1 /*
   2  * Copyright (c) 2016, 2018, 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 
  24 
  25 package org.graalvm.compiler.nodes.calc;
  26 
  27 import static org.graalvm.compiler.nodeinfo.NodeCycles.CYCLES_32;
  28 import static org.graalvm.compiler.nodeinfo.NodeSize.SIZE_1;
  29 
  30 import org.graalvm.compiler.core.common.type.IntegerStamp;
  31 import org.graalvm.compiler.core.common.type.Stamp;
  32 import org.graalvm.compiler.graph.NodeClass;
  33 import org.graalvm.compiler.nodeinfo.InputType;
  34 import org.graalvm.compiler.nodeinfo.NodeInfo;
  35 import org.graalvm.compiler.nodes.NodeView;
  36 import org.graalvm.compiler.nodes.ValueNode;
  37 import org.graalvm.compiler.nodes.extended.GuardingNode;
  38 import org.graalvm.compiler.nodes.spi.Lowerable;
  39 import org.graalvm.compiler.nodes.spi.LoweringTool;
  40 
  41 @NodeInfo(cycles = CYCLES_32, size = SIZE_1)
  42 public abstract class IntegerDivRemNode extends FixedBinaryNode implements Lowerable {
  43 
  44     public static final NodeClass<IntegerDivRemNode> TYPE = NodeClass.create(IntegerDivRemNode.class);
  45 
  46     public enum Op {
  47         DIV,
  48         REM
  49     }
  50 
  51     public enum Type {
  52         SIGNED,
  53         UNSIGNED
  54     }
  55 
  56     @OptionalInput(InputType.Guard) private GuardingNode zeroCheck;
  57 
  58     private final Op op;
  59     private final Type type;
  60     private final boolean canDeopt;
  61 
  62     protected IntegerDivRemNode(NodeClass<? extends IntegerDivRemNode> c, Stamp stamp, Op op, Type type, ValueNode x, ValueNode y, GuardingNode zeroCheck) {
  63         super(c, stamp, x, y);
  64         this.zeroCheck = zeroCheck;
  65         this.op = op;
  66         this.type = type;
  67 
  68         // Assigning canDeopt during constructor, because it must never change during lifetime of
  69         // the node.
  70         IntegerStamp yStamp = (IntegerStamp) getY().stamp(NodeView.DEFAULT);
  71         this.canDeopt = (yStamp.contains(0) && zeroCheck == null) || yStamp.contains(-1);
  72     }
  73 
  74     public final GuardingNode getZeroCheck() {
  75         return zeroCheck;
  76     }
  77 
  78     public final Op getOp() {
  79         return op;
  80     }
  81 
  82     public final Type getType() {
  83         return type;
  84     }
  85 
  86     @Override
  87     public void lower(LoweringTool tool) {
  88         tool.getLowerer().lower(this, tool);
  89     }
  90 
  91     @Override
  92     public boolean canDeoptimize() {
  93         return canDeopt;
  94     }
  95 }