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Eclipse Compiler for Java(TM)
/*******************************************************************************
* Copyright (c) 2005, 2016 BEA Systems, Inc.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* [email protected] - initial API and implementation
* [email protected] - add hashCode() and equals(..) methods
*******************************************************************************/
package org.eclipse.jdt.internal.compiler.classfmt;
import java.util.Arrays;
import org.eclipse.jdt.core.compiler.CharOperation;
import org.eclipse.jdt.internal.compiler.ast.Annotation;
import org.eclipse.jdt.internal.compiler.codegen.ConstantPool;
import org.eclipse.jdt.internal.compiler.env.*;
import org.eclipse.jdt.internal.compiler.impl.*;
import org.eclipse.jdt.internal.compiler.lookup.TagBits;
import org.eclipse.jdt.internal.compiler.util.Util;
public class AnnotationInfo extends ClassFileStruct implements IBinaryAnnotation {
/** The name of the annotation type */
private char[] typename;
/**
* null until this annotation is initialized
* @see #getElementValuePairs()
*/
private volatile ElementValuePairInfo[] pairs;
long standardAnnotationTagBits = 0;
int readOffset = 0;
static Object[] EmptyValueArray = new Object[0];
public RuntimeException exceptionDuringDecode;
AnnotationInfo(byte[] classFileBytes, int[] contantPoolOffsets, int offset) {
super(classFileBytes, contantPoolOffsets, offset);
}
/**
* @param offset the offset into classFileBytes for the "type_index" of the annotation attribute.
* @param populate true to indicate to build out the annotation structure.
*/
AnnotationInfo(byte[] classFileBytes, int[] contantPoolOffsets, int offset, boolean runtimeVisible, boolean populate) {
this(classFileBytes, contantPoolOffsets, offset);
if (populate)
decodeAnnotation();
else
this.readOffset = scanAnnotation(0, runtimeVisible, true);
}
private void decodeAnnotation() {
this.readOffset = 0;
int utf8Offset = this.constantPoolOffsets[u2At(0)] - this.structOffset;
this.typename = utf8At(utf8Offset + 3, u2At(utf8Offset + 1));
int numberOfPairs = u2At(2);
// u2 type_index + u2 num_member_value_pair
this.readOffset += 4;
ElementValuePairInfo[] decodedPairs = numberOfPairs == 0 ? ElementValuePairInfo.NoMembers : new ElementValuePairInfo[numberOfPairs];
int i = 0;
try {
while (i < numberOfPairs) {
// u2 member_name_index;
utf8Offset = this.constantPoolOffsets[u2At(this.readOffset)] - this.structOffset;
char[] membername = utf8At(utf8Offset + 3, u2At(utf8Offset + 1));
this.readOffset += 2;
Object value = decodeDefaultValue();
decodedPairs[i++] = new ElementValuePairInfo(membername, value);
}
this.pairs = decodedPairs;
} catch (RuntimeException any) {
sanitizePairs(decodedPairs);
StringBuilder newMessage = new StringBuilder(any.getMessage());
newMessage.append(" while decoding pair #").append(i).append(" of annotation @").append(this.typename); //$NON-NLS-1$ //$NON-NLS-2$
newMessage.append(", bytes at structOffset ").append(this.structOffset).append(":"); //$NON-NLS-1$ //$NON-NLS-2$
int offset = this.structOffset;
while (offset <= this.structOffset+this.readOffset && offset < this.reference.length) {
newMessage.append(' ').append(Integer.toHexString(this.reference[offset++] & 0xFF));
}
throw new IllegalStateException(newMessage.toString(), any);
}
}
private void sanitizePairs(ElementValuePairInfo[] oldPairs) {
if (oldPairs != null) {
ElementValuePairInfo[] newPairs = new ElementValuePairInfo[oldPairs.length];
int count = 0;
for (int i = 0; i < oldPairs.length; i++) {
ElementValuePairInfo evpInfo = oldPairs[i];
if (evpInfo != null)
newPairs[count++] = evpInfo;
}
if (count < oldPairs.length) {
this.pairs = Arrays.copyOf(newPairs, count);
} else {
this.pairs = newPairs;
}
} else {
this.pairs = ElementValuePairInfo.NoMembers;
}
}
Object decodeDefaultValue() {
Object value = null;
// u1 tag;
int tag = u1At(this.readOffset);
this.readOffset++;
int constValueOffset = -1;
switch (tag) {
case 'Z': // boolean constant
constValueOffset = this.constantPoolOffsets[u2At(this.readOffset)] - this.structOffset;
value = BooleanConstant.fromValue(i4At(constValueOffset + 1) == 1);
this.readOffset += 2;
break;
case 'I': // integer constant
constValueOffset = this.constantPoolOffsets[u2At(this.readOffset)] - this.structOffset;
value = IntConstant.fromValue(i4At(constValueOffset + 1));
this.readOffset += 2;
break;
case 'C': // char constant
constValueOffset = this.constantPoolOffsets[u2At(this.readOffset)] - this.structOffset;
value = CharConstant.fromValue((char) i4At(constValueOffset + 1));
this.readOffset += 2;
break;
case 'B': // byte constant
constValueOffset = this.constantPoolOffsets[u2At(this.readOffset)] - this.structOffset;
value = ByteConstant.fromValue((byte) i4At(constValueOffset + 1));
this.readOffset += 2;
break;
case 'S': // short constant
constValueOffset = this.constantPoolOffsets[u2At(this.readOffset)] - this.structOffset;
value = ShortConstant.fromValue((short) i4At(constValueOffset + 1));
this.readOffset += 2;
break;
case 'D': // double constant
constValueOffset = this.constantPoolOffsets[u2At(this.readOffset)] - this.structOffset;
value = DoubleConstant.fromValue(doubleAt(constValueOffset + 1));
this.readOffset += 2;
break;
case 'F': // float constant
constValueOffset = this.constantPoolOffsets[u2At(this.readOffset)] - this.structOffset;
value = FloatConstant.fromValue(floatAt(constValueOffset + 1));
this.readOffset += 2;
break;
case 'J': // long constant
constValueOffset = this.constantPoolOffsets[u2At(this.readOffset)] - this.structOffset;
value = LongConstant.fromValue(i8At(constValueOffset + 1));
this.readOffset += 2;
break;
case 's': // String
constValueOffset = this.constantPoolOffsets[u2At(this.readOffset)] - this.structOffset;
value = StringConstant.fromValue(String.valueOf(utf8At(constValueOffset + 3, u2At(constValueOffset + 1))));
this.readOffset += 2;
break;
case 'e':
constValueOffset = this.constantPoolOffsets[u2At(this.readOffset)] - this.structOffset;
char[] typeName = utf8At(constValueOffset + 3, u2At(constValueOffset + 1));
this.readOffset += 2;
constValueOffset = this.constantPoolOffsets[u2At(this.readOffset)] - this.structOffset;
char[] constName = utf8At(constValueOffset + 3, u2At(constValueOffset + 1));
this.readOffset += 2;
value = new EnumConstantSignature(typeName, constName);
break;
case 'c':
constValueOffset = this.constantPoolOffsets[u2At(this.readOffset)] - this.structOffset;
char[] className = utf8At(constValueOffset + 3, u2At(constValueOffset + 1));
value = new ClassSignature(className);
this.readOffset += 2;
break;
case '@':
value = new AnnotationInfo(this.reference, this.constantPoolOffsets, this.readOffset + this.structOffset, false, true);
this.readOffset += ((AnnotationInfo) value).readOffset;
break;
case '[':
int numberOfValues = u2At(this.readOffset);
this.readOffset += 2;
if (numberOfValues == 0) {
value = EmptyValueArray;
} else {
Object[] arrayElements = new Object[numberOfValues];
value = arrayElements;
for (int i = 0; i < numberOfValues; i++)
arrayElements[i] = decodeDefaultValue();
}
break;
default:
String tagDisplay = tag == 0 ? "0x00" : (char) tag + " ("+Integer.toHexString(tag&0xFF)+')'; //$NON-NLS-1$//$NON-NLS-2$
throw new IllegalStateException("Unrecognized tag " + tagDisplay); //$NON-NLS-1$
}
return value;
}
@Override
public IBinaryElementValuePair[] getElementValuePairs() {
if (this.pairs == null)
lazyInitialize();
return this.pairs;
}
@Override
public char[] getTypeName() {
return this.typename;
}
@Override
public boolean isDeprecatedAnnotation() {
return (this.standardAnnotationTagBits & (TagBits.AnnotationDeprecated | TagBits.AnnotationTerminallyDeprecated)) != 0;
}
void initialize() {
if (this.pairs == null)
decodeAnnotation();
}
synchronized void lazyInitialize() {
if (this.pairs == null)
decodeAnnotation();
}
private int readRetentionPolicy(int offset) {
int currentOffset = offset;
int tag = u1At(currentOffset);
currentOffset++;
switch (tag) {
case 'e':
int utf8Offset = this.constantPoolOffsets[u2At(currentOffset)] - this.structOffset;
char[] typeName = utf8At(utf8Offset + 3, u2At(utf8Offset + 1));
currentOffset += 2;
if (typeName.length == 38 && CharOperation.equals(typeName, ConstantPool.JAVA_LANG_ANNOTATION_RETENTIONPOLICY)) {
utf8Offset = this.constantPoolOffsets[u2At(currentOffset)] - this.structOffset;
char[] constName = utf8At(utf8Offset + 3, u2At(utf8Offset + 1));
this.standardAnnotationTagBits |= Annotation.getRetentionPolicy(constName);
}
currentOffset += 2;
break;
case 'B':
case 'C':
case 'D':
case 'F':
case 'I':
case 'J':
case 'S':
case 'Z':
case 's':
case 'c':
currentOffset += 2;
break;
case '@':
// none of the supported standard annotation are in the nested
// level.
currentOffset = scanAnnotation(currentOffset, false, false);
break;
case '[':
int numberOfValues = u2At(currentOffset);
currentOffset += 2;
for (int i = 0; i < numberOfValues; i++)
currentOffset = scanElementValue(currentOffset);
break;
default:
throw new IllegalStateException();
}
return currentOffset;
}
private int readTargetValue(int offset) {
int currentOffset = offset;
int tag = u1At(currentOffset);
currentOffset++;
switch (tag) {
case 'e':
int utf8Offset = this.constantPoolOffsets[u2At(currentOffset)] - this.structOffset;
char[] typeName = utf8At(utf8Offset + 3, u2At(utf8Offset + 1));
currentOffset += 2;
if (typeName.length == 34 && CharOperation.equals(typeName, ConstantPool.JAVA_LANG_ANNOTATION_ELEMENTTYPE)) {
utf8Offset = this.constantPoolOffsets[u2At(currentOffset)] - this.structOffset;
char[] constName = utf8At(utf8Offset + 3, u2At(utf8Offset + 1));
this.standardAnnotationTagBits |= Annotation.getTargetElementType(constName);
}
currentOffset += 2;
break;
case 'B':
case 'C':
case 'D':
case 'F':
case 'I':
case 'J':
case 'S':
case 'Z':
case 's':
case 'c':
currentOffset += 2;
break;
case '@':
// none of the supported standard annotation are in the nested
// level.
currentOffset = scanAnnotation(currentOffset, false, false);
break;
case '[':
int numberOfValues = u2At(currentOffset);
currentOffset += 2;
if (numberOfValues == 0) {
this.standardAnnotationTagBits |= TagBits.AnnotationTarget;
} else {
for (int i = 0; i < numberOfValues; i++)
currentOffset = readTargetValue(currentOffset);
}
break;
default:
throw new IllegalStateException();
}
return currentOffset;
}
/**
* Read through this annotation in order to figure out the necessary tag
* bits and the length of this annotation. The data structure will not be
* flushed out.
*
* The tag bits are derived from the following (supported) standard
* annotation. java.lang.annotation.Documented,
* java.lang.annotation.Retention, java.lang.annotation.Target, and
* java.lang.Deprecated
*
* @param expectRuntimeVisibleAnno
* true to indicate that this is a runtime-visible annotation
* @param toplevel false to indicate that an nested annotation is read.
* true otherwise
* @return the next offset to read.
*/
private int scanAnnotation(int offset, boolean expectRuntimeVisibleAnno, boolean toplevel) {
int currentOffset = offset;
int utf8Offset = this.constantPoolOffsets[u2At(offset)] - this.structOffset;
char[] typeName = utf8At(utf8Offset + 3, u2At(utf8Offset + 1));
if (toplevel)
this.typename = typeName;
int numberOfPairs = u2At(offset + 2);
// u2 type_index + u2 number_member_value_pair
currentOffset += 4;
if (expectRuntimeVisibleAnno && toplevel) {
switch (typeName.length) {
case 22:
if (CharOperation.equals(typeName, ConstantPool.JAVA_LANG_DEPRECATED)) {
this.standardAnnotationTagBits |= TagBits.AnnotationDeprecated;
}
break;
case 23:
if (CharOperation.equals(typeName, ConstantPool.JAVA_LANG_SAFEVARARGS)) {
this.standardAnnotationTagBits |= TagBits.AnnotationSafeVarargs;
return currentOffset;
}
break;
case 29:
if (CharOperation.equals(typeName, ConstantPool.JAVA_LANG_ANNOTATION_TARGET)) {
currentOffset += 2;
return readTargetValue(currentOffset);
}
break;
case 32:
if (CharOperation.equals(typeName, ConstantPool.JAVA_LANG_ANNOTATION_RETENTION)) {
currentOffset += 2;
return readRetentionPolicy(currentOffset);
}
if (CharOperation.equals(typeName, ConstantPool.JAVA_LANG_ANNOTATION_INHERITED)) {
this.standardAnnotationTagBits |= TagBits.AnnotationInherited;
return currentOffset;
}
break;
case 33:
if (CharOperation.equals(typeName, ConstantPool.JAVA_LANG_ANNOTATION_DOCUMENTED)) {
this.standardAnnotationTagBits |= TagBits.AnnotationDocumented;
return currentOffset;
}
break;
case 52:
if (CharOperation.equals(typeName, ConstantPool.JAVA_LANG_INVOKE_METHODHANDLE_POLYMORPHICSIGNATURE)) {
this.standardAnnotationTagBits |= TagBits.AnnotationPolymorphicSignature;
return currentOffset;
}
break;
}
}
for (int i = 0; i < numberOfPairs; i++) {
// u2 member_name_index
currentOffset += 2;
currentOffset = scanElementValue(currentOffset);
}
return currentOffset;
}
/**
* @param offset
* the offset to start reading.
* @return the next offset to read.
*/
private int scanElementValue(int offset) {
int currentOffset = offset;
int tag = u1At(currentOffset);
currentOffset++;
switch (tag) {
case 'Z':
if ((this.standardAnnotationTagBits & TagBits.AnnotationDeprecated) != 0) {
// assume member_name is 'since', because @Deprecated has only one boolean member
int constantOffset = this.constantPoolOffsets[u2At(currentOffset)] - this.structOffset + 1;
if (i4At(constantOffset) == 1) {
this.standardAnnotationTagBits |= TagBits.AnnotationTerminallyDeprecated;
}
}
currentOffset += 2;
break;
case 'B':
case 'C':
case 'D':
case 'F':
case 'I':
case 'J':
case 'S':
case 's':
case 'c':
currentOffset += 2;
break;
case 'e':
currentOffset += 4;
break;
case '@':
// none of the supported standard annotation are in the nested
// level.
currentOffset = scanAnnotation(currentOffset, false, false);
break;
case '[':
int numberOfValues = u2At(currentOffset);
currentOffset += 2;
for (int i = 0; i < numberOfValues; i++)
currentOffset = scanElementValue(currentOffset);
break;
default:
throw new IllegalStateException();
}
return currentOffset;
}
@Override
public String toString() {
return BinaryTypeFormatter.annotationToString(this);
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + Util.hashCode(this.pairs);
result = prime * result + CharOperation.hashCode(this.typename);
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (getClass() != obj.getClass()) {
return false;
}
AnnotationInfo other = (AnnotationInfo) obj;
if (!Arrays.equals(this.pairs, other.pairs)) {
return false;
}
if (!Arrays.equals(this.typename, other.typename)) {
return false;
}
return true;
}
}