Class SVM_ASSIGN

java.lang.Object

svm.instruction.SVM_Instruction

svm.instruction.SVM_ASSIGN

public class SVM_ASSIGN
extends SVM_Instruction

SVM-INSTRUCTION: ASSIGN and UPDATE

ASSIGN objadr size

Runtime Stack ..., oaddr(?), offset(?), index(?), value1, value2, ... , value'size → ...

UPDATE objadr size

Runtime Stack ..., oaddr(?), offset(?), index(?), value1, value2, ... , value'size → ..., value1, value2, ... , value'size

First, the values are popped off the Runtime stack and remembered.
Then, if the 'objadr.indexed' flag is set, the 'index' is popped off and added to 'objadr'.
Then Force 'objadr' unstacked. Ie. pop off any stacked part and form the resulting address 'resadr'.

The unstacking of the 'objadr' depend on its address kind:

- REMOTE_ADDR: object address 'oaddr' is popped of the Runtime stack.
               resadr := oaddr + objadr.offset
- REFER_ADDR:  'offset' and object address 'oaddr' is popped of the Runtime stack.
               resadr := oaddr + objadr.offset + offset
- Otherwise:   resadr := objadr

Finally, the remembered values are successively stored in address resadr, resadr+1, ... and upwards
and, if UPDATE operation, the values are pushed back onto the Runtime stack.

Link to GitHub: Source File.

Author:

S-Port: Definition of S-code, Øystein Myhre Andersen

Field Summary

Fields

Modifier and Type	Field	Description
private final ObjectAddress	objadr	The target address
private final int	size	The value size
private final boolean	update	true:UPDATE, otherwise ASSIGN instruction

Fields inherited from class SVM_Instruction

iADD, iADDREG, iAND, iASSIGN, iCALL, iCALLSYS, iCOMPARE, iCONVERT, iDECO, iDIST, iDIV, iDUP, iENTER, iEQV, iGETO, iGOTO, iIMP, iINCO, iINITO, iJUMP, iJUMPIF, iLINE, iLOAD, iLOADA, iMax, iMULT, iNEG, iNOOP, iNOT, iOR, iPOPK, iPRECALL, iPUSHC, iPUSHLEN, iPUSHR, iREM, iRESTORE, iRETURN, iSAVE, iSETO, iSHIFT, iSTORE, iSUB, iSWITCH, iXOR, opcode

Constructor Summary

Constructors

Modifier	Constructor	Description
	SVM_ASSIGN(boolean update, ObjectAddress objadr, int size)	Construct a new SVM_ASSIGN instruction
private	SVM_ASSIGN(AttributeInputStream inpt)	Construct an SVM_ASSIGN instruction from the given input.

Method Summary

Modifier and Type	Method	Description
void	execute()	Execute this SVM instruction
static SVM_ASSIGN	read(AttributeInputStream inpt)	Reads an SVM_ASSIGN instruction from the given input.
String	toString()
void	write(AttributeOutputStream oupt)	Write this SVM instruction to the given output.

Methods inherited from class SVM_Instruction

edOpcode, readObject

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Details

update

private final boolean update

true:UPDATE, otherwise ASSIGN instruction

objadr

private final ObjectAddress objadr

The target address

size

private final int size

The value size

Constructor Details

SVM_ASSIGN

public SVM_ASSIGN(boolean update,
 ObjectAddress objadr,
 int size)

Construct a new SVM_ASSIGN instruction

Parameters:

update - true:UPDATE, otherwise ASSIGN instruction

objadr - the target address

size - the value size

SVM_ASSIGN

private SVM_ASSIGN(AttributeInputStream inpt)
            throws IOException

Construct an SVM_ASSIGN instruction from the given input.

Parameters:

inpt - the input stream

Throws:

IOException - if IOException occur

Method Details

execute

public void execute()

Description copied from class: SVM_Instruction

Execute this SVM instruction

Overrides:

execute in class SVM_Instruction

toString

public String toString()

Overrides:

toString in class Object

write

public void write(AttributeOutputStream oupt)
           throws IOException

Description copied from class: SVM_Instruction

Write this SVM instruction to the given output.

Overrides:

write in class SVM_Instruction

Parameters:

oupt - the output stream

Throws:

IOException - if IOException occur

read

public static SVM_ASSIGN read(AttributeInputStream inpt)
                       throws IOException

Reads an SVM_ASSIGN instruction from the given input.

Parameters:

inpt - the input stream

Returns:

the SVM_ASSIGN instruction read

Throws:

IOException - if IOException occur