Mercurial > hg > graal-compiler
comparison graal/com.oracle.jvmci.code/src/com/oracle/jvmci/code/StackSlot.java @ 21556:48c1ebd24120
renamed com.oracle.graal.api[meta|code] modules to com.oracle.jvmci.[meta|code] (JBS:GRAAL-53)
author | Doug Simon <doug.simon@oracle.com> |
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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 |
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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 } |