Package proguard.classfile.instruction

Class Instruction

java.lang.Object

proguard.classfile.instruction.Instruction

Direct Known Subclasses:

BranchInstruction, CodeAttributeEditor.Label, ConstantInstruction, InstructionSequenceReplacer.Label, SimpleInstruction, SwitchInstruction, VariableInstruction

public abstract class Instruction
extends Object

Base class for representing instructions.

Field Summary

Fields

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

Constructor Summary

Constructors

Constructor	Description
Instruction()

Method Summary

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(Object o)
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.
String	toString(int offset)	Returns a description of the instruction, at the given offset.
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.
final 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 Details

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

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• Constant Field Values

OP_ICONST_0

public static final byte OP_ICONST_0

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• Constant Field Values

OP_ICONST_1

public static final byte OP_ICONST_1

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• Constant Field Values

OP_ICONST_2

public static final byte OP_ICONST_2

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• Constant Field Values

OP_ICONST_3

public static final byte OP_ICONST_3

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• Constant Field Values

OP_ICONST_4

public static final byte OP_ICONST_4

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• Constant Field Values

OP_ICONST_5

public static final byte OP_ICONST_5

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• Constant Field Values

OP_LCONST_0

public static final byte OP_LCONST_0

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• Constant Field Values

OP_LCONST_1

public static final byte OP_LCONST_1

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• Constant Field Values

OP_FCONST_0

public static final byte OP_FCONST_0

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• Constant Field Values

OP_FCONST_1

public static final byte OP_FCONST_1

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• Constant Field Values

OP_FCONST_2

public static final byte OP_FCONST_2

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• Constant Field Values

OP_DCONST_0

public static final byte OP_DCONST_0

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• Constant Field Values

OP_DCONST_1

public static final byte OP_DCONST_1

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• Constant Field Values

OP_BIPUSH

public static final byte OP_BIPUSH

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• Constant Field Values

OP_SIPUSH

public static final byte OP_SIPUSH

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• Constant Field Values

OP_LDC

public static final byte OP_LDC

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• Constant Field Values

OP_LDC_W

public static final byte OP_LDC_W

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• Constant Field Values

OP_LDC2_W

public static final byte OP_LDC2_W

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• Constant Field Values

OP_ILOAD

public static final byte OP_ILOAD

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• Constant Field Values

OP_LLOAD

public static final byte OP_LLOAD

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• Constant Field Values

OP_FLOAD

public static final byte OP_FLOAD

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• Constant Field Values

OP_DLOAD

public static final byte OP_DLOAD

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• Constant Field Values

OP_ALOAD

public static final byte OP_ALOAD

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• Constant Field Values

OP_ILOAD_0

public static final byte OP_ILOAD_0

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• Constant Field Values

OP_ILOAD_1

public static final byte OP_ILOAD_1

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• Constant Field Values

OP_ILOAD_2

public static final byte OP_ILOAD_2

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• Constant Field Values

OP_ILOAD_3

public static final byte OP_ILOAD_3

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• Constant Field Values

OP_LLOAD_0

public static final byte OP_LLOAD_0

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• Constant Field Values

OP_LLOAD_1

public static final byte OP_LLOAD_1

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• Constant Field Values

OP_LLOAD_2

public static final byte OP_LLOAD_2

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• Constant Field Values

OP_LLOAD_3

public static final byte OP_LLOAD_3

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• Constant Field Values

OP_FLOAD_0

public static final byte OP_FLOAD_0

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• Constant Field Values

OP_FLOAD_1

public static final byte OP_FLOAD_1

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• Constant Field Values

OP_FLOAD_2

public static final byte OP_FLOAD_2

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• Constant Field Values

OP_FLOAD_3

public static final byte OP_FLOAD_3

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• Constant Field Values

OP_DLOAD_0

public static final byte OP_DLOAD_0

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• Constant Field Values

OP_DLOAD_1

public static final byte OP_DLOAD_1

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• Constant Field Values

OP_DLOAD_2

public static final byte OP_DLOAD_2

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• Constant Field Values

OP_DLOAD_3

public static final byte OP_DLOAD_3

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• Constant Field Values

OP_ALOAD_0

public static final byte OP_ALOAD_0

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• Constant Field Values

OP_ALOAD_1

public static final byte OP_ALOAD_1

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• Constant Field Values

OP_ALOAD_2

public static final byte OP_ALOAD_2

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• Constant Field Values

OP_ALOAD_3

public static final byte OP_ALOAD_3

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• Constant Field Values

OP_IALOAD

public static final byte OP_IALOAD

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• Constant Field Values

OP_LALOAD

public static final byte OP_LALOAD

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• Constant Field Values

OP_FALOAD

public static final byte OP_FALOAD

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• Constant Field Values

OP_DALOAD

public static final byte OP_DALOAD

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• Constant Field Values

OP_AALOAD

public static final byte OP_AALOAD

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• Constant Field Values

OP_BALOAD

public static final byte OP_BALOAD

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• Constant Field Values

OP_CALOAD

public static final byte OP_CALOAD

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• Constant Field Values

OP_SALOAD

public static final byte OP_SALOAD

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• Constant Field Values

OP_ISTORE

public static final byte OP_ISTORE

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• Constant Field Values

OP_LSTORE

public static final byte OP_LSTORE

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• Constant Field Values

OP_FSTORE

public static final byte OP_FSTORE

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• Constant Field Values

OP_DSTORE

public static final byte OP_DSTORE

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• Constant Field Values

OP_ASTORE

public static final byte OP_ASTORE

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• Constant Field Values

OP_ISTORE_0

public static final byte OP_ISTORE_0

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• Constant Field Values

OP_ISTORE_1

public static final byte OP_ISTORE_1

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• Constant Field Values

OP_ISTORE_2

public static final byte OP_ISTORE_2

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• Constant Field Values

OP_ISTORE_3

public static final byte OP_ISTORE_3

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• Constant Field Values

OP_LSTORE_0

public static final byte OP_LSTORE_0

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• Constant Field Values

OP_LSTORE_1

public static final byte OP_LSTORE_1

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• Constant Field Values

OP_LSTORE_2

public static final byte OP_LSTORE_2

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• Constant Field Values

OP_LSTORE_3

public static final byte OP_LSTORE_3

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• Constant Field Values

OP_FSTORE_0

public static final byte OP_FSTORE_0

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• Constant Field Values

OP_FSTORE_1

public static final byte OP_FSTORE_1

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• Constant Field Values

OP_FSTORE_2

public static final byte OP_FSTORE_2

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• Constant Field Values

OP_FSTORE_3

public static final byte OP_FSTORE_3

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• Constant Field Values

OP_DSTORE_0

public static final byte OP_DSTORE_0

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• Constant Field Values

OP_DSTORE_1

public static final byte OP_DSTORE_1

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• Constant Field Values

OP_DSTORE_2

public static final byte OP_DSTORE_2

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• Constant Field Values

OP_DSTORE_3

public static final byte OP_DSTORE_3

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• Constant Field Values

OP_ASTORE_0

public static final byte OP_ASTORE_0

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• Constant Field Values

OP_ASTORE_1

public static final byte OP_ASTORE_1

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• Constant Field Values

OP_ASTORE_2

public static final byte OP_ASTORE_2

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• Constant Field Values

OP_ASTORE_3

public static final byte OP_ASTORE_3

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• Constant Field Values

OP_IASTORE

public static final byte OP_IASTORE

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• Constant Field Values

OP_LASTORE

public static final byte OP_LASTORE

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• Constant Field Values

OP_FASTORE

public static final byte OP_FASTORE

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• Constant Field Values

OP_DASTORE

public static final byte OP_DASTORE

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• Constant Field Values

OP_AASTORE

public static final byte OP_AASTORE

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• Constant Field Values

OP_BASTORE

public static final byte OP_BASTORE

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• Constant Field Values

OP_CASTORE

public static final byte OP_CASTORE

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• Constant Field Values

OP_SASTORE

public static final byte OP_SASTORE

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• Constant Field Values

OP_POP

public static final byte OP_POP

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• Constant Field Values

OP_POP2

public static final byte OP_POP2

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• Constant Field Values

OP_DUP

public static final byte OP_DUP

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• Constant Field Values

OP_DUP_X1

public static final byte OP_DUP_X1

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• Constant Field Values

OP_DUP_X2

public static final byte OP_DUP_X2

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• Constant Field Values

OP_DUP2

public static final byte OP_DUP2

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• Constant Field Values

OP_DUP2_X1

public static final byte OP_DUP2_X1

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• Constant Field Values

OP_DUP2_X2

public static final byte OP_DUP2_X2

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• Constant Field Values

OP_SWAP

public static final byte OP_SWAP

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• Constant Field Values

OP_IADD

public static final byte OP_IADD

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• Constant Field Values

OP_LADD

public static final byte OP_LADD

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• Constant Field Values

OP_FADD

public static final byte OP_FADD

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• Constant Field Values

OP_DADD

public static final byte OP_DADD

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• Constant Field Values

OP_ISUB

public static final byte OP_ISUB

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• Constant Field Values

OP_LSUB

public static final byte OP_LSUB

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• Constant Field Values

OP_FSUB

public static final byte OP_FSUB

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• Constant Field Values

OP_DSUB

public static final byte OP_DSUB

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• Constant Field Values

OP_IMUL

public static final byte OP_IMUL

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• Constant Field Values

OP_LMUL

public static final byte OP_LMUL

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• Constant Field Values

OP_FMUL

public static final byte OP_FMUL

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• Constant Field Values

OP_DMUL

public static final byte OP_DMUL

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• Constant Field Values

OP_IDIV

public static final byte OP_IDIV

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• Constant Field Values

OP_LDIV

public static final byte OP_LDIV

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• Constant Field Values

OP_FDIV

public static final byte OP_FDIV

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• Constant Field Values

OP_DDIV

public static final byte OP_DDIV

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• Constant Field Values

OP_IREM

public static final byte OP_IREM

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• Constant Field Values

OP_LREM

public static final byte OP_LREM

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• Constant Field Values

OP_FREM

public static final byte OP_FREM

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• Constant Field Values

OP_DREM

public static final byte OP_DREM

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• Constant Field Values

OP_INEG

public static final byte OP_INEG

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• Constant Field Values

OP_LNEG

public static final byte OP_LNEG

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• Constant Field Values

OP_FNEG

public static final byte OP_FNEG

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• Constant Field Values

OP_DNEG

public static final byte OP_DNEG

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• Constant Field Values

OP_ISHL

public static final byte OP_ISHL

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• Constant Field Values

OP_LSHL

public static final byte OP_LSHL

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• Constant Field Values

OP_ISHR

public static final byte OP_ISHR

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• Constant Field Values

OP_LSHR

public static final byte OP_LSHR

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• Constant Field Values

OP_IUSHR

public static final byte OP_IUSHR

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• Constant Field Values

OP_LUSHR

public static final byte OP_LUSHR

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• Constant Field Values

OP_IAND

public static final byte OP_IAND

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• Constant Field Values

OP_LAND

public static final byte OP_LAND

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• Constant Field Values

OP_IOR

public static final byte OP_IOR

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• Constant Field Values

OP_LOR

public static final byte OP_LOR

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• Constant Field Values

OP_IXOR

public static final byte OP_IXOR

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• Constant Field Values

OP_LXOR

public static final byte OP_LXOR

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• Constant Field Values

OP_IINC

public static final byte OP_IINC

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• Constant Field Values

OP_I2L

public static final byte OP_I2L

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• Constant Field Values

OP_I2F

public static final byte OP_I2F

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• Constant Field Values

OP_I2D

public static final byte OP_I2D

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• Constant Field Values

OP_L2I

public static final byte OP_L2I

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• Constant Field Values

OP_L2F

public static final byte OP_L2F

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• Constant Field Values

OP_L2D

public static final byte OP_L2D

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• Constant Field Values

OP_F2I

public static final byte OP_F2I

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• Constant Field Values

OP_F2L

public static final byte OP_F2L

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• Constant Field Values

OP_F2D

public static final byte OP_F2D

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• Constant Field Values

OP_D2I

public static final byte OP_D2I

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• Constant Field Values

OP_D2L

public static final byte OP_D2L

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• Constant Field Values

OP_D2F

public static final byte OP_D2F

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• Constant Field Values

OP_I2B

public static final byte OP_I2B

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• Constant Field Values

OP_I2C

public static final byte OP_I2C

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• Constant Field Values

OP_I2S

public static final byte OP_I2S

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• Constant Field Values

OP_LCMP

public static final byte OP_LCMP

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• Constant Field Values

OP_FCMPL

public static final byte OP_FCMPL

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• Constant Field Values

OP_FCMPG

public static final byte OP_FCMPG

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• Constant Field Values

OP_DCMPL

public static final byte OP_DCMPL

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• Constant Field Values

OP_DCMPG

public static final byte OP_DCMPG

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• Constant Field Values

OP_IFEQ

public static final byte OP_IFEQ

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• Constant Field Values

OP_IFNE

public static final byte OP_IFNE

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• Constant Field Values

OP_IFLT

public static final byte OP_IFLT

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• Constant Field Values

OP_IFGE

public static final byte OP_IFGE

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• Constant Field Values

OP_IFGT

public static final byte OP_IFGT

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• Constant Field Values

OP_IFLE

public static final byte OP_IFLE

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• Constant Field Values

OP_IFICMPEQ

public static final byte OP_IFICMPEQ

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• Constant Field Values

OP_IFICMPNE

public static final byte OP_IFICMPNE

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• 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 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 Details

Instruction

public Instruction()

Method Details

equals

public abstract boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public abstract int hashCode()

Overrides:

hashCode in class 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 String toString(Clazz clazz,
 int offset)

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

toString

public String toString(int offset)

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

getName

public 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)