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_t *cnst)
  33 {
  34         if(cnst->expression.datatype == NULL)
  35                 return;
  36
  37         if(is_type_integer(cnst->expression.datatype)) {
  38                 fprintf(out, "%d", 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(const string_literal_t *string_literal)
  45 {
  46         fputc('"', out);
  47         for(const char *c = string_literal->value; *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_call_expression(const call_expression_t *call)
  72 {
  73         print_expression(call->function);
  74         fprintf(out, "(");
  75         call_argument_t *argument = call->arguments;
  76         int              first    = 1;
  77         while(argument != NULL) {
  78                 if(!first) {
  79                         fprintf(out, ", ");
  80                 } else {
  81                         first = 0;
  82                 }
  83                 print_expression(argument->expression);
  84
  85                 argument = argument->next;
  86         }
  87         fprintf(out, ")");
  88 }
  89
  90 static void print_binary_expression(const binary_expression_t *binexpr)
  91 {
  92         fprintf(out, "(");
  93         print_expression(binexpr->left);
  94         fprintf(out, " ");
  95         switch(binexpr->type) {
  96         case BINEXPR_INVALID:            fputs("INVOP", out); break;
  97         case BINEXPR_COMMA:              fputs(",", out);     break;
  98         case BINEXPR_ASSIGN:             fputs("=", out);     break;
  99         case BINEXPR_ADD:                fputs("+", out);     break;
 100         case BINEXPR_SUB:                fputs("-", out);     break;
 101         case BINEXPR_MUL:                fputs("*", out);     break;
 102         case BINEXPR_MOD:                fputs("%", out);     break;
 103         case BINEXPR_DIV:                fputs("/", out);     break;
 104         case BINEXPR_BITWISE_OR:         fputs("|", out);     break;
 105         case BINEXPR_BITWISE_AND:        fputs("&", out);     break;
 106         case BINEXPR_BITWISE_XOR:        fputs("^", out);     break;
 107         case BINEXPR_LOGICAL_OR:         fputs("||", out);    break;
 108         case BINEXPR_LOGICAL_AND:        fputs("&&", out);    break;
 109         case BINEXPR_NOTEQUAL:           fputs("!=", out);    break;
 110         case BINEXPR_EQUAL:              fputs("==", out);    break;
 111         case BINEXPR_LESS:               fputs("<", out);     break;
 112         case BINEXPR_LESSEQUAL:          fputs("<=", out);    break;
 113         case BINEXPR_GREATER:            fputs(">", out);     break;
 114         case BINEXPR_GREATEREQUAL:       fputs(">=", out);    break;
 115         case BINEXPR_SHIFTLEFT:          fputs("<<", out);    break;
 116         case BINEXPR_SHIFTRIGHT:         fputs(">>", out);    break;
 117
 118         case BINEXPR_ADD_ASSIGN:         fputs("+=", out);    break;
 119         case BINEXPR_SUB_ASSIGN:         fputs("-=", out);    break;
 120         case BINEXPR_MUL_ASSIGN:         fputs("*=", out);    break;
 121         case BINEXPR_MOD_ASSIGN:         fputs("%=", out);    break;
 122         case BINEXPR_DIV_ASSIGN:         fputs("/=", out);    break;
 123         case BINEXPR_BITWISE_OR_ASSIGN:  fputs("|=", out);    break;
 124         case BINEXPR_BITWISE_AND_ASSIGN: fputs("&=", out);    break;
 125         case BINEXPR_BITWISE_XOR_ASSIGN: fputs("^=", out);    break;
 126         case BINEXPR_SHIFTLEFT_ASSIGN:   fputs("<<=", out);   break;
 127         case BINEXPR_SHIFTRIGHT_ASSIGN:  fputs(">>=", out);   break;
 128         }
 129         fprintf(out, " ");
 130         print_expression(binexpr->right);
 131         fprintf(out, ")");
 132 }
 133
 134 static void print_unary_expression(const unary_expression_t *unexpr)
 135 {
 136         switch(unexpr->type) {
 137         case UNEXPR_NEGATE:           fputs("-", out);  break;
 138         case UNEXPR_PLUS:             fputs("+", out);  break;
 139         case UNEXPR_NOT:              fputs("!", out);  break;
 140         case UNEXPR_BITWISE_NEGATE:   fputs("~", out);  break;
 141         case UNEXPR_PREFIX_INCREMENT: fputs("++", out); break;
 142         case UNEXPR_PREFIX_DECREMENT: fputs("--", out); break;
 143         case UNEXPR_DEREFERENCE:      fputs("*", out);  break;
 144         case UNEXPR_TAKE_ADDRESS:     fputs("&", out);  break;
 145
 146         case UNEXPR_POSTFIX_INCREMENT:
 147                 fputs("(", out);
 148                 print_expression(unexpr->value);
 149                 fputs(")", out);
 150                 fputs("++", out);
 151                 return;
 152         case UNEXPR_POSTFIX_DECREMENT:
 153                 fputs("(", out);
 154                 print_expression(unexpr->value);
 155                 fputs(")", out);
 156                 fputs("--", out);
 157                 return;
 158         case UNEXPR_CAST:
 159                 fputs("(", out);
 160                 print_type(unexpr->expression.datatype);
 161                 fputs(")", out);
 162                 break;
 163         case UNEXPR_INVALID:
 164                 fprintf(out, "unop%d", unexpr->type);
 165                 break;
 166         }
 167         fputs("(", out);
 168         print_expression(unexpr->value);
 169         fputs(")", out);
 170 }
 171
 172 static void print_reference_expression(const reference_expression_t *ref)
 173 {
 174         fprintf(out, "%s", ref->declaration->symbol->string);
 175 }
 176
 177 static void print_array_expression(const array_access_expression_t *expression)
 178 {
 179         fputs("(", out);
 180         print_expression(expression->array_ref);
 181         fputs(")[", out);
 182         print_expression(expression->index);
 183         fputs("]", out);
 184 }
 185
 186 static void print_sizeof_expression(const sizeof_expression_t *expression)
 187 {
 188         fputs("sizeof", out);
 189         if(expression->size_expression != NULL) {
 190                 fputc('(', out);
 191                 print_expression(expression->size_expression);
 192                 fputc(')', out);
 193         } else {
 194                 fputc('(', out);
 195                 print_type(expression->type);
 196                 fputc(')', out);
 197         }
 198 }
 199
 200 static void print_builtin_symbol(const builtin_symbol_expression_t *expression)
 201 {
 202         fputs(expression->symbol->string, out);
 203 }
 204
 205 static void print_conditional(const conditional_expression_t *expression)
 206 {
 207         fputs("(", out);
 208         print_expression(expression->condition);
 209         fputs(" ? ", out);
 210         print_expression(expression->true_expression);
 211         fputs(" : ", out);
 212         print_expression(expression->false_expression);
 213         fputs(")", out);
 214 }
 215
 216 static void print_va_arg(const va_arg_expression_t *expression)
 217 {
 218         fputs("__builtin_va_arg(", out);
 219         print_expression(expression->arg);
 220         fputs(", ", out);
 221         print_type(expression->expression.datatype);
 222         fputs(")", out);
 223 }
 224
 225 static void print_select(const select_expression_t *expression)
 226 {
 227         print_expression(expression->compound);
 228         if(expression->compound->datatype == NULL ||
 229                         expression->compound->datatype->type == TYPE_POINTER) {
 230                 fputs("->", out);
 231         } else {
 232                 fputc('.', out);
 233         }
 234         fputs(expression->symbol->string, out);
 235 }
 236
 237 void print_expression(const expression_t *expression)
 238 {
 239         switch(expression->type) {
 240         case EXPR_INVALID:
 241                 fprintf(out, "*invalid expression*");
 242                 break;
 243         case EXPR_CONST:
 244                 print_const((const const_t*) expression);
 245                 break;
 246         case EXPR_FUNCTION:
 247         case EXPR_PRETTY_FUNCTION:
 248         case EXPR_STRING_LITERAL:
 249                 print_string_literal((const string_literal_t*) expression);
 250                 break;
 251         case EXPR_CALL:
 252                 print_call_expression((const call_expression_t*) expression);
 253                 break;
 254         case EXPR_BINARY:
 255                 print_binary_expression((const binary_expression_t*) expression);
 256                 break;
 257         case EXPR_REFERENCE:
 258                 print_reference_expression((const reference_expression_t*) expression);
 259                 break;
 260         case EXPR_ARRAY_ACCESS:
 261                 print_array_expression((const array_access_expression_t*) expression);
 262                 break;
 263         case EXPR_UNARY:
 264                 print_unary_expression((const unary_expression_t*) expression);
 265                 break;
 266         case EXPR_SIZEOF:
 267                 print_sizeof_expression((const sizeof_expression_t*) expression);
 268                 break;
 269         case EXPR_BUILTIN_SYMBOL:
 270                 print_builtin_symbol((const builtin_symbol_expression_t*) expression);
 271                 break;
 272         case EXPR_CONDITIONAL:
 273                 print_conditional((const conditional_expression_t*) expression);
 274                 break;
 275         case EXPR_VA_ARG:
 276                 print_va_arg((const va_arg_expression_t*) expression);
 277                 break;
 278         case EXPR_SELECT:
 279                 print_select((const select_expression_t*) expression);
 280                 break;
 281
 282         case EXPR_OFFSETOF:
 283         case EXPR_STATEMENT:
 284                 /* TODO */
 285                 fprintf(out, "some expression of type %d", expression->type);
 286                 break;
 287         }
 288 }
 289
 290 static void print_compound_statement(const compound_statement_t *block)
 291 {
 292         fputs("{\n", out);
 293         indent++;
 294
 295         statement_t *statement = block->statements;
 296         while(statement != NULL) {
 297                 print_indent();
 298                 print_statement(statement);
 299
 300                 statement = statement->next;
 301         }
 302         indent--;
 303         print_indent();
 304         fputs("}\n", out);
 305 }
 306
 307 static void print_return_statement(const return_statement_t *statement)
 308 {
 309         fprintf(out, "return ");
 310         if(statement->return_value != NULL)
 311                 print_expression(statement->return_value);
 312         fputs(";\n", out);
 313 }
 314
 315 static void print_expression_statement(const expression_statement_t *statement)
 316 {
 317         print_expression(statement->expression);
 318         fputs(";\n", out);
 319 }
 320
 321 static void print_goto_statement(const goto_statement_t *statement)
 322 {
 323         fprintf(out, "goto ");
 324         if(statement->label != NULL) {
 325                 fprintf(out, "%s", statement->label->symbol->string);
 326         } else {
 327                 fprintf(out, "?%s", statement->label_symbol->string);
 328         }
 329         fputs(";\n", out);
 330 }
 331
 332 static void print_label_statement(const label_statement_t *statement)
 333 {
 334         fprintf(out, "%s:\n", statement->symbol->string);
 335 }
 336
 337 static void print_if_statement(const if_statement_t *statement)
 338 {
 339         fputs("if(", out);
 340         print_expression(statement->condition);
 341         fputs(") ", out);
 342         if(statement->true_statement != NULL) {
 343                 print_statement(statement->true_statement);
 344         }
 345
 346         if(statement->false_statement != NULL) {
 347                 print_indent();
 348                 fputs("else ", out);
 349                 print_statement(statement->false_statement);
 350         }
 351 }
 352
 353 static void print_switch_statement(const switch_statement_t *statement)
 354 {
 355         fputs("switch(", out);
 356         print_expression(statement->expression);
 357         fputs(") ", out);
 358         print_statement(statement->body);
 359 }
 360
 361 static void print_case_label(const case_label_statement_t *statement)
 362 {
 363         if(statement->expression == NULL) {
 364                 fputs("default:\n", out);
 365         } else {
 366                 fputs("case ", out);
 367                 print_expression(statement->expression);
 368                 fputs(":\n", out);
 369         }
 370 }
 371
 372 static void print_declaration_statement(
 373                 const declaration_statement_t *statement)
 374 {
 375         int first = 1;
 376         declaration_t *declaration = statement->declarations_begin;
 377         for( ; declaration != statement->declarations_end->next;
 378                declaration = declaration->next) {
 379                 if(!first) {
 380                         print_indent();
 381                 } else {
 382                         first = 0;
 383                 }
 384                 print_declaration(declaration);
 385                 fputc('\n', out);
 386         }
 387 }
 388
 389 static void print_while_statement(const while_statement_t *statement)
 390 {
 391         fputs("while(", out);
 392         print_expression(statement->condition);
 393         fputs(") ", out);
 394         print_statement(statement->body);
 395 }
 396
 397 static void print_do_while_statement(const do_while_statement_t *statement)
 398 {
 399         fputs("do ", out);
 400         print_statement(statement->body);
 401         print_indent();
 402         fputs("while(", out);
 403         print_expression(statement->condition);
 404         fputs(");\n", out);
 405 }
 406
 407 static void print_for_statement(const for_statement_t *statement)
 408 {
 409         fputs("for(", out);
 410         if(statement->context.declarations != NULL) {
 411                 assert(statement->initialisation == NULL);
 412                 print_declaration(statement->context.declarations);
 413                 if(statement->context.declarations->next != NULL) {
 414                         panic("multiple declarations in for statement not supported yet");
 415                 }
 416                 fputc(' ', out);
 417         } else if(statement->initialisation) {
 418                 print_expression(statement->initialisation);
 419                 fputs("; ", out);
 420         }
 421         if(statement->condition != NULL) {
 422                 print_expression(statement->condition);
 423         }
 424         fputs("; ", out);
 425         if(statement->step != NULL) {
 426                 print_expression(statement->step);
 427         }
 428         fputs(")", out);
 429         print_statement(statement->body);
 430 }
 431
 432 void print_statement(const statement_t *statement)
 433 {
 434         switch(statement->type) {
 435         case STATEMENT_COMPOUND:
 436                 print_compound_statement((const compound_statement_t*) statement);
 437                 break;
 438         case STATEMENT_RETURN:
 439                 print_return_statement((const return_statement_t*) statement);
 440                 break;
 441         case STATEMENT_EXPRESSION:
 442                 print_expression_statement((const expression_statement_t*) statement);
 443                 break;
 444         case STATEMENT_LABEL:
 445                 print_label_statement((const label_statement_t*) statement);
 446                 break;
 447         case STATEMENT_GOTO:
 448                 print_goto_statement((const goto_statement_t*) statement);
 449                 break;
 450         case STATEMENT_CONTINUE:
 451                 fputs("continue;\n", out);
 452                 break;
 453         case STATEMENT_BREAK:
 454                 fputs("break;\n", out);
 455                 break;
 456         case STATEMENT_IF:
 457                 print_if_statement((const if_statement_t*) statement);
 458                 break;
 459         case STATEMENT_SWITCH:
 460                 print_switch_statement((const switch_statement_t*) statement);
 461                 break;
 462         case STATEMENT_CASE_LABEL:
 463                 print_case_label((const case_label_statement_t*) statement);
 464                 break;
 465         case STATEMENT_DECLARATION:
 466                 print_declaration_statement((const declaration_statement_t*) statement);
 467                 break;
 468         case STATEMENT_WHILE:
 469                 print_while_statement((const while_statement_t*) statement);
 470                 break;
 471         case STATEMENT_DO_WHILE:
 472                 print_do_while_statement((const do_while_statement_t*) statement);
 473                 break;
 474         case STATEMENT_FOR:
 475                 print_for_statement((const for_statement_t*) statement);
 476                 break;
 477         case STATEMENT_INVALID:
 478                 fprintf(out, "*invalid statement*");
 479                 break;
 480         }
 481 }
 482
 483 static void print_storage_class(storage_class_t storage_class)
 484 {
 485         switch(storage_class) {
 486         case STORAGE_CLASS_ENUM_ENTRY:
 487         case STORAGE_CLASS_NONE:
 488                 break;
 489         case STORAGE_CLASS_TYPEDEF:  fputs("typedef ", out); break;
 490         case STORAGE_CLASS_EXTERN:   fputs("extern ", out); break;
 491         case STORAGE_CLASS_STATIC:   fputs("static ", out); break;
 492         case STORAGE_CLASS_AUTO:     fputs("auto ", out); break;
 493         case STORAGE_CLASS_REGISTER: fputs("register ", out); break;
 494         }
 495 }
 496
 497 void print_initializer(const initializer_t *initializer)
 498 {
 499         if(initializer->type == INITIALIZER_VALUE) {
 500                 print_expression(initializer->v.value);
 501                 return;
 502         }
 503
 504         assert(initializer->type == INITIALIZER_LIST);
 505         fputs("{ ", out);
 506         initializer_t *iter = initializer->v.list;
 507         for( ; iter != NULL; iter = iter->next) {
 508                 print_initializer(iter);
 509                 if(iter->next != NULL) {
 510                         fputs(", ", out);
 511                 }
 512         }
 513         fputs("}", out);
 514 }
 515
 516 static void print_normal_declaration(const declaration_t *declaration)
 517 {
 518         print_storage_class(declaration->storage_class);
 519         print_type_ext(declaration->type, declaration->symbol,
 520                        &declaration->context);
 521         if(declaration->type->type == TYPE_FUNCTION) {
 522                 if(declaration->init.statement != NULL) {
 523                         fputs("\n", out);
 524                         print_statement(declaration->init.statement);
 525                         return;
 526                 }
 527         } else if(declaration->init.initializer != NULL) {
 528                 fputs(" = ", out);
 529                 print_initializer(declaration->init.initializer);
 530         }
 531         fputc(';', out);
 532 }
 533
 534 void print_declaration(const declaration_t *declaration)
 535 {
 536         if(declaration->namespace != NAMESPACE_NORMAL &&
 537                         declaration->symbol == NULL)
 538                 return;
 539
 540         switch(declaration->namespace) {
 541         case NAMESPACE_NORMAL:
 542                 print_normal_declaration(declaration);
 543                 break;
 544         case NAMESPACE_STRUCT:
 545                 fputs("struct ", out);
 546                 fputs(declaration->symbol->string, out);
 547                 fputc(' ', out);
 548                 print_compound_definition(declaration);
 549                 fputc(';', out);
 550                 break;
 551         case NAMESPACE_UNION:
 552                 fputs("union ", out);
 553                 fputs(declaration->symbol->string, out);
 554                 fputc(' ', out);
 555                 print_compound_definition(declaration);
 556                 fputc(';', out);
 557                 break;
 558         case NAMESPACE_ENUM:
 559                 fputs("enum ", out);
 560                 fputs(declaration->symbol->string, out);
 561                 fputc(' ', out);
 562                 print_enum_definition(declaration);
 563                 fputc(';', out);
 564                 break;
 565         }
 566 }
 567
 568 void print_ast(const translation_unit_t *unit)
 569 {
 570         inc_type_visited();
 571         set_print_compound_entries(true);
 572
 573         declaration_t *declaration = unit->context.declarations;
 574         for( ; declaration != NULL; declaration = declaration->next) {
 575                 if(declaration->storage_class == STORAGE_CLASS_ENUM_ENTRY)
 576                         continue;
 577                 if(declaration->namespace != NAMESPACE_NORMAL &&
 578                                 declaration->symbol == NULL)
 579                         continue;
 580
 581                 print_indent();
 582                 print_declaration(declaration);
 583                 fputc('\n', out);
 584         }
 585 }
 586
 587 void init_ast(void)
 588 {
 589         obstack_init(&ast_obstack);
 590 }
 591
 592 void exit_ast(void)
 593 {
 594         obstack_free(&ast_obstack, NULL);
 595 }
 596
 597 void ast_set_output(FILE *stream)
 598 {
 599         out = stream;
 600         type_set_output(stream);
 601 }
 602
 603 void* (allocate_ast) (size_t size)
 604 {
 605         return _allocate_ast(size);
 606 }