#! /usr/bin/env python3
# Read from stdin, spit out C header or body.
import argparse
import copy
import fileinput
import re
from collections import namedtuple
Enumtype = namedtuple('Enumtype', ['name', 'value'])
type2size = {
'pad': 1,
'struct channel_id': 32,
'struct short_channel_id': 8,
'struct ipv6': 16,
'secp256k1_ecdsa_signature': 64,
'struct preimage': 32,
'struct pubkey': 33,
'struct node_id': 33,
'struct sha256': 32,
'struct bitcoin_blkid': 32,
'struct bitcoin_txid': 32,
'struct secret': 32,
'struct amount_msat': 8,
'struct amount_sat': 8,
'u64': 8,
'u32': 4,
'u16': 2,
'u8': 1,
'bool': 1,
'var_int': 8,
}
# These struct array helpers require a context to allocate from.
varlen_structs = [
'peer_features',
'gossip_getnodes_entry',
'gossip_getchannels_entry',
'failed_htlc',
'utxo',
'bitcoin_tx',
'wirestring',
]
class FieldType(object):
def __init__(self, name):
self.name = name
def is_var_int(self):
return self.name == 'var_int'
def is_assignable(self):
return self.name in ['u8', 'u16', 'u32', 'u64', 'bool', 'struct amount_msat', 'struct amount_sat', 'var_int'] or self.name.startswith('enum ')
def needs_ptr(self):
return not self.is_assignable()
# We only accelerate the u8 case: it's common and trivial.
def has_array_helper(self):
return self.name in ['u8']
def base(self):
basetype = self.name
if basetype.startswith('struct '):
basetype = basetype[7:]
elif basetype.startswith('enum '):
basetype = basetype[5:]
elif self.name == 'var_int':
return 'u64'
return basetype
def is_subtype(self):
for subtype in subtypes:
if subtype.name == self.base():
return True
return False
# Returns base size
@staticmethod
def _typesize(typename):
if typename in type2size:
return type2size[typename]
elif typename.startswith('struct ') or typename.startswith('enum '):
# We allow unknown structures/enums, for extensibility (can only happen
# if explicitly specified in csv)
return 0
else:
raise ValueError('Unknown typename {}'.format(typename))
# Full (message, fieldname)-mappings
typemap = {
('update_fail_htlc', 'reason'): FieldType('u8'),
('node_announcement', 'alias'): FieldType('u8'),
('update_add_htlc', 'onion_routing_packet'): FieldType('u8'),
('update_fulfill_htlc', 'payment_preimage'): FieldType('struct preimage'),
('error', 'data'): FieldType('u8'),
('shutdown', 'scriptpubkey'): FieldType('u8'),
('node_announcement', 'rgb_color'): FieldType('u8'),
('node_announcement', 'addresses'): FieldType('u8'),
('node_announcement', 'ipv6'): FieldType('struct ipv6'),
('announcement_signatures', 'short_channel_id'): FieldType('struct short_channel_id'),
('channel_announcement', 'short_channel_id'): FieldType('struct short_channel_id'),
('channel_update', 'short_channel_id'): FieldType('struct short_channel_id'),
('revoke_and_ack', 'per_commitment_secret'): FieldType('struct secret'),
('channel_reestablish_option_data_loss_protect', 'your_last_per_commitment_secret'): FieldType('struct secret'),
('channel_update', 'fee_base_msat'): FieldType('u32'),
('final_incorrect_htlc_amount', 'incoming_htlc_amt'): FieldType('struct amount_msat'),
}
# Partial names that map to a datatype
partialtypemap = {
'signature': FieldType('secp256k1_ecdsa_signature'),
'features': FieldType('u8'),
'channel_id': FieldType('struct channel_id'),
'chain_hash': FieldType('struct bitcoin_blkid'),
'funding_txid': FieldType('struct bitcoin_txid'),
'pad': FieldType('pad'),
'msat': FieldType('struct amount_msat'),
'satoshis': FieldType('struct amount_sat'),
'node_id': FieldType('struct node_id'),
}
# Size to typename match
sizetypemap = {
33: FieldType('struct pubkey'),
32: FieldType('struct sha256'),
8: FieldType('u64'),
4: FieldType('u32'),
2: FieldType('u16'),
1: FieldType('u8')
}
# It would be nicer if we had put '*u8' in spec and disallowed bare lenvar.
# In practice we only recognize lenvar when it's the previous field.
# size := baresize | arraysize
# baresize := simplesize | lenvar
# simplesize := number | type
# arraysize := length '*' type
# length := lenvar | number
class Field(object):
def __init__(self, message, name, size, comments, prevname, includes):
self.message = message
self.comments = comments
self.name = name
self.is_len_var = False
self.lenvar = None
self.num_elems = 1
self.optional = False
self.is_tlv = False
self.is_subtype = False
if name.endswith('_tlv'):
self.is_tlv = True
if self.name not in tlv_fields:
tlv_fields[self.name] = []
# ? means optional field (not supported for arrays)
if size.startswith('?'):
self.optional = True
size = size[1:]
# If it's an arraysize, swallow prefix.
elif '*' in size:
number = size.split('*')[0]
if number == prevname:
self.lenvar = number
else:
self.num_elems = int(number)
size = size.split('*')[1]
elif options.bolt and size == prevname:
# Raw length field, implies u8.
self.lenvar = size
size = '1'
# Bolts use just a number: Guess type based on size.
if options.bolt:
if size == 'var_int':
base_size = 8
self.fieldtype = FieldType(size)
else:
try:
base_size = int(size)
self.fieldtype = Field._guess_type(message, self.name, base_size)
# There are some arrays which we have to guess, based on sizes.
tsize = FieldType._typesize(self.fieldtype.name)
if base_size % tsize != 0:
raise ValueError('Invalid size {} for {}.{} not a multiple of {}'
.format(base_size,
self.message,
self.name,
tsize))
self.num_elems = int(base_size / tsize)
except ValueError: # for subtypes
self.fieldtype = FieldType('struct {}'.format(name))
self.is_subtype = True
else:
# Real typename.
self.fieldtype = FieldType(size)
def is_padding(self):
return self.name.startswith('pad')
# Padding is always treated as an array.
def is_array(self):
return self.num_elems > 1 or self.is_padding()
def is_variable_size(self):
return self.lenvar is not None
def needs_ptr_to_ptr(self):
return self.is_variable_size() or self.optional
def is_assignable(self):
if self.is_array() or self.needs_ptr_to_ptr():
return False
return self.fieldtype.is_assignable()
def has_array_helper(self):
return self.fieldtype.has_array_helper()
# Returns FieldType
@staticmethod
def _guess_type(message, fieldname, base_size):
# Check for full (message, fieldname)-matches
if (message, fieldname) in typemap:
return typemap[(message, fieldname)]
# Check for partial field names
for k, v in partialtypemap.items():
if k in fieldname:
return v
# Check for size matches
if base_size in sizetypemap:
return sizetypemap[base_size]
raise ValueError('Unknown size {} for {}'.format(base_size, fieldname))
fromwire_impl_templ = """bool fromwire_{name}({ctx}const void *p{args})
{{
{fields}
\tconst u8 *cursor = p;
\tsize_t plen = tal_count(p);
\tif (fromwire_u16(&cursor, &plen) != {enum.name})
\t\treturn false;
{subcalls}
\treturn cursor != NULL;
}}
"""
fromwire_tlv_impl_templ = """static bool fromwire_{tlv_name}_{name}({ctx}{args})
{{
\tsize_t start_len = *plen;
{fields}
\tif (start_len < len)
\t\treturn false;
{subcalls}
\treturn cursor != NULL && (start_len - *plen == len);
}}
"""
fromwire_subtype_impl_templ = """{static}bool fromwire_{name}({ctx}{args})
{{
{fields}
{subcalls}
\treturn cursor != NULL;
}}
"""
fromwire_subtype_header_templ = """bool fromwire_{name}({ctx}{args});"""
fromwire_header_templ = """bool fromwire_{name}({ctx}const void *p{args});
"""
towire_header_templ = """u8 *towire_{name}(const tal_t *ctx{args});
"""
towire_impl_templ = """u8 *towire_{name}(const tal_t *ctx{args})
{{
{field_decls}
\tu8 *p = tal_arr(ctx, u8, 0);
\ttowire_u16(&p, {enumname});
{subcalls}
\treturn memcheck(p, tal_count(p));
}}
"""
towire_tlv_templ = """u8 *towire_{name}(const tal_t *ctx{args})
{{
{field_decls}
\tu8 *p = tal_arr(ctx, u8, 0);
\ttowire_u16(&p, {enumname});
\ttowire_u16(&p, {len});
{subcalls}
\treturn memcheck(p, tal_count(p));
}}
"""
fromwire_tlv_templ = """bool frowire_{name}({ctx}const void *p{args})
{{
{fields}
\tconst u8 *cursor = p;
\tsize_t plen = tal_count(p);
\tif (frmwire_u16(&cursor, &plen) != {enum.name})
\t\treturn false;
{subcalls}
\treturn cursor != NULL;
}}
"""
printwire_header_templ = """void printwire_{name}(const char *fieldname, const u8 *cursor);
"""
printwire_toplevel_tmpl = """\tsize_t plen = tal_count(cursor);
\tif (fromwire_u16(&cursor, &plen) != {enum.name}) {{
\t\tprintf("WRONG TYPE?!\\n");
\t\treturn;
\t}}"""
printwire_impl_templ = """{is_internal}void printwire_{name}(const char *fieldname, const u8 *{cursor_ptr}cursor{tlv_args})
{{
{toplevel_msg_setup}{subcalls}{lencheck}
}}
"""
printwire_lencheck = """
\tif (plen != 0)
\t\tprintf("EXTRA: %s\\n", tal_hexstr(NULL, cursor, plen));
"""
class CCode(object):
"""Simple class to create indented C code"""
def __init__(self):
self.indent = 1
self.single_indent = False
self.code = []
def append(self, lines):
for line in lines.split('\n'):
# Let us to the indenting please!
assert '\t' not in line
# Special case: } by itself is pre-unindented.
if line == '}':
self.indent -= 1
self.code.append("\t" * self.indent + line)
continue
self.code.append("\t" * self.indent + line)
if self.single_indent:
self.indent -= 1
self.single_indent = False
if line.endswith('{'):
self.indent += 1
elif line.endswith('}'):
self.indent -= 1
elif line.startswith('for') or line.startswith('if'):
self.indent += 1
self.single_indent = True
def __str__(self):
assert self.indent == 1
assert not self.single_indent
return '\n'.join(self.code)
class Message(object):
def __init__(self, name, enum, comments, is_tlv=False):
self.name = name
self.enum = enum
self.comments = comments
self.fields = []
self.has_variable_fields = False
self.is_tlv = is_tlv
def checkLenField(self, field):
# Optional fields don't have a len.
if field.optional:
return
for f in self.fields:
if f.name == field.lenvar:
if not (f.fieldtype.name == 'u16' or f.fieldtype.name == 'var_int') and options.bolt:
raise ValueError('Field {} has non-u16 and non-var_int length variable {} (type {})'
.format(field.name, field.lenvar, f.fieldtype.name))
if f.is_array() or f.needs_ptr_to_ptr():
raise ValueError('Field {} has non-simple length variable {}'
.format(field.name, field.lenvar))
f.is_len_var = True
f.lenvar_for = field
return
raise ValueError('Field {} unknown length variable {}'
.format(field.name, field.lenvar))
def addField(self, field):
# We assume field lengths are 16 bit, to avoid overflow issues and
# massive allocations.
if field.is_variable_size():
self.checkLenField(field)
self.has_variable_fields = True
elif field.fieldtype.base() in varlen_structs or field.optional:
self.has_variable_fields = True
self.fields.append(field)
def print_fromwire_array(self, ctx, subcalls, basetype, f, name, num_elems, is_embedded=False):
p_ref = '' if is_embedded else '&'
if f.has_array_helper():
subcalls.append('fromwire_{}_array({}cursor, {}plen, {}, {});'
.format(basetype, p_ref, p_ref, name, num_elems))
else:
subcalls.append('for (size_t i = 0; i < {}; i++)'
.format(num_elems))
if f.fieldtype.is_assignable():
subcalls.append('({})[i] = fromwire_{}({}cursor, {}plen);'
.format(name, basetype, p_ref, p_ref))
elif basetype in varlen_structs:
subcalls.append('({})[i] = fromwire_{}({}, {}cursor, {}plen);'
.format(name, basetype, ctx, p_ref, p_ref))
else:
ctx_arg = ctx + ', ' if f.fieldtype.is_subtype() else ''
subcalls.append('fromwire_{}({}{}cursor, {}plen, {} + i);'
.format(basetype, ctx_arg, p_ref, p_ref, name))
def print_fromwire(self, is_header):
ctx_arg = 'const tal_t *ctx, ' if self.has_variable_fields else ''
args = []
for f in self.fields:
if f.is_len_var or f.is_padding():
continue
elif f.is_array():
args.append(', {} {}[{}]'.format(f.fieldtype.name, f.name, f.num_elems))
elif f.is_tlv:
args.append(', struct {} *{}'.format(f.name, f.name))
else:
ptrs = '*'
# If we're handing a variable array, we need a ptr-to-ptr.
if f.needs_ptr_to_ptr():
ptrs += '*'
# If each type is a variable length, we need a ptr to that.
if f.fieldtype.base() in varlen_structs:
ptrs += '*'
args.append(', {} {}{}'.format(f.fieldtype.name, ptrs, f.name))
template = fromwire_header_templ if is_header else fromwire_impl_templ
fields = ['\t{} {};\n'.format(f.fieldtype.base(), f.name) for f in self.fields if f.is_len_var]
subcalls = CCode()
for f in self.fields:
basetype = f.fieldtype.base()
if f.fieldtype.is_var_int():
basetype = 'var_int'
for c in f.comments:
subcalls.append('/*{} */'.format(c))
if f.is_padding():
subcalls.append('fromwire_pad(&cursor, &plen, {});'
.format(f.num_elems))
elif f.is_array():
self.print_fromwire_array('ctx', subcalls, basetype, f, f.name,
f.num_elems)
elif f.is_tlv:
if not f.is_variable_size():
raise TypeError('TLV {} not variable size'.format(f.name))
subcalls.append('struct {tlv_name} *_tlv = fromwire__{tlv_name}(ctx, &cursor, &plen, &{tlv_len});'
.format(tlv_name=f.name, tlv_len=f.lenvar))
subcalls.append('if (!_tlv)')
subcalls.append('return false;')
subcalls.append('*{tlv_name} = *_tlv;'.format(tlv_name=f.name))
elif f.is_variable_size():
subcalls.append("//2nd case {name}".format(name=f.name))
typename = f.fieldtype.name
# If structs are varlen, need array of ptrs to them.
if basetype in varlen_structs:
typename += ' *'
subcalls.append('*{} = {} ? tal_arr(ctx, {}, {}) : NULL;'
.format(f.name, f.lenvar, typename, f.lenvar))
# Allocate these off the array itself, if they need alloc.
self.print_fromwire_array('*' + f.name, subcalls, basetype, f,
'*' + f.name, f.lenvar)
else:
if f.optional:
assignable = f.fieldtype.is_assignable()
deref = '*'
else:
deref = ''
assignable = f.is_assignable()
if assignable:
if f.is_len_var:
s = '{} = fromwire_{}(&cursor, &plen);'.format(f.name, basetype)
else:
s = '{}*{} = fromwire_{}(&cursor, &plen);'.format(deref, f.name, basetype)
elif basetype in varlen_structs:
s = '{}*{} = fromwire_{}(ctx, &cursor, &plen);'.format(deref, f.name, basetype)
else:
s = 'fromwire_{}(&cursor, &plen, {}{});'.format(basetype, deref, f.name)
if f.optional:
subcalls.append("if (!fromwire_bool(&cursor, &plen))\n"
"*{} = NULL;\n"
"else {{\n"
"*{} = tal(ctx, {});\n"
"{}\n"
"}}"
.format(f.name, f.name, f.fieldtype.name,
s))
else:
subcalls.append(s)
return template.format(
name=self.name,
ctx=ctx_arg,
args=''.join(args),
fields=''.join(fields),
enum=self.enum,
subcalls=str(subcalls)
)
def print_towire_array(self, subcalls, basetype, f, num_elems, is_tlv=False):
p_ref = '' if is_tlv else '&'
msg_name = self.name + '->' if is_tlv else ''
if f.has_array_helper():
subcalls.append('towire_{}_array({}p, {}{}, {});'
.format(basetype, p_ref, msg_name, f.name, num_elems))
else:
subcalls.append('for (size_t i = 0; i < {}; i++)'
.format(num_elems))
if f.fieldtype.is_assignable() or basetype in varlen_structs:
subcalls.append('towire_{}({}p, {}{}[i]);'
.format(basetype, p_ref, msg_name, f.name))
else:
subcalls.append('towire_{}({}p, {}{} + i);'
.format(basetype, p_ref, msg_name, f.name))
def find_tlv_lenvar_field(self, tlv_name):
return [f for f in self.fields if f.is_len_var and f.lenvar_for.is_tlv and f.lenvar_for.name == tlv_name][0]
def print_towire(self, is_header):
template = towire_header_templ if is_header else towire_impl_templ
args = []
for f in self.fields:
if f.is_padding() or f.is_len_var:
continue
if f.is_array():
args.append(', const {} {}[{}]'.format(f.fieldtype.name, f.name, f.num_elems))
elif f.is_tlv:
args.append(', const struct {} *{}'.format(f.name, f.name))
elif f.is_assignable():
args.append(', {} {}'.format(f.fieldtype.name, f.name))
elif f.is_variable_size() and f.fieldtype.base() in varlen_structs:
args.append(', const {} **{}'.format(f.fieldtype.name, f.name))
else:
args.append(', const {} *{}'.format(f.fieldtype.name, f.name))
field_decls = []
for f in self.fields:
if f.is_len_var:
if f.lenvar_for.is_tlv:
# used below...
field_decls.append('\t{0} {1};'.format(f.fieldtype.base(), f.name))
else:
field_decls.append('\t{0} {1} = tal_count({2});'.format(
f.fieldtype.name, f.name, f.lenvar_for.name
))
subcalls = CCode()
for f in self.fields:
basetype = f.fieldtype.base()
for c in f.comments:
subcalls.append('/*{} */'.format(c))
if f.is_padding():
subcalls.append('towire_pad(&p, {});'
.format(f.num_elems))
elif f.is_array():
self.print_towire_array(subcalls, basetype, f, f.num_elems)
elif f.is_len_var and f.lenvar_for.is_tlv:
continue # taken care of below
elif f.is_tlv:
if not f.is_variable_size():
raise ValueError('TLV {} not variable size'.format(f.name))
lenvar_field = self.find_tlv_lenvar_field(f.name)
subcalls.append('/* ~~build TLV for {} ~~*/'.format(f.name))
subcalls.append("u8 *{tlv_name}_buffer = tal_arr(ctx, u8, 0);\n"
"towire__{tlv_name}(ctx, &{tlv_name}_buffer, {tlv_name});\n"
"{lenvar_field} = tal_count({tlv_name}_buffer);\n"
"towire_{lenvar_fieldtype}(&p, {lenvar_field});\n"
"towire_u8_array(&p, {tlv_name}_buffer, {lenvar_field});\n".format(
tlv_name=f.name,
lenvar_field=lenvar_field.name,
lenvar_fieldtype=lenvar_field.fieldtype.name))
elif f.is_variable_size():
self.print_towire_array(subcalls, basetype, f, f.lenvar)
else:
if f.optional:
if f.fieldtype.is_assignable():
deref = '*'
else:
deref = ''
subcalls.append("if (!{})\n"
"towire_bool(&p, false);\n"
"else {{\n"
"towire_bool(&p, true);\n"
"towire_{}(&p, {}{});\n"
"}}".format(f.name, basetype, deref, f.name))
else:
subcalls.append('towire_{}(&p, {});'
.format(basetype, f.name))
return template.format(
name=self.name,
args=''.join(args),
enumname=self.enum.name,
field_decls='\n'.join(field_decls),
subcalls=str(subcalls),
)
def add_truncate_check(self, subcalls, ref):
# Report if truncated, otherwise print.
call = 'if (!{}cursor) {{\nprintf("**TRUNCATED**\\n");\nreturn;\n}}'.format(ref)
subcalls.append(call)
def print_printwire_array(self, subcalls, basetype, f, num_elems, ref):
truncate_check_ref = '' if ref else '*'
if f.has_array_helper():
subcalls.append('printwire_{}_array(tal_fmt(NULL, "%s.{}", fieldname), {}cursor, {}plen, {});'
.format(basetype, f.name, ref, ref, num_elems))
else:
subcalls.append('printf("[");')
subcalls.append('for (size_t i = 0; i < {}; i++) {{'
.format(num_elems))
subcalls.append('{} v;'.format(f.fieldtype.name))
if f.fieldtype.is_assignable():
subcalls.append('v = fromwire_{}({}cursor, {}plen);'
.format(f.fieldtype.name, basetype, ref, ref))
else:
# We don't handle this yet!
assert(basetype not in varlen_structs)
subcalls.append('fromwire_{}({}cursor, {}plen, &v);'
.format(basetype, ref, ref))
self.add_truncate_check(subcalls, truncate_check_ref)
subcalls.append('printwire_{}(tal_fmt(NULL, "%s.{}", fieldname), &v);'
.format(basetype, f.name))
subcalls.append('}')
subcalls.append('printf("]");')
def print_printwire(self, is_header, is_embedded=False):
template = printwire_header_templ if is_header else printwire_impl_templ
fields = ['\t{} {};\n'.format(f.fieldtype.name, f.name) for f in self.fields if f.is_len_var]
tlv_args = '' if not is_embedded else ', size_t *plen'
ref = '&' if not is_embedded else ''
truncate_check_ref = '' if not is_embedded else '*'
toplevel_msg_setup = ''
if not is_embedded:
toplevel_msg_setup = printwire_toplevel_tmpl.format(enum=self.enum)
subcalls = CCode()
for f in self.fields:
basetype = f.fieldtype.base()
for c in f.comments:
subcalls.append('/*{} */'.format(c))
if f.is_len_var:
if f.fieldtype.is_var_int():
subcalls.append('{} {} = fromwire_{}({}cursor, {}plen);'
.format(basetype, f.name, 'var_int', ref, ref))
else:
subcalls.append('{} {} = fromwire_{}({}cursor, {}plen);'
.format(f.fieldtype.name, f.name, basetype, ref, ref))
self.add_truncate_check(subcalls, truncate_check_ref)
continue
subcalls.append('printf("{}=");'.format(f.name))
if f.is_padding():
subcalls.append('printwire_pad(tal_fmt(NULL, "%s.{}", fieldname), {}cursor, {}plen, {});'
.format(f.name, ref, ref, f.num_elems))
self.add_truncate_check(subcalls, truncate_check_ref)
elif f.is_array():
self.print_printwire_array(subcalls, basetype, f, f.num_elems, ref)
self.add_truncate_check(subcalls, truncate_check_ref)
elif f.fieldtype.is_subtype():
Subtype._inner_print_printwire_array(subcalls, basetype, f, f.lenvar, ref)
elif f.is_variable_size():
self.print_printwire_array(subcalls, basetype, f, f.lenvar, ref)
self.add_truncate_check(subcalls, truncate_check_ref)
else:
if f.optional:
subcalls.append("if (fromwire_bool({}cursor, {}plen)) {".format(ref, ref))
if f.is_assignable():
subcalls.append('{} {} = fromwire_{}({}cursor, {}plen);'
.format(f.fieldtype.name, f.name, basetype, ref, ref))
else:
# Don't handle these yet.
assert(basetype not in varlen_structs)
subcalls.append('{} {};'.
format(f.fieldtype.name, f.name))
subcalls.append('fromwire_{}({}cursor, {}plen, &{});'
.format(basetype, ref, ref, f.name))
self.add_truncate_check(subcalls, truncate_check_ref)
subcalls.append('printwire_{}(tal_fmt(NULL, "%s.{}", fieldname), &{});'
.format(basetype, f.name, f.name))
if f.optional:
subcalls.append("} else {")
self.add_truncate_check(subcalls, truncate_check_ref)
subcalls.append("}")
len_check = '' if is_embedded else printwire_lencheck
return template.format(
tlv_args=tlv_args,
name=self.name,
fields=''.join(fields),
toplevel_msg_setup=toplevel_msg_setup,
subcalls=str(subcalls),
lencheck=len_check,
cursor_ptr=('' if not is_embedded else '*'),
is_internal=('' if not is_embedded else 'static ')
)
class TlvMessage(Message):
def __init__(self, name, enum, comments):
super().__init__(name, enum, comments, is_tlv=True)
def print_struct(self):
return TlvMessage._inner_print_struct('tlv_msg_' + self.name, self.fields)
@staticmethod
def _inner_print_struct(struct_name, fields):
""" returns a string representation of this message as
a struct"""
fmt_fields = CCode()
for f in fields:
if f.is_len_var or f.is_padding():
# there is no ethical padding under structs
continue
elif f.is_variable_size():
fmt_fields.append('{} *{};'.format(f.fieldtype.name, f.name))
elif f.is_array():
fmt_fields.append('{} {}[{}];'.format(f.fieldtype.name, f.name, f.num_elems))
else:
fmt_fields.append('{} {};'.format(f.fieldtype.name, f.name))
return """
struct {struct_name} {{
{fields}
}};
""".format(
struct_name=struct_name,
fields=str(fmt_fields))
def print_towire(self, is_header, tlv_name):
""" prints towire function definition for a TLV message."""
if is_header:
return ''
field_decls = []
for f in self.fields:
if f.is_tlv:
raise TypeError("Nested TLVs aren't allowed!! {}->{}".format(tlv_name, f.name))
elif f.optional:
raise TypeError("Optional fields on TLV messages not currently supported. {}->{}".format(tlv_name, f.name))
if f.is_len_var:
field_decls.append('\t{0} {1} = tal_count({2}->{3});'.format(
f.fieldtype.name, f.name, self.name, f.lenvar_for.name
))
subcalls = CCode()
for f in self.fields:
basetype = f.fieldtype.base()
for c in f.comments:
subcalls.append('/*{} */'.format(c))
if f.is_padding():
subcalls.append('towire_pad(p, {});'.format(f.num_elems))
elif f.is_array():
self.print_towire_array(subcalls, basetype, f, f.num_elems,
is_tlv=True)
elif f.is_variable_size():
self.print_towire_array(subcalls, basetype, f, f.lenvar,
is_tlv=True)
elif f.is_len_var:
subcalls.append('towire_{}(p, {});'.format(basetype, f.name))
else:
subcalls.append('towire_{}(p, {}->{});'.format(basetype, self.name, f.name))
return tlv_message_towire_stub.format(
tlv_name=tlv_name,
name=self.name,
field_decls='\n'.join(field_decls),
subcalls=str(subcalls))
def print_fromwire(self, is_header, tlv_name):
""" prints fromwire function definition for a TLV message.
these are significantly different in that they take in a struct
to populate, instead of fields, as well as a length to read in
"""
if is_header:
return ''
ctx_arg = 'const tal_t *ctx, ' if self.has_variable_fields else ''
args = 'const u8 **cursor, size_t *plen, const u16 len, struct tlv_msg_{name} *{name}'.format(name=self.name)
fields = ['\t{} {};\n'.format(f.fieldtype.name, f.name) for f in self.fields if f.is_len_var]
subcalls = CCode()
for f in self.fields:
basetype = f.fieldtype.base()
if f.is_tlv:
raise TypeError('Nested TLVs arent allowed!!')
elif f.optional:
raise TypeError('Optional fields on TLV messages not currently supported')
for c in f.comments:
subcalls.append('/*{} */'.format(c))
if f.is_padding():
subcalls.append('fromwire_pad(cursor, plen, {});'
.format(f.num_elems))
elif f.is_array():
name = '*{}->{}'.format(self.name, f.name)
self.print_fromwire_array('ctx', subcalls, basetype, f, name,
f.num_elems, is_embedded=True)
elif f.is_variable_size():
subcalls.append("// 2nd case {name}".format(name=f.name))
typename = f.fieldtype.name
# If structs are varlen, need array of ptrs to them.
if basetype in varlen_structs:
typename += ' *'
subcalls.append('{}->{} = {} ? tal_arr(ctx, {}, {}) : NULL;'
.format(self.name, f.name, f.lenvar, typename, f.lenvar))
name = '{}->{}'.format(self.name, f.name)
# Allocate these off the array itself, if they need alloc.
self.print_fromwire_array('*' + f.name, subcalls, basetype, f,
name, f.lenvar, is_embedded=True)
else:
if f.is_assignable():
if f.is_len_var:
s = '{} = fromwire_{}(cursor, plen);'.format(f.name, basetype)
else:
s = '{}->{} = fromwire_{}(cursor, plen);'.format(
self.name, f.name, basetype)
else:
s = 'fromwire_{}(cursor, plen, &{}->{});'.format(
basetype, self.name, f.name)
subcalls.append(s)
return fromwire_tlv_impl_templ.format(
tlv_name=tlv_name,
name=self.name,
ctx=ctx_arg,
args=''.join(args),
fields=''.join(fields),
subcalls=str(subcalls)
)
class Subtype(Message):
def __init__(self, name, comments):
super().__init__(name, None, comments, False)
def print_struct(self):
return TlvMessage._inner_print_struct(self.name, self.fields)
def print_towire(self):
""" prints towire function definition for a subtype"""
template = subtype_towire_header_stub if options.header else subtype_towire_stub
field_decls = []
for f in self.fields:
if f.optional:
raise TypeError("Optional fields on subtypes not currently supported. {}".format(f.name))
if f.is_len_var:
field_decls.append('\t{0} {1} = tal_count({2}->{3});'.format(
f.fieldtype.name, f.name, self.name, f.lenvar_for.name
))
subcalls = CCode()
for f in self.fields:
basetype = f.fieldtype.base()
for c in f.comments:
subcalls.append('/*{} */'.format(c))
if f.is_padding():
subcalls.append('towire_pad(p, {});'.format(f.num_elems))
elif f.is_array():
self.print_towire_array(subcalls, basetype, f, f.num_elems,
is_tlv=True)
elif f.is_variable_size():
self.print_towire_array(subcalls, basetype, f, f.lenvar,
is_tlv=True)
elif f.is_len_var:
subcalls.append('towire_{}(p, {});'.format(basetype, f.name))
else:
ref = '&' if f.fieldtype.needs_ptr() else ''
subcalls.append('towire_{}(p, {}{}->{});'.format(basetype, ref, self.name, f.name))
return template.format(
static='' if options.subtypes else 'static ',
name=self.name,
field_decls='\n'.join(field_decls),
subcalls=str(subcalls))
def print_fromwire(self):
""" prints fromwire function definition for a subtype.
these are significantly different in that they take in a struct
to populate, instead of fields.
"""
ctx_arg = 'const tal_t *ctx, ' if self.has_variable_fields else ''
args = 'const u8 **cursor, size_t *plen, struct {name} *{name}'.format(name=self.name)
fields = ['\t{} {};\n'.format(f.fieldtype.name, f.name) for f in self.fields if f.is_len_var]
template = fromwire_subtype_header_templ if options.header else fromwire_subtype_impl_templ
subcalls = CCode()
for f in self.fields:
basetype = f.fieldtype.base()
if f.optional:
raise TypeError('Optional fields on subtypes not currently supported')
for c in f.comments:
subcalls.append('/*{} */'.format(c))
if f.is_padding():
subcalls.append('fromwire_pad(cursor, plen, {});'
.format(f.num_elems))
elif f.is_array():
name = '*{}->{}'.format(self.name, f.name)
self.print_fromwire_array('ctx', subcalls, basetype, f, name,
f.num_elems, is_embedded=True)
elif f.is_variable_size():
subcalls.append("// 2nd case {name}".format(name=f.name))
typename = f.fieldtype.name
# If structs are varlen, need array of ptrs to them.
if basetype in varlen_structs:
typename += ' *'
subcalls.append('{}->{} = {} ? tal_arr(ctx, {}, {}) : NULL;'
.format(self.name, f.name, f.lenvar, typename, f.lenvar))
name = '{}->{}'.format(self.name, f.name)
# Allocate these off the array itself, if they need alloc.
self.print_fromwire_array(name, subcalls, basetype, f,
name, f.lenvar, is_embedded=True)
else:
if f.is_assignable():
if f.is_len_var:
s = '{} = fromwire_{}(cursor, plen);'.format(f.name, basetype)
else:
s = '{}->{} = fromwire_{}(cursor, plen);'.format(
self.name, f.name, basetype)
else:
ref = '&' if f.fieldtype.needs_ptr() else ''
s = 'fromwire_{}(cursor, plen, {}{}->{});'.format(
basetype, ref, self.name, f.name)
subcalls.append(s)
return template.format(
static='' if options.subtypes else 'static ',
name=self.name,
ctx=ctx_arg,
args=''.join(args),
fields=''.join(fields),
subcalls=str(subcalls)
)
def print_printwire_array(self, subcalls, basetype, f, num_elems, ref):
return Subtype._inner_print_printwire_array(subcalls, basetype, f, num_elems, '')
@staticmethod
def _inner_print_printwire_array(subcalls, basetype, f, num_elems, ref):
if f.has_array_helper():
subcalls.append('printwire_{}_array(tal_fmt(NULL, "%s.{}", fieldname), {}cursor, {}plen, {});'
.format(basetype, f.name, ref, ref, num_elems))
else:
subcalls.append('printf("[");')
subcalls.append('for (size_t i = 0; i < {}; i++) {{'
.format(num_elems))
subcalls.append('printwire_{}(tal_fmt(NULL, "%s.{}", fieldname), {}cursor, {}plen);'
.format(basetype, f.name, ref, ref))
subcalls.append('}')
subcalls.append('printf("]");')
tlv_message_towire_stub = """static void towire_{tlv_name}_{name}(u8 **p, struct tlv_msg_{name} *{name}) {{
{field_decls}
{subcalls}
}}
"""
subtype_towire_stub = """{static}void towire_{name}(u8 **p, const struct {name} *{name}) {{
{field_decls}
{subcalls}
}}
"""
subtype_towire_header_stub = """void towire_{name}(u8 **p, const struct {name} *{name});"""
tlv_struct_template = """
struct {tlv_name} {{
{msg_type_structs}
}};
"""
tlv__type_impl_towire_fields = """\tif ({tlv_name}->{name}) {{
\t\ttlv_msg = tal_arr(ctx, u8, 0);
\t\ttowire_u8(p, {enum});
\t\ttowire_{tlv_name}_{name}(&tlv_msg, {tlv_name}->{name});
\t\tmsg_len = tal_count(tlv_msg);
\t\ttowire_var_int(p, msg_len);
\t\ttowire_u8_array(p, tlv_msg, msg_len);
\t\ttal_free(tlv_msg);
\t}}
"""
tlv__type_impl_towire_template = """static void towire__{tlv_name}(const tal_t *ctx, u8 **p, const struct {tlv_name} *{tlv_name}) {{
\tu64 msg_len;
\tu8 *tlv_msg;
{fields}}}
"""
tlv__type_impl_fromwire_template = """static struct {tlv_name} *fromwire__{tlv_name}(const tal_t *ctx, const u8 **p, size_t *plen, const u64 *len) {{
\tu8 msg_type;
\tu64 msg_len;
\tsize_t start_len = *plen;
\tif (*plen < *len)
\t\treturn NULL;
\tstruct {tlv_name} *{tlv_name} = talz(ctx, struct {tlv_name});
\twhile (*plen) {{
\t\tmsg_type = fromwire_u8(p, plen);
\t\tmsg_len = fromwire_var_int(p, plen);
\t\tif (*plen < msg_len) {{
\t\t\tfromwire_fail(p, plen);
\t\t\tbreak;
\t\t}}
\t\tswitch((enum {tlv_name}_type)msg_type) {{
{cases}\t\tdefault:
\t\t\tif (msg_type % 2 == 0) {{ // it's ok to be odd
\t\t\t\tfromwire_fail(p, plen);
\t\t\t\ttal_free({tlv_name});
\t\t\t\treturn NULL;
\t\t\t}}
\t\t\t*p += msg_len;
\t\t\t*plen -= msg_len;
\t\t}}
\t}}
\tif (!*p || start_len - *plen != *len) {{
\t\ttal_free({tlv_name});
\t\treturn NULL;
\t}}
\treturn {tlv_name};
}}
"""
case_tmpl = """\t\tcase {tlv_msg_enum}:
\t\t\tif ({tlv_name}->{tlv_msg_name} != NULL) {{
\t\t\t\tfromwire_fail(p, plen);
\t\t\t\ttal_free({tlv_name});
\t\t\t\treturn NULL;
\t\t\t}}
\t\t\t{tlv_name}->{tlv_msg_name} = tal({tlv_name}, struct tlv_msg_{tlv_msg_name});
\t\t\tif (!fromwire_{tlv_name}_{tlv_msg_name}({ctx_arg}p, plen, msg_len, {tlv_name}->{tlv_msg_name})) {{
\t\t\t\ttal_free({tlv_name});
\t\t\t\treturn NULL;
\t\t\t}}
\t\t\tbreak;
"""
print_tlv_template = """static void printwire_{tlv_name}(const char *fieldname, const u8 *cursor)
{{
\tu8 msg_type;
\tu64 msg_size;
\tsize_t plen = tal_count(cursor);
\twhile (cursor) {{
\t\tmsg_type = fromwire_u8(&cursor, &plen);
\t\tmsg_size = fromwire_var_int(&cursor, &plen);
\t\tif (!cursor)
\t\t\tbreak;
\t\tswitch ((enum {tlv_name}_type)msg_type) {{
\t\t\t{printcases}
\t\t\tdefault:
\t\t\t\tprintf("WARNING:No message matching type %d\\n", msg_type);
\t\t}}
\t}}
\tif (plen != 0)
\t\tprintf("EXTRA: %s\\n", tal_hexstr(NULL, cursor, plen));
}}
"""
def build_tlv_fromwires(tlv_fields):
fromwires = []
for field_name, messages in tlv_fields.items():
fromwires.append(print_tlv_fromwire(field_name, messages))
return fromwires
def build_tlv_towires(tlv_fields):
towires = []
for field_name, messages in tlv_fields.items():
towires.append(print_tlv_towire(field_name, messages))
return towires
def print_tlv_towire(tlv_field_name, messages):
fields = ""
for m in messages:
fields += tlv__type_impl_towire_fields.format(
tlv_name=tlv_field_name,
enum=m.enum.name,
name=m.name)
return tlv__type_impl_towire_template.format(
tlv_name=tlv_field_name,
fields=fields)
def print_tlv_fromwire(tlv_field_name, messages):
cases = ""
for m in messages:
ctx_arg = tlv_field_name + ', ' if m.has_variable_fields else ''
cases += case_tmpl.format(ctx_arg=ctx_arg,
tlv_msg_enum=m.enum.name,
tlv_name=tlv_field_name,
tlv_msg_name=m.name)
return tlv__type_impl_fromwire_template.format(
tlv_name=tlv_field_name,
cases=cases)
def build_tlv_type_struct(name, messages):
inner_structs = CCode()
for m in messages:
inner_structs.append('struct tlv_msg_{} *{};'.format(m.name, m.name))
return tlv_struct_template.format(
tlv_name=name,
msg_type_structs=str(inner_structs))
def build_tlv_type_structs(tlv_fields):
structs = ''
for name, messages in tlv_fields.items():
structs += build_tlv_type_struct(name, messages)
return structs
def find_message(messages, name):
for m in messages:
if m.name == name:
return m
return None
def print_tlv_printwire(tlv_name, messages):
printcases = ''
for m in messages:
printcases += 'case {enum.name}: printf("{enum.name} (size %"PRIu64"):\\n", msg_size); printwire_{name}("{name}", &cursor, &plen); break;'.format(
enum=m.enum, name=m.name, tlv_name=tlv_name)
return print_tlv_template.format(
tlv_name=tlv_name,
printcases=printcases)
def print_tlv_printwires(enumname, tlv_fields):
decls = []
switches = ''
for name, messages in tlv_fields.items():
# Print each of the message parsers
decls += [m.print_printwire(options.header, is_embedded=True) for m in messages]
# Print the TLV body parser
decls.append(print_tlv_printwire(name, messages))
# Print the 'master' print_tlv_messages cases
switches += tlv_switch_template.format(tlv_name=name)
decls.append(print_master_tlv_template.format(enumname=enumname, tlv_switches=switches))
return decls
def find_message_with_option(messages, optional_messages, name, option):
fullname = name + "_" + option.replace('-', '_')
base = find_message(messages, name)
if not base:
raise ValueError('Unknown message {}'.format(name))
m = find_message(optional_messages, fullname)
if not m:
# Add a new option.
m = copy.deepcopy(base)
m.name = fullname
optional_messages.append(m)
return m
parser = argparse.ArgumentParser(description='Generate C from CSV')
parser.add_argument('--header', action='store_true', help="Create wire header")
parser.add_argument('--subtypes', action='store_true', help="Include subtype parsing function delcarations in header definition. Only active if --header also declared.")
parser.add_argument('--bolt', action='store_true', help="Generate wire-format for BOLT")
parser.add_argument('--printwire', action='store_true', help="Create print routines")
parser.add_argument('headerfilename', help='The filename of the header')
parser.add_argument('enumname', help='The name of the enum to produce')
parser.add_argument('files', nargs='*', help='Files to read in (or stdin)')
options = parser.parse_args()
# Maps message names to messages
messages = []
messages_with_option = []
subtypes = []
comments = []
includes = []
tlv_fields = {}
prevfield = None
# Read csv lines. Single comma is the message values, more is offset/len.
for line in fileinput.input(options.files):
# #include gets inserted into header
if line.startswith('#include '):
includes.append(line)
continue
by_comments = line.rstrip().split('#')
# Emit a comment if they included one
if by_comments[1:]:
comments.append(' '.join(by_comments[1:]))
parts = by_comments[0].split(',')
if parts == ['']:
continue
if len(parts) in [1, 2, 3]:
# eg: commit_sig,132,(_tlv)
is_tlv_msg = len(parts) == 3
if len(parts) == 1: # this is a subtype, it has no type number.
subtypes.append(Subtype(parts[0], comments))
else:
if is_tlv_msg:
message = TlvMessage(parts[0],
Enumtype("WIRE_" + parts[0].upper(), parts[1]),
comments)
else:
message = Message(parts[0],
Enumtype("WIRE_" + parts[0].upper(), parts[1]),
comments)
messages.append(message)
if is_tlv_msg:
tlv_fields[parts[2]].append(message)
comments = []
prevfield = None
else:
if len(parts) == 4:
# eg commit_sig,0,channel-id,8 OR
# commit_sig,0,channel-id,u64
m = find_message(messages + subtypes, parts[0])
elif len(parts) == 5:
# eg.
# channel_reestablish,48,your_last_per_commitment_secret,32,option209
m = find_message_with_option(messages, messages_with_option, parts[0], parts[4])
else:
raise ValueError('Line {} malformed'.format(line.rstrip()))
if m is None:
raise ValueError('Unknown message or subtype {}'.format(parts[0]))
f = Field(m.name, parts[2], parts[3], comments, prevfield, includes)
m.addField(f)
# If it used prevfield as lenvar, keep that for next
# time (multiple fields can use the same lenvar).
if not f.lenvar:
prevfield = parts[2]
comments = []
def construct_hdr_enums(msgs):
enums = ""
for m in msgs:
for c in m.comments:
enums += '\t/*{} */\n'.format(c)
enums += '\t{} = {},\n'.format(m.enum.name, m.enum.value)
return enums
def construct_impl_enums(msgs):
return '\n\t'.join(['case {enum.name}: return "{enum.name}";'.format(enum=m.enum) for m in msgs])
def enum_header(enums, enumname):
return format_enums(enum_header_template, enums, enumname)
def enum_impl(enums, enumname):
return format_enums(enum_impl_template, enums, enumname)
def format_enums(template, enums, enumname):
return template.format(
enums=enums,
enumname=enumname)
def build_hdr_enums(toplevel_enumname, toplevel_messages, tlv_fields):
enum_set = ""
if len(toplevel_messages):
enum_set += enum_header(construct_hdr_enums(toplevel_messages), toplevel_enumname)
for field_name, tlv_messages in tlv_fields.items():
enum_set += "\n"
enum_set += enum_header(construct_hdr_enums(tlv_messages), field_name + '_type')
return enum_set
def build_impl_enums(toplevel_enumname, toplevel_messages, tlv_fields):
enum_set = ""
if len(toplevel_messages):
enum_set += enum_impl(construct_impl_enums(toplevel_messages), toplevel_enumname)
for field_name, tlv_messages in tlv_fields.items():
enum_set += "\n"
enum_set += enum_impl(construct_impl_enums(tlv_messages), field_name + '_type')
return enum_set
def build_tlv_structs(tlv_fields):
structs = ""
for field_name, tlv_messages in tlv_fields.items():
for m in tlv_messages:
structs += m.print_struct()
return structs
def build_subtype_structs(subtypes):
structs = ""
for subtype in subtypes:
structs += subtype.print_struct()
return structs
enum_header_template = """enum {enumname} {{
{enums}
}};
const char *{enumname}_name(int e);
"""
enum_impl_template = """
const char *{enumname}_name(int e)
{{
\tstatic char invalidbuf[sizeof("INVALID ") + STR_MAX_CHARS(e)];
\tswitch ((enum {enumname})e) {{
\t{enums}
\t}}
\tsnprintf(invalidbuf, sizeof(invalidbuf), "INVALID %i", e);
\treturn invalidbuf;
}}
"""
header_template = """/* This file was generated by generate-wire.py */
/* Do not modify this file! Modify the _csv file it was generated from. */
#ifndef LIGHTNING_{idem}
#define LIGHTNING_{idem}
#include <ccan/tal/tal.h>
#include <wire/wire.h>
{includes}
{formatted_hdr_enums}{gen_structs}
{func_decls}
#endif /* LIGHTNING_{idem} */
"""
impl_template = """/* This file was generated by generate-wire.py */
/* Do not modify this file! Modify the _csv file it was generated from. */
#include <{headerfilename}>
#include <ccan/mem/mem.h>
#include <ccan/tal/str/str.h>
#include <stdio.h>
{formatted_impl_enums}
{func_decls}
"""
print_tlv_message_printwire_empty = """void print{enumname}_tlv_message(const char *tlv_name, const u8 *msg)
{{
\tprintf("~~ No TLV definition found for %s ~~\\n", tlv_name);
}}
"""
print_header_template = """/* This file was generated by generate-wire.py */
/* Do not modify this file! Modify the _csv file it was generated from. */
#ifndef LIGHTNING_{idem}
#define LIGHTNING_{idem}
#include <ccan/tal/tal.h>
#include <devtools/print_wire.h>
{includes}
void print{enumname}_message(const u8 *msg);
void print{enumname}_tlv_message(const char *tlv_name, const u8 *msg);
{func_decls}
#endif /* LIGHTNING_{idem} */
"""
print_template = """/* This file was generated by generate-wire.py */
/* Do not modify this file! Modify the _csv file it was generated from. */
#include "{headerfilename}"
#include <ccan/mem/mem.h>
#include <ccan/tal/str/str.h>
#include <common/utils.h>
#include <inttypes.h>
#include <stdio.h>
void print{enumname}_message(const u8 *msg)
{{
\tswitch ((enum {enumname})fromwire_peektype(msg)) {{
\t{printcases}
\t}}
\tprintf("UNKNOWN: %s\\n", tal_hex(msg, msg));
}}
{func_decls}
"""
print_master_tlv_template = """
void print{enumname}_tlv_message(const char *tlv_name, const u8 *msg)
{{
\t{tlv_switches}
\tprintf("ERR: Unknown TLV message type: %s\\n", tlv_name);
}}
"""
tlv_switch_template = """
\tif (strcmp(tlv_name, "{tlv_name}") == 0) {{
\t\tprintwire_{tlv_name}("{tlv_name}", msg);
\t\treturn;
\t}}
"""
idem = re.sub(r'[^A-Z]+', '_', options.headerfilename.upper())
if options.printwire:
if options.header:
template = print_header_template
else:
template = print_template
elif options.header:
template = header_template
else:
template = impl_template
# Print out all the things
toplevel_messages = [m for m in messages if not m.is_tlv]
built_hdr_enums = build_hdr_enums(options.enumname, toplevel_messages, tlv_fields)
built_impl_enums = build_impl_enums(options.enumname, toplevel_messages, tlv_fields)
tlv_structs = build_tlv_structs(tlv_fields)
tlv_structs += build_tlv_type_structs(tlv_fields)
subtype_structs = build_subtype_structs(subtypes)
includes = '\n'.join(includes)
printcases = ['case {enum.name}: printf("{enum.name}:\\n"); printwire_{name}("{name}", msg); return;'.format(enum=m.enum, name=m.name) for m in toplevel_messages]
if options.printwire:
decls = []
if not options.header:
subtype_decls = [m.print_printwire(options.header, is_embedded=True) for m in subtypes]
subtype_decls.reverse()
decls += subtype_decls
if len(tlv_fields):
decls += print_tlv_printwires(options.enumname, tlv_fields)
else:
decls += [print_tlv_message_printwire_empty.format(enumname=options.enumname)]
decls += [m.print_printwire(options.header) for m in toplevel_messages + messages_with_option]
else:
towire_decls = []
fromwire_decls = []
for tlv_field, tlv_messages in tlv_fields.items():
for m in tlv_messages:
towire_decls.append(m.print_towire(options.header, tlv_field))
fromwire_decls.append(m.print_fromwire(options.header, tlv_field))
if not options.header:
towire_decls += build_tlv_towires(tlv_fields)
fromwire_decls += build_tlv_fromwires(tlv_fields)
if not options.header or (options.header and options.subtypes):
subtype_towires = []
subtype_fromwires = []
for subtype in subtypes:
subtype_towires.append(subtype.print_towire())
subtype_fromwires.append(subtype.print_fromwire())
subtype_towires.reverse()
subtype_fromwires.reverse()
towire_decls += subtype_towires
fromwire_decls += subtype_fromwires
towire_decls += [m.print_towire(options.header) for m in toplevel_messages + messages_with_option]
fromwire_decls += [m.print_fromwire(options.header) for m in toplevel_messages + messages_with_option]
decls = fromwire_decls + towire_decls
print(template.format(
headerfilename=options.headerfilename,
printcases='\n\t'.join(printcases),
idem=idem,
includes=includes,
enumname=options.enumname,
formatted_hdr_enums=built_hdr_enums,
formatted_impl_enums=built_impl_enums,
gen_structs=tlv_structs + subtype_structs,
func_decls='\n'.join(decls)))