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From: Tom Tromey <tromey@sourceware.org> To: gdb-cvs@sourceware.org Subject: [binutils-gdb] Replace deprecated_target_wait_hook by observers Date: Mon, 14 Mar 2022 13:53:45 +0000 (GMT) [thread overview] Message-ID: <20220314135345.32F3B3865C28@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=fb85cece22a2cb3c0185e61cfc1323e9c5a6466e commit fb85cece22a2cb3c0185e61cfc1323e9c5a6466e Author: Patrick Monnerat <patrick@monnerat.net> Date: Sat Mar 12 13:41:47 2022 +0100 Replace deprecated_target_wait_hook by observers Commit b60cea7 (Make target_wait options use enum flags) broke deprecated_target_wait_hook usage: there's a commit comment telling this hook has not been converted. Rather than trying to mend it, this patch replaces the hook by two target_wait observers: target_pre_wait (ptid_t ptid) target_post_wait (ptid_t event_ptid) Upon target_wait entry, target_pre_wait is notified with the ptid passed to target_wait. Upon exit, target_post_wait is notified with the event ptid returned by target_wait. Should an exception occur, event_ptid is null_ptid. This change benefits to Insight (out-of-tree): there's no real use of the late hook in gdb itself. Diff: --- gdb/infrun.c | 15 +++------------ gdb/infrun.h | 5 ++--- gdb/interps.c | 1 - gdb/observable.c | 2 ++ gdb/observable.h | 6 ++++++ gdb/target.c | 14 +++++++++++++- gdb/top.c | 7 ------- 7 files changed, 26 insertions(+), 24 deletions(-) diff --git a/gdb/infrun.c b/gdb/infrun.c index e3c1db73749..bc6521c8ec6 100644 --- a/gdb/infrun.c +++ b/gdb/infrun.c @@ -367,7 +367,7 @@ show_stop_on_solib_events (struct ui_file *file, int from_tty, static bool stop_print_frame; /* This is a cached copy of the target/ptid/waitstatus of the last - event returned by target_wait()/deprecated_target_wait_hook(). + event returned by target_wait(). This information is returned by get_last_target_status(). */ static process_stratum_target *target_last_proc_target; static ptid_t target_last_wait_ptid; @@ -3515,7 +3515,6 @@ static ptid_t do_target_wait_1 (inferior *inf, ptid_t ptid, target_waitstatus *status, target_wait_flags options) { - ptid_t event_ptid; struct thread_info *tp; /* We know that we are looking for an event in the target of inferior @@ -3630,12 +3629,7 @@ do_target_wait_1 (inferior *inf, ptid_t ptid, if (!target_can_async_p ()) options &= ~TARGET_WNOHANG; - if (deprecated_target_wait_hook) - event_ptid = deprecated_target_wait_hook (ptid, status, options); - else - event_ptid = target_wait (ptid, status, options); - - return event_ptid; + return target_wait (ptid, status, options); } /* Wrapper for target_wait that first checks whether threads have @@ -4591,10 +4585,7 @@ poll_one_curr_target (struct target_waitstatus *ws) don't get any event. */ target_dcache_invalidate (); - if (deprecated_target_wait_hook) - event_ptid = deprecated_target_wait_hook (minus_one_ptid, ws, TARGET_WNOHANG); - else - event_ptid = target_wait (minus_one_ptid, ws, TARGET_WNOHANG); + event_ptid = target_wait (minus_one_ptid, ws, TARGET_WNOHANG); if (debug_infrun) print_target_wait_results (minus_one_ptid, event_ptid, *ws); diff --git a/gdb/infrun.h b/gdb/infrun.h index 3e84805accb..1209b4188e9 100644 --- a/gdb/infrun.h +++ b/gdb/infrun.h @@ -124,9 +124,8 @@ extern process_stratum_target *user_visible_resume_target (ptid_t resume_ptid); extern int normal_stop (void); /* Return the cached copy of the last target/ptid/waitstatus returned - by target_wait()/deprecated_target_wait_hook(). The data is - actually cached by handle_inferior_event(), which gets called - immediately after target_wait()/deprecated_target_wait_hook(). */ + by target_wait(). The data is actually cached by handle_inferior_event(), + which gets called immediately after target_wait(). */ extern void get_last_target_status (process_stratum_target **target, ptid_t *ptid, struct target_waitstatus *status); diff --git a/gdb/interps.c b/gdb/interps.c index a475d8790c9..b8df3d781e7 100644 --- a/gdb/interps.c +++ b/gdb/interps.c @@ -357,7 +357,6 @@ clear_interpreter_hooks (void) deprecated_readline_hook = 0; deprecated_readline_end_hook = 0; deprecated_context_hook = 0; - deprecated_target_wait_hook = 0; deprecated_call_command_hook = 0; deprecated_error_begin_hook = 0; } diff --git a/gdb/observable.c b/gdb/observable.c index 78f315793b6..afe81394594 100644 --- a/gdb/observable.c +++ b/gdb/observable.c @@ -79,6 +79,8 @@ DEFINE_OBSERVABLE (styling_changed); DEFINE_OBSERVABLE (current_source_symtab_and_line_changed); DEFINE_OBSERVABLE (gdb_exiting); DEFINE_OBSERVABLE (connection_removed); +DEFINE_OBSERVABLE (target_pre_wait); +DEFINE_OBSERVABLE (target_post_wait); } /* namespace observers */ } /* namespace gdb */ diff --git a/gdb/observable.h b/gdb/observable.h index 0cdf4767f04..f426c1a761f 100644 --- a/gdb/observable.h +++ b/gdb/observable.h @@ -256,6 +256,12 @@ extern observable<int> gdb_exiting; /* When a connection is removed. */ extern observable<process_stratum_target */* target */> connection_removed; +/* About to enter target_wait (). */ +extern observable <ptid_t /* ptid */> target_pre_wait; + +/* About to leave target_wait (). */ +extern observable <ptid_t /* event_ptid */> target_post_wait; + } /* namespace observers */ } /* namespace gdb */ diff --git a/gdb/target.c b/gdb/target.c index 658698b4e2b..e3df9275c9a 100644 --- a/gdb/target.c +++ b/gdb/target.c @@ -26,6 +26,7 @@ #include "symtab.h" #include "inferior.h" #include "infrun.h" +#include "observable.h" #include "bfd.h" #include "symfile.h" #include "objfiles.h" @@ -2609,7 +2610,18 @@ target_wait (ptid_t ptid, struct target_waitstatus *status, if (!target_can_async_p (target)) gdb_assert ((options & TARGET_WNOHANG) == 0); - return target->wait (ptid, status, options); + try + { + gdb::observers::target_pre_wait.notify (ptid); + ptid_t event_ptid = target->wait (ptid, status, options); + gdb::observers::target_post_wait.notify (event_ptid); + return event_ptid; + } + catch (...) + { + gdb::observers::target_post_wait.notify (null_ptid); + throw; + } } /* See target.h. */ diff --git a/gdb/top.c b/gdb/top.c index a94ed5cebdb..7831b4f96ca 100644 --- a/gdb/top.c +++ b/gdb/top.c @@ -247,13 +247,6 @@ void (*deprecated_readline_end_hook) (void); void (*deprecated_attach_hook) (void); void (*deprecated_detach_hook) (void); -/* Called when going to wait for the target. Usually allows the GUI - to run while waiting for target events. */ - -ptid_t (*deprecated_target_wait_hook) (ptid_t ptid, - struct target_waitstatus *status, - int options); - /* Used by UI as a wrapper around command execution. May do various things like enabling/disabling buttons, etc... */
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