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fece451c2a
This avoids using a thread-local extern variable, which causes link errors on some platforms, notably Cygwin. But I think this is a better pattern even outside of working around linker bugs because it encapsulates direct access to the variable inside the class, instead of having a global extern variable. The cygwin link error is: cp-support.o: in function `gdb_demangle(char const*, int)': /home/Christian/binutils-gdb/obj/gdb/../../gdb/cp-support.c:1619:(.text+0x6472): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `TLS init function for thread_local_segv_handler' /home/Christian/binutils-gdb/obj/gdb/../../gdb/cp-support.c:1619:(.text+0x648b): relocation truncated to fit: R_X86_64_PC32 against undefined symbol `TLS init function for thread_local_segv_handler' collect2: error: ld returned 1 exit status 2021-03-12 Christian Biesinger <cbiesinger@google.com> PR threads/27239 * cp-support.c: Use scoped_segv_handler_restore. * event-top.c (thread_local_segv_handler): Made static. (scoped_segv_handler_restore::scoped_segv_handler_restore): New function. (scoped_segv_handler_restore::~scoped_segv_handler_restore): New function. * event-top.h (class scoped_segv_handler_restore): New class. (thread_local_segv_handler): Removed.
89 lines
2.9 KiB
C++
89 lines
2.9 KiB
C++
/* Definitions used by event-top.c, for GDB, the GNU debugger.
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Copyright (C) 1999-2021 Free Software Foundation, Inc.
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Written by Elena Zannoni <ezannoni@cygnus.com> of Cygnus Solutions.
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This file is part of GDB.
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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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#ifndef EVENT_TOP_H
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#define EVENT_TOP_H
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#include <signal.h>
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struct cmd_list_element;
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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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extern void display_gdb_prompt (const char *new_prompt);
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extern void gdb_setup_readline (int);
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extern void gdb_disable_readline (void);
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extern void async_init_signals (void);
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extern void change_line_handler (int);
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extern void command_line_handler (gdb::unique_xmalloc_ptr<char> &&rl);
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extern void command_handler (const char *command);
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#ifdef SIGTSTP
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extern void handle_sigtstp (int sig);
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#endif
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extern void handle_sigint (int sig);
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extern void handle_sigterm (int sig);
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extern void async_request_quit (void *arg);
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extern void stdin_event_handler (int error, void *client_data);
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extern void async_disable_stdin (void);
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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 bool set_editing_cmd_var;
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extern bool exec_done_display_p;
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extern struct prompts the_prompts;
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extern void (*after_char_processing_hook) (void);
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extern int call_stdin_event_handler_again_p;
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extern void gdb_readline_no_editing_callback (void *client_data);
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/* Wrappers for rl_callback_handler_remove and
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rl_callback_handler_install that keep track of whether the callback
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handler is installed in readline. Do not call the readline
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versions directly. */
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extern void gdb_rl_callback_handler_remove (void);
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extern void gdb_rl_callback_handler_install (const char *prompt);
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/* Reinstall the readline callback handler (with no prompt), if not
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currently installed. */
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extern void gdb_rl_callback_handler_reinstall (void);
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typedef void (*segv_handler_t) (int);
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/* On construction, replaces the current thread's SIGSEGV handler with
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the provided one. On destruction, restores the handler to the
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original one. */
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class scoped_segv_handler_restore
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{
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public:
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scoped_segv_handler_restore (segv_handler_t new_handler);
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~scoped_segv_handler_restore ();
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private:
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segv_handler_t m_old_handler;
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};
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#endif
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