org.jikesrvm.compilers.opt.specialization
Class SpecializationDatabase

java.lang.Object
  org.jikesrvm.compilers.opt.specialization.SpecializationDatabase

public final class SpecializationDatabase
extends Object

Database to store multiple specialized versions for a given method.

The overall design is very similar to that of the InvalidationDatabase (see InvalidationDatabase.java) In this database, the key is the RVMMethod object of the source method and the value is a method set. The method set is a list of specialized versions of the method pointed by the key. Specialized versions are represented by using the SpecializedMethod class. There is no provision for removing/deleting method versions as classes are never unloaded and the ClassLoader.compiledMethods[] is never cleaned.

specializationInProgress

private static boolean specializationInProgress

deferredMethods

private static final HashSetRVM<SpecializedMethod> deferredMethods

specialVersionsHash

private static final ImmutableEntryHashMapRVM<RVMMethod,SpecializationDatabase.MethodSet<RVMMethod>> specialVersionsHash

SpecializationDatabase

public SpecializationDatabase()

doDeferredSpecializations

public static void doDeferredSpecializations()

Drain the queue of methods waiting for specialized code generation.

registerCompiledMethod

private static void registerCompiledMethod(SpecializedMethod m)

getSpecialVersions

static Iterator<SpecializedMethod> getSpecialVersions(RVMMethod m)

Return an iteration of SpecializedMethods that represents specialized compiled versions of the method pointed by RVMMethod

Returns:

null if no specialized versions

getSpecialVersionCount

static int getSpecialVersionCount(RVMMethod m)

registerSpecialVersion

static void registerSpecialVersion(SpecializedMethod spMethod)

Record a new specialized method in this database. Also remember that this method will need to be compiled later, at the next call to doDeferredSpecializations()

findOrCreateMethodSet

private static <T> SpecializationDatabase.MethodSet<T> findOrCreateMethodSet(ImmutableEntryHashMapRVM<T,SpecializationDatabase.MethodSet<T>> hash,
                                                                             T key)

Look up the MethodSet corresponding to a given key in the database If none found, create one.