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#!/usr/bin/env python
# -*- coding: utf-8 -*-

"""
    OpenGEODE - A tiny SDL Editor for TASTE

    This module generates Ada code from SDL process models.
    The Ada code is compliant with the TASTE interfaces, and is
    using the ASN.1 "Space-Certified" compiler for data type definition.
    (See TASTE documentation for more information)

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    The design is flexible and can be used as basis for other backends.
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    Entry point:
    The AST of the model that is parsed is described in ogAST.py

    A Visitor Pattern using Python's "singledispatch" mechanism is used
    to go through the AST and generate code for each SDL construct.

    There is a single function called "generate", decorated with the
    singledispatch mechanism, that needs to be called to generate the code
    of any AST element.

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    The generate function returns two values: "code" and "local_decl",
    containing a set of statements and a set of local variables
    (that can be later placed anywhere in the code).
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    Expressions (all classes derived from ogAST.Expression) are generated
    using the "expression" visitor (singledispatch set of function).

    Expressions return three values: "code", "ada_string" and "local_decl".
    The "ada_string" value is the usable string that corresponds
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    to the result of the expression evaluation.

    For example, take the SDL statement "OUTPUT hello(a+5)"

    This results (in TASTE terminology) in calling the required interface
    called "hello" and passing a parameter of an ASN.1 type (say MyInteger).
    The parameter is always passed by reference.

    It is therefore necessary to build a temporary variable to hold the result
    of the "a+5" expression.

    In this example, the "generate" function will return:
    local_decl = ["tmp01 : MyInteger;"]
    (The template backend can then place it wherever appropriate)

    and code = ["tmp01 := a + 5;", "hello(tmp01);"]
    (The template will then do a '\n'.join(code) - and add indents, etc.)

    To know about "tmp01" and generate the code "hello(tmp01);",
    the function will recursively call "generate" and
    pass a+5 as parameter. The call will return the tuple:

    local_decl = ["tmp01 : MyInteger;"]
    code = ["tmp01 := a + 5;"]
    ada_string = "tmp01"

    This design allows to have any level of complexity in the embedded
    expression in a way that is easy to handle (adding constructs with
    this pattern is straightforward, once the generate function for each AST
    entry is properly implemented).

    Copyright (c) 2012-2013 European Space Agency

    Designed and implemented by Maxime Perrotin

    Contact: maxime.perrotin@esa.int
"""


import logging
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import traceback
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import os
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import stat
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from itertools import chain, product
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from singledispatch import singledispatch

import ogAST
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import Helper
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LOG = logging.getLogger(__name__)

__all__ = ['generate']

# reference to the ASN.1 Data view and to the visible variables (in scope)
TYPES = None
VARIABLES = {}
LOCAL_VAR = {}
# List of output signals and procedures
OUT_SIGNALS = []
PROCEDURES = []

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# Specify that the target is a shared library
SHARED_LIB = False

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UNICODE_SEP = u'\u00dc'
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LPREFIX = u'ctxt'
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@singledispatch
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def generate(*args, **kwargs):
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    ''' Generate the code for an item of the AST '''
    raise TypeError('[AdaGenerator] Unsupported AST construct')
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    return [], []
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# Processing of the AST
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@generate.register(ogAST.Process)
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def _process(process, simu=False, **kwargs):
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    ''' Generate the code for a complete process (AST Top level) '''
    process_name = process.processName
    global TYPES
    TYPES = process.dataview
    del OUT_SIGNALS[:]
    del PROCEDURES[:]
    OUT_SIGNALS.extend(process.output_signals)
    PROCEDURES.extend(process.procedures)
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    global SHARED_LIB
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    global LPREFIX
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    if simu:
        SHARED_LIB = True
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        LPREFIX = process_name + u'_ctxt'
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    # taste-properties module-specific flag for the Ada backend:
    # import the state data from an external module
    import_context = kwargs["ppty_check"] if "ppty_check" in kwargs else ""

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    # When building a shared library (with simu=True), generate a "mini-cv"
    # for aadl2glueC to create the code interfacing with asn1scc
    minicv = ['-- Automatically generated by OpenGEODE - do NOT modify!']
    def aadl_template(sp_name, io_param, pi_or_ri):
        ''' AADL mini-cv code in case of shared library
            sp_name  : name of the PI or RI
            io_param : list of (param_name, type_name, direction)
            pi_or_ri : string "PI" or "RI" depending on the direction
            return a string
        '''
        res = []
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        if not io_param:
            LOG.info('Parameterless interface "{}" will not appear in the'
                     ' AADL file but will be handled directly by the GUI'
                     .format(sp_name))
            return ''
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        # In case of shared library, generate the AADL "mini-cv" code
        res.append('SUBPROGRAM {}'.format(sp_name))
        if io_param:
            res.append('FEATURES')
            for param_name, sort, direction in io_param:
                res.append('    {pname}: {io} PARAMETER DataView::{sort} '
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                          '{{encoding=>Native;}};'.format(pname=param_name,
                                                          sort=sort,
                                                          io=direction))
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        res.append('END {};\n'.format(sp_name))
        res.append('SUBPROGRAM IMPLEMENTATION {}.GUI_{}'
                      .format(sp_name, pi_or_ri))
        res.append('PROPERTIES')
        res.append('    FV_Name => "{}";'.format(process_name))
        res.append('    Source_Language => GUI_{};'.format(pi_or_ri))
        res.append('END {}.GUI_{};\n'.format(sp_name, pi_or_ri))
        return '\n'.join(res)

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    # bash script to simulate the system (TEMPORARY)
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    # go up to the root of the AST to get the list of ASN.1 files
    parent = process.parent
    while hasattr(parent, 'parent') and parent.parent:
        parent = parent.parent
    if isinstance(parent, ogAST.System):
        parent = parent.ast
    asn1_filenames = ' '.join(parent.asn1_filenames)
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    asn1_uniq = ' '.join(each for each in parent.asn1_filenames
                         if each != 'dataview-uniq.asn')
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    pr_path = ' '.join(parent.pr_files) if None not in parent.pr_files else ''
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    pr_names = ' '.join(
                      os.path.basename(pr_file) for pr_file in parent.pr_files)
    asn1_modules = (name.lower().replace('-', '_') + '.o'
                    for name in process.asn1Modules)

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    simu_script = '''#!/bin/bash -e
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rm -rf {pr}_simu
mkdir -p {pr}_simu
cp {pr_path} {asn1} {pr}_simu
cd {pr}_simu
opengeode {pr_names} --shared
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cat {uniq} >> dataview-uniq.asn '''.format(pr=process_name.lower(),
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                                           asn1=asn1_filenames,
                                           pr_path=pr_path,
                                           uniq=asn1_uniq or '/dev/null',
                                           pr_names=pr_names)
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    if asn1_filenames:
        simu_script += '''
asn1.exe -Ada -typePrefix asn1Scc -equal {asn1}
asn1.exe -c -typePrefix asn1Scc -equal {asn1}'''.format(asn1=asn1_filenames)

    simu_script += '''
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gnatmake -gnat2012 -c *.adb
gnatbind -n -Llib{pr} {pr}
gnatmake -c -gnat2012 b~{pr}.adb
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gcc -shared -fPIC -o lib{pr}.so b~{pr}.o {pr}.o {asn1_mod} adaasn1rtl.o -lgnat
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rm -f dataview-uniq.c dataview-uniq.h
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asn2aadlPlus dataview-uniq.asn DataView.aadl
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aadl2glueC DataView.aadl {pr}_interface.aadl
asn2dataModel -toPython dataview-uniq.asn
make -f Makefile.python
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echo "errCodes=$(taste-asn1-errCodes ./dataview-uniq.h)" >>datamodel.py
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LD_LIBRARY_PATH=. opengeode-simulator
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'''.format(pr=process_name.lower(),
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           asn1_files=asn1_filenames,
           asn1_mod=' '.join(asn1_modules))
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    LOG.info('Generating Ada code for process ' + str(process_name))

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    # In case model has nested states, flatten everything
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    Helper.flatten(process, sep=UNICODE_SEP)
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    # Process State aggregations (Parallel states) XXX Add to C backend
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    # Find recursively in the AST all state aggregations
    # Format: {'aggregation_name' : [list of ogAST.CompositeState]
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    aggregates = Helper.state_aggregations(process)
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    # Extract the list of parallel states names inside the composite states
    # of state aggregations XXX add to C generator
    parallel_states = Helper.parallel_states(aggregates)
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    # Make an maping {input: {state: transition...}} in order to easily
    # generate the lookup tables for the state machine runtime
    mapping = Helper.map_input_state(process)

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    VARIABLES.update(process.variables)

    process_level_decl = []
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    # Establish the list of states (excluding START states) XXX update C backend
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    full_statelist = set(chain(aggregates.viewkeys(),
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                               (name for name in process.mapping.iterkeys()
                                    if not name.endswith(u'START'))))
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    reduced_statelist = {s for s in full_statelist if s not in parallel_states}
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    if aggregates:
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        # Parallel states in a state aggregation may terminate
        full_statelist.add(u'{}finished'.format(UNICODE_SEP))
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    context_decl = []
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    if full_statelist:
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        context_decl.append(u'type States is ({});'
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                            .format(u', '.join(full_statelist) or u'No_State'))
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    # Generate the code to declare process-level context
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    context_decl.extend(['type {}_Ty is'.format(LPREFIX), 'record'])
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    if full_statelist:
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        context_decl.append('state : States;')
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    context_decl.append('initDone : Boolean := False;')
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    # State aggregation: add list of substates (XXX to be added in C generator)
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    for substates in aggregates.viewvalues():
        for each in substates:
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            context_decl.append(u'{}{}state: States;'
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                                      .format(each.statename, UNICODE_SEP))
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    for var_name, (var_type, def_value) in process.variables.viewitems():
        if def_value:
            # Expression must be a ground expression, i.e. must not
            # require temporary variable to store computed result
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            dst, dstr, dlocal = expression(def_value)
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            varbty = find_basic_type(var_type)
            if varbty.kind in ('SequenceOfType', 'OctetStringType'):
                dstr = array_content(def_value, dstr, varbty)
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            assert not dst and not dlocal, 'DCL: Expecting a ground expression'
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        context_decl.append(
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                        u'{n} : aliased {sort}{default};'
                        .format(n=var_name,
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                                sort=type_name(var_type),
                                default=u' := ' + dstr if def_value else u''))
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    context_decl.append('end record;')
    context_decl.append('{ctxt}: {ctxt}_Ty;'.format(ctxt=LPREFIX))
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    if simu:
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        # Export the context, so that it can be manipulated from outside
        # (in practice used by the "properties" module.
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        context_decl.append(u'pragma export (C, {ctxt}, "{ctxt}");'
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                                  .format(ctxt=LPREFIX))
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        # Exhaustive simulation needs a backup of the context to quickly undo
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        context_decl.append(u'{ctxt}_bk: {ctxt}_Ty;'
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                                  .format(ctxt=LPREFIX))
    elif import_context:
        # Possibility to have the context defined outside the module
        # in order for a model checker to view/modify internals without any
        # copy at runtime
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        context_decl.append(u'pragma import (C, ctxt, "{}_ctxt");'
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                                  .format(import_context))
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    if not simu:
        process_level_decl.extend(context_decl)

    # Continuous State transition id
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    process_level_decl.append('CS_Only  : constant Integer := {};'
                              .format(len(process.transitions)))
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    for name, val in process.mapping.viewitems():
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        # Test val, in principle there is a value but if the code targets
        # generation of properties, the model may have been cleant up and
        # in that case no value would be set..
        if name.endswith(u'START') and name != u'START' and val:
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            process_level_decl.append(u'{name} : constant := {val};'
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                                      .format(name=name, val=str(val)))

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    # Declare start procedure for aggregate states XXX add in C generator
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    # should create one START per "via" clause, TODO later
    aggreg_start_proc = []
    for name, substates in aggregates.viewitems():
        proc_name = u'procedure {}{}START'.format(name, UNICODE_SEP)
        process_level_decl.append(u'{};'.format(proc_name))
        aggreg_start_proc.extend([u'{} is'.format(proc_name),
                                  'begin'])
        aggreg_start_proc.extend(u'runTransition({sub}{sep}START);'
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                                 .format(sub=subname.statename,
                                         sep=UNICODE_SEP)
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                                 for subname in substates)
        aggreg_start_proc.extend([u'end {}{}START;'
                                 .format(name, UNICODE_SEP),
                                 '\n'])
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    # Add the declaration of the runTransition procedure
    process_level_decl.append('procedure runTransition(Id: Integer);')
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    # Generate the code of the start transition (if process not empty)
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    initDone =  u'{ctxt}.initDone := True;'.format(ctxt=LPREFIX)
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    if not simu:
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        start_transition = [u'begin']
        if process.transitions:
            start_transition.append(u'runTransition(0);')
        start_transition.append(initDone)
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    else:
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        start_transition = [u'procedure Startup is',
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                            u'begin',
                            u'   runTransition(0);' if process.transitions
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                                                   else 'null;',
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                            initDone,
                            u'end Startup;']
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    # Generate the TASTE template
    try:
        asn1_modules = '\n'.join(['with {dv};\nuse {dv};'.format(
            dv=dv.replace('-', '_'))
            for dv in process.asn1Modules])
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        if process.asn1Modules:
            asn1_modules += '\nwith adaasn1rtl;\nuse adaasn1rtl;'
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    except TypeError:
        asn1_modules = '--  No ASN.1 data types are used in this model'
    taste_template = ['''\
-- This file was generated automatically: DO NOT MODIFY IT !

with System.IO;
use System.IO;

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with Ada.Unchecked_Conversion;
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with Ada.Numerics.Generic_Elementary_Functions;
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{dataview}

with Interfaces;
use Interfaces;
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{C}
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package body {process_name} is'''.format(process_name=process_name,
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                                         dataview=asn1_modules,
                                         C='with Interfaces.C.Strings;\n'
                                           'use Interfaces.C.Strings;'
                                            if simu else '')]
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    # Generate the source file (.ads) header
    ads_template = ['''\
-- This file was generated automatically: DO NOT MODIFY IT !

{dataview}
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{C}
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package {process_name} is'''.format(process_name=process_name,
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                                    dataview=asn1_modules,
                                    C='with Interfaces.C.Strings;\n'
                                      'use Interfaces.C.Strings;'
                                        if simu else '')]
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    dll_api = []
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    if simu:
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        ads_template.extend(context_decl)
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        ads_template.append('--  API for simulation via DLL')
        dll_api.append('-- API to remotely change internal data')
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        # Add function allowing to trace current state as a string
        process_level_decl.append("function get_state return chars_ptr "
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                                  "is (New_String(states'Image({ctxt}.state)))"
                                  " with Export, Convention => C, "
                                  'Link_Name => "{name}_state";'
                                  .format(name=process_name, ctxt=LPREFIX))
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        set_state_decl = "procedure set_state(new_state: chars_ptr)"
        ads_template.append("{};".format(set_state_decl))
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        ads_template.append('pragma Export(C, set_state, "_set_state");')
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        dll_api.append("{} is".format(set_state_decl))
        dll_api.append("begin")
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        dll_api.append("{}.state := States'Value(Value(new_state));"
                       .format(LPREFIX))
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        dll_api.append("end set_state;")
        dll_api.append("")

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        # Save/restore state allow one step undo, as needed for model checking
        save_state_decl = "procedure save_context"
        restore_state_decl = "procedure restore_context"
        ads_template.append("{};".format(save_state_decl))
        ads_template.append('pragma Export(C, save_context, "_save_context");')
        ads_template.append("{};".format(restore_state_decl))
        ads_template.append('pragma Export(C, restore_context, "_restore_context");')
        dll_api.append("{} is".format(save_state_decl))
        dll_api.append("begin")
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        dll_api.append("{ctxt}_bk := {ctxt};".format(ctxt=LPREFIX))
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        dll_api.append("end save_context;")
        dll_api.append("")
        dll_api.append("{} is".format(restore_state_decl))
        dll_api.append("begin")
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        dll_api.append("{ctxt} := {ctxt}_bk;".format(ctxt=LPREFIX))
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        dll_api.append("end restore_context;")
        dll_api.append("")

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        # Declare procedure Startup in .ads
        ads_template.append(u'procedure Startup;')
        ads_template.append(u'pragma Export(C, Startup, "{}_startup");'
                            .format(process_name))

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        # interface to get/set state aggregations XXX add to C generator
        for substates in aggregates.viewvalues():
            for each in substates:
                process_level_decl.append(
                        u"function get_{name}_state return chars_ptr "
                        u"is (New_String(states'Image({ctxt}.{name}{sep}state)"
                        ")) with Export, Convention => C, "
                        'Link_Name => "{proc}_{name}_state";'
                        .format(name=each.statename, ctxt=LPREFIX,
                                proc=process_name, sep=UNICODE_SEP))

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        # Functions to get gobal variables (length and value)
        for var_name, (var_type, _) in process.variables.viewitems():
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            # Getters for external applications to view local variables via dll
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            process_level_decl.append("function l_{name}_value"
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                                     " return access {sort} "
                                     "is ({prefix}.{name}'access) with Export,"
                                     " Convention => C,"
                                     ' Link_Name => "{name}_value";'
                                     .format(prefix=LPREFIX, name=var_name,
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                                              sort=type_name(var_type)))
            # Setters for local variables
            setter_decl = "procedure dll_set_l_{name}(value: access {sort})"\
                          .format(name=var_name, sort=type_name(var_type))
            ads_template.append('{};'.format(setter_decl))
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            ads_template.append('pragma Export(C, dll_set_l_{name},'
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                                ' "_set_{name}");'.format(name=var_name))
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            dll_api.append('{} is'.format(setter_decl))
            dll_api.append('begin')
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            dll_api.append('{}.{} := value.all;'.format(LPREFIX, var_name))
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            dll_api.append('end dll_set_l_{};'.format(var_name))
            dll_api.append('')

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    # Generate the the code of the procedures
    inner_procedures_code = []
    for proc in process.content.inner_procedures:
        proc_code, proc_local = generate(proc)
        process_level_decl.extend(proc_local)
        inner_procedures_code.extend(proc_code)
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        if proc.exported:
            # Exported procedures must be declared in the .ads
            pi_header = procedure_header(proc)
            ads_template.append(u'{};'.format(pi_header))
            if not proc.external:
                ads_template.append(u'pragma Export'
                                    u'(C, p{sep}{proc_name}, "_{proc_name}");'
                                    .format(sep=UNICODE_SEP,
                                            proc_name=proc.inputString))
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    # Generate the code for the process-level variable declarations
    taste_template.extend(process_level_decl)

    # Add the code of the procedures definitions
    taste_template.extend(inner_procedures_code)

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    # Generate the code of the START procedures of state aggregations
    # XXX to be added to C generator
    taste_template.extend(aggreg_start_proc)

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    # Add the code of the DLL interface
    taste_template.extend(dll_api)

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    # Generate the code for each input signal (provided interface) and timers
    for signal in process.input_signals + [
                        {'name': timer.lower()} for timer in process.timers]:
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        signame = signal.get('name', u'START')
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        if signame == u'START':
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            continue
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        pi_header = u'procedure {sig_name}'.format(sig_name=signame)
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        param_name = signal.get('param_name') \
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                                or u'{}_param'.format(signame)
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        # Add (optional) PI parameter (only one is possible in TASTE PI)
        if 'type' in signal:
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            typename = type_name(signal['type'])
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            pi_header += u'({pName}: access {sort})'.format(
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                                        pName=param_name, sort=typename)
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        # Add declaration of the provided interface in the .ads file
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        ads_template.append(u'--  Provided interface "{}"'.format(signame))
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        ads_template.append(pi_header + ';')
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        ads_template.append(u'pragma Export(C, {name}, "{proc}_{name}");'
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                             .format(name=signame, proc=process_name))
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        if simu:
            # Generate code for the mini-cv template
            params = [(param_name, type_name(signal['type'], use_prefix=False),
                      'IN')] if 'type' in signal else []
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            minicv.append(aadl_template(signame, params, 'RI'))
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        pi_header += ' is'
        taste_template.append(pi_header)
        taste_template.append('begin')
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        def execute_transition(state):
            ''' Generate the code that triggers the transition for the current
                state/input combination '''
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            input_def = mapping[signame].get(state)
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            # Check for nested states to call optional exit procedure
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            state_tree = state.split(UNICODE_SEP)
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            context = process
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            exitlist = []
            current = ''
            trans = input_def and process.transitions[input_def.transition_id]
            while state_tree:
                current = current + state_tree.pop(0)
                for comp in context.composite_states:
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                    if current.lower() == comp.statename.lower():
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                        if comp.exit_procedure:
                            exitlist.append(current)
                        context = comp
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                        current = current + UNICODE_SEP
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                        break
            for each in reversed(exitlist):
                if trans and all(each.startswith(trans_st)
                                 for trans_st in trans.possible_states):
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                    taste_template.append(u'p{sep}{ref}{sep}exit;'
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                                          .format(ref=each, sep=UNICODE_SEP))
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            if input_def:
                for inp in input_def.parameters:
                    # Assign the (optional and unique) parameter
                    # to the corresponding process variable
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                    taste_template.append(u'{ctxt}.{inp} := {tInp}.all;'
                                          .format(ctxt=LPREFIX,
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                                                  inp=inp,
                                                  tInp=param_name))
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                # Execute the correponding transition
                if input_def.transition:
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                    taste_template.append(u'runTransition({idx});'.format(
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                        idx=input_def.transition_id))
                else:
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                    taste_template.append('runTransition(CS_Only);')
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            else:
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                taste_template.append('runTransition(CS_Only);')
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        taste_template.append('case {}.state is'.format(LPREFIX))
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        def case_state(state):
            ''' Recursive function (in case of state aggregation) to generate
                the code that calls the proper transition according
                to the current state
                The input name is in signame
            '''
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            if state.endswith(u'START'):
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                return
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            taste_template.append(u'when {state} =>'.format(state=state))
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            input_def = mapping[signame].get(state)
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            if state in aggregates.viewkeys():
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                # State aggregation:
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                # - find which substate manages this input
                # - add a swich case on the corresponding substate
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                taste_template.append(u'-- this is a state aggregation')
                for sub in aggregates[state]:
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                    if [a for a in sub.mapping.viewkeys()
                            if a in mapping[signame].viewkeys()]:
                        taste_template.append(u'case '
                                              u'{ctxt}.{sub}{sep}state is'
                                              .format(ctxt=LPREFIX,
                                                     sub=sub.statename,
                                                     sep=UNICODE_SEP))
                        for par in sub.mapping.viewkeys():
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                            case_state(par)
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                        taste_template.append('when others =>')
                        taste_template.append('null;')
                        taste_template.append('end case;')
                        break
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                else:
                    # Input is not managed in the state aggregation
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                    if input_def:
                        # check if it is managed one level above
                        execute_transition(state)
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                    taste_template.append('null;')
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            else:
                execute_transition(state)
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        map(case_state, reduced_statelist) # XXX update C generator

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        taste_template.append('when others =>')
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        taste_template.append('runTransition(CS_Only);')
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        taste_template.append('end case;')
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        taste_template.append(u'end {};'.format(signame))
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        taste_template.append('\n')

    # for the .ads file, generate the declaration of the required interfaces
    # output signals are the asynchronous RI - only one parameter
    for signal in process.output_signals:
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        param_name = signal.get('param_name') \
                                or u'{}_param'.format(signal['name'])
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        # Add (optional) RI parameter
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        # Paramless TMs: when targetting simulation, the name of the TM is
        # passed as single parameter. This allows the simualor to handle them
        # dynamically, with a single callback function for all TMs
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        param_spec = '' if not simu else "(tm: chars_ptr)"
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        if 'type' in signal:
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            typename = type_name(signal['type'])
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            param_spec = u'({pName}: access {sort}{shared})' \
                         .format(pName=param_name,
                                 sort=typename,
                                 shared=u'; Size: Integer'
                                        if SHARED_LIB else '')
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        ads_template.append(u'--  {}equired interface "{}"'
                            .format("Paramless r" if not 'type' in signal
                                else "R", signal['name']))
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        if simu:
            # When generating a shared library, we need a callback mechanism
            ads_template.append(u'type {}_T is access procedure{};'
                                .format(signal['name'], param_spec))
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            ads_template.append(u'pragma Convention(Convention => C,'
                                u' Entity => {}_T);'.format(signal['name']))
            ads_template.append(u'RI{sep}{sig} : {sig}_T;'
                                .format(sep=UNICODE_SEP, sig=signal['name']))
            ads_template.append(u'procedure Register_{sig}(Callback: {sig}_T);'
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                                .format(sig=signal['name']))
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            ads_template.append(u'pragma Export(C, Register_{sig},'
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                                ' "register_{sig}");'
                                .format(sig=signal['name']))
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            # Generate code for the mini-cv template
            params = [(param_name, type_name(signal['type'], use_prefix=False),
                      'IN')] if 'type' in signal else []
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            minicv.append(aadl_template(signal['name'], params, 'PI'))
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            taste_template.append(u'procedure Register_{sig}'
                                  u'(Callback:{sig}_T) is'
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                                  .format(sig=signal['name']))
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            taste_template.append(u'begin')
            taste_template.append(u'RI{sep}{sig} := Callback;'
                                  .format(sep=UNICODE_SEP, sig=signal['name']))
            taste_template.append(u'end Register_{};'.format(signal['name']))
            taste_template.append(u'')
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        else:
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            ads_template.append(u'procedure RI{}{}{};'
                                .format(UNICODE_SEP,
                                        signal['name'],
                                        param_spec))
            ads_template.append(u'pragma import(C, RI{sep}{sig},'
                                u' "{proc}_RI_{sig}");'
                                .format(sep=UNICODE_SEP,
                                        sig=signal['name'],
                                        proc=process_name))
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    # for the .ads file, generate the declaration of the external procedures
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    for proc in (proc for proc in process.procedures if proc.external):
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        ri_header = u'procedure RI{sep}{sig_name}'.format(
                                                     sep=UNICODE_SEP,
                                                     sig_name=proc.inputString)
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        params = []
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        params_spec = u""
        if simu:
            # For simulators: add the TM name as first parameter
            params.append("tm: chars_ptr")
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        for param in proc.fpar:
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            typename = type_name(param['type'])
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            params.append(u'{par[name]}: access {sort}{shared}'
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                          .format(par=param,
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                                  sort=typename,
                                  shared=u"; {}_Size: Integer"
                                         .format(param['name'])
                                         if SHARED_LIB else ""))
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        if params:
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            params_spec = "({})".format("; ".join(params))
            ri_header += params_spec
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        ads_template.append(u'--  Sync required interface "{}"'
                            .format(proc.inputString))
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        if simu:
            # As for async TM, generate a callback mechanism
            ads_template.append(u"type {}_T is access procedure{};"
                                .format(proc.inputString, params_spec))
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            ads_template.append(u'pragma Convention(Convention => C,'
                                u' Entity => {}_T);'.format(proc.inputString))
            ads_template.append(u'RI{sep}{sig} : {sig}_T;'
                                .format(sep=UNICODE_SEP, sig=proc.inputString))
            ads_template.append(u'procedure Register_{sig}(Callback: {sig}_T);'
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                                .format(sig=proc.inputString))
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            ads_template.append(u'pragma Export(C, Register_{sig},'
                                u' "register_{sig}");'
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                                .format(sig=proc.inputString))
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            taste_template.append(u'procedure Register_{sig}'
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                                  '(Callback:{sig}_T) is'
                                  .format(sig=proc.inputString))
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            taste_template.append(u'begin')
            taste_template.append(u'RI{sep}{sig} := Callback;'
                                  .format(sep=UNICODE_SEP,
                                          sig=proc.inputString))
            taste_template.append(u'end Register_{};'.format(proc.inputString))
            taste_template.append(u'')
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        else:
            ads_template.append(ri_header + u';')
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            ads_template.append(u'pragma import(C, RI{sep}{sig},'
                                u' "{proc}_RI_{sig}");'
                                .format(sep=UNICODE_SEP,
                                        sig=proc.inputString,
                                        proc=process_name))
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    # for the .ads file, generate the declaration of timers set/reset functions
    for timer in process.timers:
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        ads_template.append(u'--  Timer {} SET and RESET functions'
                            .format(timer))
        if simu:
            # Declare callback registration for the SET and RESET functions
            ads_template.append(u'type SET_{}_T is access procedure'
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                                 '(name: chars_ptr; duration: Asn1Int);'
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                                .format(timer))
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            ads_template.append(u'type RESET_{}_T is access procedure'
                                '(name: chars_ptr);'.format(timer))
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            for each in ('', 'RE'):
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                ads_template.append(u'pragma Convention(Convention => C,'
                                    u' Entity => {re}SET_{t}_T);'
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                                    .format(re=each, t=timer))
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                ads_template.append(u'{re}SET_{t} : {re}SET_{t}_T;'
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                                    .format(re=each, t=timer))
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                ads_template.append(u'procedure Register_{re}SET_{t}'
                                    u'(Callback: {re}SET_{t}_T);'
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                                    .format(re=each, t=timer))
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                ads_template.append(u'pragma Export(C, Register_{re}SET_{t},'
                                    u' "register_{re}SET_{t}");'
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                                    .format(re=each, t=timer))
            # Code for the SET/RESET timer callback registration
            for each in ('', 'RE'):
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                taste_template.append(u'procedure Register_{re}SET_{t}'
                                      u'(Callback:{re}SET_{t}_T) is'
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                                      .format(re=each, t=timer))
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                taste_template.append(u'begin')
                taste_template.append(u'{re}SET_{t} := Callback;'
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                                      .format(re=each, t=timer))
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                taste_template.append(u'end Register_{re}SET_{t};'
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                                      .format(re=each, t=timer))
                taste_template.append('')

        else:
            ads_template.append(u'procedure SET_{}(val: access asn1SccT_UInt32);'
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                .format(timer))
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            ads_template.append(
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                u'pragma import(C, SET_{timer}, "{proc}_RI_set_{timer}");'
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                .format(timer=timer, proc=process_name))
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            ads_template.append(u'procedure RESET_{};'.format(timer))
            ads_template.append(
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                u'pragma import(C, RESET_{timer}, "{proc}_RI_reset_{timer}");'
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                .format(timer=timer, proc=process_name))

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    if simu and process.cs_mapping:
        # Callback registration for Check_Queue
        taste_template.append(u'procedure Register_Check_Queue'
                              u'(Callback: Check_Queue_T) is')
        taste_template.append(u'begin')
        taste_template.append(u'Check_Queue := Callback;')
        taste_template.append(u'end Register_Check_Queue;')
        taste_template.append(u'')

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    # If the process has no input, output, procedures, or timers, then Ada
    # will not compile the body - generate a pragma to fix this
    if not process.timers and not process.procedures \
            and not process.input_signals and not process.output_signals:
        ads_template.append('pragma elaborate_body;')

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    # Transform inner labels to floating labels
    Helper.inner_labels_to_floating(process)
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    # Generate the code for all transitions
    code_transitions = []
    local_decl_transitions = []
    for proc_tr in process.transitions:
        code_tr, tr_local_decl = generate(proc_tr)
        code_transitions.append(code_tr)
        local_decl_transitions.extend(tr_local_decl)

    # Generate code for the floating labels
    code_labels = []
    for label in process.content.floating_labels:
        code_label, label_decl = generate(label)
        local_decl_transitions.extend(label_decl)
        code_labels.extend(code_label)

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    # Generate the code of the runTransition procedure, if needed
    if process.transitions:
        taste_template.append('procedure runTransition(Id: Integer) is')
        taste_template.append('trId : Integer := Id;')
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        if process.cs_mapping:
            taste_template.append(
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                              'msgPending : aliased Asn1Boolean := True;')
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        # Declare the local variables needed by the transitions in the template
        taste_template.extend(set(local_decl_transitions))
        taste_template.append('begin')
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        # Generate a loop that ends when a next state is reached
        # (there can be chained transition when entering a nested state)
        taste_template.append('while (trId /= -1) loop')
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        # Generate the switch-case on the transition id
        taste_template.append('case trId is')
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        for idx, val in enumerate(code_transitions):
            taste_template.append(u'when {idx} =>'.format(idx=idx))
            val = [u'{line}'.format(line=l) for l in val]
            if val:
                taste_template.extend(val)
            else:
                taste_template.append('null;')
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        taste_template.append('when CS_Only =>')
        taste_template.append('trId := -1;')
        taste_template.append('goto next_transition;')

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        taste_template.append('when others =>')
        taste_template.append('null;')

        taste_template.append('end case;')
        if code_labels:
            # Due to nested states (chained transitions) jump over label code
            # (NEXTSTATEs do not return from runTransition)
            taste_template.append('goto next_transition;')
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        # Add the code for the floating labels
        taste_template.extend(code_labels)
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        taste_template.append('<<next_transition>>')
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        # After completing active transition(s), check continuous signals:
        #     - Check current state(s)
        #     - For each continuous signal generate code (test+transition)
        # XXX add to C backend
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        if process.cs_mapping and not simu:
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            taste_template.append('--  Process continuous signals')
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            taste_template.append('if {}.initDone then'.format(LPREFIX))
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            taste_template.append("Check_Queue(msgPending'access);")
            taste_template.append('end if;')
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            ads_template.append(
                    u'procedure Check_Queue(res: access Asn1Boolean);')
            ads_template.append(
                u'pragma import(C, Check_Queue, "{proc}_check_queue");'
                .format(proc=process_name))
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        elif process.cs_mapping and simu:
            taste_template.append('if {}.initDone then'.format(LPREFIX))
            taste_template.append("Check_Queue(msgPending'access);")
            taste_template.append('end if;')
            # simulation: create a callback registration function
            ads_template.append(u'type Check_Queue_T is access procedure'
                                u'(res: access Asn1Boolean);')
            ads_template.append(u'pragma Convention(Convention => C,'
                                u' Entity => Check_Queue_T);')
            ads_template.append(u'Check_Queue : Check_Queue_T;')
            ads_template.append(u'procedure Register_Check_Queue'
                                u'(Callback: Check_Queue_T);')
            ads_template.append(u'pragma Export(C, Register_Check_Queue,'
                                ' "register_check_queue");')
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        else:
            taste_template.append('null;')

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        # Process the continuous signals in state aggregations first
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        done = []
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        sep = 'if '
        last = ''
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        # flag indicating there are CS in nested states but not at root
        need_final_endif = False
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        for cs, agg in product(process.cs_mapping.viewitems(),
                               aggregates.viewitems()):
            (statename, cs_item), (agg_name, substates) = cs, agg
            for each in substates:
                if statename in each.mapping.viewkeys():
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                    need_final_endif = True
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                    taste_template.append(u'{first}if not msgPending and '
                            u'trId = -1 and '
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                            u'{ctxt}.state = {s1} and '
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                            u'{ctxt}.{s2}{unisep}state = {s3} then'
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                            .format(ctxt=LPREFIX, s1=agg_name,
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                                s2=each.statename, unisep=UNICODE_SEP,
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                                s3=statename, first='els' if done else ''))
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                    # Change priority 0 (no priority set) to lowest priority
                    lowest_priority = max(item.priority for item in cs_item)
                    for each in cs_item:
                        if each.priority == 0:
                            each.priority = lowest_priority + 1
                    for provided_clause in sorted(cs_item,
                                                 key=lambda itm: itm.priority):
                        taste_template.append(u'-- Priority {}'
                                             .format(provided_clause.priority))
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                        trId = process.transitions.index\
                                            (provided_clause.transition)
                        code, loc = generate(provided_clause.trigger,
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                                             branch_to=trId,
                                             sep=sep, last=last)
                        sep='elsif '
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                        taste_template.extend(code)
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                    done.append(statename)
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                    taste_template.append(u'end if;')  # inner if
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                    sep = 'if '
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                    break
        for statename in process.cs_mapping.viewkeys() - done:
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            need_final_endif = False
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            cs_item = process.cs_mapping[statename]
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            taste_template.append(u'{first}if not msgPending and '
                    u'trId = -1 and {}.state = {} then'
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                    .format(LPREFIX, statename, first='els' if done else ''))
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            # Change priority 0 (no priority set) to lowest priority
            lowest_priority = max(item.priority for item in cs_item)
            for each in cs_item:
                if each.priority == 0:
                    each.priority = lowest_priority + 1
            for provided_clause in sorted(cs_item,
                                          key=lambda itm: itm.priority):
                taste_template.append(u'-- Priority {}'
                                      .format(provided_clause.priority))
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                trId = process.transitions.index(provided_clause.transition)
                code, loc = generate(provided_clause.trigger,
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                                     branch_to=trId, sep=sep, last=last)
                sep='elsif '
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                taste_template.extend(code)
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            taste_template.append(u'end if;') # inner if
            taste_template.append(u'end if;') # current state
            sep = 'if '
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        if need_final_endif:
            taste_template.append(u'end if;')

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        taste_template.append('end loop;')
        taste_template.append('end runTransition;')
        taste_template.append('\n')
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    else:
        # No transitions defined, but keep the interface for CS_Only calls
        taste_template.append('procedure runTransition(Id: Integer) is')
        taste_template.append('begin')
        taste_template.append('null;')
        taste_template.append('end runTransition;')
        taste_template.append('\n')
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    # Add code of the package elaboration
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    taste_template.extend(start_transition)
    taste_template.append('end {process_name};'
            .format(process_name=process_name))

    ads_template.append('end {process_name};'
            .format(process_name=process_name))

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    with open(process_name.lower() + os.extsep + 'adb', 'w') as ada_file:
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        ada_file.write(
                u'\n'.join(format_ada_code(taste_template)).encode('latin1'))
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    with open(process_name.lower() + os.extsep + 'ads', 'w') as ada_file:
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        ada_file.write(
                u'\n'.join(format_ada_code(ads_template)).encode('latin1'))
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    if simu:
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        with open(u'{}_interface.aadl'
                  .format(process_name.lower()), 'w') as aadl:
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            aadl.write(u'\n'.join(minicv).encode('latin1'))
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