usagemarker.java

ProGuard 是一个免费的 Java类文件的压缩

        markConstant(clazz, sourceFileAttribute.u2attributeNameIndex);
        markConstant(clazz, sourceFileAttribute.u2sourceFileIndex);
    }


    public void visitSourceDirAttribute(Clazz clazz, SourceDirAttribute sourceDirAttribute)
    {
        markAsUsed(sourceDirAttribute);

        markConstant(clazz, sourceDirAttribute.u2attributeNameIndex);
        markConstant(clazz, sourceDirAttribute.u2sourceDirIndex);
    }


    public void visitInnerClassesAttribute(Clazz clazz, InnerClassesAttribute innerClassesAttribute)
    {
        // Don't mark the attribute and its name yet. We may mark it later, in
        // InnerUsageMarker.
        //markAsUsed(innerClassesAttribute);

        //markConstant(clazz, innerClassesAttribute.u2attrNameIndex);

        // Do mark the outer class entries.
        innerClassesAttribute.innerClassEntriesAccept(clazz, this);
    }


    public void visitEnclosingMethodAttribute(Clazz clazz, EnclosingMethodAttribute enclosingMethodAttribute)
    {
        markAsUsed(enclosingMethodAttribute);

        markConstant(clazz, enclosingMethodAttribute.u2attributeNameIndex);
        markConstant(clazz, enclosingMethodAttribute.u2classIndex);

        if (enclosingMethodAttribute.u2nameAndTypeIndex != 0)
        {
            markConstant(clazz, enclosingMethodAttribute.u2nameAndTypeIndex);
        }
    }


    public void visitDeprecatedAttribute(Clazz clazz, DeprecatedAttribute deprecatedAttribute)
    {
        markAsUsed(deprecatedAttribute);

        markConstant(clazz, deprecatedAttribute.u2attributeNameIndex);
    }


    public void visitSyntheticAttribute(Clazz clazz, SyntheticAttribute syntheticAttribute)
    {
        markAsUsed(syntheticAttribute);

        markConstant(clazz, syntheticAttribute.u2attributeNameIndex);
    }


    public void visitSignatureAttribute(Clazz clazz, SignatureAttribute signatureAttribute)
    {
        markAsUsed(signatureAttribute);

        markConstant(clazz, signatureAttribute.u2attributeNameIndex);
        markConstant(clazz, signatureAttribute.u2signatureIndex);
    }


    public void visitConstantValueAttribute(Clazz clazz, Field field, ConstantValueAttribute constantValueAttribute)
    {
        markAsUsed(constantValueAttribute);

        markConstant(clazz, constantValueAttribute.u2attributeNameIndex);
        markConstant(clazz, constantValueAttribute.u2constantValueIndex);
    }


    public void visitExceptionsAttribute(Clazz clazz, Method method, ExceptionsAttribute exceptionsAttribute)
    {
        markAsUsed(exceptionsAttribute);

        markConstant(clazz, exceptionsAttribute.u2attributeNameIndex);

        // Mark the constant pool entries referenced by the exceptions.
        exceptionsAttribute.exceptionEntriesAccept((ProgramClass)clazz, this);
    }


    public void visitCodeAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute)
    {
        markAsUsed(codeAttribute);

        markConstant(clazz, codeAttribute.u2attributeNameIndex);

        // Mark the constant pool entries referenced by the instructions,
        // by the exceptions, and by the attributes.
        codeAttribute.instructionsAccept(clazz, method, this);
        codeAttribute.exceptionsAccept(clazz, method, this);
        codeAttribute.attributesAccept(clazz, method, this);
    }


    public void visitStackMapAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute, StackMapAttribute stackMapAttribute)
    {
        markAsUsed(stackMapAttribute);

        markConstant(clazz, stackMapAttribute.u2attributeNameIndex);

        // Mark the constant pool entries referenced by the stack map frames.
        stackMapAttribute.stackMapFramesAccept(clazz, method, codeAttribute, this);
    }


    public void visitStackMapTableAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute, StackMapTableAttribute stackMapTableAttribute)
    {
        markAsUsed(stackMapTableAttribute);

        markConstant(clazz, stackMapTableAttribute.u2attributeNameIndex);

        // Mark the constant pool entries referenced by the stack map frames.
        stackMapTableAttribute.stackMapFramesAccept(clazz, method, codeAttribute, this);
    }


    public void visitLineNumberTableAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute, LineNumberTableAttribute lineNumberTableAttribute)
    {
        markAsUsed(lineNumberTableAttribute);

        markConstant(clazz, lineNumberTableAttribute.u2attributeNameIndex);
    }


    public void visitLocalVariableTableAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute, LocalVariableTableAttribute localVariableTableAttribute)
    {
        markAsUsed(localVariableTableAttribute);

        markConstant(clazz, localVariableTableAttribute.u2attributeNameIndex);

        // Mark the constant pool entries referenced by the local variables.
        localVariableTableAttribute.localVariablesAccept(clazz, method, codeAttribute, this);
    }


    public void visitLocalVariableTypeTableAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute, LocalVariableTypeTableAttribute localVariableTypeTableAttribute)
    {
        markAsUsed(localVariableTypeTableAttribute);

        markConstant(clazz, localVariableTypeTableAttribute.u2attributeNameIndex);

        // Mark the constant pool entries referenced by the local variable types.
        localVariableTypeTableAttribute.localVariablesAccept(clazz, method, codeAttribute, this);
    }


    public void visitAnyAnnotationsAttribute(Clazz clazz, AnnotationsAttribute annotationsAttribute)
    {
        // Don't mark the attribute and its contents yet. We may mark them later,
        // in AnnotationUsageMarker.
//        markAsUsed(annotationsAttribute);
//
//        markConstant(clazz, annotationsAttribute.u2attributeNameIndex);
//
//        // Mark the constant pool entries referenced by the annotations.
//        annotationsAttribute.annotationsAccept(clazz, this);
    }


    public void visitAnyParameterAnnotationsAttribute(Clazz clazz, Method method, ParameterAnnotationsAttribute parameterAnnotationsAttribute)
    {
        // Don't mark the attribute and its contents yet. We may mark them later,
        // in AnnotationUsageMarker.
//        markAsUsed(parameterAnnotationsAttribute);
//
//        markConstant(clazz, parameterAnnotationsAttribute.u2attributeNameIndex);
//
//        // Mark the constant pool entries referenced by the annotations.
//        parameterAnnotationsAttribute.annotationsAccept(clazz, method, this);
    }


    public void visitAnnotationDefaultAttribute(Clazz clazz, Method method, AnnotationDefaultAttribute annotationDefaultAttribute)
    {
        // Don't mark the attribute and its contents yet. We may mark them later,
        // in AnnotationUsageMarker.
//        markAsUsed(annotationDefaultAttribute);
//
//        markConstant(clazz, annotationDefaultAttribute.u2attributeNameIndex);
//
//        // Mark the constant pool entries referenced by the element value.
//        annotationDefaultAttribute.defaultValueAccept(clazz, this);
    }


    // Implementations for ExceptionInfoVisitor.

    public void visitExceptionInfo(Clazz clazz, Method method, CodeAttribute codeAttribute, ExceptionInfo exceptionInfo)
    {
        markAsUsed(exceptionInfo);

        if (exceptionInfo.u2catchType != 0)
        {
            markConstant(clazz, exceptionInfo.u2catchType);
        }
    }


    // Implementations for InnerClassesInfoVisitor.

    public void visitInnerClassesInfo(Clazz clazz, InnerClassesInfo innerClassesInfo)
    {
        // At this point, we only mark outer classes of this class.
        // Inner class can be marked later, by InnerUsageMarker.
        if (innerClassesInfo.u2innerClassIndex == 0 &&
            clazz.getName().equals(clazz.getClassName(innerClassesInfo.u2innerClassIndex)))
        {
            markAsUsed(innerClassesInfo);

            if (innerClassesInfo.u2innerClassIndex != 0)
            {
                markConstant(clazz, innerClassesInfo.u2innerClassIndex);
            }

            if (innerClassesInfo.u2outerClassIndex != 0)
            {
                markConstant(clazz, innerClassesInfo.u2outerClassIndex);
            }

            if (innerClassesInfo.u2innerNameIndex != 0)
            {
                markConstant(clazz, innerClassesInfo.u2innerNameIndex);
            }
        }
    }


    // Implementations for StackMapFrameVisitor.

    public void visitAnyStackMapFrame(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, StackMapFrame stackMapFrame) {}


    public void visitSameOneFrame(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, SameOneFrame sameOneFrame)
    {
        // Mark the constant pool entries referenced by the verification types.
        sameOneFrame.stackItemAccept(clazz, method, codeAttribute, offset, this);
    }


    public void visitMoreZeroFrame(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, MoreZeroFrame moreZeroFrame)
    {
        // Mark the constant pool entries referenced by the verification types.
        moreZeroFrame.additionalVariablesAccept(clazz, method, codeAttribute, offset, this);
    }


    public void visitFullFrame(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, FullFrame fullFrame)
    {
        // Mark the constant pool entries referenced by the verification types.
        fullFrame.variablesAccept(clazz, method, codeAttribute, offset, this);
        fullFrame.stackAccept(clazz, method, codeAttribute, offset, this);
    }


    // Implementations for VerificationTypeVisitor.

    public void visitAnyVerificationType(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, VerificationType verificationType) {}


    public void visitObjectType(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, ObjectType objectType)
    {
        markConstant(clazz, objectType.u2classIndex);
    }


    // Implementations for LocalVariableInfoVisitor.

    public void visitLocalVariableInfo(Clazz clazz, Method method, CodeAttribute codeAttribute, LocalVariableInfo localVariableInfo)
    {
        markConstant(clazz, localVariableInfo.u2nameIndex);
        markConstant(clazz, localVariableInfo.u2descriptorIndex);
    }


    // Implementations for LocalVariableTypeInfoVisitor.

    public void visitLocalVariableTypeInfo(Clazz clazz, Method method, CodeAttribute codeAttribute, LocalVariableTypeInfo localVariableTypeInfo)
    {
        markConstant(clazz, localVariableTypeInfo.u2nameIndex);
        markConstant(clazz, localVariableTypeInfo.u2signatureIndex);
    }


    // Implementations for AnnotationVisitor.

    public void visitAnnotation(Clazz clazz, Annotation annotation)
    {
        markConstant(clazz, annotation.u2typeIndex);

        // Mark the constant pool entries referenced by the element values.
        annotation.elementValuesAccept(clazz, this);
    }


    // Implementations for ElementValueVisitor.

    public void visitConstantElementValue(Clazz clazz, Annotation annotation, ConstantElementValue constantElementValue)
    {
        if (constantElementValue.u2elementNameIndex != 0)
        {
            markConstant(clazz, constantElementValue.u2elementNameIndex);
        }

        markConstant(clazz, constantElementValue.u2constantValueIndex);
    }


    public void visitEnumConstantElementValue(Clazz clazz, Annotation annotation, EnumConstantElementValue enumConstantElementValue)
    {
        if (enumConstantElementValue.u2elementNameIndex != 0)
        {
            markConstant(clazz, enumConstantElementValue.u2elementNameIndex);
        }

        markConstant(clazz, enumConstantElementValue.u2typeNameIndex);
        markConstant(clazz, enumConstantElementValue.u2constantNameIndex);
    }


    public void visitClassElementValue(Clazz clazz, Annotation annotation, ClassElementValue classElementValue)
    {
        if (classElementValue.u2elementNameIndex != 0)
        {
            markConstant(clazz, classElementValue.u2elementNameIndex);
        }

        // Mark the referenced class constant pool entry.
        markConstant(clazz, classElementValue.u2classInfoIndex);
    }


    public void visitAnnotationElementValue(Clazz clazz, Annotation annotation, AnnotationElementValue annotationElementValue)
    {
        if (annotationElementValue.u2elementNameIndex != 0)
        {
            markConstant(clazz, annotationElementValue.u2elementNameIndex);
        }

        // Mark the constant pool entries referenced by the annotation.
        annotationElementValue.annotationAccept(clazz, this);
    }


    public void visitArrayElementValue(Clazz clazz, Annotation annotation, ArrayElementValue arrayElementValue)
    {
        if (arrayElementValue.u2elementNameIndex != 0)
        {
            markConstant(clazz, arrayElementValue.u2elementNameIndex);
        }

        // Mark the constant pool entries referenced by the element values.
        arrayElementValue.elementValuesAccept(clazz, annotation, this);
    }


    // Implementations for InstructionVisitor.

    public void visitAnyInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, Instruction instruction) {}


    public void visitConstantInstruction(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, ConstantInstruction constantInstruction)
    {
        markConstant(clazz, constantInstruction.constantIndex);
    }


    // Small utility methods.

    /**
     * Marks the given visitor accepter as being used.
     */
    protected void markAsUsed(VisitorAccepter visitorAccepter)
    {
        visitorAccepter.setVisitorInfo(USED);
    }


    /**
     * Returns whether the given visitor accepter should still be marked as
     * being used.
     */
    protected boolean shouldBeMarkedAsUsed(VisitorAccepter visitorAccepter)
    {
        return visitorAccepter.getVisitorInfo() != USED;
    }


    /**
     * Returns whether the given visitor accepter has been marked as being used.
     */
    protected boolean isUsed(VisitorAccepter visitorAccepter)
    {
        return visitorAccepter.getVisitorInfo() == USED;
    }


    /**
     * Marks the given visitor accepter as possibly being used.
     */
    protected void markAsPossiblyUsed(VisitorAccepter visitorAccepter)
    {
        visitorAccepter.setVisitorInfo(POSSIBLY_USED);
    }


    /**
     * Returns whether the given visitor accepter should still be marked as
     * possibly being used.
     */
    protected boolean shouldBeMarkedAsPossiblyUsed(VisitorAccepter visitorAccepter)
    {
        return visitorAccepter.getVisitorInfo() != USED &&
               visitorAccepter.getVisitorInfo() != POSSIBLY_USED;
    }


    /**
     * Returns whether the given visitor accepter has been marked as possibly
     * being used.
     */
    protected boolean isPossiblyUsed(VisitorAccepter visitorAccepter)
    {
        return visitorAccepter.getVisitorInfo() == POSSIBLY_USED;
    }


    /**
     * Clears any usage marks from the given visitor accepter.
     */
    protected void markAsUnused(VisitorAccepter visitorAccepter)
    {
        visitorAccepter.setVisitorInfo(null);
    }


    /**
     * Marks the given constant pool entry of the given class. This includes
     * visiting any referenced objects.
     */
    private void markConstant(Clazz clazz, int index)
    {
         clazz.constantPoolEntryAccept(index, this);
    }
}