nsz Git - cparser/blob - ast.c

   1 /*
   2  * This file is part of cparser.
   3  * Copyright (C) 2007-2009 Matthias Braun <matze@braunis.de>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  18  * 02111-1307, USA.
  19  */
  20 #include <config.h>
  21
  22 #include "ast_t.h"
  23 #include "symbol_t.h"
  24 #include "type_t.h"
  25 #include "parser.h"
  26 #include "lang_features.h"
  27 #include "entity_t.h"
  28 #include "printer.h"
  29 #include "types.h"
  30
  31 #include <assert.h>
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34 #include <ctype.h>
  35
  36 #if defined(__INTEL_COMPILER)
  37 #include <mathimf.h>
  38 #elif defined(__CYGWIN__)
  39 #include "win32/cygwin_math_ext.h"
  40 #else
  41 #include <math.h>
  42 #endif
  43
  44 #include "adt/error.h"
  45 #include "adt/util.h"
  46
  47 struct obstack ast_obstack;
  48
  49 static int indent;
  50
  51 bool print_implicit_casts = false;
  52 bool print_parenthesis = false;
  53
  54 static void print_statement(const statement_t *statement);
  55 static void print_expression_prec(const expression_t *expression, unsigned prec);
  56
  57 void change_indent(int delta)
  58 {
  59         indent += delta;
  60         assert(indent >= 0);
  61 }
  62
  63 void print_indent(void)
  64 {
  65         for (int i = 0; i < indent; ++i)
  66                 print_string("\t");
  67 }
  68
  69 static void print_symbol(const symbol_t *symbol)
  70 {
  71         print_string(symbol->string);
  72 }
  73
  74 static void print_stringrep(const string_t *string)
  75 {
  76         for (size_t i = 0; i < string->size; ++i) {
  77                 print_char(string->begin[i]);
  78         }
  79 }
  80
  81 /**
  82  * Returns 1 if a given precedence level has right-to-left
  83  * associativity, else 0.
  84  *
  85  * @param precedence   the operator precedence
  86  */
  87 static int right_to_left(unsigned precedence)
  88 {
  89         switch (precedence) {
  90         case PREC_ASSIGNMENT:
  91         case PREC_CONDITIONAL:
  92         case PREC_UNARY:
  93                 return 1;
  94
  95         default:
  96                 return 0;
  97         }
  98 }
  99
 100 /**
 101  * Return the precedence of an expression given by its kind.
 102  *
 103  * @param kind   the expression kind
 104  */
 105 static unsigned get_expression_precedence(expression_kind_t kind)
 106 {
 107         static const unsigned prec[] = {
 108                 [EXPR_UNKNOWN]                           = PREC_PRIMARY,
 109                 [EXPR_INVALID]                           = PREC_PRIMARY,
 110                 [EXPR_REFERENCE]                         = PREC_PRIMARY,
 111                 [EXPR_REFERENCE_ENUM_VALUE]              = PREC_PRIMARY,
 112                 [EXPR_LITERAL_INTEGER]                   = PREC_PRIMARY,
 113                 [EXPR_LITERAL_INTEGER_OCTAL]             = PREC_PRIMARY,
 114                 [EXPR_LITERAL_INTEGER_HEXADECIMAL]       = PREC_PRIMARY,
 115                 [EXPR_LITERAL_FLOATINGPOINT]             = PREC_PRIMARY,
 116                 [EXPR_LITERAL_FLOATINGPOINT_HEXADECIMAL] = PREC_PRIMARY,
 117                 [EXPR_LITERAL_CHARACTER]                 = PREC_PRIMARY,
 118                 [EXPR_LITERAL_WIDE_CHARACTER]            = PREC_PRIMARY,
 119                 [EXPR_LITERAL_MS_NOOP]                   = PREC_PRIMARY,
 120                 [EXPR_STRING_LITERAL]                    = PREC_PRIMARY,
 121                 [EXPR_WIDE_STRING_LITERAL]               = PREC_PRIMARY,
 122                 [EXPR_COMPOUND_LITERAL]                  = PREC_UNARY,
 123                 [EXPR_CALL]                              = PREC_POSTFIX,
 124                 [EXPR_CONDITIONAL]                       = PREC_CONDITIONAL,
 125                 [EXPR_SELECT]                            = PREC_POSTFIX,
 126                 [EXPR_ARRAY_ACCESS]                      = PREC_POSTFIX,
 127                 [EXPR_SIZEOF]                            = PREC_UNARY,
 128                 [EXPR_CLASSIFY_TYPE]                     = PREC_UNARY,
 129                 [EXPR_ALIGNOF]                           = PREC_UNARY,
 130
 131                 [EXPR_FUNCNAME]                          = PREC_PRIMARY,
 132                 [EXPR_BUILTIN_CONSTANT_P]                = PREC_PRIMARY,
 133                 [EXPR_BUILTIN_TYPES_COMPATIBLE_P]        = PREC_PRIMARY,
 134                 [EXPR_OFFSETOF]                          = PREC_PRIMARY,
 135                 [EXPR_VA_START]                          = PREC_PRIMARY,
 136                 [EXPR_VA_ARG]                            = PREC_PRIMARY,
 137                 [EXPR_VA_COPY]                           = PREC_PRIMARY,
 138                 [EXPR_STATEMENT]                         = PREC_PRIMARY,
 139                 [EXPR_LABEL_ADDRESS]                     = PREC_PRIMARY,
 140
 141                 [EXPR_UNARY_NEGATE]                      = PREC_UNARY,
 142                 [EXPR_UNARY_PLUS]                        = PREC_UNARY,
 143                 [EXPR_UNARY_BITWISE_NEGATE]              = PREC_UNARY,
 144                 [EXPR_UNARY_NOT]                         = PREC_UNARY,
 145                 [EXPR_UNARY_DEREFERENCE]                 = PREC_UNARY,
 146                 [EXPR_UNARY_TAKE_ADDRESS]                = PREC_UNARY,
 147                 [EXPR_UNARY_POSTFIX_INCREMENT]           = PREC_POSTFIX,
 148                 [EXPR_UNARY_POSTFIX_DECREMENT]           = PREC_POSTFIX,
 149                 [EXPR_UNARY_PREFIX_INCREMENT]            = PREC_UNARY,
 150                 [EXPR_UNARY_PREFIX_DECREMENT]            = PREC_UNARY,
 151                 [EXPR_UNARY_CAST]                        = PREC_UNARY,
 152                 [EXPR_UNARY_ASSUME]                      = PREC_PRIMARY,
 153                 [EXPR_UNARY_DELETE]                      = PREC_UNARY,
 154                 [EXPR_UNARY_DELETE_ARRAY]                = PREC_UNARY,
 155                 [EXPR_UNARY_THROW]                       = PREC_ASSIGNMENT,
 156
 157                 [EXPR_BINARY_ADD]                        = PREC_ADDITIVE,
 158                 [EXPR_BINARY_SUB]                        = PREC_ADDITIVE,
 159                 [EXPR_BINARY_MUL]                        = PREC_MULTIPLICATIVE,
 160                 [EXPR_BINARY_DIV]                        = PREC_MULTIPLICATIVE,
 161                 [EXPR_BINARY_MOD]                        = PREC_MULTIPLICATIVE,
 162                 [EXPR_BINARY_EQUAL]                      = PREC_EQUALITY,
 163                 [EXPR_BINARY_NOTEQUAL]                   = PREC_EQUALITY,
 164                 [EXPR_BINARY_LESS]                       = PREC_RELATIONAL,
 165                 [EXPR_BINARY_LESSEQUAL]                  = PREC_RELATIONAL,
 166                 [EXPR_BINARY_GREATER]                    = PREC_RELATIONAL,
 167                 [EXPR_BINARY_GREATEREQUAL]               = PREC_RELATIONAL,
 168                 [EXPR_BINARY_BITWISE_AND]                = PREC_AND,
 169                 [EXPR_BINARY_BITWISE_OR]                 = PREC_OR,
 170                 [EXPR_BINARY_BITWISE_XOR]                = PREC_XOR,
 171                 [EXPR_BINARY_LOGICAL_AND]                = PREC_LOGICAL_AND,
 172                 [EXPR_BINARY_LOGICAL_OR]                 = PREC_LOGICAL_OR,
 173                 [EXPR_BINARY_SHIFTLEFT]                  = PREC_SHIFT,
 174                 [EXPR_BINARY_SHIFTRIGHT]                 = PREC_SHIFT,
 175                 [EXPR_BINARY_ASSIGN]                     = PREC_ASSIGNMENT,
 176                 [EXPR_BINARY_MUL_ASSIGN]                 = PREC_ASSIGNMENT,
 177                 [EXPR_BINARY_DIV_ASSIGN]                 = PREC_ASSIGNMENT,
 178                 [EXPR_BINARY_MOD_ASSIGN]                 = PREC_ASSIGNMENT,
 179                 [EXPR_BINARY_ADD_ASSIGN]                 = PREC_ASSIGNMENT,
 180                 [EXPR_BINARY_SUB_ASSIGN]                 = PREC_ASSIGNMENT,
 181                 [EXPR_BINARY_SHIFTLEFT_ASSIGN]           = PREC_ASSIGNMENT,
 182                 [EXPR_BINARY_SHIFTRIGHT_ASSIGN]          = PREC_ASSIGNMENT,
 183                 [EXPR_BINARY_BITWISE_AND_ASSIGN]         = PREC_ASSIGNMENT,
 184                 [EXPR_BINARY_BITWISE_XOR_ASSIGN]         = PREC_ASSIGNMENT,
 185                 [EXPR_BINARY_BITWISE_OR_ASSIGN]          = PREC_ASSIGNMENT,
 186                 [EXPR_BINARY_COMMA]                      = PREC_EXPRESSION,
 187
 188                 [EXPR_BINARY_ISGREATER]                  = PREC_PRIMARY,
 189                 [EXPR_BINARY_ISGREATEREQUAL]             = PREC_PRIMARY,
 190                 [EXPR_BINARY_ISLESS]                     = PREC_PRIMARY,
 191                 [EXPR_BINARY_ISLESSEQUAL]                = PREC_PRIMARY,
 192                 [EXPR_BINARY_ISLESSGREATER]              = PREC_PRIMARY,
 193                 [EXPR_BINARY_ISUNORDERED]                = PREC_PRIMARY
 194         };
 195         assert((size_t)kind < lengthof(prec));
 196         unsigned res = prec[kind];
 197
 198         assert(res != PREC_BOTTOM);
 199         return res;
 200 }
 201
 202 /**
 203  * Print a quoted string constant.
 204  *
 205  * @param string  the string constant
 206  * @param border  the border char
 207  * @param skip    number of chars to skip at the end
 208  */
 209 static void print_quoted_string(const string_t *const string, char border,
 210                                 int skip)
 211 {
 212         print_char(border);
 213         const char *end = string->begin + string->size - skip;
 214         for (const char *c = string->begin; c != end; ++c) {
 215                 const char tc = *c;
 216                 if (tc == border) {
 217                         print_string("\\");
 218                 }
 219                 switch (tc) {
 220                 case '\\': print_string("\\\\"); break;
 221                 case '\a': print_string("\\a"); break;
 222                 case '\b': print_string("\\b"); break;
 223                 case '\f': print_string("\\f"); break;
 224                 case '\n': print_string("\\n"); break;
 225                 case '\r': print_string("\\r"); break;
 226                 case '\t': print_string("\\t"); break;
 227                 case '\v': print_string("\\v"); break;
 228                 case '\?': print_string("\\?"); break;
 229                 case 27:
 230                         if (c_mode & _GNUC) {
 231                                 print_string("\\e"); break;
 232                         }
 233                         /* FALLTHROUGH */
 234                 default:
 235                         if ((unsigned)tc < 0x80 && !isprint(tc)) {
 236                                 print_format("\\%03o", (unsigned)tc);
 237                         } else {
 238                                 print_char(tc);
 239                         }
 240                         break;
 241                 }
 242         }
 243         print_char(border);
 244 }
 245
 246 static void print_string_literal(const string_literal_expression_t *literal)
 247 {
 248         if (literal->base.kind == EXPR_WIDE_STRING_LITERAL) {
 249                 print_char('L');
 250         }
 251         print_quoted_string(&literal->value, '"', 1);
 252 }
 253
 254 static void print_literal(const literal_expression_t *literal)
 255 {
 256         switch (literal->base.kind) {
 257         case EXPR_LITERAL_MS_NOOP:
 258                 print_string("__noop");
 259                 return;
 260         case EXPR_LITERAL_INTEGER_HEXADECIMAL:
 261         case EXPR_LITERAL_FLOATINGPOINT_HEXADECIMAL:
 262                 print_string("0x");
 263                 /* FALLTHROUGH */
 264         case EXPR_LITERAL_BOOLEAN:
 265         case EXPR_LITERAL_INTEGER:
 266         case EXPR_LITERAL_INTEGER_OCTAL:
 267         case EXPR_LITERAL_FLOATINGPOINT:
 268                 print_stringrep(&literal->value);
 269                 if (literal->suffix != NULL)
 270                         print_symbol(literal->suffix);
 271                 return;
 272         case EXPR_LITERAL_WIDE_CHARACTER:
 273                 print_char('L');
 274                 /* FALLTHROUGH */
 275         case EXPR_LITERAL_CHARACTER:
 276                 print_quoted_string(&literal->value, '\'', 0);
 277                 return;
 278         default:
 279                 break;
 280         }
 281         print_string("INVALID LITERAL KIND");
 282 }
 283
 284 /**
 285  * Prints a predefined symbol.
 286  */
 287 static void print_funcname(const funcname_expression_t *funcname)
 288 {
 289         const char *s = "";
 290         switch (funcname->kind) {
 291         case FUNCNAME_FUNCTION:        s = (c_mode & _C99) ? "__func__" : "__FUNCTION__"; break;
 292         case FUNCNAME_PRETTY_FUNCTION: s = "__PRETTY_FUNCTION__"; break;
 293         case FUNCNAME_FUNCSIG:         s = "__FUNCSIG__"; break;
 294         case FUNCNAME_FUNCDNAME:       s = "__FUNCDNAME__"; break;
 295         }
 296         print_string(s);
 297 }
 298
 299 static void print_compound_literal(
 300                 const compound_literal_expression_t *expression)
 301 {
 302         print_string("(");
 303         print_type(expression->type);
 304         print_string(")");
 305         print_initializer(expression->initializer);
 306 }
 307
 308 static void print_assignment_expression(const expression_t *const expr)
 309 {
 310         print_expression_prec(expr, PREC_ASSIGNMENT);
 311 }
 312
 313 /**
 314  * Prints a call expression.
 315  *
 316  * @param call  the call expression
 317  */
 318 static void print_call_expression(const call_expression_t *call)
 319 {
 320         print_expression_prec(call->function, PREC_POSTFIX);
 321         print_string("(");
 322         call_argument_t *argument = call->arguments;
 323         int              first    = 1;
 324         while (argument != NULL) {
 325                 if (!first) {
 326                         print_string(", ");
 327                 } else {
 328                         first = 0;
 329                 }
 330                 print_assignment_expression(argument->expression);
 331
 332                 argument = argument->next;
 333         }
 334         print_string(")");
 335 }
 336
 337 /**
 338  * Prints a binary expression.
 339  *
 340  * @param binexpr   the binary expression
 341  */
 342 static void print_binary_expression(const binary_expression_t *binexpr)
 343 {
 344         unsigned prec = get_expression_precedence(binexpr->base.kind);
 345         int      r2l  = right_to_left(prec);
 346
 347         print_expression_prec(binexpr->left, prec + r2l);
 348         char const* op;
 349         switch (binexpr->base.kind) {
 350         case EXPR_BINARY_COMMA:              op = ", ";    break;
 351         case EXPR_BINARY_ASSIGN:             op = " = ";   break;
 352         case EXPR_BINARY_ADD:                op = " + ";   break;
 353         case EXPR_BINARY_SUB:                op = " - ";   break;
 354         case EXPR_BINARY_MUL:                op = " * ";   break;
 355         case EXPR_BINARY_MOD:                op = " % ";   break;
 356         case EXPR_BINARY_DIV:                op = " / ";   break;
 357         case EXPR_BINARY_BITWISE_OR:         op = " | ";   break;
 358         case EXPR_BINARY_BITWISE_AND:        op = " & ";   break;
 359         case EXPR_BINARY_BITWISE_XOR:        op = " ^ ";   break;
 360         case EXPR_BINARY_LOGICAL_OR:         op = " || ";  break;
 361         case EXPR_BINARY_LOGICAL_AND:        op = " && ";  break;
 362         case EXPR_BINARY_NOTEQUAL:           op = " != ";  break;
 363         case EXPR_BINARY_EQUAL:              op = " == ";  break;
 364         case EXPR_BINARY_LESS:               op = " < ";   break;
 365         case EXPR_BINARY_LESSEQUAL:          op = " <= ";  break;
 366         case EXPR_BINARY_GREATER:            op = " > ";   break;
 367         case EXPR_BINARY_GREATEREQUAL:       op = " >= ";  break;
 368         case EXPR_BINARY_SHIFTLEFT:          op = " << ";  break;
 369         case EXPR_BINARY_SHIFTRIGHT:         op = " >> ";  break;
 370
 371         case EXPR_BINARY_ADD_ASSIGN:         op = " += ";  break;
 372         case EXPR_BINARY_SUB_ASSIGN:         op = " -= ";  break;
 373         case EXPR_BINARY_MUL_ASSIGN:         op = " *= ";  break;
 374         case EXPR_BINARY_MOD_ASSIGN:         op = " %= ";  break;
 375         case EXPR_BINARY_DIV_ASSIGN:         op = " /= ";  break;
 376         case EXPR_BINARY_BITWISE_OR_ASSIGN:  op = " |= ";  break;
 377         case EXPR_BINARY_BITWISE_AND_ASSIGN: op = " &= ";  break;
 378         case EXPR_BINARY_BITWISE_XOR_ASSIGN: op = " ^= ";  break;
 379         case EXPR_BINARY_SHIFTLEFT_ASSIGN:   op = " <<= "; break;
 380         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:  op = " >>= "; break;
 381         default: panic("invalid binexpression found");
 382         }
 383         print_string(op);
 384         print_expression_prec(binexpr->right, prec + 1 - r2l);
 385 }
 386
 387 /**
 388  * Prints an unary expression.
 389  *
 390  * @param unexpr   the unary expression
 391  */
 392 static void print_unary_expression(const unary_expression_t *unexpr)
 393 {
 394         unsigned prec = get_expression_precedence(unexpr->base.kind);
 395         switch (unexpr->base.kind) {
 396         case EXPR_UNARY_NEGATE:           print_string("-"); break;
 397         case EXPR_UNARY_PLUS:             print_string("+"); break;
 398         case EXPR_UNARY_NOT:              print_string("!"); break;
 399         case EXPR_UNARY_BITWISE_NEGATE:   print_string("~"); break;
 400         case EXPR_UNARY_PREFIX_INCREMENT: print_string("++"); break;
 401         case EXPR_UNARY_PREFIX_DECREMENT: print_string("--"); break;
 402         case EXPR_UNARY_DEREFERENCE:      print_string("*"); break;
 403         case EXPR_UNARY_TAKE_ADDRESS:     print_string("&"); break;
 404         case EXPR_UNARY_DELETE:           print_string("delete "); break;
 405         case EXPR_UNARY_DELETE_ARRAY:     print_string("delete [] "); break;
 406
 407         case EXPR_UNARY_POSTFIX_INCREMENT:
 408                 print_expression_prec(unexpr->value, prec);
 409                 print_string("++");
 410                 return;
 411         case EXPR_UNARY_POSTFIX_DECREMENT:
 412                 print_expression_prec(unexpr->value, prec);
 413                 print_string("--");
 414                 return;
 415         case EXPR_UNARY_CAST:
 416                 print_string("(");
 417                 print_type(unexpr->base.type);
 418                 print_string(")");
 419                 break;
 420         case EXPR_UNARY_ASSUME:
 421                 print_string("__assume(");
 422                 print_assignment_expression(unexpr->value);
 423                 print_string(")");
 424                 return;
 425
 426         case EXPR_UNARY_THROW:
 427                 if (unexpr->value == NULL) {
 428                         print_string("throw");
 429                         return;
 430                 }
 431                 print_string("throw ");
 432                 break;
 433
 434         default:
 435                 panic("invalid unary expression found");
 436         }
 437         print_expression_prec(unexpr->value, prec);
 438 }
 439
 440 /**
 441  * Prints a reference expression.
 442  *
 443  * @param ref   the reference expression
 444  */
 445 static void print_reference_expression(const reference_expression_t *ref)
 446 {
 447         print_string(ref->entity->base.symbol->string);
 448 }
 449
 450 /**
 451  * Prints a label address expression.
 452  *
 453  * @param ref   the reference expression
 454  */
 455 static void print_label_address_expression(const label_address_expression_t *le)
 456 {
 457         print_format("&&%s", le->label->base.symbol->string);
 458 }
 459
 460 /**
 461  * Prints an array expression.
 462  *
 463  * @param expression   the array expression
 464  */
 465 static void print_array_expression(const array_access_expression_t *expression)
 466 {
 467         if (!expression->flipped) {
 468                 print_expression_prec(expression->array_ref, PREC_POSTFIX);
 469                 print_string("[");
 470                 print_expression(expression->index);
 471                 print_string("]");
 472         } else {
 473                 print_expression_prec(expression->index, PREC_POSTFIX);
 474                 print_string("[");
 475                 print_expression(expression->array_ref);
 476                 print_string("]");
 477         }
 478 }
 479
 480 /**
 481  * Prints a typeproperty expression (sizeof or __alignof__).
 482  *
 483  * @param expression   the type property expression
 484  */
 485 static void print_typeprop_expression(const typeprop_expression_t *expression)
 486 {
 487         if (expression->base.kind == EXPR_SIZEOF) {
 488                 print_string("sizeof");
 489         } else {
 490                 assert(expression->base.kind == EXPR_ALIGNOF);
 491                 print_string("__alignof__");
 492         }
 493         if (expression->tp_expression != NULL) {
 494                 /* PREC_TOP: always print the '()' here, sizeof x is right but unusual */
 495                 print_expression_prec(expression->tp_expression, PREC_TOP);
 496         } else {
 497                 print_string("(");
 498                 print_type(expression->type);
 499                 print_string(")");
 500         }
 501 }
 502
 503 /**
 504  * Prints a builtin constant expression.
 505  *
 506  * @param expression   the builtin constant expression
 507  */
 508 static void print_builtin_constant(const builtin_constant_expression_t *expression)
 509 {
 510         print_string("__builtin_constant_p(");
 511         print_assignment_expression(expression->value);
 512         print_string(")");
 513 }
 514
 515 /**
 516  * Prints a builtin types compatible expression.
 517  *
 518  * @param expression   the builtin types compatible expression
 519  */
 520 static void print_builtin_types_compatible(
 521                 const builtin_types_compatible_expression_t *expression)
 522 {
 523         print_string("__builtin_types_compatible_p(");
 524         print_type(expression->left);
 525         print_string(", ");
 526         print_type(expression->right);
 527         print_string(")");
 528 }
 529
 530 /**
 531  * Prints a conditional expression.
 532  *
 533  * @param expression   the conditional expression
 534  */
 535 static void print_conditional(const conditional_expression_t *expression)
 536 {
 537         print_expression_prec(expression->condition, PREC_LOGICAL_OR);
 538         if (expression->true_expression != NULL) {
 539                 print_string(" ? ");
 540                 print_expression_prec(expression->true_expression, PREC_EXPRESSION);
 541                 print_string(" : ");
 542         } else {
 543                 print_string(" ?: ");
 544         }
 545         precedence_t prec = c_mode & _CXX ? PREC_ASSIGNMENT : PREC_CONDITIONAL;
 546         print_expression_prec(expression->false_expression, prec);
 547 }
 548
 549 /**
 550  * Prints a va_start expression.
 551  *
 552  * @param expression   the va_start expression
 553  */
 554 static void print_va_start(const va_start_expression_t *const expression)
 555 {
 556         print_string("__builtin_va_start(");
 557         print_assignment_expression(expression->ap);
 558         print_string(", ");
 559         print_string(expression->parameter->base.base.symbol->string);
 560         print_string(")");
 561 }
 562
 563 /**
 564  * Prints a va_arg expression.
 565  *
 566  * @param expression   the va_arg expression
 567  */
 568 static void print_va_arg(const va_arg_expression_t *expression)
 569 {
 570         print_string("__builtin_va_arg(");
 571         print_assignment_expression(expression->ap);
 572         print_string(", ");
 573         print_type(expression->base.type);
 574         print_string(")");
 575 }
 576
 577 /**
 578  * Prints a va_copy expression.
 579  *
 580  * @param expression   the va_copy expression
 581  */
 582 static void print_va_copy(const va_copy_expression_t *expression)
 583 {
 584         print_string("__builtin_va_copy(");
 585         print_assignment_expression(expression->dst);
 586         print_string(", ");
 587         print_assignment_expression(expression->src);
 588         print_string(")");
 589 }
 590
 591 /**
 592  * Prints a select expression (. or ->).
 593  *
 594  * @param expression   the select expression
 595  */
 596 static void print_select(const select_expression_t *expression)
 597 {
 598         print_expression_prec(expression->compound, PREC_POSTFIX);
 599         if (is_type_pointer(skip_typeref(expression->compound->base.type))) {
 600                 print_string("->");
 601         } else {
 602                 print_string(".");
 603         }
 604         print_string(expression->compound_entry->base.symbol->string);
 605 }
 606
 607 /**
 608  * Prints a type classify expression.
 609  *
 610  * @param expr   the type classify expression
 611  */
 612 static void print_classify_type_expression(
 613         const classify_type_expression_t *const expr)
 614 {
 615         print_string("__builtin_classify_type(");
 616         print_assignment_expression(expr->type_expression);
 617         print_string(")");
 618 }
 619
 620 /**
 621  * Prints a designator.
 622  *
 623  * @param designator  the designator
 624  */
 625 static void print_designator(const designator_t *designator)
 626 {
 627         for ( ; designator != NULL; designator = designator->next) {
 628                 if (designator->symbol == NULL) {
 629                         print_string("[");
 630                         print_expression(designator->array_index);
 631                         print_string("]");
 632                 } else {
 633                         print_string(".");
 634                         print_string(designator->symbol->string);
 635                 }
 636         }
 637 }
 638
 639 /**
 640  * Prints an offsetof expression.
 641  *
 642  * @param expression   the offset expression
 643  */
 644 static void print_offsetof_expression(const offsetof_expression_t *expression)
 645 {
 646         print_string("__builtin_offsetof(");
 647         print_type(expression->type);
 648         print_string(",");
 649         print_designator(expression->designator);
 650         print_string(")");
 651 }
 652
 653 /**
 654  * Prints a statement expression.
 655  *
 656  * @param expression   the statement expression
 657  */
 658 static void print_statement_expression(const statement_expression_t *expression)
 659 {
 660         print_string("(");
 661         print_statement(expression->statement);
 662         print_string(")");
 663 }
 664
 665 /**
 666  * Prints an expression with parenthesis if needed.
 667  *
 668  * @param expression  the expression to print
 669  * @param top_prec    the precedence of the user of this expression.
 670  */
 671 static void print_expression_prec(const expression_t *expression, unsigned top_prec)
 672 {
 673         if (expression->kind == EXPR_UNARY_CAST
 674             && expression->base.implicit && !print_implicit_casts) {
 675                 expression = expression->unary.value;
 676         }
 677
 678         bool parenthesized =
 679                 expression->base.parenthesized                 ||
 680                 (print_parenthesis && top_prec != PREC_BOTTOM) ||
 681                 top_prec > get_expression_precedence(expression->base.kind);
 682
 683         if (parenthesized)
 684                 print_string("(");
 685         switch (expression->kind) {
 686         case EXPR_UNKNOWN:
 687         case EXPR_INVALID:
 688                 print_string("$invalid expression$");
 689                 break;
 690         case EXPR_WIDE_STRING_LITERAL:
 691         case EXPR_STRING_LITERAL:
 692                 print_string_literal(&expression->string_literal);
 693                 break;
 694         EXPR_LITERAL_CASES
 695                 print_literal(&expression->literal);
 696                 break;
 697         case EXPR_FUNCNAME:
 698                 print_funcname(&expression->funcname);
 699                 break;
 700         case EXPR_COMPOUND_LITERAL:
 701                 print_compound_literal(&expression->compound_literal);
 702                 break;
 703         case EXPR_CALL:
 704                 print_call_expression(&expression->call);
 705                 break;
 706         EXPR_BINARY_CASES
 707                 print_binary_expression(&expression->binary);
 708                 break;
 709         case EXPR_REFERENCE:
 710         case EXPR_REFERENCE_ENUM_VALUE:
 711                 print_reference_expression(&expression->reference);
 712                 break;
 713         case EXPR_ARRAY_ACCESS:
 714                 print_array_expression(&expression->array_access);
 715                 break;
 716         case EXPR_LABEL_ADDRESS:
 717                 print_label_address_expression(&expression->label_address);
 718                 break;
 719         EXPR_UNARY_CASES
 720                 print_unary_expression(&expression->unary);
 721                 break;
 722         case EXPR_SIZEOF:
 723         case EXPR_ALIGNOF:
 724                 print_typeprop_expression(&expression->typeprop);
 725                 break;
 726         case EXPR_BUILTIN_CONSTANT_P:
 727                 print_builtin_constant(&expression->builtin_constant);
 728                 break;
 729         case EXPR_BUILTIN_TYPES_COMPATIBLE_P:
 730                 print_builtin_types_compatible(&expression->builtin_types_compatible);
 731                 break;
 732         case EXPR_CONDITIONAL:
 733                 print_conditional(&expression->conditional);
 734                 break;
 735         case EXPR_VA_START:
 736                 print_va_start(&expression->va_starte);
 737                 break;
 738         case EXPR_VA_ARG:
 739                 print_va_arg(&expression->va_arge);
 740                 break;
 741         case EXPR_VA_COPY:
 742                 print_va_copy(&expression->va_copye);
 743                 break;
 744         case EXPR_SELECT:
 745                 print_select(&expression->select);
 746                 break;
 747         case EXPR_CLASSIFY_TYPE:
 748                 print_classify_type_expression(&expression->classify_type);
 749                 break;
 750         case EXPR_OFFSETOF:
 751                 print_offsetof_expression(&expression->offsetofe);
 752                 break;
 753         case EXPR_STATEMENT:
 754                 print_statement_expression(&expression->statement);
 755                 break;
 756
 757 #if 0
 758         default:
 759                 /* TODO */
 760                 print_format("some expression of type %d", (int)expression->kind);
 761                 break;
 762 #endif
 763         }
 764         if (parenthesized)
 765                 print_string(")");
 766 }
 767
 768 /**
 769  * Print an compound statement.
 770  *
 771  * @param block  the compound statement
 772  */
 773 static void print_compound_statement(const compound_statement_t *block)
 774 {
 775         print_string("{\n");
 776         ++indent;
 777
 778         statement_t *statement = block->statements;
 779         while (statement != NULL) {
 780                 if (statement->base.kind == STATEMENT_CASE_LABEL)
 781                         --indent;
 782                 if (statement->kind != STATEMENT_LABEL)
 783                         print_indent();
 784                 print_statement(statement);
 785
 786                 statement = statement->base.next;
 787         }
 788         --indent;
 789         print_indent();
 790         print_string(block->stmt_expr ? "}" : "}\n");
 791 }
 792
 793 /**
 794  * Print a return statement.
 795  *
 796  * @param statement  the return statement
 797  */
 798 static void print_return_statement(const return_statement_t *statement)
 799 {
 800         expression_t const *const val = statement->value;
 801         if (val != NULL) {
 802                 print_string("return ");
 803                 print_expression(val);
 804                 print_string(";\n");
 805         } else {
 806                 print_string("return;\n");
 807         }
 808 }
 809
 810 /**
 811  * Print an expression statement.
 812  *
 813  * @param statement  the expression statement
 814  */
 815 static void print_expression_statement(const expression_statement_t *statement)
 816 {
 817         print_expression(statement->expression);
 818         print_string(";\n");
 819 }
 820
 821 /**
 822  * Print a goto statement.
 823  *
 824  * @param statement  the goto statement
 825  */
 826 static void print_goto_statement(const goto_statement_t *statement)
 827 {
 828         print_string("goto ");
 829         if (statement->expression != NULL) {
 830                 print_string("*");
 831                 print_expression(statement->expression);
 832         } else {
 833                 print_string(statement->label->base.symbol->string);
 834         }
 835         print_string(";\n");
 836 }
 837
 838 /**
 839  * Print a label statement.
 840  *
 841  * @param statement  the label statement
 842  */
 843 static void print_label_statement(const label_statement_t *statement)
 844 {
 845         print_format("%s:\n", statement->label->base.symbol->string);
 846         print_indent();
 847         print_statement(statement->statement);
 848 }
 849
 850 /**
 851  * Print an if statement.
 852  *
 853  * @param statement  the if statement
 854  */
 855 static void print_if_statement(const if_statement_t *statement)
 856 {
 857         print_string("if (");
 858         print_expression(statement->condition);
 859         print_string(") ");
 860         print_statement(statement->true_statement);
 861
 862         if (statement->false_statement != NULL) {
 863                 print_indent();
 864                 print_string("else ");
 865                 print_statement(statement->false_statement);
 866         }
 867 }
 868
 869 /**
 870  * Print a switch statement.
 871  *
 872  * @param statement  the switch statement
 873  */
 874 static void print_switch_statement(const switch_statement_t *statement)
 875 {
 876         print_string("switch (");
 877         print_expression(statement->expression);
 878         print_string(") ");
 879         print_statement(statement->body);
 880 }
 881
 882 /**
 883  * Print a case label (including the default label).
 884  *
 885  * @param statement  the case label statement
 886  */
 887 static void print_case_label(const case_label_statement_t *statement)
 888 {
 889         if (statement->expression == NULL) {
 890                 print_string("default:\n");
 891         } else {
 892                 print_string("case ");
 893                 print_expression(statement->expression);
 894                 if (statement->end_range != NULL) {
 895                         print_string(" ... ");
 896                         print_expression(statement->end_range);
 897                 }
 898                 print_string(":\n");
 899         }
 900         ++indent;
 901         if (statement->statement != NULL) {
 902                 if (statement->statement->base.kind == STATEMENT_CASE_LABEL) {
 903                         --indent;
 904                 }
 905                 print_indent();
 906                 print_statement(statement->statement);
 907         }
 908 }
 909
 910 static void print_typedef(const entity_t *entity)
 911 {
 912         print_string("typedef ");
 913         print_type_ext(entity->typedefe.type, entity->base.symbol, NULL);
 914         print_string(";");
 915 }
 916
 917 /**
 918  * returns true if the entity is a compiler generated one and has no real
 919  * correspondenc in the source file
 920  */
 921 static bool is_generated_entity(const entity_t *entity)
 922 {
 923         if (entity->kind == ENTITY_TYPEDEF)
 924                 return entity->typedefe.builtin;
 925
 926         if (is_declaration(entity))
 927                 return entity->declaration.implicit;
 928
 929         return false;
 930 }
 931
 932 /**
 933  * Print a declaration statement.
 934  *
 935  * @param statement   the statement
 936  */
 937 static void print_declaration_statement(
 938                 const declaration_statement_t *statement)
 939 {
 940         bool first = true;
 941         entity_t *entity = statement->declarations_begin;
 942         if (entity == NULL) {
 943                 print_string("/* empty declaration statement */\n");
 944                 return;
 945         }
 946
 947         entity_t *const end = statement->declarations_end->base.next;
 948         for (; entity != end; entity = entity->base.next) {
 949                 if (entity->kind == ENTITY_ENUM_VALUE)
 950                         continue;
 951                 if (is_generated_entity(entity))
 952                         continue;
 953
 954                 if (!first) {
 955                         print_indent();
 956                 } else {
 957                         first = false;
 958                 }
 959
 960                 print_entity(entity);
 961                 print_string("\n");
 962         }
 963 }
 964
 965 /**
 966  * Print a while statement.
 967  *
 968  * @param statement   the statement
 969  */
 970 static void print_while_statement(const while_statement_t *statement)
 971 {
 972         print_string("while (");
 973         print_expression(statement->condition);
 974         print_string(") ");
 975         print_statement(statement->body);
 976 }
 977
 978 /**
 979  * Print a do-while statement.
 980  *
 981  * @param statement   the statement
 982  */
 983 static void print_do_while_statement(const do_while_statement_t *statement)
 984 {
 985         print_string("do ");
 986         print_statement(statement->body);
 987         print_indent();
 988         print_string("while (");
 989         print_expression(statement->condition);
 990         print_string(");\n");
 991 }
 992
 993 /**
 994  * Print a for statement.
 995  *
 996  * @param statement   the statement
 997  */
 998 static void print_for_statement(const for_statement_t *statement)
 999 {
1000         print_string("for (");
1001         if (statement->initialisation != NULL) {
1002                 print_expression(statement->initialisation);
1003                 print_string(";");
1004         } else {
1005                 entity_t const *entity = statement->scope.entities;
1006                 for (; entity != NULL; entity = entity->base.next) {
1007                         if (is_generated_entity(entity))
1008                                 continue;
1009                         /* FIXME display of multiple declarations is wrong */
1010                         print_declaration(entity);
1011                 }
1012         }
1013         if (statement->condition != NULL) {
1014                 print_string(" ");
1015                 print_expression(statement->condition);
1016         }
1017         print_string(";");
1018         if (statement->step != NULL) {
1019                 print_string(" ");
1020                 print_expression(statement->step);
1021         }
1022         print_string(") ");
1023         print_statement(statement->body);
1024 }
1025
1026 /**
1027  * Print assembler arguments.
1028  *
1029  * @param arguments   the arguments
1030  */
1031 static void print_asm_arguments(asm_argument_t *arguments)
1032 {
1033         asm_argument_t *argument = arguments;
1034         for (; argument != NULL; argument = argument->next) {
1035                 if (argument != arguments)
1036                         print_string(", ");
1037
1038                 if (argument->symbol) {
1039                         print_format("[%s] ", argument->symbol->string);
1040                 }
1041                 print_quoted_string(&argument->constraints, '"', 1);
1042                 print_string(" (");
1043                 print_expression(argument->expression);
1044                 print_string(")");
1045         }
1046 }
1047
1048 /**
1049  * Print assembler clobbers.
1050  *
1051  * @param clobbers   the clobbers
1052  */
1053 static void print_asm_clobbers(asm_clobber_t *clobbers)
1054 {
1055         asm_clobber_t *clobber = clobbers;
1056         for (; clobber != NULL; clobber = clobber->next) {
1057                 if (clobber != clobbers)
1058                         print_string(", ");
1059
1060                 print_quoted_string(&clobber->clobber, '"', 1);
1061         }
1062 }
1063
1064 /**
1065  * Print an assembler statement.
1066  *
1067  * @param statement   the statement
1068  */
1069 static void print_asm_statement(const asm_statement_t *statement)
1070 {
1071         print_string("asm ");
1072         if (statement->is_volatile) {
1073                 print_string("volatile ");
1074         }
1075         print_string("(");
1076         print_quoted_string(&statement->asm_text, '"', 1);
1077         if (statement->outputs  == NULL &&
1078             statement->inputs   == NULL &&
1079             statement->clobbers == NULL)
1080                 goto end_of_print_asm_statement;
1081
1082         print_string(" : ");
1083         print_asm_arguments(statement->outputs);
1084         if (statement->inputs == NULL && statement->clobbers == NULL)
1085                 goto end_of_print_asm_statement;
1086
1087         print_string(" : ");
1088         print_asm_arguments(statement->inputs);
1089         if (statement->clobbers == NULL)
1090                 goto end_of_print_asm_statement;
1091
1092         print_string(" : ");
1093         print_asm_clobbers(statement->clobbers);
1094
1095 end_of_print_asm_statement:
1096         print_string(");\n");
1097 }
1098
1099 /**
1100  * Print a microsoft __try statement.
1101  *
1102  * @param statement   the statement
1103  */
1104 static void print_ms_try_statement(const ms_try_statement_t *statement)
1105 {
1106         print_string("__try ");
1107         print_statement(statement->try_statement);
1108         print_indent();
1109         if (statement->except_expression != NULL) {
1110                 print_string("__except(");
1111                 print_expression(statement->except_expression);
1112                 print_string(") ");
1113         } else {
1114                 print_string("__finally ");
1115         }
1116         print_statement(statement->final_statement);
1117 }
1118
1119 /**
1120  * Print a microsoft __leave statement.
1121  *
1122  * @param statement   the statement
1123  */
1124 static void print_leave_statement(const leave_statement_t *statement)
1125 {
1126         (void)statement;
1127         print_string("__leave;\n");
1128 }
1129
1130 /**
1131  * Print a statement.
1132  *
1133  * @param statement   the statement
1134  */
1135 void print_statement(const statement_t *statement)
1136 {
1137         switch (statement->kind) {
1138         case STATEMENT_EMPTY:
1139                 print_string(";\n");
1140                 break;
1141         case STATEMENT_COMPOUND:
1142                 print_compound_statement(&statement->compound);
1143                 break;
1144         case STATEMENT_RETURN:
1145                 print_return_statement(&statement->returns);
1146                 break;
1147         case STATEMENT_EXPRESSION:
1148                 print_expression_statement(&statement->expression);
1149                 break;
1150         case STATEMENT_LABEL:
1151                 print_label_statement(&statement->label);
1152                 break;
1153         case STATEMENT_GOTO:
1154                 print_goto_statement(&statement->gotos);
1155                 break;
1156         case STATEMENT_CONTINUE:
1157                 print_string("continue;\n");
1158                 break;
1159         case STATEMENT_BREAK:
1160                 print_string("break;\n");
1161                 break;
1162         case STATEMENT_IF:
1163                 print_if_statement(&statement->ifs);
1164                 break;
1165         case STATEMENT_SWITCH:
1166                 print_switch_statement(&statement->switchs);
1167                 break;
1168         case STATEMENT_CASE_LABEL:
1169                 print_case_label(&statement->case_label);
1170                 break;
1171         case STATEMENT_DECLARATION:
1172                 print_declaration_statement(&statement->declaration);
1173                 break;
1174         case STATEMENT_WHILE:
1175                 print_while_statement(&statement->whiles);
1176                 break;
1177         case STATEMENT_DO_WHILE:
1178                 print_do_while_statement(&statement->do_while);
1179                 break;
1180         case STATEMENT_FOR:
1181                 print_for_statement(&statement->fors);
1182                 break;
1183         case STATEMENT_ASM:
1184                 print_asm_statement(&statement->asms);
1185                 break;
1186         case STATEMENT_MS_TRY:
1187                 print_ms_try_statement(&statement->ms_try);
1188                 break;
1189         case STATEMENT_LEAVE:
1190                 print_leave_statement(&statement->leave);
1191                 break;
1192         case STATEMENT_INVALID:
1193                 print_string("$invalid statement$\n");
1194                 break;
1195         }
1196 }
1197
1198 /**
1199  * Print a storage class.
1200  *
1201  * @param storage_class   the storage class
1202  */
1203 static void print_storage_class(storage_class_tag_t storage_class)
1204 {
1205         switch (storage_class) {
1206         case STORAGE_CLASS_NONE:     return;
1207         case STORAGE_CLASS_TYPEDEF:  print_string("typedef ");  return;
1208         case STORAGE_CLASS_EXTERN:   print_string("extern ");   return;
1209         case STORAGE_CLASS_STATIC:   print_string("static ");   return;
1210         case STORAGE_CLASS_AUTO:     print_string("auto ");     return;
1211         case STORAGE_CLASS_REGISTER: print_string("register "); return;
1212         }
1213         panic("invalid storage class");
1214 }
1215
1216 /**
1217  * Print an initializer.
1218  *
1219  * @param initializer  the initializer
1220  */
1221 void print_initializer(const initializer_t *initializer)
1222 {
1223         if (initializer == NULL) {
1224                 print_string("{}");
1225                 return;
1226         }
1227
1228         switch (initializer->kind) {
1229         case INITIALIZER_VALUE: {
1230                 const initializer_value_t *value = &initializer->value;
1231                 print_assignment_expression(value->value);
1232                 return;
1233         }
1234         case INITIALIZER_LIST: {
1235                 assert(initializer->kind == INITIALIZER_LIST);
1236                 print_string("{ ");
1237                 const initializer_list_t *list = &initializer->list;
1238
1239                 for (size_t i = 0 ; i < list->len; ++i) {
1240                         const initializer_t *sub_init = list->initializers[i];
1241                         print_initializer(list->initializers[i]);
1242                         if (i < list->len-1) {
1243                                 if (sub_init == NULL || sub_init->kind != INITIALIZER_DESIGNATOR)
1244                                         print_string(", ");
1245                         }
1246                 }
1247                 print_string(" }");
1248                 return;
1249         }
1250         case INITIALIZER_STRING:
1251                 print_quoted_string(&initializer->string.string, '"', 1);
1252                 return;
1253         case INITIALIZER_WIDE_STRING:
1254                 print_quoted_string(&initializer->string.string, '"', 1);
1255                 return;
1256         case INITIALIZER_DESIGNATOR:
1257                 print_designator(initializer->designator.designator);
1258                 print_string(" = ");
1259                 return;
1260         }
1261
1262         panic("invalid initializer kind found");
1263 }
1264
1265 #if 0
1266 /**
1267  * Print microsoft extended declaration modifiers.
1268  */
1269 static void print_ms_modifiers(const declaration_t *declaration)
1270 {
1271         if ((c_mode & _MS) == 0)
1272                 return;
1273
1274         decl_modifiers_t modifiers = declaration->modifiers;
1275
1276         bool        ds_shown = false;
1277         const char *next     = "(";
1278
1279         if (declaration->base.kind == ENTITY_VARIABLE) {
1280                 variable_t *variable = (variable_t*)declaration;
1281                 if (variable->alignment != 0
1282                                 || variable->get_property_sym != NULL
1283                                 || variable->put_property_sym != NULL) {
1284                         if (!ds_shown) {
1285                                 print_string("__declspec");
1286                                 ds_shown = true;
1287                         }
1288
1289                         if (variable->alignment != 0) {
1290                                 print_string(next); next = ", "; print_format("align(%u)", variable->alignment);
1291                         }
1292                         if (variable->get_property_sym != NULL
1293                                         || variable->put_property_sym != NULL) {
1294                                 char *comma = "";
1295                                 print_string(next); next = ", "; print_string("property(");
1296                                 if (variable->get_property_sym != NULL) {
1297                                         print_format("get=%s", variable->get_property_sym->string);
1298                                         comma = ", ";
1299                                 }
1300                                 if (variable->put_property_sym != NULL)
1301                                         print_format("%sput=%s", comma, variable->put_property_sym->string);
1302                                 print_string(")");
1303                         }
1304                 }
1305         }
1306
1307         /* DM_FORCEINLINE handled outside. */
1308         if ((modifiers & ~DM_FORCEINLINE) != 0) {
1309                 if (!ds_shown) {
1310                         print_string("__declspec");
1311                         ds_shown = true;
1312                 }
1313                 if (modifiers & DM_DLLIMPORT) {
1314                         print_string(next); next = ", "; print_string("dllimport");
1315                 }
1316                 if (modifiers & DM_DLLEXPORT) {
1317                         print_string(next); next = ", "; print_string("dllexport");
1318                 }
1319                 if (modifiers & DM_THREAD) {
1320                         print_string(next); next = ", "; print_string("thread");
1321                 }
1322                 if (modifiers & DM_NAKED) {
1323                         print_string(next); next = ", "; print_string("naked");
1324                 }
1325                 if (modifiers & DM_THREAD) {
1326                         print_string(next); next = ", "; print_string("thread");
1327                 }
1328                 if (modifiers & DM_SELECTANY) {
1329                         print_string(next); next = ", "; print_string("selectany");
1330                 }
1331                 if (modifiers & DM_NOTHROW) {
1332                         print_string(next); next = ", "; print_string("nothrow");
1333                 }
1334                 if (modifiers & DM_NORETURN) {
1335                         print_string(next); next = ", "; print_string("noreturn");
1336                 }
1337                 if (modifiers & DM_NOINLINE) {
1338                         print_string(next); next = ", "; print_string("noinline");
1339                 }
1340                 if (modifiers & DM_DEPRECATED) {
1341                         print_string(next); next = ", "; print_string("deprecated");
1342                         if (declaration->deprecated_string != NULL)
1343                                 print_format("(\"%s\")",
1344                                         declaration->deprecated_string);
1345                 }
1346                 if (modifiers & DM_RESTRICT) {
1347                         print_string(next); next = ", "; print_string("restrict");
1348                 }
1349                 if (modifiers & DM_NOALIAS) {
1350                         print_string(next); next = ", "; print_string("noalias");
1351                 }
1352         }
1353
1354         if (ds_shown)
1355                 print_string(") ");
1356 }
1357 #endif
1358
1359 static void print_scope(const scope_t *scope)
1360 {
1361         const entity_t *entity = scope->entities;
1362         for ( ; entity != NULL; entity = entity->base.next) {
1363                 print_indent();
1364                 print_entity(entity);
1365                 print_string("\n");
1366         }
1367 }
1368
1369 static void print_namespace(const namespace_t *namespace)
1370 {
1371         print_string("namespace ");
1372         if (namespace->base.symbol != NULL) {
1373                 print_string(namespace->base.symbol->string);
1374                 print_string(" ");
1375         }
1376
1377         print_string("{\n");
1378         ++indent;
1379
1380         print_scope(&namespace->members);
1381
1382         --indent;
1383         print_indent();
1384         print_string("}\n");
1385 }
1386
1387 /**
1388  * Print a variable or function declaration
1389  */
1390 void print_declaration(const entity_t *entity)
1391 {
1392         assert(is_declaration(entity));
1393         const declaration_t *declaration = &entity->declaration;
1394
1395         print_storage_class((storage_class_tag_t)declaration->declared_storage_class);
1396         if (entity->kind == ENTITY_FUNCTION) {
1397                 function_t *function = (function_t*)declaration;
1398                 if (function->is_inline) {
1399                         if (declaration->modifiers & DM_FORCEINLINE) {
1400                                 print_string("__forceinline ");
1401                         } else if (declaration->modifiers & DM_MICROSOFT_INLINE) {
1402                                 print_string("__inline ");
1403                         } else {
1404                                 print_string("inline ");
1405                         }
1406                 }
1407         }
1408         //print_ms_modifiers(declaration);
1409         switch (entity->kind) {
1410                 case ENTITY_FUNCTION:
1411                         print_type_ext(entity->declaration.type, entity->base.symbol,
1412                                         &entity->function.parameters);
1413
1414                         if (entity->function.statement != NULL) {
1415                                 print_string("\n");
1416                                 print_indent();
1417                                 print_statement(entity->function.statement);
1418                                 return;
1419                         }
1420                         break;
1421
1422                 case ENTITY_VARIABLE:
1423                         if (entity->variable.thread_local)
1424                                 print_string("__thread ");
1425                         print_type_ext(declaration->type, declaration->base.symbol, NULL);
1426                         if (entity->variable.initializer != NULL) {
1427                                 print_string(" = ");
1428                                 print_initializer(entity->variable.initializer);
1429                         }
1430                         break;
1431
1432                 default:
1433                         print_type_ext(declaration->type, declaration->base.symbol, NULL);
1434                         break;
1435         }
1436         print_string(";");
1437 }
1438
1439 /**
1440  * Prints an expression.
1441  *
1442  * @param expression  the expression
1443  */
1444 void print_expression(const expression_t *expression)
1445 {
1446         print_expression_prec(expression, PREC_BOTTOM);
1447 }
1448
1449 /**
1450  * Print a declaration.
1451  *
1452  * @param declaration  the declaration
1453  */
1454 void print_entity(const entity_t *entity)
1455 {
1456         if (entity->base.namespc != NAMESPACE_NORMAL && entity->base.symbol == NULL)
1457                 return;
1458
1459         switch ((entity_kind_tag_t)entity->kind) {
1460         case ENTITY_VARIABLE:
1461         case ENTITY_PARAMETER:
1462         case ENTITY_COMPOUND_MEMBER:
1463         case ENTITY_FUNCTION:
1464                 print_declaration(entity);
1465                 return;
1466         case ENTITY_TYPEDEF:
1467                 print_typedef(entity);
1468                 return;
1469         case ENTITY_CLASS:
1470                 /* TODO */
1471                 print_string("class ");
1472                 print_string(entity->base.symbol->string);
1473                 print_string("; /* TODO */\n");
1474                 return;
1475         case ENTITY_STRUCT:
1476                 print_string("struct ");
1477                 goto print_compound;
1478         case ENTITY_UNION:
1479                 print_string("union ");
1480 print_compound:
1481                 print_string(entity->base.symbol->string);
1482                 if (entity->compound.complete) {
1483                         print_string(" ");
1484                         print_compound_definition(&entity->compound);
1485                 }
1486                 print_string(";");
1487                 return;
1488         case ENTITY_ENUM:
1489                 print_string("enum ");
1490                 print_string(entity->base.symbol->string);
1491                 print_string(" ");
1492                 print_enum_definition(&entity->enume);
1493                 print_string(";");
1494                 return;
1495         case ENTITY_NAMESPACE:
1496                 print_namespace(&entity->namespacee);
1497                 return;
1498         case ENTITY_LOCAL_LABEL:
1499                 print_string("__label__ ");
1500                 print_string(entity->base.symbol->string);
1501                 print_string(";");
1502                 return;
1503         case ENTITY_LABEL:
1504         case ENTITY_ENUM_VALUE:
1505                 panic("print_entity used on unexpected entity type");
1506         case ENTITY_INVALID:
1507                 break;
1508         }
1509         panic("Invalid entity type encountered");
1510 }
1511
1512 /**
1513  * Print the AST of a translation unit.
1514  *
1515  * @param unit   the translation unit
1516  */
1517 void print_ast(const translation_unit_t *unit)
1518 {
1519         entity_t *entity = unit->scope.entities;
1520         for ( ; entity != NULL; entity = entity->base.next) {
1521                 if (entity->kind == ENTITY_ENUM_VALUE)
1522                         continue;
1523                 if (entity->base.namespc != NAMESPACE_NORMAL
1524                                 && entity->base.symbol == NULL)
1525                         continue;
1526                 if (is_generated_entity(entity))
1527                         continue;
1528
1529                 print_indent();
1530                 print_entity(entity);
1531                 print_string("\n");
1532         }
1533 }
1534
1535 expression_classification_t is_constant_initializer(const initializer_t *initializer)
1536 {
1537         switch (initializer->kind) {
1538         case INITIALIZER_STRING:
1539         case INITIALIZER_WIDE_STRING:
1540         case INITIALIZER_DESIGNATOR:
1541                 return EXPR_CLASS_CONSTANT;
1542
1543         case INITIALIZER_VALUE:
1544                 return is_constant_expression(initializer->value.value);
1545
1546         case INITIALIZER_LIST: {
1547                 expression_classification_t all = EXPR_CLASS_CONSTANT;
1548                 for (size_t i = 0; i < initializer->list.len; ++i) {
1549                         initializer_t *sub_initializer = initializer->list.initializers[i];
1550                         expression_classification_t const cur = is_constant_initializer(sub_initializer);
1551                         if (all > cur) {
1552                                 all = cur;
1553                         }
1554                 }
1555                 return all;
1556         }
1557         }
1558         panic("invalid initializer kind found");
1559 }
1560
1561 /**
1562  * Checks if an expression references an object with a constant/known location
1563  * to the linker. Example:
1564  *  - "x", "*&x" with x being a global variable. The value of x need not be
1565  *         constant but the address of x is.
1566  *  - "a.b.c" when a has a constant/known location to the linker
1567  */
1568 static expression_classification_t is_object_with_linker_constant_address(
1569         const expression_t *expression)
1570 {
1571         switch (expression->kind) {
1572         case EXPR_UNARY_DEREFERENCE:
1573                 return is_linker_constant(expression->unary.value);
1574
1575         case EXPR_SELECT: {
1576                 type_t *base_type = skip_typeref(expression->select.compound->base.type);
1577                 if (is_type_pointer(base_type)) {
1578                         /* it's a -> */
1579                         return is_linker_constant(expression->select.compound);
1580                 } else {
1581                         return is_object_with_linker_constant_address(expression->select.compound);
1582                 }
1583         }
1584
1585         case EXPR_ARRAY_ACCESS: {
1586                 expression_classification_t const ref = is_linker_constant(expression->array_access.array_ref);
1587                 expression_classification_t const idx = is_constant_expression(expression->array_access.index);
1588                 return ref < idx ? ref : idx;
1589         }
1590
1591         case EXPR_REFERENCE: {
1592                 entity_t *entity = expression->reference.entity;
1593                 if (!is_declaration(entity))
1594                         return EXPR_CLASS_VARIABLE;
1595
1596                 switch ((storage_class_tag_t)entity->declaration.storage_class) {
1597                 case STORAGE_CLASS_NONE:
1598                 case STORAGE_CLASS_EXTERN:
1599                 case STORAGE_CLASS_STATIC:
1600                         return
1601                                 entity->kind != ENTITY_VARIABLE ||
1602                                 !entity->variable.thread_local ? EXPR_CLASS_CONSTANT :
1603                                 EXPR_CLASS_VARIABLE;
1604
1605                 case STORAGE_CLASS_REGISTER:
1606                 case STORAGE_CLASS_TYPEDEF:
1607                 case STORAGE_CLASS_AUTO:
1608                         break;
1609                 }
1610                 return EXPR_CLASS_VARIABLE;
1611         }
1612
1613         case EXPR_INVALID:
1614                 return EXPR_CLASS_ERROR;
1615
1616         default:
1617                 return EXPR_CLASS_VARIABLE;
1618         }
1619 }
1620
1621 expression_classification_t is_linker_constant(const expression_t *expression)
1622 {
1623         switch (expression->kind) {
1624         case EXPR_STRING_LITERAL:
1625         case EXPR_WIDE_STRING_LITERAL:
1626         case EXPR_FUNCNAME:
1627         case EXPR_LABEL_ADDRESS:
1628                 return EXPR_CLASS_CONSTANT;
1629
1630         case EXPR_UNARY_TAKE_ADDRESS:
1631                 return is_object_with_linker_constant_address(expression->unary.value);
1632
1633         case EXPR_UNARY_DEREFERENCE: {
1634                 type_t *real_type
1635                         = revert_automatic_type_conversion(expression->unary.value);
1636                 /* dereferencing a function is a NOP */
1637                 if (is_type_function(real_type)) {
1638                         return is_linker_constant(expression->unary.value);
1639                 }
1640                 /* FALLTHROUGH */
1641         }
1642
1643         case EXPR_UNARY_CAST: {
1644                 type_t *dest = skip_typeref(expression->base.type);
1645                 if (!is_type_pointer(dest) && (
1646                                 dest->kind != TYPE_ATOMIC                                               ||
1647                                 !(get_atomic_type_flags(dest->atomic.akind) & ATOMIC_TYPE_FLAG_INTEGER) ||
1648                                 get_atomic_type_size(dest->atomic.akind) < get_atomic_type_size(get_intptr_kind())
1649                     ))
1650                         return EXPR_CLASS_VARIABLE;
1651
1652                 expression_classification_t const expr = is_constant_expression(expression->unary.value);
1653                 expression_classification_t const addr = is_linker_constant(expression->unary.value);
1654                 return expr > addr ? expr : addr;
1655         }
1656
1657         case EXPR_BINARY_ADD:
1658         case EXPR_BINARY_SUB: {
1659                 expression_t *const left  = expression->binary.left;
1660                 expression_t *const right = expression->binary.right;
1661                 type_t       *const ltype = skip_typeref(left->base.type);
1662                 type_t       *const rtype = skip_typeref(right->base.type);
1663
1664                 if (is_type_pointer(ltype)) {
1665                         expression_classification_t const l = is_linker_constant(left);
1666                         expression_classification_t const r = is_constant_expression(right);
1667                         return l < r ? l : r;
1668                 } else if (is_type_pointer(rtype)) {
1669                         expression_classification_t const l = is_constant_expression(left);
1670                         expression_classification_t const r = is_linker_constant(right);
1671                         return l < r ? l : r;
1672                 } else if (!is_type_valid(ltype) || !is_type_valid(rtype)) {
1673                         return EXPR_CLASS_ERROR;
1674                 } else {
1675                         return EXPR_CLASS_VARIABLE;
1676                 }
1677         }
1678
1679         case EXPR_REFERENCE: {
1680                 entity_t *entity = expression->reference.entity;
1681                 if (!is_declaration(entity))
1682                         return EXPR_CLASS_VARIABLE;
1683
1684                 type_t *type = skip_typeref(entity->declaration.type);
1685                 if (is_type_function(type))
1686                         return EXPR_CLASS_CONSTANT;
1687                 if (is_type_array(type)) {
1688                         return is_object_with_linker_constant_address(expression);
1689                 }
1690                 /* Prevent stray errors */
1691                 if (!is_type_valid(type))
1692                         return EXPR_CLASS_ERROR;
1693                 return EXPR_CLASS_VARIABLE;
1694         }
1695
1696         case EXPR_ARRAY_ACCESS: {
1697                 type_t *const type =
1698                         skip_typeref(revert_automatic_type_conversion(expression));
1699                 if (!is_type_array(type))
1700                         return EXPR_CLASS_VARIABLE;
1701                 expression_classification_t const ref = is_linker_constant(expression->array_access.array_ref);
1702                 expression_classification_t const idx = is_constant_expression(expression->array_access.index);
1703                 return ref < idx ? ref : idx;
1704         }
1705
1706         case EXPR_CONDITIONAL: {
1707                 expression_t *const c = expression->conditional.condition;
1708                 expression_classification_t const cclass = is_constant_expression(c);
1709                 if (cclass != EXPR_CLASS_CONSTANT)
1710                         return cclass;
1711
1712                 if (fold_constant_to_bool(c)) {
1713                         expression_t const *const t = expression->conditional.true_expression;
1714                         return is_linker_constant(t != NULL ? t : c);
1715                 } else {
1716                         return is_linker_constant(expression->conditional.false_expression);
1717                 }
1718         }
1719
1720         case EXPR_SELECT: {
1721                 entity_t *entity = expression->select.compound_entry;
1722                 if (!is_declaration(entity))
1723                         return EXPR_CLASS_VARIABLE;
1724                 type_t *type = skip_typeref(entity->declaration.type);
1725                 if (is_type_array(type)) {
1726                         /* arrays automatically convert to their address */
1727                         expression_t *compound  = expression->select.compound;
1728                         type_t       *base_type = skip_typeref(compound->base.type);
1729                         if (is_type_pointer(base_type)) {
1730                                 /* it's a -> */
1731                                 return is_linker_constant(compound);
1732                         } else {
1733                                 return is_object_with_linker_constant_address(compound);
1734                         }
1735                 }
1736                 return EXPR_CLASS_VARIABLE;
1737         }
1738
1739         case EXPR_INVALID:
1740                 return EXPR_CLASS_ERROR;
1741
1742         default:
1743                 return EXPR_CLASS_VARIABLE;
1744         }
1745 }
1746
1747 /**
1748  * Check if the given expression is a call to a builtin function
1749  * returning a constant result.
1750  */
1751 static expression_classification_t is_builtin_const_call(const expression_t *expression)
1752 {
1753         expression_t *function = expression->call.function;
1754         if (function->kind != EXPR_REFERENCE)
1755                 return EXPR_CLASS_VARIABLE;
1756         reference_expression_t *ref = &function->reference;
1757         if (ref->entity->kind != ENTITY_FUNCTION)
1758                 return EXPR_CLASS_VARIABLE;
1759
1760         switch (ref->entity->function.btk) {
1761         case bk_gnu_builtin_huge_val:
1762         case bk_gnu_builtin_huge_valf:
1763         case bk_gnu_builtin_huge_vall:
1764         case bk_gnu_builtin_inf:
1765         case bk_gnu_builtin_inff:
1766         case bk_gnu_builtin_infl:
1767         case bk_gnu_builtin_nan:
1768         case bk_gnu_builtin_nanf:
1769         case bk_gnu_builtin_nanl:
1770                 return EXPR_CLASS_CONSTANT;
1771         default:
1772                 return EXPR_CLASS_VARIABLE;
1773         }
1774
1775 }
1776
1777 static expression_classification_t is_constant_pointer(const expression_t *expression)
1778 {
1779         expression_classification_t const expr_class = is_constant_expression(expression);
1780         if (expr_class != EXPR_CLASS_VARIABLE)
1781                 return expr_class;
1782
1783         switch (expression->kind) {
1784         case EXPR_UNARY_CAST:
1785                 return is_constant_pointer(expression->unary.value);
1786         default:
1787                 return EXPR_CLASS_VARIABLE;
1788         }
1789 }
1790
1791 static expression_classification_t is_object_with_constant_address(const expression_t *expression)
1792 {
1793         switch (expression->kind) {
1794         case EXPR_SELECT: {
1795                 expression_t *compound      = expression->select.compound;
1796                 type_t       *compound_type = compound->base.type;
1797                 compound_type = skip_typeref(compound_type);
1798                 if (is_type_pointer(compound_type)) {
1799                         return is_constant_pointer(compound);
1800                 } else {
1801                         return is_object_with_constant_address(compound);
1802                 }
1803         }
1804
1805         case EXPR_ARRAY_ACCESS: {
1806                 array_access_expression_t const* const array_access =
1807                         &expression->array_access;
1808                 expression_classification_t const idx_class = is_constant_expression(array_access->index);
1809                 if (idx_class != EXPR_CLASS_CONSTANT)
1810                         return idx_class;
1811                 expression_classification_t const ref_addr = is_object_with_constant_address(array_access->array_ref);
1812                 expression_classification_t const ref_ptr  = is_constant_pointer(array_access->array_ref);
1813                 return ref_addr > ref_ptr ? ref_addr : ref_ptr;
1814         }
1815
1816         case EXPR_UNARY_DEREFERENCE:
1817                 return is_constant_pointer(expression->unary.value);
1818
1819         case EXPR_INVALID:
1820                 return EXPR_CLASS_ERROR;
1821
1822         default:
1823                 return EXPR_CLASS_VARIABLE;
1824         }
1825 }
1826
1827 expression_classification_t is_constant_expression(const expression_t *expression)
1828 {
1829         switch (expression->kind) {
1830         EXPR_LITERAL_CASES
1831         case EXPR_CLASSIFY_TYPE:
1832         case EXPR_OFFSETOF:
1833         case EXPR_ALIGNOF:
1834         case EXPR_BUILTIN_CONSTANT_P:
1835         case EXPR_BUILTIN_TYPES_COMPATIBLE_P:
1836         case EXPR_REFERENCE_ENUM_VALUE:
1837                 return EXPR_CLASS_CONSTANT;
1838
1839         case EXPR_SIZEOF: {
1840                 type_t *const type = skip_typeref(expression->typeprop.type);
1841                 return
1842                         !is_type_array(type) || !type->array.is_vla ? EXPR_CLASS_CONSTANT :
1843                         EXPR_CLASS_VARIABLE;
1844         }
1845
1846         case EXPR_STRING_LITERAL:
1847         case EXPR_WIDE_STRING_LITERAL:
1848         case EXPR_FUNCNAME:
1849         case EXPR_LABEL_ADDRESS:
1850         case EXPR_SELECT:
1851         case EXPR_VA_START:
1852         case EXPR_VA_ARG:
1853         case EXPR_VA_COPY:
1854         case EXPR_STATEMENT:
1855         case EXPR_UNARY_POSTFIX_INCREMENT:
1856         case EXPR_UNARY_POSTFIX_DECREMENT:
1857         case EXPR_UNARY_PREFIX_INCREMENT:
1858         case EXPR_UNARY_PREFIX_DECREMENT:
1859         case EXPR_UNARY_ASSUME: /* has VOID type */
1860         case EXPR_UNARY_DEREFERENCE:
1861         case EXPR_UNARY_DELETE:
1862         case EXPR_UNARY_DELETE_ARRAY:
1863         case EXPR_UNARY_THROW:
1864         case EXPR_BINARY_ASSIGN:
1865         case EXPR_BINARY_MUL_ASSIGN:
1866         case EXPR_BINARY_DIV_ASSIGN:
1867         case EXPR_BINARY_MOD_ASSIGN:
1868         case EXPR_BINARY_ADD_ASSIGN:
1869         case EXPR_BINARY_SUB_ASSIGN:
1870         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
1871         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
1872         case EXPR_BINARY_BITWISE_AND_ASSIGN:
1873         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
1874         case EXPR_BINARY_BITWISE_OR_ASSIGN:
1875         case EXPR_BINARY_COMMA:
1876         case EXPR_ARRAY_ACCESS:
1877                 return EXPR_CLASS_VARIABLE;
1878
1879         case EXPR_REFERENCE: {
1880                 type_t *const type = skip_typeref(expression->base.type);
1881                 return is_type_valid(type) ? EXPR_CLASS_VARIABLE : EXPR_CLASS_ERROR;
1882         }
1883
1884         case EXPR_UNARY_TAKE_ADDRESS:
1885                 return is_object_with_constant_address(expression->unary.value);
1886
1887         case EXPR_CALL:
1888                 return is_builtin_const_call(expression);
1889
1890         case EXPR_UNARY_NEGATE:
1891         case EXPR_UNARY_PLUS:
1892         case EXPR_UNARY_BITWISE_NEGATE:
1893         case EXPR_UNARY_NOT:
1894                 return is_constant_expression(expression->unary.value);
1895
1896         case EXPR_UNARY_CAST: {
1897                 type_t *const type = skip_typeref(expression->base.type);
1898                 if (is_type_scalar(type))
1899                         return is_constant_expression(expression->unary.value);
1900                 if (!is_type_valid(type))
1901                         return EXPR_CLASS_ERROR;
1902                 return EXPR_CLASS_VARIABLE;
1903         }
1904
1905         case EXPR_BINARY_ADD:
1906         case EXPR_BINARY_SUB:
1907         case EXPR_BINARY_MUL:
1908         case EXPR_BINARY_DIV:
1909         case EXPR_BINARY_MOD:
1910         case EXPR_BINARY_EQUAL:
1911         case EXPR_BINARY_NOTEQUAL:
1912         case EXPR_BINARY_LESS:
1913         case EXPR_BINARY_LESSEQUAL:
1914         case EXPR_BINARY_GREATER:
1915         case EXPR_BINARY_GREATEREQUAL:
1916         case EXPR_BINARY_BITWISE_AND:
1917         case EXPR_BINARY_BITWISE_OR:
1918         case EXPR_BINARY_BITWISE_XOR:
1919         case EXPR_BINARY_SHIFTLEFT:
1920         case EXPR_BINARY_SHIFTRIGHT:
1921         case EXPR_BINARY_ISGREATER:
1922         case EXPR_BINARY_ISGREATEREQUAL:
1923         case EXPR_BINARY_ISLESS:
1924         case EXPR_BINARY_ISLESSEQUAL:
1925         case EXPR_BINARY_ISLESSGREATER:
1926         case EXPR_BINARY_ISUNORDERED: {
1927                 expression_classification_t const l = is_constant_expression(expression->binary.left);
1928                 expression_classification_t const r = is_constant_expression(expression->binary.right);
1929                 return l < r ? l : r;
1930         }
1931
1932         case EXPR_BINARY_LOGICAL_AND: {
1933                 expression_t const         *const left   = expression->binary.left;
1934                 expression_classification_t const lclass = is_constant_expression(left);
1935                 if (lclass != EXPR_CLASS_CONSTANT)
1936                         return lclass;
1937                 if (!fold_constant_to_bool(left))
1938                         return EXPR_CLASS_CONSTANT;
1939                 return is_constant_expression(expression->binary.right);
1940         }
1941
1942         case EXPR_BINARY_LOGICAL_OR: {
1943                 expression_t const         *const left   = expression->binary.left;
1944                 expression_classification_t const lclass = is_constant_expression(left);
1945                 if (lclass != EXPR_CLASS_CONSTANT)
1946                         return lclass;
1947                 if (fold_constant_to_bool(left))
1948                         return EXPR_CLASS_CONSTANT;
1949                 return is_constant_expression(expression->binary.right);
1950         }
1951
1952         case EXPR_COMPOUND_LITERAL:
1953                 return is_constant_initializer(expression->compound_literal.initializer);
1954
1955         case EXPR_CONDITIONAL: {
1956                 expression_t               *const condition = expression->conditional.condition;
1957                 expression_classification_t const cclass    = is_constant_expression(condition);
1958                 if (cclass != EXPR_CLASS_CONSTANT)
1959                         return cclass;
1960
1961                 if (fold_constant_to_bool(condition)) {
1962                         expression_t const *const t = expression->conditional.true_expression;
1963                         return t == NULL ? EXPR_CLASS_CONSTANT : is_constant_expression(t);
1964                 } else {
1965                         return is_constant_expression(expression->conditional.false_expression);
1966                 }
1967         }
1968
1969         case EXPR_INVALID:
1970                 return EXPR_CLASS_ERROR;
1971
1972         case EXPR_UNKNOWN:
1973                 break;
1974         }
1975         panic("invalid expression found (is constant expression)");
1976 }
1977
1978 void init_ast(void)
1979 {
1980         obstack_init(&ast_obstack);
1981 }
1982
1983 void exit_ast(void)
1984 {
1985         obstack_free(&ast_obstack, NULL);
1986 }