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GH-101291: Rearrange the size bits in PyLongObject (GH-102464)

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* Eliminate all remaining uses of Py_SIZE and Py_SET_SIZE on PyLongObject, adding asserts.

* Change layout of size/sign bits in longobject to support future addition of immortal ints and tagged medium ints.

* Add functions to hide some internals of long object, and for setting sign and digit count.

* Replace uses of IS_MEDIUM_VALUE macro with _PyLong_IsCompact().
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Mark Shannon 2023-03-22 14:49:51 +00:00 • committed by GitHub
parent 713df2c534
commit 7559f5fda9
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25 changed files with 982 additions and 898 deletions
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26
Tools/gdb/libpython.py
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@ -882,10 +882,16 @@ class PyLongObjectPtr(PyObjectPtr):
def proxyval(self, visited):
'''
Python's Include/longobjrep.h has this declaration:
struct _longobject {
PyObject_VAR_HEAD
digit ob_digit[1];
};
typedef struct _PyLongValue {
uintptr_t lv_tag; /* Number of digits, sign and flags */
digit ob_digit[1];
} _PyLongValue;
struct _longobject {
PyObject_HEAD
_PyLongValue long_value;
};
with this description:
The absolute value of a number is equal to
@ -897,11 +903,13 @@ class PyLongObjectPtr(PyObjectPtr):
#define PyLong_SHIFT 30
#define PyLong_SHIFT 15
'''
ob_size = int(self.field('ob_size'))
if ob_size == 0:
long_value = self.field('long_value')
lv_tag = int(long_value['lv_tag'])
size = lv_tag >> 3
if size == 0:
return 0
ob_digit = self.field('long_value')['ob_digit']
ob_digit = long_value['ob_digit']
if gdb.lookup_type('digit').sizeof == 2:
SHIFT = 15
@ -909,9 +917,9 @@ class PyLongObjectPtr(PyObjectPtr):
SHIFT = 30
digits = [int(ob_digit[i]) * 2**(SHIFT*i)
for i in safe_range(abs(ob_size))]
for i in safe_range(size)]
result = sum(digits)
if ob_size < 0:
if (lv_tag & 3) == 2:
result = -result
return result