1 /*
2 * Copyright (c) 2011, 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.hotspot;
24
25 import java.util.*;
26
27 import jdk.vm.ci.common.*;
28 import jdk.vm.ci.meta.*;
29
30 /**
31 * Represents a method signature.
32 */
33 public class HotSpotSignature implements Signature {
34
35 private final List<String> parameters = new ArrayList<>();
36 private final String returnType;
37 private final String originalString;
38 private ResolvedJavaType[] parameterTypes;
39 private ResolvedJavaType returnTypeCache;
40 private final HotSpotJVMCIRuntimeProvider runtime;
41
42 public HotSpotSignature(HotSpotJVMCIRuntimeProvider runtime, String signature) {
43 this.runtime = runtime;
44 assert signature.length() > 0;
45 this.originalString = signature;
46
47 if (signature.charAt(0) == '(') {
48 int cur = 1;
49 while (cur < signature.length() && signature.charAt(cur) != ')') {
50 int nextCur = parseSignature(signature, cur);
51 parameters.add(signature.substring(cur, nextCur));
52 cur = nextCur;
53 }
54
55 cur++;
56 int nextCur = parseSignature(signature, cur);
57 returnType = signature.substring(cur, nextCur);
58 assert nextCur == signature.length();
59 } else {
60 returnType = null;
61 }
62 }
63
64 public HotSpotSignature(HotSpotJVMCIRuntimeProvider runtime, ResolvedJavaType returnType, ResolvedJavaType... parameterTypes) {
65 this.runtime = runtime;
66 this.parameterTypes = parameterTypes.clone();
67 this.returnTypeCache = returnType;
68 this.returnType = returnType.getName();
69 StringBuilder sb = new StringBuilder("(");
70 for (JavaType type : parameterTypes) {
71 parameters.add(type.getName());
72 sb.append(type.getName());
73 }
74 sb.append(")").append(returnType.getName());
75 this.originalString = sb.toString();
76 assert new HotSpotSignature(runtime, originalString).equals(this);
77 }
78
79 private static int parseSignature(String signature, int start) {
80 int cur = start;
81 char first;
82 do {
83 first = signature.charAt(cur++);
84 } while (first == '[');
85
86 switch (first) {
87 case 'L':
88 while (signature.charAt(cur) != ';') {
89 cur++;
90 }
91 cur++;
92 break;
93 case 'V':
94 case 'I':
95 case 'B':
96 case 'C':
97 case 'D':
98 case 'F':
99 case 'J':
100 case 'S':
101 case 'Z':
102 break;
103 default:
104 throw new JVMCIError("Invalid character at index %d in signature: %s", cur, signature);
105 }
106 return cur;
107 }
108
109 @Override
110 public int getParameterCount(boolean withReceiver) {
111 return parameters.size() + (withReceiver ? 1 : 0);
112 }
113
114 @Override
115 public JavaKind getParameterKind(int index) {
116 return JavaKind.fromTypeString(parameters.get(index));
117 }
118
119 private static boolean checkValidCache(ResolvedJavaType type, ResolvedJavaType accessingClass) {
120 assert accessingClass != null;
121 if (type == null) {
122 return false;
123 } else if (type instanceof HotSpotResolvedObjectTypeImpl) {
124 return ((HotSpotResolvedObjectTypeImpl) type).isDefinitelyResolvedWithRespectTo(accessingClass);
125 }
126 return true;
127 }
128
129 private static JavaType getUnresolvedOrPrimitiveType(HotSpotJVMCIRuntimeProvider runtime, String name) {
130 if (name.length() == 1) {
131 JavaKind kind = JavaKind.fromPrimitiveOrVoidTypeChar(name.charAt(0));
132 return runtime.getHostJVMCIBackend().getMetaAccess().lookupJavaType(kind.toJavaClass());
133 }
134 return new HotSpotUnresolvedJavaType(name, runtime);
135 }
136
137 @Override
138 public JavaType getParameterType(int index, ResolvedJavaType accessingClass) {
139 if (accessingClass == null) {
140 // Caller doesn't care about resolution context so return an unresolved
141 // or primitive type (primitive type resolution is context free)
142 return getUnresolvedOrPrimitiveType(runtime, parameters.get(index));
143 }
144 if (parameterTypes == null) {
145 parameterTypes = new ResolvedJavaType[parameters.size()];
146 }
147
148 ResolvedJavaType type = parameterTypes[index];
149 if (!checkValidCache(type, accessingClass)) {
150 JavaType result = runtime.lookupType(parameters.get(index), (HotSpotResolvedObjectType) accessingClass, false);
151 if (result instanceof ResolvedJavaType) {
152 type = (ResolvedJavaType) result;
153 parameterTypes[index] = type;
154 } else {
155 return result;
156 }
157 }
158 return type;
159 }
160
161 @Override
162 public String toMethodDescriptor() {
163 assert originalString.equals(Signature.super.toMethodDescriptor());
164 return originalString;
165 }
166
167 @Override
168 public JavaKind getReturnKind() {
169 return JavaKind.fromTypeString(returnType);
170 }
171
172 @Override
173 public JavaType getReturnType(ResolvedJavaType accessingClass) {
174 if (accessingClass == null) {
175 // Caller doesn't care about resolution context so return an unresolved
176 // or primitive type (primitive type resolution is context free)
177 return getUnresolvedOrPrimitiveType(runtime, returnType);
178 }
179 if (!checkValidCache(returnTypeCache, accessingClass)) {
180 JavaType result = runtime.lookupType(returnType, (HotSpotResolvedObjectType) accessingClass, false);
181 if (result instanceof ResolvedJavaType) {
182 returnTypeCache = (ResolvedJavaType) result;
183 } else {
184 return result;
185 }
186 }
187 return returnTypeCache;
188 }
189
190 @Override
191 public String toString() {
192 return "HotSpotSignature<" + originalString + ">";
193 }
194
195 @Override
196 public boolean equals(Object obj) {
197 if (obj instanceof HotSpotSignature) {
198 HotSpotSignature other = (HotSpotSignature) obj;
199 if (other.originalString.equals(originalString)) {
200 assert other.parameters.equals(parameters);
201 assert other.returnType.equals(returnType);
202 return true;
203 }
204 }
205 return false;
206 }
207
208 @Override
209 public int hashCode() {
210 return originalString.hashCode();
211 }
212 }