com.sun.squawk.vm
Class SC

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

public class SC
extends Object

This class contains the offsets that define that define the layout of the array (of type "[-local-") that implements a stack for a thread.

Field Summary

static int	guard This is a word that is always unused.
static int	lastBCI The bytecode index of the next instruction to be executed in the inner most activation frame's method.
static int	lastFP The pointer to the inner most activation frame in the stack.
static int	limit The offset of the stack limit (i.e.
static int	next The index of the pointer to the next stack chunk in a list of stack chunks.
static int	owner The index of the pointer to the VMThread instance that owns this chunk.

Constructor Summary

SC()

Method Summary

Methods inherited from class java.lang.Object

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

Field Detail

next

public static final int next

The index of the pointer to the next stack chunk in a list of stack chunks. This is only used by a generational collector.

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Constant Field Values

owner

public static final int owner

The index of the pointer to the VMThread instance that owns this chunk.

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Constant Field Values

lastFP

public static final int lastFP

The pointer to the inner most activation frame in the stack.

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Constant Field Values

lastBCI

public static final int lastBCI

The bytecode index of the next instruction to be executed in the inner most activation frame's method.

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Constant Field Values

guard

public static final int guard

This is a word that is always unused. If this word is ever non-zero then an overflow of the stack has occurred.

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Constant Field Values

limit

public static final int limit

The offset of the stack limit (i.e. the last slot that can be used without overwriting one of the header slots defined above). : : | parmN | 8 +------------------+ + | returnIP | 7 | +------------------+ | | returnFP | 6 } FIXED_FRAME_SIZE +------------------+ | sl -->| MP | 5 | +==================+ + | guard | 4 +------------------+ | lastBCI | 3 +------------------+ | lastFP | 2 +------------------+ | owner | 1 +------------------+ | next | 0 +------------------+

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Constant Field Values

Constructor Detail

SC

public SC()