com.oracle.graal.nodes.memory

Class ReadNode

java.lang.Object

com.oracle.graal.graph.Node

com.oracle.graal.nodes.ValueNode

com.oracle.graal.nodes.FixedNode

com.oracle.graal.nodes.FixedWithNextNode

com.oracle.graal.nodes.DeoptimizingFixedWithNextNode

com.oracle.graal.nodes.memory.FixedAccessNode

com.oracle.graal.nodes.memory.FloatableAccessNode

com.oracle.graal.nodes.memory.ReadNode

All Implemented Interfaces:

NodeInterface, Canonicalizable, DeoptimizingNode, DeoptimizingNode.DeoptBefore, GuardedNode, GuardingNode, Access, HeapAccess, LIRLowerable, NodeWithState, Virtualizable, Cloneable, Formattable, KindProvider

public final class ReadNode
extends FloatableAccessNode
implements LIRLowerable, Canonicalizable, Virtualizable, GuardingNode

Reads an accessed value.

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>

Nested classes/interfaces inherited from interface com.oracle.graal.nodes.memory.HeapAccess

HeapAccess.BarrierType

Nested classes/interfaces inherited from interface com.oracle.graal.nodes.DeoptimizingNode

DeoptimizingNode.DeoptAfter, DeoptimizingNode.DeoptBefore, DeoptimizingNode.DeoptDuring

Field Summary

Fields

Modifier and Type	Field and Description
static NodeClass<ReadNode>	TYPE

Fields inherited from class com.oracle.graal.nodes.memory.FloatableAccessNode

forceFixed

Fields inherited from class com.oracle.graal.nodes.memory.FixedAccessNode

address, barrierType, guard, location, nullCheck

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

stateBefore

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

next

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
ReadNode(AddressNode address, LocationIdentity location, Stamp stamp, GuardingNode guard, HeapAccess.BarrierType barrierType)
ReadNode(AddressNode address, LocationIdentity location, Stamp stamp, GuardingNode guard, HeapAccess.BarrierType barrierType, boolean nullCheck, FrameState stateBefore)
ReadNode(AddressNode address, LocationIdentity location, Stamp stamp, HeapAccess.BarrierType barrierType)
ReadNode(AddressNode address, LocationIdentity location, ValueNode guard, HeapAccess.BarrierType barrierType)

Method Summary

Modifier and Type	Method and Description
FloatingAccessNode	asFloatingNode(MemoryNode lastLocationAccess)
boolean	canNullCheck()
Node	canonical(CanonicalizerTool tool) Implementations of this method can provide local optimizations like constant folding and strength reduction.
static ValueNode	canonicalizeRead(ValueNode read, AddressNode address, LocationIdentity locationIdentity, CanonicalizerTool tool)
void	generate(NodeLIRBuilderTool gen)
boolean	isAllowedUsageType(InputType type)
void	virtualize(VirtualizerTool tool) A node class can implement this method to convey information about what its effect would be if some of its inputs were virtualized.

Methods inherited from class com.oracle.graal.nodes.memory.FloatableAccessNode

canFloat, setForceFixed

Methods inherited from class com.oracle.graal.nodes.memory.FixedAccessNode

canDeoptimize, getAddress, getBarrierType, getGuard, getLocationIdentity, getNullCheck, setAddress, setGuard, setNullCheck

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

setStateBefore, stateBefore

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

asNode, next, setNext

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

verify

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

asConstant, asJavaConstant, getKind, graph, inferStamp, 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, 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.extended.GuardingNode

asNode

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

asNode

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

states

Field Detail

TYPE

public static final NodeClass<ReadNode> TYPE

Constructor Detail

ReadNode

public ReadNode(AddressNode address,
                LocationIdentity location,
                Stamp stamp,
                HeapAccess.BarrierType barrierType)

ReadNode

public ReadNode(AddressNode address,
                LocationIdentity location,
                Stamp stamp,
                GuardingNode guard,
                HeapAccess.BarrierType barrierType)

ReadNode

public ReadNode(AddressNode address,
                LocationIdentity location,
                Stamp stamp,
                GuardingNode guard,
                HeapAccess.BarrierType barrierType,
                boolean nullCheck,
                FrameState stateBefore)

ReadNode

public ReadNode(AddressNode address,
                LocationIdentity location,
                ValueNode guard,
                HeapAccess.BarrierType barrierType)

Method Detail

generate

public void generate(NodeLIRBuilderTool gen)

Specified by:

generate in interface LIRLowerable

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

asFloatingNode

public FloatingAccessNode asFloatingNode(MemoryNode lastLocationAccess)

Specified by:

asFloatingNode in class FloatableAccessNode

isAllowedUsageType

public boolean isAllowedUsageType(InputType type)

Overrides:

isAllowedUsageType in class ValueNode

canonicalizeRead

public static ValueNode canonicalizeRead(ValueNode read,
                                         AddressNode address,
                                         LocationIdentity locationIdentity,
                                         CanonicalizerTool tool)

virtualize

public void virtualize(VirtualizerTool tool)

Description copied from interface: Virtualizable

A node class can implement this method to convey information about what its effect would be if some of its inputs were virtualized. All modifications must be made through the supplied tool, and not directly on the node, because by the time this method is called the virtualized/non-virtualized state is still speculative and might not hold because of loops, etc.

Specified by:

virtualize in interface Virtualizable

Parameters:

tool - the tool used to describe the effects of this node

canNullCheck

public boolean canNullCheck()

Specified by:

canNullCheck in interface Access