Type_chk.cc 269 KB
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/******************************************************************************
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 * Copyright (c) 2000-2018 Ericsson Telecom AB
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 * All rights reserved. This program and the accompanying materials
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 * are made available under the terms of the Eclipse Public License v2.0
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 * which accompanies this distribution, and is available at
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 * https://www.eclipse.org/org/documents/epl-2.0/EPL-2.0.html
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 *
 * Contributors:
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 *   Baji, Laszlo
 *   Balasko, Jeno
 *   Baranyi, Botond
 *   Beres, Szabolcs
 *   Bibo, Zoltan
 *   Cserveni, Akos
 *   Delic, Adam
 *   Dimitrov, Peter
 *   Feher, Csaba
 *   Forstner, Matyas
 *   Gecse, Roland
 *   Kovacs, Ferenc
 *   Nagy, Lenard
 *   Raduly, Csaba
 *   Szabados, Kristof
 *   Szabo, Janos Zoltan – initial implementation
 *   Szabo, Bence Janos
 *   Szalai, Gabor
 *   Tatarka, Gabor
 *   Zalanyi, Balazs Andor
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 *
 ******************************************************************************/
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#include "../common/dbgnew.hh"
#include "Type.hh"
#include "Typestuff.hh" // FIXME CTs
#include "CompField.hh"
#include "CompType.hh"
#include "TypeCompat.hh"
#include "EnumItem.hh"
#include "SigParam.hh"

#include "Valuestuff.hh"
#include "main.hh"

#include "ttcn3/Ttcnstuff.hh"
#include "ttcn3/TtcnTemplate.hh"
#include "ttcn3/Templatestuff.hh"
#include "ttcn3/Attributes.hh"
#include "ttcn3/ArrayDimensions.hh"
#include "ttcn3/PatternString.hh"

#include "asn1/Tag.hh"
#include "XerAttributes.hh"
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#include "ttcn3/RawAST.hh"
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#include "ttcn3/JsonAST.hh"
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#include <ctype.h>
#include <stdlib.h> // for qsort
#include <string.h>

extern int rawAST_debug;

namespace Common {

using Ttcn::MultiWithAttrib;
using Ttcn::SingleWithAttrib;
using Ttcn::WithAttribPath;
using Ttcn::Qualifier;
using Ttcn::Qualifiers;

void Type::chk()
{
  if(w_attrib_path) w_attrib_path->chk_global_attrib();
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  if (legacy_codec_handling) {
    parse_attributes();
  }
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  if(!tags_checked) {
    tags_checked = true;
    if(tags) tags->chk();
  }
  if (checked) return;
  switch(typetype) {
  case T_ERROR:
  case T_NULL:
  case T_BOOL:
  case T_INT:
  case T_REAL:
  case T_BSTR:
  case T_HSTR:
  case T_OSTR:
  case T_CSTR:
  case T_USTR:
  case T_UTF8STRING:
  case T_NUMERICSTRING:
  case T_PRINTABLESTRING:
  case T_TELETEXSTRING:
  case T_VIDEOTEXSTRING:
  case T_IA5STRING:
  case T_GRAPHICSTRING:
  case T_VISIBLESTRING:
  case T_GENERALSTRING:
  case T_UNIVERSALSTRING:
  case T_BMPSTRING:
  case T_UTCTIME:
  case T_GENERALIZEDTIME:
  case T_OBJECTDESCRIPTOR:
  case T_OID:
  case T_ROID:
  case T_ANY:
  case T_EXTERNAL:
  case T_EMBEDDED_PDV:
  case T_UNRESTRICTEDSTRING:
  case T_VERDICT:
  case T_DEFAULT:
    break;
  case T_INT_A:
    chk_Int_A();
    break;
  case T_ENUM_A:
    chk_Enum_A();
    break;
  case T_ENUM_T:
    chk_Enum_T();
    break;
  case T_BSTR_A:
    chk_BStr_A();
    break;
  case T_OPENTYPE:
    chk_SeCho_T();
    break;
  case T_ANYTYPE:
    // TODO maybe check for address type and add it automagically, then fall through
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    if(!xerattrib) {
      xerattrib = new XerAttributes;
    }
    xerattrib->untagged_ = true;
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  case T_SEQ_T:
  case T_SET_T:
  case T_CHOICE_T:
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    chk_SeCho_T();    
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    break;
  case T_CHOICE_A:
    chk_Choice_A();
    break;
  case T_SEQ_A:
  case T_SET_A:
    chk_Se_A();
    break;
  case T_SEQOF:
  case T_SETOF:
    chk_SeOf();
    break;
  case T_REFD:
  case T_ADDRESS:
    chk_refd();
    break;
  case T_SELTYPE:
    chk_seltype();
    break;
  case T_REFDSPEC:
  case T_OCFT:
    u.ref.type_refd->chk();
    u.ref.component_internal = u.ref.type_refd->is_component_internal();
    break;
  case T_ARRAY:
    chk_Array();
    break;
  case T_PORT:
    u.port->chk();
    if (w_attrib_path) u.port->chk_attributes(w_attrib_path);
    break;
  case T_SIGNATURE:
    chk_Signature();
    break;
  case T_COMPONENT:
    u.component->chk();
    break;
  case T_FUNCTION:
  case T_ALTSTEP:
  case T_TESTCASE:
    chk_Fat();
    break;
  default:
    FATAL_ERROR("Type::chk()");
  } // switch

  if(w_attrib_path) {
    switch (get_type_refd_last()->typetype) {
    case T_SEQ_T:
    case T_SET_T:
    case T_CHOICE_T:
      // These types may have qualified attributes
      break;
    case T_SEQOF: case T_SETOF:
      break;
    default:
      w_attrib_path->chk_no_qualif();
      break;
    }
  }
  checked = true;
  if(tags) tags->set_plicit(this);

  /*
  Check all non-table subtype constraints. Table/relational constraints
  are ignored here.
  TODO: non-relational table constraints shall not be ignored.
  */
  if (check_subtype) check_subtype_constraints();

  /*
   * Checking the constraints can be done only if the entire type
   * (including the nested typedefs) is checked, because the
   * component relation constraint has to 'look' into other
   * components.
   */
  if (!parent_type) chk_table_constraints();
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  if (legacy_codec_handling) {
    chk_coding_attribs();
  }
  else if (my_scope != NULL) {
    chk_encodings();
    chk_variants();
  }
  
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  chk_oer();
  
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  chk_finished = true;
}

void Type::chk_coding_attribs()
{
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  if (coding_attribs_checked || (!legacy_codec_handling && !variants_checked)) {
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    return;
  }
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  coding_attribs_checked = true;
  coding_attrib_check_stack.add(this);
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  if (typetype == T_SEQ_T || typetype == T_SET_T || typetype == T_CHOICE_T) {
    // If this record/set/union type has no attributes but one of its fields does,
    // create an empty attribute structure.
    // TODO: do the same for ASN.1 sequence/set/choice types, when ASN.1 gets XER ?
    // The code was originally for TTCN-only encodings.
    if (!rawattrib && hasVariantAttrs() && hasNeedofRawAttrs()) {
      rawattrib = new RawAST(get_default_raw_fieldlength());
    }
    if (!textattrib && hasVariantAttrs() && hasNeedofTextAttrs()) {
      textattrib = new TextAST;
    }
    if (!xerattrib && hasVariantAttrs() && hasNeedofXerAttrs()) {
      xerattrib = new XerAttributes;
    }
    if (!jsonattrib && hasVariantAttrs() && hasNeedofJsonAttrs()) {
      jsonattrib = new JsonAST;
    }
  }
  
  if (rawattrib != NULL || is_root_basic()) {
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    chk_raw();
  }
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  if (textattrib != NULL || is_root_basic()) {
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    chk_text();
  }
  
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  if (jsonattrib != NULL || is_root_basic()) {
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    chk_json();
  }
  
  // We need to call chk_xer() always because it is collecting
  // XER attributes from parent types.
  chk_xer();
  
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  if (!legacy_codec_handling) {
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    if (RecursionTracker::is_happening(this)) {
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      coding_attrib_check_stack.remove(coding_attrib_check_stack.size() - 1);
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      return;
    }
    
    RecursionTracker tracker(this);
    
    if (is_ref()) {
      get_type_refd()->chk_coding_attribs();
    }
    else {
      switch (typetype) {
      case T_SEQ_T:
      case T_SEQ_A:
      case T_SET_T:
      case T_SET_A:
      case T_CHOICE_T:
      case T_CHOICE_A:
      case T_ANYTYPE:
      case T_OPENTYPE:
        for (size_t i = 0; i < get_nof_comps(); ++i) {
          get_comp_byIndex(i)->get_type()->chk_coding_attribs();
        }
        break;
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      case T_ARRAY:
      case T_SEQOF:
      case T_SETOF:
        get_ofType()->chk_coding_attribs();
        break;
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      default:
        break;
      }
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    }
  }
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  coding_attrib_check_stack.remove(coding_attrib_check_stack.size() - 1);
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}

void Type::parse_attributes()
{
  if (raw_parsed) return;

  // The type has no attributes of its own; connect it to the nearest group
  // or the module. This allows global attributes to propagate.
  for (Type *t = this; t && w_attrib_path == 0; t = t->parent_type) {
    switch (t->ownertype) {
    case OT_TYPE_DEF: {
      Ttcn::Def_Type *pwn = static_cast<Ttcn::Def_Type*>(t->owner);
      Ttcn::Group *nearest_group = pwn->get_parent_group();

      w_attrib_path = new WithAttribPath;
      if (nearest_group) { // there is a group
        w_attrib_path->set_parent(nearest_group->get_attrib_path());
      }
      else { // no group, use the module
        Common::Module *mymod = t->my_scope->get_scope_mod();
        // OT_TYPE_DEF is always from a TTCN-3 module
        Ttcn::Module *my_ttcn_module = static_cast<Ttcn::Module *>(mymod);
        w_attrib_path->set_parent(my_ttcn_module->get_attrib_path());
      }
      break; }

    case OT_RECORD_OF:
    case OT_COMP_FIELD:
      continue; // try the enclosing type

    default:
      break;
    }
    break;
  }

  if ((hasVariantAttrs())
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      && (enable_text() || enable_raw() || enable_xer() || enable_json())) {
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#ifndef NDEBUG
    if (rawAST_debug) {
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      const char *fn = get_fullname().c_str();
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      fprintf(stderr, "parse_attributes for %s\n", fn);
    }
#endif
    bool new_raw=false;      // a RawAST  object was allocated here
    bool new_text=false;     // a TextAST object was allocated here
    bool new_xer=false;      // a XerAttribute object was allocated here
    bool new_ber=false;      // a BerAST object was allocated here
    bool new_json = false;   // a JsonAST object was allocated here
    bool raw_found=false;    // a raw  attribute was found by the parser
    bool text_found=false;   // a text attribute was found by the parser
    bool xer_found=false;    // a XER  attribute was found by the parser
    bool ber_found=false;    // a BER attribute was found by the parser
    bool json_found = false; // a JSON attribute was found by the parser
    raw_checked=false;
    text_checked=false;
    json_checked = false;
    xer_checked=false;
    bool override_ref=false;
    // Parse RAW attributes
    switch(typetype) {
    case T_REFD: {
      ReferenceChain refch(this, "While checking attributes");
      if(w_attrib_path)
      {
        // Get all the attributes that apply (from outer scopes too).
        // Outer (generic) first, inner (specific) last.
        const vector<SingleWithAttrib> & real_attribs
          = w_attrib_path->get_real_attrib();

        // see if there's an encode with override
        for(size_t i = real_attribs.size(); i > 0 && !override_ref; i--)
        {
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          if(real_attribs[i-1]->get_modifier() == Ttcn::MOD_OVERRIDE
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            && real_attribs[i-1]->get_attribKeyword()
              != SingleWithAttrib::AT_ENCODE)
            override_ref = true;
        }
      }
      if(!rawattrib && !override_ref){
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        Type *t=this; 
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        refch.reset();
        while(!t->rawattrib && t->is_ref()) t=t->get_type_refd(&refch);
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        rawattrib=new RawAST(t->rawattrib,t->get_default_raw_fieldlength());
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        new_raw=true;
      }
      if(!textattrib && !override_ref){
        Type *t=this;
        refch.reset();
        while(!t->textattrib && t->is_ref()) t=t->get_type_refd(&refch);
        textattrib=new TextAST(t->textattrib);
        new_text=true;
      }
      if (!jsonattrib && !override_ref){
        Type *t = this;
        refch.reset();
        while (!t->jsonattrib && t->is_ref()) {
          t = t->get_type_refd(&refch);
        }
        jsonattrib = new JsonAST(t->jsonattrib);
        new_json = true;
      }
    }
    // no break
    case T_BOOL:
    case T_INT:
    case T_REAL:
    case T_BSTR:
    case T_HSTR:
    case T_OSTR:
    case T_CSTR: // TTCN-3 charstring
    case T_ENUM_T:
      /* The list of types supporting RAW encoding is described in the
       * API guide, section 3.3; this batch of labels plus the next three
       * accurately match the list.
       *
       * For TEXT, it's section 3.4; the list does not include real and
       * bin/hex/octet strings
       */
    case T_USTR: // TTCN-3 universal charstring, this is an addition for XER attributes
    case T_VERDICT: // TTCN-3 verdict, for XER

      if(rawattrib==NULL){
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        rawattrib= new RawAST(get_default_raw_fieldlength());
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        new_raw=true;
      }
      if(textattrib==NULL){textattrib= new TextAST; new_text=true;}
      if (xerattrib==NULL) {
        xerattrib = new XerAttributes; new_xer = true;
      }
      if (berattrib==NULL) {
        berattrib = new BerAST;
        new_ber = true;
      }
      
      if (NULL == jsonattrib) {
        jsonattrib = new JsonAST;
        new_json = true;
      }

      if(w_attrib_path)
      {
        vector<SingleWithAttrib> const &real_attribs
          = w_attrib_path->get_real_attrib();
        // These are attributes without qualifiers.

        size_t nof_elements = real_attribs.size();
        for(size_t i = 0; i < nof_elements; i++)
        {
          SingleWithAttrib *temp_single = real_attribs[i];
          if (temp_single->get_attribKeyword() ==
            SingleWithAttrib::AT_VARIANT) { // only "variant" is parsed
            parse_rawAST(rawattrib, textattrib, xerattrib, berattrib, jsonattrib,
              temp_single->get_attribSpec(), get_length_multiplier(),
              my_scope->get_scope_mod(), 
              raw_found, text_found, xer_found, ber_found, json_found);
//            textattrib->print_TextAST();
//            rawattrib->print_RawAST();
//            xerattrib->print(get_fullname().c_str());
          } // if AT_VARIANT
        } // next i
      }

      if(!raw_found && new_raw){ delete rawattrib; rawattrib=NULL;}
      if(!text_found && new_text){ delete textattrib; textattrib=NULL;}
      if(!xer_found && new_xer){ delete xerattrib; xerattrib = NULL; }
      if(!ber_found && new_ber){ delete berattrib; berattrib = NULL; }
      if (!json_found && new_json) {
        delete jsonattrib;
        jsonattrib = NULL;
      }
      break;
    case T_SEQOF:
    case T_SETOF:
    case T_CHOICE_T:
    case T_SEQ_T:
    case T_SET_T:
    case T_ANYTYPE:
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    case T_ARRAY:
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      if(rawattrib==NULL) {rawattrib= new RawAST(get_default_raw_fieldlength()); new_raw=true;}
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      if(textattrib==NULL){textattrib= new TextAST; new_text=true;}
      if(xerattrib==NULL) {xerattrib = new XerAttributes; new_xer = true;}
      if(berattrib==NULL) {berattrib = new BerAST; new_ber = true;}
      if (NULL == jsonattrib) {
        jsonattrib = new JsonAST;
        new_json = true;
      }

      if(w_attrib_path)
      {
        vector<SingleWithAttrib> const &real_attribs
          = w_attrib_path->get_real_attrib();

        //calculate the type's attributes (the qualifierless ones)
        size_t nof_elements = real_attribs.size();
        for(size_t i = 0; i < nof_elements; i++)
        {
          SingleWithAttrib *temp_single = real_attribs[i];
          if(temp_single->get_attribKeyword() == SingleWithAttrib::AT_VARIANT
            && (!temp_single->get_attribQualifiers()
              || temp_single->get_attribQualifiers()->get_nof_qualifiers()
                  == 0)){
            // raw/text/xer/ber/json attributes for the whole record/seq.
            // (own or inherited)
            parse_rawAST(rawattrib, textattrib, xerattrib, berattrib, jsonattrib,
              temp_single->get_attribSpec(), get_length_multiplier(),
              my_scope->get_scope_mod(),
              raw_found, text_found, xer_found, ber_found, json_found);
          }
        }
        //calculate the components attributes
        MultiWithAttrib* self_attribs = w_attrib_path->get_with_attr();
        if(self_attribs)
        {
          MultiWithAttrib* new_self_attribs = new MultiWithAttrib;
          SingleWithAttrib* swa = 0;

          // copy all the "encode" attributes
          for(size_t i = 0; i < self_attribs->get_nof_elements(); i++)
          {
            if(self_attribs->get_element(i)->get_attribKeyword()
              == SingleWithAttrib::AT_ENCODE)
            {
              // Copy the attribute without qualifiers
              const SingleWithAttrib* swaref = self_attribs->get_element(i);
              swa = new SingleWithAttrib(swaref->get_attribKeyword(),
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                swaref->get_modifier(), 0, swaref->get_attribSpec().clone());
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              new_self_attribs->add_element(swa);
            }
          }

          if(new_self_attribs->get_nof_elements() > 0)
          { // One or more "encode"s were copied; create a context for them.
            // This is a member because is has to be owned by this Type
            // (the components only refer to it).
            encode_attrib_path = new WithAttribPath;
            encode_attrib_path->set_with_attr(new_self_attribs);
            encode_attrib_path->set_parent(w_attrib_path->get_parent());
          }
          else delete new_self_attribs;

          // This should be bool, but gcc 4.1.2-sol8 generates incorrect code
          // with -O2 :(
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          const int se_of = (typetype == T_SEQOF || typetype == T_SETOF ||
            typetype == T_ARRAY);
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          const size_t nof_comps = se_of ? 1 : get_nof_comps();

          // Distribute the attributes with qualifiers to the components.
          // If the type is a sequence-of or set-of, we pretend it to have
          // one component with the name "_0" (a valid TTCN-3 identifier
          // can't begin with an underscore). compiler.y has created
          // the appropriate identifier in the qualifier for a "[-]".
          for(size_t i = 0; i < nof_comps; i++)
          {
            const Identifier& comp_id =
              se_of ? underscore_zero : get_comp_id_byIndex(i);
            MultiWithAttrib* component_attribs = new MultiWithAttrib;

            for(size_t j = 0; j < self_attribs->get_nof_elements(); j++)
            {
              const SingleWithAttrib *temp_single =
                self_attribs->get_element(j);
              Qualifiers* temp_qualifiers =
                temp_single->get_attribQualifiers();
              if( !temp_qualifiers
                || temp_qualifiers->get_nof_qualifiers() == 0) continue;

              Qualifiers* calculated_qualifiers = new Qualifiers;
              bool qualifier_added = false;
              for(size_t k=0; k < temp_qualifiers->get_nof_qualifiers(); )
              {
                const Qualifier* temp_qualifier =
                  temp_qualifiers->get_qualifier(k);
                if(temp_qualifier->get_nof_identifiers() > 0
                  && (*temp_qualifier->get_identifier(0) == comp_id))
                {
                  // Found a qualifier whose first identifier matches
                  //  the component name. Remove the qualifier from the
                  //  enclosing type, chop off its head,
                  //  and add it to the component's qualifiers.
                  calculated_qualifiers->add_qualifier(
                    temp_qualifier->get_qualifier_without_first_id());
                  temp_qualifiers->delete_qualifier(k);
                  qualifier_added = true;
                }
                else k++;
              } // next qualifier

              if(qualifier_added)
              {
                // A copy of temp_single, with new qualifiers
                SingleWithAttrib* temp_single2
                = new SingleWithAttrib(temp_single->get_attribKeyword(),
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                  temp_single->get_modifier(),
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                  calculated_qualifiers,
                  temp_single->get_attribSpec().clone());
                temp_single2->set_location(*temp_single);
                component_attribs->add_element(temp_single2);
              }
              else delete calculated_qualifiers;
            } // next attrib

            if (component_attribs->get_nof_elements() > 0) {
              Type* component_type = se_of ?
                get_ofType() : get_comp_byIndex(i)->get_type();

              if(encode_attrib_path)
                // The record's "encode" attributes (only) apply to the fields.
                // Interpose them in the path of the field.
                component_type->set_parent_path(encode_attrib_path);
              else
                component_type->set_parent_path(w_attrib_path->get_parent());

              component_type->set_with_attr(component_attribs);
            }
            else delete component_attribs;
          } // next component index

          // Any remaining attributes with qualifiers are erroneous
          for(size_t i = 0; i < self_attribs->get_nof_elements();)
          {
            Qualifiers *temp_qualifiers = self_attribs->get_element(i)
                ->get_attribQualifiers();
            if(temp_qualifiers && temp_qualifiers->get_nof_qualifiers() != 0)
            {
              size_t nof_qualifiers = temp_qualifiers->get_nof_qualifiers();
              for(size_t j = 0; j < nof_qualifiers; j++)
              {
                const Qualifier *temp_qualifier =
                  temp_qualifiers->get_qualifier(j);
                const Identifier& tmp_id = *temp_qualifier->get_identifier(0);
                // Special case when trying to reference the inner type
                // of a record-of when it wasn't a record-of.
                if (tmp_id == underscore_zero) temp_qualifier->error(
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                  "Type `%s' cannot be indexed", get_typename().c_str());
                else temp_qualifier->error(
                  "Reference to non-existent field `%s' in type `%s'",
                  tmp_id.get_dispname().c_str(), get_typename().c_str());
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              }
              self_attribs->delete_element(i);
            }else{
              i++;
            }
          } // next i
        } // end if(self_attribs)
      } // end if(w_attrib_path)
      if (!raw_found && new_raw)  { delete rawattrib;  rawattrib = NULL; }
      if (!text_found && new_text){ delete textattrib; textattrib= NULL; }
      if (!xer_found && new_xer)  { delete xerattrib;  xerattrib = NULL; }
      if (!ber_found && new_ber)  { delete berattrib;  berattrib = NULL; }
      if (!json_found && new_json) {
        delete jsonattrib;
        jsonattrib = NULL;
      }
      break;
    default:
      // nothing to do, ASN1 types or types without defined raw attribute
      break;
    } // switch
    if (rawattrib && !enable_raw()) { delete rawattrib;  rawattrib = NULL;}
    if (textattrib&& !enable_text()){ delete textattrib; textattrib= NULL;}
    if (xerattrib && !enable_xer()) { delete xerattrib;  xerattrib = NULL;}
    if (berattrib && !enable_ber()) { delete berattrib;  berattrib = NULL;}
    if (NULL != jsonattrib && !enable_json()) {
      delete jsonattrib;
      jsonattrib = NULL;
    }
  } // endif( hasVariantAttrs && enable_{raw,text,xer} )

  raw_parsed = true;
}

// Implements "NAME AS ..." transformations.
void change_name(string &name, XerAttributes::NameChange change) {
  switch (change.kw_) {
  case NamespaceSpecification::NO_MANGLING:
    break; // cool, nothing to do!

  case NamespaceSpecification::UPPERCASED:
    // Walking backwards calls size() only once. Loop var must be signed.
    for (int i = name.size()-1; i >= 0; --i) {
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      name[i] = (char)toupper(name[i]);
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    }
    break;

  case NamespaceSpecification::LOWERCASED:
    for (int i = name.size()-1; i >= 0; --i) {
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      name[i] = (char)tolower(name[i]);
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    }
    break;

  case NamespaceSpecification::CAPITALIZED:
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    name[0] = (char)toupper(name[0]);
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    break;

  case NamespaceSpecification::UNCAPITALIZED:
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    name[0] = (char)tolower(name[0]);
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    break;

  default: // explicitly specified name
    name = change.nn_;
    break;
  } // switch for NAME
}

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void Type::get_types_w_no_coding_table(vector<Type>& type_list, bool only_own_table)
{
  // this helps avoid infinite recursions in self-referencing types
  if (RecursionTracker::is_happening(this)) {
    return;
  }
  RecursionTracker tracker(this);
  if ((only_own_table && coding_table.size() == 0) ||
      (!only_own_table && get_type_w_coding_table() == NULL)) {
    type_list.add(this);
  }
  switch (get_typetype_ttcn3()) {
  case T_SEQ_T:
  case T_SET_T:
  case T_CHOICE_T:
  case T_ANYTYPE:
  case T_OPENTYPE:
    for (size_t j = 0; j < get_nof_comps(); ++j) {
      get_comp_byIndex(j)->get_type()->get_types_w_no_coding_table(type_list, only_own_table);
    }
    break;
  case T_SEQOF:
  case T_SETOF:
  case T_ARRAY:
    get_ofType()->get_types_w_no_coding_table(type_list, only_own_table);
    break;
  default:
    break;
  }
}

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void Type::chk_encodings()
{
  if (legacy_codec_handling) {
    FATAL_ERROR("Type::chk_encodings");
  }
  switch (get_type_refd_last()->get_typetype_ttcn3()) {
  case T_NULL:
  case T_BOOL:
  case T_INT:
  case T_REAL:
  case T_ENUM_T:
  case T_BSTR:
  case T_HSTR:
  case T_OSTR:
  case T_CSTR:
  case T_USTR:
  case T_OID:
  case T_CHOICE_T:
  case T_SEQOF:
  case T_SETOF:
  case T_SEQ_T:
  case T_SET_T:
  case T_VERDICT:
  case T_ARRAY:
  case T_ANYTYPE:
    if (!is_asn1()) {
      WithAttribPath* ap = get_attrib_path();
      if (ap != NULL) {
        MultiWithAttrib* mwa = ap->get_with_attr();
        if (mwa != NULL) {
          for (size_t i = 0; i < mwa->get_nof_elements(); ++i) {
            const SingleWithAttrib* swa = mwa->get_element(i);
            if (swa->get_attribKeyword() == SingleWithAttrib::AT_ENCODE) {
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              Ttcn::attribute_modifier_t mod = swa->get_modifier();
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              Ttcn::Qualifiers* quals = swa->get_attribQualifiers();
              if (quals != NULL && quals->get_nof_qualifiers() != 0) {
                for (size_t j = 0; j < quals->get_nof_qualifiers(); ++j) {
                  Ttcn::Qualifier* qual = const_cast<Ttcn::Qualifier*>(
                    quals->get_qualifier(j));
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                  Type* t = get_field_type(qual, EXPECTED_CONSTANT);
                  if (t != NULL) {
                    if (t->my_scope != my_scope) {
                      qual->warning("Encode attribute is ignored, because it "
                        "refers to a type from a different type definition");
                    }
                    else {
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                      t->add_coding(swa->get_attribSpec().get_spec(), mod, false);
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                    }
                  }
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                }
              }
              else {
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                add_coding(swa->get_attribSpec().get_spec(), mod, false);
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              }
            }
          }
        }
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        WithAttribPath* global_ap = NULL;
        Ttcn::Def_Type* def = static_cast<Ttcn::Def_Type*>(owner);
        Ttcn::Group* nearest_group = def->get_parent_group();

        if (nearest_group != NULL) { // there is a group
          global_ap = nearest_group->get_attrib_path();
        }
        else { // no group, use the module
          Common::Module* mymod = my_scope->get_scope_mod();
          // OT_TYPE_DEF is always from a TTCN-3 module
          Ttcn::Module* my_ttcn_module = static_cast<Ttcn::Module *>(mymod);
          global_ap = my_ttcn_module->get_attrib_path();
        }
        if (global_ap != NULL) {
          bool has_global_override = false;
          bool modifier_conflict = false;
          Ttcn::attribute_modifier_t first_mod = Ttcn::MOD_NONE;
          const vector<SingleWithAttrib>& real = global_ap->get_real_attrib();
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          for (size_t i = 0; i < real.size(); ++i) {
            const SingleWithAttrib* swa = real[i];
            if (swa->get_attribKeyword() == SingleWithAttrib::AT_ENCODE) {
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              Ttcn::attribute_modifier_t mod = swa->get_modifier();
              if (i == 0) {
                first_mod = mod;
              }
              else if (!modifier_conflict && mod != first_mod) {
                modifier_conflict = true;
                swa->error("All 'encode' attributes of a group or module must "
                  "have the same modifier ('override', '@local' or none)");
              }
              if (mod == Ttcn::MOD_OVERRIDE) {
                has_global_override = true;
              }
              if (has_global_override && modifier_conflict) {
                break;
              }
            }
          }
          // make a list of the type and its field and element types that inherit
          // the global 'encode' attributes
          // overriding global attributes are inherited by types with no coding
          // table (no 'encode' attributes) of their own
          // non-overriding global attributes are inherited by types that have
          // no coding table of their own and cannot use the coding table of any 
          // other type (get_type_w_coding_table() == NULL)
          vector<Type> type_list;
          get_types_w_no_coding_table(type_list, has_global_override);
          if (type_list.size() != 0) {
            for (size_t i = 0; i < real.size(); ++i) {
              const SingleWithAttrib* swa = real[i];
              if (swa->get_attribKeyword() == SingleWithAttrib::AT_ENCODE) {
                for (size_t j = 0; j < type_list.size(); ++j) {
                  type_list[j]->add_coding(swa->get_attribSpec().get_spec(),
                    Ttcn::MOD_NONE, true);
                }
              }
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            }
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            type_list.clear();
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          }
        }
      }
    }
    else {
      switch (ownertype) {
      case OT_TYPE_ASS:
      case OT_RECORD_OF:
      case OT_COMP_FIELD:
      case OT_SELTYPE:
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      case OT_FIELDSETTING:
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        // ASN.1 types automatically have BER, PER, XER, OER and JSON encoding
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        add_coding(string("BER:2002"), Ttcn::MOD_NONE, true);
        add_coding(string(get_encoding_name(CT_PER)), Ttcn::MOD_NONE, true);
        add_coding(string(get_encoding_name(CT_JSON)), Ttcn::MOD_NONE, true);
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        add_coding(string(get_encoding_name(CT_OER)), Ttcn::MOD_NONE, true);
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        if (asn1_xer) {
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          // XER encoding for ASN.1 types can be forced with a command line option
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          add_coding(string(get_encoding_name(CT_XER)), Ttcn::MOD_NONE, true);
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        }
        break;
      default:
        break;
      }      
    }
    break;
  default:
    // the rest of the types can't have 'encode' attributes
    break;
  }
}

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void Type::chk_variants()
{
  if (legacy_codec_handling) {
    FATAL_ERROR("Type::chk_encodings");
  }
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  variants_checked = true;
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  if (is_asn1() || ownertype != OT_TYPE_DEF) {
    return;
  }
  // check global (group/module) variant attributes first
  WithAttribPath* global_ap = NULL;
  Ttcn::Def_Type* def = static_cast<Ttcn::Def_Type*>(owner);
  Ttcn::Group* nearest_group = def->get_parent_group();

  if (nearest_group != NULL) { // there is a group
    global_ap = nearest_group->get_attrib_path();
  }
  else { // no group, use the module
    Common::Module* mymod = my_scope->get_scope_mod();
    // OT_TYPE_DEF is always from a TTCN-3 module
    Ttcn::Module* my_ttcn_module = static_cast<Ttcn::Module *>(mymod);
    global_ap = my_ttcn_module->get_attrib_path();
  }
  if (global_ap != NULL) {
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    // process all global variants, not just the closest group
    const vector<SingleWithAttrib>& real = global_ap->get_real_attrib();
    for (size_t i = 0; i < real.size(); ++i) {
      const SingleWithAttrib* swa = real[i];
      if (swa->get_attribKeyword() == SingleWithAttrib::AT_VARIANT) {
        chk_this_variant(swa, true);
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      }
    }
  }
  // check local variant attributes second, so they overwrite global ones if they
  // conflict with each other
  WithAttribPath* ap = get_attrib_path();
  if (ap != NULL) {
    MultiWithAttrib* mwa = ap->get_with_attr();
    if (mwa != NULL) {
      for (size_t i = 0; i < mwa->get_nof_elements(); ++i) {
        const SingleWithAttrib* swa = mwa->get_element(i);
        if (swa->get_attribKeyword() == SingleWithAttrib::AT_VARIANT) {
          Ttcn::Qualifiers* quals = swa->get_attribQualifiers();
          if (quals != NULL && quals->get_nof_qualifiers() != 0) {
            for (size_t j = 0; j < quals->get_nof_qualifiers(); ++j) {
              Ttcn::Qualifier* qual = const_cast<Ttcn::Qualifier*>(
                quals->get_qualifier(j));
              Type* t = get_field_type(qual, EXPECTED_CONSTANT);
              if (t != NULL) {
                if (t->my_scope != my_scope) {
                  qual->warning("Variant attribute is ignored, because it refers "
                    "to a type from a different type definition");
                }
                else {
                  t->chk_this_variant(swa, false);
                }
              }
            }
          }
          else {
            chk_this_variant(swa, false);
          }
        }
      }
    }
  }
  // check the coding attributes set by the variants
  chk_coding_attribs();
}

void Type::chk_this_variant(const Ttcn::SingleWithAttrib* swa, bool global)
{
  // TODO: use something other than get_typename...
  Type* t = get_type_w_coding_table();
  if (t == NULL) {
    if (!global) {
      swa->error("No encoding rules defined for type `%s'",
        get_typename().c_str());
    }
  }
  else {
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    const vector<string>* coding_strings = swa->get_attribSpec().get_encodings();
    // gather the built-in codecs referred to by the variant's encoding strings
    vector<MessageEncodingType_t> codings;
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    bool erroneous = false;
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    if (coding_strings == NULL) {
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      if (t->coding_table.size() > 1) {
        if (!global) {
          swa->error("The encoding reference is mandatory for variant attributes "
            "of type `%s', which has multiple encodings", get_typename().c_str());
        }
        erroneous = true;
      }
      else if (t->coding_table[0]->built_in) {
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        codings.add(new MessageEncodingType_t(t->coding_table[0]->built_in_coding));
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      }
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      else { // PER or custom encoding
        MessageEncodingType_t coding =
          strcmp(t->coding_table[0]->custom_coding.name, "PER") == 0 ?
          CT_PER : CT_CUSTOM;
        swa->warning("Variant attributes related to %s encoding are ignored",
          get_encoding_name(coding));
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      }
    }
    else {
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      for (size_t i = 0; i < coding_strings->size(); ++i) {
        const string& enc_str = *(*coding_strings)[i];
        MessageEncodingType_t coding = get_enc_type(enc_str);
        if (!has_encoding(coding, &enc_str)) {
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