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 "separator_t.h"
  30 #include "types.h"
  31
  32 #include <assert.h>
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35 #include <ctype.h>
  36
  37 #if defined(__INTEL_COMPILER)
  38 #include <mathimf.h>
  39 #elif defined(__CYGWIN__)
  40 #include "win32/cygwin_math_ext.h"
  41 #else
  42 #include <math.h>
  43 #endif
  44
  45 #include "adt/error.h"
  46 #include "adt/util.h"
  47
  48 struct obstack ast_obstack;
  49
  50 static int indent;
  51 static int case_indent;
  52
  53 bool print_implicit_casts = false;
  54 bool print_parenthesis = false;
  55
  56 static void print_statement(const statement_t *statement);
  57 static void print_expression_prec(const expression_t *expression, unsigned prec);
  58
  59 void change_indent(int delta)
  60 {
  61         indent += delta;
  62         assert(indent >= 0);
  63 }
  64
  65 void print_indent(void)
  66 {
  67         for (int i = 0; i < indent; ++i)
  68                 print_char('\t');
  69 }
  70
  71 /**
  72  * Returns 1 if a given precedence level has right-to-left
  73  * associativity, else 0.
  74  *
  75  * @param precedence   the operator precedence
  76  */
  77 static int right_to_left(unsigned precedence)
  78 {
  79         switch (precedence) {
  80         case PREC_ASSIGNMENT:
  81         case PREC_CONDITIONAL:
  82         case PREC_UNARY:
  83                 return 1;
  84
  85         default:
  86                 return 0;
  87         }
  88 }
  89
  90 /**
  91  * Return the precedence of an expression given by its kind.
  92  *
  93  * @param kind   the expression kind
  94  */
  95 static unsigned get_expression_precedence(expression_kind_t kind)
  96 {
  97         static const unsigned prec[] = {
  98                 [EXPR_ERROR]                      = PREC_PRIMARY,
  99                 [EXPR_REFERENCE]                  = PREC_PRIMARY,
 100                 [EXPR_ENUM_CONSTANT]              = PREC_PRIMARY,
 101                 [EXPR_LITERAL_INTEGER]            = PREC_PRIMARY,
 102                 [EXPR_LITERAL_FLOATINGPOINT]      = PREC_PRIMARY,
 103                 [EXPR_LITERAL_CHARACTER]          = PREC_PRIMARY,
 104                 [EXPR_LITERAL_MS_NOOP]            = PREC_PRIMARY,
 105                 [EXPR_STRING_LITERAL]             = PREC_PRIMARY,
 106                 [EXPR_COMPOUND_LITERAL]           = PREC_UNARY,
 107                 [EXPR_CALL]                       = PREC_POSTFIX,
 108                 [EXPR_CONDITIONAL]                = PREC_CONDITIONAL,
 109                 [EXPR_SELECT]                     = PREC_POSTFIX,
 110                 [EXPR_ARRAY_ACCESS]               = PREC_POSTFIX,
 111                 [EXPR_SIZEOF]                     = PREC_UNARY,
 112                 [EXPR_CLASSIFY_TYPE]              = PREC_UNARY,
 113                 [EXPR_ALIGNOF]                    = PREC_UNARY,
 114
 115                 [EXPR_FUNCNAME]                   = PREC_PRIMARY,
 116                 [EXPR_BUILTIN_CONSTANT_P]         = PREC_PRIMARY,
 117                 [EXPR_BUILTIN_TYPES_COMPATIBLE_P] = PREC_PRIMARY,
 118                 [EXPR_OFFSETOF]                   = PREC_PRIMARY,
 119                 [EXPR_VA_START]                   = PREC_PRIMARY,
 120                 [EXPR_VA_ARG]                     = PREC_PRIMARY,
 121                 [EXPR_VA_COPY]                    = PREC_PRIMARY,
 122                 [EXPR_STATEMENT]                  = PREC_PRIMARY,
 123                 [EXPR_LABEL_ADDRESS]              = PREC_PRIMARY,
 124
 125                 [EXPR_UNARY_NEGATE]               = PREC_UNARY,
 126                 [EXPR_UNARY_PLUS]                 = PREC_UNARY,
 127                 [EXPR_UNARY_COMPLEMENT]           = PREC_UNARY,
 128                 [EXPR_UNARY_NOT]                  = PREC_UNARY,
 129                 [EXPR_UNARY_DEREFERENCE]          = PREC_UNARY,
 130                 [EXPR_UNARY_TAKE_ADDRESS]         = PREC_UNARY,
 131                 [EXPR_UNARY_POSTFIX_INCREMENT]    = PREC_POSTFIX,
 132                 [EXPR_UNARY_POSTFIX_DECREMENT]    = PREC_POSTFIX,
 133                 [EXPR_UNARY_PREFIX_INCREMENT]     = PREC_UNARY,
 134                 [EXPR_UNARY_PREFIX_DECREMENT]     = PREC_UNARY,
 135                 [EXPR_UNARY_CAST]                 = PREC_UNARY,
 136                 [EXPR_UNARY_ASSUME]               = PREC_PRIMARY,
 137                 [EXPR_UNARY_DELETE]               = PREC_UNARY,
 138                 [EXPR_UNARY_DELETE_ARRAY]         = PREC_UNARY,
 139                 [EXPR_UNARY_THROW]                = PREC_ASSIGNMENT,
 140                 [EXPR_UNARY_IMAG]                 = PREC_UNARY,
 141                 [EXPR_UNARY_REAL]                 = PREC_UNARY,
 142
 143                 [EXPR_BINARY_ADD]                 = PREC_ADDITIVE,
 144                 [EXPR_BINARY_SUB]                 = PREC_ADDITIVE,
 145                 [EXPR_BINARY_MUL]                 = PREC_MULTIPLICATIVE,
 146                 [EXPR_BINARY_DIV]                 = PREC_MULTIPLICATIVE,
 147                 [EXPR_BINARY_MOD]                 = PREC_MULTIPLICATIVE,
 148                 [EXPR_BINARY_EQUAL]               = PREC_EQUALITY,
 149                 [EXPR_BINARY_NOTEQUAL]            = PREC_EQUALITY,
 150                 [EXPR_BINARY_LESS]                = PREC_RELATIONAL,
 151                 [EXPR_BINARY_LESSEQUAL]           = PREC_RELATIONAL,
 152                 [EXPR_BINARY_GREATER]             = PREC_RELATIONAL,
 153                 [EXPR_BINARY_GREATEREQUAL]        = PREC_RELATIONAL,
 154                 [EXPR_BINARY_BITWISE_AND]         = PREC_AND,
 155                 [EXPR_BINARY_BITWISE_OR]          = PREC_OR,
 156                 [EXPR_BINARY_BITWISE_XOR]         = PREC_XOR,
 157                 [EXPR_BINARY_LOGICAL_AND]         = PREC_LOGICAL_AND,
 158                 [EXPR_BINARY_LOGICAL_OR]          = PREC_LOGICAL_OR,
 159                 [EXPR_BINARY_SHIFTLEFT]           = PREC_SHIFT,
 160                 [EXPR_BINARY_SHIFTRIGHT]          = PREC_SHIFT,
 161                 [EXPR_BINARY_ASSIGN]              = PREC_ASSIGNMENT,
 162                 [EXPR_BINARY_MUL_ASSIGN]          = PREC_ASSIGNMENT,
 163                 [EXPR_BINARY_DIV_ASSIGN]          = PREC_ASSIGNMENT,
 164                 [EXPR_BINARY_MOD_ASSIGN]          = PREC_ASSIGNMENT,
 165                 [EXPR_BINARY_ADD_ASSIGN]          = PREC_ASSIGNMENT,
 166                 [EXPR_BINARY_SUB_ASSIGN]          = PREC_ASSIGNMENT,
 167                 [EXPR_BINARY_SHIFTLEFT_ASSIGN]    = PREC_ASSIGNMENT,
 168                 [EXPR_BINARY_SHIFTRIGHT_ASSIGN]   = PREC_ASSIGNMENT,
 169                 [EXPR_BINARY_BITWISE_AND_ASSIGN]  = PREC_ASSIGNMENT,
 170                 [EXPR_BINARY_BITWISE_XOR_ASSIGN]  = PREC_ASSIGNMENT,
 171                 [EXPR_BINARY_BITWISE_OR_ASSIGN]   = PREC_ASSIGNMENT,
 172                 [EXPR_BINARY_COMMA]               = PREC_EXPRESSION,
 173
 174                 [EXPR_BINARY_ISGREATER]           = PREC_PRIMARY,
 175                 [EXPR_BINARY_ISGREATEREQUAL]      = PREC_PRIMARY,
 176                 [EXPR_BINARY_ISLESS]              = PREC_PRIMARY,
 177                 [EXPR_BINARY_ISLESSEQUAL]         = PREC_PRIMARY,
 178                 [EXPR_BINARY_ISLESSGREATER]       = PREC_PRIMARY,
 179                 [EXPR_BINARY_ISUNORDERED]         = PREC_PRIMARY
 180         };
 181         assert((size_t)kind < lengthof(prec));
 182         unsigned res = prec[kind];
 183
 184         assert(res != PREC_BOTTOM);
 185         return res;
 186 }
 187
 188 /**
 189  * Print a quoted string constant.
 190  *
 191  * @param string  the string constant
 192  * @param border  the border char
 193  */
 194 static void print_quoted_string(const string_t *const string, char border)
 195 {
 196         print_string(get_string_encoding_prefix(string->encoding));
 197
 198         print_char(border);
 199         const char *end = string->begin + string->size;
 200         for (const char *c = string->begin; c != end; ++c) {
 201                 const char tc = *c;
 202                 if (tc == border) {
 203                         print_char('\\');
 204                 }
 205                 switch (tc) {
 206                 case '\\': print_string("\\\\"); break;
 207                 case '\a': print_string("\\a"); break;
 208                 case '\b': print_string("\\b"); break;
 209                 case '\f': print_string("\\f"); break;
 210                 case '\n': print_string("\\n"); break;
 211                 case '\r': print_string("\\r"); break;
 212                 case '\t': print_string("\\t"); break;
 213                 case '\v': print_string("\\v"); break;
 214                 case '\?': print_string("\\?"); break;
 215                 case 27:
 216                         if (c_mode & _GNUC) {
 217                                 print_string("\\e"); break;
 218                         }
 219                         /* FALLTHROUGH */
 220                 default:
 221                         if ((unsigned)tc < 0x80 && !isprint(tc)) {
 222                                 print_format("\\%03o", (unsigned)tc);
 223                         } else {
 224                                 print_char(tc);
 225                         }
 226                         break;
 227                 }
 228         }
 229         print_char(border);
 230 }
 231
 232 static void print_string_literal(string_literal_expression_t const *const literal, char const delimiter)
 233 {
 234         print_quoted_string(&literal->value, delimiter);
 235 }
 236
 237 static void print_literal(const literal_expression_t *literal)
 238 {
 239         switch (literal->base.kind) {
 240         case EXPR_LITERAL_MS_NOOP:
 241                 print_string("__noop");
 242                 return;
 243
 244         case EXPR_LITERAL_BOOLEAN:
 245         case EXPR_LITERAL_FLOATINGPOINT:
 246         case EXPR_LITERAL_INTEGER:
 247                 print_string(literal->value.begin);
 248                 return;
 249
 250         default:
 251                 break;
 252         }
 253         print_string("INVALID LITERAL KIND");
 254 }
 255
 256 /**
 257  * Prints a predefined symbol.
 258  */
 259 static void print_funcname(const funcname_expression_t *funcname)
 260 {
 261         const char *s = "";
 262         switch (funcname->kind) {
 263         case FUNCNAME_FUNCTION:        s = (c_mode & _C99) ? "__func__" : "__FUNCTION__"; break;
 264         case FUNCNAME_PRETTY_FUNCTION: s = "__PRETTY_FUNCTION__"; break;
 265         case FUNCNAME_FUNCSIG:         s = "__FUNCSIG__"; break;
 266         case FUNCNAME_FUNCDNAME:       s = "__FUNCDNAME__"; break;
 267         }
 268         print_string(s);
 269 }
 270
 271 static void print_compound_literal(
 272                 const compound_literal_expression_t *expression)
 273 {
 274         print_char('(');
 275         print_type(expression->type);
 276         print_char(')');
 277         print_initializer(expression->initializer);
 278 }
 279
 280 static void print_assignment_expression(const expression_t *const expr)
 281 {
 282         print_expression_prec(expr, PREC_ASSIGNMENT);
 283 }
 284
 285 /**
 286  * Prints a call expression.
 287  *
 288  * @param call  the call expression
 289  */
 290 static void print_call_expression(const call_expression_t *call)
 291 {
 292         print_expression_prec(call->function, PREC_POSTFIX);
 293         print_char('(');
 294         separator_t sep = { "", ", " };
 295         for (call_argument_t const *arg = call->arguments; arg; arg = arg->next) {
 296                 print_string(sep_next(&sep));
 297                 print_assignment_expression(arg->expression);
 298         }
 299         print_char(')');
 300 }
 301
 302 /**
 303  * Prints a binary expression.
 304  *
 305  * @param binexpr   the binary expression
 306  */
 307 static void print_binary_expression(const binary_expression_t *binexpr)
 308 {
 309         unsigned prec = get_expression_precedence(binexpr->base.kind);
 310         int      r2l  = right_to_left(prec);
 311
 312         print_expression_prec(binexpr->left, prec + r2l);
 313         char const* op;
 314         switch (binexpr->base.kind) {
 315         case EXPR_BINARY_COMMA:              op = ", ";    break;
 316         case EXPR_BINARY_ASSIGN:             op = " = ";   break;
 317         case EXPR_BINARY_ADD:                op = " + ";   break;
 318         case EXPR_BINARY_SUB:                op = " - ";   break;
 319         case EXPR_BINARY_MUL:                op = " * ";   break;
 320         case EXPR_BINARY_MOD:                op = " % ";   break;
 321         case EXPR_BINARY_DIV:                op = " / ";   break;
 322         case EXPR_BINARY_BITWISE_OR:         op = " | ";   break;
 323         case EXPR_BINARY_BITWISE_AND:        op = " & ";   break;
 324         case EXPR_BINARY_BITWISE_XOR:        op = " ^ ";   break;
 325         case EXPR_BINARY_LOGICAL_OR:         op = " || ";  break;
 326         case EXPR_BINARY_LOGICAL_AND:        op = " && ";  break;
 327         case EXPR_BINARY_NOTEQUAL:           op = " != ";  break;
 328         case EXPR_BINARY_EQUAL:              op = " == ";  break;
 329         case EXPR_BINARY_LESS:               op = " < ";   break;
 330         case EXPR_BINARY_LESSEQUAL:          op = " <= ";  break;
 331         case EXPR_BINARY_GREATER:            op = " > ";   break;
 332         case EXPR_BINARY_GREATEREQUAL:       op = " >= ";  break;
 333         case EXPR_BINARY_SHIFTLEFT:          op = " << ";  break;
 334         case EXPR_BINARY_SHIFTRIGHT:         op = " >> ";  break;
 335
 336         case EXPR_BINARY_ADD_ASSIGN:         op = " += ";  break;
 337         case EXPR_BINARY_SUB_ASSIGN:         op = " -= ";  break;
 338         case EXPR_BINARY_MUL_ASSIGN:         op = " *= ";  break;
 339         case EXPR_BINARY_MOD_ASSIGN:         op = " %= ";  break;
 340         case EXPR_BINARY_DIV_ASSIGN:         op = " /= ";  break;
 341         case EXPR_BINARY_BITWISE_OR_ASSIGN:  op = " |= ";  break;
 342         case EXPR_BINARY_BITWISE_AND_ASSIGN: op = " &= ";  break;
 343         case EXPR_BINARY_BITWISE_XOR_ASSIGN: op = " ^= ";  break;
 344         case EXPR_BINARY_SHIFTLEFT_ASSIGN:   op = " <<= "; break;
 345         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:  op = " >>= "; break;
 346         default: panic("invalid binexpression found");
 347         }
 348         print_string(op);
 349         print_expression_prec(binexpr->right, prec + 1 - r2l);
 350 }
 351
 352 /**
 353  * Prints an unary expression.
 354  *
 355  * @param unexpr   the unary expression
 356  */
 357 static void print_unary_expression(const unary_expression_t *unexpr)
 358 {
 359         unsigned prec = get_expression_precedence(unexpr->base.kind);
 360         switch (unexpr->base.kind) {
 361         case EXPR_UNARY_NEGATE:           print_char  ('-' );         break;
 362         case EXPR_UNARY_PLUS:             print_char  ('+' );         break;
 363         case EXPR_UNARY_NOT:              print_char  ('!' );         break;
 364         case EXPR_UNARY_COMPLEMENT:       print_char  ('~' );         break;
 365         case EXPR_UNARY_PREFIX_INCREMENT: print_string("++");         break;
 366         case EXPR_UNARY_PREFIX_DECREMENT: print_string("--");         break;
 367         case EXPR_UNARY_DEREFERENCE:      print_char  ('*' );         break;
 368         case EXPR_UNARY_TAKE_ADDRESS:     print_char  ('&' );         break;
 369         case EXPR_UNARY_DELETE:           print_string("delete ");    break;
 370         case EXPR_UNARY_DELETE_ARRAY:     print_string("delete [] "); break;
 371         case EXPR_UNARY_REAL:             print_string("__real__ ");  break;
 372         case EXPR_UNARY_IMAG:             print_string("__imag__ ");  break;
 373
 374         case EXPR_UNARY_POSTFIX_INCREMENT:
 375                 print_expression_prec(unexpr->value, prec);
 376                 print_string("++");
 377                 return;
 378         case EXPR_UNARY_POSTFIX_DECREMENT:
 379                 print_expression_prec(unexpr->value, prec);
 380                 print_string("--");
 381                 return;
 382         case EXPR_UNARY_CAST:
 383                 print_char('(');
 384                 print_type(unexpr->base.type);
 385                 print_char(')');
 386                 break;
 387         case EXPR_UNARY_ASSUME:
 388                 print_string("__assume(");
 389                 print_assignment_expression(unexpr->value);
 390                 print_char(')');
 391                 return;
 392         case EXPR_UNARY_THROW:
 393                 if (unexpr->value == NULL) {
 394                         print_string("throw");
 395                         return;
 396                 }
 397                 print_string("throw ");
 398                 break;
 399
 400         default:
 401                 panic("invalid unary expression found");
 402         }
 403         print_expression_prec(unexpr->value, prec);
 404 }
 405
 406 /**
 407  * Prints a reference expression.
 408  *
 409  * @param ref   the reference expression
 410  */
 411 static void print_reference_expression(const reference_expression_t *ref)
 412 {
 413         print_string(ref->entity->base.symbol->string);
 414 }
 415
 416 /**
 417  * Prints a label address expression.
 418  *
 419  * @param ref   the reference expression
 420  */
 421 static void print_label_address_expression(const label_address_expression_t *le)
 422 {
 423         print_format("&&%s", le->label->base.symbol->string);
 424 }
 425
 426 /**
 427  * Prints an array expression.
 428  *
 429  * @param expression   the array expression
 430  */
 431 static void print_array_expression(const array_access_expression_t *expression)
 432 {
 433         if (!expression->flipped) {
 434                 print_expression_prec(expression->array_ref, PREC_POSTFIX);
 435                 print_char('[');
 436                 print_expression(expression->index);
 437                 print_char(']');
 438         } else {
 439                 print_expression_prec(expression->index, PREC_POSTFIX);
 440                 print_char('[');
 441                 print_expression(expression->array_ref);
 442                 print_char(']');
 443         }
 444 }
 445
 446 /**
 447  * Prints a typeproperty expression (sizeof or __alignof__).
 448  *
 449  * @param expression   the type property expression
 450  */
 451 static void print_typeprop_expression(const typeprop_expression_t *expression)
 452 {
 453         switch (expression->base.kind) {
 454         case EXPR_SIZEOF:  print_string("sizeof");                                   break;
 455         case EXPR_ALIGNOF: print_string(c_mode & _C11 ? "_Alignof" : "__alignof__"); break;
 456         default:           panic("invalid typeprop kind");
 457         }
 458         if (expression->tp_expression != NULL) {
 459                 /* PREC_TOP: always print the '()' here, sizeof x is right but unusual */
 460                 print_expression_prec(expression->tp_expression, PREC_TOP);
 461         } else {
 462                 print_char('(');
 463                 print_type(expression->type);
 464                 print_char(')');
 465         }
 466 }
 467
 468 /**
 469  * Prints a builtin constant expression.
 470  *
 471  * @param expression   the builtin constant expression
 472  */
 473 static void print_builtin_constant(const builtin_constant_expression_t *expression)
 474 {
 475         print_string("__builtin_constant_p(");
 476         print_assignment_expression(expression->value);
 477         print_char(')');
 478 }
 479
 480 /**
 481  * Prints a builtin types compatible expression.
 482  *
 483  * @param expression   the builtin types compatible expression
 484  */
 485 static void print_builtin_types_compatible(
 486                 const builtin_types_compatible_expression_t *expression)
 487 {
 488         print_string("__builtin_types_compatible_p(");
 489         print_type(expression->left);
 490         print_string(", ");
 491         print_type(expression->right);
 492         print_char(')');
 493 }
 494
 495 /**
 496  * Prints a conditional expression.
 497  *
 498  * @param expression   the conditional expression
 499  */
 500 static void print_conditional(const conditional_expression_t *expression)
 501 {
 502         print_expression_prec(expression->condition, PREC_LOGICAL_OR);
 503         if (expression->true_expression != NULL) {
 504                 print_string(" ? ");
 505                 print_expression_prec(expression->true_expression, PREC_EXPRESSION);
 506                 print_string(" : ");
 507         } else {
 508                 print_string(" ?: ");
 509         }
 510         precedence_t prec = c_mode & _CXX ? PREC_ASSIGNMENT : PREC_CONDITIONAL;
 511         print_expression_prec(expression->false_expression, prec);
 512 }
 513
 514 /**
 515  * Prints a va_start expression.
 516  *
 517  * @param expression   the va_start expression
 518  */
 519 static void print_va_start(const va_start_expression_t *const expression)
 520 {
 521         print_string("__builtin_va_start(");
 522         print_assignment_expression(expression->ap);
 523         print_string(", ");
 524         print_assignment_expression(expression->parameter);
 525         print_char(')');
 526 }
 527
 528 /**
 529  * Prints a va_arg expression.
 530  *
 531  * @param expression   the va_arg expression
 532  */
 533 static void print_va_arg(const va_arg_expression_t *expression)
 534 {
 535         print_string("__builtin_va_arg(");
 536         print_assignment_expression(expression->ap);
 537         print_string(", ");
 538         print_type(expression->base.type);
 539         print_char(')');
 540 }
 541
 542 /**
 543  * Prints a va_copy expression.
 544  *
 545  * @param expression   the va_copy expression
 546  */
 547 static void print_va_copy(const va_copy_expression_t *expression)
 548 {
 549         print_string("__builtin_va_copy(");
 550         print_assignment_expression(expression->dst);
 551         print_string(", ");
 552         print_assignment_expression(expression->src);
 553         print_char(')');
 554 }
 555
 556 /**
 557  * Prints a select expression (. or ->).
 558  *
 559  * @param expression   the select expression
 560  */
 561 static void print_select(const select_expression_t *expression)
 562 {
 563         print_expression_prec(expression->compound, PREC_POSTFIX);
 564         /* do not print anything for anonymous struct/union selects
 565          * FIXME: if the anonymous select was a '->' this will print '.'
 566          */
 567         if (expression->compound_entry->base.symbol == NULL)
 568                 return;
 569
 570         if (is_type_pointer(skip_typeref(expression->compound->base.type))) {
 571                 print_string("->");
 572         } else {
 573                 print_char('.');
 574         }
 575         print_string(expression->compound_entry->base.symbol->string);
 576 }
 577
 578 /**
 579  * Prints a type classify expression.
 580  *
 581  * @param expr   the type classify expression
 582  */
 583 static void print_classify_type_expression(
 584         const classify_type_expression_t *const expr)
 585 {
 586         print_string("__builtin_classify_type(");
 587         print_assignment_expression(expr->type_expression);
 588         print_char(')');
 589 }
 590
 591 /**
 592  * Prints a designator.
 593  *
 594  * @param designator  the designator
 595  */
 596 static void print_designator(const designator_t *designator)
 597 {
 598         for ( ; designator != NULL; designator = designator->next) {
 599                 if (designator->symbol == NULL) {
 600                         print_char('[');
 601                         print_expression(designator->array_index);
 602                         print_char(']');
 603                 } else {
 604                         print_char('.');
 605                         print_string(designator->symbol->string);
 606                 }
 607         }
 608 }
 609
 610 /**
 611  * Prints an offsetof expression.
 612  *
 613  * @param expression   the offset expression
 614  */
 615 static void print_offsetof_expression(const offsetof_expression_t *expression)
 616 {
 617         print_string("__builtin_offsetof(");
 618         print_type(expression->type);
 619         print_char(',');
 620         print_designator(expression->designator);
 621         print_char(')');
 622 }
 623
 624 /**
 625  * Prints a statement expression.
 626  *
 627  * @param expression   the statement expression
 628  */
 629 static void print_statement_expression(const statement_expression_t *expression)
 630 {
 631         print_char('(');
 632         print_statement(expression->statement);
 633         print_char(')');
 634 }
 635
 636 static bool needs_parentheses(expression_t const *const expr, unsigned const top_prec)
 637 {
 638         if (expr->base.parenthesized)
 639                 return true;
 640
 641         if (top_prec > get_expression_precedence(expr->base.kind))
 642                 return true;
 643
 644         if (print_parenthesis && top_prec != PREC_BOTTOM) {
 645                 switch (expr->kind) {
 646                 case EXPR_ENUM_CONSTANT:
 647                 case EXPR_FUNCNAME:
 648                 case EXPR_LITERAL_CASES:
 649                 case EXPR_LITERAL_CHARACTER:
 650                 case EXPR_REFERENCE:
 651                 case EXPR_STRING_LITERAL:
 652                         /* Do not print () around subexpressions consisting of a single token. */
 653                         return false;
 654
 655                 default:
 656                         return true;
 657                 }
 658         }
 659
 660         return false;
 661 }
 662
 663 /**
 664  * Prints an expression with parenthesis if needed.
 665  *
 666  * @param expression  the expression to print
 667  * @param top_prec    the precedence of the user of this expression.
 668  */
 669 static void print_expression_prec(expression_t const *expr, unsigned const top_prec)
 670 {
 671         if (expr->kind == EXPR_UNARY_CAST && expr->base.implicit && !print_implicit_casts) {
 672                 expr = expr->unary.value;
 673         }
 674
 675         bool const parenthesized = needs_parentheses(expr, top_prec);
 676
 677         if (parenthesized)
 678                 print_char('(');
 679         switch (expr->kind) {
 680         case EXPR_ALIGNOF:
 681         case EXPR_SIZEOF:                     print_typeprop_expression(     &expr->typeprop);                 break;
 682         case EXPR_ARRAY_ACCESS:               print_array_expression(        &expr->array_access);             break;
 683         case EXPR_BINARY_CASES:               print_binary_expression(       &expr->binary);                   break;
 684         case EXPR_BUILTIN_CONSTANT_P:         print_builtin_constant(        &expr->builtin_constant);         break;
 685         case EXPR_BUILTIN_TYPES_COMPATIBLE_P: print_builtin_types_compatible(&expr->builtin_types_compatible); break;
 686         case EXPR_CALL:                       print_call_expression(         &expr->call);                     break;
 687         case EXPR_CLASSIFY_TYPE:              print_classify_type_expression(&expr->classify_type);            break;
 688         case EXPR_COMPOUND_LITERAL:           print_compound_literal(        &expr->compound_literal);         break;
 689         case EXPR_CONDITIONAL:                print_conditional(             &expr->conditional);              break;
 690         case EXPR_ERROR:                      print_string("$error$");                                         break;
 691         case EXPR_FUNCNAME:                   print_funcname(                &expr->funcname);                 break;
 692         case EXPR_LABEL_ADDRESS:              print_label_address_expression(&expr->label_address);            break;
 693         case EXPR_LITERAL_CASES:              print_literal(                 &expr->literal);                  break;
 694         case EXPR_LITERAL_CHARACTER:          print_string_literal(          &expr->string_literal, '\'');     break;
 695         case EXPR_OFFSETOF:                   print_offsetof_expression(     &expr->offsetofe);                break;
 696         case EXPR_REFERENCE:
 697         case EXPR_ENUM_CONSTANT:              print_reference_expression(    &expr->reference);                break;
 698         case EXPR_SELECT:                     print_select(                  &expr->select);                   break;
 699         case EXPR_STATEMENT:                  print_statement_expression(    &expr->statement);                break;
 700         case EXPR_STRING_LITERAL:             print_string_literal(          &expr->string_literal, '"');      break;
 701         case EXPR_UNARY_CASES:                print_unary_expression(        &expr->unary);                    break;
 702         case EXPR_VA_ARG:                     print_va_arg(                  &expr->va_arge);                  break;
 703         case EXPR_VA_COPY:                    print_va_copy(                 &expr->va_copye);                 break;
 704         case EXPR_VA_START:                   print_va_start(                &expr->va_starte);                break;
 705         }
 706         if (parenthesized)
 707                 print_char(')');
 708 }
 709
 710 static void print_indented_statement(statement_t const *const stmt)
 711 {
 712         switch (stmt->kind) {
 713         case STATEMENT_LABEL:
 714                 break;
 715
 716         case STATEMENT_CASE_LABEL:
 717                 for (int i = 0; i != case_indent; ++i)
 718                         print_char('\t');
 719                 break;
 720
 721         default:
 722                 print_indent();
 723                 break;
 724         }
 725         print_statement(stmt);
 726 }
 727
 728 /**
 729  * Print an compound statement.
 730  *
 731  * @param block  the compound statement
 732  */
 733 static void print_compound_statement(const compound_statement_t *block)
 734 {
 735         print_string("{\n");
 736         ++indent;
 737
 738         for (statement_t const *stmt = block->statements; stmt; stmt = stmt->base.next) {
 739                 print_indented_statement(stmt);
 740                 print_char('\n');
 741         }
 742
 743         --indent;
 744         print_indent();
 745         print_char('}');
 746 }
 747
 748 /**
 749  * Print a return statement.
 750  *
 751  * @param statement  the return statement
 752  */
 753 static void print_return_statement(const return_statement_t *statement)
 754 {
 755         expression_t const *const val = statement->value;
 756         if (val != NULL) {
 757                 print_string("return ");
 758                 print_expression(val);
 759                 print_char(';');
 760         } else {
 761                 print_string("return;");
 762         }
 763 }
 764
 765 /**
 766  * Print an expression statement.
 767  *
 768  * @param statement  the expression statement
 769  */
 770 static void print_expression_statement(const expression_statement_t *statement)
 771 {
 772         print_expression(statement->expression);
 773         print_char(';');
 774 }
 775
 776 /**
 777  * Print a computed goto statement.
 778  *
 779  * @param statement  the computed goto statement
 780  */
 781 static void print_computed_goto_statement(computed_goto_statement_t const *const stmt)
 782 {
 783         print_string("goto *");
 784         print_expression(stmt->expression);
 785         print_char(';');
 786 }
 787
 788 /**
 789  * Print a goto statement.
 790  *
 791  * @param statement  the goto statement
 792  */
 793 static void print_goto_statement(const goto_statement_t *statement)
 794 {
 795         print_string("goto ");
 796         print_string(statement->label->base.symbol->string);
 797         print_char(';');
 798 }
 799
 800 /**
 801  * Print a label statement.
 802  *
 803  * @param statement  the label statement
 804  */
 805 static void print_label_statement(const label_statement_t *statement)
 806 {
 807         print_format("%s:\n", statement->label->base.symbol->string);
 808         print_indented_statement(statement->statement);
 809 }
 810
 811 static void print_inner_statement(statement_t const *const stmt)
 812 {
 813         if (stmt->kind == STATEMENT_COMPOUND) {
 814                 print_char(' ');
 815                 print_compound_statement(&stmt->compound);
 816         } else {
 817                 print_char('\n');
 818                 ++indent;
 819                 print_indented_statement(stmt);
 820                 --indent;
 821         }
 822 }
 823
 824 static void print_after_inner_statement(statement_t const *const stmt)
 825 {
 826         if (stmt->kind == STATEMENT_COMPOUND) {
 827                 print_char(' ');
 828         } else {
 829                 print_char('\n');
 830                 print_indent();
 831         }
 832 }
 833
 834 /**
 835  * Print an if statement.
 836  *
 837  * @param statement  the if statement
 838  */
 839 static void print_if_statement(const if_statement_t *statement)
 840 {
 841         print_string("if (");
 842         print_expression(statement->condition);
 843         print_char(')');
 844         print_inner_statement(statement->true_statement);
 845
 846         statement_t const *const f = statement->false_statement;
 847         if (f) {
 848                 print_after_inner_statement(statement->true_statement);
 849                 print_string("else");
 850                 if (f->kind == STATEMENT_IF) {
 851                         print_char(' ');
 852                         print_if_statement(&f->ifs);
 853                 } else {
 854                         print_inner_statement(f);
 855                 }
 856         }
 857 }
 858
 859 /**
 860  * Print a switch statement.
 861  *
 862  * @param statement  the switch statement
 863  */
 864 static void print_switch_statement(const switch_statement_t *statement)
 865 {
 866         int const old_case_indent = case_indent;
 867         case_indent = indent;
 868
 869         print_string("switch (");
 870         print_expression(statement->expression);
 871         print_char(')');
 872         print_inner_statement(statement->body);
 873
 874         case_indent = old_case_indent;
 875 }
 876
 877 /**
 878  * Print a case label (including the default label).
 879  *
 880  * @param statement  the case label statement
 881  */
 882 static void print_case_label(const case_label_statement_t *statement)
 883 {
 884         if (statement->expression == NULL) {
 885                 print_string("default:\n");
 886         } else {
 887                 print_string("case ");
 888                 print_expression(statement->expression);
 889                 if (statement->end_range != NULL) {
 890                         print_string(" ... ");
 891                         print_expression(statement->end_range);
 892                 }
 893                 print_string(":\n");
 894         }
 895         print_indented_statement(statement->statement);
 896 }
 897
 898 static void print_typedef(const entity_t *entity)
 899 {
 900         print_string("typedef ");
 901         print_type_ext(entity->typedefe.type, entity->base.symbol, NULL);
 902         print_char(';');
 903 }
 904
 905 /**
 906  * returns true if the entity is a compiler generated one and has no real
 907  * correspondenc in the source file
 908  */
 909 static bool is_generated_entity(const entity_t *entity)
 910 {
 911         if (entity->kind == ENTITY_TYPEDEF)
 912                 return entity->typedefe.builtin;
 913
 914         if (is_declaration(entity))
 915                 return entity->declaration.implicit;
 916
 917         return false;
 918 }
 919
 920 /**
 921  * Print a declaration statement.
 922  *
 923  * @param statement   the statement
 924  */
 925 static void print_declaration_statement(
 926                 const declaration_statement_t *statement)
 927 {
 928         bool first = true;
 929         entity_t *entity = statement->declarations_begin;
 930         if (entity == NULL) {
 931                 print_string("/* empty declaration statement */");
 932                 return;
 933         }
 934
 935         entity_t *const end = statement->declarations_end->base.next;
 936         for (; entity != end; entity = entity->base.next) {
 937                 if (entity->kind == ENTITY_ENUM_VALUE)
 938                         continue;
 939                 if (is_generated_entity(entity))
 940                         continue;
 941
 942                 if (!first) {
 943                         print_char('\n');
 944                         print_indent();
 945                 } else {
 946                         first = false;
 947                 }
 948
 949                 print_entity(entity);
 950         }
 951 }
 952
 953 /**
 954  * Print a do-while statement.
 955  *
 956  * @param statement   the statement
 957  */
 958 static void print_do_while_statement(const do_while_statement_t *statement)
 959 {
 960         print_string("do");
 961         print_inner_statement(statement->body);
 962         print_after_inner_statement(statement->body);
 963         print_string("while (");
 964         print_expression(statement->condition);
 965         print_string(");");
 966 }
 967
 968 /**
 969  * Print a for statement.
 970  *
 971  * @param statement   the statement
 972  */
 973 static void print_for_statement(const for_statement_t *statement)
 974 {
 975         if (statement->initialisation || statement->scope.entities || !statement->condition || statement->step) {
 976                 print_string("for (");
 977                 if (statement->initialisation != NULL) {
 978                         print_expression(statement->initialisation);
 979                         print_char(';');
 980                 } else {
 981                         entity_t const *entity = statement->scope.entities;
 982                         for (; entity != NULL; entity = entity->base.next) {
 983                                 if (is_generated_entity(entity))
 984                                         continue;
 985                                 /* FIXME display of multiple declarations is wrong */
 986                                 print_declaration(entity);
 987                         }
 988                 }
 989                 if (statement->condition != NULL) {
 990                         print_char(' ');
 991                         print_expression(statement->condition);
 992                 }
 993                 print_char(';');
 994                 if (statement->step != NULL) {
 995                         print_char(' ');
 996                         print_expression(statement->step);
 997                 }
 998         } else {
 999                 print_string("while (");
1000                 print_expression(statement->condition);
1001         }
1002         print_char(')');
1003         print_inner_statement(statement->body);
1004 }
1005
1006 /**
1007  * Print assembler arguments.
1008  *
1009  * @param arguments   the arguments
1010  */
1011 static void print_asm_arguments(asm_argument_t const *const arguments)
1012 {
1013         print_string(" :");
1014         separator_t sep = { " ", ", " };
1015         for (asm_argument_t const *i = arguments; i; i = i->next) {
1016                 print_string(sep_next(&sep));
1017                 if (i->symbol)
1018                         print_format("[%s] ", i->symbol->string);
1019                 print_quoted_string(&i->constraints, '"');
1020                 print_string(" (");
1021                 print_expression(i->expression);
1022                 print_char(')');
1023         }
1024 }
1025
1026 /**
1027  * Print assembler clobbers.
1028  *
1029  * @param clobbers   the clobbers
1030  */
1031 static void print_asm_clobbers(asm_clobber_t const *const clobbers)
1032 {
1033         print_string(" :");
1034         separator_t sep = { " ", ", " };
1035         for (asm_clobber_t const *i = clobbers; i; i = i->next) {
1036                 print_string(sep_next(&sep));
1037                 print_quoted_string(&i->clobber, '"');
1038         }
1039 }
1040
1041 static void print_asm_labels(asm_label_t const *const labels)
1042 {
1043         print_string(" :");
1044         separator_t sep = { " ", ", " };
1045         for (asm_label_t const *i = labels; i; i = i->next) {
1046                 print_string(sep_next(&sep));
1047                 print_string(i->label->base.symbol->string);
1048         }
1049 }
1050
1051 /**
1052  * Print an assembler statement.
1053  *
1054  * @param stmt   the statement
1055  */
1056 static void print_asm_statement(asm_statement_t const *const stmt)
1057 {
1058         print_string("asm");
1059         if (stmt->is_volatile) print_string(" volatile");
1060         if (stmt->labels)      print_string(" goto");
1061         print_char('(');
1062         print_quoted_string(&stmt->asm_text, '"');
1063
1064         unsigned const n =
1065                 stmt->labels   ? 4 :
1066                 stmt->clobbers ? 3 :
1067                 stmt->inputs   ? 2 :
1068                 stmt->outputs  ? 1 :
1069                 0;
1070         if (n >= 1) print_asm_arguments(stmt->outputs);
1071         if (n >= 2) print_asm_arguments(stmt->inputs);
1072         if (n >= 3) print_asm_clobbers( stmt->clobbers);
1073         if (n >= 4) print_asm_labels(   stmt->labels);
1074
1075         print_string(");");
1076 }
1077
1078 /**
1079  * Print a microsoft __try statement.
1080  *
1081  * @param statement   the statement
1082  */
1083 static void print_ms_try_statement(const ms_try_statement_t *statement)
1084 {
1085         print_string("__try");
1086         print_inner_statement(statement->try_statement);
1087         print_after_inner_statement(statement->try_statement);
1088         if (statement->except_expression != NULL) {
1089                 print_string("__except(");
1090                 print_expression(statement->except_expression);
1091                 print_char(')');
1092         } else {
1093                 print_string("__finally");
1094         }
1095         print_inner_statement(statement->final_statement);
1096 }
1097
1098 /**
1099  * Print a microsoft __leave statement.
1100  *
1101  * @param statement   the statement
1102  */
1103 static void print_leave_statement(const leave_statement_t *statement)
1104 {
1105         (void)statement;
1106         print_string("__leave;");
1107 }
1108
1109 /**
1110  * Print a statement.
1111  *
1112  * @param statement   the statement
1113  */
1114 void print_statement(statement_t const *const stmt)
1115 {
1116         switch (stmt->kind) {
1117         case STATEMENT_ASM:           print_asm_statement(          &stmt->asms);          break;
1118         case STATEMENT_BREAK:         print_string("break;");                              break;
1119         case STATEMENT_CASE_LABEL:    print_case_label(             &stmt->case_label);    break;
1120         case STATEMENT_COMPOUND:      print_compound_statement(     &stmt->compound);      break;
1121         case STATEMENT_COMPUTED_GOTO: print_computed_goto_statement(&stmt->computed_goto); break;
1122         case STATEMENT_CONTINUE:      print_string("continue;");                           break;
1123         case STATEMENT_DECLARATION:   print_declaration_statement(  &stmt->declaration);   break;
1124         case STATEMENT_DO_WHILE:      print_do_while_statement(     &stmt->do_while);      break;
1125         case STATEMENT_EMPTY:         print_char(';');                                     break;
1126         case STATEMENT_ERROR:         print_string("$error statement$");                   break;
1127         case STATEMENT_EXPRESSION:    print_expression_statement(   &stmt->expression);    break;
1128         case STATEMENT_FOR:           print_for_statement(          &stmt->fors);          break;
1129         case STATEMENT_GOTO:          print_goto_statement(         &stmt->gotos);         break;
1130         case STATEMENT_IF:            print_if_statement(           &stmt->ifs);           break;
1131         case STATEMENT_LABEL:         print_label_statement(        &stmt->label);         break;
1132         case STATEMENT_LEAVE:         print_leave_statement(        &stmt->leave);         break;
1133         case STATEMENT_MS_TRY:        print_ms_try_statement(       &stmt->ms_try);        break;
1134         case STATEMENT_RETURN:        print_return_statement(       &stmt->returns);       break;
1135         case STATEMENT_SWITCH:        print_switch_statement(       &stmt->switchs);       break;
1136         }
1137 }
1138
1139 /**
1140  * Print a storage class.
1141  *
1142  * @param storage_class   the storage class
1143  */
1144 static void print_storage_class(storage_class_tag_t storage_class)
1145 {
1146         switch (storage_class) {
1147         case STORAGE_CLASS_NONE:     return;
1148         case STORAGE_CLASS_TYPEDEF:  print_string("typedef ");  return;
1149         case STORAGE_CLASS_EXTERN:   print_string("extern ");   return;
1150         case STORAGE_CLASS_STATIC:   print_string("static ");   return;
1151         case STORAGE_CLASS_AUTO:     print_string("auto ");     return;
1152         case STORAGE_CLASS_REGISTER: print_string("register "); return;
1153         }
1154         panic("invalid storage class");
1155 }
1156
1157 /**
1158  * Print an initializer.
1159  *
1160  * @param initializer  the initializer
1161  */
1162 void print_initializer(const initializer_t *initializer)
1163 {
1164         if (initializer == NULL) {
1165                 print_string("{}");
1166                 return;
1167         }
1168
1169         switch (initializer->kind) {
1170         case INITIALIZER_STRING:
1171         case INITIALIZER_VALUE:
1172                 print_assignment_expression(initializer->value.value);
1173                 return;
1174
1175         case INITIALIZER_LIST: {
1176                 print_string("{ ");
1177                 const initializer_list_t *list = &initializer->list;
1178
1179                 for (size_t i = 0 ; i < list->len; ++i) {
1180                         const initializer_t *sub_init = list->initializers[i];
1181                         print_initializer(list->initializers[i]);
1182                         if (i < list->len-1) {
1183                                 if (sub_init == NULL || sub_init->kind != INITIALIZER_DESIGNATOR)
1184                                         print_string(", ");
1185                         }
1186                 }
1187                 print_string(" }");
1188                 return;
1189         }
1190
1191         case INITIALIZER_DESIGNATOR:
1192                 print_designator(initializer->designator.designator);
1193                 print_string(" = ");
1194                 return;
1195         }
1196
1197         panic("invalid initializer kind found");
1198 }
1199
1200 #if 0
1201 /**
1202  * Print microsoft extended declaration modifiers.
1203  */
1204 static void print_ms_modifiers(const declaration_t *declaration)
1205 {
1206         if ((c_mode & _MS) == 0)
1207                 return;
1208
1209         decl_modifiers_t modifiers = declaration->modifiers;
1210
1211         separator_t sep = { "__declspec(", ", " };
1212
1213         if (declaration->base.kind == ENTITY_VARIABLE) {
1214                 variable_t *variable = (variable_t*)declaration;
1215                 if (variable->alignment != 0
1216                                 || variable->get_property_sym != NULL
1217                                 || variable->put_property_sym != NULL) {
1218                         if (variable->alignment != 0) {
1219                                 print_format("%salign(%u)", sep_next(&sep), variable->alignment);
1220                         }
1221                         if (variable->get_property_sym != NULL
1222                                         || variable->put_property_sym != NULL) {
1223                                 char *comma = "";
1224                                 print_format("%sproperty(", sep_next(&sep));
1225                                 if (variable->get_property_sym != NULL) {
1226                                         print_format("get=%s", variable->get_property_sym->string);
1227                                         comma = ", ";
1228                                 }
1229                                 if (variable->put_property_sym != NULL)
1230                                         print_format("%sput=%s", comma, variable->put_property_sym->string);
1231                                 print_char(')');
1232                         }
1233                 }
1234         }
1235
1236         /* DM_FORCEINLINE handled outside. */
1237         if ((modifiers & ~DM_FORCEINLINE) != 0) {
1238                 if (modifiers & DM_DLLIMPORT) {
1239                         print_format("%sdllimport", sep_next(&sep));
1240                 }
1241                 if (modifiers & DM_DLLEXPORT) {
1242                         print_format("%sdllexport", sep_next(&sep));
1243                 }
1244                 if (modifiers & DM_THREAD) {
1245                         print_format("%sthread", sep_next(&sep));
1246                 }
1247                 if (modifiers & DM_NAKED) {
1248                         print_format("%snaked", sep_next(&sep));
1249                 }
1250                 if (modifiers & DM_THREAD) {
1251                         print_format("%sthread", sep_next(&sep));
1252                 }
1253                 if (modifiers & DM_SELECTANY) {
1254                         print_format("%sselectany", sep_next(&sep));
1255                 }
1256                 if (modifiers & DM_NOTHROW) {
1257                         print_format("%snothrow", sep_next(&sep));
1258                 }
1259                 if (modifiers & DM_NORETURN) {
1260                         print_format("%snoreturn", sep_next(&sep));
1261                 }
1262                 if (modifiers & DM_NOINLINE) {
1263                         print_format("%snoinline", sep_next(&sep));
1264                 }
1265                 if (modifiers & DM_DEPRECATED) {
1266                         print_format("%sdeprecated", sep_next(&sep));
1267                         if (declaration->deprecated_string != NULL)
1268                                 print_format("(\"%s\")",
1269                                         declaration->deprecated_string);
1270                 }
1271                 if (modifiers & DM_RESTRICT) {
1272                         print_format("%srestrict", sep_next(&sep));
1273                 }
1274                 if (modifiers & DM_NOALIAS) {
1275                         print_format("%snoalias", sep_next(&sep));
1276                 }
1277         }
1278
1279         if (!sep_at_first(&sep))
1280                 print_string(") ");
1281 }
1282 #endif
1283
1284 static void print_scope(const scope_t *scope)
1285 {
1286         const entity_t *entity = scope->entities;
1287         for ( ; entity != NULL; entity = entity->base.next) {
1288                 print_indent();
1289                 print_entity(entity);
1290                 print_char('\n');
1291         }
1292 }
1293
1294 static void print_namespace(const namespace_t *namespace)
1295 {
1296         print_string("namespace ");
1297         if (namespace->base.symbol != NULL) {
1298                 print_string(namespace->base.symbol->string);
1299                 print_char(' ');
1300         }
1301
1302         print_string("{\n");
1303         ++indent;
1304
1305         print_scope(&namespace->members);
1306
1307         --indent;
1308         print_indent();
1309         print_string("}\n");
1310 }
1311
1312 /**
1313  * Print a variable or function declaration
1314  */
1315 void print_declaration(const entity_t *entity)
1316 {
1317         assert(is_declaration(entity));
1318         const declaration_t *declaration = &entity->declaration;
1319
1320         print_storage_class((storage_class_tag_t)declaration->declared_storage_class);
1321         if (entity->kind == ENTITY_FUNCTION) {
1322                 function_t *function = (function_t*)declaration;
1323                 if (function->is_inline) {
1324                         if (declaration->modifiers & DM_FORCEINLINE) {
1325                                 print_string("__forceinline ");
1326                         } else if (declaration->modifiers & DM_MICROSOFT_INLINE) {
1327                                 print_string("__inline ");
1328                         } else {
1329                                 print_string("inline ");
1330                         }
1331                 }
1332         }
1333         //print_ms_modifiers(declaration);
1334         switch (entity->kind) {
1335                 case ENTITY_FUNCTION:
1336                         print_type_ext(entity->declaration.type, entity->base.symbol,
1337                                         &entity->function.parameters);
1338
1339                         if (entity->function.body != NULL) {
1340                                 print_char('\n');
1341                                 print_indented_statement(entity->function.body);
1342                                 print_char('\n');
1343                                 return;
1344                         }
1345                         break;
1346
1347                 case ENTITY_VARIABLE:
1348                         if (entity->variable.thread_local)
1349                                 print_string(c_mode & _C11 ? "_Thread_local " : "__thread ");
1350                         print_type_ext(declaration->type, declaration->base.symbol, NULL);
1351                         if (entity->variable.initializer != NULL) {
1352                                 print_string(" = ");
1353                                 print_initializer(entity->variable.initializer);
1354                         }
1355                         break;
1356
1357                 case ENTITY_COMPOUND_MEMBER:
1358                         print_type_ext(declaration->type, declaration->base.symbol, NULL);
1359                         if (entity->compound_member.bitfield) {
1360                                 print_format(" : %u", entity->compound_member.bit_size);
1361                         }
1362                         break;
1363
1364                 default:
1365                         print_type_ext(declaration->type, declaration->base.symbol, NULL);
1366                         break;
1367         }
1368         print_char(';');
1369 }
1370
1371 /**
1372  * Prints an expression.
1373  *
1374  * @param expression  the expression
1375  */
1376 void print_expression(const expression_t *expression)
1377 {
1378         print_expression_prec(expression, PREC_BOTTOM);
1379 }
1380
1381 /**
1382  * Print a declaration.
1383  *
1384  * @param declaration  the declaration
1385  */
1386 void print_entity(const entity_t *entity)
1387 {
1388         if (entity->base.namespc != NAMESPACE_NORMAL && entity->base.symbol == NULL)
1389                 return;
1390
1391         switch ((entity_kind_tag_t)entity->kind) {
1392         case ENTITY_VARIABLE:
1393         case ENTITY_PARAMETER:
1394         case ENTITY_COMPOUND_MEMBER:
1395         case ENTITY_FUNCTION:
1396                 print_declaration(entity);
1397                 return;
1398         case ENTITY_TYPEDEF:
1399                 print_typedef(entity);
1400                 return;
1401         case ENTITY_CLASS:
1402                 /* TODO */
1403                 print_string("class ");
1404                 print_string(entity->base.symbol->string);
1405                 print_string("; /* TODO */\n");
1406                 return;
1407         case ENTITY_STRUCT:
1408                 print_string("struct ");
1409                 goto print_compound;
1410         case ENTITY_UNION:
1411                 print_string("union ");
1412 print_compound:
1413                 print_string(entity->base.symbol->string);
1414                 if (entity->compound.complete) {
1415                         print_char(' ');
1416                         print_compound_definition(&entity->compound);
1417                 }
1418                 print_char(';');
1419                 return;
1420         case ENTITY_ENUM:
1421                 print_string("enum ");
1422                 print_string(entity->base.symbol->string);
1423                 print_char(' ');
1424                 print_enum_definition(&entity->enume);
1425                 print_char(';');
1426                 return;
1427         case ENTITY_NAMESPACE:
1428                 print_namespace(&entity->namespacee);
1429                 return;
1430         case ENTITY_LOCAL_LABEL:
1431                 print_string("__label__ ");
1432                 print_string(entity->base.symbol->string);
1433                 print_char(';');
1434                 return;
1435         case ENTITY_LABEL:
1436         case ENTITY_ENUM_VALUE:
1437                 panic("print_entity used on unexpected entity type");
1438         }
1439         panic("Invalid entity type encountered");
1440 }
1441
1442 /**
1443  * Print the AST of a translation unit.
1444  *
1445  * @param unit   the translation unit
1446  */
1447 void print_ast(const translation_unit_t *unit)
1448 {
1449         entity_t *entity = unit->scope.entities;
1450         for ( ; entity != NULL; entity = entity->base.next) {
1451                 if (entity->kind == ENTITY_ENUM_VALUE)
1452                         continue;
1453                 if (entity->base.namespc != NAMESPACE_NORMAL
1454                                 && entity->base.symbol == NULL)
1455                         continue;
1456                 if (is_generated_entity(entity))
1457                         continue;
1458
1459                 print_indent();
1460                 print_entity(entity);
1461                 print_char('\n');
1462         }
1463 }
1464
1465 expression_classification_t is_constant_initializer(const initializer_t *initializer)
1466 {
1467         switch (initializer->kind) {
1468         case INITIALIZER_STRING:
1469         case INITIALIZER_DESIGNATOR:
1470                 return EXPR_CLASS_CONSTANT;
1471
1472         case INITIALIZER_VALUE:
1473                 return is_linker_constant(initializer->value.value);
1474
1475         case INITIALIZER_LIST: {
1476                 expression_classification_t all = EXPR_CLASS_CONSTANT;
1477                 for (size_t i = 0; i < initializer->list.len; ++i) {
1478                         initializer_t *sub_initializer = initializer->list.initializers[i];
1479                         expression_classification_t const cur = is_constant_initializer(sub_initializer);
1480                         if (all > cur) {
1481                                 all = cur;
1482                         }
1483                 }
1484                 return all;
1485         }
1486         }
1487         panic("invalid initializer kind found");
1488 }
1489
1490 /**
1491  * Checks if an expression references an object with a constant/known location
1492  * to the linker. Example:
1493  *  - "x", "*&x" with x being a global variable. The value of x need not be
1494  *         constant but the address of x is.
1495  *  - "a.b.c" when a has a constant/known location to the linker
1496  */
1497 static expression_classification_t is_object_with_linker_constant_address(
1498         const expression_t *expression)
1499 {
1500         switch (expression->kind) {
1501         case EXPR_UNARY_DEREFERENCE:
1502                 return is_linker_constant(expression->unary.value);
1503
1504         case EXPR_COMPOUND_LITERAL: {
1505                 const compound_literal_expression_t *literal
1506                         = &expression->compound_literal;
1507                 return literal->global_scope ||
1508                        ((literal->type->base.qualifiers & TYPE_QUALIFIER_CONST)
1509                         && is_constant_initializer(literal->initializer));
1510         }
1511
1512         case EXPR_SELECT: {
1513                 type_t *base_type = skip_typeref(expression->select.compound->base.type);
1514                 if (is_type_pointer(base_type)) {
1515                         /* it's a -> */
1516                         return is_linker_constant(expression->select.compound);
1517                 } else {
1518                         return is_object_with_linker_constant_address(expression->select.compound);
1519                 }
1520         }
1521
1522         case EXPR_ARRAY_ACCESS: {
1523                 expression_classification_t const ref = is_linker_constant(expression->array_access.array_ref);
1524                 expression_classification_t const idx = is_constant_expression(expression->array_access.index);
1525                 return ref < idx ? ref : idx;
1526         }
1527
1528         case EXPR_REFERENCE: {
1529                 entity_t *entity = expression->reference.entity;
1530                 if (!is_declaration(entity))
1531                         return EXPR_CLASS_VARIABLE;
1532
1533                 switch ((storage_class_tag_t)entity->declaration.storage_class) {
1534                 case STORAGE_CLASS_NONE:
1535                 case STORAGE_CLASS_EXTERN:
1536                 case STORAGE_CLASS_STATIC:
1537                         return
1538                                 entity->kind != ENTITY_VARIABLE ||
1539                                 !entity->variable.thread_local ? EXPR_CLASS_CONSTANT :
1540                                 EXPR_CLASS_VARIABLE;
1541
1542                 case STORAGE_CLASS_REGISTER:
1543                 case STORAGE_CLASS_TYPEDEF:
1544                 case STORAGE_CLASS_AUTO:
1545                         break;
1546                 }
1547                 return EXPR_CLASS_VARIABLE;
1548         }
1549
1550         case EXPR_ERROR:
1551                 return EXPR_CLASS_ERROR;
1552
1553         default:
1554                 return EXPR_CLASS_VARIABLE;
1555         }
1556 }
1557
1558 expression_classification_t is_linker_constant(const expression_t *expression)
1559 {
1560         switch (expression->kind) {
1561         case EXPR_STRING_LITERAL:
1562         case EXPR_FUNCNAME:
1563         case EXPR_LABEL_ADDRESS:
1564                 return EXPR_CLASS_CONSTANT;
1565
1566         case EXPR_COMPOUND_LITERAL:
1567                 return is_constant_initializer(expression->compound_literal.initializer);
1568
1569         case EXPR_UNARY_TAKE_ADDRESS:
1570                 return is_object_with_linker_constant_address(expression->unary.value);
1571
1572         case EXPR_UNARY_DEREFERENCE: {
1573                 type_t *real_type
1574                         = revert_automatic_type_conversion(expression->unary.value);
1575                 /* dereferencing a function is a NOP */
1576                 if (is_type_function(real_type)) {
1577                         return is_linker_constant(expression->unary.value);
1578                 }
1579                 /* FALLTHROUGH */
1580         }
1581
1582         case EXPR_UNARY_CAST: {
1583                 type_t *dest = skip_typeref(expression->base.type);
1584                 if (!is_type_pointer(dest) && (
1585                                 dest->kind != TYPE_ATOMIC                                               ||
1586                                 !(get_atomic_type_flags(dest->atomic.akind) & ATOMIC_TYPE_FLAG_INTEGER) ||
1587                                 get_atomic_type_size(dest->atomic.akind) < get_type_size(type_void_ptr)
1588                     ))
1589                         return is_constant_expression(expression);
1590
1591                 return is_linker_constant(expression->unary.value);
1592         }
1593
1594         case EXPR_BINARY_ADD:
1595         case EXPR_BINARY_SUB: {
1596                 expression_t *const left  = expression->binary.left;
1597                 expression_t *const right = expression->binary.right;
1598                 type_t       *const ltype = skip_typeref(left->base.type);
1599                 type_t       *const rtype = skip_typeref(right->base.type);
1600
1601                 if (is_type_pointer(ltype)) {
1602                         expression_classification_t const l = is_linker_constant(left);
1603                         expression_classification_t const r = is_constant_expression(right);
1604                         return l < r ? l : r;
1605                 } else if (is_type_pointer(rtype)) {
1606                         expression_classification_t const l = is_constant_expression(left);
1607                         expression_classification_t const r = is_linker_constant(right);
1608                         return l < r ? l : r;
1609                 } else if (!is_type_valid(ltype) || !is_type_valid(rtype)) {
1610                         return EXPR_CLASS_ERROR;
1611                 } else {
1612                         return is_constant_expression(expression);
1613                 }
1614         }
1615
1616         case EXPR_REFERENCE: {
1617                 entity_t *entity = expression->reference.entity;
1618                 if (!is_declaration(entity))
1619                         return EXPR_CLASS_VARIABLE;
1620
1621                 type_t *type = skip_typeref(entity->declaration.type);
1622                 if (is_type_function(type))
1623                         return EXPR_CLASS_CONSTANT;
1624                 if (is_type_array(type)) {
1625                         return is_object_with_linker_constant_address(expression);
1626                 }
1627                 /* Prevent stray errors */
1628                 if (!is_type_valid(type))
1629                         return EXPR_CLASS_ERROR;
1630                 return EXPR_CLASS_VARIABLE;
1631         }
1632
1633         case EXPR_ARRAY_ACCESS: {
1634                 type_t *const type =
1635                         skip_typeref(revert_automatic_type_conversion(expression));
1636                 if (!is_type_array(type))
1637                         return EXPR_CLASS_VARIABLE;
1638                 return is_linker_constant(expression->array_access.array_ref);
1639         }
1640
1641         case EXPR_CONDITIONAL: {
1642                 expression_t *const c = expression->conditional.condition;
1643                 expression_classification_t const cclass = is_constant_expression(c);
1644                 if (cclass != EXPR_CLASS_CONSTANT)
1645                         return cclass;
1646
1647                 if (fold_constant_to_bool(c)) {
1648                         expression_t const *const t = expression->conditional.true_expression;
1649                         return is_linker_constant(t != NULL ? t : c);
1650                 } else {
1651                         return is_linker_constant(expression->conditional.false_expression);
1652                 }
1653         }
1654
1655         case EXPR_SELECT: {
1656                 entity_t *entity = expression->select.compound_entry;
1657                 if (!is_declaration(entity))
1658                         return EXPR_CLASS_VARIABLE;
1659                 type_t *type = skip_typeref(entity->declaration.type);
1660                 if (is_type_array(type)) {
1661                         /* arrays automatically convert to their address */
1662                         expression_t *compound  = expression->select.compound;
1663                         type_t       *base_type = skip_typeref(compound->base.type);
1664                         if (is_type_pointer(base_type)) {
1665                                 /* it's a -> */
1666                                 return is_linker_constant(compound);
1667                         } else {
1668                                 return is_object_with_linker_constant_address(compound);
1669                         }
1670                 }
1671                 return EXPR_CLASS_VARIABLE;
1672         }
1673
1674         default:
1675                 return is_constant_expression(expression);
1676         }
1677 }
1678
1679 /**
1680  * Check if the given expression is a call to a builtin function
1681  * returning a constant result.
1682  */
1683 static expression_classification_t is_builtin_const_call(const expression_t *expression)
1684 {
1685         expression_t *function = expression->call.function;
1686         if (function->kind != EXPR_REFERENCE)
1687                 return EXPR_CLASS_VARIABLE;
1688         reference_expression_t *ref = &function->reference;
1689         if (ref->entity->kind != ENTITY_FUNCTION)
1690                 return EXPR_CLASS_VARIABLE;
1691
1692         switch (ref->entity->function.btk) {
1693         case BUILTIN_INF:
1694         case BUILTIN_NAN:
1695                 return EXPR_CLASS_CONSTANT;
1696         default:
1697                 return EXPR_CLASS_VARIABLE;
1698         }
1699
1700 }
1701
1702 static expression_classification_t is_constant_pointer(const expression_t *expression)
1703 {
1704         expression_classification_t const expr_class = is_constant_expression(expression);
1705         if (expr_class != EXPR_CLASS_VARIABLE)
1706                 return expr_class;
1707
1708         switch (expression->kind) {
1709         case EXPR_UNARY_CAST:
1710                 return is_constant_pointer(expression->unary.value);
1711         default:
1712                 return EXPR_CLASS_VARIABLE;
1713         }
1714 }
1715
1716 static expression_classification_t is_object_with_constant_address(const expression_t *expression)
1717 {
1718         switch (expression->kind) {
1719         case EXPR_SELECT: {
1720                 expression_t *compound      = expression->select.compound;
1721                 type_t       *compound_type = compound->base.type;
1722                 compound_type = skip_typeref(compound_type);
1723                 if (is_type_pointer(compound_type)) {
1724                         return is_constant_pointer(compound);
1725                 } else {
1726                         return is_object_with_constant_address(compound);
1727                 }
1728         }
1729
1730         case EXPR_ARRAY_ACCESS: {
1731                 array_access_expression_t const* const array_access =
1732                         &expression->array_access;
1733                 expression_classification_t const idx_class = is_constant_expression(array_access->index);
1734                 if (idx_class != EXPR_CLASS_CONSTANT)
1735                         return idx_class;
1736                 expression_classification_t const ref_addr = is_object_with_constant_address(array_access->array_ref);
1737                 expression_classification_t const ref_ptr  = is_constant_pointer(array_access->array_ref);
1738                 return ref_addr > ref_ptr ? ref_addr : ref_ptr;
1739         }
1740
1741         case EXPR_UNARY_DEREFERENCE:
1742                 return is_constant_pointer(expression->unary.value);
1743
1744         case EXPR_ERROR:
1745                 return EXPR_CLASS_ERROR;
1746
1747         default:
1748                 return EXPR_CLASS_VARIABLE;
1749         }
1750 }
1751
1752 expression_classification_t is_constant_expression(const expression_t *expression)
1753 {
1754         switch (expression->kind) {
1755         case EXPR_LITERAL_CHARACTER:
1756         case EXPR_BUILTIN_TYPES_COMPATIBLE_P:
1757         case EXPR_ENUM_CONSTANT:
1758         case EXPR_LITERAL_BOOLEAN:
1759         case EXPR_LITERAL_MS_NOOP:
1760                 return EXPR_CLASS_CONSTANT;
1761
1762         {
1763                 type_t *type;
1764         case EXPR_ALIGNOF:
1765                 type = skip_typeref(expression->typeprop.type);
1766                 goto check_type;
1767
1768         case EXPR_CLASSIFY_TYPE:
1769                 type = skip_typeref(expression->classify_type.type_expression->base.type);
1770                 goto check_type;
1771
1772         case EXPR_LITERAL_INTEGER:
1773         case EXPR_LITERAL_FLOATINGPOINT:
1774                 type = skip_typeref(expression->base.type);
1775                 goto check_type;
1776
1777         case EXPR_OFFSETOF:
1778                 type = skip_typeref(expression->offsetofe.type);
1779                 goto check_type;
1780
1781         case EXPR_SIZEOF:
1782                 type = skip_typeref(expression->typeprop.type);
1783                 if (is_type_array(type) && type->array.is_vla)
1784                         return EXPR_CLASS_VARIABLE;
1785                 goto check_type;
1786
1787 check_type:
1788                 return is_type_valid(type) ? EXPR_CLASS_CONSTANT : EXPR_CLASS_ERROR;
1789         }
1790
1791         case EXPR_BUILTIN_CONSTANT_P: {
1792                 expression_classification_t const c = is_constant_expression(expression->builtin_constant.value);
1793                 return c != EXPR_CLASS_ERROR ? EXPR_CLASS_CONSTANT : EXPR_CLASS_ERROR;
1794         }
1795
1796         case EXPR_STRING_LITERAL:
1797         case EXPR_FUNCNAME:
1798         case EXPR_LABEL_ADDRESS:
1799         case EXPR_SELECT:
1800         case EXPR_VA_START:
1801         case EXPR_VA_ARG:
1802         case EXPR_VA_COPY:
1803         case EXPR_STATEMENT:
1804         case EXPR_UNARY_POSTFIX_INCREMENT:
1805         case EXPR_UNARY_POSTFIX_DECREMENT:
1806         case EXPR_UNARY_PREFIX_INCREMENT:
1807         case EXPR_UNARY_PREFIX_DECREMENT:
1808         case EXPR_UNARY_ASSUME: /* has VOID type */
1809         case EXPR_UNARY_DEREFERENCE:
1810         case EXPR_UNARY_DELETE:
1811         case EXPR_UNARY_DELETE_ARRAY:
1812         case EXPR_UNARY_THROW:
1813         case EXPR_BINARY_ASSIGN:
1814         case EXPR_BINARY_MUL_ASSIGN:
1815         case EXPR_BINARY_DIV_ASSIGN:
1816         case EXPR_BINARY_MOD_ASSIGN:
1817         case EXPR_BINARY_ADD_ASSIGN:
1818         case EXPR_BINARY_SUB_ASSIGN:
1819         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
1820         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
1821         case EXPR_BINARY_BITWISE_AND_ASSIGN:
1822         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
1823         case EXPR_BINARY_BITWISE_OR_ASSIGN:
1824         case EXPR_BINARY_COMMA:
1825         case EXPR_ARRAY_ACCESS:
1826                 return EXPR_CLASS_VARIABLE;
1827
1828         case EXPR_REFERENCE: {
1829                 type_t *const type = skip_typeref(expression->base.type);
1830                 return is_type_valid(type) ? EXPR_CLASS_VARIABLE : EXPR_CLASS_ERROR;
1831         }
1832
1833         case EXPR_UNARY_TAKE_ADDRESS:
1834                 return is_object_with_constant_address(expression->unary.value);
1835
1836         case EXPR_CALL:
1837                 return is_builtin_const_call(expression);
1838
1839         case EXPR_UNARY_NEGATE:
1840         case EXPR_UNARY_PLUS:
1841         case EXPR_UNARY_COMPLEMENT:
1842         case EXPR_UNARY_NOT:
1843                 return is_constant_expression(expression->unary.value);
1844
1845         case EXPR_UNARY_IMAG:
1846         case EXPR_UNARY_REAL: {
1847                 type_t *type = skip_typeref(expression->base.type);
1848                 if (!is_type_valid(type))
1849                         return EXPR_CLASS_ERROR;
1850                 return is_constant_expression(expression->unary.value);
1851         }
1852
1853
1854         case EXPR_UNARY_CAST: {
1855                 type_t *const type = skip_typeref(expression->base.type);
1856                 if (is_type_scalar(type) || is_type_complex(type))
1857                         return is_constant_expression(expression->unary.value);
1858                 if (!is_type_valid(type))
1859                         return EXPR_CLASS_ERROR;
1860                 return EXPR_CLASS_VARIABLE;
1861         }
1862
1863         case EXPR_BINARY_ADD:
1864         case EXPR_BINARY_SUB:
1865         case EXPR_BINARY_MUL:
1866         case EXPR_BINARY_DIV:
1867         case EXPR_BINARY_MOD:
1868         case EXPR_BINARY_EQUAL:
1869         case EXPR_BINARY_NOTEQUAL:
1870         case EXPR_BINARY_LESS:
1871         case EXPR_BINARY_LESSEQUAL:
1872         case EXPR_BINARY_GREATER:
1873         case EXPR_BINARY_GREATEREQUAL:
1874         case EXPR_BINARY_BITWISE_AND:
1875         case EXPR_BINARY_BITWISE_OR:
1876         case EXPR_BINARY_BITWISE_XOR:
1877         case EXPR_BINARY_SHIFTLEFT:
1878         case EXPR_BINARY_SHIFTRIGHT:
1879         case EXPR_BINARY_ISGREATER:
1880         case EXPR_BINARY_ISGREATEREQUAL:
1881         case EXPR_BINARY_ISLESS:
1882         case EXPR_BINARY_ISLESSEQUAL:
1883         case EXPR_BINARY_ISLESSGREATER:
1884         case EXPR_BINARY_ISUNORDERED: {
1885                 expression_classification_t const l = is_constant_expression(expression->binary.left);
1886                 expression_classification_t const r = is_constant_expression(expression->binary.right);
1887                 return l < r ? l : r;
1888         }
1889
1890         case EXPR_BINARY_LOGICAL_AND: {
1891                 expression_t const         *const left   = expression->binary.left;
1892                 expression_classification_t const lclass = is_constant_expression(left);
1893                 if (lclass != EXPR_CLASS_CONSTANT)
1894                         return lclass;
1895                 if (!fold_constant_to_bool(left))
1896                         return EXPR_CLASS_CONSTANT;
1897                 return is_constant_expression(expression->binary.right);
1898         }
1899
1900         case EXPR_BINARY_LOGICAL_OR: {
1901                 expression_t const         *const left   = expression->binary.left;
1902                 expression_classification_t const lclass = is_constant_expression(left);
1903                 if (lclass != EXPR_CLASS_CONSTANT)
1904                         return lclass;
1905                 if (fold_constant_to_bool(left))
1906                         return EXPR_CLASS_CONSTANT;
1907                 return is_constant_expression(expression->binary.right);
1908         }
1909
1910         case EXPR_COMPOUND_LITERAL:
1911                 return is_constant_initializer(expression->compound_literal.initializer);
1912
1913         case EXPR_CONDITIONAL: {
1914                 expression_t               *const condition = expression->conditional.condition;
1915                 expression_classification_t const cclass    = is_constant_expression(condition);
1916                 if (cclass != EXPR_CLASS_CONSTANT)
1917                         return cclass;
1918
1919                 if (fold_constant_to_bool(condition)) {
1920                         expression_t const *const t = expression->conditional.true_expression;
1921                         return t == NULL ? EXPR_CLASS_CONSTANT : is_constant_expression(t);
1922                 } else {
1923                         return is_constant_expression(expression->conditional.false_expression);
1924                 }
1925         }
1926
1927         case EXPR_ERROR:
1928                 return EXPR_CLASS_ERROR;
1929         }
1930         panic("invalid expression");
1931 }
1932
1933 void init_ast(void)
1934 {
1935         obstack_init(&ast_obstack);
1936 }
1937
1938 void exit_ast(void)
1939 {
1940         obstack_free(&ast_obstack, NULL);
1941 }