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GH-103488: Use return-offset, not yield-offset. #103502

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Merged
merged 4 commits into from
Apr 13, 2023
Merged

GH-103488: Use return-offset, not yield-offset. #103502

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dc9fee6
Use return-offset, not yield-offset, so that instruction pointer is c…
markshannon Apr 12, 2023
c86c721
Set return_offset on call, instead of resetting it on return.
markshannon Apr 12, 2023
b4afef3
Add news
markshannon Apr 12, 2023
18fad80
Add explanatory comment for return_offset.
markshannon Apr 12, 2023
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Use return-offset, not yield-offset, so that instruction pointer is c… 
…orrect when sending to a generator or coroutine.
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@markshannon
markshannon committed Apr 12, 2023
commit dc9fee6a5d4641dc29ffc910eb799504f99a8b8f
4 changes: 2 additions & 2 deletions Include/internal/pycore_frame.h
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Original file line number Diff line number Diff line change
Expand Up @@ -61,7 +61,7 @@ typedef struct _PyInterpreterFrame {
// over, or (in the case of a newly-created frame) a totally invalid value:
_Py_CODEUNIT *prev_instr;
int stacktop; /* Offset of TOS from localsplus */
uint16_t yield_offset;
uint16_t return_offset;
char owner;
/* Locals and stack */
PyObject *localsplus[1];
Expand Down Expand Up @@ -121,7 +121,7 @@ _PyFrame_Initialize(
frame->stacktop = code->co_nlocalsplus;
frame->frame_obj = NULL;
frame->prev_instr = _PyCode_CODE(code) - 1;
frame->yield_offset = 0;
frame->return_offset = 0;
frame->owner = FRAME_OWNED_BY_THREAD;

for (int i = null_locals_from; i < code->co_nlocalsplus; i++) {
Expand Down
15 changes: 15 additions & 0 deletions Lib/test/test_generators.py
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Expand Up @@ -225,7 +225,22 @@ def f():
gi = f()
self.assertIsNone(gi.gi_frame.f_back)

def test_issue103488(self):

def gen_raises():
yield
raise ValueError()

def loop():
try:
for _ in gen_raises():
if True is False:
return
except ValueError:
pass

#This should not raise
loop()

class ExceptionTest(unittest.TestCase):
# Tests for the issue #23353: check that the currently handled exception
Expand Down
29 changes: 19 additions & 10 deletions Python/bytecodes.c
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Expand Up @@ -637,6 +637,8 @@ dummy_func(
_PyInterpreterFrame *dying = frame;
frame = cframe.current_frame = dying->previous;
_PyEvalFrameClearAndPop(tstate, dying);
frame->prev_instr += frame->return_offset;
frame->return_offset = 0;
_PyFrame_StackPush(frame, retval);
goto resume_frame;
}
Expand All @@ -655,6 +657,8 @@ dummy_func(
_PyInterpreterFrame *dying = frame;
frame = cframe.current_frame = dying->previous;
_PyEvalFrameClearAndPop(tstate, dying);
frame->prev_instr += frame->return_offset;
frame->return_offset = 0;
_PyFrame_StackPush(frame, retval);
goto resume_frame;
}
Expand All @@ -670,6 +674,8 @@ dummy_func(
_PyInterpreterFrame *dying = frame;
frame = cframe.current_frame = dying->previous;
_PyEvalFrameClearAndPop(tstate, dying);
frame->prev_instr += frame->return_offset;
frame->return_offset = 0;
_PyFrame_StackPush(frame, retval);
goto resume_frame;
}
Expand All @@ -689,6 +695,8 @@ dummy_func(
_PyInterpreterFrame *dying = frame;
frame = cframe.current_frame = dying->previous;
_PyEvalFrameClearAndPop(tstate, dying);
frame->prev_instr += frame->return_offset;
frame->return_offset = 0;
_PyFrame_StackPush(frame, retval);
goto resume_frame;
}
Expand Down Expand Up @@ -823,13 +831,13 @@ dummy_func(
{
PyGenObject *gen = (PyGenObject *)receiver;
_PyInterpreterFrame *gen_frame = (_PyInterpreterFrame *)gen->gi_iframe;
frame->yield_offset = oparg;
frame->return_offset = oparg;
STACK_SHRINK(1);
_PyFrame_StackPush(gen_frame, v);
gen->gi_frame_state = FRAME_EXECUTING;
gen->gi_exc_state.previous_item = tstate->exc_info;
tstate->exc_info = &gen->gi_exc_state;
JUMPBY(INLINE_CACHE_ENTRIES_SEND + oparg);
JUMPBY(INLINE_CACHE_ENTRIES_SEND);
DISPATCH_INLINED(gen_frame);
}
if (Py_IsNone(v) && PyIter_Check(receiver)) {
Expand Down Expand Up @@ -861,13 +869,13 @@ dummy_func(
DEOPT_IF(gen->gi_frame_state >= FRAME_EXECUTING, SEND);
STAT_INC(SEND, hit);
_PyInterpreterFrame *gen_frame = (_PyInterpreterFrame *)gen->gi_iframe;
frame->yield_offset = oparg;
frame->return_offset = oparg;
STACK_SHRINK(1);
_PyFrame_StackPush(gen_frame, v);
gen->gi_frame_state = FRAME_EXECUTING;
gen->gi_exc_state.previous_item = tstate->exc_info;
tstate->exc_info = &gen->gi_exc_state;
JUMPBY(INLINE_CACHE_ENTRIES_SEND + oparg);
JUMPBY(INLINE_CACHE_ENTRIES_SEND);
DISPATCH_INLINED(gen_frame);
}

Expand All @@ -886,7 +894,7 @@ dummy_func(
_PyInterpreterFrame *gen_frame = frame;
frame = cframe.current_frame = frame->previous;
gen_frame->previous = NULL;
frame->prev_instr -= frame->yield_offset;
frame->return_offset = 0;
_PyFrame_StackPush(frame, retval);
goto resume_frame;
}
Expand All @@ -905,7 +913,7 @@ dummy_func(
_PyInterpreterFrame *gen_frame = frame;
frame = cframe.current_frame = frame->previous;
gen_frame->previous = NULL;
frame->prev_instr -= frame->yield_offset;
frame->return_offset = 0;
_PyFrame_StackPush(frame, retval);
goto resume_frame;
}
Expand Down Expand Up @@ -2259,14 +2267,14 @@ dummy_func(
DEOPT_IF(gen->gi_frame_state >= FRAME_EXECUTING, FOR_ITER);
STAT_INC(FOR_ITER, hit);
_PyInterpreterFrame *gen_frame = (_PyInterpreterFrame *)gen->gi_iframe;
frame->yield_offset = oparg;
frame->return_offset = oparg;
_PyFrame_StackPush(gen_frame, Py_NewRef(Py_None));
gen->gi_frame_state = FRAME_EXECUTING;
gen->gi_exc_state.previous_item = tstate->exc_info;
tstate->exc_info = &gen->gi_exc_state;
JUMPBY(INLINE_CACHE_ENTRIES_FOR_ITER + oparg);
assert(next_instr->op.code == END_FOR ||
next_instr->op.code == INSTRUMENTED_END_FOR);
JUMPBY(INLINE_CACHE_ENTRIES_FOR_ITER);
assert(next_instr[oparg].op.code == END_FOR ||
next_instr[oparg].op.code == INSTRUMENTED_END_FOR);
DISPATCH_INLINED(gen_frame);
}

Expand Down Expand Up @@ -3114,6 +3122,7 @@ dummy_func(
_PyThreadState_PopFrame(tstate, frame);
frame = cframe.current_frame = prev;
_PyFrame_StackPush(frame, (PyObject *)gen);
assert(frame->return_offset == 0);
goto resume_frame;
}

Expand Down
3 changes: 2 additions & 1 deletion Python/ceval.c
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Expand Up @@ -672,7 +672,7 @@ _PyEval_EvalFrameDefault(PyThreadState *tstate, _PyInterpreterFrame *frame, int
_PyCode_CODE(tstate->interp->interpreter_trampoline);
entry_frame.stacktop = 0;
entry_frame.owner = FRAME_OWNED_BY_CSTACK;
entry_frame.yield_offset = 0;
entry_frame.return_offset = 0;
/* Push frame */
entry_frame.previous = prev_cframe->current_frame;
frame->previous = &entry_frame;
Expand Down Expand Up @@ -881,6 +881,7 @@ _PyEval_EvalFrameDefault(PyThreadState *tstate, _PyInterpreterFrame *frame, int
_PyInterpreterFrame *dying = frame;
frame = cframe.current_frame = dying->previous;
_PyEvalFrameClearAndPop(tstate, dying);
frame->return_offset = 0;
if (frame == &entry_frame) {
/* Restore previous cframe and exit */
tstate->cframe = cframe.previous;
Expand Down
2 changes: 1 addition & 1 deletion Python/ceval_macros.h
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Expand Up @@ -72,7 +72,7 @@
#endif

#if USE_COMPUTED_GOTOS
# define TARGET(op) TARGET_##op: INSTRUCTION_START(op);
# define TARGET(op) TARGET_##op: INSTRUCTION_START(op); assert(frame->return_offset == 0);
# define DISPATCH_GOTO() goto *opcode_targets[opcode]
#else
# define TARGET(op) case op: TARGET_##op: INSTRUCTION_START(op);
Expand Down
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