Class HotSpotOptimizedCallTarget

java.lang.Object

com.oracle.truffle.runtime.OptimizedCallTarget

com.oracle.truffle.runtime.hotspot.HotSpotOptimizedCallTarget

All Implemented Interfaces:

com.oracle.truffle.api.CallTarget, com.oracle.truffle.api.ReplaceObserver, com.oracle.truffle.api.RootCallTarget, com.oracle.truffle.compiler.TruffleCompilable

public final class HotSpotOptimizedCallTarget
extends OptimizedCallTarget

A HotSpot specific OptimizedCallTarget whose machine code (if any) is represented by an associated InstalledCode.

Nested Class Summary

Nested classes/interfaces inherited from class OptimizedCallTarget

OptimizedCallTarget.ArgumentsProfile, OptimizedCallTarget.ReturnProfile

Field Summary

Fields inherited from class OptimizedCallTarget

engine, id, initialized, speculationLog

Constructor Summary

Constructors

Constructor	Description
HotSpotOptimizedCallTarget(EngineData engine)
HotSpotOptimizedCallTarget(OptimizedCallTarget sourceCallTarget, com.oracle.truffle.api.nodes.RootNode rootNode)

Method Summary

Modifier and Type	Method	Description
long	getCodeAddress()	Gets the address of the machine code for this call target.
jdk.vm.ci.meta.SpeculationLog	getCompilationSpeculationLog()
boolean	isValid()	Determines if this call target has valid machine code that can be entered attached to it.
boolean	isValidLastTier()	Determines if this call target has valid machine code attached to it, and that this code was compiled in the last tier.
protected void	notifyDeoptimized(com.oracle.truffle.api.frame.VirtualFrame frame)
boolean	prepareForCompilation(boolean rootCompilation, int compilationTier, boolean lastTier)	When running as part of HotSpot we should pay special attention to CallTargets (CTs) that have been flushed from the code cache because they were cold (According to Code Cache's heuristics).
void	setInstalledCode(jdk.vm.ci.code.InstalledCode code)	This method may only be called during compilation, and only by the compiling thread.

Methods inherited from class OptimizedCallTarget

accept, asJavaConstant, call, call, callBoundary, callDirect, callIndirect, callInlined, callOSR, canBeInlined, cancelCompilation, compile, computeBlockCompilations, countDirectCallNodes, createFrame, dequeueInlined, doInvoke, engineId, ensureInitialized, equals, getCallAndLoopCount, getCallCount, getCallSiteForSplit, getCompilerOptions, getDebugProperties, getInitializedArgumentsProfile, getInitializedReturnProfile, getInitializedTimestamp, getKnownCallSiteCount, getName, getNonTrivialNodeCount, getOptionValue, getOptionValues, getRootNode, getSingleCallNode, getSourceCallTarget, getSpeculationLog, getSuccessfulCompilationCount, hashCode, highestCompiledTier, invalidate, isInitialized, isSameOrSplit, isSingleCaller, isSourceCallTarget, isSplit, isSubmittedForCompilation, isTrivial, log, maybeWaitForTask, needsCompile, nodeReplaced, onCompilationFailed, onCompilationSuccess, onInvalidate, prepareForAOT, profiledPERoot, resetCompilationProfile, resetNeedsSplit, runtime, scaledThreshold, shouldCompile, toString, waitForCompilation, wasExecuted

Methods inherited from class Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Details

HotSpotOptimizedCallTarget

public HotSpotOptimizedCallTarget(OptimizedCallTarget sourceCallTarget,
 com.oracle.truffle.api.nodes.RootNode rootNode)

HotSpotOptimizedCallTarget

public HotSpotOptimizedCallTarget(EngineData engine)

Method Details

setInstalledCode

public void setInstalledCode(jdk.vm.ci.code.InstalledCode code)

This method may only be called during compilation, and only by the compiling thread.

isValid

public boolean isValid()

Description copied from class: OptimizedCallTarget

Determines if this call target has valid machine code that can be entered attached to it.

Specified by:

isValid in class OptimizedCallTarget

isValidLastTier

public boolean isValidLastTier()

Description copied from class: OptimizedCallTarget

Determines if this call target has valid machine code attached to it, and that this code was compiled in the last tier.

Specified by:

isValidLastTier in class OptimizedCallTarget

getCodeAddress

public long getCodeAddress()

Description copied from class: OptimizedCallTarget

Gets the address of the machine code for this call target. A non-zero return value denotes the contiguous memory block containing the machine code but does not necessarily represent an entry point for the machine code or even the address of executable instructions. This value is only for informational purposes (e.g., use in a log message).

Specified by:

getCodeAddress in class OptimizedCallTarget

getCompilationSpeculationLog

public jdk.vm.ci.meta.SpeculationLog getCompilationSpeculationLog()

notifyDeoptimized

protected void notifyDeoptimized(com.oracle.truffle.api.frame.VirtualFrame frame)

Overrides:

notifyDeoptimized in class OptimizedCallTarget

prepareForCompilation

public boolean prepareForCompilation(boolean rootCompilation,
 int compilationTier,
 boolean lastTier)

When running as part of HotSpot we should pay special attention to CallTargets (CTs) that have been flushed from the code cache because they were cold (According to Code Cache's heuristics). Truffle's CallTargets' Profile counter don't decay. For that reason, we need special handling for cold (according to code cache heuristics) CTs that were flushed from the code cache. Otherwise, we can enter a recompilation cycle because Truffle will always see the method as hot (because the profile counters never reset). To handle this case we reset the CT profile whenever its prior compilation was invalidated because it was cold.

Specified by:

prepareForCompilation in interface com.oracle.truffle.compiler.TruffleCompilable

Overrides:

prepareForCompilation in class OptimizedCallTarget