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bpo-46409: Make generators in bytecode (GH-30633) 

* Add RETURN_GENERATOR and JUMP_NO_INTERRUPT opcodes.

* Trim frame and generator by word each.

* Minor refactor of frame.c

* Update test.test_sys to account for smaller frames.

* Treat generator functions as normal functions when evaluating and specializing.
This commit is contained in:
Mark Shannon 2022-01-20 11:46:39 +00:00 committed by GitHub
parent d05a66339b
commit b04dfbbe4b
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
18 changed files with 236 additions and 205 deletions
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15
Doc/library/dis.rst
View File

@ -942,6 +942,13 @@ All of the following opcodes use their arguments.
Set bytecode counter to *target*.
.. opcode:: JUMP_NO_INTERRUPT (target)
Set bytecode counter to *target*. Do not check for interrupts.
.. versionadded:: 3.11
.. opcode:: FOR_ITER (delta)
TOS is an :term:`iterator`. Call its :meth:`~iterator.__next__` method. If
@ -1220,6 +1227,14 @@ All of the following opcodes use their arguments.
.. versionadded:: 3.11
.. opcode:: RETURN_GENERATOR
Create a generator, coroutine, or async generator from the current frame.
Clear the current frame and return the newly created generator.
.. versionadded:: 3.11
.. opcode:: HAVE_ARGUMENT
This is not really an opcode. It identifies the dividing line between

1
Include/cpython/genobject.h
View File

@ -13,7 +13,6 @@ extern "C" {
and coroutine objects. */
#define _PyGenObject_HEAD(prefix) \
PyObject_HEAD \
/* Note: gi_frame can be NULL if the generator is "finished" */ \
/* The code object backing the generator */ \
PyCodeObject *prefix##_code; \
/* List of weak reference. */ \

4
Include/internal/pycore_frame.h
View File

@ -41,12 +41,12 @@ typedef struct _interpreter_frame {
PyObject *f_locals; /* Strong reference, may be NULL */
PyCodeObject *f_code; /* Strong reference */
PyFrameObject *frame_obj; /* Strong reference, may be NULL */
PyObject *generator; /* Borrowed reference, may be NULL */
struct _interpreter_frame *previous;
int f_lasti; /* Last instruction if called */
int stacktop; /* Offset of TOS from localsplus */
PyFrameState f_state; /* What state the frame is in */
bool is_entry; // Whether this is the "root" frame for the current CFrame.
bool is_generator;
PyObject *localsplus[1];
} InterpreterFrame;
@ -100,10 +100,10 @@ _PyFrame_InitializeSpecials(
frame->f_locals = Py_XNewRef(locals);
frame->stacktop = nlocalsplus;
frame->frame_obj = NULL;
frame->generator = NULL;
frame->f_lasti = -1;
frame->f_state = FRAME_CREATED;
frame->is_entry = false;
frame->is_generator = false;
}
/* Gets the pointer to the locals array

28
Include/opcode.h generated
View File

@ -38,6 +38,7 @@ extern "C" {
#define LOAD_BUILD_CLASS 71
#define GET_AWAITABLE 73
#define LOAD_ASSERTION_ERROR 74
#define RETURN_GENERATOR 75
#define LIST_TO_TUPLE 82
#define RETURN_VALUE 83
#define IMPORT_STAR 84
@ -89,6 +90,7 @@ extern "C" {
#define RAISE_VARARGS 130
#define MAKE_FUNCTION 132
#define BUILD_SLICE 133
#define JUMP_NO_INTERRUPT 134
#define MAKE_CELL 135
#define LOAD_CLOSURE 136
#define LOAD_DEREF 137
@ -157,18 +159,18 @@ extern "C" {
#define LOAD_GLOBAL_BUILTIN 66
#define LOAD_METHOD_ADAPTIVE 67
#define LOAD_METHOD_CACHED 72
#define LOAD_METHOD_CLASS 75
#define LOAD_METHOD_MODULE 76
#define LOAD_METHOD_NO_DICT 77
#define STORE_ATTR_ADAPTIVE 78
#define STORE_ATTR_INSTANCE_VALUE 79
#define STORE_ATTR_SLOT 80
#define STORE_ATTR_WITH_HINT 81
#define LOAD_FAST__LOAD_FAST 87
#define STORE_FAST__LOAD_FAST 131
#define LOAD_FAST__LOAD_CONST 134
#define LOAD_CONST__LOAD_FAST 140
#define STORE_FAST__STORE_FAST 141
#define LOAD_METHOD_CLASS 76
#define LOAD_METHOD_MODULE 77
#define LOAD_METHOD_NO_DICT 78
#define STORE_ATTR_ADAPTIVE 79
#define STORE_ATTR_INSTANCE_VALUE 80
#define STORE_ATTR_SLOT 81
#define STORE_ATTR_WITH_HINT 87
#define LOAD_FAST__LOAD_FAST 131
#define STORE_FAST__LOAD_FAST 140
#define LOAD_FAST__LOAD_CONST 141
#define LOAD_CONST__LOAD_FAST 143
#define STORE_FAST__STORE_FAST 150
#define DO_TRACING 255
#ifdef NEED_OPCODE_JUMP_TABLES
static uint32_t _PyOpcode_RelativeJump[8] = {
@ -186,7 +188,7 @@ static uint32_t _PyOpcode_Jump[8] = {
0U,
536870912U,
2316288000U,
3U,
67U,
0U,
0U,
0U,

3
Lib/importlib/_bootstrap_external.py
View File

@ -380,6 +380,7 @@ _code_type = type(_write_atomic.__code__)
# Python 3.11a4 3472 (bpo-46009: replace GEN_START with POP_TOP)
# Python 3.11a4 3473 (Add POP_JUMP_IF_NOT_NONE/POP_JUMP_IF_NONE opcodes)
# Python 3.11a4 3474 (Add RESUME opcode)
# Python 3.11a5 3475 (Add RETURN_GENERATOR opcode)
# Python 3.12 will start with magic number 3500
@ -393,7 +394,7 @@ _code_type = type(_write_atomic.__code__)
# Whenever MAGIC_NUMBER is changed, the ranges in the magic_values array
# in PC/launcher.c must also be updated.
MAGIC_NUMBER = (3474).to_bytes(2, 'little') + b'\r\n'
MAGIC_NUMBER = (3475).to_bytes(2, 'little') + b'\r\n'
_RAW_MAGIC_NUMBER = int.from_bytes(MAGIC_NUMBER, 'little') # For import.c
_PYCACHE = '__pycache__'

12
Lib/inspect.py
View File

@ -1819,11 +1819,11 @@ def getgeneratorstate(generator):
"""
if generator.gi_running:
return GEN_RUNNING
if generator.gi_suspended:
return GEN_SUSPENDED
if generator.gi_frame is None:
return GEN_CLOSED
if generator.gi_frame.f_lasti == -1:
return GEN_CREATED
return GEN_SUSPENDED
return GEN_CREATED
def getgeneratorlocals(generator):
@ -1861,11 +1861,11 @@ def getcoroutinestate(coroutine):
"""
if coroutine.cr_running:
return CORO_RUNNING
if coroutine.cr_suspended:
return CORO_SUSPENDED
if coroutine.cr_frame is None:
return CORO_CLOSED
if coroutine.cr_frame.f_lasti == -1:
return CORO_CREATED
return CORO_SUSPENDED
return CORO_CREATED
def getcoroutinelocals(coroutine):

3
Lib/opcode.py
View File

@ -94,6 +94,7 @@ def_op('LOAD_BUILD_CLASS', 71)
def_op('GET_AWAITABLE', 73)
def_op('LOAD_ASSERTION_ERROR', 74)
def_op('RETURN_GENERATOR', 75)
def_op('LIST_TO_TUPLE', 82)
def_op('RETURN_VALUE', 83)
@ -155,7 +156,7 @@ def_op('RAISE_VARARGS', 130) # Number of raise arguments (1, 2, or 3)
def_op('MAKE_FUNCTION', 132) # Flags
def_op('BUILD_SLICE', 133) # Number of items
jabs_op('JUMP_NO_INTERRUPT', 134) # Target byte offset from beginning of code
def_op('MAKE_CELL', 135)
hasfree.append(135)
def_op('LOAD_CLOSURE', 136)

4
Lib/test/test_compile.py
View File

@ -954,7 +954,7 @@ if 1:
x
in
y)
genexp_lines = [None, 1, 3, 1]
genexp_lines = [1, 3, 1]
genexp_code = return_genexp.__code__.co_consts[1]
code_lines = [ None if line is None else line-return_genexp.__code__.co_firstlineno
@ -967,7 +967,7 @@ if 1:
async for i in aseq:
body
expected_lines = [None, 0, 1, 2, 1]
expected_lines = [0, 1, 2, 1]
code_lines = [ None if line is None else line-test.__code__.co_firstlineno
for (_, _, line) in test.__code__.co_lines() ]
self.assertEqual(expected_lines, code_lines)

2
Lib/test/test_generators.py
View File

@ -897,7 +897,7 @@ From the Iterators list, about the types of these things.
>>> type(i)
<class 'generator'>
>>> [s for s in dir(i) if not s.startswith('_')]
['close', 'gi_code', 'gi_frame', 'gi_running', 'gi_yieldfrom', 'send', 'throw']
['close', 'gi_code', 'gi_frame', 'gi_running', 'gi_suspended', 'gi_yieldfrom', 'send', 'throw']
>>> from test.support import HAVE_DOCSTRINGS
>>> print(i.__next__.__doc__ if HAVE_DOCSTRINGS else 'Implement next(self).')
Implement next(self).

4
Lib/test/test_sys.py
View File

@ -1386,7 +1386,7 @@ class SizeofTest(unittest.TestCase):
def func():
return sys._getframe()
x = func()
check(x, size('3Pi3c8P2ic?P'))
check(x, size('3Pi3c7P2ic??P'))
# function
def func(): pass
check(func, size('14Pi'))
@ -1403,7 +1403,7 @@ class SizeofTest(unittest.TestCase):
check(bar, size('PP'))
# generator
def get_gen(): yield 1
check(get_gen(), size('P2P4P4c8P2ic?P'))
check(get_gen(), size('P2P4P4c7P2ic??P'))
# iterator
check(iter('abc'), size('lP'))
# callable-iterator

6
Misc/NEWS.d/next/Core and Builtins/2022-01-17-12-57-27.bpo-46409.HouS6m.rst Normal file
View File

@ -0,0 +1,6 @@
Add new ``RETURN_GENERATOR`` bytecode to make generators.
Simplifies calling Python functions in the VM, as they no
longer any need to special case generator functions.
Also add ``JUMP_NO_INTERRUPT`` bytecode that acts like
``JUMP_ABSOLUTE``, but does not check for interrupts.

10
Objects/frameobject.c
View File

@ -242,6 +242,7 @@ mark_stacks(PyCodeObject *code_obj, int len)
break;
}
case JUMP_ABSOLUTE:
case JUMP_NO_INTERRUPT:
j = get_arg(code, i);
assert(j < len);
if (stacks[j] == UNINITIALIZED && j < i) {
@ -625,7 +626,7 @@ frame_dealloc(PyFrameObject *f)
{
/* It is the responsibility of the owning generator/coroutine
* to have cleared the generator pointer */
assert(f->f_frame->generator == NULL);
assert(!f->f_frame->is_generator);
if (_PyObject_GC_IS_TRACKED(f)) {
_PyObject_GC_UNTRACK(f);
@ -698,8 +699,11 @@ frame_clear(PyFrameObject *f, PyObject *Py_UNUSED(ignored))
"cannot clear an executing frame");
return NULL;
}
if (f->f_frame->generator) {
_PyGen_Finalize(f->f_frame->generator);
if (f->f_frame->is_generator) {
assert(!f->f_owns_frame);
size_t offset_in_gen = offsetof(PyGenObject, gi_iframe);
PyObject *gen = (PyObject *)(((char *)f->f_frame) - offset_in_gen);
_PyGen_Finalize(gen);
}
(void)frame_tp_clear(f);
Py_RETURN_NONE;

57
Objects/genobject.c
View File

@ -87,7 +87,7 @@ _PyGen_Finalize(PyObject *self)
issue a RuntimeWarning. */
if (gen->gi_code != NULL &&
((PyCodeObject *)gen->gi_code)->co_flags & CO_COROUTINE &&
((InterpreterFrame *)gen->gi_iframe)->f_lasti == -1)
((InterpreterFrame *)gen->gi_iframe)->f_state == FRAME_CREATED)
{
_PyErr_WarnUnawaitedCoroutine((PyObject *)gen);
}
@ -133,7 +133,7 @@ gen_dealloc(PyGenObject *gen)
if (gen->gi_frame_valid) {
InterpreterFrame *frame = (InterpreterFrame *)gen->gi_iframe;
gen->gi_frame_valid = 0;
frame->generator = NULL;
frame->is_generator = false;
frame->previous = NULL;
_PyFrame_Clear(frame);
}
@ -156,7 +156,7 @@ gen_send_ex2(PyGenObject *gen, PyObject *arg, PyObject **presult,
PyObject *result;
*presult = NULL;
if (frame->f_lasti < 0 && arg && arg != Py_None) {
if (frame->f_state == FRAME_CREATED && arg && arg != Py_None) {
const char *msg = "can't send non-None value to a "
"just-started generator";
if (PyCoro_CheckExact(gen)) {
@ -265,7 +265,7 @@ gen_send_ex2(PyGenObject *gen, PyObject *arg, PyObject **presult,
/* first clean reference cycle through stored exception traceback */
_PyErr_ClearExcState(&gen->gi_exc_state);
frame->generator = NULL;
frame->is_generator = false;
gen->gi_frame_valid = 0;
_PyFrame_Clear(frame);
*presult = result;
@ -753,6 +753,15 @@ gen_getrunning(PyGenObject *gen, void *Py_UNUSED(ignored))
return PyBool_FromLong(_PyFrame_IsExecuting((InterpreterFrame *)gen->gi_iframe));
}
static PyObject *
gen_getsuspended(PyGenObject *gen, void *Py_UNUSED(ignored))
{
if (gen->gi_frame_valid == 0) {
Py_RETURN_FALSE;
}
return PyBool_FromLong(((InterpreterFrame *)gen->gi_iframe)->f_state == FRAME_SUSPENDED);
}
static PyObject *
_gen_getframe(PyGenObject *gen, const char *const name)
{
@ -780,6 +789,7 @@ static PyGetSetDef gen_getsetlist[] = {
PyDoc_STR("object being iterated by yield from, or None")},
{"gi_running", (getter)gen_getrunning, NULL, NULL},
{"gi_frame", (getter)gen_getframe, NULL, NULL},
{"gi_suspended", (getter)gen_getsuspended, NULL, NULL},
{NULL} /* Sentinel */
};
@ -886,22 +896,16 @@ make_gen(PyTypeObject *type, PyFunctionObject *func)
gen->gi_weakreflist = NULL;
gen->gi_exc_state.exc_value = NULL;
gen->gi_exc_state.previous_item = NULL;
if (func->func_name != NULL)
gen->gi_name = func->func_name;
else
gen->gi_name = gen->gi_code->co_name;
Py_INCREF(gen->gi_name);
if (func->func_qualname != NULL)
gen->gi_qualname = func->func_qualname;
else
gen->gi_qualname = gen->gi_name;
Py_INCREF(gen->gi_qualname);
assert(func->func_name != NULL);
gen->gi_name = Py_NewRef(func->func_name);
assert(func->func_qualname != NULL);
gen->gi_qualname = Py_NewRef(func->func_qualname);
_PyObject_GC_TRACK(gen);
return (PyObject *)gen;
}
static PyObject *
compute_cr_origin(int origin_depth);
compute_cr_origin(int origin_depth, InterpreterFrame *current_frame);
PyObject *
_Py_MakeCoro(PyFunctionObject *func)
@ -935,7 +939,8 @@ _Py_MakeCoro(PyFunctionObject *func)
if (origin_depth == 0) {
((PyCoroObject *)coro)->cr_origin_or_finalizer = NULL;
} else {
PyObject *cr_origin = compute_cr_origin(origin_depth);
assert(_PyEval_GetFrame());
PyObject *cr_origin = compute_cr_origin(origin_depth, _PyEval_GetFrame()->previous);
((PyCoroObject *)coro)->cr_origin_or_finalizer = cr_origin;
if (!cr_origin) {
Py_DECREF(coro);
@ -965,7 +970,7 @@ gen_new_with_qualname(PyTypeObject *type, PyFrameObject *f,
assert(frame->frame_obj == f);
f->f_owns_frame = 0;
f->f_frame = frame;
frame->generator = (PyObject *) gen;
frame->is_generator = true;
assert(PyObject_GC_IsTracked((PyObject *)f));
gen->gi_code = PyFrame_GetCode(f);
Py_INCREF(gen->gi_code);
@ -1097,6 +1102,15 @@ coro_get_cr_await(PyCoroObject *coro, void *Py_UNUSED(ignored))
return yf;
}
static PyObject *
cr_getsuspended(PyCoroObject *coro, void *Py_UNUSED(ignored))
{
if (coro->cr_frame_valid == 0) {
Py_RETURN_FALSE;
}
return PyBool_FromLong(((InterpreterFrame *)coro->cr_iframe)->f_state == FRAME_SUSPENDED);
}
static PyObject *
cr_getrunning(PyCoroObject *coro, void *Py_UNUSED(ignored))
{
@ -1122,6 +1136,7 @@ static PyGetSetDef coro_getsetlist[] = {
PyDoc_STR("object being awaited on, or None")},
{"cr_running", (getter)cr_getrunning, NULL, NULL},
{"cr_frame", (getter)cr_getframe, NULL, NULL},
{"cr_suspended", (getter)cr_getsuspended, NULL, NULL},
{NULL} /* Sentinel */
};
@ -1299,9 +1314,9 @@ PyTypeObject _PyCoroWrapper_Type = {
};
static PyObject *
compute_cr_origin(int origin_depth)
compute_cr_origin(int origin_depth, InterpreterFrame *current_frame)
{
InterpreterFrame *frame = _PyEval_GetFrame();
InterpreterFrame *frame = current_frame;
/* First count how many frames we have */
int frame_count = 0;
for (; frame && frame_count < origin_depth; ++frame_count) {
@ -1313,7 +1328,7 @@ compute_cr_origin(int origin_depth)
if (cr_origin == NULL) {
return NULL;
}
frame = _PyEval_GetFrame();
frame = current_frame;
for (int i = 0; i < frame_count; ++i) {
PyCodeObject *code = frame->f_code;
PyObject *frameinfo = Py_BuildValue("OiO",
@ -1345,7 +1360,7 @@ PyCoro_New(PyFrameObject *f, PyObject *name, PyObject *qualname)
if (origin_depth == 0) {
((PyCoroObject *)coro)->cr_origin_or_finalizer = NULL;
} else {
PyObject *cr_origin = compute_cr_origin(origin_depth);
PyObject *cr_origin = compute_cr_origin(origin_depth, _PyEval_GetFrame());
((PyCoroObject *)coro)->cr_origin_or_finalizer = cr_origin;
if (!cr_origin) {
Py_DECREF(coro);

197
Python/ceval.c
View File

@ -1345,7 +1345,7 @@ eval_frame_handle_pending(PyThreadState *tstate)
#define CHECK_EVAL_BREAKER() \
if (_Py_atomic_load_relaxed(eval_breaker)) { \
goto check_eval_breaker; \
goto handle_eval_breaker; \
}
@ -1620,12 +1620,6 @@ trace_function_exit(PyThreadState *tstate, InterpreterFrame *frame, PyObject *re
return 0;
}
static PyObject *
make_coro(PyThreadState *tstate, PyFunctionObject *func,
PyObject *locals,
PyObject* const* args, size_t argcount,
PyObject *kwnames);
static int
skip_backwards_over_extended_args(PyCodeObject *code, int offset)
{
@ -1760,49 +1754,21 @@ resume_frame:
assert(!_PyErr_Occurred(tstate));
#endif
check_eval_breaker:
{
assert(STACK_LEVEL() >= 0); /* else underflow */
assert(STACK_LEVEL() <= frame->f_code->co_stacksize); /* else overflow */
assert(!_PyErr_Occurred(tstate));
/* Do periodic things. Doing this every time through
the loop would add too much overhead, so we do it
only every Nth instruction. We also do it if
``pending.calls_to_do'' is set, i.e. when an asynchronous
event needs attention (e.g. a signal handler or
async I/O handler); see Py_AddPendingCall() and
Py_MakePendingCalls() above. */
if (_Py_atomic_load_relaxed(eval_breaker)) {
opcode = _Py_OPCODE(*next_instr);
if (opcode != BEFORE_ASYNC_WITH &&
opcode != SEND &&
_Py_OPCODE(next_instr[-1]) != SEND) {
/* Few cases where we skip running signal handlers and other
pending calls:
- If we're about to enter the 'with:'. It will prevent
emitting a resource warning in the common idiom
'with open(path) as file:'.
- If we're about to enter the 'async with:'.
- If we're about to enter the 'try:' of a try/finally (not
*very* useful, but might help in some cases and it's
traditional)
- If we're resuming a chain of nested 'yield from' or
'await' calls, then each frame is parked with YIELD_FROM
as its next opcode. If the user hit control-C we want to
wait until we've reached the innermost frame before
running the signal handler and raising KeyboardInterrupt
(see bpo-30039).
*/
if (eval_frame_handle_pending(tstate) != 0) {
goto error;
}
}
}
DISPATCH();
handle_eval_breaker:
/* Do periodic things, like check for signals and async I/0.
* We need to do reasonably frequently, but not too frequently.
* All loops should include a check of the eval breaker.
* We also check on return from any builtin function.
*/
if (eval_frame_handle_pending(tstate) != 0) {
goto error;
}
DISPATCH();
{
/* Start instructions */
#if USE_COMPUTED_GOTOS
{
@ -1834,6 +1800,9 @@ check_eval_breaker:
next_instr = first_instr + nexti;
}
frame->f_state = FRAME_EXECUTING;
if (_Py_atomic_load_relaxed(eval_breaker) && oparg < 2) {
goto handle_eval_breaker;
}
DISPATCH();
}
@ -4152,6 +4121,17 @@ check_eval_breaker:
DISPATCH();
}
TARGET(JUMP_NO_INTERRUPT) {
/* This bytecode is used in the `yield from` or `await` loop.
* If there is an interrupt, we want it handled in the innermost
* generator or coroutine, so we deliberately do not check it here.
* (see bpo-30039).
*/
frame->f_state = FRAME_EXECUTING;
JUMPTO(oparg);
DISPATCH();
}
TARGET(JUMP_ABSOLUTE_QUICK) {
assert(oparg < INSTR_OFFSET());
JUMPTO(oparg);
@ -4627,28 +4607,25 @@ check_eval_breaker:
// Check if the call can be inlined or not
if (Py_TYPE(function) == &PyFunction_Type && tstate->interp->eval_frame == NULL) {
int code_flags = ((PyCodeObject*)PyFunction_GET_CODE(function))->co_flags;
int is_generator = code_flags & (CO_GENERATOR | CO_COROUTINE | CO_ASYNC_GENERATOR);
if (!is_generator) {
PyObject *locals = code_flags & CO_OPTIMIZED ? NULL : PyFunction_GET_GLOBALS(function);
STACK_SHRINK(oparg);
InterpreterFrame *new_frame = _PyEvalFramePushAndInit(
tstate, (PyFunctionObject *)function, locals,
stack_pointer, nargs, kwnames
);
STACK_SHRINK(postcall_shrink);
RESET_STACK_ADJUST_FOR_CALLS;
// The frame has stolen all the arguments from the stack,
// so there is no need to clean them up.
Py_XDECREF(kwnames);
Py_DECREF(function);
if (new_frame == NULL) {
goto error;
}
_PyFrame_SetStackPointer(frame, stack_pointer);
new_frame->previous = frame;
cframe.current_frame = frame = new_frame;
goto start_frame;
PyObject *locals = code_flags & CO_OPTIMIZED ? NULL : PyFunction_GET_GLOBALS(function);
STACK_SHRINK(oparg);
InterpreterFrame *new_frame = _PyEvalFramePushAndInit(
tstate, (PyFunctionObject *)function, locals,
stack_pointer, nargs, kwnames
);
STACK_SHRINK(postcall_shrink);
RESET_STACK_ADJUST_FOR_CALLS;
// The frame has stolen all the arguments from the stack,
// so there is no need to clean them up.
Py_XDECREF(kwnames);
Py_DECREF(function);
if (new_frame == NULL) {
goto error;
}
_PyFrame_SetStackPointer(frame, stack_pointer);
new_frame->previous = frame;
cframe.current_frame = frame = new_frame;
goto start_frame;
}
/* Callable is not a normal Python function */
PyObject *res;
@ -5076,6 +5053,40 @@ check_eval_breaker:
DISPATCH();
}
TARGET(RETURN_GENERATOR) {
PyGenObject *gen = (PyGenObject *)_Py_MakeCoro(frame->f_func);
if (gen == NULL) {
goto error;
}
assert(EMPTY());
_PyFrame_SetStackPointer(frame, stack_pointer);
InterpreterFrame *gen_frame = (InterpreterFrame *)gen->gi_iframe;
_PyFrame_Copy(frame, gen_frame);
assert(frame->frame_obj == NULL);
gen->gi_frame_valid = 1;
gen_frame->is_generator = true;
gen_frame->f_state = FRAME_CREATED;
_Py_LeaveRecursiveCall(tstate);
if (!frame->is_entry) {
InterpreterFrame *prev = frame->previous;
_PyThreadState_PopFrame(tstate, frame);
frame = cframe.current_frame = prev;
_PyFrame_StackPush(frame, (PyObject *)gen);
goto resume_frame;
}
/* Make sure that frame is in a valid state */
frame->stacktop = 0;
frame->f_locals = NULL;
Py_INCREF(frame->f_func);
Py_INCREF(frame->f_code);
/* Restore previous cframe and return. */
tstate->cframe = cframe.previous;
tstate->cframe->use_tracing = cframe.use_tracing;
assert(tstate->cframe->current_frame == frame->previous);
assert(!_PyErr_Occurred(tstate));
return (PyObject *)gen;
}
TARGET(BUILD_SLICE) {
PyObject *start, *stop, *step, *slice;
if (oparg == 3)
@ -5222,11 +5233,14 @@ check_eval_breaker:
frame->f_lasti = INSTR_OFFSET();
TRACING_NEXTOPARG();
if (opcode == RESUME) {
if (oparg < 2) {
CHECK_EVAL_BREAKER();
}
/* Call tracing */
TRACE_FUNCTION_ENTRY();
DTRACE_FUNCTION_ENTRY();
}
else {
else if (frame->f_state > FRAME_CREATED) {
/* line-by-line tracing support */
if (PyDTrace_LINE_ENABLED()) {
maybe_dtrace_line(frame, &tstate->trace_info, instr_prev);
@ -5961,33 +5975,6 @@ fail_post_args:
return -1;
}
/* Consumes all the references to the args */
static PyObject *
make_coro(PyThreadState *tstate, PyFunctionObject *func,
PyObject *locals,
PyObject* const* args, size_t argcount,
PyObject *kwnames)
{
assert (((PyCodeObject *)func->func_code)->co_flags & (CO_GENERATOR | CO_COROUTINE | CO_ASYNC_GENERATOR));
PyObject *gen = _Py_MakeCoro(func);
if (gen == NULL) {
return NULL;
}
InterpreterFrame *frame = (InterpreterFrame *)((PyGenObject *)gen)->gi_iframe;
PyCodeObject *code = (PyCodeObject *)func->func_code;
_PyFrame_InitializeSpecials(frame, func, locals, code->co_nlocalsplus);
for (int i = 0; i < code->co_nlocalsplus; i++) {
frame->localsplus[i] = NULL;
}
((PyGenObject *)gen)->gi_frame_valid = 1;
if (initialize_locals(tstate, func, frame->localsplus, args, argcount, kwnames)) {
Py_DECREF(gen);
return NULL;
}
frame->generator = gen;
return gen;
}
/* Consumes all the references to the args */
static InterpreterFrame *
_PyEvalFramePushAndInit(PyThreadState *tstate, PyFunctionObject *func,
@ -6041,10 +6028,7 @@ _PyEval_Vector(PyThreadState *tstate, PyFunctionObject *func,
PyObject* const* args, size_t argcount,
PyObject *kwnames)
{
PyCodeObject *code = (PyCodeObject *)func->func_code;
/* _PyEvalFramePushAndInit and make_coro consume
* all the references to their arguments
*/
/* _PyEvalFramePushAndInit consumes all the references to its arguments */
for (size_t i = 0; i < argcount; i++) {
Py_INCREF(args[i]);
}
@ -6054,19 +6038,16 @@ _PyEval_Vector(PyThreadState *tstate, PyFunctionObject *func,
Py_INCREF(args[i+argcount]);
}
}
int is_coro = code->co_flags &
(CO_GENERATOR | CO_COROUTINE | CO_ASYNC_GENERATOR);
if (is_coro) {
return make_coro(tstate, func, locals, args, argcount, kwnames);
}
InterpreterFrame *frame = _PyEvalFramePushAndInit(
tstate, func, locals, args, argcount, kwnames);
if (frame == NULL) {
return NULL;
}
PyObject *retval = _PyEval_EvalFrame(tstate, frame, 0);
assert(frame->stacktop >= 0);
assert(_PyFrame_GetStackPointer(frame) == _PyFrame_Stackbase(frame));
assert(
_PyFrame_GetStackPointer(frame) == _PyFrame_Stackbase(frame) ||
_PyFrame_GetStackPointer(frame) == frame->localsplus
);
_PyEvalFrameClearAndPop(tstate, frame);
return retval;
}

56
Python/compile.c
View File

@ -969,6 +969,7 @@ stack_effect(int opcode, int oparg, int jump)
/* Jumps */
case JUMP_FORWARD:
case JUMP_ABSOLUTE:
case JUMP_NO_INTERRUPT:
return 0;
case JUMP_IF_TRUE_OR_POP:
@ -1017,6 +1018,9 @@ stack_effect(int opcode, int oparg, int jump)
case DELETE_FAST:
return 0;
case RETURN_GENERATOR:
return 0;
case RAISE_VARARGS:
return -oparg;
@ -1841,7 +1845,7 @@ compiler_add_yield_from(struct compiler *c, int await)
ADDOP_JUMP(c, SEND, exit);
compiler_use_next_block(c, resume);
ADDOP_I(c, RESUME, await ? 3 : 2);
ADDOP_JUMP(c, JUMP_ABSOLUTE, start);
ADDOP_JUMP(c, JUMP_NO_INTERRUPT, start);
compiler_use_next_block(c, exit);
return 1;
}
@ -7055,6 +7059,7 @@ stackdepth(struct compiler *c)
}
depth = new_depth;
if (instr->i_opcode == JUMP_ABSOLUTE ||
instr->i_opcode == JUMP_NO_INTERRUPT ||
instr->i_opcode == JUMP_FORWARD ||
instr->i_opcode == RETURN_VALUE ||
instr->i_opcode == RAISE_VARARGS ||
@ -7572,9 +7577,6 @@ normalize_jumps(struct assembler *a)
if (last->i_target->b_visited == 0) {
last->i_opcode = JUMP_FORWARD;
}
else if (b->b_iused >= 2 && b->b_instr[b->b_iused-2].i_opcode == SEND) {
last->i_opcode = JUMP_ABSOLUTE_QUICK;
}
}
}
}
@ -7998,6 +8000,34 @@ insert_prefix_instructions(struct compiler *c, basicblock *entryblock,
}
assert(c->u->u_firstlineno > 0);
/* Add the generator prefix instructions. */
if (flags & (CO_GENERATOR | CO_COROUTINE | CO_ASYNC_GENERATOR)) {
struct instr make_gen = {
.i_opcode = RETURN_GENERATOR,
.i_oparg = 0,
.i_lineno = c->u->u_firstlineno,
.i_col_offset = -1,
.i_end_lineno = c->u->u_firstlineno,
.i_end_col_offset = -1,
.i_target = NULL,
};
if (insert_instruction(entryblock, 0, &make_gen) < 0) {
return -1;
}
struct instr pop_top = {
.i_opcode = POP_TOP,
.i_oparg = 0,
.i_lineno = -1,
.i_col_offset = -1,
.i_end_lineno = -1,
.i_end_col_offset = -1,
.i_target = NULL,
};
if (insert_instruction(entryblock, 1, &pop_top) < 0) {
return -1;
}
}
/* Set up cells for any variable that escapes, to be put in a closure. */
const int ncellvars = (int)PyDict_GET_SIZE(c->u->u_cellvars);
if (ncellvars) {
@ -8036,22 +8066,6 @@ insert_prefix_instructions(struct compiler *c, basicblock *entryblock,
PyMem_RawFree(sorted);
}
/* Add the generator prefix instructions. */
if (flags & (CO_GENERATOR | CO_COROUTINE | CO_ASYNC_GENERATOR)) {
struct instr pop_top = {
.i_opcode = POP_TOP,
.i_oparg = 0,
.i_lineno = -1,
.i_col_offset = -1,
.i_end_lineno = -1,
.i_end_col_offset = -1,
.i_target = NULL,
};
if (insert_instruction(entryblock, 0, &pop_top) < 0) {
return -1;
}
}
if (nfreevars) {
struct instr copy_frees = {
.i_opcode = COPY_FREE_VARS,
@ -8801,6 +8815,7 @@ normalize_basic_block(basicblock *bb) {
break;
case JUMP_ABSOLUTE:
case JUMP_FORWARD:
case JUMP_NO_INTERRUPT:
bb->b_nofallthrough = 1;
/* fall through */
case POP_JUMP_IF_NOT_NONE:
@ -8985,6 +9000,7 @@ optimize_cfg(struct compiler *c, struct assembler *a, PyObject *consts)
if (b->b_iused > 0) {
struct instr *b_last_instr = &b->b_instr[b->b_iused - 1];
if (b_last_instr->i_opcode == JUMP_ABSOLUTE ||
b_last_instr->i_opcode == JUMP_NO_INTERRUPT ||
b_last_instr->i_opcode == JUMP_FORWARD) {
if (b_last_instr->i_target == b->b_next) {
assert(b->b_next->b_iused);

19
Python/frame.c
View File

@ -3,6 +3,7 @@
#include "frameobject.h"
#include "pycore_frame.h"
#include "pycore_object.h" // _PyObject_GC_UNTRACK()
#include "opcode.h"
int
_PyFrame_Traverse(InterpreterFrame *frame, visitproc visit, void *arg)
@ -51,15 +52,6 @@ _PyFrame_Copy(InterpreterFrame *src, InterpreterFrame *dest)
memcpy(dest, src, size);
}
static inline void
clear_specials(InterpreterFrame *frame)
{
frame->generator = NULL;
Py_XDECREF(frame->frame_obj);
Py_XDECREF(frame->f_locals);
Py_DECREF(frame->f_func);
Py_DECREF(frame->f_code);
}
static void
take_ownership(PyFrameObject *f, InterpreterFrame *frame)
@ -94,8 +86,8 @@ void
_PyFrame_Clear(InterpreterFrame * frame)
{
/* It is the responsibility of the owning generator/coroutine
* to have cleared the generator pointer */
assert(frame->generator == NULL);
* to have cleared the enclosing generator, if any. */
assert(!frame->is_generator);
if (frame->frame_obj) {
PyFrameObject *f = frame->frame_obj;
frame->frame_obj = NULL;
@ -110,5 +102,8 @@ _PyFrame_Clear(InterpreterFrame * frame)
for (int i = 0; i < frame->stacktop; i++) {
Py_XDECREF(frame->localsplus[i]);
}
clear_specials(frame);
Py_XDECREF(frame->frame_obj);
Py_XDECREF(frame->f_locals);
Py_DECREF(frame->f_func);
Py_DECREF(frame->f_code);
}

16
Python/opcode_targets.h generated
View File

@ -74,19 +74,19 @@ static void *opcode_targets[256] = {
&&TARGET_LOAD_METHOD_CACHED,
&&TARGET_GET_AWAITABLE,
&&TARGET_LOAD_ASSERTION_ERROR,
&&TARGET_RETURN_GENERATOR,
&&TARGET_LOAD_METHOD_CLASS,
&&TARGET_LOAD_METHOD_MODULE,
&&TARGET_LOAD_METHOD_NO_DICT,
&&TARGET_STORE_ATTR_ADAPTIVE,
&&TARGET_STORE_ATTR_INSTANCE_VALUE,
&&TARGET_STORE_ATTR_SLOT,
&&TARGET_STORE_ATTR_WITH_HINT,
&&TARGET_LIST_TO_TUPLE,
&&TARGET_RETURN_VALUE,
&&TARGET_IMPORT_STAR,
&&TARGET_SETUP_ANNOTATIONS,
&&TARGET_YIELD_VALUE,
&&TARGET_LOAD_FAST__LOAD_FAST,
&&TARGET_STORE_ATTR_WITH_HINT,
&&TARGET_PREP_RERAISE_STAR,
&&TARGET_POP_EXCEPT,
&&TARGET_STORE_NAME,
@ -130,26 +130,26 @@ static void *opcode_targets[256] = {
&&TARGET_POP_JUMP_IF_NOT_NONE,
&&TARGET_POP_JUMP_IF_NONE,
&&TARGET_RAISE_VARARGS,
&&TARGET_STORE_FAST__LOAD_FAST,
&&TARGET_LOAD_FAST__LOAD_FAST,
&&TARGET_MAKE_FUNCTION,
&&TARGET_BUILD_SLICE,
&&TARGET_LOAD_FAST__LOAD_CONST,
&&TARGET_JUMP_NO_INTERRUPT,
&&TARGET_MAKE_CELL,
&&TARGET_LOAD_CLOSURE,
&&TARGET_LOAD_DEREF,
&&TARGET_STORE_DEREF,
&&TARGET_DELETE_DEREF,
&&TARGET_LOAD_CONST__LOAD_FAST,
&&TARGET_STORE_FAST__STORE_FAST,
&&TARGET_STORE_FAST__LOAD_FAST,
&&TARGET_LOAD_FAST__LOAD_CONST,
&&TARGET_CALL_FUNCTION_EX,
&&_unknown_opcode,
&&TARGET_LOAD_CONST__LOAD_FAST,
&&TARGET_EXTENDED_ARG,
&&TARGET_LIST_APPEND,
&&TARGET_SET_ADD,
&&TARGET_MAP_ADD,
&&TARGET_LOAD_CLASSDEREF,
&&TARGET_COPY_FREE_VARS,
&&_unknown_opcode,
&&TARGET_STORE_FAST__STORE_FAST,
&&TARGET_RESUME,
&&TARGET_MATCH_CLASS,
&&_unknown_opcode,

4
Python/specialize.c
View File

@ -499,7 +499,6 @@ initial_counter_value(void) {
#define SPEC_FAIL_DIFFERENT_TYPES 12
/* Calls */
#define SPEC_FAIL_GENERATOR 7
#define SPEC_FAIL_COMPLEX_PARAMETERS 8
#define SPEC_FAIL_WRONG_NUMBER_ARGUMENTS 9
#define SPEC_FAIL_CO_NOT_OPTIMIZED 10
@ -1153,9 +1152,6 @@ _Py_IDENTIFIER(__getitem__);
static int
function_kind(PyCodeObject *code) {
int flags = code->co_flags;
if (flags & (CO_GENERATOR | CO_COROUTINE | CO_ASYNC_GENERATOR)) {
return SPEC_FAIL_GENERATOR;
}
if ((flags & (CO_VARKEYWORDS | CO_VARARGS)) || code->co_kwonlyargcount) {
return SPEC_FAIL_COMPLEX_PARAMETERS;
}