Staging
v0.5.0
v0.5.0
https://github.com/python/cpython
Tip revision: e3201094af2af2a9958333bd1cb212253941d644 authored by Łukasz Langa on 07 December 2020, 14:13:36 UTC
Python 3.8.7rc1
Python 3.8.7rc1
Tip revision: e320109
ceval.c
/* Execute compiled code */
/* XXX TO DO:
XXX speed up searching for keywords by using a dictionary
XXX document it!
*/
/* enable more aggressive intra-module optimizations, where available */
#define PY_LOCAL_AGGRESSIVE
#include "Python.h"
#include "pycore_ceval.h"
#include "pycore_code.h"
#include "pycore_object.h"
#include "pycore_pyerrors.h"
#include "pycore_pylifecycle.h"
#include "pycore_pystate.h"
#include "pycore_tupleobject.h"
#include "code.h"
#include "dictobject.h"
#include "frameobject.h"
#include "opcode.h"
#include "pydtrace.h"
#include "setobject.h"
#include "structmember.h"
#include <ctype.h>
#ifdef Py_DEBUG
/* For debugging the interpreter: */
#define LLTRACE 1 /* Low-level trace feature */
#define CHECKEXC 1 /* Double-check exception checking */
#endif
#if !defined(Py_BUILD_CORE)
# error "ceval.c must be build with Py_BUILD_CORE define for best performance"
#endif
/* Private API for the LOAD_METHOD opcode. */
extern int _PyObject_GetMethod(PyObject *, PyObject *, PyObject **);
typedef PyObject *(*callproc)(PyObject *, PyObject *, PyObject *);
/* Forward declarations */
Py_LOCAL_INLINE(PyObject *) call_function(
PyThreadState *tstate, PyObject ***pp_stack,
Py_ssize_t oparg, PyObject *kwnames);
static PyObject * do_call_core(
PyThreadState *tstate, PyObject *func,
PyObject *callargs, PyObject *kwdict);
#ifdef LLTRACE
static int lltrace;
static int prtrace(PyThreadState *, PyObject *, const char *);
#endif
static int call_trace(Py_tracefunc, PyObject *,
PyThreadState *, PyFrameObject *,
int, PyObject *);
static int call_trace_protected(Py_tracefunc, PyObject *,
PyThreadState *, PyFrameObject *,
int, PyObject *);
static void call_exc_trace(Py_tracefunc, PyObject *,
PyThreadState *, PyFrameObject *);
static int maybe_call_line_trace(Py_tracefunc, PyObject *,
PyThreadState *, PyFrameObject *,
int *, int *, int *);
static void maybe_dtrace_line(PyFrameObject *, int *, int *, int *);
static void dtrace_function_entry(PyFrameObject *);
static void dtrace_function_return(PyFrameObject *);
static PyObject * cmp_outcome(PyThreadState *, int, PyObject *, PyObject *);
static PyObject * import_name(PyThreadState *, PyFrameObject *,
PyObject *, PyObject *, PyObject *);
static PyObject * import_from(PyThreadState *, PyObject *, PyObject *);
static int import_all_from(PyThreadState *, PyObject *, PyObject *);
static void format_exc_check_arg(PyThreadState *, PyObject *, const char *, PyObject *);
static void format_exc_unbound(PyThreadState *tstate, PyCodeObject *co, int oparg);
static PyObject * unicode_concatenate(PyThreadState *, PyObject *, PyObject *,
PyFrameObject *, const _Py_CODEUNIT *);
static PyObject * special_lookup(PyThreadState *, PyObject *, _Py_Identifier *);
static int check_args_iterable(PyThreadState *, PyObject *func, PyObject *vararg);
static void format_kwargs_error(PyThreadState *, PyObject *func, PyObject *kwargs);
static void format_awaitable_error(PyThreadState *, PyTypeObject *, int);
#define NAME_ERROR_MSG \
"name '%.200s' is not defined"
#define UNBOUNDLOCAL_ERROR_MSG \
"local variable '%.200s' referenced before assignment"
#define UNBOUNDFREE_ERROR_MSG \
"free variable '%.200s' referenced before assignment" \
" in enclosing scope"
/* Dynamic execution profile */
#ifdef DYNAMIC_EXECUTION_PROFILE
#ifdef DXPAIRS
static long dxpairs[257][256];
#define dxp dxpairs[256]
#else
static long dxp[256];
#endif
#endif
/* per opcode cache */
#ifdef Py_DEBUG
// --with-pydebug is used to find memory leak. opcache makes it harder.
// So we disable opcache when Py_DEBUG is defined.
// See bpo-37146
#define OPCACHE_MIN_RUNS 0 /* disable opcache */
#else
#define OPCACHE_MIN_RUNS 1024 /* create opcache when code executed this time */
#endif
#define OPCACHE_STATS 0 /* Enable stats */
#if OPCACHE_STATS
static size_t opcache_code_objects = 0;
static size_t opcache_code_objects_extra_mem = 0;
static size_t opcache_global_opts = 0;
static size_t opcache_global_hits = 0;
static size_t opcache_global_misses = 0;
#endif
#define GIL_REQUEST _Py_atomic_load_relaxed(&ceval->gil_drop_request)
/* This can set eval_breaker to 0 even though gil_drop_request became
1. We believe this is all right because the eval loop will release
the GIL eventually anyway. */
#define COMPUTE_EVAL_BREAKER(ceval) \
_Py_atomic_store_relaxed( \
&(ceval)->eval_breaker, \
GIL_REQUEST | \
_Py_atomic_load_relaxed(&(ceval)->signals_pending) | \
_Py_atomic_load_relaxed(&(ceval)->pending.calls_to_do) | \
(ceval)->pending.async_exc)
#define SET_GIL_DROP_REQUEST(ceval) \
do { \
_Py_atomic_store_relaxed(&(ceval)->gil_drop_request, 1); \
_Py_atomic_store_relaxed(&(ceval)->eval_breaker, 1); \
} while (0)
#define RESET_GIL_DROP_REQUEST(ceval) \
do { \
_Py_atomic_store_relaxed(&(ceval)->gil_drop_request, 0); \
COMPUTE_EVAL_BREAKER(ceval); \
} while (0)
/* Pending calls are only modified under pending_lock */
#define SIGNAL_PENDING_CALLS(ceval) \
do { \
_Py_atomic_store_relaxed(&(ceval)->pending.calls_to_do, 1); \
_Py_atomic_store_relaxed(&(ceval)->eval_breaker, 1); \
} while (0)
#define UNSIGNAL_PENDING_CALLS(ceval) \
do { \
_Py_atomic_store_relaxed(&(ceval)->pending.calls_to_do, 0); \
COMPUTE_EVAL_BREAKER(ceval); \
} while (0)
#define SIGNAL_PENDING_SIGNALS(ceval) \
do { \
_Py_atomic_store_relaxed(&(ceval)->signals_pending, 1); \
_Py_atomic_store_relaxed(&(ceval)->eval_breaker, 1); \
} while (0)
#define UNSIGNAL_PENDING_SIGNALS(ceval) \
do { \
_Py_atomic_store_relaxed(&(ceval)->signals_pending, 0); \
COMPUTE_EVAL_BREAKER(ceval); \
} while (0)
#define SIGNAL_ASYNC_EXC(ceval) \
do { \
(ceval)->pending.async_exc = 1; \
_Py_atomic_store_relaxed(&(ceval)->eval_breaker, 1); \
} while (0)
#define UNSIGNAL_ASYNC_EXC(ceval) \
do { \
(ceval)->pending.async_exc = 0; \
COMPUTE_EVAL_BREAKER(ceval); \
} while (0)
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#include "pythread.h"
#include "ceval_gil.h"
int
PyEval_ThreadsInitialized(void)
{
return gil_created(&_PyRuntime.ceval.gil);
}
void
PyEval_InitThreads(void)
{
_PyRuntimeState *runtime = &_PyRuntime;
struct _ceval_runtime_state *ceval = &runtime->ceval;
struct _gil_runtime_state *gil = &ceval->gil;
if (gil_created(gil)) {
return;
}
PyThread_init_thread();
create_gil(gil);
PyThreadState *tstate = _PyRuntimeState_GetThreadState(runtime);
take_gil(ceval, tstate);
struct _pending_calls *pending = &ceval->pending;
pending->lock = PyThread_allocate_lock();
if (pending->lock == NULL) {
Py_FatalError("Can't initialize threads for pending calls");
}
}
void
_PyEval_FiniThreads(struct _ceval_runtime_state *ceval)
{
struct _gil_runtime_state *gil = &ceval->gil;
if (!gil_created(gil)) {
return;
}
destroy_gil(gil);
assert(!gil_created(gil));
struct _pending_calls *pending = &ceval->pending;
if (pending->lock != NULL) {
PyThread_free_lock(pending->lock);
pending->lock = NULL;
}
}
static inline void
exit_thread_if_finalizing(_PyRuntimeState *runtime, PyThreadState *tstate)
{
/* _Py_Finalizing is protected by the GIL */
if (runtime->finalizing != NULL && !_Py_CURRENTLY_FINALIZING(runtime, tstate)) {
drop_gil(&runtime->ceval, tstate);
PyThread_exit_thread();
}
}
void
_PyEval_Fini(void)
{
#if OPCACHE_STATS
fprintf(stderr, "-- Opcode cache number of objects = %zd\n",
opcache_code_objects);
fprintf(stderr, "-- Opcode cache total extra mem = %zd\n",
opcache_code_objects_extra_mem);
fprintf(stderr, "\n");
fprintf(stderr, "-- Opcode cache LOAD_GLOBAL hits = %zd (%d%%)\n",
opcache_global_hits,
(int) (100.0 * opcache_global_hits /
(opcache_global_hits + opcache_global_misses)));
fprintf(stderr, "-- Opcode cache LOAD_GLOBAL misses = %zd (%d%%)\n",
opcache_global_misses,
(int) (100.0 * opcache_global_misses /
(opcache_global_hits + opcache_global_misses)));
fprintf(stderr, "-- Opcode cache LOAD_GLOBAL opts = %zd\n",
opcache_global_opts);
fprintf(stderr, "\n");
#endif
}
void
PyEval_AcquireLock(void)
{
_PyRuntimeState *runtime = &_PyRuntime;
struct _ceval_runtime_state *ceval = &runtime->ceval;
PyThreadState *tstate = _PyRuntimeState_GetThreadState(runtime);
if (tstate == NULL) {
Py_FatalError("PyEval_AcquireLock: current thread state is NULL");
}
take_gil(ceval, tstate);
exit_thread_if_finalizing(runtime, tstate);
}
void
PyEval_ReleaseLock(void)
{
_PyRuntimeState *runtime = &_PyRuntime;
PyThreadState *tstate = _PyRuntimeState_GetThreadState(runtime);
/* This function must succeed when the current thread state is NULL.
We therefore avoid PyThreadState_Get() which dumps a fatal error
in debug mode.
*/
drop_gil(&runtime->ceval, tstate);
}
void
PyEval_AcquireThread(PyThreadState *tstate)
{
if (tstate == NULL) {
Py_FatalError("PyEval_AcquireThread: NULL new thread state");
}
_PyRuntimeState *runtime = &_PyRuntime;
struct _ceval_runtime_state *ceval = &runtime->ceval;
/* Check someone has called PyEval_InitThreads() to create the lock */
assert(gil_created(&ceval->gil));
take_gil(ceval, tstate);
exit_thread_if_finalizing(runtime, tstate);
if (_PyThreadState_Swap(&runtime->gilstate, tstate) != NULL) {
Py_FatalError("PyEval_AcquireThread: non-NULL old thread state");
}
}
void
PyEval_ReleaseThread(PyThreadState *tstate)
{
if (tstate == NULL) {
Py_FatalError("PyEval_ReleaseThread: NULL thread state");
}
_PyRuntimeState *runtime = &_PyRuntime;
PyThreadState *new_tstate = _PyThreadState_Swap(&runtime->gilstate, NULL);
if (new_tstate != tstate) {
Py_FatalError("PyEval_ReleaseThread: wrong thread state");
}
drop_gil(&runtime->ceval, tstate);
}
/* This function is called from PyOS_AfterFork_Child to destroy all threads
* which are not running in the child process, and clear internal locks
* which might be held by those threads.
*/
void
_PyEval_ReInitThreads(_PyRuntimeState *runtime)
{
struct _ceval_runtime_state *ceval = &runtime->ceval;
if (!gil_created(&ceval->gil)) {
return;
}
recreate_gil(&ceval->gil);
PyThreadState *current_tstate = _PyRuntimeState_GetThreadState(runtime);
take_gil(ceval, current_tstate);
struct _pending_calls *pending = &ceval->pending;
pending->lock = PyThread_allocate_lock();
if (pending->lock == NULL) {
Py_FatalError("Can't initialize threads for pending calls");
}
/* Destroy all threads except the current one */
_PyThreadState_DeleteExcept(runtime, current_tstate);
}
/* This function is used to signal that async exceptions are waiting to be
raised. */
void
_PyEval_SignalAsyncExc(struct _ceval_runtime_state *ceval)
{
SIGNAL_ASYNC_EXC(ceval);
}
PyThreadState *
PyEval_SaveThread(void)
{
_PyRuntimeState *runtime = &_PyRuntime;
struct _ceval_runtime_state *ceval = &runtime->ceval;
PyThreadState *tstate = _PyThreadState_Swap(&runtime->gilstate, NULL);
if (tstate == NULL) {
Py_FatalError("PyEval_SaveThread: NULL tstate");
}
assert(gil_created(&ceval->gil));
drop_gil(ceval, tstate);
return tstate;
}
void
PyEval_RestoreThread(PyThreadState *tstate)
{
_PyRuntimeState *runtime = &_PyRuntime;
struct _ceval_runtime_state *ceval = &runtime->ceval;
if (tstate == NULL) {
Py_FatalError("PyEval_RestoreThread: NULL tstate");
}
assert(gil_created(&ceval->gil));
int err = errno;
take_gil(ceval, tstate);
exit_thread_if_finalizing(runtime, tstate);
errno = err;
_PyThreadState_Swap(&runtime->gilstate, tstate);
}
/* Mechanism whereby asynchronously executing callbacks (e.g. UNIX
signal handlers or Mac I/O completion routines) can schedule calls
to a function to be called synchronously.
The synchronous function is called with one void* argument.
It should return 0 for success or -1 for failure -- failure should
be accompanied by an exception.
If registry succeeds, the registry function returns 0; if it fails
(e.g. due to too many pending calls) it returns -1 (without setting
an exception condition).
Note that because registry may occur from within signal handlers,
or other asynchronous events, calling malloc() is unsafe!
Any thread can schedule pending calls, but only the main thread
will execute them.
There is no facility to schedule calls to a particular thread, but
that should be easy to change, should that ever be required. In
that case, the static variables here should go into the python
threadstate.
*/
void
_PyEval_SignalReceived(struct _ceval_runtime_state *ceval)
{
/* bpo-30703: Function called when the C signal handler of Python gets a
signal. We cannot queue a callback using Py_AddPendingCall() since
that function is not async-signal-safe. */
SIGNAL_PENDING_SIGNALS(ceval);
}
/* Push one item onto the queue while holding the lock. */
static int
_push_pending_call(struct _pending_calls *pending,
int (*func)(void *), void *arg)
{
int i = pending->last;
int j = (i + 1) % NPENDINGCALLS;
if (j == pending->first) {
return -1; /* Queue full */
}
pending->calls[i].func = func;
pending->calls[i].arg = arg;
pending->last = j;
return 0;
}
/* Pop one item off the queue while holding the lock. */
static void
_pop_pending_call(struct _pending_calls *pending,
int (**func)(void *), void **arg)
{
int i = pending->first;
if (i == pending->last) {
return; /* Queue empty */
}
*func = pending->calls[i].func;
*arg = pending->calls[i].arg;
pending->first = (i + 1) % NPENDINGCALLS;
}
/* This implementation is thread-safe. It allows
scheduling to be made from any thread, and even from an executing
callback.
*/
int
_PyEval_AddPendingCall(PyThreadState *tstate,
struct _ceval_runtime_state *ceval,
int (*func)(void *), void *arg)
{
struct _pending_calls *pending = &ceval->pending;
PyThread_acquire_lock(pending->lock, WAIT_LOCK);
if (pending->finishing) {
PyThread_release_lock(pending->lock);
PyObject *exc, *val, *tb;
_PyErr_Fetch(tstate, &exc, &val, &tb);
_PyErr_SetString(tstate, PyExc_SystemError,
"Py_AddPendingCall: cannot add pending calls "
"(Python shutting down)");
_PyErr_Print(tstate);
_PyErr_Restore(tstate, exc, val, tb);
return -1;
}
int result = _push_pending_call(pending, func, arg);
PyThread_release_lock(pending->lock);
/* signal main loop */
SIGNAL_PENDING_CALLS(ceval);
return result;
}
int
Py_AddPendingCall(int (*func)(void *), void *arg)
{
_PyRuntimeState *runtime = &_PyRuntime;
PyThreadState *tstate = _PyRuntimeState_GetThreadState(runtime);
return _PyEval_AddPendingCall(tstate, &runtime->ceval, func, arg);
}
static int
handle_signals(_PyRuntimeState *runtime)
{
/* Only handle signals on main thread. PyEval_InitThreads must
* have been called already.
*/
if (PyThread_get_thread_ident() != runtime->main_thread) {
return 0;
}
/*
* Ensure that the thread isn't currently running some other
* interpreter.
*/
PyInterpreterState *interp = _PyRuntimeState_GetThreadState(runtime)->interp;
if (interp != runtime->interpreters.main) {
return 0;
}
struct _ceval_runtime_state *ceval = &runtime->ceval;
UNSIGNAL_PENDING_SIGNALS(ceval);
if (_PyErr_CheckSignals() < 0) {
SIGNAL_PENDING_SIGNALS(ceval); /* We're not done yet */
return -1;
}
return 0;
}
static int
make_pending_calls(_PyRuntimeState *runtime)
{
static int busy = 0;
/* only service pending calls on main thread */
if (PyThread_get_thread_ident() != runtime->main_thread) {
return 0;
}
/* don't perform recursive pending calls */
if (busy) {
return 0;
}
busy = 1;
struct _ceval_runtime_state *ceval = &runtime->ceval;
/* unsignal before starting to call callbacks, so that any callback
added in-between re-signals */
UNSIGNAL_PENDING_CALLS(ceval);
int res = 0;
/* perform a bounded number of calls, in case of recursion */
struct _pending_calls *pending = &ceval->pending;
for (int i=0; i<NPENDINGCALLS; i++) {
int (*func)(void *) = NULL;
void *arg = NULL;
/* pop one item off the queue while holding the lock */
PyThread_acquire_lock(pending->lock, WAIT_LOCK);
_pop_pending_call(pending, &func, &arg);
PyThread_release_lock(pending->lock);
/* having released the lock, perform the callback */
if (func == NULL) {
break;
}
res = func(arg);
if (res) {
goto error;
}
}
busy = 0;
return res;
error:
busy = 0;
SIGNAL_PENDING_CALLS(ceval);
return res;
}
void
_Py_FinishPendingCalls(_PyRuntimeState *runtime)
{
assert(PyGILState_Check());
PyThreadState *tstate = _PyRuntimeState_GetThreadState(runtime);
struct _pending_calls *pending = &runtime->ceval.pending;
PyThread_acquire_lock(pending->lock, WAIT_LOCK);
pending->finishing = 1;
PyThread_release_lock(pending->lock);
if (!_Py_atomic_load_relaxed(&(pending->calls_to_do))) {
return;
}
if (make_pending_calls(runtime) < 0) {
PyObject *exc, *val, *tb;
_PyErr_Fetch(tstate, &exc, &val, &tb);
PyErr_BadInternalCall();
_PyErr_ChainExceptions(exc, val, tb);
_PyErr_Print(tstate);
}
}
/* Py_MakePendingCalls() is a simple wrapper for the sake
of backward-compatibility. */
int
Py_MakePendingCalls(void)
{
assert(PyGILState_Check());
/* Python signal handler doesn't really queue a callback: it only signals
that a signal was received, see _PyEval_SignalReceived(). */
_PyRuntimeState *runtime = &_PyRuntime;
int res = handle_signals(runtime);
if (res != 0) {
return res;
}
res = make_pending_calls(runtime);
if (res != 0) {
return res;
}
return 0;
}
/* The interpreter's recursion limit */
#ifndef Py_DEFAULT_RECURSION_LIMIT
#define Py_DEFAULT_RECURSION_LIMIT 1000
#endif
int _Py_CheckRecursionLimit = Py_DEFAULT_RECURSION_LIMIT;
void
_PyEval_Initialize(struct _ceval_runtime_state *state)
{
state->recursion_limit = Py_DEFAULT_RECURSION_LIMIT;
_Py_CheckRecursionLimit = Py_DEFAULT_RECURSION_LIMIT;
_gil_initialize(&state->gil);
}
int
Py_GetRecursionLimit(void)
{
return _PyRuntime.ceval.recursion_limit;
}
void
Py_SetRecursionLimit(int new_limit)
{
struct _ceval_runtime_state *ceval = &_PyRuntime.ceval;
ceval->recursion_limit = new_limit;
_Py_CheckRecursionLimit = ceval->recursion_limit;
}
/* the macro Py_EnterRecursiveCall() only calls _Py_CheckRecursiveCall()
if the recursion_depth reaches _Py_CheckRecursionLimit.
If USE_STACKCHECK, the macro decrements _Py_CheckRecursionLimit
to guarantee that _Py_CheckRecursiveCall() is regularly called.
Without USE_STACKCHECK, there is no need for this. */
int
_Py_CheckRecursiveCall(const char *where)
{
_PyRuntimeState *runtime = &_PyRuntime;
PyThreadState *tstate = _PyRuntimeState_GetThreadState(runtime);
int recursion_limit = runtime->ceval.recursion_limit;
#ifdef USE_STACKCHECK
tstate->stackcheck_counter = 0;
if (PyOS_CheckStack()) {
--tstate->recursion_depth;
_PyErr_SetString(tstate, PyExc_MemoryError, "Stack overflow");
return -1;
}
/* Needed for ABI backwards-compatibility (see bpo-31857) */
_Py_CheckRecursionLimit = recursion_limit;
#endif
if (tstate->recursion_critical)
/* Somebody asked that we don't check for recursion. */
return 0;
if (tstate->overflowed) {
if (tstate->recursion_depth > recursion_limit + 50) {
/* Overflowing while handling an overflow. Give up. */
Py_FatalError("Cannot recover from stack overflow.");
}
return 0;
}
if (tstate->recursion_depth > recursion_limit) {
--tstate->recursion_depth;
tstate->overflowed = 1;
_PyErr_Format(tstate, PyExc_RecursionError,
"maximum recursion depth exceeded%s",
where);
return -1;
}
return 0;
}
static int do_raise(PyThreadState *tstate, PyObject *exc, PyObject *cause);
static int unpack_iterable(PyThreadState *, PyObject *, int, int, PyObject **);
#define _Py_TracingPossible(ceval) ((ceval)->tracing_possible)
PyObject *
PyEval_EvalCode(PyObject *co, PyObject *globals, PyObject *locals)
{
return PyEval_EvalCodeEx(co,
globals, locals,
(PyObject **)NULL, 0,
(PyObject **)NULL, 0,
(PyObject **)NULL, 0,
NULL, NULL);
}
/* Interpreter main loop */
PyObject *
PyEval_EvalFrame(PyFrameObject *f) {
/* This is for backward compatibility with extension modules that
used this API; core interpreter code should call
PyEval_EvalFrameEx() */
return PyEval_EvalFrameEx(f, 0);
}
PyObject *
PyEval_EvalFrameEx(PyFrameObject *f, int throwflag)
{
PyInterpreterState *interp = _PyInterpreterState_GET_UNSAFE();
return interp->eval_frame(f, throwflag);
}
PyObject* _Py_HOT_FUNCTION
_PyEval_EvalFrameDefault(PyFrameObject *f, int throwflag)
{
#ifdef DXPAIRS
int lastopcode = 0;
#endif
PyObject **stack_pointer; /* Next free slot in value stack */
const _Py_CODEUNIT *next_instr;
int opcode; /* Current opcode */
int oparg; /* Current opcode argument, if any */
PyObject **fastlocals, **freevars;
PyObject *retval = NULL; /* Return value */
_PyRuntimeState * const runtime = &_PyRuntime;
PyThreadState * const tstate = _PyRuntimeState_GetThreadState(runtime);
struct _ceval_runtime_state * const ceval = &runtime->ceval;
_Py_atomic_int * const eval_breaker = &ceval->eval_breaker;
PyCodeObject *co;
/* when tracing we set things up so that
not (instr_lb <= current_bytecode_offset < instr_ub)
is true when the line being executed has changed. The
initial values are such as to make this false the first
time it is tested. */
int instr_ub = -1, instr_lb = 0, instr_prev = -1;
const _Py_CODEUNIT *first_instr;
PyObject *names;
PyObject *consts;
_PyOpcache *co_opcache;
#ifdef LLTRACE
_Py_IDENTIFIER(__ltrace__);
#endif
/* Computed GOTOs, or
the-optimization-commonly-but-improperly-known-as-"threaded code"
using gcc's labels-as-values extension
(http://gcc.gnu.org/onlinedocs/gcc/Labels-as-Values.html).
The traditional bytecode evaluation loop uses a "switch" statement, which
decent compilers will optimize as a single indirect branch instruction
combined with a lookup table of jump addresses. However, since the
indirect jump instruction is shared by all opcodes, the CPU will have a
hard time making the right prediction for where to jump next (actually,
it will be always wrong except in the uncommon case of a sequence of
several identical opcodes).
"Threaded code" in contrast, uses an explicit jump table and an explicit
indirect jump instruction at the end of each opcode. Since the jump
instruction is at a different address for each opcode, the CPU will make a
separate prediction for each of these instructions, which is equivalent to
predicting the second opcode of each opcode pair. These predictions have
a much better chance to turn out valid, especially in small bytecode loops.
A mispredicted branch on a modern CPU flushes the whole pipeline and
can cost several CPU cycles (depending on the pipeline depth),
and potentially many more instructions (depending on the pipeline width).
A correctly predicted branch, however, is nearly free.
At the time of this writing, the "threaded code" version is up to 15-20%
faster than the normal "switch" version, depending on the compiler and the
CPU architecture.
We disable the optimization if DYNAMIC_EXECUTION_PROFILE is defined,
because it would render the measurements invalid.
NOTE: care must be taken that the compiler doesn't try to "optimize" the
indirect jumps by sharing them between all opcodes. Such optimizations
can be disabled on gcc by using the -fno-gcse flag (or possibly
-fno-crossjumping).
*/
#ifdef DYNAMIC_EXECUTION_PROFILE
#undef USE_COMPUTED_GOTOS
#define USE_COMPUTED_GOTOS 0
#endif
#ifdef HAVE_COMPUTED_GOTOS
#ifndef USE_COMPUTED_GOTOS
#define USE_COMPUTED_GOTOS 1
#endif
#else
#if defined(USE_COMPUTED_GOTOS) && USE_COMPUTED_GOTOS
#error "Computed gotos are not supported on this compiler."
#endif
#undef USE_COMPUTED_GOTOS
#define USE_COMPUTED_GOTOS 0
#endif
#if USE_COMPUTED_GOTOS
/* Import the static jump table */
#include "opcode_targets.h"
#define TARGET(op) \
op: \
TARGET_##op
#ifdef LLTRACE
#define FAST_DISPATCH() \
{ \
if (!lltrace && !_Py_TracingPossible(ceval) && !PyDTrace_LINE_ENABLED()) { \
f->f_lasti = INSTR_OFFSET(); \
NEXTOPARG(); \
goto *opcode_targets[opcode]; \
} \
goto fast_next_opcode; \
}
#else
#define FAST_DISPATCH() \
{ \
if (!_Py_TracingPossible(ceval) && !PyDTrace_LINE_ENABLED()) { \
f->f_lasti = INSTR_OFFSET(); \
NEXTOPARG(); \
goto *opcode_targets[opcode]; \
} \
goto fast_next_opcode; \
}
#endif
#define DISPATCH() \
{ \
if (!_Py_atomic_load_relaxed(eval_breaker)) { \
FAST_DISPATCH(); \
} \
continue; \
}
#else
#define TARGET(op) op
#define FAST_DISPATCH() goto fast_next_opcode
#define DISPATCH() continue
#endif
/* Tuple access macros */
#ifndef Py_DEBUG
#define GETITEM(v, i) PyTuple_GET_ITEM((PyTupleObject *)(v), (i))
#else
#define GETITEM(v, i) PyTuple_GetItem((v), (i))
#endif
/* Code access macros */
/* The integer overflow is checked by an assertion below. */
#define INSTR_OFFSET() \
(sizeof(_Py_CODEUNIT) * (int)(next_instr - first_instr))
#define NEXTOPARG() do { \
_Py_CODEUNIT word = *next_instr; \
opcode = _Py_OPCODE(word); \
oparg = _Py_OPARG(word); \
next_instr++; \
} while (0)
#define JUMPTO(x) (next_instr = first_instr + (x) / sizeof(_Py_CODEUNIT))
#define JUMPBY(x) (next_instr += (x) / sizeof(_Py_CODEUNIT))
/* OpCode prediction macros
Some opcodes tend to come in pairs thus making it possible to
predict the second code when the first is run. For example,
COMPARE_OP is often followed by POP_JUMP_IF_FALSE or POP_JUMP_IF_TRUE.
Verifying the prediction costs a single high-speed test of a register
variable against a constant. If the pairing was good, then the
processor's own internal branch predication has a high likelihood of
success, resulting in a nearly zero-overhead transition to the
next opcode. A successful prediction saves a trip through the eval-loop
including its unpredictable switch-case branch. Combined with the
processor's internal branch prediction, a successful PREDICT has the
effect of making the two opcodes run as if they were a single new opcode
with the bodies combined.
If collecting opcode statistics, your choices are to either keep the
predictions turned-on and interpret the results as if some opcodes
had been combined or turn-off predictions so that the opcode frequency
counter updates for both opcodes.
Opcode prediction is disabled with threaded code, since the latter allows
the CPU to record separate branch prediction information for each
opcode.
*/
#if defined(DYNAMIC_EXECUTION_PROFILE) || USE_COMPUTED_GOTOS
#define PREDICT(op) if (0) goto PRED_##op
#else
#define PREDICT(op) \
do{ \
_Py_CODEUNIT word = *next_instr; \
opcode = _Py_OPCODE(word); \
if (opcode == op){ \
oparg = _Py_OPARG(word); \
next_instr++; \
goto PRED_##op; \
} \
} while(0)
#endif
#define PREDICTED(op) PRED_##op:
/* Stack manipulation macros */
/* The stack can grow at most MAXINT deep, as co_nlocals and
co_stacksize are ints. */
#define STACK_LEVEL() ((int)(stack_pointer - f->f_valuestack))
#define EMPTY() (STACK_LEVEL() == 0)
#define TOP() (stack_pointer[-1])
#define SECOND() (stack_pointer[-2])
#define THIRD() (stack_pointer[-3])
#define FOURTH() (stack_pointer[-4])
#define PEEK(n) (stack_pointer[-(n)])
#define SET_TOP(v) (stack_pointer[-1] = (v))
#define SET_SECOND(v) (stack_pointer[-2] = (v))
#define SET_THIRD(v) (stack_pointer[-3] = (v))
#define SET_FOURTH(v) (stack_pointer[-4] = (v))
#define SET_VALUE(n, v) (stack_pointer[-(n)] = (v))
#define BASIC_STACKADJ(n) (stack_pointer += n)
#define BASIC_PUSH(v) (*stack_pointer++ = (v))
#define BASIC_POP() (*--stack_pointer)
#ifdef LLTRACE
#define PUSH(v) { (void)(BASIC_PUSH(v), \
lltrace && prtrace(tstate, TOP(), "push")); \
assert(STACK_LEVEL() <= co->co_stacksize); }
#define POP() ((void)(lltrace && prtrace(tstate, TOP(), "pop")), \
BASIC_POP())
#define STACK_GROW(n) do { \
assert(n >= 0); \
(void)(BASIC_STACKADJ(n), \
lltrace && prtrace(tstate, TOP(), "stackadj")); \
assert(STACK_LEVEL() <= co->co_stacksize); \
} while (0)
#define STACK_SHRINK(n) do { \
assert(n >= 0); \
(void)(lltrace && prtrace(tstate, TOP(), "stackadj")); \
(void)(BASIC_STACKADJ(-n)); \
assert(STACK_LEVEL() <= co->co_stacksize); \
} while (0)
#define EXT_POP(STACK_POINTER) ((void)(lltrace && \
prtrace(tstate, (STACK_POINTER)[-1], "ext_pop")), \
*--(STACK_POINTER))
#else
#define PUSH(v) BASIC_PUSH(v)
#define POP() BASIC_POP()
#define STACK_GROW(n) BASIC_STACKADJ(n)
#define STACK_SHRINK(n) BASIC_STACKADJ(-n)
#define EXT_POP(STACK_POINTER) (*--(STACK_POINTER))
#endif
/* Local variable macros */
#define GETLOCAL(i) (fastlocals[i])
/* The SETLOCAL() macro must not DECREF the local variable in-place and
then store the new value; it must copy the old value to a temporary
value, then store the new value, and then DECREF the temporary value.
This is because it is possible that during the DECREF the frame is
accessed by other code (e.g. a __del__ method or gc.collect()) and the
variable would be pointing to already-freed memory. */
#define SETLOCAL(i, value) do { PyObject *tmp = GETLOCAL(i); \
GETLOCAL(i) = value; \
Py_XDECREF(tmp); } while (0)
#define UNWIND_BLOCK(b) \
while (STACK_LEVEL() > (b)->b_level) { \
PyObject *v = POP(); \
Py_XDECREF(v); \
}
#define UNWIND_EXCEPT_HANDLER(b) \
do { \
PyObject *type, *value, *traceback; \
_PyErr_StackItem *exc_info; \
assert(STACK_LEVEL() >= (b)->b_level + 3); \
while (STACK_LEVEL() > (b)->b_level + 3) { \
value = POP(); \
Py_XDECREF(value); \
} \
exc_info = tstate->exc_info; \
type = exc_info->exc_type; \
value = exc_info->exc_value; \
traceback = exc_info->exc_traceback; \
exc_info->exc_type = POP(); \
exc_info->exc_value = POP(); \
exc_info->exc_traceback = POP(); \
Py_XDECREF(type); \
Py_XDECREF(value); \
Py_XDECREF(traceback); \
} while(0)
/* macros for opcode cache */
#define OPCACHE_CHECK() \
do { \
co_opcache = NULL; \
if (co->co_opcache != NULL) { \
unsigned char co_opt_offset = \
co->co_opcache_map[next_instr - first_instr]; \
if (co_opt_offset > 0) { \
assert(co_opt_offset <= co->co_opcache_size); \
co_opcache = &co->co_opcache[co_opt_offset - 1]; \
assert(co_opcache != NULL); \
} \
} \
} while (0)
#if OPCACHE_STATS
#define OPCACHE_STAT_GLOBAL_HIT() \
do { \
if (co->co_opcache != NULL) opcache_global_hits++; \
} while (0)
#define OPCACHE_STAT_GLOBAL_MISS() \
do { \
if (co->co_opcache != NULL) opcache_global_misses++; \
} while (0)
#define OPCACHE_STAT_GLOBAL_OPT() \
do { \
if (co->co_opcache != NULL) opcache_global_opts++; \
} while (0)
#else /* OPCACHE_STATS */
#define OPCACHE_STAT_GLOBAL_HIT()
#define OPCACHE_STAT_GLOBAL_MISS()
#define OPCACHE_STAT_GLOBAL_OPT()
#endif
/* Start of code */
/* push frame */
if (Py_EnterRecursiveCall(""))
return NULL;
tstate->frame = f;
if (tstate->use_tracing) {
if (tstate->c_tracefunc != NULL) {
/* tstate->c_tracefunc, if defined, is a
function that will be called on *every* entry
to a code block. Its return value, if not
None, is a function that will be called at
the start of each executed line of code.
(Actually, the function must return itself
in order to continue tracing.) The trace
functions are called with three arguments:
a pointer to the current frame, a string
indicating why the function is called, and
an argument which depends on the situation.
The global trace function is also called
whenever an exception is detected. */
if (call_trace_protected(tstate->c_tracefunc,
tstate->c_traceobj,
tstate, f, PyTrace_CALL, Py_None)) {
/* Trace function raised an error */
goto exit_eval_frame;
}
}
if (tstate->c_profilefunc != NULL) {
/* Similar for c_profilefunc, except it needn't
return itself and isn't called for "line" events */
if (call_trace_protected(tstate->c_profilefunc,
tstate->c_profileobj,
tstate, f, PyTrace_CALL, Py_None)) {
/* Profile function raised an error */
goto exit_eval_frame;
}
}
}
if (PyDTrace_FUNCTION_ENTRY_ENABLED())
dtrace_function_entry(f);
co = f->f_code;
names = co->co_names;
consts = co->co_consts;
fastlocals = f->f_localsplus;
freevars = f->f_localsplus + co->co_nlocals;
assert(PyBytes_Check(co->co_code));
assert(PyBytes_GET_SIZE(co->co_code) <= INT_MAX);
assert(PyBytes_GET_SIZE(co->co_code) % sizeof(_Py_CODEUNIT) == 0);
assert(_Py_IS_ALIGNED(PyBytes_AS_STRING(co->co_code), sizeof(_Py_CODEUNIT)));
first_instr = (_Py_CODEUNIT *) PyBytes_AS_STRING(co->co_code);
/*
f->f_lasti refers to the index of the last instruction,
unless it's -1 in which case next_instr should be first_instr.
YIELD_FROM sets f_lasti to itself, in order to repeatedly yield
multiple values.
When the PREDICT() macros are enabled, some opcode pairs follow in
direct succession without updating f->f_lasti. A successful
prediction effectively links the two codes together as if they
were a single new opcode; accordingly,f->f_lasti will point to
the first code in the pair (for instance, GET_ITER followed by
FOR_ITER is effectively a single opcode and f->f_lasti will point
to the beginning of the combined pair.)
*/
assert(f->f_lasti >= -1);
next_instr = first_instr;
if (f->f_lasti >= 0) {
assert(f->f_lasti % sizeof(_Py_CODEUNIT) == 0);
next_instr += f->f_lasti / sizeof(_Py_CODEUNIT) + 1;
}
stack_pointer = f->f_stacktop;
assert(stack_pointer != NULL);
f->f_stacktop = NULL; /* remains NULL unless yield suspends frame */
f->f_executing = 1;
if (co->co_opcache_flag < OPCACHE_MIN_RUNS) {
co->co_opcache_flag++;
if (co->co_opcache_flag == OPCACHE_MIN_RUNS) {
if (_PyCode_InitOpcache(co) < 0) {
goto exit_eval_frame;
}
#if OPCACHE_STATS
opcache_code_objects_extra_mem +=
PyBytes_Size(co->co_code) / sizeof(_Py_CODEUNIT) +
sizeof(_PyOpcache) * co->co_opcache_size;
opcache_code_objects++;
#endif
}
}
#ifdef LLTRACE
lltrace = _PyDict_GetItemId(f->f_globals, &PyId___ltrace__) != NULL;
#endif
if (throwflag) /* support for generator.throw() */
goto error;
#ifdef Py_DEBUG
/* PyEval_EvalFrameEx() must not be called with an exception set,
because it can clear it (directly or indirectly) and so the
caller loses its exception */
assert(!_PyErr_Occurred(tstate));
#endif
main_loop:
for (;;) {
assert(stack_pointer >= f->f_valuestack); /* else underflow */
assert(STACK_LEVEL() <= co->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
``pendingcalls_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 == SETUP_FINALLY ||
opcode == SETUP_WITH ||
opcode == BEFORE_ASYNC_WITH ||
opcode == YIELD_FROM) {
/* 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).
*/
goto fast_next_opcode;
}
if (_Py_atomic_load_relaxed(&ceval->signals_pending)) {
if (handle_signals(runtime) != 0) {
goto error;
}
}
if (_Py_atomic_load_relaxed(&ceval->pending.calls_to_do)) {
if (make_pending_calls(runtime) != 0) {
goto error;
}
}
if (_Py_atomic_load_relaxed(&ceval->gil_drop_request)) {
/* Give another thread a chance */
if (_PyThreadState_Swap(&runtime->gilstate, NULL) != tstate) {
Py_FatalError("ceval: tstate mix-up");
}
drop_gil(ceval, tstate);
/* Other threads may run now */
take_gil(ceval, tstate);
/* Check if we should make a quick exit. */
exit_thread_if_finalizing(runtime, tstate);
if (_PyThreadState_Swap(&runtime->gilstate, tstate) != NULL) {
Py_FatalError("ceval: orphan tstate");
}
}
/* Check for asynchronous exceptions. */
if (tstate->async_exc != NULL) {
PyObject *exc = tstate->async_exc;
tstate->async_exc = NULL;
UNSIGNAL_ASYNC_EXC(ceval);
_PyErr_SetNone(tstate, exc);
Py_DECREF(exc);
goto error;
}
}
fast_next_opcode:
f->f_lasti = INSTR_OFFSET();
if (PyDTrace_LINE_ENABLED())
maybe_dtrace_line(f, &instr_lb, &instr_ub, &instr_prev);
/* line-by-line tracing support */
if (_Py_TracingPossible(ceval) &&
tstate->c_tracefunc != NULL && !tstate->tracing) {
int err;
/* see maybe_call_line_trace
for expository comments */
f->f_stacktop = stack_pointer;
err = maybe_call_line_trace(tstate->c_tracefunc,
tstate->c_traceobj,
tstate, f,
&instr_lb, &instr_ub, &instr_prev);
/* Reload possibly changed frame fields */
JUMPTO(f->f_lasti);
if (f->f_stacktop != NULL) {
stack_pointer = f->f_stacktop;
f->f_stacktop = NULL;
}
if (err)
/* trace function raised an exception */
goto error;
}
/* Extract opcode and argument */
NEXTOPARG();
dispatch_opcode:
#ifdef DYNAMIC_EXECUTION_PROFILE
#ifdef DXPAIRS
dxpairs[lastopcode][opcode]++;
lastopcode = opcode;
#endif
dxp[opcode]++;
#endif
#ifdef LLTRACE
/* Instruction tracing */
if (lltrace) {
if (HAS_ARG(opcode)) {
printf("%d: %d, %d\n",
f->f_lasti, opcode, oparg);
}
else {
printf("%d: %d\n",
f->f_lasti, opcode);
}
}
#endif
switch (opcode) {
/* BEWARE!
It is essential that any operation that fails must goto error
and that all operation that succeed call [FAST_]DISPATCH() ! */
case TARGET(NOP): {
FAST_DISPATCH();
}
case TARGET(LOAD_FAST): {
PyObject *value = GETLOCAL(oparg);
if (value == NULL) {
format_exc_check_arg(tstate, PyExc_UnboundLocalError,
UNBOUNDLOCAL_ERROR_MSG,
PyTuple_GetItem(co->co_varnames, oparg));
goto error;
}
Py_INCREF(value);
PUSH(value);
FAST_DISPATCH();
}
case TARGET(LOAD_CONST): {
PREDICTED(LOAD_CONST);
PyObject *value = GETITEM(consts, oparg);
Py_INCREF(value);
PUSH(value);
FAST_DISPATCH();
}
case TARGET(STORE_FAST): {
PREDICTED(STORE_FAST);
PyObject *value = POP();
SETLOCAL(oparg, value);
FAST_DISPATCH();
}
case TARGET(POP_TOP): {
PyObject *value = POP();
Py_DECREF(value);
FAST_DISPATCH();
}
case TARGET(ROT_TWO): {
PyObject *top = TOP();
PyObject *second = SECOND();
SET_TOP(second);
SET_SECOND(top);
FAST_DISPATCH();
}
case TARGET(ROT_THREE): {
PyObject *top = TOP();
PyObject *second = SECOND();
PyObject *third = THIRD();
SET_TOP(second);
SET_SECOND(third);
SET_THIRD(top);
FAST_DISPATCH();
}
case TARGET(ROT_FOUR): {
PyObject *top = TOP();
PyObject *second = SECOND();
PyObject *third = THIRD();
PyObject *fourth = FOURTH();
SET_TOP(second);
SET_SECOND(third);
SET_THIRD(fourth);
SET_FOURTH(top);
FAST_DISPATCH();
}
case TARGET(DUP_TOP): {
PyObject *top = TOP();
Py_INCREF(top);
PUSH(top);
FAST_DISPATCH();
}
case TARGET(DUP_TOP_TWO): {
PyObject *top = TOP();
PyObject *second = SECOND();
Py_INCREF(top);
Py_INCREF(second);
STACK_GROW(2);
SET_TOP(top);
SET_SECOND(second);
FAST_DISPATCH();
}
case TARGET(UNARY_POSITIVE): {
PyObject *value = TOP();
PyObject *res = PyNumber_Positive(value);
Py_DECREF(value);
SET_TOP(res);
if (res == NULL)
goto error;
DISPATCH();
}
case TARGET(UNARY_NEGATIVE): {
PyObject *value = TOP();
PyObject *res = PyNumber_Negative(value);
Py_DECREF(value);
SET_TOP(res);
if (res == NULL)
goto error;
DISPATCH();
}
case TARGET(UNARY_NOT): {
PyObject *value = TOP();
int err = PyObject_IsTrue(value);
Py_DECREF(value);
if (err == 0) {
Py_INCREF(Py_True);
SET_TOP(Py_True);
DISPATCH();
}
else if (err > 0) {
Py_INCREF(Py_False);
SET_TOP(Py_False);
DISPATCH();
}
STACK_SHRINK(1);
goto error;
}
case TARGET(UNARY_INVERT): {
PyObject *value = TOP();
PyObject *res = PyNumber_Invert(value);
Py_DECREF(value);
SET_TOP(res);
if (res == NULL)
goto error;
DISPATCH();
}
case TARGET(BINARY_POWER): {
PyObject *exp = POP();
PyObject *base = TOP();
PyObject *res = PyNumber_Power(base, exp, Py_None);
Py_DECREF(base);
Py_DECREF(exp);
SET_TOP(res);
if (res == NULL)
goto error;
DISPATCH();
}
case TARGET(BINARY_MULTIPLY): {
PyObject *right = POP();
PyObject *left = TOP();
PyObject *res = PyNumber_Multiply(left, right);
Py_DECREF(left);
Py_DECREF(right);
SET_TOP(res);
if (res == NULL)
goto error;
DISPATCH();
}
case TARGET(BINARY_MATRIX_MULTIPLY): {
PyObject *right = POP();
PyObject *left = TOP();
PyObject *res = PyNumber_MatrixMultiply(left, right);
Py_DECREF(left);
Py_DECREF(right);
SET_TOP(res);
if (res == NULL)
goto error;
DISPATCH();
}
case TARGET(BINARY_TRUE_DIVIDE): {
PyObject *divisor = POP();
PyObject *dividend = TOP();
PyObject *quotient = PyNumber_TrueDivide(dividend, divisor);
Py_DECREF(dividend);
Py_DECREF(divisor);
SET_TOP(quotient);
if (quotient == NULL)
goto error;
DISPATCH();
}
case TARGET(BINARY_FLOOR_DIVIDE): {
PyObject *divisor = POP();
PyObject *dividend = TOP();
PyObject *quotient = PyNumber_FloorDivide(dividend, divisor);
Py_DECREF(dividend);
Py_DECREF(divisor);
SET_TOP(quotient);
if (quotient == NULL)
goto error;
DISPATCH();
}
case TARGET(BINARY_MODULO): {
PyObject *divisor = POP();
PyObject *dividend = TOP();
PyObject *res;
if (PyUnicode_CheckExact(dividend) && (
!PyUnicode_Check(divisor) || PyUnicode_CheckExact(divisor))) {
// fast path; string formatting, but not if the RHS is a str subclass
// (see issue28598)
res = PyUnicode_Format(dividend, divisor);
} else {
res = PyNumber_Remainder(dividend, divisor);
}
Py_DECREF(divisor);
Py_DECREF(dividend);
SET_TOP(res);
if (res == NULL)
goto error;
DISPATCH();
}
case TARGET(BINARY_ADD): {
PyObject *right = POP();
PyObject *left = TOP();
PyObject *sum;
/* NOTE(haypo): Please don't try to micro-optimize int+int on
CPython using bytecode, it is simply worthless.
See http://bugs.python.org/issue21955 and
http://bugs.python.org/issue10044 for the discussion. In short,
no patch shown any impact on a realistic benchmark, only a minor
speedup on microbenchmarks. */
if (PyUnicode_CheckExact(left) &&
PyUnicode_CheckExact(right)) {
sum = unicode_concatenate(tstate, left, right, f, next_instr);
/* unicode_concatenate consumed the ref to left */
}
else {
sum = PyNumber_Add(left, right);
Py_DECREF(left);
}
Py_DECREF(right);
SET_TOP(sum);
if (sum == NULL)
goto error;
DISPATCH();
}
case TARGET(BINARY_SUBTRACT): {
PyObject *right = POP();
PyObject *left = TOP();
PyObject *diff = PyNumber_Subtract(left, right);
Py_DECREF(right);
Py_DECREF(left);
SET_TOP(diff);
if (diff == NULL)
goto error;
DISPATCH();
}
case TARGET(BINARY_SUBSCR): {
PyObject *sub = POP();
PyObject *container = TOP();
PyObject *res = PyObject_GetItem(container, sub);
Py_DECREF(container);
Py_DECREF(sub);
SET_TOP(res);
if (res == NULL)
goto error;
DISPATCH();
}
case TARGET(BINARY_LSHIFT): {
PyObject *right = POP();
PyObject *left = TOP();
PyObject *res = PyNumber_Lshift(left, right);
Py_DECREF(left);
Py_DECREF(right);
SET_TOP(res);
if (res == NULL)
goto error;
DISPATCH();
}
case TARGET(BINARY_RSHIFT): {
PyObject *right = POP();
PyObject *left = TOP();
PyObject *res = PyNumber_Rshift(left, right);
Py_DECREF(left);
Py_DECREF(right);
SET_TOP(res);
if (res == NULL)
goto error;
DISPATCH();
}
case TARGET(BINARY_AND): {
PyObject *right = POP();
PyObject *left = TOP();
PyObject *res = PyNumber_And(left, right);
Py_DECREF(left);
Py_DECREF(right);
SET_TOP(res);
if (res == NULL)
goto error;
DISPATCH();
}
case TARGET(BINARY_XOR): {
PyObject *right = POP();
PyObject *left = TOP();
PyObject *res = PyNumber_Xor(left, right);
Py_DECREF(left);
Py_DECREF(right);
SET_TOP(res);
if (res == NULL)
goto error;
DISPATCH();
}
case TARGET(BINARY_OR): {
PyObject *right = POP();
PyObject *left = TOP();
PyObject *res = PyNumber_Or(left, right);
Py_DECREF(left);
Py_DECREF(right);
SET_TOP(res);
if (res == NULL)
goto error;
DISPATCH();
}
case TARGET(LIST_APPEND): {
PyObject *v = POP();
PyObject *list = PEEK(oparg);
int err;
err = PyList_Append(list, v);
Py_DECREF(v);
if (err != 0)
goto error;
PREDICT(JUMP_ABSOLUTE);
DISPATCH();
}
case TARGET(SET_ADD): {
PyObject *v = POP();
PyObject *set = PEEK(oparg);
int err;
err = PySet_Add(set, v);
Py_DECREF(v);
if (err != 0)
goto error;
PREDICT(JUMP_ABSOLUTE);
DISPATCH();
}
case TARGET(INPLACE_POWER): {
PyObject *exp = POP();
PyObject *base = TOP();
PyObject *res = PyNumber_InPlacePower(base, exp, Py_None);
Py_DECREF(base);
Py_DECREF(exp);
SET_TOP(res);
if (res == NULL)
goto error;
DISPATCH();
}
case TARGET(INPLACE_MULTIPLY): {
PyObject *right = POP();
PyObject *left = TOP();
PyObject *res = PyNumber_InPlaceMultiply(left, right);
Py_DECREF(left);
Py_DECREF(right);
SET_TOP(res);
if (res == NULL)
goto error;
DISPATCH();
}
case TARGET(INPLACE_MATRIX_MULTIPLY): {
PyObject *right = POP();
PyObject *left = TOP();
PyObject *res = PyNumber_InPlaceMatrixMultiply(left, right);
Py_DECREF(left);
Py_DECREF(right);
SET_TOP(res);
if (res == NULL)
goto error;
DISPATCH();
}
case TARGET(INPLACE_TRUE_DIVIDE): {
PyObject *divisor = POP();
PyObject *dividend = TOP();
PyObject *quotient = PyNumber_InPlaceTrueDivide(dividend, divisor);
Py_DECREF(dividend);
Py_DECREF(divisor);
SET_TOP(quotient);
if (quotient == NULL)
goto error;
DISPATCH();
}
case TARGET(INPLACE_FLOOR_DIVIDE): {
PyObject *divisor = POP();
PyObject *dividend = TOP();
PyObject *quotient = PyNumber_InPlaceFloorDivide(dividend, divisor);
Py_DECREF(dividend);
Py_DECREF(divisor);
SET_TOP(quotient);
if (quotient == NULL)
goto error;
DISPATCH();
}
case TARGET(INPLACE_MODULO): {
PyObject *right = POP();
PyObject *left = TOP();
PyObject *mod = PyNumber_InPlaceRemainder(left, right);
Py_DECREF(left);
Py_DECREF(right);
SET_TOP(mod);
if (mod == NULL)
goto error;
DISPATCH();
}
case TARGET(INPLACE_ADD): {
PyObject *right = POP();
PyObject *left = TOP();
PyObject *sum;
if (PyUnicode_CheckExact(left) && PyUnicode_CheckExact(right)) {
sum = unicode_concatenate(tstate, left, right, f, next_instr);
/* unicode_concatenate consumed the ref to left */
}
else {
sum = PyNumber_InPlaceAdd(left, right);
Py_DECREF(left);
}
Py_DECREF(right);
SET_TOP(sum);
if (sum == NULL)
goto error;
DISPATCH();
}
case TARGET(INPLACE_SUBTRACT): {
PyObject *right = POP();
PyObject *left = TOP();
PyObject *diff = PyNumber_InPlaceSubtract(left, right);
Py_DECREF(left);
Py_DECREF(right);
SET_TOP(diff);
if (diff == NULL)
goto error;
DISPATCH();
}
case TARGET(INPLACE_LSHIFT): {
PyObject *right = POP();
PyObject *left = TOP();
PyObject *res = PyNumber_InPlaceLshift(left, right);
Py_DECREF(left);
Py_DECREF(right);
SET_TOP(res);
if (res == NULL)
goto error;
DISPATCH();
}
case TARGET(INPLACE_RSHIFT): {
PyObject *right = POP();
PyObject *left = TOP();
PyObject *res = PyNumber_InPlaceRshift(left, right);
Py_DECREF(left);
Py_DECREF(right);
SET_TOP(res);
if (res == NULL)
goto error;
DISPATCH();
}
case TARGET(INPLACE_AND): {
PyObject *right = POP();
PyObject *left = TOP();
PyObject *res = PyNumber_InPlaceAnd(left, right);
Py_DECREF(left);
Py_DECREF(right);
SET_TOP(res);
if (res == NULL)
goto error;
DISPATCH();
}
case TARGET(INPLACE_XOR): {
PyObject *right = POP();
PyObject *left = TOP();
PyObject *res = PyNumber_InPlaceXor(left, right);
Py_DECREF(left);
Py_DECREF(right);
SET_TOP(res);
if (res == NULL)
goto error;
DISPATCH();
}
case TARGET(INPLACE_OR): {
PyObject *right = POP();
PyObject *left = TOP();
PyObject *res = PyNumber_InPlaceOr(left, right);
Py_DECREF(left);
Py_DECREF(right);
SET_TOP(res);
if (res == NULL)
goto error;
DISPATCH();
}
case TARGET(STORE_SUBSCR): {
PyObject *sub = TOP();
PyObject *container = SECOND();
PyObject *v = THIRD();
int err;
STACK_SHRINK(3);
/* container[sub] = v */
err = PyObject_SetItem(container, sub, v);
Py_DECREF(v);
Py_DECREF(container);
Py_DECREF(sub);
if (err != 0)
goto error;
DISPATCH();
}
case TARGET(DELETE_SUBSCR): {
PyObject *sub = TOP();
PyObject *container = SECOND();
int err;
STACK_SHRINK(2);
/* del container[sub] */
err = PyObject_DelItem(container, sub);
Py_DECREF(container);
Py_DECREF(sub);
if (err != 0)
goto error;
DISPATCH();
}
case TARGET(PRINT_EXPR): {
_Py_IDENTIFIER(displayhook);
PyObject *value = POP();
PyObject *hook = _PySys_GetObjectId(&PyId_displayhook);
PyObject *res;
if (hook == NULL) {
_PyErr_SetString(tstate, PyExc_RuntimeError,
"lost sys.displayhook");
Py_DECREF(value);
goto error;
}
res = PyObject_CallFunctionObjArgs(hook, value, NULL);
Py_DECREF(value);
if (res == NULL)
goto error;
Py_DECREF(res);
DISPATCH();
}
case TARGET(RAISE_VARARGS): {
PyObject *cause = NULL, *exc = NULL;
switch (oparg) {
case 2:
cause = POP(); /* cause */
/* fall through */
case 1:
exc = POP(); /* exc */
/* fall through */
case 0:
if (do_raise(tstate, exc, cause)) {
goto exception_unwind;
}
break;
default:
_PyErr_SetString(tstate, PyExc_SystemError,
"bad RAISE_VARARGS oparg");
break;
}
goto error;
}
case TARGET(RETURN_VALUE): {
retval = POP();
assert(f->f_iblock == 0);
goto exit_returning;
}
case TARGET(GET_AITER): {
unaryfunc getter = NULL;
PyObject *iter = NULL;
PyObject *obj = TOP();
PyTypeObject *type = Py_TYPE(obj);
if (type->tp_as_async != NULL) {
getter = type->tp_as_async->am_aiter;
}
if (getter != NULL) {
iter = (*getter)(obj);
Py_DECREF(obj);
if (iter == NULL) {
SET_TOP(NULL);
goto error;
}
}
else {
SET_TOP(NULL);
_PyErr_Format(tstate, PyExc_TypeError,
"'async for' requires an object with "
"__aiter__ method, got %.100s",
type->tp_name);
Py_DECREF(obj);
goto error;
}
if (Py_TYPE(iter)->tp_as_async == NULL ||
Py_TYPE(iter)->tp_as_async->am_anext == NULL) {
SET_TOP(NULL);
_PyErr_Format(tstate, PyExc_TypeError,
"'async for' received an object from __aiter__ "
"that does not implement __anext__: %.100s",
Py_TYPE(iter)->tp_name);
Py_DECREF(iter);
goto error;
}
SET_TOP(iter);
DISPATCH();
}
case TARGET(GET_ANEXT): {
unaryfunc getter = NULL;
PyObject *next_iter = NULL;
PyObject *awaitable = NULL;
PyObject *aiter = TOP();
PyTypeObject *type = Py_TYPE(aiter);
if (PyAsyncGen_CheckExact(aiter)) {
awaitable = type->tp_as_async->am_anext(aiter);
if (awaitable == NULL) {
goto error;
}
} else {
if (type->tp_as_async != NULL){
getter = type->tp_as_async->am_anext;
}
if (getter != NULL) {
next_iter = (*getter)(aiter);
if (next_iter == NULL) {
goto error;
}
}
else {
_PyErr_Format(tstate, PyExc_TypeError,
"'async for' requires an iterator with "
"__anext__ method, got %.100s",
type->tp_name);
goto error;
}
awaitable = _PyCoro_GetAwaitableIter(next_iter);
if (awaitable == NULL) {
_PyErr_FormatFromCause(
PyExc_TypeError,
"'async for' received an invalid object "
"from __anext__: %.100s",
Py_TYPE(next_iter)->tp_name);
Py_DECREF(next_iter);
goto error;
} else {
Py_DECREF(next_iter);
}
}
PUSH(awaitable);
PREDICT(LOAD_CONST);
DISPATCH();
}
case TARGET(GET_AWAITABLE): {
PREDICTED(GET_AWAITABLE);
PyObject *iterable = TOP();
PyObject *iter = _PyCoro_GetAwaitableIter(iterable);
if (iter == NULL) {
format_awaitable_error(tstate, Py_TYPE(iterable),
_Py_OPCODE(next_instr[-2]));
}
Py_DECREF(iterable);
if (iter != NULL && PyCoro_CheckExact(iter)) {
PyObject *yf = _PyGen_yf((PyGenObject*)iter);
if (yf != NULL) {
/* `iter` is a coroutine object that is being
awaited, `yf` is a pointer to the current awaitable
being awaited on. */
Py_DECREF(yf);
Py_CLEAR(iter);
_PyErr_SetString(tstate, PyExc_RuntimeError,
"coroutine is being awaited already");
/* The code below jumps to `error` if `iter` is NULL. */
}
}
SET_TOP(iter); /* Even if it's NULL */
if (iter == NULL) {
goto error;
}
PREDICT(LOAD_CONST);
DISPATCH();
}
case TARGET(YIELD_FROM): {
PyObject *v = POP();
PyObject *receiver = TOP();
int err;
if (PyGen_CheckExact(receiver) || PyCoro_CheckExact(receiver)) {
retval = _PyGen_Send((PyGenObject *)receiver, v);
} else {
_Py_IDENTIFIER(send);
if (v == Py_None)
retval = Py_TYPE(receiver)->tp_iternext(receiver);
else
retval = _PyObject_CallMethodIdObjArgs(receiver, &PyId_send, v, NULL);
}
Py_DECREF(v);
if (retval == NULL) {
PyObject *val;
if (tstate->c_tracefunc != NULL
&& _PyErr_ExceptionMatches(tstate, PyExc_StopIteration))
call_exc_trace(tstate->c_tracefunc, tstate->c_traceobj, tstate, f);
err = _PyGen_FetchStopIterationValue(&val);
if (err < 0)
goto error;
Py_DECREF(receiver);
SET_TOP(val);
DISPATCH();
}
/* receiver remains on stack, retval is value to be yielded */
f->f_stacktop = stack_pointer;
/* and repeat... */
assert(f->f_lasti >= (int)sizeof(_Py_CODEUNIT));
f->f_lasti -= sizeof(_Py_CODEUNIT);
goto exit_yielding;
}
case TARGET(YIELD_VALUE): {
retval = POP();
if (co->co_flags & CO_ASYNC_GENERATOR) {
PyObject *w = _PyAsyncGenValueWrapperNew(retval);
Py_DECREF(retval);
if (w == NULL) {
retval = NULL;
goto error;
}
retval = w;
}
f->f_stacktop = stack_pointer;
goto exit_yielding;
}
case TARGET(POP_EXCEPT): {
PyObject *type, *value, *traceback;
_PyErr_StackItem *exc_info;
PyTryBlock *b = PyFrame_BlockPop(f);
if (b->b_type != EXCEPT_HANDLER) {
_PyErr_SetString(tstate, PyExc_SystemError,
"popped block is not an except handler");
goto error;
}
assert(STACK_LEVEL() >= (b)->b_level + 3 &&
STACK_LEVEL() <= (b)->b_level + 4);
exc_info = tstate->exc_info;
type = exc_info->exc_type;
value = exc_info->exc_value;
traceback = exc_info->exc_traceback;
exc_info->exc_type = POP();
exc_info->exc_value = POP();
exc_info->exc_traceback = POP();
Py_XDECREF(type);
Py_XDECREF(value);
Py_XDECREF(traceback);
DISPATCH();
}
case TARGET(POP_BLOCK): {
PREDICTED(POP_BLOCK);
PyFrame_BlockPop(f);
DISPATCH();
}
case TARGET(POP_FINALLY): {
/* If oparg is 0 at the top of the stack are 1 or 6 values:
Either:
- TOP = NULL or an integer
or:
- (TOP, SECOND, THIRD) = exc_info()
- (FOURTH, FITH, SIXTH) = previous exception for EXCEPT_HANDLER
If oparg is 1 the value for 'return' was additionally pushed
at the top of the stack.
*/
PyObject *res = NULL;
if (oparg) {
res = POP();
}
PyObject *exc = POP();
if (exc == NULL || PyLong_CheckExact(exc)) {
Py_XDECREF(exc);
}
else {
Py_DECREF(exc);
Py_DECREF(POP());
Py_DECREF(POP());
PyObject *type, *value, *traceback;
_PyErr_StackItem *exc_info;
PyTryBlock *b = PyFrame_BlockPop(f);
if (b->b_type != EXCEPT_HANDLER) {
_PyErr_SetString(tstate, PyExc_SystemError,
"popped block is not an except handler");
Py_XDECREF(res);
goto error;
}
assert(STACK_LEVEL() == (b)->b_level + 3);
exc_info = tstate->exc_info;
type = exc_info->exc_type;
value = exc_info->exc_value;
traceback = exc_info->exc_traceback;
exc_info->exc_type = POP();
exc_info->exc_value = POP();
exc_info->exc_traceback = POP();
Py_XDECREF(type);
Py_XDECREF(value);
Py_XDECREF(traceback);
}
if (oparg) {
PUSH(res);
}
DISPATCH();
}
case TARGET(CALL_FINALLY): {
PyObject *ret = PyLong_FromLong(INSTR_OFFSET());
if (ret == NULL) {
goto error;
}
PUSH(ret);
JUMPBY(oparg);
FAST_DISPATCH();
}
case TARGET(BEGIN_FINALLY): {
/* Push NULL onto the stack for using it in END_FINALLY,
POP_FINALLY, WITH_CLEANUP_START and WITH_CLEANUP_FINISH.
*/
PUSH(NULL);
FAST_DISPATCH();
}
case TARGET(END_FINALLY): {
PREDICTED(END_FINALLY);
/* At the top of the stack are 1 or 6 values:
Either:
- TOP = NULL or an integer
or:
- (TOP, SECOND, THIRD) = exc_info()
- (FOURTH, FITH, SIXTH) = previous exception for EXCEPT_HANDLER
*/
PyObject *exc = POP();
if (exc == NULL) {
FAST_DISPATCH();
}
else if (PyLong_CheckExact(exc)) {
int ret = _PyLong_AsInt(exc);
Py_DECREF(exc);
if (ret == -1 && _PyErr_Occurred(tstate)) {
goto error;
}
JUMPTO(ret);
FAST_DISPATCH();
}
else {
assert(PyExceptionClass_Check(exc));
PyObject *val = POP();
PyObject *tb = POP();
_PyErr_Restore(tstate, exc, val, tb);
goto exception_unwind;
}
}
case TARGET(END_ASYNC_FOR): {
PyObject *exc = POP();
assert(PyExceptionClass_Check(exc));
if (PyErr_GivenExceptionMatches(exc, PyExc_StopAsyncIteration)) {
PyTryBlock *b = PyFrame_BlockPop(f);
assert(b->b_type == EXCEPT_HANDLER);
Py_DECREF(exc);
UNWIND_EXCEPT_HANDLER(b);
Py_DECREF(POP());
JUMPBY(oparg);
FAST_DISPATCH();
}
else {
PyObject *val = POP();
PyObject *tb = POP();
_PyErr_Restore(tstate, exc, val, tb);
goto exception_unwind;
}
}
case TARGET(LOAD_BUILD_CLASS): {
_Py_IDENTIFIER(__build_class__);
PyObject *bc;
if (PyDict_CheckExact(f->f_builtins)) {
bc = _PyDict_GetItemIdWithError(f->f_builtins, &PyId___build_class__);
if (bc == NULL) {
if (!_PyErr_Occurred(tstate)) {
_PyErr_SetString(tstate, PyExc_NameError,
"__build_class__ not found");
}
goto error;
}
Py_INCREF(bc);
}
else {
PyObject *build_class_str = _PyUnicode_FromId(&PyId___build_class__);
if (build_class_str == NULL)
goto error;
bc = PyObject_GetItem(f->f_builtins, build_class_str);
if (bc == NULL) {
if (_PyErr_ExceptionMatches(tstate, PyExc_KeyError))
_PyErr_SetString(tstate, PyExc_NameError,
"__build_class__ not found");
goto error;
}
}
PUSH(bc);
DISPATCH();
}
case TARGET(STORE_NAME): {
PyObject *name = GETITEM(names, oparg);
PyObject *v = POP();
PyObject *ns = f->f_locals;
int err;
if (ns == NULL) {
_PyErr_Format(tstate, PyExc_SystemError,
"no locals found when storing %R", name);
Py_DECREF(v);
goto error;
}
if (PyDict_CheckExact(ns))
err = PyDict_SetItem(ns, name, v);
else
err = PyObject_SetItem(ns, name, v);
Py_DECREF(v);
if (err != 0)
goto error;
DISPATCH();
}
case TARGET(DELETE_NAME): {
PyObject *name = GETITEM(names, oparg);
PyObject *ns = f->f_locals;
int err;
if (ns == NULL) {
_PyErr_Format(tstate, PyExc_SystemError,
"no locals when deleting %R", name);
goto error;
}
err = PyObject_DelItem(ns, name);
if (err != 0) {
format_exc_check_arg(tstate, PyExc_NameError,
NAME_ERROR_MSG,
name);
goto error;
}
DISPATCH();
}
case TARGET(UNPACK_SEQUENCE): {
PREDICTED(UNPACK_SEQUENCE);
PyObject *seq = POP(), *item, **items;
if (PyTuple_CheckExact(seq) &&
PyTuple_GET_SIZE(seq) == oparg) {
items = ((PyTupleObject *)seq)->ob_item;
while (oparg--) {
item = items[oparg];
Py_INCREF(item);
PUSH(item);
}
} else if (PyList_CheckExact(seq) &&
PyList_GET_SIZE(seq) == oparg) {
items = ((PyListObject *)seq)->ob_item;
while (oparg--) {
item = items[oparg];
Py_INCREF(item);
PUSH(item);
}
} else if (unpack_iterable(tstate, seq, oparg, -1,
stack_pointer + oparg)) {
STACK_GROW(oparg);
} else {
/* unpack_iterable() raised an exception */
Py_DECREF(seq);
goto error;
}
Py_DECREF(seq);
DISPATCH();
}
case TARGET(UNPACK_EX): {
int totalargs = 1 + (oparg & 0xFF) + (oparg >> 8);
PyObject *seq = POP();
if (unpack_iterable(tstate, seq, oparg & 0xFF, oparg >> 8,
stack_pointer + totalargs)) {
stack_pointer += totalargs;
} else {
Py_DECREF(seq);
goto error;
}
Py_DECREF(seq);
DISPATCH();
}
case TARGET(STORE_ATTR): {
PyObject *name = GETITEM(names, oparg);
PyObject *owner = TOP();
PyObject *v = SECOND();
int err;
STACK_SHRINK(2);
err = PyObject_SetAttr(owner, name, v);
Py_DECREF(v);
Py_DECREF(owner);
if (err != 0)
goto error;
DISPATCH();
}
case TARGET(DELETE_ATTR): {
PyObject *name = GETITEM(names, oparg);
PyObject *owner = POP();
int err;
err = PyObject_SetAttr(owner, name, (PyObject *)NULL);
Py_DECREF(owner);
if (err != 0)
goto error;
DISPATCH();
}
case TARGET(STORE_GLOBAL): {
PyObject *name = GETITEM(names, oparg);
PyObject *v = POP();
int err;
err = PyDict_SetItem(f->f_globals, name, v);
Py_DECREF(v);
if (err != 0)
goto error;
DISPATCH();
}
case TARGET(DELETE_GLOBAL): {
PyObject *name = GETITEM(names, oparg);
int err;
err = PyDict_DelItem(f->f_globals, name);
if (err != 0) {
if (_PyErr_ExceptionMatches(tstate, PyExc_KeyError)) {
format_exc_check_arg(tstate, PyExc_NameError,
NAME_ERROR_MSG, name);
}
goto error;
}
DISPATCH();
}
case TARGET(LOAD_NAME): {
PyObject *name = GETITEM(names, oparg);
PyObject *locals = f->f_locals;
PyObject *v;
if (locals == NULL) {
_PyErr_Format(tstate, PyExc_SystemError,
"no locals when loading %R", name);
goto error;
}
if (PyDict_CheckExact(locals)) {
v = PyDict_GetItemWithError(locals, name);
if (v != NULL) {
Py_INCREF(v);
}
else if (_PyErr_Occurred(tstate)) {
goto error;
}
}
else {
v = PyObject_GetItem(locals, name);
if (v == NULL) {
if (!_PyErr_ExceptionMatches(tstate, PyExc_KeyError))
goto error;
_PyErr_Clear(tstate);
}
}
if (v == NULL) {
v = PyDict_GetItemWithError(f->f_globals, name);
if (v != NULL) {
Py_INCREF(v);
}
else if (_PyErr_Occurred(tstate)) {
goto error;
}
else {
if (PyDict_CheckExact(f->f_builtins)) {
v = PyDict_GetItemWithError(f->f_builtins, name);
if (v == NULL) {
if (!_PyErr_Occurred(tstate)) {
format_exc_check_arg(
tstate, PyExc_NameError,
NAME_ERROR_MSG, name);
}
goto error;
}
Py_INCREF(v);
}
else {
v = PyObject_GetItem(f->f_builtins, name);
if (v == NULL) {
if (_PyErr_ExceptionMatches(tstate, PyExc_KeyError)) {
format_exc_check_arg(
tstate, PyExc_NameError,
NAME_ERROR_MSG, name);
}
goto error;
}
}
}
}
PUSH(v);
DISPATCH();
}
case TARGET(LOAD_GLOBAL): {
PyObject *name;
PyObject *v;
if (PyDict_CheckExact(f->f_globals)
&& PyDict_CheckExact(f->f_builtins))
{
OPCACHE_CHECK();
if (co_opcache != NULL && co_opcache->optimized > 0) {
_PyOpcache_LoadGlobal *lg = &co_opcache->u.lg;
if (lg->globals_ver ==
((PyDictObject *)f->f_globals)->ma_version_tag
&& lg->builtins_ver ==
((PyDictObject *)f->f_builtins)->ma_version_tag)
{
PyObject *ptr = lg->ptr;
OPCACHE_STAT_GLOBAL_HIT();
assert(ptr != NULL);
Py_INCREF(ptr);
PUSH(ptr);
DISPATCH();
}
}
name = GETITEM(names, oparg);
v = _PyDict_LoadGlobal((PyDictObject *)f->f_globals,
(PyDictObject *)f->f_builtins,
name);
if (v == NULL) {
if (!_PyErr_OCCURRED()) {
/* _PyDict_LoadGlobal() returns NULL without raising
* an exception if the key doesn't exist */
format_exc_check_arg(tstate, PyExc_NameError,
NAME_ERROR_MSG, name);
}
goto error;
}
if (co_opcache != NULL) {
_PyOpcache_LoadGlobal *lg = &co_opcache->u.lg;
if (co_opcache->optimized == 0) {
/* Wasn't optimized before. */
OPCACHE_STAT_GLOBAL_OPT();
} else {
OPCACHE_STAT_GLOBAL_MISS();
}
co_opcache->optimized = 1;
lg->globals_ver =
((PyDictObject *)f->f_globals)->ma_version_tag;
lg->builtins_ver =
((PyDictObject *)f->f_builtins)->ma_version_tag;
lg->ptr = v; /* borrowed */
}
Py_INCREF(v);
}
else {
/* Slow-path if globals or builtins is not a dict */
/* namespace 1: globals */
name = GETITEM(names, oparg);
v = PyObject_GetItem(f->f_globals, name);
if (v == NULL) {
if (!_PyErr_ExceptionMatches(tstate, PyExc_KeyError)) {
goto error;
}
_PyErr_Clear(tstate);
/* namespace 2: builtins */
v = PyObject_GetItem(f->f_builtins, name);
if (v == NULL) {
if (_PyErr_ExceptionMatches(tstate, PyExc_KeyError)) {
format_exc_check_arg(
tstate, PyExc_NameError,
NAME_ERROR_MSG, name);
}
goto error;
}
}
}
PUSH(v);
DISPATCH();
}
case TARGET(DELETE_FAST): {
PyObject *v = GETLOCAL(oparg);
if (v != NULL) {
SETLOCAL(oparg, NULL);
DISPATCH();
}
format_exc_check_arg(
tstate, PyExc_UnboundLocalError,
UNBOUNDLOCAL_ERROR_MSG,
PyTuple_GetItem(co->co_varnames, oparg)
);
goto error;
}
case TARGET(DELETE_DEREF): {
PyObject *cell = freevars[oparg];
PyObject *oldobj = PyCell_GET(cell);
if (oldobj != NULL) {
PyCell_SET(cell, NULL);
Py_DECREF(oldobj);
DISPATCH();
}
format_exc_unbound(tstate, co, oparg);
goto error;
}
case TARGET(LOAD_CLOSURE): {
PyObject *cell = freevars[oparg];
Py_INCREF(cell);
PUSH(cell);
DISPATCH();
}
case TARGET(LOAD_CLASSDEREF): {
PyObject *name, *value, *locals = f->f_locals;
Py_ssize_t idx;
assert(locals);
assert(oparg >= PyTuple_GET_SIZE(co->co_cellvars));
idx = oparg - PyTuple_GET_SIZE(co->co_cellvars);
assert(idx >= 0 && idx < PyTuple_GET_SIZE(co->co_freevars));
name = PyTuple_GET_ITEM(co->co_freevars, idx);
if (PyDict_CheckExact(locals)) {
value = PyDict_GetItemWithError(locals, name);
if (value != NULL) {
Py_INCREF(value);
}
else if (_PyErr_Occurred(tstate)) {
goto error;
}
}
else {
value = PyObject_GetItem(locals, name);
if (value == NULL) {
if (!_PyErr_ExceptionMatches(tstate, PyExc_KeyError)) {
goto error;
}
_PyErr_Clear(tstate);
}
}
if (!value) {
PyObject *cell = freevars[oparg];
value = PyCell_GET(cell);
if (value == NULL) {
format_exc_unbound(tstate, co, oparg);
goto error;
}
Py_INCREF(value);
}
PUSH(value);
DISPATCH();
}
case TARGET(LOAD_DEREF): {
PyObject *cell = freevars[oparg];
PyObject *value = PyCell_GET(cell);
if (value == NULL) {
format_exc_unbound(tstate, co, oparg);
goto error;
}
Py_INCREF(value);
PUSH(value);
DISPATCH();
}
case TARGET(STORE_DEREF): {
PyObject *v = POP();
PyObject *cell = freevars[oparg];
PyObject *oldobj = PyCell_GET(cell);
PyCell_SET(cell, v);
Py_XDECREF(oldobj);
DISPATCH();
}
case TARGET(BUILD_STRING): {
PyObject *str;
PyObject *empty = PyUnicode_New(0, 0);
if (empty == NULL) {
goto error;
}
str = _PyUnicode_JoinArray(empty, stack_pointer - oparg, oparg);
Py_DECREF(empty);
if (str == NULL)
goto error;
while (--oparg >= 0) {
PyObject *item = POP();
Py_DECREF(item);
}
PUSH(str);
DISPATCH();
}
case TARGET(BUILD_TUPLE): {
PyObject *tup = PyTuple_New(oparg);
if (tup == NULL)
goto error;
while (--oparg >= 0) {
PyObject *item = POP();
PyTuple_SET_ITEM(tup, oparg, item);
}
PUSH(tup);
DISPATCH();
}
case TARGET(BUILD_LIST): {
PyObject *list = PyList_New(oparg);
if (list == NULL)
goto error;
while (--oparg >= 0) {
PyObject *item = POP();
PyList_SET_ITEM(list, oparg, item);
}
PUSH(list);
DISPATCH();
}
case TARGET(BUILD_TUPLE_UNPACK_WITH_CALL):
case TARGET(BUILD_TUPLE_UNPACK):
case TARGET(BUILD_LIST_UNPACK): {
int convert_to_tuple = opcode != BUILD_LIST_UNPACK;
Py_ssize_t i;
PyObject *sum = PyList_New(0);
PyObject *return_value;
if (sum == NULL)
goto error;
for (i = oparg; i > 0; i--) {
PyObject *none_val;
none_val = _PyList_Extend((PyListObject *)sum, PEEK(i));
if (none_val == NULL) {
if (opcode == BUILD_TUPLE_UNPACK_WITH_CALL &&
_PyErr_ExceptionMatches(tstate, PyExc_TypeError))
{
check_args_iterable(tstate, PEEK(1 + oparg), PEEK(i));
}
Py_DECREF(sum);
goto error;
}
Py_DECREF(none_val);
}
if (convert_to_tuple) {
return_value = PyList_AsTuple(sum);
Py_DECREF(sum);
if (return_value == NULL)
goto error;
}
else {
return_value = sum;
}
while (oparg--)
Py_DECREF(POP());
PUSH(return_value);
DISPATCH();
}
case TARGET(BUILD_SET): {
PyObject *set = PySet_New(NULL);
int err = 0;
int i;
if (set == NULL)
goto error;
for (i = oparg; i > 0; i--) {
PyObject *item = PEEK(i);
if (err == 0)
err = PySet_Add(set, item);
Py_DECREF(item);
}
STACK_SHRINK(oparg);
if (err != 0) {
Py_DECREF(set);
goto error;
}
PUSH(set);
DISPATCH();
}
case TARGET(BUILD_SET_UNPACK): {
Py_ssize_t i;
PyObject *sum = PySet_New(NULL);
if (sum == NULL)
goto error;
for (i = oparg; i > 0; i--) {
if (_PySet_Update(sum, PEEK(i)) < 0) {
Py_DECREF(sum);
goto error;
}
}
while (oparg--)
Py_DECREF(POP());
PUSH(sum);
DISPATCH();
}
case TARGET(BUILD_MAP): {
Py_ssize_t i;
PyObject *map = _PyDict_NewPresized((Py_ssize_t)oparg);
if (map == NULL)
goto error;
for (i = oparg; i > 0; i--) {
int err;
PyObject *key = PEEK(2*i);
PyObject *value = PEEK(2*i - 1);
err = PyDict_SetItem(map, key, value);
if (err != 0) {
Py_DECREF(map);
goto error;
}
}
while (oparg--) {
Py_DECREF(POP());
Py_DECREF(POP());
}
PUSH(map);
DISPATCH();
}
case TARGET(SETUP_ANNOTATIONS): {
_Py_IDENTIFIER(__annotations__);
int err;
PyObject *ann_dict;
if (f->f_locals == NULL) {
_PyErr_Format(tstate, PyExc_SystemError,
"no locals found when setting up annotations");
goto error;
}
/* check if __annotations__ in locals()... */
if (PyDict_CheckExact(f->f_locals)) {
ann_dict = _PyDict_GetItemIdWithError(f->f_locals,
&PyId___annotations__);
if (ann_dict == NULL) {
if (_PyErr_Occurred(tstate)) {
goto error;
}
/* ...if not, create a new one */
ann_dict = PyDict_New();
if (ann_dict == NULL) {
goto error;
}
err = _PyDict_SetItemId(f->f_locals,
&PyId___annotations__, ann_dict);
Py_DECREF(ann_dict);
if (err != 0) {
goto error;
}
}
}
else {
/* do the same if locals() is not a dict */
PyObject *ann_str = _PyUnicode_FromId(&PyId___annotations__);
if (ann_str == NULL) {
goto error;
}
ann_dict = PyObject_GetItem(f->f_locals, ann_str);
if (ann_dict == NULL) {
if (!_PyErr_ExceptionMatches(tstate, PyExc_KeyError)) {
goto error;
}
_PyErr_Clear(tstate);
ann_dict = PyDict_New();
if (ann_dict == NULL) {
goto error;
}
err = PyObject_SetItem(f->f_locals, ann_str, ann_dict);
Py_DECREF(ann_dict);
if (err != 0) {
goto error;
}
}
else {
Py_DECREF(ann_dict);
}
}
DISPATCH();
}
case TARGET(BUILD_CONST_KEY_MAP): {
Py_ssize_t i;
PyObject *map;
PyObject *keys = TOP();
if (!PyTuple_CheckExact(keys) ||
PyTuple_GET_SIZE(keys) != (Py_ssize_t)oparg) {
_PyErr_SetString(tstate, PyExc_SystemError,
"bad BUILD_CONST_KEY_MAP keys argument");
goto error;
}
map = _PyDict_NewPresized((Py_ssize_t)oparg);
if (map == NULL) {
goto error;
}
for (i = oparg; i > 0; i--) {
int err;
PyObject *key = PyTuple_GET_ITEM(keys, oparg - i);
PyObject *value = PEEK(i + 1);
err = PyDict_SetItem(map, key, value);
if (err != 0) {
Py_DECREF(map);
goto error;
}
}
Py_DECREF(POP());
while (oparg--) {
Py_DECREF(POP());
}
PUSH(map);
DISPATCH();
}
case TARGET(BUILD_MAP_UNPACK): {
Py_ssize_t i;
PyObject *sum = PyDict_New();
if (sum == NULL)
goto error;
for (i = oparg; i > 0; i--) {
PyObject *arg = PEEK(i);
if (PyDict_Update(sum, arg) < 0) {
if (_PyErr_ExceptionMatches(tstate, PyExc_AttributeError)) {
_PyErr_Format(tstate, PyExc_TypeError,
"'%.200s' object is not a mapping",
arg->ob_type->tp_name);
}
Py_DECREF(sum);
goto error;
}
}
while (oparg--)
Py_DECREF(POP());
PUSH(sum);
DISPATCH();
}
case TARGET(BUILD_MAP_UNPACK_WITH_CALL): {
Py_ssize_t i;
PyObject *sum = PyDict_New();
if (sum == NULL)
goto error;
for (i = oparg; i > 0; i--) {
PyObject *arg = PEEK(i);
if (_PyDict_MergeEx(sum, arg, 2) < 0) {
Py_DECREF(sum);
format_kwargs_error(tstate, PEEK(2 + oparg), arg);
goto error;
}
}
while (oparg--)
Py_DECREF(POP());
PUSH(sum);
DISPATCH();
}
case TARGET(MAP_ADD): {
PyObject *value = TOP();
PyObject *key = SECOND();
PyObject *map;
int err;
STACK_SHRINK(2);
map = PEEK(oparg); /* dict */
assert(PyDict_CheckExact(map));
err = PyDict_SetItem(map, key, value); /* map[key] = value */
Py_DECREF(value);
Py_DECREF(key);
if (err != 0)
goto error;
PREDICT(JUMP_ABSOLUTE);
DISPATCH();
}
case TARGET(LOAD_ATTR): {
PyObject *name = GETITEM(names, oparg);
PyObject *owner = TOP();
PyObject *res = PyObject_GetAttr(owner, name);
Py_DECREF(owner);
SET_TOP(res);
if (res == NULL)
goto error;
DISPATCH();
}
case TARGET(COMPARE_OP): {
PyObject *right = POP();
PyObject *left = TOP();
PyObject *res = cmp_outcome(tstate, oparg, left, right);
Py_DECREF(left);
Py_DECREF(right);
SET_TOP(res);
if (res == NULL)
goto error;
PREDICT(POP_JUMP_IF_FALSE);
PREDICT(POP_JUMP_IF_TRUE);
DISPATCH();
}
case TARGET(IMPORT_NAME): {
PyObject *name = GETITEM(names, oparg);
PyObject *fromlist = POP();
PyObject *level = TOP();
PyObject *res;
res = import_name(tstate, f, name, fromlist, level);
Py_DECREF(level);
Py_DECREF(fromlist);
SET_TOP(res);
if (res == NULL)
goto error;
DISPATCH();
}
case TARGET(IMPORT_STAR): {
PyObject *from = POP(), *locals;
int err;
if (PyFrame_FastToLocalsWithError(f) < 0) {
Py_DECREF(from);
goto error;
}
locals = f->f_locals;
if (locals == NULL) {
_PyErr_SetString(tstate, PyExc_SystemError,
"no locals found during 'import *'");
Py_DECREF(from);
goto error;
}
err = import_all_from(tstate, locals, from);
PyFrame_LocalsToFast(f, 0);
Py_DECREF(from);
if (err != 0)
goto error;
DISPATCH();
}
case TARGET(IMPORT_FROM): {
PyObject *name = GETITEM(names, oparg);
PyObject *from = TOP();
PyObject *res;
res = import_from(tstate, from, name);
PUSH(res);
if (res == NULL)
goto error;
DISPATCH();
}
case TARGET(JUMP_FORWARD): {
JUMPBY(oparg);
FAST_DISPATCH();
}
case TARGET(POP_JUMP_IF_FALSE): {
PREDICTED(POP_JUMP_IF_FALSE);
PyObject *cond = POP();
int err;
if (cond == Py_True) {
Py_DECREF(cond);
FAST_DISPATCH();
}
if (cond == Py_False) {
Py_DECREF(cond);
JUMPTO(oparg);
FAST_DISPATCH();
}
err = PyObject_IsTrue(cond);
Py_DECREF(cond);
if (err > 0)
;
else if (err == 0)
JUMPTO(oparg);
else
goto error;
DISPATCH();
}
case TARGET(POP_JUMP_IF_TRUE): {
PREDICTED(POP_JUMP_IF_TRUE);
PyObject *cond = POP();
int err;
if (cond == Py_False) {
Py_DECREF(cond);
FAST_DISPATCH();
}
if (cond == Py_True) {
Py_DECREF(cond);
JUMPTO(oparg);
FAST_DISPATCH();
}
err = PyObject_IsTrue(cond);
Py_DECREF(cond);
if (err > 0) {
JUMPTO(oparg);
}
else if (err == 0)
;
else
goto error;
DISPATCH();
}
case TARGET(JUMP_IF_FALSE_OR_POP): {
PyObject *cond = TOP();
int err;
if (cond == Py_True) {
STACK_SHRINK(1);
Py_DECREF(cond);
FAST_DISPATCH();
}
if (cond == Py_False) {
JUMPTO(oparg);
FAST_DISPATCH();
}
err = PyObject_IsTrue(cond);
if (err > 0) {
STACK_SHRINK(1);
Py_DECREF(cond);
}
else if (err == 0)
JUMPTO(oparg);
else
goto error;
DISPATCH();
}
case TARGET(JUMP_IF_TRUE_OR_POP): {
PyObject *cond = TOP();
int err;
if (cond == Py_False) {
STACK_SHRINK(1);
Py_DECREF(cond);
FAST_DISPATCH();
}
if (cond == Py_True) {
JUMPTO(oparg);
FAST_DISPATCH();
}
err = PyObject_IsTrue(cond);
if (err > 0) {
JUMPTO(oparg);
}
else if (err == 0) {
STACK_SHRINK(1);
Py_DECREF(cond);
}
else
goto error;
DISPATCH();
}
case TARGET(JUMP_ABSOLUTE): {
PREDICTED(JUMP_ABSOLUTE);
JUMPTO(oparg);
#if FAST_LOOPS
/* Enabling this path speeds-up all while and for-loops by bypassing
the per-loop checks for signals. By default, this should be turned-off
because it prevents detection of a control-break in tight loops like
"while 1: pass". Compile with this option turned-on when you need
the speed-up and do not need break checking inside tight loops (ones
that contain only instructions ending with FAST_DISPATCH).
*/
FAST_DISPATCH();
#else
DISPATCH();
#endif
}
case TARGET(GET_ITER): {
/* before: [obj]; after [getiter(obj)] */
PyObject *iterable = TOP();
PyObject *iter = PyObject_GetIter(iterable);
Py_DECREF(iterable);
SET_TOP(iter);
if (iter == NULL)
goto error;
PREDICT(FOR_ITER);
PREDICT(CALL_FUNCTION);
DISPATCH();
}
case TARGET(GET_YIELD_FROM_ITER): {
/* before: [obj]; after [getiter(obj)] */
PyObject *iterable = TOP();
PyObject *iter;
if (PyCoro_CheckExact(iterable)) {
/* `iterable` is a coroutine */
if (!(co->co_flags & (CO_COROUTINE | CO_ITERABLE_COROUTINE))) {
/* and it is used in a 'yield from' expression of a
regular generator. */
Py_DECREF(iterable);
SET_TOP(NULL);
_PyErr_SetString(tstate, PyExc_TypeError,
"cannot 'yield from' a coroutine object "
"in a non-coroutine generator");
goto error;
}
}
else if (!PyGen_CheckExact(iterable)) {
/* `iterable` is not a generator. */
iter = PyObject_GetIter(iterable);
Py_DECREF(iterable);
SET_TOP(iter);
if (iter == NULL)
goto error;
}
PREDICT(LOAD_CONST);
DISPATCH();
}
case TARGET(FOR_ITER): {
PREDICTED(FOR_ITER);
/* before: [iter]; after: [iter, iter()] *or* [] */
PyObject *iter = TOP();
PyObject *next = (*iter->ob_type->tp_iternext)(iter);
if (next != NULL) {
PUSH(next);
PREDICT(STORE_FAST);
PREDICT(UNPACK_SEQUENCE);
DISPATCH();
}
if (_PyErr_Occurred(tstate)) {
if (!_PyErr_ExceptionMatches(tstate, PyExc_StopIteration)) {
goto error;
}
else if (tstate->c_tracefunc != NULL) {
call_exc_trace(tstate->c_tracefunc, tstate->c_traceobj, tstate, f);
}
_PyErr_Clear(tstate);
}
/* iterator ended normally */
STACK_SHRINK(1);
Py_DECREF(iter);
JUMPBY(oparg);
PREDICT(POP_BLOCK);
DISPATCH();
}
case TARGET(SETUP_FINALLY): {
/* NOTE: If you add any new block-setup opcodes that
are not try/except/finally handlers, you may need
to update the PyGen_NeedsFinalizing() function.
*/
PyFrame_BlockSetup(f, SETUP_FINALLY, INSTR_OFFSET() + oparg,
STACK_LEVEL());
DISPATCH();
}
case TARGET(BEFORE_ASYNC_WITH): {
_Py_IDENTIFIER(__aexit__);
_Py_IDENTIFIER(__aenter__);
PyObject *mgr = TOP();
PyObject *exit = special_lookup(tstate, mgr, &PyId___aexit__),
*enter;
PyObject *res;
if (exit == NULL)
goto error;
SET_TOP(exit);
enter = special_lookup(tstate, mgr, &PyId___aenter__);
Py_DECREF(mgr);
if (enter == NULL)
goto error;
res = _PyObject_CallNoArg(enter);
Py_DECREF(enter);
if (res == NULL)
goto error;
PUSH(res);
PREDICT(GET_AWAITABLE);
DISPATCH();
}
case TARGET(SETUP_ASYNC_WITH): {
PyObject *res = POP();
/* Setup the finally block before pushing the result
of __aenter__ on the stack. */
PyFrame_BlockSetup(f, SETUP_FINALLY, INSTR_OFFSET() + oparg,
STACK_LEVEL());
PUSH(res);
DISPATCH();
}
case TARGET(SETUP_WITH): {
_Py_IDENTIFIER(__exit__);
_Py_IDENTIFIER(__enter__);
PyObject *mgr = TOP();
PyObject *enter = special_lookup(tstate, mgr, &PyId___enter__);
PyObject *res;
if (enter == NULL) {
goto error;
}
PyObject *exit = special_lookup(tstate, mgr, &PyId___exit__);
if (exit == NULL) {
Py_DECREF(enter);
goto error;
}
SET_TOP(exit);
Py_DECREF(mgr);
res = _PyObject_CallNoArg(enter);
Py_DECREF(enter);
if (res == NULL)
goto error;
/* Setup the finally block before pushing the result
of __enter__ on the stack. */
PyFrame_BlockSetup(f, SETUP_FINALLY, INSTR_OFFSET() + oparg,
STACK_LEVEL());
PUSH(res);
DISPATCH();
}
case TARGET(WITH_CLEANUP_START): {
/* At the top of the stack are 1 or 6 values indicating
how/why we entered the finally clause:
- TOP = NULL
- (TOP, SECOND, THIRD) = exc_info()
(FOURTH, FITH, SIXTH) = previous exception for EXCEPT_HANDLER
Below them is EXIT, the context.__exit__ or context.__aexit__
bound method.
In the first case, we must call
EXIT(None, None, None)
otherwise we must call
EXIT(TOP, SECOND, THIRD)
In the first case, we remove EXIT from the
stack, leaving TOP, and push TOP on the stack.
Otherwise we shift the bottom 3 values of the
stack down, replace the empty spot with NULL, and push
None on the stack.
Finally we push the result of the call.
*/
PyObject *stack[3];
PyObject *exit_func;
PyObject *exc, *val, *tb, *res;
val = tb = Py_None;
exc = TOP();
if (exc == NULL) {
STACK_SHRINK(1);
exit_func = TOP();
SET_TOP(exc);
exc = Py_None;
}
else {
assert(PyExceptionClass_Check(exc));
PyObject *tp2, *exc2, *tb2;
PyTryBlock *block;
val = SECOND();
tb = THIRD();
tp2 = FOURTH();
exc2 = PEEK(5);
tb2 = PEEK(6);
exit_func = PEEK(7);
SET_VALUE(7, tb2);
SET_VALUE(6, exc2);
SET_VALUE(5, tp2);
/* UNWIND_EXCEPT_HANDLER will pop this off. */
SET_FOURTH(NULL);
/* We just shifted the stack down, so we have
to tell the except handler block that the
values are lower than it expects. */
assert(f->f_iblock > 0);
block = &f->f_blockstack[f->f_iblock - 1];
assert(block->b_type == EXCEPT_HANDLER);
assert(block->b_level > 0);
block->b_level--;
}
stack[0] = exc;
stack[1] = val;
stack[2] = tb;
res = _PyObject_FastCall(exit_func, stack, 3);
Py_DECREF(exit_func);
if (res == NULL)
goto error;
Py_INCREF(exc); /* Duplicating the exception on the stack */
PUSH(exc);
PUSH(res);
PREDICT(WITH_CLEANUP_FINISH);
DISPATCH();
}
case TARGET(WITH_CLEANUP_FINISH): {
PREDICTED(WITH_CLEANUP_FINISH);
/* TOP = the result of calling the context.__exit__ bound method
SECOND = either None or exception type
If SECOND is None below is NULL or the return address,
otherwise below are 7 values representing an exception.
*/
PyObject *res = POP();
PyObject *exc = POP();
int err;
if (exc != Py_None)
err = PyObject_IsTrue(res);
else
err = 0;
Py_DECREF(res);
Py_DECREF(exc);
if (err < 0)
goto error;
else if (err > 0) {
/* There was an exception and a True return.
* We must manually unwind the EXCEPT_HANDLER block
* which was created when the exception was caught,
* otherwise the stack will be in an inconsistent state.
*/
PyTryBlock *b = PyFrame_BlockPop(f);
assert(b->b_type == EXCEPT_HANDLER);
UNWIND_EXCEPT_HANDLER(b);
PUSH(NULL);
}
PREDICT(END_FINALLY);
DISPATCH();
}
case TARGET(LOAD_METHOD): {
/* Designed to work in tandem with CALL_METHOD. */
PyObject *name = GETITEM(names, oparg);
PyObject *obj = TOP();
PyObject *meth = NULL;
int meth_found = _PyObject_GetMethod(obj, name, &meth);
if (meth == NULL) {
/* Most likely attribute wasn't found. */
goto error;
}
if (meth_found) {
/* We can bypass temporary bound method object.
meth is unbound method and obj is self.
meth | self | arg1 | ... | argN
*/
SET_TOP(meth);
PUSH(obj); // self
}
else {
/* meth is not an unbound method (but a regular attr, or
something was returned by a descriptor protocol). Set
the second element of the stack to NULL, to signal
CALL_METHOD that it's not a method call.
NULL | meth | arg1 | ... | argN
*/
SET_TOP(NULL);
Py_DECREF(obj);
PUSH(meth);
}
DISPATCH();
}
case TARGET(CALL_METHOD): {
/* Designed to work in tamdem with LOAD_METHOD. */
PyObject **sp, *res, *meth;
sp = stack_pointer;
meth = PEEK(oparg + 2);
if (meth == NULL) {
/* `meth` is NULL when LOAD_METHOD thinks that it's not
a method call.
Stack layout:
... | NULL | callable | arg1 | ... | argN
^- TOP()
^- (-oparg)
^- (-oparg-1)
^- (-oparg-2)
`callable` will be POPed by call_function.
NULL will will be POPed manually later.
*/
res = call_function(tstate, &sp, oparg, NULL);
stack_pointer = sp;
(void)POP(); /* POP the NULL. */
}
else {
/* This is a method call. Stack layout:
... | method | self | arg1 | ... | argN
^- TOP()
^- (-oparg)
^- (-oparg-1)
^- (-oparg-2)
`self` and `method` will be POPed by call_function.
We'll be passing `oparg + 1` to call_function, to
make it accept the `self` as a first argument.
*/
res = call_function(tstate, &sp, oparg + 1, NULL);
stack_pointer = sp;
}
PUSH(res);
if (res == NULL)
goto error;
DISPATCH();
}
case TARGET(CALL_FUNCTION): {
PREDICTED(CALL_FUNCTION);
PyObject **sp, *res;
sp = stack_pointer;
res = call_function(tstate, &sp, oparg, NULL);
stack_pointer = sp;
PUSH(res);
if (res == NULL) {
goto error;
}
DISPATCH();
}
case TARGET(CALL_FUNCTION_KW): {
PyObject **sp, *res, *names;
names = POP();
assert(PyTuple_CheckExact(names) && PyTuple_GET_SIZE(names) <= oparg);
sp = stack_pointer;
res = call_function(tstate, &sp, oparg, names);
stack_pointer = sp;
PUSH(res);
Py_DECREF(names);
if (res == NULL) {
goto error;
}
DISPATCH();
}
case TARGET(CALL_FUNCTION_EX): {
PyObject *func, *callargs, *kwargs = NULL, *result;
if (oparg & 0x01) {
kwargs = POP();
if (!PyDict_CheckExact(kwargs)) {
PyObject *d = PyDict_New();
if (d == NULL)
goto error;
if (_PyDict_MergeEx(d, kwargs, 2) < 0) {
Py_DECREF(d);
format_kwargs_error(tstate, SECOND(), kwargs);
Py_DECREF(kwargs);
goto error;
}
Py_DECREF(kwargs);
kwargs = d;
}
assert(PyDict_CheckExact(kwargs));
}
callargs = POP();
func = TOP();
if (!PyTuple_CheckExact(callargs)) {
if (check_args_iterable(tstate, func, callargs) < 0) {
Py_DECREF(callargs);
goto error;
}
Py_SETREF(callargs, PySequence_Tuple(callargs));
if (callargs == NULL) {
goto error;
}
}
assert(PyTuple_CheckExact(callargs));
result = do_call_core(tstate, func, callargs, kwargs);
Py_DECREF(func);
Py_DECREF(callargs);
Py_XDECREF(kwargs);
SET_TOP(result);
if (result == NULL) {
goto error;
}
DISPATCH();
}
case TARGET(MAKE_FUNCTION): {
PyObject *qualname = POP();
PyObject *codeobj = POP();
PyFunctionObject *func = (PyFunctionObject *)
PyFunction_NewWithQualName(codeobj, f->f_globals, qualname);
Py_DECREF(codeobj);
Py_DECREF(qualname);
if (func == NULL) {
goto error;
}
if (oparg & 0x08) {
assert(PyTuple_CheckExact(TOP()));
func ->func_closure = POP();
}
if (oparg & 0x04) {
assert(PyDict_CheckExact(TOP()));
func->func_annotations = POP();
}
if (oparg & 0x02) {
assert(PyDict_CheckExact(TOP()));
func->func_kwdefaults = POP();
}
if (oparg & 0x01) {
assert(PyTuple_CheckExact(TOP()));
func->func_defaults = POP();
}
PUSH((PyObject *)func);
DISPATCH();
}
case TARGET(BUILD_SLICE): {
PyObject *start, *stop, *step, *slice;
if (oparg == 3)
step = POP();
else
step = NULL;
stop = POP();
start = TOP();
slice = PySlice_New(start, stop, step);
Py_DECREF(start);
Py_DECREF(stop);
Py_XDECREF(step);
SET_TOP(slice);
if (slice == NULL)
goto error;
DISPATCH();
}
case TARGET(FORMAT_VALUE): {
/* Handles f-string value formatting. */
PyObject *result;
PyObject *fmt_spec;
PyObject *value;
PyObject *(*conv_fn)(PyObject *);
int which_conversion = oparg & FVC_MASK;
int have_fmt_spec = (oparg & FVS_MASK) == FVS_HAVE_SPEC;
fmt_spec = have_fmt_spec ? POP() : NULL;
value = POP();
/* See if any conversion is specified. */
switch (which_conversion) {
case FVC_NONE: conv_fn = NULL; break;
case FVC_STR: conv_fn = PyObject_Str; break;
case FVC_REPR: conv_fn = PyObject_Repr; break;
case FVC_ASCII: conv_fn = PyObject_ASCII; break;
default:
_PyErr_Format(tstate, PyExc_SystemError,
"unexpected conversion flag %d",
which_conversion);
goto error;
}
/* If there's a conversion function, call it and replace
value with that result. Otherwise, just use value,
without conversion. */
if (conv_fn != NULL) {
result = conv_fn(value);
Py_DECREF(value);
if (result == NULL) {
Py_XDECREF(fmt_spec);
goto error;
}
value = result;
}
/* If value is a unicode object, and there's no fmt_spec,
then we know the result of format(value) is value
itself. In that case, skip calling format(). I plan to
move this optimization in to PyObject_Format()
itself. */
if (PyUnicode_CheckExact(value) && fmt_spec == NULL) {
/* Do nothing, just transfer ownership to result. */
result = value;
} else {
/* Actually call format(). */
result = PyObject_Format(value, fmt_spec);
Py_DECREF(value);
Py_XDECREF(fmt_spec);
if (result == NULL) {
goto error;
}
}
PUSH(result);
DISPATCH();
}
case TARGET(EXTENDED_ARG): {
int oldoparg = oparg;
NEXTOPARG();
oparg |= oldoparg << 8;
goto dispatch_opcode;
}
#if USE_COMPUTED_GOTOS
_unknown_opcode:
#endif
default:
fprintf(stderr,
"XXX lineno: %d, opcode: %d\n",
PyFrame_GetLineNumber(f),
opcode);
_PyErr_SetString(tstate, PyExc_SystemError, "unknown opcode");
goto error;
} /* switch */
/* This should never be reached. Every opcode should end with DISPATCH()
or goto error. */
Py_UNREACHABLE();
error:
/* Double-check exception status. */
#ifdef NDEBUG
if (!_PyErr_Occurred(tstate)) {
_PyErr_SetString(tstate, PyExc_SystemError,
"error return without exception set");
}
#else
assert(_PyErr_Occurred(tstate));
#endif
/* Log traceback info. */
PyTraceBack_Here(f);
if (tstate->c_tracefunc != NULL)
call_exc_trace(tstate->c_tracefunc, tstate->c_traceobj,
tstate, f);
exception_unwind:
/* Unwind stacks if an exception occurred */
while (f->f_iblock > 0) {
/* Pop the current block. */
PyTryBlock *b = &f->f_blockstack[--f->f_iblock];
if (b->b_type == EXCEPT_HANDLER) {
UNWIND_EXCEPT_HANDLER(b);
continue;
}
UNWIND_BLOCK(b);
if (b->b_type == SETUP_FINALLY) {
PyObject *exc, *val, *tb;
int handler = b->b_handler;
_PyErr_StackItem *exc_info = tstate->exc_info;
/* Beware, this invalidates all b->b_* fields */
PyFrame_BlockSetup(f, EXCEPT_HANDLER, -1, STACK_LEVEL());
PUSH(exc_info->exc_traceback);
PUSH(exc_info->exc_value);
if (exc_info->exc_type != NULL) {
PUSH(exc_info->exc_type);
}
else {
Py_INCREF(Py_None);
PUSH(Py_None);
}
_PyErr_Fetch(tstate, &exc, &val, &tb);
/* Make the raw exception data
available to the handler,
so a program can emulate the
Python main loop. */
_PyErr_NormalizeException(tstate, &exc, &val, &tb);
if (tb != NULL)
PyException_SetTraceback(val, tb);
else
PyException_SetTraceback(val, Py_None);
Py_INCREF(exc);
exc_info->exc_type = exc;
Py_INCREF(val);
exc_info->exc_value = val;
exc_info->exc_traceback = tb;
if (tb == NULL)
tb = Py_None;
Py_INCREF(tb);
PUSH(tb);
PUSH(val);
PUSH(exc);
JUMPTO(handler);
/* Resume normal execution */
goto main_loop;
}
} /* unwind stack */
/* End the loop as we still have an error */
break;
} /* main loop */
assert(retval == NULL);
assert(_PyErr_Occurred(tstate));
exit_returning:
/* Pop remaining stack entries. */
while (!EMPTY()) {
PyObject *o = POP();
Py_XDECREF(o);
}
exit_yielding:
if (tstate->use_tracing) {
if (tstate->c_tracefunc) {
if (call_trace_protected(tstate->c_tracefunc, tstate->c_traceobj,
tstate, f, PyTrace_RETURN, retval)) {
Py_CLEAR(retval);
}
}
if (tstate->c_profilefunc) {
if (call_trace_protected(tstate->c_profilefunc, tstate->c_profileobj,
tstate, f, PyTrace_RETURN, retval)) {
Py_CLEAR(retval);
}
}
}
/* pop frame */
exit_eval_frame:
if (PyDTrace_FUNCTION_RETURN_ENABLED())
dtrace_function_return(f);
Py_LeaveRecursiveCall();
f->f_executing = 0;
tstate->frame = f->f_back;
return _Py_CheckFunctionResult(NULL, retval, "PyEval_EvalFrameEx");
}
static void
format_missing(PyThreadState *tstate, const char *kind,
PyCodeObject *co, PyObject *names)
{
int err;
Py_ssize_t len = PyList_GET_SIZE(names);
PyObject *name_str, *comma, *tail, *tmp;
assert(PyList_CheckExact(names));
assert(len >= 1);
/* Deal with the joys of natural language. */
switch (len) {
case 1:
name_str = PyList_GET_ITEM(names, 0);
Py_INCREF(name_str);
break;
case 2:
name_str = PyUnicode_FromFormat("%U and %U",
PyList_GET_ITEM(names, len - 2),
PyList_GET_ITEM(names, len - 1));
break;
default:
tail = PyUnicode_FromFormat(", %U, and %U",
PyList_GET_ITEM(names, len - 2),
PyList_GET_ITEM(names, len - 1));
if (tail == NULL)
return;
/* Chop off the last two objects in the list. This shouldn't actually
fail, but we can't be too careful. */
err = PyList_SetSlice(names, len - 2, len, NULL);
if (err == -1) {
Py_DECREF(tail);
return;
}
/* Stitch everything up into a nice comma-separated list. */
comma = PyUnicode_FromString(", ");
if (comma == NULL) {
Py_DECREF(tail);
return;
}
tmp = PyUnicode_Join(comma, names);
Py_DECREF(comma);
if (tmp == NULL) {
Py_DECREF(tail);
return;
}
name_str = PyUnicode_Concat(tmp, tail);
Py_DECREF(tmp);
Py_DECREF(tail);
break;
}
if (name_str == NULL)
return;
_PyErr_Format(tstate, PyExc_TypeError,
"%U() missing %i required %s argument%s: %U",
co->co_name,
len,
kind,
len == 1 ? "" : "s",
name_str);
Py_DECREF(name_str);
}
static void
missing_arguments(PyThreadState *tstate, PyCodeObject *co,
Py_ssize_t missing, Py_ssize_t defcount,
PyObject **fastlocals)
{
Py_ssize_t i, j = 0;
Py_ssize_t start, end;
int positional = (defcount != -1);
const char *kind = positional ? "positional" : "keyword-only";
PyObject *missing_names;
/* Compute the names of the arguments that are missing. */
missing_names = PyList_New(missing);
if (missing_names == NULL)
return;
if (positional) {
start = 0;
end = co->co_argcount - defcount;
}
else {
start = co->co_argcount;
end = start + co->co_kwonlyargcount;
}
for (i = start; i < end; i++) {
if (GETLOCAL(i) == NULL) {
PyObject *raw = PyTuple_GET_ITEM(co->co_varnames, i);
PyObject *name = PyObject_Repr(raw);
if (name == NULL) {
Py_DECREF(missing_names);
return;
}
PyList_SET_ITEM(missing_names, j++, name);
}
}
assert(j == missing);
format_missing(tstate, kind, co, missing_names);
Py_DECREF(missing_names);
}
static void
too_many_positional(PyThreadState *tstate, PyCodeObject *co,
Py_ssize_t given, Py_ssize_t defcount,
PyObject **fastlocals)
{
int plural;
Py_ssize_t kwonly_given = 0;
Py_ssize_t i;
PyObject *sig, *kwonly_sig;
Py_ssize_t co_argcount = co->co_argcount;
assert((co->co_flags & CO_VARARGS) == 0);
/* Count missing keyword-only args. */
for (i = co_argcount; i < co_argcount + co->co_kwonlyargcount; i++) {
if (GETLOCAL(i) != NULL) {
kwonly_given++;
}
}
if (defcount) {
Py_ssize_t atleast = co_argcount - defcount;
plural = 1;
sig = PyUnicode_FromFormat("from %zd to %zd", atleast, co_argcount);
}
else {
plural = (co_argcount != 1);
sig = PyUnicode_FromFormat("%zd", co_argcount);
}
if (sig == NULL)
return;
if (kwonly_given) {
const char *format = " positional argument%s (and %zd keyword-only argument%s)";
kwonly_sig = PyUnicode_FromFormat(format,
given != 1 ? "s" : "",
kwonly_given,
kwonly_given != 1 ? "s" : "");
if (kwonly_sig == NULL) {
Py_DECREF(sig);
return;
}
}
else {
/* This will not fail. */
kwonly_sig = PyUnicode_FromString("");
assert(kwonly_sig != NULL);
}
_PyErr_Format(tstate, PyExc_TypeError,
"%U() takes %U positional argument%s but %zd%U %s given",
co->co_name,
sig,
plural ? "s" : "",
given,
kwonly_sig,
given == 1 && !kwonly_given ? "was" : "were");
Py_DECREF(sig);
Py_DECREF(kwonly_sig);
}
static int
positional_only_passed_as_keyword(PyThreadState *tstate, PyCodeObject *co,
Py_ssize_t kwcount, PyObject* const* kwnames)
{
int posonly_conflicts = 0;
PyObject* posonly_names = PyList_New(0);
for(int k=0; k < co->co_posonlyargcount; k++){
PyObject* posonly_name = PyTuple_GET_ITEM(co->co_varnames, k);
for (int k2=0; k2<kwcount; k2++){
/* Compare the pointers first and fallback to PyObject_RichCompareBool*/
PyObject* kwname = kwnames[k2];
if (kwname == posonly_name){
if(PyList_Append(posonly_names, kwname) != 0) {
goto fail;
}
posonly_conflicts++;
continue;
}
int cmp = PyObject_RichCompareBool(posonly_name, kwname, Py_EQ);
if ( cmp > 0) {
if(PyList_Append(posonly_names, kwname) != 0) {
goto fail;
}
posonly_conflicts++;
} else if (cmp < 0) {
goto fail;
}
}
}
if (posonly_conflicts) {
PyObject* comma = PyUnicode_FromString(", ");
if (comma == NULL) {
goto fail;
}
PyObject* error_names = PyUnicode_Join(comma, posonly_names);
Py_DECREF(comma);
if (error_names == NULL) {
goto fail;
}
_PyErr_Format(tstate, PyExc_TypeError,
"%U() got some positional-only arguments passed"
" as keyword arguments: '%U'",
co->co_name, error_names);
Py_DECREF(error_names);
goto fail;
}
Py_DECREF(posonly_names);
return 0;
fail:
Py_XDECREF(posonly_names);
return 1;
}
/* This is gonna seem *real weird*, but if you put some other code between
PyEval_EvalFrame() and _PyEval_EvalFrameDefault() you will need to adjust
the test in the if statements in Misc/gdbinit (pystack and pystackv). */
PyObject *
_PyEval_EvalCodeWithName(PyObject *_co, PyObject *globals, PyObject *locals,
PyObject *const *args, Py_ssize_t argcount,
PyObject *const *kwnames, PyObject *const *kwargs,
Py_ssize_t kwcount, int kwstep,
PyObject *const *defs, Py_ssize_t defcount,
PyObject *kwdefs, PyObject *closure,
PyObject *name, PyObject *qualname)
{
PyCodeObject* co = (PyCodeObject*)_co;
PyFrameObject *f;
PyObject *retval = NULL;
PyObject **fastlocals, **freevars;
PyObject *x, *u;
const Py_ssize_t total_args = co->co_argcount + co->co_kwonlyargcount;
Py_ssize_t i, j, n;
PyObject *kwdict;
PyThreadState *tstate = _PyThreadState_GET();
assert(tstate != NULL);
if (globals == NULL) {
_PyErr_SetString(tstate, PyExc_SystemError,
"PyEval_EvalCodeEx: NULL globals");
return NULL;
}
/* Create the frame */
f = _PyFrame_New_NoTrack(tstate, co, globals, locals);
if (f == NULL) {
return NULL;
}
fastlocals = f->f_localsplus;
freevars = f->f_localsplus + co->co_nlocals;
/* Create a dictionary for keyword parameters (**kwags) */
if (co->co_flags & CO_VARKEYWORDS) {
kwdict = PyDict_New();
if (kwdict == NULL)
goto fail;
i = total_args;
if (co->co_flags & CO_VARARGS) {
i++;
}
SETLOCAL(i, kwdict);
}
else {
kwdict = NULL;
}
/* Copy all positional arguments into local variables */
if (argcount > co->co_argcount) {
n = co->co_argcount;
}
else {
n = argcount;
}
for (j = 0; j < n; j++) {
x = args[j];
Py_INCREF(x);
SETLOCAL(j, x);
}
/* Pack other positional arguments into the *args argument */
if (co->co_flags & CO_VARARGS) {
u = _PyTuple_FromArray(args + n, argcount - n);
if (u == NULL) {
goto fail;
}
SETLOCAL(total_args, u);
}
/* Handle keyword arguments passed as two strided arrays */
kwcount *= kwstep;
for (i = 0; i < kwcount; i += kwstep) {
PyObject **co_varnames;
PyObject *keyword = kwnames[i];
PyObject *value = kwargs[i];
Py_ssize_t j;
if (keyword == NULL || !PyUnicode_Check(keyword)) {
_PyErr_Format(tstate, PyExc_TypeError,
"%U() keywords must be strings",
co->co_name);
goto fail;
}
/* Speed hack: do raw pointer compares. As names are
normally interned this should almost always hit. */
co_varnames = ((PyTupleObject *)(co->co_varnames))->ob_item;
for (j = co->co_posonlyargcount; j < total_args; j++) {
PyObject *name = co_varnames[j];
if (name == keyword) {
goto kw_found;
}
}
/* Slow fallback, just in case */
for (j = co->co_posonlyargcount; j < total_args; j++) {
PyObject *name = co_varnames[j];
int cmp = PyObject_RichCompareBool( keyword, name, Py_EQ);
if (cmp > 0) {
goto kw_found;
}
else if (cmp < 0) {
goto fail;
}
}
assert(j >= total_args);
if (kwdict == NULL) {
if (co->co_posonlyargcount
&& positional_only_passed_as_keyword(tstate, co,
kwcount, kwnames))
{
goto fail;
}
_PyErr_Format(tstate, PyExc_TypeError,
"%U() got an unexpected keyword argument '%S'",
co->co_name, keyword);
goto fail;
}
if (PyDict_SetItem(kwdict, keyword, value) == -1) {
goto fail;
}
continue;
kw_found:
if (GETLOCAL(j) != NULL) {
_PyErr_Format(tstate, PyExc_TypeError,
"%U() got multiple values for argument '%S'",
co->co_name, keyword);
goto fail;
}
Py_INCREF(value);
SETLOCAL(j, value);
}
/* Check the number of positional arguments */
if ((argcount > co->co_argcount) && !(co->co_flags & CO_VARARGS)) {
too_many_positional(tstate, co, argcount, defcount, fastlocals);
goto fail;
}
/* Add missing positional arguments (copy default values from defs) */
if (argcount < co->co_argcount) {
Py_ssize_t m = co->co_argcount - defcount;
Py_ssize_t missing = 0;
for (i = argcount; i < m; i++) {
if (GETLOCAL(i) == NULL) {
missing++;
}
}
if (missing) {
missing_arguments(tstate, co, missing, defcount, fastlocals);
goto fail;
}
if (n > m)
i = n - m;
else
i = 0;
for (; i < defcount; i++) {
if (GETLOCAL(m+i) == NULL) {
PyObject *def = defs[i];
Py_INCREF(def);
SETLOCAL(m+i, def);
}
}
}
/* Add missing keyword arguments (copy default values from kwdefs) */
if (co->co_kwonlyargcount > 0) {
Py_ssize_t missing = 0;
for (i = co->co_argcount; i < total_args; i++) {
PyObject *name;
if (GETLOCAL(i) != NULL)
continue;
name = PyTuple_GET_ITEM(co->co_varnames, i);
if (kwdefs != NULL) {
PyObject *def = PyDict_GetItemWithError(kwdefs, name);
if (def) {
Py_INCREF(def);
SETLOCAL(i, def);
continue;
}
else if (_PyErr_Occurred(tstate)) {
goto fail;
}
}
missing++;
}
if (missing) {
missing_arguments(tstate, co, missing, -1, fastlocals);
goto fail;
}
}
/* Allocate and initialize storage for cell vars, and copy free
vars into frame. */
for (i = 0; i < PyTuple_GET_SIZE(co->co_cellvars); ++i) {
PyObject *c;
Py_ssize_t arg;
/* Possibly account for the cell variable being an argument. */
if (co->co_cell2arg != NULL &&
(arg = co->co_cell2arg[i]) != CO_CELL_NOT_AN_ARG) {
c = PyCell_New(GETLOCAL(arg));
/* Clear the local copy. */
SETLOCAL(arg, NULL);
}
else {
c = PyCell_New(NULL);
}
if (c == NULL)
goto fail;
SETLOCAL(co->co_nlocals + i, c);
}
/* Copy closure variables to free variables */
for (i = 0; i < PyTuple_GET_SIZE(co->co_freevars); ++i) {
PyObject *o = PyTuple_GET_ITEM(closure, i);
Py_INCREF(o);
freevars[PyTuple_GET_SIZE(co->co_cellvars) + i] = o;
}
/* Handle generator/coroutine/asynchronous generator */
if (co->co_flags & (CO_GENERATOR | CO_COROUTINE | CO_ASYNC_GENERATOR)) {
PyObject *gen;
int is_coro = co->co_flags & CO_COROUTINE;
/* Don't need to keep the reference to f_back, it will be set
* when the generator is resumed. */
Py_CLEAR(f->f_back);
/* Create a new generator that owns the ready to run frame
* and return that as the value. */
if (is_coro) {
gen = PyCoro_New(f, name, qualname);
} else if (co->co_flags & CO_ASYNC_GENERATOR) {
gen = PyAsyncGen_New(f, name, qualname);
} else {
gen = PyGen_NewWithQualName(f, name, qualname);
}
if (gen == NULL) {
return NULL;
}
_PyObject_GC_TRACK(f);
return gen;
}
retval = PyEval_EvalFrameEx(f,0);
fail: /* Jump here from prelude on failure */
/* decref'ing the frame can cause __del__ methods to get invoked,
which can call back into Python. While we're done with the
current Python frame (f), the associated C stack is still in use,
so recursion_depth must be boosted for the duration.
*/
assert(tstate != NULL);
if (Py_REFCNT(f) > 1) {
Py_DECREF(f);
_PyObject_GC_TRACK(f);
}
else {
++tstate->recursion_depth;
Py_DECREF(f);
--tstate->recursion_depth;
}
return retval;
}
PyObject *
PyEval_EvalCodeEx(PyObject *_co, PyObject *globals, PyObject *locals,
PyObject *const *args, int argcount,
PyObject *const *kws, int kwcount,
PyObject *const *defs, int defcount,
PyObject *kwdefs, PyObject *closure)
{
return _PyEval_EvalCodeWithName(_co, globals, locals,
args, argcount,
kws, kws != NULL ? kws + 1 : NULL,
kwcount, 2,
defs, defcount,
kwdefs, closure,
NULL, NULL);
}
static PyObject *
special_lookup(PyThreadState *tstate, PyObject *o, _Py_Identifier *id)
{
PyObject *res;
res = _PyObject_LookupSpecial(o, id);
if (res == NULL && !_PyErr_Occurred(tstate)) {
_PyErr_SetObject(tstate, PyExc_AttributeError, id->object);
return NULL;
}
return res;
}
/* Logic for the raise statement (too complicated for inlining).
This *consumes* a reference count to each of its arguments. */
static int
do_raise(PyThreadState *tstate, PyObject *exc, PyObject *cause)
{
PyObject *type = NULL, *value = NULL;
if (exc == NULL) {
/* Reraise */
_PyErr_StackItem *exc_info = _PyErr_GetTopmostException(tstate);
PyObject *tb;
type = exc_info->exc_type;
value = exc_info->exc_value;
tb = exc_info->exc_traceback;
if (type == Py_None || type == NULL) {
_PyErr_SetString(tstate, PyExc_RuntimeError,
"No active exception to reraise");
return 0;
}
Py_XINCREF(type);
Py_XINCREF(value);
Py_XINCREF(tb);
_PyErr_Restore(tstate, type, value, tb);
return 1;
}
/* We support the following forms of raise:
raise
raise <instance>
raise <type> */
if (PyExceptionClass_Check(exc)) {
type = exc;
value = _PyObject_CallNoArg(exc);
if (value == NULL)
goto raise_error;
if (!PyExceptionInstance_Check(value)) {
_PyErr_Format(tstate, PyExc_TypeError,
"calling %R should have returned an instance of "
"BaseException, not %R",
type, Py_TYPE(value));
goto raise_error;
}
}
else if (PyExceptionInstance_Check(exc)) {
value = exc;
type = PyExceptionInstance_Class(exc);
Py_INCREF(type);
}
else {
/* Not something you can raise. You get an exception
anyway, just not what you specified :-) */
Py_DECREF(exc);
_PyErr_SetString(tstate, PyExc_TypeError,
"exceptions must derive from BaseException");
goto raise_error;
}
assert(type != NULL);
assert(value != NULL);
if (cause) {
PyObject *fixed_cause;
if (PyExceptionClass_Check(cause)) {
fixed_cause = _PyObject_CallNoArg(cause);
if (fixed_cause == NULL)
goto raise_error;
Py_DECREF(cause);
}
else if (PyExceptionInstance_Check(cause)) {
fixed_cause = cause;
}
else if (cause == Py_None) {
Py_DECREF(cause);
fixed_cause = NULL;
}
else {
_PyErr_SetString(tstate, PyExc_TypeError,
"exception causes must derive from "
"BaseException");
goto raise_error;
}
PyException_SetCause(value, fixed_cause);
}
_PyErr_SetObject(tstate, type, value);
/* PyErr_SetObject incref's its arguments */
Py_DECREF(value);
Py_DECREF(type);
return 0;
raise_error:
Py_XDECREF(value);
Py_XDECREF(type);
Py_XDECREF(cause);
return 0;
}
/* Iterate v argcnt times and store the results on the stack (via decreasing
sp). Return 1 for success, 0 if error.
If argcntafter == -1, do a simple unpack. If it is >= 0, do an unpack
with a variable target.
*/
static int
unpack_iterable(PyThreadState *tstate, PyObject *v,
int argcnt, int argcntafter, PyObject **sp)
{
int i = 0, j = 0;
Py_ssize_t ll = 0;
PyObject *it; /* iter(v) */
PyObject *w;
PyObject *l = NULL; /* variable list */
assert(v != NULL);
it = PyObject_GetIter(v);
if (it == NULL) {
if (_PyErr_ExceptionMatches(tstate, PyExc_TypeError) &&
v->ob_type->tp_iter == NULL && !PySequence_Check(v))
{
_PyErr_Format(tstate, PyExc_TypeError,
"cannot unpack non-iterable %.200s object",
v->ob_type->tp_name);
}
return 0;
}
for (; i < argcnt; i++) {
w = PyIter_Next(it);
if (w == NULL) {
/* Iterator done, via error or exhaustion. */
if (!_PyErr_Occurred(tstate)) {
if (argcntafter == -1) {
_PyErr_Format(tstate, PyExc_ValueError,
"not enough values to unpack "
"(expected %d, got %d)",
argcnt, i);
}
else {
_PyErr_Format(tstate, PyExc_ValueError,
"not enough values to unpack "
"(expected at least %d, got %d)",
argcnt + argcntafter, i);
}
}
goto Error;
}
*--sp = w;
}
if (argcntafter == -1) {
/* We better have exhausted the iterator now. */
w = PyIter_Next(it);
if (w == NULL) {
if (_PyErr_Occurred(tstate))
goto Error;
Py_DECREF(it);
return 1;
}
Py_DECREF(w);
_PyErr_Format(tstate, PyExc_ValueError,
"too many values to unpack (expected %d)",
argcnt);
goto Error;
}
l = PySequence_List(it);
if (l == NULL)
goto Error;
*--sp = l;
i++;
ll = PyList_GET_SIZE(l);
if (ll < argcntafter) {
_PyErr_Format(tstate, PyExc_ValueError,
"not enough values to unpack (expected at least %d, got %zd)",
argcnt + argcntafter, argcnt + ll);
goto Error;
}
/* Pop the "after-variable" args off the list. */
for (j = argcntafter; j > 0; j--, i++) {
*--sp = PyList_GET_ITEM(l, ll - j);
}
/* Resize the list. */
Py_SIZE(l) = ll - argcntafter;
Py_DECREF(it);
return 1;
Error:
for (; i > 0; i--, sp++)
Py_DECREF(*sp);
Py_XDECREF(it);
return 0;
}
#ifdef LLTRACE
static int
prtrace(PyThreadState *tstate, PyObject *v, const char *str)
{
printf("%s ", str);
if (PyObject_Print(v, stdout, 0) != 0) {
/* Don't know what else to do */
_PyErr_Clear(tstate);
}
printf("\n");
return 1;
}
#endif
static void
call_exc_trace(Py_tracefunc func, PyObject *self,
PyThreadState *tstate, PyFrameObject *f)
{
PyObject *type, *value, *traceback, *orig_traceback, *arg;
int err;
_PyErr_Fetch(tstate, &type, &value, &orig_traceback);
if (value == NULL) {
value = Py_None;
Py_INCREF(value);
}
_PyErr_NormalizeException(tstate, &type, &value, &orig_traceback);
traceback = (orig_traceback != NULL) ? orig_traceback : Py_None;
arg = PyTuple_Pack(3, type, value, traceback);
if (arg == NULL) {
_PyErr_Restore(tstate, type, value, orig_traceback);
return;
}
err = call_trace(func, self, tstate, f, PyTrace_EXCEPTION, arg);
Py_DECREF(arg);
if (err == 0) {
_PyErr_Restore(tstate, type, value, orig_traceback);
}
else {
Py_XDECREF(type);
Py_XDECREF(value);
Py_XDECREF(orig_traceback);
}
}
static int
call_trace_protected(Py_tracefunc func, PyObject *obj,
PyThreadState *tstate, PyFrameObject *frame,
int what, PyObject *arg)
{
PyObject *type, *value, *traceback;
int err;
_PyErr_Fetch(tstate, &type, &value, &traceback);
err = call_trace(func, obj, tstate, frame, what, arg);
if (err == 0)
{
_PyErr_Restore(tstate, type, value, traceback);
return 0;
}
else {
Py_XDECREF(type);
Py_XDECREF(value);
Py_XDECREF(traceback);
return -1;
}
}
static int
call_trace(Py_tracefunc func, PyObject *obj,
PyThreadState *tstate, PyFrameObject *frame,
int what, PyObject *arg)
{
int result;
if (tstate->tracing)
return 0;
tstate->tracing++;
tstate->use_tracing = 0;
result = func(obj, frame, what, arg);
tstate->use_tracing = ((tstate->c_tracefunc != NULL)
|| (tstate->c_profilefunc != NULL));
tstate->tracing--;
return result;
}
PyObject *
_PyEval_CallTracing(PyObject *func, PyObject *args)
{
PyThreadState *tstate = _PyThreadState_GET();
int save_tracing = tstate->tracing;
int save_use_tracing = tstate->use_tracing;
PyObject *result;
tstate->tracing = 0;
tstate->use_tracing = ((tstate->c_tracefunc != NULL)
|| (tstate->c_profilefunc != NULL));
result = PyObject_Call(func, args, NULL);
tstate->tracing = save_tracing;
tstate->use_tracing = save_use_tracing;
return result;
}
/* See Objects/lnotab_notes.txt for a description of how tracing works. */
static int
maybe_call_line_trace(Py_tracefunc func, PyObject *obj,
PyThreadState *tstate, PyFrameObject *frame,
int *instr_lb, int *instr_ub, int *instr_prev)
{
int result = 0;
int line = frame->f_lineno;
/* If the last instruction executed isn't in the current
instruction window, reset the window.
*/
if (frame->f_lasti < *instr_lb || frame->f_lasti >= *instr_ub) {
PyAddrPair bounds;
line = _PyCode_CheckLineNumber(frame->f_code, frame->f_lasti,
&bounds);
*instr_lb = bounds.ap_lower;
*instr_ub = bounds.ap_upper;
}
/* If the last instruction falls at the start of a line or if it
represents a jump backwards, update the frame's line number and
then call the trace function if we're tracing source lines.
*/
if ((frame->f_lasti == *instr_lb || frame->f_lasti < *instr_prev)) {
frame->f_lineno = line;
if (frame->f_trace_lines) {
result = call_trace(func, obj, tstate, frame, PyTrace_LINE, Py_None);
}
}
/* Always emit an opcode event if we're tracing all opcodes. */
if (frame->f_trace_opcodes) {
result = call_trace(func, obj, tstate, frame, PyTrace_OPCODE, Py_None);
}
*instr_prev = frame->f_lasti;
return result;
}
void
PyEval_SetProfile(Py_tracefunc func, PyObject *arg)
{
if (PySys_Audit("sys.setprofile", NULL) < 0) {
_PyErr_WriteUnraisableMsg("in PyEval_SetProfile", NULL);
return;
}
PyThreadState *tstate = _PyThreadState_GET();
PyObject *temp = tstate->c_profileobj;
Py_XINCREF(arg);
tstate->c_profilefunc = NULL;
tstate->c_profileobj = NULL;
/* Must make sure that tracing is not ignored if 'temp' is freed */
tstate->use_tracing = tstate->c_tracefunc != NULL;
Py_XDECREF(temp);
tstate->c_profilefunc = func;
tstate->c_profileobj = arg;
/* Flag that tracing or profiling is turned on */
tstate->use_tracing = (func != NULL) || (tstate->c_tracefunc != NULL);
}
void
PyEval_SetTrace(Py_tracefunc func, PyObject *arg)
{
if (PySys_Audit("sys.settrace", NULL) < 0) {
_PyErr_WriteUnraisableMsg("in PyEval_SetTrace", NULL);
return;
}
_PyRuntimeState *runtime = &_PyRuntime;
PyThreadState *tstate = _PyRuntimeState_GetThreadState(runtime);
PyObject *temp = tstate->c_traceobj;
runtime->ceval.tracing_possible += (func != NULL) - (tstate->c_tracefunc != NULL);
Py_XINCREF(arg);
tstate->c_tracefunc = NULL;
tstate->c_traceobj = NULL;
/* Must make sure that profiling is not ignored if 'temp' is freed */
tstate->use_tracing = tstate->c_profilefunc != NULL;
Py_XDECREF(temp);
tstate->c_tracefunc = func;
tstate->c_traceobj = arg;
/* Flag that tracing or profiling is turned on */
tstate->use_tracing = ((func != NULL)
|| (tstate->c_profilefunc != NULL));
}
void
_PyEval_SetCoroutineOriginTrackingDepth(int new_depth)
{
assert(new_depth >= 0);
PyThreadState *tstate = _PyThreadState_GET();
tstate->coroutine_origin_tracking_depth = new_depth;
}
int
_PyEval_GetCoroutineOriginTrackingDepth(void)
{
PyThreadState *tstate = _PyThreadState_GET();
return tstate->coroutine_origin_tracking_depth;
}
PyObject *
_PyEval_GetAsyncGenFirstiter(void)
{
PyThreadState *tstate = _PyThreadState_GET();
return tstate->async_gen_firstiter;
}
PyObject *
_PyEval_GetAsyncGenFinalizer(void)
{
PyThreadState *tstate = _PyThreadState_GET();
return tstate->async_gen_finalizer;
}
static PyFrameObject *
_PyEval_GetFrame(PyThreadState *tstate)
{
return _PyRuntime.gilstate.getframe(tstate);
}
PyFrameObject *
PyEval_GetFrame(void)
{
PyThreadState *tstate = _PyThreadState_GET();
return _PyEval_GetFrame(tstate);
}
PyObject *
PyEval_GetBuiltins(void)
{
PyThreadState *tstate = _PyThreadState_GET();
PyFrameObject *current_frame = _PyEval_GetFrame(tstate);
if (current_frame == NULL)
return tstate->interp->builtins;
else
return current_frame->f_builtins;
}
/* Convenience function to get a builtin from its name */
PyObject *
_PyEval_GetBuiltinId(_Py_Identifier *name)
{
PyThreadState *tstate = _PyThreadState_GET();
PyObject *attr = _PyDict_GetItemIdWithError(PyEval_GetBuiltins(), name);
if (attr) {
Py_INCREF(attr);
}
else if (!_PyErr_Occurred(tstate)) {
_PyErr_SetObject(tstate, PyExc_AttributeError, _PyUnicode_FromId(name));
}
return attr;
}
PyObject *
PyEval_GetLocals(void)
{
PyThreadState *tstate = _PyThreadState_GET();
PyFrameObject *current_frame = _PyEval_GetFrame(tstate);
if (current_frame == NULL) {
_PyErr_SetString(tstate, PyExc_SystemError, "frame does not exist");
return NULL;
}
if (PyFrame_FastToLocalsWithError(current_frame) < 0) {
return NULL;
}
assert(current_frame->f_locals != NULL);
return current_frame->f_locals;
}
PyObject *
PyEval_GetGlobals(void)
{
PyThreadState *tstate = _PyThreadState_GET();
PyFrameObject *current_frame = _PyEval_GetFrame(tstate);
if (current_frame == NULL) {
return NULL;
}
assert(current_frame->f_globals != NULL);
return current_frame->f_globals;
}
int
PyEval_MergeCompilerFlags(PyCompilerFlags *cf)
{
PyThreadState *tstate = _PyThreadState_GET();
PyFrameObject *current_frame = _PyEval_GetFrame(tstate);
int result = cf->cf_flags != 0;
if (current_frame != NULL) {
const int codeflags = current_frame->f_code->co_flags;
const int compilerflags = codeflags & PyCF_MASK;
if (compilerflags) {
result = 1;
cf->cf_flags |= compilerflags;
}
#if 0 /* future keyword */
if (codeflags & CO_GENERATOR_ALLOWED) {
result = 1;
cf->cf_flags |= CO_GENERATOR_ALLOWED;
}
#endif
}
return result;
}
const char *
PyEval_GetFuncName(PyObject *func)
{
if (PyMethod_Check(func))
return PyEval_GetFuncName(PyMethod_GET_FUNCTION(func));
else if (PyFunction_Check(func))
return PyUnicode_AsUTF8(((PyFunctionObject*)func)->func_name);
else if (PyCFunction_Check(func))
return ((PyCFunctionObject*)func)->m_ml->ml_name;
else
return func->ob_type->tp_name;
}
const char *
PyEval_GetFuncDesc(PyObject *func)
{
if (PyMethod_Check(func))
return "()";
else if (PyFunction_Check(func))
return "()";
else if (PyCFunction_Check(func))
return "()";
else
return " object";
}
#define C_TRACE(x, call) \
if (tstate->use_tracing && tstate->c_profilefunc) { \
if (call_trace(tstate->c_profilefunc, tstate->c_profileobj, \
tstate, tstate->frame, \
PyTrace_C_CALL, func)) { \
x = NULL; \
} \
else { \
x = call; \
if (tstate->c_profilefunc != NULL) { \
if (x == NULL) { \
call_trace_protected(tstate->c_profilefunc, \
tstate->c_profileobj, \
tstate, tstate->frame, \
PyTrace_C_EXCEPTION, func); \
/* XXX should pass (type, value, tb) */ \
} else { \
if (call_trace(tstate->c_profilefunc, \
tstate->c_profileobj, \
tstate, tstate->frame, \
PyTrace_C_RETURN, func)) { \
Py_DECREF(x); \
x = NULL; \
} \
} \
} \
} \
} else { \
x = call; \
}
static PyObject *
trace_call_function(PyThreadState *tstate,
PyObject *func,
PyObject **args, Py_ssize_t nargs,
PyObject *kwnames)
{
PyObject *x;
if (PyCFunction_Check(func)) {
C_TRACE(x, _PyObject_Vectorcall(func, args, nargs, kwnames));
return x;
}
else if (Py_TYPE(func) == &PyMethodDescr_Type && nargs > 0) {
/* We need to create a temporary bound method as argument
for profiling.
If nargs == 0, then this cannot work because we have no
"self". In any case, the call itself would raise
TypeError (foo needs an argument), so we just skip
profiling. */
PyObject *self = args[0];
func = Py_TYPE(func)->tp_descr_get(func, self, (PyObject*)Py_TYPE(self));
if (func == NULL) {
return NULL;
}
C_TRACE(x, _PyObject_Vectorcall(func,
args+1, nargs-1,
kwnames));
Py_DECREF(func);
return x;
}
return _PyObject_Vectorcall(func, args, nargs | PY_VECTORCALL_ARGUMENTS_OFFSET, kwnames);
}
/* Issue #29227: Inline call_function() into _PyEval_EvalFrameDefault()
to reduce the stack consumption. */
Py_LOCAL_INLINE(PyObject *) _Py_HOT_FUNCTION
call_function(PyThreadState *tstate, PyObject ***pp_stack, Py_ssize_t oparg, PyObject *kwnames)
{
PyObject **pfunc = (*pp_stack) - oparg - 1;
PyObject *func = *pfunc;
PyObject *x, *w;
Py_ssize_t nkwargs = (kwnames == NULL) ? 0 : PyTuple_GET_SIZE(kwnames);
Py_ssize_t nargs = oparg - nkwargs;
PyObject **stack = (*pp_stack) - nargs - nkwargs;
if (tstate->use_tracing) {
x = trace_call_function(tstate, func, stack, nargs, kwnames);
}
else {
x = _PyObject_Vectorcall(func, stack, nargs | PY_VECTORCALL_ARGUMENTS_OFFSET, kwnames);
}
assert((x != NULL) ^ (_PyErr_Occurred(tstate) != NULL));
/* Clear the stack of the function object. */
while ((*pp_stack) > pfunc) {
w = EXT_POP(*pp_stack);
Py_DECREF(w);
}
return x;
}
static PyObject *
do_call_core(PyThreadState *tstate, PyObject *func, PyObject *callargs, PyObject *kwdict)
{
PyObject *result;
if (PyCFunction_Check(func)) {
C_TRACE(result, PyCFunction_Call(func, callargs, kwdict));
return result;
}
else if (Py_TYPE(func) == &PyMethodDescr_Type) {
Py_ssize_t nargs = PyTuple_GET_SIZE(callargs);
if (nargs > 0 && tstate->use_tracing) {
/* We need to create a temporary bound method as argument
for profiling.
If nargs == 0, then this cannot work because we have no
"self". In any case, the call itself would raise
TypeError (foo needs an argument), so we just skip
profiling. */
PyObject *self = PyTuple_GET_ITEM(callargs, 0);
func = Py_TYPE(func)->tp_descr_get(func, self, (PyObject*)Py_TYPE(self));
if (func == NULL) {
return NULL;
}
C_TRACE(result, _PyObject_FastCallDict(func,
&_PyTuple_ITEMS(callargs)[1],
nargs - 1,
kwdict));
Py_DECREF(func);
return result;
}
}
return PyObject_Call(func, callargs, kwdict);
}
/* Extract a slice index from a PyLong or an object with the
nb_index slot defined, and store in *pi.
Silently reduce values larger than PY_SSIZE_T_MAX to PY_SSIZE_T_MAX,
and silently boost values less than PY_SSIZE_T_MIN to PY_SSIZE_T_MIN.
Return 0 on error, 1 on success.
*/
int
_PyEval_SliceIndex(PyObject *v, Py_ssize_t *pi)
{
PyThreadState *tstate = _PyThreadState_GET();
if (v != Py_None) {
Py_ssize_t x;
if (PyIndex_Check(v)) {
x = PyNumber_AsSsize_t(v, NULL);
if (x == -1 && _PyErr_Occurred(tstate))
return 0;
}
else {
_PyErr_SetString(tstate, PyExc_TypeError,
"slice indices must be integers or "
"None or have an __index__ method");
return 0;
}
*pi = x;
}
return 1;
}
int
_PyEval_SliceIndexNotNone(PyObject *v, Py_ssize_t *pi)
{
PyThreadState *tstate = _PyThreadState_GET();
Py_ssize_t x;
if (PyIndex_Check(v)) {
x = PyNumber_AsSsize_t(v, NULL);
if (x == -1 && _PyErr_Occurred(tstate))
return 0;
}
else {
_PyErr_SetString(tstate, PyExc_TypeError,
"slice indices must be integers or "
"have an __index__ method");
return 0;
}
*pi = x;
return 1;
}
#define CANNOT_CATCH_MSG "catching classes that do not inherit from "\
"BaseException is not allowed"
static PyObject *
cmp_outcome(PyThreadState *tstate, int op, PyObject *v, PyObject *w)
{
int res = 0;
switch (op) {
case PyCmp_IS:
res = (v == w);
break;
case PyCmp_IS_NOT:
res = (v != w);
break;
case PyCmp_IN:
res = PySequence_Contains(w, v);
if (res < 0)
return NULL;
break;
case PyCmp_NOT_IN:
res = PySequence_Contains(w, v);
if (res < 0)
return NULL;
res = !res;
break;
case PyCmp_EXC_MATCH:
if (PyTuple_Check(w)) {
Py_ssize_t i, length;
length = PyTuple_Size(w);
for (i = 0; i < length; i += 1) {
PyObject *exc = PyTuple_GET_ITEM(w, i);
if (!PyExceptionClass_Check(exc)) {
_PyErr_SetString(tstate, PyExc_TypeError,
CANNOT_CATCH_MSG);
return NULL;
}
}
}
else {
if (!PyExceptionClass_Check(w)) {
_PyErr_SetString(tstate, PyExc_TypeError,
CANNOT_CATCH_MSG);
return NULL;
}
}
res = PyErr_GivenExceptionMatches(v, w);
break;
default:
return PyObject_RichCompare(v, w, op);
}
v = res ? Py_True : Py_False;
Py_INCREF(v);
return v;
}
static PyObject *
import_name(PyThreadState *tstate, PyFrameObject *f,
PyObject *name, PyObject *fromlist, PyObject *level)
{
_Py_IDENTIFIER(__import__);
PyObject *import_func, *res;
PyObject* stack[5];
import_func = _PyDict_GetItemIdWithError(f->f_builtins, &PyId___import__);
if (import_func == NULL) {
if (!_PyErr_Occurred(tstate)) {
_PyErr_SetString(tstate, PyExc_ImportError, "__import__ not found");
}
return NULL;
}
/* Fast path for not overloaded __import__. */
if (import_func == tstate->interp->import_func) {
int ilevel = _PyLong_AsInt(level);
if (ilevel == -1 && _PyErr_Occurred(tstate)) {
return NULL;
}
res = PyImport_ImportModuleLevelObject(
name,
f->f_globals,
f->f_locals == NULL ? Py_None : f->f_locals,
fromlist,
ilevel);
return res;
}
Py_INCREF(import_func);
stack[0] = name;
stack[1] = f->f_globals;
stack[2] = f->f_locals == NULL ? Py_None : f->f_locals;
stack[3] = fromlist;
stack[4] = level;
res = _PyObject_FastCall(import_func, stack, 5);
Py_DECREF(import_func);
return res;
}
static PyObject *
import_from(PyThreadState *tstate, PyObject *v, PyObject *name)
{
PyObject *x;
_Py_IDENTIFIER(__name__);
PyObject *fullmodname, *pkgname, *pkgpath, *pkgname_or_unknown, *errmsg;
if (_PyObject_LookupAttr(v, name, &x) != 0) {
return x;
}
/* Issue #17636: in case this failed because of a circular relative
import, try to fallback on reading the module directly from
sys.modules. */
pkgname = _PyObject_GetAttrId(v, &PyId___name__);
if (pkgname == NULL) {
goto error;
}
if (!PyUnicode_Check(pkgname)) {
Py_CLEAR(pkgname);
goto error;
}
fullmodname = PyUnicode_FromFormat("%U.%U", pkgname, name);
if (fullmodname == NULL) {
Py_DECREF(pkgname);
return NULL;
}
x = PyImport_GetModule(fullmodname);
Py_DECREF(fullmodname);
if (x == NULL && !_PyErr_Occurred(tstate)) {
goto error;
}
Py_DECREF(pkgname);
return x;
error:
pkgpath = PyModule_GetFilenameObject(v);
if (pkgname == NULL) {
pkgname_or_unknown = PyUnicode_FromString("<unknown module name>");
if (pkgname_or_unknown == NULL) {
Py_XDECREF(pkgpath);
return NULL;
}
} else {
pkgname_or_unknown = pkgname;
}
if (pkgpath == NULL || !PyUnicode_Check(pkgpath)) {
_PyErr_Clear(tstate);
errmsg = PyUnicode_FromFormat(
"cannot import name %R from %R (unknown location)",
name, pkgname_or_unknown
);
/* NULL checks for errmsg and pkgname done by PyErr_SetImportError. */
PyErr_SetImportError(errmsg, pkgname, NULL);
}
else {
_Py_IDENTIFIER(__spec__);
PyObject *spec = _PyObject_GetAttrId(v, &PyId___spec__);
const char *fmt =
_PyModuleSpec_IsInitializing(spec) ?
"cannot import name %R from partially initialized module %R "
"(most likely due to a circular import) (%S)" :
"cannot import name %R from %R (%S)";
Py_XDECREF(spec);
errmsg = PyUnicode_FromFormat(fmt, name, pkgname_or_unknown, pkgpath);
/* NULL checks for errmsg and pkgname done by PyErr_SetImportError. */
PyErr_SetImportError(errmsg, pkgname, pkgpath);
}
Py_XDECREF(errmsg);
Py_XDECREF(pkgname_or_unknown);
Py_XDECREF(pkgpath);
return NULL;
}
static int
import_all_from(PyThreadState *tstate, PyObject *locals, PyObject *v)
{
_Py_IDENTIFIER(__all__);
_Py_IDENTIFIER(__dict__);
_Py_IDENTIFIER(__name__);
PyObject *all, *dict, *name, *value;
int skip_leading_underscores = 0;
int pos, err;
if (_PyObject_LookupAttrId(v, &PyId___all__, &all) < 0) {
return -1; /* Unexpected error */
}
if (all == NULL) {
if (_PyObject_LookupAttrId(v, &PyId___dict__, &dict) < 0) {
return -1;
}
if (dict == NULL) {
_PyErr_SetString(tstate, PyExc_ImportError,
"from-import-* object has no __dict__ and no __all__");
return -1;
}
all = PyMapping_Keys(dict);
Py_DECREF(dict);
if (all == NULL)
return -1;
skip_leading_underscores = 1;
}
for (pos = 0, err = 0; ; pos++) {
name = PySequence_GetItem(all, pos);
if (name == NULL) {
if (!_PyErr_ExceptionMatches(tstate, PyExc_IndexError)) {
err = -1;
}
else {
_PyErr_Clear(tstate);
}
break;
}
if (!PyUnicode_Check(name)) {
PyObject *modname = _PyObject_GetAttrId(v, &PyId___name__);
if (modname == NULL) {
Py_DECREF(name);
err = -1;
break;
}
if (!PyUnicode_Check(modname)) {
_PyErr_Format(tstate, PyExc_TypeError,
"module __name__ must be a string, not %.100s",
Py_TYPE(modname)->tp_name);
}
else {
_PyErr_Format(tstate, PyExc_TypeError,
"%s in %U.%s must be str, not %.100s",
skip_leading_underscores ? "Key" : "Item",
modname,
skip_leading_underscores ? "__dict__" : "__all__",
Py_TYPE(name)->tp_name);
}
Py_DECREF(modname);
Py_DECREF(name);
err = -1;
break;
}
if (skip_leading_underscores) {
if (PyUnicode_READY(name) == -1) {
Py_DECREF(name);
err = -1;
break;
}
if (PyUnicode_READ_CHAR(name, 0) == '_') {
Py_DECREF(name);
continue;
}
}
value = PyObject_GetAttr(v, name);
if (value == NULL)
err = -1;
else if (PyDict_CheckExact(locals))
err = PyDict_SetItem(locals, name, value);
else
err = PyObject_SetItem(locals, name, value);
Py_DECREF(name);
Py_XDECREF(value);
if (err != 0)
break;
}
Py_DECREF(all);
return err;
}
static int
check_args_iterable(PyThreadState *tstate, PyObject *func, PyObject *args)
{
if (args->ob_type->tp_iter == NULL && !PySequence_Check(args)) {
_PyErr_Format(tstate, PyExc_TypeError,
"%.200s%.200s argument after * "
"must be an iterable, not %.200s",
PyEval_GetFuncName(func),
PyEval_GetFuncDesc(func),
args->ob_type->tp_name);
return -1;
}
return 0;
}
static void
format_kwargs_error(PyThreadState *tstate, PyObject *func, PyObject *kwargs)
{
/* _PyDict_MergeEx raises attribute
* error (percolated from an attempt
* to get 'keys' attribute) instead of
* a type error if its second argument
* is not a mapping.
*/
if (_PyErr_ExceptionMatches(tstate, PyExc_AttributeError)) {
_PyErr_Format(tstate, PyExc_TypeError,
"%.200s%.200s argument after ** "
"must be a mapping, not %.200s",
PyEval_GetFuncName(func),
PyEval_GetFuncDesc(func),
kwargs->ob_type->tp_name);
}
else if (_PyErr_ExceptionMatches(tstate, PyExc_KeyError)) {
PyObject *exc, *val, *tb;
_PyErr_Fetch(tstate, &exc, &val, &tb);
if (val && PyTuple_Check(val) && PyTuple_GET_SIZE(val) == 1) {
PyObject *key = PyTuple_GET_ITEM(val, 0);
if (!PyUnicode_Check(key)) {
_PyErr_Format(tstate, PyExc_TypeError,
"%.200s%.200s keywords must be strings",
PyEval_GetFuncName(func),
PyEval_GetFuncDesc(func));
}
else {
_PyErr_Format(tstate, PyExc_TypeError,
"%.200s%.200s got multiple "
"values for keyword argument '%U'",
PyEval_GetFuncName(func),
PyEval_GetFuncDesc(func),
key);
}
Py_XDECREF(exc);
Py_XDECREF(val);
Py_XDECREF(tb);
}
else {
_PyErr_Restore(tstate, exc, val, tb);
}
}
}
static void
format_exc_check_arg(PyThreadState *tstate, PyObject *exc,
const char *format_str, PyObject *obj)
{
const char *obj_str;
if (!obj)
return;
obj_str = PyUnicode_AsUTF8(obj);
if (!obj_str)
return;
_PyErr_Format(tstate, exc, format_str, obj_str);
}
static void
format_exc_unbound(PyThreadState *tstate, PyCodeObject *co, int oparg)
{
PyObject *name;
/* Don't stomp existing exception */
if (_PyErr_Occurred(tstate))
return;
if (oparg < PyTuple_GET_SIZE(co->co_cellvars)) {
name = PyTuple_GET_ITEM(co->co_cellvars,
oparg);
format_exc_check_arg(tstate,
PyExc_UnboundLocalError,
UNBOUNDLOCAL_ERROR_MSG,
name);
} else {
name = PyTuple_GET_ITEM(co->co_freevars, oparg -
PyTuple_GET_SIZE(co->co_cellvars));
format_exc_check_arg(tstate, PyExc_NameError,
UNBOUNDFREE_ERROR_MSG, name);
}
}
static void
format_awaitable_error(PyThreadState *tstate, PyTypeObject *type, int prevopcode)
{
if (type->tp_as_async == NULL || type->tp_as_async->am_await == NULL) {
if (prevopcode == BEFORE_ASYNC_WITH) {
_PyErr_Format(tstate, PyExc_TypeError,
"'async with' received an object from __aenter__ "
"that does not implement __await__: %.100s",
type->tp_name);
}
else if (prevopcode == WITH_CLEANUP_START) {
_PyErr_Format(tstate, PyExc_TypeError,
"'async with' received an object from __aexit__ "
"that does not implement __await__: %.100s",
type->tp_name);
}
}
}
static PyObject *
unicode_concatenate(PyThreadState *tstate, PyObject *v, PyObject *w,
PyFrameObject *f, const _Py_CODEUNIT *next_instr)
{
PyObject *res;
if (Py_REFCNT(v) == 2) {
/* In the common case, there are 2 references to the value
* stored in 'variable' when the += is performed: one on the
* value stack (in 'v') and one still stored in the
* 'variable'. We try to delete the variable now to reduce
* the refcnt to 1.
*/
int opcode, oparg;
NEXTOPARG();
switch (opcode) {
case STORE_FAST:
{
PyObject **fastlocals = f->f_localsplus;
if (GETLOCAL(oparg) == v)
SETLOCAL(oparg, NULL);
break;
}
case STORE_DEREF:
{
PyObject **freevars = (f->f_localsplus +
f->f_code->co_nlocals);
PyObject *c = freevars[oparg];
if (PyCell_GET(c) == v) {
PyCell_SET(c, NULL);
Py_DECREF(v);
}
break;
}
case STORE_NAME:
{
PyObject *names = f->f_code->co_names;
PyObject *name = GETITEM(names, oparg);
PyObject *locals = f->f_locals;
if (locals && PyDict_CheckExact(locals)) {
PyObject *w = PyDict_GetItemWithError(locals, name);
if ((w == v && PyDict_DelItem(locals, name) != 0) ||
(w == NULL && _PyErr_Occurred(tstate)))
{
Py_DECREF(v);
return NULL;
}
}
break;
}
}
}
res = v;
PyUnicode_Append(&res, w);
return res;
}
#ifdef DYNAMIC_EXECUTION_PROFILE
static PyObject *
getarray(long a[256])
{
int i;
PyObject *l = PyList_New(256);
if (l == NULL) return NULL;
for (i = 0; i < 256; i++) {
PyObject *x = PyLong_FromLong(a[i]);
if (x == NULL) {
Py_DECREF(l);
return NULL;
}
PyList_SET_ITEM(l, i, x);
}
for (i = 0; i < 256; i++)
a[i] = 0;
return l;
}
PyObject *
_Py_GetDXProfile(PyObject *self, PyObject *args)
{
#ifndef DXPAIRS
return getarray(dxp);
#else
int i;
PyObject *l = PyList_New(257);
if (l == NULL) return NULL;
for (i = 0; i < 257; i++) {
PyObject *x = getarray(dxpairs[i]);
if (x == NULL) {
Py_DECREF(l);
return NULL;
}
PyList_SET_ITEM(l, i, x);
}
return l;
#endif
}
#endif
Py_ssize_t
_PyEval_RequestCodeExtraIndex(freefunc free)
{
PyInterpreterState *interp = _PyInterpreterState_GET_UNSAFE();
Py_ssize_t new_index;
if (interp->co_extra_user_count == MAX_CO_EXTRA_USERS - 1) {
return -1;
}
new_index = interp->co_extra_user_count++;
interp->co_extra_freefuncs[new_index] = free;
return new_index;
}
static void
dtrace_function_entry(PyFrameObject *f)
{
const char *filename;
const char *funcname;
int lineno;
filename = PyUnicode_AsUTF8(f->f_code->co_filename);
funcname = PyUnicode_AsUTF8(f->f_code->co_name);
lineno = PyCode_Addr2Line(f->f_code, f->f_lasti);
PyDTrace_FUNCTION_ENTRY(filename, funcname, lineno);
}
static void
dtrace_function_return(PyFrameObject *f)
{
const char *filename;
const char *funcname;
int lineno;
filename = PyUnicode_AsUTF8(f->f_code->co_filename);
funcname = PyUnicode_AsUTF8(f->f_code->co_name);
lineno = PyCode_Addr2Line(f->f_code, f->f_lasti);
PyDTrace_FUNCTION_RETURN(filename, funcname, lineno);
}
/* DTrace equivalent of maybe_call_line_trace. */
static void
maybe_dtrace_line(PyFrameObject *frame,
int *instr_lb, int *instr_ub, int *instr_prev)
{
int line = frame->f_lineno;
const char *co_filename, *co_name;
/* If the last instruction executed isn't in the current
instruction window, reset the window.
*/
if (frame->f_lasti < *instr_lb || frame->f_lasti >= *instr_ub) {
PyAddrPair bounds;
line = _PyCode_CheckLineNumber(frame->f_code, frame->f_lasti,
&bounds);
*instr_lb = bounds.ap_lower;
*instr_ub = bounds.ap_upper;
}
/* If the last instruction falls at the start of a line or if
it represents a jump backwards, update the frame's line
number and call the trace function. */
if (frame->f_lasti == *instr_lb || frame->f_lasti < *instr_prev) {
frame->f_lineno = line;
co_filename = PyUnicode_AsUTF8(frame->f_code->co_filename);
if (!co_filename)
co_filename = "?";
co_name = PyUnicode_AsUTF8(frame->f_code->co_name);
if (!co_name)
co_name = "?";
PyDTrace_LINE(co_filename, co_name, line);
}
*instr_prev = frame->f_lasti;
}
