org.apache.bcel.generic

Class InstructionFactory

java.lang.Object

org.apache.bcel.generic.InstructionFactory

All Implemented Interfaces:

Serializable, InstructionConstants

public class InstructionFactory
extends Object
implements InstructionConstants, Serializable

Instances of this class may be used, e.g., to generate typed versions of instructions. Its main purpose is to be used as the byte code generating backend of a compiler. You can subclass it to add your own create methods.

Version:

$Id: InstructionFactory.java 386056 2006-03-15 11:31:56Z tcurdt $

Author:

M. Dahm

See Also:

Constants, Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.bcel.generic.InstructionConstants

InstructionConstants.Clinit

Field Summary

Fields

Modifier and Type	Field and Description
protected ClassGen	cg
protected ConstantPoolGen	cp

Fields inherited from interface org.apache.bcel.generic.InstructionConstants

AALOAD, AASTORE, ACONST_NULL, ALOAD_0, ALOAD_1, ALOAD_2, ARETURN, ARRAYLENGTH, ASTORE_0, ASTORE_1, ASTORE_2, ATHROW, BALOAD, BASTORE, bla, CALOAD, CASTORE, D2F, D2I, D2L, DADD, DALOAD, DASTORE, DCMPG, DCMPL, DCONST_0, DCONST_1, DDIV, DMUL, DNEG, DREM, DRETURN, DSUB, DUP, DUP_X1, DUP_X2, DUP2, DUP2_X1, DUP2_X2, F2D, F2I, F2L, FADD, FALOAD, FASTORE, FCMPG, FCMPL, FCONST_0, FCONST_1, FCONST_2, FDIV, FMUL, FNEG, FREM, FRETURN, FSUB, I2B, I2C, I2D, I2F, I2L, I2S, IADD, IALOAD, IAND, IASTORE, ICONST_0, ICONST_1, ICONST_2, ICONST_3, ICONST_4, ICONST_5, ICONST_M1, IDIV, ILOAD_0, ILOAD_1, ILOAD_2, IMUL, INEG, INSTRUCTIONS, IOR, IREM, IRETURN, ISHL, ISHR, ISTORE_0, ISTORE_1, ISTORE_2, ISUB, IUSHR, IXOR, L2D, L2F, L2I, LADD, LALOAD, LAND, LASTORE, LCMP, LCONST_0, LCONST_1, LDIV, LMUL, LNEG, LOR, LREM, LRETURN, LSHL, LSHR, LSUB, LUSHR, LXOR, MONITORENTER, MONITOREXIT, NOP, POP, POP2, RETURN, SALOAD, SASTORE, SWAP, THIS

Constructor Summary

Constructors

Constructor and Description
InstructionFactory(ClassGen cg) Initialize with ClassGen object
InstructionFactory(ClassGen cg, ConstantPoolGen cp)
InstructionFactory(ConstantPoolGen cp) Initialize just with ConstantPoolGen object

Method Summary

Methods

Modifier and Type	Method and Description
Instruction	createAppend(Type type)
static ArrayInstruction	createArrayLoad(Type type)
static ArrayInstruction	createArrayStore(Type type)
static ArithmeticInstruction	createBinaryOperation(String op, Type type) Create binary operation for simple basic types, such as int and float.
static BranchInstruction	createBranchInstruction(short opcode, InstructionHandle target) Create branch instruction by given opcode, except LOOKUPSWITCH and TABLESWITCH.
Instruction	createCast(Type src_type, Type dest_type) Create conversion operation for two stack operands, this may be an I2C, instruction, e.g., if the operands are basic types and CHECKCAST if they are reference types.
CHECKCAST	createCheckCast(ReferenceType t)
Instruction	createConstant(Object value) Uses PUSH to push a constant value onto the stack.
static StackInstruction	createDup_1(int size)
static StackInstruction	createDup_2(int size)
static StackInstruction	createDup(int size)
FieldInstruction	createFieldAccess(String class_name, String name, Type type, short kind) Create a field instruction.
GETFIELD	createGetField(String class_name, String name, Type t)
GETSTATIC	createGetStatic(String class_name, String name, Type t)
INSTANCEOF	createInstanceOf(ReferenceType t)
InvokeInstruction	createInvoke(String class_name, String name, Type ret_type, Type[] arg_types, short kind) Create an invoke instruction.
static LocalVariableInstruction	createLoad(Type type, int index)
NEW	createNew(ObjectType t)
NEW	createNew(String s)
Instruction	createNewArray(Type t, short dim) Create new array of given size and type.
static Instruction	createNull(Type type) Create "null" value for reference types, 0 for basic types like int
static StackInstruction	createPop(int size)
InstructionList	createPrintln(String s) Create a call to the most popular System.out.println() method.
PUTFIELD	createPutField(String class_name, String name, Type t)
PUTSTATIC	createPutStatic(String class_name, String name, Type t)
static ReturnInstruction	createReturn(Type type) Create typed return
static LocalVariableInstruction	createStore(Type type, int index)
static Instruction	createThis() Create reference to `this'
ClassGen	getClassGen()
ConstantPoolGen	getConstantPool()
void	setClassGen(ClassGen c)
void	setConstantPool(ConstantPoolGen c)

Methods inherited from class java.lang.Object

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

Field Detail

cg

protected ClassGen cg

cp

protected ConstantPoolGen cp

Constructor Detail

InstructionFactory

public InstructionFactory(ClassGen cg,
                  ConstantPoolGen cp)

InstructionFactory

public InstructionFactory(ClassGen cg)

Initialize with ClassGen object

InstructionFactory

public InstructionFactory(ConstantPoolGen cp)

Initialize just with ConstantPoolGen object

Method Detail

createInvoke

public InvokeInstruction createInvoke(String class_name,
                             String name,
                             Type ret_type,
                             Type[] arg_types,
                             short kind)

Create an invoke instruction.

Parameters:

class_name - name of the called class

name - name of the called method

ret_type - return type of method

arg_types - argument types of method

kind - how to invoke, i.e., INVOKEINTERFACE, INVOKESTATIC, INVOKEVIRTUAL, or INVOKESPECIAL

See Also:

Constants

createPrintln

public InstructionList createPrintln(String s)

Create a call to the most popular System.out.println() method.

Parameters:

s - the string to print

createConstant

public Instruction createConstant(Object value)

Uses PUSH to push a constant value onto the stack.

Parameters:

value - must be of type Number, Boolean, Character or String

createAppend

public Instruction createAppend(Type type)

createFieldAccess

public FieldInstruction createFieldAccess(String class_name,
                                 String name,
                                 Type type,
                                 short kind)

Create a field instruction.

Parameters:

class_name - name of the accessed class

name - name of the referenced field

type - type of field

kind - how to access, i.e., GETFIELD, PUTFIELD, GETSTATIC, PUTSTATIC

See Also:

Constants

createThis

public static Instruction createThis()

Create reference to `this'

createReturn

public static ReturnInstruction createReturn(Type type)

Create typed return

createBinaryOperation

public static ArithmeticInstruction createBinaryOperation(String op,
                                          Type type)

Create binary operation for simple basic types, such as int and float.

Parameters:

op - operation, such as "+", "*", "<<", etc.

createPop

public static StackInstruction createPop(int size)

Parameters:

size - size of operand, either 1 (int, e.g.) or 2 (double)

createDup

public static StackInstruction createDup(int size)

Parameters:

size - size of operand, either 1 (int, e.g.) or 2 (double)

createDup_2

public static StackInstruction createDup_2(int size)

Parameters:

size - size of operand, either 1 (int, e.g.) or 2 (double)

createDup_1

public static StackInstruction createDup_1(int size)

Parameters:

size - size of operand, either 1 (int, e.g.) or 2 (double)

createStore

public static LocalVariableInstruction createStore(Type type,
                                   int index)

Parameters:

index - index of local variable

createLoad

public static LocalVariableInstruction createLoad(Type type,
                                  int index)

Parameters:

index - index of local variable

createArrayLoad

public static ArrayInstruction createArrayLoad(Type type)

Parameters:

type - type of elements of array, i.e., array.getElementType()

createArrayStore

public static ArrayInstruction createArrayStore(Type type)

Parameters:

type - type of elements of array, i.e., array.getElementType()

createCast

public Instruction createCast(Type src_type,
                     Type dest_type)

Create conversion operation for two stack operands, this may be an I2C, instruction, e.g., if the operands are basic types and CHECKCAST if they are reference types.

createGetField

public GETFIELD createGetField(String class_name,
                      String name,
                      Type t)

createGetStatic

public GETSTATIC createGetStatic(String class_name,
                        String name,
                        Type t)

createPutField

public PUTFIELD createPutField(String class_name,
                      String name,
                      Type t)

createPutStatic

public PUTSTATIC createPutStatic(String class_name,
                        String name,
                        Type t)

createCheckCast

public CHECKCAST createCheckCast(ReferenceType t)

createInstanceOf

public INSTANCEOF createInstanceOf(ReferenceType t)

createNew

public NEW createNew(ObjectType t)

createNew

public NEW createNew(String s)

createNewArray

public Instruction createNewArray(Type t,
                         short dim)

Create new array of given size and type.

Returns:

an instruction that creates the corresponding array at runtime, i.e. is an AllocationInstruction

createNull

public static Instruction createNull(Type type)

Create "null" value for reference types, 0 for basic types like int

createBranchInstruction

public static BranchInstruction createBranchInstruction(short opcode,
                                        InstructionHandle target)

Create branch instruction by given opcode, except LOOKUPSWITCH and TABLESWITCH. For those you should use the SWITCH compound instruction.

setClassGen

public void setClassGen(ClassGen c)

getClassGen

public ClassGen getClassGen()

setConstantPool

public void setConstantPool(ConstantPoolGen c)

getConstantPool

public ConstantPoolGen getConstantPool()