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python.py
558 lines (479 loc) · 19.6 KB
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python.py
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"""
Python compiled source code parser.
Informations:
- Python 2.4.2 source code:
files Python/marshal.c and Python/import.c
Author: Victor Stinner
Creation: 25 march 2005
"""
from hachoir.parser import Parser
from hachoir.field import (
FieldSet, UInt8,
UInt16, Int32, UInt32, Int64, UInt64,
ParserError, Float64,
Character, RawBytes, PascalString8, TimestampUnix32,
Bit, String, NullBits)
from hachoir.core.endian import LITTLE_ENDIAN
from hachoir.core.bits import long2raw
from hachoir.core.text_handler import textHandler, hexadecimal
DISASSEMBLE = False
if DISASSEMBLE:
from dis import dis
def disassembleBytecode(field):
bytecode = field.value
dis(bytecode)
# --- String and string reference ---
def parseString(parent):
yield UInt32(parent, "length", "Length")
length = parent["length"].value
if parent.name == "lnotab":
bytecode_offset = 0
line_number = parent['../firstlineno'].value
for i in range(0, length, 2):
bc_off_delta = UInt8(parent, 'bytecode_offset_delta[]')
yield bc_off_delta
bytecode_offset += bc_off_delta.value
bc_off_delta._description = 'Bytecode Offset %i' % bytecode_offset
line_number_delta = UInt8(parent, 'line_number_delta[]')
yield line_number_delta
line_number += line_number_delta.value
line_number_delta._description = 'Line Number %i' % line_number
elif 0 < length:
yield RawBytes(parent, "text", length, "Content")
if DISASSEMBLE and parent.name == "compiled_code":
disassembleBytecode(parent["text"])
def parseStringRef(parent):
yield textHandler(UInt32(parent, "ref"), hexadecimal)
def createStringRefDesc(parent):
return "String ref: %s" % parent["ref"].display
# --- Integers ---
def parseInt32(parent):
yield Int32(parent, "value")
def parseInt64(parent):
yield Int64(parent, "value")
def parseLong(parent):
yield Int32(parent, "digit_count")
for index in range(abs(parent["digit_count"].value)):
yield UInt16(parent, "digit[]")
# --- Float and complex ---
def parseFloat(parent):
yield PascalString8(parent, "value")
def parseBinaryFloat(parent):
yield Float64(parent, "value")
def parseComplex(parent):
yield PascalString8(parent, "real")
yield PascalString8(parent, "complex")
def parseBinaryComplex(parent):
yield Float64(parent, "real")
yield Float64(parent, "complex")
# --- Tuple and list ---
def parseTuple(parent):
yield UInt32(parent, "count", "Item count")
count = parent["count"].value
if count < 0:
raise ParserError("Invalid tuple/list count")
for index in range(count):
yield Object(parent, "item[]")
def parseSmallTuple(parent):
yield UInt8(parent, "count", "Item count")
count = parent["count"].value
if count < 0:
raise ParserError("Invalid tuple/list count")
for index in range(count):
yield Object(parent, "item[]")
def createTupleDesc(parent):
count = parent["count"].value
items = "%s items" % count
return "%s: %s" % (parent.code_info[2], items)
# --- Dict ---
def parseDict(parent):
"""
Format is: (key1, value1, key2, value2, ..., keyn, valuen, NULL)
where each keyi and valuei is an object.
"""
parent.count = 0
while True:
key = Object(parent, "key[]")
yield key
if key["bytecode"].value == "0":
break
yield Object(parent, "value[]")
parent.count += 1
def createDictDesc(parent):
return "Dict: %s" % ("%s keys" % parent.count)
def parseRef(parent):
yield UInt32(parent, "n", "Reference")
def parseShortASCII(parent):
size = UInt8(parent, "len", "Number of ASCII characters")
yield size
yield String(parent, "text", size.value, "String content", charset="ASCII")
# --- Code ---
def parseCode(parent):
version = parent.root.getVersion()
if 0x3000000 <= version:
yield UInt32(parent, "arg_count", "Argument count")
if 0x3080000 <= version:
yield UInt32(parent, "posonlyargcount", "Positional only argument count")
yield UInt32(parent, "kwonlyargcount", "Keyword only argument count")
if version < 0x30B0000:
yield UInt32(parent, "nb_locals", "Number of local variables")
yield UInt32(parent, "stack_size", "Stack size")
yield UInt32(parent, "flags")
elif 0x2030000 <= version:
yield UInt32(parent, "arg_count", "Argument count")
yield UInt32(parent, "nb_locals", "Number of local variables")
yield UInt32(parent, "stack_size", "Stack size")
yield UInt32(parent, "flags")
else:
yield UInt16(parent, "arg_count", "Argument count")
yield UInt16(parent, "nb_locals", "Number of local variables")
yield UInt16(parent, "stack_size", "Stack size")
yield UInt16(parent, "flags")
yield Object(parent, "compiled_code")
yield Object(parent, "consts")
yield Object(parent, "names")
if 0x30B0000 <= version:
yield Object(parent, "co_localsplusnames")
yield Object(parent, "co_localspluskinds")
else:
yield Object(parent, "varnames")
if 0x2000000 <= version:
yield Object(parent, "freevars")
yield Object(parent, "cellvars")
yield Object(parent, "filename")
yield Object(parent, "name")
if 0x30B0000 <= version:
yield Object(parent, "qualname")
if 0x2030000 <= version:
yield UInt32(parent, "firstlineno", "First line number")
else:
yield UInt16(parent, "firstlineno", "First line number")
if 0x30A0000 <= version:
yield Object(parent, "linetable")
if 0x30B0000 <= version:
yield Object(parent, "exceptiontable")
else:
yield Object(parent, "lnotab")
class Object(FieldSet):
bytecode_info = {
# Don't contains any data
'0': ("null", None, "NULL", None),
'N': ("none", None, "None", None),
'F': ("false", None, "False", None),
'T': ("true", None, "True", None),
'S': ("stop_iter", None, "StopIter", None),
'.': ("ellipsis", None, "ELLIPSIS", None),
'?': ("unknown", None, "Unknown", None),
'i': ("int32", parseInt32, "Int32", None),
'I': ("int64", parseInt64, "Int64", None),
'f': ("float", parseFloat, "Float", None),
'g': ("bin_float", parseBinaryFloat, "Binary float", None),
'x': ("complex", parseComplex, "Complex", None),
'y': ("bin_complex", parseBinaryComplex, "Binary complex", None),
'l': ("long", parseLong, "Long", None),
's': ("string", parseString, "String", None),
't': ("interned", parseString, "Interned", None),
'u': ("unicode", parseString, "Unicode", None),
'R': ("string_ref", parseStringRef, "String ref", createStringRefDesc),
'(': ("tuple", parseTuple, "Tuple", createTupleDesc),
')': ("small_tuple", parseSmallTuple, "Tuple", createTupleDesc),
'[': ("list", parseTuple, "List", createTupleDesc),
'<': ("set", parseTuple, "Set", createTupleDesc),
'>': ("frozenset", parseTuple, "Frozen set", createTupleDesc),
'{': ("dict", parseDict, "Dict", createDictDesc),
'c': ("code", parseCode, "Code", None),
'r': ("ref", parseRef, "Reference", None),
'z': ("short_ascii", parseShortASCII, "Short ASCII", None),
'Z': ("short_ascii_interned", parseShortASCII, "Short ASCII interned", None),
}
def __init__(self, parent, name, **kw):
FieldSet.__init__(self, parent, name, **kw)
code = self["bytecode"].value
if code not in self.bytecode_info:
raise ParserError('Unknown bytecode %r at position %s'
% (code, self.absolute_address // 8))
self.code_info = self.bytecode_info[code]
if not name:
self._name = self.code_info[0]
if code == "l":
self.createValue = self.createValueLong
elif code in ("i", "I", "f", "g"):
self.createValue = lambda: self["value"].value
elif code == "T":
self.createValue = lambda: True
elif code == "F":
self.createValue = lambda: False
elif code in ("x", "y"):
self.createValue = self.createValueComplex
elif code in ("s", "t", "u"):
self.createValue = self.createValueString
self.createDisplay = self.createDisplayString
if code == 't':
if not hasattr(self.root, 'string_table'):
self.root.string_table = []
self.root.string_table.append(self)
elif code == 'R':
if hasattr(self.root, 'string_table'):
self.createValue = self.createValueStringRef
def createValueString(self):
if "text" in self:
return self["text"].value
else:
return ""
def createDisplayString(self):
if "text" in self:
return self["text"].display
else:
return "(empty)"
def createValueLong(self):
is_negative = self["digit_count"].value < 0
count = abs(self["digit_count"].value)
total = 0
for index in range(count - 1, -1, -1):
total <<= 15
total += self["digit[%u]" % index].value
if is_negative:
total = -total
return total
def createValueStringRef(self):
return self.root.string_table[self['ref'].value].value
def createDisplayStringRef(self):
return self.root.string_table[self['ref'].value].display
def createValueComplex(self):
return complex(
float(self["real"].value),
float(self["complex"].value))
def createFields(self):
yield BytecodeChar(self, "bytecode", "Bytecode")
yield Bit(self, "flag_ref", "Is a reference?")
parser = self.code_info[1]
if parser:
yield from parser(self)
def createDescription(self):
create = self.code_info[3]
if create:
return create(self)
else:
return self.code_info[2]
class BytecodeChar(Character):
static_size = 7
PY_RELEASE_LEVEL_ALPHA = 0xA
PY_RELEASE_LEVEL_FINAL = 0xF
def VERSION(major, minor, release_level=PY_RELEASE_LEVEL_FINAL, serial=0):
micro = 0
return ((major << 24) + (minor << 16) + (micro << 8)
+ (release_level << 4) + (serial << 0))
class PythonCompiledFile(Parser):
PARSER_TAGS = {
"id": "python",
"category": "program",
"file_ext": ("pyc", "pyo"),
"min_size": 9 * 8,
"description": "Compiled Python script (.pyc/.pyo files)"
}
endian = LITTLE_ENDIAN
# Dictionnary which associate the pyc signature (32-bit integer)
# to a Python version string (eg. "m\xf2\r\n" => "Python 2.4b1").
# This list comes from CPython source code, see MAGIC_NUMBER
# in file Lib/importlib/_bootstrap_external.py
MAGIC = {
# Python 1.x
20121: ("1.5", 0x1050000),
50428: ("1.6", 0x1060000),
# Python 2.x
50823: ("2.0", 0x2000000),
60202: ("2.1", 0x2010000),
60717: ("2.2", 0x2020000),
62011: ("2.3a0", 0x2030000),
62021: ("2.3a0", 0x2030000),
62041: ("2.4a0", 0x2040000),
62051: ("2.4a3", 0x2040000),
62061: ("2.4b1", 0x2040000),
62071: ("2.5a0", 0x2050000),
62081: ("2.5a0 (ast-branch)", 0x2050000),
62091: ("2.5a0 (with)", 0x2050000),
62092: ("2.5a0 (WITH_CLEANUP opcode)", 0x2050000),
62101: ("2.5b3", 0x2050000),
62111: ("2.5b3", 0x2050000),
62121: ("2.5c1", 0x2050000),
62131: ("2.5c2", 0x2050000),
62151: ("2.6a0", 0x2070000),
62161: ("2.6a1", 0x2070000),
62171: ("2.7a0", 0x2070000),
62181: ("2.7a0", 0x2070000),
62191: ("2.7a0", 0x2070000),
62201: ("2.7a0", 0x2070000),
62211: ("2.7a0", 0x2070000),
# Python 3.x
3000: ("3.0 (3000)", 0x3000000),
3010: ("3.0 (3010)", 0x3000000),
3020: ("3.0 (3020)", 0x3000000),
3030: ("3.0 (3030)", 0x3000000),
3040: ("3.0 (3040)", 0x3000000),
3050: ("3.0 (3050)", 0x3000000),
3060: ("3.0 (3060)", 0x3000000),
3061: ("3.0 (3061)", 0x3000000),
3071: ("3.0 (3071)", 0x3000000),
3081: ("3.0 (3081)", 0x3000000),
3091: ("3.0 (3091)", 0x3000000),
3101: ("3.0 (3101)", 0x3000000),
3103: ("3.0 (3103)", 0x3000000),
3111: ("3.0a4", 0x3000000),
3131: ("3.0a5", 0x3000000),
3141: ("3.1a0", 0x3010000),
3151: ("3.1a0", 0x3010000),
3160: ("3.2a0", 0x3020000),
3170: ("3.2a1", 0x3020000),
3180: ("3.2a2", 0x3020000),
3190: ("Python 3.3a0", 0x3030000),
3200: ("Python 3.3a0 ", 0x3030000),
3210: ("Python 3.3a0 ", 0x3030000),
3220: ("Python 3.3a1 ", 0x3030000),
3230: ("Python 3.3a4 ", 0x3030000),
3250: ("Python 3.4a1 ", 0x3040000),
3260: ("Python 3.4a1 ", 0x3040000),
3270: ("Python 3.4a1 ", 0x3040000),
3280: ("Python 3.4a1 ", 0x3040000),
3290: ("Python 3.4a4 ", 0x3040000),
3300: ("Python 3.4a4 ", 0x3040000),
3310: ("Python 3.4rc2", 0x3040000),
3320: ("Python 3.5a0 ", 0x3050000),
3330: ("Python 3.5b1 ", 0x3050000),
3340: ("Python 3.5b2 ", 0x3050000),
3350: ("Python 3.5b2 ", 0x3050000),
3351: ("Python 3.5.2 ", 0x3050000),
3360: ("Python 3.6a0 ", 0x3060000),
3361: ("Python 3.6a0 ", 0x3060000),
3370: ("Python 3.6a1 ", 0x3060000),
3371: ("Python 3.6a1 ", 0x3060000),
3372: ("Python 3.6a1 ", 0x3060000),
3373: ("Python 3.6b1 ", 0x3060000),
3375: ("Python 3.6b1 ", 0x3060000),
3376: ("Python 3.6b1 ", 0x3060000),
3377: ("Python 3.6b1 ", 0x3060000),
3378: ("Python 3.6b2 ", 0x3060000),
3379: ("Python 3.6rc1", 0x3060000),
3390: ("Python 3.7a1", 0x30700A1),
3391: ("Python 3.7a2", 0x30700A2),
3392: ("Python 3.7a4", 0x30700A4),
3393: ("Python 3.7b1", 0x30700B1),
3394: ("Python 3.7b5", 0x30700B5),
3400: ("Python 3.8a1", VERSION(3, 8)),
3401: ("Python 3.8a1", VERSION(3, 8)),
3410: ("Python 3.8a1", VERSION(3, 8)),
3411: ("Python 3.8b2", VERSION(3, 8)),
3412: ("Python 3.8b2", VERSION(3, 8)),
3413: ("Python 3.8b4", VERSION(3, 8)),
3420: ("Python 3.9a0", VERSION(3, 9)),
3421: ("Python 3.9a0", VERSION(3, 9)),
3422: ("Python 3.9a0", VERSION(3, 9)),
3423: ("Python 3.9a2", VERSION(3, 9)),
3424: ("Python 3.9a2", VERSION(3, 9)),
3425: ("Python 3.9a2", VERSION(3, 9)),
3430: ("Python 3.10a1", VERSION(3, 10)),
3431: ("Python 3.10a1", VERSION(3, 10)),
3432: ("Python 3.10a2", VERSION(3, 10)),
3433: ("Python 3.10a2", VERSION(3, 10)),
3434: ("Python 3.10a6", VERSION(3, 10)),
3435: ("Python 3.10a7", VERSION(3, 10)),
3436: ("Python 3.10b1", VERSION(3, 10)),
3437: ("Python 3.10b1", VERSION(3, 10)),
3438: ("Python 3.10b1", VERSION(3, 10)),
3439: ("Python 3.10b1", VERSION(3, 10)),
3450: ("Python 3.11a1", VERSION(3, 11)),
3451: ("Python 3.11a1", VERSION(3, 11)),
3452: ("Python 3.11a1", VERSION(3, 11)),
3453: ("Python 3.11a1", VERSION(3, 11)),
3454: ("Python 3.11a1", VERSION(3, 11)),
3455: ("Python 3.11a1", VERSION(3, 11)),
3456: ("Python 3.11a1", VERSION(3, 11)),
3457: ("Python 3.11a1", VERSION(3, 11)),
3458: ("Python 3.11a1", VERSION(3, 11)),
3459: ("Python 3.11a1", VERSION(3, 11)),
3460: ("Python 3.11a1", VERSION(3, 11)),
3461: ("Python 3.11a1", VERSION(3, 11)),
3462: ("Python 3.11a2", VERSION(3, 11)),
3463: ("Python 3.11a3", VERSION(3, 11)),
3464: ("Python 3.11a3", VERSION(3, 11)),
3465: ("Python 3.11a3", VERSION(3, 11)),
3466: ("Python 3.11a4", VERSION(3, 11)),
3467: ("Python 3.11a4", VERSION(3, 11)),
3468: ("Python 3.11a4", VERSION(3, 11)),
3469: ("Python 3.11a4", VERSION(3, 11)),
3470: ("Python 3.11a4", VERSION(3, 11)),
3471: ("Python 3.11a4", VERSION(3, 11)),
3472: ("Python 3.11a4", VERSION(3, 11)),
3473: ("Python 3.11a4", VERSION(3, 11)),
3474: ("Python 3.11a4", VERSION(3, 11)),
3475: ("Python 3.11a5", VERSION(3, 11)),
3476: ("Python 3.11a5", VERSION(3, 11)),
3477: ("Python 3.11a5", VERSION(3, 11)),
3478: ("Python 3.11a5", VERSION(3, 11)),
3479: ("Python 3.11a5", VERSION(3, 11)),
3480: ("Python 3.11a5", VERSION(3, 11)),
3481: ("Python 3.11a5", VERSION(3, 11)),
3482: ("Python 3.11a5", VERSION(3, 11)),
3483: ("Python 3.11a5", VERSION(3, 11)),
3484: ("Python 3.11a5", VERSION(3, 11)),
3485: ("Python 3.11a5", VERSION(3, 11)),
3486: ("Python 3.11a6", VERSION(3, 11)),
3487: ("Python 3.11a6", VERSION(3, 11)),
3488: ("Python 3.11a6", VERSION(3, 11)),
3489: ("Python 3.11a6", VERSION(3, 11)),
3490: ("Python 3.11a6", VERSION(3, 11)),
3491: ("Python 3.11a6", VERSION(3, 11)),
3492: ("Python 3.11a7", VERSION(3, 11)),
3493: ("Python 3.11a7", VERSION(3, 11)),
3494: ("Python 3.11a7", VERSION(3, 11)),
3500: ("Python 3.12a1", VERSION(3, 12)),
3501: ("Python 3.12a1", VERSION(3, 12)),
3502: ("Python 3.12a1", VERSION(3, 12)),
3503: ("Python 3.12a1", VERSION(3, 12)),
3504: ("Python 3.12a1", VERSION(3, 12)),
3505: ("Python 3.12a1", VERSION(3, 12)),
3506: ("Python 3.12a1", VERSION(3, 12)),
3507: ("Python 3.12a1", VERSION(3, 12)),
3508: ("Python 3.12a1", VERSION(3, 12)),
3509: ("Python 3.12a1", VERSION(3, 12)),
3510: ("Python 3.12a1", VERSION(3, 12)),
3511: ("Python 3.12a1", VERSION(3, 12)),
}
# Dictionnary which associate the pyc signature (4-byte long string)
# to a Python version string (eg. "m\xf2\r\n" => "2.4b1")
STR_MAGIC = dict(
(long2raw(magic | (ord('\r') << 16) |
(ord('\n') << 24), LITTLE_ENDIAN), value[0])
for magic, value in MAGIC.items())
def validate(self):
magic_number = self["magic_number"].value
if magic_number not in self.MAGIC:
return "Unknown magic number (%s)" % magic_number
if self["magic_string"].value != "\r\n":
return r"Wrong magic string (\r\n)"
if self["content/bytecode"].value != "c":
return "First object bytecode is not code"
return True
def getVersion(self):
if not hasattr(self, "version"):
signature = self.stream.readBits(0, 16, self.endian)
self.version = self.MAGIC[signature][1]
return self.version
def createFields(self):
yield UInt16(self, "magic_number", "Magic number")
yield String(self, "magic_string", 2, r"Magic string \r\n", charset="ASCII")
version = self.getVersion()
# PEP 552: Deterministic pycs #31650 (Python 3.7a4); magic=3392
if version >= 0x30700A4:
yield Bit(self, "use_hash", "Is hash based?")
yield Bit(self, "checked")
yield NullBits(self, "reserved", 30)
use_hash = self['use_hash'].value
else:
use_hash = False
if use_hash:
yield UInt64(self, "hash")
else:
yield TimestampUnix32(self, "timestamp", "Timestamp modulo 2**32")
if version >= 0x3030000 and self['magic_number'].value >= 3200:
yield UInt32(self, "filesize", "Size of the Python source file (.py) modulo 2**32")
yield Object(self, "content")