This makes the assumption that we never pass a stack-allocated char
array to CheckedFormatString arguments (dbgln, outln, warnln). This
assumption seems to hold true for the current state of Serenity code, at
least. :^)
Previously we would treat the empty string as `null`. This caused
JavaScript like this to fail:
```js
var object = {};
try {
object = JSON.parse("");
} catch {}
var array = object.array || [];
```
Since `JSON.parse("")` returned null instead of throwing, it would set
`object` to null and then try and use it instead of using the default
backup value.
Is it another great upgrade to our PNG encoder like in 9aafaec259?
Well, not really - it's not a 2x or 55x improvement like you saw there,
but still it saves something:
- a screenshot of a blank Serenity desktop dropped from about 45 KiB
to 40 KiB.
- re-encoding NASA photo of the Earth to PNG again saves about 25%
(16.5 MiB -> 12.3 MiB), compared to not using filters.
[1]: https://commons.wikimedia.org/wiki/File:The_Blue_Marble_(remastered).jpg
This commit has no behavior changes.
In particular, this does not fix any of the wrong uses of the previous
default parameter (which used to be 'false', meaning "only replace the
first occurence in the string"). It simply replaces the default uses by
String::replace(..., ReplaceMode::FirstOnly), leaving them incorrect.
ByteBuffer::get_bytes_for_writing() was only ensuring capacity before
this patch. The method needs to call resize to register the appended
data, otherwise it will be overwritten with next data addition.
Usually the values of the previous and next pointers of deleted buckets
are never used, as they're not part of the main ordered bucket chain,
but if an in-place rehashing is done, which results in the bucket being
turned into a free bucket, the stale pointers will remain, at which
point any item that is inserted into said free-bucket will have either
a stale previous pointer if the HashTable was empty on insertion, or a
stale next pointer, resulting in undefined behaviour.
This commit also includes a new HashMap test that reproduces this issue
This reverts commit 50c88e5e3a.
The intention was to add them to NonnullRefPtr, not NonnullOwnPtr. That
is also what was advertised in the PR, but not actually done in the
reverted commit.
It was mostly implemented based on a spec note, that described only
allowed characters, but instead of allowing some special characters not
to be escaped, we escaped every special character except those 'new in
this encode set' disallowed characters from the spec definition.
This is an issue on systems that don't have the empty base class
optimisation (such as windows), and we normally don't need to care -
however static_cast is technically the right thing to use, so let's use
that instead.
Co-Authored-By: Daniel Bertalan <dani@danielbertalan.dev>
The compiler would complain about `__builtin_memcpy` in ByteBuffer::copy
writing out of bounds, as it isn't able to deduce the invariant that the
inline buffer is only used when the requested size is smaller than the
inline capacity.
The other change is more bizarre. If the destructor's declaration
exists, gcc complains about a `delete` operation causing an
out-of-bounds array access.
error: array subscript 'DHCPv4Client::__as_base [0]' is partly outside
array bounds of 'unsigned char [8]' [-Werror=array-bounds]
14 | ~DHCPv4Client() = default;
| ^
This looks like a compiler bug, and I'll report it if I find a suitable
reduced reproducer.
This allows direct inlining and hides away some assembly and
bit-fiddling when manipulating the floating point environment.
This only implements the x87/SSE versions, as of now.
This uses the `fistp` and `cvts[sd]2si` respectively, to potentially
round floating point values with just one instruction.
This falls back to `llrint[fl]?` on aarch64 for now.
This new class with an admittedly long OOP-y name provides a circular
queue in shared memory. The queue is a lock-free synchronous queue
implemented with atomics, and its implementation is significantly
simplified by only accounting for one producer (and multiple consumers).
It is intended to be used as a producer-consumer communication
datastructure across processes. The original motivation behind this
class is efficient short-period transfer of audio data in userspace.
This class includes formal proofs of several correctness properties of
the main queue operations `enqueue` and `dequeue`. These proofs are not
100% complete in their existing form as the invariants they depend on
are "handwaved". This seems fine to me right now, as any proof is better
than no proof :^). Anyways, the proofs should build confidence that the
implemented algorithms, which are only roughly based on existing work,
operate correctly in even the worst-case concurrency scenarios.
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