com.sun.squawk.vm
Class AddressType

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

public final class AddressType
extends Object

This class defines the constants that can be used to describe the type of the value stored at a given address. This type information is used when the VM is built with runtime type checking enabled.

Field Summary

static byte	ANY Denotes that an address that has been zeroed and thus can be safely read as the default value for any type.
static int	ANY_WORD A constant denoting a word full of ANYs.
static byte	BYTE Denotes that an address contains a byte value.
static byte	BYTECODE Denotes that an address contains a bytecode instruction.
static byte	DOUBLE Denotes that an address contains the first word of a double value.
static byte	DOUBLE2 Denotes that an address contains the second word of a double value.
static byte	FLOAT Denotes that an address contains a float value.
static byte	INT Denotes that an address contains an int value.
static byte	LONG Denotes that an address contains the first word of a long value.
static byte	LONG2 Denotes that an address contains the second word of a long value.
static String	Mnemonics A char array (encoded in a string) provided a char representation for each valid address type constant.
static int	MUTATION_TYPE_SHIFT The amount by which an address type value must be right shifted to extract the encoded mutation type.
static byte	REF Denotes that an address contains a reference value.
static byte	SHORT Denotes that an address contains a short value.
static int	TYPE_MASK The mask applied to an address type value to extract the type information without the mutation type information.
static byte	UNDEFINED Denotes that an address that has never been written to or zeroed.
static long	UNDEFINED_WORD A constant denoting a word full of UNDEFINEDs.
static byte	UWORD Denotes that an address contains a word (or offset) value.

Method Summary

static String

getMnemonic(byte type) Gets the mnemonic for an address type value.

Methods inherited from class java.lang.Object

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

Field Detail

UNDEFINED

public static final byte UNDEFINED

Denotes that an address that has never been written to or zeroed.

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Constant Field Values

ANY

public static final byte ANY

Denotes that an address that has been zeroed and thus can be safely read as the default value for any type.

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Constant Field Values

BYTECODE

public static final byte BYTECODE

Denotes that an address contains a bytecode instruction. The high 4 bits of the type entry describe the type of the value that the instruction write to memory (if any).

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Constant Field Values

BYTE

public static final byte BYTE

Denotes that an address contains a byte value.

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Constant Field Values

SHORT

public static final byte SHORT

Denotes that an address contains a short value.

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Constant Field Values

INT

public static final byte INT

Denotes that an address contains an int value.

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Constant Field Values

FLOAT

public static final byte FLOAT

Denotes that an address contains a float value.

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Constant Field Values

LONG

public static final byte LONG

Denotes that an address contains the first word of a long value.

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Constant Field Values

LONG2

public static final byte LONG2

Denotes that an address contains the second word of a long value.

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Constant Field Values

DOUBLE

public static final byte DOUBLE

Denotes that an address contains the first word of a double value.

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Constant Field Values

DOUBLE2

public static final byte DOUBLE2

Denotes that an address contains the second word of a double value.

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Constant Field Values

REF

public static final byte REF

Denotes that an address contains a reference value.

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Constant Field Values

UWORD

public static final byte UWORD

Denotes that an address contains a word (or offset) value.

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Constant Field Values

TYPE_MASK

public static final int TYPE_MASK

The mask applied to an address type value to extract the type information without the mutation type information.

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Constant Field Values

MUTATION_TYPE_SHIFT

public static final int MUTATION_TYPE_SHIFT

The amount by which an address type value must be right shifted to extract the encoded mutation type.

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Constant Field Values

UNDEFINED_WORD

public static final long UNDEFINED_WORD

A constant denoting a word full of UNDEFINEDs.

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Constant Field Values

ANY_WORD

public static final int ANY_WORD

A constant denoting a word full of ANYs.

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Constant Field Values

Mnemonics

public static final String Mnemonics

A char array (encoded in a string) provided a char representation for each valid address type constant.

See Also:

Constant Field Values

Method Detail

getMnemonic

public static String getMnemonic(byte type)

Gets the mnemonic for an address type value.

Parameters:

type - the value to get a mnemonic representation for

Returns:

the representation of 'type'