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 void print_expression(const expression_t *expression)
 189 {
 190         switch(expression->type) {
 191         case EXPR_INVALID:
 192                 fprintf(out, "*invalid expression*");
 193                 break;
 194         case EXPR_CONST:
 195                 print_const((const const_t*) expression);
 196                 break;
 197         case EXPR_FUNCTION:
 198         case EXPR_PRETTY_FUNCTION:
 199         case EXPR_STRING_LITERAL:
 200                 print_string_literal((const string_literal_t*) expression);
 201                 break;
 202         case EXPR_CALL:
 203                 print_call_expression((const call_expression_t*) expression);
 204                 break;
 205         case EXPR_BINARY:
 206                 print_binary_expression((const binary_expression_t*) expression);
 207                 break;
 208         case EXPR_REFERENCE:
 209                 print_reference_expression((const reference_expression_t*) expression);
 210                 break;
 211         case EXPR_ARRAY_ACCESS:
 212                 print_array_expression((const array_access_expression_t*) expression);
 213                 break;
 214         case EXPR_UNARY:
 215                 print_unary_expression((const unary_expression_t*) expression);
 216                 break;
 217         case EXPR_SIZEOF:
 218                 print_sizeof_expression((const sizeof_expression_t*) expression);
 219                 break;
 220
 221         case EXPR_STATEMENT:
 222         case EXPR_SELECT:
 223                 /* TODO */
 224                 fprintf(out, "some expression of type %d", expression->type);
 225                 break;
 226         }
 227 }
 228
 229 static void print_compound_statement(const compound_statement_t *block)
 230 {
 231         fputs("{\n", out);
 232         indent++;
 233
 234         statement_t *statement = block->statements;
 235         while(statement != NULL) {
 236                 print_indent();
 237                 print_statement(statement);
 238
 239                 statement = statement->next;
 240         }
 241         indent--;
 242         print_indent();
 243         fputs("}\n", out);
 244 }
 245
 246 static void print_return_statement(const return_statement_t *statement)
 247 {
 248         fprintf(out, "return ");
 249         if(statement->return_value != NULL)
 250                 print_expression(statement->return_value);
 251         fputs(";\n", out);
 252 }
 253
 254 static void print_expression_statement(const expression_statement_t *statement)
 255 {
 256         print_expression(statement->expression);
 257         fputs(";\n", out);
 258 }
 259
 260 static void print_goto_statement(const goto_statement_t *statement)
 261 {
 262         fprintf(out, "goto ");
 263         if(statement->label != NULL) {
 264                 fprintf(out, "%s", statement->label->symbol->string);
 265         } else {
 266                 fprintf(out, "?%s", statement->label_symbol->string);
 267         }
 268         fputs(";\n", out);
 269 }
 270
 271 static void print_label_statement(const label_statement_t *statement)
 272 {
 273         fprintf(out, "%s:\n", statement->symbol->string);
 274 }
 275
 276 static void print_if_statement(const if_statement_t *statement)
 277 {
 278         fputs("if(", out);
 279         print_expression(statement->condition);
 280         fputs(") ", out);
 281         if(statement->true_statement != NULL) {
 282                 print_statement(statement->true_statement);
 283         }
 284
 285         if(statement->false_statement != NULL) {
 286                 print_indent();
 287                 fputs("else ", out);
 288                 print_statement(statement->false_statement);
 289         }
 290 }
 291
 292 static void print_switch_statement(const switch_statement_t *statement)
 293 {
 294         fputs("switch(", out);
 295         print_expression(statement->expression);
 296         fputs(") ", out);
 297         print_statement(statement->body);
 298 }
 299
 300 static void print_case_label(const case_label_statement_t *statement)
 301 {
 302         if(statement->expression == NULL) {
 303                 fputs("default:\n", out);
 304         } else {
 305                 fputs("case ", out);
 306                 print_expression(statement->expression);
 307                 fputs(":\n", out);
 308         }
 309 }
 310
 311 static void print_declaration_statement(
 312                 const declaration_statement_t *statement)
 313 {
 314         declaration_t *declaration = statement->declarations_begin;
 315         for( ; declaration != statement->declarations_end->next;
 316                declaration = declaration->next) {
 317                 print_declaration(declaration);
 318         }
 319 }
 320
 321 static void print_while_statement(const while_statement_t *statement)
 322 {
 323         fputs("while(", out);
 324         print_expression(statement->condition);
 325         fputs(") ", out);
 326         print_statement(statement->body);
 327 }
 328
 329 static void print_do_while_statement(const do_while_statement_t *statement)
 330 {
 331         fputs("do ", out);
 332         print_statement(statement->body);
 333         print_indent();
 334         fputs("while(", out);
 335         print_expression(statement->condition);
 336         fputs(");\n", out);
 337 }
 338
 339 static void print_for_statemenet(const for_statement_t *statement)
 340 {
 341         fprintf(out, "for(TODO) ");
 342         print_statement(statement->body);
 343 }
 344
 345 void print_statement(const statement_t *statement)
 346 {
 347         switch(statement->type) {
 348         case STATEMENT_COMPOUND:
 349                 print_compound_statement((const compound_statement_t*) statement);
 350                 break;
 351         case STATEMENT_RETURN:
 352                 print_return_statement((const return_statement_t*) statement);
 353                 break;
 354         case STATEMENT_EXPRESSION:
 355                 print_expression_statement((const expression_statement_t*) statement);
 356                 break;
 357         case STATEMENT_LABEL:
 358                 print_label_statement((const label_statement_t*) statement);
 359                 break;
 360         case STATEMENT_GOTO:
 361                 print_goto_statement((const goto_statement_t*) statement);
 362                 break;
 363         case STATEMENT_CONTINUE:
 364                 fputs("continue;\n", out);
 365                 break;
 366         case STATEMENT_BREAK:
 367                 fputs("break;\n", out);
 368                 break;
 369         case STATEMENT_IF:
 370                 print_if_statement((const if_statement_t*) statement);
 371                 break;
 372         case STATEMENT_SWITCH:
 373                 print_switch_statement((const switch_statement_t*) statement);
 374                 break;
 375         case STATEMENT_CASE_LABEL:
 376                 print_case_label((const case_label_statement_t*) statement);
 377                 break;
 378         case STATEMENT_DECLARATION:
 379                 print_declaration_statement((const declaration_statement_t*) statement);
 380                 break;
 381         case STATEMENT_WHILE:
 382                 print_while_statement((const while_statement_t*) statement);
 383                 break;
 384         case STATEMENT_DO_WHILE:
 385                 print_do_while_statement((const do_while_statement_t*) statement);
 386                 break;
 387         case STATEMENT_FOR:
 388                 print_for_statemenet((const for_statement_t*) statement);
 389                 break;
 390         case STATEMENT_INVALID:
 391                 fprintf(out, "*invalid statement*");
 392                 break;
 393         }
 394 }
 395
 396 static void print_storage_class(storage_class_t storage_class)
 397 {
 398         switch(storage_class) {
 399         case STORAGE_CLASS_ENUM_ENTRY:
 400         case STORAGE_CLASS_NONE:
 401                 break;
 402         case STORAGE_CLASS_TYPEDEF:  fputs("typedef ", out); break;
 403         case STORAGE_CLASS_EXTERN:   fputs("extern ", out); break;
 404         case STORAGE_CLASS_STATIC:   fputs("static ", out); break;
 405         case STORAGE_CLASS_AUTO:     fputs("auto ", out); break;
 406         case STORAGE_CLASS_REGISTER: fputs("register ", out); break;
 407         }
 408 }
 409
 410 static void print_declaration(const declaration_t *declaration)
 411 {
 412         print_storage_class(declaration->storage_class);
 413         print_type_ext(declaration->type, declaration->symbol,
 414                        &declaration->context);
 415         if(declaration->statement != NULL) {
 416                 fputs("\n", out);
 417                 print_statement(declaration->statement);
 418         } else if(declaration->initializer != NULL) {
 419                 fputs(" = ", out);
 420                 print_expression(declaration->initializer);
 421                 fprintf(out, ";\n");
 422         } else {
 423                 fprintf(out, ";\n");
 424         }
 425 }
 426
 427 void print_ast(const translation_unit_t *unit)
 428 {
 429         declaration_t *declaration = unit->context.declarations;
 430         while(declaration != NULL) {
 431                 print_declaration(declaration);
 432
 433                 declaration = declaration->next;
 434         }
 435 }
 436
 437 void init_ast(void)
 438 {
 439         obstack_init(&ast_obstack);
 440 }
 441
 442 void exit_ast(void)
 443 {
 444         obstack_free(&ast_obstack, NULL);
 445 }
 446
 447 void ast_set_output(FILE *stream)
 448 {
 449         out = stream;
 450         type_set_output(stream);
 451 }
 452
 453 void* (allocate_ast) (size_t size)
 454 {
 455         return _allocate_ast(size);
 456 }