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Allocator
Class SimpleAllocator  

java.lang.Object
  Allocator.HeapAllocator
      Allocator.SimpleAllocator

All Implemented Interfaces:

Clazz.jq_ClassFileConstants

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public class SimpleAllocator

extends HeapAllocator

SimpleAllocator

Version:

$Id: SimpleAllocator.java,v 1.30 2003/05/12 10:04:52 joewhaley Exp $

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Nested Class Summary

 

Nested classes inherited from class Allocator.HeapAllocator

HeapAllocator.HeapPointer

 

Field Summary
static Clazz.jq_InstanceMethod	_allocateArray
static Clazz.jq_InstanceMethod	_allocateArrayAlign8
static Clazz.jq_InstanceMethod	_allocateObject
static Clazz.jq_InstanceMethod	_allocateObjectAlign8
static Clazz.jq_Class	_class
static int	BLOCK_SIZE           Size of blocks allocated from the OS.
private  GC.GCBits	gcBits           GC information for the current block.
private  Memory.HeapAddress	heapCurrent           Pointers to the start, current, and end of the heap.
private  Memory.HeapAddress	heapEnd           Pointers to the start, current, and end of the heap.
private  Memory.HeapAddress	heapFirst           Pointers to the start, current, and end of the heap.
static int	LARGE_THRESHOLD           Threshold for direct OS allocation.
static int	MAX_MEMORY           Maximum memory, in bytes, to be allocated from the OS.

 

Fields inherited from class Allocator.HeapAllocator

_clsinitAndAllocateObject

 

Fields inherited from interface Clazz.jq_ClassFileConstants

ACC_ABSTRACT, ACC_FINAL, ACC_INTERFACE, ACC_NATIVE, ACC_PRIVATE, ACC_PROTECTED, ACC_PUBLIC, ACC_STATIC, ACC_STRICT, ACC_SUPER, ACC_SYNCHRONIZED, ACC_TRANSIENT, ACC_VOLATILE, CONSTANT_Class, CONSTANT_Double, CONSTANT_FieldRef, CONSTANT_Float, CONSTANT_Integer, CONSTANT_InterfaceMethodRef, CONSTANT_Long, CONSTANT_MethodRef, CONSTANT_NameAndType, CONSTANT_ResolvedClass, CONSTANT_ResolvedIFieldRef, CONSTANT_ResolvedIMethodRef, CONSTANT_ResolvedSFieldRef, CONSTANT_ResolvedSMethodRef, CONSTANT_String, CONSTANT_Utf8, CONSUME_STACK, ILLEGAL_OPCODE, ILLEGAL_TYPE, jbc_AALOAD, jbc_AASTORE, jbc_ACONST_NULL, jbc_ALOAD, jbc_ALOAD_0, jbc_ALOAD_1, jbc_ALOAD_2, jbc_ALOAD_3, jbc_ANEWARRAY, jbc_ARETURN, jbc_ARRAYLENGTH, jbc_ASTORE, jbc_ASTORE_0, jbc_ASTORE_1, jbc_ASTORE_2, jbc_ASTORE_3, jbc_ATHROW, jbc_BALOAD, jbc_BASTORE, jbc_BIPUSH, jbc_BREAKPOINT, jbc_CALOAD, jbc_CASTORE, jbc_CHECKCAST, jbc_D2F, jbc_D2I, jbc_D2L, jbc_DADD, jbc_DALOAD, jbc_DASTORE, jbc_DCMPG, jbc_DCMPL, jbc_DCONST_0, jbc_DCONST_1, jbc_DDIV, jbc_DLOAD, jbc_DLOAD_0, jbc_DLOAD_1, jbc_DLOAD_2, jbc_DLOAD_3, jbc_DMUL, jbc_DNEG, jbc_DREM, jbc_DRETURN, jbc_DSTORE, jbc_DSTORE_0, jbc_DSTORE_1, jbc_DSTORE_2, jbc_DSTORE_3, jbc_DSUB, jbc_DUP, jbc_DUP_X1, jbc_DUP_X2, jbc_DUP2, jbc_DUP2_X1, jbc_DUP2_X2, jbc_F2D, jbc_F2I, jbc_F2L, jbc_FADD, jbc_FALOAD, jbc_FASTORE, jbc_FCMPG, jbc_FCMPL, jbc_FCONST_0, jbc_FCONST_1, jbc_FCONST_2, jbc_FDIV, jbc_FLOAD, jbc_FLOAD_0, jbc_FLOAD_1, jbc_FLOAD_2, jbc_FLOAD_3, jbc_FMUL, jbc_FNEG, jbc_FREM, jbc_FRETURN, jbc_FSTORE, jbc_FSTORE_0, jbc_FSTORE_1, jbc_FSTORE_2, jbc_FSTORE_3, jbc_FSUB, jbc_GETFIELD, jbc_GETSTATIC, jbc_GOTO, jbc_GOTO_W, jbc_I2B, jbc_I2C, jbc_I2D, jbc_I2F, jbc_I2L, jbc_I2S, jbc_IADD, jbc_IALOAD, jbc_IAND, jbc_IASTORE, jbc_ICONST_0, jbc_ICONST_1, jbc_ICONST_2, jbc_ICONST_3, jbc_ICONST_4, jbc_ICONST_5, jbc_ICONST_M1, jbc_IDIV, jbc_IF_ACMPEQ, jbc_IF_ACMPNE, jbc_IF_ICMPEQ, jbc_IF_ICMPGE, jbc_IF_ICMPGT, jbc_IF_ICMPLE, jbc_IF_ICMPLT, jbc_IF_ICMPNE, jbc_IFEQ, jbc_IFGE, jbc_IFGT, jbc_IFLE, jbc_IFLT, jbc_IFNE, jbc_IFNONNULL, jbc_IFNULL, jbc_IINC, jbc_ILOAD, jbc_ILOAD_0, jbc_ILOAD_1, jbc_ILOAD_2, jbc_ILOAD_3, jbc_IMUL, jbc_INEG, jbc_INSTANCEOF, jbc_INT2BYTE, jbc_INT2CHAR, jbc_INT2SHORT, jbc_INVOKEINTERFACE, jbc_INVOKENONVIRTUAL, jbc_INVOKESPECIAL, jbc_INVOKESTATIC, jbc_INVOKEVIRTUAL, jbc_IOR, jbc_IREM, jbc_IRETURN, jbc_ISHL, jbc_ISHR, jbc_ISTORE, jbc_ISTORE_0, jbc_ISTORE_1, jbc_ISTORE_2, jbc_ISTORE_3, jbc_ISUB, jbc_IUSHR, jbc_IXOR, jbc_JSR, jbc_JSR_W, jbc_L2D, jbc_L2F, jbc_L2I, jbc_LADD, jbc_LALOAD, jbc_LAND, jbc_LASTORE, jbc_LCMP, jbc_LCONST_0, jbc_LCONST_1, jbc_LDC, jbc_LDC_W, jbc_LDC2_W, jbc_LDIV, jbc_LLOAD, jbc_LLOAD_0, jbc_LLOAD_1, jbc_LLOAD_2, jbc_LLOAD_3, jbc_LMUL, jbc_LNEG, jbc_LOOKUPSWITCH, jbc_LOR, jbc_LREM, jbc_LRETURN, jbc_LSHL, jbc_LSHR, jbc_LSTORE, jbc_LSTORE_0, jbc_LSTORE_1, jbc_LSTORE_2, jbc_LSTORE_3, jbc_LSUB, jbc_LUSHR, jbc_LXOR, jbc_MONITORENTER, jbc_MONITOREXIT, jbc_MULTIANEWARRAY, jbc_NEW, jbc_NEWARRAY, jbc_NOP, jbc_POP, jbc_POP2, jbc_PUTFIELD, jbc_PUTSTATIC, jbc_RET, jbc_RETURN, jbc_SALOAD, jbc_SASTORE, jbc_SIPUSH, jbc_SWAP, jbc_TABLESWITCH, jbc_WIDE, NO_OF_OPERANDS, OPCODE_NAMES, PRODUCE_STACK, RESERVED, STATE_CLSINITERROR, STATE_CLSINITIALIZED, STATE_CLSINITIALIZING, STATE_CLSINITRUNNING, STATE_COMPILED, STATE_COMPILING, STATE_LOADED, STATE_LOADERROR, STATE_LOADING1, STATE_LOADING2, STATE_LOADING3, STATE_PREPARED, STATE_PREPARING, STATE_SFINITIALIZED, STATE_SFINITIALIZING, STATE_UNLOADED, STATE_VERIFIED, STATE_VERIFYING, T_BOOLEAN, T_BYTE, T_CHAR, T_DOUBLE, T_FLOAT, T_INT, T_LONG, T_SHORT, TC_ARRAY, TC_BOOLEAN, TC_BYTE, TC_CHAR, TC_CLASS, TC_CLASSEND, TC_DOUBLE, TC_FLOAT, TC_INT, TC_LONG, TC_PARAM, TC_PARAMEND, TC_SHORT, TC_VOID, TYPE_OF_OPERANDS, UNDEFINED, UNPREDICTABLE

 

Constructor Summary

SimpleAllocator()

 

Method Summary
java.lang.Object	allocateArray(int length, int size, java.lang.Object vtable)           Allocate an array with the default alignment.
java.lang.Object	allocateArrayAlign8(int length, int size, java.lang.Object vtable)           Allocate an array such that the elements are 8-byte aligned.
private  void	allocateNewBlock()           Allocates a new block of memory from the OS, sets the current block to point to it, makes the new block the current block, and allocates and installs the GC structures.
java.lang.Object	allocateObject(int size, java.lang.Object vtable)           Allocate an object with the default alignment.
java.lang.Object	allocateObjectAlign8(int size, java.lang.Object vtable)           Allocate an object such that the first field is 8-byte aligned.
void	collect()           Initiate a garbage collection.
int	freeMemory()           Returns an estimate of the amount of free memory available.
void	init()           Perform initialization for this allocator.
private  void	installGCBits()           Allocates and installs the GC structures for the current block.
void	processPtrField(Memory.Address a)           Process a reference to a heap object during garbage collection.
int	totalMemory()           Returns an estimate of the total memory allocated (both used and unused).

 

Methods inherited from class Allocator.HeapAllocator

clone, clsinitAndAllocateObject, heapExhausted, outOfMemory

 

Methods inherited from class java.lang.Object

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

 

Field Detail

BLOCK_SIZE

public static final int BLOCK_SIZE

Size of blocks allocated from the OS.

See Also:

Constant Field Values

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MAX_MEMORY

public static int MAX_MEMORY

Maximum memory, in bytes, to be allocated from the OS.

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LARGE_THRESHOLD

public static final int LARGE_THRESHOLD

Threshold for direct OS allocation. When an array overflows the current block and is larger than this size, it is allocated directly from the OS.

See Also:

Constant Field Values

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heapFirst

private Memory.HeapAddress heapFirst

Pointers to the start, current, and end of the heap.

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heapCurrent

private Memory.HeapAddress heapCurrent

Pointers to the start, current, and end of the heap.

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heapEnd

private Memory.HeapAddress heapEnd

Pointers to the start, current, and end of the heap.

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gcBits

private GC.GCBits gcBits

GC information for the current block.

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_class

public static final Clazz.jq_Class _class

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_allocateObject

public static final Clazz.jq_InstanceMethod _allocateObject

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_allocateObjectAlign8

public static final Clazz.jq_InstanceMethod _allocateObjectAlign8

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_allocateArray

public static final Clazz.jq_InstanceMethod _allocateArray

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_allocateArrayAlign8

public static final Clazz.jq_InstanceMethod _allocateArrayAlign8

Constructor Detail

SimpleAllocator

public SimpleAllocator()

Method Detail

init

public final void init()
                throws java.lang.OutOfMemoryError

Perform initialization for this allocator. This will be called before any other methods. This allocates an initial block of memory from the OS and sets up relevant pointers.

Specified by:

init in class HeapAllocator

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allocateNewBlock

private void allocateNewBlock()

Allocates a new block of memory from the OS, sets the current block to point to it, makes the new block the current block, and allocates and installs the GC structures.

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installGCBits

private void installGCBits()

Allocates and installs the GC structures for the current block.

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freeMemory

public final int freeMemory()

Returns an estimate of the amount of free memory available.

Specified by:

freeMemory in class HeapAllocator

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totalMemory

public final int totalMemory()

Returns an estimate of the total memory allocated (both used and unused).

Specified by:

totalMemory in class HeapAllocator

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allocateObject

public final java.lang.Object allocateObject(int size,
                                             java.lang.Object vtable)
                                      throws java.lang.OutOfMemoryError

Allocate an object with the default alignment. If the object cannot be allocated due to lack of memory, throws OutOfMemoryError.

Specified by:

allocateObject in class HeapAllocator

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allocateObjectAlign8

public final java.lang.Object allocateObjectAlign8(int size,
                                                   java.lang.Object vtable)
                                            throws java.lang.OutOfMemoryError

Allocate an object such that the first field is 8-byte aligned. If the object cannot be allocated due to lack of memory, throws OutOfMemoryError.

Specified by:

allocateObjectAlign8 in class HeapAllocator

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allocateArray

public final java.lang.Object allocateArray(int length,
                                            int size,
                                            java.lang.Object vtable)
                                     throws java.lang.OutOfMemoryError,
                                            java.lang.NegativeArraySizeException

Allocate an array with the default alignment. If length is negative, throws NegativeArraySizeException. If the array cannot be allocated due to lack of memory, throws OutOfMemoryError.

Specified by:

allocateArray in class HeapAllocator

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allocateArrayAlign8

public final java.lang.Object allocateArrayAlign8(int length,
                                                  int size,
                                                  java.lang.Object vtable)
                                           throws java.lang.OutOfMemoryError,
                                                  java.lang.NegativeArraySizeException

Allocate an array such that the elements are 8-byte aligned. If length is negative, throws NegativeArraySizeException. If the array cannot be allocated due to lack of memory, throws OutOfMemoryError.

Specified by:

allocateArrayAlign8 in class HeapAllocator

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collect

public final void collect()

Description copied from class: HeapAllocator

Initiate a garbage collection.

Specified by:

collect in class HeapAllocator

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processPtrField

public final void processPtrField(Memory.Address a)

Description copied from class: HeapAllocator

Process a reference to a heap object during garbage collection.

Specified by:

processPtrField in class HeapAllocator

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> [ Allocator overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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