From: Pedro Alves <pedro@palves.net>
To: gdb-patches@sourceware.org
Subject: [PATCH 05/34] Windows gdb: Eliminate reload_context
Date: Wed, 8 May 2024 00:42:04 +0100 [thread overview]
Message-ID: <20240507234233.371123-6-pedro@palves.net> (raw)
In-Reply-To: <20240507234233.371123-1-pedro@palves.net>
We don't need reload_context, because we can get the same information
out of th->context.ContextFlags. If ContextFlags is zero, then we
need to fetch the context out of the inferior thread. This is what
gdbserver does too.
Change-Id: Ied566037c81383414c46c77713bdd1aec6377b23
---
gdb/nat/windows-nat.h | 4 ----
gdb/windows-nat.c | 42 +++++++++++++++++++++++++-----------------
2 files changed, 25 insertions(+), 21 deletions(-)
diff --git a/gdb/nat/windows-nat.h b/gdb/nat/windows-nat.h
index 7d336346a86..41921aa653b 100644
--- a/gdb/nat/windows-nat.h
+++ b/gdb/nat/windows-nat.h
@@ -84,10 +84,6 @@ struct windows_thread_info
the thread. */
bool debug_registers_changed = false;
- /* Nonzero if CONTEXT is invalidated and must be re-read from the
- inferior thread. */
- bool reload_context = false;
-
/* True if this thread is currently stopped at a software
breakpoint. This is used to offset the PC when needed. */
bool stopped_at_software_breakpoint = false;
diff --git a/gdb/windows-nat.c b/gdb/windows-nat.c
index 4ffbeaaf7e4..3888ab6a02c 100644
--- a/gdb/windows-nat.c
+++ b/gdb/windows-nat.c
@@ -98,6 +98,8 @@ struct windows_per_inferior : public windows_process_info
void handle_unload_dll () override;
bool handle_access_violation (const EXCEPTION_RECORD *rec) override;
+ void invalidate_context (windows_thread_info *th);
+
int windows_initialization_done = 0;
std::vector<std::unique_ptr<windows_thread_info>> thread_list;
@@ -523,6 +525,18 @@ windows_per_inferior::find_thread (ptid_t ptid)
return nullptr;
}
+
+void
+windows_per_inferior::invalidate_context (windows_thread_info *th)
+{
+#ifdef __x86_64__
+ if (windows_process.wow64_process)
+ th->wow64_context.ContextFlags = 0;
+ else
+#endif
+ th->context.ContextFlags = 0;
+}
+
windows_thread_info *
windows_per_inferior::thread_rec
(ptid_t ptid, thread_disposition_type disposition)
@@ -536,11 +550,11 @@ windows_per_inferior::thread_rec
case INVALIDATE_CONTEXT:
if (ptid.lwp () != current_event.dwThreadId)
th->suspend ();
- th->reload_context = true;
+ invalidate_context (th);
break;
case DONT_SUSPEND:
- th->reload_context = true;
th->suspended = -1;
+ invalidate_context (th);
break;
}
}
@@ -642,18 +656,13 @@ windows_nat_target::delete_thread (ptid_t ptid, DWORD exit_code,
and supplies its value to the given regcache.
This function assumes that R is non-negative. A failed assertion
- is raised if that is not true.
-
- This function assumes that TH->RELOAD_CONTEXT is not set, meaning
- that the windows_thread_info has an up-to-date context. A failed
- assertion is raised if that assumption is violated. */
+ is raised if that is not true. */
static void
windows_fetch_one_register (struct regcache *regcache,
windows_thread_info *th, int r)
{
gdb_assert (r >= 0);
- gdb_assert (!th->reload_context);
char *context_ptr = (char *) &th->context;
#ifdef __x86_64__
@@ -723,21 +732,23 @@ windows_nat_target::fetch_registers (struct regcache *regcache, int r)
if (th == NULL)
return;
- if (th->reload_context)
- {
#ifdef __x86_64__
- if (windows_process.wow64_process)
+ if (windows_process.wow64_process)
+ {
+ if (th->wow64_context.ContextFlags == 0)
{
th->wow64_context.ContextFlags = CONTEXT_DEBUGGER_DR;
CHECK (Wow64GetThreadContext (th->h, &th->wow64_context));
}
- else
+ }
+ else
#endif
+ {
+ if (th->context.ContextFlags == 0)
{
th->context.ContextFlags = CONTEXT_DEBUGGER_DR;
CHECK (GetThreadContext (th->h, &th->context));
}
- th->reload_context = false;
}
if (r < 0)
@@ -1533,10 +1544,7 @@ windows_nat_target::get_windows_debug_event
*ourstatus = stop->status;
ptid_t ptid (windows_process.current_event.dwProcessId, thread_id);
- windows_thread_info *th
- = windows_process.thread_rec (ptid, INVALIDATE_CONTEXT);
- th->reload_context = true;
-
+ windows_process.thread_rec (ptid, INVALIDATE_CONTEXT);
return ptid;
}
--
2.43.2
next prev parent reply other threads:[~2024-05-07 23:42 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-07 23:41 [PATCH 00/34] Windows non-stop mode Pedro Alves
2024-05-07 23:42 ` [PATCH 01/34] Windows gdb: Dead code in windows_nat_target::do_initial_windows_stuff Pedro Alves
2024-05-08 14:39 ` Tom Tromey
2024-05-07 23:42 ` [PATCH 02/34] Windows gdb: Eliminate global current_process.dr[8] global Pedro Alves
2024-05-08 15:02 ` Tom Tromey
2024-05-07 23:42 ` [PATCH 03/34] Windows gdb+gdbserver: New find_thread, replaces thread_rec(DONT_INVALIDATE_CONTEXT) Pedro Alves
2024-05-08 15:03 ` Tom Tromey
2024-05-07 23:42 ` [PATCH 04/34] Windows gdb: handle_output_debug_string return type Pedro Alves
2024-05-08 14:43 ` Tom Tromey
2024-05-07 23:42 ` Pedro Alves [this message]
2024-05-08 14:45 ` [PATCH 05/34] Windows gdb: Eliminate reload_context Tom Tromey
2024-05-07 23:42 ` [PATCH 06/34] Windows gdb+gdbserver: Eliminate thread_rec(INVALIDATE_CONTEXT) calls Pedro Alves
2024-05-08 15:08 ` Tom Tromey
2024-05-07 23:42 ` [PATCH 07/34] Windows gdb+gdbserver: Eliminate DONT_SUSPEND Pedro Alves
2024-05-08 15:12 ` Tom Tromey
2024-05-07 23:42 ` [PATCH 08/34] Windows gdb+gdbserver: Eliminate windows_process_info::thread_rec Pedro Alves
2024-05-08 15:12 ` Tom Tromey
2024-05-07 23:42 ` [PATCH 09/34] Windows gdb: Simplify windows_nat_target::wait Pedro Alves
2024-05-07 23:42 ` [PATCH 10/34] Windows gdb+gdbserver: Move suspending thread to when returning event Pedro Alves
2024-05-07 23:42 ` [PATCH 11/34] Windows gdb: Introduce continue_last_debug_event_main_thread Pedro Alves
2024-05-08 14:53 ` Tom Tromey
2024-05-07 23:42 ` [PATCH 12/34] Windows gdb: Introduce windows_continue_flags Pedro Alves
2024-05-08 15:16 ` Tom Tromey
2024-05-07 23:42 ` [PATCH 13/34] Windows gdb: Factor code out of windows_nat_target::windows_continue Pedro Alves
2024-05-08 15:18 ` Tom Tromey
2024-05-07 23:42 ` [PATCH 14/34] Windows gdb: Pending stop and current_event Pedro Alves
2024-05-08 15:18 ` Tom Tromey
2024-05-07 23:42 ` [PATCH 15/34] Windows gdb+gdbserver: Elim desired_stop_thread_id / rework pending_stops Pedro Alves
2024-05-07 23:42 ` [PATCH 16/34] Windows gdb+gdbserver: Introduce get_last_debug_event_ptid Pedro Alves
2024-05-07 23:42 ` [PATCH 17/34] Windows gdb: Can't pass signal to thread other than last stopped thread Pedro Alves
2024-05-07 23:42 ` [PATCH 18/34] Windows gdbserver: Fix scheduler-locking Pedro Alves
2024-05-07 23:42 ` [PATCH 19/34] Windows gdb: Enable "set scheduler-locking on" Pedro Alves
2024-05-08 15:25 ` Tom Tromey
2024-05-07 23:42 ` [PATCH 20/34] Windows gdbserver: Eliminate soft-interrupt mechanism Pedro Alves
2024-05-08 15:26 ` Tom Tromey
2024-05-07 23:42 ` [PATCH 21/34] Windows gdb+gdbserver: Make current_event per-thread state Pedro Alves
2024-05-07 23:42 ` [PATCH 22/34] Windows gdb+gdbserver: Make last_sig " Pedro Alves
2024-05-07 23:42 ` [PATCH 23/34] Windows gdb+gdbserver: Make siginfo_er " Pedro Alves
2024-05-07 23:42 ` [PATCH 24/34] Add backpointer from windows_thread_info to windows_process_info Pedro Alves
2024-05-08 15:28 ` Tom Tromey
2024-05-07 23:42 ` [PATCH 25/34] Windows gdb+gdbserver: Share $_siginfo reading code Pedro Alves
2024-05-08 15:29 ` Tom Tromey
2024-05-07 23:42 ` [PATCH 26/34] Windows gdb+gdbserver: Eliminate struct pending_stop Pedro Alves
2024-05-07 23:42 ` [PATCH 27/34] Windows gdb: Change serial_event management Pedro Alves
2024-05-07 23:42 ` [PATCH 28/34] Windows gdb: cygwin_set_dr => windows_set_dr, etc Pedro Alves
2024-05-08 14:46 ` Tom Tromey
2024-05-07 23:42 ` [PATCH 29/34] windows_per_inferior::continue_one_thread, unify WoW64/non-WoW64 paths Pedro Alves
2024-05-07 23:42 ` [PATCH 30/34] windows-nat.c: Avoid writing debug registers if watchpoint hit pending Pedro Alves
2024-05-07 23:42 ` [PATCH 31/34] Windows gdb+gdbserver: Check whether DBG_REPLY_LATER is available Pedro Alves
2024-05-08 12:45 ` Eli Zaretskii
2024-05-08 21:33 ` [PATCH 31/34 v1.2] " Pedro Alves
2024-05-09 10:07 ` Hannes Domani
[not found] ` <86zfsz5kly.fsf@gnu.org>
2024-05-09 11:11 ` Pedro Alves
2024-05-09 11:47 ` [PATCH 31/34 v1.3] " Pedro Alves
2024-05-09 12:28 ` Eli Zaretskii
2024-05-09 14:17 ` Tom Tromey
[not found] ` <86r0eb5g2n.fsf@gnu.org>
2024-05-09 13:27 ` [PATCH 31/34 v1.2] " Pedro Alves
2024-05-07 23:42 ` [PATCH 32/34] Windows gdb: Add non-stop support Pedro Alves
2024-05-07 23:42 ` [PATCH 33/34] Windows gdb: Watchpoints while running (internal vs external stops) Pedro Alves
2024-05-07 23:42 ` [PATCH 34/34] Mention Windows non-stop support in NEWS Pedro Alves
2024-05-08 15:40 ` [PATCH 00/34] Windows non-stop mode Tom Tromey
2024-05-15 17:35 ` Tom Tromey
2024-05-15 20:39 ` Pedro Alves
2024-05-16 15:53 ` Tom Tromey
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