com.oracle.graal.hotspot.replacements

Class MonitorSnippets

java.lang.Object

com.oracle.graal.hotspot.replacements.MonitorSnippets

All Implemented Interfaces:

Snippets

public class MonitorSnippets
extends Object
implements Snippets

Snippets used for implementing the monitorenter and monitorexit instructions. The locking algorithm used is described in the paper Eliminating synchronization-related atomic operations with biased locking and bulk rebiasing by Kenneth Russell and David Detlefs.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	MonitorSnippets.Options
static class	MonitorSnippets.Templates

Field Summary

Fields

Modifier and Type	Field and Description
static boolean	CHECK_BALANCED_MONITORS
private static boolean	ENABLE_BREAKPOINT Leaving the breakpoint code in to provide an example of how to use the BreakpointNode intrinsic.
(package private) static SnippetCounter	lockBiasAcquired
(package private) static SnippetCounter	lockBiasExisting
(package private) static SnippetCounter	lockBiasTransfer
(package private) static SnippetCounter	lockCas
(package private) static SnippetCounter	lockCasRecursive
private static SnippetCounter.Group	lockCounters Counters for the various paths for acquiring a lock.
(package private) static SnippetCounter	lockStubEpochExpired
(package private) static SnippetCounter	lockStubFailedCas
(package private) static SnippetCounter	lockStubRevoke
private static LocationIdentity	MONITOR_COUNTER_LOCATION
static ForeignCallDescriptor	MONITORENTER
static ForeignCallDescriptor	MONITOREXIT
private static boolean	PROFILE_CONTEXT
(package private) static SnippetCounter	revokeBias
private static String	TRACE_METHOD_FILTER Monitor operations in methods whose fully qualified name contains this substring will be traced.
private static String	TRACE_TYPE_FILTER Monitor operations on objects whose type contains this substring will be traced.
(package private) static SnippetCounter	unbiasable
(package private) static SnippetCounter	unlockBias
(package private) static SnippetCounter	unlockCas
(package private) static SnippetCounter	unlockCasRecursive
private static SnippetCounter.Group	unlockCounters Counters for the various paths for releasing a lock.
(package private) static SnippetCounter	unlockStub

Constructor Summary

Constructors

Constructor and Description
MonitorSnippets()

Method Summary

Modifier and Type	Method and Description
(package private) static void	bkpt(Object object, Word mark, Word tmp, Word value)
private static void	checkCounter(String errMsg)
private static void	decCounter()
private static boolean	doProfile()
private static void	incCounter()
private static void	initCounter()
static void	monitorenter(Object object, KlassPointer hub, int lockDepth, Register threadRegister, Register stackPointerRegister, boolean trace)
static void	monitorenterStub(Object object, int lockDepth, boolean trace) Calls straight out to the monitorenter stub.
private static void	monitorenterStubC(ForeignCallDescriptor descriptor, Object object, Word lock)
static void	monitorexit(Object object, int lockDepth, boolean trace)
static void	monitorexitStub(Object object, int lockDepth, boolean trace) Calls straight out to the monitorexit stub.
private static void	monitorexitStubC(ForeignCallDescriptor descriptor, Object object, Word lock)
private static void	trace(boolean enabled, String format, WordBase value)
private static void	traceObject(boolean enabled, String action, Object object, boolean enter)

Methods inherited from class java.lang.Object

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

Field Detail

PROFILE_CONTEXT

private static final boolean PROFILE_CONTEXT

See Also:

Constant Field Values

TRACE_TYPE_FILTER

private static final String TRACE_TYPE_FILTER

Monitor operations on objects whose type contains this substring will be traced.

TRACE_METHOD_FILTER

private static final String TRACE_METHOD_FILTER

Monitor operations in methods whose fully qualified name contains this substring will be traced.

CHECK_BALANCED_MONITORS

public static final boolean CHECK_BALANCED_MONITORS

ENABLE_BREAKPOINT

private static final boolean ENABLE_BREAKPOINT

Leaving the breakpoint code in to provide an example of how to use the BreakpointNode intrinsic.

See Also:

Constant Field Values

MONITOR_COUNTER_LOCATION

private static final LocationIdentity MONITOR_COUNTER_LOCATION

MONITORENTER

public static final ForeignCallDescriptor MONITORENTER

MONITOREXIT

public static final ForeignCallDescriptor MONITOREXIT

lockCounters

private static final SnippetCounter.Group lockCounters

Counters for the various paths for acquiring a lock. The counters whose names start with "lock" are mutually exclusive. The other counters are for paths that may be shared.

lockBiasExisting

static final SnippetCounter lockBiasExisting

lockBiasAcquired

static final SnippetCounter lockBiasAcquired

lockBiasTransfer

static final SnippetCounter lockBiasTransfer

lockCas

static final SnippetCounter lockCas

lockCasRecursive

static final SnippetCounter lockCasRecursive

lockStubEpochExpired

static final SnippetCounter lockStubEpochExpired

lockStubRevoke

static final SnippetCounter lockStubRevoke

lockStubFailedCas

static final SnippetCounter lockStubFailedCas

unbiasable

static final SnippetCounter unbiasable

revokeBias

static final SnippetCounter revokeBias

unlockCounters

private static final SnippetCounter.Group unlockCounters

Counters for the various paths for releasing a lock. The counters whose names start with "unlock" are mutually exclusive. The other counters are for paths that may be shared.

unlockBias

static final SnippetCounter unlockBias

unlockCas

static final SnippetCounter unlockCas

unlockCasRecursive

static final SnippetCounter unlockCasRecursive

unlockStub

static final SnippetCounter unlockStub

Constructor Detail

MonitorSnippets

public MonitorSnippets()

Method Detail

doProfile

private static boolean doProfile()

monitorenter

public static void monitorenter(Object object,
                                KlassPointer hub,
                                int lockDepth,
                                Register threadRegister,
                                Register stackPointerRegister,
                                boolean trace)

monitorenterStub

public static void monitorenterStub(Object object,
                                    int lockDepth,
                                    boolean trace)

Calls straight out to the monitorenter stub.

monitorexit

public static void monitorexit(Object object,
                               int lockDepth,
                               boolean trace)

monitorexitStub

public static void monitorexitStub(Object object,
                                   int lockDepth,
                                   boolean trace)

Calls straight out to the monitorexit stub.

traceObject

private static void traceObject(boolean enabled,
                                String action,
                                Object object,
                                boolean enter)

trace

private static void trace(boolean enabled,
                          String format,
                          WordBase value)

bkpt

static void bkpt(Object object,
                 Word mark,
                 Word tmp,
                 Word value)

incCounter

private static void incCounter()

decCounter

private static void decCounter()

initCounter

private static void initCounter()

checkCounter

private static void checkCounter(String errMsg)

monitorenterStubC

private static void monitorenterStubC(ForeignCallDescriptor descriptor,
                                      Object object,
                                      Word lock)

monitorexitStubC

private static void monitorexitStubC(ForeignCallDescriptor descriptor,
                                     Object object,
                                     Word lock)