org.apache.flex.abc.semantics

Class InstructionFactory

java.lang.Object

org.apache.flex.abc.semantics.InstructionFactory

public abstract class InstructionFactory
extends Object

The InstructionFactory creates implementation Instruction subclasses for particular types of Instructions, and also handles caching and pooling of shared Instructions.

Constructor Summary

Constructors

Constructor and Description
InstructionFactory()

Method Summary

Methods

Modifier and Type	Method and Description
static Instruction	createModifiedInstruction(int opcode, Instruction original) Copy an instruction's operands as necessary and substitute a new opcode.
static Instruction	getDeferredImmediateInstruction(int opcode)
static Instruction	getHasnext2Instruction()
static Instruction	getInstruction(int opcode)
static Instruction	getInstruction(int opcode, int immediate)
static Instruction	getInstruction(int opcode, Object singleOperand)
static Instruction	getInstruction(int opcode, Object[] operands)
static Instruction	getTargetableInstruction(int opcode)

Methods inherited from class java.lang.Object

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

Constructor Detail

InstructionFactory

public InstructionFactory()

Method Detail

getInstruction

public static final Instruction getInstruction(int opcode)

Returns:

the singleton instance of an instruction with no operands, or a "blank" instruction whose operands are to be filled in.

getInstruction

public static final Instruction getInstruction(int opcode,
                         int immediate)

Returns:

an Instruction with an immediate operand.

getDeferredImmediateInstruction

public static final Instruction getDeferredImmediateInstruction(int opcode)

Returns:

an immediate-operand instruction in cases where the immediate operand is not yet known.

getInstruction

public static final Instruction getInstruction(int opcode,
                         Object singleOperand)

Returns:

an Instruction with a single operand.

getTargetableInstruction

public static final Instruction getTargetableInstruction(int opcode)

Returns:

a single-operand instruction, with the operand TBA.

getInstruction

public static final Instruction getInstruction(int opcode,
                         Object[] operands)

Returns:

an Instruction with an arbitrary number of operands.

getHasnext2Instruction

public static final Instruction getHasnext2Instruction()

Returns:

a hasNext2 instruction.

createModifiedInstruction

public static final Instruction createModifiedInstruction(int opcode,
                                    Instruction original)

Copy an instruction's operands as necessary and substitute a new opcode.

Parameters:

opcode - - the opcode required.

original - - the original instruction.

Returns:

an instruction with the original instruction's operands, whatever they may be, and the specified novel opcode.