cpython/Python/ceval.h at main · python/cpython · GitHub

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#define _PY_INTERPRETER

#include "Python.h"

#include "pycore_abstract.h" // _PyIndex_Check()

#include "pycore_audit.h" // _PySys_Audit()

#include "pycore_backoff.h"

#include "pycore_call.h" // _PyObject_CallNoArgs()

#include "pycore_cell.h" // PyCell_GetRef()

#include "pycore_ceval.h" // SPECIAL___ENTER__

#include "pycore_code.h"

#include "pycore_dict.h"

#include "pycore_emscripten_signal.h" // _Py_CHECK_EMSCRIPTEN_SIGNALS

#include "pycore_floatobject.h" // _PyFloat_ExactDealloc()

#include "pycore_frame.h"

#include "pycore_function.h"

#include "pycore_genobject.h" // _PyCoro_GetAwaitableIter()

#include "pycore_import.h" // _PyImport_IsDefaultImportFunc()

#include "pycore_instruments.h"

#include "pycore_interpframe.h" // _PyFrame_SetStackPointer()

#include "pycore_interpolation.h" // _PyInterpolation_Build()

#include "pycore_intrinsics.h"

#include "pycore_jit.h"

#include "pycore_lazyimportobject.h"

#include "pycore_list.h" // _PyList_GetItemRef()

#include "pycore_long.h" // _PyLong_GetZero()

#include "pycore_moduleobject.h" // PyModuleObject

#include "pycore_object.h" // _PyObject_GC_TRACK()

#include "pycore_opcode_metadata.h" // EXTRA_CASES

#include "pycore_opcode_utils.h" // MAKE_FUNCTION_*

#include "pycore_optimizer.h" // _PyUOpExecutor_Type

#include "pycore_pyatomic_ft_wrappers.h" // FT_ATOMIC_*

#include "pycore_pyerrors.h" // _PyErr_GetRaisedException()

#include "pycore_pystate.h" // _PyInterpreterState_GET()

#include "pycore_range.h" // _PyRangeIterObject

#include "pycore_setobject.h" // _PySet_Update()

#include "pycore_sliceobject.h" // _PyBuildSlice_ConsumeRefs

#include "pycore_sysmodule.h" // _PySys_GetOptionalAttrString()

#include "pycore_template.h" // _PyTemplate_Build()

#include "pycore_traceback.h" // _PyTraceBack_FromFrame

#include "pycore_tuple.h" // _PyTuple_ITEMS()

#include "pycore_uop_ids.h" // Uops

#include "dictobject.h"

#include "frameobject.h" // _PyInterpreterFrame_GetLine

#include "opcode.h"

#include "pydtrace.h"

#include "setobject.h"

#include "pycore_stackref.h"

#include <stdbool.h> // bool

#if !defined(Py_BUILD_CORE)

# error "ceval.c must be build with Py_BUILD_CORE define for best performance"

#endif

#if !defined(Py_DEBUG) && !defined(Py_TRACE_REFS)

// GH-89279: The MSVC compiler does not inline these static inline functions

// in PGO build in _PyEval_EvalFrameDefault(), because this function is over

// the limit of PGO, and that limit cannot be configured.

// Define them as macros to make sure that they are always inlined by the

// preprocessor.

#undef Py_IS_TYPE

#define Py_IS_TYPE(ob, type) \

(_PyObject_CAST(ob)->ob_type == (type))

#undef Py_XDECREF

#define Py_XDECREF(arg) \

do { \

PyObject *xop = _PyObject_CAST(arg); \

if (xop != NULL) { \

Py_DECREF(xop); \

} \

} while (0)

#ifndef Py_GIL_DISABLED

#undef Py_DECREF

#define Py_DECREF(arg) \

do { \

PyObject *op = _PyObject_CAST(arg); \

if (_Py_IsImmortal(op)) { \

_Py_DECREF_IMMORTAL_STAT_INC(); \

break; \

} \

_Py_DECREF_STAT_INC(); \

if (--op->ob_refcnt == 0) { \

_PyReftracerTrack(op, PyRefTracer_DESTROY); \

destructor dealloc = Py_TYPE(op)->tp_dealloc; \

(*dealloc)(op); \

} \

} while (0)

#undef _Py_DECREF_SPECIALIZED

#define _Py_DECREF_SPECIALIZED(arg, dealloc) \

do { \

PyObject *op = _PyObject_CAST(arg); \

if (_Py_IsImmortal(op)) { \

_Py_DECREF_IMMORTAL_STAT_INC(); \

break; \

} \

_Py_DECREF_STAT_INC(); \

if (--op->ob_refcnt == 0) { \

_PyReftracerTrack(op, PyRefTracer_DESTROY); \

destructor d = (destructor)(dealloc); \

d(op); \

} \

} while (0)

#else // Py_GIL_DISABLED

#undef Py_DECREF

#define Py_DECREF(arg) \

do { \

PyObject *op = _PyObject_CAST(arg); \

uint32_t local = _Py_atomic_load_uint32_relaxed(&op->ob_ref_local); \

if (local == _Py_IMMORTAL_REFCNT_LOCAL) { \

_Py_DECREF_IMMORTAL_STAT_INC(); \

break; \

} \

_Py_DECREF_STAT_INC(); \

if (_Py_IsOwnedByCurrentThread(op)) { \

local--; \

_Py_atomic_store_uint32_relaxed(&op->ob_ref_local, local); \

if (local == 0) { \

_Py_MergeZeroLocalRefcount(op); \

} \

else { \

_Py_DecRefShared(op); \

} \

} while (0)

#undef _Py_DECREF_SPECIALIZED

#define _Py_DECREF_SPECIALIZED(arg, dealloc) Py_DECREF(arg)

#endif

static void

check_invalid_reentrancy(void)

{

#if defined(Py_DEBUG) && defined(Py_GIL_DISABLED)

// In the free-threaded build, the interpreter must not be re-entered if

// the world-is-stopped. If so, that's a bug somewhere (quite likely in

// the painfully complex typeobject code).

PyInterpreterState *interp = _PyInterpreterState_GET();

assert(!interp->stoptheworld.world_stopped);

#endif

}

#ifdef Py_DEBUG

static void

dump_item(_PyStackRef item)

{

if (PyStackRef_IsNull(item)) {

printf("<NULL>");

return;

}

if (PyStackRef_IsMalformed(item)) {

printf("<INVALID>");

return;

}

if (PyStackRef_IsTaggedInt(item)) {

printf("%" PRId64, (int64_t)PyStackRef_UntagInt(item));

return;

}

PyObject *obj = PyStackRef_AsPyObjectBorrow(item);

if (obj == NULL) {

printf("<nil>");

return;

}

// Don't call __repr__(), it might recurse into the interpreter.

printf("<%s at %p>", Py_TYPE(obj)->tp_name, (void *)obj);

}

static void

dump_stack(_PyInterpreterFrame *frame, _PyStackRef *stack_pointer)

{

_PyFrame_SetStackPointer(frame, stack_pointer);

_PyStackRef *locals_base = _PyFrame_GetLocalsArray(frame);

_PyStackRef *stack_base = _PyFrame_Stackbase(frame);

PyObject *exc = PyErr_GetRaisedException();

printf(" locals=[");

for (_PyStackRef *ptr = locals_base; ptr < stack_base; ptr++) {

if (ptr != locals_base) {

printf(", ");

}

dump_item(*ptr);

}

printf("]\n");

if (stack_pointer < stack_base) {

printf(" stack=%d\n", (int)(stack_pointer-stack_base));

}

else {

printf(" stack=[");

for (_PyStackRef *ptr = stack_base; ptr < stack_pointer; ptr++) {

if (ptr != stack_base) {

printf(", ");

}

dump_item(*ptr);

}

printf("]\n");

}

fflush(stdout);

PyErr_SetRaisedException(exc);

_PyFrame_GetStackPointer(frame);

}

#if defined(_Py_TIER2) && !defined(_Py_JIT) && defined(Py_DEBUG)

static void

dump_cache_item(_PyStackRef cache, int position, int depth)

{

if (position < depth) {

dump_item(cache);

}

else {

printf("---");

}

#endif

static void

lltrace_instruction(_PyInterpreterFrame *frame,

_PyStackRef *stack_pointer,

_Py_CODEUNIT *next_instr,

int opcode,

int oparg)

{

int offset = 0;

if (frame->owner < FRAME_OWNED_BY_INTERPRETER) {

dump_stack(frame, stack_pointer);

offset = (int)(next_instr - _PyFrame_GetBytecode(frame));

}

const char *opname = _PyOpcode_OpName[opcode];

assert(opname != NULL);

if (OPCODE_HAS_ARG((int)_PyOpcode_Deopt[opcode])) {

printf("%d: %s %d\n", offset * 2, opname, oparg);

}

else {

printf("%d: %s\n", offset * 2, opname);

}

fflush(stdout);

}

static void

lltrace_resume_frame(_PyInterpreterFrame *frame)

{

PyObject *fobj = PyStackRef_AsPyObjectBorrow(frame->f_funcobj);

if (!PyStackRef_CodeCheck(frame->f_executable) ||

fobj == NULL ||

!PyFunction_Check(fobj)

) {

printf("\nResuming frame.\n");

return;

}

PyFunctionObject *f = (PyFunctionObject *)fobj;

PyObject *exc = PyErr_GetRaisedException();

PyObject *name = f->func_qualname;

if (name == NULL) {

name = f->func_name;

}

printf("\nResuming frame");

if (name) {

printf(" for ");

if (PyObject_Print(name, stdout, 0) < 0) {

PyErr_Clear();

}

if (f->func_module) {

printf(" in module ");

if (PyObject_Print(f->func_module, stdout, 0) < 0) {

PyErr_Clear();

}

printf("\n");

fflush(stdout);

PyErr_SetRaisedException(exc);

}

static int

maybe_lltrace_resume_frame(_PyInterpreterFrame *frame, PyObject *globals)

{

if (globals == NULL) {

return 0;

}

if (frame->owner >= FRAME_OWNED_BY_INTERPRETER) {

return 0;

}

int r = PyDict_Contains(globals, &_Py_ID(__lltrace__));

if (r < 0) {

PyErr_Clear();

return 0;

}

int lltrace = r * 5; // Levels 1-4 only trace uops

if (!lltrace) {

// Can also be controlled by environment variable

char *python_lltrace = Py_GETENV("PYTHON_LLTRACE");

if (python_lltrace != NULL && *python_lltrace >= '0') {

lltrace = *python_lltrace - '0'; // TODO: Parse an int and all that

}

if (lltrace >= 5) {

lltrace_resume_frame(frame);

}

return lltrace;

}

#endif

static void monitor_reraise(PyThreadState *tstate,

_PyInterpreterFrame *frame,

_Py_CODEUNIT *instr);

static int monitor_stop_iteration(PyThreadState *tstate,

_PyInterpreterFrame *frame,

_Py_CODEUNIT *instr,

PyObject *value);

static void monitor_unwind(PyThreadState *tstate,

_PyInterpreterFrame *frame,

_Py_CODEUNIT *instr);

static int monitor_handled(PyThreadState *tstate,

_PyInterpreterFrame *frame,

_Py_CODEUNIT *instr, PyObject *exc);

static void monitor_throw(PyThreadState *tstate,

_PyInterpreterFrame *frame,

_Py_CODEUNIT *instr);

static int get_exception_handler(PyCodeObject *, int, int*, int*, int*);

#ifdef HAVE_ERRNO_H

#include <errno.h>

#endif

typedef struct {

_PyInterpreterFrame frame;

_PyStackRef stack[1];

} _PyEntryFrame;

static int

do_monitor_exc(PyThreadState *tstate, _PyInterpreterFrame *frame,

_Py_CODEUNIT *instr, int event)

{

assert(event < _PY_MONITORING_UNGROUPED_EVENTS);

if (_PyFrame_GetCode(frame)->co_flags & CO_NO_MONITORING_EVENTS) {

return 0;

}

PyObject *exc = PyErr_GetRaisedException();

assert(exc != NULL);

int err = _Py_call_instrumentation_arg(tstate, event, frame, instr, exc);

if (err == 0) {

PyErr_SetRaisedException(exc);

}

else {

assert(PyErr_Occurred());

Py_DECREF(exc);

}

return err;

}

static inline bool

no_tools_for_global_event(PyThreadState *tstate, int event)

{

return tstate->interp->monitors.tools[event] == 0;

}

static inline bool

no_tools_for_local_event(PyThreadState *tstate, _PyInterpreterFrame *frame, int event)

{

assert(event < _PY_MONITORING_UNGROUPED_EVENTS);

_PyCoMonitoringData *data = _PyFrame_GetCode(frame)->_co_monitoring;

if (data) {

return data->active_monitors.tools[event] == 0;

}

else {

return no_tools_for_global_event(tstate, event);

}

static int

monitor_handled(PyThreadState *tstate,

_PyInterpreterFrame *frame,

_Py_CODEUNIT *instr, PyObject *exc)

{

if (no_tools_for_local_event(tstate, frame, PY_MONITORING_EVENT_EXCEPTION_HANDLED)) {

return 0;

}

return _Py_call_instrumentation_arg(tstate, PY_MONITORING_EVENT_EXCEPTION_HANDLED, frame, instr, exc);

}

static void

monitor_throw(PyThreadState *tstate,

_PyInterpreterFrame *frame,

_Py_CODEUNIT *instr)

{

if (no_tools_for_local_event(tstate, frame, PY_MONITORING_EVENT_PY_THROW)) {

return;

}

do_monitor_exc(tstate, frame, instr, PY_MONITORING_EVENT_PY_THROW);

}

static void

monitor_reraise(PyThreadState *tstate, _PyInterpreterFrame *frame,

_Py_CODEUNIT *instr)

{

if (no_tools_for_local_event(tstate, frame, PY_MONITORING_EVENT_RERAISE)) {

return;

}

do_monitor_exc(tstate, frame, instr, PY_MONITORING_EVENT_RERAISE);

}

static int

monitor_stop_iteration(PyThreadState *tstate, _PyInterpreterFrame *frame,

_Py_CODEUNIT *instr, PyObject *value)

{

if (no_tools_for_local_event(tstate, frame, PY_MONITORING_EVENT_STOP_ITERATION)) {

return 0;

}

assert(!PyErr_Occurred());

PyErr_SetObject(PyExc_StopIteration, value);

int res = do_monitor_exc(tstate, frame, instr, PY_MONITORING_EVENT_STOP_ITERATION);

if (res < 0) {

return res;

}

PyErr_SetRaisedException(NULL);

return 0;

}

static void

monitor_unwind(PyThreadState *tstate,

_PyInterpreterFrame *frame,

_Py_CODEUNIT *instr)

{

if (no_tools_for_local_event(tstate, frame, PY_MONITORING_EVENT_PY_UNWIND)) {

return;

}

do_monitor_exc(tstate, frame, instr, PY_MONITORING_EVENT_PY_UNWIND);

}

static inline unsigned char *

scan_back_to_entry_start(unsigned char *p) {

for (; (p[0]&128) == 0; p--);

return p;

}

static inline unsigned char *

skip_to_next_entry(unsigned char *p, unsigned char *end) {

while (p < end && ((p[0] & 128) == 0)) {

p++;

}

return p;

}

#define MAX_LINEAR_SEARCH 40

static Py_NO_INLINE int

get_exception_handler(PyCodeObject *code, int index, int *level, int *handler, int *lasti)

{

unsigned char *start = (unsigned char *)PyBytes_AS_STRING(code->co_exceptiontable);

unsigned char *end = start + PyBytes_GET_SIZE(code->co_exceptiontable);

/* Invariants:

* start_table == end_table OR

* start_table points to a legal entry and end_table points

* beyond the table or to a legal entry that is after index.

if (end - start > MAX_LINEAR_SEARCH) {

int offset;

parse_varint(start, &offset);

if (offset > index) {

return 0;

}

do {

unsigned char * mid = start + ((end-start)>>1);

mid = scan_back_to_entry_start(mid);

parse_varint(mid, &offset);

if (offset > index) {

end = mid;

}

else {

start = mid;

}

} while (end - start > MAX_LINEAR_SEARCH);

}

unsigned char *scan = start;

while (scan < end) {

int start_offset, size;

scan = parse_varint(scan, &start_offset);

if (start_offset > index) {

break;

}

scan = parse_varint(scan, &size);

if (start_offset + size > index) {

scan = parse_varint(scan, handler);

int depth_and_lasti;

parse_varint(scan, &depth_and_lasti);

*level = depth_and_lasti >> 1;

*lasti = depth_and_lasti & 1;

return 1;

}

scan = skip_to_next_entry(scan, end);

}

return 0;

}

#ifdef Py_DEBUG

#define ASSERT_WITHIN_STACK_BOUNDS(F, L) _Py_assert_within_stack_bounds(frame, stack_pointer, (F), (L))

#else

#define ASSERT_WITHIN_STACK_BOUNDS(F, L) (void)0

#endif

/* 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);

exc = exc_info->exc_value;

if (Py_IsNone(exc) || exc == NULL) {

_PyErr_SetString(tstate, PyExc_RuntimeError,

"No active exception to reraise");

return 0;

}

Py_INCREF(exc);

assert(PyExceptionInstance_Check(exc));

_PyErr_SetRaisedException(tstate, exc);

return 1;

}

/* We support the following forms of raise:

raise

raise <instance>

raise <type> */

if (PyExceptionClass_Check(exc)) {

type = exc;

value = _PyObject_CallNoArgs(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_CallNoArgs(cause);

if (fixed_cause == NULL)

goto raise_error;

if (!PyExceptionInstance_Check(fixed_cause)) {

_PyErr_Format(tstate, PyExc_TypeError,

"calling %R should have returned an instance of "

"BaseException, not %R",

cause, Py_TYPE(fixed_cause));

Py_DECREF(fixed_cause);

goto raise_error;

}

Py_DECREF(cause);

}

else if (PyExceptionInstance_Check(cause)) {

fixed_cause = cause;

}

else if (Py_IsNone(cause)) {

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;

}

/* Disable unused label warnings. They are handy for debugging, even

if computed gotos aren't used. */

/* TBD - what about other compilers? */

#if defined(__GNUC__) || defined(__clang__)

# pragma GCC diagnostic push

# pragma GCC diagnostic ignored "-Wunused-label"

#elif defined(_MSC_VER) /* MS_WINDOWS */

# pragma warning(push)

# pragma warning(disable:4102)

#endif

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