nsz Git - cparser/blob - ast.c

   1 #include <config.h>
   2
   3 #include "ast_t.h"
   4 #include "type_t.h"
   5
   6 #include <assert.h>
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include <ctype.h>
  10
  11 #include "adt/error.h"
  12
  13 struct obstack ast_obstack;
  14
  15 static FILE *out;
  16 static int   indent;
  17
  18 /** If set, implicit casts are printed. */
  19 bool print_implicit_casts = false;
  20
  21 /** If set parenthesis are printed to indicate operator precedence. */
  22 bool print_parenthesis = false;
  23
  24 static void print_statement(const statement_t *statement);
  25 static void print_expression_prec(const expression_t *expression, unsigned prec);
  26
  27 void change_indent(int delta)
  28 {
  29         indent += delta;
  30         assert(indent >= 0);
  31 }
  32
  33 void print_indent(void)
  34 {
  35         for(int i = 0; i < indent; ++i)
  36                 fprintf(out, "\t");
  37 }
  38
  39 enum precedence_t {
  40         PREC_BOTTOM  =  0,
  41         PREC_COMMA   =  2, /* ,                                    left to right */
  42         PREC_ASSIGN  =  4, /* = += -= *= /= %= <<= >>= &= ^= |=    right to left */
  43         PREC_COND    =  6, /* ?:                                   right to left */
  44         PREC_LOG_OR  =  8, /* ||                                   left to right */
  45         PREC_LOG_AND = 10, /* &&                                   left to right */
  46         PREC_BIT_OR  = 12, /* |                                    left to right */
  47         PREC_BIT_XOR = 14, /* ^                                    left to right */
  48         PREC_BIT_AND = 16, /* &                                    left to right */
  49         PREC_EQ      = 18, /* == !=                                left to right */
  50         PREC_CMP     = 20, /* < <= > >=                            left to right */
  51         PREC_SHF     = 22, /* << >>                                left to right */
  52         PREC_PLUS    = 24, /* + -                                  left to right */
  53         PREC_MUL     = 26, /* * / %                                left to right */
  54         PREC_UNARY   = 28, /* ! ~ ++ -- + - (type) * & sizeof      right to left */
  55         PREC_ACCESS  = 30, /* () [] -> .                           left to right */
  56         PREC_PRIM    = 32, /* primary */
  57         PREC_TOP     = 34
  58 };
  59
  60 /**
  61  * Returns 1 if a given precedence level has right-to-left
  62  * associativity, else -1.
  63  *
  64  * @param precedence   the operator precedence
  65  */
  66 static int right_to_left(unsigned precedence) {
  67         return (precedence == PREC_ASSIGN || precedence == PREC_COND ||
  68                 precedence == PREC_UNARY) ? 1 : -1;
  69 }
  70
  71 /**
  72  * Return the precedence of an expression given by its kind.
  73  *
  74  * @param kind   the expression kind
  75  */
  76 static unsigned get_expression_precedence(expression_kind_t kind)
  77 {
  78         static const unsigned prec[] = {
  79                 [EXPR_UNKNOWN]                   = PREC_PRIM,
  80                 [EXPR_INVALID]                   = PREC_PRIM,
  81                 [EXPR_REFERENCE]                 = PREC_PRIM,
  82                 [EXPR_CHAR_CONST]                = PREC_PRIM,
  83                 [EXPR_CONST]                     = PREC_PRIM,
  84                 [EXPR_STRING_LITERAL]            = PREC_PRIM,
  85                 [EXPR_WIDE_STRING_LITERAL]       = PREC_PRIM,
  86                 [EXPR_CALL]                      = PREC_PRIM,
  87                 [EXPR_CONDITIONAL]               = PREC_COND,
  88                 [EXPR_SELECT]                    = PREC_ACCESS,
  89                 [EXPR_ARRAY_ACCESS]              = PREC_ACCESS,
  90                 [EXPR_SIZEOF]                    = PREC_UNARY,
  91                 [EXPR_CLASSIFY_TYPE]             = PREC_UNARY,
  92                 [EXPR_ALIGNOF]                   = PREC_UNARY,
  93
  94                 [EXPR_FUNCTION]                  = PREC_PRIM,
  95                 [EXPR_PRETTY_FUNCTION]           = PREC_PRIM,
  96                 [EXPR_BUILTIN_SYMBOL]            = PREC_PRIM,
  97                 [EXPR_BUILTIN_CONSTANT_P]        = PREC_PRIM,
  98                 [EXPR_BUILTIN_PREFETCH]          = PREC_PRIM,
  99                 [EXPR_OFFSETOF]                  = PREC_PRIM,
 100                 [EXPR_VA_START]                  = PREC_PRIM,
 101                 [EXPR_VA_ARG]                    = PREC_PRIM,
 102                 [EXPR_STATEMENT]                 = PREC_ACCESS,
 103
 104                 [EXPR_UNARY_NEGATE]              = PREC_UNARY,
 105                 [EXPR_UNARY_PLUS]                = PREC_UNARY,
 106                 [EXPR_UNARY_BITWISE_NEGATE]      = PREC_UNARY,
 107                 [EXPR_UNARY_NOT]                 = PREC_UNARY,
 108                 [EXPR_UNARY_DEREFERENCE]         = PREC_UNARY,
 109                 [EXPR_UNARY_TAKE_ADDRESS]        = PREC_UNARY,
 110                 [EXPR_UNARY_POSTFIX_INCREMENT]   = PREC_UNARY,
 111                 [EXPR_UNARY_POSTFIX_DECREMENT]   = PREC_UNARY,
 112                 [EXPR_UNARY_PREFIX_INCREMENT]    = PREC_UNARY,
 113                 [EXPR_UNARY_PREFIX_DECREMENT]    = PREC_UNARY,
 114                 [EXPR_UNARY_CAST]                = PREC_UNARY,
 115                 [EXPR_UNARY_CAST_IMPLICIT]       = PREC_UNARY,
 116                 [EXPR_UNARY_ASSUME]              = PREC_PRIM,
 117                 [EXPR_UNARY_BITFIELD_EXTRACT]    = PREC_ACCESS,
 118
 119                 [EXPR_BINARY_ADD]                = PREC_PLUS,
 120                 [EXPR_BINARY_SUB]                = PREC_PLUS,
 121                 [EXPR_BINARY_MUL]                = PREC_MUL,
 122                 [EXPR_BINARY_DIV]                = PREC_MUL,
 123                 [EXPR_BINARY_MOD]                = PREC_MUL,
 124                 [EXPR_BINARY_EQUAL]              = PREC_EQ,
 125                 [EXPR_BINARY_NOTEQUAL]           = PREC_EQ,
 126                 [EXPR_BINARY_LESS]               = PREC_CMP,
 127                 [EXPR_BINARY_LESSEQUAL]          = PREC_CMP,
 128                 [EXPR_BINARY_GREATER]            = PREC_CMP,
 129                 [EXPR_BINARY_GREATEREQUAL]       = PREC_CMP,
 130                 [EXPR_BINARY_BITWISE_AND]        = PREC_BIT_AND,
 131                 [EXPR_BINARY_BITWISE_OR]         = PREC_BIT_OR,
 132                 [EXPR_BINARY_BITWISE_XOR]        = PREC_BIT_XOR,
 133                 [EXPR_BINARY_LOGICAL_AND]        = PREC_LOG_AND,
 134                 [EXPR_BINARY_LOGICAL_OR]         = PREC_LOG_OR,
 135                 [EXPR_BINARY_SHIFTLEFT]          = PREC_SHF,
 136                 [EXPR_BINARY_SHIFTRIGHT]         = PREC_SHF,
 137                 [EXPR_BINARY_ASSIGN]             = PREC_ASSIGN,
 138                 [EXPR_BINARY_MUL_ASSIGN]         = PREC_ASSIGN,
 139                 [EXPR_BINARY_DIV_ASSIGN]         = PREC_ASSIGN,
 140                 [EXPR_BINARY_MOD_ASSIGN]         = PREC_ASSIGN,
 141                 [EXPR_BINARY_ADD_ASSIGN]         = PREC_ASSIGN,
 142                 [EXPR_BINARY_SUB_ASSIGN]         = PREC_ASSIGN,
 143                 [EXPR_BINARY_SHIFTLEFT_ASSIGN]   = PREC_ASSIGN,
 144                 [EXPR_BINARY_SHIFTRIGHT_ASSIGN]  = PREC_ASSIGN,
 145                 [EXPR_BINARY_BITWISE_AND_ASSIGN] = PREC_ASSIGN,
 146                 [EXPR_BINARY_BITWISE_XOR_ASSIGN] = PREC_ASSIGN,
 147                 [EXPR_BINARY_BITWISE_OR_ASSIGN]  = PREC_ASSIGN,
 148                 [EXPR_BINARY_COMMA]              = PREC_COMMA,
 149
 150                 [EXPR_BINARY_BUILTIN_EXPECT]     = PREC_PRIM,
 151                 [EXPR_BINARY_ISGREATER]          = PREC_PRIM,
 152                 [EXPR_BINARY_ISGREATEREQUAL]     = PREC_PRIM,
 153                 [EXPR_BINARY_ISLESS]             = PREC_PRIM,
 154                 [EXPR_BINARY_ISLESSEQUAL]        = PREC_PRIM,
 155                 [EXPR_BINARY_ISLESSGREATER]      = PREC_PRIM,
 156                 [EXPR_BINARY_ISUNORDERED]        = PREC_PRIM
 157         };
 158 #ifndef NDEBUG
 159         if ((unsigned)kind >= (sizeof(prec)/sizeof(prec[0]))) {
 160                 panic("wrong expression kind");
 161         }
 162         unsigned res = prec[kind];
 163         if (res == PREC_BOTTOM) {
 164                 panic("expression kind not defined in get_expression_precedence()");
 165         }
 166 #endif
 167         return res;
 168 }
 169
 170 /**
 171  * Print a constant expression.
 172  *
 173  * @param cnst  the constant expression
 174  */
 175 static void print_const(const const_expression_t *cnst)
 176 {
 177         if(cnst->base.type == NULL)
 178                 return;
 179
 180         const type_t *const type = skip_typeref(cnst->base.type);
 181
 182         if (is_type_integer(type)) {
 183                 fprintf(out, "%lld", cnst->v.int_value);
 184         } else if (is_type_float(type)) {
 185                 fprintf(out, "%Lf", cnst->v.float_value);
 186         } else {
 187                 panic("unknown constant");
 188         }
 189 }
 190
 191 /**
 192  * Print a quoted string constant.
 193  *
 194  * @param string  the string constant
 195  * @param border  the border char
 196  */
 197 static void print_quoted_string(const string_t *const string, char border)
 198 {
 199         fputc(border, out);
 200         const char *end = string->begin + string->size;
 201         for (const char *c = string->begin; c != end; ++c) {
 202                 if (*c == border) {
 203                         fputc('\\', out);
 204                 }
 205                 switch(*c) {
 206                 case '\\':  fputs("\\\\", out); break;
 207                 case '\a':  fputs("\\a", out); break;
 208                 case '\b':  fputs("\\b", out); break;
 209                 case '\f':  fputs("\\f", out); break;
 210                 case '\n':  fputs("\\n", out); break;
 211                 case '\r':  fputs("\\r", out); break;
 212                 case '\t':  fputs("\\t", out); break;
 213                 case '\v':  fputs("\\v", out); break;
 214                 case '\?':  fputs("\\?", out); break;
 215                 default:
 216                         if(!isprint(*c)) {
 217                                 fprintf(out, "\\%03o", *c);
 218                                 break;
 219                         }
 220                         fputc(*c, out);
 221                         break;
 222                 }
 223         }
 224         fputc(border, out);
 225 }
 226
 227 /**
 228  * Print a constant character expression.
 229  *
 230  * @param cnst  the constant character expression
 231  */
 232 static void print_char_const(const const_expression_t *cnst)
 233 {
 234         print_quoted_string(&cnst->v.chars, '\'');
 235 }
 236
 237 /**
 238  * Prints a string literal expression.
 239  *
 240  * @param string_literal  the string literal expression
 241  */
 242 static void print_string_literal(
 243                 const string_literal_expression_t *string_literal)
 244 {
 245         print_quoted_string(&string_literal->value, '"');
 246 }
 247
 248 /**
 249  * Prints a wide string literal expression.
 250  *
 251  * @param wstr  the wide string literal expression
 252  */
 253 static void print_wide_string_literal(
 254         const wide_string_literal_expression_t *const wstr)
 255 {
 256         fputs("L\"", out);
 257         for (const wchar_rep_t *c   = wstr->value.begin,
 258                                *end = c + wstr->value.size;
 259              c != end; ++c) {
 260                 switch (*c) {
 261                         case L'\"':  fputs("\\\"", out); break;
 262                         case L'\\':  fputs("\\\\", out); break;
 263                         case L'\a':  fputs("\\a",  out); break;
 264                         case L'\b':  fputs("\\b",  out); break;
 265                         case L'\f':  fputs("\\f",  out); break;
 266                         case L'\n':  fputs("\\n",  out); break;
 267                         case L'\r':  fputs("\\r",  out); break;
 268                         case L'\t':  fputs("\\t",  out); break;
 269                         case L'\v':  fputs("\\v",  out); break;
 270                         case L'\?':  fputs("\\?",  out); break;
 271                         default: {
 272                                 const unsigned tc = *c;
 273                                 if (tc < 0x80U) {
 274                                         if (!isprint(*c))  {
 275                                                 fprintf(out, "\\%03o", (char)*c);
 276                                         } else {
 277                                                 fputc(*c, out);
 278                                         }
 279                                 } else if (tc < 0x800) {
 280                                         fputc(0xC0 | (tc >> 6),   out);
 281                                         fputc(0x80 | (tc & 0x3F), out);
 282                                 } else if (tc < 0x10000) {
 283                                         fputc(0xE0 | ( tc >> 12),         out);
 284                                         fputc(0x80 | ((tc >>  6) & 0x3F), out);
 285                                         fputc(0x80 | ( tc        & 0x3F), out);
 286                                 } else {
 287                                         fputc(0xF0 | ( tc >> 18),         out);
 288                                         fputc(0x80 | ((tc >> 12) & 0x3F), out);
 289                                         fputc(0x80 | ((tc >>  6) & 0x3F), out);
 290                                         fputc(0x80 | ( tc        & 0x3F), out);
 291                                 }
 292                         }
 293                 }
 294         }
 295         fputc('"', out);
 296 }
 297
 298 /**
 299  * Prints a call expression.
 300  *
 301  * @param call  the call expression
 302  */
 303 static void print_call_expression(const call_expression_t *call)
 304 {
 305         unsigned prec = get_expression_precedence(call->base.kind);
 306         print_expression_prec(call->function, prec);
 307         fprintf(out, "(");
 308         call_argument_t *argument = call->arguments;
 309         int              first    = 1;
 310         while(argument != NULL) {
 311                 if(!first) {
 312                         fprintf(out, ", ");
 313                 } else {
 314                         first = 0;
 315                 }
 316                 print_expression_prec(argument->expression, PREC_COMMA + 1);
 317
 318                 argument = argument->next;
 319         }
 320         fprintf(out, ")");
 321 }
 322
 323 /**
 324  * Prints a binary expression.
 325  *
 326  * @param binexpr   the binary expression
 327  */
 328 static void print_binary_expression(const binary_expression_t *binexpr)
 329 {
 330         unsigned prec = get_expression_precedence(binexpr->base.kind);
 331         int      r2l  = right_to_left(prec);
 332
 333         if(binexpr->base.kind == EXPR_BINARY_BUILTIN_EXPECT) {
 334                 fputs("__builtin_expect(", out);
 335                 print_expression_prec(binexpr->left, prec);
 336                 fputs(", ", out);
 337                 print_expression_prec(binexpr->right, prec);
 338                 fputc(')', out);
 339                 return;
 340         }
 341
 342         print_expression_prec(binexpr->left, prec + r2l);
 343         if (binexpr->base.kind != EXPR_BINARY_COMMA) {
 344                 fputc(' ', out);
 345         }
 346         switch (binexpr->base.kind) {
 347         case EXPR_BINARY_COMMA:              fputs(",", out);     break;
 348         case EXPR_BINARY_ASSIGN:             fputs("=", out);     break;
 349         case EXPR_BINARY_ADD:                fputs("+", out);     break;
 350         case EXPR_BINARY_SUB:                fputs("-", out);     break;
 351         case EXPR_BINARY_MUL:                fputs("*", out);     break;
 352         case EXPR_BINARY_MOD:                fputs("%", out);     break;
 353         case EXPR_BINARY_DIV:                fputs("/", out);     break;
 354         case EXPR_BINARY_BITWISE_OR:         fputs("|", out);     break;
 355         case EXPR_BINARY_BITWISE_AND:        fputs("&", out);     break;
 356         case EXPR_BINARY_BITWISE_XOR:        fputs("^", out);     break;
 357         case EXPR_BINARY_LOGICAL_OR:         fputs("||", out);    break;
 358         case EXPR_BINARY_LOGICAL_AND:        fputs("&&", out);    break;
 359         case EXPR_BINARY_NOTEQUAL:           fputs("!=", out);    break;
 360         case EXPR_BINARY_EQUAL:              fputs("==", out);    break;
 361         case EXPR_BINARY_LESS:               fputs("<", out);     break;
 362         case EXPR_BINARY_LESSEQUAL:          fputs("<=", out);    break;
 363         case EXPR_BINARY_GREATER:            fputs(">", out);     break;
 364         case EXPR_BINARY_GREATEREQUAL:       fputs(">=", out);    break;
 365         case EXPR_BINARY_SHIFTLEFT:          fputs("<<", out);    break;
 366         case EXPR_BINARY_SHIFTRIGHT:         fputs(">>", out);    break;
 367
 368         case EXPR_BINARY_ADD_ASSIGN:         fputs("+=", out);    break;
 369         case EXPR_BINARY_SUB_ASSIGN:         fputs("-=", out);    break;
 370         case EXPR_BINARY_MUL_ASSIGN:         fputs("*=", out);    break;
 371         case EXPR_BINARY_MOD_ASSIGN:         fputs("%=", out);    break;
 372         case EXPR_BINARY_DIV_ASSIGN:         fputs("/=", out);    break;
 373         case EXPR_BINARY_BITWISE_OR_ASSIGN:  fputs("|=", out);    break;
 374         case EXPR_BINARY_BITWISE_AND_ASSIGN: fputs("&=", out);    break;
 375         case EXPR_BINARY_BITWISE_XOR_ASSIGN: fputs("^=", out);    break;
 376         case EXPR_BINARY_SHIFTLEFT_ASSIGN:   fputs("<<=", out);   break;
 377         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:  fputs(">>=", out);   break;
 378         default: panic("invalid binexpression found");
 379         }
 380         fputc(' ', out);
 381         print_expression_prec(binexpr->right, prec - r2l);
 382 }
 383
 384 /**
 385  * Prints an unary expression.
 386  *
 387  * @param unexpr   the unary expression
 388  */
 389 static void print_unary_expression(const unary_expression_t *unexpr)
 390 {
 391         unsigned prec = get_expression_precedence(unexpr->base.kind);
 392         switch(unexpr->base.kind) {
 393         case EXPR_UNARY_NEGATE:           fputs("-", out);  break;
 394         case EXPR_UNARY_PLUS:             fputs("+", out);  break;
 395         case EXPR_UNARY_NOT:              fputs("!", out);  break;
 396         case EXPR_UNARY_BITWISE_NEGATE:   fputs("~", out);  break;
 397         case EXPR_UNARY_PREFIX_INCREMENT: fputs("++", out); break;
 398         case EXPR_UNARY_PREFIX_DECREMENT: fputs("--", out); break;
 399         case EXPR_UNARY_DEREFERENCE:      fputs("*", out);  break;
 400         case EXPR_UNARY_TAKE_ADDRESS:     fputs("&", out);  break;
 401
 402         case EXPR_UNARY_BITFIELD_EXTRACT:
 403                 print_expression_prec(unexpr->value, prec);
 404                 return;
 405
 406         case EXPR_UNARY_POSTFIX_INCREMENT:
 407                 print_expression_prec(unexpr->value, prec);
 408                 fputs("++", out);
 409                 return;
 410         case EXPR_UNARY_POSTFIX_DECREMENT:
 411                 print_expression_prec(unexpr->value, prec);
 412                 fputs("--", out);
 413                 return;
 414         case EXPR_UNARY_CAST_IMPLICIT:
 415                 if(!print_implicit_casts) {
 416                         print_expression_prec(unexpr->value, prec);
 417                         return;
 418                 }
 419                 /* fallthrough */
 420         case EXPR_UNARY_CAST:
 421                 fputc('(', out);
 422                 print_type(unexpr->base.type);
 423                 fputc(')', out);
 424                 break;
 425         case EXPR_UNARY_ASSUME:
 426                 fputs("__assume(", out);
 427                 print_expression_prec(unexpr->value, PREC_COMMA + 1);
 428                 fputc(')', out);
 429                 return;
 430         default:
 431                 panic("invalid unary expression found");
 432         }
 433         print_expression_prec(unexpr->value, prec);
 434 }
 435
 436 /**
 437  * Prints a reference expression.
 438  *
 439  * @param ref   the reference expression
 440  */
 441 static void print_reference_expression(const reference_expression_t *ref)
 442 {
 443         fprintf(out, "%s", ref->declaration->symbol->string);
 444 }
 445
 446 /**
 447  * Prints an array expression.
 448  *
 449  * @param expression   the array expression
 450  */
 451 static void print_array_expression(const array_access_expression_t *expression)
 452 {
 453         unsigned prec = get_expression_precedence(expression->base.kind);
 454         if(!expression->flipped) {
 455                 print_expression_prec(expression->array_ref, prec);
 456                 fputc('[', out);
 457                 print_expression_prec(expression->index, prec);
 458                 fputc(']', out);
 459         } else {
 460                 print_expression_prec(expression->index, prec);
 461                 fputc('[', out);
 462                 print_expression_prec(expression->array_ref, prec);
 463                 fputc(']', out);
 464         }
 465 }
 466
 467 /**
 468  * Prints a typeproperty expression (sizeof or __alignof__).
 469  *
 470  * @param expression   the type property expression
 471  */
 472 static void print_typeprop_expression(const typeprop_expression_t *expression)
 473 {
 474         if (expression->base.kind == EXPR_SIZEOF) {
 475                 fputs("sizeof", out);
 476         } else {
 477                 assert(expression->base.kind == EXPR_ALIGNOF);
 478                 fputs("__alignof__", out);
 479         }
 480         if(expression->tp_expression != NULL) {
 481                 /* always print the '()' here, sizeof x is right but unusual */
 482                 fputc('(', out);
 483                 print_expression_prec(expression->tp_expression, PREC_ACCESS);
 484                 fputc(')', out);
 485         } else {
 486                 fputc('(', out);
 487                 print_type(expression->type);
 488                 fputc(')', out);
 489         }
 490 }
 491
 492 /**
 493  * Prints an builtin symbol.
 494  *
 495  * @param expression   the builtin symbol expression
 496  */
 497 static void print_builtin_symbol(const builtin_symbol_expression_t *expression)
 498 {
 499         fputs(expression->symbol->string, out);
 500 }
 501
 502 /**
 503  * Prints a builtin constant expression.
 504  *
 505  * @param expression   the builtin constant expression
 506  */
 507 static void print_builtin_constant(const builtin_constant_expression_t *expression)
 508 {
 509         fputs("__builtin_constant_p(", out);
 510         print_expression_prec(expression->value, PREC_COMMA + 1);
 511         fputc(')', out);
 512 }
 513
 514 /**
 515  * Prints a builtin prefetch expression.
 516  *
 517  * @param expression   the builtin prefetch expression
 518  */
 519 static void print_builtin_prefetch(const builtin_prefetch_expression_t *expression)
 520 {
 521         fputs("__builtin_prefetch(", out);
 522         print_expression_prec(expression->adr, PREC_COMMA + 1);
 523         if (expression->rw) {
 524                 fputc(',', out);
 525                 print_expression_prec(expression->rw, PREC_COMMA + 1);
 526         }
 527         if (expression->locality) {
 528                 fputc(',', out);
 529                 print_expression_prec(expression->locality, PREC_COMMA + 1);
 530         }
 531         fputc(')', out);
 532 }
 533
 534 /**
 535  * Prints a conditional expression.
 536  *
 537  * @param expression   the conditional expression
 538  */
 539 static void print_conditional(const conditional_expression_t *expression)
 540 {
 541         unsigned prec = get_expression_precedence(expression->base.kind);
 542         fputs("(", out);
 543         print_expression_prec(expression->condition, prec);
 544         fputs(" ? ", out);
 545         print_expression_prec(expression->true_expression, prec);
 546         fputs(" : ", out);
 547         print_expression_prec(expression->false_expression, prec);
 548         fputs(")", out);
 549 }
 550
 551 /**
 552  * Prints a va_start expression.
 553  *
 554  * @param expression   the va_start expression
 555  */
 556 static void print_va_start(const va_start_expression_t *const expression)
 557 {
 558         fputs("__builtin_va_start(", out);
 559         print_expression_prec(expression->ap, PREC_COMMA + 1);
 560         fputs(", ", out);
 561         fputs(expression->parameter->symbol->string, out);
 562         fputs(")", out);
 563 }
 564
 565 /**
 566  * Prints a va_arg expression.
 567  *
 568  * @param expression   the va_arg expression
 569  */
 570 static void print_va_arg(const va_arg_expression_t *expression)
 571 {
 572         fputs("__builtin_va_arg(", out);
 573         print_expression_prec(expression->ap, PREC_COMMA + 1);
 574         fputs(", ", out);
 575         print_type(expression->base.type);
 576         fputs(")", out);
 577 }
 578
 579 /**
 580  * Prints a select expression (. or ->).
 581  *
 582  * @param expression   the select expression
 583  */
 584 static void print_select(const select_expression_t *expression)
 585 {
 586         unsigned prec = get_expression_precedence(expression->base.kind);
 587         print_expression_prec(expression->compound, prec);
 588         if(expression->compound->base.type == NULL ||
 589                         expression->compound->base.type->kind == TYPE_POINTER) {
 590                 fputs("->", out);
 591         } else {
 592                 fputc('.', out);
 593         }
 594         fputs(expression->symbol->string, out);
 595 }
 596
 597 /**
 598  * Prints a type classify expression.
 599  *
 600  * @param expr   the type classify expression
 601  */
 602 static void print_classify_type_expression(
 603         const classify_type_expression_t *const expr)
 604 {
 605         fputs("__builtin_classify_type(", out);
 606         print_expression_prec(expr->type_expression, PREC_COMMA + 1);
 607         fputc(')', out);
 608 }
 609
 610 /**
 611  * Prints a designator.
 612  *
 613  * @param designator  the designator
 614  */
 615 static void print_designator(const designator_t *designator)
 616 {
 617         fputs(designator->symbol->string, out);
 618         for (designator = designator->next; designator != NULL; designator = designator->next) {
 619                 if (designator->array_access) {
 620                         fputc('[', out);
 621                         print_expression_prec(designator->array_access, PREC_ACCESS);
 622                         fputc(']', out);
 623                 } else {
 624                         fputc('.', out);
 625                         fputs(designator->symbol->string, out);
 626                 }
 627         }
 628 }
 629
 630 /**
 631  * Prints an offsetof expression.
 632  *
 633  * @param expression   the offset expression
 634  */
 635 static void print_offsetof_expression(const offsetof_expression_t *expression)
 636 {
 637         fputs("__builtin_offsetof", out);
 638         fputc('(', out);
 639         print_type(expression->type);
 640         fputc(',', out);
 641         print_designator(expression->designator);
 642         fputc(')', out);
 643 }
 644
 645 /**
 646  * Prints a statement expression.
 647  *
 648  * @param expression   the statement expression
 649  */
 650 static void print_statement_expression(const statement_expression_t *expression)
 651 {
 652         fputc('(', out);
 653         print_statement(expression->statement);
 654         fputc(')', out);
 655 }
 656
 657 /**
 658  * Prints an expression with parenthesis if needed.
 659  *
 660  * @param expression  the expression to print
 661  * @param top_prec    the precedence of the user of this expression.
 662  */
 663 static void print_expression_prec(const expression_t *expression, unsigned top_prec)
 664 {
 665         unsigned prec = get_expression_precedence(expression->base.kind);
 666         if (print_parenthesis && top_prec != PREC_BOTTOM)
 667                 top_prec = PREC_TOP;
 668         if (top_prec > prec)
 669                 fputc('(', out);
 670         switch(expression->kind) {
 671         case EXPR_UNKNOWN:
 672         case EXPR_INVALID:
 673                 fprintf(out, "*invalid expression*");
 674                 break;
 675         case EXPR_CHAR_CONST:
 676                 print_char_const(&expression->conste);
 677                 break;
 678         case EXPR_CONST:
 679                 print_const(&expression->conste);
 680                 break;
 681         case EXPR_FUNCTION:
 682         case EXPR_PRETTY_FUNCTION:
 683         case EXPR_STRING_LITERAL:
 684                 print_string_literal(&expression->string);
 685                 break;
 686         case EXPR_WIDE_STRING_LITERAL:
 687                 print_wide_string_literal(&expression->wide_string);
 688                 break;
 689         case EXPR_CALL:
 690                 print_call_expression(&expression->call);
 691                 break;
 692         EXPR_BINARY_CASES
 693                 print_binary_expression(&expression->binary);
 694                 break;
 695         case EXPR_REFERENCE:
 696                 print_reference_expression(&expression->reference);
 697                 break;
 698         case EXPR_ARRAY_ACCESS:
 699                 print_array_expression(&expression->array_access);
 700                 break;
 701         EXPR_UNARY_CASES
 702                 print_unary_expression(&expression->unary);
 703                 break;
 704         case EXPR_SIZEOF:
 705         case EXPR_ALIGNOF:
 706                 print_typeprop_expression(&expression->typeprop);
 707                 break;
 708         case EXPR_BUILTIN_SYMBOL:
 709                 print_builtin_symbol(&expression->builtin_symbol);
 710                 break;
 711         case EXPR_BUILTIN_CONSTANT_P:
 712                 print_builtin_constant(&expression->builtin_constant);
 713                 break;
 714         case EXPR_BUILTIN_PREFETCH:
 715                 print_builtin_prefetch(&expression->builtin_prefetch);
 716                 break;
 717         case EXPR_CONDITIONAL:
 718                 print_conditional(&expression->conditional);
 719                 break;
 720         case EXPR_VA_START:
 721                 print_va_start(&expression->va_starte);
 722                 break;
 723         case EXPR_VA_ARG:
 724                 print_va_arg(&expression->va_arge);
 725                 break;
 726         case EXPR_SELECT:
 727                 print_select(&expression->select);
 728                 break;
 729         case EXPR_CLASSIFY_TYPE:
 730                 print_classify_type_expression(&expression->classify_type);
 731                 break;
 732         case EXPR_OFFSETOF:
 733                 print_offsetof_expression(&expression->offsetofe);
 734                 break;
 735         case EXPR_STATEMENT:
 736                 print_statement_expression(&expression->statement);
 737                 break;
 738
 739         default:
 740                 /* TODO */
 741                 fprintf(out, "some expression of type %d", (int) expression->kind);
 742                 break;
 743         }
 744         if (top_prec > prec)
 745                 fputc(')', out);
 746 }
 747
 748 /**
 749  * Print an compound statement.
 750  *
 751  * @param block  the compound statement
 752  */
 753 static void print_compound_statement(const compound_statement_t *block)
 754 {
 755         fputs("{\n", out);
 756         ++indent;
 757
 758         statement_t *statement = block->statements;
 759         while(statement != NULL) {
 760                 if (statement->base.kind == STATEMENT_CASE_LABEL)
 761                         --indent;
 762                 print_indent();
 763                 print_statement(statement);
 764
 765                 statement = statement->base.next;
 766         }
 767         --indent;
 768         print_indent();
 769         fputs("}\n", out);
 770 }
 771
 772 /**
 773  * Print a return statement.
 774  *
 775  * @param statement  the return statement
 776  */
 777 static void print_return_statement(const return_statement_t *statement)
 778 {
 779         fprintf(out, "return ");
 780         if(statement->value != NULL)
 781                 print_expression(statement->value);
 782         fputs(";\n", out);
 783 }
 784
 785 /**
 786  * Print an expression statement.
 787  *
 788  * @param statement  the expression statement
 789  */
 790 static void print_expression_statement(const expression_statement_t *statement)
 791 {
 792         print_expression(statement->expression);
 793         fputs(";\n", out);
 794 }
 795
 796 /**
 797  * Print a goto statement.
 798  *
 799  * @param statement  the goto statement
 800  */
 801 static void print_goto_statement(const goto_statement_t *statement)
 802 {
 803         fprintf(out, "goto ");
 804         fputs(statement->label->symbol->string, out);
 805         fprintf(stderr, "(%p)", (void*) statement->label);
 806         fputs(";\n", out);
 807 }
 808
 809 /**
 810  * Print a label statement.
 811  *
 812  * @param statement  the label statement
 813  */
 814 static void print_label_statement(const label_statement_t *statement)
 815 {
 816         fprintf(stderr, "(%p)", (void*) statement->label);
 817         fprintf(out, "%s:\n", statement->label->symbol->string);
 818         if(statement->statement != NULL) {
 819                 print_statement(statement->statement);
 820         }
 821 }
 822
 823 /**
 824  * Print an if statement.
 825  *
 826  * @param statement  the if statement
 827  */
 828 static void print_if_statement(const if_statement_t *statement)
 829 {
 830         fputs("if(", out);
 831         print_expression(statement->condition);
 832         fputs(") ", out);
 833         if(statement->true_statement != NULL) {
 834                 print_statement(statement->true_statement);
 835         }
 836
 837         if(statement->false_statement != NULL) {
 838                 print_indent();
 839                 fputs("else ", out);
 840                 print_statement(statement->false_statement);
 841         }
 842 }
 843
 844 /**
 845  * Print a switch statement.
 846  *
 847  * @param statement  the switch statement
 848  */
 849 static void print_switch_statement(const switch_statement_t *statement)
 850 {
 851         fputs("switch(", out);
 852         print_expression(statement->expression);
 853         fputs(") ", out);
 854         print_statement(statement->body);
 855 }
 856
 857 /**
 858  * Print a case label (including the default label).
 859  *
 860  * @param statement  the case label statement
 861  */
 862 static void print_case_label(const case_label_statement_t *statement)
 863 {
 864         if(statement->expression == NULL) {
 865                 fputs("default:\n", out);
 866         } else {
 867                 fputs("case ", out);
 868                 print_expression(statement->expression);
 869                 if (statement->end_range != NULL) {
 870                         fputs(" ... ", out);
 871                         print_expression(statement->end_range);
 872                 }
 873                 fputs(":\n", out);
 874         }
 875         ++indent;
 876         if(statement->statement != NULL) {
 877                 if (statement->statement->base.kind == STATEMENT_CASE_LABEL) {
 878                         --indent;
 879                 }
 880                 print_indent();
 881                 print_statement(statement->statement);
 882         }
 883 }
 884
 885 /**
 886  * Print a declaration statement.
 887  *
 888  * @param statement   the statement
 889  */
 890 static void print_declaration_statement(
 891                 const declaration_statement_t *statement)
 892 {
 893         int first = 1;
 894         declaration_t *declaration = statement->declarations_begin;
 895         for( ; declaration != statement->declarations_end->next;
 896                declaration = declaration->next) {
 897                 if(!first) {
 898                         print_indent();
 899                 } else {
 900                         first = 0;
 901                 }
 902                 print_declaration(declaration);
 903                 fputc('\n', out);
 904         }
 905 }
 906
 907 /**
 908  * Print a while statement.
 909  *
 910  * @param statement   the statement
 911  */
 912 static void print_while_statement(const while_statement_t *statement)
 913 {
 914         fputs("while(", out);
 915         print_expression(statement->condition);
 916         fputs(") ", out);
 917         print_statement(statement->body);
 918 }
 919
 920 /**
 921  * Print a do-while statement.
 922  *
 923  * @param statement   the statement
 924  */
 925 static void print_do_while_statement(const do_while_statement_t *statement)
 926 {
 927         fputs("do ", out);
 928         print_statement(statement->body);
 929         print_indent();
 930         fputs("while(", out);
 931         print_expression(statement->condition);
 932         fputs(");\n", out);
 933 }
 934
 935 /**
 936  * Print a for statement.
 937  *
 938  * @param statement   the statement
 939  */
 940 static void print_for_statement(const for_statement_t *statement)
 941 {
 942         fputs("for(", out);
 943         if(statement->scope.declarations != NULL) {
 944                 assert(statement->initialisation == NULL);
 945                 print_declaration(statement->scope.declarations);
 946                 if(statement->scope.declarations->next != NULL) {
 947                         panic("multiple declarations in for statement not supported yet");
 948                 }
 949                 fputc(' ', out);
 950         } else {
 951                 if(statement->initialisation) {
 952                         print_expression(statement->initialisation);
 953                 }
 954                 fputs("; ", out);
 955         }
 956         if(statement->condition != NULL) {
 957                 print_expression(statement->condition);
 958         }
 959         fputs("; ", out);
 960         if(statement->step != NULL) {
 961                 print_expression(statement->step);
 962         }
 963         fputs(")", out);
 964         print_statement(statement->body);
 965 }
 966
 967 /**
 968  * Print assembler constraints.
 969  *
 970  * @param constraints   the constraints
 971  */
 972 static void print_asm_constraints(asm_constraint_t *constraints)
 973 {
 974         asm_constraint_t *constraint = constraints;
 975         for( ; constraint != NULL; constraint = constraint->next) {
 976                 if(constraint != constraints)
 977                         fputs(", ", out);
 978
 979                 if(constraint->symbol) {
 980                         fprintf(out, "[%s] ", constraint->symbol->string);
 981                 }
 982                 print_quoted_string(&constraint->constraints, '"');
 983                 fputs(" (", out);
 984                 print_expression(constraint->expression);
 985                 fputs(")", out);
 986         }
 987 }
 988
 989 /**
 990  * Print assembler clobbers.
 991  *
 992  * @param clobbers   the clobbers
 993  */
 994 static void print_asm_clobbers(asm_clobber_t *clobbers)
 995 {
 996         asm_clobber_t *clobber = clobbers;
 997         for( ; clobber != NULL; clobber = clobber->next) {
 998                 if(clobber != clobbers)
 999                         fputs(", ", out);
1000
1001                 print_quoted_string(&clobber->clobber, '"');
1002         }
1003 }
1004
1005 /**
1006  * Print an assembler statement.
1007  *
1008  * @param statement   the statement
1009  */
1010 static void print_asm_statement(const asm_statement_t *statement)
1011 {
1012         fputs("asm ", out);
1013         if(statement->is_volatile) {
1014                 fputs("volatile ", out);
1015         }
1016         fputs("(", out);
1017         print_quoted_string(&statement->asm_text, '"');
1018         if(statement->inputs == NULL && statement->outputs == NULL
1019                         && statement->clobbers == NULL)
1020                 goto end_of_print_asm_statement;
1021
1022         fputs(" : ", out);
1023         print_asm_constraints(statement->inputs);
1024         if(statement->outputs == NULL && statement->clobbers == NULL)
1025                 goto end_of_print_asm_statement;
1026
1027         fputs(" : ", out);
1028         print_asm_constraints(statement->outputs);
1029         if(statement->clobbers == NULL)
1030                 goto end_of_print_asm_statement;
1031
1032         fputs(" : ", out);
1033         print_asm_clobbers(statement->clobbers);
1034
1035 end_of_print_asm_statement:
1036         fputs(");\n", out);
1037 }
1038
1039 /**
1040  * Print a statement.
1041  *
1042  * @param statement   the statement
1043  */
1044 void print_statement(const statement_t *statement)
1045 {
1046         switch(statement->kind) {
1047         case STATEMENT_COMPOUND:
1048                 print_compound_statement(&statement->compound);
1049                 break;
1050         case STATEMENT_RETURN:
1051                 print_return_statement(&statement->returns);
1052                 break;
1053         case STATEMENT_EXPRESSION:
1054                 print_expression_statement(&statement->expression);
1055                 break;
1056         case STATEMENT_LABEL:
1057                 print_label_statement(&statement->label);
1058                 break;
1059         case STATEMENT_GOTO:
1060                 print_goto_statement(&statement->gotos);
1061                 break;
1062         case STATEMENT_CONTINUE:
1063                 fputs("continue;\n", out);
1064                 break;
1065         case STATEMENT_BREAK:
1066                 fputs("break;\n", out);
1067                 break;
1068         case STATEMENT_IF:
1069                 print_if_statement(&statement->ifs);
1070                 break;
1071         case STATEMENT_SWITCH:
1072                 print_switch_statement(&statement->switchs);
1073                 break;
1074         case STATEMENT_CASE_LABEL:
1075                 print_case_label(&statement->case_label);
1076                 break;
1077         case STATEMENT_DECLARATION:
1078                 print_declaration_statement(&statement->declaration);
1079                 break;
1080         case STATEMENT_WHILE:
1081                 print_while_statement(&statement->whiles);
1082                 break;
1083         case STATEMENT_DO_WHILE:
1084                 print_do_while_statement(&statement->do_while);
1085                 break;
1086         case STATEMENT_FOR:
1087                 print_for_statement(&statement->fors);
1088                 break;
1089         case STATEMENT_ASM:
1090                 print_asm_statement(&statement->asms);
1091                 break;
1092         case STATEMENT_INVALID:
1093                 fprintf(out, "*invalid statement*");
1094                 break;
1095         }
1096 }
1097
1098 /**
1099  * Print a storage class.
1100  *
1101  * @param storage_class   the storage class
1102  */
1103 static void print_storage_class(unsigned storage_class)
1104 {
1105         switch((storage_class_tag_t) storage_class) {
1106         case STORAGE_CLASS_ENUM_ENTRY:
1107         case STORAGE_CLASS_NONE:
1108                 break;
1109         case STORAGE_CLASS_TYPEDEF:       fputs("typedef ",        out); break;
1110         case STORAGE_CLASS_EXTERN:        fputs("extern ",         out); break;
1111         case STORAGE_CLASS_STATIC:        fputs("static ",         out); break;
1112         case STORAGE_CLASS_AUTO:          fputs("auto ",           out); break;
1113         case STORAGE_CLASS_REGISTER:      fputs("register ",       out); break;
1114         case STORAGE_CLASS_THREAD:        fputs("__thread",        out); break;
1115         case STORAGE_CLASS_THREAD_EXTERN: fputs("extern __thread", out); break;
1116         case STORAGE_CLASS_THREAD_STATIC: fputs("static __thread", out); break;
1117         }
1118 }
1119
1120 /**
1121  * Print an initializer.
1122  *
1123  * @param initializer  the initializer
1124  */
1125 void print_initializer(const initializer_t *initializer)
1126 {
1127         if(initializer->kind == INITIALIZER_VALUE) {
1128                 const initializer_value_t *value = &initializer->value;
1129                 print_expression(value->value);
1130                 return;
1131         }
1132
1133         assert(initializer->kind == INITIALIZER_LIST);
1134         fputs("{ ", out);
1135         const initializer_list_t *list = &initializer->list;
1136
1137         for(size_t i = 0 ; i < list->len; ++i) {
1138                 if(i > 0) {
1139                         fputs(", ", out);
1140                 }
1141                 print_initializer(list->initializers[i]);
1142         }
1143         fputs("}", out);
1144 }
1145
1146 /**
1147  * Print a declaration in the NORMAL namespace.
1148  *
1149  * @param declaration  the declaration
1150  */
1151 static void print_normal_declaration(const declaration_t *declaration)
1152 {
1153         print_storage_class(declaration->storage_class);
1154         if(declaration->is_inline) {
1155                 if (declaration->modifiers & DM_FORCEINLINE)
1156                         fputs("__forceinline ", out);
1157                 else
1158                         fputs("inline ", out);
1159         }
1160         print_type_ext(declaration->type, declaration->symbol,
1161                        &declaration->scope);
1162
1163         if(declaration->type->kind == TYPE_FUNCTION) {
1164                 if(declaration->init.statement != NULL) {
1165                         fputs("\n", out);
1166                         print_statement(declaration->init.statement);
1167                         return;
1168                 }
1169         } else if(declaration->init.initializer != NULL) {
1170                 fputs(" = ", out);
1171                 print_initializer(declaration->init.initializer);
1172         }
1173         fputc(';', out);
1174 }
1175
1176 /**
1177  * Prints an expression.
1178  *
1179  * @param expression  the expression
1180  */
1181 void print_expression(const expression_t *expression) {
1182         print_expression_prec(expression, PREC_BOTTOM);
1183 }
1184
1185 /**
1186  * Print a declaration.
1187  *
1188  * @param declaration  the declaration
1189  */
1190 void print_declaration(const declaration_t *declaration)
1191 {
1192         if(declaration->namespc != NAMESPACE_NORMAL &&
1193                         declaration->symbol == NULL)
1194                 return;
1195
1196         switch(declaration->namespc) {
1197         case NAMESPACE_NORMAL:
1198                 print_normal_declaration(declaration);
1199                 break;
1200         case NAMESPACE_STRUCT:
1201                 fputs("struct ", out);
1202                 fputs(declaration->symbol->string, out);
1203                 fputc(' ', out);
1204                 print_compound_definition(declaration);
1205                 fputc(';', out);
1206                 break;
1207         case NAMESPACE_UNION:
1208                 fputs("union ", out);
1209                 fputs(declaration->symbol->string, out);
1210                 fputc(' ', out);
1211                 print_compound_definition(declaration);
1212                 fputc(';', out);
1213                 break;
1214         case NAMESPACE_ENUM:
1215                 fputs("enum ", out);
1216                 fputs(declaration->symbol->string, out);
1217                 fputc(' ', out);
1218                 print_enum_definition(declaration);
1219                 fputc(';', out);
1220                 break;
1221         }
1222 }
1223
1224 /**
1225  * Print the AST of a translation unit.
1226  *
1227  * @param unit   the translation unit
1228  */
1229 void print_ast(const translation_unit_t *unit)
1230 {
1231         inc_type_visited();
1232
1233         declaration_t *declaration = unit->scope.declarations;
1234         for( ; declaration != NULL; declaration = declaration->next) {
1235                 if(declaration->storage_class == STORAGE_CLASS_ENUM_ENTRY)
1236                         continue;
1237                 if(declaration->namespc != NAMESPACE_NORMAL &&
1238                                 declaration->symbol == NULL)
1239                         continue;
1240
1241                 print_indent();
1242                 print_declaration(declaration);
1243                 fputc('\n', out);
1244         }
1245 }
1246
1247 /**
1248  * Returns true if a given expression is a compile time
1249  * constant.
1250  *
1251  * @param expression  the expression to check
1252  */
1253 bool is_constant_expression(const expression_t *expression)
1254 {
1255         switch(expression->kind) {
1256
1257         case EXPR_CONST:
1258         case EXPR_CHAR_CONST:
1259         case EXPR_STRING_LITERAL:
1260         case EXPR_WIDE_STRING_LITERAL:
1261         case EXPR_SIZEOF:
1262         case EXPR_CLASSIFY_TYPE:
1263         case EXPR_FUNCTION:
1264         case EXPR_PRETTY_FUNCTION:
1265         case EXPR_OFFSETOF:
1266         case EXPR_ALIGNOF:
1267         case EXPR_BUILTIN_CONSTANT_P:
1268                 return true;
1269
1270         case EXPR_BUILTIN_SYMBOL:
1271         case EXPR_BUILTIN_PREFETCH:
1272         case EXPR_CALL:
1273         case EXPR_SELECT:
1274         case EXPR_VA_START:
1275         case EXPR_VA_ARG:
1276         case EXPR_STATEMENT:
1277         case EXPR_UNARY_POSTFIX_INCREMENT:
1278         case EXPR_UNARY_POSTFIX_DECREMENT:
1279         case EXPR_UNARY_PREFIX_INCREMENT:
1280         case EXPR_UNARY_PREFIX_DECREMENT:
1281         case EXPR_UNARY_BITFIELD_EXTRACT:
1282         case EXPR_UNARY_ASSUME: /* has VOID type */
1283         case EXPR_BINARY_ASSIGN:
1284         case EXPR_BINARY_MUL_ASSIGN:
1285         case EXPR_BINARY_DIV_ASSIGN:
1286         case EXPR_BINARY_MOD_ASSIGN:
1287         case EXPR_BINARY_ADD_ASSIGN:
1288         case EXPR_BINARY_SUB_ASSIGN:
1289         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
1290         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
1291         case EXPR_BINARY_BITWISE_AND_ASSIGN:
1292         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
1293         case EXPR_BINARY_BITWISE_OR_ASSIGN:
1294         case EXPR_BINARY_COMMA:
1295                 return false;
1296
1297         case EXPR_UNARY_NEGATE:
1298         case EXPR_UNARY_PLUS:
1299         case EXPR_UNARY_BITWISE_NEGATE:
1300         case EXPR_UNARY_NOT:
1301         case EXPR_UNARY_DEREFERENCE:
1302         case EXPR_UNARY_TAKE_ADDRESS:
1303         case EXPR_UNARY_CAST:
1304         case EXPR_UNARY_CAST_IMPLICIT:
1305                 return is_constant_expression(expression->unary.value);
1306
1307         case EXPR_BINARY_ADD:
1308         case EXPR_BINARY_SUB:
1309         case EXPR_BINARY_MUL:
1310         case EXPR_BINARY_DIV:
1311         case EXPR_BINARY_MOD:
1312         case EXPR_BINARY_EQUAL:
1313         case EXPR_BINARY_NOTEQUAL:
1314         case EXPR_BINARY_LESS:
1315         case EXPR_BINARY_LESSEQUAL:
1316         case EXPR_BINARY_GREATER:
1317         case EXPR_BINARY_GREATEREQUAL:
1318         case EXPR_BINARY_BITWISE_AND:
1319         case EXPR_BINARY_BITWISE_OR:
1320         case EXPR_BINARY_BITWISE_XOR:
1321         case EXPR_BINARY_LOGICAL_AND:
1322         case EXPR_BINARY_LOGICAL_OR:
1323         case EXPR_BINARY_SHIFTLEFT:
1324         case EXPR_BINARY_SHIFTRIGHT:
1325         case EXPR_BINARY_BUILTIN_EXPECT:
1326         case EXPR_BINARY_ISGREATER:
1327         case EXPR_BINARY_ISGREATEREQUAL:
1328         case EXPR_BINARY_ISLESS:
1329         case EXPR_BINARY_ISLESSEQUAL:
1330         case EXPR_BINARY_ISLESSGREATER:
1331         case EXPR_BINARY_ISUNORDERED:
1332                 return is_constant_expression(expression->binary.left)
1333                         && is_constant_expression(expression->binary.right);
1334
1335         case EXPR_CONDITIONAL:
1336                 /* TODO: not correct, we only have to test expressions which are
1337                  * evaluated, which means either the true or false part might be not
1338                  * constant */
1339                 return is_constant_expression(expression->conditional.condition)
1340                         && is_constant_expression(expression->conditional.true_expression)
1341                         && is_constant_expression(expression->conditional.false_expression);
1342
1343         case EXPR_ARRAY_ACCESS:
1344                 return is_constant_expression(expression->array_access.array_ref)
1345                         && is_constant_expression(expression->array_access.index);
1346
1347         case EXPR_REFERENCE: {
1348                 declaration_t *declaration = expression->reference.declaration;
1349                 if(declaration->storage_class == STORAGE_CLASS_ENUM_ENTRY)
1350                         return true;
1351
1352                 return false;
1353         }
1354
1355         case EXPR_UNKNOWN:
1356         case EXPR_INVALID:
1357                 break;
1358         }
1359         panic("invalid expression found (is constant expression)");
1360 }
1361
1362 /**
1363  * Initialize the AST construction.
1364  */
1365 void init_ast(void)
1366 {
1367         obstack_init(&ast_obstack);
1368 }
1369
1370 /**
1371  * Free the AST.
1372  */
1373 void exit_ast(void)
1374 {
1375         obstack_free(&ast_obstack, NULL);
1376 }
1377
1378 /**
1379  * Set the output stream for the AST printer.
1380  *
1381  * @param stream  the output stream
1382  */
1383 void ast_set_output(FILE *stream)
1384 {
1385         out = stream;
1386         type_set_output(stream);
1387 }
1388
1389 /**
1390  * Allocate an AST object of the given size.
1391  *
1392  * @param size  the size of the object to allocate
1393  *
1394  * @return  A new allocated object in the AST memeory space.
1395  */
1396 void *(allocate_ast)(size_t size)
1397 {
1398         return _allocate_ast(size);
1399 }