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
- Alphabetic
- By Inheritance
- MatchOptimization
- MatchAnalysis
- MatchApproximation
- ScalaLogic
- Logic
- TreeAndTypeAnalysis
- MatchTreeMaking
- Debugging
- MatchCodeGen
- Interface
- TreeDSL
- AnyRef
- Any
- by any2stringadd
- by StringFormat
- by Ensuring
- by ArrowAssoc
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- Public
- Protected
Type Members
- 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 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 toany2stringadd[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 toArrowAssoc[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
- Definition Classes
- TreeAndTypeAnalysis
- def clone(): AnyRef
- Attributes
- protected[lang]
- Definition Classes
- AnyRef
- Annotations
- @throws(classOf[java.lang.CloneNotSupportedException]) @native()
- 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 toEnsuring[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 toEnsuring[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 toEnsuring[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 toEnsuring[MatchOptimization] performed by method Ensuring in scala.Predef.
- Definition Classes
- Ensuring
- final def eq(arg0: AnyRef): Boolean
- Definition Classes
- AnyRef
- def equals(arg0: AnyRef): Boolean
- Definition Classes
- AnyRef → Any
- def equivalentTree(a: Global.Tree, b: Global.Tree): Boolean
- Definition Classes
- TreeAndTypeAnalysis
- def finalize(): Unit
- Attributes
- protected[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 toStringFormat[MatchOptimization] performed by method StringFormat in scala.Predef.
- Definition Classes
- StringFormat
- Annotations
- @inline()
- final def getClass(): Class[_ <: AnyRef]
- 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(classOf[java.lang.InterruptedException])
- final def wait(arg0: Long, arg1: Int): Unit
- Definition Classes
- AnyRef
- Annotations
- @throws(classOf[java.lang.InterruptedException])
- final def wait(arg0: Long): Unit
- Definition Classes
- AnyRef
- Annotations
- @throws(classOf[java.lang.InterruptedException]) @native()
- object Suppression extends java.io.Serializable
- Definition Classes
- MatchTreeMaking
Deprecated Value Members
- def →[B](y: B): (MatchOptimization, B)
- Implicit
- This member is added by an implicit conversion from MatchOptimization toArrowAssoc[MatchOptimization] performed by method ArrowAssoc in scala.Predef.
- Definition Classes
- ArrowAssoc
- Annotations
- @deprecated
- Deprecated
(Since version 2.13.0) Use
->
instead. If you still wish to display it as one character, consider using a font with programming ligatures such as Fira Code.
The Scala compiler and reflection APIs.