1 /*
   2  * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 package org.graalvm.compiler.replacements;
  24 
  25 import org.graalvm.compiler.api.replacements.SnippetReflectionProvider;
  26 import org.graalvm.compiler.core.common.type.StampPair;
  27 import org.graalvm.compiler.nodes.ConstantNode;
  28 import org.graalvm.compiler.nodes.calc.FloatingNode;
  29 import org.graalvm.compiler.nodes.graphbuilderconf.GraphBuilderTool;
  30 import org.graalvm.compiler.nodes.graphbuilderconf.ParameterPlugin;
  31 
  32 import jdk.vm.ci.meta.Constant;
  33 import jdk.vm.ci.meta.MetaAccessProvider;
  34 
  35 /**
  36  * A {@link ParameterPlugin} that binds constant values to some parameters.
  37  */
  38 public class ConstantBindingParameterPlugin implements ParameterPlugin {
  39     private final Object[] constantArgs;
  40     private final MetaAccessProvider metaAccess;
  41     private final SnippetReflectionProvider snippetReflection;
  42 
  43     /**
  44      * Creates a plugin that will create {@link ConstantNode}s for each parameter with an index
  45      * equal to that of a non-null object in {@code constantArgs} (from which the
  46      * {@link ConstantNode} is created if it isn't already a {@link ConstantNode}).
  47      */
  48     public ConstantBindingParameterPlugin(Object[] constantArgs, MetaAccessProvider metaAccess, SnippetReflectionProvider snippetReflection) {
  49         this.constantArgs = constantArgs;
  50         this.metaAccess = metaAccess;
  51         this.snippetReflection = snippetReflection;
  52     }
  53 
  54     @Override
  55     public FloatingNode interceptParameter(GraphBuilderTool b, int index, StampPair stamp) {
  56         Object arg = constantArgs[index];
  57         if (arg != null) {
  58             ConstantNode constantNode;
  59             if (arg instanceof ConstantNode) {
  60                 ConstantNode otherCon = (ConstantNode) arg;
  61                 if (otherCon.graph() != b.getGraph()) {
  62                     /*
  63                      * This is a node from another graph, so copy over extra state into a new
  64                      * ConstantNode.
  65                      */
  66                     constantNode = ConstantNode.forConstant(stamp.getTrustedStamp(), otherCon.asConstant(), otherCon.getStableDimension(), otherCon.isDefaultStable(), metaAccess);
  67                 } else {
  68                     constantNode = otherCon;
  69                 }
  70             } else if (arg instanceof Constant) {
  71                 constantNode = ConstantNode.forConstant(stamp.getTrustedStamp(), (Constant) arg, metaAccess);
  72             } else {
  73                 constantNode = ConstantNode.forConstant(snippetReflection.forBoxed(stamp.getTrustedStamp().getStackKind(), arg), metaAccess);
  74             }
  75             return constantNode;
  76         }
  77         return null;
  78     }
  79 }