#! /usr/libexec/platform-python

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#

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# Copyright (c) 2005-2007 Niels Provos <provos@citi.umich.edu>

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# Copyright (c) 2007-2012 Niels Provos and Nick Mathewson

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# All rights reserved.

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#

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# Generates marshaling code based on libevent.

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# TODO:

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# 1) use optparse to allow the strategy shell to parse options, and

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# to allow the instantiated factory (for the specific output language)

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# to parse remaining options

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# 2) move the globals into a class that manages execution (including the

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# progress outputs that space stderr at the moment)

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# 3) emit other languages

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import sys

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import re

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_NAME = "event_rpcgen.py"

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_VERSION = "0.1"

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# Globals

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line_count = 0

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white = re.compile(r'\s+')

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cppcomment = re.compile(r'\/\/.*$')

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nonident = re.compile(r'[^a-zA-Z0-9_]')

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structref = re.compile(r'^struct\[([a-zA-Z_][a-zA-Z0-9_]*)\]$')

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structdef = re.compile(r'^struct +[a-zA-Z_][a-zA-Z0-9_]* *{$')

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headerdirect = []

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cppdirect = []

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QUIETLY = 0

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def declare(s):

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if not QUIETLY:

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print(s)

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def TranslateList(mylist, mydict):

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return [x % mydict for x in mylist]

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# Exception class for parse errors

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class RpcGenError(Exception):

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def __init__(self, why):

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self.why = why

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def __str__(self):

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return str(self.why)

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# Holds everything that makes a struct

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class Struct:

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def __init__(self, name):

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self._name = name

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self._entries = []

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self._tags = {}

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declare(' Created struct: %s' % name)

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def AddEntry(self, entry):

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if entry.Tag() in self._tags:

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raise RpcGenError(

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'Entry "%s" duplicates tag number %d from "%s" '

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'around line %d' % (entry.Name(), entry.Tag(),

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self._tags[entry.Tag()], line_count))

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self._entries.append(entry)

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self._tags[entry.Tag()] = entry.Name()

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declare(' Added entry: %s' % entry.Name())

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def Name(self):

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return self._name

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def EntryTagName(self, entry):

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"""Creates the name inside an enumeration for distinguishing data

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types."""

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name = "%s_%s" % (self._name, entry.Name())

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return name.upper()

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def PrintIndented(self, file, ident, code):

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"""Takes an array, add indentation to each entry and prints it."""

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for entry in code:

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file.write('%s%s\n' % (ident, entry))

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class StructCCode(Struct):

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""" Knows how to generate C code for a struct """

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def __init__(self, name):

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Struct.__init__(self, name)

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def PrintTags(self, file):

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"""Prints the tag definitions for a structure."""

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file.write('/* Tag definition for %s */\n' % self._name)

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file.write('enum %s_ {\n' % self._name.lower())

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for entry in self._entries:

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file.write(' %s=%d,\n' % (self.EntryTagName(entry), entry.Tag()))

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file.write(' %s_MAX_TAGS\n' % (self._name.upper()))

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file.write('};\n\n')

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def PrintForwardDeclaration(self, file):

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file.write('struct %s;\n' % self._name)

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def PrintDeclaration(self, file):

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file.write('/* Structure declaration for %s */\n' % self._name)

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file.write('struct %s_access_ {\n' % self._name)

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for entry in self._entries:

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dcl = entry.AssignDeclaration('(*%s_assign)' % entry.Name())

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dcl.extend(

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entry.GetDeclaration('(*%s_get)' % entry.Name()))

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if entry.Array():

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dcl.extend(

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entry.AddDeclaration('(*%s_add)' % entry.Name()))

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self.PrintIndented(file, ' ', dcl)

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file.write('};\n\n')

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file.write('struct %s {\n' % self._name)

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file.write(' struct %s_access_ *base;\n\n' % self._name)

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for entry in self._entries:

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dcl = entry.Declaration()

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self.PrintIndented(file, ' ', dcl)

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file.write('\n')

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for entry in self._entries:

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file.write(' ev_uint8_t %s_set;\n' % entry.Name())

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file.write('};\n\n')

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file.write("""struct %(name)s *%(name)s_new(void);

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struct %(name)s *%(name)s_new_with_arg(void *);

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void %(name)s_free(struct %(name)s *);

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void %(name)s_clear(struct %(name)s *);

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void %(name)s_marshal(struct evbuffer *, const struct %(name)s *);

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int %(name)s_unmarshal(struct %(name)s *, struct evbuffer *);

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int %(name)s_complete(struct %(name)s *);

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void evtag_marshal_%(name)s(struct evbuffer *, ev_uint32_t,

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const struct %(name)s *);

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int evtag_unmarshal_%(name)s(struct evbuffer *, ev_uint32_t,

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struct %(name)s *);\n""" % { 'name' : self._name })

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# Write a setting function of every variable

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for entry in self._entries:

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self.PrintIndented(file, '', entry.AssignDeclaration(

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entry.AssignFuncName()))

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self.PrintIndented(file, '', entry.GetDeclaration(

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entry.GetFuncName()))

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if entry.Array():

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self.PrintIndented(file, '', entry.AddDeclaration(

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entry.AddFuncName()))

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file.write('/* --- %s done --- */\n\n' % self._name)

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def PrintCode(self, file):

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file.write(('/*\n'

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' * Implementation of %s\n'

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' */\n\n') % self._name)

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file.write('static struct %(name)s_access_ %(name)s_base__ = {\n' % \

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{ 'name' : self._name })

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for entry in self._entries:

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self.PrintIndented(file, ' ', entry.CodeBase())

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file.write('};\n\n')

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# Creation

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file.write((

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'struct %(name)s *\n'

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'%(name)s_new(void)\n'

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'{\n'

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' return %(name)s_new_with_arg(NULL);\n'

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'}\n'

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'\n'

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'struct %(name)s *\n'

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'%(name)s_new_with_arg(void *unused)\n'

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'{\n'

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' struct %(name)s *tmp;\n'

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' if ((tmp = malloc(sizeof(struct %(name)s))) == NULL) {\n'

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' event_warn("%%s: malloc", __func__);\n'

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' return (NULL);\n'

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' }\n'

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' tmp->base = &%(name)s_base__;\n\n') % { 'name' : self._name })

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for entry in self._entries:

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self.PrintIndented(file, ' ', entry.CodeInitialize('tmp'))

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file.write(' tmp->%s_set = 0;\n\n' % entry.Name())

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file.write((

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' return (tmp);\n'

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'}\n\n'))

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# Adding

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for entry in self._entries:

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if entry.Array():

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self.PrintIndented(file, '', entry.CodeAdd())

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file.write('\n')

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# Assigning

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for entry in self._entries:

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self.PrintIndented(file, '', entry.CodeAssign())

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file.write('\n')

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# Getting

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for entry in self._entries:

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self.PrintIndented(file, '', entry.CodeGet())

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file.write('\n')

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# Clearing

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file.write(( 'void\n'

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'%(name)s_clear(struct %(name)s *tmp)\n'

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'{'

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'\n') % { 'name' : self._name })

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for entry in self._entries:

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self.PrintIndented(file, ' ', entry.CodeClear('tmp'))

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file.write('}\n\n')

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# Freeing

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file.write(( 'void\n'

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'%(name)s_free(struct %(name)s *tmp)\n'

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'{'

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'\n') % { 'name' : self._name })

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for entry in self._entries:

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self.PrintIndented(file, ' ', entry.CodeFree('tmp'))

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file.write((' free(tmp);\n'

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'}\n\n'))

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# Marshaling

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file.write(('void\n'

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'%(name)s_marshal(struct evbuffer *evbuf, '

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'const struct %(name)s *tmp)'

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'{\n') % { 'name' : self._name })

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for entry in self._entries:

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indent = ' '

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# Optional entries do not have to be set

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if entry.Optional():

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indent += ' '

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file.write(' if (tmp->%s_set) {\n' % entry.Name())

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self.PrintIndented(

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file, indent,

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entry.CodeMarshal('evbuf', self.EntryTagName(entry),

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entry.GetVarName('tmp'),

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entry.GetVarLen('tmp')))

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if entry.Optional():

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file.write(' }\n')

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file.write('}\n\n')

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# Unmarshaling

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file.write(('int\n'

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'%(name)s_unmarshal(struct %(name)s *tmp, '

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' struct evbuffer *evbuf)\n'

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'{\n'

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' ev_uint32_t tag;\n'

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' while (evbuffer_get_length(evbuf) > 0) {\n'

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' if (evtag_peek(evbuf, &tag) == -1)\n'

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' return (-1);\n'

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' switch (tag) {\n'

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'\n') % { 'name' : self._name })

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for entry in self._entries:

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file.write(' case %s:\n' % self.EntryTagName(entry))

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if not entry.Array():

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file.write((

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' if (tmp->%s_set)\n'

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' return (-1);'

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'\n') % (entry.Name()))

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self.PrintIndented(

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file, ' ',

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entry.CodeUnmarshal('evbuf',

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self.EntryTagName(entry),

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entry.GetVarName('tmp'),

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entry.GetVarLen('tmp')))

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file.write(( ' tmp->%s_set = 1;\n' % entry.Name() +

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' break;\n' ))

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file.write(( ' default:\n'

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' return -1;\n'

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' }\n'

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' }\n\n' ))

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# Check if it was decoded completely

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file.write(( ' if (%(name)s_complete(tmp) == -1)\n'

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' return (-1);'

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'\n') % { 'name' : self._name })

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# Successfully decoded

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file.write(( ' return (0);\n'

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'}\n\n'))

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# Checking if a structure has all the required data

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file.write((

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'int\n'

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'%(name)s_complete(struct %(name)s *msg)\n'

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'{\n' ) % { 'name' : self._name })

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for entry in self._entries:

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if not entry.Optional():

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code = [

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'if (!msg->%(name)s_set)',

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' return (-1);' ]

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code = TranslateList(code, entry.GetTranslation())

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self.PrintIndented(

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file, ' ', code)

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self.PrintIndented(

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file, ' ',

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entry.CodeComplete('msg', entry.GetVarName('msg')))

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file.write((

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' return (0);\n'

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'}\n\n' ))

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# Complete message unmarshaling

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file.write((

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'int\n'

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'evtag_unmarshal_%(name)s(struct evbuffer *evbuf, '

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'ev_uint32_t need_tag, struct %(name)s *msg)\n'

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'{\n'

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' ev_uint32_t tag;\n'

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' int res = -1;\n'

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'\n'

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' struct evbuffer *tmp = evbuffer_new();\n'

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'\n'

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' if (evtag_unmarshal(evbuf, &tag, tmp) == -1'

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' || tag != need_tag)\n'

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' goto error;\n'

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'\n'

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' if (%(name)s_unmarshal(msg, tmp) == -1)\n'

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' goto error;\n'

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'\n'

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' res = 0;\n'

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'\n'

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' error:\n'

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' evbuffer_free(tmp);\n'

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' return (res);\n'

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'}\n\n' ) % { 'name' : self._name })

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# Complete message marshaling

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file.write((

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'void\n'

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'evtag_marshal_%(name)s(struct evbuffer *evbuf, ev_uint32_t tag, '

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'const struct %(name)s *msg)\n'

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'{\n'

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' struct evbuffer *buf_ = evbuffer_new();\n'

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' assert(buf_ != NULL);\n'

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' %(name)s_marshal(buf_, msg);\n'

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' evtag_marshal_buffer(evbuf, tag, buf_);\n '

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' evbuffer_free(buf_);\n'

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'}\n\n' ) % { 'name' : self._name })

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class Entry:

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def __init__(self, type, name, tag):

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self._type = type

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self._name = name

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self._tag = int(tag)

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self._ctype = type

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self._optional = 0

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self._can_be_array = 0

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self._array = 0

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self._line_count = -1

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self._struct = None

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self._refname = None

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self._optpointer = True

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self._optaddarg = True

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def GetInitializer(self):

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assert 0, "Entry does not provide initializer"

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def SetStruct(self, struct):

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self._struct = struct

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def LineCount(self):

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assert self._line_count != -1

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return self._line_count

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def SetLineCount(self, number):

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self._line_count = number

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def Array(self):

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return self._array

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def Optional(self):

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return self._optional

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def Tag(self):

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return self._tag

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def Name(self):

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return self._name

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def Type(self):

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return self._type

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def MakeArray(self, yes=1):

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self._array = yes

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def MakeOptional(self):

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self._optional = 1

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def Verify(self):

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if self.Array() and not self._can_be_array:

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raise RpcGenError(

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'Entry "%s" cannot be created as an array '

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'around line %d' % (self._name, self.LineCount()))

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if not self._struct:

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raise RpcGenError(

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'Entry "%s" does not know which struct it belongs to '

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'around line %d' % (self._name, self.LineCount()))

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if self._optional and self._array:

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raise RpcGenError(

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'Entry "%s" has illegal combination of optional and array '

[405] Fix | Delete

'around line %d' % (self._name, self.LineCount()))

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def GetTranslation(self, extradict = {}):

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mapping = {

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"parent_name" : self._struct.Name(),

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"name" : self._name,

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"ctype" : self._ctype,

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"refname" : self._refname,

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"optpointer" : self._optpointer and "*" or "",

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"optreference" : self._optpointer and "&" or "",

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"optaddarg" :

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self._optaddarg and ", const %s value" % self._ctype or ""

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}

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for (k, v) in list(extradict.items()):

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mapping[k] = v

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return mapping

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def GetVarName(self, var):

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return '%(var)s->%(name)s_data' % self.GetTranslation({ 'var' : var })

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def GetVarLen(self, var):

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return 'sizeof(%s)' % self._ctype

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def GetFuncName(self):

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return '%s_%s_get' % (self._struct.Name(), self._name)

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def GetDeclaration(self, funcname):

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code = [ 'int %s(struct %s *, %s *);' % (

[434] Fix | Delete

funcname, self._struct.Name(), self._ctype ) ]

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return code

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def CodeGet(self):

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code = (

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'int',

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'%(parent_name)s_%(name)s_get(struct %(parent_name)s *msg, '

[441] Fix | Delete

'%(ctype)s *value)',

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'{',

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' if (msg->%(name)s_set != 1)',

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' return (-1);',

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' *value = msg->%(name)s_data;',

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' return (0);',

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'}' )

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code = '\n'.join(code)

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code = code % self.GetTranslation()

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return code.split('\n')

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[452] Fix | Delete

def AssignFuncName(self):

[453] Fix | Delete

return '%s_%s_assign' % (self._struct.Name(), self._name)

[454] Fix | Delete

[455] Fix | Delete

def AddFuncName(self):

[456] Fix | Delete

return '%s_%s_add' % (self._struct.Name(), self._name)

[457] Fix | Delete

[458] Fix | Delete

def AssignDeclaration(self, funcname):

[459] Fix | Delete

code = [ 'int %s(struct %s *, const %s);' % (

[460] Fix | Delete

funcname, self._struct.Name(), self._ctype ) ]

[461] Fix | Delete

return code

[462] Fix | Delete

[463] Fix | Delete

def CodeAssign(self):

[464] Fix | Delete

code = [ 'int',

[465] Fix | Delete

'%(parent_name)s_%(name)s_assign(struct %(parent_name)s *msg,'

[466] Fix | Delete

' const %(ctype)s value)',

[467] Fix | Delete

'{',

[468] Fix | Delete

' msg->%(name)s_set = 1;',

[469] Fix | Delete

' msg->%(name)s_data = value;',

[470] Fix | Delete

' return (0);',

[471] Fix | Delete

'}' ]

[472] Fix | Delete

code = '\n'.join(code)

[473] Fix | Delete

code = code % self.GetTranslation()

[474] Fix | Delete

return code.split('\n')

[475] Fix | Delete

[476] Fix | Delete

def CodeClear(self, structname):

[477] Fix | Delete

code = [ '%s->%s_set = 0;' % (structname, self.Name()) ]

[478] Fix | Delete

[479] Fix | Delete

return code

[480] Fix | Delete

[481] Fix | Delete

def CodeComplete(self, structname, var_name):

[482] Fix | Delete

return []

[483] Fix | Delete

[484] Fix | Delete

def CodeFree(self, name):

[485] Fix | Delete

return []

[486] Fix | Delete

[487] Fix | Delete

def CodeBase(self):

[488] Fix | Delete

code = [

[489] Fix | Delete

'%(parent_name)s_%(name)s_assign,',

[490] Fix | Delete

'%(parent_name)s_%(name)s_get,'

[491] Fix | Delete

]

[492] Fix | Delete

if self.Array():

[493] Fix | Delete

code.append('%(parent_name)s_%(name)s_add,')

[494] Fix | Delete

[495] Fix | Delete

code = '\n'.join(code)

[496] Fix | Delete

code = code % self.GetTranslation()

[497] Fix | Delete

return code.split('\n')

[498] Fix | Delete

[499] Fix | Delete