diff -r 168b03eb59ae -r 155af84b5cb5 jdk/src/java.base/share/classes/sun/invoke/anon/ConstantPoolPatch.java --- a/jdk/src/java.base/share/classes/sun/invoke/anon/ConstantPoolPatch.java Mon Dec 07 17:04:37 2015 +0000 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,503 +0,0 @@ -/* - * Copyright (c) 2008, 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 sun.invoke.anon; - -import java.io.IOException; -import java.io.OutputStream; -import java.util.Arrays; -import java.util.HashSet; -import java.util.IdentityHashMap; -import java.util.Map; - -import static sun.invoke.anon.ConstantPoolVisitor.*; - -/** A class and its patched constant pool. - * - * This class allow to modify (patch) a constant pool - * by changing the value of its entry. - * Entry are referenced using index that can be get - * by parsing the constant pool using - * {@link ConstantPoolParser#parse(ConstantPoolVisitor)}. - * - * @see ConstantPoolVisitor - * @see ConstantPoolParser#createPatch() - */ -public class ConstantPoolPatch { - final ConstantPoolParser outer; - final Object[] patchArray; - - ConstantPoolPatch(ConstantPoolParser outer) { - this.outer = outer; - this.patchArray = new Object[outer.getLength()]; - } - - /** Create a {@link ConstantPoolParser} and - * a {@link ConstantPoolPatch} in one step. - * Equivalent to {@code new ConstantPoolParser(classFile).createPatch()}. - * - * @param classFile an array of bytes containing a class. - * @see #ConstantPoolParser(Class) - */ - public ConstantPoolPatch(byte[] classFile) throws InvalidConstantPoolFormatException { - this(new ConstantPoolParser(classFile)); - } - - /** Create a {@link ConstantPoolParser} and - * a {@link ConstantPoolPatch} in one step. - * Equivalent to {@code new ConstantPoolParser(templateClass).createPatch()}. - * - * @param templateClass the class to parse. - * @see #ConstantPoolParser(Class) - */ - public ConstantPoolPatch(Class templateClass) throws IOException, InvalidConstantPoolFormatException { - this(new ConstantPoolParser(templateClass)); - } - - - /** Creates a patch from an existing patch. - * All changes are copied from that patch. - * @param patch a patch - * - * @see ConstantPoolParser#createPatch() - */ - public ConstantPoolPatch(ConstantPoolPatch patch) { - outer = patch.outer; - patchArray = patch.patchArray.clone(); - } - - /** Which parser built this patch? */ - public ConstantPoolParser getParser() { - return outer; - } - - /** Report the tag at the given index in the constant pool. */ - public byte getTag(int index) { - return outer.getTag(index); - } - - /** Report the current patch at the given index of the constant pool. - * Null means no patch will be made. - * To observe the unpatched entry at the given index, use - * {@link #getParser()}{@code .}@link ConstantPoolParser#parse(ConstantPoolVisitor)} - */ - public Object getPatch(int index) { - Object value = patchArray[index]; - if (value == null) return null; - switch (getTag(index)) { - case CONSTANT_Fieldref: - case CONSTANT_Methodref: - case CONSTANT_InterfaceMethodref: - if (value instanceof String) - value = stripSemis(2, (String) value); - break; - case CONSTANT_NameAndType: - if (value instanceof String) - value = stripSemis(1, (String) value); - break; - } - return value; - } - - /** Clear all patches. */ - public void clear() { - Arrays.fill(patchArray, null); - } - - /** Clear one patch. */ - public void clear(int index) { - patchArray[index] = null; - } - - /** Produce the patches as an array. */ - public Object[] getPatches() { - return patchArray.clone(); - } - - /** Produce the original constant pool as an array. */ - public Object[] getOriginalCP() throws InvalidConstantPoolFormatException { - return getOriginalCP(0, patchArray.length, -1); - } - - /** Walk the constant pool, applying patches using the given map. - * - * @param utf8Map Utf8 strings to modify, if encountered - * @param classMap Classes (or their names) to modify, if encountered - * @param valueMap Constant values to modify, if encountered - * @param deleteUsedEntries if true, delete map entries that are used - */ - public void putPatches(final Map utf8Map, - final Map classMap, - final Map valueMap, - boolean deleteUsedEntries) throws InvalidConstantPoolFormatException { - final HashSet usedUtf8Keys; - final HashSet usedClassKeys; - final HashSet usedValueKeys; - if (deleteUsedEntries) { - usedUtf8Keys = (utf8Map == null) ? null : new HashSet(); - usedClassKeys = (classMap == null) ? null : new HashSet(); - usedValueKeys = (valueMap == null) ? null : new HashSet(); - } else { - usedUtf8Keys = null; - usedClassKeys = null; - usedValueKeys = null; - } - - outer.parse(new ConstantPoolVisitor() { - - @Override - public void visitUTF8(int index, byte tag, String utf8) { - putUTF8(index, utf8Map.get(utf8)); - if (usedUtf8Keys != null) usedUtf8Keys.add(utf8); - } - - @Override - public void visitConstantValue(int index, byte tag, Object value) { - putConstantValue(index, tag, valueMap.get(value)); - if (usedValueKeys != null) usedValueKeys.add(value); - } - - @Override - public void visitConstantString(int index, byte tag, String name, int nameIndex) { - if (tag == CONSTANT_Class) { - putConstantValue(index, tag, classMap.get(name)); - if (usedClassKeys != null) usedClassKeys.add(name); - } else { - assert(tag == CONSTANT_String); - visitConstantValue(index, tag, name); - } - } - }); - if (usedUtf8Keys != null) utf8Map.keySet().removeAll(usedUtf8Keys); - if (usedClassKeys != null) classMap.keySet().removeAll(usedClassKeys); - if (usedValueKeys != null) valueMap.keySet().removeAll(usedValueKeys); - } - - Object[] getOriginalCP(final int startIndex, - final int endIndex, - final int tagMask) throws InvalidConstantPoolFormatException { - final Object[] cpArray = new Object[endIndex - startIndex]; - outer.parse(new ConstantPoolVisitor() { - - void show(int index, byte tag, Object value) { - if (index < startIndex || index >= endIndex) return; - if (((1 << tag) & tagMask) == 0) return; - cpArray[index - startIndex] = value; - } - - @Override - public void visitUTF8(int index, byte tag, String utf8) { - show(index, tag, utf8); - } - - @Override - public void visitConstantValue(int index, byte tag, Object value) { - assert(tag != CONSTANT_String); - show(index, tag, value); - } - - @Override - public void visitConstantString(int index, byte tag, - String value, int j) { - show(index, tag, value); - } - - @Override - public void visitMemberRef(int index, byte tag, - String className, String memberName, - String signature, - int j, int k) { - show(index, tag, new String[]{ className, memberName, signature }); - } - - @Override - public void visitDescriptor(int index, byte tag, - String memberName, String signature, - int j, int k) { - show(index, tag, new String[]{ memberName, signature }); - } - }); - return cpArray; - } - - /** Write the head (header plus constant pool) - * of the patched class file to the indicated stream. - */ - void writeHead(OutputStream out) throws IOException { - outer.writePatchedHead(out, patchArray); - } - - /** Write the tail (everything after the constant pool) - * of the patched class file to the indicated stream. - */ - void writeTail(OutputStream out) throws IOException { - outer.writeTail(out); - } - - private void checkConstantTag(byte tag, Object value) { - if (value == null) - throw new IllegalArgumentException( - "invalid null constant value"); - if (classForTag(tag) != value.getClass()) - throw new IllegalArgumentException( - "invalid constant value" - + (tag == CONSTANT_None ? "" - : " for tag "+tagName(tag)) - + " of class "+value.getClass()); - } - - private void checkTag(int index, byte putTag) { - byte tag = outer.tags[index]; - if (tag != putTag) - throw new IllegalArgumentException( - "invalid put operation" - + " for " + tagName(putTag) - + " at index " + index + " found " + tagName(tag)); - } - - private void checkTagMask(int index, int tagBitMask) { - byte tag = outer.tags[index]; - int tagBit = ((tag & 0x1F) == tag) ? (1 << tag) : 0; - if ((tagBit & tagBitMask) == 0) - throw new IllegalArgumentException( - "invalid put operation" - + " at index " + index + " found " + tagName(tag)); - } - - private static void checkMemberName(String memberName) { - if (memberName.indexOf(';') >= 0) - throw new IllegalArgumentException("memberName " + memberName + " contains a ';'"); - } - - /** Set the entry of the constant pool indexed by index to - * a new string. - * - * @param index an index to a constant pool entry containing a - * {@link ConstantPoolVisitor#CONSTANT_Utf8} value. - * @param utf8 a string - * - * @see ConstantPoolVisitor#visitUTF8(int, byte, String) - */ - public void putUTF8(int index, String utf8) { - if (utf8 == null) { clear(index); return; } - checkTag(index, CONSTANT_Utf8); - patchArray[index] = utf8; - } - - /** Set the entry of the constant pool indexed by index to - * a new value, depending on its dynamic type. - * - * @param index an index to a constant pool entry containing a - * one of the following structures: - * {@link ConstantPoolVisitor#CONSTANT_Integer}, - * {@link ConstantPoolVisitor#CONSTANT_Float}, - * {@link ConstantPoolVisitor#CONSTANT_Long}, - * {@link ConstantPoolVisitor#CONSTANT_Double}, - * {@link ConstantPoolVisitor#CONSTANT_String}, or - * {@link ConstantPoolVisitor#CONSTANT_Class} - * @param value a boxed int, float, long or double; or a string or class object - * @throws IllegalArgumentException if the type of the constant does not - * match the constant pool entry type, - * as reported by {@link #getTag(int)} - * - * @see #putConstantValue(int, byte, Object) - * @see ConstantPoolVisitor#visitConstantValue(int, byte, Object) - * @see ConstantPoolVisitor#visitConstantString(int, byte, String, int) - */ - public void putConstantValue(int index, Object value) { - if (value == null) { clear(index); return; } - byte tag = tagForConstant(value.getClass()); - checkConstantTag(tag, value); - checkTag(index, tag); - patchArray[index] = value; - } - - /** Set the entry of the constant pool indexed by index to - * a new value. - * - * @param index an index to a constant pool entry matching the given tag - * @param tag one of the following values: - * {@link ConstantPoolVisitor#CONSTANT_Integer}, - * {@link ConstantPoolVisitor#CONSTANT_Float}, - * {@link ConstantPoolVisitor#CONSTANT_Long}, - * {@link ConstantPoolVisitor#CONSTANT_Double}, - * {@link ConstantPoolVisitor#CONSTANT_String}, or - * {@link ConstantPoolVisitor#CONSTANT_Class} - * @param value a boxed number, string, or class object - * @throws IllegalArgumentException if the type of the constant does not - * match the constant pool entry type, or if a class name contains - * '/' or ';' - * - * @see #putConstantValue(int, Object) - * @see ConstantPoolVisitor#visitConstantValue(int, byte, Object) - * @see ConstantPoolVisitor#visitConstantString(int, byte, String, int) - */ - public void putConstantValue(int index, byte tag, Object value) { - if (value == null) { clear(index); return; } - checkTag(index, tag); - if (tag == CONSTANT_Class && value instanceof String) { - checkClassName((String) value); - } else if (tag == CONSTANT_String) { - // the JVM accepts any object as a patch for a string - } else { - // make sure the incoming value is the right type - checkConstantTag(tag, value); - } - checkTag(index, tag); - patchArray[index] = value; - } - - /** Set the entry of the constant pool indexed by index to - * a new {@link ConstantPoolVisitor#CONSTANT_NameAndType} value. - * - * @param index an index to a constant pool entry containing a - * {@link ConstantPoolVisitor#CONSTANT_NameAndType} value. - * @param memberName a memberName - * @param signature a signature - * @throws IllegalArgumentException if memberName contains the character ';' - * - * @see ConstantPoolVisitor#visitDescriptor(int, byte, String, String, int, int) - */ - public void putDescriptor(int index, String memberName, String signature) { - checkTag(index, CONSTANT_NameAndType); - checkMemberName(memberName); - patchArray[index] = addSemis(memberName, signature); - } - - /** Set the entry of the constant pool indexed by index to - * a new {@link ConstantPoolVisitor#CONSTANT_Fieldref}, - * {@link ConstantPoolVisitor#CONSTANT_Methodref}, or - * {@link ConstantPoolVisitor#CONSTANT_InterfaceMethodref} value. - * - * @param index an index to a constant pool entry containing a member reference - * @param className a class name - * @param memberName a field or method name - * @param signature a field or method signature - * @throws IllegalArgumentException if memberName contains the character ';' - * or signature is not a correct signature - * - * @see ConstantPoolVisitor#visitMemberRef(int, byte, String, String, String, int, int) - */ - public void putMemberRef(int index, byte tag, - String className, String memberName, String signature) { - checkTagMask(tag, CONSTANT_MemberRef_MASK); - checkTag(index, tag); - checkClassName(className); - checkMemberName(memberName); - if (signature.startsWith("(") == (tag == CONSTANT_Fieldref)) - throw new IllegalArgumentException("bad signature: "+signature); - patchArray[index] = addSemis(className, memberName, signature); - } - - private static final int CONSTANT_MemberRef_MASK = - CONSTANT_Fieldref - | CONSTANT_Methodref - | CONSTANT_InterfaceMethodref; - - private static final Map, Byte> CONSTANT_VALUE_CLASS_TAG - = new IdentityHashMap, Byte>(6); - private static final Class[] CONSTANT_VALUE_CLASS = new Class[16]; - static { - Object[][] values = { - {Integer.class, CONSTANT_Integer}, - {Long.class, CONSTANT_Long}, - {Float.class, CONSTANT_Float}, - {Double.class, CONSTANT_Double}, - {String.class, CONSTANT_String}, - {Class.class, CONSTANT_Class} - }; - for (Object[] value : values) { - Class cls = (Class)value[0]; - Byte tag = (Byte) value[1]; - CONSTANT_VALUE_CLASS_TAG.put(cls, tag); - CONSTANT_VALUE_CLASS[(byte)tag] = cls; - } - } - - static Class classForTag(byte tag) { - if ((tag & 0xFF) >= CONSTANT_VALUE_CLASS.length) - return null; - return CONSTANT_VALUE_CLASS[tag]; - } - - static byte tagForConstant(Class cls) { - Byte tag = CONSTANT_VALUE_CLASS_TAG.get(cls); - return (tag == null) ? CONSTANT_None : (byte)tag; - } - - private static void checkClassName(String className) { - if (className.indexOf('/') >= 0 || className.indexOf(';') >= 0) - throw new IllegalArgumentException("invalid class name " + className); - } - - static String addSemis(String name, String... names) { - StringBuilder buf = new StringBuilder(name.length() * 5); - buf.append(name); - for (String name2 : names) { - buf.append(';').append(name2); - } - String res = buf.toString(); - assert(stripSemis(names.length, res)[0].equals(name)); - assert(stripSemis(names.length, res)[1].equals(names[0])); - assert(names.length == 1 || - stripSemis(names.length, res)[2].equals(names[1])); - return res; - } - - static String[] stripSemis(int count, String string) { - String[] res = new String[count+1]; - int pos = 0; - for (int i = 0; i < count; i++) { - int pos2 = string.indexOf(';', pos); - if (pos2 < 0) pos2 = string.length(); // yuck - res[i] = string.substring(pos, pos2); - pos = pos2; - } - res[count] = string.substring(pos); - return res; - } - - public String toString() { - StringBuilder buf = new StringBuilder(this.getClass().getName()); - buf.append("{"); - Object[] origCP = null; - for (int i = 0; i < patchArray.length; i++) { - if (patchArray[i] == null) continue; - if (origCP != null) { - buf.append(", "); - } else { - try { - origCP = getOriginalCP(); - } catch (InvalidConstantPoolFormatException ee) { - origCP = new Object[0]; - } - } - Object orig = (i < origCP.length) ? origCP[i] : "?"; - buf.append(orig).append("=").append(patchArray[i]); - } - buf.append("}"); - return buf.toString(); - } -}