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java.lang.Objectnet.sf.retrotranslator.runtime.asm.ClassReader
public class ClassReader
A Java class parser to make a 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.
Field Summary | |
---|---|
byte[] |
b
The class to be parsed. |
int |
header
Start index of the class header information (access, name...) in b . |
private int[] |
items
The start index of each constant pool item in b , plus one. |
private int |
maxStringLength
Maximum length of the strings contained in the constant pool of the class. |
private java.lang.String[] |
strings
The String objects corresponding to the CONSTANT_Utf8 items. |
Constructor Summary | |
---|---|
ClassReader(byte[] b)
Constructs a new ClassReader object. |
|
ClassReader(byte[] b,
int off,
int len)
Constructs a new ClassReader object. |
|
ClassReader(java.io.InputStream is)
Constructs a new ClassReader object. |
|
ClassReader(java.lang.String name)
Constructs a new ClassReader object. |
Method Summary | |
---|---|
void |
accept(ClassVisitor classVisitor,
Attribute[] attrs,
boolean skipDebug)
Makes the given visitor visit the Java class of this ClassReader . |
void |
accept(ClassVisitor classVisitor,
boolean skipDebug)
Makes the given visitor visit the Java class of this ClassReader . |
(package private) void |
copyPool(ClassWriter classWriter)
Copies the constant pool data into the given ClassWriter . |
int |
getItem(int item)
Returns the start index of the constant pool item in b , plus
one. |
private int |
readAnnotationValue(int v,
char[] buf,
java.lang.String name,
AnnotationVisitor av)
Reads a value of an annotation and makes the given visitor visit it. |
private int |
readAnnotationValues(int v,
char[] buf,
AnnotationVisitor av)
Reads the values of an annotation and makes the given visitor visit them. |
private Attribute |
readAttribute(Attribute[] attrs,
java.lang.String type,
int off,
int len,
char[] buf,
int codeOff,
Label[] labels)
Reads an attribute in b . |
int |
readByte(int index)
Reads a byte value in b . |
private static byte[] |
readClass(java.io.InputStream is)
Reads the bytecode of a class. |
java.lang.String |
readClass(int index,
char[] buf)
Reads a class constant pool item in b . |
java.lang.Object |
readConst(int item,
char[] buf)
Reads a numeric or string constant pool item in b . |
int |
readInt(int index)
Reads a signed int value in b . |
long |
readLong(int index)
Reads a signed long value in b . |
private void |
readParameterAnnotations(int v,
char[] buf,
boolean visible,
MethodVisitor mv)
Reads parameter annotations and makes the given visitor visit them. |
short |
readShort(int index)
Reads a signed short value in b . |
int |
readUnsignedShort(int index)
Reads an unsigned short value in b . |
private java.lang.String |
readUTF(int index,
int utfLen,
char[] buf)
Reads UTF8 string in b . |
java.lang.String |
readUTF8(int index,
char[] buf)
Reads an UTF8 string constant pool item in b . |
Methods inherited from class java.lang.Object |
---|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
---|
public final byte[] b
Attribute
sub classes, and
is normally not needed by class generators or adapters.
private int[] items
b
, plus one.
The one byte offset skips the constant pool item tag that indicates its
type.
private java.lang.String[] strings
private int maxStringLength
public final int header
b
.
Constructor Detail |
---|
public ClassReader(byte[] b)
ClassReader
object.
b
- the bytecode of the class to be read.public ClassReader(byte[] b, int off, int len)
ClassReader
object.
b
- the bytecode of the class to be read.off
- the start offset of the class data.len
- the length of the class data.public ClassReader(java.io.InputStream is) throws java.io.IOException
ClassReader
object.
is
- an input stream from which to read the class.
java.io.IOException
- if a problem occurs during reading.public ClassReader(java.lang.String name) throws java.io.IOException
ClassReader
object.
name
- the fully qualified name of the class to be read.
java.io.IOException
- if an exception occurs during reading.Method Detail |
---|
void copyPool(ClassWriter classWriter)
ClassWriter
. Should
be called before the accept(ClassVisitor,boolean)
method.
classWriter
- the ClassWriter
to copy constant pool into.private static byte[] readClass(java.io.InputStream is) throws java.io.IOException
is
- an input stream from which to read the class.
java.io.IOException
- if a problem occurs during reading.public void accept(ClassVisitor classVisitor, boolean skipDebug)
ClassReader
.
This class is the one specified in the constructor (see
ClassReader
).
classVisitor
- the visitor that must visit this class.skipDebug
- true if the debug information of the class
must not be visited. In this case the
visitLocalVariable
and
visitLineNumber
methods will
not be called.public void accept(ClassVisitor classVisitor, Attribute[] attrs, boolean skipDebug)
ClassReader
.
This class is the one specified in the constructor (see
ClassReader
).
classVisitor
- the visitor that must visit this class.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 be ignored.skipDebug
- true if the debug information of the class
must not be visited. In this case the
visitLocalVariable
and
visitLineNumber
methods will
not be called.private void readParameterAnnotations(int v, char[] buf, boolean visible, MethodVisitor mv)
v
- start offset in b
of the annotations to be read.buf
- buffer to be used to call readUTF8
,
readClass
or
readConst
.visible
- true if the annotations to be read are visible
at runtime.mv
- the visitor that must visit the annotations.private int readAnnotationValues(int v, char[] buf, AnnotationVisitor av)
v
- the start offset in b
of the values to be read
(including the unsigned short that gives the number of values).buf
- buffer to be used to call readUTF8
,
readClass
or
readConst
.av
- the visitor that must visit the values.
private int readAnnotationValue(int v, char[] buf, java.lang.String name, AnnotationVisitor av)
v
- the start offset in b
of the value to be read (not
including the value name constant pool index).buf
- buffer to be used to call readUTF8
,
readClass
or
readConst
.name
- the name of the value to be read.av
- the visitor that must visit the value.
private Attribute readAttribute(Attribute[] attrs, java.lang.String type, int off, int len, char[] buf, int codeOff, Label[] labels)
b
.
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
Attribute
instance is returned).type
- the type of the attribute.off
- index of the first byte of the attribute's content in
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).len
- the length of the attribute's content.buf
- buffer to be used to call readUTF8
,
readClass
or
readConst
.codeOff
- index of the first byte of code's attribute content in
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.labels
- the labels of the method's code, or null if the
attribute to be read is not a code attribute.
public int getItem(int item)
b
, plus
one. This method is intended for Attribute
sub classes, and is
normally not needed by class generators or adapters.
item
- the index a constant pool item.
b
, plus
one.public int readByte(int index)
b
. This method is intended for
Attribute
sub classes, and is normally not needed by class
generators or adapters.
index
- the start index of the value to be read in b
.
public int readUnsignedShort(int index)
b
. This method is
intended for Attribute
sub classes, and is normally not needed by
class generators or adapters.
index
- the start index of the value to be read in b
.
public short readShort(int index)
b
. This method is intended
for Attribute
sub classes, and is normally not needed by class
generators or adapters.
index
- the start index of the value to be read in b
.
public int readInt(int index)
b
. This method is intended for
Attribute
sub classes, and is normally not needed by class
generators or adapters.
index
- the start index of the value to be read in b
.
public long readLong(int index)
b
. This method is intended
for Attribute
sub classes, and is normally not needed by class
generators or adapters.
index
- the start index of the value to be read in b
.
public java.lang.String readUTF8(int index, char[] buf)
b
. This method
is intended for Attribute
sub classes, and is normally not needed
by class generators or adapters.
index
- the start index of an unsigned short value in b
,
whose value is the index of an UTF8 constant pool item.buf
- buffer to be used to read the item. This buffer must be
sufficiently large. It is not automatically resized.
private java.lang.String readUTF(int index, int utfLen, char[] buf)
b
.
index
- start offset of the UTF8 string to be read.utfLen
- length of the UTF8 string to be read.buf
- buffer to be used to read the string. This buffer must be
sufficiently large. It is not automatically resized.
public java.lang.String readClass(int index, char[] buf)
b
. This method is
intended for Attribute
sub classes, and is normally not needed by
class generators or adapters.
index
- the start index of an unsigned short value in b
,
whose value is the index of a class constant pool item.buf
- buffer to be used to read the item. This buffer must be
sufficiently large. It is not automatically resized.
public java.lang.Object readConst(int item, char[] buf)
b
. This
method is intended for Attribute
sub classes, and is normally not
needed by class generators or adapters.
item
- the index of a constant pool item.buf
- buffer to be used to read the item. This buffer must be
sufficiently large. It is not automatically resized.
Integer
, Float
, Long
,
Double
, String
or Type
corresponding to
the given constant pool item.
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