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

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

IREnumeration.AllInstructionsEnum

public IREnumeration.AllInstructionsEnum(IR ir,
                                         BasicBlock block)

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

Parameters:

block - the basic block whose instructions this enumerates

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>