Java example source code file (VirtualMachine.java)
The VirtualMachine.java Java example source code
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package com.sun.jdi;
import com.sun.jdi.event.EventQueue;
import com.sun.jdi.request.EventRequestManager;
import java.util.List;
import java.util.Map;
/**
* A virtual machine targeted for debugging.
* More precisely, a {@link Mirror mirror} representing the
* composite state of the target VM.
* All other mirrors are associated with an instance of this
* interface. Access to all other mirrors is achieved
* directly or indirectly through an instance of this
* interface.
* Access to global VM properties and control of VM execution
* are supported directly by this interface.
* <P>
* Instances of this interface are created by instances of
* {@link com.sun.jdi.connect.Connector}. For example,
* an {@link com.sun.jdi.connect.AttachingConnector AttachingConnector}
* attaches to a target VM and returns its virtual machine mirror.
* A Connector will typically create a VirtualMachine by invoking
* the VirtualMachineManager's {@link
* com.sun.jdi.VirtualMachineManager#createVirtualMachine(Connection)}
* createVirtualMachine(Connection) method.
* <p>
* Note that a target VM launched by a launching connector is not
* guaranteed to be stable until after the {@link com.sun.jdi.event.VMStartEvent} has been
* received.
* <p>
* Any method on <code>VirtualMachine which
* takes <code>VirtualMachine as an parameter may throw
* {@link com.sun.jdi.VMDisconnectedException} if the target VM is
* disconnected and the {@link com.sun.jdi.event.VMDisconnectEvent} has been or is
* available to be read from the {@link com.sun.jdi.event.EventQueue}.
* <p>
* Any method on <code>VirtualMachine which
* takes <code>VirtualMachine as an parameter may throw
* {@link com.sun.jdi.VMOutOfMemoryException} if the target VM has run out of memory.
*
* @author Robert Field
* @author Gordon Hirsch
* @author James McIlree
* @since 1.3
*/
@jdk.Exported
public interface VirtualMachine extends Mirror {
/**
* Returns the loaded reference types that
* match a given name. The name must be fully qualified
* (for example, java.lang.String). The returned list
* will contain a {@link ReferenceType} for each class
* or interface found with the given name. The search
* is confined to loaded classes only; no attempt is made
* to load a class of the given name.
* <P>
* The returned list will include reference types
* loaded at least to the point of preparation and
* types (like array) for which preparation is
* not defined.
*
* @param className the class/interface name to search for
* @return a list of {@link ReferenceType} objects, each
* mirroring a type in the target VM with the given name.
*/
List<ReferenceType> classesByName(String className);
/**
* Returns all loaded types. For each loaded type in the target
* VM a {@link ReferenceType} will be placed in the returned list.
* The list will include ReferenceTypes which mirror classes,
* interfaces, and array types.
* <P>
* The returned list will include reference types
* loaded at least to the point of preparation and
* types (like array) for which preparation is
* not defined.
*
* @return a list of {@link ReferenceType} objects, each mirroring
* a loaded type in the target VM.
*/
List<ReferenceType> allClasses();
/**
* All classes given are redefined according to the
* definitions supplied. A method in a redefined class
* is called 'equivalent' (to the old version of the
* method) if
* <UL>
* <LI>their bytecodes are the same except for indicies into
* the constant pool, and
* <LI>the referenced constants are equal.
* </UL>
* Otherwise, the new method is called 'non-equivalent'.
* If a redefined method has active stack frames, those active
* frames continue to run the bytecodes of the previous version of the
* method. If the new version of such a method is non-equivalent,
* then a method from one of these active frames is called 'obsolete' and
* {@link Method#isObsolete Method.isObsolete()}
* will return true when called on one of these methods.
* If resetting such a frame is desired, use
* {@link ThreadReference#popFrames ThreadReference.popFrames(StackFrame)}
* to pop the old obsolete method execution from the stack.
* New invocations of redefined methods will always invoke the new versions.
* <p>
* This function does not cause any initialization except
* that which would occur under the customary JVM semantics.
* In other words, redefining a class does not cause
* its initializers to be run. The values of preexisting
* static variables will remain as they were prior to the
* call. However, completely uninitialized (new) static
* variables will be assigned their default value.
* <p>
* If a redefined class has instances then all those
* instances will have the fields defined by the redefined
* class at the completion of the call. Preexisting fields
* will retain their previous values. Any new fields will
* have their default values; no instance initializers or
* constructors are run.
* <p>
* Threads need not be suspended.
* <p>
* No events are generated by this function.
* <p>
* All breakpoints in the redefined classes are deleted.
* <p>
* Not all target virtual machines support this operation.
* Use {@link #canRedefineClasses() canRedefineClasses()}
* to determine if the operation is supported.
* Use {@link #canAddMethod() canAddMethod()}
* to determine if the redefinition can add methods.
* Use {@link #canUnrestrictedlyRedefineClasses() canUnrestrictedlyRedefineClasses()}
* to determine if the redefinition can change the schema,
* delete methods, change the class hierarchy, etc.
*
* @param classToBytes A map from {@link ReferenceType}
* to array of byte.
* The bytes represent the new class definition and
* are in Java Virtual Machine class file format.
*
* @throws java.lang.UnsupportedOperationException if
* the target virtual machine does not support this
* operation.
* <UL>
* <LI>If {@link #canRedefineClasses() canRedefineClasses()}
* is false any call of this method will throw this exception.
* <LI>If {@link #canAddMethod() canAddMethod()} is false
* attempting to add a method will throw this exception.
* <LI>If {@link #canUnrestrictedlyRedefineClasses()
* canUnrestrictedlyRedefineClasses()}
* is false, attempting any of the following will throw
* this exception
* <UL>
* <LI>changing the schema (the fields)
* <LI>changing the hierarchy (subclasses, interfaces)
* <LI>deleting a method
* <LI>changing class modifiers
* <LI>changing method modifiers
* </UL>
* </UL>
*
* @throws java.lang.NoClassDefFoundError if the bytes
* don't correspond to the reference type (the names
* don't match).
*
* @throws java.lang.VerifyError if a "verifier" detects
* that a class, though well formed, contains an internal
* inconsistency or security problem.
*
* @throws java.lang.ClassFormatError if the bytes
* do not represent a valid class.
*
* @throws java.lang.ClassCircularityError if a
* circularity has been detected while initializing a class.
*
* @throws java.lang.UnsupportedClassVersionError if the
* major and minor version numbers in bytes
* are not supported by the VM.
*
* @throws VMCannotBeModifiedException if the VirtualMachine is read-only - see {@link VirtualMachine#canBeModified()}.
*
* @see Method#isObsolete
* @see ThreadReference#popFrames
* @see #canRedefineClasses
* @see #canAddMethod
* @see #canUnrestrictedlyRedefineClasses
*
* @since 1.4
*/
void redefineClasses(Map<? extends ReferenceType,byte[]> classToBytes);
/**
* Returns a list of the currently running threads. For each
* running thread in the target VM, a {@link ThreadReference}
* that mirrors it is placed in the list.
* The returned list contains threads created through
* java.lang.Thread, all native threads attached to
* the target VM through JNI, and system threads created
* by the target VM. Thread objects that have
* not yet been started
* (see {@link java.lang.Thread#start Thread.start()})
* and thread objects that have
* completed their execution are not included in the returned list.
*
* @return a list of {@link ThreadReference} objects, one for each
* running thread in the mirrored VM.
*/
List<ThreadReference> allThreads();
/**
* Suspends the execution of the application running in this
* virtual machine. All threads currently running will be suspended.
* <p>
* Unlike {@link java.lang.Thread#suspend Thread.suspend()},
* suspends of both the virtual machine and individual threads are
* counted. Before a thread will run again, it must be resumed
* (through {@link #resume} or {@link ThreadReference#resume})
* the same number of times it has been suspended.
*
* @throws VMCannotBeModifiedException if the VirtualMachine is read-only - see {@link VirtualMachine#canBeModified()}.
*/
void suspend();
/**
* Continues the execution of the application running in this
* virtual machine. All threads are resumed as documented in
* {@link ThreadReference#resume}.
*
* @throws VMCannotBeModifiedException if the VirtualMachine is read-only - see {@link VirtualMachine#canBeModified()}.
*
* @see #suspend
*/
void resume();
/**
* Returns each thread group which does not have a parent. For each
* top level thread group a {@link ThreadGroupReference} is placed in the
* returned list.
* <p>
* This command may be used as the first step in building a tree
* (or trees) of the existing thread groups.
*
* @return a list of {@link ThreadGroupReference} objects, one for each
* top level thread group.
*/
List<ThreadGroupReference> topLevelThreadGroups();
/**
* Returns the event queue for this virtual machine.
* A virtual machine has only one {@link EventQueue} object, this
* method will return the same instance each time it
* is invoked.
*
* @throws VMCannotBeModifiedException if the VirtualMachine is read-only - see {@link VirtualMachine#canBeModified()}.
*
* @return the {@link EventQueue} for this virtual machine.
*/
EventQueue eventQueue();
/**
* Returns the event request manager for this virtual machine.
* The {@link EventRequestManager} controls user settable events
* such as breakpoints.
* A virtual machine has only one {@link EventRequestManager} object,
* this method will return the same instance each time it
* is invoked.
*
* @throws VMCannotBeModifiedException if the VirtualMachine is read-only - see {@link VirtualMachine#canBeModified()}.
*
* @return the {@link EventRequestManager} for this virtual machine.
*/
EventRequestManager eventRequestManager();
/**
* Creates a {@link BooleanValue} for the given value. This value
* can be used for setting and comparing against a value retrieved
* from a variable or field in this virtual machine.
*
* @param value a boolean for which to create the value
* @return the {@link BooleanValue} for the given boolean.
*/
BooleanValue mirrorOf(boolean value);
/**
* Creates a {@link ByteValue} for the given value. This value
* can be used for setting and comparing against a value retrieved
* from a variable or field in this virtual machine.
*
* @param value a byte for which to create the value
* @return the {@link ByteValue} for the given byte.
*/
ByteValue mirrorOf(byte value);
/**
* Creates a {@link CharValue} for the given value. This value
* can be used for setting and comparing against a value retrieved
* from a variable or field in this virtual machine.
*
* @param value a char for which to create the value
* @return the {@link CharValue} for the given char.
*/
CharValue mirrorOf(char value);
/**
* Creates a {@link ShortValue} for the given value. This value
* can be used for setting and comparing against a value retrieved
* from a variable or field in this virtual machine.
*
* @param value a short for which to create the value
* @return the {@link ShortValue} for the given short.
*/
ShortValue mirrorOf(short value);
/**
* Creates an {@link IntegerValue} for the given value. This value
* can be used for setting and comparing against a value retrieved
* from a variable or field in this virtual machine.
*
* @param value an int for which to create the value
* @return the {@link IntegerValue} for the given int.
*/
IntegerValue mirrorOf(int value);
/**
* Creates a {@link LongValue} for the given value. This value
* can be used for setting and comparing against a value retrieved
* from a variable or field in this virtual machine.
*
* @param value a long for which to create the value
* @return the {@link LongValue} for the given long.
*/
LongValue mirrorOf(long value);
/**
* Creates a {@link FloatValue} for the given value. This value
* can be used for setting and comparing against a value retrieved
* from a variable or field in this virtual machine.
*
* @param value a float for which to create the value
* @return the {@link FloatValue} for the given float.
*/
FloatValue mirrorOf(float value);
/**
* Creates a {@link DoubleValue} for the given value. This value
* can be used for setting and comparing against a value retrieved
* from a variable or field in this virtual machine.
*
* @param value a double for which to create the value
* @return the {@link DoubleValue} for the given double.
*/
DoubleValue mirrorOf(double value);
/**
* Creates a string in this virtual machine.
* The created string can be used for setting and comparing against
* a string value retrieved from a variable or field in this
* virtual machine.
*
* @param value the string to be created
* @return a {@link StringReference} that mirrors the newly created
* string in the target VM.
* @throws VMCannotBeModifiedException if the VirtualMachine is read-only
* -see {@link VirtualMachine#canBeModified()}.
*/
StringReference mirrorOf(String value);
/**
* Creates a {@link VoidValue}. This value
* can be passed to {@link ThreadReference#forceEarlyReturn}
* when a void method is to be exited.
*
* @return the {@link VoidValue}.
*/
VoidValue mirrorOfVoid();
/**
* Returns the {@link java.lang.Process} object for this
* virtual machine if launched
* by a {@link com.sun.jdi.connect.LaunchingConnector}
*
* @return the {@link java.lang.Process} object for this virtual
* machine, or null if it was not launched by a
* {@link com.sun.jdi.connect.LaunchingConnector}.
* @throws VMCannotBeModifiedException if the VirtualMachine is read-only
* -see {@link VirtualMachine#canBeModified()}.
*/
Process process();
/**
* Invalidates this virtual machine mirror.
* The communication channel to the target VM is closed, and
* the target VM prepares to accept another subsequent connection
* from this debugger or another debugger, including the
* following tasks:
* <ul>
* <li>All event requests are cancelled.
* <li>All threads suspended by {@link #suspend} or by
* {@link ThreadReference#suspend} are resumed as many
* times as necessary for them to run.
* <li>Garbage collection is re-enabled in all cases where it was
* disabled through {@link ObjectReference#disableCollection}.
* </ul>
* Any current method invocations executing in the target VM
* are continued after the disconnection. Upon completion of any such
* method invocation, the invoking thread continues from the
* location where it was originally stopped.
* <p>
* Resources originating in
* this VirtualMachine (ObjectReferences, ReferenceTypes, etc.)
* will become invalid.
*/
void dispose();
/**
* Causes the mirrored VM to terminate with the given error code.
* All resources associated with this VirtualMachine are freed.
* If the mirrored VM is remote, the communication channel
* to it will be closed. Resources originating in
* this VirtualMachine (ObjectReferences, ReferenceTypes, etc.)
* will become invalid.
* <p>
* Threads running in the mirrored VM are abruptly terminated.
* A thread death exception is not thrown and
* finally blocks are not run.
*
* @param exitCode the exit code for the target VM. On some platforms,
* the exit code might be truncated, for example, to the lower order 8 bits.
*
* @throws VMCannotBeModifiedException if the VirtualMachine is read-only - see {@link VirtualMachine#canBeModified()}.
*/
void exit(int exitCode);
/**
* Determines if the target VM supports watchpoints
* for field modification.
*
* @return <code>true if the feature is supported,
* <code>false otherwise.
*/
boolean canWatchFieldModification();
/**
* Determines if the target VM supports watchpoints
* for field access.
*
* @return <code>true if the feature is supported,
* <code>false otherwise.
*/
boolean canWatchFieldAccess();
/**
* Determines if the target VM supports the retrieval
* of a method's bytecodes.
*
* @return <code>true if the feature is supported,
* <code>false otherwise.
*/
boolean canGetBytecodes();
/**
* Determines if the target VM supports the query
* of the synthetic attribute of a method or field.
*
* @return <code>true if the feature is supported,
* <code>false otherwise.
*/
boolean canGetSyntheticAttribute();
/**
* Determines if the target VM supports the retrieval
* of the monitors owned by a thread.
*
* @return <code>true if the feature is supported,
* <code>false otherwise.
*/
boolean canGetOwnedMonitorInfo();
/**
* Determines if the target VM supports the retrieval
* of the monitor for which a thread is currently waiting.
*
* @return <code>true if the feature is supported,
* <code>false otherwise.
*/
boolean canGetCurrentContendedMonitor();
/**
* Determines if the target VM supports the retrieval
* of the monitor information for an object.
*
* @return <code>true if the feature is supported,
* <code>false otherwise.
*/
boolean canGetMonitorInfo();
/**
* Determines if the target VM supports filtering
* events by specific instance object. For example,
* see {@link com.sun.jdi.request.BreakpointRequest#addInstanceFilter}.
*
* @return <code>true if the feature is supported,
* <code>false otherwise.
*/
boolean canUseInstanceFilters();
/**
* Determines if the target VM supports any level
* of class redefinition.
* @see #redefineClasses
*
* @return <code>true if the feature is supported,
* <code>false otherwise.
*
* @since 1.4
*/
boolean canRedefineClasses();
/**
* Determines if the target VM supports the addition
* of methods when performing class redefinition.
* @see #redefineClasses
*
* @return <code>true if the feature is supported,
* <code>false otherwise.
*
* @since 1.4
*/
boolean canAddMethod();
/**
* Determines if the target VM supports unrestricted
* changes when performing class redefinition.
* @see #redefineClasses
*
* @return <code>true if the feature is supported,
* <code>false otherwise.
*
* @since 1.4
*/
boolean canUnrestrictedlyRedefineClasses();
/**
* Determines if the target VM supports popping
* frames of a threads stack.
* @see ThreadReference#popFrames
*
* @return <code>true if the feature is supported,
* <code>false otherwise.
*
* @since 1.4
*/
boolean canPopFrames();
/**
* Determines if the target VM supports getting
* the source debug extension.
* @see ReferenceType#sourceDebugExtension
*
* @return <code>true if the feature is supported,
* <code>false otherwise.
*
* @since 1.4
*/
boolean canGetSourceDebugExtension();
/**
* Determines if the target VM supports the creation of
* {@link com.sun.jdi.request.VMDeathRequest}s.
* @see com.sun.jdi.request.EventRequestManager#createVMDeathRequest
*
* @return <code>true if the feature is supported,
* <code>false otherwise.
*
* @since 1.4
*/
boolean canRequestVMDeathEvent();
/**
* Determines if the target VM supports the inclusion of return values
* in
* {@link com.sun.jdi.event.MethodExitEvent}s.
* @see com.sun.jdi.request.EventRequestManager#createMethodExitRequest
*
* @return <code>true if the feature is supported,
* <code>false otherwise.
*
* @since 1.6
*/
boolean canGetMethodReturnValues();
/**
* Determines if the target VM supports the accessing of class instances,
* instance counts, and referring objects.
*
* @see #instanceCounts
* @see ReferenceType#instances(long)
* @see ObjectReference#referringObjects(long)
*
* @return <code>true if the feature is supported,
* <code>false otherwise.
*
* @since 1.6
*/
boolean canGetInstanceInfo();
/**
* Determines if the target VM supports the filtering of
* class prepare events by source name.
*
* see {@link com.sun.jdi.request.ClassPrepareRequest#addSourceNameFilter}.
* @return <code>true if the feature is supported,
* <code>false otherwise.
*
* @since 1.6
*/
boolean canUseSourceNameFilters();
/**
* Determines if the target VM supports the forcing of a method to
* return early.
*
* @see ThreadReference#forceEarlyReturn(Value)
*
* @return <code>true if the feature is supported,
* <code>false otherwise.
*
* @since 1.6
*/
boolean canForceEarlyReturn();
/**
* Determines if the target VM is a read-only VM. If a method which
* would modify the state of the VM is called on a read-only VM,
* then {@link VMCannotBeModifiedException} is thrown.
*
* @return <code>true if the feature is supported,
* <code>false otherwise.
*
* @since 1.5
*/
boolean canBeModified();
/**
* Determines if the target VM supports the creation of
* {@link com.sun.jdi.request.MonitorContendedEnterRequest}s.
* {@link com.sun.jdi.request.MonitorContendedEnteredRequest}s.
* {@link com.sun.jdi.request.MonitorWaitRequest}s.
* {@link com.sun.jdi.request.MonitorWaitedRequest}s.
* @see com.sun.jdi.request.EventRequestManager#createMonitorContendedEnterRequest
* @see com.sun.jdi.request.EventRequestManager#createMonitorContendedEnteredRequest
* @see com.sun.jdi.request.EventRequestManager#createMonitorWaitRequest
* @see com.sun.jdi.request.EventRequestManager#createMonitorWaitedRequest
*
* @return <code>true if the feature is supported,
* <code>false otherwise.
*
* @since 1.6
*/
boolean canRequestMonitorEvents();
/**
* Determines if the target VM supports getting which
* frame has acquired a monitor.
* @see com.sun.jdi.ThreadReference#ownedMonitorsAndFrames
*
* @return <code>true if the feature is supported,
* <code>false otherwise.
*
* @since 1.6
*/
boolean canGetMonitorFrameInfo();
/**
* Determines if the target VM supports reading class file
* major and minor versions.
*
* @see ReferenceType#majorVersion()
* @see ReferenceType#minorVersion()
*
* @return <code>true if the feature is supported,
* <code>false otherwise.
*
* @since 1.6
*/
boolean canGetClassFileVersion();
/**
* Determines if the target VM supports getting constant pool
* information of a class.
*
* @see ReferenceType#constantPoolCount()
* @see ReferenceType#constantPool()
*
* @return <code>true if the feature is supported,
* <code>false otherwise.
*
* @since 1.6
*/
boolean canGetConstantPool();
/**
* Set this VM's default stratum (see {@link Location} for a
* discussion of strata). Overrides the per-class default set
* in the class file.
* <P>
* Affects location queries (such as,
* {@link Location#sourceName()})
* and the line boundaries used in
* single stepping.
*
* @param stratum the stratum to set as VM default,
* or null to use per-class defaults.
*
* @throws java.lang.UnsupportedOperationException if the
* target virtual machine does not support this operation.
*
* @since 1.4
*/
void setDefaultStratum(String stratum);
/**
* Return this VM's default stratum.
*
* @see #setDefaultStratum(String)
* @see ReferenceType#defaultStratum()
* @return <code>null (meaning that the per-class
* default - {@link ReferenceType#defaultStratum()} -
* should be used) unless the default stratum has been
* set with
* {@link #setDefaultStratum(String)}.
*
* @since 1.4
*/
String getDefaultStratum();
/**
* Returns the number of instances of each ReferenceType in the 'refTypes'
* list.
* Only instances that are reachable for the purposes of garbage collection
* are counted.
* <p>
* Not all target virtual machines support this operation.
* Use {@link VirtualMachine#canGetInstanceInfo()}
* to determine if the operation is supported.
*
* @see ReferenceType#instances(long)
* @see ObjectReference#referringObjects(long)
* @param refTypes the list of {@link ReferenceType} objects for which counts
* are to be obtained.
*
* @return an array of <code>long containing one element for each
* element in the 'refTypes' list. Element i of the array contains
* the number of instances in the target VM of the ReferenceType at
* position i in the 'refTypes' list.
* If the 'refTypes' list is empty, a zero-length array is returned.
* If a ReferenceType in refTypes has been garbage collected, zero
* is returned for its instance count.
* @throws java.lang.UnsupportedOperationException if
* the target virtual machine does not support this
* operation - see
* {@link VirtualMachine#canGetInstanceInfo() canGetInstanceInfo()}
* @throws NullPointerException if the 'refTypes' list is null.
* @since 1.6
*/
long[] instanceCounts(List<? extends ReferenceType> refTypes);
/**
* Returns text information on the target VM and the
* debugger support that mirrors it. No specific format
* for this information is guaranteed.
* Typically, this string contains version information for the
* target VM and debugger interfaces.
* More precise information
* on VM and JDI versions is available through
* {@link #version}, {@link VirtualMachineManager#majorInterfaceVersion},
* and {@link VirtualMachineManager#minorInterfaceVersion}
*
* @return the description.
*/
String description();
/**
* Returns the version of the Java Runtime Environment in the target
* VM as reported by the property <code>java.version.
* For obtaining the JDI interface version, use
* {@link VirtualMachineManager#majorInterfaceVersion}
* and {@link VirtualMachineManager#minorInterfaceVersion}
*
* @return the target VM version.
*/
String version();
/**
* Returns the name of the target VM as reported by the
* property <code>java.vm.name.
*
* @return the target VM name.
*/
String name();
/** All tracing is disabled. */
int TRACE_NONE = 0x00000000;
/** Tracing enabled for JDWP packets sent to target VM. */
int TRACE_SENDS = 0x00000001;
/** Tracing enabled for JDWP packets received from target VM. */
int TRACE_RECEIVES = 0x00000002;
/** Tracing enabled for internal event handling. */
int TRACE_EVENTS = 0x00000004;
/** Tracing enabled for internal managment of reference types. */
int TRACE_REFTYPES = 0x00000008;
/** Tracing enabled for internal management of object references. */
int TRACE_OBJREFS = 0x00000010;
/** All tracing is enabled. */
int TRACE_ALL = 0x00ffffff;
/**
* Traces the activities performed by the com.sun.jdi implementation.
* All trace information is output to System.err. The given trace
* flags are used to limit the output to only the information
* desired. The given flags are in effect and the corresponding
* trace will continue until the next call to
* this method.
* <p>
* Output is implementation dependent and trace mode may be ignored.
*
* @param traceFlags identifies which kinds of tracing to enable.
*/
void setDebugTraceMode(int traceFlags);
}
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