diff options
Diffstat (limited to 'Doc/library')
| -rw-r--r-- | Doc/library/dis.rst | 59 |
1 files changed, 43 insertions, 16 deletions
diff --git a/Doc/library/dis.rst b/Doc/library/dis.rst index 1f773b7..7c92360 100644 --- a/Doc/library/dis.rst +++ b/Doc/library/dis.rst @@ -42,6 +42,14 @@ interpreter. bytecode to specialize it for different runtime conditions. The adaptive bytecode can be shown by passing ``adaptive=True``. + .. versionchanged:: 3.12 + The argument of a jump is the offset of the target instruction relative + to the instruction that appears immediately after the jump instruction's + :opcode:`CACHE` entries. + + As a consequence, the presence of the :opcode:`CACHE` instructions is + transparent for forward jumps but needs to be taken into account when + reasoning about backward jumps. Example: Given the function :func:`!myfunc`:: @@ -513,6 +521,14 @@ operations on it as if it was a Python list. The top of the stack corresponds to .. versionadded:: 3.12 +.. opcode:: END_SEND + + Implements ``del STACK[-2]``. + Used to clean up when a generator exits. + + .. versionadded:: 3.12 + + .. opcode:: COPY (i) Push the i-th item to the top of the stack without removing it from its original @@ -1159,15 +1175,21 @@ iterations of the loop. .. opcode:: LOAD_SUPER_ATTR (namei) - This opcode implements :func:`super` (e.g. ``super().method()`` and - ``super().attr``). It works the same as :opcode:`LOAD_ATTR`, except that - ``namei`` is shifted left by 2 bits instead of 1, and instead of expecting a - single receiver on the stack, it expects three objects (from top of stack - down): ``self`` (the first argument to the current method), ``cls`` (the - class within which the current method was defined), and the global ``super``. + This opcode implements :func:`super`, both in its zero-argument and + two-argument forms (e.g. ``super().method()``, ``super().attr`` and + ``super(cls, self).method()``, ``super(cls, self).attr``). + + It pops three values from the stack (from top of stack down): + - ``self``: the first argument to the current method + - ``cls``: the class within which the current method was defined + - the global ``super`` + + With respect to its argument, it works similarly to :opcode:`LOAD_ATTR`, + except that ``namei`` is shifted left by 2 bits instead of 1. The low bit of ``namei`` signals to attempt a method load, as with - :opcode:`LOAD_ATTR`. + :opcode:`LOAD_ATTR`, which results in pushing ``None`` and the loaded method. + When it is unset a single value is pushed to the stack. The second-low bit of ``namei``, if set, means that this was a two-argument call to :func:`super` (unset means zero-argument). @@ -1632,9 +1654,9 @@ iterations of the loop. Equivalent to ``STACK[-1] = STACK[-2].send(STACK[-1])``. Used in ``yield from`` and ``await`` statements. - If the call raises :exc:`StopIteration`, pop both items, push the - exception's ``value`` attribute, and increment the bytecode counter by - *delta*. + If the call raises :exc:`StopIteration`, pop the top value from the stack, + push the exception's ``value`` attribute, and increment the bytecode counter + by *delta*. .. versionadded:: 3.11 @@ -1664,7 +1686,7 @@ iterations of the loop. Calls an intrinsic function with one argument. Passes ``STACK[-1]`` as the argument and sets ``STACK[-1]`` to the result. Used to implement - functionality that is necessary but not performance critical. + functionality that is not performance critical. The operand determines which intrinsic function is called: @@ -1712,9 +1734,13 @@ iterations of the loop. .. opcode:: CALL_INTRINSIC_2 - Calls an intrinsic function with two arguments. Passes ``STACK[-2]``, ``STACK[-1]`` as the - arguments and sets ``STACK[-1]`` to the result. Used to implement functionality that is - necessary but not performance critical. + Calls an intrinsic function with two arguments. Used to implement functionality + that is not performance critical:: + + arg2 = STACK.pop() + arg1 = STACK.pop() + result = intrinsic2(arg1, arg2) + STACK.push(result) The operand determines which intrinsic function is called: @@ -1810,8 +1836,9 @@ These collections are provided for automatic introspection of bytecode instructions: .. versionchanged:: 3.12 - The collections now contain pseudo instructions as well. These are - opcodes with values ``>= MIN_PSEUDO_OPCODE``. + The collections now contain pseudo instructions and instrumented + instructions as well. These are opcodes with values ``>= MIN_PSEUDO_OPCODE`` + and ``>= MIN_INSTRUMENTED_OPCODE``. .. data:: opname |