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Add Python object dump tool

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This commit is contained in:
Justine Tunney 2021-08-17 12:11:29 -07:00
parent f66ef5d58e
commit 38aece42ba
1 changed files with 54 additions and 0 deletions
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third_party/python/pydump.py vendored Normal file
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# read a .pyc file and pretty-print it
# copied from https://gist.github.com/twerp/fdc9975f0461821fcd3d7679d1f0f7e9
# copied from http://nedbatchelder.com/blog/200804/the_structure_of_pyc_files.html
# and updated to Python 3.5 (Nov 10th 2015)
import dis, marshal, struct, sys, time, types, binascii
def show_file(fname):
f = open(fname, "rb")
magic = f.read(4)
moddate = f.read(4)
filesz = f.read(4)
modtime = time.asctime(time.localtime(struct.unpack('=L', moddate)[0]))
filesz = struct.unpack('=L', filesz)
print("magic %s" % (binascii.hexlify(magic)))
print("moddate %s (%s)" % (binascii.hexlify(moddate), modtime))
print("files sz %d" % filesz)
code = marshal.load(f)
show_code(code)
def show_code(code, indent=''):
print("%scode" % indent)
indent += ' '
print("%sargcount %d" % (indent, code.co_argcount))
print("%snlocals %d" % (indent, code.co_nlocals))
print("%sstacksize %d" % (indent, code.co_stacksize))
print("%sflags %04x" % (indent, code.co_flags))
show_hex("code", code.co_code, indent=indent)
dis.disassemble(code)
print("%sconsts" % indent)
for const in code.co_consts:
if type(const) == types.CodeType:
show_code(const, indent+' ')
else:
print(" %s%r" % (indent, const))
print("%snames %r" % (indent, code.co_names))
print("%svarnames %r" % (indent, code.co_varnames))
print("%sfreevars %r" % (indent, code.co_freevars))
print("%scellvars %r" % (indent, code.co_cellvars))
print("%sfilename %r" % (indent, code.co_filename))
print("%sname %r" % (indent, code.co_name))
print("%sfirstlineno %d" % (indent, code.co_firstlineno))
show_hex("lnotab", code.co_lnotab, indent=indent)
def show_hex(label, h, indent):
h = binascii.hexlify(h)
if len(h) < 60:
print("%s%s %s" % (indent, label, h))
else:
print("%s%s" % (indent, label))
for i in range(0, len(h), 60):
print("%s %s" % (indent, h[i:i+60]))
show_file(sys.argv[1])