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Memory.Manager
Class GCMapIterator  

java.lang.Object
  Memory.Manager.GCMapIterator

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public abstract class GCMapIterator

extends java.lang.Object

Version:

$Id: GCMapIterator.java,v 1.2 2003/05/12 10:05:19 joewhaley Exp $

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Field Summary
Memory.StackAddress	framePtr           address of stackframe currently being scanned
Memory.StackAddress[]	registerLocations           address where each gpr register was saved by previously scanned stackframe(s)
Scheduler.jq_Thread	thread           thread whose stack is currently being scanned

 

Constructor Summary

GCMapIterator()

 

Method Summary
abstract  void	cleanupPointers()           Iteration is complete, release any internal data structures including locks acquired during setupIterator for jsr maps.
abstract  Memory.StackAddress	getNextReferenceAddress()           Get address of next object reference held by current stackframe.
abstract  Memory.StackAddress	getNextReturnAddressAddress()           Get address of next JSR return address held by current stackframe.
abstract  int	getType()           Get the type of this iterator (BASELINE, OPT, etc.).
void	newStackWalk(Scheduler.jq_Thread thread)           Prepare to scan a thread's stack and saved registers for object references.
abstract  void	reset()           Prepare to re-iterate on same stackframe, and to switch between "reference" iteration and "JSR return address" iteration.
abstract  void	setupIterator(Clazz.jq_CompiledCode compiledMethod, int instructionOffset, Memory.StackAddress framePtr)           Prepare to iterate over object references and JSR return addresses held by a stackframe.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

thread

public Scheduler.jq_Thread thread

thread whose stack is currently being scanned

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framePtr

public Memory.StackAddress framePtr

address of stackframe currently being scanned

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registerLocations

public Memory.StackAddress[] registerLocations

address where each gpr register was saved by previously scanned stackframe(s)

Constructor Detail

GCMapIterator

public GCMapIterator()

Method Detail

newStackWalk

public void newStackWalk(Scheduler.jq_Thread thread)

Prepare to scan a thread's stack and saved registers for object references.

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setupIterator

public abstract void setupIterator(Clazz.jq_CompiledCode compiledMethod,
                                   int instructionOffset,
                                   Memory.StackAddress framePtr)

Prepare to iterate over object references and JSR return addresses held by a stackframe.

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getNextReferenceAddress

public abstract Memory.StackAddress getNextReferenceAddress()

Get address of next object reference held by current stackframe. Returns zero when there are no more references to report.

Side effect: registerLocations[] updated at end of iteration. TODO: registerLocations[] update should be done via separately called method instead of as side effect.

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getNextReturnAddressAddress

public abstract Memory.StackAddress getNextReturnAddressAddress()

Get address of next JSR return address held by current stackframe.

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reset

public abstract void reset()

Prepare to re-iterate on same stackframe, and to switch between "reference" iteration and "JSR return address" iteration.

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cleanupPointers

public abstract void cleanupPointers()

Iteration is complete, release any internal data structures including locks acquired during setupIterator for jsr maps.

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getType

public abstract int getType()

Get the type of this iterator (BASELINE, OPT, etc.). Called from GCMapIteratorGroup to select which iterator to use for a stackframe. The possible types are specified in jq_CompiledCode.

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