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cpython/Python/optimizer.c

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#include "Python.h"
#include "opcode.h"
#include "pycore_interp.h"
#include "pycore_opcode.h"
#include "opcode_metadata.h"
#include "pycore_pystate.h" // _PyInterpreterState_GET()
#include "pycore_uops.h"
#include "cpython/optimizer.h"
#include <stdbool.h>
#include <stdint.h>
#include <stddef.h>
static bool
has_space_for_executor(PyCodeObject *code, _Py_CODEUNIT *instr)
{
if (instr->op.code == ENTER_EXECUTOR) {
return true;
}
if (code->co_executors == NULL) {
return true;
}
return code->co_executors->size < 256;
}
static int32_t
get_index_for_executor(PyCodeObject *code, _Py_CODEUNIT *instr)
{
if (instr->op.code == ENTER_EXECUTOR) {
return instr->op.arg;
}
_PyExecutorArray *old = code->co_executors;
int size = 0;
int capacity = 0;
if (old != NULL) {
size = old->size;
capacity = old->capacity;
assert(size < 256);
}
assert(size <= capacity);
if (size == capacity) {
/* Array is full. Grow array */
int new_capacity = capacity ? capacity * 2 : 4;
_PyExecutorArray *new = PyMem_Realloc(
old,
offsetof(_PyExecutorArray, executors) +
new_capacity * sizeof(_PyExecutorObject *));
if (new == NULL) {
return -1;
}
new->capacity = new_capacity;
new->size = size;
code->co_executors = new;
}
assert(size < code->co_executors->capacity);
return size;
}
static void
insert_executor(PyCodeObject *code, _Py_CODEUNIT *instr, int index, _PyExecutorObject *executor)
{
Py_INCREF(executor);
if (instr->op.code == ENTER_EXECUTOR) {
assert(index == instr->op.arg);
_PyExecutorObject *old = code->co_executors->executors[index];
executor->vm_data.opcode = old->vm_data.opcode;
executor->vm_data.oparg = old->vm_data.oparg;
old->vm_data.opcode = 0;
code->co_executors->executors[index] = executor;
Py_DECREF(old);
}
else {
assert(code->co_executors->size == index);
assert(code->co_executors->capacity > index);
executor->vm_data.opcode = instr->op.code;
executor->vm_data.oparg = instr->op.arg;
code->co_executors->executors[index] = executor;
assert(index < 256);
instr->op.code = ENTER_EXECUTOR;
instr->op.arg = index;
code->co_executors->size++;
}
return;
}
int
PyUnstable_Replace_Executor(PyCodeObject *code, _Py_CODEUNIT *instr, _PyExecutorObject *new)
{
if (instr->op.code != ENTER_EXECUTOR) {
PyErr_Format(PyExc_ValueError, "No executor to replace");
return -1;
}
int index = instr->op.arg;
assert(index >= 0);
insert_executor(code, instr, index, new);
return 0;
}
static int
error_optimize(
_PyOptimizerObject* self,
PyCodeObject *code,
_Py_CODEUNIT *instr,
_PyExecutorObject **exec)
{
PyErr_Format(PyExc_SystemError, "Should never call error_optimize");
return -1;
}
static PyTypeObject DefaultOptimizer_Type = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
.tp_name = "noop_optimizer",
.tp_basicsize = sizeof(_PyOptimizerObject),
.tp_itemsize = 0,
.tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_DISALLOW_INSTANTIATION,
};
_PyOptimizerObject _PyOptimizer_Default = {
PyObject_HEAD_INIT(&DefaultOptimizer_Type)
.optimize = error_optimize,
.resume_threshold = UINT16_MAX,
.backedge_threshold = UINT16_MAX,
};
_PyOptimizerObject *
PyUnstable_GetOptimizer(void)
{
PyInterpreterState *interp = _PyInterpreterState_GET();
if (interp->optimizer == &_PyOptimizer_Default) {
return NULL;
}
assert(interp->optimizer_backedge_threshold == interp->optimizer->backedge_threshold);
assert(interp->optimizer_resume_threshold == interp->optimizer->resume_threshold);
Py_INCREF(interp->optimizer);
return interp->optimizer;
}
void
PyUnstable_SetOptimizer(_PyOptimizerObject *optimizer)
{
PyInterpreterState *interp = _PyInterpreterState_GET();
if (optimizer == NULL) {
optimizer = &_PyOptimizer_Default;
}
_PyOptimizerObject *old = interp->optimizer;
Py_INCREF(optimizer);
interp->optimizer = optimizer;
interp->optimizer_backedge_threshold = optimizer->backedge_threshold;
interp->optimizer_resume_threshold = optimizer->resume_threshold;
Py_DECREF(old);
}
_PyInterpreterFrame *
_PyOptimizer_BackEdge(_PyInterpreterFrame *frame, _Py_CODEUNIT *src, _Py_CODEUNIT *dest, PyObject **stack_pointer)
{
PyCodeObject *code = (PyCodeObject *)frame->f_executable;
assert(PyCode_Check(code));
PyInterpreterState *interp = _PyInterpreterState_GET();
if (!has_space_for_executor(code, src)) {
goto jump_to_destination;
}
_PyOptimizerObject *opt = interp->optimizer;
_PyExecutorObject *executor = NULL;
int err = opt->optimize(opt, code, dest, &executor);
if (err <= 0) {
assert(executor == NULL);
if (err < 0) {
return NULL;
}
goto jump_to_destination;
}
int index = get_index_for_executor(code, src);
if (index < 0) {
/* Out of memory. Don't raise and assume that the
* error will show up elsewhere.
*
* If an optimizer has already produced an executor,
* it might get confused by the executor disappearing,
* but there is not much we can do about that here. */
Py_DECREF(executor);
goto jump_to_destination;
}
insert_executor(code, src, index, executor);
assert(frame->prev_instr == src);
frame->prev_instr = dest - 1;
return executor->execute(executor, frame, stack_pointer);
jump_to_destination:
frame->prev_instr = dest - 1;
_PyFrame_SetStackPointer(frame, stack_pointer);
return frame;
}
_PyExecutorObject *
PyUnstable_GetExecutor(PyCodeObject *code, int offset)
{
int code_len = (int)Py_SIZE(code);
for (int i = 0 ; i < code_len;) {
if (_PyCode_CODE(code)[i].op.code == ENTER_EXECUTOR && i*2 == offset) {
int oparg = _PyCode_CODE(code)[i].op.arg;
_PyExecutorObject *res = code->co_executors->executors[oparg];
Py_INCREF(res);
return res;
}
i += _PyInstruction_GetLength(code, i);
}
PyErr_SetString(PyExc_ValueError, "no executor at given byte offset");
return NULL;
}
/** Test support **/
typedef struct {
_PyOptimizerObject base;
int64_t count;
} _PyCounterOptimizerObject;
typedef struct {
_PyExecutorObject executor;
_PyCounterOptimizerObject *optimizer;
_Py_CODEUNIT *next_instr;
} _PyCounterExecutorObject;
static void
counter_dealloc(_PyCounterExecutorObject *self) {
Py_DECREF(self->optimizer);
PyObject_Free(self);
}
static PyTypeObject CounterExecutor_Type = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
.tp_name = "counting_executor",
.tp_basicsize = sizeof(_PyCounterExecutorObject),
.tp_itemsize = 0,
.tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_DISALLOW_INSTANTIATION,
.tp_dealloc = (destructor)counter_dealloc,
};
static _PyInterpreterFrame *
counter_execute(_PyExecutorObject *self, _PyInterpreterFrame *frame, PyObject **stack_pointer)
{
((_PyCounterExecutorObject *)self)->optimizer->count++;
_PyFrame_SetStackPointer(frame, stack_pointer);
frame->prev_instr = ((_PyCounterExecutorObject *)self)->next_instr - 1;
Py_DECREF(self);
return frame;
}
static int
counter_optimize(
_PyOptimizerObject* self,
PyCodeObject *code,
_Py_CODEUNIT *instr,
_PyExecutorObject **exec_ptr)
{
_PyCounterExecutorObject *executor = (_PyCounterExecutorObject *)_PyObject_New(&CounterExecutor_Type);
if (executor == NULL) {
return -1;
}
executor->executor.execute = counter_execute;
Py_INCREF(self);
executor->optimizer = (_PyCounterOptimizerObject *)self;
executor->next_instr = instr;
*exec_ptr = (_PyExecutorObject *)executor;
return 1;
}
static PyObject *
counter_get_counter(PyObject *self, PyObject *args)
{
return PyLong_FromLongLong(((_PyCounterOptimizerObject *)self)->count);
}
static PyMethodDef counter_methods[] = {
{ "get_count", counter_get_counter, METH_NOARGS, NULL },
{ NULL, NULL },
};
static PyTypeObject CounterOptimizer_Type = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
.tp_name = "Counter optimizer",
.tp_basicsize = sizeof(_PyCounterOptimizerObject),
.tp_itemsize = 0,
.tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_DISALLOW_INSTANTIATION,
.tp_methods = counter_methods,
};
PyObject *
PyUnstable_Optimizer_NewCounter(void)
{
_PyCounterOptimizerObject *opt = (_PyCounterOptimizerObject *)_PyObject_New(&CounterOptimizer_Type);
if (opt == NULL) {
return NULL;
}
opt->base.optimize = counter_optimize;
opt->base.resume_threshold = UINT16_MAX;
opt->base.backedge_threshold = 0;
opt->count = 0;
return (PyObject *)opt;
}
///////////////////// Experimental UOp Optimizer /////////////////////
static void
uop_dealloc(_PyUOpExecutorObject *self) {
PyObject_Free(self);
}
static const char *
uop_name(int index) {
if (index < EXIT_TRACE) {
return _PyOpcode_OpName[index];
}
return _PyOpcode_uop_name[index];
}
static Py_ssize_t
uop_len(_PyUOpExecutorObject *self)
{
int count = 1;
for (; count < _Py_UOP_MAX_TRACE_LENGTH; count++) {
if (self->trace[count-1].opcode == EXIT_TRACE) {
break;
}
}
return count;
}
static PyObject *
uop_item(_PyUOpExecutorObject *self, Py_ssize_t index)
{
for (int i = 0; i < _Py_UOP_MAX_TRACE_LENGTH; i++) {
if (self->trace[i].opcode == EXIT_TRACE) {
break;
}
if (i != index) {
continue;
}
const char *name = uop_name(self->trace[i].opcode);
PyObject *oname = _PyUnicode_FromASCII(name, strlen(name));
if (oname == NULL) {
return NULL;
}
PyObject *operand = PyLong_FromUnsignedLongLong(self->trace[i].operand);
if (operand == NULL) {
Py_DECREF(oname);
return NULL;
}
PyObject *args[2] = { oname, operand };
return _PyTuple_FromArraySteal(args, 2);
}
PyErr_SetNone(PyExc_IndexError);
return NULL;
}
PySequenceMethods uop_as_sequence = {
.sq_length = (lenfunc)uop_len,
.sq_item = (ssizeargfunc)uop_item,
};
static PyTypeObject UOpExecutor_Type = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
.tp_name = "uop_executor",
.tp_basicsize = sizeof(_PyUOpExecutorObject),
.tp_itemsize = 0,
.tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_DISALLOW_INSTANTIATION,
.tp_dealloc = (destructor)uop_dealloc,
.tp_as_sequence = &uop_as_sequence,
};
static int
translate_bytecode_to_trace(
PyCodeObject *code,
_Py_CODEUNIT *instr,
_PyUOpInstruction *trace,
int max_length)
{
#ifdef Py_DEBUG
_Py_CODEUNIT *initial_instr = instr;
#endif
int trace_length = 0;
#ifdef Py_DEBUG
char *uop_debug = Py_GETENV("PYTHONUOPSDEBUG");
int lltrace = 0;
if (uop_debug != NULL && *uop_debug >= '0') {
lltrace = *uop_debug - '0'; // TODO: Parse an int and all that
}
#define DPRINTF(level, ...) \
if (lltrace >= (level)) { fprintf(stderr, __VA_ARGS__); }
#else
#define DPRINTF(level, ...)
#endif
#define ADD_TO_TRACE(OPCODE, OPERAND) \
DPRINTF(2, \
" ADD_TO_TRACE(%s, %" PRIu64 ")\n", \
(OPCODE) < 256 ? _PyOpcode_OpName[(OPCODE)] : _PyOpcode_uop_name[(OPCODE)], \
(uint64_t)(OPERAND)); \
assert(trace_length < max_length); \
trace[trace_length].opcode = (OPCODE); \
trace[trace_length].operand = (OPERAND); \
trace_length++;
DPRINTF(4,
"Optimizing %s (%s:%d) at byte offset %ld\n",
PyUnicode_AsUTF8(code->co_qualname),
PyUnicode_AsUTF8(code->co_filename),
code->co_firstlineno,
2 * (long)(initial_instr - (_Py_CODEUNIT *)code->co_code_adaptive));
for (;;) {
ADD_TO_TRACE(SAVE_IP, (int)(instr - (_Py_CODEUNIT *)code->co_code_adaptive));
int opcode = instr->op.code;
int oparg = instr->op.arg;
int extras = 0;
while (opcode == EXTENDED_ARG) {
instr++;
extras += 1;
opcode = instr->op.code;
oparg = (oparg << 8) | instr->op.arg;
}
if (opcode == ENTER_EXECUTOR) {
_PyExecutorObject *executor = (_PyExecutorObject *)code->co_executors->executors[oparg&255];
opcode = executor->vm_data.opcode;
DPRINTF(2, " * ENTER_EXECUTOR -> %s\n", _PyOpcode_OpName[opcode]);
oparg = (oparg & 0xffffff00) | executor->vm_data.oparg;
}
switch (opcode) {
default:
{
const struct opcode_macro_expansion *expansion = &_PyOpcode_macro_expansion[opcode];
if (expansion->nuops > 0) {
// Reserve space for nuops (+ SAVE_IP + EXIT_TRACE)
int nuops = expansion->nuops;
if (trace_length + nuops + 2 > max_length) {
DPRINTF(1,
"Ran out of space for %s\n",
opcode < 256 ? _PyOpcode_OpName[opcode] : _PyOpcode_uop_name[opcode]);
goto done;
}
for (int i = 0; i < nuops; i++) {
uint64_t operand;
int offset = expansion->uops[i].offset;
switch (expansion->uops[i].size) {
case OPARG_FULL:
operand = oparg;
if (extras && OPCODE_HAS_JUMP(opcode)) {
if (opcode == JUMP_BACKWARD_NO_INTERRUPT) {
operand -= extras;
}
else {
assert(opcode != JUMP_BACKWARD);
operand += extras;
}
}
break;
case OPARG_CACHE_1:
operand = read_u16(&instr[offset].cache);
break;
case OPARG_CACHE_2:
operand = read_u32(&instr[offset].cache);
break;
case OPARG_CACHE_4:
operand = read_u64(&instr[offset].cache);
break;
case OPARG_TOP: // First half of super-instr
operand = oparg >> 4;
break;
case OPARG_BOTTOM: // Second half of super-instr
operand = oparg & 0xF;
break;
default:
fprintf(stderr,
"opcode=%d, oparg=%d; nuops=%d, i=%d; size=%d, offset=%d\n",
opcode, oparg, nuops, i,
expansion->uops[i].size,
expansion->uops[i].offset);
Py_FatalError("garbled expansion");
}
ADD_TO_TRACE(expansion->uops[i].uop, operand);
}
break;
}
DPRINTF(2,
"Unsupported opcode %s\n",
opcode < 256 ? _PyOpcode_OpName[opcode] : _PyOpcode_uop_name[opcode]);
goto done; // Break out of loop
}
}
instr++;
// Add cache size for opcode
instr += _PyOpcode_Caches[_PyOpcode_Deopt[opcode]];
}
done:
// Skip short traces like SAVE_IP, LOAD_FAST, SAVE_IP, EXIT_TRACE
if (trace_length > 3) {
ADD_TO_TRACE(EXIT_TRACE, 0);
DPRINTF(1,
"Created a trace for %s (%s:%d) at byte offset %ld -- length %d\n",
PyUnicode_AsUTF8(code->co_qualname),
PyUnicode_AsUTF8(code->co_filename),
code->co_firstlineno,
2 * (long)(initial_instr - (_Py_CODEUNIT *)code->co_code_adaptive),
trace_length);
return trace_length;
}
else {
DPRINTF(4,
"No trace for %s (%s:%d) at byte offset %ld\n",
PyUnicode_AsUTF8(code->co_qualname),
PyUnicode_AsUTF8(code->co_filename),
code->co_firstlineno,
2 * (long)(initial_instr - (_Py_CODEUNIT *)code->co_code_adaptive));
}
return 0;
#undef ADD_TO_TRACE
#undef DPRINTF
}
static int
uop_optimize(
_PyOptimizerObject *self,
PyCodeObject *code,
_Py_CODEUNIT *instr,
_PyExecutorObject **exec_ptr)
{
_PyUOpInstruction trace[_Py_UOP_MAX_TRACE_LENGTH];
int trace_length = translate_bytecode_to_trace(code, instr, trace, _Py_UOP_MAX_TRACE_LENGTH);
if (trace_length <= 0) {
// Error or nothing translated
return trace_length;
}
OBJECT_STAT_INC(optimization_traces_created);
_PyUOpExecutorObject *executor = PyObject_New(_PyUOpExecutorObject, &UOpExecutor_Type);
if (executor == NULL) {
return -1;
}
executor->base.execute = _PyUopExecute;
memcpy(executor->trace, trace, trace_length * sizeof(_PyUOpInstruction));
*exec_ptr = (_PyExecutorObject *)executor;
return 1;
}
static void
uop_opt_dealloc(PyObject *self) {
PyObject_Free(self);
}
static PyTypeObject UOpOptimizer_Type = {
PyVarObject_HEAD_INIT(&PyType_Type, 0)
.tp_name = "uop_optimizer",
.tp_basicsize = sizeof(_PyOptimizerObject),
.tp_itemsize = 0,
.tp_flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_DISALLOW_INSTANTIATION,
.tp_dealloc = uop_opt_dealloc,
};
PyObject *
PyUnstable_Optimizer_NewUOpOptimizer(void)
{
_PyOptimizerObject *opt = PyObject_New(_PyOptimizerObject, &UOpOptimizer_Type);
if (opt == NULL) {
return NULL;
}
opt->optimize = uop_optimize;
opt->resume_threshold = UINT16_MAX;
// Need at least 3 iterations to settle specializations.
// A few lower bits of the counter are reserved for other flags.
opt->backedge_threshold = 3 << OPTIMIZER_BITS_IN_COUNTER;
return (PyObject *)opt;
}
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