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bpo-46443: deepfreeze: use small ints and singleton zero bytes (GH-30715)

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Kumar Aditya 2022-01-20 11:43:21 +05:30 • committed by GitHub
parent 263c0dd160
commit 194ecc6d44
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2 changed files with 6 additions and 0 deletions
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Misc/NEWS.d/next/Build/2022-01-20-05-27-07.bpo-46443.udCVII.rst Normal file
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@ -0,0 +1 @@
Deepfreeze now uses cached small integers as it saves some space for common small integers.

5
Tools/scripts/deepfreeze.py
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@ -113,6 +113,7 @@ class Printer:
self.write('#include "Python.h"') self.write('#include "Python.h"')
self.write('#include "internal/pycore_gc.h"') self.write('#include "internal/pycore_gc.h"')
self.write('#include "internal/pycore_code.h"') self.write('#include "internal/pycore_code.h"')
self.write('#include "internal/pycore_long.h"')
self.write("") self.write("")
@contextlib.contextmanager @contextlib.contextmanager
@ -148,6 +149,8 @@ class Printer:
self.write(f".{name} = {getattr(obj, name)},") self.write(f".{name} = {getattr(obj, name)},")
def generate_bytes(self, name: str, b: bytes) -> str: def generate_bytes(self, name: str, b: bytes) -> str:
if b == b"":
return "(PyObject *)&_Py_SINGLETON(bytes_empty)"
self.write("static") self.write("static")
with self.indent(): with self.indent():
with self.block("struct"): with self.block("struct"):
@ -313,6 +316,8 @@ class Printer:
self.write(f".ob_digit = {{ {ds} }},") self.write(f".ob_digit = {{ {ds} }},")
def generate_int(self, name: str, i: int) -> str: def generate_int(self, name: str, i: int) -> str:
if -5 <= i <= 256:
return f"(PyObject *)&_PyLong_SMALL_INTS[_PY_NSMALLNEGINTS + {i}]"
if abs(i) < 2**15: if abs(i) < 2**15:
self._generate_int_for_bits(name, i, 2**15) self._generate_int_for_bits(name, i, 2**15)
else: else: