From 68db59b52726d0838b5974ec201becfebed8f27d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=A0=D1=83=D1=81=D0=BB=D0=B0=D0=BD=20=D0=98=D0=B6=D0=B1=D1?=
 =?UTF-8?q?=83=D0=BB=D0=B0=D1=82=D0=BE=D0=B2?= <lrn1986@gmail.com>
Date: Sat, 29 Sep 2012 18:16:16 +0400
Subject: [PATCH] Make gdb JIT-capable (MS-Windows)

Adds the signal-event command (MS-Windows-only) that signals
an event with user-provided ID. Used to resume crashing
process when attached to it via MS-Windows JIT debugging (AeDebug).

PR gdb/14529
---
 gdb/doc/gdb.texinfo | 26 ++++++++++++++++++++++++++
 gdb/windows-nat.c   | 22 ++++++++++++++++++++++
 2 files changed, 49 insertions(+)

diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
index 5fcbada..555563a 100644
--- a/gdb/doc/gdb.texinfo
+++ b/gdb/doc/gdb.texinfo
@@ -18859,6 +18859,33 @@ This is a Cygwin-specific alias of @code{info shared}.
 This command loads symbols from a dll similarly to
 add-sym command but without the need to specify a base address.
 
+@kindex signal-event
+@item signal-event @var{id}
+This command signals an event with user-provided @var{id}.  Used to resume
+crashing process when attached to it using MS-Windows JIT debugging (AeDebug).
+
+To use it, create or edit the following keys in
+@code{HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AeDebug} and/or
+@code{HKLM\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\AeDebug}
+(for x86_64 versions):
+
+@itemize @minus
+@item
+@code{Debugger} (REG_SZ) --- a command to launch the debugger.  Suggested
+command is: @code{@var{fully-qualified-path-to-gdb.exe} -ex "attach %ld"
+-ex "signal-event %ld" -ex "continue"}
+
+First @code{%ld} will be replaced by process ID, second @code{%ld} will be
+replaced by ID of the event that blocks the crashing process, waiting for
+debugger to attach.
+
+@item
+@code{Auto} (REG_SZ) --- either @code{1} or @code{0}. @code{1} will make the
+system run debugger specified by Debugger key automatically, @code{0} will
+cause a dialog box with ``OK'' and ``Cancel'' buttons to appear, which allows
+the user to either terminate crashing process (OK) or debug it (Cancel).
+@end itemize
+
 @kindex set cygwin-exceptions
 @cindex debugging the Cygwin DLL
 @cindex Cygwin DLL, debugging
diff --git a/gdb/windows-nat.c b/gdb/windows-nat.c
index 905d4bf..f003ece 100644
--- a/gdb/windows-nat.c
+++ b/gdb/windows-nat.c
@@ -933,6 +933,25 @@ dll_symbol_command (char *args, int from_tty)
   safe_symbol_file_add (args, from_tty, NULL, 0, OBJF_SHARED | OBJF_USERLOADED);
 }
 
+static void
+signal_event_command (char *args, int from_tty)
+{
+  uintptr_t event_id = 0;
+  char *endargs = NULL;
+
+  if (args == NULL)
+    error (_("signal-event requires an argument (integer event id)"));
+
+  event_id = strtoumax (args, &endargs, 10);
+
+  if ((errno == ERANGE) || (event_id == 0) || (event_id > UINTPTR_MAX) ||
+      ((HANDLE) event_id == INVALID_HANDLE_VALUE))
+    error (_("Failed to convert `%s' to event id"), args);
+
+  SetEvent ((HANDLE) event_id);
+  CloseHandle ((HANDLE) event_id);
+}
+
 /* Handle DEBUG_STRING output from child process.
    Cygwin prepends its messages with a "cygwin:".  Interpret this as
    a Cygwin signal.  Otherwise just print the string as a warning.  */
@@ -2547,6 +2566,9 @@ _initialize_windows_nat (void)
   cygwin_internal (CW_SET_DOS_FILE_WARNING, 0);
 #endif
 
+  c = add_com ("signal-event", class_run, signal_event_command,
+	       _("Signal an object with ID."));
+
   c = add_com ("dll-symbols", class_files, dll_symbol_command,
 	       _("Load dll library symbols from FILE."));
   set_cmd_completer (c, filename_completer);
-- 
1.7.11