.. module:: dis :synopsis: Disassembler for Python bytecode.
Source code: :source:`Lib/dis.py`
The :mod:`dis` module supports the analysis of CPython :term:`bytecode` by disassembling it. The CPython bytecode which this module takes as an input is defined in the file :file:`Include/opcode.h` and used by the compiler and the interpreter.
.. impl-detail:: Bytecode is an implementation detail of the CPython interpreter. No guarantees are made that bytecode will not be added, removed, or changed between versions of Python. Use of this module should not be considered to work across Python VMs or Python releases. .. versionchanged:: 3.6 Use 2 bytes for each instruction. Previously the number of bytes varied by instruction.
Example: Given the function :func:`myfunc`:
def myfunc(alist): return len(alist)
the following command can be used to display the disassembly of :func:`myfunc`:
>>> dis.dis(myfunc) 2 0 LOAD_GLOBAL 0 (len) 2 LOAD_FAST 0 (alist) 4 CALL_FUNCTION 1 6 RETURN_VALUE
(The "2" is a line number).
.. versionadded:: 3.4
The bytecode analysis API allows pieces of Python code to be wrapped in a :class:`Bytecode` object that provides easy access to details of the compiled code.
Example:
>>> bytecode = dis.Bytecode(myfunc) >>> for instr in bytecode: ... print(instr.opname) ... LOAD_GLOBAL LOAD_FAST CALL_FUNCTION RETURN_VALUE
The :mod:`dis` module also defines the following analysis functions that convert the input directly to the desired output. They can be useful if only a single operation is being performed, so the intermediate analysis object isn't useful:
.. function:: code_info(x) Return a formatted multi-line string with detailed code object information for the supplied function, generator, asynchronous generator, coroutine, method, source code string or code object. Note that the exact contents of code info strings are highly implementation dependent and they may change arbitrarily across Python VMs or Python releases. .. versionadded:: 3.2 .. versionchanged:: 3.7 This can now handle coroutine and asynchronous generator objects.
.. function:: show_code(x, *, file=None) Print detailed code object information for the supplied function, method, source code string or code object to *file* (or ``sys.stdout`` if *file* is not specified). This is a convenient shorthand for ``print(code_info(x), file=file)``, intended for interactive exploration at the interpreter prompt. .. versionadded:: 3.2 .. versionchanged:: 3.4 Added *file* parameter.
.. function:: dis(x=None, *, file=None, depth=None) Disassemble the *x* object. *x* can denote either a module, a class, a method, a function, a generator, an asynchronous generator, a coroutine, a code object, a string of source code or a byte sequence of raw bytecode. For a module, it disassembles all functions. For a class, it disassembles all methods (including class and static methods). For a code object or sequence of raw bytecode, it prints one line per bytecode instruction. It also recursively disassembles nested code objects (the code of comprehensions, generator expressions and nested functions, and the code used for building nested classes). Strings are first compiled to code objects with the :func:`compile` built-in function before being disassembled. If no object is provided, this function disassembles the last traceback. The disassembly is written as text to the supplied *file* argument if provided and to ``sys.stdout`` otherwise. The maximal depth of recursion is limited by *depth* unless it is ``None``. ``depth=0`` means no recursion. .. versionchanged:: 3.4 Added *file* parameter. .. versionchanged:: 3.7 Implemented recursive disassembling and added *depth* parameter. .. versionchanged:: 3.7 This can now handle coroutine and asynchronous generator objects.
.. function:: distb(tb=None, *, file=None) Disassemble the top-of-stack function of a traceback, using the last traceback if none was passed. The instruction causing the exception is indicated. The disassembly is written as text to the supplied *file* argument if provided and to ``sys.stdout`` otherwise. .. versionchanged:: 3.4 Added *file* parameter.
.. function:: disassemble(code, lasti=-1, *, file=None) disco(code, lasti=-1, *, file=None) Disassemble a code object, indicating the last instruction if *lasti* was provided. The output is divided in the following columns: #. the line number, for the first instruction of each line #. the current instruction, indicated as ``-->``, #. a labelled instruction, indicated with ``>>``, #. the address of the instruction, #. the operation code name, #. operation parameters, and #. interpretation of the parameters in parentheses. The parameter interpretation recognizes local and global variable names, constant values, branch targets, and compare operators. The disassembly is written as text to the supplied *file* argument if provided and to ``sys.stdout`` otherwise. .. versionchanged:: 3.4 Added *file* parameter.
.. function:: get_instructions(x, *, first_line=None) Return an iterator over the instructions in the supplied function, method, source code string or code object. The iterator generates a series of :class:`Instruction` named tuples giving the details of each operation 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. .. versionadded:: 3.4
.. function:: findlinestarts(code) This generator function uses the ``co_firstlineno`` and ``co_lnotab`` attributes of the code object *code* to find the offsets which are starts of lines in the source code. They are generated as ``(offset, lineno)`` pairs. See :source:`Objects/lnotab_notes.txt` for the ``co_lnotab`` format and how to decode it. .. versionchanged:: 3.6 Line numbers can be decreasing. Before, they were always increasing.
.. function:: findlabels(code) Detect all offsets in the code object *code* which are jump targets, and return a list of these offsets.
.. function:: stack_effect(opcode, oparg=None, *, jump=None) Compute the stack effect of *opcode* with argument *oparg*. If the code has a jump target and *jump* is ``True``, :func:`~stack_effect` will return the stack effect of jumping. If *jump* is ``False``, it will return the stack effect of not jumping. And if *jump* is ``None`` (default), it will return the maximal stack effect of both cases. .. versionadded:: 3.4 .. versionchanged:: 3.8 Added *jump* parameter.
The :func:`get_instructions` function and :class:`Bytecode` class provide details of bytecode instructions as :class:`Instruction` instances:
Details for a bytecode operation
.. data:: opcode numeric code for operation, corresponding to the opcode values listed below and the bytecode values in the :ref:`opcode_collections`.
.. data:: opname human readable name for operation
.. data:: arg numeric argument to operation (if any), otherwise ``None``
.. data:: argval resolved arg value (if known), otherwise same as arg
.. data:: argrepr human readable description of operation argument
.. data:: offset start index of operation within bytecode sequence
.. data:: starts_line line started by this opcode (if any), otherwise ``None``
.. data:: is_jump_target ``True`` if other code jumps to here, otherwise ``False``
.. versionadded:: 3.4
The Python compiler currently generates the following bytecode instructions.
General instructions
.. opcode:: NOP Do nothing code. Used as a placeholder by the bytecode optimizer.
.. opcode:: POP_TOP Removes the top-of-stack (TOS) item.
.. opcode:: ROT_TWO Swaps the two top-most stack items.
.. opcode:: ROT_THREE Lifts second and third stack item one position up, moves top down to position three.
.. opcode:: ROT_FOUR Lifts second, third and forth stack items one position up, moves top down to position four. .. versionadded:: 3.8
.. opcode:: DUP_TOP Duplicates the reference on top of the stack. .. versionadded:: 3.2
.. opcode:: DUP_TOP_TWO Duplicates the two references on top of the stack, leaving them in the same order. .. versionadded:: 3.2
Unary operations
Unary operations take the top of the stack, apply the operation, and push the result back on the stack.
.. opcode:: UNARY_POSITIVE Implements ``TOS = +TOS``.
.. opcode:: UNARY_NEGATIVE Implements ``TOS = -TOS``.
.. opcode:: UNARY_NOT Implements ``TOS = not TOS``.
.. opcode:: UNARY_INVERT Implements ``TOS = ~TOS``.
.. opcode:: GET_ITER Implements ``TOS = iter(TOS)``.
.. opcode:: GET_YIELD_FROM_ITER If ``TOS`` is a :term:`generator iterator` or :term:`coroutine` object it is left as is. Otherwise, implements ``TOS = iter(TOS)``. .. versionadded:: 3.5
Binary operations
Binary operations remove the top of the stack (TOS) and the second top-most stack item (TOS1) from the stack. They perform the operation, and put the result back on the stack.
.. opcode:: BINARY_POWER Implements ``TOS = TOS1 ** TOS``.
.. opcode:: BINARY_MULTIPLY Implements ``TOS = TOS1 * TOS``.
.. opcode:: BINARY_MATRIX_MULTIPLY Implements ``TOS = TOS1 @ TOS``. .. versionadded:: 3.5
.. opcode:: BINARY_FLOOR_DIVIDE Implements ``TOS = TOS1 // TOS``.
.. opcode:: BINARY_TRUE_DIVIDE Implements ``TOS = TOS1 / TOS``.
.. opcode:: BINARY_MODULO Implements ``TOS = TOS1 % TOS``.
.. opcode:: BINARY_ADD Implements ``TOS = TOS1 + TOS``.
.. opcode:: BINARY_SUBTRACT Implements ``TOS = TOS1 - TOS``.
.. opcode:: BINARY_SUBSCR Implements ``TOS = TOS1[TOS]``.
.. opcode:: BINARY_LSHIFT Implements ``TOS = TOS1 << TOS``.
.. opcode:: BINARY_RSHIFT Implements ``TOS = TOS1 >> TOS``.
.. opcode:: BINARY_AND Implements ``TOS = TOS1 & TOS``.
.. opcode:: BINARY_XOR Implements ``TOS = TOS1 ^ TOS``.
.. opcode:: BINARY_OR Implements ``TOS = TOS1 | TOS``.
In-place operations
In-place operations are like binary operations, in that they remove TOS and TOS1, and push the result back on the stack, but the operation is done in-place when TOS1 supports it, and the resulting TOS may be (but does not have to be) the original TOS1.
.. opcode:: INPLACE_POWER Implements in-place ``TOS = TOS1 ** TOS``.
.. opcode:: INPLACE_MULTIPLY Implements in-place ``TOS = TOS1 * TOS``.
.. opcode:: INPLACE_MATRIX_MULTIPLY Implements in-place ``TOS = TOS1 @ TOS``. .. versionadded:: 3.5
.. opcode:: INPLACE_FLOOR_DIVIDE Implements in-place ``TOS = TOS1 // TOS``.
.. opcode:: INPLACE_TRUE_DIVIDE Implements in-place ``TOS = TOS1 / TOS``.
.. opcode:: INPLACE_MODULO Implements in-place ``TOS = TOS1 % TOS``.
.. opcode:: INPLACE_ADD Implements in-place ``TOS = TOS1 + TOS``.
.. opcode:: INPLACE_SUBTRACT Implements in-place ``TOS = TOS1 - TOS``.
.. opcode:: INPLACE_LSHIFT Implements in-place ``TOS = TOS1 << TOS``.
.. opcode:: INPLACE_RSHIFT Implements in-place ``TOS = TOS1 >> TOS``.
.. opcode:: INPLACE_AND Implements in-place ``TOS = TOS1 & TOS``.
.. opcode:: INPLACE_XOR Implements in-place ``TOS = TOS1 ^ TOS``.
.. opcode:: INPLACE_OR Implements in-place ``TOS = TOS1 | TOS``.
.. opcode:: STORE_SUBSCR Implements ``TOS1[TOS] = TOS2``.
.. opcode:: DELETE_SUBSCR Implements ``del TOS1[TOS]``.
Coroutine opcodes
.. opcode:: GET_AWAITABLE Implements ``TOS = get_awaitable(TOS)``, where ``get_awaitable(o)`` returns ``o`` if ``o`` is a coroutine object or a generator object with the CO_ITERABLE_COROUTINE flag, or resolves ``o.__await__``. .. versionadded:: 3.5
.. opcode:: GET_AITER Implements ``TOS = TOS.__aiter__()``. .. versionadded:: 3.5 .. versionchanged:: 3.7 Returning awaitable objects from ``__aiter__`` is no longer supported.
.. opcode:: GET_ANEXT Implements ``PUSH(get_awaitable(TOS.__anext__()))``. See ``GET_AWAITABLE`` for details about ``get_awaitable`` .. versionadded:: 3.5
.. opcode:: END_ASYNC_FOR Terminates an :keyword:`async for` loop. Handles an exception raised when awaiting a next item. If TOS is :exc:`StopAsyncIteration` pop 7 values from the stack and restore the exception state using the second three of them. Otherwise re-raise the exception using the three values from the stack. An exception handler block is removed from the block stack. .. versionadded:: 3.8
.. opcode:: BEFORE_ASYNC_WITH Resolves ``__aenter__`` and ``__aexit__`` from the object on top of the stack. Pushes ``__aexit__`` and result of ``__aenter__()`` to the stack. .. versionadded:: 3.5
.. opcode:: SETUP_ASYNC_WITH Creates a new frame object. .. versionadded:: 3.5
Miscellaneous opcodes
.. opcode:: PRINT_EXPR Implements the expression statement for the interactive mode. TOS is removed from the stack and printed. In non-interactive mode, an expression statement is terminated with :opcode:`POP_TOP`.
.. opcode:: SET_ADD (i) Calls ``set.add(TOS1[-i], TOS)``. Used to implement set comprehensions.
.. opcode:: LIST_APPEND (i) Calls ``list.append(TOS[-i], TOS)``. Used to implement list comprehensions.
.. opcode:: MAP_ADD (i) Calls ``dict.__setitem__(TOS1[-i], TOS1, TOS)``. Used to implement dict comprehensions. .. versionadded:: 3.1 .. versionchanged:: 3.8 Map value is TOS and map key is TOS1. Before, those were reversed.
For all of the :opcode:`SET_ADD`, :opcode:`LIST_APPEND` and :opcode:`MAP_ADD` instructions, while the added value or key/value pair is popped off, the container object remains on the stack so that it is available for further iterations of the loop.
.. opcode:: RETURN_VALUE Returns with TOS to the caller of the function.
.. opcode:: YIELD_VALUE Pops TOS and yields it from a :term:`generator`.
.. opcode:: YIELD_FROM Pops TOS and delegates to it as a subiterator from a :term:`generator`. .. versionadded:: 3.3
.. opcode:: SETUP_ANNOTATIONS Checks whether ``__annotations__`` is defined in ``locals()``, if not it is set up to an empty ``dict``. This opcode is only emitted if a class or module body contains :term:`variable annotations <variable annotation>` statically. .. versionadded:: 3.6
.. opcode:: IMPORT_STAR Loads all symbols not starting with ``'_'`` directly from the module TOS to the local namespace. The module is popped after loading all names. This opcode implements ``from module import *``.
.. opcode:: POP_BLOCK Removes one block from the block stack. Per frame, there is a stack of blocks, denoting :keyword:`try` statements, and such.
.. opcode:: POP_EXCEPT Removes one block from the block stack. The popped block must be an exception handler block, as implicitly created when entering an except handler. In addition to popping extraneous values from the frame stack, the last three popped values are used to restore the exception state.
.. opcode:: POP_FINALLY (preserve_tos) Cleans up the value stack and the block stack. If *preserve_tos* is not ``0`` TOS first is popped from the stack and pushed on the stack after performing other stack operations: * If TOS is ``NULL`` or an integer (pushed by :opcode:`BEGIN_FINALLY` or :opcode:`CALL_FINALLY`) it is popped from the stack. * If TOS is an exception type (pushed when an exception has been raised) 6 values are popped from the stack, the last three popped values are used to restore the exception state. An exception handler block is removed from the block stack. It is similar to :opcode:`END_FINALLY`, but doesn't change the bytecode counter nor raise an exception. Used for implementing :keyword:`break`, :keyword:`continue` and :keyword:`return` in the :keyword:`finally` block. .. versionadded:: 3.8
.. opcode:: BEGIN_FINALLY Pushes ``NULL`` onto the stack for using it in :opcode:`END_FINALLY`, :opcode:`POP_FINALLY`, :opcode:`WITH_CLEANUP_START` and :opcode:`WITH_CLEANUP_FINISH`. Starts the :keyword:`finally` block. .. versionadded:: 3.8
.. opcode:: END_FINALLY Terminates a :keyword:`finally` clause. The interpreter recalls whether the exception has to be re-raised or execution has to be continued depending on the value of TOS. * If TOS is ``NULL`` (pushed by :opcode:`BEGIN_FINALLY`) continue from the next instruction. TOS is popped. * If TOS is an integer (pushed by :opcode:`CALL_FINALLY`), sets the bytecode counter to TOS. TOS is popped. * If TOS is an exception type (pushed when an exception has been raised) 6 values are popped from the stack, the first three popped values are used to re-raise the exception and the last three popped values are used to restore the exception state. An exception handler block is removed from the block stack.
.. opcode:: LOAD_BUILD_CLASS Pushes :func:`builtins.__build_class__` onto the stack. It is later called by :opcode:`CALL_FUNCTION` to construct a class.
.. opcode:: SETUP_WITH (delta) This opcode performs several operations before a with block starts. First, it loads :meth:`~object.__exit__` from the context manager and pushes it onto the stack for later use by :opcode:`WITH_CLEANUP_START`. Then, :meth:`~object.__enter__` is called, and a finally block pointing to *delta* is pushed. Finally, the result of calling the ``__enter__()`` method is pushed onto the stack. The next opcode will either ignore it (:opcode:`POP_TOP`), or store it in (a) variable(s) (:opcode:`STORE_FAST`, :opcode:`STORE_NAME`, or :opcode:`UNPACK_SEQUENCE`). .. versionadded:: 3.2
.. opcode:: WITH_CLEANUP_START Starts cleaning up the stack when a :keyword:`with` statement block exits. At the top of the stack are either ``NULL`` (pushed by :opcode:`BEGIN_FINALLY`) or 6 values pushed if an exception has been raised in the with block. Below is the context manager's :meth:`~object.__exit__` or :meth:`~object.__aexit__` bound method. If TOS is ``NULL``, calls ``SECOND(None, None, None)``, removes the function from the stack, leaving TOS, and pushes ``None`` to the stack. Otherwise calls ``SEVENTH(TOP, SECOND, THIRD)``, shifts the bottom 3 values of the stack down, replaces the empty spot with ``NULL`` and pushes TOS. Finally pushes the result of the call.
.. opcode:: WITH_CLEANUP_FINISH Finishes cleaning up the stack when a :keyword:`with` statement block exits. TOS is result of ``__exit__()`` or ``__aexit__()`` function call pushed by :opcode:`WITH_CLEANUP_START`. SECOND is ``None`` or an exception type (pushed when an exception has been raised). Pops two values from the stack. If SECOND is not None and TOS is true unwinds the EXCEPT_HANDLER block which was created when the exception was caught and pushes ``NULL`` to the stack.
All of the following opcodes use their arguments.
.. opcode:: STORE_NAME (namei) Implements ``name = TOS``. *namei* is the index of *name* in the attribute :attr:`co_names` of the code object. The compiler tries to use :opcode:`STORE_FAST` or :opcode:`STORE_GLOBAL` if possible.
.. opcode:: DELETE_NAME (namei) Implements ``del name``, where *namei* is the index into :attr:`co_names` attribute of the code object.
.. opcode:: UNPACK_SEQUENCE (count) Unpacks TOS into *count* individual values, which are put onto the stack right-to-left.
.. opcode:: UNPACK_EX (counts) Implements assignment with a starred target: Unpacks an iterable in TOS into individual values, where the total number of values can be smaller than the number of items in the iterable: one of the new values will be a list of all leftover items. The low byte of *counts* is the number of values before the list value, the high byte of *counts* the number of values after it. The resulting values are put onto the stack right-to-left.
.. opcode:: STORE_ATTR (namei) Implements ``TOS.name = TOS1``, where *namei* is the index of name in :attr:`co_names`.
.. opcode:: DELETE_ATTR (namei) Implements ``del TOS.name``, using *namei* as index into :attr:`co_names`.
.. opcode:: STORE_GLOBAL (namei) Works as :opcode:`STORE_NAME`, but stores the name as a global.
.. opcode:: DELETE_GLOBAL (namei) Works as :opcode:`DELETE_NAME`, but deletes a global name.
.. opcode:: LOAD_CONST (consti) Pushes ``co_consts[consti]`` onto the stack.
.. opcode:: LOAD_NAME (namei) Pushes the value associated with ``co_names[namei]`` onto the stack.
.. opcode:: BUILD_TUPLE (count) Creates a tuple consuming *count* items from the stack, and pushes the resulting tuple onto the stack.
.. opcode:: BUILD_LIST (count) Works as :opcode:`BUILD_TUPLE`, but creates a list.
.. opcode:: BUILD_SET (count) Works as :opcode:`BUILD_TUPLE`, but creates a set.
.. opcode:: BUILD_MAP (count)
Pushes a new dictionary object onto the stack. Pops ``2 * count`` items
so that the dictionary holds *count* entries:
``{..., TOS3: TOS2, TOS1: TOS}``.
.. versionchanged:: 3.5
The dictionary is created from stack items instead of creating an
empty dictionary pre-sized to hold *count* items.
.. opcode:: BUILD_CONST_KEY_MAP (count) The version of :opcode:`BUILD_MAP` specialized for constant keys. *count* values are consumed from the stack. The top element on the stack contains a tuple of keys. .. versionadded:: 3.6
.. opcode:: BUILD_STRING (count) Concatenates *count* strings from the stack and pushes the resulting string onto the stack. .. versionadded:: 3.6
.. opcode:: BUILD_TUPLE_UNPACK (count) Pops *count* iterables from the stack, joins them in a single tuple, and pushes the result. Implements iterable unpacking in tuple displays ``(*x, *y, *z)``. .. versionadded:: 3.5
.. opcode:: BUILD_TUPLE_UNPACK_WITH_CALL (count) This is similar to :opcode:`BUILD_TUPLE_UNPACK`, but is used for ``f(*x, *y, *z)`` call syntax. The stack item at position ``count + 1`` should be the corresponding callable ``f``. .. versionadded:: 3.6
.. opcode:: BUILD_LIST_UNPACK (count) This is similar to :opcode:`BUILD_TUPLE_UNPACK`, but pushes a list instead of tuple. Implements iterable unpacking in list displays ``[*x, *y, *z]``. .. versionadded:: 3.5
.. opcode:: BUILD_SET_UNPACK (count)
This is similar to :opcode:`BUILD_TUPLE_UNPACK`, but pushes a set
instead of tuple. Implements iterable unpacking in set
displays ``{*x, *y, *z}``.
.. versionadded:: 3.5
.. opcode:: BUILD_MAP_UNPACK (count)
Pops *count* mappings from the stack, merges them into a single dictionary,
and pushes the result. Implements dictionary unpacking in dictionary
displays ``{**x, **y, **z}``.
.. versionadded:: 3.5
.. opcode:: BUILD_MAP_UNPACK_WITH_CALL (count) This is similar to :opcode:`BUILD_MAP_UNPACK`, but is used for ``f(**x, **y, **z)`` call syntax. The stack item at position ``count + 2`` should be the corresponding callable ``f``. .. versionadded:: 3.5 .. versionchanged:: 3.6 The position of the callable is determined by adding 2 to the opcode argument instead of encoding it in the second byte of the argument.
.. opcode:: LOAD_ATTR (namei) Replaces TOS with ``getattr(TOS, co_names[namei])``.
.. opcode:: COMPARE_OP (opname) Performs a Boolean operation. The operation name can be found in ``cmp_op[opname]``.
.. opcode:: IMPORT_NAME (namei) Imports the module ``co_names[namei]``. TOS and TOS1 are popped and provide the *fromlist* and *level* arguments of :func:`__import__`. The module object is pushed onto the stack. The current namespace is not affected: for a proper import statement, a subsequent :opcode:`STORE_FAST` instruction modifies the namespace.
.. opcode:: IMPORT_FROM (namei) Loads the attribute ``co_names[namei]`` from the module found in TOS. The resulting object is pushed onto the stack, to be subsequently stored by a :opcode:`STORE_FAST` instruction.
.. opcode:: JUMP_FORWARD (delta) Increments bytecode counter by *delta*.
.. opcode:: POP_JUMP_IF_TRUE (target) If TOS is true, sets the bytecode counter to *target*. TOS is popped. .. versionadded:: 3.1
.. opcode:: POP_JUMP_IF_FALSE (target) If TOS is false, sets the bytecode counter to *target*. TOS is popped. .. versionadded:: 3.1
.. opcode:: JUMP_IF_TRUE_OR_POP (target) If TOS is true, sets the bytecode counter to *target* and leaves TOS on the stack. Otherwise (TOS is false), TOS is popped. .. versionadded:: 3.1
.. opcode:: JUMP_IF_FALSE_OR_POP (target) If TOS is false, sets the bytecode counter to *target* and leaves TOS on the stack. Otherwise (TOS is true), TOS is popped. .. versionadded:: 3.1
.. opcode:: JUMP_ABSOLUTE (target) Set bytecode counter to *target*.
.. opcode:: FOR_ITER (delta) TOS is an :term:`iterator`. Call its :meth:`~iterator.__next__` method. If this yields a new value, push it on the stack (leaving the iterator below it). If the iterator indicates it is exhausted TOS is popped, and the byte code counter is incremented by *delta*.
.. opcode:: LOAD_GLOBAL (namei) Loads the global named ``co_names[namei]`` onto the stack.
.. opcode:: SETUP_FINALLY (delta) Pushes a try block from a try-finally or try-except clause onto the block stack. *delta* points to the finally block or the first except block.
.. opcode:: CALL_FINALLY (delta) Pushes the address of the next instruction onto the stack and increments bytecode counter by *delta*. Used for calling the finally block as a "subroutine". .. versionadded:: 3.8
.. opcode:: LOAD_FAST (var_num) Pushes a reference to the local ``co_varnames[var_num]`` onto the stack.
.. opcode:: STORE_FAST (var_num) Stores TOS into the local ``co_varnames[var_num]``.
.. opcode:: DELETE_FAST (var_num) Deletes local ``co_varnames[var_num]``.
.. opcode:: LOAD_CLOSURE (i) Pushes a reference to the cell contained in slot *i* of the cell and free variable storage. The name of the variable is ``co_cellvars[i]`` if *i* is less than the length of *co_cellvars*. Otherwise it is ``co_freevars[i - len(co_cellvars)]``.
.. opcode:: LOAD_DEREF (i) Loads the cell contained in slot *i* of the cell and free variable storage. Pushes a reference to the object the cell contains on the stack.
.. opcode:: LOAD_CLASSDEREF (i) Much like :opcode:`LOAD_DEREF` but first checks the locals dictionary before consulting the cell. This is used for loading free variables in class bodies. .. versionadded:: 3.4
.. opcode:: STORE_DEREF (i) Stores TOS into the cell contained in slot *i* of the cell and free variable storage.
.. opcode:: DELETE_DEREF (i) Empties the cell contained in slot *i* of the cell and free variable storage. Used by the :keyword:`del` statement. .. versionadded:: 3.2
.. opcode:: RAISE_VARARGS (argc) Raises an exception using one of the 3 forms of the ``raise`` statement, depending on the value of *argc*: * 0: ``raise`` (re-raise previous exception) * 1: ``raise TOS`` (raise exception instance or type at ``TOS``) * 2: ``raise TOS1 from TOS`` (raise exception instance or type at ``TOS1`` with ``__cause__`` set to ``TOS``)
.. opcode:: CALL_FUNCTION (argc) Calls a callable object with positional arguments. *argc* indicates the number of positional arguments. The top of the stack contains positional arguments, with the right-most argument on top. Below the arguments is a callable object to call. ``CALL_FUNCTION`` pops all arguments and the callable object off the stack, calls the callable object with those arguments, and pushes the return value returned by the callable object. .. versionchanged:: 3.6 This opcode is used only for calls with positional arguments.
.. opcode:: CALL_FUNCTION_KW (argc) Calls a callable object with positional (if any) and keyword arguments. *argc* indicates the total number of positional and keyword arguments. The top element on the stack contains a tuple of keyword argument names. Below that are keyword arguments in the order corresponding to the tuple. Below that are positional arguments, with the right-most parameter on top. Below the arguments is a callable object to call. ``CALL_FUNCTION_KW`` pops all arguments and the callable object off the stack, calls the callable object with those arguments, and pushes the return value returned by the callable object. .. versionchanged:: 3.6 Keyword arguments are packed in a tuple instead of a dictionary, *argc* indicates the total number of arguments.
.. opcode:: CALL_FUNCTION_EX (flags) Calls a callable object with variable set of positional and keyword arguments. If the lowest bit of *flags* is set, the top of the stack contains a mapping object containing additional keyword arguments. Below that is an iterable object containing positional arguments and a callable object to call. :opcode:`BUILD_MAP_UNPACK_WITH_CALL` and :opcode:`BUILD_TUPLE_UNPACK_WITH_CALL` can be used for merging multiple mapping objects and iterables containing arguments. Before the callable is called, the mapping object and iterable object are each "unpacked" and their contents passed in as keyword and positional arguments respectively. ``CALL_FUNCTION_EX`` pops all arguments and the callable object off the stack, calls the callable object with those arguments, and pushes the return value returned by the callable object. .. versionadded:: 3.6
.. opcode:: LOAD_METHOD (namei) Loads a method named ``co_names[namei]`` from TOS object. TOS is popped and method and TOS are pushed when interpreter can call unbound method directly. TOS will be used as the first argument (``self``) by :opcode:`CALL_METHOD`. Otherwise, ``NULL`` and method is pushed (method is bound method or something else). .. versionadded:: 3.7
.. opcode:: CALL_METHOD (argc) Calls a method. *argc* is number of positional arguments. Keyword arguments are not supported. This opcode is designed to be used with :opcode:`LOAD_METHOD`. Positional arguments are on top of the stack. Below them, two items described in :opcode:`LOAD_METHOD` on the stack. All of them are popped and return value is pushed. .. versionadded:: 3.7
.. opcode:: MAKE_FUNCTION (argc) Pushes a new function object on the stack. From bottom to top, the consumed stack must consist of values if the argument carries a specified flag value * ``0x01`` a tuple of default values for positional-only and positional-or-keyword parameters in positional order * ``0x02`` a dictionary of keyword-only parameters' default values * ``0x04`` an annotation dictionary * ``0x08`` a tuple containing cells for free variables, making a closure * the code associated with the function (at TOS1) * the :term:`qualified name` of the function (at TOS)
.. opcode:: BUILD_SLICE (argc) .. index:: builtin: slice Pushes a slice object on the stack. *argc* must be 2 or 3. If it is 2, ``slice(TOS1, TOS)`` is pushed; if it is 3, ``slice(TOS2, TOS1, TOS)`` is pushed. See the :func:`slice` built-in function for more information.
.. opcode:: EXTENDED_ARG (ext) Prefixes any opcode which has an argument too big to fit into the default one byte. *ext* holds an additional byte which act as higher bits in the argument. For each opcode, at most three prefixal ``EXTENDED_ARG`` are allowed, forming an argument from two-byte to four-byte.
.. opcode:: FORMAT_VALUE (flags) Used for implementing formatted literal strings (f-strings). Pops an optional *fmt_spec* from the stack, then a required *value*. *flags* is interpreted as follows: * ``(flags & 0x03) == 0x00``: *value* is formatted as-is. * ``(flags & 0x03) == 0x01``: call :func:`str` on *value* before formatting it. * ``(flags & 0x03) == 0x02``: call :func:`repr` on *value* before formatting it. * ``(flags & 0x03) == 0x03``: call :func:`ascii` on *value* before formatting it. * ``(flags & 0x04) == 0x04``: pop *fmt_spec* from the stack and use it, else use an empty *fmt_spec*. Formatting is performed using :c:func:`PyObject_Format`. The result is pushed on the stack. .. versionadded:: 3.6
.. opcode:: HAVE_ARGUMENT This is not really an opcode. It identifies the dividing line between opcodes which don't use their argument and those that do (``< HAVE_ARGUMENT`` and ``>= HAVE_ARGUMENT``, respectively). .. versionchanged:: 3.6 Now every instruction has an argument, but opcodes ``< HAVE_ARGUMENT`` ignore it. Before, only opcodes ``>= HAVE_ARGUMENT`` had an argument.
These collections are provided for automatic introspection of bytecode instructions:
.. data:: opname Sequence of operation names, indexable using the bytecode.
.. data:: opmap Dictionary mapping operation names to bytecodes.
.. data:: cmp_op Sequence of all compare operation names.
.. data:: hasconst Sequence of bytecodes that access a constant.
.. data:: hasfree Sequence of bytecodes that access a free variable (note that 'free' in this context refers to names in the current scope that are referenced by inner scopes or names in outer scopes that are referenced from this scope. It does *not* include references to global or builtin scopes).
.. data:: hasname Sequence of bytecodes that access an attribute by name.
.. data:: hasjrel Sequence of bytecodes that have a relative jump target.
.. data:: hasjabs Sequence of bytecodes that have an absolute jump target.
.. data:: haslocal Sequence of bytecodes that access a local variable.
.. data:: hascompare Sequence of bytecodes of Boolean operations.
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