| /******************************************************************************* |
| * Copyright (c) 2000, 2005 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.codegen.ConstantPool; |
| import org.eclipse.jdt.internal.compiler.env.IBinaryField; |
| import org.eclipse.jdt.internal.compiler.impl.BooleanConstant; |
| import org.eclipse.jdt.internal.compiler.impl.ByteConstant; |
| import org.eclipse.jdt.internal.compiler.impl.CharConstant; |
| import org.eclipse.jdt.internal.compiler.impl.Constant; |
| import org.eclipse.jdt.internal.compiler.impl.DoubleConstant; |
| import org.eclipse.jdt.internal.compiler.impl.FloatConstant; |
| import org.eclipse.jdt.internal.compiler.impl.IntConstant; |
| import org.eclipse.jdt.internal.compiler.impl.LongConstant; |
| import org.eclipse.jdt.internal.compiler.impl.ShortConstant; |
| import org.eclipse.jdt.internal.compiler.impl.StringConstant; |
| import org.eclipse.jdt.internal.compiler.lookup.TagBits; |
| import org.eclipse.jdt.internal.compiler.lookup.TypeIds; |
| import org.eclipse.jdt.internal.compiler.util.Util; |
| |
| public class FieldInfo extends ClassFileStruct implements AttributeNamesConstants, IBinaryField, Comparable, TypeIds { |
| private int accessFlags; |
| private int attributeBytes; |
| private Constant constant; |
| private int[] constantPoolOffsets; |
| private char[] descriptor; |
| private char[] name; |
| private char[] signature; |
| private int signatureUtf8Offset; |
| private long tagBits; |
| private Object wrappedConstantValue; |
| /** |
| * @param classFileBytes byte[] |
| * @param offsets int[] |
| * @param offset int |
| */ |
| public FieldInfo (byte classFileBytes[], int offsets[], int offset) { |
| super(classFileBytes, offset); |
| constantPoolOffsets = offsets; |
| accessFlags = -1; |
| int attributesCount = u2At(6); |
| int readOffset = 8; |
| this.signatureUtf8Offset = -1; |
| for (int i = 0; i < attributesCount; i++) { |
| // check the name of each attribute |
| int utf8Offset = constantPoolOffsets[u2At(readOffset)] - 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 = constantPoolOffsets[u2At(readOffset + 6)] - structOffset; |
| } |
| break; |
| case 'R' : |
| if (CharOperation.equals(attributeName, RuntimeVisibleAnnotationsName)) { |
| decodeStandardAnnotations(readOffset); |
| } |
| } |
| } |
| readOffset += (6 + u4At(readOffset + 2)); |
| } |
| attributeBytes = readOffset; |
| } |
| |
| public int compareTo(Object o) { |
| if (!(o instanceof FieldInfo)) { |
| throw new ClassCastException(); |
| } |
| return new String(this.getName()).compareTo(new String(((FieldInfo) o).getName())); |
| } |
| private int decodeAnnotation(int offset) { |
| int readOffset = offset; |
| int utf8Offset = this.constantPoolOffsets[u2At(offset)] - structOffset; |
| char[] typeName = utf8At(utf8Offset + 3, u2At(utf8Offset + 1)); |
| int numberOfPairs = u2At(offset + 2); |
| readOffset += 4; |
| if (typeName.length == 22 && CharOperation.equals(typeName, ConstantPool.JAVA_LANG_DEPRECATED)) { |
| this.tagBits |= TagBits.AnnotationDeprecated; |
| return readOffset; |
| } |
| for (int i = 0; i < numberOfPairs; i++) { |
| readOffset += 2; |
| readOffset = decodeElementValue(readOffset); |
| } |
| return readOffset; |
| } |
| private int decodeElementValue(int offset) { |
| int readOffset = offset; |
| int tag = u1At(readOffset); |
| readOffset++; |
| switch(tag) { |
| case 'B' : |
| case 'C' : |
| case 'D' : |
| case 'F' : |
| case 'I' : |
| case 'J' : |
| case 'S' : |
| case 'Z' : |
| case 's' : |
| readOffset += 2; |
| break; |
| case 'e' : |
| readOffset += 4; |
| break; |
| case 'c' : |
| readOffset += 2; |
| break; |
| case '@' : |
| readOffset += decodeAnnotation(readOffset); |
| break; |
| case '[' : |
| int numberOfValues = u2At(readOffset); |
| readOffset += 2; |
| for (int i = 0; i < numberOfValues; i++) { |
| readOffset = decodeElementValue(readOffset); |
| } |
| break; |
| } |
| return readOffset; |
| } |
| /** |
| * @param offset the offset is located at the beginning of the runtime visible |
| * annotation attribute. |
| */ |
| private void decodeStandardAnnotations(int offset) { |
| int numberOfAnnotations = u2At(offset + 6); |
| int readOffset = offset + 8; |
| for (int i = 0; i < numberOfAnnotations; i++) { |
| readOffset = decodeAnnotation(readOffset); |
| } |
| } |
| /** |
| * 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 (constant == null) { |
| // read constant |
| readConstantAttribute(); |
| } |
| return 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 (name == null) { |
| // read the name |
| int utf8Offset = constantPoolOffsets[u2At(2)] - structOffset; |
| name = utf8At(utf8Offset + 3, u2At(utf8Offset + 1)); |
| } |
| return 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 (descriptor == null) { |
| // read the signature |
| int utf8Offset = constantPoolOffsets[u2At(4)] - structOffset; |
| descriptor = utf8At(utf8Offset + 3, u2At(utf8Offset + 1)); |
| } |
| return descriptor; |
| } |
| /** |
| * 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 T_int : |
| this.wrappedConstantValue = new Integer(fieldConstant.intValue()); |
| break; |
| case T_byte : |
| this.wrappedConstantValue = new Byte(fieldConstant.byteValue()); |
| break; |
| case T_short : |
| this.wrappedConstantValue = new Short(fieldConstant.shortValue()); |
| break; |
| case T_char : |
| this.wrappedConstantValue = new Character(fieldConstant.charValue()); |
| break; |
| case T_float : |
| this.wrappedConstantValue = new Float(fieldConstant.floatValue()); |
| break; |
| case T_double : |
| this.wrappedConstantValue = new Double(fieldConstant.doubleValue()); |
| break; |
| case T_boolean : |
| this.wrappedConstantValue = Util.toBoolean(fieldConstant.booleanValue()); |
| break; |
| case T_long : |
| this.wrappedConstantValue = new Long(fieldConstant.longValue()); |
| break; |
| case 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. |
| */ |
| 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() & AccSynthetic) != 0; |
| } |
| |
| private void readConstantAttribute() { |
| int attributesCount = u2At(6); |
| int readOffset = 8; |
| boolean isConstant = false; |
| for (int i = 0; i < attributesCount; i++) { |
| int utf8Offset = constantPoolOffsets[u2At(readOffset)] - structOffset; |
| char[] attributeName = utf8At(utf8Offset + 3, u2At(utf8Offset + 1)); |
| if (CharOperation |
| .equals(attributeName, ConstantValueName)) { |
| isConstant = true; |
| // read the right constant |
| int relativeOffset = constantPoolOffsets[u2At(readOffset + 6)] - structOffset; |
| switch (u1At(relativeOffset)) { |
| case IntegerTag : |
| char[] sign = getTypeName(); |
| if (sign.length == 1) { |
| switch (sign[0]) { |
| case 'Z' : // boolean constant |
| constant = new BooleanConstant(i4At(relativeOffset + 1) == 1); |
| break; |
| case 'I' : // integer constant |
| constant = new IntConstant(i4At(relativeOffset + 1)); |
| break; |
| case 'C' : // char constant |
| constant = new CharConstant((char) i4At(relativeOffset + 1)); |
| break; |
| case 'B' : // byte constant |
| constant = new ByteConstant((byte) i4At(relativeOffset + 1)); |
| break; |
| case 'S' : // short constant |
| constant = new ShortConstant((short) i4At(relativeOffset + 1)); |
| break; |
| default: |
| constant = Constant.NotAConstant; |
| } |
| } else { |
| constant = Constant.NotAConstant; |
| } |
| break; |
| case FloatTag : |
| constant = new FloatConstant(floatAt(relativeOffset + 1)); |
| break; |
| case DoubleTag : |
| constant = new DoubleConstant(doubleAt(relativeOffset + 1)); |
| break; |
| case LongTag : |
| constant = new LongConstant(i8At(relativeOffset + 1)); |
| break; |
| case StringTag : |
| utf8Offset = constantPoolOffsets[u2At(relativeOffset + 1)] - structOffset; |
| constant = |
| new StringConstant( |
| String.valueOf(utf8At(utf8Offset + 3, u2At(utf8Offset + 1)))); |
| break; |
| } |
| } |
| readOffset += (6 + u4At(readOffset + 2)); |
| } |
| if (!isConstant) { |
| constant = Constant.NotAConstant; |
| } |
| } |
| private void readModifierRelatedAttributes() { |
| int attributesCount = u2At(6); |
| int readOffset = 8; |
| for (int i = 0; i < attributesCount; i++) { |
| int utf8Offset = constantPoolOffsets[u2At(readOffset)] - 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, DeprecatedName)) |
| this.accessFlags |= AccDeprecated; |
| break; |
| case 'S' : |
| if (CharOperation.equals(attributeName, SyntheticName)) |
| this.accessFlags |= AccSynthetic; |
| break; |
| } |
| } |
| readOffset += (6 + u4At(readOffset + 2)); |
| } |
| } |
| protected void reset() { |
| this.constantPoolOffsets = null; |
| super.reset(); |
| } |
| /** |
| * Answer the size of the receiver in bytes. |
| * |
| * @return int |
| */ |
| public int sizeInBytes() { |
| return attributeBytes; |
| } |
| public void throwFormatException() throws ClassFormatException { |
| throw new ClassFormatException(ClassFormatException.ErrBadFieldInfo); |
| } |
| public String toString() { |
| StringBuffer buffer = new StringBuffer(this.getClass().getName()); |
| int modifiers = getModifiers(); |
| return buffer |
| .append("{") //$NON-NLS-1$ |
| .append( |
| ((modifiers & AccDeprecated) != 0 ? "deprecated " : "") //$NON-NLS-1$ //$NON-NLS-2$ |
| + ((modifiers & 0x0001) == 1 ? "public " : "") //$NON-NLS-1$ //$NON-NLS-2$ |
| + ((modifiers & 0x0002) == 0x0002 ? "private " : "") //$NON-NLS-1$ //$NON-NLS-2$ |
| + ((modifiers & 0x0004) == 0x0004 ? "protected " : "") //$NON-NLS-1$ //$NON-NLS-2$ |
| + ((modifiers & 0x0008) == 0x000008 ? "static " : "") //$NON-NLS-1$ //$NON-NLS-2$ |
| + ((modifiers & 0x0010) == 0x0010 ? "final " : "") //$NON-NLS-1$ //$NON-NLS-2$ |
| + ((modifiers & 0x0040) == 0x0040 ? "volatile " : "") //$NON-NLS-1$ //$NON-NLS-2$ |
| + ((modifiers & 0x0080) == 0x0080 ? "transient " : "")) //$NON-NLS-1$ //$NON-NLS-2$ |
| .append(getTypeName()) |
| .append(" ") //$NON-NLS-1$ |
| .append(getName()) |
| .append(" ") //$NON-NLS-1$ |
| .append(getConstant()) |
| .append("}") //$NON-NLS-1$ |
| .toString(); |
| } |
| |
| } |
