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