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 static void print_declaration(const declaration_t *declaration);
  20
  21 static void print_indent(void)
  22 {
  23         for(int i = 0; i < indent; ++i)
  24                 fprintf(out, "\t");
  25 }
  26
  27 static void print_const(const const_t *cnst)
  28 {
  29         if(cnst->expression.datatype == NULL)
  30                 return;
  31
  32         if(is_type_integer(cnst->expression.datatype)) {
  33                 fprintf(out, "%d", cnst->v.int_value);
  34         } else if(is_type_floating(cnst->expression.datatype)) {
  35                 fprintf(out, "%Lf", cnst->v.float_value);
  36         }
  37 }
  38
  39 static void print_string_literal(const string_literal_t *string_literal)
  40 {
  41         fputc('"', out);
  42         for(const char *c = string_literal->value; *c != '\0'; ++c) {
  43                 switch(*c) {
  44                 case '\"':  fputs("\\\"", out); break;
  45                 case '\\':  fputs("\\\\", out); break;
  46                 case '\a':  fputs("\\a", out); break;
  47                 case '\b':  fputs("\\b", out); break;
  48                 case '\f':  fputs("\\f", out); break;
  49                 case '\n':  fputs("\\n", out); break;
  50                 case '\r':  fputs("\\r", out); break;
  51                 case '\t':  fputs("\\t", out); break;
  52                 case '\v':  fputs("\\v", out); break;
  53                 case '\?':  fputs("\\?", out); break;
  54                 default:
  55                         if(!isprint(*c)) {
  56                                 fprintf(out, "\\x%x", *c);
  57                                 break;
  58                         }
  59                         fputc(*c, out);
  60                         break;
  61                 }
  62         }
  63         fputc('"', out);
  64 }
  65
  66 static void print_call_expression(const call_expression_t *call)
  67 {
  68         print_expression(call->method);
  69         fprintf(out, "(");
  70         call_argument_t *argument = call->arguments;
  71         int              first    = 1;
  72         while(argument != NULL) {
  73                 if(!first) {
  74                         fprintf(out, ", ");
  75                 } else {
  76                         first = 0;
  77                 }
  78                 print_expression(argument->expression);
  79
  80                 argument = argument->next;
  81         }
  82         fprintf(out, ")");
  83 }
  84
  85 static void print_binary_expression(const binary_expression_t *binexpr)
  86 {
  87         fprintf(out, "(");
  88         print_expression(binexpr->left);
  89         fprintf(out, " ");
  90         switch(binexpr->type) {
  91         case BINEXPR_INVALID:            fputs("INVOP", out); break;
  92         case BINEXPR_COMMA:              fputs(",", out);     break;
  93         case BINEXPR_ASSIGN:             fputs("=", out);     break;
  94         case BINEXPR_ADD:                fputs("+", out);     break;
  95         case BINEXPR_SUB:                fputs("-", out);     break;
  96         case BINEXPR_MUL:                fputs("*", out);     break;
  97         case BINEXPR_MOD:                fputs("%", out);     break;
  98         case BINEXPR_DIV:                fputs("/", out);     break;
  99         case BINEXPR_BITWISE_OR:         fputs("|", out);     break;
 100         case BINEXPR_BITWISE_AND:        fputs("&", out);     break;
 101         case BINEXPR_BITWISE_XOR:        fputs("^", out);     break;
 102         case BINEXPR_LOGICAL_OR:         fputs("||", out);    break;
 103         case BINEXPR_LOGICAL_AND:        fputs("&&", out);    break;
 104         case BINEXPR_NOTEQUAL:           fputs("!=", out);    break;
 105         case BINEXPR_EQUAL:              fputs("==", out);    break;
 106         case BINEXPR_LESS:               fputs("<", out);     break;
 107         case BINEXPR_LESSEQUAL:          fputs("<=", out);    break;
 108         case BINEXPR_GREATER:            fputs(">", out);     break;
 109         case BINEXPR_GREATEREQUAL:       fputs(">=", out);    break;
 110         case BINEXPR_SHIFTLEFT:          fputs("<<", out);    break;
 111         case BINEXPR_SHIFTRIGHT:         fputs(">>", out);    break;
 112
 113         case BINEXPR_ADD_ASSIGN:         fputs("+=", out);    break;
 114         case BINEXPR_SUB_ASSIGN:         fputs("-=", out);    break;
 115         case BINEXPR_MUL_ASSIGN:         fputs("*=", out);    break;
 116         case BINEXPR_MOD_ASSIGN:         fputs("%=", out);    break;
 117         case BINEXPR_DIV_ASSIGN:         fputs("/=", out);    break;
 118         case BINEXPR_BITWISE_OR_ASSIGN:  fputs("|=", out);    break;
 119         case BINEXPR_BITWISE_AND_ASSIGN: fputs("&=", out);    break;
 120         case BINEXPR_BITWISE_XOR_ASSIGN: fputs("^=", out);    break;
 121         case BINEXPR_SHIFTLEFT_ASSIGN:   fputs("<<=", out);   break;
 122         case BINEXPR_SHIFTRIGHT_ASSIGN:  fputs(">>=", out);   break;
 123         }
 124         fprintf(out, " ");
 125         print_expression(binexpr->right);
 126         fprintf(out, ")");
 127 }
 128
 129 static void print_unary_expression(const unary_expression_t *unexpr)
 130 {
 131         switch(unexpr->type) {
 132         case UNEXPR_NEGATE:           fputs("-", out);  break;
 133         case UNEXPR_PLUS:             fputs("+", out);  break;
 134         case UNEXPR_NOT:              fputs("!", out);  break;
 135         case UNEXPR_BITWISE_NEGATE:   fputs("~", out);  break;
 136         case UNEXPR_PREFIX_INCREMENT: fputs("++", out); break;
 137         case UNEXPR_PREFIX_DECREMENT: fputs("--", out); break;
 138         case UNEXPR_DEREFERENCE:      fputs("*", out);  break;
 139         case UNEXPR_TAKE_ADDRESS:     fputs("&", out);  break;
 140
 141         case UNEXPR_POSTFIX_INCREMENT:
 142                 fputs("(", out);
 143                 print_expression(unexpr->value);
 144                 fputs(")", out);
 145                 fputs("++", out);
 146                 return;
 147         case UNEXPR_POSTFIX_DECREMENT:
 148                 fputs("(", out);
 149                 print_expression(unexpr->value);
 150                 fputs(")", out);
 151                 fputs("--", out);
 152                 return;
 153         case UNEXPR_CAST:
 154                 fputs("(", out);
 155                 print_type(unexpr->expression.datatype);
 156                 fputs(")", out);
 157                 break;
 158         case UNEXPR_INVALID:
 159                 fprintf(out, "unop%d", unexpr->type);
 160                 break;
 161         }
 162         fputs("(", out);
 163         print_expression(unexpr->value);
 164         fputs(")", out);
 165 }
 166
 167 static void print_reference_expression(const reference_expression_t *ref)
 168 {
 169         fprintf(out, "%s", ref->declaration->symbol->string);
 170 }
 171
 172 static void print_array_expression(const array_access_expression_t *expression)
 173 {
 174         fputs("(", out);
 175         print_expression(expression->array_ref);
 176         fputs(")[", out);
 177         print_expression(expression->index);
 178         fputs("]", out);
 179 }
 180
 181 static void print_sizeof_expression(const sizeof_expression_t *expression)
 182 {
 183         fputs("sizeof", out);
 184         if(expression->size_expression != NULL) {
 185                 fputc('(', out);
 186                 print_expression(expression->size_expression);
 187                 fputc(')', out);
 188         } else {
 189                 fputc('(', out);
 190                 print_type(expression->type);
 191                 fputc(')', out);
 192         }
 193 }
 194
 195 static void print_builtin_symbol(const builtin_symbol_expression_t *expression)
 196 {
 197         fputs(expression->symbol->string, out);
 198 }
 199
 200 static void print_conditional(const conditional_expression_t *expression)
 201 {
 202         fputs("(", out);
 203         print_expression(expression->condition);
 204         fputs(" ? ", out);
 205         print_expression(expression->true_expression);
 206         fputs(" : ", out);
 207         print_expression(expression->false_expression);
 208         fputs(")", out);
 209 }
 210
 211 void print_expression(const expression_t *expression)
 212 {
 213         switch(expression->type) {
 214         case EXPR_INVALID:
 215                 fprintf(out, "*invalid expression*");
 216                 break;
 217         case EXPR_CONST:
 218                 print_const((const const_t*) expression);
 219                 break;
 220         case EXPR_FUNCTION:
 221         case EXPR_PRETTY_FUNCTION:
 222         case EXPR_STRING_LITERAL:
 223                 print_string_literal((const string_literal_t*) expression);
 224                 break;
 225         case EXPR_CALL:
 226                 print_call_expression((const call_expression_t*) expression);
 227                 break;
 228         case EXPR_BINARY:
 229                 print_binary_expression((const binary_expression_t*) expression);
 230                 break;
 231         case EXPR_REFERENCE:
 232                 print_reference_expression((const reference_expression_t*) expression);
 233                 break;
 234         case EXPR_ARRAY_ACCESS:
 235                 print_array_expression((const array_access_expression_t*) expression);
 236                 break;
 237         case EXPR_UNARY:
 238                 print_unary_expression((const unary_expression_t*) expression);
 239                 break;
 240         case EXPR_SIZEOF:
 241                 print_sizeof_expression((const sizeof_expression_t*) expression);
 242                 break;
 243         case EXPR_BUILTIN_SYMBOL:
 244                 print_builtin_symbol((const builtin_symbol_expression_t*) expression);
 245                 break;
 246         case EXPR_CONDITIONAL:
 247                 print_conditional((const conditional_expression_t*) expression);
 248                 break;
 249
 250         case EXPR_OFFSETOF:
 251         case EXPR_STATEMENT:
 252         case EXPR_SELECT:
 253                 /* TODO */
 254                 fprintf(out, "some expression of type %d", expression->type);
 255                 break;
 256         }
 257 }
 258
 259 static void print_compound_statement(const compound_statement_t *block)
 260 {
 261         fputs("{\n", out);
 262         indent++;
 263
 264         statement_t *statement = block->statements;
 265         while(statement != NULL) {
 266                 print_indent();
 267                 print_statement(statement);
 268
 269                 statement = statement->next;
 270         }
 271         indent--;
 272         print_indent();
 273         fputs("}\n", out);
 274 }
 275
 276 static void print_return_statement(const return_statement_t *statement)
 277 {
 278         fprintf(out, "return ");
 279         if(statement->return_value != NULL)
 280                 print_expression(statement->return_value);
 281         fputs(";\n", out);
 282 }
 283
 284 static void print_expression_statement(const expression_statement_t *statement)
 285 {
 286         print_expression(statement->expression);
 287         fputs(";\n", out);
 288 }
 289
 290 static void print_goto_statement(const goto_statement_t *statement)
 291 {
 292         fprintf(out, "goto ");
 293         if(statement->label != NULL) {
 294                 fprintf(out, "%s", statement->label->symbol->string);
 295         } else {
 296                 fprintf(out, "?%s", statement->label_symbol->string);
 297         }
 298         fputs(";\n", out);
 299 }
 300
 301 static void print_label_statement(const label_statement_t *statement)
 302 {
 303         fprintf(out, "%s:\n", statement->symbol->string);
 304 }
 305
 306 static void print_if_statement(const if_statement_t *statement)
 307 {
 308         fputs("if(", out);
 309         print_expression(statement->condition);
 310         fputs(") ", out);
 311         if(statement->true_statement != NULL) {
 312                 print_statement(statement->true_statement);
 313         }
 314
 315         if(statement->false_statement != NULL) {
 316                 print_indent();
 317                 fputs("else ", out);
 318                 print_statement(statement->false_statement);
 319         }
 320 }
 321
 322 static void print_switch_statement(const switch_statement_t *statement)
 323 {
 324         fputs("switch(", out);
 325         print_expression(statement->expression);
 326         fputs(") ", out);
 327         print_statement(statement->body);
 328 }
 329
 330 static void print_case_label(const case_label_statement_t *statement)
 331 {
 332         if(statement->expression == NULL) {
 333                 fputs("default:\n", out);
 334         } else {
 335                 fputs("case ", out);
 336                 print_expression(statement->expression);
 337                 fputs(":\n", out);
 338         }
 339 }
 340
 341 static void print_declaration_statement(
 342                 const declaration_statement_t *statement)
 343 {
 344         declaration_t *declaration = statement->declarations_begin;
 345         for( ; declaration != statement->declarations_end->next;
 346                declaration = declaration->next) {
 347                 print_declaration(declaration);
 348         }
 349 }
 350
 351 static void print_while_statement(const while_statement_t *statement)
 352 {
 353         fputs("while(", out);
 354         print_expression(statement->condition);
 355         fputs(") ", out);
 356         print_statement(statement->body);
 357 }
 358
 359 static void print_do_while_statement(const do_while_statement_t *statement)
 360 {
 361         fputs("do ", out);
 362         print_statement(statement->body);
 363         print_indent();
 364         fputs("while(", out);
 365         print_expression(statement->condition);
 366         fputs(");\n", out);
 367 }
 368
 369 static void print_for_statement(const for_statement_t *statement)
 370 {
 371         fputs("for(", out);
 372         if(statement->context.declarations != NULL) {
 373                 assert(statement->initialisation == NULL);
 374                 print_declaration(statement->context.declarations);
 375                 if(statement->context.declarations->next != NULL) {
 376                         panic("multiple declarations in for statement not supported yet");
 377                 }
 378         } else if(statement->initialisation) {
 379                 print_expression(statement->initialisation);
 380         }
 381         fputs("; ", out);
 382         if(statement->condition != NULL) {
 383                 print_expression(statement->condition);
 384         }
 385         fputs("; ", out);
 386         if(statement->step != NULL) {
 387                 print_expression(statement->step);
 388         }
 389         fputs(")", out);
 390         print_statement(statement->body);
 391 }
 392
 393 void print_statement(const statement_t *statement)
 394 {
 395         switch(statement->type) {
 396         case STATEMENT_COMPOUND:
 397                 print_compound_statement((const compound_statement_t*) statement);
 398                 break;
 399         case STATEMENT_RETURN:
 400                 print_return_statement((const return_statement_t*) statement);
 401                 break;
 402         case STATEMENT_EXPRESSION:
 403                 print_expression_statement((const expression_statement_t*) statement);
 404                 break;
 405         case STATEMENT_LABEL:
 406                 print_label_statement((const label_statement_t*) statement);
 407                 break;
 408         case STATEMENT_GOTO:
 409                 print_goto_statement((const goto_statement_t*) statement);
 410                 break;
 411         case STATEMENT_CONTINUE:
 412                 fputs("continue;\n", out);
 413                 break;
 414         case STATEMENT_BREAK:
 415                 fputs("break;\n", out);
 416                 break;
 417         case STATEMENT_IF:
 418                 print_if_statement((const if_statement_t*) statement);
 419                 break;
 420         case STATEMENT_SWITCH:
 421                 print_switch_statement((const switch_statement_t*) statement);
 422                 break;
 423         case STATEMENT_CASE_LABEL:
 424                 print_case_label((const case_label_statement_t*) statement);
 425                 break;
 426         case STATEMENT_DECLARATION:
 427                 print_declaration_statement((const declaration_statement_t*) statement);
 428                 break;
 429         case STATEMENT_WHILE:
 430                 print_while_statement((const while_statement_t*) statement);
 431                 break;
 432         case STATEMENT_DO_WHILE:
 433                 print_do_while_statement((const do_while_statement_t*) statement);
 434                 break;
 435         case STATEMENT_FOR:
 436                 print_for_statement((const for_statement_t*) statement);
 437                 break;
 438         case STATEMENT_INVALID:
 439                 fprintf(out, "*invalid statement*");
 440                 break;
 441         }
 442 }
 443
 444 static void print_storage_class(storage_class_t storage_class)
 445 {
 446         switch(storage_class) {
 447         case STORAGE_CLASS_ENUM_ENTRY:
 448         case STORAGE_CLASS_NONE:
 449                 break;
 450         case STORAGE_CLASS_TYPEDEF:  fputs("typedef ", out); break;
 451         case STORAGE_CLASS_EXTERN:   fputs("extern ", out); break;
 452         case STORAGE_CLASS_STATIC:   fputs("static ", out); break;
 453         case STORAGE_CLASS_AUTO:     fputs("auto ", out); break;
 454         case STORAGE_CLASS_REGISTER: fputs("register ", out); break;
 455         }
 456 }
 457
 458 static void print_declaration(const declaration_t *declaration)
 459 {
 460         print_storage_class(declaration->storage_class);
 461         print_type_ext(declaration->type, declaration->symbol,
 462                        &declaration->context);
 463         if(declaration->statement != NULL) {
 464                 fputs("\n", out);
 465                 print_statement(declaration->statement);
 466         } else if(declaration->initializer != NULL) {
 467                 fputs(" = ", out);
 468                 print_expression(declaration->initializer);
 469                 fprintf(out, ";\n");
 470         } else {
 471                 fprintf(out, ";\n");
 472         }
 473 }
 474
 475 void print_ast(const translation_unit_t *unit)
 476 {
 477         declaration_t *declaration = unit->context.declarations;
 478         while(declaration != NULL) {
 479                 print_declaration(declaration);
 480
 481                 declaration = declaration->next;
 482         }
 483 }
 484
 485 void init_ast(void)
 486 {
 487         obstack_init(&ast_obstack);
 488 }
 489
 490 void exit_ast(void)
 491 {
 492         obstack_free(&ast_obstack, NULL);
 493 }
 494
 495 void ast_set_output(FILE *stream)
 496 {
 497         out = stream;
 498         type_set_output(stream);
 499 }
 500
 501 void* (allocate_ast) (size_t size)
 502 {
 503         return _allocate_ast(size);
 504 }