1 /*
2 * Copyright (c) 2013, 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
24
25 package org.graalvm.compiler.replacements.amd64;
26
27 import org.graalvm.compiler.api.replacements.ClassSubstitution;
28 import org.graalvm.compiler.api.replacements.Fold;
29 import org.graalvm.compiler.api.replacements.Fold.InjectedParameter;
30 import org.graalvm.compiler.api.replacements.MethodSubstitution;
31 import org.graalvm.compiler.core.common.SuppressFBWarnings;
32 import org.graalvm.compiler.core.common.spi.ArrayOffsetProvider;
33 import org.graalvm.compiler.graph.Node.ConstantNodeParameter;
34 import org.graalvm.compiler.replacements.StringSubstitutions;
35 import org.graalvm.compiler.replacements.nodes.ArrayCompareToNode;
36 import org.graalvm.compiler.word.Word;
37 import jdk.internal.vm.compiler.word.Pointer;
38
39 import jdk.vm.ci.meta.JavaKind;
40
41 // JaCoCo Exclude
42
43 /**
44 * Substitutions for {@link java.lang.String} methods.
45 */
46 @ClassSubstitution(String.class)
47 public class AMD64StringSubstitutions {
48
49 @Fold
50 static int charArrayBaseOffset(@InjectedParameter ArrayOffsetProvider arrayOffsetProvider) {
51 return arrayOffsetProvider.arrayBaseOffset(JavaKind.Char);
52 }
53
54 @Fold
55 static int charArrayIndexScale(@InjectedParameter ArrayOffsetProvider arrayOffsetProvider) {
56 return arrayOffsetProvider.arrayScalingFactor(JavaKind.Char);
57 }
58
59 /** Marker value for the {@link InjectedParameter} injected parameter. */
60 static final ArrayOffsetProvider INJECTED = null;
61
62 // Only exists in JDK <= 8
63 @MethodSubstitution(isStatic = true, optional = true)
64 public static int indexOf(char[] source, int sourceOffset, int sourceCount,
65 @ConstantNodeParameter char[] target, int targetOffset, int targetCount,
66 int origFromIndex) {
67 int fromIndex = origFromIndex;
68 if (fromIndex >= sourceCount) {
69 return (targetCount == 0 ? sourceCount : -1);
70 }
71 if (fromIndex < 0) {
72 fromIndex = 0;
73 }
74 if (targetCount == 0) {
75 // The empty string is in every string.
76 return fromIndex;
77 }
78
79 int totalOffset = sourceOffset + fromIndex;
80 if (sourceCount - fromIndex < targetCount) {
81 // The empty string contains nothing except the empty string.
82 return -1;
83 }
84 assert sourceCount - fromIndex > 0 && targetCount > 0;
85
86 Pointer sourcePointer = Word.objectToTrackedPointer(source).add(charArrayBaseOffset(INJECTED)).add(totalOffset * charArrayIndexScale(INJECTED));
87 Pointer targetPointer = Word.objectToTrackedPointer(target).add(charArrayBaseOffset(INJECTED)).add(targetOffset * charArrayIndexScale(INJECTED));
88 int result = AMD64StringIndexOfNode.optimizedStringIndexPointer(sourcePointer, sourceCount - fromIndex, targetPointer, targetCount);
89 if (result >= 0) {
90 return result + totalOffset;
91 }
92 return result;
93 }
94
95 // Only exists in JDK <= 8
96 @MethodSubstitution(isStatic = false, optional = true)
97 public static int indexOf(String source, int ch, int origFromIndex) {
98 int fromIndex = origFromIndex;
99 final int sourceCount = source.length();
100 if (fromIndex >= sourceCount) {
101 // Note: fromIndex might be near -1>>>1.
102 return -1;
103 }
104 if (fromIndex < 0) {
105 fromIndex = 0;
106 }
107
108 if (ch < Character.MIN_SUPPLEMENTARY_CODE_POINT) {
109 char[] sourceArray = StringSubstitutions.getValue(source);
110
111 Pointer sourcePointer = Word.objectToTrackedPointer(sourceArray).add(charArrayBaseOffset(INJECTED)).add(fromIndex * charArrayIndexScale(INJECTED));
112 int result = AMD64ArrayIndexOfNode.optimizedArrayIndexOf(sourcePointer, sourceCount - fromIndex, (char) ch, JavaKind.Char);
113 if (result != -1) {
114 return result + fromIndex;
115 }
116 return result;
117 } else {
118 return indexOf(source, ch, origFromIndex);
119 }
120 }
121
122 @MethodSubstitution(isStatic = false)
123 @SuppressFBWarnings(value = "ES_COMPARING_PARAMETER_STRING_WITH_EQ", justification = "reference equality on the receiver is what we want")
124 public static int compareTo(String receiver, String anotherString) {
125 if (receiver == anotherString) {
126 return 0;
127 }
128 char[] value = StringSubstitutions.getValue(receiver);
129 char[] other = StringSubstitutions.getValue(anotherString);
130 return ArrayCompareToNode.compareTo(value, other, value.length << 1, other.length << 1, JavaKind.Char, JavaKind.Char);
131 }
132
133 }