239 lines
9.5 KiB
Java
239 lines
9.5 KiB
Java
/*
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* Copyright (c) 2018, 2019, 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.constant;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Set;
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import static java.util.Objects.requireNonNull;
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/**
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* Helper methods for the implementation of {@code java.lang.constant}.
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*/
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class ConstantUtils {
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/** an empty constant descriptor */
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public static final ConstantDesc[] EMPTY_CONSTANTDESC = new ConstantDesc[0];
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static final Constable[] EMPTY_CONSTABLE = new Constable[0];
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static final int MAX_ARRAY_TYPE_DESC_DIMENSIONS = 255;
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private static final Set<String> pointyNames = Set.of("<init>", "<clinit>");
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/**
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* Validates the correctness of a binary class name. In particular checks for the presence of
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* invalid characters in the name.
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*
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* @param name the class name
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* @return the class name passed if valid
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* @throws IllegalArgumentException if the class name is invalid
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*/
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static String validateBinaryClassName(String name) {
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for (int i=0; i<name.length(); i++) {
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char ch = name.charAt(i);
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if (ch == ';' || ch == '[' || ch == '/')
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throw new IllegalArgumentException("Invalid class name: " + name);
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}
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return name;
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}
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/**
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* Validates a member name
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*
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* @param name the name of the member
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* @return the name passed if valid
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* @throws IllegalArgumentException if the member name is invalid
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*/
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public static String validateMemberName(String name, boolean method) {
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requireNonNull(name);
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if (name.length() == 0)
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throw new IllegalArgumentException("zero-length member name");
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for (int i=0; i<name.length(); i++) {
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char ch = name.charAt(i);
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if (ch == '.' || ch == ';' || ch == '[' || ch == '/')
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throw new IllegalArgumentException("Invalid member name: " + name);
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if (method && (ch == '<' || ch == '>')) {
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if (!pointyNames.contains(name))
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throw new IllegalArgumentException("Invalid member name: " + name);
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}
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}
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return name;
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}
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static void validateClassOrInterface(ClassDesc classDesc) {
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if (!classDesc.isClassOrInterface())
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throw new IllegalArgumentException("not a class or interface type: " + classDesc);
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}
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static int arrayDepth(String descriptorString) {
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int depth = 0;
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while (descriptorString.charAt(depth) == '[')
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depth++;
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return depth;
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}
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static String binaryToInternal(String name) {
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return name.replace('.', '/');
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}
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static String internalToBinary(String name) {
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return name.replace('/', '.');
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}
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static String dropLastChar(String s) {
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return s.substring(0, s.length() - 1);
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}
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static String dropFirstAndLastChar(String s) {
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return s.substring(1, s.length() - 1);
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}
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/**
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* Parses a method descriptor string, and return a list of field descriptor
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* strings, return type first, then parameter types
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*
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* @param descriptor the descriptor string
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* @return the list of types
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* @throws IllegalArgumentException if the descriptor string is not valid
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*/
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static List<String> parseMethodDescriptor(String descriptor) {
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int cur = 0, end = descriptor.length();
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ArrayList<String> ptypes = new ArrayList<>();
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if (cur >= end || descriptor.charAt(cur) != '(')
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throw new IllegalArgumentException("Bad method descriptor: " + descriptor);
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++cur; // skip '('
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while (cur < end && descriptor.charAt(cur) != ')') {
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int len = skipOverFieldSignature(descriptor, cur, end, false);
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if (len == 0)
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throw new IllegalArgumentException("Bad method descriptor: " + descriptor);
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ptypes.add(descriptor.substring(cur, cur + len));
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cur += len;
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}
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if (cur >= end)
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throw new IllegalArgumentException("Bad method descriptor: " + descriptor);
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++cur; // skip ')'
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int rLen = skipOverFieldSignature(descriptor, cur, end, true);
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if (rLen == 0 || cur + rLen != end)
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throw new IllegalArgumentException("Bad method descriptor: " + descriptor);
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ptypes.add(0, descriptor.substring(cur, cur + rLen));
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return ptypes;
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}
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private static final char JVM_SIGNATURE_ARRAY = '[';
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private static final char JVM_SIGNATURE_BYTE = 'B';
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private static final char JVM_SIGNATURE_CHAR = 'C';
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private static final char JVM_SIGNATURE_CLASS = 'L';
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private static final char JVM_SIGNATURE_ENDCLASS = ';';
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private static final char JVM_SIGNATURE_ENUM = 'E';
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private static final char JVM_SIGNATURE_FLOAT = 'F';
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private static final char JVM_SIGNATURE_DOUBLE = 'D';
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private static final char JVM_SIGNATURE_FUNC = '(';
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private static final char JVM_SIGNATURE_ENDFUNC = ')';
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private static final char JVM_SIGNATURE_INT = 'I';
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private static final char JVM_SIGNATURE_LONG = 'J';
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private static final char JVM_SIGNATURE_SHORT = 'S';
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private static final char JVM_SIGNATURE_VOID = 'V';
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private static final char JVM_SIGNATURE_BOOLEAN = 'Z';
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/**
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* Validates that the characters at [start, end) within the provided string
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* describe a valid field type descriptor.
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* @param descriptor the descriptor string
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* @param start the starting index into the string
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* @param end the ending index within the string
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* @param voidOK is void acceptable?
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* @return the length of the descriptor, or 0 if it is not a descriptor
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* @throws IllegalArgumentException if the descriptor string is not valid
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*/
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@SuppressWarnings("fallthrough")
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static int skipOverFieldSignature(String descriptor, int start, int end, boolean voidOK) {
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int arrayDim = 0;
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int index = start;
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while (index < end) {
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switch (descriptor.charAt(index)) {
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case JVM_SIGNATURE_VOID: if (!voidOK) { return index; }
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case JVM_SIGNATURE_BOOLEAN:
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case JVM_SIGNATURE_BYTE:
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case JVM_SIGNATURE_CHAR:
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case JVM_SIGNATURE_SHORT:
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case JVM_SIGNATURE_INT:
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case JVM_SIGNATURE_FLOAT:
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case JVM_SIGNATURE_LONG:
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case JVM_SIGNATURE_DOUBLE:
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return index - start + 1;
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case JVM_SIGNATURE_CLASS:
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// Skip leading 'L' and ignore first appearance of ';'
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index++;
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int indexOfSemi = descriptor.indexOf(';', index);
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if (indexOfSemi != -1) {
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String unqualifiedName = descriptor.substring(index, indexOfSemi);
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boolean legal = verifyUnqualifiedClassName(unqualifiedName);
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if (!legal) {
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return 0;
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}
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return index - start + unqualifiedName.length() + 1;
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}
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return 0;
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case JVM_SIGNATURE_ARRAY:
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arrayDim++;
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if (arrayDim > MAX_ARRAY_TYPE_DESC_DIMENSIONS) {
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throw new IllegalArgumentException(String.format("Cannot create an array type descriptor with more than %d dimensions",
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ConstantUtils.MAX_ARRAY_TYPE_DESC_DIMENSIONS));
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}
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// The rest of what's there better be a legal descriptor
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index++;
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voidOK = false;
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break;
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default:
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return 0;
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}
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}
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return 0;
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}
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static boolean verifyUnqualifiedClassName(String name) {
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for (int index = 0; index < name.length(); index++) {
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char ch = name.charAt(index);
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if (ch < 128) {
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if (ch == '.' || ch == ';' || ch == '[' ) {
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return false; // do not permit '.', ';', or '['
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}
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if (ch == '/') {
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// check for '//' or leading or trailing '/' which are not legal
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// unqualified name must not be empty
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if (index == 0 || index + 1 >= name.length() || name.charAt(index + 1) == '/') {
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return false;
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}
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}
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} else {
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index ++;
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}
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}
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return true;
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}
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}
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