org.jikesrvm.compilers.opt.ssa
Class SSADictionary.AllInstructionEnumeration

java.lang.Object
  org.jikesrvm.compilers.opt.ssa.SSADictionary.AllInstructionEnumeration

All Implemented Interfaces:

Enumeration<Instruction>

Enclosing class:

SSADictionary

static final class SSADictionary.AllInstructionEnumeration
extends Object
implements Enumeration<Instruction>

This class implements an Enumeration 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.

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

SSADictionary.AllInstructionEnumeration

SSADictionary.AllInstructionEnumeration(BasicBlock bb,
                                        SSADictionary dict)

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

Parameters:

bb - 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()

Get the next instruction in the enumeration

Specified by:

nextElement in interface Enumeration<Instruction>

Returns:

the next instruction