| /******************************************************************************* |
| * 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.IBinaryMethod; |
| import org.eclipse.jdt.internal.compiler.lookup.TagBits; |
| |
| public class MethodInfo extends ClassFileStruct implements IBinaryMethod, AttributeNamesConstants, Comparable { |
| static private final char[][] noException = CharOperation.NO_CHAR_CHAR; |
| private int accessFlags; |
| private int attributeBytes; |
| private int[] constantPoolOffsets; |
| private char[] descriptor; |
| private char[][] exceptionNames; |
| private char[] name; |
| private char[] signature; |
| private int signatureUtf8Offset; |
| private long tagBits; |
| |
| /** |
| * @param classFileBytes byte[] |
| * @param offsets int[] |
| * @param offset int |
| */ |
| public MethodInfo (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 MethodInfo)) { |
| throw new ClassCastException(); |
| } |
| |
| MethodInfo otherMethod = (MethodInfo) o; |
| int result = new String(this.getSelector()).compareTo(new String(otherMethod.getSelector())); |
| if (result != 0) return result; |
| return new String(this.getMethodDescriptor()).compareTo(new String(otherMethod.getMethodDescriptor())); |
| } |
| 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); |
| } |
| } |
| /** |
| * @see org.eclipse.jdt.internal.compiler.env.IGenericMethod#getArgumentNames() |
| */ |
| public char[][] getArgumentNames() { |
| return null; |
| } |
| /** |
| * Answer the resolved names of the exception types in the |
| * class file format as specified in section 4.2 of the Java 2 VM spec |
| * or null if the array is empty. |
| * |
| * For example, java.lang.String is java/lang/String. |
| * @return char[][] |
| */ |
| public char[][] getExceptionTypeNames() { |
| if (exceptionNames == null) { |
| readExceptionAttributes(); |
| } |
| return exceptionNames; |
| } |
| 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 the receiver's method descriptor which describes the parameter & |
| * return types as specified in section 4.3.3 of the Java 2 VM spec. |
| * |
| * For example: |
| * - int foo(String) is (Ljava/lang/String;)I |
| * - void foo(Object[]) is (I)[Ljava/lang/Object; |
| * @return char[] |
| */ |
| public char[] getMethodDescriptor() { |
| if (descriptor == null) { |
| // read the name |
| int utf8Offset = constantPoolOffsets[u2At(4)] - structOffset; |
| descriptor = utf8At(utf8Offset + 3, u2At(utf8Offset + 1)); |
| } |
| return descriptor; |
| } |
| /** |
| * 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 method. |
| * |
| * For a constructor, answer <init> & <clinit> for a clinit method. |
| * @return char[] |
| */ |
| public char[] getSelector() { |
| 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; |
| } |
| /** |
| * 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(); |
| getSelector(); |
| getMethodDescriptor(); |
| getExceptionTypeNames(); |
| getGenericSignature(); |
| reset(); |
| } |
| /** |
| * Answer true if the method is a class initializer, false otherwise. |
| * @return boolean |
| */ |
| public boolean isClinit() { |
| char[] selector = getSelector(); |
| return selector[0] == '<' && selector.length == 8; // Can only match <clinit> |
| } |
| /** |
| * Answer true if the method is a constructor, false otherwise. |
| * @return boolean |
| */ |
| public boolean isConstructor() { |
| char[] selector = getSelector(); |
| return selector[0] == '<' && selector.length == 6; // Can only match <init> |
| } |
| /** |
| * Return true if the field is a synthetic method, false otherwise. |
| * @return boolean |
| */ |
| public boolean isSynthetic() { |
| return (getModifiers() & AccSynthetic) != 0; |
| } |
| private void readExceptionAttributes() { |
| 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)); |
| if (CharOperation.equals(attributeName, ExceptionsName)) { |
| // read the number of exception entries |
| int entriesNumber = u2At(readOffset + 6); |
| // place the readOffset at the beginning of the exceptions table |
| readOffset += 8; |
| if (entriesNumber == 0) { |
| exceptionNames = noException; |
| } else { |
| exceptionNames = new char[entriesNumber][]; |
| for (int j = 0; j < entriesNumber; j++) { |
| utf8Offset = |
| constantPoolOffsets[u2At( |
| constantPoolOffsets[u2At(readOffset)] - structOffset + 1)] |
| - structOffset; |
| exceptionNames[j] = utf8At(utf8Offset + 3, u2At(utf8Offset + 1)); |
| readOffset += 2; |
| } |
| } |
| } else { |
| readOffset += (6 + u4At(readOffset + 2)); |
| } |
| } |
| if (exceptionNames == null) { |
| exceptionNames = noException; |
| } |
| } |
| 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; |
| case 'A' : |
| if (CharOperation.equals(attributeName, AnnotationDefaultName)) |
| this.accessFlags |= AccAnnotationDefault; |
| 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 String toString() { |
| int modifiers = getModifiers(); |
| char[] desc = getGenericSignature(); |
| if (desc == null) |
| desc = getMethodDescriptor(); |
| StringBuffer buffer = new StringBuffer(this.getClass().getName()); |
| 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 ? "varargs " : "")) //$NON-NLS-1$ //$NON-NLS-2$ |
| .append(getSelector()) |
| .append(desc) |
| .append("}") //$NON-NLS-1$ |
| .toString(); |
| } |
| } |