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GH-98831: Add DECREF_INPUTS(), expanding to DECREF() each stack input#100205

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Merged
gvanrossum merged 1 commit into from
Dec 17, 2022
Merged

GH-98831: Add DECREF_INPUTS(), expanding to DECREF() each stack input #100205

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31 changes: 13 additions & 18 deletions Python/bytecodes.c
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Original file line numberDiff line numberDiff line change
Expand Up@@ -161,7 +161,7 @@ dummy_func(
super(LOAD_CONST__LOAD_FAST) = LOAD_CONST + LOAD_FAST;

inst(POP_TOP, (value --)) {
Py_DECREF(value);
DECREF_INPUTS();
}

inst(PUSH_NULL, (-- res)) {
Expand All@@ -172,19 +172,19 @@ dummy_func(

inst(UNARY_POSITIVE, (value -- res)) {
res = PyNumber_Positive(value);
Py_DECREF(value);
DECREF_INPUTS();
ERROR_IF(res == NULL, error);
}

inst(UNARY_NEGATIVE, (value -- res)) {
res = PyNumber_Negative(value);
Py_DECREF(value);
DECREF_INPUTS();
ERROR_IF(res == NULL, error);
}

inst(UNARY_NOT, (value -- res)) {
int err = PyObject_IsTrue(value);
Py_DECREF(value);
DECREF_INPUTS();
ERROR_IF(err < 0, error);
if (err == 0) {
res = Py_True;
Expand All@@ -197,7 +197,7 @@ dummy_func(

inst(UNARY_INVERT, (value -- res)) {
res = PyNumber_Invert(value);
Py_DECREF(value);
DECREF_INPUTS();
ERROR_IF(res == NULL, error);
}

Expand DownExpand Up@@ -351,8 +351,7 @@ dummy_func(
STAT_INC(BINARY_SUBSCR, deferred);
DECREMENT_ADAPTIVE_COUNTER(cache->counter);
res = PyObject_GetItem(container, sub);
Py_DECREF(container);
Py_DECREF(sub);
DECREF_INPUTS();
ERROR_IF(res == NULL, error);
}

Expand DownExpand Up@@ -438,8 +437,7 @@ dummy_func(
ERROR_IF(true, error);
}
Py_INCREF(res); // Do this before DECREF'ing dict, sub
Py_DECREF(dict);
Py_DECREF(sub);
DECREF_INPUTS();
}

inst(BINARY_SUBSCR_GETITEM, (unused/1, type_version/2, func_version/1, container, sub -- unused)) {
Expand DownExpand Up@@ -500,9 +498,7 @@ dummy_func(
DECREMENT_ADAPTIVE_COUNTER(cache->counter);
/* container[sub] = v */
int err = PyObject_SetItem(container, sub, v);
Py_DECREF(v);
Py_DECREF(container);
Py_DECREF(sub);
DECREF_INPUTS();
ERROR_IF(err, error);
}

Expand DownExpand Up@@ -538,8 +534,7 @@ dummy_func(
inst(DELETE_SUBSCR, (container, sub --)) {
/* del container[sub] */
int err = PyObject_DelItem(container, sub);
Py_DECREF(container);
Py_DECREF(sub);
DECREF_INPUTS();
ERROR_IF(err, error);
}

Expand All@@ -550,11 +545,11 @@ dummy_func(
if (hook == NULL) {
_PyErr_SetString(tstate, PyExc_RuntimeError,
"lost sys.displayhook");
Py_DECREF(value);
DECREF_INPUTS();
ERROR_IF(true, error);
}
res = PyObject_CallOneArg(hook, value);
Py_DECREF(value);
DECREF_INPUTS();
ERROR_IF(res == NULL, error);
Py_DECREF(res);
}
Expand DownExpand Up@@ -625,12 +620,12 @@ dummy_func(
"'async for' requires an object with "
"__aiter__ method, got %.100s",
type->tp_name);
Py_DECREF(obj);
DECREF_INPUTS();
ERROR_IF(true, error);
}

iter = (*getter)(obj);
Py_DECREF(obj);
DECREF_INPUTS();
ERROR_IF(iter == NULL, error);

if (Py_TYPE(iter)->tp_as_async == NULL ||
Expand Down
6 changes: 5 additions & 1 deletion Tools/cases_generator/generate_cases.py
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Original file line numberDiff line numberDiff line change
Expand Up@@ -209,7 +209,7 @@ def write_body(self, out: Formatter, dedent: int, cache_adjust: int = 0) -> None
cache_offset += ceffect.size
assert cache_offset == self.cache_offset + cache_adjust

# Write the body, substituting a goto for ERROR_IF()
# Write the body, substituting a goto for ERROR_IF() and other stuff
assert dedent <= 0
extra = " " * -dedent
for line in self.block_text:
Expand All@@ -232,6 +232,10 @@ def write_body(self, out: Formatter, dedent: int, cache_adjust: int = 0) -> None
)
else:
out.write_raw(f"{extra}{space}if ({cond}) goto {label};\n")
elif m := re.match(r"(\s*)DECREF_INPUTS\(\);\s*$", line):
space = m.group(1)
for ieff in self.input_effects:
out.write_raw(f"{extra}{space}Py_DECREF({ieff.name});\n")
else:
out.write_raw(extra + line)

Expand Down