From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- libjava/contrib/classfile.py | 221 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 221 insertions(+) create mode 100644 libjava/contrib/classfile.py (limited to 'libjava/contrib/classfile.py') diff --git a/libjava/contrib/classfile.py b/libjava/contrib/classfile.py new file mode 100644 index 000000000..a8bb14c0b --- /dev/null +++ b/libjava/contrib/classfile.py @@ -0,0 +1,221 @@ +## Copyright (C) 2004, 2005 Free Software Foundation +## Written by Gary Benson +## +## 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 + "" 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": ""}) + result.append("%-13s %s" % ( + attr + ":", repr(value).replace( + "'Code': ''", "'Code': "))) + 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") + -- cgit v1.2.3