nsz Git - cparser/blob - ast.c

   1 #include <config.h>
   2
   3 #include "ast_t.h"
   4 #include "type_t.h"
   5
   6 #include <assert.h>
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include <ctype.h>
  10
  11 #include "adt/error.h"
  12
  13 struct obstack ast_obstack;
  14
  15 static FILE *out;
  16 static int   indent;
  17 static int   print_implicit_casts = 1;
  18
  19 static void print_statement(const statement_t *statement);
  20
  21 void change_indent(int delta)
  22 {
  23         indent += delta;
  24         assert(indent >= 0);
  25 }
  26
  27 void print_indent(void)
  28 {
  29         for(int i = 0; i < indent; ++i)
  30                 fprintf(out, "\t");
  31 }
  32
  33 static void print_const(const const_expression_t *cnst)
  34 {
  35         if(cnst->expression.datatype == NULL)
  36                 return;
  37
  38         if(is_type_integer(cnst->expression.datatype)) {
  39                 fprintf(out, "%lld", cnst->v.int_value);
  40         } else if(is_type_float(cnst->expression.datatype)) {
  41                 fprintf(out, "%Lf", cnst->v.float_value);
  42         }
  43 }
  44
  45 static void print_quoted_string(const string_t *const string)
  46 {
  47         fputc('"', out);
  48         for (const char *c = string->begin, *const end = c + string->size; c != end; ++c) {
  49                 switch(*c) {
  50                 case '\"':  fputs("\\\"", out); break;
  51                 case '\\':  fputs("\\\\", out); break;
  52                 case '\a':  fputs("\\a", out); break;
  53                 case '\b':  fputs("\\b", out); break;
  54                 case '\f':  fputs("\\f", out); break;
  55                 case '\n':  fputs("\\n", out); break;
  56                 case '\r':  fputs("\\r", out); break;
  57                 case '\t':  fputs("\\t", out); break;
  58                 case '\v':  fputs("\\v", out); break;
  59                 case '\?':  fputs("\\?", out); break;
  60                 default:
  61                         if(!isprint(*c)) {
  62                                 fprintf(out, "\\%03o", *c);
  63                                 break;
  64                         }
  65                         fputc(*c, out);
  66                         break;
  67                 }
  68         }
  69         fputc('"', out);
  70 }
  71
  72 static void print_string_literal(
  73                 const string_literal_expression_t *string_literal)
  74 {
  75         print_quoted_string(&string_literal->value);
  76 }
  77
  78 static void print_wide_string_literal(
  79         const wide_string_literal_expression_t *const wstr)
  80 {
  81         fputs("L\"", out);
  82         for (const wchar_rep_t *c   = wstr->value.begin,
  83                                *end = c + wstr->value.size;
  84              c != end; ++c) {
  85                 switch (*c) {
  86                         case L'\"':  fputs("\\\"", out); break;
  87                         case L'\\':  fputs("\\\\", out); break;
  88                         case L'\a':  fputs("\\a",  out); break;
  89                         case L'\b':  fputs("\\b",  out); break;
  90                         case L'\f':  fputs("\\f",  out); break;
  91                         case L'\n':  fputs("\\n",  out); break;
  92                         case L'\r':  fputs("\\r",  out); break;
  93                         case L'\t':  fputs("\\t",  out); break;
  94                         case L'\v':  fputs("\\v",  out); break;
  95                         case L'\?':  fputs("\\?",  out); break;
  96                         default: {
  97                                 const unsigned tc = *c;
  98                                 if (tc < 0x80U) {
  99                                         if (!isprint(*c))  {
 100                                                 fprintf(out, "\\%03o", (char)*c);
 101                                         } else {
 102                                                 fputc(*c, out);
 103                                         }
 104                                 } else if (tc < 0x800) {
 105                                         fputc(0xC0 | (tc >> 6),   out);
 106                                         fputc(0x80 | (tc & 0x3F), out);
 107                                 } else if (tc < 0x10000) {
 108                                         fputc(0xE0 | ( tc >> 12),         out);
 109                                         fputc(0x80 | ((tc >>  6) & 0x3F), out);
 110                                         fputc(0x80 | ( tc        & 0x3F), out);
 111                                 } else {
 112                                         fputc(0xF0 | ( tc >> 18),         out);
 113                                         fputc(0x80 | ((tc >> 12) & 0x3F), out);
 114                                         fputc(0x80 | ((tc >>  6) & 0x3F), out);
 115                                         fputc(0x80 | ( tc        & 0x3F), out);
 116                                 }
 117                         }
 118                 }
 119         }
 120         fputc('"', out);
 121 }
 122
 123 static void print_call_expression(const call_expression_t *call)
 124 {
 125         print_expression(call->function);
 126         fprintf(out, "(");
 127         call_argument_t *argument = call->arguments;
 128         int              first    = 1;
 129         while(argument != NULL) {
 130                 if(!first) {
 131                         fprintf(out, ", ");
 132                 } else {
 133                         first = 0;
 134                 }
 135                 print_expression(argument->expression);
 136
 137                 argument = argument->next;
 138         }
 139         fprintf(out, ")");
 140 }
 141
 142 static void print_binary_expression(const binary_expression_t *binexpr)
 143 {
 144         if(binexpr->expression.kind == EXPR_BINARY_BUILTIN_EXPECT) {
 145                 fputs("__builtin_expect(", out);
 146                 print_expression(binexpr->left);
 147                 fputs(", ", out);
 148                 print_expression(binexpr->right);
 149                 fputs(")", out);
 150                 return;
 151         }
 152
 153         fprintf(out, "(");
 154         print_expression(binexpr->left);
 155         fprintf(out, " ");
 156         switch(binexpr->expression.kind) {
 157         case EXPR_BINARY_COMMA:              fputs(",", out);     break;
 158         case EXPR_BINARY_ASSIGN:             fputs("=", out);     break;
 159         case EXPR_BINARY_ADD:                fputs("+", out);     break;
 160         case EXPR_BINARY_SUB:                fputs("-", out);     break;
 161         case EXPR_BINARY_MUL:                fputs("*", out);     break;
 162         case EXPR_BINARY_MOD:                fputs("%", out);     break;
 163         case EXPR_BINARY_DIV:                fputs("/", out);     break;
 164         case EXPR_BINARY_BITWISE_OR:         fputs("|", out);     break;
 165         case EXPR_BINARY_BITWISE_AND:        fputs("&", out);     break;
 166         case EXPR_BINARY_BITWISE_XOR:        fputs("^", out);     break;
 167         case EXPR_BINARY_LOGICAL_OR:         fputs("||", out);    break;
 168         case EXPR_BINARY_LOGICAL_AND:        fputs("&&", out);    break;
 169         case EXPR_BINARY_NOTEQUAL:           fputs("!=", out);    break;
 170         case EXPR_BINARY_EQUAL:              fputs("==", out);    break;
 171         case EXPR_BINARY_LESS:               fputs("<", out);     break;
 172         case EXPR_BINARY_LESSEQUAL:          fputs("<=", out);    break;
 173         case EXPR_BINARY_GREATER:            fputs(">", out);     break;
 174         case EXPR_BINARY_GREATEREQUAL:       fputs(">=", out);    break;
 175         case EXPR_BINARY_SHIFTLEFT:          fputs("<<", out);    break;
 176         case EXPR_BINARY_SHIFTRIGHT:         fputs(">>", out);    break;
 177
 178         case EXPR_BINARY_ADD_ASSIGN:         fputs("+=", out);    break;
 179         case EXPR_BINARY_SUB_ASSIGN:         fputs("-=", out);    break;
 180         case EXPR_BINARY_MUL_ASSIGN:         fputs("*=", out);    break;
 181         case EXPR_BINARY_MOD_ASSIGN:         fputs("%=", out);    break;
 182         case EXPR_BINARY_DIV_ASSIGN:         fputs("/=", out);    break;
 183         case EXPR_BINARY_BITWISE_OR_ASSIGN:  fputs("|=", out);    break;
 184         case EXPR_BINARY_BITWISE_AND_ASSIGN: fputs("&=", out);    break;
 185         case EXPR_BINARY_BITWISE_XOR_ASSIGN: fputs("^=", out);    break;
 186         case EXPR_BINARY_SHIFTLEFT_ASSIGN:   fputs("<<=", out);   break;
 187         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:  fputs(">>=", out);   break;
 188         default: panic("invalid binexpression found");
 189         }
 190         fprintf(out, " ");
 191         print_expression(binexpr->right);
 192         fprintf(out, ")");
 193 }
 194
 195 static void print_unary_expression(const unary_expression_t *unexpr)
 196 {
 197         switch(unexpr->expression.kind) {
 198         case EXPR_UNARY_NEGATE:           fputs("-", out);  break;
 199         case EXPR_UNARY_PLUS:             fputs("+", out);  break;
 200         case EXPR_UNARY_NOT:              fputs("!", out);  break;
 201         case EXPR_UNARY_BITWISE_NEGATE:   fputs("~", out);  break;
 202         case EXPR_UNARY_PREFIX_INCREMENT: fputs("++", out); break;
 203         case EXPR_UNARY_PREFIX_DECREMENT: fputs("--", out); break;
 204         case EXPR_UNARY_DEREFERENCE:      fputs("*", out);  break;
 205         case EXPR_UNARY_TAKE_ADDRESS:     fputs("&", out);  break;
 206
 207         case EXPR_UNARY_BITFIELD_EXTRACT:
 208                 print_expression(unexpr->value);
 209                 return;
 210
 211         case EXPR_UNARY_POSTFIX_INCREMENT:
 212                 fputs("(", out);
 213                 print_expression(unexpr->value);
 214                 fputs(")", out);
 215                 fputs("++", out);
 216                 return;
 217         case EXPR_UNARY_POSTFIX_DECREMENT:
 218                 fputs("(", out);
 219                 print_expression(unexpr->value);
 220                 fputs(")", out);
 221                 fputs("--", out);
 222                 return;
 223         case EXPR_UNARY_CAST_IMPLICIT:
 224                 if(!print_implicit_casts) {
 225                         print_expression(unexpr->value);
 226                         return;
 227                 }
 228                 /* fallthrough */
 229         case EXPR_UNARY_CAST:
 230                 fputs("(", out);
 231                 print_type(unexpr->expression.datatype);
 232                 fputs(")", out);
 233                 break;
 234         case EXPR_UNARY_ASSUME:
 235                 fputs("__assume", out);
 236                 break;
 237         default:
 238                 panic("invalid unary expression found");
 239         }
 240         fputs("(", out);
 241         print_expression(unexpr->value);
 242         fputs(")", out);
 243 }
 244
 245 static void print_reference_expression(const reference_expression_t *ref)
 246 {
 247         fprintf(out, "%s", ref->declaration->symbol->string);
 248 }
 249
 250 static void print_array_expression(const array_access_expression_t *expression)
 251 {
 252         if(!expression->flipped) {
 253                 fputs("(", out);
 254                 print_expression(expression->array_ref);
 255                 fputs(")[", out);
 256                 print_expression(expression->index);
 257                 fputs("]", out);
 258         } else {
 259                 fputs("(", out);
 260                 print_expression(expression->index);
 261                 fputs(")[", out);
 262                 print_expression(expression->array_ref);
 263                 fputs("]", out);
 264         }
 265 }
 266
 267 static void print_typeprop_expression(const typeprop_expression_t *expression)
 268 {
 269         if (expression->expression.kind == EXPR_SIZEOF) {
 270                 fputs("sizeof", out);
 271         } else {
 272                 assert(expression->expression.kind == EXPR_ALIGNOF);
 273                 fputs("__alignof__", out);
 274         }
 275         if(expression->tp_expression != NULL) {
 276                 fputc('(', out);
 277                 print_expression(expression->tp_expression);
 278                 fputc(')', out);
 279         } else {
 280                 fputc('(', out);
 281                 print_type(expression->type);
 282                 fputc(')', out);
 283         }
 284 }
 285
 286 static void print_builtin_symbol(const builtin_symbol_expression_t *expression)
 287 {
 288         fputs(expression->symbol->string, out);
 289 }
 290
 291 static void print_builtin_constant(const builtin_constant_expression_t *expression)
 292 {
 293         fputs("__builtin_constant_p(", out);
 294         print_expression(expression->value);
 295         fputc(')', out);
 296 }
 297
 298 static void print_builtin_prefetch(const builtin_prefetch_expression_t *expression)
 299 {
 300         fputs("__builtin_prefetch(", out);
 301         print_expression(expression->adr);
 302         if (expression->rw) {
 303                 fputc(',', out);
 304                 print_expression(expression->rw);
 305         }
 306         if (expression->locality) {
 307                 fputc(',', out);
 308                 print_expression(expression->locality);
 309         }
 310         fputc(')', out);
 311 }
 312
 313 static void print_conditional(const conditional_expression_t *expression)
 314 {
 315         fputs("(", out);
 316         print_expression(expression->condition);
 317         fputs(" ? ", out);
 318         print_expression(expression->true_expression);
 319         fputs(" : ", out);
 320         print_expression(expression->false_expression);
 321         fputs(")", out);
 322 }
 323
 324 static void print_va_start(const va_start_expression_t *const expression)
 325 {
 326         fputs("__builtin_va_start(", out);
 327         print_expression(expression->ap);
 328         fputs(", ", out);
 329         fputs(expression->parameter->symbol->string, out);
 330         fputs(")", out);
 331 }
 332
 333 static void print_va_arg(const va_arg_expression_t *expression)
 334 {
 335         fputs("__builtin_va_arg(", out);
 336         print_expression(expression->ap);
 337         fputs(", ", out);
 338         print_type(expression->expression.datatype);
 339         fputs(")", out);
 340 }
 341
 342 static void print_select(const select_expression_t *expression)
 343 {
 344         print_expression(expression->compound);
 345         if(expression->compound->base.datatype == NULL ||
 346                         expression->compound->base.datatype->kind == TYPE_POINTER) {
 347                 fputs("->", out);
 348         } else {
 349                 fputc('.', out);
 350         }
 351         fputs(expression->symbol->string, out);
 352 }
 353
 354 static void print_classify_type_expression(
 355         const classify_type_expression_t *const expr)
 356 {
 357         fputs("__builtin_classify_type(", out);
 358         print_expression(expr->type_expression);
 359         fputc(')', out);
 360 }
 361
 362 static void print_designator(const designator_t *designator)
 363 {
 364         fputs(designator->symbol->string, out);
 365         for (designator = designator->next; designator != NULL; designator = designator->next) {
 366                 if (designator->array_access) {
 367                         fputc('[', out);
 368                         print_expression(designator->array_access);
 369                         fputc(']', out);
 370                 } else {
 371                         fputc('.', out);
 372                         fputs(designator->symbol->string, out);
 373                 }
 374         }
 375 }
 376
 377 static void print_offsetof_expression(const offsetof_expression_t *expression)
 378 {
 379         fputs("__builtin_offsetof", out);
 380         fputc('(', out);
 381         print_type(expression->type);
 382         fputc(',', out);
 383         print_designator(expression->designator);
 384         fputc(')', out);
 385 }
 386
 387 static void print_statement_expression(const statement_expression_t *expression)
 388 {
 389         fputc('(', out);
 390         print_statement(expression->statement);
 391         fputc(')', out);
 392 }
 393
 394 void print_expression(const expression_t *expression)
 395 {
 396         switch(expression->kind) {
 397         case EXPR_UNKNOWN:
 398         case EXPR_INVALID:
 399                 fprintf(out, "*invalid expression*");
 400                 break;
 401         case EXPR_CONST:
 402                 print_const(&expression->conste);
 403                 break;
 404         case EXPR_FUNCTION:
 405         case EXPR_PRETTY_FUNCTION:
 406         case EXPR_STRING_LITERAL:
 407                 print_string_literal(&expression->string);
 408                 break;
 409         case EXPR_WIDE_STRING_LITERAL:
 410                 print_wide_string_literal(&expression->wide_string);
 411                 break;
 412         case EXPR_CALL:
 413                 print_call_expression(&expression->call);
 414                 break;
 415         EXPR_BINARY_CASES
 416                 print_binary_expression(&expression->binary);
 417                 break;
 418         case EXPR_REFERENCE:
 419                 print_reference_expression(&expression->reference);
 420                 break;
 421         case EXPR_ARRAY_ACCESS:
 422                 print_array_expression(&expression->array_access);
 423                 break;
 424         EXPR_UNARY_CASES
 425                 print_unary_expression(&expression->unary);
 426                 break;
 427         case EXPR_SIZEOF:
 428         case EXPR_ALIGNOF:
 429                 print_typeprop_expression(&expression->typeprop);
 430                 break;
 431         case EXPR_BUILTIN_SYMBOL:
 432                 print_builtin_symbol(&expression->builtin_symbol);
 433                 break;
 434         case EXPR_BUILTIN_CONSTANT_P:
 435                 print_builtin_constant(&expression->builtin_constant);
 436                 break;
 437         case EXPR_BUILTIN_PREFETCH:
 438                 print_builtin_prefetch(&expression->builtin_prefetch);
 439                 break;
 440         case EXPR_CONDITIONAL:
 441                 print_conditional(&expression->conditional);
 442                 break;
 443         case EXPR_VA_START:
 444                 print_va_start(&expression->va_starte);
 445                 break;
 446         case EXPR_VA_ARG:
 447                 print_va_arg(&expression->va_arge);
 448                 break;
 449         case EXPR_SELECT:
 450                 print_select(&expression->select);
 451                 break;
 452         case EXPR_CLASSIFY_TYPE:
 453                 print_classify_type_expression(&expression->classify_type);
 454                 break;
 455         case EXPR_OFFSETOF:
 456                 print_offsetof_expression(&expression->offsetofe);
 457                 break;
 458         case EXPR_STATEMENT:
 459                 print_statement_expression(&expression->statement);
 460                 break;
 461
 462         default:
 463                 /* TODO */
 464                 fprintf(out, "some expression of type %d", (int) expression->kind);
 465                 break;
 466         }
 467 }
 468
 469 static void print_compound_statement(const compound_statement_t *block)
 470 {
 471         fputs("{\n", out);
 472         indent++;
 473
 474         statement_t *statement = block->statements;
 475         while(statement != NULL) {
 476                 print_indent();
 477                 print_statement(statement);
 478
 479                 statement = statement->base.next;
 480         }
 481         indent--;
 482         print_indent();
 483         fputs("}\n", out);
 484 }
 485
 486 static void print_return_statement(const return_statement_t *statement)
 487 {
 488         fprintf(out, "return ");
 489         if(statement->return_value != NULL)
 490                 print_expression(statement->return_value);
 491         fputs(";\n", out);
 492 }
 493
 494 static void print_expression_statement(const expression_statement_t *statement)
 495 {
 496         print_expression(statement->expression);
 497         fputs(";\n", out);
 498 }
 499
 500 static void print_goto_statement(const goto_statement_t *statement)
 501 {
 502         fprintf(out, "goto ");
 503         fputs(statement->label->symbol->string, out);
 504         fprintf(stderr, "(%p)", (void*) statement->label);
 505         fputs(";\n", out);
 506 }
 507
 508 static void print_label_statement(const label_statement_t *statement)
 509 {
 510         fprintf(stderr, "(%p)", (void*) statement->label);
 511         fprintf(out, "%s:\n", statement->label->symbol->string);
 512         if(statement->label_statement != NULL) {
 513                 print_statement(statement->label_statement);
 514         }
 515 }
 516
 517 static void print_if_statement(const if_statement_t *statement)
 518 {
 519         fputs("if(", out);
 520         print_expression(statement->condition);
 521         fputs(") ", out);
 522         if(statement->true_statement != NULL) {
 523                 print_statement(statement->true_statement);
 524         }
 525
 526         if(statement->false_statement != NULL) {
 527                 print_indent();
 528                 fputs("else ", out);
 529                 print_statement(statement->false_statement);
 530         }
 531 }
 532
 533 static void print_switch_statement(const switch_statement_t *statement)
 534 {
 535         fputs("switch(", out);
 536         print_expression(statement->expression);
 537         fputs(") ", out);
 538         print_statement(statement->body);
 539 }
 540
 541 static void print_case_label(const case_label_statement_t *statement)
 542 {
 543         if(statement->expression == NULL) {
 544                 fputs("default:\n", out);
 545         } else {
 546                 fputs("case ", out);
 547                 print_expression(statement->expression);
 548                 fputs(":\n", out);
 549         }
 550         print_statement(statement->label_statement);
 551 }
 552
 553 static void print_declaration_statement(
 554                 const declaration_statement_t *statement)
 555 {
 556         int first = 1;
 557         declaration_t *declaration = statement->declarations_begin;
 558         for( ; declaration != statement->declarations_end->next;
 559                declaration = declaration->next) {
 560                 if(!first) {
 561                         print_indent();
 562                 } else {
 563                         first = 0;
 564                 }
 565                 print_declaration(declaration);
 566                 fputc('\n', out);
 567         }
 568 }
 569
 570 static void print_while_statement(const while_statement_t *statement)
 571 {
 572         fputs("while(", out);
 573         print_expression(statement->condition);
 574         fputs(") ", out);
 575         print_statement(statement->body);
 576 }
 577
 578 static void print_do_while_statement(const do_while_statement_t *statement)
 579 {
 580         fputs("do ", out);
 581         print_statement(statement->body);
 582         print_indent();
 583         fputs("while(", out);
 584         print_expression(statement->condition);
 585         fputs(");\n", out);
 586 }
 587
 588 static void print_for_statement(const for_statement_t *statement)
 589 {
 590         fputs("for(", out);
 591         if(statement->scope.declarations != NULL) {
 592                 assert(statement->initialisation == NULL);
 593                 print_declaration(statement->scope.declarations);
 594                 if(statement->scope.declarations->next != NULL) {
 595                         panic("multiple declarations in for statement not supported yet");
 596                 }
 597                 fputc(' ', out);
 598         } else {
 599                 if(statement->initialisation) {
 600                         print_expression(statement->initialisation);
 601                 }
 602                 fputs("; ", out);
 603         }
 604         if(statement->condition != NULL) {
 605                 print_expression(statement->condition);
 606         }
 607         fputs("; ", out);
 608         if(statement->step != NULL) {
 609                 print_expression(statement->step);
 610         }
 611         fputs(")", out);
 612         print_statement(statement->body);
 613 }
 614
 615 static void print_asm_constraints(asm_constraint_t *constraints)
 616 {
 617         asm_constraint_t *constraint = constraints;
 618         for( ; constraint != NULL; constraint = constraint->next) {
 619                 if(constraint != constraints)
 620                         fputs(", ", out);
 621
 622                 if(constraint->symbol) {
 623                         fprintf(out, "[%s] ", constraint->symbol->string);
 624                 }
 625                 print_quoted_string(&constraint->constraints);
 626                 fputs(" (", out);
 627                 print_expression(constraint->expression);
 628                 fputs(")", out);
 629         }
 630 }
 631
 632 static void print_asm_clobbers(asm_clobber_t *clobbers)
 633 {
 634         asm_clobber_t *clobber = clobbers;
 635         for( ; clobber != NULL; clobber = clobber->next) {
 636                 if(clobber != clobbers)
 637                         fputs(", ", out);
 638
 639                 print_quoted_string(&clobber->clobber);
 640         }
 641 }
 642
 643 static void print_asm_statement(const asm_statement_t *statement)
 644 {
 645         fputs("asm ", out);
 646         if(statement->is_volatile) {
 647                 fputs("volatile ", out);
 648         }
 649         fputs("(", out);
 650         print_quoted_string(&statement->asm_text);
 651         if(statement->inputs == NULL && statement->outputs == NULL
 652                         && statement->clobbers == NULL)
 653                 goto end_of_print_asm_statement;
 654
 655         fputs(" : ", out);
 656         print_asm_constraints(statement->inputs);
 657         if(statement->outputs == NULL && statement->clobbers == NULL)
 658                 goto end_of_print_asm_statement;
 659
 660         fputs(" : ", out);
 661         print_asm_constraints(statement->outputs);
 662         if(statement->clobbers == NULL)
 663                 goto end_of_print_asm_statement;
 664
 665         fputs(" : ", out);
 666         print_asm_clobbers(statement->clobbers);
 667
 668 end_of_print_asm_statement:
 669         fputs(");\n", out);
 670 }
 671
 672 void print_statement(const statement_t *statement)
 673 {
 674         switch(statement->kind) {
 675         case STATEMENT_COMPOUND:
 676                 print_compound_statement(&statement->compound);
 677                 break;
 678         case STATEMENT_RETURN:
 679                 print_return_statement(&statement->returns);
 680                 break;
 681         case STATEMENT_EXPRESSION:
 682                 print_expression_statement(&statement->expression);
 683                 break;
 684         case STATEMENT_LABEL:
 685                 print_label_statement(&statement->label);
 686                 break;
 687         case STATEMENT_GOTO:
 688                 print_goto_statement(&statement->gotos);
 689                 break;
 690         case STATEMENT_CONTINUE:
 691                 fputs("continue;\n", out);
 692                 break;
 693         case STATEMENT_BREAK:
 694                 fputs("break;\n", out);
 695                 break;
 696         case STATEMENT_IF:
 697                 print_if_statement(&statement->ifs);
 698                 break;
 699         case STATEMENT_SWITCH:
 700                 print_switch_statement(&statement->switchs);
 701                 break;
 702         case STATEMENT_CASE_LABEL:
 703                 print_case_label(&statement->case_label);
 704                 break;
 705         case STATEMENT_DECLARATION:
 706                 print_declaration_statement(&statement->declaration);
 707                 break;
 708         case STATEMENT_WHILE:
 709                 print_while_statement(&statement->whiles);
 710                 break;
 711         case STATEMENT_DO_WHILE:
 712                 print_do_while_statement(&statement->do_while);
 713                 break;
 714         case STATEMENT_FOR:
 715                 print_for_statement(&statement->fors);
 716                 break;
 717         case STATEMENT_ASM:
 718                 print_asm_statement(&statement->asms);
 719                 break;
 720         case STATEMENT_INVALID:
 721                 fprintf(out, "*invalid statement*");
 722                 break;
 723         }
 724 }
 725
 726 static void print_storage_class(unsigned storage_class)
 727 {
 728         switch((storage_class_tag_t) storage_class) {
 729         case STORAGE_CLASS_ENUM_ENTRY:
 730         case STORAGE_CLASS_NONE:
 731                 break;
 732         case STORAGE_CLASS_TYPEDEF:       fputs("typedef ",        out); break;
 733         case STORAGE_CLASS_EXTERN:        fputs("extern ",         out); break;
 734         case STORAGE_CLASS_STATIC:        fputs("static ",         out); break;
 735         case STORAGE_CLASS_AUTO:          fputs("auto ",           out); break;
 736         case STORAGE_CLASS_REGISTER:      fputs("register ",       out); break;
 737         case STORAGE_CLASS_THREAD:        fputs("__thread",        out); break;
 738         case STORAGE_CLASS_THREAD_EXTERN: fputs("extern __thread", out); break;
 739         case STORAGE_CLASS_THREAD_STATIC: fputs("static __thread", out); break;
 740         }
 741 }
 742
 743 void print_initializer(const initializer_t *initializer)
 744 {
 745         if(initializer->kind == INITIALIZER_VALUE) {
 746                 const initializer_value_t *value = &initializer->value;
 747                 print_expression(value->value);
 748                 return;
 749         }
 750
 751         assert(initializer->kind == INITIALIZER_LIST);
 752         fputs("{ ", out);
 753         const initializer_list_t *list = &initializer->list;
 754
 755         for(size_t i = 0 ; i < list->len; ++i) {
 756                 if(i > 0) {
 757                         fputs(", ", out);
 758                 }
 759                 print_initializer(list->initializers[i]);
 760         }
 761         fputs("}", out);
 762 }
 763
 764 static void print_normal_declaration(const declaration_t *declaration)
 765 {
 766         print_storage_class(declaration->storage_class);
 767         if(declaration->is_inline) {
 768                 if (declaration->modifiers & DM_FORCEINLINE)
 769                         fputs("__forceinline ", out);
 770                 else
 771                         fputs("inline ", out);
 772         }
 773         print_type_ext(declaration->type, declaration->symbol,
 774                        &declaration->scope);
 775
 776         if(declaration->type->kind == TYPE_FUNCTION) {
 777                 if(declaration->init.statement != NULL) {
 778                         fputs("\n", out);
 779                         print_statement(declaration->init.statement);
 780                         return;
 781                 }
 782         } else if(declaration->init.initializer != NULL) {
 783                 fputs(" = ", out);
 784                 print_initializer(declaration->init.initializer);
 785         }
 786         fputc(';', out);
 787 }
 788
 789 void print_declaration(const declaration_t *declaration)
 790 {
 791         if(declaration->namespc != NAMESPACE_NORMAL &&
 792                         declaration->symbol == NULL)
 793                 return;
 794
 795         switch(declaration->namespc) {
 796         case NAMESPACE_NORMAL:
 797                 print_normal_declaration(declaration);
 798                 break;
 799         case NAMESPACE_STRUCT:
 800                 fputs("struct ", out);
 801                 fputs(declaration->symbol->string, out);
 802                 fputc(' ', out);
 803                 print_compound_definition(declaration);
 804                 fputc(';', out);
 805                 break;
 806         case NAMESPACE_UNION:
 807                 fputs("union ", out);
 808                 fputs(declaration->symbol->string, out);
 809                 fputc(' ', out);
 810                 print_compound_definition(declaration);
 811                 fputc(';', out);
 812                 break;
 813         case NAMESPACE_ENUM:
 814                 fputs("enum ", out);
 815                 fputs(declaration->symbol->string, out);
 816                 fputc(' ', out);
 817                 print_enum_definition(declaration);
 818                 fputc(';', out);
 819                 break;
 820         }
 821 }
 822
 823 void print_ast(const translation_unit_t *unit)
 824 {
 825         inc_type_visited();
 826
 827         declaration_t *declaration = unit->scope.declarations;
 828         for( ; declaration != NULL; declaration = declaration->next) {
 829                 if(declaration->storage_class == STORAGE_CLASS_ENUM_ENTRY)
 830                         continue;
 831                 if(declaration->namespc != NAMESPACE_NORMAL &&
 832                                 declaration->symbol == NULL)
 833                         continue;
 834
 835                 print_indent();
 836                 print_declaration(declaration);
 837                 fputc('\n', out);
 838         }
 839 }
 840
 841 bool is_constant_expression(const expression_t *expression)
 842 {
 843         switch(expression->kind) {
 844
 845         case EXPR_CONST:
 846         case EXPR_STRING_LITERAL:
 847         case EXPR_WIDE_STRING_LITERAL:
 848         case EXPR_SIZEOF:
 849         case EXPR_CLASSIFY_TYPE:
 850         case EXPR_FUNCTION:
 851         case EXPR_PRETTY_FUNCTION:
 852         case EXPR_OFFSETOF:
 853         case EXPR_ALIGNOF:
 854         case EXPR_BUILTIN_CONSTANT_P:
 855                 return true;
 856
 857         case EXPR_BUILTIN_SYMBOL:
 858         case EXPR_BUILTIN_PREFETCH:
 859         case EXPR_CALL:
 860         case EXPR_SELECT:
 861         case EXPR_VA_START:
 862         case EXPR_VA_ARG:
 863         case EXPR_STATEMENT:
 864         case EXPR_UNARY_POSTFIX_INCREMENT:
 865         case EXPR_UNARY_POSTFIX_DECREMENT:
 866         case EXPR_UNARY_PREFIX_INCREMENT:
 867         case EXPR_UNARY_PREFIX_DECREMENT:
 868         case EXPR_UNARY_BITFIELD_EXTRACT:
 869         case EXPR_UNARY_ASSUME: /* has VOID type */
 870         case EXPR_BINARY_ASSIGN:
 871         case EXPR_BINARY_MUL_ASSIGN:
 872         case EXPR_BINARY_DIV_ASSIGN:
 873         case EXPR_BINARY_MOD_ASSIGN:
 874         case EXPR_BINARY_ADD_ASSIGN:
 875         case EXPR_BINARY_SUB_ASSIGN:
 876         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
 877         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
 878         case EXPR_BINARY_BITWISE_AND_ASSIGN:
 879         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
 880         case EXPR_BINARY_BITWISE_OR_ASSIGN:
 881         case EXPR_BINARY_COMMA:
 882                 return false;
 883
 884         case EXPR_UNARY_NEGATE:
 885         case EXPR_UNARY_PLUS:
 886         case EXPR_UNARY_BITWISE_NEGATE:
 887         case EXPR_UNARY_NOT:
 888         case EXPR_UNARY_DEREFERENCE:
 889         case EXPR_UNARY_TAKE_ADDRESS:
 890         case EXPR_UNARY_CAST:
 891         case EXPR_UNARY_CAST_IMPLICIT:
 892                 return is_constant_expression(expression->unary.value);
 893
 894         case EXPR_BINARY_ADD:
 895         case EXPR_BINARY_SUB:
 896         case EXPR_BINARY_MUL:
 897         case EXPR_BINARY_DIV:
 898         case EXPR_BINARY_MOD:
 899         case EXPR_BINARY_EQUAL:
 900         case EXPR_BINARY_NOTEQUAL:
 901         case EXPR_BINARY_LESS:
 902         case EXPR_BINARY_LESSEQUAL:
 903         case EXPR_BINARY_GREATER:
 904         case EXPR_BINARY_GREATEREQUAL:
 905         case EXPR_BINARY_BITWISE_AND:
 906         case EXPR_BINARY_BITWISE_OR:
 907         case EXPR_BINARY_BITWISE_XOR:
 908         case EXPR_BINARY_LOGICAL_AND:
 909         case EXPR_BINARY_LOGICAL_OR:
 910         case EXPR_BINARY_SHIFTLEFT:
 911         case EXPR_BINARY_SHIFTRIGHT:
 912         case EXPR_BINARY_BUILTIN_EXPECT:
 913         case EXPR_BINARY_ISGREATER:
 914         case EXPR_BINARY_ISGREATEREQUAL:
 915         case EXPR_BINARY_ISLESS:
 916         case EXPR_BINARY_ISLESSEQUAL:
 917         case EXPR_BINARY_ISLESSGREATER:
 918         case EXPR_BINARY_ISUNORDERED:
 919                 return is_constant_expression(expression->binary.left)
 920                         && is_constant_expression(expression->binary.right);
 921
 922         case EXPR_CONDITIONAL:
 923                 /* TODO: not correct, we only have to test expressions which are
 924                  * evaluated, which means either the true or false part might be not
 925                  * constant */
 926                 return is_constant_expression(expression->conditional.condition)
 927                         && is_constant_expression(expression->conditional.true_expression)
 928                         && is_constant_expression(expression->conditional.false_expression);
 929
 930         case EXPR_ARRAY_ACCESS:
 931                 return is_constant_expression(expression->array_access.array_ref)
 932                         && is_constant_expression(expression->array_access.index);
 933
 934         case EXPR_REFERENCE: {
 935                 declaration_t *declaration = expression->reference.declaration;
 936                 if(declaration->storage_class == STORAGE_CLASS_ENUM_ENTRY)
 937                         return true;
 938
 939                 return false;
 940         }
 941
 942         case EXPR_UNKNOWN:
 943         case EXPR_INVALID:
 944                 break;
 945         }
 946         panic("invalid expression found (is constant expression)");
 947 }
 948
 949
 950 void init_ast(void)
 951 {
 952         obstack_init(&ast_obstack);
 953 }
 954
 955 void exit_ast(void)
 956 {
 957         obstack_free(&ast_obstack, NULL);
 958 }
 959
 960 void ast_set_output(FILE *stream)
 961 {
 962         out = stream;
 963         type_set_output(stream);
 964 }
 965
 966 void* (allocate_ast) (size_t size)
 967 {
 968         return _allocate_ast(size);
 969 }