Object

scala.tools.nsc.Global

analysis

Related Doc: package Global

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object analysis extends TypeFlowAnalysis

ICode analysis for optimization

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Global.scala
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Type Members

  1. case class CallsiteInfo(bb: Global.icodes.BasicBlock, receiver: Global.Symbol, stackLength: Int, concreteMethod: Global.Symbol) extends Product with Serializable

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    Definition Classes
    TypeFlowAnalysis
  2. class MTFAGrowable extends MethodTFA

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    A full type-flow analysis on a method computes in- and out-flows for each basic block (that's what MethodTFA does).

    A full type-flow analysis on a method computes in- and out-flows for each basic block (that's what MethodTFA does).

    For the purposes of Inliner, doing so guarantees that an abstract typestack-slot is available by the time an inlining candidate (a CALL_METHOD instruction) is visited. This subclass (MTFAGrowable) of MethodTFA also aims at performing such analysis on CALL_METHOD instructions, with some differences:

    (a) early screening is performed while the type-flow is being computed (in an override of blockTransfer) by testing a subset of the conditions that Inliner checks later. The reasoning here is: if the early check fails at some iteration, there's no chance a follow-up iteration (with a yet more lub-ed typestack-slot) will succeed. Failure is sufficient to remove that particular CALL_METHOD from the typeflow's remainingCALLs. A forward note: in case inlining occurs at some basic block B, all blocks reachable from B get their CALL_METHOD instructions considered again as candidates (because of the more precise types that -- perhaps -- can be computed).

    (b) in case the early check does not fail, no conclusive decision can be made, thus the CALL_METHOD stays isOnwatchlist.

    In other words, remainingCALLs tracks those callsites that still remain as candidates for inlining, so that Inliner can focus on those. remainingCALLs also caches info about the typestack just before the callsite, so as to spare computing them again at inlining time.

    Besides caching, a further optimization involves skipping those basic blocks whose in-flow and out-flow isn't needed anyway (as explained next). A basic block lacking a callsite in remainingCALLs, when visited by the standard algorithm, won't cause any inlining. But as we know from the way type-flows are computed, computing the in- and out-flow for a basic block relies in general on those of other basic blocks. In detail, we want to focus on that sub-graph of the CFG such that control flow may reach a remaining candidate callsite. Those basic blocks not in that subgraph can be skipped altogether. That's why:

    • forwardAnalysis() in MTFAGrowable now checks for inclusion of a basic block in relevantBBs
    • same check is performed before adding a block to the worklist, and as part of choosing successors. The bookkeeping supporting on-the-fly pruning of irrelevant blocks requires overriding most methods of the dataflow-analysis.

    The rest of the story takes place in Inliner, which does not visit all of the method's basic blocks but only on those represented in remainingCALLs.

    Definition Classes
    TypeFlowAnalysis
  3. class MethodTFA extends DataFlowAnalysis[typeFlowLattice.type]

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    Definition Classes
    TypeFlowAnalysis
  4. class Timer extends AnyRef

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    Definition Classes
    TypeFlowAnalysis
  5. class VarBinding extends HashMap[Global.icodes.Local, Global.icodes.TypeKind]

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    A map which returns the bottom type for unfound elements

    A map which returns the bottom type for unfound elements

    Definition Classes
    TypeFlowAnalysis

Value Members

  1. final def !=(arg0: Any): Boolean

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    Test two objects for inequality.

    Test two objects for inequality.

    returns

    true if !(this == that), false otherwise.

    Definition Classes
    AnyRef → Any
  2. final def ##(): Int

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    Equivalent to x.hashCode except for boxed numeric types and null.

    Equivalent to x.hashCode except for boxed numeric types and null. 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. For null returns a hashcode where null.hashCode throws a NullPointerException.

    returns

    a hash value consistent with ==

    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean

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    The expression x == that is equivalent to if (x eq null) that eq null else x.equals(that).

    The expression x == that is equivalent to if (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
  4. final def asInstanceOf[T0]: T0

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    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 a ClassCastException at runtime, while the expression List(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 type T0.

  5. def clone(): AnyRef

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    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

  6. final def eq(arg0: AnyRef): Boolean

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    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 of AnyRef, and has three additional properties:

    • It is consistent: for any non-null instances x and y of type AnyRef, multiple invocations of x.eq(y) consistently returns true or consistently returns false.
    • For any non-null instance x of type AnyRef, x.eq(null) and null.eq(x) returns false.
    • null.eq(null) returns true.

    When overriding the equals or hashCode 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
  7. def equals(arg0: Any): Boolean

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    The equality method for reference types.

    The equality method for reference types. Default implementation delegates to eq.

    See also equals in scala.Any.

    returns

    true if the receiver object is equivalent to the argument; false otherwise.

    Definition Classes
    AnyRef → Any
  8. def finalize(): Unit

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    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 between finalize 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

  9. final def getClass(): Class[_]

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    A representation that corresponds to the dynamic class of the receiver object.

    A representation that corresponds to the dynamic class of the receiver object.

    The nature of the representation is platform dependent.

    returns

    a representation that corresponds to the dynamic class of the receiver object.

    Definition Classes
    AnyRef → Any
    Note

    not specified by SLS as a member of AnyRef

  10. val global: Global.this.type

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    Definition Classes
    analysisTypeFlowAnalysis
  11. def hashCode(): Int

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    The hashCode method for reference types.

    The hashCode method for reference types. See hashCode in scala.Any.

    returns

    the hash code value for this object.

    Definition Classes
    AnyRef → Any
  12. final def isInstanceOf[T0]: Boolean

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    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 return false, while the expression List(1).isInstanceOf[List[String]] will return true. 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 type T0; false otherwise.

    Definition Classes
    Any
  13. final def ne(arg0: AnyRef): Boolean

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    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
  14. final def notify(): Unit

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    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

  15. final def notifyAll(): Unit

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    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

  16. final def synchronized[T0](arg0: ⇒ T0): T0

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    Definition Classes
    AnyRef
  17. val timer: Timer

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    Definition Classes
    TypeFlowAnalysis
  18. def toString(): String

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    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
  19. object typeFlowLattice extends SemiLattice

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    The type flow lattice contains a binding from local variable names to types and a type stack.

    The type flow lattice contains a binding from local variable names to types and a type stack.

    Definition Classes
    TypeFlowAnalysis
  20. object typeLattice extends SemiLattice

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    The lattice of ICode types.

    The lattice of ICode types.

    Definition Classes
    TypeFlowAnalysis
  21. object typeStackLattice extends SemiLattice

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    The lattice of type stacks.

    The lattice of type stacks. It is a straight forward extension of the type lattice (lub is pairwise lub of the list elements).

    Definition Classes
    TypeFlowAnalysis
  22. final def wait(): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  23. final def wait(arg0: Long, arg1: Int): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )
  24. final def wait(arg0: Long): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

Inherited from TypeFlowAnalysis

Inherited from AnyRef

Inherited from Any

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