programclasswriter.java

ProGuard 是一个免费的 Java类文件的压缩

        }


        public void visitCodeAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute)
        {
            // Write the stack size and local variable frame size.
            dataOutput.writeShort(codeAttribute.u2maxStack);
            dataOutput.writeShort(codeAttribute.u2maxLocals);

            // Write the byte code.
            dataOutput.writeInt(codeAttribute.u4codeLength);

            dataOutput.write(codeAttribute.code, 0, codeAttribute.u4codeLength);

            // Write the exceptions.
            dataOutput.writeShort(codeAttribute.u2exceptionTableLength);

            codeAttribute.exceptionsAccept(clazz, method, this);

            // Write the code attributes.
            dataOutput.writeShort(codeAttribute.u2attributesCount);

            codeAttribute.attributesAccept(clazz, method, ProgramClassWriter.this);
        }


        public void visitStackMapAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute, StackMapAttribute stackMapAttribute)
        {
            // Write the stack map frames (only full frames, without tag).
            dataOutput.writeShort(stackMapAttribute.u2stackMapFramesCount);

            stackMapAttribute.stackMapFramesAccept(clazz, method, codeAttribute, stackMapFrameBodyWriter);
        }


        public void visitStackMapTableAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute, StackMapTableAttribute stackMapTableAttribute)
        {
            // Write the stack map frames.
            dataOutput.writeShort(stackMapTableAttribute.u2stackMapFramesCount);

            stackMapTableAttribute.stackMapFramesAccept(clazz, method, codeAttribute, this);
        }


        public void visitLineNumberTableAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute, LineNumberTableAttribute lineNumberTableAttribute)
        {
            // Write the line numbers.
            dataOutput.writeShort(lineNumberTableAttribute.u2lineNumberTableLength);

            lineNumberTableAttribute.lineNumbersAccept(clazz, method, codeAttribute, this);
        }


        public void visitLocalVariableTableAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute, LocalVariableTableAttribute localVariableTableAttribute)
        {
            // Write the local variables.
            dataOutput.writeShort(localVariableTableAttribute.u2localVariableTableLength);

            localVariableTableAttribute.localVariablesAccept(clazz, method, codeAttribute, this);
        }


        public void visitLocalVariableTypeTableAttribute(Clazz clazz, Method method, CodeAttribute codeAttribute, LocalVariableTypeTableAttribute localVariableTypeTableAttribute)
        {
            // Write the local variable types.
            dataOutput.writeShort(localVariableTypeTableAttribute.u2localVariableTypeTableLength);

            localVariableTypeTableAttribute.localVariablesAccept(clazz, method, codeAttribute, this);
        }


        public void visitAnyAnnotationsAttribute(Clazz clazz, AnnotationsAttribute annotationsAttribute)
        {
            // Write the annotations.
            dataOutput.writeShort(annotationsAttribute.u2annotationsCount);

            annotationsAttribute.annotationsAccept(clazz, this);
        }


        public void visitAnyParameterAnnotationsAttribute(Clazz clazz, Method method, ParameterAnnotationsAttribute parameterAnnotationsAttribute)
        {
            // Write the parameter annotations.
            dataOutput.writeByte(parameterAnnotationsAttribute.u2parametersCount);

            for (int parameterIndex = 0; parameterIndex < parameterAnnotationsAttribute.u2parametersCount; parameterIndex++)
            {
                // Write the parameter annotations of the given parameter.
                Annotation[] annotations = parameterAnnotationsAttribute.parameterAnnotations[parameterIndex];

                int u2annotationsCount = annotations.length;
                dataOutput.writeShort(u2annotationsCount);

                for (int index = 0; index < u2annotationsCount; index++)
                {
                    Annotation annotation = annotations[index];
                    this.visitAnnotation(clazz, annotation);
                }

            }
        }


        public void visitAnnotationDefaultAttribute(Clazz clazz, Method method, AnnotationDefaultAttribute annotationDefaultAttribute)
        {
            // Write the default element value.
            annotationDefaultAttribute.defaultValue.accept(clazz, null, this);
        }


        // Implementations for InnerClassesInfoVisitor.

        public void visitInnerClassesInfo(Clazz clazz, InnerClassesInfo innerClassesInfo)
        {
            dataOutput.writeShort(innerClassesInfo.u2innerClassIndex);
            dataOutput.writeShort(innerClassesInfo.u2outerClassIndex);
            dataOutput.writeShort(innerClassesInfo.u2innerNameIndex);
            dataOutput.writeShort(innerClassesInfo.u2innerClassAccessFlags);
        }


        // Implementations for ExceptionInfoVisitor.

        public void visitExceptionInfo(Clazz clazz, Method method, CodeAttribute codeAttribute, ExceptionInfo exceptionInfo)
        {
            dataOutput.writeShort(exceptionInfo.u2startPC);
            dataOutput.writeShort(exceptionInfo.u2endPC);
            dataOutput.writeShort(exceptionInfo.u2handlerPC);
            dataOutput.writeShort(exceptionInfo.u2catchType);
        }


        // Implementations for StackMapFrameVisitor.

        public void visitAnyStackMapFrame(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, StackMapFrame stackMapFrame)
        {
            // Write the stack map frame tag.
            dataOutput.writeByte(stackMapFrame.getTag());

            // Write the actual body.
            stackMapFrame.accept(clazz, method, codeAttribute, offset, stackMapFrameBodyWriter);
        }


        // Implementations for LineNumberInfoVisitor.

        public void visitLineNumberInfo(Clazz clazz, Method method, CodeAttribute codeAttribute, LineNumberInfo lineNumberInfo)
        {
            dataOutput.writeShort(lineNumberInfo.u2startPC);
            dataOutput.writeShort(lineNumberInfo.u2lineNumber);
        }


        // Implementations for LocalVariableInfoVisitor.

        public void visitLocalVariableInfo(Clazz clazz, Method method, CodeAttribute codeAttribute, LocalVariableInfo localVariableInfo)
        {
            dataOutput.writeShort(localVariableInfo.u2startPC);
            dataOutput.writeShort(localVariableInfo.u2length);
            dataOutput.writeShort(localVariableInfo.u2nameIndex);
            dataOutput.writeShort(localVariableInfo.u2descriptorIndex);
            dataOutput.writeShort(localVariableInfo.u2index);
        }


        // Implementations for LocalVariableTypeInfoVisitor.

        public void visitLocalVariableTypeInfo(Clazz clazz, Method method, CodeAttribute codeAttribute, LocalVariableTypeInfo localVariableTypeInfo)
        {
            dataOutput.writeShort(localVariableTypeInfo.u2startPC);
            dataOutput.writeShort(localVariableTypeInfo.u2length);
            dataOutput.writeShort(localVariableTypeInfo.u2nameIndex);
            dataOutput.writeShort(localVariableTypeInfo.u2signatureIndex);
            dataOutput.writeShort(localVariableTypeInfo.u2index);
        }


        // Implementations for AnnotationVisitor.

        public void visitAnnotation(Clazz clazz, Annotation annotation)
        {
            // Write the annotation type.
            dataOutput.writeShort(annotation.u2typeIndex);

            // Write the element value pairs.
            dataOutput.writeShort(annotation.u2elementValuesCount);

            annotation.elementValuesAccept(clazz, this);
        }


        // Implementations for ElementValueVisitor.

        public void visitAnyElementValue(Clazz clazz, Annotation annotation, ElementValue elementValue)
        {
            // Write the element name index, if applicable.
            int u2elementNameIndex = elementValue.u2elementNameIndex;
            if (u2elementNameIndex != 0)
            {
                dataOutput.writeShort(u2elementNameIndex);
            }

            // Write the tag.
            dataOutput.writeByte(elementValue.getTag());

            // Write the actual body.
            elementValue.accept(clazz, annotation, elementValueBodyWriter);
        }
    }


    private class StackMapFrameBodyWriter
    extends       SimplifiedVisitor
    implements    StackMapFrameVisitor,
                  VerificationTypeVisitor
    {
        public void visitSameZeroFrame(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, SameZeroFrame sameZeroFrame)
        {
            if (sameZeroFrame.getTag() == StackMapFrame.SAME_ZERO_FRAME_EXTENDED)
            {
                dataOutput.writeShort(sameZeroFrame.u2offsetDelta);
            }
        }


        public void visitSameOneFrame(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, SameOneFrame sameOneFrame)
        {
            if (sameOneFrame.getTag() == StackMapFrame.SAME_ONE_FRAME_EXTENDED)
            {
                dataOutput.writeShort(sameOneFrame.u2offsetDelta);
            }

            // Write the verification type of the stack entry.
            sameOneFrame.stackItemAccept(clazz, method, codeAttribute, offset, this);
        }


        public void visitLessZeroFrame(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, LessZeroFrame lessZeroFrame)
        {
            dataOutput.writeShort(lessZeroFrame.u2offsetDelta);
        }


        public void visitMoreZeroFrame(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, MoreZeroFrame moreZeroFrame)
        {
            dataOutput.writeShort(moreZeroFrame.u2offsetDelta);

            // Write the verification types of the additional local variables.
            moreZeroFrame.additionalVariablesAccept(clazz, method, codeAttribute, offset, this);
        }


        public void visitFullFrame(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, FullFrame fullFrame)
        {
            dataOutput.writeShort(fullFrame.u2offsetDelta);

            // Write the verification types of the local variables.
            dataOutput.writeShort(fullFrame.variablesCount);
            fullFrame.variablesAccept(clazz, method, codeAttribute, offset, this);

            // Write the verification types of the stack entries.
            dataOutput.writeShort(fullFrame.stackCount);
            fullFrame.stackAccept(clazz, method, codeAttribute, offset, this);
        }


        // Implementations for VerificationTypeVisitor.

        public void visitAnyVerificationType(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, VerificationType verificationType)
        {
            // Write the verification type tag.
            dataOutput.writeByte(verificationType.getTag());

            // Write the actual body.
            verificationType.accept(clazz, method, codeAttribute, offset, verificationTypeBodyWriter);
        }
    }


    private class VerificationTypeBodyWriter
    extends       SimplifiedVisitor
    implements    VerificationTypeVisitor
    {
        // Implementations for VerificationTypeVisitor.

        public void visitAnyVerificationType(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, VerificationType verificationType)
        {
            // Most verification types don't contain any additional information.
        }


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


        public void visitUninitializedType(Clazz clazz, Method method, CodeAttribute codeAttribute, int offset, UninitializedType uninitializedType)
        {
            dataOutput.writeShort(uninitializedType.u2newInstructionOffset);
        }
    }


    private class ElementValueBodyWriter
    extends       SimplifiedVisitor
    implements    ElementValueVisitor
    {
        // Implementations for ElementValueVisitor.

        public void visitConstantElementValue(Clazz clazz, Annotation annotation, ConstantElementValue constantElementValue)
        {
            dataOutput.writeShort(constantElementValue.u2constantValueIndex);
        }


        public void visitEnumConstantElementValue(Clazz clazz, Annotation annotation, EnumConstantElementValue enumConstantElementValue)
        {
            dataOutput.writeShort(enumConstantElementValue.u2typeNameIndex);
            dataOutput.writeShort(enumConstantElementValue.u2constantNameIndex);
        }


        public void visitClassElementValue(Clazz clazz, Annotation annotation, ClassElementValue classElementValue)
        {
            dataOutput.writeShort(classElementValue.u2classInfoIndex);
        }


        public void visitAnnotationElementValue(Clazz clazz, Annotation annotation, AnnotationElementValue annotationElementValue)
        {
            // Write the annotation.
            attributeBodyWriter.visitAnnotation(clazz, annotationElementValue.annotationValue);
        }


        public void visitArrayElementValue(Clazz clazz, Annotation annotation, ArrayElementValue arrayElementValue)
        {
            // Write the element values.
            dataOutput.writeShort(arrayElementValue.u2elementValuesCount);

            arrayElementValue.elementValuesAccept(clazz, annotation, attributeBodyWriter);
        }
    }
}