nsz Git - cparser/blob - ast2firm.c

   1 /*
   2  * This file is part of cparser.
   3  * Copyright (C) 2007-2009 Matthias Braun <matze@braunis.de>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  18  * 02111-1307, USA.
  19  */
  20 #include <config.h>
  21
  22 #include <assert.h>
  23 #include <string.h>
  24 #include <stdbool.h>
  25 #include <limits.h>
  26
  27 #include <libfirm/firm.h>
  28 #include <libfirm/adt/obst.h>
  29 #include <libfirm/be.h>
  30
  31 #include "ast2firm.h"
  32
  33 #include "adt/error.h"
  34 #include "adt/array.h"
  35 #include "adt/strutil.h"
  36 #include "adt/util.h"
  37 #include "symbol_t.h"
  38 #include "token_t.h"
  39 #include "type_t.h"
  40 #include "ast_t.h"
  41 #include "entity_t.h"
  42 #include "parser.h"
  43 #include "diagnostic.h"
  44 #include "lang_features.h"
  45 #include "types.h"
  46 #include "type_hash.h"
  47 #include "mangle.h"
  48 #include "walk.h"
  49 #include "warning.h"
  50 #include "printer.h"
  51 #include "entitymap_t.h"
  52 #include "driver/firm_opt.h"
  53
  54 typedef struct trampoline_region trampoline_region;
  55 struct trampoline_region {
  56         ir_entity        *function;    /**< The function that is called by this trampoline */
  57         ir_entity        *region;      /**< created region for the trampoline */
  58 };
  59
  60 fp_model_t firm_fp_model = fp_model_precise;
  61
  62 static const backend_params *be_params;
  63
  64 static ir_type *ir_type_char;
  65 static ir_type *ir_type_const_char;
  66 static ir_type *ir_type_wchar_t;
  67
  68 /* architecture specific floating point arithmetic mode (if any) */
  69 static ir_mode *mode_float_arithmetic;
  70
  71 /* alignment of stack parameters */
  72 static unsigned stack_param_align;
  73
  74 static int        next_value_number_function;
  75 static ir_node   *continue_label;
  76 static ir_node   *break_label;
  77 static ir_node   *current_switch;
  78 static bool       saw_default_label;
  79 static label_t  **all_labels;
  80 static entity_t **inner_functions;
  81 static ir_node   *ijmp_list;
  82 static bool       constant_folding;
  83
  84 static const entity_t     *current_function_entity;
  85 static ir_node            *current_function_name;
  86 static ir_node            *current_funcsig;
  87 static ir_graph           *current_function;
  88 static translation_unit_t *current_translation_unit;
  89 static trampoline_region  *current_trampolines;
  90 static ir_type            *current_outer_frame;
  91 static ir_node            *current_static_link;
  92 static ir_entity          *current_vararg_entity;
  93
  94 static entitymap_t  entitymap;
  95
  96 static struct obstack asm_obst;
  97
  98 typedef enum declaration_kind_t {
  99         DECLARATION_KIND_UNKNOWN,
 100         DECLARATION_KIND_VARIABLE_LENGTH_ARRAY,
 101         DECLARATION_KIND_GLOBAL_VARIABLE,
 102         DECLARATION_KIND_LOCAL_VARIABLE,
 103         DECLARATION_KIND_LOCAL_VARIABLE_ENTITY,
 104         DECLARATION_KIND_PARAMETER,
 105         DECLARATION_KIND_PARAMETER_ENTITY,
 106         DECLARATION_KIND_FUNCTION,
 107         DECLARATION_KIND_COMPOUND_MEMBER,
 108         DECLARATION_KIND_INNER_FUNCTION
 109 } declaration_kind_t;
 110
 111 static ir_type *get_ir_type_incomplete(type_t *type);
 112
 113 static void enqueue_inner_function(entity_t *entity)
 114 {
 115         if (inner_functions == NULL)
 116                 inner_functions = NEW_ARR_F(entity_t *, 0);
 117         ARR_APP1(entity_t*, inner_functions, entity);
 118 }
 119
 120 static ir_node *uninitialized_local_var(ir_graph *irg, ir_mode *mode, int pos)
 121 {
 122         const entity_t *entity = get_irg_loc_description(irg, pos);
 123
 124         if (entity != NULL) {
 125                 source_position_t const *const pos = &entity->base.source_position;
 126                 warningf(WARN_UNINITIALIZED, pos, "'%N' might be used uninitialized", entity);
 127         }
 128         return new_r_Unknown(irg, mode);
 129 }
 130
 131 static const char *dbg_retrieve(const dbg_info *dbg, unsigned *line)
 132 {
 133         const source_position_t *pos = (const source_position_t*) dbg;
 134         if (pos == NULL)
 135                 return NULL;
 136         if (line != NULL)
 137                 *line = pos->lineno;
 138         return pos->input_name;
 139 }
 140
 141 static dbg_info *get_dbg_info(const source_position_t *pos)
 142 {
 143         return (dbg_info*) pos;
 144 }
 145
 146 static void dbg_print_type_dbg_info(char *buffer, size_t buffer_size,
 147                                     const type_dbg_info *dbg)
 148 {
 149         assert(dbg != NULL);
 150         print_to_buffer(buffer, buffer_size);
 151         const type_t *type = (const type_t*) dbg;
 152         print_type(type);
 153         finish_print_to_buffer();
 154 }
 155
 156 static type_dbg_info *get_type_dbg_info_(const type_t *type)
 157 {
 158         return (type_dbg_info*) type;
 159 }
 160
 161 /* is the current block a reachable one? */
 162 static bool currently_reachable(void)
 163 {
 164         ir_node *const block = get_cur_block();
 165         return block != NULL && !is_Bad(block);
 166 }
 167
 168 static void set_unreachable_now(void)
 169 {
 170         set_cur_block(NULL);
 171 }
 172
 173 ir_mode *atomic_modes[ATOMIC_TYPE_LAST+1];
 174
 175 static ir_node *_expression_to_firm(const expression_t *expression);
 176 static ir_node *expression_to_firm(const expression_t *expression);
 177 static void create_local_declaration(entity_t *entity);
 178
 179 static unsigned decide_modulo_shift(unsigned type_size)
 180 {
 181         if (architecture_modulo_shift == 0)
 182                 return 0;
 183         if (type_size < architecture_modulo_shift)
 184                 return architecture_modulo_shift;
 185         return type_size;
 186 }
 187
 188 static ir_mode *init_atomic_ir_mode(atomic_type_kind_t kind)
 189 {
 190         unsigned flags = get_atomic_type_flags(kind);
 191         unsigned size  = get_atomic_type_size(kind);
 192         if ((flags & ATOMIC_TYPE_FLAG_FLOAT)
 193             && !(flags & ATOMIC_TYPE_FLAG_COMPLEX)) {
 194                 if (size == 4) {
 195                         return get_modeF();
 196                 } else if (size == 8) {
 197                         return get_modeD();
 198                 } else {
 199                         panic("unexpected kind");
 200                 }
 201         } else if (flags & ATOMIC_TYPE_FLAG_INTEGER) {
 202                 char            name[64];
 203                 unsigned        bit_size     = size * 8;
 204                 bool            is_signed    = (flags & ATOMIC_TYPE_FLAG_SIGNED) != 0;
 205                 unsigned        modulo_shift = decide_modulo_shift(bit_size);
 206
 207                 snprintf(name, sizeof(name), "%s%u", is_signed ? "I" : "U", bit_size);
 208                 return new_int_mode(name, irma_twos_complement, bit_size, is_signed,
 209                                     modulo_shift);
 210         }
 211
 212         return NULL;
 213 }
 214
 215 /**
 216  * Initialises the atomic modes depending on the machine size.
 217  */
 218 static void init_atomic_modes(void)
 219 {
 220         atomic_modes[ATOMIC_TYPE_VOID] = mode_ANY;
 221         for (int i = 0; i <= ATOMIC_TYPE_LAST; ++i) {
 222                 if (atomic_modes[i] != NULL)
 223                         continue;
 224                 atomic_modes[i] = init_atomic_ir_mode((atomic_type_kind_t) i);
 225         }
 226 }
 227
 228 ir_mode *get_atomic_mode(atomic_type_kind_t kind)
 229 {
 230         assert(kind <= ATOMIC_TYPE_LAST);
 231         return atomic_modes[kind];
 232 }
 233
 234 static ir_node *get_vla_size(array_type_t *const type)
 235 {
 236         ir_node *size_node = type->size_node;
 237         if (size_node == NULL) {
 238                 size_node = expression_to_firm(type->size_expression);
 239                 type->size_node = size_node;
 240         }
 241         return size_node;
 242 }
 243
 244 static unsigned count_parameters(const function_type_t *function_type)
 245 {
 246         unsigned count = 0;
 247
 248         function_parameter_t *parameter = function_type->parameters;
 249         for ( ; parameter != NULL; parameter = parameter->next) {
 250                 ++count;
 251         }
 252
 253         return count;
 254 }
 255
 256 /**
 257  * Creates a Firm type for an atomic type
 258  */
 259 static ir_type *create_atomic_type(atomic_type_kind_t akind, const type_t *type)
 260 {
 261         ir_mode        *mode      = atomic_modes[akind];
 262         type_dbg_info  *dbgi      = get_type_dbg_info_(type);
 263         ir_type        *irtype    = new_d_type_primitive(mode, dbgi);
 264         il_alignment_t  alignment = get_atomic_type_alignment(akind);
 265
 266         set_type_size_bytes(irtype, get_atomic_type_size(akind));
 267         set_type_alignment_bytes(irtype, alignment);
 268
 269         return irtype;
 270 }
 271
 272 /**
 273  * Creates a Firm type for a complex type
 274  */
 275 static ir_type *create_complex_type(const atomic_type_t *type)
 276 {
 277         atomic_type_kind_t  kind = type->akind;
 278         ir_mode            *mode = atomic_modes[kind];
 279         ident              *id   = get_mode_ident(mode);
 280
 281         (void) id;
 282
 283         /* FIXME: finish the array */
 284         return NULL;
 285 }
 286
 287 /**
 288  * Creates a Firm type for an imaginary type
 289  */
 290 static ir_type *create_imaginary_type(const atomic_type_t *type)
 291 {
 292         return create_atomic_type(type->akind, (const type_t*)type);
 293 }
 294
 295 /**
 296  * return type of a parameter (and take transparent union gnu extension into
 297  * account)
 298  */
 299 static type_t *get_parameter_type(type_t *orig_type)
 300 {
 301         type_t *type = skip_typeref(orig_type);
 302         if (is_type_union(type)
 303                         && get_type_modifiers(orig_type) & DM_TRANSPARENT_UNION) {
 304                 compound_t *compound = type->compound.compound;
 305                 type                 = compound->members.entities->declaration.type;
 306         }
 307
 308         return type;
 309 }
 310
 311 static ir_type *create_method_type(const function_type_t *function_type, bool for_closure)
 312 {
 313         type_t        *return_type  = skip_typeref(function_type->return_type);
 314
 315         int            n_parameters = count_parameters(function_type)
 316                                        + (for_closure ? 1 : 0);
 317         int            n_results    = return_type == type_void ? 0 : 1;
 318         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) function_type);
 319         ir_type       *irtype       = new_d_type_method(n_parameters, n_results, dbgi);
 320
 321         if (return_type != type_void) {
 322                 ir_type *restype = get_ir_type(return_type);
 323                 set_method_res_type(irtype, 0, restype);
 324         }
 325
 326         function_parameter_t *parameter = function_type->parameters;
 327         int                   n         = 0;
 328         if (for_closure) {
 329                 ir_type *p_irtype = get_ir_type(type_void_ptr);
 330                 set_method_param_type(irtype, n, p_irtype);
 331                 ++n;
 332         }
 333         for ( ; parameter != NULL; parameter = parameter->next) {
 334                 type_t  *type     = get_parameter_type(parameter->type);
 335                 ir_type *p_irtype = get_ir_type(type);
 336                 set_method_param_type(irtype, n, p_irtype);
 337                 ++n;
 338         }
 339
 340         bool is_variadic = function_type->variadic;
 341
 342         if (is_variadic)
 343                 set_method_variadicity(irtype, variadicity_variadic);
 344
 345         unsigned cc = get_method_calling_convention(irtype);
 346         switch (function_type->calling_convention) {
 347         case CC_DEFAULT: /* unspecified calling convention, equal to one of the other, typically cdecl */
 348         case CC_CDECL:
 349 is_cdecl:
 350                 set_method_calling_convention(irtype, SET_CDECL(cc));
 351                 break;
 352
 353         case CC_STDCALL:
 354                 if (is_variadic)
 355                         goto is_cdecl;
 356
 357                 /* only non-variadic function can use stdcall, else use cdecl */
 358                 set_method_calling_convention(irtype, SET_STDCALL(cc));
 359                 break;
 360
 361         case CC_FASTCALL:
 362                 if (is_variadic)
 363                         goto is_cdecl;
 364                 /* only non-variadic function can use fastcall, else use cdecl */
 365                 set_method_calling_convention(irtype, SET_FASTCALL(cc));
 366                 break;
 367
 368         case CC_THISCALL:
 369                 /* Hmm, leave default, not accepted by the parser yet. */
 370                 break;
 371         }
 372
 373         if (for_closure)
 374                 set_method_calling_convention(irtype, get_method_calling_convention(irtype) | cc_this_call);
 375
 376         const decl_modifiers_t modifiers = function_type->modifiers;
 377         if (modifiers & DM_CONST)
 378                 add_method_additional_properties(irtype, mtp_property_const);
 379         if (modifiers & DM_PURE)
 380                 add_method_additional_properties(irtype, mtp_property_pure);
 381         if (modifiers & DM_RETURNS_TWICE)
 382                 add_method_additional_properties(irtype, mtp_property_returns_twice);
 383         if (modifiers & DM_NORETURN)
 384                 add_method_additional_properties(irtype, mtp_property_noreturn);
 385         if (modifiers & DM_NOTHROW)
 386                 add_method_additional_properties(irtype, mtp_property_nothrow);
 387         if (modifiers & DM_MALLOC)
 388                 add_method_additional_properties(irtype, mtp_property_malloc);
 389
 390         return irtype;
 391 }
 392
 393 static ir_type *create_pointer_type(pointer_type_t *type)
 394 {
 395         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) type);
 396         type_t        *points_to    = type->points_to;
 397         ir_type       *ir_points_to = get_ir_type_incomplete(points_to);
 398         ir_type       *irtype       = new_d_type_pointer(ir_points_to, dbgi);
 399
 400         return irtype;
 401 }
 402
 403 static ir_type *create_reference_type(reference_type_t *type)
 404 {
 405         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) type);
 406         type_t        *refers_to    = type->refers_to;
 407         ir_type       *ir_refers_to = get_ir_type_incomplete(refers_to);
 408         ir_type       *irtype       = new_d_type_pointer(ir_refers_to, dbgi);
 409
 410         return irtype;
 411 }
 412
 413 static ir_type *create_array_type(array_type_t *type)
 414 {
 415         type_dbg_info *dbgi            = get_type_dbg_info_((const type_t*) type);
 416         type_t        *element_type    = type->element_type;
 417         ir_type       *ir_element_type = get_ir_type(element_type);
 418         ir_type       *irtype          = new_d_type_array(1, ir_element_type, dbgi);
 419
 420         const int align = get_type_alignment_bytes(ir_element_type);
 421         set_type_alignment_bytes(irtype, align);
 422
 423         if (type->size_constant) {
 424                 int n_elements = type->size;
 425
 426                 set_array_bounds_int(irtype, 0, 0, n_elements);
 427
 428                 size_t elemsize = get_type_size_bytes(ir_element_type);
 429                 if (elemsize % align > 0) {
 430                         elemsize += align - (elemsize % align);
 431                 }
 432                 set_type_size_bytes(irtype, n_elements * elemsize);
 433         } else {
 434                 set_array_lower_bound_int(irtype, 0, 0);
 435         }
 436         set_type_state(irtype, layout_fixed);
 437
 438         return irtype;
 439 }
 440
 441 /**
 442  * Return the signed integer type of size bits.
 443  *
 444  * @param size   the size
 445  */
 446 static ir_type *get_signed_int_type_for_bit_size(ir_type *base_tp,
 447                                                  unsigned size,
 448                                                                                                  const type_t *type)
 449 {
 450         static ir_mode *s_modes[64 + 1] = {NULL, };
 451         ir_type *res;
 452         ir_mode *mode;
 453
 454         if (size <= 0 || size > 64)
 455                 return NULL;
 456
 457         mode = s_modes[size];
 458         if (mode == NULL) {
 459                 char name[32];
 460
 461                 snprintf(name, sizeof(name), "bf_I%u", size);
 462                 mode = new_int_mode(name, irma_twos_complement, size, 1, 0);
 463                 s_modes[size] = mode;
 464         }
 465
 466         type_dbg_info *dbgi = get_type_dbg_info_(type);
 467         res                 = new_d_type_primitive(mode, dbgi);
 468         set_primitive_base_type(res, base_tp);
 469
 470         return res;
 471 }
 472
 473 /**
 474  * Return the unsigned integer type of size bits.
 475  *
 476  * @param size   the size
 477  */
 478 static ir_type *get_unsigned_int_type_for_bit_size(ir_type *base_tp,
 479                                                    unsigned size,
 480                                                                                                    const type_t *type)
 481 {
 482         static ir_mode *u_modes[64 + 1] = {NULL, };
 483         ir_type *res;
 484         ir_mode *mode;
 485
 486         if (size <= 0 || size > 64)
 487                 return NULL;
 488
 489         mode = u_modes[size];
 490         if (mode == NULL) {
 491                 char name[32];
 492
 493                 snprintf(name, sizeof(name), "bf_U%u", size);
 494                 mode = new_int_mode(name, irma_twos_complement, size, 0, 0);
 495                 u_modes[size] = mode;
 496         }
 497
 498         type_dbg_info *dbgi = get_type_dbg_info_(type);
 499         res = new_d_type_primitive(mode, dbgi);
 500         set_primitive_base_type(res, base_tp);
 501
 502         return res;
 503 }
 504
 505 static ir_type *create_bitfield_type(const entity_t *entity)
 506 {
 507         assert(entity->kind == ENTITY_COMPOUND_MEMBER);
 508         type_t *base = skip_typeref(entity->declaration.type);
 509         assert(base->kind == TYPE_ATOMIC || base->kind == TYPE_ENUM);
 510         ir_type *irbase = get_ir_type(base);
 511
 512         unsigned bit_size = entity->compound_member.bit_size;
 513
 514         assert(!is_type_float(base));
 515         if (is_type_signed(base)) {
 516                 return get_signed_int_type_for_bit_size(irbase, bit_size, base);
 517         } else {
 518                 return get_unsigned_int_type_for_bit_size(irbase, bit_size, base);
 519         }
 520 }
 521
 522 #define INVALID_TYPE ((ir_type*)-1)
 523
 524 enum {
 525         COMPOUND_IS_STRUCT = false,
 526         COMPOUND_IS_UNION  = true
 527 };
 528
 529 /**
 530  * Construct firm type from ast struct type.
 531  */
 532 static ir_type *create_compound_type(compound_type_t *type,
 533                                      bool incomplete, bool is_union)
 534 {
 535         compound_t *compound = type->compound;
 536
 537         if (compound->irtype != NULL && (compound->irtype_complete || incomplete)) {
 538                 return compound->irtype;
 539         }
 540
 541         symbol_t *type_symbol = compound->base.symbol;
 542         ident    *id;
 543         if (type_symbol != NULL) {
 544                 id = new_id_from_str(type_symbol->string);
 545         } else {
 546                 if (is_union) {
 547                         id = id_unique("__anonymous_union.%u");
 548                 } else {
 549                         id = id_unique("__anonymous_struct.%u");
 550                 }
 551         }
 552
 553         ir_type *irtype;
 554         if (is_union) {
 555                 irtype = new_type_union(id);
 556         } else {
 557                 irtype = new_type_struct(id);
 558         }
 559
 560         compound->irtype_complete = false;
 561         compound->irtype          = irtype;
 562
 563         if (incomplete)
 564                 return irtype;
 565
 566         if (is_union) {
 567                 layout_union_type(type);
 568         } else {
 569                 layout_struct_type(type);
 570         }
 571
 572         compound->irtype_complete = true;
 573
 574         entity_t *entry = compound->members.entities;
 575         for ( ; entry != NULL; entry = entry->base.next) {
 576                 if (entry->kind != ENTITY_COMPOUND_MEMBER)
 577                         continue;
 578
 579                 symbol_t *symbol     = entry->base.symbol;
 580                 type_t   *entry_type = entry->declaration.type;
 581                 ident    *ident;
 582                 if (symbol == NULL) {
 583                         /* anonymous bitfield member, skip */
 584                         if (entry->compound_member.bitfield)
 585                                 continue;
 586                         assert(entry_type->kind == TYPE_COMPOUND_STRUCT
 587                                         || entry_type->kind == TYPE_COMPOUND_UNION);
 588                         ident = id_unique("anon.%u");
 589                 } else {
 590                         ident = new_id_from_str(symbol->string);
 591                 }
 592
 593                 dbg_info *dbgi       = get_dbg_info(&entry->base.source_position);
 594
 595                 ir_type *entry_irtype;
 596                 if (entry->compound_member.bitfield) {
 597                         entry_irtype = create_bitfield_type(entry);
 598                 } else {
 599                         entry_irtype = get_ir_type(entry_type);
 600                 }
 601                 ir_entity *entity = new_d_entity(irtype, ident, entry_irtype, dbgi);
 602
 603                 set_entity_offset(entity, entry->compound_member.offset);
 604                 set_entity_offset_bits_remainder(entity,
 605                                                  entry->compound_member.bit_offset);
 606
 607                 assert(entry->declaration.kind == DECLARATION_KIND_UNKNOWN);
 608                 entry->declaration.kind       = DECLARATION_KIND_COMPOUND_MEMBER;
 609                 entry->compound_member.entity = entity;
 610         }
 611
 612         set_type_alignment_bytes(irtype, compound->alignment);
 613         set_type_size_bytes(irtype, compound->size);
 614         set_type_state(irtype, layout_fixed);
 615
 616         return irtype;
 617 }
 618
 619 static ir_tarval *fold_constant_to_tarval(expression_t const *);
 620
 621 static void determine_enum_values(enum_type_t *const type)
 622 {
 623         ir_mode   *const mode    = atomic_modes[type->base.akind];
 624         ir_tarval *const one     = get_mode_one(mode);
 625         ir_tarval *      tv_next = get_mode_null(mode);
 626
 627         enum_t   *enume = type->enume;
 628         entity_t *entry = enume->base.next;
 629         for (; entry != NULL; entry = entry->base.next) {
 630                 if (entry->kind != ENTITY_ENUM_VALUE)
 631                         break;
 632
 633                 expression_t *const init = entry->enum_value.value;
 634                 if (init != NULL) {
 635                         tv_next = fold_constant_to_tarval(init);
 636                 }
 637                 assert(entry->enum_value.tv == NULL || entry->enum_value.tv == tv_next);
 638                 entry->enum_value.tv = tv_next;
 639                 tv_next = tarval_add(tv_next, one);
 640         }
 641 }
 642
 643 static ir_type *create_enum_type(enum_type_t *const type)
 644 {
 645         return create_atomic_type(type->base.akind, (const type_t*) type);
 646 }
 647
 648 static ir_type *get_ir_type_incomplete(type_t *type)
 649 {
 650         assert(type != NULL);
 651         type = skip_typeref(type);
 652
 653         if (type->base.firm_type != NULL) {
 654                 assert(type->base.firm_type != INVALID_TYPE);
 655                 return type->base.firm_type;
 656         }
 657
 658         switch (type->kind) {
 659         case TYPE_COMPOUND_STRUCT:
 660                 return create_compound_type(&type->compound, true, COMPOUND_IS_STRUCT);
 661         case TYPE_COMPOUND_UNION:
 662                 return create_compound_type(&type->compound, true, COMPOUND_IS_UNION);
 663         default:
 664                 return get_ir_type(type);
 665         }
 666 }
 667
 668 ir_type *get_ir_type(type_t *type)
 669 {
 670         assert(type != NULL);
 671
 672         type = skip_typeref(type);
 673
 674         if (type->base.firm_type != NULL) {
 675                 assert(type->base.firm_type != INVALID_TYPE);
 676                 return type->base.firm_type;
 677         }
 678
 679         ir_type *firm_type = NULL;
 680         switch (type->kind) {
 681         case TYPE_ATOMIC:
 682                 firm_type = create_atomic_type(type->atomic.akind, type);
 683                 break;
 684         case TYPE_COMPLEX:
 685                 firm_type = create_complex_type(&type->atomic);
 686                 break;
 687         case TYPE_IMAGINARY:
 688                 firm_type = create_imaginary_type(&type->atomic);
 689                 break;
 690         case TYPE_FUNCTION:
 691                 firm_type = create_method_type(&type->function, false);
 692                 break;
 693         case TYPE_POINTER:
 694                 firm_type = create_pointer_type(&type->pointer);
 695                 break;
 696         case TYPE_REFERENCE:
 697                 firm_type = create_reference_type(&type->reference);
 698                 break;
 699         case TYPE_ARRAY:
 700                 firm_type = create_array_type(&type->array);
 701                 break;
 702         case TYPE_COMPOUND_STRUCT:
 703                 firm_type = create_compound_type(&type->compound, false, COMPOUND_IS_STRUCT);
 704                 break;
 705         case TYPE_COMPOUND_UNION:
 706                 firm_type = create_compound_type(&type->compound, false, COMPOUND_IS_UNION);
 707                 break;
 708         case TYPE_ENUM:
 709                 firm_type = create_enum_type(&type->enumt);
 710                 break;
 711
 712         case TYPE_ERROR:
 713         case TYPE_TYPEOF:
 714         case TYPE_TYPEDEF:
 715                 break;
 716         }
 717         if (firm_type == NULL)
 718                 panic("unknown type found");
 719
 720         type->base.firm_type = firm_type;
 721         return firm_type;
 722 }
 723
 724 static ir_mode *get_ir_mode_storage(type_t *type)
 725 {
 726         ir_type *irtype = get_ir_type(type);
 727
 728         /* firm doesn't report a mode for arrays somehow... */
 729         if (is_Array_type(irtype)) {
 730                 return mode_P_data;
 731         }
 732
 733         ir_mode *mode = get_type_mode(irtype);
 734         assert(mode != NULL);
 735         return mode;
 736 }
 737
 738 /*
 739  * get arithmetic mode for a type. This is different from get_ir_mode_storage,
 740  * int that it returns bigger modes for floating point on some platforms
 741  * (x87 internally does arithemtic with 80bits)
 742  */
 743 static ir_mode *get_ir_mode_arithmetic(type_t *type)
 744 {
 745         ir_mode *mode = get_ir_mode_storage(type);
 746         if (mode_is_float(mode) && mode_float_arithmetic != NULL) {
 747                 return mode_float_arithmetic;
 748         }
 749
 750         return mode;
 751 }
 752
 753 /**
 754  * Return a node representing the size of a type.
 755  */
 756 static ir_node *get_type_size_node(type_t *type)
 757 {
 758         unsigned size;
 759         ir_mode *mode = get_ir_mode_arithmetic(type_size_t);
 760         type = skip_typeref(type);
 761
 762         if (is_type_array(type) && type->array.is_vla) {
 763                 ir_node *size_node = get_vla_size(&type->array);
 764                 ir_node *elem_size = get_type_size_node(type->array.element_type);
 765                 ir_node *real_size = new_d_Mul(NULL, size_node, elem_size, mode);
 766                 return real_size;
 767         }
 768
 769         size = get_type_size(type);
 770         return new_Const_long(mode, size);
 771 }
 772
 773 /** Names of the runtime functions. */
 774 static const struct {
 775         int        id;           /**< the rts id */
 776         int        n_res;        /**< number of return values */
 777         const char *name;        /**< the name of the rts function */
 778         int        n_params;     /**< number of parameters */
 779         unsigned   flags;        /**< language flags */
 780 } rts_data[] = {
 781         { rts_debugbreak, 0, "__debugbreak", 0, _MS },
 782         { rts_abort,      0, "abort",        0, _C89 },
 783         { rts_alloca,     1, "alloca",       1, _ALL },
 784         { rts_abs,        1, "abs",          1, _C89 },
 785         { rts_labs,       1, "labs",         1, _C89 },
 786         { rts_llabs,      1, "llabs",        1, _C99 },
 787         { rts_imaxabs,    1, "imaxabs",      1, _C99 },
 788
 789         { rts_fabs,       1, "fabs",         1, _C89 },
 790         { rts_sqrt,       1, "sqrt",         1, _C89 },
 791         { rts_cbrt,       1, "cbrt",         1, _C99 },
 792         { rts_exp,        1, "exp",          1, _C89 },
 793         { rts_exp2,       1, "exp2",         1, _C89 },
 794         { rts_exp10,      1, "exp10",        1, _GNUC },
 795         { rts_log,        1, "log",          1, _C89 },
 796         { rts_log2,       1, "log2",         1, _C89 },
 797         { rts_log10,      1, "log10",        1, _C89 },
 798         { rts_pow,        1, "pow",          2, _C89 },
 799         { rts_sin,        1, "sin",          1, _C89 },
 800         { rts_cos,        1, "cos",          1, _C89 },
 801         { rts_tan,        1, "tan",          1, _C89 },
 802         { rts_asin,       1, "asin",         1, _C89 },
 803         { rts_acos,       1, "acos",         1, _C89 },
 804         { rts_atan,       1, "atan",         1, _C89 },
 805         { rts_sinh,       1, "sinh",         1, _C89 },
 806         { rts_cosh,       1, "cosh",         1, _C89 },
 807         { rts_tanh,       1, "tanh",         1, _C89 },
 808
 809         { rts_fabsf,      1, "fabsf",        1, _C99 },
 810         { rts_sqrtf,      1, "sqrtf",        1, _C99 },
 811         { rts_cbrtf,      1, "cbrtf",        1, _C99 },
 812         { rts_expf,       1, "expf",         1, _C99 },
 813         { rts_exp2f,      1, "exp2f",        1, _C99 },
 814         { rts_exp10f,     1, "exp10f",       1, _GNUC },
 815         { rts_logf,       1, "logf",         1, _C99 },
 816         { rts_log2f,      1, "log2f",        1, _C99 },
 817         { rts_log10f,     1, "log10f",       1, _C99 },
 818         { rts_powf,       1, "powf",         2, _C99 },
 819         { rts_sinf,       1, "sinf",         1, _C99 },
 820         { rts_cosf,       1, "cosf",         1, _C99 },
 821         { rts_tanf,       1, "tanf",         1, _C99 },
 822         { rts_asinf,      1, "asinf",        1, _C99 },
 823         { rts_acosf,      1, "acosf",        1, _C99 },
 824         { rts_atanf,      1, "atanf",        1, _C99 },
 825         { rts_sinhf,      1, "sinhf",        1, _C99 },
 826         { rts_coshf,      1, "coshf",        1, _C99 },
 827         { rts_tanhf,      1, "tanhf",        1, _C99 },
 828
 829         { rts_fabsl,      1, "fabsl",        1, _C99 },
 830         { rts_sqrtl,      1, "sqrtl",        1, _C99 },
 831         { rts_cbrtl,      1, "cbrtl",        1, _C99 },
 832         { rts_expl,       1, "expl",         1, _C99 },
 833         { rts_exp2l,      1, "exp2l",        1, _C99 },
 834         { rts_exp10l,     1, "exp10l",       1, _GNUC },
 835         { rts_logl,       1, "logl",         1, _C99 },
 836         { rts_log2l,      1, "log2l",        1, _C99 },
 837         { rts_log10l,     1, "log10l",       1, _C99 },
 838         { rts_powl,       1, "powl",         2, _C99 },
 839         { rts_sinl,       1, "sinl",         1, _C99 },
 840         { rts_cosl,       1, "cosl",         1, _C99 },
 841         { rts_tanl,       1, "tanl",         1, _C99 },
 842         { rts_asinl,      1, "asinl",        1, _C99 },
 843         { rts_acosl,      1, "acosl",        1, _C99 },
 844         { rts_atanl,      1, "atanl",        1, _C99 },
 845         { rts_sinhl,      1, "sinhl",        1, _C99 },
 846         { rts_coshl,      1, "coshl",        1, _C99 },
 847         { rts_tanhl,      1, "tanhl",        1, _C99 },
 848
 849         { rts_strcmp,     1, "strcmp",       2, _C89 },
 850         { rts_strncmp,    1, "strncmp",      3, _C89 },
 851         { rts_strcpy,     1, "strcpy",       2, _C89 },
 852         { rts_strlen,     1, "strlen",       1, _C89 },
 853         { rts_memcpy,     1, "memcpy",       3, _C89 },
 854         { rts_mempcpy,    1, "mempcpy",      3, _GNUC },
 855         { rts_memmove,    1, "memmove",      3, _C89 },
 856         { rts_memset,     1, "memset",       3, _C89 },
 857         { rts_memcmp,     1, "memcmp",       3, _C89 },
 858 };
 859
 860 static ident *rts_idents[lengthof(rts_data)];
 861
 862 static create_ld_ident_func create_ld_ident = create_name_linux_elf;
 863
 864 void set_create_ld_ident(ident *(*func)(entity_t*))
 865 {
 866         create_ld_ident = func;
 867 }
 868
 869 /**
 870  * Handle GNU attributes for entities
 871  *
 872  * @param ent   the entity
 873  * @param decl  the routine declaration
 874  */
 875 static void handle_decl_modifiers(ir_entity *irentity, entity_t *entity)
 876 {
 877         assert(is_declaration(entity));
 878         decl_modifiers_t modifiers = entity->declaration.modifiers;
 879
 880         if (is_method_entity(irentity)) {
 881                 if (modifiers & DM_PURE) {
 882                         set_entity_additional_properties(irentity, mtp_property_pure);
 883                 }
 884                 if (modifiers & DM_CONST) {
 885                         add_entity_additional_properties(irentity, mtp_property_const);
 886                 }
 887         }
 888         if (modifiers & DM_USED) {
 889                 add_entity_linkage(irentity, IR_LINKAGE_HIDDEN_USER);
 890         }
 891         if (modifiers & DM_WEAK) {
 892                 add_entity_linkage(irentity, IR_LINKAGE_WEAK);
 893         }
 894 }
 895
 896 static bool is_main(entity_t *entity)
 897 {
 898         static symbol_t *sym_main = NULL;
 899         if (sym_main == NULL) {
 900                 sym_main = symbol_table_insert("main");
 901         }
 902
 903         if (entity->base.symbol != sym_main)
 904                 return false;
 905         /* must be in outermost scope */
 906         if (entity->base.parent_scope != &current_translation_unit->scope)
 907                 return false;
 908
 909         return true;
 910 }
 911
 912 /**
 913  * Creates an entity representing a function.
 914  *
 915  * @param entity       the function declaration/definition
 916  * @param owner_type   the owner type of this function, NULL
 917  *                     for global functions
 918  */
 919 static ir_entity *get_function_entity(entity_t *entity, ir_type *owner_type)
 920 {
 921         assert(entity->kind == ENTITY_FUNCTION);
 922         if (entity->function.irentity != NULL)
 923                 return entity->function.irentity;
 924
 925         switch (entity->function.btk) {
 926         case BUILTIN_NONE:
 927         case BUILTIN_LIBC:
 928         case BUILTIN_LIBC_CHECK:
 929                 break;
 930         default:
 931                 return NULL;
 932         }
 933
 934         if (is_main(entity)) {
 935                 /* force main to C linkage */
 936                 type_t *type = entity->declaration.type;
 937                 assert(is_type_function(type));
 938                 if (type->function.linkage != LINKAGE_C) {
 939                         type_t *new_type           = duplicate_type(type);
 940                         new_type->function.linkage = LINKAGE_C;
 941                         type                       = identify_new_type(new_type);
 942                         entity->declaration.type   = type;
 943                 }
 944         }
 945
 946         symbol_t *symbol = entity->base.symbol;
 947         ident    *id     = new_id_from_str(symbol->string);
 948
 949         /* already an entity defined? */
 950         ir_entity *irentity = entitymap_get(&entitymap, symbol);
 951         bool const has_body = entity->function.statement != NULL;
 952         if (irentity != NULL) {
 953                 if (get_entity_visibility(irentity) == ir_visibility_external
 954                                 && has_body) {
 955                         set_entity_visibility(irentity, ir_visibility_default);
 956                 }
 957                 goto entity_created;
 958         }
 959
 960         ir_type *ir_type_method;
 961         if (entity->function.need_closure)
 962                 ir_type_method = create_method_type(&entity->declaration.type->function, true);
 963         else
 964                 ir_type_method = get_ir_type(entity->declaration.type);
 965
 966         bool nested_function = false;
 967         if (owner_type == NULL)
 968                 owner_type = get_glob_type();
 969         else
 970                 nested_function = true;
 971
 972         dbg_info *const dbgi = get_dbg_info(&entity->base.source_position);
 973         irentity = new_d_entity(owner_type, id, ir_type_method, dbgi);
 974
 975         ident *ld_id;
 976         if (nested_function)
 977                 ld_id = id_unique("inner.%u");
 978         else
 979                 ld_id = create_ld_ident(entity);
 980         set_entity_ld_ident(irentity, ld_id);
 981
 982         handle_decl_modifiers(irentity, entity);
 983
 984         if (! nested_function) {
 985                 /* static inline             => local
 986                  * extern inline             => local
 987                  * inline without definition => local
 988                  * inline with definition    => external_visible */
 989                 storage_class_tag_t const storage_class
 990                         = (storage_class_tag_t) entity->declaration.storage_class;
 991                 bool                const is_inline     = entity->function.is_inline;
 992
 993                 if (is_inline && storage_class == STORAGE_CLASS_NONE && has_body) {
 994                     set_entity_visibility(irentity, ir_visibility_default);
 995                 } else if (storage_class == STORAGE_CLASS_STATIC ||
 996                            (is_inline && has_body)) {
 997                     set_entity_visibility(irentity, ir_visibility_local);
 998                 } else if (has_body) {
 999                     set_entity_visibility(irentity, ir_visibility_default);
1000                 } else {
1001                     set_entity_visibility(irentity, ir_visibility_external);
1002                 }
1003         } else {
1004                 /* nested functions are always local */
1005                 set_entity_visibility(irentity, ir_visibility_local);
1006         }
1007
1008         /* We should check for file scope here, but as long as we compile C only
1009            this is not needed. */
1010         if (!freestanding && !has_body) {
1011                 /* check for a known runtime function */
1012                 for (size_t i = 0; i < lengthof(rts_data); ++i) {
1013                         if (id != rts_idents[i])
1014                                 continue;
1015
1016                         function_type_t *function_type
1017                                 = &entity->declaration.type->function;
1018                         /* rts_entities code can't handle a "wrong" number of parameters */
1019                         if (function_type->unspecified_parameters)
1020                                 continue;
1021
1022                         /* check number of parameters */
1023                         int n_params = count_parameters(function_type);
1024                         if (n_params != rts_data[i].n_params)
1025                                 continue;
1026
1027                         type_t *return_type = skip_typeref(function_type->return_type);
1028                         int     n_res       = return_type != type_void ? 1 : 0;
1029                         if (n_res != rts_data[i].n_res)
1030                                 continue;
1031
1032                         /* ignore those rts functions not necessary needed for current mode */
1033                         if ((c_mode & rts_data[i].flags) == 0)
1034                                 continue;
1035                         assert(rts_entities[rts_data[i].id] == NULL);
1036                         rts_entities[rts_data[i].id] = irentity;
1037                 }
1038         }
1039
1040         entitymap_insert(&entitymap, symbol, irentity);
1041
1042 entity_created:
1043         entity->declaration.kind  = DECLARATION_KIND_FUNCTION;
1044         entity->function.irentity = irentity;
1045
1046         return irentity;
1047 }
1048
1049 /**
1050  * Creates a SymConst for a given entity.
1051  *
1052  * @param dbgi    debug info
1053  * @param entity  the entity
1054  */
1055 static ir_node *create_symconst(dbg_info *dbgi, ir_entity *entity)
1056 {
1057         assert(entity != NULL);
1058         union symconst_symbol sym;
1059         sym.entity_p = entity;
1060         return new_d_SymConst(dbgi, mode_P, sym, symconst_addr_ent);
1061 }
1062
1063 static ir_node *create_Const_from_bool(ir_mode *const mode, bool const v)
1064 {
1065         return new_Const((v ? get_mode_one : get_mode_null)(mode));
1066 }
1067
1068 static ir_node *create_conv_from_b(dbg_info *dbgi, ir_node *value,
1069                                    ir_mode *dest_mode)
1070 {
1071         if (is_Const(value)) {
1072                 return create_Const_from_bool(dest_mode, !is_Const_null(value));
1073         }
1074
1075         ir_node *cond       = new_d_Cond(dbgi, value);
1076         ir_node *proj_true  = new_Proj(cond, mode_X, pn_Cond_true);
1077         ir_node *proj_false = new_Proj(cond, mode_X, pn_Cond_false);
1078         ir_node *tblock     = new_Block(1, &proj_true);
1079         ir_node *fblock     = new_Block(1, &proj_false);
1080         set_cur_block(tblock);
1081         ir_node *const1 = new_Const(get_mode_one(dest_mode));
1082         ir_node *tjump  = new_Jmp();
1083         set_cur_block(fblock);
1084         ir_node *const0 = new_Const(get_mode_null(dest_mode));
1085         ir_node *fjump  = new_Jmp();
1086
1087         ir_node *in[2]      = { tjump, fjump };
1088         ir_node *mergeblock = new_Block(2, in);
1089         set_cur_block(mergeblock);
1090         ir_node *phi_in[2]  = { const1, const0 };
1091         ir_node *phi        = new_Phi(2, phi_in, dest_mode);
1092         return phi;
1093 }
1094
1095 static ir_node *create_conv(dbg_info *dbgi, ir_node *value, ir_mode *dest_mode)
1096 {
1097         ir_mode *value_mode = get_irn_mode(value);
1098
1099         if (value_mode == dest_mode)
1100                 return value;
1101
1102         if (dest_mode == mode_b) {
1103                 ir_node *zero = new_Const(get_mode_null(value_mode));
1104                 ir_node *cmp  = new_d_Cmp(dbgi, value, zero, ir_relation_unordered_less_greater);
1105                 return cmp;
1106         } else if (value_mode == mode_b) {
1107                 return create_conv_from_b(dbgi, value, dest_mode);
1108         }
1109
1110         return new_d_Conv(dbgi, value, dest_mode);
1111 }
1112
1113 /**
1114  * Creates a SymConst node representing a wide string literal.
1115  *
1116  * @param literal   the wide string literal
1117  */
1118 static ir_node *wide_string_literal_to_firm(
1119                 const string_literal_expression_t *literal)
1120 {
1121         ir_type  *const global_type = get_glob_type();
1122         ir_type  *const elem_type   = ir_type_wchar_t;
1123         dbg_info *const dbgi        = get_dbg_info(&literal->base.source_position);
1124         ir_type  *const type        = new_type_array(1, elem_type);
1125
1126         ident     *const id     = id_unique("str.%u");
1127         ir_entity *const entity = new_d_entity(global_type, id, type, dbgi);
1128         set_entity_ld_ident(entity, id);
1129         set_entity_visibility(entity, ir_visibility_private);
1130         add_entity_linkage(entity, IR_LINKAGE_CONSTANT);
1131
1132         ir_mode      *const mode = get_type_mode(elem_type);
1133         const size_t        slen = wstrlen(&literal->value);
1134
1135         set_array_lower_bound_int(type, 0, 0);
1136         set_array_upper_bound_int(type, 0, slen);
1137         set_type_size_bytes(type, slen * get_mode_size_bytes(mode));
1138         set_type_state(type, layout_fixed);
1139
1140         ir_initializer_t *initializer = create_initializer_compound(slen);
1141         const char              *p    = literal->value.begin;
1142         for (size_t i = 0; i < slen; ++i) {
1143                 assert(p < literal->value.begin + literal->value.size);
1144                 utf32             v   = read_utf8_char(&p);
1145                 ir_tarval        *tv  = new_tarval_from_long(v, mode);
1146                 ir_initializer_t *val = create_initializer_tarval(tv);
1147                 set_initializer_compound_value(initializer, i, val);
1148         }
1149         set_entity_initializer(entity, initializer);
1150
1151         return create_symconst(dbgi, entity);
1152 }
1153
1154 /**
1155  * Creates a SymConst node representing a string constant.
1156  *
1157  * @param src_pos    the source position of the string constant
1158  * @param id_prefix  a prefix for the name of the generated string constant
1159  * @param value      the value of the string constant
1160  */
1161 static ir_node *string_to_firm(const source_position_t *const src_pos,
1162                                const char *const id_prefix,
1163                                const string_t *const value)
1164 {
1165         ir_type  *const global_type = get_glob_type();
1166         dbg_info *const dbgi        = get_dbg_info(src_pos);
1167         ir_type  *const type        = new_type_array(1, ir_type_const_char);
1168
1169         ident     *const id     = id_unique(id_prefix);
1170         ir_entity *const entity = new_d_entity(global_type, id, type, dbgi);
1171         set_entity_ld_ident(entity, id);
1172         set_entity_visibility(entity, ir_visibility_private);
1173         add_entity_linkage(entity, IR_LINKAGE_CONSTANT);
1174
1175         ir_type *const elem_type = ir_type_const_char;
1176         ir_mode *const mode      = get_type_mode(elem_type);
1177
1178         const char* const string = value->begin;
1179         const size_t      slen   = value->size;
1180
1181         set_array_lower_bound_int(type, 0, 0);
1182         set_array_upper_bound_int(type, 0, slen);
1183         set_type_size_bytes(type, slen);
1184         set_type_state(type, layout_fixed);
1185
1186         ir_initializer_t *initializer = create_initializer_compound(slen);
1187         for (size_t i = 0; i < slen; ++i) {
1188                 ir_tarval        *tv  = new_tarval_from_long(string[i], mode);
1189                 ir_initializer_t *val = create_initializer_tarval(tv);
1190                 set_initializer_compound_value(initializer, i, val);
1191         }
1192         set_entity_initializer(entity, initializer);
1193
1194         return create_symconst(dbgi, entity);
1195 }
1196
1197 static bool try_create_integer(literal_expression_t *literal,
1198                                type_t *type, unsigned char base)
1199 {
1200         const char *string = literal->value.begin;
1201         size_t      size   = literal->value.size;
1202
1203         assert(type->kind == TYPE_ATOMIC);
1204         atomic_type_kind_t akind = type->atomic.akind;
1205
1206         ir_mode   *mode = atomic_modes[akind];
1207         ir_tarval *tv   = new_integer_tarval_from_str(string, size, 1, base, mode);
1208         if (tv == tarval_bad)
1209                 return false;
1210
1211         literal->base.type    = type;
1212         literal->target_value = tv;
1213         return true;
1214 }
1215
1216 static void create_integer_tarval(literal_expression_t *literal)
1217 {
1218         unsigned        us     = 0;
1219         unsigned        ls     = 0;
1220         const string_t *suffix = &literal->suffix;
1221         /* parse suffix */
1222         if (suffix->size > 0) {
1223                 for (const char *c = suffix->begin; *c != '\0'; ++c) {
1224                         if (*c == 'u' || *c == 'U') { ++us; }
1225                         if (*c == 'l' || *c == 'L') { ++ls; }
1226                 }
1227         }
1228
1229         unsigned base;
1230         switch (literal->base.kind) {
1231                 case EXPR_LITERAL_INTEGER_OCTAL:       base =  8; break;
1232                 case EXPR_LITERAL_INTEGER:             base = 10; break;
1233                 case EXPR_LITERAL_INTEGER_HEXADECIMAL: base = 16; break;
1234                 default: panic("invalid literal kind");
1235         }
1236
1237         tarval_int_overflow_mode_t old_mode = tarval_get_integer_overflow_mode();
1238
1239         /* now try if the constant is small enough for some types */
1240         tarval_set_integer_overflow_mode(TV_OVERFLOW_BAD);
1241         if (ls < 1) {
1242                 if (us == 0 && try_create_integer(literal, type_int, base))
1243                         goto finished;
1244                 if ((us == 1 || base != 10)
1245                                 && try_create_integer(literal, type_unsigned_int, base))
1246                         goto finished;
1247         }
1248         if (ls < 2) {
1249                 if (us == 0 && try_create_integer(literal, type_long, base))
1250                         goto finished;
1251                 if ((us == 1 || base != 10)
1252                                 && try_create_integer(literal, type_unsigned_long, base))
1253                         goto finished;
1254         }
1255         /* last try? then we should not report tarval_bad */
1256         if (us != 1 && base == 10)
1257                 tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
1258         if (us == 0 && try_create_integer(literal, type_long_long, base))
1259                 goto finished;
1260
1261         /* last try */
1262         assert(us == 1 || base != 10);
1263         tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
1264         bool res = try_create_integer(literal, type_unsigned_long_long, base);
1265         if (!res)
1266                 panic("internal error when parsing number literal");
1267
1268 finished:
1269         tarval_set_integer_overflow_mode(old_mode);
1270 }
1271
1272 void determine_literal_type(literal_expression_t *literal)
1273 {
1274         switch (literal->base.kind) {
1275         case EXPR_LITERAL_INTEGER:
1276         case EXPR_LITERAL_INTEGER_OCTAL:
1277         case EXPR_LITERAL_INTEGER_HEXADECIMAL:
1278                 create_integer_tarval(literal);
1279                 return;
1280         default:
1281                 break;
1282         }
1283 }
1284
1285 /**
1286  * Creates a Const node representing a constant.
1287  */
1288 static ir_node *literal_to_firm(const literal_expression_t *literal)
1289 {
1290         type_t     *type   = skip_typeref(literal->base.type);
1291         ir_mode    *mode   = get_ir_mode_storage(type);
1292         const char *string = literal->value.begin;
1293         size_t      size   = literal->value.size;
1294         ir_tarval  *tv;
1295
1296         switch (literal->base.kind) {
1297         case EXPR_LITERAL_WIDE_CHARACTER: {
1298                 utf32  v = read_utf8_char(&string);
1299                 char   buf[128];
1300                 size_t len = snprintf(buf, sizeof(buf), UTF32_PRINTF_FORMAT, v);
1301
1302                 tv = new_tarval_from_str(buf, len, mode);
1303                 goto make_const;
1304         }
1305         case EXPR_LITERAL_CHARACTER: {
1306                 long long int v;
1307                 bool char_is_signed
1308                         = get_atomic_type_flags(ATOMIC_TYPE_CHAR) & ATOMIC_TYPE_FLAG_SIGNED;
1309                 if (size == 1 && char_is_signed) {
1310                         v = (signed char)string[0];
1311                 } else {
1312                         v = 0;
1313                         for (size_t i = 0; i < size; ++i) {
1314                                 v = (v << 8) | ((unsigned char)string[i]);
1315                         }
1316                 }
1317                 char   buf[128];
1318                 size_t len = snprintf(buf, sizeof(buf), "%lld", v);
1319
1320                 tv = new_tarval_from_str(buf, len, mode);
1321                 goto make_const;
1322         }
1323         case EXPR_LITERAL_INTEGER:
1324         case EXPR_LITERAL_INTEGER_OCTAL:
1325         case EXPR_LITERAL_INTEGER_HEXADECIMAL:
1326                 assert(literal->target_value != NULL);
1327                 tv = literal->target_value;
1328                 goto make_const;
1329         case EXPR_LITERAL_FLOATINGPOINT:
1330                 tv = new_tarval_from_str(string, size, mode);
1331                 goto make_const;
1332         case EXPR_LITERAL_FLOATINGPOINT_HEXADECIMAL: {
1333                 char buffer[size + 2];
1334                 memcpy(buffer, "0x", 2);
1335                 memcpy(buffer+2, string, size);
1336                 tv = new_tarval_from_str(buffer, size+2, mode);
1337                 goto make_const;
1338         }
1339         case EXPR_LITERAL_BOOLEAN:
1340                 if (string[0] == 't') {
1341                         tv = get_mode_one(mode);
1342                 } else {
1343                         assert(string[0] == 'f');
1344                         tv = get_mode_null(mode);
1345                 }
1346                 goto make_const;
1347         case EXPR_LITERAL_MS_NOOP:
1348                 tv = get_mode_null(mode);
1349                 goto make_const;
1350         default:
1351                 break;
1352         }
1353         panic("Invalid literal kind found");
1354
1355 make_const: ;
1356         dbg_info *dbgi       = get_dbg_info(&literal->base.source_position);
1357         ir_node  *res        = new_d_Const(dbgi, tv);
1358         ir_mode  *mode_arith = get_ir_mode_arithmetic(type);
1359         return create_conv(dbgi, res, mode_arith);
1360 }
1361
1362 /*
1363  * Allocate an area of size bytes aligned at alignment
1364  * at a frame type.
1365  */
1366 static ir_entity *alloc_trampoline(ir_type *frame_type, int size, unsigned alignment)
1367 {
1368         static unsigned area_cnt = 0;
1369         char buf[32];
1370
1371         ir_type *tp = new_type_array(1, ir_type_char);
1372         set_array_bounds_int(tp, 0, 0, size);
1373         set_type_alignment_bytes(tp, alignment);
1374
1375         snprintf(buf, sizeof(buf), "trampolin%u", area_cnt++);
1376         ident *name = new_id_from_str(buf);
1377         ir_entity *area = new_entity(frame_type, name, tp);
1378
1379         /* mark this entity as compiler generated */
1380         set_entity_compiler_generated(area, 1);
1381         return area;
1382 }
1383
1384 /**
1385  * Return a node representing a trampoline region
1386  * for a given function entity.
1387  *
1388  * @param dbgi    debug info
1389  * @param entity  the function entity
1390  */
1391 static ir_node *get_trampoline_region(dbg_info *dbgi, ir_entity *entity)
1392 {
1393         ir_entity *region = NULL;
1394         int        i;
1395
1396         if (current_trampolines != NULL) {
1397                 for (i = ARR_LEN(current_trampolines) - 1; i >= 0; --i) {
1398                         if (current_trampolines[i].function == entity) {
1399                                 region = current_trampolines[i].region;
1400                                 break;
1401                         }
1402                 }
1403         } else {
1404                 current_trampolines = NEW_ARR_F(trampoline_region, 0);
1405         }
1406         ir_graph *irg = current_ir_graph;
1407         if (region == NULL) {
1408                 /* create a new region */
1409                 ir_type           *frame_tp = get_irg_frame_type(irg);
1410                 trampoline_region  reg;
1411                 reg.function = entity;
1412
1413                 reg.region   = alloc_trampoline(frame_tp,
1414                                                 be_params->trampoline_size,
1415                                                 be_params->trampoline_align);
1416                 ARR_APP1(trampoline_region, current_trampolines, reg);
1417                 region = reg.region;
1418         }
1419         return new_d_simpleSel(dbgi, get_irg_no_mem(irg), get_irg_frame(irg),
1420                                region);
1421 }
1422
1423 /**
1424  * Creates a trampoline for a function represented by an entity.
1425  *
1426  * @param dbgi    debug info
1427  * @param mode    the (reference) mode for the function address
1428  * @param entity  the function entity
1429  */
1430 static ir_node *create_trampoline(dbg_info *dbgi, ir_mode *mode,
1431                                   ir_entity *entity)
1432 {
1433         assert(entity != NULL);
1434         ir_node *in[3];
1435         in[0] = get_trampoline_region(dbgi, entity);
1436         in[1] = create_symconst(dbgi, entity);
1437         in[2] = get_irg_frame(current_ir_graph);
1438
1439         ir_node *irn = new_d_Builtin(dbgi, get_store(), 3, in, ir_bk_inner_trampoline, get_unknown_type());
1440         set_store(new_Proj(irn, mode_M, pn_Builtin_M));
1441         return new_Proj(irn, mode, pn_Builtin_max+1);
1442 }
1443
1444 /**
1445  * Dereference an address.
1446  *
1447  * @param dbgi  debug info
1448  * @param type  the type of the dereferenced result (the points_to type)
1449  * @param addr  the address to dereference
1450  */
1451 static ir_node *deref_address(dbg_info *const dbgi, type_t *const type,
1452                                       ir_node *const addr)
1453 {
1454         type_t *skipped = skip_typeref(type);
1455         if (is_type_incomplete(skipped))
1456                 return addr;
1457
1458         ir_type *irtype = get_ir_type(skipped);
1459         if (is_compound_type(irtype)
1460             || is_Method_type(irtype)
1461             || is_Array_type(irtype)) {
1462                 return addr;
1463         }
1464
1465         ir_cons_flags  flags    = skipped->base.qualifiers & TYPE_QUALIFIER_VOLATILE
1466                                   ? cons_volatile : cons_none;
1467         ir_mode *const mode     = get_type_mode(irtype);
1468         ir_node *const memory   = get_store();
1469         ir_node *const load     = new_d_Load(dbgi, memory, addr, mode, flags);
1470         ir_node *const load_mem = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1471         ir_node *const load_res = new_d_Proj(dbgi, load, mode,   pn_Load_res);
1472
1473         set_store(load_mem);
1474
1475         ir_mode *const mode_arithmetic = get_ir_mode_arithmetic(skipped);
1476         return create_conv(dbgi, load_res, mode_arithmetic);
1477 }
1478
1479 /**
1480  * Creates a strict Conv (to the node's mode) if necessary.
1481  *
1482  * @param dbgi  debug info
1483  * @param node  the node to strict conv
1484  */
1485 static ir_node *do_strict_conv(dbg_info *dbgi, ir_node *node)
1486 {
1487         ir_mode *mode = get_irn_mode(node);
1488
1489         if (!(get_irg_fp_model(current_ir_graph) & fp_explicit_rounding))
1490                 return node;
1491         if (!mode_is_float(mode))
1492                 return node;
1493
1494         /* check if there is already a Conv */
1495         if (is_Conv(node)) {
1496                 /* convert it into a strict Conv */
1497                 set_Conv_strict(node, 1);
1498                 return node;
1499         }
1500
1501         /* otherwise create a new one */
1502         return new_d_strictConv(dbgi, node, mode);
1503 }
1504
1505 /**
1506  * Returns the correct base address depending on whether it is a parameter or a
1507  * normal local variable.
1508  */
1509 static ir_node *get_local_frame(ir_entity *const ent)
1510 {
1511         ir_graph      *const irg   = current_ir_graph;
1512         const ir_type *const owner = get_entity_owner(ent);
1513         if (owner == current_outer_frame) {
1514                 assert(current_static_link != NULL);
1515                 return current_static_link;
1516         } else {
1517                 return get_irg_frame(irg);
1518         }
1519 }
1520
1521 /**
1522  * Keep all memory edges of the given block.
1523  */
1524 static void keep_all_memory(ir_node *block)
1525 {
1526         ir_node *old = get_cur_block();
1527
1528         set_cur_block(block);
1529         keep_alive(get_store());
1530         /* TODO: keep all memory edges from restricted pointers */
1531         set_cur_block(old);
1532 }
1533
1534 static ir_node *enum_constant_to_firm(reference_expression_t const *const ref)
1535 {
1536         entity_t *entity = ref->entity;
1537         if (entity->enum_value.tv == NULL) {
1538                 type_t *type = skip_typeref(entity->enum_value.enum_type);
1539                 assert(type->kind == TYPE_ENUM);
1540                 determine_enum_values(&type->enumt);
1541         }
1542
1543         return new_Const(entity->enum_value.tv);
1544 }
1545
1546 static ir_node *reference_expression_to_firm(const reference_expression_t *ref)
1547 {
1548         dbg_info *dbgi   = get_dbg_info(&ref->base.source_position);
1549         entity_t *entity = ref->entity;
1550         assert(is_declaration(entity));
1551         type_t   *type   = skip_typeref(entity->declaration.type);
1552
1553         /* make sure the type is constructed */
1554         (void) get_ir_type(type);
1555
1556         if (entity->kind == ENTITY_FUNCTION
1557             && entity->function.btk != BUILTIN_NONE) {
1558                 ir_entity *irentity = get_function_entity(entity, NULL);
1559                 /* for gcc compatibility we have to produce (dummy) addresses for some
1560                  * builtins which don't have entities */
1561                 if (irentity == NULL) {
1562                         source_position_t const *const pos = &ref->base.source_position;
1563                         symbol_t          const *const sym = ref->entity->base.symbol;
1564                         warningf(WARN_OTHER, pos, "taking address of builtin '%Y'", sym);
1565
1566                         /* simply create a NULL pointer */
1567                         ir_mode  *mode = get_ir_mode_arithmetic(type_void_ptr);
1568                         ir_node  *res  = new_Const(get_mode_null(mode));
1569
1570                         return res;
1571                 }
1572         }
1573
1574         switch ((declaration_kind_t) entity->declaration.kind) {
1575         case DECLARATION_KIND_UNKNOWN:
1576                 break;
1577
1578         case DECLARATION_KIND_LOCAL_VARIABLE: {
1579                 ir_mode *const mode  = get_ir_mode_storage(type);
1580                 ir_node *const value = get_value(entity->variable.v.value_number, mode);
1581                 return create_conv(NULL, value, get_ir_mode_arithmetic(type));
1582         }
1583         case DECLARATION_KIND_PARAMETER: {
1584                 ir_mode *const mode  = get_ir_mode_storage(type);
1585                 ir_node *const value = get_value(entity->parameter.v.value_number,mode);
1586                 return create_conv(NULL, value, get_ir_mode_arithmetic(type));
1587         }
1588         case DECLARATION_KIND_FUNCTION: {
1589                 return create_symconst(dbgi, entity->function.irentity);
1590         }
1591         case DECLARATION_KIND_INNER_FUNCTION: {
1592                 ir_mode *const mode = get_ir_mode_storage(type);
1593                 if (!entity->function.goto_to_outer && !entity->function.need_closure) {
1594                         /* inner function not using the closure */
1595                         return create_symconst(dbgi, entity->function.irentity);
1596                 } else {
1597                         /* need trampoline here */
1598                         return create_trampoline(dbgi, mode, entity->function.irentity);
1599                 }
1600         }
1601         case DECLARATION_KIND_GLOBAL_VARIABLE: {
1602                 const variable_t *variable = &entity->variable;
1603                 ir_node *const addr = create_symconst(dbgi, variable->v.entity);
1604                 return deref_address(dbgi, variable->base.type, addr);
1605         }
1606
1607         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY: {
1608                 ir_entity *irentity = entity->variable.v.entity;
1609                 ir_node   *frame    = get_local_frame(irentity);
1610                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1611                 return deref_address(dbgi, entity->declaration.type, sel);
1612         }
1613         case DECLARATION_KIND_PARAMETER_ENTITY: {
1614                 ir_entity *irentity = entity->parameter.v.entity;
1615                 ir_node   *frame    = get_local_frame(irentity);
1616                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1617                 return deref_address(dbgi, entity->declaration.type, sel);
1618         }
1619
1620         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
1621                 return entity->variable.v.vla_base;
1622
1623         case DECLARATION_KIND_COMPOUND_MEMBER:
1624                 panic("not implemented reference type");
1625         }
1626
1627         panic("reference to declaration with unknown type found");
1628 }
1629
1630 static ir_node *reference_addr(const reference_expression_t *ref)
1631 {
1632         dbg_info *dbgi   = get_dbg_info(&ref->base.source_position);
1633         entity_t *entity = ref->entity;
1634         assert(is_declaration(entity));
1635
1636         switch((declaration_kind_t) entity->declaration.kind) {
1637         case DECLARATION_KIND_UNKNOWN:
1638                 break;
1639         case DECLARATION_KIND_PARAMETER:
1640         case DECLARATION_KIND_LOCAL_VARIABLE:
1641                 /* you can store to a local variable (so we don't panic but return NULL
1642                  * as an indicator for no real address) */
1643                 return NULL;
1644         case DECLARATION_KIND_GLOBAL_VARIABLE: {
1645                 ir_node *const addr = create_symconst(dbgi, entity->variable.v.entity);
1646                 return addr;
1647         }
1648         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY: {
1649                 ir_entity *irentity = entity->variable.v.entity;
1650                 ir_node   *frame    = get_local_frame(irentity);
1651                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1652
1653                 return sel;
1654         }
1655         case DECLARATION_KIND_PARAMETER_ENTITY: {
1656                 ir_entity *irentity = entity->parameter.v.entity;
1657                 ir_node   *frame    = get_local_frame(irentity);
1658                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1659
1660                 return sel;
1661         }
1662
1663         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
1664                 return entity->variable.v.vla_base;
1665
1666         case DECLARATION_KIND_FUNCTION: {
1667                 return create_symconst(dbgi, entity->function.irentity);
1668         }
1669
1670         case DECLARATION_KIND_INNER_FUNCTION: {
1671                 type_t  *const type = skip_typeref(entity->declaration.type);
1672                 ir_mode *const mode = get_ir_mode_storage(type);
1673                 if (!entity->function.goto_to_outer && !entity->function.need_closure) {
1674                         /* inner function not using the closure */
1675                         return create_symconst(dbgi, entity->function.irentity);
1676                 } else {
1677                         /* need trampoline here */
1678                         return create_trampoline(dbgi, mode, entity->function.irentity);
1679                 }
1680         }
1681
1682         case DECLARATION_KIND_COMPOUND_MEMBER:
1683                 panic("not implemented reference type");
1684         }
1685
1686         panic("reference to declaration with unknown type found");
1687 }
1688
1689 /**
1690  * Transform calls to builtin functions.
1691  */
1692 static ir_node *process_builtin_call(const call_expression_t *call)
1693 {
1694         dbg_info *dbgi = get_dbg_info(&call->base.source_position);
1695
1696         assert(call->function->kind == EXPR_REFERENCE);
1697         reference_expression_t *builtin = &call->function->reference;
1698
1699         type_t *expr_type = skip_typeref(builtin->base.type);
1700         assert(is_type_pointer(expr_type));
1701
1702         type_t *function_type = skip_typeref(expr_type->pointer.points_to);
1703
1704         switch (builtin->entity->function.btk) {
1705         case BUILTIN_NONE:
1706                 break;
1707         case BUILTIN_ALLOCA: {
1708                 expression_t *argument = call->arguments->expression;
1709                 ir_node      *size     = expression_to_firm(argument);
1710
1711                 ir_node *store  = get_store();
1712                 ir_node *alloca = new_d_Alloc(dbgi, store, size, get_unknown_type(),
1713                                               stack_alloc);
1714                 ir_node *proj_m = new_Proj(alloca, mode_M, pn_Alloc_M);
1715                 set_store(proj_m);
1716                 ir_node *res    = new_Proj(alloca, mode_P_data, pn_Alloc_res);
1717
1718                 return res;
1719         }
1720         case BUILTIN_INF: {
1721                 type_t    *type = function_type->function.return_type;
1722                 ir_mode   *mode = get_ir_mode_arithmetic(type);
1723                 ir_tarval *tv   = get_mode_infinite(mode);
1724                 ir_node   *res  = new_d_Const(dbgi, tv);
1725                 return res;
1726         }
1727         case BUILTIN_NAN: {
1728                 /* Ignore string for now... */
1729                 assert(is_type_function(function_type));
1730                 type_t    *type = function_type->function.return_type;
1731                 ir_mode   *mode = get_ir_mode_arithmetic(type);
1732                 ir_tarval *tv   = get_mode_NAN(mode);
1733                 ir_node   *res  = new_d_Const(dbgi, tv);
1734                 return res;
1735         }
1736         case BUILTIN_EXPECT: {
1737                 expression_t *argument = call->arguments->expression;
1738                 return _expression_to_firm(argument);
1739         }
1740         case BUILTIN_VA_END:
1741                 /* evaluate the argument of va_end for its side effects */
1742                 _expression_to_firm(call->arguments->expression);
1743                 return NULL;
1744         case BUILTIN_OBJECT_SIZE: {
1745                 /* determine value of "type" */
1746                 expression_t *type_expression = call->arguments->next->expression;
1747                 long          type_val        = fold_constant_to_int(type_expression);
1748                 type_t       *type            = function_type->function.return_type;
1749                 ir_mode      *mode            = get_ir_mode_arithmetic(type);
1750                 /* just produce a "I don't know" result */
1751                 ir_tarval    *result          = type_val & 2 ? get_mode_null(mode) :
1752                                                 get_mode_minus_one(mode);
1753
1754                 return new_d_Const(dbgi, result);
1755         }
1756         case BUILTIN_ROTL: {
1757                 ir_node *val  = expression_to_firm(call->arguments->expression);
1758                 ir_node *shf  = expression_to_firm(call->arguments->next->expression);
1759                 ir_mode *mode = get_irn_mode(val);
1760                 ir_mode *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1761                 return new_d_Rotl(dbgi, val, create_conv(dbgi, shf, mode_uint), mode);
1762         }
1763         case BUILTIN_ROTR: {
1764                 ir_node *val  = expression_to_firm(call->arguments->expression);
1765                 ir_node *shf  = expression_to_firm(call->arguments->next->expression);
1766                 ir_mode *mode = get_irn_mode(val);
1767                 ir_mode *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1768                 ir_node *c    = new_Const_long(mode_uint, get_mode_size_bits(mode));
1769                 ir_node *sub  = new_d_Sub(dbgi, c, create_conv(dbgi, shf, mode_uint), mode_uint);
1770                 return new_d_Rotl(dbgi, val, sub, mode);
1771         }
1772         case BUILTIN_FIRM:
1773                 break;
1774         case BUILTIN_LIBC:
1775         case BUILTIN_LIBC_CHECK:
1776                 panic("builtin did not produce an entity");
1777         }
1778         panic("invalid builtin found");
1779 }
1780
1781 /**
1782  * Transform a call expression.
1783  * Handles some special cases, like alloca() calls, which must be resolved
1784  * BEFORE the inlines runs. Inlining routines calling alloca() is dangerous,
1785  * 176.gcc for instance might allocate 2GB instead of 256 MB if alloca is not
1786  * handled right...
1787  */
1788 static ir_node *call_expression_to_firm(const call_expression_t *const call)
1789 {
1790         dbg_info *const dbgi = get_dbg_info(&call->base.source_position);
1791         assert(currently_reachable());
1792
1793         expression_t   *function = call->function;
1794         ir_node        *callee   = NULL;
1795         bool            firm_builtin = false;
1796         ir_builtin_kind firm_builtin_kind = ir_bk_trap;
1797         if (function->kind == EXPR_REFERENCE) {
1798                 const reference_expression_t *ref    = &function->reference;
1799                 entity_t                     *entity = ref->entity;
1800
1801                 if (entity->kind == ENTITY_FUNCTION) {
1802                         builtin_kind_t builtin = entity->function.btk;
1803                         if (builtin == BUILTIN_FIRM) {
1804                                 firm_builtin = true;
1805                                 firm_builtin_kind = entity->function.b.firm_builtin_kind;
1806                         } else if (builtin != BUILTIN_NONE && builtin != BUILTIN_LIBC
1807                                    && builtin != BUILTIN_LIBC_CHECK) {
1808                                 return process_builtin_call(call);
1809                         }
1810                 }
1811         }
1812         if (!firm_builtin)
1813                 callee = expression_to_firm(function);
1814
1815         type_t *type = skip_typeref(function->base.type);
1816         assert(is_type_pointer(type));
1817         pointer_type_t *pointer_type = &type->pointer;
1818         type_t         *points_to    = skip_typeref(pointer_type->points_to);
1819         assert(is_type_function(points_to));
1820         function_type_t *function_type = &points_to->function;
1821
1822         int      n_parameters    = 0;
1823         ir_type *ir_method_type  = get_ir_type((type_t*) function_type);
1824         ir_type *new_method_type = NULL;
1825         if (function_type->variadic || function_type->unspecified_parameters) {
1826                 const call_argument_t *argument = call->arguments;
1827                 for ( ; argument != NULL; argument = argument->next) {
1828                         ++n_parameters;
1829                 }
1830
1831                 /* we need to construct a new method type matching the call
1832                  * arguments... */
1833                 type_dbg_info *tdbgi = get_type_dbg_info_((const type_t*) function_type);
1834                 int n_res       = get_method_n_ress(ir_method_type);
1835                 new_method_type = new_d_type_method(n_parameters, n_res, tdbgi);
1836                 set_method_calling_convention(new_method_type,
1837                                get_method_calling_convention(ir_method_type));
1838                 set_method_additional_properties(new_method_type,
1839                                get_method_additional_properties(ir_method_type));
1840                 set_method_variadicity(new_method_type,
1841                                        get_method_variadicity(ir_method_type));
1842
1843                 for (int i = 0; i < n_res; ++i) {
1844                         set_method_res_type(new_method_type, i,
1845                                             get_method_res_type(ir_method_type, i));
1846                 }
1847                 argument = call->arguments;
1848                 for (int i = 0; i < n_parameters; ++i, argument = argument->next) {
1849                         expression_t *expression = argument->expression;
1850                         ir_type      *irtype     = get_ir_type(expression->base.type);
1851                         set_method_param_type(new_method_type, i, irtype);
1852                 }
1853                 ir_method_type = new_method_type;
1854         } else {
1855                 n_parameters = get_method_n_params(ir_method_type);
1856         }
1857
1858         ir_node *in[n_parameters];
1859
1860         const call_argument_t *argument = call->arguments;
1861         for (int n = 0; n < n_parameters; ++n) {
1862                 expression_t *expression = argument->expression;
1863                 ir_node      *arg_node   = expression_to_firm(expression);
1864
1865                 type_t *arg_type = skip_typeref(expression->base.type);
1866                 if (!is_type_compound(arg_type)) {
1867                         ir_mode *mode = get_ir_mode_storage(expression->base.type);
1868                         arg_node      = create_conv(dbgi, arg_node, mode);
1869                         arg_node      = do_strict_conv(dbgi, arg_node);
1870                 }
1871
1872                 in[n] = arg_node;
1873
1874                 argument = argument->next;
1875         }
1876
1877         ir_node *store;
1878         if (function_type->modifiers & DM_CONST) {
1879                 store = get_irg_no_mem(current_ir_graph);
1880         } else {
1881                 store = get_store();
1882         }
1883
1884         ir_node *node;
1885         type_t  *return_type = skip_typeref(function_type->return_type);
1886         ir_node *result      = NULL;
1887         if (firm_builtin) {
1888                 node = new_d_Builtin(dbgi, store, n_parameters, in, firm_builtin_kind,
1889                                      ir_method_type);
1890                 if (! (function_type->modifiers & DM_CONST)) {
1891                         ir_node *mem = new_Proj(node, mode_M, pn_Builtin_M);
1892                         set_store(mem);
1893                 }
1894
1895                 if (!is_type_void(return_type)) {
1896                         assert(is_type_scalar(return_type));
1897                         ir_mode *mode = get_ir_mode_storage(return_type);
1898                         result = new_Proj(node, mode, pn_Builtin_max+1);
1899                         ir_mode *mode_arith = get_ir_mode_arithmetic(return_type);
1900                         result              = create_conv(NULL, result, mode_arith);
1901                 }
1902         } else {
1903                 node = new_d_Call(dbgi, store, callee, n_parameters, in, ir_method_type);
1904                 if (! (function_type->modifiers & DM_CONST)) {
1905                         ir_node *mem = new_Proj(node, mode_M, pn_Call_M);
1906                         set_store(mem);
1907                 }
1908
1909                 if (!is_type_void(return_type)) {
1910                         ir_node *resproj = new_Proj(node, mode_T, pn_Call_T_result);
1911
1912                         if (is_type_scalar(return_type)) {
1913                                 ir_mode *mode       = get_ir_mode_storage(return_type);
1914                                 result              = new_Proj(resproj, mode, 0);
1915                                 ir_mode *mode_arith = get_ir_mode_arithmetic(return_type);
1916                                 result              = create_conv(NULL, result, mode_arith);
1917                         } else {
1918                                 ir_mode *mode = mode_P_data;
1919                                 result        = new_Proj(resproj, mode, 0);
1920                         }
1921                 }
1922         }
1923
1924         if (function_type->modifiers & DM_NORETURN) {
1925                 /* A dead end:  Keep the Call and the Block.  Also place all further
1926                  * nodes into a new and unreachable block. */
1927                 keep_alive(node);
1928                 keep_alive(get_cur_block());
1929                 ir_node *block = new_Block(0, NULL);
1930                 set_cur_block(block);
1931         }
1932
1933         return result;
1934 }
1935
1936 static ir_node *statement_to_firm(statement_t *statement);
1937 static ir_node *compound_statement_to_firm(compound_statement_t *compound);
1938
1939 static ir_node *expression_to_addr(const expression_t *expression);
1940 static ir_node *create_condition_evaluation(const expression_t *expression,
1941                                             ir_node *true_block,
1942                                             ir_node *false_block);
1943
1944 static void assign_value(dbg_info *dbgi, ir_node *addr, type_t *type,
1945                          ir_node *value)
1946 {
1947         if (!is_type_compound(type)) {
1948                 ir_mode *mode = get_ir_mode_storage(type);
1949                 value         = create_conv(dbgi, value, mode);
1950                 value         = do_strict_conv(dbgi, value);
1951         }
1952
1953         ir_node *memory = get_store();
1954
1955         if (is_type_scalar(type)) {
1956                 ir_cons_flags flags = type->base.qualifiers & TYPE_QUALIFIER_VOLATILE
1957                                       ? cons_volatile : cons_none;
1958                 ir_node  *store     = new_d_Store(dbgi, memory, addr, value, flags);
1959                 ir_node  *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
1960                 set_store(store_mem);
1961         } else {
1962                 ir_type *irtype    = get_ir_type(type);
1963                 ir_node *copyb     = new_d_CopyB(dbgi, memory, addr, value, irtype);
1964                 ir_node *copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
1965                 set_store(copyb_mem);
1966         }
1967 }
1968
1969 static ir_tarval *create_bitfield_mask(ir_mode *mode, int offset, int size)
1970 {
1971         ir_tarval *all_one   = get_mode_all_one(mode);
1972         int        mode_size = get_mode_size_bits(mode);
1973         ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1974
1975         assert(offset >= 0);
1976         assert(size   >= 0);
1977         assert(offset + size <= mode_size);
1978         if (size == mode_size) {
1979                 return all_one;
1980         }
1981
1982         long       shiftr    = get_mode_size_bits(mode) - size;
1983         long       shiftl    = offset;
1984         ir_tarval *tv_shiftr = new_tarval_from_long(shiftr, mode_uint);
1985         ir_tarval *tv_shiftl = new_tarval_from_long(shiftl, mode_uint);
1986         ir_tarval *mask0     = tarval_shr(all_one, tv_shiftr);
1987         ir_tarval *mask1     = tarval_shl(mask0, tv_shiftl);
1988
1989         return mask1;
1990 }
1991
1992 static ir_node *bitfield_store_to_firm(dbg_info *dbgi,
1993                 ir_entity *entity, ir_node *addr, ir_node *value, bool set_volatile,
1994                 bool need_return)
1995 {
1996         ir_type *entity_type = get_entity_type(entity);
1997         ir_type *base_type   = get_primitive_base_type(entity_type);
1998         ir_mode *mode        = get_type_mode(base_type);
1999         ir_mode *mode_uint   = atomic_modes[ATOMIC_TYPE_UINT];
2000
2001         value = create_conv(dbgi, value, mode);
2002
2003         /* kill upper bits of value and shift to right position */
2004         unsigned  bitoffset  = get_entity_offset_bits_remainder(entity);
2005         unsigned  bitsize    = get_mode_size_bits(get_type_mode(entity_type));
2006         unsigned  base_bits  = get_mode_size_bits(mode);
2007         unsigned  shiftwidth = base_bits - bitsize;
2008
2009         ir_node  *shiftcount = new_Const_long(mode_uint, shiftwidth);
2010         ir_node  *shiftl     = new_d_Shl(dbgi, value, shiftcount, mode);
2011
2012         unsigned  shrwidth   = base_bits - bitsize - bitoffset;
2013         ir_node  *shrconst   = new_Const_long(mode_uint, shrwidth);
2014         ir_node  *shiftr     = new_d_Shr(dbgi, shiftl, shrconst, mode);
2015
2016         /* load current value */
2017         ir_node   *mem             = get_store();
2018         ir_node   *load            = new_d_Load(dbgi, mem, addr, mode,
2019                                           set_volatile ? cons_volatile : cons_none);
2020         ir_node   *load_mem        = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
2021         ir_node   *load_res        = new_d_Proj(dbgi, load, mode, pn_Load_res);
2022         ir_tarval *shift_mask      = create_bitfield_mask(mode, bitoffset, bitsize);
2023         ir_tarval *inv_mask        = tarval_not(shift_mask);
2024         ir_node   *inv_mask_node   = new_d_Const(dbgi, inv_mask);
2025         ir_node   *load_res_masked = new_d_And(dbgi, load_res, inv_mask_node, mode);
2026
2027         /* construct new value and store */
2028         ir_node *new_val   = new_d_Or(dbgi, load_res_masked, shiftr, mode);
2029         ir_node *store     = new_d_Store(dbgi, load_mem, addr, new_val,
2030                                          set_volatile ? cons_volatile : cons_none);
2031         ir_node *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
2032         set_store(store_mem);
2033
2034         if (!need_return)
2035                 return NULL;
2036
2037         ir_node *res_shr;
2038         ir_node *count_res_shr = new_Const_long(mode_uint, base_bits - bitsize);
2039         if (mode_is_signed(mode)) {
2040                 res_shr = new_d_Shrs(dbgi, shiftl, count_res_shr, mode);
2041         } else {
2042                 res_shr = new_d_Shr(dbgi, shiftl, count_res_shr, mode);
2043         }
2044         return res_shr;
2045 }
2046
2047 static ir_node *bitfield_extract_to_firm(const select_expression_t *expression,
2048                                          ir_node *addr)
2049 {
2050         dbg_info *dbgi      = get_dbg_info(&expression->base.source_position);
2051         entity_t *entity    = expression->compound_entry;
2052         type_t   *base_type = entity->declaration.type;
2053         ir_mode  *mode      = get_ir_mode_storage(base_type);
2054         ir_node  *mem       = get_store();
2055         ir_node  *load      = new_d_Load(dbgi, mem, addr, mode, cons_none);
2056         ir_node  *load_mem  = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
2057         ir_node  *load_res  = new_d_Proj(dbgi, load, mode, pn_Load_res);
2058         ir_mode  *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
2059
2060         ir_mode  *amode     = mode;
2061         /* optimisation, since shifting in modes < machine_size is usually
2062          * less efficient */
2063         if (get_mode_size_bits(amode) < get_mode_size_bits(mode_uint)) {
2064                 amode = mode_uint;
2065         }
2066         unsigned amode_size = get_mode_size_bits(amode);
2067         load_res = create_conv(dbgi, load_res, amode);
2068
2069         set_store(load_mem);
2070
2071         /* kill upper bits */
2072         assert(expression->compound_entry->kind == ENTITY_COMPOUND_MEMBER);
2073         unsigned   bitoffset   = entity->compound_member.bit_offset;
2074         unsigned   bitsize     = entity->compound_member.bit_size;
2075         unsigned   shift_bitsl = amode_size - bitoffset - bitsize;
2076         ir_tarval *tvl         = new_tarval_from_long((long)shift_bitsl, mode_uint);
2077         ir_node   *countl      = new_d_Const(dbgi, tvl);
2078         ir_node   *shiftl      = new_d_Shl(dbgi, load_res, countl, amode);
2079
2080         unsigned   shift_bitsr = bitoffset + shift_bitsl;
2081         assert(shift_bitsr <= amode_size);
2082         ir_tarval *tvr         = new_tarval_from_long((long)shift_bitsr, mode_uint);
2083         ir_node   *countr      = new_d_Const(dbgi, tvr);
2084         ir_node   *shiftr;
2085         if (mode_is_signed(mode)) {
2086                 shiftr = new_d_Shrs(dbgi, shiftl, countr, amode);
2087         } else {
2088                 shiftr = new_d_Shr(dbgi, shiftl, countr, amode);
2089         }
2090
2091         type_t  *type    = expression->base.type;
2092         ir_mode *resmode = get_ir_mode_arithmetic(type);
2093         return create_conv(dbgi, shiftr, resmode);
2094 }
2095
2096 /* make sure the selected compound type is constructed */
2097 static void construct_select_compound(const select_expression_t *expression)
2098 {
2099         type_t *type = skip_typeref(expression->compound->base.type);
2100         if (is_type_pointer(type)) {
2101                 type = type->pointer.points_to;
2102         }
2103         (void) get_ir_type(type);
2104 }
2105
2106 static ir_node *set_value_for_expression_addr(const expression_t *expression,
2107                                               ir_node *value, ir_node *addr)
2108 {
2109         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2110         type_t   *type = skip_typeref(expression->base.type);
2111
2112         if (!is_type_compound(type)) {
2113                 ir_mode  *mode = get_ir_mode_storage(type);
2114                 value          = create_conv(dbgi, value, mode);
2115                 value          = do_strict_conv(dbgi, value);
2116         }
2117
2118         if (expression->kind == EXPR_REFERENCE) {
2119                 const reference_expression_t *ref = &expression->reference;
2120
2121                 entity_t *entity = ref->entity;
2122                 assert(is_declaration(entity));
2123                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2124                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE) {
2125                         set_value(entity->variable.v.value_number, value);
2126                         return value;
2127                 } else if (entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
2128                         set_value(entity->parameter.v.value_number, value);
2129                         return value;
2130                 }
2131         }
2132
2133         if (addr == NULL)
2134                 addr = expression_to_addr(expression);
2135         assert(addr != NULL);
2136
2137         if (expression->kind == EXPR_SELECT) {
2138                 const select_expression_t *select = &expression->select;
2139
2140                 construct_select_compound(select);
2141
2142                 entity_t *entity = select->compound_entry;
2143                 assert(entity->kind == ENTITY_COMPOUND_MEMBER);
2144                 if (entity->compound_member.bitfield) {
2145                         ir_entity *irentity = entity->compound_member.entity;
2146                         bool       set_volatile
2147                                 = select->base.type->base.qualifiers & TYPE_QUALIFIER_VOLATILE;
2148                         value = bitfield_store_to_firm(dbgi, irentity, addr, value,
2149                                                        set_volatile, true);
2150                         return value;
2151                 }
2152         }
2153
2154         assign_value(dbgi, addr, type, value);
2155         return value;
2156 }
2157
2158 static void set_value_for_expression(const expression_t *expression,
2159                                      ir_node *value)
2160 {
2161         set_value_for_expression_addr(expression, value, NULL);
2162 }
2163
2164 static ir_node *get_value_from_lvalue(const expression_t *expression,
2165                                       ir_node *addr)
2166 {
2167         if (expression->kind == EXPR_REFERENCE) {
2168                 const reference_expression_t *ref = &expression->reference;
2169
2170                 entity_t *entity = ref->entity;
2171                 assert(entity->kind == ENTITY_VARIABLE
2172                                 || entity->kind == ENTITY_PARAMETER);
2173                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2174                 int value_number;
2175                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE) {
2176                         value_number = entity->variable.v.value_number;
2177                         assert(addr == NULL);
2178                         type_t  *type = skip_typeref(expression->base.type);
2179                         ir_mode *mode = get_ir_mode_storage(type);
2180                         ir_node *res  = get_value(value_number, mode);
2181                         return create_conv(NULL, res, get_ir_mode_arithmetic(type));
2182                 } else if (entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
2183                         value_number = entity->parameter.v.value_number;
2184                         assert(addr == NULL);
2185                         type_t  *type = skip_typeref(expression->base.type);
2186                         ir_mode *mode = get_ir_mode_storage(type);
2187                         ir_node *res  = get_value(value_number, mode);
2188                         return create_conv(NULL, res, get_ir_mode_arithmetic(type));
2189                 }
2190         }
2191
2192         assert(addr != NULL);
2193         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2194
2195         ir_node *value;
2196         if (expression->kind == EXPR_SELECT &&
2197             expression->select.compound_entry->compound_member.bitfield) {
2198             construct_select_compound(&expression->select);
2199                 value = bitfield_extract_to_firm(&expression->select, addr);
2200         } else {
2201                 value = deref_address(dbgi, expression->base.type, addr);
2202         }
2203
2204         return value;
2205 }
2206
2207
2208 static ir_node *create_incdec(const unary_expression_t *expression)
2209 {
2210         dbg_info *const     dbgi = get_dbg_info(&expression->base.source_position);
2211         const expression_t *value_expr = expression->value;
2212         ir_node            *addr       = expression_to_addr(value_expr);
2213         ir_node            *value      = get_value_from_lvalue(value_expr, addr);
2214
2215         type_t  *type = skip_typeref(expression->base.type);
2216         ir_mode *mode = get_ir_mode_arithmetic(expression->base.type);
2217
2218         ir_node *offset;
2219         if (is_type_pointer(type)) {
2220                 pointer_type_t *pointer_type = &type->pointer;
2221                 offset = get_type_size_node(pointer_type->points_to);
2222         } else {
2223                 assert(is_type_arithmetic(type));
2224                 offset = new_Const(get_mode_one(mode));
2225         }
2226
2227         ir_node *result;
2228         ir_node *store_value;
2229         switch(expression->base.kind) {
2230         case EXPR_UNARY_POSTFIX_INCREMENT:
2231                 result      = value;
2232                 store_value = new_d_Add(dbgi, value, offset, mode);
2233                 break;
2234         case EXPR_UNARY_POSTFIX_DECREMENT:
2235                 result      = value;
2236                 store_value = new_d_Sub(dbgi, value, offset, mode);
2237                 break;
2238         case EXPR_UNARY_PREFIX_INCREMENT:
2239                 result      = new_d_Add(dbgi, value, offset, mode);
2240                 store_value = result;
2241                 break;
2242         case EXPR_UNARY_PREFIX_DECREMENT:
2243                 result      = new_d_Sub(dbgi, value, offset, mode);
2244                 store_value = result;
2245                 break;
2246         default:
2247                 panic("no incdec expr in create_incdec");
2248         }
2249
2250         set_value_for_expression_addr(value_expr, store_value, addr);
2251
2252         return result;
2253 }
2254
2255 static bool is_local_variable(expression_t *expression)
2256 {
2257         if (expression->kind != EXPR_REFERENCE)
2258                 return false;
2259         reference_expression_t *ref_expr = &expression->reference;
2260         entity_t               *entity   = ref_expr->entity;
2261         if (entity->kind != ENTITY_VARIABLE)
2262                 return false;
2263         assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2264         return entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE;
2265 }
2266
2267 static ir_relation get_relation(const expression_kind_t kind)
2268 {
2269         switch(kind) {
2270         case EXPR_BINARY_EQUAL:         return ir_relation_equal;
2271         case EXPR_BINARY_ISLESSGREATER: return ir_relation_less_greater;
2272         case EXPR_BINARY_NOTEQUAL:      return ir_relation_unordered_less_greater;
2273         case EXPR_BINARY_ISLESS:
2274         case EXPR_BINARY_LESS:          return ir_relation_less;
2275         case EXPR_BINARY_ISLESSEQUAL:
2276         case EXPR_BINARY_LESSEQUAL:     return ir_relation_less_equal;
2277         case EXPR_BINARY_ISGREATER:
2278         case EXPR_BINARY_GREATER:       return ir_relation_greater;
2279         case EXPR_BINARY_ISGREATEREQUAL:
2280         case EXPR_BINARY_GREATEREQUAL:  return ir_relation_greater_equal;
2281         case EXPR_BINARY_ISUNORDERED:   return ir_relation_unordered;
2282
2283         default:
2284                 break;
2285         }
2286         panic("trying to get pn_Cmp from non-comparison binexpr type");
2287 }
2288
2289 /**
2290  * Handle the assume optimizer hint: check if a Confirm
2291  * node can be created.
2292  *
2293  * @param dbi    debug info
2294  * @param expr   the IL assume expression
2295  *
2296  * we support here only some simple cases:
2297  *  - var rel const
2298  *  - const rel val
2299  *  - var rel var
2300  */
2301 static ir_node *handle_assume_compare(dbg_info *dbi,
2302                                       const binary_expression_t *expression)
2303 {
2304         expression_t *op1 = expression->left;
2305         expression_t *op2 = expression->right;
2306         entity_t     *var2, *var = NULL;
2307         ir_node      *res      = NULL;
2308         ir_relation   relation = get_relation(expression->base.kind);
2309
2310         if (is_local_variable(op1) && is_local_variable(op2)) {
2311                 var  = op1->reference.entity;
2312             var2 = op2->reference.entity;
2313
2314                 type_t  *const type = skip_typeref(var->declaration.type);
2315                 ir_mode *const mode = get_ir_mode_storage(type);
2316
2317                 ir_node *const irn1 = get_value(var->variable.v.value_number, mode);
2318                 ir_node *const irn2 = get_value(var2->variable.v.value_number, mode);
2319
2320                 res = new_d_Confirm(dbi, irn2, irn1, get_inversed_relation(relation));
2321                 set_value(var2->variable.v.value_number, res);
2322
2323                 res = new_d_Confirm(dbi, irn1, irn2, relation);
2324                 set_value(var->variable.v.value_number, res);
2325
2326                 return res;
2327         }
2328
2329         expression_t *con = NULL;
2330         if (is_local_variable(op1) && is_constant_expression(op2) == EXPR_CLASS_CONSTANT) {
2331                 var = op1->reference.entity;
2332                 con = op2;
2333         } else if (is_constant_expression(op1) == EXPR_CLASS_CONSTANT && is_local_variable(op2)) {
2334                 relation = get_inversed_relation(relation);
2335                 var = op2->reference.entity;
2336                 con = op1;
2337         }
2338
2339         if (var != NULL) {
2340                 type_t  *const type = skip_typeref(var->declaration.type);
2341                 ir_mode *const mode = get_ir_mode_storage(type);
2342
2343                 res = get_value(var->variable.v.value_number, mode);
2344                 res = new_d_Confirm(dbi, res, expression_to_firm(con), relation);
2345                 set_value(var->variable.v.value_number, res);
2346         }
2347         return res;
2348 }
2349
2350 /**
2351  * Handle the assume optimizer hint.
2352  *
2353  * @param dbi    debug info
2354  * @param expr   the IL assume expression
2355  */
2356 static ir_node *handle_assume(dbg_info *dbi, const expression_t *expression)
2357 {
2358         switch(expression->kind) {
2359         case EXPR_BINARY_EQUAL:
2360         case EXPR_BINARY_NOTEQUAL:
2361         case EXPR_BINARY_LESS:
2362         case EXPR_BINARY_LESSEQUAL:
2363         case EXPR_BINARY_GREATER:
2364         case EXPR_BINARY_GREATEREQUAL:
2365                 return handle_assume_compare(dbi, &expression->binary);
2366         default:
2367                 return NULL;
2368         }
2369 }
2370
2371 static ir_node *create_cast(dbg_info *dbgi, ir_node *value_node,
2372                             type_t *from_type, type_t *type)
2373 {
2374         type = skip_typeref(type);
2375         if (type == type_void) {
2376                 /* make sure firm type is constructed */
2377                 (void) get_ir_type(type);
2378                 return NULL;
2379         }
2380         if (!is_type_scalar(type)) {
2381                 /* make sure firm type is constructed */
2382                 (void) get_ir_type(type);
2383                 return value_node;
2384         }
2385
2386         from_type     = skip_typeref(from_type);
2387         ir_mode *mode = get_ir_mode_storage(type);
2388         /* check for conversion from / to __based types */
2389         if (is_type_pointer(type) && is_type_pointer(from_type)) {
2390                 const variable_t *from_var = from_type->pointer.base_variable;
2391                 const variable_t *to_var   = type->pointer.base_variable;
2392                 if (from_var != to_var) {
2393                         if (from_var != NULL) {
2394                                 ir_node *const addr = create_symconst(dbgi, from_var->v.entity);
2395                                 ir_node *const base = deref_address(dbgi, from_var->base.type, addr);
2396                                 value_node = new_d_Add(dbgi, value_node, base, get_ir_mode_storage(from_type));
2397                         }
2398                         if (to_var != NULL) {
2399                                 ir_node *const addr = create_symconst(dbgi, to_var->v.entity);
2400                                 ir_node *const base = deref_address(dbgi, to_var->base.type, addr);
2401                                 value_node = new_d_Sub(dbgi, value_node, base, mode);
2402                         }
2403                 }
2404         }
2405
2406         if (is_type_atomic(type, ATOMIC_TYPE_BOOL)) {
2407                 /* bool adjustments (we save a mode_Bu, but have to temporarily
2408                  * convert to mode_b so we only get a 0/1 value */
2409                 value_node = create_conv(dbgi, value_node, mode_b);
2410         }
2411
2412         ir_mode *mode_arith = get_ir_mode_arithmetic(type);
2413         ir_node *node       = create_conv(dbgi, value_node, mode);
2414         node                = do_strict_conv(dbgi, node);
2415         node                = create_conv(dbgi, node, mode_arith);
2416
2417         return node;
2418 }
2419
2420 static ir_node *unary_expression_to_firm(const unary_expression_t *expression)
2421 {
2422         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2423         type_t   *type = skip_typeref(expression->base.type);
2424
2425         const expression_t *value = expression->value;
2426
2427         switch(expression->base.kind) {
2428         case EXPR_UNARY_TAKE_ADDRESS:
2429                 return expression_to_addr(value);
2430
2431         case EXPR_UNARY_NEGATE: {
2432                 ir_node *value_node = expression_to_firm(value);
2433                 ir_mode *mode       = get_ir_mode_arithmetic(type);
2434                 return new_d_Minus(dbgi, value_node, mode);
2435         }
2436         case EXPR_UNARY_PLUS:
2437                 return expression_to_firm(value);
2438         case EXPR_UNARY_BITWISE_NEGATE: {
2439                 ir_node *value_node = expression_to_firm(value);
2440                 ir_mode *mode       = get_ir_mode_arithmetic(type);
2441                 return new_d_Not(dbgi, value_node, mode);
2442         }
2443         case EXPR_UNARY_NOT: {
2444                 ir_node *value_node = _expression_to_firm(value);
2445                 value_node          = create_conv(dbgi, value_node, mode_b);
2446                 ir_node *res        = new_d_Not(dbgi, value_node, mode_b);
2447                 return res;
2448         }
2449         case EXPR_UNARY_DEREFERENCE: {
2450                 ir_node *value_node = expression_to_firm(value);
2451                 type_t  *value_type = skip_typeref(value->base.type);
2452                 assert(is_type_pointer(value_type));
2453
2454                 /* check for __based */
2455                 const variable_t *const base_var = value_type->pointer.base_variable;
2456                 if (base_var != NULL) {
2457                         ir_node *const addr = create_symconst(dbgi, base_var->v.entity);
2458                         ir_node *const base = deref_address(dbgi, base_var->base.type, addr);
2459                         value_node = new_d_Add(dbgi, value_node, base, get_ir_mode_storage(value_type));
2460                 }
2461                 type_t  *points_to  = value_type->pointer.points_to;
2462                 return deref_address(dbgi, points_to, value_node);
2463         }
2464         case EXPR_UNARY_POSTFIX_INCREMENT:
2465         case EXPR_UNARY_POSTFIX_DECREMENT:
2466         case EXPR_UNARY_PREFIX_INCREMENT:
2467         case EXPR_UNARY_PREFIX_DECREMENT:
2468                 return create_incdec(expression);
2469         case EXPR_UNARY_CAST: {
2470                 ir_node *value_node = expression_to_firm(value);
2471                 type_t  *from_type  = value->base.type;
2472                 return create_cast(dbgi, value_node, from_type, type);
2473         }
2474         case EXPR_UNARY_ASSUME:
2475                 return handle_assume(dbgi, value);
2476
2477         default:
2478                 break;
2479         }
2480         panic("invalid UNEXPR type found");
2481 }
2482
2483 /**
2484  * produces a 0/1 depending of the value of a mode_b node
2485  */
2486 static ir_node *produce_condition_result(const expression_t *expression,
2487                                          ir_mode *mode, dbg_info *dbgi)
2488 {
2489         ir_node *const one_block  = new_immBlock();
2490         ir_node *const zero_block = new_immBlock();
2491         create_condition_evaluation(expression, one_block, zero_block);
2492         mature_immBlock(one_block);
2493         mature_immBlock(zero_block);
2494
2495         ir_node *const jmp_one  = new_rd_Jmp(dbgi, one_block);
2496         ir_node *const jmp_zero = new_rd_Jmp(dbgi, zero_block);
2497         ir_node *const in_cf[2] = { jmp_one, jmp_zero };
2498         ir_node *const block    = new_Block(lengthof(in_cf), in_cf);
2499         set_cur_block(block);
2500
2501         ir_node *const one   = new_Const(get_mode_one(mode));
2502         ir_node *const zero  = new_Const(get_mode_null(mode));
2503         ir_node *const in[2] = { one, zero };
2504         ir_node *const val   = new_d_Phi(dbgi, lengthof(in), in, mode);
2505
2506         return val;
2507 }
2508
2509 static ir_node *adjust_for_pointer_arithmetic(dbg_info *dbgi,
2510                 ir_node *value, type_t *type)
2511 {
2512         ir_mode        *const mode         = get_ir_mode_arithmetic(type_ptrdiff_t);
2513         assert(is_type_pointer(type));
2514         pointer_type_t *const pointer_type = &type->pointer;
2515         type_t         *const points_to    = skip_typeref(pointer_type->points_to);
2516         ir_node        *      elem_size    = get_type_size_node(points_to);
2517         elem_size                          = create_conv(dbgi, elem_size, mode);
2518         value                              = create_conv(dbgi, value,     mode);
2519         ir_node        *const mul          = new_d_Mul(dbgi, value, elem_size, mode);
2520         return mul;
2521 }
2522
2523 static ir_node *create_op(dbg_info *dbgi, const binary_expression_t *expression,
2524                           ir_node *left, ir_node *right)
2525 {
2526         ir_mode  *mode;
2527         type_t   *type_left  = skip_typeref(expression->left->base.type);
2528         type_t   *type_right = skip_typeref(expression->right->base.type);
2529
2530         expression_kind_t kind = expression->base.kind;
2531
2532         switch (kind) {
2533         case EXPR_BINARY_SHIFTLEFT:
2534         case EXPR_BINARY_SHIFTRIGHT:
2535         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2536         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2537                 mode  = get_ir_mode_arithmetic(expression->base.type);
2538                 right = create_conv(dbgi, right, atomic_modes[ATOMIC_TYPE_UINT]);
2539                 break;
2540
2541         case EXPR_BINARY_SUB:
2542                 if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
2543                         const pointer_type_t *const ptr_type = &type_left->pointer;
2544
2545                         mode = get_ir_mode_arithmetic(expression->base.type);
2546                         ir_node *const elem_size = get_type_size_node(ptr_type->points_to);
2547                         ir_node *const conv_size = new_d_Conv(dbgi, elem_size, mode);
2548                         ir_node *const sub       = new_d_Sub(dbgi, left, right, mode);
2549                         ir_node *const no_mem    = new_NoMem();
2550                         ir_node *const div       = new_d_DivRL(dbgi, no_mem, sub, conv_size,
2551                                                                                                    mode, op_pin_state_floats);
2552                         return new_d_Proj(dbgi, div, mode, pn_Div_res);
2553                 }
2554                 /* fallthrough */
2555         case EXPR_BINARY_SUB_ASSIGN:
2556                 if (is_type_pointer(type_left)) {
2557                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2558                         mode  = get_ir_mode_arithmetic(type_left);
2559                         break;
2560                 }
2561                 goto normal_node;
2562
2563         case EXPR_BINARY_ADD:
2564         case EXPR_BINARY_ADD_ASSIGN:
2565                 if (is_type_pointer(type_left)) {
2566                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2567                         mode  = get_ir_mode_arithmetic(type_left);
2568                         break;
2569                 } else if (is_type_pointer(type_right)) {
2570                         left  = adjust_for_pointer_arithmetic(dbgi, left, type_right);
2571                         mode  = get_ir_mode_arithmetic(type_right);
2572                         break;
2573                 }
2574                 goto normal_node;
2575
2576         default:
2577 normal_node:
2578                 mode = get_ir_mode_arithmetic(type_right);
2579                 left = create_conv(dbgi, left, mode);
2580                 break;
2581         }
2582
2583         switch (kind) {
2584         case EXPR_BINARY_ADD_ASSIGN:
2585         case EXPR_BINARY_ADD:
2586                 return new_d_Add(dbgi, left, right, mode);
2587         case EXPR_BINARY_SUB_ASSIGN:
2588         case EXPR_BINARY_SUB:
2589                 return new_d_Sub(dbgi, left, right, mode);
2590         case EXPR_BINARY_MUL_ASSIGN:
2591         case EXPR_BINARY_MUL:
2592                 return new_d_Mul(dbgi, left, right, mode);
2593         case EXPR_BINARY_BITWISE_AND:
2594         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2595                 return new_d_And(dbgi, left, right, mode);
2596         case EXPR_BINARY_BITWISE_OR:
2597         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2598                 return new_d_Or(dbgi, left, right, mode);
2599         case EXPR_BINARY_BITWISE_XOR:
2600         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2601                 return new_d_Eor(dbgi, left, right, mode);
2602         case EXPR_BINARY_SHIFTLEFT:
2603         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2604                 return new_d_Shl(dbgi, left, right, mode);
2605         case EXPR_BINARY_SHIFTRIGHT:
2606         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2607                 if (mode_is_signed(mode)) {
2608                         return new_d_Shrs(dbgi, left, right, mode);
2609                 } else {
2610                         return new_d_Shr(dbgi, left, right, mode);
2611                 }
2612         case EXPR_BINARY_DIV:
2613         case EXPR_BINARY_DIV_ASSIGN: {
2614                 ir_node *pin = new_Pin(new_NoMem());
2615                 ir_node *op  = new_d_Div(dbgi, pin, left, right, mode,
2616                                          op_pin_state_floats);
2617                 ir_node *res = new_d_Proj(dbgi, op, mode, pn_Div_res);
2618                 return res;
2619         }
2620         case EXPR_BINARY_MOD:
2621         case EXPR_BINARY_MOD_ASSIGN: {
2622                 ir_node *pin = new_Pin(new_NoMem());
2623                 assert(!mode_is_float(mode));
2624                 ir_node *op  = new_d_Mod(dbgi, pin, left, right, mode,
2625                                          op_pin_state_floats);
2626                 ir_node *res = new_d_Proj(dbgi, op, mode, pn_Mod_res);
2627                 return res;
2628         }
2629         default:
2630                 panic("unexpected expression kind");
2631         }
2632 }
2633
2634 static ir_node *create_lazy_op(const binary_expression_t *expression)
2635 {
2636         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2637         type_t   *type = skip_typeref(expression->base.type);
2638         ir_mode  *mode = get_ir_mode_arithmetic(type);
2639
2640         if (is_constant_expression(expression->left) == EXPR_CLASS_CONSTANT) {
2641                 bool val = fold_constant_to_bool(expression->left);
2642                 expression_kind_t ekind = expression->base.kind;
2643                 assert(ekind == EXPR_BINARY_LOGICAL_AND || ekind == EXPR_BINARY_LOGICAL_OR);
2644                 if (ekind == EXPR_BINARY_LOGICAL_AND) {
2645                         if (!val) {
2646                                 return new_Const(get_mode_null(mode));
2647                         }
2648                 } else {
2649                         if (val) {
2650                                 return new_Const(get_mode_one(mode));
2651                         }
2652                 }
2653
2654                 if (is_constant_expression(expression->right) == EXPR_CLASS_CONSTANT) {
2655                         bool valr = fold_constant_to_bool(expression->right);
2656                         return create_Const_from_bool(mode, valr);
2657                 }
2658
2659                 return produce_condition_result(expression->right, mode, dbgi);
2660         }
2661
2662         return produce_condition_result((const expression_t*) expression, mode,
2663                                         dbgi);
2664 }
2665
2666 typedef ir_node * (*create_arithmetic_func)(dbg_info *dbgi, ir_node *left,
2667                                             ir_node *right, ir_mode *mode);
2668
2669 static ir_node *create_assign_binop(const binary_expression_t *expression)
2670 {
2671         dbg_info *const     dbgi = get_dbg_info(&expression->base.source_position);
2672         const expression_t *left_expr = expression->left;
2673         type_t             *type      = skip_typeref(left_expr->base.type);
2674         ir_node            *right     = expression_to_firm(expression->right);
2675         ir_node            *left_addr = expression_to_addr(left_expr);
2676         ir_node            *left      = get_value_from_lvalue(left_expr, left_addr);
2677         ir_node            *result    = create_op(dbgi, expression, left, right);
2678
2679         result = create_cast(dbgi, result, expression->right->base.type, type);
2680         result = do_strict_conv(dbgi, result);
2681
2682         result = set_value_for_expression_addr(left_expr, result, left_addr);
2683
2684         if (!is_type_compound(type)) {
2685                 ir_mode *mode_arithmetic = get_ir_mode_arithmetic(type);
2686                 result = create_conv(dbgi, result, mode_arithmetic);
2687         }
2688         return result;
2689 }
2690
2691 static ir_node *binary_expression_to_firm(const binary_expression_t *expression)
2692 {
2693         expression_kind_t kind = expression->base.kind;
2694
2695         switch(kind) {
2696         case EXPR_BINARY_EQUAL:
2697         case EXPR_BINARY_NOTEQUAL:
2698         case EXPR_BINARY_LESS:
2699         case EXPR_BINARY_LESSEQUAL:
2700         case EXPR_BINARY_GREATER:
2701         case EXPR_BINARY_GREATEREQUAL:
2702         case EXPR_BINARY_ISGREATER:
2703         case EXPR_BINARY_ISGREATEREQUAL:
2704         case EXPR_BINARY_ISLESS:
2705         case EXPR_BINARY_ISLESSEQUAL:
2706         case EXPR_BINARY_ISLESSGREATER:
2707         case EXPR_BINARY_ISUNORDERED: {
2708                 dbg_info   *dbgi     = get_dbg_info(&expression->base.source_position);
2709                 ir_node    *left     = expression_to_firm(expression->left);
2710                 ir_node    *right    = expression_to_firm(expression->right);
2711                 ir_relation relation = get_relation(kind);
2712                 ir_node    *cmp      = new_d_Cmp(dbgi, left, right, relation);
2713                 return cmp;
2714         }
2715         case EXPR_BINARY_ASSIGN: {
2716                 ir_node *addr  = expression_to_addr(expression->left);
2717                 ir_node *right = expression_to_firm(expression->right);
2718                 ir_node *res
2719                         = set_value_for_expression_addr(expression->left, right, addr);
2720
2721                 type_t  *type            = skip_typeref(expression->base.type);
2722                 if (!is_type_compound(type)) {
2723                         ir_mode *mode_arithmetic = get_ir_mode_arithmetic(type);
2724                         res                      = create_conv(NULL, res, mode_arithmetic);
2725                 }
2726                 return res;
2727         }
2728         case EXPR_BINARY_ADD:
2729         case EXPR_BINARY_SUB:
2730         case EXPR_BINARY_MUL:
2731         case EXPR_BINARY_DIV:
2732         case EXPR_BINARY_MOD:
2733         case EXPR_BINARY_BITWISE_AND:
2734         case EXPR_BINARY_BITWISE_OR:
2735         case EXPR_BINARY_BITWISE_XOR:
2736         case EXPR_BINARY_SHIFTLEFT:
2737         case EXPR_BINARY_SHIFTRIGHT:
2738         {
2739                 dbg_info *dbgi  = get_dbg_info(&expression->base.source_position);
2740                 ir_node  *left  = expression_to_firm(expression->left);
2741                 ir_node  *right = expression_to_firm(expression->right);
2742                 return create_op(dbgi, expression, left, right);
2743         }
2744         case EXPR_BINARY_LOGICAL_AND:
2745         case EXPR_BINARY_LOGICAL_OR:
2746                 return create_lazy_op(expression);
2747         case EXPR_BINARY_COMMA:
2748                 /* create side effects of left side */
2749                 (void) expression_to_firm(expression->left);
2750                 return _expression_to_firm(expression->right);
2751
2752         case EXPR_BINARY_ADD_ASSIGN:
2753         case EXPR_BINARY_SUB_ASSIGN:
2754         case EXPR_BINARY_MUL_ASSIGN:
2755         case EXPR_BINARY_MOD_ASSIGN:
2756         case EXPR_BINARY_DIV_ASSIGN:
2757         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2758         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2759         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2760         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2761         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2762                 return create_assign_binop(expression);
2763         default:
2764                 panic("TODO binexpr type");
2765         }
2766 }
2767
2768 static ir_node *array_access_addr(const array_access_expression_t *expression)
2769 {
2770         dbg_info *dbgi        = get_dbg_info(&expression->base.source_position);
2771         ir_node  *base_addr   = expression_to_firm(expression->array_ref);
2772         ir_node  *offset      = expression_to_firm(expression->index);
2773         type_t   *ref_type    = skip_typeref(expression->array_ref->base.type);
2774         ir_node  *real_offset = adjust_for_pointer_arithmetic(dbgi, offset, ref_type);
2775         ir_node  *result      = new_d_Add(dbgi, base_addr, real_offset, mode_P_data);
2776
2777         return result;
2778 }
2779
2780 static ir_node *array_access_to_firm(
2781                 const array_access_expression_t *expression)
2782 {
2783         dbg_info *dbgi   = get_dbg_info(&expression->base.source_position);
2784         ir_node  *addr   = array_access_addr(expression);
2785         type_t   *type   = revert_automatic_type_conversion(
2786                         (const expression_t*) expression);
2787         type             = skip_typeref(type);
2788
2789         return deref_address(dbgi, type, addr);
2790 }
2791
2792 static long get_offsetof_offset(const offsetof_expression_t *expression)
2793 {
2794         type_t *orig_type = expression->type;
2795         long    offset    = 0;
2796
2797         designator_t *designator = expression->designator;
2798         for ( ; designator != NULL; designator = designator->next) {
2799                 type_t *type = skip_typeref(orig_type);
2800                 /* be sure the type is constructed */
2801                 (void) get_ir_type(type);
2802
2803                 if (designator->symbol != NULL) {
2804                         assert(is_type_compound(type));
2805                         symbol_t *symbol = designator->symbol;
2806
2807                         compound_t *compound = type->compound.compound;
2808                         entity_t   *iter     = compound->members.entities;
2809                         for ( ; iter != NULL; iter = iter->base.next) {
2810                                 if (iter->base.symbol == symbol) {
2811                                         break;
2812                                 }
2813                         }
2814                         assert(iter != NULL);
2815
2816                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
2817                         assert(iter->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
2818                         offset += get_entity_offset(iter->compound_member.entity);
2819
2820                         orig_type = iter->declaration.type;
2821                 } else {
2822                         expression_t *array_index = designator->array_index;
2823                         assert(designator->array_index != NULL);
2824                         assert(is_type_array(type));
2825
2826                         long index         = fold_constant_to_int(array_index);
2827                         ir_type *arr_type  = get_ir_type(type);
2828                         ir_type *elem_type = get_array_element_type(arr_type);
2829                         long     elem_size = get_type_size_bytes(elem_type);
2830
2831                         offset += index * elem_size;
2832
2833                         orig_type = type->array.element_type;
2834                 }
2835         }
2836
2837         return offset;
2838 }
2839
2840 static ir_node *offsetof_to_firm(const offsetof_expression_t *expression)
2841 {
2842         ir_mode   *mode   = get_ir_mode_arithmetic(expression->base.type);
2843         long       offset = get_offsetof_offset(expression);
2844         ir_tarval *tv     = new_tarval_from_long(offset, mode);
2845         dbg_info  *dbgi   = get_dbg_info(&expression->base.source_position);
2846
2847         return new_d_Const(dbgi, tv);
2848 }
2849
2850 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
2851                                      ir_entity *entity, type_t *type);
2852 static ir_initializer_t *create_ir_initializer(
2853                 const initializer_t *initializer, type_t *type);
2854
2855 static ir_entity *create_initializer_entity(dbg_info *dbgi,
2856                                             initializer_t *initializer,
2857                                             type_t *type)
2858 {
2859         /* create the ir_initializer */
2860         ir_graph *const old_current_ir_graph = current_ir_graph;
2861         current_ir_graph = get_const_code_irg();
2862
2863         ir_initializer_t *irinitializer = create_ir_initializer(initializer, type);
2864
2865         assert(current_ir_graph == get_const_code_irg());
2866         current_ir_graph = old_current_ir_graph;
2867
2868         ident     *const id          = id_unique("initializer.%u");
2869         ir_type   *const irtype      = get_ir_type(type);
2870         ir_type   *const global_type = get_glob_type();
2871         ir_entity *const entity      = new_d_entity(global_type, id, irtype, dbgi);
2872         set_entity_ld_ident(entity, id);
2873         set_entity_visibility(entity, ir_visibility_private);
2874         add_entity_linkage(entity, IR_LINKAGE_CONSTANT);
2875         set_entity_initializer(entity, irinitializer);
2876         return entity;
2877 }
2878
2879 static ir_node *compound_literal_addr(compound_literal_expression_t const *const expression)
2880 {
2881         dbg_info      *dbgi        = get_dbg_info(&expression->base.source_position);
2882         type_t        *type        = expression->type;
2883         initializer_t *initializer = expression->initializer;
2884
2885         if (is_constant_initializer(initializer) == EXPR_CLASS_CONSTANT) {
2886                 ir_entity *entity = create_initializer_entity(dbgi, initializer, type);
2887                 return create_symconst(dbgi, entity);
2888         } else {
2889                 /* create an entity on the stack */
2890                 ident   *const id     = id_unique("CompLit.%u");
2891                 ir_type *const irtype = get_ir_type(type);
2892                 ir_type *frame_type   = get_irg_frame_type(current_ir_graph);
2893
2894                 ir_entity *const entity = new_d_entity(frame_type, id, irtype, dbgi);
2895                 set_entity_ld_ident(entity, id);
2896
2897                 /* create initialisation code */
2898                 create_local_initializer(initializer, dbgi, entity, type);
2899
2900                 /* create a sel for the compound literal address */
2901                 ir_node *frame = get_irg_frame(current_ir_graph);
2902                 ir_node *sel   = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
2903                 return sel;
2904         }
2905 }
2906
2907 static ir_node *compound_literal_to_firm(compound_literal_expression_t const* const expr)
2908 {
2909         dbg_info *const dbgi = get_dbg_info(&expr->base.source_position);
2910         type_t   *const type = expr->type;
2911         ir_node  *const addr = compound_literal_addr(expr);
2912         return deref_address(dbgi, type, addr);
2913 }
2914
2915 /**
2916  * Transform a sizeof expression into Firm code.
2917  */
2918 static ir_node *sizeof_to_firm(const typeprop_expression_t *expression)
2919 {
2920         type_t *const type = skip_typeref(expression->type);
2921         /* §6.5.3.4:2 if the type is a VLA, evaluate the expression. */
2922         if (is_type_array(type) && type->array.is_vla
2923                         && expression->tp_expression != NULL) {
2924                 expression_to_firm(expression->tp_expression);
2925         }
2926         /* strange gnu extensions: sizeof(function) == 1 */
2927         if (is_type_function(type)) {
2928                 ir_mode *mode = get_ir_mode_storage(type_size_t);
2929                 return new_Const(get_mode_one(mode));
2930         }
2931
2932         return get_type_size_node(type);
2933 }
2934
2935 static entity_t *get_expression_entity(const expression_t *expression)
2936 {
2937         if (expression->kind != EXPR_REFERENCE)
2938                 return NULL;
2939
2940         return expression->reference.entity;
2941 }
2942
2943 static unsigned get_cparser_entity_alignment(const entity_t *entity)
2944 {
2945         switch(entity->kind) {
2946         case DECLARATION_KIND_CASES:
2947                 return entity->declaration.alignment;
2948         case ENTITY_STRUCT:
2949         case ENTITY_UNION:
2950                 return entity->compound.alignment;
2951         case ENTITY_TYPEDEF:
2952                 return entity->typedefe.alignment;
2953         default:
2954                 break;
2955         }
2956         return 0;
2957 }
2958
2959 /**
2960  * Transform an alignof expression into Firm code.
2961  */
2962 static ir_node *alignof_to_firm(const typeprop_expression_t *expression)
2963 {
2964         unsigned alignment = 0;
2965
2966         const expression_t *tp_expression = expression->tp_expression;
2967         if (tp_expression != NULL) {
2968                 entity_t *entity = get_expression_entity(tp_expression);
2969                 if (entity != NULL) {
2970                         if (entity->kind == ENTITY_FUNCTION) {
2971                                 /* a gnu-extension */
2972                                 alignment = 1;
2973                         } else {
2974                                 alignment = get_cparser_entity_alignment(entity);
2975                         }
2976                 }
2977         }
2978
2979         if (alignment == 0) {
2980                 type_t *type = expression->type;
2981                 alignment = get_type_alignment(type);
2982         }
2983
2984         dbg_info  *dbgi = get_dbg_info(&expression->base.source_position);
2985         ir_mode   *mode = get_ir_mode_arithmetic(expression->base.type);
2986         ir_tarval *tv   = new_tarval_from_long(alignment, mode);
2987         return new_d_Const(dbgi, tv);
2988 }
2989
2990 static void init_ir_types(void);
2991
2992 static ir_tarval *fold_constant_to_tarval(const expression_t *expression)
2993 {
2994         assert(is_constant_expression(expression) == EXPR_CLASS_CONSTANT);
2995
2996         bool constant_folding_old = constant_folding;
2997         constant_folding = true;
2998         int old_optimize         = get_optimize();
2999         int old_constant_folding = get_opt_constant_folding();
3000         set_optimize(1);
3001         set_opt_constant_folding(1);
3002
3003         init_ir_types();
3004
3005         ir_graph *old_current_ir_graph = current_ir_graph;
3006         current_ir_graph = get_const_code_irg();
3007
3008         ir_node *cnst = expression_to_firm(expression);
3009         current_ir_graph = old_current_ir_graph;
3010         set_optimize(old_optimize);
3011         set_opt_constant_folding(old_constant_folding);
3012
3013         if (!is_Const(cnst)) {
3014                 panic("couldn't fold constant");
3015         }
3016
3017         constant_folding = constant_folding_old;
3018
3019         return get_Const_tarval(cnst);
3020 }
3021
3022 /* this function is only used in parser.c, but it relies on libfirm functionality */
3023 bool constant_is_negative(const expression_t *expression)
3024 {
3025         ir_tarval *tv = fold_constant_to_tarval(expression);
3026         return tarval_is_negative(tv);
3027 }
3028
3029 long fold_constant_to_int(const expression_t *expression)
3030 {
3031         ir_tarval *tv = fold_constant_to_tarval(expression);
3032         if (!tarval_is_long(tv)) {
3033                 panic("result of constant folding is not integer");
3034         }
3035
3036         return get_tarval_long(tv);
3037 }
3038
3039 bool fold_constant_to_bool(const expression_t *expression)
3040 {
3041         ir_tarval *tv = fold_constant_to_tarval(expression);
3042         return !tarval_is_null(tv);
3043 }
3044
3045 static ir_node *conditional_to_firm(const conditional_expression_t *expression)
3046 {
3047         dbg_info *const dbgi = get_dbg_info(&expression->base.source_position);
3048
3049         /* first try to fold a constant condition */
3050         if (is_constant_expression(expression->condition) == EXPR_CLASS_CONSTANT) {
3051                 bool val = fold_constant_to_bool(expression->condition);
3052                 if (val) {
3053                         expression_t *true_expression = expression->true_expression;
3054                         if (true_expression == NULL)
3055                                 true_expression = expression->condition;
3056                         return expression_to_firm(true_expression);
3057                 } else {
3058                         return expression_to_firm(expression->false_expression);
3059                 }
3060         }
3061
3062         ir_node *const true_block  = new_immBlock();
3063         ir_node *const false_block = new_immBlock();
3064         ir_node *const cond_expr   = create_condition_evaluation(expression->condition, true_block, false_block);
3065         mature_immBlock(true_block);
3066         mature_immBlock(false_block);
3067
3068         set_cur_block(true_block);
3069         ir_node *true_val;
3070         if (expression->true_expression != NULL) {
3071                 true_val = expression_to_firm(expression->true_expression);
3072         } else if (cond_expr != NULL && get_irn_mode(cond_expr) != mode_b) {
3073                 true_val = cond_expr;
3074         } else {
3075                 /* Condition ended with a short circuit (&&, ||, !) operation or a
3076                  * comparison.  Generate a "1" as value for the true branch. */
3077                 true_val = new_Const(get_mode_one(mode_Is));
3078         }
3079         ir_node *const true_jmp = new_d_Jmp(dbgi);
3080
3081         set_cur_block(false_block);
3082         ir_node *const false_val = expression_to_firm(expression->false_expression);
3083         ir_node *const false_jmp = new_d_Jmp(dbgi);
3084
3085         /* create the common block */
3086         ir_node *const in_cf[2] = { true_jmp, false_jmp };
3087         ir_node *const block    = new_Block(lengthof(in_cf), in_cf);
3088         set_cur_block(block);
3089
3090         /* TODO improve static semantics, so either both or no values are NULL */
3091         if (true_val == NULL || false_val == NULL)
3092                 return NULL;
3093
3094         ir_node *const in[2] = { true_val, false_val };
3095         type_t  *const type  = skip_typeref(expression->base.type);
3096         ir_mode *mode;
3097         if (is_type_compound(type)) {
3098                 mode = mode_P;
3099         } else {
3100                 mode = get_ir_mode_arithmetic(type);
3101         }
3102         ir_node *const val   = new_d_Phi(dbgi, lengthof(in), in, mode);
3103
3104         return val;
3105 }
3106
3107 /**
3108  * Returns an IR-node representing the address of a field.
3109  */
3110 static ir_node *select_addr(const select_expression_t *expression)
3111 {
3112         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3113
3114         construct_select_compound(expression);
3115
3116         ir_node *compound_addr = expression_to_firm(expression->compound);
3117
3118         entity_t *entry = expression->compound_entry;
3119         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3120         assert(entry->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
3121
3122         if (constant_folding) {
3123                 ir_mode *mode      = get_irn_mode(compound_addr);
3124                 ir_mode *mode_uint = get_reference_mode_unsigned_eq(mode);
3125                 ir_node *ofs       = new_Const_long(mode_uint, entry->compound_member.offset);
3126                 return new_d_Add(dbgi, compound_addr, ofs, mode);
3127         } else {
3128                 ir_entity *irentity = entry->compound_member.entity;
3129                 assert(irentity != NULL);
3130                 return new_d_simpleSel(dbgi, new_NoMem(), compound_addr, irentity);
3131         }
3132 }
3133
3134 static ir_node *select_to_firm(const select_expression_t *expression)
3135 {
3136         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3137         ir_node  *addr = select_addr(expression);
3138         type_t   *type = revert_automatic_type_conversion(
3139                         (const expression_t*) expression);
3140         type           = skip_typeref(type);
3141
3142         entity_t *entry = expression->compound_entry;
3143         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3144
3145         if (entry->compound_member.bitfield) {
3146                 return bitfield_extract_to_firm(expression, addr);
3147         }
3148
3149         return deref_address(dbgi, type, addr);
3150 }
3151
3152 /* Values returned by __builtin_classify_type. */
3153 typedef enum gcc_type_class
3154 {
3155         no_type_class = -1,
3156         void_type_class,
3157         integer_type_class,
3158         char_type_class,
3159         enumeral_type_class,
3160         boolean_type_class,
3161         pointer_type_class,
3162         reference_type_class,
3163         offset_type_class,
3164         real_type_class,
3165         complex_type_class,
3166         function_type_class,
3167         method_type_class,
3168         record_type_class,
3169         union_type_class,
3170         array_type_class,
3171         string_type_class,
3172         set_type_class,
3173         file_type_class,
3174         lang_type_class
3175 } gcc_type_class;
3176
3177 static ir_node *classify_type_to_firm(const classify_type_expression_t *const expr)
3178 {
3179         type_t *type = expr->type_expression->base.type;
3180
3181         /* FIXME gcc returns different values depending on whether compiling C or C++
3182          * e.g. int x[10] is pointer_type_class in C, but array_type_class in C++ */
3183         gcc_type_class tc;
3184         for (;;) {
3185                 type = skip_typeref(type);
3186                 switch (type->kind) {
3187                         case TYPE_ATOMIC: {
3188                                 const atomic_type_t *const atomic_type = &type->atomic;
3189                                 switch (atomic_type->akind) {
3190                                         /* should not be reached */
3191                                         case ATOMIC_TYPE_INVALID:
3192                                                 tc = no_type_class;
3193                                                 goto make_const;
3194
3195                                         /* gcc cannot do that */
3196                                         case ATOMIC_TYPE_VOID:
3197                                                 tc = void_type_class;
3198                                                 goto make_const;
3199
3200                                         case ATOMIC_TYPE_WCHAR_T:   /* gcc handles this as integer */
3201                                         case ATOMIC_TYPE_CHAR:      /* gcc handles this as integer */
3202                                         case ATOMIC_TYPE_SCHAR:     /* gcc handles this as integer */
3203                                         case ATOMIC_TYPE_UCHAR:     /* gcc handles this as integer */
3204                                         case ATOMIC_TYPE_SHORT:
3205                                         case ATOMIC_TYPE_USHORT:
3206                                         case ATOMIC_TYPE_INT:
3207                                         case ATOMIC_TYPE_UINT:
3208                                         case ATOMIC_TYPE_LONG:
3209                                         case ATOMIC_TYPE_ULONG:
3210                                         case ATOMIC_TYPE_LONGLONG:
3211                                         case ATOMIC_TYPE_ULONGLONG:
3212                                         case ATOMIC_TYPE_BOOL:      /* gcc handles this as integer */
3213                                                 tc = integer_type_class;
3214                                                 goto make_const;
3215
3216                                         case ATOMIC_TYPE_FLOAT:
3217                                         case ATOMIC_TYPE_DOUBLE:
3218                                         case ATOMIC_TYPE_LONG_DOUBLE:
3219                                                 tc = real_type_class;
3220                                                 goto make_const;
3221                                 }
3222                                 panic("Unexpected atomic type in classify_type_to_firm().");
3223                         }
3224
3225                         case TYPE_COMPLEX:         tc = complex_type_class; goto make_const;
3226                         case TYPE_IMAGINARY:       tc = complex_type_class; goto make_const;
3227                         case TYPE_ARRAY:           /* gcc handles this as pointer */
3228                         case TYPE_FUNCTION:        /* gcc handles this as pointer */
3229                         case TYPE_POINTER:         tc = pointer_type_class; goto make_const;
3230                         case TYPE_COMPOUND_STRUCT: tc = record_type_class;  goto make_const;
3231                         case TYPE_COMPOUND_UNION:  tc = union_type_class;   goto make_const;
3232
3233                         /* gcc handles this as integer */
3234                         case TYPE_ENUM:            tc = integer_type_class; goto make_const;
3235
3236                         /* gcc classifies the referenced type */
3237                         case TYPE_REFERENCE: type = type->reference.refers_to; continue;
3238
3239                         /* typedef/typeof should be skipped already */
3240                         case TYPE_TYPEDEF:
3241                         case TYPE_TYPEOF:
3242                         case TYPE_ERROR:
3243                                 break;
3244                 }
3245                 panic("unexpected TYPE classify_type_to_firm().");
3246         }
3247
3248 make_const:;
3249         dbg_info  *const dbgi = get_dbg_info(&expr->base.source_position);
3250         ir_mode   *const mode = atomic_modes[ATOMIC_TYPE_INT];
3251         ir_tarval *const tv   = new_tarval_from_long(tc, mode);
3252         return new_d_Const(dbgi, tv);
3253 }
3254
3255 static ir_node *function_name_to_firm(
3256                 const funcname_expression_t *const expr)
3257 {
3258         switch(expr->kind) {
3259         case FUNCNAME_FUNCTION:
3260         case FUNCNAME_PRETTY_FUNCTION:
3261         case FUNCNAME_FUNCDNAME:
3262                 if (current_function_name == NULL) {
3263                         const source_position_t *const src_pos = &expr->base.source_position;
3264                         const char    *name  = current_function_entity->base.symbol->string;
3265                         const string_t string = { name, strlen(name) + 1 };
3266                         current_function_name = string_to_firm(src_pos, "__func__.%u", &string);
3267                 }
3268                 return current_function_name;
3269         case FUNCNAME_FUNCSIG:
3270                 if (current_funcsig == NULL) {
3271                         const source_position_t *const src_pos = &expr->base.source_position;
3272                         ir_entity *ent = get_irg_entity(current_ir_graph);
3273                         const char *const name = get_entity_ld_name(ent);
3274                         const string_t string = { name, strlen(name) + 1 };
3275                         current_funcsig = string_to_firm(src_pos, "__FUNCSIG__.%u", &string);
3276                 }
3277                 return current_funcsig;
3278         }
3279         panic("Unsupported function name");
3280 }
3281
3282 static ir_node *statement_expression_to_firm(const statement_expression_t *expr)
3283 {
3284         statement_t *statement = expr->statement;
3285
3286         assert(statement->kind == STATEMENT_COMPOUND);
3287         return compound_statement_to_firm(&statement->compound);
3288 }
3289
3290 static ir_node *va_start_expression_to_firm(
3291         const va_start_expression_t *const expr)
3292 {
3293         ir_entity *param_ent = current_vararg_entity;
3294         if (param_ent == NULL) {
3295                 size_t   const n           = IR_VA_START_PARAMETER_NUMBER;
3296                 ir_type *const frame_type  = get_irg_frame_type(current_ir_graph);
3297                 ir_type *const param_type  = get_unknown_type();
3298                 param_ent = new_parameter_entity(frame_type, n, param_type);
3299                 current_vararg_entity = param_ent;
3300         }
3301
3302         ir_node  *const frame   = get_irg_frame(current_ir_graph);
3303         dbg_info *const dbgi    = get_dbg_info(&expr->base.source_position);
3304         ir_node  *const no_mem  = new_NoMem();
3305         ir_node  *const arg_sel = new_d_simpleSel(dbgi, no_mem, frame, param_ent);
3306
3307         set_value_for_expression(expr->ap, arg_sel);
3308
3309         return NULL;
3310 }
3311
3312 static ir_node *va_arg_expression_to_firm(const va_arg_expression_t *const expr)
3313 {
3314         type_t       *const type    = expr->base.type;
3315         expression_t *const ap_expr = expr->ap;
3316         ir_node      *const ap_addr = expression_to_addr(ap_expr);
3317         ir_node      *const ap      = get_value_from_lvalue(ap_expr, ap_addr);
3318         dbg_info     *const dbgi    = get_dbg_info(&expr->base.source_position);
3319         ir_node      *const res     = deref_address(dbgi, type, ap);
3320
3321         ir_node      *const cnst    = get_type_size_node(expr->base.type);
3322         ir_mode      *const mode    = get_irn_mode(cnst);
3323         ir_node      *const c1      = new_Const_long(mode, stack_param_align - 1);
3324         ir_node      *const c2      = new_d_Add(dbgi, cnst, c1, mode);
3325         ir_node      *const c3      = new_Const_long(mode, -(long)stack_param_align);
3326         ir_node      *const c4      = new_d_And(dbgi, c2, c3, mode);
3327         ir_node      *const add     = new_d_Add(dbgi, ap, c4, mode_P_data);
3328
3329         set_value_for_expression_addr(ap_expr, add, ap_addr);
3330
3331         return res;
3332 }
3333
3334 /**
3335  * Generate Firm for a va_copy expression.
3336  */
3337 static ir_node *va_copy_expression_to_firm(const va_copy_expression_t *const expr)
3338 {
3339         ir_node *const src = expression_to_firm(expr->src);
3340         set_value_for_expression(expr->dst, src);
3341         return NULL;
3342 }
3343
3344 static ir_node *dereference_addr(const unary_expression_t *const expression)
3345 {
3346         assert(expression->base.kind == EXPR_UNARY_DEREFERENCE);
3347         return expression_to_firm(expression->value);
3348 }
3349
3350 /**
3351  * Returns a IR-node representing an lvalue of the given expression.
3352  */
3353 static ir_node *expression_to_addr(const expression_t *expression)
3354 {
3355         switch(expression->kind) {
3356         case EXPR_ARRAY_ACCESS:
3357                 return array_access_addr(&expression->array_access);
3358         case EXPR_CALL:
3359                 return call_expression_to_firm(&expression->call);
3360         case EXPR_COMPOUND_LITERAL:
3361                 return compound_literal_addr(&expression->compound_literal);
3362         case EXPR_REFERENCE:
3363                 return reference_addr(&expression->reference);
3364         case EXPR_SELECT:
3365                 return select_addr(&expression->select);
3366         case EXPR_UNARY_DEREFERENCE:
3367                 return dereference_addr(&expression->unary);
3368         default:
3369                 break;
3370         }
3371         panic("trying to get address of non-lvalue");
3372 }
3373
3374 static ir_node *builtin_constant_to_firm(
3375                 const builtin_constant_expression_t *expression)
3376 {
3377         ir_mode *const mode = get_ir_mode_arithmetic(expression->base.type);
3378         bool     const v    = is_constant_expression(expression->value) == EXPR_CLASS_CONSTANT;
3379         return create_Const_from_bool(mode, v);
3380 }
3381
3382 static ir_node *builtin_types_compatible_to_firm(
3383                 const builtin_types_compatible_expression_t *expression)
3384 {
3385         type_t  *const left  = get_unqualified_type(skip_typeref(expression->left));
3386         type_t  *const right = get_unqualified_type(skip_typeref(expression->right));
3387         bool     const value = types_compatible(left, right);
3388         ir_mode *const mode  = get_ir_mode_arithmetic(expression->base.type);
3389         return create_Const_from_bool(mode, value);
3390 }
3391
3392 static ir_node *get_label_block(label_t *label)
3393 {
3394         if (label->block != NULL)
3395                 return label->block;
3396
3397         /* beware: might be called from create initializer with current_ir_graph
3398          * set to const_code_irg. */
3399         ir_graph *rem    = current_ir_graph;
3400         current_ir_graph = current_function;
3401
3402         ir_node *block = new_immBlock();
3403
3404         label->block = block;
3405
3406         ARR_APP1(label_t *, all_labels, label);
3407
3408         current_ir_graph = rem;
3409         return block;
3410 }
3411
3412 /**
3413  * Pointer to a label.  This is used for the
3414  * GNU address-of-label extension.
3415  */
3416 static ir_node *label_address_to_firm(const label_address_expression_t *label)
3417 {
3418         dbg_info  *dbgi   = get_dbg_info(&label->base.source_position);
3419         ir_node   *block  = get_label_block(label->label);
3420         ir_entity *entity = create_Block_entity(block);
3421
3422         symconst_symbol value;
3423         value.entity_p = entity;
3424         return new_d_SymConst(dbgi, mode_P_code, value, symconst_addr_ent);
3425 }
3426
3427 /**
3428  * creates firm nodes for an expression. The difference between this function
3429  * and expression_to_firm is, that this version might produce mode_b nodes
3430  * instead of mode_Is.
3431  */
3432 static ir_node *_expression_to_firm(expression_t const *const expr)
3433 {
3434 #ifndef NDEBUG
3435         if (!constant_folding) {
3436                 assert(!expr->base.transformed);
3437                 ((expression_t*)expr)->base.transformed = true;
3438         }
3439 #endif
3440
3441         switch (expr->kind) {
3442         case EXPR_ALIGNOF:                    return alignof_to_firm(                 &expr->typeprop);
3443         case EXPR_ARRAY_ACCESS:               return array_access_to_firm(            &expr->array_access);
3444         case EXPR_BINARY_CASES:               return binary_expression_to_firm(       &expr->binary);
3445         case EXPR_BUILTIN_CONSTANT_P:         return builtin_constant_to_firm(        &expr->builtin_constant);
3446         case EXPR_BUILTIN_TYPES_COMPATIBLE_P: return builtin_types_compatible_to_firm(&expr->builtin_types_compatible);
3447         case EXPR_CALL:                       return call_expression_to_firm(         &expr->call);
3448         case EXPR_CLASSIFY_TYPE:              return classify_type_to_firm(           &expr->classify_type);
3449         case EXPR_COMPOUND_LITERAL:           return compound_literal_to_firm(        &expr->compound_literal);
3450         case EXPR_CONDITIONAL:                return conditional_to_firm(             &expr->conditional);
3451         case EXPR_FUNCNAME:                   return function_name_to_firm(           &expr->funcname);
3452         case EXPR_LABEL_ADDRESS:              return label_address_to_firm(           &expr->label_address);
3453         case EXPR_LITERAL_CASES:              return literal_to_firm(                 &expr->literal);
3454         case EXPR_OFFSETOF:                   return offsetof_to_firm(                &expr->offsetofe);
3455         case EXPR_REFERENCE:                  return reference_expression_to_firm(    &expr->reference);
3456         case EXPR_ENUM_CONSTANT:              return enum_constant_to_firm(           &expr->reference);
3457         case EXPR_SELECT:                     return select_to_firm(                  &expr->select);
3458         case EXPR_SIZEOF:                     return sizeof_to_firm(                  &expr->typeprop);
3459         case EXPR_STATEMENT:                  return statement_expression_to_firm(    &expr->statement);
3460         case EXPR_UNARY_CASES:                return unary_expression_to_firm(        &expr->unary);
3461         case EXPR_VA_ARG:                     return va_arg_expression_to_firm(       &expr->va_arge);
3462         case EXPR_VA_COPY:                    return va_copy_expression_to_firm(      &expr->va_copye);
3463         case EXPR_VA_START:                   return va_start_expression_to_firm(     &expr->va_starte);
3464         case EXPR_WIDE_STRING_LITERAL:        return wide_string_literal_to_firm(     &expr->string_literal);
3465
3466         case EXPR_STRING_LITERAL: return string_to_firm(&expr->base.source_position, "str.%u", &expr->literal.value);
3467
3468         case EXPR_ERROR: break;
3469         }
3470         panic("invalid expression found");
3471 }
3472
3473 /**
3474  * Check if a given expression is a GNU __builtin_expect() call.
3475  */
3476 static bool is_builtin_expect(const expression_t *expression)
3477 {
3478         if (expression->kind != EXPR_CALL)
3479                 return false;
3480
3481         expression_t *function = expression->call.function;
3482         if (function->kind != EXPR_REFERENCE)
3483                 return false;
3484         reference_expression_t *ref = &function->reference;
3485         if (ref->entity->kind         != ENTITY_FUNCTION ||
3486             ref->entity->function.btk != BUILTIN_EXPECT)
3487                 return false;
3488
3489         return true;
3490 }
3491
3492 static bool produces_mode_b(const expression_t *expression)
3493 {
3494         switch (expression->kind) {
3495         case EXPR_BINARY_EQUAL:
3496         case EXPR_BINARY_NOTEQUAL:
3497         case EXPR_BINARY_LESS:
3498         case EXPR_BINARY_LESSEQUAL:
3499         case EXPR_BINARY_GREATER:
3500         case EXPR_BINARY_GREATEREQUAL:
3501         case EXPR_BINARY_ISGREATER:
3502         case EXPR_BINARY_ISGREATEREQUAL:
3503         case EXPR_BINARY_ISLESS:
3504         case EXPR_BINARY_ISLESSEQUAL:
3505         case EXPR_BINARY_ISLESSGREATER:
3506         case EXPR_BINARY_ISUNORDERED:
3507         case EXPR_UNARY_NOT:
3508                 return true;
3509
3510         case EXPR_CALL:
3511                 if (is_builtin_expect(expression)) {
3512                         expression_t *argument = expression->call.arguments->expression;
3513                         return produces_mode_b(argument);
3514                 }
3515                 return false;
3516         case EXPR_BINARY_COMMA:
3517                 return produces_mode_b(expression->binary.right);
3518
3519         default:
3520                 return false;
3521         }
3522 }
3523
3524 static ir_node *expression_to_firm(const expression_t *expression)
3525 {
3526         if (!produces_mode_b(expression)) {
3527                 ir_node *res = _expression_to_firm(expression);
3528                 assert(res == NULL || get_irn_mode(res) != mode_b);
3529                 return res;
3530         }
3531
3532         if (is_constant_expression(expression) == EXPR_CLASS_CONSTANT) {
3533                 bool const constant_folding_old = constant_folding;
3534                 constant_folding = true;
3535                 ir_node *res  = _expression_to_firm(expression);
3536                 constant_folding = constant_folding_old;
3537                 ir_mode *mode = get_ir_mode_arithmetic(expression->base.type);
3538                 assert(is_Const(res));
3539                 return create_Const_from_bool(mode, !is_Const_null(res));
3540         }
3541
3542         /* we have to produce a 0/1 from the mode_b expression */
3543         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3544         ir_mode  *mode = get_ir_mode_arithmetic(expression->base.type);
3545         return produce_condition_result(expression, mode, dbgi);
3546 }
3547
3548 /**
3549  * create a short-circuit expression evaluation that tries to construct
3550  * efficient control flow structures for &&, || and ! expressions
3551  */
3552 static ir_node *create_condition_evaluation(const expression_t *expression,
3553                                             ir_node *true_block,
3554                                             ir_node *false_block)
3555 {
3556         switch(expression->kind) {
3557         case EXPR_UNARY_NOT: {
3558                 const unary_expression_t *unary_expression = &expression->unary;
3559                 create_condition_evaluation(unary_expression->value, false_block,
3560                                             true_block);
3561                 return NULL;
3562         }
3563         case EXPR_BINARY_LOGICAL_AND: {
3564                 const binary_expression_t *binary_expression = &expression->binary;
3565
3566                 ir_node *extra_block = new_immBlock();
3567                 create_condition_evaluation(binary_expression->left, extra_block,
3568                                             false_block);
3569                 mature_immBlock(extra_block);
3570                 set_cur_block(extra_block);
3571                 create_condition_evaluation(binary_expression->right, true_block,
3572                                             false_block);
3573                 return NULL;
3574         }
3575         case EXPR_BINARY_LOGICAL_OR: {
3576                 const binary_expression_t *binary_expression = &expression->binary;
3577
3578                 ir_node *extra_block = new_immBlock();
3579                 create_condition_evaluation(binary_expression->left, true_block,
3580                                             extra_block);
3581                 mature_immBlock(extra_block);
3582                 set_cur_block(extra_block);
3583                 create_condition_evaluation(binary_expression->right, true_block,
3584                                             false_block);
3585                 return NULL;
3586         }
3587         default:
3588                 break;
3589         }
3590
3591         dbg_info *dbgi       = get_dbg_info(&expression->base.source_position);
3592         ir_node  *cond_expr  = _expression_to_firm(expression);
3593         ir_node  *condition  = create_conv(dbgi, cond_expr, mode_b);
3594         ir_node  *cond       = new_d_Cond(dbgi, condition);
3595         ir_node  *true_proj  = new_d_Proj(dbgi, cond, mode_X, pn_Cond_true);
3596         ir_node  *false_proj = new_d_Proj(dbgi, cond, mode_X, pn_Cond_false);
3597
3598         /* set branch prediction info based on __builtin_expect */
3599         if (is_builtin_expect(expression) && is_Cond(cond)) {
3600                 call_argument_t *argument = expression->call.arguments->next;
3601                 if (is_constant_expression(argument->expression) == EXPR_CLASS_CONSTANT) {
3602                         bool               const cnst = fold_constant_to_bool(argument->expression);
3603                         cond_jmp_predicate const pred = cnst ? COND_JMP_PRED_TRUE : COND_JMP_PRED_FALSE;
3604                         set_Cond_jmp_pred(cond, pred);
3605                 }
3606         }
3607
3608         add_immBlock_pred(true_block, true_proj);
3609         add_immBlock_pred(false_block, false_proj);
3610
3611         set_unreachable_now();
3612         return cond_expr;
3613 }
3614
3615 static void create_variable_entity(entity_t *variable,
3616                                    declaration_kind_t declaration_kind,
3617                                    ir_type *parent_type)
3618 {
3619         assert(variable->kind == ENTITY_VARIABLE);
3620         type_t    *type = skip_typeref(variable->declaration.type);
3621
3622         ident     *const id        = new_id_from_str(variable->base.symbol->string);
3623         ir_type   *const irtype    = get_ir_type(type);
3624         dbg_info  *const dbgi      = get_dbg_info(&variable->base.source_position);
3625         ir_entity *const irentity  = new_d_entity(parent_type, id, irtype, dbgi);
3626         unsigned         alignment = variable->declaration.alignment;
3627
3628         set_entity_alignment(irentity, alignment);
3629
3630         handle_decl_modifiers(irentity, variable);
3631
3632         variable->declaration.kind  = (unsigned char) declaration_kind;
3633         variable->variable.v.entity = irentity;
3634         set_entity_ld_ident(irentity, create_ld_ident(variable));
3635
3636         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
3637                 set_entity_volatility(irentity, volatility_is_volatile);
3638         }
3639 }
3640
3641
3642 typedef struct type_path_entry_t type_path_entry_t;
3643 struct type_path_entry_t {
3644         type_t           *type;
3645         ir_initializer_t *initializer;
3646         size_t            index;
3647         entity_t         *compound_entry;
3648 };
3649
3650 typedef struct type_path_t type_path_t;
3651 struct type_path_t {
3652         type_path_entry_t *path;
3653         type_t            *top_type;
3654         bool               invalid;
3655 };
3656
3657 static __attribute__((unused)) void debug_print_type_path(const type_path_t *path)
3658 {
3659         size_t len = ARR_LEN(path->path);
3660
3661         for (size_t i = 0; i < len; ++i) {
3662                 const type_path_entry_t *entry = & path->path[i];
3663
3664                 type_t *type = skip_typeref(entry->type);
3665                 if (is_type_compound(type)) {
3666                         fprintf(stderr, ".%s", entry->compound_entry->base.symbol->string);
3667                 } else if (is_type_array(type)) {
3668                         fprintf(stderr, "[%u]", (unsigned) entry->index);
3669                 } else {
3670                         fprintf(stderr, "-INVALID-");
3671                 }
3672         }
3673         fprintf(stderr, "  (");
3674         print_type(path->top_type);
3675         fprintf(stderr, ")");
3676 }
3677
3678 static type_path_entry_t *get_type_path_top(const type_path_t *path)
3679 {
3680         size_t len = ARR_LEN(path->path);
3681         assert(len > 0);
3682         return & path->path[len-1];
3683 }
3684
3685 static type_path_entry_t *append_to_type_path(type_path_t *path)
3686 {
3687         size_t len = ARR_LEN(path->path);
3688         ARR_RESIZE(type_path_entry_t, path->path, len+1);
3689
3690         type_path_entry_t *result = & path->path[len];
3691         memset(result, 0, sizeof(result[0]));
3692         return result;
3693 }
3694
3695 static size_t get_compound_member_count(const compound_type_t *type)
3696 {
3697         compound_t *compound  = type->compound;
3698         size_t      n_members = 0;
3699         entity_t   *member    = compound->members.entities;
3700         for ( ; member != NULL; member = member->base.next) {
3701                 ++n_members;
3702         }
3703
3704         return n_members;
3705 }
3706
3707 static ir_initializer_t *get_initializer_entry(type_path_t *path)
3708 {
3709         type_t *orig_top_type = path->top_type;
3710         type_t *top_type      = skip_typeref(orig_top_type);
3711
3712         assert(is_type_compound(top_type) || is_type_array(top_type));
3713
3714         if (ARR_LEN(path->path) == 0) {
3715                 return NULL;
3716         } else {
3717                 type_path_entry_t *top         = get_type_path_top(path);
3718                 ir_initializer_t  *initializer = top->initializer;
3719                 return get_initializer_compound_value(initializer, top->index);
3720         }
3721 }
3722
3723 static void descend_into_subtype(type_path_t *path)
3724 {
3725         type_t *orig_top_type = path->top_type;
3726         type_t *top_type      = skip_typeref(orig_top_type);
3727
3728         assert(is_type_compound(top_type) || is_type_array(top_type));
3729
3730         ir_initializer_t *initializer = get_initializer_entry(path);
3731
3732         type_path_entry_t *top = append_to_type_path(path);
3733         top->type              = top_type;
3734
3735         size_t len;
3736
3737         if (is_type_compound(top_type)) {
3738                 compound_t *const compound = top_type->compound.compound;
3739                 entity_t   *const entry    = skip_unnamed_bitfields(compound->members.entities);
3740
3741                 top->compound_entry = entry;
3742                 top->index          = 0;
3743                 len                 = get_compound_member_count(&top_type->compound);
3744                 if (entry != NULL) {
3745                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3746                         path->top_type = entry->declaration.type;
3747                 }
3748         } else {
3749                 assert(is_type_array(top_type));
3750                 assert(top_type->array.size > 0);
3751
3752                 top->index     = 0;
3753                 path->top_type = top_type->array.element_type;
3754                 len            = top_type->array.size;
3755         }
3756         if (initializer == NULL
3757                         || get_initializer_kind(initializer) == IR_INITIALIZER_NULL) {
3758                 initializer = create_initializer_compound(len);
3759                 /* we have to set the entry at the 2nd latest path entry... */
3760                 size_t path_len = ARR_LEN(path->path);
3761                 assert(path_len >= 1);
3762                 if (path_len > 1) {
3763                         type_path_entry_t *entry        = & path->path[path_len-2];
3764                         ir_initializer_t  *tinitializer = entry->initializer;
3765                         set_initializer_compound_value(tinitializer, entry->index,
3766                                                        initializer);
3767                 }
3768         }
3769         top->initializer = initializer;
3770 }
3771
3772 static void ascend_from_subtype(type_path_t *path)
3773 {
3774         type_path_entry_t *top = get_type_path_top(path);
3775
3776         path->top_type = top->type;
3777
3778         size_t len = ARR_LEN(path->path);
3779         ARR_RESIZE(type_path_entry_t, path->path, len-1);
3780 }
3781
3782 static void walk_designator(type_path_t *path, const designator_t *designator)
3783 {
3784         /* designators start at current object type */
3785         ARR_RESIZE(type_path_entry_t, path->path, 1);
3786
3787         for ( ; designator != NULL; designator = designator->next) {
3788                 type_path_entry_t *top         = get_type_path_top(path);
3789                 type_t            *orig_type   = top->type;
3790                 type_t            *type        = skip_typeref(orig_type);
3791
3792                 if (designator->symbol != NULL) {
3793                         assert(is_type_compound(type));
3794                         size_t    index  = 0;
3795                         symbol_t *symbol = designator->symbol;
3796
3797                         compound_t *compound = type->compound.compound;
3798                         entity_t   *iter     = compound->members.entities;
3799                         for ( ; iter != NULL; iter = iter->base.next, ++index) {
3800                                 if (iter->base.symbol == symbol) {
3801                                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
3802                                         break;
3803                                 }
3804                         }
3805                         assert(iter != NULL);
3806
3807                         /* revert previous initialisations of other union elements */
3808                         if (type->kind == TYPE_COMPOUND_UNION) {
3809                                 ir_initializer_t *initializer = top->initializer;
3810                                 if (initializer != NULL
3811                                         && get_initializer_kind(initializer) == IR_INITIALIZER_COMPOUND) {
3812                                         /* are we writing to a new element? */
3813                                         ir_initializer_t *oldi
3814                                                 = get_initializer_compound_value(initializer, index);
3815                                         if (get_initializer_kind(oldi) == IR_INITIALIZER_NULL) {
3816                                                 /* clear initializer */
3817                                                 size_t len
3818                                                         = get_initializer_compound_n_entries(initializer);
3819                                                 ir_initializer_t *nulli = get_initializer_null();
3820                                                 for (size_t i = 0; i < len; ++i) {
3821                                                         set_initializer_compound_value(initializer, i,
3822                                                                                        nulli);
3823                                                 }
3824                                         }
3825                                 }
3826                         }
3827
3828                         top->type           = orig_type;
3829                         top->compound_entry = iter;
3830                         top->index          = index;
3831                         orig_type           = iter->declaration.type;
3832                 } else {
3833                         expression_t *array_index = designator->array_index;
3834                         assert(designator->array_index != NULL);
3835                         assert(is_type_array(type));
3836
3837                         long index = fold_constant_to_int(array_index);
3838                         assert(index >= 0);
3839 #ifndef NDEBUG
3840                         if (type->array.size_constant) {
3841                                 long array_size = type->array.size;
3842                                 assert(index < array_size);
3843                         }
3844 #endif
3845
3846                         top->type  = orig_type;
3847                         top->index = (size_t) index;
3848                         orig_type  = type->array.element_type;
3849                 }
3850                 path->top_type = orig_type;
3851
3852                 if (designator->next != NULL) {
3853                         descend_into_subtype(path);
3854                 }
3855         }
3856
3857         path->invalid  = false;
3858 }
3859
3860 static void advance_current_object(type_path_t *path)
3861 {
3862         if (path->invalid) {
3863                 /* TODO: handle this... */
3864                 panic("invalid initializer in ast2firm (excessive elements)");
3865         }
3866
3867         type_path_entry_t *top = get_type_path_top(path);
3868
3869         type_t *type = skip_typeref(top->type);
3870         if (is_type_union(type)) {
3871                 /* only the first element is initialized in unions */
3872                 top->compound_entry = NULL;
3873         } else if (is_type_struct(type)) {
3874                 entity_t *entry = top->compound_entry;
3875
3876                 top->index++;
3877                 entry               = skip_unnamed_bitfields(entry->base.next);
3878                 top->compound_entry = entry;
3879                 if (entry != NULL) {
3880                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3881                         path->top_type = entry->declaration.type;
3882                         return;
3883                 }
3884         } else {
3885                 assert(is_type_array(type));
3886
3887                 top->index++;
3888                 if (!type->array.size_constant || top->index < type->array.size) {
3889                         return;
3890                 }
3891         }
3892
3893         /* we're past the last member of the current sub-aggregate, try if we
3894          * can ascend in the type hierarchy and continue with another subobject */
3895         size_t len = ARR_LEN(path->path);
3896
3897         if (len > 1) {
3898                 ascend_from_subtype(path);
3899                 advance_current_object(path);
3900         } else {
3901                 path->invalid = true;
3902         }
3903 }
3904
3905
3906 static ir_initializer_t *create_ir_initializer_value(
3907                 const initializer_value_t *initializer)
3908 {
3909         if (is_type_compound(initializer->value->base.type)) {
3910                 panic("initializer creation for compounds not implemented yet");
3911         }
3912         type_t       *type = initializer->value->base.type;
3913         expression_t *expr = initializer->value;
3914         ir_node *value = expression_to_firm(expr);
3915         ir_mode *mode  = get_ir_mode_storage(type);
3916         value          = create_conv(NULL, value, mode);
3917         return create_initializer_const(value);
3918 }
3919
3920 /** test wether type can be initialized by a string constant */
3921 static bool is_string_type(type_t *type)
3922 {
3923         type_t *inner;
3924         if (is_type_pointer(type)) {
3925                 inner = skip_typeref(type->pointer.points_to);
3926         } else if(is_type_array(type)) {
3927                 inner = skip_typeref(type->array.element_type);
3928         } else {
3929                 return false;
3930         }
3931
3932         return is_type_integer(inner);
3933 }
3934
3935 static ir_initializer_t *create_ir_initializer_list(
3936                 const initializer_list_t *initializer, type_t *type)
3937 {
3938         type_path_t path;
3939         memset(&path, 0, sizeof(path));
3940         path.top_type = type;
3941         path.path     = NEW_ARR_F(type_path_entry_t, 0);
3942
3943         descend_into_subtype(&path);
3944
3945         for (size_t i = 0; i < initializer->len; ++i) {
3946                 const initializer_t *sub_initializer = initializer->initializers[i];
3947
3948                 if (sub_initializer->kind == INITIALIZER_DESIGNATOR) {
3949                         walk_designator(&path, sub_initializer->designator.designator);
3950                         continue;
3951                 }
3952
3953                 if (sub_initializer->kind == INITIALIZER_VALUE) {
3954                         /* we might have to descend into types until we're at a scalar
3955                          * type */
3956                         while(true) {
3957                                 type_t *orig_top_type = path.top_type;
3958                                 type_t *top_type      = skip_typeref(orig_top_type);
3959
3960                                 if (is_type_scalar(top_type))
3961                                         break;
3962                                 descend_into_subtype(&path);
3963                         }
3964                 } else if (sub_initializer->kind == INITIALIZER_STRING
3965                                 || sub_initializer->kind == INITIALIZER_WIDE_STRING) {
3966                         /* we might have to descend into types until we're at a scalar
3967                          * type */
3968                         while (true) {
3969                                 type_t *orig_top_type = path.top_type;
3970                                 type_t *top_type      = skip_typeref(orig_top_type);
3971
3972                                 if (is_string_type(top_type))
3973                                         break;
3974                                 descend_into_subtype(&path);
3975                         }
3976                 }
3977
3978                 ir_initializer_t *sub_irinitializer
3979                         = create_ir_initializer(sub_initializer, path.top_type);
3980
3981                 size_t path_len = ARR_LEN(path.path);
3982                 assert(path_len >= 1);
3983                 type_path_entry_t *entry        = & path.path[path_len-1];
3984                 ir_initializer_t  *tinitializer = entry->initializer;
3985                 set_initializer_compound_value(tinitializer, entry->index,
3986                                                sub_irinitializer);
3987
3988                 advance_current_object(&path);
3989         }
3990
3991         assert(ARR_LEN(path.path) >= 1);
3992         ir_initializer_t *result = path.path[0].initializer;
3993         DEL_ARR_F(path.path);
3994
3995         return result;
3996 }
3997
3998 static ir_initializer_t *create_ir_initializer_string(
3999                 const initializer_string_t *initializer, type_t *type)
4000 {
4001         type = skip_typeref(type);
4002
4003         size_t            string_len    = initializer->string.size;
4004         assert(type->kind == TYPE_ARRAY);
4005         assert(type->array.size_constant);
4006         size_t            len           = type->array.size;
4007         ir_initializer_t *irinitializer = create_initializer_compound(len);
4008
4009         const char *string = initializer->string.begin;
4010         ir_mode    *mode   = get_ir_mode_storage(type->array.element_type);
4011
4012         for (size_t i = 0; i < len; ++i) {
4013                 char c = 0;
4014                 if (i < string_len)
4015                         c = string[i];
4016
4017                 ir_tarval        *tv = new_tarval_from_long(c, mode);
4018                 ir_initializer_t *char_initializer = create_initializer_tarval(tv);
4019
4020                 set_initializer_compound_value(irinitializer, i, char_initializer);
4021         }
4022
4023         return irinitializer;
4024 }
4025
4026 static ir_initializer_t *create_ir_initializer_wide_string(
4027                 const initializer_wide_string_t *initializer, type_t *type)
4028 {
4029         assert(type->kind == TYPE_ARRAY);
4030         assert(type->array.size_constant);
4031         size_t            len           = type->array.size;
4032         size_t            string_len    = wstrlen(&initializer->string);
4033         ir_initializer_t *irinitializer = create_initializer_compound(len);
4034
4035         const char *p    = initializer->string.begin;
4036         ir_mode    *mode = get_type_mode(ir_type_wchar_t);
4037
4038         for (size_t i = 0; i < len; ++i) {
4039                 utf32 c = 0;
4040                 if (i < string_len) {
4041                         c = read_utf8_char(&p);
4042                 }
4043                 ir_tarval *tv = new_tarval_from_long(c, mode);
4044                 ir_initializer_t *char_initializer = create_initializer_tarval(tv);
4045
4046                 set_initializer_compound_value(irinitializer, i, char_initializer);
4047         }
4048
4049         return irinitializer;
4050 }
4051
4052 static ir_initializer_t *create_ir_initializer(
4053                 const initializer_t *initializer, type_t *type)
4054 {
4055         switch(initializer->kind) {
4056                 case INITIALIZER_STRING:
4057                         return create_ir_initializer_string(&initializer->string, type);
4058
4059                 case INITIALIZER_WIDE_STRING:
4060                         return create_ir_initializer_wide_string(&initializer->wide_string,
4061                                                                  type);
4062
4063                 case INITIALIZER_LIST:
4064                         return create_ir_initializer_list(&initializer->list, type);
4065
4066                 case INITIALIZER_VALUE:
4067                         return create_ir_initializer_value(&initializer->value);
4068
4069                 case INITIALIZER_DESIGNATOR:
4070                         panic("unexpected designator initializer found");
4071         }
4072         panic("unknown initializer");
4073 }
4074
4075 /** ANSI C §6.7.8:21: If there are fewer initializers [..] than there
4076  *  are elements [...] the remainder of the aggregate shall be initialized
4077  *  implicitly the same as objects that have static storage duration. */
4078 static void create_dynamic_null_initializer(ir_entity *entity, dbg_info *dbgi,
4079                 ir_node *base_addr)
4080 {
4081         /* for unions we must NOT do anything for null initializers */
4082         ir_type *owner = get_entity_owner(entity);
4083         if (is_Union_type(owner)) {
4084                 return;
4085         }
4086
4087         ir_type *ent_type = get_entity_type(entity);
4088         /* create sub-initializers for a compound type */
4089         if (is_compound_type(ent_type)) {
4090                 unsigned n_members = get_compound_n_members(ent_type);
4091                 for (unsigned n = 0; n < n_members; ++n) {
4092                         ir_entity *member = get_compound_member(ent_type, n);
4093                         ir_node   *addr   = new_d_simpleSel(dbgi, new_NoMem(), base_addr,
4094                                                                 member);
4095                         create_dynamic_null_initializer(member, dbgi, addr);
4096                 }
4097                 return;
4098         }
4099         if (is_Array_type(ent_type)) {
4100                 assert(has_array_upper_bound(ent_type, 0));
4101                 long n = get_array_upper_bound_int(ent_type, 0);
4102                 for (long i = 0; i < n; ++i) {
4103                         ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
4104                         ir_tarval *index_tv = new_tarval_from_long(i, mode_uint);
4105                         ir_node   *cnst     = new_d_Const(dbgi, index_tv);
4106                         ir_node   *in[1]    = { cnst };
4107                         ir_entity *arrent   = get_array_element_entity(ent_type);
4108                         ir_node   *addr     = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in,
4109                                                         arrent);
4110                         create_dynamic_null_initializer(arrent, dbgi, addr);
4111                 }
4112                 return;
4113         }
4114
4115         ir_mode *value_mode = get_type_mode(ent_type);
4116         ir_node *node       = new_Const(get_mode_null(value_mode));
4117
4118         /* is it a bitfield type? */
4119         if (is_Primitive_type(ent_type) &&
4120                         get_primitive_base_type(ent_type) != NULL) {
4121                 bitfield_store_to_firm(dbgi, entity, base_addr, node, false, false);
4122                 return;
4123         }
4124
4125         ir_node *mem    = get_store();
4126         ir_node *store  = new_d_Store(dbgi, mem, base_addr, node, cons_none);
4127         ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4128         set_store(proj_m);
4129 }
4130
4131 static void create_dynamic_initializer_sub(ir_initializer_t *initializer,
4132                 ir_entity *entity, ir_type *type, dbg_info *dbgi, ir_node *base_addr)
4133 {
4134         switch(get_initializer_kind(initializer)) {
4135         case IR_INITIALIZER_NULL:
4136                 create_dynamic_null_initializer(entity, dbgi, base_addr);
4137                 return;
4138         case IR_INITIALIZER_CONST: {
4139                 ir_node *node     = get_initializer_const_value(initializer);
4140                 ir_type *ent_type = get_entity_type(entity);
4141
4142                 /* is it a bitfield type? */
4143                 if (is_Primitive_type(ent_type) &&
4144                                 get_primitive_base_type(ent_type) != NULL) {
4145                         bitfield_store_to_firm(dbgi, entity, base_addr, node, false, false);
4146                         return;
4147                 }
4148
4149                 assert(get_type_mode(type) == get_irn_mode(node));
4150                 ir_node *mem    = get_store();
4151                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, node, cons_none);
4152                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4153                 set_store(proj_m);
4154                 return;
4155         }
4156         case IR_INITIALIZER_TARVAL: {
4157                 ir_tarval *tv       = get_initializer_tarval_value(initializer);
4158                 ir_node   *cnst     = new_d_Const(dbgi, tv);
4159                 ir_type   *ent_type = get_entity_type(entity);
4160
4161                 /* is it a bitfield type? */
4162                 if (is_Primitive_type(ent_type) &&
4163                                 get_primitive_base_type(ent_type) != NULL) {
4164                         bitfield_store_to_firm(dbgi, entity, base_addr, cnst, false, false);
4165                         return;
4166                 }
4167
4168                 assert(get_type_mode(type) == get_tarval_mode(tv));
4169                 ir_node *mem    = get_store();
4170                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, cnst, cons_none);
4171                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4172                 set_store(proj_m);
4173                 return;
4174         }
4175         case IR_INITIALIZER_COMPOUND: {
4176                 assert(is_compound_type(type) || is_Array_type(type));
4177                 int n_members;
4178                 if (is_Array_type(type)) {
4179                         assert(has_array_upper_bound(type, 0));
4180                         n_members = get_array_upper_bound_int(type, 0);
4181                 } else {
4182                         n_members = get_compound_n_members(type);
4183                 }
4184
4185                 if (get_initializer_compound_n_entries(initializer)
4186                                 != (unsigned) n_members)
4187                         panic("initializer doesn't match compound type");
4188
4189                 for (int i = 0; i < n_members; ++i) {
4190                         ir_node   *addr;
4191                         ir_type   *irtype;
4192                         ir_entity *sub_entity;
4193                         if (is_Array_type(type)) {
4194                                 ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
4195                                 ir_tarval *index_tv = new_tarval_from_long(i, mode_uint);
4196                                 ir_node   *cnst     = new_d_Const(dbgi, index_tv);
4197                                 ir_node   *in[1]    = { cnst };
4198                                 irtype     = get_array_element_type(type);
4199                                 sub_entity = get_array_element_entity(type);
4200                                 addr       = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in,
4201                                                        sub_entity);
4202                         } else {
4203                                 sub_entity = get_compound_member(type, i);
4204                                 irtype     = get_entity_type(sub_entity);
4205                                 addr       = new_d_simpleSel(dbgi, new_NoMem(), base_addr,
4206                                                              sub_entity);
4207                         }
4208
4209                         ir_initializer_t *sub_init
4210                                 = get_initializer_compound_value(initializer, i);
4211
4212                         create_dynamic_initializer_sub(sub_init, sub_entity, irtype, dbgi,
4213                                                        addr);
4214                 }
4215                 return;
4216         }
4217         }
4218
4219         panic("invalid IR_INITIALIZER found");
4220 }
4221
4222 static void create_dynamic_initializer(ir_initializer_t *initializer,
4223                 dbg_info *dbgi, ir_entity *entity)
4224 {
4225         ir_node *frame     = get_irg_frame(current_ir_graph);
4226         ir_node *base_addr = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
4227         ir_type *type      = get_entity_type(entity);
4228
4229         create_dynamic_initializer_sub(initializer, entity, type, dbgi, base_addr);
4230 }
4231
4232 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
4233                                      ir_entity *entity, type_t *type)
4234 {
4235         ir_node *memory = get_store();
4236         ir_node *nomem  = new_NoMem();
4237         ir_node *frame  = get_irg_frame(current_ir_graph);
4238         ir_node *addr   = new_d_simpleSel(dbgi, nomem, frame, entity);
4239
4240         if (initializer->kind == INITIALIZER_VALUE) {
4241                 initializer_value_t *initializer_value = &initializer->value;
4242
4243                 ir_node *value = expression_to_firm(initializer_value->value);
4244                 type = skip_typeref(type);
4245                 assign_value(dbgi, addr, type, value);
4246                 return;
4247         }
4248
4249         if (is_constant_initializer(initializer) == EXPR_CLASS_VARIABLE) {
4250                 ir_initializer_t *irinitializer
4251                         = create_ir_initializer(initializer, type);
4252
4253                 create_dynamic_initializer(irinitializer, dbgi, entity);
4254                 return;
4255         }
4256
4257         /* create a "template" entity which is copied to the entity on the stack */
4258         ir_entity *const init_entity
4259                 = create_initializer_entity(dbgi, initializer, type);
4260         ir_node *const src_addr = create_symconst(dbgi, init_entity);
4261         ir_type *const irtype   = get_ir_type(type);
4262         ir_node *const copyb    = new_d_CopyB(dbgi, memory, addr, src_addr, irtype);
4263
4264         ir_node *const copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
4265         set_store(copyb_mem);
4266 }
4267
4268 static void create_initializer_local_variable_entity(entity_t *entity)
4269 {
4270         assert(entity->kind == ENTITY_VARIABLE);
4271         initializer_t *initializer = entity->variable.initializer;
4272         dbg_info      *dbgi        = get_dbg_info(&entity->base.source_position);
4273         ir_entity     *irentity    = entity->variable.v.entity;
4274         type_t        *type        = entity->declaration.type;
4275
4276         create_local_initializer(initializer, dbgi, irentity, type);
4277 }
4278
4279 static void create_variable_initializer(entity_t *entity)
4280 {
4281         assert(entity->kind == ENTITY_VARIABLE);
4282         initializer_t *initializer = entity->variable.initializer;
4283         if (initializer == NULL)
4284                 return;
4285
4286         declaration_kind_t declaration_kind
4287                 = (declaration_kind_t) entity->declaration.kind;
4288         if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY) {
4289                 create_initializer_local_variable_entity(entity);
4290                 return;
4291         }
4292
4293         type_t            *type = entity->declaration.type;
4294         type_qualifiers_t  tq   = get_type_qualifier(type, true);
4295
4296         if (initializer->kind == INITIALIZER_VALUE) {
4297                 initializer_value_t *initializer_value = &initializer->value;
4298                 dbg_info            *dbgi = get_dbg_info(&entity->base.source_position);
4299                 expression_t        *value     = initializer_value->value;
4300                 type_t              *init_type = value->base.type;
4301                 type_t              *skipped   = skip_typeref(init_type);
4302
4303                 if (!is_type_scalar(skipped)) {
4304                         /* skip convs */
4305                         while (value->kind == EXPR_UNARY_CAST)
4306                                 value = value->unary.value;
4307
4308                         if (value->kind != EXPR_COMPOUND_LITERAL)
4309                                 panic("expected non-scalar initializer to be a compound literal");
4310                         initializer = value->compound_literal.initializer;
4311                         goto have_initializer;
4312                 }
4313
4314                 ir_node *node = expression_to_firm(initializer_value->value);
4315
4316                 ir_mode *mode      = get_ir_mode_storage(init_type);
4317                 node = create_conv(dbgi, node, mode);
4318                 node = do_strict_conv(dbgi, node);
4319
4320                 if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE) {
4321                         set_value(entity->variable.v.value_number, node);
4322                 } else {
4323                         assert(declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4324
4325                         ir_entity *irentity = entity->variable.v.entity;
4326
4327                         if (tq & TYPE_QUALIFIER_CONST
4328                                         && get_entity_owner(irentity) != get_tls_type()) {
4329                                 add_entity_linkage(irentity, IR_LINKAGE_CONSTANT);
4330                         }
4331                         set_atomic_ent_value(irentity, node);
4332                 }
4333         } else {
4334 have_initializer:
4335                 assert(declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY ||
4336                        declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4337
4338                 ir_entity        *irentity        = entity->variable.v.entity;
4339                 ir_initializer_t *irinitializer
4340                         = create_ir_initializer(initializer, type);
4341
4342                 if (tq & TYPE_QUALIFIER_CONST) {
4343                         add_entity_linkage(irentity, IR_LINKAGE_CONSTANT);
4344                 }
4345                 set_entity_initializer(irentity, irinitializer);
4346         }
4347 }
4348
4349 static void create_variable_length_array(entity_t *entity)
4350 {
4351         assert(entity->kind == ENTITY_VARIABLE);
4352         assert(entity->variable.initializer == NULL);
4353
4354         entity->declaration.kind    = DECLARATION_KIND_VARIABLE_LENGTH_ARRAY;
4355         entity->variable.v.vla_base = NULL;
4356
4357         /* TODO: record VLA somewhere so we create the free node when we leave
4358          * it's scope */
4359 }
4360
4361 static void allocate_variable_length_array(entity_t *entity)
4362 {
4363         assert(entity->kind == ENTITY_VARIABLE);
4364         assert(entity->variable.initializer == NULL);
4365         assert(currently_reachable());
4366
4367         dbg_info *dbgi      = get_dbg_info(&entity->base.source_position);
4368         type_t   *type      = entity->declaration.type;
4369         ir_type  *el_type   = get_ir_type(type->array.element_type);
4370
4371         /* make sure size_node is calculated */
4372         get_type_size_node(type);
4373         ir_node  *elems = type->array.size_node;
4374         ir_node  *mem   = get_store();
4375         ir_node  *alloc = new_d_Alloc(dbgi, mem, elems, el_type, stack_alloc);
4376
4377         ir_node  *proj_m = new_d_Proj(dbgi, alloc, mode_M, pn_Alloc_M);
4378         ir_node  *addr   = new_d_Proj(dbgi, alloc, mode_P_data, pn_Alloc_res);
4379         set_store(proj_m);
4380
4381         assert(entity->declaration.kind == DECLARATION_KIND_VARIABLE_LENGTH_ARRAY);
4382         entity->variable.v.vla_base = addr;
4383 }
4384
4385 /**
4386  * Creates a Firm local variable from a declaration.
4387  */
4388 static void create_local_variable(entity_t *entity)
4389 {
4390         assert(entity->kind == ENTITY_VARIABLE);
4391         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4392
4393         bool needs_entity = entity->variable.address_taken;
4394         type_t *type = skip_typeref(entity->declaration.type);
4395
4396         /* is it a variable length array? */
4397         if (is_type_array(type) && !type->array.size_constant) {
4398                 create_variable_length_array(entity);
4399                 return;
4400         } else if (is_type_array(type) || is_type_compound(type)) {
4401                 needs_entity = true;
4402         } else if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
4403                 needs_entity = true;
4404         }
4405
4406         if (needs_entity) {
4407                 ir_type *frame_type = get_irg_frame_type(current_ir_graph);
4408                 create_variable_entity(entity,
4409                                        DECLARATION_KIND_LOCAL_VARIABLE_ENTITY,
4410                                        frame_type);
4411         } else {
4412                 entity->declaration.kind        = DECLARATION_KIND_LOCAL_VARIABLE;
4413                 entity->variable.v.value_number = next_value_number_function;
4414                 set_irg_loc_description(current_ir_graph, next_value_number_function,
4415                                         entity);
4416                 ++next_value_number_function;
4417         }
4418 }
4419
4420 static void create_local_static_variable(entity_t *entity)
4421 {
4422         assert(entity->kind == ENTITY_VARIABLE);
4423         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4424
4425         type_t   *type           = skip_typeref(entity->declaration.type);
4426         ir_type  *const var_type = entity->variable.thread_local ?
4427                 get_tls_type() : get_glob_type();
4428         ir_type  *const irtype   = get_ir_type(type);
4429         dbg_info *const dbgi     = get_dbg_info(&entity->base.source_position);
4430
4431         size_t l = strlen(entity->base.symbol->string);
4432         char   buf[l + sizeof(".%u")];
4433         snprintf(buf, sizeof(buf), "%s.%%u", entity->base.symbol->string);
4434         ident     *const id       = id_unique(buf);
4435         ir_entity *const irentity = new_d_entity(var_type, id, irtype, dbgi);
4436
4437         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
4438                 set_entity_volatility(irentity, volatility_is_volatile);
4439         }
4440
4441         entity->declaration.kind  = DECLARATION_KIND_GLOBAL_VARIABLE;
4442         entity->variable.v.entity = irentity;
4443
4444         set_entity_ld_ident(irentity, id);
4445         set_entity_visibility(irentity, ir_visibility_local);
4446
4447         ir_graph *const old_current_ir_graph = current_ir_graph;
4448         current_ir_graph = get_const_code_irg();
4449
4450         create_variable_initializer(entity);
4451
4452         assert(current_ir_graph == get_const_code_irg());
4453         current_ir_graph = old_current_ir_graph;
4454 }
4455
4456
4457
4458 static ir_node *return_statement_to_firm(return_statement_t *statement)
4459 {
4460         if (!currently_reachable())
4461                 return NULL;
4462
4463         dbg_info *dbgi        = get_dbg_info(&statement->base.source_position);
4464         type_t   *type        = current_function_entity->declaration.type;
4465         ir_type  *func_irtype = get_ir_type(type);
4466
4467         ir_node *in[1];
4468         int      in_len;
4469         if (get_method_n_ress(func_irtype) > 0) {
4470                 ir_type *res_type = get_method_res_type(func_irtype, 0);
4471
4472                 if (statement->value != NULL) {
4473                         ir_node *node = expression_to_firm(statement->value);
4474                         if (!is_compound_type(res_type)) {
4475                                 type_t  *ret_value_type = statement->value->base.type;
4476                                 ir_mode *mode           = get_ir_mode_storage(ret_value_type);
4477                                 node                    = create_conv(dbgi, node, mode);
4478                                 node                    = do_strict_conv(dbgi, node);
4479                         }
4480                         in[0] = node;
4481                 } else {
4482                         ir_mode *mode;
4483                         if (is_compound_type(res_type)) {
4484                                 mode = mode_P_data;
4485                         } else {
4486                                 mode = get_type_mode(res_type);
4487                         }
4488                         in[0] = new_Unknown(mode);
4489                 }
4490                 in_len = 1;
4491         } else {
4492                 /* build return_value for its side effects */
4493                 if (statement->value != NULL) {
4494                         expression_to_firm(statement->value);
4495                 }
4496                 in_len = 0;
4497         }
4498
4499         ir_node  *store = get_store();
4500         ir_node  *ret   = new_d_Return(dbgi, store, in_len, in);
4501
4502         ir_node *end_block = get_irg_end_block(current_ir_graph);
4503         add_immBlock_pred(end_block, ret);
4504
4505         set_unreachable_now();
4506         return NULL;
4507 }
4508
4509 static ir_node *expression_statement_to_firm(expression_statement_t *statement)
4510 {
4511         if (!currently_reachable())
4512                 return NULL;
4513
4514         return expression_to_firm(statement->expression);
4515 }
4516
4517 static ir_node *compound_statement_to_firm(compound_statement_t *compound)
4518 {
4519         entity_t *entity = compound->scope.entities;
4520         for ( ; entity != NULL; entity = entity->base.next) {
4521                 if (!is_declaration(entity))
4522                         continue;
4523
4524                 create_local_declaration(entity);
4525         }
4526
4527         ir_node     *result    = NULL;
4528         statement_t *statement = compound->statements;
4529         for ( ; statement != NULL; statement = statement->base.next) {
4530                 result = statement_to_firm(statement);
4531         }
4532
4533         return result;
4534 }
4535
4536 static void create_global_variable(entity_t *entity)
4537 {
4538         ir_linkage    linkage    = IR_LINKAGE_DEFAULT;
4539         ir_visibility visibility = ir_visibility_default;
4540         ir_entity    *irentity;
4541         assert(entity->kind == ENTITY_VARIABLE);
4542
4543         switch ((storage_class_tag_t)entity->declaration.storage_class) {
4544         case STORAGE_CLASS_EXTERN: visibility = ir_visibility_external; break;
4545         case STORAGE_CLASS_STATIC: visibility = ir_visibility_local;    break;
4546         case STORAGE_CLASS_NONE:
4547                 visibility = ir_visibility_default;
4548                 /* uninitialized globals get merged in C */
4549                 if (entity->variable.initializer == NULL)
4550                         linkage |= IR_LINKAGE_MERGE;
4551                 break;
4552         case STORAGE_CLASS_TYPEDEF:
4553         case STORAGE_CLASS_AUTO:
4554         case STORAGE_CLASS_REGISTER:
4555                 panic("invalid storage class for global var");
4556         }
4557
4558         ir_type *var_type = get_glob_type();
4559         if (entity->variable.thread_local) {
4560                 var_type = get_tls_type();
4561                 /* LINKAGE_MERGE not supported by current linkers */
4562                 linkage &= ~IR_LINKAGE_MERGE;
4563         }
4564         create_variable_entity(entity, DECLARATION_KIND_GLOBAL_VARIABLE, var_type);
4565         irentity = entity->variable.v.entity;
4566         add_entity_linkage(irentity, linkage);
4567         set_entity_visibility(irentity, visibility);
4568 }
4569
4570 static void create_local_declaration(entity_t *entity)
4571 {
4572         assert(is_declaration(entity));
4573
4574         /* construct type */
4575         (void) get_ir_type(entity->declaration.type);
4576         if (entity->base.symbol == NULL) {
4577                 return;
4578         }
4579
4580         switch ((storage_class_tag_t) entity->declaration.storage_class) {
4581         case STORAGE_CLASS_STATIC:
4582                 if (entity->kind == ENTITY_FUNCTION) {
4583                         (void)get_function_entity(entity, NULL);
4584                 } else {
4585                         create_local_static_variable(entity);
4586                 }
4587                 return;
4588         case STORAGE_CLASS_EXTERN:
4589                 if (entity->kind == ENTITY_FUNCTION) {
4590                         assert(entity->function.statement == NULL);
4591                         (void)get_function_entity(entity, NULL);
4592                 } else {
4593                         create_global_variable(entity);
4594                         create_variable_initializer(entity);
4595                 }
4596                 return;
4597         case STORAGE_CLASS_NONE:
4598         case STORAGE_CLASS_AUTO:
4599         case STORAGE_CLASS_REGISTER:
4600                 if (entity->kind == ENTITY_FUNCTION) {
4601                         if (entity->function.statement != NULL) {
4602                                 ir_type *owner = get_irg_frame_type(current_ir_graph);
4603                                 (void)get_function_entity(entity, owner);
4604                                 entity->declaration.kind = DECLARATION_KIND_INNER_FUNCTION;
4605                                 enqueue_inner_function(entity);
4606                         } else {
4607                                 (void)get_function_entity(entity, NULL);
4608                         }
4609                 } else {
4610                         create_local_variable(entity);
4611                 }
4612                 return;
4613         case STORAGE_CLASS_TYPEDEF:
4614                 break;
4615         }
4616         panic("invalid storage class found");
4617 }
4618
4619 static void initialize_local_declaration(entity_t *entity)
4620 {
4621         if (entity->base.symbol == NULL)
4622                 return;
4623
4624         // no need to emit code in dead blocks
4625         if (entity->declaration.storage_class != STORAGE_CLASS_STATIC
4626                         && !currently_reachable())
4627                 return;
4628
4629         switch ((declaration_kind_t) entity->declaration.kind) {
4630         case DECLARATION_KIND_LOCAL_VARIABLE:
4631         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY:
4632                 create_variable_initializer(entity);
4633                 return;
4634
4635         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
4636                 allocate_variable_length_array(entity);
4637                 return;
4638
4639         case DECLARATION_KIND_COMPOUND_MEMBER:
4640         case DECLARATION_KIND_GLOBAL_VARIABLE:
4641         case DECLARATION_KIND_FUNCTION:
4642         case DECLARATION_KIND_INNER_FUNCTION:
4643                 return;
4644
4645         case DECLARATION_KIND_PARAMETER:
4646         case DECLARATION_KIND_PARAMETER_ENTITY:
4647                 panic("can't initialize parameters");
4648
4649         case DECLARATION_KIND_UNKNOWN:
4650                 panic("can't initialize unknown declaration");
4651         }
4652         panic("invalid declaration kind");
4653 }
4654
4655 static ir_node *declaration_statement_to_firm(declaration_statement_t *statement)
4656 {
4657         entity_t *entity = statement->declarations_begin;
4658         if (entity == NULL)
4659                 return NULL;
4660
4661         entity_t *const last = statement->declarations_end;
4662         for ( ;; entity = entity->base.next) {
4663                 if (is_declaration(entity)) {
4664                         initialize_local_declaration(entity);
4665                 } else if (entity->kind == ENTITY_TYPEDEF) {
4666                         /* §6.7.7:3  Any array size expressions associated with variable length
4667                          * array declarators are evaluated each time the declaration of the
4668                          * typedef name is reached in the order of execution. */
4669                         type_t *const type = skip_typeref(entity->typedefe.type);
4670                         if (is_type_array(type) && type->array.is_vla)
4671                                 get_vla_size(&type->array);
4672                 }
4673                 if (entity == last)
4674                         break;
4675         }
4676
4677         return NULL;
4678 }
4679
4680 static ir_node *if_statement_to_firm(if_statement_t *statement)
4681 {
4682         /* Create the condition. */
4683         ir_node *true_block  = NULL;
4684         ir_node *false_block = NULL;
4685         if (currently_reachable()) {
4686                 true_block  = new_immBlock();
4687                 false_block = new_immBlock();
4688                 create_condition_evaluation(statement->condition, true_block, false_block);
4689                 mature_immBlock(true_block);
4690                 mature_immBlock(false_block);
4691         }
4692
4693         /* Create the true statement. */
4694         set_cur_block(true_block);
4695         statement_to_firm(statement->true_statement);
4696         ir_node *fallthrough_block = get_cur_block();
4697
4698         /* Create the false statement. */
4699         set_cur_block(false_block);
4700         if (statement->false_statement != NULL) {
4701                 statement_to_firm(statement->false_statement);
4702         }
4703
4704         /* Handle the block after the if-statement.  Minor simplification and
4705          * optimisation: Reuse the false/true block as fallthrough block, if the
4706          * true/false statement does not pass control to the fallthrough block, e.g.
4707          * in the typical if (x) return; pattern. */
4708         if (fallthrough_block) {
4709                 if (currently_reachable()) {
4710                         ir_node *const t_jump = new_r_Jmp(fallthrough_block);
4711                         ir_node *const f_jump = new_Jmp();
4712                         ir_node *const in[]   = { t_jump, f_jump };
4713                         fallthrough_block = new_Block(2, in);
4714                 }
4715                 set_cur_block(fallthrough_block);
4716         }
4717
4718         return NULL;
4719 }
4720
4721 /**
4722  * Add an unconditional jump to the target block.  If the source block is not
4723  * reachable, then a Bad predecessor is created to prevent Phi-less unreachable
4724  * loops.  This is necessary if the jump potentially enters a loop.
4725  */
4726 static void jump_to(ir_node *const target_block)
4727 {
4728         ir_node *const pred = currently_reachable() ? new_Jmp() : new_Bad(mode_X);
4729         add_immBlock_pred(target_block, pred);
4730 }
4731
4732 /**
4733  * Add an unconditional jump to the target block, if the current block is
4734  * reachable and do nothing otherwise.  This is only valid if the jump does not
4735  * enter a loop (a back edge is ok).
4736  */
4737 static void jump_if_reachable(ir_node *const target_block)
4738 {
4739         if (currently_reachable())
4740                 add_immBlock_pred(target_block, new_Jmp());
4741 }
4742
4743 static ir_node *while_statement_to_firm(while_statement_t *statement)
4744 {
4745         /* Create the header block */
4746         ir_node *const header_block = new_immBlock();
4747         jump_to(header_block);
4748
4749         /* Create the condition. */
4750         ir_node      *      body_block;
4751         ir_node      *      false_block;
4752         expression_t *const cond = statement->condition;
4753         if (is_constant_expression(cond) == EXPR_CLASS_CONSTANT &&
4754                         fold_constant_to_bool(cond)) {
4755                 /* Shortcut for while (true). */
4756                 body_block  = header_block;
4757                 false_block = NULL;
4758
4759                 keep_alive(header_block);
4760                 keep_all_memory(header_block);
4761         } else {
4762                 body_block  = new_immBlock();
4763                 false_block = new_immBlock();
4764
4765                 set_cur_block(header_block);
4766                 create_condition_evaluation(cond, body_block, false_block);
4767                 mature_immBlock(body_block);
4768         }
4769
4770         ir_node *const old_continue_label = continue_label;
4771         ir_node *const old_break_label    = break_label;
4772         continue_label = header_block;
4773         break_label    = false_block;
4774
4775         /* Create the loop body. */
4776         set_cur_block(body_block);
4777         statement_to_firm(statement->body);
4778         jump_if_reachable(header_block);
4779
4780         mature_immBlock(header_block);
4781         assert(false_block == NULL || false_block == break_label);
4782         false_block = break_label;
4783         if (false_block != NULL) {
4784                 mature_immBlock(false_block);
4785         }
4786         set_cur_block(false_block);
4787
4788         assert(continue_label == header_block);
4789         continue_label = old_continue_label;
4790         break_label    = old_break_label;
4791         return NULL;
4792 }
4793
4794 static ir_node *get_break_label(void)
4795 {
4796         if (break_label == NULL) {
4797                 break_label = new_immBlock();
4798         }
4799         return break_label;
4800 }
4801
4802 static ir_node *do_while_statement_to_firm(do_while_statement_t *statement)
4803 {
4804         /* create the header block */
4805         ir_node *header_block = new_immBlock();
4806
4807         /* the loop body */
4808         ir_node *body_block = new_immBlock();
4809         jump_to(body_block);
4810
4811         ir_node *old_continue_label = continue_label;
4812         ir_node *old_break_label    = break_label;
4813         continue_label              = header_block;
4814         break_label                 = NULL;
4815
4816         set_cur_block(body_block);
4817         statement_to_firm(statement->body);
4818         ir_node *const false_block = get_break_label();
4819
4820         assert(continue_label == header_block);
4821         continue_label = old_continue_label;
4822         break_label    = old_break_label;
4823
4824         jump_if_reachable(header_block);
4825
4826         /* create the condition */
4827         mature_immBlock(header_block);
4828         set_cur_block(header_block);
4829
4830         create_condition_evaluation(statement->condition, body_block, false_block);
4831         mature_immBlock(body_block);
4832         mature_immBlock(false_block);
4833
4834         set_cur_block(false_block);
4835         return NULL;
4836 }
4837
4838 static ir_node *for_statement_to_firm(for_statement_t *statement)
4839 {
4840         /* create declarations */
4841         entity_t *entity = statement->scope.entities;
4842         for ( ; entity != NULL; entity = entity->base.next) {
4843                 if (!is_declaration(entity))
4844                         continue;
4845
4846                 create_local_declaration(entity);
4847         }
4848
4849         if (currently_reachable()) {
4850                 entity = statement->scope.entities;
4851                 for ( ; entity != NULL; entity = entity->base.next) {
4852                         if (!is_declaration(entity))
4853                                 continue;
4854
4855                         initialize_local_declaration(entity);
4856                 }
4857
4858                 if (statement->initialisation != NULL) {
4859                         expression_to_firm(statement->initialisation);
4860                 }
4861         }
4862
4863         /* Create the header block */
4864         ir_node *const header_block = new_immBlock();
4865         jump_to(header_block);
4866
4867         /* Create the condition. */
4868         ir_node *body_block;
4869         ir_node *false_block;
4870         if (statement->condition != NULL) {
4871                 body_block  = new_immBlock();
4872                 false_block = new_immBlock();
4873
4874                 set_cur_block(header_block);
4875                 create_condition_evaluation(statement->condition, body_block, false_block);
4876                 mature_immBlock(body_block);
4877         } else {
4878                 /* for-ever. */
4879                 body_block  = header_block;
4880                 false_block = NULL;
4881
4882                 keep_alive(header_block);
4883                 keep_all_memory(header_block);
4884         }
4885
4886         /* Create the step block, if necessary. */
4887         ir_node      *      step_block = header_block;
4888         expression_t *const step       = statement->step;
4889         if (step != NULL) {
4890                 step_block = new_immBlock();
4891         }
4892
4893         ir_node *const old_continue_label = continue_label;
4894         ir_node *const old_break_label    = break_label;
4895         continue_label = step_block;
4896         break_label    = false_block;
4897
4898         /* Create the loop body. */
4899         set_cur_block(body_block);
4900         statement_to_firm(statement->body);
4901         jump_if_reachable(step_block);
4902
4903         /* Create the step code. */
4904         if (step != NULL) {
4905                 mature_immBlock(step_block);
4906                 set_cur_block(step_block);
4907                 expression_to_firm(step);
4908                 jump_if_reachable(header_block);
4909         }
4910
4911         mature_immBlock(header_block);
4912         assert(false_block == NULL || false_block == break_label);
4913         false_block = break_label;
4914         if (false_block != NULL) {
4915                 mature_immBlock(false_block);
4916         }
4917         set_cur_block(false_block);
4918
4919         assert(continue_label == step_block);
4920         continue_label = old_continue_label;
4921         break_label    = old_break_label;
4922         return NULL;
4923 }
4924
4925 static ir_node *create_jump_statement(const statement_t *statement, ir_node *target_block)
4926 {
4927         if (!currently_reachable())
4928                 return NULL;
4929
4930         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
4931         ir_node  *jump = new_d_Jmp(dbgi);
4932         add_immBlock_pred(target_block, jump);
4933
4934         set_unreachable_now();
4935         return NULL;
4936 }
4937
4938 static ir_switch_table *create_switch_table(const switch_statement_t *statement)
4939 {
4940         /* determine number of cases */
4941         size_t n_cases = 0;
4942         for (case_label_statement_t *l = statement->first_case; l != NULL;
4943              l = l->next) {
4944                 /* default case */
4945                 if (l->expression == NULL)
4946                         continue;
4947                 if (l->is_empty_range)
4948                         continue;
4949                 ++n_cases;
4950         }
4951
4952         ir_switch_table *res = ir_new_switch_table(current_ir_graph, n_cases);
4953         size_t           i   = 0;
4954         for (case_label_statement_t *l = statement->first_case; l != NULL;
4955              l = l->next) {
4956             if (l->expression == NULL) {
4957                         l->pn = pn_Switch_default;
4958                         continue;
4959                 }
4960                 if (l->is_empty_range)
4961                         continue;
4962                 ir_tarval *min = fold_constant_to_tarval(l->expression);
4963                 ir_tarval *max = min;
4964                 long       pn  = (long) i+1;
4965                 if (l->end_range != NULL)
4966                         max = fold_constant_to_tarval(l->end_range);
4967                 ir_switch_table_set(res, i++, min, max, pn);
4968                 l->pn = pn;
4969         }
4970         return res;
4971 }
4972
4973 static ir_node *switch_statement_to_firm(switch_statement_t *statement)
4974 {
4975         dbg_info *dbgi        = get_dbg_info(&statement->base.source_position);
4976         ir_node  *switch_node = NULL;
4977
4978         if (currently_reachable()) {
4979                 ir_node *expression = expression_to_firm(statement->expression);
4980                 ir_switch_table *table = create_switch_table(statement);
4981                 unsigned n_outs = (unsigned)ir_switch_table_get_n_entries(table) + 1;
4982
4983                 switch_node = new_d_Switch(dbgi, expression, n_outs, table);
4984         }
4985
4986         set_unreachable_now();
4987
4988         ir_node *const old_switch            = current_switch;
4989         ir_node *const old_break_label       = break_label;
4990         const bool     old_saw_default_label = saw_default_label;
4991         saw_default_label                    = false;
4992         current_switch                       = switch_node;
4993         break_label                          = NULL;
4994
4995         statement_to_firm(statement->body);
4996
4997         if (currently_reachable()) {
4998                 add_immBlock_pred(get_break_label(), new_Jmp());
4999         }
5000
5001         if (!saw_default_label && switch_node) {
5002                 ir_node *proj = new_d_Proj(dbgi, switch_node, mode_X, pn_Switch_default);
5003                 add_immBlock_pred(get_break_label(), proj);
5004         }
5005
5006         if (break_label != NULL) {
5007                 mature_immBlock(break_label);
5008         }
5009         set_cur_block(break_label);
5010
5011         assert(current_switch == switch_node);
5012         current_switch    = old_switch;
5013         break_label       = old_break_label;
5014         saw_default_label = old_saw_default_label;
5015         return NULL;
5016 }
5017
5018 static ir_node *case_label_to_firm(const case_label_statement_t *statement)
5019 {
5020         if (statement->is_empty_range)
5021                 return NULL;
5022
5023         if (current_switch != NULL) {
5024                 ir_node *block = new_immBlock();
5025                 /* Fallthrough from previous case */
5026                 jump_if_reachable(block);
5027
5028                 ir_node  *const proj = new_Proj(current_switch, mode_X, statement->pn);
5029                 add_immBlock_pred(block, proj);
5030                 if (statement->expression == NULL)
5031                         saw_default_label = true;
5032
5033                 mature_immBlock(block);
5034                 set_cur_block(block);
5035         }
5036
5037         return statement_to_firm(statement->statement);
5038 }
5039
5040 static ir_node *label_to_firm(const label_statement_t *statement)
5041 {
5042         ir_node *block = get_label_block(statement->label);
5043         jump_to(block);
5044
5045         set_cur_block(block);
5046         keep_alive(block);
5047         keep_all_memory(block);
5048
5049         return statement_to_firm(statement->statement);
5050 }
5051
5052 static ir_node *computed_goto_to_firm(computed_goto_statement_t const *const statement)
5053 {
5054         if (!currently_reachable())
5055                 return NULL;
5056
5057         ir_node  *const irn  = expression_to_firm(statement->expression);
5058         dbg_info *const dbgi = get_dbg_info(&statement->base.source_position);
5059         ir_node  *const ijmp = new_d_IJmp(dbgi, irn);
5060
5061         set_irn_link(ijmp, ijmp_list);
5062         ijmp_list = ijmp;
5063
5064         set_unreachable_now();
5065         return NULL;
5066 }
5067
5068 static ir_node *asm_statement_to_firm(const asm_statement_t *statement)
5069 {
5070         bool needs_memory = false;
5071
5072         if (statement->is_volatile) {
5073                 needs_memory = true;
5074         }
5075
5076         size_t         n_clobbers = 0;
5077         asm_clobber_t *clobber    = statement->clobbers;
5078         for ( ; clobber != NULL; clobber = clobber->next) {
5079                 const char *clobber_str = clobber->clobber.begin;
5080
5081                 if (!be_is_valid_clobber(clobber_str)) {
5082                         errorf(&statement->base.source_position,
5083                                    "invalid clobber '%s' specified", clobber->clobber);
5084                         continue;
5085                 }
5086
5087                 if (streq(clobber_str, "memory")) {
5088                         needs_memory = true;
5089                         continue;
5090                 }
5091
5092                 ident *id = new_id_from_str(clobber_str);
5093                 obstack_ptr_grow(&asm_obst, id);
5094                 ++n_clobbers;
5095         }
5096         assert(obstack_object_size(&asm_obst) == n_clobbers * sizeof(ident*));
5097         ident **clobbers = NULL;
5098         if (n_clobbers > 0) {
5099                 clobbers = obstack_finish(&asm_obst);
5100         }
5101
5102         size_t n_inputs  = 0;
5103         asm_argument_t *argument = statement->inputs;
5104         for ( ; argument != NULL; argument = argument->next)
5105                 n_inputs++;
5106         size_t n_outputs = 0;
5107         argument = statement->outputs;
5108         for ( ; argument != NULL; argument = argument->next)
5109                 n_outputs++;
5110
5111         unsigned next_pos = 0;
5112
5113         ir_node *ins[n_inputs + n_outputs + 1];
5114         size_t   in_size = 0;
5115
5116         ir_asm_constraint tmp_in_constraints[n_outputs];
5117
5118         const expression_t *out_exprs[n_outputs];
5119         ir_node            *out_addrs[n_outputs];
5120         size_t              out_size = 0;
5121
5122         argument = statement->outputs;
5123         for ( ; argument != NULL; argument = argument->next) {
5124                 const char *constraints = argument->constraints.begin;
5125                 asm_constraint_flags_t asm_flags
5126                         = be_parse_asm_constraints(constraints);
5127
5128                 {
5129                         source_position_t const *const pos = &statement->base.source_position;
5130                         if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
5131                                 warningf(WARN_OTHER, pos, "some constraints in '%s' are not supported", constraints);
5132                         }
5133                         if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
5134                                 errorf(pos, "some constraints in '%s' are invalid", constraints);
5135                                 continue;
5136                         }
5137                         if (! (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE)) {
5138                                 errorf(pos, "no write flag specified for output constraints '%s'", constraints);
5139                                 continue;
5140                         }
5141                 }
5142
5143                 unsigned pos = next_pos++;
5144                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
5145                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
5146                         expression_t *expr = argument->expression;
5147                         ir_node      *addr = expression_to_addr(expr);
5148                         /* in+output, construct an artifical same_as constraint on the
5149                          * input */
5150                         if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_READ) {
5151                                 char     buf[64];
5152                                 ir_node *value = get_value_from_lvalue(expr, addr);
5153
5154                                 snprintf(buf, sizeof(buf), "%u", (unsigned) out_size);
5155
5156                                 ir_asm_constraint constraint;
5157                                 constraint.pos              = pos;
5158                                 constraint.constraint       = new_id_from_str(buf);
5159                                 constraint.mode             = get_ir_mode_storage(expr->base.type);
5160                                 tmp_in_constraints[in_size] = constraint;
5161                                 ins[in_size] = value;
5162
5163                                 ++in_size;
5164                         }
5165
5166                         out_exprs[out_size] = expr;
5167                         out_addrs[out_size] = addr;
5168                         ++out_size;
5169                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
5170                         /* pure memory ops need no input (but we have to make sure we
5171                          * attach to the memory) */
5172                         assert(! (asm_flags &
5173                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
5174                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
5175                         needs_memory = true;
5176
5177                         /* we need to attach the address to the inputs */
5178                         expression_t *expr = argument->expression;
5179
5180                         ir_asm_constraint constraint;
5181                         constraint.pos              = pos;
5182                         constraint.constraint       = new_id_from_str(constraints);
5183                         constraint.mode             = mode_M;
5184                         tmp_in_constraints[in_size] = constraint;
5185
5186                         ins[in_size]          = expression_to_addr(expr);
5187                         ++in_size;
5188                         continue;
5189                 } else {
5190                         errorf(&statement->base.source_position,
5191                                "only modifiers but no place set in constraints '%s'",
5192                                constraints);
5193                         continue;
5194                 }
5195
5196                 ir_asm_constraint constraint;
5197                 constraint.pos        = pos;
5198                 constraint.constraint = new_id_from_str(constraints);
5199                 constraint.mode       = get_ir_mode_storage(argument->expression->base.type);
5200
5201                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5202         }
5203         assert(obstack_object_size(&asm_obst)
5204                         == out_size * sizeof(ir_asm_constraint));
5205         ir_asm_constraint *output_constraints = obstack_finish(&asm_obst);
5206
5207
5208         obstack_grow(&asm_obst, tmp_in_constraints,
5209                      in_size * sizeof(tmp_in_constraints[0]));
5210         /* find and count input and output arguments */
5211         argument = statement->inputs;
5212         for ( ; argument != NULL; argument = argument->next) {
5213                 const char *constraints = argument->constraints.begin;
5214                 asm_constraint_flags_t asm_flags
5215                         = be_parse_asm_constraints(constraints);
5216
5217                 if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
5218                         errorf(&statement->base.source_position,
5219                                "some constraints in '%s' are not supported", constraints);
5220                         continue;
5221                 }
5222                 if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
5223                         errorf(&statement->base.source_position,
5224                                "some constraints in '%s' are invalid", constraints);
5225                         continue;
5226                 }
5227                 if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE) {
5228                         errorf(&statement->base.source_position,
5229                                "write flag specified for input constraints '%s'",
5230                                constraints);
5231                         continue;
5232                 }
5233
5234                 ir_node *input;
5235                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
5236                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
5237                         /* we can treat this as "normal" input */
5238                         input = expression_to_firm(argument->expression);
5239                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
5240                         /* pure memory ops need no input (but we have to make sure we
5241                          * attach to the memory) */
5242                         assert(! (asm_flags &
5243                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
5244                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
5245                         needs_memory = true;
5246                         input = expression_to_addr(argument->expression);
5247                 } else {
5248                         errorf(&statement->base.source_position,
5249                                "only modifiers but no place set in constraints '%s'",
5250                                constraints);
5251                         continue;
5252                 }
5253
5254                 ir_asm_constraint constraint;
5255                 constraint.pos        = next_pos++;
5256                 constraint.constraint = new_id_from_str(constraints);
5257                 constraint.mode       = get_irn_mode(input);
5258
5259                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5260                 ins[in_size++] = input;
5261         }
5262
5263         if (needs_memory) {
5264                 ir_asm_constraint constraint;
5265                 constraint.pos        = next_pos++;
5266                 constraint.constraint = new_id_from_str("");
5267                 constraint.mode       = mode_M;
5268
5269                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5270                 ins[in_size++] = get_store();
5271         }
5272
5273         assert(obstack_object_size(&asm_obst)
5274                         == in_size * sizeof(ir_asm_constraint));
5275         ir_asm_constraint *input_constraints = obstack_finish(&asm_obst);
5276
5277         /* create asm node */
5278         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
5279
5280         ident *asm_text = new_id_from_str(statement->asm_text.begin);
5281
5282         ir_node *node = new_d_ASM(dbgi, in_size, ins, input_constraints,
5283                                   out_size, output_constraints,
5284                                   n_clobbers, clobbers, asm_text);
5285
5286         if (statement->is_volatile) {
5287                 set_irn_pinned(node, op_pin_state_pinned);
5288         } else {
5289                 set_irn_pinned(node, op_pin_state_floats);
5290         }
5291
5292         /* create output projs & connect them */
5293         if (needs_memory) {
5294                 ir_node *projm = new_Proj(node, mode_M, out_size);
5295                 set_store(projm);
5296         }
5297
5298         size_t i;
5299         for (i = 0; i < out_size; ++i) {
5300                 const expression_t *out_expr = out_exprs[i];
5301                 long                pn       = i;
5302                 ir_mode            *mode     = get_ir_mode_storage(out_expr->base.type);
5303                 ir_node            *proj     = new_Proj(node, mode, pn);
5304                 ir_node            *addr     = out_addrs[i];
5305
5306                 set_value_for_expression_addr(out_expr, proj, addr);
5307         }
5308
5309         return NULL;
5310 }
5311
5312 static ir_node *ms_try_statement_to_firm(ms_try_statement_t *statement)
5313 {
5314         statement_to_firm(statement->try_statement);
5315         source_position_t const *const pos = &statement->base.source_position;
5316         warningf(WARN_OTHER, pos, "structured exception handling ignored");
5317         return NULL;
5318 }
5319
5320 static ir_node *leave_statement_to_firm(leave_statement_t *statement)
5321 {
5322         errorf(&statement->base.source_position, "__leave not supported yet");
5323         return NULL;
5324 }
5325
5326 /**
5327  * Transform a statement.
5328  */
5329 static ir_node *statement_to_firm(statement_t *const stmt)
5330 {
5331 #ifndef NDEBUG
5332         assert(!stmt->base.transformed);
5333         stmt->base.transformed = true;
5334 #endif
5335
5336         switch (stmt->kind) {
5337         case STATEMENT_ASM:           return asm_statement_to_firm(        &stmt->asms);
5338         case STATEMENT_CASE_LABEL:    return case_label_to_firm(           &stmt->case_label);
5339         case STATEMENT_COMPOUND:      return compound_statement_to_firm(   &stmt->compound);
5340         case STATEMENT_COMPUTED_GOTO: return computed_goto_to_firm(        &stmt->computed_goto);
5341         case STATEMENT_DECLARATION:   return declaration_statement_to_firm(&stmt->declaration);
5342         case STATEMENT_DO_WHILE:      return do_while_statement_to_firm(   &stmt->do_while);
5343         case STATEMENT_EMPTY:         return NULL; /* nothing */
5344         case STATEMENT_EXPRESSION:    return expression_statement_to_firm( &stmt->expression);
5345         case STATEMENT_FOR:           return for_statement_to_firm(        &stmt->fors);
5346         case STATEMENT_IF:            return if_statement_to_firm(         &stmt->ifs);
5347         case STATEMENT_LABEL:         return label_to_firm(                &stmt->label);
5348         case STATEMENT_LEAVE:         return leave_statement_to_firm(      &stmt->leave);
5349         case STATEMENT_MS_TRY:        return ms_try_statement_to_firm(     &stmt->ms_try);
5350         case STATEMENT_RETURN:        return return_statement_to_firm(     &stmt->returns);
5351         case STATEMENT_SWITCH:        return switch_statement_to_firm(     &stmt->switchs);
5352         case STATEMENT_WHILE:         return while_statement_to_firm(      &stmt->whiles);
5353
5354         case STATEMENT_BREAK:         return create_jump_statement(stmt, get_break_label());
5355         case STATEMENT_CONTINUE:      return create_jump_statement(stmt, continue_label);
5356         case STATEMENT_GOTO:          return create_jump_statement(stmt, get_label_block(stmt->gotos.label));
5357
5358         case STATEMENT_ERROR: panic("error statement found");
5359         }
5360         panic("statement not implemented");
5361 }
5362
5363 static int count_local_variables(const entity_t *entity,
5364                                  const entity_t *const last)
5365 {
5366         int count = 0;
5367         entity_t const *const end = last != NULL ? last->base.next : NULL;
5368         for (; entity != end; entity = entity->base.next) {
5369                 type_t *type;
5370                 bool    address_taken;
5371
5372                 if (entity->kind == ENTITY_VARIABLE) {
5373                         type          = skip_typeref(entity->declaration.type);
5374                         address_taken = entity->variable.address_taken;
5375                 } else if (entity->kind == ENTITY_PARAMETER) {
5376                         type          = skip_typeref(entity->declaration.type);
5377                         address_taken = entity->parameter.address_taken;
5378                 } else {
5379                         continue;
5380                 }
5381
5382                 if (!address_taken && is_type_scalar(type))
5383                         ++count;
5384         }
5385         return count;
5386 }
5387
5388 static void count_local_variables_in_stmt(statement_t *stmt, void *const env)
5389 {
5390         int *const count = env;
5391
5392         switch (stmt->kind) {
5393         case STATEMENT_DECLARATION: {
5394                 const declaration_statement_t *const decl_stmt = &stmt->declaration;
5395                 *count += count_local_variables(decl_stmt->declarations_begin,
5396                                 decl_stmt->declarations_end);
5397                 break;
5398         }
5399
5400         case STATEMENT_FOR:
5401                 *count += count_local_variables(stmt->fors.scope.entities, NULL);
5402                 break;
5403
5404         default:
5405                 break;
5406         }
5407 }
5408
5409 /**
5410  * Return the number of local (alias free) variables used by a function.
5411  */
5412 static int get_function_n_local_vars(entity_t *entity)
5413 {
5414         const function_t *function = &entity->function;
5415         int count = 0;
5416
5417         /* count parameters */
5418         count += count_local_variables(function->parameters.entities, NULL);
5419
5420         /* count local variables declared in body */
5421         walk_statements(function->statement, count_local_variables_in_stmt, &count);
5422         return count;
5423 }
5424
5425 /**
5426  * Build Firm code for the parameters of a function.
5427  */
5428 static void initialize_function_parameters(entity_t *entity)
5429 {
5430         assert(entity->kind == ENTITY_FUNCTION);
5431         ir_graph *irg             = current_ir_graph;
5432         ir_node  *args            = get_irg_args(irg);
5433         int       n               = 0;
5434         ir_type  *function_irtype;
5435
5436         if (entity->function.need_closure) {
5437                 /* add an extra parameter for the static link */
5438                 entity->function.static_link = new_r_Proj(args, mode_P_data, 0);
5439                 ++n;
5440
5441                 /* Matze: IMO this is wrong, nested functions should have an own
5442                  * type and not rely on strange parameters... */
5443                 function_irtype = create_method_type(&entity->declaration.type->function, true);
5444         } else {
5445                 function_irtype = get_ir_type(entity->declaration.type);
5446         }
5447
5448
5449
5450         entity_t *parameter = entity->function.parameters.entities;
5451         for ( ; parameter != NULL; parameter = parameter->base.next, ++n) {
5452                 if (parameter->kind != ENTITY_PARAMETER)
5453                         continue;
5454
5455                 assert(parameter->declaration.kind == DECLARATION_KIND_UNKNOWN);
5456                 type_t *type = skip_typeref(parameter->declaration.type);
5457
5458                 bool needs_entity = parameter->parameter.address_taken;
5459                 assert(!is_type_array(type));
5460                 if (is_type_compound(type)) {
5461                         needs_entity = true;
5462                 }
5463
5464                 ir_type *param_irtype = get_method_param_type(function_irtype, n);
5465                 if (needs_entity) {
5466                         ir_type   *frame_type = get_irg_frame_type(irg);
5467                         ir_entity *param
5468                                 = new_parameter_entity(frame_type, n, param_irtype);
5469                         parameter->declaration.kind
5470                                 = DECLARATION_KIND_PARAMETER_ENTITY;
5471                         parameter->parameter.v.entity = param;
5472                         continue;
5473                 }
5474
5475                 ir_mode *param_mode = get_type_mode(param_irtype);
5476                 long     pn         = n;
5477                 ir_node *value      = new_r_Proj(args, param_mode, pn);
5478
5479                 ir_mode *mode = get_ir_mode_storage(type);
5480                 value = create_conv(NULL, value, mode);
5481                 value = do_strict_conv(NULL, value);
5482
5483                 parameter->declaration.kind         = DECLARATION_KIND_PARAMETER;
5484                 parameter->parameter.v.value_number = next_value_number_function;
5485                 set_irg_loc_description(current_ir_graph, next_value_number_function,
5486                                         parameter);
5487                 ++next_value_number_function;
5488
5489                 set_value(parameter->parameter.v.value_number, value);
5490         }
5491 }
5492
5493 /**
5494  * Handle additional decl modifiers for IR-graphs
5495  *
5496  * @param irg            the IR-graph
5497  * @param dec_modifiers  additional modifiers
5498  */
5499 static void handle_decl_modifier_irg(ir_graph *irg,
5500                                      decl_modifiers_t decl_modifiers)
5501 {
5502         if (decl_modifiers & DM_NAKED) {
5503                 /* TRUE if the declaration includes the Microsoft
5504                    __declspec(naked) specifier. */
5505                 add_irg_additional_properties(irg, mtp_property_naked);
5506         }
5507         if (decl_modifiers & DM_FORCEINLINE) {
5508                 /* TRUE if the declaration includes the
5509                    Microsoft __forceinline specifier. */
5510                 set_irg_inline_property(irg, irg_inline_forced);
5511         }
5512         if (decl_modifiers & DM_NOINLINE) {
5513                 /* TRUE if the declaration includes the Microsoft
5514                    __declspec(noinline) specifier. */
5515                 set_irg_inline_property(irg, irg_inline_forbidden);
5516         }
5517 }
5518
5519 static void add_function_pointer(ir_type *segment, ir_entity *method,
5520                                  const char *unique_template)
5521 {
5522         ir_type   *method_type  = get_entity_type(method);
5523         ir_type   *ptr_type     = new_type_pointer(method_type);
5524
5525         /* these entities don't really have a name but firm only allows
5526          * "" in ld_ident.
5527          * Note that we mustn't give these entities a name since for example
5528          * Mach-O doesn't allow them. */
5529         ident     *ide          = id_unique(unique_template);
5530         ir_entity *ptr          = new_entity(segment, ide, ptr_type);
5531         ir_graph  *irg          = get_const_code_irg();
5532         ir_node   *val          = new_rd_SymConst_addr_ent(NULL, irg, mode_P_code,
5533                                                            method);
5534
5535         set_entity_ld_ident(ptr, new_id_from_chars("", 0));
5536         set_entity_compiler_generated(ptr, 1);
5537         set_entity_visibility(ptr, ir_visibility_private);
5538         add_entity_linkage(ptr, IR_LINKAGE_CONSTANT|IR_LINKAGE_HIDDEN_USER);
5539         set_atomic_ent_value(ptr, val);
5540 }
5541
5542 /**
5543  * Generate possible IJmp branches to a given label block.
5544  */
5545 static void gen_ijmp_branches(ir_node *block)
5546 {
5547         ir_node *ijmp;
5548         for (ijmp = ijmp_list; ijmp != NULL; ijmp = get_irn_link(ijmp)) {
5549                 add_immBlock_pred(block, ijmp);
5550         }
5551 }
5552
5553 /**
5554  * Create code for a function and all inner functions.
5555  *
5556  * @param entity  the function entity
5557  */
5558 static void create_function(entity_t *entity)
5559 {
5560         assert(entity->kind == ENTITY_FUNCTION);
5561         ir_entity *function_entity = get_function_entity(entity, current_outer_frame);
5562
5563         if (entity->function.statement == NULL)
5564                 return;
5565
5566         inner_functions     = NULL;
5567         current_trampolines = NULL;
5568
5569         if (entity->declaration.modifiers & DM_CONSTRUCTOR) {
5570                 ir_type *segment = get_segment_type(IR_SEGMENT_CONSTRUCTORS);
5571                 add_function_pointer(segment, function_entity, "constructor_ptr.%u");
5572         }
5573         if (entity->declaration.modifiers & DM_DESTRUCTOR) {
5574                 ir_type *segment = get_segment_type(IR_SEGMENT_DESTRUCTORS);
5575                 add_function_pointer(segment, function_entity, "destructor_ptr.%u");
5576         }
5577
5578         current_function_entity = entity;
5579         current_function_name   = NULL;
5580         current_funcsig         = NULL;
5581
5582         assert(all_labels == NULL);
5583         all_labels = NEW_ARR_F(label_t *, 0);
5584         ijmp_list  = NULL;
5585
5586         int       n_local_vars = get_function_n_local_vars(entity);
5587         ir_graph *irg          = new_ir_graph(function_entity, n_local_vars);
5588         current_ir_graph = irg;
5589
5590         ir_graph *old_current_function = current_function;
5591         current_function = irg;
5592
5593         ir_entity *const old_current_vararg_entity = current_vararg_entity;
5594         current_vararg_entity = NULL;
5595
5596         set_irg_fp_model(irg, firm_fp_model);
5597         tarval_enable_fp_ops(1);
5598         set_irn_dbg_info(get_irg_start_block(irg),
5599                          get_entity_dbg_info(function_entity));
5600
5601         /* set inline flags */
5602         if (entity->function.is_inline)
5603                 set_irg_inline_property(irg, irg_inline_recomended);
5604         handle_decl_modifier_irg(irg, entity->declaration.modifiers);
5605
5606         next_value_number_function = 0;
5607         initialize_function_parameters(entity);
5608         current_static_link = entity->function.static_link;
5609
5610         statement_to_firm(entity->function.statement);
5611
5612         ir_node *end_block = get_irg_end_block(irg);
5613
5614         /* do we have a return statement yet? */
5615         if (currently_reachable()) {
5616                 type_t *type = skip_typeref(entity->declaration.type);
5617                 assert(is_type_function(type));
5618                 const function_type_t *func_type   = &type->function;
5619                 const type_t          *return_type
5620                         = skip_typeref(func_type->return_type);
5621
5622                 ir_node *ret;
5623                 if (is_type_void(return_type)) {
5624                         ret = new_Return(get_store(), 0, NULL);
5625                 } else {
5626                         ir_mode *mode;
5627                         if (is_type_scalar(return_type)) {
5628                                 mode = get_ir_mode_storage(func_type->return_type);
5629                         } else {
5630                                 mode = mode_P_data;
5631                         }
5632
5633                         ir_node *in[1];
5634                         /* §5.1.2.2.3 main implicitly returns 0 */
5635                         if (is_main(entity)) {
5636                                 in[0] = new_Const(get_mode_null(mode));
5637                         } else {
5638                                 in[0] = new_Unknown(mode);
5639                         }
5640                         ret = new_Return(get_store(), 1, in);
5641                 }
5642                 add_immBlock_pred(end_block, ret);
5643         }
5644
5645         for (int i = ARR_LEN(all_labels) - 1; i >= 0; --i) {
5646                 label_t *label = all_labels[i];
5647                 if (label->address_taken) {
5648                         gen_ijmp_branches(label->block);
5649                 }
5650                 mature_immBlock(label->block);
5651         }
5652
5653         DEL_ARR_F(all_labels);
5654         all_labels = NULL;
5655
5656         irg_finalize_cons(irg);
5657
5658         /* finalize the frame type */
5659         ir_type *frame_type = get_irg_frame_type(irg);
5660         int      n          = get_compound_n_members(frame_type);
5661         int      align_all  = 4;
5662         int      offset     = 0;
5663         for (int i = 0; i < n; ++i) {
5664                 ir_entity *member      = get_compound_member(frame_type, i);
5665                 ir_type   *entity_type = get_entity_type(member);
5666
5667                 int align = get_type_alignment_bytes(entity_type);
5668                 if (align > align_all)
5669                         align_all = align;
5670                 int misalign = 0;
5671                 if (align > 0) {
5672                         misalign  = offset % align;
5673                         if (misalign > 0) {
5674                                 offset += align - misalign;
5675                         }
5676                 }
5677
5678                 set_entity_offset(member, offset);
5679                 offset += get_type_size_bytes(entity_type);
5680         }
5681         set_type_size_bytes(frame_type, offset);
5682         set_type_alignment_bytes(frame_type, align_all);
5683
5684         irg_verify(irg, VERIFY_ENFORCE_SSA);
5685         current_vararg_entity = old_current_vararg_entity;
5686         current_function      = old_current_function;
5687
5688         if (current_trampolines != NULL) {
5689                 DEL_ARR_F(current_trampolines);
5690                 current_trampolines = NULL;
5691         }
5692
5693         /* create inner functions if any */
5694         entity_t **inner = inner_functions;
5695         if (inner != NULL) {
5696                 ir_type *rem_outer_frame      = current_outer_frame;
5697                 current_outer_frame           = get_irg_frame_type(current_ir_graph);
5698                 for (int i = ARR_LEN(inner) - 1; i >= 0; --i) {
5699                         create_function(inner[i]);
5700                 }
5701                 DEL_ARR_F(inner);
5702
5703                 current_outer_frame      = rem_outer_frame;
5704         }
5705 }
5706
5707 static void scope_to_firm(scope_t *scope)
5708 {
5709         /* first pass: create declarations */
5710         entity_t *entity = scope->entities;
5711         for ( ; entity != NULL; entity = entity->base.next) {
5712                 if (entity->base.symbol == NULL)
5713                         continue;
5714
5715                 if (entity->kind == ENTITY_FUNCTION) {
5716                         if (entity->function.btk != BUILTIN_NONE) {
5717                                 /* builtins have no representation */
5718                                 continue;
5719                         }
5720                         (void)get_function_entity(entity, NULL);
5721                 } else if (entity->kind == ENTITY_VARIABLE) {
5722                         create_global_variable(entity);
5723                 } else if (entity->kind == ENTITY_NAMESPACE) {
5724                         scope_to_firm(&entity->namespacee.members);
5725                 }
5726         }
5727
5728         /* second pass: create code/initializers */
5729         entity = scope->entities;
5730         for ( ; entity != NULL; entity = entity->base.next) {
5731                 if (entity->base.symbol == NULL)
5732                         continue;
5733
5734                 if (entity->kind == ENTITY_FUNCTION) {
5735                         if (entity->function.btk != BUILTIN_NONE) {
5736                                 /* builtins have no representation */
5737                                 continue;
5738                         }
5739                         create_function(entity);
5740                 } else if (entity->kind == ENTITY_VARIABLE) {
5741                         assert(entity->declaration.kind
5742                                         == DECLARATION_KIND_GLOBAL_VARIABLE);
5743                         current_ir_graph = get_const_code_irg();
5744                         create_variable_initializer(entity);
5745                 }
5746         }
5747 }
5748
5749 void init_ast2firm(void)
5750 {
5751         obstack_init(&asm_obst);
5752         init_atomic_modes();
5753
5754         ir_set_debug_retrieve(dbg_retrieve);
5755         ir_set_type_debug_retrieve(dbg_print_type_dbg_info);
5756
5757         /* create idents for all known runtime functions */
5758         for (size_t i = 0; i < lengthof(rts_data); ++i) {
5759                 rts_idents[i] = new_id_from_str(rts_data[i].name);
5760         }
5761
5762         entitymap_init(&entitymap);
5763 }
5764
5765 static void init_ir_types(void)
5766 {
5767         static int ir_types_initialized = 0;
5768         if (ir_types_initialized)
5769                 return;
5770         ir_types_initialized = 1;
5771
5772         ir_type_char       = get_ir_type(type_char);
5773         ir_type_const_char = get_ir_type(type_const_char);
5774         ir_type_wchar_t    = get_ir_type(type_wchar_t);
5775
5776         be_params             = be_get_backend_param();
5777         mode_float_arithmetic = be_params->mode_float_arithmetic;
5778
5779         stack_param_align     = be_params->stack_param_align;
5780 }
5781
5782 void exit_ast2firm(void)
5783 {
5784         entitymap_destroy(&entitymap);
5785         obstack_free(&asm_obst, NULL);
5786 }
5787
5788 static void global_asm_to_firm(statement_t *s)
5789 {
5790         for (; s != NULL; s = s->base.next) {
5791                 assert(s->kind == STATEMENT_ASM);
5792
5793                 char const *const text = s->asms.asm_text.begin;
5794                 size_t            size = s->asms.asm_text.size;
5795
5796                 /* skip the last \0 */
5797                 if (text[size - 1] == '\0')
5798                         --size;
5799
5800                 ident *const id = new_id_from_chars(text, size);
5801                 add_irp_asm(id);
5802         }
5803 }
5804
5805 void translation_unit_to_firm(translation_unit_t *unit)
5806 {
5807         /* initialize firm arithmetic */
5808         tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
5809         ir_set_uninitialized_local_variable_func(uninitialized_local_var);
5810
5811         /* just to be sure */
5812         continue_label           = NULL;
5813         break_label              = NULL;
5814         current_switch           = NULL;
5815         current_translation_unit = unit;
5816
5817         init_ir_types();
5818
5819         scope_to_firm(&unit->scope);
5820         global_asm_to_firm(unit->global_asm);
5821
5822         current_ir_graph         = NULL;
5823         current_translation_unit = NULL;
5824 }