Package jminusminus

Class NHIRInstruction

java.lang.Object

jminusminus.NHIRInstruction

Direct Known Subclasses:

NHIRALoad, NHIRArithmetic, NHIRAStore, NHIRConditionalJump, NHIRGetField, NHIRGoto, NHIRIntConstant, NHIRInvoke, NHIRLoadLocal, NHIRLocal, NHIRNewArray, NHIRPhiFunction, NHIRPutField, NHIRReturn, NHIRStringConstant

abstract class NHIRInstruction
extends Object

This abstract base class provides a high-level intermediate representation (HIR) of a JVM instruction.

Field Summary

Fields

Modifier and Type	Field	Description
NBasicBlock	block	The block containing this instruction.
protected static String[]	hirMnemonic	Maps JVM opcode to a string mnemonic for HIR instructions.
int	id	Unique identifier of this instruction.
NLIRInstruction	lir	The LIR instruction corresponding to this HIR instruction.
String	lType	Long type name for this instruction.
String	sType	Short type name for this instruction.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	NHIRInstruction(NBasicBlock block, int id)	Constructs a NHIRInstruction object.
protected	NHIRInstruction(NBasicBlock block, int id, String sType, String lType)	Constructs a NHIRInstruction object.

Method Summary

Modifier and Type	Method	Description
boolean	equals(NHIRInstruction other)	Returns true if this instruction is the same as the other, and false otherwise.
String	id()	Returns the identifier of this instruction with the short type name prefix.
NLIRInstruction	toLir()	Converts and returns a low-level representation (LIR) of this HIR instruction.
String	toString()	Returns a string representation of this instruction.

Methods inherited from class java.lang.Object

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

Field Details

hirMnemonic

protected static String[] hirMnemonic

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

block

public NBasicBlock block

The block containing this instruction.

id

public int id

Unique identifier of this instruction.

sType

public String sType

Short type name for this instruction.

lType

public String lType

Long type name for this instruction.

lir

public NLIRInstruction lir

The LIR instruction corresponding to this HIR instruction.

Constructor Details

NHIRInstruction

protected NHIRInstruction(NBasicBlock block,
 int id)

Constructs a NHIRInstruction object.

Parameters:

block - enclosing block.

id - identifier of the instruction.

NHIRInstruction

protected NHIRInstruction(NBasicBlock block,
 int id,
 String sType,
 String lType)

Constructs a NHIRInstruction object.

Parameters:

block - enclosing block.

id - identifier of the instruction.

sType - short type name of the instruction.

lType - long type name of the instruction.

Method Details

equals

public boolean equals(NHIRInstruction other)

Returns true if this instruction is the same as the other, and false otherwise.

Parameters:

other - the instruction to compare to.

Returns:

true if this instruction is the same as the other, and false otherwise.

toLir

public NLIRInstruction toLir()

Converts and returns a low-level representation (LIR) of this HIR instruction. Also adds the returned LIR instruction to the list of LIR instructions for the block containing this instruction, along with any other intermediate LIR instructions needed.

Returns:

the LIR instruction corresponding to this HIR instruction.

id

public String id()

Returns the identifier of this instruction with the short type name prefix.

Returns:

the identifier of this instruction with the short type name prefix.

toString

public String toString()

Returns a string representation of this instruction.

Overrides:

toString in class Object

Returns:

a string representation of this instruction.