C++ runtime: add eRPC server, minimal CLI and Makefile. WIP.
#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
# See COPYING.Runtime file for copyrights details.
#
from ctypes import *
from datetime import timedelta as td
class IEC_STRING(Structure):
"""
Must be changed according to changes in iec_types.h
"""
_fields_ = [("len", c_uint8),
("body", c_char * 126)]
class IEC_TIME(Structure):
"""
Must be changed according to changes in iec_types.h
"""
_fields_ = [("s", c_long), # tv_sec
("ns", c_long)] # tv_nsec
def _t(t, u=lambda x: x.value, p=lambda t, x: t(x)):
return (t, u, p)
def _ttime():
return (IEC_TIME,
lambda x: td(0, x.s, x.ns/1000.0),
lambda t, x: t(x.days * 24 * 3600 + x.seconds, x.microseconds*1000))
SameEndianessTypeTranslator = {
"BOOL": _t(c_uint8, lambda x: bool(x.value)),
"STEP": _t(c_uint8),
"TRANSITION": _t(c_uint8),
"ACTION": _t(c_uint8),
"SINT": _t(c_int8),
"USINT": _t(c_uint8),
"BYTE": _t(c_uint8),
"STRING": (IEC_STRING,
lambda x: x.body[:x.len].decode(),
lambda t, x: t(len(x), x.encode() if type(x)==str else x)),
"INT": _t(c_int16),
"UINT": _t(c_uint16),
"WORD": _t(c_uint16),
"DINT": _t(c_int32),
"UDINT": _t(c_uint32),
"DWORD": _t(c_uint32),
"LINT": _t(c_int64),
"ULINT": _t(c_uint64),
"LWORD": _t(c_uint64),
"REAL": _t(c_float),
"LREAL": _t(c_double),
"TIME": _ttime(),
"TOD": _ttime(),
"DATE": _ttime(),
"DT": _ttime(),
}
SwapedEndianessTypeTranslator = {
# TODO
}
TypeTranslator = SameEndianessTypeTranslator
# Construct debugger natively supported types
DebugTypesSize = dict([(key, sizeof(t)) for key, (t, p, u) in SameEndianessTypeTranslator.items() if t is not None])
def UnpackDebugBuffer(buff, indexes):
res = []
buffoffset = 0
buffsize = len(buff)
buffptr = cast(cast(buff, c_char_p), c_void_p).value
for iectype in indexes:
c_type, unpack_func, _pack_func = TypeTranslator.get(iectype,
(None, None, None))
cursor = c_void_p(buffptr + buffoffset)
if iectype == "STRING":
# strlen is stored in c_uint8 and sizeof(c_uint8) is 1
# first check we can read size
if (buffoffset + 1) <= buffsize:
size = 1 + cast(cursor,POINTER(c_type)).contents.len
else:
return None
else:
size = sizeof(c_type)
if c_type is not None and (buffoffset + size) <= buffsize:
ptr = cast(cursor, POINTER(c_type))
value = unpack_func(ptr.contents)
buffoffset += size
res.append(value)
else:
return None
if buffoffset and buffoffset == buffsize:
return res
return None
def ValueToIECBytes(iectype, value):
if value is None:
return None
c_type, _unpack_func, pack_func = TypeTranslator[iectype]
return bytes(pack_func(c_type, value))