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