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_string_literal(
  45                 const string_literal_expression_t *string_literal)
  46 {
  47         fputc('"', out);
  48         for(const char *c = string_literal->value; *c != '\0'; ++c) {
  49                 switch(*c) {
  50                 case '\"':  fputs("\\\"", out); break;
  51                 case '\\':  fputs("\\\\", out); break;
  52                 case '\a':  fputs("\\a", out); break;
  53                 case '\b':  fputs("\\b", out); break;
  54                 case '\f':  fputs("\\f", out); break;
  55                 case '\n':  fputs("\\n", out); break;
  56                 case '\r':  fputs("\\r", out); break;
  57                 case '\t':  fputs("\\t", out); break;
  58                 case '\v':  fputs("\\v", out); break;
  59                 case '\?':  fputs("\\?", out); break;
  60                 default:
  61                         if(!isprint(*c)) {
  62                                 fprintf(out, "\\x%x", *c);
  63                                 break;
  64                         }
  65                         fputc(*c, out);
  66                         break;
  67                 }
  68         }
  69         fputc('"', out);
  70 }
  71
  72 static void print_call_expression(const call_expression_t *call)
  73 {
  74         print_expression(call->function);
  75         fprintf(out, "(");
  76         call_argument_t *argument = call->arguments;
  77         int              first    = 1;
  78         while(argument != NULL) {
  79                 if(!first) {
  80                         fprintf(out, ", ");
  81                 } else {
  82                         first = 0;
  83                 }
  84                 print_expression(argument->expression);
  85
  86                 argument = argument->next;
  87         }
  88         fprintf(out, ")");
  89 }
  90
  91 static void print_binary_expression(const binary_expression_t *binexpr)
  92 {
  93         fprintf(out, "(");
  94         print_expression(binexpr->left);
  95         fprintf(out, " ");
  96         switch(binexpr->type) {
  97         case BINEXPR_INVALID:            fputs("INVOP", out); break;
  98         case BINEXPR_COMMA:              fputs(",", out);     break;
  99         case BINEXPR_ASSIGN:             fputs("=", out);     break;
 100         case BINEXPR_ADD:                fputs("+", out);     break;
 101         case BINEXPR_SUB:                fputs("-", out);     break;
 102         case BINEXPR_MUL:                fputs("*", out);     break;
 103         case BINEXPR_MOD:                fputs("%", out);     break;
 104         case BINEXPR_DIV:                fputs("/", out);     break;
 105         case BINEXPR_BITWISE_OR:         fputs("|", out);     break;
 106         case BINEXPR_BITWISE_AND:        fputs("&", out);     break;
 107         case BINEXPR_BITWISE_XOR:        fputs("^", out);     break;
 108         case BINEXPR_LOGICAL_OR:         fputs("||", out);    break;
 109         case BINEXPR_LOGICAL_AND:        fputs("&&", out);    break;
 110         case BINEXPR_NOTEQUAL:           fputs("!=", out);    break;
 111         case BINEXPR_EQUAL:              fputs("==", out);    break;
 112         case BINEXPR_LESS:               fputs("<", out);     break;
 113         case BINEXPR_LESSEQUAL:          fputs("<=", out);    break;
 114         case BINEXPR_GREATER:            fputs(">", out);     break;
 115         case BINEXPR_GREATEREQUAL:       fputs(">=", out);    break;
 116         case BINEXPR_SHIFTLEFT:          fputs("<<", out);    break;
 117         case BINEXPR_SHIFTRIGHT:         fputs(">>", out);    break;
 118
 119         case BINEXPR_ADD_ASSIGN:         fputs("+=", out);    break;
 120         case BINEXPR_SUB_ASSIGN:         fputs("-=", out);    break;
 121         case BINEXPR_MUL_ASSIGN:         fputs("*=", out);    break;
 122         case BINEXPR_MOD_ASSIGN:         fputs("%=", out);    break;
 123         case BINEXPR_DIV_ASSIGN:         fputs("/=", out);    break;
 124         case BINEXPR_BITWISE_OR_ASSIGN:  fputs("|=", out);    break;
 125         case BINEXPR_BITWISE_AND_ASSIGN: fputs("&=", out);    break;
 126         case BINEXPR_BITWISE_XOR_ASSIGN: fputs("^=", out);    break;
 127         case BINEXPR_SHIFTLEFT_ASSIGN:   fputs("<<=", out);   break;
 128         case BINEXPR_SHIFTRIGHT_ASSIGN:  fputs(">>=", out);   break;
 129         }
 130         fprintf(out, " ");
 131         print_expression(binexpr->right);
 132         fprintf(out, ")");
 133 }
 134
 135 static void print_unary_expression(const unary_expression_t *unexpr)
 136 {
 137         switch(unexpr->type) {
 138         case UNEXPR_NEGATE:           fputs("-", out);  break;
 139         case UNEXPR_PLUS:             fputs("+", out);  break;
 140         case UNEXPR_NOT:              fputs("!", out);  break;
 141         case UNEXPR_BITWISE_NEGATE:   fputs("~", out);  break;
 142         case UNEXPR_PREFIX_INCREMENT: fputs("++", out); break;
 143         case UNEXPR_PREFIX_DECREMENT: fputs("--", out); break;
 144         case UNEXPR_DEREFERENCE:      fputs("*", out);  break;
 145         case UNEXPR_TAKE_ADDRESS:     fputs("&", out);  break;
 146
 147         case UNEXPR_POSTFIX_INCREMENT:
 148                 fputs("(", out);
 149                 print_expression(unexpr->value);
 150                 fputs(")", out);
 151                 fputs("++", out);
 152                 return;
 153         case UNEXPR_POSTFIX_DECREMENT:
 154                 fputs("(", out);
 155                 print_expression(unexpr->value);
 156                 fputs(")", out);
 157                 fputs("--", out);
 158                 return;
 159         case UNEXPR_CAST:
 160                 fputs("(", out);
 161                 print_type(unexpr->expression.datatype);
 162                 fputs(")", out);
 163                 break;
 164         case UNEXPR_INVALID:
 165                 fprintf(out, "unop%d", (int) unexpr->type);
 166                 break;
 167         }
 168         fputs("(", out);
 169         print_expression(unexpr->value);
 170         fputs(")", out);
 171 }
 172
 173 static void print_reference_expression(const reference_expression_t *ref)
 174 {
 175         fprintf(out, "%s", ref->declaration->symbol->string);
 176 }
 177
 178 static void print_array_expression(const array_access_expression_t *expression)
 179 {
 180         if(!expression->flipped) {
 181                 fputs("(", out);
 182                 print_expression(expression->array_ref);
 183                 fputs(")[", out);
 184                 print_expression(expression->index);
 185                 fputs("]", out);
 186         } else {
 187                 fputs("(", out);
 188                 print_expression(expression->index);
 189                 fputs(")[", out);
 190                 print_expression(expression->array_ref);
 191                 fputs("]", out);
 192         }
 193 }
 194
 195 static void print_sizeof_expression(const sizeof_expression_t *expression)
 196 {
 197         fputs("sizeof", out);
 198         if(expression->size_expression != NULL) {
 199                 fputc('(', out);
 200                 print_expression(expression->size_expression);
 201                 fputc(')', out);
 202         } else {
 203                 fputc('(', out);
 204                 print_type(expression->type);
 205                 fputc(')', out);
 206         }
 207 }
 208
 209 static void print_builtin_symbol(const builtin_symbol_expression_t *expression)
 210 {
 211         fputs(expression->symbol->string, out);
 212 }
 213
 214 static void print_conditional(const conditional_expression_t *expression)
 215 {
 216         fputs("(", out);
 217         print_expression(expression->condition);
 218         fputs(" ? ", out);
 219         print_expression(expression->true_expression);
 220         fputs(" : ", out);
 221         print_expression(expression->false_expression);
 222         fputs(")", out);
 223 }
 224
 225 static void print_va_arg(const va_arg_expression_t *expression)
 226 {
 227         fputs("__builtin_va_arg(", out);
 228         print_expression(expression->arg);
 229         fputs(", ", out);
 230         print_type(expression->expression.datatype);
 231         fputs(")", out);
 232 }
 233
 234 static void print_select(const select_expression_t *expression)
 235 {
 236         print_expression(expression->compound);
 237         if(expression->compound->base.datatype == NULL ||
 238                         expression->compound->base.datatype->type == TYPE_POINTER) {
 239                 fputs("->", out);
 240         } else {
 241                 fputc('.', out);
 242         }
 243         fputs(expression->symbol->string, out);
 244 }
 245
 246 static void print_classify_type_expression(
 247         const classify_type_expression_t *const expr)
 248 {
 249         fputs("__builtin_classify_type(", out);
 250         print_expression(expr->type_expression);
 251         fputc(')', out);
 252 }
 253
 254 void print_expression(const expression_t *expression)
 255 {
 256         switch(expression->type) {
 257         case EXPR_UNKNOWN:
 258         case EXPR_INVALID:
 259                 fprintf(out, "*invalid expression*");
 260                 break;
 261         case EXPR_CONST:
 262                 print_const(&expression->conste);
 263                 break;
 264         case EXPR_FUNCTION:
 265         case EXPR_PRETTY_FUNCTION:
 266         case EXPR_STRING_LITERAL:
 267                 print_string_literal(&expression->string_literal);
 268                 break;
 269         case EXPR_CALL:
 270                 print_call_expression((const call_expression_t*) expression);
 271                 break;
 272         case EXPR_BINARY:
 273                 print_binary_expression((const binary_expression_t*) expression);
 274                 break;
 275         case EXPR_REFERENCE:
 276                 print_reference_expression((const reference_expression_t*) expression);
 277                 break;
 278         case EXPR_ARRAY_ACCESS:
 279                 print_array_expression((const array_access_expression_t*) expression);
 280                 break;
 281         case EXPR_UNARY:
 282                 print_unary_expression((const unary_expression_t*) expression);
 283                 break;
 284         case EXPR_SIZEOF:
 285                 print_sizeof_expression((const sizeof_expression_t*) expression);
 286                 break;
 287         case EXPR_BUILTIN_SYMBOL:
 288                 print_builtin_symbol((const builtin_symbol_expression_t*) expression);
 289                 break;
 290         case EXPR_CONDITIONAL:
 291                 print_conditional((const conditional_expression_t*) expression);
 292                 break;
 293         case EXPR_VA_ARG:
 294                 print_va_arg((const va_arg_expression_t*) expression);
 295                 break;
 296         case EXPR_SELECT:
 297                 print_select((const select_expression_t*) expression);
 298                 break;
 299         case EXPR_CLASSIFY_TYPE:
 300                 print_classify_type_expression((const classify_type_expression_t*)expression);
 301                 break;
 302
 303         case EXPR_OFFSETOF:
 304         case EXPR_STATEMENT:
 305                 /* TODO */
 306                 fprintf(out, "some expression of type %d", (int) expression->type);
 307                 break;
 308         }
 309 }
 310
 311 static void print_compound_statement(const compound_statement_t *block)
 312 {
 313         fputs("{\n", out);
 314         indent++;
 315
 316         statement_t *statement = block->statements;
 317         while(statement != NULL) {
 318                 print_indent();
 319                 print_statement(statement);
 320
 321                 statement = statement->base.next;
 322         }
 323         indent--;
 324         print_indent();
 325         fputs("}\n", out);
 326 }
 327
 328 static void print_return_statement(const return_statement_t *statement)
 329 {
 330         fprintf(out, "return ");
 331         if(statement->return_value != NULL)
 332                 print_expression(statement->return_value);
 333         fputs(";\n", out);
 334 }
 335
 336 static void print_expression_statement(const expression_statement_t *statement)
 337 {
 338         print_expression(statement->expression);
 339         fputs(";\n", out);
 340 }
 341
 342 static void print_goto_statement(const goto_statement_t *statement)
 343 {
 344         fprintf(out, "goto ");
 345         fputs(statement->label->symbol->string, out);
 346         fprintf(stderr, "(%p)", (void*) statement->label);
 347         fputs(";\n", out);
 348 }
 349
 350 static void print_label_statement(const label_statement_t *statement)
 351 {
 352         fprintf(stderr, "(%p)", (void*) statement->label);
 353         fprintf(out, "%s:\n", statement->label->symbol->string);
 354         if(statement->label_statement != NULL) {
 355                 print_statement(statement->label_statement);
 356         }
 357 }
 358
 359 static void print_if_statement(const if_statement_t *statement)
 360 {
 361         fputs("if(", out);
 362         print_expression(statement->condition);
 363         fputs(") ", out);
 364         if(statement->true_statement != NULL) {
 365                 print_statement(statement->true_statement);
 366         }
 367
 368         if(statement->false_statement != NULL) {
 369                 print_indent();
 370                 fputs("else ", out);
 371                 print_statement(statement->false_statement);
 372         }
 373 }
 374
 375 static void print_switch_statement(const switch_statement_t *statement)
 376 {
 377         fputs("switch(", out);
 378         print_expression(statement->expression);
 379         fputs(") ", out);
 380         print_statement(statement->body);
 381 }
 382
 383 static void print_case_label(const case_label_statement_t *statement)
 384 {
 385         if(statement->expression == NULL) {
 386                 fputs("default:\n", out);
 387         } else {
 388                 fputs("case ", out);
 389                 print_expression(statement->expression);
 390                 fputs(":\n", out);
 391         }
 392         print_statement(statement->label_statement);
 393 }
 394
 395 static void print_declaration_statement(
 396                 const declaration_statement_t *statement)
 397 {
 398         int first = 1;
 399         declaration_t *declaration = statement->declarations_begin;
 400         for( ; declaration != statement->declarations_end->next;
 401                declaration = declaration->next) {
 402                 if(!first) {
 403                         print_indent();
 404                 } else {
 405                         first = 0;
 406                 }
 407                 print_declaration(declaration);
 408                 fputc('\n', out);
 409         }
 410 }
 411
 412 static void print_while_statement(const while_statement_t *statement)
 413 {
 414         fputs("while(", out);
 415         print_expression(statement->condition);
 416         fputs(") ", out);
 417         print_statement(statement->body);
 418 }
 419
 420 static void print_do_while_statement(const do_while_statement_t *statement)
 421 {
 422         fputs("do ", out);
 423         print_statement(statement->body);
 424         print_indent();
 425         fputs("while(", out);
 426         print_expression(statement->condition);
 427         fputs(");\n", out);
 428 }
 429
 430 static void print_for_statement(const for_statement_t *statement)
 431 {
 432         fputs("for(", out);
 433         if(statement->context.declarations != NULL) {
 434                 assert(statement->initialisation == NULL);
 435                 print_declaration(statement->context.declarations);
 436                 if(statement->context.declarations->next != NULL) {
 437                         panic("multiple declarations in for statement not supported yet");
 438                 }
 439                 fputc(' ', out);
 440         } else {
 441                 if(statement->initialisation) {
 442                         print_expression(statement->initialisation);
 443                 }
 444                 fputs("; ", out);
 445         }
 446         if(statement->condition != NULL) {
 447                 print_expression(statement->condition);
 448         }
 449         fputs("; ", out);
 450         if(statement->step != NULL) {
 451                 print_expression(statement->step);
 452         }
 453         fputs(")", out);
 454         print_statement(statement->body);
 455 }
 456
 457 void print_statement(const statement_t *statement)
 458 {
 459         switch(statement->type) {
 460         case STATEMENT_COMPOUND:
 461                 print_compound_statement((const compound_statement_t*) statement);
 462                 break;
 463         case STATEMENT_RETURN:
 464                 print_return_statement((const return_statement_t*) statement);
 465                 break;
 466         case STATEMENT_EXPRESSION:
 467                 print_expression_statement((const expression_statement_t*) statement);
 468                 break;
 469         case STATEMENT_LABEL:
 470                 print_label_statement((const label_statement_t*) statement);
 471                 break;
 472         case STATEMENT_GOTO:
 473                 print_goto_statement((const goto_statement_t*) statement);
 474                 break;
 475         case STATEMENT_CONTINUE:
 476                 fputs("continue;\n", out);
 477                 break;
 478         case STATEMENT_BREAK:
 479                 fputs("break;\n", out);
 480                 break;
 481         case STATEMENT_IF:
 482                 print_if_statement((const if_statement_t*) statement);
 483                 break;
 484         case STATEMENT_SWITCH:
 485                 print_switch_statement((const switch_statement_t*) statement);
 486                 break;
 487         case STATEMENT_CASE_LABEL:
 488                 print_case_label((const case_label_statement_t*) statement);
 489                 break;
 490         case STATEMENT_DECLARATION:
 491                 print_declaration_statement((const declaration_statement_t*) statement);
 492                 break;
 493         case STATEMENT_WHILE:
 494                 print_while_statement((const while_statement_t*) statement);
 495                 break;
 496         case STATEMENT_DO_WHILE:
 497                 print_do_while_statement((const do_while_statement_t*) statement);
 498                 break;
 499         case STATEMENT_FOR:
 500                 print_for_statement((const for_statement_t*) statement);
 501                 break;
 502         case STATEMENT_INVALID:
 503                 fprintf(out, "*invalid statement*");
 504                 break;
 505         }
 506 }
 507
 508 static void print_storage_class(storage_class_t storage_class)
 509 {
 510         switch(storage_class) {
 511         case STORAGE_CLASS_ENUM_ENTRY:
 512         case STORAGE_CLASS_NONE:
 513                 break;
 514         case STORAGE_CLASS_TYPEDEF:  fputs("typedef ", out); break;
 515         case STORAGE_CLASS_EXTERN:   fputs("extern ", out); break;
 516         case STORAGE_CLASS_STATIC:   fputs("static ", out); break;
 517         case STORAGE_CLASS_AUTO:     fputs("auto ", out); break;
 518         case STORAGE_CLASS_REGISTER: fputs("register ", out); break;
 519         }
 520 }
 521
 522 void print_initializer(const initializer_t *initializer)
 523 {
 524         if(initializer->type == INITIALIZER_VALUE) {
 525                 const initializer_value_t *value = &initializer->value;
 526                 print_expression(value->value);
 527                 return;
 528         }
 529
 530         assert(initializer->type == INITIALIZER_LIST);
 531         fputs("{ ", out);
 532         const initializer_list_t *list = &initializer->list;
 533
 534         for(size_t i = 0 ; i < list->len; ++i) {
 535                 if(i > 0) {
 536                         fputs(", ", out);
 537                 }
 538                 print_initializer(list->initializers[i]);
 539         }
 540         fputs("}", out);
 541 }
 542
 543 static void print_normal_declaration(const declaration_t *declaration)
 544 {
 545         print_storage_class((storage_class_t)declaration->storage_class);
 546         print_type_ext(declaration->type, declaration->symbol,
 547                        &declaration->context);
 548         if(declaration->is_inline) {
 549                 fputs("inline ", out);
 550         }
 551
 552         if(declaration->type->type == TYPE_FUNCTION) {
 553                 if(declaration->init.statement != NULL) {
 554                         fputs("\n", out);
 555                         print_statement(declaration->init.statement);
 556                         return;
 557                 }
 558         } else if(declaration->init.initializer != NULL) {
 559                 fputs(" = ", out);
 560                 print_initializer(declaration->init.initializer);
 561         }
 562         fputc(';', out);
 563 }
 564
 565 void print_declaration(const declaration_t *declaration)
 566 {
 567         if(declaration->namespc != NAMESPACE_NORMAL &&
 568                         declaration->symbol == NULL)
 569                 return;
 570
 571         switch(declaration->namespc) {
 572         case NAMESPACE_NORMAL:
 573                 print_normal_declaration(declaration);
 574                 break;
 575         case NAMESPACE_STRUCT:
 576                 fputs("struct ", out);
 577                 fputs(declaration->symbol->string, out);
 578                 fputc(' ', out);
 579                 print_compound_definition(declaration);
 580                 fputc(';', out);
 581                 break;
 582         case NAMESPACE_UNION:
 583                 fputs("union ", out);
 584                 fputs(declaration->symbol->string, out);
 585                 fputc(' ', out);
 586                 print_compound_definition(declaration);
 587                 fputc(';', out);
 588                 break;
 589         case NAMESPACE_ENUM:
 590                 fputs("enum ", out);
 591                 fputs(declaration->symbol->string, out);
 592                 fputc(' ', out);
 593                 print_enum_definition(declaration);
 594                 fputc(';', out);
 595                 break;
 596         }
 597 }
 598
 599 void print_ast(const translation_unit_t *unit)
 600 {
 601         inc_type_visited();
 602         set_print_compound_entries(true);
 603
 604         declaration_t *declaration = unit->context.declarations;
 605         for( ; declaration != NULL; declaration = declaration->next) {
 606                 if(declaration->storage_class == STORAGE_CLASS_ENUM_ENTRY)
 607                         continue;
 608                 if(declaration->namespc != NAMESPACE_NORMAL &&
 609                                 declaration->symbol == NULL)
 610                         continue;
 611
 612                 print_indent();
 613                 print_declaration(declaration);
 614                 fputc('\n', out);
 615         }
 616 }
 617
 618 void init_ast(void)
 619 {
 620         obstack_init(&ast_obstack);
 621 }
 622
 623 void exit_ast(void)
 624 {
 625         obstack_free(&ast_obstack, NULL);
 626 }
 627
 628 void ast_set_output(FILE *stream)
 629 {
 630         out = stream;
 631         type_set_output(stream);
 632 }
 633
 634 void* (allocate_ast) (size_t size)
 635 {
 636         return _allocate_ast(size);
 637 }