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comparison graal/com.oracle.max.cri/src/com/oracle/max/cri/ri/RiRegisterAttributes.java @ 4199:aaac4894175c

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Renamed cri packages from sun to oracle.
author Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
date Tue, 03 Jan 2012 16:29:28 +0100
parents graal/com.oracle.max.cri/src/com/sun/cri/ri/RiRegisterAttributes.java@e233f5660da4
children
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4198:8c9c0e1eaab1 4199:aaac4894175c
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.oracle.max.cri.ri;
24
25 import java.util.*;
26
27 import com.oracle.max.cri.ci.*;
28
29 /**
30 * A collection of register attributes. The specific attribute values for a register may be
31 * local to a compilation context. For example, a {@link RiRegisterConfig} in use during
32 * a compilation will determine which registers are callee saved.
33 */
34 public class RiRegisterAttributes {
35
36 /**
37 * Denotes a register whose value preservation (if required) across a call is the responsibility of the caller.
38 */
39 public final boolean isCallerSave;
40
41 /**
42 * Denotes a register whose value preservation (if required) across a call is the responsibility of the callee.
43 */
44 public final boolean isCalleeSave;
45
46 /**
47 * Denotes a register that is available for use by a register allocator.
48 */
49 public final boolean isAllocatable;
50
51 /**
52 * Denotes a register guaranteed to be non-zero if read in compiled Java code.
53 * For example, a register dedicated to holding the current thread.
54 */
55 public boolean isNonZero;
56
57 public RiRegisterAttributes(boolean isCallerSave, boolean isCalleeSave, boolean isAllocatable) {
58 this.isCallerSave = isCallerSave;
59 this.isCalleeSave = isCalleeSave;
60 this.isAllocatable = isAllocatable;
61 }
62
63 public static final RiRegisterAttributes NONE = new RiRegisterAttributes(false, false, false);
64
65 /**
66 * Creates a map from register {@linkplain CiRegister#number numbers} to register
67 * {@linkplain RiRegisterAttributes attributes} for a given register configuration and set of
68 * registers.
69 *
70 * @param registerConfig a register configuration
71 * @param registers a set of registers
72 * @return an array whose length is the max register number in {@code registers} plus 1. An element at index i holds
73 * the attributes of the register whose number is i.
74 */
75 public static RiRegisterAttributes[] createMap(RiRegisterConfig registerConfig, CiRegister[] registers) {
76 RiRegisterAttributes[] map = new RiRegisterAttributes[registers.length];
77 for (CiRegister reg : registers) {
78 if (reg != null) {
79 CiCalleeSaveLayout csl = registerConfig.getCalleeSaveLayout();
80 RiRegisterAttributes attr = new RiRegisterAttributes(
81 Arrays.asList(registerConfig.getCallerSaveRegisters()).contains(reg),
82 csl == null ? false : Arrays.asList(csl.registers).contains(reg),
83 Arrays.asList(registerConfig.getAllocatableRegisters()).contains(reg));
84 if (map.length <= reg.number) {
85 map = Arrays.copyOf(map, reg.number + 1);
86 }
87 map[reg.number] = attr;
88 }
89 }
90 for (int i = 0; i < map.length; i++) {
91 if (map[i] == null) {
92 map[i] = NONE;
93 }
94 }
95 return map;
96 }
97 }