Package com.ibm.wala.ssa

Class SSAComparisonInstruction

java.lang.Object

com.ibm.wala.ssa.SSAInstruction

com.ibm.wala.ssa.SSAComparisonInstruction

public class SSAComparisonInstruction
extends SSAInstruction

SSA Instruction for comparisons between floats, longs and doubles

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	Description
SSAComparisonInstruction(int iindex, com.ibm.wala.shrike.shrikeBT.IComparisonInstruction.Operator operator, int result, int val1, int val2)

Method Summary

Modifier and Type	Method	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	getDef()
int	getDef(int i)	Return the ith def
int	getNumberOfDefs()
int	getNumberOfUses()
com.ibm.wala.shrike.shrikeBT.IComparisonInstruction.Operator	getOperator()
int	getUse(int j)
boolean	hasDef()	Does this instruction define a normal value, as distinct from a set of exceptions possibly thrown by it (e.g.
int	hashCode()
boolean	isFallThrough()
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, getExceptionTypes, getValueString, iIndex, isPEI, setInstructionIndex, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

SSAComparisonInstruction

public SSAComparisonInstruction(int iindex,
                                com.ibm.wala.shrike.shrikeBT.IComparisonInstruction.Operator operator,
                                int result,
                                int val1,
                                int val2)

Method Detail

copyForSSA

public SSAInstruction copyForSSA(SSAInstructionFactory insts,
                                 int[] defs,
                                 int[] uses)
                          throws java.lang.IllegalArgumentException

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

Throws:

java.lang.IllegalArgumentException

toString

public java.lang.String toString(SymbolTable symbolTable)

Specified by:

toString in class SSAInstruction

visit

public void visit(SSAInstruction.IVisitor v)
           throws java.lang.NullPointerException

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

Throws:

java.lang.NullPointerException

hasDef

public boolean hasDef()

Description copied from class: SSAInstruction

Does this instruction define a normal value, as distinct from a set of exceptions possibly thrown by it (e.g. for invoke instructions).

Overrides:

hasDef in class SSAInstruction

Returns:

true if the instruction does define a proper value.

See Also:

SSAInstruction.getDef()

getDef

public int getDef()

Overrides:

getDef in class SSAInstruction

getDef

public int getDef(int i)

Description copied from class: SSAInstruction

Return the ith def

Overrides:

getDef in class SSAInstruction

Parameters:

i - number of the def, starting at 0.

getNumberOfDefs

public int getNumberOfDefs()

Overrides:

getNumberOfDefs in class SSAInstruction

See Also:

SSAInstruction.getNumberOfUses()

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)

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

getOperator

public com.ibm.wala.shrike.shrikeBT.IComparisonInstruction.Operator getOperator()

Returns:

Returns the opcode.