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ceval.c
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/* Execute compiled code */
#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"
#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_intrinsics.h"
#include "pycore_jit.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"
#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_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
#endif
#ifdef Py_DEBUG
static void
dump_item(_PyStackRef item)
{
if (PyStackRef_IsNull(item)) {
printf("<NULL>");
return;
}
PyObject *obj = PyStackRef_AsPyObjectBorrow(item);
if (obj == NULL) {
printf("<nil>");
return;
}
if (
obj == Py_None
|| PyBool_Check(obj)
|| PyLong_CheckExact(obj)
|| PyFloat_CheckExact(obj)
|| PyUnicode_CheckExact(obj)
) {
if (PyObject_Print(obj, stdout, 0) == 0) {
return;
}
PyErr_Clear();
}
// 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");
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);
}
static void
lltrace_instruction(_PyInterpreterFrame *frame,
_PyStackRef *stack_pointer,
_Py_CODEUNIT *next_instr,
int opcode,
int oparg)
{
if (frame->owner >= FRAME_OWNED_BY_INTERPRETER) {
return;
}
dump_stack(frame, stack_pointer);
const char *opname = _PyOpcode_OpName[opcode];
assert(opname != NULL);
int offset = (int)(next_instr - _PyFrame_GetBytecode(frame));
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) {
return -1;
}
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*);
static _PyInterpreterFrame *
_PyEvalFramePushAndInit_Ex(PyThreadState *tstate, _PyStackRef func,
PyObject *locals, Py_ssize_t nargs, PyObject *callargs, PyObject *kwargs, _PyInterpreterFrame *previous);
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
int
Py_GetRecursionLimit(void)
{
PyInterpreterState *interp = _PyInterpreterState_GET();
return interp->ceval.recursion_limit;
}
void
Py_SetRecursionLimit(int new_limit)
{
PyInterpreterState *interp = _PyInterpreterState_GET();
_PyEval_StopTheWorld(interp);
interp->ceval.recursion_limit = new_limit;
_Py_FOR_EACH_TSTATE_BEGIN(interp, p) {
int depth = p->py_recursion_limit - p->py_recursion_remaining;
p->py_recursion_limit = new_limit;
p->py_recursion_remaining = new_limit - depth;
}
_Py_FOR_EACH_TSTATE_END(interp);
_PyEval_StartTheWorld(interp);
}
int
_Py_ReachedRecursionLimitWithMargin(PyThreadState *tstate, int margin_count)
{
uintptr_t here_addr = _Py_get_machine_stack_pointer();
_PyThreadStateImpl *_tstate = (_PyThreadStateImpl *)tstate;
if (here_addr > _tstate->c_stack_soft_limit + margin_count * PYOS_STACK_MARGIN_BYTES) {
return 0;
}
if (_tstate->c_stack_hard_limit == 0) {
_Py_InitializeRecursionLimits(tstate);
}
return here_addr <= _tstate->c_stack_soft_limit + margin_count * PYOS_STACK_MARGIN_BYTES;
}
void
_Py_EnterRecursiveCallUnchecked(PyThreadState *tstate)
{
uintptr_t here_addr = _Py_get_machine_stack_pointer();
_PyThreadStateImpl *_tstate = (_PyThreadStateImpl *)tstate;
if (here_addr < _tstate->c_stack_hard_limit) {
Py_FatalError("Unchecked stack overflow.");
}
}
#if defined(__s390x__)
# define Py_C_STACK_SIZE 320000
#elif defined(_WIN32)
// Don't define Py_C_STACK_SIZE, ask the O/S
#elif defined(__ANDROID__)
# define Py_C_STACK_SIZE 1200000
#elif defined(__sparc__)
# define Py_C_STACK_SIZE 1600000
#elif defined(__wasi__)
/* Web assembly has two stacks, so this isn't really the stack depth */
# define Py_C_STACK_SIZE 131072 // wasi-libc DEFAULT_STACK_SIZE
#elif defined(__hppa__) || defined(__powerpc64__)
# define Py_C_STACK_SIZE 2000000
#else
# define Py_C_STACK_SIZE 4000000
#endif
#if defined(__EMSCRIPTEN__)
// Temporary workaround to make `pthread_getattr_np` work on Emscripten.
// Emscripten 4.0.6 will contain a fix:
// https://github.com/emscripten-core/emscripten/pull/23887
#include "emscripten/stack.h"
#define pthread_attr_t workaround_pthread_attr_t
#define pthread_getattr_np workaround_pthread_getattr_np
#define pthread_attr_getguardsize workaround_pthread_attr_getguardsize
#define pthread_attr_getstack workaround_pthread_attr_getstack
#define pthread_attr_destroy workaround_pthread_attr_destroy
typedef struct {
void *_a_stackaddr;
size_t _a_stacksize, _a_guardsize;
} pthread_attr_t;
extern __attribute__((__visibility__("hidden"))) unsigned __default_guardsize;
// Modified version of pthread_getattr_np from the upstream PR.
int pthread_getattr_np(pthread_t thread, pthread_attr_t *attr) {
attr->_a_stackaddr = (void*)emscripten_stack_get_base();
attr->_a_stacksize = emscripten_stack_get_base() - emscripten_stack_get_end();
attr->_a_guardsize = __default_guardsize;
return 0;
}
// These three functions copied without any changes from Emscripten libc.
int pthread_attr_getguardsize(const pthread_attr_t *restrict a, size_t *restrict size)
{
*size = a->_a_guardsize;
return 0;
}
int pthread_attr_getstack(const pthread_attr_t *restrict a, void **restrict addr, size_t *restrict size)
{
/// XXX musl is not standard-conforming? It should not report EINVAL if _a_stackaddr is zero, and it should
/// report EINVAL if a is null: http://pubs.opengroup.org/onlinepubs/009695399/functions/pthread_attr_getstack.html
if (!a) return EINVAL;
// if (!a->_a_stackaddr)
// return EINVAL;
*size = a->_a_stacksize;
*addr = (void *)(a->_a_stackaddr - *size);
return 0;
}
int pthread_attr_destroy(pthread_attr_t *a)
{
return 0;
}
#endif
void
_Py_InitializeRecursionLimits(PyThreadState *tstate)
{
_PyThreadStateImpl *_tstate = (_PyThreadStateImpl *)tstate;
#ifdef WIN32
ULONG_PTR low, high;
GetCurrentThreadStackLimits(&low, &high);
_tstate->c_stack_top = (uintptr_t)high;
ULONG guarantee = 0;
SetThreadStackGuarantee(&guarantee);
_tstate->c_stack_hard_limit = ((uintptr_t)low) + guarantee + PYOS_STACK_MARGIN_BYTES;
_tstate->c_stack_soft_limit = _tstate->c_stack_hard_limit + PYOS_STACK_MARGIN_BYTES;
#else
uintptr_t here_addr = _Py_get_machine_stack_pointer();
# if defined(HAVE_PTHREAD_GETATTR_NP) && !defined(_AIX)
size_t stack_size, guard_size;
void *stack_addr;
pthread_attr_t attr;
int err = pthread_getattr_np(pthread_self(), &attr);
if (err == 0) {
err = pthread_attr_getguardsize(&attr, &guard_size);
err |= pthread_attr_getstack(&attr, &stack_addr, &stack_size);
err |= pthread_attr_destroy(&attr);
}
if (err == 0) {
uintptr_t base = ((uintptr_t)stack_addr) + guard_size;
_tstate->c_stack_top = base + stack_size;
#ifdef _Py_THREAD_SANITIZER
// Thread sanitizer crashes if we use a bit more than half the stack.
_tstate->c_stack_soft_limit = base + (stack_size / 2);
#else
_tstate->c_stack_soft_limit = base + PYOS_STACK_MARGIN_BYTES * 2;
#endif
_tstate->c_stack_hard_limit = base + PYOS_STACK_MARGIN_BYTES;
assert(_tstate->c_stack_soft_limit < here_addr);
assert(here_addr < _tstate->c_stack_top);
return;
}
# endif
_tstate->c_stack_top = _Py_SIZE_ROUND_UP(here_addr, 4096);
_tstate->c_stack_soft_limit = _tstate->c_stack_top - Py_C_STACK_SIZE;
_tstate->c_stack_hard_limit = _tstate->c_stack_top - (Py_C_STACK_SIZE + PYOS_STACK_MARGIN_BYTES);
#endif
}
/* The function _Py_EnterRecursiveCallTstate() only calls _Py_CheckRecursiveCall()
if the recursion_depth reaches recursion_limit. */
int
_Py_CheckRecursiveCall(PyThreadState *tstate, const char *where)
{
_PyThreadStateImpl *_tstate = (_PyThreadStateImpl *)tstate;
uintptr_t here_addr = _Py_get_machine_stack_pointer();
assert(_tstate->c_stack_soft_limit != 0);
if (_tstate->c_stack_hard_limit == 0) {
_Py_InitializeRecursionLimits(tstate);
}
if (here_addr >= _tstate->c_stack_soft_limit) {
return 0;
}
assert(_tstate->c_stack_hard_limit != 0);
if (here_addr < _tstate->c_stack_hard_limit) {
/* Overflowing while handling an overflow. Give up. */
int kbytes_used = (int)(_tstate->c_stack_top - here_addr)/1024;
char buffer[80];
snprintf(buffer, 80, "Unrecoverable stack overflow (used %d kB)%s", kbytes_used, where);
Py_FatalError(buffer);
}
if (tstate->recursion_headroom) {
return 0;
}
else {
int kbytes_used = (int)(_tstate->c_stack_top - here_addr)/1024;
tstate->recursion_headroom++;
_PyErr_Format(tstate, PyExc_RecursionError,
"Stack overflow (used %d kB)%s",
kbytes_used,
where);
tstate->recursion_headroom--;
return -1;
}
}
const binaryfunc _PyEval_BinaryOps[] = {
[NB_ADD] = PyNumber_Add,
[NB_AND] = PyNumber_And,
[NB_FLOOR_DIVIDE] = PyNumber_FloorDivide,
[NB_LSHIFT] = PyNumber_Lshift,
[NB_MATRIX_MULTIPLY] = PyNumber_MatrixMultiply,
[NB_MULTIPLY] = PyNumber_Multiply,
[NB_REMAINDER] = PyNumber_Remainder,
[NB_OR] = PyNumber_Or,
[NB_POWER] = _PyNumber_PowerNoMod,
[NB_RSHIFT] = PyNumber_Rshift,
[NB_SUBTRACT] = PyNumber_Subtract,
[NB_TRUE_DIVIDE] = PyNumber_TrueDivide,
[NB_XOR] = PyNumber_Xor,
[NB_INPLACE_ADD] = PyNumber_InPlaceAdd,
[NB_INPLACE_AND] = PyNumber_InPlaceAnd,
[NB_INPLACE_FLOOR_DIVIDE] = PyNumber_InPlaceFloorDivide,
[NB_INPLACE_LSHIFT] = PyNumber_InPlaceLshift,
[NB_INPLACE_MATRIX_MULTIPLY] = PyNumber_InPlaceMatrixMultiply,
[NB_INPLACE_MULTIPLY] = PyNumber_InPlaceMultiply,
[NB_INPLACE_REMAINDER] = PyNumber_InPlaceRemainder,
[NB_INPLACE_OR] = PyNumber_InPlaceOr,
[NB_INPLACE_POWER] = _PyNumber_InPlacePowerNoMod,
[NB_INPLACE_RSHIFT] = PyNumber_InPlaceRshift,
[NB_INPLACE_SUBTRACT] = PyNumber_InPlaceSubtract,
[NB_INPLACE_TRUE_DIVIDE] = PyNumber_InPlaceTrueDivide,
[NB_INPLACE_XOR] = PyNumber_InPlaceXor,
[NB_SUBSCR] = PyObject_GetItem,
};
const conversion_func _PyEval_ConversionFuncs[4] = {
[FVC_STR] = PyObject_Str,
[FVC_REPR] = PyObject_Repr,
[FVC_ASCII] = PyObject_ASCII
};
const _Py_SpecialMethod _Py_SpecialMethods[] = {
[SPECIAL___ENTER__] = {
.name = &_Py_ID(__enter__),
.error = "'%.200s' object does not support the "
"context manager protocol (missed __enter__ method)",
},
[SPECIAL___EXIT__] = {
.name = &_Py_ID(__exit__),
.error = "'%.200s' object does not support the "
"context manager protocol (missed __exit__ method)",
},
[SPECIAL___AENTER__] = {
.name = &_Py_ID(__aenter__),
.error = "'%.200s' object does not support the asynchronous "
"context manager protocol (missed __aenter__ method)",
},
[SPECIAL___AEXIT__] = {
.name = &_Py_ID(__aexit__),
.error = "'%.200s' object does not support the asynchronous "
"context manager protocol (missed __aexit__ method)",
}
};
const size_t _Py_FunctionAttributeOffsets[] = {
[MAKE_FUNCTION_CLOSURE] = offsetof(PyFunctionObject, func_closure),
[MAKE_FUNCTION_ANNOTATIONS] = offsetof(PyFunctionObject, func_annotations),
[MAKE_FUNCTION_KWDEFAULTS] = offsetof(PyFunctionObject, func_kwdefaults),
[MAKE_FUNCTION_DEFAULTS] = offsetof(PyFunctionObject, func_defaults),
[MAKE_FUNCTION_ANNOTATE] = offsetof(PyFunctionObject, func_annotate),
};
// PEP 634: Structural Pattern Matching
// Return a tuple of values corresponding to keys, with error checks for
// duplicate/missing keys.
PyObject *
_PyEval_MatchKeys(PyThreadState *tstate, PyObject *map, PyObject *keys)
{
assert(PyTuple_CheckExact(keys));
Py_ssize_t nkeys = PyTuple_GET_SIZE(keys);
if (!nkeys) {
// No keys means no items.
return PyTuple_New(0);
}
PyObject *seen = NULL;
PyObject *dummy = NULL;
PyObject *values = NULL;
PyObject *get = NULL;
// We use the two argument form of map.get(key, default) for two reasons:
// - Atomically check for a key and get its value without error handling.
// - Don't cause key creation or resizing in dict subclasses like
// collections.defaultdict that define __missing__ (or similar).
int meth_found = _PyObject_GetMethod(map, &_Py_ID(get), &get);
if (get == NULL) {
goto fail;
}
seen = PySet_New(NULL);
if (seen == NULL) {
goto fail;
}
// dummy = object()
dummy = _PyObject_CallNoArgs((PyObject *)&PyBaseObject_Type);
if (dummy == NULL) {
goto fail;
}
values = PyTuple_New(nkeys);
if (values == NULL) {
goto fail;
}
for (Py_ssize_t i = 0; i < nkeys; i++) {
PyObject *key = PyTuple_GET_ITEM(keys, i);
if (PySet_Contains(seen, key) || PySet_Add(seen, key)) {
if (!_PyErr_Occurred(tstate)) {
// Seen it before!
_PyErr_Format(tstate, PyExc_ValueError,
"mapping pattern checks duplicate key (%R)", key);
}
goto fail;
}
PyObject *args[] = { map, key, dummy };
PyObject *value = NULL;
if (meth_found) {
value = PyObject_Vectorcall(get, args, 3, NULL);
}
else {
value = PyObject_Vectorcall(get, &args[1], 2, NULL);
}
if (value == NULL) {
goto fail;
}
if (value == dummy) {
// key not in map!
Py_DECREF(value);
Py_DECREF(values);
// Return None:
values = Py_NewRef(Py_None);
goto done;
}
PyTuple_SET_ITEM(values, i, value);
}
// Success:
done:
Py_DECREF(get);
Py_DECREF(seen);
Py_DECREF(dummy);
return values;
fail:
Py_XDECREF(get);
Py_XDECREF(seen);
Py_XDECREF(dummy);
Py_XDECREF(values);
return NULL;
}
// Extract a named attribute from the subject, with additional bookkeeping to
// raise TypeErrors for repeated lookups. On failure, return NULL (with no
// error set). Use _PyErr_Occurred(tstate) to disambiguate.
static PyObject *
match_class_attr(PyThreadState *tstate, PyObject *subject, PyObject *type,
PyObject *name, PyObject *seen)
{
assert(PyUnicode_CheckExact(name));
assert(PySet_CheckExact(seen));
if (PySet_Contains(seen, name) || PySet_Add(seen, name)) {
if (!_PyErr_Occurred(tstate)) {
// Seen it before!
_PyErr_Format(tstate, PyExc_TypeError,
"%s() got multiple sub-patterns for attribute %R",
((PyTypeObject*)type)->tp_name, name);
}
return NULL;
}
PyObject *attr;
(void)PyObject_GetOptionalAttr(subject, name, &attr);
return attr;
}
// On success (match), return a tuple of extracted attributes. On failure (no
// match), return NULL. Use _PyErr_Occurred(tstate) to disambiguate.
PyObject*
_PyEval_MatchClass(PyThreadState *tstate, PyObject *subject, PyObject *type,
Py_ssize_t nargs, PyObject *kwargs)
{
if (!PyType_Check(type)) {
const char *e = "called match pattern must be a class";
_PyErr_Format(tstate, PyExc_TypeError, e);
return NULL;
}
assert(PyTuple_CheckExact(kwargs));
// First, an isinstance check:
if (PyObject_IsInstance(subject, type) <= 0) {
return NULL;
}
// So far so good:
PyObject *seen = PySet_New(NULL);
if (seen == NULL) {
return NULL;
}
PyObject *attrs = PyList_New(0);
if (attrs == NULL) {
Py_DECREF(seen);
return NULL;
}
// NOTE: From this point on, goto fail on failure:
PyObject *match_args = NULL;
// First, the positional subpatterns:
if (nargs) {
int match_self = 0;
if (PyObject_GetOptionalAttr(type, &_Py_ID(__match_args__), &match_args) < 0) {
goto fail;
}
if (match_args) {
if (!PyTuple_CheckExact(match_args)) {
const char *e = "%s.__match_args__ must be a tuple (got %s)";
_PyErr_Format(tstate, PyExc_TypeError, e,
((PyTypeObject *)type)->tp_name,
Py_TYPE(match_args)->tp_name);
goto fail;
}
}
else {
// _Py_TPFLAGS_MATCH_SELF is only acknowledged if the type does not
// define __match_args__. This is natural behavior for subclasses:
// it's as if __match_args__ is some "magic" value that is lost as
// soon as they redefine it.
match_args = PyTuple_New(0);
match_self = PyType_HasFeature((PyTypeObject*)type,
_Py_TPFLAGS_MATCH_SELF);
}
assert(PyTuple_CheckExact(match_args));
Py_ssize_t allowed = match_self ? 1 : PyTuple_GET_SIZE(match_args);
if (allowed < nargs) {
const char *plural = (allowed == 1) ? "" : "s";
_PyErr_Format(tstate, PyExc_TypeError,
"%s() accepts %d positional sub-pattern%s (%d given)",
((PyTypeObject*)type)->tp_name,
allowed, plural, nargs);
goto fail;
}
if (match_self) {
// Easy. Copy the subject itself, and move on to kwargs.
if (PyList_Append(attrs, subject) < 0) {
goto fail;
}
}
else {
for (Py_ssize_t i = 0; i < nargs; i++) {
PyObject *name = PyTuple_GET_ITEM(match_args, i);
if (!PyUnicode_CheckExact(name)) {
_PyErr_Format(tstate, PyExc_TypeError,
"__match_args__ elements must be strings "
"(got %s)", Py_TYPE(name)->tp_name);
goto fail;
}
PyObject *attr = match_class_attr(tstate, subject, type, name,
seen);
if (attr == NULL) {
goto fail;
}
if (PyList_Append(attrs, attr) < 0) {
Py_DECREF(attr);
goto fail;
}
Py_DECREF(attr);
}
}
Py_CLEAR(match_args);
}
// Finally, the keyword subpatterns:
for (Py_ssize_t i = 0; i < PyTuple_GET_SIZE(kwargs); i++) {
PyObject *name = PyTuple_GET_ITEM(kwargs, i);
PyObject *attr = match_class_attr(tstate, subject, type, name, seen);
if (attr == NULL) {
goto fail;
}
if (PyList_Append(attrs, attr) < 0) {
Py_DECREF(attr);
goto fail;
}
Py_DECREF(attr);
}
Py_SETREF(attrs, PyList_AsTuple(attrs));
Py_DECREF(seen);
return attrs;
fail:
// We really don't care whether an error was raised or not... that's our
// caller's problem. All we know is that the match failed.
Py_XDECREF(match_args);
Py_DECREF(seen);
Py_DECREF(attrs);
return NULL;
}
static int do_raise(PyThreadState *tstate, PyObject *exc, PyObject *cause);
PyObject *
PyEval_EvalCode(PyObject *co, PyObject *globals, PyObject *locals)
{
PyThreadState *tstate = _PyThreadState_GET();
if (locals == NULL) {
locals = globals;
}
PyObject *builtins = _PyDict_LoadBuiltinsFromGlobals(globals);
if (builtins == NULL) {
return NULL;
}
PyFrameConstructor desc = {
.fc_globals = globals,
.fc_builtins = builtins,
.fc_name = ((PyCodeObject *)co)->co_name,
.fc_qualname = ((PyCodeObject *)co)->co_name,
.fc_code = co,
.fc_defaults = NULL,
.fc_kwdefaults = NULL,
.fc_closure = NULL
};
PyFunctionObject *func = _PyFunction_FromConstructor(&desc);
_Py_DECREF_BUILTINS(builtins);
if (func == NULL) {
return NULL;
}
EVAL_CALL_STAT_INC(EVAL_CALL_LEGACY);
PyObject *res = _PyEval_Vector(tstate, func, locals, NULL, 0, NULL);
Py_DECREF(func);
return res;
}
/* Interpreter main loop */
PyObject *
PyEval_EvalFrame(PyFrameObject *f)
{
/* Function kept for backward compatibility */
PyThreadState *tstate = _PyThreadState_GET();
return _PyEval_EvalFrame(tstate, f->f_frame, 0);
}
PyObject *
PyEval_EvalFrameEx(PyFrameObject *f, int throwflag)
{
PyThreadState *tstate = _PyThreadState_GET();
return _PyEval_EvalFrame(tstate, f->f_frame, throwflag);
}
#include "ceval_macros.h"
int _Py_CheckRecursiveCallPy(
PyThreadState *tstate)
{
if (tstate->recursion_headroom) {
if (tstate->py_recursion_remaining < -50) {
/* Overflowing while handling an overflow. Give up. */
Py_FatalError("Cannot recover from Python stack overflow.");
}
}
else {
if (tstate->py_recursion_remaining <= 0) {
tstate->recursion_headroom++;
_PyErr_Format(tstate, PyExc_RecursionError,
"maximum recursion depth exceeded");
tstate->recursion_headroom--;
return -1;
}
}
return 0;
}
static const _Py_CODEUNIT _Py_INTERPRETER_TRAMPOLINE_INSTRUCTIONS[] = {
/* Put a NOP at the start, so that the IP points into
* the code, rather than before it */
{ .op.code = NOP, .op.arg = 0 },
{ .op.code = INTERPRETER_EXIT, .op.arg = 0 }, /* reached on return */
{ .op.code = NOP, .op.arg = 0 },
{ .op.code = INTERPRETER_EXIT, .op.arg = 0 }, /* reached on yield */
{ .op.code = RESUME, .op.arg = RESUME_OPARG_DEPTH1_MASK | RESUME_AT_FUNC_START }
};
#ifdef Py_DEBUG
extern void _PyUOpPrint(const _PyUOpInstruction *uop);
#endif
/* Disable unused label warnings. They are handy for debugging, even
if computed gotos aren't used. */
/* TBD - what about other compilers? */
#if defined(__GNUC__)
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wunused-label"
#elif defined(_MSC_VER) /* MS_WINDOWS */
# pragma warning(push)
# pragma warning(disable:4102)
#endif
PyObject **
_PyObjectArray_FromStackRefArray(_PyStackRef *input, Py_ssize_t nargs, PyObject **scratch)
{
PyObject **result;
if (nargs > MAX_STACKREF_SCRATCH) {
// +1 in case PY_VECTORCALL_ARGUMENTS_OFFSET is set.
result = PyMem_Malloc((nargs + 1) * sizeof(PyObject *));
if (result == NULL) {
return NULL;
}
result++;
}
else {
result = scratch;
}
for (int i = 0; i < nargs; i++) {
result[i] = PyStackRef_AsPyObjectBorrow(input[i]);
}
return result;
}
void
_PyObjectArray_Free(PyObject **array, PyObject **scratch)
{
if (array != scratch) {
PyMem_Free(array);
}
}
/* _PyEval_EvalFrameDefault is too large to optimize for speed with PGO on MSVC.
*/
#if (defined(_MSC_VER) && \
(_MSC_VER < 1943) && \
defined(_Py_USING_PGO))
#define DO_NOT_OPTIMIZE_INTERP_LOOP
#endif
#ifdef DO_NOT_OPTIMIZE_INTERP_LOOP
# pragma optimize("t", off)
/* This setting is reversed below following _PyEval_EvalFrameDefault */
#endif
#if Py_TAIL_CALL_INTERP
#include "opcode_targets.h"
#include "generated_cases.c.h"
#endif
PyObject* _Py_HOT_FUNCTION
_PyEval_EvalFrameDefault(PyThreadState *tstate, _PyInterpreterFrame *frame, int throwflag)
{
_Py_EnsureTstateNotNULL(tstate);
CALL_STAT_INC(pyeval_calls);
#if USE_COMPUTED_GOTOS && !Py_TAIL_CALL_INTERP
/* Import the static jump table */
#include "opcode_targets.h"
#endif
#ifdef Py_STATS
int lastopcode = 0;
#endif
#if !Py_TAIL_CALL_INTERP
uint8_t opcode; /* Current opcode */
int oparg; /* Current opcode argument, if any */
assert(tstate->current_frame == NULL || tstate->current_frame->stackpointer != NULL);
#endif
_PyInterpreterFrame entry_frame;
if (_Py_EnterRecursiveCallTstate(tstate, "")) {
assert(frame->owner != FRAME_OWNED_BY_INTERPRETER);
_PyEval_FrameClearAndPop(tstate, frame);
return NULL;
}
/* Local "register" variables.
* These are cached values from the frame and code object. */
_Py_CODEUNIT *next_instr;
_PyStackRef *stack_pointer;
#if defined(Py_DEBUG) && !defined(Py_STACKREF_DEBUG)
/* Set these to invalid but identifiable values for debugging. */
entry_frame.f_funcobj = (_PyStackRef){.bits = 0xaaa0};
entry_frame.f_locals = (PyObject*)0xaaa1;
entry_frame.frame_obj = (PyFrameObject*)0xaaa2;
entry_frame.f_globals = (PyObject*)0xaaa3;
entry_frame.f_builtins = (PyObject*)0xaaa4;
#endif
entry_frame.f_executable = PyStackRef_None;
entry_frame.instr_ptr = (_Py_CODEUNIT *)_Py_INTERPRETER_TRAMPOLINE_INSTRUCTIONS + 1;
entry_frame.stackpointer = entry_frame.localsplus;