility. Any of the alternative behaviours, which are assumed to be less used, now require a change in user behaviour. The MI command '-stack-select-frame' has not been changed. This ensures that we maintain backwards compatibility for existing frontends. gdb/ChangeLog: (NEWS): Mention changes to frame related commands. * cli/cli-decode.c (add_cmd_suppress_notification): New function. (add_prefix_cmd_suppress_notification): New function. (add_com_suppress_notification): Call add_cmd_suppress_notification. * command.h (add_cmd_suppress_notification): Declare. (add_prefix_cmd_suppress_notification): Declare. * mi/mi-cmd-stack.c: Add 'safe-ctype.h' include. (parse_frame_specification): Moved from stack.c, with simplification to handle a single argument. (mi_cmd_stack_select_frame): Use parse_frame_specification, the switch to the selected frame. Add a header comment. * stack.c: Remove 'safe-ctype.h' include. (find_frame_for_function): Add declaration. (find_frame_for_address): New function. (parse_frame_specification): Moved into mi/mi-cmd-stack.c. (frame_selection_by_function_completer): New function. (info_frame_command): Rename to... (info_frame_command_core): ...this, and update parameter types. (select_frame_command): Rename to... (select_frame_command_core): ...this, and update parameter types. (frame_command): Rename to... (frame_command_core): ...this, and update parameter types. (class frame_command_helper): New class to wrap implementations of frame related sub-commands. (frame_apply_cmd_list): New static global. (frame_cmd_list): Make static. (select_frame_cmd_list): New global for sub-commands. (info_frame_cmd_list): New global for sub-commands. (_initialize_stack): Register sub-commands for 'frame', 'select-frame', and 'info frame'. Update 'frame apply' commands to use frame_apply_cmd_list. Move function local static frame_apply_list to file static frame_apply_cmd_list for consistency. * stack.h (select_frame_command): Delete declarationn. (select_frame_for_mi): Declare new function. gdb/doc/ChangeLog: * gdb.texinfo (Frames): Rewrite the description of 'frame number' to highlight that the number is also the frame's level. (Selection): Rewrite documentation for 'frame' and 'select-frame' commands. (Frame Info): Rewrite documentation for 'info frame' command. gdb/testsuite/ChangeLog: * gdb.base/frame-selection.exp: New file. * gdb.base/frame-selection.c: New file.
473 lines
17 KiB
C
473 lines
17 KiB
C
/* Header file for command creation.
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Copyright (C) 1986-2018 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#if !defined (COMMAND_H)
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#define COMMAND_H 1
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#include "gdb_vecs.h"
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#include "common/scoped_restore.h"
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struct completion_tracker;
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/* This file defines the public interface for any code wanting to
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create commands. */
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/* Command classes are top-level categories into which commands are
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broken down for "help" purposes.
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Notes on classes: class_alias is for alias commands which are not
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abbreviations of the original command. class-pseudo is for
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commands which are not really commands nor help topics ("stop"). */
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enum command_class
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{
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/* Special args to help_list */
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class_deprecated = -3, all_classes = -2, all_commands = -1,
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/* Classes of commands */
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no_class = -1, class_run = 0, class_vars, class_stack, class_files,
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class_support, class_info, class_breakpoint, class_trace,
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class_alias, class_bookmark, class_obscure, class_maintenance,
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class_pseudo, class_tui, class_user, class_xdb,
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no_set_class /* Used for "show" commands that have no corresponding
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"set" command. */
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};
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/* FIXME: cagney/2002-03-17: Once cmd_type() has been removed, ``enum
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cmd_types'' can be moved from "command.h" to "cli-decode.h". */
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/* Not a set/show command. Note that some commands which begin with
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"set" or "show" might be in this category, if their syntax does
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not fall into one of the following categories. */
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typedef enum cmd_types
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{
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not_set_cmd,
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set_cmd,
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show_cmd
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}
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cmd_types;
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/* Types of "set" or "show" command. */
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typedef enum var_types
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{
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/* "on" or "off". *VAR is an integer which is nonzero for on,
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zero for off. */
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var_boolean,
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/* "on" / "true" / "enable" or "off" / "false" / "disable" or
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"auto. *VAR is an ``enum auto_boolean''. NOTE: In general a
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custom show command will need to be implemented - one that for
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"auto" prints both the "auto" and the current auto-selected
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value. */
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var_auto_boolean,
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/* Unsigned Integer. *VAR is an unsigned int. The user can type
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0 to mean "unlimited", which is stored in *VAR as UINT_MAX. */
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var_uinteger,
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/* Like var_uinteger but signed. *VAR is an int. The user can
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type 0 to mean "unlimited", which is stored in *VAR as
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INT_MAX. The only remaining use of it is the Python API.
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Don't use it elsewhere. */
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var_integer,
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/* String which the user enters with escapes (e.g. the user types
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\n and it is a real newline in the stored string).
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*VAR is a malloc'd string, or NULL if the string is empty. */
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var_string,
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/* String which stores what the user types verbatim.
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*VAR is a malloc'd string, or NULL if the string is empty. */
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var_string_noescape,
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/* String which stores a filename. (*VAR) is a malloc'd string,
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or "" if the string was empty. */
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var_optional_filename,
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/* String which stores a filename. (*VAR) is a malloc'd
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string. */
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var_filename,
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/* ZeroableInteger. *VAR is an int. Like var_integer except
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that zero really means zero. */
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var_zinteger,
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/* ZeroableUnsignedInteger. *VAR is an unsigned int. Zero really
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means zero. */
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var_zuinteger,
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/* ZeroableUnsignedInteger with unlimited value. *VAR is an int,
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but its range is [0, INT_MAX]. -1 stands for unlimited and
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other negative numbers are not allowed. */
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var_zuinteger_unlimited,
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/* Enumerated type. Can only have one of the specified values.
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*VAR is a char pointer to the name of the element that we
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find. */
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var_enum
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}
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var_types;
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/* This structure records one command'd definition. */
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struct cmd_list_element;
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typedef void cmd_const_cfunc_ftype (const char *args, int from_tty);
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/* This structure specifies notifications to be suppressed by a cli
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command interpreter. */
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struct cli_suppress_notification
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{
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/* Inferior, thread, frame selected notification suppressed? */
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int user_selected_context;
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};
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extern struct cli_suppress_notification cli_suppress_notification;
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/* Forward-declarations of the entry-points of cli/cli-decode.c. */
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/* API to the manipulation of command lists. */
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extern int valid_user_defined_cmd_name_p (const char *name);
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/* Const-correct variant of the above. */
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extern struct cmd_list_element *add_cmd (const char *, enum command_class,
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cmd_const_cfunc_ftype *fun,
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const char *,
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struct cmd_list_element **);
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/* Like add_cmd, but no command function is specified. */
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extern struct cmd_list_element *add_cmd (const char *, enum command_class,
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const char *,
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struct cmd_list_element **);
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extern struct cmd_list_element *add_cmd_suppress_notification
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(const char *name, enum command_class theclass,
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cmd_const_cfunc_ftype *fun, const char *doc,
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struct cmd_list_element **list,
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int *suppress_notification);
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extern struct cmd_list_element *add_alias_cmd (const char *, const char *,
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enum command_class, int,
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struct cmd_list_element **);
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extern struct cmd_list_element *add_alias_cmd (const char *,
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cmd_list_element *,
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enum command_class, int,
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struct cmd_list_element **);
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extern struct cmd_list_element *add_prefix_cmd (const char *, enum command_class,
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cmd_const_cfunc_ftype *fun,
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const char *,
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struct cmd_list_element **,
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const char *, int,
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struct cmd_list_element **);
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extern struct cmd_list_element *add_prefix_cmd_suppress_notification
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(const char *name, enum command_class theclass,
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cmd_const_cfunc_ftype *fun,
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const char *doc, struct cmd_list_element **prefixlist,
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const char *prefixname, int allow_unknown,
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struct cmd_list_element **list,
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int *suppress_notification);
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extern struct cmd_list_element *add_abbrev_prefix_cmd (const char *,
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enum command_class,
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cmd_const_cfunc_ftype *fun,
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const char *,
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struct cmd_list_element
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**, const char *, int,
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struct cmd_list_element
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**);
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typedef void cmd_const_sfunc_ftype (const char *args, int from_tty,
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struct cmd_list_element *c);
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extern void set_cmd_sfunc (struct cmd_list_element *cmd,
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cmd_const_sfunc_ftype *sfunc);
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/* A completion routine. Add possible completions to tracker.
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TEXT is the text beyond what was matched for the command itself
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(leading whitespace is skipped). It stops where we are supposed to
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stop completing (rl_point) and is '\0' terminated. WORD points in
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the same buffer as TEXT, and completions should be returned
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relative to this position. For example, suppose TEXT is "foo" and
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we want to complete to "foobar". If WORD is "oo", return "oobar";
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if WORD is "baz/foo", return "baz/foobar". */
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typedef void completer_ftype (struct cmd_list_element *,
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completion_tracker &tracker,
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const char *text, const char *word);
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/* Same, but for set_cmd_completer_handle_brkchars. */
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typedef void completer_handle_brkchars_ftype (struct cmd_list_element *,
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completion_tracker &tracker,
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const char *text, const char *word);
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extern void set_cmd_completer (struct cmd_list_element *, completer_ftype *);
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/* Set the completer_handle_brkchars callback. */
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extern void set_cmd_completer_handle_brkchars (struct cmd_list_element *,
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completer_handle_brkchars_ftype *);
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/* HACK: cagney/2002-02-23: Code, mostly in tracepoints.c, grubs
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around in cmd objects to test the value of the commands sfunc(). */
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extern int cmd_cfunc_eq (struct cmd_list_element *cmd,
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cmd_const_cfunc_ftype *cfun);
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/* Each command object has a local context attached to it. */
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extern void set_cmd_context (struct cmd_list_element *cmd,
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void *context);
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extern void *get_cmd_context (struct cmd_list_element *cmd);
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/* Execute CMD's pre/post hook. Throw an error if the command fails.
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If already executing this pre/post hook, or there is no pre/post
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hook, the call is silently ignored. */
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extern void execute_cmd_pre_hook (struct cmd_list_element *cmd);
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extern void execute_cmd_post_hook (struct cmd_list_element *cmd);
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/* Return the type of the command. */
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extern enum cmd_types cmd_type (struct cmd_list_element *cmd);
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/* Flag for an ambiguous cmd_list result. */
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#define CMD_LIST_AMBIGUOUS ((struct cmd_list_element *) -1)
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extern struct cmd_list_element *lookup_cmd (const char **,
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struct cmd_list_element *,
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const char *,
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int, int);
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extern struct cmd_list_element *lookup_cmd_1 (const char **,
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struct cmd_list_element *,
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struct cmd_list_element **,
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int);
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extern struct cmd_list_element *deprecate_cmd (struct cmd_list_element *,
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const char * );
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extern void deprecated_cmd_warning (const char *);
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extern int lookup_cmd_composition (const char *text,
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struct cmd_list_element **alias,
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struct cmd_list_element **prefix_cmd,
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struct cmd_list_element **cmd);
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extern struct cmd_list_element *add_com (const char *, enum command_class,
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cmd_const_cfunc_ftype *fun,
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const char *);
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extern struct cmd_list_element *add_com_alias (const char *, const char *,
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enum command_class, int);
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extern struct cmd_list_element *add_com_suppress_notification
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(const char *name, enum command_class theclass,
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cmd_const_cfunc_ftype *fun, const char *doc,
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int *supress_notification);
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extern struct cmd_list_element *add_info (const char *,
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cmd_const_cfunc_ftype *fun,
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const char *);
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extern struct cmd_list_element *add_info_alias (const char *, const char *,
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int);
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extern void complete_on_cmdlist (struct cmd_list_element *,
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completion_tracker &tracker,
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const char *, const char *, int);
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extern void complete_on_enum (completion_tracker &tracker,
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const char *const *enumlist,
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const char *, const char *);
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/* Functions that implement commands about CLI commands. */
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extern void help_list (struct cmd_list_element *, const char *,
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enum command_class, struct ui_file *);
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/* Method for show a set/show variable's VALUE on FILE. If this
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method isn't supplied deprecated_show_value_hack() is called (which
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is not good). */
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typedef void (show_value_ftype) (struct ui_file *file,
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int from_tty,
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struct cmd_list_element *cmd,
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const char *value);
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/* NOTE: i18n: This function is not i18n friendly. Callers should
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instead print the value out directly. */
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extern show_value_ftype deprecated_show_value_hack;
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extern void add_setshow_enum_cmd (const char *name,
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enum command_class theclass,
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const char *const *enumlist,
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const char **var,
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const char *set_doc,
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const char *show_doc,
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const char *help_doc,
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cmd_const_sfunc_ftype *set_func,
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show_value_ftype *show_func,
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struct cmd_list_element **set_list,
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struct cmd_list_element **show_list);
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extern void add_setshow_auto_boolean_cmd (const char *name,
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enum command_class theclass,
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enum auto_boolean *var,
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const char *set_doc,
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const char *show_doc,
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const char *help_doc,
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cmd_const_sfunc_ftype *set_func,
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show_value_ftype *show_func,
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struct cmd_list_element **set_list,
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struct cmd_list_element **show_list);
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extern void add_setshow_boolean_cmd (const char *name,
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enum command_class theclass,
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int *var,
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const char *set_doc, const char *show_doc,
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const char *help_doc,
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cmd_const_sfunc_ftype *set_func,
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show_value_ftype *show_func,
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struct cmd_list_element **set_list,
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struct cmd_list_element **show_list);
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extern void add_setshow_filename_cmd (const char *name,
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enum command_class theclass,
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char **var,
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const char *set_doc,
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const char *show_doc,
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const char *help_doc,
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cmd_const_sfunc_ftype *set_func,
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show_value_ftype *show_func,
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struct cmd_list_element **set_list,
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struct cmd_list_element **show_list);
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extern void add_setshow_string_cmd (const char *name,
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enum command_class theclass,
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char **var,
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const char *set_doc,
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const char *show_doc,
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const char *help_doc,
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cmd_const_sfunc_ftype *set_func,
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show_value_ftype *show_func,
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struct cmd_list_element **set_list,
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struct cmd_list_element **show_list);
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extern struct cmd_list_element *add_setshow_string_noescape_cmd
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(const char *name,
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enum command_class theclass,
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char **var,
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const char *set_doc,
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const char *show_doc,
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const char *help_doc,
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cmd_const_sfunc_ftype *set_func,
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show_value_ftype *show_func,
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struct cmd_list_element **set_list,
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struct cmd_list_element **show_list);
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extern void add_setshow_optional_filename_cmd (const char *name,
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enum command_class theclass,
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char **var,
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const char *set_doc,
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const char *show_doc,
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const char *help_doc,
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cmd_const_sfunc_ftype *set_func,
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show_value_ftype *show_func,
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struct cmd_list_element **set_list,
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struct cmd_list_element **show_list);
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extern void add_setshow_integer_cmd (const char *name,
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enum command_class theclass,
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int *var,
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const char *set_doc,
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const char *show_doc,
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const char *help_doc,
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cmd_const_sfunc_ftype *set_func,
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show_value_ftype *show_func,
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struct cmd_list_element **set_list,
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struct cmd_list_element **show_list);
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extern void add_setshow_uinteger_cmd (const char *name,
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enum command_class theclass,
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unsigned int *var,
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const char *set_doc,
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const char *show_doc,
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const char *help_doc,
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cmd_const_sfunc_ftype *set_func,
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show_value_ftype *show_func,
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struct cmd_list_element **set_list,
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struct cmd_list_element **show_list);
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extern void add_setshow_zinteger_cmd (const char *name,
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enum command_class theclass,
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int *var,
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const char *set_doc,
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const char *show_doc,
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const char *help_doc,
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cmd_const_sfunc_ftype *set_func,
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show_value_ftype *show_func,
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struct cmd_list_element **set_list,
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struct cmd_list_element **show_list);
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extern void add_setshow_zuinteger_cmd (const char *name,
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enum command_class theclass,
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unsigned int *var,
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const char *set_doc,
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const char *show_doc,
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const char *help_doc,
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cmd_const_sfunc_ftype *set_func,
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show_value_ftype *show_func,
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struct cmd_list_element **set_list,
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struct cmd_list_element **show_list);
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extern void
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add_setshow_zuinteger_unlimited_cmd (const char *name,
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enum command_class theclass,
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int *var,
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const char *set_doc,
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const char *show_doc,
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const char *help_doc,
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cmd_const_sfunc_ftype *set_func,
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show_value_ftype *show_func,
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struct cmd_list_element **set_list,
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struct cmd_list_element **show_list);
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/* Do a "show" command for each thing on a command list. */
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extern void cmd_show_list (struct cmd_list_element *, int, const char *);
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/* Used everywhere whenever at least one parameter is required and
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none is specified. */
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extern void error_no_arg (const char *) ATTRIBUTE_NORETURN;
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extern void dont_repeat (void);
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extern scoped_restore_tmpl<int> prevent_dont_repeat (void);
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/* Set the arguments that will be passed if the current command is
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repeated. Note that the passed-in string must be a constant. */
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extern void set_repeat_arguments (const char *args);
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/* Used to mark commands that don't do anything. If we just leave the
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function field NULL, the command is interpreted as a help topic, or
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as a class of commands. */
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extern void not_just_help_class_command (const char *, int);
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/* Check function pointer. */
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extern int cmd_func_p (struct cmd_list_element *cmd);
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/* Call the command function. */
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extern void cmd_func (struct cmd_list_element *cmd,
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const char *args, int from_tty);
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#endif /* !defined (COMMAND_H) */
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