ValueNumber (SpotBugs 4.2.1 API)

java.lang.Object
- edu.umd.cs.findbugs.ba.vna.ValueNumber

All Implemented Interfaces:

java.lang.Comparable<ValueNumber>
```
public class ValueNumber
extends java.lang.Object
implements java.lang.Comparable<ValueNumber>
```
A "value number" is a value produced somewhere in a methods. We use value numbers as dataflow values in Frames. When two frame slots have the same value number, then the same value is in both of those slots.

Instances of ValueNumbers produced by the same ValueNumberFactory are unique, so reference equality may be used to determine whether or not two value numbers are the same. In general, ValueNumbers from different factories cannot be compared.

Author:

David Hovemeyer

See Also:

ValueNumberAnalysis

Field Summary

Fields
Modifier and Type	Field	Description
`static int`	`ARRAY_VALUE`
`static int`	`CONSTANT_CLASS_OBJECT`
`static int`	`CONSTANT_VALUE`
`static int`	`PHI_NODE`
`static int`	`RETURN_VALUE`	Flag specifying that this value was the return value of a called method.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`int`	`compareTo(ValueNumber other)`
`static ValueNumber`	`createValueNumber(int number)`
`static ValueNumber`	`createValueNumber(int number, int flags)`
`boolean`	`equals(java.lang.Object o)`
`int`	`getFlags()`
`int`	`getNumber()`
`boolean`	`hasFlag(int flag)`
`int`	`hashCode()`
`static int`	`mergeFlags(int flags1, int flags2)`
`java.lang.String`	`toString()`

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail
- RETURN_VALUE
```
public static final int RETURN_VALUE
```
  Flag specifying that this value was the return value of a called method.
  
  See Also:
  
  Constant Field Values
- ARRAY_VALUE
```
public static final int ARRAY_VALUE
```
  See Also:
  
  Constant Field Values
- CONSTANT_CLASS_OBJECT
```
public static final int CONSTANT_CLASS_OBJECT
```
  See Also:
  
  Constant Field Values
- PHI_NODE
```
public static final int PHI_NODE
```
  See Also:
  
  Constant Field Values
- CONSTANT_VALUE
```
public static final int CONSTANT_VALUE
```
  See Also:
  
  Constant Field Values

Method Detail

mergeFlags

public static int mergeFlags(int flags1,
                             int flags2)

createValueNumber

public static ValueNumber createValueNumber(int number,
                                            int flags)

createValueNumber

public static ValueNumber createValueNumber(int number)

getNumber
```
public int getNumber()
```

getFlags
```
public int getFlags()
```

hasFlag
```
public boolean hasFlag(int flag)
```

toString
```
public java.lang.String toString()
```
Overrides:

toString in class java.lang.Object

hashCode
```
public int hashCode()
```
Overrides:

hashCode in class java.lang.Object

equals

public boolean equals(java.lang.Object o)

Overrides:: equals in class java.lang.Object

compareTo
```
public int compareTo(ValueNumber other)
```
Specified by:

compareTo in interface java.lang.Comparable<ValueNumber>