The flag indicating the presence of an await expression should be
passed up to the parent scope until the nearest function scope is
reached. This resolves several problems related to identifying
top-level awaits, which are currently not recognized correctly
when used within a nested scope.
This makes the behavior of `Symbol` correct in strict mode, wherein if
the receiver is a symbol primitive, assigning new properties should
throw a TypeError.
ECMA-262 implies that `MIN_VALUE` should be a denormalized value if
denormal arithmetic is supported. This is the case on x86-64 and AArch64
using standard GCC/Clang compilation settings.
test262 checks whether `Number.MIN_VALUE / 2.0` is equal to 0, which
only holds if `MIN_VALUE` is the smallest denormalized value.
This commit renames the existing `NumericLimits<FloatingPoint>::min()`
to `min_normal()` and adds a `min_denormal()` method to force users to
explicitly think about which one is appropriate for their use case. We
shouldn't follow the STL's confusingly designed interface in this
regard.
This avoids the overhead of allocating a new Array on every function
call, saving a substantial amount of time and avoiding GC thrash.
This patch only makes use of Op::Call in CallExpression. There are other
places we should codegen this op. We should also do the same for super
expression calls.
~5% speed-up on Kraken/stanford-crypto-ccm.js
Forcing every function call to allocate a new Array just to accommodate
spread parameters is not very nice, so let's start moving towards making
this a special case rather than the general (and only) case.
The var environments will unwind as needed with the ExecutionContext
and there's no need to include it in the unwind info.
We still need to do this for lexical environments though, since they
can have short local lifetimes inside a function.
Since the relationship between VM and Bytecode::Interpreter is now
clear, we can have VM ask the Interpreter for roots in the GC marking
pass. This avoids having to register and unregister handles and
MarkedVectors over and over.
Since GeneratorObject can also own a RegisterWindow, we share the code
in a RegisterWindow::visit_edges() helper.
~4% speed-up on Kraken/stanford-crypto-ccm.js :^)
While the completion value of a variable declaration is specified to be
empty, we might already have a completion value in the accumulator from
a previous statement. Preserve it so as to avoid clobbering it.
This fixes 6 tests on test262.
This is a similar strategy to what v8 does. Use the ASAN API function
__asan_addr_is_in_fake_stack to check any fake stack frames associated
with each stack address we scan. This fully allows running test-js -g
with the option detect_stack_use_after_return turned on.
The valid range for temporal values (`nsMinInstant`/`nsMaxInstant`)
means performing nanosecond-valued integers could lead to an overflow.
NB: Only the `roundingMode: "day"` case was affected, as all others were
already performing the division on floating-point `fractional_second`
values. I'm adding `.0` suffixes everywhere to make this fact clearer.
This adds a few local tests as well, as those are tested with sanitizers
enabled by default, unlike test262.
This makes them trivially copyable, which is an assumption multiple
optimizations use when rebuilding the instruction stream.
This fixes most optimized crashes in the test262 suite.
See 874ecf9
After this refactoring, we now correctly handle non-function /
non-undefined objects being passed multiple times: instead of skipping
assignment to promiseCapability altogether and failing with a
NotAFunction error in the end; on the second time the executor closure
is called, we return GetCapabilitiesExecutorCalledMultipleTimes.
This fixes the 7 `capability-executor-called-twice.js` test262 tests.
We do this by moving the `LoadImmediate undefined` instruction to a
separate basic block which jumps to the case's block unconditionally.
We enter a case initially using this wrapper, but when falling through,
we directly jump to the next case's block.
This adds support for exporting class expressions, which was previously
TODO'd.
We now correctly set the binding name of exports to `"*default*"` if
they are unnamed. I'm not sure what the difference between the
`InitializationMode` kinds is, but using `Initialize` fixes a bunch of
tests.
Note that some export tests (e.g. `eval-export-dflt-expr-cls-named.js`)
still fail, as we don't set the "name" property of exported classes
correctly.
176 new passes on test262
While this would be useful in the future for implementing a multi-tiered
optimization strategy, currently a binary on/off is enough for us. This
removes the confusingly on-by-default `OptimizationLevel::None` option
which made the optimization pipeline a no-op even if
`Bytecode::Interpreter::set_optimizations_enabled` had been called.
Fixes#15982
If an exception is thrown by FunctionDeclarationInstantiation for an
async or async-generator function, we still need to return a promise.
We can't just throw the exception.
81 new passes on test262. :^)
The exponent might be larger than the range of values representable by
an i32, so we have to use the `fmod` function instead of the modulo
operator.
This fixes 3 test262 tests on AArch64. No changes on x86-64.
