OpenJDK 27 · sun.jvm.hotspot.oops.Oop · APIdia, the JavaDoc alternative

Modifier and Type	Field and Description
private static NarrowKlassField	compressedKlass
private OopHandle	handle
private static long	headerSize
private ObjectHeap	heap
private static CIntField	mark

Access	Constructor and Description
pack-priv	Oop(OopHandle handle, ObjectHeap heap)

Method Summary

Modifier and Type	Method and Description
public static long	alignObjectOffset(long offset)
public static long	alignObjectSize(long size)
public boolean	equals(Object obj) Overrides java.lang.Object.equals. Indicates whether some other object is "equal to" this one.
public OopHandle	getHandle() Should not be used or needed by most clients outside this package; is needed, however, by `sun.jvm.hotspot.utilities.MarkBits`.
public static long	getHeaderSize()
pack-priv ObjectHeap	getHeap()
public Klass	getKlass()
public static Klass	getKlassForOopHandle(OopHandle handle)
public Mark	getMark()
public long	getObjectSize()
public int	hashCode() Overrides java.lang.Object.hashCode. Returns a hash code value for this object.
public long	identityHash() Identity hash in the target VM
private static synchronized void	initialize(TypeDataBase db)
public boolean	isA(Klass k)
public boolean	isArray()
public boolean	isInstance()
public boolean	isInstanceRef()
public boolean	isObjArray()
public boolean	isThread()
public boolean	isTypeArray()
public void	iterate(OopVisitor visitor, boolean doVMFields)
pack-priv void	iterateFields(OopVisitor visitor, boolean doVMFields)
public void	print()
public void	printOn(PrintStream tty)
public static void	printOopAddressOn(Oop obj, PrintStream tty)
public static void	printOopValueOn(Oop obj, PrintStream tty)
public void	printRaw()
public void	printRawOn(PrintStream tty)
public void	printValue()
public void	printValueOn(PrintStream tty)
public long	slowIdentityHash()
public boolean	verify()

Inherited from java.lang.Object:: clone finalize getClass notify notifyAll toString wait wait wait

compressedKlass	back to summary
private static NarrowKlassField compressedKlass

handle	back to summary
private OopHandle handle

headerSize	back to summary
private static long headerSize

heap	back to summary
private ObjectHeap heap

mark	back to summary
private static CIntField mark

Oop	back to summary
pack-priv Oop(OopHandle handle, ObjectHeap heap)

Method Detail

alignObjectOffset	back to summary
public static long alignObjectOffset(long offset)

alignObjectSize	back to summary
public static long alignObjectSize(long size)

equals back to summary

equals	back to summary
public boolean equals(Object obj) Overrides java.lang.Object.equals. Doc from java.lang.Object.equals. Indicates whether some other object is "equal to" this one. The `equals` method implements an equivalence relation on non-null object references: It is reflexive: for any non-null reference value `x`, `x.equals(x)` should return `true`. It is symmetric: for any non-null reference values `x` and `y`, `x.equals(y)` should return `true` if and only if `y.equals(x)` returns `true`. It is transitive: for any non-null reference values `x`, `y`, and `z`, if `x.equals(y)` returns `true` and `y.equals(z)` returns `true`, then `x.equals(z)` should return `true`. It is consistent: for any non-null reference values `x` and `y`, multiple invocations of `x.equals(y)` consistently return `true` or consistently return `false`, provided no information used in `equals` comparisons on the objects is modified. For any non-null reference value `x`, `x.equals(null)` should return `false`. An equivalence relation partitions the elements it operates on into equivalence classes; all the members of an equivalence class are equal to each other. Members of an equivalence class are substitutable for each other, at least for some purposes.

public boolean equals(Object obj)

Overrides java.lang.Object.equals.

Doc from java.lang.Object.equals.

Indicates whether some other object is "equal to" this one.

The equals method implements an equivalence relation on non-null object references:

It is reflexive: for any non-null reference value x, x.equals(x) should return true.
It is symmetric: for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
It is transitive: for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
It is consistent: for any non-null reference values x and y, multiple invocations of x.equals(y) consistently return true or consistently return false, provided no information used in equals comparisons on the objects is modified.
For any non-null reference value x, x.equals(null) should return false.

An equivalence relation partitions the elements it operates on into equivalence classes; all the members of an equivalence class are equal to each other. Members of an equivalence class are substitutable for each other, at least for some purposes.

getHandle	back to summary
public OopHandle getHandle() Should not be used or needed by most clients outside this package; is needed, however, by `sun.jvm.hotspot.utilities.MarkBits`.

getHeaderSize	back to summary
public static long getHeaderSize()

getHeap	back to summary
pack-priv ObjectHeap getHeap()

getKlass	back to summary
public Klass getKlass()

getKlassForOopHandle	back to summary
public static Klass getKlassForOopHandle(OopHandle handle)

getMark	back to summary
public Mark getMark()

getObjectSize	back to summary
public long getObjectSize()

hashCode back to summary

hashCode	back to summary
public int hashCode() Overrides java.lang.Object.hashCode. Doc from java.lang.Object.hashCode. Returns a hash code value for this object. This method is supported for the benefit of hash tables such as those provided by `java.util.HashMap`. The general contract of `hashCode` is: Whenever it is invoked on the same object more than once during an execution of a Java application, the `hashCode` method must consistently return the same integer, provided no information used in `equals` comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application. If two objects are equal according to the `equals` method, then calling the `hashCode` method on each of the two objects must produce the same integer result. It is not required that if two objects are unequal according to the `equals` method, then calling the `hashCode` method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.

public int hashCode()

Overrides java.lang.Object.hashCode.

Doc from java.lang.Object.hashCode.

Returns a hash code value for this object. This method is supported for the benefit of hash tables such as those provided by java.util.HashMap.

The general contract of hashCode is:

Whenever it is invoked on the same object more than once during an execution of a Java application, the hashCode method must consistently return the same integer, provided no information used in equals comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
If two objects are equal according to the equals method, then calling the hashCode method on each of the two objects must produce the same integer result.
It is not required that if two objects are unequal according to the equals method, then calling the hashCode method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.

identityHash	back to summary
public long identityHash() Identity hash in the target VM

initialize	back to summary
private static synchronized void initialize(TypeDataBase db) throws WrongTypeException

isA	back to summary
public boolean isA(Klass k)

isArray	back to summary
public boolean isArray()

isInstance	back to summary
public boolean isInstance()

isInstanceRef	back to summary
public boolean isInstanceRef()

isObjArray	back to summary
public boolean isObjArray()

isThread	back to summary
public boolean isThread()

isTypeArray	back to summary
public boolean isTypeArray()

iterate	back to summary
public void iterate(OopVisitor visitor, boolean doVMFields)

iterateFields	back to summary
pack-priv void iterateFields(OopVisitor visitor, boolean doVMFields)

print	back to summary
public void print()

printOn	back to summary
public void printOn(PrintStream tty)

printOopAddressOn	back to summary
public static void printOopAddressOn(Oop obj, PrintStream tty)

printOopValueOn	back to summary
public static void printOopValueOn(Oop obj, PrintStream tty)

printRaw	back to summary
public void printRaw()

printRawOn	back to summary
public void printRawOn(PrintStream tty)

printValue	back to summary
public void printValue()

printValueOn	back to summary
public void printValueOn(PrintStream tty)

slowIdentityHash	back to summary
public long slowIdentityHash()

verify	back to summary
public boolean verify()

public Class Oop

Field Summary

Constructor Summary

Method Summary

Field Detail

Constructor Detail

Method Detail