com.oracle.graal.hotspot.nodes

Class CompressionNode

java.lang.Object

com.oracle.graal.graph.Node

com.oracle.graal.nodes.ValueNode

com.oracle.graal.nodes.calc.FloatingNode

com.oracle.graal.nodes.calc.UnaryNode

com.oracle.graal.hotspot.nodes.CompressionNode

All Implemented Interfaces:

Node.ValueNumberable, NodeInterface, Canonicalizable, Canonicalizable.Unary<ValueNode>, ArithmeticOperation, ConvertNode, LIRLowerable, Cloneable, Formattable, KindProvider

public final class CompressionNode
extends UnaryNode
implements ConvertNode, LIRLowerable

Compress or uncompress an oop or metaspace pointer.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	CompressionNode.CompressionOp

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 HotSpotVMConfig.CompressEncoding	encoding
protected CompressionNode.CompressionOp	op
static NodeClass<CompressionNode>	TYPE

Fields inherited from class com.oracle.graal.nodes.calc.UnaryNode

value

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
CompressionNode(CompressionNode.CompressionOp op, ValueNode input, HotSpotVMConfig.CompressEncoding encoding)

Method Summary

Modifier and Type	Method and Description
ValueNode	canonical(CanonicalizerTool tool, ValueNode forValue) Similar to Canonicalizable.canonical(CanonicalizerTool), except that implementations should act as if the current input of the node was the given one, i.e., they should never look at the inputs via the this pointer.
private static Constant	compress(Constant c, HotSpotVMConfig.CompressEncoding encoding)
static CompressionNode	compress(ValueNode input, HotSpotVMConfig.CompressEncoding encoding)
static Object	compression(CompressionNode.CompressionOp op, Object object, HotSpotVMConfig.CompressEncoding encoding)
static CompressionNode	compressNoUnique(ValueNode input, HotSpotVMConfig.CompressEncoding encoding)
Constant	convert(Constant c, ConstantReflectionProvider constantReflection)
void	generate(NodeLIRBuilderTool gen)
HotSpotVMConfig.CompressEncoding	getEncoding()
CompressionNode.CompressionOp	getOp()
boolean	inferStamp() This method can be overridden by subclasses of ValueNode if they need to recompute their stamp if their inputs change.
boolean	isLossless() Check whether a conversion is lossless.
private static Stamp	mkStamp(CompressionNode.CompressionOp op, Stamp input, HotSpotVMConfig.CompressEncoding encoding)
Constant	reverse(Constant c, ConstantReflectionProvider constantReflection)
private static Constant	uncompress(Constant c, HotSpotVMConfig.CompressEncoding encoding)
static CompressionNode	uncompress(ValueNode input, HotSpotVMConfig.CompressEncoding encoding)

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

getValue

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

asNode

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

asConstant, asJavaConstant, getKind, graph, 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.calc.ConvertNode

asNode, getValue, preservesOrder, preservesOrder

Methods inherited from interface com.oracle.graal.graph.spi.Canonicalizable.Unary

canonical

Field Detail

TYPE

public static final NodeClass<CompressionNode> TYPE

op

protected final CompressionNode.CompressionOp op

encoding

protected final HotSpotVMConfig.CompressEncoding encoding

Constructor Detail

CompressionNode

public CompressionNode(CompressionNode.CompressionOp op,
                       ValueNode input,
                       HotSpotVMConfig.CompressEncoding encoding)

Method Detail

inferStamp

public boolean inferStamp()

Description copied from class: ValueNode

This method can be overridden by subclasses of ValueNode if they need to recompute their stamp if their inputs change. A typical implementation will compute the stamp and pass it to ValueNode.updateStamp(Stamp), whose return value can be used as the result of this method.

Overrides:

inferStamp in class ValueNode

Returns:

true if the stamp has changed, false otherwise.

compress

public static CompressionNode compress(ValueNode input,
                                       HotSpotVMConfig.CompressEncoding encoding)

compressNoUnique

public static CompressionNode compressNoUnique(ValueNode input,
                                               HotSpotVMConfig.CompressEncoding encoding)

uncompress

public static CompressionNode uncompress(ValueNode input,
                                         HotSpotVMConfig.CompressEncoding encoding)

compress

private static Constant compress(Constant c,
                                 HotSpotVMConfig.CompressEncoding encoding)

uncompress

private static Constant uncompress(Constant c,
                                   HotSpotVMConfig.CompressEncoding encoding)

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

mkStamp

private static Stamp mkStamp(CompressionNode.CompressionOp op,
                             Stamp input,
                             HotSpotVMConfig.CompressEncoding encoding)

getOp

public CompressionNode.CompressionOp getOp()

getEncoding

public HotSpotVMConfig.CompressEncoding getEncoding()

canonical

public ValueNode canonical(CanonicalizerTool tool,
                           ValueNode forValue)

Description copied from interface: Canonicalizable.Unary

Similar to Canonicalizable.canonical(CanonicalizerTool), except that implementations should act as if the current input of the node was the given one, i.e., they should never look at the inputs via the this pointer.

Specified by:

canonical in interface Canonicalizable.Unary<ValueNode>

generate

public void generate(NodeLIRBuilderTool gen)

Specified by:

generate in interface LIRLowerable

compression

public static Object compression(CompressionNode.CompressionOp op,
                                 Object object,
                                 HotSpotVMConfig.CompressEncoding encoding)