Emit and handle (custom) `-register-changed` notification
This commit adds new (custom) asynchronous notification about register value
being changed. Standard GDB does not notify MI clients about register value
being changed when debugging (for example, by CLI command `set $rax = 1` or
via Python's `Value.assign()`).
This caused libgdb's register value cache being out of sync. In the past,
this was partially worked around by manually emiting the notification on
`GDBRegisterWithValue` APIs, but this did not (and could not) handle the case
register was changed from GDB command line.
To solve this problem, this commit installs a custom Python event handler
that emits new GDB/MI notification - `-register-changed` - whenever a register
changes after debugee is stopped. This has been enabled by upstream GDB commit
4825fd "gdb/python: implement support for sending custom MI async notifications"
On libgdbs side, complete inferior state is invalidated. In theory, one could
carefully invalidate only the changed `GDBRegisterWithValue` but in certain cases
this could also change the backtrace (for example, if one updates stack pointer)
or position in code. So it seems safer to just invalidate everything.
"
jv:libgdbs - GNU Debugger Interface Library
Copyright (C) 2015-now Jan Vrany
Copyright (C) 2022-2023 LabWare
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the 'Software'), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
"
"{ Package: 'jv:libgdbs' }"
"{ NameSpace: Smalltalk }"
SharedPool subclass:#GDBFeatures
instanceVariableNames:''
classVariableNames:'DebuggerFeatureFrozenVarObjs DebuggerFeaturePendingBreakpoint
DebuggerFeaturePython DebuggerFeatureThreadInfo
DebuggerFeatureDataReadMemoryBytes
DebuggerFeatureBreakpointNotifications DebuggerFeatureAdaTaskInfo
DebuggerFeatureLanguageOption DebuggerFeatureInfoGDBMICommand
DebuggerFeatureUndefinedCommandErrorCode
DebuggerFeatureExecRunStartOption TargetFeatureAsync
TargetFeatureReverse'
poolDictionaries:''
category:'GDB'
!
!GDBFeatures class methodsFor:'documentation'!
copyright
"
jv:libgdbs - GNU Debugger Interface Library
Copyright (C) 2015-now Jan Vrany
Copyright (C) 2022-2023 LabWare
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the 'Software'), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
"
!
documentation
"
A set of GDB features. Use this in `#ensureFeature:` and `#hasFeature:`
[author:]
Jan Vrany <jan.vrany@fit.cvut.cz>
[instance variables:]
[class variables:]
[see also:]
https://sourceware.org/gdb/onlinedocs/gdb/GDB_002fMI-Support-Commands.html, -list-features
"
! !
!GDBFeatures class methodsFor:'initialization'!
initialize
"Invoked at system start or when the class is dynamically loaded."
DebuggerFeatureFrozenVarObjs := 'frozen-varobjs'.
DebuggerFeaturePendingBreakpoint := 'pending-breakpoints' .
DebuggerFeaturePython := 'python'.
DebuggerFeatureThreadInfo := 'thread-info' .
DebuggerFeatureDataReadMemoryBytes := 'data-read-memory-bytes' .
DebuggerFeatureBreakpointNotifications := 'breakpoint-notifications' .
DebuggerFeatureAdaTaskInfo := 'ada-task-info' .
DebuggerFeatureLanguageOption := 'language-option' .
DebuggerFeatureInfoGDBMICommand := 'info-gdb-mi-command' .
DebuggerFeatureUndefinedCommandErrorCode := 'undefined-command-error-code' .
DebuggerFeatureExecRunStartOption := 'exec-run-start-option' .
TargetFeatureAsync := 'async'.
TargetFeatureReverse := 'reverse'.
"Modified: / 07-02-2018 / 12:51:43 / Jan Vrany <jan.vrany@fit.cvut.cz>"
! !
!GDBFeatures class methodsFor:'documentation'!
version_HG
^ '$Changeset: <not expanded> $'
! !
GDBFeatures initialize!