# uncompyle6 version 3.2.3
# Python bytecode 3.6 (3379)
# Decompiled from: Python 3.6.8 |Anaconda custom (64-bit)| (default, Feb 21 2019, 18:30:04) [MSC v.1916 64 bit (AMD64)]
# Embedded file name: dis.py
"""Disassembler of Python byte code into mnemonics."""
import sys, types, collections, io
from opcode import *
from opcode import __all__ as _opcodes_all

__all__ = [
    "code_info",
    "dis",
    "disassemble",
    "distb",
    "disco",
    "findlinestarts",
    "findlabels",
    "show_code",
    "get_instructions",
    "Instruction",
    "Bytecode",
] + _opcodes_all
del _opcodes_all
_have_code = (
    types.MethodType,
    types.FunctionType,
    types.CodeType,
    classmethod,
    staticmethod,
    type,
)
FORMAT_VALUE = opmap["FORMAT_VALUE"]


def _try_compile(source, name):
    """Attempts to compile the given source, first as an expression and
       then as a statement if the first approach fails.
    
       Utility function to accept strings in functions that otherwise
       expect code objects
    """
    try:
        c = compile(source, name, "eval")
    except SyntaxError:
        c = compile(source, name, "exec")

    return c


def dis(x=None, *, file=None):
    """Disassemble classes, methods, functions, generators, or code.
    
    With no argument, disassemble the last traceback.
    
    """
    if x is None:
        distb(file=file)
        return
    if hasattr(x, "__func__"):
        x = x.__func__
    if hasattr(x, "__code__"):
        x = x.__code__
    if hasattr(x, "gi_code"):
        x = x.gi_code
    if hasattr(x, "__dict__"):
        items = sorted(x.__dict__.items())
        for name, x1 in items:
            if isinstance(x1, _have_code):
                print("Disassembly of %s:" % name, file=file)
                try:
                    dis(x1, file=file)
                except TypeError as msg:
                    print("Sorry:", msg, file=file)

                print(file=file)

    else:
        if hasattr(x, "co_code"):
            disassemble(x, file=file)
        else:
            if isinstance(x, (bytes, bytearray)):
                _disassemble_bytes(x, file=file)
            else:
                if isinstance(x, str):
                    _disassemble_str(x, file=file)
                else:
                    raise TypeError(
                        "don't know how to disassemble %s objects" % type(x).__name__
                    )


def distb(tb=None, *, file=None):
    """Disassemble a traceback (default: last traceback)."""
    if tb is None:
        try:
            tb = sys.last_traceback
        except AttributeError:
            raise RuntimeError("no last traceback to disassemble")

        while tb.tb_next:
            tb = tb.tb_next

    disassemble(tb.tb_frame.f_code, tb.tb_lasti, file=file)


COMPILER_FLAG_NAMES = {
    1: "OPTIMIZED",
    2: "NEWLOCALS",
    4: "VARARGS",
    8: "VARKEYWORDS",
    16: "NESTED",
    32: "GENERATOR",
    64: "NOFREE",
    128: "COROUTINE",
    256: "ITERABLE_COROUTINE",
    512: "ASYNC_GENERATOR",
}


def pretty_flags(flags):
    """Return pretty representation of code flags."""
    names = []
    for i in range(32):
        flag = 1 << i
        if flags & flag:
            names.append(COMPILER_FLAG_NAMES.get(flag, hex(flag)))
            flags ^= flag
            if not flags:
                break
    else:
        names.append(hex(flags))

    return (", ").join(names)


def _get_code_object(x):
    """Helper to handle methods, functions, generators, strings and raw code objects"""
    if hasattr(x, "__func__"):
        x = x.__func__
    if hasattr(x, "__code__"):
        x = x.__code__
    if hasattr(x, "gi_code"):
        x = x.gi_code
    if isinstance(x, str):
        x = _try_compile(x, "<disassembly>")
    if hasattr(x, "co_code"):
        return x
    raise TypeError("don't know how to disassemble %s objects" % type(x).__name__)


def code_info(x):
    """Formatted details of methods, functions, or code."""
    return _format_code_info(_get_code_object(x))


def _format_code_info(co):
    lines = []
    lines.append("Name:              %s" % co.co_name)
    lines.append("Filename:          %s" % co.co_filename)
    lines.append("Argument count:    %s" % co.co_argcount)
    lines.append("Kw-only arguments: %s" % co.co_kwonlyargcount)
    lines.append("Number of locals:  %s" % co.co_nlocals)
    lines.append("Stack size:        %s" % co.co_stacksize)
    lines.append("Flags:             %s" % pretty_flags(co.co_flags))
    if co.co_consts:
        lines.append("Constants:")
        for i_c in enumerate(co.co_consts):
            lines.append("%4d: %r" % i_c)

    if co.co_names:
        lines.append("Names:")
        for i_n in enumerate(co.co_names):
            lines.append("%4d: %s" % i_n)

    if co.co_varnames:
        lines.append("Variable names:")
        for i_n in enumerate(co.co_varnames):
            lines.append("%4d: %s" % i_n)

    if co.co_freevars:
        lines.append("Free variables:")
        for i_n in enumerate(co.co_freevars):
            lines.append("%4d: %s" % i_n)

    if co.co_cellvars:
        lines.append("Cell variables:")
        for i_n in enumerate(co.co_cellvars):
            lines.append("%4d: %s" % i_n)

    return ("\n").join(lines)


def show_code(co, *, file=None):
    """Print details of methods, functions, or code to *file*.
    
    If *file* is not provided, the output is printed on stdout.
    """
    print(code_info(co), file=file)


_Instruction = collections.namedtuple(
    "_Instruction", "opname opcode arg argval argrepr offset starts_line is_jump_target"
)
_Instruction.opname.__doc__ = "Human readable name for operation"
_Instruction.opcode.__doc__ = "Numeric code for operation"
_Instruction.arg.__doc__ = "Numeric argument to operation (if any), otherwise None"
_Instruction.argval.__doc__ = "Resolved arg value (if known), otherwise same as arg"
_Instruction.argrepr.__doc__ = "Human readable description of operation argument"
_Instruction.offset.__doc__ = "Start index of operation within bytecode sequence"
_Instruction.starts_line.__doc__ = (
    "Line started by this opcode (if any), otherwise None"
)
_Instruction.is_jump_target.__doc__ = (
    "True if other code jumps to here, otherwise False"
)


class Instruction(_Instruction):
    """Details for a bytecode operation
    
       Defined fields:
         opname - human readable name for operation
         opcode - numeric code for operation
         arg - numeric argument to operation (if any), otherwise None
         argval - resolved arg value (if known), otherwise same as arg
         argrepr - human readable description of operation argument
         offset - start index of operation within bytecode sequence
         starts_line - line started by this opcode (if any), otherwise None
         is_jump_target - True if other code jumps to here, otherwise False
    """

    def _disassemble(self, lineno_width=3, mark_as_current=False):
        """Format instruction details for inclusion in disassembly output
        
        *lineno_width* sets the width of the line number field (0 omits it)
        *mark_as_current* inserts a '-->' marker arrow as part of the line
        """
        fields = []
        if lineno_width:
            if self.starts_line is not None:
                lineno_fmt = "%%%dd" % lineno_width
                fields.append(lineno_fmt % self.starts_line)
            else:
                fields.append(" " * lineno_width)
            if mark_as_current:
                fields.append("-->")
            else:
                fields.append("   ")
            if self.is_jump_target:
                fields.append(">>")
            else:
                fields.append("  ")
            fields.append(repr(self.offset).rjust(4))
            fields.append(self.opname.ljust(20))
            if self.arg is not None:
                fields.append(repr(self.arg).rjust(5))
                if self.argrepr:
                    fields.append("(" + self.argrepr + ")")
            return (" ").join(fields).rstrip()


def get_instructions(x, *, first_line=None):
    """Iterator for the opcodes in methods, functions or code
    
    Generates a series of Instruction named tuples giving the details of
    each operations in the supplied code.
    
    If *first_line* is not None, it indicates the line number that should
    be reported for the first source line in the disassembled code.
    Otherwise, the source line information (if any) is taken directly from
    the disassembled code object.
    """
    co = _get_code_object(x)
    cell_names = co.co_cellvars + co.co_freevars
    linestarts = dict(findlinestarts(co))
    if first_line is not None:
        line_offset = first_line - co.co_firstlineno
    else:
        line_offset = 0
    return _get_instructions_bytes(
        co.co_code,
        co.co_varnames,
        co.co_names,
        co.co_consts,
        cell_names,
        linestarts,
        line_offset,
    )


def _get_const_info(const_index, const_list):
    """Helper to get optional details about const references
    
       Returns the dereferenced constant and its repr if the constant
       list is defined.
       Otherwise returns the constant index and its repr().
    """
    argval = const_index
    if const_list is not None:
        argval = const_list[const_index]
    return (argval, repr(argval))


def _get_name_info(name_index, name_list):
    """Helper to get optional details about named references
    
       Returns the dereferenced name as both value and repr if the name
       list is defined.
       Otherwise returns the name index and its repr().
    """
    argval = name_index
    if name_list is not None:
        argval = name_list[name_index]
        argrepr = argval
    else:
        argrepr = repr(argval)
    return (argval, argrepr)


def _get_instructions_bytes(
    code,
    varnames=None,
    names=None,
    constants=None,
    cells=None,
    linestarts=None,
    line_offset=0,
):
    """Iterate over the instructions in a bytecode string.
    
    Generates a sequence of Instruction namedtuples giving the details of each
    opcode.  Additional information about the code's runtime environment
    (e.g. variable names, constants) can be specified using optional
    arguments.
    
    """
    labels = findlabels(code)
    starts_line = None
    for offset, op, arg in _unpack_opargs(code):
        if linestarts is not None:
            starts_line = linestarts.get(offset, None)
            if starts_line is not None:
                starts_line += line_offset
        is_jump_target = offset in labels
        argval = None
        argrepr = ""
        if arg is not None:
            argval = arg
            if op in hasconst:
                argval, argrepr = _get_const_info(arg, constants)
            else:
                if op in hasname:
                    argval, argrepr = _get_name_info(arg, names)
                else:
                    if op in hasjrel:
                        argval = offset + 2 + arg
                        argrepr = "to " + repr(argval)
                    else:
                        if op in haslocal:
                            argval, argrepr = _get_name_info(arg, varnames)
                        else:
                            if op in hascompare:
                                argval = cmp_op[arg]
                                argrepr = argval
                            else:
                                if op in hasfree:
                                    argval, argrepr = _get_name_info(arg, cells)
                                else:
                                    if op == FORMAT_VALUE:
                                        argval = (
                                            (None, str, repr, ascii)[arg & 3],
                                            bool(arg & 4),
                                        )
                                        argrepr = ("", "str", "repr", "ascii")[arg & 3]
                                        if argval[1]:
                                            if argrepr:
                                                argrepr += ", "
                                            argrepr += "with format"
                                yield Instruction(
                                    opname[op],
                                    op,
                                    arg,
                                    argval,
                                    argrepr,
                                    offset,
                                    starts_line,
                                    is_jump_target,
                                )


def disassemble(co, lasti=-1, *, file=None):
    """Disassemble a code object."""
    cell_names = co.co_cellvars + co.co_freevars
    linestarts = dict(findlinestarts(co))
    _disassemble_bytes(
        co.co_code,
        lasti,
        co.co_varnames,
        co.co_names,
        co.co_consts,
        cell_names,
        linestarts,
        file=file,
    )


def _disassemble_bytes(
    code,
    lasti=-1,
    varnames=None,
    names=None,
    constants=None,
    cells=None,
    linestarts=None,
    *,
    file=None,
    line_offset=0
):
    show_lineno = linestarts is not None
    lineno_width = 3 if show_lineno else 0
    for instr in _get_instructions_bytes(
        code, varnames, names, constants, cells, linestarts, line_offset=line_offset
    ):
        new_source_line = (
            show_lineno and instr.starts_line is not None and instr.offset > 0
        )
        if new_source_line:
            print(file=file)
        is_current_instr = instr.offset == lasti
        print(instr._disassemble(lineno_width, is_current_instr), file=file)


def _disassemble_str(source, *, file=None):
    """Compile the source string, then disassemble the code object."""
    disassemble(_try_compile(source, "<dis>"), file=file)


disco = disassemble


def _unpack_opargs(code):
    extended_arg = 0
    for i in range(0, len(code), 2):
        op = code[i]
        if op >= HAVE_ARGUMENT:
            arg = code[i + 1] | extended_arg
            extended_arg = arg << 8 if op == EXTENDED_ARG else 0
        else:
            arg = None
        yield (i, op, arg)


def findlabels(code):
    """Detect all offsets in a byte code which are jump targets.
    
    Return the list of offsets.
    
    """
    labels = []
    for offset, op, arg in _unpack_opargs(code):
        if arg is not None:
            if op in hasjrel:
                label = offset + 2 + arg
            else:
                if op in hasjabs:
                    label = arg
                else:
                    continue
                if label not in labels:
                    labels.append(label)

    return labels


def findlinestarts(code):
    """Find the offsets in a byte code which are start of lines in the source.
    
    Generate pairs (offset, lineno) as described in Python/compile.c.
    
    """
    byte_increments = code.co_lnotab[0::2]
    line_increments = code.co_lnotab[1::2]
    lastlineno = None
    lineno = code.co_firstlineno
    addr = 0
    for byte_incr, line_incr in zip(byte_increments, line_increments):
        if byte_incr:
            if lineno != lastlineno:
                yield (addr, lineno)
                lastlineno = lineno
            addr += byte_incr
        if line_incr >= 128:
            line_incr -= 256
        lineno += line_incr

    if lineno != lastlineno:
        yield (addr, lineno)


class Bytecode:
    """The bytecode operations of a piece of code
    
    Instantiate this with a function, method, string of code, or a code object
    (as returned by compile()).
    
    Iterating over this yields the bytecode operations as Instruction instances.
    """

    def __init__(self, x, *, first_line=None, current_offset=None):
        self.codeobj = co = _get_code_object(x)
        if first_line is None:
            self.first_line = co.co_firstlineno
            self._line_offset = 0
        else:
            self.first_line = first_line
            self._line_offset = first_line - co.co_firstlineno
        self._cell_names = co.co_cellvars + co.co_freevars
        self._linestarts = dict(findlinestarts(co))
        self._original_object = x
        self.current_offset = current_offset

    def __iter__(self):
        co = self.codeobj
        return _get_instructions_bytes(
            co.co_code,
            co.co_varnames,
            co.co_names,
            co.co_consts,
            self._cell_names,
            self._linestarts,
            line_offset=self._line_offset,
        )

    def __repr__(self):
        return ("{}({!r})").format(self.__class__.__name__, self._original_object)

    @classmethod
    def from_traceback(cls, tb):
        """ Construct a Bytecode from the given traceback """
        while tb.tb_next:
            tb = tb.tb_next

        return cls(tb.tb_frame.f_code, current_offset=tb.tb_lasti)

    def info(self):
        """Return formatted information about the code object."""
        return _format_code_info(self.codeobj)

    def dis(self):
        """Return a formatted view of the bytecode operations."""
        co = self.codeobj
        if self.current_offset is not None:
            offset = self.current_offset
        else:
            offset = -1
        with io.StringIO() as (output):
            _disassemble_bytes(
                co.co_code,
                varnames=co.co_varnames,
                names=co.co_names,
                constants=co.co_consts,
                cells=self._cell_names,
                linestarts=self._linestarts,
                line_offset=self._line_offset,
                file=output,
                lasti=offset,
            )
            return output.getvalue()


def _test():
    """Simple test program to disassemble a file."""
    import argparse

    parser = argparse.ArgumentParser()
    parser.add_argument("infile", type=argparse.FileType(), nargs="?", default="-")
    args = parser.parse_args()
    with args.infile as (infile):
        source = infile.read()
    code = compile(source, args.infile.name, "exec")
    dis(code)


if __name__ == "__main__":
    _test()