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## org.apache.bcel.generic
Class InstructionFactory

    java.lang.Object
      |
      +--org.apache.bcel.generic.InstructionFactory

All Implemented Interfaces:
  InstructionConstants, java.io.Serializable

public class InstructionFactory
extends java.lang.Object
implements InstructionConstants, java.io.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,v 1.6 2002/07/11 19:39:04 mdahm Exp $
Author:
  M. Dahm
See Also:
  `Constants`, Serialized Form

Nested Class Summary

Nested classes inherited from class org.apache.bcel.generic.InstructionConstants
`InstructionConstants.Clinit`

Field Summary
`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
`InstructionFactory(ClassGen cg)` Initialize with ClassGen object
`InstructionFactory(ClassGen cg, ConstantPoolGen cp)`
`InstructionFactory(ConstantPoolGen cp)` Initialize just with ConstantPoolGen object

Method Summary
`Instruction` | `createAppend(Type type)`
`static ArrayInstruction` | `createArrayLoad(Type type)`
`static ArrayInstruction` | `createArrayStore(Type type)`
`static ArithmeticInstruction` | `createBinaryOperation(java.lang.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(java.lang.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(java.lang.String class_name, java.lang.String name, Type type, short kind)` Create a field instruction.
`GETFIELD` | `createGetField(java.lang.String class_name, java.lang.String name, Type t)`
`GETSTATIC` | `createGetStatic(java.lang.String class_name, java.lang.String name, Type t)`
`INSTANCEOF` | `createInstanceOf(ReferenceType t)`
`InvokeInstruction` | `createInvoke(java.lang.String class_name, java.lang.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(java.lang.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(java.lang.String s)` Create a call to the most popular System.out.println() method.
`PUTFIELD` | `createPutField(java.lang.String class_name, java.lang.String name, Type t)`
`PUTSTATIC` | `createPutStatic(java.lang.String class_name, java.lang.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(java.lang.String class_name,
                                          java.lang.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(java.lang.String s)

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

  Parameters:
    `s` - the string to print

### createConstant

    public Instruction createConstant(java.lang.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(java.lang.String class_name,
                                              java.lang.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(java.lang.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(java.lang.String class_name,
                                   java.lang.String name,
                                   Type t)

### createGetStatic

    public GETSTATIC createGetStatic(java.lang.String class_name,
                                     java.lang.String name,
                                     Type t)

### createPutField

    public PUTFIELD createPutField(java.lang.String class_name,
                                   java.lang.String name,
                                   Type t)

### createPutStatic

    public PUTSTATIC createPutStatic(java.lang.String class_name,
                                     java.lang.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(java.lang.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()

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