runtime/typemapping.py
author Edouard Tisserant
Tue, 08 Nov 2022 11:02:35 +0100
changeset 3662 364f2409eeda
parent 3395 93ad018fb602
child 3750 f62625418bff
permissions -rw-r--r--
SVGHMI: watchdog now calls OnStart and OnStop commands just after calling OnWatchdog. Therefore, OnWatchdog command should not restart browser by itself.
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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#
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# See COPYING.Runtime file for copyrights details.
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#
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from __future__ import absolute_import
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import ctypes
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from ctypes import *
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from datetime import timedelta as td
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ctypes.pythonapi.PyString_AsString.argtypes = (ctypes.c_void_p,)
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ctypes.pythonapi.PyString_AsString.restype = ctypes.POINTER(ctypes.c_char)
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class IEC_STRING(Structure):
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    """
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    Must be changed according to changes in iec_types.h
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    """
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    _fields_ = [("len", c_uint8),
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                ("body", c_char * 126)]
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class IEC_TIME(Structure):
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    """
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    Must be changed according to changes in iec_types.h
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    """
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    _fields_ = [("s", c_long),   # tv_sec
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                ("ns", c_long)]  # tv_nsec
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def _t(t, u=lambda x: x.value, p=lambda t, x: t(x)):
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    return (t, u, p)
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def _ttime():
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    return (IEC_TIME,
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            lambda x: td(0, x.s, x.ns/1000.0),
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            lambda t, x: t(x.days * 24 * 3600 + x.seconds, x.microseconds*1000))
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SameEndianessTypeTranslator = {
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    "BOOL":       _t(c_uint8, lambda x: x.value != 0),
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    "STEP":       _t(c_uint8),
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    "TRANSITION": _t(c_uint8),
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    "ACTION":     _t(c_uint8),
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    "SINT":       _t(c_int8),
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    "USINT":      _t(c_uint8),
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    "BYTE":       _t(c_uint8),
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    "STRING":     (IEC_STRING,
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                   lambda x: x.body[:x.len],
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                   lambda t, x: t(len(x), x)),
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    "INT":        _t(c_int16),
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    "UINT":       _t(c_uint16),
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    "WORD":       _t(c_uint16),
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    "DINT":       _t(c_int32),
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    "UDINT":      _t(c_uint32),
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    "DWORD":      _t(c_uint32),
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    "LINT":       _t(c_int64),
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    "ULINT":      _t(c_uint64),
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    "LWORD":      _t(c_uint64),
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    "REAL":       _t(c_float),
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    "LREAL":      _t(c_double),
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    "TIME":       _ttime(),
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    "TOD":        _ttime(),
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    "DATE":       _ttime(),
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    "DT":         _ttime(),
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    }
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SwapedEndianessTypeTranslator = {
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    # TODO
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    }
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TypeTranslator = SameEndianessTypeTranslator
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# Construct debugger natively supported types
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DebugTypesSize = dict([(key, sizeof(t)) for key, (t, p, u) in SameEndianessTypeTranslator.iteritems() if t is not None])
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def UnpackDebugBuffer(buff, indexes):
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    res = []
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    buffoffset = 0
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    buffsize = len(buff)
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    buffptr = cast(ctypes.pythonapi.PyString_AsString(id(buff)), c_void_p).value
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    for iectype in indexes:
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        c_type, unpack_func, _pack_func = \
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            TypeTranslator.get(iectype, (None, None, None))
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        cursor = c_void_p(buffptr + buffoffset)
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        if iectype == "STRING":
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            # strlen is stored in c_uint8 and sizeof(c_uint8) is 1
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            # first check we can read size
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            if (buffoffset + 1) <= buffsize:
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                size = 1 + cast(cursor,POINTER(c_type)).contents.len
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            else:
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                return None
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        else:
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            size = sizeof(c_type)
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        if c_type is not None and (buffoffset + size) <= buffsize:
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            value = unpack_func(cast(cursor,
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                                     POINTER(c_type)).contents)
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            buffoffset += size
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            res.append(value)
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        else:
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            return None
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    if buffoffset and buffoffset == buffsize:
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        return res
8078c01ae464 Now Debug Buffer Unpacking is a separate function, declared in typemapping.py
Edouard Tisserant
parents: 972
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   109
    return None