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src/share/classes/com/sun/tools/classfile/ReferenceFinder.java@8a30511b2ea4 (annotated)

src/share/classes/com/sun/tools/classfile/ReferenceFinder.java

Thu, 04 Aug 2016 23:36:47 -0700

author
asaha
date
Thu, 04 Aug 2016 23:36:47 -0700
changeset 3270
8a30511b2ea4
parent 0
959103a6100f
permissions
-rw-r--r--

8162511: 8u111 L10n resource file updates
Summary: 8u111 L10n resource file updates
Reviewed-by: coffeys
Contributed-by: li.jiang@oracle.com

aoqi@0 1 /*
aoqi@0 2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0 4 *
aoqi@0 5 * This code is free software; you can redistribute it and/or modify it
aoqi@0 6 * under the terms of the GNU General Public License version 2 only, as
aoqi@0 7 * published by the Free Software Foundation. Oracle designates this
aoqi@0 8 * particular file as subject to the "Classpath" exception as provided
aoqi@0 9 * by Oracle in the LICENSE file that accompanied this code.
aoqi@0 10 *
aoqi@0 11 * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0 14 * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0 15 * accompanied this code).
aoqi@0 16 *
aoqi@0 17 * You should have received a copy of the GNU General Public License version
aoqi@0 18 * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0 20 *
aoqi@0 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0 22 * or visit www.oracle.com if you need additional information or have any
aoqi@0 23 * questions.
aoqi@0 24 */
aoqi@0 25
aoqi@0 26 package com.sun.tools.classfile;
aoqi@0 27
aoqi@0 28 import java.util.ArrayList;
aoqi@0 29 import java.util.HashSet;
aoqi@0 30 import java.util.List;
aoqi@0 31 import java.util.Objects;
aoqi@0 32 import java.util.Set;
aoqi@0 33 import com.sun.tools.classfile.Instruction.TypeKind;
aoqi@0 34 import static com.sun.tools.classfile.ConstantPool.*;
aoqi@0 35
aoqi@0 36 /**
aoqi@0 37 * A utility class to find where in a ClassFile references
aoqi@0 38 * a {@link CONSTANT_Methodref_info method},
aoqi@0 39 * a {@link CONSTANT_InterfaceMethodref_info interface method,
aoqi@0 40 * or a {@link CONSTANT_Fieldref_info field}.
aoqi@0 41 */
aoqi@0 42 public final class ReferenceFinder {
aoqi@0 43 /**
aoqi@0 44 * Filter for ReferenceFinder of what constant pool entries for reference lookup.
aoqi@0 45 */
aoqi@0 46 public interface Filter {
aoqi@0 47 /**
aoqi@0 48 * Decides if the given CPRefInfo entry should be accepted or filtered.
aoqi@0 49 *
aoqi@0 50 * @param cpool ConstantPool of the ClassFile being parsed
aoqi@0 51 * @param cpref constant pool entry representing a reference to
aoqi@0 52 * a fields method, and interface method.
aoqi@0 53 * @return {@code true} if accepted; otherwise {@code false}
aoqi@0 54 */
aoqi@0 55 boolean accept(ConstantPool cpool, CPRefInfo cpref);
aoqi@0 56 }
aoqi@0 57
aoqi@0 58 /**
aoqi@0 59 * Visitor of individual method of a ClassFile that references the
aoqi@0 60 * accepted field, method, or interface method references.
aoqi@0 61 */
aoqi@0 62 public interface Visitor {
aoqi@0 63 /**
aoqi@0 64 * Invoked for a method containing one or more accepted CPRefInfo entries
aoqi@0 65 *
aoqi@0 66 * @param cf ClassFile
aoqi@0 67 * @param method Method that does the references the accepted references
aoqi@0 68 * @param refs Accepted constant pool method/field reference
aoqi@0 69 */
aoqi@0 70 void visit(ClassFile cf, Method method, List<CPRefInfo> refConstantPool);
aoqi@0 71 }
aoqi@0 72
aoqi@0 73 private final Filter filter;
aoqi@0 74 private final Visitor visitor;
aoqi@0 75
aoqi@0 76 /**
aoqi@0 77 * Constructor.
aoqi@0 78 */
aoqi@0 79 public ReferenceFinder(Filter filter, Visitor visitor) {
aoqi@0 80 this.filter = Objects.requireNonNull(filter);
aoqi@0 81 this.visitor = Objects.requireNonNull(visitor);
aoqi@0 82 }
aoqi@0 83
aoqi@0 84 /**
aoqi@0 85 * Parses a given ClassFile and invoke the visitor if there is any reference
aoqi@0 86 * to the constant pool entries referencing field, method, or
aoqi@0 87 * interface method that are accepted. This method will return
aoqi@0 88 * {@code true} if there is one or more accepted constant pool entries
aoqi@0 89 * to lookup; otherwise, it will return {@code false}.
aoqi@0 90 *
aoqi@0 91 * @param cf ClassFile
aoqi@0 92 * @return {@code true} if the given class file is processed to lookup
aoqi@0 93 * references
aoqi@0 94 * @throws ConstantPoolException if an error of the constant pool
aoqi@0 95 */
aoqi@0 96 public boolean parse(ClassFile cf) throws ConstantPoolException {
aoqi@0 97 List<Integer> cprefs = new ArrayList<Integer>();
aoqi@0 98 int index = 1;
aoqi@0 99 for (ConstantPool.CPInfo cpInfo : cf.constant_pool.entries()) {
aoqi@0 100 if (cpInfo.accept(cpVisitor, cf.constant_pool)) {
aoqi@0 101 cprefs.add(index);
aoqi@0 102 }
aoqi@0 103 index += cpInfo.size();
aoqi@0 104 }
aoqi@0 105
aoqi@0 106 if (cprefs.isEmpty()) {
aoqi@0 107 return false;
aoqi@0 108 }
aoqi@0 109
aoqi@0 110 for (Method m : cf.methods) {
aoqi@0 111 Set<Integer> ids = new HashSet<Integer>();
aoqi@0 112 Code_attribute c_attr = (Code_attribute) m.attributes.get(Attribute.Code);
aoqi@0 113 if (c_attr != null) {
aoqi@0 114 for (Instruction instr : c_attr.getInstructions()) {
aoqi@0 115 int idx = instr.accept(codeVisitor, cprefs);
aoqi@0 116 if (idx > 0) {
aoqi@0 117 ids.add(idx);
aoqi@0 118 }
aoqi@0 119 }
aoqi@0 120 }
aoqi@0 121 if (ids.size() > 0) {
aoqi@0 122 List<CPRefInfo> refInfos = new ArrayList<CPRefInfo>(ids.size());
aoqi@0 123 for (int id : ids) {
aoqi@0 124 refInfos.add(CPRefInfo.class.cast(cf.constant_pool.get(id)));
aoqi@0 125 }
aoqi@0 126 visitor.visit(cf, m, refInfos);
aoqi@0 127 }
aoqi@0 128 }
aoqi@0 129 return true;
aoqi@0 130 }
aoqi@0 131
aoqi@0 132 private ConstantPool.Visitor<Boolean,ConstantPool> cpVisitor =
aoqi@0 133 new ConstantPool.Visitor<Boolean,ConstantPool>()
aoqi@0 134 {
aoqi@0 135 public Boolean visitClass(CONSTANT_Class_info info, ConstantPool cpool) {
aoqi@0 136 return false;
aoqi@0 137 }
aoqi@0 138
aoqi@0 139 public Boolean visitInterfaceMethodref(CONSTANT_InterfaceMethodref_info info, ConstantPool cpool) {
aoqi@0 140 return filter.accept(cpool, info);
aoqi@0 141 }
aoqi@0 142
aoqi@0 143 public Boolean visitMethodref(CONSTANT_Methodref_info info, ConstantPool cpool) {
aoqi@0 144 return filter.accept(cpool, info);
aoqi@0 145 }
aoqi@0 146
aoqi@0 147 public Boolean visitFieldref(CONSTANT_Fieldref_info info, ConstantPool cpool) {
aoqi@0 148 return filter.accept(cpool, info);
aoqi@0 149 }
aoqi@0 150
aoqi@0 151 public Boolean visitDouble(CONSTANT_Double_info info, ConstantPool cpool) {
aoqi@0 152 return false;
aoqi@0 153 }
aoqi@0 154
aoqi@0 155 public Boolean visitFloat(CONSTANT_Float_info info, ConstantPool cpool) {
aoqi@0 156 return false;
aoqi@0 157 }
aoqi@0 158
aoqi@0 159 public Boolean visitInteger(CONSTANT_Integer_info info, ConstantPool cpool) {
aoqi@0 160 return false;
aoqi@0 161 }
aoqi@0 162
aoqi@0 163 public Boolean visitInvokeDynamic(CONSTANT_InvokeDynamic_info info, ConstantPool cpool) {
aoqi@0 164 return false;
aoqi@0 165 }
aoqi@0 166
aoqi@0 167 public Boolean visitLong(CONSTANT_Long_info info, ConstantPool cpool) {
aoqi@0 168 return false;
aoqi@0 169 }
aoqi@0 170
aoqi@0 171 public Boolean visitNameAndType(CONSTANT_NameAndType_info info, ConstantPool cpool) {
aoqi@0 172 return false;
aoqi@0 173 }
aoqi@0 174
aoqi@0 175 public Boolean visitMethodHandle(CONSTANT_MethodHandle_info info, ConstantPool cpool) {
aoqi@0 176 return false;
aoqi@0 177 }
aoqi@0 178
aoqi@0 179 public Boolean visitMethodType(CONSTANT_MethodType_info info, ConstantPool cpool) {
aoqi@0 180 return false;
aoqi@0 181 }
aoqi@0 182
aoqi@0 183 public Boolean visitString(CONSTANT_String_info info, ConstantPool cpool) {
aoqi@0 184 return false;
aoqi@0 185 }
aoqi@0 186
aoqi@0 187 public Boolean visitUtf8(CONSTANT_Utf8_info info, ConstantPool cpool) {
aoqi@0 188 return false;
aoqi@0 189 }
aoqi@0 190 };
aoqi@0 191
aoqi@0 192 private Instruction.KindVisitor<Integer, List<Integer>> codeVisitor =
aoqi@0 193 new Instruction.KindVisitor<Integer, List<Integer>>()
aoqi@0 194 {
aoqi@0 195 public Integer visitNoOperands(Instruction instr, List<Integer> p) {
aoqi@0 196 return 0;
aoqi@0 197 }
aoqi@0 198
aoqi@0 199 public Integer visitArrayType(Instruction instr, TypeKind kind, List<Integer> p) {
aoqi@0 200 return 0;
aoqi@0 201 }
aoqi@0 202
aoqi@0 203 public Integer visitBranch(Instruction instr, int offset, List<Integer> p) {
aoqi@0 204 return 0;
aoqi@0 205 }
aoqi@0 206
aoqi@0 207 public Integer visitConstantPoolRef(Instruction instr, int index, List<Integer> p) {
aoqi@0 208 return p.contains(index) ? index : 0;
aoqi@0 209 }
aoqi@0 210
aoqi@0 211 public Integer visitConstantPoolRefAndValue(Instruction instr, int index, int value, List<Integer> p) {
aoqi@0 212 return p.contains(index) ? index : 0;
aoqi@0 213 }
aoqi@0 214
aoqi@0 215 public Integer visitLocal(Instruction instr, int index, List<Integer> p) {
aoqi@0 216 return 0;
aoqi@0 217 }
aoqi@0 218
aoqi@0 219 public Integer visitLocalAndValue(Instruction instr, int index, int value, List<Integer> p) {
aoqi@0 220 return 0;
aoqi@0 221 }
aoqi@0 222
aoqi@0 223 public Integer visitLookupSwitch(Instruction instr, int default_, int npairs, int[] matches, int[] offsets, List<Integer> p) {
aoqi@0 224 return 0;
aoqi@0 225 }
aoqi@0 226
aoqi@0 227 public Integer visitTableSwitch(Instruction instr, int default_, int low, int high, int[] offsets, List<Integer> p) {
aoqi@0 228 return 0;
aoqi@0 229 }
aoqi@0 230
aoqi@0 231 public Integer visitValue(Instruction instr, int value, List<Integer> p) {
aoqi@0 232 return 0;
aoqi@0 233 }
aoqi@0 234
aoqi@0 235 public Integer visitUnknown(Instruction instr, List<Integer> p) {
aoqi@0 236 return 0;
aoqi@0 237 }
aoqi@0 238 };
aoqi@0 239 }
aoqi@0 240

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