com.mebigfatguy.fbcontrib.utils

Class RegisterUtils

java.lang.Object

com.mebigfatguy.fbcontrib.utils.RegisterUtils

public final class RegisterUtils
extends java.lang.Object

an auxiliary class for managing and manipulating registers

Constructor Summary

Constructors

Modifier	Constructor and Description
private	RegisterUtils() private to reinforce the helper status of the class

Method Summary

Modifier and Type	Method and Description
static int	getALoadReg(edu.umd.cs.findbugs.visitclass.DismantleBytecode dbc, int seen) returns the register used to load a reference
static int	getAStoreReg(edu.umd.cs.findbugs.visitclass.DismantleBytecode dbc, int seen) returns the register used to store a reference
static int	getLoadReg(edu.umd.cs.findbugs.visitclass.DismantleBytecode dbc, int seen) returns the register used in a load operation
static int	getLocalVariableEndRange(org.apache.bcel.classfile.LocalVariableTable lvt, int reg, int curPC) returns the end pc of the visible range of this register at this pc
static int[]	getParameterRegisters(org.apache.bcel.classfile.Method obj) gets the set of registers used for parameters
static int	getStoreReg(edu.umd.cs.findbugs.visitclass.DismantleBytecode dbc, int seen) returns the register used in a store operation

Methods inherited from class java.lang.Object

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

Constructor Detail

RegisterUtils

private RegisterUtils()

private to reinforce the helper status of the class

Method Detail

getAStoreReg

public static int getAStoreReg(edu.umd.cs.findbugs.visitclass.DismantleBytecode dbc,
                               int seen)

returns the register used to store a reference

Parameters:

dbc - the dismantle byte code parsing the class

seen - the opcode of the store

Returns:

the register stored into

getALoadReg

public static int getALoadReg(edu.umd.cs.findbugs.visitclass.DismantleBytecode dbc,
                              int seen)

returns the register used to load a reference

Parameters:

dbc - the dismantle byte code parsing the class

seen - the opcode of the load

Returns:

the register loaded from

getStoreReg

public static int getStoreReg(edu.umd.cs.findbugs.visitclass.DismantleBytecode dbc,
                              int seen)

returns the register used in a store operation

Parameters:

dbc - the dismantle byte code parsing the class

seen - the opcode of the store

Returns:

the register stored into

getLoadReg

public static int getLoadReg(edu.umd.cs.findbugs.visitclass.DismantleBytecode dbc,
                             int seen)

returns the register used in a load operation

Parameters:

dbc - the dismantle byte code parsing the class

seen - the opcode of the load

Returns:

the register stored into

getLocalVariableEndRange

public static int getLocalVariableEndRange(org.apache.bcel.classfile.LocalVariableTable lvt,
                                           int reg,
                                           int curPC)

returns the end pc of the visible range of this register at this pc

Parameters:

lvt - the local variable table for this method

reg - the register to examine

curPC - the pc of the current instruction

Returns:

the endpc

getParameterRegisters

public static int[] getParameterRegisters(org.apache.bcel.classfile.Method obj)

gets the set of registers used for parameters

Parameters:

obj - the context object for the method to find the parameter registers of

Returns:

the set of registers that parameters are using