mirror of https://github.com/python/cpython.git
99 lines
2.8 KiB
C
99 lines
2.8 KiB
C
#include "Python.h"
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#include "opcode.h"
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#include "pycore_interp.h"
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#include "pycore_opcode_metadata.h"
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#include "pycore_opcode_utils.h"
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#include "pycore_pystate.h" // _PyInterpreterState_GET()
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#include "pycore_uop_metadata.h"
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#include "pycore_long.h"
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#include "cpython/optimizer.h"
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#include <stdbool.h>
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#include <stdint.h>
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#include <stddef.h>
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#include "pycore_optimizer.h"
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static void
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peephole_opt(PyCodeObject *co, _PyUOpInstruction *buffer, int buffer_size)
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{
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for (int pc = 0; pc < buffer_size; pc++) {
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int opcode = buffer[pc].opcode;
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switch(opcode) {
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case _LOAD_CONST: {
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assert(co != NULL);
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PyObject *val = PyTuple_GET_ITEM(co->co_consts, buffer[pc].oparg);
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buffer[pc].opcode = _Py_IsImmortal(val) ? _LOAD_CONST_INLINE_BORROW : _LOAD_CONST_INLINE;
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buffer[pc].operand = (uintptr_t)val;
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break;
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}
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case _CHECK_PEP_523:
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{
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/* Setting the eval frame function invalidates
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* all executors, so no need to check dynamically */
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if (_PyInterpreterState_GET()->eval_frame == NULL) {
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buffer[pc].opcode = _NOP;
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}
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break;
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}
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case _PUSH_FRAME:
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case _POP_FRAME:
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co = (PyCodeObject *)buffer[pc].operand;
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break;
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case _JUMP_TO_TOP:
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case _EXIT_TRACE:
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return;
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}
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}
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}
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static void
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remove_unneeded_uops(_PyUOpInstruction *buffer, int buffer_size)
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{
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int last_set_ip = -1;
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bool maybe_invalid = false;
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for (int pc = 0; pc < buffer_size; pc++) {
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int opcode = buffer[pc].opcode;
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if (opcode == _SET_IP) {
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buffer[pc].opcode = NOP;
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last_set_ip = pc;
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}
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else if (opcode == _CHECK_VALIDITY) {
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if (maybe_invalid) {
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maybe_invalid = false;
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}
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else {
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buffer[pc].opcode = NOP;
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}
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}
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else if (opcode == _JUMP_TO_TOP || opcode == _EXIT_TRACE) {
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break;
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}
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else {
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if (_PyUop_Flags[opcode] & HAS_ESCAPES_FLAG) {
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maybe_invalid = true;
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if (last_set_ip >= 0) {
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buffer[last_set_ip].opcode = _SET_IP;
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}
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}
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if ((_PyUop_Flags[opcode] & HAS_ERROR_FLAG) || opcode == _PUSH_FRAME) {
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if (last_set_ip >= 0) {
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buffer[last_set_ip].opcode = _SET_IP;
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}
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}
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}
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}
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}
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int
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_Py_uop_analyze_and_optimize(
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PyCodeObject *co,
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_PyUOpInstruction *buffer,
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int buffer_size,
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int curr_stacklen
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)
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{
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peephole_opt(co, buffer, buffer_size);
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remove_unneeded_uops(buffer, buffer_size);
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return 0;
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}
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