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Oracle Fusion Middleware Java API Reference for Oracle TopLink 11g Release 1 (11.1.1) B32476-03 |
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java.lang.Object oracle.toplink.libraries.asm.util.PrintClassVisitor oracle.toplink.libraries.asm.util.TraceClassVisitor
public class TraceClassVisitor
A PrintClassVisitor
that prints a disassembled
view of the classes it visits. This class visitor can be used alone (see the
main
method) to disassemble a class. It can also be used in
the middle of class visitor chain to trace the class that is visited at a
given point in this chain. This may be uselful for debugging purposes.
The trace printed when visiting the Hello class is the following:
where Hello is defined by:// compiled from Hello.java public class Hello { public static main ([Ljava/lang/String;)V GETSTATIC java/lang/System out Ljava/io/PrintStream; LDC "hello" INVOKEVIRTUAL java/io/PrintStream println (Ljava/lang/String;)V RETURN MAXSTACK = 2 MAXLOCALS = 1 public <init> ()V ALOAD 0 INVOKESPECIAL java/lang/Object <init> ()V RETURN MAXSTACK = 1 MAXLOCALS = 1 }
public class Hello { public static void main (String[] args) { System.out.println("hello"); } }
Constructor Summary | |
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TraceClassVisitor(ClassVisitor cv,
java.io.PrintWriter pw)
Constructs a new TraceClassVisitor object. |
Method Summary | |
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static void |
main(java.lang.String[] args)
Prints a disassembled view of the given class to the standard output. |
void |
visit(int version,
int access,
java.lang.String name,
java.lang.String superName,
java.lang.String[] interfaces,
java.lang.String sourceFile)
Visits the header of the class. |
void |
visitAttribute(Attribute attr)
Visits a non standard attribute of the class. |
void |
visitEnd()
Visits the end of the class. |
void |
visitField(int access,
java.lang.String name,
java.lang.String desc,
java.lang.Object value,
Attribute attrs)
Visits a field of the class. |
void |
visitInnerClass(java.lang.String name,
java.lang.String outerName,
java.lang.String innerName,
int access)
Visits information about an inner class. |
CodeVisitor |
visitMethod(int access,
java.lang.String name,
java.lang.String desc,
java.lang.String[] exceptions,
Attribute attrs)
Visits a method of the class. |
Methods inherited from class oracle.toplink.libraries.asm.util.PrintClassVisitor |
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getDefaultAttributes |
Methods inherited from class java.lang.Object |
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equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public TraceClassVisitor(ClassVisitor cv, java.io.PrintWriter pw)
TraceClassVisitor
object.
cv
- the class visitor to which this adapter must delegate calls. May
be null.pw
- the print writer to be used to print the class.Method Detail |
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public static void main(java.lang.String[] args) throws java.lang.Exception
Usage: TraceClassVisitor [-debug] <fully qualified class name or class file name >
args
- the command line arguments.
java.lang.Exception
- if the class cannot be found, or if an IO exception
occurs.public void visit(int version, int access, java.lang.String name, java.lang.String superName, java.lang.String[] interfaces, java.lang.String sourceFile)
version
- the class version.access
- the class's access flags (see Constants
). This
parameter also indicates if the class is deprecated.name
- the internal name of the class (see getInternalName
).superName
- the internal of name of the super class (see getInternalName
). For interfaces, the super
class is Object
. May be null, but only for the java.lang.Object
class.interfaces
- the internal names of the class's interfaces (see getInternalName
). May be null.sourceFile
- the name of the source file from which this class was
compiled. May be null.public void visitInnerClass(java.lang.String name, java.lang.String outerName, java.lang.String innerName, int access)
name
- the internal name of an inner class (see getInternalName
).outerName
- the internal name of the class to which the inner class
belongs (see getInternalName
). May be
null.innerName
- the (simple) name of the inner class inside its enclosing
class. May be null for anonymous inner classes.access
- the access flags of the inner class as originally declared
in the enclosing class.public void visitField(int access, java.lang.String name, java.lang.String desc, java.lang.Object value, Attribute attrs)
access
- the field's access flags (see Constants
). This
parameter also indicates if the field is synthetic and/or deprecated.name
- the field's name.desc
- the field's descriptor (see Type
).value
- the field's initial value. This parameter, which may be
null if the field does not have an initial value, must be an
Integer
, a Float
, a
Long
, a Double
or a
String
(for int, float, long
or String fields respectively). This parameter is only
used for static fields. Its value is ignored for non static
fields, which must be initialized through bytecode instructions in
constructors or methods.attrs
- the non standard method attributes, linked together by their
next field. May be null.public CodeVisitor visitMethod(int access, java.lang.String name, java.lang.String desc, java.lang.String[] exceptions, Attribute attrs)
CodeVisitor
instance (or null) each time it
is called, i.e., it should not return a previously returned visitor.
access
- the method's access flags (see Constants
). This
parameter also indicates if the method is synthetic and/or deprecated.name
- the method's name.desc
- the method's descriptor (see Type
).exceptions
- the internal names of the method's exception
classes (see getInternalName
). May be
null.attrs
- the non standard method attributes, linked together by their
next field. May be null.
public void visitAttribute(Attribute attr)
attr
- a non standard class attribute. Must not be null.public void visitEnd()
visitEnd
in interface ClassVisitor
visitEnd
in class PrintClassVisitor
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