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package org.graalvm.compiler.api.replacements;

import java.util.Objects;

import jdk.vm.ci.meta.JavaConstant;
import jdk.vm.ci.meta.JavaKind;
import jdk.vm.ci.meta.ResolvedJavaType;


Reflection operations on values represented as constants for the processing of snippets. Snippets need a direct access to the value of object constants, which is not allowed in other parts of Graal to enforce compiler-VM separation. 

This interface must not be used in Graal code that is not related to snippet processing.

/**
 * Reflection operations on values represented as {@linkplain JavaConstant constants} for the
 * processing of snippets. Snippets need a direct access to the value of object constants, which is
 * not allowed in other parts of Graal to enforce compiler-VM separation.
 * <p>
 * This interface must not be used in Graal code that is not related to snippet processing.
 */
public interface SnippetReflectionProvider {

    
Creates a boxed object constant. 
Params:
  • object – the object value to box
Returns:a constant containing object
/**
     * Creates a boxed {@link JavaKind#Object object} constant.
     *
     * @param object the object value to box
     * @return a constant containing {@code object}
     */
    JavaConstant forObject(Object object);

    
Gets the object reference a given constant represents if it is of a given type. The constant must have kind JavaKind.Object. 
Params:
  • type – the expected type of the object represented by constant. If the object is required to be of this type, then wrap the call to this method in Objects.requireNonNull(Object).
  • constant – an object constant
Returns:the object value represented by constant cast to type if it is an instance of type otherwise null
/**
     * Gets the object reference a given constant represents if it is of a given type. The constant
     * must have kind {@link JavaKind#Object}.
     *
     * @param type the expected type of the object represented by {@code constant}. If the object is
     *            required to be of this type, then wrap the call to this method in
     *            {@link Objects#requireNonNull(Object)}.
     * @param constant an object constant
     * @return the object value represented by {@code constant} cast to {@code type} if it is an
     *         {@link Class#isInstance(Object) instance of} {@code type} otherwise {@code null}
     */
    <T> T asObject(Class<T> type, JavaConstant constant);

    
Creates a boxed constant for the given kind from an Object. The object needs to be of the
Java boxed type corresponding to the kind.

Params:
  • kind – the kind of the constant to create
  • value – the Java boxed value: a Byte instance for JavaKind.Byte, etc.
Returns:the boxed copy of value
/**
     * Creates a boxed constant for the given kind from an Object. The object needs to be of the
     * Java boxed type corresponding to the kind.
     *
     * @param kind the kind of the constant to create
     * @param value the Java boxed value: a {@link Byte} instance for {@link JavaKind#Byte}, etc.
     * @return the boxed copy of {@code value}
     */
    default JavaConstant forBoxed(JavaKind kind, Object value) {
        if (kind == JavaKind.Object) {
            return forObject(value);
        } else {
            return JavaConstant.forBoxedPrimitive(value);
        }
    }

    
Gets the value to bind to an injected parameter in a node intrinsic.

Params:
  • type – the type of a parameter in a node intrinsic constructor
Returns:the value that should be bound to the parameter when invoking the constructor or null
        if this provider cannot provide a value of the requested type
/**
     * Gets the value to bind to an injected parameter in a node intrinsic.
     *
     * @param type the type of a parameter in a node intrinsic constructor
     * @return the value that should be bound to the parameter when invoking the constructor or null
     *         if this provider cannot provide a value of the requested type
     */
    <T> T getInjectedNodeIntrinsicParameter(Class<T> type);

    
Get the original Java class corresponding to a ResolvedJavaType. 
Params:
  • type – the type for which the original Java class is requested
Returns:the original Java class corresponding to type or null if this object cannot map ResolvedJavaType instances to Class instances
/**
     * Get the original Java class corresponding to a {@link ResolvedJavaType}.
     *
     * @param type the type for which the original Java class is requested
     * @return the original Java class corresponding to {@code type} or {@code null} if this object
     *         cannot map {@link ResolvedJavaType} instances to {@link Class} instances
     */
    Class<?> originalClass(ResolvedJavaType type);
}