idlcomp/languages/c++/main.cc

   1 // idlcomp/languages/c++/main.cc -- C++ IDL binding
   2 //
   3 // This software is copyright (c) 2006 Scott Wood <scott@buserror.net>.
   4 //
   5 // This software is provided 'as-is', without any express or implied warranty.
   6 // In no event will the authors or contributors be held liable for any damages
   7 // arising from the use of this software.
   8 //
   9 // Permission is hereby granted to everyone, free of charge, to use, copy,
  10 // modify, prepare derivative works of, publish, distribute, perform,
  11 // sublicense, and/or sell copies of the Software, provided that the above
  12 // copyright notice and disclaimer of warranty be included in all copies or
  13 // substantial portions of this software.
  14
  15 // FIXME: escape C++ reserved words
  16
  17 #include <cerrno>
  18
  19 #include <sys/types.h>
  20 #include <sys/stat.h>
  21
  22 #include <targets.h>
  23 #include "c++.h"
  24
  25 CPPBinding cppbinding;
  26
  27 CPPFile::CPPFile(UserNameSpace *NS, const char *dir) :
  28 dirname(dir)
  29 {
  30         indent.indent_level = 0;
  31         indent.align_spaces = 0;
  32         do_extra_newline = true;
  33         ns = NS;
  34
  35         dirname.append(1, '/');
  36         dirname.append(ns->name);
  37         string headername(dirname);
  38         headername.append(".h");
  39
  40         file.open(headername.c_str());
  41         if (!file.is_open()) {
  42                 fprintf(stderr, "Could not create output file \"%s\": %s.\n",
  43                         headername.c_str(), strerror(errno));
  44
  45                 throw UserError();
  46         }
  47
  48         if (mkdir(dirname.c_str(), 0777) < 0) {
  49                 fprintf(stderr, "Could not create output directory \"%s\": %s.\n",
  50                         dir, strerror(errno));
  51
  52                 throw UserError();
  53         }
  54
  55         file <<   "// " << *ns->get_fq_name()->flatten(".")
  56              << "\n// This is a C++ language binding generated by idlc.\n"
  57              <<   "// Do not modify this file directly.\n\n";
  58
  59         fqname = ns->get_fq_name();
  60         String *fqname_flat = ns->get_fq_name()->flatten("_IDLNS_");
  61         file <<   "#ifndef IDL_HDR_" << *fqname_flat
  62              << "\n#define IDL_HDR_" << *fqname_flat << "\n\n";
  63
  64         file << "#include <orb.h>\n";
  65
  66         first_traversal = ++traversal;
  67         assert(first_traversal >= 0);
  68
  69         for (NameSpace::const_iterator i = ns->begin(); i != ns->end(); ++i) {
  70                 Symbol *sym = (*i).second;
  71                 UserNameSpace *uns = dynamic_cast<UserNameSpace *>(sym);
  72
  73                 if (uns) {
  74                         file << "#include \"" << **ns->name << '/' << **uns->name << ".h\"\n";
  75
  76                         // Process namespaces first, to minimize duplicate definitions
  77                         // if this namespace depends on something declared in a sub
  78                         // namespace.
  79
  80                         output(uns);
  81                 }
  82         }
  83
  84         for (NameSpace::const_iterator i = ns->begin(); i != ns->end(); ++i) {
  85                 Symbol *sym = (*i).second;
  86                 UserNameSpace *uns = dynamic_cast<UserNameSpace *>(sym);
  87
  88                 if (!uns)
  89                         output_pass(sym, trav_nsdecl);
  90         }
  91
  92         for (NameSpace::const_iterator i = ns->begin(); i != ns->end(); ++i) {
  93                 Symbol *sym = (*i).second;
  94                 UserNameSpace *uns = dynamic_cast<UserNameSpace *>(sym);
  95
  96                 if (!uns)
  97                         output_pass(sym, trav_full);
  98         }
  99 }
 100
 101 CPPFile::~CPPFile()
 102 {
 103         file << "#endif\n";
 104
 105         assert(indent.indent_level == 0);
 106 }
 107
 108 void CPPFile::ifndef_in(Symbol *sym, const char *extra)
 109 {
 110         StrList *fqname = sym->get_fq_name();
 111         String *fqname_flat = fqname->flatten("_IDLNS_");
 112
 113         assert(indent.indent_level == 0);
 114
 115         file << "\n#ifndef IDL_DUP_" << extra << *fqname_flat
 116              << "\n#define IDL_DUP_" << extra << *fqname_flat << "\n";
 117 }
 118
 119 void CPPFile::ifndef_out()
 120 {
 121         file << "\n#endif\n";
 122 }
 123
 124 void CPPFile::ns_in(Symbol *sym, const char *extra)
 125 {
 126         // Only output user namespaces here; if we're defining a nested type,
 127         // it will have been forward declared already, and thus the
 128         // non-user-namespaces can be specified directly in the definition.
 129         //
 130         // For non-forward-declarables such as metadata, use all_ns_in.
 131
 132         StrList *ns_fqname = sym->find_toplevel_type()->get_ns()->get_fq_name();
 133
 134         ifndef_in(sym, extra);
 135
 136         for (StrList::const_iterator i = ns_fqname->begin();
 137              i != ns_fqname->end(); ++i) {
 138                 const String *str = *i;
 139                 file << "namespace " << *str << " {\n";
 140         }
 141
 142         downscope();
 143 }
 144
 145 void CPPFile::ns_out(Symbol *sym)
 146 {
 147         upscope();
 148         assert(indent.indent_level == 0);
 149
 150         for (Symbol *s = sym->find_toplevel_type()->get_ns(); s != toplevel;
 151              s = s->get_ns())
 152                 file << "}";
 153
 154         ifndef_out();
 155 }
 156
 157 void CPPFile::all_ns_in(Symbol *sym, bool include_self, const char *extra)
 158 {
 159         NameSpace *ns = sym->find_toplevel_type()->get_ns();
 160         StrList *ns_fqname = ns->get_fq_name();
 161
 162         ifndef_in(sym, extra);
 163
 164         for (StrList::const_iterator i = ns_fqname->begin();
 165              i != ns_fqname->end(); ++i) {
 166                 const String *str = *i;
 167                 file << "namespace " << *str << " {\n";
 168         }
 169
 170         stack<SymbolRef> typens;
 171
 172         if (!include_self)
 173                 sym = sym->get_ns();
 174
 175         for (Symbol *s = sym; s != ns; s = s->get_ns())
 176                 typens.push(s);
 177
 178         while (!typens.empty()) {
 179                 Symbol *s = typens.top();
 180                 typens.pop();
 181                 file << "namespace " << **s->name << "_ns {\n";
 182         }
 183
 184         downscope();
 185 }
 186
 187 void CPPFile::all_ns_out(Symbol *sym, bool include_self)
 188 {
 189         upscope();
 190         assert(indent.indent_level == 0);
 191
 192         if (!include_self)
 193                 sym = sym->get_ns();
 194
 195         for (Symbol *s = sym; s != toplevel; s = s->get_ns())
 196                 file << "}";
 197
 198         ifndef_out();
 199 }
 200
 201 String &CPPFile::get_definition_name(Symbol *sym, const char *prefix)
 202 {
 203         NameSpace *ns = sym->get_ns();
 204         UserNameSpace *uns = dynamic_cast<UserNameSpace *>(ns);
 205         String *str;
 206
 207         if (!uns) {
 208                 str = &get_definition_name(ns);
 209                 str->append("_ns::");
 210         } else {
 211                 str = new String();
 212         }
 213
 214         str->append(prefix);
 215         str->append(**sym->name);
 216         return *str;
 217 }
 218
 219 void cpp_output_name(ostream &file, Symbol *sym, const char *prefix)
 220 {
 221         StrList *sl = sym->get_fq_name("_ns");
 222         sl->pop_back();
 223
 224         file << "::" << *sl->flatten("::") << "::" << prefix << **sym->name;
 225 }
 226
 227 void CPPFile::output(UserNameSpace *sym, int pass, void *arg2)
 228 {
 229         assert(indent.indent_level == 0);
 230         delete new CPPFile(sym, dirname.c_str());
 231 }
 232
 233 static inline int round_up_bits(int bits)
 234 {
 235         assert(bits >= 1 && bits <= 64);
 236
 237         if (bits > 32)
 238                 return 64;
 239         if (bits > 16)
 240                 return 32;
 241         if (bits > 8)
 242                 return 16;
 243
 244         return 8;
 245 }
 246
 247 // FIXME: Inline arrays...
 248 void cpp_output_type(ostream &file, Type *t, bool array, bool is_mutable)
 249 {
 250         if (array) {
 251                 file << "::System::RunTime::";
 252
 253                 if (is_mutable)
 254                         file << "Mutable";
 255
 256                 file << "Array< ";
 257         }
 258
 259         cpp_output_name(file, t);
 260
 261         if (array)
 262                 file << ">";
 263
 264         file << ' ';
 265 }
 266
 267 // FIXME: Inline arrays...
 268 void cpp_output_type(ostream &file, CompiledBasicType &t, bool is_mutable)
 269 {
 270         if (is_array(t)) {
 271                 file << "::System::RunTime::";
 272
 273                 if (is_mutable)
 274                         file << "Mutable";
 275
 276                 file << "Array< ";
 277         }
 278
 279         if (t.flags.field.Bool) {
 280                 // Don't rely on C++ to provide any particular representation
 281                 // of bool...
 282                 file << "uint8_t";
 283         } else if (t.flags.field.Float) {
 284                 if (t.bits == 32)
 285                         file << "float";
 286                 else
 287                         file << "double";
 288         } else {
 289                 if (t.flags.field.Unsigned)
 290                         file << 'u';
 291
 292                 file << "int" << round_up_bits(t.bits) << "_t";
 293         }
 294
 295         if (is_array(t))
 296                 file << '>';
 297
 298         file << ' ';
 299 }
 300
 301 // FIXME: implement padding
 302 int CPPFile::output_datum(Struct *ns, Datum *d, int offset)
 303 {
 304         if (d->type) {
 305                 cpp_output_type(file, d->type, is_array(d->def.basictype),
 306                                 !d->def.flags.field.Immutable);
 307
 308                 Struct *dtype = dynamic_cast<Struct *>(*d->type);
 309                 if (dtype && !dtype->is_inline())
 310                         file << '*';
 311         } else {
 312                 cpp_output_type(file, d->def.basictype,
 313                                 !d->def.flags.field.Immutable);
 314         }
 315
 316         return offset;
 317 }
 318
 319 void CPPFile::declare_type_dependency(Type *t, bool need_obj_def)
 320 {
 321         Symbol *toplevel_type = t->find_toplevel_type();
 322
 323         assert(indent.indent_level == 0);
 324
 325         output_pass(toplevel_type, trav_nsdecl);
 326
 327         if (t == toplevel_type)
 328                 output_pass(t, trav_forward);
 329
 330         if (dynamic_cast<Interface *>(t))
 331                 output_pass(t, need_obj_def ? trav_obj_def : trav_obj_stub);
 332         else if (!dynamic_cast<Struct *>(t) || need_obj_def)
 333                 output_pass(t, trav_full);
 334 }
 335
 336 void CPPFile::declare_dependencies(Interface *iface, bool need_obj_def)
 337 {
 338         for (Interface::methods_iterator i = iface->methods_begin();
 339              i != iface->methods_end(); ++i)
 340         {
 341                 Method *m = *i;
 342                 for (Method::entries_iterator j = m->entries_begin();
 343                      j != m->entries_end(); ++j)
 344                 {
 345                         Param *p = *j;
 346                         if (p->type)
 347                                 declare_type_dependency(p->type, need_obj_def);
 348                 }
 349         }
 350
 351         for (Interface::supers_iterator i = iface->supers_begin();
 352              i != iface->supers_end(); ++i)
 353         {
 354                 Interface *super = *i;
 355                 declare_type_dependency(super);
 356         }
 357 }
 358
 359 void CPPFile::declare_dependencies(Struct *str)
 360 {
 361         for (NameSpace::const_iterator i = str->begin(); i != str->end(); ++i) {
 362                 Symbol *sym = (*i).second;
 363                 Datum *d = dynamic_cast<Datum *>(sym);
 364                 if (d) {
 365                         if (d->type)
 366                                 declare_type_dependency(d->type, d->is_inline());
 367
 368                         continue;
 369                 }
 370
 371                 Struct *mstr = dynamic_cast<Struct *>(sym);
 372                 if (mstr) {
 373                         declare_dependencies(mstr);
 374                         continue;
 375                 }
 376
 377                 Interface *miface = dynamic_cast<Interface *>(sym);
 378                 if (miface)
 379                         declare_dependencies(miface);
 380         }
 381 }
 382
 383 void CPPFile::output_guid(const uint64_t *guid64)
 384 {
 385         const unsigned char *guid = reinterpret_cast<const unsigned char *>(guid64);
 386         char guidhex[7];
 387
 388         file << indent << "static const __attribute__((unused))\n"
 389              << indent << "::System::RunTime::GUID _guid = {\n"
 390              << indent << "\t{ ";
 391
 392         for (int i = 0; i < 16; i++) {
 393                 if (i == 8)
 394                         file << '\n' << indent << "\t  ";
 395
 396                 sprintf(guidhex, "0x%02x, ", *guid++);
 397                 file << guidhex;
 398         }
 399
 400         file << "}\n"
 401              << indent << "};\n";
 402
 403         do_extra_newline = true;
 404 }
 405
 406 void CPPFile::output_nsdecl(NameSpace *ns, nsdecl_callback cb)
 407 {
 408         // If indent level is not zero, this is a nested struct or interface.
 409         if (indent.indent_level == 0)
 410                 ns_in(ns, "NS_");
 411         else
 412                 extra_newline();
 413
 414         file << indent << "namespace " << **ns->name << "_ns {\n";
 415         downscope();
 416
 417         if (cb)
 418                 cb(this, ns);
 419
 420         for (NameSpace::const_iterator i = ns->begin(); i != ns->end(); ++i) {
 421                 Symbol *sym = (*i).second;
 422
 423                 assert(pass_needed(sym, trav_forward));
 424                 assert(pass_needed(sym, trav_nsdecl));
 425
 426                 // If it's a Method or a non-const Datum, this is a no-op.
 427                 output_pass(sym, trav_forward);
 428                 output_pass(sym, trav_nsdecl);
 429         }
 430
 431         upscope();
 432
 433         file << indent << "}\n";
 434
 435         if (indent.indent_level == 1)
 436                 ns_out(ns);
 437 }
 438
 439 void CPPFile::output_aliases_and_types(NameSpace *ns)
 440 {
 441         for (NameSpace::const_iterator i = ns->begin(); i != ns->end(); ++i) {
 442                 Symbol *sym = (*i).second;
 443                 if (dynamic_cast<Alias *>(sym) || dynamic_cast<Type *>(sym))
 444                         output_pass(sym, trav_full);
 445         }
 446 }
 447
 448 void CPPFile::output_vstruct_ns(CPPFile *cpp, NameSpace *sym)
 449 {
 450         Struct *str = dynamic_cast<Struct *>(sym);
 451         assert(str);
 452         assert(str->is_virtual());
 453
 454         cpp->output_guid(str->def.guid);
 455 }
 456
 457 void CPPFile::output_vstruct_info(Struct *sym)
 458 {
 459         all_ns_in(sym, true, "VINFO_");
 460
 461         file << indent << "static const __attribute__((unused)) "
 462                           "unsigned long *const _guids[] = {\n";
 463
 464         stack<StructRef> supers;
 465         sym->chainlen = 0;
 466
 467         for (Struct *i = sym; i; i = i->get_super()) {
 468                 sym->chainlen++;
 469                 supers.push(i);
 470         }
 471
 472         for (int i = 0; i < sym->chainlen; i++) {
 473                 Struct *super = supers.top();
 474                 supers.pop();
 475
 476                 file << indent << '\t';
 477                 cpp_output_name(file, super);
 478                 file << "_ns::_guid.l,\n";
 479         }
 480
 481         file << indent << "};\n\n"
 482              << indent << "static const __attribute__((unused)) "
 483                           "::System::RunTime::VStructInfo _info = {\n"
 484              << indent << "\t_guids, " << sym->chainlen << ",\n"
 485 #if 0
 486              << indent << "\t_marshall, _unmarshall,\n"
 487 #endif
 488              << indent << "};\n";
 489
 490
 491         all_ns_out(sym, true);
 492 }
 493
 494 void CPPFile::output_vstruct_main(Struct *sym)
 495 {
 496         assert(sym->is_virtual());
 497         Struct *super = sym->get_super();
 498
 499         const char *name = sym->name->c_str();
 500
 501         if (!super) {
 502                 assert(sym == System_VStruct);
 503                 file << indent << "const ::System::RunTime::VStructInfo "
 504                                   "*const _infoptr;\n\n";
 505         }
 506
 507         file << indent << name
 508              << "(const ::System::RunTime::VStructInfo *realinfo = &"
 509              << name << "_ns::_info) :\n"
 510              << indent;
 511
 512         if (!super)
 513                 file << "_infoptr";
 514         else
 515                 cpp_output_name(file, super);
 516
 517         file << "(realinfo)\n"
 518              << indent << "{\n"
 519              << indent << "}\n";
 520
 521         if (super)
 522                 file << '\n'
 523                      << indent << "static " << name << " *downcast(::System::VStruct *base)\n"
 524                      << indent << "{\n"
 525                      << indent << "\tif (!base)\n"
 526                      << indent << "\t\treturn NULL;\n\n"
 527                      << indent << "\tconst ::System::RunTime::VStructInfo *info = base->_infoptr;\n\n"
 528                      << indent << "\tif (info->chainlen < " << sym->chainlen << ")\n"
 529                      << indent << "\t\treturn NULL;\n\n"
 530                      << indent << "\tif (::System::RunTime::guids_equal(info->guids["
 531                                << sym->chainlen - 1 << "], " << name << "_ns::_guid.l))\n"
 532                      << indent << "\t\treturn static_cast<" << name << " *>(base);\n\n"
 533                      << indent << "\treturn NULL;\n"
 534                      << indent << "}\n";
 535
 536         do_extra_newline = true;
 537 }
 538
 539 // Output an init method that initializes all the elements in the
 540 // struct; this is useful for throwing exceptions.  Due to the
 541 // annoying, apparently unwaiveable-by-the-struct requirement that any
 542 // struct with a ctor be initialized using the ctor (and thus at
 543 // runtime, not statically), this can't be an actual ctor in
 544 // non-virtual structs.
 545 //
 546 // In virtual structs, there's already a ctor, so it wouldn't
 547 // matter.  It'd generally be best to be consistent and use the
 548 // init method for both, but the main intended use for this is
 549 // throwing exceptions (which are virtual), and it'd be
 550 // unfortunate to cripple 99% of the uses with unnecessary
 551 // syntactic cruft.  The init method will remain available
 552 // for vstructs so that things won't break if a non-vstruct
 553 // gets made virtual (or if a user really wants to be consistent
 554 // between both types in their own code).
 555
 556 void CPPFile::output_struct_ctor(Struct *sym, bool extra_vstruct)
 557 {
 558         const char *method_name = extra_vstruct ? sym->name->c_str() : " _init";
 559
 560         file << '\n' << indent << **sym->name;
 561         indent.align_spaces = sym->name->length() + 1;
 562
 563         if (!extra_vstruct) {
 564                 file << " &_init";
 565                 indent.align_spaces += 7;
 566         }
 567
 568         file << '(';
 569         output_struct_ctor_rec1(sym, 0);
 570
 571         if (extra_vstruct) {
 572                 Struct *super = sym->get_super();
 573
 574                 file << ",\n" << indent
 575                      << "const ::System::RunTime::VStructInfo *_realinfo = &"
 576                      << **sym->name << "_ns::_info) :\n";
 577
 578                 indent.align_spaces = 0;
 579                 file << indent;
 580
 581                 if (!super)
 582                         file << "_infoptr";
 583                 else
 584                         cpp_output_name(file, super);
 585
 586                 file << "(_realinfo";
 587         }
 588
 589         indent.align_spaces = 0;
 590         file << ")\n" << indent << "{\n";
 591
 592         indent.indent_level++;
 593
 594         output_struct_ctor_rec2(sym, 0);
 595
 596         if (!extra_vstruct)
 597                 file << indent << "return *this;\n";
 598
 599         indent.indent_level--;
 600         file << indent << "}\n";
 601 }
 602
 603 int CPPFile::output_struct_ctor_rec1(Struct *sym, int num)
 604 {
 605         if (sym->get_super())
 606                 num = output_struct_ctor_rec1(sym->get_super(), num);
 607
 608         for (Struct::entries_iterator i = sym->entries_begin();
 609              i != sym->entries_end(); ++i)
 610         {
 611                 if (num++)
 612                         file << ",\n" << indent;
 613
 614                 output_datum(sym, *i, -1);
 615                 file << "_arg" << num;
 616         }
 617
 618         return num;
 619 }
 620
 621 int CPPFile::output_struct_ctor_rec2(Struct *sym, int num)
 622 {
 623         if (sym->get_super())
 624                 num = output_struct_ctor_rec2(sym->get_super(), num);
 625
 626         for (Struct::entries_iterator i = sym->entries_begin();
 627              i != sym->entries_end(); ++i)
 628         {
 629                 Datum *d = *i;
 630                 file << indent << **d->name << " = _arg" << ++num << ";\n";
 631         }
 632
 633         return num;
 634 }
 635
 636 void CPPFile::output(Struct *sym, int pass, void *arg2)
 637 {
 638         switch (pass) {
 639                 case trav_nsdecl:
 640                         if (sym->is_virtual()) {
 641                                 output_nsdecl(sym, output_vstruct_ns);
 642                         } else {
 643                                 output_nsdecl(sym);
 644                         }
 645
 646                         break;
 647
 648                 case trav_forward: {
 649                         bool nested = indent.indent_level != 0;
 650
 651                         if (!nested)
 652                                 ns_in(sym, "FWD_");
 653                         else
 654                                 extra_newline();
 655
 656                         file << indent << "struct " << **sym->name << ";\n";
 657
 658                         if (!nested)
 659                                 ns_out(sym);
 660
 661                         break;
 662                 }
 663
 664                 case trav_full: {
 665                         output_pass(sym, trav_nsdecl);
 666                         Struct *super = sym->get_super();
 667
 668                         if (super)
 669                                 output_pass(super, trav_full);
 670
 671                         if (sym->is_virtual())
 672                                 output_vstruct_info(sym);
 673
 674                         declare_dependencies(sym);
 675                         ns_in(sym);
 676
 677                         file << indent << "struct " << get_definition_name(sym);
 678
 679                         if (super) {
 680                                 const String *supername = super->get_fq_name("_ns")
 681                                                                ->flatten("::");
 682                                 file << " :\n" << indent << "public ::" << *supername;
 683                         }
 684
 685                         file << "\n" << indent << "{\n";
 686                         downscope();
 687
 688                         if (sym->is_virtual())
 689                                 output_vstruct_main(sym);
 690
 691                         int offset = 0;
 692                         for (Struct::entries_iterator i = sym->entries_begin();
 693                              i != sym->entries_end(); ++i)
 694                         {
 695                                 extra_newline();
 696                                 Datum *d = *i;
 697                                 file << indent;
 698                                 offset = output_datum(sym, d, offset);
 699                                 file << **d->name << ";\n";
 700                         }
 701
 702                         bool empty_struct = true;
 703                         for (Struct *s = sym; s; s = s->get_super()) {
 704                                 if (s->entries_begin() != s->entries_end()) {
 705                                         empty_struct = false;
 706                                         break;
 707                                 }
 708                         }
 709
 710                         if (!empty_struct) {
 711                                 output_struct_ctor(sym, false);
 712
 713                                 if (sym->is_virtual())
 714                                         output_struct_ctor(sym, true);
 715                         }
 716
 717                         upscope();
 718                         file << indent << "};\n";
 719
 720                         ns_out(sym);
 721
 722                         output_aliases_and_types(sym);
 723
 724                         for (NameSpace::const_iterator i = sym->begin(); i != sym->end(); ++i) {
 725                                 Symbol *sym2 = (*i).second;
 726                                 output_pass(sym2, trav_full);
 727                         }
 728
 729                         break;
 730                 }
 731
 732                 default:
 733                         BUG();
 734         }
 735 }
 736
 737 void CPPFile::output_iface_ns(CPPFile *file, NameSpace *sym)
 738 {
 739         Interface *i = dynamic_cast<Interface *>(sym);
 740         assert(i);
 741
 742         file->output_guid(i->def.guid);
 743         file->output_ifaceinfo(i);
 744 }
 745
 746 void CPPFile::output(Interface *sym, int pass, void *arg2)
 747 {
 748         switch (pass) {
 749                 case trav_nsdecl:
 750                         output_nsdecl(sym, output_iface_ns);
 751                         break;
 752
 753                 case trav_forward: {
 754                         bool nested = indent.indent_level != 0;
 755
 756                         if (!nested)
 757                                 ns_in(sym, "FWD_");
 758                         else
 759                                 extra_newline();
 760
 761                         file << indent << "struct " << **sym->name << ";\n"
 762                              << indent << "struct _i_" << **sym->name << ";\n";
 763
 764                         if (!nested)
 765                                 ns_out(sym);
 766
 767                         break;
 768                 }
 769
 770                 case trav_obj_stub: {
 771                         output_pass(sym, trav_forward);
 772
 773                         for (Interface::supers_iterator i = sym->supers_begin();
 774                              i != sym->supers_end(); ++i)
 775                         {
 776                                 Interface *super = *i;
 777                                 output_pass(super, trav_obj_stub);
 778                         }
 779
 780                         declare_dependencies(sym);
 781                         ns_in(sym, "STUB_");
 782
 783                         file << indent << "struct "
 784                              << get_definition_name(sym) << " {\n";
 785
 786                         downscope();
 787
 788                         output_wrapper(sym);
 789
 790                         upscope();
 791                         file << indent << "};\n";
 792
 793                         ns_out(sym);
 794                         break;
 795                 }
 796
 797                 case trav_obj_def: {
 798                         output_pass(sym, trav_obj_stub);
 799
 800                         for (Interface::supers_iterator i = sym->supers_begin();
 801                              i != sym->supers_end(); ++i)
 802                         {
 803                                 Interface *super = *i;
 804                                 output_pass(super, trav_full);
 805                         }
 806
 807                         declare_dependencies(sym);
 808                         ns_in(sym, "OBJDEF_");
 809
 810                         file << indent << "struct ";
 811                         file << get_definition_name(sym, "_i_") << " {\n";
 812
 813                         downscope();
 814
 815                         output_internal(sym);
 816
 817                         upscope();
 818                         file << indent << "};\n\n";
 819
 820                         output_casts(sym);
 821
 822                         ns_out(sym);
 823                         break;
 824
 825                 case trav_full:
 826                         output_pass(sym, trav_obj_def);
 827
 828                         declare_dependencies(sym, true);
 829                         ns_in(sym);
 830
 831                         output_method_defs(sym);
 832
 833                         ns_out(sym);
 834                         output_aliases_and_types(sym);
 835
 836                         for (NameSpace::const_iterator i = sym->begin(); i != sym->end(); ++i) {
 837                                 Symbol *sym2 = (*i).second;
 838                                 output_pass(sym2, trav_full);
 839                         }
 840
 841                         break;
 842
 843                 default:
 844                         BUG();
 845                 }
 846         }
 847 }
 848
 849 void CPPFile::output_bf_elem(Datum *d, int pos, int bits,
 850                              string &prefix)
 851 {
 852         Type *t = d->type;
 853         BitField *bf = dynamic_cast<BitField *>(t);
 854         Enum *en = dynamic_cast<Enum *>(t);
 855
 856         string fieldname;
 857
 858         if (!d->name->compare(0, 4, "get_") ||
 859             !d->name->compare(0, 4, "set_"))
 860                 fieldname = '_';
 861
 862         fieldname.append(**d->name);
 863
 864         if (bf) {
 865                 string newprefix(prefix);
 866                 newprefix.append(**d->name);
 867                 newprefix.append("_IDLNS_");
 868                 output_bf(bf, d->def.icon, bits, newprefix);
 869
 870                 // FIXME: getters and setters
 871         } else if (en || !t) {
 872                 file << indent << "uint" << bits << "_t "
 873                      << prefix << fieldname << ':' << d->def.icon << ";\n";
 874         } else {
 875                 // This is checked here rather than in input.cc, because
 876                 // I'm lazy.
 877
 878                 fprintf(stderr, "idlc: Bad input: \"%s\" cannot be the type of \"%s\"\n",
 879                         t->get_fq_name()->flatten()->c_str(),
 880                         d->get_fq_name()->flatten()->c_str());
 881
 882                 throw UserError();
 883         }
 884 }
 885
 886 void CPPFile::output_bf(BitField *sym, int bits, int typebits,
 887                         string &prefix)
 888 {
 889         int size = 0;
 890
 891         assert(bits == sym->def.bits || bits == typebits);
 892
 893         for (BitField::entries_iterator i = sym->entries_begin();
 894              i != sym->entries_end(); ++i)
 895                 size += (*i)->def.icon;
 896
 897         if (size > sym->def.bits) {
 898                 // FIXME: This isn't detected in the front end,
 899                 // but even once it is, this should stay as a
 900                 // replacement for input.cc checking.
 901
 902                 fprintf(stderr, "idlc: \"%s\" is too small (%d bits) for its "
 903                                 "contents (%d bits)\n",
 904                         sym->get_fq_name()->flatten()->c_str(),
 905                         sym->def.bits, size);
 906
 907                 throw UserError();
 908         }
 909
 910         if (target->bitfield_big_endian) {
 911                 if (size != bits) {
 912                         // The prefix is put at the end, so that we can avoid
 913                         // consecutive underscores or an underscore followed
 914                         // by a capital, both of which are reserved in C++.
 915
 916                         file << indent << "uint" << bits << "_t _pad_" << prefix
 917                              << ':' << bits - size << ";\n";
 918                 }
 919
 920                 int pos = sym->def.bits;
 921
 922                 for (BitField::entries_reverse_iterator i = sym->entries_rbegin();
 923                      i != sym->entries_rend(); ++i)
 924                 {
 925                         Datum *d = *i;
 926                         pos -= d->def.icon;
 927                         output_bf_elem(d, pos, typebits, prefix);
 928                 }
 929         } else {
 930                 int pos = 0;
 931
 932                 for (BitField::entries_iterator i = sym->entries_begin();
 933                      i != sym->entries_end(); ++i)
 934                 {
 935                         Datum *d = *i;
 936                         output_bf_elem(d, pos, typebits, prefix);
 937                         pos += d->def.icon;
 938                 }
 939         }
 940 }
 941
 942 void CPPFile::output(BitField *sym, int pass, void *arg2)
 943 {
 944         switch (pass) {
 945                 case trav_nsdecl:
 946                         output_nsdecl(sym);
 947                         break;
 948
 949                 case trav_forward:
 950                         extra_newline();
 951                         file << indent << "union " << **sym->name << ";\n";
 952                         break;
 953
 954                 case trav_full: {
 955                         int bits = round_up_bits(sym->def.bits);
 956                         ns_in(sym);
 957
 958                         file << indent << "union ";
 959                         file << get_definition_name(sym) << " {\n";
 960                         downscope();
 961
 962                         file << indent << "struct {\n";
 963
 964                         downscope();
 965                         string nullprefix;
 966                         output_bf(sym, bits, bits, nullprefix);
 967                         upscope();
 968
 969                         file << indent << "};\n\n"
 970                              << indent << "uint" << bits << "_t _raw;\n\n"
 971                              << indent << **sym->name << "()\n"
 972                              << indent << "{\n"
 973                              << indent << "\t_raw = 0;\n"
 974                              << indent << "}\n\n"
 975                              << indent << **sym->name << "(uint" << bits << "_t _init)\n"
 976                              << indent << "{\n"
 977                              << indent << "\t_raw = _init;\n"
 978                              << indent << "}\n\n"
 979                              << indent << "operator uint" << bits << "_t()\n"
 980                              << indent << "{\n"
 981                              << indent << "\treturn _raw;\n"
 982                              << indent << "}\n";
 983
 984                         upscope();
 985                         file << indent << "};\n";
 986
 987                         ns_out(sym);
 988                         output_aliases_and_types(sym);
 989                         break;
 990                 }
 991
 992                 default:
 993                         BUG();
 994         }
 995 }
 996
 997
 998 void CPPFile::output(Enum *sym, int pass, void *arg2)
 999 {
1000         switch (pass) {
1001                 case trav_nsdecl:
1002                         /* no-op */
1003                         break;
1004
1005                 case trav_forward: {
1006                         bool do_ns_out = false;
1007
1008                         if (indent.indent_level == 0) {
1009                                 ns_in(sym);
1010                                 do_ns_out = true;
1011                         } else {
1012                                 extra_newline();
1013                         }
1014
1015                         file << indent << "struct " << **sym->name << " {\n";
1016                         downscope();
1017
1018                         for (Enum::entries_iterator i = sym->entries_begin();
1019                              i != sym->entries_end(); ++i)
1020                         {
1021                                 Datum *d = *i;
1022
1023                                 file << indent << "static const uint"
1024                                      << round_up_bits(sym->def.bits) << "_t "
1025                                      << **d->name << " = " << d->def.ucon << ";\n";
1026                         }
1027
1028                         file << '\n' << indent << "unsigned int _val;\n\n";
1029
1030                         file << indent << **sym->name << "()\n"
1031                              << indent << "{\n"
1032                              << indent << "\t_val = 0;\n"
1033                              << indent << "}\n\n";
1034
1035                         file << indent << **sym->name << "(unsigned int val)\n"
1036                              << indent << "{\n"
1037                              << indent << "\t_val = val;\n"
1038                              << indent << "}\n\n";
1039
1040                         file << indent << "operator unsigned int()\n"
1041                              << indent << "{\n"
1042                              << indent << "\treturn _val;\n"
1043                              << indent << "}\n\n";
1044
1045                         upscope();
1046                         file << indent << "};\n";
1047
1048                         if (do_ns_out)
1049                                 ns_out(sym);
1050
1051                         break;
1052                 }
1053
1054                 case trav_full:
1055                         // Nothing particular to do here, other than to make sure
1056                         // that trav_forward has happened (which will always need to
1057                         // be done here if it's not a nested type).
1058
1059                         output_pass(sym, trav_forward);
1060                         break;
1061
1062                 default:
1063                         BUG();
1064         }
1065 }
1066
1067 void CPPFile::output(BasicType *sym, int pass, void *arg2)
1068 {
1069         switch (pass) {
1070                 case trav_nsdecl:
1071                         /* no-op */
1072                         break;
1073
1074                 case trav_forward: {
1075                         bool do_ns_out = false;
1076
1077                         if (indent.indent_level == 0) {
1078                                 ns_in(sym);
1079                                 do_ns_out = true;
1080                         } else {
1081                                 extra_newline();
1082                         }
1083
1084                         file << indent << "typedef ";
1085                         assert(!is_array(sym->def));
1086                         cpp_output_type(file, sym->def, false);
1087                         file << **sym->name << ";\n";
1088
1089                         if (do_ns_out)
1090                                 ns_out(sym);
1091
1092                         break;
1093                 }
1094
1095                 case trav_full:
1096                         output_pass(sym, trav_forward);
1097                         break;
1098
1099                 default:
1100                         BUG();
1101         }
1102 }
1103
1104 void CPPFile::output(Alias *sym, int pass, void *arg2)
1105 {
1106         switch (pass) {
1107                 case trav_nsdecl:
1108                         /* no-op */
1109                         break;
1110
1111                 case trav_forward: {
1112                         bool do_ns_out = false;
1113
1114                         if (indent.indent_level == 0) {
1115                                 all_ns_in(sym);
1116                                 do_ns_out = true;
1117                         } else {
1118                                 extra_newline();
1119                         }
1120
1121                         const String *type = sym->get_concrete_sym()->get_fq_name("_ns")
1122                                                 ->flatten("::");
1123
1124                         file << indent << "typedef " << *type << " "
1125                              << **sym->name << ";\n";
1126
1127                         if (do_ns_out)
1128                                 all_ns_out(sym);
1129
1130                         break;
1131                 }
1132
1133                 case trav_full:
1134                         output_pass(sym, trav_forward);
1135                         break;
1136
1137                 default:
1138                         BUG();
1139         }
1140 }
1141
1142 void CPPFile::output(TypeDef *sym, int pass, void *arg2)
1143 {
1144         switch (pass) {
1145                 case trav_nsdecl:
1146                 case trav_forward:
1147                         /* no-op */
1148                         break;
1149
1150                 case trav_full: {
1151                         output_pass(sym->get_concrete_sym(), trav_forward);
1152
1153                         bool do_ns_out = false;
1154
1155                         if (indent.indent_level == 0) {
1156                                 all_ns_in(sym);
1157                                 do_ns_out = true;
1158                         } else {
1159                                 extra_newline();
1160                         }
1161
1162                         const String *type = sym->get_concrete_sym()->get_fq_name("_ns")
1163                                                 ->flatten("::");
1164
1165                         file << indent << "typedef " << *type << " "
1166                              << **sym->name << ";\n";
1167
1168                         if (do_ns_out)
1169                                 all_ns_out(sym);
1170
1171                         break;
1172                 }
1173
1174                 default:
1175                         BUG();
1176         }
1177 }
1178
1179 void CPPFile::output(Datum *sym, int pass, void *arg2)
1180 {
1181         assert(sym->def.flags.field.Const);
1182
1183         switch (pass) {
1184                 case trav_nsdecl:
1185                 case trav_forward:
1186                         /* no-op */
1187                         break;
1188
1189                 case trav_full: {
1190                         if (sym->type)
1191                                 declare_type_dependency(sym->type, false);
1192
1193                         bool do_ns_out = false;
1194
1195                         if (indent.indent_level == 0) {
1196                                 all_ns_in(sym);
1197                                 do_ns_out = true;
1198                         } else {
1199                                 extra_newline();
1200                         }
1201
1202                         file << indent << "static const ";
1203
1204                         assert(!is_array(sym->def.basictype));
1205
1206                         if (sym->type)
1207                                 cpp_output_type(file, sym->type, false, false);
1208                         else
1209                                 cpp_output_type(file, sym->def.basictype, false);
1210
1211                         file << **sym->name << " = ";
1212
1213                         CompiledBasicType *def;
1214                         if (sym->type) {
1215                                 Symbol *real_type = sym->type->get_concrete_sym();
1216                                 BasicType *bt = dynamic_cast<BasicType *>(real_type);
1217                                 assert(bt);
1218
1219                                 def = &bt->def;
1220                         } else {
1221                                 def = &sym->def.basictype;
1222                         }
1223
1224                         if (def->flags.field.Float) {
1225                                 file << sym->def.fcon;
1226                         } else if (def->flags.field.Bool) {
1227                                 if (sym->def.ucon == 0)
1228                                         file << "false";
1229                                 else
1230                                         file << "true";
1231                         } else {
1232                                 if (def->flags.field.Unsigned) {
1233                                         file << "0x" << std::hex << sym->def.ucon << std::dec << 'U';
1234                                 } else {
1235                                         file << sym->def.icon;
1236                                 }
1237
1238                                 file << "LL";
1239                         }
1240
1241                         file << ";\n";
1242
1243                         if (do_ns_out)
1244                                 all_ns_out(sym);
1245
1246                         break;
1247                 }
1248
1249                 default:
1250                         BUG();
1251         }
1252 }
1253
1254 void CPPBinding::output_root(UserNameSpace *ns, const char *dir)
1255 {
1256         delete new CPPFile(ns, dir);
1257 }