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gh-100239: Handle NaN and zero division in guards #128963

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Merged
merged 8 commits into from
Jan 19, 2025
Merged

gh-100239: Handle NaN and zero division in guards #128963

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8547393
Fix zero division
Eclips4 Jan 17, 2025
131b92a
Reorder calls
Eclips4 Jan 17, 2025
8363e9d
Address Irit's review && Add guards for NaN
Eclips4 Jan 17, 2025
850a862
Update Python/specialize.c
Eclips4 Jan 18, 2025
f98667c
Apply the same technique for compactlong_float
Eclips4 Jan 18, 2025
27cd99a
I guess it should work
Eclips4 Jan 18, 2025
aa416bb
Apply suggestions from code review
Eclips4 Jan 19, 2025
127cb30
Address Irit's review
Eclips4 Jan 19, 2025
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13 changes: 13 additions & 0 deletions Lib/test/test_opcache.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1362,6 +1362,19 @@ def binary_op_add_extend():
self.assert_specialized(binary_op_add_extend, "BINARY_OP_EXTEND")
self.assert_no_opcode(binary_op_add_extend, "BINARY_OP")

def compactlong_lhs(arg):
42 / arg
def float_lhs(arg):
42.0 / arg

with self.assertRaises(ZeroDivisionError):
compactlong_lhs(0)
with self.assertRaises(ZeroDivisionError):
compactlong_lhs(0.0)
with self.assertRaises(ZeroDivisionError):
float_lhs(0)
with self.assertRaises(ZeroDivisionError):
float_lhs(0.0)

@cpython_only
@requires_specialization_ft
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28 changes: 26 additions & 2 deletions Python/specialize.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2426,6 +2426,18 @@ float_compactlong_guard(PyObject *lhs, PyObject *rhs)
);
}

static int
float_compactlong_guard_true_div(PyObject *lhs, PyObject *rhs)
{
// guards should check if rhs has a non-zero value
return (
PyFloat_CheckExact(lhs) &&
PyLong_CheckExact(rhs) &&
_PyLong_IsCompact((PyLongObject *)rhs) &&
!PyLong_IsZero(rhs)
);
}

#define FLOAT_LONG_ACTION(NAME, OP) \
static PyObject * \
(NAME)(PyObject *lhs, PyObject *rhs) \
Expand All @@ -2452,6 +2464,18 @@ compactlong_float_guard(PyObject *lhs, PyObject *rhs)
);
}

static int
compactlong_float_guard_true_div(PyObject *lhs, PyObject *rhs)
{
// guards should check if rhs has a non-zero value
return (
PyFloat_CheckExact(rhs) &&
PyLong_CheckExact(lhs) &&
_PyLong_IsCompact((PyLongObject *)lhs) &&
PyFloat_AsDouble(rhs) != 0.0
);
}

#define LONG_FLOAT_ACTION(NAME, OP) \
static PyObject * \
(NAME)(PyObject *lhs, PyObject *rhs) \
Expand All @@ -2469,14 +2493,14 @@ LONG_FLOAT_ACTION(compactlong_float_true_div, /)
static _PyBinaryOpSpecializationDescr float_compactlong_specs[NB_OPARG_LAST+1] = {
[NB_ADD] = {float_compactlong_guard, float_compactlong_add},
[NB_SUBTRACT] = {float_compactlong_guard, float_compactlong_subtract},
[NB_TRUE_DIVIDE] = {float_compactlong_guard, float_compactlong_true_div},
[NB_TRUE_DIVIDE] = {float_compactlong_guard_true_div, float_compactlong_true_div},
[NB_MULTIPLY] = {float_compactlong_guard, float_compactlong_multiply},
};

static _PyBinaryOpSpecializationDescr compactlong_float_specs[NB_OPARG_LAST+1] = {
[NB_ADD] = {compactlong_float_guard, compactlong_float_add},
[NB_SUBTRACT] = {compactlong_float_guard, compactlong_float_subtract},
[NB_TRUE_DIVIDE] = {compactlong_float_guard, compactlong_float_true_div},
[NB_TRUE_DIVIDE] = {compactlong_float_guard_true_div, compactlong_float_true_div},
[NB_MULTIPLY] = {compactlong_float_guard, compactlong_float_multiply},
};

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