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/*
* Copyright 2017-2011 original authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.micronaut.ast.groovy.scan;
import groovyjarjarasm.asm.AnnotationVisitor;
import groovyjarjarasm.asm.ClassVisitor;
import groovyjarjarasm.asm.Handle;
import groovyjarjarasm.asm.Label;
import groovyjarjarasm.asm.Opcodes;
import groovyjarjarasm.asm.Type;
import io.micronaut.core.annotation.Internal;
import java.io.IOException;
import java.io.InputStream;
/**
* A limited class parser that parses the class-level annotations for each class only.
* This class parses a byte array conforming to the Java class file format and
* calls the appropriate visit methods of a given class visitor for each field,
* method and bytecode instruction encountered.
*
* @author Eric Bruneton
* @author Eugene Kuleshov
* @author Graeme Rocher
*/
@SuppressWarnings("MagicNumber")
@Internal
class AnnotationClassReader {
/**
* Flag to skip the debug information in the class. If this flag is set the
* debug information of the class is not visited, i.e. the
* {@link groovyjarjarasm.asm.MethodVisitor#visitLocalVariable visitLocalVariable} and
* {@link groovyjarjarasm.asm.MethodVisitor#visitLineNumber visitLineNumber} methods will not be
* called.
*/
public static final int SKIP_DEBUG = 2;
/**
* Pseudo access flag to distinguish between the synthetic attribute and the
* synthetic access flag.
*/
static final int ACC_SYNTHETIC_ATTRIBUTE = 0x40000;
/**
* The type of CONSTANT_Class constant pool items.
*/
static final int CLASS = 7;
/**
* The type of CONSTANT_Fieldref constant pool items.
*/
static final int FIELD = 9;
/**
* The type of CONSTANT_Methodref constant pool items.
*/
static final int METH = 10;
/**
* The type of CONSTANT_InterfaceMethodref constant pool items.
*/
static final int IMETH = 11;
/**
* The type of CONSTANT_String constant pool items.
*/
static final int STR = 8;
/**
* The type of CONSTANT_Integer constant pool items.
*/
static final int INT = 3;
/**
* The type of CONSTANT_Float constant pool items.
*/
static final int FLOAT = 4;
/**
* The type of CONSTANT_Long constant pool items.
*/
static final int LONG = 5;
/**
* The type of CONSTANT_Double constant pool items.
*/
static final int DOUBLE = 6;
/**
* The type of CONSTANT_NameAndType constant pool items.
*/
static final int NAME_TYPE = 12;
/**
* The type of CONSTANT_Utf8 constant pool items.
*/
static final int UTF8 = 1;
/**
* The type of CONSTANT_MethodType constant pool items.
*/
static final int MTYPE = 16;
/**
* The type of CONSTANT_MethodHandle constant pool items.
*/
static final int HANDLE = 15;
/**
* The type of CONSTANT_InvokeDynamic constant pool items.
*/
static final int INDY = 18;
/**
* True to enable signatures support.
*/
static final boolean SIGNATURES = true;
/**
* True to enable annotations support.
*/
static final boolean ANNOTATIONS = true;
/**
* Start index of the class header information (access, name...) in
* {@link #b b}.
*/
final int header;
/**
* The class to be parsed. The content of this array must not be
* modified. This field is intended for {@link Attribute} sub classes, and
* is normally not needed by class generators or adapters.
*/
final byte[] b;
/**
* The start index of each constant pool item in {@link #b b}, plus one. The
* one byte offset skips the constant pool item tag that indicates its type.
*/
private final int[] items;
/**
* The String objects corresponding to the CONSTANT_Utf8 items. This cache
* avoids multiple parsing of a given CONSTANT_Utf8 constant pool item,
* which GREATLY improves performances (by a factor 2 to 3). This caching
* strategy could be extended to all constant pool items, but its benefit
* would not be so great for these items (because they are much less
* expensive to parse than CONSTANT_Utf8 items).
*/
private final String[] strings;
/**
* Maximum length of the strings contained in the constant pool of the
* class.
*/
private final int maxStringLength;
// ------------------------------------------------------------------------
// Constructors
// ------------------------------------------------------------------------
/**
* Constructs a new {@link groovyjarjarasm.asm.ClassReader} object.
*
* @param b the bytecode of the class to be read.
*/
private AnnotationClassReader(final byte[] b) {
this(b, 0, b.length);
}
/**
* Constructs a new {@link groovyjarjarasm.asm.ClassReader} object.
*
* @param is an input stream from which to read the class.
* @throws IOException if a problem occurs during reading.
*/
public AnnotationClassReader(final InputStream is) throws IOException {
this(readClass(is, false));
}
/**
* Constructs a new {@link groovyjarjarasm.asm.ClassReader} object.
*
* @param name the binary qualified name of the class to be read.
* @throws IOException if an exception occurs during reading.
*/
public AnnotationClassReader(final String name) throws IOException {
this(readClass(
ClassLoader.getSystemResourceAsStream(name.replace('.', '/')
+ ".class"), true));
}
/**
* Constructs a new {@link groovyjarjarasm.asm.ClassReader} object.
*
* @param b the bytecode of the class to be read.
* @param off the start offset of the class data.
* @param len the length of the class data.
*/
AnnotationClassReader(final byte[] b, final int off, final int len) {
this.b = b;
// checks the class version
/* SPRING PATCH: REMOVED FOR FORWARD COMPATIBILITY WITH JDK 9
if (readShort(off + 6) > Opcodes.V1_8) {
throw new IllegalArgumentException();
}
*/
// parses the constant pool
items = new int[readUnsignedShort(off + 8)];
int n = items.length;
strings = new String[n];
int max = 0;
int index = off + 10;
for (int i = 1; i < n; ++i) {
items[i] = index + 1;
int size;
switch (b[index]) {
case FIELD:
case METH:
case IMETH:
case INT:
case FLOAT:
case NAME_TYPE:
case INDY:
size = 5;
break;
case LONG:
case DOUBLE:
size = 9;
++i;
break;
case UTF8:
size = 3 + readUnsignedShort(index + 1);
if (size > max) {
max = size;
}
break;
case HANDLE:
size = 4;
break;
// case ClassWriter.CLASS:
// case ClassWriter.STR:
// case ClassWriter.MTYPE
default:
size = 3;
break;
}
index += size;
}
maxStringLength = max;
// the class header information starts just after the constant pool
header = index;
}
/**
* Returns the class's access flags (see {@link Opcodes}). This value may
* not reflect Deprecated and Synthetic flags when bytecode is before 1.5
* and those flags are represented by attributes.
*
* @return the class access flags
* @see ClassVisitor#visit(int, int, String, String, String, String[])
*/
public int getAccess() {
return readUnsignedShort(header);
}
/**
* Returns the internal name of the class (see
* {@link Type#getInternalName() getInternalName}).
*
* @return the internal class name
* @see ClassVisitor#visit(int, int, String, String, String, String[])
*/
public String getClassName() {
return readClass(header + 2, new char[maxStringLength]);
}
/**
* Returns the internal of name of the super class (see
* {@link Type#getInternalName() getInternalName}). For interfaces, the
* super class is {@link Object}.
*
* @return the internal name of super class, or {@code null} for
* {@link Object} class.
* @see ClassVisitor#visit(int, int, String, String, String, String[])
*/
public String getSuperName() {
return readClass(header + 4, new char[maxStringLength]);
}
/**
* Returns the internal names of the class's interfaces (see
* {@link Type#getInternalName() getInternalName}).
*
* @return the array of internal names for all implemented interfaces or
* {@code null}.
* @see ClassVisitor#visit(int, int, String, String, String, String[])
*/
public String[] getInterfaces() {
int index = header + 6;
int n = readUnsignedShort(index);
String[] interfaces = new String[n];
if (n > 0) {
char[] buf = new char[maxStringLength];
for (int i = 0; i < n; ++i) {
index += 2;
interfaces[i] = readClass(index, buf);
}
}
return interfaces;
}
/**
* Reads the bytecode of a class.
*
* @param is an input stream from which to read the class.
* @param close true to close the input stream after reading.
* @return the bytecode read from the given input stream.
* @throws IOException if a problem occurs during reading.
*/
private static byte[] readClass(final InputStream is, boolean close)
throws IOException {
if (is == null) {
throw new IOException("Class not found");
}
try {
byte[] b = new byte[is.available()];
int len = 0;
while (true) {
int n = is.read(b, len, b.length - len);
if (n == -1) {
if (len < b.length) {
byte[] c = new byte[len];
System.arraycopy(b, 0, c, 0, len);
b = c;
}
return b;
}
len += n;
if (len == b.length) {
int last = is.read();
if (last < 0) {
return b;
}
byte[] c = new byte[b.length + 1000];
System.arraycopy(b, 0, c, 0, len);
c[len++] = (byte) last;
b = c;
}
}
} finally {
if (close) {
is.close();
}
}
}
// ------------------------------------------------------------------------
// Public methods
// ------------------------------------------------------------------------
/**
* Makes the given visitor visit the Java class of this {@link groovyjarjarasm.asm.ClassReader}
* . This class is the one specified in the constructor (see
* {@link #AnnotationClassReader(byte[]) ClassReader}).
*
* @param classVisitor the visitor that must visit this class.
* @param flags the class access flags
*/
public void accept(final ClassVisitor classVisitor, final int flags) {
accept(classVisitor, new Attribute[0], flags);
}
/**
* Makes the given visitor visit the Java class of this {@link groovyjarjarasm.asm.ClassReader}.
* This class is the one specified in the constructor (see
* {@link #AnnotationClassReader(byte[]) ClassReader}).
*
* @param classVisitor the visitor that must visit this class.
* @param attrs prototypes of the attributes that must be parsed during the
* visit of the class. Any attribute whose type is not equal to
* the type of one the prototypes will not be parsed: its byte
* array value will be passed unchanged to the ClassWriter.
* This may corrupt it if this value contains references to
* the constant pool, or has syntactic or semantic links with a
* class element that has been transformed by a class adapter
* between the reader and the writer.
* @param flags the class access flags
*/
public void accept(final ClassVisitor classVisitor,
final Attribute[] attrs, final int flags) {
int u = header; // current offset in the class file
var c = new char[maxStringLength]; // buffer used to read strings
var context = new Context();
context.attrs = attrs;
context.flags = flags;
context.buffer = c;
// reads the class declaration
int access = readUnsignedShort(u);
String name = readClass(u + 2, c);
String superClass = readClass(u + 4, c);
var interfaces = new String[readUnsignedShort(u + 6)];
u += 8;
for (int i = 0; i < interfaces.length; ++i) {
interfaces[i] = readClass(u, c);
u += 2;
}
// reads the class attributes
String signature = null;
String sourceFile = null;
String sourceDebug = null;
String enclosingOwner = null;
String enclosingName = null;
String enclosingDesc = null;
int anns = 0;
int ianns = 0;
int tanns = 0;
int itanns = 0;
int innerClasses = 0;
Attribute attributes = null;
u = getAttributes();
for (int i = readUnsignedShort(u); i > 0; --i) {
String attrName = readUTF8(u + 2, c);
// tests are sorted in decreasing frequency order
// (based on frequencies observed on typical classes)
if ("SourceFile".equals(attrName)) {
sourceFile = readUTF8(u + 8, c);
} else if ("InnerClasses".equals(attrName)) {
innerClasses = u + 8;
} else if ("EnclosingMethod".equals(attrName)) {
enclosingOwner = readClass(u + 8, c);
int item = readUnsignedShort(u + 10);
if (item != 0) {
enclosingName = readUTF8(items[item], c);
enclosingDesc = readUTF8(items[item] + 2, c);
}
} else if (SIGNATURES && "Signature".equals(attrName)) {
signature = readUTF8(u + 8, c);
} else if (ANNOTATIONS
&& "RuntimeVisibleAnnotations".equals(attrName)) {
anns = u + 8;
} else if (ANNOTATIONS
&& "RuntimeVisibleTypeAnnotations".equals(attrName)) {
tanns = u + 8;
} else if ("Deprecated".equals(attrName)) {
access |= Opcodes.ACC_DEPRECATED;
} else if ("Synthetic".equals(attrName)) {
access |= Opcodes.ACC_SYNTHETIC
| ACC_SYNTHETIC_ATTRIBUTE;
} else if ("SourceDebugExtension".equals(attrName)) {
int len = readInt(u + 4);
sourceDebug = readUTF(u + 8, len, new char[len]);
} else if (ANNOTATIONS
&& "RuntimeInvisibleAnnotations".equals(attrName)) {
ianns = u + 8;
} else if (ANNOTATIONS
&& "RuntimeInvisibleTypeAnnotations".equals(attrName)) {
itanns = u + 8;
} else if ("BootstrapMethods".equals(attrName)) {
int[] bootstrapMethods = new int[readUnsignedShort(u + 8)];
for (int j = 0, v = u + 10; j < bootstrapMethods.length; j++) {
bootstrapMethods[j] = v;
v += 2 + readUnsignedShort(v + 2) << 1;
}
context.bootstrapMethods = bootstrapMethods;
} else {
Attribute attr = readAttribute(attrs, attrName, u + 8,
readInt(u + 4), c, -1, null);
if (attr != null) {
attr.next = attributes;
attributes = attr;
}
}
u += 6 + readInt(u + 4);
}
// visits the class declaration
classVisitor.visit(readInt(items[1] - 7), access, name, signature,
superClass, interfaces);
// visits the source and debug info
if ((flags & SKIP_DEBUG) == 0
&& (sourceFile != null || sourceDebug != null)) {
classVisitor.visitSource(sourceFile, sourceDebug);
}
// visits the outer class
if (enclosingOwner != null) {
classVisitor.visitOuterClass(enclosingOwner, enclosingName,
enclosingDesc);
}
// visits the class annotations and type annotations
if (ANNOTATIONS && anns != 0) {
for (int i = readUnsignedShort(anns), v = anns + 2; i > 0; --i) {
v = readAnnotationValues(v + 2, c, true,
classVisitor.visitAnnotation(readUTF8(v, c), true));
}
}
if (ANNOTATIONS && ianns != 0) {
for (int i = readUnsignedShort(ianns), v = ianns + 2; i > 0; --i) {
v = readAnnotationValues(v + 2, c, true,
classVisitor.visitAnnotation(readUTF8(v, c), false));
}
}
// visits the end of the class
classVisitor.visitEnd();
}
/**
* Reads the values of an annotation and makes the given visitor visit them.
*
* @param v the start offset in {@link #b b} of the values to be read
* (including the unsigned short that gives the number of
* values).
* @param buf buffer to be used to call {@link #readUTF8 readUTF8},
* {@link #readClass(int, char[]) readClass} or {@link #readConst
* readConst}.
* @param named if the annotation values are named or not.
* @param av the visitor that must visit the values.
* @return the end offset of the annotation values.
*/
private int readAnnotationValues(int v, final char[] buf,
final boolean named, final AnnotationVisitor av) {
int i = readUnsignedShort(v);
v += 2;
if (named) {
for (; i > 0; --i) {
v = readAnnotationValue(v + 2, buf, readUTF8(v, buf), av);
}
} else {
for (; i > 0; --i) {
v = readAnnotationValue(v, buf, null, av);
}
}
if (av != null) {
av.visitEnd();
}
return v;
}
/**
* Reads a value of an annotation and makes the given visitor visit it.
*
* @param v the start offset in {@link #b b} of the value to be read
* (not including the value name constant pool index).
* @param buf buffer to be used to call {@link #readUTF8 readUTF8},
* {@link #readClass(int, char[]) readClass} or {@link #readConst
* readConst}.
* @param name the name of the value to be read.
* @param av the visitor that must visit the value.
* @return the end offset of the annotation value.
*/
private int readAnnotationValue(int v, final char[] buf, final String name,
final AnnotationVisitor av) {
if (av == null) {
return switch (b[v] & 0xFF) {
// enum_const_value
case 'e' -> v + 5;
// annotation_value
case '@' -> readAnnotationValues(v + 3, buf, true, null);
// array_value
case '[' -> readAnnotationValues(v + 1, buf, false, null);
default -> v + 3;
};
}
int i;
switch (b[v++] & 0xFF) {
case 'I': // pointer to CONSTANT_Integer
case 'J': // pointer to CONSTANT_Long
case 'F': // pointer to CONSTANT_Float
case 'D': // pointer to CONSTANT_Double
av.visit(name, readConst(readUnsignedShort(v), buf));
v += 2;
break;
case 'B': // pointer to CONSTANT_Byte
av.visit(name, (byte) readInt(items[readUnsignedShort(v)]));
v += 2;
break;
case 'Z': // pointer to CONSTANT_Boolean
av.visit(name, readInt(items[readUnsignedShort(v)]) == 0 ? Boolean.FALSE : Boolean.TRUE);
v += 2;
break;
case 'S': // pointer to CONSTANT_Short
av.visit(name, (short) readInt(items[readUnsignedShort(v)]));
v += 2;
break;
case 'C': // pointer to CONSTANT_Char
av.visit(name, (char) readInt(items[readUnsignedShort(v)]));
v += 2;
break;
case 's': // pointer to CONSTANT_Utf8
av.visit(name, readUTF8(v, buf));
v += 2;
break;
case 'e': // enum_const_value
av.visitEnum(name, readUTF8(v, buf), readUTF8(v + 2, buf));
v += 4;
break;
case 'c': // class_info
av.visit(name, Type.getType(readUTF8(v, buf)));
v += 2;
break;
case '@': // annotation_value
v = readAnnotationValues(v + 2, buf, true,
av.visitAnnotation(name, readUTF8(v, buf)));
break;
case '[': // array_value
int size = readUnsignedShort(v);
v += 2;
if (size == 0) {
return readAnnotationValues(v - 2, buf, false,
av.visitArray(name));
}
switch (this.b[v++] & 0xFF) {
case 'B':
byte[] bv = new byte[size];
for (i = 0; i < size; i++) {
bv[i] = (byte) readInt(items[readUnsignedShort(v)]);
v += 3;
}
av.visit(name, bv);
--v;
break;
case 'Z':
boolean[] zv = new boolean[size];
for (i = 0; i < size; i++) {
zv[i] = readInt(items[readUnsignedShort(v)]) != 0;
v += 3;
}
av.visit(name, zv);
--v;
break;
case 'S':
short[] sv = new short[size];
for (i = 0; i < size; i++) {
sv[i] = (short) readInt(items[readUnsignedShort(v)]);
v += 3;
}
av.visit(name, sv);
--v;
break;
case 'C':
char[] cv = new char[size];
for (i = 0; i < size; i++) {
cv[i] = (char) readInt(items[readUnsignedShort(v)]);
v += 3;
}
av.visit(name, cv);
--v;
break;
case 'I':
int[] iv = new int[size];
for (i = 0; i < size; i++) {
iv[i] = readInt(items[readUnsignedShort(v)]);
v += 3;
}
av.visit(name, iv);
--v;
break;
case 'J':
long[] lv = new long[size];
for (i = 0; i < size; i++) {
lv[i] = readLong(items[readUnsignedShort(v)]);
v += 3;
}
av.visit(name, lv);
--v;
break;
case 'F':
float[] fv = new float[size];
for (i = 0; i < size; i++) {
fv[i] = Float
.intBitsToFloat(readInt(items[readUnsignedShort(v)]));
v += 3;
}
av.visit(name, fv);
--v;
break;
case 'D':
double[] dv = new double[size];
for (i = 0; i < size; i++) {
dv[i] = Double
.longBitsToDouble(readLong(items[readUnsignedShort(v)]));
v += 3;
}
av.visit(name, dv);
--v;
break;
default:
v = readAnnotationValues(v - 3, buf, false, av.visitArray(name));
}
break;
default:
// no-op
}
return v;
}
/**
* Returns the label corresponding to the given offset. The default
* implementation of this method creates a label for the given offset if it
* has not been already created.
*
* @param offset a bytecode offset in a method.
* @param labels the already created labels, indexed by their offset. If a
* label already exists for offset this method must not create a
* new one. Otherwise, it must store the new label in this array.
* @return a non-null Label, which must be equal to labels[offset].
*/
protected Label readLabel(int offset, Label[] labels) {
// SPRING PATCH: leniently handle offset mismatch
if (offset >= labels.length) {
return new Label();
}
// END OF PATCH
if (labels[offset] == null) {
labels[offset] = new Label();
}
return labels[offset];
}
/**
* Returns the start index of the attribute_info structure of this class.
*
* @return the start index of the attribute_info structure of this class.
*/
private int getAttributes() {
// skips the header
int u = header + 8 + readUnsignedShort(header + 6) * 2;
// skips fields and methods
for (int i = readUnsignedShort(u); i > 0; --i) {
for (int j = readUnsignedShort(u + 8); j > 0; --j) {
u += 6 + readInt(u + 12);
}
u += 8;
}
u += 2;
for (int i = readUnsignedShort(u); i > 0; --i) {
for (int j = readUnsignedShort(u + 8); j > 0; --j) {
u += 6 + readInt(u + 12);
}
u += 8;
}
// the attribute_info structure starts just after the methods
return u + 2;
}
/**
* Reads an attribute in {@link #b b}.
*
* @param attrs prototypes of the attributes that must be parsed during the
* visit of the class. Any attribute whose type is not equal to
* the type of one the prototypes is ignored (i.e. an empty
* {@link Attribute} instance is returned).
* @param type the type of the attribute.
* @param off index of the first byte of the attribute's content in
* {@link #b b}. The 6 attribute header bytes, containing the
* type and the length of the attribute, are not taken into
* account here (they have already been read).
* @param len the length of the attribute's content.
* @param buf buffer to be used to call {@link #readUTF8 readUTF8},
* {@link #readClass(int, char[]) readClass} or {@link #readConst
* readConst}.
* @param codeOff index of the first byte of code's attribute content in
* {@link #b b}, or -1 if the attribute to be read is not a code
* attribute. The 6 attribute header bytes, containing the type
* and the length of the attribute, are not taken into account
* here.
* @param labels the labels of the method's code, or {@code null} if the
* attribute to be read is not a code attribute.
* @return the attribute that has been read, or {@code null} to skip this
* attribute.
*/
private Attribute readAttribute(final Attribute[] attrs, final String type,
final int off, final int len, final char[] buf, final int codeOff,
final Label[] labels) {
for (int i = 0; i < attrs.length; ++i) {
if (attrs[i].type.equals(type)) {
return attrs[i].read(this, off, len, buf, codeOff, labels);
}
}
return new Attribute(type).read(this, off, len, null, -1, null);
}
/**
* Reads a byte value in {@link #b b}. This method is intended for
* {@link Attribute} sub classes, and is normally not needed by class
* generators or adapters.
*
* @param index the start index of the value to be read in {@link #b b}.
* @return the read value.
*/
public int readByte(final int index) {
return b[index] & 0xFF;
}
/**
* Reads an unsigned short value in {@link #b b}. This method is intended
* for {@link Attribute} sub classes, and is normally not needed by class
* generators or adapters.
*
* @param index the start index of the value to be read in {@link #b b}.
* @return the read value.
*/
public int readUnsignedShort(final int index) {
byte[] b = this.b;
return ((b[index] & 0xFF) << 8) | (b[index + 1] & 0xFF);
}
/**
* Reads a signed short value in {@link #b b}. This method is intended
* for {@link Attribute} sub classes, and is normally not needed by class
* generators or adapters.
*
* @param index the start index of the value to be read in {@link #b b}.
* @return the read value.
*/
public short readShort(final int index) {
byte[] b = this.b;
return (short) (((b[index] & 0xFF) << 8) | (b[index + 1] & 0xFF));
}
/**
* Reads a signed int value in {@link #b b}. This method is intended for
* {@link Attribute} sub classes, and is normally not needed by class
* generators or adapters.
*
* @param index the start index of the value to be read in {@link #b b}.
* @return the read value.
*/
public int readInt(final int index) {
byte[] b = this.b;
return ((b[index] & 0xFF) << 24) | ((b[index + 1] & 0xFF) << 16)
| ((b[index + 2] & 0xFF) << 8) | (b[index + 3] & 0xFF);
}
/**
* Reads a signed long value in {@link #b b}. This method is intended for
* {@link Attribute} sub classes, and is normally not needed by class
* generators or adapters.
*
* @param index the start index of the value to be read in {@link #b b}.
* @return the read value.
*/
public long readLong(final int index) {
long l1 = readInt(index);
long l0 = readInt(index + 4) & 0xFFFFFFFFL;
return (l1 << 32) | l0;
}
/**
* Reads an UTF8 string constant pool item in {@link #b b}. This method
* is intended for {@link Attribute} sub classes, and is normally not needed
* by class generators or adapters.
*
* @param index the start index of an unsigned short value in {@link #b b},
* whose value is the index of an UTF8 constant pool item.
* @param buf buffer to be used to read the item. This buffer must be
* sufficiently large. It is not automatically resized.
* @return the String corresponding to the specified UTF8 item.
*/
public String readUTF8(int index, final char[] buf) {
int item = readUnsignedShort(index);
if (index == 0 || item == 0) {
return null;
}
String s = strings[item];
if (s != null) {
return s;
}
index = items[item];
strings[item] = readUTF(index + 2, readUnsignedShort(index), buf);
return strings[item];
}
/**
* Reads UTF8 string in {@link #b b}.
*
* @param index start offset of the UTF8 string to be read.
* @param utfLen length of the UTF8 string to be read.
* @param buf buffer to be used to read the string. This buffer must be
* sufficiently large. It is not automatically resized.
* @return the String corresponding to the specified UTF8 string.
*/
private String readUTF(int index, final int utfLen, final char[] buf) {
int endIndex = index + utfLen;
byte[] b = this.b;
int strLen = 0;
int c;
int st = 0;
char cc = 0;
while (index < endIndex) {
c = b[index++];
switch (st) {
case 0:
c = c & 0xFF;
if (c < 0x80) { // 0xxxxxxx
buf[strLen++] = (char) c;
} else if (c < 0xE0 && c > 0xBF) { // 110x xxxx 10xx xxxx
cc = (char) (c & 0x1F);
st = 1;
} else { // 1110 xxxx 10xx xxxx 10xx xxxx
cc = (char) (c & 0x0F);
st = 2;
}
break;
case 1: // byte 2 of 2-byte char or byte 3 of 3-byte char
buf[strLen++] = (char) ((cc << 6) | (c & 0x3F));
st = 0;
break;
case 2: // byte 2 of 3-byte char
cc = (char) ((cc << 6) | (c & 0x3F));
st = 1;
break;
default:
// no-op
}
}
return new String(buf, 0, strLen);
}
/**
* Reads a class constant pool item in {@link #b b}. This method is
* intended for {@link Attribute} sub classes, and is normally not needed by
* class generators or adapters.
*
* @param index the start index of an unsigned short value in {@link #b b},
* whose value is the index of a class constant pool item.
* @param buf buffer to be used to read the item. This buffer must be
* sufficiently large. It is not automatically resized.
* @return the String corresponding to the specified class item.
*/
public String readClass(final int index, final char[] buf) {
// computes the start index of the CONSTANT_Class item in b
// and reads the CONSTANT_Utf8 item designated by
// the first two bytes of this CONSTANT_Class item
return readUTF8(items[readUnsignedShort(index)], buf);
}
/**
* Reads a numeric or string constant pool item in {@link #b b}. This
* method is intended for {@link Attribute} sub classes, and is normally not
* needed by class generators or adapters.
*
* @param item the index of a constant pool item.
* @param buf buffer to be used to read the item. This buffer must be
* sufficiently large. It is not automatically resized.
* @return the {@link Integer}, {@link Float}, {@link Long}, {@link Double},
* {@link String}, {@link Type} or {@link Handle} corresponding to
* the given constant pool item.
*/
public Object readConst(final int item, final char[] buf) {
int index = items[item];
switch (b[index - 1]) {
case INT:
return readInt(index);
case FLOAT:
return Float.intBitsToFloat(readInt(index));
case LONG:
return readLong(index);
case DOUBLE:
return Double.longBitsToDouble(readLong(index));
case CLASS:
return Type.getObjectType(readUTF8(index, buf));
case STR:
return readUTF8(index, buf);
case MTYPE:
return Type.getMethodType(readUTF8(index, buf));
default: // case ClassWriter.HANDLE_BASE + [1..9]:
int tag = readByte(index);
int[] items = this.items;
int cpIndex = items[readUnsignedShort(index + 1)];
String owner = readClass(cpIndex, buf);
cpIndex = items[readUnsignedShort(cpIndex + 2)];
String name = readUTF8(cpIndex, buf);
String desc = readUTF8(cpIndex + 2, buf);
return new Handle(tag, owner, name, desc, tag == Opcodes.H_INVOKEINTERFACE);
}
}
}
