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org.eclipse.jdt.internal.compiler.classfmt.MethodInfo Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2000, 2018 IBM Corporation and others.
*
* 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:
* IBM Corporation - initial API and implementation
* Stephan Herrmann - Contribution for bug 186342 - [compiler][null] Using annotations for null checking
* Jesper Steen Moeller - Contribution for bug 406973 - [compiler] Parse MethodParameters attribute
* Andy Clement (GoPivotal, Inc) [email protected] - Contributions for
* Bug 407191 - [1.8] Binary access support for type annotations
*******************************************************************************/
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.IBinaryAnnotation;
import org.eclipse.jdt.internal.compiler.env.IBinaryMethod;
import org.eclipse.jdt.internal.compiler.env.IBinaryTypeAnnotation;
import org.eclipse.jdt.internal.compiler.lookup.TagBits;
import org.eclipse.jdt.internal.compiler.util.CharDeduplication;
@SuppressWarnings("rawtypes")
public class MethodInfo extends ClassFileStruct implements IBinaryMethod, Comparable {
static private final char[] ARG = "arg".toCharArray(); //$NON-NLS-1$
protected int accessFlags;
protected int attributeBytes;
protected char[] descriptor;
protected volatile char[][] exceptionNames;
protected char[] name;
protected char[] signature;
protected int signatureUtf8Offset;
protected long tagBits;
protected volatile char[][] argumentNames;
protected long version;
public static MethodInfo createMethod(byte classFileBytes[], int offsets[], int offset, long version) {
MethodInfo methodInfo = new MethodInfo(classFileBytes, offsets, offset, version);
int attributesCount = methodInfo.u2At(6);
int readOffset = 8;
AnnotationInfo[] annotations = null;
AnnotationInfo[][] parameterAnnotations = null;
TypeAnnotationInfo[] typeAnnotations = null;
for (int i = 0; i < attributesCount; i++) {
// check the name of each attribute
int utf8Offset = methodInfo.constantPoolOffsets[methodInfo.u2At(readOffset)] - methodInfo.structOffset;
char[] attributeName = methodInfo.utf8At(utf8Offset + 3, methodInfo.u2At(utf8Offset + 1));
if (attributeName.length > 0) {
switch(attributeName[0]) {
case 'M' :
if (CharOperation.equals(attributeName, AttributeNamesConstants.MethodParametersName)) {
methodInfo.decodeMethodParameters(readOffset, methodInfo);
}
break;
case 'S' :
if (CharOperation.equals(AttributeNamesConstants.SignatureName, attributeName))
methodInfo.signatureUtf8Offset = methodInfo.constantPoolOffsets[methodInfo.u2At(readOffset + 6)] - methodInfo.structOffset;
break;
case 'R' :
AnnotationInfo[] methodAnnotations = null;
AnnotationInfo[][] paramAnnotations = null;
TypeAnnotationInfo[] methodTypeAnnotations = null;
if (CharOperation.equals(attributeName, AttributeNamesConstants.RuntimeVisibleAnnotationsName)) {
methodAnnotations = decodeMethodAnnotations(readOffset, true, methodInfo);
} else if (CharOperation.equals(attributeName, AttributeNamesConstants.RuntimeInvisibleAnnotationsName)) {
methodAnnotations = decodeMethodAnnotations(readOffset, false, methodInfo);
} else if (CharOperation.equals(attributeName, AttributeNamesConstants.RuntimeVisibleParameterAnnotationsName)) {
paramAnnotations = decodeParamAnnotations(readOffset, true, methodInfo);
} else if (CharOperation.equals(attributeName, AttributeNamesConstants.RuntimeInvisibleParameterAnnotationsName)) {
paramAnnotations = decodeParamAnnotations(readOffset, false, methodInfo);
} else if (CharOperation.equals(attributeName, AttributeNamesConstants.RuntimeVisibleTypeAnnotationsName)) {
methodTypeAnnotations = decodeTypeAnnotations(readOffset, true, methodInfo);
} else if (CharOperation.equals(attributeName, AttributeNamesConstants.RuntimeInvisibleTypeAnnotationsName)) {
methodTypeAnnotations = decodeTypeAnnotations(readOffset, false, methodInfo);
}
if (methodAnnotations != null) {
if (annotations == null) {
annotations = methodAnnotations;
} else {
int length = annotations.length;
AnnotationInfo[] newAnnotations = new AnnotationInfo[length + methodAnnotations.length];
System.arraycopy(annotations, 0, newAnnotations, 0, length);
System.arraycopy(methodAnnotations, 0, newAnnotations, length, methodAnnotations.length);
annotations = newAnnotations;
}
} else if (paramAnnotations != null) {
int numberOfParameters = paramAnnotations.length;
if (parameterAnnotations == null) {
parameterAnnotations = paramAnnotations;
} else {
for (int p = 0; p < numberOfParameters; p++) {
int numberOfAnnotations = paramAnnotations[p] == null ? 0 : paramAnnotations[p].length;
if (numberOfAnnotations > 0) {
if (parameterAnnotations[p] == null) {
parameterAnnotations[p] = paramAnnotations[p];
} else {
int length = parameterAnnotations[p].length;
AnnotationInfo[] newAnnotations = new AnnotationInfo[length + numberOfAnnotations];
System.arraycopy(parameterAnnotations[p], 0, newAnnotations, 0, length);
System.arraycopy(paramAnnotations[p], 0, newAnnotations, length, numberOfAnnotations);
parameterAnnotations[p] = newAnnotations;
}
}
}
}
} else if (methodTypeAnnotations != null) {
if (typeAnnotations == null) {
typeAnnotations = methodTypeAnnotations;
} else {
int length = typeAnnotations.length;
TypeAnnotationInfo[] newAnnotations = new TypeAnnotationInfo[length + methodTypeAnnotations.length];
System.arraycopy(typeAnnotations, 0, newAnnotations, 0, length);
System.arraycopy(methodTypeAnnotations, 0, newAnnotations, length, methodTypeAnnotations.length);
typeAnnotations = newAnnotations;
}
}
break;
}
}
readOffset += (6 + methodInfo.u4At(readOffset + 2));
}
methodInfo.attributeBytes = readOffset;
if (typeAnnotations != null)
return new MethodInfoWithTypeAnnotations(methodInfo, annotations, parameterAnnotations, typeAnnotations);
if (parameterAnnotations != null)
return new MethodInfoWithParameterAnnotations(methodInfo, annotations, parameterAnnotations);
if (annotations != null)
return new MethodInfoWithAnnotations(methodInfo, annotations);
return methodInfo;
}
static AnnotationInfo[] decodeAnnotations(int offset, boolean runtimeVisible, int numberOfAnnotations, MethodInfo methodInfo) {
AnnotationInfo[] result = new AnnotationInfo[numberOfAnnotations];
int readOffset = offset;
for (int i = 0; i < numberOfAnnotations; i++) {
result[i] = new AnnotationInfo(methodInfo.reference, methodInfo.constantPoolOffsets,
readOffset + methodInfo.structOffset, runtimeVisible, false);
readOffset += result[i].readOffset;
}
return result;
}
static AnnotationInfo[] decodeMethodAnnotations(int offset, boolean runtimeVisible, MethodInfo methodInfo) {
int numberOfAnnotations = methodInfo.u2At(offset + 6);
if (numberOfAnnotations > 0) {
AnnotationInfo[] annos = decodeAnnotations(offset + 8, runtimeVisible, numberOfAnnotations, methodInfo);
if (runtimeVisible){
int numRetainedAnnotations = 0;
for( int i=0; i 0) {
int readOffset = offset + 8;
TypeAnnotationInfo[] typeAnnos = new TypeAnnotationInfo[numberOfAnnotations];
for (int i = 0; i < numberOfAnnotations; i++) {
TypeAnnotationInfo newInfo = new TypeAnnotationInfo(methodInfo.reference, methodInfo.constantPoolOffsets, readOffset + methodInfo.structOffset, runtimeVisible, false);
readOffset += newInfo.readOffset;
typeAnnos[i] = newInfo;
}
return typeAnnos;
}
return null;
}
static AnnotationInfo[][] decodeParamAnnotations(int offset, boolean runtimeVisible, MethodInfo methodInfo) {
AnnotationInfo[][] allParamAnnotations = null;
int numberOfParameters = methodInfo.u1At(offset + 6);
if (numberOfParameters > 0) {
// u2 attribute_name_index + u4 attribute_length + u1 num_parameters
int readOffset = offset + 7;
for (int i=0 ; i < numberOfParameters; i++) {
int numberOfAnnotations = methodInfo.u2At(readOffset);
readOffset += 2;
if (numberOfAnnotations > 0) {
if (allParamAnnotations == null)
allParamAnnotations = new AnnotationInfo[numberOfParameters][];
AnnotationInfo[] annos = decodeAnnotations(readOffset, runtimeVisible, numberOfAnnotations, methodInfo);
allParamAnnotations[i] = annos;
for (AnnotationInfo info : annos)
readOffset += info.readOffset;
}
}
}
return allParamAnnotations;
}
/**
* @param classFileBytes byte[]
* @param offsets int[]
* @param offset int
* @param version class file version
*/
protected MethodInfo (byte classFileBytes[], int offsets[], int offset, long version) {
super(classFileBytes, offsets, offset);
this.accessFlags = -1;
this.signatureUtf8Offset = -1;
this.version = version;
}
@Override
public int compareTo(Object o) {
MethodInfo otherMethod = (MethodInfo) o;
int result = new String(getSelector()).compareTo(new String(otherMethod.getSelector()));
if (result != 0) return result;
return new String(getMethodDescriptor()).compareTo(new String(otherMethod.getMethodDescriptor()));
}
@Override
public boolean equals(Object o) {
if (!(o instanceof MethodInfo)) {
return false;
}
MethodInfo otherMethod = (MethodInfo) o;
return CharOperation.equals(getSelector(), otherMethod.getSelector())
&& CharOperation.equals(getMethodDescriptor(), otherMethod.getMethodDescriptor());
}
@Override
public int hashCode() {
return CharOperation.hashCode(getSelector()) + CharOperation.hashCode(getMethodDescriptor());
}
@Override
public IBinaryAnnotation[] getAnnotations() {
return null;
}
/**
* @see org.eclipse.jdt.internal.compiler.env.IGenericMethod#getArgumentNames()
*/
@Override
public char[][] getArgumentNames() {
if (this.argumentNames == null) {
readCodeAttribute();
}
return this.argumentNames;
}
@Override
public Object getDefaultValue() {
return null;
}
@Override
public char[][] getExceptionTypeNames() {
if (this.exceptionNames == null) {
readExceptionAttributes();
}
return this.exceptionNames;
}
@Override
public char[] getGenericSignature() {
if (this.signatureUtf8Offset != -1) {
if (this.signature == null) {
// decode the signature
this.signature = CharDeduplication.intern(utf8At(this.signatureUtf8Offset + 3, u2At(this.signatureUtf8Offset + 1)));
}
return this.signature;
}
return null;
}
@Override
public char[] getMethodDescriptor() {
if (this.descriptor == null) {
// read the name
int utf8Offset = this.constantPoolOffsets[u2At(4)] - this.structOffset;
this.descriptor = CharDeduplication.intern(utf8At(utf8Offset + 3, u2At(utf8Offset + 1)));
}
return this.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
*/
@Override
public int getModifiers() {
if (this.accessFlags == -1) {
// compute the accessflag. Don't forget the deprecated attribute
readModifierRelatedAttributes();
}
return this.accessFlags;
}
@Override
public IBinaryAnnotation[] getParameterAnnotations(int index, char[] classFileName) {
return null;
}
@Override
public int getAnnotatedParametersCount() {
return 0;
}
@Override
public IBinaryTypeAnnotation[] getTypeAnnotations() {
return null;
}
@Override
public char[] getSelector() {
if (this.name == null) {
// read the name
int utf8Offset = this.constantPoolOffsets[u2At(2)] - this.structOffset;
this.name = CharDeduplication.intern(utf8At(utf8Offset + 3, u2At(utf8Offset + 1)));
}
return this.name;
}
@Override
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.
*/
protected void initialize() {
getModifiers();
getSelector();
getMethodDescriptor();
getExceptionTypeNames();
getGenericSignature();
getArgumentNames();
reset();
}
/**
* Answer true if the method is a class initializer, false otherwise.
* @return boolean
*/
@Override
public boolean isClinit() {
return org.eclipse.jdt.internal.compiler.classfmt.JavaBinaryNames.isClinit(getSelector());
}
/**
* Answer true if the method is a constructor, false otherwise.
* @return boolean
*/
@Override
public boolean isConstructor() {
return org.eclipse.jdt.internal.compiler.classfmt.JavaBinaryNames.isConstructor(getSelector());
}
/**
* Return true if the field is a synthetic method, false otherwise.
* @return boolean
*/
public boolean isSynthetic() {
return (getModifiers() & ClassFileConstants.AccSynthetic) != 0;
}
private synchronized void readExceptionAttributes() {
int attributesCount = u2At(6);
int readOffset = 8;
char[][] names = null;
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.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) {
names = CharOperation.NO_CHAR_CHAR;
} else {
names = new char[entriesNumber][];
for (int j = 0; j < entriesNumber; j++) {
utf8Offset =
this.constantPoolOffsets[u2At(
this.constantPoolOffsets[u2At(readOffset)] - this.structOffset + 1)]
- this.structOffset;
names[j] = utf8At(utf8Offset + 3, u2At(utf8Offset + 1));
readOffset += 2;
}
}
} else {
readOffset += (6 + u4At(readOffset + 2));
}
}
if (names == null) {
this.exceptionNames = CharOperation.NO_CHAR_CHAR;
} else {
this.exceptionNames = names;
}
}
private synchronized void readModifierRelatedAttributes() {
int flags = u2At(0);
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))
flags |= ClassFileConstants.AccDeprecated;
break;
case 'S' :
if (CharOperation.equals(attributeName, AttributeNamesConstants.SyntheticName))
flags |= ClassFileConstants.AccSynthetic;
break;
case 'A' :
if (CharOperation.equals(attributeName, AttributeNamesConstants.AnnotationDefaultName))
flags |= ClassFileConstants.AccAnnotationDefault;
break;
case 'V' :
if (CharOperation.equals(attributeName, AttributeNamesConstants.VarargsName))
flags |= ClassFileConstants.AccVarargs;
}
}
readOffset += (6 + u4At(readOffset + 2));
}
this.accessFlags = flags;
}
/**
* Answer the size of the receiver in bytes.
*
* @return int
*/
public int sizeInBytes() {
return this.attributeBytes;
}
@Override
public String toString() {
StringBuilder buffer = new StringBuilder();
toString(buffer);
return buffer.toString();
}
void toString(StringBuilder buffer) {
buffer.append(getClass().getName());
toStringContent(buffer);
}
protected void toStringContent(StringBuilder buffer) {
BinaryTypeFormatter.methodToStringContent(buffer, this);
}
private synchronized void readCodeAttribute() {
int attributesCount = u2At(6);
int readOffset = 8;
if (attributesCount != 0) {
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.CodeName)) {
decodeCodeAttribute(readOffset);
if (this.argumentNames == null || this.argumentNames.length == 0) {
this.argumentNames = CharOperation.NO_CHAR_CHAR;
}
return;
} else {
readOffset += (6 + u4At(readOffset + 2));
}
}
}
this.argumentNames = CharOperation.NO_CHAR_CHAR;
}
private void decodeCodeAttribute(int offset) {
int readOffset = offset + 10;
int codeLength = (int) u4At(readOffset);
readOffset += (4 + codeLength);
int exceptionTableLength = u2At(readOffset);
readOffset += 2;
if (exceptionTableLength != 0) {
for (int i = 0; i < exceptionTableLength; i++) {
readOffset += 8;
}
}
int attributesCount = u2At(readOffset);
readOffset += 2;
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.LocalVariableTableName)) {
decodeLocalVariableAttribute(readOffset, codeLength);
}
readOffset += (6 + u4At(readOffset + 2));
}
}
private void decodeLocalVariableAttribute(int offset, int codeLength) {
int readOffset = offset + 6;
final int length = u2At(readOffset);
if (length != 0) {
readOffset += 2;
char[][] names = new char[length][];
int argumentNamesIndex = 0;
for (int i = 0; i < length; i++) {
int startPC = u2At(readOffset);
if (startPC == 0) {
int nameIndex = u2At(4 + readOffset);
int utf8Offset = this.constantPoolOffsets[nameIndex] - this.structOffset;
char[] localVariableName = utf8At(utf8Offset + 3, u2At(utf8Offset + 1));
if (!CharOperation.equals(localVariableName, ConstantPool.This)) {
names[argumentNamesIndex++] = CharDeduplication.intern(localVariableName);
}
} else {
break;
}
readOffset += 10;
}
if (argumentNamesIndex != names.length) {
// resize
System.arraycopy(names, 0, (names = new char[argumentNamesIndex][]), 0, argumentNamesIndex);
}
this.argumentNames = names;
}
}
private void decodeMethodParameters(int offset, MethodInfo methodInfo) {
int readOffset = offset + 6;
final int length = u1At(readOffset);
if (length != 0) {
readOffset += 1;
char[][] names = new char[length][];
for (int i = 0; i < length; i++) {
int nameIndex = u2At(readOffset);
if (nameIndex != 0) {
int utf8Offset = this.constantPoolOffsets[nameIndex] - this.structOffset;
char[] parameterName = utf8At(utf8Offset + 3, u2At(utf8Offset + 1));
names[i] = CharDeduplication.intern(parameterName);
} else {
names[i] = CharOperation.concat(ARG, String.valueOf(i).toCharArray());
}
readOffset += 4;
}
this.argumentNames = names;
}
}
}
