Self deleting an object within a call was leading to crashes due to referencing freed memory, due to a raw pointer stored in the debug lock.
Co-authored-by: RandomShaper <pedrojrulez@gmail.com>
As many open source projects have started doing it, we're removing the
current year from the copyright notice, so that we don't need to bump
it every year.
It seems like only the first year of publication is technically
relevant for copyright notices, and even that seems to be something
that many companies stopped listing altogether (in a version controlled
codebase, the commits are a much better source of date of publication
than a hardcoded copyright statement).
We also now list Godot Engine contributors first as we're collectively
the current maintainers of the project, and we clarify that the
"exclusive" copyright of the co-founders covers the timespan before
opensourcing (their further contributions are included as part of Godot
Engine contributors).
Also fixed "cf." Frenchism - it's meant as "refer to / see".
Backported from #70885.
Sets `AlignOperands` to `DontAlign`.
`clang-format` developers seem to mostly care about space-based indentation and
every other version of clang-format breaks the bad mismatch of tabs and spaces
that it seems to use for operand alignment. So it's better without, so that it
respects our two-tabs `ContinuationIndentWidth`.
Extra:
- Optimized the debug-only check about why the object is null to determine if it's because it has been deleted (the RC is enough; no need to check the ObjectDB).
- Because of the previous point. the debugger being attached is not required anymore for giving the "Object was deleted" error; from now, it only matters that it's a debug build.
- `is_instance_valid()` is now trustworthy. It will return `true` if, and only if, the last object assigned to a `Variant` is still alive (and not if a new object happened to be created at the same memory address of the old one).
- Replacements of `instance_validate()` are used where possible `Variant::is_invalid_object()` is introduced to help with that. (GDScript's `is_instance_valid()` is good.)
- Based on C++11's `atomic`
- Reworked `SafeRefCount` (based on the rewrite by @hpvb)
- Replaced free atomic functions by the new `SafeNumeric<T>`
- Replaced wrong cases of `volatile` by the new `SafeFlag`
- Platform-specific implementations no longer needed
Co-authored-by: Hein-Pieter van Braam-Stewart <hp@tmm.cx>
- Based on C++14's `shared_time_mutex`
- No more need to allocate-deallocate or check for null
- No pointer anymore, just a member variable
- Platform-specific implementations no longer needed
- Simpler for `NO_THREADS`
Happy new year to the wonderful Godot community!
2020 has been a tough year for most of us personally, but a good year for
Godot development nonetheless with a huge amount of work done towards Godot
4.0 and great improvements backported to the long-lived 3.2 branch.
We've had close to 400 contributors to engine code this year, authoring near
7,000 commit! (And that's only for the `master` branch and for the engine code,
there's a lot more when counting docs, demos and other first-party repos.)
Here's to a great year 2021 for all Godot users 🎆
(cherry picked from commit b5334d14f7)
Checks whether the signal exists when issuing an error message when
disconnecting a nonexistent connection. Also prints the callable name.
(cherry picked from commit 6c026a6814)
Note:
Casting to the C++ classes and calling the methods there would work as well,
but would require including he header files for the specific object types handled
here, which wouldn't be OK either.
This commit addresses multiple issues with `Variant`s that point to an `Object`
which is later released, when it's tried to be accessed again.
Formerly, **while running on the debugger the system would check if the instance id was
still valid** to print warnings or return special values. Some cases weren't being
warned about whatsoever.
Also, a newly allocated `Object` could happen to be allocated at the same memory
address of an old one, making cases of use hard to find and having **`Variant`s pointing
to the old one magically reassigned to the new**.
This commit makes the engine realize all these situations **under debugging**
so you can detect and fix them. Running without a debugger attached will still
behave as it always did.
Also the warning messages have been extended and made clearer.
All that said, in the name of performance there's still one possible case of undefined
behavior: in multithreaded scripts there would be a race condition between a thread freeing
an `Object` and another one trying to operate on it. The latter may not realize the
`Object` has been freed soon enough. But that's a case of bad scripting that was never
supported anyway.
We used a lock signals in the signal_map while emitting, because it was
not allowed to disconnect them while being emitted.
We used that lock to check if we where deleting an object during signal
emission.
Now that we allow to disconnect signals while they are being emitted, if
an object first disconnects, then gets deleted we can't know that a
signal was being emitted during the destructor.
This commit adds a new `_emitting` boolean member to Object to be set
while emitting and checked in the destructor, while removing the old
signal lock which is now unused.
According to 22637beb2e (commitcomment-36651823)
and as confirmed by @reduz, this seems not to be necessary now that we
copy-on-write.
This triggered freeze scenarios in cases where a node would be deleted
while being used as a target in a signal emission.
Fixes#34650.
Fixes#34769.
Now those two errors go back to reporting:
```
ERROR: emit_signal: Condition ' !target ' is true. Continuing..:
At: core/object.cpp:1191.
```
It will now give information about the originating object instance
and when locked, the target callback.
This should help debugging editor and game issues that are now being
reported due to adding signal locking in
22637beb2e.
Happy new year to the wonderful Godot community!
We're starting a new decade with a well-established, non-profit, free
and open source game engine, and tons of further improvements in the
pipeline from hundreds of contributors.
Godot will keep getting better, and we're looking forward to all the
games that the community will keep developing and releasing with it.
Condensed some if and ERR statements. Added dots to end of error messages
Couldn't figure out EXPLAINC. These files gave me trouble: core/error_macros.h, core/io/file_access_buffered_fa.h (where is it?),
core/os/memory.cpp,
drivers/png/png_driver_common.cpp,
drivers/xaudio2/audio_driver_xaudio2.cpp (where is it?)
lawnjelly
Angad Kambli
Rémi Verschelde
Micky
Univeous
kobewi
Shatur95
Rémi Verschelde
Pedro J. Estébanez
David Socha
Marcel Admiraal
Maganty Rushyendra
Hugo Locurcio
Wilson E. Alvarez
PouleyKetchoupp
Fabio Alessandrelli
Haoyu Qiu
Juan Linietsky
Bojidar Marinov
qarmin
Braden Bodily