org.jikesrvm.osr

Class ExecutionState

java.lang.Object

org.jikesrvm.osr.ExecutionState

public class ExecutionState
extends Object

Field Summary

Fields

Modifier and Type	Field and Description
int	bcIndex the program pointer (bytecode index)
int	callee_cmid callee's compiled method id
ExecutionState	callerState the caller's state if this method is an inlinee
int	cmid the compiled method id of the activation (a Java method may have multiple version of compiled method
Offset	fpOffset the offset of frame pointer of the activation.
private short	maxStackHeight
NormalMethod	meth the method of which the execution state belongs to
private int	objnum
private Object[]	objs
private int	rid
RVMThread	thread the thread on which the activation is running
Offset	tsFPOffset the callee (threadSwitch)'s frame pointer of this activation.
LinkedList<VariableElement>	varElms runtime values of locals and stack expressions at the bytecode index Each element is an object of VariableElement.

Constructor Summary

Constructors

Constructor and Description
ExecutionState(RVMThread whichThread, Offset framePointerOffset, int compiledMethodID, int pc, Offset tsFPOffset)

Method Summary

Modifier and Type	Method and Description
void	add(VariableElement elm)
void	addFirst(VariableElement elm)
private static PseudoBytecode	adjustStackHeight(PseudoBytecode last, int height)
private int	computeStackHeight(PseudoBytecode head)
private static byte[]	generateBinaries(PseudoBytecode bhead, int bsize) Generating binary code from pseudo code, the size and the code list are padded and well calculated.
byte[]	generatePrologue() Goes through variable elements and produces specialized prologue using pseudo-bytecode.
Offset	getFPOffset()
short	getMaxStackHeight()
NormalMethod	getMethod()
RVMThread	getThread()
Offset	getTSFPOffset()
private static int	paddingBytecode(PseudoBytecode head) Adds padding (NOP) at the beginning of pseudo bytecode to make the new bytecode size dividable by 4, then no branch target adjustment is needed in the original code.
void	printState() print the current state for debugging
private PseudoBytecode	processElement(VariableElement var, PseudoBytecode tail, int i)
void	setMethod(NormalMethod m)
String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

callerState

public ExecutionState callerState

the caller's state if this method is an inlinee

callee_cmid

public int callee_cmid

callee's compiled method id

meth

public NormalMethod meth

the method of which the execution state belongs to

bcIndex

public int bcIndex

the program pointer (bytecode index)

varElms

public LinkedList<VariableElement> varElms

runtime values of locals and stack expressions at the bytecode index Each element is an object of VariableElement.

thread

public RVMThread thread

the thread on which the activation is running

fpOffset

public Offset fpOffset

the offset of frame pointer of the activation.

tsFPOffset

public Offset tsFPOffset

the callee (threadSwitch)'s frame pointer of this activation.

cmid

public int cmid

the compiled method id of the activation (a Java method may have multiple version of compiled method

objs

private Object[] objs

objnum

private int objnum

rid

private int rid

maxStackHeight

private short maxStackHeight

Constructor Detail

ExecutionState

public ExecutionState(RVMThread whichThread,
                      Offset framePointerOffset,
                      int compiledMethodID,
                      int pc,
                      Offset tsFPOffset)

Method Detail

add

public void add(VariableElement elm)

addFirst

public void addFirst(VariableElement elm)

getThread

public RVMThread getThread()

getFPOffset

public Offset getFPOffset()

setMethod

public void setMethod(NormalMethod m)

getMethod

public NormalMethod getMethod()

getTSFPOffset

public Offset getTSFPOffset()

printState

public void printState()

print the current state for debugging

generatePrologue

public byte[] generatePrologue()

Goes through variable elements and produces specialized prologue using pseudo-bytecode.

Returns:

the specialized prologue

processElement

private PseudoBytecode processElement(VariableElement var,
                                      PseudoBytecode tail,
                                      int i)

getMaxStackHeight

public short getMaxStackHeight()

computeStackHeight

private int computeStackHeight(PseudoBytecode head)

adjustStackHeight

private static PseudoBytecode adjustStackHeight(PseudoBytecode last,
                                                int height)

paddingBytecode

private static int paddingBytecode(PseudoBytecode head)

Adds padding (NOP) at the beginning of pseudo bytecode to make the new bytecode size dividable by 4, then no branch target adjustment is needed in the original code.

Parameters:

head - the first pseudo bytecode (must be NOP)

Returns:

the new bytecode size

generateBinaries

private static byte[] generateBinaries(PseudoBytecode bhead,
                                       int bsize)

Generating binary code from pseudo code, the size and the code list are padded and well calculated.

Parameters:

bhead - the first pseude bytecode (must be a NOP)

bsize - the size of the bytecode

Returns:

generated bytecodes

toString

public String toString()

Overrides:

toString in class Object