com.joanju.cg.bytecode
Class DefInstr

java.lang.Object
  com.joanju.cg.bytecode.Bytecode
      com.joanju.cg.bytecode.Assignment
          com.joanju.cg.bytecode.DefInstr

public class DefInstr
extends Assignment

Record of some sort of assignment to an l-value.

Also see PopInstr for values that come out of calls. DefInstr records are used:

• For an assignment, whether the assignment is explicit syntax (lvalue = rvalue), or some other built-in function or syntax which sets a field's value (other than call output - see PopInstr for that).
• For a RUN PERSISTENT SET (var).
• For a DEFINE NEW.

Field Summary

Fields inherited from class com.joanju.cg.bytecode.Assignment

userScriptSourceAddress

Fields inherited from class com.joanju.cg.bytecode.Bytecode

address, cuid, instrSet, nodeNum, xrefs

Constructor Summary

DefInstr()

DefInstr(int cuid, int address)

Method Summary

void	calcValueSets() Calculate the value sets for the instruction.
int	getLVal() Get the address of the var def.
int	getNodeNum() Get the node number for the Field_ref node for a DefInstr record.
Opcode	getOpcode()
int	getRVal() Get the address of the r-value source.
java.util.HashSet<java.lang.Integer>	getValues() Get the set of values for this instruction.
java.util.HashSet<java.lang.Integer>	getWhereUsed() Returns null.
void	setLVal(int addr) Set with the address of the var def.
void	setRVal(int val)
protected void	setValuesFromByteStream(java.io.DataInputStream in)
java.lang.String	toStringFromComments(InstructionSet instrs) All Bytecode instruction subclasses should override this eventually.
java.lang.String	toStringFromData() All Bytecode instruction subclasses should override this eventually.
protected void	writeValuesToByteStream(java.io.DataOutputStream out)

Methods inherited from class com.joanju.cg.bytecode.Assignment

getUserScriptSource, setUserScriptSource

Methods inherited from class com.joanju.cg.bytecode.Bytecode

addSource, addWhereUsed, beforeWrite, calcValuesAgain, compareTo, equals, fetchBytesFromDB, fetchInCu, generateDataForDB, getAddress, getCuID, getSources, getValuesCalcLocal, getXrefs, hashCode, initData, isDataModified, isFromDB, setAddress, setCuID, setDataBytesFromDB, setDataModified, setFromDB, setInstructionSet, setNodeNum, shouldLoadData, sourcesForXrefTarget, storeIfModified, toString, toStringFromName, toStringFromSet

Methods inherited from class java.lang.Object

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

Constructor Detail

DefInstr

public DefInstr()

DefInstr

public DefInstr(int cuid,
                int address)

Method Detail

calcValueSets

public void calcValueSets()
                   throws java.sql.SQLException,
                          java.io.IOException

Description copied from class: Bytecode

Calculate the value sets for the instruction.

Called during build, build-recalc, checkvals, and checkvals-recalc. Implementations should only build from external values once. Calculates which xref records are needed as well.

IMPORTANT: Should only ever be called for instructions belonging to an InstructionSet.

Specified by:

calcValueSets in class Bytecode

Throws:

java.sql.SQLException

java.io.IOException

getLVal

public int getLVal()
            throws java.sql.SQLException,
                   java.io.IOException

Get the address of the var def.

Throws:

java.sql.SQLException

java.io.IOException

getNodeNum

public int getNodeNum()

Get the node number for the Field_ref node for a DefInstr record. See the notes for the DefInstr class for where DefInstr records are used.

Overrides:

getNodeNum in class Bytecode

getOpcode

public Opcode getOpcode()

Specified by:

getOpcode in class Bytecode

getRVal

public int getRVal()
            throws java.sql.SQLException,
                   java.io.IOException

Get the address of the r-value source.

Throws:

java.sql.SQLException

java.io.IOException

getValues

public java.util.HashSet<java.lang.Integer> getValues()
                                               throws java.sql.SQLException,
                                                      java.io.IOException

Description copied from class: Bytecode

Get the set of values for this instruction. Should be overridden by most subclasses. This default implementation returns a set containing one Layout.UNRESOLVED_VALUE.

Overrides:

getValues in class Bytecode

Throws:

java.sql.SQLException

java.io.IOException

getWhereUsed

public java.util.HashSet<java.lang.Integer> getWhereUsed()
                                                  throws java.sql.SQLException,
                                                         java.io.IOException

Description copied from class: Bytecode

Returns null. May be overridden by subclasses.

Overrides:

getWhereUsed in class Bytecode

Throws:

java.sql.SQLException

java.io.IOException

setLVal

public void setLVal(int addr)

Set with the address of the var def.

setRVal

public void setRVal(int val)

setValuesFromByteStream

protected void setValuesFromByteStream(java.io.DataInputStream in)
                                throws java.io.IOException

Specified by:

setValuesFromByteStream in class Bytecode

Throws:

java.io.IOException

toStringFromComments

public java.lang.String toStringFromComments(InstructionSet instrs)

Description copied from class: Bytecode

All Bytecode instruction subclasses should override this eventually.

Overrides:

toStringFromComments in class Bytecode

Returns:

"" if not overridden.

toStringFromData

public java.lang.String toStringFromData()

Description copied from class: Bytecode

All Bytecode instruction subclasses should override this eventually.

Overrides:

toStringFromData in class Bytecode

Returns:

"" if not overridden.

writeValuesToByteStream

protected void writeValuesToByteStream(java.io.DataOutputStream out)
                                throws java.io.IOException

Specified by:

writeValuesToByteStream in class Bytecode

Throws:

java.io.IOException