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