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bpo-46443: deepfreeze use preallocated small ints #30715

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merged 4 commits into from
Jan 20, 2022
Merged

bpo-46443: deepfreeze use preallocated small ints #30715

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7fb3f22
deepfreeze use preallocated small ints
kumaraditya303 Jan 20, 2022
462b899
📜🤖 Added by blurb_it.
blurb-it[bot] Jan 20, 2022
1dfecc0
use cached empty bytes object
kumaraditya303 Jan 20, 2022
b55621b
Merge branch 'longobj' of https://github.com/kumaraditya303/cpython i…
kumaraditya303 Jan 20, 2022
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Build/2022-01-20-05-27-07.bpo-46443.udCVII.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Deepfreeze now uses cached small integers as it saves some space for common small integers.
5 changes: 5 additions & 0 deletions Tools/scripts/deepfreeze.py
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Expand Up @@ -113,6 +113,7 @@ def __init__(self, file: TextIO):
self.write('#include "Python.h"')
self.write('#include "internal/pycore_gc.h"')
self.write('#include "internal/pycore_code.h"')
self.write('#include "internal/pycore_long.h"')
self.write("")

@contextlib.contextmanager
Expand Down Expand Up @@ -148,6 +149,8 @@ def field(self, obj: object, name: str) -> None:
self.write(f".{name} = {getattr(obj, name)},")

def generate_bytes(self, name: str, b: bytes) -> str:
if b == b"":
return "(PyObject *)&_Py_SINGLETON(bytes_empty)"
self.write("static")
with self.indent():
with self.block("struct"):
Expand Down Expand Up @@ -313,6 +316,8 @@ def _generate_int_for_bits(self, name: str, i: int, digit: int) -> None:
self.write(f".ob_digit = {{ {ds} }},")

def generate_int(self, name: str, i: int) -> str:
if -5 <= i <= 256:
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return f"(PyObject *)&_PyLong_SMALL_INTS[_PY_NSMALLNEGINTS + {i}]"
if abs(i) < 2**15:
self._generate_int_for_bits(name, i, 2**15)
else:
Expand Down