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_stringrep(const string_t *string)
  70 {
  71         for (size_t i = 0; i < string->size; ++i) {
  72                 print_char(string->begin[i]);
  73         }
  74 }
  75
  76 /**
  77  * Returns 1 if a given precedence level has right-to-left
  78  * associativity, else 0.
  79  *
  80  * @param precedence   the operator precedence
  81  */
  82 static int right_to_left(unsigned precedence)
  83 {
  84         switch (precedence) {
  85         case PREC_ASSIGNMENT:
  86         case PREC_CONDITIONAL:
  87         case PREC_UNARY:
  88                 return 1;
  89
  90         default:
  91                 return 0;
  92         }
  93 }
  94
  95 /**
  96  * Return the precedence of an expression given by its kind.
  97  *
  98  * @param kind   the expression kind
  99  */
 100 static unsigned get_expression_precedence(expression_kind_t kind)
 101 {
 102         static const unsigned prec[] = {
 103                 [EXPR_INVALID]                           = PREC_PRIMARY,
 104                 [EXPR_REFERENCE]                         = PREC_PRIMARY,
 105                 [EXPR_REFERENCE_ENUM_VALUE]              = PREC_PRIMARY,
 106                 [EXPR_LITERAL_INTEGER]                   = PREC_PRIMARY,
 107                 [EXPR_LITERAL_INTEGER_OCTAL]             = PREC_PRIMARY,
 108                 [EXPR_LITERAL_INTEGER_HEXADECIMAL]       = PREC_PRIMARY,
 109                 [EXPR_LITERAL_FLOATINGPOINT]             = PREC_PRIMARY,
 110                 [EXPR_LITERAL_FLOATINGPOINT_HEXADECIMAL] = PREC_PRIMARY,
 111                 [EXPR_LITERAL_CHARACTER]                 = PREC_PRIMARY,
 112                 [EXPR_LITERAL_WIDE_CHARACTER]            = PREC_PRIMARY,
 113                 [EXPR_LITERAL_MS_NOOP]                   = PREC_PRIMARY,
 114                 [EXPR_STRING_LITERAL]                    = PREC_PRIMARY,
 115                 [EXPR_WIDE_STRING_LITERAL]               = PREC_PRIMARY,
 116                 [EXPR_COMPOUND_LITERAL]                  = PREC_UNARY,
 117                 [EXPR_CALL]                              = PREC_POSTFIX,
 118                 [EXPR_CONDITIONAL]                       = PREC_CONDITIONAL,
 119                 [EXPR_SELECT]                            = PREC_POSTFIX,
 120                 [EXPR_ARRAY_ACCESS]                      = PREC_POSTFIX,
 121                 [EXPR_SIZEOF]                            = PREC_UNARY,
 122                 [EXPR_CLASSIFY_TYPE]                     = PREC_UNARY,
 123                 [EXPR_ALIGNOF]                           = PREC_UNARY,
 124
 125                 [EXPR_FUNCNAME]                          = PREC_PRIMARY,
 126                 [EXPR_BUILTIN_CONSTANT_P]                = PREC_PRIMARY,
 127                 [EXPR_BUILTIN_TYPES_COMPATIBLE_P]        = PREC_PRIMARY,
 128                 [EXPR_OFFSETOF]                          = PREC_PRIMARY,
 129                 [EXPR_VA_START]                          = PREC_PRIMARY,
 130                 [EXPR_VA_ARG]                            = PREC_PRIMARY,
 131                 [EXPR_VA_COPY]                           = PREC_PRIMARY,
 132                 [EXPR_STATEMENT]                         = PREC_PRIMARY,
 133                 [EXPR_LABEL_ADDRESS]                     = PREC_PRIMARY,
 134
 135                 [EXPR_UNARY_NEGATE]                      = PREC_UNARY,
 136                 [EXPR_UNARY_PLUS]                        = PREC_UNARY,
 137                 [EXPR_UNARY_BITWISE_NEGATE]              = PREC_UNARY,
 138                 [EXPR_UNARY_NOT]                         = PREC_UNARY,
 139                 [EXPR_UNARY_DEREFERENCE]                 = PREC_UNARY,
 140                 [EXPR_UNARY_TAKE_ADDRESS]                = PREC_UNARY,
 141                 [EXPR_UNARY_POSTFIX_INCREMENT]           = PREC_POSTFIX,
 142                 [EXPR_UNARY_POSTFIX_DECREMENT]           = PREC_POSTFIX,
 143                 [EXPR_UNARY_PREFIX_INCREMENT]            = PREC_UNARY,
 144                 [EXPR_UNARY_PREFIX_DECREMENT]            = PREC_UNARY,
 145                 [EXPR_UNARY_CAST]                        = PREC_UNARY,
 146                 [EXPR_UNARY_ASSUME]                      = PREC_PRIMARY,
 147                 [EXPR_UNARY_DELETE]                      = PREC_UNARY,
 148                 [EXPR_UNARY_DELETE_ARRAY]                = PREC_UNARY,
 149                 [EXPR_UNARY_THROW]                       = PREC_ASSIGNMENT,
 150
 151                 [EXPR_BINARY_ADD]                        = PREC_ADDITIVE,
 152                 [EXPR_BINARY_SUB]                        = PREC_ADDITIVE,
 153                 [EXPR_BINARY_MUL]                        = PREC_MULTIPLICATIVE,
 154                 [EXPR_BINARY_DIV]                        = PREC_MULTIPLICATIVE,
 155                 [EXPR_BINARY_MOD]                        = PREC_MULTIPLICATIVE,
 156                 [EXPR_BINARY_EQUAL]                      = PREC_EQUALITY,
 157                 [EXPR_BINARY_NOTEQUAL]                   = PREC_EQUALITY,
 158                 [EXPR_BINARY_LESS]                       = PREC_RELATIONAL,
 159                 [EXPR_BINARY_LESSEQUAL]                  = PREC_RELATIONAL,
 160                 [EXPR_BINARY_GREATER]                    = PREC_RELATIONAL,
 161                 [EXPR_BINARY_GREATEREQUAL]               = PREC_RELATIONAL,
 162                 [EXPR_BINARY_BITWISE_AND]                = PREC_AND,
 163                 [EXPR_BINARY_BITWISE_OR]                 = PREC_OR,
 164                 [EXPR_BINARY_BITWISE_XOR]                = PREC_XOR,
 165                 [EXPR_BINARY_LOGICAL_AND]                = PREC_LOGICAL_AND,
 166                 [EXPR_BINARY_LOGICAL_OR]                 = PREC_LOGICAL_OR,
 167                 [EXPR_BINARY_SHIFTLEFT]                  = PREC_SHIFT,
 168                 [EXPR_BINARY_SHIFTRIGHT]                 = PREC_SHIFT,
 169                 [EXPR_BINARY_ASSIGN]                     = PREC_ASSIGNMENT,
 170                 [EXPR_BINARY_MUL_ASSIGN]                 = PREC_ASSIGNMENT,
 171                 [EXPR_BINARY_DIV_ASSIGN]                 = PREC_ASSIGNMENT,
 172                 [EXPR_BINARY_MOD_ASSIGN]                 = PREC_ASSIGNMENT,
 173                 [EXPR_BINARY_ADD_ASSIGN]                 = PREC_ASSIGNMENT,
 174                 [EXPR_BINARY_SUB_ASSIGN]                 = PREC_ASSIGNMENT,
 175                 [EXPR_BINARY_SHIFTLEFT_ASSIGN]           = PREC_ASSIGNMENT,
 176                 [EXPR_BINARY_SHIFTRIGHT_ASSIGN]          = PREC_ASSIGNMENT,
 177                 [EXPR_BINARY_BITWISE_AND_ASSIGN]         = PREC_ASSIGNMENT,
 178                 [EXPR_BINARY_BITWISE_XOR_ASSIGN]         = PREC_ASSIGNMENT,
 179                 [EXPR_BINARY_BITWISE_OR_ASSIGN]          = PREC_ASSIGNMENT,
 180                 [EXPR_BINARY_COMMA]                      = PREC_EXPRESSION,
 181
 182                 [EXPR_BINARY_ISGREATER]                  = PREC_PRIMARY,
 183                 [EXPR_BINARY_ISGREATEREQUAL]             = PREC_PRIMARY,
 184                 [EXPR_BINARY_ISLESS]                     = PREC_PRIMARY,
 185                 [EXPR_BINARY_ISLESSEQUAL]                = PREC_PRIMARY,
 186                 [EXPR_BINARY_ISLESSGREATER]              = PREC_PRIMARY,
 187                 [EXPR_BINARY_ISUNORDERED]                = PREC_PRIMARY
 188         };
 189         assert((size_t)kind < lengthof(prec));
 190         unsigned res = prec[kind];
 191
 192         assert(res != PREC_BOTTOM);
 193         return res;
 194 }
 195
 196 /**
 197  * Print a quoted string constant.
 198  *
 199  * @param string  the string constant
 200  * @param border  the border char
 201  * @param skip    number of chars to skip at the end
 202  */
 203 static void print_quoted_string(const string_t *const string, char border,
 204                                 int skip)
 205 {
 206         print_char(border);
 207         const char *end = string->begin + string->size - skip;
 208         for (const char *c = string->begin; c != end; ++c) {
 209                 const char tc = *c;
 210                 if (tc == border) {
 211                         print_string("\\");
 212                 }
 213                 switch (tc) {
 214                 case '\\': print_string("\\\\"); break;
 215                 case '\a': print_string("\\a"); break;
 216                 case '\b': print_string("\\b"); break;
 217                 case '\f': print_string("\\f"); break;
 218                 case '\n': print_string("\\n"); break;
 219                 case '\r': print_string("\\r"); break;
 220                 case '\t': print_string("\\t"); break;
 221                 case '\v': print_string("\\v"); break;
 222                 case '\?': print_string("\\?"); break;
 223                 case 27:
 224                         if (c_mode & _GNUC) {
 225                                 print_string("\\e"); break;
 226                         }
 227                         /* FALLTHROUGH */
 228                 default:
 229                         if ((unsigned)tc < 0x80 && !isprint(tc)) {
 230                                 print_format("\\%03o", (unsigned)tc);
 231                         } else {
 232                                 print_char(tc);
 233                         }
 234                         break;
 235                 }
 236         }
 237         print_char(border);
 238 }
 239
 240 static void print_string_literal(const string_literal_expression_t *literal)
 241 {
 242         if (literal->base.kind == EXPR_WIDE_STRING_LITERAL) {
 243                 print_char('L');
 244         }
 245         print_quoted_string(&literal->value, '"', 1);
 246 }
 247
 248 static void print_literal(const literal_expression_t *literal)
 249 {
 250         switch (literal->base.kind) {
 251         case EXPR_LITERAL_MS_NOOP:
 252                 print_string("__noop");
 253                 return;
 254         case EXPR_LITERAL_INTEGER_HEXADECIMAL:
 255         case EXPR_LITERAL_FLOATINGPOINT_HEXADECIMAL:
 256                 print_string("0x");
 257                 /* FALLTHROUGH */
 258         case EXPR_LITERAL_BOOLEAN:
 259         case EXPR_LITERAL_INTEGER:
 260         case EXPR_LITERAL_INTEGER_OCTAL:
 261         case EXPR_LITERAL_FLOATINGPOINT:
 262                 print_stringrep(&literal->value);
 263                 if (literal->suffix.size > 0)
 264                         print_stringrep(&literal->suffix);
 265                 return;
 266         case EXPR_LITERAL_WIDE_CHARACTER:
 267                 print_char('L');
 268                 /* FALLTHROUGH */
 269         case EXPR_LITERAL_CHARACTER:
 270                 print_quoted_string(&literal->value, '\'', 0);
 271                 return;
 272         default:
 273                 break;
 274         }
 275         print_string("INVALID LITERAL KIND");
 276 }
 277
 278 /**
 279  * Prints a predefined symbol.
 280  */
 281 static void print_funcname(const funcname_expression_t *funcname)
 282 {
 283         const char *s = "";
 284         switch (funcname->kind) {
 285         case FUNCNAME_FUNCTION:        s = (c_mode & _C99) ? "__func__" : "__FUNCTION__"; break;
 286         case FUNCNAME_PRETTY_FUNCTION: s = "__PRETTY_FUNCTION__"; break;
 287         case FUNCNAME_FUNCSIG:         s = "__FUNCSIG__"; break;
 288         case FUNCNAME_FUNCDNAME:       s = "__FUNCDNAME__"; break;
 289         }
 290         print_string(s);
 291 }
 292
 293 static void print_compound_literal(
 294                 const compound_literal_expression_t *expression)
 295 {
 296         print_string("(");
 297         print_type(expression->type);
 298         print_string(")");
 299         print_initializer(expression->initializer);
 300 }
 301
 302 static void print_assignment_expression(const expression_t *const expr)
 303 {
 304         print_expression_prec(expr, PREC_ASSIGNMENT);
 305 }
 306
 307 /**
 308  * Prints a call expression.
 309  *
 310  * @param call  the call expression
 311  */
 312 static void print_call_expression(const call_expression_t *call)
 313 {
 314         print_expression_prec(call->function, PREC_POSTFIX);
 315         print_string("(");
 316         call_argument_t *argument = call->arguments;
 317         int              first    = 1;
 318         while (argument != NULL) {
 319                 if (!first) {
 320                         print_string(", ");
 321                 } else {
 322                         first = 0;
 323                 }
 324                 print_assignment_expression(argument->expression);
 325
 326                 argument = argument->next;
 327         }
 328         print_string(")");
 329 }
 330
 331 /**
 332  * Prints a binary expression.
 333  *
 334  * @param binexpr   the binary expression
 335  */
 336 static void print_binary_expression(const binary_expression_t *binexpr)
 337 {
 338         unsigned prec = get_expression_precedence(binexpr->base.kind);
 339         int      r2l  = right_to_left(prec);
 340
 341         print_expression_prec(binexpr->left, prec + r2l);
 342         char const* op;
 343         switch (binexpr->base.kind) {
 344         case EXPR_BINARY_COMMA:              op = ", ";    break;
 345         case EXPR_BINARY_ASSIGN:             op = " = ";   break;
 346         case EXPR_BINARY_ADD:                op = " + ";   break;
 347         case EXPR_BINARY_SUB:                op = " - ";   break;
 348         case EXPR_BINARY_MUL:                op = " * ";   break;
 349         case EXPR_BINARY_MOD:                op = " % ";   break;
 350         case EXPR_BINARY_DIV:                op = " / ";   break;
 351         case EXPR_BINARY_BITWISE_OR:         op = " | ";   break;
 352         case EXPR_BINARY_BITWISE_AND:        op = " & ";   break;
 353         case EXPR_BINARY_BITWISE_XOR:        op = " ^ ";   break;
 354         case EXPR_BINARY_LOGICAL_OR:         op = " || ";  break;
 355         case EXPR_BINARY_LOGICAL_AND:        op = " && ";  break;
 356         case EXPR_BINARY_NOTEQUAL:           op = " != ";  break;
 357         case EXPR_BINARY_EQUAL:              op = " == ";  break;
 358         case EXPR_BINARY_LESS:               op = " < ";   break;
 359         case EXPR_BINARY_LESSEQUAL:          op = " <= ";  break;
 360         case EXPR_BINARY_GREATER:            op = " > ";   break;
 361         case EXPR_BINARY_GREATEREQUAL:       op = " >= ";  break;
 362         case EXPR_BINARY_SHIFTLEFT:          op = " << ";  break;
 363         case EXPR_BINARY_SHIFTRIGHT:         op = " >> ";  break;
 364
 365         case EXPR_BINARY_ADD_ASSIGN:         op = " += ";  break;
 366         case EXPR_BINARY_SUB_ASSIGN:         op = " -= ";  break;
 367         case EXPR_BINARY_MUL_ASSIGN:         op = " *= ";  break;
 368         case EXPR_BINARY_MOD_ASSIGN:         op = " %= ";  break;
 369         case EXPR_BINARY_DIV_ASSIGN:         op = " /= ";  break;
 370         case EXPR_BINARY_BITWISE_OR_ASSIGN:  op = " |= ";  break;
 371         case EXPR_BINARY_BITWISE_AND_ASSIGN: op = " &= ";  break;
 372         case EXPR_BINARY_BITWISE_XOR_ASSIGN: op = " ^= ";  break;
 373         case EXPR_BINARY_SHIFTLEFT_ASSIGN:   op = " <<= "; break;
 374         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:  op = " >>= "; break;
 375         default: panic("invalid binexpression found");
 376         }
 377         print_string(op);
 378         print_expression_prec(binexpr->right, prec + 1 - r2l);
 379 }
 380
 381 /**
 382  * Prints an unary expression.
 383  *
 384  * @param unexpr   the unary expression
 385  */
 386 static void print_unary_expression(const unary_expression_t *unexpr)
 387 {
 388         unsigned prec = get_expression_precedence(unexpr->base.kind);
 389         switch (unexpr->base.kind) {
 390         case EXPR_UNARY_NEGATE:           print_string("-"); break;
 391         case EXPR_UNARY_PLUS:             print_string("+"); break;
 392         case EXPR_UNARY_NOT:              print_string("!"); break;
 393         case EXPR_UNARY_BITWISE_NEGATE:   print_string("~"); break;
 394         case EXPR_UNARY_PREFIX_INCREMENT: print_string("++"); break;
 395         case EXPR_UNARY_PREFIX_DECREMENT: print_string("--"); break;
 396         case EXPR_UNARY_DEREFERENCE:      print_string("*"); break;
 397         case EXPR_UNARY_TAKE_ADDRESS:     print_string("&"); break;
 398         case EXPR_UNARY_DELETE:           print_string("delete "); break;
 399         case EXPR_UNARY_DELETE_ARRAY:     print_string("delete [] "); break;
 400
 401         case EXPR_UNARY_POSTFIX_INCREMENT:
 402                 print_expression_prec(unexpr->value, prec);
 403                 print_string("++");
 404                 return;
 405         case EXPR_UNARY_POSTFIX_DECREMENT:
 406                 print_expression_prec(unexpr->value, prec);
 407                 print_string("--");
 408                 return;
 409         case EXPR_UNARY_CAST:
 410                 print_string("(");
 411                 print_type(unexpr->base.type);
 412                 print_string(")");
 413                 break;
 414         case EXPR_UNARY_ASSUME:
 415                 print_string("__assume(");
 416                 print_assignment_expression(unexpr->value);
 417                 print_string(")");
 418                 return;
 419
 420         case EXPR_UNARY_THROW:
 421                 if (unexpr->value == NULL) {
 422                         print_string("throw");
 423                         return;
 424                 }
 425                 print_string("throw ");
 426                 break;
 427
 428         default:
 429                 panic("invalid unary expression found");
 430         }
 431         print_expression_prec(unexpr->value, prec);
 432 }
 433
 434 /**
 435  * Prints a reference expression.
 436  *
 437  * @param ref   the reference expression
 438  */
 439 static void print_reference_expression(const reference_expression_t *ref)
 440 {
 441         print_string(ref->entity->base.symbol->string);
 442 }
 443
 444 /**
 445  * Prints a label address expression.
 446  *
 447  * @param ref   the reference expression
 448  */
 449 static void print_label_address_expression(const label_address_expression_t *le)
 450 {
 451         print_format("&&%s", le->label->base.symbol->string);
 452 }
 453
 454 /**
 455  * Prints an array expression.
 456  *
 457  * @param expression   the array expression
 458  */
 459 static void print_array_expression(const array_access_expression_t *expression)
 460 {
 461         if (!expression->flipped) {
 462                 print_expression_prec(expression->array_ref, PREC_POSTFIX);
 463                 print_string("[");
 464                 print_expression(expression->index);
 465                 print_string("]");
 466         } else {
 467                 print_expression_prec(expression->index, PREC_POSTFIX);
 468                 print_string("[");
 469                 print_expression(expression->array_ref);
 470                 print_string("]");
 471         }
 472 }
 473
 474 /**
 475  * Prints a typeproperty expression (sizeof or __alignof__).
 476  *
 477  * @param expression   the type property expression
 478  */
 479 static void print_typeprop_expression(const typeprop_expression_t *expression)
 480 {
 481         if (expression->base.kind == EXPR_SIZEOF) {
 482                 print_string("sizeof");
 483         } else {
 484                 assert(expression->base.kind == EXPR_ALIGNOF);
 485                 print_string("__alignof__");
 486         }
 487         if (expression->tp_expression != NULL) {
 488                 /* PREC_TOP: always print the '()' here, sizeof x is right but unusual */
 489                 print_expression_prec(expression->tp_expression, PREC_TOP);
 490         } else {
 491                 print_string("(");
 492                 print_type(expression->type);
 493                 print_string(")");
 494         }
 495 }
 496
 497 /**
 498  * Prints a builtin constant expression.
 499  *
 500  * @param expression   the builtin constant expression
 501  */
 502 static void print_builtin_constant(const builtin_constant_expression_t *expression)
 503 {
 504         print_string("__builtin_constant_p(");
 505         print_assignment_expression(expression->value);
 506         print_string(")");
 507 }
 508
 509 /**
 510  * Prints a builtin types compatible expression.
 511  *
 512  * @param expression   the builtin types compatible expression
 513  */
 514 static void print_builtin_types_compatible(
 515                 const builtin_types_compatible_expression_t *expression)
 516 {
 517         print_string("__builtin_types_compatible_p(");
 518         print_type(expression->left);
 519         print_string(", ");
 520         print_type(expression->right);
 521         print_string(")");
 522 }
 523
 524 /**
 525  * Prints a conditional expression.
 526  *
 527  * @param expression   the conditional expression
 528  */
 529 static void print_conditional(const conditional_expression_t *expression)
 530 {
 531         print_expression_prec(expression->condition, PREC_LOGICAL_OR);
 532         if (expression->true_expression != NULL) {
 533                 print_string(" ? ");
 534                 print_expression_prec(expression->true_expression, PREC_EXPRESSION);
 535                 print_string(" : ");
 536         } else {
 537                 print_string(" ?: ");
 538         }
 539         precedence_t prec = c_mode & _CXX ? PREC_ASSIGNMENT : PREC_CONDITIONAL;
 540         print_expression_prec(expression->false_expression, prec);
 541 }
 542
 543 /**
 544  * Prints a va_start expression.
 545  *
 546  * @param expression   the va_start expression
 547  */
 548 static void print_va_start(const va_start_expression_t *const expression)
 549 {
 550         print_string("__builtin_va_start(");
 551         print_assignment_expression(expression->ap);
 552         print_string(", ");
 553         print_string(expression->parameter->base.base.symbol->string);
 554         print_string(")");
 555 }
 556
 557 /**
 558  * Prints a va_arg expression.
 559  *
 560  * @param expression   the va_arg expression
 561  */
 562 static void print_va_arg(const va_arg_expression_t *expression)
 563 {
 564         print_string("__builtin_va_arg(");
 565         print_assignment_expression(expression->ap);
 566         print_string(", ");
 567         print_type(expression->base.type);
 568         print_string(")");
 569 }
 570
 571 /**
 572  * Prints a va_copy expression.
 573  *
 574  * @param expression   the va_copy expression
 575  */
 576 static void print_va_copy(const va_copy_expression_t *expression)
 577 {
 578         print_string("__builtin_va_copy(");
 579         print_assignment_expression(expression->dst);
 580         print_string(", ");
 581         print_assignment_expression(expression->src);
 582         print_string(")");
 583 }
 584
 585 /**
 586  * Prints a select expression (. or ->).
 587  *
 588  * @param expression   the select expression
 589  */
 590 static void print_select(const select_expression_t *expression)
 591 {
 592         print_expression_prec(expression->compound, PREC_POSTFIX);
 593         if (is_type_pointer(skip_typeref(expression->compound->base.type))) {
 594                 print_string("->");
 595         } else {
 596                 print_string(".");
 597         }
 598         print_string(expression->compound_entry->base.symbol->string);
 599 }
 600
 601 /**
 602  * Prints a type classify expression.
 603  *
 604  * @param expr   the type classify expression
 605  */
 606 static void print_classify_type_expression(
 607         const classify_type_expression_t *const expr)
 608 {
 609         print_string("__builtin_classify_type(");
 610         print_assignment_expression(expr->type_expression);
 611         print_string(")");
 612 }
 613
 614 /**
 615  * Prints a designator.
 616  *
 617  * @param designator  the designator
 618  */
 619 static void print_designator(const designator_t *designator)
 620 {
 621         for ( ; designator != NULL; designator = designator->next) {
 622                 if (designator->symbol == NULL) {
 623                         print_string("[");
 624                         print_expression(designator->array_index);
 625                         print_string("]");
 626                 } else {
 627                         print_string(".");
 628                         print_string(designator->symbol->string);
 629                 }
 630         }
 631 }
 632
 633 /**
 634  * Prints an offsetof expression.
 635  *
 636  * @param expression   the offset expression
 637  */
 638 static void print_offsetof_expression(const offsetof_expression_t *expression)
 639 {
 640         print_string("__builtin_offsetof(");
 641         print_type(expression->type);
 642         print_string(",");
 643         print_designator(expression->designator);
 644         print_string(")");
 645 }
 646
 647 /**
 648  * Prints a statement expression.
 649  *
 650  * @param expression   the statement expression
 651  */
 652 static void print_statement_expression(const statement_expression_t *expression)
 653 {
 654         print_string("(");
 655         print_statement(expression->statement);
 656         print_string(")");
 657 }
 658
 659 /**
 660  * Prints an expression with parenthesis if needed.
 661  *
 662  * @param expression  the expression to print
 663  * @param top_prec    the precedence of the user of this expression.
 664  */
 665 static void print_expression_prec(const expression_t *expression, unsigned top_prec)
 666 {
 667         if (expression->kind == EXPR_UNARY_CAST
 668             && expression->base.implicit && !print_implicit_casts) {
 669                 expression = expression->unary.value;
 670         }
 671
 672         bool parenthesized =
 673                 expression->base.parenthesized                 ||
 674                 (print_parenthesis && top_prec != PREC_BOTTOM) ||
 675                 top_prec > get_expression_precedence(expression->base.kind);
 676
 677         if (parenthesized)
 678                 print_string("(");
 679         switch (expression->kind) {
 680         case EXPR_INVALID:
 681                 print_string("$invalid expression$");
 682                 break;
 683         case EXPR_WIDE_STRING_LITERAL:
 684         case EXPR_STRING_LITERAL:
 685                 print_string_literal(&expression->string_literal);
 686                 break;
 687         EXPR_LITERAL_CASES
 688                 print_literal(&expression->literal);
 689                 break;
 690         case EXPR_FUNCNAME:
 691                 print_funcname(&expression->funcname);
 692                 break;
 693         case EXPR_COMPOUND_LITERAL:
 694                 print_compound_literal(&expression->compound_literal);
 695                 break;
 696         case EXPR_CALL:
 697                 print_call_expression(&expression->call);
 698                 break;
 699         EXPR_BINARY_CASES
 700                 print_binary_expression(&expression->binary);
 701                 break;
 702         case EXPR_REFERENCE:
 703         case EXPR_REFERENCE_ENUM_VALUE:
 704                 print_reference_expression(&expression->reference);
 705                 break;
 706         case EXPR_ARRAY_ACCESS:
 707                 print_array_expression(&expression->array_access);
 708                 break;
 709         case EXPR_LABEL_ADDRESS:
 710                 print_label_address_expression(&expression->label_address);
 711                 break;
 712         EXPR_UNARY_CASES
 713                 print_unary_expression(&expression->unary);
 714                 break;
 715         case EXPR_SIZEOF:
 716         case EXPR_ALIGNOF:
 717                 print_typeprop_expression(&expression->typeprop);
 718                 break;
 719         case EXPR_BUILTIN_CONSTANT_P:
 720                 print_builtin_constant(&expression->builtin_constant);
 721                 break;
 722         case EXPR_BUILTIN_TYPES_COMPATIBLE_P:
 723                 print_builtin_types_compatible(&expression->builtin_types_compatible);
 724                 break;
 725         case EXPR_CONDITIONAL:
 726                 print_conditional(&expression->conditional);
 727                 break;
 728         case EXPR_VA_START:
 729                 print_va_start(&expression->va_starte);
 730                 break;
 731         case EXPR_VA_ARG:
 732                 print_va_arg(&expression->va_arge);
 733                 break;
 734         case EXPR_VA_COPY:
 735                 print_va_copy(&expression->va_copye);
 736                 break;
 737         case EXPR_SELECT:
 738                 print_select(&expression->select);
 739                 break;
 740         case EXPR_CLASSIFY_TYPE:
 741                 print_classify_type_expression(&expression->classify_type);
 742                 break;
 743         case EXPR_OFFSETOF:
 744                 print_offsetof_expression(&expression->offsetofe);
 745                 break;
 746         case EXPR_STATEMENT:
 747                 print_statement_expression(&expression->statement);
 748                 break;
 749
 750 #if 0
 751         default:
 752                 /* TODO */
 753                 print_format("some expression of type %d", (int)expression->kind);
 754                 break;
 755 #endif
 756         }
 757         if (parenthesized)
 758                 print_string(")");
 759 }
 760
 761 /**
 762  * Print an compound statement.
 763  *
 764  * @param block  the compound statement
 765  */
 766 static void print_compound_statement(const compound_statement_t *block)
 767 {
 768         print_string("{\n");
 769         ++indent;
 770
 771         statement_t *statement = block->statements;
 772         while (statement != NULL) {
 773                 if (statement->base.kind == STATEMENT_CASE_LABEL)
 774                         --indent;
 775                 if (statement->kind != STATEMENT_LABEL)
 776                         print_indent();
 777                 print_statement(statement);
 778
 779                 statement = statement->base.next;
 780         }
 781         --indent;
 782         print_indent();
 783         print_string(block->stmt_expr ? "}" : "}\n");
 784 }
 785
 786 /**
 787  * Print a return statement.
 788  *
 789  * @param statement  the return statement
 790  */
 791 static void print_return_statement(const return_statement_t *statement)
 792 {
 793         expression_t const *const val = statement->value;
 794         if (val != NULL) {
 795                 print_string("return ");
 796                 print_expression(val);
 797                 print_string(";\n");
 798         } else {
 799                 print_string("return;\n");
 800         }
 801 }
 802
 803 /**
 804  * Print an expression statement.
 805  *
 806  * @param statement  the expression statement
 807  */
 808 static void print_expression_statement(const expression_statement_t *statement)
 809 {
 810         print_expression(statement->expression);
 811         print_string(";\n");
 812 }
 813
 814 /**
 815  * Print a goto statement.
 816  *
 817  * @param statement  the goto statement
 818  */
 819 static void print_goto_statement(const goto_statement_t *statement)
 820 {
 821         print_string("goto ");
 822         if (statement->expression != NULL) {
 823                 print_string("*");
 824                 print_expression(statement->expression);
 825         } else {
 826                 print_string(statement->label->base.symbol->string);
 827         }
 828         print_string(";\n");
 829 }
 830
 831 /**
 832  * Print a label statement.
 833  *
 834  * @param statement  the label statement
 835  */
 836 static void print_label_statement(const label_statement_t *statement)
 837 {
 838         print_format("%s:\n", statement->label->base.symbol->string);
 839         print_indent();
 840         print_statement(statement->statement);
 841 }
 842
 843 /**
 844  * Print an if statement.
 845  *
 846  * @param statement  the if statement
 847  */
 848 static void print_if_statement(const if_statement_t *statement)
 849 {
 850         print_string("if (");
 851         print_expression(statement->condition);
 852         print_string(") ");
 853         print_statement(statement->true_statement);
 854
 855         if (statement->false_statement != NULL) {
 856                 print_indent();
 857                 print_string("else ");
 858                 print_statement(statement->false_statement);
 859         }
 860 }
 861
 862 /**
 863  * Print a switch statement.
 864  *
 865  * @param statement  the switch statement
 866  */
 867 static void print_switch_statement(const switch_statement_t *statement)
 868 {
 869         print_string("switch (");
 870         print_expression(statement->expression);
 871         print_string(") ");
 872         print_statement(statement->body);
 873 }
 874
 875 /**
 876  * Print a case label (including the default label).
 877  *
 878  * @param statement  the case label statement
 879  */
 880 static void print_case_label(const case_label_statement_t *statement)
 881 {
 882         if (statement->expression == NULL) {
 883                 print_string("default:\n");
 884         } else {
 885                 print_string("case ");
 886                 print_expression(statement->expression);
 887                 if (statement->end_range != NULL) {
 888                         print_string(" ... ");
 889                         print_expression(statement->end_range);
 890                 }
 891                 print_string(":\n");
 892         }
 893         ++indent;
 894         if (statement->statement != NULL) {
 895                 if (statement->statement->base.kind == STATEMENT_CASE_LABEL) {
 896                         --indent;
 897                 }
 898                 print_indent();
 899                 print_statement(statement->statement);
 900         }
 901 }
 902
 903 static void print_typedef(const entity_t *entity)
 904 {
 905         print_string("typedef ");
 906         print_type_ext(entity->typedefe.type, entity->base.symbol, NULL);
 907         print_string(";");
 908 }
 909
 910 /**
 911  * returns true if the entity is a compiler generated one and has no real
 912  * correspondenc in the source file
 913  */
 914 static bool is_generated_entity(const entity_t *entity)
 915 {
 916         if (entity->kind == ENTITY_TYPEDEF)
 917                 return entity->typedefe.builtin;
 918
 919         if (is_declaration(entity))
 920                 return entity->declaration.implicit;
 921
 922         return false;
 923 }
 924
 925 /**
 926  * Print a declaration statement.
 927  *
 928  * @param statement   the statement
 929  */
 930 static void print_declaration_statement(
 931                 const declaration_statement_t *statement)
 932 {
 933         bool first = true;
 934         entity_t *entity = statement->declarations_begin;
 935         if (entity == NULL) {
 936                 print_string("/* empty declaration statement */\n");
 937                 return;
 938         }
 939
 940         entity_t *const end = statement->declarations_end->base.next;
 941         for (; entity != end; entity = entity->base.next) {
 942                 if (entity->kind == ENTITY_ENUM_VALUE)
 943                         continue;
 944                 if (is_generated_entity(entity))
 945                         continue;
 946
 947                 if (!first) {
 948                         print_indent();
 949                 } else {
 950                         first = false;
 951                 }
 952
 953                 print_entity(entity);
 954                 print_string("\n");
 955         }
 956 }
 957
 958 /**
 959  * Print a while statement.
 960  *
 961  * @param statement   the statement
 962  */
 963 static void print_while_statement(const while_statement_t *statement)
 964 {
 965         print_string("while (");
 966         print_expression(statement->condition);
 967         print_string(") ");
 968         print_statement(statement->body);
 969 }
 970
 971 /**
 972  * Print a do-while statement.
 973  *
 974  * @param statement   the statement
 975  */
 976 static void print_do_while_statement(const do_while_statement_t *statement)
 977 {
 978         print_string("do ");
 979         print_statement(statement->body);
 980         print_indent();
 981         print_string("while (");
 982         print_expression(statement->condition);
 983         print_string(");\n");
 984 }
 985
 986 /**
 987  * Print a for statement.
 988  *
 989  * @param statement   the statement
 990  */
 991 static void print_for_statement(const for_statement_t *statement)
 992 {
 993         print_string("for (");
 994         if (statement->initialisation != NULL) {
 995                 print_expression(statement->initialisation);
 996                 print_string(";");
 997         } else {
 998                 entity_t const *entity = statement->scope.entities;
 999                 for (; entity != NULL; entity = entity->base.next) {
1000                         if (is_generated_entity(entity))
1001                                 continue;
1002                         /* FIXME display of multiple declarations is wrong */
1003                         print_declaration(entity);
1004                 }
1005         }
1006         if (statement->condition != NULL) {
1007                 print_string(" ");
1008                 print_expression(statement->condition);
1009         }
1010         print_string(";");
1011         if (statement->step != NULL) {
1012                 print_string(" ");
1013                 print_expression(statement->step);
1014         }
1015         print_string(") ");
1016         print_statement(statement->body);
1017 }
1018
1019 /**
1020  * Print assembler arguments.
1021  *
1022  * @param arguments   the arguments
1023  */
1024 static void print_asm_arguments(asm_argument_t *arguments)
1025 {
1026         asm_argument_t *argument = arguments;
1027         for (; argument != NULL; argument = argument->next) {
1028                 if (argument != arguments)
1029                         print_string(", ");
1030
1031                 if (argument->symbol) {
1032                         print_format("[%s] ", argument->symbol->string);
1033                 }
1034                 print_quoted_string(&argument->constraints, '"', 1);
1035                 print_string(" (");
1036                 print_expression(argument->expression);
1037                 print_string(")");
1038         }
1039 }
1040
1041 /**
1042  * Print assembler clobbers.
1043  *
1044  * @param clobbers   the clobbers
1045  */
1046 static void print_asm_clobbers(asm_clobber_t *clobbers)
1047 {
1048         asm_clobber_t *clobber = clobbers;
1049         for (; clobber != NULL; clobber = clobber->next) {
1050                 if (clobber != clobbers)
1051                         print_string(", ");
1052
1053                 print_quoted_string(&clobber->clobber, '"', 1);
1054         }
1055 }
1056
1057 /**
1058  * Print an assembler statement.
1059  *
1060  * @param statement   the statement
1061  */
1062 static void print_asm_statement(const asm_statement_t *statement)
1063 {
1064         print_string("asm ");
1065         if (statement->is_volatile) {
1066                 print_string("volatile ");
1067         }
1068         print_string("(");
1069         print_quoted_string(&statement->asm_text, '"', 1);
1070         if (statement->outputs  == NULL &&
1071             statement->inputs   == NULL &&
1072             statement->clobbers == NULL)
1073                 goto end_of_print_asm_statement;
1074
1075         print_string(" : ");
1076         print_asm_arguments(statement->outputs);
1077         if (statement->inputs == NULL && statement->clobbers == NULL)
1078                 goto end_of_print_asm_statement;
1079
1080         print_string(" : ");
1081         print_asm_arguments(statement->inputs);
1082         if (statement->clobbers == NULL)
1083                 goto end_of_print_asm_statement;
1084
1085         print_string(" : ");
1086         print_asm_clobbers(statement->clobbers);
1087
1088 end_of_print_asm_statement:
1089         print_string(");\n");
1090 }
1091
1092 /**
1093  * Print a microsoft __try statement.
1094  *
1095  * @param statement   the statement
1096  */
1097 static void print_ms_try_statement(const ms_try_statement_t *statement)
1098 {
1099         print_string("__try ");
1100         print_statement(statement->try_statement);
1101         print_indent();
1102         if (statement->except_expression != NULL) {
1103                 print_string("__except(");
1104                 print_expression(statement->except_expression);
1105                 print_string(") ");
1106         } else {
1107                 print_string("__finally ");
1108         }
1109         print_statement(statement->final_statement);
1110 }
1111
1112 /**
1113  * Print a microsoft __leave statement.
1114  *
1115  * @param statement   the statement
1116  */
1117 static void print_leave_statement(const leave_statement_t *statement)
1118 {
1119         (void)statement;
1120         print_string("__leave;\n");
1121 }
1122
1123 /**
1124  * Print a statement.
1125  *
1126  * @param statement   the statement
1127  */
1128 void print_statement(const statement_t *statement)
1129 {
1130         switch (statement->kind) {
1131         case STATEMENT_EMPTY:
1132                 print_string(";\n");
1133                 break;
1134         case STATEMENT_COMPOUND:
1135                 print_compound_statement(&statement->compound);
1136                 break;
1137         case STATEMENT_RETURN:
1138                 print_return_statement(&statement->returns);
1139                 break;
1140         case STATEMENT_EXPRESSION:
1141                 print_expression_statement(&statement->expression);
1142                 break;
1143         case STATEMENT_LABEL:
1144                 print_label_statement(&statement->label);
1145                 break;
1146         case STATEMENT_GOTO:
1147                 print_goto_statement(&statement->gotos);
1148                 break;
1149         case STATEMENT_CONTINUE:
1150                 print_string("continue;\n");
1151                 break;
1152         case STATEMENT_BREAK:
1153                 print_string("break;\n");
1154                 break;
1155         case STATEMENT_IF:
1156                 print_if_statement(&statement->ifs);
1157                 break;
1158         case STATEMENT_SWITCH:
1159                 print_switch_statement(&statement->switchs);
1160                 break;
1161         case STATEMENT_CASE_LABEL:
1162                 print_case_label(&statement->case_label);
1163                 break;
1164         case STATEMENT_DECLARATION:
1165                 print_declaration_statement(&statement->declaration);
1166                 break;
1167         case STATEMENT_WHILE:
1168                 print_while_statement(&statement->whiles);
1169                 break;
1170         case STATEMENT_DO_WHILE:
1171                 print_do_while_statement(&statement->do_while);
1172                 break;
1173         case STATEMENT_FOR:
1174                 print_for_statement(&statement->fors);
1175                 break;
1176         case STATEMENT_ASM:
1177                 print_asm_statement(&statement->asms);
1178                 break;
1179         case STATEMENT_MS_TRY:
1180                 print_ms_try_statement(&statement->ms_try);
1181                 break;
1182         case STATEMENT_LEAVE:
1183                 print_leave_statement(&statement->leave);
1184                 break;
1185         case STATEMENT_INVALID:
1186                 print_string("$invalid statement$\n");
1187                 break;
1188         }
1189 }
1190
1191 /**
1192  * Print a storage class.
1193  *
1194  * @param storage_class   the storage class
1195  */
1196 static void print_storage_class(storage_class_tag_t storage_class)
1197 {
1198         switch (storage_class) {
1199         case STORAGE_CLASS_NONE:     return;
1200         case STORAGE_CLASS_TYPEDEF:  print_string("typedef ");  return;
1201         case STORAGE_CLASS_EXTERN:   print_string("extern ");   return;
1202         case STORAGE_CLASS_STATIC:   print_string("static ");   return;
1203         case STORAGE_CLASS_AUTO:     print_string("auto ");     return;
1204         case STORAGE_CLASS_REGISTER: print_string("register "); return;
1205         }
1206         panic("invalid storage class");
1207 }
1208
1209 /**
1210  * Print an initializer.
1211  *
1212  * @param initializer  the initializer
1213  */
1214 void print_initializer(const initializer_t *initializer)
1215 {
1216         if (initializer == NULL) {
1217                 print_string("{}");
1218                 return;
1219         }
1220
1221         switch (initializer->kind) {
1222         case INITIALIZER_VALUE: {
1223                 const initializer_value_t *value = &initializer->value;
1224                 print_assignment_expression(value->value);
1225                 return;
1226         }
1227         case INITIALIZER_LIST: {
1228                 assert(initializer->kind == INITIALIZER_LIST);
1229                 print_string("{ ");
1230                 const initializer_list_t *list = &initializer->list;
1231
1232                 for (size_t i = 0 ; i < list->len; ++i) {
1233                         const initializer_t *sub_init = list->initializers[i];
1234                         print_initializer(list->initializers[i]);
1235                         if (i < list->len-1) {
1236                                 if (sub_init == NULL || sub_init->kind != INITIALIZER_DESIGNATOR)
1237                                         print_string(", ");
1238                         }
1239                 }
1240                 print_string(" }");
1241                 return;
1242         }
1243         case INITIALIZER_STRING:
1244                 print_quoted_string(&initializer->string.string, '"', 1);
1245                 return;
1246         case INITIALIZER_WIDE_STRING:
1247                 print_quoted_string(&initializer->string.string, '"', 1);
1248                 return;
1249         case INITIALIZER_DESIGNATOR:
1250                 print_designator(initializer->designator.designator);
1251                 print_string(" = ");
1252                 return;
1253         }
1254
1255         panic("invalid initializer kind found");
1256 }
1257
1258 #if 0
1259 /**
1260  * Print microsoft extended declaration modifiers.
1261  */
1262 static void print_ms_modifiers(const declaration_t *declaration)
1263 {
1264         if ((c_mode & _MS) == 0)
1265                 return;
1266
1267         decl_modifiers_t modifiers = declaration->modifiers;
1268
1269         bool        ds_shown = false;
1270         const char *next     = "(";
1271
1272         if (declaration->base.kind == ENTITY_VARIABLE) {
1273                 variable_t *variable = (variable_t*)declaration;
1274                 if (variable->alignment != 0
1275                                 || variable->get_property_sym != NULL
1276                                 || variable->put_property_sym != NULL) {
1277                         if (!ds_shown) {
1278                                 print_string("__declspec");
1279                                 ds_shown = true;
1280                         }
1281
1282                         if (variable->alignment != 0) {
1283                                 print_string(next); next = ", "; print_format("align(%u)", variable->alignment);
1284                         }
1285                         if (variable->get_property_sym != NULL
1286                                         || variable->put_property_sym != NULL) {
1287                                 char *comma = "";
1288                                 print_string(next); next = ", "; print_string("property(");
1289                                 if (variable->get_property_sym != NULL) {
1290                                         print_format("get=%s", variable->get_property_sym->string);
1291                                         comma = ", ";
1292                                 }
1293                                 if (variable->put_property_sym != NULL)
1294                                         print_format("%sput=%s", comma, variable->put_property_sym->string);
1295                                 print_string(")");
1296                         }
1297                 }
1298         }
1299
1300         /* DM_FORCEINLINE handled outside. */
1301         if ((modifiers & ~DM_FORCEINLINE) != 0) {
1302                 if (!ds_shown) {
1303                         print_string("__declspec");
1304                         ds_shown = true;
1305                 }
1306                 if (modifiers & DM_DLLIMPORT) {
1307                         print_string(next); next = ", "; print_string("dllimport");
1308                 }
1309                 if (modifiers & DM_DLLEXPORT) {
1310                         print_string(next); next = ", "; print_string("dllexport");
1311                 }
1312                 if (modifiers & DM_THREAD) {
1313                         print_string(next); next = ", "; print_string("thread");
1314                 }
1315                 if (modifiers & DM_NAKED) {
1316                         print_string(next); next = ", "; print_string("naked");
1317                 }
1318                 if (modifiers & DM_THREAD) {
1319                         print_string(next); next = ", "; print_string("thread");
1320                 }
1321                 if (modifiers & DM_SELECTANY) {
1322                         print_string(next); next = ", "; print_string("selectany");
1323                 }
1324                 if (modifiers & DM_NOTHROW) {
1325                         print_string(next); next = ", "; print_string("nothrow");
1326                 }
1327                 if (modifiers & DM_NORETURN) {
1328                         print_string(next); next = ", "; print_string("noreturn");
1329                 }
1330                 if (modifiers & DM_NOINLINE) {
1331                         print_string(next); next = ", "; print_string("noinline");
1332                 }
1333                 if (modifiers & DM_DEPRECATED) {
1334                         print_string(next); next = ", "; print_string("deprecated");
1335                         if (declaration->deprecated_string != NULL)
1336                                 print_format("(\"%s\")",
1337                                         declaration->deprecated_string);
1338                 }
1339                 if (modifiers & DM_RESTRICT) {
1340                         print_string(next); next = ", "; print_string("restrict");
1341                 }
1342                 if (modifiers & DM_NOALIAS) {
1343                         print_string(next); next = ", "; print_string("noalias");
1344                 }
1345         }
1346
1347         if (ds_shown)
1348                 print_string(") ");
1349 }
1350 #endif
1351
1352 static void print_scope(const scope_t *scope)
1353 {
1354         const entity_t *entity = scope->entities;
1355         for ( ; entity != NULL; entity = entity->base.next) {
1356                 print_indent();
1357                 print_entity(entity);
1358                 print_string("\n");
1359         }
1360 }
1361
1362 static void print_namespace(const namespace_t *namespace)
1363 {
1364         print_string("namespace ");
1365         if (namespace->base.symbol != NULL) {
1366                 print_string(namespace->base.symbol->string);
1367                 print_string(" ");
1368         }
1369
1370         print_string("{\n");
1371         ++indent;
1372
1373         print_scope(&namespace->members);
1374
1375         --indent;
1376         print_indent();
1377         print_string("}\n");
1378 }
1379
1380 /**
1381  * Print a variable or function declaration
1382  */
1383 void print_declaration(const entity_t *entity)
1384 {
1385         assert(is_declaration(entity));
1386         const declaration_t *declaration = &entity->declaration;
1387
1388         print_storage_class((storage_class_tag_t)declaration->declared_storage_class);
1389         if (entity->kind == ENTITY_FUNCTION) {
1390                 function_t *function = (function_t*)declaration;
1391                 if (function->is_inline) {
1392                         if (declaration->modifiers & DM_FORCEINLINE) {
1393                                 print_string("__forceinline ");
1394                         } else if (declaration->modifiers & DM_MICROSOFT_INLINE) {
1395                                 print_string("__inline ");
1396                         } else {
1397                                 print_string("inline ");
1398                         }
1399                 }
1400         }
1401         //print_ms_modifiers(declaration);
1402         switch (entity->kind) {
1403                 case ENTITY_FUNCTION:
1404                         print_type_ext(entity->declaration.type, entity->base.symbol,
1405                                         &entity->function.parameters);
1406
1407                         if (entity->function.statement != NULL) {
1408                                 print_string("\n");
1409                                 print_indent();
1410                                 print_statement(entity->function.statement);
1411                                 return;
1412                         }
1413                         break;
1414
1415                 case ENTITY_VARIABLE:
1416                         if (entity->variable.thread_local)
1417                                 print_string("__thread ");
1418                         print_type_ext(declaration->type, declaration->base.symbol, NULL);
1419                         if (entity->variable.initializer != NULL) {
1420                                 print_string(" = ");
1421                                 print_initializer(entity->variable.initializer);
1422                         }
1423                         break;
1424
1425                 case ENTITY_COMPOUND_MEMBER:
1426                         print_type_ext(declaration->type, declaration->base.symbol, NULL);
1427                         if (entity->compound_member.bitfield) {
1428                                 print_format(" : %u", entity->compound_member.bit_size);
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_type_size(type_void_ptr)
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         panic("invalid expression found (is constant expression)");
1973 }
1974
1975 void init_ast(void)
1976 {
1977         obstack_init(&ast_obstack);
1978 }
1979
1980 void exit_ast(void)
1981 {
1982         obstack_free(&ast_obstack, NULL);
1983 }