1 /*
2 * Copyright (c) 2011, 2018, 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
24
25 package org.graalvm.compiler.lir;
26
27 import static jdk.vm.ci.code.ValueUtil.asRegister;
28 import static jdk.vm.ci.code.ValueUtil.isRegister;
29
30 import java.util.ArrayList;
31 import java.util.List;
32
33 import jdk.vm.ci.code.Register;
34 import jdk.vm.ci.code.RegisterValue;
35 import jdk.vm.ci.code.StackSlot;
36 import jdk.vm.ci.meta.Constant;
37 import jdk.vm.ci.meta.JavaConstant;
38 import jdk.vm.ci.meta.Value;
39
40 public final class LIRValueUtil {
41
42 public static boolean isVariable(Value value) {
43 assert value != null;
44 return value instanceof Variable;
45 }
46
47 public static Variable asVariable(Value value) {
48 assert value != null;
49 return (Variable) value;
50 }
51
52 public static boolean isConstantValue(Value value) {
53 assert value != null;
54 return value instanceof ConstantValue;
55 }
56
57 public static ConstantValue asConstantValue(Value value) {
58 assert value != null;
59 return (ConstantValue) value;
60 }
61
62 public static Constant asConstant(Value value) {
63 return asConstantValue(value).getConstant();
64 }
65
66 public static boolean isJavaConstant(Value value) {
67 return isConstantValue(value) && asConstantValue(value).isJavaConstant();
68 }
69
70 public static JavaConstant asJavaConstant(Value value) {
71 return asConstantValue(value).getJavaConstant();
72 }
73
74 public static boolean isNullConstant(Value value) {
75 assert value != null;
76 return isJavaConstant(value) && asJavaConstant(value).isNull();
77 }
78
79 public static boolean isIntConstant(Value value, long expected) {
80 if (isJavaConstant(value)) {
81 JavaConstant javaConstant = asJavaConstant(value);
82 if (javaConstant != null && javaConstant.getJavaKind().isNumericInteger()) {
83 return javaConstant.asLong() == expected;
84 }
85 }
86 return false;
87 }
88
89 public static boolean isStackSlotValue(Value value) {
90 assert value != null;
91 return value instanceof StackSlot || value instanceof VirtualStackSlot;
92 }
93
94 public static boolean isVirtualStackSlot(Value value) {
95 assert value != null;
96 return value instanceof VirtualStackSlot;
97 }
98
99 public static VirtualStackSlot asVirtualStackSlot(Value value) {
100 assert value != null;
101 return (VirtualStackSlot) value;
102 }
103
104 public static boolean sameRegister(Value v1, Value v2) {
105 return isRegister(v1) && isRegister(v2) && asRegister(v1).equals(asRegister(v2));
106 }
107
108 public static boolean sameRegister(Value v1, Value v2, Value v3) {
109 return sameRegister(v1, v2) && sameRegister(v1, v3);
110 }
111
112 /**
113 * Checks if all the provided values are different physical registers. The parameters can be
114 * either {@link Register registers}, {@link Value values} or arrays of them. All values that
115 * are not {@link RegisterValue registers} are ignored.
116 */
117 public static boolean differentRegisters(Object... values) {
118 List<Register> registers = collectRegisters(values, new ArrayList<Register>());
119 for (int i = 1; i < registers.size(); i++) {
120 Register r1 = registers.get(i);
121 for (int j = 0; j < i; j++) {
122 Register r2 = registers.get(j);
123 if (r1.equals(r2)) {
124 return false;
125 }
126 }
127 }
128 return true;
129 }
130
131 private static List<Register> collectRegisters(Object[] values, List<Register> registers) {
132 for (Object o : values) {
133 if (o instanceof Register) {
134 registers.add((Register) o);
135 } else if (o instanceof Value) {
136 if (isRegister((Value) o)) {
137 registers.add(asRegister((Value) o));
138 }
139 } else if (o instanceof Object[]) {
140 collectRegisters((Object[]) o, registers);
141 } else {
142 throw new IllegalArgumentException("Not a Register or Value: " + o);
143 }
144 }
145 return registers;
146 }
147
148 /**
149 * Subtract sets of registers (x - y).
150 *
151 * @param x a set of register to subtract from.
152 * @param y a set of registers to subtract.
153 * @return resulting set of registers (x - y).
154 */
155 public static Value[] subtractRegisters(Value[] x, Value[] y) {
156 ArrayList<Value> result = new ArrayList<>(x.length);
157 for (Value i : x) {
158 boolean append = true;
159 for (Value j : y) {
160 if (sameRegister(i, j)) {
161 append = false;
162 break;
163 }
164 }
165 if (append) {
166 result.add(i);
167 }
168 }
169 Value[] resultArray = new Value[result.size()];
170 return result.toArray(resultArray);
171 }
172 }