aoqi@0: /*
aoqi@0: * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0: *
aoqi@0: * This code is free software; you can redistribute it and/or modify it
aoqi@0: * under the terms of the GNU General Public License version 2 only, as
aoqi@0: * published by the Free Software Foundation. Oracle designates this
aoqi@0: * particular file as subject to the "Classpath" exception as provided
aoqi@0: * by Oracle in the LICENSE file that accompanied this code.
aoqi@0: *
aoqi@0: * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0: * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0: * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0: * accompanied this code).
aoqi@0: *
aoqi@0: * You should have received a copy of the GNU General Public License version
aoqi@0: * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0: * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0: *
aoqi@0: * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0: * or visit www.oracle.com if you need additional information or have any
aoqi@0: * questions.
aoqi@0: */
aoqi@0:
aoqi@0: package com.sun.tools.javac.jvm;
aoqi@0:
aoqi@0: import com.sun.tools.javac.code.Kinds;
aoqi@0: import com.sun.tools.javac.code.Symbol;
aoqi@0: import com.sun.tools.javac.code.Symbol.*;
aoqi@0: import com.sun.tools.javac.code.Type;
aoqi@0: import com.sun.tools.javac.code.Types;
aoqi@0: import com.sun.tools.javac.code.Types.UniqueType;
aoqi@0:
aoqi@0: import com.sun.tools.javac.util.ArrayUtils;
aoqi@0: import com.sun.tools.javac.util.Assert;
aoqi@0: import com.sun.tools.javac.util.Filter;
aoqi@0: import com.sun.tools.javac.util.Name;
aoqi@0:
aoqi@0: import java.util.*;
aoqi@0:
aoqi@0: /** An internal structure that corresponds to the constant pool of a classfile.
aoqi@0: *
aoqi@0: *
This is NOT part of any supported API.
aoqi@0: * If you write code that depends on this, you do so at your own risk.
aoqi@0: * This code and its internal interfaces are subject to change or
aoqi@0: * deletion without notice.
aoqi@0: */
aoqi@0: public class Pool {
aoqi@0:
aoqi@0: public static final int MAX_ENTRIES = 0xFFFF;
aoqi@0: public static final int MAX_STRING_LENGTH = 0xFFFF;
aoqi@0:
aoqi@0: /** Index of next constant to be entered.
aoqi@0: */
aoqi@0: int pp;
aoqi@0:
aoqi@0: /** The initial pool buffer.
aoqi@0: */
aoqi@0: Object[] pool;
aoqi@0:
aoqi@0: /** A hashtable containing all constants in the pool.
aoqi@0: */
aoqi@0: Map indices;
aoqi@0:
aoqi@0: Types types;
aoqi@0:
aoqi@0: /** Construct a pool with given number of elements and element array.
aoqi@0: */
aoqi@0: public Pool(int pp, Object[] pool, Types types) {
aoqi@0: this.pp = pp;
aoqi@0: this.pool = pool;
aoqi@0: this.types = types;
aoqi@0: this.indices = new HashMap(pool.length);
aoqi@0: for (int i = 1; i < pp; i++) {
aoqi@0: if (pool[i] != null) indices.put(pool[i], i);
aoqi@0: }
aoqi@0: }
aoqi@0:
aoqi@0: /** Construct an empty pool.
aoqi@0: */
aoqi@0: public Pool(Types types) {
aoqi@0: this(1, new Object[64], types);
aoqi@0: }
aoqi@0:
aoqi@0: /** Return the number of entries in the constant pool.
aoqi@0: */
aoqi@0: public int numEntries() {
aoqi@0: return pp;
aoqi@0: }
aoqi@0:
aoqi@0: /** Remove everything from this pool.
aoqi@0: */
aoqi@0: public void reset() {
aoqi@0: pp = 1;
aoqi@0: indices.clear();
aoqi@0: }
aoqi@0:
aoqi@0: /** Place an object in the pool, unless it is already there.
aoqi@0: * If object is a symbol also enter its owner unless the owner is a
aoqi@0: * package. Return the object's index in the pool.
aoqi@0: */
aoqi@0: public int put(Object value) {
aoqi@0: value = makePoolValue(value);
aoqi@0: // assert !(value instanceof Type.TypeVar);
aoqi@0: Integer index = indices.get(value);
aoqi@0: if (index == null) {
aoqi@0: // System.err.println("put " + value + " " + value.getClass());//DEBUG
aoqi@0: index = pp;
aoqi@0: indices.put(value, index);
aoqi@0: pool = ArrayUtils.ensureCapacity(pool, pp);
aoqi@0: pool[pp++] = value;
aoqi@0: if (value instanceof Long || value instanceof Double) {
aoqi@0: pool = ArrayUtils.ensureCapacity(pool, pp);
aoqi@0: pool[pp++] = null;
aoqi@0: }
aoqi@0: }
aoqi@0: return index.intValue();
aoqi@0: }
aoqi@0:
aoqi@0: Object makePoolValue(Object o) {
aoqi@0: if (o instanceof DynamicMethodSymbol) {
aoqi@0: return new DynamicMethod((DynamicMethodSymbol)o, types);
aoqi@0: } else if (o instanceof MethodSymbol) {
aoqi@0: return new Method((MethodSymbol)o, types);
aoqi@0: } else if (o instanceof VarSymbol) {
aoqi@0: return new Variable((VarSymbol)o, types);
aoqi@0: } else if (o instanceof Type) {
aoqi@0: return new UniqueType((Type)o, types);
aoqi@0: } else {
aoqi@0: return o;
aoqi@0: }
aoqi@0: }
aoqi@0:
aoqi@0: /** Return the given object's index in the pool,
aoqi@0: * or -1 if object is not in there.
aoqi@0: */
aoqi@0: public int get(Object o) {
aoqi@0: Integer n = indices.get(o);
aoqi@0: return n == null ? -1 : n.intValue();
aoqi@0: }
aoqi@0:
aoqi@0: static class Method extends DelegatedSymbol {
aoqi@0: UniqueType uniqueType;
aoqi@0: Method(MethodSymbol m, Types types) {
aoqi@0: super(m);
aoqi@0: this.uniqueType = new UniqueType(m.type, types);
aoqi@0: }
aoqi@0: public boolean equals(Object any) {
aoqi@0: if (!(any instanceof Method)) return false;
aoqi@0: MethodSymbol o = ((Method)any).other;
aoqi@0: MethodSymbol m = this.other;
aoqi@0: return
aoqi@0: o.name == m.name &&
aoqi@0: o.owner == m.owner &&
aoqi@0: ((Method)any).uniqueType.equals(uniqueType);
aoqi@0: }
aoqi@0: public int hashCode() {
aoqi@0: MethodSymbol m = this.other;
aoqi@0: return
aoqi@0: m.name.hashCode() * 33 +
aoqi@0: m.owner.hashCode() * 9 +
aoqi@0: uniqueType.hashCode();
aoqi@0: }
aoqi@0: }
aoqi@0:
aoqi@0: static class DynamicMethod extends Method {
aoqi@0: public Object[] uniqueStaticArgs;
aoqi@0:
aoqi@0: DynamicMethod(DynamicMethodSymbol m, Types types) {
aoqi@0: super(m, types);
aoqi@0: uniqueStaticArgs = getUniqueTypeArray(m.staticArgs, types);
aoqi@0: }
aoqi@0:
aoqi@0: @Override
aoqi@0: public boolean equals(Object any) {
aoqi@0: if (!super.equals(any)) return false;
aoqi@0: if (!(any instanceof DynamicMethod)) return false;
aoqi@0: DynamicMethodSymbol dm1 = (DynamicMethodSymbol)other;
aoqi@0: DynamicMethodSymbol dm2 = (DynamicMethodSymbol)((DynamicMethod)any).other;
aoqi@0: return dm1.bsm == dm2.bsm &&
aoqi@0: dm1.bsmKind == dm2.bsmKind &&
aoqi@0: Arrays.equals(uniqueStaticArgs,
aoqi@0: ((DynamicMethod)any).uniqueStaticArgs);
aoqi@0: }
aoqi@0:
aoqi@0: @Override
aoqi@0: public int hashCode() {
aoqi@0: int hash = super.hashCode();
aoqi@0: DynamicMethodSymbol dm = (DynamicMethodSymbol)other;
aoqi@0: hash += dm.bsmKind * 7 +
aoqi@0: dm.bsm.hashCode() * 11;
aoqi@0: for (int i = 0; i < dm.staticArgs.length; i++) {
aoqi@0: hash += (uniqueStaticArgs[i].hashCode() * 23);
aoqi@0: }
aoqi@0: return hash;
aoqi@0: }
aoqi@0:
aoqi@0: private Object[] getUniqueTypeArray(Object[] objects, Types types) {
aoqi@0: Object[] result = new Object[objects.length];
aoqi@0: for (int i = 0; i < objects.length; i++) {
aoqi@0: if (objects[i] instanceof Type) {
aoqi@0: result[i] = new UniqueType((Type)objects[i], types);
aoqi@0: } else {
aoqi@0: result[i] = objects[i];
aoqi@0: }
aoqi@0: }
aoqi@0: return result;
aoqi@0: }
aoqi@0: }
aoqi@0:
aoqi@0: static class Variable extends DelegatedSymbol {
aoqi@0: UniqueType uniqueType;
aoqi@0: Variable(VarSymbol v, Types types) {
aoqi@0: super(v);
aoqi@0: this.uniqueType = new UniqueType(v.type, types);
aoqi@0: }
aoqi@0: public boolean equals(Object any) {
aoqi@0: if (!(any instanceof Variable)) return false;
aoqi@0: VarSymbol o = ((Variable)any).other;
aoqi@0: VarSymbol v = other;
aoqi@0: return
aoqi@0: o.name == v.name &&
aoqi@0: o.owner == v.owner &&
aoqi@0: ((Variable)any).uniqueType.equals(uniqueType);
aoqi@0: }
aoqi@0: public int hashCode() {
aoqi@0: VarSymbol v = other;
aoqi@0: return
aoqi@0: v.name.hashCode() * 33 +
aoqi@0: v.owner.hashCode() * 9 +
aoqi@0: uniqueType.hashCode();
aoqi@0: }
aoqi@0: }
aoqi@0:
aoqi@0: public static class MethodHandle {
aoqi@0:
aoqi@0: /** Reference kind - see ClassFile */
aoqi@0: int refKind;
aoqi@0:
aoqi@0: /** Reference symbol */
aoqi@0: Symbol refSym;
aoqi@0:
aoqi@0: UniqueType uniqueType;
aoqi@0:
aoqi@0: public MethodHandle(int refKind, Symbol refSym, Types types) {
aoqi@0: this.refKind = refKind;
aoqi@0: this.refSym = refSym;
aoqi@0: this.uniqueType = new UniqueType(this.refSym.type, types);
aoqi@0: checkConsistent();
aoqi@0: }
aoqi@0: public boolean equals(Object other) {
aoqi@0: if (!(other instanceof MethodHandle)) return false;
aoqi@0: MethodHandle mr = (MethodHandle) other;
aoqi@0: if (mr.refKind != refKind) return false;
aoqi@0: Symbol o = mr.refSym;
aoqi@0: return
aoqi@0: o.name == refSym.name &&
aoqi@0: o.owner == refSym.owner &&
aoqi@0: ((MethodHandle)other).uniqueType.equals(uniqueType);
aoqi@0: }
aoqi@0: public int hashCode() {
aoqi@0: return
aoqi@0: refKind * 65 +
aoqi@0: refSym.name.hashCode() * 33 +
aoqi@0: refSym.owner.hashCode() * 9 +
aoqi@0: uniqueType.hashCode();
aoqi@0: }
aoqi@0:
aoqi@0: /**
aoqi@0: * Check consistency of reference kind and symbol (see JVMS 4.4.8)
aoqi@0: */
aoqi@0: @SuppressWarnings("fallthrough")
aoqi@0: private void checkConsistent() {
aoqi@0: boolean staticOk = false;
aoqi@0: int expectedKind = -1;
aoqi@0: Filter nameFilter = nonInitFilter;
aoqi@0: boolean interfaceOwner = false;
aoqi@0: switch (refKind) {
aoqi@0: case ClassFile.REF_getStatic:
aoqi@0: case ClassFile.REF_putStatic:
aoqi@0: staticOk = true;
aoqi@0: case ClassFile.REF_getField:
aoqi@0: case ClassFile.REF_putField:
aoqi@0: expectedKind = Kinds.VAR;
aoqi@0: break;
aoqi@0: case ClassFile.REF_newInvokeSpecial:
aoqi@0: nameFilter = initFilter;
aoqi@0: expectedKind = Kinds.MTH;
aoqi@0: break;
aoqi@0: case ClassFile.REF_invokeInterface:
aoqi@0: interfaceOwner = true;
aoqi@0: expectedKind = Kinds.MTH;
aoqi@0: break;
aoqi@0: case ClassFile.REF_invokeStatic:
aoqi@0: interfaceOwner = true;
aoqi@0: staticOk = true;
aoqi@0: case ClassFile.REF_invokeVirtual:
aoqi@0: expectedKind = Kinds.MTH;
aoqi@0: break;
aoqi@0: case ClassFile.REF_invokeSpecial:
aoqi@0: interfaceOwner = true;
aoqi@0: expectedKind = Kinds.MTH;
aoqi@0: break;
aoqi@0: }
aoqi@0: Assert.check(!refSym.isStatic() || staticOk);
aoqi@0: Assert.check(refSym.kind == expectedKind);
aoqi@0: Assert.check(nameFilter.accepts(refSym.name));
aoqi@0: Assert.check(!refSym.owner.isInterface() || interfaceOwner);
aoqi@0: }
aoqi@0: //where
aoqi@0: Filter nonInitFilter = new Filter() {
aoqi@0: public boolean accepts(Name n) {
aoqi@0: return n != n.table.names.init && n != n.table.names.clinit;
aoqi@0: }
aoqi@0: };
aoqi@0:
aoqi@0: Filter initFilter = new Filter() {
aoqi@0: public boolean accepts(Name n) {
aoqi@0: return n == n.table.names.init;
aoqi@0: }
aoqi@0: };
aoqi@0: }
aoqi@0: }