com.oracle.svm.core.code

Class RuntimeCodeInfoMemory

java.lang.Object

com.oracle.svm.core.code.RuntimeCodeInfoMemory

public class RuntimeCodeInfoMemory
extends Object

Keeps track of CodeInfo structures of runtime-compiled methods (including invalidated and not yet freed ones) and releases their memory on tear-down.

Implementation: linear probing hash table adapted from OpenJDK IdentityHashMap.

All methods in here need to be either uninterruptible or it must be ensured that they are only called by the GC. This is necessary because the GC can invalidate code as well. So, it must be guaranteed that none of these methods is executed when a GC is triggered as we would end up with races between the application and the GC otherwise.

Method Summary

Modifier and Type	Method and Description
void	add(CodeInfo info)
int	getCount()
boolean	printLocationInfo(Log log, org.graalvm.word.UnsignedWord value, boolean allowJavaHeapAccess, boolean allowUnsafeOperations)
void	printTable(Log log, boolean allowJavaHeapAccess, boolean allowUnsafeOperations)
boolean	remove(CodeInfo info)
boolean	removeDuringGC(CodeInfo info)
static RuntimeCodeInfoMemory	singleton()
void	tearDown()
boolean	walkRuntimeMethodsDuringGC(RuntimeCodeCache.CodeInfoVisitor visitor)
boolean	walkRuntimeMethodsUninterruptibly(RuntimeCodeCache.CodeInfoVisitor visitor)

Methods inherited from class java.lang.Object

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

Method Detail

singleton

public static RuntimeCodeInfoMemory singleton()

getCount

public int getCount()

add

public void add(CodeInfo info)

remove

public boolean remove(CodeInfo info)

removeDuringGC

public boolean removeDuringGC(CodeInfo info)

walkRuntimeMethodsDuringGC

public boolean walkRuntimeMethodsDuringGC(RuntimeCodeCache.CodeInfoVisitor visitor)

walkRuntimeMethodsUninterruptibly

public boolean walkRuntimeMethodsUninterruptibly(RuntimeCodeCache.CodeInfoVisitor visitor)

printTable

public void printTable(Log log,
                       boolean allowJavaHeapAccess,
                       boolean allowUnsafeOperations)

tearDown

public void tearDown()

printLocationInfo

public boolean printLocationInfo(Log log,
                                 org.graalvm.word.UnsignedWord value,
                                 boolean allowJavaHeapAccess,
                                 boolean allowUnsafeOperations)