Class BytecodeLoader

Method Details

• makeClass

  public static Class<?> makeClass(String name, byte[] data, Class<?>... referents)

  Turn the Java class file data into a Java class.

  Parameters:

  name - fully-qualified binary name of the class

  data - a class file as a byte array

  referents - super-classes and interfaces that the new class will reference.

• makeClass

  public static Class<?> makeClass(String name, List<Class<?>> referents, byte[] data)

  Turn the Java class file data into a Java class.

  Parameters:

  name - the name of the class

  referents - super-classes and interfaces that the new class will reference.

  data - a class file as a byte array

• fixPyBytecode

  public static void fixPyBytecode(Class<? extends ContainsPyBytecode> c) throws IllegalAccessException, NoSuchFieldException, IOException, ClassNotFoundException

  This method looks for Python-Bytecode stored in String literals. While Java supports rather long strings, constrained only by int-addressing of arrays, it supports only up to 65535 characters in literals (not sure how escape-sequences are counted). To circumvent this limitation, the code is automatically splitted into several literals with the following naming-scheme. - The marker-interface 'ContainsPyBytecode' indicates that a class contains (static final) literals of the following scheme: - a prefix of '___' indicates a bytecode-containing string literal - a number indicating the number of parts follows - '0_' indicates that no splitting occurred - otherwise another number follows, naming the index of the literal - indexing starts at 0 Examples: ___0_method1 contains bytecode for method1 ___2_0_method2 contains first part of method2's bytecode ___2_1_method2 contains second part of method2's bytecode Note that this approach is provisional. In future, Jython might contain the bytecode directly as bytecode-objects. The current approach was feasible with much less complicated JVM bytecode-manipulation, but needs special treatment after class-loading.

  Throws:

  IllegalAccessException

  NoSuchFieldException

  IOException

  ClassNotFoundException

• makeCode

  public static PyCode makeCode(String name, byte[] data, String filename)

  Turn the Java class file data for a compiled Python module into a PyCode object, by constructing an instance of the named class and calling the instance's PyRunnable.getMain().

  Parameters:

  name - fully-qualified binary name of the class

  data - a class file as a byte array

  filename - to provide to the constructor of the named class

  Returns:

  the PyCode object produced by the named class' getMain