Module openj9.dtfj

Package com.ibm.j9ddr.vm29.view.dtfj.java

Class DTFJJavaRuntime

java.lang.Object

com.ibm.j9ddr.vm29.view.dtfj.java.DTFJJavaRuntime

All Implemented Interfaces:

JavaRuntime, ManagedRuntime

public class DTFJJavaRuntime
extends Object
implements JavaRuntime

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
class	DTFJJavaRuntime.DTFJRootScanner

Constructor Summary

Constructors

Constructor	Description
DTFJJavaRuntime()

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object other)	Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison.
Iterator	getCompiledMethods()	This is short cut method.
String	getFullVersion()	Get the 'full' version information for this runtime.
DTFJJavaHeap	getHeapFromAddress(ImagePointer address)
Iterator	getHeapRoots()	Get the set of object and class roots known to the VM.
Iterator	getHeaps()	Get the set of heaps known by the VM
Iterator	getJavaClassLoaders()	Get the set of class loaders active in this VM
ImagePointer	getJavaVM()	Get the object that represents the virtual machine
JavaVMInitArgs	getJavaVMInitArgs()	Fetch the JavaVMInitArgs which were used to create this VM.
Properties	getJITProperties()	Get any vendor specific properties in use by the JIT for this Java runtime
Iterator<?>	getMemoryCategories()	Returns iterator of the top-level memory categories used by this Java runtime.
Iterator<?>	getMemorySections(boolean includeFreed)	Returns an iterator of JavaRuntimeMemorySection objects corresponding to the blocks of memory allocated by the JavaRuntime.
Iterator	getMonitors()	Provides access to the collection of monitors used in the JavaVM.
JavaObject	getNestedPackedArrayObject(JavaClass jc, ImagePointer i, int arrayLength)
JavaObject	getNestedPackedObject(JavaClass jc, ImagePointer packedDataAddress)
JavaObject	getObjectAtAddress(ImagePointer address)	Gets the object located at address address in the heap.
long	getStartTime()	Return the JVM start time.
long	getStartTimeNanos()	Return the value of the system nanotime (high resolution timer) at JVM start.
Iterator	getThreads()	Get the set of Java threads known by the VM
Object	getTraceBuffer(String arg0, boolean arg1)	Fetches implementation specific trace buffers, like the verbose GC buffer or the Universal Trace Engine (UTE) buffer
String	getVersion()	Get the version data available for this runtime instance.
int	hashCode()	Answers an integer hash code for the receiver.
boolean	isJITEnabled()	Determine if the JIT was enabled for this Java runtime.

Methods declared in class java.lang.Object

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

Methods declared in interface com.ibm.dtfj.java.JavaRuntime

getSystemProperty

Constructor Details

DTFJJavaRuntime

public DTFJJavaRuntime()

Method Details

equals

public boolean equals(Object other)

Description copied from class: java.lang.Object

Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison. The implementation in Object answers true only if the argument is the exact same object as the receiver (==).

Specified by:

equals in interface JavaRuntime

Overrides:

equals in class Object

Parameters:

other - Object the object to compare with this object.

Returns:

boolean true if the object is the same as this object false if it is different from this object.

See Also:

• Object.hashCode()

hashCode

public int hashCode()

Description copied from class: java.lang.Object

Answers an integer hash code for the receiver. Any two objects which answer true when passed to .equals must answer the same value for this method.

Specified by:

hashCode in interface JavaRuntime

Overrides:

hashCode in class Object

Returns:

the receiver's hash.

See Also:

• Object.equals(java.lang.Object)

getCompiledMethods

public Iterator getCompiledMethods()

Description copied from interface: JavaRuntime

This is short cut method. The same result can be found by iterating over all methods in all class loaders in all classes.

Specified by:

getCompiledMethods in interface JavaRuntime

Returns:

an iterator over all of the JavaMethods in the JavaRuntime which have been compiled

See Also:

• JavaMethod
• CorruptData

getHeapRoots

public Iterator getHeapRoots()

Description copied from interface: JavaRuntime

Get the set of object and class roots known to the VM. Stack frame roots are not included in the set, they can be retrieved using JavaStackFrame.getHeapRoots().

Specified by:

getHeapRoots in interface JavaRuntime

Returns:

an iterator over the collection of JavaReferences representing the known global heap roots within this runtime.

See Also:

• JavaReference
• JavaStackFrame
• CorruptData

isJITEnabled

public boolean isJITEnabled()
                     throws CorruptDataException

Description copied from interface: JavaRuntime

Determine if the JIT was enabled for this Java runtime.

Specified by:

isJITEnabled in interface JavaRuntime

Returns:

true if the JIT was enabled, false if not

Throws:

CorruptDataException

getJITProperties

public Properties getJITProperties()
                            throws DataUnavailable,
CorruptDataException

Description copied from interface: JavaRuntime

Get any vendor specific properties in use by the JIT for this Java runtime

Specified by:

getJITProperties in interface JavaRuntime

Returns:

the set of properties, which may be empty if none were set.

Throws:

DataUnavailable - if the JIT was not enabled for this runtime

CorruptDataException

getHeaps

public Iterator getHeaps()
                  throws UnsupportedOperationException

Description copied from interface: JavaRuntime

Get the set of heaps known by the VM

Specified by:

getHeaps in interface JavaRuntime

Returns:

an iterator for all of the Java heaps within this runtime. Heaps may be specific to this JavaVM instance, or may be shared between multiple JavaVM instances

Throws:

UnsupportedOperationException

See Also:

• JavaHeap
• CorruptData

getJavaClassLoaders

public Iterator getJavaClassLoaders()

Description copied from interface: JavaRuntime

Get the set of class loaders active in this VM

Specified by:

getJavaClassLoaders in interface JavaRuntime

Returns:

an iterator of all of the class loaders within this JavaVM

See Also:

• JavaClassLoader
• CorruptData

getJavaVM

public ImagePointer getJavaVM()
                       throws CorruptDataException

Description copied from interface: JavaRuntime

Get the object that represents the virtual machine

Specified by:

getJavaVM in interface JavaRuntime

Returns:

the address of the JavaVM structure which represents this JVM instance in JNI

Throws:

CorruptDataException

getJavaVMInitArgs

public JavaVMInitArgs getJavaVMInitArgs()
                                 throws DataUnavailable,
CorruptDataException

Description copied from interface: JavaRuntime

Fetch the JavaVMInitArgs which were used to create this VM. See JNI_CreateJavaVM in the JNI Specification for more details.

Specified by:

getJavaVMInitArgs in interface JavaRuntime

Returns:

the JavaVMInitArgs which were used to create this VM.

Throws:

DataUnavailable - if the arguments are not available

CorruptDataException

getMonitors

public Iterator getMonitors()

Description copied from interface: JavaRuntime

Provides access to the collection of monitors used in the JavaVM. This collection includes both monitors associated with managed objects (e.g. object monitors) and monitors associated with internal control structures (e.g. raw monitors)

Specified by:

getMonitors in interface JavaRuntime

Returns:

an iterator over the collection of monitors

See Also:

• JavaMonitor
• CorruptData

getObjectAtAddress

public JavaObject getObjectAtAddress(ImagePointer address)
                              throws CorruptDataException,
IllegalArgumentException,
MemoryAccessException,
DataUnavailable

Description copied from interface: JavaRuntime

Gets the object located at address address in the heap.

Specified by:

getObjectAtAddress in interface JavaRuntime

Parameters:

address - the ImagePointer instance representing the start address of object in the heap;

Returns:

the JavaObject instance representing the located object.

Throws:

CorruptDataException - if any data needed to build the returned instance of JavaObject is corrupt.

IllegalArgumentException - if address is outside the heap's boundaries, or if it doesn't point to the start location of an object;

MemoryAccessException - if address is in the heap but it's not accessible from the dump;

DataUnavailable - if any data needed to build the returned instance of JavaObject is not available.

See Also:

• JavaObject

getHeapFromAddress

public DTFJJavaHeap getHeapFromAddress(ImagePointer address)

getThreads

public Iterator getThreads()

Description copied from interface: JavaRuntime

Get the set of Java threads known by the VM

Specified by:

getThreads in interface JavaRuntime

Returns:

an iterator of the JavaThreads in the runtime

See Also:

• JavaThread
• CorruptData

getTraceBuffer

public Object getTraceBuffer(String arg0,
 boolean arg1)
                      throws CorruptDataException

Description copied from interface: JavaRuntime

Fetches implementation specific trace buffers, like the verbose GC buffer or the Universal Trace Engine (UTE) buffer

Specified by:

getTraceBuffer in interface JavaRuntime

Parameters:

arg0 - a String naming the buffer to be fetched

arg1 - true if formatting should be performed on the buffer, or false if the raw buffer contents should be returned

Returns:

an implementation specific result, depending on the parameters

Throws:

CorruptDataException

getFullVersion

public String getFullVersion()
                      throws CorruptDataException

Description copied from interface: ManagedRuntime

Get the 'full' version information for this runtime.

Specified by:

getFullVersion in interface ManagedRuntime

Returns:

a string representation of the version information for this runtime instance

Throws:

CorruptDataException - If the runtime presents no understandable version data

See Also:

• ManagedRuntime.getVersion()

getVersion

public String getVersion()
                  throws CorruptDataException

Description copied from interface: ManagedRuntime

Get the version data available for this runtime instance.

Specified by:

getVersion in interface ManagedRuntime

Returns:

a string representing all the version data available for this runtime instance.

Throws:

CorruptDataException - If the runtime presents no understandable version data

getMemoryCategories

public Iterator<?> getMemoryCategories()
                                throws DataUnavailable

Description copied from interface: JavaRuntime

Returns iterator of the top-level memory categories used by this Java runtime.

Specified by:

getMemoryCategories in interface JavaRuntime

Returns:

Iterator of memory categories

Throws:

DataUnavailable

See Also:

• CorruptData

getMemorySections

public Iterator<?> getMemorySections(boolean includeFreed)
                              throws DataUnavailable

Description copied from interface: JavaRuntime

Returns an iterator of JavaRuntimeMemorySection objects corresponding to the blocks of memory allocated by the JavaRuntime.

Specified by:

getMemorySections in interface JavaRuntime

Parameters:

includeFreed - If true, iterator will iterate over blocks of memory that have been freed, but haven't been re-used yet.

Returns:

Iterator of memory sections.

Throws:

DataUnavailable

See Also:

• CorruptData

getNestedPackedObject

public JavaObject getNestedPackedObject(JavaClass jc,
 ImagePointer packedDataAddress)
                                 throws DataUnavailable

Throws:

DataUnavailable

getNestedPackedArrayObject

public JavaObject getNestedPackedArrayObject(JavaClass jc,
 ImagePointer i,
 int arrayLength)
                                      throws DataUnavailable

Throws:

DataUnavailable

getStartTime

public long getStartTime()
                  throws DataUnavailable,
CorruptDataException

Return the JVM start time.

Specified by:

getStartTime in interface JavaRuntime

Returns:

long - JVM start time (milliseconds since 1970)

Throws:

DataUnavailable - if the JVM start time is not available

CorruptDataException - if the JVM start time is corrupted

getStartTimeNanos

public long getStartTimeNanos()
                       throws DataUnavailable,
CorruptDataException

Return the value of the system nanotime (high resolution timer) at JVM start.

Specified by:

getStartTimeNanos in interface JavaRuntime

Returns:

long - system nanotime at JVM start

Throws:

DataUnavailable - if the JVM start time is not available

CorruptDataException - if the JVM start time is corrupted