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 <unistd.h>
  26 #include <limits.h>
  27
  28 #include <libfirm/firm.h>
  29 #include <libfirm/adt/obst.h>
  30 #include <libfirm/be.h>
  31
  32 #include "ast2firm.h"
  33
  34 #include "adt/error.h"
  35 #include "adt/array.h"
  36 #include "adt/strutil.h"
  37 #include "adt/util.h"
  38 #include "symbol_t.h"
  39 #include "token_t.h"
  40 #include "type_t.h"
  41 #include "ast_t.h"
  42 #include "entity_t.h"
  43 #include "parser.h"
  44 #include "diagnostic.h"
  45 #include "lang_features.h"
  46 #include "types.h"
  47 #include "type_hash.h"
  48 #include "mangle.h"
  49 #include "walk.h"
  50 #include "warning.h"
  51 #include "printer.h"
  52 #include "entitymap_t.h"
  53 #include "driver/firm_opt.h"
  54
  55 typedef struct trampoline_region trampoline_region;
  56 struct trampoline_region {
  57         ir_entity        *function;    /**< The function that is called by this trampoline */
  58         ir_entity        *region;      /**< created region for the trampoline */
  59 };
  60
  61 fp_model_t firm_fp_model = fp_model_precise;
  62
  63 static const backend_params *be_params;
  64
  65 static ir_type *ir_type_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 src_loc_t dbg_retrieve(const dbg_info *dbg)
 132 {
 133         source_position_t const *const pos = (source_position_t const*)dbg;
 134         if (pos) {
 135                 return (src_loc_t){ pos->input_name, pos->lineno, pos->colno };
 136         } else {
 137                 return (src_loc_t){ NULL, 0, 0 };
 138         }
 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
 178 static unsigned decide_modulo_shift(unsigned type_size)
 179 {
 180         if (architecture_modulo_shift == 0)
 181                 return 0;
 182         if (type_size < architecture_modulo_shift)
 183                 return architecture_modulo_shift;
 184         return type_size;
 185 }
 186
 187 static ir_mode *init_atomic_ir_mode(atomic_type_kind_t kind)
 188 {
 189         unsigned flags = get_atomic_type_flags(kind);
 190         unsigned size  = get_atomic_type_size(kind);
 191         if ((flags & ATOMIC_TYPE_FLAG_FLOAT)
 192             && !(flags & ATOMIC_TYPE_FLAG_COMPLEX)) {
 193                 switch (size) {
 194                 case 4:  return get_modeF();
 195                 case 8:  return get_modeD();
 196                 default: panic("unexpected kind");
 197                 }
 198         } else if (flags & ATOMIC_TYPE_FLAG_INTEGER) {
 199                 char            name[64];
 200                 unsigned        bit_size     = size * 8;
 201                 bool            is_signed    = (flags & ATOMIC_TYPE_FLAG_SIGNED) != 0;
 202                 unsigned        modulo_shift = decide_modulo_shift(bit_size);
 203
 204                 snprintf(name, sizeof(name), "%s%u", is_signed ? "I" : "U", bit_size);
 205                 return new_int_mode(name, irma_twos_complement, bit_size, is_signed,
 206                                     modulo_shift);
 207         }
 208
 209         return NULL;
 210 }
 211
 212 /**
 213  * Initialises the atomic modes depending on the machine size.
 214  */
 215 static void init_atomic_modes(void)
 216 {
 217         atomic_modes[ATOMIC_TYPE_VOID] = mode_ANY;
 218         for (int i = 0; i <= ATOMIC_TYPE_LAST; ++i) {
 219                 if (atomic_modes[i] != NULL)
 220                         continue;
 221                 atomic_modes[i] = init_atomic_ir_mode((atomic_type_kind_t) i);
 222         }
 223 }
 224
 225 ir_mode *get_atomic_mode(atomic_type_kind_t kind)
 226 {
 227         assert(kind <= ATOMIC_TYPE_LAST);
 228         return atomic_modes[kind];
 229 }
 230
 231 static ir_node *get_vla_size(array_type_t *const type)
 232 {
 233         ir_node *size_node = type->size_node;
 234         if (size_node == NULL) {
 235                 size_node = expression_to_firm(type->size_expression);
 236                 type->size_node = size_node;
 237         }
 238         return size_node;
 239 }
 240
 241 static unsigned count_parameters(const function_type_t *function_type)
 242 {
 243         unsigned count = 0;
 244
 245         function_parameter_t *parameter = function_type->parameters;
 246         for ( ; parameter != NULL; parameter = parameter->next) {
 247                 ++count;
 248         }
 249
 250         return count;
 251 }
 252
 253 /**
 254  * Creates a Firm type for an atomic type
 255  */
 256 static ir_type *create_atomic_type(atomic_type_kind_t akind, const type_t *type)
 257 {
 258         ir_mode        *mode      = atomic_modes[akind];
 259         type_dbg_info  *dbgi      = get_type_dbg_info_(type);
 260         ir_type        *irtype    = new_d_type_primitive(mode, dbgi);
 261         il_alignment_t  alignment = get_atomic_type_alignment(akind);
 262
 263         set_type_size_bytes(irtype, get_atomic_type_size(akind));
 264         set_type_alignment_bytes(irtype, alignment);
 265
 266         return irtype;
 267 }
 268
 269 /**
 270  * Creates a Firm type for a complex type
 271  */
 272 static ir_type *create_complex_type(const atomic_type_t *type)
 273 {
 274         atomic_type_kind_t  kind = type->akind;
 275         ir_mode            *mode = atomic_modes[kind];
 276         ident              *id   = get_mode_ident(mode);
 277
 278         (void) id;
 279
 280         /* FIXME: finish the array */
 281         return NULL;
 282 }
 283
 284 /**
 285  * Creates a Firm type for an imaginary type
 286  */
 287 static ir_type *create_imaginary_type(const atomic_type_t *type)
 288 {
 289         return create_atomic_type(type->akind, (const type_t*)type);
 290 }
 291
 292 /**
 293  * return type of a parameter (and take transparent union gnu extension into
 294  * account)
 295  */
 296 static type_t *get_parameter_type(type_t *orig_type)
 297 {
 298         type_t *type = skip_typeref(orig_type);
 299         if (is_type_union(type)
 300                         && get_type_modifiers(orig_type) & DM_TRANSPARENT_UNION) {
 301                 compound_t *compound = type->compound.compound;
 302                 type                 = compound->members.entities->declaration.type;
 303         }
 304
 305         return type;
 306 }
 307
 308 static ir_type *create_method_type(const function_type_t *function_type, bool for_closure)
 309 {
 310         type_t        *return_type  = skip_typeref(function_type->return_type);
 311
 312         int            n_parameters = count_parameters(function_type)
 313                                        + (for_closure ? 1 : 0);
 314         int            n_results    = is_type_void(return_type) ? 0 : 1;
 315         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) function_type);
 316         ir_type       *irtype       = new_d_type_method(n_parameters, n_results, dbgi);
 317
 318         if (!is_type_void(return_type)) {
 319                 ir_type *restype = get_ir_type(return_type);
 320                 set_method_res_type(irtype, 0, restype);
 321         }
 322
 323         function_parameter_t *parameter = function_type->parameters;
 324         int                   n         = 0;
 325         if (for_closure) {
 326                 ir_type *p_irtype = get_ir_type(type_void_ptr);
 327                 set_method_param_type(irtype, n, p_irtype);
 328                 ++n;
 329         }
 330         for ( ; parameter != NULL; parameter = parameter->next) {
 331                 type_t  *type     = get_parameter_type(parameter->type);
 332                 ir_type *p_irtype = get_ir_type(type);
 333                 set_method_param_type(irtype, n, p_irtype);
 334                 ++n;
 335         }
 336
 337         bool is_variadic = function_type->variadic;
 338
 339         if (is_variadic)
 340                 set_method_variadicity(irtype, variadicity_variadic);
 341
 342         unsigned cc = get_method_calling_convention(irtype);
 343         switch (function_type->calling_convention) {
 344         case CC_DEFAULT: /* unspecified calling convention, equal to one of the other, typically cdecl */
 345         case CC_CDECL:
 346 is_cdecl:
 347                 set_method_calling_convention(irtype, SET_CDECL(cc));
 348                 break;
 349
 350         case CC_STDCALL:
 351                 if (is_variadic)
 352                         goto is_cdecl;
 353
 354                 /* only non-variadic function can use stdcall, else use cdecl */
 355                 set_method_calling_convention(irtype, SET_STDCALL(cc));
 356                 break;
 357
 358         case CC_FASTCALL:
 359                 if (is_variadic)
 360                         goto is_cdecl;
 361                 /* only non-variadic function can use fastcall, else use cdecl */
 362                 set_method_calling_convention(irtype, SET_FASTCALL(cc));
 363                 break;
 364
 365         case CC_THISCALL:
 366                 /* Hmm, leave default, not accepted by the parser yet. */
 367                 break;
 368         }
 369
 370         if (for_closure)
 371                 set_method_calling_convention(irtype, get_method_calling_convention(irtype) | cc_this_call);
 372
 373         const decl_modifiers_t modifiers = function_type->modifiers;
 374         if (modifiers & DM_CONST)
 375                 add_method_additional_properties(irtype, mtp_property_const);
 376         if (modifiers & DM_PURE)
 377                 add_method_additional_properties(irtype, mtp_property_pure);
 378         if (modifiers & DM_RETURNS_TWICE)
 379                 add_method_additional_properties(irtype, mtp_property_returns_twice);
 380         if (modifiers & DM_NORETURN)
 381                 add_method_additional_properties(irtype, mtp_property_noreturn);
 382         if (modifiers & DM_NOTHROW)
 383                 add_method_additional_properties(irtype, mtp_property_nothrow);
 384         if (modifiers & DM_MALLOC)
 385                 add_method_additional_properties(irtype, mtp_property_malloc);
 386
 387         return irtype;
 388 }
 389
 390 static ir_type *create_pointer_type(pointer_type_t *type)
 391 {
 392         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) type);
 393         type_t        *points_to    = type->points_to;
 394         ir_type       *ir_points_to = get_ir_type_incomplete(points_to);
 395         ir_type       *irtype       = new_d_type_pointer(ir_points_to, dbgi);
 396
 397         return irtype;
 398 }
 399
 400 static ir_type *create_reference_type(reference_type_t *type)
 401 {
 402         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) type);
 403         type_t        *refers_to    = type->refers_to;
 404         ir_type       *ir_refers_to = get_ir_type_incomplete(refers_to);
 405         ir_type       *irtype       = new_d_type_pointer(ir_refers_to, dbgi);
 406
 407         return irtype;
 408 }
 409
 410 static ir_type *create_array_type(array_type_t *type)
 411 {
 412         type_dbg_info *dbgi            = get_type_dbg_info_((const type_t*) type);
 413         type_t        *element_type    = type->element_type;
 414         ir_type       *ir_element_type = get_ir_type(element_type);
 415         ir_type       *irtype          = new_d_type_array(1, ir_element_type, dbgi);
 416
 417         const int align = get_type_alignment_bytes(ir_element_type);
 418         set_type_alignment_bytes(irtype, align);
 419
 420         if (type->size_constant) {
 421                 int n_elements = type->size;
 422
 423                 set_array_bounds_int(irtype, 0, 0, n_elements);
 424
 425                 size_t elemsize = get_type_size_bytes(ir_element_type);
 426                 if (elemsize % align > 0) {
 427                         elemsize += align - (elemsize % align);
 428                 }
 429                 set_type_size_bytes(irtype, n_elements * elemsize);
 430         } else {
 431                 set_array_lower_bound_int(irtype, 0, 0);
 432         }
 433         set_type_state(irtype, layout_fixed);
 434
 435         return irtype;
 436 }
 437
 438 /**
 439  * Return the signed integer type of size bits.
 440  *
 441  * @param size   the size
 442  */
 443 static ir_type *get_signed_int_type_for_bit_size(ir_type *base_tp,
 444                                                  unsigned size,
 445                                                                                                  const type_t *type)
 446 {
 447         static ir_mode *s_modes[64 + 1] = {NULL, };
 448         ir_type *res;
 449         ir_mode *mode;
 450
 451         if (size <= 0 || size > 64)
 452                 return NULL;
 453
 454         mode = s_modes[size];
 455         if (mode == NULL) {
 456                 char name[32];
 457
 458                 snprintf(name, sizeof(name), "bf_I%u", size);
 459                 mode = new_int_mode(name, irma_twos_complement, size, 1, 0);
 460                 s_modes[size] = mode;
 461         }
 462
 463         type_dbg_info *dbgi = get_type_dbg_info_(type);
 464         res                 = new_d_type_primitive(mode, dbgi);
 465         set_primitive_base_type(res, base_tp);
 466
 467         return res;
 468 }
 469
 470 /**
 471  * Return the unsigned integer type of size bits.
 472  *
 473  * @param size   the size
 474  */
 475 static ir_type *get_unsigned_int_type_for_bit_size(ir_type *base_tp,
 476                                                    unsigned size,
 477                                                                                                    const type_t *type)
 478 {
 479         static ir_mode *u_modes[64 + 1] = {NULL, };
 480         ir_type *res;
 481         ir_mode *mode;
 482
 483         if (size <= 0 || size > 64)
 484                 return NULL;
 485
 486         mode = u_modes[size];
 487         if (mode == NULL) {
 488                 char name[32];
 489
 490                 snprintf(name, sizeof(name), "bf_U%u", size);
 491                 mode = new_int_mode(name, irma_twos_complement, size, 0, 0);
 492                 u_modes[size] = mode;
 493         }
 494
 495         type_dbg_info *dbgi = get_type_dbg_info_(type);
 496         res = new_d_type_primitive(mode, dbgi);
 497         set_primitive_base_type(res, base_tp);
 498
 499         return res;
 500 }
 501
 502 static ir_type *create_bitfield_type(const entity_t *entity)
 503 {
 504         assert(entity->kind == ENTITY_COMPOUND_MEMBER);
 505         type_t *base = skip_typeref(entity->declaration.type);
 506         assert(is_type_integer(base));
 507         ir_type *irbase = get_ir_type(base);
 508
 509         unsigned bit_size = entity->compound_member.bit_size;
 510
 511         if (is_type_signed(base)) {
 512                 return get_signed_int_type_for_bit_size(irbase, bit_size, base);
 513         } else {
 514                 return get_unsigned_int_type_for_bit_size(irbase, bit_size, base);
 515         }
 516 }
 517
 518 /**
 519  * Construct firm type from ast struct type.
 520  */
 521 static ir_type *create_compound_type(compound_type_t *const type, bool const incomplete)
 522 {
 523         compound_t *compound = type->compound;
 524
 525         if (compound->irtype != NULL && (compound->irtype_complete || incomplete)) {
 526                 return compound->irtype;
 527         }
 528
 529         bool const is_union = type->base.kind == TYPE_COMPOUND_UNION;
 530
 531         symbol_t *type_symbol = compound->base.symbol;
 532         ident    *id;
 533         if (type_symbol != NULL) {
 534                 id = new_id_from_str(type_symbol->string);
 535         } else {
 536                 if (is_union) {
 537                         id = id_unique("__anonymous_union.%u");
 538                 } else {
 539                         id = id_unique("__anonymous_struct.%u");
 540                 }
 541         }
 542
 543         ir_type *irtype;
 544         if (is_union) {
 545                 irtype = new_type_union(id);
 546         } else {
 547                 irtype = new_type_struct(id);
 548         }
 549
 550         compound->irtype_complete = false;
 551         compound->irtype          = irtype;
 552
 553         if (incomplete)
 554                 return irtype;
 555
 556         if (is_union) {
 557                 layout_union_type(type);
 558         } else {
 559                 layout_struct_type(type);
 560         }
 561
 562         compound->irtype_complete = true;
 563
 564         entity_t *entry = compound->members.entities;
 565         for ( ; entry != NULL; entry = entry->base.next) {
 566                 if (entry->kind != ENTITY_COMPOUND_MEMBER)
 567                         continue;
 568
 569                 symbol_t *symbol     = entry->base.symbol;
 570                 type_t   *entry_type = entry->declaration.type;
 571                 ident    *ident;
 572                 if (symbol == NULL) {
 573                         /* anonymous bitfield member, skip */
 574                         if (entry->compound_member.bitfield)
 575                                 continue;
 576                         assert(is_type_compound(entry_type));
 577                         ident = id_unique("anon.%u");
 578                 } else {
 579                         ident = new_id_from_str(symbol->string);
 580                 }
 581
 582                 dbg_info *dbgi       = get_dbg_info(&entry->base.source_position);
 583
 584                 ir_type *entry_irtype;
 585                 if (entry->compound_member.bitfield) {
 586                         entry_irtype = create_bitfield_type(entry);
 587                 } else {
 588                         entry_irtype = get_ir_type(entry_type);
 589                 }
 590                 ir_entity *entity = new_d_entity(irtype, ident, entry_irtype, dbgi);
 591
 592                 set_entity_offset(entity, entry->compound_member.offset);
 593                 set_entity_offset_bits_remainder(entity,
 594                                                  entry->compound_member.bit_offset);
 595
 596                 assert(entry->declaration.kind == DECLARATION_KIND_UNKNOWN);
 597                 entry->declaration.kind       = DECLARATION_KIND_COMPOUND_MEMBER;
 598                 entry->compound_member.entity = entity;
 599         }
 600
 601         set_type_alignment_bytes(irtype, compound->alignment);
 602         set_type_size_bytes(irtype, compound->size);
 603         set_type_state(irtype, layout_fixed);
 604
 605         return irtype;
 606 }
 607
 608 static ir_tarval *fold_constant_to_tarval(expression_t const *);
 609
 610 static void determine_enum_values(enum_type_t *const type)
 611 {
 612         ir_mode   *const mode    = atomic_modes[type->base.akind];
 613         ir_tarval *const one     = get_mode_one(mode);
 614         ir_tarval *      tv_next = get_mode_null(mode);
 615
 616         enum_t   *enume = type->enume;
 617         entity_t *entry = enume->base.next;
 618         for (; entry != NULL; entry = entry->base.next) {
 619                 if (entry->kind != ENTITY_ENUM_VALUE)
 620                         break;
 621
 622                 expression_t *const init = entry->enum_value.value;
 623                 if (init != NULL) {
 624                         tv_next = fold_constant_to_tarval(init);
 625                 }
 626                 assert(entry->enum_value.tv == NULL || entry->enum_value.tv == tv_next);
 627                 entry->enum_value.tv = tv_next;
 628                 tv_next = tarval_add(tv_next, one);
 629         }
 630 }
 631
 632 static ir_type *create_enum_type(enum_type_t *const type)
 633 {
 634         return create_atomic_type(type->base.akind, (const type_t*) type);
 635 }
 636
 637 static ir_type *get_ir_type_incomplete(type_t *type)
 638 {
 639         type = skip_typeref(type);
 640
 641         if (type->base.firm_type != NULL) {
 642                 return type->base.firm_type;
 643         }
 644
 645         if (is_type_compound(type)) {
 646                 return create_compound_type(&type->compound, true);
 647         } else {
 648                 return get_ir_type(type);
 649         }
 650 }
 651
 652 ir_type *get_ir_type(type_t *type)
 653 {
 654         type = skip_typeref(type);
 655
 656         if (type->base.firm_type != NULL) {
 657                 return type->base.firm_type;
 658         }
 659
 660         ir_type *firm_type = NULL;
 661         switch (type->kind) {
 662         case TYPE_ATOMIC:
 663                 firm_type = create_atomic_type(type->atomic.akind, type);
 664                 break;
 665         case TYPE_COMPLEX:
 666                 firm_type = create_complex_type(&type->atomic);
 667                 break;
 668         case TYPE_IMAGINARY:
 669                 firm_type = create_imaginary_type(&type->atomic);
 670                 break;
 671         case TYPE_FUNCTION:
 672                 firm_type = create_method_type(&type->function, false);
 673                 break;
 674         case TYPE_POINTER:
 675                 firm_type = create_pointer_type(&type->pointer);
 676                 break;
 677         case TYPE_REFERENCE:
 678                 firm_type = create_reference_type(&type->reference);
 679                 break;
 680         case TYPE_ARRAY:
 681                 firm_type = create_array_type(&type->array);
 682                 break;
 683         case TYPE_COMPOUND_STRUCT:
 684         case TYPE_COMPOUND_UNION:
 685                 firm_type = create_compound_type(&type->compound, false);
 686                 break;
 687         case TYPE_ENUM:
 688                 firm_type = create_enum_type(&type->enumt);
 689                 break;
 690
 691         case TYPE_ERROR:
 692         case TYPE_TYPEOF:
 693         case TYPE_TYPEDEF:
 694                 break;
 695         }
 696         if (firm_type == NULL)
 697                 panic("unknown type found");
 698
 699         type->base.firm_type = firm_type;
 700         return firm_type;
 701 }
 702
 703 static ir_mode *get_ir_mode_storage(type_t *type)
 704 {
 705         type = skip_typeref(type);
 706
 707         /* Firm doesn't report a mode for arrays and structs/unions. */
 708         if (!is_type_scalar(type)) {
 709                 return mode_P_data;
 710         }
 711
 712         ir_type *const irtype = get_ir_type(type);
 713         ir_mode *const mode   = get_type_mode(irtype);
 714         assert(mode != NULL);
 715         return mode;
 716 }
 717
 718 /*
 719  * get arithmetic mode for a type. This is different from get_ir_mode_storage,
 720  * int that it returns bigger modes for floating point on some platforms
 721  * (x87 internally does arithemtic with 80bits)
 722  */
 723 static ir_mode *get_ir_mode_arithmetic(type_t *type)
 724 {
 725         ir_mode *mode = get_ir_mode_storage(type);
 726         if (mode_is_float(mode) && mode_float_arithmetic != NULL) {
 727                 return mode_float_arithmetic;
 728         }
 729
 730         return mode;
 731 }
 732
 733 /**
 734  * Return a node representing the size of a type.
 735  */
 736 static ir_node *get_type_size_node(type_t *type)
 737 {
 738         unsigned size;
 739         ir_mode *mode = get_ir_mode_arithmetic(type_size_t);
 740         type = skip_typeref(type);
 741
 742         if (is_type_array(type) && type->array.is_vla) {
 743                 ir_node *size_node = get_vla_size(&type->array);
 744                 ir_node *elem_size = get_type_size_node(type->array.element_type);
 745                 ir_node *real_size = new_d_Mul(NULL, size_node, elem_size, mode);
 746                 return real_size;
 747         }
 748
 749         size = get_type_size(type);
 750         return new_Const_long(mode, size);
 751 }
 752
 753 /** Names of the runtime functions. */
 754 static const struct {
 755         int        id;           /**< the rts id */
 756         int        n_res;        /**< number of return values */
 757         const char *name;        /**< the name of the rts function */
 758         int        n_params;     /**< number of parameters */
 759         unsigned   flags;        /**< language flags */
 760 } rts_data[] = {
 761         { rts_debugbreak, 0, "__debugbreak", 0, _MS },
 762         { rts_abort,      0, "abort",        0, _C89 },
 763         { rts_alloca,     1, "alloca",       1, _ALL },
 764         { rts_abs,        1, "abs",          1, _C89 },
 765         { rts_labs,       1, "labs",         1, _C89 },
 766         { rts_llabs,      1, "llabs",        1, _C99 },
 767         { rts_imaxabs,    1, "imaxabs",      1, _C99 },
 768
 769         { rts_fabs,       1, "fabs",         1, _C89 },
 770         { rts_sqrt,       1, "sqrt",         1, _C89 },
 771         { rts_cbrt,       1, "cbrt",         1, _C99 },
 772         { rts_exp,        1, "exp",          1, _C89 },
 773         { rts_exp2,       1, "exp2",         1, _C89 },
 774         { rts_exp10,      1, "exp10",        1, _GNUC },
 775         { rts_log,        1, "log",          1, _C89 },
 776         { rts_log2,       1, "log2",         1, _C89 },
 777         { rts_log10,      1, "log10",        1, _C89 },
 778         { rts_pow,        1, "pow",          2, _C89 },
 779         { rts_sin,        1, "sin",          1, _C89 },
 780         { rts_cos,        1, "cos",          1, _C89 },
 781         { rts_tan,        1, "tan",          1, _C89 },
 782         { rts_asin,       1, "asin",         1, _C89 },
 783         { rts_acos,       1, "acos",         1, _C89 },
 784         { rts_atan,       1, "atan",         1, _C89 },
 785         { rts_sinh,       1, "sinh",         1, _C89 },
 786         { rts_cosh,       1, "cosh",         1, _C89 },
 787         { rts_tanh,       1, "tanh",         1, _C89 },
 788
 789         { rts_fabsf,      1, "fabsf",        1, _C99 },
 790         { rts_sqrtf,      1, "sqrtf",        1, _C99 },
 791         { rts_cbrtf,      1, "cbrtf",        1, _C99 },
 792         { rts_expf,       1, "expf",         1, _C99 },
 793         { rts_exp2f,      1, "exp2f",        1, _C99 },
 794         { rts_exp10f,     1, "exp10f",       1, _GNUC },
 795         { rts_logf,       1, "logf",         1, _C99 },
 796         { rts_log2f,      1, "log2f",        1, _C99 },
 797         { rts_log10f,     1, "log10f",       1, _C99 },
 798         { rts_powf,       1, "powf",         2, _C99 },
 799         { rts_sinf,       1, "sinf",         1, _C99 },
 800         { rts_cosf,       1, "cosf",         1, _C99 },
 801         { rts_tanf,       1, "tanf",         1, _C99 },
 802         { rts_asinf,      1, "asinf",        1, _C99 },
 803         { rts_acosf,      1, "acosf",        1, _C99 },
 804         { rts_atanf,      1, "atanf",        1, _C99 },
 805         { rts_sinhf,      1, "sinhf",        1, _C99 },
 806         { rts_coshf,      1, "coshf",        1, _C99 },
 807         { rts_tanhf,      1, "tanhf",        1, _C99 },
 808
 809         { rts_fabsl,      1, "fabsl",        1, _C99 },
 810         { rts_sqrtl,      1, "sqrtl",        1, _C99 },
 811         { rts_cbrtl,      1, "cbrtl",        1, _C99 },
 812         { rts_expl,       1, "expl",         1, _C99 },
 813         { rts_exp2l,      1, "exp2l",        1, _C99 },
 814         { rts_exp10l,     1, "exp10l",       1, _GNUC },
 815         { rts_logl,       1, "logl",         1, _C99 },
 816         { rts_log2l,      1, "log2l",        1, _C99 },
 817         { rts_log10l,     1, "log10l",       1, _C99 },
 818         { rts_powl,       1, "powl",         2, _C99 },
 819         { rts_sinl,       1, "sinl",         1, _C99 },
 820         { rts_cosl,       1, "cosl",         1, _C99 },
 821         { rts_tanl,       1, "tanl",         1, _C99 },
 822         { rts_asinl,      1, "asinl",        1, _C99 },
 823         { rts_acosl,      1, "acosl",        1, _C99 },
 824         { rts_atanl,      1, "atanl",        1, _C99 },
 825         { rts_sinhl,      1, "sinhl",        1, _C99 },
 826         { rts_coshl,      1, "coshl",        1, _C99 },
 827         { rts_tanhl,      1, "tanhl",        1, _C99 },
 828
 829         { rts_strcmp,     1, "strcmp",       2, _C89 },
 830         { rts_strncmp,    1, "strncmp",      3, _C89 },
 831         { rts_strcpy,     1, "strcpy",       2, _C89 },
 832         { rts_strlen,     1, "strlen",       1, _C89 },
 833         { rts_memcpy,     1, "memcpy",       3, _C89 },
 834         { rts_mempcpy,    1, "mempcpy",      3, _GNUC },
 835         { rts_memmove,    1, "memmove",      3, _C89 },
 836         { rts_memset,     1, "memset",       3, _C89 },
 837         { rts_memcmp,     1, "memcmp",       3, _C89 },
 838 };
 839
 840 static ident *rts_idents[lengthof(rts_data)];
 841
 842 static create_ld_ident_func create_ld_ident = create_name_linux_elf;
 843
 844 void set_create_ld_ident(ident *(*func)(entity_t*))
 845 {
 846         create_ld_ident = func;
 847 }
 848
 849 static bool declaration_is_definition(const entity_t *entity)
 850 {
 851         switch (entity->kind) {
 852         case ENTITY_VARIABLE:
 853                 return entity->declaration.storage_class != STORAGE_CLASS_EXTERN;
 854         case ENTITY_FUNCTION:
 855                 return entity->function.statement != NULL;
 856         case ENTITY_PARAMETER:
 857         case ENTITY_COMPOUND_MEMBER:
 858                 return false;
 859         case ENTITY_TYPEDEF:
 860         case ENTITY_ENUM:
 861         case ENTITY_ENUM_VALUE:
 862         case ENTITY_NAMESPACE:
 863         case ENTITY_LABEL:
 864         case ENTITY_LOCAL_LABEL:
 865                 break;
 866         }
 867         panic("declaration_is_definition called on non-declaration");
 868 }
 869
 870 /**
 871  * Handle GNU attributes for entities
 872  *
 873  * @param ent   the entity
 874  * @param decl  the routine declaration
 875  */
 876 static void handle_decl_modifiers(ir_entity *irentity, entity_t *entity)
 877 {
 878         assert(is_declaration(entity));
 879         decl_modifiers_t modifiers = entity->declaration.modifiers;
 880
 881         if (is_method_entity(irentity)) {
 882                 if (modifiers & DM_PURE) {
 883                         set_entity_additional_properties(irentity, mtp_property_pure);
 884                 }
 885                 if (modifiers & DM_CONST) {
 886                         add_entity_additional_properties(irentity, mtp_property_const);
 887                 }
 888         }
 889         if ((modifiers & DM_USED) && declaration_is_definition(entity)) {
 890                 add_entity_linkage(irentity, IR_LINKAGE_HIDDEN_USER);
 891         }
 892         if ((modifiers & DM_WEAK) && declaration_is_definition(entity)
 893             && entity->declaration.storage_class != STORAGE_CLASS_EXTERN) {
 894                 add_entity_linkage(irentity, IR_LINKAGE_WEAK);
 895         }
 896 }
 897
 898 static bool is_main(entity_t *entity)
 899 {
 900         static symbol_t *sym_main = NULL;
 901         if (sym_main == NULL) {
 902                 sym_main = symbol_table_insert("main");
 903         }
 904
 905         if (entity->base.symbol != sym_main)
 906                 return false;
 907         /* must be in outermost scope */
 908         if (entity->base.parent_scope != &current_translation_unit->scope)
 909                 return false;
 910
 911         return true;
 912 }
 913
 914 /**
 915  * Creates an entity representing a function.
 916  *
 917  * @param entity       the function declaration/definition
 918  * @param owner_type   the owner type of this function, NULL
 919  *                     for global functions
 920  */
 921 static ir_entity *get_function_entity(entity_t *entity, ir_type *owner_type)
 922 {
 923         assert(entity->kind == ENTITY_FUNCTION);
 924         if (entity->function.irentity != NULL)
 925                 return entity->function.irentity;
 926
 927         switch (entity->function.btk) {
 928         case BUILTIN_NONE:
 929         case BUILTIN_LIBC:
 930         case BUILTIN_LIBC_CHECK:
 931                 break;
 932         default:
 933                 return NULL;
 934         }
 935
 936         symbol_t *symbol = entity->base.symbol;
 937         ident    *id     = new_id_from_str(symbol->string);
 938
 939         /* already an entity defined? */
 940         ir_entity *irentity = entitymap_get(&entitymap, symbol);
 941         bool const has_body = entity->function.statement != NULL;
 942         if (irentity != NULL) {
 943                 goto entity_created;
 944         }
 945
 946         ir_type *ir_type_method;
 947         if (entity->function.need_closure)
 948                 ir_type_method = create_method_type(&entity->declaration.type->function, true);
 949         else
 950                 ir_type_method = get_ir_type(entity->declaration.type);
 951
 952         bool nested_function = false;
 953         if (owner_type == NULL)
 954                 owner_type = get_glob_type();
 955         else
 956                 nested_function = true;
 957
 958         dbg_info *const dbgi = get_dbg_info(&entity->base.source_position);
 959         irentity = new_d_entity(owner_type, id, ir_type_method, dbgi);
 960
 961         ident *ld_id;
 962         if (nested_function)
 963                 ld_id = id_unique("inner.%u");
 964         else
 965                 ld_id = create_ld_ident(entity);
 966         set_entity_ld_ident(irentity, ld_id);
 967
 968         handle_decl_modifiers(irentity, entity);
 969
 970         if (! nested_function) {
 971                 storage_class_tag_t const storage_class
 972                         = (storage_class_tag_t) entity->declaration.storage_class;
 973                 if (storage_class == STORAGE_CLASS_STATIC) {
 974                     set_entity_visibility(irentity, ir_visibility_local);
 975                 } else {
 976                     set_entity_visibility(irentity, ir_visibility_external);
 977                 }
 978
 979                 bool const is_inline = entity->function.is_inline;
 980                 if (is_inline && has_body) {
 981                         if (((c_mode & _C99) && storage_class == STORAGE_CLASS_NONE)
 982                             || ((c_mode & _C99) == 0
 983                                 && storage_class == STORAGE_CLASS_EXTERN)) {
 984                                 add_entity_linkage(irentity, IR_LINKAGE_NO_CODEGEN);
 985                         }
 986                 }
 987         } else {
 988                 /* nested functions are always local */
 989                 set_entity_visibility(irentity, ir_visibility_local);
 990         }
 991
 992         /* We should check for file scope here, but as long as we compile C only
 993            this is not needed. */
 994         if (!freestanding && !has_body) {
 995                 /* check for a known runtime function */
 996                 for (size_t i = 0; i < lengthof(rts_data); ++i) {
 997                         if (id != rts_idents[i])
 998                                 continue;
 999
1000                         function_type_t *function_type
1001                                 = &entity->declaration.type->function;
1002                         /* rts_entities code can't handle a "wrong" number of parameters */
1003                         if (function_type->unspecified_parameters)
1004                                 continue;
1005
1006                         /* check number of parameters */
1007                         int n_params = count_parameters(function_type);
1008                         if (n_params != rts_data[i].n_params)
1009                                 continue;
1010
1011                         type_t *return_type = skip_typeref(function_type->return_type);
1012                         int     n_res       = is_type_void(return_type) ? 0 : 1;
1013                         if (n_res != rts_data[i].n_res)
1014                                 continue;
1015
1016                         /* ignore those rts functions not necessary needed for current mode */
1017                         if ((c_mode & rts_data[i].flags) == 0)
1018                                 continue;
1019                         assert(rts_entities[rts_data[i].id] == NULL);
1020                         rts_entities[rts_data[i].id] = irentity;
1021                 }
1022         }
1023
1024         entitymap_insert(&entitymap, symbol, irentity);
1025
1026 entity_created:
1027         entity->declaration.kind  = DECLARATION_KIND_FUNCTION;
1028         entity->function.irentity = irentity;
1029
1030         return irentity;
1031 }
1032
1033 /**
1034  * Creates a SymConst for a given entity.
1035  *
1036  * @param dbgi    debug info
1037  * @param entity  the entity
1038  */
1039 static ir_node *create_symconst(dbg_info *dbgi, ir_entity *entity)
1040 {
1041         assert(entity != NULL);
1042         union symconst_symbol sym;
1043         sym.entity_p = entity;
1044         return new_d_SymConst(dbgi, mode_P, sym, symconst_addr_ent);
1045 }
1046
1047 static ir_node *create_Const_from_bool(ir_mode *const mode, bool const v)
1048 {
1049         return new_Const((v ? get_mode_one : get_mode_null)(mode));
1050 }
1051
1052 static ir_node *create_conv_from_b(dbg_info *dbgi, ir_node *value,
1053                                    ir_mode *dest_mode)
1054 {
1055         if (is_Const(value)) {
1056                 return create_Const_from_bool(dest_mode, !is_Const_null(value));
1057         }
1058
1059         ir_node *cond       = new_d_Cond(dbgi, value);
1060         ir_node *proj_true  = new_Proj(cond, mode_X, pn_Cond_true);
1061         ir_node *proj_false = new_Proj(cond, mode_X, pn_Cond_false);
1062         ir_node *tblock     = new_Block(1, &proj_true);
1063         ir_node *fblock     = new_Block(1, &proj_false);
1064         set_cur_block(tblock);
1065         ir_node *const1 = new_Const(get_mode_one(dest_mode));
1066         ir_node *tjump  = new_Jmp();
1067         set_cur_block(fblock);
1068         ir_node *const0 = new_Const(get_mode_null(dest_mode));
1069         ir_node *fjump  = new_Jmp();
1070
1071         ir_node *in[2]      = { tjump, fjump };
1072         ir_node *mergeblock = new_Block(2, in);
1073         set_cur_block(mergeblock);
1074         ir_node *phi_in[2]  = { const1, const0 };
1075         ir_node *phi        = new_Phi(2, phi_in, dest_mode);
1076         return phi;
1077 }
1078
1079 static ir_node *create_conv(dbg_info *dbgi, ir_node *value, ir_mode *dest_mode)
1080 {
1081         ir_mode *value_mode = get_irn_mode(value);
1082
1083         if (value_mode == dest_mode)
1084                 return value;
1085
1086         if (dest_mode == mode_b) {
1087                 ir_node *zero = new_Const(get_mode_null(value_mode));
1088                 ir_node *cmp  = new_d_Cmp(dbgi, value, zero, ir_relation_unordered_less_greater);
1089                 return cmp;
1090         } else if (value_mode == mode_b) {
1091                 return create_conv_from_b(dbgi, value, dest_mode);
1092         }
1093
1094         return new_d_Conv(dbgi, value, dest_mode);
1095 }
1096
1097 /**
1098  * Creates a SymConst node representing a string constant.
1099  *
1100  * @param src_pos    the source position of the string constant
1101  * @param id_prefix  a prefix for the name of the generated string constant
1102  * @param value      the value of the string constant
1103  */
1104 static ir_node *string_to_firm(source_position_t const *const src_pos, char const *const id_prefix, string_t const *const value)
1105 {
1106         size_t            const slen        = get_string_len(value) + 1;
1107         ir_initializer_t *const initializer = create_initializer_compound(slen);
1108         ir_type          *      elem_type;
1109         switch (value->encoding) {
1110         case STRING_ENCODING_CHAR: {
1111                 elem_type = ir_type_char;
1112
1113                 ir_mode *const mode = get_type_mode(elem_type);
1114                 char const    *p    = value->begin;
1115                 for (size_t i = 0; i < slen; ++i) {
1116                         ir_tarval        *tv  = new_tarval_from_long(*p++, mode);
1117                         ir_initializer_t *val = create_initializer_tarval(tv);
1118                         set_initializer_compound_value(initializer, i, val);
1119                 }
1120                 goto finish;
1121         }
1122
1123         case STRING_ENCODING_WIDE: {
1124                 elem_type = ir_type_wchar_t;
1125
1126                 ir_mode *const mode = get_type_mode(elem_type);
1127                 char const    *p    = value->begin;
1128                 for (size_t i = 0; i < slen; ++i) {
1129                         assert(p <= value->begin + value->size);
1130                         utf32             v   = read_utf8_char(&p);
1131                         ir_tarval        *tv  = new_tarval_from_long(v, mode);
1132                         ir_initializer_t *val = create_initializer_tarval(tv);
1133                         set_initializer_compound_value(initializer, i, val);
1134                 }
1135                 goto finish;
1136         }
1137         }
1138         panic("invalid string encoding");
1139
1140 finish:;
1141         ir_type *const type = new_type_array(1, elem_type);
1142         set_array_bounds_int(type, 0, 0, slen);
1143         set_type_size_bytes( type, slen * get_type_size_bytes(elem_type));
1144         set_type_state(      type, layout_fixed);
1145
1146         ir_type   *const global_type = get_glob_type();
1147         ident     *const id          = id_unique(id_prefix);
1148         dbg_info  *const dbgi        = get_dbg_info(src_pos);
1149         ir_entity *const entity      = new_d_entity(global_type, id, type, dbgi);
1150         set_entity_ld_ident(   entity, id);
1151         set_entity_visibility( entity, ir_visibility_private);
1152         add_entity_linkage(    entity, IR_LINKAGE_CONSTANT);
1153         set_entity_initializer(entity, initializer);
1154
1155         return create_symconst(dbgi, entity);
1156 }
1157
1158 static bool try_create_integer(literal_expression_t *literal, type_t *type)
1159 {
1160         const char *string = literal->value.begin;
1161         size_t      size   = literal->value.size;
1162
1163         assert(type->kind == TYPE_ATOMIC);
1164         atomic_type_kind_t akind = type->atomic.akind;
1165
1166         ir_mode   *const mode = atomic_modes[akind];
1167         ir_tarval *const tv   = new_tarval_from_str(string, size, mode);
1168         if (tv == tarval_bad)
1169                 return false;
1170
1171         literal->base.type    = type;
1172         literal->target_value = tv;
1173         return true;
1174 }
1175
1176 static void create_integer_tarval(literal_expression_t *literal)
1177 {
1178         /* -1: signed only, 0: any, 1: unsigned only */
1179         int             sign   = literal->value.begin[0] != '0' /* decimal */ ? -1 : 0;
1180         unsigned        ls     = 0;
1181         const string_t *suffix = &literal->suffix;
1182         /* parse suffix */
1183         if (suffix->size > 0) {
1184                 for (const char *c = suffix->begin; *c != '\0'; ++c) {
1185                         if (*c == 'u' || *c == 'U') sign = 1;
1186                         if (*c == 'l' || *c == 'L') { ++ls; }
1187                 }
1188         }
1189
1190         tarval_int_overflow_mode_t old_mode = tarval_get_integer_overflow_mode();
1191
1192         /* now try if the constant is small enough for some types */
1193         tarval_set_integer_overflow_mode(TV_OVERFLOW_BAD);
1194         if (ls < 1) {
1195                 if (sign <= 0 && try_create_integer(literal, type_int))
1196                         goto finished;
1197                 if (sign >= 0 && try_create_integer(literal, type_unsigned_int))
1198                         goto finished;
1199         }
1200         if (ls < 2) {
1201                 if (sign <= 0 && try_create_integer(literal, type_long))
1202                         goto finished;
1203                 if (sign >= 0 && try_create_integer(literal, type_unsigned_long))
1204                         goto finished;
1205         }
1206         /* last try? then we should not report tarval_bad */
1207         if (sign < 0)
1208                 tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
1209         if (sign <= 0 && try_create_integer(literal, type_long_long))
1210                 goto finished;
1211
1212         /* last try */
1213         assert(sign >= 0);
1214         tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
1215         bool res = try_create_integer(literal, type_unsigned_long_long);
1216         if (!res)
1217                 panic("internal error when parsing number literal");
1218
1219 finished:
1220         tarval_set_integer_overflow_mode(old_mode);
1221 }
1222
1223 void determine_literal_type(literal_expression_t *literal)
1224 {
1225         switch (literal->base.kind) {
1226         case EXPR_LITERAL_INTEGER:
1227                 create_integer_tarval(literal);
1228                 return;
1229         default:
1230                 break;
1231         }
1232 }
1233
1234 /**
1235  * Creates a Const node representing a constant.
1236  */
1237 static ir_node *literal_to_firm(const literal_expression_t *literal)
1238 {
1239         type_t     *type   = skip_typeref(literal->base.type);
1240         ir_mode    *mode   = get_ir_mode_storage(type);
1241         const char *string = literal->value.begin;
1242         size_t      size   = literal->value.size;
1243         ir_tarval  *tv;
1244
1245         switch (literal->base.kind) {
1246         case EXPR_LITERAL_INTEGER:
1247                 assert(literal->target_value != NULL);
1248                 tv = literal->target_value;
1249                 break;
1250
1251         case EXPR_LITERAL_FLOATINGPOINT:
1252                 tv = new_tarval_from_str(string, size, mode);
1253                 break;
1254
1255         case EXPR_LITERAL_BOOLEAN:
1256                 if (string[0] == 't') {
1257                         tv = get_mode_one(mode);
1258                 } else {
1259                         assert(string[0] == 'f');
1260         case EXPR_LITERAL_MS_NOOP:
1261                         tv = get_mode_null(mode);
1262                 }
1263                 break;
1264
1265         default:
1266                 panic("Invalid literal kind found");
1267         }
1268
1269         dbg_info *dbgi       = get_dbg_info(&literal->base.source_position);
1270         ir_node  *res        = new_d_Const(dbgi, tv);
1271         ir_mode  *mode_arith = get_ir_mode_arithmetic(type);
1272         return create_conv(dbgi, res, mode_arith);
1273 }
1274
1275 /**
1276  * Creates a Const node representing a character constant.
1277  */
1278 static ir_node *char_literal_to_firm(string_literal_expression_t const *literal)
1279 {
1280         type_t     *type   = skip_typeref(literal->base.type);
1281         ir_mode    *mode   = get_ir_mode_storage(type);
1282         const char *string = literal->value.begin;
1283         size_t      size   = literal->value.size;
1284         ir_tarval  *tv;
1285
1286         switch (literal->value.encoding) {
1287         case STRING_ENCODING_WIDE: {
1288                 utf32  v = read_utf8_char(&string);
1289                 char   buf[128];
1290                 size_t len = snprintf(buf, sizeof(buf), UTF32_PRINTF_FORMAT, v);
1291
1292                 tv = new_tarval_from_str(buf, len, mode);
1293                 break;
1294         }
1295
1296         case STRING_ENCODING_CHAR: {
1297                 long long int v;
1298                 bool char_is_signed
1299                         = get_atomic_type_flags(ATOMIC_TYPE_CHAR) & ATOMIC_TYPE_FLAG_SIGNED;
1300                 if (size == 1 && char_is_signed) {
1301                         v = (signed char)string[0];
1302                 } else {
1303                         v = 0;
1304                         for (size_t i = 0; i < size; ++i) {
1305                                 v = (v << 8) | ((unsigned char)string[i]);
1306                         }
1307                 }
1308                 char   buf[128];
1309                 size_t len = snprintf(buf, sizeof(buf), "%lld", v);
1310
1311                 tv = new_tarval_from_str(buf, len, mode);
1312                 break;
1313         }
1314
1315         default:
1316                 panic("Invalid literal kind found");
1317         }
1318
1319         dbg_info *dbgi       = get_dbg_info(&literal->base.source_position);
1320         ir_node  *res        = new_d_Const(dbgi, tv);
1321         ir_mode  *mode_arith = get_ir_mode_arithmetic(type);
1322         return create_conv(dbgi, res, mode_arith);
1323 }
1324
1325 /*
1326  * Allocate an area of size bytes aligned at alignment
1327  * at a frame type.
1328  */
1329 static ir_entity *alloc_trampoline(ir_type *frame_type, int size, unsigned alignment)
1330 {
1331         static unsigned area_cnt = 0;
1332         char buf[32];
1333
1334         ir_type *tp = new_type_array(1, ir_type_char);
1335         set_array_bounds_int(tp, 0, 0, size);
1336         set_type_alignment_bytes(tp, alignment);
1337
1338         snprintf(buf, sizeof(buf), "trampolin%u", area_cnt++);
1339         ident *name = new_id_from_str(buf);
1340         ir_entity *area = new_entity(frame_type, name, tp);
1341
1342         /* mark this entity as compiler generated */
1343         set_entity_compiler_generated(area, 1);
1344         return area;
1345 }
1346
1347 /**
1348  * Return a node representing a trampoline region
1349  * for a given function entity.
1350  *
1351  * @param dbgi    debug info
1352  * @param entity  the function entity
1353  */
1354 static ir_node *get_trampoline_region(dbg_info *dbgi, ir_entity *entity)
1355 {
1356         ir_entity *region = NULL;
1357         int        i;
1358
1359         if (current_trampolines != NULL) {
1360                 for (i = ARR_LEN(current_trampolines) - 1; i >= 0; --i) {
1361                         if (current_trampolines[i].function == entity) {
1362                                 region = current_trampolines[i].region;
1363                                 break;
1364                         }
1365                 }
1366         } else {
1367                 current_trampolines = NEW_ARR_F(trampoline_region, 0);
1368         }
1369         ir_graph *irg = current_ir_graph;
1370         if (region == NULL) {
1371                 /* create a new region */
1372                 ir_type           *frame_tp = get_irg_frame_type(irg);
1373                 trampoline_region  reg;
1374                 reg.function = entity;
1375
1376                 reg.region   = alloc_trampoline(frame_tp,
1377                                                 be_params->trampoline_size,
1378                                                 be_params->trampoline_align);
1379                 ARR_APP1(trampoline_region, current_trampolines, reg);
1380                 region = reg.region;
1381         }
1382         return new_d_simpleSel(dbgi, get_irg_no_mem(irg), get_irg_frame(irg),
1383                                region);
1384 }
1385
1386 /**
1387  * Creates a trampoline for a function represented by an entity.
1388  *
1389  * @param dbgi    debug info
1390  * @param mode    the (reference) mode for the function address
1391  * @param entity  the function entity
1392  */
1393 static ir_node *create_trampoline(dbg_info *dbgi, ir_mode *mode,
1394                                   ir_entity *entity)
1395 {
1396         assert(entity != NULL);
1397         ir_node *in[3];
1398         in[0] = get_trampoline_region(dbgi, entity);
1399         in[1] = create_symconst(dbgi, entity);
1400         in[2] = get_irg_frame(current_ir_graph);
1401
1402         ir_node *irn = new_d_Builtin(dbgi, get_store(), 3, in, ir_bk_inner_trampoline, get_unknown_type());
1403         set_store(new_Proj(irn, mode_M, pn_Builtin_M));
1404         return new_Proj(irn, mode, pn_Builtin_max+1);
1405 }
1406
1407 /**
1408  * Dereference an address.
1409  *
1410  * @param dbgi  debug info
1411  * @param type  the type of the dereferenced result (the points_to type)
1412  * @param addr  the address to dereference
1413  */
1414 static ir_node *deref_address(dbg_info *const dbgi, type_t *const type,
1415                                       ir_node *const addr)
1416 {
1417         type_t *skipped = skip_typeref(type);
1418         if (is_type_incomplete(skipped))
1419                 return addr;
1420
1421         ir_type *irtype = get_ir_type(skipped);
1422         if (is_compound_type(irtype)
1423             || is_Method_type(irtype)
1424             || is_Array_type(irtype)) {
1425                 return addr;
1426         }
1427
1428         ir_cons_flags  flags    = skipped->base.qualifiers & TYPE_QUALIFIER_VOLATILE
1429                                   ? cons_volatile : cons_none;
1430         ir_mode *const mode     = get_type_mode(irtype);
1431         ir_node *const memory   = get_store();
1432         ir_node *const load     = new_d_Load(dbgi, memory, addr, mode, flags);
1433         ir_node *const load_mem = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1434         ir_node *const load_res = new_d_Proj(dbgi, load, mode,   pn_Load_res);
1435
1436         set_store(load_mem);
1437
1438         ir_mode *const mode_arithmetic = get_ir_mode_arithmetic(skipped);
1439         return create_conv(dbgi, load_res, mode_arithmetic);
1440 }
1441
1442 /**
1443  * Creates a strict Conv (to the node's mode) if necessary.
1444  *
1445  * @param dbgi  debug info
1446  * @param node  the node to strict conv
1447  */
1448 static ir_node *do_strict_conv(dbg_info *dbgi, ir_node *node)
1449 {
1450         ir_mode *mode = get_irn_mode(node);
1451
1452         if (!(get_irg_fp_model(current_ir_graph) & fp_explicit_rounding))
1453                 return node;
1454         if (!mode_is_float(mode))
1455                 return node;
1456
1457         /* check if there is already a Conv */
1458         if (is_Conv(node)) {
1459                 /* convert it into a strict Conv */
1460                 set_Conv_strict(node, 1);
1461                 return node;
1462         }
1463
1464         /* otherwise create a new one */
1465         return new_d_strictConv(dbgi, node, mode);
1466 }
1467
1468 /**
1469  * Returns the correct base address depending on whether it is a parameter or a
1470  * normal local variable.
1471  */
1472 static ir_node *get_local_frame(ir_entity *const ent)
1473 {
1474         ir_graph      *const irg   = current_ir_graph;
1475         const ir_type *const owner = get_entity_owner(ent);
1476         if (owner == current_outer_frame) {
1477                 assert(current_static_link != NULL);
1478                 return current_static_link;
1479         } else {
1480                 return get_irg_frame(irg);
1481         }
1482 }
1483
1484 /**
1485  * Keep all memory edges of the given block.
1486  */
1487 static void keep_all_memory(ir_node *block)
1488 {
1489         ir_node *old = get_cur_block();
1490
1491         set_cur_block(block);
1492         keep_alive(get_store());
1493         /* TODO: keep all memory edges from restricted pointers */
1494         set_cur_block(old);
1495 }
1496
1497 static ir_node *enum_constant_to_firm(reference_expression_t const *const ref)
1498 {
1499         entity_t *entity = ref->entity;
1500         if (entity->enum_value.tv == NULL) {
1501                 type_t *type = skip_typeref(entity->enum_value.enum_type);
1502                 assert(type->kind == TYPE_ENUM);
1503                 determine_enum_values(&type->enumt);
1504         }
1505
1506         return new_Const(entity->enum_value.tv);
1507 }
1508
1509 static ir_node *reference_addr(const reference_expression_t *ref)
1510 {
1511         dbg_info *dbgi   = get_dbg_info(&ref->base.source_position);
1512         entity_t *entity = ref->entity;
1513         assert(is_declaration(entity));
1514
1515         if (entity->kind == ENTITY_FUNCTION
1516             && entity->function.btk != BUILTIN_NONE) {
1517                 ir_entity *irentity = get_function_entity(entity, NULL);
1518                 /* for gcc compatibility we have to produce (dummy) addresses for some
1519                  * builtins which don't have entities */
1520                 if (irentity == NULL) {
1521                         source_position_t const *const pos = &ref->base.source_position;
1522                         warningf(WARN_OTHER, pos, "taking address of builtin '%N'", ref->entity);
1523
1524                         /* simply create a NULL pointer */
1525                         ir_mode  *mode = get_ir_mode_arithmetic(type_void_ptr);
1526                         ir_node  *res  = new_Const(get_mode_null(mode));
1527
1528                         return res;
1529                 }
1530         }
1531
1532         switch((declaration_kind_t) entity->declaration.kind) {
1533         case DECLARATION_KIND_UNKNOWN:
1534                 break;
1535         case DECLARATION_KIND_PARAMETER:
1536         case DECLARATION_KIND_LOCAL_VARIABLE:
1537                 /* you can store to a local variable (so we don't panic but return NULL
1538                  * as an indicator for no real address) */
1539                 return NULL;
1540         case DECLARATION_KIND_GLOBAL_VARIABLE: {
1541                 ir_node *const addr = create_symconst(dbgi, entity->variable.v.entity);
1542                 return addr;
1543         }
1544
1545         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY:
1546         case DECLARATION_KIND_PARAMETER_ENTITY: {
1547                 ir_entity *irentity = entity->variable.v.entity;
1548                 ir_node   *frame    = get_local_frame(irentity);
1549                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1550                 return sel;
1551         }
1552
1553         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
1554                 return entity->variable.v.vla_base;
1555
1556         case DECLARATION_KIND_FUNCTION: {
1557                 return create_symconst(dbgi, entity->function.irentity);
1558         }
1559
1560         case DECLARATION_KIND_INNER_FUNCTION: {
1561                 type_t  *const type = skip_typeref(entity->declaration.type);
1562                 ir_mode *const mode = get_ir_mode_storage(type);
1563                 if (!entity->function.goto_to_outer && !entity->function.need_closure) {
1564                         /* inner function not using the closure */
1565                         return create_symconst(dbgi, entity->function.irentity);
1566                 } else {
1567                         /* need trampoline here */
1568                         return create_trampoline(dbgi, mode, entity->function.irentity);
1569                 }
1570         }
1571
1572         case DECLARATION_KIND_COMPOUND_MEMBER:
1573                 panic("not implemented reference type");
1574         }
1575
1576         panic("reference to declaration with unknown type found");
1577 }
1578
1579 static ir_node *reference_expression_to_firm(const reference_expression_t *ref)
1580 {
1581         dbg_info *const dbgi   = get_dbg_info(&ref->base.source_position);
1582         entity_t *const entity = ref->entity;
1583         assert(is_declaration(entity));
1584
1585         switch ((declaration_kind_t)entity->declaration.kind) {
1586         case DECLARATION_KIND_LOCAL_VARIABLE:
1587         case DECLARATION_KIND_PARAMETER: {
1588                 type_t  *const type  = skip_typeref(entity->declaration.type);
1589                 ir_mode *const mode  = get_ir_mode_storage(type);
1590                 ir_node *const value = get_value(entity->variable.v.value_number, mode);
1591                 return create_conv(dbgi, value, get_ir_mode_arithmetic(type));
1592         }
1593
1594         default: {
1595                 ir_node *const addr = reference_addr(ref);
1596                 return deref_address(dbgi, entity->declaration.type, addr);
1597         }
1598         }
1599 }
1600
1601 /**
1602  * Transform calls to builtin functions.
1603  */
1604 static ir_node *process_builtin_call(const call_expression_t *call)
1605 {
1606         dbg_info *dbgi = get_dbg_info(&call->base.source_position);
1607
1608         assert(call->function->kind == EXPR_REFERENCE);
1609         reference_expression_t *builtin = &call->function->reference;
1610
1611         type_t *expr_type = skip_typeref(builtin->base.type);
1612         assert(is_type_pointer(expr_type));
1613
1614         type_t *function_type = skip_typeref(expr_type->pointer.points_to);
1615
1616         switch (builtin->entity->function.btk) {
1617         case BUILTIN_NONE:
1618                 break;
1619         case BUILTIN_ALLOCA: {
1620                 expression_t *argument = call->arguments->expression;
1621                 ir_node      *size     = expression_to_firm(argument);
1622
1623                 ir_node *store  = get_store();
1624                 ir_node *alloca = new_d_Alloc(dbgi, store, size, get_unknown_type(),
1625                                               stack_alloc);
1626                 ir_node *proj_m = new_Proj(alloca, mode_M, pn_Alloc_M);
1627                 set_store(proj_m);
1628                 ir_node *res    = new_Proj(alloca, mode_P_data, pn_Alloc_res);
1629
1630                 return res;
1631         }
1632         case BUILTIN_INF: {
1633                 type_t    *type = function_type->function.return_type;
1634                 ir_mode   *mode = get_ir_mode_arithmetic(type);
1635                 ir_tarval *tv   = get_mode_infinite(mode);
1636                 ir_node   *res  = new_d_Const(dbgi, tv);
1637                 return res;
1638         }
1639         case BUILTIN_NAN: {
1640                 /* Ignore string for now... */
1641                 assert(is_type_function(function_type));
1642                 type_t    *type = function_type->function.return_type;
1643                 ir_mode   *mode = get_ir_mode_arithmetic(type);
1644                 ir_tarval *tv   = get_mode_NAN(mode);
1645                 ir_node   *res  = new_d_Const(dbgi, tv);
1646                 return res;
1647         }
1648         case BUILTIN_EXPECT: {
1649                 expression_t *argument = call->arguments->expression;
1650                 return _expression_to_firm(argument);
1651         }
1652         case BUILTIN_VA_END:
1653                 /* evaluate the argument of va_end for its side effects */
1654                 _expression_to_firm(call->arguments->expression);
1655                 return NULL;
1656         case BUILTIN_OBJECT_SIZE: {
1657                 /* determine value of "type" */
1658                 expression_t *type_expression = call->arguments->next->expression;
1659                 long          type_val        = fold_constant_to_int(type_expression);
1660                 type_t       *type            = function_type->function.return_type;
1661                 ir_mode      *mode            = get_ir_mode_arithmetic(type);
1662                 /* just produce a "I don't know" result */
1663                 ir_tarval    *result          = type_val & 2 ? get_mode_null(mode) :
1664                                                 get_mode_minus_one(mode);
1665
1666                 return new_d_Const(dbgi, result);
1667         }
1668         case BUILTIN_ROTL: {
1669                 ir_node *val  = expression_to_firm(call->arguments->expression);
1670                 ir_node *shf  = expression_to_firm(call->arguments->next->expression);
1671                 ir_mode *mode = get_irn_mode(val);
1672                 ir_mode *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1673                 return new_d_Rotl(dbgi, val, create_conv(dbgi, shf, mode_uint), mode);
1674         }
1675         case BUILTIN_ROTR: {
1676                 ir_node *val  = expression_to_firm(call->arguments->expression);
1677                 ir_node *shf  = expression_to_firm(call->arguments->next->expression);
1678                 ir_mode *mode = get_irn_mode(val);
1679                 ir_mode *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1680                 ir_node *c    = new_Const_long(mode_uint, get_mode_size_bits(mode));
1681                 ir_node *sub  = new_d_Sub(dbgi, c, create_conv(dbgi, shf, mode_uint), mode_uint);
1682                 return new_d_Rotl(dbgi, val, sub, mode);
1683         }
1684         case BUILTIN_FIRM:
1685                 break;
1686         case BUILTIN_LIBC:
1687         case BUILTIN_LIBC_CHECK:
1688                 panic("builtin did not produce an entity");
1689         }
1690         panic("invalid builtin found");
1691 }
1692
1693 /**
1694  * Transform a call expression.
1695  * Handles some special cases, like alloca() calls, which must be resolved
1696  * BEFORE the inlines runs. Inlining routines calling alloca() is dangerous,
1697  * 176.gcc for instance might allocate 2GB instead of 256 MB if alloca is not
1698  * handled right...
1699  */
1700 static ir_node *call_expression_to_firm(const call_expression_t *const call)
1701 {
1702         dbg_info *const dbgi = get_dbg_info(&call->base.source_position);
1703         assert(currently_reachable());
1704
1705         expression_t   *function = call->function;
1706         ir_node        *callee   = NULL;
1707         bool            firm_builtin = false;
1708         ir_builtin_kind firm_builtin_kind = ir_bk_trap;
1709         if (function->kind == EXPR_REFERENCE) {
1710                 const reference_expression_t *ref    = &function->reference;
1711                 entity_t                     *entity = ref->entity;
1712
1713                 if (entity->kind == ENTITY_FUNCTION) {
1714                         builtin_kind_t builtin = entity->function.btk;
1715                         if (builtin == BUILTIN_FIRM) {
1716                                 firm_builtin = true;
1717                                 firm_builtin_kind = entity->function.b.firm_builtin_kind;
1718                         } else if (builtin != BUILTIN_NONE && builtin != BUILTIN_LIBC
1719                                    && builtin != BUILTIN_LIBC_CHECK) {
1720                                 return process_builtin_call(call);
1721                         }
1722                 }
1723         }
1724         if (!firm_builtin)
1725                 callee = expression_to_firm(function);
1726
1727         type_t *type = skip_typeref(function->base.type);
1728         assert(is_type_pointer(type));
1729         pointer_type_t *pointer_type = &type->pointer;
1730         type_t         *points_to    = skip_typeref(pointer_type->points_to);
1731         assert(is_type_function(points_to));
1732         function_type_t *function_type = &points_to->function;
1733
1734         int      n_parameters    = 0;
1735         ir_type *ir_method_type  = get_ir_type((type_t*) function_type);
1736         ir_type *new_method_type = NULL;
1737         if (function_type->variadic || function_type->unspecified_parameters) {
1738                 const call_argument_t *argument = call->arguments;
1739                 for ( ; argument != NULL; argument = argument->next) {
1740                         ++n_parameters;
1741                 }
1742
1743                 /* we need to construct a new method type matching the call
1744                  * arguments... */
1745                 type_dbg_info *tdbgi = get_type_dbg_info_((const type_t*) function_type);
1746                 int n_res       = get_method_n_ress(ir_method_type);
1747                 new_method_type = new_d_type_method(n_parameters, n_res, tdbgi);
1748                 set_method_calling_convention(new_method_type,
1749                                get_method_calling_convention(ir_method_type));
1750                 set_method_additional_properties(new_method_type,
1751                                get_method_additional_properties(ir_method_type));
1752                 set_method_variadicity(new_method_type,
1753                                        get_method_variadicity(ir_method_type));
1754
1755                 for (int i = 0; i < n_res; ++i) {
1756                         set_method_res_type(new_method_type, i,
1757                                             get_method_res_type(ir_method_type, i));
1758                 }
1759                 argument = call->arguments;
1760                 for (int i = 0; i < n_parameters; ++i, argument = argument->next) {
1761                         expression_t *expression = argument->expression;
1762                         ir_type      *irtype     = get_ir_type(expression->base.type);
1763                         set_method_param_type(new_method_type, i, irtype);
1764                 }
1765                 ir_method_type = new_method_type;
1766         } else {
1767                 n_parameters = get_method_n_params(ir_method_type);
1768         }
1769
1770         ir_node *in[n_parameters];
1771
1772         const call_argument_t *argument = call->arguments;
1773         for (int n = 0; n < n_parameters; ++n) {
1774                 expression_t *expression = argument->expression;
1775                 ir_node      *arg_node   = expression_to_firm(expression);
1776
1777                 type_t *arg_type = skip_typeref(expression->base.type);
1778                 if (!is_type_compound(arg_type)) {
1779                         ir_mode *const mode = get_ir_mode_storage(arg_type);
1780                         arg_node = create_conv(dbgi, arg_node, mode);
1781                         arg_node = do_strict_conv(dbgi, arg_node);
1782                 }
1783
1784                 in[n] = arg_node;
1785
1786                 argument = argument->next;
1787         }
1788
1789         ir_node *store;
1790         if (function_type->modifiers & DM_CONST) {
1791                 store = get_irg_no_mem(current_ir_graph);
1792         } else {
1793                 store = get_store();
1794         }
1795
1796         ir_node *node;
1797         type_t  *return_type = skip_typeref(function_type->return_type);
1798         ir_node *result      = NULL;
1799         if (firm_builtin) {
1800                 node = new_d_Builtin(dbgi, store, n_parameters, in, firm_builtin_kind,
1801                                      ir_method_type);
1802                 if (! (function_type->modifiers & DM_CONST)) {
1803                         ir_node *mem = new_Proj(node, mode_M, pn_Builtin_M);
1804                         set_store(mem);
1805                 }
1806
1807                 if (!is_type_void(return_type)) {
1808                         assert(is_type_scalar(return_type));
1809                         ir_mode *mode = get_ir_mode_storage(return_type);
1810                         result = new_Proj(node, mode, pn_Builtin_max+1);
1811                         ir_mode *mode_arith = get_ir_mode_arithmetic(return_type);
1812                         result              = create_conv(NULL, result, mode_arith);
1813                 }
1814         } else {
1815                 node = new_d_Call(dbgi, store, callee, n_parameters, in, ir_method_type);
1816                 if (! (function_type->modifiers & DM_CONST)) {
1817                         ir_node *mem = new_Proj(node, mode_M, pn_Call_M);
1818                         set_store(mem);
1819                 }
1820
1821                 if (!is_type_void(return_type)) {
1822                         ir_node *const resproj    = new_Proj(node, mode_T, pn_Call_T_result);
1823                         ir_mode *const mode       = get_ir_mode_storage(return_type);
1824                         result                    = new_Proj(resproj, mode, 0);
1825                         ir_mode *const mode_arith = get_ir_mode_arithmetic(return_type);
1826                         result                    = create_conv(NULL, result, mode_arith);
1827                 }
1828         }
1829
1830         if (function_type->modifiers & DM_NORETURN) {
1831                 /* A dead end:  Keep the Call and the Block.  Also place all further
1832                  * nodes into a new and unreachable block. */
1833                 keep_alive(node);
1834                 keep_alive(get_cur_block());
1835                 ir_node *block = new_Block(0, NULL);
1836                 set_cur_block(block);
1837         }
1838
1839         return result;
1840 }
1841
1842 static ir_node *statement_to_firm(statement_t *statement);
1843 static ir_node *compound_statement_to_firm(compound_statement_t *compound);
1844
1845 static ir_node *expression_to_addr(const expression_t *expression);
1846 static ir_node *create_condition_evaluation(const expression_t *expression,
1847                                             ir_node *true_block,
1848                                             ir_node *false_block);
1849
1850 static void assign_value(dbg_info *dbgi, ir_node *addr, type_t *type,
1851                          ir_node *value)
1852 {
1853         if (!is_type_compound(type)) {
1854                 ir_mode *mode = get_ir_mode_storage(type);
1855                 value         = create_conv(dbgi, value, mode);
1856                 value         = do_strict_conv(dbgi, value);
1857         }
1858
1859         ir_node *memory = get_store();
1860
1861         if (is_type_scalar(type)) {
1862                 ir_cons_flags flags = type->base.qualifiers & TYPE_QUALIFIER_VOLATILE
1863                                       ? cons_volatile : cons_none;
1864                 ir_node  *store     = new_d_Store(dbgi, memory, addr, value, flags);
1865                 ir_node  *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
1866                 set_store(store_mem);
1867         } else {
1868                 ir_type *irtype    = get_ir_type(type);
1869                 ir_node *copyb     = new_d_CopyB(dbgi, memory, addr, value, irtype);
1870                 ir_node *copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
1871                 set_store(copyb_mem);
1872         }
1873 }
1874
1875 static ir_tarval *create_bitfield_mask(ir_mode *mode, int offset, int size)
1876 {
1877         ir_tarval *all_one   = get_mode_all_one(mode);
1878         int        mode_size = get_mode_size_bits(mode);
1879         ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1880
1881         assert(offset >= 0);
1882         assert(size   >= 0);
1883         assert(offset + size <= mode_size);
1884         if (size == mode_size) {
1885                 return all_one;
1886         }
1887
1888         long       shiftr    = get_mode_size_bits(mode) - size;
1889         long       shiftl    = offset;
1890         ir_tarval *tv_shiftr = new_tarval_from_long(shiftr, mode_uint);
1891         ir_tarval *tv_shiftl = new_tarval_from_long(shiftl, mode_uint);
1892         ir_tarval *mask0     = tarval_shr(all_one, tv_shiftr);
1893         ir_tarval *mask1     = tarval_shl(mask0, tv_shiftl);
1894
1895         return mask1;
1896 }
1897
1898 static ir_node *bitfield_store_to_firm(dbg_info *dbgi,
1899                 ir_entity *entity, ir_node *addr, ir_node *value, bool set_volatile,
1900                 bool need_return)
1901 {
1902         ir_type *entity_type = get_entity_type(entity);
1903         ir_type *base_type   = get_primitive_base_type(entity_type);
1904         ir_mode *mode        = get_type_mode(base_type);
1905         ir_mode *mode_uint   = atomic_modes[ATOMIC_TYPE_UINT];
1906
1907         value = create_conv(dbgi, value, mode);
1908
1909         /* kill upper bits of value and shift to right position */
1910         unsigned  bitoffset  = get_entity_offset_bits_remainder(entity);
1911         unsigned  bitsize    = get_mode_size_bits(get_type_mode(entity_type));
1912         unsigned  base_bits  = get_mode_size_bits(mode);
1913         unsigned  shiftwidth = base_bits - bitsize;
1914
1915         ir_node  *shiftcount = new_Const_long(mode_uint, shiftwidth);
1916         ir_node  *shiftl     = new_d_Shl(dbgi, value, shiftcount, mode);
1917
1918         unsigned  shrwidth   = base_bits - bitsize - bitoffset;
1919         ir_node  *shrconst   = new_Const_long(mode_uint, shrwidth);
1920         ir_node  *shiftr     = new_d_Shr(dbgi, shiftl, shrconst, mode);
1921
1922         /* load current value */
1923         ir_node   *mem             = get_store();
1924         ir_node   *load            = new_d_Load(dbgi, mem, addr, mode,
1925                                           set_volatile ? cons_volatile : cons_none);
1926         ir_node   *load_mem        = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1927         ir_node   *load_res        = new_d_Proj(dbgi, load, mode, pn_Load_res);
1928         ir_tarval *shift_mask      = create_bitfield_mask(mode, bitoffset, bitsize);
1929         ir_tarval *inv_mask        = tarval_not(shift_mask);
1930         ir_node   *inv_mask_node   = new_d_Const(dbgi, inv_mask);
1931         ir_node   *load_res_masked = new_d_And(dbgi, load_res, inv_mask_node, mode);
1932
1933         /* construct new value and store */
1934         ir_node *new_val   = new_d_Or(dbgi, load_res_masked, shiftr, mode);
1935         ir_node *store     = new_d_Store(dbgi, load_mem, addr, new_val,
1936                                          set_volatile ? cons_volatile : cons_none);
1937         ir_node *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
1938         set_store(store_mem);
1939
1940         if (!need_return)
1941                 return NULL;
1942
1943         ir_node *res_shr;
1944         ir_node *count_res_shr = new_Const_long(mode_uint, base_bits - bitsize);
1945         if (mode_is_signed(mode)) {
1946                 res_shr = new_d_Shrs(dbgi, shiftl, count_res_shr, mode);
1947         } else {
1948                 res_shr = new_d_Shr(dbgi, shiftl, count_res_shr, mode);
1949         }
1950         return res_shr;
1951 }
1952
1953 static ir_node *bitfield_extract_to_firm(const select_expression_t *expression,
1954                                          ir_node *addr)
1955 {
1956         dbg_info *dbgi      = get_dbg_info(&expression->base.source_position);
1957         entity_t *entity    = expression->compound_entry;
1958         type_t   *base_type = entity->declaration.type;
1959         ir_mode  *mode      = get_ir_mode_storage(base_type);
1960         ir_node  *mem       = get_store();
1961         ir_node  *load      = new_d_Load(dbgi, mem, addr, mode, cons_none);
1962         ir_node  *load_mem  = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1963         ir_node  *load_res  = new_d_Proj(dbgi, load, mode, pn_Load_res);
1964         ir_mode  *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1965
1966         ir_mode  *amode     = mode;
1967         /* optimisation, since shifting in modes < machine_size is usually
1968          * less efficient */
1969         if (get_mode_size_bits(amode) < get_mode_size_bits(mode_uint)) {
1970                 amode = mode_uint;
1971         }
1972         unsigned amode_size = get_mode_size_bits(amode);
1973         load_res = create_conv(dbgi, load_res, amode);
1974
1975         set_store(load_mem);
1976
1977         /* kill upper bits */
1978         assert(expression->compound_entry->kind == ENTITY_COMPOUND_MEMBER);
1979         unsigned   bitoffset   = entity->compound_member.bit_offset;
1980         unsigned   bitsize     = entity->compound_member.bit_size;
1981         unsigned   shift_bitsl = amode_size - bitoffset - bitsize;
1982         ir_tarval *tvl         = new_tarval_from_long((long)shift_bitsl, mode_uint);
1983         ir_node   *countl      = new_d_Const(dbgi, tvl);
1984         ir_node   *shiftl      = new_d_Shl(dbgi, load_res, countl, amode);
1985
1986         unsigned   shift_bitsr = bitoffset + shift_bitsl;
1987         assert(shift_bitsr <= amode_size);
1988         ir_tarval *tvr         = new_tarval_from_long((long)shift_bitsr, mode_uint);
1989         ir_node   *countr      = new_d_Const(dbgi, tvr);
1990         ir_node   *shiftr;
1991         if (mode_is_signed(mode)) {
1992                 shiftr = new_d_Shrs(dbgi, shiftl, countr, amode);
1993         } else {
1994                 shiftr = new_d_Shr(dbgi, shiftl, countr, amode);
1995         }
1996
1997         type_t  *type    = expression->base.type;
1998         ir_mode *resmode = get_ir_mode_arithmetic(type);
1999         return create_conv(dbgi, shiftr, resmode);
2000 }
2001
2002 /* make sure the selected compound type is constructed */
2003 static void construct_select_compound(const select_expression_t *expression)
2004 {
2005         type_t *type = skip_typeref(expression->compound->base.type);
2006         if (is_type_pointer(type)) {
2007                 type = type->pointer.points_to;
2008         }
2009         (void) get_ir_type(type);
2010 }
2011
2012 static ir_node *set_value_for_expression_addr(const expression_t *expression,
2013                                               ir_node *value, ir_node *addr)
2014 {
2015         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2016         type_t   *type = skip_typeref(expression->base.type);
2017
2018         if (!is_type_compound(type)) {
2019                 ir_mode  *mode = get_ir_mode_storage(type);
2020                 value          = create_conv(dbgi, value, mode);
2021                 value          = do_strict_conv(dbgi, value);
2022         }
2023
2024         if (expression->kind == EXPR_REFERENCE) {
2025                 const reference_expression_t *ref = &expression->reference;
2026
2027                 entity_t *entity = ref->entity;
2028                 assert(is_declaration(entity));
2029                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2030                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE ||
2031                     entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
2032                         set_value(entity->variable.v.value_number, value);
2033                         return value;
2034                 }
2035         }
2036
2037         if (addr == NULL)
2038                 addr = expression_to_addr(expression);
2039         assert(addr != NULL);
2040
2041         if (expression->kind == EXPR_SELECT) {
2042                 const select_expression_t *select = &expression->select;
2043
2044                 construct_select_compound(select);
2045
2046                 entity_t *entity = select->compound_entry;
2047                 assert(entity->kind == ENTITY_COMPOUND_MEMBER);
2048                 if (entity->compound_member.bitfield) {
2049                         ir_entity *irentity = entity->compound_member.entity;
2050                         bool       set_volatile
2051                                 = select->base.type->base.qualifiers & TYPE_QUALIFIER_VOLATILE;
2052                         value = bitfield_store_to_firm(dbgi, irentity, addr, value,
2053                                                        set_volatile, true);
2054                         return value;
2055                 }
2056         }
2057
2058         assign_value(dbgi, addr, type, value);
2059         return value;
2060 }
2061
2062 static void set_value_for_expression(const expression_t *expression,
2063                                      ir_node *value)
2064 {
2065         set_value_for_expression_addr(expression, value, NULL);
2066 }
2067
2068 static ir_node *get_value_from_lvalue(const expression_t *expression,
2069                                       ir_node *addr)
2070 {
2071         if (expression->kind == EXPR_REFERENCE) {
2072                 const reference_expression_t *ref = &expression->reference;
2073
2074                 entity_t *entity = ref->entity;
2075                 assert(entity->kind == ENTITY_VARIABLE
2076                                 || entity->kind == ENTITY_PARAMETER);
2077                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2078                 int value_number;
2079                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE ||
2080                     entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
2081                         value_number = entity->variable.v.value_number;
2082                         assert(addr == NULL);
2083                         type_t  *type = skip_typeref(expression->base.type);
2084                         ir_mode *mode = get_ir_mode_storage(type);
2085                         ir_node *res  = get_value(value_number, mode);
2086                         return create_conv(NULL, res, get_ir_mode_arithmetic(type));
2087                 }
2088         }
2089
2090         assert(addr != NULL);
2091         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2092
2093         ir_node *value;
2094         if (expression->kind == EXPR_SELECT &&
2095             expression->select.compound_entry->compound_member.bitfield) {
2096             construct_select_compound(&expression->select);
2097                 value = bitfield_extract_to_firm(&expression->select, addr);
2098         } else {
2099                 value = deref_address(dbgi, expression->base.type, addr);
2100         }
2101
2102         return value;
2103 }
2104
2105
2106 static ir_node *create_incdec(const unary_expression_t *expression)
2107 {
2108         dbg_info *const     dbgi = get_dbg_info(&expression->base.source_position);
2109         const expression_t *value_expr = expression->value;
2110         ir_node            *addr       = expression_to_addr(value_expr);
2111         ir_node            *value      = get_value_from_lvalue(value_expr, addr);
2112
2113         type_t  *type = skip_typeref(expression->base.type);
2114         ir_mode *mode = get_ir_mode_arithmetic(expression->base.type);
2115
2116         ir_node *offset;
2117         if (is_type_pointer(type)) {
2118                 pointer_type_t *pointer_type = &type->pointer;
2119                 offset = get_type_size_node(pointer_type->points_to);
2120         } else {
2121                 assert(is_type_arithmetic(type));
2122                 offset = new_Const(get_mode_one(mode));
2123         }
2124
2125         ir_node *result;
2126         ir_node *store_value;
2127         switch(expression->base.kind) {
2128         case EXPR_UNARY_POSTFIX_INCREMENT:
2129                 result      = value;
2130                 store_value = new_d_Add(dbgi, value, offset, mode);
2131                 break;
2132         case EXPR_UNARY_POSTFIX_DECREMENT:
2133                 result      = value;
2134                 store_value = new_d_Sub(dbgi, value, offset, mode);
2135                 break;
2136         case EXPR_UNARY_PREFIX_INCREMENT:
2137                 result      = new_d_Add(dbgi, value, offset, mode);
2138                 store_value = result;
2139                 break;
2140         case EXPR_UNARY_PREFIX_DECREMENT:
2141                 result      = new_d_Sub(dbgi, value, offset, mode);
2142                 store_value = result;
2143                 break;
2144         default:
2145                 panic("no incdec expr in create_incdec");
2146         }
2147
2148         set_value_for_expression_addr(value_expr, store_value, addr);
2149
2150         return result;
2151 }
2152
2153 static bool is_local_variable(expression_t *expression)
2154 {
2155         if (expression->kind != EXPR_REFERENCE)
2156                 return false;
2157         reference_expression_t *ref_expr = &expression->reference;
2158         entity_t               *entity   = ref_expr->entity;
2159         if (entity->kind != ENTITY_VARIABLE)
2160                 return false;
2161         assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2162         return entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE;
2163 }
2164
2165 static ir_relation get_relation(const expression_kind_t kind)
2166 {
2167         switch(kind) {
2168         case EXPR_BINARY_EQUAL:         return ir_relation_equal;
2169         case EXPR_BINARY_ISLESSGREATER: return ir_relation_less_greater;
2170         case EXPR_BINARY_NOTEQUAL:      return ir_relation_unordered_less_greater;
2171         case EXPR_BINARY_ISLESS:
2172         case EXPR_BINARY_LESS:          return ir_relation_less;
2173         case EXPR_BINARY_ISLESSEQUAL:
2174         case EXPR_BINARY_LESSEQUAL:     return ir_relation_less_equal;
2175         case EXPR_BINARY_ISGREATER:
2176         case EXPR_BINARY_GREATER:       return ir_relation_greater;
2177         case EXPR_BINARY_ISGREATEREQUAL:
2178         case EXPR_BINARY_GREATEREQUAL:  return ir_relation_greater_equal;
2179         case EXPR_BINARY_ISUNORDERED:   return ir_relation_unordered;
2180
2181         default:
2182                 break;
2183         }
2184         panic("trying to get ir_relation from non-comparison binexpr type");
2185 }
2186
2187 /**
2188  * Handle the assume optimizer hint: check if a Confirm
2189  * node can be created.
2190  *
2191  * @param dbi    debug info
2192  * @param expr   the IL assume expression
2193  *
2194  * we support here only some simple cases:
2195  *  - var rel const
2196  *  - const rel val
2197  *  - var rel var
2198  */
2199 static ir_node *handle_assume_compare(dbg_info *dbi,
2200                                       const binary_expression_t *expression)
2201 {
2202         expression_t *op1 = expression->left;
2203         expression_t *op2 = expression->right;
2204         entity_t     *var2, *var = NULL;
2205         ir_node      *res      = NULL;
2206         ir_relation   relation = get_relation(expression->base.kind);
2207
2208         if (is_local_variable(op1) && is_local_variable(op2)) {
2209                 var  = op1->reference.entity;
2210             var2 = op2->reference.entity;
2211
2212                 type_t  *const type = skip_typeref(var->declaration.type);
2213                 ir_mode *const mode = get_ir_mode_storage(type);
2214
2215                 ir_node *const irn1 = get_value(var->variable.v.value_number, mode);
2216                 ir_node *const irn2 = get_value(var2->variable.v.value_number, mode);
2217
2218                 res = new_d_Confirm(dbi, irn2, irn1, get_inversed_relation(relation));
2219                 set_value(var2->variable.v.value_number, res);
2220
2221                 res = new_d_Confirm(dbi, irn1, irn2, relation);
2222                 set_value(var->variable.v.value_number, res);
2223
2224                 return res;
2225         }
2226
2227         expression_t *con = NULL;
2228         if (is_local_variable(op1) && is_constant_expression(op2) == EXPR_CLASS_CONSTANT) {
2229                 var = op1->reference.entity;
2230                 con = op2;
2231         } else if (is_constant_expression(op1) == EXPR_CLASS_CONSTANT && is_local_variable(op2)) {
2232                 relation = get_inversed_relation(relation);
2233                 var = op2->reference.entity;
2234                 con = op1;
2235         }
2236
2237         if (var != NULL) {
2238                 type_t  *const type = skip_typeref(var->declaration.type);
2239                 ir_mode *const mode = get_ir_mode_storage(type);
2240
2241                 res = get_value(var->variable.v.value_number, mode);
2242                 res = new_d_Confirm(dbi, res, expression_to_firm(con), relation);
2243                 set_value(var->variable.v.value_number, res);
2244         }
2245         return res;
2246 }
2247
2248 /**
2249  * Handle the assume optimizer hint.
2250  *
2251  * @param dbi    debug info
2252  * @param expr   the IL assume expression
2253  */
2254 static ir_node *handle_assume(dbg_info *dbi, const expression_t *expression)
2255 {
2256         switch(expression->kind) {
2257         case EXPR_BINARY_EQUAL:
2258         case EXPR_BINARY_NOTEQUAL:
2259         case EXPR_BINARY_LESS:
2260         case EXPR_BINARY_LESSEQUAL:
2261         case EXPR_BINARY_GREATER:
2262         case EXPR_BINARY_GREATEREQUAL:
2263                 return handle_assume_compare(dbi, &expression->binary);
2264         default:
2265                 return NULL;
2266         }
2267 }
2268
2269 static ir_node *create_cast(dbg_info *dbgi, ir_node *value_node,
2270                             type_t *from_type, type_t *type)
2271 {
2272         type = skip_typeref(type);
2273         if (is_type_void(type)) {
2274                 /* make sure firm type is constructed */
2275                 (void) get_ir_type(type);
2276                 return NULL;
2277         }
2278         if (!is_type_scalar(type)) {
2279                 /* make sure firm type is constructed */
2280                 (void) get_ir_type(type);
2281                 return value_node;
2282         }
2283
2284         from_type     = skip_typeref(from_type);
2285         ir_mode *mode = get_ir_mode_storage(type);
2286         /* check for conversion from / to __based types */
2287         if (is_type_pointer(type) && is_type_pointer(from_type)) {
2288                 const variable_t *from_var = from_type->pointer.base_variable;
2289                 const variable_t *to_var   = type->pointer.base_variable;
2290                 if (from_var != to_var) {
2291                         if (from_var != NULL) {
2292                                 ir_node *const addr = create_symconst(dbgi, from_var->v.entity);
2293                                 ir_node *const base = deref_address(dbgi, from_var->base.type, addr);
2294                                 value_node = new_d_Add(dbgi, value_node, base, mode);
2295                         }
2296                         if (to_var != NULL) {
2297                                 ir_node *const addr = create_symconst(dbgi, to_var->v.entity);
2298                                 ir_node *const base = deref_address(dbgi, to_var->base.type, addr);
2299                                 value_node = new_d_Sub(dbgi, value_node, base, mode);
2300                         }
2301                 }
2302         }
2303
2304         if (is_type_atomic(type, ATOMIC_TYPE_BOOL)) {
2305                 /* bool adjustments (we save a mode_Bu, but have to temporarily
2306                  * convert to mode_b so we only get a 0/1 value */
2307                 value_node = create_conv(dbgi, value_node, mode_b);
2308         }
2309
2310         ir_mode *mode_arith = get_ir_mode_arithmetic(type);
2311         ir_node *node       = create_conv(dbgi, value_node, mode);
2312         node                = do_strict_conv(dbgi, node);
2313         node                = create_conv(dbgi, node, mode_arith);
2314
2315         return node;
2316 }
2317
2318 static ir_node *unary_expression_to_firm(const unary_expression_t *expression)
2319 {
2320         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2321         type_t   *type = skip_typeref(expression->base.type);
2322
2323         const expression_t *value = expression->value;
2324
2325         switch(expression->base.kind) {
2326         case EXPR_UNARY_TAKE_ADDRESS:
2327                 return expression_to_addr(value);
2328
2329         case EXPR_UNARY_NEGATE: {
2330                 ir_node *value_node = expression_to_firm(value);
2331                 ir_mode *mode       = get_ir_mode_arithmetic(type);
2332                 return new_d_Minus(dbgi, value_node, mode);
2333         }
2334         case EXPR_UNARY_PLUS:
2335                 return expression_to_firm(value);
2336         case EXPR_UNARY_BITWISE_NEGATE: {
2337                 ir_node *value_node = expression_to_firm(value);
2338                 ir_mode *mode       = get_ir_mode_arithmetic(type);
2339                 return new_d_Not(dbgi, value_node, mode);
2340         }
2341         case EXPR_UNARY_NOT: {
2342                 ir_node *value_node = _expression_to_firm(value);
2343                 value_node          = create_conv(dbgi, value_node, mode_b);
2344                 ir_node *res        = new_d_Not(dbgi, value_node, mode_b);
2345                 return res;
2346         }
2347         case EXPR_UNARY_DEREFERENCE: {
2348                 ir_node *value_node = expression_to_firm(value);
2349                 type_t  *value_type = skip_typeref(value->base.type);
2350                 assert(is_type_pointer(value_type));
2351
2352                 /* check for __based */
2353                 const variable_t *const base_var = value_type->pointer.base_variable;
2354                 if (base_var != NULL) {
2355                         ir_node *const addr = create_symconst(dbgi, base_var->v.entity);
2356                         ir_node *const base = deref_address(dbgi, base_var->base.type, addr);
2357                         value_node = new_d_Add(dbgi, value_node, base, get_ir_mode_storage(value_type));
2358                 }
2359                 type_t  *points_to  = value_type->pointer.points_to;
2360                 return deref_address(dbgi, points_to, value_node);
2361         }
2362         case EXPR_UNARY_POSTFIX_INCREMENT:
2363         case EXPR_UNARY_POSTFIX_DECREMENT:
2364         case EXPR_UNARY_PREFIX_INCREMENT:
2365         case EXPR_UNARY_PREFIX_DECREMENT:
2366                 return create_incdec(expression);
2367         case EXPR_UNARY_CAST: {
2368                 ir_node *value_node = expression_to_firm(value);
2369                 type_t  *from_type  = value->base.type;
2370                 return create_cast(dbgi, value_node, from_type, type);
2371         }
2372         case EXPR_UNARY_ASSUME:
2373                 return handle_assume(dbgi, value);
2374
2375         default:
2376                 break;
2377         }
2378         panic("invalid UNEXPR type found");
2379 }
2380
2381 /**
2382  * produces a 0/1 depending of the value of a mode_b node
2383  */
2384 static ir_node *produce_condition_result(const expression_t *expression,
2385                                          ir_mode *mode, dbg_info *dbgi)
2386 {
2387         ir_node *const one_block  = new_immBlock();
2388         ir_node *const zero_block = new_immBlock();
2389         create_condition_evaluation(expression, one_block, zero_block);
2390         mature_immBlock(one_block);
2391         mature_immBlock(zero_block);
2392
2393         ir_node *const jmp_one  = new_rd_Jmp(dbgi, one_block);
2394         ir_node *const jmp_zero = new_rd_Jmp(dbgi, zero_block);
2395         ir_node *const in_cf[2] = { jmp_one, jmp_zero };
2396         ir_node *const block    = new_Block(lengthof(in_cf), in_cf);
2397         set_cur_block(block);
2398
2399         ir_node *const one   = new_Const(get_mode_one(mode));
2400         ir_node *const zero  = new_Const(get_mode_null(mode));
2401         ir_node *const in[2] = { one, zero };
2402         ir_node *const val   = new_d_Phi(dbgi, lengthof(in), in, mode);
2403
2404         return val;
2405 }
2406
2407 static ir_node *adjust_for_pointer_arithmetic(dbg_info *dbgi,
2408                 ir_node *value, type_t *type)
2409 {
2410         ir_mode        *const mode         = get_ir_mode_arithmetic(type_ptrdiff_t);
2411         assert(is_type_pointer(type));
2412         pointer_type_t *const pointer_type = &type->pointer;
2413         type_t         *const points_to    = skip_typeref(pointer_type->points_to);
2414         ir_node        *      elem_size    = get_type_size_node(points_to);
2415         elem_size                          = create_conv(dbgi, elem_size, mode);
2416         value                              = create_conv(dbgi, value,     mode);
2417         ir_node        *const mul          = new_d_Mul(dbgi, value, elem_size, mode);
2418         return mul;
2419 }
2420
2421 static ir_node *create_op(dbg_info *dbgi, const binary_expression_t *expression,
2422                           ir_node *left, ir_node *right)
2423 {
2424         ir_mode  *mode;
2425         type_t   *type_left  = skip_typeref(expression->left->base.type);
2426         type_t   *type_right = skip_typeref(expression->right->base.type);
2427
2428         expression_kind_t kind = expression->base.kind;
2429
2430         switch (kind) {
2431         case EXPR_BINARY_SHIFTLEFT:
2432         case EXPR_BINARY_SHIFTRIGHT:
2433         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2434         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2435                 mode  = get_ir_mode_arithmetic(expression->base.type);
2436                 right = create_conv(dbgi, right, atomic_modes[ATOMIC_TYPE_UINT]);
2437                 break;
2438
2439         case EXPR_BINARY_SUB:
2440                 if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
2441                         const pointer_type_t *const ptr_type = &type_left->pointer;
2442
2443                         mode = get_ir_mode_arithmetic(expression->base.type);
2444                         ir_node *const elem_size = get_type_size_node(ptr_type->points_to);
2445                         ir_node *const conv_size = new_d_Conv(dbgi, elem_size, mode);
2446                         ir_node *const sub       = new_d_Sub(dbgi, left, right, mode);
2447                         ir_node *const no_mem    = new_NoMem();
2448                         ir_node *const div       = new_d_DivRL(dbgi, no_mem, sub, conv_size,
2449                                                                                                    mode, op_pin_state_floats);
2450                         return new_d_Proj(dbgi, div, mode, pn_Div_res);
2451                 }
2452                 /* fallthrough */
2453         case EXPR_BINARY_SUB_ASSIGN:
2454                 if (is_type_pointer(type_left)) {
2455                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2456                         mode  = get_ir_mode_arithmetic(type_left);
2457                         break;
2458                 }
2459                 goto normal_node;
2460
2461         case EXPR_BINARY_ADD:
2462         case EXPR_BINARY_ADD_ASSIGN:
2463                 if (is_type_pointer(type_left)) {
2464                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2465                         mode  = get_ir_mode_arithmetic(type_left);
2466                         break;
2467                 } else if (is_type_pointer(type_right)) {
2468                         left  = adjust_for_pointer_arithmetic(dbgi, left, type_right);
2469                         mode  = get_ir_mode_arithmetic(type_right);
2470                         break;
2471                 }
2472                 goto normal_node;
2473
2474         default:
2475 normal_node:
2476                 mode = get_ir_mode_arithmetic(type_right);
2477                 left = create_conv(dbgi, left, mode);
2478                 break;
2479         }
2480
2481         switch (kind) {
2482         case EXPR_BINARY_ADD_ASSIGN:
2483         case EXPR_BINARY_ADD:
2484                 return new_d_Add(dbgi, left, right, mode);
2485         case EXPR_BINARY_SUB_ASSIGN:
2486         case EXPR_BINARY_SUB:
2487                 return new_d_Sub(dbgi, left, right, mode);
2488         case EXPR_BINARY_MUL_ASSIGN:
2489         case EXPR_BINARY_MUL:
2490                 return new_d_Mul(dbgi, left, right, mode);
2491         case EXPR_BINARY_BITWISE_AND:
2492         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2493                 return new_d_And(dbgi, left, right, mode);
2494         case EXPR_BINARY_BITWISE_OR:
2495         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2496                 return new_d_Or(dbgi, left, right, mode);
2497         case EXPR_BINARY_BITWISE_XOR:
2498         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2499                 return new_d_Eor(dbgi, left, right, mode);
2500         case EXPR_BINARY_SHIFTLEFT:
2501         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2502                 return new_d_Shl(dbgi, left, right, mode);
2503         case EXPR_BINARY_SHIFTRIGHT:
2504         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2505                 if (mode_is_signed(mode)) {
2506                         return new_d_Shrs(dbgi, left, right, mode);
2507                 } else {
2508                         return new_d_Shr(dbgi, left, right, mode);
2509                 }
2510         case EXPR_BINARY_DIV:
2511         case EXPR_BINARY_DIV_ASSIGN: {
2512                 ir_node *pin = new_Pin(new_NoMem());
2513                 ir_node *op  = new_d_Div(dbgi, pin, left, right, mode,
2514                                          op_pin_state_floats);
2515                 ir_node *res = new_d_Proj(dbgi, op, mode, pn_Div_res);
2516                 return res;
2517         }
2518         case EXPR_BINARY_MOD:
2519         case EXPR_BINARY_MOD_ASSIGN: {
2520                 ir_node *pin = new_Pin(new_NoMem());
2521                 ir_node *op  = new_d_Mod(dbgi, pin, left, right, mode,
2522                                          op_pin_state_floats);
2523                 ir_node *res = new_d_Proj(dbgi, op, mode, pn_Mod_res);
2524                 return res;
2525         }
2526         default:
2527                 panic("unexpected expression kind");
2528         }
2529 }
2530
2531 static ir_node *create_lazy_op(const binary_expression_t *expression)
2532 {
2533         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2534         type_t   *type = skip_typeref(expression->base.type);
2535         ir_mode  *mode = get_ir_mode_arithmetic(type);
2536
2537         if (is_constant_expression(expression->left) == EXPR_CLASS_CONSTANT) {
2538                 bool val = fold_constant_to_bool(expression->left);
2539                 expression_kind_t ekind = expression->base.kind;
2540                 assert(ekind == EXPR_BINARY_LOGICAL_AND || ekind == EXPR_BINARY_LOGICAL_OR);
2541                 if (ekind == EXPR_BINARY_LOGICAL_AND) {
2542                         if (!val) {
2543                                 return new_Const(get_mode_null(mode));
2544                         }
2545                 } else {
2546                         if (val) {
2547                                 return new_Const(get_mode_one(mode));
2548                         }
2549                 }
2550
2551                 if (is_constant_expression(expression->right) == EXPR_CLASS_CONSTANT) {
2552                         bool valr = fold_constant_to_bool(expression->right);
2553                         return create_Const_from_bool(mode, valr);
2554                 }
2555
2556                 return produce_condition_result(expression->right, mode, dbgi);
2557         }
2558
2559         return produce_condition_result((const expression_t*) expression, mode,
2560                                         dbgi);
2561 }
2562
2563 typedef ir_node * (*create_arithmetic_func)(dbg_info *dbgi, ir_node *left,
2564                                             ir_node *right, ir_mode *mode);
2565
2566 static ir_node *create_assign_binop(const binary_expression_t *expression)
2567 {
2568         dbg_info *const     dbgi = get_dbg_info(&expression->base.source_position);
2569         const expression_t *left_expr = expression->left;
2570         type_t             *type      = skip_typeref(left_expr->base.type);
2571         ir_node            *right     = expression_to_firm(expression->right);
2572         ir_node            *left_addr = expression_to_addr(left_expr);
2573         ir_node            *left      = get_value_from_lvalue(left_expr, left_addr);
2574         ir_node            *result    = create_op(dbgi, expression, left, right);
2575
2576         result = create_cast(dbgi, result, expression->right->base.type, type);
2577         result = do_strict_conv(dbgi, result);
2578
2579         result = set_value_for_expression_addr(left_expr, result, left_addr);
2580
2581         if (!is_type_compound(type)) {
2582                 ir_mode *mode_arithmetic = get_ir_mode_arithmetic(type);
2583                 result = create_conv(dbgi, result, mode_arithmetic);
2584         }
2585         return result;
2586 }
2587
2588 static ir_node *binary_expression_to_firm(const binary_expression_t *expression)
2589 {
2590         expression_kind_t kind = expression->base.kind;
2591
2592         switch(kind) {
2593         case EXPR_BINARY_EQUAL:
2594         case EXPR_BINARY_NOTEQUAL:
2595         case EXPR_BINARY_LESS:
2596         case EXPR_BINARY_LESSEQUAL:
2597         case EXPR_BINARY_GREATER:
2598         case EXPR_BINARY_GREATEREQUAL:
2599         case EXPR_BINARY_ISGREATER:
2600         case EXPR_BINARY_ISGREATEREQUAL:
2601         case EXPR_BINARY_ISLESS:
2602         case EXPR_BINARY_ISLESSEQUAL:
2603         case EXPR_BINARY_ISLESSGREATER:
2604         case EXPR_BINARY_ISUNORDERED: {
2605                 dbg_info   *dbgi     = get_dbg_info(&expression->base.source_position);
2606                 ir_node    *left     = expression_to_firm(expression->left);
2607                 ir_node    *right    = expression_to_firm(expression->right);
2608                 ir_relation relation = get_relation(kind);
2609                 ir_node    *cmp      = new_d_Cmp(dbgi, left, right, relation);
2610                 return cmp;
2611         }
2612         case EXPR_BINARY_ASSIGN: {
2613                 ir_node *addr  = expression_to_addr(expression->left);
2614                 ir_node *right = expression_to_firm(expression->right);
2615                 ir_node *res
2616                         = set_value_for_expression_addr(expression->left, right, addr);
2617
2618                 type_t  *type            = skip_typeref(expression->base.type);
2619                 if (!is_type_compound(type)) {
2620                         ir_mode *mode_arithmetic = get_ir_mode_arithmetic(type);
2621                         res                      = create_conv(NULL, res, mode_arithmetic);
2622                 }
2623                 return res;
2624         }
2625         case EXPR_BINARY_ADD:
2626         case EXPR_BINARY_SUB:
2627         case EXPR_BINARY_MUL:
2628         case EXPR_BINARY_DIV:
2629         case EXPR_BINARY_MOD:
2630         case EXPR_BINARY_BITWISE_AND:
2631         case EXPR_BINARY_BITWISE_OR:
2632         case EXPR_BINARY_BITWISE_XOR:
2633         case EXPR_BINARY_SHIFTLEFT:
2634         case EXPR_BINARY_SHIFTRIGHT:
2635         {
2636                 dbg_info *dbgi  = get_dbg_info(&expression->base.source_position);
2637                 ir_node  *left  = expression_to_firm(expression->left);
2638                 ir_node  *right = expression_to_firm(expression->right);
2639                 return create_op(dbgi, expression, left, right);
2640         }
2641         case EXPR_BINARY_LOGICAL_AND:
2642         case EXPR_BINARY_LOGICAL_OR:
2643                 return create_lazy_op(expression);
2644         case EXPR_BINARY_COMMA:
2645                 /* create side effects of left side */
2646                 (void) expression_to_firm(expression->left);
2647                 return _expression_to_firm(expression->right);
2648
2649         case EXPR_BINARY_ADD_ASSIGN:
2650         case EXPR_BINARY_SUB_ASSIGN:
2651         case EXPR_BINARY_MUL_ASSIGN:
2652         case EXPR_BINARY_MOD_ASSIGN:
2653         case EXPR_BINARY_DIV_ASSIGN:
2654         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2655         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2656         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2657         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2658         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2659                 return create_assign_binop(expression);
2660         default:
2661                 panic("invalid binexpr type");
2662         }
2663 }
2664
2665 static ir_node *array_access_addr(const array_access_expression_t *expression)
2666 {
2667         dbg_info *dbgi        = get_dbg_info(&expression->base.source_position);
2668         ir_node  *base_addr   = expression_to_firm(expression->array_ref);
2669         ir_node  *offset      = expression_to_firm(expression->index);
2670         type_t   *ref_type    = skip_typeref(expression->array_ref->base.type);
2671         ir_node  *real_offset = adjust_for_pointer_arithmetic(dbgi, offset, ref_type);
2672         ir_node  *result      = new_d_Add(dbgi, base_addr, real_offset, mode_P_data);
2673
2674         return result;
2675 }
2676
2677 static ir_node *array_access_to_firm(
2678                 const array_access_expression_t *expression)
2679 {
2680         dbg_info *dbgi   = get_dbg_info(&expression->base.source_position);
2681         ir_node  *addr   = array_access_addr(expression);
2682         type_t   *type   = revert_automatic_type_conversion(
2683                         (const expression_t*) expression);
2684         type             = skip_typeref(type);
2685
2686         return deref_address(dbgi, type, addr);
2687 }
2688
2689 static long get_offsetof_offset(const offsetof_expression_t *expression)
2690 {
2691         type_t *orig_type = expression->type;
2692         long    offset    = 0;
2693
2694         designator_t *designator = expression->designator;
2695         for ( ; designator != NULL; designator = designator->next) {
2696                 type_t *type = skip_typeref(orig_type);
2697                 /* be sure the type is constructed */
2698                 (void) get_ir_type(type);
2699
2700                 if (designator->symbol != NULL) {
2701                         assert(is_type_compound(type));
2702                         symbol_t *symbol = designator->symbol;
2703
2704                         compound_t *compound = type->compound.compound;
2705                         entity_t   *iter     = compound->members.entities;
2706                         for (; iter->base.symbol != symbol; iter = iter->base.next) {}
2707
2708                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
2709                         assert(iter->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
2710                         offset += get_entity_offset(iter->compound_member.entity);
2711
2712                         orig_type = iter->declaration.type;
2713                 } else {
2714                         expression_t *array_index = designator->array_index;
2715                         assert(designator->array_index != NULL);
2716                         assert(is_type_array(type));
2717
2718                         long index         = fold_constant_to_int(array_index);
2719                         ir_type *arr_type  = get_ir_type(type);
2720                         ir_type *elem_type = get_array_element_type(arr_type);
2721                         long     elem_size = get_type_size_bytes(elem_type);
2722
2723                         offset += index * elem_size;
2724
2725                         orig_type = type->array.element_type;
2726                 }
2727         }
2728
2729         return offset;
2730 }
2731
2732 static ir_node *offsetof_to_firm(const offsetof_expression_t *expression)
2733 {
2734         ir_mode   *mode   = get_ir_mode_arithmetic(expression->base.type);
2735         long       offset = get_offsetof_offset(expression);
2736         ir_tarval *tv     = new_tarval_from_long(offset, mode);
2737         dbg_info  *dbgi   = get_dbg_info(&expression->base.source_position);
2738
2739         return new_d_Const(dbgi, tv);
2740 }
2741
2742 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
2743                                      ir_entity *entity, type_t *type);
2744 static ir_initializer_t *create_ir_initializer(
2745                 const initializer_t *initializer, type_t *type);
2746
2747 static ir_entity *create_initializer_entity(dbg_info *dbgi,
2748                                             initializer_t *initializer,
2749                                             type_t *type)
2750 {
2751         /* create the ir_initializer */
2752         ir_graph *const old_current_ir_graph = current_ir_graph;
2753         current_ir_graph = get_const_code_irg();
2754
2755         ir_initializer_t *irinitializer = create_ir_initializer(initializer, type);
2756
2757         assert(current_ir_graph == get_const_code_irg());
2758         current_ir_graph = old_current_ir_graph;
2759
2760         ident     *const id          = id_unique("initializer.%u");
2761         ir_type   *const irtype      = get_ir_type(type);
2762         ir_type   *const global_type = get_glob_type();
2763         ir_entity *const entity      = new_d_entity(global_type, id, irtype, dbgi);
2764         set_entity_ld_ident(entity, id);
2765         set_entity_visibility(entity, ir_visibility_private);
2766         add_entity_linkage(entity, IR_LINKAGE_CONSTANT);
2767         set_entity_initializer(entity, irinitializer);
2768         return entity;
2769 }
2770
2771 static ir_node *compound_literal_addr(compound_literal_expression_t const *const expression)
2772 {
2773         dbg_info      *dbgi        = get_dbg_info(&expression->base.source_position);
2774         type_t        *type        = expression->type;
2775         initializer_t *initializer = expression->initializer;
2776
2777         if (is_constant_initializer(initializer) == EXPR_CLASS_CONSTANT) {
2778                 ir_entity *entity = create_initializer_entity(dbgi, initializer, type);
2779                 return create_symconst(dbgi, entity);
2780         } else {
2781                 /* create an entity on the stack */
2782                 ident   *const id     = id_unique("CompLit.%u");
2783                 ir_type *const irtype = get_ir_type(type);
2784                 ir_type *frame_type   = get_irg_frame_type(current_ir_graph);
2785
2786                 ir_entity *const entity = new_d_entity(frame_type, id, irtype, dbgi);
2787                 set_entity_ld_ident(entity, id);
2788
2789                 /* create initialisation code */
2790                 create_local_initializer(initializer, dbgi, entity, type);
2791
2792                 /* create a sel for the compound literal address */
2793                 ir_node *frame = get_irg_frame(current_ir_graph);
2794                 ir_node *sel   = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
2795                 return sel;
2796         }
2797 }
2798
2799 static ir_node *compound_literal_to_firm(compound_literal_expression_t const* const expr)
2800 {
2801         dbg_info *const dbgi = get_dbg_info(&expr->base.source_position);
2802         type_t   *const type = expr->type;
2803         ir_node  *const addr = compound_literal_addr(expr);
2804         return deref_address(dbgi, type, addr);
2805 }
2806
2807 /**
2808  * Transform a sizeof expression into Firm code.
2809  */
2810 static ir_node *sizeof_to_firm(const typeprop_expression_t *expression)
2811 {
2812         type_t *const type = skip_typeref(expression->type);
2813         /* §6.5.3.4:2 if the type is a VLA, evaluate the expression. */
2814         if (is_type_array(type) && type->array.is_vla
2815                         && expression->tp_expression != NULL) {
2816                 expression_to_firm(expression->tp_expression);
2817         }
2818
2819         return get_type_size_node(type);
2820 }
2821
2822 static entity_t *get_expression_entity(const expression_t *expression)
2823 {
2824         if (expression->kind != EXPR_REFERENCE)
2825                 return NULL;
2826
2827         return expression->reference.entity;
2828 }
2829
2830 static unsigned get_cparser_entity_alignment(const entity_t *entity)
2831 {
2832         switch(entity->kind) {
2833         case DECLARATION_KIND_CASES:
2834                 return entity->declaration.alignment;
2835         case ENTITY_STRUCT:
2836         case ENTITY_UNION:
2837                 return entity->compound.alignment;
2838         case ENTITY_TYPEDEF:
2839                 return entity->typedefe.alignment;
2840         default:
2841                 break;
2842         }
2843         return 0;
2844 }
2845
2846 /**
2847  * Transform an alignof expression into Firm code.
2848  */
2849 static ir_node *alignof_to_firm(const typeprop_expression_t *expression)
2850 {
2851         unsigned alignment = 0;
2852
2853         const expression_t *tp_expression = expression->tp_expression;
2854         if (tp_expression != NULL) {
2855                 entity_t *entity = get_expression_entity(tp_expression);
2856                 if (entity != NULL) {
2857                         alignment = get_cparser_entity_alignment(entity);
2858                 }
2859         }
2860
2861         if (alignment == 0) {
2862                 type_t *type = expression->type;
2863                 alignment = get_type_alignment(type);
2864         }
2865
2866         dbg_info  *dbgi = get_dbg_info(&expression->base.source_position);
2867         ir_mode   *mode = get_ir_mode_arithmetic(expression->base.type);
2868         ir_tarval *tv   = new_tarval_from_long(alignment, mode);
2869         return new_d_Const(dbgi, tv);
2870 }
2871
2872 static void init_ir_types(void);
2873
2874 static ir_tarval *fold_constant_to_tarval(const expression_t *expression)
2875 {
2876         assert(is_constant_expression(expression) == EXPR_CLASS_CONSTANT);
2877
2878         bool constant_folding_old = constant_folding;
2879         constant_folding = true;
2880         int old_optimize         = get_optimize();
2881         int old_constant_folding = get_opt_constant_folding();
2882         set_optimize(1);
2883         set_opt_constant_folding(1);
2884
2885         init_ir_types();
2886
2887         ir_graph *old_current_ir_graph = current_ir_graph;
2888         current_ir_graph = get_const_code_irg();
2889
2890         ir_node *const cnst = _expression_to_firm(expression);
2891
2892         current_ir_graph = old_current_ir_graph;
2893         set_optimize(old_optimize);
2894         set_opt_constant_folding(old_constant_folding);
2895
2896         if (!is_Const(cnst)) {
2897                 panic("couldn't fold constant");
2898         }
2899
2900         constant_folding = constant_folding_old;
2901
2902         ir_tarval *const tv   = get_Const_tarval(cnst);
2903         ir_mode   *const mode = get_ir_mode_arithmetic(skip_typeref(expression->base.type));
2904         return tarval_convert_to(tv, mode);
2905 }
2906
2907 /* this function is only used in parser.c, but it relies on libfirm functionality */
2908 bool constant_is_negative(const expression_t *expression)
2909 {
2910         ir_tarval *tv = fold_constant_to_tarval(expression);
2911         return tarval_is_negative(tv);
2912 }
2913
2914 long fold_constant_to_int(const expression_t *expression)
2915 {
2916         ir_tarval *tv = fold_constant_to_tarval(expression);
2917         if (!tarval_is_long(tv)) {
2918                 panic("result of constant folding is not integer");
2919         }
2920
2921         return get_tarval_long(tv);
2922 }
2923
2924 bool fold_constant_to_bool(const expression_t *expression)
2925 {
2926         ir_tarval *tv = fold_constant_to_tarval(expression);
2927         return !tarval_is_null(tv);
2928 }
2929
2930 static ir_node *conditional_to_firm(const conditional_expression_t *expression)
2931 {
2932         dbg_info *const dbgi = get_dbg_info(&expression->base.source_position);
2933
2934         /* first try to fold a constant condition */
2935         if (is_constant_expression(expression->condition) == EXPR_CLASS_CONSTANT) {
2936                 bool val = fold_constant_to_bool(expression->condition);
2937                 if (val) {
2938                         expression_t *true_expression = expression->true_expression;
2939                         if (true_expression == NULL)
2940                                 true_expression = expression->condition;
2941                         return expression_to_firm(true_expression);
2942                 } else {
2943                         return expression_to_firm(expression->false_expression);
2944                 }
2945         }
2946
2947         ir_node *const true_block  = new_immBlock();
2948         ir_node *const false_block = new_immBlock();
2949         ir_node *const cond_expr   = create_condition_evaluation(expression->condition, true_block, false_block);
2950         mature_immBlock(true_block);
2951         mature_immBlock(false_block);
2952
2953         set_cur_block(true_block);
2954         ir_node *true_val;
2955         if (expression->true_expression != NULL) {
2956                 true_val = expression_to_firm(expression->true_expression);
2957         } else if (cond_expr != NULL && get_irn_mode(cond_expr) != mode_b) {
2958                 true_val = cond_expr;
2959         } else {
2960                 /* Condition ended with a short circuit (&&, ||, !) operation or a
2961                  * comparison.  Generate a "1" as value for the true branch. */
2962                 true_val = new_Const(get_mode_one(mode_Is));
2963         }
2964         ir_node *const true_jmp = new_d_Jmp(dbgi);
2965
2966         set_cur_block(false_block);
2967         ir_node *const false_val = expression_to_firm(expression->false_expression);
2968         ir_node *const false_jmp = new_d_Jmp(dbgi);
2969
2970         /* create the common block */
2971         ir_node *const in_cf[2] = { true_jmp, false_jmp };
2972         ir_node *const block    = new_Block(lengthof(in_cf), in_cf);
2973         set_cur_block(block);
2974
2975         /* TODO improve static semantics, so either both or no values are NULL */
2976         if (true_val == NULL || false_val == NULL)
2977                 return NULL;
2978
2979         ir_node *const in[2] = { true_val, false_val };
2980         type_t  *const type  = skip_typeref(expression->base.type);
2981         ir_mode *const mode  = get_ir_mode_arithmetic(type);
2982         ir_node *const val   = new_d_Phi(dbgi, lengthof(in), in, mode);
2983
2984         return val;
2985 }
2986
2987 /**
2988  * Returns an IR-node representing the address of a field.
2989  */
2990 static ir_node *select_addr(const select_expression_t *expression)
2991 {
2992         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2993
2994         construct_select_compound(expression);
2995
2996         ir_node *compound_addr = expression_to_firm(expression->compound);
2997
2998         entity_t *entry = expression->compound_entry;
2999         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3000         assert(entry->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
3001
3002         if (constant_folding) {
3003                 ir_mode *mode      = get_irn_mode(compound_addr);
3004                 ir_mode *mode_uint = get_reference_mode_unsigned_eq(mode);
3005                 ir_node *ofs       = new_Const_long(mode_uint, entry->compound_member.offset);
3006                 return new_d_Add(dbgi, compound_addr, ofs, mode);
3007         } else {
3008                 ir_entity *irentity = entry->compound_member.entity;
3009                 assert(irentity != NULL);
3010                 return new_d_simpleSel(dbgi, new_NoMem(), compound_addr, irentity);
3011         }
3012 }
3013
3014 static ir_node *select_to_firm(const select_expression_t *expression)
3015 {
3016         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3017         ir_node  *addr = select_addr(expression);
3018         type_t   *type = revert_automatic_type_conversion(
3019                         (const expression_t*) expression);
3020         type           = skip_typeref(type);
3021
3022         entity_t *entry = expression->compound_entry;
3023         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3024
3025         if (entry->compound_member.bitfield) {
3026                 return bitfield_extract_to_firm(expression, addr);
3027         }
3028
3029         return deref_address(dbgi, type, addr);
3030 }
3031
3032 /* Values returned by __builtin_classify_type. */
3033 typedef enum gcc_type_class
3034 {
3035         no_type_class = -1,
3036         void_type_class,
3037         integer_type_class,
3038         char_type_class,
3039         enumeral_type_class,
3040         boolean_type_class,
3041         pointer_type_class,
3042         reference_type_class,
3043         offset_type_class,
3044         real_type_class,
3045         complex_type_class,
3046         function_type_class,
3047         method_type_class,
3048         record_type_class,
3049         union_type_class,
3050         array_type_class,
3051         string_type_class,
3052         set_type_class,
3053         file_type_class,
3054         lang_type_class
3055 } gcc_type_class;
3056
3057 static ir_node *classify_type_to_firm(const classify_type_expression_t *const expr)
3058 {
3059         type_t *type = expr->type_expression->base.type;
3060
3061         /* FIXME gcc returns different values depending on whether compiling C or C++
3062          * e.g. int x[10] is pointer_type_class in C, but array_type_class in C++ */
3063         gcc_type_class tc;
3064         for (;;) {
3065                 type = skip_typeref(type);
3066                 switch (type->kind) {
3067                         case TYPE_ATOMIC: {
3068                                 const atomic_type_t *const atomic_type = &type->atomic;
3069                                 switch (atomic_type->akind) {
3070                                         /* should not be reached */
3071                                         case ATOMIC_TYPE_INVALID:
3072                                                 tc = no_type_class;
3073                                                 goto make_const;
3074
3075                                         /* gcc cannot do that */
3076                                         case ATOMIC_TYPE_VOID:
3077                                                 tc = void_type_class;
3078                                                 goto make_const;
3079
3080                                         case ATOMIC_TYPE_WCHAR_T:   /* gcc handles this as integer */
3081                                         case ATOMIC_TYPE_CHAR:      /* gcc handles this as integer */
3082                                         case ATOMIC_TYPE_SCHAR:     /* gcc handles this as integer */
3083                                         case ATOMIC_TYPE_UCHAR:     /* gcc handles this as integer */
3084                                         case ATOMIC_TYPE_SHORT:
3085                                         case ATOMIC_TYPE_USHORT:
3086                                         case ATOMIC_TYPE_INT:
3087                                         case ATOMIC_TYPE_UINT:
3088                                         case ATOMIC_TYPE_LONG:
3089                                         case ATOMIC_TYPE_ULONG:
3090                                         case ATOMIC_TYPE_LONGLONG:
3091                                         case ATOMIC_TYPE_ULONGLONG:
3092                                         case ATOMIC_TYPE_BOOL:      /* gcc handles this as integer */
3093                                                 tc = integer_type_class;
3094                                                 goto make_const;
3095
3096                                         case ATOMIC_TYPE_FLOAT:
3097                                         case ATOMIC_TYPE_DOUBLE:
3098                                         case ATOMIC_TYPE_LONG_DOUBLE:
3099                                                 tc = real_type_class;
3100                                                 goto make_const;
3101                                 }
3102                                 panic("Unexpected atomic type in classify_type_to_firm().");
3103                         }
3104
3105                         case TYPE_COMPLEX:         tc = complex_type_class; goto make_const;
3106                         case TYPE_IMAGINARY:       tc = complex_type_class; goto make_const;
3107                         case TYPE_ARRAY:           /* gcc handles this as pointer */
3108                         case TYPE_FUNCTION:        /* gcc handles this as pointer */
3109                         case TYPE_POINTER:         tc = pointer_type_class; goto make_const;
3110                         case TYPE_COMPOUND_STRUCT: tc = record_type_class;  goto make_const;
3111                         case TYPE_COMPOUND_UNION:  tc = union_type_class;   goto make_const;
3112
3113                         /* gcc handles this as integer */
3114                         case TYPE_ENUM:            tc = integer_type_class; goto make_const;
3115
3116                         /* gcc classifies the referenced type */
3117                         case TYPE_REFERENCE: type = type->reference.refers_to; continue;
3118
3119                         /* typedef/typeof should be skipped already */
3120                         case TYPE_TYPEDEF:
3121                         case TYPE_TYPEOF:
3122                         case TYPE_ERROR:
3123                                 break;
3124                 }
3125                 panic("unexpected TYPE classify_type_to_firm().");
3126         }
3127
3128 make_const:;
3129         dbg_info  *const dbgi = get_dbg_info(&expr->base.source_position);
3130         ir_mode   *const mode = atomic_modes[ATOMIC_TYPE_INT];
3131         ir_tarval *const tv   = new_tarval_from_long(tc, mode);
3132         return new_d_Const(dbgi, tv);
3133 }
3134
3135 static ir_node *function_name_to_firm(
3136                 const funcname_expression_t *const expr)
3137 {
3138         switch(expr->kind) {
3139         case FUNCNAME_FUNCTION:
3140         case FUNCNAME_PRETTY_FUNCTION:
3141         case FUNCNAME_FUNCDNAME:
3142                 if (current_function_name == NULL) {
3143                         source_position_t const *const src_pos = &expr->base.source_position;
3144                         char              const *const name    = current_function_entity->base.symbol->string;
3145                         string_t                 const string  = { name, strlen(name), STRING_ENCODING_CHAR };
3146                         current_function_name = string_to_firm(src_pos, "__func__.%u", &string);
3147                 }
3148                 return current_function_name;
3149         case FUNCNAME_FUNCSIG:
3150                 if (current_funcsig == NULL) {
3151                         source_position_t const *const src_pos = &expr->base.source_position;
3152                         ir_entity               *const ent     = get_irg_entity(current_ir_graph);
3153                         char              const *const name    = get_entity_ld_name(ent);
3154                         string_t                 const string  = { name, strlen(name), STRING_ENCODING_CHAR };
3155                         current_funcsig = string_to_firm(src_pos, "__FUNCSIG__.%u", &string);
3156                 }
3157                 return current_funcsig;
3158         }
3159         panic("Unsupported function name");
3160 }
3161
3162 static ir_node *statement_expression_to_firm(const statement_expression_t *expr)
3163 {
3164         statement_t *statement = expr->statement;
3165
3166         assert(statement->kind == STATEMENT_COMPOUND);
3167         return compound_statement_to_firm(&statement->compound);
3168 }
3169
3170 static ir_node *va_start_expression_to_firm(
3171         const va_start_expression_t *const expr)
3172 {
3173         ir_entity *param_ent = current_vararg_entity;
3174         if (param_ent == NULL) {
3175                 size_t   const n           = IR_VA_START_PARAMETER_NUMBER;
3176                 ir_type *const frame_type  = get_irg_frame_type(current_ir_graph);
3177                 ir_type *const param_type  = get_unknown_type();
3178                 param_ent = new_parameter_entity(frame_type, n, param_type);
3179                 current_vararg_entity = param_ent;
3180         }
3181
3182         ir_node  *const frame   = get_irg_frame(current_ir_graph);
3183         dbg_info *const dbgi    = get_dbg_info(&expr->base.source_position);
3184         ir_node  *const no_mem  = new_NoMem();
3185         ir_node  *const arg_sel = new_d_simpleSel(dbgi, no_mem, frame, param_ent);
3186
3187         set_value_for_expression(expr->ap, arg_sel);
3188
3189         return NULL;
3190 }
3191
3192 static ir_node *va_arg_expression_to_firm(const va_arg_expression_t *const expr)
3193 {
3194         type_t       *const type    = expr->base.type;
3195         expression_t *const ap_expr = expr->ap;
3196         ir_node      *const ap_addr = expression_to_addr(ap_expr);
3197         ir_node      *const ap      = get_value_from_lvalue(ap_expr, ap_addr);
3198         dbg_info     *const dbgi    = get_dbg_info(&expr->base.source_position);
3199         ir_node      *const res     = deref_address(dbgi, type, ap);
3200
3201         ir_node      *const cnst    = get_type_size_node(expr->base.type);
3202         ir_mode      *const mode    = get_irn_mode(cnst);
3203         ir_node      *const c1      = new_Const_long(mode, stack_param_align - 1);
3204         ir_node      *const c2      = new_d_Add(dbgi, cnst, c1, mode);
3205         ir_node      *const c3      = new_Const_long(mode, -(long)stack_param_align);
3206         ir_node      *const c4      = new_d_And(dbgi, c2, c3, mode);
3207         ir_node      *const add     = new_d_Add(dbgi, ap, c4, mode_P_data);
3208
3209         set_value_for_expression_addr(ap_expr, add, ap_addr);
3210
3211         return res;
3212 }
3213
3214 /**
3215  * Generate Firm for a va_copy expression.
3216  */
3217 static ir_node *va_copy_expression_to_firm(const va_copy_expression_t *const expr)
3218 {
3219         ir_node *const src = expression_to_firm(expr->src);
3220         set_value_for_expression(expr->dst, src);
3221         return NULL;
3222 }
3223
3224 static ir_node *dereference_addr(const unary_expression_t *const expression)
3225 {
3226         assert(expression->base.kind == EXPR_UNARY_DEREFERENCE);
3227         return expression_to_firm(expression->value);
3228 }
3229
3230 /**
3231  * Returns a IR-node representing an lvalue of the given expression.
3232  */
3233 static ir_node *expression_to_addr(const expression_t *expression)
3234 {
3235         switch(expression->kind) {
3236         case EXPR_ARRAY_ACCESS:
3237                 return array_access_addr(&expression->array_access);
3238         case EXPR_CALL:
3239                 return call_expression_to_firm(&expression->call);
3240         case EXPR_COMPOUND_LITERAL:
3241                 return compound_literal_addr(&expression->compound_literal);
3242         case EXPR_REFERENCE:
3243                 return reference_addr(&expression->reference);
3244         case EXPR_SELECT:
3245                 return select_addr(&expression->select);
3246         case EXPR_UNARY_DEREFERENCE:
3247                 return dereference_addr(&expression->unary);
3248         default:
3249                 break;
3250         }
3251         panic("trying to get address of non-lvalue");
3252 }
3253
3254 static ir_node *builtin_constant_to_firm(
3255                 const builtin_constant_expression_t *expression)
3256 {
3257         ir_mode *const mode = get_ir_mode_arithmetic(expression->base.type);
3258         bool     const v    = is_constant_expression(expression->value) == EXPR_CLASS_CONSTANT;
3259         return create_Const_from_bool(mode, v);
3260 }
3261
3262 static ir_node *builtin_types_compatible_to_firm(
3263                 const builtin_types_compatible_expression_t *expression)
3264 {
3265         type_t  *const left  = get_unqualified_type(skip_typeref(expression->left));
3266         type_t  *const right = get_unqualified_type(skip_typeref(expression->right));
3267         bool     const value = types_compatible(left, right);
3268         ir_mode *const mode  = get_ir_mode_arithmetic(expression->base.type);
3269         return create_Const_from_bool(mode, value);
3270 }
3271
3272 static ir_node *get_label_block(label_t *label)
3273 {
3274         if (label->block != NULL)
3275                 return label->block;
3276
3277         /* beware: might be called from create initializer with current_ir_graph
3278          * set to const_code_irg. */
3279         ir_graph *rem    = current_ir_graph;
3280         current_ir_graph = current_function;
3281
3282         ir_node *block = new_immBlock();
3283
3284         label->block = block;
3285
3286         ARR_APP1(label_t *, all_labels, label);
3287
3288         current_ir_graph = rem;
3289         return block;
3290 }
3291
3292 /**
3293  * Pointer to a label.  This is used for the
3294  * GNU address-of-label extension.
3295  */
3296 static ir_node *label_address_to_firm(const label_address_expression_t *label)
3297 {
3298         dbg_info  *dbgi   = get_dbg_info(&label->base.source_position);
3299         ir_node   *block  = get_label_block(label->label);
3300         ir_entity *entity = create_Block_entity(block);
3301
3302         symconst_symbol value;
3303         value.entity_p = entity;
3304         return new_d_SymConst(dbgi, mode_P_code, value, symconst_addr_ent);
3305 }
3306
3307 /**
3308  * creates firm nodes for an expression. The difference between this function
3309  * and expression_to_firm is, that this version might produce mode_b nodes
3310  * instead of mode_Is.
3311  */
3312 static ir_node *_expression_to_firm(expression_t const *const expr)
3313 {
3314 #ifndef NDEBUG
3315         if (!constant_folding) {
3316                 assert(!expr->base.transformed);
3317                 ((expression_t*)expr)->base.transformed = true;
3318         }
3319 #endif
3320
3321         switch (expr->kind) {
3322         case EXPR_ALIGNOF:                    return alignof_to_firm(                 &expr->typeprop);
3323         case EXPR_ARRAY_ACCESS:               return array_access_to_firm(            &expr->array_access);
3324         case EXPR_BINARY_CASES:               return binary_expression_to_firm(       &expr->binary);
3325         case EXPR_BUILTIN_CONSTANT_P:         return builtin_constant_to_firm(        &expr->builtin_constant);
3326         case EXPR_BUILTIN_TYPES_COMPATIBLE_P: return builtin_types_compatible_to_firm(&expr->builtin_types_compatible);
3327         case EXPR_CALL:                       return call_expression_to_firm(         &expr->call);
3328         case EXPR_CLASSIFY_TYPE:              return classify_type_to_firm(           &expr->classify_type);
3329         case EXPR_COMPOUND_LITERAL:           return compound_literal_to_firm(        &expr->compound_literal);
3330         case EXPR_CONDITIONAL:                return conditional_to_firm(             &expr->conditional);
3331         case EXPR_FUNCNAME:                   return function_name_to_firm(           &expr->funcname);
3332         case EXPR_LABEL_ADDRESS:              return label_address_to_firm(           &expr->label_address);
3333         case EXPR_LITERAL_CASES:              return literal_to_firm(                 &expr->literal);
3334         case EXPR_LITERAL_CHARACTER:          return char_literal_to_firm(            &expr->string_literal);
3335         case EXPR_OFFSETOF:                   return offsetof_to_firm(                &expr->offsetofe);
3336         case EXPR_REFERENCE:                  return reference_expression_to_firm(    &expr->reference);
3337         case EXPR_ENUM_CONSTANT:              return enum_constant_to_firm(           &expr->reference);
3338         case EXPR_SELECT:                     return select_to_firm(                  &expr->select);
3339         case EXPR_SIZEOF:                     return sizeof_to_firm(                  &expr->typeprop);
3340         case EXPR_STATEMENT:                  return statement_expression_to_firm(    &expr->statement);
3341         case EXPR_UNARY_CASES:                return unary_expression_to_firm(        &expr->unary);
3342         case EXPR_VA_ARG:                     return va_arg_expression_to_firm(       &expr->va_arge);
3343         case EXPR_VA_COPY:                    return va_copy_expression_to_firm(      &expr->va_copye);
3344         case EXPR_VA_START:                   return va_start_expression_to_firm(     &expr->va_starte);
3345
3346         case EXPR_STRING_LITERAL: return string_to_firm(&expr->base.source_position, "str.%u", &expr->string_literal.value);
3347
3348         case EXPR_ERROR: break;
3349         }
3350         panic("invalid expression found");
3351 }
3352
3353 /**
3354  * Check if a given expression is a GNU __builtin_expect() call.
3355  */
3356 static bool is_builtin_expect(const expression_t *expression)
3357 {
3358         if (expression->kind != EXPR_CALL)
3359                 return false;
3360
3361         expression_t *function = expression->call.function;
3362         if (function->kind != EXPR_REFERENCE)
3363                 return false;
3364         reference_expression_t *ref = &function->reference;
3365         if (ref->entity->kind         != ENTITY_FUNCTION ||
3366             ref->entity->function.btk != BUILTIN_EXPECT)
3367                 return false;
3368
3369         return true;
3370 }
3371
3372 static bool produces_mode_b(const expression_t *expression)
3373 {
3374         switch (expression->kind) {
3375         case EXPR_BINARY_EQUAL:
3376         case EXPR_BINARY_NOTEQUAL:
3377         case EXPR_BINARY_LESS:
3378         case EXPR_BINARY_LESSEQUAL:
3379         case EXPR_BINARY_GREATER:
3380         case EXPR_BINARY_GREATEREQUAL:
3381         case EXPR_BINARY_ISGREATER:
3382         case EXPR_BINARY_ISGREATEREQUAL:
3383         case EXPR_BINARY_ISLESS:
3384         case EXPR_BINARY_ISLESSEQUAL:
3385         case EXPR_BINARY_ISLESSGREATER:
3386         case EXPR_BINARY_ISUNORDERED:
3387         case EXPR_UNARY_NOT:
3388                 return true;
3389
3390         case EXPR_CALL:
3391                 if (is_builtin_expect(expression)) {
3392                         expression_t *argument = expression->call.arguments->expression;
3393                         return produces_mode_b(argument);
3394                 }
3395                 return false;
3396         case EXPR_BINARY_COMMA:
3397                 return produces_mode_b(expression->binary.right);
3398
3399         default:
3400                 return false;
3401         }
3402 }
3403
3404 static ir_node *expression_to_firm(const expression_t *expression)
3405 {
3406         if (!produces_mode_b(expression)) {
3407                 ir_node *res = _expression_to_firm(expression);
3408                 assert(res == NULL || get_irn_mode(res) != mode_b);
3409                 return res;
3410         }
3411
3412         if (is_constant_expression(expression) == EXPR_CLASS_CONSTANT) {
3413                 return new_Const(fold_constant_to_tarval(expression));
3414         }
3415
3416         /* we have to produce a 0/1 from the mode_b expression */
3417         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3418         ir_mode  *mode = get_ir_mode_arithmetic(expression->base.type);
3419         return produce_condition_result(expression, mode, dbgi);
3420 }
3421
3422 /**
3423  * create a short-circuit expression evaluation that tries to construct
3424  * efficient control flow structures for &&, || and ! expressions
3425  */
3426 static ir_node *create_condition_evaluation(const expression_t *expression,
3427                                             ir_node *true_block,
3428                                             ir_node *false_block)
3429 {
3430         switch(expression->kind) {
3431         case EXPR_UNARY_NOT: {
3432                 const unary_expression_t *unary_expression = &expression->unary;
3433                 create_condition_evaluation(unary_expression->value, false_block,
3434                                             true_block);
3435                 return NULL;
3436         }
3437         case EXPR_BINARY_LOGICAL_AND: {
3438                 const binary_expression_t *binary_expression = &expression->binary;
3439
3440                 ir_node *extra_block = new_immBlock();
3441                 create_condition_evaluation(binary_expression->left, extra_block,
3442                                             false_block);
3443                 mature_immBlock(extra_block);
3444                 set_cur_block(extra_block);
3445                 create_condition_evaluation(binary_expression->right, true_block,
3446                                             false_block);
3447                 return NULL;
3448         }
3449         case EXPR_BINARY_LOGICAL_OR: {
3450                 const binary_expression_t *binary_expression = &expression->binary;
3451
3452                 ir_node *extra_block = new_immBlock();
3453                 create_condition_evaluation(binary_expression->left, true_block,
3454                                             extra_block);
3455                 mature_immBlock(extra_block);
3456                 set_cur_block(extra_block);
3457                 create_condition_evaluation(binary_expression->right, true_block,
3458                                             false_block);
3459                 return NULL;
3460         }
3461         default:
3462                 break;
3463         }
3464
3465         dbg_info *dbgi       = get_dbg_info(&expression->base.source_position);
3466         ir_node  *cond_expr  = _expression_to_firm(expression);
3467         ir_node  *condition  = create_conv(dbgi, cond_expr, mode_b);
3468         ir_node  *cond       = new_d_Cond(dbgi, condition);
3469         ir_node  *true_proj  = new_d_Proj(dbgi, cond, mode_X, pn_Cond_true);
3470         ir_node  *false_proj = new_d_Proj(dbgi, cond, mode_X, pn_Cond_false);
3471
3472         /* set branch prediction info based on __builtin_expect */
3473         if (is_builtin_expect(expression) && is_Cond(cond)) {
3474                 call_argument_t *argument = expression->call.arguments->next;
3475                 if (is_constant_expression(argument->expression) == EXPR_CLASS_CONSTANT) {
3476                         bool               const cnst = fold_constant_to_bool(argument->expression);
3477                         cond_jmp_predicate const pred = cnst ? COND_JMP_PRED_TRUE : COND_JMP_PRED_FALSE;
3478                         set_Cond_jmp_pred(cond, pred);
3479                 }
3480         }
3481
3482         add_immBlock_pred(true_block, true_proj);
3483         add_immBlock_pred(false_block, false_proj);
3484
3485         set_unreachable_now();
3486         return cond_expr;
3487 }
3488
3489 static void create_variable_entity(entity_t *variable,
3490                                    declaration_kind_t declaration_kind,
3491                                    ir_type *parent_type)
3492 {
3493         assert(variable->kind == ENTITY_VARIABLE);
3494         type_t    *type = skip_typeref(variable->declaration.type);
3495
3496         ident     *const id        = new_id_from_str(variable->base.symbol->string);
3497         ir_type   *const irtype    = get_ir_type(type);
3498         dbg_info  *const dbgi      = get_dbg_info(&variable->base.source_position);
3499         ir_entity *const irentity  = new_d_entity(parent_type, id, irtype, dbgi);
3500         unsigned         alignment = variable->declaration.alignment;
3501
3502         set_entity_alignment(irentity, alignment);
3503
3504         handle_decl_modifiers(irentity, variable);
3505
3506         variable->declaration.kind  = (unsigned char) declaration_kind;
3507         variable->variable.v.entity = irentity;
3508         set_entity_ld_ident(irentity, create_ld_ident(variable));
3509
3510         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
3511                 set_entity_volatility(irentity, volatility_is_volatile);
3512         }
3513 }
3514
3515
3516 typedef struct type_path_entry_t type_path_entry_t;
3517 struct type_path_entry_t {
3518         type_t           *type;
3519         ir_initializer_t *initializer;
3520         size_t            index;
3521         entity_t         *compound_entry;
3522 };
3523
3524 typedef struct type_path_t type_path_t;
3525 struct type_path_t {
3526         type_path_entry_t *path;
3527         type_t            *top_type;
3528         bool               invalid;
3529 };
3530
3531 static __attribute__((unused)) void debug_print_type_path(const type_path_t *path)
3532 {
3533         size_t len = ARR_LEN(path->path);
3534
3535         for (size_t i = 0; i < len; ++i) {
3536                 const type_path_entry_t *entry = & path->path[i];
3537
3538                 type_t *type = skip_typeref(entry->type);
3539                 if (is_type_compound(type)) {
3540                         fprintf(stderr, ".%s", entry->compound_entry->base.symbol->string);
3541                 } else if (is_type_array(type)) {
3542                         fprintf(stderr, "[%u]", (unsigned) entry->index);
3543                 } else {
3544                         fprintf(stderr, "-INVALID-");
3545                 }
3546         }
3547         fprintf(stderr, "  (");
3548         print_type(path->top_type);
3549         fprintf(stderr, ")");
3550 }
3551
3552 static type_path_entry_t *get_type_path_top(const type_path_t *path)
3553 {
3554         size_t len = ARR_LEN(path->path);
3555         assert(len > 0);
3556         return & path->path[len-1];
3557 }
3558
3559 static type_path_entry_t *append_to_type_path(type_path_t *path)
3560 {
3561         size_t len = ARR_LEN(path->path);
3562         ARR_RESIZE(type_path_entry_t, path->path, len+1);
3563
3564         type_path_entry_t *result = & path->path[len];
3565         memset(result, 0, sizeof(result[0]));
3566         return result;
3567 }
3568
3569 static size_t get_compound_member_count(const compound_type_t *type)
3570 {
3571         compound_t *compound  = type->compound;
3572         size_t      n_members = 0;
3573         entity_t   *member    = compound->members.entities;
3574         for ( ; member != NULL; member = member->base.next) {
3575                 ++n_members;
3576         }
3577
3578         return n_members;
3579 }
3580
3581 static ir_initializer_t *get_initializer_entry(type_path_t *path)
3582 {
3583         type_t *orig_top_type = path->top_type;
3584         type_t *top_type      = skip_typeref(orig_top_type);
3585
3586         assert(is_type_compound(top_type) || is_type_array(top_type));
3587
3588         if (ARR_LEN(path->path) == 0) {
3589                 return NULL;
3590         } else {
3591                 type_path_entry_t *top         = get_type_path_top(path);
3592                 ir_initializer_t  *initializer = top->initializer;
3593                 return get_initializer_compound_value(initializer, top->index);
3594         }
3595 }
3596
3597 static void descend_into_subtype(type_path_t *path)
3598 {
3599         type_t *orig_top_type = path->top_type;
3600         type_t *top_type      = skip_typeref(orig_top_type);
3601
3602         assert(is_type_compound(top_type) || is_type_array(top_type));
3603
3604         ir_initializer_t *initializer = get_initializer_entry(path);
3605
3606         type_path_entry_t *top = append_to_type_path(path);
3607         top->type              = top_type;
3608
3609         size_t len;
3610
3611         if (is_type_compound(top_type)) {
3612                 compound_t *const compound = top_type->compound.compound;
3613                 entity_t   *const entry    = skip_unnamed_bitfields(compound->members.entities);
3614
3615                 top->compound_entry = entry;
3616                 top->index          = 0;
3617                 len                 = get_compound_member_count(&top_type->compound);
3618                 if (entry != NULL) {
3619                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3620                         path->top_type = entry->declaration.type;
3621                 }
3622         } else {
3623                 assert(is_type_array(top_type));
3624                 assert(top_type->array.size > 0);
3625
3626                 top->index     = 0;
3627                 path->top_type = top_type->array.element_type;
3628                 len            = top_type->array.size;
3629         }
3630         if (initializer == NULL
3631                         || get_initializer_kind(initializer) == IR_INITIALIZER_NULL) {
3632                 initializer = create_initializer_compound(len);
3633                 /* we have to set the entry at the 2nd latest path entry... */
3634                 size_t path_len = ARR_LEN(path->path);
3635                 assert(path_len >= 1);
3636                 if (path_len > 1) {
3637                         type_path_entry_t *entry        = & path->path[path_len-2];
3638                         ir_initializer_t  *tinitializer = entry->initializer;
3639                         set_initializer_compound_value(tinitializer, entry->index,
3640                                                        initializer);
3641                 }
3642         }
3643         top->initializer = initializer;
3644 }
3645
3646 static void ascend_from_subtype(type_path_t *path)
3647 {
3648         type_path_entry_t *top = get_type_path_top(path);
3649
3650         path->top_type = top->type;
3651
3652         size_t len = ARR_LEN(path->path);
3653         ARR_RESIZE(type_path_entry_t, path->path, len-1);
3654 }
3655
3656 static void walk_designator(type_path_t *path, const designator_t *designator)
3657 {
3658         /* designators start at current object type */
3659         ARR_RESIZE(type_path_entry_t, path->path, 1);
3660
3661         for ( ; designator != NULL; designator = designator->next) {
3662                 type_path_entry_t *top         = get_type_path_top(path);
3663                 type_t            *orig_type   = top->type;
3664                 type_t            *type        = skip_typeref(orig_type);
3665
3666                 if (designator->symbol != NULL) {
3667                         assert(is_type_compound(type));
3668                         size_t    index  = 0;
3669                         symbol_t *symbol = designator->symbol;
3670
3671                         compound_t *compound = type->compound.compound;
3672                         entity_t   *iter     = compound->members.entities;
3673                         for (; iter->base.symbol != symbol; iter = iter->base.next, ++index) {}
3674                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
3675
3676                         /* revert previous initialisations of other union elements */
3677                         if (type->kind == TYPE_COMPOUND_UNION) {
3678                                 ir_initializer_t *initializer = top->initializer;
3679                                 if (initializer != NULL
3680                                         && get_initializer_kind(initializer) == IR_INITIALIZER_COMPOUND) {
3681                                         /* are we writing to a new element? */
3682                                         ir_initializer_t *oldi
3683                                                 = get_initializer_compound_value(initializer, index);
3684                                         if (get_initializer_kind(oldi) == IR_INITIALIZER_NULL) {
3685                                                 /* clear initializer */
3686                                                 size_t len
3687                                                         = get_initializer_compound_n_entries(initializer);
3688                                                 ir_initializer_t *nulli = get_initializer_null();
3689                                                 for (size_t i = 0; i < len; ++i) {
3690                                                         set_initializer_compound_value(initializer, i,
3691                                                                                        nulli);
3692                                                 }
3693                                         }
3694                                 }
3695                         }
3696
3697                         top->type           = orig_type;
3698                         top->compound_entry = iter;
3699                         top->index          = index;
3700                         orig_type           = iter->declaration.type;
3701                 } else {
3702                         expression_t *array_index = designator->array_index;
3703                         assert(is_type_array(type));
3704
3705                         long index = fold_constant_to_int(array_index);
3706                         assert(0 <= index && (!type->array.size_constant || (size_t)index < type->array.size));
3707
3708                         top->type  = orig_type;
3709                         top->index = (size_t) index;
3710                         orig_type  = type->array.element_type;
3711                 }
3712                 path->top_type = orig_type;
3713
3714                 if (designator->next != NULL) {
3715                         descend_into_subtype(path);
3716                 }
3717         }
3718
3719         path->invalid  = false;
3720 }
3721
3722 static void advance_current_object(type_path_t *path)
3723 {
3724         if (path->invalid) {
3725                 /* TODO: handle this... */
3726                 panic("invalid initializer in ast2firm (excessive elements)");
3727         }
3728
3729         type_path_entry_t *top = get_type_path_top(path);
3730
3731         type_t *type = skip_typeref(top->type);
3732         if (is_type_union(type)) {
3733                 /* only the first element is initialized in unions */
3734                 top->compound_entry = NULL;
3735         } else if (is_type_struct(type)) {
3736                 entity_t *entry = top->compound_entry;
3737
3738                 top->index++;
3739                 entry               = skip_unnamed_bitfields(entry->base.next);
3740                 top->compound_entry = entry;
3741                 if (entry != NULL) {
3742                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3743                         path->top_type = entry->declaration.type;
3744                         return;
3745                 }
3746         } else {
3747                 assert(is_type_array(type));
3748
3749                 top->index++;
3750                 if (!type->array.size_constant || top->index < type->array.size) {
3751                         return;
3752                 }
3753         }
3754
3755         /* we're past the last member of the current sub-aggregate, try if we
3756          * can ascend in the type hierarchy and continue with another subobject */
3757         size_t len = ARR_LEN(path->path);
3758
3759         if (len > 1) {
3760                 ascend_from_subtype(path);
3761                 advance_current_object(path);
3762         } else {
3763                 path->invalid = true;
3764         }
3765 }
3766
3767
3768 static ir_initializer_t *create_ir_initializer_value(
3769                 const initializer_value_t *initializer)
3770 {
3771         if (is_type_compound(initializer->value->base.type)) {
3772                 panic("initializer creation for compounds not implemented yet");
3773         }
3774         type_t       *type = initializer->value->base.type;
3775         expression_t *expr = initializer->value;
3776         ir_node *value = expression_to_firm(expr);
3777         ir_mode *mode  = get_ir_mode_storage(type);
3778         value          = create_conv(NULL, value, mode);
3779         return create_initializer_const(value);
3780 }
3781
3782 /** test wether type can be initialized by a string constant */
3783 static bool is_string_type(type_t *type)
3784 {
3785         if (!is_type_array(type))
3786                 return false;
3787
3788         type_t *const inner = skip_typeref(type->array.element_type);
3789         return is_type_integer(inner);
3790 }
3791
3792 static ir_initializer_t *create_ir_initializer_list(
3793                 const initializer_list_t *initializer, type_t *type)
3794 {
3795         type_path_t path;
3796         memset(&path, 0, sizeof(path));
3797         path.top_type = type;
3798         path.path     = NEW_ARR_F(type_path_entry_t, 0);
3799
3800         descend_into_subtype(&path);
3801
3802         for (size_t i = 0; i < initializer->len; ++i) {
3803                 const initializer_t *sub_initializer = initializer->initializers[i];
3804
3805                 if (sub_initializer->kind == INITIALIZER_DESIGNATOR) {
3806                         walk_designator(&path, sub_initializer->designator.designator);
3807                         continue;
3808                 }
3809
3810                 if (sub_initializer->kind == INITIALIZER_VALUE) {
3811                         /* we might have to descend into types until we're at a scalar
3812                          * type */
3813                         while(true) {
3814                                 type_t *orig_top_type = path.top_type;
3815                                 type_t *top_type      = skip_typeref(orig_top_type);
3816
3817                                 if (is_type_scalar(top_type))
3818                                         break;
3819                                 descend_into_subtype(&path);
3820                         }
3821                 } else if (sub_initializer->kind == INITIALIZER_STRING) {
3822                         /* we might have to descend into types until we're at a scalar
3823                          * type */
3824                         while (true) {
3825                                 type_t *orig_top_type = path.top_type;
3826                                 type_t *top_type      = skip_typeref(orig_top_type);
3827
3828                                 if (is_string_type(top_type))
3829                                         break;
3830                                 descend_into_subtype(&path);
3831                         }
3832                 }
3833
3834                 ir_initializer_t *sub_irinitializer
3835                         = create_ir_initializer(sub_initializer, path.top_type);
3836
3837                 size_t path_len = ARR_LEN(path.path);
3838                 assert(path_len >= 1);
3839                 type_path_entry_t *entry        = & path.path[path_len-1];
3840                 ir_initializer_t  *tinitializer = entry->initializer;
3841                 set_initializer_compound_value(tinitializer, entry->index,
3842                                                sub_irinitializer);
3843
3844                 advance_current_object(&path);
3845         }
3846
3847         assert(ARR_LEN(path.path) >= 1);
3848         ir_initializer_t *result = path.path[0].initializer;
3849         DEL_ARR_F(path.path);
3850
3851         return result;
3852 }
3853
3854 static ir_initializer_t *create_ir_initializer_string(initializer_t const *const init, type_t *type)
3855 {
3856         type = skip_typeref(type);
3857
3858         assert(type->kind == TYPE_ARRAY);
3859         assert(type->array.size_constant);
3860         string_literal_expression_t const *const str = get_init_string(init);
3861         size_t            const str_len = str->value.size;
3862         size_t            const arr_len = type->array.size;
3863         ir_initializer_t *const irinit  = create_initializer_compound(arr_len);
3864         ir_mode          *const mode    = get_ir_mode_storage(type->array.element_type);
3865         char const       *      p       = str->value.begin;
3866         switch (str->value.encoding) {
3867         case STRING_ENCODING_CHAR:
3868                 for (size_t i = 0; i != arr_len; ++i) {
3869                         char              const c      = i < str_len ? *p++ : 0;
3870                         ir_tarval        *const tv     = new_tarval_from_long(c, mode);
3871                         ir_initializer_t *const tvinit = create_initializer_tarval(tv);
3872                         set_initializer_compound_value(irinit, i, tvinit);
3873                 }
3874                 break;
3875
3876         case STRING_ENCODING_WIDE:
3877                 for (size_t i = 0; i != arr_len; ++i) {
3878                         utf32             const c      = i < str_len ? read_utf8_char(&p) : 0;
3879                         ir_tarval        *const tv     = new_tarval_from_long(c, mode);
3880                         ir_initializer_t *const tvinit = create_initializer_tarval(tv);
3881                         set_initializer_compound_value(irinit, i, tvinit);
3882                 }
3883                 break;
3884         }
3885
3886         return irinit;
3887 }
3888
3889 static ir_initializer_t *create_ir_initializer(
3890                 const initializer_t *initializer, type_t *type)
3891 {
3892         switch(initializer->kind) {
3893                 case INITIALIZER_STRING:
3894                         return create_ir_initializer_string(initializer, type);
3895
3896                 case INITIALIZER_LIST:
3897                         return create_ir_initializer_list(&initializer->list, type);
3898
3899                 case INITIALIZER_VALUE:
3900                         return create_ir_initializer_value(&initializer->value);
3901
3902                 case INITIALIZER_DESIGNATOR:
3903                         panic("unexpected designator initializer found");
3904         }
3905         panic("unknown initializer");
3906 }
3907
3908 /** ANSI C §6.7.8:21: If there are fewer initializers [..] than there
3909  *  are elements [...] the remainder of the aggregate shall be initialized
3910  *  implicitly the same as objects that have static storage duration. */
3911 static void create_dynamic_null_initializer(ir_entity *entity, dbg_info *dbgi,
3912                 ir_node *base_addr)
3913 {
3914         /* for unions we must NOT do anything for null initializers */
3915         ir_type *owner = get_entity_owner(entity);
3916         if (is_Union_type(owner)) {
3917                 return;
3918         }
3919
3920         ir_type *ent_type = get_entity_type(entity);
3921         /* create sub-initializers for a compound type */
3922         if (is_compound_type(ent_type)) {
3923                 unsigned n_members = get_compound_n_members(ent_type);
3924                 for (unsigned n = 0; n < n_members; ++n) {
3925                         ir_entity *member = get_compound_member(ent_type, n);
3926                         ir_node   *addr   = new_d_simpleSel(dbgi, new_NoMem(), base_addr,
3927                                                                 member);
3928                         create_dynamic_null_initializer(member, dbgi, addr);
3929                 }
3930                 return;
3931         }
3932         if (is_Array_type(ent_type)) {
3933                 assert(has_array_upper_bound(ent_type, 0));
3934                 long n = get_array_upper_bound_int(ent_type, 0);
3935                 for (long i = 0; i < n; ++i) {
3936                         ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
3937                         ir_tarval *index_tv = new_tarval_from_long(i, mode_uint);
3938                         ir_node   *cnst     = new_d_Const(dbgi, index_tv);
3939                         ir_node   *in[1]    = { cnst };
3940                         ir_entity *arrent   = get_array_element_entity(ent_type);
3941                         ir_node   *addr     = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in,
3942                                                         arrent);
3943                         create_dynamic_null_initializer(arrent, dbgi, addr);
3944                 }
3945                 return;
3946         }
3947
3948         ir_mode *value_mode = get_type_mode(ent_type);
3949         ir_node *node       = new_Const(get_mode_null(value_mode));
3950
3951         /* is it a bitfield type? */
3952         if (is_Primitive_type(ent_type) &&
3953                         get_primitive_base_type(ent_type) != NULL) {
3954                 bitfield_store_to_firm(dbgi, entity, base_addr, node, false, false);
3955                 return;
3956         }
3957
3958         ir_node *mem    = get_store();
3959         ir_node *store  = new_d_Store(dbgi, mem, base_addr, node, cons_none);
3960         ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
3961         set_store(proj_m);
3962 }
3963
3964 static void create_dynamic_initializer_sub(ir_initializer_t *initializer,
3965                 ir_entity *entity, ir_type *type, dbg_info *dbgi, ir_node *base_addr)
3966 {
3967         switch(get_initializer_kind(initializer)) {
3968         case IR_INITIALIZER_NULL:
3969                 create_dynamic_null_initializer(entity, dbgi, base_addr);
3970                 return;
3971         case IR_INITIALIZER_CONST: {
3972                 ir_node *node     = get_initializer_const_value(initializer);
3973                 ir_type *ent_type = get_entity_type(entity);
3974
3975                 /* is it a bitfield type? */
3976                 if (is_Primitive_type(ent_type) &&
3977                                 get_primitive_base_type(ent_type) != NULL) {
3978                         bitfield_store_to_firm(dbgi, entity, base_addr, node, false, false);
3979                         return;
3980                 }
3981
3982                 assert(get_type_mode(type) == get_irn_mode(node));
3983                 ir_node *mem    = get_store();
3984                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, node, cons_none);
3985                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
3986                 set_store(proj_m);
3987                 return;
3988         }
3989         case IR_INITIALIZER_TARVAL: {
3990                 ir_tarval *tv       = get_initializer_tarval_value(initializer);
3991                 ir_node   *cnst     = new_d_Const(dbgi, tv);
3992                 ir_type   *ent_type = get_entity_type(entity);
3993
3994                 /* is it a bitfield type? */
3995                 if (is_Primitive_type(ent_type) &&
3996                                 get_primitive_base_type(ent_type) != NULL) {
3997                         bitfield_store_to_firm(dbgi, entity, base_addr, cnst, false, false);
3998                         return;
3999                 }
4000
4001                 assert(get_type_mode(type) == get_tarval_mode(tv));
4002                 ir_node *mem    = get_store();
4003                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, cnst, cons_none);
4004                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4005                 set_store(proj_m);
4006                 return;
4007         }
4008         case IR_INITIALIZER_COMPOUND: {
4009                 assert(is_compound_type(type) || is_Array_type(type));
4010                 int n_members;
4011                 if (is_Array_type(type)) {
4012                         assert(has_array_upper_bound(type, 0));
4013                         n_members = get_array_upper_bound_int(type, 0);
4014                 } else {
4015                         n_members = get_compound_n_members(type);
4016                 }
4017
4018                 if (get_initializer_compound_n_entries(initializer)
4019                                 != (unsigned) n_members)
4020                         panic("initializer doesn't match compound type");
4021
4022                 for (int i = 0; i < n_members; ++i) {
4023                         ir_node   *addr;
4024                         ir_type   *irtype;
4025                         ir_entity *sub_entity;
4026                         if (is_Array_type(type)) {
4027                                 ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
4028                                 ir_tarval *index_tv = new_tarval_from_long(i, mode_uint);
4029                                 ir_node   *cnst     = new_d_Const(dbgi, index_tv);
4030                                 ir_node   *in[1]    = { cnst };
4031                                 irtype     = get_array_element_type(type);
4032                                 sub_entity = get_array_element_entity(type);
4033                                 addr       = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in,
4034                                                        sub_entity);
4035                         } else {
4036                                 sub_entity = get_compound_member(type, i);
4037                                 irtype     = get_entity_type(sub_entity);
4038                                 addr       = new_d_simpleSel(dbgi, new_NoMem(), base_addr,
4039                                                              sub_entity);
4040                         }
4041
4042                         ir_initializer_t *sub_init
4043                                 = get_initializer_compound_value(initializer, i);
4044
4045                         create_dynamic_initializer_sub(sub_init, sub_entity, irtype, dbgi,
4046                                                        addr);
4047                 }
4048                 return;
4049         }
4050         }
4051
4052         panic("invalid IR_INITIALIZER found");
4053 }
4054
4055 static void create_dynamic_initializer(ir_initializer_t *initializer,
4056                 dbg_info *dbgi, ir_entity *entity)
4057 {
4058         ir_node *frame     = get_irg_frame(current_ir_graph);
4059         ir_node *base_addr = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
4060         ir_type *type      = get_entity_type(entity);
4061
4062         create_dynamic_initializer_sub(initializer, entity, type, dbgi, base_addr);
4063 }
4064
4065 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
4066                                      ir_entity *entity, type_t *type)
4067 {
4068         ir_node *memory = get_store();
4069         ir_node *nomem  = new_NoMem();
4070         ir_node *frame  = get_irg_frame(current_ir_graph);
4071         ir_node *addr   = new_d_simpleSel(dbgi, nomem, frame, entity);
4072
4073         if (initializer->kind == INITIALIZER_VALUE) {
4074                 initializer_value_t *initializer_value = &initializer->value;
4075
4076                 ir_node *value = expression_to_firm(initializer_value->value);
4077                 type = skip_typeref(type);
4078                 assign_value(dbgi, addr, type, value);
4079                 return;
4080         }
4081
4082         if (is_constant_initializer(initializer) == EXPR_CLASS_VARIABLE) {
4083                 ir_initializer_t *irinitializer
4084                         = create_ir_initializer(initializer, type);
4085
4086                 create_dynamic_initializer(irinitializer, dbgi, entity);
4087                 return;
4088         }
4089
4090         /* create a "template" entity which is copied to the entity on the stack */
4091         ir_entity *const init_entity
4092                 = create_initializer_entity(dbgi, initializer, type);
4093         ir_node *const src_addr = create_symconst(dbgi, init_entity);
4094         ir_type *const irtype   = get_ir_type(type);
4095         ir_node *const copyb    = new_d_CopyB(dbgi, memory, addr, src_addr, irtype);
4096
4097         ir_node *const copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
4098         set_store(copyb_mem);
4099 }
4100
4101 static void create_initializer_local_variable_entity(entity_t *entity)
4102 {
4103         assert(entity->kind == ENTITY_VARIABLE);
4104         initializer_t *initializer = entity->variable.initializer;
4105         dbg_info      *dbgi        = get_dbg_info(&entity->base.source_position);
4106         ir_entity     *irentity    = entity->variable.v.entity;
4107         type_t        *type        = entity->declaration.type;
4108
4109         create_local_initializer(initializer, dbgi, irentity, type);
4110 }
4111
4112 static void create_variable_initializer(entity_t *entity)
4113 {
4114         assert(entity->kind == ENTITY_VARIABLE);
4115         initializer_t *initializer = entity->variable.initializer;
4116         if (initializer == NULL)
4117                 return;
4118
4119         declaration_kind_t declaration_kind
4120                 = (declaration_kind_t) entity->declaration.kind;
4121         if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY) {
4122                 create_initializer_local_variable_entity(entity);
4123                 return;
4124         }
4125
4126         type_t            *type = entity->declaration.type;
4127         type_qualifiers_t  tq   = get_type_qualifier(type, true);
4128
4129         if (initializer->kind == INITIALIZER_VALUE) {
4130                 expression_t *      value     = initializer->value.value;
4131                 type_t       *const init_type = skip_typeref(value->base.type);
4132
4133                 if (!is_type_scalar(init_type)) {
4134                         /* skip convs */
4135                         while (value->kind == EXPR_UNARY_CAST)
4136                                 value = value->unary.value;
4137
4138                         if (value->kind != EXPR_COMPOUND_LITERAL)
4139                                 panic("expected non-scalar initializer to be a compound literal");
4140                         initializer = value->compound_literal.initializer;
4141                         goto have_initializer;
4142                 }
4143
4144                 ir_node  *      node = expression_to_firm(value);
4145                 dbg_info *const dbgi = get_dbg_info(&entity->base.source_position);
4146                 ir_mode  *const mode = get_ir_mode_storage(init_type);
4147                 node = create_conv(dbgi, node, mode);
4148                 node = do_strict_conv(dbgi, node);
4149
4150                 if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE) {
4151                         set_value(entity->variable.v.value_number, node);
4152                 } else {
4153                         assert(declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4154
4155                         ir_entity *irentity = entity->variable.v.entity;
4156
4157                         if (tq & TYPE_QUALIFIER_CONST
4158                                         && get_entity_owner(irentity) != get_tls_type()) {
4159                                 add_entity_linkage(irentity, IR_LINKAGE_CONSTANT);
4160                         }
4161                         set_atomic_ent_value(irentity, node);
4162                 }
4163         } else {
4164 have_initializer:
4165                 assert(declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY ||
4166                        declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4167
4168                 ir_entity        *irentity        = entity->variable.v.entity;
4169                 ir_initializer_t *irinitializer
4170                         = create_ir_initializer(initializer, type);
4171
4172                 if (tq & TYPE_QUALIFIER_CONST) {
4173                         add_entity_linkage(irentity, IR_LINKAGE_CONSTANT);
4174                 }
4175                 set_entity_initializer(irentity, irinitializer);
4176         }
4177 }
4178
4179 static void create_variable_length_array(entity_t *entity)
4180 {
4181         assert(entity->kind == ENTITY_VARIABLE);
4182         assert(entity->variable.initializer == NULL);
4183
4184         entity->declaration.kind    = DECLARATION_KIND_VARIABLE_LENGTH_ARRAY;
4185         entity->variable.v.vla_base = NULL;
4186
4187         /* TODO: record VLA somewhere so we create the free node when we leave
4188          * it's scope */
4189 }
4190
4191 static void allocate_variable_length_array(entity_t *entity)
4192 {
4193         assert(entity->kind == ENTITY_VARIABLE);
4194         assert(entity->variable.initializer == NULL);
4195         assert(currently_reachable());
4196
4197         dbg_info *dbgi      = get_dbg_info(&entity->base.source_position);
4198         type_t   *type      = entity->declaration.type;
4199         ir_type  *el_type   = get_ir_type(type->array.element_type);
4200
4201         /* make sure size_node is calculated */
4202         get_type_size_node(type);
4203         ir_node  *elems = type->array.size_node;
4204         ir_node  *mem   = get_store();
4205         ir_node  *alloc = new_d_Alloc(dbgi, mem, elems, el_type, stack_alloc);
4206
4207         ir_node  *proj_m = new_d_Proj(dbgi, alloc, mode_M, pn_Alloc_M);
4208         ir_node  *addr   = new_d_Proj(dbgi, alloc, mode_P_data, pn_Alloc_res);
4209         set_store(proj_m);
4210
4211         assert(entity->declaration.kind == DECLARATION_KIND_VARIABLE_LENGTH_ARRAY);
4212         entity->variable.v.vla_base = addr;
4213 }
4214
4215 /**
4216  * Creates a Firm local variable from a declaration.
4217  */
4218 static void create_local_variable(entity_t *entity)
4219 {
4220         assert(entity->kind == ENTITY_VARIABLE);
4221         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4222
4223         bool needs_entity = entity->variable.address_taken;
4224         type_t *type = skip_typeref(entity->declaration.type);
4225
4226         /* is it a variable length array? */
4227         if (is_type_array(type) && !type->array.size_constant) {
4228                 create_variable_length_array(entity);
4229                 return;
4230         } else if (is_type_array(type) || is_type_compound(type)) {
4231                 needs_entity = true;
4232         } else if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
4233                 needs_entity = true;
4234         }
4235
4236         if (needs_entity) {
4237                 ir_type *frame_type = get_irg_frame_type(current_ir_graph);
4238                 create_variable_entity(entity,
4239                                        DECLARATION_KIND_LOCAL_VARIABLE_ENTITY,
4240                                        frame_type);
4241         } else {
4242                 entity->declaration.kind        = DECLARATION_KIND_LOCAL_VARIABLE;
4243                 entity->variable.v.value_number = next_value_number_function;
4244                 set_irg_loc_description(current_ir_graph, next_value_number_function,
4245                                         entity);
4246                 ++next_value_number_function;
4247         }
4248 }
4249
4250 static void create_local_static_variable(entity_t *entity)
4251 {
4252         assert(entity->kind == ENTITY_VARIABLE);
4253         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4254
4255         type_t   *type           = skip_typeref(entity->declaration.type);
4256         ir_type  *const var_type = entity->variable.thread_local ?
4257                 get_tls_type() : get_glob_type();
4258         ir_type  *const irtype   = get_ir_type(type);
4259         dbg_info *const dbgi     = get_dbg_info(&entity->base.source_position);
4260
4261         size_t l = strlen(entity->base.symbol->string);
4262         char   buf[l + sizeof(".%u")];
4263         snprintf(buf, sizeof(buf), "%s.%%u", entity->base.symbol->string);
4264         ident     *const id       = id_unique(buf);
4265         ir_entity *const irentity = new_d_entity(var_type, id, irtype, dbgi);
4266
4267         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
4268                 set_entity_volatility(irentity, volatility_is_volatile);
4269         }
4270
4271         entity->declaration.kind  = DECLARATION_KIND_GLOBAL_VARIABLE;
4272         entity->variable.v.entity = irentity;
4273
4274         set_entity_ld_ident(irentity, id);
4275         set_entity_visibility(irentity, ir_visibility_local);
4276
4277         if (entity->variable.initializer == NULL) {
4278                 ir_initializer_t *null_init = get_initializer_null();
4279                 set_entity_initializer(irentity, null_init);
4280         }
4281
4282         ir_graph *const old_current_ir_graph = current_ir_graph;
4283         current_ir_graph = get_const_code_irg();
4284
4285         create_variable_initializer(entity);
4286
4287         assert(current_ir_graph == get_const_code_irg());
4288         current_ir_graph = old_current_ir_graph;
4289 }
4290
4291
4292
4293 static ir_node *return_statement_to_firm(return_statement_t *statement)
4294 {
4295         if (!currently_reachable())
4296                 return NULL;
4297
4298         dbg_info *const dbgi = get_dbg_info(&statement->base.source_position);
4299         type_t   *const type = skip_typeref(current_function_entity->declaration.type->function.return_type);
4300         ir_node  *      res  = statement->value ? expression_to_firm(statement->value) : NULL;
4301
4302         int in_len;
4303         if (!is_type_void(type)) {
4304                 ir_mode *const mode = get_ir_mode_storage(type);
4305                 if (res) {
4306                         res = create_conv(dbgi, res, mode);
4307                         res = do_strict_conv(dbgi, res);
4308                 } else {
4309                         res = new_Unknown(mode);
4310                 }
4311                 in_len = 1;
4312         } else {
4313                 in_len = 0;
4314         }
4315
4316         ir_node *const in[1] = { res };
4317         ir_node *const store = get_store();
4318         ir_node *const ret   = new_d_Return(dbgi, store, in_len, in);
4319
4320         ir_node *end_block = get_irg_end_block(current_ir_graph);
4321         add_immBlock_pred(end_block, ret);
4322
4323         set_unreachable_now();
4324         return NULL;
4325 }
4326
4327 static ir_node *expression_statement_to_firm(expression_statement_t *statement)
4328 {
4329         if (!currently_reachable())
4330                 return NULL;
4331
4332         return expression_to_firm(statement->expression);
4333 }
4334
4335 static void create_local_declarations(entity_t*);
4336
4337 static ir_node *compound_statement_to_firm(compound_statement_t *compound)
4338 {
4339         create_local_declarations(compound->scope.entities);
4340
4341         ir_node     *result    = NULL;
4342         statement_t *statement = compound->statements;
4343         for ( ; statement != NULL; statement = statement->base.next) {
4344                 result = statement_to_firm(statement);
4345         }
4346
4347         return result;
4348 }
4349
4350 static void create_global_variable(entity_t *entity)
4351 {
4352         ir_linkage          linkage    = IR_LINKAGE_DEFAULT;
4353         ir_visibility       visibility = ir_visibility_external;
4354         storage_class_tag_t storage
4355                 = (storage_class_tag_t)entity->declaration.storage_class;
4356         decl_modifiers_t    modifiers  = entity->declaration.modifiers;
4357         assert(entity->kind == ENTITY_VARIABLE);
4358
4359         switch (storage) {
4360         case STORAGE_CLASS_EXTERN: visibility = ir_visibility_external; break;
4361         case STORAGE_CLASS_STATIC: visibility = ir_visibility_local;    break;
4362         case STORAGE_CLASS_NONE:   visibility = ir_visibility_external; break;
4363         case STORAGE_CLASS_TYPEDEF:
4364         case STORAGE_CLASS_AUTO:
4365         case STORAGE_CLASS_REGISTER:
4366                 panic("invalid storage class for global var");
4367         }
4368
4369         /* "common" symbols */
4370         if (storage == STORAGE_CLASS_NONE
4371             && entity->variable.initializer == NULL
4372             && !entity->variable.thread_local
4373             && (modifiers & DM_WEAK) == 0) {
4374                 linkage |= IR_LINKAGE_MERGE;
4375         }
4376
4377         ir_type *var_type = get_glob_type();
4378         if (entity->variable.thread_local) {
4379                 var_type = get_tls_type();
4380         }
4381         create_variable_entity(entity, DECLARATION_KIND_GLOBAL_VARIABLE, var_type);
4382         ir_entity *irentity = entity->variable.v.entity;
4383         add_entity_linkage(irentity, linkage);
4384         set_entity_visibility(irentity, visibility);
4385         if (entity->variable.initializer == NULL
4386             && storage != STORAGE_CLASS_EXTERN) {
4387                 ir_initializer_t *null_init = get_initializer_null();
4388                 set_entity_initializer(irentity, null_init);
4389         }
4390 }
4391
4392 static void create_local_declaration(entity_t *entity)
4393 {
4394         assert(is_declaration(entity));
4395
4396         /* construct type */
4397         (void) get_ir_type(entity->declaration.type);
4398         if (entity->base.symbol == NULL) {
4399                 return;
4400         }
4401
4402         switch ((storage_class_tag_t) entity->declaration.storage_class) {
4403         case STORAGE_CLASS_STATIC:
4404                 if (entity->kind == ENTITY_FUNCTION) {
4405                         (void)get_function_entity(entity, NULL);
4406                 } else {
4407                         create_local_static_variable(entity);
4408                 }
4409                 return;
4410         case STORAGE_CLASS_EXTERN:
4411                 if (entity->kind == ENTITY_FUNCTION) {
4412                         assert(entity->function.statement == NULL);
4413                         (void)get_function_entity(entity, NULL);
4414                 } else {
4415                         create_global_variable(entity);
4416                         create_variable_initializer(entity);
4417                 }
4418                 return;
4419         case STORAGE_CLASS_NONE:
4420         case STORAGE_CLASS_AUTO:
4421         case STORAGE_CLASS_REGISTER:
4422                 if (entity->kind == ENTITY_FUNCTION) {
4423                         if (entity->function.statement != NULL) {
4424                                 ir_type *owner = get_irg_frame_type(current_ir_graph);
4425                                 (void)get_function_entity(entity, owner);
4426                                 entity->declaration.kind = DECLARATION_KIND_INNER_FUNCTION;
4427                                 enqueue_inner_function(entity);
4428                         } else {
4429                                 (void)get_function_entity(entity, NULL);
4430                         }
4431                 } else {
4432                         create_local_variable(entity);
4433                 }
4434                 return;
4435         case STORAGE_CLASS_TYPEDEF:
4436                 break;
4437         }
4438         panic("invalid storage class found");
4439 }
4440
4441 static void create_local_declarations(entity_t *e)
4442 {
4443         for (; e; e = e->base.next) {
4444                 if (is_declaration(e))
4445                         create_local_declaration(e);
4446         }
4447 }
4448
4449 static void initialize_local_declaration(entity_t *entity)
4450 {
4451         if (entity->base.symbol == NULL)
4452                 return;
4453
4454         // no need to emit code in dead blocks
4455         if (entity->declaration.storage_class != STORAGE_CLASS_STATIC
4456                         && !currently_reachable())
4457                 return;
4458
4459         switch ((declaration_kind_t) entity->declaration.kind) {
4460         case DECLARATION_KIND_LOCAL_VARIABLE:
4461         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY:
4462                 create_variable_initializer(entity);
4463                 return;
4464
4465         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
4466                 allocate_variable_length_array(entity);
4467                 return;
4468
4469         case DECLARATION_KIND_COMPOUND_MEMBER:
4470         case DECLARATION_KIND_GLOBAL_VARIABLE:
4471         case DECLARATION_KIND_FUNCTION:
4472         case DECLARATION_KIND_INNER_FUNCTION:
4473                 return;
4474
4475         case DECLARATION_KIND_PARAMETER:
4476         case DECLARATION_KIND_PARAMETER_ENTITY:
4477                 panic("can't initialize parameters");
4478
4479         case DECLARATION_KIND_UNKNOWN:
4480                 panic("can't initialize unknown declaration");
4481         }
4482         panic("invalid declaration kind");
4483 }
4484
4485 static ir_node *declaration_statement_to_firm(declaration_statement_t *statement)
4486 {
4487         entity_t *entity = statement->declarations_begin;
4488         if (entity == NULL)
4489                 return NULL;
4490
4491         entity_t *const last = statement->declarations_end;
4492         for ( ;; entity = entity->base.next) {
4493                 if (is_declaration(entity)) {
4494                         initialize_local_declaration(entity);
4495                 } else if (entity->kind == ENTITY_TYPEDEF) {
4496                         /* §6.7.7:3  Any array size expressions associated with variable length
4497                          * array declarators are evaluated each time the declaration of the
4498                          * typedef name is reached in the order of execution. */
4499                         type_t *const type = skip_typeref(entity->typedefe.type);
4500                         if (is_type_array(type) && type->array.is_vla)
4501                                 get_vla_size(&type->array);
4502                 }
4503                 if (entity == last)
4504                         break;
4505         }
4506
4507         return NULL;
4508 }
4509
4510 static ir_node *if_statement_to_firm(if_statement_t *statement)
4511 {
4512         create_local_declarations(statement->scope.entities);
4513
4514         /* Create the condition. */
4515         ir_node *true_block  = NULL;
4516         ir_node *false_block = NULL;
4517         if (currently_reachable()) {
4518                 true_block  = new_immBlock();
4519                 false_block = new_immBlock();
4520                 create_condition_evaluation(statement->condition, true_block, false_block);
4521                 mature_immBlock(true_block);
4522                 mature_immBlock(false_block);
4523         }
4524
4525         /* Create the true statement. */
4526         set_cur_block(true_block);
4527         statement_to_firm(statement->true_statement);
4528         ir_node *fallthrough_block = get_cur_block();
4529
4530         /* Create the false statement. */
4531         set_cur_block(false_block);
4532         if (statement->false_statement != NULL) {
4533                 statement_to_firm(statement->false_statement);
4534         }
4535
4536         /* Handle the block after the if-statement.  Minor simplification and
4537          * optimisation: Reuse the false/true block as fallthrough block, if the
4538          * true/false statement does not pass control to the fallthrough block, e.g.
4539          * in the typical if (x) return; pattern. */
4540         if (fallthrough_block) {
4541                 if (currently_reachable()) {
4542                         ir_node *const t_jump = new_r_Jmp(fallthrough_block);
4543                         ir_node *const f_jump = new_Jmp();
4544                         ir_node *const in[]   = { t_jump, f_jump };
4545                         fallthrough_block = new_Block(2, in);
4546                 }
4547                 set_cur_block(fallthrough_block);
4548         }
4549
4550         return NULL;
4551 }
4552
4553 /**
4554  * Add an unconditional jump to the target block.  If the source block is not
4555  * reachable, then a Bad predecessor is created to prevent Phi-less unreachable
4556  * loops.  This is necessary if the jump potentially enters a loop.
4557  */
4558 static void jump_to(ir_node *const target_block)
4559 {
4560         ir_node *const pred = currently_reachable() ? new_Jmp() : new_Bad(mode_X);
4561         add_immBlock_pred(target_block, pred);
4562 }
4563
4564 /**
4565  * Add an unconditional jump to the target block, if the current block is
4566  * reachable and do nothing otherwise.  This is only valid if the jump does not
4567  * enter a loop (a back edge is ok).
4568  */
4569 static void jump_if_reachable(ir_node *const target_block)
4570 {
4571         if (currently_reachable())
4572                 add_immBlock_pred(target_block, new_Jmp());
4573 }
4574
4575 static ir_node *while_statement_to_firm(while_statement_t *statement)
4576 {
4577         create_local_declarations(statement->scope.entities);
4578
4579         /* Create the header block */
4580         ir_node *const header_block = new_immBlock();
4581         jump_to(header_block);
4582
4583         /* Create the condition. */
4584         ir_node      *      body_block;
4585         ir_node      *      false_block;
4586         expression_t *const cond = statement->condition;
4587         if (is_constant_expression(cond) == EXPR_CLASS_CONSTANT &&
4588                         fold_constant_to_bool(cond)) {
4589                 /* Shortcut for while (true). */
4590                 body_block  = header_block;
4591                 false_block = NULL;
4592
4593                 keep_alive(header_block);
4594                 keep_all_memory(header_block);
4595         } else {
4596                 body_block  = new_immBlock();
4597                 false_block = new_immBlock();
4598
4599                 set_cur_block(header_block);
4600                 create_condition_evaluation(cond, body_block, false_block);
4601                 mature_immBlock(body_block);
4602         }
4603
4604         ir_node *const old_continue_label = continue_label;
4605         ir_node *const old_break_label    = break_label;
4606         continue_label = header_block;
4607         break_label    = false_block;
4608
4609         /* Create the loop body. */
4610         set_cur_block(body_block);
4611         statement_to_firm(statement->body);
4612         jump_if_reachable(header_block);
4613
4614         mature_immBlock(header_block);
4615         assert(false_block == NULL || false_block == break_label);
4616         false_block = break_label;
4617         if (false_block != NULL) {
4618                 mature_immBlock(false_block);
4619         }
4620         set_cur_block(false_block);
4621
4622         assert(continue_label == header_block);
4623         continue_label = old_continue_label;
4624         break_label    = old_break_label;
4625         return NULL;
4626 }
4627
4628 static ir_node *get_break_label(void)
4629 {
4630         if (break_label == NULL) {
4631                 break_label = new_immBlock();
4632         }
4633         return break_label;
4634 }
4635
4636 static ir_node *do_while_statement_to_firm(do_while_statement_t *statement)
4637 {
4638         create_local_declarations(statement->scope.entities);
4639
4640         /* create the header block */
4641         ir_node *header_block = new_immBlock();
4642
4643         /* the loop body */
4644         ir_node *body_block = new_immBlock();
4645         jump_to(body_block);
4646
4647         ir_node *old_continue_label = continue_label;
4648         ir_node *old_break_label    = break_label;
4649         continue_label              = header_block;
4650         break_label                 = NULL;
4651
4652         set_cur_block(body_block);
4653         statement_to_firm(statement->body);
4654         ir_node *const false_block = get_break_label();
4655
4656         assert(continue_label == header_block);
4657         continue_label = old_continue_label;
4658         break_label    = old_break_label;
4659
4660         jump_if_reachable(header_block);
4661
4662         /* create the condition */
4663         mature_immBlock(header_block);
4664         set_cur_block(header_block);
4665
4666         create_condition_evaluation(statement->condition, body_block, false_block);
4667         mature_immBlock(body_block);
4668         mature_immBlock(false_block);
4669
4670         set_cur_block(false_block);
4671         return NULL;
4672 }
4673
4674 static ir_node *for_statement_to_firm(for_statement_t *statement)
4675 {
4676         create_local_declarations(statement->scope.entities);
4677
4678         if (currently_reachable()) {
4679                 entity_t *entity = statement->scope.entities;
4680                 for ( ; entity != NULL; entity = entity->base.next) {
4681                         if (!is_declaration(entity))
4682                                 continue;
4683
4684                         initialize_local_declaration(entity);
4685                 }
4686
4687                 if (statement->initialisation != NULL) {
4688                         expression_to_firm(statement->initialisation);
4689                 }
4690         }
4691
4692         /* Create the header block */
4693         ir_node *const header_block = new_immBlock();
4694         jump_to(header_block);
4695
4696         /* Create the condition. */
4697         ir_node *body_block;
4698         ir_node *false_block;
4699         if (statement->condition != NULL) {
4700                 body_block  = new_immBlock();
4701                 false_block = new_immBlock();
4702
4703                 set_cur_block(header_block);
4704                 create_condition_evaluation(statement->condition, body_block, false_block);
4705                 mature_immBlock(body_block);
4706         } else {
4707                 /* for-ever. */
4708                 body_block  = header_block;
4709                 false_block = NULL;
4710
4711                 keep_alive(header_block);
4712                 keep_all_memory(header_block);
4713         }
4714
4715         /* Create the step block, if necessary. */
4716         ir_node      *      step_block = header_block;
4717         expression_t *const step       = statement->step;
4718         if (step != NULL) {
4719                 step_block = new_immBlock();
4720         }
4721
4722         ir_node *const old_continue_label = continue_label;
4723         ir_node *const old_break_label    = break_label;
4724         continue_label = step_block;
4725         break_label    = false_block;
4726
4727         /* Create the loop body. */
4728         set_cur_block(body_block);
4729         statement_to_firm(statement->body);
4730         jump_if_reachable(step_block);
4731
4732         /* Create the step code. */
4733         if (step != NULL) {
4734                 mature_immBlock(step_block);
4735                 set_cur_block(step_block);
4736                 expression_to_firm(step);
4737                 jump_if_reachable(header_block);
4738         }
4739
4740         mature_immBlock(header_block);
4741         assert(false_block == NULL || false_block == break_label);
4742         false_block = break_label;
4743         if (false_block != NULL) {
4744                 mature_immBlock(false_block);
4745         }
4746         set_cur_block(false_block);
4747
4748         assert(continue_label == step_block);
4749         continue_label = old_continue_label;
4750         break_label    = old_break_label;
4751         return NULL;
4752 }
4753
4754 static ir_node *create_jump_statement(const statement_t *statement, ir_node *target_block)
4755 {
4756         if (!currently_reachable())
4757                 return NULL;
4758
4759         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
4760         ir_node  *jump = new_d_Jmp(dbgi);
4761         add_immBlock_pred(target_block, jump);
4762
4763         set_unreachable_now();
4764         return NULL;
4765 }
4766
4767 static ir_switch_table *create_switch_table(const switch_statement_t *statement)
4768 {
4769         /* determine number of cases */
4770         size_t n_cases = 0;
4771         for (case_label_statement_t *l = statement->first_case; l != NULL;
4772              l = l->next) {
4773                 /* default case */
4774                 if (l->expression == NULL)
4775                         continue;
4776                 if (l->is_empty_range)
4777                         continue;
4778                 ++n_cases;
4779         }
4780
4781         ir_switch_table *res = ir_new_switch_table(current_ir_graph, n_cases);
4782         size_t           i   = 0;
4783         for (case_label_statement_t *l = statement->first_case; l != NULL;
4784              l = l->next) {
4785             if (l->expression == NULL) {
4786                         l->pn = pn_Switch_default;
4787                         continue;
4788                 }
4789                 if (l->is_empty_range)
4790                         continue;
4791                 ir_tarval *min = fold_constant_to_tarval(l->expression);
4792                 ir_tarval *max = min;
4793                 long       pn  = (long) i+1;
4794                 if (l->end_range != NULL)
4795                         max = fold_constant_to_tarval(l->end_range);
4796                 ir_switch_table_set(res, i++, min, max, pn);
4797                 l->pn = pn;
4798         }
4799         return res;
4800 }
4801
4802 static ir_node *switch_statement_to_firm(switch_statement_t *statement)
4803 {
4804         dbg_info *dbgi        = get_dbg_info(&statement->base.source_position);
4805         ir_node  *switch_node = NULL;
4806
4807         if (currently_reachable()) {
4808                 ir_node *expression = expression_to_firm(statement->expression);
4809                 ir_switch_table *table = create_switch_table(statement);
4810                 unsigned n_outs = (unsigned)ir_switch_table_get_n_entries(table) + 1;
4811
4812                 switch_node = new_d_Switch(dbgi, expression, n_outs, table);
4813         }
4814
4815         set_unreachable_now();
4816
4817         ir_node *const old_switch            = current_switch;
4818         ir_node *const old_break_label       = break_label;
4819         const bool     old_saw_default_label = saw_default_label;
4820         saw_default_label                    = false;
4821         current_switch                       = switch_node;
4822         break_label                          = NULL;
4823
4824         statement_to_firm(statement->body);
4825
4826         if (currently_reachable()) {
4827                 add_immBlock_pred(get_break_label(), new_Jmp());
4828         }
4829
4830         if (!saw_default_label && switch_node) {
4831                 ir_node *proj = new_d_Proj(dbgi, switch_node, mode_X, pn_Switch_default);
4832                 add_immBlock_pred(get_break_label(), proj);
4833         }
4834
4835         if (break_label != NULL) {
4836                 mature_immBlock(break_label);
4837         }
4838         set_cur_block(break_label);
4839
4840         assert(current_switch == switch_node);
4841         current_switch    = old_switch;
4842         break_label       = old_break_label;
4843         saw_default_label = old_saw_default_label;
4844         return NULL;
4845 }
4846
4847 static ir_node *case_label_to_firm(const case_label_statement_t *statement)
4848 {
4849         if (statement->is_empty_range)
4850                 return NULL;
4851
4852         if (current_switch != NULL) {
4853                 ir_node *block = new_immBlock();
4854                 /* Fallthrough from previous case */
4855                 jump_if_reachable(block);
4856
4857                 ir_node  *const proj = new_Proj(current_switch, mode_X, statement->pn);
4858                 add_immBlock_pred(block, proj);
4859                 if (statement->expression == NULL)
4860                         saw_default_label = true;
4861
4862                 mature_immBlock(block);
4863                 set_cur_block(block);
4864         }
4865
4866         return statement_to_firm(statement->statement);
4867 }
4868
4869 static ir_node *label_to_firm(const label_statement_t *statement)
4870 {
4871         ir_node *block = get_label_block(statement->label);
4872         jump_to(block);
4873
4874         set_cur_block(block);
4875         keep_alive(block);
4876         keep_all_memory(block);
4877
4878         return statement_to_firm(statement->statement);
4879 }
4880
4881 static ir_node *computed_goto_to_firm(computed_goto_statement_t const *const statement)
4882 {
4883         if (!currently_reachable())
4884                 return NULL;
4885
4886         ir_node  *const irn  = expression_to_firm(statement->expression);
4887         dbg_info *const dbgi = get_dbg_info(&statement->base.source_position);
4888         ir_node  *const ijmp = new_d_IJmp(dbgi, irn);
4889
4890         set_irn_link(ijmp, ijmp_list);
4891         ijmp_list = ijmp;
4892
4893         set_unreachable_now();
4894         return NULL;
4895 }
4896
4897 static ir_node *asm_statement_to_firm(const asm_statement_t *statement)
4898 {
4899         bool needs_memory = false;
4900
4901         if (statement->is_volatile) {
4902                 needs_memory = true;
4903         }
4904
4905         size_t         n_clobbers = 0;
4906         asm_clobber_t *clobber    = statement->clobbers;
4907         for ( ; clobber != NULL; clobber = clobber->next) {
4908                 const char *clobber_str = clobber->clobber.begin;
4909
4910                 if (!be_is_valid_clobber(clobber_str)) {
4911                         errorf(&statement->base.source_position,
4912                                    "invalid clobber '%s' specified", clobber->clobber);
4913                         continue;
4914                 }
4915
4916                 if (streq(clobber_str, "memory")) {
4917                         needs_memory = true;
4918                         continue;
4919                 }
4920
4921                 ident *id = new_id_from_str(clobber_str);
4922                 obstack_ptr_grow(&asm_obst, id);
4923                 ++n_clobbers;
4924         }
4925         assert(obstack_object_size(&asm_obst) == n_clobbers * sizeof(ident*));
4926         ident **clobbers = NULL;
4927         if (n_clobbers > 0) {
4928                 clobbers = obstack_finish(&asm_obst);
4929         }
4930
4931         size_t n_inputs  = 0;
4932         asm_argument_t *argument = statement->inputs;
4933         for ( ; argument != NULL; argument = argument->next)
4934                 n_inputs++;
4935         size_t n_outputs = 0;
4936         argument = statement->outputs;
4937         for ( ; argument != NULL; argument = argument->next)
4938                 n_outputs++;
4939
4940         unsigned next_pos = 0;
4941
4942         ir_node *ins[n_inputs + n_outputs + 1];
4943         size_t   in_size = 0;
4944
4945         ir_asm_constraint tmp_in_constraints[n_outputs];
4946
4947         const expression_t *out_exprs[n_outputs];
4948         ir_node            *out_addrs[n_outputs];
4949         size_t              out_size = 0;
4950
4951         argument = statement->outputs;
4952         for ( ; argument != NULL; argument = argument->next) {
4953                 const char *constraints = argument->constraints.begin;
4954                 asm_constraint_flags_t asm_flags
4955                         = be_parse_asm_constraints(constraints);
4956
4957                 {
4958                         source_position_t const *const pos = &statement->base.source_position;
4959                         if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
4960                                 warningf(WARN_OTHER, pos, "some constraints in '%s' are not supported", constraints);
4961                         }
4962                         if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
4963                                 errorf(pos, "some constraints in '%s' are invalid", constraints);
4964                                 continue;
4965                         }
4966                         if (! (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE)) {
4967                                 errorf(pos, "no write flag specified for output constraints '%s'", constraints);
4968                                 continue;
4969                         }
4970                 }
4971
4972                 unsigned pos = next_pos++;
4973                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
4974                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
4975                         expression_t *expr = argument->expression;
4976                         ir_node      *addr = expression_to_addr(expr);
4977                         /* in+output, construct an artifical same_as constraint on the
4978                          * input */
4979                         if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_READ) {
4980                                 char     buf[64];
4981                                 ir_node *value = get_value_from_lvalue(expr, addr);
4982
4983                                 snprintf(buf, sizeof(buf), "%u", (unsigned) out_size);
4984
4985                                 ir_asm_constraint constraint;
4986                                 constraint.pos              = pos;
4987                                 constraint.constraint       = new_id_from_str(buf);
4988                                 constraint.mode             = get_ir_mode_storage(expr->base.type);
4989                                 tmp_in_constraints[in_size] = constraint;
4990                                 ins[in_size] = value;
4991
4992                                 ++in_size;
4993                         }
4994
4995                         out_exprs[out_size] = expr;
4996                         out_addrs[out_size] = addr;
4997                         ++out_size;
4998                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
4999                         /* pure memory ops need no input (but we have to make sure we
5000                          * attach to the memory) */
5001                         assert(! (asm_flags &
5002                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
5003                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
5004                         needs_memory = true;
5005
5006                         /* we need to attach the address to the inputs */
5007                         expression_t *expr = argument->expression;
5008
5009                         ir_asm_constraint constraint;
5010                         constraint.pos              = pos;
5011                         constraint.constraint       = new_id_from_str(constraints);
5012                         constraint.mode             = mode_M;
5013                         tmp_in_constraints[in_size] = constraint;
5014
5015                         ins[in_size]          = expression_to_addr(expr);
5016                         ++in_size;
5017                         continue;
5018                 } else {
5019                         errorf(&statement->base.source_position,
5020                                "only modifiers but no place set in constraints '%s'",
5021                                constraints);
5022                         continue;
5023                 }
5024
5025                 ir_asm_constraint constraint;
5026                 constraint.pos        = pos;
5027                 constraint.constraint = new_id_from_str(constraints);
5028                 constraint.mode       = get_ir_mode_storage(argument->expression->base.type);
5029
5030                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5031         }
5032         assert(obstack_object_size(&asm_obst)
5033                         == out_size * sizeof(ir_asm_constraint));
5034         ir_asm_constraint *output_constraints = obstack_finish(&asm_obst);
5035
5036
5037         obstack_grow(&asm_obst, tmp_in_constraints,
5038                      in_size * sizeof(tmp_in_constraints[0]));
5039         /* find and count input and output arguments */
5040         argument = statement->inputs;
5041         for ( ; argument != NULL; argument = argument->next) {
5042                 const char *constraints = argument->constraints.begin;
5043                 asm_constraint_flags_t asm_flags
5044                         = be_parse_asm_constraints(constraints);
5045
5046                 if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
5047                         errorf(&statement->base.source_position,
5048                                "some constraints in '%s' are not supported", constraints);
5049                         continue;
5050                 }
5051                 if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
5052                         errorf(&statement->base.source_position,
5053                                "some constraints in '%s' are invalid", constraints);
5054                         continue;
5055                 }
5056                 if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE) {
5057                         errorf(&statement->base.source_position,
5058                                "write flag specified for input constraints '%s'",
5059                                constraints);
5060                         continue;
5061                 }
5062
5063                 ir_node *input;
5064                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
5065                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
5066                         /* we can treat this as "normal" input */
5067                         input = expression_to_firm(argument->expression);
5068                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
5069                         /* pure memory ops need no input (but we have to make sure we
5070                          * attach to the memory) */
5071                         assert(! (asm_flags &
5072                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
5073                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
5074                         needs_memory = true;
5075                         input = expression_to_addr(argument->expression);
5076                 } else {
5077                         errorf(&statement->base.source_position,
5078                                "only modifiers but no place set in constraints '%s'",
5079                                constraints);
5080                         continue;
5081                 }
5082
5083                 ir_asm_constraint constraint;
5084                 constraint.pos        = next_pos++;
5085                 constraint.constraint = new_id_from_str(constraints);
5086                 constraint.mode       = get_irn_mode(input);
5087
5088                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5089                 ins[in_size++] = input;
5090         }
5091
5092         if (needs_memory) {
5093                 ir_asm_constraint constraint;
5094                 constraint.pos        = next_pos++;
5095                 constraint.constraint = new_id_from_str("");
5096                 constraint.mode       = mode_M;
5097
5098                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5099                 ins[in_size++] = get_store();
5100         }
5101
5102         assert(obstack_object_size(&asm_obst)
5103                         == in_size * sizeof(ir_asm_constraint));
5104         ir_asm_constraint *input_constraints = obstack_finish(&asm_obst);
5105
5106         /* create asm node */
5107         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
5108
5109         ident *asm_text = new_id_from_str(statement->asm_text.begin);
5110
5111         ir_node *node = new_d_ASM(dbgi, in_size, ins, input_constraints,
5112                                   out_size, output_constraints,
5113                                   n_clobbers, clobbers, asm_text);
5114
5115         if (statement->is_volatile) {
5116                 set_irn_pinned(node, op_pin_state_pinned);
5117         } else {
5118                 set_irn_pinned(node, op_pin_state_floats);
5119         }
5120
5121         /* create output projs & connect them */
5122         if (needs_memory) {
5123                 ir_node *projm = new_Proj(node, mode_M, out_size);
5124                 set_store(projm);
5125         }
5126
5127         size_t i;
5128         for (i = 0; i < out_size; ++i) {
5129                 const expression_t *out_expr = out_exprs[i];
5130                 long                pn       = i;
5131                 ir_mode            *mode     = get_ir_mode_storage(out_expr->base.type);
5132                 ir_node            *proj     = new_Proj(node, mode, pn);
5133                 ir_node            *addr     = out_addrs[i];
5134
5135                 set_value_for_expression_addr(out_expr, proj, addr);
5136         }
5137
5138         return NULL;
5139 }
5140
5141 static ir_node *ms_try_statement_to_firm(ms_try_statement_t *statement)
5142 {
5143         statement_to_firm(statement->try_statement);
5144         source_position_t const *const pos = &statement->base.source_position;
5145         warningf(WARN_OTHER, pos, "structured exception handling ignored");
5146         return NULL;
5147 }
5148
5149 static ir_node *leave_statement_to_firm(leave_statement_t *statement)
5150 {
5151         errorf(&statement->base.source_position, "__leave not supported yet");
5152         return NULL;
5153 }
5154
5155 /**
5156  * Transform a statement.
5157  */
5158 static ir_node *statement_to_firm(statement_t *const stmt)
5159 {
5160 #ifndef NDEBUG
5161         assert(!stmt->base.transformed);
5162         stmt->base.transformed = true;
5163 #endif
5164
5165         switch (stmt->kind) {
5166         case STATEMENT_ASM:           return asm_statement_to_firm(        &stmt->asms);
5167         case STATEMENT_CASE_LABEL:    return case_label_to_firm(           &stmt->case_label);
5168         case STATEMENT_COMPOUND:      return compound_statement_to_firm(   &stmt->compound);
5169         case STATEMENT_COMPUTED_GOTO: return computed_goto_to_firm(        &stmt->computed_goto);
5170         case STATEMENT_DECLARATION:   return declaration_statement_to_firm(&stmt->declaration);
5171         case STATEMENT_DO_WHILE:      return do_while_statement_to_firm(   &stmt->do_while);
5172         case STATEMENT_EMPTY:         return NULL; /* nothing */
5173         case STATEMENT_EXPRESSION:    return expression_statement_to_firm( &stmt->expression);
5174         case STATEMENT_FOR:           return for_statement_to_firm(        &stmt->fors);
5175         case STATEMENT_IF:            return if_statement_to_firm(         &stmt->ifs);
5176         case STATEMENT_LABEL:         return label_to_firm(                &stmt->label);
5177         case STATEMENT_LEAVE:         return leave_statement_to_firm(      &stmt->leave);
5178         case STATEMENT_MS_TRY:        return ms_try_statement_to_firm(     &stmt->ms_try);
5179         case STATEMENT_RETURN:        return return_statement_to_firm(     &stmt->returns);
5180         case STATEMENT_SWITCH:        return switch_statement_to_firm(     &stmt->switchs);
5181         case STATEMENT_WHILE:         return while_statement_to_firm(      &stmt->whiles);
5182
5183         case STATEMENT_BREAK:         return create_jump_statement(stmt, get_break_label());
5184         case STATEMENT_CONTINUE:      return create_jump_statement(stmt, continue_label);
5185         case STATEMENT_GOTO:          return create_jump_statement(stmt, get_label_block(stmt->gotos.label));
5186
5187         case STATEMENT_ERROR: panic("error statement found");
5188         }
5189         panic("statement not implemented");
5190 }
5191
5192 static int count_local_variables(const entity_t *entity,
5193                                  const entity_t *const last)
5194 {
5195         int count = 0;
5196         entity_t const *const end = last != NULL ? last->base.next : NULL;
5197         for (; entity != end; entity = entity->base.next) {
5198                 if ((entity->kind == ENTITY_VARIABLE || entity->kind == ENTITY_PARAMETER) &&
5199                     !entity->variable.address_taken                                       &&
5200                     is_type_scalar(skip_typeref(entity->declaration.type)))
5201                         ++count;
5202         }
5203         return count;
5204 }
5205
5206 static void count_local_variables_in_stmt(statement_t *stmt, void *const env)
5207 {
5208         int *const count = env;
5209
5210         switch (stmt->kind) {
5211         case STATEMENT_DECLARATION: {
5212                 const declaration_statement_t *const decl_stmt = &stmt->declaration;
5213                 *count += count_local_variables(decl_stmt->declarations_begin,
5214                                 decl_stmt->declarations_end);
5215                 break;
5216         }
5217
5218         case STATEMENT_FOR:
5219                 *count += count_local_variables(stmt->fors.scope.entities, NULL);
5220                 break;
5221
5222         default:
5223                 break;
5224         }
5225 }
5226
5227 /**
5228  * Return the number of local (alias free) variables used by a function.
5229  */
5230 static int get_function_n_local_vars(entity_t *entity)
5231 {
5232         const function_t *function = &entity->function;
5233         int count = 0;
5234
5235         /* count parameters */
5236         count += count_local_variables(function->parameters.entities, NULL);
5237
5238         /* count local variables declared in body */
5239         walk_statements(function->statement, count_local_variables_in_stmt, &count);
5240         return count;
5241 }
5242
5243 /**
5244  * Build Firm code for the parameters of a function.
5245  */
5246 static void initialize_function_parameters(entity_t *entity)
5247 {
5248         assert(entity->kind == ENTITY_FUNCTION);
5249         ir_graph *irg             = current_ir_graph;
5250         ir_node  *args            = get_irg_args(irg);
5251         int       n               = 0;
5252         ir_type  *function_irtype;
5253
5254         if (entity->function.need_closure) {
5255                 /* add an extra parameter for the static link */
5256                 entity->function.static_link = new_r_Proj(args, mode_P_data, 0);
5257                 ++n;
5258
5259                 /* Matze: IMO this is wrong, nested functions should have an own
5260                  * type and not rely on strange parameters... */
5261                 function_irtype = create_method_type(&entity->declaration.type->function, true);
5262         } else {
5263                 function_irtype = get_ir_type(entity->declaration.type);
5264         }
5265
5266
5267
5268         entity_t *parameter = entity->function.parameters.entities;
5269         for ( ; parameter != NULL; parameter = parameter->base.next, ++n) {
5270                 if (parameter->kind != ENTITY_PARAMETER)
5271                         continue;
5272
5273                 assert(parameter->declaration.kind == DECLARATION_KIND_UNKNOWN);
5274                 type_t *type = skip_typeref(parameter->declaration.type);
5275
5276                 assert(!is_type_array(type));
5277                 bool const needs_entity = parameter->variable.address_taken || is_type_compound(type);
5278
5279                 ir_type *param_irtype = get_method_param_type(function_irtype, n);
5280                 if (needs_entity) {
5281                         ir_type   *frame_type = get_irg_frame_type(irg);
5282                         ir_entity *param
5283                                 = new_parameter_entity(frame_type, n, param_irtype);
5284                         parameter->declaration.kind  = DECLARATION_KIND_PARAMETER_ENTITY;
5285                         parameter->variable.v.entity = param;
5286                         continue;
5287                 }
5288
5289                 ir_mode *param_mode = get_type_mode(param_irtype);
5290                 long     pn         = n;
5291                 ir_node *value      = new_r_Proj(args, param_mode, pn);
5292
5293                 ir_mode *mode = get_ir_mode_storage(type);
5294                 value = create_conv(NULL, value, mode);
5295                 value = do_strict_conv(NULL, value);
5296
5297                 parameter->declaration.kind        = DECLARATION_KIND_PARAMETER;
5298                 parameter->variable.v.value_number = next_value_number_function;
5299                 set_irg_loc_description(current_ir_graph, next_value_number_function,
5300                                         parameter);
5301                 ++next_value_number_function;
5302
5303                 set_value(parameter->variable.v.value_number, value);
5304         }
5305 }
5306
5307 /**
5308  * Handle additional decl modifiers for IR-graphs
5309  *
5310  * @param irg            the IR-graph
5311  * @param dec_modifiers  additional modifiers
5312  */
5313 static void handle_decl_modifier_irg(ir_graph *irg,
5314                                      decl_modifiers_t decl_modifiers)
5315 {
5316         if (decl_modifiers & DM_NAKED) {
5317                 /* TRUE if the declaration includes the Microsoft
5318                    __declspec(naked) specifier. */
5319                 add_irg_additional_properties(irg, mtp_property_naked);
5320         }
5321         if (decl_modifiers & DM_FORCEINLINE) {
5322                 /* TRUE if the declaration includes the
5323                    Microsoft __forceinline specifier. */
5324                 set_irg_inline_property(irg, irg_inline_forced);
5325         }
5326         if (decl_modifiers & DM_NOINLINE) {
5327                 /* TRUE if the declaration includes the Microsoft
5328                    __declspec(noinline) specifier. */
5329                 set_irg_inline_property(irg, irg_inline_forbidden);
5330         }
5331 }
5332
5333 static void add_function_pointer(ir_type *segment, ir_entity *method,
5334                                  const char *unique_template)
5335 {
5336         ir_type   *method_type  = get_entity_type(method);
5337         ir_type   *ptr_type     = new_type_pointer(method_type);
5338
5339         /* these entities don't really have a name but firm only allows
5340          * "" in ld_ident.
5341          * Note that we mustn't give these entities a name since for example
5342          * Mach-O doesn't allow them. */
5343         ident     *ide          = id_unique(unique_template);
5344         ir_entity *ptr          = new_entity(segment, ide, ptr_type);
5345         ir_graph  *irg          = get_const_code_irg();
5346         ir_node   *val          = new_rd_SymConst_addr_ent(NULL, irg, mode_P_code,
5347                                                            method);
5348
5349         set_entity_ld_ident(ptr, new_id_from_chars("", 0));
5350         set_entity_compiler_generated(ptr, 1);
5351         set_entity_visibility(ptr, ir_visibility_private);
5352         add_entity_linkage(ptr, IR_LINKAGE_CONSTANT|IR_LINKAGE_HIDDEN_USER);
5353         set_atomic_ent_value(ptr, val);
5354 }
5355
5356 /**
5357  * Generate possible IJmp branches to a given label block.
5358  */
5359 static void gen_ijmp_branches(ir_node *block)
5360 {
5361         ir_node *ijmp;
5362         for (ijmp = ijmp_list; ijmp != NULL; ijmp = get_irn_link(ijmp)) {
5363                 add_immBlock_pred(block, ijmp);
5364         }
5365 }
5366
5367 /**
5368  * Create code for a function and all inner functions.
5369  *
5370  * @param entity  the function entity
5371  */
5372 static void create_function(entity_t *entity)
5373 {
5374         assert(entity->kind == ENTITY_FUNCTION);
5375         ir_entity *function_entity = get_function_entity(entity, current_outer_frame);
5376
5377         if (entity->function.statement == NULL)
5378                 return;
5379
5380         inner_functions     = NULL;
5381         current_trampolines = NULL;
5382
5383         if (entity->declaration.modifiers & DM_CONSTRUCTOR) {
5384                 ir_type *segment = get_segment_type(IR_SEGMENT_CONSTRUCTORS);
5385                 add_function_pointer(segment, function_entity, "constructor_ptr.%u");
5386         }
5387         if (entity->declaration.modifiers & DM_DESTRUCTOR) {
5388                 ir_type *segment = get_segment_type(IR_SEGMENT_DESTRUCTORS);
5389                 add_function_pointer(segment, function_entity, "destructor_ptr.%u");
5390         }
5391
5392         current_function_entity = entity;
5393         current_function_name   = NULL;
5394         current_funcsig         = NULL;
5395
5396         assert(all_labels == NULL);
5397         all_labels = NEW_ARR_F(label_t *, 0);
5398         ijmp_list  = NULL;
5399
5400         int       n_local_vars = get_function_n_local_vars(entity);
5401         ir_graph *irg          = new_ir_graph(function_entity, n_local_vars);
5402         current_ir_graph = irg;
5403
5404         ir_graph *old_current_function = current_function;
5405         current_function = irg;
5406
5407         ir_entity *const old_current_vararg_entity = current_vararg_entity;
5408         current_vararg_entity = NULL;
5409
5410         set_irg_fp_model(irg, firm_fp_model);
5411         tarval_enable_fp_ops(1);
5412         set_irn_dbg_info(get_irg_start_block(irg),
5413                          get_entity_dbg_info(function_entity));
5414
5415         /* set inline flags */
5416         if (entity->function.is_inline)
5417                 set_irg_inline_property(irg, irg_inline_recomended);
5418         handle_decl_modifier_irg(irg, entity->declaration.modifiers);
5419
5420         next_value_number_function = 0;
5421         initialize_function_parameters(entity);
5422         current_static_link = entity->function.static_link;
5423
5424         statement_to_firm(entity->function.statement);
5425
5426         ir_node *end_block = get_irg_end_block(irg);
5427
5428         /* do we have a return statement yet? */
5429         if (currently_reachable()) {
5430                 type_t *type = skip_typeref(entity->declaration.type);
5431                 assert(is_type_function(type));
5432                 type_t *const return_type = skip_typeref(type->function.return_type);
5433
5434                 ir_node *ret;
5435                 if (is_type_void(return_type)) {
5436                         ret = new_Return(get_store(), 0, NULL);
5437                 } else {
5438                         ir_mode *const mode = get_ir_mode_storage(return_type);
5439
5440                         ir_node *in[1];
5441                         /* §5.1.2.2.3 main implicitly returns 0 */
5442                         if (is_main(entity)) {
5443                                 in[0] = new_Const(get_mode_null(mode));
5444                         } else {
5445                                 in[0] = new_Unknown(mode);
5446                         }
5447                         ret = new_Return(get_store(), 1, in);
5448                 }
5449                 add_immBlock_pred(end_block, ret);
5450         }
5451
5452         for (int i = ARR_LEN(all_labels) - 1; i >= 0; --i) {
5453                 label_t *label = all_labels[i];
5454                 if (label->address_taken) {
5455                         gen_ijmp_branches(label->block);
5456                 }
5457                 mature_immBlock(label->block);
5458         }
5459
5460         DEL_ARR_F(all_labels);
5461         all_labels = NULL;
5462
5463         irg_finalize_cons(irg);
5464
5465         /* finalize the frame type */
5466         ir_type *frame_type = get_irg_frame_type(irg);
5467         int      n          = get_compound_n_members(frame_type);
5468         int      align_all  = 4;
5469         int      offset     = 0;
5470         for (int i = 0; i < n; ++i) {
5471                 ir_entity *member      = get_compound_member(frame_type, i);
5472                 ir_type   *entity_type = get_entity_type(member);
5473
5474                 int align = get_type_alignment_bytes(entity_type);
5475                 if (align > align_all)
5476                         align_all = align;
5477                 int misalign = 0;
5478                 if (align > 0) {
5479                         misalign  = offset % align;
5480                         if (misalign > 0) {
5481                                 offset += align - misalign;
5482                         }
5483                 }
5484
5485                 set_entity_offset(member, offset);
5486                 offset += get_type_size_bytes(entity_type);
5487         }
5488         set_type_size_bytes(frame_type, offset);
5489         set_type_alignment_bytes(frame_type, align_all);
5490
5491         irg_verify(irg, VERIFY_ENFORCE_SSA);
5492         current_vararg_entity = old_current_vararg_entity;
5493         current_function      = old_current_function;
5494
5495         if (current_trampolines != NULL) {
5496                 DEL_ARR_F(current_trampolines);
5497                 current_trampolines = NULL;
5498         }
5499
5500         /* create inner functions if any */
5501         entity_t **inner = inner_functions;
5502         if (inner != NULL) {
5503                 ir_type *rem_outer_frame      = current_outer_frame;
5504                 current_outer_frame           = get_irg_frame_type(current_ir_graph);
5505                 for (int i = ARR_LEN(inner) - 1; i >= 0; --i) {
5506                         create_function(inner[i]);
5507                 }
5508                 DEL_ARR_F(inner);
5509
5510                 current_outer_frame      = rem_outer_frame;
5511         }
5512 }
5513
5514 static void scope_to_firm(scope_t *scope)
5515 {
5516         /* first pass: create declarations */
5517         entity_t *entity = scope->entities;
5518         for ( ; entity != NULL; entity = entity->base.next) {
5519                 if (entity->base.symbol == NULL)
5520                         continue;
5521
5522                 if (entity->kind == ENTITY_FUNCTION) {
5523                         if (entity->function.btk != BUILTIN_NONE) {
5524                                 /* builtins have no representation */
5525                                 continue;
5526                         }
5527                         (void)get_function_entity(entity, NULL);
5528                 } else if (entity->kind == ENTITY_VARIABLE) {
5529                         create_global_variable(entity);
5530                 } else if (entity->kind == ENTITY_NAMESPACE) {
5531                         scope_to_firm(&entity->namespacee.members);
5532                 }
5533         }
5534
5535         /* second pass: create code/initializers */
5536         entity = scope->entities;
5537         for ( ; entity != NULL; entity = entity->base.next) {
5538                 if (entity->base.symbol == NULL)
5539                         continue;
5540
5541                 if (entity->kind == ENTITY_FUNCTION) {
5542                         if (entity->function.btk != BUILTIN_NONE) {
5543                                 /* builtins have no representation */
5544                                 continue;
5545                         }
5546                         create_function(entity);
5547                 } else if (entity->kind == ENTITY_VARIABLE) {
5548                         assert(entity->declaration.kind
5549                                         == DECLARATION_KIND_GLOBAL_VARIABLE);
5550                         current_ir_graph = get_const_code_irg();
5551                         create_variable_initializer(entity);
5552                 }
5553         }
5554 }
5555
5556 void init_ast2firm(void)
5557 {
5558         obstack_init(&asm_obst);
5559         init_atomic_modes();
5560
5561         ir_set_debug_retrieve(dbg_retrieve);
5562         ir_set_type_debug_retrieve(dbg_print_type_dbg_info);
5563
5564         /* create idents for all known runtime functions */
5565         for (size_t i = 0; i < lengthof(rts_data); ++i) {
5566                 rts_idents[i] = new_id_from_str(rts_data[i].name);
5567         }
5568
5569         entitymap_init(&entitymap);
5570 }
5571
5572 static void init_ir_types(void)
5573 {
5574         static int ir_types_initialized = 0;
5575         if (ir_types_initialized)
5576                 return;
5577         ir_types_initialized = 1;
5578
5579         ir_type_char    = get_ir_type(type_char);
5580         ir_type_wchar_t = get_ir_type(type_wchar_t);
5581
5582         be_params             = be_get_backend_param();
5583         mode_float_arithmetic = be_params->mode_float_arithmetic;
5584
5585         stack_param_align     = be_params->stack_param_align;
5586 }
5587
5588 void exit_ast2firm(void)
5589 {
5590         entitymap_destroy(&entitymap);
5591         obstack_free(&asm_obst, NULL);
5592 }
5593
5594 static void global_asm_to_firm(statement_t *s)
5595 {
5596         for (; s != NULL; s = s->base.next) {
5597                 assert(s->kind == STATEMENT_ASM);
5598
5599                 char const *const text = s->asms.asm_text.begin;
5600                 size_t      const size = s->asms.asm_text.size;
5601                 ident      *const id   = new_id_from_chars(text, size);
5602                 add_irp_asm(id);
5603         }
5604 }
5605
5606 static const char *get_cwd(void)
5607 {
5608         static char buf[1024];
5609         if (buf[0] == '\0')
5610                 getcwd(buf, sizeof(buf));
5611         return buf;
5612 }
5613
5614 void translation_unit_to_firm(translation_unit_t *unit)
5615 {
5616         if (c_mode & _CXX) {
5617                 be_dwarf_set_source_language(DW_LANG_C_plus_plus);
5618         } else if (c_mode & _C99) {
5619                 be_dwarf_set_source_language(DW_LANG_C99);
5620         } else if (c_mode & _C89) {
5621                 be_dwarf_set_source_language(DW_LANG_C89);
5622         } else {
5623                 be_dwarf_set_source_language(DW_LANG_C);
5624         }
5625         be_dwarf_set_compilation_directory(get_cwd());
5626
5627         /* initialize firm arithmetic */
5628         tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
5629         ir_set_uninitialized_local_variable_func(uninitialized_local_var);
5630
5631         /* just to be sure */
5632         continue_label           = NULL;
5633         break_label              = NULL;
5634         current_switch           = NULL;
5635         current_translation_unit = unit;
5636
5637         init_ir_types();
5638
5639         scope_to_firm(&unit->scope);
5640         global_asm_to_firm(unit->global_asm);
5641
5642         current_ir_graph         = NULL;
5643         current_translation_unit = NULL;
5644 }