com.oracle.svm.core.heap

Class RuntimeCodeCacheCleaner

java.lang.Object

com.oracle.svm.core.heap.RuntimeCodeCacheCleaner

All Implemented Interfaces:

RuntimeCodeCache.CodeInfoVisitor

public final class RuntimeCodeCacheCleaner
extends Object
implements RuntimeCodeCache.CodeInfoVisitor

Cleans the code cache and frees the unmanaged memory that is used by CodeInfo objects. Furthermore, it also actively invalidates and frees code that has references to otherwise no longer reachable Java heap objects.

Field Summary

Fields

Modifier and Type

Field and Description

static Class<?>[]

CLASSES_ASSUMED_REACHABLE To avoid unnecessary deoptimizations, we need to assume that objects of the following classes are reachable, even if they don't have any strong references: SpeculationLog.SpeculationReason objects are embedded in the code and only needed when a deoptimization is triggered. SharedRuntimeMethod objects are sometimes used as artifical methods (e.g., for adapter code) and are located in the frame info object constants.

Constructor Summary

Constructors

Constructor and Description
RuntimeCodeCacheCleaner()

Method Summary

Modifier and Type	Method and Description
<T extends CodeInfo> boolean	visitCode(T codeInfo) Visit compiled code, using the provided access methods.

Methods inherited from class java.lang.Object

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

Field Detail

CLASSES_ASSUMED_REACHABLE

public static final Class<?>[] CLASSES_ASSUMED_REACHABLE

To avoid unnecessary deoptimizations, we need to assume that objects of the following classes are reachable, even if they don't have any strong references:

• SpeculationLog.SpeculationReason objects are embedded in the code and only needed when a deoptimization is triggered.
• SharedRuntimeMethod objects are sometimes used as artifical methods (e.g., for adapter code) and are located in the frame info object constants.

Constructor Detail

RuntimeCodeCacheCleaner

public RuntimeCodeCacheCleaner()

Method Detail

visitCode

public <T extends CodeInfo> boolean visitCode(T codeInfo)

Description copied from interface: RuntimeCodeCache.CodeInfoVisitor

Visit compiled code, using the provided access methods. Return true if visiting should continue, else false.

Specified by:

visitCode in interface RuntimeCodeCache.CodeInfoVisitor