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package org.graalvm.compiler.replacements;

import org.graalvm.compiler.api.replacements.SnippetReflectionProvider;
import org.graalvm.compiler.core.common.type.StampPair;
import org.graalvm.compiler.nodes.ConstantNode;
import org.graalvm.compiler.nodes.calc.FloatingNode;
import org.graalvm.compiler.nodes.graphbuilderconf.GraphBuilderTool;
import org.graalvm.compiler.nodes.graphbuilderconf.ParameterPlugin;

import jdk.vm.ci.meta.Constant;
import jdk.vm.ci.meta.MetaAccessProvider;

A ParameterPlugin that binds constant values to some parameters.
/** * A {@link ParameterPlugin} that binds constant values to some parameters. */
public class ConstantBindingParameterPlugin implements ParameterPlugin { private final Object[] constantArgs; private final MetaAccessProvider metaAccess; private final SnippetReflectionProvider snippetReflection;
Creates a plugin that will create ConstantNodes for each parameter with an index equal to that of a non-null object in constantArgs (from which the ConstantNode is created if it isn't already a ConstantNode).
/** * Creates a plugin that will create {@link ConstantNode}s for each parameter with an index * equal to that of a non-null object in {@code constantArgs} (from which the * {@link ConstantNode} is created if it isn't already a {@link ConstantNode}). */
public ConstantBindingParameterPlugin(Object[] constantArgs, MetaAccessProvider metaAccess, SnippetReflectionProvider snippetReflection) { this.constantArgs = constantArgs; this.metaAccess = metaAccess; this.snippetReflection = snippetReflection; } @Override public FloatingNode interceptParameter(GraphBuilderTool b, int index, StampPair stamp) { Object arg = constantArgs[index]; if (arg != null) { ConstantNode constantNode; if (arg instanceof ConstantNode) { ConstantNode otherCon = (ConstantNode) arg; if (otherCon.graph() != b.getGraph()) { /* * This is a node from another graph, so copy over extra state into a new * ConstantNode. */ constantNode = ConstantNode.forConstant(stamp.getTrustedStamp(), otherCon.getValue(), otherCon.getStableDimension(), otherCon.isDefaultStable(), metaAccess); } else { constantNode = otherCon; } } else if (arg instanceof Constant) { constantNode = ConstantNode.forConstant(stamp.getTrustedStamp(), (Constant) arg, metaAccess); } else { constantNode = ConstantNode.forConstant(snippetReflection.forBoxed(stamp.getTrustedStamp().getStackKind(), arg), metaAccess); } return constantNode; } return null; } }