com.videobug.agent.weaver.method

Class OpcodesUtil

java.lang.Object

com.videobug.agent.weaver.method.OpcodesUtil

public class OpcodesUtil
extends Object

This is a utility class providing static methods to support bytecode manipulation.

Constructor Summary

Constructors

Constructor and Description
OpcodesUtil()

Method Summary

Modifier and Type	Method and Description
static String	getArrayElementType(int type)
static org.objectweb.asm.Type	getAsmType(String desc)
static com.insidious.common.weaver.Descriptor	getDescForArrayLoad(int opcode)
static String	getDescForArrayStore(int opcode)
static com.insidious.common.weaver.Descriptor	getDescForLoad(int opcode)
static com.insidious.common.weaver.Descriptor	getDescForReturn(int opcode)
static com.insidious.common.weaver.Descriptor	getDescForStore(int opcode)
static int	getDupInstruction(String desc)
static int	getLoadInstruction(String desc)
static int	getStoreInstruction(String desc)
static String	getString(int opcode)
static boolean	isArrayLoad(int opcode)
static boolean	isArrayStore(int opcode)
static boolean	isReturn(int opcode)

Methods inherited from class java.lang.Object

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

Constructor Detail

OpcodesUtil

public OpcodesUtil()

Method Detail

isReturn

public static boolean isReturn(int opcode)

Parameters:

opcode - specifies the opcode of an instruction.

Returns:

true if the instruction is one of RETURN instructions.

isArrayLoad

public static boolean isArrayLoad(int opcode)

Parameters:

opcode - specifies the opcode of an instruction.

Returns:

true if the instruction is one of ARRAY LOAD instructions.

isArrayStore

public static boolean isArrayStore(int opcode)

Parameters:

opcode - specifies the opcode of an instruction.

Returns:

true if the instruction is one of ARRAY STORE instructions.

getDupInstruction

public static int getDupInstruction(String desc)

Parameters:

desc - specifies a value type.

Returns:

opcode of DUP or DUP2 instructions appropriate for the value type.

getLoadInstruction

public static int getLoadInstruction(String desc)

Parameters:

desc - specifies a value type.

Returns:

opcode of a load instruction appropriate for the value type.

getAsmType

public static org.objectweb.asm.Type getAsmType(String desc)

Parameters:

desc - specifies a value type.

Returns:

a Type object representing the value type.

getStoreInstruction

public static int getStoreInstruction(String desc)

Parameters:

desc - specifies a value type.

Returns:

opcode of a store instruction appropriate for the value type.

getArrayElementType

public static String getArrayElementType(int type)

Parameters:

type - specifies an element type for NEWARRAY instruction.

Returns:

the type name corresponding the type code.

getDescForArrayStore

public static String getDescForArrayStore(int opcode)

Parameters:

opcode - specifies one of ARRAY STORE instructions.

Returns:

a descriptor of the element data type.

getDescForArrayLoad

public static com.insidious.common.weaver.Descriptor getDescForArrayLoad(int opcode)

Parameters:

opcode - specifies one of ARRAY LOAD instructions.

Returns:

a descriptor of the element data type. TODO This method and related methods should go to the Descriptor class

getDescForStore

public static com.insidious.common.weaver.Descriptor getDescForStore(int opcode)

Parameters:

opcode - specifies one of local store instructions.

Returns:

a descriptor of the data type.

getDescForLoad

public static com.insidious.common.weaver.Descriptor getDescForLoad(int opcode)

Parameters:

opcode - specifies one of local load instructions.

Returns:

a descriptor of the data type.

getDescForReturn

public static com.insidious.common.weaver.Descriptor getDescForReturn(int opcode)

Parameters:

opcode - specifies one of return instructions.

Returns:

a descriptor of the data type.

getString

public static String getString(int opcode)

Parameters:

opcode - specifies a Java bytecode.

Returns:

its string name.