Module: JavaClass

Defined in:
lib/javaclass/base.rb,
lib/javaclass/class.rb,
lib/javaclass/member.rb,
lib/javaclass/reader.rb,
lib/javaclass/constant.rb,
lib/javaclass/attribute.rb,
lib/javaclass/accessflag.rb

Defined Under Namespace

Modules: Base, ConstantFactory, Converters, Item Classes: AccessFlag, Annotation, AnnotationAnnotationElementValue, AnnotationDefaultAttribute, AnnotationElement, AnnotationElementValue, AnnotationsAttribute, ArrayAnnotationElementValue, ArrayIO, Attribute, Class, ClassAccessFlag, ClassAnnotationElementValue, ClassConstant, CodeAttribute, ConstAnnotationElementValue, Constant, ConstantValueAttribute, DeprecatedAttribute, DoubleConstant, EnclosingMethodAttribute, EnumAnnotationElementValue, ExceptionsAttribute, Excpetion, Field, FieldAccessFlag, FieldRefConstant, FloatConstant, InnerClass, InnerClassAccessFlag, InnerClassesAttribute, IntegerConstant, InterfaceMethodRefConstant, LineNumber, LineNumberTableAttribute, LocalVariable, LocalVariableTableAttribute, LocalVariableType, LocalVariableTypeTableAttribute, LongConstant, Member, MemberRefConstant, Method, MethodAccessFlag, MethodRefConstant, NameAndTypeConstant, ParameterAnnotationsAttribute, SignatureAttribute, SourceDebugExtensionAttribute, SourceFileAttribute, StringConstant, SyntheticAttribute, UTF8Constant

Class Method Summary collapse

Class Method Details

.from(src) ⇒ Object

IOまたはバイト配列からクラスを読み込む。

*io::IOまたはバイト配列。(IO.getc,IO.read(length)が実装されていればOK) 戻り値::クラス



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# File 'lib/javaclass/reader.rb', line 29

def from( src )
  
  if ( src.kind_of?(Array) ) 
    io = ArrayIO.new(src) 
  else
    io = src
  end
  
  # magic
  raise "illegal class data." if read( 4, io ) != 0xCAFEBABE

  java_class = JavaClass::Class.new

  # version
  java_class.minor_version = read( 2, io )
  java_class.major_version = read( 2, io )

  # constant_pool
  constant_pool_count = read( 2, io )
  index = 1
  while( index < constant_pool_count)
    java_class.constant_pool[index] = read_constant(io, java_class)
    # constantがdouble or longの場合、次のindexは欠番。
    tag = java_class.constant_pool[index].tag
    if tag == JavaClass::Constant::CONSTANT_Double \
      || tag == JavaClass::Constant::CONSTANT_Long
      index += 1
    end
    index += 1
  end

  # access_flag
  access_flag = read( 2, io )
  java_class.access_flag = ClassAccessFlag.new(access_flag)

  # class
  java_class.this_class_index  = read( 2, io )
  java_class.super_class_index = read( 2, io )
  interfaces_count = read( 2, io )
  interfaces_count.times{|i|
    java_class.interface_indexs << read( 2, io )
  }

  # field
  fields_count = read( 2, io )
  fields_count.times {|i|
    java_class.fields << read_field( io, java_class )
  }

  # method
  methods_count = read( 2, io )
  methods_count.times {|i|
    java_class.methods << read_method( io, java_class )
  }

  # attribute
  read_attributes(io, java_class, java_class )

  return java_class
end

.read(size, io) ⇒ Object

IOから指定したバイト数だけデータを読み込んで返す

*size::読み込むだバイト数*io::IO 戻り値::データ



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# File 'lib/javaclass/reader.rb', line 127

def read( size, io )
  res = 0
  size.times{|i| res = res << 8 | io.getc }
  return res
end

.read_annotation(io, java_class) ⇒ Object

アノテーションを読み込む

*io::IO *java_class::Javaクラス



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# File 'lib/javaclass/reader.rb', line 348

def read_annotation( io, java_class )
  elements = {}
  type_index = read( 2, io )
  num_element_value_pairs = read( 2, io )
  num_element_value_pairs.times {|i|
    e = read_annotation_element( io, java_class )
    elements[e.name] = e
  }
  return Annotation.new( java_class, type_index, elements )
end

.read_annotation_element(io, java_class) ⇒ Object

アノテーションデータを読み込む

*io::IO *java_class::Javaクラス



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# File 'lib/javaclass/reader.rb', line 365

def read_annotation_element( io, java_class )
  element_name_index = read( 2, io )
  value = read_annotation_element_value( io, java_class )
  return AnnotationElement.new( java_class, element_name_index, value )
end

.read_annotation_element_value(io, java_class) ⇒ Object

アノテーションデータを読み込む

*io::IO *java_class::Javaクラス



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# File 'lib/javaclass/reader.rb', line 377

def read_annotation_element_value( io, java_class )
  tag = read( 1, io )
  value = nil
  case tag.chr
  when 'B', 'C', 'D', 'F', 'I', 'J', 'S', 'Z', 's'
    const_value_index = read( 2, io )
    value = ConstAnnotationElementValue.new( java_class, tag, const_value_index )
  when 'e'
    type_name_index = read( 2, io )
    const_name_index = read( 2, io )
    value = EnumAnnotationElementValue.new( java_class, tag, type_name_index, const_name_index )
  when 'c'
    class_info_index = read( 2, io )
    value = ClassAnnotationElementValue.new( java_class, tag, class_info_index )
  when '@'
    annotation = read_annotation( io, java_class )
    value = AnnotationAnnotationElementValue.new( java_class, tag, annotation )
  when '['
    array = []
    num_values = read( 2, io )
    num_values.times{|i|
      array << read_annotation_element_value( io, java_class )
    }
    value = ArrayAnnotationElementValue.new( java_class, tag, array )
  end
  return value
end

.read_annotations(io, java_class) ⇒ Object

アノテーションを読み込む

*io::IO *java_class::Javaクラス



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# File 'lib/javaclass/reader.rb', line 333

def read_annotations( io, java_class )
  annotations = []
  num_annotations = read( 2, io )
  num_annotations.times {|i|
    annotations << read_annotation( io, java_class )
  }
  return annotations
end

.read_attribute(io, java_class) ⇒ Object

属性を読み込む

*io::IO *java_class::Javaクラス



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# File 'lib/javaclass/reader.rb', line 210

def read_attribute( io, java_class )

  # 名前
  name_index = read( 2, io )
  name   = java_class.get_constant_value( name_index )
  length = read( 4, io )
  attr = nil
  case name
  when "ConstantValue"
    constant_value_index = read( 2, io )
    attr = ConstantValueAttribute.new( java_class, name_index, constant_value_index )
  when "Exceptions"
    exception_index_table = []
    number_of_exceptions = read( 2, io )
    number_of_exceptions.times {
      exception_index_table << read( 2, io )
    }
    attr = ExceptionsAttribute.new( java_class, name_index, exception_index_table )
  when "InnerClasses"
    classes = []
    number_of_classes = read( 2, io )
    number_of_classes.times {
      classes << read_inner_class( io, java_class )
    }
    attr = InnerClassesAttribute.new( java_class, name_index, classes )
  when "EnclosingMethod"
    class_index = read( 2, io )
    method_index = read( 2, io )
    attr = EnclosingMethodAttribute.new( java_class, name_index, class_index, method_index )
  when "SourceFile"
    source_file_index = read( 2, io )
    attr = SourceFileAttribute.new( java_class, name_index, source_file_index )
  when "SourceDebugExtension"
    debug_extension = io.read(length)
    attr = SourceDebugExtensionAttribute.new( java_class, name_index, debug_extension )
  when "AnnotationDefault"
    value = read_annotation_element_value( io, java_class )
    attr = AnnotationDefaultAttribute.new( java_class, name_index, value )
  when "Signature"
    signature_index = read( 2, io )
    attr = SignatureAttribute.new( java_class, name_index, signature_index )
  when "Deprecated"
    attr = DeprecatedAttribute.new( java_class, name_index )
  when "Synthetic"
    attr = SyntheticAttribute.new( java_class, name_index )
  when "RuntimeVisibleAnnotations", "RuntimeInvisibleAnnotations"
    annotations = read_annotations( io, java_class )
    attr = AnnotationsAttribute.new( java_class, name_index, annotations )
  when "RuntimeVisibleParameterAnnotations", "RuntimeInvisibleParameterAnnotations"
    params = []
    num_parameters = read( 1, io )
    num_parameters.times {
      params << read_annotations( io, java_class )
    }
    attr = ParameterAnnotationsAttribute.new( java_class, name_index, params )
  when "AnnotationDefault"
    value = read_annotation_element_value( io, java_class )
    attr = AnnotationDefaultAttribute.new( java_class, name_index, value )
  when "Code"
    max_stack = read( 2, io )
    max_locals = read( 2, io )
    codes = []
    code_length = read( 4, io )
    code_length.times {
      codes << read( 1, io )
    }
    exception_table = []
    exception_table_length = read( 2, io )
    exception_table_length.times {
      exception_table << read_exception( io, java_class )
    }
    attr = CodeAttribute.new( java_class, name_index, max_stack, \
      max_locals, codes, exception_table, {} )
    read_attributes( io, java_class, attr )
  when "LineNumberTable"
    line_number_table = []
    line_number_table_length = read( 2, io )
    line_number_table_length.times {
      line_number_table << read_line_number( io, java_class )
    }
    attr = LineNumberTableAttribute.new( java_class, name_index, line_number_table )
  when "LocalVariableTable"
    local_variable_table = []
    local_variable_table_length = read( 2, io )
    local_variable_table_length.times {
      local_variable_table << read_local_variable( io, java_class )
    }
    attr = LocalVariableTableAttribute.new( java_class, name_index, local_variable_table )
  when "LocalVariableTypeTable"
    local_variable_type_table = []
    local_variable_type_table_length = read( 2, io )
    local_variable_type_table_length.times {
      local_variable_type_table << read_local_variable_type( io, java_class )
    }
    attr = LocalVariableTypeTableAttribute.new( java_class, name_index, local_variable_type_table )
  else
    read( length, io ) # 読み飛ばす。
    attr = Attribute.new( java_class, name_index )
  end
  return attr
end

.read_attributes(io, java_class, owner) ⇒ Object

属性を読み込む

*io::IO *java_class::Javaクラス*owner::属性の所有者



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# File 'lib/javaclass/reader.rb', line 197

def read_attributes( io, java_class, owner )
  count = read( 2, io )
  count.times {|i|
    attr = read_attribute( io, java_class )
    owner.attributes[attr.name] = attr
  }
end

.read_constant(io, java_class) ⇒ Object

IOからconstantを読み込む。

*io::IO。IO.getcが実装されていればOK *java_class::constantの所有者であるJavaクラス戻り値::クラス



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# File 'lib/javaclass/reader.rb', line 140

def read_constant(io, java_class)
  tag = read( 1, io )
  case tag
  when JavaClass::Constant::CONSTANT_Class
    name_index = read( 2, io )
    cp = ClassConstant.new( java_class, tag, name_index )
  when JavaClass::Constant::CONSTANT_Fieldref, \
    JavaClass::Constant::CONSTANT_Methodref, JavaClass::Constant::CONSTANT_InterfaceMethodref
    class_name_index    = read( 2, io )
    name_and_type_index = read( 2, io )
    case tag
    when JavaClass::Constant::CONSTANT_Fieldref
      cp = FieldRefConstant.new( java_class, tag, \
        class_name_index, name_and_type_index )
    when JavaClass::Constant::CONSTANT_Methodref
      cp = MethodRefConstant.new( java_class, tag, \
        class_name_index, name_and_type_index )
    when JavaClass::Constant::CONSTANT_InterfaceMethodref
      cp = InterfaceMethodRefConstant.new( java_class, tag, \
        class_name_index, name_and_type_index )
    end
  when JavaClass::Constant::CONSTANT_NameAndType
    name_index       = read( 2, io )
    descriptor_index = read( 2, io )
    cp = NameAndTypeConstant.new( java_class, tag, name_index, descriptor_index )
  when JavaClass::Constant::CONSTANT_String
    string_index = read( 2, io )
    cp = StringConstant.new( java_class, tag, string_index )
  when JavaClass::Constant::CONSTANT_Integer
    bytes = read( 4, io )
    cp = IntegerConstant.new( java_class, tag, bytes )
  when JavaClass::Constant::CONSTANT_Float
    bytes = read( 4, io )
    cp = FloatConstant.new( java_class, tag, bytes )
  when JavaClass::Constant::CONSTANT_Long
    bytes = read( 8, io )
    cp = LongConstant.new( java_class, tag, bytes )
  when JavaClass::Constant::CONSTANT_Double
    bytes = read( 8, io )
    cp = DoubleConstant.new( java_class, tag, bytes )
  when JavaClass::Constant::CONSTANT_Utf8
    length = read( 2, io )
    bytes = io.read(length)
    cp = UTF8Constant.new( java_class, tag, bytes )
  else
    raise "unknown constant_pool_tag. tag =" << tag.to_s
  end
  return cp
end

.read_exception(io, java_class) ⇒ Object

メソッドの例外を読み込む



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# File 'lib/javaclass/reader.rb', line 408

def read_exception( io, java_class )
  start_pc = read( 2, io )
  end_pc = read( 2, io )
  handler_pc = read( 2, io )
  catch_type = read( 2, io )
  return Excpetion.new( java_class, start_pc, end_pc, handler_pc, catch_type )
end

.read_field(io, java_class) ⇒ Object

フィールドを読み込む

*io::IO *java_class::Javaクラス



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# File 'lib/javaclass/reader.rb', line 111

def read_field( io, java_class )
  f = Field.new( java_class )
  f.access_flag = FieldAccessFlag.new(read( 2, io ))
  f.name_index = read( 2, io )
  f.descriptor_index = read( 2, io )
  read_attributes( io, java_class, f )
  return f
end

.read_inner_class(io, java_class) ⇒ Object

インナークラスを読み込む

*io::IO *java_class::Javaクラス



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# File 'lib/javaclass/reader.rb', line 318

def read_inner_class( io, java_class )
  inner_class_info_index = read( 2, io )
  outer_class_info_index = read( 2, io )
  inner_name_index = read( 2, io )
  inner_class_access_flags = InnerClassAccessFlag.new( read( 2, io ) )
  return InnerClass.new( java_class, inner_class_info_index,
    outer_class_info_index, inner_name_index, inner_class_access_flags )
end

.read_line_number(io, java_class) ⇒ Object

行番号を読み込む



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# File 'lib/javaclass/reader.rb', line 419

def read_line_number( io, java_class )
  start_pc = read( 2, io )
  line_number = read( 2, io )
  return LineNumber.new( java_class, start_pc, line_number )
end

.read_local_variable(io, java_class) ⇒ Object

メソッドのローカル変数を読み込む



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# File 'lib/javaclass/reader.rb', line 428

def read_local_variable( io, java_class )
  start_pc = read( 2, io )
  length = read( 2, io )
  name_index = read( 2, io )
  descriptor_index = read( 2, io )
  index = read( 2, io )
  return LocalVariable.new( java_class, \
    start_pc, length, name_index, descriptor_index, index )
end

.read_local_variable_type(io, java_class) ⇒ Object

メソッドのローカル変数の型を読み込む



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# File 'lib/javaclass/reader.rb', line 440

def read_local_variable_type( io, java_class )
  start_pc = read( 2, io )
  length = read( 2, io )
  name_index = read( 2, io )
  signature_index = read( 2, io )
  index = read( 2, io )
  return LocalVariableType.new( java_class, \
    start_pc, length, name_index, signature_index, index )
end

.read_method(io, java_class) ⇒ Object

メソッドを読み込む

*io::IO *java_class::Javaクラス



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# File 'lib/javaclass/reader.rb', line 96

def read_method( io, java_class )
  m = Method.new( java_class )
  m.access_flag = MethodAccessFlag.new(read( 2, io ))
  m.name_index = read( 2, io )
  m.descriptor_index = read( 2, io )
  read_attributes( io, java_class, m )
  return m
end