/***
* ASM: a very small and fast Java bytecode manipulation framework
* Copyright (c) 2000-2005 INRIA, France Telecom
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
package clojure.asm;
import java.io.InputStream;
import java.io.IOException;
/**
* A Java class parser to make a {@link ClassVisitor} visit an existing class.
* 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
*/
public class ClassReader{
/**
* Flag to skip method code. If this class is set <code>CODE</code>
* attribute won't be visited. This can be used, for example, to retrieve
* annotations for methods and method parameters.
*/
public final static int SKIP_CODE = 1;
/**
* 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 MethodVisitor#visitLocalVariable visitLocalVariable} and
* {@link MethodVisitor#visitLineNumber visitLineNumber} methods will not be
* called.
*/
public final static int SKIP_DEBUG = 2;
/**
* Flag to skip the stack map frames in the class. If this flag is set the
* stack map frames of the class is not visited, i.e. the
* {@link MethodVisitor#visitFrame visitFrame} method will not be called.
* This flag is useful when the {@link ClassWriter#COMPUTE_FRAMES} option is
* used: it avoids visiting frames that will be ignored and recomputed from
* scratch in the class writer.
*/
public final static int SKIP_FRAMES = 4;
/**
* Flag to expand the stack map frames. By default stack map frames are
* visited in their original format (i.e. "expanded" for classes whose
* version is less than V1_6, and "compressed" for the other classes). If
* this flag is set, stack map frames are always visited in expanded format
* (this option adds a decompression/recompression step in ClassReader and
* ClassWriter which degrades performances quite a lot).
*/
public final static int EXPAND_FRAMES = 8;
/**
* The class to be parsed. <i>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.</i>
*/
public 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;
/**
* Start index of the class header information (access, name...) in
* {@link #b b}.
*/
public final int header;
// ------------------------------------------------------------------------
// Constructors
// ------------------------------------------------------------------------
/**
* Constructs a new {@link ClassReader} object.
*
* @param b the bytecode of the class to be read.
*/
public ClassReader(final byte[] b){
this(b, 0, b.length);
}
/**
* Constructs a new {@link 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.
*/
public ClassReader(final byte[] b, final int off, final int len){
this.b = b;
// 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 ClassWriter.FIELD:
case ClassWriter.METH:
case ClassWriter.IMETH:
case ClassWriter.INT:
case ClassWriter.FLOAT:
case ClassWriter.NAME_TYPE:
size = 5;
break;
case ClassWriter.LONG:
case ClassWriter.DOUBLE:
size = 9;
++i;
break;
case ClassWriter.UTF8:
size = 3 + readUnsignedShort(index + 1);
if(size > max)
{
max = size;
}
break;
// case ClassWriter.CLASS:
// case ClassWriter.STR:
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 <tt>null</tt> for
* {@link Object} class.
* @see ClassVisitor#visit(int,int,String,String,String,String[])
*/
public String getSuperName(){
int n = items[readUnsignedShort(header + 4)];
return n == 0 ? null : readUTF8(n, 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
* <tt>null</tt>.
* @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;
}
/**
* Copies the constant pool data into the given {@link ClassWriter}. Should
* be called before the {@link #accept(ClassVisitor,int)} method.
*
* @param classWriter the {@link ClassWriter} to copy constant pool into.
*/
void copyPool(final ClassWriter classWriter){
char[] buf = new char[maxStringLength];
int ll = items.length;
Item[] items2 = new Item[ll];
for(int i = 1; i < ll; i++)
{
int index = items[i];
int tag = b[index - 1];
Item item = new Item(i);
int nameType;
switch(tag)
{
case ClassWriter.FIELD:
case ClassWriter.METH:
case ClassWriter.IMETH:
nameType = items[readUnsignedShort(index + 2)];
item.set(tag,
readClass(index, buf),
readUTF8(nameType, buf),
readUTF8(nameType + 2, buf));
break;
case ClassWriter.INT:
item.set(readInt(index));
break;
case ClassWriter.FLOAT:
item.set(Float.intBitsToFloat(readInt(index)));
break;
case ClassWriter.NAME_TYPE:
item.set(tag,
readUTF8(index, buf),
readUTF8(index + 2, buf),
null);
break;
case ClassWriter.LONG:
item.set(readLong(index));
++i;
break;
case ClassWriter.DOUBLE:
item.set(Double.longBitsToDouble(readLong(index)));
++i;
break;
case ClassWriter.UTF8:
{
String s = strings[i];
if(s == null)
{
index = items[i];
s = strings[i] = readUTF(index + 2,
readUnsignedShort(index),
buf);
}
item.set(tag, s, null, null);
}
break;
// case ClassWriter.STR:
// case ClassWriter.CLASS:
default:
item.set(tag, readUTF8(index, buf), null, null);
break;
}
int index2 = item.hashCode % items2.length;
item.next = items2[index2];
items2[index2] = item;
}
int off = items[1] - 1;
classWriter.pool.putByteArray(b, off, header - off);
classWriter.items = items2;
classWriter.threshold = (int) (0.75d * ll);
classWriter.index = ll;
}
/**
* Constructs a new {@link ClassReader} object.
*
* @param is an input stream from which to read the class.
* @throws IOException if a problem occurs during reading.
*/
public ClassReader(final InputStream is) throws IOException{
this(readClass(is));
}
/**
* Constructs a new {@link ClassReader} object.
*
* @param name the fully qualified name of the class to be read.
* @throws IOException if an exception occurs during reading.
*/
public ClassReader(final String name) throws IOException{
this(ClassLoader.getSystemResourceAsStream(name.replace('.', '/')
+ ".class"));
}
/**
* Reads the bytecode of a class.
*
* @param is an input stream from which to read the class.
* @return the bytecode read from the given input stream.
* @throws IOException if a problem occurs during reading.
*/
private static byte[] readClass(final InputStream is) throws IOException{
if(is == null)
{
throw new IOException("Class not found");
}
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)
{
byte[] c = new byte[b.length + 1000];
System.arraycopy(b, 0, c, 0, len);
b = c;
}
}
}
// ------------------------------------------------------------------------
// Public methods
// ------------------------------------------------------------------------
/**
* Makes the given visitor visit the Java class of this {@link ClassReader}.
* This class is the one specified in the constructor (see
* {@link #ClassReader(byte[]) ClassReader}).
*
* @param classVisitor the visitor that must visit this class.
* @param flags option flags that can be used to modify the default behavior
* of this class. See {@link #SKIP_DEBUG}, {@link #EXPAND_FRAMES}.
*/
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 ClassReader}.
* This class is the one specified in the constructor (see
* {@link #ClassReader(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. <i>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</i>.
* @param flags option flags that can be used to modify the default behavior
* of this class. See {@link #SKIP_DEBUG}, {@link #EXPAND_FRAMES}.
*/
public void accept(
final ClassVisitor classVisitor,
final Attribute[] attrs,
final int flags){
byte[] b = this.b; // the bytecode array
char[] c = new char[maxStringLength]; // buffer used to read strings
int i, j, k; // loop variables
int u, v, w; // indexes in b
Attribute attr;
int access;
String name;
String desc;
String attrName;
String signature;
int anns = 0;
int ianns = 0;
Attribute cattrs = null;
// visits the header
u = header;
access = readUnsignedShort(u);
name = readClass(u + 2, c);
v = items[readUnsignedShort(u + 4)];
String superClassName = v == 0 ? null : readUTF8(v, c);
String[] implementedItfs = new String[readUnsignedShort(u + 6)];
w = 0;
u += 8;
for(i = 0; i < implementedItfs.length; ++i)
{
implementedItfs[i] = readClass(u, c);
u += 2;
}
boolean skipCode = (flags & SKIP_CODE) != 0;
boolean skipDebug = (flags & SKIP_DEBUG) != 0;
boolean unzip = (flags & EXPAND_FRAMES) != 0;
// skips fields and methods
v = u;
i = readUnsignedShort(v);
v += 2;
for(; i > 0; --i)
{
j = readUnsignedShort(v + 6);
v += 8;
for(; j > 0; --j)
{
v += 6 + readInt(v + 2);
}
}
i = readUnsignedShort(v);
v += 2;
for(; i > 0; --i)
{
j = readUnsignedShort(v + 6);
v += 8;
for(; j > 0; --j)
{
v += 6 + readInt(v + 2);
}
}
// reads the class's attributes
signature = null;
String sourceFile = null;
String sourceDebug = null;
String enclosingOwner = null;
String enclosingName = null;
String enclosingDesc = null;
i = readUnsignedShort(v);
v += 2;
for(; i > 0; --i)
{
attrName = readUTF8(v, c);
// tests are sorted in decreasing frequency order
// (based on frequencies observed on typical classes)
if(attrName.equals("SourceFile"))
{
sourceFile = readUTF8(v + 6, c);
}
else if(attrName.equals("InnerClasses"))
{
w = v + 6;
}
else if(attrName.equals("EnclosingMethod"))
{
enclosingOwner = readClass(v + 6, c);
int item = readUnsignedShort(v + 8);
if(item != 0)
{
enclosingName = readUTF8(items[item], c);
enclosingDesc = readUTF8(items[item] + 2, c);
}
}
else if(attrName.equals("Signature"))
{
signature = readUTF8(v + 6, c);
}
else if(attrName.equals("RuntimeVisibleAnnotations"))
{
anns = v + 6;
}
else if(attrName.equals("Deprecated"))
{
access |= Opcodes.ACC_DEPRECATED;
}
else if(attrName.equals("Synthetic"))
{
access |= Opcodes.ACC_SYNTHETIC;
}
else if(attrName.equals("SourceDebugExtension"))
{
int len = readInt(v + 2);
sourceDebug = readUTF(v + 6, len, new char[len]);
}
else if(attrName.equals("RuntimeInvisibleAnnotations"))
{
ianns = v + 6;
}
else
{
attr = readAttribute(attrs,
attrName,
v + 6,
readInt(v + 2),
c,
-1,
null);
if(attr != null)
{
attr.next = cattrs;
cattrs = attr;
}
}
v += 6 + readInt(v + 2);
}
// calls the visit method
classVisitor.visit(readInt(4),
access,
name,
signature,
superClassName,
implementedItfs);
// calls the visitSource method
if(!skipDebug && (sourceFile != null || sourceDebug != null))
{
classVisitor.visitSource(sourceFile, sourceDebug);
}
// calls the visitOuterClass method
if(enclosingOwner != null)
{
classVisitor.visitOuterClass(enclosingOwner,
enclosingName,
enclosingDesc);
}
// visits the class annotations
for(i = 1; i >= 0; --i)
{
v = i == 0 ? ianns : anns;
if(v != 0)
{
j = readUnsignedShort(v);
v += 2;
for(; j > 0; --j)
{
v = readAnnotationValues(v + 2,
c,
true,
classVisitor.visitAnnotation(readUTF8(v, c), i != 0));
}
}
}
// visits the class attributes
while(cattrs != null)
{
attr = cattrs.next;
cattrs.next = null;
classVisitor.visitAttribute(cattrs);
cattrs = attr;
}
// calls the visitInnerClass method
if(w != 0)
{
i = readUnsignedShort(w);
w += 2;
for(; i > 0; --i)
{
classVisitor.visitInnerClass(readUnsignedShort(w) == 0
? null
: readClass(w, c), readUnsignedShort(w + 2) == 0
? null
: readClass(w + 2, c), readUnsignedShort(w + 4) == 0
? null
: readUTF8(w + 4, c),
readUnsignedShort(w + 6));
w += 8;
}
}
// visits the fields
i = readUnsignedShort(u);
u += 2;
for(; i > 0; --i)
{
access = readUnsignedShort(u);
name = readUTF8(u + 2, c);
desc = readUTF8(u + 4, c);
// visits the field's attributes and looks for a ConstantValue
// attribute
int fieldValueItem = 0;
signature = null;
anns = 0;
ianns = 0;
cattrs = null;
j = readUnsignedShort(u + 6);
u += 8;
for(; j > 0; --j)
{
attrName = readUTF8(u, c);
// tests are sorted in decreasing frequency order
// (based on frequencies observed on typical classes)
if(attrName.equals("ConstantValue"))
{
fieldValueItem = readUnsignedShort(u + 6);
}
else if(attrName.equals("Signature"))
{
signature = readUTF8(u + 6, c);
}
else if(attrName.equals("Deprecated"))
{
access |= Opcodes.ACC_DEPRECATED;
}
else if(attrName.equals("Synthetic"))
{
access |= Opcodes.ACC_SYNTHETIC;
}
else if(attrName.equals("RuntimeVisibleAnnotations"))
{
anns = u + 6;
}
else if(attrName.equals("RuntimeInvisibleAnnotations"))
{
ianns = u + 6;
}
else
{
attr = readAttribute(attrs,
attrName,
u + 6,
readInt(u + 2),
c,
-1,
null);
if(attr != null)
{
attr.next = cattrs;
cattrs = attr;
}
}
u += 6 + readInt(u + 2);
}
// visits the field
FieldVisitor fv = classVisitor.visitField(access,
name,
desc,
signature,
fieldValueItem == 0 ? null : readConst(fieldValueItem, c));
// visits the field annotations and attributes
if(fv != null)
{
for(j = 1; j >= 0; --j)
{
v = j == 0 ? ianns : anns;
if(v != 0)
{
k = readUnsignedShort(v);
v += 2;
for(; k > 0; --k)
{
v = readAnnotationValues(v + 2,
c,
true,
fv.visitAnnotation(readUTF8(v, c), j != 0));
}
}
}
while(cattrs != null)
{
attr = cattrs.next;
cattrs.next = null;
fv.visitAttribute(cattrs);
cattrs = attr;
}
fv.visitEnd();
}
}
// visits the methods
i = readUnsignedShort(u);
u += 2;
for(; i > 0; --i)
{
int u0 = u + 6;
access = readUnsignedShort(u);
name = readUTF8(u + 2, c);
desc = readUTF8(u + 4, c);
signature = null;
anns = 0;
ianns = 0;
int dann = 0;
int mpanns = 0;
int impanns = 0;
cattrs = null;
v = 0;
w = 0;
// looks for Code and Exceptions attributes
j = readUnsignedShort(u + 6);
u += 8;
for(; j > 0; --j)
{
attrName = readUTF8(u, c);
int attrSize = readInt(u + 2);
u += 6;
// tests are sorted in decreasing frequency order
// (based on frequencies observed on typical classes)
if(attrName.equals("Code"))
{
if(!skipCode)
{
v = u;
}
}
else if(attrName.equals("Exceptions"))
{
w = u;
}
else if(attrName.equals("Signature"))
{
signature = readUTF8(u, c);
}
else if(attrName.equals("Deprecated"))
{
access |= Opcodes.ACC_DEPRECATED;
}
else if(attrName.equals("RuntimeVisibleAnnotations"))
{
anns = u;
}
else if(attrName.equals("AnnotationDefault"))
{
dann = u;
}
else if(attrName.equals("Synthetic"))
{
access |= Opcodes.ACC_SYNTHETIC;
}
else if(attrName.equals("RuntimeInvisibleAnnotations"))
{
ianns = u;
}
else if(attrName.equals("RuntimeVisibleParameterAnnotations"))
{
mpanns = u;
}
else if(attrName.equals("RuntimeInvisibleParameterAnnotations"))
{
impanns = u;
}
else
{
attr = readAttribute(attrs,
attrName,
u,
attrSize,
c,
-1,
null);
if(attr != null)
{
attr.next = cattrs;
cattrs = attr;
}
}
u += attrSize;
}
// reads declared exceptions
String[] exceptions;
if(w == 0)
{
exceptions = null;
}
else
{
exceptions = new String[readUnsignedShort(w)];
w += 2;
for(j = 0; j < exceptions.length; ++j)
{
exceptions[j] = readClass(w, c);
w += 2;
}
}
// visits the method's code, if any
MethodVisitor mv = classVisitor.visitMethod(access,
name,
desc,
signature,
exceptions);
if(mv != null)
{
/*
* if the returned MethodVisitor is in fact a MethodWriter, it
* means there is no method adapter between the reader and the
* writer. If, in addition, the writer's constant pool was
* copied from this reader (mw.cw.cr == this), and the signature
* and exceptions of the method have not been changed, then it
* is possible to skip all visit events and just copy the
* original code of the method to the writer (the access, name
* and descriptor can have been changed, this is not important
* since they are not copied as is from the reader).
*/
if(mv instanceof MethodWriter)
{
MethodWriter mw = (MethodWriter) mv;
if(mw.cw.cr == this)
{
if(signature == mw.signature)
{
boolean sameExceptions = false;
if(exceptions == null)
{
sameExceptions = mw.exceptionCount == 0;
}
else
{
if(exceptions.length == mw.exceptionCount)
{
sameExceptions = true;
for(j = exceptions.length - 1; j >= 0; --j)
{
w -= 2;
if(mw.exceptions[j] != readUnsignedShort(w))
{
sameExceptions = false;
break;
}
}
}
}
if(sameExceptions)
{
/*
* we do not copy directly the code into
* MethodWriter to save a byte array copy
* operation. The real copy will be done in
* ClassWriter.toByteArray().
*/
mw.classReaderOffset = u0;
mw.classReaderLength = u - u0;
continue;
}
}
}
}
if(dann != 0)
{
AnnotationVisitor dv = mv.visitAnnotationDefault();
readAnnotationValue(dann, c, null, dv);
if(dv != null)
{
dv.visitEnd();
}
}
for(j = 1; j >= 0; --j)
{
w = j == 0 ? ianns : anns;
if(w != 0)
{
k = readUnsignedShort(w);
w += 2;
for(; k > 0; --k)
{
w = readAnnotationValues(w + 2,
c,
true,
mv.visitAnnotation(readUTF8(w, c), j != 0));
}
}
}
if(mpanns != 0)
{
readParameterAnnotations(mpanns, c, true, mv);
}
if(impanns != 0)
{
readParameterAnnotations(impanns, c, false, mv);
}
while(cattrs != null)
{
attr = cattrs.next;
cattrs.next = null;
mv.visitAttribute(cattrs);
cattrs = attr;
}
}
if(mv != null && v != 0)
{
int maxStack = readUnsignedShort(v);
int maxLocals = readUnsignedShort(v + 2);
int codeLength = readInt(v + 4);
v += 8;
int codeStart = v;
int codeEnd = v + codeLength;
mv.visitCode();
// 1st phase: finds the labels
int label;
Label[] labels = new Label[codeLength + 1];
while(v < codeEnd)
{
int opcode = b[v] & 0xFF;
switch(ClassWriter.TYPE[opcode])
{
case ClassWriter.NOARG_INSN:
case ClassWriter.IMPLVAR_INSN:
v += 1;
break;
case ClassWriter.LABEL_INSN:
label = v - codeStart + readShort(v + 1);
if(labels[label] == null)
{
labels[label] = new Label();
}
v += 3;
break;
case ClassWriter.LABELW_INSN:
label = v - codeStart + readInt(v + 1);
if(labels[label] == null)
{
labels[label] = new Label();
}
v += 5;
break;
case ClassWriter.WIDE_INSN:
opcode = b[v + 1] & 0xFF;
if(opcode == Opcodes.IINC)
{
v += 6;
}
else
{
v += 4;
}
break;
case ClassWriter.TABL_INSN:
// skips 0 to 3 padding bytes
w = v - codeStart;
v = v + 4 - (w & 3);
// reads instruction
label = w + readInt(v);
if(labels[label] == null)
{
labels[label] = new Label();
}
j = readInt(v + 8) - readInt(v + 4) + 1;
v += 12;
for(; j > 0; --j)
{
label = w + readInt(v);
v += 4;
if(labels[label] == null)
{
labels[label] = new Label();
}
}
break;
case ClassWriter.LOOK_INSN:
// skips 0 to 3 padding bytes
w = v - codeStart;
v = v + 4 - (w & 3);
// reads instruction
label = w + readInt(v);
if(labels[label] == null)
{
labels[label] = new Label();
}
j = readInt(v + 4);
v += 8;
for(; j > 0; --j)
{
label = w + readInt(v + 4);
v += 8;
if(labels[label] == null)
{
labels[label] = new Label();
}
}
break;
case ClassWriter.VAR_INSN:
case ClassWriter.SBYTE_INSN:
case ClassWriter.LDC_INSN:
v += 2;
break;
case ClassWriter.SHORT_INSN:
case ClassWriter.LDCW_INSN:
case ClassWriter.FIELDORMETH_INSN:
case ClassWriter.TYPE_INSN:
case ClassWriter.IINC_INSN:
v += 3;
break;
case ClassWriter.ITFMETH_INSN:
v += 5;
break;
// case MANA_INSN:
default:
v += 4;
break;
}
}
// parses the try catch entries
j = readUnsignedShort(v);
v += 2;
for(; j > 0; --j)
{
label = readUnsignedShort(v);
Label start = labels[label];
if(start == null)
{
labels[label] = start = new Label();
}
label = readUnsignedShort(v + 2);
Label end = labels[label];
if(end == null)
{
labels[label] = end = new Label();
}
label = readUnsignedShort(v + 4);
Label handler = labels[label];
if(handler == null)
{
labels[label] = handler = new Label();
}
int type = readUnsignedShort(v + 6);
if(type == 0)
{
mv.visitTryCatchBlock(start, end, handler, null);
}
else
{
mv.visitTryCatchBlock(start,
end,
handler,
readUTF8(items[type], c));
}
v += 8;
}
// parses the local variable, line number tables, and code
// attributes
int varTable = 0;
int varTypeTable = 0;
int stackMap = 0;
int frameCount = 0;
int frameMode = 0;
int frameOffset = 0;
int frameLocalCount = 0;
int frameLocalDiff = 0;
int frameStackCount = 0;
Object[] frameLocal = null;
Object[] frameStack = null;
boolean zip = true;
cattrs = null;
j = readUnsignedShort(v);
v += 2;
for(; j > 0; --j)
{
attrName = readUTF8(v, c);
if(attrName.equals("LocalVariableTable"))
{
if(!skipDebug)
{
varTable = v + 6;
k = readUnsignedShort(v + 6);
w = v + 8;
for(; k > 0; --k)
{
label = readUnsignedShort(w);
if(labels[label] == null)
{
labels[label] = new Label(true);
}
label += readUnsignedShort(w + 2);
if(labels[label] == null)
{
labels[label] = new Label(true);
}
w += 10;
}
}
}
else if(attrName.equals("LocalVariableTypeTable"))
{
varTypeTable = v + 6;
}
else if(attrName.equals("LineNumberTable"))
{
if(!skipDebug)
{
k = readUnsignedShort(v + 6);
w = v + 8;
for(; k > 0; --k)
{
label = readUnsignedShort(w);
if(labels[label] == null)
{
labels[label] = new Label(true);
}
labels[label].line = readUnsignedShort(w + 2);
w += 4;
}
}
}
else if(attrName.equals("StackMapTable"))
{
if((flags & SKIP_FRAMES) == 0)
{
stackMap = v + 8;
frameCount = readUnsignedShort(v + 6);
}
/*
* here we do not extract the labels corresponding to
* the attribute content. This would require a full
* parsing of the attribute, which would need to be
* repeated in the second phase (see below). Instead the
* content of the attribute is read one frame at a time
* (i.e. after a frame has been visited, the next frame
* is read), and the labels it contains are also
* extracted one frame at a time. Thanks to the ordering
* of frames, having only a "one frame lookahead" is not
* a problem, i.e. it is not possible to see an offset
* smaller than the offset of the current insn and for
* which no Label exist.
*/
// TODO true for frame offsets,
// but for UNINITIALIZED type offsets?
}
else if(attrName.equals("StackMap"))
{
if((flags & SKIP_FRAMES) == 0)
{
stackMap = v + 8;
frameCount = readUnsignedShort(v + 6);
zip = false;
}
/*
* IMPORTANT! here we assume that the frames are
* ordered, as in the StackMapTable attribute, although
* this is not guaranteed by the attribute format.
*/
}
else
{
for(k = 0; k < attrs.length; ++k)
{
if(attrs[k].type.equals(attrName))
{
attr = attrs[k].read(this,
v + 6,
readInt(v + 2),
c,
codeStart - 8,
labels);
if(attr != null)
{
attr.next = cattrs;
cattrs = attr;
}
}
}
}
v += 6 + readInt(v + 2);
}
// 2nd phase: visits each instruction
if(stackMap != 0)
{
// creates the very first (implicit) frame from the method
// descriptor
frameLocal = new Object[maxLocals];
frameStack = new Object[maxStack];
if(unzip)
{
int local = 0;
if((access & Opcodes.ACC_STATIC) == 0)
{
if(name.equals("<init>"))
{
frameLocal[local++] = Opcodes.UNINITIALIZED_THIS;
}
else
{
frameLocal[local++] = readClass(header + 2, c);
}
}
j = 1;
loop:
while(true)
{
k = j;
switch(desc.charAt(j++))
{
case'Z':
case'C':
case'B':
case'S':
case'I':
frameLocal[local++] = Opcodes.INTEGER;
break;
case'F':
frameLocal[local++] = Opcodes.FLOAT;
break;
case'J':
frameLocal[local++] = Opcodes.LONG;
break;
case'D':
frameLocal[local++] = Opcodes.DOUBLE;
break;
case'[':
while(desc.charAt(j) == '[')
{
++j;
}
if(desc.charAt(j) == 'L')
{
++j;
while(desc.charAt(j) != ';')
{
++j;
}
}
frameLocal[local++] = desc.substring(k, ++j);
break;
case'L':
while(desc.charAt(j) != ';')
{
++j;
}
frameLocal[local++] = desc.substring(k + 1,
j++);
break;
default:
break loop;
}
}
frameLocalCount = local;
}
/*
* for the first explicit frame the offset is not
* offset_delta + 1 but only offset_delta; setting the
* implicit frame offset to -1 allow the use of the
* "offset_delta + 1" rule in all cases
*/
frameOffset = -1;
}
v = codeStart;
Label l;
while(v < codeEnd)
{
w = v - codeStart;
l = labels[w];
if(l != null)
{
mv.visitLabel(l);
if(!skipDebug && l.line > 0)
{
mv.visitLineNumber(l.line, l);
}
}
while(frameLocal != null
&& (frameOffset == w || frameOffset == -1))
{
// if there is a frame for this offset,
// makes the visitor visit it,
// and reads the next frame if there is one.
if(!zip || unzip)
{
mv.visitFrame(Opcodes.F_NEW,
frameLocalCount,
frameLocal,
frameStackCount,
frameStack);
}
else if(frameOffset != -1)
{
mv.visitFrame(frameMode,
frameLocalDiff,
frameLocal,
frameStackCount,
frameStack);
}
if(frameCount > 0)
{
int tag, delta, n;
if(zip)
{
tag = b[stackMap++] & 0xFF;
}
else
{
tag = MethodWriter.FULL_FRAME;
frameOffset = -1;
}
frameLocalDiff = 0;
if(tag < MethodWriter.SAME_LOCALS_1_STACK_ITEM_FRAME)
{
delta = tag;
frameMode = Opcodes.F_SAME;
frameStackCount = 0;
}
else if(tag < MethodWriter.RESERVED)
{
delta = tag
- MethodWriter.SAME_LOCALS_1_STACK_ITEM_FRAME;
stackMap = readFrameType(frameStack,
0,
stackMap,
c,
labels);
frameMode = Opcodes.F_SAME1;
frameStackCount = 1;
}
else
{
delta = readUnsignedShort(stackMap);
stackMap += 2;
if(tag == MethodWriter.SAME_LOCALS_1_STACK_ITEM_FRAME_EXTENDED)
{
stackMap = readFrameType(frameStack,
0,
stackMap,
c,
labels);
frameMode = Opcodes.F_SAME1;
frameStackCount = 1;
}
else if(tag >= MethodWriter.CHOP_FRAME
&& tag < MethodWriter.SAME_FRAME_EXTENDED)
{
frameMode = Opcodes.F_CHOP;
frameLocalDiff = MethodWriter.SAME_FRAME_EXTENDED
- tag;
frameLocalCount -= frameLocalDiff;
frameStackCount = 0;
}
else if(tag == MethodWriter.SAME_FRAME_EXTENDED)
{
frameMode = Opcodes.F_SAME;
frameStackCount = 0;
}
else if(tag < MethodWriter.FULL_FRAME)
{
j = unzip ? frameLocalCount : 0;
for(k = tag
- MethodWriter.SAME_FRAME_EXTENDED; k > 0; k--)
{
stackMap = readFrameType(frameLocal,
j++,
stackMap,
c,
labels);
}
frameMode = Opcodes.F_APPEND;
frameLocalDiff = tag
- MethodWriter.SAME_FRAME_EXTENDED;
frameLocalCount += frameLocalDiff;
frameStackCount = 0;
}
else
{ // if (tag == FULL_FRAME) {
frameMode = Opcodes.F_FULL;
n = frameLocalDiff = frameLocalCount = readUnsignedShort(stackMap);
stackMap += 2;
for(j = 0; n > 0; n--)
{
stackMap = readFrameType(frameLocal,
j++,
stackMap,
c,
labels);
}
n = frameStackCount = readUnsignedShort(stackMap);
stackMap += 2;
for(j = 0; n > 0; n--)
{
stackMap = readFrameType(frameStack,
j++,
stackMap,
c,
labels);
}
}
}
frameOffset += delta + 1;
if(labels[frameOffset] == null)
{
labels[frameOffset] = new Label();
}
--frameCount;
}
else
{
frameLocal = null;
}
}
int opcode = b[v] & 0xFF;
switch(ClassWriter.TYPE[opcode])
{
case ClassWriter.NOARG_INSN:
mv.visitInsn(opcode);
v += 1;
break;
case ClassWriter.IMPLVAR_INSN:
if(opcode > Opcodes.ISTORE)
{
opcode -= 59; // ISTORE_0
mv.visitVarInsn(Opcodes.ISTORE + (opcode >> 2),
opcode & 0x3);
}
else
{
opcode -= 26; // ILOAD_0
mv.visitVarInsn(Opcodes.ILOAD + (opcode >> 2),
opcode & 0x3);
}
v += 1;
break;
case ClassWriter.LABEL_INSN:
mv.visitJumpInsn(opcode, labels[w
+ readShort(v + 1)]);
v += 3;
break;
case ClassWriter.LABELW_INSN:
mv.visitJumpInsn(opcode - 33, labels[w
+ readInt(v + 1)]);
v += 5;
break;
case ClassWriter.WIDE_INSN:
opcode = b[v + 1] & 0xFF;
if(opcode == Opcodes.IINC)
{
mv.visitIincInsn(readUnsignedShort(v + 2),
readShort(v + 4));
v += 6;
}
else
{
mv.visitVarInsn(opcode,
readUnsignedShort(v + 2));
v += 4;
}
break;
case ClassWriter.TABL_INSN:
// skips 0 to 3 padding bytes
v = v + 4 - (w & 3);
// reads instruction
label = w + readInt(v);
int min = readInt(v + 4);
int max = readInt(v + 8);
v += 12;
Label[] table = new Label[max - min + 1];
for(j = 0; j < table.length; ++j)
{
table[j] = labels[w + readInt(v)];
v += 4;
}
mv.visitTableSwitchInsn(min,
max,
labels[label],
table);
break;
case ClassWriter.LOOK_INSN:
// skips 0 to 3 padding bytes
v = v + 4 - (w & 3);
// reads instruction
label = w + readInt(v);
j = readInt(v + 4);
v += 8;
int[] keys = new int[j];
Label[] values = new Label[j];
for(j = 0; j < keys.length; ++j)
{
keys[j] = readInt(v);
values[j] = labels[w + readInt(v + 4)];
v += 8;
}
mv.visitLookupSwitchInsn(labels[label],
keys,
values);
break;
case ClassWriter.VAR_INSN:
mv.visitVarInsn(opcode, b[v + 1] & 0xFF);
v += 2;
break;
case ClassWriter.SBYTE_INSN:
mv.visitIntInsn(opcode, b[v + 1]);
v += 2;
break;
case ClassWriter.SHORT_INSN:
mv.visitIntInsn(opcode, readShort(v + 1));
v += 3;
break;
case ClassWriter.LDC_INSN:
mv.visitLdcInsn(readConst(b[v + 1] & 0xFF, c));
v += 2;
break;
case ClassWriter.LDCW_INSN:
mv.visitLdcInsn(readConst(readUnsignedShort(v + 1),
c));
v += 3;
break;
case ClassWriter.FIELDORMETH_INSN:
case ClassWriter.ITFMETH_INSN:
int cpIndex = items[readUnsignedShort(v + 1)];
String iowner = readClass(cpIndex, c);
cpIndex = items[readUnsignedShort(cpIndex + 2)];
String iname = readUTF8(cpIndex, c);
String idesc = readUTF8(cpIndex + 2, c);
if(opcode < Opcodes.INVOKEVIRTUAL)
{
mv.visitFieldInsn(opcode, iowner, iname, idesc);
}
else
{
mv.visitMethodInsn(opcode, iowner, iname, idesc);
}
if(opcode == Opcodes.INVOKEINTERFACE)
{
v += 5;
}
else
{
v += 3;
}
break;
case ClassWriter.TYPE_INSN:
mv.visitTypeInsn(opcode, readClass(v + 1, c));
v += 3;
break;
case ClassWriter.IINC_INSN:
mv.visitIincInsn(b[v + 1] & 0xFF, b[v + 2]);
v += 3;
break;
// case MANA_INSN:
default:
mv.visitMultiANewArrayInsn(readClass(v + 1, c),
b[v + 3] & 0xFF);
v += 4;
break;
}
}
l = labels[codeEnd - codeStart];
if(l != null)
{
mv.visitLabel(l);
}
// visits the local variable tables
if(!skipDebug && varTable != 0)
{
int[] typeTable = null;
if(varTypeTable != 0)
{
k = readUnsignedShort(varTypeTable) * 3;
w = varTypeTable + 2;
typeTable = new int[k];
while(k > 0)
{
typeTable[--k] = w + 6; // signature
typeTable[--k] = readUnsignedShort(w + 8); // index
typeTable[--k] = readUnsignedShort(w); // start
w += 10;
}
}
k = readUnsignedShort(varTable);
w = varTable + 2;
for(; k > 0; --k)
{
int start = readUnsignedShort(w);
int length = readUnsignedShort(w + 2);
int index = readUnsignedShort(w + 8);
String vsignature = null;
if(typeTable != null)
{
for(int a = 0; a < typeTable.length; a += 3)
{
if(typeTable[a] == start
&& typeTable[a + 1] == index)
{
vsignature = readUTF8(typeTable[a + 2], c);
break;
}
}
}
mv.visitLocalVariable(readUTF8(w + 4, c),
readUTF8(w + 6, c),
vsignature,
labels[start],
labels[start + length],
index);
w += 10;
}
}
// visits the other attributes
while(cattrs != null)
{
attr = cattrs.next;
cattrs.next = null;
mv.visitAttribute(cattrs);
cattrs = attr;
}
// visits the max stack and max locals values
mv.visitMaxs(maxStack, maxLocals);
}
if(mv != null)
{
mv.visitEnd();
}
}
// visits the end of the class
classVisitor.visitEnd();
}
/**
* Reads parameter annotations and makes the given visitor visit them.
*
* @param v start offset in {@link #b b} of the annotations to be read.
* @param buf buffer to be used to call {@link #readUTF8 readUTF8},
* {@link #readClass(int,char[]) readClass} or
* {@link #readConst readConst}.
* @param visible <tt>true</tt> if the annotations to be read are visible
* at runtime.
* @param mv the visitor that must visit the annotations.
*/
private void readParameterAnnotations(
int v,
final char[] buf,
final boolean visible,
final MethodVisitor mv){
int n = b[v++] & 0xFF;
for(int i = 0; i < n; ++i)
{
int j = readUnsignedShort(v);
v += 2;
for(; j > 0; --j)
{
v = readAnnotationValues(v + 2,
buf,
true,
mv.visitParameterAnnotation(i,
readUTF8(v, buf),
visible));
}
}
}
/**
* 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 (<i>not
* including the value name constant pool index</i>).
* @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){
int i;
if(av == null)
{
switch(b[v] & 0xFF)
{
case'e': // enum_const_value
return v + 5;
case'@': // annotation_value
return readAnnotationValues(v + 3, buf, true, null);
case'[': // array_value
return readAnnotationValues(v + 1, buf, false, null);
default:
return v + 3;
}
}
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,
new Byte((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,
new Short((short) readInt(items[readUnsignedShort(v)])));
v += 2;
break;
case'C': // pointer to CONSTANT_Char
av.visit(name,
new Character((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));
}
}
return v;
}
private int readFrameType(
final Object[] frame,
final int index,
int v,
final char[] buf,
final Label[] labels){
int type = b[v++] & 0xFF;
switch(type)
{
case 0:
frame[index] = Opcodes.TOP;
break;
case 1:
frame[index] = Opcodes.INTEGER;
break;
case 2:
frame[index] = Opcodes.FLOAT;
break;
case 3:
frame[index] = Opcodes.DOUBLE;
break;
case 4:
frame[index] = Opcodes.LONG;
break;
case 5:
frame[index] = Opcodes.NULL;
break;
case 6:
frame[index] = Opcodes.UNINITIALIZED_THIS;
break;
case 7: // Object
frame[index] = readClass(v, buf);
v += 2;
break;
default: // Uninitialized
int offset = readUnsignedShort(v);
if(labels[offset] == null)
{
labels[offset] = new Label();
}
frame[index] = labels[offset];
v += 2;
}
return v;
}
/**
* 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 <tt>null</tt> if the
* attribute to be read is not a code attribute.
* @return the attribute that has been read, or <tt>null</tt> 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);
}
// ------------------------------------------------------------------------
// Utility methods: low level parsing
// ------------------------------------------------------------------------
/**
* Returns the start index of the constant pool item in {@link #b b}, plus
* one. <i>This method is intended for {@link Attribute} sub classes, and is
* normally not needed by class generators or adapters.</i>
*
* @param item the index a constant pool item.
* @return the start index of the constant pool item in {@link #b b}, plus
* one.
*/
public int getItem(final int item){
return items[item];
}
/**
* Reads a byte value in {@link #b b}. <i>This method is intended for
* {@link Attribute} sub classes, and is normally not needed by class
* generators or adapters.</i>
*
* @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}. <i>This method is
* intended for {@link Attribute} sub classes, and is normally not needed by
* class generators or adapters.</i>
*
* @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}. <i>This method is intended
* for {@link Attribute} sub classes, and is normally not needed by class
* generators or adapters.</i>
*
* @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}. <i>This method is intended for
* {@link Attribute} sub classes, and is normally not needed by class
* generators or adapters.</i>
*
* @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}. <i>This method is intended
* for {@link Attribute} sub classes, and is normally not needed by class
* generators or adapters.</i>
*
* @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}. <i>This method
* is intended for {@link Attribute} sub classes, and is normally not needed
* by class generators or adapters.</i>
*
* @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);
String s = strings[item];
if(s != null)
{
return s;
}
index = items[item];
return strings[item] = readUTF(index + 2, readUnsignedShort(index), buf);
}
/**
* 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, d, e;
while(index < endIndex)
{
c = b[index++] & 0xFF;
switch(c >> 4)
{
case 0:
case 1:
case 2:
case 3:
case 4:
case 5:
case 6:
case 7:
// 0xxxxxxx
buf[strLen++] = (char) c;
break;
case 12:
case 13:
// 110x xxxx 10xx xxxx
d = b[index++];
buf[strLen++] = (char) (((c & 0x1F) << 6) | (d & 0x3F));
break;
default:
// 1110 xxxx 10xx xxxx 10xx xxxx
d = b[index++];
e = b[index++];
buf[strLen++] = (char) (((c & 0x0F) << 12)
| ((d & 0x3F) << 6) | (e & 0x3F));
break;
}
}
return new String(buf, 0, strLen);
}
/**
* Reads a class constant pool item in {@link #b b}. <i>This method is
* intended for {@link Attribute} sub classes, and is normally not needed by
* class generators or adapters.</i>
*
* @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}. <i>This
* method is intended for {@link Attribute} sub classes, and is normally not
* needed by class generators or adapters.</i>
*
* @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} or {@link Type} 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 ClassWriter.INT:
return new Integer(readInt(index));
case ClassWriter.FLOAT:
return new Float(Float.intBitsToFloat(readInt(index)));
case ClassWriter.LONG:
return new Long(readLong(index));
case ClassWriter.DOUBLE:
return new Double(Double.longBitsToDouble(readLong(index)));
case ClassWriter.CLASS:
String s = readUTF8(index, buf);
return s.charAt(0) == '['
? Type.getType(s)
: Type.getObjectType(s);
// case ClassWriter.STR:
default:
return readUTF8(index, buf);
}
}
}