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