This changes the pattern matching lowering to avoid using late final variables (or lowerings thereof) and instead inline the initializer where used. This avoids generating closures that are hard for backends to reason about and optimize.
Closes#52805Closes#53804
Change-Id: Ia887446dd4d4475d05cf852c812bfe4b851de261
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/338860
Commit-Queue: Johnni Winther <johnniwinther@google.com>
Reviewed-by: Jens Johansen <jensj@google.com>
This changes the pattern lowering to use unchecked AsExpression
instead of promoted VariableGet when this occurs within a late
cache variable initializer. This is done to avoid promoted variables
that violate the (otherwise used) conservative reasoning about the
execution order of closures.
The unchecked AsExpressions are now shown in the ast-to-text.
Change-Id: I4fa6813f3b5cc73d9cdac17054de59e5d4b8ce7d
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/307044
Reviewed-by: Chloe Stefantsova <cstefantsova@google.com>
Commit-Queue: Johnni Winther <johnniwinther@google.com>
Reviewed-by: Nate Biggs <natebiggs@google.com>
This flag is set when a variable declaration is moved earlier in
order to be available for subsequent code that couldn't contain
its declaration. For instance variables declared in patterns which
needs to be declared before the matching expressions that initialize
them.
TEST=existing expectations tests
Change-Id: I80ab1138f08f725f3e01905c1a57a1483f809328
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/291820
Commit-Queue: Johnni Winther <johnniwinther@google.com>
Reviewed-by: Alexander Markov <alexmarkov@google.com>
Reviewed-by: Chloe Stefantsova <cstefantsova@google.com>
This splits cached expression by receiver type such that the initializing
expression for a cached variable isn't stored in the late variable
initializer, if it can be obtained in different ways. For instance having
both a list pattern and a map pattern in the same switch will trigger
caching of the .length property but obtaining expression differ base on
the receiver type, in the first case List.length and in second case
Map.length.
Closes#51138Closes#51140
Change-Id: Ic4d8ca394a872113114514f72274413b836fdfb5
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/280081
Reviewed-by: Chloe Stefantsova <cstefantsova@google.com>
Commit-Queue: Johnni Winther <johnniwinther@google.com>
Johnni Winther