Mercurial > jdk8-mips64-public > langtools / file revision
src/share/classes/com/sun/tools/javac/jvm/Pool.java@9b26c96f5138
src/share/classes/com/sun/tools/javac/jvm/Pool.java
Fri, 30 Nov 2012 15:14:36 +0000
- author
- mcimadamore
- date
- Fri, 30 Nov 2012 15:14:36 +0000
- changeset 1435
- 9b26c96f5138
- parent 1415
- 01c9d4161882
- child 1452
- de1ec6fc93fe
- permissions
- -rw-r--r--
8004101: Add checks for method reference well-formedness
Summary: Bring method reference type-checking in sync with latest EDR
Reviewed-by: jjg
1 /*
2 * Copyright (c) 1999, 2012, 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. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
26 package com.sun.tools.javac.jvm;
28 import com.sun.tools.javac.code.Kinds;
29 import com.sun.tools.javac.code.Symbol;
30 import com.sun.tools.javac.code.Symbol.*;
32 import com.sun.tools.javac.util.ArrayUtils;
33 import com.sun.tools.javac.util.Assert;
34 import com.sun.tools.javac.util.Filter;
35 import com.sun.tools.javac.util.Name;
37 import java.util.*;
39 /** An internal structure that corresponds to the constant pool of a classfile.
40 *
41 * <p><b>This is NOT part of any supported API.
42 * If you write code that depends on this, you do so at your own risk.
43 * This code and its internal interfaces are subject to change or
44 * deletion without notice.</b>
45 */
46 public class Pool {
48 public static final int MAX_ENTRIES = 0xFFFF;
49 public static final int MAX_STRING_LENGTH = 0xFFFF;
51 /** Index of next constant to be entered.
52 */
53 int pp;
55 /** The initial pool buffer.
56 */
57 Object[] pool;
59 /** A hashtable containing all constants in the pool.
60 */
61 Map<Object,Integer> indices;
63 /** Construct a pool with given number of elements and element array.
64 */
65 public Pool(int pp, Object[] pool) {
66 this.pp = pp;
67 this.pool = pool;
68 this.indices = new HashMap<Object,Integer>(pool.length);
69 for (int i = 1; i < pp; i++) {
70 if (pool[i] != null) indices.put(pool[i], i);
71 }
72 }
74 /** Construct an empty pool.
75 */
76 public Pool() {
77 this(1, new Object[64]);
78 }
80 /** Return the number of entries in the constant pool.
81 */
82 public int numEntries() {
83 return pp;
84 }
86 /** Remove everything from this pool.
87 */
88 public void reset() {
89 pp = 1;
90 indices.clear();
91 }
93 /** Place an object in the pool, unless it is already there.
94 * If object is a symbol also enter its owner unless the owner is a
95 * package. Return the object's index in the pool.
96 */
97 public int put(Object value) {
98 value = makePoolValue(value);
99 // assert !(value instanceof Type.TypeVar);
100 Integer index = indices.get(value);
101 if (index == null) {
102 // System.err.println("put " + value + " " + value.getClass());//DEBUG
103 index = pp;
104 indices.put(value, index);
105 pool = ArrayUtils.ensureCapacity(pool, pp);
106 pool[pp++] = value;
107 if (value instanceof Long || value instanceof Double) {
108 pool = ArrayUtils.ensureCapacity(pool, pp);
109 pool[pp++] = null;
110 }
111 }
112 return index.intValue();
113 }
115 Object makePoolValue(Object o) {
116 if (o instanceof DynamicMethodSymbol) {
117 return new DynamicMethod((DynamicMethodSymbol)o);
118 } else if (o instanceof MethodSymbol) {
119 return new Method((MethodSymbol)o);
120 } else if (o instanceof VarSymbol) {
121 return new Variable((VarSymbol)o);
122 } else {
123 return o;
124 }
125 }
127 /** Return the given object's index in the pool,
128 * or -1 if object is not in there.
129 */
130 public int get(Object o) {
131 Integer n = indices.get(o);
132 return n == null ? -1 : n.intValue();
133 }
135 static class Method extends DelegatedSymbol {
136 MethodSymbol m;
137 Method(MethodSymbol m) {
138 super(m);
139 this.m = m;
140 }
141 public boolean equals(Object other) {
142 if (!(other instanceof Method)) return false;
143 MethodSymbol o = ((Method)other).m;
144 return
145 o.name == m.name &&
146 o.owner == m.owner &&
147 o.type.equals(m.type);
148 }
149 public int hashCode() {
150 return
151 m.name.hashCode() * 33 +
152 m.owner.hashCode() * 9 +
153 m.type.hashCode();
154 }
155 }
157 static class DynamicMethod extends Method {
159 DynamicMethod(DynamicMethodSymbol m) {
160 super(m);
161 }
163 @Override
164 public boolean equals(Object other) {
165 if (!super.equals(other)) return false;
166 if (!(other instanceof DynamicMethod)) return false;
167 DynamicMethodSymbol dm1 = (DynamicMethodSymbol)m;
168 DynamicMethodSymbol dm2 = (DynamicMethodSymbol)((DynamicMethod)other).m;
169 return dm1.bsm == dm2.bsm &&
170 dm1.bsmKind == dm2.bsmKind &&
171 Arrays.equals(dm1.staticArgs, dm2.staticArgs);
172 }
174 @Override
175 public int hashCode() {
176 int hash = super.hashCode();
177 DynamicMethodSymbol dm = (DynamicMethodSymbol)m;
178 hash += dm.bsmKind * 7 +
179 dm.bsm.hashCode() * 11;
180 for (int i = 0; i < dm.staticArgs.length; i++) {
181 hash += (dm.staticArgs[i].hashCode() * 23);
182 }
183 return hash;
184 }
185 }
187 static class Variable extends DelegatedSymbol {
188 VarSymbol v;
189 Variable(VarSymbol v) {
190 super(v);
191 this.v = v;
192 }
193 public boolean equals(Object other) {
194 if (!(other instanceof Variable)) return false;
195 VarSymbol o = ((Variable)other).v;
196 return
197 o.name == v.name &&
198 o.owner == v.owner &&
199 o.type.equals(v.type);
200 }
201 public int hashCode() {
202 return
203 v.name.hashCode() * 33 +
204 v.owner.hashCode() * 9 +
205 v.type.hashCode();
206 }
207 }
209 public static class MethodHandle {
211 /** Reference kind - see ClassFile */
212 int refKind;
214 /** Reference symbol */
215 Symbol refSym;
217 public MethodHandle(int refKind, Symbol refSym) {
218 this.refKind = refKind;
219 this.refSym = refSym;
220 checkConsistent();
221 }
222 public boolean equals(Object other) {
223 if (!(other instanceof MethodHandle)) return false;
224 MethodHandle mr = (MethodHandle) other;
225 if (mr.refKind != refKind) return false;
226 Symbol o = mr.refSym;
227 return
228 o.name == refSym.name &&
229 o.owner == refSym.owner &&
230 o.type.equals(refSym.type);
231 }
232 public int hashCode() {
233 return
234 refKind * 65 +
235 refSym.name.hashCode() * 33 +
236 refSym.owner.hashCode() * 9 +
237 refSym.type.hashCode();
238 }
240 /**
241 * Check consistency of reference kind and symbol (see JVMS 4.4.8)
242 */
243 @SuppressWarnings("fallthrough")
244 private void checkConsistent() {
245 boolean staticOk = false;
246 int expectedKind = -1;
247 Filter<Name> nameFilter = nonInitFilter;
248 boolean interfaceOwner = false;
249 switch (refKind) {
250 case ClassFile.REF_getStatic:
251 case ClassFile.REF_putStatic:
252 staticOk = true;
253 case ClassFile.REF_getField:
254 case ClassFile.REF_putField:
255 expectedKind = Kinds.VAR;
256 break;
257 case ClassFile.REF_newInvokeSpecial:
258 nameFilter = initFilter;
259 expectedKind = Kinds.MTH;
260 break;
261 case ClassFile.REF_invokeInterface:
262 interfaceOwner = true;
263 expectedKind = Kinds.MTH;
264 break;
265 case ClassFile.REF_invokeStatic:
266 staticOk = true;
267 case ClassFile.REF_invokeVirtual:
268 case ClassFile.REF_invokeSpecial:
269 expectedKind = Kinds.MTH;
270 break;
271 }
272 Assert.check(!refSym.isStatic() || staticOk);
273 Assert.check(refSym.kind == expectedKind);
274 Assert.check(nameFilter.accepts(refSym.name));
275 Assert.check(!refSym.owner.isInterface() || interfaceOwner);
276 }
277 //where
278 Filter<Name> nonInitFilter = new Filter<Name>() {
279 public boolean accepts(Name n) {
280 return n != n.table.names.init && n != n.table.names.clinit;
281 }
282 };
284 Filter<Name> initFilter = new Filter<Name>() {
285 public boolean accepts(Name n) {
286 return n == n.table.names.init;
287 }
288 };
289 }
290 }
