| /*** |
| * ASM: a very small and fast Java bytecode manipulation framework |
| * Copyright (c) 2000-2011 INRIA, France Telecom |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of the copyright holders nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF |
| * THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| package org.eclipse.persistence.internal.libraries.asm.util; |
| |
| import org.eclipse.persistence.internal.libraries.asm.Opcodes; |
| import org.eclipse.persistence.internal.libraries.asm.signature.SignatureVisitor; |
| |
| /** |
| * A {@link SignatureVisitor} that checks that its methods are properly used. |
| * |
| * @author Eric Bruneton |
| */ |
| public class CheckSignatureAdapter extends SignatureVisitor { |
| |
| /** |
| * Type to be used to check class signatures. See |
| * {@link #CheckSignatureAdapter(int, SignatureVisitor) |
| * CheckSignatureAdapter}. |
| */ |
| public static final int CLASS_SIGNATURE = 0; |
| |
| /** |
| * Type to be used to check method signatures. See |
| * {@link #CheckSignatureAdapter(int, SignatureVisitor) |
| * CheckSignatureAdapter}. |
| */ |
| public static final int METHOD_SIGNATURE = 1; |
| |
| /** |
| * Type to be used to check type signatures.See |
| * {@link #CheckSignatureAdapter(int, SignatureVisitor) |
| * CheckSignatureAdapter}. |
| */ |
| public static final int TYPE_SIGNATURE = 2; |
| |
| private static final int EMPTY = 1; |
| |
| private static final int FORMAL = 2; |
| |
| private static final int BOUND = 4; |
| |
| private static final int SUPER = 8; |
| |
| private static final int PARAM = 16; |
| |
| private static final int RETURN = 32; |
| |
| private static final int SIMPLE_TYPE = 64; |
| |
| private static final int CLASS_TYPE = 128; |
| |
| private static final int END = 256; |
| |
| /** |
| * Type of the signature to be checked. |
| */ |
| private final int type; |
| |
| /** |
| * State of the automaton used to check the order of method calls. |
| */ |
| private int state; |
| |
| /** |
| * <tt>true</tt> if the checked type signature can be 'V'. |
| */ |
| private boolean canBeVoid; |
| |
| /** |
| * The visitor to which this adapter must delegate calls. May be |
| * <tt>null</tt>. |
| */ |
| private final SignatureVisitor sv; |
| |
| /** |
| * Creates a new {@link CheckSignatureAdapter} object. <i>Subclasses must |
| * not use this constructor</i>. Instead, they must use the |
| * {@link #CheckSignatureAdapter(int, int, SignatureVisitor)} version. |
| * |
| * @param type |
| * the type of signature to be checked. See |
| * {@link #CLASS_SIGNATURE}, {@link #METHOD_SIGNATURE} and |
| * {@link #TYPE_SIGNATURE}. |
| * @param sv |
| * the visitor to which this adapter must delegate calls. May be |
| * <tt>null</tt>. |
| */ |
| public CheckSignatureAdapter(final int type, final SignatureVisitor sv) { |
| this(Opcodes.ASM6, type, sv); |
| } |
| |
| /** |
| * Creates a new {@link CheckSignatureAdapter} object. |
| * |
| * @param api |
| * the ASM API version implemented by this visitor. Must be one |
| * of {@link Opcodes#ASM4}, {@link Opcodes#ASM5} or {@link Opcodes#ASM6}. |
| * @param type |
| * the type of signature to be checked. See |
| * {@link #CLASS_SIGNATURE}, {@link #METHOD_SIGNATURE} and |
| * {@link #TYPE_SIGNATURE}. |
| * @param sv |
| * the visitor to which this adapter must delegate calls. May be |
| * <tt>null</tt>. |
| */ |
| protected CheckSignatureAdapter(final int api, final int type, |
| final SignatureVisitor sv) { |
| super(api); |
| this.type = type; |
| this.state = EMPTY; |
| this.sv = sv; |
| } |
| |
| // class and method signatures |
| |
| @Override |
| public void visitFormalTypeParameter(final String name) { |
| if (type == TYPE_SIGNATURE |
| || (state != EMPTY && state != FORMAL && state != BOUND)) { |
| throw new IllegalStateException(); |
| } |
| CheckMethodAdapter.checkIdentifier(name, "formal type parameter"); |
| state = FORMAL; |
| if (sv != null) { |
| sv.visitFormalTypeParameter(name); |
| } |
| } |
| |
| @Override |
| public SignatureVisitor visitClassBound() { |
| if (state != FORMAL) { |
| throw new IllegalStateException(); |
| } |
| state = BOUND; |
| SignatureVisitor v = sv == null ? null : sv.visitClassBound(); |
| return new CheckSignatureAdapter(TYPE_SIGNATURE, v); |
| } |
| |
| @Override |
| public SignatureVisitor visitInterfaceBound() { |
| if (state != FORMAL && state != BOUND) { |
| throw new IllegalArgumentException(); |
| } |
| SignatureVisitor v = sv == null ? null : sv.visitInterfaceBound(); |
| return new CheckSignatureAdapter(TYPE_SIGNATURE, v); |
| } |
| |
| // class signatures |
| |
| @Override |
| public SignatureVisitor visitSuperclass() { |
| if (type != CLASS_SIGNATURE || (state & (EMPTY | FORMAL | BOUND)) == 0) { |
| throw new IllegalArgumentException(); |
| } |
| state = SUPER; |
| SignatureVisitor v = sv == null ? null : sv.visitSuperclass(); |
| return new CheckSignatureAdapter(TYPE_SIGNATURE, v); |
| } |
| |
| @Override |
| public SignatureVisitor visitInterface() { |
| if (state != SUPER) { |
| throw new IllegalStateException(); |
| } |
| SignatureVisitor v = sv == null ? null : sv.visitInterface(); |
| return new CheckSignatureAdapter(TYPE_SIGNATURE, v); |
| } |
| |
| // method signatures |
| |
| @Override |
| public SignatureVisitor visitParameterType() { |
| if (type != METHOD_SIGNATURE |
| || (state & (EMPTY | FORMAL | BOUND | PARAM)) == 0) { |
| throw new IllegalArgumentException(); |
| } |
| state = PARAM; |
| SignatureVisitor v = sv == null ? null : sv.visitParameterType(); |
| return new CheckSignatureAdapter(TYPE_SIGNATURE, v); |
| } |
| |
| @Override |
| public SignatureVisitor visitReturnType() { |
| if (type != METHOD_SIGNATURE |
| || (state & (EMPTY | FORMAL | BOUND | PARAM)) == 0) { |
| throw new IllegalArgumentException(); |
| } |
| state = RETURN; |
| SignatureVisitor v = sv == null ? null : sv.visitReturnType(); |
| CheckSignatureAdapter cv = new CheckSignatureAdapter(TYPE_SIGNATURE, v); |
| cv.canBeVoid = true; |
| return cv; |
| } |
| |
| @Override |
| public SignatureVisitor visitExceptionType() { |
| if (state != RETURN) { |
| throw new IllegalStateException(); |
| } |
| SignatureVisitor v = sv == null ? null : sv.visitExceptionType(); |
| return new CheckSignatureAdapter(TYPE_SIGNATURE, v); |
| } |
| |
| // type signatures |
| |
| @Override |
| public void visitBaseType(final char descriptor) { |
| if (type != TYPE_SIGNATURE || state != EMPTY) { |
| throw new IllegalStateException(); |
| } |
| if (descriptor == 'V') { |
| if (!canBeVoid) { |
| throw new IllegalArgumentException(); |
| } |
| } else { |
| if ("ZCBSIFJD".indexOf(descriptor) == -1) { |
| throw new IllegalArgumentException(); |
| } |
| } |
| state = SIMPLE_TYPE; |
| if (sv != null) { |
| sv.visitBaseType(descriptor); |
| } |
| } |
| |
| @Override |
| public void visitTypeVariable(final String name) { |
| if (type != TYPE_SIGNATURE || state != EMPTY) { |
| throw new IllegalStateException(); |
| } |
| CheckMethodAdapter.checkIdentifier(name, "type variable"); |
| state = SIMPLE_TYPE; |
| if (sv != null) { |
| sv.visitTypeVariable(name); |
| } |
| } |
| |
| @Override |
| public SignatureVisitor visitArrayType() { |
| if (type != TYPE_SIGNATURE || state != EMPTY) { |
| throw new IllegalStateException(); |
| } |
| state = SIMPLE_TYPE; |
| SignatureVisitor v = sv == null ? null : sv.visitArrayType(); |
| return new CheckSignatureAdapter(TYPE_SIGNATURE, v); |
| } |
| |
| @Override |
| public void visitClassType(final String name) { |
| if (type != TYPE_SIGNATURE || state != EMPTY) { |
| throw new IllegalStateException(); |
| } |
| CheckMethodAdapter.checkInternalName(name, "class name"); |
| state = CLASS_TYPE; |
| if (sv != null) { |
| sv.visitClassType(name); |
| } |
| } |
| |
| @Override |
| public void visitInnerClassType(final String name) { |
| if (state != CLASS_TYPE) { |
| throw new IllegalStateException(); |
| } |
| CheckMethodAdapter.checkIdentifier(name, "inner class name"); |
| if (sv != null) { |
| sv.visitInnerClassType(name); |
| } |
| } |
| |
| @Override |
| public void visitTypeArgument() { |
| if (state != CLASS_TYPE) { |
| throw new IllegalStateException(); |
| } |
| if (sv != null) { |
| sv.visitTypeArgument(); |
| } |
| } |
| |
| @Override |
| public SignatureVisitor visitTypeArgument(final char wildcard) { |
| if (state != CLASS_TYPE) { |
| throw new IllegalStateException(); |
| } |
| if ("+-=".indexOf(wildcard) == -1) { |
| throw new IllegalArgumentException(); |
| } |
| SignatureVisitor v = sv == null ? null : sv.visitTypeArgument(wildcard); |
| return new CheckSignatureAdapter(TYPE_SIGNATURE, v); |
| } |
| |
| @Override |
| public void visitEnd() { |
| if (state != CLASS_TYPE) { |
| throw new IllegalStateException(); |
| } |
| state = END; |
| if (sv != null) { |
| sv.visitEnd(); |
| } |
| } |
| } |