Package proguard.classfile.instruction

Class SimpleInstruction

java.lang.Object

proguard.classfile.instruction.Instruction

proguard.classfile.instruction.SimpleInstruction

public class SimpleInstruction
extends Instruction

This Instruction represents a simple instruction without variable arguments or constant pool references.

Field Summary

Fields

Modifier and Type	Field	Description
int	constant

Fields inherited from class proguard.classfile.instruction.Instruction

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

Constructor Summary

Constructors

Constructor	Description
SimpleInstruction()	Creates an uninitialized SimpleInstruction.
SimpleInstruction(byte opcode)	Creates a new SimpleInstruction with the given opcode.
SimpleInstruction(byte opcode, int constant)	Creates a new SimpleInstruction with the given opcode and constant.

Method Summary

Modifier and Type	Method	Description
void	accept(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, InstructionVisitor instructionVisitor)	Accepts the given visitor.
byte	canonicalOpcode()	Returns the canonical opcode of this instruction, i.e.
SimpleInstruction	copy(SimpleInstruction simpleInstruction)	Copies the given instruction into this instruction.
boolean	equals(Object o)
int	hashCode()
int	length(int offset)	Returns the length in bytes of the instruction.
protected void	readInfo(byte[] code, int offset)	Reads the data following the instruction opcode.
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.
String	toString()
protected void	writeInfo(byte[] code, int offset)	Writes data following the instruction opcode.

Methods inherited from class proguard.classfile.instruction.Instruction

actualOpcode, getName, isCategory2, isWide, mayInstanceThrowExceptions, mayThrowExceptions, readByte, readInt, readShort, readSignedByte, readSignedShort, readSignedValue, readValue, stackPopCount, stackPushCount, toString, toString, write, write, writeByte, writeInt, writeShort, writeSignedByte, writeSignedShort, writeSignedValue, writeValue

Methods inherited from class java.lang.Object

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

Field Details

constant

public int constant

Constructor Details

SimpleInstruction

public SimpleInstruction()

Creates an uninitialized SimpleInstruction.

SimpleInstruction

public SimpleInstruction(byte opcode)

Creates a new SimpleInstruction with the given opcode. Automatically extracts any embedded constant.

SimpleInstruction

public SimpleInstruction(byte opcode,
 int constant)

Creates a new SimpleInstruction with the given opcode and constant. Automatically adapts the opcode if it has an embedded constant and the constant lies within the supported range. If the constant doesn't lie within the supported range, it must be adapted before the instruction can be written out.

Method Details

copy

public SimpleInstruction copy(SimpleInstruction simpleInstruction)

Copies the given instruction into this instruction.

Parameters:

simpleInstruction - the instruction to be copied.

Returns:

this instruction.

canonicalOpcode

public byte canonicalOpcode()

Description copied from class: Instruction

Returns the canonical opcode of this instruction, i.e. typically the opcode whose extension has been removed.

Overrides:

canonicalOpcode in class Instruction

shrink

public Instruction shrink()

Description copied from class: Instruction

Shrinks this instruction to its shortest possible form.

Specified by:

shrink in class Instruction

Returns:

this instruction.

readInfo

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

Description copied from class: Instruction

Reads the data following the instruction opcode.

Specified by:

readInfo in class Instruction

writeInfo

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

Description copied from class: Instruction

Writes data following the instruction opcode.

Specified by:

writeInfo in class Instruction

length

public int length(int offset)

Description copied from class: Instruction

Returns the length in bytes of the instruction.

Specified by:

length in class Instruction

accept

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

Description copied from class: Instruction

Accepts the given visitor.

Specified by:

accept in class Instruction

stackEntryIndexBefore

public int stackEntryIndexBefore(Clazz clazz,
 int stackEntryIndexAfter)

Description copied from class: Instruction

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)

Overrides:

stackEntryIndexBefore in class Instruction

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object o)

Specified by:

equals in class Instruction

hashCode

public int hashCode()

Specified by:

hashCode in class Instruction