com.oracle.graal.hotspot.replacements

Class ClassGetHubNode

java.lang.Object

com.oracle.graal.graph.Node

com.oracle.graal.nodes.ValueNode

com.oracle.graal.nodes.calc.FloatingNode

com.oracle.graal.nodes.FloatingGuardedNode

com.oracle.graal.hotspot.replacements.ClassGetHubNode

All Implemented Interfaces:

Node.ValueNumberable, NodeInterface, Canonicalizable, ArithmeticOperation, ConvertNode, GuardedNode, Lowerable, Cloneable, Formattable, KindProvider

public final class ClassGetHubNode
extends FloatingGuardedNode
implements Lowerable, Canonicalizable, ConvertNode

Read Class::_klass to get the hub for a Class. This node mostly exists to replace _klass._java_mirror._klass with _klass. The constant folding could be handled by ReadNode.canonicalizeRead(ValueNode, AddressNode, LocationIdentity, CanonicalizerTool).

Nested Class Summary

Nested classes/interfaces inherited from class com.oracle.graal.graph.Node

Node.ConstantNodeParameter, Node.InjectedNodeParameter, Node.Input, Node.NodeIntrinsic, Node.OptionalInput, Node.Successor, Node.ValueNumberable

Nested classes/interfaces inherited from interface com.oracle.graal.graph.spi.Canonicalizable

Canonicalizable.Binary<T extends Node>, Canonicalizable.BinaryCommutative<T extends Node>, Canonicalizable.Unary<T extends Node>

Field Summary

Fields

Modifier and Type	Field and Description
protected ValueNode	clazz
(package private) StampProvider	stampProvider
static NodeClass<ClassGetHubNode>	TYPE

Fields inherited from class com.oracle.graal.nodes.FloatingGuardedNode

guard

Fields inherited from class com.oracle.graal.nodes.ValueNode

stamp

Fields inherited from class com.oracle.graal.graph.Node

NODE_LIST, NOT_ITERABLE, USE_UNSAFE_TO_CLONE, WithAllEdges, WithNoEdges, WithOnlyInputEdges, WithOnlySucessorEdges

Constructor Summary

Constructors

Constructor and Description
ClassGetHubNode(StampProvider stampProvider, ValueNode clazz)
ClassGetHubNode(StampProvider stampProvider, ValueNode clazz, ValueNode guard)

Method Summary

Modifier and Type	Method and Description
Node	canonical(CanonicalizerTool tool) Implementations of this method can provide local optimizations like constant folding and strength reduction.
Constant	convert(Constant c, ConstantReflectionProvider constantReflection)
ValueNode	getValue()
boolean	isLossless() Check whether a conversion is lossless.
void	lower(LoweringTool tool) Expand this node into lower level nodes expressing the same semantics.
boolean	preservesOrder(Condition op, Constant value, ConstantReflectionProvider constantReflection) Check whether a conversion preserves comparison order against a particular constant value.
static KlassPointer	readClass(Class<?> clazz)
static KlassPointer	readClass(Class<?> clazz, GuardingNode guard)
Constant	reverse(Constant c, ConstantReflectionProvider constantReflection)

Methods inherited from class com.oracle.graal.nodes.FloatingGuardedNode

getGuard, setGuard

Methods inherited from class com.oracle.graal.nodes.calc.FloatingNode

asNode

Methods inherited from class com.oracle.graal.nodes.ValueNode

asConstant, asJavaConstant, getKind, graph, inferStamp, isAllowedUsageType, isConstant, isConstantPredicate, isNullConstant, setStamp, stamp, updateStamp

Methods inherited from class com.oracle.graal.graph.Node

acceptInputs, acceptSuccessors, afterClone, assertFalse, assertTrue, cfgPredecessors, cfgSuccessors, clearInputs, clearSuccessors, copyWithInputs, copyWithInputs, equals, fail, formatTo, getDebugProperties, getDebugProperties, getId, getNodeClass, getUsageAt, getUsageCount, hashCode, hasNoUsages, hasUsages, inputs, isAlive, isDeleted, markDeleted, modCount, newIdentityMap, newIdentityMap, newIdentityMap, newMap, newMap, newMap, newSet, newSet, predecessor, pushInputs, removeUsage, replaceAndDelete, replaceAtMatchingUsages, replaceAtPredecessor, replaceAtUsages, replaceAtUsages, replaceAtUsages, replaceFirstInput, replaceFirstSuccessor, safeDelete, simplify, successors, toString, toString, updatePredecessor, updateUsages, updateUsagesInterface, usages, valueEquals, verify, verifyEdges, verifyInputs

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.oracle.graal.nodes.spi.Lowerable

asNode

Methods inherited from interface com.oracle.graal.nodes.calc.ConvertNode

asNode, preservesOrder

Methods inherited from interface com.oracle.graal.nodes.extended.GuardedNode

asNode

Field Detail

TYPE

public static final NodeClass<ClassGetHubNode> TYPE

clazz

protected ValueNode clazz

stampProvider

StampProvider stampProvider

Constructor Detail

ClassGetHubNode

public ClassGetHubNode(StampProvider stampProvider,
                       ValueNode clazz)

ClassGetHubNode

public ClassGetHubNode(StampProvider stampProvider,
                       ValueNode clazz,
                       ValueNode guard)

Method Detail

canonical

public Node canonical(CanonicalizerTool tool)

Description copied from interface: Canonicalizable

Implementations of this method can provide local optimizations like constant folding and strength reduction. Implementations should look at the properties and inputs of the current node and determine if there is a more optimal and always semantically correct replacement.
The return value determines the effect that the canonicalization will have:

• Returning an pre-existing node will replace the current node with the given one.
• Returning a newly created node (that was not yet added to the graph) will replace the current node with the given one, after adding it to the graph. If both the replacement and the replacee are anchored in control flow (fixed nodes), the replacement will be added to the control flow. It is invalid to replace a non-fixed node with a newly created fixed node (because its placement in the control flow cannot be determined without scheduling).
• Returning null will delete the current node and replace it with null at all usages. Note that it is not necessary to delete floating nodes that have no more usages this way - they will be deleted automatically.

Specified by:

canonical in interface Canonicalizable

Parameters:

tool - provides access to runtime interfaces like MetaAccessProvider

lower

public void lower(LoweringTool tool)

Description copied from interface: Lowerable

Expand this node into lower level nodes expressing the same semantics. If the introduced nodes are themselves lowerable, they should be recursively lowered as part of this call.

Specified by:

lower in interface Lowerable

readClass

public static KlassPointer readClass(Class<?> clazz)

readClass

public static KlassPointer readClass(Class<?> clazz,
                                     GuardingNode guard)

getValue

public ValueNode getValue()

Specified by:

getValue in interface ConvertNode

convert

public Constant convert(Constant c,
                        ConstantReflectionProvider constantReflection)

Specified by:

convert in interface ConvertNode

reverse

public Constant reverse(Constant c,
                        ConstantReflectionProvider constantReflection)

Specified by:

reverse in interface ConvertNode

isLossless

public boolean isLossless()

Description copied from interface: ConvertNode

Check whether a conversion is lossless.

Specified by:

isLossless in interface ConvertNode

Returns:

true iff reverse(convert(c)) == c for all c

preservesOrder

public boolean preservesOrder(Condition op,
                              Constant value,
                              ConstantReflectionProvider constantReflection)

Description copied from interface: ConvertNode

Check whether a conversion preserves comparison order against a particular constant value.

Specified by:

preservesOrder in interface ConvertNode

Parameters:

op - a comparison operator

Returns:

true iff (c1 op value) == (convert(c1) op convert(value)) for value and all c1