public final class TraceClassVisitor extends ClassVisitor
ClassVisitor
that prints the classes it visits with a Printer
. This class
visitor can be used in the middle of a class visitor chain to trace the class that is visited at
a given point in this chain. This may be useful for debugging purposes.
When used with a Textifier
, the trace printed when visiting the Hello class
is the following:
// class version 49.0 (49) // access flags 0x21 public class Hello { // compiled from: Hello.java // access flags 0x1 public <init> ()V ALOAD 0 INVOKESPECIAL java/lang/Object <init> ()V RETURN MAXSTACK = 1 MAXLOCALS = 1 // access flags 0x9 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 }where Hello is defined by:
public class Hello { public static void main(String[] args) { System.out.println("hello"); } }
Modifier and Type | Field | Description |
---|---|---|
Printer |
p |
The printer to convert the visited class into text.
|
api, cv
Constructor | Description |
---|---|
TraceClassVisitor(java.io.PrintWriter printWriter) |
Constructs a new
TraceClassVisitor . |
TraceClassVisitor(ClassVisitor classVisitor,
java.io.PrintWriter printWriter) |
Constructs a new
TraceClassVisitor . |
TraceClassVisitor(ClassVisitor classVisitor,
Printer printer,
java.io.PrintWriter printWriter) |
Constructs a new
TraceClassVisitor . |
Modifier and Type | Method | Description |
---|---|---|
void |
visit(int version,
int access,
java.lang.String name,
java.lang.String signature,
java.lang.String superName,
java.lang.String[] interfaces) |
Visits the header of the class.
|
AnnotationVisitor |
visitAnnotation(java.lang.String descriptor,
boolean visible) |
Visits an annotation of the class.
|
void |
visitAttribute(Attribute attribute) |
Visits a non standard attribute of the class.
|
void |
visitEnd() |
Visits the end of the class.
|
FieldVisitor |
visitField(int access,
java.lang.String name,
java.lang.String descriptor,
java.lang.String signature,
java.lang.Object value) |
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.
|
MethodVisitor |
visitMethod(int access,
java.lang.String name,
java.lang.String descriptor,
java.lang.String signature,
java.lang.String[] exceptions) |
Visits a method of the class.
|
ModuleVisitor |
visitModule(java.lang.String name,
int flags,
java.lang.String version) |
Visit the module corresponding to the class.
|
void |
visitNestHostExperimental(java.lang.String nestHost) |
Experimental, use at your own risk.
|
void |
visitNestMemberExperimental(java.lang.String nestMember) |
Experimental, use at your own risk.
|
void |
visitOuterClass(java.lang.String owner,
java.lang.String name,
java.lang.String descriptor) |
Visits the enclosing class of the class.
|
void |
visitSource(java.lang.String file,
java.lang.String debug) |
Visits the source of the class.
|
AnnotationVisitor |
visitTypeAnnotation(int typeRef,
TypePath typePath,
java.lang.String descriptor,
boolean visible) |
Visits an annotation on a type in the class signature.
|
public final Printer p
public TraceClassVisitor(java.io.PrintWriter printWriter)
TraceClassVisitor
.printWriter
- the print writer to be used to print the class. May be null.public TraceClassVisitor(ClassVisitor classVisitor, java.io.PrintWriter printWriter)
TraceClassVisitor
.classVisitor
- the class visitor to which to delegate calls. May be null.printWriter
- the print writer to be used to print the class. May be null.public TraceClassVisitor(ClassVisitor classVisitor, Printer printer, java.io.PrintWriter printWriter)
TraceClassVisitor
.classVisitor
- the class visitor to which to delegate calls. May be null.printer
- the printer to convert the visited class into text.printWriter
- the print writer to be used to print the class. May be null.public void visit(int version, int access, java.lang.String name, java.lang.String signature, java.lang.String superName, java.lang.String[] interfaces)
ClassVisitor
visit
in class ClassVisitor
version
- the class version. The minor version is stored in the 16 most significant bits,
and the major version in the 16 least significant bits.access
- the class's access flags (see Opcodes
). This parameter also indicates if
the class is deprecated.name
- the internal name of the class (see Type.getInternalName()
).signature
- the signature of this class. May be null if the class is not a
generic one, and does not extend or implement generic classes or interfaces.superName
- the internal of name of the super class (see Type.getInternalName()
).
For interfaces, the super class is Object
. May be null, but only for the
Object
class.interfaces
- the internal names of the class's interfaces (see Type.getInternalName()
). May be null.public void visitSource(java.lang.String file, java.lang.String debug)
ClassVisitor
visitSource
in class ClassVisitor
file
- the name of the source file from which the class was compiled. May be
null.debug
- additional debug information to compute the correspondence between source and
compiled elements of the class. May be null.public ModuleVisitor visitModule(java.lang.String name, int flags, java.lang.String version)
ClassVisitor
visitModule
in class ClassVisitor
name
- the fully qualified name (using dots) of the module.flags
- the module access flags, among ACC_OPEN
, ACC_SYNTHETIC
and
ACC_MANDATED
.version
- the module version, or null.public void visitNestHostExperimental(java.lang.String nestHost)
ClassVisitor
visitNestHostExperimental
in class ClassVisitor
nestHost
- the internal name of the host class of the nest.public void visitOuterClass(java.lang.String owner, java.lang.String name, java.lang.String descriptor)
ClassVisitor
visitOuterClass
in class ClassVisitor
owner
- internal name of the enclosing class of the class.name
- the name of the method that contains the class, or null if the class is
not enclosed in a method of its enclosing class.descriptor
- the descriptor of the method that contains the class, or null if the
class is not enclosed in a method of its enclosing class.public AnnotationVisitor visitAnnotation(java.lang.String descriptor, boolean visible)
ClassVisitor
visitAnnotation
in class ClassVisitor
descriptor
- the class descriptor of the annotation class.visible
- true if the annotation is visible at runtime.public AnnotationVisitor visitTypeAnnotation(int typeRef, TypePath typePath, java.lang.String descriptor, boolean visible)
ClassVisitor
visitTypeAnnotation
in class ClassVisitor
typeRef
- a reference to the annotated type. The sort of this type reference must be
TypeReference.CLASS_TYPE_PARAMETER
, TypeReference.CLASS_TYPE_PARAMETER_BOUND
or TypeReference.CLASS_EXTENDS
. See
TypeReference
.typePath
- the path to the annotated type argument, wildcard bound, array element type, or
static inner type within 'typeRef'. May be null if the annotation targets
'typeRef' as a whole.descriptor
- the class descriptor of the annotation class.visible
- true if the annotation is visible at runtime.public void visitAttribute(Attribute attribute)
ClassVisitor
visitAttribute
in class ClassVisitor
attribute
- an attribute.public void visitNestMemberExperimental(java.lang.String nestMember)
ClassVisitor
visitNestMemberExperimental
in class ClassVisitor
nestMember
- the internal name of a nest member.public void visitInnerClass(java.lang.String name, java.lang.String outerName, java.lang.String innerName, int access)
ClassVisitor
visitInnerClass
in class ClassVisitor
name
- the internal name of an inner class (see Type.getInternalName()
).outerName
- the internal name of the class to which the inner class belongs (see Type.getInternalName()
). May be null for not member classes.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 FieldVisitor visitField(int access, java.lang.String name, java.lang.String descriptor, java.lang.String signature, java.lang.Object value)
ClassVisitor
visitField
in class ClassVisitor
access
- the field's access flags (see Opcodes
). This parameter also indicates if
the field is synthetic and/or deprecated.name
- the field's name.descriptor
- the field's descriptor (see Type
).signature
- the field's signature. May be null if the field's type does not use
generic types.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.public MethodVisitor visitMethod(int access, java.lang.String name, java.lang.String descriptor, java.lang.String signature, java.lang.String[] exceptions)
ClassVisitor
MethodVisitor
instance (or null) each time it is called, i.e., it should not return a previously
returned visitor.visitMethod
in class ClassVisitor
access
- the method's access flags (see Opcodes
). This parameter also indicates if
the method is synthetic and/or deprecated.name
- the method's name.descriptor
- the method's descriptor (see Type
).signature
- the method's signature. May be null if the method parameters, return
type and exceptions do not use generic types.exceptions
- the internal names of the method's exception classes (see Type.getInternalName()
). May be null.public void visitEnd()
ClassVisitor
visitEnd
in class ClassVisitor