sun.jvm.hotspot.debugger

Class PageCache

java.lang.Object

sun.jvm.hotspot.debugger.PageCache

public class PageCache
extends java.lang.Object

Constructor Summary

Constructors

Constructor and Description
PageCache(long pageSize, long maxNumPages, PageFetcher fetcher) The pageSize must be a power of two and implicitly specifies the alignment of pages.

Method Summary

Modifier and Type	Method and Description
void	clear() A mechanism for clearing out the cache is necessary to handle detaching and reattaching
void	clear(long startAddress, long numBytes) A mechanism for clearing cached data covering the given region
void	disable() Disables the page cache; no further pages will be added to the cache and all existing pages will be flushed.
void	enable() Enables the page cache; fetched pages will be added to the cache.
boolean	getBoolean(long address)
byte	getByte(long address)
char	getChar(long address, boolean bigEndian)
byte[]	getData(long startAddress, long numBytes) This handles fetches which span multiple pages by virtue of the presence of the PageFetcher.
double	getDouble(long address, boolean bigEndian)
float	getFloat(long address, boolean bigEndian)
int	getInt(long address, boolean bigEndian)
long	getLong(long address, boolean bigEndian)
short	getShort(long address, boolean bigEndian)

Methods inherited from class java.lang.Object

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

Constructor Detail

PageCache

public PageCache(long pageSize,
                 long maxNumPages,
                 PageFetcher fetcher)

The pageSize must be a power of two and implicitly specifies the alignment of pages. numPages specifies how many pages should be cached.

Method Detail

getData

public byte[] getData(long startAddress,
                      long numBytes)
               throws UnmappedAddressException

This handles fetches which span multiple pages by virtue of the presence of the PageFetcher. Throws UnmappedAddressException if a page on which data was requested was unmapped. This can not really handle numBytes > 32 bits.

Throws:

UnmappedAddressException

getBoolean

public boolean getBoolean(long address)

getByte

public byte getByte(long address)

getShort

public short getShort(long address,
                      boolean bigEndian)

getChar

public char getChar(long address,
                    boolean bigEndian)

getInt

public int getInt(long address,
                  boolean bigEndian)

getLong

public long getLong(long address,
                    boolean bigEndian)

getFloat

public float getFloat(long address,
                      boolean bigEndian)

getDouble

public double getDouble(long address,
                        boolean bigEndian)

clear

public void clear(long startAddress,
                  long numBytes)

A mechanism for clearing cached data covering the given region

clear

public void clear()

A mechanism for clearing out the cache is necessary to handle detaching and reattaching

disable

public void disable()

Disables the page cache; no further pages will be added to the cache and all existing pages will be flushed. Call this when the target process has been resumed.

enable

public void enable()

Enables the page cache; fetched pages will be added to the cache. Call this when the target process has been suspended.