jdk8-mips64-public/langtools: comparison src/share/classes/com/sun/tools/classfile/ReferenceFinder.java

--1:000000000000
+:959103a6100f
+/*
+* Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
+* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+*
+* This code is free software; you can redistribute it and/or modify it
+* under the terms of the GNU General Public License version 2 only, as
+* published by the Free Software Foundation.  Oracle designates this
+* particular file as subject to the "Classpath" exception as provided
+* by Oracle in the LICENSE file that accompanied this code.
+*
+* This code is distributed in the hope that it will be useful, but WITHOUT
+* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+* version 2 for more details (a copy is included in the LICENSE file that
+* accompanied this code).
+*
+* You should have received a copy of the GNU General Public License version
+* 2 along with this work; if not, write to the Free Software Foundation,
+* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+*
+* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+* or visit www.oracle.com if you need additional information or have any
+* questions.
+*/
+package com.sun.tools.classfile;
+import java.util.ArrayList;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Objects;
+import java.util.Set;
+import com.sun.tools.classfile.Instruction.TypeKind;
+import static com.sun.tools.classfile.ConstantPool.*;
+/**
+* A utility class to find where in a ClassFile references
+* a {@link CONSTANT_Methodref_info method},
+* a {@link CONSTANT_InterfaceMethodref_info interface method,
+* or a {@link CONSTANT_Fieldref_info field}.
+*/
+public final class ReferenceFinder {
+/**
+* Filter for ReferenceFinder of what constant pool entries for reference lookup.
+*/
+public interface Filter {
+/**
+* Decides if the given CPRefInfo entry should be accepted or filtered.
+*
+* @param cpool  ConstantPool of the ClassFile being parsed
+* @param cpref  constant pool entry representing a reference to
+*               a fields method, and interface method.
+* @return {@code true} if accepted; otherwise {@code false}
+*/
+boolean accept(ConstantPool cpool, CPRefInfo cpref);
+}
+/**
+* Visitor of individual method of a ClassFile that references the
+* accepted field, method, or interface method references.
+*/
+public interface Visitor {
+/**
+* Invoked for a method containing one or more accepted CPRefInfo entries
+*
+* @param cf      ClassFile
+* @param method  Method that does the references the accepted references
+* @param refs    Accepted constant pool method/field reference
+*/
+void visit(ClassFile cf, Method method, List<CPRefInfo> refConstantPool);
+}
+private final Filter filter;
+private final Visitor visitor;
+/**
+* Constructor.
+*/
+public ReferenceFinder(Filter filter, Visitor visitor) {
+this.filter = Objects.requireNonNull(filter);
+this.visitor = Objects.requireNonNull(visitor);
+}
+/**
+* Parses a given ClassFile and invoke the visitor if there is any reference
+* to the constant pool entries referencing field, method, or
+* interface method that are accepted. This method will return
+* {@code true} if there is one or more accepted constant pool entries
+* to lookup; otherwise, it will return {@code false}.
+*
+* @param  cf  ClassFile
+* @return {@code true} if the given class file is processed to lookup
+*         references
+* @throws ConstantPoolException if an error of the constant pool
+*/
+public boolean parse(ClassFile cf) throws ConstantPoolException {
+List<Integer> cprefs = new ArrayList<Integer>();
+int index = 1;
+for (ConstantPool.CPInfo cpInfo : cf.constant_pool.entries()) {
+if (cpInfo.accept(cpVisitor, cf.constant_pool)) {
+cprefs.add(index);
+}
+index += cpInfo.size();
+}
+if (cprefs.isEmpty()) {
+return false;
+}
+for (Method m : cf.methods) {
+Set<Integer> ids = new HashSet<Integer>();
+Code_attribute c_attr = (Code_attribute) m.attributes.get(Attribute.Code);
+if (c_attr != null) {
+for (Instruction instr : c_attr.getInstructions()) {
+int idx = instr.accept(codeVisitor, cprefs);
+if (idx > 0) {
+ids.add(idx);
+}
+}
+}
+if (ids.size() > 0) {
+List<CPRefInfo> refInfos = new ArrayList<CPRefInfo>(ids.size());
+for (int id : ids) {
+refInfos.add(CPRefInfo.class.cast(cf.constant_pool.get(id)));
+}
+visitor.visit(cf, m, refInfos);
+}
+}
+return true;
+}
+private ConstantPool.Visitor<Boolean,ConstantPool> cpVisitor =
+new ConstantPool.Visitor<Boolean,ConstantPool>()
+{
+public Boolean visitClass(CONSTANT_Class_info info, ConstantPool cpool) {
+return false;
+}
+public Boolean visitInterfaceMethodref(CONSTANT_InterfaceMethodref_info info, ConstantPool cpool) {
+return filter.accept(cpool, info);
+}
+public Boolean visitMethodref(CONSTANT_Methodref_info info, ConstantPool cpool) {
+return filter.accept(cpool, info);
+}
+public Boolean visitFieldref(CONSTANT_Fieldref_info info, ConstantPool cpool) {
+return filter.accept(cpool, info);
+}
+public Boolean visitDouble(CONSTANT_Double_info info, ConstantPool cpool) {
+return false;
+}
+public Boolean visitFloat(CONSTANT_Float_info info, ConstantPool cpool) {
+return false;
+}
+public Boolean visitInteger(CONSTANT_Integer_info info, ConstantPool cpool) {
+return false;
+}
+public Boolean visitInvokeDynamic(CONSTANT_InvokeDynamic_info info, ConstantPool cpool) {
+return false;
+}
+public Boolean visitLong(CONSTANT_Long_info info, ConstantPool cpool) {
+return false;
+}
+public Boolean visitNameAndType(CONSTANT_NameAndType_info info, ConstantPool cpool) {
+return false;
+}
+public Boolean visitMethodHandle(CONSTANT_MethodHandle_info info, ConstantPool cpool) {
+return false;
+}
+public Boolean visitMethodType(CONSTANT_MethodType_info info, ConstantPool cpool) {
+return false;
+}
+public Boolean visitString(CONSTANT_String_info info, ConstantPool cpool) {
+return false;
+}
+public Boolean visitUtf8(CONSTANT_Utf8_info info, ConstantPool cpool) {
+return false;
+}
+};
+private Instruction.KindVisitor<Integer, List<Integer>> codeVisitor =
+new Instruction.KindVisitor<Integer, List<Integer>>()
+{
+public Integer visitNoOperands(Instruction instr, List<Integer> p) {
+return 0;
+}
+public Integer visitArrayType(Instruction instr, TypeKind kind, List<Integer> p) {
+return 0;
+}
+public Integer visitBranch(Instruction instr, int offset, List<Integer> p) {
+return 0;
+}
+public Integer visitConstantPoolRef(Instruction instr, int index, List<Integer> p) {
+return p.contains(index) ? index : 0;
+}
+public Integer visitConstantPoolRefAndValue(Instruction instr, int index, int value, List<Integer> p) {
+return p.contains(index) ? index : 0;
+}
+public Integer visitLocal(Instruction instr, int index, List<Integer> p) {
+return 0;
+}
+public Integer visitLocalAndValue(Instruction instr, int index, int value, List<Integer> p) {
+return 0;
+}
+public Integer visitLookupSwitch(Instruction instr, int default_, int npairs, int[] matches, int[] offsets, List<Integer> p) {
+return 0;
+}
+public Integer visitTableSwitch(Instruction instr, int default_, int low, int high, int[] offsets, List<Integer> p) {
+return 0;
+}
+public Integer visitValue(Instruction instr, int value, List<Integer> p) {
+return 0;
+}
+public Integer visitUnknown(Instruction instr, List<Integer> p) {
+return 0;
+}
+};
+}

Mercurial > jdk8-mips64-public > langtools / file comparison

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

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