binutils-gdb/gdb/event-top.h

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/* Definitions used by event-top.c, for GDB, the GNU debugger.
Copyright (C) 1999-2015 Free Software Foundation, Inc.
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Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions.
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
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(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/>. */
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#ifndef EVENT_TOP_H
#define EVENT_TOP_H
struct cmd_list_element;
2011-01-07 Michael Snyder <msnyder@vmware.com> * ada-lang.c: Comment cleanup, mostly periods and spaces. * ada-lang.h: Ditto. * ada-tasks.c: Ditto. * ada-valprint.c: Ditto. * aix-threads.c: Ditto. * alpha-linux-nat.c: Ditto. * alpha-linux-tdep.c: Ditto. * alpha-mdebug-tdep.c: Ditto. * alpha-nat.c: Ditto. * alpha-osf1-tdep.c: Ditto. * alpha-tdep.c: Ditto. * alphabsd-nat.c: Ditto. * alphabsd-tdep.c: Ditto. * amd64-darwin-tdep.c: Ditto. * amd64-linux-nat.c: Ditto. * amd64-linux-tdep.c: Ditto. * amd64-sol2-tdep.c: Ditto. * amd64-tdep.c: Ditto. * amd64-fbsd-tdep.c: Ditto. * amd64-nbsd-tdep.c: Ditto. * amd64-obsd-tdep.c: Ditto. * amd64-linux-nat.c: Ditto. * amd64-linux-tdep.c: Ditto. * arm-tdep.c: Ditto. * arm-tdep.h: Ditto. * armnbsd-nat.c: Ditto. * avr-tdep.c: Ditto. * bfin-tdep.c: Ditto. * bsd-kvm.c: Ditto. * c-typeprintc: Ditto. * c-valprint.c: Ditto. * coff-pe-read.h: Ditto. * coffreead.c: Ditto. * cris-tdep.c: Ditto. * d-lang.c: Ditto. * darwin-nat-info.c: Ditto. * darwin-nat.c: Ditto. * dbug-rom.c: Ditto. * dbxread.c: Ditto. * dcache.c: Ditto. * dcache.h: Ditto. * dec-thread.c: Ditto. * defs.h: Ditto. * demangle.c: Ditto. * dicos-tdep.c: Ditto. * dictionary.c: Ditto. * dictionary.h: Ditto. * dink32-rom.c: Ditto. * disasm.c: Ditto. * doublest.c: Ditto. * dsrec.c: Ditto. * dummy-frame.c: Ditto. * dwarf2-frame.c: Ditto. * dwarf2expr.c: Ditto. * dwarf2loc.c: Ditto. * dwarf2read.c: Ditto. * elfread.c: Ditto. * environ.c: Ditto. * eval.c: Ditto. * event-top.h: Ditto. * exceptions.c: Ditto. * exceptions.h: Ditto. * exec.c: Ditto. * expprint.c: Ditto. * expression.h: Ditto. * f-exp.y: Ditto. * f-lang.c: Ditto. * f-lang.h: Ditto. * f-typeprint.c: Ditto. * f-valprint.c: Ditto. * fbsd-nat.c: Ditto. * findvar.c: Ditto. * fork-child.c: Ditto. * frame.c: Ditto. * frame.h: Ditto. * frv-linux-tdep.c: Ditto. * frv-tdep.c: Ditto. * gcore.c: Ditto. * gdb-stabs.h: Ditto. * gdb_assert.h: Ditto. * gdb_string.h: Ditto. * gdb_thread_db.h: Ditto. * gdb_wait.h: Ditto. * gdbarch.sh: Ditto. * gdbcore.h: Ditto. * gdbthread.h: Ditto. * gdbtypes.c: Ditto. * gdbtypes.h: Ditto. * gnu-nat.c: Ditto. * gnu-nat.h: Ditto. * gnu-v2-abi.c: Ditto. * gnu-v3-abi.c: Ditto. * go32-nat.c: Ditto. * gdbarch.c: Regenerate. * gdbarch.h: Regenerate.
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/* Exported functions from event-top.c.
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FIXME: these should really go into top.h. */
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Fix build with Python 3.4 (PR python/16784) The type of the function pointer PyOS_ReadlineFunctionPointer (part of the Python C API), which we use, slightly changed starting with Python 3.4. The signature went from PyAPI_DATA(char) *(*PyOS_ReadlineFunctionPointer)(FILE *, FILE *, char *); to PyAPI_DATA(char) *(*PyOS_ReadlineFunctionPointer)(FILE *, FILE *, const char *); The parameter that changed is the prompt text. This commits adjust gdb accordingly by making the prompt_arg parameter const, as well as the fallouts of that. I needed to rework how annotations are added to the prompt, since the it is now const. If annotations are enabled, it will make a copy of the prompt overwrite the prompt variable that is used throughout the function. Otherwise, no copy is done and the original prompt_arg value is passed. I changed the signature of deprecated_readline_hook. I would've changed any user of it, but it seems like nothing is using it, Built-tested with python 2.7.x, 3.3.y and 3.4.z. gdb/ChangeLog: * defs.h (gdb_readline): Constify argument. (gdb_readline_wrapper): Same. (command_line_input): Same. (deprecated_readline_hook): Same. * top.c (deprecated_readline_hook): Same. (gdb_readline): Same. (gdb_readline_wrapper): Same. (command_line_input): Constify argument. Pass prompt to called functions instead of local_prompt, overwriting prompt if using annotations. * event-top.h (display_gdb_prompt): Constify argument. * event-top.c (display_gdb_prompt): Same. * python/py-gdb-readline.c (gdbpy_readline_wrapper): Constify argument if building with Python 3.4 and up. Signed-off-by: Simon Marchi <simon.marchi@ericsson.com>
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extern void display_gdb_prompt (const char *new_prompt);
void gdb_setup_readline (void);
void gdb_disable_readline (void);
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extern void async_init_signals (void);
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extern void set_async_editing_command (char *args, int from_tty,
struct cmd_list_element *c);
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/* Signal to catch ^Z typed while reading a command: SIGTSTP or SIGCONT. */
#ifndef STOP_SIGNAL
#include <signal.h>
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#ifdef SIGTSTP
#define STOP_SIGNAL SIGTSTP
extern void handle_stop_sig (int sig);
#endif
#endif
extern void handle_sigint (int sig);
extern void handle_sigterm (int sig);
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extern void gdb_readline2 (void *client_data);
extern void async_request_quit (void *arg);
extern void stdin_event_handler (int error, void *client_data);
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extern void async_disable_stdin (void);
extern void async_enable_stdin (void);
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/* Exported variables from event-top.c.
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FIXME: these should really go into top.h. */
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extern int async_command_editing_p;
extern int exec_done_display_p;
extern char *async_annotation_suffix;
extern struct prompts the_prompts;
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extern void (*call_readline) (void *);
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extern void (*input_handler) (char *);
extern int input_fd;
extern void (*after_char_processing_hook) (void);
Fix the processing of Meta-key commands in TUI This patch fixes the annoying bug where key sequences such as Alt_F or Alt_B (go forward or backwards by a word) do not behave promptly in TUI. You have to press a third key in order for the key sequence to register. This is mostly ncurses' fault. Calling wgetch() normally causes ncurses to read only a single key from stdin. However if the key read is the start-sequence key (^[ a.k.a. ESC) then wgetch() reads TWO keys from stdin, storing the 2nd key into an internal FIFO buffer and returning the start-sequence key. The extraneous read of the 2nd key makes us miss its corresponding stdin event, so the event loop blocks until a third key is pressed. This explains why such key sequences do not behave promptly in TUI. To fix this issue, we must somehow compensate for the missed stdin event corresponding to the 2nd byte of a key sequence. This patch achieves this by hacking up the stdin event handler to conditionally execute the readline callback multiple times in a row. This is done via a new global variable, call_stdin_event_handler_again_p, which is set from tui_getc() when we receive a start-sequence key and notice extra pending input in the ncurses buffer. Tested on x86_64-unknown-linux-gnu. gdb/ChangeLog: * event-top.h (call_stdin_event_handler_again_p): Declare. * event-top.c (call_stdin_event_handler_again_p): Define. (stdin_event_handler): Use it. * tui/tui-io.c (tui_getc): Prepare to call the stdin event handler again if there is pending input following a start sequence.
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extern int call_stdin_event_handler_again_p;
PR python/17372 - Python hangs when displaying help() This is more of a readline/terminal issue than a Python one. PR17372 is a regression in 7.8 caused by the fix for PR17072: commit 0017922d0292d8c374584f6100874580659c9973 Author: Pedro Alves <palves@redhat.com> Date: Mon Jul 14 19:55:32 2014 +0100 Background execution + pagination aborts readline/gdb gdb_readline_wrapper_line removes the handler after a line is processed. Usually, we'll end up re-displaying the prompt, and that reinstalls the handler. But if the output is coming out of handling a stop event, we don't re-display the prompt, and nothing restores the handler. So the next input wakes up the event loop and calls into readline, which aborts. ... gdb/ 2014-07-14 Pedro Alves <palves@redhat.com> PR gdb/17072 * top.c (gdb_readline_wrapper_line): Tweak comment. (gdb_readline_wrapper_cleanup): If readline is enabled, reinstall the input handler callback. The problem is that installing the input handler callback also preps the terminal, putting it in raw mode and with echo disabled, which is bad if we're going to call a command that assumes cooked/canonical mode, and echo enabled, like in the case of the PR, Python's interactive shell. Another example I came up with that doesn't depend on Python is starting a subshell with "(gdb) shell /bin/sh" from a multi-line command. Tests covering both these examples are added. The fix is to revert the original fix for PR gdb/17072, and instead restore the callback handler after processing an asynchronous target event. Furthermore, calling rl_callback_handler_install when we already have some input in readline's line buffer discards that input, which is obviously a bad thing to do while the user is typing. No specific test is added for that, because I first tried calling it even if the callback handler was still installed and that resulted in hundreds of failures in the testsuite. gdb/ 2014-10-29 Pedro Alves <palves@redhat.com> PR python/17372 * event-top.c (change_line_handler): Call gdb_rl_callback_handler_remove instead of rl_callback_handler_remove. (callback_handler_installed): New global. (gdb_rl_callback_handler_remove, gdb_rl_callback_handler_install) (gdb_rl_callback_handler_reinstall): New functions. (display_gdb_prompt): Call gdb_rl_callback_handler_remove and gdb_rl_callback_handler_install instead of rl_callback_handler_remove and rl_callback_handler_install. (gdb_disable_readline): Call gdb_rl_callback_handler_remove instead of rl_callback_handler_remove. * event-top.h (gdb_rl_callback_handler_remove) (gdb_rl_callback_handler_install) (gdb_rl_callback_handler_reinstall): New declarations. * infrun.c (reinstall_readline_callback_handler_cleanup): New cleanup function. (fetch_inferior_event): Install it. * top.c (gdb_readline_wrapper_line) Call gdb_rl_callback_handler_remove instead of rl_callback_handler_remove. (gdb_readline_wrapper_cleanup): Don't call rl_callback_handler_install. gdb/testsuite/ 2014-10-29 Pedro Alves <palves@redhat.com> PR python/17372 * gdb.python/python.exp: Test a multi-line command that spawns interactive Python. * gdb.base/multi-line-starts-subshell.exp: New file.
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/* Wrappers for rl_callback_handler_remove and
rl_callback_handler_install that keep track of whether the callback
handler is installed in readline. Do not call the readline
versions directly. */
extern void gdb_rl_callback_handler_remove (void);
extern void gdb_rl_callback_handler_install (const char *prompt);
/* Reinstall the readline callback handler (with no prompt), if not
currently installed. */
extern void gdb_rl_callback_handler_reinstall (void);
extern void cli_command_loop (void *);
#endif