程序包 org.babyfish.jimmer.impl.asm

类 Attribute

java.lang.Object
org.babyfish.jimmer.impl.asm.Attribute
public class Attribute extends Object
A non standard class, field, method or Code attribute, as defined in the Java Virtual Machine Specification (JVMS).
另请参阅:

  • 字段概要

    字段
    修饰符和类型
    字段
    说明
    final String
    type
    The type of this attribute, also called its name in the JVMS.

  • 构造器概要

    构造器
    限定符
    构造器
    说明
    protected
    Attribute(String type)
    Constructs a new empty attribute.

  • 方法概要

    修饰符和类型
    方法
    说明
    protected Label[]
    getLabels()
    Returns the labels corresponding to this attribute.
    boolean
    isCodeAttribute()
    Returns true if this type of attribute is a Code attribute.
    boolean
    isUnknown()
    Returns true if this type of attribute is unknown.
    protected Attribute
    read(ClassReader classReader, int offset, int length, char[] charBuffer, int codeAttributeOffset, Label[] labels)
    Reads a type attribute.
    protected ByteVector
    write(ClassWriter classWriter, byte[] code, int codeLength, int maxStack, int maxLocals)
    Returns the byte array form of the content of this attribute.

    从类继承的方法 java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • 字段详细资料

    • type

      public final String type
      The type of this attribute, also called its name in the JVMS.

  • 构造器详细资料

    • Attribute

      protected Attribute(String type)
      Constructs a new empty attribute.
      参数:
      type - the type of the attribute.

  • 方法详细资料

    • isUnknown

      public boolean isUnknown()
      Returns true if this type of attribute is unknown. This means that the attribute content can't be parsed to extract constant pool references, labels, etc. Instead, the attribute content is read as an opaque byte array, and written back as is. This can lead to invalid attributes, if the content actually contains constant pool references, labels, or other symbolic references that need to be updated when there are changes to the constant pool, the method bytecode, etc. The default implementation of this method always returns true.
      返回:
      true if this type of attribute is unknown.

    • isCodeAttribute

      public boolean isCodeAttribute()
      Returns true if this type of attribute is a Code attribute.
      返回:
      true if this type of attribute is a Code attribute.

    • getLabels

      protected Label[] getLabels()
      Returns the labels corresponding to this attribute.
      返回:
      the labels corresponding to this attribute, or null if this attribute is not a Code attribute that contains labels.

    • read

      protected Attribute read(ClassReader classReader, int offset, int length, char[] charBuffer, int codeAttributeOffset, Label[] labels)
      Reads a type attribute. This method must return a new Attribute object, of type type, corresponding to the 'length' bytes starting at 'offset', in the given ClassReader.
      参数:
      classReader - the class that contains the attribute to be read.
      offset - index of the first byte of the attribute's content in ClassReader. The 6 attribute header bytes (attribute_name_index and attribute_length) are not taken into account here.
      length - the length of the attribute's content (excluding the 6 attribute header bytes).
      charBuffer - the buffer to be used to call the ClassReader methods requiring a 'charBuffer' parameter.
      codeAttributeOffset - index of the first byte of content of the enclosing Code attribute in ClassReader, or -1 if the attribute to be read is not a Code attribute. The 6 attribute header bytes (attribute_name_index and attribute_length) 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.
      返回:
      a new Attribute object corresponding to the specified bytes.

    • write

      protected ByteVector write(ClassWriter classWriter, byte[] code, int codeLength, int maxStack, int maxLocals)
      Returns the byte array form of the content of this attribute. The 6 header bytes (attribute_name_index and attribute_length) must not be added in the returned ByteVector.
      参数:
      classWriter - the class to which this attribute must be added. This parameter can be used to add the items that corresponds to this attribute to the constant pool of this class.
      code - the bytecode of the method corresponding to this Code attribute, or null if this attribute is not a Code attribute. Corresponds to the 'code' field of the Code attribute.
      codeLength - the length of the bytecode of the method corresponding to this code attribute, or 0 if this attribute is not a Code attribute. Corresponds to the 'code_length' field of the Code attribute.
      maxStack - the maximum stack size of the method corresponding to this Code attribute, or -1 if this attribute is not a Code attribute.
      maxLocals - the maximum number of local variables of the method corresponding to this code attribute, or -1 if this attribute is not a Code attribute.
      返回:
      the byte array form of this attribute.