38f31bbade
Implemented C2 instrinsic for StringCode.hasNegatives() on SPARC. Reviewed-by: kvn, jrose, thartmann
671 lines
25 KiB
Java
671 lines
25 KiB
Java
/*
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* Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.lang;
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import java.io.UnsupportedEncodingException;
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import java.lang.ref.SoftReference;
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import java.nio.ByteBuffer;
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import java.nio.CharBuffer;
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import java.nio.charset.Charset;
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import java.nio.charset.CharsetDecoder;
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import java.nio.charset.CharsetEncoder;
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import java.nio.charset.CharacterCodingException;
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import java.nio.charset.CoderResult;
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import java.nio.charset.CodingErrorAction;
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import java.nio.charset.IllegalCharsetNameException;
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import java.nio.charset.UnsupportedCharsetException;
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import java.util.Arrays;
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import jdk.internal.HotSpotIntrinsicCandidate;
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import sun.nio.cs.HistoricallyNamedCharset;
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import sun.nio.cs.ArrayDecoder;
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import sun.nio.cs.ArrayEncoder;
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import static java.lang.String.LATIN1;
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import static java.lang.String.UTF16;
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import static java.lang.String.COMPACT_STRINGS;
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import static java.nio.charset.StandardCharsets.ISO_8859_1;
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import static java.nio.charset.StandardCharsets.US_ASCII;
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import static java.nio.charset.StandardCharsets.UTF_8;
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/**
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* Utility class for string encoding and decoding.
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*/
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class StringCoding {
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private StringCoding() { }
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/** The cached coders for each thread */
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private static final ThreadLocal<SoftReference<StringDecoder>> decoder =
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new ThreadLocal<>();
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private static final ThreadLocal<SoftReference<StringEncoder>> encoder =
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new ThreadLocal<>();
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private static boolean warnUnsupportedCharset = true;
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private static <T> T deref(ThreadLocal<SoftReference<T>> tl) {
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SoftReference<T> sr = tl.get();
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if (sr == null)
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return null;
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return sr.get();
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}
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private static <T> void set(ThreadLocal<SoftReference<T>> tl, T ob) {
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tl.set(new SoftReference<>(ob));
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}
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// Trim the given byte array to the given length
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//
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private static byte[] safeTrim(byte[] ba, int len, boolean isTrusted) {
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if (len == ba.length && (isTrusted || System.getSecurityManager() == null))
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return ba;
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else
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return Arrays.copyOf(ba, len);
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}
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private static int scale(int len, float expansionFactor) {
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// We need to perform double, not float, arithmetic; otherwise
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// we lose low order bits when len is larger than 2**24.
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return (int)(len * (double)expansionFactor);
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}
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private static Charset lookupCharset(String csn) {
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if (Charset.isSupported(csn)) {
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try {
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return Charset.forName(csn);
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} catch (UnsupportedCharsetException x) {
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throw new Error(x);
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}
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}
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return null;
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}
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private static void warnUnsupportedCharset(String csn) {
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if (warnUnsupportedCharset) {
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// Use err(String) rather than the Logging API or System.err
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// since this method may be called during VM initialization
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// before either is available.
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err("WARNING: Default charset " + csn +
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" not supported, using ISO-8859-1 instead\n");
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warnUnsupportedCharset = false;
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}
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}
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static class Result {
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byte[] value;
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byte coder;
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Result with() {
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coder = COMPACT_STRINGS ? LATIN1 : UTF16;
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value = new byte[0];
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return this;
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}
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Result with(char[] val, int off, int len) {
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if (String.COMPACT_STRINGS) {
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byte[] bs = StringUTF16.compress(val, off, len);
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if (bs != null) {
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value = bs;
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coder = LATIN1;
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return this;
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}
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}
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coder = UTF16;
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value = StringUTF16.toBytes(val, off, len);
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return this;
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}
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Result with(byte[] val, byte coder) {
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this.coder = coder;
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value = val;
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return this;
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}
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}
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@HotSpotIntrinsicCandidate
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public static boolean hasNegatives(byte[] ba, int off, int len) {
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for (int i = off; i < off + len; i++) {
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if (ba[i] < 0) {
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return true;
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}
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}
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return false;
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}
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// -- Decoding --
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static class StringDecoder {
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private final String requestedCharsetName;
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private final Charset cs;
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private final boolean isASCIICompatible;
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private final CharsetDecoder cd;
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protected final Result result;
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StringDecoder(Charset cs, String rcn) {
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this.requestedCharsetName = rcn;
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this.cs = cs;
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this.cd = cs.newDecoder()
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.onMalformedInput(CodingErrorAction.REPLACE)
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.onUnmappableCharacter(CodingErrorAction.REPLACE);
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this.result = new Result();
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this.isASCIICompatible = (cd instanceof ArrayDecoder) &&
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((ArrayDecoder)cd).isASCIICompatible();
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}
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String charsetName() {
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if (cs instanceof HistoricallyNamedCharset)
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return ((HistoricallyNamedCharset)cs).historicalName();
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return cs.name();
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}
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final String requestedCharsetName() {
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return requestedCharsetName;
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}
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Result decode(byte[] ba, int off, int len) {
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if (len == 0) {
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return result.with();
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}
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// fastpath for ascii compatible
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if (isASCIICompatible && !hasNegatives(ba, off, len)) {
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if (COMPACT_STRINGS) {
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return result.with(Arrays.copyOfRange(ba, off, off + len),
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LATIN1);
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} else {
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return result.with(StringLatin1.inflate(ba, off, len), UTF16);
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}
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}
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int en = scale(len, cd.maxCharsPerByte());
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char[] ca = new char[en];
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if (cd instanceof ArrayDecoder) {
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int clen = ((ArrayDecoder)cd).decode(ba, off, len, ca);
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return result.with(ca, 0, clen);
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}
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cd.reset();
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ByteBuffer bb = ByteBuffer.wrap(ba, off, len);
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CharBuffer cb = CharBuffer.wrap(ca);
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try {
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CoderResult cr = cd.decode(bb, cb, true);
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if (!cr.isUnderflow())
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cr.throwException();
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cr = cd.flush(cb);
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if (!cr.isUnderflow())
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cr.throwException();
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} catch (CharacterCodingException x) {
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// Substitution is always enabled,
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// so this shouldn't happen
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throw new Error(x);
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}
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return result.with(ca, 0, cb.position());
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}
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}
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private static class StringDecoder8859_1 extends StringDecoder {
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StringDecoder8859_1(Charset cs, String rcn) {
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super(cs, rcn);
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}
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Result decode(byte[] ba, int off, int len) {
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if (COMPACT_STRINGS) {
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return result.with(Arrays.copyOfRange(ba, off, off + len), LATIN1);
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} else {
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return result.with(StringLatin1.inflate(ba, off, len), UTF16);
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}
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}
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}
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static Result decode(String charsetName, byte[] ba, int off, int len)
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throws UnsupportedEncodingException
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{
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StringDecoder sd = deref(decoder);
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String csn = (charsetName == null) ? "ISO-8859-1" : charsetName;
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if ((sd == null) || !(csn.equals(sd.requestedCharsetName())
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|| csn.equals(sd.charsetName()))) {
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sd = null;
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try {
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Charset cs = lookupCharset(csn);
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if (cs != null) {
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if (cs == UTF_8) {
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sd = new StringDecoderUTF8(cs, csn);
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} else if (cs == ISO_8859_1) {
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sd = new StringDecoder8859_1(cs, csn);
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} else {
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sd = new StringDecoder(cs, csn);
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}
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}
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} catch (IllegalCharsetNameException x) {}
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if (sd == null)
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throw new UnsupportedEncodingException(csn);
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set(decoder, sd);
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}
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return sd.decode(ba, off, len);
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}
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static Result decode(Charset cs, byte[] ba, int off, int len) {
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// (1)We never cache the "external" cs, the only benefit of creating
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// an additional StringDe/Encoder object to wrap it is to share the
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// de/encode() method. These SD/E objects are short-lived, the young-gen
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// gc should be able to take care of them well. But the best approach
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// is still not to generate them if not really necessary.
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// (2)The defensive copy of the input byte/char[] has a big performance
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// impact, as well as the outgoing result byte/char[]. Need to do the
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// optimization check of (sm==null && classLoader0==null) for both.
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// (3)getClass().getClassLoader0() is expensive
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// (4)There might be a timing gap in isTrusted setting. getClassLoader0()
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// is only checked (and then isTrusted gets set) when (SM==null). It is
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// possible that the SM==null for now but then SM is NOT null later
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// when safeTrim() is invoked...the "safe" way to do is to redundant
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// check (... && (isTrusted || SM == null || getClassLoader0())) in trim
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// but it then can be argued that the SM is null when the operation
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// is started...
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if (cs == UTF_8) {
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return StringDecoderUTF8.decode(ba, off, len, new Result());
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}
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CharsetDecoder cd = cs.newDecoder();
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// ascii fastpath
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if (cs == ISO_8859_1 || ((cd instanceof ArrayDecoder) &&
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((ArrayDecoder)cd).isASCIICompatible() &&
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!hasNegatives(ba, off, len))) {
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if (COMPACT_STRINGS) {
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return new Result().with(Arrays.copyOfRange(ba, off, off + len),
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LATIN1);
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} else {
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return new Result().with(StringLatin1.inflate(ba, off, len), UTF16);
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}
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}
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int en = scale(len, cd.maxCharsPerByte());
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if (len == 0) {
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return new Result().with();
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}
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if (System.getSecurityManager() != null &&
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cs.getClass().getClassLoader0() != null) {
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ba = Arrays.copyOfRange(ba, off, off + len);
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off = 0;
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}
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cd.onMalformedInput(CodingErrorAction.REPLACE)
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.onUnmappableCharacter(CodingErrorAction.REPLACE)
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.reset();
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char[] ca = new char[en];
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if (cd instanceof ArrayDecoder) {
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int clen = ((ArrayDecoder)cd).decode(ba, off, len, ca);
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return new Result().with(ca, 0, clen);
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}
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ByteBuffer bb = ByteBuffer.wrap(ba, off, len);
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CharBuffer cb = CharBuffer.wrap(ca);
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try {
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CoderResult cr = cd.decode(bb, cb, true);
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if (!cr.isUnderflow())
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cr.throwException();
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cr = cd.flush(cb);
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if (!cr.isUnderflow())
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cr.throwException();
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} catch (CharacterCodingException x) {
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// Substitution is always enabled,
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// so this shouldn't happen
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throw new Error(x);
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}
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return new Result().with(ca, 0, cb.position());
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}
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static Result decode(byte[] ba, int off, int len) {
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String csn = Charset.defaultCharset().name();
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try {
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// use charset name decode() variant which provides caching.
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return decode(csn, ba, off, len);
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} catch (UnsupportedEncodingException x) {
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warnUnsupportedCharset(csn);
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}
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try {
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return decode("ISO-8859-1", ba, off, len);
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} catch (UnsupportedEncodingException x) {
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// If this code is hit during VM initialization, err(String) is
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// the only way we will be able to get any kind of error message.
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err("ISO-8859-1 charset not available: " + x.toString() + "\n");
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// If we can not find ISO-8859-1 (a required encoding) then things
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// are seriously wrong with the installation.
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System.exit(1);
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return null;
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}
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}
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// -- Encoding --
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private static class StringEncoder {
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private Charset cs;
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private CharsetEncoder ce;
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private final boolean isASCIICompatible;
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private final String requestedCharsetName;
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private final boolean isTrusted;
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private StringEncoder(Charset cs, String rcn) {
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this.requestedCharsetName = rcn;
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this.cs = cs;
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this.ce = cs.newEncoder()
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.onMalformedInput(CodingErrorAction.REPLACE)
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.onUnmappableCharacter(CodingErrorAction.REPLACE);
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this.isTrusted = (cs.getClass().getClassLoader0() == null);
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this.isASCIICompatible = (ce instanceof ArrayEncoder) &&
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((ArrayEncoder)ce).isASCIICompatible();
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}
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String charsetName() {
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if (cs instanceof HistoricallyNamedCharset)
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return ((HistoricallyNamedCharset)cs).historicalName();
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return cs.name();
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}
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final String requestedCharsetName() {
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return requestedCharsetName;
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}
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byte[] encode(byte coder, byte[] val) {
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// fastpath for ascii compatible
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if (coder == LATIN1 && isASCIICompatible &&
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!hasNegatives(val, 0, val.length)) {
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return Arrays.copyOf(val, val.length);
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}
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int len = val.length >> coder; // assume LATIN1=0/UTF16=1;
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int en = scale(len, ce.maxBytesPerChar());
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byte[] ba = new byte[en];
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if (len == 0) {
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return ba;
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}
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if (ce instanceof ArrayEncoder) {
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if (!isTrusted) {
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val = Arrays.copyOf(val, val.length);
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}
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int blen = (coder == LATIN1 ) ? ((ArrayEncoder)ce).encodeFromLatin1(val, 0, len, ba)
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: ((ArrayEncoder)ce).encodeFromUTF16(val, 0, len, ba);
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if (blen != -1) {
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return safeTrim(ba, blen, isTrusted);
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}
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}
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char[] ca = (coder == LATIN1 ) ? StringLatin1.toChars(val)
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: StringUTF16.toChars(val);
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ce.reset();
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ByteBuffer bb = ByteBuffer.wrap(ba);
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CharBuffer cb = CharBuffer.wrap(ca, 0, len);
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try {
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CoderResult cr = ce.encode(cb, bb, true);
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if (!cr.isUnderflow())
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cr.throwException();
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cr = ce.flush(bb);
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if (!cr.isUnderflow())
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cr.throwException();
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} catch (CharacterCodingException x) {
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// Substitution is always enabled,
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// so this shouldn't happen
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throw new Error(x);
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}
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return safeTrim(ba, bb.position(), isTrusted);
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}
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}
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@HotSpotIntrinsicCandidate
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private static int implEncodeISOArray(byte[] sa, int sp,
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byte[] da, int dp, int len) {
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int i = 0;
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for (; i < len; i++) {
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char c = StringUTF16.getChar(sa, sp++);
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if (c > '\u00FF')
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break;
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da[dp++] = (byte)c;
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}
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return i;
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}
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static byte[] encode8859_1(byte coder, byte[] val) {
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if (coder == LATIN1) {
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return Arrays.copyOf(val, val.length);
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}
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int len = val.length >> 1;
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byte[] dst = new byte[len];
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int dp = 0;
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int sp = 0;
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int sl = len;
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while (sp < sl) {
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int ret = implEncodeISOArray(val, sp, dst, dp, len);
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sp = sp + ret;
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dp = dp + ret;
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if (ret != len) {
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char c = StringUTF16.getChar(val, sp++);
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if (Character.isHighSurrogate(c) && sp < sl &&
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Character.isLowSurrogate(StringUTF16.getChar(val, sp))) {
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sp++;
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}
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dst[dp++] = '?';
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len = sl - sp;
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}
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}
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if (dp == dst.length) {
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return dst;
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}
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return Arrays.copyOf(dst, dp);
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}
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static byte[] encodeASCII(byte coder, byte[] val) {
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if (coder == LATIN1) {
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byte[] dst = new byte[val.length];
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for (int i = 0; i < val.length; i++) {
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if (val[i] < 0) {
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dst[i] = '?';
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} else {
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dst[i] = val[i];
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}
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}
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return dst;
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}
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int len = val.length >> 1;
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byte[] dst = new byte[len];
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int dp = 0;
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for (int i = 0; i < len; i++) {
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char c = StringUTF16.getChar(val, i);
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if (c < 0x80) {
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dst[dp++] = (byte)c;
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continue;
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}
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if (Character.isHighSurrogate(c) && i + 1 < len &&
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Character.isLowSurrogate(StringUTF16.getChar(val, i + 1))) {
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i++;
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}
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dst[dp++] = '?';
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}
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if (len == dp) {
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return dst;
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}
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return Arrays.copyOf(dst, dp);
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}
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static byte[] encodeUTF8(byte coder, byte[] val) {
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int dp = 0;
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byte[] dst;
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if (coder == LATIN1) {
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dst = new byte[val.length << 1];
|
|
for (int sp = 0; sp < val.length; sp++) {
|
|
byte c = val[sp];
|
|
if (c < 0) {
|
|
dst[dp++] = (byte)(0xc0 | ((c & 0xff) >> 6));
|
|
dst[dp++] = (byte)(0x80 | (c & 0x3f));
|
|
} else {
|
|
dst[dp++] = c;
|
|
}
|
|
}
|
|
} else {
|
|
int sp = 0;
|
|
int sl = val.length >> 1;
|
|
dst = new byte[sl * 3];
|
|
char c;
|
|
while (sp < sl && (c = StringUTF16.getChar(val, sp)) < '\u0080') {
|
|
// ascii fast loop;
|
|
dst[dp++] = (byte)c;
|
|
sp++;
|
|
}
|
|
while (sp < sl) {
|
|
c = StringUTF16.getChar(val, sp++);
|
|
if (c < 0x80) {
|
|
dst[dp++] = (byte)c;
|
|
} else if (c < 0x800) {
|
|
dst[dp++] = (byte)(0xc0 | (c >> 6));
|
|
dst[dp++] = (byte)(0x80 | (c & 0x3f));
|
|
} else if (Character.isSurrogate(c)) {
|
|
int uc = -1;
|
|
char c2;
|
|
if (Character.isHighSurrogate(c) && sp < sl &&
|
|
Character.isLowSurrogate(c2 = StringUTF16.getChar(val, sp))) {
|
|
uc = Character.toCodePoint(c, c2);
|
|
}
|
|
if (uc < 0) {
|
|
dst[dp++] = '?';
|
|
} else {
|
|
dst[dp++] = (byte)(0xf0 | ((uc >> 18)));
|
|
dst[dp++] = (byte)(0x80 | ((uc >> 12) & 0x3f));
|
|
dst[dp++] = (byte)(0x80 | ((uc >> 6) & 0x3f));
|
|
dst[dp++] = (byte)(0x80 | (uc & 0x3f));
|
|
sp++; // 2 chars
|
|
}
|
|
} else {
|
|
// 3 bytes, 16 bits
|
|
dst[dp++] = (byte)(0xe0 | ((c >> 12)));
|
|
dst[dp++] = (byte)(0x80 | ((c >> 6) & 0x3f));
|
|
dst[dp++] = (byte)(0x80 | (c & 0x3f));
|
|
}
|
|
}
|
|
}
|
|
if (dp == dst.length) {
|
|
return dst;
|
|
}
|
|
return Arrays.copyOf(dst, dp);
|
|
}
|
|
|
|
static byte[] encode(String charsetName, byte coder, byte[] val)
|
|
throws UnsupportedEncodingException
|
|
{
|
|
StringEncoder se = deref(encoder);
|
|
String csn = (charsetName == null) ? "ISO-8859-1" : charsetName;
|
|
if ((se == null) || !(csn.equals(se.requestedCharsetName())
|
|
|| csn.equals(se.charsetName()))) {
|
|
se = null;
|
|
try {
|
|
Charset cs = lookupCharset(csn);
|
|
if (cs != null) {
|
|
if (cs == UTF_8) {
|
|
return encodeUTF8(coder, val);
|
|
} else if (cs == ISO_8859_1) {
|
|
return encode8859_1(coder, val);
|
|
} else if (cs == US_ASCII) {
|
|
return encodeASCII(coder, val);
|
|
}
|
|
se = new StringEncoder(cs, csn);
|
|
}
|
|
} catch (IllegalCharsetNameException x) {}
|
|
if (se == null) {
|
|
throw new UnsupportedEncodingException (csn);
|
|
}
|
|
set(encoder, se);
|
|
}
|
|
return se.encode(coder, val);
|
|
}
|
|
|
|
static byte[] encode(Charset cs, byte coder, byte[] val) {
|
|
if (cs == UTF_8) {
|
|
return encodeUTF8(coder, val);
|
|
} else if (cs == ISO_8859_1) {
|
|
return encode8859_1(coder, val);
|
|
} else if (cs == US_ASCII) {
|
|
return encodeASCII(coder, val);
|
|
}
|
|
CharsetEncoder ce = cs.newEncoder();
|
|
// fastpath for ascii compatible
|
|
if (coder == LATIN1 && (((ce instanceof ArrayEncoder) &&
|
|
((ArrayEncoder)ce).isASCIICompatible() &&
|
|
!hasNegatives(val, 0, val.length)))) {
|
|
return Arrays.copyOf(val, val.length);
|
|
}
|
|
int len = val.length >> coder; // assume LATIN1=0/UTF16=1;
|
|
int en = scale(len, ce.maxBytesPerChar());
|
|
byte[] ba = new byte[en];
|
|
if (len == 0) {
|
|
return ba;
|
|
}
|
|
boolean isTrusted = System.getSecurityManager() == null ||
|
|
cs.getClass().getClassLoader0() == null;
|
|
ce.onMalformedInput(CodingErrorAction.REPLACE)
|
|
.onUnmappableCharacter(CodingErrorAction.REPLACE)
|
|
.reset();
|
|
if (ce instanceof ArrayEncoder) {
|
|
if (!isTrusted) {
|
|
val = Arrays.copyOf(val, val.length);
|
|
}
|
|
int blen = (coder == LATIN1 ) ? ((ArrayEncoder)ce).encodeFromLatin1(val, 0, len, ba)
|
|
: ((ArrayEncoder)ce).encodeFromUTF16(val, 0, len, ba);
|
|
if (blen != -1) {
|
|
return safeTrim(ba, blen, isTrusted);
|
|
}
|
|
}
|
|
char[] ca = (coder == LATIN1 ) ? StringLatin1.toChars(val)
|
|
: StringUTF16.toChars(val);
|
|
ByteBuffer bb = ByteBuffer.wrap(ba);
|
|
CharBuffer cb = CharBuffer.wrap(ca, 0, len);
|
|
try {
|
|
CoderResult cr = ce.encode(cb, bb, true);
|
|
if (!cr.isUnderflow())
|
|
cr.throwException();
|
|
cr = ce.flush(bb);
|
|
if (!cr.isUnderflow())
|
|
cr.throwException();
|
|
} catch (CharacterCodingException x) {
|
|
throw new Error(x);
|
|
}
|
|
return safeTrim(ba, bb.position(), isTrusted);
|
|
}
|
|
|
|
static byte[] encode(byte coder, byte[] val) {
|
|
String csn = Charset.defaultCharset().name();
|
|
try {
|
|
// use charset name encode() variant which provides caching.
|
|
return encode(csn, coder, val);
|
|
} catch (UnsupportedEncodingException x) {
|
|
warnUnsupportedCharset(csn);
|
|
}
|
|
try {
|
|
return encode("ISO-8859-1", coder, val);
|
|
} catch (UnsupportedEncodingException x) {
|
|
// If this code is hit during VM initialization, err(String) is
|
|
// the only way we will be able to get any kind of error message.
|
|
err("ISO-8859-1 charset not available: " + x.toString() + "\n");
|
|
// If we can not find ISO-8859-1 (a required encoding) then things
|
|
// are seriously wrong with the installation.
|
|
System.exit(1);
|
|
return null;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Print a message directly to stderr, bypassing all character conversion
|
|
* methods.
|
|
* @param msg message to print
|
|
*/
|
|
private static native void err(String msg);
|
|
}
|