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org.eclipse.jdt.internal.compiler.classfmt.FieldInfo Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2000, 2008 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.jdt.internal.compiler.classfmt;
import org.eclipse.jdt.core.compiler.CharOperation;
import org.eclipse.jdt.internal.compiler.codegen.AttributeNamesConstants;
import org.eclipse.jdt.internal.compiler.env.IBinaryAnnotation;
import org.eclipse.jdt.internal.compiler.env.IBinaryField;
import org.eclipse.jdt.internal.compiler.impl.*;
import org.eclipse.jdt.internal.compiler.lookup.TypeIds;
import org.eclipse.jdt.internal.compiler.util.Util;
public class FieldInfo extends ClassFileStruct implements IBinaryField, Comparable {
protected int accessFlags;
protected int attributeBytes;
protected Constant constant;
protected char[] descriptor;
protected char[] name;
protected char[] signature;
protected int signatureUtf8Offset;
protected long tagBits;
protected Object wrappedConstantValue;
public static FieldInfo createField(byte classFileBytes[], int offsets[], int offset) {
FieldInfo fieldInfo = new FieldInfo(classFileBytes, offsets, offset);
AnnotationInfo[] annotations = fieldInfo.readAttributes();
if (annotations == null)
return fieldInfo;
return new FieldInfoWithAnnotation(fieldInfo, annotations);
}
/**
* @param classFileBytes byte[]
* @param offsets int[]
* @param offset int
*/
protected FieldInfo (byte classFileBytes[], int offsets[], int offset) {
super(classFileBytes, offsets, offset);
this.accessFlags = -1;
this.signatureUtf8Offset = -1;
}
private AnnotationInfo[] decodeAnnotations(int offset, boolean runtimeVisible) {
int numberOfAnnotations = u2At(offset + 6);
if (numberOfAnnotations > 0) {
int readOffset = offset + 8;
AnnotationInfo[] newInfos = null;
int newInfoCount = 0;
for (int i = 0; i < numberOfAnnotations; i++) {
// With the last parameter being 'false', the data structure will not be flushed out
AnnotationInfo newInfo = new AnnotationInfo(this.reference, this.constantPoolOffsets,
readOffset + this.structOffset, runtimeVisible, false);
readOffset += newInfo.readOffset;
long standardTagBits = newInfo.standardAnnotationTagBits;
if (standardTagBits != 0) {
this.tagBits |= standardTagBits;
} else {
if (newInfos == null)
newInfos = new AnnotationInfo[numberOfAnnotations - i];
newInfos[newInfoCount++] = newInfo;
}
}
if (newInfos != null) {
if (newInfoCount != newInfos.length)
System.arraycopy(newInfos, 0, newInfos = new AnnotationInfo[newInfoCount], 0, newInfoCount);
return newInfos;
}
}
return null; // nothing to record
}
public int compareTo(Object o) {
return new String(getName()).compareTo(new String(((FieldInfo) o).getName()));
}
public boolean equals(Object o) {
if (!(o instanceof FieldInfo)) {
return false;
}
return CharOperation.equals(getName(), ((FieldInfo) o).getName());
}
public int hashCode() {
return CharOperation.hashCode(getName());
}
/**
* Return the constant of the field.
* Return org.eclipse.jdt.internal.compiler.impl.Constant.NotAConstant if there is none.
* @return org.eclipse.jdt.internal.compiler.impl.Constant
*/
public Constant getConstant() {
if (this.constant == null) {
// read constant
readConstantAttribute();
}
return this.constant;
}
public char[] getGenericSignature() {
if (this.signatureUtf8Offset != -1) {
if (this.signature == null) {
// decode the signature
this.signature = utf8At(this.signatureUtf8Offset + 3, u2At(this.signatureUtf8Offset + 1));
}
return this.signature;
}
return null;
}
/**
* Answer an int whose bits are set according the access constants
* defined by the VM spec.
* Set the AccDeprecated and AccSynthetic bits if necessary
* @return int
*/
public int getModifiers() {
if (this.accessFlags == -1) {
// compute the accessflag. Don't forget the deprecated attribute
this.accessFlags = u2At(0);
readModifierRelatedAttributes();
}
return this.accessFlags;
}
/**
* Answer the name of the field.
* @return char[]
*/
public char[] getName() {
if (this.name == null) {
// read the name
int utf8Offset = this.constantPoolOffsets[u2At(2)] - this.structOffset;
this.name = utf8At(utf8Offset + 3, u2At(utf8Offset + 1));
}
return this.name;
}
public long getTagBits() {
return this.tagBits;
}
/**
* Answer the resolved name of the receiver's type in the
* class file format as specified in section 4.3.2 of the Java 2 VM spec.
*
* For example:
* - java.lang.String is Ljava/lang/String;
* - an int is I
* - a 2 dimensional array of strings is [[Ljava/lang/String;
* - an array of floats is [F
* @return char[]
*/
public char[] getTypeName() {
if (this.descriptor == null) {
// read the signature
int utf8Offset = this.constantPoolOffsets[u2At(4)] - this.structOffset;
this.descriptor = utf8At(utf8Offset + 3, u2At(utf8Offset + 1));
}
return this.descriptor;
}
/**
* @return the annotations or null if there is none.
*/
public IBinaryAnnotation[] getAnnotations() {
return null;
}
/**
* Return a wrapper that contains the constant of the field.
* @return java.lang.Object
*/
public Object getWrappedConstantValue() {
if (this.wrappedConstantValue == null) {
if (hasConstant()) {
Constant fieldConstant = getConstant();
switch (fieldConstant.typeID()) {
case TypeIds.T_int :
this.wrappedConstantValue = new Integer(fieldConstant.intValue());
break;
case TypeIds.T_byte :
this.wrappedConstantValue = new Byte(fieldConstant.byteValue());
break;
case TypeIds.T_short :
this.wrappedConstantValue = new Short(fieldConstant.shortValue());
break;
case TypeIds.T_char :
this.wrappedConstantValue = new Character(fieldConstant.charValue());
break;
case TypeIds.T_float :
this.wrappedConstantValue = new Float(fieldConstant.floatValue());
break;
case TypeIds.T_double :
this.wrappedConstantValue = new Double(fieldConstant.doubleValue());
break;
case TypeIds.T_boolean :
this.wrappedConstantValue = Util.toBoolean(fieldConstant.booleanValue());
break;
case TypeIds.T_long :
this.wrappedConstantValue = new Long(fieldConstant.longValue());
break;
case TypeIds.T_JavaLangString :
this.wrappedConstantValue = fieldConstant.stringValue();
}
}
}
return this.wrappedConstantValue;
}
/**
* Return true if the field has a constant value attribute, false otherwise.
* @return boolean
*/
public boolean hasConstant() {
return getConstant() != Constant.NotAConstant;
}
/**
* This method is used to fully initialize the contents of the receiver. All methodinfos, fields infos
* will be therefore fully initialized and we can get rid of the bytes.
*/
protected void initialize() {
getModifiers();
getName();
getConstant();
getTypeName();
getGenericSignature();
reset();
}
/**
* Return true if the field is a synthetic field, false otherwise.
* @return boolean
*/
public boolean isSynthetic() {
return (getModifiers() & ClassFileConstants.AccSynthetic) != 0;
}
private AnnotationInfo[] readAttributes() {
int attributesCount = u2At(6);
int readOffset = 8;
AnnotationInfo[] annotations = null;
for (int i = 0; i < attributesCount; i++) {
// check the name of each attribute
int utf8Offset = this.constantPoolOffsets[u2At(readOffset)] - this.structOffset;
char[] attributeName = utf8At(utf8Offset + 3, u2At(utf8Offset + 1));
if (attributeName.length > 0) {
switch(attributeName[0]) {
case 'S' :
if (CharOperation.equals(AttributeNamesConstants.SignatureName, attributeName))
this.signatureUtf8Offset = this.constantPoolOffsets[u2At(readOffset + 6)] - this.structOffset;
break;
case 'R' :
AnnotationInfo[] decodedAnnotations = null;
if (CharOperation.equals(attributeName, AttributeNamesConstants.RuntimeVisibleAnnotationsName)) {
decodedAnnotations = decodeAnnotations(readOffset, true);
} else if (CharOperation.equals(attributeName, AttributeNamesConstants.RuntimeInvisibleAnnotationsName)) {
decodedAnnotations = decodeAnnotations(readOffset, false);
}
if (decodedAnnotations != null) {
if (annotations == null) {
annotations = decodedAnnotations;
} else {
int length = annotations.length;
AnnotationInfo[] combined = new AnnotationInfo[length + decodedAnnotations.length];
System.arraycopy(annotations, 0, combined, 0, length);
System.arraycopy(decodedAnnotations, 0, combined, length, decodedAnnotations.length);
annotations = combined;
}
}
}
}
readOffset += (6 + u4At(readOffset + 2));
}
this.attributeBytes = readOffset;
return annotations;
}
private void readConstantAttribute() {
int attributesCount = u2At(6);
int readOffset = 8;
boolean isConstant = false;
for (int i = 0; i < attributesCount; i++) {
int utf8Offset = this.constantPoolOffsets[u2At(readOffset)] - this.structOffset;
char[] attributeName = utf8At(utf8Offset + 3, u2At(utf8Offset + 1));
if (CharOperation
.equals(attributeName, AttributeNamesConstants.ConstantValueName)) {
isConstant = true;
// read the right constant
int relativeOffset = this.constantPoolOffsets[u2At(readOffset + 6)] - this.structOffset;
switch (u1At(relativeOffset)) {
case ClassFileConstants.IntegerTag :
char[] sign = getTypeName();
if (sign.length == 1) {
switch (sign[0]) {
case 'Z' : // boolean constant
this.constant = BooleanConstant.fromValue(i4At(relativeOffset + 1) == 1);
break;
case 'I' : // integer constant
this.constant = IntConstant.fromValue(i4At(relativeOffset + 1));
break;
case 'C' : // char constant
this.constant = CharConstant.fromValue((char) i4At(relativeOffset + 1));
break;
case 'B' : // byte constant
this.constant = ByteConstant.fromValue((byte) i4At(relativeOffset + 1));
break;
case 'S' : // short constant
this.constant = ShortConstant.fromValue((short) i4At(relativeOffset + 1));
break;
default:
this.constant = Constant.NotAConstant;
}
} else {
this.constant = Constant.NotAConstant;
}
break;
case ClassFileConstants.FloatTag :
this.constant = FloatConstant.fromValue(floatAt(relativeOffset + 1));
break;
case ClassFileConstants.DoubleTag :
this.constant = DoubleConstant.fromValue(doubleAt(relativeOffset + 1));
break;
case ClassFileConstants.LongTag :
this.constant = LongConstant.fromValue(i8At(relativeOffset + 1));
break;
case ClassFileConstants.StringTag :
utf8Offset = this.constantPoolOffsets[u2At(relativeOffset + 1)] - this.structOffset;
this.constant =
StringConstant.fromValue(
String.valueOf(utf8At(utf8Offset + 3, u2At(utf8Offset + 1))));
break;
}
}
readOffset += (6 + u4At(readOffset + 2));
}
if (!isConstant) {
this.constant = Constant.NotAConstant;
}
}
private void readModifierRelatedAttributes() {
int attributesCount = u2At(6);
int readOffset = 8;
for (int i = 0; i < attributesCount; i++) {
int utf8Offset = this.constantPoolOffsets[u2At(readOffset)] - this.structOffset;
char[] attributeName = utf8At(utf8Offset + 3, u2At(utf8Offset + 1));
// test added for obfuscated .class file. See 79772
if (attributeName.length != 0) {
switch(attributeName[0]) {
case 'D' :
if (CharOperation.equals(attributeName, AttributeNamesConstants.DeprecatedName))
this.accessFlags |= ClassFileConstants.AccDeprecated;
break;
case 'S' :
if (CharOperation.equals(attributeName, AttributeNamesConstants.SyntheticName))
this.accessFlags |= ClassFileConstants.AccSynthetic;
break;
}
}
readOffset += (6 + u4At(readOffset + 2));
}
}
/**
* Answer the size of the receiver in bytes.
*
* @return int
*/
public int sizeInBytes() {
return this.attributeBytes;
}
public void throwFormatException() throws ClassFormatException {
throw new ClassFormatException(ClassFormatException.ErrBadFieldInfo);
}
public String toString() {
StringBuffer buffer = new StringBuffer(getClass().getName());
toStringContent(buffer);
return buffer.toString();
}
protected void toStringContent(StringBuffer buffer) {
int modifiers = getModifiers();
buffer
.append('{')
.append(
((modifiers & ClassFileConstants.AccDeprecated) != 0 ? "deprecated " : Util.EMPTY_STRING) //$NON-NLS-1$
+ ((modifiers & 0x0001) == 1 ? "public " : Util.EMPTY_STRING) //$NON-NLS-1$
+ ((modifiers & 0x0002) == 0x0002 ? "private " : Util.EMPTY_STRING) //$NON-NLS-1$
+ ((modifiers & 0x0004) == 0x0004 ? "protected " : Util.EMPTY_STRING) //$NON-NLS-1$
+ ((modifiers & 0x0008) == 0x000008 ? "static " : Util.EMPTY_STRING) //$NON-NLS-1$
+ ((modifiers & 0x0010) == 0x0010 ? "final " : Util.EMPTY_STRING) //$NON-NLS-1$
+ ((modifiers & 0x0040) == 0x0040 ? "volatile " : Util.EMPTY_STRING) //$NON-NLS-1$
+ ((modifiers & 0x0080) == 0x0080 ? "transient " : Util.EMPTY_STRING)) //$NON-NLS-1$
.append(getTypeName())
.append(' ')
.append(getName())
.append(' ')
.append(getConstant())
.append('}')
.toString();
}
}
