Package com.oracle.truffle.api.nodes
Enum NodeCost
- java.lang.Object
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- java.lang.Enum<NodeCost>
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- com.oracle.truffle.api.nodes.NodeCost
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- All Implemented Interfaces:
java.io.Serializable
,java.lang.Comparable<NodeCost>
public enum NodeCost extends java.lang.Enum<NodeCost>
Represents a rough estimate for the cost of aNode
. This estimate can be used by runtime systems or guest languages to implement heuristics based on Truffle ASTs.- See Also:
Node.getCost()
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Enum Constant Summary
Enum Constants Enum Constant Description MEGAMORPHIC
This node represents a megamorphic version of an operation.MONOMORPHIC
This node represents a specialized monomorphic version of an operation.NONE
This node has literally no costs and should be ignored for heuristics.POLYMORPHIC
This node represents a polymorphic version of an operation.UNINITIALIZED
This node has aCompilerDirectives.transferToInterpreter()
orCompilerDirectives.transferToInterpreterAndInvalidate()
as its first unconditional statement.
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Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
isTrivial()
static NodeCost
valueOf(java.lang.String name)
Returns the enum constant of this type with the specified name.static NodeCost[]
values()
Returns an array containing the constants of this enum type, in the order they are declared.
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Enum Constant Detail
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NONE
public static final NodeCost NONE
This node has literally no costs and should be ignored for heuristics. This is particularly useful for wrapper and profiling nodes which should not influence the heuristics.
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UNINITIALIZED
public static final NodeCost UNINITIALIZED
This node has aCompilerDirectives.transferToInterpreter()
orCompilerDirectives.transferToInterpreterAndInvalidate()
as its first unconditional statement.
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MONOMORPHIC
public static final NodeCost MONOMORPHIC
This node represents a specialized monomorphic version of an operation.
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POLYMORPHIC
public static final NodeCost POLYMORPHIC
This node represents a polymorphic version of an operation. For multiple chained polymorphic nodes the first may returnMONOMORPHIC
and all additional nodes should returnPOLYMORPHIC
.
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MEGAMORPHIC
public static final NodeCost MEGAMORPHIC
This node represents a megamorphic version of an operation. This value should only be used if the operation implementation supports monomorphism and polymorphism otherwiseMONOMORPHIC
should be used instead.
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Method Detail
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values
public static NodeCost[] values()
Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:for (NodeCost c : NodeCost.values()) System.out.println(c);
- Returns:
- an array containing the constants of this enum type, in the order they are declared
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valueOf
public static NodeCost valueOf(java.lang.String name)
Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)- Parameters:
name
- the name of the enum constant to be returned.- Returns:
- the enum constant with the specified name
- Throws:
java.lang.IllegalArgumentException
- if this enum type has no constant with the specified namejava.lang.NullPointerException
- if the argument is null
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isTrivial
public boolean isTrivial()
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