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                 if (size == 4) {
 194                         return get_modeF();
 195                 } else if (size == 8) {
 196                         return get_modeD();
 197                 } else {
 198                         panic("unexpected kind");
 199                 }
 200         } else if (flags & ATOMIC_TYPE_FLAG_INTEGER) {
 201                 char            name[64];
 202                 unsigned        bit_size     = size * 8;
 203                 bool            is_signed    = (flags & ATOMIC_TYPE_FLAG_SIGNED) != 0;
 204                 unsigned        modulo_shift = decide_modulo_shift(bit_size);
 205
 206                 snprintf(name, sizeof(name), "%s%u", is_signed ? "I" : "U", bit_size);
 207                 return new_int_mode(name, irma_twos_complement, bit_size, is_signed,
 208                                     modulo_shift);
 209         }
 210
 211         return NULL;
 212 }
 213
 214 /**
 215  * Initialises the atomic modes depending on the machine size.
 216  */
 217 static void init_atomic_modes(void)
 218 {
 219         atomic_modes[ATOMIC_TYPE_VOID] = mode_ANY;
 220         for (int i = 0; i <= ATOMIC_TYPE_LAST; ++i) {
 221                 if (atomic_modes[i] != NULL)
 222                         continue;
 223                 atomic_modes[i] = init_atomic_ir_mode((atomic_type_kind_t) i);
 224         }
 225 }
 226
 227 ir_mode *get_atomic_mode(atomic_type_kind_t kind)
 228 {
 229         assert(kind <= ATOMIC_TYPE_LAST);
 230         return atomic_modes[kind];
 231 }
 232
 233 static ir_node *get_vla_size(array_type_t *const type)
 234 {
 235         ir_node *size_node = type->size_node;
 236         if (size_node == NULL) {
 237                 size_node = expression_to_firm(type->size_expression);
 238                 type->size_node = size_node;
 239         }
 240         return size_node;
 241 }
 242
 243 static unsigned count_parameters(const function_type_t *function_type)
 244 {
 245         unsigned count = 0;
 246
 247         function_parameter_t *parameter = function_type->parameters;
 248         for ( ; parameter != NULL; parameter = parameter->next) {
 249                 ++count;
 250         }
 251
 252         return count;
 253 }
 254
 255 /**
 256  * Creates a Firm type for an atomic type
 257  */
 258 static ir_type *create_atomic_type(atomic_type_kind_t akind, const type_t *type)
 259 {
 260         ir_mode        *mode      = atomic_modes[akind];
 261         type_dbg_info  *dbgi      = get_type_dbg_info_(type);
 262         ir_type        *irtype    = new_d_type_primitive(mode, dbgi);
 263         il_alignment_t  alignment = get_atomic_type_alignment(akind);
 264
 265         set_type_size_bytes(irtype, get_atomic_type_size(akind));
 266         set_type_alignment_bytes(irtype, alignment);
 267
 268         return irtype;
 269 }
 270
 271 /**
 272  * Creates a Firm type for a complex type
 273  */
 274 static ir_type *create_complex_type(const atomic_type_t *type)
 275 {
 276         atomic_type_kind_t  kind = type->akind;
 277         ir_mode            *mode = atomic_modes[kind];
 278         ident              *id   = get_mode_ident(mode);
 279
 280         (void) id;
 281
 282         /* FIXME: finish the array */
 283         return NULL;
 284 }
 285
 286 /**
 287  * Creates a Firm type for an imaginary type
 288  */
 289 static ir_type *create_imaginary_type(const atomic_type_t *type)
 290 {
 291         return create_atomic_type(type->akind, (const type_t*)type);
 292 }
 293
 294 /**
 295  * return type of a parameter (and take transparent union gnu extension into
 296  * account)
 297  */
 298 static type_t *get_parameter_type(type_t *orig_type)
 299 {
 300         type_t *type = skip_typeref(orig_type);
 301         if (is_type_union(type)
 302                         && get_type_modifiers(orig_type) & DM_TRANSPARENT_UNION) {
 303                 compound_t *compound = type->compound.compound;
 304                 type                 = compound->members.entities->declaration.type;
 305         }
 306
 307         return type;
 308 }
 309
 310 static ir_type *create_method_type(const function_type_t *function_type, bool for_closure)
 311 {
 312         type_t        *return_type  = skip_typeref(function_type->return_type);
 313
 314         int            n_parameters = count_parameters(function_type)
 315                                        + (for_closure ? 1 : 0);
 316         int            n_results    = is_type_void(return_type) ? 0 : 1;
 317         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) function_type);
 318         ir_type       *irtype       = new_d_type_method(n_parameters, n_results, dbgi);
 319
 320         if (!is_type_void(return_type)) {
 321                 ir_type *restype = get_ir_type(return_type);
 322                 set_method_res_type(irtype, 0, restype);
 323         }
 324
 325         function_parameter_t *parameter = function_type->parameters;
 326         int                   n         = 0;
 327         if (for_closure) {
 328                 ir_type *p_irtype = get_ir_type(type_void_ptr);
 329                 set_method_param_type(irtype, n, p_irtype);
 330                 ++n;
 331         }
 332         for ( ; parameter != NULL; parameter = parameter->next) {
 333                 type_t  *type     = get_parameter_type(parameter->type);
 334                 ir_type *p_irtype = get_ir_type(type);
 335                 set_method_param_type(irtype, n, p_irtype);
 336                 ++n;
 337         }
 338
 339         bool is_variadic = function_type->variadic;
 340
 341         if (is_variadic)
 342                 set_method_variadicity(irtype, variadicity_variadic);
 343
 344         unsigned cc = get_method_calling_convention(irtype);
 345         switch (function_type->calling_convention) {
 346         case CC_DEFAULT: /* unspecified calling convention, equal to one of the other, typically cdecl */
 347         case CC_CDECL:
 348 is_cdecl:
 349                 set_method_calling_convention(irtype, SET_CDECL(cc));
 350                 break;
 351
 352         case CC_STDCALL:
 353                 if (is_variadic)
 354                         goto is_cdecl;
 355
 356                 /* only non-variadic function can use stdcall, else use cdecl */
 357                 set_method_calling_convention(irtype, SET_STDCALL(cc));
 358                 break;
 359
 360         case CC_FASTCALL:
 361                 if (is_variadic)
 362                         goto is_cdecl;
 363                 /* only non-variadic function can use fastcall, else use cdecl */
 364                 set_method_calling_convention(irtype, SET_FASTCALL(cc));
 365                 break;
 366
 367         case CC_THISCALL:
 368                 /* Hmm, leave default, not accepted by the parser yet. */
 369                 break;
 370         }
 371
 372         if (for_closure)
 373                 set_method_calling_convention(irtype, get_method_calling_convention(irtype) | cc_this_call);
 374
 375         const decl_modifiers_t modifiers = function_type->modifiers;
 376         if (modifiers & DM_CONST)
 377                 add_method_additional_properties(irtype, mtp_property_const);
 378         if (modifiers & DM_PURE)
 379                 add_method_additional_properties(irtype, mtp_property_pure);
 380         if (modifiers & DM_RETURNS_TWICE)
 381                 add_method_additional_properties(irtype, mtp_property_returns_twice);
 382         if (modifiers & DM_NORETURN)
 383                 add_method_additional_properties(irtype, mtp_property_noreturn);
 384         if (modifiers & DM_NOTHROW)
 385                 add_method_additional_properties(irtype, mtp_property_nothrow);
 386         if (modifiers & DM_MALLOC)
 387                 add_method_additional_properties(irtype, mtp_property_malloc);
 388
 389         return irtype;
 390 }
 391
 392 static ir_type *create_pointer_type(pointer_type_t *type)
 393 {
 394         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) type);
 395         type_t        *points_to    = type->points_to;
 396         ir_type       *ir_points_to = get_ir_type_incomplete(points_to);
 397         ir_type       *irtype       = new_d_type_pointer(ir_points_to, dbgi);
 398
 399         return irtype;
 400 }
 401
 402 static ir_type *create_reference_type(reference_type_t *type)
 403 {
 404         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) type);
 405         type_t        *refers_to    = type->refers_to;
 406         ir_type       *ir_refers_to = get_ir_type_incomplete(refers_to);
 407         ir_type       *irtype       = new_d_type_pointer(ir_refers_to, dbgi);
 408
 409         return irtype;
 410 }
 411
 412 static ir_type *create_array_type(array_type_t *type)
 413 {
 414         type_dbg_info *dbgi            = get_type_dbg_info_((const type_t*) type);
 415         type_t        *element_type    = type->element_type;
 416         ir_type       *ir_element_type = get_ir_type(element_type);
 417         ir_type       *irtype          = new_d_type_array(1, ir_element_type, dbgi);
 418
 419         const int align = get_type_alignment_bytes(ir_element_type);
 420         set_type_alignment_bytes(irtype, align);
 421
 422         if (type->size_constant) {
 423                 int n_elements = type->size;
 424
 425                 set_array_bounds_int(irtype, 0, 0, n_elements);
 426
 427                 size_t elemsize = get_type_size_bytes(ir_element_type);
 428                 if (elemsize % align > 0) {
 429                         elemsize += align - (elemsize % align);
 430                 }
 431                 set_type_size_bytes(irtype, n_elements * elemsize);
 432         } else {
 433                 set_array_lower_bound_int(irtype, 0, 0);
 434         }
 435         set_type_state(irtype, layout_fixed);
 436
 437         return irtype;
 438 }
 439
 440 /**
 441  * Return the signed integer type of size bits.
 442  *
 443  * @param size   the size
 444  */
 445 static ir_type *get_signed_int_type_for_bit_size(ir_type *base_tp,
 446                                                  unsigned size,
 447                                                                                                  const type_t *type)
 448 {
 449         static ir_mode *s_modes[64 + 1] = {NULL, };
 450         ir_type *res;
 451         ir_mode *mode;
 452
 453         if (size <= 0 || size > 64)
 454                 return NULL;
 455
 456         mode = s_modes[size];
 457         if (mode == NULL) {
 458                 char name[32];
 459
 460                 snprintf(name, sizeof(name), "bf_I%u", size);
 461                 mode = new_int_mode(name, irma_twos_complement, size, 1, 0);
 462                 s_modes[size] = mode;
 463         }
 464
 465         type_dbg_info *dbgi = get_type_dbg_info_(type);
 466         res                 = new_d_type_primitive(mode, dbgi);
 467         set_primitive_base_type(res, base_tp);
 468
 469         return res;
 470 }
 471
 472 /**
 473  * Return the unsigned integer type of size bits.
 474  *
 475  * @param size   the size
 476  */
 477 static ir_type *get_unsigned_int_type_for_bit_size(ir_type *base_tp,
 478                                                    unsigned size,
 479                                                                                                    const type_t *type)
 480 {
 481         static ir_mode *u_modes[64 + 1] = {NULL, };
 482         ir_type *res;
 483         ir_mode *mode;
 484
 485         if (size <= 0 || size > 64)
 486                 return NULL;
 487
 488         mode = u_modes[size];
 489         if (mode == NULL) {
 490                 char name[32];
 491
 492                 snprintf(name, sizeof(name), "bf_U%u", size);
 493                 mode = new_int_mode(name, irma_twos_complement, size, 0, 0);
 494                 u_modes[size] = mode;
 495         }
 496
 497         type_dbg_info *dbgi = get_type_dbg_info_(type);
 498         res = new_d_type_primitive(mode, dbgi);
 499         set_primitive_base_type(res, base_tp);
 500
 501         return res;
 502 }
 503
 504 static ir_type *create_bitfield_type(const entity_t *entity)
 505 {
 506         assert(entity->kind == ENTITY_COMPOUND_MEMBER);
 507         type_t *base = skip_typeref(entity->declaration.type);
 508         assert(base->kind == TYPE_ATOMIC || base->kind == TYPE_ENUM);
 509         ir_type *irbase = get_ir_type(base);
 510
 511         unsigned bit_size = entity->compound_member.bit_size;
 512
 513         assert(!is_type_float(base));
 514         if (is_type_signed(base)) {
 515                 return get_signed_int_type_for_bit_size(irbase, bit_size, base);
 516         } else {
 517                 return get_unsigned_int_type_for_bit_size(irbase, bit_size, base);
 518         }
 519 }
 520
 521 /**
 522  * Construct firm type from ast struct type.
 523  */
 524 static ir_type *create_compound_type(compound_type_t *const type, bool const incomplete)
 525 {
 526         compound_t *compound = type->compound;
 527
 528         if (compound->irtype != NULL && (compound->irtype_complete || incomplete)) {
 529                 return compound->irtype;
 530         }
 531
 532         bool const is_union = type->base.kind == TYPE_COMPOUND_UNION;
 533
 534         symbol_t *type_symbol = compound->base.symbol;
 535         ident    *id;
 536         if (type_symbol != NULL) {
 537                 id = new_id_from_str(type_symbol->string);
 538         } else {
 539                 if (is_union) {
 540                         id = id_unique("__anonymous_union.%u");
 541                 } else {
 542                         id = id_unique("__anonymous_struct.%u");
 543                 }
 544         }
 545
 546         ir_type *irtype;
 547         if (is_union) {
 548                 irtype = new_type_union(id);
 549         } else {
 550                 irtype = new_type_struct(id);
 551         }
 552
 553         compound->irtype_complete = false;
 554         compound->irtype          = irtype;
 555
 556         if (incomplete)
 557                 return irtype;
 558
 559         if (is_union) {
 560                 layout_union_type(type);
 561         } else {
 562                 layout_struct_type(type);
 563         }
 564
 565         compound->irtype_complete = true;
 566
 567         entity_t *entry = compound->members.entities;
 568         for ( ; entry != NULL; entry = entry->base.next) {
 569                 if (entry->kind != ENTITY_COMPOUND_MEMBER)
 570                         continue;
 571
 572                 symbol_t *symbol     = entry->base.symbol;
 573                 type_t   *entry_type = entry->declaration.type;
 574                 ident    *ident;
 575                 if (symbol == NULL) {
 576                         /* anonymous bitfield member, skip */
 577                         if (entry->compound_member.bitfield)
 578                                 continue;
 579                         assert(entry_type->kind == TYPE_COMPOUND_STRUCT
 580                                         || entry_type->kind == TYPE_COMPOUND_UNION);
 581                         ident = id_unique("anon.%u");
 582                 } else {
 583                         ident = new_id_from_str(symbol->string);
 584                 }
 585
 586                 dbg_info *dbgi       = get_dbg_info(&entry->base.source_position);
 587
 588                 ir_type *entry_irtype;
 589                 if (entry->compound_member.bitfield) {
 590                         entry_irtype = create_bitfield_type(entry);
 591                 } else {
 592                         entry_irtype = get_ir_type(entry_type);
 593                 }
 594                 ir_entity *entity = new_d_entity(irtype, ident, entry_irtype, dbgi);
 595
 596                 set_entity_offset(entity, entry->compound_member.offset);
 597                 set_entity_offset_bits_remainder(entity,
 598                                                  entry->compound_member.bit_offset);
 599
 600                 assert(entry->declaration.kind == DECLARATION_KIND_UNKNOWN);
 601                 entry->declaration.kind       = DECLARATION_KIND_COMPOUND_MEMBER;
 602                 entry->compound_member.entity = entity;
 603         }
 604
 605         set_type_alignment_bytes(irtype, compound->alignment);
 606         set_type_size_bytes(irtype, compound->size);
 607         set_type_state(irtype, layout_fixed);
 608
 609         return irtype;
 610 }
 611
 612 static ir_tarval *fold_constant_to_tarval(expression_t const *);
 613
 614 static void determine_enum_values(enum_type_t *const type)
 615 {
 616         ir_mode   *const mode    = atomic_modes[type->base.akind];
 617         ir_tarval *const one     = get_mode_one(mode);
 618         ir_tarval *      tv_next = get_mode_null(mode);
 619
 620         enum_t   *enume = type->enume;
 621         entity_t *entry = enume->base.next;
 622         for (; entry != NULL; entry = entry->base.next) {
 623                 if (entry->kind != ENTITY_ENUM_VALUE)
 624                         break;
 625
 626                 expression_t *const init = entry->enum_value.value;
 627                 if (init != NULL) {
 628                         tv_next = fold_constant_to_tarval(init);
 629                 }
 630                 assert(entry->enum_value.tv == NULL || entry->enum_value.tv == tv_next);
 631                 entry->enum_value.tv = tv_next;
 632                 tv_next = tarval_add(tv_next, one);
 633         }
 634 }
 635
 636 static ir_type *create_enum_type(enum_type_t *const type)
 637 {
 638         return create_atomic_type(type->base.akind, (const type_t*) type);
 639 }
 640
 641 static ir_type *get_ir_type_incomplete(type_t *type)
 642 {
 643         assert(type != NULL);
 644         type = skip_typeref(type);
 645
 646         if (type->base.firm_type != NULL) {
 647                 return type->base.firm_type;
 648         }
 649
 650         if (is_type_compound(type)) {
 651                 return create_compound_type(&type->compound, true);
 652         } else {
 653                 return get_ir_type(type);
 654         }
 655 }
 656
 657 ir_type *get_ir_type(type_t *type)
 658 {
 659         assert(type != NULL);
 660
 661         type = skip_typeref(type);
 662
 663         if (type->base.firm_type != NULL) {
 664                 return type->base.firm_type;
 665         }
 666
 667         ir_type *firm_type = NULL;
 668         switch (type->kind) {
 669         case TYPE_ATOMIC:
 670                 firm_type = create_atomic_type(type->atomic.akind, type);
 671                 break;
 672         case TYPE_COMPLEX:
 673                 firm_type = create_complex_type(&type->atomic);
 674                 break;
 675         case TYPE_IMAGINARY:
 676                 firm_type = create_imaginary_type(&type->atomic);
 677                 break;
 678         case TYPE_FUNCTION:
 679                 firm_type = create_method_type(&type->function, false);
 680                 break;
 681         case TYPE_POINTER:
 682                 firm_type = create_pointer_type(&type->pointer);
 683                 break;
 684         case TYPE_REFERENCE:
 685                 firm_type = create_reference_type(&type->reference);
 686                 break;
 687         case TYPE_ARRAY:
 688                 firm_type = create_array_type(&type->array);
 689                 break;
 690         case TYPE_COMPOUND_STRUCT:
 691         case TYPE_COMPOUND_UNION:
 692                 firm_type = create_compound_type(&type->compound, false);
 693                 break;
 694         case TYPE_ENUM:
 695                 firm_type = create_enum_type(&type->enumt);
 696                 break;
 697
 698         case TYPE_ERROR:
 699         case TYPE_TYPEOF:
 700         case TYPE_TYPEDEF:
 701                 break;
 702         }
 703         if (firm_type == NULL)
 704                 panic("unknown type found");
 705
 706         type->base.firm_type = firm_type;
 707         return firm_type;
 708 }
 709
 710 static ir_mode *get_ir_mode_storage(type_t *type)
 711 {
 712         type = skip_typeref(type);
 713
 714         /* Firm doesn't report a mode for arrays and structs/unions. */
 715         if (!is_type_scalar(type)) {
 716                 return mode_P_data;
 717         }
 718
 719         ir_type *const irtype = get_ir_type(type);
 720         ir_mode *const mode   = get_type_mode(irtype);
 721         assert(mode != NULL);
 722         return mode;
 723 }
 724
 725 /*
 726  * get arithmetic mode for a type. This is different from get_ir_mode_storage,
 727  * int that it returns bigger modes for floating point on some platforms
 728  * (x87 internally does arithemtic with 80bits)
 729  */
 730 static ir_mode *get_ir_mode_arithmetic(type_t *type)
 731 {
 732         ir_mode *mode = get_ir_mode_storage(type);
 733         if (mode_is_float(mode) && mode_float_arithmetic != NULL) {
 734                 return mode_float_arithmetic;
 735         }
 736
 737         return mode;
 738 }
 739
 740 /**
 741  * Return a node representing the size of a type.
 742  */
 743 static ir_node *get_type_size_node(type_t *type)
 744 {
 745         unsigned size;
 746         ir_mode *mode = get_ir_mode_arithmetic(type_size_t);
 747         type = skip_typeref(type);
 748
 749         if (is_type_array(type) && type->array.is_vla) {
 750                 ir_node *size_node = get_vla_size(&type->array);
 751                 ir_node *elem_size = get_type_size_node(type->array.element_type);
 752                 ir_node *real_size = new_d_Mul(NULL, size_node, elem_size, mode);
 753                 return real_size;
 754         }
 755
 756         size = get_type_size(type);
 757         return new_Const_long(mode, size);
 758 }
 759
 760 /** Names of the runtime functions. */
 761 static const struct {
 762         int        id;           /**< the rts id */
 763         int        n_res;        /**< number of return values */
 764         const char *name;        /**< the name of the rts function */
 765         int        n_params;     /**< number of parameters */
 766         unsigned   flags;        /**< language flags */
 767 } rts_data[] = {
 768         { rts_debugbreak, 0, "__debugbreak", 0, _MS },
 769         { rts_abort,      0, "abort",        0, _C89 },
 770         { rts_alloca,     1, "alloca",       1, _ALL },
 771         { rts_abs,        1, "abs",          1, _C89 },
 772         { rts_labs,       1, "labs",         1, _C89 },
 773         { rts_llabs,      1, "llabs",        1, _C99 },
 774         { rts_imaxabs,    1, "imaxabs",      1, _C99 },
 775
 776         { rts_fabs,       1, "fabs",         1, _C89 },
 777         { rts_sqrt,       1, "sqrt",         1, _C89 },
 778         { rts_cbrt,       1, "cbrt",         1, _C99 },
 779         { rts_exp,        1, "exp",          1, _C89 },
 780         { rts_exp2,       1, "exp2",         1, _C89 },
 781         { rts_exp10,      1, "exp10",        1, _GNUC },
 782         { rts_log,        1, "log",          1, _C89 },
 783         { rts_log2,       1, "log2",         1, _C89 },
 784         { rts_log10,      1, "log10",        1, _C89 },
 785         { rts_pow,        1, "pow",          2, _C89 },
 786         { rts_sin,        1, "sin",          1, _C89 },
 787         { rts_cos,        1, "cos",          1, _C89 },
 788         { rts_tan,        1, "tan",          1, _C89 },
 789         { rts_asin,       1, "asin",         1, _C89 },
 790         { rts_acos,       1, "acos",         1, _C89 },
 791         { rts_atan,       1, "atan",         1, _C89 },
 792         { rts_sinh,       1, "sinh",         1, _C89 },
 793         { rts_cosh,       1, "cosh",         1, _C89 },
 794         { rts_tanh,       1, "tanh",         1, _C89 },
 795
 796         { rts_fabsf,      1, "fabsf",        1, _C99 },
 797         { rts_sqrtf,      1, "sqrtf",        1, _C99 },
 798         { rts_cbrtf,      1, "cbrtf",        1, _C99 },
 799         { rts_expf,       1, "expf",         1, _C99 },
 800         { rts_exp2f,      1, "exp2f",        1, _C99 },
 801         { rts_exp10f,     1, "exp10f",       1, _GNUC },
 802         { rts_logf,       1, "logf",         1, _C99 },
 803         { rts_log2f,      1, "log2f",        1, _C99 },
 804         { rts_log10f,     1, "log10f",       1, _C99 },
 805         { rts_powf,       1, "powf",         2, _C99 },
 806         { rts_sinf,       1, "sinf",         1, _C99 },
 807         { rts_cosf,       1, "cosf",         1, _C99 },
 808         { rts_tanf,       1, "tanf",         1, _C99 },
 809         { rts_asinf,      1, "asinf",        1, _C99 },
 810         { rts_acosf,      1, "acosf",        1, _C99 },
 811         { rts_atanf,      1, "atanf",        1, _C99 },
 812         { rts_sinhf,      1, "sinhf",        1, _C99 },
 813         { rts_coshf,      1, "coshf",        1, _C99 },
 814         { rts_tanhf,      1, "tanhf",        1, _C99 },
 815
 816         { rts_fabsl,      1, "fabsl",        1, _C99 },
 817         { rts_sqrtl,      1, "sqrtl",        1, _C99 },
 818         { rts_cbrtl,      1, "cbrtl",        1, _C99 },
 819         { rts_expl,       1, "expl",         1, _C99 },
 820         { rts_exp2l,      1, "exp2l",        1, _C99 },
 821         { rts_exp10l,     1, "exp10l",       1, _GNUC },
 822         { rts_logl,       1, "logl",         1, _C99 },
 823         { rts_log2l,      1, "log2l",        1, _C99 },
 824         { rts_log10l,     1, "log10l",       1, _C99 },
 825         { rts_powl,       1, "powl",         2, _C99 },
 826         { rts_sinl,       1, "sinl",         1, _C99 },
 827         { rts_cosl,       1, "cosl",         1, _C99 },
 828         { rts_tanl,       1, "tanl",         1, _C99 },
 829         { rts_asinl,      1, "asinl",        1, _C99 },
 830         { rts_acosl,      1, "acosl",        1, _C99 },
 831         { rts_atanl,      1, "atanl",        1, _C99 },
 832         { rts_sinhl,      1, "sinhl",        1, _C99 },
 833         { rts_coshl,      1, "coshl",        1, _C99 },
 834         { rts_tanhl,      1, "tanhl",        1, _C99 },
 835
 836         { rts_strcmp,     1, "strcmp",       2, _C89 },
 837         { rts_strncmp,    1, "strncmp",      3, _C89 },
 838         { rts_strcpy,     1, "strcpy",       2, _C89 },
 839         { rts_strlen,     1, "strlen",       1, _C89 },
 840         { rts_memcpy,     1, "memcpy",       3, _C89 },
 841         { rts_mempcpy,    1, "mempcpy",      3, _GNUC },
 842         { rts_memmove,    1, "memmove",      3, _C89 },
 843         { rts_memset,     1, "memset",       3, _C89 },
 844         { rts_memcmp,     1, "memcmp",       3, _C89 },
 845 };
 846
 847 static ident *rts_idents[lengthof(rts_data)];
 848
 849 static create_ld_ident_func create_ld_ident = create_name_linux_elf;
 850
 851 void set_create_ld_ident(ident *(*func)(entity_t*))
 852 {
 853         create_ld_ident = func;
 854 }
 855
 856 static bool declaration_is_definition(const entity_t *entity)
 857 {
 858         switch (entity->kind) {
 859         case ENTITY_VARIABLE:
 860                 return entity->declaration.storage_class != STORAGE_CLASS_EXTERN;
 861         case ENTITY_FUNCTION:
 862                 return entity->function.statement != NULL;
 863         case ENTITY_PARAMETER:
 864         case ENTITY_COMPOUND_MEMBER:
 865                 return false;
 866         case ENTITY_TYPEDEF:
 867         case ENTITY_ENUM:
 868         case ENTITY_ENUM_VALUE:
 869         case ENTITY_NAMESPACE:
 870         case ENTITY_LABEL:
 871         case ENTITY_LOCAL_LABEL:
 872                 break;
 873         }
 874         panic("declaration_is_definition called on non-declaration");
 875 }
 876
 877 /**
 878  * Handle GNU attributes for entities
 879  *
 880  * @param ent   the entity
 881  * @param decl  the routine declaration
 882  */
 883 static void handle_decl_modifiers(ir_entity *irentity, entity_t *entity)
 884 {
 885         assert(is_declaration(entity));
 886         decl_modifiers_t modifiers = entity->declaration.modifiers;
 887
 888         if (is_method_entity(irentity)) {
 889                 if (modifiers & DM_PURE) {
 890                         set_entity_additional_properties(irentity, mtp_property_pure);
 891                 }
 892                 if (modifiers & DM_CONST) {
 893                         add_entity_additional_properties(irentity, mtp_property_const);
 894                 }
 895         }
 896         if ((modifiers & DM_USED) && declaration_is_definition(entity)) {
 897                 add_entity_linkage(irentity, IR_LINKAGE_HIDDEN_USER);
 898         }
 899         if ((modifiers & DM_WEAK) && declaration_is_definition(entity)
 900             && entity->declaration.storage_class != STORAGE_CLASS_EXTERN) {
 901                 add_entity_linkage(irentity, IR_LINKAGE_WEAK);
 902         }
 903 }
 904
 905 static bool is_main(entity_t *entity)
 906 {
 907         static symbol_t *sym_main = NULL;
 908         if (sym_main == NULL) {
 909                 sym_main = symbol_table_insert("main");
 910         }
 911
 912         if (entity->base.symbol != sym_main)
 913                 return false;
 914         /* must be in outermost scope */
 915         if (entity->base.parent_scope != &current_translation_unit->scope)
 916                 return false;
 917
 918         return true;
 919 }
 920
 921 /**
 922  * Creates an entity representing a function.
 923  *
 924  * @param entity       the function declaration/definition
 925  * @param owner_type   the owner type of this function, NULL
 926  *                     for global functions
 927  */
 928 static ir_entity *get_function_entity(entity_t *entity, ir_type *owner_type)
 929 {
 930         assert(entity->kind == ENTITY_FUNCTION);
 931         if (entity->function.irentity != NULL)
 932                 return entity->function.irentity;
 933
 934         switch (entity->function.btk) {
 935         case BUILTIN_NONE:
 936         case BUILTIN_LIBC:
 937         case BUILTIN_LIBC_CHECK:
 938                 break;
 939         default:
 940                 return NULL;
 941         }
 942
 943         symbol_t *symbol = entity->base.symbol;
 944         ident    *id     = new_id_from_str(symbol->string);
 945
 946         /* already an entity defined? */
 947         ir_entity *irentity = entitymap_get(&entitymap, symbol);
 948         bool const has_body = entity->function.statement != NULL;
 949         if (irentity != NULL) {
 950                 goto entity_created;
 951         }
 952
 953         ir_type *ir_type_method;
 954         if (entity->function.need_closure)
 955                 ir_type_method = create_method_type(&entity->declaration.type->function, true);
 956         else
 957                 ir_type_method = get_ir_type(entity->declaration.type);
 958
 959         bool nested_function = false;
 960         if (owner_type == NULL)
 961                 owner_type = get_glob_type();
 962         else
 963                 nested_function = true;
 964
 965         dbg_info *const dbgi = get_dbg_info(&entity->base.source_position);
 966         irentity = new_d_entity(owner_type, id, ir_type_method, dbgi);
 967
 968         ident *ld_id;
 969         if (nested_function)
 970                 ld_id = id_unique("inner.%u");
 971         else
 972                 ld_id = create_ld_ident(entity);
 973         set_entity_ld_ident(irentity, ld_id);
 974
 975         handle_decl_modifiers(irentity, entity);
 976
 977         if (! nested_function) {
 978                 storage_class_tag_t const storage_class
 979                         = (storage_class_tag_t) entity->declaration.storage_class;
 980                 if (storage_class == STORAGE_CLASS_STATIC) {
 981                     set_entity_visibility(irentity, ir_visibility_local);
 982                 } else {
 983                     set_entity_visibility(irentity, ir_visibility_external);
 984                 }
 985
 986                 bool const is_inline = entity->function.is_inline;
 987                 if (is_inline && has_body) {
 988                         if (((c_mode & _C99) && storage_class == STORAGE_CLASS_NONE)
 989                             || ((c_mode & _C99) == 0
 990                                 && storage_class == STORAGE_CLASS_EXTERN)) {
 991                                 add_entity_linkage(irentity, IR_LINKAGE_NO_CODEGEN);
 992                         }
 993                 }
 994         } else {
 995                 /* nested functions are always local */
 996                 set_entity_visibility(irentity, ir_visibility_local);
 997         }
 998
 999         /* We should check for file scope here, but as long as we compile C only
1000            this is not needed. */
1001         if (!freestanding && !has_body) {
1002                 /* check for a known runtime function */
1003                 for (size_t i = 0; i < lengthof(rts_data); ++i) {
1004                         if (id != rts_idents[i])
1005                                 continue;
1006
1007                         function_type_t *function_type
1008                                 = &entity->declaration.type->function;
1009                         /* rts_entities code can't handle a "wrong" number of parameters */
1010                         if (function_type->unspecified_parameters)
1011                                 continue;
1012
1013                         /* check number of parameters */
1014                         int n_params = count_parameters(function_type);
1015                         if (n_params != rts_data[i].n_params)
1016                                 continue;
1017
1018                         type_t *return_type = skip_typeref(function_type->return_type);
1019                         int     n_res       = is_type_void(return_type) ? 0 : 1;
1020                         if (n_res != rts_data[i].n_res)
1021                                 continue;
1022
1023                         /* ignore those rts functions not necessary needed for current mode */
1024                         if ((c_mode & rts_data[i].flags) == 0)
1025                                 continue;
1026                         assert(rts_entities[rts_data[i].id] == NULL);
1027                         rts_entities[rts_data[i].id] = irentity;
1028                 }
1029         }
1030
1031         entitymap_insert(&entitymap, symbol, irentity);
1032
1033 entity_created:
1034         entity->declaration.kind  = DECLARATION_KIND_FUNCTION;
1035         entity->function.irentity = irentity;
1036
1037         return irentity;
1038 }
1039
1040 /**
1041  * Creates a SymConst for a given entity.
1042  *
1043  * @param dbgi    debug info
1044  * @param entity  the entity
1045  */
1046 static ir_node *create_symconst(dbg_info *dbgi, ir_entity *entity)
1047 {
1048         assert(entity != NULL);
1049         union symconst_symbol sym;
1050         sym.entity_p = entity;
1051         return new_d_SymConst(dbgi, mode_P, sym, symconst_addr_ent);
1052 }
1053
1054 static ir_node *create_Const_from_bool(ir_mode *const mode, bool const v)
1055 {
1056         return new_Const((v ? get_mode_one : get_mode_null)(mode));
1057 }
1058
1059 static ir_node *create_conv_from_b(dbg_info *dbgi, ir_node *value,
1060                                    ir_mode *dest_mode)
1061 {
1062         if (is_Const(value)) {
1063                 return create_Const_from_bool(dest_mode, !is_Const_null(value));
1064         }
1065
1066         ir_node *cond       = new_d_Cond(dbgi, value);
1067         ir_node *proj_true  = new_Proj(cond, mode_X, pn_Cond_true);
1068         ir_node *proj_false = new_Proj(cond, mode_X, pn_Cond_false);
1069         ir_node *tblock     = new_Block(1, &proj_true);
1070         ir_node *fblock     = new_Block(1, &proj_false);
1071         set_cur_block(tblock);
1072         ir_node *const1 = new_Const(get_mode_one(dest_mode));
1073         ir_node *tjump  = new_Jmp();
1074         set_cur_block(fblock);
1075         ir_node *const0 = new_Const(get_mode_null(dest_mode));
1076         ir_node *fjump  = new_Jmp();
1077
1078         ir_node *in[2]      = { tjump, fjump };
1079         ir_node *mergeblock = new_Block(2, in);
1080         set_cur_block(mergeblock);
1081         ir_node *phi_in[2]  = { const1, const0 };
1082         ir_node *phi        = new_Phi(2, phi_in, dest_mode);
1083         return phi;
1084 }
1085
1086 static ir_node *create_conv(dbg_info *dbgi, ir_node *value, ir_mode *dest_mode)
1087 {
1088         ir_mode *value_mode = get_irn_mode(value);
1089
1090         if (value_mode == dest_mode)
1091                 return value;
1092
1093         if (dest_mode == mode_b) {
1094                 ir_node *zero = new_Const(get_mode_null(value_mode));
1095                 ir_node *cmp  = new_d_Cmp(dbgi, value, zero, ir_relation_unordered_less_greater);
1096                 return cmp;
1097         } else if (value_mode == mode_b) {
1098                 return create_conv_from_b(dbgi, value, dest_mode);
1099         }
1100
1101         return new_d_Conv(dbgi, value, dest_mode);
1102 }
1103
1104 /**
1105  * Creates a SymConst node representing a wide string literal.
1106  *
1107  * @param literal   the wide string literal
1108  */
1109 static ir_node *wide_string_literal_to_firm(
1110                 const string_literal_expression_t *literal)
1111 {
1112         ir_type  *const global_type = get_glob_type();
1113         ir_type  *const elem_type   = ir_type_wchar_t;
1114         dbg_info *const dbgi        = get_dbg_info(&literal->base.source_position);
1115         ir_type  *const type        = new_type_array(1, elem_type);
1116
1117         ident     *const id     = id_unique("str.%u");
1118         ir_entity *const entity = new_d_entity(global_type, id, type, dbgi);
1119         set_entity_ld_ident(entity, id);
1120         set_entity_visibility(entity, ir_visibility_private);
1121         add_entity_linkage(entity, IR_LINKAGE_CONSTANT);
1122
1123         ir_mode      *const mode = get_type_mode(elem_type);
1124         const size_t        slen = wstrlen(&literal->value);
1125
1126         set_array_lower_bound_int(type, 0, 0);
1127         set_array_upper_bound_int(type, 0, slen);
1128         set_type_size_bytes(type, slen * get_mode_size_bytes(mode));
1129         set_type_state(type, layout_fixed);
1130
1131         ir_initializer_t *initializer = create_initializer_compound(slen);
1132         const char              *p    = literal->value.begin;
1133         for (size_t i = 0; i < slen; ++i) {
1134                 assert(p < literal->value.begin + literal->value.size);
1135                 utf32             v   = read_utf8_char(&p);
1136                 ir_tarval        *tv  = new_tarval_from_long(v, mode);
1137                 ir_initializer_t *val = create_initializer_tarval(tv);
1138                 set_initializer_compound_value(initializer, i, val);
1139         }
1140         set_entity_initializer(entity, initializer);
1141
1142         return create_symconst(dbgi, entity);
1143 }
1144
1145 /**
1146  * Creates a SymConst node representing a string constant.
1147  *
1148  * @param src_pos    the source position of the string constant
1149  * @param id_prefix  a prefix for the name of the generated string constant
1150  * @param value      the value of the string constant
1151  */
1152 static ir_node *string_to_firm(const source_position_t *const src_pos,
1153                                const char *const id_prefix,
1154                                const string_t *const value)
1155 {
1156         ir_type  *const global_type = get_glob_type();
1157         dbg_info *const dbgi        = get_dbg_info(src_pos);
1158         ir_type  *const elem_type   = ir_type_char;
1159         ir_type  *const type        = new_type_array(1, elem_type);
1160
1161         ident     *const id     = id_unique(id_prefix);
1162         ir_entity *const entity = new_d_entity(global_type, id, type, dbgi);
1163         set_entity_ld_ident(entity, id);
1164         set_entity_visibility(entity, ir_visibility_private);
1165         add_entity_linkage(entity, IR_LINKAGE_CONSTANT);
1166
1167         ir_mode    *const mode   = get_type_mode(elem_type);
1168         const char* const string = value->begin;
1169         const size_t      slen   = value->size;
1170
1171         set_array_lower_bound_int(type, 0, 0);
1172         set_array_upper_bound_int(type, 0, slen);
1173         set_type_size_bytes(type, slen);
1174         set_type_state(type, layout_fixed);
1175
1176         ir_initializer_t *initializer = create_initializer_compound(slen);
1177         for (size_t i = 0; i < slen; ++i) {
1178                 ir_tarval        *tv  = new_tarval_from_long(string[i], mode);
1179                 ir_initializer_t *val = create_initializer_tarval(tv);
1180                 set_initializer_compound_value(initializer, i, val);
1181         }
1182         set_entity_initializer(entity, initializer);
1183
1184         return create_symconst(dbgi, entity);
1185 }
1186
1187 static bool try_create_integer(literal_expression_t *literal, type_t *type)
1188 {
1189         const char *string = literal->value.begin;
1190         size_t      size   = literal->value.size;
1191
1192         assert(type->kind == TYPE_ATOMIC);
1193         atomic_type_kind_t akind = type->atomic.akind;
1194
1195         ir_mode   *const mode = atomic_modes[akind];
1196         ir_tarval *const tv   = new_tarval_from_str(string, size, mode);
1197         if (tv == tarval_bad)
1198                 return false;
1199
1200         literal->base.type    = type;
1201         literal->target_value = tv;
1202         return true;
1203 }
1204
1205 static void create_integer_tarval(literal_expression_t *literal)
1206 {
1207         /* -1: signed only, 0: any, 1: unsigned only */
1208         int             sign   = literal->value.begin[0] != '0' /* decimal */ ? -1 : 0;
1209         unsigned        ls     = 0;
1210         const string_t *suffix = &literal->suffix;
1211         /* parse suffix */
1212         if (suffix->size > 0) {
1213                 for (const char *c = suffix->begin; *c != '\0'; ++c) {
1214                         if (*c == 'u' || *c == 'U') sign = 1;
1215                         if (*c == 'l' || *c == 'L') { ++ls; }
1216                 }
1217         }
1218
1219         tarval_int_overflow_mode_t old_mode = tarval_get_integer_overflow_mode();
1220
1221         /* now try if the constant is small enough for some types */
1222         tarval_set_integer_overflow_mode(TV_OVERFLOW_BAD);
1223         if (ls < 1) {
1224                 if (sign <= 0 && try_create_integer(literal, type_int))
1225                         goto finished;
1226                 if (sign >= 0 && try_create_integer(literal, type_unsigned_int))
1227                         goto finished;
1228         }
1229         if (ls < 2) {
1230                 if (sign <= 0 && try_create_integer(literal, type_long))
1231                         goto finished;
1232                 if (sign >= 0 && try_create_integer(literal, type_unsigned_long))
1233                         goto finished;
1234         }
1235         /* last try? then we should not report tarval_bad */
1236         if (sign < 0)
1237                 tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
1238         if (sign <= 0 && try_create_integer(literal, type_long_long))
1239                 goto finished;
1240
1241         /* last try */
1242         assert(sign >= 0);
1243         tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
1244         bool res = try_create_integer(literal, type_unsigned_long_long);
1245         if (!res)
1246                 panic("internal error when parsing number literal");
1247
1248 finished:
1249         tarval_set_integer_overflow_mode(old_mode);
1250 }
1251
1252 void determine_literal_type(literal_expression_t *literal)
1253 {
1254         switch (literal->base.kind) {
1255         case EXPR_LITERAL_INTEGER:
1256                 create_integer_tarval(literal);
1257                 return;
1258         default:
1259                 break;
1260         }
1261 }
1262
1263 /**
1264  * Creates a Const node representing a constant.
1265  */
1266 static ir_node *literal_to_firm(const literal_expression_t *literal)
1267 {
1268         type_t     *type   = skip_typeref(literal->base.type);
1269         ir_mode    *mode   = get_ir_mode_storage(type);
1270         const char *string = literal->value.begin;
1271         size_t      size   = literal->value.size;
1272         ir_tarval  *tv;
1273
1274         switch (literal->base.kind) {
1275         case EXPR_LITERAL_WIDE_CHARACTER: {
1276                 utf32  v = read_utf8_char(&string);
1277                 char   buf[128];
1278                 size_t len = snprintf(buf, sizeof(buf), UTF32_PRINTF_FORMAT, v);
1279
1280                 tv = new_tarval_from_str(buf, len, mode);
1281                 break;
1282         }
1283
1284         case EXPR_LITERAL_CHARACTER: {
1285                 long long int v;
1286                 bool char_is_signed
1287                         = get_atomic_type_flags(ATOMIC_TYPE_CHAR) & ATOMIC_TYPE_FLAG_SIGNED;
1288                 if (size == 1 && char_is_signed) {
1289                         v = (signed char)string[0];
1290                 } else {
1291                         v = 0;
1292                         for (size_t i = 0; i < size; ++i) {
1293                                 v = (v << 8) | ((unsigned char)string[i]);
1294                         }
1295                 }
1296                 char   buf[128];
1297                 size_t len = snprintf(buf, sizeof(buf), "%lld", v);
1298
1299                 tv = new_tarval_from_str(buf, len, mode);
1300                 break;
1301         }
1302
1303         case EXPR_LITERAL_INTEGER:
1304                 assert(literal->target_value != NULL);
1305                 tv = literal->target_value;
1306                 break;
1307
1308         case EXPR_LITERAL_FLOATINGPOINT:
1309                 tv = new_tarval_from_str(string, size, mode);
1310                 break;
1311
1312         case EXPR_LITERAL_BOOLEAN:
1313                 if (string[0] == 't') {
1314                         tv = get_mode_one(mode);
1315                 } else {
1316                         assert(string[0] == 'f');
1317         case EXPR_LITERAL_MS_NOOP:
1318                         tv = get_mode_null(mode);
1319                 }
1320                 break;
1321
1322         default:
1323                 panic("Invalid literal kind found");
1324         }
1325
1326         dbg_info *dbgi       = get_dbg_info(&literal->base.source_position);
1327         ir_node  *res        = new_d_Const(dbgi, tv);
1328         ir_mode  *mode_arith = get_ir_mode_arithmetic(type);
1329         return create_conv(dbgi, res, mode_arith);
1330 }
1331
1332 /*
1333  * Allocate an area of size bytes aligned at alignment
1334  * at a frame type.
1335  */
1336 static ir_entity *alloc_trampoline(ir_type *frame_type, int size, unsigned alignment)
1337 {
1338         static unsigned area_cnt = 0;
1339         char buf[32];
1340
1341         ir_type *tp = new_type_array(1, ir_type_char);
1342         set_array_bounds_int(tp, 0, 0, size);
1343         set_type_alignment_bytes(tp, alignment);
1344
1345         snprintf(buf, sizeof(buf), "trampolin%u", area_cnt++);
1346         ident *name = new_id_from_str(buf);
1347         ir_entity *area = new_entity(frame_type, name, tp);
1348
1349         /* mark this entity as compiler generated */
1350         set_entity_compiler_generated(area, 1);
1351         return area;
1352 }
1353
1354 /**
1355  * Return a node representing a trampoline region
1356  * for a given function entity.
1357  *
1358  * @param dbgi    debug info
1359  * @param entity  the function entity
1360  */
1361 static ir_node *get_trampoline_region(dbg_info *dbgi, ir_entity *entity)
1362 {
1363         ir_entity *region = NULL;
1364         int        i;
1365
1366         if (current_trampolines != NULL) {
1367                 for (i = ARR_LEN(current_trampolines) - 1; i >= 0; --i) {
1368                         if (current_trampolines[i].function == entity) {
1369                                 region = current_trampolines[i].region;
1370                                 break;
1371                         }
1372                 }
1373         } else {
1374                 current_trampolines = NEW_ARR_F(trampoline_region, 0);
1375         }
1376         ir_graph *irg = current_ir_graph;
1377         if (region == NULL) {
1378                 /* create a new region */
1379                 ir_type           *frame_tp = get_irg_frame_type(irg);
1380                 trampoline_region  reg;
1381                 reg.function = entity;
1382
1383                 reg.region   = alloc_trampoline(frame_tp,
1384                                                 be_params->trampoline_size,
1385                                                 be_params->trampoline_align);
1386                 ARR_APP1(trampoline_region, current_trampolines, reg);
1387                 region = reg.region;
1388         }
1389         return new_d_simpleSel(dbgi, get_irg_no_mem(irg), get_irg_frame(irg),
1390                                region);
1391 }
1392
1393 /**
1394  * Creates a trampoline for a function represented by an entity.
1395  *
1396  * @param dbgi    debug info
1397  * @param mode    the (reference) mode for the function address
1398  * @param entity  the function entity
1399  */
1400 static ir_node *create_trampoline(dbg_info *dbgi, ir_mode *mode,
1401                                   ir_entity *entity)
1402 {
1403         assert(entity != NULL);
1404         ir_node *in[3];
1405         in[0] = get_trampoline_region(dbgi, entity);
1406         in[1] = create_symconst(dbgi, entity);
1407         in[2] = get_irg_frame(current_ir_graph);
1408
1409         ir_node *irn = new_d_Builtin(dbgi, get_store(), 3, in, ir_bk_inner_trampoline, get_unknown_type());
1410         set_store(new_Proj(irn, mode_M, pn_Builtin_M));
1411         return new_Proj(irn, mode, pn_Builtin_max+1);
1412 }
1413
1414 /**
1415  * Dereference an address.
1416  *
1417  * @param dbgi  debug info
1418  * @param type  the type of the dereferenced result (the points_to type)
1419  * @param addr  the address to dereference
1420  */
1421 static ir_node *deref_address(dbg_info *const dbgi, type_t *const type,
1422                                       ir_node *const addr)
1423 {
1424         type_t *skipped = skip_typeref(type);
1425         if (is_type_incomplete(skipped))
1426                 return addr;
1427
1428         ir_type *irtype = get_ir_type(skipped);
1429         if (is_compound_type(irtype)
1430             || is_Method_type(irtype)
1431             || is_Array_type(irtype)) {
1432                 return addr;
1433         }
1434
1435         ir_cons_flags  flags    = skipped->base.qualifiers & TYPE_QUALIFIER_VOLATILE
1436                                   ? cons_volatile : cons_none;
1437         ir_mode *const mode     = get_type_mode(irtype);
1438         ir_node *const memory   = get_store();
1439         ir_node *const load     = new_d_Load(dbgi, memory, addr, mode, flags);
1440         ir_node *const load_mem = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1441         ir_node *const load_res = new_d_Proj(dbgi, load, mode,   pn_Load_res);
1442
1443         set_store(load_mem);
1444
1445         ir_mode *const mode_arithmetic = get_ir_mode_arithmetic(skipped);
1446         return create_conv(dbgi, load_res, mode_arithmetic);
1447 }
1448
1449 /**
1450  * Creates a strict Conv (to the node's mode) if necessary.
1451  *
1452  * @param dbgi  debug info
1453  * @param node  the node to strict conv
1454  */
1455 static ir_node *do_strict_conv(dbg_info *dbgi, ir_node *node)
1456 {
1457         ir_mode *mode = get_irn_mode(node);
1458
1459         if (!(get_irg_fp_model(current_ir_graph) & fp_explicit_rounding))
1460                 return node;
1461         if (!mode_is_float(mode))
1462                 return node;
1463
1464         /* check if there is already a Conv */
1465         if (is_Conv(node)) {
1466                 /* convert it into a strict Conv */
1467                 set_Conv_strict(node, 1);
1468                 return node;
1469         }
1470
1471         /* otherwise create a new one */
1472         return new_d_strictConv(dbgi, node, mode);
1473 }
1474
1475 /**
1476  * Returns the correct base address depending on whether it is a parameter or a
1477  * normal local variable.
1478  */
1479 static ir_node *get_local_frame(ir_entity *const ent)
1480 {
1481         ir_graph      *const irg   = current_ir_graph;
1482         const ir_type *const owner = get_entity_owner(ent);
1483         if (owner == current_outer_frame) {
1484                 assert(current_static_link != NULL);
1485                 return current_static_link;
1486         } else {
1487                 return get_irg_frame(irg);
1488         }
1489 }
1490
1491 /**
1492  * Keep all memory edges of the given block.
1493  */
1494 static void keep_all_memory(ir_node *block)
1495 {
1496         ir_node *old = get_cur_block();
1497
1498         set_cur_block(block);
1499         keep_alive(get_store());
1500         /* TODO: keep all memory edges from restricted pointers */
1501         set_cur_block(old);
1502 }
1503
1504 static ir_node *enum_constant_to_firm(reference_expression_t const *const ref)
1505 {
1506         entity_t *entity = ref->entity;
1507         if (entity->enum_value.tv == NULL) {
1508                 type_t *type = skip_typeref(entity->enum_value.enum_type);
1509                 assert(type->kind == TYPE_ENUM);
1510                 determine_enum_values(&type->enumt);
1511         }
1512
1513         return new_Const(entity->enum_value.tv);
1514 }
1515
1516 static ir_node *reference_addr(const reference_expression_t *ref)
1517 {
1518         dbg_info *dbgi   = get_dbg_info(&ref->base.source_position);
1519         entity_t *entity = ref->entity;
1520         assert(is_declaration(entity));
1521
1522         if (entity->kind == ENTITY_FUNCTION
1523             && entity->function.btk != BUILTIN_NONE) {
1524                 ir_entity *irentity = get_function_entity(entity, NULL);
1525                 /* for gcc compatibility we have to produce (dummy) addresses for some
1526                  * builtins which don't have entities */
1527                 if (irentity == NULL) {
1528                         source_position_t const *const pos = &ref->base.source_position;
1529                         warningf(WARN_OTHER, pos, "taking address of builtin '%N'", ref->entity);
1530
1531                         /* simply create a NULL pointer */
1532                         ir_mode  *mode = get_ir_mode_arithmetic(type_void_ptr);
1533                         ir_node  *res  = new_Const(get_mode_null(mode));
1534
1535                         return res;
1536                 }
1537         }
1538
1539         switch((declaration_kind_t) entity->declaration.kind) {
1540         case DECLARATION_KIND_UNKNOWN:
1541                 break;
1542         case DECLARATION_KIND_PARAMETER:
1543         case DECLARATION_KIND_LOCAL_VARIABLE:
1544                 /* you can store to a local variable (so we don't panic but return NULL
1545                  * as an indicator for no real address) */
1546                 return NULL;
1547         case DECLARATION_KIND_GLOBAL_VARIABLE: {
1548                 ir_node *const addr = create_symconst(dbgi, entity->variable.v.entity);
1549                 return addr;
1550         }
1551
1552         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY:
1553         case DECLARATION_KIND_PARAMETER_ENTITY: {
1554                 ir_entity *irentity = entity->variable.v.entity;
1555                 ir_node   *frame    = get_local_frame(irentity);
1556                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1557                 return sel;
1558         }
1559
1560         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
1561                 return entity->variable.v.vla_base;
1562
1563         case DECLARATION_KIND_FUNCTION: {
1564                 return create_symconst(dbgi, entity->function.irentity);
1565         }
1566
1567         case DECLARATION_KIND_INNER_FUNCTION: {
1568                 type_t  *const type = skip_typeref(entity->declaration.type);
1569                 ir_mode *const mode = get_ir_mode_storage(type);
1570                 if (!entity->function.goto_to_outer && !entity->function.need_closure) {
1571                         /* inner function not using the closure */
1572                         return create_symconst(dbgi, entity->function.irentity);
1573                 } else {
1574                         /* need trampoline here */
1575                         return create_trampoline(dbgi, mode, entity->function.irentity);
1576                 }
1577         }
1578
1579         case DECLARATION_KIND_COMPOUND_MEMBER:
1580                 panic("not implemented reference type");
1581         }
1582
1583         panic("reference to declaration with unknown type found");
1584 }
1585
1586 static ir_node *reference_expression_to_firm(const reference_expression_t *ref)
1587 {
1588         dbg_info *const dbgi   = get_dbg_info(&ref->base.source_position);
1589         entity_t *const entity = ref->entity;
1590         assert(is_declaration(entity));
1591
1592         switch ((declaration_kind_t)entity->declaration.kind) {
1593         case DECLARATION_KIND_LOCAL_VARIABLE:
1594         case DECLARATION_KIND_PARAMETER: {
1595                 type_t  *const type  = skip_typeref(entity->declaration.type);
1596                 ir_mode *const mode  = get_ir_mode_storage(type);
1597                 ir_node *const value = get_value(entity->variable.v.value_number, mode);
1598                 return create_conv(dbgi, value, get_ir_mode_arithmetic(type));
1599         }
1600
1601         default: {
1602                 ir_node *const addr = reference_addr(ref);
1603                 return deref_address(dbgi, entity->declaration.type, addr);
1604         }
1605         }
1606 }
1607
1608 /**
1609  * Transform calls to builtin functions.
1610  */
1611 static ir_node *process_builtin_call(const call_expression_t *call)
1612 {
1613         dbg_info *dbgi = get_dbg_info(&call->base.source_position);
1614
1615         assert(call->function->kind == EXPR_REFERENCE);
1616         reference_expression_t *builtin = &call->function->reference;
1617
1618         type_t *expr_type = skip_typeref(builtin->base.type);
1619         assert(is_type_pointer(expr_type));
1620
1621         type_t *function_type = skip_typeref(expr_type->pointer.points_to);
1622
1623         switch (builtin->entity->function.btk) {
1624         case BUILTIN_NONE:
1625                 break;
1626         case BUILTIN_ALLOCA: {
1627                 expression_t *argument = call->arguments->expression;
1628                 ir_node      *size     = expression_to_firm(argument);
1629
1630                 ir_node *store  = get_store();
1631                 ir_node *alloca = new_d_Alloc(dbgi, store, size, get_unknown_type(),
1632                                               stack_alloc);
1633                 ir_node *proj_m = new_Proj(alloca, mode_M, pn_Alloc_M);
1634                 set_store(proj_m);
1635                 ir_node *res    = new_Proj(alloca, mode_P_data, pn_Alloc_res);
1636
1637                 return res;
1638         }
1639         case BUILTIN_INF: {
1640                 type_t    *type = function_type->function.return_type;
1641                 ir_mode   *mode = get_ir_mode_arithmetic(type);
1642                 ir_tarval *tv   = get_mode_infinite(mode);
1643                 ir_node   *res  = new_d_Const(dbgi, tv);
1644                 return res;
1645         }
1646         case BUILTIN_NAN: {
1647                 /* Ignore string for now... */
1648                 assert(is_type_function(function_type));
1649                 type_t    *type = function_type->function.return_type;
1650                 ir_mode   *mode = get_ir_mode_arithmetic(type);
1651                 ir_tarval *tv   = get_mode_NAN(mode);
1652                 ir_node   *res  = new_d_Const(dbgi, tv);
1653                 return res;
1654         }
1655         case BUILTIN_EXPECT: {
1656                 expression_t *argument = call->arguments->expression;
1657                 return _expression_to_firm(argument);
1658         }
1659         case BUILTIN_VA_END:
1660                 /* evaluate the argument of va_end for its side effects */
1661                 _expression_to_firm(call->arguments->expression);
1662                 return NULL;
1663         case BUILTIN_OBJECT_SIZE: {
1664                 /* determine value of "type" */
1665                 expression_t *type_expression = call->arguments->next->expression;
1666                 long          type_val        = fold_constant_to_int(type_expression);
1667                 type_t       *type            = function_type->function.return_type;
1668                 ir_mode      *mode            = get_ir_mode_arithmetic(type);
1669                 /* just produce a "I don't know" result */
1670                 ir_tarval    *result          = type_val & 2 ? get_mode_null(mode) :
1671                                                 get_mode_minus_one(mode);
1672
1673                 return new_d_Const(dbgi, result);
1674         }
1675         case BUILTIN_ROTL: {
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                 return new_d_Rotl(dbgi, val, create_conv(dbgi, shf, mode_uint), mode);
1681         }
1682         case BUILTIN_ROTR: {
1683                 ir_node *val  = expression_to_firm(call->arguments->expression);
1684                 ir_node *shf  = expression_to_firm(call->arguments->next->expression);
1685                 ir_mode *mode = get_irn_mode(val);
1686                 ir_mode *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1687                 ir_node *c    = new_Const_long(mode_uint, get_mode_size_bits(mode));
1688                 ir_node *sub  = new_d_Sub(dbgi, c, create_conv(dbgi, shf, mode_uint), mode_uint);
1689                 return new_d_Rotl(dbgi, val, sub, mode);
1690         }
1691         case BUILTIN_FIRM:
1692                 break;
1693         case BUILTIN_LIBC:
1694         case BUILTIN_LIBC_CHECK:
1695                 panic("builtin did not produce an entity");
1696         }
1697         panic("invalid builtin found");
1698 }
1699
1700 /**
1701  * Transform a call expression.
1702  * Handles some special cases, like alloca() calls, which must be resolved
1703  * BEFORE the inlines runs. Inlining routines calling alloca() is dangerous,
1704  * 176.gcc for instance might allocate 2GB instead of 256 MB if alloca is not
1705  * handled right...
1706  */
1707 static ir_node *call_expression_to_firm(const call_expression_t *const call)
1708 {
1709         dbg_info *const dbgi = get_dbg_info(&call->base.source_position);
1710         assert(currently_reachable());
1711
1712         expression_t   *function = call->function;
1713         ir_node        *callee   = NULL;
1714         bool            firm_builtin = false;
1715         ir_builtin_kind firm_builtin_kind = ir_bk_trap;
1716         if (function->kind == EXPR_REFERENCE) {
1717                 const reference_expression_t *ref    = &function->reference;
1718                 entity_t                     *entity = ref->entity;
1719
1720                 if (entity->kind == ENTITY_FUNCTION) {
1721                         builtin_kind_t builtin = entity->function.btk;
1722                         if (builtin == BUILTIN_FIRM) {
1723                                 firm_builtin = true;
1724                                 firm_builtin_kind = entity->function.b.firm_builtin_kind;
1725                         } else if (builtin != BUILTIN_NONE && builtin != BUILTIN_LIBC
1726                                    && builtin != BUILTIN_LIBC_CHECK) {
1727                                 return process_builtin_call(call);
1728                         }
1729                 }
1730         }
1731         if (!firm_builtin)
1732                 callee = expression_to_firm(function);
1733
1734         type_t *type = skip_typeref(function->base.type);
1735         assert(is_type_pointer(type));
1736         pointer_type_t *pointer_type = &type->pointer;
1737         type_t         *points_to    = skip_typeref(pointer_type->points_to);
1738         assert(is_type_function(points_to));
1739         function_type_t *function_type = &points_to->function;
1740
1741         int      n_parameters    = 0;
1742         ir_type *ir_method_type  = get_ir_type((type_t*) function_type);
1743         ir_type *new_method_type = NULL;
1744         if (function_type->variadic || function_type->unspecified_parameters) {
1745                 const call_argument_t *argument = call->arguments;
1746                 for ( ; argument != NULL; argument = argument->next) {
1747                         ++n_parameters;
1748                 }
1749
1750                 /* we need to construct a new method type matching the call
1751                  * arguments... */
1752                 type_dbg_info *tdbgi = get_type_dbg_info_((const type_t*) function_type);
1753                 int n_res       = get_method_n_ress(ir_method_type);
1754                 new_method_type = new_d_type_method(n_parameters, n_res, tdbgi);
1755                 set_method_calling_convention(new_method_type,
1756                                get_method_calling_convention(ir_method_type));
1757                 set_method_additional_properties(new_method_type,
1758                                get_method_additional_properties(ir_method_type));
1759                 set_method_variadicity(new_method_type,
1760                                        get_method_variadicity(ir_method_type));
1761
1762                 for (int i = 0; i < n_res; ++i) {
1763                         set_method_res_type(new_method_type, i,
1764                                             get_method_res_type(ir_method_type, i));
1765                 }
1766                 argument = call->arguments;
1767                 for (int i = 0; i < n_parameters; ++i, argument = argument->next) {
1768                         expression_t *expression = argument->expression;
1769                         ir_type      *irtype     = get_ir_type(expression->base.type);
1770                         set_method_param_type(new_method_type, i, irtype);
1771                 }
1772                 ir_method_type = new_method_type;
1773         } else {
1774                 n_parameters = get_method_n_params(ir_method_type);
1775         }
1776
1777         ir_node *in[n_parameters];
1778
1779         const call_argument_t *argument = call->arguments;
1780         for (int n = 0; n < n_parameters; ++n) {
1781                 expression_t *expression = argument->expression;
1782                 ir_node      *arg_node   = expression_to_firm(expression);
1783
1784                 type_t *arg_type = skip_typeref(expression->base.type);
1785                 if (!is_type_compound(arg_type)) {
1786                         ir_mode *const mode = get_ir_mode_storage(arg_type);
1787                         arg_node = create_conv(dbgi, arg_node, mode);
1788                         arg_node = do_strict_conv(dbgi, arg_node);
1789                 }
1790
1791                 in[n] = arg_node;
1792
1793                 argument = argument->next;
1794         }
1795
1796         ir_node *store;
1797         if (function_type->modifiers & DM_CONST) {
1798                 store = get_irg_no_mem(current_ir_graph);
1799         } else {
1800                 store = get_store();
1801         }
1802
1803         ir_node *node;
1804         type_t  *return_type = skip_typeref(function_type->return_type);
1805         ir_node *result      = NULL;
1806         if (firm_builtin) {
1807                 node = new_d_Builtin(dbgi, store, n_parameters, in, firm_builtin_kind,
1808                                      ir_method_type);
1809                 if (! (function_type->modifiers & DM_CONST)) {
1810                         ir_node *mem = new_Proj(node, mode_M, pn_Builtin_M);
1811                         set_store(mem);
1812                 }
1813
1814                 if (!is_type_void(return_type)) {
1815                         assert(is_type_scalar(return_type));
1816                         ir_mode *mode = get_ir_mode_storage(return_type);
1817                         result = new_Proj(node, mode, pn_Builtin_max+1);
1818                         ir_mode *mode_arith = get_ir_mode_arithmetic(return_type);
1819                         result              = create_conv(NULL, result, mode_arith);
1820                 }
1821         } else {
1822                 node = new_d_Call(dbgi, store, callee, n_parameters, in, ir_method_type);
1823                 if (! (function_type->modifiers & DM_CONST)) {
1824                         ir_node *mem = new_Proj(node, mode_M, pn_Call_M);
1825                         set_store(mem);
1826                 }
1827
1828                 if (!is_type_void(return_type)) {
1829                         ir_node *const resproj    = new_Proj(node, mode_T, pn_Call_T_result);
1830                         ir_mode *const mode       = get_ir_mode_storage(return_type);
1831                         result                    = new_Proj(resproj, mode, 0);
1832                         ir_mode *const mode_arith = get_ir_mode_arithmetic(return_type);
1833                         result                    = create_conv(NULL, result, mode_arith);
1834                 }
1835         }
1836
1837         if (function_type->modifiers & DM_NORETURN) {
1838                 /* A dead end:  Keep the Call and the Block.  Also place all further
1839                  * nodes into a new and unreachable block. */
1840                 keep_alive(node);
1841                 keep_alive(get_cur_block());
1842                 ir_node *block = new_Block(0, NULL);
1843                 set_cur_block(block);
1844         }
1845
1846         return result;
1847 }
1848
1849 static ir_node *statement_to_firm(statement_t *statement);
1850 static ir_node *compound_statement_to_firm(compound_statement_t *compound);
1851
1852 static ir_node *expression_to_addr(const expression_t *expression);
1853 static ir_node *create_condition_evaluation(const expression_t *expression,
1854                                             ir_node *true_block,
1855                                             ir_node *false_block);
1856
1857 static void assign_value(dbg_info *dbgi, ir_node *addr, type_t *type,
1858                          ir_node *value)
1859 {
1860         if (!is_type_compound(type)) {
1861                 ir_mode *mode = get_ir_mode_storage(type);
1862                 value         = create_conv(dbgi, value, mode);
1863                 value         = do_strict_conv(dbgi, value);
1864         }
1865
1866         ir_node *memory = get_store();
1867
1868         if (is_type_scalar(type)) {
1869                 ir_cons_flags flags = type->base.qualifiers & TYPE_QUALIFIER_VOLATILE
1870                                       ? cons_volatile : cons_none;
1871                 ir_node  *store     = new_d_Store(dbgi, memory, addr, value, flags);
1872                 ir_node  *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
1873                 set_store(store_mem);
1874         } else {
1875                 ir_type *irtype    = get_ir_type(type);
1876                 ir_node *copyb     = new_d_CopyB(dbgi, memory, addr, value, irtype);
1877                 ir_node *copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
1878                 set_store(copyb_mem);
1879         }
1880 }
1881
1882 static ir_tarval *create_bitfield_mask(ir_mode *mode, int offset, int size)
1883 {
1884         ir_tarval *all_one   = get_mode_all_one(mode);
1885         int        mode_size = get_mode_size_bits(mode);
1886         ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1887
1888         assert(offset >= 0);
1889         assert(size   >= 0);
1890         assert(offset + size <= mode_size);
1891         if (size == mode_size) {
1892                 return all_one;
1893         }
1894
1895         long       shiftr    = get_mode_size_bits(mode) - size;
1896         long       shiftl    = offset;
1897         ir_tarval *tv_shiftr = new_tarval_from_long(shiftr, mode_uint);
1898         ir_tarval *tv_shiftl = new_tarval_from_long(shiftl, mode_uint);
1899         ir_tarval *mask0     = tarval_shr(all_one, tv_shiftr);
1900         ir_tarval *mask1     = tarval_shl(mask0, tv_shiftl);
1901
1902         return mask1;
1903 }
1904
1905 static ir_node *bitfield_store_to_firm(dbg_info *dbgi,
1906                 ir_entity *entity, ir_node *addr, ir_node *value, bool set_volatile,
1907                 bool need_return)
1908 {
1909         ir_type *entity_type = get_entity_type(entity);
1910         ir_type *base_type   = get_primitive_base_type(entity_type);
1911         ir_mode *mode        = get_type_mode(base_type);
1912         ir_mode *mode_uint   = atomic_modes[ATOMIC_TYPE_UINT];
1913
1914         value = create_conv(dbgi, value, mode);
1915
1916         /* kill upper bits of value and shift to right position */
1917         unsigned  bitoffset  = get_entity_offset_bits_remainder(entity);
1918         unsigned  bitsize    = get_mode_size_bits(get_type_mode(entity_type));
1919         unsigned  base_bits  = get_mode_size_bits(mode);
1920         unsigned  shiftwidth = base_bits - bitsize;
1921
1922         ir_node  *shiftcount = new_Const_long(mode_uint, shiftwidth);
1923         ir_node  *shiftl     = new_d_Shl(dbgi, value, shiftcount, mode);
1924
1925         unsigned  shrwidth   = base_bits - bitsize - bitoffset;
1926         ir_node  *shrconst   = new_Const_long(mode_uint, shrwidth);
1927         ir_node  *shiftr     = new_d_Shr(dbgi, shiftl, shrconst, mode);
1928
1929         /* load current value */
1930         ir_node   *mem             = get_store();
1931         ir_node   *load            = new_d_Load(dbgi, mem, addr, mode,
1932                                           set_volatile ? cons_volatile : cons_none);
1933         ir_node   *load_mem        = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1934         ir_node   *load_res        = new_d_Proj(dbgi, load, mode, pn_Load_res);
1935         ir_tarval *shift_mask      = create_bitfield_mask(mode, bitoffset, bitsize);
1936         ir_tarval *inv_mask        = tarval_not(shift_mask);
1937         ir_node   *inv_mask_node   = new_d_Const(dbgi, inv_mask);
1938         ir_node   *load_res_masked = new_d_And(dbgi, load_res, inv_mask_node, mode);
1939
1940         /* construct new value and store */
1941         ir_node *new_val   = new_d_Or(dbgi, load_res_masked, shiftr, mode);
1942         ir_node *store     = new_d_Store(dbgi, load_mem, addr, new_val,
1943                                          set_volatile ? cons_volatile : cons_none);
1944         ir_node *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
1945         set_store(store_mem);
1946
1947         if (!need_return)
1948                 return NULL;
1949
1950         ir_node *res_shr;
1951         ir_node *count_res_shr = new_Const_long(mode_uint, base_bits - bitsize);
1952         if (mode_is_signed(mode)) {
1953                 res_shr = new_d_Shrs(dbgi, shiftl, count_res_shr, mode);
1954         } else {
1955                 res_shr = new_d_Shr(dbgi, shiftl, count_res_shr, mode);
1956         }
1957         return res_shr;
1958 }
1959
1960 static ir_node *bitfield_extract_to_firm(const select_expression_t *expression,
1961                                          ir_node *addr)
1962 {
1963         dbg_info *dbgi      = get_dbg_info(&expression->base.source_position);
1964         entity_t *entity    = expression->compound_entry;
1965         type_t   *base_type = entity->declaration.type;
1966         ir_mode  *mode      = get_ir_mode_storage(base_type);
1967         ir_node  *mem       = get_store();
1968         ir_node  *load      = new_d_Load(dbgi, mem, addr, mode, cons_none);
1969         ir_node  *load_mem  = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1970         ir_node  *load_res  = new_d_Proj(dbgi, load, mode, pn_Load_res);
1971         ir_mode  *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1972
1973         ir_mode  *amode     = mode;
1974         /* optimisation, since shifting in modes < machine_size is usually
1975          * less efficient */
1976         if (get_mode_size_bits(amode) < get_mode_size_bits(mode_uint)) {
1977                 amode = mode_uint;
1978         }
1979         unsigned amode_size = get_mode_size_bits(amode);
1980         load_res = create_conv(dbgi, load_res, amode);
1981
1982         set_store(load_mem);
1983
1984         /* kill upper bits */
1985         assert(expression->compound_entry->kind == ENTITY_COMPOUND_MEMBER);
1986         unsigned   bitoffset   = entity->compound_member.bit_offset;
1987         unsigned   bitsize     = entity->compound_member.bit_size;
1988         unsigned   shift_bitsl = amode_size - bitoffset - bitsize;
1989         ir_tarval *tvl         = new_tarval_from_long((long)shift_bitsl, mode_uint);
1990         ir_node   *countl      = new_d_Const(dbgi, tvl);
1991         ir_node   *shiftl      = new_d_Shl(dbgi, load_res, countl, amode);
1992
1993         unsigned   shift_bitsr = bitoffset + shift_bitsl;
1994         assert(shift_bitsr <= amode_size);
1995         ir_tarval *tvr         = new_tarval_from_long((long)shift_bitsr, mode_uint);
1996         ir_node   *countr      = new_d_Const(dbgi, tvr);
1997         ir_node   *shiftr;
1998         if (mode_is_signed(mode)) {
1999                 shiftr = new_d_Shrs(dbgi, shiftl, countr, amode);
2000         } else {
2001                 shiftr = new_d_Shr(dbgi, shiftl, countr, amode);
2002         }
2003
2004         type_t  *type    = expression->base.type;
2005         ir_mode *resmode = get_ir_mode_arithmetic(type);
2006         return create_conv(dbgi, shiftr, resmode);
2007 }
2008
2009 /* make sure the selected compound type is constructed */
2010 static void construct_select_compound(const select_expression_t *expression)
2011 {
2012         type_t *type = skip_typeref(expression->compound->base.type);
2013         if (is_type_pointer(type)) {
2014                 type = type->pointer.points_to;
2015         }
2016         (void) get_ir_type(type);
2017 }
2018
2019 static ir_node *set_value_for_expression_addr(const expression_t *expression,
2020                                               ir_node *value, ir_node *addr)
2021 {
2022         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2023         type_t   *type = skip_typeref(expression->base.type);
2024
2025         if (!is_type_compound(type)) {
2026                 ir_mode  *mode = get_ir_mode_storage(type);
2027                 value          = create_conv(dbgi, value, mode);
2028                 value          = do_strict_conv(dbgi, value);
2029         }
2030
2031         if (expression->kind == EXPR_REFERENCE) {
2032                 const reference_expression_t *ref = &expression->reference;
2033
2034                 entity_t *entity = ref->entity;
2035                 assert(is_declaration(entity));
2036                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2037                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE ||
2038                     entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
2039                         set_value(entity->variable.v.value_number, value);
2040                         return value;
2041                 }
2042         }
2043
2044         if (addr == NULL)
2045                 addr = expression_to_addr(expression);
2046         assert(addr != NULL);
2047
2048         if (expression->kind == EXPR_SELECT) {
2049                 const select_expression_t *select = &expression->select;
2050
2051                 construct_select_compound(select);
2052
2053                 entity_t *entity = select->compound_entry;
2054                 assert(entity->kind == ENTITY_COMPOUND_MEMBER);
2055                 if (entity->compound_member.bitfield) {
2056                         ir_entity *irentity = entity->compound_member.entity;
2057                         bool       set_volatile
2058                                 = select->base.type->base.qualifiers & TYPE_QUALIFIER_VOLATILE;
2059                         value = bitfield_store_to_firm(dbgi, irentity, addr, value,
2060                                                        set_volatile, true);
2061                         return value;
2062                 }
2063         }
2064
2065         assign_value(dbgi, addr, type, value);
2066         return value;
2067 }
2068
2069 static void set_value_for_expression(const expression_t *expression,
2070                                      ir_node *value)
2071 {
2072         set_value_for_expression_addr(expression, value, NULL);
2073 }
2074
2075 static ir_node *get_value_from_lvalue(const expression_t *expression,
2076                                       ir_node *addr)
2077 {
2078         if (expression->kind == EXPR_REFERENCE) {
2079                 const reference_expression_t *ref = &expression->reference;
2080
2081                 entity_t *entity = ref->entity;
2082                 assert(entity->kind == ENTITY_VARIABLE
2083                                 || entity->kind == ENTITY_PARAMETER);
2084                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2085                 int value_number;
2086                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE ||
2087                     entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
2088                         value_number = entity->variable.v.value_number;
2089                         assert(addr == NULL);
2090                         type_t  *type = skip_typeref(expression->base.type);
2091                         ir_mode *mode = get_ir_mode_storage(type);
2092                         ir_node *res  = get_value(value_number, mode);
2093                         return create_conv(NULL, res, get_ir_mode_arithmetic(type));
2094                 }
2095         }
2096
2097         assert(addr != NULL);
2098         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2099
2100         ir_node *value;
2101         if (expression->kind == EXPR_SELECT &&
2102             expression->select.compound_entry->compound_member.bitfield) {
2103             construct_select_compound(&expression->select);
2104                 value = bitfield_extract_to_firm(&expression->select, addr);
2105         } else {
2106                 value = deref_address(dbgi, expression->base.type, addr);
2107         }
2108
2109         return value;
2110 }
2111
2112
2113 static ir_node *create_incdec(const unary_expression_t *expression)
2114 {
2115         dbg_info *const     dbgi = get_dbg_info(&expression->base.source_position);
2116         const expression_t *value_expr = expression->value;
2117         ir_node            *addr       = expression_to_addr(value_expr);
2118         ir_node            *value      = get_value_from_lvalue(value_expr, addr);
2119
2120         type_t  *type = skip_typeref(expression->base.type);
2121         ir_mode *mode = get_ir_mode_arithmetic(expression->base.type);
2122
2123         ir_node *offset;
2124         if (is_type_pointer(type)) {
2125                 pointer_type_t *pointer_type = &type->pointer;
2126                 offset = get_type_size_node(pointer_type->points_to);
2127         } else {
2128                 assert(is_type_arithmetic(type));
2129                 offset = new_Const(get_mode_one(mode));
2130         }
2131
2132         ir_node *result;
2133         ir_node *store_value;
2134         switch(expression->base.kind) {
2135         case EXPR_UNARY_POSTFIX_INCREMENT:
2136                 result      = value;
2137                 store_value = new_d_Add(dbgi, value, offset, mode);
2138                 break;
2139         case EXPR_UNARY_POSTFIX_DECREMENT:
2140                 result      = value;
2141                 store_value = new_d_Sub(dbgi, value, offset, mode);
2142                 break;
2143         case EXPR_UNARY_PREFIX_INCREMENT:
2144                 result      = new_d_Add(dbgi, value, offset, mode);
2145                 store_value = result;
2146                 break;
2147         case EXPR_UNARY_PREFIX_DECREMENT:
2148                 result      = new_d_Sub(dbgi, value, offset, mode);
2149                 store_value = result;
2150                 break;
2151         default:
2152                 panic("no incdec expr in create_incdec");
2153         }
2154
2155         set_value_for_expression_addr(value_expr, store_value, addr);
2156
2157         return result;
2158 }
2159
2160 static bool is_local_variable(expression_t *expression)
2161 {
2162         if (expression->kind != EXPR_REFERENCE)
2163                 return false;
2164         reference_expression_t *ref_expr = &expression->reference;
2165         entity_t               *entity   = ref_expr->entity;
2166         if (entity->kind != ENTITY_VARIABLE)
2167                 return false;
2168         assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2169         return entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE;
2170 }
2171
2172 static ir_relation get_relation(const expression_kind_t kind)
2173 {
2174         switch(kind) {
2175         case EXPR_BINARY_EQUAL:         return ir_relation_equal;
2176         case EXPR_BINARY_ISLESSGREATER: return ir_relation_less_greater;
2177         case EXPR_BINARY_NOTEQUAL:      return ir_relation_unordered_less_greater;
2178         case EXPR_BINARY_ISLESS:
2179         case EXPR_BINARY_LESS:          return ir_relation_less;
2180         case EXPR_BINARY_ISLESSEQUAL:
2181         case EXPR_BINARY_LESSEQUAL:     return ir_relation_less_equal;
2182         case EXPR_BINARY_ISGREATER:
2183         case EXPR_BINARY_GREATER:       return ir_relation_greater;
2184         case EXPR_BINARY_ISGREATEREQUAL:
2185         case EXPR_BINARY_GREATEREQUAL:  return ir_relation_greater_equal;
2186         case EXPR_BINARY_ISUNORDERED:   return ir_relation_unordered;
2187
2188         default:
2189                 break;
2190         }
2191         panic("trying to get pn_Cmp from non-comparison binexpr type");
2192 }
2193
2194 /**
2195  * Handle the assume optimizer hint: check if a Confirm
2196  * node can be created.
2197  *
2198  * @param dbi    debug info
2199  * @param expr   the IL assume expression
2200  *
2201  * we support here only some simple cases:
2202  *  - var rel const
2203  *  - const rel val
2204  *  - var rel var
2205  */
2206 static ir_node *handle_assume_compare(dbg_info *dbi,
2207                                       const binary_expression_t *expression)
2208 {
2209         expression_t *op1 = expression->left;
2210         expression_t *op2 = expression->right;
2211         entity_t     *var2, *var = NULL;
2212         ir_node      *res      = NULL;
2213         ir_relation   relation = get_relation(expression->base.kind);
2214
2215         if (is_local_variable(op1) && is_local_variable(op2)) {
2216                 var  = op1->reference.entity;
2217             var2 = op2->reference.entity;
2218
2219                 type_t  *const type = skip_typeref(var->declaration.type);
2220                 ir_mode *const mode = get_ir_mode_storage(type);
2221
2222                 ir_node *const irn1 = get_value(var->variable.v.value_number, mode);
2223                 ir_node *const irn2 = get_value(var2->variable.v.value_number, mode);
2224
2225                 res = new_d_Confirm(dbi, irn2, irn1, get_inversed_relation(relation));
2226                 set_value(var2->variable.v.value_number, res);
2227
2228                 res = new_d_Confirm(dbi, irn1, irn2, relation);
2229                 set_value(var->variable.v.value_number, res);
2230
2231                 return res;
2232         }
2233
2234         expression_t *con = NULL;
2235         if (is_local_variable(op1) && is_constant_expression(op2) == EXPR_CLASS_CONSTANT) {
2236                 var = op1->reference.entity;
2237                 con = op2;
2238         } else if (is_constant_expression(op1) == EXPR_CLASS_CONSTANT && is_local_variable(op2)) {
2239                 relation = get_inversed_relation(relation);
2240                 var = op2->reference.entity;
2241                 con = op1;
2242         }
2243
2244         if (var != NULL) {
2245                 type_t  *const type = skip_typeref(var->declaration.type);
2246                 ir_mode *const mode = get_ir_mode_storage(type);
2247
2248                 res = get_value(var->variable.v.value_number, mode);
2249                 res = new_d_Confirm(dbi, res, expression_to_firm(con), relation);
2250                 set_value(var->variable.v.value_number, res);
2251         }
2252         return res;
2253 }
2254
2255 /**
2256  * Handle the assume optimizer hint.
2257  *
2258  * @param dbi    debug info
2259  * @param expr   the IL assume expression
2260  */
2261 static ir_node *handle_assume(dbg_info *dbi, const expression_t *expression)
2262 {
2263         switch(expression->kind) {
2264         case EXPR_BINARY_EQUAL:
2265         case EXPR_BINARY_NOTEQUAL:
2266         case EXPR_BINARY_LESS:
2267         case EXPR_BINARY_LESSEQUAL:
2268         case EXPR_BINARY_GREATER:
2269         case EXPR_BINARY_GREATEREQUAL:
2270                 return handle_assume_compare(dbi, &expression->binary);
2271         default:
2272                 return NULL;
2273         }
2274 }
2275
2276 static ir_node *create_cast(dbg_info *dbgi, ir_node *value_node,
2277                             type_t *from_type, type_t *type)
2278 {
2279         type = skip_typeref(type);
2280         if (is_type_void(type)) {
2281                 /* make sure firm type is constructed */
2282                 (void) get_ir_type(type);
2283                 return NULL;
2284         }
2285         if (!is_type_scalar(type)) {
2286                 /* make sure firm type is constructed */
2287                 (void) get_ir_type(type);
2288                 return value_node;
2289         }
2290
2291         from_type     = skip_typeref(from_type);
2292         ir_mode *mode = get_ir_mode_storage(type);
2293         /* check for conversion from / to __based types */
2294         if (is_type_pointer(type) && is_type_pointer(from_type)) {
2295                 const variable_t *from_var = from_type->pointer.base_variable;
2296                 const variable_t *to_var   = type->pointer.base_variable;
2297                 if (from_var != to_var) {
2298                         if (from_var != NULL) {
2299                                 ir_node *const addr = create_symconst(dbgi, from_var->v.entity);
2300                                 ir_node *const base = deref_address(dbgi, from_var->base.type, addr);
2301                                 value_node = new_d_Add(dbgi, value_node, base, mode);
2302                         }
2303                         if (to_var != NULL) {
2304                                 ir_node *const addr = create_symconst(dbgi, to_var->v.entity);
2305                                 ir_node *const base = deref_address(dbgi, to_var->base.type, addr);
2306                                 value_node = new_d_Sub(dbgi, value_node, base, mode);
2307                         }
2308                 }
2309         }
2310
2311         if (is_type_atomic(type, ATOMIC_TYPE_BOOL)) {
2312                 /* bool adjustments (we save a mode_Bu, but have to temporarily
2313                  * convert to mode_b so we only get a 0/1 value */
2314                 value_node = create_conv(dbgi, value_node, mode_b);
2315         }
2316
2317         ir_mode *mode_arith = get_ir_mode_arithmetic(type);
2318         ir_node *node       = create_conv(dbgi, value_node, mode);
2319         node                = do_strict_conv(dbgi, node);
2320         node                = create_conv(dbgi, node, mode_arith);
2321
2322         return node;
2323 }
2324
2325 static ir_node *unary_expression_to_firm(const unary_expression_t *expression)
2326 {
2327         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2328         type_t   *type = skip_typeref(expression->base.type);
2329
2330         const expression_t *value = expression->value;
2331
2332         switch(expression->base.kind) {
2333         case EXPR_UNARY_TAKE_ADDRESS:
2334                 return expression_to_addr(value);
2335
2336         case EXPR_UNARY_NEGATE: {
2337                 ir_node *value_node = expression_to_firm(value);
2338                 ir_mode *mode       = get_ir_mode_arithmetic(type);
2339                 return new_d_Minus(dbgi, value_node, mode);
2340         }
2341         case EXPR_UNARY_PLUS:
2342                 return expression_to_firm(value);
2343         case EXPR_UNARY_BITWISE_NEGATE: {
2344                 ir_node *value_node = expression_to_firm(value);
2345                 ir_mode *mode       = get_ir_mode_arithmetic(type);
2346                 return new_d_Not(dbgi, value_node, mode);
2347         }
2348         case EXPR_UNARY_NOT: {
2349                 ir_node *value_node = _expression_to_firm(value);
2350                 value_node          = create_conv(dbgi, value_node, mode_b);
2351                 ir_node *res        = new_d_Not(dbgi, value_node, mode_b);
2352                 return res;
2353         }
2354         case EXPR_UNARY_DEREFERENCE: {
2355                 ir_node *value_node = expression_to_firm(value);
2356                 type_t  *value_type = skip_typeref(value->base.type);
2357                 assert(is_type_pointer(value_type));
2358
2359                 /* check for __based */
2360                 const variable_t *const base_var = value_type->pointer.base_variable;
2361                 if (base_var != NULL) {
2362                         ir_node *const addr = create_symconst(dbgi, base_var->v.entity);
2363                         ir_node *const base = deref_address(dbgi, base_var->base.type, addr);
2364                         value_node = new_d_Add(dbgi, value_node, base, get_ir_mode_storage(value_type));
2365                 }
2366                 type_t  *points_to  = value_type->pointer.points_to;
2367                 return deref_address(dbgi, points_to, value_node);
2368         }
2369         case EXPR_UNARY_POSTFIX_INCREMENT:
2370         case EXPR_UNARY_POSTFIX_DECREMENT:
2371         case EXPR_UNARY_PREFIX_INCREMENT:
2372         case EXPR_UNARY_PREFIX_DECREMENT:
2373                 return create_incdec(expression);
2374         case EXPR_UNARY_CAST: {
2375                 ir_node *value_node = expression_to_firm(value);
2376                 type_t  *from_type  = value->base.type;
2377                 return create_cast(dbgi, value_node, from_type, type);
2378         }
2379         case EXPR_UNARY_ASSUME:
2380                 return handle_assume(dbgi, value);
2381
2382         default:
2383                 break;
2384         }
2385         panic("invalid UNEXPR type found");
2386 }
2387
2388 /**
2389  * produces a 0/1 depending of the value of a mode_b node
2390  */
2391 static ir_node *produce_condition_result(const expression_t *expression,
2392                                          ir_mode *mode, dbg_info *dbgi)
2393 {
2394         ir_node *const one_block  = new_immBlock();
2395         ir_node *const zero_block = new_immBlock();
2396         create_condition_evaluation(expression, one_block, zero_block);
2397         mature_immBlock(one_block);
2398         mature_immBlock(zero_block);
2399
2400         ir_node *const jmp_one  = new_rd_Jmp(dbgi, one_block);
2401         ir_node *const jmp_zero = new_rd_Jmp(dbgi, zero_block);
2402         ir_node *const in_cf[2] = { jmp_one, jmp_zero };
2403         ir_node *const block    = new_Block(lengthof(in_cf), in_cf);
2404         set_cur_block(block);
2405
2406         ir_node *const one   = new_Const(get_mode_one(mode));
2407         ir_node *const zero  = new_Const(get_mode_null(mode));
2408         ir_node *const in[2] = { one, zero };
2409         ir_node *const val   = new_d_Phi(dbgi, lengthof(in), in, mode);
2410
2411         return val;
2412 }
2413
2414 static ir_node *adjust_for_pointer_arithmetic(dbg_info *dbgi,
2415                 ir_node *value, type_t *type)
2416 {
2417         ir_mode        *const mode         = get_ir_mode_arithmetic(type_ptrdiff_t);
2418         assert(is_type_pointer(type));
2419         pointer_type_t *const pointer_type = &type->pointer;
2420         type_t         *const points_to    = skip_typeref(pointer_type->points_to);
2421         ir_node        *      elem_size    = get_type_size_node(points_to);
2422         elem_size                          = create_conv(dbgi, elem_size, mode);
2423         value                              = create_conv(dbgi, value,     mode);
2424         ir_node        *const mul          = new_d_Mul(dbgi, value, elem_size, mode);
2425         return mul;
2426 }
2427
2428 static ir_node *create_op(dbg_info *dbgi, const binary_expression_t *expression,
2429                           ir_node *left, ir_node *right)
2430 {
2431         ir_mode  *mode;
2432         type_t   *type_left  = skip_typeref(expression->left->base.type);
2433         type_t   *type_right = skip_typeref(expression->right->base.type);
2434
2435         expression_kind_t kind = expression->base.kind;
2436
2437         switch (kind) {
2438         case EXPR_BINARY_SHIFTLEFT:
2439         case EXPR_BINARY_SHIFTRIGHT:
2440         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2441         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2442                 mode  = get_ir_mode_arithmetic(expression->base.type);
2443                 right = create_conv(dbgi, right, atomic_modes[ATOMIC_TYPE_UINT]);
2444                 break;
2445
2446         case EXPR_BINARY_SUB:
2447                 if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
2448                         const pointer_type_t *const ptr_type = &type_left->pointer;
2449
2450                         mode = get_ir_mode_arithmetic(expression->base.type);
2451                         ir_node *const elem_size = get_type_size_node(ptr_type->points_to);
2452                         ir_node *const conv_size = new_d_Conv(dbgi, elem_size, mode);
2453                         ir_node *const sub       = new_d_Sub(dbgi, left, right, mode);
2454                         ir_node *const no_mem    = new_NoMem();
2455                         ir_node *const div       = new_d_DivRL(dbgi, no_mem, sub, conv_size,
2456                                                                                                    mode, op_pin_state_floats);
2457                         return new_d_Proj(dbgi, div, mode, pn_Div_res);
2458                 }
2459                 /* fallthrough */
2460         case EXPR_BINARY_SUB_ASSIGN:
2461                 if (is_type_pointer(type_left)) {
2462                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2463                         mode  = get_ir_mode_arithmetic(type_left);
2464                         break;
2465                 }
2466                 goto normal_node;
2467
2468         case EXPR_BINARY_ADD:
2469         case EXPR_BINARY_ADD_ASSIGN:
2470                 if (is_type_pointer(type_left)) {
2471                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2472                         mode  = get_ir_mode_arithmetic(type_left);
2473                         break;
2474                 } else if (is_type_pointer(type_right)) {
2475                         left  = adjust_for_pointer_arithmetic(dbgi, left, type_right);
2476                         mode  = get_ir_mode_arithmetic(type_right);
2477                         break;
2478                 }
2479                 goto normal_node;
2480
2481         default:
2482 normal_node:
2483                 mode = get_ir_mode_arithmetic(type_right);
2484                 left = create_conv(dbgi, left, mode);
2485                 break;
2486         }
2487
2488         switch (kind) {
2489         case EXPR_BINARY_ADD_ASSIGN:
2490         case EXPR_BINARY_ADD:
2491                 return new_d_Add(dbgi, left, right, mode);
2492         case EXPR_BINARY_SUB_ASSIGN:
2493         case EXPR_BINARY_SUB:
2494                 return new_d_Sub(dbgi, left, right, mode);
2495         case EXPR_BINARY_MUL_ASSIGN:
2496         case EXPR_BINARY_MUL:
2497                 return new_d_Mul(dbgi, left, right, mode);
2498         case EXPR_BINARY_BITWISE_AND:
2499         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2500                 return new_d_And(dbgi, left, right, mode);
2501         case EXPR_BINARY_BITWISE_OR:
2502         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2503                 return new_d_Or(dbgi, left, right, mode);
2504         case EXPR_BINARY_BITWISE_XOR:
2505         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2506                 return new_d_Eor(dbgi, left, right, mode);
2507         case EXPR_BINARY_SHIFTLEFT:
2508         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2509                 return new_d_Shl(dbgi, left, right, mode);
2510         case EXPR_BINARY_SHIFTRIGHT:
2511         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2512                 if (mode_is_signed(mode)) {
2513                         return new_d_Shrs(dbgi, left, right, mode);
2514                 } else {
2515                         return new_d_Shr(dbgi, left, right, mode);
2516                 }
2517         case EXPR_BINARY_DIV:
2518         case EXPR_BINARY_DIV_ASSIGN: {
2519                 ir_node *pin = new_Pin(new_NoMem());
2520                 ir_node *op  = new_d_Div(dbgi, pin, left, right, mode,
2521                                          op_pin_state_floats);
2522                 ir_node *res = new_d_Proj(dbgi, op, mode, pn_Div_res);
2523                 return res;
2524         }
2525         case EXPR_BINARY_MOD:
2526         case EXPR_BINARY_MOD_ASSIGN: {
2527                 ir_node *pin = new_Pin(new_NoMem());
2528                 assert(!mode_is_float(mode));
2529                 ir_node *op  = new_d_Mod(dbgi, pin, left, right, mode,
2530                                          op_pin_state_floats);
2531                 ir_node *res = new_d_Proj(dbgi, op, mode, pn_Mod_res);
2532                 return res;
2533         }
2534         default:
2535                 panic("unexpected expression kind");
2536         }
2537 }
2538
2539 static ir_node *create_lazy_op(const binary_expression_t *expression)
2540 {
2541         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2542         type_t   *type = skip_typeref(expression->base.type);
2543         ir_mode  *mode = get_ir_mode_arithmetic(type);
2544
2545         if (is_constant_expression(expression->left) == EXPR_CLASS_CONSTANT) {
2546                 bool val = fold_constant_to_bool(expression->left);
2547                 expression_kind_t ekind = expression->base.kind;
2548                 assert(ekind == EXPR_BINARY_LOGICAL_AND || ekind == EXPR_BINARY_LOGICAL_OR);
2549                 if (ekind == EXPR_BINARY_LOGICAL_AND) {
2550                         if (!val) {
2551                                 return new_Const(get_mode_null(mode));
2552                         }
2553                 } else {
2554                         if (val) {
2555                                 return new_Const(get_mode_one(mode));
2556                         }
2557                 }
2558
2559                 if (is_constant_expression(expression->right) == EXPR_CLASS_CONSTANT) {
2560                         bool valr = fold_constant_to_bool(expression->right);
2561                         return create_Const_from_bool(mode, valr);
2562                 }
2563
2564                 return produce_condition_result(expression->right, mode, dbgi);
2565         }
2566
2567         return produce_condition_result((const expression_t*) expression, mode,
2568                                         dbgi);
2569 }
2570
2571 typedef ir_node * (*create_arithmetic_func)(dbg_info *dbgi, ir_node *left,
2572                                             ir_node *right, ir_mode *mode);
2573
2574 static ir_node *create_assign_binop(const binary_expression_t *expression)
2575 {
2576         dbg_info *const     dbgi = get_dbg_info(&expression->base.source_position);
2577         const expression_t *left_expr = expression->left;
2578         type_t             *type      = skip_typeref(left_expr->base.type);
2579         ir_node            *right     = expression_to_firm(expression->right);
2580         ir_node            *left_addr = expression_to_addr(left_expr);
2581         ir_node            *left      = get_value_from_lvalue(left_expr, left_addr);
2582         ir_node            *result    = create_op(dbgi, expression, left, right);
2583
2584         result = create_cast(dbgi, result, expression->right->base.type, type);
2585         result = do_strict_conv(dbgi, result);
2586
2587         result = set_value_for_expression_addr(left_expr, result, left_addr);
2588
2589         if (!is_type_compound(type)) {
2590                 ir_mode *mode_arithmetic = get_ir_mode_arithmetic(type);
2591                 result = create_conv(dbgi, result, mode_arithmetic);
2592         }
2593         return result;
2594 }
2595
2596 static ir_node *binary_expression_to_firm(const binary_expression_t *expression)
2597 {
2598         expression_kind_t kind = expression->base.kind;
2599
2600         switch(kind) {
2601         case EXPR_BINARY_EQUAL:
2602         case EXPR_BINARY_NOTEQUAL:
2603         case EXPR_BINARY_LESS:
2604         case EXPR_BINARY_LESSEQUAL:
2605         case EXPR_BINARY_GREATER:
2606         case EXPR_BINARY_GREATEREQUAL:
2607         case EXPR_BINARY_ISGREATER:
2608         case EXPR_BINARY_ISGREATEREQUAL:
2609         case EXPR_BINARY_ISLESS:
2610         case EXPR_BINARY_ISLESSEQUAL:
2611         case EXPR_BINARY_ISLESSGREATER:
2612         case EXPR_BINARY_ISUNORDERED: {
2613                 dbg_info   *dbgi     = get_dbg_info(&expression->base.source_position);
2614                 ir_node    *left     = expression_to_firm(expression->left);
2615                 ir_node    *right    = expression_to_firm(expression->right);
2616                 ir_relation relation = get_relation(kind);
2617                 ir_node    *cmp      = new_d_Cmp(dbgi, left, right, relation);
2618                 return cmp;
2619         }
2620         case EXPR_BINARY_ASSIGN: {
2621                 ir_node *addr  = expression_to_addr(expression->left);
2622                 ir_node *right = expression_to_firm(expression->right);
2623                 ir_node *res
2624                         = set_value_for_expression_addr(expression->left, right, addr);
2625
2626                 type_t  *type            = skip_typeref(expression->base.type);
2627                 if (!is_type_compound(type)) {
2628                         ir_mode *mode_arithmetic = get_ir_mode_arithmetic(type);
2629                         res                      = create_conv(NULL, res, mode_arithmetic);
2630                 }
2631                 return res;
2632         }
2633         case EXPR_BINARY_ADD:
2634         case EXPR_BINARY_SUB:
2635         case EXPR_BINARY_MUL:
2636         case EXPR_BINARY_DIV:
2637         case EXPR_BINARY_MOD:
2638         case EXPR_BINARY_BITWISE_AND:
2639         case EXPR_BINARY_BITWISE_OR:
2640         case EXPR_BINARY_BITWISE_XOR:
2641         case EXPR_BINARY_SHIFTLEFT:
2642         case EXPR_BINARY_SHIFTRIGHT:
2643         {
2644                 dbg_info *dbgi  = get_dbg_info(&expression->base.source_position);
2645                 ir_node  *left  = expression_to_firm(expression->left);
2646                 ir_node  *right = expression_to_firm(expression->right);
2647                 return create_op(dbgi, expression, left, right);
2648         }
2649         case EXPR_BINARY_LOGICAL_AND:
2650         case EXPR_BINARY_LOGICAL_OR:
2651                 return create_lazy_op(expression);
2652         case EXPR_BINARY_COMMA:
2653                 /* create side effects of left side */
2654                 (void) expression_to_firm(expression->left);
2655                 return _expression_to_firm(expression->right);
2656
2657         case EXPR_BINARY_ADD_ASSIGN:
2658         case EXPR_BINARY_SUB_ASSIGN:
2659         case EXPR_BINARY_MUL_ASSIGN:
2660         case EXPR_BINARY_MOD_ASSIGN:
2661         case EXPR_BINARY_DIV_ASSIGN:
2662         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2663         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2664         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2665         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2666         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2667                 return create_assign_binop(expression);
2668         default:
2669                 panic("TODO binexpr type");
2670         }
2671 }
2672
2673 static ir_node *array_access_addr(const array_access_expression_t *expression)
2674 {
2675         dbg_info *dbgi        = get_dbg_info(&expression->base.source_position);
2676         ir_node  *base_addr   = expression_to_firm(expression->array_ref);
2677         ir_node  *offset      = expression_to_firm(expression->index);
2678         type_t   *ref_type    = skip_typeref(expression->array_ref->base.type);
2679         ir_node  *real_offset = adjust_for_pointer_arithmetic(dbgi, offset, ref_type);
2680         ir_node  *result      = new_d_Add(dbgi, base_addr, real_offset, mode_P_data);
2681
2682         return result;
2683 }
2684
2685 static ir_node *array_access_to_firm(
2686                 const array_access_expression_t *expression)
2687 {
2688         dbg_info *dbgi   = get_dbg_info(&expression->base.source_position);
2689         ir_node  *addr   = array_access_addr(expression);
2690         type_t   *type   = revert_automatic_type_conversion(
2691                         (const expression_t*) expression);
2692         type             = skip_typeref(type);
2693
2694         return deref_address(dbgi, type, addr);
2695 }
2696
2697 static long get_offsetof_offset(const offsetof_expression_t *expression)
2698 {
2699         type_t *orig_type = expression->type;
2700         long    offset    = 0;
2701
2702         designator_t *designator = expression->designator;
2703         for ( ; designator != NULL; designator = designator->next) {
2704                 type_t *type = skip_typeref(orig_type);
2705                 /* be sure the type is constructed */
2706                 (void) get_ir_type(type);
2707
2708                 if (designator->symbol != NULL) {
2709                         assert(is_type_compound(type));
2710                         symbol_t *symbol = designator->symbol;
2711
2712                         compound_t *compound = type->compound.compound;
2713                         entity_t   *iter     = compound->members.entities;
2714                         for ( ; iter != NULL; iter = iter->base.next) {
2715                                 if (iter->base.symbol == symbol) {
2716                                         break;
2717                                 }
2718                         }
2719                         assert(iter != NULL);
2720
2721                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
2722                         assert(iter->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
2723                         offset += get_entity_offset(iter->compound_member.entity);
2724
2725                         orig_type = iter->declaration.type;
2726                 } else {
2727                         expression_t *array_index = designator->array_index;
2728                         assert(designator->array_index != NULL);
2729                         assert(is_type_array(type));
2730
2731                         long index         = fold_constant_to_int(array_index);
2732                         ir_type *arr_type  = get_ir_type(type);
2733                         ir_type *elem_type = get_array_element_type(arr_type);
2734                         long     elem_size = get_type_size_bytes(elem_type);
2735
2736                         offset += index * elem_size;
2737
2738                         orig_type = type->array.element_type;
2739                 }
2740         }
2741
2742         return offset;
2743 }
2744
2745 static ir_node *offsetof_to_firm(const offsetof_expression_t *expression)
2746 {
2747         ir_mode   *mode   = get_ir_mode_arithmetic(expression->base.type);
2748         long       offset = get_offsetof_offset(expression);
2749         ir_tarval *tv     = new_tarval_from_long(offset, mode);
2750         dbg_info  *dbgi   = get_dbg_info(&expression->base.source_position);
2751
2752         return new_d_Const(dbgi, tv);
2753 }
2754
2755 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
2756                                      ir_entity *entity, type_t *type);
2757 static ir_initializer_t *create_ir_initializer(
2758                 const initializer_t *initializer, type_t *type);
2759
2760 static ir_entity *create_initializer_entity(dbg_info *dbgi,
2761                                             initializer_t *initializer,
2762                                             type_t *type)
2763 {
2764         /* create the ir_initializer */
2765         ir_graph *const old_current_ir_graph = current_ir_graph;
2766         current_ir_graph = get_const_code_irg();
2767
2768         ir_initializer_t *irinitializer = create_ir_initializer(initializer, type);
2769
2770         assert(current_ir_graph == get_const_code_irg());
2771         current_ir_graph = old_current_ir_graph;
2772
2773         ident     *const id          = id_unique("initializer.%u");
2774         ir_type   *const irtype      = get_ir_type(type);
2775         ir_type   *const global_type = get_glob_type();
2776         ir_entity *const entity      = new_d_entity(global_type, id, irtype, dbgi);
2777         set_entity_ld_ident(entity, id);
2778         set_entity_visibility(entity, ir_visibility_private);
2779         add_entity_linkage(entity, IR_LINKAGE_CONSTANT);
2780         set_entity_initializer(entity, irinitializer);
2781         return entity;
2782 }
2783
2784 static ir_node *compound_literal_addr(compound_literal_expression_t const *const expression)
2785 {
2786         dbg_info      *dbgi        = get_dbg_info(&expression->base.source_position);
2787         type_t        *type        = expression->type;
2788         initializer_t *initializer = expression->initializer;
2789
2790         if (is_constant_initializer(initializer) == EXPR_CLASS_CONSTANT) {
2791                 ir_entity *entity = create_initializer_entity(dbgi, initializer, type);
2792                 return create_symconst(dbgi, entity);
2793         } else {
2794                 /* create an entity on the stack */
2795                 ident   *const id     = id_unique("CompLit.%u");
2796                 ir_type *const irtype = get_ir_type(type);
2797                 ir_type *frame_type   = get_irg_frame_type(current_ir_graph);
2798
2799                 ir_entity *const entity = new_d_entity(frame_type, id, irtype, dbgi);
2800                 set_entity_ld_ident(entity, id);
2801
2802                 /* create initialisation code */
2803                 create_local_initializer(initializer, dbgi, entity, type);
2804
2805                 /* create a sel for the compound literal address */
2806                 ir_node *frame = get_irg_frame(current_ir_graph);
2807                 ir_node *sel   = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
2808                 return sel;
2809         }
2810 }
2811
2812 static ir_node *compound_literal_to_firm(compound_literal_expression_t const* const expr)
2813 {
2814         dbg_info *const dbgi = get_dbg_info(&expr->base.source_position);
2815         type_t   *const type = expr->type;
2816         ir_node  *const addr = compound_literal_addr(expr);
2817         return deref_address(dbgi, type, addr);
2818 }
2819
2820 /**
2821  * Transform a sizeof expression into Firm code.
2822  */
2823 static ir_node *sizeof_to_firm(const typeprop_expression_t *expression)
2824 {
2825         type_t *const type = skip_typeref(expression->type);
2826         /* §6.5.3.4:2 if the type is a VLA, evaluate the expression. */
2827         if (is_type_array(type) && type->array.is_vla
2828                         && expression->tp_expression != NULL) {
2829                 expression_to_firm(expression->tp_expression);
2830         }
2831
2832         return get_type_size_node(type);
2833 }
2834
2835 static entity_t *get_expression_entity(const expression_t *expression)
2836 {
2837         if (expression->kind != EXPR_REFERENCE)
2838                 return NULL;
2839
2840         return expression->reference.entity;
2841 }
2842
2843 static unsigned get_cparser_entity_alignment(const entity_t *entity)
2844 {
2845         switch(entity->kind) {
2846         case DECLARATION_KIND_CASES:
2847                 return entity->declaration.alignment;
2848         case ENTITY_STRUCT:
2849         case ENTITY_UNION:
2850                 return entity->compound.alignment;
2851         case ENTITY_TYPEDEF:
2852                 return entity->typedefe.alignment;
2853         default:
2854                 break;
2855         }
2856         return 0;
2857 }
2858
2859 /**
2860  * Transform an alignof expression into Firm code.
2861  */
2862 static ir_node *alignof_to_firm(const typeprop_expression_t *expression)
2863 {
2864         unsigned alignment = 0;
2865
2866         const expression_t *tp_expression = expression->tp_expression;
2867         if (tp_expression != NULL) {
2868                 entity_t *entity = get_expression_entity(tp_expression);
2869                 if (entity != NULL) {
2870                         alignment = get_cparser_entity_alignment(entity);
2871                 }
2872         }
2873
2874         if (alignment == 0) {
2875                 type_t *type = expression->type;
2876                 alignment = get_type_alignment(type);
2877         }
2878
2879         dbg_info  *dbgi = get_dbg_info(&expression->base.source_position);
2880         ir_mode   *mode = get_ir_mode_arithmetic(expression->base.type);
2881         ir_tarval *tv   = new_tarval_from_long(alignment, mode);
2882         return new_d_Const(dbgi, tv);
2883 }
2884
2885 static void init_ir_types(void);
2886
2887 static ir_tarval *fold_constant_to_tarval(const expression_t *expression)
2888 {
2889         assert(is_constant_expression(expression) == EXPR_CLASS_CONSTANT);
2890
2891         bool constant_folding_old = constant_folding;
2892         constant_folding = true;
2893         int old_optimize         = get_optimize();
2894         int old_constant_folding = get_opt_constant_folding();
2895         set_optimize(1);
2896         set_opt_constant_folding(1);
2897
2898         init_ir_types();
2899
2900         ir_graph *old_current_ir_graph = current_ir_graph;
2901         current_ir_graph = get_const_code_irg();
2902
2903         ir_node *const cnst = _expression_to_firm(expression);
2904
2905         current_ir_graph = old_current_ir_graph;
2906         set_optimize(old_optimize);
2907         set_opt_constant_folding(old_constant_folding);
2908
2909         if (!is_Const(cnst)) {
2910                 panic("couldn't fold constant");
2911         }
2912
2913         constant_folding = constant_folding_old;
2914
2915         ir_tarval *const tv   = get_Const_tarval(cnst);
2916         ir_mode   *const mode = get_ir_mode_arithmetic(skip_typeref(expression->base.type));
2917         return tarval_convert_to(tv, mode);
2918 }
2919
2920 /* this function is only used in parser.c, but it relies on libfirm functionality */
2921 bool constant_is_negative(const expression_t *expression)
2922 {
2923         ir_tarval *tv = fold_constant_to_tarval(expression);
2924         return tarval_is_negative(tv);
2925 }
2926
2927 long fold_constant_to_int(const expression_t *expression)
2928 {
2929         ir_tarval *tv = fold_constant_to_tarval(expression);
2930         if (!tarval_is_long(tv)) {
2931                 panic("result of constant folding is not integer");
2932         }
2933
2934         return get_tarval_long(tv);
2935 }
2936
2937 bool fold_constant_to_bool(const expression_t *expression)
2938 {
2939         ir_tarval *tv = fold_constant_to_tarval(expression);
2940         return !tarval_is_null(tv);
2941 }
2942
2943 static ir_node *conditional_to_firm(const conditional_expression_t *expression)
2944 {
2945         dbg_info *const dbgi = get_dbg_info(&expression->base.source_position);
2946
2947         /* first try to fold a constant condition */
2948         if (is_constant_expression(expression->condition) == EXPR_CLASS_CONSTANT) {
2949                 bool val = fold_constant_to_bool(expression->condition);
2950                 if (val) {
2951                         expression_t *true_expression = expression->true_expression;
2952                         if (true_expression == NULL)
2953                                 true_expression = expression->condition;
2954                         return expression_to_firm(true_expression);
2955                 } else {
2956                         return expression_to_firm(expression->false_expression);
2957                 }
2958         }
2959
2960         ir_node *const true_block  = new_immBlock();
2961         ir_node *const false_block = new_immBlock();
2962         ir_node *const cond_expr   = create_condition_evaluation(expression->condition, true_block, false_block);
2963         mature_immBlock(true_block);
2964         mature_immBlock(false_block);
2965
2966         set_cur_block(true_block);
2967         ir_node *true_val;
2968         if (expression->true_expression != NULL) {
2969                 true_val = expression_to_firm(expression->true_expression);
2970         } else if (cond_expr != NULL && get_irn_mode(cond_expr) != mode_b) {
2971                 true_val = cond_expr;
2972         } else {
2973                 /* Condition ended with a short circuit (&&, ||, !) operation or a
2974                  * comparison.  Generate a "1" as value for the true branch. */
2975                 true_val = new_Const(get_mode_one(mode_Is));
2976         }
2977         ir_node *const true_jmp = new_d_Jmp(dbgi);
2978
2979         set_cur_block(false_block);
2980         ir_node *const false_val = expression_to_firm(expression->false_expression);
2981         ir_node *const false_jmp = new_d_Jmp(dbgi);
2982
2983         /* create the common block */
2984         ir_node *const in_cf[2] = { true_jmp, false_jmp };
2985         ir_node *const block    = new_Block(lengthof(in_cf), in_cf);
2986         set_cur_block(block);
2987
2988         /* TODO improve static semantics, so either both or no values are NULL */
2989         if (true_val == NULL || false_val == NULL)
2990                 return NULL;
2991
2992         ir_node *const in[2] = { true_val, false_val };
2993         type_t  *const type  = skip_typeref(expression->base.type);
2994         ir_mode *const mode  = get_ir_mode_arithmetic(type);
2995         ir_node *const val   = new_d_Phi(dbgi, lengthof(in), in, mode);
2996
2997         return val;
2998 }
2999
3000 /**
3001  * Returns an IR-node representing the address of a field.
3002  */
3003 static ir_node *select_addr(const select_expression_t *expression)
3004 {
3005         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3006
3007         construct_select_compound(expression);
3008
3009         ir_node *compound_addr = expression_to_firm(expression->compound);
3010
3011         entity_t *entry = expression->compound_entry;
3012         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3013         assert(entry->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
3014
3015         if (constant_folding) {
3016                 ir_mode *mode      = get_irn_mode(compound_addr);
3017                 ir_mode *mode_uint = get_reference_mode_unsigned_eq(mode);
3018                 ir_node *ofs       = new_Const_long(mode_uint, entry->compound_member.offset);
3019                 return new_d_Add(dbgi, compound_addr, ofs, mode);
3020         } else {
3021                 ir_entity *irentity = entry->compound_member.entity;
3022                 assert(irentity != NULL);
3023                 return new_d_simpleSel(dbgi, new_NoMem(), compound_addr, irentity);
3024         }
3025 }
3026
3027 static ir_node *select_to_firm(const select_expression_t *expression)
3028 {
3029         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3030         ir_node  *addr = select_addr(expression);
3031         type_t   *type = revert_automatic_type_conversion(
3032                         (const expression_t*) expression);
3033         type           = skip_typeref(type);
3034
3035         entity_t *entry = expression->compound_entry;
3036         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3037
3038         if (entry->compound_member.bitfield) {
3039                 return bitfield_extract_to_firm(expression, addr);
3040         }
3041
3042         return deref_address(dbgi, type, addr);
3043 }
3044
3045 /* Values returned by __builtin_classify_type. */
3046 typedef enum gcc_type_class
3047 {
3048         no_type_class = -1,
3049         void_type_class,
3050         integer_type_class,
3051         char_type_class,
3052         enumeral_type_class,
3053         boolean_type_class,
3054         pointer_type_class,
3055         reference_type_class,
3056         offset_type_class,
3057         real_type_class,
3058         complex_type_class,
3059         function_type_class,
3060         method_type_class,
3061         record_type_class,
3062         union_type_class,
3063         array_type_class,
3064         string_type_class,
3065         set_type_class,
3066         file_type_class,
3067         lang_type_class
3068 } gcc_type_class;
3069
3070 static ir_node *classify_type_to_firm(const classify_type_expression_t *const expr)
3071 {
3072         type_t *type = expr->type_expression->base.type;
3073
3074         /* FIXME gcc returns different values depending on whether compiling C or C++
3075          * e.g. int x[10] is pointer_type_class in C, but array_type_class in C++ */
3076         gcc_type_class tc;
3077         for (;;) {
3078                 type = skip_typeref(type);
3079                 switch (type->kind) {
3080                         case TYPE_ATOMIC: {
3081                                 const atomic_type_t *const atomic_type = &type->atomic;
3082                                 switch (atomic_type->akind) {
3083                                         /* should not be reached */
3084                                         case ATOMIC_TYPE_INVALID:
3085                                                 tc = no_type_class;
3086                                                 goto make_const;
3087
3088                                         /* gcc cannot do that */
3089                                         case ATOMIC_TYPE_VOID:
3090                                                 tc = void_type_class;
3091                                                 goto make_const;
3092
3093                                         case ATOMIC_TYPE_WCHAR_T:   /* gcc handles this as integer */
3094                                         case ATOMIC_TYPE_CHAR:      /* gcc handles this as integer */
3095                                         case ATOMIC_TYPE_SCHAR:     /* gcc handles this as integer */
3096                                         case ATOMIC_TYPE_UCHAR:     /* gcc handles this as integer */
3097                                         case ATOMIC_TYPE_SHORT:
3098                                         case ATOMIC_TYPE_USHORT:
3099                                         case ATOMIC_TYPE_INT:
3100                                         case ATOMIC_TYPE_UINT:
3101                                         case ATOMIC_TYPE_LONG:
3102                                         case ATOMIC_TYPE_ULONG:
3103                                         case ATOMIC_TYPE_LONGLONG:
3104                                         case ATOMIC_TYPE_ULONGLONG:
3105                                         case ATOMIC_TYPE_BOOL:      /* gcc handles this as integer */
3106                                                 tc = integer_type_class;
3107                                                 goto make_const;
3108
3109                                         case ATOMIC_TYPE_FLOAT:
3110                                         case ATOMIC_TYPE_DOUBLE:
3111                                         case ATOMIC_TYPE_LONG_DOUBLE:
3112                                                 tc = real_type_class;
3113                                                 goto make_const;
3114                                 }
3115                                 panic("Unexpected atomic type in classify_type_to_firm().");
3116                         }
3117
3118                         case TYPE_COMPLEX:         tc = complex_type_class; goto make_const;
3119                         case TYPE_IMAGINARY:       tc = complex_type_class; goto make_const;
3120                         case TYPE_ARRAY:           /* gcc handles this as pointer */
3121                         case TYPE_FUNCTION:        /* gcc handles this as pointer */
3122                         case TYPE_POINTER:         tc = pointer_type_class; goto make_const;
3123                         case TYPE_COMPOUND_STRUCT: tc = record_type_class;  goto make_const;
3124                         case TYPE_COMPOUND_UNION:  tc = union_type_class;   goto make_const;
3125
3126                         /* gcc handles this as integer */
3127                         case TYPE_ENUM:            tc = integer_type_class; goto make_const;
3128
3129                         /* gcc classifies the referenced type */
3130                         case TYPE_REFERENCE: type = type->reference.refers_to; continue;
3131
3132                         /* typedef/typeof should be skipped already */
3133                         case TYPE_TYPEDEF:
3134                         case TYPE_TYPEOF:
3135                         case TYPE_ERROR:
3136                                 break;
3137                 }
3138                 panic("unexpected TYPE classify_type_to_firm().");
3139         }
3140
3141 make_const:;
3142         dbg_info  *const dbgi = get_dbg_info(&expr->base.source_position);
3143         ir_mode   *const mode = atomic_modes[ATOMIC_TYPE_INT];
3144         ir_tarval *const tv   = new_tarval_from_long(tc, mode);
3145         return new_d_Const(dbgi, tv);
3146 }
3147
3148 static ir_node *function_name_to_firm(
3149                 const funcname_expression_t *const expr)
3150 {
3151         switch(expr->kind) {
3152         case FUNCNAME_FUNCTION:
3153         case FUNCNAME_PRETTY_FUNCTION:
3154         case FUNCNAME_FUNCDNAME:
3155                 if (current_function_name == NULL) {
3156                         const source_position_t *const src_pos = &expr->base.source_position;
3157                         const char    *name  = current_function_entity->base.symbol->string;
3158                         const string_t string = { name, strlen(name) + 1 };
3159                         current_function_name = string_to_firm(src_pos, "__func__.%u", &string);
3160                 }
3161                 return current_function_name;
3162         case FUNCNAME_FUNCSIG:
3163                 if (current_funcsig == NULL) {
3164                         const source_position_t *const src_pos = &expr->base.source_position;
3165                         ir_entity *ent = get_irg_entity(current_ir_graph);
3166                         const char *const name = get_entity_ld_name(ent);
3167                         const string_t string = { name, strlen(name) + 1 };
3168                         current_funcsig = string_to_firm(src_pos, "__FUNCSIG__.%u", &string);
3169                 }
3170                 return current_funcsig;
3171         }
3172         panic("Unsupported function name");
3173 }
3174
3175 static ir_node *statement_expression_to_firm(const statement_expression_t *expr)
3176 {
3177         statement_t *statement = expr->statement;
3178
3179         assert(statement->kind == STATEMENT_COMPOUND);
3180         return compound_statement_to_firm(&statement->compound);
3181 }
3182
3183 static ir_node *va_start_expression_to_firm(
3184         const va_start_expression_t *const expr)
3185 {
3186         ir_entity *param_ent = current_vararg_entity;
3187         if (param_ent == NULL) {
3188                 size_t   const n           = IR_VA_START_PARAMETER_NUMBER;
3189                 ir_type *const frame_type  = get_irg_frame_type(current_ir_graph);
3190                 ir_type *const param_type  = get_unknown_type();
3191                 param_ent = new_parameter_entity(frame_type, n, param_type);
3192                 current_vararg_entity = param_ent;
3193         }
3194
3195         ir_node  *const frame   = get_irg_frame(current_ir_graph);
3196         dbg_info *const dbgi    = get_dbg_info(&expr->base.source_position);
3197         ir_node  *const no_mem  = new_NoMem();
3198         ir_node  *const arg_sel = new_d_simpleSel(dbgi, no_mem, frame, param_ent);
3199
3200         set_value_for_expression(expr->ap, arg_sel);
3201
3202         return NULL;
3203 }
3204
3205 static ir_node *va_arg_expression_to_firm(const va_arg_expression_t *const expr)
3206 {
3207         type_t       *const type    = expr->base.type;
3208         expression_t *const ap_expr = expr->ap;
3209         ir_node      *const ap_addr = expression_to_addr(ap_expr);
3210         ir_node      *const ap      = get_value_from_lvalue(ap_expr, ap_addr);
3211         dbg_info     *const dbgi    = get_dbg_info(&expr->base.source_position);
3212         ir_node      *const res     = deref_address(dbgi, type, ap);
3213
3214         ir_node      *const cnst    = get_type_size_node(expr->base.type);
3215         ir_mode      *const mode    = get_irn_mode(cnst);
3216         ir_node      *const c1      = new_Const_long(mode, stack_param_align - 1);
3217         ir_node      *const c2      = new_d_Add(dbgi, cnst, c1, mode);
3218         ir_node      *const c3      = new_Const_long(mode, -(long)stack_param_align);
3219         ir_node      *const c4      = new_d_And(dbgi, c2, c3, mode);
3220         ir_node      *const add     = new_d_Add(dbgi, ap, c4, mode_P_data);
3221
3222         set_value_for_expression_addr(ap_expr, add, ap_addr);
3223
3224         return res;
3225 }
3226
3227 /**
3228  * Generate Firm for a va_copy expression.
3229  */
3230 static ir_node *va_copy_expression_to_firm(const va_copy_expression_t *const expr)
3231 {
3232         ir_node *const src = expression_to_firm(expr->src);
3233         set_value_for_expression(expr->dst, src);
3234         return NULL;
3235 }
3236
3237 static ir_node *dereference_addr(const unary_expression_t *const expression)
3238 {
3239         assert(expression->base.kind == EXPR_UNARY_DEREFERENCE);
3240         return expression_to_firm(expression->value);
3241 }
3242
3243 /**
3244  * Returns a IR-node representing an lvalue of the given expression.
3245  */
3246 static ir_node *expression_to_addr(const expression_t *expression)
3247 {
3248         switch(expression->kind) {
3249         case EXPR_ARRAY_ACCESS:
3250                 return array_access_addr(&expression->array_access);
3251         case EXPR_CALL:
3252                 return call_expression_to_firm(&expression->call);
3253         case EXPR_COMPOUND_LITERAL:
3254                 return compound_literal_addr(&expression->compound_literal);
3255         case EXPR_REFERENCE:
3256                 return reference_addr(&expression->reference);
3257         case EXPR_SELECT:
3258                 return select_addr(&expression->select);
3259         case EXPR_UNARY_DEREFERENCE:
3260                 return dereference_addr(&expression->unary);
3261         default:
3262                 break;
3263         }
3264         panic("trying to get address of non-lvalue");
3265 }
3266
3267 static ir_node *builtin_constant_to_firm(
3268                 const builtin_constant_expression_t *expression)
3269 {
3270         ir_mode *const mode = get_ir_mode_arithmetic(expression->base.type);
3271         bool     const v    = is_constant_expression(expression->value) == EXPR_CLASS_CONSTANT;
3272         return create_Const_from_bool(mode, v);
3273 }
3274
3275 static ir_node *builtin_types_compatible_to_firm(
3276                 const builtin_types_compatible_expression_t *expression)
3277 {
3278         type_t  *const left  = get_unqualified_type(skip_typeref(expression->left));
3279         type_t  *const right = get_unqualified_type(skip_typeref(expression->right));
3280         bool     const value = types_compatible(left, right);
3281         ir_mode *const mode  = get_ir_mode_arithmetic(expression->base.type);
3282         return create_Const_from_bool(mode, value);
3283 }
3284
3285 static ir_node *get_label_block(label_t *label)
3286 {
3287         if (label->block != NULL)
3288                 return label->block;
3289
3290         /* beware: might be called from create initializer with current_ir_graph
3291          * set to const_code_irg. */
3292         ir_graph *rem    = current_ir_graph;
3293         current_ir_graph = current_function;
3294
3295         ir_node *block = new_immBlock();
3296
3297         label->block = block;
3298
3299         ARR_APP1(label_t *, all_labels, label);
3300
3301         current_ir_graph = rem;
3302         return block;
3303 }
3304
3305 /**
3306  * Pointer to a label.  This is used for the
3307  * GNU address-of-label extension.
3308  */
3309 static ir_node *label_address_to_firm(const label_address_expression_t *label)
3310 {
3311         dbg_info  *dbgi   = get_dbg_info(&label->base.source_position);
3312         ir_node   *block  = get_label_block(label->label);
3313         ir_entity *entity = create_Block_entity(block);
3314
3315         symconst_symbol value;
3316         value.entity_p = entity;
3317         return new_d_SymConst(dbgi, mode_P_code, value, symconst_addr_ent);
3318 }
3319
3320 /**
3321  * creates firm nodes for an expression. The difference between this function
3322  * and expression_to_firm is, that this version might produce mode_b nodes
3323  * instead of mode_Is.
3324  */
3325 static ir_node *_expression_to_firm(expression_t const *const expr)
3326 {
3327 #ifndef NDEBUG
3328         if (!constant_folding) {
3329                 assert(!expr->base.transformed);
3330                 ((expression_t*)expr)->base.transformed = true;
3331         }
3332 #endif
3333
3334         switch (expr->kind) {
3335         case EXPR_ALIGNOF:                    return alignof_to_firm(                 &expr->typeprop);
3336         case EXPR_ARRAY_ACCESS:               return array_access_to_firm(            &expr->array_access);
3337         case EXPR_BINARY_CASES:               return binary_expression_to_firm(       &expr->binary);
3338         case EXPR_BUILTIN_CONSTANT_P:         return builtin_constant_to_firm(        &expr->builtin_constant);
3339         case EXPR_BUILTIN_TYPES_COMPATIBLE_P: return builtin_types_compatible_to_firm(&expr->builtin_types_compatible);
3340         case EXPR_CALL:                       return call_expression_to_firm(         &expr->call);
3341         case EXPR_CLASSIFY_TYPE:              return classify_type_to_firm(           &expr->classify_type);
3342         case EXPR_COMPOUND_LITERAL:           return compound_literal_to_firm(        &expr->compound_literal);
3343         case EXPR_CONDITIONAL:                return conditional_to_firm(             &expr->conditional);
3344         case EXPR_FUNCNAME:                   return function_name_to_firm(           &expr->funcname);
3345         case EXPR_LABEL_ADDRESS:              return label_address_to_firm(           &expr->label_address);
3346         case EXPR_LITERAL_CASES:              return literal_to_firm(                 &expr->literal);
3347         case EXPR_OFFSETOF:                   return offsetof_to_firm(                &expr->offsetofe);
3348         case EXPR_REFERENCE:                  return reference_expression_to_firm(    &expr->reference);
3349         case EXPR_ENUM_CONSTANT:              return enum_constant_to_firm(           &expr->reference);
3350         case EXPR_SELECT:                     return select_to_firm(                  &expr->select);
3351         case EXPR_SIZEOF:                     return sizeof_to_firm(                  &expr->typeprop);
3352         case EXPR_STATEMENT:                  return statement_expression_to_firm(    &expr->statement);
3353         case EXPR_UNARY_CASES:                return unary_expression_to_firm(        &expr->unary);
3354         case EXPR_VA_ARG:                     return va_arg_expression_to_firm(       &expr->va_arge);
3355         case EXPR_VA_COPY:                    return va_copy_expression_to_firm(      &expr->va_copye);
3356         case EXPR_VA_START:                   return va_start_expression_to_firm(     &expr->va_starte);
3357         case EXPR_WIDE_STRING_LITERAL:        return wide_string_literal_to_firm(     &expr->string_literal);
3358
3359         case EXPR_STRING_LITERAL: return string_to_firm(&expr->base.source_position, "str.%u", &expr->string_literal.value);
3360
3361         case EXPR_ERROR: break;
3362         }
3363         panic("invalid expression found");
3364 }
3365
3366 /**
3367  * Check if a given expression is a GNU __builtin_expect() call.
3368  */
3369 static bool is_builtin_expect(const expression_t *expression)
3370 {
3371         if (expression->kind != EXPR_CALL)
3372                 return false;
3373
3374         expression_t *function = expression->call.function;
3375         if (function->kind != EXPR_REFERENCE)
3376                 return false;
3377         reference_expression_t *ref = &function->reference;
3378         if (ref->entity->kind         != ENTITY_FUNCTION ||
3379             ref->entity->function.btk != BUILTIN_EXPECT)
3380                 return false;
3381
3382         return true;
3383 }
3384
3385 static bool produces_mode_b(const expression_t *expression)
3386 {
3387         switch (expression->kind) {
3388         case EXPR_BINARY_EQUAL:
3389         case EXPR_BINARY_NOTEQUAL:
3390         case EXPR_BINARY_LESS:
3391         case EXPR_BINARY_LESSEQUAL:
3392         case EXPR_BINARY_GREATER:
3393         case EXPR_BINARY_GREATEREQUAL:
3394         case EXPR_BINARY_ISGREATER:
3395         case EXPR_BINARY_ISGREATEREQUAL:
3396         case EXPR_BINARY_ISLESS:
3397         case EXPR_BINARY_ISLESSEQUAL:
3398         case EXPR_BINARY_ISLESSGREATER:
3399         case EXPR_BINARY_ISUNORDERED:
3400         case EXPR_UNARY_NOT:
3401                 return true;
3402
3403         case EXPR_CALL:
3404                 if (is_builtin_expect(expression)) {
3405                         expression_t *argument = expression->call.arguments->expression;
3406                         return produces_mode_b(argument);
3407                 }
3408                 return false;
3409         case EXPR_BINARY_COMMA:
3410                 return produces_mode_b(expression->binary.right);
3411
3412         default:
3413                 return false;
3414         }
3415 }
3416
3417 static ir_node *expression_to_firm(const expression_t *expression)
3418 {
3419         if (!produces_mode_b(expression)) {
3420                 ir_node *res = _expression_to_firm(expression);
3421                 assert(res == NULL || get_irn_mode(res) != mode_b);
3422                 return res;
3423         }
3424
3425         if (is_constant_expression(expression) == EXPR_CLASS_CONSTANT) {
3426                 return new_Const(fold_constant_to_tarval(expression));
3427         }
3428
3429         /* we have to produce a 0/1 from the mode_b expression */
3430         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3431         ir_mode  *mode = get_ir_mode_arithmetic(expression->base.type);
3432         return produce_condition_result(expression, mode, dbgi);
3433 }
3434
3435 /**
3436  * create a short-circuit expression evaluation that tries to construct
3437  * efficient control flow structures for &&, || and ! expressions
3438  */
3439 static ir_node *create_condition_evaluation(const expression_t *expression,
3440                                             ir_node *true_block,
3441                                             ir_node *false_block)
3442 {
3443         switch(expression->kind) {
3444         case EXPR_UNARY_NOT: {
3445                 const unary_expression_t *unary_expression = &expression->unary;
3446                 create_condition_evaluation(unary_expression->value, false_block,
3447                                             true_block);
3448                 return NULL;
3449         }
3450         case EXPR_BINARY_LOGICAL_AND: {
3451                 const binary_expression_t *binary_expression = &expression->binary;
3452
3453                 ir_node *extra_block = new_immBlock();
3454                 create_condition_evaluation(binary_expression->left, extra_block,
3455                                             false_block);
3456                 mature_immBlock(extra_block);
3457                 set_cur_block(extra_block);
3458                 create_condition_evaluation(binary_expression->right, true_block,
3459                                             false_block);
3460                 return NULL;
3461         }
3462         case EXPR_BINARY_LOGICAL_OR: {
3463                 const binary_expression_t *binary_expression = &expression->binary;
3464
3465                 ir_node *extra_block = new_immBlock();
3466                 create_condition_evaluation(binary_expression->left, true_block,
3467                                             extra_block);
3468                 mature_immBlock(extra_block);
3469                 set_cur_block(extra_block);
3470                 create_condition_evaluation(binary_expression->right, true_block,
3471                                             false_block);
3472                 return NULL;
3473         }
3474         default:
3475                 break;
3476         }
3477
3478         dbg_info *dbgi       = get_dbg_info(&expression->base.source_position);
3479         ir_node  *cond_expr  = _expression_to_firm(expression);
3480         ir_node  *condition  = create_conv(dbgi, cond_expr, mode_b);
3481         ir_node  *cond       = new_d_Cond(dbgi, condition);
3482         ir_node  *true_proj  = new_d_Proj(dbgi, cond, mode_X, pn_Cond_true);
3483         ir_node  *false_proj = new_d_Proj(dbgi, cond, mode_X, pn_Cond_false);
3484
3485         /* set branch prediction info based on __builtin_expect */
3486         if (is_builtin_expect(expression) && is_Cond(cond)) {
3487                 call_argument_t *argument = expression->call.arguments->next;
3488                 if (is_constant_expression(argument->expression) == EXPR_CLASS_CONSTANT) {
3489                         bool               const cnst = fold_constant_to_bool(argument->expression);
3490                         cond_jmp_predicate const pred = cnst ? COND_JMP_PRED_TRUE : COND_JMP_PRED_FALSE;
3491                         set_Cond_jmp_pred(cond, pred);
3492                 }
3493         }
3494
3495         add_immBlock_pred(true_block, true_proj);
3496         add_immBlock_pred(false_block, false_proj);
3497
3498         set_unreachable_now();
3499         return cond_expr;
3500 }
3501
3502 static void create_variable_entity(entity_t *variable,
3503                                    declaration_kind_t declaration_kind,
3504                                    ir_type *parent_type)
3505 {
3506         assert(variable->kind == ENTITY_VARIABLE);
3507         type_t    *type = skip_typeref(variable->declaration.type);
3508
3509         ident     *const id        = new_id_from_str(variable->base.symbol->string);
3510         ir_type   *const irtype    = get_ir_type(type);
3511         dbg_info  *const dbgi      = get_dbg_info(&variable->base.source_position);
3512         ir_entity *const irentity  = new_d_entity(parent_type, id, irtype, dbgi);
3513         unsigned         alignment = variable->declaration.alignment;
3514
3515         set_entity_alignment(irentity, alignment);
3516
3517         handle_decl_modifiers(irentity, variable);
3518
3519         variable->declaration.kind  = (unsigned char) declaration_kind;
3520         variable->variable.v.entity = irentity;
3521         set_entity_ld_ident(irentity, create_ld_ident(variable));
3522
3523         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
3524                 set_entity_volatility(irentity, volatility_is_volatile);
3525         }
3526 }
3527
3528
3529 typedef struct type_path_entry_t type_path_entry_t;
3530 struct type_path_entry_t {
3531         type_t           *type;
3532         ir_initializer_t *initializer;
3533         size_t            index;
3534         entity_t         *compound_entry;
3535 };
3536
3537 typedef struct type_path_t type_path_t;
3538 struct type_path_t {
3539         type_path_entry_t *path;
3540         type_t            *top_type;
3541         bool               invalid;
3542 };
3543
3544 static __attribute__((unused)) void debug_print_type_path(const type_path_t *path)
3545 {
3546         size_t len = ARR_LEN(path->path);
3547
3548         for (size_t i = 0; i < len; ++i) {
3549                 const type_path_entry_t *entry = & path->path[i];
3550
3551                 type_t *type = skip_typeref(entry->type);
3552                 if (is_type_compound(type)) {
3553                         fprintf(stderr, ".%s", entry->compound_entry->base.symbol->string);
3554                 } else if (is_type_array(type)) {
3555                         fprintf(stderr, "[%u]", (unsigned) entry->index);
3556                 } else {
3557                         fprintf(stderr, "-INVALID-");
3558                 }
3559         }
3560         fprintf(stderr, "  (");
3561         print_type(path->top_type);
3562         fprintf(stderr, ")");
3563 }
3564
3565 static type_path_entry_t *get_type_path_top(const type_path_t *path)
3566 {
3567         size_t len = ARR_LEN(path->path);
3568         assert(len > 0);
3569         return & path->path[len-1];
3570 }
3571
3572 static type_path_entry_t *append_to_type_path(type_path_t *path)
3573 {
3574         size_t len = ARR_LEN(path->path);
3575         ARR_RESIZE(type_path_entry_t, path->path, len+1);
3576
3577         type_path_entry_t *result = & path->path[len];
3578         memset(result, 0, sizeof(result[0]));
3579         return result;
3580 }
3581
3582 static size_t get_compound_member_count(const compound_type_t *type)
3583 {
3584         compound_t *compound  = type->compound;
3585         size_t      n_members = 0;
3586         entity_t   *member    = compound->members.entities;
3587         for ( ; member != NULL; member = member->base.next) {
3588                 ++n_members;
3589         }
3590
3591         return n_members;
3592 }
3593
3594 static ir_initializer_t *get_initializer_entry(type_path_t *path)
3595 {
3596         type_t *orig_top_type = path->top_type;
3597         type_t *top_type      = skip_typeref(orig_top_type);
3598
3599         assert(is_type_compound(top_type) || is_type_array(top_type));
3600
3601         if (ARR_LEN(path->path) == 0) {
3602                 return NULL;
3603         } else {
3604                 type_path_entry_t *top         = get_type_path_top(path);
3605                 ir_initializer_t  *initializer = top->initializer;
3606                 return get_initializer_compound_value(initializer, top->index);
3607         }
3608 }
3609
3610 static void descend_into_subtype(type_path_t *path)
3611 {
3612         type_t *orig_top_type = path->top_type;
3613         type_t *top_type      = skip_typeref(orig_top_type);
3614
3615         assert(is_type_compound(top_type) || is_type_array(top_type));
3616
3617         ir_initializer_t *initializer = get_initializer_entry(path);
3618
3619         type_path_entry_t *top = append_to_type_path(path);
3620         top->type              = top_type;
3621
3622         size_t len;
3623
3624         if (is_type_compound(top_type)) {
3625                 compound_t *const compound = top_type->compound.compound;
3626                 entity_t   *const entry    = skip_unnamed_bitfields(compound->members.entities);
3627
3628                 top->compound_entry = entry;
3629                 top->index          = 0;
3630                 len                 = get_compound_member_count(&top_type->compound);
3631                 if (entry != NULL) {
3632                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3633                         path->top_type = entry->declaration.type;
3634                 }
3635         } else {
3636                 assert(is_type_array(top_type));
3637                 assert(top_type->array.size > 0);
3638
3639                 top->index     = 0;
3640                 path->top_type = top_type->array.element_type;
3641                 len            = top_type->array.size;
3642         }
3643         if (initializer == NULL
3644                         || get_initializer_kind(initializer) == IR_INITIALIZER_NULL) {
3645                 initializer = create_initializer_compound(len);
3646                 /* we have to set the entry at the 2nd latest path entry... */
3647                 size_t path_len = ARR_LEN(path->path);
3648                 assert(path_len >= 1);
3649                 if (path_len > 1) {
3650                         type_path_entry_t *entry        = & path->path[path_len-2];
3651                         ir_initializer_t  *tinitializer = entry->initializer;
3652                         set_initializer_compound_value(tinitializer, entry->index,
3653                                                        initializer);
3654                 }
3655         }
3656         top->initializer = initializer;
3657 }
3658
3659 static void ascend_from_subtype(type_path_t *path)
3660 {
3661         type_path_entry_t *top = get_type_path_top(path);
3662
3663         path->top_type = top->type;
3664
3665         size_t len = ARR_LEN(path->path);
3666         ARR_RESIZE(type_path_entry_t, path->path, len-1);
3667 }
3668
3669 static void walk_designator(type_path_t *path, const designator_t *designator)
3670 {
3671         /* designators start at current object type */
3672         ARR_RESIZE(type_path_entry_t, path->path, 1);
3673
3674         for ( ; designator != NULL; designator = designator->next) {
3675                 type_path_entry_t *top         = get_type_path_top(path);
3676                 type_t            *orig_type   = top->type;
3677                 type_t            *type        = skip_typeref(orig_type);
3678
3679                 if (designator->symbol != NULL) {
3680                         assert(is_type_compound(type));
3681                         size_t    index  = 0;
3682                         symbol_t *symbol = designator->symbol;
3683
3684                         compound_t *compound = type->compound.compound;
3685                         entity_t   *iter     = compound->members.entities;
3686                         for ( ; iter != NULL; iter = iter->base.next, ++index) {
3687                                 if (iter->base.symbol == symbol) {
3688                                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
3689                                         break;
3690                                 }
3691                         }
3692                         assert(iter != NULL);
3693
3694                         /* revert previous initialisations of other union elements */
3695                         if (type->kind == TYPE_COMPOUND_UNION) {
3696                                 ir_initializer_t *initializer = top->initializer;
3697                                 if (initializer != NULL
3698                                         && get_initializer_kind(initializer) == IR_INITIALIZER_COMPOUND) {
3699                                         /* are we writing to a new element? */
3700                                         ir_initializer_t *oldi
3701                                                 = get_initializer_compound_value(initializer, index);
3702                                         if (get_initializer_kind(oldi) == IR_INITIALIZER_NULL) {
3703                                                 /* clear initializer */
3704                                                 size_t len
3705                                                         = get_initializer_compound_n_entries(initializer);
3706                                                 ir_initializer_t *nulli = get_initializer_null();
3707                                                 for (size_t i = 0; i < len; ++i) {
3708                                                         set_initializer_compound_value(initializer, i,
3709                                                                                        nulli);
3710                                                 }
3711                                         }
3712                                 }
3713                         }
3714
3715                         top->type           = orig_type;
3716                         top->compound_entry = iter;
3717                         top->index          = index;
3718                         orig_type           = iter->declaration.type;
3719                 } else {
3720                         expression_t *array_index = designator->array_index;
3721                         assert(designator->array_index != NULL);
3722                         assert(is_type_array(type));
3723
3724                         long index = fold_constant_to_int(array_index);
3725                         assert(index >= 0);
3726 #ifndef NDEBUG
3727                         if (type->array.size_constant) {
3728                                 long array_size = type->array.size;
3729                                 assert(index < array_size);
3730                         }
3731 #endif
3732
3733                         top->type  = orig_type;
3734                         top->index = (size_t) index;
3735                         orig_type  = type->array.element_type;
3736                 }
3737                 path->top_type = orig_type;
3738
3739                 if (designator->next != NULL) {
3740                         descend_into_subtype(path);
3741                 }
3742         }
3743
3744         path->invalid  = false;
3745 }
3746
3747 static void advance_current_object(type_path_t *path)
3748 {
3749         if (path->invalid) {
3750                 /* TODO: handle this... */
3751                 panic("invalid initializer in ast2firm (excessive elements)");
3752         }
3753
3754         type_path_entry_t *top = get_type_path_top(path);
3755
3756         type_t *type = skip_typeref(top->type);
3757         if (is_type_union(type)) {
3758                 /* only the first element is initialized in unions */
3759                 top->compound_entry = NULL;
3760         } else if (is_type_struct(type)) {
3761                 entity_t *entry = top->compound_entry;
3762
3763                 top->index++;
3764                 entry               = skip_unnamed_bitfields(entry->base.next);
3765                 top->compound_entry = entry;
3766                 if (entry != NULL) {
3767                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3768                         path->top_type = entry->declaration.type;
3769                         return;
3770                 }
3771         } else {
3772                 assert(is_type_array(type));
3773
3774                 top->index++;
3775                 if (!type->array.size_constant || top->index < type->array.size) {
3776                         return;
3777                 }
3778         }
3779
3780         /* we're past the last member of the current sub-aggregate, try if we
3781          * can ascend in the type hierarchy and continue with another subobject */
3782         size_t len = ARR_LEN(path->path);
3783
3784         if (len > 1) {
3785                 ascend_from_subtype(path);
3786                 advance_current_object(path);
3787         } else {
3788                 path->invalid = true;
3789         }
3790 }
3791
3792
3793 static ir_initializer_t *create_ir_initializer_value(
3794                 const initializer_value_t *initializer)
3795 {
3796         if (is_type_compound(initializer->value->base.type)) {
3797                 panic("initializer creation for compounds not implemented yet");
3798         }
3799         type_t       *type = initializer->value->base.type;
3800         expression_t *expr = initializer->value;
3801         ir_node *value = expression_to_firm(expr);
3802         ir_mode *mode  = get_ir_mode_storage(type);
3803         value          = create_conv(NULL, value, mode);
3804         return create_initializer_const(value);
3805 }
3806
3807 /** test wether type can be initialized by a string constant */
3808 static bool is_string_type(type_t *type)
3809 {
3810         type_t *inner;
3811         if (is_type_pointer(type)) {
3812                 inner = skip_typeref(type->pointer.points_to);
3813         } else if(is_type_array(type)) {
3814                 inner = skip_typeref(type->array.element_type);
3815         } else {
3816                 return false;
3817         }
3818
3819         return is_type_integer(inner);
3820 }
3821
3822 static ir_initializer_t *create_ir_initializer_list(
3823                 const initializer_list_t *initializer, type_t *type)
3824 {
3825         type_path_t path;
3826         memset(&path, 0, sizeof(path));
3827         path.top_type = type;
3828         path.path     = NEW_ARR_F(type_path_entry_t, 0);
3829
3830         descend_into_subtype(&path);
3831
3832         for (size_t i = 0; i < initializer->len; ++i) {
3833                 const initializer_t *sub_initializer = initializer->initializers[i];
3834
3835                 if (sub_initializer->kind == INITIALIZER_DESIGNATOR) {
3836                         walk_designator(&path, sub_initializer->designator.designator);
3837                         continue;
3838                 }
3839
3840                 if (sub_initializer->kind == INITIALIZER_VALUE) {
3841                         /* we might have to descend into types until we're at a scalar
3842                          * type */
3843                         while(true) {
3844                                 type_t *orig_top_type = path.top_type;
3845                                 type_t *top_type      = skip_typeref(orig_top_type);
3846
3847                                 if (is_type_scalar(top_type))
3848                                         break;
3849                                 descend_into_subtype(&path);
3850                         }
3851                 } else if (sub_initializer->kind == INITIALIZER_STRING
3852                                 || sub_initializer->kind == INITIALIZER_WIDE_STRING) {
3853                         /* we might have to descend into types until we're at a scalar
3854                          * type */
3855                         while (true) {
3856                                 type_t *orig_top_type = path.top_type;
3857                                 type_t *top_type      = skip_typeref(orig_top_type);
3858
3859                                 if (is_string_type(top_type))
3860                                         break;
3861                                 descend_into_subtype(&path);
3862                         }
3863                 }
3864
3865                 ir_initializer_t *sub_irinitializer
3866                         = create_ir_initializer(sub_initializer, path.top_type);
3867
3868                 size_t path_len = ARR_LEN(path.path);
3869                 assert(path_len >= 1);
3870                 type_path_entry_t *entry        = & path.path[path_len-1];
3871                 ir_initializer_t  *tinitializer = entry->initializer;
3872                 set_initializer_compound_value(tinitializer, entry->index,
3873                                                sub_irinitializer);
3874
3875                 advance_current_object(&path);
3876         }
3877
3878         assert(ARR_LEN(path.path) >= 1);
3879         ir_initializer_t *result = path.path[0].initializer;
3880         DEL_ARR_F(path.path);
3881
3882         return result;
3883 }
3884
3885 static ir_initializer_t *create_ir_initializer_string(
3886                 const initializer_string_t *initializer, type_t *type)
3887 {
3888         type = skip_typeref(type);
3889
3890         size_t            string_len    = initializer->string.size;
3891         assert(type->kind == TYPE_ARRAY);
3892         assert(type->array.size_constant);
3893         size_t            len           = type->array.size;
3894         ir_initializer_t *irinitializer = create_initializer_compound(len);
3895
3896         const char *string = initializer->string.begin;
3897         ir_mode    *mode   = get_ir_mode_storage(type->array.element_type);
3898
3899         for (size_t i = 0; i < len; ++i) {
3900                 char c = 0;
3901                 if (i < string_len)
3902                         c = string[i];
3903
3904                 ir_tarval        *tv = new_tarval_from_long(c, mode);
3905                 ir_initializer_t *char_initializer = create_initializer_tarval(tv);
3906
3907                 set_initializer_compound_value(irinitializer, i, char_initializer);
3908         }
3909
3910         return irinitializer;
3911 }
3912
3913 static ir_initializer_t *create_ir_initializer_wide_string(
3914                 const initializer_wide_string_t *initializer, type_t *type)
3915 {
3916         assert(type->kind == TYPE_ARRAY);
3917         assert(type->array.size_constant);
3918         size_t            len           = type->array.size;
3919         size_t            string_len    = wstrlen(&initializer->string);
3920         ir_initializer_t *irinitializer = create_initializer_compound(len);
3921
3922         const char *p    = initializer->string.begin;
3923         ir_mode    *mode = get_type_mode(ir_type_wchar_t);
3924
3925         for (size_t i = 0; i < len; ++i) {
3926                 utf32 c = 0;
3927                 if (i < string_len) {
3928                         c = read_utf8_char(&p);
3929                 }
3930                 ir_tarval *tv = new_tarval_from_long(c, mode);
3931                 ir_initializer_t *char_initializer = create_initializer_tarval(tv);
3932
3933                 set_initializer_compound_value(irinitializer, i, char_initializer);
3934         }
3935
3936         return irinitializer;
3937 }
3938
3939 static ir_initializer_t *create_ir_initializer(
3940                 const initializer_t *initializer, type_t *type)
3941 {
3942         switch(initializer->kind) {
3943                 case INITIALIZER_STRING:
3944                         return create_ir_initializer_string(&initializer->string, type);
3945
3946                 case INITIALIZER_WIDE_STRING:
3947                         return create_ir_initializer_wide_string(&initializer->wide_string,
3948                                                                  type);
3949
3950                 case INITIALIZER_LIST:
3951                         return create_ir_initializer_list(&initializer->list, type);
3952
3953                 case INITIALIZER_VALUE:
3954                         return create_ir_initializer_value(&initializer->value);
3955
3956                 case INITIALIZER_DESIGNATOR:
3957                         panic("unexpected designator initializer found");
3958         }
3959         panic("unknown initializer");
3960 }
3961
3962 /** ANSI C §6.7.8:21: If there are fewer initializers [..] than there
3963  *  are elements [...] the remainder of the aggregate shall be initialized
3964  *  implicitly the same as objects that have static storage duration. */
3965 static void create_dynamic_null_initializer(ir_entity *entity, dbg_info *dbgi,
3966                 ir_node *base_addr)
3967 {
3968         /* for unions we must NOT do anything for null initializers */
3969         ir_type *owner = get_entity_owner(entity);
3970         if (is_Union_type(owner)) {
3971                 return;
3972         }
3973
3974         ir_type *ent_type = get_entity_type(entity);
3975         /* create sub-initializers for a compound type */
3976         if (is_compound_type(ent_type)) {
3977                 unsigned n_members = get_compound_n_members(ent_type);
3978                 for (unsigned n = 0; n < n_members; ++n) {
3979                         ir_entity *member = get_compound_member(ent_type, n);
3980                         ir_node   *addr   = new_d_simpleSel(dbgi, new_NoMem(), base_addr,
3981                                                                 member);
3982                         create_dynamic_null_initializer(member, dbgi, addr);
3983                 }
3984                 return;
3985         }
3986         if (is_Array_type(ent_type)) {
3987                 assert(has_array_upper_bound(ent_type, 0));
3988                 long n = get_array_upper_bound_int(ent_type, 0);
3989                 for (long i = 0; i < n; ++i) {
3990                         ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
3991                         ir_tarval *index_tv = new_tarval_from_long(i, mode_uint);
3992                         ir_node   *cnst     = new_d_Const(dbgi, index_tv);
3993                         ir_node   *in[1]    = { cnst };
3994                         ir_entity *arrent   = get_array_element_entity(ent_type);
3995                         ir_node   *addr     = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in,
3996                                                         arrent);
3997                         create_dynamic_null_initializer(arrent, dbgi, addr);
3998                 }
3999                 return;
4000         }
4001
4002         ir_mode *value_mode = get_type_mode(ent_type);
4003         ir_node *node       = new_Const(get_mode_null(value_mode));
4004
4005         /* is it a bitfield type? */
4006         if (is_Primitive_type(ent_type) &&
4007                         get_primitive_base_type(ent_type) != NULL) {
4008                 bitfield_store_to_firm(dbgi, entity, base_addr, node, false, false);
4009                 return;
4010         }
4011
4012         ir_node *mem    = get_store();
4013         ir_node *store  = new_d_Store(dbgi, mem, base_addr, node, cons_none);
4014         ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4015         set_store(proj_m);
4016 }
4017
4018 static void create_dynamic_initializer_sub(ir_initializer_t *initializer,
4019                 ir_entity *entity, ir_type *type, dbg_info *dbgi, ir_node *base_addr)
4020 {
4021         switch(get_initializer_kind(initializer)) {
4022         case IR_INITIALIZER_NULL:
4023                 create_dynamic_null_initializer(entity, dbgi, base_addr);
4024                 return;
4025         case IR_INITIALIZER_CONST: {
4026                 ir_node *node     = get_initializer_const_value(initializer);
4027                 ir_type *ent_type = get_entity_type(entity);
4028
4029                 /* is it a bitfield type? */
4030                 if (is_Primitive_type(ent_type) &&
4031                                 get_primitive_base_type(ent_type) != NULL) {
4032                         bitfield_store_to_firm(dbgi, entity, base_addr, node, false, false);
4033                         return;
4034                 }
4035
4036                 assert(get_type_mode(type) == get_irn_mode(node));
4037                 ir_node *mem    = get_store();
4038                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, node, cons_none);
4039                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4040                 set_store(proj_m);
4041                 return;
4042         }
4043         case IR_INITIALIZER_TARVAL: {
4044                 ir_tarval *tv       = get_initializer_tarval_value(initializer);
4045                 ir_node   *cnst     = new_d_Const(dbgi, tv);
4046                 ir_type   *ent_type = get_entity_type(entity);
4047
4048                 /* is it a bitfield type? */
4049                 if (is_Primitive_type(ent_type) &&
4050                                 get_primitive_base_type(ent_type) != NULL) {
4051                         bitfield_store_to_firm(dbgi, entity, base_addr, cnst, false, false);
4052                         return;
4053                 }
4054
4055                 assert(get_type_mode(type) == get_tarval_mode(tv));
4056                 ir_node *mem    = get_store();
4057                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, cnst, cons_none);
4058                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4059                 set_store(proj_m);
4060                 return;
4061         }
4062         case IR_INITIALIZER_COMPOUND: {
4063                 assert(is_compound_type(type) || is_Array_type(type));
4064                 int n_members;
4065                 if (is_Array_type(type)) {
4066                         assert(has_array_upper_bound(type, 0));
4067                         n_members = get_array_upper_bound_int(type, 0);
4068                 } else {
4069                         n_members = get_compound_n_members(type);
4070                 }
4071
4072                 if (get_initializer_compound_n_entries(initializer)
4073                                 != (unsigned) n_members)
4074                         panic("initializer doesn't match compound type");
4075
4076                 for (int i = 0; i < n_members; ++i) {
4077                         ir_node   *addr;
4078                         ir_type   *irtype;
4079                         ir_entity *sub_entity;
4080                         if (is_Array_type(type)) {
4081                                 ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
4082                                 ir_tarval *index_tv = new_tarval_from_long(i, mode_uint);
4083                                 ir_node   *cnst     = new_d_Const(dbgi, index_tv);
4084                                 ir_node   *in[1]    = { cnst };
4085                                 irtype     = get_array_element_type(type);
4086                                 sub_entity = get_array_element_entity(type);
4087                                 addr       = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in,
4088                                                        sub_entity);
4089                         } else {
4090                                 sub_entity = get_compound_member(type, i);
4091                                 irtype     = get_entity_type(sub_entity);
4092                                 addr       = new_d_simpleSel(dbgi, new_NoMem(), base_addr,
4093                                                              sub_entity);
4094                         }
4095
4096                         ir_initializer_t *sub_init
4097                                 = get_initializer_compound_value(initializer, i);
4098
4099                         create_dynamic_initializer_sub(sub_init, sub_entity, irtype, dbgi,
4100                                                        addr);
4101                 }
4102                 return;
4103         }
4104         }
4105
4106         panic("invalid IR_INITIALIZER found");
4107 }
4108
4109 static void create_dynamic_initializer(ir_initializer_t *initializer,
4110                 dbg_info *dbgi, ir_entity *entity)
4111 {
4112         ir_node *frame     = get_irg_frame(current_ir_graph);
4113         ir_node *base_addr = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
4114         ir_type *type      = get_entity_type(entity);
4115
4116         create_dynamic_initializer_sub(initializer, entity, type, dbgi, base_addr);
4117 }
4118
4119 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
4120                                      ir_entity *entity, type_t *type)
4121 {
4122         ir_node *memory = get_store();
4123         ir_node *nomem  = new_NoMem();
4124         ir_node *frame  = get_irg_frame(current_ir_graph);
4125         ir_node *addr   = new_d_simpleSel(dbgi, nomem, frame, entity);
4126
4127         if (initializer->kind == INITIALIZER_VALUE) {
4128                 initializer_value_t *initializer_value = &initializer->value;
4129
4130                 ir_node *value = expression_to_firm(initializer_value->value);
4131                 type = skip_typeref(type);
4132                 assign_value(dbgi, addr, type, value);
4133                 return;
4134         }
4135
4136         if (is_constant_initializer(initializer) == EXPR_CLASS_VARIABLE) {
4137                 ir_initializer_t *irinitializer
4138                         = create_ir_initializer(initializer, type);
4139
4140                 create_dynamic_initializer(irinitializer, dbgi, entity);
4141                 return;
4142         }
4143
4144         /* create a "template" entity which is copied to the entity on the stack */
4145         ir_entity *const init_entity
4146                 = create_initializer_entity(dbgi, initializer, type);
4147         ir_node *const src_addr = create_symconst(dbgi, init_entity);
4148         ir_type *const irtype   = get_ir_type(type);
4149         ir_node *const copyb    = new_d_CopyB(dbgi, memory, addr, src_addr, irtype);
4150
4151         ir_node *const copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
4152         set_store(copyb_mem);
4153 }
4154
4155 static void create_initializer_local_variable_entity(entity_t *entity)
4156 {
4157         assert(entity->kind == ENTITY_VARIABLE);
4158         initializer_t *initializer = entity->variable.initializer;
4159         dbg_info      *dbgi        = get_dbg_info(&entity->base.source_position);
4160         ir_entity     *irentity    = entity->variable.v.entity;
4161         type_t        *type        = entity->declaration.type;
4162
4163         create_local_initializer(initializer, dbgi, irentity, type);
4164 }
4165
4166 static void create_variable_initializer(entity_t *entity)
4167 {
4168         assert(entity->kind == ENTITY_VARIABLE);
4169         initializer_t *initializer = entity->variable.initializer;
4170         if (initializer == NULL)
4171                 return;
4172
4173         declaration_kind_t declaration_kind
4174                 = (declaration_kind_t) entity->declaration.kind;
4175         if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY) {
4176                 create_initializer_local_variable_entity(entity);
4177                 return;
4178         }
4179
4180         type_t            *type = entity->declaration.type;
4181         type_qualifiers_t  tq   = get_type_qualifier(type, true);
4182
4183         if (initializer->kind == INITIALIZER_VALUE) {
4184                 expression_t *      value     = initializer->value.value;
4185                 type_t       *const init_type = skip_typeref(value->base.type);
4186
4187                 if (!is_type_scalar(init_type)) {
4188                         /* skip convs */
4189                         while (value->kind == EXPR_UNARY_CAST)
4190                                 value = value->unary.value;
4191
4192                         if (value->kind != EXPR_COMPOUND_LITERAL)
4193                                 panic("expected non-scalar initializer to be a compound literal");
4194                         initializer = value->compound_literal.initializer;
4195                         goto have_initializer;
4196                 }
4197
4198                 ir_node  *      node = expression_to_firm(value);
4199                 dbg_info *const dbgi = get_dbg_info(&entity->base.source_position);
4200                 ir_mode  *const mode = get_ir_mode_storage(init_type);
4201                 node = create_conv(dbgi, node, mode);
4202                 node = do_strict_conv(dbgi, node);
4203
4204                 if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE) {
4205                         set_value(entity->variable.v.value_number, node);
4206                 } else {
4207                         assert(declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4208
4209                         ir_entity *irentity = entity->variable.v.entity;
4210
4211                         if (tq & TYPE_QUALIFIER_CONST
4212                                         && get_entity_owner(irentity) != get_tls_type()) {
4213                                 add_entity_linkage(irentity, IR_LINKAGE_CONSTANT);
4214                         }
4215                         set_atomic_ent_value(irentity, node);
4216                 }
4217         } else {
4218 have_initializer:
4219                 assert(declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY ||
4220                        declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4221
4222                 ir_entity        *irentity        = entity->variable.v.entity;
4223                 ir_initializer_t *irinitializer
4224                         = create_ir_initializer(initializer, type);
4225
4226                 if (tq & TYPE_QUALIFIER_CONST) {
4227                         add_entity_linkage(irentity, IR_LINKAGE_CONSTANT);
4228                 }
4229                 set_entity_initializer(irentity, irinitializer);
4230         }
4231 }
4232
4233 static void create_variable_length_array(entity_t *entity)
4234 {
4235         assert(entity->kind == ENTITY_VARIABLE);
4236         assert(entity->variable.initializer == NULL);
4237
4238         entity->declaration.kind    = DECLARATION_KIND_VARIABLE_LENGTH_ARRAY;
4239         entity->variable.v.vla_base = NULL;
4240
4241         /* TODO: record VLA somewhere so we create the free node when we leave
4242          * it's scope */
4243 }
4244
4245 static void allocate_variable_length_array(entity_t *entity)
4246 {
4247         assert(entity->kind == ENTITY_VARIABLE);
4248         assert(entity->variable.initializer == NULL);
4249         assert(currently_reachable());
4250
4251         dbg_info *dbgi      = get_dbg_info(&entity->base.source_position);
4252         type_t   *type      = entity->declaration.type;
4253         ir_type  *el_type   = get_ir_type(type->array.element_type);
4254
4255         /* make sure size_node is calculated */
4256         get_type_size_node(type);
4257         ir_node  *elems = type->array.size_node;
4258         ir_node  *mem   = get_store();
4259         ir_node  *alloc = new_d_Alloc(dbgi, mem, elems, el_type, stack_alloc);
4260
4261         ir_node  *proj_m = new_d_Proj(dbgi, alloc, mode_M, pn_Alloc_M);
4262         ir_node  *addr   = new_d_Proj(dbgi, alloc, mode_P_data, pn_Alloc_res);
4263         set_store(proj_m);
4264
4265         assert(entity->declaration.kind == DECLARATION_KIND_VARIABLE_LENGTH_ARRAY);
4266         entity->variable.v.vla_base = addr;
4267 }
4268
4269 /**
4270  * Creates a Firm local variable from a declaration.
4271  */
4272 static void create_local_variable(entity_t *entity)
4273 {
4274         assert(entity->kind == ENTITY_VARIABLE);
4275         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4276
4277         bool needs_entity = entity->variable.address_taken;
4278         type_t *type = skip_typeref(entity->declaration.type);
4279
4280         /* is it a variable length array? */
4281         if (is_type_array(type) && !type->array.size_constant) {
4282                 create_variable_length_array(entity);
4283                 return;
4284         } else if (is_type_array(type) || is_type_compound(type)) {
4285                 needs_entity = true;
4286         } else if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
4287                 needs_entity = true;
4288         }
4289
4290         if (needs_entity) {
4291                 ir_type *frame_type = get_irg_frame_type(current_ir_graph);
4292                 create_variable_entity(entity,
4293                                        DECLARATION_KIND_LOCAL_VARIABLE_ENTITY,
4294                                        frame_type);
4295         } else {
4296                 entity->declaration.kind        = DECLARATION_KIND_LOCAL_VARIABLE;
4297                 entity->variable.v.value_number = next_value_number_function;
4298                 set_irg_loc_description(current_ir_graph, next_value_number_function,
4299                                         entity);
4300                 ++next_value_number_function;
4301         }
4302 }
4303
4304 static void create_local_static_variable(entity_t *entity)
4305 {
4306         assert(entity->kind == ENTITY_VARIABLE);
4307         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4308
4309         type_t   *type           = skip_typeref(entity->declaration.type);
4310         ir_type  *const var_type = entity->variable.thread_local ?
4311                 get_tls_type() : get_glob_type();
4312         ir_type  *const irtype   = get_ir_type(type);
4313         dbg_info *const dbgi     = get_dbg_info(&entity->base.source_position);
4314
4315         size_t l = strlen(entity->base.symbol->string);
4316         char   buf[l + sizeof(".%u")];
4317         snprintf(buf, sizeof(buf), "%s.%%u", entity->base.symbol->string);
4318         ident     *const id       = id_unique(buf);
4319         ir_entity *const irentity = new_d_entity(var_type, id, irtype, dbgi);
4320
4321         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
4322                 set_entity_volatility(irentity, volatility_is_volatile);
4323         }
4324
4325         entity->declaration.kind  = DECLARATION_KIND_GLOBAL_VARIABLE;
4326         entity->variable.v.entity = irentity;
4327
4328         set_entity_ld_ident(irentity, id);
4329         set_entity_visibility(irentity, ir_visibility_local);
4330
4331         if (entity->variable.initializer == NULL) {
4332                 ir_initializer_t *null_init = get_initializer_null();
4333                 set_entity_initializer(irentity, null_init);
4334         }
4335
4336         ir_graph *const old_current_ir_graph = current_ir_graph;
4337         current_ir_graph = get_const_code_irg();
4338
4339         create_variable_initializer(entity);
4340
4341         assert(current_ir_graph == get_const_code_irg());
4342         current_ir_graph = old_current_ir_graph;
4343 }
4344
4345
4346
4347 static ir_node *return_statement_to_firm(return_statement_t *statement)
4348 {
4349         if (!currently_reachable())
4350                 return NULL;
4351
4352         dbg_info *const dbgi = get_dbg_info(&statement->base.source_position);
4353         type_t   *const type = skip_typeref(current_function_entity->declaration.type->function.return_type);
4354         ir_node  *      res  = statement->value ? expression_to_firm(statement->value) : NULL;
4355
4356         int in_len;
4357         if (!is_type_void(type)) {
4358                 ir_mode *const mode = get_ir_mode_storage(type);
4359                 if (res) {
4360                         res = create_conv(dbgi, res, mode);
4361                         res = do_strict_conv(dbgi, res);
4362                 } else {
4363                         res = new_Unknown(mode);
4364                 }
4365                 in_len = 1;
4366         } else {
4367                 in_len = 0;
4368         }
4369
4370         ir_node *const in[1] = { res };
4371         ir_node *const store = get_store();
4372         ir_node *const ret   = new_d_Return(dbgi, store, in_len, in);
4373
4374         ir_node *end_block = get_irg_end_block(current_ir_graph);
4375         add_immBlock_pred(end_block, ret);
4376
4377         set_unreachable_now();
4378         return NULL;
4379 }
4380
4381 static ir_node *expression_statement_to_firm(expression_statement_t *statement)
4382 {
4383         if (!currently_reachable())
4384                 return NULL;
4385
4386         return expression_to_firm(statement->expression);
4387 }
4388
4389 static void create_local_declarations(entity_t*);
4390
4391 static ir_node *compound_statement_to_firm(compound_statement_t *compound)
4392 {
4393         create_local_declarations(compound->scope.entities);
4394
4395         ir_node     *result    = NULL;
4396         statement_t *statement = compound->statements;
4397         for ( ; statement != NULL; statement = statement->base.next) {
4398                 result = statement_to_firm(statement);
4399         }
4400
4401         return result;
4402 }
4403
4404 static void create_global_variable(entity_t *entity)
4405 {
4406         ir_linkage          linkage    = IR_LINKAGE_DEFAULT;
4407         ir_visibility       visibility = ir_visibility_external;
4408         storage_class_tag_t storage
4409                 = (storage_class_tag_t)entity->declaration.storage_class;
4410         decl_modifiers_t    modifiers  = entity->declaration.modifiers;
4411         assert(entity->kind == ENTITY_VARIABLE);
4412
4413         switch (storage) {
4414         case STORAGE_CLASS_EXTERN: visibility = ir_visibility_external; break;
4415         case STORAGE_CLASS_STATIC: visibility = ir_visibility_local;    break;
4416         case STORAGE_CLASS_NONE:   visibility = ir_visibility_external; break;
4417         case STORAGE_CLASS_TYPEDEF:
4418         case STORAGE_CLASS_AUTO:
4419         case STORAGE_CLASS_REGISTER:
4420                 panic("invalid storage class for global var");
4421         }
4422
4423         /* "common" symbols */
4424         if (storage == STORAGE_CLASS_NONE
4425             && entity->variable.initializer == NULL
4426             && !entity->variable.thread_local
4427             && (modifiers & DM_WEAK) == 0) {
4428                 linkage |= IR_LINKAGE_MERGE;
4429         }
4430
4431         ir_type *var_type = get_glob_type();
4432         if (entity->variable.thread_local) {
4433                 var_type = get_tls_type();
4434         }
4435         create_variable_entity(entity, DECLARATION_KIND_GLOBAL_VARIABLE, var_type);
4436         ir_entity *irentity = entity->variable.v.entity;
4437         add_entity_linkage(irentity, linkage);
4438         set_entity_visibility(irentity, visibility);
4439         if (entity->variable.initializer == NULL
4440             && storage != STORAGE_CLASS_EXTERN) {
4441                 ir_initializer_t *null_init = get_initializer_null();
4442                 set_entity_initializer(irentity, null_init);
4443         }
4444 }
4445
4446 static void create_local_declaration(entity_t *entity)
4447 {
4448         assert(is_declaration(entity));
4449
4450         /* construct type */
4451         (void) get_ir_type(entity->declaration.type);
4452         if (entity->base.symbol == NULL) {
4453                 return;
4454         }
4455
4456         switch ((storage_class_tag_t) entity->declaration.storage_class) {
4457         case STORAGE_CLASS_STATIC:
4458                 if (entity->kind == ENTITY_FUNCTION) {
4459                         (void)get_function_entity(entity, NULL);
4460                 } else {
4461                         create_local_static_variable(entity);
4462                 }
4463                 return;
4464         case STORAGE_CLASS_EXTERN:
4465                 if (entity->kind == ENTITY_FUNCTION) {
4466                         assert(entity->function.statement == NULL);
4467                         (void)get_function_entity(entity, NULL);
4468                 } else {
4469                         create_global_variable(entity);
4470                         create_variable_initializer(entity);
4471                 }
4472                 return;
4473         case STORAGE_CLASS_NONE:
4474         case STORAGE_CLASS_AUTO:
4475         case STORAGE_CLASS_REGISTER:
4476                 if (entity->kind == ENTITY_FUNCTION) {
4477                         if (entity->function.statement != NULL) {
4478                                 ir_type *owner = get_irg_frame_type(current_ir_graph);
4479                                 (void)get_function_entity(entity, owner);
4480                                 entity->declaration.kind = DECLARATION_KIND_INNER_FUNCTION;
4481                                 enqueue_inner_function(entity);
4482                         } else {
4483                                 (void)get_function_entity(entity, NULL);
4484                         }
4485                 } else {
4486                         create_local_variable(entity);
4487                 }
4488                 return;
4489         case STORAGE_CLASS_TYPEDEF:
4490                 break;
4491         }
4492         panic("invalid storage class found");
4493 }
4494
4495 static void create_local_declarations(entity_t *e)
4496 {
4497         for (; e; e = e->base.next) {
4498                 if (is_declaration(e))
4499                         create_local_declaration(e);
4500         }
4501 }
4502
4503 static void initialize_local_declaration(entity_t *entity)
4504 {
4505         if (entity->base.symbol == NULL)
4506                 return;
4507
4508         // no need to emit code in dead blocks
4509         if (entity->declaration.storage_class != STORAGE_CLASS_STATIC
4510                         && !currently_reachable())
4511                 return;
4512
4513         switch ((declaration_kind_t) entity->declaration.kind) {
4514         case DECLARATION_KIND_LOCAL_VARIABLE:
4515         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY:
4516                 create_variable_initializer(entity);
4517                 return;
4518
4519         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
4520                 allocate_variable_length_array(entity);
4521                 return;
4522
4523         case DECLARATION_KIND_COMPOUND_MEMBER:
4524         case DECLARATION_KIND_GLOBAL_VARIABLE:
4525         case DECLARATION_KIND_FUNCTION:
4526         case DECLARATION_KIND_INNER_FUNCTION:
4527                 return;
4528
4529         case DECLARATION_KIND_PARAMETER:
4530         case DECLARATION_KIND_PARAMETER_ENTITY:
4531                 panic("can't initialize parameters");
4532
4533         case DECLARATION_KIND_UNKNOWN:
4534                 panic("can't initialize unknown declaration");
4535         }
4536         panic("invalid declaration kind");
4537 }
4538
4539 static ir_node *declaration_statement_to_firm(declaration_statement_t *statement)
4540 {
4541         entity_t *entity = statement->declarations_begin;
4542         if (entity == NULL)
4543                 return NULL;
4544
4545         entity_t *const last = statement->declarations_end;
4546         for ( ;; entity = entity->base.next) {
4547                 if (is_declaration(entity)) {
4548                         initialize_local_declaration(entity);
4549                 } else if (entity->kind == ENTITY_TYPEDEF) {
4550                         /* §6.7.7:3  Any array size expressions associated with variable length
4551                          * array declarators are evaluated each time the declaration of the
4552                          * typedef name is reached in the order of execution. */
4553                         type_t *const type = skip_typeref(entity->typedefe.type);
4554                         if (is_type_array(type) && type->array.is_vla)
4555                                 get_vla_size(&type->array);
4556                 }
4557                 if (entity == last)
4558                         break;
4559         }
4560
4561         return NULL;
4562 }
4563
4564 static ir_node *if_statement_to_firm(if_statement_t *statement)
4565 {
4566         create_local_declarations(statement->scope.entities);
4567
4568         /* Create the condition. */
4569         ir_node *true_block  = NULL;
4570         ir_node *false_block = NULL;
4571         if (currently_reachable()) {
4572                 true_block  = new_immBlock();
4573                 false_block = new_immBlock();
4574                 create_condition_evaluation(statement->condition, true_block, false_block);
4575                 mature_immBlock(true_block);
4576                 mature_immBlock(false_block);
4577         }
4578
4579         /* Create the true statement. */
4580         set_cur_block(true_block);
4581         statement_to_firm(statement->true_statement);
4582         ir_node *fallthrough_block = get_cur_block();
4583
4584         /* Create the false statement. */
4585         set_cur_block(false_block);
4586         if (statement->false_statement != NULL) {
4587                 statement_to_firm(statement->false_statement);
4588         }
4589
4590         /* Handle the block after the if-statement.  Minor simplification and
4591          * optimisation: Reuse the false/true block as fallthrough block, if the
4592          * true/false statement does not pass control to the fallthrough block, e.g.
4593          * in the typical if (x) return; pattern. */
4594         if (fallthrough_block) {
4595                 if (currently_reachable()) {
4596                         ir_node *const t_jump = new_r_Jmp(fallthrough_block);
4597                         ir_node *const f_jump = new_Jmp();
4598                         ir_node *const in[]   = { t_jump, f_jump };
4599                         fallthrough_block = new_Block(2, in);
4600                 }
4601                 set_cur_block(fallthrough_block);
4602         }
4603
4604         return NULL;
4605 }
4606
4607 /**
4608  * Add an unconditional jump to the target block.  If the source block is not
4609  * reachable, then a Bad predecessor is created to prevent Phi-less unreachable
4610  * loops.  This is necessary if the jump potentially enters a loop.
4611  */
4612 static void jump_to(ir_node *const target_block)
4613 {
4614         ir_node *const pred = currently_reachable() ? new_Jmp() : new_Bad(mode_X);
4615         add_immBlock_pred(target_block, pred);
4616 }
4617
4618 /**
4619  * Add an unconditional jump to the target block, if the current block is
4620  * reachable and do nothing otherwise.  This is only valid if the jump does not
4621  * enter a loop (a back edge is ok).
4622  */
4623 static void jump_if_reachable(ir_node *const target_block)
4624 {
4625         if (currently_reachable())
4626                 add_immBlock_pred(target_block, new_Jmp());
4627 }
4628
4629 static ir_node *while_statement_to_firm(while_statement_t *statement)
4630 {
4631         create_local_declarations(statement->scope.entities);
4632
4633         /* Create the header block */
4634         ir_node *const header_block = new_immBlock();
4635         jump_to(header_block);
4636
4637         /* Create the condition. */
4638         ir_node      *      body_block;
4639         ir_node      *      false_block;
4640         expression_t *const cond = statement->condition;
4641         if (is_constant_expression(cond) == EXPR_CLASS_CONSTANT &&
4642                         fold_constant_to_bool(cond)) {
4643                 /* Shortcut for while (true). */
4644                 body_block  = header_block;
4645                 false_block = NULL;
4646
4647                 keep_alive(header_block);
4648                 keep_all_memory(header_block);
4649         } else {
4650                 body_block  = new_immBlock();
4651                 false_block = new_immBlock();
4652
4653                 set_cur_block(header_block);
4654                 create_condition_evaluation(cond, body_block, false_block);
4655                 mature_immBlock(body_block);
4656         }
4657
4658         ir_node *const old_continue_label = continue_label;
4659         ir_node *const old_break_label    = break_label;
4660         continue_label = header_block;
4661         break_label    = false_block;
4662
4663         /* Create the loop body. */
4664         set_cur_block(body_block);
4665         statement_to_firm(statement->body);
4666         jump_if_reachable(header_block);
4667
4668         mature_immBlock(header_block);
4669         assert(false_block == NULL || false_block == break_label);
4670         false_block = break_label;
4671         if (false_block != NULL) {
4672                 mature_immBlock(false_block);
4673         }
4674         set_cur_block(false_block);
4675
4676         assert(continue_label == header_block);
4677         continue_label = old_continue_label;
4678         break_label    = old_break_label;
4679         return NULL;
4680 }
4681
4682 static ir_node *get_break_label(void)
4683 {
4684         if (break_label == NULL) {
4685                 break_label = new_immBlock();
4686         }
4687         return break_label;
4688 }
4689
4690 static ir_node *do_while_statement_to_firm(do_while_statement_t *statement)
4691 {
4692         create_local_declarations(statement->scope.entities);
4693
4694         /* create the header block */
4695         ir_node *header_block = new_immBlock();
4696
4697         /* the loop body */
4698         ir_node *body_block = new_immBlock();
4699         jump_to(body_block);
4700
4701         ir_node *old_continue_label = continue_label;
4702         ir_node *old_break_label    = break_label;
4703         continue_label              = header_block;
4704         break_label                 = NULL;
4705
4706         set_cur_block(body_block);
4707         statement_to_firm(statement->body);
4708         ir_node *const false_block = get_break_label();
4709
4710         assert(continue_label == header_block);
4711         continue_label = old_continue_label;
4712         break_label    = old_break_label;
4713
4714         jump_if_reachable(header_block);
4715
4716         /* create the condition */
4717         mature_immBlock(header_block);
4718         set_cur_block(header_block);
4719
4720         create_condition_evaluation(statement->condition, body_block, false_block);
4721         mature_immBlock(body_block);
4722         mature_immBlock(false_block);
4723
4724         set_cur_block(false_block);
4725         return NULL;
4726 }
4727
4728 static ir_node *for_statement_to_firm(for_statement_t *statement)
4729 {
4730         create_local_declarations(statement->scope.entities);
4731
4732         if (currently_reachable()) {
4733                 entity_t *entity = statement->scope.entities;
4734                 for ( ; entity != NULL; entity = entity->base.next) {
4735                         if (!is_declaration(entity))
4736                                 continue;
4737
4738                         initialize_local_declaration(entity);
4739                 }
4740
4741                 if (statement->initialisation != NULL) {
4742                         expression_to_firm(statement->initialisation);
4743                 }
4744         }
4745
4746         /* Create the header block */
4747         ir_node *const header_block = new_immBlock();
4748         jump_to(header_block);
4749
4750         /* Create the condition. */
4751         ir_node *body_block;
4752         ir_node *false_block;
4753         if (statement->condition != NULL) {
4754                 body_block  = new_immBlock();
4755                 false_block = new_immBlock();
4756
4757                 set_cur_block(header_block);
4758                 create_condition_evaluation(statement->condition, body_block, false_block);
4759                 mature_immBlock(body_block);
4760         } else {
4761                 /* for-ever. */
4762                 body_block  = header_block;
4763                 false_block = NULL;
4764
4765                 keep_alive(header_block);
4766                 keep_all_memory(header_block);
4767         }
4768
4769         /* Create the step block, if necessary. */
4770         ir_node      *      step_block = header_block;
4771         expression_t *const step       = statement->step;
4772         if (step != NULL) {
4773                 step_block = new_immBlock();
4774         }
4775
4776         ir_node *const old_continue_label = continue_label;
4777         ir_node *const old_break_label    = break_label;
4778         continue_label = step_block;
4779         break_label    = false_block;
4780
4781         /* Create the loop body. */
4782         set_cur_block(body_block);
4783         statement_to_firm(statement->body);
4784         jump_if_reachable(step_block);
4785
4786         /* Create the step code. */
4787         if (step != NULL) {
4788                 mature_immBlock(step_block);
4789                 set_cur_block(step_block);
4790                 expression_to_firm(step);
4791                 jump_if_reachable(header_block);
4792         }
4793
4794         mature_immBlock(header_block);
4795         assert(false_block == NULL || false_block == break_label);
4796         false_block = break_label;
4797         if (false_block != NULL) {
4798                 mature_immBlock(false_block);
4799         }
4800         set_cur_block(false_block);
4801
4802         assert(continue_label == step_block);
4803         continue_label = old_continue_label;
4804         break_label    = old_break_label;
4805         return NULL;
4806 }
4807
4808 static ir_node *create_jump_statement(const statement_t *statement, ir_node *target_block)
4809 {
4810         if (!currently_reachable())
4811                 return NULL;
4812
4813         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
4814         ir_node  *jump = new_d_Jmp(dbgi);
4815         add_immBlock_pred(target_block, jump);
4816
4817         set_unreachable_now();
4818         return NULL;
4819 }
4820
4821 static ir_switch_table *create_switch_table(const switch_statement_t *statement)
4822 {
4823         /* determine number of cases */
4824         size_t n_cases = 0;
4825         for (case_label_statement_t *l = statement->first_case; l != NULL;
4826              l = l->next) {
4827                 /* default case */
4828                 if (l->expression == NULL)
4829                         continue;
4830                 if (l->is_empty_range)
4831                         continue;
4832                 ++n_cases;
4833         }
4834
4835         ir_switch_table *res = ir_new_switch_table(current_ir_graph, n_cases);
4836         size_t           i   = 0;
4837         for (case_label_statement_t *l = statement->first_case; l != NULL;
4838              l = l->next) {
4839             if (l->expression == NULL) {
4840                         l->pn = pn_Switch_default;
4841                         continue;
4842                 }
4843                 if (l->is_empty_range)
4844                         continue;
4845                 ir_tarval *min = fold_constant_to_tarval(l->expression);
4846                 ir_tarval *max = min;
4847                 long       pn  = (long) i+1;
4848                 if (l->end_range != NULL)
4849                         max = fold_constant_to_tarval(l->end_range);
4850                 ir_switch_table_set(res, i++, min, max, pn);
4851                 l->pn = pn;
4852         }
4853         return res;
4854 }
4855
4856 static ir_node *switch_statement_to_firm(switch_statement_t *statement)
4857 {
4858         dbg_info *dbgi        = get_dbg_info(&statement->base.source_position);
4859         ir_node  *switch_node = NULL;
4860
4861         if (currently_reachable()) {
4862                 ir_node *expression = expression_to_firm(statement->expression);
4863                 ir_switch_table *table = create_switch_table(statement);
4864                 unsigned n_outs = (unsigned)ir_switch_table_get_n_entries(table) + 1;
4865
4866                 switch_node = new_d_Switch(dbgi, expression, n_outs, table);
4867         }
4868
4869         set_unreachable_now();
4870
4871         ir_node *const old_switch            = current_switch;
4872         ir_node *const old_break_label       = break_label;
4873         const bool     old_saw_default_label = saw_default_label;
4874         saw_default_label                    = false;
4875         current_switch                       = switch_node;
4876         break_label                          = NULL;
4877
4878         statement_to_firm(statement->body);
4879
4880         if (currently_reachable()) {
4881                 add_immBlock_pred(get_break_label(), new_Jmp());
4882         }
4883
4884         if (!saw_default_label && switch_node) {
4885                 ir_node *proj = new_d_Proj(dbgi, switch_node, mode_X, pn_Switch_default);
4886                 add_immBlock_pred(get_break_label(), proj);
4887         }
4888
4889         if (break_label != NULL) {
4890                 mature_immBlock(break_label);
4891         }
4892         set_cur_block(break_label);
4893
4894         assert(current_switch == switch_node);
4895         current_switch    = old_switch;
4896         break_label       = old_break_label;
4897         saw_default_label = old_saw_default_label;
4898         return NULL;
4899 }
4900
4901 static ir_node *case_label_to_firm(const case_label_statement_t *statement)
4902 {
4903         if (statement->is_empty_range)
4904                 return NULL;
4905
4906         if (current_switch != NULL) {
4907                 ir_node *block = new_immBlock();
4908                 /* Fallthrough from previous case */
4909                 jump_if_reachable(block);
4910
4911                 ir_node  *const proj = new_Proj(current_switch, mode_X, statement->pn);
4912                 add_immBlock_pred(block, proj);
4913                 if (statement->expression == NULL)
4914                         saw_default_label = true;
4915
4916                 mature_immBlock(block);
4917                 set_cur_block(block);
4918         }
4919
4920         return statement_to_firm(statement->statement);
4921 }
4922
4923 static ir_node *label_to_firm(const label_statement_t *statement)
4924 {
4925         ir_node *block = get_label_block(statement->label);
4926         jump_to(block);
4927
4928         set_cur_block(block);
4929         keep_alive(block);
4930         keep_all_memory(block);
4931
4932         return statement_to_firm(statement->statement);
4933 }
4934
4935 static ir_node *computed_goto_to_firm(computed_goto_statement_t const *const statement)
4936 {
4937         if (!currently_reachable())
4938                 return NULL;
4939
4940         ir_node  *const irn  = expression_to_firm(statement->expression);
4941         dbg_info *const dbgi = get_dbg_info(&statement->base.source_position);
4942         ir_node  *const ijmp = new_d_IJmp(dbgi, irn);
4943
4944         set_irn_link(ijmp, ijmp_list);
4945         ijmp_list = ijmp;
4946
4947         set_unreachable_now();
4948         return NULL;
4949 }
4950
4951 static ir_node *asm_statement_to_firm(const asm_statement_t *statement)
4952 {
4953         bool needs_memory = false;
4954
4955         if (statement->is_volatile) {
4956                 needs_memory = true;
4957         }
4958
4959         size_t         n_clobbers = 0;
4960         asm_clobber_t *clobber    = statement->clobbers;
4961         for ( ; clobber != NULL; clobber = clobber->next) {
4962                 const char *clobber_str = clobber->clobber.begin;
4963
4964                 if (!be_is_valid_clobber(clobber_str)) {
4965                         errorf(&statement->base.source_position,
4966                                    "invalid clobber '%s' specified", clobber->clobber);
4967                         continue;
4968                 }
4969
4970                 if (streq(clobber_str, "memory")) {
4971                         needs_memory = true;
4972                         continue;
4973                 }
4974
4975                 ident *id = new_id_from_str(clobber_str);
4976                 obstack_ptr_grow(&asm_obst, id);
4977                 ++n_clobbers;
4978         }
4979         assert(obstack_object_size(&asm_obst) == n_clobbers * sizeof(ident*));
4980         ident **clobbers = NULL;
4981         if (n_clobbers > 0) {
4982                 clobbers = obstack_finish(&asm_obst);
4983         }
4984
4985         size_t n_inputs  = 0;
4986         asm_argument_t *argument = statement->inputs;
4987         for ( ; argument != NULL; argument = argument->next)
4988                 n_inputs++;
4989         size_t n_outputs = 0;
4990         argument = statement->outputs;
4991         for ( ; argument != NULL; argument = argument->next)
4992                 n_outputs++;
4993
4994         unsigned next_pos = 0;
4995
4996         ir_node *ins[n_inputs + n_outputs + 1];
4997         size_t   in_size = 0;
4998
4999         ir_asm_constraint tmp_in_constraints[n_outputs];
5000
5001         const expression_t *out_exprs[n_outputs];
5002         ir_node            *out_addrs[n_outputs];
5003         size_t              out_size = 0;
5004
5005         argument = statement->outputs;
5006         for ( ; argument != NULL; argument = argument->next) {
5007                 const char *constraints = argument->constraints.begin;
5008                 asm_constraint_flags_t asm_flags
5009                         = be_parse_asm_constraints(constraints);
5010
5011                 {
5012                         source_position_t const *const pos = &statement->base.source_position;
5013                         if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
5014                                 warningf(WARN_OTHER, pos, "some constraints in '%s' are not supported", constraints);
5015                         }
5016                         if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
5017                                 errorf(pos, "some constraints in '%s' are invalid", constraints);
5018                                 continue;
5019                         }
5020                         if (! (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE)) {
5021                                 errorf(pos, "no write flag specified for output constraints '%s'", constraints);
5022                                 continue;
5023                         }
5024                 }
5025
5026                 unsigned pos = next_pos++;
5027                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
5028                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
5029                         expression_t *expr = argument->expression;
5030                         ir_node      *addr = expression_to_addr(expr);
5031                         /* in+output, construct an artifical same_as constraint on the
5032                          * input */
5033                         if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_READ) {
5034                                 char     buf[64];
5035                                 ir_node *value = get_value_from_lvalue(expr, addr);
5036
5037                                 snprintf(buf, sizeof(buf), "%u", (unsigned) out_size);
5038
5039                                 ir_asm_constraint constraint;
5040                                 constraint.pos              = pos;
5041                                 constraint.constraint       = new_id_from_str(buf);
5042                                 constraint.mode             = get_ir_mode_storage(expr->base.type);
5043                                 tmp_in_constraints[in_size] = constraint;
5044                                 ins[in_size] = value;
5045
5046                                 ++in_size;
5047                         }
5048
5049                         out_exprs[out_size] = expr;
5050                         out_addrs[out_size] = addr;
5051                         ++out_size;
5052                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
5053                         /* pure memory ops need no input (but we have to make sure we
5054                          * attach to the memory) */
5055                         assert(! (asm_flags &
5056                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
5057                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
5058                         needs_memory = true;
5059
5060                         /* we need to attach the address to the inputs */
5061                         expression_t *expr = argument->expression;
5062
5063                         ir_asm_constraint constraint;
5064                         constraint.pos              = pos;
5065                         constraint.constraint       = new_id_from_str(constraints);
5066                         constraint.mode             = mode_M;
5067                         tmp_in_constraints[in_size] = constraint;
5068
5069                         ins[in_size]          = expression_to_addr(expr);
5070                         ++in_size;
5071                         continue;
5072                 } else {
5073                         errorf(&statement->base.source_position,
5074                                "only modifiers but no place set in constraints '%s'",
5075                                constraints);
5076                         continue;
5077                 }
5078
5079                 ir_asm_constraint constraint;
5080                 constraint.pos        = pos;
5081                 constraint.constraint = new_id_from_str(constraints);
5082                 constraint.mode       = get_ir_mode_storage(argument->expression->base.type);
5083
5084                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5085         }
5086         assert(obstack_object_size(&asm_obst)
5087                         == out_size * sizeof(ir_asm_constraint));
5088         ir_asm_constraint *output_constraints = obstack_finish(&asm_obst);
5089
5090
5091         obstack_grow(&asm_obst, tmp_in_constraints,
5092                      in_size * sizeof(tmp_in_constraints[0]));
5093         /* find and count input and output arguments */
5094         argument = statement->inputs;
5095         for ( ; argument != NULL; argument = argument->next) {
5096                 const char *constraints = argument->constraints.begin;
5097                 asm_constraint_flags_t asm_flags
5098                         = be_parse_asm_constraints(constraints);
5099
5100                 if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
5101                         errorf(&statement->base.source_position,
5102                                "some constraints in '%s' are not supported", constraints);
5103                         continue;
5104                 }
5105                 if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
5106                         errorf(&statement->base.source_position,
5107                                "some constraints in '%s' are invalid", constraints);
5108                         continue;
5109                 }
5110                 if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE) {
5111                         errorf(&statement->base.source_position,
5112                                "write flag specified for input constraints '%s'",
5113                                constraints);
5114                         continue;
5115                 }
5116
5117                 ir_node *input;
5118                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
5119                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
5120                         /* we can treat this as "normal" input */
5121                         input = expression_to_firm(argument->expression);
5122                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
5123                         /* pure memory ops need no input (but we have to make sure we
5124                          * attach to the memory) */
5125                         assert(! (asm_flags &
5126                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
5127                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
5128                         needs_memory = true;
5129                         input = expression_to_addr(argument->expression);
5130                 } else {
5131                         errorf(&statement->base.source_position,
5132                                "only modifiers but no place set in constraints '%s'",
5133                                constraints);
5134                         continue;
5135                 }
5136
5137                 ir_asm_constraint constraint;
5138                 constraint.pos        = next_pos++;
5139                 constraint.constraint = new_id_from_str(constraints);
5140                 constraint.mode       = get_irn_mode(input);
5141
5142                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5143                 ins[in_size++] = input;
5144         }
5145
5146         if (needs_memory) {
5147                 ir_asm_constraint constraint;
5148                 constraint.pos        = next_pos++;
5149                 constraint.constraint = new_id_from_str("");
5150                 constraint.mode       = mode_M;
5151
5152                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5153                 ins[in_size++] = get_store();
5154         }
5155
5156         assert(obstack_object_size(&asm_obst)
5157                         == in_size * sizeof(ir_asm_constraint));
5158         ir_asm_constraint *input_constraints = obstack_finish(&asm_obst);
5159
5160         /* create asm node */
5161         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
5162
5163         ident *asm_text = new_id_from_str(statement->asm_text.begin);
5164
5165         ir_node *node = new_d_ASM(dbgi, in_size, ins, input_constraints,
5166                                   out_size, output_constraints,
5167                                   n_clobbers, clobbers, asm_text);
5168
5169         if (statement->is_volatile) {
5170                 set_irn_pinned(node, op_pin_state_pinned);
5171         } else {
5172                 set_irn_pinned(node, op_pin_state_floats);
5173         }
5174
5175         /* create output projs & connect them */
5176         if (needs_memory) {
5177                 ir_node *projm = new_Proj(node, mode_M, out_size);
5178                 set_store(projm);
5179         }
5180
5181         size_t i;
5182         for (i = 0; i < out_size; ++i) {
5183                 const expression_t *out_expr = out_exprs[i];
5184                 long                pn       = i;
5185                 ir_mode            *mode     = get_ir_mode_storage(out_expr->base.type);
5186                 ir_node            *proj     = new_Proj(node, mode, pn);
5187                 ir_node            *addr     = out_addrs[i];
5188
5189                 set_value_for_expression_addr(out_expr, proj, addr);
5190         }
5191
5192         return NULL;
5193 }
5194
5195 static ir_node *ms_try_statement_to_firm(ms_try_statement_t *statement)
5196 {
5197         statement_to_firm(statement->try_statement);
5198         source_position_t const *const pos = &statement->base.source_position;
5199         warningf(WARN_OTHER, pos, "structured exception handling ignored");
5200         return NULL;
5201 }
5202
5203 static ir_node *leave_statement_to_firm(leave_statement_t *statement)
5204 {
5205         errorf(&statement->base.source_position, "__leave not supported yet");
5206         return NULL;
5207 }
5208
5209 /**
5210  * Transform a statement.
5211  */
5212 static ir_node *statement_to_firm(statement_t *const stmt)
5213 {
5214 #ifndef NDEBUG
5215         assert(!stmt->base.transformed);
5216         stmt->base.transformed = true;
5217 #endif
5218
5219         switch (stmt->kind) {
5220         case STATEMENT_ASM:           return asm_statement_to_firm(        &stmt->asms);
5221         case STATEMENT_CASE_LABEL:    return case_label_to_firm(           &stmt->case_label);
5222         case STATEMENT_COMPOUND:      return compound_statement_to_firm(   &stmt->compound);
5223         case STATEMENT_COMPUTED_GOTO: return computed_goto_to_firm(        &stmt->computed_goto);
5224         case STATEMENT_DECLARATION:   return declaration_statement_to_firm(&stmt->declaration);
5225         case STATEMENT_DO_WHILE:      return do_while_statement_to_firm(   &stmt->do_while);
5226         case STATEMENT_EMPTY:         return NULL; /* nothing */
5227         case STATEMENT_EXPRESSION:    return expression_statement_to_firm( &stmt->expression);
5228         case STATEMENT_FOR:           return for_statement_to_firm(        &stmt->fors);
5229         case STATEMENT_IF:            return if_statement_to_firm(         &stmt->ifs);
5230         case STATEMENT_LABEL:         return label_to_firm(                &stmt->label);
5231         case STATEMENT_LEAVE:         return leave_statement_to_firm(      &stmt->leave);
5232         case STATEMENT_MS_TRY:        return ms_try_statement_to_firm(     &stmt->ms_try);
5233         case STATEMENT_RETURN:        return return_statement_to_firm(     &stmt->returns);
5234         case STATEMENT_SWITCH:        return switch_statement_to_firm(     &stmt->switchs);
5235         case STATEMENT_WHILE:         return while_statement_to_firm(      &stmt->whiles);
5236
5237         case STATEMENT_BREAK:         return create_jump_statement(stmt, get_break_label());
5238         case STATEMENT_CONTINUE:      return create_jump_statement(stmt, continue_label);
5239         case STATEMENT_GOTO:          return create_jump_statement(stmt, get_label_block(stmt->gotos.label));
5240
5241         case STATEMENT_ERROR: panic("error statement found");
5242         }
5243         panic("statement not implemented");
5244 }
5245
5246 static int count_local_variables(const entity_t *entity,
5247                                  const entity_t *const last)
5248 {
5249         int count = 0;
5250         entity_t const *const end = last != NULL ? last->base.next : NULL;
5251         for (; entity != end; entity = entity->base.next) {
5252                 if ((entity->kind == ENTITY_VARIABLE || entity->kind == ENTITY_PARAMETER) &&
5253                     !entity->variable.address_taken                                       &&
5254                     is_type_scalar(skip_typeref(entity->declaration.type)))
5255                         ++count;
5256         }
5257         return count;
5258 }
5259
5260 static void count_local_variables_in_stmt(statement_t *stmt, void *const env)
5261 {
5262         int *const count = env;
5263
5264         switch (stmt->kind) {
5265         case STATEMENT_DECLARATION: {
5266                 const declaration_statement_t *const decl_stmt = &stmt->declaration;
5267                 *count += count_local_variables(decl_stmt->declarations_begin,
5268                                 decl_stmt->declarations_end);
5269                 break;
5270         }
5271
5272         case STATEMENT_FOR:
5273                 *count += count_local_variables(stmt->fors.scope.entities, NULL);
5274                 break;
5275
5276         default:
5277                 break;
5278         }
5279 }
5280
5281 /**
5282  * Return the number of local (alias free) variables used by a function.
5283  */
5284 static int get_function_n_local_vars(entity_t *entity)
5285 {
5286         const function_t *function = &entity->function;
5287         int count = 0;
5288
5289         /* count parameters */
5290         count += count_local_variables(function->parameters.entities, NULL);
5291
5292         /* count local variables declared in body */
5293         walk_statements(function->statement, count_local_variables_in_stmt, &count);
5294         return count;
5295 }
5296
5297 /**
5298  * Build Firm code for the parameters of a function.
5299  */
5300 static void initialize_function_parameters(entity_t *entity)
5301 {
5302         assert(entity->kind == ENTITY_FUNCTION);
5303         ir_graph *irg             = current_ir_graph;
5304         ir_node  *args            = get_irg_args(irg);
5305         int       n               = 0;
5306         ir_type  *function_irtype;
5307
5308         if (entity->function.need_closure) {
5309                 /* add an extra parameter for the static link */
5310                 entity->function.static_link = new_r_Proj(args, mode_P_data, 0);
5311                 ++n;
5312
5313                 /* Matze: IMO this is wrong, nested functions should have an own
5314                  * type and not rely on strange parameters... */
5315                 function_irtype = create_method_type(&entity->declaration.type->function, true);
5316         } else {
5317                 function_irtype = get_ir_type(entity->declaration.type);
5318         }
5319
5320
5321
5322         entity_t *parameter = entity->function.parameters.entities;
5323         for ( ; parameter != NULL; parameter = parameter->base.next, ++n) {
5324                 if (parameter->kind != ENTITY_PARAMETER)
5325                         continue;
5326
5327                 assert(parameter->declaration.kind == DECLARATION_KIND_UNKNOWN);
5328                 type_t *type = skip_typeref(parameter->declaration.type);
5329
5330                 assert(!is_type_array(type));
5331                 bool const needs_entity = parameter->variable.address_taken || is_type_compound(type);
5332
5333                 ir_type *param_irtype = get_method_param_type(function_irtype, n);
5334                 if (needs_entity) {
5335                         ir_type   *frame_type = get_irg_frame_type(irg);
5336                         ir_entity *param
5337                                 = new_parameter_entity(frame_type, n, param_irtype);
5338                         parameter->declaration.kind  = DECLARATION_KIND_PARAMETER_ENTITY;
5339                         parameter->variable.v.entity = param;
5340                         continue;
5341                 }
5342
5343                 ir_mode *param_mode = get_type_mode(param_irtype);
5344                 long     pn         = n;
5345                 ir_node *value      = new_r_Proj(args, param_mode, pn);
5346
5347                 ir_mode *mode = get_ir_mode_storage(type);
5348                 value = create_conv(NULL, value, mode);
5349                 value = do_strict_conv(NULL, value);
5350
5351                 parameter->declaration.kind        = DECLARATION_KIND_PARAMETER;
5352                 parameter->variable.v.value_number = next_value_number_function;
5353                 set_irg_loc_description(current_ir_graph, next_value_number_function,
5354                                         parameter);
5355                 ++next_value_number_function;
5356
5357                 set_value(parameter->variable.v.value_number, value);
5358         }
5359 }
5360
5361 /**
5362  * Handle additional decl modifiers for IR-graphs
5363  *
5364  * @param irg            the IR-graph
5365  * @param dec_modifiers  additional modifiers
5366  */
5367 static void handle_decl_modifier_irg(ir_graph *irg,
5368                                      decl_modifiers_t decl_modifiers)
5369 {
5370         if (decl_modifiers & DM_NAKED) {
5371                 /* TRUE if the declaration includes the Microsoft
5372                    __declspec(naked) specifier. */
5373                 add_irg_additional_properties(irg, mtp_property_naked);
5374         }
5375         if (decl_modifiers & DM_FORCEINLINE) {
5376                 /* TRUE if the declaration includes the
5377                    Microsoft __forceinline specifier. */
5378                 set_irg_inline_property(irg, irg_inline_forced);
5379         }
5380         if (decl_modifiers & DM_NOINLINE) {
5381                 /* TRUE if the declaration includes the Microsoft
5382                    __declspec(noinline) specifier. */
5383                 set_irg_inline_property(irg, irg_inline_forbidden);
5384         }
5385 }
5386
5387 static void add_function_pointer(ir_type *segment, ir_entity *method,
5388                                  const char *unique_template)
5389 {
5390         ir_type   *method_type  = get_entity_type(method);
5391         ir_type   *ptr_type     = new_type_pointer(method_type);
5392
5393         /* these entities don't really have a name but firm only allows
5394          * "" in ld_ident.
5395          * Note that we mustn't give these entities a name since for example
5396          * Mach-O doesn't allow them. */
5397         ident     *ide          = id_unique(unique_template);
5398         ir_entity *ptr          = new_entity(segment, ide, ptr_type);
5399         ir_graph  *irg          = get_const_code_irg();
5400         ir_node   *val          = new_rd_SymConst_addr_ent(NULL, irg, mode_P_code,
5401                                                            method);
5402
5403         set_entity_ld_ident(ptr, new_id_from_chars("", 0));
5404         set_entity_compiler_generated(ptr, 1);
5405         set_entity_visibility(ptr, ir_visibility_private);
5406         add_entity_linkage(ptr, IR_LINKAGE_CONSTANT|IR_LINKAGE_HIDDEN_USER);
5407         set_atomic_ent_value(ptr, val);
5408 }
5409
5410 /**
5411  * Generate possible IJmp branches to a given label block.
5412  */
5413 static void gen_ijmp_branches(ir_node *block)
5414 {
5415         ir_node *ijmp;
5416         for (ijmp = ijmp_list; ijmp != NULL; ijmp = get_irn_link(ijmp)) {
5417                 add_immBlock_pred(block, ijmp);
5418         }
5419 }
5420
5421 /**
5422  * Create code for a function and all inner functions.
5423  *
5424  * @param entity  the function entity
5425  */
5426 static void create_function(entity_t *entity)
5427 {
5428         assert(entity->kind == ENTITY_FUNCTION);
5429         ir_entity *function_entity = get_function_entity(entity, current_outer_frame);
5430
5431         if (entity->function.statement == NULL)
5432                 return;
5433
5434         inner_functions     = NULL;
5435         current_trampolines = NULL;
5436
5437         if (entity->declaration.modifiers & DM_CONSTRUCTOR) {
5438                 ir_type *segment = get_segment_type(IR_SEGMENT_CONSTRUCTORS);
5439                 add_function_pointer(segment, function_entity, "constructor_ptr.%u");
5440         }
5441         if (entity->declaration.modifiers & DM_DESTRUCTOR) {
5442                 ir_type *segment = get_segment_type(IR_SEGMENT_DESTRUCTORS);
5443                 add_function_pointer(segment, function_entity, "destructor_ptr.%u");
5444         }
5445
5446         current_function_entity = entity;
5447         current_function_name   = NULL;
5448         current_funcsig         = NULL;
5449
5450         assert(all_labels == NULL);
5451         all_labels = NEW_ARR_F(label_t *, 0);
5452         ijmp_list  = NULL;
5453
5454         int       n_local_vars = get_function_n_local_vars(entity);
5455         ir_graph *irg          = new_ir_graph(function_entity, n_local_vars);
5456         current_ir_graph = irg;
5457
5458         ir_graph *old_current_function = current_function;
5459         current_function = irg;
5460
5461         ir_entity *const old_current_vararg_entity = current_vararg_entity;
5462         current_vararg_entity = NULL;
5463
5464         set_irg_fp_model(irg, firm_fp_model);
5465         tarval_enable_fp_ops(1);
5466         set_irn_dbg_info(get_irg_start_block(irg),
5467                          get_entity_dbg_info(function_entity));
5468
5469         /* set inline flags */
5470         if (entity->function.is_inline)
5471                 set_irg_inline_property(irg, irg_inline_recomended);
5472         handle_decl_modifier_irg(irg, entity->declaration.modifiers);
5473
5474         next_value_number_function = 0;
5475         initialize_function_parameters(entity);
5476         current_static_link = entity->function.static_link;
5477
5478         statement_to_firm(entity->function.statement);
5479
5480         ir_node *end_block = get_irg_end_block(irg);
5481
5482         /* do we have a return statement yet? */
5483         if (currently_reachable()) {
5484                 type_t *type = skip_typeref(entity->declaration.type);
5485                 assert(is_type_function(type));
5486                 type_t *const return_type = skip_typeref(type->function.return_type);
5487
5488                 ir_node *ret;
5489                 if (is_type_void(return_type)) {
5490                         ret = new_Return(get_store(), 0, NULL);
5491                 } else {
5492                         ir_mode *const mode = get_ir_mode_storage(return_type);
5493
5494                         ir_node *in[1];
5495                         /* §5.1.2.2.3 main implicitly returns 0 */
5496                         if (is_main(entity)) {
5497                                 in[0] = new_Const(get_mode_null(mode));
5498                         } else {
5499                                 in[0] = new_Unknown(mode);
5500                         }
5501                         ret = new_Return(get_store(), 1, in);
5502                 }
5503                 add_immBlock_pred(end_block, ret);
5504         }
5505
5506         for (int i = ARR_LEN(all_labels) - 1; i >= 0; --i) {
5507                 label_t *label = all_labels[i];
5508                 if (label->address_taken) {
5509                         gen_ijmp_branches(label->block);
5510                 }
5511                 mature_immBlock(label->block);
5512         }
5513
5514         DEL_ARR_F(all_labels);
5515         all_labels = NULL;
5516
5517         irg_finalize_cons(irg);
5518
5519         /* finalize the frame type */
5520         ir_type *frame_type = get_irg_frame_type(irg);
5521         int      n          = get_compound_n_members(frame_type);
5522         int      align_all  = 4;
5523         int      offset     = 0;
5524         for (int i = 0; i < n; ++i) {
5525                 ir_entity *member      = get_compound_member(frame_type, i);
5526                 ir_type   *entity_type = get_entity_type(member);
5527
5528                 int align = get_type_alignment_bytes(entity_type);
5529                 if (align > align_all)
5530                         align_all = align;
5531                 int misalign = 0;
5532                 if (align > 0) {
5533                         misalign  = offset % align;
5534                         if (misalign > 0) {
5535                                 offset += align - misalign;
5536                         }
5537                 }
5538
5539                 set_entity_offset(member, offset);
5540                 offset += get_type_size_bytes(entity_type);
5541         }
5542         set_type_size_bytes(frame_type, offset);
5543         set_type_alignment_bytes(frame_type, align_all);
5544
5545         irg_verify(irg, VERIFY_ENFORCE_SSA);
5546         current_vararg_entity = old_current_vararg_entity;
5547         current_function      = old_current_function;
5548
5549         if (current_trampolines != NULL) {
5550                 DEL_ARR_F(current_trampolines);
5551                 current_trampolines = NULL;
5552         }
5553
5554         /* create inner functions if any */
5555         entity_t **inner = inner_functions;
5556         if (inner != NULL) {
5557                 ir_type *rem_outer_frame      = current_outer_frame;
5558                 current_outer_frame           = get_irg_frame_type(current_ir_graph);
5559                 for (int i = ARR_LEN(inner) - 1; i >= 0; --i) {
5560                         create_function(inner[i]);
5561                 }
5562                 DEL_ARR_F(inner);
5563
5564                 current_outer_frame      = rem_outer_frame;
5565         }
5566 }
5567
5568 static void scope_to_firm(scope_t *scope)
5569 {
5570         /* first pass: create declarations */
5571         entity_t *entity = scope->entities;
5572         for ( ; entity != NULL; entity = entity->base.next) {
5573                 if (entity->base.symbol == NULL)
5574                         continue;
5575
5576                 if (entity->kind == ENTITY_FUNCTION) {
5577                         if (entity->function.btk != BUILTIN_NONE) {
5578                                 /* builtins have no representation */
5579                                 continue;
5580                         }
5581                         (void)get_function_entity(entity, NULL);
5582                 } else if (entity->kind == ENTITY_VARIABLE) {
5583                         create_global_variable(entity);
5584                 } else if (entity->kind == ENTITY_NAMESPACE) {
5585                         scope_to_firm(&entity->namespacee.members);
5586                 }
5587         }
5588
5589         /* second pass: create code/initializers */
5590         entity = scope->entities;
5591         for ( ; entity != NULL; entity = entity->base.next) {
5592                 if (entity->base.symbol == NULL)
5593                         continue;
5594
5595                 if (entity->kind == ENTITY_FUNCTION) {
5596                         if (entity->function.btk != BUILTIN_NONE) {
5597                                 /* builtins have no representation */
5598                                 continue;
5599                         }
5600                         create_function(entity);
5601                 } else if (entity->kind == ENTITY_VARIABLE) {
5602                         assert(entity->declaration.kind
5603                                         == DECLARATION_KIND_GLOBAL_VARIABLE);
5604                         current_ir_graph = get_const_code_irg();
5605                         create_variable_initializer(entity);
5606                 }
5607         }
5608 }
5609
5610 void init_ast2firm(void)
5611 {
5612         obstack_init(&asm_obst);
5613         init_atomic_modes();
5614
5615         ir_set_debug_retrieve(dbg_retrieve);
5616         ir_set_type_debug_retrieve(dbg_print_type_dbg_info);
5617
5618         /* create idents for all known runtime functions */
5619         for (size_t i = 0; i < lengthof(rts_data); ++i) {
5620                 rts_idents[i] = new_id_from_str(rts_data[i].name);
5621         }
5622
5623         entitymap_init(&entitymap);
5624 }
5625
5626 static void init_ir_types(void)
5627 {
5628         static int ir_types_initialized = 0;
5629         if (ir_types_initialized)
5630                 return;
5631         ir_types_initialized = 1;
5632
5633         ir_type_char    = get_ir_type(type_char);
5634         ir_type_wchar_t = get_ir_type(type_wchar_t);
5635
5636         be_params             = be_get_backend_param();
5637         mode_float_arithmetic = be_params->mode_float_arithmetic;
5638
5639         stack_param_align     = be_params->stack_param_align;
5640 }
5641
5642 void exit_ast2firm(void)
5643 {
5644         entitymap_destroy(&entitymap);
5645         obstack_free(&asm_obst, NULL);
5646 }
5647
5648 static void global_asm_to_firm(statement_t *s)
5649 {
5650         for (; s != NULL; s = s->base.next) {
5651                 assert(s->kind == STATEMENT_ASM);
5652
5653                 char const *const text = s->asms.asm_text.begin;
5654                 size_t            size = s->asms.asm_text.size;
5655
5656                 /* skip the last \0 */
5657                 if (text[size - 1] == '\0')
5658                         --size;
5659
5660                 ident *const id = new_id_from_chars(text, size);
5661                 add_irp_asm(id);
5662         }
5663 }
5664
5665 static const char *get_cwd(void)
5666 {
5667         static char buf[1024];
5668         if (buf[0] == '\0')
5669                 getcwd(buf, sizeof(buf));
5670         return buf;
5671 }
5672
5673 void translation_unit_to_firm(translation_unit_t *unit)
5674 {
5675         if (c_mode & _CXX) {
5676                 be_dwarf_set_source_language(DW_LANG_C_plus_plus);
5677         } else if (c_mode & _C99) {
5678                 be_dwarf_set_source_language(DW_LANG_C99);
5679         } else if (c_mode & _C89) {
5680                 be_dwarf_set_source_language(DW_LANG_C89);
5681         } else {
5682                 be_dwarf_set_source_language(DW_LANG_C);
5683         }
5684         be_dwarf_set_compilation_directory(get_cwd());
5685
5686         /* initialize firm arithmetic */
5687         tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
5688         ir_set_uninitialized_local_variable_func(uninitialized_local_var);
5689
5690         /* just to be sure */
5691         continue_label           = NULL;
5692         break_label              = NULL;
5693         current_switch           = NULL;
5694         current_translation_unit = unit;
5695
5696         init_ir_types();
5697
5698         scope_to_firm(&unit->scope);
5699         global_asm_to_firm(unit->global_asm);
5700
5701         current_ir_graph         = NULL;
5702         current_translation_unit = NULL;
5703 }