GH-116202: Incorporate invalidation check into _START_EXECUTOR. (GH-118044)

Author: markshannon

Include/internal/pycore_uop_metadata.h

@@ -4181,6 +4181,7 @@ dummy_func(
 #ifndef _Py_JIT
             current_executor = (_PyExecutorObject*)executor;
 #endif
+            DEOPT_IF(!((_PyExecutorObject *)executor)->vm_data.valid);
         }
 
         tier2 op(_FATAL_ERROR, (--)) {

Python/bytecodes.c

@@ -1109,8 +1109,6 @@ make_executor_from_uops(_PyUOpInstruction *buffer, int length, const _PyBloomFil
     assert(next_exit == -1);
     assert(dest == executor->trace);
     assert(dest->opcode == _START_EXECUTOR);
-    dest->oparg = 0;
-    dest->target = 0;
     _Py_ExecutorInit(executor, dependencies);
 #ifdef Py_DEBUG
     char *python_lltrace = Py_GETENV("PYTHON_LLTRACE");
@@ -1314,7 +1312,7 @@ counter_optimize(
     }
     _Py_CODEUNIT *target = instr + 1 + _PyOpcode_Caches[JUMP_BACKWARD] - oparg;
     _PyUOpInstruction buffer[5] = {
-        { .opcode = _START_EXECUTOR },
+        { .opcode = _START_EXECUTOR, .jump_target = 4, .format=UOP_FORMAT_JUMP },
         { .opcode = _LOAD_CONST_INLINE_BORROW, .operand = (uintptr_t)self },
         { .opcode = _INTERNAL_INCREMENT_OPT_COUNTER },
         { .opcode = _EXIT_TRACE, .jump_target = 4, .format=UOP_FORMAT_JUMP },

Python/executor_cases.c.h

@@ -497,6 +497,9 @@ remove_unneeded_uops(_PyUOpInstruction *buffer, int buffer_size)
     for (int pc = 0; pc < buffer_size; pc++) {
         int opcode = buffer[pc].opcode;
         switch (opcode) {
+            case _START_EXECUTOR:
+                may_have_escaped = false;
+                break;
             case _SET_IP:
                 buffer[pc].opcode = _NOP;
                 last_set_ip = pc;