org.jikesrvm.compilers.opt.ir

Class IREnumeration.AllInstructionsEnum

java.lang.Object

org.jikesrvm.compilers.opt.ir.IREnumeration.AllInstructionsEnum

All Implemented Interfaces:

Enumeration<Instruction>

Enclosing class:

IREnumeration

public static final class IREnumeration.AllInstructionsEnum
extends Object
implements Enumeration<Instruction>

This class implements an enumeration of instructions over all instructions for a basic block. This enumeration includes explicit instructions in the IR and implicit phi instructions for heap variables, which are stored only in this lookaside structure.

See Also:

SSADictionary

Field Summary

Fields

Modifier and Type	Field and Description
private Enumeration<Instruction>	explicitInstructions An enumeration of the explicit instructions in the IR for a basic block
private Iterator<Instruction>	implicitInstructions An enumeration of the implicit instructions in the IR for a basic block.
private Instruction	labelInstruction The label instruction for the basic block - the label is special as we want it to appear in the enumeration before the implicit SSA instructions

Constructor Summary

Constructors

Constructor and Description
AllInstructionsEnum(IR ir, BasicBlock block) Construct an enumeration for all instructions, both implicit and explicit in the IR, for a given basic block

Method Summary

Modifier and Type	Method and Description
boolean	hasMoreElements() Are there more elements in the enumeration?
Instruction	nextElement()

Methods inherited from class java.lang.Object

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

Field Detail

explicitInstructions

private final Enumeration<Instruction> explicitInstructions

An enumeration of the explicit instructions in the IR for a basic block

implicitInstructions

private final Iterator<Instruction> implicitInstructions

An enumeration of the implicit instructions in the IR for a basic block. These instructions appear only in the SSA dictionary lookaside structure.

labelInstruction

private Instruction labelInstruction

The label instruction for the basic block - the label is special as we want it to appear in the enumeration before the implicit SSA instructions

Constructor Detail

AllInstructionsEnum

public AllInstructionsEnum(IR ir,
                           BasicBlock block)

Construct an enumeration for all instructions, both implicit and explicit in the IR, for a given basic block

Parameters:

ir - the containing IR

block - the basic block whose instructions this enumerates

Method Detail

hasMoreElements

public boolean hasMoreElements()

Are there more elements in the enumeration?

Specified by:

hasMoreElements in interface Enumeration<Instruction>

Returns:

true or false

nextElement

public Instruction nextElement()

Specified by:

nextElement in interface Enumeration<Instruction>