jminusminus

Class NLIRInstruction

java.lang.Object

jminusminus.NLIRInstruction

Direct Known Subclasses:

NLIRALoad, NLIRArithmetic, NLIRAStore, NLIRConditionalJump, NLIRGetField, NLIRGoto, NLIRIntConstant, NLIRInvoke, NLIRLoad, NLIRLoadLocal, NLIRMove, NLIRNewArray, NLIRPhiFunction, NLIRPutField, NLIRReturn, NLIRStore, NLIRStringConstant

abstract class NLIRInstruction
extends Object

Low-level intermediate representation (LIR) of a JVM instruction.

Field Summary

Fields

Modifier and Type	Field and Description
NBasicBlock	block The block containing this instruction.
int	id Unique identifier of this instruction.
protected static String[]	lirMnemonic Maps JVM opcode to a string mnemonic for LIR instructions.
ArrayList<NRegister>	reads Registers that store the inputs (if any) of this instruction.
NRegister	write Register that stores the result (if any) of this instruction.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	NLIRInstruction(NBasicBlock block, int id) Construct an NLIRInstruction.

Method Summary

Methods

Modifier and Type	Method and Description
void	allocatePhysicalRegisters() Replace references to virtual registers in this LIR instruction with references to physical registers.
void	toSpim(PrintWriter out) Translate this LIR instruction into SPIM and write it out to the specified output stream.
String	toString() Return a string representation of this instruction.

Methods inherited from class java.lang.Object

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

Field Detail

lirMnemonic

protected static String[] lirMnemonic

Maps JVM opcode to a string mnemonic for LIR instructions. For example, imul is mapped to the "MUL".

block

public NBasicBlock block

The block containing this instruction.

id

public int id

Unique identifier of this instruction.

reads

public ArrayList<NRegister> reads

Registers that store the inputs (if any) of this instruction.

write

public NRegister write

Register that stores the result (if any) of this instruction.

Constructor Detail

NLIRInstruction

protected NLIRInstruction(NBasicBlock block,
               int id)

Construct an NLIRInstruction.

Parameters:

block - enclosing block.

id - identifier of the instruction.

Method Detail

allocatePhysicalRegisters

public void allocatePhysicalRegisters()

Replace references to virtual registers in this LIR instruction with references to physical registers.

toSpim

public void toSpim(PrintWriter out)

Translate this LIR instruction into SPIM and write it out to the specified output stream.

Parameters:

out - output stream for SPIM code.

toString

public String toString()

Return a string representation of this instruction.

Overrides:

toString in class Object

Returns:

string representation of this instruction.