#!/usr/bin/env python  """ Java bytecode conversion. Specification found at the following URL: http://java.sun.com/docs/books/vmspec/2nd-edition/html/Instructions2.doc.html  NOTE: Synchronized constructs are not actually supported. """  import classfile from dis import cmp_op, opname # for access to Python bytecode values and operators try:     from dis import opmap except ImportError:     opmap = {}     for i in range(0, len(opname)):         opmap[opname[i]] = i from UserDict import UserDict import new  # Bytecode production classes.  class BytecodeWriter:      "A Python bytecode writer."      def __init__(self):          "Initialise the writer."          # A stack of loop start instructions corresponding to loop blocks.         self.loops = []          # A stack of loop block or exception block start positions.         self.blocks = []          # A stack of exception block handler pointers.         self.exception_handlers = []          # A list of exception offset details.         self.exception_offsets = []          # A dictionary mapping labels to jump instructions referencing such labels.         self.jumps = {}          # The output values, including "lazy" subvalues which will need evaluating.         self.output = []          # The current Python bytecode instruction position.         self.position = 0          # Stack depth estimation.         self.stack_depth = 0         self.max_stack_depth = 0          # Local variable estimation.         self.max_locals = 0          # Mapping from values to indexes.         self.constants = {}          # Mapping from names to indexes.         # NOTE: This may be acquired from elsewhere.         #self.globals = {}          # Mapping from names to indexes.         self.names = {}          # A list of constants used as exception handler return addresses.         self.constants_for_exceptions = []          # A list of external names.         self.external_names = []      def get_bytecodes(self):          "Return the list of bytecodes written to the writer."          output = []         for element in self.output:             if isinstance(element, LazySubValue):                 value = element.value             else:                 value = element             output.append(value)         return output      def get_output(self):          "Return the output of the writer as a string."          output = []         for value in self.get_bytecodes():             # NOTE: ValueError gets raised for bad values here.             output.append(chr(value))         return "".join(output)      def get_constants(self):          """         Return a list of constants with ordering significant to the code         employing them.         """          l = self._get_list(self._invert(self.constants))         result = []         for i in l:             if isinstance(i, LazyValue):                 result.append(i.get_value())             else:                 result.append(i)         return result      #def get_globals(self):     #    return self._get_list(self._invert(self.globals))      def get_names(self):          """         Return a list of names with ordering significant to the code employing         them.         """          return self._get_list(self._invert(self.names))      def _invert(self, d):          """         Return a new dictionary whose key-to-value mapping is in the inverse of         that found in 'd'.         """          inverted = {}         for k, v in d.items():             inverted[v] = k         return inverted      def _get_list(self, d):          """         Traverse the dictionary 'd' returning a list whose values appear at the         position denoted by each value's key in 'd'.         """          l = []         for i in range(0, len(d.keys())):             l.append(d[i])         return l      # Administrative methods.      def update_stack_depth(self, change):          """         Given the stated 'change' in stack depth, update the maximum stack depth         where appropriate.         """          self.stack_depth += change         if self.stack_depth > self.max_stack_depth:             self.max_stack_depth = self.stack_depth      def update_locals(self, index):          """         Given the stated 'index' of a local variable, update the maximum local         variable index where appropriate.         """          if index > self.max_locals:             self.max_locals = index      # Special methods.      def _write_value(self, value):          """         Write the given 'value' at the current output position.         """          if isinstance(value, LazyValue):             # NOTE: Assume a 16-bit value.             self.output.append(value.values[0])             self.output.append(value.values[1])             self.position += 2         elif value <= 0xffff:             self.output.append(value & 0xff)             self.output.append((value & 0xff00) >> 8)             self.position += 2         else:             # NOTE: EXTENDED_ARG not yet supported.             raise ValueError, value      def _rewrite_value(self, position, value):          """         At the given output 'position', rewrite the given 'value'.         """          # NOTE: Assume a 16-bit value.         if value <= 0xffff:             self.output[position] = (value & 0xff)             self.output[position + 1] = ((value & 0xff00) >> 8)         else:             # NOTE: EXTENDED_ARG not yet supported.             raise ValueError, value      # Higher level methods.      def use_external_name(self, name):         # NOTE: Remove array and object indicators.         self.external_names.append(name)      def setup_loop(self):         self.loops.append(self.position)         self.output.append(opmap["SETUP_LOOP"])         self.position += 1         self._write_value(0) # To be filled in later      def end_loop(self):         current_loop_start = self.loops.pop()         current_loop_real_start = self.blocks.pop()         #print "<", self.blocks, current_loop_real_start         # Fix the iterator delta.         # NOTE: Using 3 as the assumed length of the FOR_ITER instruction.         self.jump_absolute(current_loop_real_start)         self._rewrite_value(current_loop_real_start + 1, self.position - current_loop_real_start - 3)         self.pop_block()         # Fix the loop delta.         # NOTE: Using 3 as the assumed length of the SETUP_LOOP instruction.         self._rewrite_value(current_loop_start + 1, self.position - current_loop_start - 3)      def jump_to_label(self, status, name):         # Record the instruction using the jump.         jump_instruction = self.position         if status is None:             self.jump_forward()         elif status:             self.jump_if_true()         else:             self.jump_if_false()         # Record the following instruction, too.         if not self.jumps.has_key(name):             self.jumps[name] = []         self.jumps[name].append((jump_instruction, self.position))      def start_label(self, name):         # Fill in all jump instructions.         for jump_instruction, following_instruction in self.jumps[name]:             self._rewrite_value(jump_instruction + 1, self.position - following_instruction)         del self.jumps[name]      def load_const_ret(self, value):         self.constants_for_exceptions.append(value)         self.load_const(value)      def ret(self, index):         self.load_fast(index)          # Previously, the constant stored on the stack by jsr/jsr_w was stored         # in a local variable. In the JVM, extracting the value from the local         # variable and jumping can be done at runtime. In the Python VM, any         # jump target must be known in advance and written into the bytecode.          for constant in self.constants_for_exceptions:             self.dup_top()              # Stack: actual-address, actual-address             self.load_const(constant)   # Stack: actual-address, actual-address, suggested-address             self.compare_op("==")       # Stack: actual-address, result             self.jump_to_label(0, "const")             self.pop_top()              # Stack: actual-address             self.pop_top()              # Stack:             self.jump_absolute(constant)             self.start_label("const")             self.pop_top()              # Stack: actual-address          # NOTE: If we get here, something is really wrong.          self.pop_top()              # Stack:      def setup_except(self, target):         self.blocks.append(self.position)         self.exception_handlers.append(target)         #print "-", self.position, target         self.output.append(opmap["SETUP_EXCEPT"])         self.position += 1         self._write_value(0) # To be filled in later      def setup_finally(self, target):         self.blocks.append(self.position)         self.exception_handlers.append(target)         #print "-", self.position, target         self.output.append(opmap["SETUP_FINALLY"])         self.position += 1         self._write_value(0) # To be filled in later      def end_exception(self):         current_exception_start = self.blocks.pop()         # Convert the "lazy" absolute value.         current_exception_target = self.exception_handlers.pop()         # NOTE: Using 3 as the assumed length of the SETUP_* instruction.         self.exception_offsets.append((current_exception_start + 1, current_exception_target, current_exception_start))      def end_exceptions(self):         for position, exception_target, exception_start in self.exception_offsets:             #print "*", exception_start, exception_target.get_value()             self._rewrite_value(position, exception_target.get_value() - exception_start - 3)      def start_handler(self, exc_name, class_file):          # Where handlers are begun, produce bytecode to test the type of         # the exception.         # NOTE: Since RAISE_VARARGS and END_FINALLY are not really documented,         # NOTE: we store the top of the stack and use it later to trigger the         # NOTE: magic processes when re-raising.         self.use_external_name(str(exc_name))          self.rot_two()                      # Stack: raised-exception, exception         self.dup_top()                      # Stack: raised-exception, exception, exception         # Handled exceptions are wrapped before being thrown.         self.load_global("Exception")       # Stack: raised-exception, exception, exception, Exception         self.compare_op("exception match")  # Stack: raised-exception, exception, result         self.jump_to_label(0, "next")         self.pop_top()                      # Stack: raised-exception, exception         self.dup_top()                      # Stack: raised-exception, exception, exception         self.load_attr("args")              # Stack: raised-exception, exception, args         self.load_const(0)                  # Stack: raised-exception, exception, args, 0         self.binary_subscr()                # Stack: raised-exception, exception, exception-object         load_class_name(class_file, str(exc_name), self)                                             # Stack: raised-exception, exception, exception-object, handled-exception         self.load_global("isinstance")      # Stack: raised-exception, exception, exception-object, handled-exception, isinstance         self.rot_three()                    # Stack: raised-exception, exception, isinstance, exception-object, handled-exception         self.call_function(2)               # Stack: raised-exception, exception, result         self.jump_to_label(1, "handler")         self.start_label("next")         self.pop_top()                      # Stack: raised-exception, exception         self.rot_two()                      # Stack: exception, raised-exception         self.end_finally()         self.start_label("handler")         self.pop_top()                      # Stack: raised-exception, exception      # Complicated methods.      def load_const(self, value):         self.output.append(opmap["LOAD_CONST"])         if not self.constants.has_key(value):             self.constants[value] = len(self.constants.keys())         self.position += 1         self._write_value(self.constants[value])         self.update_stack_depth(1)      def load_global(self, name):         self.output.append(opmap["LOAD_GLOBAL"])         if not self.names.has_key(name):             self.names[name] = len(self.names.keys())         self.position += 1         self._write_value(self.names[name])         self.update_stack_depth(1)      def load_attr(self, name):         self.output.append(opmap["LOAD_ATTR"])         if not self.names.has_key(name):             self.names[name] = len(self.names.keys())         self.position += 1         self._write_value(self.names[name])      def load_name(self, name):         self.output.append(opmap["LOAD_NAME"])         if not self.names.has_key(name):             self.names[name] = len(self.names.keys())         self.position += 1         self._write_value(self.names[name])         self.update_stack_depth(1)      def load_fast(self, index):         self.output.append(opmap["LOAD_FAST"])         self.position += 1         self._write_value(index)         self.update_stack_depth(1)         self.update_locals(index)      def store_attr(self, name):         self.output.append(opmap["STORE_ATTR"])         if not self.names.has_key(name):             self.names[name] = len(self.names.keys())         self.position += 1         self._write_value(self.names[name])         self.update_stack_depth(-1)      def store_fast(self, index):         self.output.append(opmap["STORE_FAST"])         self.position += 1         self._write_value(index)         self.update_stack_depth(-1)         self.update_locals(index)      def for_iter(self):         self.blocks.append(self.position)         #print ">", self.blocks         self.output.append(opmap["FOR_ITER"])         self.position += 1         self._write_value(0) # To be filled in later         self.update_stack_depth(1)      def break_loop(self):         self.output.append(opmap["BREAK_LOOP"])         self.position += 1         self.jump_absolute(self.blocks[-1])      # Normal bytecode generators.      def get_iter(self):         self.output.append(opmap["GET_ITER"])         self.position += 1      def jump_if_false(self, offset=0):         self.output.append(opmap["JUMP_IF_FALSE"])         self.position += 1         self._write_value(offset) # May be filled in later      def jump_if_true(self, offset=0):         self.output.append(opmap["JUMP_IF_TRUE"])         self.position += 1         self._write_value(offset) # May be filled in later      def jump_forward(self, offset=0):         self.output.append(opmap["JUMP_FORWARD"])         self.position += 1         self._write_value(offset) # May be filled in later      def jump_absolute(self, address=0):         self.output.append(opmap["JUMP_ABSOLUTE"])         self.position += 1         self._write_value(address) # May be filled in later      def build_tuple(self, count):         self.output.append(opmap["BUILD_TUPLE"])         self.position += 1         self._write_value(count)         self.update_stack_depth(-(count - 1))      def build_list(self, count):         self.output.append(opmap["BUILD_LIST"])         self.position += 1         self._write_value(count)         self.update_stack_depth(-(count - 1))      def pop_top(self):         self.output.append(opmap["POP_TOP"])         self.position += 1         self.update_stack_depth(-1)      def dup_top(self):         self.output.append(opmap["DUP_TOP"])         self.position += 1         self.update_stack_depth(1)      def dup_topx(self, count):         self.output.append(opmap["DUP_TOPX"])         self.position += 1         self._write_value(count)         self.update_stack_depth(count)      def rot_two(self):         self.output.append(opmap["ROT_TWO"])         self.position += 1      def rot_three(self):         self.output.append(opmap["ROT_THREE"])         self.position += 1      def rot_four(self):         self.output.append(opmap["ROT_FOUR"])         self.position += 1      def call_function(self, count):         self.output.append(opmap["CALL_FUNCTION"])         self.position += 1         self._write_value(count)         self.update_stack_depth(-count)      def call_function_var(self, count):         self.output.append(opmap["CALL_FUNCTION_VAR"])         self.position += 1         self._write_value(count)         self.update_stack_depth(-count-1)      def binary_subscr(self):         self.output.append(opmap["BINARY_SUBSCR"])         self.position += 1         self.update_stack_depth(-1)      def binary_add(self):         self.output.append(opmap["BINARY_ADD"])         self.position += 1         self.update_stack_depth(-1)      def binary_divide(self):         self.output.append(opmap["BINARY_DIVIDE"])         self.position += 1         self.update_stack_depth(-1)      def binary_multiply(self):         self.output.append(opmap["BINARY_MULTIPLY"])         self.position += 1         self.update_stack_depth(-1)      def binary_modulo(self):         self.output.append(opmap["BINARY_MODULO"])         self.position += 1         self.update_stack_depth(-1)      def binary_subtract(self):         self.output.append(opmap["BINARY_SUBTRACT"])         self.position += 1         self.update_stack_depth(-1)      def binary_and(self):         self.output.append(opmap["BINARY_AND"])         self.position += 1         self.update_stack_depth(-1)      def binary_or(self):         self.output.append(opmap["BINARY_XOR"])         self.position += 1         self.update_stack_depth(-1)      def binary_lshift(self):         self.output.append(opmap["BINARY_LSHIFT"])         self.position += 1         self.update_stack_depth(-1)      def binary_rshift(self):         self.output.append(opmap["BINARY_RSHIFT"])         self.position += 1         self.update_stack_depth(-1)      def binary_xor(self):         self.output.append(opmap["BINARY_XOR"])         self.position += 1         self.update_stack_depth(-1)      def store_subscr(self):         self.output.append(opmap["STORE_SUBSCR"])         self.position += 1         self.update_stack_depth(-3)      def unary_negative(self):         self.output.append(opmap["UNARY_NEGATIVE"])         self.position += 1      def slice_0(self):         self.output.append(opmap["SLICE+0"])         self.position += 1      def slice_1(self):         self.output.append(opmap["SLICE+1"])         self.position += 1      def compare_op(self, op):         self.output.append(opmap["COMPARE_OP"])         self.position += 1         self._write_value(list(cmp_op).index(op))         self.update_stack_depth(-1)      def return_value(self):         self.output.append(opmap["RETURN_VALUE"])         self.position += 1         self.update_stack_depth(-1)      def raise_varargs(self, count):         self.output.append(opmap["RAISE_VARARGS"])         self.position += 1         self._write_value(count)      def pop_block(self):         self.output.append(opmap["POP_BLOCK"])         self.position += 1      def end_finally(self):         self.output.append(opmap["END_FINALLY"])         self.position += 1      def unpack_sequence(self, count):         self.output.append(opmap["UNPACK_SEQUENCE"])         self.position += 1         self._write_value(count)      # Debugging.      def print_item(self):         self.output.append(opmap["PRINT_ITEM"])         self.position += 1  # Utility classes and functions.  class LazyDict(UserDict):     def __getitem__(self, key):         if not self.data.has_key(key):             # NOTE: Assume 16-bit value.             self.data[key] = LazyValue(2)         return self.data[key]     def __setitem__(self, key, value):         if self.data.has_key(key):             existing_value = self.data[key]             if isinstance(existing_value, LazyValue):                 existing_value.set_value(value)                 return         self.data[key] = value  class LazyValue:     def __init__(self, nvalues):         self.values = []         for i in range(0, nvalues):             self.values.append(LazySubValue())     def set_value(self, value):         # NOTE: Assume at least 16-bit value. No "filling" performed.         if value <= 0xffff:             self.values[0].set_value(value & 0xff)             self.values[1].set_value((value & 0xff00) >> 8)         else:             # NOTE: EXTENDED_ARG not yet supported.             raise ValueError, value     def get_value(self):         value = 0         values = self.values[:]         for i in range(0, len(values)):             value = (value << 8) + values.pop().value         return value  class LazySubValue:     def __init__(self):         self.value = 0     def set_value(self, value):         self.value = value  def signed(value, limit):      """     Return the signed integer from the unsigned 'value', where 'limit' (a value     one greater than the highest possible positive integer) is used to determine     whether a negative or positive result is produced.     """      d, r = divmod(value, limit)     if d == 1:         mask = limit * 2 - 1         return -1 - (value ^ mask)     else:         return value  def signed1(value):     return signed(value, 0x80)  def signed2(value):     return signed(value, 0x8000)  def signed4(value):     return signed(value, 0x80000000)  def load_class_name(class_file, full_class_name, program):     this_class_name = str(class_file.this_class.get_python_name())     this_class_parts = this_class_name.split(".")     class_parts = full_class_name.split(".")      # Only use the full path if different from this class's path.      if class_parts[:-1] != this_class_parts[:-1]:         program.use_external_name(full_class_name)         program.load_global(class_parts[0])         for class_part in class_parts[1:]:             program.load_attr(class_part)   # Stack: classref     else:         program.load_global(class_parts[-1])  atypes_to_default_values = {     4 : 0,      # bool (NOTE: Should be False.)     5 : u"",    # char     6 : 0.0,    # float     7 : 0.0,    # double     8 : 0,      # byte     9 : 0,      # short     10: 0,      # int     11: 0       # long }  def get_default_for_atype(atype):     global atypes_to_default_values     return atypes_to_default_values.get(atype)  # Bytecode conversion.  class BytecodeReader:      "A generic Java bytecode reader."      def __init__(self, class_file):          """         Initialise the reader with a 'class_file' containing essential         information for any bytecode inspection activity.         """          self.class_file = class_file         self.position_mapping = LazyDict()      def process(self, method, program):          """         Process the given 'method' (obtained from the class file), using the         given 'program' to write translated Python bytecode instructions.         """          self.java_position = 0         self.in_finally = 0         self.method = method          # NOTE: Potentially unreliable way of getting necessary information.          code, exception_table = None, None         for attribute in method.attributes:             if isinstance(attribute, classfile.CodeAttributeInfo):                 code, exception_table = attribute.code, attribute.exception_table                 break          # Where no code was found, write a very simple placeholder routine.         # This is useful for interfaces and abstract classes.         # NOTE: Assess the correctness of doing this. An exception should really         # NOTE: be raised instead.          if code is None:             program.load_const(None)             program.return_value()             return          # Produce a structure which permits fast access to exception details.          exception_block_start = {}         exception_block_end = {}         exception_block_handler = {}         reversed_exception_table = exception_table[:]         reversed_exception_table.reverse()          # Later entries have wider coverage than earlier entries.          for exception in reversed_exception_table:              # NOTE: Strange case with javac from JDK 1.4 but not JDK 1.3:             # NOTE: start_pc == handler_pc             # Merge all finally handlers with the same handler location.              if exception.catch_type == 0 and exception_block_handler.get(exception.handler_pc, []) != []:                  # Make a new definition.                  new_exception = classfile.ExceptionInfo()                 new_exception.catch_type = exception.catch_type                 new_exception.handler_pc = exception.handler_pc                 new_exception.end_pc = exception.end_pc                 new_exception.start_pc = exception.start_pc                  # Find the previous exception handler definition.                   for previous_exception in exception_block_handler[exception.handler_pc][:]:                     if previous_exception.catch_type == 0:                         new_exception.end_pc = max(new_exception.end_pc, previous_exception.end_pc)                         new_exception.start_pc = min(new_exception.start_pc, previous_exception.start_pc)                          # Remove this exception from the lists.                          exception_block_handler[previous_exception.handler_pc].remove(previous_exception)                         exception_block_start[previous_exception.start_pc].remove(previous_exception)                         exception_block_end[previous_exception.end_pc].remove(previous_exception)                         break                  # Use the new definition instead.                  exception = new_exception              # Index start positions.              if not exception_block_start.has_key(exception.start_pc):                 exception_block_start[exception.start_pc] = []             exception_block_start[exception.start_pc].append(exception)              # Index end positions.              if not exception_block_end.has_key(exception.end_pc):                 exception_block_end[exception.end_pc] = []             exception_block_end[exception.end_pc].append(exception)              # Index handler positions.              if not exception_block_handler.has_key(exception.handler_pc):                 exception_block_handler[exception.handler_pc] = []             exception_block_handler[exception.handler_pc].append(exception)          # Process each instruction in the code.          while self.java_position < len(code):             self.position_mapping[self.java_position] = program.position              # Insert exception handling constructs.              block_starts = exception_block_start.get(self.java_position, [])             for exception in block_starts:                  # Note that the absolute position is used.                  if exception.catch_type == 0:                     program.setup_finally(self.position_mapping[exception.handler_pc])                 else:                     program.setup_except(self.position_mapping[exception.handler_pc])              if block_starts:                 self.in_finally = 0              # Insert exception handler details.             # NOTE: Ensure that pop_block is reachable by possibly inserting it at the start of finally handlers.             # NOTE: Insert a check for the correct exception at the start of each handler.              for exception in exception_block_handler.get(self.java_position, []):                 program.end_exception()                 if exception.catch_type == 0:                     self.in_finally = 1                 else:                     program.start_handler(self.class_file.constants[exception.catch_type - 1].get_python_name(), self.class_file)              # Process the bytecode at the current position.              bytecode = ord(code[self.java_position])             mnemonic, number_of_arguments = self.java_bytecodes[bytecode]             number_of_arguments = self.process_bytecode(mnemonic, number_of_arguments, code, program)             next_java_position = self.java_position + 1 + number_of_arguments              # Insert exception block end details.              for exception in exception_block_end.get(next_java_position, []):                  # NOTE: Insert jump beyond handlers.                 # NOTE: program.jump_forward/absolute(...)                 # NOTE: Insert end finally at end of handlers as well as where "ret" occurs.                  if exception.catch_type != 0:                     program.pop_block()              # Only advance the JVM position after sneaking in extra Python             # instructions.              self.java_position = next_java_position          # Tidy up exceptions.          program.end_exceptions()      def process_bytecode(self, mnemonic, number_of_arguments, code, program):          """         Process a bytecode instruction with the given 'mnemonic' and         'number_of_arguments'. The 'code' parameter contains the full method         code so that argument data can be inspected. The 'program' parameter is         used to produce a Python translation of the instruction.         """          if number_of_arguments is not None:             arguments = []             for j in range(0, number_of_arguments):                 arguments.append(ord(code[self.java_position + 1 + j]))              # Call the handler.              getattr(self, mnemonic)(arguments, program)             return number_of_arguments         else:             # Call the handler.              return getattr(self, mnemonic)(code[self.java_position+1:], program)      java_bytecodes = {         # code : (mnemonic, number of following bytes, change in stack)         0 : ("nop", 0),         1 : ("aconst_null", 0),         2 : ("iconst_m1", 0),         3 : ("iconst_0", 0),         4 : ("iconst_1", 0),         5 : ("iconst_2", 0),         6 : ("iconst_3", 0),         7 : ("iconst_4", 0),         8 : ("iconst_5", 0),         9 : ("lconst_0", 0),         10 : ("lconst_1", 0),         11 : ("fconst_0", 0),         12 : ("fconst_1", 0),         13 : ("fconst_2", 0),         14 : ("dconst_0", 0),         15 : ("dconst_1", 0),         16 : ("bipush", 1),         17 : ("sipush", 2),         18 : ("ldc", 1),         19 : ("ldc_w", 2),         20 : ("ldc2_w", 2),         21 : ("iload", 1),         22 : ("lload", 1),         23 : ("fload", 1),         24 : ("dload", 1),         25 : ("aload", 1),         26 : ("iload_0", 0),         27 : ("iload_1", 0),         28 : ("iload_2", 0),         29 : ("iload_3", 0),         30 : ("lload_0", 0),         31 : ("lload_1", 0),         32 : ("lload_2", 0),         33 : ("lload_3", 0),         34 : ("fload_0", 0),         35 : ("fload_1", 0),         36 : ("fload_2", 0),         37 : ("fload_3", 0),         38 : ("dload_0", 0),         39 : ("dload_1", 0),         40 : ("dload_2", 0),         41 : ("dload_3", 0),         42 : ("aload_0", 0),         43 : ("aload_1", 0),         44 : ("aload_2", 0),         45 : ("aload_3", 0),         46 : ("iaload", 0),         47 : ("laload", 0),         48 : ("faload", 0),         49 : ("daload", 0),         50 : ("aaload", 0),         51 : ("baload", 0),         52 : ("caload", 0),         53 : ("saload", 0),         54 : ("istore", 1),         55 : ("lstore", 1),         56 : ("fstore", 1),         57 : ("dstore", 1),         58 : ("astore", 1),         59 : ("istore_0", 0),         60 : ("istore_1", 0),         61 : ("istore_2", 0),         62 : ("istore_3", 0),         63 : ("lstore_0", 0),         64 : ("lstore_1", 0),         65 : ("lstore_2", 0),         66 : ("lstore_3", 0),         67 : ("fstore_0", 0),         68 : ("fstore_1", 0),         69 : ("fstore_2", 0),         70 : ("fstore_3", 0),         71 : ("dstore_0", 0),         72 : ("dstore_1", 0),         73 : ("dstore_2", 0),         74 : ("dstore_3", 0),         75 : ("astore_0", 0),         76 : ("astore_1", 0),         77 : ("astore_2", 0),         78 : ("astore_3", 0),         79 : ("iastore", 0),         80 : ("lastore", 0),         81 : ("fastore", 0),         82 : ("dastore", 0),         83 : ("aastore", 0),         84 : ("bastore", 0),         85 : ("castore", 0),         86 : ("sastore", 0),         87 : ("pop", 0),         88 : ("pop2", 0),         89 : ("dup", 0),         90 : ("dup_x1", 0),         91 : ("dup_x2", 0),         92 : ("dup2", 0),         93 : ("dup2_x1", 0),         94 : ("dup2_x2", 0),         95 : ("swap", 0),         96 : ("iadd", 0),         97 : ("ladd", 0),         98 : ("fadd", 0),         99 : ("dadd", 0),         100 : ("isub", 0),         101 : ("lsub", 0),         102 : ("fsub", 0),         103 : ("dsub", 0),         104 : ("imul", 0),         105 : ("lmul", 0),         106 : ("fmul", 0),         107 : ("dmul", 0),         108 : ("idiv", 0),         109 : ("ldiv", 0),         110 : ("fdiv", 0),         111 : ("ddiv", 0),         112 : ("irem", 0),         113 : ("lrem", 0),         114 : ("frem", 0),         115 : ("drem", 0),         116 : ("ineg", 0),         117 : ("lneg", 0),         118 : ("fneg", 0),         119 : ("dneg", 0),         120 : ("ishl", 0),         121 : ("lshl", 0),         122 : ("ishr", 0),         123 : ("lshr", 0),         124 : ("iushr", 0),         125 : ("lushr", 0),         126 : ("iand", 0),         127 : ("land", 0),         128 : ("ior", 0),         129 : ("lor", 0),         130 : ("ixor", 0),         131 : ("lxor", 0),         132 : ("iinc", 2),         133 : ("i2l", 0),         134 : ("i2f", 0),         135 : ("i2d", 0),         136 : ("l2i", 0),         137 : ("l2f", 0),         138 : ("l2d", 0),         139 : ("f2i", 0),         140 : ("f2l", 0),         141 : ("f2d", 0),         142 : ("d2i", 0),         143 : ("d2l", 0),         144 : ("d2f", 0),         145 : ("i2b", 0),         146 : ("i2c", 0),         147 : ("i2s", 0),         148 : ("lcmp", 0),         149 : ("fcmpl", 0),         150 : ("fcmpg", 0),         151 : ("dcmpl", 0),         152 : ("dcmpg", 0),         153 : ("ifeq", 2),         154 : ("ifne", 2),         155 : ("iflt", 2),         156 : ("ifge", 2),         157 : ("ifgt", 2),         158 : ("ifle", 2),         159 : ("if_icmpeq", 2),         160 : ("if_icmpne", 2),         161 : ("if_icmplt", 2),         162 : ("if_icmpge", 2),         163 : ("if_icmpgt", 2),         164 : ("if_icmple", 2),         165 : ("if_acmpeq", 2),         166 : ("if_acmpne", 2),         167 : ("goto", 2),         168 : ("jsr", 2),         169 : ("ret", 1),         170 : ("tableswitch", None), # variable number of arguments         171 : ("lookupswitch", None), # variable number of arguments         172 : ("ireturn", 0),         173 : ("lreturn", 0),         174 : ("freturn", 0),         175 : ("dreturn", 0),         176 : ("areturn", 0),         177 : ("return_", 0),         178 : ("getstatic", 2),         179 : ("putstatic", 2),         180 : ("getfield", 2),         181 : ("putfield", 2),         182 : ("invokevirtual", 2),         183 : ("invokespecial", 2),         184 : ("invokestatic", 2),         185 : ("invokeinterface", 4),         187 : ("new", 2),         188 : ("newarray", 1),         189 : ("anewarray", 2),         190 : ("arraylength", 0),         191 : ("athrow", 0),         192 : ("checkcast", 2),         193 : ("instanceof", 2),         194 : ("monitorenter", 0),         195 : ("monitorexit", 0),         196 : ("wide", None), # 3 or 5 arguments, stack changes according to modified element         197 : ("multianewarray", 3),         198 : ("ifnull", 2),         199 : ("ifnonnull", 2),         200 : ("goto_w", 4),         201 : ("jsr_w", 4),         }  class BytecodeDisassembler(BytecodeReader):      "A Java bytecode disassembler."      bytecode_methods = [spec[0] for spec in BytecodeReader.java_bytecodes.values()]      def __getattr__(self, name):         if name in self.bytecode_methods:             print "%5s %s" % (self.java_position, name),             return self.generic         else:             raise AttributeError, name      def generic(self, arguments, program):         print arguments      def lookupswitch(self, code, program):         print "%5s lookupswitch" % (self.java_position,),         d, r = divmod(self.java_position + 1, 4)         to_boundary = (4 - r) % 4         code = code[to_boundary:]         default = classfile.u4(code[0:4])         npairs = classfile.u4(code[4:8])         print default, npairs         return to_boundary + 8 + npairs * 8      def tableswitch(self, code, program):         print "%5s tableswitch" % (self.java_position,),         d, r = divmod(self.java_position + 1, 4)         to_boundary = (4 - r) % 4         code = code[to_boundary:]         default = classfile.u4(code[0:4])         low = classfile.u4(code[4:8])         high = classfile.u4(code[8:12])         print default, low, high         return to_boundary + 12 + (high - low + 1) * 4  class BytecodeDisassemblerProgram:     position = 0     def setup_except(self, target):         print "(setup_except %s)" % target     def setup_finally(self, target):         print "(setup_finally %s)" % target     def end_exception(self):         print "(end_exception)"     def start_handler(self, exc_name, class_file):         print "(start_handler %s)" % exc_name     def pop_block(self):         print "(pop_block)"     def load_const(self, const):         print "(load_const %s)" % const     def return_value(self):         print "(return_value)"  class BytecodeTranslator(BytecodeReader):      "A Java bytecode translator which uses a Python bytecode writer."      def aaload(self, arguments, program):         # NOTE: No type checking performed.         program.binary_subscr()      def aastore(self, arguments, program):         # NOTE: No type checking performed.         # Stack: arrayref, index, value         program.rot_three() # Stack: value, arrayref, index         program.store_subscr()      def aconst_null(self, arguments, program):         program.load_const(None)      def aload(self, arguments, program):         program.load_fast(arguments[0])      def aload_0(self, arguments, program):         program.load_fast(0)      def aload_1(self, arguments, program):         program.load_fast(1)      def aload_2(self, arguments, program):         program.load_fast(2)      def aload_3(self, arguments, program):         program.load_fast(3)      def anewarray(self, arguments, program):         # NOTE: Does not raise NegativeArraySizeException.         # NOTE: Not using the index to type the list/array.         index = (arguments[0] << 8) + arguments[1]         type_name = self.class_file.constants[index - 1].get_python_name()         default_value = classfile.get_default_for_type(type_name)         self._newarray(program, type_name)      def _newarray(self, program, default_value):         program.build_list(0)               # Stack: count, list         program.rot_two()                   # Stack: list, count         program.setup_loop()         program.load_global("range")         program.load_const(0)               # Stack: list, count, range, 0         program.rot_three()                 # Stack: list, 0, count, range         program.rot_three()                 # Stack: list, range, 0, count         program.call_function(2)            # Stack: list, range_list         program.get_iter()                  # Stack: list, iter         program.for_iter()                  # Stack: list, iter, value         program.pop_top()                   # Stack: list, iter         program.rot_two()                   # Stack: iter, list         program.dup_top()                   # Stack: iter, list, list         program.load_attr("append")         # Stack: iter, list, append         program.load_const(default_value)   # Stack: iter, list, append, default         program.call_function(1)            # Stack: iter, list, default         program.pop_top()                   # Stack: iter, list         program.rot_two()                   # Stack: list, iter         program.end_loop()                  # Back to for_iter above      def areturn(self, arguments, program):         program.return_value()      def arraylength(self, arguments, program):         program.load_global("len")  # Stack: arrayref, len         program.rot_two()           # Stack: len, arrayref         program.call_function(1)      def astore(self, arguments, program):         program.store_fast(arguments[0])      def astore_0(self, arguments, program):         program.store_fast(0)      def astore_1(self, arguments, program):         program.store_fast(1)      def astore_2(self, arguments, program):         program.store_fast(2)      def astore_3(self, arguments, program):         program.store_fast(3)      def athrow(self, arguments, program):         # NOTE: NullPointerException not raised where null/None is found on the stack.         # If this instruction appears in a finally handler, use end_finally instead.         if self.in_finally:             program.end_finally()         else:             # Wrap the exception in a Python exception.             program.load_global("Exception")    # Stack: objectref, Exception             program.rot_two()                   # Stack: Exception, objectref             program.call_function(1)            # Stack: exception             program.raise_varargs(1)             # NOTE: This seems to put another object on the stack.      baload = aaload     bastore = aastore      def bipush(self, arguments, program):         program.load_const(signed1(arguments[0]))      caload = aaload     castore = aastore      def checkcast(self, arguments, program):         index = (arguments[0] << 8) + arguments[1]         target_name = self.class_file.constants[index - 1].get_python_name()         program.use_external_name(target_name)         program.dup_top()                   # Stack: objectref, objectref         program.load_const(None)            # Stack: objectref, objectref, None         program.compare_op("is")            # Stack: objectref, result         program.jump_to_label(1, "next")         program.pop_top()                   # Stack: objectref         program.dup_top()                   # Stack: objectref, objectref         program.load_global("isinstance")   # Stack: objectref, objectref, isinstance         program.rot_two()                   # Stack: objectref, isinstance, objectref         load_class_name(self.class_file, target_name, program)         program.call_function(2)            # Stack: objectref, result         program.jump_to_label(1, "next")         program.pop_top()                   # Stack: objectref         program.pop_top()                   # Stack:         program.use_external_name("java.lang.ClassCastException")         load_class_name(self.class_file, "java.lang.ClassCastException", program)         program.call_function(0)            # Stack: exception         # Wrap the exception in a Python exception.         program.load_global("Exception")    # Stack: exception, Exception         program.rot_two()                   # Stack: Exception, exception         program.call_function(1)            # Stack: exception         program.raise_varargs(1)         # NOTE: This seems to put another object on the stack.         program.start_label("next")         program.pop_top()                   # Stack: objectref      def d2f(self, arguments, program):         pass      def d2i(self, arguments, program):         program.load_global("int")  # Stack: value, int         program.rot_two()           # Stack: int, value         program.call_function(1)    # Stack: result      d2l = d2i # Preserving Java semantics      def dadd(self, arguments, program):         # NOTE: No type checking performed.         program.binary_add()      daload = aaload     dastore = aastore      def dcmpg(self, arguments, program):         # NOTE: No type checking performed.         program.compare_op(">")      def dcmpl(self, arguments, program):         # NOTE: No type checking performed.         program.compare_op("<")      def dconst_0(self, arguments, program):         program.load_const(0.0)      def dconst_1(self, arguments, program):         program.load_const(1.0)      def ddiv(self, arguments, program):         # NOTE: No type checking performed.         program.binary_divide()      dload = aload     dload_0 = aload_0     dload_1 = aload_1     dload_2 = aload_2     dload_3 = aload_3      def dmul(self, arguments, program):         # NOTE: No type checking performed.         program.binary_multiply()      def dneg(self, arguments, program):         # NOTE: No type checking performed.         program.unary_negative()      def drem(self, arguments, program):         # NOTE: No type checking performed.         program.binary_modulo()      dreturn = areturn     dstore = astore     dstore_0 = astore_0     dstore_1 = astore_1     dstore_2 = astore_2     dstore_3 = astore_3      def dsub(self, arguments, program):         # NOTE: No type checking performed.         program.binary_subtract()      def dup(self, arguments, program):         program.dup_top()      def dup_x1(self, arguments, program):         # Ignoring computational type categories.         program.dup_top()         program.rot_three()      def dup_x2(self, arguments, program):         # Ignoring computational type categories.         program.dup_top()         program.rot_four()      dup2 = dup # Ignoring computational type categories     dup2_x1 = dup_x1 # Ignoring computational type categories     dup2_x2 = dup_x2 # Ignoring computational type categories      def f2d(self, arguments, program):         pass # Preserving Java semantics      def f2i(self, arguments, program):         program.load_global("int")  # Stack: value, int         program.rot_two()           # Stack: int, value         program.call_function(1)    # Stack: result      f2l = f2i # Preserving Java semantics     fadd = dadd     faload = daload     fastore = dastore     fcmpg = dcmpg     fcmpl = dcmpl     fconst_0 = dconst_0     fconst_1 = dconst_1      def fconst_2(self, arguments, program):         program.load_const(2.0)      fdiv = ddiv     fload = dload     fload_0 = dload_0     fload_1 = dload_1     fload_2 = dload_2     fload_3 = dload_3     fmul = dmul     fneg = dneg     frem = drem     freturn = dreturn     fstore = dstore     fstore_0 = dstore_0     fstore_1 = dstore_1     fstore_2 = dstore_2     fstore_3 = dstore_3     fsub = dsub      def getfield(self, arguments, program):         index = (arguments[0] << 8) + arguments[1]         target_name = self.class_file.constants[index - 1].get_python_name()         # NOTE: Using the string version of the name which may contain incompatible characters.         program.load_attr(str(target_name))      def getstatic(self, arguments, program):         index = (arguments[0] << 8) + arguments[1]         target = self.class_file.constants[index - 1]         target_name = target.get_python_name()          # Get the class name instead of the fully qualified name.          full_class_name = target.get_class().get_python_name()         program.use_external_name(full_class_name)         load_class_name(self.class_file, full_class_name, program)         # NOTE: Using the string version of the name which may contain incompatible characters.         program.load_attr(str(target_name))      def goto(self, arguments, program):         offset = signed2((arguments[0] << 8) + arguments[1])         java_absolute = self.java_position + offset         program.jump_absolute(self.position_mapping[java_absolute])      def goto_w(self, arguments, program):         offset = signed4((arguments[0] << 24) + (arguments[1] << 16) + (arguments[2] << 8) + arguments[3])         java_absolute = self.java_position + offset         program.jump_absolute(self.position_mapping[java_absolute])      def i2b(self, arguments, program):         pass      def i2c(self, arguments, program):         pass      def i2d(self, arguments, program):         program.load_global("float")    # Stack: value, float         program.rot_two()               # Stack: float, value         program.call_function(1)        # Stack: result      i2f = i2d # Not distinguishing between float and double      def i2l(self, arguments, program):         pass # Preserving Java semantics      def i2s(self, arguments, program):         pass # Not distinguishing between int and short      iadd = fadd     iaload = faload      def iand(self, arguments, program):         # NOTE: No type checking performed.         program.binary_and()      iastore = fastore      def iconst_m1(self, arguments, program):         program.load_const(-1)      def iconst_0(self, arguments, program):         program.load_const(0)      def iconst_1(self, arguments, program):         program.load_const(1)      def iconst_2(self, arguments, program):         program.load_const(2)      def iconst_3(self, arguments, program):         program.load_const(3)      def iconst_4(self, arguments, program):         program.load_const(4)      def iconst_5(self, arguments, program):         program.load_const(5)      idiv = fdiv      def _if_xcmpx(self, arguments, program, op):         offset = signed2((arguments[0] << 8) + arguments[1])         java_absolute = self.java_position + offset         program.compare_op(op)         program.jump_to_label(0, "next") # skip if false         program.pop_top()         program.jump_absolute(self.position_mapping[java_absolute])         program.start_label("next")         program.pop_top()      def if_acmpeq(self, arguments, program):         # NOTE: No type checking performed.         self._if_xcmpx(arguments, program, "is")      def if_acmpne(self, arguments, program):         # NOTE: No type checking performed.         self._if_xcmpx(arguments, program, "is not")      def if_icmpeq(self, arguments, program):         # NOTE: No type checking performed.         self._if_xcmpx(arguments, program, "==")      def if_icmpne(self, arguments, program):         # NOTE: No type checking performed.         self._if_xcmpx(arguments, program, "!=")      def if_icmplt(self, arguments, program):         # NOTE: No type checking performed.         self._if_xcmpx(arguments, program, "<")      def if_icmpge(self, arguments, program):         # NOTE: No type checking performed.         self._if_xcmpx(arguments, program, ">=")      def if_icmpgt(self, arguments, program):         # NOTE: No type checking performed.         self._if_xcmpx(arguments, program, ">")      def if_icmple(self, arguments, program):         # NOTE: No type checking performed.         self._if_xcmpx(arguments, program, "<=")      def ifeq(self, arguments, program):         # NOTE: No type checking performed.         program.load_const(0)         self._if_xcmpx(arguments, program, "==")      def ifne(self, arguments, program):         # NOTE: No type checking performed.         program.load_const(0)         self._if_xcmpx(arguments, program, "!=")      def iflt(self, arguments, program):         # NOTE: No type checking performed.         program.load_const(0)         self._if_xcmpx(arguments, program, "<")      def ifge(self, arguments, program):         # NOTE: No type checking performed.         program.load_const(0)         self._if_xcmpx(arguments, program, ">=")      def ifgt(self, arguments, program):         # NOTE: No type checking performed.         program.load_const(0)         self._if_xcmpx(arguments, program, ">")      def ifle(self, arguments, program):         # NOTE: No type checking performed.         program.load_const(0)         self._if_xcmpx(arguments, program, "<=")      def ifnonnull(self, arguments, program):         # NOTE: No type checking performed.         program.load_const(None)         self._if_xcmpx(arguments, program, "is not")      def ifnull(self, arguments, program):         # NOTE: No type checking performed.         program.load_const(None)         self._if_xcmpx(arguments, program, "is")      def iinc(self, arguments, program):         # NOTE: No type checking performed.         program.load_fast(arguments[0])         program.load_const(arguments[1])         program.binary_add()         program.store_fast(arguments[0])      iload = fload     iload_0 = fload_0     iload_1 = fload_1     iload_2 = fload_2     iload_3 = fload_3     imul = fmul     ineg = fneg      def instanceof(self, arguments, program):         index = (arguments[0] << 8) + arguments[1]         target_name = self.class_file.constants[index - 1].get_python_name()         program.use_external_name(target_name)         program.load_global("isinstance")   # Stack: objectref, isinstance         program.rot_two()                   # Stack: isinstance, objectref         load_class_name(self.class_file, target_name, program)         program.call_function(2)            # Stack: result      def _invoke(self, target_name, program):         # NOTE: Using the string version of the name which may contain incompatible characters.         program.load_attr(str(target_name)) # Stack: tuple, method         program.rot_two()                   # Stack: method, tuple         program.call_function_var(0)        # Stack: result      def invokeinterface(self, arguments, program):         # NOTE: This implementation does not perform the necessary checks for         # NOTE: signature-based polymorphism.         # NOTE: Java rules not specifically obeyed.         index = (arguments[0] << 8) + arguments[1]         # NOTE: "count" == nargs + 1, apparently.         count = arguments[2] - 1         target_name = self.class_file.constants[index - 1].get_python_name()         # Stack: objectref, arg1, arg2, ...         program.build_tuple(count)          # Stack: objectref, tuple         program.rot_two()                   # Stack: tuple, objectref         # NOTE: The interface information is not used to discover the correct         # NOTE: method.         self._invoke(target_name, program)      def invokespecial(self, arguments, program):         # NOTE: This implementation does not perform the necessary checks for         # NOTE: signature-based polymorphism.         # NOTE: Java rules not specifically obeyed.         index = (arguments[0] << 8) + arguments[1]         target = self.class_file.constants[index - 1]         original_name = target.get_name()         target_name = target.get_python_name()          # Get the number of parameters from the descriptor.          count = len(target.get_descriptor()[0])          # First, we build a tuple of the reference and arguments.          program.build_tuple(count + 1)          # Stack: tuple          # Get the class name instead of the fully qualified name.         # NOTE: Not bothering with Object initialisation.          full_class_name = target.get_class().get_python_name()         if full_class_name not in ("java.lang.Object", "java.lang.Exception"):             program.use_external_name(full_class_name)             load_class_name(self.class_file, full_class_name, program)             self._invoke(target_name, program)          # Remove Python None return value.          if str(original_name) == "<init>":             program.pop_top()      def invokestatic(self, arguments, program):         # NOTE: This implementation does not perform the necessary checks for         # NOTE: signature-based polymorphism.         # NOTE: Java rules not specifically obeyed.         index = (arguments[0] << 8) + arguments[1]         target = self.class_file.constants[index - 1]         target_name = target.get_python_name()          # Get the number of parameters from the descriptor.          count = len(target.get_descriptor()[0])          # Stack: arg1, arg2, ...          program.build_tuple(count)              # Stack: tuple          # Use the class to provide access to static methods.         # Get the class name instead of the fully qualified name.          full_class_name = target.get_class().get_python_name()         if full_class_name not in ("java.lang.Object", "java.lang.Exception"):             program.use_external_name(full_class_name)             load_class_name(self.class_file, full_class_name, program)             self._invoke(target_name, program)      def invokevirtual (self, arguments, program):         # NOTE: This implementation does not perform the necessary checks for         # NOTE: signature-based polymorphism.         # NOTE: Java rules not specifically obeyed.         index = (arguments[0] << 8) + arguments[1]         target = self.class_file.constants[index - 1]         target_name = target.get_python_name()         # Get the number of parameters from the descriptor.         count = len(target.get_descriptor()[0])         # Stack: objectref, arg1, arg2, ...         program.build_tuple(count)          # Stack: objectref, tuple         program.rot_two()                   # Stack: tuple, objectref         self._invoke(target_name, program)      def ior(self, arguments, program):         # NOTE: No type checking performed.         program.binary_or()      irem = frem     ireturn = freturn      def ishl(self, arguments, program):         # NOTE: No type checking performed.         # NOTE: Not verified.         program.binary_lshift()      def ishr(self, arguments, program):         # NOTE: No type checking performed.         # NOTE: Not verified.         program.binary_rshift()      istore = fstore     istore_0 = fstore_0     istore_1 = fstore_1     istore_2 = fstore_2     istore_3 = fstore_3     isub = fsub     iushr = ishr # Ignoring distinctions between arithmetic and logical shifts      def ixor(self, arguments, program):         # NOTE: No type checking performed.         program.binary_xor()      def jsr(self, arguments, program):         offset = signed2((arguments[0] << 8) + arguments[1])         java_absolute = self.java_position + offset         # Store the address of the next instruction.         program.load_const_ret(self.position_mapping[self.java_position + 3])         program.jump_absolute(self.position_mapping[java_absolute])      def jsr_w(self, arguments, program):         offset = signed4((arguments[0] << 24) + (arguments[1] << 16) + (arguments[2] << 8) + arguments[3])         java_absolute = self.java_position + offset         # Store the address of the next instruction.         program.load_const_ret(self.position_mapping[self.java_position + 5])         program.jump_absolute(self.position_mapping[java_absolute])      l2d = i2d     l2f = i2f      def l2i(self, arguments, program):         pass # Preserving Java semantics      ladd = iadd     laload = iaload     land = iand     lastore = iastore      def lcmp(self, arguments, program):         # NOTE: No type checking performed.         program.dup_topx(2)                 # Stack: value1, value2, value1, value2         program.compare_op(">")             # Stack: value1, value2, result         program.jump_to_label(0, "equals")         # True - produce result and branch.         program.pop_top()                   # Stack: value1, value2         program.pop_top()                   # Stack: value1         program.pop_top()                   # Stack:         program.load_const(1)               # Stack: 1         program.jump_to_label(None, "next")         # False - test equality.         program.start_label("equals")         program.pop_top()                   # Stack: value1, value2         program.dup_topx(2)                 # Stack: value1, value2, value1, value2         program.compare_op("==")            # Stack: value1, value2, result         program.jump_to_label(0, "less")         # True - produce result and branch.         program.pop_top()                   # Stack: value1, value2         program.pop_top()                   # Stack: value1         program.pop_top()                   # Stack:         program.load_const(0)               # Stack: 0         program.jump_to_label(None, "next")         # False - produce result.         program.start_label("less")         program.pop_top()                   # Stack: value1, value2         program.pop_top()                   # Stack: value1         program.pop_top()                   # Stack:         program.load_const(-1)              # Stack: -1         program.start_label("next")      lconst_0 = iconst_0     lconst_1 = iconst_1      def ldc(self, arguments, program):         const = self.class_file.constants[arguments[0] - 1]         if isinstance(const, classfile.StringInfo):             program.use_external_name("java.lang.String")             program.load_global("java")             program.load_attr("lang")             program.load_attr("String")             program.load_const(const.get_value())             program.call_function(1)         else:             program.load_const(const.get_value())      def ldc_w(self, arguments, program):         const = self.class_file.constants[(arguments[0] << 8) + arguments[1] - 1]         if isinstance(const, classfile.StringInfo):             program.use_external_name("java.lang.String")             program.load_global("java")             program.load_attr("lang")             program.load_attr("String")             program.load_const(const.get_value())             program.call_function(1)         else:             program.load_const(const.get_value())      ldc2_w = ldc_w     ldiv = idiv     lload = iload     lload_0 = iload_0     lload_1 = iload_1     lload_2 = iload_2     lload_3 = iload_3     lmul = imul     lneg = ineg      def lookupswitch(self, code, program):          # Find the offset to the next 4 byte boundary in the code.          d, r = divmod(self.java_position + 1, 4)         to_boundary = (4 - r) % 4          # Get the pertinent arguments.          code = code[to_boundary:]         default = classfile.u4(code[0:4])         npairs = classfile.u4(code[4:8])          # Process the pairs.         # NOTE: This is not the most optimal implementation.          pair_index = 8         for pair in range(0, npairs):             match = classfile.u4(code[pair_index:pair_index+4])             offset = classfile.s4(code[pair_index+4:pair_index+8])             # Calculate the branch target.             java_absolute = self.java_position + offset             # Generate branching code.             program.dup_top()                                           # Stack: key, key             program.load_const(match)                                   # Stack: key, key, match             program.compare_op("==")                                    # Stack: key, result             program.jump_to_label(0, "end")             program.pop_top()                                           # Stack: key             program.pop_top()                                           # Stack:             program.jump_absolute(self.position_mapping[java_absolute])             # Generate the label for the end of the branching code.             program.start_label("end")             program.pop_top()                                           # Stack: key             # Update the index.             pair_index += 4          # Generate the default.          java_absolute = self.java_position + default         program.jump_absolute(self.position_mapping[java_absolute])         return pair_index + to_boundary      lor = ior     lrem = irem     lreturn = ireturn     lshl = ishl     lshr = ishr     lstore = istore     lstore_0 = istore_0     lstore_1 = istore_1     lstore_2 = istore_2     lstore_3 = istore_3     lsub = isub     lushr = iushr     lxor = ixor      def monitorenter(self, arguments, program):         # NOTE: To be implemented.         pass      def monitorexit(self, arguments, program):         # NOTE: To be implemented.         pass      def multianewarray(self, arguments, program):         index = (arguments[0] << 8) + arguments[1]         dimensions = arguments[2]         # Stack: count1, ..., countN-1, countN         type_name = self.class_file.constants[index - 1].get_python_name()         default_value = classfile.get_default_for_type(type_name)         self._newarray(program, default_value)  # Stack: count1, ..., countN-1, list         for dimension in range(1, dimensions):             program.rot_two()               # Stack: count1, ..., list, countN-1             program.build_list(0)           # Stack: count1, ..., list, countN-1, new-list             program.rot_three()             # Stack: count1, ..., new-list, list, countN-1             program.setup_loop()             program.load_const(0)           # Stack: count1, ..., new-list, list, countN-1, 0             program.rot_two()               # Stack: count1, ..., new-list, list, 0, countN-1             program.load_global("range")    # Stack: count1, ..., new-list, list, 0, countN-1, range             program.rot_three()             # Stack: count1, ..., new-list, list, range, 0, countN-1             program.call_function(2)        # Stack: count1, ..., new-list, list, range-list             program.get_iter()              # Stack: count1, ..., new-list, list, iter             program.for_iter()              # Stack: count1, ..., new-list, list, iter, value             program.pop_top()               # Stack: count1, ..., new-list, list, iter             program.rot_three()             # Stack: count1, ..., iter, new-list, list             program.slice_0()               # Stack: count1, ..., iter, new-list, list[:]             program.dup_top()               # Stack: count1, ..., iter, new-list, list[:], list[:]             program.rot_three()             # Stack: count1, ..., iter, list[:], new-list, list[:]             program.rot_two()               # Stack: count1, ..., iter, list[:], list[:], new-list             program.dup_top()               # Stack: count1, ..., iter, list[:], list[:], new-list, new-list             program.load_attr("append")     # Stack: count1, ..., iter, list[:], list[:], new-list, append             program.rot_three()             # Stack: count1, ..., iter, list[:], append, list[:], new-list             program.rot_three()             # Stack: count1, ..., iter, list[:], new-list, append, list[:]             program.call_function(1)        # Stack: count1, ..., iter, list[:], new-list, None             program.pop_top()               # Stack: count1, ..., iter, list[:], new-list             program.rot_two()               # Stack: count1, ..., iter, new-list, list[:]             program.rot_three()             # Stack: count1, ..., list[:], iter, new-list             program.rot_three()             # Stack: count1, ..., new-list, list[:], iter             program.end_loop()              # Stack: count1, ..., new-list, list[:], iter             program.pop_top()               # Stack: count1, ..., new-list      def new(self, arguments, program):         # This operation is considered to be the same as the calling of the         # initialisation method of the given class with no arguments.          index = (arguments[0] << 8) + arguments[1]         target_name = self.class_file.constants[index - 1].get_python_name()         program.use_external_name(target_name)          # NOTE: Using the string version of the name which may contain incompatible characters.         program.load_global("object")         program.load_attr("__new__")         load_class_name(self.class_file, target_name, program)         program.call_function(1)      def newarray(self, arguments, program):         # NOTE: Does not raise NegativeArraySizeException.         # NOTE: Not completely using the arguments to type the list/array.         atype = arguments[0]         default_value = get_default_for_atype(atype)         self._newarray(program, default_value)      def nop(self, arguments, program):         pass      def pop(self, arguments, program):         program.pop_top()      pop2 = pop # ignoring Java stack value distinctions      def putfield(self, arguments, program):         index = (arguments[0] << 8) + arguments[1]         target_name = self.class_file.constants[index - 1].get_python_name()         program.rot_two()         # NOTE: Using the string version of the name which may contain incompatible characters.         program.store_attr(str(target_name))      def putstatic(self, arguments, program):         index = (arguments[0] << 8) + arguments[1]         target = self.class_file.constants[index - 1]         target_name = target.get_python_name()          # Get the class name instead of the fully qualified name.          full_class_name = target.get_class().get_python_name()         program.use_external_name(full_class_name)         load_class_name(self.class_file, full_class_name, program)         # NOTE: Using the string version of the name which may contain incompatible characters.         program.store_attr(str(target_name))      def ret(self, arguments, program):         program.ret(arguments[0])         # Indicate that the finally handler is probably over.         # NOTE: This is seemingly not guaranteed.         self.in_finally = 0      def return_(self, arguments, program):         program.load_const(None)         program.return_value()      saload = laload     sastore = lastore      def sipush(self, arguments, program):         program.load_const(signed2((arguments[0] << 8) + arguments[1]))      def swap(self, arguments, program):         program.rot_two()      def tableswitch(self, code, program):          # Find the offset to the next 4 byte boundary in the code.          d, r = divmod(self.java_position + 1, 4)         to_boundary = (4 - r) % 4          # Get the pertinent arguments.          code = code[to_boundary:]         default = classfile.u4(code[0:4])         low = classfile.u4(code[4:8])         high = classfile.u4(code[8:12])          # Process the jump entries.         # NOTE: This is not the most optimal implementation.          jump_index = 12         for jump in range(low, high + 1):             offset = classfile.s4(code[jump_index:jump_index + 4])              # Calculate the branch target.              java_absolute = self.java_position + offset              # Generate branching code.              program.dup_top()                                           # Stack: key, key             program.load_const(jump)                                    # Stack: key, key, jump             program.compare_op("==")                                    # Stack: key, result             program.jump_to_label(0, "end")             program.pop_top()                                           # Stack: key             program.pop_top()                                           # Stack:             program.jump_absolute(self.position_mapping[java_absolute])              # Generate the label for the end of the branching code.              program.start_label("end")             program.pop_top()                                           # Stack: key              # Update the index.              jump_index += 4          # Generate the default.          java_absolute = self.java_position + default         program.jump_absolute(self.position_mapping[java_absolute])         return jump_index + to_boundary      def wide(self, code, program):         # NOTE: To be implemented.         return number_of_arguments  def disassemble(class_file, method):     disassembler = BytecodeDisassembler(class_file)     disassembler.process(method, BytecodeDisassemblerProgram())     return disassembler  class ClassTranslator:      """     A class which provides a wrapper around a class file and the means to     translate the represented class into a Python class.     """      def __init__(self, class_file):          "Initialise the object with the given 'class_file'."          self.class_file = class_file         self.filename = ""          for attribute in self.class_file.attributes:             if isinstance(attribute, classfile.SourceFileAttributeInfo):                 self.filename = str(attribute.get_name())      def translate_method(self, method):          "Translate the given 'method' - an object obtained from the class file."          translator = BytecodeTranslator(self.class_file)         writer = BytecodeWriter()         translator.process(method, writer)         return translator, writer      def make_method(self, real_method_name, methods, global_names, namespace):          """         Make a dispatcher method with the given 'real_method_name', providing         dispatch to the supplied type-sensitive 'methods', accessing the given         'global_names' where necessary, and storing the new method in the         'namespace' provided.         """          if real_method_name == "<init>":             method_name = "__init__"         else:             method_name = real_method_name          # Where only one method exists, just make an alias.          if len(methods) == 1:             method, fn = methods[0]             namespace[method_name] = fn             return          # Write a simple bytecode dispatching mechanism.          program = BytecodeWriter()          # Remember whether any of the methods are static.         # NOTE: This should be an all or nothing situation.          method_is_static = 0          # NOTE: The code below should use dictionary-based dispatch for better performance.          for method, fn in methods:             method_is_static = real_method_name != "<init>" and method_is_static or \                 classfile.has_flags(method.access_flags, [classfile.STATIC])              if method_is_static:                 program.load_fast(0)                # Stack: arguments             else:                 program.load_fast(1)                # Stack: arguments              program.setup_loop()             program.load_const(1)                   # Stack: arguments, 1              if method_is_static:                 program.store_fast(1)               # Stack: arguments (found = 1)             else:                 program.store_fast(2)               # Stack: arguments (found = 1)              # Emit a list of parameter types.              descriptor_types = method.get_descriptor()[0]             for descriptor_type in descriptor_types:                 base_type, object_type, array_type = descriptor_type                 python_type = classfile.descriptor_base_type_mapping[base_type]                 if python_type == "instance":                     # NOTE: This will need extending.                     python_type = object_type                 program.load_global(python_type)    # Stack: arguments, type, ...             program.build_list(len(descriptor_types))                                                     # Stack: arguments, types             # Make a map of arguments and types.             program.load_const(None)                # Stack: arguments, types, None             program.rot_three()                     # Stack: None, arguments, types             program.build_tuple(3)                  # Stack: tuple             program.load_global("map")              # Stack: tuple, map             program.rot_two()                       # Stack: map, tuple             program.call_function_var(0)            # Stack: list (mapping arguments to types)             # Loop over each pair.             program.get_iter()                      # Stack: iter             program.for_iter()                      # Stack: iter, (argument, type)             program.unpack_sequence(2)              # Stack: iter, type, argument             program.dup_top()                       # Stack: iter, type, argument, argument             program.load_const(None)                # Stack: iter, type, argument, argument, None             program.compare_op("is")                # Stack: iter, type, argument, result             # Missing argument?             program.jump_to_label(0, "present")             program.pop_top()                       # Stack: iter, type, argument             program.pop_top()                       # Stack: iter, type             program.pop_top()                       # Stack: iter             program.load_const(0)                   # Stack: iter, 0              if method_is_static:                 program.store_fast(1)               # Stack: iter (found = 0)             else:                 program.store_fast(2)               # Stack: iter (found = 0)              program.break_loop()             # Argument was present.             program.start_label("present")             program.pop_top()                       # Stack: iter, type, argument             program.rot_two()                       # Stack: iter, argument, type             program.dup_top()                       # Stack: iter, argument, type, type             program.load_const(None)                # Stack: iter, argument, type, type, None             program.compare_op("is")                # Stack: iter, argument, type, result             # Missing parameter type?             program.jump_to_label(0, "present")             program.pop_top()                       # Stack: iter, argument, type             program.pop_top()                       # Stack: iter, argument             program.pop_top()                       # Stack: iter             program.load_const(0)                   # Stack: iter, 0              if method_is_static:                 program.store_fast(1)               # Stack: iter (found = 0)             else:                 program.store_fast(2)               # Stack: iter (found = 0)              program.break_loop()             # Parameter was present.             program.start_label("present")             program.pop_top()                       # Stack: iter, argument, type             program.build_tuple(2)                  # Stack: iter, (argument, type)             program.load_global("isinstance")       # Stack: iter, (argument, type), isinstance             program.rot_two()                       # Stack: iter, isinstance, (argument, type)             program.call_function_var(0)            # Stack: iter, result             program.jump_to_label(1, "match")             program.pop_top()                       # Stack: iter             program.load_const(0)                   # Stack: iter, 0              if method_is_static:                 program.store_fast(1)               # Stack: iter (found = 0)             else:                 program.store_fast(2)               # Stack: iter (found = 0)              program.break_loop()             # Argument type and parameter type matched.             program.start_label("match")             program.pop_top()                       # Stack: iter             program.end_loop()                      # Stack:             # If all the parameters matched, call the method.              if method_is_static:                 program.load_fast(1)                # Stack: match             else:                 program.load_fast(2)                # Stack: match              program.jump_to_label(0, "failed")             # All the parameters matched.             program.pop_top()                       # Stack:              if method_is_static:                 program.load_fast(0)                # Stack: arguments                 program.load_global(str(self.class_file.this_class.get_python_name()))                                                     # Stack: arguments, class             else:                 program.load_fast(1)                # Stack: arguments                 program.load_fast(0)                # Stack: arguments, self              program.load_attr(str(method.get_python_name()))                                                     # Stack: arguments, method             program.rot_two()                       # Stack: method, arguments             program.call_function_var(0)            # Stack: result             program.return_value()             # Try the next method if arguments or parameters were missing or incorrect.             program.start_label("failed")             program.pop_top()                       # Stack:          # Raise an exception if nothing matched.         # NOTE: Improve this.          program.load_const("No matching method")         program.raise_varargs(1)         program.load_const(None)         program.return_value()          # Add the code as a method in the namespace.         # NOTE: One actual parameter, flags as 71 apparently means that a list         # NOTE: parameter is used in a method.          if method_is_static:             nargs = 0         else:             nargs = 1         nlocals = program.max_locals + 1          code = new.code(nargs, nlocals, program.max_stack_depth, 71, program.get_output(),             tuple(program.get_constants()), tuple(program.get_names()), tuple(self.make_varnames(nlocals, method_is_static)),             self.filename, method_name, 0, "")         fn = new.function(code, global_names)          if method_is_static:             fn = staticmethod(fn)          namespace[method_name] = fn      def process(self, global_names):          """         Process the class, storing it in the 'global_names' dictionary provided.         Return a tuple containing the class and a list of external names         referenced by the class's methods.         """          namespace = {}          # Make the fields.          for field in self.class_file.fields:             if classfile.has_flags(field.access_flags, [classfile.STATIC]):                 field_name = str(field.get_python_name())                 namespace[field_name] = None          # Make the methods.          real_methods = {}         external_names = []          for method in self.class_file.methods:             real_method_name = str(method.get_name())             method_name = str(method.get_python_name())              translator, writer = self.translate_method(method)              # Add external names to the master list.              for external_name in writer.external_names:                 if external_name not in external_names:                     external_names.append(external_name)              # Fix up special class initialisation methods and static methods.              method_is_static = real_method_name != "<init>" and classfile.has_flags(method.access_flags, [classfile.STATIC])             if method_is_static:                 nargs = len(method.get_descriptor()[0])             else:                 nargs = len(method.get_descriptor()[0]) + 1             nlocals = writer.max_locals + 1             flags = 67              # NOTE: Add line number table later.              code = new.code(nargs, nlocals, writer.max_stack_depth, flags, writer.get_output(),                 tuple(writer.get_constants()), tuple(writer.get_names()),                 tuple(self.make_varnames(nlocals, method_is_static)), self.filename, method_name, 0, "")              # NOTE: May need more globals.              fn = new.function(code, global_names)              # Fix up special class initialisation methods and static methods.              if method_is_static:                 fn = staticmethod(fn)              # Remember the real method name and the corresponding methods produced.              if not real_methods.has_key(real_method_name):                 real_methods[real_method_name] = []             real_methods[real_method_name].append((method, fn))              # Add the method to the class's namespace.              namespace[method_name] = fn          # Define superclasses.          bases = self.get_base_classes(global_names)          # Define method dispatchers.          for real_method_name, methods in real_methods.items():             if real_method_name != "<clinit>":                 self.make_method(real_method_name, methods, global_names, namespace)          # Use only the last part of the fully qualified name.          full_class_name = str(self.class_file.this_class.get_python_name())         class_name = full_class_name.split(".")[-1]         cls = new.classobj(class_name, bases, namespace)         global_names[cls.__name__] = cls          return cls, external_names      def get_base_classes(self, global_names):          """         Identify the superclass, then either load it from the given         'global_names' if available, or import the class from its parent module.         Return a tuple containing all base classes (typically a single element         tuple).         """          original_name = str(self.class_file.super_class.get_name())         full_this_class_name = str(self.class_file.this_class.get_python_name())         this_class_name_parts = full_this_class_name.split(".")         this_class_module_name = ".".join(this_class_name_parts[:-1])         full_super_class_name = str(self.class_file.super_class.get_python_name())         super_class_name_parts = full_super_class_name.split(".")         super_class_name = super_class_name_parts[-1]         super_class_module_name = ".".join(super_class_name_parts[:-1])         if super_class_module_name == "":             obj = global_names[super_class_name]         elif super_class_module_name == this_class_module_name:             obj = global_names[super_class_name]         else:             #print "Importing", super_class_module_name, super_class_name             obj = __import__(super_class_module_name, global_names, {}, [])             for super_class_name_part in super_class_name_parts[1:] or [super_class_name]:                 #print "*", obj, super_class_name_part                 obj = getattr(obj, super_class_name_part)         return (obj,)      def make_varnames(self, nlocals, method_is_static=0):          """         A utility method which invents variable names for the given number -         'nlocals' - of local variables in a method. Returns a list of such         variable names.          If the optional 'method_is_static' is set to true, do not use "self" as         the first argument name.         """          if method_is_static:             l = ["cls"]         else:             l = ["self"]         for i in range(1, nlocals):             l.append("_l%s" % i)         return l[:nlocals]  # Test functions, useful for tracing generated bytecode operations.  def _map(*args):     print args     return apply(__builtins__.map, args)  def _isinstance(*args):     print args     return apply(__builtins__.isinstance, args)  if __name__ == "__main__":     import sys     import dis     global_names = globals()     #global_names["isinstance"] = _isinstance     #global_names["map"] = _map     for filename in sys.argv[1:]:         f = open(filename, "rb")         c = classfile.ClassFile(f.read())         translator = ClassTranslator(c)         cls, external_names = translator.process(global_names)  # vim: tabstop=4 expandtab shiftwidth=4