Mercurial > hg > graal-jvmci-8
comparison jvmci/jdk.vm.ci.code/src/jdk/vm/ci/code/BytecodePosition.java @ 22672:1bbd4a7c274b
Rename jdk.internal.jvmci to jdk.vm.ci
author | Tom Rodriguez <tom.rodriguez@oracle.com> |
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date | Thu, 08 Oct 2015 17:28:41 -0700 |
parents | jvmci/jdk.internal.jvmci.code/src/jdk/internal/jvmci/code/BytecodePosition.java@ec96f33a101d |
children | d64936a16a13 |
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22671:97f30e4d0e95 | 22672:1bbd4a7c274b |
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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 jdk.vm.ci.code; | |
24 | |
25 import java.util.Objects; | |
26 | |
27 import jdk.vm.ci.meta.ResolvedJavaMethod; | |
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 } |