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comparison jvmci/jdk.vm.ci.code/src/jdk/vm/ci/code/ValueUtil.java @ 22672:1bbd4a7c274b

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Rename jdk.internal.jvmci to jdk.vm.ci
author Tom Rodriguez <tom.rodriguez@oracle.com>
date Thu, 08 Oct 2015 17:28:41 -0700
parents jvmci/jdk.internal.jvmci.code/src/jdk/internal/jvmci/code/ValueUtil.java@6a7f2f656ed9
children f48b657b550d
comparison
equal deleted inserted replaced
22671:97f30e4d0e95 22672:1bbd4a7c274b
1 /*
2 * Copyright (c) 2012, 2015, 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 jdk.vm.ci.code;
24
25 import java.util.ArrayList;
26 import java.util.List;
27
28 import jdk.vm.ci.meta.AllocatableValue;
29 import jdk.vm.ci.meta.JavaConstant;
30 import jdk.vm.ci.meta.JavaValue;
31 import jdk.vm.ci.meta.PlatformKind;
32 import jdk.vm.ci.meta.Value;
33
34 /**
35 * Utility class for working with the {@link Value} class and its subclasses.
36 */
37 public final class ValueUtil {
38
39 public static boolean isIllegal(Value value) {
40 assert value != null;
41 return Value.ILLEGAL.equals(value);
42 }
43
44 public static boolean isIllegalJavaValue(JavaValue value) {
45 assert value != null;
46 return Value.ILLEGAL.equals(value);
47 }
48
49 public static boolean isLegal(Value value) {
50 return !isIllegal(value);
51 }
52
53 public static boolean isVirtualObject(JavaValue value) {
54 assert value != null;
55 return value instanceof VirtualObject;
56 }
57
58 public static VirtualObject asVirtualObject(JavaValue value) {
59 assert value != null;
60 return (VirtualObject) value;
61 }
62
63 public static boolean isConstantJavaValue(JavaValue value) {
64 assert value != null;
65 return value instanceof JavaConstant;
66 }
67
68 public static JavaConstant asConstantJavaValue(JavaValue value) {
69 assert value != null;
70 return (JavaConstant) value;
71 }
72
73 public static boolean isAllocatableValue(Value value) {
74 assert value != null;
75 return value instanceof AllocatableValue;
76 }
77
78 public static AllocatableValue asAllocatableValue(Value value) {
79 assert value != null;
80 return (AllocatableValue) value;
81 }
82
83 public static boolean isStackSlot(Value value) {
84 assert value != null;
85 return value instanceof StackSlot;
86 }
87
88 public static StackSlot asStackSlot(Value value) {
89 assert value != null;
90 return (StackSlot) value;
91 }
92
93 public static boolean isStackSlotValue(Value value) {
94 assert value != null;
95 return value instanceof StackSlotValue;
96 }
97
98 public static StackSlotValue asStackSlotValue(Value value) {
99 assert value != null;
100 return (StackSlotValue) value;
101 }
102
103 public static boolean isVirtualStackSlot(Value value) {
104 assert value != null;
105 return value instanceof VirtualStackSlot;
106 }
107
108 public static VirtualStackSlot asVirtualStackSlot(Value value) {
109 assert value != null;
110 return (VirtualStackSlot) value;
111 }
112
113 public static boolean isRegister(Value value) {
114 assert value != null;
115 return value instanceof RegisterValue;
116 }
117
118 public static Register asRegister(Value value) {
119 return asRegisterValue(value).getRegister();
120 }
121
122 public static RegisterValue asRegisterValue(Value value) {
123 assert value != null;
124 return (RegisterValue) value;
125 }
126
127 public static Register asRegister(Value value, PlatformKind kind) {
128 if (value.getPlatformKind() != kind) {
129 throw new InternalError("needed: " + kind + " got: " + value.getPlatformKind());
130 } else {
131 return asRegister(value);
132 }
133 }
134
135 public static boolean sameRegister(Value v1, Value v2) {
136 return isRegister(v1) && isRegister(v2) && asRegister(v1).equals(asRegister(v2));
137 }
138
139 public static boolean sameRegister(Value v1, Value v2, Value v3) {
140 return sameRegister(v1, v2) && sameRegister(v1, v3);
141 }
142
143 /**
144 * Checks if all the provided values are different physical registers. The parameters can be
145 * either {@link Register registers}, {@link Value values} or arrays of them. All values that
146 * are not {@link RegisterValue registers} are ignored.
147 */
148 public static boolean differentRegisters(Object... values) {
149 List<Register> registers = collectRegisters(values, new ArrayList<Register>());
150 for (int i = 1; i < registers.size(); i++) {
151 Register r1 = registers.get(i);
152 for (int j = 0; j < i; j++) {
153 Register r2 = registers.get(j);
154 if (r1.equals(r2)) {
155 return false;
156 }
157 }
158 }
159 return true;
160 }
161
162 private static List<Register> collectRegisters(Object[] values, List<Register> registers) {
163 for (Object o : values) {
164 if (o instanceof Register) {
165 registers.add((Register) o);
166 } else if (o instanceof Value) {
167 if (isRegister((Value) o)) {
168 registers.add(asRegister((Value) o));
169 }
170 } else if (o instanceof Object[]) {
171 collectRegisters((Object[]) o, registers);
172 } else {
173 throw new IllegalArgumentException("Not a Register or Value: " + o);
174 }
175 }
176 return registers;
177 }
178
179 /**
180 * Subtract sets of registers (x - y).
181 *
182 * @param x a set of register to subtract from.
183 * @param y a set of registers to subtract.
184 * @return resulting set of registers (x - y).
185 */
186 public static Value[] subtractRegisters(Value[] x, Value[] y) {
187 ArrayList<Value> result = new ArrayList<>(x.length);
188 for (Value i : x) {
189 boolean append = true;
190 for (Value j : y) {
191 if (ValueUtil.sameRegister(i, j)) {
192 append = false;
193 break;
194 }
195 }
196 if (append) {
197 result.add(i);
198 }
199 }
200 Value[] resultArray = new Value[result.size()];
201 return result.toArray(resultArray);
202 }
203 }