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 */
23package org.graalvm.compiler.graph;
24
25import java.util.Objects;
26
27import jdk.vm.ci.code.BytecodePosition;
28import jdk.vm.ci.code.CodeUtil;
29import jdk.vm.ci.meta.JavaConstant;
30import jdk.vm.ci.meta.MetaUtil;
31import jdk.vm.ci.meta.ResolvedJavaMethod;
32
33public class NodeSourcePosition extends BytecodePosition {
34
35    /**
36     * The receiver of the method this frame refers to.
37     */
38    private final JavaConstant receiver;
39    private final int hashCode;
40
41    public NodeSourcePosition(JavaConstant receiver, NodeSourcePosition caller, ResolvedJavaMethod method, int bci) {
42        super(caller, method, bci);
43        if (caller == null) {
44            this.hashCode = 31 * bci + method.hashCode();
45        } else {
46            this.hashCode = caller.hashCode * 7 + 31 * bci + method.hashCode();
47        }
48        this.receiver = receiver;
49        assert receiver == null || method.getDeclaringClass().isInstance(receiver);
50    }
51
52    @Override
53    public boolean equals(Object obj) {
54        if (obj == this) {
55            return true;
56        }
57        if (obj != null && getClass() == obj.getClass()) {
58            NodeSourcePosition that = (NodeSourcePosition) obj;
59            if (hashCode != that.hashCode) {
60                return false;
61            }
62            if (this.getBCI() == that.getBCI() && Objects.equals(this.getMethod(), that.getMethod()) && Objects.equals(this.getCaller(), that.getCaller()) &&
63                            Objects.equals(this.receiver, that.receiver)) {
64                return true;
65            }
66        }
67        return false;
68    }
69
70    @Override
71    public int hashCode() {
72        return hashCode;
73    }
74
75    public JavaConstant getReceiver() {
76        return receiver;
77    }
78
79    @Override
80    public NodeSourcePosition getCaller() {
81        return (NodeSourcePosition) super.getCaller();
82    }
83
84    public NodeSourcePosition addCaller(JavaConstant newCallerReceiver, NodeSourcePosition link) {
85        if (getCaller() == null) {
86            assert newCallerReceiver == null || receiver == null : "replacing receiver";
87            return new NodeSourcePosition(newCallerReceiver, link, getMethod(), getBCI());
88        } else {
89            return new NodeSourcePosition(receiver, getCaller().addCaller(newCallerReceiver, link), getMethod(), getBCI());
90        }
91    }
92
93    public NodeSourcePosition addCaller(NodeSourcePosition link) {
94        return addCaller(null, link);
95    }
96
97    @Override
98    public String toString() {
99        StringBuilder sb = new StringBuilder(100);
100        NodeSourcePosition pos = this;
101        while (pos != null) {
102            MetaUtil.appendLocation(sb.append("at "), pos.getMethod(), pos.getBCI());
103            if (pos.receiver != null) {
104                sb.append("receiver=" + pos.receiver + " ");
105            }
106            pos = pos.getCaller();
107            if (pos != null) {
108                sb.append(CodeUtil.NEW_LINE);
109            }
110        }
111        return sb.toString();
112    }
113}
114