java.lang.Object
- proguard.classfile.instruction.Instruction

Direct Known Subclasses:

BranchInstruction, CodeAttributeEditor.Label, ConstantInstruction, InstructionSequenceReplacer.Label, SimpleInstruction, SwitchInstruction, VariableInstruction
```
public abstract class Instruction
extends java.lang.Object
```
Base class for representing instructions.

Field Summary

Fields
Modifier and Type	Field	Description
`static byte`	`ARRAY_T_BOOLEAN`
`static byte`	`ARRAY_T_BYTE`
`static byte`	`ARRAY_T_CHAR`
`static byte`	`ARRAY_T_DOUBLE`
`static byte`	`ARRAY_T_FLOAT`
`static byte`	`ARRAY_T_INT`
`static byte`	`ARRAY_T_LONG`
`static byte`	`ARRAY_T_SHORT`
`static java.lang.String[]`	`NAMES`
`static byte`	`OP_AALOAD`
`static byte`	`OP_AASTORE`
`static byte`	`OP_ACONST_NULL`
`static byte`	`OP_ALOAD`
`static byte`	`OP_ALOAD_0`
`static byte`	`OP_ALOAD_1`
`static byte`	`OP_ALOAD_2`
`static byte`	`OP_ALOAD_3`
`static byte`	`OP_ANEWARRAY`
`static byte`	`OP_ARETURN`
`static byte`	`OP_ARRAYLENGTH`
`static byte`	`OP_ASTORE`
`static byte`	`OP_ASTORE_0`
`static byte`	`OP_ASTORE_1`
`static byte`	`OP_ASTORE_2`
`static byte`	`OP_ASTORE_3`
`static byte`	`OP_ATHROW`
`static byte`	`OP_BALOAD`
`static byte`	`OP_BASTORE`
`static byte`	`OP_BIPUSH`
`static byte`	`OP_CALOAD`
`static byte`	`OP_CASTORE`
`static byte`	`OP_CHECKCAST`
`static byte`	`OP_D2F`
`static byte`	`OP_D2I`
`static byte`	`OP_D2L`
`static byte`	`OP_DADD`
`static byte`	`OP_DALOAD`
`static byte`	`OP_DASTORE`
`static byte`	`OP_DCMPG`
`static byte`	`OP_DCMPL`
`static byte`	`OP_DCONST_0`
`static byte`	`OP_DCONST_1`
`static byte`	`OP_DDIV`
`static byte`	`OP_DLOAD`
`static byte`	`OP_DLOAD_0`
`static byte`	`OP_DLOAD_1`
`static byte`	`OP_DLOAD_2`
`static byte`	`OP_DLOAD_3`
`static byte`	`OP_DMUL`
`static byte`	`OP_DNEG`
`static byte`	`OP_DREM`
`static byte`	`OP_DRETURN`
`static byte`	`OP_DSTORE`
`static byte`	`OP_DSTORE_0`
`static byte`	`OP_DSTORE_1`
`static byte`	`OP_DSTORE_2`
`static byte`	`OP_DSTORE_3`
`static byte`	`OP_DSUB`
`static byte`	`OP_DUP`
`static byte`	`OP_DUP_X1`
`static byte`	`OP_DUP_X2`
`static byte`	`OP_DUP2`
`static byte`	`OP_DUP2_X1`
`static byte`	`OP_DUP2_X2`
`static byte`	`OP_F2D`
`static byte`	`OP_F2I`
`static byte`	`OP_F2L`
`static byte`	`OP_FADD`
`static byte`	`OP_FALOAD`
`static byte`	`OP_FASTORE`
`static byte`	`OP_FCMPG`
`static byte`	`OP_FCMPL`
`static byte`	`OP_FCONST_0`
`static byte`	`OP_FCONST_1`
`static byte`	`OP_FCONST_2`
`static byte`	`OP_FDIV`
`static byte`	`OP_FLOAD`
`static byte`	`OP_FLOAD_0`
`static byte`	`OP_FLOAD_1`
`static byte`	`OP_FLOAD_2`
`static byte`	`OP_FLOAD_3`
`static byte`	`OP_FMUL`
`static byte`	`OP_FNEG`
`static byte`	`OP_FREM`
`static byte`	`OP_FRETURN`
`static byte`	`OP_FSTORE`
`static byte`	`OP_FSTORE_0`
`static byte`	`OP_FSTORE_1`
`static byte`	`OP_FSTORE_2`
`static byte`	`OP_FSTORE_3`
`static byte`	`OP_FSUB`
`static byte`	`OP_GETFIELD`
`static byte`	`OP_GETSTATIC`
`static byte`	`OP_GOTO`
`static byte`	`OP_GOTO_W`
`static byte`	`OP_I2B`
`static byte`	`OP_I2C`
`static byte`	`OP_I2D`
`static byte`	`OP_I2F`
`static byte`	`OP_I2L`
`static byte`	`OP_I2S`
`static byte`	`OP_IADD`
`static byte`	`OP_IALOAD`
`static byte`	`OP_IAND`
`static byte`	`OP_IASTORE`
`static byte`	`OP_ICONST_0`
`static byte`	`OP_ICONST_1`
`static byte`	`OP_ICONST_2`
`static byte`	`OP_ICONST_3`
`static byte`	`OP_ICONST_4`
`static byte`	`OP_ICONST_5`
`static byte`	`OP_ICONST_M1`
`static byte`	`OP_IDIV`
`static byte`	`OP_IFACMPEQ`
`static byte`	`OP_IFACMPNE`
`static byte`	`OP_IFEQ`
`static byte`	`OP_IFGE`
`static byte`	`OP_IFGT`
`static byte`	`OP_IFICMPEQ`
`static byte`	`OP_IFICMPGE`
`static byte`	`OP_IFICMPGT`
`static byte`	`OP_IFICMPLE`
`static byte`	`OP_IFICMPLT`
`static byte`	`OP_IFICMPNE`
`static byte`	`OP_IFLE`
`static byte`	`OP_IFLT`
`static byte`	`OP_IFNE`
`static byte`	`OP_IFNONNULL`
`static byte`	`OP_IFNULL`
`static byte`	`OP_IINC`
`static byte`	`OP_ILOAD`
`static byte`	`OP_ILOAD_0`
`static byte`	`OP_ILOAD_1`
`static byte`	`OP_ILOAD_2`
`static byte`	`OP_ILOAD_3`
`static byte`	`OP_IMUL`
`static byte`	`OP_INEG`
`static byte`	`OP_INSTANCEOF`
`static byte`	`OP_INVOKEDYNAMIC`
`static byte`	`OP_INVOKEINTERFACE`
`static byte`	`OP_INVOKESPECIAL`
`static byte`	`OP_INVOKESTATIC`
`static byte`	`OP_INVOKEVIRTUAL`
`static byte`	`OP_IOR`
`static byte`	`OP_IREM`
`static byte`	`OP_IRETURN`
`static byte`	`OP_ISHL`
`static byte`	`OP_ISHR`
`static byte`	`OP_ISTORE`
`static byte`	`OP_ISTORE_0`
`static byte`	`OP_ISTORE_1`
`static byte`	`OP_ISTORE_2`
`static byte`	`OP_ISTORE_3`
`static byte`	`OP_ISUB`
`static byte`	`OP_IUSHR`
`static byte`	`OP_IXOR`
`static byte`	`OP_JSR`
`static byte`	`OP_JSR_W`
`static byte`	`OP_L2D`
`static byte`	`OP_L2F`
`static byte`	`OP_L2I`
`static byte`	`OP_LADD`
`static byte`	`OP_LALOAD`
`static byte`	`OP_LAND`
`static byte`	`OP_LASTORE`
`static byte`	`OP_LCMP`
`static byte`	`OP_LCONST_0`
`static byte`	`OP_LCONST_1`
`static byte`	`OP_LDC`
`static byte`	`OP_LDC_W`
`static byte`	`OP_LDC2_W`
`static byte`	`OP_LDIV`
`static byte`	`OP_LLOAD`
`static byte`	`OP_LLOAD_0`
`static byte`	`OP_LLOAD_1`
`static byte`	`OP_LLOAD_2`
`static byte`	`OP_LLOAD_3`
`static byte`	`OP_LMUL`
`static byte`	`OP_LNEG`
`static byte`	`OP_LOOKUPSWITCH`
`static byte`	`OP_LOR`
`static byte`	`OP_LREM`
`static byte`	`OP_LRETURN`
`static byte`	`OP_LSHL`
`static byte`	`OP_LSHR`
`static byte`	`OP_LSTORE`
`static byte`	`OP_LSTORE_0`
`static byte`	`OP_LSTORE_1`
`static byte`	`OP_LSTORE_2`
`static byte`	`OP_LSTORE_3`
`static byte`	`OP_LSUB`
`static byte`	`OP_LUSHR`
`static byte`	`OP_LXOR`
`static byte`	`OP_MONITORENTER`
`static byte`	`OP_MONITOREXIT`
`static byte`	`OP_MULTIANEWARRAY`
`static byte`	`OP_NEW`
`static byte`	`OP_NEWARRAY`
`static byte`	`OP_NOP`
`static byte`	`OP_POP`
`static byte`	`OP_POP2`
`static byte`	`OP_PUTFIELD`
`static byte`	`OP_PUTSTATIC`
`static byte`	`OP_RET`
`static byte`	`OP_RETURN`
`static byte`	`OP_SALOAD`
`static byte`	`OP_SASTORE`
`static byte`	`OP_SIPUSH`
`static byte`	`OP_SWAP`
`static byte`	`OP_TABLESWITCH`
`static byte`	`OP_WIDE`
`byte`	`opcode`

Constructor Summary

Constructors
Constructor Description

Instruction()

Method Summary

All Methods Static Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`abstract void`	`accept(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, InstructionVisitor instructionVisitor)`	Accepts the given visitor.
`byte`	`actualOpcode()`	Returns the actual opcode of this instruction, i.e.
`byte`	`canonicalOpcode()`	Returns the canonical opcode of this instruction, i.e.
`abstract boolean`	`equals(java.lang.Object o)`
`java.lang.String`	`getName()`	Returns the name of the instruction.
`abstract int`	`hashCode()`
`boolean`	`isCategory2()`	Returns whether the instruction is a Category 2 instruction.
`protected boolean`	`isWide()`	Returns whether the instruction is wide, i.e.
`abstract int`	`length(int offset)`	Returns the length in bytes of the instruction.
`boolean`	`mayInstanceThrowExceptions(Clazz clazz)`	Returns whether a particular instance of an instruction may throw exceptions.
`boolean`	`mayThrowExceptions()`	Returns whether the instruction may conservatively throw exceptions.
`protected static int`	`readByte(byte[] code, int offset)`
`protected abstract void`	`readInfo(byte[] code, int offset)`	Reads the data following the instruction opcode.
`protected static int`	`readInt(byte[] code, int offset)`
`protected static int`	`readShort(byte[] code, int offset)`
`protected static int`	`readSignedByte(byte[] code, int offset)`
`protected static int`	`readSignedShort(byte[] code, int offset)`
`protected static int`	`readSignedValue(byte[] code, int offset, int valueSize)`
`protected static int`	`readValue(byte[] code, int offset, int valueSize)`
`abstract Instruction`	`shrink()`	Shrinks this instruction to its shortest possible form.
`int`	`stackEntryIndexBefore(Clazz clazz, int stackEntryIndexAfter)`	Returns the stack entry index from which the specified stack entry is copied by a dup/swap/checkcast instruction, or -1 otherwise.
`int`	`stackPopCount(Clazz clazz)`	Returns the number of entries popped from the stack during the execution of the instruction.
`int`	`stackPushCount(Clazz clazz)`	Returns the number of entries pushed onto the stack during the execution of the instruction.
`java.lang.String`	`toString(int offset)`	Returns a description of the instruction, at the given offset.
`java.lang.String`	`toString(Clazz clazz, int offset)`	Returns a description of the instruction, at the given offset.
`void`	`write(byte[] code, int offset)`	Writes the Instruction at the given offset in the given code array.
`void`	`write(CodeAttribute codeAttribute, int offset)`	Writes the Instruction at the given offset in the given code attribute.
`protected static void`	`writeByte(byte[] code, int offset, int value)`
`protected abstract void`	`writeInfo(byte[] code, int offset)`	Writes data following the instruction opcode.
`protected static void`	`writeInt(byte[] code, int offset, int value)`
`protected static void`	`writeShort(byte[] code, int offset, int value)`
`protected static void`	`writeSignedByte(byte[] code, int offset, int value)`
`protected static void`	`writeSignedShort(byte[] code, int offset, int value)`
`protected static void`	`writeSignedValue(byte[] code, int offset, int value, int valueSize)`
`protected static void`	`writeValue(byte[] code, int offset, int value, int valueSize)`

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Field Detail
- OP_NOP
```
public static final byte OP_NOP
```
  See Also:
  
  Constant Field Values
- OP_ACONST_NULL
```
public static final byte OP_ACONST_NULL
```
  See Also:
  
  Constant Field Values
- OP_ICONST_M1
```
public static final byte OP_ICONST_M1
```
  See Also:
  
  Constant Field Values
- OP_ICONST_0
```
public static final byte OP_ICONST_0
```
  See Also:
  
  Constant Field Values
- OP_ICONST_1
```
public static final byte OP_ICONST_1
```
  See Also:
  
  Constant Field Values
- OP_ICONST_2
```
public static final byte OP_ICONST_2
```
  See Also:
  
  Constant Field Values
- OP_ICONST_3
```
public static final byte OP_ICONST_3
```
  See Also:
  
  Constant Field Values
- OP_ICONST_4
```
public static final byte OP_ICONST_4
```
  See Also:
  
  Constant Field Values
- OP_ICONST_5
```
public static final byte OP_ICONST_5
```
  See Also:
  
  Constant Field Values
- OP_LCONST_0
```
public static final byte OP_LCONST_0
```
  See Also:
  
  Constant Field Values
- OP_LCONST_1
```
public static final byte OP_LCONST_1
```
  See Also:
  
  Constant Field Values
- OP_FCONST_0
```
public static final byte OP_FCONST_0
```
  See Also:
  
  Constant Field Values
- OP_FCONST_1
```
public static final byte OP_FCONST_1
```
  See Also:
  
  Constant Field Values
- OP_FCONST_2
```
public static final byte OP_FCONST_2
```
  See Also:
  
  Constant Field Values
- OP_DCONST_0
```
public static final byte OP_DCONST_0
```
  See Also:
  
  Constant Field Values
- OP_DCONST_1
```
public static final byte OP_DCONST_1
```
  See Also:
  
  Constant Field Values
- OP_BIPUSH
```
public static final byte OP_BIPUSH
```
  See Also:
  
  Constant Field Values
- OP_SIPUSH
```
public static final byte OP_SIPUSH
```
  See Also:
  
  Constant Field Values
- OP_LDC
```
public static final byte OP_LDC
```
  See Also:
  
  Constant Field Values
- OP_LDC_W
```
public static final byte OP_LDC_W
```
  See Also:
  
  Constant Field Values
- OP_LDC2_W
```
public static final byte OP_LDC2_W
```
  See Also:
  
  Constant Field Values
- OP_ILOAD
```
public static final byte OP_ILOAD
```
  See Also:
  
  Constant Field Values
- OP_LLOAD
```
public static final byte OP_LLOAD
```
  See Also:
  
  Constant Field Values
- OP_FLOAD
```
public static final byte OP_FLOAD
```
  See Also:
  
  Constant Field Values
- OP_DLOAD
```
public static final byte OP_DLOAD
```
  See Also:
  
  Constant Field Values
- OP_ALOAD
```
public static final byte OP_ALOAD
```
  See Also:
  
  Constant Field Values
- OP_ILOAD_0
```
public static final byte OP_ILOAD_0
```
  See Also:
  
  Constant Field Values
- OP_ILOAD_1
```
public static final byte OP_ILOAD_1
```
  See Also:
  
  Constant Field Values
- OP_ILOAD_2
```
public static final byte OP_ILOAD_2
```
  See Also:
  
  Constant Field Values
- OP_ILOAD_3
```
public static final byte OP_ILOAD_3
```
  See Also:
  
  Constant Field Values
- OP_LLOAD_0
```
public static final byte OP_LLOAD_0
```
  See Also:
  
  Constant Field Values
- OP_LLOAD_1
```
public static final byte OP_LLOAD_1
```
  See Also:
  
  Constant Field Values
- OP_LLOAD_2
```
public static final byte OP_LLOAD_2
```
  See Also:
  
  Constant Field Values
- OP_LLOAD_3
```
public static final byte OP_LLOAD_3
```
  See Also:
  
  Constant Field Values
- OP_FLOAD_0
```
public static final byte OP_FLOAD_0
```
  See Also:
  
  Constant Field Values
- OP_FLOAD_1
```
public static final byte OP_FLOAD_1
```
  See Also:
  
  Constant Field Values
- OP_FLOAD_2
```
public static final byte OP_FLOAD_2
```
  See Also:
  
  Constant Field Values
- OP_FLOAD_3
```
public static final byte OP_FLOAD_3
```
  See Also:
  
  Constant Field Values
- OP_DLOAD_0
```
public static final byte OP_DLOAD_0
```
  See Also:
  
  Constant Field Values
- OP_DLOAD_1
```
public static final byte OP_DLOAD_1
```
  See Also:
  
  Constant Field Values
- OP_DLOAD_2
```
public static final byte OP_DLOAD_2
```
  See Also:
  
  Constant Field Values
- OP_DLOAD_3
```
public static final byte OP_DLOAD_3
```
  See Also:
  
  Constant Field Values
- OP_ALOAD_0
```
public static final byte OP_ALOAD_0
```
  See Also:
  
  Constant Field Values
- OP_ALOAD_1
```
public static final byte OP_ALOAD_1
```
  See Also:
  
  Constant Field Values
- OP_ALOAD_2
```
public static final byte OP_ALOAD_2
```
  See Also:
  
  Constant Field Values
- OP_ALOAD_3
```
public static final byte OP_ALOAD_3
```
  See Also:
  
  Constant Field Values
- OP_IALOAD
```
public static final byte OP_IALOAD
```
  See Also:
  
  Constant Field Values
- OP_LALOAD
```
public static final byte OP_LALOAD
```
  See Also:
  
  Constant Field Values
- OP_FALOAD
```
public static final byte OP_FALOAD
```
  See Also:
  
  Constant Field Values
- OP_DALOAD
```
public static final byte OP_DALOAD
```
  See Also:
  
  Constant Field Values
- OP_AALOAD
```
public static final byte OP_AALOAD
```
  See Also:
  
  Constant Field Values
- OP_BALOAD
```
public static final byte OP_BALOAD
```
  See Also:
  
  Constant Field Values
- OP_CALOAD
```
public static final byte OP_CALOAD
```
  See Also:
  
  Constant Field Values
- OP_SALOAD
```
public static final byte OP_SALOAD
```
  See Also:
  
  Constant Field Values
- OP_ISTORE
```
public static final byte OP_ISTORE
```
  See Also:
  
  Constant Field Values
- OP_LSTORE
```
public static final byte OP_LSTORE
```
  See Also:
  
  Constant Field Values
- OP_FSTORE
```
public static final byte OP_FSTORE
```
  See Also:
  
  Constant Field Values
- OP_DSTORE
```
public static final byte OP_DSTORE
```
  See Also:
  
  Constant Field Values
- OP_ASTORE
```
public static final byte OP_ASTORE
```
  See Also:
  
  Constant Field Values
- OP_ISTORE_0
```
public static final byte OP_ISTORE_0
```
  See Also:
  
  Constant Field Values
- OP_ISTORE_1
```
public static final byte OP_ISTORE_1
```
  See Also:
  
  Constant Field Values
- OP_ISTORE_2
```
public static final byte OP_ISTORE_2
```
  See Also:
  
  Constant Field Values
- OP_ISTORE_3
```
public static final byte OP_ISTORE_3
```
  See Also:
  
  Constant Field Values
- OP_LSTORE_0
```
public static final byte OP_LSTORE_0
```
  See Also:
  
  Constant Field Values
- OP_LSTORE_1
```
public static final byte OP_LSTORE_1
```
  See Also:
  
  Constant Field Values
- OP_LSTORE_2
```
public static final byte OP_LSTORE_2
```
  See Also:
  
  Constant Field Values
- OP_LSTORE_3
```
public static final byte OP_LSTORE_3
```
  See Also:
  
  Constant Field Values
- OP_FSTORE_0
```
public static final byte OP_FSTORE_0
```
  See Also:
  
  Constant Field Values
- OP_FSTORE_1
```
public static final byte OP_FSTORE_1
```
  See Also:
  
  Constant Field Values
- OP_FSTORE_2
```
public static final byte OP_FSTORE_2
```
  See Also:
  
  Constant Field Values
- OP_FSTORE_3
```
public static final byte OP_FSTORE_3
```
  See Also:
  
  Constant Field Values
- OP_DSTORE_0
```
public static final byte OP_DSTORE_0
```
  See Also:
  
  Constant Field Values
- OP_DSTORE_1
```
public static final byte OP_DSTORE_1
```
  See Also:
  
  Constant Field Values
- OP_DSTORE_2
```
public static final byte OP_DSTORE_2
```
  See Also:
  
  Constant Field Values
- OP_DSTORE_3
```
public static final byte OP_DSTORE_3
```
  See Also:
  
  Constant Field Values
- OP_ASTORE_0
```
public static final byte OP_ASTORE_0
```
  See Also:
  
  Constant Field Values
- OP_ASTORE_1
```
public static final byte OP_ASTORE_1
```
  See Also:
  
  Constant Field Values
- OP_ASTORE_2
```
public static final byte OP_ASTORE_2
```
  See Also:
  
  Constant Field Values
- OP_ASTORE_3
```
public static final byte OP_ASTORE_3
```
  See Also:
  
  Constant Field Values
- OP_IASTORE
```
public static final byte OP_IASTORE
```
  See Also:
  
  Constant Field Values
- OP_LASTORE
```
public static final byte OP_LASTORE
```
  See Also:
  
  Constant Field Values
- OP_FASTORE
```
public static final byte OP_FASTORE
```
  See Also:
  
  Constant Field Values
- OP_DASTORE
```
public static final byte OP_DASTORE
```
  See Also:
  
  Constant Field Values
- OP_AASTORE
```
public static final byte OP_AASTORE
```
  See Also:
  
  Constant Field Values
- OP_BASTORE
```
public static final byte OP_BASTORE
```
  See Also:
  
  Constant Field Values
- OP_CASTORE
```
public static final byte OP_CASTORE
```
  See Also:
  
  Constant Field Values
- OP_SASTORE
```
public static final byte OP_SASTORE
```
  See Also:
  
  Constant Field Values
- OP_POP
```
public static final byte OP_POP
```
  See Also:
  
  Constant Field Values
- OP_POP2
```
public static final byte OP_POP2
```
  See Also:
  
  Constant Field Values
- OP_DUP
```
public static final byte OP_DUP
```
  See Also:
  
  Constant Field Values
- OP_DUP_X1
```
public static final byte OP_DUP_X1
```
  See Also:
  
  Constant Field Values
- OP_DUP_X2
```
public static final byte OP_DUP_X2
```
  See Also:
  
  Constant Field Values
- OP_DUP2
```
public static final byte OP_DUP2
```
  See Also:
  
  Constant Field Values
- OP_DUP2_X1
```
public static final byte OP_DUP2_X1
```
  See Also:
  
  Constant Field Values
- OP_DUP2_X2
```
public static final byte OP_DUP2_X2
```
  See Also:
  
  Constant Field Values
- OP_SWAP
```
public static final byte OP_SWAP
```
  See Also:
  
  Constant Field Values
- OP_IADD
```
public static final byte OP_IADD
```
  See Also:
  
  Constant Field Values
- OP_LADD
```
public static final byte OP_LADD
```
  See Also:
  
  Constant Field Values
- OP_FADD
```
public static final byte OP_FADD
```
  See Also:
  
  Constant Field Values
- OP_DADD
```
public static final byte OP_DADD
```
  See Also:
  
  Constant Field Values
- OP_ISUB
```
public static final byte OP_ISUB
```
  See Also:
  
  Constant Field Values
- OP_LSUB
```
public static final byte OP_LSUB
```
  See Also:
  
  Constant Field Values
- OP_FSUB
```
public static final byte OP_FSUB
```
  See Also:
  
  Constant Field Values
- OP_DSUB
```
public static final byte OP_DSUB
```
  See Also:
  
  Constant Field Values
- OP_IMUL
```
public static final byte OP_IMUL
```
  See Also:
  
  Constant Field Values
- OP_LMUL
```
public static final byte OP_LMUL
```
  See Also:
  
  Constant Field Values
- OP_FMUL
```
public static final byte OP_FMUL
```
  See Also:
  
  Constant Field Values
- OP_DMUL
```
public static final byte OP_DMUL
```
  See Also:
  
  Constant Field Values
- OP_IDIV
```
public static final byte OP_IDIV
```
  See Also:
  
  Constant Field Values
- OP_LDIV
```
public static final byte OP_LDIV
```
  See Also:
  
  Constant Field Values
- OP_FDIV
```
public static final byte OP_FDIV
```
  See Also:
  
  Constant Field Values
- OP_DDIV
```
public static final byte OP_DDIV
```
  See Also:
  
  Constant Field Values
- OP_IREM
```
public static final byte OP_IREM
```
  See Also:
  
  Constant Field Values
- OP_LREM
```
public static final byte OP_LREM
```
  See Also:
  
  Constant Field Values
- OP_FREM
```
public static final byte OP_FREM
```
  See Also:
  
  Constant Field Values
- OP_DREM
```
public static final byte OP_DREM
```
  See Also:
  
  Constant Field Values
- OP_INEG
```
public static final byte OP_INEG
```
  See Also:
  
  Constant Field Values
- OP_LNEG
```
public static final byte OP_LNEG
```
  See Also:
  
  Constant Field Values
- OP_FNEG
```
public static final byte OP_FNEG
```
  See Also:
  
  Constant Field Values
- OP_DNEG
```
public static final byte OP_DNEG
```
  See Also:
  
  Constant Field Values
- OP_ISHL
```
public static final byte OP_ISHL
```
  See Also:
  
  Constant Field Values
- OP_LSHL
```
public static final byte OP_LSHL
```
  See Also:
  
  Constant Field Values
- OP_ISHR
```
public static final byte OP_ISHR
```
  See Also:
  
  Constant Field Values
- OP_LSHR
```
public static final byte OP_LSHR
```
  See Also:
  
  Constant Field Values
- OP_IUSHR
```
public static final byte OP_IUSHR
```
  See Also:
  
  Constant Field Values
- OP_LUSHR
```
public static final byte OP_LUSHR
```
  See Also:
  
  Constant Field Values
- OP_IAND
```
public static final byte OP_IAND
```
  See Also:
  
  Constant Field Values
- OP_LAND
```
public static final byte OP_LAND
```
  See Also:
  
  Constant Field Values
- OP_IOR
```
public static final byte OP_IOR
```
  See Also:
  
  Constant Field Values
- OP_LOR
```
public static final byte OP_LOR
```
  See Also:
  
  Constant Field Values
- OP_IXOR
```
public static final byte OP_IXOR
```
  See Also:
  
  Constant Field Values
- OP_LXOR
```
public static final byte OP_LXOR
```
  See Also:
  
  Constant Field Values
- OP_IINC
```
public static final byte OP_IINC
```
  See Also:
  
  Constant Field Values
- OP_I2L
```
public static final byte OP_I2L
```
  See Also:
  
  Constant Field Values
- OP_I2F
```
public static final byte OP_I2F
```
  See Also:
  
  Constant Field Values
- OP_I2D
```
public static final byte OP_I2D
```
  See Also:
  
  Constant Field Values
- OP_L2I
```
public static final byte OP_L2I
```
  See Also:
  
  Constant Field Values
- OP_L2F
```
public static final byte OP_L2F
```
  See Also:
  
  Constant Field Values
- OP_L2D
```
public static final byte OP_L2D
```
  See Also:
  
  Constant Field Values
- OP_F2I
```
public static final byte OP_F2I
```
  See Also:
  
  Constant Field Values
- OP_F2L
```
public static final byte OP_F2L
```
  See Also:
  
  Constant Field Values
- OP_F2D
```
public static final byte OP_F2D
```
  See Also:
  
  Constant Field Values
- OP_D2I
```
public static final byte OP_D2I
```
  See Also:
  
  Constant Field Values
- OP_D2L
```
public static final byte OP_D2L
```
  See Also:
  
  Constant Field Values
- OP_D2F
```
public static final byte OP_D2F
```
  See Also:
  
  Constant Field Values
- OP_I2B
```
public static final byte OP_I2B
```
  See Also:
  
  Constant Field Values
- OP_I2C
```
public static final byte OP_I2C
```
  See Also:
  
  Constant Field Values
- OP_I2S
```
public static final byte OP_I2S
```
  See Also:
  
  Constant Field Values
- OP_LCMP
```
public static final byte OP_LCMP
```
  See Also:
  
  Constant Field Values
- OP_FCMPL
```
public static final byte OP_FCMPL
```
  See Also:
  
  Constant Field Values
- OP_FCMPG
```
public static final byte OP_FCMPG
```
  See Also:
  
  Constant Field Values
- OP_DCMPL
```
public static final byte OP_DCMPL
```
  See Also:
  
  Constant Field Values
- OP_DCMPG
```
public static final byte OP_DCMPG
```
  See Also:
  
  Constant Field Values
- OP_IFEQ
```
public static final byte OP_IFEQ
```
  See Also:
  
  Constant Field Values
- OP_IFNE
```
public static final byte OP_IFNE
```
  See Also:
  
  Constant Field Values
- OP_IFLT
```
public static final byte OP_IFLT
```
  See Also:
  
  Constant Field Values
- OP_IFGE
```
public static final byte OP_IFGE
```
  See Also:
  
  Constant Field Values
- OP_IFGT
```
public static final byte OP_IFGT
```
  See Also:
  
  Constant Field Values
- OP_IFLE
```
public static final byte OP_IFLE
```
  See Also:
  
  Constant Field Values
- OP_IFICMPEQ
```
public static final byte OP_IFICMPEQ
```
  See Also:
  
  Constant Field Values
- OP_IFICMPNE
```
public static final byte OP_IFICMPNE
```
  See Also:
  
  Constant Field Values
- OP_IFICMPLT
```
public static final byte OP_IFICMPLT
```
  See Also:
  
  Constant Field Values
- OP_IFICMPGE
```
public static final byte OP_IFICMPGE
```
  See Also:
  
  Constant Field Values
- OP_IFICMPGT
```
public static final byte OP_IFICMPGT
```
  See Also:
  
  Constant Field Values
- OP_IFICMPLE
```
public static final byte OP_IFICMPLE
```
  See Also:
  
  Constant Field Values
- OP_IFACMPEQ
```
public static final byte OP_IFACMPEQ
```
  See Also:
  
  Constant Field Values
- OP_IFACMPNE
```
public static final byte OP_IFACMPNE
```
  See Also:
  
  Constant Field Values
- OP_GOTO
```
public static final byte OP_GOTO
```
  See Also:
  
  Constant Field Values
- OP_JSR
```
public static final byte OP_JSR
```
  See Also:
  
  Constant Field Values
- OP_RET
```
public static final byte OP_RET
```
  See Also:
  
  Constant Field Values
- OP_TABLESWITCH
```
public static final byte OP_TABLESWITCH
```
  See Also:
  
  Constant Field Values
- OP_LOOKUPSWITCH
```
public static final byte OP_LOOKUPSWITCH
```
  See Also:
  
  Constant Field Values
- OP_IRETURN
```
public static final byte OP_IRETURN
```
  See Also:
  
  Constant Field Values
- OP_LRETURN
```
public static final byte OP_LRETURN
```
  See Also:
  
  Constant Field Values
- OP_FRETURN
```
public static final byte OP_FRETURN
```
  See Also:
  
  Constant Field Values
- OP_DRETURN
```
public static final byte OP_DRETURN
```
  See Also:
  
  Constant Field Values
- OP_ARETURN
```
public static final byte OP_ARETURN
```
  See Also:
  
  Constant Field Values
- OP_RETURN
```
public static final byte OP_RETURN
```
  See Also:
  
  Constant Field Values
- OP_GETSTATIC
```
public static final byte OP_GETSTATIC
```
  See Also:
  
  Constant Field Values
- OP_PUTSTATIC
```
public static final byte OP_PUTSTATIC
```
  See Also:
  
  Constant Field Values
- OP_GETFIELD
```
public static final byte OP_GETFIELD
```
  See Also:
  
  Constant Field Values
- OP_PUTFIELD
```
public static final byte OP_PUTFIELD
```
  See Also:
  
  Constant Field Values
- OP_INVOKEVIRTUAL
```
public static final byte OP_INVOKEVIRTUAL
```
  See Also:
  
  Constant Field Values
- OP_INVOKESPECIAL
```
public static final byte OP_INVOKESPECIAL
```
  See Also:
  
  Constant Field Values
- OP_INVOKESTATIC
```
public static final byte OP_INVOKESTATIC
```
  See Also:
  
  Constant Field Values
- OP_INVOKEINTERFACE
```
public static final byte OP_INVOKEINTERFACE
```
  See Also:
  
  Constant Field Values
- OP_INVOKEDYNAMIC
```
public static final byte OP_INVOKEDYNAMIC
```
  See Also:
  
  Constant Field Values
- OP_NEW
```
public static final byte OP_NEW
```
  See Also:
  
  Constant Field Values
- OP_NEWARRAY
```
public static final byte OP_NEWARRAY
```
  See Also:
  
  Constant Field Values
- OP_ANEWARRAY
```
public static final byte OP_ANEWARRAY
```
  See Also:
  
  Constant Field Values
- OP_ARRAYLENGTH
```
public static final byte OP_ARRAYLENGTH
```
  See Also:
  
  Constant Field Values
- OP_ATHROW
```
public static final byte OP_ATHROW
```
  See Also:
  
  Constant Field Values
- OP_CHECKCAST
```
public static final byte OP_CHECKCAST
```
  See Also:
  
  Constant Field Values
- OP_INSTANCEOF
```
public static final byte OP_INSTANCEOF
```
  See Also:
  
  Constant Field Values
- OP_MONITORENTER
```
public static final byte OP_MONITORENTER
```
  See Also:
  
  Constant Field Values
- OP_MONITOREXIT
```
public static final byte OP_MONITOREXIT
```
  See Also:
  
  Constant Field Values
- OP_WIDE
```
public static final byte OP_WIDE
```
  See Also:
  
  Constant Field Values
- OP_MULTIANEWARRAY
```
public static final byte OP_MULTIANEWARRAY
```
  See Also:
  
  Constant Field Values
- OP_IFNULL
```
public static final byte OP_IFNULL
```
  See Also:
  
  Constant Field Values
- OP_IFNONNULL
```
public static final byte OP_IFNONNULL
```
  See Also:
  
  Constant Field Values
- OP_GOTO_W
```
public static final byte OP_GOTO_W
```
  See Also:
  
  Constant Field Values
- OP_JSR_W
```
public static final byte OP_JSR_W
```
  See Also:
  
  Constant Field Values
- NAMES
```
public static final java.lang.String[] NAMES
```
- ARRAY_T_BOOLEAN
```
public static final byte ARRAY_T_BOOLEAN
```
  See Also:
  
  Constant Field Values
- ARRAY_T_CHAR
```
public static final byte ARRAY_T_CHAR
```
  See Also:
  
  Constant Field Values
- ARRAY_T_FLOAT
```
public static final byte ARRAY_T_FLOAT
```
  See Also:
  
  Constant Field Values
- ARRAY_T_DOUBLE
```
public static final byte ARRAY_T_DOUBLE
```
  See Also:
  
  Constant Field Values
- ARRAY_T_BYTE
```
public static final byte ARRAY_T_BYTE
```
  See Also:
  
  Constant Field Values
- ARRAY_T_SHORT
```
public static final byte ARRAY_T_SHORT
```
  See Also:
  
  Constant Field Values
- ARRAY_T_INT
```
public static final byte ARRAY_T_INT
```
  See Also:
  
  Constant Field Values
- ARRAY_T_LONG
```
public static final byte ARRAY_T_LONG
```
  See Also:
  
  Constant Field Values
- opcode
```
public byte opcode
```

Constructor Detail
- Instruction
```
public Instruction()
```

Method Detail

equals

public abstract boolean equals(java.lang.Object o)

Overrides:: equals in class java.lang.Object

hashCode
```
public abstract int hashCode()
```
Overrides:

hashCode in class java.lang.Object

canonicalOpcode
```
public byte canonicalOpcode()
```
Returns the canonical opcode of this instruction, i.e. typically the opcode whose extension has been removed.

actualOpcode
```
public byte actualOpcode()
```
Returns the actual opcode of this instruction, i.e. the opcode that is stored in the bytecode.

shrink
```
public abstract Instruction shrink()
```
Shrinks this instruction to its shortest possible form.

Returns:

this instruction.

write

public final void write(CodeAttribute codeAttribute,
                        int offset)

Writes the Instruction at the given offset in the given code attribute.

write
```
public void write(byte[] code,
                  int offset)
```
Writes the Instruction at the given offset in the given code array.

isWide
```
protected boolean isWide()
```
Returns whether the instruction is wide, i.e. preceded by a wide opcode. With the current specifications, only variable instructions can be wide.

readInfo

protected abstract void readInfo(byte[] code,
                                 int offset)

Reads the data following the instruction opcode.

writeInfo

protected abstract void writeInfo(byte[] code,
                                  int offset)

Writes data following the instruction opcode.

length
```
public abstract int length(int offset)
```
Returns the length in bytes of the instruction.

accept

public abstract void accept(Clazz clazz,
                            Method method,
                            CodeAttribute codeAttribute,
                            int offset,
                            InstructionVisitor instructionVisitor)

Accepts the given visitor.

toString

public java.lang.String toString(Clazz clazz,
                                 int offset)

Returns a description of the instruction, at the given offset.

toString
```
public java.lang.String toString(int offset)
```
Returns a description of the instruction, at the given offset.

getName
```
public java.lang.String getName()
```
Returns the name of the instruction.

mayThrowExceptions
```
public boolean mayThrowExceptions()
```
Returns whether the instruction may conservatively throw exceptions.

mayInstanceThrowExceptions
```
public boolean mayInstanceThrowExceptions(Clazz clazz)
```
Returns whether a particular instance of an instruction may throw exceptions.

isCategory2
```
public boolean isCategory2()
```
Returns whether the instruction is a Category 2 instruction. This means that it operates on long or double arguments.

stackPopCount
```
public int stackPopCount(Clazz clazz)
```
Returns the number of entries popped from the stack during the execution of the instruction.

stackPushCount
```
public int stackPushCount(Clazz clazz)
```
Returns the number of entries pushed onto the stack during the execution of the instruction.

stackEntryIndexBefore
```
public int stackEntryIndexBefore(Clazz clazz,
                                 int stackEntryIndexAfter)
```
Returns the stack entry index from which the specified stack entry is copied by a dup/swap/checkcast instruction, or -1 otherwise. Stack entry indices are counted from the top of the stack.
- checkcast: after: 0 (before: 0 ) -- not anymore
- dup: after: 0 0 (before: 0 )
- dup_x1: after: 0 1 0 (before: 1 0 )
- dup_x2: after: 0 2 1 0 (before: 2 1 0 )
- dup2: after: 1 0 1 0 (before: 1 0 )
- dup2_x1: after: 1 0 2 1 0 (before: 2 1 0 )
- dup2_x2: after: 1 0 3 2 1 0 (before: 3 2 1 0)

readByte

protected static int readByte(byte[] code,
                              int offset)

readShort

protected static int readShort(byte[] code,
                               int offset)

readInt

protected static int readInt(byte[] code,
                             int offset)

readValue

protected static int readValue(byte[] code,
                               int offset,
                               int valueSize)

readSignedByte

protected static int readSignedByte(byte[] code,
                                    int offset)

readSignedShort

protected static int readSignedShort(byte[] code,
                                     int offset)

readSignedValue

protected static int readSignedValue(byte[] code,
                                     int offset,
                                     int valueSize)

writeByte

protected static void writeByte(byte[] code,
                                int offset,
                                int value)

writeShort

protected static void writeShort(byte[] code,
                                 int offset,
                                 int value)

writeInt

protected static void writeInt(byte[] code,
                               int offset,
                               int value)

writeValue

protected static void writeValue(byte[] code,
                                 int offset,
                                 int value,
                                 int valueSize)

writeSignedByte

protected static void writeSignedByte(byte[] code,
                                      int offset,
                                      int value)

writeSignedShort

protected static void writeSignedShort(byte[] code,
                                       int offset,
                                       int value)

writeSignedValue

protected static void writeSignedValue(byte[] code,
                                       int offset,
                                       int value,
                                       int valueSize)

Class Instruction

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

OP_NOP

OP_ACONST_NULL

OP_ICONST_M1

OP_ICONST_0

OP_ICONST_1

OP_ICONST_2

OP_ICONST_3

OP_ICONST_4

OP_ICONST_5

OP_LCONST_0

OP_LCONST_1

OP_FCONST_0

OP_FCONST_1

OP_FCONST_2

OP_DCONST_0

OP_DCONST_1

OP_BIPUSH

OP_SIPUSH

OP_LDC

OP_LDC_W

OP_LDC2_W

OP_ILOAD

OP_LLOAD

OP_FLOAD

OP_DLOAD

OP_ALOAD

OP_ILOAD_0

OP_ILOAD_1

OP_ILOAD_2

OP_ILOAD_3

OP_LLOAD_0

OP_LLOAD_1

OP_LLOAD_2

OP_LLOAD_3

OP_FLOAD_0

OP_FLOAD_1

OP_FLOAD_2

OP_FLOAD_3

OP_DLOAD_0

OP_DLOAD_1

OP_DLOAD_2

OP_DLOAD_3

OP_ALOAD_0

OP_ALOAD_1

OP_ALOAD_2

OP_ALOAD_3

OP_IALOAD

OP_LALOAD

OP_FALOAD

OP_DALOAD

OP_AALOAD

OP_BALOAD

OP_CALOAD

OP_SALOAD

OP_ISTORE

OP_LSTORE

OP_FSTORE

OP_DSTORE

OP_ASTORE

OP_ISTORE_0

OP_ISTORE_1

OP_ISTORE_2

OP_ISTORE_3

OP_LSTORE_0

OP_LSTORE_1

OP_LSTORE_2

OP_LSTORE_3

OP_FSTORE_0

OP_FSTORE_1

OP_FSTORE_2

OP_FSTORE_3

OP_DSTORE_0

OP_DSTORE_1

OP_DSTORE_2