Translate assert statements in async functions. The translation of
the condition subexpression can produce a sequence of statements that
have been hoisted out of it. These need to be guarded so they are
executed only when asserts are enabled.
For this purpose, we introduce an AssertBlock. The semantics of the
assert block:
assert { s0; ...; sn; }
is the same as:
if (assertsEnabled) { s0; ...; sn; }
where assertsEnabled is a more primitive nullary expression that is
true iff. assertions are enabled. We chose not to encode this using a
construct like assertsEnabled because (1) we would have to support it
appearing as an arbitrary expression which we don't currently need
and (2) it requires deeper pattern matching to detect and skip the
guarded code when desired.
The translation is more complicated because if there is a message
subexpression in an assert, it is conditionally evaluated only if the
assert's condition is false.
Fixes https://github.com/dart-lang/sdk/issues/28498
Change-Id: I0912a57104ede3160533e49f65b6fb79b76f1500
Reviewed-on: https://dart-review.googlesource.com/46442
Commit-Queue: Kevin Millikin <kmillikin@google.com>
Reviewed-by: Martin Kustermann <kustermann@google.com>
Before: Kernel static errors were represented by throwing a distinguished
error or else by calling a distinguished library const constructor.
Now: Kernel static errors are represented by InvalidExpression. To support
error reporting, InvalidExpression has an optional message and a file
offset. A back end can choose to signal these errors at any time; for
example, when deserializing the binary, or when compiling the procedure
containing the static error, or when the erroneous expression is evaluated
at run time.
InvalidStatement is removed because it can be encoded as ExpressionStatement
of InvalidExpression.
Future work:
* supporting static errors where an expression cannot appear in the AST
* allowing InvalidExpression to contain an Expression for error recovery
* adding a top-level list of static errors and warnings to the binary
Bug: https://github.com/dart-lang/sdk/issues/29840
Change-Id: Ifdfe9a76cee6cefed28061bf245be70531d2f413
Reviewed-on: https://dart-review.googlesource.com/31320
Commit-Queue: Kevin Millikin <kmillikin@google.com>
Reviewed-by: Dan Rubel <danrubel@google.com>
Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
Also, use more descriptive "redirecting_factory" instead of "factory"
in the textual representation of RedirectingFactoryConstructors.
Bug:
Change-Id: Ib01e21107b86e55a10721dde551e802ef3230c80
Reviewed-on: https://dart-review.googlesource.com/24400
Reviewed-by: Peter von der Ahé <ahe@google.com>
Commit-Queue: Dmitry Stefantsov <dmitryas@google.com>
Assert initializers in Dart may be compiled directly to this form of initializer,
rather than through local initializers as is done now.
Bug:
Change-Id: Ia149ea3d1df5d1dc18be5636801604ffaf7ca7d8
Reviewed-on: https://dart-review.googlesource.com/14760
Commit-Queue: Samir Jindel <sjindel@google.com>
Reviewed-by: Kevin Millikin <kmillikin@google.com>
New type of AST nodes RedirectingFactoryConstructor is added to Kernel.
The goal is to keep the information about redirecting factory
constructors in the class for the linking phase.
Change-Id: I7477c617fa7fd4935ceb23098ec7c056d1f286ca
Reviewed-on: https://dart-review.googlesource.com/14740
Commit-Queue: Dmitry Stefantsov <dmitryas@google.com>
Reviewed-by: Peter von der Ahé <ahe@google.com>
Currently we produce 'partial dills' for the VM when compiling through
kernel, i.e. we only include the user-code and whatever canonical names
the user refers to. That's perfectly fine for the VM as it always loads
the platform.dill file too.
We cannot currently print it though.
(Technically we should be able to concatenate it with platform.dill and
print that).
This CL allows us to print these partial dills without concatenating
anything first.
Bug:
Change-Id: I7d5f12332e16623d02531ad46e2dc103222f59e9
Reviewed-on: https://dart-review.googlesource.com/19002
Commit-Queue: Jens Johansen <jensj@google.com>
Reviewed-by: Dmitry Stefantsov <dmitryas@google.com>
The introduced "constants" transformation can evaluate constant expressions. The
original use-sites of constant expressions are replaced by a new [ConstantExpression]
node, which points to a subclass of a new [Constant] class hierarchy. Constant
[Field]s and [VariableDeclarations]s will be removed, since all use-sites are
re-written.
The [Constant] class hierarchy is, similarly to the [DartType] class hierarchy, not
part of the AST tree (also has no parent pointer). The constants form a
DAG (directed acyclic graph).
There is no canonicalization requirement of the [Constant] objects referenced by the
AST (via [ConstantExpression]). Although it is beneficial to canonicalize them during
construction, since it reduces time spent in operator==/hashCode.
This CL furthermore adds support for a constant table in the binary format. Similarly
to [String]s, we canonicalize the constants before writing the table to the binary.
The constant table entries in the binary are written in a post-order way, to ensure
easy construction on the backend side.
The text format will be augmented with a "constants { ... }" section at the end,
which lists the constants in the same order as in the binary format.
The transformation can be used by those backends who choose to do so. It is not
enabled by default atm. It should therefore not affect analyzer, fasta or other
components.
Change-Id: I57cd9624fedcf537ab6870db76246149647bed21
Reviewed-on: https://dart-review.googlesource.com/14382
Commit-Queue: Martin Kustermann <kustermann@google.com>
Reviewed-by: Kevin Millikin <kmillikin@google.com>
This flag indicates when a procedure's return type makes contravariant
use of a class type parameter. The front end will have to insert "as"
checks at any call sites that refer to such a procedure as their
interface target. Placing the flag on the procedure will allow the
front end to determine whether the check is needed once, at the same
time as it's determining the need for covariant parameter checks,
rather than when compiling individual call sites.
Once this lands I will follow up with CLs that cause the front end to
set the flag appropriately, and to generate the necessary "as" checks.
Change-Id: I989fc702bc233384eb5ea8cd630c8efd384ab248
Reviewed-on: https://dart-review.googlesource.com/14365
Reviewed-by: Samir Jindel <sjindel@google.com>
Commit-Queue: Paul Berry <paulberry@google.com>
This type checker can be used to find strong mode violations in the
Kernel files.
This will be used to work on cleaning strong mode violations in VM's patch files
in the absence of any other way to type-check them.
Bug:
Change-Id: Id7005f6312dafe04eb0e7b33d008934b62a1b726
Reviewed-on: https://dart-review.googlesource.com/11883
Commit-Queue: Vyacheslav Egorov <vegorov@google.com>
Reviewed-by: Paul Berry <paulberry@google.com>
Summary:
Previously, we filled in all occurrences of captured type variables with either
"dynamic" or their bound, if they had one.
Now, we add extra type parameters to the top-level function corresponding to the
closure, and pass in the corresponding arguments as type arguments to the
"MakeClosure" operation.
Test Plan:
Updated [type_variables.dart] and added a new test case to it.
R=dmitryas@google.com
Review-Url: https://codereview.chromium.org/2989563002 .
I want to start testing that Fasta sets the static types of
conditional expressions correctly, so I need Fasta's expectations
files to include them.
This CL just adds the static types to the printing logic in
ast_to_text.dart and updates expectations so that the tests continue
to pass. I will make behavioral changes to Fasta in future CLs.
R=kmillikin@google.com
Review-Url: https://codereview.chromium.org/2949753002 .
Kevin Millikin