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