Mercurial > hg > truffle
comparison graal/com.oracle.max.cri/src/com/sun/cri/ci/CiCalleeSaveLayout.java @ 3733:e233f5660da4
Added Java files from Maxine project.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sat, 17 Dec 2011 19:59:18 +0100 |
parents | |
children | bc8527f3071c |
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3732:3e2e8b8abdaf | 3733:e233f5660da4 |
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1 /* | |
2 * Copyright (c) 2010, 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.sun.cri.ci; | |
24 | |
25 import java.util.*; | |
26 | |
27 | |
28 /** | |
29 * The callee save area (CSA) is a contiguous space in a stack frame | |
30 * used to save (and restore) the values of the caller's registers. | |
31 * This class describes the layout of a CSA in terms of its | |
32 * {@linkplain #size size}, {@linkplain #slotSize slot size} and | |
33 * the {@linkplain #registers callee save registers} covered by the CSA. | |
34 */ | |
35 public class CiCalleeSaveLayout { | |
36 | |
37 /** | |
38 * The size (in bytes) of the CSA. | |
39 */ | |
40 public final int size; | |
41 | |
42 /** | |
43 * The size (in bytes) of an {@linkplain #registerAtIndex(int) indexable} slot in the CSA. | |
44 */ | |
45 public final int slotSize; | |
46 | |
47 /** | |
48 * Map from {@linkplain CiRegister#number register numbers} to slot indexes in the CSA. | |
49 */ | |
50 private final int[] regNumToIndex; | |
51 | |
52 private final CiRegister[] indexToReg; | |
53 | |
54 /** | |
55 * The list of registers {@linkplain #contains(CiRegister) contained} by this CSA. | |
56 */ | |
57 public final CiRegister[] registers; | |
58 | |
59 /** | |
60 * The offset from the frame pointer to the CSA. If this is not known, then this field | |
61 * will have the value {@link Integer#MAX_VALUE}. | |
62 */ | |
63 public final int frameOffsetToCSA; | |
64 | |
65 /** | |
66 * Creates a CSA layout. | |
67 * | |
68 * @param size size (in bytes) of the CSA. If this is {@code -1}, then the CSA size will be computed from {@code registers}. | |
69 * @param slotSize the size (in bytes) of an {@linkplain #registerAtIndex(int) indexable} slot in the CSA | |
70 * @param registers the registers that can be saved in the CSA | |
71 */ | |
72 public CiCalleeSaveLayout(int frameOffsetToCSA, int size, int slotSize, CiRegister... registers) { | |
73 this.frameOffsetToCSA = frameOffsetToCSA; | |
74 assert slotSize == 0 || CiUtil.isPowerOf2(slotSize); | |
75 this.slotSize = slotSize; | |
76 int maxRegNum = -1; | |
77 int maxOffset = 0; | |
78 this.registers = registers; | |
79 int offset = 0; | |
80 for (CiRegister reg : registers) { | |
81 assert offset % slotSize == 0; | |
82 assert reg.number >= 0; | |
83 if (reg.number > maxRegNum) { | |
84 maxRegNum = reg.number; | |
85 } | |
86 if (offset > maxOffset) { | |
87 maxOffset = offset; | |
88 } | |
89 offset += reg.spillSlotSize; | |
90 } | |
91 if (size == -1) { | |
92 this.size = offset; | |
93 } else { | |
94 assert offset <= size; | |
95 this.size = size; | |
96 } | |
97 size = this.size; | |
98 | |
99 this.regNumToIndex = new int[maxRegNum + 1]; | |
100 this.indexToReg = offset == 0 ? new CiRegister[0] : new CiRegister[offset / slotSize]; | |
101 Arrays.fill(regNumToIndex, -1); | |
102 offset = 0; | |
103 for (CiRegister reg : registers) { | |
104 int index = offset / slotSize; | |
105 regNumToIndex[reg.number] = index; | |
106 indexToReg[index] = reg; | |
107 offset += reg.spillSlotSize; | |
108 } | |
109 } | |
110 | |
111 /** | |
112 * Gets the offset of a given register in the CSA. | |
113 * | |
114 * @return the offset (in bytes) of {@code reg} in the CSA | |
115 * @throws IllegalArgumentException if {@code reg} does not have a slot in the CSA | |
116 */ | |
117 public int offsetOf(int reg) { | |
118 return indexOf(reg) * slotSize; | |
119 } | |
120 | |
121 /** | |
122 * Gets the index of a given register in the CSA. | |
123 * | |
124 * @return the index of {@code reg} in the CSA | |
125 * @throws IllegalArgumentException if {@code reg} does not have a slot in the CSA | |
126 */ | |
127 public int indexOf(int reg) { | |
128 if (!contains(reg)) { | |
129 throw new IllegalArgumentException(String.valueOf(reg)); | |
130 } | |
131 return regNumToIndex[reg]; | |
132 } | |
133 | |
134 /** | |
135 * Gets the offset of a given register in the CSA. | |
136 * | |
137 * @return the offset (in bytes) of {@code reg} in the CSA | |
138 * @throws IllegalArgumentException if {@code reg} does not have a slot in the CSA | |
139 */ | |
140 public int offsetOf(CiRegister reg) { | |
141 return offsetOf(reg.number); | |
142 } | |
143 | |
144 /** | |
145 * Determines if the CSA includes a slot for a given register. | |
146 * | |
147 * @param reg the register to test | |
148 * @return true if the CSA contains a slot for {@code reg} | |
149 */ | |
150 public boolean contains(int reg) { | |
151 return reg >= 0 && reg < regNumToIndex.length && regNumToIndex[reg] != -1; | |
152 } | |
153 | |
154 /** | |
155 * Gets the register whose slot in the CSA is at a given index. | |
156 * | |
157 * @param index an index of a slot in the CSA | |
158 * @return the register whose slot in the CSA is at {@code index} or {@code null} if {@code index} does not denote a | |
159 * slot in the CSA aligned with a register | |
160 */ | |
161 public CiRegister registerAt(int index) { | |
162 if (index < 0 || index >= indexToReg.length) { | |
163 return null; | |
164 } | |
165 return indexToReg[index]; | |
166 } | |
167 | |
168 @Override | |
169 public String toString() { | |
170 StringBuilder sb = new StringBuilder("["); | |
171 for (CiRegister reg : registers) { | |
172 if (sb.length() != 1) { | |
173 sb.append(", "); | |
174 } | |
175 sb.append(reg).append("{+").append(offsetOf(reg)).append('}'); | |
176 } | |
177 return sb.append("] size=").append(size).toString(); | |
178 } | |
179 } |