com.oracle.graal.hotspot.stubs

Class NewInstanceStub

java.lang.Object

com.oracle.graal.hotspot.stubs.Stub

com.oracle.graal.hotspot.stubs.SnippetStub

com.oracle.graal.hotspot.stubs.NewInstanceStub

All Implemented Interfaces:

Snippets

public class NewInstanceStub
extends SnippetStub

Stub implementing the fast path for TLAB refill during instance class allocation. This stub is called from the inline allocation code when TLAB allocation fails. If this stub fails to refill the TLAB or allocate the object, it calls out to the HotSpot C++ runtime for to complete the allocation.

Field Summary

Fields

Modifier and Type	Field and Description
static ForeignCallDescriptor	NEW_INSTANCE_C

Fields inherited from class com.oracle.graal.hotspot.stubs.SnippetStub

method, SnippetGraphUnderConstruction

Fields inherited from class com.oracle.graal.hotspot.stubs.Stub

code, compResult, linkage, providers

Constructor Summary

Constructors

Constructor and Description
NewInstanceStub(HotSpotProviders providers, HotSpotForeignCallLinkage linkage)

Method Summary

Modifier and Type	Method and Description
private static Word	allocate(Word thread, int size)
static Word	edenAllocate(Word sizeInBytes, boolean log) Attempts to allocate a chunk of memory from Eden space.
private static boolean	forceSlowPath()
private static boolean	logging()
protected Object[]	makeConstArgs()
private static Object	newInstance(KlassPointer hub, KlassPointer intArrayHub, Register threadRegister) Re-attempts allocation after an initial TLAB allocation failed or was skipped (e.g., due to -XX:-UseTLAB).
static void	newInstanceC(ForeignCallDescriptor newInstanceC, Word thread, KlassPointer hub)
(package private) static Word	refillAllocate(Word thread, KlassPointer intArrayHub, int sizeInBytes, boolean log) Attempts to refill the current thread's TLAB and retries the allocation.

Methods inherited from class com.oracle.graal.hotspot.stubs.SnippetStub

checkConstArg, debugScopeContext, getConstantParameterValue, getGraph, getInstalledCodeOwner, toString

Methods inherited from class com.oracle.graal.hotspot.stubs.Stub

getCode, getCompilationResult, getDestroyedRegisters, getLinkage, getRegisterConfig, getStubs, initDestroyedRegisters, preservesRegisters

Methods inherited from class java.lang.Object

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

Field Detail

NEW_INSTANCE_C

public static final ForeignCallDescriptor NEW_INSTANCE_C

Constructor Detail

NewInstanceStub

public NewInstanceStub(HotSpotProviders providers,
                       HotSpotForeignCallLinkage linkage)

Method Detail

makeConstArgs

protected Object[] makeConstArgs()

Overrides:

makeConstArgs in class SnippetStub

allocate

private static Word allocate(Word thread,
                             int size)

logging

private static boolean logging()

newInstance

private static Object newInstance(KlassPointer hub,
                                  KlassPointer intArrayHub,
                                  Register threadRegister)

Re-attempts allocation after an initial TLAB allocation failed or was skipped (e.g., due to -XX:-UseTLAB).

Parameters:

hub - the hub of the object to be allocated

intArrayHub - the hub for int[].class

refillAllocate

static Word refillAllocate(Word thread,
                           KlassPointer intArrayHub,
                           int sizeInBytes,
                           boolean log)

Attempts to refill the current thread's TLAB and retries the allocation.

Parameters:

intArrayHub - the hub for int[].class

sizeInBytes - the size of the allocation

log - specifies if logging is enabled

Returns:

the newly allocated, uninitialized chunk of memory, or Word.zero() if the operation was unsuccessful

edenAllocate

public static Word edenAllocate(Word sizeInBytes,
                                boolean log)

Attempts to allocate a chunk of memory from Eden space.

Parameters:

sizeInBytes - the size of the chunk to allocate

log - specifies if logging is enabled

Returns:

the allocated chunk or Word.zero() if allocation fails

forceSlowPath

private static boolean forceSlowPath()

newInstanceC

public static void newInstanceC(ForeignCallDescriptor newInstanceC,
                                Word thread,
                                KlassPointer hub)