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. SI-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
- Hide All
- Show All
- Public
- All
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
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
Test two objects for inequality.
Test two objects for inequality.
- returns
true
if !(this == that), false otherwise.
- Definition Classes
- AnyRef → Any
-
final
def
##(): Int
Equivalent to
x.hashCode
except for boxed numeric types andnull
.Equivalent to
x.hashCode
except for boxed numeric types andnull
. For numerics, it returns a hash value which is consistent with value equality: if two value type instances compare as true, then ## will produce the same hash value for each of them. Fornull
returns a hashcode wherenull.hashCode
throws aNullPointerException
.- returns
a hash value consistent with ==
- 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
The expression
x == that
is equivalent toif (x eq null) that eq null else x.equals(that)
.The expression
x == that
is equivalent toif (x eq null) that eq null else x.equals(that)
.- returns
true
if the receiver object is equivalent to the argument;false
otherwise.
- Definition Classes
- AnyRef → Any
-
def
alignAcrossRows(xss: List[List[Any]], sep: String, lineSep: String = "\n"): String
- Definition Classes
- Logic
-
final
def
asInstanceOf[T0]: T0
Cast the receiver object to be of type
T0
.Cast the receiver object to be of type
T0
.Note that the success of a cast at runtime is modulo Scala's erasure semantics. Therefore the expression
1.asInstanceOf[String]
will throw aClassCastException
at runtime, while the expressionList(1).asInstanceOf[List[String]]
will not. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the requested type.- returns
the receiver object.
- Definition Classes
- Any
- Exceptions thrown
ClassCastException
if the receiver object is not an instance of the erasure of typeT0
.
-
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 SI-1503, SI-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
Create a copy of the receiver object.
Create a copy of the receiver object.
The default implementation of the
clone
method is platform dependent.- returns
a copy of the receiver object.
- Attributes
- protected[java.lang]
- Definition Classes
- AnyRef
- Annotations
- @throws( ... )
- Note
not specified by SLS as a member of AnyRef
-
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
Tests whether the argument (
that
) is a reference to the receiver object (this
).Tests whether the argument (
that
) is a reference to the receiver object (this
).The
eq
method implements an equivalence relation on non-null instances ofAnyRef
, and has three additional properties:- It is consistent: for any non-null instances
x
andy
of typeAnyRef
, multiple invocations ofx.eq(y)
consistently returnstrue
or consistently returnsfalse
. - For any non-null instance
x
of typeAnyRef
,x.eq(null)
andnull.eq(x)
returnsfalse
. null.eq(null)
returnstrue
.
When overriding the
equals
orhashCode
methods, it is important to ensure that their behavior is consistent with reference equality. Therefore, if two objects are references to each other (o1 eq o2
), they should be equal to each other (o1 == o2
) and they should hash to the same value (o1.hashCode == o2.hashCode
).- returns
true
if the argument is a reference to the receiver object;false
otherwise.
- Definition Classes
- AnyRef
- It is consistent: for any non-null instances
-
def
equals(arg0: Any): Boolean
The equality method for reference types.
-
def
equivalentTree(a: Global.Tree, b: Global.Tree): Boolean
- Definition Classes
- TreeAndTypeAnalysis
-
def
finalize(): Unit
Called by the garbage collector on the receiver object when there are no more references to the object.
Called by the garbage collector on the receiver object when there are no more references to the object.
The details of when and if the
finalize
method is invoked, as well as the interaction betweenfinalize
and non-local returns and exceptions, are all platform dependent.- Attributes
- protected[java.lang]
- Definition Classes
- AnyRef
- Annotations
- @throws( classOf[java.lang.Throwable] )
- Note
not specified by SLS as a member of AnyRef
-
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[_]
Returns the runtime class representation of the object.
Returns the runtime class representation of the object.
- returns
a class object corresponding to the runtime type of the receiver.
- Definition Classes
- AnyRef → Any
-
final
def
hasStableSymbol(p: Global.Tree): Boolean
- Attributes
- protected
- Definition Classes
- Interface
-
def
hashCode(): Int
The hashCode method for reference types.
-
def
instanceOfTpImplies(tp: Global.Type, tpImplied: Global.Type): Boolean
- Definition Classes
- TreeAndTypeAnalysis
-
final
def
isInstanceOf[T0]: Boolean
Test whether the dynamic type of the receiver object is
T0
.Test whether the dynamic type of the receiver object is
T0
.Note that the result of the test is modulo Scala's erasure semantics. Therefore the expression
1.isInstanceOf[String]
will returnfalse
, while the expressionList(1).isInstanceOf[List[String]]
will returntrue
. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the specified type.- returns
true
if the receiver object is an instance of erasure of typeT0
;false
otherwise.
- 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
Equivalent to
!(this eq that)
.Equivalent to
!(this eq that)
.- returns
true
if the argument is not a reference to the receiver object;false
otherwise.
- Definition Classes
- AnyRef
-
final
def
notify(): Unit
Wakes up a single thread that is waiting on the receiver object's monitor.
Wakes up a single thread that is waiting on the receiver object's monitor.
- Definition Classes
- AnyRef
- Note
not specified by SLS as a member of AnyRef
-
final
def
notifyAll(): Unit
Wakes up all threads that are waiting on the receiver object's monitor.
Wakes up all threads that are waiting on the receiver object's monitor.
- Definition Classes
- AnyRef
- Note
not specified by SLS as a member of AnyRef
-
final
def
synchronized[T0](arg0: ⇒ T0): T0
- Definition Classes
- AnyRef
-
def
toString(): String
Creates a String representation of this object.
Creates a String representation of this object. The default representation is platform dependent. On the java platform it is the concatenation of the class name, "@", and the object's hashcode in hexadecimal.
- returns
a String representation of the object.
- 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
- @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 API.
The following resources are useful for Scala plugin/compiler development: