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

High-level intermediate representation (HIR) of a JVM instruction.

Field Summary

Fields

Modifier and Type	Field and 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 and Description
protected	NHIRInstruction(NBasicBlock block, int id) Construct an NHIRInstruction object.
protected	NHIRInstruction(NBasicBlock block, int id, String sType, String lType) Construct an NHIRInstruction object.

Method Summary

Methods

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

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 Detail

NHIRInstruction

protected NHIRInstruction(NBasicBlock block,
               int id)

Construct an NHIRInstruction object.

Parameters:

block - enclosing block.

id - identifier of the instruction.

NHIRInstruction

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

Construct an 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 Detail

equals

public boolean equals(NHIRInstruction other)

Return true if this instruction is the same as the other, false otherwise. Two instructions are the same if their ids are the same.

Parameters:

other - the instruction to compare to.

Returns:

true if the instructions are the same, false otherwise.

toLir

public NLIRInstruction toLir()

Convert and return 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:

LIR instruction corresponding to this HIR instruction.

id

public String id()

Return the identifier of this instruction with the short type name prefixed.

Returns:

identifier of this IR instruction with the short type name prefixed.

toString

public String toString()

Return a string representation of this instruction.

Overrides:

toString in class Object

Returns:

string representation of this instruction.