com.sun.squawk.vm
Interface HDR

public interface HDR

This class contains constants that describe the object header layout.

BYTES_PER_WORD

static final int BYTES_PER_WORD

The size (in bytes) of a pointer.

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LOG2_BYTES_PER_WORD

static final int LOG2_BYTES_PER_WORD

The amount by which to right shift a byte offset to find the offset of the word that contains the indexed byte.

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BITS_PER_BYTE

static final int BITS_PER_BYTE

The number of bits per byte.

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BITS_PER_WORD

static final int BITS_PER_WORD

The number of bits in a pointer.

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LOG2_BITS_PER_WORD

static final int LOG2_BITS_PER_WORD

The amount by which to right shift a bit index to yield the word in a bitmap containing the indexed bit.

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LOG2_BITS_PER_BYTE

static final int LOG2_BITS_PER_BYTE

The amount by which to right shift a bit index to yield the byte in a bitmap containing the indexed bit.

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klass

static final int klass

The offset (in words) from an object's address to the class pointer in the object's header.

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length

static final int length

The offset (in words) from an object's address to array length in the object's header.

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methodDefiningClass

static final int methodDefiningClass

The offset (in words) from an method body's address to the defining class pointer in the method body's header.

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methodInfoStart

static final int methodInfoStart

The offset (in bytes) from an method body's address to the start of the info block in the method body's header.

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basicHeaderSize

static final int basicHeaderSize

The size (in bytes) of an object header for a non-array, non-method-body object.

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arrayHeaderSize

static final int arrayHeaderSize

The size (in bytes) of an object header for an array object.

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headerTagBits

static final int headerTagBits

The number of low order bits in the first word of an object header that specify the format of the object header.

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headerTagMask

static final int headerTagMask

The mask that is applied to the first word of an object header to extract the format tag.

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basicHeaderTag

static final int basicHeaderTag

The object header format tag value specifying a non-array, non-method-body object header.

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arrayHeaderTag

static final int arrayHeaderTag

The object header format tag value specifying an array object header.

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methodHeaderTag

static final int methodHeaderTag

The object header format tag value specifying a mehod body object header.

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forwardPointerBit

static final int forwardPointerBit

The bit in a class pointer word that is set if the object has been forwarded.

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