Instead of scanning through the list of seen constants, we now have a
more structured storage of the constants true, false, null, undefined,
and every possible Int32 value.
This fixes an O(n^2) issue found by Kraken/json-stringify-tinderbox.js
This turns expressions like `(2 + 3) * 8 / 2` into a constant (20)
at bytecode compilation time instead of generating instructions
to calculate the value.
This is a new Bytecode::Generator helper that takes an operand and
returns the same operand, or a copy of it, in case a copy is required
to preserve correct evaluation order.
This can be used in a bunch of places where we're worried about
clobbering some value after obtaining it.
Practically, locals are always copied, and temporary registers as well
as constants are returned as-is.
It can be possible for a request to be blocked on another request, so
this patch allows us to send more requests even when a request is
already pending.
To be able to do this, we add a new class called CustodyBase, which can
be resolved on-demand internally in the VirtualFileSystem resolving path
code.
When being resolved, CustodyBase will return a known custody if it was
constructed with such, if that's not the case it will provide the root
custody if the original path is absolute.
Lastly, if that's not the case as well, it will resolve the given dirfd
to provide a Custody object.
Implements `table.get`, `table.set`, `elem.drop`, `table.size`,
and `table.grow`. Also fixes a few issues when generating ref-related
spectests. Also changes the `TableInstance` type to use
`Vector<Reference>` instead of `Vector<Optional<Reference>>`, because
the ability to be null is already encoded in the `Reference` type.
The color indexing transform shouldn't make single-channel images
larger (by needlessly writing a palette). If there <= 16 colors
in the single channel, it should make the image smaller.
The benefit of the color indexing transform is to have only one
varying channel after it (the green channel, which after the
transform serves as index into the color table).
If there is only one varying channel before the transform, it's
not beneficial. (...except if there are <= 16 colors, then the
pixel bundling presumably still works.)
On my Mac system with Homebrew SDL + self-built Clang, SDL2's include
directory is not in the library search path by default. Add it to
unbreak the build.
Functions that don't have a FunctionEnvironment will get their `this`
value from the ExecutionContext. This patch stops generating
ResolveThisBinding instructions at all for functions like that, and
instead pre-populates the `this` register when entering a new bytecode
executable.
We already have a dedicated register slot for `this`, so instead of
having ResolveThisBinding take a `dst` operand, just write the value
directly into the `this` register every time.
This allows searching for text with case-insensitivity. As this is
probably what most users expect, the default behavior is changes to
perform case-insensitive lookups. Chromes may add UI to change the
behavior as they see fit.
