trait MatchOptimization extends MatchTreeMaking with MatchAnalysis
Optimize and analyze matches based on their TreeMaker-representation.
The patmat translation doesn't rely on this, so it could be disabled in principle.
- well, not quite: the backend crashes if we emit duplicates in switches (e.g. scala/bug#7290)
- Source
- MatchOptimization.scala
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- MatchOptimization
- MatchAnalysis
- MatchApproximation
- ScalaLogic
- Logic
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- Debugging
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- by any2stringadd
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Type Members
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trait
MatchMonadInterface extends AnyRef
Interface with user-defined match monad? if there's a
__match
in scope, we use this as the match strategy, assuming it conforms to MatchStrategy as defined below:Interface with user-defined match monad? if there's a
__match
in scope, we use this as the match strategy, assuming it conforms to MatchStrategy as defined below:type Matcher[P[_], M[+_], A] = { def flatMap[B](f: P[A] => M[B]): M[B] def orElse[B >: A](alternative: => M[B]): M[B] } abstract class MatchStrategy[P[_], M[+_]] { // runs the matcher on the given input def runOrElse[T, U](in: P[T])(matcher: P[T] => M[U]): P[U] def zero: M[Nothing] def one[T](x: P[T]): M[T] def guard[T](cond: P[Boolean], then: => P[T]): M[T] }
P and M are derived from one's signature (
def one[T](x: P[T]): M[T]
)if no
__match
is found, we assume the following implementation (and generate optimized code accordingly)object __match extends MatchStrategy[({type Id[x] = x})#Id, Option] { def zero = None def one[T](x: T) = Some(x) // NOTE: guard's return type must be of the shape M[T], where M is the monad in which the pattern match should be interpreted def guard[T](cond: Boolean, then: => T): Option[T] = if(cond) Some(then) else None def runOrElse[T, U](x: T)(f: T => Option[U]): U = f(x) getOrElse (throw new MatchError(x)) }
- Definition Classes
- Interface
-
trait
TypedSubstitution extends MatchMonadInterface
- Definition Classes
- Interface
-
trait
PropositionalLogic extends AnyRef
- Definition Classes
- Logic
-
trait
MatchAnalyzer extends MatchApproximator
- Definition Classes
- MatchAnalysis
-
trait
MatchApproximator extends TreeMakers with TreesAndTypesDomain
Represent a match as a formula in propositional logic that encodes whether the match matches (abstractly: we only consider types)
Represent a match as a formula in propositional logic that encodes whether the match matches (abstractly: we only consider types)
- Definition Classes
- MatchApproximation
-
trait
CodegenCore extends MatchMonadInterface
- Definition Classes
- MatchCodeGen
-
trait
OptimizedCodegen extends CodegenCore with TypedSubstitution with MatchMonadInterface
- Definition Classes
- MatchCodeGen
-
trait
PureCodegen extends CodegenCore with PureMatchMonadInterface
- Definition Classes
- MatchCodeGen
-
trait
PureMatchMonadInterface extends MatchMonadInterface
- Definition Classes
- MatchCodeGen
- trait CommonSubconditionElimination extends OptimizedCodegen with MatchApproximator
- trait MatchOptimizer extends OptimizedCodegen with SwitchEmission with CommonSubconditionElimination
- trait SwitchEmission extends TreeMakers with MatchMonadInterface
-
final
case class
Suppression(suppressExhaustive: Boolean, suppressUnreachable: Boolean) extends Product with Serializable
- Definition Classes
- MatchTreeMaking
-
trait
TreeMakers extends TypedSubstitution with CodegenCore
- Definition Classes
- MatchTreeMaking
-
trait
TreesAndTypesDomain extends PropositionalLogic with CheckableTreeAndTypeAnalysis
- Definition Classes
- ScalaLogic
-
trait
CheckableTreeAndTypeAnalysis extends AnyRef
- Definition Classes
- TreeAndTypeAnalysis
Concrete Value Members
-
object
CODE
- Definition Classes
- TreeDSL
-
object
debug
- Definition Classes
- Debugging
-
object
vpmName
- Definition Classes
- Interface
-
final
def
!=(arg0: Any): Boolean
- Definition Classes
- AnyRef → Any
-
final
def
##(): Int
- Definition Classes
- AnyRef → Any
-
def
+(other: String): String
- Implicit
- This member is added by an implicit conversion from MatchOptimization to any2stringadd[MatchOptimization] performed by method any2stringadd in scala.Predef.
- Definition Classes
- any2stringadd
-
def
->[B](y: B): (MatchOptimization, B)
- Implicit
- This member is added by an implicit conversion from MatchOptimization to ArrowAssoc[MatchOptimization] performed by method ArrowAssoc in scala.Predef.
- Definition Classes
- ArrowAssoc
- Annotations
- @inline()
-
final
def
==(arg0: Any): Boolean
- Definition Classes
- AnyRef → Any
-
def
alignAcrossRows(xss: List[List[Any]], sep: String, lineSep: String = "\n"): String
- Definition Classes
- Logic
-
final
def
asInstanceOf[T0]: T0
- Definition Classes
- Any
-
def
binderTypeImpliedByPattern(pat: Global.Tree, pt: Global.Type, binder: Global.Symbol): Global.Type
Compute the type T implied for a value
v
matched by a patternpat
(with expected typept
).Compute the type T implied for a value
v
matched by a patternpat
(with expected typept
).Usually, this is the pattern's type because pattern matching implies instance-of checks.
However, Stable Identifier and Literal patterns are matched using
==
, which does not imply a type for the binder that binds the matched value.See scala/bug#1503, scala/bug#5024: don't cast binders to types we're not sure they have
TODO: update spec as follows (deviation between
**
):A pattern binder x@p consists of a pattern variable x and a pattern p. The type of the variable x is the static type T **IMPLIED BY** the pattern p. This pattern matches any value v matched by the pattern p **Deleted: , provided the run-time type of v is also an instance of T, ** and it binds the variable name to that value.
Addition: A pattern
p
_implies_ a typeT
if the pattern matches only values of the typeT
.- Definition Classes
- TreeAndTypeAnalysis
-
def
clone(): AnyRef
- Attributes
- protected[java.lang]
- Definition Classes
- AnyRef
- Annotations
- @native() @throws( ... )
-
final
def
dealiasWiden(tp: Global.Type): Global.Type
- Attributes
- protected
- Definition Classes
- Interface
-
def
ensuring(cond: (MatchOptimization) ⇒ Boolean, msg: ⇒ Any): MatchOptimization
- Implicit
- This member is added by an implicit conversion from MatchOptimization to Ensuring[MatchOptimization] performed by method Ensuring in scala.Predef.
- Definition Classes
- Ensuring
-
def
ensuring(cond: (MatchOptimization) ⇒ Boolean): MatchOptimization
- Implicit
- This member is added by an implicit conversion from MatchOptimization to Ensuring[MatchOptimization] performed by method Ensuring in scala.Predef.
- Definition Classes
- Ensuring
-
def
ensuring(cond: Boolean, msg: ⇒ Any): MatchOptimization
- Implicit
- This member is added by an implicit conversion from MatchOptimization to Ensuring[MatchOptimization] performed by method Ensuring in scala.Predef.
- Definition Classes
- Ensuring
-
def
ensuring(cond: Boolean): MatchOptimization
- Implicit
- This member is added by an implicit conversion from MatchOptimization to Ensuring[MatchOptimization] performed by method Ensuring in scala.Predef.
- Definition Classes
- Ensuring
-
final
def
eq(arg0: AnyRef): Boolean
- Definition Classes
- AnyRef
-
def
equals(arg0: Any): Boolean
- Definition Classes
- AnyRef → Any
-
def
equivalentTree(a: Global.Tree, b: Global.Tree): Boolean
- Definition Classes
- TreeAndTypeAnalysis
-
def
finalize(): Unit
- Attributes
- protected[java.lang]
- Definition Classes
- AnyRef
- Annotations
- @throws( classOf[java.lang.Throwable] )
-
def
formatted(fmtstr: String): String
- Implicit
- This member is added by an implicit conversion from MatchOptimization to StringFormat[MatchOptimization] performed by method StringFormat in scala.Predef.
- Definition Classes
- StringFormat
- Annotations
- @inline()
-
final
def
getClass(): Class[_]
- Definition Classes
- AnyRef → Any
- Annotations
- @native()
-
final
def
hasStableSymbol(p: Global.Tree): Boolean
- Attributes
- protected
- Definition Classes
- Interface
-
def
hashCode(): Int
- Definition Classes
- AnyRef → Any
- Annotations
- @native()
-
def
instanceOfTpImplies(tp: Global.Type, tpImplied: Global.Type): Boolean
- Definition Classes
- TreeAndTypeAnalysis
-
final
def
isInstanceOf[T0]: Boolean
- Definition Classes
- Any
-
final
def
mkFALSE: Global.Literal
- Attributes
- protected
- Definition Classes
- Interface
-
final
def
mkTRUE: Global.Literal
- Attributes
- protected
- Definition Classes
- Interface
-
final
def
ne(arg0: AnyRef): Boolean
- Definition Classes
- AnyRef
-
final
def
notify(): Unit
- Definition Classes
- AnyRef
- Annotations
- @native()
-
final
def
notifyAll(): Unit
- Definition Classes
- AnyRef
- Annotations
- @native()
-
final
def
synchronized[T0](arg0: ⇒ T0): T0
- Definition Classes
- AnyRef
-
def
toString(): String
- Definition Classes
- AnyRef → Any
-
final
def
wait(): Unit
- Definition Classes
- AnyRef
- Annotations
- @throws( ... )
-
final
def
wait(arg0: Long, arg1: Int): Unit
- Definition Classes
- AnyRef
- Annotations
- @throws( ... )
-
final
def
wait(arg0: Long): Unit
- Definition Classes
- AnyRef
- Annotations
- @native() @throws( ... )
-
def
→[B](y: B): (MatchOptimization, B)
- Implicit
- This member is added by an implicit conversion from MatchOptimization to ArrowAssoc[MatchOptimization] performed by method ArrowAssoc in scala.Predef.
- Definition Classes
- ArrowAssoc
-
object
Suppression extends Serializable
- Definition Classes
- MatchTreeMaking
The Scala compiler and reflection APIs.