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comparison graal/com.oracle.jvmci.code/src/com/oracle/jvmci/code/StackSlot.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/StackSlot.java@082417ac43e4
children
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21555:d12eaef9af72 21556:48c1ebd24120
1 /*
2 * Copyright (c) 2010, 2014, 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.LIRKind;
26
27 /**
28 * Represents a compiler spill slot or an outgoing stack-based argument in a method's frame or an
29 * incoming stack-based argument in a method's {@linkplain #isInCallerFrame() caller's frame}.
30 */
31 public final class StackSlot extends StackSlotValue {
32
33 private final int offset;
34 private final boolean addFrameSize;
35
36 /**
37 * Gets a {@link StackSlot} instance representing a stack slot at a given index holding a value
38 * of a given kind.
39 *
40 * @param kind The kind of the value stored in the stack slot.
41 * @param offset The offset of the stack slot (in bytes)
42 * @param addFrameSize Specifies if the offset is relative to the stack pointer, or the
43 * beginning of the frame (stack pointer + total frame size).
44 */
45 public static StackSlot get(LIRKind kind, int offset, boolean addFrameSize) {
46 assert addFrameSize || offset >= 0;
47 return new StackSlot(kind, offset, addFrameSize);
48 }
49
50 /**
51 * Private constructor to enforce use of {@link #get(LIRKind, int, boolean)} so that a cache can
52 * be used.
53 */
54 private StackSlot(LIRKind kind, int offset, boolean addFrameSize) {
55 super(kind);
56 this.offset = offset;
57 this.addFrameSize = addFrameSize;
58 }
59
60 /**
61 * Gets the offset of this stack slot, relative to the stack pointer.
62 *
63 * @return The offset of this slot (in bytes).
64 */
65 public int getOffset(int totalFrameSize) {
66 assert totalFrameSize > 0 || !addFrameSize;
67 int result = offset + (addFrameSize ? totalFrameSize : 0);
68 assert result >= 0;
69 return result;
70 }
71
72 public boolean isInCallerFrame() {
73 return addFrameSize && offset >= 0;
74 }
75
76 public int getRawOffset() {
77 return offset;
78 }
79
80 public boolean getRawAddFrameSize() {
81 return addFrameSize;
82 }
83
84 @Override
85 public String toString() {
86 if (!addFrameSize) {
87 return "out:" + offset + getKindSuffix();
88 } else if (offset >= 0) {
89 return "in:" + offset + getKindSuffix();
90 } else {
91 return "stack:" + (-offset) + getKindSuffix();
92 }
93 }
94
95 /**
96 * Gets this stack slot used to pass an argument from the perspective of a caller.
97 */
98 public StackSlot asOutArg() {
99 assert offset >= 0;
100 if (addFrameSize) {
101 return get(getLIRKind(), offset, false);
102 }
103 return this;
104 }
105
106 /**
107 * Gets this stack slot used to pass an argument from the perspective of a callee.
108 */
109 public StackSlot asInArg() {
110 assert offset >= 0;
111 if (!addFrameSize) {
112 return get(getLIRKind(), offset, true);
113 }
114 return this;
115 }
116
117 @Override
118 public int hashCode() {
119 final int prime = 37;
120 int result = super.hashCode();
121 result = prime * result + (addFrameSize ? 1231 : 1237);
122 result = prime * result + offset;
123 return result;
124 }
125
126 @Override
127 public boolean equals(Object obj) {
128 if (obj instanceof StackSlot) {
129 StackSlot other = (StackSlot) obj;
130 return super.equals(obj) && addFrameSize == other.addFrameSize && offset == other.offset;
131 }
132 return false;
133 }
134 }