com.sun.squawk.vm
Class FieldOffsets

java.lang.Object
  com.sun.squawk.vm.FieldOffsets

public class FieldOffsets
extends Object

This class contains the offsets and types for fields that must be directly accessed by the VM or other Squawk tools such as the mapper. The romizer ensures that these offsets and types are correct when it creates the image for the bootstrap suite. The value of the offset depends on whether the field is static or not - see Member.getOffset() for more detail.

A simple version of the field's type is also encoded into the high 32 bits of each entry all of which are longs. The types are restricted to byte, char, short, int, long, float, double, and Object and are encoded using the corresponding CID value placed in the high 32 bits of the long.

This unfortunate encoding is needed if we want to keep the type and offset in one place because these values are needed in parts of the VM that need to be executed before normal object construction can take place. Two routines are provided to decode the offset and type of a field, and the offset can also be obtained by casting the field into an int.

The name of the constant must be composed of the name of the class that defines the field (with '.'s replaced by '_'s) and the name of the field with a '$' separating them.

Field Summary

static long	com_sun_squawk_Isolate$savedStackChunks The offset of the 'savedStackChunks' field in com.sun.squawk.Isolate.
static long	com_sun_squawk_Klass$componentType The offset of the 'componentType' field in com.sun.squawk.Klass.
static long	com_sun_squawk_Klass$dataMap The offset of the 'dataMap' field in com.sun.squawk.Klass.
static long	com_sun_squawk_Klass$dataMapLength The offset of the 'dataMapLength' field in com.sun.squawk.Klass.
static long	com_sun_squawk_Klass$dataMapWord The offset of the 'dataMapWord' field in com.sun.squawk.Klass.
static long	com_sun_squawk_Klass$id The offset of the 'id' field in com.sun.squawk.Klass.
static long	com_sun_squawk_Klass$indexForClinit The offset of the 'indexForClinit' field in com.sun.squawk.Klass.
static long	com_sun_squawk_Klass$indexForInit The offset of the 'indexForInit' field in com.sun.squawk.Klass.
static long	com_sun_squawk_Klass$indexForMain The offset of the 'indexForMain' field in com.sun.squawk.Klass.
static long	com_sun_squawk_Klass$initModifiers The offset of the 'initModifiers' field in com.sun.squawk.Klass.
static long	com_sun_squawk_Klass$instanceSizeBytes The offset of the 'instanceSizeBytes' field in com.sun.squawk.Klass.
static long	com_sun_squawk_Klass$interfaces The offset of the 'superType' field in com.sun.squawk.Klass.
static long	com_sun_squawk_Klass$modifiers The offset of the 'modifiers' field in com.sun.squawk.Klass.
static long	com_sun_squawk_Klass$mustClinit The offset of the 'mustClinit' field in com.sun.squawk.Klass.
static long	com_sun_squawk_Klass$name The offset of the 'name' field in com.sun.squawk.Klass.
static long	com_sun_squawk_Klass$objects The offset of the 'objects' field in com.sun.squawk.Klass.
static long	com_sun_squawk_Klass$oopMap The offset of the 'oopMap' field in com.sun.squawk.Klass.
static long	com_sun_squawk_Klass$oopMapWord The offset of the 'oopMapWord' field in com.sun.squawk.Klass.
static long	com_sun_squawk_Klass$refStaticFieldsSize The offset of the 'refStaticFieldsSize' field in com.sun.squawk.Klass.
static long	com_sun_squawk_Klass$self The offset of the 'self' field in in com.sun.squawk.Klass and the 'klass' field com.sun.squawk.ObjectAssociation which must be identical.
static long	com_sun_squawk_Klass$state The offset of the 'state' field in com.sun.squawk.Klass.
static long	com_sun_squawk_Klass$staticFieldsSize The offset of the 'staticFieldsSize' field in com.sun.squawk.Klass.
static long	com_sun_squawk_Klass$staticMethods The offset of the 'staticMethods' field in com.sun.squawk.Klass.
static long	com_sun_squawk_Klass$superType The offset of the 'superType' field in com.sun.squawk.Klass.
static long	com_sun_squawk_Klass$virtualMethods The offset of the 'virtualMethods' field in com.sun.squawk.Klass and com.sun.squawk.ObjectAssociation.
static long	com_sun_squawk_KlassMetadata$classTable The offset of the 'classTable' field in com.sun.squawk.KlassMetadata.
static long	com_sun_squawk_KlassMetadata$definedClass The offset of the 'definedClass' field in com.sun.squawk.KlassMetadata.
static long	com_sun_squawk_KlassMetadata$symbols The offset of the 'definedClass' field in com.sun.squawk.KlassMetadata.
static long	com_sun_squawk_ObjectAssociation$klass
static long	com_sun_squawk_ObjectAssociation$virtualMethods
static long	com_sun_squawk_Suite$classes The offset of the 'classes' field in com.sun.squawk.Suite.
static long	com_sun_squawk_Suite$metadatas The offset of the 'metadatas' field in com.sun.squawk.Suite.
static long	com_sun_squawk_Suite$name The offset of the 'name' field in com.sun.squawk.Suite.
static long	com_sun_squawk_util_SquawkHashtable$entryTable The offset of the 'entryTable' field in com.sun.squawk.util.SquawkHashtable.
static long	com_sun_squawk_VMThread$isolate The offset of the 'isolate' field in com.sun.squawk.VMThread.
static long	com_sun_squawk_VMThread$stack The offset of the 'stack' field in com.sun.squawk.VMThread.
static long	com_sun_squawk_VMThread$stackSize The offset of the 'stackSize' field in com.sun.squawk.VMThread.
static long	java_lang_Class$klass The offset of the 'vmThread' field in java.lang.Thread.
static long	java_lang_Thread$target The offset of the 'target' field in java.lang.Thread.
static long	java_lang_Thread$vmThread The offset of the 'vmThread' field in java.lang.Thread.
static long	java_lang_Throwable$trace The offset of the 'trace' field in java.lang.Throwable.

Method Summary

static int	decodeOffset(long fieldDesc) Decodes a field's offset from a given field descriptor.
static int	decodeSystemID(long fieldDesc) Decodes a field's type from a given field descriptor.

Methods inherited from class java.lang.Object

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

Field Detail

com_sun_squawk_Klass$self

public static final long com_sun_squawk_Klass$self

The offset of the 'self' field in in com.sun.squawk.Klass and the 'klass' field com.sun.squawk.ObjectAssociation which must be identical.

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Constant Field Values

com_sun_squawk_ObjectAssociation$klass

public static final long com_sun_squawk_ObjectAssociation$klass

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Constant Field Values

com_sun_squawk_Klass$virtualMethods

public static final long com_sun_squawk_Klass$virtualMethods

The offset of the 'virtualMethods' field in com.sun.squawk.Klass and com.sun.squawk.ObjectAssociation. which must be identical.

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Constant Field Values

com_sun_squawk_ObjectAssociation$virtualMethods

public static final long com_sun_squawk_ObjectAssociation$virtualMethods

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Constant Field Values

com_sun_squawk_Klass$staticMethods

public static final long com_sun_squawk_Klass$staticMethods

The offset of the 'staticMethods' field in com.sun.squawk.Klass.

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Constant Field Values

com_sun_squawk_Klass$name

public static final long com_sun_squawk_Klass$name

The offset of the 'name' field in com.sun.squawk.Klass.

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Constant Field Values

com_sun_squawk_Klass$componentType

public static final long com_sun_squawk_Klass$componentType

The offset of the 'componentType' field in com.sun.squawk.Klass.

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Constant Field Values

com_sun_squawk_Klass$superType

public static final long com_sun_squawk_Klass$superType

The offset of the 'superType' field in com.sun.squawk.Klass.

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Constant Field Values

com_sun_squawk_Klass$interfaces

public static final long com_sun_squawk_Klass$interfaces

The offset of the 'superType' field in com.sun.squawk.Klass.

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Constant Field Values

com_sun_squawk_Klass$objects

public static final long com_sun_squawk_Klass$objects

The offset of the 'objects' field in com.sun.squawk.Klass.

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Constant Field Values

com_sun_squawk_Klass$oopMap

public static final long com_sun_squawk_Klass$oopMap

The offset of the 'oopMap' field in com.sun.squawk.Klass.

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Constant Field Values

com_sun_squawk_Klass$oopMapWord

public static final long com_sun_squawk_Klass$oopMapWord

The offset of the 'oopMapWord' field in com.sun.squawk.Klass.

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Constant Field Values

com_sun_squawk_Klass$dataMap

public static final long com_sun_squawk_Klass$dataMap

The offset of the 'dataMap' field in com.sun.squawk.Klass.

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Constant Field Values

com_sun_squawk_Klass$dataMapWord

public static final long com_sun_squawk_Klass$dataMapWord

The offset of the 'dataMapWord' field in com.sun.squawk.Klass.

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Constant Field Values

com_sun_squawk_Klass$modifiers

public static final long com_sun_squawk_Klass$modifiers

The offset of the 'modifiers' field in com.sun.squawk.Klass.

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Constant Field Values

com_sun_squawk_Klass$dataMapLength

public static final long com_sun_squawk_Klass$dataMapLength

The offset of the 'dataMapLength' field in com.sun.squawk.Klass.

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Constant Field Values

com_sun_squawk_Klass$id

public static final long com_sun_squawk_Klass$id

The offset of the 'id' field in com.sun.squawk.Klass.

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Constant Field Values

com_sun_squawk_Klass$instanceSizeBytes

public static final long com_sun_squawk_Klass$instanceSizeBytes

The offset of the 'instanceSizeBytes' field in com.sun.squawk.Klass.

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Constant Field Values

com_sun_squawk_Klass$staticFieldsSize

public static final long com_sun_squawk_Klass$staticFieldsSize

The offset of the 'staticFieldsSize' field in com.sun.squawk.Klass.

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Constant Field Values

com_sun_squawk_Klass$refStaticFieldsSize

public static final long com_sun_squawk_Klass$refStaticFieldsSize

The offset of the 'refStaticFieldsSize' field in com.sun.squawk.Klass.

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Constant Field Values

com_sun_squawk_Klass$indexForInit

public static final long com_sun_squawk_Klass$indexForInit

The offset of the 'indexForInit' field in com.sun.squawk.Klass.

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Constant Field Values

com_sun_squawk_Klass$indexForClinit

public static final long com_sun_squawk_Klass$indexForClinit

The offset of the 'indexForClinit' field in com.sun.squawk.Klass.

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Constant Field Values

com_sun_squawk_Klass$indexForMain

public static final long com_sun_squawk_Klass$indexForMain

The offset of the 'indexForMain' field in com.sun.squawk.Klass.

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Constant Field Values

com_sun_squawk_Klass$state

public static final long com_sun_squawk_Klass$state

The offset of the 'state' field in com.sun.squawk.Klass.

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Constant Field Values

com_sun_squawk_Klass$initModifiers

public static final long com_sun_squawk_Klass$initModifiers

The offset of the 'initModifiers' field in com.sun.squawk.Klass.

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Constant Field Values

com_sun_squawk_Klass$mustClinit

public static final long com_sun_squawk_Klass$mustClinit

The offset of the 'mustClinit' field in com.sun.squawk.Klass.

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Constant Field Values

com_sun_squawk_util_SquawkHashtable$entryTable

public static final long com_sun_squawk_util_SquawkHashtable$entryTable

The offset of the 'entryTable' field in com.sun.squawk.util.SquawkHashtable.

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Constant Field Values

java_lang_Thread$vmThread

public static final long java_lang_Thread$vmThread

The offset of the 'vmThread' field in java.lang.Thread.

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Constant Field Values

java_lang_Thread$target

public static final long java_lang_Thread$target

The offset of the 'target' field in java.lang.Thread.

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Constant Field Values

java_lang_Class$klass

public static final long java_lang_Class$klass

The offset of the 'vmThread' field in java.lang.Thread.

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Constant Field Values

com_sun_squawk_VMThread$isolate

public static final long com_sun_squawk_VMThread$isolate

The offset of the 'isolate' field in com.sun.squawk.VMThread.

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Constant Field Values

com_sun_squawk_VMThread$stack

public static final long com_sun_squawk_VMThread$stack

The offset of the 'stack' field in com.sun.squawk.VMThread.

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Constant Field Values

com_sun_squawk_VMThread$stackSize

public static final long com_sun_squawk_VMThread$stackSize

The offset of the 'stackSize' field in com.sun.squawk.VMThread.

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Constant Field Values

com_sun_squawk_Isolate$savedStackChunks

public static final long com_sun_squawk_Isolate$savedStackChunks

The offset of the 'savedStackChunks' field in com.sun.squawk.Isolate.

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Constant Field Values

java_lang_Throwable$trace

public static final long java_lang_Throwable$trace

The offset of the 'trace' field in java.lang.Throwable. Used by VM.printVMStackTrace()..

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Constant Field Values

com_sun_squawk_Suite$classes

public static final long com_sun_squawk_Suite$classes

The offset of the 'classes' field in com.sun.squawk.Suite. Used by com.sun.squawk.ObjectGraphLoader of the Romizer.

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Constant Field Values

com_sun_squawk_Suite$name

public static final long com_sun_squawk_Suite$name

The offset of the 'name' field in com.sun.squawk.Suite. Used by com.sun.squawk.ObjectGraphLoader of the Romizer.

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Constant Field Values

com_sun_squawk_Suite$metadatas

public static final long com_sun_squawk_Suite$metadatas

The offset of the 'metadatas' field in com.sun.squawk.Suite. Used by com.sun.squawk.ObjectGraphLoader of the Romizer.

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Constant Field Values

com_sun_squawk_KlassMetadata$definedClass

public static final long com_sun_squawk_KlassMetadata$definedClass

The offset of the 'definedClass' field in com.sun.squawk.KlassMetadata. Used by com.sun.squawk.ObjectGraphLoader of the Romizer.

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Constant Field Values

com_sun_squawk_KlassMetadata$symbols

public static final long com_sun_squawk_KlassMetadata$symbols

The offset of the 'definedClass' field in com.sun.squawk.KlassMetadata. Used by com.sun.squawk.ObjectGraphLoader of the Romizer.

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Constant Field Values

com_sun_squawk_KlassMetadata$classTable

public static final long com_sun_squawk_KlassMetadata$classTable

The offset of the 'classTable' field in com.sun.squawk.KlassMetadata. Used by com.sun.squawk.ObjectGraphLoader of the Romizer.

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Constant Field Values

Method Detail

decodeSystemID

public static int decodeSystemID(long fieldDesc)

Decodes a field's type from a given field descriptor.

Parameters:

fieldDesc - an encoded field descriptor

Returns:

the system ID of the type encoded in fieldDesc

decodeOffset

public static int decodeOffset(long fieldDesc)

Decodes a field's offset from a given field descriptor.

Parameters:

fieldDesc - an encoded field descriptor

Returns:

the offset encoded in fieldDesc. This is equivalent to (int)field