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GH-121784: Generate an error during code gen if a variable is marked unused, but is used and thus cached in a prior uop. (#121788)

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* Reject uop definitions that declare values as 'unused' that are already cached by prior uops

* Track which variables are defined and only load from memory when needed

* Support explicit `flush` in macro definitions. 

* Make sure stack is flushed in where needed.
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Mark Shannon 2024-07-18 12:49:24 +01:00 • committed by GitHub
parent 169324c27a
commit 3eacfc1a4d
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9 changed files with 443 additions and 255 deletions
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9
Python/executor_cases.c.h generated
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@ -3527,7 +3527,6 @@
assert(PyStackRef_IsNull(null));
assert(Py_TYPE(callable_o) == &PyMethod_Type);
self = PyStackRef_FromPyObjectNew(((PyMethodObject *)callable_o)->im_self);
stack_pointer[-1 - oparg] = self; // Patch stack as it is used by _PY_FRAME_GENERAL
method = PyStackRef_FromPyObjectNew(((PyMethodObject *)callable_o)->im_func);
assert(PyFunction_Check(PyStackRef_AsPyObjectBorrow(method)));
PyStackRef_CLOSE(callable);
@ -3624,13 +3623,9 @@
callable = stack_pointer[-2 - oparg];
PyObject *callable_o = PyStackRef_AsPyObjectBorrow(callable);
STAT_INC(CALL, hit);
stack_pointer[-1 - oparg] = PyStackRef_FromPyObjectNew(((PyMethodObject *)callable_o)->im_self); // Patch stack as it is used by _INIT_CALL_PY_EXACT_ARGS
stack_pointer[-2 - oparg] = PyStackRef_FromPyObjectNew(((PyMethodObject *)callable_o)->im_func); // This is used by CALL, upon deoptimization
self = stack_pointer[-1 - oparg];
func = stack_pointer[-2 - oparg];
self = PyStackRef_FromPyObjectNew(((PyMethodObject *)callable_o)->im_self);
func = PyStackRef_FromPyObjectNew(((PyMethodObject *)callable_o)->im_func);
PyStackRef_CLOSE(callable);
// self may be unused in tier 1, so silence warnings.
(void)self;
stack_pointer[-2 - oparg] = func;
stack_pointer[-1 - oparg] = self;
break;