org.graalvm.compiler.loop.phases

Class ConvertDeoptimizeToGuardPhase

java.lang.Object

org.graalvm.compiler.phases.BasePhase<C>

org.graalvm.compiler.phases.common.PostRunCanonicalizationPhase<CoreProviders>

org.graalvm.compiler.loop.phases.ConvertDeoptimizeToGuardPhase

All Implemented Interfaces:

PhaseSizeContract

public class ConvertDeoptimizeToGuardPhase
extends PostRunCanonicalizationPhase<CoreProviders>

This phase will find branches which always end with a DeoptimizeNode and replace their ControlSplitNodes with FixedGuardNodes. This is useful because FixedGuardNodes will be lowered to GuardNodes which can later be optimized more aggressively than control-flow constructs. This is currently only done for branches that start from a IfNode. If it encounters a branch starting at an other kind of ControlSplitNode, it will only bring the DeoptimizeNode as close to the ControlSplitNode as possible.

Nested Class Summary

Nested classes/interfaces inherited from class org.graalvm.compiler.phases.BasePhase

BasePhase.ApplyScope, BasePhase.BasePhaseStatistics, BasePhase.NotApplicable, BasePhase.PhaseOptions, BasePhase.SharedGlobalPhaseState

Field Summary

Fields inherited from class org.graalvm.compiler.phases.common.PostRunCanonicalizationPhase

canonicalizer

Fields inherited from class org.graalvm.compiler.phases.BasePhase

ALWAYS_APPLICABLE

Constructor Summary

Constructors

Constructor and Description
ConvertDeoptimizeToGuardPhase(CanonicalizerPhase canonicalizer)

Method Summary

Modifier and Type	Method and Description
Optional<BasePhase.NotApplicable>	canApply(GraphState graphState) Checks if all the preconditions to BasePhase.apply(StructuredGraph, Object, boolean) the phase are met.
protected void	run(StructuredGraph graph, CoreProviders context)

Methods inherited from class org.graalvm.compiler.phases.common.PostRunCanonicalizationPhase

applyScope, updateGraphState

Methods inherited from class org.graalvm.compiler.phases.BasePhase

apply, apply, codeSizeIncrease, contractorName, equals, getName, hashCode, mustApply, shouldDumpAfterAtBasicLevel, shouldDumpBeforeAtBasicLevel

Methods inherited from class java.lang.Object

clone, getClass, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.graalvm.compiler.phases.contract.PhaseSizeContract

checkContract

Constructor Detail

ConvertDeoptimizeToGuardPhase

public ConvertDeoptimizeToGuardPhase(CanonicalizerPhase canonicalizer)

Method Detail

canApply

public Optional<BasePhase.NotApplicable> canApply(GraphState graphState)

Description copied from class: BasePhase

Checks if all the preconditions to BasePhase.apply(StructuredGraph, Object, boolean) the phase are met.

Overrides:

canApply in class PostRunCanonicalizationPhase<CoreProviders>

Parameters:

graphState - represents the state of the StructuredGraph used for compilation and contains the required information to determine if a phase can be applied.

Returns:

Optional.empty() if all the checks pass, Optional#of(NotApplicable) containing why this phase is not applicable on this graphState otherwise.

run

protected void run(StructuredGraph graph,
                   CoreProviders context)

Specified by:

run in class BasePhase<CoreProviders>