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.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
(package private) static class	SpecializationDatabase.MethodSet<T> The following defines a set of methods that share a common "key"

Field Summary

Fields

Modifier and Type	Field and Description
private static HashSetRVM<SpecializedMethod>	deferredMethods
private static boolean	specializationInProgress
private static ImmutableEntryHashMapRVM<RVMMethod,SpecializationDatabase.MethodSet<RVMMethod>>	specialVersionsHash

Constructor Summary

Constructors

Constructor and Description
SpecializationDatabase()

Method Summary

Modifier and Type	Method and Description
static void	doDeferredSpecializations() Drain the queue of methods waiting for specialized code generation.
private static <T> SpecializationDatabase.MethodSet<T>	findOrCreateMethodSet(ImmutableEntryHashMapRVM<T,SpecializationDatabase.MethodSet<T>> hash, T key) Looks up the MethodSet corresponding to a given key in the database.
(package private) static int	getSpecialVersionCount(RVMMethod m)
(package private) static Iterator<SpecializedMethod>	getSpecialVersions(RVMMethod m)
private static void	registerCompiledMethod(SpecializedMethod m)
(package private) static void	registerSpecialVersion(SpecializedMethod spMethod) Records a new specialized method in this database.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

specializationInProgress

private static boolean specializationInProgress

deferredMethods

private static final HashSetRVM<SpecializedMethod> deferredMethods

specialVersionsHash

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

Constructor Detail

SpecializationDatabase

public SpecializationDatabase()

Method Detail

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)

Parameters:

m - the method whose specialized methods are queried

Returns:

an iteration of specialized compiled versions, null if no specialized versions

getSpecialVersionCount

static int getSpecialVersionCount(RVMMethod m)

registerSpecialVersion

static void registerSpecialVersion(SpecializedMethod spMethod)

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

Parameters:

spMethod - the method to register

findOrCreateMethodSet

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

Looks up the MethodSet corresponding to a given key in the database.

Type Parameters:

T - type of the key in the database

Parameters:

hash - the database

key - the key

Returns:

the method set for the given key