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_call_expression(const call_expression_t *call)
  78 {
  79         print_expression(call->function);
  80         fprintf(out, "(");
  81         call_argument_t *argument = call->arguments;
  82         int              first    = 1;
  83         while(argument != NULL) {
  84                 if(!first) {
  85                         fprintf(out, ", ");
  86                 } else {
  87                         first = 0;
  88                 }
  89                 print_expression(argument->expression);
  90
  91                 argument = argument->next;
  92         }
  93         fprintf(out, ")");
  94 }
  95
  96 static void print_binary_expression(const binary_expression_t *binexpr)
  97 {
  98         fprintf(out, "(");
  99         print_expression(binexpr->left);
 100         fprintf(out, " ");
 101         switch(binexpr->type) {
 102         case BINEXPR_INVALID:            fputs("INVOP", out); break;
 103         case BINEXPR_COMMA:              fputs(",", out);     break;
 104         case BINEXPR_ASSIGN:             fputs("=", out);     break;
 105         case BINEXPR_ADD:                fputs("+", out);     break;
 106         case BINEXPR_SUB:                fputs("-", out);     break;
 107         case BINEXPR_MUL:                fputs("*", out);     break;
 108         case BINEXPR_MOD:                fputs("%", out);     break;
 109         case BINEXPR_DIV:                fputs("/", out);     break;
 110         case BINEXPR_BITWISE_OR:         fputs("|", out);     break;
 111         case BINEXPR_BITWISE_AND:        fputs("&", out);     break;
 112         case BINEXPR_BITWISE_XOR:        fputs("^", out);     break;
 113         case BINEXPR_LOGICAL_OR:         fputs("||", out);    break;
 114         case BINEXPR_LOGICAL_AND:        fputs("&&", out);    break;
 115         case BINEXPR_NOTEQUAL:           fputs("!=", out);    break;
 116         case BINEXPR_EQUAL:              fputs("==", out);    break;
 117         case BINEXPR_LESS:               fputs("<", out);     break;
 118         case BINEXPR_LESSEQUAL:          fputs("<=", out);    break;
 119         case BINEXPR_GREATER:            fputs(">", out);     break;
 120         case BINEXPR_GREATEREQUAL:       fputs(">=", out);    break;
 121         case BINEXPR_SHIFTLEFT:          fputs("<<", out);    break;
 122         case BINEXPR_SHIFTRIGHT:         fputs(">>", out);    break;
 123
 124         case BINEXPR_ADD_ASSIGN:         fputs("+=", out);    break;
 125         case BINEXPR_SUB_ASSIGN:         fputs("-=", out);    break;
 126         case BINEXPR_MUL_ASSIGN:         fputs("*=", out);    break;
 127         case BINEXPR_MOD_ASSIGN:         fputs("%=", out);    break;
 128         case BINEXPR_DIV_ASSIGN:         fputs("/=", out);    break;
 129         case BINEXPR_BITWISE_OR_ASSIGN:  fputs("|=", out);    break;
 130         case BINEXPR_BITWISE_AND_ASSIGN: fputs("&=", out);    break;
 131         case BINEXPR_BITWISE_XOR_ASSIGN: fputs("^=", out);    break;
 132         case BINEXPR_SHIFTLEFT_ASSIGN:   fputs("<<=", out);   break;
 133         case BINEXPR_SHIFTRIGHT_ASSIGN:  fputs(">>=", out);   break;
 134         }
 135         fprintf(out, " ");
 136         print_expression(binexpr->right);
 137         fprintf(out, ")");
 138 }
 139
 140 static void print_unary_expression(const unary_expression_t *unexpr)
 141 {
 142         switch(unexpr->type) {
 143         case UNEXPR_NEGATE:           fputs("-", out);  break;
 144         case UNEXPR_PLUS:             fputs("+", out);  break;
 145         case UNEXPR_NOT:              fputs("!", out);  break;
 146         case UNEXPR_BITWISE_NEGATE:   fputs("~", out);  break;
 147         case UNEXPR_PREFIX_INCREMENT: fputs("++", out); break;
 148         case UNEXPR_PREFIX_DECREMENT: fputs("--", out); break;
 149         case UNEXPR_DEREFERENCE:      fputs("*", out);  break;
 150         case UNEXPR_TAKE_ADDRESS:     fputs("&", out);  break;
 151
 152         case UNEXPR_POSTFIX_INCREMENT:
 153                 fputs("(", out);
 154                 print_expression(unexpr->value);
 155                 fputs(")", out);
 156                 fputs("++", out);
 157                 return;
 158         case UNEXPR_POSTFIX_DECREMENT:
 159                 fputs("(", out);
 160                 print_expression(unexpr->value);
 161                 fputs(")", out);
 162                 fputs("--", out);
 163                 return;
 164         case UNEXPR_CAST:
 165                 fputs("(", out);
 166                 print_type(unexpr->expression.datatype);
 167                 fputs(")", out);
 168                 break;
 169         case UNEXPR_CAST_IMPLICIT:
 170                 break;
 171         case UNEXPR_INVALID:
 172                 fprintf(out, "unop%d", (int) unexpr->type);
 173                 break;
 174         }
 175         fputs("(", out);
 176         print_expression(unexpr->value);
 177         fputs(")", out);
 178 }
 179
 180 static void print_reference_expression(const reference_expression_t *ref)
 181 {
 182         fprintf(out, "%s", ref->declaration->symbol->string);
 183 }
 184
 185 static void print_array_expression(const array_access_expression_t *expression)
 186 {
 187         if(!expression->flipped) {
 188                 fputs("(", out);
 189                 print_expression(expression->array_ref);
 190                 fputs(")[", out);
 191                 print_expression(expression->index);
 192                 fputs("]", out);
 193         } else {
 194                 fputs("(", out);
 195                 print_expression(expression->index);
 196                 fputs(")[", out);
 197                 print_expression(expression->array_ref);
 198                 fputs("]", out);
 199         }
 200 }
 201
 202 static void print_sizeof_expression(const sizeof_expression_t *expression)
 203 {
 204         fputs("sizeof", out);
 205         if(expression->size_expression != NULL) {
 206                 fputc('(', out);
 207                 print_expression(expression->size_expression);
 208                 fputc(')', out);
 209         } else {
 210                 fputc('(', out);
 211                 print_type(expression->type);
 212                 fputc(')', out);
 213         }
 214 }
 215
 216 static void print_builtin_symbol(const builtin_symbol_expression_t *expression)
 217 {
 218         fputs(expression->symbol->string, out);
 219 }
 220
 221 static void print_conditional(const conditional_expression_t *expression)
 222 {
 223         fputs("(", out);
 224         print_expression(expression->condition);
 225         fputs(" ? ", out);
 226         print_expression(expression->true_expression);
 227         fputs(" : ", out);
 228         print_expression(expression->false_expression);
 229         fputs(")", out);
 230 }
 231
 232 static void print_va_arg(const va_arg_expression_t *expression)
 233 {
 234         fputs("__builtin_va_arg(", out);
 235         print_expression(expression->arg);
 236         fputs(", ", out);
 237         print_type(expression->expression.datatype);
 238         fputs(")", out);
 239 }
 240
 241 static void print_select(const select_expression_t *expression)
 242 {
 243         print_expression(expression->compound);
 244         if(expression->compound->base.datatype == NULL ||
 245                         expression->compound->base.datatype->type == TYPE_POINTER) {
 246                 fputs("->", out);
 247         } else {
 248                 fputc('.', out);
 249         }
 250         fputs(expression->symbol->string, out);
 251 }
 252
 253 static void print_classify_type_expression(
 254         const classify_type_expression_t *const expr)
 255 {
 256         fputs("__builtin_classify_type(", out);
 257         print_expression(expr->type_expression);
 258         fputc(')', out);
 259 }
 260
 261 void print_expression(const expression_t *expression)
 262 {
 263         switch(expression->type) {
 264         case EXPR_UNKNOWN:
 265         case EXPR_INVALID:
 266                 fprintf(out, "*invalid expression*");
 267                 break;
 268         case EXPR_CONST:
 269                 print_const(&expression->conste);
 270                 break;
 271         case EXPR_FUNCTION:
 272         case EXPR_PRETTY_FUNCTION:
 273         case EXPR_STRING_LITERAL:
 274                 print_string_literal(&expression->string);
 275                 break;
 276         case EXPR_CALL:
 277                 print_call_expression(&expression->call);
 278                 break;
 279         case EXPR_BINARY:
 280                 print_binary_expression(&expression->binary);
 281                 break;
 282         case EXPR_REFERENCE:
 283                 print_reference_expression(&expression->reference);
 284                 break;
 285         case EXPR_ARRAY_ACCESS:
 286                 print_array_expression(&expression->array_access);
 287                 break;
 288         case EXPR_UNARY:
 289                 print_unary_expression(&expression->unary);
 290                 break;
 291         case EXPR_SIZEOF:
 292                 print_sizeof_expression(&expression->sizeofe);
 293                 break;
 294         case EXPR_BUILTIN_SYMBOL:
 295                 print_builtin_symbol(&expression->builtin_symbol);
 296                 break;
 297         case EXPR_CONDITIONAL:
 298                 print_conditional(&expression->conditional);
 299                 break;
 300         case EXPR_VA_ARG:
 301                 print_va_arg(&expression->va_arge);
 302                 break;
 303         case EXPR_SELECT:
 304                 print_select(&expression->select);
 305                 break;
 306         case EXPR_CLASSIFY_TYPE:
 307                 print_classify_type_expression(&expression->classify_type);
 308                 break;
 309
 310         case EXPR_OFFSETOF:
 311         case EXPR_STATEMENT:
 312                 /* TODO */
 313                 fprintf(out, "some expression of type %d", (int) expression->type);
 314                 break;
 315         }
 316 }
 317
 318 static void print_compound_statement(const compound_statement_t *block)
 319 {
 320         fputs("{\n", out);
 321         indent++;
 322
 323         statement_t *statement = block->statements;
 324         while(statement != NULL) {
 325                 print_indent();
 326                 print_statement(statement);
 327
 328                 statement = statement->base.next;
 329         }
 330         indent--;
 331         print_indent();
 332         fputs("}\n", out);
 333 }
 334
 335 static void print_return_statement(const return_statement_t *statement)
 336 {
 337         fprintf(out, "return ");
 338         if(statement->return_value != NULL)
 339                 print_expression(statement->return_value);
 340         fputs(";\n", out);
 341 }
 342
 343 static void print_expression_statement(const expression_statement_t *statement)
 344 {
 345         print_expression(statement->expression);
 346         fputs(";\n", out);
 347 }
 348
 349 static void print_goto_statement(const goto_statement_t *statement)
 350 {
 351         fprintf(out, "goto ");
 352         fputs(statement->label->symbol->string, out);
 353         fprintf(stderr, "(%p)", (void*) statement->label);
 354         fputs(";\n", out);
 355 }
 356
 357 static void print_label_statement(const label_statement_t *statement)
 358 {
 359         fprintf(stderr, "(%p)", (void*) statement->label);
 360         fprintf(out, "%s:\n", statement->label->symbol->string);
 361         if(statement->label_statement != NULL) {
 362                 print_statement(statement->label_statement);
 363         }
 364 }
 365
 366 static void print_if_statement(const if_statement_t *statement)
 367 {
 368         fputs("if(", out);
 369         print_expression(statement->condition);
 370         fputs(") ", out);
 371         if(statement->true_statement != NULL) {
 372                 print_statement(statement->true_statement);
 373         }
 374
 375         if(statement->false_statement != NULL) {
 376                 print_indent();
 377                 fputs("else ", out);
 378                 print_statement(statement->false_statement);
 379         }
 380 }
 381
 382 static void print_switch_statement(const switch_statement_t *statement)
 383 {
 384         fputs("switch(", out);
 385         print_expression(statement->expression);
 386         fputs(") ", out);
 387         print_statement(statement->body);
 388 }
 389
 390 static void print_case_label(const case_label_statement_t *statement)
 391 {
 392         if(statement->expression == NULL) {
 393                 fputs("default:\n", out);
 394         } else {
 395                 fputs("case ", out);
 396                 print_expression(statement->expression);
 397                 fputs(":\n", out);
 398         }
 399         print_statement(statement->label_statement);
 400 }
 401
 402 static void print_declaration_statement(
 403                 const declaration_statement_t *statement)
 404 {
 405         int first = 1;
 406         declaration_t *declaration = statement->declarations_begin;
 407         for( ; declaration != statement->declarations_end->next;
 408                declaration = declaration->next) {
 409                 if(!first) {
 410                         print_indent();
 411                 } else {
 412                         first = 0;
 413                 }
 414                 print_declaration(declaration);
 415                 fputc('\n', out);
 416         }
 417 }
 418
 419 static void print_while_statement(const while_statement_t *statement)
 420 {
 421         fputs("while(", out);
 422         print_expression(statement->condition);
 423         fputs(") ", out);
 424         print_statement(statement->body);
 425 }
 426
 427 static void print_do_while_statement(const do_while_statement_t *statement)
 428 {
 429         fputs("do ", out);
 430         print_statement(statement->body);
 431         print_indent();
 432         fputs("while(", out);
 433         print_expression(statement->condition);
 434         fputs(");\n", out);
 435 }
 436
 437 static void print_for_statement(const for_statement_t *statement)
 438 {
 439         fputs("for(", out);
 440         if(statement->context.declarations != NULL) {
 441                 assert(statement->initialisation == NULL);
 442                 print_declaration(statement->context.declarations);
 443                 if(statement->context.declarations->next != NULL) {
 444                         panic("multiple declarations in for statement not supported yet");
 445                 }
 446                 fputc(' ', out);
 447         } else {
 448                 if(statement->initialisation) {
 449                         print_expression(statement->initialisation);
 450                 }
 451                 fputs("; ", out);
 452         }
 453         if(statement->condition != NULL) {
 454                 print_expression(statement->condition);
 455         }
 456         fputs("; ", out);
 457         if(statement->step != NULL) {
 458                 print_expression(statement->step);
 459         }
 460         fputs(")", out);
 461         print_statement(statement->body);
 462 }
 463
 464 static void print_asm_constraints(asm_constraint_t *constraints)
 465 {
 466         asm_constraint_t *constraint = constraints;
 467         for( ; constraint != NULL; constraint = constraint->next) {
 468                 if(constraint != constraints)
 469                         fputs(", ", out);
 470
 471                 if(constraint->symbol) {
 472                         fprintf(out, "[%s] ", constraint->symbol->string);
 473                 }
 474                 print_quoted_string(constraint->constraints);
 475                 fputs(" (", out);
 476                 print_expression(constraint->expression);
 477                 fputs(")", out);
 478         }
 479 }
 480
 481 static void print_asm_clobbers(asm_clobber_t *clobbers)
 482 {
 483         asm_clobber_t *clobber = clobbers;
 484         for( ; clobber != NULL; clobber = clobber->next) {
 485                 if(clobber != clobbers)
 486                         fputs(", ", out);
 487
 488                 print_quoted_string(clobber->clobber);
 489         }
 490 }
 491
 492 static void print_asm_statement(const asm_statement_t *statement)
 493 {
 494         fputs("asm ", out);
 495         if(statement->is_volatile) {
 496                 fputs("volatile ", out);
 497         }
 498         fputs("(", out);
 499         print_quoted_string(statement->asm_text);
 500         if(statement->inputs == NULL && statement->outputs == NULL
 501                         && statement->clobbers == NULL)
 502                 goto end_of_print_asm_statement;
 503
 504         fputs(" : ", out);
 505         print_asm_constraints(statement->inputs);
 506         if(statement->outputs == NULL && statement->clobbers == NULL)
 507                 goto end_of_print_asm_statement;
 508
 509         fputs(" : ", out);
 510         print_asm_constraints(statement->outputs);
 511         if(statement->clobbers == NULL)
 512                 goto end_of_print_asm_statement;
 513
 514         fputs(" : ", out);
 515         print_asm_clobbers(statement->clobbers);
 516
 517 end_of_print_asm_statement:
 518         fputs(");\n", out);
 519 }
 520
 521 void print_statement(const statement_t *statement)
 522 {
 523         switch(statement->type) {
 524         case STATEMENT_COMPOUND:
 525                 print_compound_statement(&statement->compound);
 526                 break;
 527         case STATEMENT_RETURN:
 528                 print_return_statement(&statement->returns);
 529                 break;
 530         case STATEMENT_EXPRESSION:
 531                 print_expression_statement(&statement->expression);
 532                 break;
 533         case STATEMENT_LABEL:
 534                 print_label_statement(&statement->label);
 535                 break;
 536         case STATEMENT_GOTO:
 537                 print_goto_statement(&statement->gotos);
 538                 break;
 539         case STATEMENT_CONTINUE:
 540                 fputs("continue;\n", out);
 541                 break;
 542         case STATEMENT_BREAK:
 543                 fputs("break;\n", out);
 544                 break;
 545         case STATEMENT_IF:
 546                 print_if_statement(&statement->ifs);
 547                 break;
 548         case STATEMENT_SWITCH:
 549                 print_switch_statement(&statement->switchs);
 550                 break;
 551         case STATEMENT_CASE_LABEL:
 552                 print_case_label(&statement->case_label);
 553                 break;
 554         case STATEMENT_DECLARATION:
 555                 print_declaration_statement(&statement->declaration);
 556                 break;
 557         case STATEMENT_WHILE:
 558                 print_while_statement(&statement->whiles);
 559                 break;
 560         case STATEMENT_DO_WHILE:
 561                 print_do_while_statement(&statement->do_while);
 562                 break;
 563         case STATEMENT_FOR:
 564                 print_for_statement(&statement->fors);
 565                 break;
 566         case STATEMENT_ASM:
 567                 print_asm_statement(&statement->asms);
 568                 break;
 569         case STATEMENT_INVALID:
 570                 fprintf(out, "*invalid statement*");
 571                 break;
 572         }
 573 }
 574
 575 static void print_storage_class(unsigned storage_class)
 576 {
 577         switch((storage_class_tag_t) storage_class) {
 578         case STORAGE_CLASS_ENUM_ENTRY:
 579         case STORAGE_CLASS_NONE:
 580                 break;
 581         case STORAGE_CLASS_TYPEDEF:       fputs("typedef ",        out); break;
 582         case STORAGE_CLASS_EXTERN:        fputs("extern ",         out); break;
 583         case STORAGE_CLASS_STATIC:        fputs("static ",         out); break;
 584         case STORAGE_CLASS_AUTO:          fputs("auto ",           out); break;
 585         case STORAGE_CLASS_REGISTER:      fputs("register ",       out); break;
 586         case STORAGE_CLASS_THREAD:        fputs("__thread",        out); break;
 587         case STORAGE_CLASS_THREAD_EXTERN: fputs("extern __thread", out); break;
 588         case STORAGE_CLASS_THREAD_STATIC: fputs("static __thread", out); break;
 589         }
 590 }
 591
 592 void print_initializer(const initializer_t *initializer)
 593 {
 594         if(initializer->type == INITIALIZER_VALUE) {
 595                 const initializer_value_t *value = &initializer->value;
 596                 print_expression(value->value);
 597                 return;
 598         }
 599
 600         assert(initializer->type == INITIALIZER_LIST);
 601         fputs("{ ", out);
 602         const initializer_list_t *list = &initializer->list;
 603
 604         for(size_t i = 0 ; i < list->len; ++i) {
 605                 if(i > 0) {
 606                         fputs(", ", out);
 607                 }
 608                 print_initializer(list->initializers[i]);
 609         }
 610         fputs("}", out);
 611 }
 612
 613 static void print_normal_declaration(const declaration_t *declaration)
 614 {
 615         print_storage_class(declaration->storage_class);
 616         if(declaration->is_inline) {
 617                 fputs("inline ", out);
 618         }
 619         print_type_ext(declaration->type, declaration->symbol,
 620                        &declaration->context);
 621
 622         if(declaration->type->type == TYPE_FUNCTION) {
 623                 if(declaration->init.statement != NULL) {
 624                         fputs("\n", out);
 625                         print_statement(declaration->init.statement);
 626                         return;
 627                 }
 628         } else if(declaration->init.initializer != NULL) {
 629                 fputs(" = ", out);
 630                 print_initializer(declaration->init.initializer);
 631         }
 632         fputc(';', out);
 633 }
 634
 635 void print_declaration(const declaration_t *declaration)
 636 {
 637         if(declaration->namespc != NAMESPACE_NORMAL &&
 638                         declaration->symbol == NULL)
 639                 return;
 640
 641         switch(declaration->namespc) {
 642         case NAMESPACE_NORMAL:
 643                 print_normal_declaration(declaration);
 644                 break;
 645         case NAMESPACE_STRUCT:
 646                 fputs("struct ", out);
 647                 fputs(declaration->symbol->string, out);
 648                 fputc(' ', out);
 649                 print_compound_definition(declaration);
 650                 fputc(';', out);
 651                 break;
 652         case NAMESPACE_UNION:
 653                 fputs("union ", out);
 654                 fputs(declaration->symbol->string, out);
 655                 fputc(' ', out);
 656                 print_compound_definition(declaration);
 657                 fputc(';', out);
 658                 break;
 659         case NAMESPACE_ENUM:
 660                 fputs("enum ", out);
 661                 fputs(declaration->symbol->string, out);
 662                 fputc(' ', out);
 663                 print_enum_definition(declaration);
 664                 fputc(';', out);
 665                 break;
 666         }
 667 }
 668
 669 void print_ast(const translation_unit_t *unit)
 670 {
 671         inc_type_visited();
 672
 673         declaration_t *declaration = unit->context.declarations;
 674         for( ; declaration != NULL; declaration = declaration->next) {
 675                 if(declaration->storage_class == STORAGE_CLASS_ENUM_ENTRY)
 676                         continue;
 677                 if(declaration->namespc != NAMESPACE_NORMAL &&
 678                                 declaration->symbol == NULL)
 679                         continue;
 680
 681                 print_indent();
 682                 print_declaration(declaration);
 683                 fputc('\n', out);
 684         }
 685 }
 686
 687 void init_ast(void)
 688 {
 689         obstack_init(&ast_obstack);
 690 }
 691
 692 void exit_ast(void)
 693 {
 694         obstack_free(&ast_obstack, NULL);
 695 }
 696
 697 void ast_set_output(FILE *stream)
 698 {
 699         out = stream;
 700         type_set_output(stream);
 701 }
 702
 703 void* (allocate_ast) (size_t size)
 704 {
 705         return _allocate_ast(size);
 706 }