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Issue #13645: pyc files now contain the size of the corresponding source

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code, to avoid timestamp collisions (especially on filesystems with a low
timestamp resolution) when checking for freshness of the bytecode.
This commit is contained in:
Antoine Pitrou 2012-01-13 18:52:16 +01:00
parent 1f918c1480
commit 5136ac0ca2
14 changed files with 167 additions and 49 deletions
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7
Lib/py_compile.py
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@ -110,9 +110,11 @@ def compile(file, cfile=None, dfile=None, doraise=False, optimize=-1):
"""
with tokenize.open(file) as f:
try:
timestamp = int(os.fstat(f.fileno()).st_mtime)
st = os.fstat(f.fileno())
except AttributeError:
timestamp = int(os.stat(file).st_mtime)
st = os.stat(file)
timestamp = int(st.st_mtime)
size = st.st_size & 0xFFFFFFFF
codestring = f.read()
try:
codeobject = builtins.compile(codestring, dfile or file, 'exec',
@ -139,6 +141,7 @@ def compile(file, cfile=None, dfile=None, doraise=False, optimize=-1):
with open(cfile, 'wb') as fc:
fc.write(b'\0\0\0\0')
wr_long(fc, timestamp)
wr_long(fc, size)
marshal.dump(codeobject, fc)
fc.flush()
fc.seek(0, 0)