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org.mmtk.plan.nogc
Class NoGCMutator

java.lang.Object
  extended by org.mmtk.plan.MutatorContext
      extended by org.mmtk.plan.nogc.NoGCMutator
All Implemented Interfaces:
Constants
public class NoGCMutator
extends MutatorContext

This class implements per-mutator thread behavior and state for the NoGC plan, which simply allocates (without ever collecting until the available space is exhausted.

Specifically, this class defines NoGC mutator-time allocation through a bump pointer (def) and includes stubs for per-mutator thread collection semantics (since there is no collection in this plan, these remain just stubs).

See Also:
NoGC, NoGCCollector, StopTheWorldMutator, MutatorContext

Field Summary
private  ImmortalLocal nogc
           
 
Fields inherited from class org.mmtk.plan.MutatorContext
immortal, lgcode, log, los, nonmove, smcode
 
Fields inherited from interface org.mmtk.utility.Constants
ALIGNMENT_VALUE, ARRAY_ELEMENT, BITS_IN_ADDRESS, BITS_IN_BYTE, BITS_IN_CHAR, BITS_IN_INT, BITS_IN_PAGE, BITS_IN_SHORT, BITS_IN_WORD, BYTES_IN_ADDRESS, BYTES_IN_BYTE, BYTES_IN_CHAR, BYTES_IN_INT, BYTES_IN_KBYTE, BYTES_IN_MBYTE, BYTES_IN_PAGE, BYTES_IN_SHORT, BYTES_IN_WORD, CARD_MASK, CARD_META_PAGES_PER_REGION, INSTANCE_FIELD, LOG_BITS_IN_ADDRESS, LOG_BITS_IN_BYTE, LOG_BITS_IN_CHAR, LOG_BITS_IN_INT, LOG_BITS_IN_PAGE, LOG_BITS_IN_SHORT, LOG_BITS_IN_WORD, LOG_BYTES_IN_ADDRESS, LOG_BYTES_IN_ADDRESS_SPACE, LOG_BYTES_IN_BYTE, LOG_BYTES_IN_CHAR, LOG_BYTES_IN_INT, LOG_BYTES_IN_KBYTE, LOG_BYTES_IN_MBYTE, LOG_BYTES_IN_PAGE, LOG_BYTES_IN_SHORT, LOG_BYTES_IN_WORD, LOG_CARD_BYTES, LOG_CARD_GRAIN, LOG_CARD_META_BYTES, LOG_CARD_META_PAGES, LOG_CARD_META_SIZE, LOG_CARD_UNITS, LOG_MIN_ALIGNMENT, MAX_ALIGNMENT, MAX_BYTES_PADDING, MAX_INT, MIN_ALIGNMENT, MIN_INT, SUPPORT_CARD_SCANNING
 
Constructor Summary
NoGCMutator()
           
 
Method Summary
 Address alloc(int bytes, int align, int offset, int allocator, int site)
          Allocate memory for an object.
 void collectionPhase(short phaseId, boolean primary)
          Perform a per-mutator collection phase.
 Allocator getAllocatorFromSpace(Space space)
          Return the allocator instance associated with a space space, for this plan instance.
 void postAlloc(ObjectReference ref, ObjectReference typeRef, int bytes, int allocator)
          Perform post-allocation actions.
 
Methods inherited from class org.mmtk.plan.MutatorContext
addressBulkCopy, addressRead, addressTryCompareAndSwap, addressWrite, assertRemsetsFlushed, booleanBulkCopy, booleanRead, booleanWrite, byteBulkCopy, byteRead, byteWrite, charBulkCopy, charRead, charWrite, checkAllocator, deinitMutator, doubleBulkCopy, doubleRead, doubleWrite, extentBulkCopy, extentRead, extentWrite, floatBulkCopy, floatRead, floatWrite, flush, flushRememberedSets, getId, getLog, initMutator, intBulkCopy, intRead, intTryCompareAndSwap, intWrite, javaLangReferenceReadBarrier, longBulkCopy, longRead, longTryCompareAndSwap, longWrite, objectReferenceBulkCopy, objectReferenceNonHeapRead, objectReferenceNonHeapWrite, objectReferenceRead, objectReferenceTryCompareAndSwap, objectReferenceWrite, offsetBulkCopy, offsetRead, offsetWrite, shortBulkCopy, shortRead, shortWrite, wordBulkCopy, wordRead, wordTryCompareAndSwap, wordWrite
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

nogc

private final ImmortalLocal nogc
Constructor Detail

NoGCMutator

public NoGCMutator()
Method Detail

alloc

public Address alloc(int bytes,
                     int align,
                     int offset,
                     int allocator,
                     int site)
Allocate memory for an object.

Overrides:
alloc in class MutatorContext
Parameters:
bytes - The number of bytes required for the object.
align - Required alignment for the object.
offset - Offset associated with the alignment.
allocator - The allocator associated with this request.
site - Allocation site
Returns:
The low address of the allocated chunk.

postAlloc

public void postAlloc(ObjectReference ref,
                      ObjectReference typeRef,
                      int bytes,
                      int allocator)
Description copied from class: MutatorContext
Perform post-allocation actions. For many allocators none are required.

Overrides:
postAlloc in class MutatorContext
Parameters:
ref - The newly allocated object
typeRef - the type reference for the instance being created
bytes - The size of the space to be allocated (in bytes)
allocator - The allocator number to be used for this allocation

getAllocatorFromSpace

public Allocator getAllocatorFromSpace(Space space)
Description copied from class: MutatorContext
Return the allocator instance associated with a space space, for this plan instance.

Overrides:
getAllocatorFromSpace in class MutatorContext
Parameters:
space - The space for which the allocator instance is desired.
Returns:
The allocator instance associated with this plan instance which is allocating into space, or null if no appropriate allocator can be established.

collectionPhase

public final void collectionPhase(short phaseId,
                                  boolean primary)
Perform a per-mutator collection phase.

Specified by:
collectionPhase in class MutatorContext
Parameters:
phaseId - The unique phase identifier
primary - Should this thread be used to execute any single-threaded local operations?
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