/usr/lib/gcc/classfile.py is in libgcj-common 1:4.9.3-9ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 | ## Copyright (C) 2004, 2005 Red Hat, Inc.
## Written by Gary Benson <gbenson@redhat.com>
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
"""Read Java(TM) class files."""
import cStringIO as StringIO
import struct
class Class:
def __init__(self, arg):
if hasattr(arg, "read"):
self.fp = arg
elif type(arg) == type(""):
if arg.startswith("\xca\xfe\xba\xbe"):
self.fp = StringIO.StringIO(arg)
else:
self.fp = open(arg, "r")
else:
raise TypeError, type(arg)
magic = self._read_int()
assert magic == 0xcafebabeL
minor, major = self._read(">HH")
self.version = (major, minor)
self.pool_integrity_checks = None
try:
assert False
except AssertionError:
self.pool_integrity_checks = []
self._read_constants_pool()
self.access_flags = self._read_short()
self.name = self._read_reference_Class()
self.super = self._read_reference_Class()
self.interfaces = self._read_interfaces()
self.fields = self._read_fieldsormethods()
self.methods = self._read_fieldsormethods()
self.attributes = self._read_attributes()
if self.pool_integrity_checks is not None:
for index, tag in self.pool_integrity_checks:
assert self.constants[index][0] == tag
del self.fp, self.pool_integrity_checks
def __repr__(self):
result = []
attrs = [attr for attr in dir(self)
if not attr.startswith("_") and attr != "Member"]
attrs.sort()
for attr in attrs:
result.append("%-13s %s" % (
attr + ":", attr == "constants" and
"<ELIDED>" or repr(getattr(self, attr))))
return "\n".join(result)
def _read_constants_pool(self):
self.constants = {}
skip = False
for i in xrange(1, self._read_short()):
if skip:
skip = False
continue
tag = {
1: "Utf8", 3: "Integer", 4: "Float", 5: "Long",
6: "Double", 7: "Class", 8: "String", 9: "Fieldref",
10: "Methodref", 11: "InterfaceMethodref",
12: "NameAndType"}[self._read_byte()]
skip = tag in ("Long", "Double") # crack crack crack!
self.constants[i] = (tag, getattr(self, "_read_constant_" + tag)())
def _read_interfaces(self):
result = []
for i in xrange(self._read_short()):
result.append(self._read_reference_Class())
return result
def _read_fieldsormethods(self):
result = []
for i in xrange(self._read_short()):
result.append(self.Member(self))
return result
class Member:
def __init__(self, source):
self.access_flags = source._read_short()
self.name = source._read_reference_Utf8()
self.descriptor = source._read_reference_Utf8()
self.attributes = source._read_attributes()
def __repr__(self):
result = []
attrs = [attr for attr in dir(self) if not attr.startswith("_")]
attrs.sort()
for attr in attrs:
value = getattr(self, attr)
if attr == "attributes" and value.has_key("Code"):
value = value.copy()
value.update({"Code": "<ELIDED>"})
result.append("%-13s %s" % (
attr + ":", repr(value).replace(
"'Code': '<ELIDED>'", "'Code': <ELIDED>")))
return ("\n%s" % (15 * " ")).join(result)
def _read_attributes(self):
result = {}
for i in xrange(self._read_short()):
name = self._read_reference_Utf8()
data = self.fp.read(self._read_int())
assert not result.has_key(name)
result[name] = data
return result
# Constants pool reference reader convenience functions
def _read_reference_Utf8(self):
return self._read_references("Utf8")[0]
def _read_reference_Class(self):
return self._read_references("Class")[0]
def _read_reference_Class_NameAndType(self):
return self._read_references("Class", "NameAndType")
def _read_references(self, *args):
result = []
for arg in args:
index = self._read_short()
if self.pool_integrity_checks is not None:
self.pool_integrity_checks.append((index, arg))
result.append(index)
return result
# Constants pool constant reader functions
def _read_constant_Utf8(self):
constant = self.fp.read(self._read_short())
try:
constant = constant.decode("utf-8")
except UnicodeError:
constant = _bork_utf8_decode(constant)
try:
constant = constant.encode("us-ascii")
except UnicodeError:
pass
return constant
def _read_constant_Integer(self):
return self._read_int()
def _read_constant_Float(self):
return self._read(">f")[0]
def _read_constant_Long(self):
return self._read(">q")[0]
def _read_constant_Double(self):
return self._read(">d")[0]
_read_constant_Class = _read_reference_Utf8
_read_constant_String = _read_reference_Utf8
_read_constant_Fieldref = _read_reference_Class_NameAndType
_read_constant_Methodref = _read_reference_Class_NameAndType
_read_constant_InterfaceMethodref = _read_reference_Class_NameAndType
def _read_constant_NameAndType(self):
return self._read_reference_Utf8(), self._read_reference_Utf8()
# Generic reader functions
def _read_int(self):
# XXX how else to read 32 bits on a 64-bit box?
h, l = map(long, self._read(">HH"))
return (h << 16) + l
def _read_short(self):
return self._read(">H")[0]
def _read_byte(self):
return self._read("B")[0]
def _read(self, fmt):
return struct.unpack(fmt, self.fp.read(struct.calcsize(fmt)))
def _bork_utf8_decode(data):
# more crack!
bytes, unicode = map(ord, data), ""
while bytes:
b1 = bytes.pop(0)
if b1 & 0x80:
assert b1 & 0x40
b2 = bytes.pop(0)
assert b2 & 0xC0 == 0x80
if b1 & 0x20:
assert not b1 & 0x10
b3 = bytes.pop(0)
assert b3 & 0xC0 == 0x80
unicode += unichr(
((b1 & 0x0f) << 12) + ((b2 & 0x3f) << 6) + (b3 & 0x3f))
else:
unicode += unichr(((b1 & 0x1f) << 6) + (b2 & 0x3f))
else:
unicode += unichr(b1)
return unicode
if __name__ == "__main__":
print Class("/usr/share/katana/build/ListDependentClasses.class")
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