com.ibm.wala.ssa

Class SSASwitchInstruction

java.lang.Object

com.ibm.wala.ssa.SSAInstruction

com.ibm.wala.ssa.SSASwitchInstruction

public class SSASwitchInstruction
extends SSAInstruction

SSA instruction representing a switch statement.

Nested Class Summary

Nested classes/interfaces inherited from class com.ibm.wala.ssa.SSAInstruction

SSAInstruction.IVisitor, SSAInstruction.Visitor

Field Summary

Fields inherited from class com.ibm.wala.ssa.SSAInstruction

NO_INDEX

Constructor Summary

Constructors

Constructor and Description
SSASwitchInstruction(int iindex, int val, int defaultLabel, int[] casesAndLabels) The labels in casesAndLabels represent instruction indices in the IR that each switch case branches to.

Method Summary

Modifier and Type	Method and Description
SSAInstruction	copyForSSA(SSAInstructionFactory insts, int[] defs, int[] uses) This method is meant to be used during SSA conversion for an IR that is not in SSA form.
int[]	getCasesAndLabels()
int	getDefault()
int	getNumberOfUses()
int	getTarget(int caseValue)
int	getUse(int j)
int	hashCode()
boolean	isFallThrough()
com.ibm.wala.util.intset.IntIterator	iterateLabels()
java.lang.String	toString(SymbolTable symbolTable)
void	visit(SSAInstruction.IVisitor v) Apply an IVisitor to this instruction.

Methods inherited from class com.ibm.wala.ssa.SSAInstruction

equals, getDef, getDef, getExceptionTypes, getNumberOfDefs, getValueString, hasDef, iIndex, isPEI, setInstructionIndex, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

SSASwitchInstruction

public SSASwitchInstruction(int iindex,
                            int val,
                            int defaultLabel,
                            int[] casesAndLabels)

The labels in casesAndLabels represent instruction indices in the IR that each switch case branches to.

Method Detail

copyForSSA

public SSAInstruction copyForSSA(SSAInstructionFactory insts,
                                 int[] defs,
                                 int[] uses)

Description copied from class: SSAInstruction

This method is meant to be used during SSA conversion for an IR that is not in SSA form. It creates a new SSAInstruction of the same type as the receiver, with a combination of the receiver's uses and defs and those from the method parameters.

In particular, if the 'defs' parameter is null, then the new instruction has the same defs as the receiver. If 'defs' is not null, it must be an array with a size equal to the number of defs that the receiver instruction has. In this case, the new instruction has defs taken from the array. The uses of the new instruction work in the same way with the 'uses' parameter.

Note that this only applies to CAst-based IR translation, since Java bytecode-based IR generation uses a different SSA construction mechanism.

TODO: move this into the SSAInstructionFactory

Specified by:

copyForSSA in class SSAInstruction

toString

public java.lang.String toString(SymbolTable symbolTable)

Specified by:

toString in class SSAInstruction

visit

public void visit(SSAInstruction.IVisitor v)

Description copied from class: SSAInstruction

Apply an IVisitor to this instruction. We invoke the appropriate IVisitor method according to the type of this instruction.

Specified by:

visit in class SSAInstruction

getNumberOfUses

public int getNumberOfUses()

Overrides:

getNumberOfUses in class SSAInstruction

getUse

public int getUse(int j)

Overrides:

getUse in class SSAInstruction

Returns:

value number representing the jth use in this instruction. -1 means TOP (i.e., the value doesn't matter)

getTarget

public int getTarget(int caseValue)

getDefault

public int getDefault()

getCasesAndLabels

public int[] getCasesAndLabels()

iterateLabels

public com.ibm.wala.util.intset.IntIterator iterateLabels()

hashCode

public int hashCode()

Specified by:

hashCode in class SSAInstruction

isFallThrough

public boolean isFallThrough()

Specified by:

isFallThrough in class SSAInstruction

Returns:

true iff this instruction may fall through to the next