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                         if (designator->range_last) {
 603                                 print_string(" ... ");
 604                                 print_expression(designator->range_last);
 605                         }
 606                         print_char(']');
 607                 } else {
 608                         print_char('.');
 609                         print_string(designator->symbol->string);
 610                 }
 611         }
 612 }
 613
 614 /**
 615  * Prints an offsetof expression.
 616  *
 617  * @param expression   the offset expression
 618  */
 619 static void print_offsetof_expression(const offsetof_expression_t *expression)
 620 {
 621         print_string("__builtin_offsetof(");
 622         print_type(expression->type);
 623         print_char(',');
 624         print_designator(expression->designator);
 625         print_char(')');
 626 }
 627
 628 /**
 629  * Prints a statement expression.
 630  *
 631  * @param expression   the statement expression
 632  */
 633 static void print_statement_expression(const statement_expression_t *expression)
 634 {
 635         print_char('(');
 636         print_statement(expression->statement);
 637         print_char(')');
 638 }
 639
 640 static bool needs_parentheses(expression_t const *const expr, unsigned const top_prec)
 641 {
 642         if (expr->base.parenthesized)
 643                 return true;
 644
 645         if (top_prec > get_expression_precedence(expr->base.kind))
 646                 return true;
 647
 648         if (print_parenthesis && top_prec != PREC_BOTTOM) {
 649                 switch (expr->kind) {
 650                 case EXPR_ENUM_CONSTANT:
 651                 case EXPR_FUNCNAME:
 652                 case EXPR_LITERAL_CASES:
 653                 case EXPR_LITERAL_CHARACTER:
 654                 case EXPR_REFERENCE:
 655                 case EXPR_STRING_LITERAL:
 656                         /* Do not print () around subexpressions consisting of a single token. */
 657                         return false;
 658
 659                 default:
 660                         return true;
 661                 }
 662         }
 663
 664         return false;
 665 }
 666
 667 /**
 668  * Prints an expression with parenthesis if needed.
 669  *
 670  * @param expression  the expression to print
 671  * @param top_prec    the precedence of the user of this expression.
 672  */
 673 static void print_expression_prec(expression_t const *expr, unsigned const top_prec)
 674 {
 675         if (expr->kind == EXPR_UNARY_CAST && expr->base.implicit && !print_implicit_casts) {
 676                 expr = expr->unary.value;
 677         }
 678
 679         bool const parenthesized = needs_parentheses(expr, top_prec);
 680
 681         if (parenthesized)
 682                 print_char('(');
 683         switch (expr->kind) {
 684         case EXPR_ALIGNOF:
 685         case EXPR_SIZEOF:                     print_typeprop_expression(     &expr->typeprop);                 break;
 686         case EXPR_ARRAY_ACCESS:               print_array_expression(        &expr->array_access);             break;
 687         case EXPR_BINARY_CASES:               print_binary_expression(       &expr->binary);                   break;
 688         case EXPR_BUILTIN_CONSTANT_P:         print_builtin_constant(        &expr->builtin_constant);         break;
 689         case EXPR_BUILTIN_TYPES_COMPATIBLE_P: print_builtin_types_compatible(&expr->builtin_types_compatible); break;
 690         case EXPR_CALL:                       print_call_expression(         &expr->call);                     break;
 691         case EXPR_CLASSIFY_TYPE:              print_classify_type_expression(&expr->classify_type);            break;
 692         case EXPR_COMPOUND_LITERAL:           print_compound_literal(        &expr->compound_literal);         break;
 693         case EXPR_CONDITIONAL:                print_conditional(             &expr->conditional);              break;
 694         case EXPR_ERROR:                      print_string("$error$");                                         break;
 695         case EXPR_FUNCNAME:                   print_funcname(                &expr->funcname);                 break;
 696         case EXPR_LABEL_ADDRESS:              print_label_address_expression(&expr->label_address);            break;
 697         case EXPR_LITERAL_CASES:              print_literal(                 &expr->literal);                  break;
 698         case EXPR_LITERAL_CHARACTER:          print_string_literal(          &expr->string_literal, '\'');     break;
 699         case EXPR_OFFSETOF:                   print_offsetof_expression(     &expr->offsetofe);                break;
 700         case EXPR_REFERENCE:
 701         case EXPR_ENUM_CONSTANT:              print_reference_expression(    &expr->reference);                break;
 702         case EXPR_SELECT:                     print_select(                  &expr->select);                   break;
 703         case EXPR_STATEMENT:                  print_statement_expression(    &expr->statement);                break;
 704         case EXPR_STRING_LITERAL:             print_string_literal(          &expr->string_literal, '"');      break;
 705         case EXPR_UNARY_CASES:                print_unary_expression(        &expr->unary);                    break;
 706         case EXPR_VA_ARG:                     print_va_arg(                  &expr->va_arge);                  break;
 707         case EXPR_VA_COPY:                    print_va_copy(                 &expr->va_copye);                 break;
 708         case EXPR_VA_START:                   print_va_start(                &expr->va_starte);                break;
 709         }
 710         if (parenthesized)
 711                 print_char(')');
 712 }
 713
 714 static void print_indented_statement(statement_t const *const stmt)
 715 {
 716         switch (stmt->kind) {
 717         case STATEMENT_LABEL:
 718                 break;
 719
 720         case STATEMENT_CASE_LABEL:
 721                 for (int i = 0; i != case_indent; ++i)
 722                         print_char('\t');
 723                 break;
 724
 725         default:
 726                 print_indent();
 727                 break;
 728         }
 729         print_statement(stmt);
 730 }
 731
 732 /**
 733  * Print an compound statement.
 734  *
 735  * @param block  the compound statement
 736  */
 737 static void print_compound_statement(const compound_statement_t *block)
 738 {
 739         print_string("{\n");
 740         ++indent;
 741
 742         for (statement_t const *stmt = block->statements; stmt; stmt = stmt->base.next) {
 743                 print_indented_statement(stmt);
 744                 print_char('\n');
 745         }
 746
 747         --indent;
 748         print_indent();
 749         print_char('}');
 750 }
 751
 752 /**
 753  * Print a return statement.
 754  *
 755  * @param statement  the return statement
 756  */
 757 static void print_return_statement(const return_statement_t *statement)
 758 {
 759         expression_t const *const val = statement->value;
 760         if (val != NULL) {
 761                 print_string("return ");
 762                 print_expression(val);
 763                 print_char(';');
 764         } else {
 765                 print_string("return;");
 766         }
 767 }
 768
 769 /**
 770  * Print an expression statement.
 771  *
 772  * @param statement  the expression statement
 773  */
 774 static void print_expression_statement(const expression_statement_t *statement)
 775 {
 776         print_expression(statement->expression);
 777         print_char(';');
 778 }
 779
 780 /**
 781  * Print a computed goto statement.
 782  *
 783  * @param statement  the computed goto statement
 784  */
 785 static void print_computed_goto_statement(computed_goto_statement_t const *const stmt)
 786 {
 787         print_string("goto *");
 788         print_expression(stmt->expression);
 789         print_char(';');
 790 }
 791
 792 /**
 793  * Print a goto statement.
 794  *
 795  * @param statement  the goto statement
 796  */
 797 static void print_goto_statement(const goto_statement_t *statement)
 798 {
 799         print_string("goto ");
 800         print_string(statement->label->base.symbol->string);
 801         print_char(';');
 802 }
 803
 804 /**
 805  * Print a label statement.
 806  *
 807  * @param statement  the label statement
 808  */
 809 static void print_label_statement(const label_statement_t *statement)
 810 {
 811         print_format("%s:\n", statement->label->base.symbol->string);
 812         print_indented_statement(statement->statement);
 813 }
 814
 815 static void print_inner_statement(statement_t const *const stmt)
 816 {
 817         if (stmt->kind == STATEMENT_COMPOUND) {
 818                 print_char(' ');
 819                 print_compound_statement(&stmt->compound);
 820         } else {
 821                 print_char('\n');
 822                 ++indent;
 823                 print_indented_statement(stmt);
 824                 --indent;
 825         }
 826 }
 827
 828 static void print_after_inner_statement(statement_t const *const stmt)
 829 {
 830         if (stmt->kind == STATEMENT_COMPOUND) {
 831                 print_char(' ');
 832         } else {
 833                 print_char('\n');
 834                 print_indent();
 835         }
 836 }
 837
 838 /**
 839  * Print an if statement.
 840  *
 841  * @param statement  the if statement
 842  */
 843 static void print_if_statement(const if_statement_t *statement)
 844 {
 845         print_string("if (");
 846         print_expression(statement->condition);
 847         print_char(')');
 848         print_inner_statement(statement->true_statement);
 849
 850         statement_t const *const f = statement->false_statement;
 851         if (f) {
 852                 print_after_inner_statement(statement->true_statement);
 853                 print_string("else");
 854                 if (f->kind == STATEMENT_IF) {
 855                         print_char(' ');
 856                         print_if_statement(&f->ifs);
 857                 } else {
 858                         print_inner_statement(f);
 859                 }
 860         }
 861 }
 862
 863 /**
 864  * Print a switch statement.
 865  *
 866  * @param statement  the switch statement
 867  */
 868 static void print_switch_statement(const switch_statement_t *statement)
 869 {
 870         int const old_case_indent = case_indent;
 871         case_indent = indent;
 872
 873         print_string("switch (");
 874         print_expression(statement->expression);
 875         print_char(')');
 876         print_inner_statement(statement->body);
 877
 878         case_indent = old_case_indent;
 879 }
 880
 881 /**
 882  * Print a case label (including the default label).
 883  *
 884  * @param statement  the case label statement
 885  */
 886 static void print_case_label(const case_label_statement_t *statement)
 887 {
 888         if (statement->expression == NULL) {
 889                 print_string("default:\n");
 890         } else {
 891                 print_string("case ");
 892                 print_expression(statement->expression);
 893                 if (statement->end_range != NULL) {
 894                         print_string(" ... ");
 895                         print_expression(statement->end_range);
 896                 }
 897                 print_string(":\n");
 898         }
 899         print_indented_statement(statement->statement);
 900 }
 901
 902 static void print_typedef(const entity_t *entity)
 903 {
 904         print_string("typedef ");
 905         print_type_ext(entity->typedefe.type, entity->base.symbol, NULL);
 906         print_char(';');
 907 }
 908
 909 /**
 910  * returns true if the entity is a compiler generated one and has no real
 911  * correspondenc in the source file
 912  */
 913 static bool is_generated_entity(const entity_t *entity)
 914 {
 915         if (entity->kind == ENTITY_TYPEDEF)
 916                 return entity->typedefe.builtin;
 917
 918         if (is_declaration(entity))
 919                 return entity->declaration.implicit;
 920
 921         return false;
 922 }
 923
 924 /**
 925  * Print a declaration statement.
 926  *
 927  * @param statement   the statement
 928  */
 929 static void print_declaration_statement(
 930                 const declaration_statement_t *statement)
 931 {
 932         bool first = true;
 933         entity_t *entity = statement->declarations_begin;
 934         if (entity == NULL) {
 935                 print_string("/* empty declaration statement */");
 936                 return;
 937         }
 938
 939         entity_t *const end = statement->declarations_end->base.next;
 940         for (; entity != end; entity = entity->base.next) {
 941                 if (entity->kind == ENTITY_ENUM_VALUE)
 942                         continue;
 943                 if (is_generated_entity(entity))
 944                         continue;
 945
 946                 if (!first) {
 947                         print_char('\n');
 948                         print_indent();
 949                 } else {
 950                         first = false;
 951                 }
 952
 953                 print_entity(entity);
 954         }
 955 }
 956
 957 /**
 958  * Print a do-while statement.
 959  *
 960  * @param statement   the statement
 961  */
 962 static void print_do_while_statement(const do_while_statement_t *statement)
 963 {
 964         print_string("do");
 965         print_inner_statement(statement->body);
 966         print_after_inner_statement(statement->body);
 967         print_string("while (");
 968         print_expression(statement->condition);
 969         print_string(");");
 970 }
 971
 972 /**
 973  * Print a for statement.
 974  *
 975  * @param statement   the statement
 976  */
 977 static void print_for_statement(const for_statement_t *statement)
 978 {
 979         if (statement->initialisation || statement->scope.entities || !statement->condition || statement->step) {
 980                 print_string("for (");
 981                 if (statement->initialisation != NULL) {
 982                         print_expression(statement->initialisation);
 983                         print_char(';');
 984                 } else {
 985                         entity_t const *entity = statement->scope.entities;
 986                         for (; entity != NULL; entity = entity->base.next) {
 987                                 if (is_generated_entity(entity))
 988                                         continue;
 989                                 /* FIXME display of multiple declarations is wrong */
 990                                 print_declaration(entity);
 991                         }
 992                 }
 993                 if (statement->condition != NULL) {
 994                         print_char(' ');
 995                         print_expression(statement->condition);
 996                 }
 997                 print_char(';');
 998                 if (statement->step != NULL) {
 999                         print_char(' ');
1000                         print_expression(statement->step);
1001                 }
1002         } else {
1003                 print_string("while (");
1004                 print_expression(statement->condition);
1005         }
1006         print_char(')');
1007         print_inner_statement(statement->body);
1008 }
1009
1010 /**
1011  * Print assembler arguments.
1012  *
1013  * @param arguments   the arguments
1014  */
1015 static void print_asm_arguments(asm_argument_t const *const arguments)
1016 {
1017         print_string(" :");
1018         separator_t sep = { " ", ", " };
1019         for (asm_argument_t const *i = arguments; i; i = i->next) {
1020                 print_string(sep_next(&sep));
1021                 if (i->symbol)
1022                         print_format("[%s] ", i->symbol->string);
1023                 print_quoted_string(&i->constraints, '"');
1024                 print_string(" (");
1025                 print_expression(i->expression);
1026                 print_char(')');
1027         }
1028 }
1029
1030 /**
1031  * Print assembler clobbers.
1032  *
1033  * @param clobbers   the clobbers
1034  */
1035 static void print_asm_clobbers(asm_clobber_t const *const clobbers)
1036 {
1037         print_string(" :");
1038         separator_t sep = { " ", ", " };
1039         for (asm_clobber_t const *i = clobbers; i; i = i->next) {
1040                 print_string(sep_next(&sep));
1041                 print_quoted_string(&i->clobber, '"');
1042         }
1043 }
1044
1045 static void print_asm_labels(asm_label_t const *const labels)
1046 {
1047         print_string(" :");
1048         separator_t sep = { " ", ", " };
1049         for (asm_label_t const *i = labels; i; i = i->next) {
1050                 print_string(sep_next(&sep));
1051                 print_string(i->label->base.symbol->string);
1052         }
1053 }
1054
1055 /**
1056  * Print an assembler statement.
1057  *
1058  * @param stmt   the statement
1059  */
1060 static void print_asm_statement(asm_statement_t const *const stmt)
1061 {
1062         print_string("asm");
1063         if (stmt->is_volatile) print_string(" volatile");
1064         if (stmt->labels)      print_string(" goto");
1065         print_char('(');
1066         print_quoted_string(&stmt->asm_text, '"');
1067
1068         unsigned const n =
1069                 stmt->labels   ? 4 :
1070                 stmt->clobbers ? 3 :
1071                 stmt->inputs   ? 2 :
1072                 stmt->outputs  ? 1 :
1073                 0;
1074         if (n >= 1) print_asm_arguments(stmt->outputs);
1075         if (n >= 2) print_asm_arguments(stmt->inputs);
1076         if (n >= 3) print_asm_clobbers( stmt->clobbers);
1077         if (n >= 4) print_asm_labels(   stmt->labels);
1078
1079         print_string(");");
1080 }
1081
1082 /**
1083  * Print a microsoft __try statement.
1084  *
1085  * @param statement   the statement
1086  */
1087 static void print_ms_try_statement(const ms_try_statement_t *statement)
1088 {
1089         print_string("__try");
1090         print_inner_statement(statement->try_statement);
1091         print_after_inner_statement(statement->try_statement);
1092         if (statement->except_expression != NULL) {
1093                 print_string("__except(");
1094                 print_expression(statement->except_expression);
1095                 print_char(')');
1096         } else {
1097                 print_string("__finally");
1098         }
1099         print_inner_statement(statement->final_statement);
1100 }
1101
1102 /**
1103  * Print a microsoft __leave statement.
1104  *
1105  * @param statement   the statement
1106  */
1107 static void print_leave_statement(const leave_statement_t *statement)
1108 {
1109         (void)statement;
1110         print_string("__leave;");
1111 }
1112
1113 /**
1114  * Print a statement.
1115  *
1116  * @param statement   the statement
1117  */
1118 void print_statement(statement_t const *const stmt)
1119 {
1120         switch (stmt->kind) {
1121         case STATEMENT_ASM:           print_asm_statement(          &stmt->asms);          break;
1122         case STATEMENT_BREAK:         print_string("break;");                              break;
1123         case STATEMENT_CASE_LABEL:    print_case_label(             &stmt->case_label);    break;
1124         case STATEMENT_COMPOUND:      print_compound_statement(     &stmt->compound);      break;
1125         case STATEMENT_COMPUTED_GOTO: print_computed_goto_statement(&stmt->computed_goto); break;
1126         case STATEMENT_CONTINUE:      print_string("continue;");                           break;
1127         case STATEMENT_DECLARATION:   print_declaration_statement(  &stmt->declaration);   break;
1128         case STATEMENT_DO_WHILE:      print_do_while_statement(     &stmt->do_while);      break;
1129         case STATEMENT_EMPTY:         print_char(';');                                     break;
1130         case STATEMENT_ERROR:         print_string("$error statement$");                   break;
1131         case STATEMENT_EXPRESSION:    print_expression_statement(   &stmt->expression);    break;
1132         case STATEMENT_FOR:           print_for_statement(          &stmt->fors);          break;
1133         case STATEMENT_GOTO:          print_goto_statement(         &stmt->gotos);         break;
1134         case STATEMENT_IF:            print_if_statement(           &stmt->ifs);           break;
1135         case STATEMENT_LABEL:         print_label_statement(        &stmt->label);         break;
1136         case STATEMENT_LEAVE:         print_leave_statement(        &stmt->leave);         break;
1137         case STATEMENT_MS_TRY:        print_ms_try_statement(       &stmt->ms_try);        break;
1138         case STATEMENT_RETURN:        print_return_statement(       &stmt->returns);       break;
1139         case STATEMENT_SWITCH:        print_switch_statement(       &stmt->switchs);       break;
1140         }
1141 }
1142
1143 /**
1144  * Print a storage class.
1145  *
1146  * @param storage_class   the storage class
1147  */
1148 static void print_storage_class(storage_class_tag_t storage_class)
1149 {
1150         switch (storage_class) {
1151         case STORAGE_CLASS_NONE:     return;
1152         case STORAGE_CLASS_TYPEDEF:  print_string("typedef ");  return;
1153         case STORAGE_CLASS_EXTERN:   print_string("extern ");   return;
1154         case STORAGE_CLASS_STATIC:   print_string("static ");   return;
1155         case STORAGE_CLASS_AUTO:     print_string("auto ");     return;
1156         case STORAGE_CLASS_REGISTER: print_string("register "); return;
1157         }
1158         panic("invalid storage class");
1159 }
1160
1161 /**
1162  * Print an initializer.
1163  *
1164  * @param initializer  the initializer
1165  */
1166 void print_initializer(const initializer_t *initializer)
1167 {
1168         if (initializer == NULL) {
1169                 print_string("{}");
1170                 return;
1171         }
1172
1173         switch (initializer->kind) {
1174         case INITIALIZER_STRING:
1175         case INITIALIZER_VALUE:
1176                 print_assignment_expression(initializer->value.value);
1177                 return;
1178
1179         case INITIALIZER_LIST: {
1180                 print_string("{ ");
1181                 const initializer_list_t *list = &initializer->list;
1182
1183                 for (size_t i = 0 ; i < list->len; ++i) {
1184                         const initializer_t *sub_init = list->initializers[i];
1185                         print_initializer(list->initializers[i]);
1186                         if (i < list->len-1) {
1187                                 if (sub_init == NULL || sub_init->kind != INITIALIZER_DESIGNATOR)
1188                                         print_string(", ");
1189                         }
1190                 }
1191                 print_string(" }");
1192                 return;
1193         }
1194
1195         case INITIALIZER_DESIGNATOR:
1196                 print_designator(initializer->designator.designator);
1197                 print_string(" = ");
1198                 return;
1199         }
1200
1201         panic("invalid initializer kind found");
1202 }
1203
1204 #if 0
1205 /**
1206  * Print microsoft extended declaration modifiers.
1207  */
1208 static void print_ms_modifiers(const declaration_t *declaration)
1209 {
1210         if ((c_mode & _MS) == 0)
1211                 return;
1212
1213         decl_modifiers_t modifiers = declaration->modifiers;
1214
1215         separator_t sep = { "__declspec(", ", " };
1216
1217         if (declaration->base.kind == ENTITY_VARIABLE) {
1218                 variable_t *variable = (variable_t*)declaration;
1219                 if (variable->alignment != 0
1220                                 || variable->get_property_sym != NULL
1221                                 || variable->put_property_sym != NULL) {
1222                         if (variable->alignment != 0) {
1223                                 print_format("%salign(%u)", sep_next(&sep), variable->alignment);
1224                         }
1225                         if (variable->get_property_sym != NULL
1226                                         || variable->put_property_sym != NULL) {
1227                                 char *comma = "";
1228                                 print_format("%sproperty(", sep_next(&sep));
1229                                 if (variable->get_property_sym != NULL) {
1230                                         print_format("get=%s", variable->get_property_sym->string);
1231                                         comma = ", ";
1232                                 }
1233                                 if (variable->put_property_sym != NULL)
1234                                         print_format("%sput=%s", comma, variable->put_property_sym->string);
1235                                 print_char(')');
1236                         }
1237                 }
1238         }
1239
1240         /* DM_FORCEINLINE handled outside. */
1241         if ((modifiers & ~DM_FORCEINLINE) != 0) {
1242                 if (modifiers & DM_DLLIMPORT) {
1243                         print_format("%sdllimport", sep_next(&sep));
1244                 }
1245                 if (modifiers & DM_DLLEXPORT) {
1246                         print_format("%sdllexport", sep_next(&sep));
1247                 }
1248                 if (modifiers & DM_THREAD) {
1249                         print_format("%sthread", sep_next(&sep));
1250                 }
1251                 if (modifiers & DM_NAKED) {
1252                         print_format("%snaked", sep_next(&sep));
1253                 }
1254                 if (modifiers & DM_THREAD) {
1255                         print_format("%sthread", sep_next(&sep));
1256                 }
1257                 if (modifiers & DM_SELECTANY) {
1258                         print_format("%sselectany", sep_next(&sep));
1259                 }
1260                 if (modifiers & DM_NOTHROW) {
1261                         print_format("%snothrow", sep_next(&sep));
1262                 }
1263                 if (modifiers & DM_NORETURN) {
1264                         print_format("%snoreturn", sep_next(&sep));
1265                 }
1266                 if (modifiers & DM_NOINLINE) {
1267                         print_format("%snoinline", sep_next(&sep));
1268                 }
1269                 if (modifiers & DM_DEPRECATED) {
1270                         print_format("%sdeprecated", sep_next(&sep));
1271                         if (declaration->deprecated_string != NULL)
1272                                 print_format("(\"%s\")",
1273                                         declaration->deprecated_string);
1274                 }
1275                 if (modifiers & DM_RESTRICT) {
1276                         print_format("%srestrict", sep_next(&sep));
1277                 }
1278                 if (modifiers & DM_NOALIAS) {
1279                         print_format("%snoalias", sep_next(&sep));
1280                 }
1281         }
1282
1283         if (!sep_at_first(&sep))
1284                 print_string(") ");
1285 }
1286 #endif
1287
1288 static void print_scope(const scope_t *scope)
1289 {
1290         const entity_t *entity = scope->entities;
1291         for ( ; entity != NULL; entity = entity->base.next) {
1292                 print_indent();
1293                 print_entity(entity);
1294                 print_char('\n');
1295         }
1296 }
1297
1298 static void print_namespace(const namespace_t *namespace)
1299 {
1300         print_string("namespace ");
1301         if (namespace->base.symbol != NULL) {
1302                 print_string(namespace->base.symbol->string);
1303                 print_char(' ');
1304         }
1305
1306         print_string("{\n");
1307         ++indent;
1308
1309         print_scope(&namespace->members);
1310
1311         --indent;
1312         print_indent();
1313         print_string("}\n");
1314 }
1315
1316 /**
1317  * Print a variable or function declaration
1318  */
1319 void print_declaration(const entity_t *entity)
1320 {
1321         assert(is_declaration(entity));
1322         const declaration_t *declaration = &entity->declaration;
1323
1324         print_storage_class((storage_class_tag_t)declaration->declared_storage_class);
1325         if (entity->kind == ENTITY_FUNCTION) {
1326                 function_t *function = (function_t*)declaration;
1327                 if (function->is_inline) {
1328                         if (declaration->modifiers & DM_FORCEINLINE) {
1329                                 print_string("__forceinline ");
1330                         } else if (declaration->modifiers & DM_MICROSOFT_INLINE) {
1331                                 print_string("__inline ");
1332                         } else {
1333                                 print_string("inline ");
1334                         }
1335                 }
1336         }
1337         //print_ms_modifiers(declaration);
1338         switch (entity->kind) {
1339                 case ENTITY_FUNCTION:
1340                         print_type_ext(entity->declaration.type, entity->base.symbol,
1341                                         &entity->function.parameters);
1342
1343                         if (entity->function.body != NULL) {
1344                                 print_char('\n');
1345                                 print_indented_statement(entity->function.body);
1346                                 print_char('\n');
1347                                 return;
1348                         }
1349                         break;
1350
1351                 case ENTITY_VARIABLE:
1352                         if (entity->variable.thread_local)
1353                                 print_string(c_mode & _C11 ? "_Thread_local " : "__thread ");
1354                         print_type_ext(declaration->type, declaration->base.symbol, NULL);
1355                         if (entity->variable.initializer != NULL) {
1356                                 print_string(" = ");
1357                                 print_initializer(entity->variable.initializer);
1358                         }
1359                         break;
1360
1361                 case ENTITY_COMPOUND_MEMBER:
1362                         print_type_ext(declaration->type, declaration->base.symbol, NULL);
1363                         if (entity->compound_member.bitfield) {
1364                                 print_format(" : %u", entity->compound_member.bit_size);
1365                         }
1366                         break;
1367
1368                 default:
1369                         print_type_ext(declaration->type, declaration->base.symbol, NULL);
1370                         break;
1371         }
1372         print_char(';');
1373 }
1374
1375 /**
1376  * Prints an expression.
1377  *
1378  * @param expression  the expression
1379  */
1380 void print_expression(const expression_t *expression)
1381 {
1382         print_expression_prec(expression, PREC_BOTTOM);
1383 }
1384
1385 /**
1386  * Print a declaration.
1387  *
1388  * @param declaration  the declaration
1389  */
1390 void print_entity(const entity_t *entity)
1391 {
1392         if (entity->base.namespc != NAMESPACE_NORMAL && entity->base.symbol == NULL)
1393                 return;
1394
1395         switch ((entity_kind_tag_t)entity->kind) {
1396         case ENTITY_VARIABLE:
1397         case ENTITY_PARAMETER:
1398         case ENTITY_COMPOUND_MEMBER:
1399         case ENTITY_FUNCTION:
1400                 print_declaration(entity);
1401                 return;
1402         case ENTITY_TYPEDEF:
1403                 print_typedef(entity);
1404                 return;
1405         case ENTITY_CLASS:
1406                 /* TODO */
1407                 print_string("class ");
1408                 print_string(entity->base.symbol->string);
1409                 print_string("; /* TODO */\n");
1410                 return;
1411         case ENTITY_STRUCT:
1412                 print_string("struct ");
1413                 goto print_compound;
1414         case ENTITY_UNION:
1415                 print_string("union ");
1416 print_compound:
1417                 print_string(entity->base.symbol->string);
1418                 if (entity->compound.complete) {
1419                         print_char(' ');
1420                         print_compound_definition(&entity->compound);
1421                 }
1422                 print_char(';');
1423                 return;
1424         case ENTITY_ENUM:
1425                 print_string("enum ");
1426                 print_string(entity->base.symbol->string);
1427                 print_char(' ');
1428                 print_enum_definition(&entity->enume);
1429                 print_char(';');
1430                 return;
1431         case ENTITY_NAMESPACE:
1432                 print_namespace(&entity->namespacee);
1433                 return;
1434         case ENTITY_LOCAL_LABEL:
1435                 print_string("__label__ ");
1436                 print_string(entity->base.symbol->string);
1437                 print_char(';');
1438                 return;
1439         case ENTITY_LABEL:
1440         case ENTITY_ENUM_VALUE:
1441                 panic("print_entity used on unexpected entity type");
1442         }
1443         panic("Invalid entity type encountered");
1444 }
1445
1446 /**
1447  * Print the AST of a translation unit.
1448  *
1449  * @param unit   the translation unit
1450  */
1451 void print_ast(const translation_unit_t *unit)
1452 {
1453         entity_t *entity = unit->scope.entities;
1454         for ( ; entity != NULL; entity = entity->base.next) {
1455                 if (entity->kind == ENTITY_ENUM_VALUE)
1456                         continue;
1457                 if (entity->base.namespc != NAMESPACE_NORMAL
1458                                 && entity->base.symbol == NULL)
1459                         continue;
1460                 if (is_generated_entity(entity))
1461                         continue;
1462
1463                 print_indent();
1464                 print_entity(entity);
1465                 print_char('\n');
1466         }
1467 }
1468
1469 expression_classification_t is_constant_initializer(const initializer_t *initializer)
1470 {
1471         switch (initializer->kind) {
1472         case INITIALIZER_STRING:
1473         case INITIALIZER_DESIGNATOR:
1474                 return EXPR_CLASS_CONSTANT;
1475
1476         case INITIALIZER_VALUE:
1477                 return is_linker_constant(initializer->value.value);
1478
1479         case INITIALIZER_LIST: {
1480                 expression_classification_t all = EXPR_CLASS_CONSTANT;
1481                 for (size_t i = 0; i < initializer->list.len; ++i) {
1482                         initializer_t *sub_initializer = initializer->list.initializers[i];
1483                         expression_classification_t const cur = is_constant_initializer(sub_initializer);
1484                         if (all > cur) {
1485                                 all = cur;
1486                         }
1487                 }
1488                 return all;
1489         }
1490         }
1491         panic("invalid initializer kind found");
1492 }
1493
1494 /**
1495  * Checks if an expression references an object with a constant/known location
1496  * to the linker. Example:
1497  *  - "x", "*&x" with x being a global variable. The value of x need not be
1498  *         constant but the address of x is.
1499  *  - "a.b.c" when a has a constant/known location to the linker
1500  */
1501 static expression_classification_t is_object_with_linker_constant_address(
1502         const expression_t *expression)
1503 {
1504         switch (expression->kind) {
1505         case EXPR_UNARY_DEREFERENCE:
1506                 return is_linker_constant(expression->unary.value);
1507
1508         case EXPR_COMPOUND_LITERAL: {
1509                 const compound_literal_expression_t *literal
1510                         = &expression->compound_literal;
1511                 return literal->global_scope ||
1512                        ((literal->type->base.qualifiers & TYPE_QUALIFIER_CONST)
1513                         && is_constant_initializer(literal->initializer));
1514         }
1515
1516         case EXPR_SELECT: {
1517                 type_t *base_type = skip_typeref(expression->select.compound->base.type);
1518                 if (is_type_pointer(base_type)) {
1519                         /* it's a -> */
1520                         return is_linker_constant(expression->select.compound);
1521                 } else {
1522                         return is_object_with_linker_constant_address(expression->select.compound);
1523                 }
1524         }
1525
1526         case EXPR_ARRAY_ACCESS: {
1527                 expression_classification_t const ref = is_linker_constant(expression->array_access.array_ref);
1528                 expression_classification_t const idx = is_constant_expression(expression->array_access.index);
1529                 return ref < idx ? ref : idx;
1530         }
1531
1532         case EXPR_REFERENCE: {
1533                 entity_t *entity = expression->reference.entity;
1534                 if (!is_declaration(entity))
1535                         return EXPR_CLASS_VARIABLE;
1536
1537                 switch ((storage_class_tag_t)entity->declaration.storage_class) {
1538                 case STORAGE_CLASS_NONE:
1539                 case STORAGE_CLASS_EXTERN:
1540                 case STORAGE_CLASS_STATIC:
1541                         return
1542                                 entity->kind != ENTITY_VARIABLE ||
1543                                 !entity->variable.thread_local ? EXPR_CLASS_CONSTANT :
1544                                 EXPR_CLASS_VARIABLE;
1545
1546                 case STORAGE_CLASS_REGISTER:
1547                 case STORAGE_CLASS_TYPEDEF:
1548                 case STORAGE_CLASS_AUTO:
1549                         break;
1550                 }
1551                 return EXPR_CLASS_VARIABLE;
1552         }
1553
1554         case EXPR_ERROR:
1555                 return EXPR_CLASS_ERROR;
1556
1557         default:
1558                 return EXPR_CLASS_VARIABLE;
1559         }
1560 }
1561
1562 expression_classification_t is_linker_constant(const expression_t *expression)
1563 {
1564         switch (expression->kind) {
1565         case EXPR_STRING_LITERAL:
1566         case EXPR_FUNCNAME:
1567         case EXPR_LABEL_ADDRESS:
1568                 return EXPR_CLASS_CONSTANT;
1569
1570         case EXPR_COMPOUND_LITERAL:
1571                 return is_constant_initializer(expression->compound_literal.initializer);
1572
1573         case EXPR_UNARY_TAKE_ADDRESS:
1574                 return is_object_with_linker_constant_address(expression->unary.value);
1575
1576         case EXPR_UNARY_DEREFERENCE: {
1577                 type_t *real_type
1578                         = revert_automatic_type_conversion(expression->unary.value);
1579                 /* dereferencing a function is a NOP */
1580                 if (is_type_function(real_type)) {
1581                         return is_linker_constant(expression->unary.value);
1582                 }
1583                 /* FALLTHROUGH */
1584         }
1585
1586         case EXPR_UNARY_CAST: {
1587                 type_t *dest = skip_typeref(expression->base.type);
1588                 if (!is_type_pointer(dest) && (
1589                                 dest->kind != TYPE_ATOMIC                                               ||
1590                                 !(get_atomic_type_flags(dest->atomic.akind) & ATOMIC_TYPE_FLAG_INTEGER) ||
1591                                 get_atomic_type_size(dest->atomic.akind) < get_type_size(type_void_ptr)
1592                     ))
1593                         return is_constant_expression(expression);
1594
1595                 return is_linker_constant(expression->unary.value);
1596         }
1597
1598         case EXPR_BINARY_ADD:
1599         case EXPR_BINARY_SUB: {
1600                 expression_t *const left  = expression->binary.left;
1601                 expression_t *const right = expression->binary.right;
1602                 type_t       *const ltype = skip_typeref(left->base.type);
1603                 type_t       *const rtype = skip_typeref(right->base.type);
1604
1605                 if (is_type_pointer(ltype)) {
1606                         expression_classification_t const l = is_linker_constant(left);
1607                         expression_classification_t const r = is_constant_expression(right);
1608                         return l < r ? l : r;
1609                 } else if (is_type_pointer(rtype)) {
1610                         expression_classification_t const l = is_constant_expression(left);
1611                         expression_classification_t const r = is_linker_constant(right);
1612                         return l < r ? l : r;
1613                 } else if (!is_type_valid(ltype) || !is_type_valid(rtype)) {
1614                         return EXPR_CLASS_ERROR;
1615                 } else {
1616                         return is_constant_expression(expression);
1617                 }
1618         }
1619
1620         case EXPR_REFERENCE: {
1621                 entity_t *entity = expression->reference.entity;
1622                 if (!is_declaration(entity))
1623                         return EXPR_CLASS_VARIABLE;
1624
1625                 type_t *type = skip_typeref(entity->declaration.type);
1626                 if (is_type_function(type))
1627                         return EXPR_CLASS_CONSTANT;
1628                 if (is_type_array(type)) {
1629                         return is_object_with_linker_constant_address(expression);
1630                 }
1631                 /* Prevent stray errors */
1632                 if (!is_type_valid(type))
1633                         return EXPR_CLASS_ERROR;
1634                 return EXPR_CLASS_VARIABLE;
1635         }
1636
1637         case EXPR_ARRAY_ACCESS: {
1638                 type_t *const type =
1639                         skip_typeref(revert_automatic_type_conversion(expression));
1640                 if (!is_type_array(type))
1641                         return EXPR_CLASS_VARIABLE;
1642                 return is_linker_constant(expression->array_access.array_ref);
1643         }
1644
1645         case EXPR_CONDITIONAL: {
1646                 expression_t *const c = expression->conditional.condition;
1647                 expression_classification_t const cclass = is_constant_expression(c);
1648                 if (cclass != EXPR_CLASS_CONSTANT)
1649                         return cclass;
1650
1651                 if (fold_constant_to_bool(c)) {
1652                         expression_t const *const t = expression->conditional.true_expression;
1653                         return is_linker_constant(t != NULL ? t : c);
1654                 } else {
1655                         return is_linker_constant(expression->conditional.false_expression);
1656                 }
1657         }
1658
1659         case EXPR_SELECT: {
1660                 entity_t *entity = expression->select.compound_entry;
1661                 if (!is_declaration(entity))
1662                         return EXPR_CLASS_VARIABLE;
1663                 type_t *type = skip_typeref(entity->declaration.type);
1664                 if (is_type_array(type)) {
1665                         /* arrays automatically convert to their address */
1666                         expression_t *compound  = expression->select.compound;
1667                         type_t       *base_type = skip_typeref(compound->base.type);
1668                         if (is_type_pointer(base_type)) {
1669                                 /* it's a -> */
1670                                 return is_linker_constant(compound);
1671                         } else {
1672                                 return is_object_with_linker_constant_address(compound);
1673                         }
1674                 }
1675                 return EXPR_CLASS_VARIABLE;
1676         }
1677
1678         default:
1679                 return is_constant_expression(expression);
1680         }
1681 }
1682
1683 /**
1684  * Check if the given expression is a call to a builtin function
1685  * returning a constant result.
1686  */
1687 static expression_classification_t is_builtin_const_call(const expression_t *expression)
1688 {
1689         expression_t *function = expression->call.function;
1690         if (function->kind != EXPR_REFERENCE)
1691                 return EXPR_CLASS_VARIABLE;
1692         reference_expression_t *ref = &function->reference;
1693         if (ref->entity->kind != ENTITY_FUNCTION)
1694                 return EXPR_CLASS_VARIABLE;
1695
1696         switch (ref->entity->function.btk) {
1697         case BUILTIN_INF:
1698         case BUILTIN_NAN:
1699                 return EXPR_CLASS_CONSTANT;
1700         default:
1701                 return EXPR_CLASS_VARIABLE;
1702         }
1703
1704 }
1705
1706 static expression_classification_t is_constant_pointer(const expression_t *expression)
1707 {
1708         expression_classification_t const expr_class = is_constant_expression(expression);
1709         if (expr_class != EXPR_CLASS_VARIABLE)
1710                 return expr_class;
1711
1712         switch (expression->kind) {
1713         case EXPR_UNARY_CAST:
1714                 return is_constant_pointer(expression->unary.value);
1715         default:
1716                 return EXPR_CLASS_VARIABLE;
1717         }
1718 }
1719
1720 static expression_classification_t is_object_with_constant_address(const expression_t *expression)
1721 {
1722         switch (expression->kind) {
1723         case EXPR_SELECT: {
1724                 expression_t *compound      = expression->select.compound;
1725                 type_t       *compound_type = compound->base.type;
1726                 compound_type = skip_typeref(compound_type);
1727                 if (is_type_pointer(compound_type)) {
1728                         return is_constant_pointer(compound);
1729                 } else {
1730                         return is_object_with_constant_address(compound);
1731                 }
1732         }
1733
1734         case EXPR_ARRAY_ACCESS: {
1735                 array_access_expression_t const* const array_access =
1736                         &expression->array_access;
1737                 expression_classification_t const idx_class = is_constant_expression(array_access->index);
1738                 if (idx_class != EXPR_CLASS_CONSTANT)
1739                         return idx_class;
1740                 expression_classification_t const ref_addr = is_object_with_constant_address(array_access->array_ref);
1741                 expression_classification_t const ref_ptr  = is_constant_pointer(array_access->array_ref);
1742                 return ref_addr > ref_ptr ? ref_addr : ref_ptr;
1743         }
1744
1745         case EXPR_UNARY_DEREFERENCE:
1746                 return is_constant_pointer(expression->unary.value);
1747
1748         case EXPR_ERROR:
1749                 return EXPR_CLASS_ERROR;
1750
1751         default:
1752                 return EXPR_CLASS_VARIABLE;
1753         }
1754 }
1755
1756 expression_classification_t is_constant_expression(const expression_t *expression)
1757 {
1758         switch (expression->kind) {
1759         case EXPR_LITERAL_CHARACTER:
1760         case EXPR_BUILTIN_TYPES_COMPATIBLE_P:
1761         case EXPR_ENUM_CONSTANT:
1762         case EXPR_LITERAL_BOOLEAN:
1763         case EXPR_LITERAL_MS_NOOP:
1764                 return EXPR_CLASS_CONSTANT;
1765
1766         {
1767                 type_t *type;
1768         case EXPR_ALIGNOF:
1769                 type = skip_typeref(expression->typeprop.type);
1770                 goto check_type;
1771
1772         case EXPR_CLASSIFY_TYPE:
1773                 type = skip_typeref(expression->classify_type.type_expression->base.type);
1774                 goto check_type;
1775
1776         case EXPR_LITERAL_INTEGER:
1777         case EXPR_LITERAL_FLOATINGPOINT:
1778                 type = skip_typeref(expression->base.type);
1779                 goto check_type;
1780
1781         case EXPR_OFFSETOF:
1782                 type = skip_typeref(expression->offsetofe.type);
1783                 goto check_type;
1784
1785         case EXPR_SIZEOF:
1786                 type = skip_typeref(expression->typeprop.type);
1787                 if (is_type_array(type) && type->array.is_vla)
1788                         return EXPR_CLASS_VARIABLE;
1789                 goto check_type;
1790
1791 check_type:
1792                 return is_type_valid(type) ? EXPR_CLASS_CONSTANT : EXPR_CLASS_ERROR;
1793         }
1794
1795         case EXPR_BUILTIN_CONSTANT_P: {
1796                 expression_classification_t const c = is_constant_expression(expression->builtin_constant.value);
1797                 return c != EXPR_CLASS_ERROR ? EXPR_CLASS_CONSTANT : EXPR_CLASS_ERROR;
1798         }
1799
1800         case EXPR_STRING_LITERAL:
1801         case EXPR_FUNCNAME:
1802         case EXPR_LABEL_ADDRESS:
1803         case EXPR_SELECT:
1804         case EXPR_VA_START:
1805         case EXPR_VA_ARG:
1806         case EXPR_VA_COPY:
1807         case EXPR_STATEMENT:
1808         case EXPR_UNARY_POSTFIX_INCREMENT:
1809         case EXPR_UNARY_POSTFIX_DECREMENT:
1810         case EXPR_UNARY_PREFIX_INCREMENT:
1811         case EXPR_UNARY_PREFIX_DECREMENT:
1812         case EXPR_UNARY_ASSUME: /* has VOID type */
1813         case EXPR_UNARY_DEREFERENCE:
1814         case EXPR_UNARY_DELETE:
1815         case EXPR_UNARY_DELETE_ARRAY:
1816         case EXPR_UNARY_THROW:
1817         case EXPR_BINARY_ASSIGN:
1818         case EXPR_BINARY_MUL_ASSIGN:
1819         case EXPR_BINARY_DIV_ASSIGN:
1820         case EXPR_BINARY_MOD_ASSIGN:
1821         case EXPR_BINARY_ADD_ASSIGN:
1822         case EXPR_BINARY_SUB_ASSIGN:
1823         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
1824         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
1825         case EXPR_BINARY_BITWISE_AND_ASSIGN:
1826         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
1827         case EXPR_BINARY_BITWISE_OR_ASSIGN:
1828         case EXPR_BINARY_COMMA:
1829         case EXPR_ARRAY_ACCESS:
1830                 return EXPR_CLASS_VARIABLE;
1831
1832         case EXPR_REFERENCE: {
1833                 type_t *const type = skip_typeref(expression->base.type);
1834                 return is_type_valid(type) ? EXPR_CLASS_VARIABLE : EXPR_CLASS_ERROR;
1835         }
1836
1837         case EXPR_UNARY_TAKE_ADDRESS:
1838                 return is_object_with_constant_address(expression->unary.value);
1839
1840         case EXPR_CALL:
1841                 return is_builtin_const_call(expression);
1842
1843         case EXPR_UNARY_NEGATE:
1844         case EXPR_UNARY_PLUS:
1845         case EXPR_UNARY_COMPLEMENT:
1846         case EXPR_UNARY_NOT:
1847                 return is_constant_expression(expression->unary.value);
1848
1849         case EXPR_UNARY_IMAG:
1850         case EXPR_UNARY_REAL: {
1851                 type_t *type = skip_typeref(expression->base.type);
1852                 if (!is_type_valid(type))
1853                         return EXPR_CLASS_ERROR;
1854                 return is_constant_expression(expression->unary.value);
1855         }
1856
1857         case EXPR_UNARY_CAST: {
1858                 type_t *const type = skip_typeref(expression->base.type);
1859                 if (is_type_scalar(type))
1860                         return is_constant_expression(expression->unary.value);
1861                 if (!is_type_valid(type))
1862                         return EXPR_CLASS_ERROR;
1863                 return EXPR_CLASS_VARIABLE;
1864         }
1865
1866         case EXPR_BINARY_ADD:
1867         case EXPR_BINARY_SUB:
1868         case EXPR_BINARY_MUL:
1869         case EXPR_BINARY_DIV:
1870         case EXPR_BINARY_MOD:
1871         case EXPR_BINARY_EQUAL:
1872         case EXPR_BINARY_NOTEQUAL:
1873         case EXPR_BINARY_LESS:
1874         case EXPR_BINARY_LESSEQUAL:
1875         case EXPR_BINARY_GREATER:
1876         case EXPR_BINARY_GREATEREQUAL:
1877         case EXPR_BINARY_BITWISE_AND:
1878         case EXPR_BINARY_BITWISE_OR:
1879         case EXPR_BINARY_BITWISE_XOR:
1880         case EXPR_BINARY_SHIFTLEFT:
1881         case EXPR_BINARY_SHIFTRIGHT:
1882         case EXPR_BINARY_ISGREATER:
1883         case EXPR_BINARY_ISGREATEREQUAL:
1884         case EXPR_BINARY_ISLESS:
1885         case EXPR_BINARY_ISLESSEQUAL:
1886         case EXPR_BINARY_ISLESSGREATER:
1887         case EXPR_BINARY_ISUNORDERED: {
1888                 expression_classification_t const l = is_constant_expression(expression->binary.left);
1889                 expression_classification_t const r = is_constant_expression(expression->binary.right);
1890                 return l < r ? l : r;
1891         }
1892
1893         case EXPR_BINARY_LOGICAL_AND: {
1894                 expression_t const         *const left   = expression->binary.left;
1895                 expression_classification_t const lclass = is_constant_expression(left);
1896                 if (lclass != EXPR_CLASS_CONSTANT)
1897                         return lclass;
1898                 if (!fold_constant_to_bool(left))
1899                         return EXPR_CLASS_CONSTANT;
1900                 return is_constant_expression(expression->binary.right);
1901         }
1902
1903         case EXPR_BINARY_LOGICAL_OR: {
1904                 expression_t const         *const left   = expression->binary.left;
1905                 expression_classification_t const lclass = is_constant_expression(left);
1906                 if (lclass != EXPR_CLASS_CONSTANT)
1907                         return lclass;
1908                 if (fold_constant_to_bool(left))
1909                         return EXPR_CLASS_CONSTANT;
1910                 return is_constant_expression(expression->binary.right);
1911         }
1912
1913         case EXPR_COMPOUND_LITERAL:
1914                 return is_constant_initializer(expression->compound_literal.initializer);
1915
1916         case EXPR_CONDITIONAL: {
1917                 expression_t               *const condition = expression->conditional.condition;
1918                 expression_classification_t const cclass    = is_constant_expression(condition);
1919                 if (cclass != EXPR_CLASS_CONSTANT)
1920                         return cclass;
1921
1922                 if (fold_constant_to_bool(condition)) {
1923                         expression_t const *const t = expression->conditional.true_expression;
1924                         return t == NULL ? EXPR_CLASS_CONSTANT : is_constant_expression(t);
1925                 } else {
1926                         return is_constant_expression(expression->conditional.false_expression);
1927                 }
1928         }
1929
1930         case EXPR_ERROR:
1931                 return EXPR_CLASS_ERROR;
1932         }
1933         panic("invalid expression");
1934 }
1935
1936 void init_ast(void)
1937 {
1938         obstack_init(&ast_obstack);
1939 }
1940
1941 void exit_ast(void)
1942 {
1943         obstack_free(&ast_obstack, NULL);
1944 }