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                 print_expression(unexpr->value);
 171                 return;
 172         case UNEXPR_INVALID:
 173                 fprintf(out, "unop%d", (int) unexpr->type);
 174                 break;
 175         }
 176         fputs("(", out);
 177         print_expression(unexpr->value);
 178         fputs(")", out);
 179 }
 180
 181 static void print_reference_expression(const reference_expression_t *ref)
 182 {
 183         fprintf(out, "%s", ref->declaration->symbol->string);
 184 }
 185
 186 static void print_array_expression(const array_access_expression_t *expression)
 187 {
 188         if(!expression->flipped) {
 189                 fputs("(", out);
 190                 print_expression(expression->array_ref);
 191                 fputs(")[", out);
 192                 print_expression(expression->index);
 193                 fputs("]", out);
 194         } else {
 195                 fputs("(", out);
 196                 print_expression(expression->index);
 197                 fputs(")[", out);
 198                 print_expression(expression->array_ref);
 199                 fputs("]", out);
 200         }
 201 }
 202
 203 static void print_sizeof_expression(const sizeof_expression_t *expression)
 204 {
 205         fputs("sizeof", out);
 206         if(expression->size_expression != NULL) {
 207                 fputc('(', out);
 208                 print_expression(expression->size_expression);
 209                 fputc(')', out);
 210         } else {
 211                 fputc('(', out);
 212                 print_type(expression->type);
 213                 fputc(')', out);
 214         }
 215 }
 216
 217 static void print_builtin_symbol(const builtin_symbol_expression_t *expression)
 218 {
 219         fputs(expression->symbol->string, out);
 220 }
 221
 222 static void print_conditional(const conditional_expression_t *expression)
 223 {
 224         fputs("(", out);
 225         print_expression(expression->condition);
 226         fputs(" ? ", out);
 227         print_expression(expression->true_expression);
 228         fputs(" : ", out);
 229         print_expression(expression->false_expression);
 230         fputs(")", out);
 231 }
 232
 233 static void print_va_arg(const va_arg_expression_t *expression)
 234 {
 235         fputs("__builtin_va_arg(", out);
 236         print_expression(expression->arg);
 237         fputs(", ", out);
 238         print_type(expression->expression.datatype);
 239         fputs(")", out);
 240 }
 241
 242 static void print_select(const select_expression_t *expression)
 243 {
 244         print_expression(expression->compound);
 245         if(expression->compound->base.datatype == NULL ||
 246                         expression->compound->base.datatype->type == TYPE_POINTER) {
 247                 fputs("->", out);
 248         } else {
 249                 fputc('.', out);
 250         }
 251         fputs(expression->symbol->string, out);
 252 }
 253
 254 static void print_classify_type_expression(
 255         const classify_type_expression_t *const expr)
 256 {
 257         fputs("__builtin_classify_type(", out);
 258         print_expression(expr->type_expression);
 259         fputc(')', out);
 260 }
 261
 262 void print_expression(const expression_t *expression)
 263 {
 264         switch(expression->type) {
 265         case EXPR_UNKNOWN:
 266         case EXPR_INVALID:
 267                 fprintf(out, "*invalid expression*");
 268                 break;
 269         case EXPR_CONST:
 270                 print_const(&expression->conste);
 271                 break;
 272         case EXPR_FUNCTION:
 273         case EXPR_PRETTY_FUNCTION:
 274         case EXPR_STRING_LITERAL:
 275                 print_string_literal(&expression->string);
 276                 break;
 277         case EXPR_CALL:
 278                 print_call_expression(&expression->call);
 279                 break;
 280         case EXPR_BINARY:
 281                 print_binary_expression(&expression->binary);
 282                 break;
 283         case EXPR_REFERENCE:
 284                 print_reference_expression(&expression->reference);
 285                 break;
 286         case EXPR_ARRAY_ACCESS:
 287                 print_array_expression(&expression->array_access);
 288                 break;
 289         case EXPR_UNARY:
 290                 print_unary_expression(&expression->unary);
 291                 break;
 292         case EXPR_SIZEOF:
 293                 print_sizeof_expression(&expression->sizeofe);
 294                 break;
 295         case EXPR_BUILTIN_SYMBOL:
 296                 print_builtin_symbol(&expression->builtin_symbol);
 297                 break;
 298         case EXPR_CONDITIONAL:
 299                 print_conditional(&expression->conditional);
 300                 break;
 301         case EXPR_VA_ARG:
 302                 print_va_arg(&expression->va_arge);
 303                 break;
 304         case EXPR_SELECT:
 305                 print_select(&expression->select);
 306                 break;
 307         case EXPR_CLASSIFY_TYPE:
 308                 print_classify_type_expression(&expression->classify_type);
 309                 break;
 310
 311         case EXPR_OFFSETOF:
 312         case EXPR_STATEMENT:
 313                 /* TODO */
 314                 fprintf(out, "some expression of type %d", (int) expression->type);
 315                 break;
 316         }
 317 }
 318
 319 static void print_compound_statement(const compound_statement_t *block)
 320 {
 321         fputs("{\n", out);
 322         indent++;
 323
 324         statement_t *statement = block->statements;
 325         while(statement != NULL) {
 326                 print_indent();
 327                 print_statement(statement);
 328
 329                 statement = statement->base.next;
 330         }
 331         indent--;
 332         print_indent();
 333         fputs("}\n", out);
 334 }
 335
 336 static void print_return_statement(const return_statement_t *statement)
 337 {
 338         fprintf(out, "return ");
 339         if(statement->return_value != NULL)
 340                 print_expression(statement->return_value);
 341         fputs(";\n", out);
 342 }
 343
 344 static void print_expression_statement(const expression_statement_t *statement)
 345 {
 346         print_expression(statement->expression);
 347         fputs(";\n", out);
 348 }
 349
 350 static void print_goto_statement(const goto_statement_t *statement)
 351 {
 352         fprintf(out, "goto ");
 353         fputs(statement->label->symbol->string, out);
 354         fprintf(stderr, "(%p)", (void*) statement->label);
 355         fputs(";\n", out);
 356 }
 357
 358 static void print_label_statement(const label_statement_t *statement)
 359 {
 360         fprintf(stderr, "(%p)", (void*) statement->label);
 361         fprintf(out, "%s:\n", statement->label->symbol->string);
 362         if(statement->label_statement != NULL) {
 363                 print_statement(statement->label_statement);
 364         }
 365 }
 366
 367 static void print_if_statement(const if_statement_t *statement)
 368 {
 369         fputs("if(", out);
 370         print_expression(statement->condition);
 371         fputs(") ", out);
 372         if(statement->true_statement != NULL) {
 373                 print_statement(statement->true_statement);
 374         }
 375
 376         if(statement->false_statement != NULL) {
 377                 print_indent();
 378                 fputs("else ", out);
 379                 print_statement(statement->false_statement);
 380         }
 381 }
 382
 383 static void print_switch_statement(const switch_statement_t *statement)
 384 {
 385         fputs("switch(", out);
 386         print_expression(statement->expression);
 387         fputs(") ", out);
 388         print_statement(statement->body);
 389 }
 390
 391 static void print_case_label(const case_label_statement_t *statement)
 392 {
 393         if(statement->expression == NULL) {
 394                 fputs("default:\n", out);
 395         } else {
 396                 fputs("case ", out);
 397                 print_expression(statement->expression);
 398                 fputs(":\n", out);
 399         }
 400         print_statement(statement->label_statement);
 401 }
 402
 403 static void print_declaration_statement(
 404                 const declaration_statement_t *statement)
 405 {
 406         int first = 1;
 407         declaration_t *declaration = statement->declarations_begin;
 408         for( ; declaration != statement->declarations_end->next;
 409                declaration = declaration->next) {
 410                 if(!first) {
 411                         print_indent();
 412                 } else {
 413                         first = 0;
 414                 }
 415                 print_declaration(declaration);
 416                 fputc('\n', out);
 417         }
 418 }
 419
 420 static void print_while_statement(const while_statement_t *statement)
 421 {
 422         fputs("while(", out);
 423         print_expression(statement->condition);
 424         fputs(") ", out);
 425         print_statement(statement->body);
 426 }
 427
 428 static void print_do_while_statement(const do_while_statement_t *statement)
 429 {
 430         fputs("do ", out);
 431         print_statement(statement->body);
 432         print_indent();
 433         fputs("while(", out);
 434         print_expression(statement->condition);
 435         fputs(");\n", out);
 436 }
 437
 438 static void print_for_statement(const for_statement_t *statement)
 439 {
 440         fputs("for(", out);
 441         if(statement->context.declarations != NULL) {
 442                 assert(statement->initialisation == NULL);
 443                 print_declaration(statement->context.declarations);
 444                 if(statement->context.declarations->next != NULL) {
 445                         panic("multiple declarations in for statement not supported yet");
 446                 }
 447                 fputc(' ', out);
 448         } else {
 449                 if(statement->initialisation) {
 450                         print_expression(statement->initialisation);
 451                 }
 452                 fputs("; ", out);
 453         }
 454         if(statement->condition != NULL) {
 455                 print_expression(statement->condition);
 456         }
 457         fputs("; ", out);
 458         if(statement->step != NULL) {
 459                 print_expression(statement->step);
 460         }
 461         fputs(")", out);
 462         print_statement(statement->body);
 463 }
 464
 465 static void print_asm_constraints(asm_constraint_t *constraints)
 466 {
 467         asm_constraint_t *constraint = constraints;
 468         for( ; constraint != NULL; constraint = constraint->next) {
 469                 if(constraint != constraints)
 470                         fputs(", ", out);
 471
 472                 if(constraint->symbol) {
 473                         fprintf(out, "[%s] ", constraint->symbol->string);
 474                 }
 475                 print_quoted_string(constraint->constraints);
 476                 fputs(" (", out);
 477                 print_expression(constraint->expression);
 478                 fputs(")", out);
 479         }
 480 }
 481
 482 static void print_asm_clobbers(asm_clobber_t *clobbers)
 483 {
 484         asm_clobber_t *clobber = clobbers;
 485         for( ; clobber != NULL; clobber = clobber->next) {
 486                 if(clobber != clobbers)
 487                         fputs(", ", out);
 488
 489                 print_quoted_string(clobber->clobber);
 490         }
 491 }
 492
 493 static void print_asm_statement(const asm_statement_t *statement)
 494 {
 495         fputs("asm ", out);
 496         if(statement->is_volatile) {
 497                 fputs("volatile ", out);
 498         }
 499         fputs("(", out);
 500         print_quoted_string(statement->asm_text);
 501         if(statement->inputs == NULL && statement->outputs == NULL
 502                         && statement->clobbers == NULL)
 503                 goto end_of_print_asm_statement;
 504
 505         fputs(" : ", out);
 506         print_asm_constraints(statement->inputs);
 507         if(statement->outputs == NULL && statement->clobbers == NULL)
 508                 goto end_of_print_asm_statement;
 509
 510         fputs(" : ", out);
 511         print_asm_constraints(statement->outputs);
 512         if(statement->clobbers == NULL)
 513                 goto end_of_print_asm_statement;
 514
 515         fputs(" : ", out);
 516         print_asm_clobbers(statement->clobbers);
 517
 518 end_of_print_asm_statement:
 519         fputs(");\n", out);
 520 }
 521
 522 void print_statement(const statement_t *statement)
 523 {
 524         switch(statement->type) {
 525         case STATEMENT_COMPOUND:
 526                 print_compound_statement(&statement->compound);
 527                 break;
 528         case STATEMENT_RETURN:
 529                 print_return_statement(&statement->returns);
 530                 break;
 531         case STATEMENT_EXPRESSION:
 532                 print_expression_statement(&statement->expression);
 533                 break;
 534         case STATEMENT_LABEL:
 535                 print_label_statement(&statement->label);
 536                 break;
 537         case STATEMENT_GOTO:
 538                 print_goto_statement(&statement->gotos);
 539                 break;
 540         case STATEMENT_CONTINUE:
 541                 fputs("continue;\n", out);
 542                 break;
 543         case STATEMENT_BREAK:
 544                 fputs("break;\n", out);
 545                 break;
 546         case STATEMENT_IF:
 547                 print_if_statement(&statement->ifs);
 548                 break;
 549         case STATEMENT_SWITCH:
 550                 print_switch_statement(&statement->switchs);
 551                 break;
 552         case STATEMENT_CASE_LABEL:
 553                 print_case_label(&statement->case_label);
 554                 break;
 555         case STATEMENT_DECLARATION:
 556                 print_declaration_statement(&statement->declaration);
 557                 break;
 558         case STATEMENT_WHILE:
 559                 print_while_statement(&statement->whiles);
 560                 break;
 561         case STATEMENT_DO_WHILE:
 562                 print_do_while_statement(&statement->do_while);
 563                 break;
 564         case STATEMENT_FOR:
 565                 print_for_statement(&statement->fors);
 566                 break;
 567         case STATEMENT_ASM:
 568                 print_asm_statement(&statement->asms);
 569                 break;
 570         case STATEMENT_INVALID:
 571                 fprintf(out, "*invalid statement*");
 572                 break;
 573         }
 574 }
 575
 576 static void print_storage_class(unsigned storage_class)
 577 {
 578         switch((storage_class_tag_t) storage_class) {
 579         case STORAGE_CLASS_ENUM_ENTRY:
 580         case STORAGE_CLASS_NONE:
 581                 break;
 582         case STORAGE_CLASS_TYPEDEF:       fputs("typedef ",        out); break;
 583         case STORAGE_CLASS_EXTERN:        fputs("extern ",         out); break;
 584         case STORAGE_CLASS_STATIC:        fputs("static ",         out); break;
 585         case STORAGE_CLASS_AUTO:          fputs("auto ",           out); break;
 586         case STORAGE_CLASS_REGISTER:      fputs("register ",       out); break;
 587         case STORAGE_CLASS_THREAD:        fputs("__thread",        out); break;
 588         case STORAGE_CLASS_THREAD_EXTERN: fputs("extern __thread", out); break;
 589         case STORAGE_CLASS_THREAD_STATIC: fputs("static __thread", out); break;
 590         }
 591 }
 592
 593 void print_initializer(const initializer_t *initializer)
 594 {
 595         if(initializer->type == INITIALIZER_VALUE) {
 596                 const initializer_value_t *value = &initializer->value;
 597                 print_expression(value->value);
 598                 return;
 599         }
 600
 601         assert(initializer->type == INITIALIZER_LIST);
 602         fputs("{ ", out);
 603         const initializer_list_t *list = &initializer->list;
 604
 605         for(size_t i = 0 ; i < list->len; ++i) {
 606                 if(i > 0) {
 607                         fputs(", ", out);
 608                 }
 609                 print_initializer(list->initializers[i]);
 610         }
 611         fputs("}", out);
 612 }
 613
 614 static void print_normal_declaration(const declaration_t *declaration)
 615 {
 616         print_storage_class(declaration->storage_class);
 617         if(declaration->is_inline) {
 618                 fputs("inline ", out);
 619         }
 620         print_type_ext(declaration->type, declaration->symbol,
 621                        &declaration->context);
 622
 623         if(declaration->type->type == TYPE_FUNCTION) {
 624                 if(declaration->init.statement != NULL) {
 625                         fputs("\n", out);
 626                         print_statement(declaration->init.statement);
 627                         return;
 628                 }
 629         } else if(declaration->init.initializer != NULL) {
 630                 fputs(" = ", out);
 631                 print_initializer(declaration->init.initializer);
 632         }
 633         fputc(';', out);
 634 }
 635
 636 void print_declaration(const declaration_t *declaration)
 637 {
 638         if(declaration->namespc != NAMESPACE_NORMAL &&
 639                         declaration->symbol == NULL)
 640                 return;
 641
 642         switch(declaration->namespc) {
 643         case NAMESPACE_NORMAL:
 644                 print_normal_declaration(declaration);
 645                 break;
 646         case NAMESPACE_STRUCT:
 647                 fputs("struct ", out);
 648                 fputs(declaration->symbol->string, out);
 649                 fputc(' ', out);
 650                 print_compound_definition(declaration);
 651                 fputc(';', out);
 652                 break;
 653         case NAMESPACE_UNION:
 654                 fputs("union ", out);
 655                 fputs(declaration->symbol->string, out);
 656                 fputc(' ', out);
 657                 print_compound_definition(declaration);
 658                 fputc(';', out);
 659                 break;
 660         case NAMESPACE_ENUM:
 661                 fputs("enum ", out);
 662                 fputs(declaration->symbol->string, out);
 663                 fputc(' ', out);
 664                 print_enum_definition(declaration);
 665                 fputc(';', out);
 666                 break;
 667         }
 668 }
 669
 670 void print_ast(const translation_unit_t *unit)
 671 {
 672         inc_type_visited();
 673
 674         declaration_t *declaration = unit->context.declarations;
 675         for( ; declaration != NULL; declaration = declaration->next) {
 676                 if(declaration->storage_class == STORAGE_CLASS_ENUM_ENTRY)
 677                         continue;
 678                 if(declaration->namespc != NAMESPACE_NORMAL &&
 679                                 declaration->symbol == NULL)
 680                         continue;
 681
 682                 print_indent();
 683                 print_declaration(declaration);
 684                 fputc('\n', out);
 685         }
 686 }
 687
 688 void init_ast(void)
 689 {
 690         obstack_init(&ast_obstack);
 691 }
 692
 693 void exit_ast(void)
 694 {
 695         obstack_free(&ast_obstack, NULL);
 696 }
 697
 698 void ast_set_output(FILE *stream)
 699 {
 700         out = stream;
 701         type_set_output(stream);
 702 }
 703
 704 void* (allocate_ast) (size_t size)
 705 {
 706         return _allocate_ast(size);
 707 }