Class StackInstruction

java.lang.Object

org.apache.bcel.generic.Instruction

org.apache.bcel.generic.StackInstruction

All Implemented Interfaces:

Cloneable

Direct Known Subclasses:

DUP, DUP_X1, DUP_X2, DUP2, DUP2_X1, DUP2_X2, POP, POP2, SWAP

public abstract class StackInstruction
extends Instruction

Superclass for stack operations like DUP and POP.

Field Summary

Fields inherited from class Instruction

length, opcode

Modifier and Type	Field	Description
protected short	length	Deprecated. (since 6.0) will be made private; do not access directly, use getter/setter
protected short	opcode	Deprecated. (since 6.0) will be made private; do not access directly, use getter/setter

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	StackInstruction(short opcode)	Constructs a StackInstruction.

Method Summary

Modifier and Type	Method	Description
Type	getType(ConstantPoolGen cp)	Gets the type.

Methods inherited from class Instruction

accept, consumeStack, copy, dump, equals, getComparator, getLength, getName, getOpcode, hashCode, initFromFile, isValidByte, isValidShort, produceStack, readInstruction, setComparator, toString, toString, toString

Modifier and Type	Method	Description
abstract void	accept(Visitor v)	Call corresponding visitor method(s).
int	consumeStack(ConstantPoolGen cpg)	This method also gives right results for instructions whose effect on the stack depends on the constant pool entry they reference.
Instruction	copy()	Use with caution, since 'BranchInstruction's have a 'target' reference which is not copied correctly (only basic types are).
void	dump(DataOutputStream out)	Dumps instruction as byte code to stream out.
boolean	equals(Object that)	Tests for equality, delegated to comparator
static InstructionComparator	getComparator()	Deprecated. (6.0) use the built in comparator, or wrap this class in another object that implements these methods
int	getLength()	Gets the length (in bytes) of instruction.
String	getName()	Gets the name of instruction, that is, opcode name.
short	getOpcode()	Gets this instruction's opcode.
int	hashCode()	Gets the hashCode of this object.
protected void	initFromFile(ByteSequence bytes, boolean wide)	Reads needed data (for example index) from file.
static boolean	isValidByte(int value)	Tests if the value can fit in a byte (signed).
static boolean	isValidShort(int value)	Tests if the value can fit in a short (signed).
int	produceStack(ConstantPoolGen cpg)	This method also gives right results for instructions whose effect on the stack depends on the constant pool entry they reference.
static Instruction	readInstruction(ByteSequence bytes)	Reads an instruction from (byte code) input stream and return the appropriate object.
static void	setComparator(InstructionComparator c)	Deprecated. (6.0) use the built in comparator, or wrap this class in another object that implements these methods
String	toString()
String	toString(boolean verbose)	Long output format: <name of opcode> "["<opcode number>"]" "("<length of instruction>")"
String	toString(ConstantPool cp)	Gets the mnemonic for instruction with symbolic references resolved.

Methods inherited from class Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Details

StackInstruction

protected StackInstruction(short opcode)

Constructs a StackInstruction.

Parameters:

opcode - instruction opcode.

Method Details

getType

public Type getType(ConstantPoolGen cp)

Gets the type.

Parameters:

cp - The constant pool.

Returns:

Type.UNKNOWN.