nsz Git - cparser/blob - ast.c

   1 /*
   2  * This file is part of cparser.
   3  * Copyright (C) 2007-2009 Matthias Braun <matze@braunis.de>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  18  * 02111-1307, USA.
  19  */
  20 #include <config.h>
  21
  22 #include "ast_t.h"
  23 #include "symbol_t.h"
  24 #include "type_t.h"
  25 #include "parser.h"
  26 #include "lang_features.h"
  27 #include "entity_t.h"
  28 #include "printer.h"
  29 #include "types.h"
  30
  31 #include <assert.h>
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34 #include <ctype.h>
  35
  36 #if defined(__INTEL_COMPILER)
  37 #include <mathimf.h>
  38 #elif defined(__CYGWIN__)
  39 #include "win32/cygwin_math_ext.h"
  40 #else
  41 #include <math.h>
  42 #endif
  43
  44 #include "adt/error.h"
  45 #include "adt/util.h"
  46
  47 struct obstack ast_obstack;
  48
  49 static int indent;
  50
  51 bool print_implicit_casts = false;
  52 bool print_parenthesis = false;
  53
  54 static void print_statement(const statement_t *statement);
  55 static void print_expression_prec(const expression_t *expression, unsigned prec);
  56
  57 void change_indent(int delta)
  58 {
  59         indent += delta;
  60         assert(indent >= 0);
  61 }
  62
  63 void print_indent(void)
  64 {
  65         for (int i = 0; i < indent; ++i)
  66                 print_string("\t");
  67 }
  68
  69 static void print_stringrep(const string_t *string)
  70 {
  71         for (size_t i = 0; i < string->size; ++i) {
  72                 print_char(string->begin[i]);
  73         }
  74 }
  75
  76 /**
  77  * Returns 1 if a given precedence level has right-to-left
  78  * associativity, else 0.
  79  *
  80  * @param precedence   the operator precedence
  81  */
  82 static int right_to_left(unsigned precedence)
  83 {
  84         switch (precedence) {
  85         case PREC_ASSIGNMENT:
  86         case PREC_CONDITIONAL:
  87         case PREC_UNARY:
  88                 return 1;
  89
  90         default:
  91                 return 0;
  92         }
  93 }
  94
  95 /**
  96  * Return the precedence of an expression given by its kind.
  97  *
  98  * @param kind   the expression kind
  99  */
 100 static unsigned get_expression_precedence(expression_kind_t kind)
 101 {
 102         static const unsigned prec[] = {
 103                 [EXPR_UNKNOWN]                           = PREC_PRIMARY,
 104                 [EXPR_INVALID]                           = PREC_PRIMARY,
 105                 [EXPR_REFERENCE]                         = PREC_PRIMARY,
 106                 [EXPR_REFERENCE_ENUM_VALUE]              = PREC_PRIMARY,
 107                 [EXPR_LITERAL_INTEGER]                   = PREC_PRIMARY,
 108                 [EXPR_LITERAL_INTEGER_OCTAL]             = PREC_PRIMARY,
 109                 [EXPR_LITERAL_INTEGER_HEXADECIMAL]       = PREC_PRIMARY,
 110                 [EXPR_LITERAL_FLOATINGPOINT]             = PREC_PRIMARY,
 111                 [EXPR_LITERAL_FLOATINGPOINT_HEXADECIMAL] = PREC_PRIMARY,
 112                 [EXPR_LITERAL_CHARACTER]                 = PREC_PRIMARY,
 113                 [EXPR_LITERAL_WIDE_CHARACTER]            = PREC_PRIMARY,
 114                 [EXPR_LITERAL_MS_NOOP]                   = PREC_PRIMARY,
 115                 [EXPR_STRING_LITERAL]                    = PREC_PRIMARY,
 116                 [EXPR_WIDE_STRING_LITERAL]               = PREC_PRIMARY,
 117                 [EXPR_COMPOUND_LITERAL]                  = PREC_UNARY,
 118                 [EXPR_CALL]                              = PREC_POSTFIX,
 119                 [EXPR_CONDITIONAL]                       = PREC_CONDITIONAL,
 120                 [EXPR_SELECT]                            = PREC_POSTFIX,
 121                 [EXPR_ARRAY_ACCESS]                      = PREC_POSTFIX,
 122                 [EXPR_SIZEOF]                            = PREC_UNARY,
 123                 [EXPR_CLASSIFY_TYPE]                     = PREC_UNARY,
 124                 [EXPR_ALIGNOF]                           = PREC_UNARY,
 125
 126                 [EXPR_FUNCNAME]                          = PREC_PRIMARY,
 127                 [EXPR_BUILTIN_CONSTANT_P]                = PREC_PRIMARY,
 128                 [EXPR_BUILTIN_TYPES_COMPATIBLE_P]        = PREC_PRIMARY,
 129                 [EXPR_OFFSETOF]                          = PREC_PRIMARY,
 130                 [EXPR_VA_START]                          = PREC_PRIMARY,
 131                 [EXPR_VA_ARG]                            = PREC_PRIMARY,
 132                 [EXPR_VA_COPY]                           = PREC_PRIMARY,
 133                 [EXPR_STATEMENT]                         = PREC_PRIMARY,
 134                 [EXPR_LABEL_ADDRESS]                     = PREC_PRIMARY,
 135
 136                 [EXPR_UNARY_NEGATE]                      = PREC_UNARY,
 137                 [EXPR_UNARY_PLUS]                        = PREC_UNARY,
 138                 [EXPR_UNARY_BITWISE_NEGATE]              = PREC_UNARY,
 139                 [EXPR_UNARY_NOT]                         = PREC_UNARY,
 140                 [EXPR_UNARY_DEREFERENCE]                 = PREC_UNARY,
 141                 [EXPR_UNARY_TAKE_ADDRESS]                = PREC_UNARY,
 142                 [EXPR_UNARY_POSTFIX_INCREMENT]           = PREC_POSTFIX,
 143                 [EXPR_UNARY_POSTFIX_DECREMENT]           = PREC_POSTFIX,
 144                 [EXPR_UNARY_PREFIX_INCREMENT]            = PREC_UNARY,
 145                 [EXPR_UNARY_PREFIX_DECREMENT]            = PREC_UNARY,
 146                 [EXPR_UNARY_CAST]                        = PREC_UNARY,
 147                 [EXPR_UNARY_ASSUME]                      = PREC_PRIMARY,
 148                 [EXPR_UNARY_DELETE]                      = PREC_UNARY,
 149                 [EXPR_UNARY_DELETE_ARRAY]                = PREC_UNARY,
 150                 [EXPR_UNARY_THROW]                       = PREC_ASSIGNMENT,
 151
 152                 [EXPR_BINARY_ADD]                        = PREC_ADDITIVE,
 153                 [EXPR_BINARY_SUB]                        = PREC_ADDITIVE,
 154                 [EXPR_BINARY_MUL]                        = PREC_MULTIPLICATIVE,
 155                 [EXPR_BINARY_DIV]                        = PREC_MULTIPLICATIVE,
 156                 [EXPR_BINARY_MOD]                        = PREC_MULTIPLICATIVE,
 157                 [EXPR_BINARY_EQUAL]                      = PREC_EQUALITY,
 158                 [EXPR_BINARY_NOTEQUAL]                   = PREC_EQUALITY,
 159                 [EXPR_BINARY_LESS]                       = PREC_RELATIONAL,
 160                 [EXPR_BINARY_LESSEQUAL]                  = PREC_RELATIONAL,
 161                 [EXPR_BINARY_GREATER]                    = PREC_RELATIONAL,
 162                 [EXPR_BINARY_GREATEREQUAL]               = PREC_RELATIONAL,
 163                 [EXPR_BINARY_BITWISE_AND]                = PREC_AND,
 164                 [EXPR_BINARY_BITWISE_OR]                 = PREC_OR,
 165                 [EXPR_BINARY_BITWISE_XOR]                = PREC_XOR,
 166                 [EXPR_BINARY_LOGICAL_AND]                = PREC_LOGICAL_AND,
 167                 [EXPR_BINARY_LOGICAL_OR]                 = PREC_LOGICAL_OR,
 168                 [EXPR_BINARY_SHIFTLEFT]                  = PREC_SHIFT,
 169                 [EXPR_BINARY_SHIFTRIGHT]                 = PREC_SHIFT,
 170                 [EXPR_BINARY_ASSIGN]                     = PREC_ASSIGNMENT,
 171                 [EXPR_BINARY_MUL_ASSIGN]                 = PREC_ASSIGNMENT,
 172                 [EXPR_BINARY_DIV_ASSIGN]                 = PREC_ASSIGNMENT,
 173                 [EXPR_BINARY_MOD_ASSIGN]                 = PREC_ASSIGNMENT,
 174                 [EXPR_BINARY_ADD_ASSIGN]                 = PREC_ASSIGNMENT,
 175                 [EXPR_BINARY_SUB_ASSIGN]                 = PREC_ASSIGNMENT,
 176                 [EXPR_BINARY_SHIFTLEFT_ASSIGN]           = PREC_ASSIGNMENT,
 177                 [EXPR_BINARY_SHIFTRIGHT_ASSIGN]          = PREC_ASSIGNMENT,
 178                 [EXPR_BINARY_BITWISE_AND_ASSIGN]         = PREC_ASSIGNMENT,
 179                 [EXPR_BINARY_BITWISE_XOR_ASSIGN]         = PREC_ASSIGNMENT,
 180                 [EXPR_BINARY_BITWISE_OR_ASSIGN]          = PREC_ASSIGNMENT,
 181                 [EXPR_BINARY_COMMA]                      = PREC_EXPRESSION,
 182
 183                 [EXPR_BINARY_ISGREATER]                  = PREC_PRIMARY,
 184                 [EXPR_BINARY_ISGREATEREQUAL]             = PREC_PRIMARY,
 185                 [EXPR_BINARY_ISLESS]                     = PREC_PRIMARY,
 186                 [EXPR_BINARY_ISLESSEQUAL]                = PREC_PRIMARY,
 187                 [EXPR_BINARY_ISLESSGREATER]              = PREC_PRIMARY,
 188                 [EXPR_BINARY_ISUNORDERED]                = PREC_PRIMARY
 189         };
 190         assert((size_t)kind < lengthof(prec));
 191         unsigned res = prec[kind];
 192
 193         assert(res != PREC_BOTTOM);
 194         return res;
 195 }
 196
 197 /**
 198  * Print a quoted string constant.
 199  *
 200  * @param string  the string constant
 201  * @param border  the border char
 202  * @param skip    number of chars to skip at the end
 203  */
 204 static void print_quoted_string(const string_t *const string, char border,
 205                                 int skip)
 206 {
 207         print_char(border);
 208         const char *end = string->begin + string->size - skip;
 209         for (const char *c = string->begin; c != end; ++c) {
 210                 const char tc = *c;
 211                 if (tc == border) {
 212                         print_string("\\");
 213                 }
 214                 switch (tc) {
 215                 case '\\': print_string("\\\\"); break;
 216                 case '\a': print_string("\\a"); break;
 217                 case '\b': print_string("\\b"); break;
 218                 case '\f': print_string("\\f"); break;
 219                 case '\n': print_string("\\n"); break;
 220                 case '\r': print_string("\\r"); break;
 221                 case '\t': print_string("\\t"); break;
 222                 case '\v': print_string("\\v"); break;
 223                 case '\?': print_string("\\?"); break;
 224                 case 27:
 225                         if (c_mode & _GNUC) {
 226                                 print_string("\\e"); break;
 227                         }
 228                         /* FALLTHROUGH */
 229                 default:
 230                         if ((unsigned)tc < 0x80 && !isprint(tc)) {
 231                                 print_format("\\%03o", (unsigned)tc);
 232                         } else {
 233                                 print_char(tc);
 234                         }
 235                         break;
 236                 }
 237         }
 238         print_char(border);
 239 }
 240
 241 static void print_string_literal(const string_literal_expression_t *literal)
 242 {
 243         if (literal->base.kind == EXPR_WIDE_STRING_LITERAL) {
 244                 print_char('L');
 245         }
 246         print_quoted_string(&literal->value, '"', 1);
 247 }
 248
 249 static void print_literal(const literal_expression_t *literal)
 250 {
 251         switch (literal->base.kind) {
 252         case EXPR_LITERAL_MS_NOOP:
 253                 print_string("__noop");
 254                 return;
 255         case EXPR_LITERAL_INTEGER_HEXADECIMAL:
 256         case EXPR_LITERAL_FLOATINGPOINT_HEXADECIMAL:
 257                 print_string("0x");
 258                 /* FALLTHROUGH */
 259         case EXPR_LITERAL_BOOLEAN:
 260         case EXPR_LITERAL_INTEGER:
 261         case EXPR_LITERAL_INTEGER_OCTAL:
 262         case EXPR_LITERAL_FLOATINGPOINT:
 263                 print_stringrep(&literal->value);
 264                 if (literal->suffix.size > 0)
 265                         print_stringrep(&literal->suffix);
 266                 return;
 267         case EXPR_LITERAL_WIDE_CHARACTER:
 268                 print_char('L');
 269                 /* FALLTHROUGH */
 270         case EXPR_LITERAL_CHARACTER:
 271                 print_quoted_string(&literal->value, '\'', 0);
 272                 return;
 273         default:
 274                 break;
 275         }
 276         print_string("INVALID LITERAL KIND");
 277 }
 278
 279 /**
 280  * Prints a predefined symbol.
 281  */
 282 static void print_funcname(const funcname_expression_t *funcname)
 283 {
 284         const char *s = "";
 285         switch (funcname->kind) {
 286         case FUNCNAME_FUNCTION:        s = (c_mode & _C99) ? "__func__" : "__FUNCTION__"; break;
 287         case FUNCNAME_PRETTY_FUNCTION: s = "__PRETTY_FUNCTION__"; break;
 288         case FUNCNAME_FUNCSIG:         s = "__FUNCSIG__"; break;
 289         case FUNCNAME_FUNCDNAME:       s = "__FUNCDNAME__"; break;
 290         }
 291         print_string(s);
 292 }
 293
 294 static void print_compound_literal(
 295                 const compound_literal_expression_t *expression)
 296 {
 297         print_string("(");
 298         print_type(expression->type);
 299         print_string(")");
 300         print_initializer(expression->initializer);
 301 }
 302
 303 static void print_assignment_expression(const expression_t *const expr)
 304 {
 305         print_expression_prec(expr, PREC_ASSIGNMENT);
 306 }
 307
 308 /**
 309  * Prints a call expression.
 310  *
 311  * @param call  the call expression
 312  */
 313 static void print_call_expression(const call_expression_t *call)
 314 {
 315         print_expression_prec(call->function, PREC_POSTFIX);
 316         print_string("(");
 317         call_argument_t *argument = call->arguments;
 318         int              first    = 1;
 319         while (argument != NULL) {
 320                 if (!first) {
 321                         print_string(", ");
 322                 } else {
 323                         first = 0;
 324                 }
 325                 print_assignment_expression(argument->expression);
 326
 327                 argument = argument->next;
 328         }
 329         print_string(")");
 330 }
 331
 332 /**
 333  * Prints a binary expression.
 334  *
 335  * @param binexpr   the binary expression
 336  */
 337 static void print_binary_expression(const binary_expression_t *binexpr)
 338 {
 339         unsigned prec = get_expression_precedence(binexpr->base.kind);
 340         int      r2l  = right_to_left(prec);
 341
 342         print_expression_prec(binexpr->left, prec + r2l);
 343         char const* op;
 344         switch (binexpr->base.kind) {
 345         case EXPR_BINARY_COMMA:              op = ", ";    break;
 346         case EXPR_BINARY_ASSIGN:             op = " = ";   break;
 347         case EXPR_BINARY_ADD:                op = " + ";   break;
 348         case EXPR_BINARY_SUB:                op = " - ";   break;
 349         case EXPR_BINARY_MUL:                op = " * ";   break;
 350         case EXPR_BINARY_MOD:                op = " % ";   break;
 351         case EXPR_BINARY_DIV:                op = " / ";   break;
 352         case EXPR_BINARY_BITWISE_OR:         op = " | ";   break;
 353         case EXPR_BINARY_BITWISE_AND:        op = " & ";   break;
 354         case EXPR_BINARY_BITWISE_XOR:        op = " ^ ";   break;
 355         case EXPR_BINARY_LOGICAL_OR:         op = " || ";  break;
 356         case EXPR_BINARY_LOGICAL_AND:        op = " && ";  break;
 357         case EXPR_BINARY_NOTEQUAL:           op = " != ";  break;
 358         case EXPR_BINARY_EQUAL:              op = " == ";  break;
 359         case EXPR_BINARY_LESS:               op = " < ";   break;
 360         case EXPR_BINARY_LESSEQUAL:          op = " <= ";  break;
 361         case EXPR_BINARY_GREATER:            op = " > ";   break;
 362         case EXPR_BINARY_GREATEREQUAL:       op = " >= ";  break;
 363         case EXPR_BINARY_SHIFTLEFT:          op = " << ";  break;
 364         case EXPR_BINARY_SHIFTRIGHT:         op = " >> ";  break;
 365
 366         case EXPR_BINARY_ADD_ASSIGN:         op = " += ";  break;
 367         case EXPR_BINARY_SUB_ASSIGN:         op = " -= ";  break;
 368         case EXPR_BINARY_MUL_ASSIGN:         op = " *= ";  break;
 369         case EXPR_BINARY_MOD_ASSIGN:         op = " %= ";  break;
 370         case EXPR_BINARY_DIV_ASSIGN:         op = " /= ";  break;
 371         case EXPR_BINARY_BITWISE_OR_ASSIGN:  op = " |= ";  break;
 372         case EXPR_BINARY_BITWISE_AND_ASSIGN: op = " &= ";  break;
 373         case EXPR_BINARY_BITWISE_XOR_ASSIGN: op = " ^= ";  break;
 374         case EXPR_BINARY_SHIFTLEFT_ASSIGN:   op = " <<= "; break;
 375         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:  op = " >>= "; break;
 376         default: panic("invalid binexpression found");
 377         }
 378         print_string(op);
 379         print_expression_prec(binexpr->right, prec + 1 - r2l);
 380 }
 381
 382 /**
 383  * Prints an unary expression.
 384  *
 385  * @param unexpr   the unary expression
 386  */
 387 static void print_unary_expression(const unary_expression_t *unexpr)
 388 {
 389         unsigned prec = get_expression_precedence(unexpr->base.kind);
 390         switch (unexpr->base.kind) {
 391         case EXPR_UNARY_NEGATE:           print_string("-"); break;
 392         case EXPR_UNARY_PLUS:             print_string("+"); break;
 393         case EXPR_UNARY_NOT:              print_string("!"); break;
 394         case EXPR_UNARY_BITWISE_NEGATE:   print_string("~"); break;
 395         case EXPR_UNARY_PREFIX_INCREMENT: print_string("++"); break;
 396         case EXPR_UNARY_PREFIX_DECREMENT: print_string("--"); break;
 397         case EXPR_UNARY_DEREFERENCE:      print_string("*"); break;
 398         case EXPR_UNARY_TAKE_ADDRESS:     print_string("&"); break;
 399         case EXPR_UNARY_DELETE:           print_string("delete "); break;
 400         case EXPR_UNARY_DELETE_ARRAY:     print_string("delete [] "); break;
 401
 402         case EXPR_UNARY_POSTFIX_INCREMENT:
 403                 print_expression_prec(unexpr->value, prec);
 404                 print_string("++");
 405                 return;
 406         case EXPR_UNARY_POSTFIX_DECREMENT:
 407                 print_expression_prec(unexpr->value, prec);
 408                 print_string("--");
 409                 return;
 410         case EXPR_UNARY_CAST:
 411                 print_string("(");
 412                 print_type(unexpr->base.type);
 413                 print_string(")");
 414                 break;
 415         case EXPR_UNARY_ASSUME:
 416                 print_string("__assume(");
 417                 print_assignment_expression(unexpr->value);
 418                 print_string(")");
 419                 return;
 420
 421         case EXPR_UNARY_THROW:
 422                 if (unexpr->value == NULL) {
 423                         print_string("throw");
 424                         return;
 425                 }
 426                 print_string("throw ");
 427                 break;
 428
 429         default:
 430                 panic("invalid unary expression found");
 431         }
 432         print_expression_prec(unexpr->value, prec);
 433 }
 434
 435 /**
 436  * Prints a reference expression.
 437  *
 438  * @param ref   the reference expression
 439  */
 440 static void print_reference_expression(const reference_expression_t *ref)
 441 {
 442         print_string(ref->entity->base.symbol->string);
 443 }
 444
 445 /**
 446  * Prints a label address expression.
 447  *
 448  * @param ref   the reference expression
 449  */
 450 static void print_label_address_expression(const label_address_expression_t *le)
 451 {
 452         print_format("&&%s", le->label->base.symbol->string);
 453 }
 454
 455 /**
 456  * Prints an array expression.
 457  *
 458  * @param expression   the array expression
 459  */
 460 static void print_array_expression(const array_access_expression_t *expression)
 461 {
 462         if (!expression->flipped) {
 463                 print_expression_prec(expression->array_ref, PREC_POSTFIX);
 464                 print_string("[");
 465                 print_expression(expression->index);
 466                 print_string("]");
 467         } else {
 468                 print_expression_prec(expression->index, PREC_POSTFIX);
 469                 print_string("[");
 470                 print_expression(expression->array_ref);
 471                 print_string("]");
 472         }
 473 }
 474
 475 /**
 476  * Prints a typeproperty expression (sizeof or __alignof__).
 477  *
 478  * @param expression   the type property expression
 479  */
 480 static void print_typeprop_expression(const typeprop_expression_t *expression)
 481 {
 482         if (expression->base.kind == EXPR_SIZEOF) {
 483                 print_string("sizeof");
 484         } else {
 485                 assert(expression->base.kind == EXPR_ALIGNOF);
 486                 print_string("__alignof__");
 487         }
 488         if (expression->tp_expression != NULL) {
 489                 /* PREC_TOP: always print the '()' here, sizeof x is right but unusual */
 490                 print_expression_prec(expression->tp_expression, PREC_TOP);
 491         } else {
 492                 print_string("(");
 493                 print_type(expression->type);
 494                 print_string(")");
 495         }
 496 }
 497
 498 /**
 499  * Prints a builtin constant expression.
 500  *
 501  * @param expression   the builtin constant expression
 502  */
 503 static void print_builtin_constant(const builtin_constant_expression_t *expression)
 504 {
 505         print_string("__builtin_constant_p(");
 506         print_assignment_expression(expression->value);
 507         print_string(")");
 508 }
 509
 510 /**
 511  * Prints a builtin types compatible expression.
 512  *
 513  * @param expression   the builtin types compatible expression
 514  */
 515 static void print_builtin_types_compatible(
 516                 const builtin_types_compatible_expression_t *expression)
 517 {
 518         print_string("__builtin_types_compatible_p(");
 519         print_type(expression->left);
 520         print_string(", ");
 521         print_type(expression->right);
 522         print_string(")");
 523 }
 524
 525 /**
 526  * Prints a conditional expression.
 527  *
 528  * @param expression   the conditional expression
 529  */
 530 static void print_conditional(const conditional_expression_t *expression)
 531 {
 532         print_expression_prec(expression->condition, PREC_LOGICAL_OR);
 533         if (expression->true_expression != NULL) {
 534                 print_string(" ? ");
 535                 print_expression_prec(expression->true_expression, PREC_EXPRESSION);
 536                 print_string(" : ");
 537         } else {
 538                 print_string(" ?: ");
 539         }
 540         precedence_t prec = c_mode & _CXX ? PREC_ASSIGNMENT : PREC_CONDITIONAL;
 541         print_expression_prec(expression->false_expression, prec);
 542 }
 543
 544 /**
 545  * Prints a va_start expression.
 546  *
 547  * @param expression   the va_start expression
 548  */
 549 static void print_va_start(const va_start_expression_t *const expression)
 550 {
 551         print_string("__builtin_va_start(");
 552         print_assignment_expression(expression->ap);
 553         print_string(", ");
 554         print_string(expression->parameter->base.base.symbol->string);
 555         print_string(")");
 556 }
 557
 558 /**
 559  * Prints a va_arg expression.
 560  *
 561  * @param expression   the va_arg expression
 562  */
 563 static void print_va_arg(const va_arg_expression_t *expression)
 564 {
 565         print_string("__builtin_va_arg(");
 566         print_assignment_expression(expression->ap);
 567         print_string(", ");
 568         print_type(expression->base.type);
 569         print_string(")");
 570 }
 571
 572 /**
 573  * Prints a va_copy expression.
 574  *
 575  * @param expression   the va_copy expression
 576  */
 577 static void print_va_copy(const va_copy_expression_t *expression)
 578 {
 579         print_string("__builtin_va_copy(");
 580         print_assignment_expression(expression->dst);
 581         print_string(", ");
 582         print_assignment_expression(expression->src);
 583         print_string(")");
 584 }
 585
 586 /**
 587  * Prints a select expression (. or ->).
 588  *
 589  * @param expression   the select expression
 590  */
 591 static void print_select(const select_expression_t *expression)
 592 {
 593         print_expression_prec(expression->compound, PREC_POSTFIX);
 594         if (is_type_pointer(skip_typeref(expression->compound->base.type))) {
 595                 print_string("->");
 596         } else {
 597                 print_string(".");
 598         }
 599         print_string(expression->compound_entry->base.symbol->string);
 600 }
 601
 602 /**
 603  * Prints a type classify expression.
 604  *
 605  * @param expr   the type classify expression
 606  */
 607 static void print_classify_type_expression(
 608         const classify_type_expression_t *const expr)
 609 {
 610         print_string("__builtin_classify_type(");
 611         print_assignment_expression(expr->type_expression);
 612         print_string(")");
 613 }
 614
 615 /**
 616  * Prints a designator.
 617  *
 618  * @param designator  the designator
 619  */
 620 static void print_designator(const designator_t *designator)
 621 {
 622         for ( ; designator != NULL; designator = designator->next) {
 623                 if (designator->symbol == NULL) {
 624                         print_string("[");
 625                         print_expression(designator->array_index);
 626                         print_string("]");
 627                 } else {
 628                         print_string(".");
 629                         print_string(designator->symbol->string);
 630                 }
 631         }
 632 }
 633
 634 /**
 635  * Prints an offsetof expression.
 636  *
 637  * @param expression   the offset expression
 638  */
 639 static void print_offsetof_expression(const offsetof_expression_t *expression)
 640 {
 641         print_string("__builtin_offsetof(");
 642         print_type(expression->type);
 643         print_string(",");
 644         print_designator(expression->designator);
 645         print_string(")");
 646 }
 647
 648 /**
 649  * Prints a statement expression.
 650  *
 651  * @param expression   the statement expression
 652  */
 653 static void print_statement_expression(const statement_expression_t *expression)
 654 {
 655         print_string("(");
 656         print_statement(expression->statement);
 657         print_string(")");
 658 }
 659
 660 /**
 661  * Prints an expression with parenthesis if needed.
 662  *
 663  * @param expression  the expression to print
 664  * @param top_prec    the precedence of the user of this expression.
 665  */
 666 static void print_expression_prec(const expression_t *expression, unsigned top_prec)
 667 {
 668         if (expression->kind == EXPR_UNARY_CAST
 669             && expression->base.implicit && !print_implicit_casts) {
 670                 expression = expression->unary.value;
 671         }
 672
 673         bool parenthesized =
 674                 expression->base.parenthesized                 ||
 675                 (print_parenthesis && top_prec != PREC_BOTTOM) ||
 676                 top_prec > get_expression_precedence(expression->base.kind);
 677
 678         if (parenthesized)
 679                 print_string("(");
 680         switch (expression->kind) {
 681         case EXPR_UNKNOWN:
 682         case EXPR_INVALID:
 683                 print_string("$invalid expression$");
 684                 break;
 685         case EXPR_WIDE_STRING_LITERAL:
 686         case EXPR_STRING_LITERAL:
 687                 print_string_literal(&expression->string_literal);
 688                 break;
 689         EXPR_LITERAL_CASES
 690                 print_literal(&expression->literal);
 691                 break;
 692         case EXPR_FUNCNAME:
 693                 print_funcname(&expression->funcname);
 694                 break;
 695         case EXPR_COMPOUND_LITERAL:
 696                 print_compound_literal(&expression->compound_literal);
 697                 break;
 698         case EXPR_CALL:
 699                 print_call_expression(&expression->call);
 700                 break;
 701         EXPR_BINARY_CASES
 702                 print_binary_expression(&expression->binary);
 703                 break;
 704         case EXPR_REFERENCE:
 705         case EXPR_REFERENCE_ENUM_VALUE:
 706                 print_reference_expression(&expression->reference);
 707                 break;
 708         case EXPR_ARRAY_ACCESS:
 709                 print_array_expression(&expression->array_access);
 710                 break;
 711         case EXPR_LABEL_ADDRESS:
 712                 print_label_address_expression(&expression->label_address);
 713                 break;
 714         EXPR_UNARY_CASES
 715                 print_unary_expression(&expression->unary);
 716                 break;
 717         case EXPR_SIZEOF:
 718         case EXPR_ALIGNOF:
 719                 print_typeprop_expression(&expression->typeprop);
 720                 break;
 721         case EXPR_BUILTIN_CONSTANT_P:
 722                 print_builtin_constant(&expression->builtin_constant);
 723                 break;
 724         case EXPR_BUILTIN_TYPES_COMPATIBLE_P:
 725                 print_builtin_types_compatible(&expression->builtin_types_compatible);
 726                 break;
 727         case EXPR_CONDITIONAL:
 728                 print_conditional(&expression->conditional);
 729                 break;
 730         case EXPR_VA_START:
 731                 print_va_start(&expression->va_starte);
 732                 break;
 733         case EXPR_VA_ARG:
 734                 print_va_arg(&expression->va_arge);
 735                 break;
 736         case EXPR_VA_COPY:
 737                 print_va_copy(&expression->va_copye);
 738                 break;
 739         case EXPR_SELECT:
 740                 print_select(&expression->select);
 741                 break;
 742         case EXPR_CLASSIFY_TYPE:
 743                 print_classify_type_expression(&expression->classify_type);
 744                 break;
 745         case EXPR_OFFSETOF:
 746                 print_offsetof_expression(&expression->offsetofe);
 747                 break;
 748         case EXPR_STATEMENT:
 749                 print_statement_expression(&expression->statement);
 750                 break;
 751
 752 #if 0
 753         default:
 754                 /* TODO */
 755                 print_format("some expression of type %d", (int)expression->kind);
 756                 break;
 757 #endif
 758         }
 759         if (parenthesized)
 760                 print_string(")");
 761 }
 762
 763 /**
 764  * Print an compound statement.
 765  *
 766  * @param block  the compound statement
 767  */
 768 static void print_compound_statement(const compound_statement_t *block)
 769 {
 770         print_string("{\n");
 771         ++indent;
 772
 773         statement_t *statement = block->statements;
 774         while (statement != NULL) {
 775                 if (statement->base.kind == STATEMENT_CASE_LABEL)
 776                         --indent;
 777                 if (statement->kind != STATEMENT_LABEL)
 778                         print_indent();
 779                 print_statement(statement);
 780
 781                 statement = statement->base.next;
 782         }
 783         --indent;
 784         print_indent();
 785         print_string(block->stmt_expr ? "}" : "}\n");
 786 }
 787
 788 /**
 789  * Print a return statement.
 790  *
 791  * @param statement  the return statement
 792  */
 793 static void print_return_statement(const return_statement_t *statement)
 794 {
 795         expression_t const *const val = statement->value;
 796         if (val != NULL) {
 797                 print_string("return ");
 798                 print_expression(val);
 799                 print_string(";\n");
 800         } else {
 801                 print_string("return;\n");
 802         }
 803 }
 804
 805 /**
 806  * Print an expression statement.
 807  *
 808  * @param statement  the expression statement
 809  */
 810 static void print_expression_statement(const expression_statement_t *statement)
 811 {
 812         print_expression(statement->expression);
 813         print_string(";\n");
 814 }
 815
 816 /**
 817  * Print a goto statement.
 818  *
 819  * @param statement  the goto statement
 820  */
 821 static void print_goto_statement(const goto_statement_t *statement)
 822 {
 823         print_string("goto ");
 824         if (statement->expression != NULL) {
 825                 print_string("*");
 826                 print_expression(statement->expression);
 827         } else {
 828                 print_string(statement->label->base.symbol->string);
 829         }
 830         print_string(";\n");
 831 }
 832
 833 /**
 834  * Print a label statement.
 835  *
 836  * @param statement  the label statement
 837  */
 838 static void print_label_statement(const label_statement_t *statement)
 839 {
 840         print_format("%s:\n", statement->label->base.symbol->string);
 841         print_indent();
 842         print_statement(statement->statement);
 843 }
 844
 845 /**
 846  * Print an if statement.
 847  *
 848  * @param statement  the if statement
 849  */
 850 static void print_if_statement(const if_statement_t *statement)
 851 {
 852         print_string("if (");
 853         print_expression(statement->condition);
 854         print_string(") ");
 855         print_statement(statement->true_statement);
 856
 857         if (statement->false_statement != NULL) {
 858                 print_indent();
 859                 print_string("else ");
 860                 print_statement(statement->false_statement);
 861         }
 862 }
 863
 864 /**
 865  * Print a switch statement.
 866  *
 867  * @param statement  the switch statement
 868  */
 869 static void print_switch_statement(const switch_statement_t *statement)
 870 {
 871         print_string("switch (");
 872         print_expression(statement->expression);
 873         print_string(") ");
 874         print_statement(statement->body);
 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         ++indent;
 896         if (statement->statement != NULL) {
 897                 if (statement->statement->base.kind == STATEMENT_CASE_LABEL) {
 898                         --indent;
 899                 }
 900                 print_indent();
 901                 print_statement(statement->statement);
 902         }
 903 }
 904
 905 static void print_typedef(const entity_t *entity)
 906 {
 907         print_string("typedef ");
 908         print_type_ext(entity->typedefe.type, entity->base.symbol, NULL);
 909         print_string(";");
 910 }
 911
 912 /**
 913  * returns true if the entity is a compiler generated one and has no real
 914  * correspondenc in the source file
 915  */
 916 static bool is_generated_entity(const entity_t *entity)
 917 {
 918         if (entity->kind == ENTITY_TYPEDEF)
 919                 return entity->typedefe.builtin;
 920
 921         if (is_declaration(entity))
 922                 return entity->declaration.implicit;
 923
 924         return false;
 925 }
 926
 927 /**
 928  * Print a declaration statement.
 929  *
 930  * @param statement   the statement
 931  */
 932 static void print_declaration_statement(
 933                 const declaration_statement_t *statement)
 934 {
 935         bool first = true;
 936         entity_t *entity = statement->declarations_begin;
 937         if (entity == NULL) {
 938                 print_string("/* empty declaration statement */\n");
 939                 return;
 940         }
 941
 942         entity_t *const end = statement->declarations_end->base.next;
 943         for (; entity != end; entity = entity->base.next) {
 944                 if (entity->kind == ENTITY_ENUM_VALUE)
 945                         continue;
 946                 if (is_generated_entity(entity))
 947                         continue;
 948
 949                 if (!first) {
 950                         print_indent();
 951                 } else {
 952                         first = false;
 953                 }
 954
 955                 print_entity(entity);
 956                 print_string("\n");
 957         }
 958 }
 959
 960 /**
 961  * Print a while statement.
 962  *
 963  * @param statement   the statement
 964  */
 965 static void print_while_statement(const while_statement_t *statement)
 966 {
 967         print_string("while (");
 968         print_expression(statement->condition);
 969         print_string(") ");
 970         print_statement(statement->body);
 971 }
 972
 973 /**
 974  * Print a do-while statement.
 975  *
 976  * @param statement   the statement
 977  */
 978 static void print_do_while_statement(const do_while_statement_t *statement)
 979 {
 980         print_string("do ");
 981         print_statement(statement->body);
 982         print_indent();
 983         print_string("while (");
 984         print_expression(statement->condition);
 985         print_string(");\n");
 986 }
 987
 988 /**
 989  * Print a for statement.
 990  *
 991  * @param statement   the statement
 992  */
 993 static void print_for_statement(const for_statement_t *statement)
 994 {
 995         print_string("for (");
 996         if (statement->initialisation != NULL) {
 997                 print_expression(statement->initialisation);
 998                 print_string(";");
 999         } else {
1000                 entity_t const *entity = statement->scope.entities;
1001                 for (; entity != NULL; entity = entity->base.next) {
1002                         if (is_generated_entity(entity))
1003                                 continue;
1004                         /* FIXME display of multiple declarations is wrong */
1005                         print_declaration(entity);
1006                 }
1007         }
1008         if (statement->condition != NULL) {
1009                 print_string(" ");
1010                 print_expression(statement->condition);
1011         }
1012         print_string(";");
1013         if (statement->step != NULL) {
1014                 print_string(" ");
1015                 print_expression(statement->step);
1016         }
1017         print_string(") ");
1018         print_statement(statement->body);
1019 }
1020
1021 /**
1022  * Print assembler arguments.
1023  *
1024  * @param arguments   the arguments
1025  */
1026 static void print_asm_arguments(asm_argument_t *arguments)
1027 {
1028         asm_argument_t *argument = arguments;
1029         for (; argument != NULL; argument = argument->next) {
1030                 if (argument != arguments)
1031                         print_string(", ");
1032
1033                 if (argument->symbol) {
1034                         print_format("[%s] ", argument->symbol->string);
1035                 }
1036                 print_quoted_string(&argument->constraints, '"', 1);
1037                 print_string(" (");
1038                 print_expression(argument->expression);
1039                 print_string(")");
1040         }
1041 }
1042
1043 /**
1044  * Print assembler clobbers.
1045  *
1046  * @param clobbers   the clobbers
1047  */
1048 static void print_asm_clobbers(asm_clobber_t *clobbers)
1049 {
1050         asm_clobber_t *clobber = clobbers;
1051         for (; clobber != NULL; clobber = clobber->next) {
1052                 if (clobber != clobbers)
1053                         print_string(", ");
1054
1055                 print_quoted_string(&clobber->clobber, '"', 1);
1056         }
1057 }
1058
1059 /**
1060  * Print an assembler statement.
1061  *
1062  * @param statement   the statement
1063  */
1064 static void print_asm_statement(const asm_statement_t *statement)
1065 {
1066         print_string("asm ");
1067         if (statement->is_volatile) {
1068                 print_string("volatile ");
1069         }
1070         print_string("(");
1071         print_quoted_string(&statement->asm_text, '"', 1);
1072         if (statement->outputs  == NULL &&
1073             statement->inputs   == NULL &&
1074             statement->clobbers == NULL)
1075                 goto end_of_print_asm_statement;
1076
1077         print_string(" : ");
1078         print_asm_arguments(statement->outputs);
1079         if (statement->inputs == NULL && statement->clobbers == NULL)
1080                 goto end_of_print_asm_statement;
1081
1082         print_string(" : ");
1083         print_asm_arguments(statement->inputs);
1084         if (statement->clobbers == NULL)
1085                 goto end_of_print_asm_statement;
1086
1087         print_string(" : ");
1088         print_asm_clobbers(statement->clobbers);
1089
1090 end_of_print_asm_statement:
1091         print_string(");\n");
1092 }
1093
1094 /**
1095  * Print a microsoft __try statement.
1096  *
1097  * @param statement   the statement
1098  */
1099 static void print_ms_try_statement(const ms_try_statement_t *statement)
1100 {
1101         print_string("__try ");
1102         print_statement(statement->try_statement);
1103         print_indent();
1104         if (statement->except_expression != NULL) {
1105                 print_string("__except(");
1106                 print_expression(statement->except_expression);
1107                 print_string(") ");
1108         } else {
1109                 print_string("__finally ");
1110         }
1111         print_statement(statement->final_statement);
1112 }
1113
1114 /**
1115  * Print a microsoft __leave statement.
1116  *
1117  * @param statement   the statement
1118  */
1119 static void print_leave_statement(const leave_statement_t *statement)
1120 {
1121         (void)statement;
1122         print_string("__leave;\n");
1123 }
1124
1125 /**
1126  * Print a statement.
1127  *
1128  * @param statement   the statement
1129  */
1130 void print_statement(const statement_t *statement)
1131 {
1132         switch (statement->kind) {
1133         case STATEMENT_EMPTY:
1134                 print_string(";\n");
1135                 break;
1136         case STATEMENT_COMPOUND:
1137                 print_compound_statement(&statement->compound);
1138                 break;
1139         case STATEMENT_RETURN:
1140                 print_return_statement(&statement->returns);
1141                 break;
1142         case STATEMENT_EXPRESSION:
1143                 print_expression_statement(&statement->expression);
1144                 break;
1145         case STATEMENT_LABEL:
1146                 print_label_statement(&statement->label);
1147                 break;
1148         case STATEMENT_GOTO:
1149                 print_goto_statement(&statement->gotos);
1150                 break;
1151         case STATEMENT_CONTINUE:
1152                 print_string("continue;\n");
1153                 break;
1154         case STATEMENT_BREAK:
1155                 print_string("break;\n");
1156                 break;
1157         case STATEMENT_IF:
1158                 print_if_statement(&statement->ifs);
1159                 break;
1160         case STATEMENT_SWITCH:
1161                 print_switch_statement(&statement->switchs);
1162                 break;
1163         case STATEMENT_CASE_LABEL:
1164                 print_case_label(&statement->case_label);
1165                 break;
1166         case STATEMENT_DECLARATION:
1167                 print_declaration_statement(&statement->declaration);
1168                 break;
1169         case STATEMENT_WHILE:
1170                 print_while_statement(&statement->whiles);
1171                 break;
1172         case STATEMENT_DO_WHILE:
1173                 print_do_while_statement(&statement->do_while);
1174                 break;
1175         case STATEMENT_FOR:
1176                 print_for_statement(&statement->fors);
1177                 break;
1178         case STATEMENT_ASM:
1179                 print_asm_statement(&statement->asms);
1180                 break;
1181         case STATEMENT_MS_TRY:
1182                 print_ms_try_statement(&statement->ms_try);
1183                 break;
1184         case STATEMENT_LEAVE:
1185                 print_leave_statement(&statement->leave);
1186                 break;
1187         case STATEMENT_INVALID:
1188                 print_string("$invalid statement$\n");
1189                 break;
1190         }
1191 }
1192
1193 /**
1194  * Print a storage class.
1195  *
1196  * @param storage_class   the storage class
1197  */
1198 static void print_storage_class(storage_class_tag_t storage_class)
1199 {
1200         switch (storage_class) {
1201         case STORAGE_CLASS_NONE:     return;
1202         case STORAGE_CLASS_TYPEDEF:  print_string("typedef ");  return;
1203         case STORAGE_CLASS_EXTERN:   print_string("extern ");   return;
1204         case STORAGE_CLASS_STATIC:   print_string("static ");   return;
1205         case STORAGE_CLASS_AUTO:     print_string("auto ");     return;
1206         case STORAGE_CLASS_REGISTER: print_string("register "); return;
1207         }
1208         panic("invalid storage class");
1209 }
1210
1211 /**
1212  * Print an initializer.
1213  *
1214  * @param initializer  the initializer
1215  */
1216 void print_initializer(const initializer_t *initializer)
1217 {
1218         if (initializer == NULL) {
1219                 print_string("{}");
1220                 return;
1221         }
1222
1223         switch (initializer->kind) {
1224         case INITIALIZER_VALUE: {
1225                 const initializer_value_t *value = &initializer->value;
1226                 print_assignment_expression(value->value);
1227                 return;
1228         }
1229         case INITIALIZER_LIST: {
1230                 assert(initializer->kind == INITIALIZER_LIST);
1231                 print_string("{ ");
1232                 const initializer_list_t *list = &initializer->list;
1233
1234                 for (size_t i = 0 ; i < list->len; ++i) {
1235                         const initializer_t *sub_init = list->initializers[i];
1236                         print_initializer(list->initializers[i]);
1237                         if (i < list->len-1) {
1238                                 if (sub_init == NULL || sub_init->kind != INITIALIZER_DESIGNATOR)
1239                                         print_string(", ");
1240                         }
1241                 }
1242                 print_string(" }");
1243                 return;
1244         }
1245         case INITIALIZER_STRING:
1246                 print_quoted_string(&initializer->string.string, '"', 1);
1247                 return;
1248         case INITIALIZER_WIDE_STRING:
1249                 print_quoted_string(&initializer->string.string, '"', 1);
1250                 return;
1251         case INITIALIZER_DESIGNATOR:
1252                 print_designator(initializer->designator.designator);
1253                 print_string(" = ");
1254                 return;
1255         }
1256
1257         panic("invalid initializer kind found");
1258 }
1259
1260 #if 0
1261 /**
1262  * Print microsoft extended declaration modifiers.
1263  */
1264 static void print_ms_modifiers(const declaration_t *declaration)
1265 {
1266         if ((c_mode & _MS) == 0)
1267                 return;
1268
1269         decl_modifiers_t modifiers = declaration->modifiers;
1270
1271         bool        ds_shown = false;
1272         const char *next     = "(";
1273
1274         if (declaration->base.kind == ENTITY_VARIABLE) {
1275                 variable_t *variable = (variable_t*)declaration;
1276                 if (variable->alignment != 0
1277                                 || variable->get_property_sym != NULL
1278                                 || variable->put_property_sym != NULL) {
1279                         if (!ds_shown) {
1280                                 print_string("__declspec");
1281                                 ds_shown = true;
1282                         }
1283
1284                         if (variable->alignment != 0) {
1285                                 print_string(next); next = ", "; print_format("align(%u)", variable->alignment);
1286                         }
1287                         if (variable->get_property_sym != NULL
1288                                         || variable->put_property_sym != NULL) {
1289                                 char *comma = "";
1290                                 print_string(next); next = ", "; print_string("property(");
1291                                 if (variable->get_property_sym != NULL) {
1292                                         print_format("get=%s", variable->get_property_sym->string);
1293                                         comma = ", ";
1294                                 }
1295                                 if (variable->put_property_sym != NULL)
1296                                         print_format("%sput=%s", comma, variable->put_property_sym->string);
1297                                 print_string(")");
1298                         }
1299                 }
1300         }
1301
1302         /* DM_FORCEINLINE handled outside. */
1303         if ((modifiers & ~DM_FORCEINLINE) != 0) {
1304                 if (!ds_shown) {
1305                         print_string("__declspec");
1306                         ds_shown = true;
1307                 }
1308                 if (modifiers & DM_DLLIMPORT) {
1309                         print_string(next); next = ", "; print_string("dllimport");
1310                 }
1311                 if (modifiers & DM_DLLEXPORT) {
1312                         print_string(next); next = ", "; print_string("dllexport");
1313                 }
1314                 if (modifiers & DM_THREAD) {
1315                         print_string(next); next = ", "; print_string("thread");
1316                 }
1317                 if (modifiers & DM_NAKED) {
1318                         print_string(next); next = ", "; print_string("naked");
1319                 }
1320                 if (modifiers & DM_THREAD) {
1321                         print_string(next); next = ", "; print_string("thread");
1322                 }
1323                 if (modifiers & DM_SELECTANY) {
1324                         print_string(next); next = ", "; print_string("selectany");
1325                 }
1326                 if (modifiers & DM_NOTHROW) {
1327                         print_string(next); next = ", "; print_string("nothrow");
1328                 }
1329                 if (modifiers & DM_NORETURN) {
1330                         print_string(next); next = ", "; print_string("noreturn");
1331                 }
1332                 if (modifiers & DM_NOINLINE) {
1333                         print_string(next); next = ", "; print_string("noinline");
1334                 }
1335                 if (modifiers & DM_DEPRECATED) {
1336                         print_string(next); next = ", "; print_string("deprecated");
1337                         if (declaration->deprecated_string != NULL)
1338                                 print_format("(\"%s\")",
1339                                         declaration->deprecated_string);
1340                 }
1341                 if (modifiers & DM_RESTRICT) {
1342                         print_string(next); next = ", "; print_string("restrict");
1343                 }
1344                 if (modifiers & DM_NOALIAS) {
1345                         print_string(next); next = ", "; print_string("noalias");
1346                 }
1347         }
1348
1349         if (ds_shown)
1350                 print_string(") ");
1351 }
1352 #endif
1353
1354 static void print_scope(const scope_t *scope)
1355 {
1356         const entity_t *entity = scope->entities;
1357         for ( ; entity != NULL; entity = entity->base.next) {
1358                 print_indent();
1359                 print_entity(entity);
1360                 print_string("\n");
1361         }
1362 }
1363
1364 static void print_namespace(const namespace_t *namespace)
1365 {
1366         print_string("namespace ");
1367         if (namespace->base.symbol != NULL) {
1368                 print_string(namespace->base.symbol->string);
1369                 print_string(" ");
1370         }
1371
1372         print_string("{\n");
1373         ++indent;
1374
1375         print_scope(&namespace->members);
1376
1377         --indent;
1378         print_indent();
1379         print_string("}\n");
1380 }
1381
1382 /**
1383  * Print a variable or function declaration
1384  */
1385 void print_declaration(const entity_t *entity)
1386 {
1387         assert(is_declaration(entity));
1388         const declaration_t *declaration = &entity->declaration;
1389
1390         print_storage_class((storage_class_tag_t)declaration->declared_storage_class);
1391         if (entity->kind == ENTITY_FUNCTION) {
1392                 function_t *function = (function_t*)declaration;
1393                 if (function->is_inline) {
1394                         if (declaration->modifiers & DM_FORCEINLINE) {
1395                                 print_string("__forceinline ");
1396                         } else if (declaration->modifiers & DM_MICROSOFT_INLINE) {
1397                                 print_string("__inline ");
1398                         } else {
1399                                 print_string("inline ");
1400                         }
1401                 }
1402         }
1403         //print_ms_modifiers(declaration);
1404         switch (entity->kind) {
1405                 case ENTITY_FUNCTION:
1406                         print_type_ext(entity->declaration.type, entity->base.symbol,
1407                                         &entity->function.parameters);
1408
1409                         if (entity->function.statement != NULL) {
1410                                 print_string("\n");
1411                                 print_indent();
1412                                 print_statement(entity->function.statement);
1413                                 return;
1414                         }
1415                         break;
1416
1417                 case ENTITY_VARIABLE:
1418                         if (entity->variable.thread_local)
1419                                 print_string("__thread ");
1420                         print_type_ext(declaration->type, declaration->base.symbol, NULL);
1421                         if (entity->variable.initializer != NULL) {
1422                                 print_string(" = ");
1423                                 print_initializer(entity->variable.initializer);
1424                         }
1425                         break;
1426
1427                 case ENTITY_COMPOUND_MEMBER:
1428                         print_type_ext(declaration->type, declaration->base.symbol, NULL);
1429                         if (entity->compound_member.bitfield) {
1430                                 print_format(" : %u", entity->compound_member.bit_size);
1431                         }
1432                         break;
1433
1434                 default:
1435                         print_type_ext(declaration->type, declaration->base.symbol, NULL);
1436                         break;
1437         }
1438         print_string(";");
1439 }
1440
1441 /**
1442  * Prints an expression.
1443  *
1444  * @param expression  the expression
1445  */
1446 void print_expression(const expression_t *expression)
1447 {
1448         print_expression_prec(expression, PREC_BOTTOM);
1449 }
1450
1451 /**
1452  * Print a declaration.
1453  *
1454  * @param declaration  the declaration
1455  */
1456 void print_entity(const entity_t *entity)
1457 {
1458         if (entity->base.namespc != NAMESPACE_NORMAL && entity->base.symbol == NULL)
1459                 return;
1460
1461         switch ((entity_kind_tag_t)entity->kind) {
1462         case ENTITY_VARIABLE:
1463         case ENTITY_PARAMETER:
1464         case ENTITY_COMPOUND_MEMBER:
1465         case ENTITY_FUNCTION:
1466                 print_declaration(entity);
1467                 return;
1468         case ENTITY_TYPEDEF:
1469                 print_typedef(entity);
1470                 return;
1471         case ENTITY_CLASS:
1472                 /* TODO */
1473                 print_string("class ");
1474                 print_string(entity->base.symbol->string);
1475                 print_string("; /* TODO */\n");
1476                 return;
1477         case ENTITY_STRUCT:
1478                 print_string("struct ");
1479                 goto print_compound;
1480         case ENTITY_UNION:
1481                 print_string("union ");
1482 print_compound:
1483                 print_string(entity->base.symbol->string);
1484                 if (entity->compound.complete) {
1485                         print_string(" ");
1486                         print_compound_definition(&entity->compound);
1487                 }
1488                 print_string(";");
1489                 return;
1490         case ENTITY_ENUM:
1491                 print_string("enum ");
1492                 print_string(entity->base.symbol->string);
1493                 print_string(" ");
1494                 print_enum_definition(&entity->enume);
1495                 print_string(";");
1496                 return;
1497         case ENTITY_NAMESPACE:
1498                 print_namespace(&entity->namespacee);
1499                 return;
1500         case ENTITY_LOCAL_LABEL:
1501                 print_string("__label__ ");
1502                 print_string(entity->base.symbol->string);
1503                 print_string(";");
1504                 return;
1505         case ENTITY_LABEL:
1506         case ENTITY_ENUM_VALUE:
1507                 panic("print_entity used on unexpected entity type");
1508         case ENTITY_INVALID:
1509                 break;
1510         }
1511         panic("Invalid entity type encountered");
1512 }
1513
1514 /**
1515  * Print the AST of a translation unit.
1516  *
1517  * @param unit   the translation unit
1518  */
1519 void print_ast(const translation_unit_t *unit)
1520 {
1521         entity_t *entity = unit->scope.entities;
1522         for ( ; entity != NULL; entity = entity->base.next) {
1523                 if (entity->kind == ENTITY_ENUM_VALUE)
1524                         continue;
1525                 if (entity->base.namespc != NAMESPACE_NORMAL
1526                                 && entity->base.symbol == NULL)
1527                         continue;
1528                 if (is_generated_entity(entity))
1529                         continue;
1530
1531                 print_indent();
1532                 print_entity(entity);
1533                 print_string("\n");
1534         }
1535 }
1536
1537 expression_classification_t is_constant_initializer(const initializer_t *initializer)
1538 {
1539         switch (initializer->kind) {
1540         case INITIALIZER_STRING:
1541         case INITIALIZER_WIDE_STRING:
1542         case INITIALIZER_DESIGNATOR:
1543                 return EXPR_CLASS_CONSTANT;
1544
1545         case INITIALIZER_VALUE:
1546                 return is_constant_expression(initializer->value.value);
1547
1548         case INITIALIZER_LIST: {
1549                 expression_classification_t all = EXPR_CLASS_CONSTANT;
1550                 for (size_t i = 0; i < initializer->list.len; ++i) {
1551                         initializer_t *sub_initializer = initializer->list.initializers[i];
1552                         expression_classification_t const cur = is_constant_initializer(sub_initializer);
1553                         if (all > cur) {
1554                                 all = cur;
1555                         }
1556                 }
1557                 return all;
1558         }
1559         }
1560         panic("invalid initializer kind found");
1561 }
1562
1563 /**
1564  * Checks if an expression references an object with a constant/known location
1565  * to the linker. Example:
1566  *  - "x", "*&x" with x being a global variable. The value of x need not be
1567  *         constant but the address of x is.
1568  *  - "a.b.c" when a has a constant/known location to the linker
1569  */
1570 static expression_classification_t is_object_with_linker_constant_address(
1571         const expression_t *expression)
1572 {
1573         switch (expression->kind) {
1574         case EXPR_UNARY_DEREFERENCE:
1575                 return is_linker_constant(expression->unary.value);
1576
1577         case EXPR_SELECT: {
1578                 type_t *base_type = skip_typeref(expression->select.compound->base.type);
1579                 if (is_type_pointer(base_type)) {
1580                         /* it's a -> */
1581                         return is_linker_constant(expression->select.compound);
1582                 } else {
1583                         return is_object_with_linker_constant_address(expression->select.compound);
1584                 }
1585         }
1586
1587         case EXPR_ARRAY_ACCESS: {
1588                 expression_classification_t const ref = is_linker_constant(expression->array_access.array_ref);
1589                 expression_classification_t const idx = is_constant_expression(expression->array_access.index);
1590                 return ref < idx ? ref : idx;
1591         }
1592
1593         case EXPR_REFERENCE: {
1594                 entity_t *entity = expression->reference.entity;
1595                 if (!is_declaration(entity))
1596                         return EXPR_CLASS_VARIABLE;
1597
1598                 switch ((storage_class_tag_t)entity->declaration.storage_class) {
1599                 case STORAGE_CLASS_NONE:
1600                 case STORAGE_CLASS_EXTERN:
1601                 case STORAGE_CLASS_STATIC:
1602                         return
1603                                 entity->kind != ENTITY_VARIABLE ||
1604                                 !entity->variable.thread_local ? EXPR_CLASS_CONSTANT :
1605                                 EXPR_CLASS_VARIABLE;
1606
1607                 case STORAGE_CLASS_REGISTER:
1608                 case STORAGE_CLASS_TYPEDEF:
1609                 case STORAGE_CLASS_AUTO:
1610                         break;
1611                 }
1612                 return EXPR_CLASS_VARIABLE;
1613         }
1614
1615         case EXPR_INVALID:
1616                 return EXPR_CLASS_ERROR;
1617
1618         default:
1619                 return EXPR_CLASS_VARIABLE;
1620         }
1621 }
1622
1623 expression_classification_t is_linker_constant(const expression_t *expression)
1624 {
1625         switch (expression->kind) {
1626         case EXPR_STRING_LITERAL:
1627         case EXPR_WIDE_STRING_LITERAL:
1628         case EXPR_FUNCNAME:
1629         case EXPR_LABEL_ADDRESS:
1630                 return EXPR_CLASS_CONSTANT;
1631
1632         case EXPR_UNARY_TAKE_ADDRESS:
1633                 return is_object_with_linker_constant_address(expression->unary.value);
1634
1635         case EXPR_UNARY_DEREFERENCE: {
1636                 type_t *real_type
1637                         = revert_automatic_type_conversion(expression->unary.value);
1638                 /* dereferencing a function is a NOP */
1639                 if (is_type_function(real_type)) {
1640                         return is_linker_constant(expression->unary.value);
1641                 }
1642                 /* FALLTHROUGH */
1643         }
1644
1645         case EXPR_UNARY_CAST: {
1646                 type_t *dest = skip_typeref(expression->base.type);
1647                 if (!is_type_pointer(dest) && (
1648                                 dest->kind != TYPE_ATOMIC                                               ||
1649                                 !(get_atomic_type_flags(dest->atomic.akind) & ATOMIC_TYPE_FLAG_INTEGER) ||
1650                                 get_atomic_type_size(dest->atomic.akind) < get_atomic_type_size(get_intptr_kind())
1651                     ))
1652                         return EXPR_CLASS_VARIABLE;
1653
1654                 expression_classification_t const expr = is_constant_expression(expression->unary.value);
1655                 expression_classification_t const addr = is_linker_constant(expression->unary.value);
1656                 return expr > addr ? expr : addr;
1657         }
1658
1659         case EXPR_BINARY_ADD:
1660         case EXPR_BINARY_SUB: {
1661                 expression_t *const left  = expression->binary.left;
1662                 expression_t *const right = expression->binary.right;
1663                 type_t       *const ltype = skip_typeref(left->base.type);
1664                 type_t       *const rtype = skip_typeref(right->base.type);
1665
1666                 if (is_type_pointer(ltype)) {
1667                         expression_classification_t const l = is_linker_constant(left);
1668                         expression_classification_t const r = is_constant_expression(right);
1669                         return l < r ? l : r;
1670                 } else if (is_type_pointer(rtype)) {
1671                         expression_classification_t const l = is_constant_expression(left);
1672                         expression_classification_t const r = is_linker_constant(right);
1673                         return l < r ? l : r;
1674                 } else if (!is_type_valid(ltype) || !is_type_valid(rtype)) {
1675                         return EXPR_CLASS_ERROR;
1676                 } else {
1677                         return EXPR_CLASS_VARIABLE;
1678                 }
1679         }
1680
1681         case EXPR_REFERENCE: {
1682                 entity_t *entity = expression->reference.entity;
1683                 if (!is_declaration(entity))
1684                         return EXPR_CLASS_VARIABLE;
1685
1686                 type_t *type = skip_typeref(entity->declaration.type);
1687                 if (is_type_function(type))
1688                         return EXPR_CLASS_CONSTANT;
1689                 if (is_type_array(type)) {
1690                         return is_object_with_linker_constant_address(expression);
1691                 }
1692                 /* Prevent stray errors */
1693                 if (!is_type_valid(type))
1694                         return EXPR_CLASS_ERROR;
1695                 return EXPR_CLASS_VARIABLE;
1696         }
1697
1698         case EXPR_ARRAY_ACCESS: {
1699                 type_t *const type =
1700                         skip_typeref(revert_automatic_type_conversion(expression));
1701                 if (!is_type_array(type))
1702                         return EXPR_CLASS_VARIABLE;
1703                 expression_classification_t const ref = is_linker_constant(expression->array_access.array_ref);
1704                 expression_classification_t const idx = is_constant_expression(expression->array_access.index);
1705                 return ref < idx ? ref : idx;
1706         }
1707
1708         case EXPR_CONDITIONAL: {
1709                 expression_t *const c = expression->conditional.condition;
1710                 expression_classification_t const cclass = is_constant_expression(c);
1711                 if (cclass != EXPR_CLASS_CONSTANT)
1712                         return cclass;
1713
1714                 if (fold_constant_to_bool(c)) {
1715                         expression_t const *const t = expression->conditional.true_expression;
1716                         return is_linker_constant(t != NULL ? t : c);
1717                 } else {
1718                         return is_linker_constant(expression->conditional.false_expression);
1719                 }
1720         }
1721
1722         case EXPR_SELECT: {
1723                 entity_t *entity = expression->select.compound_entry;
1724                 if (!is_declaration(entity))
1725                         return EXPR_CLASS_VARIABLE;
1726                 type_t *type = skip_typeref(entity->declaration.type);
1727                 if (is_type_array(type)) {
1728                         /* arrays automatically convert to their address */
1729                         expression_t *compound  = expression->select.compound;
1730                         type_t       *base_type = skip_typeref(compound->base.type);
1731                         if (is_type_pointer(base_type)) {
1732                                 /* it's a -> */
1733                                 return is_linker_constant(compound);
1734                         } else {
1735                                 return is_object_with_linker_constant_address(compound);
1736                         }
1737                 }
1738                 return EXPR_CLASS_VARIABLE;
1739         }
1740
1741         case EXPR_INVALID:
1742                 return EXPR_CLASS_ERROR;
1743
1744         default:
1745                 return EXPR_CLASS_VARIABLE;
1746         }
1747 }
1748
1749 /**
1750  * Check if the given expression is a call to a builtin function
1751  * returning a constant result.
1752  */
1753 static expression_classification_t is_builtin_const_call(const expression_t *expression)
1754 {
1755         expression_t *function = expression->call.function;
1756         if (function->kind != EXPR_REFERENCE)
1757                 return EXPR_CLASS_VARIABLE;
1758         reference_expression_t *ref = &function->reference;
1759         if (ref->entity->kind != ENTITY_FUNCTION)
1760                 return EXPR_CLASS_VARIABLE;
1761
1762         switch (ref->entity->function.btk) {
1763         case bk_gnu_builtin_huge_val:
1764         case bk_gnu_builtin_huge_valf:
1765         case bk_gnu_builtin_huge_vall:
1766         case bk_gnu_builtin_inf:
1767         case bk_gnu_builtin_inff:
1768         case bk_gnu_builtin_infl:
1769         case bk_gnu_builtin_nan:
1770         case bk_gnu_builtin_nanf:
1771         case bk_gnu_builtin_nanl:
1772                 return EXPR_CLASS_CONSTANT;
1773         default:
1774                 return EXPR_CLASS_VARIABLE;
1775         }
1776
1777 }
1778
1779 static expression_classification_t is_constant_pointer(const expression_t *expression)
1780 {
1781         expression_classification_t const expr_class = is_constant_expression(expression);
1782         if (expr_class != EXPR_CLASS_VARIABLE)
1783                 return expr_class;
1784
1785         switch (expression->kind) {
1786         case EXPR_UNARY_CAST:
1787                 return is_constant_pointer(expression->unary.value);
1788         default:
1789                 return EXPR_CLASS_VARIABLE;
1790         }
1791 }
1792
1793 static expression_classification_t is_object_with_constant_address(const expression_t *expression)
1794 {
1795         switch (expression->kind) {
1796         case EXPR_SELECT: {
1797                 expression_t *compound      = expression->select.compound;
1798                 type_t       *compound_type = compound->base.type;
1799                 compound_type = skip_typeref(compound_type);
1800                 if (is_type_pointer(compound_type)) {
1801                         return is_constant_pointer(compound);
1802                 } else {
1803                         return is_object_with_constant_address(compound);
1804                 }
1805         }
1806
1807         case EXPR_ARRAY_ACCESS: {
1808                 array_access_expression_t const* const array_access =
1809                         &expression->array_access;
1810                 expression_classification_t const idx_class = is_constant_expression(array_access->index);
1811                 if (idx_class != EXPR_CLASS_CONSTANT)
1812                         return idx_class;
1813                 expression_classification_t const ref_addr = is_object_with_constant_address(array_access->array_ref);
1814                 expression_classification_t const ref_ptr  = is_constant_pointer(array_access->array_ref);
1815                 return ref_addr > ref_ptr ? ref_addr : ref_ptr;
1816         }
1817
1818         case EXPR_UNARY_DEREFERENCE:
1819                 return is_constant_pointer(expression->unary.value);
1820
1821         case EXPR_INVALID:
1822                 return EXPR_CLASS_ERROR;
1823
1824         default:
1825                 return EXPR_CLASS_VARIABLE;
1826         }
1827 }
1828
1829 expression_classification_t is_constant_expression(const expression_t *expression)
1830 {
1831         switch (expression->kind) {
1832         EXPR_LITERAL_CASES
1833         case EXPR_CLASSIFY_TYPE:
1834         case EXPR_OFFSETOF:
1835         case EXPR_ALIGNOF:
1836         case EXPR_BUILTIN_CONSTANT_P:
1837         case EXPR_BUILTIN_TYPES_COMPATIBLE_P:
1838         case EXPR_REFERENCE_ENUM_VALUE:
1839                 return EXPR_CLASS_CONSTANT;
1840
1841         case EXPR_SIZEOF: {
1842                 type_t *const type = skip_typeref(expression->typeprop.type);
1843                 return
1844                         !is_type_array(type) || !type->array.is_vla ? EXPR_CLASS_CONSTANT :
1845                         EXPR_CLASS_VARIABLE;
1846         }
1847
1848         case EXPR_STRING_LITERAL:
1849         case EXPR_WIDE_STRING_LITERAL:
1850         case EXPR_FUNCNAME:
1851         case EXPR_LABEL_ADDRESS:
1852         case EXPR_SELECT:
1853         case EXPR_VA_START:
1854         case EXPR_VA_ARG:
1855         case EXPR_VA_COPY:
1856         case EXPR_STATEMENT:
1857         case EXPR_UNARY_POSTFIX_INCREMENT:
1858         case EXPR_UNARY_POSTFIX_DECREMENT:
1859         case EXPR_UNARY_PREFIX_INCREMENT:
1860         case EXPR_UNARY_PREFIX_DECREMENT:
1861         case EXPR_UNARY_ASSUME: /* has VOID type */
1862         case EXPR_UNARY_DEREFERENCE:
1863         case EXPR_UNARY_DELETE:
1864         case EXPR_UNARY_DELETE_ARRAY:
1865         case EXPR_UNARY_THROW:
1866         case EXPR_BINARY_ASSIGN:
1867         case EXPR_BINARY_MUL_ASSIGN:
1868         case EXPR_BINARY_DIV_ASSIGN:
1869         case EXPR_BINARY_MOD_ASSIGN:
1870         case EXPR_BINARY_ADD_ASSIGN:
1871         case EXPR_BINARY_SUB_ASSIGN:
1872         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
1873         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
1874         case EXPR_BINARY_BITWISE_AND_ASSIGN:
1875         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
1876         case EXPR_BINARY_BITWISE_OR_ASSIGN:
1877         case EXPR_BINARY_COMMA:
1878         case EXPR_ARRAY_ACCESS:
1879                 return EXPR_CLASS_VARIABLE;
1880
1881         case EXPR_REFERENCE: {
1882                 type_t *const type = skip_typeref(expression->base.type);
1883                 return is_type_valid(type) ? EXPR_CLASS_VARIABLE : EXPR_CLASS_ERROR;
1884         }
1885
1886         case EXPR_UNARY_TAKE_ADDRESS:
1887                 return is_object_with_constant_address(expression->unary.value);
1888
1889         case EXPR_CALL:
1890                 return is_builtin_const_call(expression);
1891
1892         case EXPR_UNARY_NEGATE:
1893         case EXPR_UNARY_PLUS:
1894         case EXPR_UNARY_BITWISE_NEGATE:
1895         case EXPR_UNARY_NOT:
1896                 return is_constant_expression(expression->unary.value);
1897
1898         case EXPR_UNARY_CAST: {
1899                 type_t *const type = skip_typeref(expression->base.type);
1900                 if (is_type_scalar(type))
1901                         return is_constant_expression(expression->unary.value);
1902                 if (!is_type_valid(type))
1903                         return EXPR_CLASS_ERROR;
1904                 return EXPR_CLASS_VARIABLE;
1905         }
1906
1907         case EXPR_BINARY_ADD:
1908         case EXPR_BINARY_SUB:
1909         case EXPR_BINARY_MUL:
1910         case EXPR_BINARY_DIV:
1911         case EXPR_BINARY_MOD:
1912         case EXPR_BINARY_EQUAL:
1913         case EXPR_BINARY_NOTEQUAL:
1914         case EXPR_BINARY_LESS:
1915         case EXPR_BINARY_LESSEQUAL:
1916         case EXPR_BINARY_GREATER:
1917         case EXPR_BINARY_GREATEREQUAL:
1918         case EXPR_BINARY_BITWISE_AND:
1919         case EXPR_BINARY_BITWISE_OR:
1920         case EXPR_BINARY_BITWISE_XOR:
1921         case EXPR_BINARY_SHIFTLEFT:
1922         case EXPR_BINARY_SHIFTRIGHT:
1923         case EXPR_BINARY_ISGREATER:
1924         case EXPR_BINARY_ISGREATEREQUAL:
1925         case EXPR_BINARY_ISLESS:
1926         case EXPR_BINARY_ISLESSEQUAL:
1927         case EXPR_BINARY_ISLESSGREATER:
1928         case EXPR_BINARY_ISUNORDERED: {
1929                 expression_classification_t const l = is_constant_expression(expression->binary.left);
1930                 expression_classification_t const r = is_constant_expression(expression->binary.right);
1931                 return l < r ? l : r;
1932         }
1933
1934         case EXPR_BINARY_LOGICAL_AND: {
1935                 expression_t const         *const left   = expression->binary.left;
1936                 expression_classification_t const lclass = is_constant_expression(left);
1937                 if (lclass != EXPR_CLASS_CONSTANT)
1938                         return lclass;
1939                 if (!fold_constant_to_bool(left))
1940                         return EXPR_CLASS_CONSTANT;
1941                 return is_constant_expression(expression->binary.right);
1942         }
1943
1944         case EXPR_BINARY_LOGICAL_OR: {
1945                 expression_t const         *const left   = expression->binary.left;
1946                 expression_classification_t const lclass = is_constant_expression(left);
1947                 if (lclass != EXPR_CLASS_CONSTANT)
1948                         return lclass;
1949                 if (fold_constant_to_bool(left))
1950                         return EXPR_CLASS_CONSTANT;
1951                 return is_constant_expression(expression->binary.right);
1952         }
1953
1954         case EXPR_COMPOUND_LITERAL:
1955                 return is_constant_initializer(expression->compound_literal.initializer);
1956
1957         case EXPR_CONDITIONAL: {
1958                 expression_t               *const condition = expression->conditional.condition;
1959                 expression_classification_t const cclass    = is_constant_expression(condition);
1960                 if (cclass != EXPR_CLASS_CONSTANT)
1961                         return cclass;
1962
1963                 if (fold_constant_to_bool(condition)) {
1964                         expression_t const *const t = expression->conditional.true_expression;
1965                         return t == NULL ? EXPR_CLASS_CONSTANT : is_constant_expression(t);
1966                 } else {
1967                         return is_constant_expression(expression->conditional.false_expression);
1968                 }
1969         }
1970
1971         case EXPR_INVALID:
1972                 return EXPR_CLASS_ERROR;
1973
1974         case EXPR_UNKNOWN:
1975                 break;
1976         }
1977         panic("invalid expression found (is constant expression)");
1978 }
1979
1980 void init_ast(void)
1981 {
1982         obstack_init(&ast_obstack);
1983 }
1984
1985 void exit_ast(void)
1986 {
1987         obstack_free(&ast_obstack, NULL);
1988 }