The basic idea is that a global object cannot just come out of nowhere,
it must be associated to a realm - so get it from there, if needed.
This is to enforce the changes from all the previous commits by not
handing out global objects unless you actually have an initialized
realm (either stored somewhere, or the VM's current realm).
This is a continuation of the previous five commits.
A first big step into the direction of no longer having to pass a realm
(or currently, a global object) trough layers upon layers of AOs!
Unlike the create() APIs we can safely assume that this is only ever
called when a running execution context and therefore current realm
exists. If not, you can always manually allocate the Error and put it in
a Completion :^)
In the spec, throw exceptions implicitly use the current realm's
intrinsics as well: https://tc39.es/ecma262/#sec-throw-an-exception
Each of these strings would previously rely on StringView's char const*
constructor overload, which would call __builtin_strlen on the string.
Since we now have operator ""sv, we can replace these with much simpler
versions. This opens the door to being able to remove
StringView(char const*).
No functional changes.
Putting everything in the global scope will lead to mayhem and failing
tests with an actually correct implementation of scoping :^)
Also adds in a tiny debug log of the exception, otherwise we'd be
staring at failing tests with no info on what failed.
Instead of crashing on the spot, return a descriptive error that will
eventually continue its days as a javascript "InternalError" exception.
This should make random crashes with BC less likely.
This commit removes all exception related code:
Remove VM::exception(), VM::throw_exception() etc. Any leftover
throw_exception calls are moved to throw_completion.
The one method left is clear_exception() which is now a no-op. Most of
these calls are just to clear whatever exception might have been thrown
when handling a Completion. So to have a cleaner commit this will be
removed in a next commit.
It also removes the actual Exception and TemporaryClearException classes
since these are no longer used.
In any spot where the exception was actually used an attempt was made to
preserve that behavior. However since it is no longer tracked by the VM
we cannot access exceptions which were thrown in previous calls.
There are two such cases which might have different behavior:
- In Web::DOM::Document::interpreter() the on_call_stack_emptied hook
used to print any uncaught exception but this is now no longer
possible as the VM does not store uncaught exceptions.
- In js the code used to be interruptable by throwing an exception on
the VM. This is no longer possible but was already somewhat fragile
before as you could happen to throw an exception just before a VERIFY.
Using an Optional was extremely wasteful for function objects that don't
even have a bytecode executable.
This allows ECMAScriptFunctionObject to fit in a smaller size class.
These tests are not meant as a replacement to test-js with the -b option
but are meant to test simple cases until that works.
Before this it was very easy to accidentally break bytecode since no
tests were run in bytecode mode. This hopefully makes it easier to spot
such regressions :^).
These were missed in 565a880ce5.
This wasn't an issue because these tests don't pledge/unveil anything,
so they could happily dlopen() the library at runtime. But this is now
needed in order to migrate LibUnicode towards weak symbols instead.
The spec has a note stating that resolve binding will always return a
reference whose [[ReferencedName]] field is name. However this is not
correct as the underlying method GetIdentifierReference may throw on
env.HasBinding(name) thus it can throw. However, there are some
scenarios where it cannot throw because the reference is known to exist
in that case we use MUST with a comment.
Previously we might swallow invalid unicode point which would skip valid
ascii characters. This could be dangerous as we might skip a '"' thus
not closing a string where we should.
This might have been exploitable as it would not have been clear what
code gets executed when looking at a script.
Another approach to this would be simply replacing all invalid
characters with the replacement character (this is what v8 does). But
our lexer and parser are currently not set up for such a change.
This should fix the flaky tests of test-js.
It also fixes the tests when running with the -g flag since the values
will not be garbage collected too soon.
Split out the functionality to gather multiple tests from the filesystem
and run them in turn into Test::TestRunner, and leave the JavaScript
specific test harness logic in Test::JS::TestRunner and friends.
The TestRunner objects at the end of test-js are destroyed after the
if/else that chooses whether to run the 262 parser tests or the standard
tests. Accessing TestRunner::the() after the lifetime of the TestRunners
ends is UB, so return the Test::Counts from run() instead. Also, fix the
destructor of TestRunner to set s_the to nullptr so that if anyone tries
this type of shenanigains again, they'll get a crash :^).
