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