harpoon.Analysis.PointerAnalysis
Class MyAP

java.lang.Object
  harpoon.Analysis.PointerAnalysis.MyAP

All Implemented Interfaces:

AllocationInformation.AllocationProperties, Serializable, Cloneable

public class MyAP
extends Object
implements AllocationInformation.AllocationProperties, Serializable, Cloneable

MyAP is my own implementation for the AllocationProperties.

Version:

$Id: MyAP.java,v 1.6 2003/03/03 23:41:45 salcianu Exp $

Author:

Alexandru SALCIANU <salcianu@retezat.lcs.mit.edu>

See Also:

Serialized Form

Field Summary

Temp	ah
boolean	hip
boolean	mh
boolean	ns
boolean	sa
boolean	ta
boolean	uoh

Constructor Summary

MyAP(HClass actualClass)
Creates a MyAP.

Method Summary

HClass	actualClass()
Temp	allocationHeap()
boolean	canBeStackAllocated()
boolean	canBeThreadAllocated()
Object	clone()
Label	getLabelOfPtrToMemoryChunk()
int	getUniqueID()
boolean	hasInteriorPointers()
boolean	makeHeap()
boolean	noSync()
boolean	setDynamicWBFlag()
String	toString() Pretty printer for debug.

Methods inherited from class java.lang.Object

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

Field Detail

hip

public boolean hip

sa

public boolean sa

ta

public boolean ta

uoh

public boolean uoh

mh

public boolean mh

ns

public boolean ns

ah

public Temp ah

Constructor Detail

MyAP

public MyAP(HClass actualClass)

Creates a MyAP.

Method Detail

hasInteriorPointers

public boolean hasInteriorPointers()

Specified by:

hasInteriorPointers in interface AllocationInformation.AllocationProperties

Returns:

true if the object allocated at this site has interior pointers; that is, it is not a primitive array, and some field in the allocated object is not primitive.

canBeStackAllocated

public boolean canBeStackAllocated()

Specified by:

canBeStackAllocated in interface AllocationInformation.AllocationProperties

Returns:

true if the object can be allocated on the stack; that is, the lifetime of the object does not exceed the execution of the method containing the allocation.

canBeThreadAllocated

public boolean canBeThreadAllocated()

Specified by:

canBeThreadAllocated in interface AllocationInformation.AllocationProperties

Returns:

true if the object can be allocated on a thread-local heap; that is, the lifetime of the object does not exceed the lifetime of the thread object specified by the allocationHeap method.

makeHeap

public boolean makeHeap()

Specified by:

makeHeap in interface AllocationInformation.AllocationProperties

Returns:

true if a thread-local heap should be associated with this object --- typically this means that the allocation site is a thread creation. If this is true and canBeThreadAllocated() is also true, then the new object will be itself allocated on the created heap; otherwise the new object will be globally allocated.

noSync

public boolean noSync()

Specified by:

noSync in interface AllocationInformation.AllocationProperties

allocationHeap

public Temp allocationHeap()

Specified by:

allocationHeap in interface AllocationInformation.AllocationProperties

Returns:

a Temp which at the allocation site contains a reference to either the thread object of a thread-local allocation, or to another object whose lifetime is correlated with that of the (not-yet-created) thread object. Returns null if the allocation should use the heap associated with the "current" thread. If this returns non-null, then makeHeap() should return false and canBeThreadAllocated() should return true.

actualClass

public HClass actualClass()

Specified by:

actualClass in interface AllocationInformation.AllocationProperties

Returns:

the HClass representing the "actual" or instantiated class of the object for which memory is being allocated (as opposed to the declared class).

setDynamicWBFlag

public boolean setDynamicWBFlag()

Specified by:

setDynamicWBFlag in interface AllocationInformation.AllocationProperties

Returns:

true if the dynamic write barrier flag needs to be set when the object is allocated--this typically means that one or more write barriers associated with stores into the object created at this allocation site have been optimistically removed.

getLabelOfPtrToMemoryChunk

public Label getLabelOfPtrToMemoryChunk()

Specified by:

getLabelOfPtrToMemoryChunk in interface AllocationInformation.AllocationProperties

Returns:

a Label for a pointer that points (at runtime) to a preallocated memory chunk to be used for this allocation site. Returns null if we cannot preallocate this allocation site.

getUniqueID

public int getUniqueID()

Specified by:

getUniqueID in interface AllocationInformation.AllocationProperties

Returns:

an unique integer ID for the allocation site. Useful for instrumentation purposes.

clone

public Object clone()

Overrides:

clone in class Object

toString

public String toString()

Pretty printer for debug.

Overrides:

toString in class Object