com.oracle.graal.nodes.extended

Class UnsafeCastNode

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.nodes.extended.UnsafeCastNode

All Implemented Interfaces:

IterableNodeType, Node.ValueNumberable, NodeInterface, Canonicalizable, GuardedNode, GuardingNode, LimitedValueProxy, LIRLowerable, Proxy, ValueProxy, Virtualizable, Cloneable, Formattable, KindProvider

public final class UnsafeCastNode
extends FloatingGuardedNode
implements LIRLowerable, Virtualizable, GuardingNode, IterableNodeType, Canonicalizable, ValueProxy

The UnsafeCastNode produces the same value as its input, but with a different type. It allows unsafe casts "sideways" in the type hierarchy. It does not allow to "drop" type information, i.e., an unsafe cast is removed if the input object has a more precise or equal type than the type this nodes casts to.

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
(package private) ValueNode	object
static NodeClass<UnsafeCastNode>	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
UnsafeCastNode(ValueNode object, ResolvedJavaType toType, boolean exactType, boolean nonNull)
UnsafeCastNode(ValueNode object, Stamp stamp)
UnsafeCastNode(ValueNode object, Stamp stamp, ValueNode anchor)

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.
void	generate(NodeLIRBuilderTool generator)
ValueNode	getOriginalNode()
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.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.extended.GuardingNode

asNode

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

asNode

Field Detail

TYPE

public static final NodeClass<UnsafeCastNode> TYPE

object

ValueNode object

Constructor Detail

UnsafeCastNode

public UnsafeCastNode(ValueNode object,
                      Stamp stamp)

UnsafeCastNode

public UnsafeCastNode(ValueNode object,
                      Stamp stamp,
                      ValueNode anchor)

UnsafeCastNode

public UnsafeCastNode(ValueNode object,
                      ResolvedJavaType toType,
                      boolean exactType,
                      boolean nonNull)

Method Detail

getOriginalNode

public ValueNode getOriginalNode()

Specified by:

getOriginalNode in interface LimitedValueProxy

Specified by:

getOriginalNode in interface Proxy

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

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

generate

public void generate(NodeLIRBuilderTool generator)

Specified by:

generate in interface LIRLowerable