cpython/Python/specialize.c at main · python/cpython · GitHub

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#include "Python.h"

#include "opcode.h"

#include "pycore_bytesobject.h" // _PyBytes_Concat

#include "pycore_code.h"

#include "pycore_critical_section.h"

#include "pycore_descrobject.h" // _PyMethodWrapper_Type

#include "pycore_dict.h" // DICT_KEYS_UNICODE

#include "pycore_function.h" // _PyFunction_GetVersionForCurrentState()

#include "pycore_interpframe.h" // FRAME_SPECIALS_SIZE

#include "pycore_lazyimportobject.h" // PyLazyImport_CheckExact

#include "pycore_list.h" // _PyListIterObject, _PyList_Concat

#include "pycore_tuple.h" // _PyTuple_Concat

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

#include "pycore_moduleobject.h"

#include "pycore_object.h"

#include "pycore_opcode_metadata.h" // _PyOpcode_Caches

#include "pycore_uop_metadata.h" // _PyOpcode_uop_name

#include "pycore_uop_ids.h" // MAX_UOP_ID

#include "pycore_opcode_utils.h" // RESUME_AT_FUNC_START

#include "pycore_pylifecycle.h" // _PyOS_URandomNonblock()

#include "pycore_runtime.h" // _Py_ID()

#include "pycore_unicodeobject.h" // _PyUnicodeASCIIIter_Type

#include <stdlib.h> // rand()

/* For guidance on adding or extending families of instructions see

* InternalDocs/interpreter.md `Specialization` section.

#if Py_STATS

#define SPECIALIZATION_FAIL(opcode, kind) \

do { \

PyStats *s = _PyStats_GET(); \

if (s) { \

int _kind = (kind); \

assert(_kind < SPECIALIZATION_FAILURE_KINDS); \

s->opcode_stats[opcode].specialization.failure_kinds[_kind]++; \

} \

} while (0)

#else

# define SPECIALIZATION_FAIL(opcode, kind) ((void)0)

#endif // Py_STATS

static void

fixup_getiter(_Py_CODEUNIT *instruction, int flags)

{

// Compiler can't know if types.coroutine() will be called,

// so fix up here

if (instruction->op.arg) {

if (flags & (CO_COROUTINE | CO_ITERABLE_COROUTINE)) {

instruction->op.arg = GET_ITER_YIELD_FROM_NO_CHECK;

}

else {

instruction->op.arg = GET_ITER_YIELD_FROM_CORO_CHECK;

}

// Initialize warmup counters and optimize instructions. This cannot fail.

void

_PyCode_Quicken(_Py_CODEUNIT *instructions, Py_ssize_t size, int enable_counters, int flags)

{

#if ENABLE_SPECIALIZATION

_Py_BackoffCounter jump_counter, adaptive_counter, resume_counter;

if (enable_counters) {

PyThreadState *tstate = _PyThreadState_GET();

PyInterpreterState *interp = tstate->interp;

jump_counter = initial_jump_backoff_counter(&interp->opt_config);

adaptive_counter = adaptive_counter_warmup();

resume_counter = initial_resume_backoff_counter(&interp->opt_config);

}

else {

jump_counter = initial_unreachable_backoff_counter();

adaptive_counter = initial_unreachable_backoff_counter();

resume_counter = initial_unreachable_backoff_counter();

}

int opcode = 0;

int oparg = 0;

/* The last code unit cannot have a cache, so we don't need to check it */

for (Py_ssize_t i = 0; i < size-1; i++) {

opcode = instructions[i].op.code;

int caches = _PyOpcode_Caches[opcode];

oparg = (oparg << 8) | instructions[i].op.arg;

if (opcode == GET_ITER) {

fixup_getiter(&instructions[i], flags);

}

if (caches) {

// The initial value depends on the opcode

switch (opcode) {

case JUMP_BACKWARD:

instructions[i + 1].counter = jump_counter;

break;

case RESUME:

instructions[i + 1].counter = resume_counter;

break;

case POP_JUMP_IF_FALSE:

case POP_JUMP_IF_TRUE:

case POP_JUMP_IF_NONE:

case POP_JUMP_IF_NOT_NONE:

instructions[i + 1].cache = 0x5555; // Alternating 0, 1 bits

break;

default:

instructions[i + 1].counter = adaptive_counter;

break;

}

i += caches;

}

if (opcode != EXTENDED_ARG) {

oparg = 0;

}

#else

for (Py_ssize_t i = 0; i < size-1; i++) {

int opcode = instructions[i].op.code;

if (opcode == GET_ITER) {

fixup_getiter(&instructions[i], flags);

}

i += _PyOpcode_Caches[opcode];

}

#endif /* ENABLE_SPECIALIZATION */

}

#define SIMPLE_FUNCTION 0

/* Common */

#define SPEC_FAIL_OTHER 0

#define SPEC_FAIL_NO_DICT 1

#define SPEC_FAIL_OVERRIDDEN 2

#define SPEC_FAIL_OUT_OF_VERSIONS 3

#define SPEC_FAIL_OUT_OF_RANGE 4

#define SPEC_FAIL_EXPECTED_ERROR 5

#define SPEC_FAIL_WRONG_NUMBER_ARGUMENTS 6

#define SPEC_FAIL_CODE_COMPLEX_PARAMETERS 7

#define SPEC_FAIL_CODE_NOT_OPTIMIZED 8

#define SPEC_FAIL_LOAD_GLOBAL_NON_DICT 17

#define SPEC_FAIL_LOAD_GLOBAL_NON_STRING_OR_SPLIT 18

/* Super */

#define SPEC_FAIL_SUPER_BAD_CLASS 9

#define SPEC_FAIL_SUPER_SHADOWED 10

/* Attributes */

#define SPEC_FAIL_ATTR_OVERRIDING_DESCRIPTOR 9

#define SPEC_FAIL_ATTR_NON_OVERRIDING_DESCRIPTOR 10

#define SPEC_FAIL_ATTR_NOT_DESCRIPTOR 11

#define SPEC_FAIL_ATTR_METHOD 12

#define SPEC_FAIL_ATTR_MUTABLE_CLASS 13

#define SPEC_FAIL_ATTR_PROPERTY 14

#define SPEC_FAIL_ATTR_NON_OBJECT_SLOT 15

#define SPEC_FAIL_ATTR_READ_ONLY 16

#define SPEC_FAIL_ATTR_AUDITED_SLOT 17

#define SPEC_FAIL_ATTR_NOT_MANAGED_DICT 18

#define SPEC_FAIL_ATTR_NON_STRING 19

#define SPEC_FAIL_ATTR_MODULE_ATTR_NOT_FOUND 20

#define SPEC_FAIL_ATTR_SHADOWED 21

#define SPEC_FAIL_ATTR_BUILTIN_CLASS_METHOD 22

#define SPEC_FAIL_ATTR_CLASS_METHOD_OBJ 23

#define SPEC_FAIL_ATTR_OBJECT_SLOT 24

#define SPEC_FAIL_ATTR_MODULE_LAZY_VALUE 25

#define SPEC_FAIL_ATTR_INSTANCE_ATTRIBUTE 26

#define SPEC_FAIL_ATTR_METACLASS_ATTRIBUTE 27

#define SPEC_FAIL_ATTR_PROPERTY_NOT_PY_FUNCTION 28

#define SPEC_FAIL_ATTR_NOT_IN_KEYS 29

#define SPEC_FAIL_ATTR_NOT_IN_DICT 30

#define SPEC_FAIL_ATTR_CLASS_ATTR_SIMPLE 31

#define SPEC_FAIL_ATTR_CLASS_ATTR_DESCRIPTOR 32

#define SPEC_FAIL_ATTR_BUILTIN_CLASS_METHOD_OBJ 33

#define SPEC_FAIL_ATTR_METACLASS_OVERRIDDEN 34

#define SPEC_FAIL_ATTR_SPLIT_DICT 35

#define SPEC_FAIL_ATTR_DESCR_NOT_DEFERRED 36

#define SPEC_FAIL_ATTR_SLOT_AFTER_ITEMS 37

/* Binary subscr and store subscr */

#define SPEC_FAIL_SUBSCR_ARRAY_INT 9

#define SPEC_FAIL_SUBSCR_ARRAY_SLICE 10

#define SPEC_FAIL_SUBSCR_LIST_SLICE 11

#define SPEC_FAIL_SUBSCR_BUFFER_INT 12

#define SPEC_FAIL_SUBSCR_BUFFER_SLICE 13

/* Store subscr */

#define SPEC_FAIL_SUBSCR_BYTEARRAY_INT 18

#define SPEC_FAIL_SUBSCR_BYTEARRAY_SLICE 19

#define SPEC_FAIL_SUBSCR_PY_SIMPLE 20

#define SPEC_FAIL_SUBSCR_PY_OTHER 21

#define SPEC_FAIL_SUBSCR_DICT_SUBCLASS_NO_OVERRIDE 22

#define SPEC_FAIL_SUBSCR_NOT_HEAP_TYPE 23

/* Binary op */

#define SPEC_FAIL_BINARY_OP_ADD_DIFFERENT_TYPES 9

#define SPEC_FAIL_BINARY_OP_ADD_OTHER 10

#define SPEC_FAIL_BINARY_OP_AND_DIFFERENT_TYPES 11

#define SPEC_FAIL_BINARY_OP_AND_INT 12

#define SPEC_FAIL_BINARY_OP_AND_OTHER 13

#define SPEC_FAIL_BINARY_OP_FLOOR_DIVIDE 14

#define SPEC_FAIL_BINARY_OP_LSHIFT 15

#define SPEC_FAIL_BINARY_OP_MATRIX_MULTIPLY 16

#define SPEC_FAIL_BINARY_OP_MULTIPLY_DIFFERENT_TYPES 17

#define SPEC_FAIL_BINARY_OP_MULTIPLY_OTHER 18

#define SPEC_FAIL_BINARY_OP_OR 19

#define SPEC_FAIL_BINARY_OP_POWER 20

#define SPEC_FAIL_BINARY_OP_REMAINDER 21

#define SPEC_FAIL_BINARY_OP_RSHIFT 22

#define SPEC_FAIL_BINARY_OP_SUBTRACT_DIFFERENT_TYPES 23

#define SPEC_FAIL_BINARY_OP_SUBTRACT_OTHER 24

#define SPEC_FAIL_BINARY_OP_TRUE_DIVIDE_DIFFERENT_TYPES 25

#define SPEC_FAIL_BINARY_OP_TRUE_DIVIDE_FLOAT 26

#define SPEC_FAIL_BINARY_OP_TRUE_DIVIDE_OTHER 27

#define SPEC_FAIL_BINARY_OP_XOR 28

#define SPEC_FAIL_BINARY_OP_OR_INT 29

#define SPEC_FAIL_BINARY_OP_OR_DIFFERENT_TYPES 30

#define SPEC_FAIL_BINARY_OP_XOR_INT 31

#define SPEC_FAIL_BINARY_OP_XOR_DIFFERENT_TYPES 32

#define SPEC_FAIL_BINARY_OP_SUBSCR 33

#define SPEC_FAIL_BINARY_OP_SUBSCR_LIST_SLICE 34

#define SPEC_FAIL_BINARY_OP_SUBSCR_TUPLE_SLICE 35

#define SPEC_FAIL_BINARY_OP_SUBSCR_STRING_SLICE 36

#define SPEC_FAIL_BINARY_OP_SUBSCR_NOT_HEAP_TYPE 37

#define SPEC_FAIL_BINARY_OP_SUBSCR_OTHER_SLICE 38

#define SPEC_FAIL_BINARY_OP_SUBSCR_MAPPINGPROXY 39

#define SPEC_FAIL_BINARY_OP_SUBSCR_RE_MATCH 40

#define SPEC_FAIL_BINARY_OP_SUBSCR_ARRAY 41

#define SPEC_FAIL_BINARY_OP_SUBSCR_DEQUE 42

#define SPEC_FAIL_BINARY_OP_SUBSCR_ENUMDICT 43

#define SPEC_FAIL_BINARY_OP_SUBSCR_STACKSUMMARY 44

#define SPEC_FAIL_BINARY_OP_SUBSCR_DEFAULTDICT 45

#define SPEC_FAIL_BINARY_OP_SUBSCR_COUNTER 46

#define SPEC_FAIL_BINARY_OP_SUBSCR_ORDEREDDICT 47

#define SPEC_FAIL_BINARY_OP_SUBSCR_BYTES 48

#define SPEC_FAIL_BINARY_OP_SUBSCR_STRUCTTIME 49

#define SPEC_FAIL_BINARY_OP_SUBSCR_RANGE 50

/* Calls */

#define SPEC_FAIL_CALL_INSTANCE_METHOD 11

#define SPEC_FAIL_CALL_CMETHOD 12

#define SPEC_FAIL_CALL_CFUNC_VARARGS 13

#define SPEC_FAIL_CALL_CFUNC_VARARGS_KEYWORDS 14

#define SPEC_FAIL_CALL_CFUNC_NOARGS 15

#define SPEC_FAIL_CALL_CFUNC_METHOD_FASTCALL_KEYWORDS 16

#define SPEC_FAIL_CALL_METH_DESCR_VARARGS 17

#define SPEC_FAIL_CALL_METH_DESCR_VARARGS_KEYWORDS 18

#define SPEC_FAIL_CALL_METH_DESCR_METHOD_FASTCALL_KEYWORDS 19

#define SPEC_FAIL_CALL_BAD_CALL_FLAGS 20

#define SPEC_FAIL_CALL_INIT_NOT_PYTHON 21

#define SPEC_FAIL_CALL_PEP_523 22

#define SPEC_FAIL_CALL_BOUND_METHOD 23

#define SPEC_FAIL_CALL_VECTORCALL 24

#define SPEC_FAIL_CALL_CLASS_MUTABLE 26

#define SPEC_FAIL_CALL_METHOD_WRAPPER 28

#define SPEC_FAIL_CALL_OPERATOR_WRAPPER 29

#define SPEC_FAIL_CALL_INIT_NOT_SIMPLE 30

#define SPEC_FAIL_CALL_METACLASS 31

#define SPEC_FAIL_CALL_INIT_NOT_INLINE_VALUES 32

/* COMPARE_OP */

#define SPEC_FAIL_COMPARE_OP_DIFFERENT_TYPES 12

#define SPEC_FAIL_COMPARE_OP_STRING 13

#define SPEC_FAIL_COMPARE_OP_BIG_INT 14

#define SPEC_FAIL_COMPARE_OP_BYTES 15

#define SPEC_FAIL_COMPARE_OP_TUPLE 16

#define SPEC_FAIL_COMPARE_OP_LIST 17

#define SPEC_FAIL_COMPARE_OP_SET 18

#define SPEC_FAIL_COMPARE_OP_BOOL 19

#define SPEC_FAIL_COMPARE_OP_BASEOBJECT 20

#define SPEC_FAIL_COMPARE_OP_FLOAT_LONG 21

#define SPEC_FAIL_COMPARE_OP_LONG_FLOAT 22

/* FOR_ITER and SEND */

#define SPEC_FAIL_ITER_GENERATOR 10

#define SPEC_FAIL_ITER_COROUTINE 11

#define SPEC_FAIL_ITER_ASYNC_GENERATOR 12

#define SPEC_FAIL_ITER_LIST 13

#define SPEC_FAIL_ITER_TUPLE 14

#define SPEC_FAIL_ITER_SET 15

#define SPEC_FAIL_ITER_STRING 16

#define SPEC_FAIL_ITER_BYTES 17

#define SPEC_FAIL_ITER_RANGE 18

#define SPEC_FAIL_ITER_ITERTOOLS 19

#define SPEC_FAIL_ITER_DICT_KEYS 20

#define SPEC_FAIL_ITER_DICT_ITEMS 21

#define SPEC_FAIL_ITER_DICT_VALUES 22

#define SPEC_FAIL_ITER_ENUMERATE 23

#define SPEC_FAIL_ITER_MAP 24

#define SPEC_FAIL_ITER_ZIP 25

#define SPEC_FAIL_ITER_SEQ_ITER 26

#define SPEC_FAIL_ITER_REVERSED_LIST 27

#define SPEC_FAIL_ITER_CALLABLE 28

#define SPEC_FAIL_ITER_ASCII_STRING 29

#define SPEC_FAIL_ITER_ASYNC_GENERATOR_SEND 30

#define SPEC_FAIL_ITER_SELF 31

// UNPACK_SEQUENCE

#define SPEC_FAIL_UNPACK_SEQUENCE_ITERATOR 9

#define SPEC_FAIL_UNPACK_SEQUENCE_SEQUENCE 10

// TO_BOOL

#define SPEC_FAIL_TO_BOOL_BYTEARRAY 9

#define SPEC_FAIL_TO_BOOL_BYTES 10

#define SPEC_FAIL_TO_BOOL_DICT 11

#define SPEC_FAIL_TO_BOOL_FLOAT 12

#define SPEC_FAIL_TO_BOOL_MAPPING 13

#define SPEC_FAIL_TO_BOOL_MEMORY_VIEW 14

#define SPEC_FAIL_TO_BOOL_NUMBER 15

#define SPEC_FAIL_TO_BOOL_SEQUENCE 16

#define SPEC_FAIL_TO_BOOL_SET 17

#define SPEC_FAIL_TO_BOOL_TUPLE 18

// CONTAINS_OP

#define SPEC_FAIL_CONTAINS_OP_STR 9

#define SPEC_FAIL_CONTAINS_OP_TUPLE 10

#define SPEC_FAIL_CONTAINS_OP_LIST 11

#define SPEC_FAIL_CONTAINS_OP_USER_CLASS 12

static inline int

set_opcode(_Py_CODEUNIT *instr, uint8_t opcode)

{

#ifdef Py_GIL_DISABLED

uint8_t old_op = _Py_atomic_load_uint8_relaxed(&instr->op.code);

if (old_op >= MIN_INSTRUMENTED_OPCODE) {

/* Lost race with instrumentation */

return 0;

}

if (!_Py_atomic_compare_exchange_uint8(&instr->op.code, &old_op, opcode)) {

/* Lost race with instrumentation */

assert(old_op >= MIN_INSTRUMENTED_OPCODE);

return 0;

}

return 1;

#else

instr->op.code = opcode;

return 1;

#endif

}

static inline void

set_counter(_Py_BackoffCounter *counter, _Py_BackoffCounter value)

{

FT_ATOMIC_STORE_UINT16_RELAXED(counter->value_and_backoff,

value.value_and_backoff);

}

static inline _Py_BackoffCounter

load_counter(_Py_BackoffCounter *counter)

{

_Py_BackoffCounter result = {

.value_and_backoff =

FT_ATOMIC_LOAD_UINT16_RELAXED(counter->value_and_backoff)};

return result;

}

static inline void

specialize(_Py_CODEUNIT *instr, uint8_t specialized_opcode)

{

assert(!PyErr_Occurred());

if (!set_opcode(instr, specialized_opcode)) {

STAT_INC(_PyOpcode_Deopt[specialized_opcode], failure);

SPECIALIZATION_FAIL(_PyOpcode_Deopt[specialized_opcode],

SPEC_FAIL_OTHER);

return;

}

STAT_INC(_PyOpcode_Deopt[specialized_opcode], success);

set_counter((_Py_BackoffCounter *)instr + 1, adaptive_counter_cooldown());

}

static inline void

unspecialize(_Py_CODEUNIT *instr)

{

assert(!PyErr_Occurred());

uint8_t opcode = FT_ATOMIC_LOAD_UINT8_RELAXED(instr->op.code);

uint8_t generic_opcode = _PyOpcode_Deopt[opcode];

STAT_INC(generic_opcode, failure);

if (!set_opcode(instr, generic_opcode)) {

SPECIALIZATION_FAIL(generic_opcode, SPEC_FAIL_OTHER);

return;

}

_Py_BackoffCounter *counter = (_Py_BackoffCounter *)instr + 1;

_Py_BackoffCounter cur = load_counter(counter);

set_counter(counter, adaptive_counter_backoff(cur));

}

static int function_kind(PyCodeObject *code);

static bool function_check_args(PyObject *o, int expected_argcount, int opcode);

static uint32_t function_get_version(PyObject *o, int opcode);

#ifdef Py_GIL_DISABLED

static void

maybe_enable_deferred_ref_count(PyObject *op)

{

if (!_Py_IsOwnedByCurrentThread(op) && _PyObject_GC_IS_TRACKED(op)) {

// For module level variables that are heavily used from multiple

// threads, deferred reference counting provides good scaling

// benefits. The downside is that the object will only be deallocated

// by a GC run.

PyUnstable_Object_EnableDeferredRefcount(op);

}

#endif

static int

specialize_module_load_attr_lock_held(PyDictObject *dict, _Py_CODEUNIT *instr, PyObject *name)

{

_PyAttrCache *cache = (_PyAttrCache *)(instr + 1);

if (dict->ma_keys->dk_kind != DICT_KEYS_UNICODE) {

SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_ATTR_NON_STRING);

return -1;

}

PyObject *value;

Py_ssize_t index = _PyDict_LookupIndexAndValue(dict, name, &value);

if (value != NULL && PyLazyImport_CheckExact(value)) {

SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_ATTR_MODULE_LAZY_VALUE);

return -1;

}

assert(index != DKIX_ERROR);

if (index != (uint16_t)index) {

SPECIALIZATION_FAIL(LOAD_ATTR,

index == DKIX_EMPTY ?

SPEC_FAIL_ATTR_MODULE_ATTR_NOT_FOUND :

SPEC_FAIL_OUT_OF_RANGE);

return -1;

}

uint32_t keys_version = _PyDict_GetKeysVersionForCurrentState(

_PyInterpreterState_GET(), dict);

if (keys_version == 0) {

SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_OUT_OF_VERSIONS);

return -1;

}

#ifdef Py_GIL_DISABLED

maybe_enable_deferred_ref_count(value);

#endif

write_u32(cache->version, keys_version);

cache->index = (uint16_t)index;

specialize(instr, LOAD_ATTR_MODULE);

return 0;

}

static int

specialize_module_load_attr(

PyObject *owner, _Py_CODEUNIT *instr, PyObject *name)

{

PyModuleObject *m = (PyModuleObject *)owner;

assert((Py_TYPE(owner)->tp_flags & Py_TPFLAGS_MANAGED_DICT) == 0);

PyDictObject *dict = (PyDictObject *)m->md_dict;

if (dict == NULL) {

SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_NO_DICT);

return -1;

}

int result;

Py_BEGIN_CRITICAL_SECTION(dict);

result = specialize_module_load_attr_lock_held(dict, instr, name);

Py_END_CRITICAL_SECTION();

return result;

}

/* Attribute specialization */

Py_NO_INLINE void

_Py_Specialize_LoadSuperAttr(_PyStackRef global_super_st, _PyStackRef cls_st, _Py_CODEUNIT *instr, int load_method) {

PyObject *global_super = PyStackRef_AsPyObjectBorrow(global_super_st);

PyObject *cls = PyStackRef_AsPyObjectBorrow(cls_st);

assert(ENABLE_SPECIALIZATION);

assert(_PyOpcode_Caches[LOAD_SUPER_ATTR] == INLINE_CACHE_ENTRIES_LOAD_SUPER_ATTR);

if (global_super != (PyObject *)&PySuper_Type) {

SPECIALIZATION_FAIL(LOAD_SUPER_ATTR, SPEC_FAIL_SUPER_SHADOWED);

goto fail;

}

if (!PyType_Check(cls)) {

SPECIALIZATION_FAIL(LOAD_SUPER_ATTR, SPEC_FAIL_SUPER_BAD_CLASS);

goto fail;

}

uint8_t load_code = load_method ? LOAD_SUPER_ATTR_METHOD : LOAD_SUPER_ATTR_ATTR;

specialize(instr, load_code);

return;

fail:

unspecialize(instr);

}

typedef enum {

OVERRIDING, /* Is an overriding descriptor, and will remain so. */

METHOD, /* Attribute has Py_TPFLAGS_METHOD_DESCRIPTOR set */

PROPERTY, /* Is a property */

OBJECT_SLOT, /* Is an object slot descriptor */

OTHER_SLOT, /* Is a slot descriptor of another type */

NON_OVERRIDING, /* Is another non-overriding descriptor, and is an instance of an immutable class*/

BUILTIN_CLASSMETHOD, /* Builtin methods with METH_CLASS */

PYTHON_CLASSMETHOD, /* Python classmethod(func) object */

NON_DESCRIPTOR, /* Is not a descriptor, and is an instance of an immutable class */

MUTABLE, /* Instance of a mutable class; might, or might not, be a descriptor */

ABSENT, /* Attribute is not present on the class */

DUNDER_CLASS, /* __class__ attribute */

GETSET_OVERRIDDEN, /* __getattribute__ or __setattr__ has been overridden */

GETATTRIBUTE_IS_PYTHON_FUNCTION /* Descriptor requires calling a Python __getattribute__ */

} DescriptorClassification;

static DescriptorClassification

classify_descriptor(PyObject *descriptor, bool has_getattr)

{

if (descriptor == NULL) {

return ABSENT;

}

PyTypeObject *desc_cls = Py_TYPE(descriptor);

if (!(desc_cls->tp_flags & Py_TPFLAGS_IMMUTABLETYPE)) {

return MUTABLE;

}

if (desc_cls->tp_descr_set) {

if (desc_cls == &PyMemberDescr_Type) {

PyMemberDescrObject *member = (PyMemberDescrObject *)descriptor;

struct PyMemberDef *dmem = member->d_member;

if (dmem->type == Py_T_OBJECT_EX || dmem->type == _Py_T_OBJECT) {

return OBJECT_SLOT;

}

return OTHER_SLOT;

}

if (desc_cls == &PyProperty_Type) {

/* We can't detect at runtime whether an attribute exists

with property. So that means we may have to call

__getattr__. */

return has_getattr ? GETSET_OVERRIDDEN : PROPERTY;

}

return OVERRIDING;

}

if (desc_cls->tp_descr_get) {

if (desc_cls->tp_flags & Py_TPFLAGS_METHOD_DESCRIPTOR) {

return METHOD;

}

if (Py_IS_TYPE(descriptor, &PyClassMethodDescr_Type)) {

return BUILTIN_CLASSMETHOD;

}

if (Py_IS_TYPE(descriptor, &PyClassMethod_Type)) {

return PYTHON_CLASSMETHOD;

}

return NON_OVERRIDING;

}

return NON_DESCRIPTOR;

}

static bool

descriptor_is_class(PyObject *descriptor, PyObject *name)

{

return ((PyUnicode_CompareWithASCIIString(name, "__class__") == 0) &&

(descriptor == _PyType_Lookup(&PyBaseObject_Type, name)));

}

static DescriptorClassification

analyze_descriptor_load(PyTypeObject *type, PyObject *name, PyObject **descr, unsigned int *tp_version) {

bool has_getattr = false;

bool have_ga_version = false;

unsigned int ga_version;

getattrofunc getattro_slot = type->tp_getattro;

if (getattro_slot == PyObject_GenericGetAttr) {

/* Normal attribute lookup; */

has_getattr = false;

}

else if (getattro_slot == _Py_slot_tp_getattr_hook ||

getattro_slot == _Py_slot_tp_getattro) {

/* One or both of __getattribute__ or __getattr__ may have been

overridden See typeobject.c for why these functions are special. */

PyObject *getattribute = _PyType_LookupRefAndVersion(type,

&_Py_ID(__getattribute__), &ga_version);

have_ga_version = true;

PyInterpreterState *interp = _PyInterpreterState_GET();

bool has_custom_getattribute = getattribute != NULL &&

getattribute != interp->callable_cache.object__getattribute__;

PyObject *getattr = _PyType_Lookup(type, &_Py_ID(__getattr__));

has_getattr = getattr != NULL;

if (has_custom_getattribute) {

if (!has_getattr &&

Py_IS_TYPE(getattribute, &PyFunction_Type)) {

*descr = getattribute;

*tp_version = ga_version;

return GETATTRIBUTE_IS_PYTHON_FUNCTION;

}

/* Potentially both __getattr__ and __getattribute__ are set.

Too complicated */

Py_DECREF(getattribute);

*descr = NULL;

*tp_version = ga_version;

return GETSET_OVERRIDDEN;

}

/* Potentially has __getattr__ but no custom __getattribute__.

Fall through to usual descriptor analysis.

Usual attribute lookup should only be allowed at runtime

if we can guarantee that there is no way an exception can be

raised. This means some specializations, e.g. specializing

for property() isn't safe.

Py_XDECREF(getattribute);

}

else {

*descr = NULL;

*tp_version = FT_ATOMIC_LOAD_UINT_RELAXED(type->tp_version_tag);

return GETSET_OVERRIDDEN;

}

unsigned int descr_version;

PyObject *descriptor = _PyType_LookupRefAndVersion(type, name, &descr_version);

*descr = descriptor;

*tp_version = have_ga_version ? ga_version : descr_version;

if (descriptor_is_class(descriptor, name)) {

return DUNDER_CLASS;

}

return classify_descriptor(descriptor, has_getattr);

}

static DescriptorClassification

analyze_descriptor_store(PyTypeObject *type, PyObject *name, PyObject **descr, unsigned int *tp_version)

{

if (type->tp_setattro != PyObject_GenericSetAttr) {

*descr = NULL;

return GETSET_OVERRIDDEN;

}

PyObject *descriptor = _PyType_LookupRefAndVersion(type, name, tp_version);

*descr = descriptor;

if (descriptor_is_class(descriptor, name)) {

return DUNDER_CLASS;

}

return classify_descriptor(descriptor, false);

}

static int

specialize_dict_access_inline(

PyObject *owner, _Py_CODEUNIT *instr, PyTypeObject *type,

PyObject *name, unsigned int tp_version,

int base_op, int values_op)

{

_PyAttrCache *cache = (_PyAttrCache *)(instr + 1);

PyDictKeysObject *keys = ((PyHeapTypeObject *)type)->ht_cached_keys;

assert(PyUnicode_CheckExact(name));

_Py_CRITICAL_SECTION_ASSERT_OBJECT_LOCKED(owner);

Py_ssize_t index = _PyDictKeys_StringLookupSplit(keys, name);

assert (index != DKIX_ERROR);

if (index == DKIX_EMPTY) {

SPECIALIZATION_FAIL(base_op, SPEC_FAIL_ATTR_NOT_IN_KEYS);

return 0;

}

assert(index >= 0);

assert(_PyObject_InlineValues(owner)->valid);

char *value_addr = (char *)&_PyObject_InlineValues(owner)->values[index];

Py_ssize_t offset = value_addr - (char *)owner;

if (offset != (uint16_t)offset) {

SPECIALIZATION_FAIL(base_op, SPEC_FAIL_OUT_OF_RANGE);

return 0;

}

cache->index = (uint16_t)offset;

write_u32(cache->version, tp_version);

specialize(instr, values_op);

return 1;

}

static int

specialize_dict_access_hint(

PyDictObject *dict, _Py_CODEUNIT *instr, PyTypeObject *type,

PyObject *name, unsigned int tp_version,

int base_op, int hint_op)

{

_PyAttrCache *cache = (_PyAttrCache *)(instr + 1);

_Py_CRITICAL_SECTION_ASSERT_OBJECT_LOCKED(dict);

#ifdef Py_GIL_DISABLED

_PyDict_EnsureSharedOnRead(dict);

#endif

// We found an instance with a __dict__.

if (_PyDict_HasSplitTable(dict)) {

SPECIALIZATION_FAIL(base_op, SPEC_FAIL_ATTR_SPLIT_DICT);

return 0;

}

Py_ssize_t index = _PyDict_LookupIndex(dict, name);

if (index != (uint16_t)index) {

SPECIALIZATION_FAIL(base_op,

index == DKIX_EMPTY ?

SPEC_FAIL_ATTR_NOT_IN_DICT :

SPEC_FAIL_OUT_OF_RANGE);

return 0;

}

cache->index = (uint16_t)index;

write_u32(cache->version, tp_version);

specialize(instr, hint_op);

return 1;

}

static int

specialize_dict_access(

PyObject *owner, _Py_CODEUNIT *instr, PyTypeObject *type,

DescriptorClassification kind, PyObject *name, unsigned int tp_version,

int base_op, int values_op, int hint_op)

{

assert(kind == NON_OVERRIDING || kind == NON_DESCRIPTOR || kind == ABSENT ||

kind == BUILTIN_CLASSMETHOD || kind == PYTHON_CLASSMETHOD ||

kind == METHOD);

// No descriptor, or non overriding.

if ((type->tp_flags & Py_TPFLAGS_MANAGED_DICT) == 0) {

SPECIALIZATION_FAIL(base_op, SPEC_FAIL_ATTR_NOT_MANAGED_DICT);

return 0;

}

if (type->tp_flags & Py_TPFLAGS_INLINE_VALUES &&

FT_ATOMIC_LOAD_UINT8(_PyObject_InlineValues(owner)->valid) &&

!(base_op == STORE_ATTR && _PyObject_GetManagedDict(owner) != NULL))

{

int res;

Py_BEGIN_CRITICAL_SECTION(owner);

PyDictObject *dict = _PyObject_GetManagedDict(owner);

if (dict == NULL) {

// managed dict, not materialized, inline values valid

res = specialize_dict_access_inline(owner, instr, type, name,

tp_version, base_op, values_op);

}

else {

// lost race and dict was created, fail specialization

SPECIALIZATION_FAIL(STORE_ATTR, SPEC_FAIL_OTHER);

res = 0;

}

Py_END_CRITICAL_SECTION();

return res;

}

else {

PyDictObject *dict = _PyObject_GetManagedDict(owner);

if (dict == NULL || !PyDict_CheckExact(dict)) {

SPECIALIZATION_FAIL(base_op, SPEC_FAIL_NO_DICT);

return 0;

}

int res;

Py_BEGIN_CRITICAL_SECTION(dict);

// materialized managed dict

res = specialize_dict_access_hint(dict, instr, type, name,

tp_version, base_op, hint_op);

Py_END_CRITICAL_SECTION();

return res;

}

static int

specialize_attr_loadclassattr(PyObject *owner, _Py_CODEUNIT *instr,

PyObject *name, PyObject *descr,

unsigned int tp_version,

DescriptorClassification kind, bool is_method,

uint32_t shared_keys_version);

static int specialize_class_load_attr(PyObject* owner, _Py_CODEUNIT* instr, PyObject* name);

/* Returns true if instances of obj's class are

* likely to have `name` in their __dict__.

* For objects with inline values, we check in the shared keys.

* For other objects, we check their actual dictionary.

static bool

instance_has_key(PyObject *obj, PyObject *name, uint32_t *shared_keys_version)

{

PyTypeObject *cls = Py_TYPE(obj);

if ((cls->tp_flags & Py_TPFLAGS_MANAGED_DICT) == 0) {

return false;

}

if (cls->tp_flags & Py_TPFLAGS_INLINE_VALUES) {

PyDictKeysObject *keys = ((PyHeapTypeObject *)cls)->ht_cached_keys;

Py_ssize_t index =

_PyDictKeys_StringLookupAndVersion(keys, name, shared_keys_version);

return index >= 0;

}

PyDictObject *dict = _PyObject_GetManagedDict(obj);

if (dict == NULL || !PyDict_CheckExact(dict)) {

return false;

}

bool result;

Py_BEGIN_CRITICAL_SECTION(dict);

if (dict->ma_values) {

result = false;

}

else {

result = (_PyDict_LookupIndex(dict, name) >= 0);

}

Py_END_CRITICAL_SECTION();

return result;

}

static int

do_specialize_instance_load_attr(PyObject* owner, _Py_CODEUNIT* instr, PyObject* name,

bool shadow, uint32_t shared_keys_version,

DescriptorClassification kind, PyObject *descr, unsigned int tp_version)

{

_PyAttrCache *cache = (_PyAttrCache *)(instr + 1);

PyTypeObject *type = Py_TYPE(owner);

if (tp_version == 0) {

SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_OUT_OF_VERSIONS);

return -1;

}

uint8_t oparg = FT_ATOMIC_LOAD_UINT8_RELAXED(instr->op.arg);

switch(kind) {

case OVERRIDING:

SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_ATTR_OVERRIDING_DESCRIPTOR);

return -1;

case METHOD:

{

if (shadow) {

goto try_instance;

}

if (oparg & 1) {

if (specialize_attr_loadclassattr(owner, instr, name, descr,

tp_version, kind, true,

shared_keys_version)) {

return 0;

}

else {

return -1;

}

SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_ATTR_METHOD);

return -1;

}

case PROPERTY:

{

_PyLoadMethodCache *lm_cache = (_PyLoadMethodCache *)(instr + 1);

assert(Py_TYPE(descr) == &PyProperty_Type);

PyObject *fget = ((_PyPropertyObject *)descr)->prop_get;

if (fget == NULL) {

SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_EXPECTED_ERROR);

return -1;

}

if (!Py_IS_TYPE(fget, &PyFunction_Type)) {

SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_ATTR_PROPERTY_NOT_PY_FUNCTION);

return -1;

}

if (!function_check_args(fget, 1, LOAD_ATTR)) {

return -1;

}

if (oparg & 1) {

SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_ATTR_METHOD);

return -1;

}

/* Don't specialize if PEP 523 is active */

if (!_PyInterpreterState_IsSpecializationEnabled(_PyInterpreterState_GET())) {

SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_OTHER);

return -1;

}

#ifdef Py_GIL_DISABLED

if (!_PyObject_HasDeferredRefcount(fget)) {

SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_ATTR_DESCR_NOT_DEFERRED);

return -1;

}

#endif

uint32_t func_version = function_get_version(fget, LOAD_ATTR);

if (func_version == 0) {

return -1;

}

assert(tp_version != 0);

write_u32(lm_cache->type_version, tp_version);

write_u32(lm_cache->keys_version, func_version);

/* borrowed */

write_ptr(lm_cache->descr, fget);

specialize(instr, LOAD_ATTR_PROPERTY);

return 0;

}

case OBJECT_SLOT:

{

PyMemberDescrObject *member = (PyMemberDescrObject *)descr;

struct PyMemberDef *dmem = member->d_member;

Py_ssize_t offset = dmem->offset;

if (!PyObject_TypeCheck(owner, member->d_common.d_type)) {

SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_EXPECTED_ERROR);

return -1;

}

if (dmem->flags & _Py_AFTER_ITEMS) {

SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_ATTR_SLOT_AFTER_ITEMS);

return -1;

}

if (dmem->flags & Py_AUDIT_READ) {

SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_ATTR_AUDITED_SLOT);

return -1;

}

if (offset != (uint16_t)offset) {

SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_OUT_OF_RANGE);

return -1;

}

assert(dmem->type == Py_T_OBJECT_EX || dmem->type == _Py_T_OBJECT);

assert(offset > 0);

cache->index = (uint16_t)offset;

write_u32(cache->version, tp_version);

specialize(instr, LOAD_ATTR_SLOT);

return 0;

}

case DUNDER_CLASS:

{

Py_ssize_t offset = offsetof(PyObject, ob_type);

assert(offset == (uint16_t)offset);

cache->index = (uint16_t)offset;

write_u32(cache->version, tp_version);

specialize(instr, LOAD_ATTR_SLOT);

return 0;

}

case OTHER_SLOT:

SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_ATTR_NON_OBJECT_SLOT);

return -1;

case MUTABLE:

SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_ATTR_MUTABLE_CLASS);

return -1;

case GETSET_OVERRIDDEN:

SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_OVERRIDDEN);

return -1;

case GETATTRIBUTE_IS_PYTHON_FUNCTION:

{

assert(Py_IS_TYPE(descr, &PyFunction_Type));

_PyLoadMethodCache *lm_cache = (_PyLoadMethodCache *)(instr + 1);

if (!function_check_args(descr, 2, LOAD_ATTR)) {

return -1;

}

if (oparg & 1) {

SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_ATTR_METHOD);

return -1;

}

uint32_t version = function_get_version(descr, LOAD_ATTR);

if (version == 0) {

return -1;

}

/* Don't specialize if PEP 523 is active */

if (!_PyInterpreterState_IsSpecializationEnabled(_PyInterpreterState_GET())) {

SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_OTHER);

return -1;

}

#ifdef Py_GIL_DISABLED

if (!_PyObject_HasDeferredRefcount(descr)) {

SPECIALIZATION_FAIL(LOAD_ATTR, SPEC_FAIL_ATTR_DESCR_NOT_DEFERRED);

return -1;

}

#endif

write_u32(lm_cache->keys_version, version);

/* borrowed */

write_ptr(lm_cache->descr, descr);

write_u32(lm_cache->type_version, tp_version);

specialize(instr, LOAD_ATTR_GETATTRIBUTE_OVERRIDDEN);

return 0;

}

case BUILTIN_CLASSMETHOD:

case PYTHON_CLASSMETHOD:

case NON_OVERRIDING:

if (shadow) {

goto try_instance;

}

return -1;

case NON_DESCRIPTOR:

if (shadow) {

goto try_instance;

}

if ((oparg & 1) == 0) {

if (specialize_attr_loadclassattr(owner, instr, name, descr,

tp_version, kind, false,

shared_keys_version)) {

return 0;

}

return -1;

case ABSENT:

if (shadow) {

goto try_instance;

}

set_counter((_Py_BackoffCounter*)instr + 1, adaptive_counter_cooldown());

return 0;

}

Py_UNREACHABLE();

try_instance:

if (specialize_dict_access(owner, instr, type, kind, name, tp_version,

LOAD_ATTR, LOAD_ATTR_INSTANCE_VALUE, LOAD_ATTR_WITH_HINT))

{

return 0;

}

return -1;

}

static int

specialize_instance_load_attr(PyObject* owner, _Py_CODEUNIT* instr, PyObject* name)

{

// 0 is not a valid version

PyObject *descr = NULL;

unsigned int tp_version = 0;

PyTypeObject *type = Py_TYPE(owner);

// Read the type version before the keys version, we could have a concurrent

// modification of the split keys in which case we update the keys version and

// then the type version, this ensures we will still deopt if that happens.

DescriptorClassification kind = analyze_descriptor_load(type, name, &descr, &tp_version);

uint32_t shared_keys_version = 0;

bool shadow = instance_has_key(owner, name, &shared_keys_version);

int result = do_specialize_instance_load_attr(owner, instr, name, shadow, shared_keys_version, kind, descr, tp_version);

Py_XDECREF(descr);

return result;

}

Py_NO_INLINE void

_Py_Specialize_LoadAttr(_PyStackRef owner_st, _Py_CODEUNIT *instr, PyObject *name)

{

PyObject *owner = PyStackRef_AsPyObjectBorrow(owner_st);

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