Lowers these extension methods to some helper functions instead of
allowInterop to improve performance and get consistent semantics.
Specifically:
- Function.toJS no longer gives you the same JSFunction when calling
toJS on the same function multiple times in the JS compilers.
- Adds fast calling syntax for functions with 0-5 args in the JS
compilers.
- Allows additional args to be passed to converted functions that
are omitted in the JS compilers.
- The static type now determines the number of args that can be
passed to the JS function in the JS compilers.
- Fixes an issue in dart2wasm where if too few arguments are
passed, the call may succeed due to conversion of undefined to
null.
- Adds throws when a user tries to wrap a JS function that
returned from Function.toJS in the JS compilers.
Closes https://github.com/dart-lang/sdk/issues/55515
Addresses https://github.com/dart-lang/sdk/issues/48186
CoreLibraryReviewExempt: Changes to docs only in API surface.
Change-Id: I41d864dc5e02b597d9f1c16c88e3c04872f28225
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/368065
Reviewed-by: Nicholas Shahan <nshahan@google.com>
Reviewed-by: Stephen Adams <sra@google.com>
Commit-Queue: Srujan Gaddam <srujzs@google.com>
Reviewed-by: Martin Kustermann <kustermann@google.com>
Closes https://github.com/dart-lang/sdk/issues/55342
Closes https://github.com/dart-lang/sdk/issues/55536
Closes https://github.com/dart-lang/sdk/issues/56015
- Adds a type parameter T that extends Object? to
ExternalDartReference to capture the type of the value
that was externalized.
-- In the JS compilers, the representation type of
ExternalDartReference is now T.
-- In dart2wasm, the representation type is now JSValue?.
- ExternalDartReference no longer implements Object.
- Return type of toDartObject is now T.
- ObjectToExternalDartReference and
ExternalDartReferenceToObject both now are on a T that is
bound to Object?.
- Internal patches for WeakReference and Finalizer are
updated.
Change-Id: Ic2dc834b17ec6a4eb2122cba3c495a6e0a1eae6e
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/370663
Commit-Queue: Srujan Gaddam <srujzs@google.com>
Reviewed-by: Martin Kustermann <kustermann@google.com>
Reviewed-by: Sigmund Cherem <sigmund@google.com>
Reviewed-by: Lasse Nielsen <lrn@google.com>
Since these operators can't be written by users, prefer
to keep them as JS types.
Closes https://github.com/dart-lang/sdk/issues/55267
Change-Id: Ifb9b581fb82e057ba14c669a5a3934f9c502d06f
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/359181
Reviewed-by: Sigmund Cherem <sigmund@google.com>
Reviewed-by: Martin Kustermann <kustermann@google.com>
Reviewed-by: Lasse Nielsen <lrn@google.com>
Commit-Queue: Srujan Gaddam <srujzs@google.com>
This CL adds `isWildcard` to `StructuralVariableBuilder` and allows type variables in functions and function types. It also removes them from scope so they can't be used.
Bug: https://github.com/dart-lang/sdk/issues/55655
Change-Id: I26237375480318dd0c9a01cb59b3426b783ca7be
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/372240
Reviewed-by: Johnni Winther <johnniwinther@google.com>
Commit-Queue: Kallen Tu <kallentu@google.com>
Reviewed-by: Chloe Stefantsova <cstefantsova@google.com>
* Fix `ToWinAPIFilePath` handling of UNC paths. This function did
not handle UNC paths correctly: it was prefixing them with
`\\?\` instead of `\\?\UNC\`;
* Fix issue in `File::Copy` forcing the wrong path to long form:
temporary files are created next to the destination, so it
is destination (`new_path`) that should be forced into long form and
not the source;
* Fix issue in `GetDirectoryPath` not preserving the path separator.
The newly added test should cover all these corner cases to prevent
future regressions.
TEST=standalone/io/regress_56049
Fixes https://github.com/dart-lang/sdk/issues/56049
Fixed: 56049
Change-Id: I4970efd0674989b8cc291778cf87806b0ea318ff
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/372400
Reviewed-by: Alexander Aprelev <aam@google.com>
Commit-Queue: Slava Egorov <vegorov@google.com>
See the comments before tests for details.
The test cases are generated with this Rust program:
```
use num::*;
fn main() {
// 10111...., 65 bits
let lo: u64 = (1 << 63) - 1;
let mut err_pattern: BigUint = BigUint::from(lo);
err_pattern.set_bit(64, true);
// In the error case, the bit after the sign bit should be set (this bit will be lost), and
// sign bit should be unset (so that overflow won't make the result negative).
assert!(err_pattern.bit(64));
assert!(!err_pattern.bit(63));
// For each radix, find the number and digit where
// `<error> = (<old number> * <radix>) + <digit>`.
'radix_loop: for radix in 4..=36u32 {
for digit in 0..radix {
let i: BigUint = (err_pattern.clone() - BigUint::from(digit)) / BigUint::from(radix);
if !i.bit(64) && !i.bit(63) {
println!(
"{}: {} + {} ({} + {})",
radix,
i.to_str_radix(radix),
BigUint::from(digit).to_str_radix(radix),
i,
digit,
);
continue 'radix_loop;
}
}
}
}
```
Change-Id: I6fe92c46b31373f465702744ee069394db949b60
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/372422
Commit-Queue: Ömer Ağacan <omersa@google.com>
Reviewed-by: Lasse Nielsen <lrn@google.com>
This test file tested the old `onError` parameter of `int.parse` and was
removed in b3304af17d.
Also remove strange code from pre-null-safe days.
Change-Id: I224b4c4002c14050b67c29c7327e31b422b18ebb
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/372420
Reviewed-by: Lasse Nielsen <lrn@google.com>
Commit-Queue: Ömer Ağacan <omersa@google.com>
This CL fixes symlink resolution by properly decoding a URI to a file
path before doing symlink resolution (on the file path).
File paths have spaces, but URIs can be encoded with percent encoding.
Before resolving the relative paths, the symlink-resolved script path
is encoded as URI again. This encoding is trivial (percentage
encoding is optional), so it only needs to prepend a scheme.
Also, this CL improves the error message for the relative path
resolution if the dylib cannot be found to include the script uri.
TEST=tests/ffi/native_assets/asset_relative_test.dart
Closes: https://github.com/dart-lang/sdk/issues/56053
Change-Id: I3ac9748e971e6eacbe14f3485bf3a3943d587d7d
Cq-Include-Trybots: dart/try:vm-aot-asan-linux-release-x64-try,vm-aot-linux-debug-x64-try,vm-aot-linux-debug-x64c-try,vm-aot-mac-release-arm64-try,vm-aot-mac-release-x64-try,vm-aot-msan-linux-release-x64-try,vm-aot-obfuscate-linux-release-x64-try,vm-aot-optimization-level-linux-release-x64-try,vm-aot-tsan-linux-release-x64-try,vm-aot-ubsan-linux-release-x64-try,vm-aot-win-debug-arm64-try,vm-aot-win-debug-x64-try,vm-aot-win-debug-x64c-try,vm-asan-linux-release-arm64-try,vm-msan-linux-release-arm64-try,vm-tsan-linux-release-arm64-try,vm-ubsan-linux-release-arm64-try
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/372421
Reviewed-by: Martin Kustermann <kustermann@google.com>
Commit-Queue: Daco Harkes <dacoharkes@google.com>
The https://dart-review.googlesource.com/c/sdk/+/371100
should have included this change, but I somehow managed
to not include it in the upload.
CoreLibraryReviewExempt: Would have been part of accepted CL
Change-Id: Ia9d133ef753413d4804d04db2478e73709e5e5ca
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/372440
Reviewed-by: Martin Kustermann <kustermann@google.com>
Commit-Queue: Lasse Nielsen <lrn@google.com>
Adds an interface which implements both `TypedData`
and `List`. That allows abstracting over types that are both
`List` and `TypedData` without losing access to one of the
interfaces.
Tested: typed_data_interface_test.dart
Change-Id: Idbdfc084ea5d2d9a072887973e2e9d29a5fd94ce
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/371100
Reviewed-by: Martin Kustermann <kustermann@google.com>
Commit-Queue: Lasse Nielsen <lrn@google.com>
Reviewed-by: Nate Bosch <nbosch@google.com>
Reviewed-by: Stephen Adams <sra@google.com>
Wildcard optional parameters aren't used anyways, so it doesn't matter if they have a default value.
This CL removes the error that's typically there.
Bug: https://github.com/dart-lang/sdk/issues/55655
Change-Id: Ie7286e1c3650fa347b1c28f1cc4ebd657cca33de
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/371560
Commit-Queue: Kallen Tu <kallentu@google.com>
Reviewed-by: Johnni Winther <johnniwinther@google.com>
Like type parameters, these parameters can't be passed from JS and
such functions already do not work as intended as there is no way
to pass named args to a JS function. These named parameters were
being silently ignored in dart2wasm when creating the function
trampoline.
Change-Id: Iebb890de05f8b242e0542c1ec8f2c0582c5232df
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/368062
Reviewed-by: Johnni Winther <johnniwinther@google.com>
Reviewed-by: Nicholas Shahan <nshahan@google.com>
This wasn't caught by default CI builders, because
default configurations use `pkg/dart2wasm/tool/compile_benchmark`
which passes all unknown flags to the compiler (for convenience
of local development) but `dart compile wasm` doesn't
Change-Id: I6a92d3f04848e027c92b1feee3d54e7efba9fd27
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/371661
Commit-Queue: Martin Kustermann <kustermann@google.com>
Reviewed-by: Ömer Ağacan <omersa@google.com>
Adds a flag users can use via
dart compile wasm \
--extra-compiler-option=--enable-experimental-wasm-interop
which allows code to import `dart:_wasm` and use import/export
pragmas.
Similar to how we have a way to import `dart:ffi`
dart compile wasm \
--extra-compiler-option=--enable-experimental-ffi
TEST=web/wasm/allow_import_export_pragmas_test (positive test)
TEST=web/wasm/reject_import_export_pragmas_test (negative test)
Change-Id: Ibdbbac6c3aa049b2759e96b7b749dd30ecc6aaed
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/370063
Reviewed-by: Martin Kustermann <kustermann@google.com>
Reviewed-by: Jackson Gardner <jacksongardner@google.com>
Reviewed-by: Ömer Ağacan <omersa@google.com>
Commit-Queue: Martin Kustermann <kustermann@google.com>
* Unqualified, out-of-scope static extension members are not
accessible.
* Locally scoped extension members shadow others.
* Static and instance extension members do not conflict.
Fixes https://github.com/dart-lang/sdk/issues/41268
Fixes https://github.com/dart-lang/sdk/issues/55848
Cq-Include-Trybots: luci.dart.try:flutter-analyze-try,analyzer-win-release-try,pkg-win-release-try
Change-Id: Icd618d044b3857efa24f365c6835d42c0022c176
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/370323
Reviewed-by: Paul Berry <paulberry@google.com>
Commit-Queue: Sam Rawlins <srawlins@google.com>
Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
In most cases, the (now removed) SDK class was patched so that the constructor redirected to a platform-specific implementation of the unmodifiable view. Uses of the SDK class in the platform code could be rewritten to the more direct use of the implementation class.
The big +/- file changes are from moving the implementation classes from the patch file (typed_data_patch.dart), where they are no longer needed, to the internal file (typed_data.dart).
TEST=ci
Bug: #53785
Change-Id: Iaa7370de25b7fc2d26b24f7733c2892868e593cb
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/370661
Reviewed-by: Ömer Ağacan <omersa@google.com>
Reviewed-by: Lasse Nielsen <lrn@google.com>
Reviewed-by: Siva Annamalai <asiva@google.com>
Commit-Queue: Stephen Adams <sra@google.com>
Reviewed-by: Brian Quinlan <bquinlan@google.com>
This CL adds a new --interop-null-assertions flag (cf.
--native-null-assertions) with the goal of validating that JS interop
APIs with non-nullable static return types do not return null values.
This flag is currently disabled by default but is intended to assist in
sound null safety migrations.
In general, we don't guarantee type soundness of package:js interop
since users can write incorrect static types which are not backed by
any runtime checks. However, it is likely that during the null safety
migration, some interop APIs which should have been made nullable
weren't. Therefore, we want to offer some additional (but limited)
checking for this case.
For static invocations of functions with non-nullable return types, we
can simply perform a null check on the result of the call.
For instance methods (which could be invoked virtually/dynamically), we
want to perform a null check on the return value in the callee (the
interceptor method) itself when possible.
It's possible for multiple interop bindings to share the same
interceptor method. We produce a null check in the interceptor method
body if all the methods have non-nullable return types. Otherwise, we
insert checks at callsites when appropriate.
Change-Id: Ifd155d7f8326152b6d57d61199e0b7973c4a1211
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/369784
Reviewed-by: Sigmund Cherem <sigmund@google.com>
Commit-Queue: Mayank Patke <fishythefish@google.com>
This CL moves native assets resolution to the embedder.
The Dart VM looks up the asset path (for example
`['relative', 'foo.so']`) with the asset id. The embedder defines
callbacks for asset loading, and returns a handle to the dylib.
Then the VM calls the embedder again with `dlsym` to lookup the symbol.
The Dart VM & kernel compiler are responsible for the asset id to
asset path mapping. The kernel compiler compiles it into the snapshot
and the VM looks it up in the snapshot.
Relative paths are resolved relative to the isolate script uri (kernel
snapshot, jit snapshot, aot snapshot, or `dart compile exe` result).
The embedder is responsible for remembering the script uri it set when
spawning the isolate group.
This CL does not add `dlclose` or `dladdr` embedder callbacks yet.
Bug: https://github.com/dart-lang/sdk/issues/55521
Bug: https://github.com/dart-lang/sdk/issues/55966
TEST=pkg/dartdev/test/native_assets/build_test.dart
TEST=tests/ffi/native_assets/asset_relative_test.dart
Bug: https://github.com/dart-lang/sdk/issues/55410
Bug: https://github.com/dart-lang/sdk/issues/55523
Bug: https://github.com/dart-lang/sdk/issues/55207
Change-Id: I75ec4a368c5fb3d2f76b03771e796ff56bcac941
Cq-Include-Trybots: dart/try:vm-aot-linux-debug-x64-try,vm-aot-linux-debug-x64c-try,vm-aot-mac-release-arm64-try,vm-aot-mac-release-x64-try,vm-aot-obfuscate-linux-release-x64-try,vm-aot-optimization-level-linux-release-x64-try,vm-aot-win-debug-arm64-try,vm-aot-win-debug-x64-try,vm-aot-win-debug-x64c-try,pkg-linux-debug-try,pkg-linux-release-arm64-try,pkg-mac-release-try,pkg-mac-release-arm64-try,pkg-win-release-try,pkg-win-release-arm64-try,vm-aot-asan-linux-release-x64-try,vm-asan-linux-release-x64-try,vm-aot-msan-linux-release-x64-try,vm-msan-linux-release-x64-try
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/361881
Reviewed-by: Martin Kustermann <kustermann@google.com>
Commit-Queue: Daco Harkes <dacoharkes@google.com>
Make tool (by default) give error when test entry specified in status
file does not exist. Make -w (by default) remove such entries.
Cleanup most status files, fixing a few entries containing `.dart` and
removing obsolete entries (i.e. entries pointing to nonexisting tests).
This should for instance have given an error in
https://dart-review.googlesource.com/c/sdk/+/370600 saying that the file
I specified didn't exist (in that I shouldn't have specified the `.dart`
part).
TEST=No tests, this is status file maintenance.
Change-Id: Ie977bf15dea2e3dad8d771fd3e99917317e975f6
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/370886
Commit-Queue: Jens Johansen <jensj@google.com>
Reviewed-by: Alexander Thomas <athom@google.com>
This is a reland of commit 35bc17a0fa
Changes from the original CL is that we now allow packages in
`allowedInteropLibrariesInDart2WasmPackages`.
Original change's description:
> [dart2wasm] Check import/export pragmas in user code
>
> Change-Id: I926d108a4571d685c67d3a174a8e506910cce8f7
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/369020
> Commit-Queue: Ömer Ağacan <omersa@google.com>
> Reviewed-by: Martin Kustermann <kustermann@google.com>
Change-Id: I69f61ecf246dfdbfcab372c6c2adb2a64f2d0b36
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/370900
Reviewed-by: Martin Kustermann <kustermann@google.com>
Commit-Queue: Ömer Ağacan <omersa@google.com>
This is a follow-up to [0]. That CL changed dart2wasm's modular
transformer to issue an error if `dart:ffi` is imported.
Users of packages that have specialized code for the VM (which supports
FFI) use conditional imports based on `dart.library.ffi`. We don't want
the VM-specific code to be used for web in dart2wasm (as dart2wasm
doesn't support the entirety of `dart:ffi`).
As a result we're going to make `dart.library.ffi` be false in
coditional imports (as well as in
`const bool.fromEnvironment('dart.library.ffi')`).
[0] https://dart-review.googlesource.com/c/sdk/+/368568
Issue https://github.com/dart-lang/sdk/issues/55948
Issue https://github.com/flutter/flutter/issues/149984
Change-Id: I70a775278ab701d1fd2596521e378cb6364edac2
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/370580
Commit-Queue: Martin Kustermann <kustermann@google.com>
Reviewed-by: Srujan Gaddam <srujzs@google.com>
Followup to fb057ea4e0
Now that the web implementation of DateTime supports microseconds, the test special cases for not supporting microseconds can be removed.
Change-Id: I10991b25e42d643ae58850d7190621c9d11877b8
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/367680
Reviewed-by: Lasse Nielsen <lrn@google.com>
Commit-Queue: Stephen Adams <sra@google.com>
Previously, if a record literal had named fields, type inference of
the literal fields would happen as part of the process of
hoisting. This was a problem because the hoisting process requires
visiting the fields in reverse order, so as a result, the order in
which subexpressions were type inferred was the reverse of the order
in which they would be executed, leading to unsound type promotion
behavior.
Fixes#55914.
Bug: https://github.com/dart-lang/sdk/issues/55914
Change-Id: I2d8930e0e1d7579d065bfb850aa7472d28a8012c
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/369761
Reviewed-by: Chloe Stefantsova <cstefantsova@google.com>
Commit-Queue: Paul Berry <paulberry@google.com>
No client of the VM uses this flag, only tests, and this flag was always
set to false in AOT mode. Thus, remove uses of this flag and instead
always lazily create dispatchers as needed when resolving method names
in JIT mode.
Remove the implicit value of `allow_add` for some Resolver
static methods. For callers that previously depended on the implicit
`true` value (which includes the AOT precompilier), pass `true` for
uses in the compiler and pass `!FLAG_precompiled_mode` for uses in the
runtime. Assert that `allow_add` is false when these methods are invoked
from the precompiled runtime.
Remove Resolver static methods that are no longer used.
TEST=ci
Change-Id: Ib6a7354f7a859e86743c381513a4129c14895753
Cq-Include-Trybots: luci.dart.try:vm-linux-debug-x64-try,vm-linux-release-x64-try,vm-aot-linux-debug-x64-try,vm-aot-linux-release-x64-try,vm-aot-mac-release-arm64-try,vm-mac-debug-arm64-try,vm-mac-release-arm64-try
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/366668
Reviewed-by: Ryan Macnak <rmacnak@google.com>
Reviewed-by: Martin Kustermann <kustermann@google.com>
Commit-Queue: Tess Strickland <sstrickl@google.com>
If HttpResponse is being closed prematurally (e.g. because client
decided to close its request) we need to propagate cancellation
to the stream which is being piped into the response. Otherwise
we will keep that stream forever hanging around and leak underlying
resources.
Fixes https://github.com/dart-lang/sdk/issues/55886
TEST=tests/standalone/io/regress_55886_test.dart
R=kustermann@google.com
Change-Id: I7c294ed19cc7c350fd101b078bd650ce8a6526a2
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/369061
Reviewed-by: Martin Kustermann <kustermann@google.com>
Commit-Queue: Martin Kustermann <kustermann@google.com>
Original change: https://dart-review.googlesource.com/c/sdk/+/366963
This reverts commit 72b2883c6f.
[js_runtime, js_dev_runtime] Implement `microsecond` field of `DataTime`
- Move DateTime implementation for dart2js and DDC into a shared place to reduce duplication.
- Add a _microsecond field to the web DateTime to track microseconds outside of the JavaScript Date.
- The cute dart2js optimization whereby `DateTime.now().millisecondsSinceEpoch` is compiled to `Date.now()` still works.
- Both implementations report better errors.
- Fixed VM bug with in-range sentinel.
Issue: https://github.com/dart-lang/sdk/issues/44876
Issue: https://github.com/firebase/flutterfire/issues/12102
Issue: b/342552853
CoreLibraryReviewExempt: Reapply of unchanged code
Change-Id: I7f14b69e412a052ef3fe6b43cc9cf9d96319adb8
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/368380
Commit-Queue: Stephen Adams <sra@google.com>
Reviewed-by: Lasse Nielsen <lrn@google.com>
Delay changing Thread::vm_tag on callback entry and restore the tag early on callback return so that the profiler doesn't see the "running Dart" tag unless it can also see the fake return address marking the entry frame.
TEST=ffi/async_void_function_callbacks, ffi/function_callbacks_subtype, ffi/function_callbacks, ffi/isolate_local_function_callbacks
Bug: https://github.com/dart-lang/sdk/issues/52814
Change-Id: I40d80ec7c44063d078db0e211565e2d127c6b81e
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/367460
Reviewed-by: Daco Harkes <dacoharkes@google.com>
Commit-Queue: Ryan Macnak <rmacnak@google.com>
Equal types should have the same hash, but they are not necessarily
identical.
Update the test to remove the identity check between a constant type and
a type constructed in runtime.
Change-Id: I0d6c6395c587391d3087c26b00fff36d645b33dd
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/368340
Reviewed-by: Lasse Nielsen <lrn@google.com>
Commit-Queue: Ömer Ağacan <omersa@google.com>
We have an optimization that will do list lookups at compile time when
the receiver is a constant list and the index is a constant integer.
=> We should only perform this optimization if index is in-bounds.
=> If it's out-of-bounds it should be a [RangeError] thrown at runtime
(if that code is ever executed)
Closes https://github.com/dart-lang/sdk/issues/55817
Change-Id: I3e99cdd96c79e7ff3f490babb2d52131cbd83a88
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/368302
Commit-Queue: Martin Kustermann <kustermann@google.com>
Reviewed-by: Ömer Ağacan <omersa@google.com>
This reverts commit fb057ea4e0.
Reason for revert: b/342552853
Original change's description:
> [js_runtime, js_dev_runtime] Implement `microsecond` field of `DataTime`
>
> - Move DateTime implementation for dart2js and DDC into a shared place to reduce duplication.
>
> - Add a _microsecond field to the web DateTime to track microseconds outside of the JavaScript Date.
>
> - The cute dart2js optimization whereby `DateTime.now().millisecondsSinceEpoch` is compiled to `Date.now()` still works.
>
> - Both implementations report better errors.
>
> - Fixed VM bug with in-range sentinel.
>
>
> Change-Id: I9156255bdb6ecc195500ae9bc88f91fb315b6297
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/366963
> Reviewed-by: Alexander Aprelev <aam@google.com>
> Reviewed-by: Martin Kustermann <kustermann@google.com>
> Reviewed-by: Lasse Nielsen <lrn@google.com>
> Commit-Queue: Stephen Adams <sra@google.com>
Change-Id: I58572256a7710df4589bb5e41c7afee295c2388b
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/368103
Reviewed-by: Alexander Thomas <athom@google.com>
Reviewed-by: Martin Kustermann <kustermann@google.com>
Auto-Submit: Ivan Inozemtsev <iinozemtsev@google.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
