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v0.5.1
v0.5.1
https://github.com/python/cpython
Revision a40c793d06ee2b42a5013015352616b4ca6b288b authored by Tim Peters on 05 September 2001, 22:36:56 UTC, committed by Tim Peters on 05 September 2001, 22:36:56 UTC
requires that errno ever get set, and it looks like glibc is already playing that game. New rules: + Never use HUGE_VAL. Use the new Py_HUGE_VAL instead. + Never believe errno. If overflow is the only thing you're interested in, use the new Py_OVERFLOWED(x) macro. If you're interested in any libm errors, use the new Py_SET_ERANGE_IF_OVERFLOW(x) macro, which attempts to set errno the way C89 said it worked. Unfortunately, none of these are reliable, but they work on Windows and I *expect* under glibc too.
1 parent 75ed167
Tip revision: a40c793d06ee2b42a5013015352616b4ca6b288b authored by Tim Peters on 05 September 2001, 22:36:56 UTC
Rework the way we try to check for libm overflow, given that C99 no longer
Rework the way we try to check for libm overflow, given that C99 no longer
Tip revision: a40c793
py_compile.py
"""Routine to "compile" a .py file to a .pyc (or .pyo) file.
This module has intimate knowledge of the format of .pyc files.
"""
import imp
MAGIC = imp.get_magic()
__all__ = ["compile"]
def wr_long(f, x):
"""Internal; write a 32-bit int to a file in little-endian order."""
f.write(chr( x & 0xff))
f.write(chr((x >> 8) & 0xff))
f.write(chr((x >> 16) & 0xff))
f.write(chr((x >> 24) & 0xff))
def compile(file, cfile=None, dfile=None):
"""Byte-compile one Python source file to Python bytecode.
Arguments:
file: source filename
cfile: target filename; defaults to source with 'c' or 'o' appended
('c' normally, 'o' in optimizing mode, giving .pyc or .pyo)
dfile: purported filename; defaults to source (this is the filename
that will show up in error messages)
Note that it isn't necessary to byte-compile Python modules for
execution efficiency -- Python itself byte-compiles a module when
it is loaded, and if it can, writes out the bytecode to the
corresponding .pyc (or .pyo) file.
However, if a Python installation is shared between users, it is a
good idea to byte-compile all modules upon installation, since
other users may not be able to write in the source directories,
and thus they won't be able to write the .pyc/.pyo file, and then
they would be byte-compiling every module each time it is loaded.
This can slow down program start-up considerably.
See compileall.py for a script/module that uses this module to
byte-compile all installed files (or all files in selected
directories).
"""
import os, marshal, __builtin__
f = open(file)
try:
timestamp = long(os.fstat(f.fileno())[8])
except AttributeError:
timestamp = long(os.stat(file)[8])
codestring = f.read()
# If parsing from a string, line breaks are \n (see parsetok.c:tok_nextc)
# Replace will return original string if pattern is not found, so
# we don't need to check whether it is found first.
codestring = codestring.replace("\r\n","\n")
codestring = codestring.replace("\r","\n")
f.close()
if codestring and codestring[-1] != '\n':
codestring = codestring + '\n'
try:
codeobject = __builtin__.compile(codestring, dfile or file, 'exec')
except SyntaxError, detail:
import traceback, sys
lines = traceback.format_exception_only(SyntaxError, detail)
for line in lines:
sys.stderr.write(line.replace('File "<string>"',
'File "%s"' % (dfile or file)))
return
if not cfile:
cfile = file + (__debug__ and 'c' or 'o')
fc = open(cfile, 'wb')
fc.write('\0\0\0\0')
wr_long(fc, timestamp)
marshal.dump(codeobject, fc)
fc.flush()
fc.seek(0, 0)
fc.write(MAGIC)
fc.close()
if os.name == 'mac':
import macfs
macfs.FSSpec(cfile).SetCreatorType('Pyth', 'PYC ')
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