This phase implements the following transformations:
-
For types of method and class parameters:
=> T becomes () ?=> T
-
For references to cbn-parameters:
x becomes x.apply()
-
For arguments to cbn parameters
e becomes () ?=> e
An optimization is applied: If the argument e
to a cbn parameter is already of type () ?=> T
and is a pure expression, we avoid (2) and (3), i.e. we pass e
directly instead of () ?=> e.apply()
.
Note that () ?=> T
cannot be written in source since user-defined context functions must have at least one parameter. We use the type here as a convenient marker of something that will erase to Function0, and where we know that it came from a by-name parameter.
Note also that the transformation applies only to types of parameters, not to other occurrences of ExprTypes. In particular, embedded occurrences in function types such as (=> T) => U
are left as-is here (they are eliminated in erasure). Trying to convert these as well would mean traversing all the types, and that leads to cyclic reference errors in many cases. This can cause problems in that we might have sometimes a () ?=> T
where a => T
is expected. To compensate, there is a new clause in TypeComparer#subArg that declares () ?=> T
to be a subtype of => T
for arguments of type applications at any point after this phase and up to erasure.
Attributes
- Companion
- object
- Graph
-
- Supertypes
-
trait InfoTransformertrait DenotTransformerclass MiniPhaseclass Phaseclass Objecttrait Matchableclass AnyShow all
- Self type
Members list
Value members
Concrete methods
Can this transform change the parents of a class?
Attributes
- Definition Classes
Denotations with a symbol where infoMayChange
is false are guaranteed to be unaffected by this transform, so transformInfo
need not be run. This can save time, and more importantly, can help avoid forcing symbol completers.
Denotations with a symbol where infoMayChange
is false are guaranteed to be unaffected by this transform, so transformInfo
need not be run. This can save time, and more importantly, can help avoid forcing symbol completers.
Attributes
- Definition Classes
A name given to the Phase
that can be used to debug the compiler. For instance, it is possible to print trees after a given phase using:
A name given to the Phase
that can be used to debug the compiler. For instance, it is possible to print trees after a given phase using:
$ ./bin/scalac -Xprint:<phaseNameHere> sourceFile.scala
Attributes
- Definition Classes
List of names of phases that should have finished their processing of all compilation units before this phase starts
List of names of phases that should have finished their processing of all compilation units before this phase starts
Attributes
- Definition Classes
Attributes
- Definition Classes
Attributes
- Definition Classes
Attributes
- Definition Classes
Attributes
- Definition Classes
Attributes
- Definition Classes
Inherited methods
If set, implicit search is enabled
Do not run if compile progress has been cancelled
Can this transform change the base types of a type?
Can this transform create or delete non-private members?
Check what the phase achieves, to be called at any point after it is finished.
Check what the phase achieves, to be called at any point after it is finished.
Attributes
- Inherited from:
- Phase
Attributes
- Inherited from:
- Phase
True for all phases except NoPhase
Attributes
- Inherited from:
- Phase
The sequence position of this phase in the given context where 0 is reserved for NoPhase and the first real phase is at position 1. -1 if the phase is not installed in the context.
The sequence position of this phase in the given context where 0 is reserved for NoPhase and the first real phase is at position 1. -1 if the phase is not installed in the context.
Attributes
- Inherited from:
- Phase
Attributes
- Inherited from:
- Phase
Output should be checkable by TreeChecker
This property is queried when phases are first assembled. If it is false, the phase will be dropped from the set of phases to traverse.
This property is queried when phases are first assembled. If it is false, the phase will be dropped from the set of phases to traverse.
Attributes
- Inherited from:
- Phase
This property is queried before a phase is run. If it is false, the phase is skipped.
This property is queried before a phase is run. If it is false, the phase is skipped.
Attributes
- Inherited from:
- Phase
Is this phase the standard typerphase? True for TyperPhase, but not for other first phases (such as FromTasty or Parser). The predicate is tested in some places that perform checks and corrections. It's different from ctx.isAfterTyper (and cheaper to test).
Is this phase the standard typerphase? True for TyperPhase, but not for other first phases (such as FromTasty or Parser). The predicate is tested in some places that perform checks and corrections. It's different from ctx.isAfterTyper (and cheaper to test).
Attributes
- Inherited from:
- Phase
Attributes
- Inherited from:
- Phase
The last phase during which the transformed denotations are valid
The last phase during which the transformed denotations are valid
Attributes
- Inherited from:
- DenotTransformer
Cancellable region, if not cancelled, run the body in the context of the current compilation unit. Enrich crash messages.
Cancellable region, if not cancelled, run the body in the context of the current compilation unit. Enrich crash messages.
Attributes
- Inherited from:
- Phase
Attributes
- Inherited from:
- Phase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
A hook that allows to transform the usual context passed to the function that prints a compilation unit after a phase
A hook that allows to transform the usual context passed to the function that prints a compilation unit after a phase
Attributes
- Inherited from:
- Phase
Attributes
- Inherited from:
- Phase
If set, use relaxed typing for all phases in group
Attributes
- Inherited from:
- Phase
Attributes
- Inherited from:
- Phase
List of names of phases that should precede this phase
Attributes
- Inherited from:
- Phase
Attributes
- Inherited from:
- Phase
Attributes
- Inherited from:
- Phase
Convert a compilation unit's tree to a string; can be overridden
Attributes
- Inherited from:
- MiniPhase
skip the phase for a Java compilation unit, may depend on -Yjava-tasty
skip the phase for a Java compilation unit, may depend on -Yjava-tasty
Attributes
- Inherited from:
- Phase
for purposes of progress tracking, overridden in TyperPhase
The transformation method
Transform tree using all transforms of current group (including this one)
Transform tree using all transforms of current group (including this one)
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Transform single node using all transforms following the current one in this group
Transform single node using all transforms following the current one in this group
Attributes
- Inherited from:
- MiniPhase
Transform tree using all transforms following the current one in this group
Transform tree using all transforms following the current one in this group
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- MiniPhase
Attributes
- Inherited from:
- Phase
The validity period of the transformed denotations in the given context
The validity period of the transformed denotations in the given context
Attributes
- Inherited from:
- DenotTransformer
Inherited fields
Attributes
- Inherited from:
- MiniPhase