com.techtrader.modules.tools.bytecode
Class StackInstruction

java.lang.Object
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  +--com.techtrader.modules.tools.bytecode.Instruction
        |
        +--com.techtrader.modules.tools.bytecode.StackInstruction

public class StackInstruction

extends Instruction

Represents an instruction that manipulates the stack of the current frame. Using the setType methods is a hint about the type being manipulated that might cause this Instruction to use the wide version of the opcode it represents (if manipulating a long or double). This saves the developer from having to decide at compile time whether to use pop() or pop2(), etc.

Author:

Abe White

Fields inherited from class com.techtrader.modules.tools.bytecode.Instruction

_byteIndex, _opcode, _opcodeTypes, _owner

Constructor Summary

protected

StackInstruction(Code owner, int opcode)

Method Summary

void	acceptVisit(BCVisitor visit) Accept a visit from a BCVisitor, calling the appropriate methods to notify the visitor that it has entered this entity, and to provide it with the proper callbacks for each sub-entity owned by this object.
int	getStackChange() Return the number of stack positions this instruction pushes or pops during its execution.
StackInstruction	setType(Class type) Set the type that is being manipulated; this might cause the instruction to change to the wide version of the opcode it represents.
StackInstruction	setTypeName(String name) Set the type to manipulate by name.

Methods inherited from class com.techtrader.modules.tools.bytecode.Instruction

copy, equals, getByteIndex, getLength, getName, getOpCode, getOwner, invalidate, readData, setByteIndex, setOpCode, writeData

Methods inherited from class java.lang.Object

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

Constructor Detail

StackInstruction

protected StackInstruction(Code owner,
                           int opcode)

Method Detail

setType

public StackInstruction setType(Class type)

Set the type that is being manipulated; this might cause the instruction to change to the wide version of the opcode it represents.

Returns:

this Instruction, for method chaining

setTypeName

public StackInstruction setTypeName(String name)

Set the type to manipulate by name.

Returns:

this Instruction, for method chaining

See Also:

setType(java.lang.Class)

getStackChange

public int getStackChange()

Description copied from class: Instruction

Return the number of stack positions this instruction pushes or pops during its execution.

Overrides:

getStackChange in class Instruction

Tags copied from class: Instruction

Returns:

0 if the stack is not affected by this instruction, a positive number if it pushes onto the stack, and a negative number if it pops from the stack

acceptVisit

public void acceptVisit(BCVisitor visit)

Description copied from interface: VisitAcceptor

Accept a visit from a BCVisitor, calling the appropriate methods to notify the visitor that it has entered this entity, and to provide it with the proper callbacks for each sub-entity owned by this object.

Overrides:

acceptVisit in class Instruction