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comparison graal/com.oracle.jvmci.code/src/com/oracle/jvmci/code/RegisterAttributes.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/RegisterAttributes.java@1cde96b96673
children
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21555:d12eaef9af72 21556:48c1ebd24120
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.jvmci.code;
24
25 import java.util.*;
26
27 /**
28 * A collection of register attributes. The specific attribute values for a register may be local to
29 * a compilation context. For example, a {@link RegisterConfig} in use during a compilation will
30 * determine which registers are callee saved.
31 */
32 public class RegisterAttributes {
33
34 private final boolean callerSave;
35 private final boolean calleeSave;
36 private final boolean allocatable;
37
38 public RegisterAttributes(boolean isCallerSave, boolean isCalleeSave, boolean isAllocatable) {
39 this.callerSave = isCallerSave;
40 this.calleeSave = isCalleeSave;
41 this.allocatable = isAllocatable;
42 }
43
44 public static final RegisterAttributes NONE = new RegisterAttributes(false, false, false);
45
46 /**
47 * Creates a map from register {@linkplain Register#number numbers} to register
48 * {@linkplain RegisterAttributes attributes} for a given register configuration and set of
49 * registers.
50 *
51 * @param registerConfig a register configuration
52 * @param registers a set of registers
53 * @return an array whose length is the max register number in {@code registers} plus 1. An
54 * element at index i holds the attributes of the register whose number is i.
55 */
56 public static RegisterAttributes[] createMap(RegisterConfig registerConfig, Register[] registers) {
57 RegisterAttributes[] map = new RegisterAttributes[registers.length];
58 for (Register reg : registers) {
59 if (reg != null) {
60 CalleeSaveLayout csl = registerConfig.getCalleeSaveLayout();
61 RegisterAttributes attr = new RegisterAttributes(Arrays.asList(registerConfig.getCallerSaveRegisters()).contains(reg),
62 csl == null ? false : Arrays.asList(csl.registers).contains(reg), Arrays.asList(registerConfig.getAllocatableRegisters()).contains(reg));
63 if (map.length <= reg.number) {
64 map = Arrays.copyOf(map, reg.number + 1);
65 }
66 map[reg.number] = attr;
67 }
68 }
69 for (int i = 0; i < map.length; i++) {
70 if (map[i] == null) {
71 map[i] = NONE;
72 }
73 }
74 return map;
75 }
76
77 /**
78 * @return Denotes a register that is available for use by a register allocator.
79 */
80 public boolean isAllocatable() {
81 return allocatable;
82 }
83
84 /**
85 * @return Denotes a register whose value preservation (if required) across a call is the
86 * responsibility of the callee.
87 */
88 public boolean isCalleeSave() {
89 return calleeSave;
90 }
91
92 /**
93 * @return Denotes a register whose value preservation (if required) across a call is the
94 * responsibility of the caller.
95 */
96 public boolean isCallerSave() {
97 return callerSave;
98 }
99 }