Mercurial > hg > truffle

comparison jvmci/com.oracle.jvmci.code/src/com/oracle/jvmci/code/RegisterSaveLayout.java @ 21798:395ac43a8578

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
moved JVMCI sources from graal/ to jvmci/ directory
author Doug Simon <doug.simon@oracle.com>
date Tue, 09 Jun 2015 00:22:49 +0200
parents graal/com.oracle.jvmci.code/src/com/oracle/jvmci/code/RegisterSaveLayout.java@48c1ebd24120
children
comparison
equal deleted inserted replaced
21797:42452d2dfbec 21798:395ac43a8578
1 /*
2 * Copyright (c) 2013, 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 java.util.*;
26
27 /**
28 * A map from registers to frame slots. This can be used to describe where callee saved registers
29 * are saved in a callee's frame.
30 */
31 public final class RegisterSaveLayout {
32
33 /**
34 * Keys.
35 */
36 private final Register[] registers;
37
38 /**
39 * Slot indexes relative to stack pointer.
40 */
41 private final int[] slots;
42
43 /**
44 * Creates a map from registers to frame slots.
45 *
46 * @param registers the keys in the map
47 * @param slots frame slot index for each register in {@code registers}
48 */
49 public RegisterSaveLayout(Register[] registers, int[] slots) {
50 assert registers.length == slots.length;
51 this.registers = registers;
52 this.slots = slots;
53 assert registersToSlots(false).size() == registers.length : "non-unique registers";
54 assert new HashSet<>(registersToSlots(false).values()).size() == slots.length : "non-unqiue slots";
55 }
56
57 /**
58 * Gets the frame slot index for a given register.
59 *
60 * @param register register to get the frame slot index for
61 * @return frame slot index
62 */
63 public int registerToSlot(Register register) {
64 for (int i = 0; i < registers.length; i++) {
65 if (register.equals(registers[i])) {
66 return slots[i];
67 }
68 }
69 throw new IllegalArgumentException(register + " not saved by this layout: " + this);
70 }
71
72 /**
73 * Gets this layout information as a {@link Map} from registers to slots.
74 */
75 public Map<Register, Integer> registersToSlots(boolean sorted) {
76 Map<Register, Integer> result;
77 if (sorted) {
78 result = new TreeMap<>();
79 } else {
80 result = new HashMap<>();
81 }
82 for (int i = 0; i < registers.length; i++) {
83 result.put(registers[i], slots[i]);
84 }
85 return result;
86 }
87
88 /**
89 * Gets this layout information as a {@link Map} from slots to registers.
90 */
91 public Map<Integer, Register> slotsToRegisters(boolean sorted) {
92 Map<Integer, Register> result;
93 if (sorted) {
94 result = new TreeMap<>();
95 } else {
96 result = new HashMap<>();
97 }
98 for (int i = 0; i < registers.length; i++) {
99 result.put(slots[i], registers[i]);
100 }
101 return result;
102 }
103
104 @Override
105 public int hashCode() {
106 throw new UnsupportedOperationException();
107 }
108
109 @Override
110 public boolean equals(Object obj) {
111 if (this == obj) {
112 return true;
113 }
114 if (obj instanceof RegisterSaveLayout) {
115 RegisterSaveLayout that = (RegisterSaveLayout) obj;
116 if (Arrays.equals(registers, that.registers) && Arrays.equals(slots, that.slots)) {
117 return true;
118 }
119 }
120 return false;
121 }
122
123 @Override
124 public String toString() {
125 return registersToSlots(true).toString();
126 }
127 }