Package serp.bytecode

Class ClassInstruction

java.lang.Object

serp.bytecode.CodeEntry

serp.bytecode.Instruction

serp.bytecode.TypedInstruction

serp.bytecode.ClassInstruction

All Implemented Interfaces:

BCEntity, VisitAcceptor

Direct Known Subclasses:

MultiANewArrayInstruction

public class ClassInstruction
extends TypedInstruction

An instruction that takes as an argument a class to operate on. Examples include anewarray, checkcast, instance, anew, etc.

Field Summary

Fields

Modifier and Type	Field	Description
private int	_index

Fields inherited from class serp.bytecode.CodeEntry

byteIndex, next, prev

Constructor Summary

Constructors

Constructor	Description
ClassInstruction(Code owner, int opcode)

Method Summary

Modifier and Type	Method	Description
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 one.
boolean	equalsInstruction(Instruction other)	ClassInstructions are equal if the type they reference is the same or unset and if their opcodes are equal.
(package private) int	getLength()	Return the length in bytes of this opcode, including all arguments.
int	getStackChange()	Return the number of stack positions this instruction pushes or pops during its execution.
int	getTypeIndex()	Return the ConstantPool index of the ClassEntry describing the class for this instruction.
java.lang.String	getTypeName()	Return the type name for this instruction.
(package private) void	read(java.io.DataInput in)	Read the arguments for this opcode from the given stream.
(package private) void	read(Instruction other)	Copy the given instruction data.
TypedInstruction	setType(java.lang.String type)	Set the type of this instruction.
ClassInstruction	setTypeIndex(int index)	Set the ConstantPool index of the ClassEntry describing the class for this instruction.
(package private) void	write(java.io.DataOutput out)	Write the arguments for this opcode to the given stream.

Methods inherited from class serp.bytecode.TypedInstruction

getType, getTypeBC, mapType, setType, setType

Methods inherited from class serp.bytecode.Instruction

getByteIndex, getClassLoader, getCode, getLineNumber, getLogicalStackChange, getName, getOpcode, getPool, getProject, invalidate, invalidateByteIndexes, isValid, setOpcode

Methods inherited from class java.lang.Object

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

Field Detail

_index

private int _index

Constructor Detail

ClassInstruction

ClassInstruction(Code owner,
                 int opcode)

Method Detail

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

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

getLength

int getLength()

Description copied from class: Instruction

Return the length in bytes of this opcode, including all arguments. For many opcodes this method relies on an up-to-date byte index.

Overrides:

getLength in class Instruction

getTypeIndex

public int getTypeIndex()

Return the ConstantPool index of the ClassEntry describing the class for this instruction.

setTypeIndex

public ClassInstruction setTypeIndex(int index)

Set the ConstantPool index of the ClassEntry describing the class for this instruction.

Returns:

this instruction, for method chaining

getTypeName

public java.lang.String getTypeName()

Description copied from class: TypedInstruction

Return the type name for this instruction. If the type has not been set, this method will return null.

Specified by:

getTypeName in class TypedInstruction

setType

public TypedInstruction setType(java.lang.String type)

Description copied from class: TypedInstruction

Set the type of this instruction. Types that have no direct support will be converted accordingly.

Specified by:

setType in class TypedInstruction

Returns:

this instruction, for method chaining

equalsInstruction

public boolean equalsInstruction(Instruction other)

ClassInstructions are equal if the type they reference is the same or unset and if their opcodes are equal.

Overrides:

equalsInstruction in class Instruction

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 one.

Specified by:

acceptVisit in interface VisitAcceptor

Overrides:

acceptVisit in class Instruction

read

void read(Instruction other)

Description copied from class: Instruction

Copy the given instruction data.

Overrides:

read in class Instruction

read

void read(java.io.DataInput in)
   throws java.io.IOException

Description copied from class: Instruction

Read the arguments for this opcode from the given stream. This method should be overridden by opcodes that take arguments.

Overrides:

read in class Instruction

Throws:

java.io.IOException

write

void write(java.io.DataOutput out)
    throws java.io.IOException

Description copied from class: Instruction

Write the arguments for this opcode to the given stream. This method should be overridden by opcodes that take arguments.

Overrides:

write in class Instruction

Throws:

java.io.IOException