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comparison graal/com.oracle.jvmci.code/src/com/oracle/jvmci/code/BytecodePosition.java @ 21556:48c1ebd24120

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renamed com.oracle.graal.api[meta|code] modules to com.oracle.jvmci.[meta|code] (JBS:GRAAL-53)
author Doug Simon <doug.simon@oracle.com>
date Wed, 27 May 2015 00:36:16 +0200
parents graal/com.oracle.graal.api.code/src/com/oracle/graal/api/code/BytecodePosition.java@877d718f3ab2
children f5b549811bac
comparison
equal deleted inserted replaced
21555:d12eaef9af72 21556:48c1ebd24120
1 /*
2 * Copyright (c) 2009, 2011, 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 com.oracle.jvmci.code;
24
25 import com.oracle.jvmci.meta.ResolvedJavaMethod;
26 import java.util.*;
27
28
29 /**
30 * Represents a code position, that is, a chain of inlined methods with bytecode locations, that is
31 * communicated from the compiler to the runtime system. A code position can be used by the runtime
32 * system to reconstruct a source-level stack trace for exceptions and to create
33 * {@linkplain BytecodeFrame frames} for deoptimization.
34 */
35 public class BytecodePosition {
36
37 private final BytecodePosition caller;
38 private final ResolvedJavaMethod method;
39 private final int bci;
40
41 /**
42 * Constructs a new object representing a given parent/caller, a given method, and a given BCI.
43 *
44 * @param caller the parent position
45 * @param method the method
46 * @param bci a BCI within the method
47 */
48 public BytecodePosition(BytecodePosition caller, ResolvedJavaMethod method, int bci) {
49 assert method != null;
50 this.caller = caller;
51 this.method = method;
52 this.bci = bci;
53 }
54
55 /**
56 * Converts this code position to a string representation.
57 *
58 * @return a string representation of this code position
59 */
60 @Override
61 public String toString() {
62 return CodeUtil.append(new StringBuilder(100), this).toString();
63 }
64
65 /**
66 * Deep equality test.
67 */
68 @Override
69 public boolean equals(Object obj) {
70 if (obj == this) {
71 return true;
72 }
73 if (obj != null && getClass() == obj.getClass()) {
74 BytecodePosition that = (BytecodePosition) obj;
75 if (this.bci == that.bci && Objects.equals(this.getMethod(), that.getMethod()) && Objects.equals(this.caller, that.caller)) {
76 return true;
77 }
78 }
79 return false;
80 }
81
82 @Override
83 public int hashCode() {
84 return getBCI();
85 }
86
87 /**
88 * @return The location within the method, as a bytecode index. The constant {@code -1} may be
89 * used to indicate the location is unknown, for example within code synthesized by the
90 * compiler.
91 */
92 public int getBCI() {
93 return bci;
94 }
95
96 /**
97 * @return The runtime interface method for this position.
98 */
99 public ResolvedJavaMethod getMethod() {
100 return method;
101 }
102
103 /**
104 * The position where this position has been called, {@code null} if none.
105 */
106 public BytecodePosition getCaller() {
107 return caller;
108 }
109
110 /**
111 * Adds a caller to the current position returning the new position.
112 */
113 public BytecodePosition addCaller(BytecodePosition link) {
114 if (getCaller() == null) {
115 return new BytecodePosition(link, getMethod(), getBCI());
116 } else {
117 return new BytecodePosition(getCaller().addCaller(link), getMethod(), getBCI());
118 }
119 }
120 }