nsz Git - cparser/blob - ast2firm.c

   1 /*
   2  * This file is part of cparser.
   3  * Copyright (C) 2007-2008 Matthias Braun <matze@braunis.de>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  18  * 02111-1307, USA.
  19  */
  20 #include <config.h>
  21
  22 #include <assert.h>
  23 #include <string.h>
  24 #include <stdbool.h>
  25 #include <limits.h>
  26
  27 #include <libfirm/firm.h>
  28 #include <libfirm/adt/obst.h>
  29 #include <libfirm/be.h>
  30
  31 #include "ast2firm.h"
  32
  33 #include "adt/error.h"
  34 #include "adt/array.h"
  35 #include "adt/util.h"
  36 #include "symbol_t.h"
  37 #include "token_t.h"
  38 #include "type_t.h"
  39 #include "ast_t.h"
  40 #include "entity_t.h"
  41 #include "parser.h"
  42 #include "diagnostic.h"
  43 #include "lang_features.h"
  44 #include "types.h"
  45 #include "type_hash.h"
  46 #include "mangle.h"
  47 #include "walk_statements.h"
  48 #include "warning.h"
  49 #include "entitymap_t.h"
  50 #include "driver/firm_opt.h"
  51 #include "driver/firm_cmdline.h"
  52
  53 static ir_type *ir_type_const_char;
  54 static ir_type *ir_type_wchar_t;
  55 static ir_type *ir_type_void;
  56 static ir_type *ir_type_int;
  57
  58 /* architecture specific floating point arithmetic mode (if any) */
  59 static ir_mode *mode_float_arithmetic;
  60
  61 static int        next_value_number_function;
  62 static ir_node   *continue_label;
  63 static ir_node   *break_label;
  64 static ir_node   *current_switch_cond;
  65 static bool       saw_default_label;
  66 static label_t  **all_labels;
  67 static entity_t **inner_functions;
  68 static ir_node   *ijmp_list;
  69 static bool       constant_folding;
  70
  71 extern bool       have_const_functions;
  72
  73 static const entity_t     *current_function_entity;
  74 static ir_node            *current_function_name;
  75 static ir_node            *current_funcsig;
  76 static switch_statement_t *current_switch;
  77 static ir_graph           *current_function;
  78 static translation_unit_t *current_translation_unit;
  79
  80 static entitymap_t  entitymap;
  81
  82 static struct obstack asm_obst;
  83
  84 typedef enum declaration_kind_t {
  85         DECLARATION_KIND_UNKNOWN,
  86         DECLARATION_KIND_VARIABLE_LENGTH_ARRAY,
  87         DECLARATION_KIND_GLOBAL_VARIABLE,
  88         DECLARATION_KIND_LOCAL_VARIABLE,
  89         DECLARATION_KIND_LOCAL_VARIABLE_ENTITY,
  90         DECLARATION_KIND_PARAMETER,
  91         DECLARATION_KIND_PARAMETER_ENTITY,
  92         DECLARATION_KIND_FUNCTION,
  93         DECLARATION_KIND_COMPOUND_MEMBER,
  94         DECLARATION_KIND_INNER_FUNCTION
  95 } declaration_kind_t;
  96
  97 static ir_mode *get_ir_mode_storage(type_t *type);
  98 /*
  99  * get arithmetic mode for a type. This is different from get_ir_mode_storage,
 100  * int that it returns bigger modes for floating point on some platforms
 101  * (x87 internally does arithemtic with 80bits)
 102  */
 103 static ir_mode *get_ir_mode_arithmetic(type_t *type);
 104
 105 static ir_type *get_ir_type_incomplete(type_t *type);
 106
 107 static void enqueue_inner_function(entity_t *entity)
 108 {
 109         ARR_APP1(entity_t*, inner_functions, entity);
 110 }
 111
 112 static entity_t *next_inner_function(void)
 113 {
 114         int len = ARR_LEN(inner_functions);
 115         if (len == 0)
 116                 return NULL;
 117
 118         entity_t *entity = inner_functions[len-1];
 119         ARR_SHRINKLEN(inner_functions, len-1);
 120
 121         return entity;
 122 }
 123
 124 ir_node *uninitialized_local_var(ir_graph *irg, ir_mode *mode, int pos)
 125 {
 126         const entity_t *entity = get_irg_loc_description(irg, pos);
 127
 128         if (entity != NULL) {
 129                 warningf(&entity->base.source_position,
 130                          "%s '%#T' might be used uninitialized",
 131                          get_entity_kind_name(entity->kind),
 132                          entity->declaration.type, entity->base.symbol);
 133         }
 134         return new_r_Unknown(irg, mode);
 135 }
 136
 137 unsigned dbg_snprint(char *buf, unsigned len, const dbg_info *dbg)
 138 {
 139         const source_position_t *pos = (const source_position_t*) dbg;
 140         if (pos == NULL)
 141                 return 0;
 142         return (unsigned) snprintf(buf, len, "%s:%u", pos->input_name,
 143                                    pos->linenr);
 144 }
 145
 146 const char *dbg_retrieve(const dbg_info *dbg, unsigned *line)
 147 {
 148         const source_position_t *pos = (const source_position_t*) dbg;
 149         if (pos == NULL)
 150                 return NULL;
 151         if (line != NULL)
 152                 *line = pos->linenr;
 153         return pos->input_name;
 154 }
 155
 156 static dbg_info *get_dbg_info(const source_position_t *pos)
 157 {
 158         return (dbg_info*) pos;
 159 }
 160
 161 static ir_mode *atomic_modes[ATOMIC_TYPE_LAST+1];
 162
 163 static ir_mode *mode_int, *mode_uint;
 164
 165 static ir_node *_expression_to_firm(const expression_t *expression);
 166 static ir_node *expression_to_firm(const expression_t *expression);
 167 static void create_local_declaration(entity_t *entity);
 168
 169 static ir_mode *init_atomic_ir_mode(atomic_type_kind_t kind)
 170 {
 171         unsigned flags = get_atomic_type_flags(kind);
 172         unsigned size  = get_atomic_type_size(kind);
 173         if ( (flags & (ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_FLOAT))
 174                         && !(flags & ATOMIC_TYPE_FLAG_COMPLEX)) {
 175                 char            name[64];
 176                 ir_mode_sort    sort;
 177                 unsigned        bit_size     = size * 8;
 178                 bool            is_signed    = (flags & ATOMIC_TYPE_FLAG_SIGNED) != 0;
 179                 unsigned        modulo_shift;
 180                 ir_mode_arithmetic arithmetic;
 181
 182                 if (flags & ATOMIC_TYPE_FLAG_INTEGER) {
 183                         assert(! (flags & ATOMIC_TYPE_FLAG_FLOAT));
 184                         snprintf(name, sizeof(name), "%s%u", is_signed ? "I" : "U",
 185                                  bit_size);
 186                         sort         = irms_int_number;
 187                         arithmetic   = irma_twos_complement;
 188                         modulo_shift = bit_size < machine_size ? machine_size : bit_size;
 189                 } else {
 190                         assert(flags & ATOMIC_TYPE_FLAG_FLOAT);
 191                         snprintf(name, sizeof(name), "F%u", bit_size);
 192                         sort         = irms_float_number;
 193                         arithmetic   = irma_ieee754;
 194                         modulo_shift = 0;
 195                 }
 196                 return new_ir_mode(name, sort, bit_size, is_signed, arithmetic,
 197                                    modulo_shift);
 198         }
 199
 200         return NULL;
 201 }
 202
 203 /**
 204  * Initialises the atomic modes depending on the machine size.
 205  */
 206 static void init_atomic_modes(void)
 207 {
 208         for (int i = 0; i <= ATOMIC_TYPE_LAST; ++i) {
 209                 atomic_modes[i] = init_atomic_ir_mode((atomic_type_kind_t) i);
 210         }
 211         mode_int  = atomic_modes[ATOMIC_TYPE_INT];
 212         mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
 213
 214         /* there's no real void type in firm */
 215         atomic_modes[ATOMIC_TYPE_VOID] = atomic_modes[ATOMIC_TYPE_CHAR];
 216
 217         /* initialize pointer modes */
 218         char            name[64];
 219         ir_mode_sort    sort         = irms_reference;
 220         unsigned        bit_size     = machine_size;
 221         bool            is_signed    = 0;
 222         ir_mode_arithmetic arithmetic   = irma_twos_complement;
 223         unsigned        modulo_shift
 224                 = bit_size < machine_size ? machine_size : bit_size;
 225
 226         snprintf(name, sizeof(name), "p%u", machine_size);
 227         ir_mode *ptr_mode = new_ir_mode(name, sort, bit_size, is_signed, arithmetic,
 228                                         modulo_shift);
 229
 230         set_reference_mode_signed_eq(ptr_mode, atomic_modes[get_intptr_kind()]);
 231         set_reference_mode_unsigned_eq(ptr_mode, atomic_modes[get_uintptr_kind()]);
 232
 233         /* Hmm, pointers should be machine size */
 234         set_modeP_data(ptr_mode);
 235         set_modeP_code(ptr_mode);
 236 }
 237
 238 ir_mode *get_atomic_mode(atomic_type_kind_t kind)
 239 {
 240         assert(kind <= ATOMIC_TYPE_LAST);
 241         return atomic_modes[kind];
 242 }
 243
 244 static unsigned get_compound_type_size(compound_type_t *type)
 245 {
 246         ir_type *irtype = get_ir_type((type_t*) type);
 247         return get_type_size_bytes(irtype);
 248 }
 249
 250 static unsigned get_array_type_size(array_type_t *type)
 251 {
 252         assert(!type->is_vla);
 253         ir_type *irtype = get_ir_type((type_t*) type);
 254         return get_type_size_bytes(irtype);
 255 }
 256
 257 static unsigned get_type_size_const(type_t *type)
 258 {
 259         switch(type->kind) {
 260         case TYPE_ERROR:
 261                 panic("error type occurred");
 262         case TYPE_ATOMIC:
 263                 return get_atomic_type_size(type->atomic.akind);
 264         case TYPE_COMPLEX:
 265                 return 2 * get_atomic_type_size(type->complex.akind);
 266         case TYPE_IMAGINARY:
 267                 return get_atomic_type_size(type->imaginary.akind);
 268         case TYPE_ENUM:
 269                 return get_atomic_type_size(type->enumt.akind);
 270         case TYPE_COMPOUND_UNION:
 271         case TYPE_COMPOUND_STRUCT:
 272                 return get_compound_type_size(&type->compound);
 273         case TYPE_FUNCTION:
 274                 /* just a pointer to the function */
 275                 return get_mode_size_bytes(mode_P_code);
 276         case TYPE_POINTER:
 277         case TYPE_REFERENCE:
 278                 return get_mode_size_bytes(mode_P_data);
 279         case TYPE_ARRAY:
 280                 return get_array_type_size(&type->array);
 281         case TYPE_BUILTIN:
 282                 return get_type_size_const(type->builtin.real_type);
 283         case TYPE_BITFIELD:
 284                 panic("type size of bitfield request");
 285         case TYPE_TYPEDEF:
 286         case TYPE_TYPEOF:
 287         case TYPE_INVALID:
 288                 break;
 289         }
 290         panic("Trying to determine size of invalid type");
 291 }
 292
 293 static ir_node *get_vla_size(array_type_t *const type)
 294 {
 295         ir_node *size_node = type->size_node;
 296         if (size_node == NULL) {
 297                 size_node = expression_to_firm(type->size_expression);
 298                 type->size_node = size_node;
 299         }
 300         return size_node;
 301 }
 302
 303 static ir_node *get_type_size(type_t *type)
 304 {
 305         type = skip_typeref(type);
 306
 307         if (is_type_array(type) && type->array.is_vla) {
 308                 ir_node *size_node = get_vla_size(&type->array);
 309                 ir_node *elem_size = get_type_size(type->array.element_type);
 310                 ir_mode *mode      = get_irn_mode(size_node);
 311                 ir_node *real_size = new_d_Mul(NULL, size_node, elem_size, mode);
 312                 return real_size;
 313         }
 314
 315         ir_mode *mode = get_ir_mode_storage(type_size_t);
 316         symconst_symbol sym;
 317         sym.type_p = get_ir_type(type);
 318         return new_SymConst(mode, sym, symconst_type_size);
 319 }
 320
 321 static unsigned count_parameters(const function_type_t *function_type)
 322 {
 323         unsigned count = 0;
 324
 325         function_parameter_t *parameter = function_type->parameters;
 326         for ( ; parameter != NULL; parameter = parameter->next) {
 327                 ++count;
 328         }
 329
 330         return count;
 331 }
 332
 333 static type_t *get_aligned_type(type_t *type, int alignment)
 334 {
 335         if (alignment == 0)
 336                 return type;
 337
 338         type = skip_typeref(type);
 339         if (alignment > type->base.alignment) {
 340                 type_t *copy         = duplicate_type(type);
 341                 copy->base.alignment = alignment;
 342                 type                 = identify_new_type(copy);
 343         }
 344         return type;
 345 }
 346
 347 /**
 348  * Creates a Firm type for an atomic type
 349  */
 350 static ir_type *create_atomic_type(atomic_type_kind_t akind, int alignment)
 351 {
 352         ir_mode            *mode   = atomic_modes[akind];
 353         ident              *id     = get_mode_ident(mode);
 354         ir_type            *irtype = new_type_primitive(id, mode);
 355
 356         set_type_alignment_bytes(irtype, alignment);
 357
 358         return irtype;
 359 }
 360
 361 /**
 362  * Creates a Firm type for a complex type
 363  */
 364 static ir_type *create_complex_type(const complex_type_t *type)
 365 {
 366         atomic_type_kind_t  kind = type->akind;
 367         ir_mode            *mode = atomic_modes[kind];
 368         ident              *id   = get_mode_ident(mode);
 369
 370         (void) id;
 371
 372         /* FIXME: finish the array */
 373         return NULL;
 374 }
 375
 376 /**
 377  * Creates a Firm type for an imaginary type
 378  */
 379 static ir_type *create_imaginary_type(const imaginary_type_t *type)
 380 {
 381         atomic_type_kind_t  kind      = type->akind;
 382         ir_mode            *mode      = atomic_modes[kind];
 383         ident              *id        = get_mode_ident(mode);
 384         ir_type            *irtype    = new_type_primitive(id, mode);
 385
 386         set_type_alignment_bytes(irtype, type->base.alignment);
 387
 388         return irtype;
 389 }
 390
 391 /**
 392  * return type of a parameter (and take transparent union gnu extension into
 393  * account)
 394  */
 395 static type_t *get_parameter_type(type_t *type)
 396 {
 397         type = skip_typeref(type);
 398         if (type->base.modifiers & TYPE_MODIFIER_TRANSPARENT_UNION) {
 399                 compound_t *compound = type->compound.compound;
 400                 type                 = compound->members.entities->declaration.type;
 401         }
 402
 403         return type;
 404 }
 405
 406 static ir_type *create_method_type(const function_type_t *function_type)
 407 {
 408         type_t  *return_type  = skip_typeref(function_type->return_type);
 409
 410         ident   *id           = id_unique("functiontype.%u");
 411         int      n_parameters = count_parameters(function_type);
 412         int      n_results    = return_type == type_void ? 0 : 1;
 413         ir_type *irtype       = new_type_method(id, n_parameters, n_results);
 414
 415         if (return_type != type_void) {
 416                 ir_type *restype = get_ir_type(return_type);
 417                 set_method_res_type(irtype, 0, restype);
 418         }
 419
 420         function_parameter_t *parameter = function_type->parameters;
 421         int                   n         = 0;
 422         for ( ; parameter != NULL; parameter = parameter->next) {
 423                 type_t  *type     = get_parameter_type(parameter->type);
 424                 ir_type *p_irtype = get_ir_type(type);
 425                 set_method_param_type(irtype, n, p_irtype);
 426                 ++n;
 427         }
 428
 429         if (function_type->variadic || function_type->unspecified_parameters) {
 430                 set_method_variadicity(irtype, variadicity_variadic);
 431         }
 432
 433         unsigned cc = get_method_calling_convention(irtype);
 434         switch (function_type->calling_convention) {
 435         case CC_DEFAULT: /* unspecified calling convention, equal to one of the other, typically cdecl */
 436         case CC_CDECL:
 437 is_cdecl:
 438                 set_method_calling_convention(irtype, SET_CDECL(cc));
 439                 break;
 440
 441         case CC_STDCALL:
 442                 if (function_type->variadic || function_type->unspecified_parameters)
 443                         goto is_cdecl;
 444
 445                 /* only non-variadic function can use stdcall, else use cdecl */
 446                 set_method_calling_convention(irtype, SET_STDCALL(cc));
 447                 break;
 448
 449         case CC_FASTCALL:
 450                 if (function_type->variadic || function_type->unspecified_parameters)
 451                         goto is_cdecl;
 452                 /* only non-variadic function can use fastcall, else use cdecl */
 453                 set_method_calling_convention(irtype, SET_FASTCALL(cc));
 454                 break;
 455
 456         case CC_THISCALL:
 457                 /* Hmm, leave default, not accepted by the parser yet. */
 458                 break;
 459         }
 460
 461         return irtype;
 462 }
 463
 464 static ir_type *create_pointer_type(pointer_type_t *type)
 465 {
 466         type_t   *points_to    = type->points_to;
 467         ir_type  *ir_points_to = get_ir_type_incomplete(points_to);
 468         ir_type  *ir_type      = new_type_pointer(id_unique("pointer.%u"),
 469                                                   ir_points_to, mode_P_data);
 470
 471         return ir_type;
 472 }
 473
 474 static ir_type *create_reference_type(reference_type_t *type)
 475 {
 476         type_t  *refers_to    = type->refers_to;
 477         ir_type *ir_refers_to = get_ir_type_incomplete(refers_to);
 478         ir_type *ir_type      = new_type_pointer(id_unique("reference.%u"),
 479                                                  ir_refers_to, mode_P_data);
 480
 481         return ir_type;
 482 }
 483
 484 static ir_type *create_array_type(array_type_t *type)
 485 {
 486         type_t  *element_type    = type->element_type;
 487         ir_type *ir_element_type = get_ir_type(element_type);
 488
 489         ident    *id      = id_unique("array.%u");
 490         ir_type  *ir_type = new_type_array(id, 1, ir_element_type);
 491
 492         const int align = get_type_alignment_bytes(ir_element_type);
 493         set_type_alignment_bytes(ir_type, align);
 494
 495         if (type->size_constant) {
 496                 int n_elements = type->size;
 497
 498                 set_array_bounds_int(ir_type, 0, 0, n_elements);
 499
 500                 size_t elemsize = get_type_size_bytes(ir_element_type);
 501                 if (elemsize % align > 0) {
 502                         elemsize += align - (elemsize % align);
 503                 }
 504                 set_type_size_bytes(ir_type, n_elements * elemsize);
 505         } else {
 506                 set_array_lower_bound_int(ir_type, 0, 0);
 507         }
 508         set_type_state(ir_type, layout_fixed);
 509
 510         return ir_type;
 511 }
 512
 513 /**
 514  * Return the signed integer type of size bits.
 515  *
 516  * @param size   the size
 517  */
 518 static ir_type *get_signed_int_type_for_bit_size(ir_type *base_tp,
 519                                                  unsigned size)
 520 {
 521         static ir_mode *s_modes[64 + 1] = {NULL, };
 522         ir_type *res;
 523         ir_mode *mode;
 524
 525         if (size <= 0 || size > 64)
 526                 return NULL;
 527
 528         mode = s_modes[size];
 529         if (mode == NULL) {
 530                 char name[32];
 531
 532                 snprintf(name, sizeof(name), "bf_I%u", size);
 533                 mode = new_ir_mode(name, irms_int_number, size, 1, irma_twos_complement,
 534                                    size <= 32 ? 32 : size );
 535                 s_modes[size] = mode;
 536         }
 537
 538         char name[32];
 539         snprintf(name, sizeof(name), "I%u", size);
 540         ident *id = new_id_from_str(name);
 541         dbg_info *dbgi = get_dbg_info(&builtin_source_position);
 542         res = new_d_type_primitive(id_mangle_u(get_type_ident(base_tp), id), mode, dbgi);
 543         set_primitive_base_type(res, base_tp);
 544
 545         return res;
 546 }
 547
 548 /**
 549  * Return the unsigned integer type of size bits.
 550  *
 551  * @param size   the size
 552  */
 553 static ir_type *get_unsigned_int_type_for_bit_size(ir_type *base_tp,
 554                                                    unsigned size)
 555 {
 556         static ir_mode *u_modes[64 + 1] = {NULL, };
 557         ir_type *res;
 558         ir_mode *mode;
 559
 560         if (size <= 0 || size > 64)
 561                 return NULL;
 562
 563         mode = u_modes[size];
 564         if (mode == NULL) {
 565                 char name[32];
 566
 567                 snprintf(name, sizeof(name), "bf_U%u", size);
 568                 mode = new_ir_mode(name, irms_int_number, size, 0, irma_twos_complement,
 569                                    size <= 32 ? 32 : size );
 570                 u_modes[size] = mode;
 571         }
 572
 573         char name[32];
 574
 575         snprintf(name, sizeof(name), "U%u", size);
 576         ident *id = new_id_from_str(name);
 577         dbg_info *dbgi = get_dbg_info(&builtin_source_position);
 578         res = new_d_type_primitive(id_mangle_u(get_type_ident(base_tp), id), mode, dbgi);
 579         set_primitive_base_type(res, base_tp);
 580
 581         return res;
 582 }
 583
 584 static ir_type *create_bitfield_type(bitfield_type_t *const type)
 585 {
 586         type_t *base = skip_typeref(type->base_type);
 587         assert(base->kind == TYPE_ATOMIC || base->kind == TYPE_ENUM);
 588         ir_type *irbase = get_ir_type(base);
 589
 590         unsigned size = type->bit_size;
 591
 592         assert(!is_type_float(base));
 593         if (is_type_signed(base)) {
 594                 return get_signed_int_type_for_bit_size(irbase, size);
 595         } else {
 596                 return get_unsigned_int_type_for_bit_size(irbase, size);
 597         }
 598 }
 599
 600 #define INVALID_TYPE ((ir_type_ptr)-1)
 601
 602 enum {
 603         COMPOUND_IS_STRUCT = false,
 604         COMPOUND_IS_UNION  = true
 605 };
 606
 607 /**
 608  * Construct firm type from ast struct type.
 609  *
 610  * As anonymous inner structs get flattened to a single firm type, we might get
 611  * irtype, outer_offset and out_align passed (they represent the position of
 612  * the anonymous inner struct inside the resulting firm struct)
 613  */
 614 static ir_type *create_compound_type(compound_type_t *type, ir_type *irtype,
 615                                      size_t *outer_offset, size_t *outer_align,
 616                                      bool incomplete, bool is_union)
 617 {
 618         compound_t *compound = type->compound;
 619
 620         if (compound->irtype != NULL && (compound->irtype_complete || incomplete)) {
 621                 return compound->irtype;
 622         }
 623
 624         size_t align_all  = 1;
 625         size_t offset     = 0;
 626         size_t bit_offset = 0;
 627         size_t size       = 0;
 628
 629         if (irtype == NULL) {
 630                 symbol_t *symbol = compound->base.symbol;
 631                 ident    *id;
 632                 if (symbol != NULL) {
 633                         id = new_id_from_str(symbol->string);
 634                 } else {
 635                         if (is_union) {
 636                                 id = id_unique("__anonymous_union.%u");
 637                         } else {
 638                                 id = id_unique("__anonymous_struct.%u");
 639                         }
 640                 }
 641                 dbg_info *dbgi = get_dbg_info(&compound->base.source_position);
 642
 643                 if (is_union) {
 644                         irtype = new_d_type_union(id, dbgi);
 645                 } else {
 646                         irtype = new_d_type_struct(id, dbgi);
 647                 }
 648
 649                 compound->irtype_complete = false;
 650                 compound->irtype          = irtype;
 651         } else {
 652                 offset    = *outer_offset;
 653                 align_all = *outer_align;
 654         }
 655
 656         if (incomplete)
 657                 return irtype;
 658
 659         compound->irtype_complete = true;
 660
 661         entity_t *entry = compound->members.entities;
 662         for ( ; entry != NULL; entry = entry->base.next) {
 663                 if (entry->kind != ENTITY_COMPOUND_MEMBER)
 664                         continue;
 665
 666                 size_t prev_offset = offset;
 667
 668                 symbol_t *symbol     = entry->base.symbol;
 669                 type_t   *entry_type = skip_typeref(entry->declaration.type);
 670                 entry_type
 671                         = get_aligned_type(entry_type, entry->compound_member.alignment);
 672                 dbg_info *dbgi       = get_dbg_info(&entry->base.source_position);
 673
 674                 ident    *ident;
 675                 if (symbol != NULL) {
 676                         ident = new_id_from_str(symbol->string);
 677                 } else {
 678                         if (entry_type->kind == TYPE_COMPOUND_STRUCT) {
 679                                 create_compound_type(&entry_type->compound, irtype, &offset,
 680                                                      &align_all, false, COMPOUND_IS_STRUCT);
 681                                 goto finished_member;
 682                         } else if (entry_type->kind == TYPE_COMPOUND_UNION) {
 683                                 create_compound_type(&entry_type->compound, irtype, &offset,
 684                                                      &align_all, false, COMPOUND_IS_UNION);
 685                                 goto finished_member;
 686                         } else {
 687                                 assert(entry_type->kind == TYPE_BITFIELD);
 688                         }
 689                         ident = id_unique("anon.%u");
 690                 }
 691
 692                 ir_type *base_irtype;
 693                 if (entry_type->kind == TYPE_BITFIELD) {
 694                         base_irtype = get_ir_type(entry_type->bitfield.base_type);
 695                 } else {
 696                         base_irtype = get_ir_type(entry_type);
 697                 }
 698
 699                 size_t entry_alignment = get_type_alignment_bytes(base_irtype);
 700                 size_t misalign        = offset % entry_alignment;
 701
 702                 ir_type   *entry_irtype = get_ir_type(entry_type);
 703                 ir_entity *entity = new_d_entity(irtype, ident, entry_irtype, dbgi);
 704
 705                 size_t base;
 706                 size_t bits_remainder;
 707                 if (entry_type->kind == TYPE_BITFIELD) {
 708                         size_t size_bits      = entry_type->bitfield.bit_size;
 709                         size_t rest_size_bits = (entry_alignment - misalign)*8 - bit_offset;
 710
 711                         if (size_bits > rest_size_bits) {
 712                                 /* start a new bucket */
 713                                 offset     += entry_alignment - misalign;
 714                                 bit_offset  = 0;
 715
 716                                 base           = offset;
 717                                 bits_remainder = 0;
 718                         } else {
 719                                 /* put into current bucket */
 720                                 base           = offset - misalign;
 721                                 bits_remainder = misalign * 8 + bit_offset;
 722                         }
 723
 724                         offset     += size_bits / 8;
 725                         bit_offset  = bit_offset + (size_bits % 8);
 726                 } else {
 727                         size_t entry_size = get_type_size_bytes(base_irtype);
 728                         if (misalign > 0 || bit_offset > 0)
 729                                 offset += entry_alignment - misalign;
 730
 731                         base           = offset;
 732                         bits_remainder = 0;
 733                         offset        += entry_size;
 734                         bit_offset     = 0;
 735                 }
 736
 737                 if (entry_alignment > align_all) {
 738                         if (entry_alignment % align_all != 0) {
 739                                 panic("uneven alignments not supported yet");
 740                         }
 741                         align_all = entry_alignment;
 742                 }
 743
 744                 set_entity_offset(entity, base);
 745                 set_entity_offset_bits_remainder(entity,
 746                                                  (unsigned char) bits_remainder);
 747                 //add_struct_member(irtype, entity);
 748                 entry->declaration.kind = DECLARATION_KIND_COMPOUND_MEMBER;
 749                 assert(entry->compound_member.entity == NULL);
 750                 entry->compound_member.entity = entity;
 751
 752 finished_member:
 753                 if (is_union) {
 754                         size_t entry_size = offset - prev_offset;
 755                         if (entry_size > size) {
 756                                 size = entry_size;
 757                         }
 758                         offset     = 0;
 759                         bit_offset = 0;
 760                 }
 761         }
 762
 763         if (!is_union) {
 764                 size = offset;
 765         }
 766
 767         size_t misalign = offset % align_all;
 768         if (misalign > 0 || bit_offset > 0) {
 769                 size += align_all - misalign;
 770         }
 771
 772         if (outer_offset != NULL) {
 773                 if (!is_union) {
 774                         *outer_offset = offset;
 775                 } else {
 776                         *outer_offset += size;
 777                 }
 778
 779                 if (align_all > *outer_align) {
 780                         if (align_all % *outer_align != 0) {
 781                                 panic("uneven alignments not supported yet");
 782                         }
 783                         *outer_align = align_all;
 784                 }
 785         } else {
 786                 set_type_alignment_bytes(irtype, align_all);
 787                 set_type_size_bytes(irtype, size);
 788                 set_type_state(irtype, layout_fixed);
 789         }
 790
 791         return irtype;
 792 }
 793
 794 static ir_type *create_enum_type(enum_type_t *const type)
 795 {
 796         type->base.firm_type = ir_type_int;
 797
 798         ir_mode *const mode    = mode_int;
 799         tarval  *const one     = get_mode_one(mode);
 800         tarval  *      tv_next = get_tarval_null(mode);
 801
 802         bool constant_folding_old = constant_folding;
 803         constant_folding = true;
 804
 805         enum_t   *enume = type->enume;
 806         entity_t *entry = enume->base.next;
 807         for (; entry != NULL; entry = entry->base.next) {
 808                 if (entry->kind != ENTITY_ENUM_VALUE)
 809                         break;
 810
 811                 expression_t *const init = entry->enum_value.value;
 812                 if (init != NULL) {
 813                         ir_node *const cnst = expression_to_firm(init);
 814                         if (!is_Const(cnst)) {
 815                                 panic("couldn't fold constant");
 816                         }
 817                         tv_next = get_Const_tarval(cnst);
 818                 }
 819                 entry->enum_value.tv = tv_next;
 820                 tv_next = tarval_add(tv_next, one);
 821         }
 822
 823         constant_folding = constant_folding_old;
 824
 825         return create_atomic_type(type->akind, type->base.alignment);
 826 }
 827
 828 static ir_type *get_ir_type_incomplete(type_t *type)
 829 {
 830         assert(type != NULL);
 831         type = skip_typeref(type);
 832
 833         if (type->base.firm_type != NULL) {
 834                 assert(type->base.firm_type != INVALID_TYPE);
 835                 return type->base.firm_type;
 836         }
 837
 838         switch (type->kind) {
 839         case TYPE_COMPOUND_STRUCT:
 840                 return create_compound_type(&type->compound, NULL, NULL, NULL,
 841                                             true, COMPOUND_IS_STRUCT);
 842         case TYPE_COMPOUND_UNION:
 843                 return create_compound_type(&type->compound, NULL, NULL, NULL,
 844                                             true, COMPOUND_IS_UNION);
 845         default:
 846                 return get_ir_type(type);
 847         }
 848 }
 849
 850 ir_type *get_ir_type(type_t *type)
 851 {
 852         assert(type != NULL);
 853
 854         type = skip_typeref(type);
 855
 856         if (type->base.firm_type != NULL) {
 857                 assert(type->base.firm_type != INVALID_TYPE);
 858                 return type->base.firm_type;
 859         }
 860
 861         ir_type *firm_type = NULL;
 862         switch (type->kind) {
 863         case TYPE_ERROR:
 864                 /* Happens while constant folding, when there was an error */
 865                 return create_atomic_type(ATOMIC_TYPE_VOID, 0);
 866
 867         case TYPE_ATOMIC:
 868                 firm_type = create_atomic_type(type->atomic.akind,
 869                                                type->base.alignment);
 870                 break;
 871         case TYPE_COMPLEX:
 872                 firm_type = create_complex_type(&type->complex);
 873                 break;
 874         case TYPE_IMAGINARY:
 875                 firm_type = create_imaginary_type(&type->imaginary);
 876                 break;
 877         case TYPE_FUNCTION:
 878                 firm_type = create_method_type(&type->function);
 879                 break;
 880         case TYPE_POINTER:
 881                 firm_type = create_pointer_type(&type->pointer);
 882                 break;
 883         case TYPE_REFERENCE:
 884                 firm_type = create_reference_type(&type->reference);
 885                 break;
 886         case TYPE_ARRAY:
 887                 firm_type = create_array_type(&type->array);
 888                 break;
 889         case TYPE_COMPOUND_STRUCT:
 890                 firm_type = create_compound_type(&type->compound, NULL, NULL, NULL,
 891                                                  false, COMPOUND_IS_STRUCT);
 892                 break;
 893         case TYPE_COMPOUND_UNION:
 894                 firm_type = create_compound_type(&type->compound, NULL, NULL, NULL,
 895                                                  false, COMPOUND_IS_UNION);
 896                 break;
 897         case TYPE_ENUM:
 898                 firm_type = create_enum_type(&type->enumt);
 899                 break;
 900         case TYPE_BUILTIN:
 901                 firm_type = get_ir_type(type->builtin.real_type);
 902                 break;
 903         case TYPE_BITFIELD:
 904                 firm_type = create_bitfield_type(&type->bitfield);
 905                 break;
 906
 907         case TYPE_TYPEOF:
 908         case TYPE_TYPEDEF:
 909         case TYPE_INVALID:
 910                 break;
 911         }
 912         if (firm_type == NULL)
 913                 panic("unknown type found");
 914
 915         type->base.firm_type = firm_type;
 916         return firm_type;
 917 }
 918
 919 static ir_mode *get_ir_mode_storage(type_t *type)
 920 {
 921         ir_type *irtype = get_ir_type(type);
 922
 923         /* firm doesn't report a mode for arrays somehow... */
 924         if (is_Array_type(irtype)) {
 925                 return mode_P_data;
 926         }
 927
 928         ir_mode *mode = get_type_mode(irtype);
 929         assert(mode != NULL);
 930         return mode;
 931 }
 932
 933 static ir_mode *get_ir_mode_arithmetic(type_t *type)
 934 {
 935         ir_mode *mode = get_ir_mode_storage(type);
 936         if (mode_is_float(mode) && mode_float_arithmetic != NULL) {
 937                 return mode_float_arithmetic;
 938         }
 939
 940         return mode;
 941 }
 942
 943 /** Names of the runtime functions. */
 944 static const struct {
 945         int        id;           /**< the rts id */
 946         int        n_res;        /**< number of return values */
 947         const char *name;        /**< the name of the rts function */
 948         int        n_params;     /**< number of parameters */
 949         unsigned   flags;        /**< language flags */
 950 } rts_data[] = {
 951         { rts_debugbreak, 0, "__debugbreak", 0, _MS },
 952         { rts_abort,      0, "abort",        0, _C89 },
 953         { rts_alloca,     1, "alloca",       1, _ALL },
 954         { rts_abs,        1, "abs",          1, _C89 },
 955         { rts_labs,       1, "labs",         1, _C89 },
 956         { rts_llabs,      1, "llabs",        1, _C99 },
 957         { rts_imaxabs,    1, "imaxabs",      1, _C99 },
 958
 959         { rts_fabs,       1, "fabs",         1, _C89 },
 960         { rts_sqrt,       1, "sqrt",         1, _C89 },
 961         { rts_cbrt,       1, "cbrt",         1, _C99 },
 962         { rts_exp,        1, "exp",          1, _C89 },
 963         { rts_exp2,       1, "exp2",         1, _C89 },
 964         { rts_exp10,      1, "exp10",        1, _GNUC },
 965         { rts_log,        1, "log",          1, _C89 },
 966         { rts_log2,       1, "log2",         1, _C89 },
 967         { rts_log10,      1, "log10",        1, _C89 },
 968         { rts_pow,        1, "pow",          2, _C89 },
 969         { rts_sin,        1, "sin",          1, _C89 },
 970         { rts_cos,        1, "cos",          1, _C89 },
 971         { rts_tan,        1, "tan",          1, _C89 },
 972         { rts_asin,       1, "asin",         1, _C89 },
 973         { rts_acos,       1, "acos",         1, _C89 },
 974         { rts_atan,       1, "atan",         1, _C89 },
 975         { rts_sinh,       1, "sinh",         1, _C89 },
 976         { rts_cosh,       1, "cosh",         1, _C89 },
 977         { rts_tanh,       1, "tanh",         1, _C89 },
 978
 979         { rts_fabsf,      1, "fabsf",        1, _C99 },
 980         { rts_sqrtf,      1, "sqrtf",        1, _C99 },
 981         { rts_cbrtf,      1, "cbrtf",        1, _C99 },
 982         { rts_expf,       1, "expf",         1, _C99 },
 983         { rts_exp2f,      1, "exp2f",        1, _C99 },
 984         { rts_exp10f,     1, "exp10f",       1, _GNUC },
 985         { rts_logf,       1, "logf",         1, _C99 },
 986         { rts_log2f,      1, "log2f",        1, _C99 },
 987         { rts_log10f,     1, "log10f",       1, _C99 },
 988         { rts_powf,       1, "powf",         2, _C99 },
 989         { rts_sinf,       1, "sinf",         1, _C99 },
 990         { rts_cosf,       1, "cosf",         1, _C99 },
 991         { rts_tanf,       1, "tanf",         1, _C99 },
 992         { rts_asinf,      1, "asinf",        1, _C99 },
 993         { rts_acosf,      1, "acosf",        1, _C99 },
 994         { rts_atanf,      1, "atanf",        1, _C99 },
 995         { rts_sinhf,      1, "sinhf",        1, _C99 },
 996         { rts_coshf,      1, "coshf",        1, _C99 },
 997         { rts_tanhf,      1, "tanhf",        1, _C99 },
 998
 999         { rts_fabsl,      1, "fabsl",        1, _C99 },
1000         { rts_sqrtl,      1, "sqrtl",        1, _C99 },
1001         { rts_cbrtl,      1, "cbrtl",        1, _C99 },
1002         { rts_expl,       1, "expl",         1, _C99 },
1003         { rts_exp2l,      1, "exp2l",        1, _C99 },
1004         { rts_exp10l,     1, "exp10l",       1, _GNUC },
1005         { rts_logl,       1, "logl",         1, _C99 },
1006         { rts_log2l,      1, "log2l",        1, _C99 },
1007         { rts_log10l,     1, "log10l",       1, _C99 },
1008         { rts_powl,       1, "powl",         2, _C99 },
1009         { rts_sinl,       1, "sinl",         1, _C99 },
1010         { rts_cosl,       1, "cosl",         1, _C99 },
1011         { rts_tanl,       1, "tanl",         1, _C99 },
1012         { rts_asinl,      1, "asinl",        1, _C99 },
1013         { rts_acosl,      1, "acosl",        1, _C99 },
1014         { rts_atanl,      1, "atanl",        1, _C99 },
1015         { rts_sinhl,      1, "sinhl",        1, _C99 },
1016         { rts_coshl,      1, "coshl",        1, _C99 },
1017         { rts_tanhl,      1, "tanhl",        1, _C99 },
1018
1019         { rts_memcpy,     1, "memcpy",       3, _C89 },  /* HMM, man say its C99 */
1020         { rts_memset,     1, "memset",       3, _C89 },  /* HMM, man say its C99 */
1021         { rts_strcmp,     1, "strcmp",       2, _C89 },
1022         { rts_strncmp,    1, "strncmp",      3, _C89 }
1023 };
1024
1025 static ident *rts_idents[lengthof(rts_data)];
1026
1027 static ident* (*create_ld_ident)(entity_t*) = create_name_linux_elf;
1028
1029 /**
1030  * Handle GNU attributes for entities
1031  *
1032  * @param ent   the entity
1033  * @param decl  the routine declaration
1034  */
1035 static void handle_gnu_attributes_ent(ir_entity *irentity, entity_t *entity)
1036 {
1037         assert(is_declaration(entity));
1038         decl_modifiers_t modifiers = entity->declaration.modifiers;
1039         if (modifiers & DM_PURE) {
1040                 /* TRUE if the declaration includes the GNU
1041                    __attribute__((pure)) specifier. */
1042                 set_entity_additional_property(irentity, mtp_property_pure);
1043         }
1044         if (modifiers & DM_CONST) {
1045                 set_entity_additional_property(irentity, mtp_property_const);
1046                 have_const_functions = true;
1047         }
1048         if (modifiers & DM_USED) {
1049                 /* TRUE if the declaration includes the GNU
1050                    __attribute__((used)) specifier. */
1051                 set_entity_stickyness(irentity, stickyness_sticky);
1052         }
1053 }
1054
1055 static bool is_main(entity_t *entity)
1056 {
1057         static symbol_t *sym_main = NULL;
1058         if (sym_main == NULL) {
1059                 sym_main = symbol_table_insert("main");
1060         }
1061
1062         if (entity->base.symbol != sym_main)
1063                 return false;
1064         /* must be in outermost scope */
1065         if (entity->base.parent_scope != &current_translation_unit->scope)
1066                 return false;
1067
1068         return true;
1069 }
1070
1071 /**
1072  * Creates an entity representing a function.
1073  *
1074  * @param declaration  the function declaration
1075  */
1076 static ir_entity *get_function_entity(entity_t *entity)
1077 {
1078         assert(entity->kind == ENTITY_FUNCTION);
1079         if (entity->function.entity != NULL) {
1080                 return entity->function.entity;
1081         }
1082
1083         if (is_main(entity)) {
1084                 /* force main to C linkage */
1085                 type_t *type = entity->declaration.type;
1086                 assert(is_type_function(type));
1087                 if (type->function.linkage != LINKAGE_C) {
1088                         type_t *new_type           = duplicate_type(type);
1089                         new_type->function.linkage = LINKAGE_C;
1090                         type                       = identify_new_type(new_type);
1091                         entity->declaration.type   = type;
1092                 }
1093         }
1094
1095         symbol_t *symbol = entity->base.symbol;
1096         ident    *id     = new_id_from_str(symbol->string);
1097
1098         ir_type   *global_type    = get_glob_type();
1099         ir_type   *ir_type_method = get_ir_type(entity->declaration.type);
1100         bool const has_body       = entity->function.statement != NULL;
1101
1102         /* already an entity defined? */
1103         ir_entity *irentity = entitymap_get(&entitymap, symbol);
1104         if (irentity != NULL) {
1105                 if (get_entity_visibility(irentity) == visibility_external_allocated
1106                                 && has_body) {
1107                         set_entity_visibility(irentity, visibility_external_visible);
1108                 }
1109                 goto entity_created;
1110         }
1111
1112         dbg_info *const dbgi = get_dbg_info(&entity->base.source_position);
1113         irentity             = new_d_entity(global_type, id, ir_type_method, dbgi);
1114         set_entity_ld_ident(irentity, create_ld_ident(entity));
1115
1116         handle_gnu_attributes_ent(irentity, entity);
1117
1118         /* static inline             => local
1119          * extern inline             => local
1120          * inline without definition => local
1121          * inline with definition    => external_visible */
1122         storage_class_tag_t const storage_class
1123                 = (storage_class_tag_t) entity->declaration.storage_class;
1124         bool                const is_inline     = entity->function.is_inline;
1125         if (is_inline && storage_class == STORAGE_CLASS_NONE && has_body) {
1126                 set_entity_visibility(irentity, visibility_external_visible);
1127         } else if (storage_class == STORAGE_CLASS_STATIC ||
1128                    (is_inline && has_body)) {
1129                 if (!has_body) {
1130                         /* this entity was declared, but is defined nowhere */
1131                         set_entity_peculiarity(irentity, peculiarity_description);
1132                 }
1133                 set_entity_visibility(irentity, visibility_local);
1134         } else if (has_body) {
1135                 set_entity_visibility(irentity, visibility_external_visible);
1136         } else {
1137                 set_entity_visibility(irentity, visibility_external_allocated);
1138         }
1139         set_entity_allocation(irentity, allocation_static);
1140
1141         /* We should check for file scope here, but as long as we compile C only
1142            this is not needed. */
1143         if (! firm_opt.freestanding) {
1144                 /* check for a known runtime function */
1145                 for (size_t i = 0; i < lengthof(rts_data); ++i) {
1146                         if (id != rts_idents[i])
1147                                 continue;
1148
1149                         /* ignore those rts functions not necessary needed for current mode */
1150                         if ((c_mode & rts_data[i].flags) == 0)
1151                                 continue;
1152                         assert(rts_entities[rts_data[i].id] == NULL);
1153                         rts_entities[rts_data[i].id] = irentity;
1154                 }
1155         }
1156
1157         entitymap_insert(&entitymap, symbol, irentity);
1158
1159 entity_created:
1160         entity->declaration.kind = DECLARATION_KIND_FUNCTION;
1161         entity->function.entity  = irentity;
1162
1163         return irentity;
1164 }
1165
1166 static ir_node *create_conv(dbg_info *dbgi, ir_node *value, ir_mode *dest_mode)
1167 {
1168         ir_mode *value_mode = get_irn_mode(value);
1169
1170         if (value_mode == dest_mode || is_Bad(value))
1171                 return value;
1172
1173         if (dest_mode == mode_b) {
1174                 ir_node *zero = new_Const(get_mode_null(value_mode));
1175                 ir_node *cmp  = new_d_Cmp(dbgi, value, zero);
1176                 ir_node *proj = new_d_Proj(dbgi, cmp, mode_b, pn_Cmp_Lg);
1177                 return proj;
1178         }
1179
1180         return new_d_Conv(dbgi, value, dest_mode);
1181 }
1182
1183 /**
1184  * Creates a Const node representing a constant.
1185  */
1186 static ir_node *const_to_firm(const const_expression_t *cnst)
1187 {
1188         dbg_info *dbgi = get_dbg_info(&cnst->base.source_position);
1189         type_t   *type = skip_typeref(cnst->base.type);
1190         ir_mode  *mode = get_ir_mode_storage(type);
1191
1192         char    buf[128];
1193         tarval *tv;
1194         size_t  len;
1195         if (mode_is_float(mode)) {
1196                 tv = new_tarval_from_double(cnst->v.float_value, mode);
1197         } else {
1198                 if (mode_is_signed(mode)) {
1199                         len = snprintf(buf, sizeof(buf), "%lld", cnst->v.int_value);
1200                 } else {
1201                         len = snprintf(buf, sizeof(buf), "%llu",
1202                                        (unsigned long long) cnst->v.int_value);
1203                 }
1204                 tv = new_tarval_from_str(buf, len, mode);
1205         }
1206
1207         ir_node *res        = new_d_Const(dbgi, tv);
1208         ir_mode *mode_arith = get_ir_mode_arithmetic(type);
1209         return create_conv(dbgi, res, mode_arith);
1210 }
1211
1212 /**
1213  * Creates a Const node representing a character constant.
1214  */
1215 static ir_node *character_constant_to_firm(const const_expression_t *cnst)
1216 {
1217         dbg_info *dbgi = get_dbg_info(&cnst->base.source_position);
1218         ir_mode  *mode = get_ir_mode_arithmetic(cnst->base.type);
1219
1220         long long int v;
1221         size_t const  size = cnst->v.character.size;
1222         if (size == 1 && char_is_signed) {
1223                 v = (signed char)cnst->v.character.begin[0];
1224         } else {
1225                 v = 0;
1226                 for (size_t i = 0; i < size; ++i) {
1227                         v = (v << 8) | ((unsigned char)cnst->v.character.begin[i]);
1228                 }
1229         }
1230         char    buf[128];
1231         size_t  len = snprintf(buf, sizeof(buf), "%lld", v);
1232         tarval *tv = new_tarval_from_str(buf, len, mode);
1233
1234         return new_d_Const(dbgi, tv);
1235 }
1236
1237 /**
1238  * Creates a Const node representing a wide character constant.
1239  */
1240 static ir_node *wide_character_constant_to_firm(const const_expression_t *cnst)
1241 {
1242         dbg_info *dbgi = get_dbg_info(&cnst->base.source_position);
1243         ir_mode  *mode = get_ir_mode_arithmetic(cnst->base.type);
1244
1245         long long int v = cnst->v.wide_character.begin[0];
1246
1247         char    buf[128];
1248         size_t  len = snprintf(buf, sizeof(buf), "%lld", v);
1249         tarval *tv = new_tarval_from_str(buf, len, mode);
1250
1251         return new_d_Const(dbgi, tv);
1252 }
1253
1254 /**
1255  * Creates a SymConst for a given entity.
1256  *
1257  * @param dbgi    debug info
1258  * @param mode    the (reference) mode for the SymConst
1259  * @param entity  the entity
1260  */
1261 static ir_node *create_symconst(dbg_info *dbgi, ir_mode *mode,
1262                               ir_entity *entity)
1263 {
1264         assert(entity != NULL);
1265         union symconst_symbol sym;
1266         sym.entity_p = entity;
1267         return new_d_SymConst(dbgi, mode, sym, symconst_addr_ent);
1268 }
1269
1270 /**
1271  * Creates a SymConst node representing a string constant.
1272  *
1273  * @param src_pos    the source position of the string constant
1274  * @param id_prefix  a prefix for the name of the generated string constant
1275  * @param value      the value of the string constant
1276  */
1277 static ir_node *string_to_firm(const source_position_t *const src_pos,
1278                                const char *const id_prefix,
1279                                const string_t *const value)
1280 {
1281         ir_type  *const global_type = get_glob_type();
1282         dbg_info *const dbgi        = get_dbg_info(src_pos);
1283         ir_type  *const type        = new_d_type_array(id_unique("strtype.%u"), 1,
1284                                                        ir_type_const_char, dbgi);
1285
1286         ident     *const id     = id_unique(id_prefix);
1287         ir_entity *const entity = new_d_entity(global_type, id, type, dbgi);
1288         set_entity_ld_ident(entity, id);
1289         set_entity_variability(entity, variability_constant);
1290         set_entity_allocation(entity, allocation_static);
1291
1292         ir_type *const elem_type = ir_type_const_char;
1293         ir_mode *const mode      = get_type_mode(elem_type);
1294
1295         const char* const string = value->begin;
1296         const size_t      slen   = value->size;
1297
1298         set_array_lower_bound_int(type, 0, 0);
1299         set_array_upper_bound_int(type, 0, slen);
1300         set_type_size_bytes(type, slen);
1301         set_type_state(type, layout_fixed);
1302
1303         tarval **const tvs = xmalloc(slen * sizeof(tvs[0]));
1304         for (size_t i = 0; i < slen; ++i) {
1305                 tvs[i] = new_tarval_from_long(string[i], mode);
1306         }
1307
1308         set_array_entity_values(entity, tvs, slen);
1309         free(tvs);
1310
1311         return create_symconst(dbgi, mode_P_data, entity);
1312 }
1313
1314 /**
1315  * Creates a SymConst node representing a string literal.
1316  *
1317  * @param literal   the string literal
1318  */
1319 static ir_node *string_literal_to_firm(
1320                 const string_literal_expression_t* literal)
1321 {
1322         return string_to_firm(&literal->base.source_position, "Lstr.%u",
1323                               &literal->value);
1324 }
1325
1326 /**
1327  * Creates a SymConst node representing a wide string literal.
1328  *
1329  * @param literal   the wide string literal
1330  */
1331 static ir_node *wide_string_literal_to_firm(
1332         const wide_string_literal_expression_t* const literal)
1333 {
1334         ir_type *const global_type = get_glob_type();
1335         ir_type *const elem_type   = ir_type_wchar_t;
1336         dbg_info *const dbgi       = get_dbg_info(&literal->base.source_position);
1337         ir_type *const type        = new_d_type_array(id_unique("strtype.%u"), 1,
1338                                                     elem_type, dbgi);
1339
1340         ident     *const id     = id_unique("Lstr.%u");
1341         ir_entity *const entity = new_d_entity(global_type, id, type, dbgi);
1342         set_entity_ld_ident(entity, id);
1343         set_entity_variability(entity, variability_constant);
1344         set_entity_allocation(entity, allocation_static);
1345
1346         ir_mode *const mode      = get_type_mode(elem_type);
1347
1348         const wchar_rep_t *const string = literal->value.begin;
1349         const size_t             slen   = literal->value.size;
1350
1351         set_array_lower_bound_int(type, 0, 0);
1352         set_array_upper_bound_int(type, 0, slen);
1353         set_type_size_bytes(type, slen);
1354         set_type_state(type, layout_fixed);
1355
1356         tarval **const tvs = xmalloc(slen * sizeof(tvs[0]));
1357         for (size_t i = 0; i < slen; ++i) {
1358                 tvs[i] = new_tarval_from_long(string[i], mode);
1359         }
1360
1361         set_array_entity_values(entity, tvs, slen);
1362         free(tvs);
1363
1364         return create_symconst(dbgi, mode_P_data, entity);
1365 }
1366
1367 static ir_node *deref_address(dbg_info *const dbgi, type_t *const type,
1368                                       ir_node *const addr)
1369 {
1370         ir_type *irtype = get_ir_type(type);
1371         if (is_compound_type(irtype)
1372                         || is_Method_type(irtype)
1373                         || is_Array_type(irtype)) {
1374                 return addr;
1375         }
1376
1377         ir_cons_flags  flags    = type->base.qualifiers & TYPE_QUALIFIER_VOLATILE
1378                                   ? cons_volatile : cons_none;
1379         ir_mode *const mode     = get_type_mode(irtype);
1380         ir_node *const memory   = get_store();
1381         ir_node *const load     = new_d_Load(dbgi, memory, addr, mode, flags);
1382         ir_node *const load_mem = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1383         ir_node *const load_res = new_d_Proj(dbgi, load, mode,   pn_Load_res);
1384
1385         set_store(load_mem);
1386
1387         ir_mode *const mode_arithmetic = get_ir_mode_arithmetic(type);
1388         return create_conv(dbgi, load_res, mode_arithmetic);
1389 }
1390
1391 /**
1392  * Creates a strict Conv if necessary.
1393  */
1394 static ir_node *do_strict_conv(dbg_info *dbgi, ir_node *node)
1395 {
1396         ir_mode *mode = get_irn_mode(node);
1397
1398         if (!(get_irg_fp_model(current_ir_graph) & fp_explicit_rounding))
1399                 return node;
1400         if (!mode_is_float(mode))
1401                 return node;
1402
1403         /* check if there is already a Conv */
1404         if (is_Conv(node)) {
1405                 /* convert it into a strict Conv */
1406                 set_Conv_strict(node, 1);
1407                 return node;
1408         }
1409
1410         /* otherwise create a new one */
1411         return new_d_strictConv(dbgi, node, mode);
1412 }
1413
1414 static ir_node *get_global_var_address(dbg_info *const dbgi,
1415                                        const entity_t *const entity)
1416 {
1417         assert(entity->kind == ENTITY_VARIABLE);
1418         assert(entity->declaration.kind == DECLARATION_KIND_GLOBAL_VARIABLE);
1419
1420         ir_entity *const irentity = entity->variable.v.entity;
1421         if (entity->variable.thread_local) {
1422                 ir_node *const no_mem = new_NoMem();
1423                 ir_node *const tls    = get_irg_tls(current_ir_graph);
1424                 return new_d_simpleSel(dbgi, no_mem, tls, irentity);
1425         } else {
1426                 return create_symconst(dbgi, mode_P_data, irentity);
1427         }
1428 }
1429
1430 /**
1431  * Returns the correct base address depending on whether it is a parameter or a
1432  * normal local variable.
1433  */
1434 static ir_node *get_local_frame(ir_entity *const ent)
1435 {
1436         ir_graph      *const irg   = current_ir_graph;
1437         const ir_type *const owner = get_entity_owner(ent);
1438         if (owner == get_irg_frame_type(irg)) {
1439                 return get_irg_frame(irg);
1440         } else {
1441                 assert(owner == get_method_value_param_type(get_entity_type(get_irg_entity(irg))));
1442                 return get_irg_value_param_base(irg);
1443         }
1444 }
1445
1446 /**
1447  * Keep all memory edges of the given block.
1448  */
1449 static void keep_all_memory(ir_node *block)
1450 {
1451         ir_node *old = get_cur_block();
1452
1453         set_cur_block(block);
1454         keep_alive(get_store());
1455         /* TODO: keep all memory edges from restricted pointers */
1456         set_cur_block(old);
1457 }
1458
1459 static ir_node *reference_expression_enum_value_to_firm(
1460                 const reference_expression_t *ref)
1461 {
1462         entity_t *entity = ref->entity;
1463         type_t   *type   = skip_typeref(entity->enum_value.enum_type);
1464         /* make sure the type is constructed */
1465         (void) get_ir_type(type);
1466
1467         return new_Const(entity->enum_value.tv);
1468 }
1469
1470 static ir_node *reference_expression_to_firm(const reference_expression_t *ref)
1471 {
1472         dbg_info *dbgi   = get_dbg_info(&ref->base.source_position);
1473         entity_t *entity = ref->entity;
1474         assert(is_declaration(entity));
1475         type_t   *type   = skip_typeref(entity->declaration.type);
1476
1477         /* make sure the type is constructed */
1478         (void) get_ir_type(type);
1479
1480         switch ((declaration_kind_t) entity->declaration.kind) {
1481         case DECLARATION_KIND_UNKNOWN:
1482                 break;
1483
1484         case DECLARATION_KIND_LOCAL_VARIABLE: {
1485                 ir_mode *const mode  = get_ir_mode_storage(type);
1486                 ir_node *const value = get_value(entity->variable.v.value_number, mode);
1487                 return create_conv(NULL, value, get_ir_mode_arithmetic(type));
1488         }
1489         case DECLARATION_KIND_PARAMETER: {
1490                 ir_mode *const mode  = get_ir_mode_storage(type);
1491                 ir_node *const value = get_value(entity->parameter.v.value_number,mode);
1492                 return create_conv(NULL, value, get_ir_mode_arithmetic(type));
1493         }
1494         case DECLARATION_KIND_FUNCTION: {
1495                 ir_mode *const mode = get_ir_mode_storage(type);
1496                 return create_symconst(dbgi, mode, entity->function.entity);
1497         }
1498         case DECLARATION_KIND_INNER_FUNCTION: {
1499                 ir_mode *const mode = get_ir_mode_storage(type);
1500                 if (!entity->function.goto_to_outer && !entity->function.need_closure) {
1501                         /* inner function not using the closure */
1502                         return create_symconst(dbgi, mode, entity->function.entity);
1503                 } else {
1504                         /* TODO: need trampoline here */
1505                         panic("Trampoline code not implemented");
1506                         return create_symconst(dbgi, mode, entity->function.entity);
1507                 }
1508         }
1509         case DECLARATION_KIND_GLOBAL_VARIABLE: {
1510                 ir_node *const addr = get_global_var_address(dbgi, entity);
1511                 return deref_address(dbgi, entity->declaration.type, addr);
1512         }
1513
1514         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY: {
1515                 ir_entity *irentity = entity->variable.v.entity;
1516                 ir_node   *frame    = get_local_frame(irentity);
1517                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1518                 return deref_address(dbgi, entity->declaration.type, sel);
1519         }
1520         case DECLARATION_KIND_PARAMETER_ENTITY: {
1521                 ir_entity *irentity = entity->parameter.v.entity;
1522                 ir_node   *frame    = get_local_frame(irentity);
1523                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1524                 return deref_address(dbgi, entity->declaration.type, sel);
1525         }
1526
1527         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
1528                 return entity->variable.v.vla_base;
1529
1530         case DECLARATION_KIND_COMPOUND_MEMBER:
1531                 panic("not implemented reference type");
1532         }
1533
1534         panic("reference to declaration with unknown type found");
1535 }
1536
1537 static ir_node *reference_addr(const reference_expression_t *ref)
1538 {
1539         dbg_info *dbgi   = get_dbg_info(&ref->base.source_position);
1540         entity_t *entity = ref->entity;
1541         assert(is_declaration(entity));
1542
1543         switch((declaration_kind_t) entity->declaration.kind) {
1544         case DECLARATION_KIND_UNKNOWN:
1545                 break;
1546         case DECLARATION_KIND_PARAMETER:
1547         case DECLARATION_KIND_LOCAL_VARIABLE:
1548                 /* you can store to a local variable (so we don't panic but return NULL
1549                  * as an indicator for no real address) */
1550                 return NULL;
1551         case DECLARATION_KIND_GLOBAL_VARIABLE: {
1552                 ir_node *const addr = get_global_var_address(dbgi, entity);
1553                 return addr;
1554         }
1555         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY: {
1556                 ir_entity *irentity = entity->variable.v.entity;
1557                 ir_node   *frame    = get_local_frame(irentity);
1558                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1559
1560                 return sel;
1561         }
1562         case DECLARATION_KIND_PARAMETER_ENTITY: {
1563                 ir_entity *irentity = entity->parameter.v.entity;
1564                 ir_node   *frame    = get_local_frame(irentity);
1565                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1566
1567                 return sel;
1568         }
1569
1570         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
1571                 return entity->variable.v.vla_base;
1572
1573         case DECLARATION_KIND_FUNCTION: {
1574                 type_t  *const type = skip_typeref(entity->declaration.type);
1575                 ir_mode *const mode = get_ir_mode_storage(type);
1576                 return create_symconst(dbgi, mode, entity->function.entity);
1577         }
1578
1579         case DECLARATION_KIND_INNER_FUNCTION:
1580         case DECLARATION_KIND_COMPOUND_MEMBER:
1581                 panic("not implemented reference type");
1582         }
1583
1584         panic("reference to declaration with unknown type found");
1585 }
1586
1587 /**
1588  * Transform calls to builtin functions.
1589  */
1590 static ir_node *process_builtin_call(const call_expression_t *call)
1591 {
1592         dbg_info *dbgi = get_dbg_info(&call->base.source_position);
1593
1594         assert(call->function->kind == EXPR_BUILTIN_SYMBOL);
1595         builtin_symbol_expression_t *builtin = &call->function->builtin_symbol;
1596
1597         type_t *type = skip_typeref(builtin->base.type);
1598         assert(is_type_pointer(type));
1599
1600         type_t   *function_type = skip_typeref(type->pointer.points_to);
1601         symbol_t *symbol        = builtin->symbol;
1602
1603         switch(symbol->ID) {
1604         case T___builtin_alloca: {
1605                 if (call->arguments == NULL || call->arguments->next != NULL) {
1606                         panic("invalid number of parameters on __builtin_alloca");
1607                 }
1608                 expression_t *argument = call->arguments->expression;
1609                 ir_node      *size     = expression_to_firm(argument);
1610
1611                 ir_node *store  = get_store();
1612                 ir_node *alloca = new_d_Alloc(dbgi, store, size, firm_unknown_type,
1613                                               stack_alloc);
1614                 ir_node *proj_m = new_Proj(alloca, mode_M, pn_Alloc_M);
1615                 set_store(proj_m);
1616                 ir_node *res    = new_Proj(alloca, mode_P_data, pn_Alloc_res);
1617
1618                 return res;
1619         }
1620
1621         case T___builtin_huge_val:
1622         case T___builtin_inf:
1623         case T___builtin_inff:
1624         case T___builtin_infl: {
1625                 type_t  *type = function_type->function.return_type;
1626                 ir_mode *mode = get_ir_mode_arithmetic(type);
1627                 tarval  *tv   = get_mode_infinite(mode);
1628                 ir_node *res  = new_d_Const(dbgi, tv);
1629                 return   res;
1630         }
1631         case T___builtin_nan:
1632         case T___builtin_nanf:
1633         case T___builtin_nanl: {
1634                 /* Ignore string for now... */
1635                 assert(is_type_function(function_type));
1636                 type_t  *type = function_type->function.return_type;
1637                 ir_mode *mode = get_ir_mode_arithmetic(type);
1638                 tarval  *tv   = get_mode_NAN(mode);
1639                 ir_node *res  = new_d_Const(dbgi, tv);
1640                 return res;
1641         }
1642         case T___builtin_expect: {
1643                 expression_t *argument = call->arguments->expression;
1644                 return _expression_to_firm(argument);
1645         }
1646         case T___builtin_va_end:
1647                 /* evaluate the argument of va_end for its side effects */
1648                 _expression_to_firm(call->arguments->expression);
1649                 return NULL;
1650         case T___builtin_frame_address: {
1651                 expression_t *const expression = call->arguments->expression;
1652                 long val = fold_constant(expression);
1653                 if (val == 0) {
1654                         /* the nice case */
1655                         return get_irg_frame(current_ir_graph);
1656                 } else {
1657                         /* get the argument */
1658                         ir_node *in[2];
1659
1660                         in[0] = _expression_to_firm(expression);
1661                         in[1] = get_irg_frame(current_ir_graph);
1662                         ir_type *tp  = get_ir_type((type_t*) function_type);
1663                         ir_node *irn = new_d_Builtin(dbgi, get_irg_no_mem(current_ir_graph), ir_bk_frame_addess, 2, in, tp);
1664                         return new_Proj(irn, mode_P_data, pn_Builtin_1_result);
1665                 }
1666         }
1667         case T___builtin_return_address: {
1668                 expression_t *const expression = call->arguments->expression;
1669                 ir_node *in[2];
1670
1671                 in[0] = _expression_to_firm(expression);
1672                 in[1] = get_irg_frame(current_ir_graph);
1673                 ir_type *tp  = get_ir_type((type_t*) function_type);
1674                 ir_node *irn = new_d_Builtin(dbgi, get_irg_no_mem(current_ir_graph), ir_bk_return_address, 2, in, tp);
1675                 return new_Proj(irn, mode_P_data, pn_Builtin_1_result);
1676         }
1677
1678         default:
1679                 panic("unsupported builtin found");
1680         }
1681 }
1682
1683 /**
1684  * Transform a call expression.
1685  * Handles some special cases, like alloca() calls, which must be resolved
1686  * BEFORE the inlines runs. Inlining routines calling alloca() is dangerous,
1687  * 176.gcc for instance might allocate 2GB instead of 256 MB if alloca is not
1688  * handled right...
1689  */
1690 static ir_node *call_expression_to_firm(const call_expression_t *const call)
1691 {
1692         dbg_info *const dbgi = get_dbg_info(&call->base.source_position);
1693         assert(get_cur_block() != NULL);
1694
1695         expression_t *function = call->function;
1696         if (function->kind == EXPR_BUILTIN_SYMBOL) {
1697                 return process_builtin_call(call);
1698         }
1699         if (function->kind == EXPR_REFERENCE) {
1700                 const reference_expression_t *ref    = &function->reference;
1701                 entity_t                     *entity = ref->entity;
1702
1703                 if (entity->kind == ENTITY_FUNCTION
1704                                 && entity->function.entity == rts_entities[rts_alloca]) {
1705                         /* handle alloca() call */
1706                         expression_t *argument = call->arguments->expression;
1707                         ir_node      *size     = expression_to_firm(argument);
1708                         ir_mode      *mode     = get_ir_mode_arithmetic(type_size_t);
1709
1710                         size = create_conv(dbgi, size, mode);
1711
1712                         ir_node  *store  = get_store();
1713                         ir_node  *alloca = new_d_Alloc(dbgi, store, size, firm_unknown_type,
1714                                                        stack_alloc);
1715                         ir_node  *proj_m = new_Proj(alloca, mode_M, pn_Alloc_M);
1716                         set_store(proj_m);
1717                         ir_node  *res    = new_Proj(alloca, mode_P_data, pn_Alloc_res);
1718
1719                         return res;
1720                 }
1721         }
1722         ir_node *callee = expression_to_firm(function);
1723
1724         type_t *type = skip_typeref(function->base.type);
1725         assert(is_type_pointer(type));
1726         pointer_type_t *pointer_type = &type->pointer;
1727         type_t         *points_to    = skip_typeref(pointer_type->points_to);
1728         assert(is_type_function(points_to));
1729         function_type_t *function_type = &points_to->function;
1730
1731         int      n_parameters = 0;
1732         ir_type *ir_method_type  = get_ir_type((type_t*) function_type);
1733         ir_type *new_method_type = NULL;
1734         if (function_type->variadic || function_type->unspecified_parameters) {
1735                 const call_argument_t *argument = call->arguments;
1736                 for ( ; argument != NULL; argument = argument->next) {
1737                         ++n_parameters;
1738                 }
1739
1740                 /* we need to construct a new method type matching the call
1741                  * arguments... */
1742                 int n_res       = get_method_n_ress(ir_method_type);
1743                 new_method_type = new_d_type_method(id_unique("calltype.%u"),
1744                                                     n_parameters, n_res, dbgi);
1745                 set_method_calling_convention(new_method_type,
1746                                get_method_calling_convention(ir_method_type));
1747                 set_method_additional_properties(new_method_type,
1748                                get_method_additional_properties(ir_method_type));
1749                 set_method_variadicity(new_method_type,
1750                                        get_method_variadicity(ir_method_type));
1751
1752                 for (int i = 0; i < n_res; ++i) {
1753                         set_method_res_type(new_method_type, i,
1754                                             get_method_res_type(ir_method_type, i));
1755                 }
1756                 argument = call->arguments;
1757                 for (int i = 0; i < n_parameters; ++i, argument = argument->next) {
1758                         expression_t *expression = argument->expression;
1759                         ir_type      *irtype     = get_ir_type(expression->base.type);
1760                         set_method_param_type(new_method_type, i, irtype);
1761                 }
1762                 ir_method_type = new_method_type;
1763         } else {
1764                 n_parameters = get_method_n_params(ir_method_type);
1765         }
1766
1767         ir_node *in[n_parameters];
1768
1769         const call_argument_t *argument = call->arguments;
1770         for (int n = 0; n < n_parameters; ++n) {
1771                 expression_t *expression = argument->expression;
1772                 ir_node      *arg_node   = expression_to_firm(expression);
1773
1774                 type_t  *type = skip_typeref(expression->base.type);
1775                 if (!is_type_compound(type)) {
1776                         ir_mode *mode = get_ir_mode_storage(expression->base.type);
1777                         arg_node      = create_conv(dbgi, arg_node, mode);
1778                         arg_node      = do_strict_conv(dbgi, arg_node);
1779                 }
1780
1781                 in[n] = arg_node;
1782
1783                 argument = argument->next;
1784         }
1785
1786         ir_node  *store = get_store();
1787         ir_node  *node  = new_d_Call(dbgi, store, callee, n_parameters, in,
1788                                      ir_method_type);
1789         ir_node  *mem   = new_d_Proj(dbgi, node, mode_M, pn_Call_M_regular);
1790         set_store(mem);
1791
1792         type_t  *return_type = skip_typeref(function_type->return_type);
1793         ir_node *result      = NULL;
1794
1795         if (!is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
1796                 ir_node *resproj = new_d_Proj(dbgi, node, mode_T, pn_Call_T_result);
1797
1798                 if (is_type_scalar(return_type)) {
1799                         ir_mode *mode       = get_ir_mode_storage(return_type);
1800                         result              = new_d_Proj(dbgi, resproj, mode, 0);
1801                         ir_mode *mode_arith = get_ir_mode_arithmetic(return_type);
1802                         result              = create_conv(NULL, result, mode_arith);
1803                 } else {
1804                         ir_mode *mode = mode_P_data;
1805                         result        = new_d_Proj(dbgi, resproj, mode, 0);
1806                 }
1807         }
1808
1809         if (function->kind == EXPR_REFERENCE &&
1810             function->reference.entity->declaration.modifiers & DM_NORETURN) {
1811                 /* A dead end:  Keep the Call and the Block.  Also place all further
1812                  * nodes into a new and unreachable block. */
1813                 keep_alive(node);
1814                 keep_alive(get_cur_block());
1815                 new_Block(0, NULL);
1816         }
1817
1818         return result;
1819 }
1820
1821 static void statement_to_firm(statement_t *statement);
1822 static ir_node *compound_statement_to_firm(compound_statement_t *compound);
1823
1824 static ir_node *expression_to_addr(const expression_t *expression);
1825 static ir_node *create_condition_evaluation(const expression_t *expression,
1826                                             ir_node *true_block,
1827                                             ir_node *false_block);
1828
1829 static void assign_value(dbg_info *dbgi, ir_node *addr, type_t *type,
1830                          ir_node *value)
1831 {
1832         if (!is_type_compound(type)) {
1833                 ir_mode *mode = get_ir_mode_storage(type);
1834                 value         = create_conv(dbgi, value, mode);
1835                 value         = do_strict_conv(dbgi, value);
1836         }
1837
1838         ir_node *memory = get_store();
1839
1840         if (is_type_scalar(type)) {
1841                 ir_cons_flags flags = type->base.qualifiers & TYPE_QUALIFIER_VOLATILE
1842                                       ? cons_volatile : cons_none;
1843                 ir_node  *store     = new_d_Store(dbgi, memory, addr, value, flags);
1844                 ir_node  *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
1845                 set_store(store_mem);
1846         } else {
1847                 ir_type *irtype    = get_ir_type(type);
1848                 ir_node *copyb     = new_d_CopyB(dbgi, memory, addr, value, irtype);
1849                 ir_node *copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M_regular);
1850                 set_store(copyb_mem);
1851         }
1852 }
1853
1854 static tarval *create_bitfield_mask(ir_mode *mode, int offset, int size)
1855 {
1856         tarval *all_one   = get_mode_all_one(mode);
1857         int     mode_size = get_mode_size_bits(mode);
1858
1859         assert(offset >= 0);
1860         assert(size   >= 0);
1861         assert(offset + size <= mode_size);
1862         if (size == mode_size) {
1863                 return all_one;
1864         }
1865
1866         long    shiftr    = get_mode_size_bits(mode) - size;
1867         long    shiftl    = offset;
1868         tarval *tv_shiftr = new_tarval_from_long(shiftr, mode_uint);
1869         tarval *tv_shiftl = new_tarval_from_long(shiftl, mode_uint);
1870         tarval *mask0     = tarval_shr(all_one, tv_shiftr);
1871         tarval *mask1     = tarval_shl(mask0, tv_shiftl);
1872
1873         return mask1;
1874 }
1875
1876 static ir_node *bitfield_store_to_firm(dbg_info *dbgi,
1877                 ir_entity *entity, ir_node *addr, ir_node *value, bool set_volatile)
1878 {
1879         ir_type *entity_type = get_entity_type(entity);
1880         ir_type *base_type   = get_primitive_base_type(entity_type);
1881         assert(base_type != NULL);
1882         ir_mode *mode        = get_type_mode(base_type);
1883
1884         value = create_conv(dbgi, value, mode);
1885
1886         /* kill upper bits of value and shift to right position */
1887         int      bitoffset    = get_entity_offset_bits_remainder(entity);
1888         int      bitsize      = get_mode_size_bits(get_type_mode(entity_type));
1889
1890         tarval  *mask            = create_bitfield_mask(mode, 0, bitsize);
1891         ir_node *mask_node       = new_d_Const(dbgi, mask);
1892         ir_node *value_masked    = new_d_And(dbgi, value, mask_node, mode);
1893         tarval  *shiftl          = new_tarval_from_long(bitoffset, mode_uint);
1894         ir_node *shiftcount      = new_d_Const(dbgi, shiftl);
1895         ir_node *value_maskshift = new_d_Shl(dbgi, value_masked, shiftcount, mode);
1896
1897         /* load current value */
1898         ir_node  *mem             = get_store();
1899         ir_node  *load            = new_d_Load(dbgi, mem, addr, mode,
1900                                         set_volatile ? cons_volatile : cons_none);
1901         ir_node  *load_mem        = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1902         ir_node  *load_res        = new_d_Proj(dbgi, load, mode, pn_Load_res);
1903         tarval   *shift_mask      = create_bitfield_mask(mode, bitoffset, bitsize);
1904         tarval   *inv_mask        = tarval_not(shift_mask);
1905         ir_node  *inv_mask_node   = new_d_Const(dbgi, inv_mask);
1906         ir_node  *load_res_masked = new_d_And(dbgi, load_res, inv_mask_node, mode);
1907
1908         /* construct new value and store */
1909         ir_node *new_val   = new_d_Or(dbgi, load_res_masked, value_maskshift, mode);
1910         ir_node *store     = new_d_Store(dbgi, load_mem, addr, new_val,
1911                                          set_volatile ? cons_volatile : cons_none);
1912         ir_node *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
1913         set_store(store_mem);
1914
1915         return value_masked;
1916 }
1917
1918 static ir_node *bitfield_extract_to_firm(const select_expression_t *expression,
1919                 ir_node *addr)
1920 {
1921         dbg_info *dbgi     = get_dbg_info(&expression->base.source_position);
1922         type_t   *type     = expression->base.type;
1923         ir_mode  *mode     = get_ir_mode_storage(type);
1924         ir_node  *mem      = get_store();
1925         ir_node  *load     = new_d_Load(dbgi, mem, addr, mode, cons_none);
1926         ir_node  *load_mem = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1927         ir_node  *load_res = new_d_Proj(dbgi, load, mode, pn_Load_res);
1928
1929         load_res           = create_conv(dbgi, load_res, mode_int);
1930
1931         set_store(load_mem);
1932
1933         /* kill upper bits */
1934         assert(expression->compound_entry->kind == ENTITY_COMPOUND_MEMBER);
1935         ir_entity *entity       = expression->compound_entry->compound_member.entity;
1936         int        bitoffset    = get_entity_offset_bits_remainder(entity);
1937         ir_type   *entity_type  = get_entity_type(entity);
1938         int        bitsize      = get_mode_size_bits(get_type_mode(entity_type));
1939         long       shift_bitsl  = machine_size - bitoffset - bitsize;
1940         assert(shift_bitsl >= 0);
1941         tarval    *tvl          = new_tarval_from_long(shift_bitsl, mode_uint);
1942         ir_node   *countl       = new_d_Const(dbgi, tvl);
1943         ir_node   *shiftl       = new_d_Shl(dbgi, load_res, countl, mode_int);
1944
1945         long       shift_bitsr  = bitoffset + shift_bitsl;
1946         assert(shift_bitsr <= (long) machine_size);
1947         tarval    *tvr          = new_tarval_from_long(shift_bitsr, mode_uint);
1948         ir_node   *countr       = new_d_Const(dbgi, tvr);
1949         ir_node   *shiftr;
1950         if (mode_is_signed(mode)) {
1951                 shiftr = new_d_Shrs(dbgi, shiftl, countr, mode_int);
1952         } else {
1953                 shiftr = new_d_Shr(dbgi, shiftl, countr, mode_int);
1954         }
1955
1956         return create_conv(dbgi, shiftr, mode);
1957 }
1958
1959 /* make sure the selected compound type is constructed */
1960 static void construct_select_compound(const select_expression_t *expression)
1961 {
1962         type_t *type = skip_typeref(expression->compound->base.type);
1963         if (is_type_pointer(type)) {
1964                 type = type->pointer.points_to;
1965         }
1966         (void) get_ir_type(type);
1967 }
1968
1969 static ir_node *set_value_for_expression_addr(const expression_t *expression,
1970                                               ir_node *value, ir_node *addr)
1971 {
1972         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
1973         type_t   *type = skip_typeref(expression->base.type);
1974
1975         if (!is_type_compound(type)) {
1976                 ir_mode  *mode = get_ir_mode_storage(type);
1977                 value          = create_conv(dbgi, value, mode);
1978                 value          = do_strict_conv(dbgi, value);
1979         }
1980
1981         if (expression->kind == EXPR_REFERENCE) {
1982                 const reference_expression_t *ref = &expression->reference;
1983
1984                 entity_t *entity = ref->entity;
1985                 assert(is_declaration(entity));
1986                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
1987                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE) {
1988                         set_value(entity->variable.v.value_number, value);
1989                         return value;
1990                 } else if (entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
1991                         set_value(entity->parameter.v.value_number, value);
1992                         return value;
1993                 }
1994         }
1995
1996         if (addr == NULL)
1997                 addr = expression_to_addr(expression);
1998         assert(addr != NULL);
1999
2000         if (expression->kind == EXPR_SELECT) {
2001                 const select_expression_t *select = &expression->select;
2002
2003                 construct_select_compound(select);
2004
2005                 entity_t *entity = select->compound_entry;
2006                 assert(entity->kind == ENTITY_COMPOUND_MEMBER);
2007                 if (entity->declaration.type->kind == TYPE_BITFIELD) {
2008                         ir_entity *irentity = entity->compound_member.entity;
2009                         bool       set_volatile
2010                                 = select->base.type->base.qualifiers & TYPE_QUALIFIER_VOLATILE;
2011                         value = bitfield_store_to_firm(dbgi, irentity, addr, value,
2012                                                        set_volatile);
2013                         return value;
2014                 }
2015         }
2016
2017         assign_value(dbgi, addr, type, value);
2018         return value;
2019 }
2020
2021 static void set_value_for_expression(const expression_t *expression,
2022                                      ir_node *value)
2023 {
2024         set_value_for_expression_addr(expression, value, NULL);
2025 }
2026
2027 static ir_node *get_value_from_lvalue(const expression_t *expression,
2028                                       ir_node *addr)
2029 {
2030         if (expression->kind == EXPR_REFERENCE) {
2031                 const reference_expression_t *ref = &expression->reference;
2032
2033                 entity_t *entity = ref->entity;
2034                 assert(entity->kind == ENTITY_VARIABLE
2035                                 || entity->kind == ENTITY_PARAMETER);
2036                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2037                 int value_number;
2038                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE) {
2039                         value_number = entity->variable.v.value_number;
2040                         assert(addr == NULL);
2041                         type_t  *type = skip_typeref(expression->base.type);
2042                         ir_mode *mode = get_ir_mode_storage(type);
2043                         ir_node *res  = get_value(value_number, mode);
2044                         return create_conv(NULL, res, get_ir_mode_arithmetic(type));
2045                 } else if (entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
2046                         value_number = entity->parameter.v.value_number;
2047                         assert(addr == NULL);
2048                         type_t  *type = skip_typeref(expression->base.type);
2049                         ir_mode *mode = get_ir_mode_storage(type);
2050                         ir_node *res  = get_value(value_number, mode);
2051                         return create_conv(NULL, res, get_ir_mode_arithmetic(type));
2052                 }
2053         }
2054
2055         assert(addr != NULL);
2056         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2057
2058         ir_node *value;
2059         if (expression->kind == EXPR_SELECT &&
2060             expression->select.compound_entry->declaration.type->kind == TYPE_BITFIELD){
2061             construct_select_compound(&expression->select);
2062                 value = bitfield_extract_to_firm(&expression->select, addr);
2063         } else {
2064                 value = deref_address(dbgi, expression->base.type, addr);
2065         }
2066
2067         return value;
2068 }
2069
2070
2071 static ir_node *create_incdec(const unary_expression_t *expression)
2072 {
2073         dbg_info *const     dbgi = get_dbg_info(&expression->base.source_position);
2074         const expression_t *value_expr = expression->value;
2075         ir_node            *addr       = expression_to_addr(value_expr);
2076         ir_node            *value      = get_value_from_lvalue(value_expr, addr);
2077
2078         type_t  *type = skip_typeref(expression->base.type);
2079         ir_mode *mode = get_ir_mode_arithmetic(expression->base.type);
2080
2081         ir_node *offset;
2082         if (is_type_pointer(type)) {
2083                 pointer_type_t *pointer_type = &type->pointer;
2084                 offset                       = get_type_size(pointer_type->points_to);
2085         } else {
2086                 assert(is_type_arithmetic(type));
2087                 offset = new_Const(get_mode_one(mode));
2088         }
2089
2090         ir_node *result;
2091         ir_node *store_value;
2092         switch(expression->base.kind) {
2093         case EXPR_UNARY_POSTFIX_INCREMENT:
2094                 result      = value;
2095                 store_value = new_d_Add(dbgi, value, offset, mode);
2096                 break;
2097         case EXPR_UNARY_POSTFIX_DECREMENT:
2098                 result      = value;
2099                 store_value = new_d_Sub(dbgi, value, offset, mode);
2100                 break;
2101         case EXPR_UNARY_PREFIX_INCREMENT:
2102                 result      = new_d_Add(dbgi, value, offset, mode);
2103                 store_value = result;
2104                 break;
2105         case EXPR_UNARY_PREFIX_DECREMENT:
2106                 result      = new_d_Sub(dbgi, value, offset, mode);
2107                 store_value = result;
2108                 break;
2109         default:
2110                 panic("no incdec expr in create_incdec");
2111         }
2112
2113         set_value_for_expression_addr(value_expr, store_value, addr);
2114
2115         return result;
2116 }
2117
2118 static bool is_local_variable(expression_t *expression)
2119 {
2120         if (expression->kind != EXPR_REFERENCE)
2121                 return false;
2122         reference_expression_t *ref_expr = &expression->reference;
2123         entity_t               *entity   = ref_expr->entity;
2124         if (entity->kind != ENTITY_VARIABLE)
2125                 return false;
2126         assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2127         return entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE;
2128 }
2129
2130 static pn_Cmp get_pnc(const expression_kind_t kind, type_t *const type)
2131 {
2132         switch(kind) {
2133         case EXPR_BINARY_EQUAL:         return pn_Cmp_Eq;
2134         case EXPR_BINARY_ISLESSGREATER: return pn_Cmp_Lg;
2135         case EXPR_BINARY_NOTEQUAL:
2136                 return is_type_float(skip_typeref(type)) ? pn_Cmp_Ne : pn_Cmp_Lg;
2137         case EXPR_BINARY_ISLESS:
2138         case EXPR_BINARY_LESS:          return pn_Cmp_Lt;
2139         case EXPR_BINARY_ISLESSEQUAL:
2140         case EXPR_BINARY_LESSEQUAL:     return pn_Cmp_Le;
2141         case EXPR_BINARY_ISGREATER:
2142         case EXPR_BINARY_GREATER:       return pn_Cmp_Gt;
2143         case EXPR_BINARY_ISGREATEREQUAL:
2144         case EXPR_BINARY_GREATEREQUAL:  return pn_Cmp_Ge;
2145         case EXPR_BINARY_ISUNORDERED:   return pn_Cmp_Uo;
2146
2147         default:
2148                 break;
2149         }
2150         panic("trying to get pn_Cmp from non-comparison binexpr type");
2151 }
2152
2153 /**
2154  * Handle the assume optimizer hint: check if a Confirm
2155  * node can be created.
2156  *
2157  * @param dbi    debug info
2158  * @param expr   the IL assume expression
2159  *
2160  * we support here only some simple cases:
2161  *  - var rel const
2162  *  - const rel val
2163  *  - var rel var
2164  */
2165 static ir_node *handle_assume_compare(dbg_info *dbi,
2166                                       const binary_expression_t *expression)
2167 {
2168         expression_t *op1 = expression->left;
2169         expression_t *op2 = expression->right;
2170         entity_t     *var2, *var = NULL;
2171         ir_node      *res = NULL;
2172         pn_Cmp        cmp_val;
2173
2174         cmp_val = get_pnc(expression->base.kind, op1->base.type);
2175
2176         if (is_local_variable(op1) && is_local_variable(op2)) {
2177         var  = op1->reference.entity;
2178             var2 = op2->reference.entity;
2179
2180                 type_t  *const type = skip_typeref(var->declaration.type);
2181                 ir_mode *const mode = get_ir_mode_storage(type);
2182
2183                 ir_node *const irn1 = get_value(var->variable.v.value_number, mode);
2184                 ir_node *const irn2 = get_value(var2->variable.v.value_number, mode);
2185
2186                 res = new_d_Confirm(dbi, irn2, irn1, get_inversed_pnc(cmp_val));
2187                 set_value(var2->variable.v.value_number, res);
2188
2189                 res = new_d_Confirm(dbi, irn1, irn2, cmp_val);
2190                 set_value(var->variable.v.value_number, res);
2191
2192                 return res;
2193         }
2194
2195         expression_t *con;
2196         if (is_local_variable(op1) && is_constant_expression(op2)) {
2197                 var = op1->reference.entity;
2198                 con = op2;
2199         } else if (is_constant_expression(op1) && is_local_variable(op2)) {
2200                 cmp_val = get_inversed_pnc(cmp_val);
2201                 var = op2->reference.entity;
2202                 con = op1;
2203         }
2204
2205         if (var != NULL) {
2206                 type_t  *const type = skip_typeref(var->declaration.type);
2207                 ir_mode *const mode = get_ir_mode_storage(type);
2208
2209                 res = get_value(var->variable.v.value_number, mode);
2210                 res = new_d_Confirm(dbi, res, expression_to_firm(con), cmp_val);
2211                 set_value(var->variable.v.value_number, res);
2212         }
2213         return res;
2214 }
2215
2216 /**
2217  * Handle the assume optimizer hint.
2218  *
2219  * @param dbi    debug info
2220  * @param expr   the IL assume expression
2221  */
2222 static ir_node *handle_assume(dbg_info *dbi, const expression_t *expression)
2223 {
2224         switch(expression->kind) {
2225         case EXPR_BINARY_EQUAL:
2226         case EXPR_BINARY_NOTEQUAL:
2227         case EXPR_BINARY_LESS:
2228         case EXPR_BINARY_LESSEQUAL:
2229         case EXPR_BINARY_GREATER:
2230         case EXPR_BINARY_GREATEREQUAL:
2231                 return handle_assume_compare(dbi, &expression->binary);
2232         default:
2233                 return NULL;
2234         }
2235 }
2236
2237 static ir_node *unary_expression_to_firm(const unary_expression_t *expression)
2238 {
2239         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2240         type_t   *type = skip_typeref(expression->base.type);
2241
2242         if (expression->base.kind == EXPR_UNARY_TAKE_ADDRESS)
2243                 return expression_to_addr(expression->value);
2244
2245         const expression_t *value = expression->value;
2246
2247         switch(expression->base.kind) {
2248         case EXPR_UNARY_NEGATE: {
2249                 ir_node *value_node = expression_to_firm(value);
2250                 ir_mode *mode       = get_ir_mode_arithmetic(type);
2251                 return new_d_Minus(dbgi, value_node, mode);
2252         }
2253         case EXPR_UNARY_PLUS:
2254                 return expression_to_firm(value);
2255         case EXPR_UNARY_BITWISE_NEGATE: {
2256                 ir_node *value_node = expression_to_firm(value);
2257                 ir_mode *mode       = get_ir_mode_arithmetic(type);
2258                 return new_d_Not(dbgi, value_node, mode);
2259         }
2260         case EXPR_UNARY_NOT: {
2261                 ir_node *value_node = _expression_to_firm(value);
2262                 value_node          = create_conv(dbgi, value_node, mode_b);
2263                 ir_node *res        = new_d_Not(dbgi, value_node, mode_b);
2264                 return res;
2265         }
2266         case EXPR_UNARY_DEREFERENCE: {
2267                 ir_node *value_node = expression_to_firm(value);
2268                 type_t  *value_type = skip_typeref(value->base.type);
2269                 assert(is_type_pointer(value_type));
2270                 type_t  *points_to  = value_type->pointer.points_to;
2271                 return deref_address(dbgi, points_to, value_node);
2272         }
2273         case EXPR_UNARY_POSTFIX_INCREMENT:
2274         case EXPR_UNARY_POSTFIX_DECREMENT:
2275         case EXPR_UNARY_PREFIX_INCREMENT:
2276         case EXPR_UNARY_PREFIX_DECREMENT:
2277                 return create_incdec(expression);
2278         case EXPR_UNARY_CAST: {
2279                 ir_node *value_node = expression_to_firm(value);
2280                 if (is_type_scalar(type)) {
2281                         ir_mode *mode       = get_ir_mode_storage(type);
2282                         ir_node *node       = create_conv(dbgi, value_node, mode);
2283                         node                = do_strict_conv(dbgi, node);
2284                         ir_mode *mode_arith = get_ir_mode_arithmetic(type);
2285                         node                = create_conv(dbgi, node, mode_arith);
2286                         return node;
2287                 } else {
2288                         /* make sure firm type is constructed */
2289                         (void) get_ir_type(type);
2290                         return value_node;
2291                 }
2292         }
2293         case EXPR_UNARY_CAST_IMPLICIT: {
2294                 ir_node *value_node = expression_to_firm(value);
2295                 if (is_type_scalar(type)) {
2296                         ir_mode *mode       = get_ir_mode_storage(type);
2297                         ir_node *res        = create_conv(dbgi, value_node, mode);
2298                         ir_mode *mode_arith = get_ir_mode_arithmetic(type);
2299                         res                 = create_conv(dbgi, res, mode_arith);
2300                         return res;
2301                 } else {
2302                         return value_node;
2303                 }
2304         }
2305         case EXPR_UNARY_ASSUME:
2306                 if (firm_opt.confirm)
2307                         return handle_assume(dbgi, value);
2308                 else
2309                         return NULL;
2310
2311         default:
2312                 break;
2313         }
2314         panic("invalid UNEXPR type found");
2315 }
2316
2317 /**
2318  * produces a 0/1 depending of the value of a mode_b node
2319  */
2320 static ir_node *produce_condition_result(const expression_t *expression,
2321                                          ir_mode *mode, dbg_info *dbgi)
2322 {
2323         ir_node *cur_block = get_cur_block();
2324
2325         ir_node *one_block = new_immBlock();
2326         set_cur_block(one_block);
2327         ir_node *one       = new_Const(get_mode_one(mode));
2328         ir_node *jmp_one   = new_d_Jmp(dbgi);
2329
2330         ir_node *zero_block = new_immBlock();
2331         set_cur_block(zero_block);
2332         ir_node *zero       = new_Const(get_mode_null(mode));
2333         ir_node *jmp_zero   = new_d_Jmp(dbgi);
2334
2335         set_cur_block(cur_block);
2336         create_condition_evaluation(expression, one_block, zero_block);
2337         mature_immBlock(one_block);
2338         mature_immBlock(zero_block);
2339
2340         ir_node *in_cf[2] = { jmp_one, jmp_zero };
2341         new_Block(2, in_cf);
2342
2343         ir_node *in[2] = { one, zero };
2344         ir_node *val   = new_d_Phi(dbgi, 2, in, mode);
2345
2346         return val;
2347 }
2348
2349 static ir_node *adjust_for_pointer_arithmetic(dbg_info *dbgi,
2350                 ir_node *value, type_t *type)
2351 {
2352         ir_mode        *const mode         = get_ir_mode_arithmetic(type_ptrdiff_t);
2353         assert(is_type_pointer(type));
2354         pointer_type_t *const pointer_type = &type->pointer;
2355         type_t         *const points_to    = skip_typeref(pointer_type->points_to);
2356         unsigned              elem_size    = get_type_size_const(points_to);
2357
2358         value = create_conv(dbgi, value, mode);
2359
2360         /* gcc extension: allow arithmetic with void * and function * */
2361         if ((elem_size == 0 && is_type_atomic(points_to, ATOMIC_TYPE_VOID)) ||
2362             is_type_function(points_to))  {
2363                 elem_size = 1;
2364         }
2365
2366         assert(elem_size >= 1);
2367         if (elem_size == 1)
2368                 return value;
2369
2370         ir_node *const cnst = new_Const_long(mode, (long)elem_size);
2371         ir_node *const mul  = new_d_Mul(dbgi, value, cnst, mode);
2372         return mul;
2373 }
2374
2375 static ir_node *create_op(dbg_info *dbgi, const binary_expression_t *expression,
2376                           ir_node *left, ir_node *right)
2377 {
2378         ir_mode  *mode;
2379         type_t   *type_left  = skip_typeref(expression->left->base.type);
2380         type_t   *type_right = skip_typeref(expression->right->base.type);
2381
2382         expression_kind_t kind = expression->base.kind;
2383
2384         switch (kind) {
2385         case EXPR_BINARY_SHIFTLEFT:
2386         case EXPR_BINARY_SHIFTRIGHT:
2387         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2388         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2389                 mode  = get_irn_mode(left);
2390                 right = create_conv(dbgi, right, mode_uint);
2391                 break;
2392
2393         case EXPR_BINARY_SUB:
2394                 if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
2395                         const pointer_type_t *const ptr_type = &type_left->pointer;
2396
2397                         mode = get_ir_mode_arithmetic(expression->base.type);
2398                         ir_node *const elem_size = get_type_size(ptr_type->points_to);
2399                         ir_node *const conv_size = new_d_Conv(dbgi, elem_size, mode);
2400                         ir_node *const sub       = new_d_Sub(dbgi, left, right, mode);
2401                         ir_node *const no_mem    = new_NoMem();
2402                         ir_node *const div       = new_d_DivRL(dbgi, no_mem, sub, conv_size,
2403                                                                                                    mode, op_pin_state_floats);
2404                         return new_d_Proj(dbgi, div, mode, pn_Div_res);
2405                 }
2406                 /* fallthrough */
2407         case EXPR_BINARY_SUB_ASSIGN:
2408                 if (is_type_pointer(type_left)) {
2409                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2410                         mode  = get_ir_mode_arithmetic(type_left);
2411                         break;
2412                 }
2413                 goto normal_node;
2414
2415         case EXPR_BINARY_ADD:
2416         case EXPR_BINARY_ADD_ASSIGN:
2417                 if (is_type_pointer(type_left)) {
2418                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2419                         mode  = get_ir_mode_arithmetic(type_left);
2420                         break;
2421                 } else if (is_type_pointer(type_right)) {
2422                         left  = adjust_for_pointer_arithmetic(dbgi, left, type_right);
2423                         mode  = get_ir_mode_arithmetic(type_right);
2424                         break;
2425                 }
2426                 goto normal_node;
2427
2428         default:
2429 normal_node:
2430                 mode = get_ir_mode_arithmetic(type_right);
2431                 left = create_conv(dbgi, left, mode);
2432                 break;
2433         }
2434
2435         switch (kind) {
2436         case EXPR_BINARY_ADD_ASSIGN:
2437         case EXPR_BINARY_ADD:
2438                 return new_d_Add(dbgi, left, right, mode);
2439         case EXPR_BINARY_SUB_ASSIGN:
2440         case EXPR_BINARY_SUB:
2441                 return new_d_Sub(dbgi, left, right, mode);
2442         case EXPR_BINARY_MUL_ASSIGN:
2443         case EXPR_BINARY_MUL:
2444                 return new_d_Mul(dbgi, left, right, mode);
2445         case EXPR_BINARY_BITWISE_AND:
2446         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2447                 return new_d_And(dbgi, left, right, mode);
2448         case EXPR_BINARY_BITWISE_OR:
2449         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2450                 return new_d_Or(dbgi, left, right, mode);
2451         case EXPR_BINARY_BITWISE_XOR:
2452         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2453                 return new_d_Eor(dbgi, left, right, mode);
2454         case EXPR_BINARY_SHIFTLEFT:
2455         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2456                 return new_d_Shl(dbgi, left, right, mode);
2457         case EXPR_BINARY_SHIFTRIGHT:
2458         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2459                 if (mode_is_signed(mode)) {
2460                         return new_d_Shrs(dbgi, left, right, mode);
2461                 } else {
2462                         return new_d_Shr(dbgi, left, right, mode);
2463                 }
2464         case EXPR_BINARY_DIV:
2465         case EXPR_BINARY_DIV_ASSIGN: {
2466                 ir_node *pin = new_Pin(new_NoMem());
2467                 ir_node *op;
2468                 ir_node *res;
2469                 if (mode_is_float(mode)) {
2470                         op  = new_d_Quot(dbgi, pin, left, right, mode, op_pin_state_floats);
2471                         res = new_d_Proj(dbgi, op, mode, pn_Quot_res);
2472                 } else {
2473                         op  = new_d_Div(dbgi, pin, left, right, mode, op_pin_state_floats);
2474                         res = new_d_Proj(dbgi, op, mode, pn_Div_res);
2475                 }
2476                 return res;
2477         }
2478         case EXPR_BINARY_MOD:
2479         case EXPR_BINARY_MOD_ASSIGN: {
2480                 ir_node *pin = new_Pin(new_NoMem());
2481                 assert(!mode_is_float(mode));
2482                 ir_node *op  = new_d_Mod(dbgi, pin, left, right, mode,
2483                                          op_pin_state_floats);
2484                 ir_node *res = new_d_Proj(dbgi, op, mode, pn_Mod_res);
2485                 return res;
2486         }
2487         default:
2488                 panic("unexpected expression kind");
2489         }
2490 }
2491
2492 static ir_node *create_lazy_op(const binary_expression_t *expression)
2493 {
2494         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2495         type_t   *type = skip_typeref(expression->base.type);
2496         ir_mode  *mode = get_ir_mode_arithmetic(type);
2497
2498         if (is_constant_expression(expression->left)) {
2499                 long val = fold_constant(expression->left);
2500                 expression_kind_t ekind = expression->base.kind;
2501                 assert(ekind == EXPR_BINARY_LOGICAL_AND || ekind == EXPR_BINARY_LOGICAL_OR);
2502                 if (ekind == EXPR_BINARY_LOGICAL_AND) {
2503                         if (val == 0) {
2504                                 return new_Const(get_mode_null(mode));
2505                         }
2506                 } else {
2507                         if (val != 0) {
2508                                 return new_Const(get_mode_one(mode));
2509                         }
2510                 }
2511
2512                 if (is_constant_expression(expression->right)) {
2513                         long const valr = fold_constant(expression->right);
2514                         return valr != 0 ?
2515                                 new_Const(get_mode_one(mode)) :
2516                                 new_Const(get_mode_null(mode));
2517                 }
2518
2519                 return produce_condition_result(expression->right, mode, dbgi);
2520         }
2521
2522         return produce_condition_result((const expression_t*) expression, mode,
2523                                         dbgi);
2524 }
2525
2526 typedef ir_node * (*create_arithmetic_func)(dbg_info *dbgi, ir_node *left,
2527                                             ir_node *right, ir_mode *mode);
2528
2529 static ir_node *create_assign_binop(const binary_expression_t *expression)
2530 {
2531         dbg_info *const     dbgi = get_dbg_info(&expression->base.source_position);
2532         const expression_t *left_expr = expression->left;
2533         type_t             *type      = skip_typeref(left_expr->base.type);
2534         ir_mode            *left_mode = get_ir_mode_storage(type);
2535         ir_node            *right     = expression_to_firm(expression->right);
2536         ir_node            *left_addr = expression_to_addr(left_expr);
2537         ir_node            *left      = get_value_from_lvalue(left_expr, left_addr);
2538         ir_node            *result    = create_op(dbgi, expression, left, right);
2539
2540         result = create_conv(dbgi, result, left_mode);
2541         result = do_strict_conv(dbgi, result);
2542
2543         result = set_value_for_expression_addr(left_expr, result, left_addr);
2544
2545         if (!is_type_compound(type)) {
2546                 ir_mode *mode_arithmetic = get_ir_mode_arithmetic(type);
2547                 result = create_conv(dbgi, result, mode_arithmetic);
2548         }
2549         return result;
2550 }
2551
2552 static ir_node *binary_expression_to_firm(const binary_expression_t *expression)
2553 {
2554         expression_kind_t kind = expression->base.kind;
2555
2556         switch(kind) {
2557         case EXPR_BINARY_EQUAL:
2558         case EXPR_BINARY_NOTEQUAL:
2559         case EXPR_BINARY_LESS:
2560         case EXPR_BINARY_LESSEQUAL:
2561         case EXPR_BINARY_GREATER:
2562         case EXPR_BINARY_GREATEREQUAL:
2563         case EXPR_BINARY_ISGREATER:
2564         case EXPR_BINARY_ISGREATEREQUAL:
2565         case EXPR_BINARY_ISLESS:
2566         case EXPR_BINARY_ISLESSEQUAL:
2567         case EXPR_BINARY_ISLESSGREATER:
2568         case EXPR_BINARY_ISUNORDERED: {
2569                 dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2570                 ir_node *left  = expression_to_firm(expression->left);
2571                 ir_node *right = expression_to_firm(expression->right);
2572                 ir_node *cmp   = new_d_Cmp(dbgi, left, right);
2573                 long     pnc   = get_pnc(kind, expression->left->base.type);
2574                 ir_node *proj  = new_d_Proj(dbgi, cmp, mode_b, pnc);
2575                 return proj;
2576         }
2577         case EXPR_BINARY_ASSIGN: {
2578                 ir_node *addr  = expression_to_addr(expression->left);
2579                 ir_node *right = expression_to_firm(expression->right);
2580                 ir_node *res
2581                         = set_value_for_expression_addr(expression->left, right, addr);
2582
2583                 type_t  *type            = skip_typeref(expression->base.type);
2584                 if (!is_type_compound(type)) {
2585                         ir_mode *mode_arithmetic = get_ir_mode_arithmetic(type);
2586                         res                      = create_conv(NULL, res, mode_arithmetic);
2587                 }
2588                 return res;
2589         }
2590         case EXPR_BINARY_ADD:
2591         case EXPR_BINARY_SUB:
2592         case EXPR_BINARY_MUL:
2593         case EXPR_BINARY_DIV:
2594         case EXPR_BINARY_MOD:
2595         case EXPR_BINARY_BITWISE_AND:
2596         case EXPR_BINARY_BITWISE_OR:
2597         case EXPR_BINARY_BITWISE_XOR:
2598         case EXPR_BINARY_SHIFTLEFT:
2599         case EXPR_BINARY_SHIFTRIGHT:
2600         {
2601                 dbg_info *dbgi  = get_dbg_info(&expression->base.source_position);
2602                 ir_node  *left  = expression_to_firm(expression->left);
2603                 ir_node  *right = expression_to_firm(expression->right);
2604                 return create_op(dbgi, expression, left, right);
2605         }
2606         case EXPR_BINARY_LOGICAL_AND:
2607         case EXPR_BINARY_LOGICAL_OR:
2608                 return create_lazy_op(expression);
2609         case EXPR_BINARY_COMMA:
2610                 /* create side effects of left side */
2611                 (void) expression_to_firm(expression->left);
2612                 return _expression_to_firm(expression->right);
2613
2614         case EXPR_BINARY_ADD_ASSIGN:
2615         case EXPR_BINARY_SUB_ASSIGN:
2616         case EXPR_BINARY_MUL_ASSIGN:
2617         case EXPR_BINARY_MOD_ASSIGN:
2618         case EXPR_BINARY_DIV_ASSIGN:
2619         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2620         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2621         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2622         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2623         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2624                 return create_assign_binop(expression);
2625         default:
2626                 panic("TODO binexpr type");
2627         }
2628 }
2629
2630 static ir_node *array_access_addr(const array_access_expression_t *expression)
2631 {
2632         dbg_info *dbgi        = get_dbg_info(&expression->base.source_position);
2633         ir_node  *base_addr   = expression_to_firm(expression->array_ref);
2634         ir_node  *offset      = expression_to_firm(expression->index);
2635         type_t   *ref_type    = skip_typeref(expression->array_ref->base.type);
2636         ir_node  *real_offset = adjust_for_pointer_arithmetic(dbgi, offset, ref_type);
2637         ir_node  *result      = new_d_Add(dbgi, base_addr, real_offset, mode_P_data);
2638
2639         return result;
2640 }
2641
2642 static ir_node *array_access_to_firm(
2643                 const array_access_expression_t *expression)
2644 {
2645         dbg_info *dbgi   = get_dbg_info(&expression->base.source_position);
2646         ir_node  *addr   = array_access_addr(expression);
2647         type_t   *type   = revert_automatic_type_conversion(
2648                         (const expression_t*) expression);
2649         type             = skip_typeref(type);
2650
2651         return deref_address(dbgi, type, addr);
2652 }
2653
2654 static long get_offsetof_offset(const offsetof_expression_t *expression)
2655 {
2656         type_t *orig_type = expression->type;
2657         long    offset    = 0;
2658
2659         designator_t *designator = expression->designator;
2660         for ( ; designator != NULL; designator = designator->next) {
2661                 type_t *type = skip_typeref(orig_type);
2662                 /* be sure the type is constructed */
2663                 (void) get_ir_type(type);
2664
2665                 if (designator->symbol != NULL) {
2666                         assert(is_type_compound(type));
2667                         symbol_t *symbol = designator->symbol;
2668
2669                         compound_t *compound = type->compound.compound;
2670                         entity_t   *iter     = compound->members.entities;
2671                         for ( ; iter != NULL; iter = iter->base.next) {
2672                                 if (iter->base.symbol == symbol) {
2673                                         break;
2674                                 }
2675                         }
2676                         assert(iter != NULL);
2677
2678                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
2679                         assert(iter->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
2680                         offset += get_entity_offset(iter->compound_member.entity);
2681
2682                         orig_type = iter->declaration.type;
2683                 } else {
2684                         expression_t *array_index = designator->array_index;
2685                         assert(designator->array_index != NULL);
2686                         assert(is_type_array(type));
2687
2688                         long index         = fold_constant(array_index);
2689                         ir_type *arr_type  = get_ir_type(type);
2690                         ir_type *elem_type = get_array_element_type(arr_type);
2691                         long     elem_size = get_type_size_bytes(elem_type);
2692
2693                         offset += index * elem_size;
2694
2695                         orig_type = type->array.element_type;
2696                 }
2697         }
2698
2699         return offset;
2700 }
2701
2702 static ir_node *offsetof_to_firm(const offsetof_expression_t *expression)
2703 {
2704         ir_mode  *mode   = get_ir_mode_arithmetic(expression->base.type);
2705         long      offset = get_offsetof_offset(expression);
2706         tarval   *tv     = new_tarval_from_long(offset, mode);
2707         dbg_info *dbgi   = get_dbg_info(&expression->base.source_position);
2708
2709         return new_d_Const(dbgi, tv);
2710 }
2711
2712 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
2713                                      ir_entity *entity, type_t *type);
2714
2715 static ir_node *compound_literal_to_firm(
2716                 const compound_literal_expression_t *expression)
2717 {
2718         type_t *type = expression->type;
2719
2720         /* create an entity on the stack */
2721         ir_type *frame_type = get_irg_frame_type(current_ir_graph);
2722
2723         ident     *const id     = id_unique("CompLit.%u");
2724         ir_type   *const irtype = get_ir_type(type);
2725         dbg_info  *const dbgi   = get_dbg_info(&expression->base.source_position);
2726         ir_entity *const entity = new_d_entity(frame_type, id, irtype, dbgi);
2727         set_entity_ld_ident(entity, id);
2728
2729         set_entity_variability(entity, variability_uninitialized);
2730
2731         /* create initialisation code */
2732         initializer_t *initializer = expression->initializer;
2733         create_local_initializer(initializer, dbgi, entity, type);
2734
2735         /* create a sel for the compound literal address */
2736         ir_node *frame = get_local_frame(entity);
2737         ir_node *sel   = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
2738         return sel;
2739 }
2740
2741 /**
2742  * Transform a sizeof expression into Firm code.
2743  */
2744 static ir_node *sizeof_to_firm(const typeprop_expression_t *expression)
2745 {
2746         type_t *type = expression->type;
2747         if (type == NULL) {
2748                 type = expression->tp_expression->base.type;
2749                 assert(type != NULL);
2750         }
2751
2752         type = skip_typeref(type);
2753         /* § 6.5.3.4 (2) if the type is a VLA, evaluate the expression. */
2754         if (is_type_array(type) && type->array.is_vla
2755                         && expression->tp_expression != NULL) {
2756                 expression_to_firm(expression->tp_expression);
2757         }
2758
2759         return get_type_size(type);
2760 }
2761
2762 static entity_t *get_expression_entity(const expression_t *expression)
2763 {
2764         if (expression->kind != EXPR_REFERENCE)
2765                 return NULL;
2766
2767         return expression->reference.entity;
2768 }
2769
2770 /**
2771  * Transform an alignof expression into Firm code.
2772  */
2773 static ir_node *alignof_to_firm(const typeprop_expression_t *expression)
2774 {
2775         ir_entity *irentity = NULL;
2776
2777         const expression_t *tp_expression = expression->tp_expression;
2778         if (tp_expression != NULL) {
2779                 entity_t *entity = get_expression_entity(tp_expression);
2780                 if (entity != NULL && is_declaration(entity)) {
2781                         switch (entity->declaration.kind) {
2782                         case DECLARATION_KIND_UNKNOWN:
2783                                 panic("unknown entity reference found");
2784                         case DECLARATION_KIND_COMPOUND_MEMBER:
2785                                 irentity = entity->compound_member.entity;
2786                                 break;
2787                         case DECLARATION_KIND_GLOBAL_VARIABLE:
2788                         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY:
2789                                 irentity = entity->variable.v.entity;
2790                                 break;
2791                         case DECLARATION_KIND_PARAMETER_ENTITY:
2792                                 irentity = entity->parameter.v.entity;
2793                                 break;
2794                         case DECLARATION_KIND_FUNCTION:
2795                         case DECLARATION_KIND_INNER_FUNCTION:
2796                                 irentity = entity->function.entity;
2797                                 break;
2798                         case DECLARATION_KIND_PARAMETER:
2799                         case DECLARATION_KIND_LOCAL_VARIABLE:
2800                         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
2801                                 break;
2802                         }
2803                 }
2804         }
2805
2806         ir_type *irtype;
2807         if (irentity != NULL) {
2808                 irtype = get_entity_type(irentity);
2809         } else {
2810                 type_t *type = expression->type;
2811                 irtype = get_ir_type(type);
2812         }
2813
2814         ir_mode *const mode = get_ir_mode_arithmetic(expression->base.type);
2815         symconst_symbol sym;
2816         sym.type_p = irtype;
2817         return new_SymConst(mode, sym, symconst_type_align);
2818 }
2819
2820 static void init_ir_types(void);
2821
2822 long fold_constant(const expression_t *expression)
2823 {
2824         assert(is_type_valid(skip_typeref(expression->base.type)));
2825
2826         bool constant_folding_old = constant_folding;
2827         constant_folding = true;
2828
2829         init_ir_types();
2830
2831         assert(is_constant_expression(expression));
2832
2833         ir_graph *old_current_ir_graph = current_ir_graph;
2834         current_ir_graph = get_const_code_irg();
2835
2836         ir_node *cnst = expression_to_firm(expression);
2837         current_ir_graph = old_current_ir_graph;
2838
2839         if (!is_Const(cnst)) {
2840                 panic("couldn't fold constant");
2841         }
2842
2843         tarval *tv = get_Const_tarval(cnst);
2844         if (!tarval_is_long(tv)) {
2845                 panic("result of constant folding is not integer");
2846         }
2847
2848         constant_folding = constant_folding_old;
2849
2850         return get_tarval_long(tv);
2851 }
2852
2853 static ir_node *conditional_to_firm(const conditional_expression_t *expression)
2854 {
2855         dbg_info *const dbgi = get_dbg_info(&expression->base.source_position);
2856
2857         /* first try to fold a constant condition */
2858         if (is_constant_expression(expression->condition)) {
2859                 long val = fold_constant(expression->condition);
2860                 if (val) {
2861                         expression_t *true_expression = expression->true_expression;
2862                         if (true_expression == NULL)
2863                                 true_expression = expression->condition;
2864                         return expression_to_firm(true_expression);
2865                 } else {
2866                         return expression_to_firm(expression->false_expression);
2867                 }
2868         }
2869
2870         ir_node *cur_block   = get_cur_block();
2871
2872         /* create the true block */
2873         ir_node *true_block  = new_immBlock();
2874         set_cur_block(true_block);
2875
2876         ir_node *true_val = expression->true_expression != NULL ?
2877                 expression_to_firm(expression->true_expression) : NULL;
2878         ir_node *true_jmp = new_Jmp();
2879
2880         /* create the false block */
2881         ir_node *false_block = new_immBlock();
2882         set_cur_block(false_block);
2883
2884         ir_node *false_val = expression_to_firm(expression->false_expression);
2885         ir_node *false_jmp = new_Jmp();
2886
2887         /* create the condition evaluation */
2888         set_cur_block(cur_block);
2889         ir_node *const cond_expr = create_condition_evaluation(expression->condition, true_block, false_block);
2890         if (expression->true_expression == NULL) {
2891                 if (cond_expr != NULL) {
2892                         true_val = cond_expr;
2893                 } else {
2894                         /* Condition ended with a short circuit (&&, ||, !) operation.
2895                          * Generate a "1" as value for the true branch. */
2896                         true_val = new_Const(get_mode_one(mode_Is));
2897                 }
2898         }
2899         mature_immBlock(true_block);
2900         mature_immBlock(false_block);
2901
2902         /* create the common block */
2903         ir_node *in_cf[2] = { true_jmp, false_jmp };
2904         new_Block(2, in_cf);
2905
2906         /* TODO improve static semantics, so either both or no values are NULL */
2907         if (true_val == NULL || false_val == NULL)
2908                 return NULL;
2909
2910         ir_node *in[2] = { true_val, false_val };
2911         ir_mode *mode  = get_irn_mode(true_val);
2912         assert(get_irn_mode(false_val) == mode);
2913         ir_node *val   = new_d_Phi(dbgi, 2, in, mode);
2914
2915         return val;
2916 }
2917
2918 /**
2919  * Returns an IR-node representing the address of a field.
2920  */
2921 static ir_node *select_addr(const select_expression_t *expression)
2922 {
2923         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2924
2925         construct_select_compound(expression);
2926
2927         ir_node *compound_addr = expression_to_firm(expression->compound);
2928
2929         entity_t *entry = expression->compound_entry;
2930         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
2931         assert(entry->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
2932
2933         if (constant_folding) {
2934                 ir_mode *mode = get_irn_mode(compound_addr);
2935                 /* FIXME: here, we need an integer mode with the same number of bits as mode */
2936                 ir_node *ofs  = new_Const_long(mode_uint, entry->compound_member.offset);
2937                 return new_d_Add(dbgi, compound_addr, ofs, mode);
2938         } else {
2939                 ir_entity *irentity = entry->compound_member.entity;
2940                 assert(irentity != NULL);
2941                 return new_d_simpleSel(dbgi, new_NoMem(), compound_addr, irentity);
2942         }
2943 }
2944
2945 static ir_node *select_to_firm(const select_expression_t *expression)
2946 {
2947         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2948         ir_node  *addr = select_addr(expression);
2949         type_t   *type = revert_automatic_type_conversion(
2950                         (const expression_t*) expression);
2951         type           = skip_typeref(type);
2952
2953         entity_t *entry      = expression->compound_entry;
2954         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
2955         type_t   *entry_type = skip_typeref(entry->declaration.type);
2956
2957         if (entry_type->kind == TYPE_BITFIELD) {
2958                 return bitfield_extract_to_firm(expression, addr);
2959         }
2960
2961         return deref_address(dbgi, type, addr);
2962 }
2963
2964 /* Values returned by __builtin_classify_type. */
2965 typedef enum gcc_type_class
2966 {
2967         no_type_class = -1,
2968         void_type_class,
2969         integer_type_class,
2970         char_type_class,
2971         enumeral_type_class,
2972         boolean_type_class,
2973         pointer_type_class,
2974         reference_type_class,
2975         offset_type_class,
2976         real_type_class,
2977         complex_type_class,
2978         function_type_class,
2979         method_type_class,
2980         record_type_class,
2981         union_type_class,
2982         array_type_class,
2983         string_type_class,
2984         set_type_class,
2985         file_type_class,
2986         lang_type_class
2987 } gcc_type_class;
2988
2989 static ir_node *classify_type_to_firm(const classify_type_expression_t *const expr)
2990 {
2991         type_t *type = expr->type_expression->base.type;
2992
2993         /* FIXME gcc returns different values depending on whether compiling C or C++
2994          * e.g. int x[10] is pointer_type_class in C, but array_type_class in C++ */
2995         gcc_type_class tc;
2996         for (;;) {
2997                 type = skip_typeref(type);
2998                 switch (type->kind) {
2999                         case TYPE_ATOMIC: {
3000                                 const atomic_type_t *const atomic_type = &type->atomic;
3001                                 switch (atomic_type->akind) {
3002                                         /* should not be reached */
3003                                         case ATOMIC_TYPE_INVALID:
3004                                                 tc = no_type_class;
3005                                                 goto make_const;
3006
3007                                         /* gcc cannot do that */
3008                                         case ATOMIC_TYPE_VOID:
3009                                                 tc = void_type_class;
3010                                                 goto make_const;
3011
3012                                         case ATOMIC_TYPE_WCHAR_T:   /* gcc handles this as integer */
3013                                         case ATOMIC_TYPE_CHAR:      /* gcc handles this as integer */
3014                                         case ATOMIC_TYPE_SCHAR:     /* gcc handles this as integer */
3015                                         case ATOMIC_TYPE_UCHAR:     /* gcc handles this as integer */
3016                                         case ATOMIC_TYPE_SHORT:
3017                                         case ATOMIC_TYPE_USHORT:
3018                                         case ATOMIC_TYPE_INT:
3019                                         case ATOMIC_TYPE_UINT:
3020                                         case ATOMIC_TYPE_LONG:
3021                                         case ATOMIC_TYPE_ULONG:
3022                                         case ATOMIC_TYPE_LONGLONG:
3023                                         case ATOMIC_TYPE_ULONGLONG:
3024                                         case ATOMIC_TYPE_BOOL:      /* gcc handles this as integer */
3025                                                 tc = integer_type_class;
3026                                                 goto make_const;
3027
3028                                         case ATOMIC_TYPE_FLOAT:
3029                                         case ATOMIC_TYPE_DOUBLE:
3030                                         case ATOMIC_TYPE_LONG_DOUBLE:
3031                                                 tc = real_type_class;
3032                                                 goto make_const;
3033                                 }
3034                                 panic("Unexpected atomic type in classify_type_to_firm().");
3035                         }
3036
3037                         case TYPE_COMPLEX:         tc = complex_type_class; goto make_const;
3038                         case TYPE_IMAGINARY:       tc = complex_type_class; goto make_const;
3039                         case TYPE_BITFIELD:        tc = integer_type_class; goto make_const;
3040                         case TYPE_ARRAY:           /* gcc handles this as pointer */
3041                         case TYPE_FUNCTION:        /* gcc handles this as pointer */
3042                         case TYPE_POINTER:         tc = pointer_type_class; goto make_const;
3043                         case TYPE_COMPOUND_STRUCT: tc = record_type_class;  goto make_const;
3044                         case TYPE_COMPOUND_UNION:  tc = union_type_class;   goto make_const;
3045
3046                         /* gcc handles this as integer */
3047                         case TYPE_ENUM:            tc = integer_type_class; goto make_const;
3048
3049                         /* gcc classifies the referenced type */
3050                         case TYPE_REFERENCE: type = type->reference.refers_to; continue;
3051
3052                         case TYPE_BUILTIN:
3053                         /* typedef/typeof should be skipped already */
3054                         case TYPE_TYPEDEF:
3055                         case TYPE_TYPEOF:
3056                         case TYPE_INVALID:
3057                         case TYPE_ERROR:
3058                                 break;
3059                 }
3060                 panic("unexpected TYPE classify_type_to_firm().");
3061         }
3062
3063 make_const:;
3064         dbg_info *const dbgi = get_dbg_info(&expr->base.source_position);
3065         tarval   *const tv   = new_tarval_from_long(tc, mode_int);
3066         return new_d_Const(dbgi, tv);
3067 }
3068
3069 static ir_node *function_name_to_firm(
3070                 const funcname_expression_t *const expr)
3071 {
3072         switch(expr->kind) {
3073         case FUNCNAME_FUNCTION:
3074         case FUNCNAME_PRETTY_FUNCTION:
3075         case FUNCNAME_FUNCDNAME:
3076                 if (current_function_name == NULL) {
3077                         const source_position_t *const src_pos = &expr->base.source_position;
3078                         const char    *name  = current_function_entity->base.symbol->string;
3079                         const string_t string = { name, strlen(name) + 1 };
3080                         current_function_name = string_to_firm(src_pos, "__func__.%u", &string);
3081                 }
3082                 return current_function_name;
3083         case FUNCNAME_FUNCSIG:
3084                 if (current_funcsig == NULL) {
3085                         const source_position_t *const src_pos = &expr->base.source_position;
3086                         ir_entity *ent = get_irg_entity(current_ir_graph);
3087                         const char *const name = get_entity_ld_name(ent);
3088                         const string_t string = { name, strlen(name) + 1 };
3089                         current_funcsig = string_to_firm(src_pos, "__FUNCSIG__.%u", &string);
3090                 }
3091                 return current_funcsig;
3092         }
3093         panic("Unsupported function name");
3094 }
3095
3096 static ir_node *statement_expression_to_firm(const statement_expression_t *expr)
3097 {
3098         statement_t *statement = expr->statement;
3099
3100         assert(statement->kind == STATEMENT_COMPOUND);
3101         return compound_statement_to_firm(&statement->compound);
3102 }
3103
3104 static ir_node *va_start_expression_to_firm(
3105         const va_start_expression_t *const expr)
3106 {
3107         type_t    *const type        = current_function_entity->declaration.type;
3108         ir_type   *const method_type = get_ir_type(type);
3109         int        const n           = get_method_n_params(method_type) - 1;
3110         ir_entity *const parm_ent    = get_method_value_param_ent(method_type, n);
3111         ir_node   *const arg_base    = get_irg_value_param_base(current_ir_graph);
3112         dbg_info  *const dbgi        = get_dbg_info(&expr->base.source_position);
3113         ir_node   *const no_mem      = new_NoMem();
3114         ir_node   *const arg_sel     =
3115                 new_d_simpleSel(dbgi, no_mem, arg_base, parm_ent);
3116
3117         ir_node   *const cnst        = get_type_size(expr->parameter->base.type);
3118         ir_node   *const add         = new_d_Add(dbgi, arg_sel, cnst, mode_P_data);
3119         set_value_for_expression(expr->ap, add);
3120
3121         return NULL;
3122 }
3123
3124 static ir_node *va_arg_expression_to_firm(const va_arg_expression_t *const expr)
3125 {
3126         type_t       *const type    = expr->base.type;
3127         expression_t *const ap_expr = expr->ap;
3128         ir_node      *const ap_addr = expression_to_addr(ap_expr);
3129         ir_node      *const ap      = get_value_from_lvalue(ap_expr, ap_addr);
3130         dbg_info     *const dbgi    = get_dbg_info(&expr->base.source_position);
3131         ir_node      *const res     = deref_address(dbgi, type, ap);
3132
3133         ir_node      *const cnst    = get_type_size(expr->base.type);
3134         ir_node      *const add     = new_d_Add(dbgi, ap, cnst, mode_P_data);
3135
3136         set_value_for_expression_addr(ap_expr, add, ap_addr);
3137
3138         return res;
3139 }
3140
3141 static ir_node *dereference_addr(const unary_expression_t *const expression)
3142 {
3143         assert(expression->base.kind == EXPR_UNARY_DEREFERENCE);
3144         return expression_to_firm(expression->value);
3145 }
3146
3147 /**
3148  * Returns a IR-node representing an lvalue of the given expression.
3149  */
3150 static ir_node *expression_to_addr(const expression_t *expression)
3151 {
3152         switch(expression->kind) {
3153         case EXPR_ARRAY_ACCESS:
3154                 return array_access_addr(&expression->array_access);
3155         case EXPR_CALL:
3156                 return call_expression_to_firm(&expression->call);
3157         case EXPR_COMPOUND_LITERAL:
3158                 return compound_literal_to_firm(&expression->compound_literal);
3159         case EXPR_REFERENCE:
3160                 return reference_addr(&expression->reference);
3161         case EXPR_SELECT:
3162                 return select_addr(&expression->select);
3163         case EXPR_UNARY_DEREFERENCE:
3164                 return dereference_addr(&expression->unary);
3165         default:
3166                 break;
3167         }
3168         panic("trying to get address of non-lvalue");
3169 }
3170
3171 static ir_node *builtin_constant_to_firm(
3172                 const builtin_constant_expression_t *expression)
3173 {
3174         ir_mode *mode = get_ir_mode_arithmetic(expression->base.type);
3175         long     v;
3176
3177         if (is_constant_expression(expression->value)) {
3178                 v = 1;
3179         } else {
3180                 v = 0;
3181         }
3182         return new_Const_long(mode, v);
3183 }
3184
3185 static ir_node *builtin_types_compatible_to_firm(
3186                 const builtin_types_compatible_expression_t *expression)
3187 {
3188         type_t  *const left  = get_unqualified_type(skip_typeref(expression->left));
3189         type_t  *const right = get_unqualified_type(skip_typeref(expression->right));
3190         long     const value = types_compatible(left, right) ? 1 : 0;
3191         ir_mode *const mode  = get_ir_mode_arithmetic(expression->base.type);
3192         return new_Const_long(mode, value);
3193 }
3194
3195 static ir_node *builtin_prefetch_to_firm(
3196                 const builtin_prefetch_expression_t *expression)
3197 {
3198         ir_node *adr = expression_to_firm(expression->adr);
3199         /* no Firm support for prefetch yet */
3200         (void) adr;
3201         return NULL;
3202 }
3203
3204 static ir_node *get_label_block(label_t *label)
3205 {
3206         if (label->block != NULL)
3207                 return label->block;
3208
3209         /* beware: might be called from create initializer with current_ir_graph
3210          * set to const_code_irg. */
3211         ir_graph *rem    = current_ir_graph;
3212         current_ir_graph = current_function;
3213
3214         ir_node *block = new_immBlock();
3215
3216         label->block = block;
3217
3218         ARR_APP1(label_t *, all_labels, label);
3219
3220         current_ir_graph = rem;
3221         return block;
3222 }
3223
3224 /**
3225  * Pointer to a label.  This is used for the
3226  * GNU address-of-label extension.
3227  */
3228 static ir_node *label_address_to_firm(
3229                 const label_address_expression_t *label)
3230 {
3231         ir_node    *block = get_label_block(label->label);
3232         ir_label_t  nr    = get_Block_label(block);
3233
3234         if (nr == 0) {
3235                 nr = get_irp_next_label_nr();
3236                 set_Block_label(block, nr);
3237         }
3238         symconst_symbol value;
3239         value.label = nr;
3240         return new_SymConst(mode_P_code, value, symconst_label);
3241 }
3242
3243 static ir_node *builtin_symbol_to_firm(
3244                 const builtin_symbol_expression_t *expression)
3245 {
3246         /* for gcc compatibility we have to produce (dummy) addresses for some
3247          * builtins */
3248         if (warning.other) {
3249                 warningf(&expression->base.source_position,
3250                                  "taking address of builtin '%Y'", expression->symbol);
3251         }
3252
3253         /* simply create a NULL pointer */
3254         ir_mode  *mode = get_ir_mode_arithmetic(type_void_ptr);
3255         ir_node  *res  = new_Const_long(mode, 0);
3256
3257         return res;
3258 }
3259
3260 /**
3261  * creates firm nodes for an expression. The difference between this function
3262  * and expression_to_firm is, that this version might produce mode_b nodes
3263  * instead of mode_Is.
3264  */
3265 static ir_node *_expression_to_firm(const expression_t *expression)
3266 {
3267 #ifndef NDEBUG
3268         if (!constant_folding) {
3269                 assert(!expression->base.transformed);
3270                 ((expression_t*) expression)->base.transformed = true;
3271         }
3272 #endif
3273
3274         switch (expression->kind) {
3275         case EXPR_CHARACTER_CONSTANT:
3276                 return character_constant_to_firm(&expression->conste);
3277         case EXPR_WIDE_CHARACTER_CONSTANT:
3278                 return wide_character_constant_to_firm(&expression->conste);
3279         case EXPR_CONST:
3280                 return const_to_firm(&expression->conste);
3281         case EXPR_STRING_LITERAL:
3282                 return string_literal_to_firm(&expression->string);
3283         case EXPR_WIDE_STRING_LITERAL:
3284                 return wide_string_literal_to_firm(&expression->wide_string);
3285         case EXPR_REFERENCE:
3286                 return reference_expression_to_firm(&expression->reference);
3287         case EXPR_REFERENCE_ENUM_VALUE:
3288                 return reference_expression_enum_value_to_firm(&expression->reference);
3289         case EXPR_CALL:
3290                 return call_expression_to_firm(&expression->call);
3291         EXPR_UNARY_CASES
3292                 return unary_expression_to_firm(&expression->unary);
3293         EXPR_BINARY_CASES
3294                 return binary_expression_to_firm(&expression->binary);
3295         case EXPR_ARRAY_ACCESS:
3296                 return array_access_to_firm(&expression->array_access);
3297         case EXPR_SIZEOF:
3298                 return sizeof_to_firm(&expression->typeprop);
3299         case EXPR_ALIGNOF:
3300                 return alignof_to_firm(&expression->typeprop);
3301         case EXPR_CONDITIONAL:
3302                 return conditional_to_firm(&expression->conditional);
3303         case EXPR_SELECT:
3304                 return select_to_firm(&expression->select);
3305         case EXPR_CLASSIFY_TYPE:
3306                 return classify_type_to_firm(&expression->classify_type);
3307         case EXPR_FUNCNAME:
3308                 return function_name_to_firm(&expression->funcname);
3309         case EXPR_STATEMENT:
3310                 return statement_expression_to_firm(&expression->statement);
3311         case EXPR_VA_START:
3312                 return va_start_expression_to_firm(&expression->va_starte);
3313         case EXPR_VA_ARG:
3314                 return va_arg_expression_to_firm(&expression->va_arge);
3315         case EXPR_BUILTIN_SYMBOL:
3316                 return builtin_symbol_to_firm(&expression->builtin_symbol);
3317         case EXPR_BUILTIN_CONSTANT_P:
3318                 return builtin_constant_to_firm(&expression->builtin_constant);
3319         case EXPR_BUILTIN_TYPES_COMPATIBLE_P:
3320                 return builtin_types_compatible_to_firm(&expression->builtin_types_compatible);
3321         case EXPR_BUILTIN_PREFETCH:
3322                 return builtin_prefetch_to_firm(&expression->builtin_prefetch);
3323         case EXPR_OFFSETOF:
3324                 return offsetof_to_firm(&expression->offsetofe);
3325         case EXPR_COMPOUND_LITERAL:
3326                 return compound_literal_to_firm(&expression->compound_literal);
3327         case EXPR_LABEL_ADDRESS:
3328                 return label_address_to_firm(&expression->label_address);
3329
3330         case EXPR_UNKNOWN:
3331         case EXPR_INVALID:
3332                 break;
3333         }
3334         panic("invalid expression found");
3335 }
3336
3337 static bool is_builtin_expect(const expression_t *expression)
3338 {
3339         if (expression->kind != EXPR_CALL)
3340                 return false;
3341
3342         expression_t *function = expression->call.function;
3343         if (function->kind != EXPR_BUILTIN_SYMBOL)
3344                 return false;
3345         if (function->builtin_symbol.symbol->ID != T___builtin_expect)
3346                 return false;
3347
3348         return true;
3349 }
3350
3351 static bool produces_mode_b(const expression_t *expression)
3352 {
3353         switch (expression->kind) {
3354         case EXPR_BINARY_EQUAL:
3355         case EXPR_BINARY_NOTEQUAL:
3356         case EXPR_BINARY_LESS:
3357         case EXPR_BINARY_LESSEQUAL:
3358         case EXPR_BINARY_GREATER:
3359         case EXPR_BINARY_GREATEREQUAL:
3360         case EXPR_BINARY_ISGREATER:
3361         case EXPR_BINARY_ISGREATEREQUAL:
3362         case EXPR_BINARY_ISLESS:
3363         case EXPR_BINARY_ISLESSEQUAL:
3364         case EXPR_BINARY_ISLESSGREATER:
3365         case EXPR_BINARY_ISUNORDERED:
3366         case EXPR_UNARY_NOT:
3367                 return true;
3368
3369         case EXPR_CALL:
3370                 if (is_builtin_expect(expression)) {
3371                         expression_t *argument = expression->call.arguments->expression;
3372                         return produces_mode_b(argument);
3373                 }
3374                 return false;
3375         case EXPR_BINARY_COMMA:
3376                 return produces_mode_b(expression->binary.right);
3377
3378         default:
3379                 return false;
3380         }
3381 }
3382
3383 static ir_node *expression_to_firm(const expression_t *expression)
3384 {
3385         if (!produces_mode_b(expression)) {
3386                 ir_node *res = _expression_to_firm(expression);
3387                 assert(res == NULL || get_irn_mode(res) != mode_b);
3388                 return res;
3389         }
3390
3391         if (is_constant_expression(expression)) {
3392                 ir_node *res  = _expression_to_firm(expression);
3393                 ir_mode *mode = get_ir_mode_arithmetic(expression->base.type);
3394                 assert(is_Const(res));
3395                 if (is_Const_null(res)) {
3396                         return new_Const_long(mode, 0);
3397                 } else {
3398                         return new_Const_long(mode, 1);
3399                 }
3400         }
3401
3402         /* we have to produce a 0/1 from the mode_b expression */
3403         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3404         ir_mode  *mode = get_ir_mode_arithmetic(expression->base.type);
3405         return produce_condition_result(expression, mode, dbgi);
3406 }
3407
3408 /**
3409  * create a short-circuit expression evaluation that tries to construct
3410  * efficient control flow structures for &&, || and ! expressions
3411  */
3412 static ir_node *create_condition_evaluation(const expression_t *expression,
3413                                             ir_node *true_block,
3414                                             ir_node *false_block)
3415 {
3416         switch(expression->kind) {
3417         case EXPR_UNARY_NOT: {
3418                 const unary_expression_t *unary_expression = &expression->unary;
3419                 create_condition_evaluation(unary_expression->value, false_block,
3420                                             true_block);
3421                 return NULL;
3422         }
3423         case EXPR_BINARY_LOGICAL_AND: {
3424                 const binary_expression_t *binary_expression = &expression->binary;
3425
3426                 ir_node *extra_block = new_immBlock();
3427                 create_condition_evaluation(binary_expression->left, extra_block,
3428                                             false_block);
3429                 mature_immBlock(extra_block);
3430                 set_cur_block(extra_block);
3431                 create_condition_evaluation(binary_expression->right, true_block,
3432                                             false_block);
3433                 return NULL;
3434         }
3435         case EXPR_BINARY_LOGICAL_OR: {
3436                 const binary_expression_t *binary_expression = &expression->binary;
3437
3438                 ir_node *extra_block = new_immBlock();
3439                 create_condition_evaluation(binary_expression->left, true_block,
3440                                             extra_block);
3441                 mature_immBlock(extra_block);
3442                 set_cur_block(extra_block);
3443                 create_condition_evaluation(binary_expression->right, true_block,
3444                                             false_block);
3445                 return NULL;
3446         }
3447         default:
3448                 break;
3449         }
3450
3451         dbg_info *dbgi       = get_dbg_info(&expression->base.source_position);
3452         ir_node  *cond_expr  = _expression_to_firm(expression);
3453         ir_node  *condition  = create_conv(dbgi, cond_expr, mode_b);
3454         ir_node  *cond       = new_d_Cond(dbgi, condition);
3455         ir_node  *true_proj  = new_d_Proj(dbgi, cond, mode_X, pn_Cond_true);
3456         ir_node  *false_proj = new_d_Proj(dbgi, cond, mode_X, pn_Cond_false);
3457
3458         /* set branch prediction info based on __builtin_expect */
3459         if (is_builtin_expect(expression) && is_Cond(cond)) {
3460                 call_argument_t *argument = expression->call.arguments->next;
3461                 if (is_constant_expression(argument->expression)) {
3462                         long               cnst = fold_constant(argument->expression);
3463                         cond_jmp_predicate pred;
3464
3465                         if (cnst == 0) {
3466                                 pred = COND_JMP_PRED_FALSE;
3467                         } else {
3468                                 pred = COND_JMP_PRED_TRUE;
3469                         }
3470                         set_Cond_jmp_pred(cond, pred);
3471                 }
3472         }
3473
3474         add_immBlock_pred(true_block, true_proj);
3475         add_immBlock_pred(false_block, false_proj);
3476
3477         set_cur_block(NULL);
3478         return cond_expr;
3479 }
3480
3481
3482 static void create_variable_entity(entity_t *variable,
3483                                    declaration_kind_t declaration_kind,
3484                                    ir_type *parent_type)
3485 {
3486         assert(variable->kind == ENTITY_VARIABLE);
3487         type_t    *type = skip_typeref(variable->declaration.type);
3488         type            = get_aligned_type(type, variable->variable.alignment);
3489
3490         ident     *const id       = new_id_from_str(variable->base.symbol->string);
3491         ir_type   *const irtype   = get_ir_type(type);
3492         dbg_info  *const dbgi     = get_dbg_info(&variable->base.source_position);
3493
3494         ir_entity *const irentity = new_d_entity(parent_type, id, irtype, dbgi);
3495
3496         handle_gnu_attributes_ent(irentity, variable);
3497
3498         variable->declaration.kind  = (unsigned char) declaration_kind;
3499         variable->variable.v.entity = irentity;
3500         set_entity_variability(irentity, variability_uninitialized);
3501         set_entity_ld_ident(irentity, create_ld_ident(variable));
3502
3503         if (parent_type == get_tls_type())
3504                 set_entity_allocation(irentity, allocation_automatic);
3505         else if (declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE)
3506                 set_entity_allocation(irentity, allocation_static);
3507
3508         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
3509                 set_entity_volatility(irentity, volatility_is_volatile);
3510         }
3511 }
3512
3513
3514 typedef struct type_path_entry_t type_path_entry_t;
3515 struct type_path_entry_t {
3516         type_t           *type;
3517         ir_initializer_t *initializer;
3518         size_t            index;
3519         entity_t         *compound_entry;
3520 };
3521
3522 typedef struct type_path_t type_path_t;
3523 struct type_path_t {
3524         type_path_entry_t *path;
3525         type_t            *top_type;
3526         bool               invalid;
3527 };
3528
3529 static __attribute__((unused)) void debug_print_type_path(const type_path_t *path)
3530 {
3531         size_t len = ARR_LEN(path->path);
3532
3533         for (size_t i = 0; i < len; ++i) {
3534                 const type_path_entry_t *entry = & path->path[i];
3535
3536                 type_t *type = skip_typeref(entry->type);
3537                 if (is_type_compound(type)) {
3538                         fprintf(stderr, ".%s", entry->compound_entry->base.symbol->string);
3539                 } else if (is_type_array(type)) {
3540                         fprintf(stderr, "[%u]", (unsigned) entry->index);
3541                 } else {
3542                         fprintf(stderr, "-INVALID-");
3543                 }
3544         }
3545         fprintf(stderr, "  (");
3546         print_type(path->top_type);
3547         fprintf(stderr, ")");
3548 }
3549
3550 static type_path_entry_t *get_type_path_top(const type_path_t *path)
3551 {
3552         size_t len = ARR_LEN(path->path);
3553         assert(len > 0);
3554         return & path->path[len-1];
3555 }
3556
3557 static type_path_entry_t *append_to_type_path(type_path_t *path)
3558 {
3559         size_t len = ARR_LEN(path->path);
3560         ARR_RESIZE(type_path_entry_t, path->path, len+1);
3561
3562         type_path_entry_t *result = & path->path[len];
3563         memset(result, 0, sizeof(result[0]));
3564         return result;
3565 }
3566
3567 static size_t get_compound_member_count(const compound_type_t *type)
3568 {
3569         compound_t *compound  = type->compound;
3570         size_t      n_members = 0;
3571         entity_t   *member    = compound->members.entities;
3572         for ( ; member != NULL; member = member->base.next) {
3573                 ++n_members;
3574         }
3575
3576         return n_members;
3577 }
3578
3579 static ir_initializer_t *get_initializer_entry(type_path_t *path)
3580 {
3581         type_t *orig_top_type = path->top_type;
3582         type_t *top_type      = skip_typeref(orig_top_type);
3583
3584         assert(is_type_compound(top_type) || is_type_array(top_type));
3585
3586         if (ARR_LEN(path->path) == 0) {
3587                 return NULL;
3588         } else {
3589                 type_path_entry_t *top         = get_type_path_top(path);
3590                 ir_initializer_t  *initializer = top->initializer;
3591                 return get_initializer_compound_value(initializer, top->index);
3592         }
3593 }
3594
3595 static void descend_into_subtype(type_path_t *path)
3596 {
3597         type_t *orig_top_type = path->top_type;
3598         type_t *top_type      = skip_typeref(orig_top_type);
3599
3600         assert(is_type_compound(top_type) || is_type_array(top_type));
3601
3602         ir_initializer_t *initializer = get_initializer_entry(path);
3603
3604         type_path_entry_t *top = append_to_type_path(path);
3605         top->type              = top_type;
3606
3607         size_t len;
3608
3609         if (is_type_compound(top_type)) {
3610                 compound_t *compound = top_type->compound.compound;
3611                 entity_t   *entry    = compound->members.entities;
3612
3613                 top->compound_entry = entry;
3614                 top->index          = 0;
3615                 len                 = get_compound_member_count(&top_type->compound);
3616                 if (entry != NULL) {
3617                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3618                         path->top_type = entry->declaration.type;
3619                 }
3620         } else {
3621                 assert(is_type_array(top_type));
3622                 assert(top_type->array.size > 0);
3623
3624                 top->index     = 0;
3625                 path->top_type = top_type->array.element_type;
3626                 len            = top_type->array.size;
3627         }
3628         if (initializer == NULL
3629                         || get_initializer_kind(initializer) == IR_INITIALIZER_NULL) {
3630                 initializer = create_initializer_compound(len);
3631                 /* we have to set the entry at the 2nd latest path entry... */
3632                 size_t path_len = ARR_LEN(path->path);
3633                 assert(path_len >= 1);
3634                 if (path_len > 1) {
3635                         type_path_entry_t *entry        = & path->path[path_len-2];
3636                         ir_initializer_t  *tinitializer = entry->initializer;
3637                         set_initializer_compound_value(tinitializer, entry->index,
3638                                                        initializer);
3639                 }
3640         }
3641         top->initializer = initializer;
3642 }
3643
3644 static void ascend_from_subtype(type_path_t *path)
3645 {
3646         type_path_entry_t *top = get_type_path_top(path);
3647
3648         path->top_type = top->type;
3649
3650         size_t len = ARR_LEN(path->path);
3651         ARR_RESIZE(type_path_entry_t, path->path, len-1);
3652 }
3653
3654 static void walk_designator(type_path_t *path, const designator_t *designator)
3655 {
3656         /* designators start at current object type */
3657         ARR_RESIZE(type_path_entry_t, path->path, 1);
3658
3659         for ( ; designator != NULL; designator = designator->next) {
3660                 type_path_entry_t *top         = get_type_path_top(path);
3661                 type_t            *orig_type   = top->type;
3662                 type_t            *type        = skip_typeref(orig_type);
3663
3664                 if (designator->symbol != NULL) {
3665                         assert(is_type_compound(type));
3666                         size_t    index  = 0;
3667                         symbol_t *symbol = designator->symbol;
3668
3669                         compound_t *compound = type->compound.compound;
3670                         entity_t   *iter     = compound->members.entities;
3671                         for ( ; iter != NULL; iter = iter->base.next, ++index) {
3672                                 if (iter->base.symbol == symbol) {
3673                                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
3674                                         break;
3675                                 }
3676                         }
3677                         assert(iter != NULL);
3678
3679                         top->type           = orig_type;
3680                         top->compound_entry = iter;
3681                         top->index          = index;
3682                         orig_type           = iter->declaration.type;
3683                 } else {
3684                         expression_t *array_index = designator->array_index;
3685                         assert(designator->array_index != NULL);
3686                         assert(is_type_array(type));
3687
3688                         long index = fold_constant(array_index);
3689                         assert(index >= 0);
3690 #ifndef NDEBUG
3691                         if (type->array.size_constant) {
3692                                 long array_size = type->array.size;
3693                                 assert(index < array_size);
3694                         }
3695 #endif
3696
3697                         top->type  = orig_type;
3698                         top->index = (size_t) index;
3699                         orig_type  = type->array.element_type;
3700                 }
3701                 path->top_type = orig_type;
3702
3703                 if (designator->next != NULL) {
3704                         descend_into_subtype(path);
3705                 }
3706         }
3707
3708         path->invalid  = false;
3709 }
3710
3711 static void advance_current_object(type_path_t *path)
3712 {
3713         if (path->invalid) {
3714                 /* TODO: handle this... */
3715                 panic("invalid initializer in ast2firm (excessive elements)");
3716         }
3717
3718         type_path_entry_t *top = get_type_path_top(path);
3719
3720         type_t *type = skip_typeref(top->type);
3721         if (is_type_union(type)) {
3722                 top->compound_entry = NULL;
3723         } else if (is_type_struct(type)) {
3724                 entity_t *entry = top->compound_entry;
3725
3726                 top->index++;
3727                 entry               = entry->base.next;
3728                 top->compound_entry = entry;
3729                 if (entry != NULL) {
3730                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3731                         path->top_type = entry->declaration.type;
3732                         return;
3733                 }
3734         } else {
3735                 assert(is_type_array(type));
3736
3737                 top->index++;
3738                 if (!type->array.size_constant || top->index < type->array.size) {
3739                         return;
3740                 }
3741         }
3742
3743         /* we're past the last member of the current sub-aggregate, try if we
3744          * can ascend in the type hierarchy and continue with another subobject */
3745         size_t len = ARR_LEN(path->path);
3746
3747         if (len > 1) {
3748                 ascend_from_subtype(path);
3749                 advance_current_object(path);
3750         } else {
3751                 path->invalid = true;
3752         }
3753 }
3754
3755
3756 static ir_initializer_t *create_ir_initializer(
3757                 const initializer_t *initializer, type_t *type);
3758
3759 static ir_initializer_t *create_ir_initializer_value(
3760                 const initializer_value_t *initializer)
3761 {
3762         if (is_type_compound(initializer->value->base.type)) {
3763                 panic("initializer creation for compounds not implemented yet");
3764         }
3765         ir_node *value = expression_to_firm(initializer->value);
3766         type_t  *type  = initializer->value->base.type;
3767         ir_mode *mode  = get_ir_mode_storage(type);
3768         value          = create_conv(NULL, value, mode);
3769         return create_initializer_const(value);
3770 }
3771
3772 /** test wether type can be initialized by a string constant */
3773 static bool is_string_type(type_t *type)
3774 {
3775         type_t *inner;
3776         if (is_type_pointer(type)) {
3777                 inner = skip_typeref(type->pointer.points_to);
3778         } else if(is_type_array(type)) {
3779                 inner = skip_typeref(type->array.element_type);
3780         } else {
3781                 return false;
3782         }
3783
3784         return is_type_integer(inner);
3785 }
3786
3787 static ir_initializer_t *create_ir_initializer_list(
3788                 const initializer_list_t *initializer, type_t *type)
3789 {
3790         type_path_t path;
3791         memset(&path, 0, sizeof(path));
3792         path.top_type = type;
3793         path.path     = NEW_ARR_F(type_path_entry_t, 0);
3794
3795         descend_into_subtype(&path);
3796
3797         for (size_t i = 0; i < initializer->len; ++i) {
3798                 const initializer_t *sub_initializer = initializer->initializers[i];
3799
3800                 if (sub_initializer->kind == INITIALIZER_DESIGNATOR) {
3801                         walk_designator(&path, sub_initializer->designator.designator);
3802                         continue;
3803                 }
3804
3805                 if (sub_initializer->kind == INITIALIZER_VALUE) {
3806                         /* we might have to descend into types until we're at a scalar
3807                          * type */
3808                         while(true) {
3809                                 type_t *orig_top_type = path.top_type;
3810                                 type_t *top_type      = skip_typeref(orig_top_type);
3811
3812                                 if (is_type_scalar(top_type))
3813                                         break;
3814                                 descend_into_subtype(&path);
3815                         }
3816                 } else if (sub_initializer->kind == INITIALIZER_STRING
3817                                 || sub_initializer->kind == INITIALIZER_WIDE_STRING) {
3818                         /* we might have to descend into types until we're at a scalar
3819                          * type */
3820                         while (true) {
3821                                 type_t *orig_top_type = path.top_type;
3822                                 type_t *top_type      = skip_typeref(orig_top_type);
3823
3824                                 if (is_string_type(top_type))
3825                                         break;
3826                                 descend_into_subtype(&path);
3827                         }
3828                 }
3829
3830                 ir_initializer_t *sub_irinitializer
3831                         = create_ir_initializer(sub_initializer, path.top_type);
3832
3833                 size_t path_len = ARR_LEN(path.path);
3834                 assert(path_len >= 1);
3835                 type_path_entry_t *entry        = & path.path[path_len-1];
3836                 ir_initializer_t  *tinitializer = entry->initializer;
3837                 set_initializer_compound_value(tinitializer, entry->index,
3838                                                sub_irinitializer);
3839
3840                 advance_current_object(&path);
3841         }
3842
3843         assert(ARR_LEN(path.path) >= 1);
3844         ir_initializer_t *result = path.path[0].initializer;
3845         DEL_ARR_F(path.path);
3846
3847         return result;
3848 }
3849
3850 static ir_initializer_t *create_ir_initializer_string(
3851                 const initializer_string_t *initializer, type_t *type)
3852 {
3853         type = skip_typeref(type);
3854
3855         size_t            string_len    = initializer->string.size;
3856         assert(type->kind == TYPE_ARRAY);
3857         assert(type->array.size_constant);
3858         size_t            len           = type->array.size;
3859         ir_initializer_t *irinitializer = create_initializer_compound(len);
3860
3861         const char *string = initializer->string.begin;
3862         ir_mode    *mode   = get_ir_mode_storage(type->array.element_type);
3863
3864         for (size_t i = 0; i < len; ++i) {
3865                 char c = 0;
3866                 if (i < string_len)
3867                         c = string[i];
3868
3869                 tarval           *tv = new_tarval_from_long(c, mode);
3870                 ir_initializer_t *char_initializer = create_initializer_tarval(tv);
3871
3872                 set_initializer_compound_value(irinitializer, i, char_initializer);
3873         }
3874
3875         return irinitializer;
3876 }
3877
3878 static ir_initializer_t *create_ir_initializer_wide_string(
3879                 const initializer_wide_string_t *initializer, type_t *type)
3880 {
3881         size_t            string_len    = initializer->string.size;
3882         assert(type->kind == TYPE_ARRAY);
3883         assert(type->array.size_constant);
3884         size_t            len           = type->array.size;
3885         ir_initializer_t *irinitializer = create_initializer_compound(len);
3886
3887         const wchar_rep_t *string = initializer->string.begin;
3888         ir_mode           *mode   = get_type_mode(ir_type_wchar_t);
3889
3890         for (size_t i = 0; i < len; ++i) {
3891                 wchar_rep_t c = 0;
3892                 if (i < string_len) {
3893                         c = string[i];
3894                 }
3895                 tarval *tv = new_tarval_from_long(c, mode);
3896                 ir_initializer_t *char_initializer = create_initializer_tarval(tv);
3897
3898                 set_initializer_compound_value(irinitializer, i, char_initializer);
3899         }
3900
3901         return irinitializer;
3902 }
3903
3904 static ir_initializer_t *create_ir_initializer(
3905                 const initializer_t *initializer, type_t *type)
3906 {
3907         switch(initializer->kind) {
3908                 case INITIALIZER_STRING:
3909                         return create_ir_initializer_string(&initializer->string, type);
3910
3911                 case INITIALIZER_WIDE_STRING:
3912                         return create_ir_initializer_wide_string(&initializer->wide_string,
3913                                                                  type);
3914
3915                 case INITIALIZER_LIST:
3916                         return create_ir_initializer_list(&initializer->list, type);
3917
3918                 case INITIALIZER_VALUE:
3919                         return create_ir_initializer_value(&initializer->value);
3920
3921                 case INITIALIZER_DESIGNATOR:
3922                         panic("unexpected designator initializer found");
3923         }
3924         panic("unknown initializer");
3925 }
3926
3927 static void create_dynamic_null_initializer(ir_type *type, dbg_info *dbgi,
3928                 ir_node *base_addr)
3929 {
3930         if (is_atomic_type(type)) {
3931                 ir_mode *mode = get_type_mode(type);
3932                 tarval  *zero = get_mode_null(mode);
3933                 ir_node *cnst = new_d_Const(dbgi, zero);
3934
3935                 /* TODO: bitfields */
3936                 ir_node *mem    = get_store();
3937                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, cnst, cons_none);
3938                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
3939                 set_store(proj_m);
3940         } else {
3941                 assert(is_compound_type(type));
3942
3943                 int n_members;
3944                 if (is_Array_type(type)) {
3945                         assert(has_array_upper_bound(type, 0));
3946                         n_members = get_array_upper_bound_int(type, 0);
3947                 } else {
3948                         n_members = get_compound_n_members(type);
3949                 }
3950
3951                 for (int i = 0; i < n_members; ++i) {
3952                         ir_node *addr;
3953                         ir_type *irtype;
3954                         if (is_Array_type(type)) {
3955                                 ir_entity *entity   = get_array_element_entity(type);
3956                                 tarval    *index_tv = new_tarval_from_long(i, mode_uint);
3957                                 ir_node   *cnst     = new_d_Const(dbgi, index_tv);
3958                                 ir_node   *in[1]    = { cnst };
3959                                 irtype = get_array_element_type(type);
3960                                 addr   = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in, entity);
3961                         } else {
3962                                 ir_entity *member = get_compound_member(type, i);
3963
3964                                 irtype = get_entity_type(member);
3965                                 addr   = new_d_simpleSel(dbgi, new_NoMem(), base_addr, member);
3966                         }
3967
3968                         create_dynamic_null_initializer(irtype, dbgi, addr);
3969                 }
3970         }
3971 }
3972
3973 static void create_dynamic_initializer_sub(ir_initializer_t *initializer,
3974                 ir_entity *entity, ir_type *type, dbg_info *dbgi, ir_node *base_addr)
3975 {
3976         switch(get_initializer_kind(initializer)) {
3977         case IR_INITIALIZER_NULL: {
3978                 create_dynamic_null_initializer(type, dbgi, base_addr);
3979                 return;
3980         }
3981         case IR_INITIALIZER_CONST: {
3982                 ir_node *node     = get_initializer_const_value(initializer);
3983                 ir_mode *mode     = get_irn_mode(node);
3984                 ir_type *ent_type = get_entity_type(entity);
3985
3986                 /* is it a bitfield type? */
3987                 if (is_Primitive_type(ent_type) &&
3988                                 get_primitive_base_type(ent_type) != NULL) {
3989                         bitfield_store_to_firm(dbgi, entity, base_addr, node, false);
3990                         return;
3991                 }
3992
3993                 assert(get_type_mode(type) == mode);
3994                 ir_node *mem    = get_store();
3995                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, node, cons_none);
3996                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
3997                 set_store(proj_m);
3998                 return;
3999         }
4000         case IR_INITIALIZER_TARVAL: {
4001                 tarval  *tv       = get_initializer_tarval_value(initializer);
4002                 ir_mode *mode     = get_tarval_mode(tv);
4003                 ir_node *cnst     = new_d_Const(dbgi, tv);
4004                 ir_type *ent_type = get_entity_type(entity);
4005
4006                 /* is it a bitfield type? */
4007                 if (is_Primitive_type(ent_type) &&
4008                                 get_primitive_base_type(ent_type) != NULL) {
4009                         bitfield_store_to_firm(dbgi, entity, base_addr, cnst, false);
4010                         return;
4011                 }
4012
4013                 assert(get_type_mode(type) == mode);
4014                 ir_node *mem    = get_store();
4015                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, cnst, cons_none);
4016                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4017                 set_store(proj_m);
4018                 return;
4019         }
4020         case IR_INITIALIZER_COMPOUND: {
4021                 assert(is_compound_type(type));
4022                 int n_members;
4023                 if (is_Array_type(type)) {
4024                         assert(has_array_upper_bound(type, 0));
4025                         n_members = get_array_upper_bound_int(type, 0);
4026                 } else {
4027                         n_members = get_compound_n_members(type);
4028                 }
4029
4030                 if (get_initializer_compound_n_entries(initializer)
4031                                 != (unsigned) n_members)
4032                         panic("initializer doesn't match compound type");
4033
4034                 for (int i = 0; i < n_members; ++i) {
4035                         ir_node   *addr;
4036                         ir_type   *irtype;
4037                         ir_entity *sub_entity;
4038                         if (is_Array_type(type)) {
4039                                 tarval    *index_tv = new_tarval_from_long(i, mode_uint);
4040                                 ir_node   *cnst     = new_d_Const(dbgi, index_tv);
4041                                 ir_node   *in[1]    = { cnst };
4042                                 irtype     = get_array_element_type(type);
4043                                 sub_entity = get_array_element_entity(type);
4044                                 addr       = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in,
4045                                                        sub_entity);
4046                         } else {
4047                                 sub_entity = get_compound_member(type, i);
4048                                 irtype     = get_entity_type(sub_entity);
4049                                 addr       = new_d_simpleSel(dbgi, new_NoMem(), base_addr,
4050                                                              sub_entity);
4051                         }
4052
4053                         ir_initializer_t *sub_init
4054                                 = get_initializer_compound_value(initializer, i);
4055
4056                         create_dynamic_initializer_sub(sub_init, sub_entity, irtype, dbgi,
4057                                                        addr);
4058                 }
4059                 return;
4060         }
4061         }
4062
4063         panic("invalid IR_INITIALIZER found");
4064 }
4065
4066 static void create_dynamic_initializer(ir_initializer_t *initializer,
4067                 dbg_info *dbgi, ir_entity *entity)
4068 {
4069         ir_node *frame     = get_local_frame(entity);
4070         ir_node *base_addr = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
4071         ir_type *type      = get_entity_type(entity);
4072
4073         create_dynamic_initializer_sub(initializer, entity, type, dbgi, base_addr);
4074 }
4075
4076 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
4077                                      ir_entity *entity, type_t *type)
4078 {
4079         ir_node *memory = get_store();
4080         ir_node *nomem  = new_NoMem();
4081         ir_node *frame  = get_irg_frame(current_ir_graph);
4082         ir_node *addr   = new_d_simpleSel(dbgi, nomem, frame, entity);
4083
4084         if (initializer->kind == INITIALIZER_VALUE) {
4085                 initializer_value_t *initializer_value = &initializer->value;
4086
4087                 ir_node *value = expression_to_firm(initializer_value->value);
4088                 type = skip_typeref(type);
4089                 assign_value(dbgi, addr, type, value);
4090                 return;
4091         }
4092
4093         if (!is_constant_initializer(initializer)) {
4094                 ir_initializer_t *irinitializer
4095                         = create_ir_initializer(initializer, type);
4096
4097                 create_dynamic_initializer(irinitializer, dbgi, entity);
4098                 return;
4099         }
4100
4101         /* create the ir_initializer */
4102         ir_graph *const old_current_ir_graph = current_ir_graph;
4103         current_ir_graph = get_const_code_irg();
4104
4105         ir_initializer_t *irinitializer = create_ir_initializer(initializer, type);
4106
4107         assert(current_ir_graph == get_const_code_irg());
4108         current_ir_graph = old_current_ir_graph;
4109
4110         /* create a "template" entity which is copied to the entity on the stack */
4111         ident     *const id          = id_unique("initializer.%u");
4112         ir_type   *const irtype      = get_ir_type(type);
4113         ir_type   *const global_type = get_glob_type();
4114         ir_entity *const init_entity = new_d_entity(global_type, id, irtype, dbgi);
4115         set_entity_ld_ident(init_entity, id);
4116
4117         set_entity_variability(init_entity, variability_initialized);
4118         set_entity_visibility(init_entity, visibility_local);
4119         set_entity_allocation(init_entity, allocation_static);
4120
4121         set_entity_initializer(init_entity, irinitializer);
4122
4123         ir_node *const src_addr = create_symconst(dbgi, mode_P_data, init_entity);
4124         ir_node *const copyb    = new_d_CopyB(dbgi, memory, addr, src_addr, irtype);
4125
4126         ir_node *const copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M_regular);
4127         set_store(copyb_mem);
4128 }
4129
4130 static void create_initializer_local_variable_entity(entity_t *entity)
4131 {
4132         assert(entity->kind == ENTITY_VARIABLE);
4133         initializer_t *initializer = entity->variable.initializer;
4134         dbg_info      *dbgi        = get_dbg_info(&entity->base.source_position);
4135         ir_entity     *irentity    = entity->variable.v.entity;
4136         type_t        *type        = entity->declaration.type;
4137
4138         type = get_aligned_type(type, entity->variable.alignment);
4139         create_local_initializer(initializer, dbgi, irentity, type);
4140 }
4141
4142 static void create_variable_initializer(entity_t *entity)
4143 {
4144         assert(entity->kind == ENTITY_VARIABLE);
4145         initializer_t *initializer = entity->variable.initializer;
4146         if (initializer == NULL)
4147                 return;
4148
4149         declaration_kind_t declaration_kind
4150                 = (declaration_kind_t) entity->declaration.kind;
4151         if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY) {
4152                 create_initializer_local_variable_entity(entity);
4153                 return;
4154         }
4155
4156         type_t            *type = entity->declaration.type;
4157         type_qualifiers_t  tq   = get_type_qualifier(type, true);
4158
4159         if (initializer->kind == INITIALIZER_VALUE) {
4160                 initializer_value_t *initializer_value = &initializer->value;
4161                 dbg_info            *dbgi = get_dbg_info(&entity->base.source_position);
4162
4163                 ir_node *value = expression_to_firm(initializer_value->value);
4164
4165                 type_t  *type = initializer_value->value->base.type;
4166                 ir_mode *mode = get_ir_mode_storage(type);
4167                 value = create_conv(dbgi, value, mode);
4168                 value = do_strict_conv(dbgi, value);
4169
4170                 if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE) {
4171                         set_value(entity->variable.v.value_number, value);
4172                 } else {
4173                         assert(declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4174
4175                         ir_entity *irentity = entity->variable.v.entity;
4176
4177                         if (tq & TYPE_QUALIFIER_CONST) {
4178                                 set_entity_variability(irentity, variability_constant);
4179                         } else {
4180                                 set_entity_variability(irentity, variability_initialized);
4181                         }
4182                         set_atomic_ent_value(irentity, value);
4183                 }
4184         } else {
4185                 assert(declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY ||
4186                        declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4187
4188                 ir_entity        *irentity        = entity->variable.v.entity;
4189                 ir_initializer_t *irinitializer
4190                         = create_ir_initializer(initializer, type);
4191
4192                 if (tq & TYPE_QUALIFIER_CONST) {
4193                         set_entity_variability(irentity, variability_constant);
4194                 } else {
4195                         set_entity_variability(irentity, variability_initialized);
4196                 }
4197                 set_entity_initializer(irentity, irinitializer);
4198         }
4199 }
4200
4201 static void create_variable_length_array(entity_t *entity)
4202 {
4203         assert(entity->kind == ENTITY_VARIABLE);
4204         assert(entity->variable.initializer == NULL);
4205
4206         entity->declaration.kind    = DECLARATION_KIND_VARIABLE_LENGTH_ARRAY;
4207         entity->variable.v.vla_base = NULL;
4208
4209         /* TODO: record VLA somewhere so we create the free node when we leave
4210          * it's scope */
4211 }
4212
4213 static void allocate_variable_length_array(entity_t *entity)
4214 {
4215         assert(entity->kind == ENTITY_VARIABLE);
4216         assert(entity->variable.initializer == NULL);
4217         assert(get_cur_block() != NULL);
4218
4219         dbg_info *dbgi      = get_dbg_info(&entity->base.source_position);
4220         type_t   *type      = entity->declaration.type;
4221         ir_type  *el_type   = get_ir_type(type->array.element_type);
4222
4223         /* make sure size_node is calculated */
4224         get_type_size(type);
4225         ir_node  *elems = type->array.size_node;
4226         ir_node  *mem   = get_store();
4227         ir_node  *alloc = new_d_Alloc(dbgi, mem, elems, el_type, stack_alloc);
4228
4229         ir_node  *proj_m = new_d_Proj(dbgi, alloc, mode_M, pn_Alloc_M);
4230         ir_node  *addr   = new_d_Proj(dbgi, alloc, mode_P_data, pn_Alloc_res);
4231         set_store(proj_m);
4232
4233         assert(entity->declaration.kind == DECLARATION_KIND_VARIABLE_LENGTH_ARRAY);
4234         entity->variable.v.vla_base = addr;
4235 }
4236
4237 /**
4238  * Creates a Firm local variable from a declaration.
4239  */
4240 static void create_local_variable(entity_t *entity)
4241 {
4242         assert(entity->kind == ENTITY_VARIABLE);
4243         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4244
4245         bool needs_entity = entity->variable.address_taken;
4246         type_t *type = skip_typeref(entity->declaration.type);
4247
4248         /* is it a variable length array? */
4249         if (is_type_array(type) && !type->array.size_constant) {
4250                 create_variable_length_array(entity);
4251                 return;
4252         } else if (is_type_array(type) || is_type_compound(type)) {
4253                 needs_entity = true;
4254         } else if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
4255                 needs_entity = true;
4256         }
4257
4258         if (needs_entity) {
4259                 ir_type *frame_type = get_irg_frame_type(current_ir_graph);
4260                 create_variable_entity(entity,
4261                                        DECLARATION_KIND_LOCAL_VARIABLE_ENTITY,
4262                                        frame_type);
4263         } else {
4264                 entity->declaration.kind        = DECLARATION_KIND_LOCAL_VARIABLE;
4265                 entity->variable.v.value_number = next_value_number_function;
4266                 set_irg_loc_description(current_ir_graph, next_value_number_function,
4267                                         entity);
4268                 ++next_value_number_function;
4269         }
4270 }
4271
4272 static void create_local_static_variable(entity_t *entity)
4273 {
4274         assert(entity->kind == ENTITY_VARIABLE);
4275         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4276
4277         type_t    *type = skip_typeref(entity->declaration.type);
4278         type            = get_aligned_type(type, entity->variable.alignment);
4279
4280         ir_type   *const var_type = entity->variable.thread_local ?
4281                 get_tls_type() : get_glob_type();
4282         ir_type   *const irtype   = get_ir_type(type);
4283         dbg_info  *const dbgi     = get_dbg_info(&entity->base.source_position);
4284
4285         size_t l = strlen(entity->base.symbol->string);
4286         char   buf[l + sizeof(".%u")];
4287         snprintf(buf, sizeof(buf), "%s.%%u", entity->base.symbol->string);
4288         ident     *const id = id_unique(buf);
4289
4290         ir_entity *const irentity = new_d_entity(var_type, id, irtype, dbgi);
4291
4292         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
4293                 set_entity_volatility(irentity, volatility_is_volatile);
4294         }
4295
4296         entity->declaration.kind  = DECLARATION_KIND_GLOBAL_VARIABLE;
4297         entity->variable.v.entity = irentity;
4298
4299         set_entity_ld_ident(irentity, id);
4300         set_entity_variability(irentity, variability_uninitialized);
4301         set_entity_visibility(irentity, visibility_local);
4302         set_entity_allocation(irentity, entity->variable.thread_local ?
4303                 allocation_automatic : allocation_static);
4304
4305         ir_graph *const old_current_ir_graph = current_ir_graph;
4306         current_ir_graph = get_const_code_irg();
4307
4308         create_variable_initializer(entity);
4309
4310         assert(current_ir_graph == get_const_code_irg());
4311         current_ir_graph = old_current_ir_graph;
4312 }
4313
4314
4315
4316 static void return_statement_to_firm(return_statement_t *statement)
4317 {
4318         if (get_cur_block() == NULL)
4319                 return;
4320
4321         dbg_info *dbgi        = get_dbg_info(&statement->base.source_position);
4322         type_t   *type        = current_function_entity->declaration.type;
4323         ir_type  *func_irtype = get_ir_type(type);
4324
4325
4326         ir_node *in[1];
4327         int      in_len;
4328         if (get_method_n_ress(func_irtype) > 0) {
4329                 ir_type *res_type = get_method_res_type(func_irtype, 0);
4330
4331                 if (statement->value != NULL) {
4332                         ir_node *node = expression_to_firm(statement->value);
4333                         if (!is_compound_type(res_type)) {
4334                                 type_t  *type = statement->value->base.type;
4335                                 ir_mode *mode = get_ir_mode_storage(type);
4336                                 node          = create_conv(dbgi, node, mode);
4337                                 node          = do_strict_conv(dbgi, node);
4338                         }
4339                         in[0] = node;
4340                 } else {
4341                         ir_mode *mode;
4342                         if (is_compound_type(res_type)) {
4343                                 mode = mode_P_data;
4344                         } else {
4345                                 mode = get_type_mode(res_type);
4346                         }
4347                         in[0] = new_Unknown(mode);
4348                 }
4349                 in_len = 1;
4350         } else {
4351                 /* build return_value for its side effects */
4352                 if (statement->value != NULL) {
4353                         expression_to_firm(statement->value);
4354                 }
4355                 in_len = 0;
4356         }
4357
4358         ir_node  *store = get_store();
4359         ir_node  *ret   = new_d_Return(dbgi, store, in_len, in);
4360
4361         ir_node *end_block = get_irg_end_block(current_ir_graph);
4362         add_immBlock_pred(end_block, ret);
4363
4364         set_cur_block(NULL);
4365 }
4366
4367 static ir_node *expression_statement_to_firm(expression_statement_t *statement)
4368 {
4369         if (get_cur_block() == NULL)
4370                 return NULL;
4371
4372         return expression_to_firm(statement->expression);
4373 }
4374
4375 static ir_node *compound_statement_to_firm(compound_statement_t *compound)
4376 {
4377         entity_t *entity = compound->scope.entities;
4378         for ( ; entity != NULL; entity = entity->base.next) {
4379                 if (!is_declaration(entity))
4380                         continue;
4381
4382                 create_local_declaration(entity);
4383         }
4384
4385         ir_node     *result    = NULL;
4386         statement_t *statement = compound->statements;
4387         for ( ; statement != NULL; statement = statement->base.next) {
4388                 if (statement->base.next == NULL
4389                                 && statement->kind == STATEMENT_EXPRESSION) {
4390                         result = expression_statement_to_firm(
4391                                         &statement->expression);
4392                         break;
4393                 }
4394                 statement_to_firm(statement);
4395         }
4396
4397         return result;
4398 }
4399
4400 static void create_global_variable(entity_t *entity)
4401 {
4402         assert(entity->kind == ENTITY_VARIABLE);
4403
4404         ir_visibility vis;
4405         switch ((storage_class_tag_t)entity->declaration.storage_class) {
4406                 case STORAGE_CLASS_STATIC: vis = visibility_local;              break;
4407                 case STORAGE_CLASS_EXTERN: vis = visibility_external_allocated; break;
4408                 case STORAGE_CLASS_NONE:   vis = visibility_external_visible;   break;
4409
4410                 default: panic("Invalid storage class for global variable");
4411         }
4412
4413         ir_type *var_type = entity->variable.thread_local ?
4414                 get_tls_type() : get_glob_type();
4415         create_variable_entity(entity,
4416                         DECLARATION_KIND_GLOBAL_VARIABLE, var_type);
4417         set_entity_visibility(entity->variable.v.entity, vis);
4418 }
4419
4420 static void create_local_declaration(entity_t *entity)
4421 {
4422         assert(is_declaration(entity));
4423
4424         /* construct type */
4425         (void) get_ir_type(entity->declaration.type);
4426         if (entity->base.symbol == NULL) {
4427                 return;
4428         }
4429
4430         switch ((storage_class_tag_t) entity->declaration.storage_class) {
4431         case STORAGE_CLASS_STATIC:
4432                 create_local_static_variable(entity);
4433                 return;
4434         case STORAGE_CLASS_EXTERN:
4435                 if (entity->kind == ENTITY_FUNCTION) {
4436                         assert(entity->function.statement == NULL);
4437                         get_function_entity(entity);
4438                 } else {
4439                         create_global_variable(entity);
4440                         create_variable_initializer(entity);
4441                 }
4442                 return;
4443         case STORAGE_CLASS_NONE:
4444         case STORAGE_CLASS_AUTO:
4445         case STORAGE_CLASS_REGISTER:
4446                 if (entity->kind == ENTITY_FUNCTION) {
4447                         if (entity->function.statement != NULL) {
4448                                 get_function_entity(entity);
4449                                 entity->declaration.kind = DECLARATION_KIND_INNER_FUNCTION;
4450                                 enqueue_inner_function(entity);
4451                         } else {
4452                                 get_function_entity(entity);
4453                         }
4454                 } else {
4455                         create_local_variable(entity);
4456                 }
4457                 return;
4458         case STORAGE_CLASS_TYPEDEF:
4459                 break;
4460         }
4461         panic("invalid storage class found");
4462 }
4463
4464 static void initialize_local_declaration(entity_t *entity)
4465 {
4466         if (entity->base.symbol == NULL)
4467                 return;
4468
4469         switch ((declaration_kind_t) entity->declaration.kind) {
4470         case DECLARATION_KIND_LOCAL_VARIABLE:
4471         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY:
4472                 create_variable_initializer(entity);
4473                 return;
4474
4475         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
4476                 allocate_variable_length_array(entity);
4477                 return;
4478
4479         case DECLARATION_KIND_COMPOUND_MEMBER:
4480         case DECLARATION_KIND_GLOBAL_VARIABLE:
4481         case DECLARATION_KIND_FUNCTION:
4482         case DECLARATION_KIND_INNER_FUNCTION:
4483                 return;
4484
4485         case DECLARATION_KIND_PARAMETER:
4486         case DECLARATION_KIND_PARAMETER_ENTITY:
4487                 panic("can't initialize parameters");
4488
4489         case DECLARATION_KIND_UNKNOWN:
4490                 panic("can't initialize unknown declaration");
4491         }
4492         panic("invalid declaration kind");
4493 }
4494
4495 static void declaration_statement_to_firm(declaration_statement_t *statement)
4496 {
4497         entity_t *entity = statement->declarations_begin;
4498         if (entity == NULL)
4499                 return;
4500
4501         entity_t *const last = statement->declarations_end;
4502         for ( ;; entity = entity->base.next) {
4503                 if (is_declaration(entity)) {
4504                         initialize_local_declaration(entity);
4505                 } else if (entity->kind == ENTITY_TYPEDEF) {
4506                         type_t *const type = skip_typeref(entity->typedefe.type);
4507                         if (is_type_array(type) && type->array.is_vla)
4508                                 get_vla_size(&type->array);
4509                 }
4510                 if (entity == last)
4511                         break;
4512         }
4513 }
4514
4515 static void if_statement_to_firm(if_statement_t *statement)
4516 {
4517         ir_node *cur_block = get_cur_block();
4518
4519         ir_node *fallthrough_block = NULL;
4520
4521         /* the true (blocks) */
4522         ir_node *true_block = NULL;
4523         if (statement->true_statement != NULL) {
4524                 true_block = new_immBlock();
4525                 set_cur_block(true_block);
4526                 statement_to_firm(statement->true_statement);
4527                 if (get_cur_block() != NULL) {
4528                         ir_node *jmp = new_Jmp();
4529                         if (fallthrough_block == NULL)
4530                                 fallthrough_block = new_immBlock();
4531                         add_immBlock_pred(fallthrough_block, jmp);
4532                 }
4533         }
4534
4535         /* the false (blocks) */
4536         ir_node *false_block = NULL;
4537         if (statement->false_statement != NULL) {
4538                 false_block = new_immBlock();
4539                 set_cur_block(false_block);
4540
4541                 statement_to_firm(statement->false_statement);
4542                 if (get_cur_block() != NULL) {
4543                         ir_node *jmp = new_Jmp();
4544                         if (fallthrough_block == NULL)
4545                                 fallthrough_block = new_immBlock();
4546                         add_immBlock_pred(fallthrough_block, jmp);
4547                 }
4548         }
4549
4550         /* create the condition */
4551         if (cur_block != NULL) {
4552                 if (true_block == NULL || false_block == NULL) {
4553                         if (fallthrough_block == NULL)
4554                                 fallthrough_block = new_immBlock();
4555                         if (true_block == NULL)
4556                                 true_block = fallthrough_block;
4557                         if (false_block == NULL)
4558                                 false_block = fallthrough_block;
4559                 }
4560
4561                 set_cur_block(cur_block);
4562                 create_condition_evaluation(statement->condition, true_block,
4563                                             false_block);
4564         }
4565
4566         mature_immBlock(true_block);
4567         if (false_block != fallthrough_block && false_block != NULL) {
4568                 mature_immBlock(false_block);
4569         }
4570         if (fallthrough_block != NULL) {
4571                 mature_immBlock(fallthrough_block);
4572         }
4573
4574         set_cur_block(fallthrough_block);
4575 }
4576
4577 static void while_statement_to_firm(while_statement_t *statement)
4578 {
4579         ir_node *jmp = NULL;
4580         if (get_cur_block() != NULL) {
4581                 jmp = new_Jmp();
4582         }
4583
4584         /* create the header block */
4585         ir_node *header_block = new_immBlock();
4586         if (jmp != NULL) {
4587                 add_immBlock_pred(header_block, jmp);
4588         }
4589
4590         /* the loop body */
4591         ir_node *old_continue_label = continue_label;
4592         ir_node *old_break_label    = break_label;
4593         continue_label              = header_block;
4594         break_label                 = NULL;
4595
4596         ir_node *body_block = new_immBlock();
4597         set_cur_block(body_block);
4598         statement_to_firm(statement->body);
4599         ir_node *false_block = break_label;
4600
4601         assert(continue_label == header_block);
4602         continue_label = old_continue_label;
4603         break_label    = old_break_label;
4604
4605         if (get_cur_block() != NULL) {
4606                 jmp = new_Jmp();
4607                 add_immBlock_pred(header_block, jmp);
4608         }
4609
4610         /* shortcut for while(true) */
4611         if (is_constant_expression(statement->condition)
4612                         && fold_constant(statement->condition) != 0) {
4613                 set_cur_block(header_block);
4614                 ir_node *header_jmp = new_Jmp();
4615                 add_immBlock_pred(body_block, header_jmp);
4616
4617                 keep_alive(body_block);
4618                 keep_all_memory(body_block);
4619                 set_cur_block(body_block);
4620         } else {
4621                 if (false_block == NULL) {
4622                         false_block = new_immBlock();
4623                 }
4624
4625                 /* create the condition */
4626                 set_cur_block(header_block);
4627
4628                 create_condition_evaluation(statement->condition, body_block,
4629                                             false_block);
4630         }
4631
4632         mature_immBlock(body_block);
4633         mature_immBlock(header_block);
4634         if (false_block != NULL) {
4635                 mature_immBlock(false_block);
4636         }
4637
4638         set_cur_block(false_block);
4639 }
4640
4641 static void do_while_statement_to_firm(do_while_statement_t *statement)
4642 {
4643         ir_node *jmp = NULL;
4644         if (get_cur_block() != NULL) {
4645                 jmp = new_Jmp();
4646         }
4647
4648         /* create the header block */
4649         ir_node *header_block = new_immBlock();
4650
4651         /* the loop body */
4652         ir_node *body_block = new_immBlock();
4653         if (jmp != NULL) {
4654                 add_immBlock_pred(body_block, jmp);
4655         }
4656
4657         ir_node *old_continue_label = continue_label;
4658         ir_node *old_break_label    = break_label;
4659         continue_label              = header_block;
4660         break_label                 = NULL;
4661
4662         set_cur_block(body_block);
4663         statement_to_firm(statement->body);
4664         ir_node *false_block = break_label;
4665
4666         assert(continue_label == header_block);
4667         continue_label = old_continue_label;
4668         break_label    = old_break_label;
4669
4670         if (get_cur_block() != NULL) {
4671                 ir_node *body_jmp = new_Jmp();
4672                 add_immBlock_pred(header_block, body_jmp);
4673                 mature_immBlock(header_block);
4674         }
4675
4676         if (false_block == NULL) {
4677                 false_block = new_immBlock();
4678         }
4679
4680         /* create the condition */
4681         set_cur_block(header_block);
4682
4683         create_condition_evaluation(statement->condition, body_block, false_block);
4684         mature_immBlock(body_block);
4685         mature_immBlock(header_block);
4686         mature_immBlock(false_block);
4687
4688         set_cur_block(false_block);
4689 }
4690
4691 static void for_statement_to_firm(for_statement_t *statement)
4692 {
4693         ir_node *jmp = NULL;
4694
4695         /* create declarations */
4696         entity_t *entity = statement->scope.entities;
4697         for ( ; entity != NULL; entity = entity->base.next) {
4698                 if (!is_declaration(entity))
4699                         continue;
4700
4701                 create_local_declaration(entity);
4702         }
4703
4704         if (get_cur_block() != NULL) {
4705                 entity = statement->scope.entities;
4706                 for ( ; entity != NULL; entity = entity->base.next) {
4707                         if (!is_declaration(entity))
4708                                 continue;
4709
4710                         initialize_local_declaration(entity);
4711                 }
4712
4713                 if (statement->initialisation != NULL) {
4714                         expression_to_firm(statement->initialisation);
4715                 }
4716
4717                 jmp = new_Jmp();
4718         }
4719
4720
4721         /* create the step block */
4722         ir_node *const step_block = new_immBlock();
4723         set_cur_block(step_block);
4724         if (statement->step != NULL) {
4725                 expression_to_firm(statement->step);
4726         }
4727         ir_node *const step_jmp = new_Jmp();
4728
4729         /* create the header block */
4730         ir_node *const header_block = new_immBlock();
4731         set_cur_block(header_block);
4732         if (jmp != NULL) {
4733                 add_immBlock_pred(header_block, jmp);
4734         }
4735         add_immBlock_pred(header_block, step_jmp);
4736
4737         /* the false block */
4738         ir_node *const false_block = new_immBlock();
4739
4740         /* the loop body */
4741         ir_node *body_block;
4742         if (statement->body != NULL) {
4743                 ir_node *const old_continue_label = continue_label;
4744                 ir_node *const old_break_label    = break_label;
4745                 continue_label = step_block;
4746                 break_label    = false_block;
4747
4748                 body_block = new_immBlock();
4749                 set_cur_block(body_block);
4750                 statement_to_firm(statement->body);
4751
4752                 assert(continue_label == step_block);
4753                 assert(break_label    == false_block);
4754                 continue_label = old_continue_label;
4755                 break_label    = old_break_label;
4756
4757                 if (get_cur_block() != NULL) {
4758                         jmp = new_Jmp();
4759                         add_immBlock_pred(step_block, jmp);
4760                 }
4761         } else {
4762                 body_block = step_block;
4763         }
4764
4765         /* create the condition */
4766         set_cur_block(header_block);
4767         if (statement->condition != NULL) {
4768                 create_condition_evaluation(statement->condition, body_block,
4769                                             false_block);
4770         } else {
4771                 keep_alive(header_block);
4772                 keep_all_memory(header_block);
4773                 jmp = new_Jmp();
4774                 add_immBlock_pred(body_block, jmp);
4775         }
4776
4777         mature_immBlock(body_block);
4778         mature_immBlock(false_block);
4779         mature_immBlock(step_block);
4780         mature_immBlock(header_block);
4781         mature_immBlock(false_block);
4782
4783         set_cur_block(false_block);
4784 }
4785
4786 static void create_jump_statement(const statement_t *statement,
4787                                   ir_node *target_block)
4788 {
4789         if (get_cur_block() == NULL)
4790                 return;
4791
4792         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
4793         ir_node  *jump = new_d_Jmp(dbgi);
4794         add_immBlock_pred(target_block, jump);
4795
4796         set_cur_block(NULL);
4797 }
4798
4799 static ir_node *get_break_label(void)
4800 {
4801         if (break_label == NULL) {
4802                 break_label = new_immBlock();
4803         }
4804         return break_label;
4805 }
4806
4807 static void switch_statement_to_firm(switch_statement_t *statement)
4808 {
4809         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
4810
4811         ir_node *expression  = expression_to_firm(statement->expression);
4812         ir_node *cond        = new_d_Cond(dbgi, expression);
4813
4814         set_cur_block(NULL);
4815
4816         ir_node *const old_switch_cond       = current_switch_cond;
4817         ir_node *const old_break_label       = break_label;
4818         const bool     old_saw_default_label = saw_default_label;
4819         saw_default_label                    = false;
4820         current_switch_cond                  = cond;
4821         break_label                          = NULL;
4822         switch_statement_t *const old_switch = current_switch;
4823         current_switch                       = statement;
4824
4825         /* determine a free number for the default label */
4826         unsigned long num_cases = 0;
4827         long def_nr = 0;
4828         for (case_label_statement_t *l = statement->first_case; l != NULL; l = l->next) {
4829                 if (l->expression == NULL) {
4830                         /* default case */
4831                         continue;
4832                 }
4833                 if (l->last_case >= l->first_case)
4834                         num_cases += l->last_case - l->first_case + 1;
4835                 if (l->last_case > def_nr)
4836                         def_nr = l->last_case;
4837         }
4838
4839         if (def_nr == INT_MAX) {
4840                 /* Bad: an overflow will occurr, we cannot be sure that the
4841                  * maximum + 1 is a free number. Scan the values a second
4842                  * time to find a free number.
4843                  */
4844                 unsigned char *bits = xmalloc((num_cases + 7) >> 3);
4845
4846                 memset(bits, 0, (num_cases + 7) >> 3);
4847                 for (case_label_statement_t *l = statement->first_case; l != NULL; l = l->next) {
4848                         if (l->expression == NULL) {
4849                                 /* default case */
4850                                 continue;
4851                         }
4852                         unsigned long start = l->first_case > 0 ? (unsigned long)l->first_case : 0;
4853                         if (start < num_cases && l->last_case >= 0) {
4854                                 unsigned long end  = (unsigned long)l->last_case < num_cases ?
4855                                         (unsigned long)l->last_case : num_cases - 1;
4856                                 for (unsigned long cns = start; cns <= end; ++cns) {
4857                                         bits[cns >> 3] |= (1 << (cns & 7));
4858                                 }
4859                         }
4860                 }
4861                 /* We look at the first num_cases constants:
4862                  * Either they are densed, so we took the last (num_cases)
4863                  * one, or they are non densed, so we will find one free
4864                  * there...
4865                  */
4866                 unsigned long i;
4867                 for (i = 0; i < num_cases; ++i)
4868                         if ((bits[i >> 3] & (1 << (i & 7))) == 0)
4869                                 break;
4870
4871                 free(bits);
4872                 def_nr = i;
4873         } else {
4874                 ++def_nr;
4875         }
4876         statement->default_proj_nr = def_nr;
4877
4878         if (statement->body != NULL) {
4879                 statement_to_firm(statement->body);
4880         }
4881
4882         if (get_cur_block() != NULL) {
4883                 ir_node *jmp = new_Jmp();
4884                 add_immBlock_pred(get_break_label(), jmp);
4885         }
4886
4887         if (!saw_default_label) {
4888                 set_cur_block(get_nodes_block(cond));
4889                 ir_node *const proj = new_d_defaultProj(dbgi, cond,
4890                                                         statement->default_proj_nr);
4891                 add_immBlock_pred(get_break_label(), proj);
4892         }
4893
4894         if (break_label != NULL) {
4895                 mature_immBlock(break_label);
4896         }
4897         set_cur_block(break_label);
4898
4899         assert(current_switch_cond == cond);
4900         current_switch      = old_switch;
4901         current_switch_cond = old_switch_cond;
4902         break_label         = old_break_label;
4903         saw_default_label   = old_saw_default_label;
4904 }
4905
4906 static void case_label_to_firm(const case_label_statement_t *statement)
4907 {
4908         if (statement->is_empty_range)
4909                 return;
4910
4911         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
4912
4913         ir_node *const fallthrough = (get_cur_block() == NULL ? NULL : new_Jmp());
4914
4915         ir_node *proj;
4916         ir_node *block     = new_immBlock();
4917
4918         set_cur_block(get_nodes_block(current_switch_cond));
4919         if (statement->expression != NULL) {
4920                 long pn     = statement->first_case;
4921                 long end_pn = statement->last_case;
4922                 assert(pn <= end_pn);
4923                 /* create jumps for all cases in the given range */
4924                 do {
4925                         proj = new_d_Proj(dbgi, current_switch_cond, mode_X, pn);
4926                         add_immBlock_pred(block, proj);
4927                 } while(pn++ < end_pn);
4928         } else {
4929                 saw_default_label = true;
4930                 proj = new_d_defaultProj(dbgi, current_switch_cond,
4931                                          current_switch->default_proj_nr);
4932
4933                 add_immBlock_pred(block, proj);
4934         }
4935
4936         if (fallthrough != NULL) {
4937                 add_immBlock_pred(block, fallthrough);
4938         }
4939         mature_immBlock(block);
4940         set_cur_block(block);
4941
4942         if (statement->statement != NULL) {
4943                 statement_to_firm(statement->statement);
4944         }
4945 }
4946
4947 static void label_to_firm(const label_statement_t *statement)
4948 {
4949         ir_node *block = get_label_block(statement->label);
4950
4951         if (get_cur_block() != NULL) {
4952                 ir_node *jmp = new_Jmp();
4953                 add_immBlock_pred(block, jmp);
4954         }
4955
4956         set_cur_block(block);
4957         keep_alive(block);
4958         keep_all_memory(block);
4959
4960         if (statement->statement != NULL) {
4961                 statement_to_firm(statement->statement);
4962         }
4963 }
4964
4965 static void goto_to_firm(const goto_statement_t *statement)
4966 {
4967         if (get_cur_block() == NULL)
4968                 return;
4969
4970         if (statement->expression) {
4971                 ir_node  *irn  = expression_to_firm(statement->expression);
4972                 dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
4973                 ir_node  *ijmp = new_d_IJmp(dbgi, irn);
4974
4975                 set_irn_link(ijmp, ijmp_list);
4976                 ijmp_list = ijmp;
4977         } else {
4978                 ir_node *block = get_label_block(statement->label);
4979                 ir_node *jmp   = new_Jmp();
4980                 add_immBlock_pred(block, jmp);
4981         }
4982         set_cur_block(NULL);
4983 }
4984
4985 static void asm_statement_to_firm(const asm_statement_t *statement)
4986 {
4987         bool needs_memory = false;
4988
4989         if (statement->is_volatile) {
4990                 needs_memory = true;
4991         }
4992
4993         size_t         n_clobbers = 0;
4994         asm_clobber_t *clobber    = statement->clobbers;
4995         for ( ; clobber != NULL; clobber = clobber->next) {
4996                 const char *clobber_str = clobber->clobber.begin;
4997
4998                 if (!be_is_valid_clobber(clobber_str)) {
4999                         errorf(&statement->base.source_position,
5000                                    "invalid clobber '%s' specified", clobber->clobber);
5001                         continue;
5002                 }
5003
5004                 if (strcmp(clobber_str, "memory") == 0) {
5005                         needs_memory = true;
5006                         continue;
5007                 }
5008
5009                 ident *id = new_id_from_str(clobber_str);
5010                 obstack_ptr_grow(&asm_obst, id);
5011                 ++n_clobbers;
5012         }
5013         assert(obstack_object_size(&asm_obst) == n_clobbers * sizeof(ident*));
5014         ident **clobbers = NULL;
5015         if (n_clobbers > 0) {
5016                 clobbers = obstack_finish(&asm_obst);
5017         }
5018
5019         size_t n_inputs  = 0;
5020         asm_argument_t *argument = statement->inputs;
5021         for ( ; argument != NULL; argument = argument->next)
5022                 n_inputs++;
5023         size_t n_outputs = 0;
5024         argument = statement->outputs;
5025         for ( ; argument != NULL; argument = argument->next)
5026                 n_outputs++;
5027
5028         unsigned next_pos = 0;
5029
5030         ir_node *ins[n_inputs + n_outputs + 1];
5031         size_t   in_size = 0;
5032
5033         ir_asm_constraint tmp_in_constraints[n_outputs];
5034
5035         const expression_t *out_exprs[n_outputs];
5036         ir_node            *out_addrs[n_outputs];
5037         size_t              out_size = 0;
5038
5039         argument = statement->outputs;
5040         for ( ; argument != NULL; argument = argument->next) {
5041                 const char *constraints = argument->constraints.begin;
5042                 asm_constraint_flags_t asm_flags
5043                         = be_parse_asm_constraints(constraints);
5044
5045                 if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
5046                         warningf(&statement->base.source_position,
5047                                "some constraints in '%s' are not supported", constraints);
5048                 }
5049                 if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
5050                         errorf(&statement->base.source_position,
5051                                "some constraints in '%s' are invalid", constraints);
5052                         continue;
5053                 }
5054                 if (! (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE)) {
5055                         errorf(&statement->base.source_position,
5056                                "no write flag specified for output constraints '%s'",
5057                                constraints);
5058                         continue;
5059                 }
5060
5061                 unsigned pos = next_pos++;
5062                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
5063                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
5064                         expression_t *expr = argument->expression;
5065                         ir_node      *addr = expression_to_addr(expr);
5066                         /* in+output, construct an artifical same_as constraint on the
5067                          * input */
5068                         if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_READ) {
5069                                 char     buf[64];
5070                                 ir_node *value = get_value_from_lvalue(expr, addr);
5071
5072                                 snprintf(buf, sizeof(buf), "%u", pos);
5073
5074                                 ir_asm_constraint constraint;
5075                                 constraint.pos              = pos;
5076                                 constraint.constraint       = new_id_from_str(buf);
5077                                 constraint.mode             = get_ir_mode_storage(expr->base.type);
5078                                 tmp_in_constraints[in_size] = constraint;
5079                                 ins[in_size] = value;
5080
5081                                 ++in_size;
5082                         }
5083
5084                         out_exprs[out_size] = expr;
5085                         out_addrs[out_size] = addr;
5086                         ++out_size;
5087                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
5088                         /* pure memory ops need no input (but we have to make sure we
5089                          * attach to the memory) */
5090                         assert(! (asm_flags &
5091                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
5092                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
5093                         needs_memory = true;
5094
5095                         /* we need to attach the address to the inputs */
5096                         expression_t *expr = argument->expression;
5097
5098                         ir_asm_constraint constraint;
5099                         constraint.pos              = pos;
5100                         constraint.constraint       = new_id_from_str(constraints);
5101                         constraint.mode             = NULL;
5102                         tmp_in_constraints[in_size] = constraint;
5103
5104                         ins[in_size]          = expression_to_addr(expr);
5105                         ++in_size;
5106                         continue;
5107                 } else {
5108                         errorf(&statement->base.source_position,
5109                                "only modifiers but no place set in constraints '%s'",
5110                                constraints);
5111                         continue;
5112                 }
5113
5114                 ir_asm_constraint constraint;
5115                 constraint.pos        = pos;
5116                 constraint.constraint = new_id_from_str(constraints);
5117                 constraint.mode       = get_ir_mode_storage(argument->expression->base.type);
5118
5119                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5120         }
5121         assert(obstack_object_size(&asm_obst)
5122                         == out_size * sizeof(ir_asm_constraint));
5123         ir_asm_constraint *output_constraints = obstack_finish(&asm_obst);
5124
5125
5126         obstack_grow(&asm_obst, tmp_in_constraints,
5127                      in_size * sizeof(tmp_in_constraints[0]));
5128         /* find and count input and output arguments */
5129         argument = statement->inputs;
5130         for ( ; argument != NULL; argument = argument->next) {
5131                 const char *constraints = argument->constraints.begin;
5132                 asm_constraint_flags_t asm_flags
5133                         = be_parse_asm_constraints(constraints);
5134
5135                 if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
5136                         errorf(&statement->base.source_position,
5137                                "some constraints in '%s' are not supported", constraints);
5138                         continue;
5139                 }
5140                 if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
5141                         errorf(&statement->base.source_position,
5142                                "some constraints in '%s' are invalid", constraints);
5143                         continue;
5144                 }
5145                 if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE) {
5146                         errorf(&statement->base.source_position,
5147                                "write flag specified for input constraints '%s'",
5148                                constraints);
5149                         continue;
5150                 }
5151
5152                 ir_node *input;
5153                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
5154                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
5155                         /* we can treat this as "normal" input */
5156                         input = expression_to_firm(argument->expression);
5157                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
5158                         /* pure memory ops need no input (but we have to make sure we
5159                          * attach to the memory) */
5160                         assert(! (asm_flags &
5161                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
5162                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
5163                         needs_memory = true;
5164                         input = expression_to_addr(argument->expression);
5165                 } else {
5166                         errorf(&statement->base.source_position,
5167                                "only modifiers but no place set in constraints '%s'",
5168                                constraints);
5169                         continue;
5170                 }
5171
5172                 ir_asm_constraint constraint;
5173                 constraint.pos        = next_pos++;
5174                 constraint.constraint = new_id_from_str(constraints);
5175                 constraint.mode       = get_irn_mode(input);
5176
5177                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5178                 ins[in_size++] = input;
5179         }
5180
5181         if (needs_memory) {
5182                 ir_asm_constraint constraint;
5183                 constraint.pos        = next_pos++;
5184                 constraint.constraint = new_id_from_str("");
5185                 constraint.mode       = mode_M;
5186
5187                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5188                 ins[in_size++] = get_store();
5189         }
5190
5191         assert(obstack_object_size(&asm_obst)
5192                         == in_size * sizeof(ir_asm_constraint));
5193         ir_asm_constraint *input_constraints = obstack_finish(&asm_obst);
5194
5195         /* create asm node */
5196         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
5197
5198         ident *asm_text = new_id_from_str(statement->asm_text.begin);
5199
5200         ir_node *node = new_d_ASM(dbgi, in_size, ins, input_constraints,
5201                                   out_size, output_constraints,
5202                                   n_clobbers, clobbers, asm_text);
5203
5204         if (statement->is_volatile) {
5205                 set_irn_pinned(node, op_pin_state_pinned);
5206         } else {
5207                 set_irn_pinned(node, op_pin_state_floats);
5208         }
5209
5210         /* create output projs & connect them */
5211         if (needs_memory) {
5212                 ir_node *projm = new_Proj(node, mode_M, out_size+1);
5213                 set_store(projm);
5214         }
5215
5216         size_t i;
5217         for (i = 0; i < out_size; ++i) {
5218                 const expression_t *out_expr = out_exprs[i];
5219                 long                pn       = i;
5220                 ir_mode            *mode     = get_ir_mode_storage(out_expr->base.type);
5221                 ir_node            *proj     = new_Proj(node, mode, pn);
5222                 ir_node            *addr     = out_addrs[i];
5223
5224                 set_value_for_expression_addr(out_expr, proj, addr);
5225         }
5226 }
5227
5228 static void     ms_try_statement_to_firm(ms_try_statement_t *statement)
5229 {
5230         statement_to_firm(statement->try_statement);
5231         warningf(&statement->base.source_position, "structured exception handling ignored");
5232 }
5233
5234 static void     leave_statement_to_firm(leave_statement_t *statement)
5235 {
5236         errorf(&statement->base.source_position, "__leave not supported yet");
5237 }
5238
5239 /**
5240  * Transform a statement.
5241  */
5242 static void statement_to_firm(statement_t *statement)
5243 {
5244 #ifndef NDEBUG
5245         assert(!statement->base.transformed);
5246         statement->base.transformed = true;
5247 #endif
5248
5249         switch (statement->kind) {
5250         case STATEMENT_INVALID:
5251                 panic("invalid statement found");
5252         case STATEMENT_EMPTY:
5253                 /* nothing */
5254                 return;
5255         case STATEMENT_COMPOUND:
5256                 compound_statement_to_firm(&statement->compound);
5257                 return;
5258         case STATEMENT_RETURN:
5259                 return_statement_to_firm(&statement->returns);
5260                 return;
5261         case STATEMENT_EXPRESSION:
5262                 expression_statement_to_firm(&statement->expression);
5263                 return;
5264         case STATEMENT_IF:
5265                 if_statement_to_firm(&statement->ifs);
5266                 return;
5267         case STATEMENT_WHILE:
5268                 while_statement_to_firm(&statement->whiles);
5269                 return;
5270         case STATEMENT_DO_WHILE:
5271                 do_while_statement_to_firm(&statement->do_while);
5272                 return;
5273         case STATEMENT_DECLARATION:
5274                 declaration_statement_to_firm(&statement->declaration);
5275                 return;
5276         case STATEMENT_BREAK:
5277                 create_jump_statement(statement, get_break_label());
5278                 return;
5279         case STATEMENT_CONTINUE:
5280                 create_jump_statement(statement, continue_label);
5281                 return;
5282         case STATEMENT_SWITCH:
5283                 switch_statement_to_firm(&statement->switchs);
5284                 return;
5285         case STATEMENT_CASE_LABEL:
5286                 case_label_to_firm(&statement->case_label);
5287                 return;
5288         case STATEMENT_FOR:
5289                 for_statement_to_firm(&statement->fors);
5290                 return;
5291         case STATEMENT_LABEL:
5292                 label_to_firm(&statement->label);
5293                 return;
5294         case STATEMENT_GOTO:
5295                 goto_to_firm(&statement->gotos);
5296                 return;
5297         case STATEMENT_ASM:
5298                 asm_statement_to_firm(&statement->asms);
5299                 return;
5300         case STATEMENT_MS_TRY:
5301                 ms_try_statement_to_firm(&statement->ms_try);
5302                 return;
5303         case STATEMENT_LEAVE:
5304                 leave_statement_to_firm(&statement->leave);
5305                 return;
5306         }
5307         panic("statement not implemented");
5308 }
5309
5310 static int count_local_variables(const entity_t *entity,
5311                                  const entity_t *const last)
5312 {
5313         int count = 0;
5314         entity_t const *const end = last != NULL ? last->base.next : NULL;
5315         for (; entity != end; entity = entity->base.next) {
5316                 type_t *type;
5317                 bool    address_taken;
5318
5319                 if (entity->kind == ENTITY_VARIABLE) {
5320                         type          = skip_typeref(entity->declaration.type);
5321                         address_taken = entity->variable.address_taken;
5322                 } else if (entity->kind == ENTITY_PARAMETER) {
5323                         type          = skip_typeref(entity->declaration.type);
5324                         address_taken = entity->parameter.address_taken;
5325                 } else {
5326                         continue;
5327                 }
5328
5329                 if (!address_taken && is_type_scalar(type))
5330                         ++count;
5331         }
5332         return count;
5333 }
5334
5335 static void count_local_variables_in_stmt(statement_t *stmt, void *const env)
5336 {
5337         int *const count = env;
5338
5339         switch (stmt->kind) {
5340         case STATEMENT_DECLARATION: {
5341                 const declaration_statement_t *const decl_stmt = &stmt->declaration;
5342                 *count += count_local_variables(decl_stmt->declarations_begin,
5343                                 decl_stmt->declarations_end);
5344                 break;
5345         }
5346
5347         case STATEMENT_FOR:
5348                 *count += count_local_variables(stmt->fors.scope.entities, NULL);
5349                 break;
5350
5351         default:
5352                 break;
5353         }
5354 }
5355
5356 static int get_function_n_local_vars(entity_t *entity)
5357 {
5358         int count = 0;
5359
5360         /* count parameters */
5361         count += count_local_variables(entity->function.parameters.entities, NULL);
5362
5363         /* count local variables declared in body */
5364         walk_statements(entity->function.statement, count_local_variables_in_stmt,
5365                         &count);
5366         return count;
5367 }
5368
5369 static void initialize_function_parameters(entity_t *entity)
5370 {
5371         assert(entity->kind == ENTITY_FUNCTION);
5372         ir_graph *irg             = current_ir_graph;
5373         ir_node  *args            = get_irg_args(irg);
5374         ir_node  *start_block     = get_irg_start_block(irg);
5375         ir_type  *function_irtype = get_ir_type(entity->declaration.type);
5376
5377         int       n         = 0;
5378         entity_t *parameter = entity->function.parameters.entities;
5379         for ( ; parameter != NULL; parameter = parameter->base.next, ++n) {
5380                 if (parameter->kind != ENTITY_PARAMETER)
5381                         continue;
5382
5383                 assert(parameter->declaration.kind == DECLARATION_KIND_UNKNOWN);
5384                 type_t *type = skip_typeref(parameter->declaration.type);
5385
5386                 bool needs_entity = parameter->parameter.address_taken;
5387                 assert(!is_type_array(type));
5388                 if (is_type_compound(type)) {
5389                         needs_entity = true;
5390                 }
5391
5392                 if (needs_entity) {
5393                         ir_entity *entity = get_method_value_param_ent(function_irtype, n);
5394                         ident     *id     = new_id_from_str(parameter->base.symbol->string);
5395                         set_entity_ident(entity, id);
5396
5397                         parameter->declaration.kind
5398                                 = DECLARATION_KIND_PARAMETER_ENTITY;
5399                         parameter->parameter.v.entity = entity;
5400                         continue;
5401                 }
5402
5403                 ir_type *param_irtype = get_method_param_type(function_irtype, n);
5404                 ir_mode *param_mode   = get_type_mode(param_irtype);
5405
5406                 long     pn    = n;
5407                 ir_node *value = new_r_Proj(irg, start_block, args, param_mode, pn);
5408
5409                 ir_mode *mode = get_ir_mode_storage(type);
5410                 value = create_conv(NULL, value, mode);
5411                 value = do_strict_conv(NULL, value);
5412
5413                 parameter->declaration.kind         = DECLARATION_KIND_PARAMETER;
5414                 parameter->parameter.v.value_number = next_value_number_function;
5415                 set_irg_loc_description(current_ir_graph, next_value_number_function,
5416                                         parameter);
5417                 ++next_value_number_function;
5418
5419                 set_value(parameter->parameter.v.value_number, value);
5420         }
5421 }
5422
5423 /**
5424  * Handle additional decl modifiers for IR-graphs
5425  *
5426  * @param irg            the IR-graph
5427  * @param dec_modifiers  additional modifiers
5428  */
5429 static void handle_decl_modifier_irg(ir_graph_ptr irg, decl_modifiers_t decl_modifiers)
5430 {
5431         if (decl_modifiers & DM_RETURNS_TWICE) {
5432                 /* TRUE if the declaration includes __attribute__((returns_twice)) */
5433                 set_irg_additional_property(irg, mtp_property_returns_twice);
5434         }
5435         if (decl_modifiers & DM_NORETURN) {
5436                 /* TRUE if the declaration includes the Microsoft
5437                    __declspec(noreturn) specifier. */
5438                 set_irg_additional_property(irg, mtp_property_noreturn);
5439         }
5440         if (decl_modifiers & DM_NOTHROW) {
5441                 /* TRUE if the declaration includes the Microsoft
5442                    __declspec(nothrow) specifier. */
5443                 set_irg_additional_property(irg, mtp_property_nothrow);
5444         }
5445         if (decl_modifiers & DM_NAKED) {
5446                 /* TRUE if the declaration includes the Microsoft
5447                    __declspec(naked) specifier. */
5448                 set_irg_additional_property(irg, mtp_property_naked);
5449         }
5450         if (decl_modifiers & DM_FORCEINLINE) {
5451                 /* TRUE if the declaration includes the
5452                    Microsoft __forceinline specifier. */
5453                 set_irg_inline_property(irg, irg_inline_forced);
5454         }
5455         if (decl_modifiers & DM_NOINLINE) {
5456                 /* TRUE if the declaration includes the Microsoft
5457                    __declspec(noinline) specifier. */
5458                 set_irg_inline_property(irg, irg_inline_forbidden);
5459         }
5460 }
5461
5462 static void add_function_pointer(ir_type *segment, ir_entity *method,
5463                                  const char *unique_template)
5464 {
5465         ir_type   *method_type  = get_entity_type(method);
5466         ident     *id           = id_unique(unique_template);
5467         ir_type   *ptr_type     = new_type_pointer(id, method_type, mode_P_code);
5468
5469         ident     *ide          = id_unique(unique_template);
5470         ir_entity *ptr          = new_entity(segment, ide, ptr_type);
5471         ir_graph  *irg          = get_const_code_irg();
5472         ir_node   *val          = new_rd_SymConst_addr_ent(NULL, irg, mode_P_code,
5473                                                            method, NULL);
5474
5475         set_entity_compiler_generated(ptr, 1);
5476         set_entity_variability(ptr, variability_constant);
5477         set_atomic_ent_value(ptr, val);
5478 }
5479
5480 /**
5481  * Generate possible IJmp branches to a given label block.
5482  */
5483 static void gen_ijmp_branches(ir_node *block)
5484 {
5485         ir_node *ijmp;
5486         for (ijmp = ijmp_list; ijmp != NULL; ijmp = get_irn_link(ijmp)) {
5487                 add_immBlock_pred(block, ijmp);
5488         }
5489 }
5490
5491 /**
5492  * Create code for a function.
5493  */
5494 static void create_function(entity_t *entity)
5495 {
5496         assert(entity->kind == ENTITY_FUNCTION);
5497         ir_entity *function_entity = get_function_entity(entity);
5498
5499         if (entity->function.statement == NULL)
5500                 return;
5501
5502         if (entity->declaration.modifiers & DM_CONSTRUCTOR) {
5503                 ir_type *segment = get_segment_type(IR_SEGMENT_CONSTRUCTORS);
5504                 add_function_pointer(segment, function_entity, "constructor_ptr.%u");
5505         }
5506         if (entity->declaration.modifiers & DM_DESTRUCTOR) {
5507                 ir_type *segment = get_segment_type(IR_SEGMENT_DESTRUCTORS);
5508                 add_function_pointer(segment, function_entity, "destructor_ptr.%u");
5509         }
5510
5511         current_function_entity = entity;
5512         current_function_name   = NULL;
5513         current_funcsig         = NULL;
5514
5515         assert(all_labels == NULL);
5516         all_labels = NEW_ARR_F(label_t *, 0);
5517         ijmp_list  = NULL;
5518
5519         int       n_local_vars = get_function_n_local_vars(entity);
5520         ir_graph *irg          = new_ir_graph(function_entity, n_local_vars);
5521
5522         ir_graph *old_current_function = current_function;
5523         current_function = irg;
5524
5525         set_irg_fp_model(irg, firm_opt.fp_model);
5526         tarval_enable_fp_ops(1);
5527         set_irn_dbg_info(get_irg_start_block(irg), get_entity_dbg_info(function_entity));
5528
5529         ir_node *first_block = get_cur_block();
5530
5531         /* set inline flags */
5532         if (entity->function.is_inline)
5533                 set_irg_inline_property(irg, irg_inline_recomended);
5534         handle_decl_modifier_irg(irg, entity->declaration.modifiers);
5535
5536         next_value_number_function = 0;
5537         initialize_function_parameters(entity);
5538
5539         statement_to_firm(entity->function.statement);
5540
5541         ir_node *end_block = get_irg_end_block(irg);
5542
5543         /* do we have a return statement yet? */
5544         if (get_cur_block() != NULL) {
5545                 type_t *type = skip_typeref(entity->declaration.type);
5546                 assert(is_type_function(type));
5547                 const function_type_t *func_type   = &type->function;
5548                 const type_t          *return_type
5549                         = skip_typeref(func_type->return_type);
5550
5551                 ir_node *ret;
5552                 if (is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
5553                         ret = new_Return(get_store(), 0, NULL);
5554                 } else {
5555                         ir_mode *mode;
5556                         if (is_type_scalar(return_type)) {
5557                                 mode = get_ir_mode_storage(func_type->return_type);
5558                         } else {
5559                                 mode = mode_P_data;
5560                         }
5561
5562                         ir_node *in[1];
5563                         /* §5.1.2.2.3 main implicitly returns 0 */
5564                         if (is_main(entity)) {
5565                                 in[0] = new_Const(get_mode_null(mode));
5566                         } else {
5567                                 in[0] = new_Unknown(mode);
5568                         }
5569                         ret = new_Return(get_store(), 1, in);
5570                 }
5571                 add_immBlock_pred(end_block, ret);
5572         }
5573
5574         bool has_computed_gotos = false;
5575         for (int i = ARR_LEN(all_labels) - 1; i >= 0; --i) {
5576                 label_t *label = all_labels[i];
5577                 if (label->address_taken) {
5578                         gen_ijmp_branches(label->block);
5579                         has_computed_gotos = true;
5580                 }
5581                 mature_immBlock(label->block);
5582         }
5583         if (has_computed_gotos) {
5584                 /* if we have computed goto's in the function, we cannot inline it */
5585                 if (get_irg_inline_property(irg) >= irg_inline_recomended) {
5586                         warningf(&entity->base.source_position,
5587                                  "function '%Y' can never be inlined because it contains a computed goto",
5588                                  entity->base.symbol);
5589                 }
5590                 set_irg_inline_property(irg, irg_inline_forbidden);
5591         }
5592
5593         DEL_ARR_F(all_labels);
5594         all_labels = NULL;
5595
5596         mature_immBlock(first_block);
5597         mature_immBlock(end_block);
5598
5599         irg_finalize_cons(irg);
5600
5601         /* finalize the frame type */
5602         ir_type *frame_type = get_irg_frame_type(irg);
5603         int      n          = get_compound_n_members(frame_type);
5604         int      align_all  = 4;
5605         int      offset     = 0;
5606         for (int i = 0; i < n; ++i) {
5607                 ir_entity *entity      = get_compound_member(frame_type, i);
5608                 ir_type   *entity_type = get_entity_type(entity);
5609
5610                 int align = get_type_alignment_bytes(entity_type);
5611                 if (align > align_all)
5612                         align_all = align;
5613                 int misalign = 0;
5614                 if (align > 0) {
5615                         misalign  = offset % align;
5616                         if (misalign > 0) {
5617                                 offset += align - misalign;
5618                         }
5619                 }
5620
5621                 set_entity_offset(entity, offset);
5622                 offset += get_type_size_bytes(entity_type);
5623         }
5624         set_type_size_bytes(frame_type, offset);
5625         set_type_alignment_bytes(frame_type, align_all);
5626
5627         irg_vrfy(irg);
5628         current_function = old_current_function;
5629
5630         /* create inner functions */
5631         entity_t *inner;
5632         for (inner = next_inner_function(); inner != NULL;
5633              inner = next_inner_function()) {
5634                 create_function(inner);
5635         }
5636 }
5637
5638 static void scope_to_firm(scope_t *scope)
5639 {
5640         /* first pass: create declarations */
5641         entity_t *entity = scope->entities;
5642         for ( ; entity != NULL; entity = entity->base.next) {
5643                 if (entity->base.symbol == NULL)
5644                         continue;
5645
5646                 if (entity->kind == ENTITY_FUNCTION) {
5647                         get_function_entity(entity);
5648                 } else if (entity->kind == ENTITY_VARIABLE) {
5649                         create_global_variable(entity);
5650                 }
5651         }
5652
5653         /* second pass: create code/initializers */
5654         entity = scope->entities;
5655         for ( ; entity != NULL; entity = entity->base.next) {
5656                 if (entity->base.symbol == NULL)
5657                         continue;
5658
5659                 if (entity->kind == ENTITY_FUNCTION) {
5660                         create_function(entity);
5661                 } else if (entity->kind == ENTITY_VARIABLE) {
5662                         assert(entity->declaration.kind
5663                                         == DECLARATION_KIND_GLOBAL_VARIABLE);
5664                         current_ir_graph = get_const_code_irg();
5665                         create_variable_initializer(entity);
5666                 }
5667         }
5668 }
5669
5670 void init_ast2firm(void)
5671 {
5672         obstack_init(&asm_obst);
5673         init_atomic_modes();
5674
5675         /* OS option must be set to the backend */
5676         switch (firm_opt.os_support) {
5677         case OS_SUPPORT_MINGW:
5678                 create_ld_ident = create_name_win32;
5679                 break;
5680         case OS_SUPPORT_LINUX:
5681                 create_ld_ident = create_name_linux_elf;
5682                 break;
5683         case OS_SUPPORT_MACHO:
5684                 create_ld_ident = create_name_macho;
5685                 break;
5686         default:
5687                 panic("unexpected OS support mode");
5688         }
5689
5690         /* create idents for all known runtime functions */
5691         for (size_t i = 0; i < lengthof(rts_data); ++i) {
5692                 rts_idents[i] = new_id_from_str(rts_data[i].name);
5693         }
5694
5695         entitymap_init(&entitymap);
5696 }
5697
5698 static void init_ir_types(void)
5699 {
5700         static int ir_types_initialized = 0;
5701         if (ir_types_initialized)
5702                 return;
5703         ir_types_initialized = 1;
5704
5705         ir_type_int        = get_ir_type(type_int);
5706         ir_type_const_char = get_ir_type(type_const_char);
5707         ir_type_wchar_t    = get_ir_type(type_wchar_t);
5708         ir_type_void       = get_ir_type(type_void);
5709
5710         const backend_params *be_params = be_get_backend_param();
5711         mode_float_arithmetic = be_params->mode_float_arithmetic;
5712 }
5713
5714 void exit_ast2firm(void)
5715 {
5716         entitymap_destroy(&entitymap);
5717         obstack_free(&asm_obst, NULL);
5718 }
5719
5720 static void global_asm_to_firm(statement_t *s)
5721 {
5722         for (; s != NULL; s = s->base.next) {
5723                 assert(s->kind == STATEMENT_ASM);
5724
5725                 char const *const text = s->asms.asm_text.begin;
5726                 size_t            size = s->asms.asm_text.size;
5727
5728                 /* skip the last \0 */
5729                 if (text[size - 1] == '\0')
5730                         --size;
5731
5732                 ident *const id = new_id_from_chars(text, size);
5733                 add_irp_asm(id);
5734         }
5735 }
5736
5737 void translation_unit_to_firm(translation_unit_t *unit)
5738 {
5739         /* just to be sure */
5740         continue_label           = NULL;
5741         break_label              = NULL;
5742         current_switch_cond      = NULL;
5743         current_translation_unit = unit;
5744
5745         init_ir_types();
5746         inner_functions = NEW_ARR_F(entity_t *, 0);
5747
5748         scope_to_firm(&unit->scope);
5749         global_asm_to_firm(unit->global_asm);
5750
5751         DEL_ARR_F(inner_functions);
5752         inner_functions  = NULL;
5753
5754         current_ir_graph         = NULL;
5755         current_translation_unit = NULL;
5756 }