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_UNKNOWN:
 241         case EXPR_INVALID:
 242                 fprintf(out, "*invalid expression*");
 243                 break;
 244         case EXPR_CONST:
 245                 print_const((const const_t*) expression);
 246                 break;
 247         case EXPR_FUNCTION:
 248         case EXPR_PRETTY_FUNCTION:
 249         case EXPR_STRING_LITERAL:
 250                 print_string_literal((const string_literal_t*) expression);
 251                 break;
 252         case EXPR_CALL:
 253                 print_call_expression((const call_expression_t*) expression);
 254                 break;
 255         case EXPR_BINARY:
 256                 print_binary_expression((const binary_expression_t*) expression);
 257                 break;
 258         case EXPR_REFERENCE:
 259                 print_reference_expression((const reference_expression_t*) expression);
 260                 break;
 261         case EXPR_ARRAY_ACCESS:
 262                 print_array_expression((const array_access_expression_t*) expression);
 263                 break;
 264         case EXPR_UNARY:
 265                 print_unary_expression((const unary_expression_t*) expression);
 266                 break;
 267         case EXPR_SIZEOF:
 268                 print_sizeof_expression((const sizeof_expression_t*) expression);
 269                 break;
 270         case EXPR_BUILTIN_SYMBOL:
 271                 print_builtin_symbol((const builtin_symbol_expression_t*) expression);
 272                 break;
 273         case EXPR_CONDITIONAL:
 274                 print_conditional((const conditional_expression_t*) expression);
 275                 break;
 276         case EXPR_VA_ARG:
 277                 print_va_arg((const va_arg_expression_t*) expression);
 278                 break;
 279         case EXPR_SELECT:
 280                 print_select((const select_expression_t*) expression);
 281                 break;
 282
 283         case EXPR_OFFSETOF:
 284         case EXPR_STATEMENT:
 285                 /* TODO */
 286                 fprintf(out, "some expression of type %d", expression->type);
 287                 break;
 288         }
 289 }
 290
 291 static void print_compound_statement(const compound_statement_t *block)
 292 {
 293         fputs("{\n", out);
 294         indent++;
 295
 296         statement_t *statement = block->statements;
 297         while(statement != NULL) {
 298                 print_indent();
 299                 print_statement(statement);
 300
 301                 statement = statement->next;
 302         }
 303         indent--;
 304         print_indent();
 305         fputs("}\n", out);
 306 }
 307
 308 static void print_return_statement(const return_statement_t *statement)
 309 {
 310         fprintf(out, "return ");
 311         if(statement->return_value != NULL)
 312                 print_expression(statement->return_value);
 313         fputs(";\n", out);
 314 }
 315
 316 static void print_expression_statement(const expression_statement_t *statement)
 317 {
 318         print_expression(statement->expression);
 319         fputs(";\n", out);
 320 }
 321
 322 static void print_goto_statement(const goto_statement_t *statement)
 323 {
 324         fprintf(out, "goto ");
 325         fputs(statement->label->symbol->string, out);
 326         fprintf(stderr, "(%p)", (void*) statement->label);
 327         fputs(";\n", out);
 328 }
 329
 330 static void print_label_statement(const label_statement_t *statement)
 331 {
 332         fprintf(stderr, "(%p)", (void*) statement->label);
 333         fprintf(out, "%s:\n", statement->label->symbol->string);
 334         if(statement->label_statement != NULL) {
 335                 print_statement(statement->label_statement);
 336         }
 337 }
 338
 339 static void print_if_statement(const if_statement_t *statement)
 340 {
 341         fputs("if(", out);
 342         print_expression(statement->condition);
 343         fputs(") ", out);
 344         if(statement->true_statement != NULL) {
 345                 print_statement(statement->true_statement);
 346         }
 347
 348         if(statement->false_statement != NULL) {
 349                 print_indent();
 350                 fputs("else ", out);
 351                 print_statement(statement->false_statement);
 352         }
 353 }
 354
 355 static void print_switch_statement(const switch_statement_t *statement)
 356 {
 357         fputs("switch(", out);
 358         print_expression(statement->expression);
 359         fputs(") ", out);
 360         print_statement(statement->body);
 361 }
 362
 363 static void print_case_label(const case_label_statement_t *statement)
 364 {
 365         if(statement->expression == NULL) {
 366                 fputs("default:\n", out);
 367         } else {
 368                 fputs("case ", out);
 369                 print_expression(statement->expression);
 370                 fputs(":\n", out);
 371         }
 372 }
 373
 374 static void print_declaration_statement(
 375                 const declaration_statement_t *statement)
 376 {
 377         int first = 1;
 378         declaration_t *declaration = statement->declarations_begin;
 379         for( ; declaration != statement->declarations_end->next;
 380                declaration = declaration->next) {
 381                 if(!first) {
 382                         print_indent();
 383                 } else {
 384                         first = 0;
 385                 }
 386                 print_declaration(declaration);
 387                 fputc('\n', out);
 388         }
 389 }
 390
 391 static void print_while_statement(const while_statement_t *statement)
 392 {
 393         fputs("while(", out);
 394         print_expression(statement->condition);
 395         fputs(") ", out);
 396         print_statement(statement->body);
 397 }
 398
 399 static void print_do_while_statement(const do_while_statement_t *statement)
 400 {
 401         fputs("do ", out);
 402         print_statement(statement->body);
 403         print_indent();
 404         fputs("while(", out);
 405         print_expression(statement->condition);
 406         fputs(");\n", out);
 407 }
 408
 409 static void print_for_statement(const for_statement_t *statement)
 410 {
 411         fputs("for(", out);
 412         if(statement->context.declarations != NULL) {
 413                 assert(statement->initialisation == NULL);
 414                 print_declaration(statement->context.declarations);
 415                 if(statement->context.declarations->next != NULL) {
 416                         panic("multiple declarations in for statement not supported yet");
 417                 }
 418                 fputc(' ', out);
 419         } else {
 420                 if(statement->initialisation) {
 421                         print_expression(statement->initialisation);
 422                 }
 423                 fputs("; ", out);
 424         }
 425         if(statement->condition != NULL) {
 426                 print_expression(statement->condition);
 427         }
 428         fputs("; ", out);
 429         if(statement->step != NULL) {
 430                 print_expression(statement->step);
 431         }
 432         fputs(")", out);
 433         print_statement(statement->body);
 434 }
 435
 436 void print_statement(const statement_t *statement)
 437 {
 438         switch(statement->type) {
 439         case STATEMENT_COMPOUND:
 440                 print_compound_statement((const compound_statement_t*) statement);
 441                 break;
 442         case STATEMENT_RETURN:
 443                 print_return_statement((const return_statement_t*) statement);
 444                 break;
 445         case STATEMENT_EXPRESSION:
 446                 print_expression_statement((const expression_statement_t*) statement);
 447                 break;
 448         case STATEMENT_LABEL:
 449                 print_label_statement((const label_statement_t*) statement);
 450                 break;
 451         case STATEMENT_GOTO:
 452                 print_goto_statement((const goto_statement_t*) statement);
 453                 break;
 454         case STATEMENT_CONTINUE:
 455                 fputs("continue;\n", out);
 456                 break;
 457         case STATEMENT_BREAK:
 458                 fputs("break;\n", out);
 459                 break;
 460         case STATEMENT_IF:
 461                 print_if_statement((const if_statement_t*) statement);
 462                 break;
 463         case STATEMENT_SWITCH:
 464                 print_switch_statement((const switch_statement_t*) statement);
 465                 break;
 466         case STATEMENT_CASE_LABEL:
 467                 print_case_label((const case_label_statement_t*) statement);
 468                 break;
 469         case STATEMENT_DECLARATION:
 470                 print_declaration_statement((const declaration_statement_t*) statement);
 471                 break;
 472         case STATEMENT_WHILE:
 473                 print_while_statement((const while_statement_t*) statement);
 474                 break;
 475         case STATEMENT_DO_WHILE:
 476                 print_do_while_statement((const do_while_statement_t*) statement);
 477                 break;
 478         case STATEMENT_FOR:
 479                 print_for_statement((const for_statement_t*) statement);
 480                 break;
 481         case STATEMENT_INVALID:
 482                 fprintf(out, "*invalid statement*");
 483                 break;
 484         }
 485 }
 486
 487 static void print_storage_class(storage_class_t storage_class)
 488 {
 489         switch(storage_class) {
 490         case STORAGE_CLASS_ENUM_ENTRY:
 491         case STORAGE_CLASS_NONE:
 492                 break;
 493         case STORAGE_CLASS_TYPEDEF:  fputs("typedef ", out); break;
 494         case STORAGE_CLASS_EXTERN:   fputs("extern ", out); break;
 495         case STORAGE_CLASS_STATIC:   fputs("static ", out); break;
 496         case STORAGE_CLASS_AUTO:     fputs("auto ", out); break;
 497         case STORAGE_CLASS_REGISTER: fputs("register ", out); break;
 498         }
 499 }
 500
 501 void print_initializer(const initializer_t *initializer)
 502 {
 503         if(initializer->type == INITIALIZER_VALUE) {
 504                 print_expression(initializer->v.value);
 505                 return;
 506         }
 507
 508         assert(initializer->type == INITIALIZER_LIST);
 509         fputs("{ ", out);
 510         initializer_t *iter = initializer->v.list;
 511         for( ; iter != NULL; iter = iter->next) {
 512                 print_initializer(iter);
 513                 if(iter->next != NULL) {
 514                         fputs(", ", out);
 515                 }
 516         }
 517         fputs("}", out);
 518 }
 519
 520 static void print_normal_declaration(const declaration_t *declaration)
 521 {
 522         print_storage_class(declaration->storage_class);
 523         print_type_ext(declaration->type, declaration->symbol,
 524                        &declaration->context);
 525         if(declaration->is_inline) {
 526                 fputs("inline ", out);
 527         }
 528
 529         if(declaration->type->type == TYPE_FUNCTION) {
 530                 if(declaration->init.statement != NULL) {
 531                         fputs("\n", out);
 532                         print_statement(declaration->init.statement);
 533                         return;
 534                 }
 535         } else if(declaration->init.initializer != NULL) {
 536                 fputs(" = ", out);
 537                 print_initializer(declaration->init.initializer);
 538         }
 539         fputc(';', out);
 540 }
 541
 542 void print_declaration(const declaration_t *declaration)
 543 {
 544         if(declaration->namespace != NAMESPACE_NORMAL &&
 545                         declaration->symbol == NULL)
 546                 return;
 547
 548         switch(declaration->namespace) {
 549         case NAMESPACE_NORMAL:
 550                 print_normal_declaration(declaration);
 551                 break;
 552         case NAMESPACE_STRUCT:
 553                 fputs("struct ", out);
 554                 fputs(declaration->symbol->string, out);
 555                 fputc(' ', out);
 556                 print_compound_definition(declaration);
 557                 fputc(';', out);
 558                 break;
 559         case NAMESPACE_UNION:
 560                 fputs("union ", out);
 561                 fputs(declaration->symbol->string, out);
 562                 fputc(' ', out);
 563                 print_compound_definition(declaration);
 564                 fputc(';', out);
 565                 break;
 566         case NAMESPACE_ENUM:
 567                 fputs("enum ", out);
 568                 fputs(declaration->symbol->string, out);
 569                 fputc(' ', out);
 570                 print_enum_definition(declaration);
 571                 fputc(';', out);
 572                 break;
 573         }
 574 }
 575
 576 void print_ast(const translation_unit_t *unit)
 577 {
 578         inc_type_visited();
 579         set_print_compound_entries(true);
 580
 581         declaration_t *declaration = unit->context.declarations;
 582         for( ; declaration != NULL; declaration = declaration->next) {
 583                 if(declaration->storage_class == STORAGE_CLASS_ENUM_ENTRY)
 584                         continue;
 585                 if(declaration->namespace != NAMESPACE_NORMAL &&
 586                                 declaration->symbol == NULL)
 587                         continue;
 588
 589                 print_indent();
 590                 print_declaration(declaration);
 591                 fputc('\n', out);
 592         }
 593 }
 594
 595 void init_ast(void)
 596 {
 597         obstack_init(&ast_obstack);
 598 }
 599
 600 void exit_ast(void)
 601 {
 602         obstack_free(&ast_obstack, NULL);
 603 }
 604
 605 void ast_set_output(FILE *stream)
 606 {
 607         out = stream;
 608         type_set_output(stream);
 609 }
 610
 611 void* (allocate_ast) (size_t size)
 612 {
 613         return _allocate_ast(size);
 614 }