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_builtin_symbol(const builtin_symbol_expression_t *expression)
 274 {
 275         fputs(expression->symbol->string, out);
 276 }
 277
 278 static void print_conditional(const conditional_expression_t *expression)
 279 {
 280         fputs("(", out);
 281         print_expression(expression->condition);
 282         fputs(" ? ", out);
 283         print_expression(expression->true_expression);
 284         fputs(" : ", out);
 285         print_expression(expression->false_expression);
 286         fputs(")", out);
 287 }
 288
 289 static void print_va_start(const va_start_expression_t *const expression)
 290 {
 291         fputs("__builtin_va_start(", out);
 292         print_expression(expression->ap);
 293         fputs(", ", out);
 294         fputs(expression->parameter->symbol->string, out);
 295         fputs(")", out);
 296 }
 297
 298 static void print_va_arg(const va_arg_expression_t *expression)
 299 {
 300         fputs("__builtin_va_arg(", out);
 301         print_expression(expression->ap);
 302         fputs(", ", out);
 303         print_type(expression->expression.datatype);
 304         fputs(")", out);
 305 }
 306
 307 static void print_select(const select_expression_t *expression)
 308 {
 309         print_expression(expression->compound);
 310         if(expression->compound->base.datatype == NULL ||
 311                         expression->compound->base.datatype->kind == TYPE_POINTER) {
 312                 fputs("->", out);
 313         } else {
 314                 fputc('.', out);
 315         }
 316         fputs(expression->symbol->string, out);
 317 }
 318
 319 static void print_classify_type_expression(
 320         const classify_type_expression_t *const expr)
 321 {
 322         fputs("__builtin_classify_type(", out);
 323         print_expression(expr->type_expression);
 324         fputc(')', out);
 325 }
 326
 327 static void print_designator(const designator_t *designator)
 328 {
 329         fputs(designator->symbol->string, out);
 330         for (designator = designator->next; designator != NULL; designator = designator->next) {
 331                 if (designator->array_access) {
 332                         fputc('[', out);
 333                         print_expression(designator->array_access);
 334                         fputc(']', out);
 335                 } else {
 336                         fputc('.', out);
 337                         fputs(designator->symbol->string, out);
 338                 }
 339         }
 340 }
 341
 342 static void print_offsetof_expression(const offsetof_expression_t *expression)
 343 {
 344         fputs("__builtin_offsetof", out);
 345         fputc('(', out);
 346         print_type(expression->type);
 347         fputc(',', out);
 348         print_designator(expression->designator);
 349         fputc(')', out);
 350 }
 351
 352 static void print_statement_expression(const statement_expression_t *expression)
 353 {
 354         fputc('(', out);
 355         print_statement(expression->statement);
 356         fputc(')', out);
 357 }
 358
 359 void print_expression(const expression_t *expression)
 360 {
 361         switch(expression->kind) {
 362         case EXPR_UNKNOWN:
 363         case EXPR_INVALID:
 364                 fprintf(out, "*invalid expression*");
 365                 break;
 366         case EXPR_CONST:
 367                 print_const(&expression->conste);
 368                 break;
 369         case EXPR_FUNCTION:
 370         case EXPR_PRETTY_FUNCTION:
 371         case EXPR_STRING_LITERAL:
 372                 print_string_literal(&expression->string);
 373                 break;
 374         case EXPR_WIDE_STRING_LITERAL:
 375                 print_wide_string_literal(&expression->wide_string);
 376                 break;
 377         case EXPR_CALL:
 378                 print_call_expression(&expression->call);
 379                 break;
 380         EXPR_BINARY_CASES
 381                 print_binary_expression(&expression->binary);
 382                 break;
 383         case EXPR_REFERENCE:
 384                 print_reference_expression(&expression->reference);
 385                 break;
 386         case EXPR_ARRAY_ACCESS:
 387                 print_array_expression(&expression->array_access);
 388                 break;
 389         EXPR_UNARY_CASES
 390                 print_unary_expression(&expression->unary);
 391                 break;
 392         case EXPR_SIZEOF:
 393                 print_sizeof_expression(&expression->sizeofe);
 394                 break;
 395         case EXPR_BUILTIN_SYMBOL:
 396                 print_builtin_symbol(&expression->builtin_symbol);
 397                 break;
 398         case EXPR_CONDITIONAL:
 399                 print_conditional(&expression->conditional);
 400                 break;
 401         case EXPR_VA_START:
 402                 print_va_start(&expression->va_starte);
 403                 break;
 404         case EXPR_VA_ARG:
 405                 print_va_arg(&expression->va_arge);
 406                 break;
 407         case EXPR_SELECT:
 408                 print_select(&expression->select);
 409                 break;
 410         case EXPR_CLASSIFY_TYPE:
 411                 print_classify_type_expression(&expression->classify_type);
 412                 break;
 413         case EXPR_OFFSETOF:
 414                 print_offsetof_expression(&expression->offsetofe);
 415                 break;
 416         case EXPR_STATEMENT:
 417                 print_statement_expression(&expression->statement);
 418                 break;
 419
 420         default:
 421                 /* TODO */
 422                 fprintf(out, "some expression of type %d", (int) expression->kind);
 423                 break;
 424         }
 425 }
 426
 427 static void print_compound_statement(const compound_statement_t *block)
 428 {
 429         fputs("{\n", out);
 430         indent++;
 431
 432         statement_t *statement = block->statements;
 433         while(statement != NULL) {
 434                 print_indent();
 435                 print_statement(statement);
 436
 437                 statement = statement->base.next;
 438         }
 439         indent--;
 440         print_indent();
 441         fputs("}\n", out);
 442 }
 443
 444 static void print_return_statement(const return_statement_t *statement)
 445 {
 446         fprintf(out, "return ");
 447         if(statement->return_value != NULL)
 448                 print_expression(statement->return_value);
 449         fputs(";\n", out);
 450 }
 451
 452 static void print_expression_statement(const expression_statement_t *statement)
 453 {
 454         print_expression(statement->expression);
 455         fputs(";\n", out);
 456 }
 457
 458 static void print_goto_statement(const goto_statement_t *statement)
 459 {
 460         fprintf(out, "goto ");
 461         fputs(statement->label->symbol->string, out);
 462         fprintf(stderr, "(%p)", (void*) statement->label);
 463         fputs(";\n", out);
 464 }
 465
 466 static void print_label_statement(const label_statement_t *statement)
 467 {
 468         fprintf(stderr, "(%p)", (void*) statement->label);
 469         fprintf(out, "%s:\n", statement->label->symbol->string);
 470         if(statement->label_statement != NULL) {
 471                 print_statement(statement->label_statement);
 472         }
 473 }
 474
 475 static void print_if_statement(const if_statement_t *statement)
 476 {
 477         fputs("if(", out);
 478         print_expression(statement->condition);
 479         fputs(") ", out);
 480         if(statement->true_statement != NULL) {
 481                 print_statement(statement->true_statement);
 482         }
 483
 484         if(statement->false_statement != NULL) {
 485                 print_indent();
 486                 fputs("else ", out);
 487                 print_statement(statement->false_statement);
 488         }
 489 }
 490
 491 static void print_switch_statement(const switch_statement_t *statement)
 492 {
 493         fputs("switch(", out);
 494         print_expression(statement->expression);
 495         fputs(") ", out);
 496         print_statement(statement->body);
 497 }
 498
 499 static void print_case_label(const case_label_statement_t *statement)
 500 {
 501         if(statement->expression == NULL) {
 502                 fputs("default:\n", out);
 503         } else {
 504                 fputs("case ", out);
 505                 print_expression(statement->expression);
 506                 fputs(":\n", out);
 507         }
 508         print_statement(statement->label_statement);
 509 }
 510
 511 static void print_declaration_statement(
 512                 const declaration_statement_t *statement)
 513 {
 514         int first = 1;
 515         declaration_t *declaration = statement->declarations_begin;
 516         for( ; declaration != statement->declarations_end->next;
 517                declaration = declaration->next) {
 518                 if(!first) {
 519                         print_indent();
 520                 } else {
 521                         first = 0;
 522                 }
 523                 print_declaration(declaration);
 524                 fputc('\n', out);
 525         }
 526 }
 527
 528 static void print_while_statement(const while_statement_t *statement)
 529 {
 530         fputs("while(", out);
 531         print_expression(statement->condition);
 532         fputs(") ", out);
 533         print_statement(statement->body);
 534 }
 535
 536 static void print_do_while_statement(const do_while_statement_t *statement)
 537 {
 538         fputs("do ", out);
 539         print_statement(statement->body);
 540         print_indent();
 541         fputs("while(", out);
 542         print_expression(statement->condition);
 543         fputs(");\n", out);
 544 }
 545
 546 static void print_for_statement(const for_statement_t *statement)
 547 {
 548         fputs("for(", out);
 549         if(statement->context.declarations != NULL) {
 550                 assert(statement->initialisation == NULL);
 551                 print_declaration(statement->context.declarations);
 552                 if(statement->context.declarations->next != NULL) {
 553                         panic("multiple declarations in for statement not supported yet");
 554                 }
 555                 fputc(' ', out);
 556         } else {
 557                 if(statement->initialisation) {
 558                         print_expression(statement->initialisation);
 559                 }
 560                 fputs("; ", out);
 561         }
 562         if(statement->condition != NULL) {
 563                 print_expression(statement->condition);
 564         }
 565         fputs("; ", out);
 566         if(statement->step != NULL) {
 567                 print_expression(statement->step);
 568         }
 569         fputs(")", out);
 570         print_statement(statement->body);
 571 }
 572
 573 static void print_asm_constraints(asm_constraint_t *constraints)
 574 {
 575         asm_constraint_t *constraint = constraints;
 576         for( ; constraint != NULL; constraint = constraint->next) {
 577                 if(constraint != constraints)
 578                         fputs(", ", out);
 579
 580                 if(constraint->symbol) {
 581                         fprintf(out, "[%s] ", constraint->symbol->string);
 582                 }
 583                 print_quoted_string(constraint->constraints);
 584                 fputs(" (", out);
 585                 print_expression(constraint->expression);
 586                 fputs(")", out);
 587         }
 588 }
 589
 590 static void print_asm_clobbers(asm_clobber_t *clobbers)
 591 {
 592         asm_clobber_t *clobber = clobbers;
 593         for( ; clobber != NULL; clobber = clobber->next) {
 594                 if(clobber != clobbers)
 595                         fputs(", ", out);
 596
 597                 print_quoted_string(clobber->clobber);
 598         }
 599 }
 600
 601 static void print_asm_statement(const asm_statement_t *statement)
 602 {
 603         fputs("asm ", out);
 604         if(statement->is_volatile) {
 605                 fputs("volatile ", out);
 606         }
 607         fputs("(", out);
 608         print_quoted_string(statement->asm_text);
 609         if(statement->inputs == NULL && statement->outputs == NULL
 610                         && statement->clobbers == NULL)
 611                 goto end_of_print_asm_statement;
 612
 613         fputs(" : ", out);
 614         print_asm_constraints(statement->inputs);
 615         if(statement->outputs == NULL && statement->clobbers == NULL)
 616                 goto end_of_print_asm_statement;
 617
 618         fputs(" : ", out);
 619         print_asm_constraints(statement->outputs);
 620         if(statement->clobbers == NULL)
 621                 goto end_of_print_asm_statement;
 622
 623         fputs(" : ", out);
 624         print_asm_clobbers(statement->clobbers);
 625
 626 end_of_print_asm_statement:
 627         fputs(");\n", out);
 628 }
 629
 630 void print_statement(const statement_t *statement)
 631 {
 632         switch(statement->kind) {
 633         case STATEMENT_COMPOUND:
 634                 print_compound_statement(&statement->compound);
 635                 break;
 636         case STATEMENT_RETURN:
 637                 print_return_statement(&statement->returns);
 638                 break;
 639         case STATEMENT_EXPRESSION:
 640                 print_expression_statement(&statement->expression);
 641                 break;
 642         case STATEMENT_LABEL:
 643                 print_label_statement(&statement->label);
 644                 break;
 645         case STATEMENT_GOTO:
 646                 print_goto_statement(&statement->gotos);
 647                 break;
 648         case STATEMENT_CONTINUE:
 649                 fputs("continue;\n", out);
 650                 break;
 651         case STATEMENT_BREAK:
 652                 fputs("break;\n", out);
 653                 break;
 654         case STATEMENT_IF:
 655                 print_if_statement(&statement->ifs);
 656                 break;
 657         case STATEMENT_SWITCH:
 658                 print_switch_statement(&statement->switchs);
 659                 break;
 660         case STATEMENT_CASE_LABEL:
 661                 print_case_label(&statement->case_label);
 662                 break;
 663         case STATEMENT_DECLARATION:
 664                 print_declaration_statement(&statement->declaration);
 665                 break;
 666         case STATEMENT_WHILE:
 667                 print_while_statement(&statement->whiles);
 668                 break;
 669         case STATEMENT_DO_WHILE:
 670                 print_do_while_statement(&statement->do_while);
 671                 break;
 672         case STATEMENT_FOR:
 673                 print_for_statement(&statement->fors);
 674                 break;
 675         case STATEMENT_ASM:
 676                 print_asm_statement(&statement->asms);
 677                 break;
 678         case STATEMENT_INVALID:
 679                 fprintf(out, "*invalid statement*");
 680                 break;
 681         }
 682 }
 683
 684 static void print_storage_class(unsigned storage_class)
 685 {
 686         switch((storage_class_tag_t) storage_class) {
 687         case STORAGE_CLASS_ENUM_ENTRY:
 688         case STORAGE_CLASS_NONE:
 689                 break;
 690         case STORAGE_CLASS_TYPEDEF:       fputs("typedef ",        out); break;
 691         case STORAGE_CLASS_EXTERN:        fputs("extern ",         out); break;
 692         case STORAGE_CLASS_STATIC:        fputs("static ",         out); break;
 693         case STORAGE_CLASS_AUTO:          fputs("auto ",           out); break;
 694         case STORAGE_CLASS_REGISTER:      fputs("register ",       out); break;
 695         case STORAGE_CLASS_THREAD:        fputs("__thread",        out); break;
 696         case STORAGE_CLASS_THREAD_EXTERN: fputs("extern __thread", out); break;
 697         case STORAGE_CLASS_THREAD_STATIC: fputs("static __thread", out); break;
 698         }
 699 }
 700
 701 void print_initializer(const initializer_t *initializer)
 702 {
 703         if(initializer->kind == INITIALIZER_VALUE) {
 704                 const initializer_value_t *value = &initializer->value;
 705                 print_expression(value->value);
 706                 return;
 707         }
 708
 709         assert(initializer->kind == INITIALIZER_LIST);
 710         fputs("{ ", out);
 711         const initializer_list_t *list = &initializer->list;
 712
 713         for(size_t i = 0 ; i < list->len; ++i) {
 714                 if(i > 0) {
 715                         fputs(", ", out);
 716                 }
 717                 print_initializer(list->initializers[i]);
 718         }
 719         fputs("}", out);
 720 }
 721
 722 static void print_normal_declaration(const declaration_t *declaration)
 723 {
 724         print_storage_class(declaration->storage_class);
 725         if(declaration->is_inline) {
 726                 if (declaration->decl_modifiers & DM_FORCEINLINE)
 727                         fputs("__forceinline ", out);
 728                 else
 729                         fputs("inline ", out);
 730         }
 731         print_type_ext(declaration->type, declaration->symbol,
 732                        &declaration->context);
 733
 734         if(declaration->type->kind == TYPE_FUNCTION) {
 735                 if(declaration->init.statement != NULL) {
 736                         fputs("\n", out);
 737                         print_statement(declaration->init.statement);
 738                         return;
 739                 }
 740         } else if(declaration->init.initializer != NULL) {
 741                 fputs(" = ", out);
 742                 print_initializer(declaration->init.initializer);
 743         }
 744         fputc(';', out);
 745 }
 746
 747 void print_declaration(const declaration_t *declaration)
 748 {
 749         if(declaration->namespc != NAMESPACE_NORMAL &&
 750                         declaration->symbol == NULL)
 751                 return;
 752
 753         switch(declaration->namespc) {
 754         case NAMESPACE_NORMAL:
 755                 print_normal_declaration(declaration);
 756                 break;
 757         case NAMESPACE_STRUCT:
 758                 fputs("struct ", out);
 759                 fputs(declaration->symbol->string, out);
 760                 fputc(' ', out);
 761                 print_compound_definition(declaration);
 762                 fputc(';', out);
 763                 break;
 764         case NAMESPACE_UNION:
 765                 fputs("union ", out);
 766                 fputs(declaration->symbol->string, out);
 767                 fputc(' ', out);
 768                 print_compound_definition(declaration);
 769                 fputc(';', out);
 770                 break;
 771         case NAMESPACE_ENUM:
 772                 fputs("enum ", out);
 773                 fputs(declaration->symbol->string, out);
 774                 fputc(' ', out);
 775                 print_enum_definition(declaration);
 776                 fputc(';', out);
 777                 break;
 778         }
 779 }
 780
 781 void print_ast(const translation_unit_t *unit)
 782 {
 783         inc_type_visited();
 784
 785         declaration_t *declaration = unit->context.declarations;
 786         for( ; declaration != NULL; declaration = declaration->next) {
 787                 if(declaration->storage_class == STORAGE_CLASS_ENUM_ENTRY)
 788                         continue;
 789                 if(declaration->namespc != NAMESPACE_NORMAL &&
 790                                 declaration->symbol == NULL)
 791                         continue;
 792
 793                 print_indent();
 794                 print_declaration(declaration);
 795                 fputc('\n', out);
 796         }
 797 }
 798
 799 bool is_constant_expression(const expression_t *expression)
 800 {
 801         switch(expression->kind) {
 802
 803         case EXPR_CONST:
 804         case EXPR_STRING_LITERAL:
 805         case EXPR_WIDE_STRING_LITERAL:
 806         case EXPR_SIZEOF:
 807         case EXPR_CLASSIFY_TYPE:
 808         case EXPR_FUNCTION:
 809         case EXPR_PRETTY_FUNCTION:
 810         case EXPR_OFFSETOF:
 811                 return true;
 812
 813         case EXPR_BUILTIN_SYMBOL:
 814         case EXPR_CALL:
 815         case EXPR_SELECT:
 816         case EXPR_VA_START:
 817         case EXPR_VA_ARG:
 818         case EXPR_STATEMENT:
 819         case EXPR_UNARY_POSTFIX_INCREMENT:
 820         case EXPR_UNARY_POSTFIX_DECREMENT:
 821         case EXPR_UNARY_PREFIX_INCREMENT:
 822         case EXPR_UNARY_PREFIX_DECREMENT:
 823         case EXPR_UNARY_ASSUME: /* has VOID type */
 824         case EXPR_BINARY_ASSIGN:
 825         case EXPR_BINARY_MUL_ASSIGN:
 826         case EXPR_BINARY_DIV_ASSIGN:
 827         case EXPR_BINARY_MOD_ASSIGN:
 828         case EXPR_BINARY_ADD_ASSIGN:
 829         case EXPR_BINARY_SUB_ASSIGN:
 830         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
 831         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
 832         case EXPR_BINARY_BITWISE_AND_ASSIGN:
 833         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
 834         case EXPR_BINARY_BITWISE_OR_ASSIGN:
 835         case EXPR_BINARY_COMMA:
 836                 return false;
 837
 838         case EXPR_UNARY_NEGATE:
 839         case EXPR_UNARY_PLUS:
 840         case EXPR_UNARY_BITWISE_NEGATE:
 841         case EXPR_UNARY_NOT:
 842         case EXPR_UNARY_DEREFERENCE:
 843         case EXPR_UNARY_TAKE_ADDRESS:
 844         case EXPR_UNARY_CAST:
 845         case EXPR_UNARY_CAST_IMPLICIT:
 846                 return is_constant_expression(expression->unary.value);
 847
 848         case EXPR_BINARY_ADD:
 849         case EXPR_BINARY_SUB:
 850         case EXPR_BINARY_MUL:
 851         case EXPR_BINARY_DIV:
 852         case EXPR_BINARY_MOD:
 853         case EXPR_BINARY_EQUAL:
 854         case EXPR_BINARY_NOTEQUAL:
 855         case EXPR_BINARY_LESS:
 856         case EXPR_BINARY_LESSEQUAL:
 857         case EXPR_BINARY_GREATER:
 858         case EXPR_BINARY_GREATEREQUAL:
 859         case EXPR_BINARY_BITWISE_AND:
 860         case EXPR_BINARY_BITWISE_OR:
 861         case EXPR_BINARY_BITWISE_XOR:
 862         case EXPR_BINARY_LOGICAL_AND:
 863         case EXPR_BINARY_LOGICAL_OR:
 864         case EXPR_BINARY_SHIFTLEFT:
 865         case EXPR_BINARY_SHIFTRIGHT:
 866         case EXPR_BINARY_BUILTIN_EXPECT:
 867         case EXPR_BINARY_ISGREATER:
 868         case EXPR_BINARY_ISGREATEREQUAL:
 869         case EXPR_BINARY_ISLESS:
 870         case EXPR_BINARY_ISLESSEQUAL:
 871         case EXPR_BINARY_ISLESSGREATER:
 872         case EXPR_BINARY_ISUNORDERED:
 873                 return is_constant_expression(expression->binary.left)
 874                         && is_constant_expression(expression->binary.right);
 875
 876         case EXPR_CONDITIONAL:
 877                 /* TODO: not correct, we only have to test expressions which are
 878                  * evaluated, which means either the true or false part might be not
 879                  * constant */
 880                 return is_constant_expression(expression->conditional.condition)
 881                         && is_constant_expression(expression->conditional.true_expression)
 882                         && is_constant_expression(expression->conditional.false_expression);
 883
 884         case EXPR_ARRAY_ACCESS:
 885                 return is_constant_expression(expression->array_access.array_ref)
 886                         && is_constant_expression(expression->array_access.index);
 887
 888         case EXPR_REFERENCE: {
 889                 declaration_t *declaration = expression->reference.declaration;
 890                 if(declaration->storage_class == STORAGE_CLASS_ENUM_ENTRY)
 891                         return true;
 892
 893                 return false;
 894         }
 895
 896         case EXPR_UNKNOWN:
 897         case EXPR_INVALID:
 898                 break;
 899         }
 900         panic("invalid expression found (is constant expression)");
 901 }
 902
 903
 904 void init_ast(void)
 905 {
 906         obstack_init(&ast_obstack);
 907 }
 908
 909 void exit_ast(void)
 910 {
 911         obstack_free(&ast_obstack, NULL);
 912 }
 913
 914 void ast_set_output(FILE *stream)
 915 {
 916         out = stream;
 917         type_set_output(stream);
 918 }
 919
 920 void* (allocate_ast) (size_t size)
 921 {
 922         return _allocate_ast(size);
 923 }