1 /*
   2  * Copyright (c) 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.graph;
  24 
  25 import java.util.Objects;
  26 
  27 import jdk.vm.ci.code.BytecodePosition;
  28 import jdk.vm.ci.code.CodeUtil;
  29 import jdk.vm.ci.meta.JavaConstant;
  30 import jdk.vm.ci.meta.MetaUtil;
  31 import jdk.vm.ci.meta.ResolvedJavaMethod;
  32 
  33 public class NodeSourcePosition extends BytecodePosition {
  34 
  35     /**
  36      * The receiver of the method this frame refers to.
  37      */
  38     private final JavaConstant receiver;
  39 
  40     public NodeSourcePosition(JavaConstant receiver, NodeSourcePosition caller, ResolvedJavaMethod method, int bci) {
  41         super(caller, method, bci);
  42         this.receiver = receiver;
  43         assert receiver == null || method.getDeclaringClass().isInstance(receiver);
  44     }
  45 
  46     @Override
  47     public boolean equals(Object obj) {
  48         if (obj == this) {
  49             return true;
  50         }
  51         if (obj != null && getClass() == obj.getClass()) {
  52             NodeSourcePosition that = (NodeSourcePosition) obj;
  53             if (this.getBCI() == that.getBCI() && Objects.equals(this.getMethod(), that.getMethod()) && Objects.equals(this.getCaller(), that.getCaller()) &&
  54                             Objects.equals(this.receiver, that.receiver)) {
  55                 return true;
  56             }
  57         }
  58         return false;
  59     }
  60 
  61     public JavaConstant getReceiver() {
  62         return receiver;
  63     }
  64 
  65     @Override
  66     public NodeSourcePosition getCaller() {
  67         return (NodeSourcePosition) super.getCaller();
  68     }
  69 
  70     public NodeSourcePosition addCaller(JavaConstant newCallerReceiver, NodeSourcePosition link) {
  71         if (getCaller() == null) {
  72             assert newCallerReceiver == null || receiver == null : "replacing receiver";
  73             return new NodeSourcePosition(newCallerReceiver, link, getMethod(), getBCI());
  74         } else {
  75             return new NodeSourcePosition(receiver, getCaller().addCaller(newCallerReceiver, link), getMethod(), getBCI());
  76         }
  77     }
  78 
  79     public NodeSourcePosition addCaller(NodeSourcePosition link) {
  80         return addCaller(null, link);
  81     }
  82 
  83     @Override
  84     public String toString() {
  85         StringBuilder sb = new StringBuilder(100);
  86         NodeSourcePosition pos = this;
  87         while (pos != null) {
  88             MetaUtil.appendLocation(sb.append("at "), pos.getMethod(), pos.getBCI());
  89             if (pos.receiver != null) {
  90                 sb.append("receiver=" + pos.receiver + " ");
  91             }
  92             pos = pos.getCaller();
  93             if (pos != null) {
  94                 sb.append(CodeUtil.NEW_LINE);
  95             }
  96         }
  97         return sb.toString();
  98     }
  99 }