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 string constant.
1106  *
1107  * @param src_pos    the source position of the string constant
1108  * @param id_prefix  a prefix for the name of the generated string constant
1109  * @param value      the value of the string constant
1110  */
1111 static ir_node *string_to_firm(source_position_t const *const src_pos, char const *const id_prefix, string_encoding_t const enc, string_t const *const value)
1112 {
1113         size_t            slen;
1114         ir_type          *elem_type;
1115         ir_initializer_t *initializer;
1116         switch (enc) {
1117         case STRING_ENCODING_CHAR: {
1118                 slen        = value->size + 1;
1119                 elem_type   = ir_type_char;
1120                 initializer = create_initializer_compound(slen);
1121
1122                 ir_mode *const mode = get_type_mode(elem_type);
1123                 char const    *p    = value->begin;
1124                 for (size_t i = 0; i < slen; ++i) {
1125                         ir_tarval        *tv  = new_tarval_from_long(*p++, mode);
1126                         ir_initializer_t *val = create_initializer_tarval(tv);
1127                         set_initializer_compound_value(initializer, i, val);
1128                 }
1129                 goto finish;
1130         }
1131
1132         case STRING_ENCODING_WIDE: {
1133                 slen        = wstrlen(value) + 1;
1134                 elem_type   = ir_type_wchar_t;
1135                 initializer = create_initializer_compound(slen);
1136
1137                 ir_mode *const mode = get_type_mode(elem_type);
1138                 char const    *p    = value->begin;
1139                 for (size_t i = 0; i < slen; ++i) {
1140                         assert(p <= value->begin + value->size);
1141                         utf32             v   = read_utf8_char(&p);
1142                         ir_tarval        *tv  = new_tarval_from_long(v, mode);
1143                         ir_initializer_t *val = create_initializer_tarval(tv);
1144                         set_initializer_compound_value(initializer, i, val);
1145                 }
1146                 goto finish;
1147         }
1148         }
1149         panic("invalid string encoding");
1150
1151 finish:;
1152         ir_type *const type = new_type_array(1, elem_type);
1153         set_array_bounds_int(type, 0, 0, slen);
1154         set_type_size_bytes( type, slen * get_type_size_bytes(elem_type));
1155         set_type_state(      type, layout_fixed);
1156
1157         ir_type   *const global_type = get_glob_type();
1158         ident     *const id          = id_unique(id_prefix);
1159         dbg_info  *const dbgi        = get_dbg_info(src_pos);
1160         ir_entity *const entity      = new_d_entity(global_type, id, type, dbgi);
1161         set_entity_ld_ident(   entity, id);
1162         set_entity_visibility( entity, ir_visibility_private);
1163         add_entity_linkage(    entity, IR_LINKAGE_CONSTANT);
1164         set_entity_initializer(entity, initializer);
1165
1166         return create_symconst(dbgi, entity);
1167 }
1168
1169 static bool try_create_integer(literal_expression_t *literal, type_t *type)
1170 {
1171         const char *string = literal->value.begin;
1172         size_t      size   = literal->value.size;
1173
1174         assert(type->kind == TYPE_ATOMIC);
1175         atomic_type_kind_t akind = type->atomic.akind;
1176
1177         ir_mode   *const mode = atomic_modes[akind];
1178         ir_tarval *const tv   = new_tarval_from_str(string, size, mode);
1179         if (tv == tarval_bad)
1180                 return false;
1181
1182         literal->base.type    = type;
1183         literal->target_value = tv;
1184         return true;
1185 }
1186
1187 static void create_integer_tarval(literal_expression_t *literal)
1188 {
1189         /* -1: signed only, 0: any, 1: unsigned only */
1190         int             sign   = literal->value.begin[0] != '0' /* decimal */ ? -1 : 0;
1191         unsigned        ls     = 0;
1192         const string_t *suffix = &literal->suffix;
1193         /* parse suffix */
1194         if (suffix->size > 0) {
1195                 for (const char *c = suffix->begin; *c != '\0'; ++c) {
1196                         if (*c == 'u' || *c == 'U') sign = 1;
1197                         if (*c == 'l' || *c == 'L') { ++ls; }
1198                 }
1199         }
1200
1201         tarval_int_overflow_mode_t old_mode = tarval_get_integer_overflow_mode();
1202
1203         /* now try if the constant is small enough for some types */
1204         tarval_set_integer_overflow_mode(TV_OVERFLOW_BAD);
1205         if (ls < 1) {
1206                 if (sign <= 0 && try_create_integer(literal, type_int))
1207                         goto finished;
1208                 if (sign >= 0 && try_create_integer(literal, type_unsigned_int))
1209                         goto finished;
1210         }
1211         if (ls < 2) {
1212                 if (sign <= 0 && try_create_integer(literal, type_long))
1213                         goto finished;
1214                 if (sign >= 0 && try_create_integer(literal, type_unsigned_long))
1215                         goto finished;
1216         }
1217         /* last try? then we should not report tarval_bad */
1218         if (sign < 0)
1219                 tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
1220         if (sign <= 0 && try_create_integer(literal, type_long_long))
1221                 goto finished;
1222
1223         /* last try */
1224         assert(sign >= 0);
1225         tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
1226         bool res = try_create_integer(literal, type_unsigned_long_long);
1227         if (!res)
1228                 panic("internal error when parsing number literal");
1229
1230 finished:
1231         tarval_set_integer_overflow_mode(old_mode);
1232 }
1233
1234 void determine_literal_type(literal_expression_t *literal)
1235 {
1236         switch (literal->base.kind) {
1237         case EXPR_LITERAL_INTEGER:
1238                 create_integer_tarval(literal);
1239                 return;
1240         default:
1241                 break;
1242         }
1243 }
1244
1245 /**
1246  * Creates a Const node representing a constant.
1247  */
1248 static ir_node *literal_to_firm(const literal_expression_t *literal)
1249 {
1250         type_t     *type   = skip_typeref(literal->base.type);
1251         ir_mode    *mode   = get_ir_mode_storage(type);
1252         const char *string = literal->value.begin;
1253         size_t      size   = literal->value.size;
1254         ir_tarval  *tv;
1255
1256         switch (literal->base.kind) {
1257         case EXPR_LITERAL_INTEGER:
1258                 assert(literal->target_value != NULL);
1259                 tv = literal->target_value;
1260                 break;
1261
1262         case EXPR_LITERAL_FLOATINGPOINT:
1263                 tv = new_tarval_from_str(string, size, mode);
1264                 break;
1265
1266         case EXPR_LITERAL_BOOLEAN:
1267                 if (string[0] == 't') {
1268                         tv = get_mode_one(mode);
1269                 } else {
1270                         assert(string[0] == 'f');
1271         case EXPR_LITERAL_MS_NOOP:
1272                         tv = get_mode_null(mode);
1273                 }
1274                 break;
1275
1276         default:
1277                 panic("Invalid literal kind found");
1278         }
1279
1280         dbg_info *dbgi       = get_dbg_info(&literal->base.source_position);
1281         ir_node  *res        = new_d_Const(dbgi, tv);
1282         ir_mode  *mode_arith = get_ir_mode_arithmetic(type);
1283         return create_conv(dbgi, res, mode_arith);
1284 }
1285
1286 /**
1287  * Creates a Const node representing a character constant.
1288  */
1289 static ir_node *char_literal_to_firm(string_literal_expression_t const *literal)
1290 {
1291         type_t     *type   = skip_typeref(literal->base.type);
1292         ir_mode    *mode   = get_ir_mode_storage(type);
1293         const char *string = literal->value.begin;
1294         size_t      size   = literal->value.size;
1295         ir_tarval  *tv;
1296
1297         switch (literal->base.kind) {
1298         case EXPR_LITERAL_WIDE_CHARACTER: {
1299                 utf32  v = read_utf8_char(&string);
1300                 char   buf[128];
1301                 size_t len = snprintf(buf, sizeof(buf), UTF32_PRINTF_FORMAT, v);
1302
1303                 tv = new_tarval_from_str(buf, len, mode);
1304                 break;
1305         }
1306
1307         case EXPR_LITERAL_CHARACTER: {
1308                 long long int v;
1309                 bool char_is_signed
1310                         = get_atomic_type_flags(ATOMIC_TYPE_CHAR) & ATOMIC_TYPE_FLAG_SIGNED;
1311                 if (size == 1 && char_is_signed) {
1312                         v = (signed char)string[0];
1313                 } else {
1314                         v = 0;
1315                         for (size_t i = 0; i < size; ++i) {
1316                                 v = (v << 8) | ((unsigned char)string[i]);
1317                         }
1318                 }
1319                 char   buf[128];
1320                 size_t len = snprintf(buf, sizeof(buf), "%lld", v);
1321
1322                 tv = new_tarval_from_str(buf, len, mode);
1323                 break;
1324         }
1325
1326         default:
1327                 panic("Invalid literal kind found");
1328         }
1329
1330         dbg_info *dbgi       = get_dbg_info(&literal->base.source_position);
1331         ir_node  *res        = new_d_Const(dbgi, tv);
1332         ir_mode  *mode_arith = get_ir_mode_arithmetic(type);
1333         return create_conv(dbgi, res, mode_arith);
1334 }
1335
1336 /*
1337  * Allocate an area of size bytes aligned at alignment
1338  * at a frame type.
1339  */
1340 static ir_entity *alloc_trampoline(ir_type *frame_type, int size, unsigned alignment)
1341 {
1342         static unsigned area_cnt = 0;
1343         char buf[32];
1344
1345         ir_type *tp = new_type_array(1, ir_type_char);
1346         set_array_bounds_int(tp, 0, 0, size);
1347         set_type_alignment_bytes(tp, alignment);
1348
1349         snprintf(buf, sizeof(buf), "trampolin%u", area_cnt++);
1350         ident *name = new_id_from_str(buf);
1351         ir_entity *area = new_entity(frame_type, name, tp);
1352
1353         /* mark this entity as compiler generated */
1354         set_entity_compiler_generated(area, 1);
1355         return area;
1356 }
1357
1358 /**
1359  * Return a node representing a trampoline region
1360  * for a given function entity.
1361  *
1362  * @param dbgi    debug info
1363  * @param entity  the function entity
1364  */
1365 static ir_node *get_trampoline_region(dbg_info *dbgi, ir_entity *entity)
1366 {
1367         ir_entity *region = NULL;
1368         int        i;
1369
1370         if (current_trampolines != NULL) {
1371                 for (i = ARR_LEN(current_trampolines) - 1; i >= 0; --i) {
1372                         if (current_trampolines[i].function == entity) {
1373                                 region = current_trampolines[i].region;
1374                                 break;
1375                         }
1376                 }
1377         } else {
1378                 current_trampolines = NEW_ARR_F(trampoline_region, 0);
1379         }
1380         ir_graph *irg = current_ir_graph;
1381         if (region == NULL) {
1382                 /* create a new region */
1383                 ir_type           *frame_tp = get_irg_frame_type(irg);
1384                 trampoline_region  reg;
1385                 reg.function = entity;
1386
1387                 reg.region   = alloc_trampoline(frame_tp,
1388                                                 be_params->trampoline_size,
1389                                                 be_params->trampoline_align);
1390                 ARR_APP1(trampoline_region, current_trampolines, reg);
1391                 region = reg.region;
1392         }
1393         return new_d_simpleSel(dbgi, get_irg_no_mem(irg), get_irg_frame(irg),
1394                                region);
1395 }
1396
1397 /**
1398  * Creates a trampoline for a function represented by an entity.
1399  *
1400  * @param dbgi    debug info
1401  * @param mode    the (reference) mode for the function address
1402  * @param entity  the function entity
1403  */
1404 static ir_node *create_trampoline(dbg_info *dbgi, ir_mode *mode,
1405                                   ir_entity *entity)
1406 {
1407         assert(entity != NULL);
1408         ir_node *in[3];
1409         in[0] = get_trampoline_region(dbgi, entity);
1410         in[1] = create_symconst(dbgi, entity);
1411         in[2] = get_irg_frame(current_ir_graph);
1412
1413         ir_node *irn = new_d_Builtin(dbgi, get_store(), 3, in, ir_bk_inner_trampoline, get_unknown_type());
1414         set_store(new_Proj(irn, mode_M, pn_Builtin_M));
1415         return new_Proj(irn, mode, pn_Builtin_max+1);
1416 }
1417
1418 /**
1419  * Dereference an address.
1420  *
1421  * @param dbgi  debug info
1422  * @param type  the type of the dereferenced result (the points_to type)
1423  * @param addr  the address to dereference
1424  */
1425 static ir_node *deref_address(dbg_info *const dbgi, type_t *const type,
1426                                       ir_node *const addr)
1427 {
1428         type_t *skipped = skip_typeref(type);
1429         if (is_type_incomplete(skipped))
1430                 return addr;
1431
1432         ir_type *irtype = get_ir_type(skipped);
1433         if (is_compound_type(irtype)
1434             || is_Method_type(irtype)
1435             || is_Array_type(irtype)) {
1436                 return addr;
1437         }
1438
1439         ir_cons_flags  flags    = skipped->base.qualifiers & TYPE_QUALIFIER_VOLATILE
1440                                   ? cons_volatile : cons_none;
1441         ir_mode *const mode     = get_type_mode(irtype);
1442         ir_node *const memory   = get_store();
1443         ir_node *const load     = new_d_Load(dbgi, memory, addr, mode, flags);
1444         ir_node *const load_mem = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1445         ir_node *const load_res = new_d_Proj(dbgi, load, mode,   pn_Load_res);
1446
1447         set_store(load_mem);
1448
1449         ir_mode *const mode_arithmetic = get_ir_mode_arithmetic(skipped);
1450         return create_conv(dbgi, load_res, mode_arithmetic);
1451 }
1452
1453 /**
1454  * Creates a strict Conv (to the node's mode) if necessary.
1455  *
1456  * @param dbgi  debug info
1457  * @param node  the node to strict conv
1458  */
1459 static ir_node *do_strict_conv(dbg_info *dbgi, ir_node *node)
1460 {
1461         ir_mode *mode = get_irn_mode(node);
1462
1463         if (!(get_irg_fp_model(current_ir_graph) & fp_explicit_rounding))
1464                 return node;
1465         if (!mode_is_float(mode))
1466                 return node;
1467
1468         /* check if there is already a Conv */
1469         if (is_Conv(node)) {
1470                 /* convert it into a strict Conv */
1471                 set_Conv_strict(node, 1);
1472                 return node;
1473         }
1474
1475         /* otherwise create a new one */
1476         return new_d_strictConv(dbgi, node, mode);
1477 }
1478
1479 /**
1480  * Returns the correct base address depending on whether it is a parameter or a
1481  * normal local variable.
1482  */
1483 static ir_node *get_local_frame(ir_entity *const ent)
1484 {
1485         ir_graph      *const irg   = current_ir_graph;
1486         const ir_type *const owner = get_entity_owner(ent);
1487         if (owner == current_outer_frame) {
1488                 assert(current_static_link != NULL);
1489                 return current_static_link;
1490         } else {
1491                 return get_irg_frame(irg);
1492         }
1493 }
1494
1495 /**
1496  * Keep all memory edges of the given block.
1497  */
1498 static void keep_all_memory(ir_node *block)
1499 {
1500         ir_node *old = get_cur_block();
1501
1502         set_cur_block(block);
1503         keep_alive(get_store());
1504         /* TODO: keep all memory edges from restricted pointers */
1505         set_cur_block(old);
1506 }
1507
1508 static ir_node *enum_constant_to_firm(reference_expression_t const *const ref)
1509 {
1510         entity_t *entity = ref->entity;
1511         if (entity->enum_value.tv == NULL) {
1512                 type_t *type = skip_typeref(entity->enum_value.enum_type);
1513                 assert(type->kind == TYPE_ENUM);
1514                 determine_enum_values(&type->enumt);
1515         }
1516
1517         return new_Const(entity->enum_value.tv);
1518 }
1519
1520 static ir_node *reference_addr(const reference_expression_t *ref)
1521 {
1522         dbg_info *dbgi   = get_dbg_info(&ref->base.source_position);
1523         entity_t *entity = ref->entity;
1524         assert(is_declaration(entity));
1525
1526         if (entity->kind == ENTITY_FUNCTION
1527             && entity->function.btk != BUILTIN_NONE) {
1528                 ir_entity *irentity = get_function_entity(entity, NULL);
1529                 /* for gcc compatibility we have to produce (dummy) addresses for some
1530                  * builtins which don't have entities */
1531                 if (irentity == NULL) {
1532                         source_position_t const *const pos = &ref->base.source_position;
1533                         warningf(WARN_OTHER, pos, "taking address of builtin '%N'", ref->entity);
1534
1535                         /* simply create a NULL pointer */
1536                         ir_mode  *mode = get_ir_mode_arithmetic(type_void_ptr);
1537                         ir_node  *res  = new_Const(get_mode_null(mode));
1538
1539                         return res;
1540                 }
1541         }
1542
1543         switch((declaration_kind_t) entity->declaration.kind) {
1544         case DECLARATION_KIND_UNKNOWN:
1545                 break;
1546         case DECLARATION_KIND_PARAMETER:
1547         case DECLARATION_KIND_LOCAL_VARIABLE:
1548                 /* you can store to a local variable (so we don't panic but return NULL
1549                  * as an indicator for no real address) */
1550                 return NULL;
1551         case DECLARATION_KIND_GLOBAL_VARIABLE: {
1552                 ir_node *const addr = create_symconst(dbgi, entity->variable.v.entity);
1553                 return addr;
1554         }
1555
1556         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY:
1557         case DECLARATION_KIND_PARAMETER_ENTITY: {
1558                 ir_entity *irentity = entity->variable.v.entity;
1559                 ir_node   *frame    = get_local_frame(irentity);
1560                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1561                 return sel;
1562         }
1563
1564         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
1565                 return entity->variable.v.vla_base;
1566
1567         case DECLARATION_KIND_FUNCTION: {
1568                 return create_symconst(dbgi, entity->function.irentity);
1569         }
1570
1571         case DECLARATION_KIND_INNER_FUNCTION: {
1572                 type_t  *const type = skip_typeref(entity->declaration.type);
1573                 ir_mode *const mode = get_ir_mode_storage(type);
1574                 if (!entity->function.goto_to_outer && !entity->function.need_closure) {
1575                         /* inner function not using the closure */
1576                         return create_symconst(dbgi, entity->function.irentity);
1577                 } else {
1578                         /* need trampoline here */
1579                         return create_trampoline(dbgi, mode, entity->function.irentity);
1580                 }
1581         }
1582
1583         case DECLARATION_KIND_COMPOUND_MEMBER:
1584                 panic("not implemented reference type");
1585         }
1586
1587         panic("reference to declaration with unknown type found");
1588 }
1589
1590 static ir_node *reference_expression_to_firm(const reference_expression_t *ref)
1591 {
1592         dbg_info *const dbgi   = get_dbg_info(&ref->base.source_position);
1593         entity_t *const entity = ref->entity;
1594         assert(is_declaration(entity));
1595
1596         switch ((declaration_kind_t)entity->declaration.kind) {
1597         case DECLARATION_KIND_LOCAL_VARIABLE:
1598         case DECLARATION_KIND_PARAMETER: {
1599                 type_t  *const type  = skip_typeref(entity->declaration.type);
1600                 ir_mode *const mode  = get_ir_mode_storage(type);
1601                 ir_node *const value = get_value(entity->variable.v.value_number, mode);
1602                 return create_conv(dbgi, value, get_ir_mode_arithmetic(type));
1603         }
1604
1605         default: {
1606                 ir_node *const addr = reference_addr(ref);
1607                 return deref_address(dbgi, entity->declaration.type, addr);
1608         }
1609         }
1610 }
1611
1612 /**
1613  * Transform calls to builtin functions.
1614  */
1615 static ir_node *process_builtin_call(const call_expression_t *call)
1616 {
1617         dbg_info *dbgi = get_dbg_info(&call->base.source_position);
1618
1619         assert(call->function->kind == EXPR_REFERENCE);
1620         reference_expression_t *builtin = &call->function->reference;
1621
1622         type_t *expr_type = skip_typeref(builtin->base.type);
1623         assert(is_type_pointer(expr_type));
1624
1625         type_t *function_type = skip_typeref(expr_type->pointer.points_to);
1626
1627         switch (builtin->entity->function.btk) {
1628         case BUILTIN_NONE:
1629                 break;
1630         case BUILTIN_ALLOCA: {
1631                 expression_t *argument = call->arguments->expression;
1632                 ir_node      *size     = expression_to_firm(argument);
1633
1634                 ir_node *store  = get_store();
1635                 ir_node *alloca = new_d_Alloc(dbgi, store, size, get_unknown_type(),
1636                                               stack_alloc);
1637                 ir_node *proj_m = new_Proj(alloca, mode_M, pn_Alloc_M);
1638                 set_store(proj_m);
1639                 ir_node *res    = new_Proj(alloca, mode_P_data, pn_Alloc_res);
1640
1641                 return res;
1642         }
1643         case BUILTIN_INF: {
1644                 type_t    *type = function_type->function.return_type;
1645                 ir_mode   *mode = get_ir_mode_arithmetic(type);
1646                 ir_tarval *tv   = get_mode_infinite(mode);
1647                 ir_node   *res  = new_d_Const(dbgi, tv);
1648                 return res;
1649         }
1650         case BUILTIN_NAN: {
1651                 /* Ignore string for now... */
1652                 assert(is_type_function(function_type));
1653                 type_t    *type = function_type->function.return_type;
1654                 ir_mode   *mode = get_ir_mode_arithmetic(type);
1655                 ir_tarval *tv   = get_mode_NAN(mode);
1656                 ir_node   *res  = new_d_Const(dbgi, tv);
1657                 return res;
1658         }
1659         case BUILTIN_EXPECT: {
1660                 expression_t *argument = call->arguments->expression;
1661                 return _expression_to_firm(argument);
1662         }
1663         case BUILTIN_VA_END:
1664                 /* evaluate the argument of va_end for its side effects */
1665                 _expression_to_firm(call->arguments->expression);
1666                 return NULL;
1667         case BUILTIN_OBJECT_SIZE: {
1668                 /* determine value of "type" */
1669                 expression_t *type_expression = call->arguments->next->expression;
1670                 long          type_val        = fold_constant_to_int(type_expression);
1671                 type_t       *type            = function_type->function.return_type;
1672                 ir_mode      *mode            = get_ir_mode_arithmetic(type);
1673                 /* just produce a "I don't know" result */
1674                 ir_tarval    *result          = type_val & 2 ? get_mode_null(mode) :
1675                                                 get_mode_minus_one(mode);
1676
1677                 return new_d_Const(dbgi, result);
1678         }
1679         case BUILTIN_ROTL: {
1680                 ir_node *val  = expression_to_firm(call->arguments->expression);
1681                 ir_node *shf  = expression_to_firm(call->arguments->next->expression);
1682                 ir_mode *mode = get_irn_mode(val);
1683                 ir_mode *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1684                 return new_d_Rotl(dbgi, val, create_conv(dbgi, shf, mode_uint), mode);
1685         }
1686         case BUILTIN_ROTR: {
1687                 ir_node *val  = expression_to_firm(call->arguments->expression);
1688                 ir_node *shf  = expression_to_firm(call->arguments->next->expression);
1689                 ir_mode *mode = get_irn_mode(val);
1690                 ir_mode *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1691                 ir_node *c    = new_Const_long(mode_uint, get_mode_size_bits(mode));
1692                 ir_node *sub  = new_d_Sub(dbgi, c, create_conv(dbgi, shf, mode_uint), mode_uint);
1693                 return new_d_Rotl(dbgi, val, sub, mode);
1694         }
1695         case BUILTIN_FIRM:
1696                 break;
1697         case BUILTIN_LIBC:
1698         case BUILTIN_LIBC_CHECK:
1699                 panic("builtin did not produce an entity");
1700         }
1701         panic("invalid builtin found");
1702 }
1703
1704 /**
1705  * Transform a call expression.
1706  * Handles some special cases, like alloca() calls, which must be resolved
1707  * BEFORE the inlines runs. Inlining routines calling alloca() is dangerous,
1708  * 176.gcc for instance might allocate 2GB instead of 256 MB if alloca is not
1709  * handled right...
1710  */
1711 static ir_node *call_expression_to_firm(const call_expression_t *const call)
1712 {
1713         dbg_info *const dbgi = get_dbg_info(&call->base.source_position);
1714         assert(currently_reachable());
1715
1716         expression_t   *function = call->function;
1717         ir_node        *callee   = NULL;
1718         bool            firm_builtin = false;
1719         ir_builtin_kind firm_builtin_kind = ir_bk_trap;
1720         if (function->kind == EXPR_REFERENCE) {
1721                 const reference_expression_t *ref    = &function->reference;
1722                 entity_t                     *entity = ref->entity;
1723
1724                 if (entity->kind == ENTITY_FUNCTION) {
1725                         builtin_kind_t builtin = entity->function.btk;
1726                         if (builtin == BUILTIN_FIRM) {
1727                                 firm_builtin = true;
1728                                 firm_builtin_kind = entity->function.b.firm_builtin_kind;
1729                         } else if (builtin != BUILTIN_NONE && builtin != BUILTIN_LIBC
1730                                    && builtin != BUILTIN_LIBC_CHECK) {
1731                                 return process_builtin_call(call);
1732                         }
1733                 }
1734         }
1735         if (!firm_builtin)
1736                 callee = expression_to_firm(function);
1737
1738         type_t *type = skip_typeref(function->base.type);
1739         assert(is_type_pointer(type));
1740         pointer_type_t *pointer_type = &type->pointer;
1741         type_t         *points_to    = skip_typeref(pointer_type->points_to);
1742         assert(is_type_function(points_to));
1743         function_type_t *function_type = &points_to->function;
1744
1745         int      n_parameters    = 0;
1746         ir_type *ir_method_type  = get_ir_type((type_t*) function_type);
1747         ir_type *new_method_type = NULL;
1748         if (function_type->variadic || function_type->unspecified_parameters) {
1749                 const call_argument_t *argument = call->arguments;
1750                 for ( ; argument != NULL; argument = argument->next) {
1751                         ++n_parameters;
1752                 }
1753
1754                 /* we need to construct a new method type matching the call
1755                  * arguments... */
1756                 type_dbg_info *tdbgi = get_type_dbg_info_((const type_t*) function_type);
1757                 int n_res       = get_method_n_ress(ir_method_type);
1758                 new_method_type = new_d_type_method(n_parameters, n_res, tdbgi);
1759                 set_method_calling_convention(new_method_type,
1760                                get_method_calling_convention(ir_method_type));
1761                 set_method_additional_properties(new_method_type,
1762                                get_method_additional_properties(ir_method_type));
1763                 set_method_variadicity(new_method_type,
1764                                        get_method_variadicity(ir_method_type));
1765
1766                 for (int i = 0; i < n_res; ++i) {
1767                         set_method_res_type(new_method_type, i,
1768                                             get_method_res_type(ir_method_type, i));
1769                 }
1770                 argument = call->arguments;
1771                 for (int i = 0; i < n_parameters; ++i, argument = argument->next) {
1772                         expression_t *expression = argument->expression;
1773                         ir_type      *irtype     = get_ir_type(expression->base.type);
1774                         set_method_param_type(new_method_type, i, irtype);
1775                 }
1776                 ir_method_type = new_method_type;
1777         } else {
1778                 n_parameters = get_method_n_params(ir_method_type);
1779         }
1780
1781         ir_node *in[n_parameters];
1782
1783         const call_argument_t *argument = call->arguments;
1784         for (int n = 0; n < n_parameters; ++n) {
1785                 expression_t *expression = argument->expression;
1786                 ir_node      *arg_node   = expression_to_firm(expression);
1787
1788                 type_t *arg_type = skip_typeref(expression->base.type);
1789                 if (!is_type_compound(arg_type)) {
1790                         ir_mode *const mode = get_ir_mode_storage(arg_type);
1791                         arg_node = create_conv(dbgi, arg_node, mode);
1792                         arg_node = do_strict_conv(dbgi, arg_node);
1793                 }
1794
1795                 in[n] = arg_node;
1796
1797                 argument = argument->next;
1798         }
1799
1800         ir_node *store;
1801         if (function_type->modifiers & DM_CONST) {
1802                 store = get_irg_no_mem(current_ir_graph);
1803         } else {
1804                 store = get_store();
1805         }
1806
1807         ir_node *node;
1808         type_t  *return_type = skip_typeref(function_type->return_type);
1809         ir_node *result      = NULL;
1810         if (firm_builtin) {
1811                 node = new_d_Builtin(dbgi, store, n_parameters, in, firm_builtin_kind,
1812                                      ir_method_type);
1813                 if (! (function_type->modifiers & DM_CONST)) {
1814                         ir_node *mem = new_Proj(node, mode_M, pn_Builtin_M);
1815                         set_store(mem);
1816                 }
1817
1818                 if (!is_type_void(return_type)) {
1819                         assert(is_type_scalar(return_type));
1820                         ir_mode *mode = get_ir_mode_storage(return_type);
1821                         result = new_Proj(node, mode, pn_Builtin_max+1);
1822                         ir_mode *mode_arith = get_ir_mode_arithmetic(return_type);
1823                         result              = create_conv(NULL, result, mode_arith);
1824                 }
1825         } else {
1826                 node = new_d_Call(dbgi, store, callee, n_parameters, in, ir_method_type);
1827                 if (! (function_type->modifiers & DM_CONST)) {
1828                         ir_node *mem = new_Proj(node, mode_M, pn_Call_M);
1829                         set_store(mem);
1830                 }
1831
1832                 if (!is_type_void(return_type)) {
1833                         ir_node *const resproj    = new_Proj(node, mode_T, pn_Call_T_result);
1834                         ir_mode *const mode       = get_ir_mode_storage(return_type);
1835                         result                    = new_Proj(resproj, mode, 0);
1836                         ir_mode *const mode_arith = get_ir_mode_arithmetic(return_type);
1837                         result                    = create_conv(NULL, result, mode_arith);
1838                 }
1839         }
1840
1841         if (function_type->modifiers & DM_NORETURN) {
1842                 /* A dead end:  Keep the Call and the Block.  Also place all further
1843                  * nodes into a new and unreachable block. */
1844                 keep_alive(node);
1845                 keep_alive(get_cur_block());
1846                 ir_node *block = new_Block(0, NULL);
1847                 set_cur_block(block);
1848         }
1849
1850         return result;
1851 }
1852
1853 static ir_node *statement_to_firm(statement_t *statement);
1854 static ir_node *compound_statement_to_firm(compound_statement_t *compound);
1855
1856 static ir_node *expression_to_addr(const expression_t *expression);
1857 static ir_node *create_condition_evaluation(const expression_t *expression,
1858                                             ir_node *true_block,
1859                                             ir_node *false_block);
1860
1861 static void assign_value(dbg_info *dbgi, ir_node *addr, type_t *type,
1862                          ir_node *value)
1863 {
1864         if (!is_type_compound(type)) {
1865                 ir_mode *mode = get_ir_mode_storage(type);
1866                 value         = create_conv(dbgi, value, mode);
1867                 value         = do_strict_conv(dbgi, value);
1868         }
1869
1870         ir_node *memory = get_store();
1871
1872         if (is_type_scalar(type)) {
1873                 ir_cons_flags flags = type->base.qualifiers & TYPE_QUALIFIER_VOLATILE
1874                                       ? cons_volatile : cons_none;
1875                 ir_node  *store     = new_d_Store(dbgi, memory, addr, value, flags);
1876                 ir_node  *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
1877                 set_store(store_mem);
1878         } else {
1879                 ir_type *irtype    = get_ir_type(type);
1880                 ir_node *copyb     = new_d_CopyB(dbgi, memory, addr, value, irtype);
1881                 ir_node *copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
1882                 set_store(copyb_mem);
1883         }
1884 }
1885
1886 static ir_tarval *create_bitfield_mask(ir_mode *mode, int offset, int size)
1887 {
1888         ir_tarval *all_one   = get_mode_all_one(mode);
1889         int        mode_size = get_mode_size_bits(mode);
1890         ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1891
1892         assert(offset >= 0);
1893         assert(size   >= 0);
1894         assert(offset + size <= mode_size);
1895         if (size == mode_size) {
1896                 return all_one;
1897         }
1898
1899         long       shiftr    = get_mode_size_bits(mode) - size;
1900         long       shiftl    = offset;
1901         ir_tarval *tv_shiftr = new_tarval_from_long(shiftr, mode_uint);
1902         ir_tarval *tv_shiftl = new_tarval_from_long(shiftl, mode_uint);
1903         ir_tarval *mask0     = tarval_shr(all_one, tv_shiftr);
1904         ir_tarval *mask1     = tarval_shl(mask0, tv_shiftl);
1905
1906         return mask1;
1907 }
1908
1909 static ir_node *bitfield_store_to_firm(dbg_info *dbgi,
1910                 ir_entity *entity, ir_node *addr, ir_node *value, bool set_volatile,
1911                 bool need_return)
1912 {
1913         ir_type *entity_type = get_entity_type(entity);
1914         ir_type *base_type   = get_primitive_base_type(entity_type);
1915         ir_mode *mode        = get_type_mode(base_type);
1916         ir_mode *mode_uint   = atomic_modes[ATOMIC_TYPE_UINT];
1917
1918         value = create_conv(dbgi, value, mode);
1919
1920         /* kill upper bits of value and shift to right position */
1921         unsigned  bitoffset  = get_entity_offset_bits_remainder(entity);
1922         unsigned  bitsize    = get_mode_size_bits(get_type_mode(entity_type));
1923         unsigned  base_bits  = get_mode_size_bits(mode);
1924         unsigned  shiftwidth = base_bits - bitsize;
1925
1926         ir_node  *shiftcount = new_Const_long(mode_uint, shiftwidth);
1927         ir_node  *shiftl     = new_d_Shl(dbgi, value, shiftcount, mode);
1928
1929         unsigned  shrwidth   = base_bits - bitsize - bitoffset;
1930         ir_node  *shrconst   = new_Const_long(mode_uint, shrwidth);
1931         ir_node  *shiftr     = new_d_Shr(dbgi, shiftl, shrconst, mode);
1932
1933         /* load current value */
1934         ir_node   *mem             = get_store();
1935         ir_node   *load            = new_d_Load(dbgi, mem, addr, mode,
1936                                           set_volatile ? cons_volatile : cons_none);
1937         ir_node   *load_mem        = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1938         ir_node   *load_res        = new_d_Proj(dbgi, load, mode, pn_Load_res);
1939         ir_tarval *shift_mask      = create_bitfield_mask(mode, bitoffset, bitsize);
1940         ir_tarval *inv_mask        = tarval_not(shift_mask);
1941         ir_node   *inv_mask_node   = new_d_Const(dbgi, inv_mask);
1942         ir_node   *load_res_masked = new_d_And(dbgi, load_res, inv_mask_node, mode);
1943
1944         /* construct new value and store */
1945         ir_node *new_val   = new_d_Or(dbgi, load_res_masked, shiftr, mode);
1946         ir_node *store     = new_d_Store(dbgi, load_mem, addr, new_val,
1947                                          set_volatile ? cons_volatile : cons_none);
1948         ir_node *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
1949         set_store(store_mem);
1950
1951         if (!need_return)
1952                 return NULL;
1953
1954         ir_node *res_shr;
1955         ir_node *count_res_shr = new_Const_long(mode_uint, base_bits - bitsize);
1956         if (mode_is_signed(mode)) {
1957                 res_shr = new_d_Shrs(dbgi, shiftl, count_res_shr, mode);
1958         } else {
1959                 res_shr = new_d_Shr(dbgi, shiftl, count_res_shr, mode);
1960         }
1961         return res_shr;
1962 }
1963
1964 static ir_node *bitfield_extract_to_firm(const select_expression_t *expression,
1965                                          ir_node *addr)
1966 {
1967         dbg_info *dbgi      = get_dbg_info(&expression->base.source_position);
1968         entity_t *entity    = expression->compound_entry;
1969         type_t   *base_type = entity->declaration.type;
1970         ir_mode  *mode      = get_ir_mode_storage(base_type);
1971         ir_node  *mem       = get_store();
1972         ir_node  *load      = new_d_Load(dbgi, mem, addr, mode, cons_none);
1973         ir_node  *load_mem  = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1974         ir_node  *load_res  = new_d_Proj(dbgi, load, mode, pn_Load_res);
1975         ir_mode  *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1976
1977         ir_mode  *amode     = mode;
1978         /* optimisation, since shifting in modes < machine_size is usually
1979          * less efficient */
1980         if (get_mode_size_bits(amode) < get_mode_size_bits(mode_uint)) {
1981                 amode = mode_uint;
1982         }
1983         unsigned amode_size = get_mode_size_bits(amode);
1984         load_res = create_conv(dbgi, load_res, amode);
1985
1986         set_store(load_mem);
1987
1988         /* kill upper bits */
1989         assert(expression->compound_entry->kind == ENTITY_COMPOUND_MEMBER);
1990         unsigned   bitoffset   = entity->compound_member.bit_offset;
1991         unsigned   bitsize     = entity->compound_member.bit_size;
1992         unsigned   shift_bitsl = amode_size - bitoffset - bitsize;
1993         ir_tarval *tvl         = new_tarval_from_long((long)shift_bitsl, mode_uint);
1994         ir_node   *countl      = new_d_Const(dbgi, tvl);
1995         ir_node   *shiftl      = new_d_Shl(dbgi, load_res, countl, amode);
1996
1997         unsigned   shift_bitsr = bitoffset + shift_bitsl;
1998         assert(shift_bitsr <= amode_size);
1999         ir_tarval *tvr         = new_tarval_from_long((long)shift_bitsr, mode_uint);
2000         ir_node   *countr      = new_d_Const(dbgi, tvr);
2001         ir_node   *shiftr;
2002         if (mode_is_signed(mode)) {
2003                 shiftr = new_d_Shrs(dbgi, shiftl, countr, amode);
2004         } else {
2005                 shiftr = new_d_Shr(dbgi, shiftl, countr, amode);
2006         }
2007
2008         type_t  *type    = expression->base.type;
2009         ir_mode *resmode = get_ir_mode_arithmetic(type);
2010         return create_conv(dbgi, shiftr, resmode);
2011 }
2012
2013 /* make sure the selected compound type is constructed */
2014 static void construct_select_compound(const select_expression_t *expression)
2015 {
2016         type_t *type = skip_typeref(expression->compound->base.type);
2017         if (is_type_pointer(type)) {
2018                 type = type->pointer.points_to;
2019         }
2020         (void) get_ir_type(type);
2021 }
2022
2023 static ir_node *set_value_for_expression_addr(const expression_t *expression,
2024                                               ir_node *value, ir_node *addr)
2025 {
2026         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2027         type_t   *type = skip_typeref(expression->base.type);
2028
2029         if (!is_type_compound(type)) {
2030                 ir_mode  *mode = get_ir_mode_storage(type);
2031                 value          = create_conv(dbgi, value, mode);
2032                 value          = do_strict_conv(dbgi, value);
2033         }
2034
2035         if (expression->kind == EXPR_REFERENCE) {
2036                 const reference_expression_t *ref = &expression->reference;
2037
2038                 entity_t *entity = ref->entity;
2039                 assert(is_declaration(entity));
2040                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2041                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE ||
2042                     entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
2043                         set_value(entity->variable.v.value_number, value);
2044                         return value;
2045                 }
2046         }
2047
2048         if (addr == NULL)
2049                 addr = expression_to_addr(expression);
2050         assert(addr != NULL);
2051
2052         if (expression->kind == EXPR_SELECT) {
2053                 const select_expression_t *select = &expression->select;
2054
2055                 construct_select_compound(select);
2056
2057                 entity_t *entity = select->compound_entry;
2058                 assert(entity->kind == ENTITY_COMPOUND_MEMBER);
2059                 if (entity->compound_member.bitfield) {
2060                         ir_entity *irentity = entity->compound_member.entity;
2061                         bool       set_volatile
2062                                 = select->base.type->base.qualifiers & TYPE_QUALIFIER_VOLATILE;
2063                         value = bitfield_store_to_firm(dbgi, irentity, addr, value,
2064                                                        set_volatile, true);
2065                         return value;
2066                 }
2067         }
2068
2069         assign_value(dbgi, addr, type, value);
2070         return value;
2071 }
2072
2073 static void set_value_for_expression(const expression_t *expression,
2074                                      ir_node *value)
2075 {
2076         set_value_for_expression_addr(expression, value, NULL);
2077 }
2078
2079 static ir_node *get_value_from_lvalue(const expression_t *expression,
2080                                       ir_node *addr)
2081 {
2082         if (expression->kind == EXPR_REFERENCE) {
2083                 const reference_expression_t *ref = &expression->reference;
2084
2085                 entity_t *entity = ref->entity;
2086                 assert(entity->kind == ENTITY_VARIABLE
2087                                 || entity->kind == ENTITY_PARAMETER);
2088                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2089                 int value_number;
2090                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE ||
2091                     entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
2092                         value_number = entity->variable.v.value_number;
2093                         assert(addr == NULL);
2094                         type_t  *type = skip_typeref(expression->base.type);
2095                         ir_mode *mode = get_ir_mode_storage(type);
2096                         ir_node *res  = get_value(value_number, mode);
2097                         return create_conv(NULL, res, get_ir_mode_arithmetic(type));
2098                 }
2099         }
2100
2101         assert(addr != NULL);
2102         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2103
2104         ir_node *value;
2105         if (expression->kind == EXPR_SELECT &&
2106             expression->select.compound_entry->compound_member.bitfield) {
2107             construct_select_compound(&expression->select);
2108                 value = bitfield_extract_to_firm(&expression->select, addr);
2109         } else {
2110                 value = deref_address(dbgi, expression->base.type, addr);
2111         }
2112
2113         return value;
2114 }
2115
2116
2117 static ir_node *create_incdec(const unary_expression_t *expression)
2118 {
2119         dbg_info *const     dbgi = get_dbg_info(&expression->base.source_position);
2120         const expression_t *value_expr = expression->value;
2121         ir_node            *addr       = expression_to_addr(value_expr);
2122         ir_node            *value      = get_value_from_lvalue(value_expr, addr);
2123
2124         type_t  *type = skip_typeref(expression->base.type);
2125         ir_mode *mode = get_ir_mode_arithmetic(expression->base.type);
2126
2127         ir_node *offset;
2128         if (is_type_pointer(type)) {
2129                 pointer_type_t *pointer_type = &type->pointer;
2130                 offset = get_type_size_node(pointer_type->points_to);
2131         } else {
2132                 assert(is_type_arithmetic(type));
2133                 offset = new_Const(get_mode_one(mode));
2134         }
2135
2136         ir_node *result;
2137         ir_node *store_value;
2138         switch(expression->base.kind) {
2139         case EXPR_UNARY_POSTFIX_INCREMENT:
2140                 result      = value;
2141                 store_value = new_d_Add(dbgi, value, offset, mode);
2142                 break;
2143         case EXPR_UNARY_POSTFIX_DECREMENT:
2144                 result      = value;
2145                 store_value = new_d_Sub(dbgi, value, offset, mode);
2146                 break;
2147         case EXPR_UNARY_PREFIX_INCREMENT:
2148                 result      = new_d_Add(dbgi, value, offset, mode);
2149                 store_value = result;
2150                 break;
2151         case EXPR_UNARY_PREFIX_DECREMENT:
2152                 result      = new_d_Sub(dbgi, value, offset, mode);
2153                 store_value = result;
2154                 break;
2155         default:
2156                 panic("no incdec expr in create_incdec");
2157         }
2158
2159         set_value_for_expression_addr(value_expr, store_value, addr);
2160
2161         return result;
2162 }
2163
2164 static bool is_local_variable(expression_t *expression)
2165 {
2166         if (expression->kind != EXPR_REFERENCE)
2167                 return false;
2168         reference_expression_t *ref_expr = &expression->reference;
2169         entity_t               *entity   = ref_expr->entity;
2170         if (entity->kind != ENTITY_VARIABLE)
2171                 return false;
2172         assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2173         return entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE;
2174 }
2175
2176 static ir_relation get_relation(const expression_kind_t kind)
2177 {
2178         switch(kind) {
2179         case EXPR_BINARY_EQUAL:         return ir_relation_equal;
2180         case EXPR_BINARY_ISLESSGREATER: return ir_relation_less_greater;
2181         case EXPR_BINARY_NOTEQUAL:      return ir_relation_unordered_less_greater;
2182         case EXPR_BINARY_ISLESS:
2183         case EXPR_BINARY_LESS:          return ir_relation_less;
2184         case EXPR_BINARY_ISLESSEQUAL:
2185         case EXPR_BINARY_LESSEQUAL:     return ir_relation_less_equal;
2186         case EXPR_BINARY_ISGREATER:
2187         case EXPR_BINARY_GREATER:       return ir_relation_greater;
2188         case EXPR_BINARY_ISGREATEREQUAL:
2189         case EXPR_BINARY_GREATEREQUAL:  return ir_relation_greater_equal;
2190         case EXPR_BINARY_ISUNORDERED:   return ir_relation_unordered;
2191
2192         default:
2193                 break;
2194         }
2195         panic("trying to get pn_Cmp from non-comparison binexpr type");
2196 }
2197
2198 /**
2199  * Handle the assume optimizer hint: check if a Confirm
2200  * node can be created.
2201  *
2202  * @param dbi    debug info
2203  * @param expr   the IL assume expression
2204  *
2205  * we support here only some simple cases:
2206  *  - var rel const
2207  *  - const rel val
2208  *  - var rel var
2209  */
2210 static ir_node *handle_assume_compare(dbg_info *dbi,
2211                                       const binary_expression_t *expression)
2212 {
2213         expression_t *op1 = expression->left;
2214         expression_t *op2 = expression->right;
2215         entity_t     *var2, *var = NULL;
2216         ir_node      *res      = NULL;
2217         ir_relation   relation = get_relation(expression->base.kind);
2218
2219         if (is_local_variable(op1) && is_local_variable(op2)) {
2220                 var  = op1->reference.entity;
2221             var2 = op2->reference.entity;
2222
2223                 type_t  *const type = skip_typeref(var->declaration.type);
2224                 ir_mode *const mode = get_ir_mode_storage(type);
2225
2226                 ir_node *const irn1 = get_value(var->variable.v.value_number, mode);
2227                 ir_node *const irn2 = get_value(var2->variable.v.value_number, mode);
2228
2229                 res = new_d_Confirm(dbi, irn2, irn1, get_inversed_relation(relation));
2230                 set_value(var2->variable.v.value_number, res);
2231
2232                 res = new_d_Confirm(dbi, irn1, irn2, relation);
2233                 set_value(var->variable.v.value_number, res);
2234
2235                 return res;
2236         }
2237
2238         expression_t *con = NULL;
2239         if (is_local_variable(op1) && is_constant_expression(op2) == EXPR_CLASS_CONSTANT) {
2240                 var = op1->reference.entity;
2241                 con = op2;
2242         } else if (is_constant_expression(op1) == EXPR_CLASS_CONSTANT && is_local_variable(op2)) {
2243                 relation = get_inversed_relation(relation);
2244                 var = op2->reference.entity;
2245                 con = op1;
2246         }
2247
2248         if (var != NULL) {
2249                 type_t  *const type = skip_typeref(var->declaration.type);
2250                 ir_mode *const mode = get_ir_mode_storage(type);
2251
2252                 res = get_value(var->variable.v.value_number, mode);
2253                 res = new_d_Confirm(dbi, res, expression_to_firm(con), relation);
2254                 set_value(var->variable.v.value_number, res);
2255         }
2256         return res;
2257 }
2258
2259 /**
2260  * Handle the assume optimizer hint.
2261  *
2262  * @param dbi    debug info
2263  * @param expr   the IL assume expression
2264  */
2265 static ir_node *handle_assume(dbg_info *dbi, const expression_t *expression)
2266 {
2267         switch(expression->kind) {
2268         case EXPR_BINARY_EQUAL:
2269         case EXPR_BINARY_NOTEQUAL:
2270         case EXPR_BINARY_LESS:
2271         case EXPR_BINARY_LESSEQUAL:
2272         case EXPR_BINARY_GREATER:
2273         case EXPR_BINARY_GREATEREQUAL:
2274                 return handle_assume_compare(dbi, &expression->binary);
2275         default:
2276                 return NULL;
2277         }
2278 }
2279
2280 static ir_node *create_cast(dbg_info *dbgi, ir_node *value_node,
2281                             type_t *from_type, type_t *type)
2282 {
2283         type = skip_typeref(type);
2284         if (is_type_void(type)) {
2285                 /* make sure firm type is constructed */
2286                 (void) get_ir_type(type);
2287                 return NULL;
2288         }
2289         if (!is_type_scalar(type)) {
2290                 /* make sure firm type is constructed */
2291                 (void) get_ir_type(type);
2292                 return value_node;
2293         }
2294
2295         from_type     = skip_typeref(from_type);
2296         ir_mode *mode = get_ir_mode_storage(type);
2297         /* check for conversion from / to __based types */
2298         if (is_type_pointer(type) && is_type_pointer(from_type)) {
2299                 const variable_t *from_var = from_type->pointer.base_variable;
2300                 const variable_t *to_var   = type->pointer.base_variable;
2301                 if (from_var != to_var) {
2302                         if (from_var != NULL) {
2303                                 ir_node *const addr = create_symconst(dbgi, from_var->v.entity);
2304                                 ir_node *const base = deref_address(dbgi, from_var->base.type, addr);
2305                                 value_node = new_d_Add(dbgi, value_node, base, mode);
2306                         }
2307                         if (to_var != NULL) {
2308                                 ir_node *const addr = create_symconst(dbgi, to_var->v.entity);
2309                                 ir_node *const base = deref_address(dbgi, to_var->base.type, addr);
2310                                 value_node = new_d_Sub(dbgi, value_node, base, mode);
2311                         }
2312                 }
2313         }
2314
2315         if (is_type_atomic(type, ATOMIC_TYPE_BOOL)) {
2316                 /* bool adjustments (we save a mode_Bu, but have to temporarily
2317                  * convert to mode_b so we only get a 0/1 value */
2318                 value_node = create_conv(dbgi, value_node, mode_b);
2319         }
2320
2321         ir_mode *mode_arith = get_ir_mode_arithmetic(type);
2322         ir_node *node       = create_conv(dbgi, value_node, mode);
2323         node                = do_strict_conv(dbgi, node);
2324         node                = create_conv(dbgi, node, mode_arith);
2325
2326         return node;
2327 }
2328
2329 static ir_node *unary_expression_to_firm(const unary_expression_t *expression)
2330 {
2331         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2332         type_t   *type = skip_typeref(expression->base.type);
2333
2334         const expression_t *value = expression->value;
2335
2336         switch(expression->base.kind) {
2337         case EXPR_UNARY_TAKE_ADDRESS:
2338                 return expression_to_addr(value);
2339
2340         case EXPR_UNARY_NEGATE: {
2341                 ir_node *value_node = expression_to_firm(value);
2342                 ir_mode *mode       = get_ir_mode_arithmetic(type);
2343                 return new_d_Minus(dbgi, value_node, mode);
2344         }
2345         case EXPR_UNARY_PLUS:
2346                 return expression_to_firm(value);
2347         case EXPR_UNARY_BITWISE_NEGATE: {
2348                 ir_node *value_node = expression_to_firm(value);
2349                 ir_mode *mode       = get_ir_mode_arithmetic(type);
2350                 return new_d_Not(dbgi, value_node, mode);
2351         }
2352         case EXPR_UNARY_NOT: {
2353                 ir_node *value_node = _expression_to_firm(value);
2354                 value_node          = create_conv(dbgi, value_node, mode_b);
2355                 ir_node *res        = new_d_Not(dbgi, value_node, mode_b);
2356                 return res;
2357         }
2358         case EXPR_UNARY_DEREFERENCE: {
2359                 ir_node *value_node = expression_to_firm(value);
2360                 type_t  *value_type = skip_typeref(value->base.type);
2361                 assert(is_type_pointer(value_type));
2362
2363                 /* check for __based */
2364                 const variable_t *const base_var = value_type->pointer.base_variable;
2365                 if (base_var != NULL) {
2366                         ir_node *const addr = create_symconst(dbgi, base_var->v.entity);
2367                         ir_node *const base = deref_address(dbgi, base_var->base.type, addr);
2368                         value_node = new_d_Add(dbgi, value_node, base, get_ir_mode_storage(value_type));
2369                 }
2370                 type_t  *points_to  = value_type->pointer.points_to;
2371                 return deref_address(dbgi, points_to, value_node);
2372         }
2373         case EXPR_UNARY_POSTFIX_INCREMENT:
2374         case EXPR_UNARY_POSTFIX_DECREMENT:
2375         case EXPR_UNARY_PREFIX_INCREMENT:
2376         case EXPR_UNARY_PREFIX_DECREMENT:
2377                 return create_incdec(expression);
2378         case EXPR_UNARY_CAST: {
2379                 ir_node *value_node = expression_to_firm(value);
2380                 type_t  *from_type  = value->base.type;
2381                 return create_cast(dbgi, value_node, from_type, type);
2382         }
2383         case EXPR_UNARY_ASSUME:
2384                 return handle_assume(dbgi, value);
2385
2386         default:
2387                 break;
2388         }
2389         panic("invalid UNEXPR type found");
2390 }
2391
2392 /**
2393  * produces a 0/1 depending of the value of a mode_b node
2394  */
2395 static ir_node *produce_condition_result(const expression_t *expression,
2396                                          ir_mode *mode, dbg_info *dbgi)
2397 {
2398         ir_node *const one_block  = new_immBlock();
2399         ir_node *const zero_block = new_immBlock();
2400         create_condition_evaluation(expression, one_block, zero_block);
2401         mature_immBlock(one_block);
2402         mature_immBlock(zero_block);
2403
2404         ir_node *const jmp_one  = new_rd_Jmp(dbgi, one_block);
2405         ir_node *const jmp_zero = new_rd_Jmp(dbgi, zero_block);
2406         ir_node *const in_cf[2] = { jmp_one, jmp_zero };
2407         ir_node *const block    = new_Block(lengthof(in_cf), in_cf);
2408         set_cur_block(block);
2409
2410         ir_node *const one   = new_Const(get_mode_one(mode));
2411         ir_node *const zero  = new_Const(get_mode_null(mode));
2412         ir_node *const in[2] = { one, zero };
2413         ir_node *const val   = new_d_Phi(dbgi, lengthof(in), in, mode);
2414
2415         return val;
2416 }
2417
2418 static ir_node *adjust_for_pointer_arithmetic(dbg_info *dbgi,
2419                 ir_node *value, type_t *type)
2420 {
2421         ir_mode        *const mode         = get_ir_mode_arithmetic(type_ptrdiff_t);
2422         assert(is_type_pointer(type));
2423         pointer_type_t *const pointer_type = &type->pointer;
2424         type_t         *const points_to    = skip_typeref(pointer_type->points_to);
2425         ir_node        *      elem_size    = get_type_size_node(points_to);
2426         elem_size                          = create_conv(dbgi, elem_size, mode);
2427         value                              = create_conv(dbgi, value,     mode);
2428         ir_node        *const mul          = new_d_Mul(dbgi, value, elem_size, mode);
2429         return mul;
2430 }
2431
2432 static ir_node *create_op(dbg_info *dbgi, const binary_expression_t *expression,
2433                           ir_node *left, ir_node *right)
2434 {
2435         ir_mode  *mode;
2436         type_t   *type_left  = skip_typeref(expression->left->base.type);
2437         type_t   *type_right = skip_typeref(expression->right->base.type);
2438
2439         expression_kind_t kind = expression->base.kind;
2440
2441         switch (kind) {
2442         case EXPR_BINARY_SHIFTLEFT:
2443         case EXPR_BINARY_SHIFTRIGHT:
2444         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2445         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2446                 mode  = get_ir_mode_arithmetic(expression->base.type);
2447                 right = create_conv(dbgi, right, atomic_modes[ATOMIC_TYPE_UINT]);
2448                 break;
2449
2450         case EXPR_BINARY_SUB:
2451                 if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
2452                         const pointer_type_t *const ptr_type = &type_left->pointer;
2453
2454                         mode = get_ir_mode_arithmetic(expression->base.type);
2455                         ir_node *const elem_size = get_type_size_node(ptr_type->points_to);
2456                         ir_node *const conv_size = new_d_Conv(dbgi, elem_size, mode);
2457                         ir_node *const sub       = new_d_Sub(dbgi, left, right, mode);
2458                         ir_node *const no_mem    = new_NoMem();
2459                         ir_node *const div       = new_d_DivRL(dbgi, no_mem, sub, conv_size,
2460                                                                                                    mode, op_pin_state_floats);
2461                         return new_d_Proj(dbgi, div, mode, pn_Div_res);
2462                 }
2463                 /* fallthrough */
2464         case EXPR_BINARY_SUB_ASSIGN:
2465                 if (is_type_pointer(type_left)) {
2466                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2467                         mode  = get_ir_mode_arithmetic(type_left);
2468                         break;
2469                 }
2470                 goto normal_node;
2471
2472         case EXPR_BINARY_ADD:
2473         case EXPR_BINARY_ADD_ASSIGN:
2474                 if (is_type_pointer(type_left)) {
2475                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2476                         mode  = get_ir_mode_arithmetic(type_left);
2477                         break;
2478                 } else if (is_type_pointer(type_right)) {
2479                         left  = adjust_for_pointer_arithmetic(dbgi, left, type_right);
2480                         mode  = get_ir_mode_arithmetic(type_right);
2481                         break;
2482                 }
2483                 goto normal_node;
2484
2485         default:
2486 normal_node:
2487                 mode = get_ir_mode_arithmetic(type_right);
2488                 left = create_conv(dbgi, left, mode);
2489                 break;
2490         }
2491
2492         switch (kind) {
2493         case EXPR_BINARY_ADD_ASSIGN:
2494         case EXPR_BINARY_ADD:
2495                 return new_d_Add(dbgi, left, right, mode);
2496         case EXPR_BINARY_SUB_ASSIGN:
2497         case EXPR_BINARY_SUB:
2498                 return new_d_Sub(dbgi, left, right, mode);
2499         case EXPR_BINARY_MUL_ASSIGN:
2500         case EXPR_BINARY_MUL:
2501                 return new_d_Mul(dbgi, left, right, mode);
2502         case EXPR_BINARY_BITWISE_AND:
2503         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2504                 return new_d_And(dbgi, left, right, mode);
2505         case EXPR_BINARY_BITWISE_OR:
2506         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2507                 return new_d_Or(dbgi, left, right, mode);
2508         case EXPR_BINARY_BITWISE_XOR:
2509         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2510                 return new_d_Eor(dbgi, left, right, mode);
2511         case EXPR_BINARY_SHIFTLEFT:
2512         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2513                 return new_d_Shl(dbgi, left, right, mode);
2514         case EXPR_BINARY_SHIFTRIGHT:
2515         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2516                 if (mode_is_signed(mode)) {
2517                         return new_d_Shrs(dbgi, left, right, mode);
2518                 } else {
2519                         return new_d_Shr(dbgi, left, right, mode);
2520                 }
2521         case EXPR_BINARY_DIV:
2522         case EXPR_BINARY_DIV_ASSIGN: {
2523                 ir_node *pin = new_Pin(new_NoMem());
2524                 ir_node *op  = new_d_Div(dbgi, pin, left, right, mode,
2525                                          op_pin_state_floats);
2526                 ir_node *res = new_d_Proj(dbgi, op, mode, pn_Div_res);
2527                 return res;
2528         }
2529         case EXPR_BINARY_MOD:
2530         case EXPR_BINARY_MOD_ASSIGN: {
2531                 ir_node *pin = new_Pin(new_NoMem());
2532                 assert(!mode_is_float(mode));
2533                 ir_node *op  = new_d_Mod(dbgi, pin, left, right, mode,
2534                                          op_pin_state_floats);
2535                 ir_node *res = new_d_Proj(dbgi, op, mode, pn_Mod_res);
2536                 return res;
2537         }
2538         default:
2539                 panic("unexpected expression kind");
2540         }
2541 }
2542
2543 static ir_node *create_lazy_op(const binary_expression_t *expression)
2544 {
2545         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2546         type_t   *type = skip_typeref(expression->base.type);
2547         ir_mode  *mode = get_ir_mode_arithmetic(type);
2548
2549         if (is_constant_expression(expression->left) == EXPR_CLASS_CONSTANT) {
2550                 bool val = fold_constant_to_bool(expression->left);
2551                 expression_kind_t ekind = expression->base.kind;
2552                 assert(ekind == EXPR_BINARY_LOGICAL_AND || ekind == EXPR_BINARY_LOGICAL_OR);
2553                 if (ekind == EXPR_BINARY_LOGICAL_AND) {
2554                         if (!val) {
2555                                 return new_Const(get_mode_null(mode));
2556                         }
2557                 } else {
2558                         if (val) {
2559                                 return new_Const(get_mode_one(mode));
2560                         }
2561                 }
2562
2563                 if (is_constant_expression(expression->right) == EXPR_CLASS_CONSTANT) {
2564                         bool valr = fold_constant_to_bool(expression->right);
2565                         return create_Const_from_bool(mode, valr);
2566                 }
2567
2568                 return produce_condition_result(expression->right, mode, dbgi);
2569         }
2570
2571         return produce_condition_result((const expression_t*) expression, mode,
2572                                         dbgi);
2573 }
2574
2575 typedef ir_node * (*create_arithmetic_func)(dbg_info *dbgi, ir_node *left,
2576                                             ir_node *right, ir_mode *mode);
2577
2578 static ir_node *create_assign_binop(const binary_expression_t *expression)
2579 {
2580         dbg_info *const     dbgi = get_dbg_info(&expression->base.source_position);
2581         const expression_t *left_expr = expression->left;
2582         type_t             *type      = skip_typeref(left_expr->base.type);
2583         ir_node            *right     = expression_to_firm(expression->right);
2584         ir_node            *left_addr = expression_to_addr(left_expr);
2585         ir_node            *left      = get_value_from_lvalue(left_expr, left_addr);
2586         ir_node            *result    = create_op(dbgi, expression, left, right);
2587
2588         result = create_cast(dbgi, result, expression->right->base.type, type);
2589         result = do_strict_conv(dbgi, result);
2590
2591         result = set_value_for_expression_addr(left_expr, result, left_addr);
2592
2593         if (!is_type_compound(type)) {
2594                 ir_mode *mode_arithmetic = get_ir_mode_arithmetic(type);
2595                 result = create_conv(dbgi, result, mode_arithmetic);
2596         }
2597         return result;
2598 }
2599
2600 static ir_node *binary_expression_to_firm(const binary_expression_t *expression)
2601 {
2602         expression_kind_t kind = expression->base.kind;
2603
2604         switch(kind) {
2605         case EXPR_BINARY_EQUAL:
2606         case EXPR_BINARY_NOTEQUAL:
2607         case EXPR_BINARY_LESS:
2608         case EXPR_BINARY_LESSEQUAL:
2609         case EXPR_BINARY_GREATER:
2610         case EXPR_BINARY_GREATEREQUAL:
2611         case EXPR_BINARY_ISGREATER:
2612         case EXPR_BINARY_ISGREATEREQUAL:
2613         case EXPR_BINARY_ISLESS:
2614         case EXPR_BINARY_ISLESSEQUAL:
2615         case EXPR_BINARY_ISLESSGREATER:
2616         case EXPR_BINARY_ISUNORDERED: {
2617                 dbg_info   *dbgi     = get_dbg_info(&expression->base.source_position);
2618                 ir_node    *left     = expression_to_firm(expression->left);
2619                 ir_node    *right    = expression_to_firm(expression->right);
2620                 ir_relation relation = get_relation(kind);
2621                 ir_node    *cmp      = new_d_Cmp(dbgi, left, right, relation);
2622                 return cmp;
2623         }
2624         case EXPR_BINARY_ASSIGN: {
2625                 ir_node *addr  = expression_to_addr(expression->left);
2626                 ir_node *right = expression_to_firm(expression->right);
2627                 ir_node *res
2628                         = set_value_for_expression_addr(expression->left, right, addr);
2629
2630                 type_t  *type            = skip_typeref(expression->base.type);
2631                 if (!is_type_compound(type)) {
2632                         ir_mode *mode_arithmetic = get_ir_mode_arithmetic(type);
2633                         res                      = create_conv(NULL, res, mode_arithmetic);
2634                 }
2635                 return res;
2636         }
2637         case EXPR_BINARY_ADD:
2638         case EXPR_BINARY_SUB:
2639         case EXPR_BINARY_MUL:
2640         case EXPR_BINARY_DIV:
2641         case EXPR_BINARY_MOD:
2642         case EXPR_BINARY_BITWISE_AND:
2643         case EXPR_BINARY_BITWISE_OR:
2644         case EXPR_BINARY_BITWISE_XOR:
2645         case EXPR_BINARY_SHIFTLEFT:
2646         case EXPR_BINARY_SHIFTRIGHT:
2647         {
2648                 dbg_info *dbgi  = get_dbg_info(&expression->base.source_position);
2649                 ir_node  *left  = expression_to_firm(expression->left);
2650                 ir_node  *right = expression_to_firm(expression->right);
2651                 return create_op(dbgi, expression, left, right);
2652         }
2653         case EXPR_BINARY_LOGICAL_AND:
2654         case EXPR_BINARY_LOGICAL_OR:
2655                 return create_lazy_op(expression);
2656         case EXPR_BINARY_COMMA:
2657                 /* create side effects of left side */
2658                 (void) expression_to_firm(expression->left);
2659                 return _expression_to_firm(expression->right);
2660
2661         case EXPR_BINARY_ADD_ASSIGN:
2662         case EXPR_BINARY_SUB_ASSIGN:
2663         case EXPR_BINARY_MUL_ASSIGN:
2664         case EXPR_BINARY_MOD_ASSIGN:
2665         case EXPR_BINARY_DIV_ASSIGN:
2666         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2667         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2668         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2669         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2670         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2671                 return create_assign_binop(expression);
2672         default:
2673                 panic("TODO binexpr type");
2674         }
2675 }
2676
2677 static ir_node *array_access_addr(const array_access_expression_t *expression)
2678 {
2679         dbg_info *dbgi        = get_dbg_info(&expression->base.source_position);
2680         ir_node  *base_addr   = expression_to_firm(expression->array_ref);
2681         ir_node  *offset      = expression_to_firm(expression->index);
2682         type_t   *ref_type    = skip_typeref(expression->array_ref->base.type);
2683         ir_node  *real_offset = adjust_for_pointer_arithmetic(dbgi, offset, ref_type);
2684         ir_node  *result      = new_d_Add(dbgi, base_addr, real_offset, mode_P_data);
2685
2686         return result;
2687 }
2688
2689 static ir_node *array_access_to_firm(
2690                 const array_access_expression_t *expression)
2691 {
2692         dbg_info *dbgi   = get_dbg_info(&expression->base.source_position);
2693         ir_node  *addr   = array_access_addr(expression);
2694         type_t   *type   = revert_automatic_type_conversion(
2695                         (const expression_t*) expression);
2696         type             = skip_typeref(type);
2697
2698         return deref_address(dbgi, type, addr);
2699 }
2700
2701 static long get_offsetof_offset(const offsetof_expression_t *expression)
2702 {
2703         type_t *orig_type = expression->type;
2704         long    offset    = 0;
2705
2706         designator_t *designator = expression->designator;
2707         for ( ; designator != NULL; designator = designator->next) {
2708                 type_t *type = skip_typeref(orig_type);
2709                 /* be sure the type is constructed */
2710                 (void) get_ir_type(type);
2711
2712                 if (designator->symbol != NULL) {
2713                         assert(is_type_compound(type));
2714                         symbol_t *symbol = designator->symbol;
2715
2716                         compound_t *compound = type->compound.compound;
2717                         entity_t   *iter     = compound->members.entities;
2718                         for ( ; iter != NULL; iter = iter->base.next) {
2719                                 if (iter->base.symbol == symbol) {
2720                                         break;
2721                                 }
2722                         }
2723                         assert(iter != NULL);
2724
2725                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
2726                         assert(iter->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
2727                         offset += get_entity_offset(iter->compound_member.entity);
2728
2729                         orig_type = iter->declaration.type;
2730                 } else {
2731                         expression_t *array_index = designator->array_index;
2732                         assert(designator->array_index != NULL);
2733                         assert(is_type_array(type));
2734
2735                         long index         = fold_constant_to_int(array_index);
2736                         ir_type *arr_type  = get_ir_type(type);
2737                         ir_type *elem_type = get_array_element_type(arr_type);
2738                         long     elem_size = get_type_size_bytes(elem_type);
2739
2740                         offset += index * elem_size;
2741
2742                         orig_type = type->array.element_type;
2743                 }
2744         }
2745
2746         return offset;
2747 }
2748
2749 static ir_node *offsetof_to_firm(const offsetof_expression_t *expression)
2750 {
2751         ir_mode   *mode   = get_ir_mode_arithmetic(expression->base.type);
2752         long       offset = get_offsetof_offset(expression);
2753         ir_tarval *tv     = new_tarval_from_long(offset, mode);
2754         dbg_info  *dbgi   = get_dbg_info(&expression->base.source_position);
2755
2756         return new_d_Const(dbgi, tv);
2757 }
2758
2759 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
2760                                      ir_entity *entity, type_t *type);
2761 static ir_initializer_t *create_ir_initializer(
2762                 const initializer_t *initializer, type_t *type);
2763
2764 static ir_entity *create_initializer_entity(dbg_info *dbgi,
2765                                             initializer_t *initializer,
2766                                             type_t *type)
2767 {
2768         /* create the ir_initializer */
2769         ir_graph *const old_current_ir_graph = current_ir_graph;
2770         current_ir_graph = get_const_code_irg();
2771
2772         ir_initializer_t *irinitializer = create_ir_initializer(initializer, type);
2773
2774         assert(current_ir_graph == get_const_code_irg());
2775         current_ir_graph = old_current_ir_graph;
2776
2777         ident     *const id          = id_unique("initializer.%u");
2778         ir_type   *const irtype      = get_ir_type(type);
2779         ir_type   *const global_type = get_glob_type();
2780         ir_entity *const entity      = new_d_entity(global_type, id, irtype, dbgi);
2781         set_entity_ld_ident(entity, id);
2782         set_entity_visibility(entity, ir_visibility_private);
2783         add_entity_linkage(entity, IR_LINKAGE_CONSTANT);
2784         set_entity_initializer(entity, irinitializer);
2785         return entity;
2786 }
2787
2788 static ir_node *compound_literal_addr(compound_literal_expression_t const *const expression)
2789 {
2790         dbg_info      *dbgi        = get_dbg_info(&expression->base.source_position);
2791         type_t        *type        = expression->type;
2792         initializer_t *initializer = expression->initializer;
2793
2794         if (is_constant_initializer(initializer) == EXPR_CLASS_CONSTANT) {
2795                 ir_entity *entity = create_initializer_entity(dbgi, initializer, type);
2796                 return create_symconst(dbgi, entity);
2797         } else {
2798                 /* create an entity on the stack */
2799                 ident   *const id     = id_unique("CompLit.%u");
2800                 ir_type *const irtype = get_ir_type(type);
2801                 ir_type *frame_type   = get_irg_frame_type(current_ir_graph);
2802
2803                 ir_entity *const entity = new_d_entity(frame_type, id, irtype, dbgi);
2804                 set_entity_ld_ident(entity, id);
2805
2806                 /* create initialisation code */
2807                 create_local_initializer(initializer, dbgi, entity, type);
2808
2809                 /* create a sel for the compound literal address */
2810                 ir_node *frame = get_irg_frame(current_ir_graph);
2811                 ir_node *sel   = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
2812                 return sel;
2813         }
2814 }
2815
2816 static ir_node *compound_literal_to_firm(compound_literal_expression_t const* const expr)
2817 {
2818         dbg_info *const dbgi = get_dbg_info(&expr->base.source_position);
2819         type_t   *const type = expr->type;
2820         ir_node  *const addr = compound_literal_addr(expr);
2821         return deref_address(dbgi, type, addr);
2822 }
2823
2824 /**
2825  * Transform a sizeof expression into Firm code.
2826  */
2827 static ir_node *sizeof_to_firm(const typeprop_expression_t *expression)
2828 {
2829         type_t *const type = skip_typeref(expression->type);
2830         /* §6.5.3.4:2 if the type is a VLA, evaluate the expression. */
2831         if (is_type_array(type) && type->array.is_vla
2832                         && expression->tp_expression != NULL) {
2833                 expression_to_firm(expression->tp_expression);
2834         }
2835
2836         return get_type_size_node(type);
2837 }
2838
2839 static entity_t *get_expression_entity(const expression_t *expression)
2840 {
2841         if (expression->kind != EXPR_REFERENCE)
2842                 return NULL;
2843
2844         return expression->reference.entity;
2845 }
2846
2847 static unsigned get_cparser_entity_alignment(const entity_t *entity)
2848 {
2849         switch(entity->kind) {
2850         case DECLARATION_KIND_CASES:
2851                 return entity->declaration.alignment;
2852         case ENTITY_STRUCT:
2853         case ENTITY_UNION:
2854                 return entity->compound.alignment;
2855         case ENTITY_TYPEDEF:
2856                 return entity->typedefe.alignment;
2857         default:
2858                 break;
2859         }
2860         return 0;
2861 }
2862
2863 /**
2864  * Transform an alignof expression into Firm code.
2865  */
2866 static ir_node *alignof_to_firm(const typeprop_expression_t *expression)
2867 {
2868         unsigned alignment = 0;
2869
2870         const expression_t *tp_expression = expression->tp_expression;
2871         if (tp_expression != NULL) {
2872                 entity_t *entity = get_expression_entity(tp_expression);
2873                 if (entity != NULL) {
2874                         alignment = get_cparser_entity_alignment(entity);
2875                 }
2876         }
2877
2878         if (alignment == 0) {
2879                 type_t *type = expression->type;
2880                 alignment = get_type_alignment(type);
2881         }
2882
2883         dbg_info  *dbgi = get_dbg_info(&expression->base.source_position);
2884         ir_mode   *mode = get_ir_mode_arithmetic(expression->base.type);
2885         ir_tarval *tv   = new_tarval_from_long(alignment, mode);
2886         return new_d_Const(dbgi, tv);
2887 }
2888
2889 static void init_ir_types(void);
2890
2891 static ir_tarval *fold_constant_to_tarval(const expression_t *expression)
2892 {
2893         assert(is_constant_expression(expression) == EXPR_CLASS_CONSTANT);
2894
2895         bool constant_folding_old = constant_folding;
2896         constant_folding = true;
2897         int old_optimize         = get_optimize();
2898         int old_constant_folding = get_opt_constant_folding();
2899         set_optimize(1);
2900         set_opt_constant_folding(1);
2901
2902         init_ir_types();
2903
2904         ir_graph *old_current_ir_graph = current_ir_graph;
2905         current_ir_graph = get_const_code_irg();
2906
2907         ir_node *const cnst = _expression_to_firm(expression);
2908
2909         current_ir_graph = old_current_ir_graph;
2910         set_optimize(old_optimize);
2911         set_opt_constant_folding(old_constant_folding);
2912
2913         if (!is_Const(cnst)) {
2914                 panic("couldn't fold constant");
2915         }
2916
2917         constant_folding = constant_folding_old;
2918
2919         ir_tarval *const tv   = get_Const_tarval(cnst);
2920         ir_mode   *const mode = get_ir_mode_arithmetic(skip_typeref(expression->base.type));
2921         return tarval_convert_to(tv, mode);
2922 }
2923
2924 /* this function is only used in parser.c, but it relies on libfirm functionality */
2925 bool constant_is_negative(const expression_t *expression)
2926 {
2927         ir_tarval *tv = fold_constant_to_tarval(expression);
2928         return tarval_is_negative(tv);
2929 }
2930
2931 long fold_constant_to_int(const expression_t *expression)
2932 {
2933         ir_tarval *tv = fold_constant_to_tarval(expression);
2934         if (!tarval_is_long(tv)) {
2935                 panic("result of constant folding is not integer");
2936         }
2937
2938         return get_tarval_long(tv);
2939 }
2940
2941 bool fold_constant_to_bool(const expression_t *expression)
2942 {
2943         ir_tarval *tv = fold_constant_to_tarval(expression);
2944         return !tarval_is_null(tv);
2945 }
2946
2947 static ir_node *conditional_to_firm(const conditional_expression_t *expression)
2948 {
2949         dbg_info *const dbgi = get_dbg_info(&expression->base.source_position);
2950
2951         /* first try to fold a constant condition */
2952         if (is_constant_expression(expression->condition) == EXPR_CLASS_CONSTANT) {
2953                 bool val = fold_constant_to_bool(expression->condition);
2954                 if (val) {
2955                         expression_t *true_expression = expression->true_expression;
2956                         if (true_expression == NULL)
2957                                 true_expression = expression->condition;
2958                         return expression_to_firm(true_expression);
2959                 } else {
2960                         return expression_to_firm(expression->false_expression);
2961                 }
2962         }
2963
2964         ir_node *const true_block  = new_immBlock();
2965         ir_node *const false_block = new_immBlock();
2966         ir_node *const cond_expr   = create_condition_evaluation(expression->condition, true_block, false_block);
2967         mature_immBlock(true_block);
2968         mature_immBlock(false_block);
2969
2970         set_cur_block(true_block);
2971         ir_node *true_val;
2972         if (expression->true_expression != NULL) {
2973                 true_val = expression_to_firm(expression->true_expression);
2974         } else if (cond_expr != NULL && get_irn_mode(cond_expr) != mode_b) {
2975                 true_val = cond_expr;
2976         } else {
2977                 /* Condition ended with a short circuit (&&, ||, !) operation or a
2978                  * comparison.  Generate a "1" as value for the true branch. */
2979                 true_val = new_Const(get_mode_one(mode_Is));
2980         }
2981         ir_node *const true_jmp = new_d_Jmp(dbgi);
2982
2983         set_cur_block(false_block);
2984         ir_node *const false_val = expression_to_firm(expression->false_expression);
2985         ir_node *const false_jmp = new_d_Jmp(dbgi);
2986
2987         /* create the common block */
2988         ir_node *const in_cf[2] = { true_jmp, false_jmp };
2989         ir_node *const block    = new_Block(lengthof(in_cf), in_cf);
2990         set_cur_block(block);
2991
2992         /* TODO improve static semantics, so either both or no values are NULL */
2993         if (true_val == NULL || false_val == NULL)
2994                 return NULL;
2995
2996         ir_node *const in[2] = { true_val, false_val };
2997         type_t  *const type  = skip_typeref(expression->base.type);
2998         ir_mode *const mode  = get_ir_mode_arithmetic(type);
2999         ir_node *const val   = new_d_Phi(dbgi, lengthof(in), in, mode);
3000
3001         return val;
3002 }
3003
3004 /**
3005  * Returns an IR-node representing the address of a field.
3006  */
3007 static ir_node *select_addr(const select_expression_t *expression)
3008 {
3009         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3010
3011         construct_select_compound(expression);
3012
3013         ir_node *compound_addr = expression_to_firm(expression->compound);
3014
3015         entity_t *entry = expression->compound_entry;
3016         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3017         assert(entry->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
3018
3019         if (constant_folding) {
3020                 ir_mode *mode      = get_irn_mode(compound_addr);
3021                 ir_mode *mode_uint = get_reference_mode_unsigned_eq(mode);
3022                 ir_node *ofs       = new_Const_long(mode_uint, entry->compound_member.offset);
3023                 return new_d_Add(dbgi, compound_addr, ofs, mode);
3024         } else {
3025                 ir_entity *irentity = entry->compound_member.entity;
3026                 assert(irentity != NULL);
3027                 return new_d_simpleSel(dbgi, new_NoMem(), compound_addr, irentity);
3028         }
3029 }
3030
3031 static ir_node *select_to_firm(const select_expression_t *expression)
3032 {
3033         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3034         ir_node  *addr = select_addr(expression);
3035         type_t   *type = revert_automatic_type_conversion(
3036                         (const expression_t*) expression);
3037         type           = skip_typeref(type);
3038
3039         entity_t *entry = expression->compound_entry;
3040         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3041
3042         if (entry->compound_member.bitfield) {
3043                 return bitfield_extract_to_firm(expression, addr);
3044         }
3045
3046         return deref_address(dbgi, type, addr);
3047 }
3048
3049 /* Values returned by __builtin_classify_type. */
3050 typedef enum gcc_type_class
3051 {
3052         no_type_class = -1,
3053         void_type_class,
3054         integer_type_class,
3055         char_type_class,
3056         enumeral_type_class,
3057         boolean_type_class,
3058         pointer_type_class,
3059         reference_type_class,
3060         offset_type_class,
3061         real_type_class,
3062         complex_type_class,
3063         function_type_class,
3064         method_type_class,
3065         record_type_class,
3066         union_type_class,
3067         array_type_class,
3068         string_type_class,
3069         set_type_class,
3070         file_type_class,
3071         lang_type_class
3072 } gcc_type_class;
3073
3074 static ir_node *classify_type_to_firm(const classify_type_expression_t *const expr)
3075 {
3076         type_t *type = expr->type_expression->base.type;
3077
3078         /* FIXME gcc returns different values depending on whether compiling C or C++
3079          * e.g. int x[10] is pointer_type_class in C, but array_type_class in C++ */
3080         gcc_type_class tc;
3081         for (;;) {
3082                 type = skip_typeref(type);
3083                 switch (type->kind) {
3084                         case TYPE_ATOMIC: {
3085                                 const atomic_type_t *const atomic_type = &type->atomic;
3086                                 switch (atomic_type->akind) {
3087                                         /* should not be reached */
3088                                         case ATOMIC_TYPE_INVALID:
3089                                                 tc = no_type_class;
3090                                                 goto make_const;
3091
3092                                         /* gcc cannot do that */
3093                                         case ATOMIC_TYPE_VOID:
3094                                                 tc = void_type_class;
3095                                                 goto make_const;
3096
3097                                         case ATOMIC_TYPE_WCHAR_T:   /* gcc handles this as integer */
3098                                         case ATOMIC_TYPE_CHAR:      /* gcc handles this as integer */
3099                                         case ATOMIC_TYPE_SCHAR:     /* gcc handles this as integer */
3100                                         case ATOMIC_TYPE_UCHAR:     /* gcc handles this as integer */
3101                                         case ATOMIC_TYPE_SHORT:
3102                                         case ATOMIC_TYPE_USHORT:
3103                                         case ATOMIC_TYPE_INT:
3104                                         case ATOMIC_TYPE_UINT:
3105                                         case ATOMIC_TYPE_LONG:
3106                                         case ATOMIC_TYPE_ULONG:
3107                                         case ATOMIC_TYPE_LONGLONG:
3108                                         case ATOMIC_TYPE_ULONGLONG:
3109                                         case ATOMIC_TYPE_BOOL:      /* gcc handles this as integer */
3110                                                 tc = integer_type_class;
3111                                                 goto make_const;
3112
3113                                         case ATOMIC_TYPE_FLOAT:
3114                                         case ATOMIC_TYPE_DOUBLE:
3115                                         case ATOMIC_TYPE_LONG_DOUBLE:
3116                                                 tc = real_type_class;
3117                                                 goto make_const;
3118                                 }
3119                                 panic("Unexpected atomic type in classify_type_to_firm().");
3120                         }
3121
3122                         case TYPE_COMPLEX:         tc = complex_type_class; goto make_const;
3123                         case TYPE_IMAGINARY:       tc = complex_type_class; goto make_const;
3124                         case TYPE_ARRAY:           /* gcc handles this as pointer */
3125                         case TYPE_FUNCTION:        /* gcc handles this as pointer */
3126                         case TYPE_POINTER:         tc = pointer_type_class; goto make_const;
3127                         case TYPE_COMPOUND_STRUCT: tc = record_type_class;  goto make_const;
3128                         case TYPE_COMPOUND_UNION:  tc = union_type_class;   goto make_const;
3129
3130                         /* gcc handles this as integer */
3131                         case TYPE_ENUM:            tc = integer_type_class; goto make_const;
3132
3133                         /* gcc classifies the referenced type */
3134                         case TYPE_REFERENCE: type = type->reference.refers_to; continue;
3135
3136                         /* typedef/typeof should be skipped already */
3137                         case TYPE_TYPEDEF:
3138                         case TYPE_TYPEOF:
3139                         case TYPE_ERROR:
3140                                 break;
3141                 }
3142                 panic("unexpected TYPE classify_type_to_firm().");
3143         }
3144
3145 make_const:;
3146         dbg_info  *const dbgi = get_dbg_info(&expr->base.source_position);
3147         ir_mode   *const mode = atomic_modes[ATOMIC_TYPE_INT];
3148         ir_tarval *const tv   = new_tarval_from_long(tc, mode);
3149         return new_d_Const(dbgi, tv);
3150 }
3151
3152 static ir_node *function_name_to_firm(
3153                 const funcname_expression_t *const expr)
3154 {
3155         switch(expr->kind) {
3156         case FUNCNAME_FUNCTION:
3157         case FUNCNAME_PRETTY_FUNCTION:
3158         case FUNCNAME_FUNCDNAME:
3159                 if (current_function_name == NULL) {
3160                         const source_position_t *const src_pos = &expr->base.source_position;
3161                         const char    *name  = current_function_entity->base.symbol->string;
3162                         const string_t string = { name, strlen(name) };
3163                         current_function_name = string_to_firm(src_pos, "__func__.%u", STRING_ENCODING_CHAR, &string);
3164                 }
3165                 return current_function_name;
3166         case FUNCNAME_FUNCSIG:
3167                 if (current_funcsig == NULL) {
3168                         const source_position_t *const src_pos = &expr->base.source_position;
3169                         ir_entity *ent = get_irg_entity(current_ir_graph);
3170                         const char *const name = get_entity_ld_name(ent);
3171                         const string_t string = { name, strlen(name) };
3172                         current_funcsig = string_to_firm(src_pos, "__FUNCSIG__.%u", STRING_ENCODING_CHAR, &string);
3173                 }
3174                 return current_funcsig;
3175         }
3176         panic("Unsupported function name");
3177 }
3178
3179 static ir_node *statement_expression_to_firm(const statement_expression_t *expr)
3180 {
3181         statement_t *statement = expr->statement;
3182
3183         assert(statement->kind == STATEMENT_COMPOUND);
3184         return compound_statement_to_firm(&statement->compound);
3185 }
3186
3187 static ir_node *va_start_expression_to_firm(
3188         const va_start_expression_t *const expr)
3189 {
3190         ir_entity *param_ent = current_vararg_entity;
3191         if (param_ent == NULL) {
3192                 size_t   const n           = IR_VA_START_PARAMETER_NUMBER;
3193                 ir_type *const frame_type  = get_irg_frame_type(current_ir_graph);
3194                 ir_type *const param_type  = get_unknown_type();
3195                 param_ent = new_parameter_entity(frame_type, n, param_type);
3196                 current_vararg_entity = param_ent;
3197         }
3198
3199         ir_node  *const frame   = get_irg_frame(current_ir_graph);
3200         dbg_info *const dbgi    = get_dbg_info(&expr->base.source_position);
3201         ir_node  *const no_mem  = new_NoMem();
3202         ir_node  *const arg_sel = new_d_simpleSel(dbgi, no_mem, frame, param_ent);
3203
3204         set_value_for_expression(expr->ap, arg_sel);
3205
3206         return NULL;
3207 }
3208
3209 static ir_node *va_arg_expression_to_firm(const va_arg_expression_t *const expr)
3210 {
3211         type_t       *const type    = expr->base.type;
3212         expression_t *const ap_expr = expr->ap;
3213         ir_node      *const ap_addr = expression_to_addr(ap_expr);
3214         ir_node      *const ap      = get_value_from_lvalue(ap_expr, ap_addr);
3215         dbg_info     *const dbgi    = get_dbg_info(&expr->base.source_position);
3216         ir_node      *const res     = deref_address(dbgi, type, ap);
3217
3218         ir_node      *const cnst    = get_type_size_node(expr->base.type);
3219         ir_mode      *const mode    = get_irn_mode(cnst);
3220         ir_node      *const c1      = new_Const_long(mode, stack_param_align - 1);
3221         ir_node      *const c2      = new_d_Add(dbgi, cnst, c1, mode);
3222         ir_node      *const c3      = new_Const_long(mode, -(long)stack_param_align);
3223         ir_node      *const c4      = new_d_And(dbgi, c2, c3, mode);
3224         ir_node      *const add     = new_d_Add(dbgi, ap, c4, mode_P_data);
3225
3226         set_value_for_expression_addr(ap_expr, add, ap_addr);
3227
3228         return res;
3229 }
3230
3231 /**
3232  * Generate Firm for a va_copy expression.
3233  */
3234 static ir_node *va_copy_expression_to_firm(const va_copy_expression_t *const expr)
3235 {
3236         ir_node *const src = expression_to_firm(expr->src);
3237         set_value_for_expression(expr->dst, src);
3238         return NULL;
3239 }
3240
3241 static ir_node *dereference_addr(const unary_expression_t *const expression)
3242 {
3243         assert(expression->base.kind == EXPR_UNARY_DEREFERENCE);
3244         return expression_to_firm(expression->value);
3245 }
3246
3247 /**
3248  * Returns a IR-node representing an lvalue of the given expression.
3249  */
3250 static ir_node *expression_to_addr(const expression_t *expression)
3251 {
3252         switch(expression->kind) {
3253         case EXPR_ARRAY_ACCESS:
3254                 return array_access_addr(&expression->array_access);
3255         case EXPR_CALL:
3256                 return call_expression_to_firm(&expression->call);
3257         case EXPR_COMPOUND_LITERAL:
3258                 return compound_literal_addr(&expression->compound_literal);
3259         case EXPR_REFERENCE:
3260                 return reference_addr(&expression->reference);
3261         case EXPR_SELECT:
3262                 return select_addr(&expression->select);
3263         case EXPR_UNARY_DEREFERENCE:
3264                 return dereference_addr(&expression->unary);
3265         default:
3266                 break;
3267         }
3268         panic("trying to get address of non-lvalue");
3269 }
3270
3271 static ir_node *builtin_constant_to_firm(
3272                 const builtin_constant_expression_t *expression)
3273 {
3274         ir_mode *const mode = get_ir_mode_arithmetic(expression->base.type);
3275         bool     const v    = is_constant_expression(expression->value) == EXPR_CLASS_CONSTANT;
3276         return create_Const_from_bool(mode, v);
3277 }
3278
3279 static ir_node *builtin_types_compatible_to_firm(
3280                 const builtin_types_compatible_expression_t *expression)
3281 {
3282         type_t  *const left  = get_unqualified_type(skip_typeref(expression->left));
3283         type_t  *const right = get_unqualified_type(skip_typeref(expression->right));
3284         bool     const value = types_compatible(left, right);
3285         ir_mode *const mode  = get_ir_mode_arithmetic(expression->base.type);
3286         return create_Const_from_bool(mode, value);
3287 }
3288
3289 static ir_node *get_label_block(label_t *label)
3290 {
3291         if (label->block != NULL)
3292                 return label->block;
3293
3294         /* beware: might be called from create initializer with current_ir_graph
3295          * set to const_code_irg. */
3296         ir_graph *rem    = current_ir_graph;
3297         current_ir_graph = current_function;
3298
3299         ir_node *block = new_immBlock();
3300
3301         label->block = block;
3302
3303         ARR_APP1(label_t *, all_labels, label);
3304
3305         current_ir_graph = rem;
3306         return block;
3307 }
3308
3309 /**
3310  * Pointer to a label.  This is used for the
3311  * GNU address-of-label extension.
3312  */
3313 static ir_node *label_address_to_firm(const label_address_expression_t *label)
3314 {
3315         dbg_info  *dbgi   = get_dbg_info(&label->base.source_position);
3316         ir_node   *block  = get_label_block(label->label);
3317         ir_entity *entity = create_Block_entity(block);
3318
3319         symconst_symbol value;
3320         value.entity_p = entity;
3321         return new_d_SymConst(dbgi, mode_P_code, value, symconst_addr_ent);
3322 }
3323
3324 /**
3325  * creates firm nodes for an expression. The difference between this function
3326  * and expression_to_firm is, that this version might produce mode_b nodes
3327  * instead of mode_Is.
3328  */
3329 static ir_node *_expression_to_firm(expression_t const *const expr)
3330 {
3331 #ifndef NDEBUG
3332         if (!constant_folding) {
3333                 assert(!expr->base.transformed);
3334                 ((expression_t*)expr)->base.transformed = true;
3335         }
3336 #endif
3337
3338         switch (expr->kind) {
3339         case EXPR_ALIGNOF:                    return alignof_to_firm(                 &expr->typeprop);
3340         case EXPR_ARRAY_ACCESS:               return array_access_to_firm(            &expr->array_access);
3341         case EXPR_BINARY_CASES:               return binary_expression_to_firm(       &expr->binary);
3342         case EXPR_BUILTIN_CONSTANT_P:         return builtin_constant_to_firm(        &expr->builtin_constant);
3343         case EXPR_BUILTIN_TYPES_COMPATIBLE_P: return builtin_types_compatible_to_firm(&expr->builtin_types_compatible);
3344         case EXPR_CALL:                       return call_expression_to_firm(         &expr->call);
3345         case EXPR_CLASSIFY_TYPE:              return classify_type_to_firm(           &expr->classify_type);
3346         case EXPR_COMPOUND_LITERAL:           return compound_literal_to_firm(        &expr->compound_literal);
3347         case EXPR_CONDITIONAL:                return conditional_to_firm(             &expr->conditional);
3348         case EXPR_FUNCNAME:                   return function_name_to_firm(           &expr->funcname);
3349         case EXPR_LABEL_ADDRESS:              return label_address_to_firm(           &expr->label_address);
3350         case EXPR_LITERAL_CASES:              return literal_to_firm(                 &expr->literal);
3351         case EXPR_LITERAL_CHARACTER:
3352         case EXPR_LITERAL_WIDE_CHARACTER:     return char_literal_to_firm(            &expr->string_literal);
3353         case EXPR_OFFSETOF:                   return offsetof_to_firm(                &expr->offsetofe);
3354         case EXPR_REFERENCE:                  return reference_expression_to_firm(    &expr->reference);
3355         case EXPR_ENUM_CONSTANT:              return enum_constant_to_firm(           &expr->reference);
3356         case EXPR_SELECT:                     return select_to_firm(                  &expr->select);
3357         case EXPR_SIZEOF:                     return sizeof_to_firm(                  &expr->typeprop);
3358         case EXPR_STATEMENT:                  return statement_expression_to_firm(    &expr->statement);
3359         case EXPR_UNARY_CASES:                return unary_expression_to_firm(        &expr->unary);
3360         case EXPR_VA_ARG:                     return va_arg_expression_to_firm(       &expr->va_arge);
3361         case EXPR_VA_COPY:                    return va_copy_expression_to_firm(      &expr->va_copye);
3362         case EXPR_VA_START:                   return va_start_expression_to_firm(     &expr->va_starte);
3363
3364         case EXPR_STRING_LITERAL: return string_to_firm(&expr->base.source_position, "str.%u", expr->string_literal.encoding, &expr->string_literal.value);
3365
3366         case EXPR_ERROR: break;
3367         }
3368         panic("invalid expression found");
3369 }
3370
3371 /**
3372  * Check if a given expression is a GNU __builtin_expect() call.
3373  */
3374 static bool is_builtin_expect(const expression_t *expression)
3375 {
3376         if (expression->kind != EXPR_CALL)
3377                 return false;
3378
3379         expression_t *function = expression->call.function;
3380         if (function->kind != EXPR_REFERENCE)
3381                 return false;
3382         reference_expression_t *ref = &function->reference;
3383         if (ref->entity->kind         != ENTITY_FUNCTION ||
3384             ref->entity->function.btk != BUILTIN_EXPECT)
3385                 return false;
3386
3387         return true;
3388 }
3389
3390 static bool produces_mode_b(const expression_t *expression)
3391 {
3392         switch (expression->kind) {
3393         case EXPR_BINARY_EQUAL:
3394         case EXPR_BINARY_NOTEQUAL:
3395         case EXPR_BINARY_LESS:
3396         case EXPR_BINARY_LESSEQUAL:
3397         case EXPR_BINARY_GREATER:
3398         case EXPR_BINARY_GREATEREQUAL:
3399         case EXPR_BINARY_ISGREATER:
3400         case EXPR_BINARY_ISGREATEREQUAL:
3401         case EXPR_BINARY_ISLESS:
3402         case EXPR_BINARY_ISLESSEQUAL:
3403         case EXPR_BINARY_ISLESSGREATER:
3404         case EXPR_BINARY_ISUNORDERED:
3405         case EXPR_UNARY_NOT:
3406                 return true;
3407
3408         case EXPR_CALL:
3409                 if (is_builtin_expect(expression)) {
3410                         expression_t *argument = expression->call.arguments->expression;
3411                         return produces_mode_b(argument);
3412                 }
3413                 return false;
3414         case EXPR_BINARY_COMMA:
3415                 return produces_mode_b(expression->binary.right);
3416
3417         default:
3418                 return false;
3419         }
3420 }
3421
3422 static ir_node *expression_to_firm(const expression_t *expression)
3423 {
3424         if (!produces_mode_b(expression)) {
3425                 ir_node *res = _expression_to_firm(expression);
3426                 assert(res == NULL || get_irn_mode(res) != mode_b);
3427                 return res;
3428         }
3429
3430         if (is_constant_expression(expression) == EXPR_CLASS_CONSTANT) {
3431                 return new_Const(fold_constant_to_tarval(expression));
3432         }
3433
3434         /* we have to produce a 0/1 from the mode_b expression */
3435         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3436         ir_mode  *mode = get_ir_mode_arithmetic(expression->base.type);
3437         return produce_condition_result(expression, mode, dbgi);
3438 }
3439
3440 /**
3441  * create a short-circuit expression evaluation that tries to construct
3442  * efficient control flow structures for &&, || and ! expressions
3443  */
3444 static ir_node *create_condition_evaluation(const expression_t *expression,
3445                                             ir_node *true_block,
3446                                             ir_node *false_block)
3447 {
3448         switch(expression->kind) {
3449         case EXPR_UNARY_NOT: {
3450                 const unary_expression_t *unary_expression = &expression->unary;
3451                 create_condition_evaluation(unary_expression->value, false_block,
3452                                             true_block);
3453                 return NULL;
3454         }
3455         case EXPR_BINARY_LOGICAL_AND: {
3456                 const binary_expression_t *binary_expression = &expression->binary;
3457
3458                 ir_node *extra_block = new_immBlock();
3459                 create_condition_evaluation(binary_expression->left, extra_block,
3460                                             false_block);
3461                 mature_immBlock(extra_block);
3462                 set_cur_block(extra_block);
3463                 create_condition_evaluation(binary_expression->right, true_block,
3464                                             false_block);
3465                 return NULL;
3466         }
3467         case EXPR_BINARY_LOGICAL_OR: {
3468                 const binary_expression_t *binary_expression = &expression->binary;
3469
3470                 ir_node *extra_block = new_immBlock();
3471                 create_condition_evaluation(binary_expression->left, true_block,
3472                                             extra_block);
3473                 mature_immBlock(extra_block);
3474                 set_cur_block(extra_block);
3475                 create_condition_evaluation(binary_expression->right, true_block,
3476                                             false_block);
3477                 return NULL;
3478         }
3479         default:
3480                 break;
3481         }
3482
3483         dbg_info *dbgi       = get_dbg_info(&expression->base.source_position);
3484         ir_node  *cond_expr  = _expression_to_firm(expression);
3485         ir_node  *condition  = create_conv(dbgi, cond_expr, mode_b);
3486         ir_node  *cond       = new_d_Cond(dbgi, condition);
3487         ir_node  *true_proj  = new_d_Proj(dbgi, cond, mode_X, pn_Cond_true);
3488         ir_node  *false_proj = new_d_Proj(dbgi, cond, mode_X, pn_Cond_false);
3489
3490         /* set branch prediction info based on __builtin_expect */
3491         if (is_builtin_expect(expression) && is_Cond(cond)) {
3492                 call_argument_t *argument = expression->call.arguments->next;
3493                 if (is_constant_expression(argument->expression) == EXPR_CLASS_CONSTANT) {
3494                         bool               const cnst = fold_constant_to_bool(argument->expression);
3495                         cond_jmp_predicate const pred = cnst ? COND_JMP_PRED_TRUE : COND_JMP_PRED_FALSE;
3496                         set_Cond_jmp_pred(cond, pred);
3497                 }
3498         }
3499
3500         add_immBlock_pred(true_block, true_proj);
3501         add_immBlock_pred(false_block, false_proj);
3502
3503         set_unreachable_now();
3504         return cond_expr;
3505 }
3506
3507 static void create_variable_entity(entity_t *variable,
3508                                    declaration_kind_t declaration_kind,
3509                                    ir_type *parent_type)
3510 {
3511         assert(variable->kind == ENTITY_VARIABLE);
3512         type_t    *type = skip_typeref(variable->declaration.type);
3513
3514         ident     *const id        = new_id_from_str(variable->base.symbol->string);
3515         ir_type   *const irtype    = get_ir_type(type);
3516         dbg_info  *const dbgi      = get_dbg_info(&variable->base.source_position);
3517         ir_entity *const irentity  = new_d_entity(parent_type, id, irtype, dbgi);
3518         unsigned         alignment = variable->declaration.alignment;
3519
3520         set_entity_alignment(irentity, alignment);
3521
3522         handle_decl_modifiers(irentity, variable);
3523
3524         variable->declaration.kind  = (unsigned char) declaration_kind;
3525         variable->variable.v.entity = irentity;
3526         set_entity_ld_ident(irentity, create_ld_ident(variable));
3527
3528         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
3529                 set_entity_volatility(irentity, volatility_is_volatile);
3530         }
3531 }
3532
3533
3534 typedef struct type_path_entry_t type_path_entry_t;
3535 struct type_path_entry_t {
3536         type_t           *type;
3537         ir_initializer_t *initializer;
3538         size_t            index;
3539         entity_t         *compound_entry;
3540 };
3541
3542 typedef struct type_path_t type_path_t;
3543 struct type_path_t {
3544         type_path_entry_t *path;
3545         type_t            *top_type;
3546         bool               invalid;
3547 };
3548
3549 static __attribute__((unused)) void debug_print_type_path(const type_path_t *path)
3550 {
3551         size_t len = ARR_LEN(path->path);
3552
3553         for (size_t i = 0; i < len; ++i) {
3554                 const type_path_entry_t *entry = & path->path[i];
3555
3556                 type_t *type = skip_typeref(entry->type);
3557                 if (is_type_compound(type)) {
3558                         fprintf(stderr, ".%s", entry->compound_entry->base.symbol->string);
3559                 } else if (is_type_array(type)) {
3560                         fprintf(stderr, "[%u]", (unsigned) entry->index);
3561                 } else {
3562                         fprintf(stderr, "-INVALID-");
3563                 }
3564         }
3565         fprintf(stderr, "  (");
3566         print_type(path->top_type);
3567         fprintf(stderr, ")");
3568 }
3569
3570 static type_path_entry_t *get_type_path_top(const type_path_t *path)
3571 {
3572         size_t len = ARR_LEN(path->path);
3573         assert(len > 0);
3574         return & path->path[len-1];
3575 }
3576
3577 static type_path_entry_t *append_to_type_path(type_path_t *path)
3578 {
3579         size_t len = ARR_LEN(path->path);
3580         ARR_RESIZE(type_path_entry_t, path->path, len+1);
3581
3582         type_path_entry_t *result = & path->path[len];
3583         memset(result, 0, sizeof(result[0]));
3584         return result;
3585 }
3586
3587 static size_t get_compound_member_count(const compound_type_t *type)
3588 {
3589         compound_t *compound  = type->compound;
3590         size_t      n_members = 0;
3591         entity_t   *member    = compound->members.entities;
3592         for ( ; member != NULL; member = member->base.next) {
3593                 ++n_members;
3594         }
3595
3596         return n_members;
3597 }
3598
3599 static ir_initializer_t *get_initializer_entry(type_path_t *path)
3600 {
3601         type_t *orig_top_type = path->top_type;
3602         type_t *top_type      = skip_typeref(orig_top_type);
3603
3604         assert(is_type_compound(top_type) || is_type_array(top_type));
3605
3606         if (ARR_LEN(path->path) == 0) {
3607                 return NULL;
3608         } else {
3609                 type_path_entry_t *top         = get_type_path_top(path);
3610                 ir_initializer_t  *initializer = top->initializer;
3611                 return get_initializer_compound_value(initializer, top->index);
3612         }
3613 }
3614
3615 static void descend_into_subtype(type_path_t *path)
3616 {
3617         type_t *orig_top_type = path->top_type;
3618         type_t *top_type      = skip_typeref(orig_top_type);
3619
3620         assert(is_type_compound(top_type) || is_type_array(top_type));
3621
3622         ir_initializer_t *initializer = get_initializer_entry(path);
3623
3624         type_path_entry_t *top = append_to_type_path(path);
3625         top->type              = top_type;
3626
3627         size_t len;
3628
3629         if (is_type_compound(top_type)) {
3630                 compound_t *const compound = top_type->compound.compound;
3631                 entity_t   *const entry    = skip_unnamed_bitfields(compound->members.entities);
3632
3633                 top->compound_entry = entry;
3634                 top->index          = 0;
3635                 len                 = get_compound_member_count(&top_type->compound);
3636                 if (entry != NULL) {
3637                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3638                         path->top_type = entry->declaration.type;
3639                 }
3640         } else {
3641                 assert(is_type_array(top_type));
3642                 assert(top_type->array.size > 0);
3643
3644                 top->index     = 0;
3645                 path->top_type = top_type->array.element_type;
3646                 len            = top_type->array.size;
3647         }
3648         if (initializer == NULL
3649                         || get_initializer_kind(initializer) == IR_INITIALIZER_NULL) {
3650                 initializer = create_initializer_compound(len);
3651                 /* we have to set the entry at the 2nd latest path entry... */
3652                 size_t path_len = ARR_LEN(path->path);
3653                 assert(path_len >= 1);
3654                 if (path_len > 1) {
3655                         type_path_entry_t *entry        = & path->path[path_len-2];
3656                         ir_initializer_t  *tinitializer = entry->initializer;
3657                         set_initializer_compound_value(tinitializer, entry->index,
3658                                                        initializer);
3659                 }
3660         }
3661         top->initializer = initializer;
3662 }
3663
3664 static void ascend_from_subtype(type_path_t *path)
3665 {
3666         type_path_entry_t *top = get_type_path_top(path);
3667
3668         path->top_type = top->type;
3669
3670         size_t len = ARR_LEN(path->path);
3671         ARR_RESIZE(type_path_entry_t, path->path, len-1);
3672 }
3673
3674 static void walk_designator(type_path_t *path, const designator_t *designator)
3675 {
3676         /* designators start at current object type */
3677         ARR_RESIZE(type_path_entry_t, path->path, 1);
3678
3679         for ( ; designator != NULL; designator = designator->next) {
3680                 type_path_entry_t *top         = get_type_path_top(path);
3681                 type_t            *orig_type   = top->type;
3682                 type_t            *type        = skip_typeref(orig_type);
3683
3684                 if (designator->symbol != NULL) {
3685                         assert(is_type_compound(type));
3686                         size_t    index  = 0;
3687                         symbol_t *symbol = designator->symbol;
3688
3689                         compound_t *compound = type->compound.compound;
3690                         entity_t   *iter     = compound->members.entities;
3691                         for ( ; iter != NULL; iter = iter->base.next, ++index) {
3692                                 if (iter->base.symbol == symbol) {
3693                                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
3694                                         break;
3695                                 }
3696                         }
3697                         assert(iter != NULL);
3698
3699                         /* revert previous initialisations of other union elements */
3700                         if (type->kind == TYPE_COMPOUND_UNION) {
3701                                 ir_initializer_t *initializer = top->initializer;
3702                                 if (initializer != NULL
3703                                         && get_initializer_kind(initializer) == IR_INITIALIZER_COMPOUND) {
3704                                         /* are we writing to a new element? */
3705                                         ir_initializer_t *oldi
3706                                                 = get_initializer_compound_value(initializer, index);
3707                                         if (get_initializer_kind(oldi) == IR_INITIALIZER_NULL) {
3708                                                 /* clear initializer */
3709                                                 size_t len
3710                                                         = get_initializer_compound_n_entries(initializer);
3711                                                 ir_initializer_t *nulli = get_initializer_null();
3712                                                 for (size_t i = 0; i < len; ++i) {
3713                                                         set_initializer_compound_value(initializer, i,
3714                                                                                        nulli);
3715                                                 }
3716                                         }
3717                                 }
3718                         }
3719
3720                         top->type           = orig_type;
3721                         top->compound_entry = iter;
3722                         top->index          = index;
3723                         orig_type           = iter->declaration.type;
3724                 } else {
3725                         expression_t *array_index = designator->array_index;
3726                         assert(designator->array_index != NULL);
3727                         assert(is_type_array(type));
3728
3729                         long index = fold_constant_to_int(array_index);
3730                         assert(index >= 0);
3731 #ifndef NDEBUG
3732                         if (type->array.size_constant) {
3733                                 long array_size = type->array.size;
3734                                 assert(index < array_size);
3735                         }
3736 #endif
3737
3738                         top->type  = orig_type;
3739                         top->index = (size_t) index;
3740                         orig_type  = type->array.element_type;
3741                 }
3742                 path->top_type = orig_type;
3743
3744                 if (designator->next != NULL) {
3745                         descend_into_subtype(path);
3746                 }
3747         }
3748
3749         path->invalid  = false;
3750 }
3751
3752 static void advance_current_object(type_path_t *path)
3753 {
3754         if (path->invalid) {
3755                 /* TODO: handle this... */
3756                 panic("invalid initializer in ast2firm (excessive elements)");
3757         }
3758
3759         type_path_entry_t *top = get_type_path_top(path);
3760
3761         type_t *type = skip_typeref(top->type);
3762         if (is_type_union(type)) {
3763                 /* only the first element is initialized in unions */
3764                 top->compound_entry = NULL;
3765         } else if (is_type_struct(type)) {
3766                 entity_t *entry = top->compound_entry;
3767
3768                 top->index++;
3769                 entry               = skip_unnamed_bitfields(entry->base.next);
3770                 top->compound_entry = entry;
3771                 if (entry != NULL) {
3772                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3773                         path->top_type = entry->declaration.type;
3774                         return;
3775                 }
3776         } else {
3777                 assert(is_type_array(type));
3778
3779                 top->index++;
3780                 if (!type->array.size_constant || top->index < type->array.size) {
3781                         return;
3782                 }
3783         }
3784
3785         /* we're past the last member of the current sub-aggregate, try if we
3786          * can ascend in the type hierarchy and continue with another subobject */
3787         size_t len = ARR_LEN(path->path);
3788
3789         if (len > 1) {
3790                 ascend_from_subtype(path);
3791                 advance_current_object(path);
3792         } else {
3793                 path->invalid = true;
3794         }
3795 }
3796
3797
3798 static ir_initializer_t *create_ir_initializer_value(
3799                 const initializer_value_t *initializer)
3800 {
3801         if (is_type_compound(initializer->value->base.type)) {
3802                 panic("initializer creation for compounds not implemented yet");
3803         }
3804         type_t       *type = initializer->value->base.type;
3805         expression_t *expr = initializer->value;
3806         ir_node *value = expression_to_firm(expr);
3807         ir_mode *mode  = get_ir_mode_storage(type);
3808         value          = create_conv(NULL, value, mode);
3809         return create_initializer_const(value);
3810 }
3811
3812 /** test wether type can be initialized by a string constant */
3813 static bool is_string_type(type_t *type)
3814 {
3815         type_t *inner;
3816         if (is_type_pointer(type)) {
3817                 inner = skip_typeref(type->pointer.points_to);
3818         } else if(is_type_array(type)) {
3819                 inner = skip_typeref(type->array.element_type);
3820         } else {
3821                 return false;
3822         }
3823
3824         return is_type_integer(inner);
3825 }
3826
3827 static ir_initializer_t *create_ir_initializer_list(
3828                 const initializer_list_t *initializer, type_t *type)
3829 {
3830         type_path_t path;
3831         memset(&path, 0, sizeof(path));
3832         path.top_type = type;
3833         path.path     = NEW_ARR_F(type_path_entry_t, 0);
3834
3835         descend_into_subtype(&path);
3836
3837         for (size_t i = 0; i < initializer->len; ++i) {
3838                 const initializer_t *sub_initializer = initializer->initializers[i];
3839
3840                 if (sub_initializer->kind == INITIALIZER_DESIGNATOR) {
3841                         walk_designator(&path, sub_initializer->designator.designator);
3842                         continue;
3843                 }
3844
3845                 if (sub_initializer->kind == INITIALIZER_VALUE) {
3846                         /* we might have to descend into types until we're at a scalar
3847                          * type */
3848                         while(true) {
3849                                 type_t *orig_top_type = path.top_type;
3850                                 type_t *top_type      = skip_typeref(orig_top_type);
3851
3852                                 if (is_type_scalar(top_type))
3853                                         break;
3854                                 descend_into_subtype(&path);
3855                         }
3856                 } else if (sub_initializer->kind == INITIALIZER_STRING
3857                                 || sub_initializer->kind == INITIALIZER_WIDE_STRING) {
3858                         /* we might have to descend into types until we're at a scalar
3859                          * type */
3860                         while (true) {
3861                                 type_t *orig_top_type = path.top_type;
3862                                 type_t *top_type      = skip_typeref(orig_top_type);
3863
3864                                 if (is_string_type(top_type))
3865                                         break;
3866                                 descend_into_subtype(&path);
3867                         }
3868                 }
3869
3870                 ir_initializer_t *sub_irinitializer
3871                         = create_ir_initializer(sub_initializer, path.top_type);
3872
3873                 size_t path_len = ARR_LEN(path.path);
3874                 assert(path_len >= 1);
3875                 type_path_entry_t *entry        = & path.path[path_len-1];
3876                 ir_initializer_t  *tinitializer = entry->initializer;
3877                 set_initializer_compound_value(tinitializer, entry->index,
3878                                                sub_irinitializer);
3879
3880                 advance_current_object(&path);
3881         }
3882
3883         assert(ARR_LEN(path.path) >= 1);
3884         ir_initializer_t *result = path.path[0].initializer;
3885         DEL_ARR_F(path.path);
3886
3887         return result;
3888 }
3889
3890 static ir_initializer_t *create_ir_initializer_string(
3891                 const initializer_string_t *initializer, type_t *type)
3892 {
3893         type = skip_typeref(type);
3894
3895         size_t            string_len    = initializer->string.size;
3896         assert(type->kind == TYPE_ARRAY);
3897         assert(type->array.size_constant);
3898         size_t            len           = type->array.size;
3899         ir_initializer_t *irinitializer = create_initializer_compound(len);
3900
3901         const char *string = initializer->string.begin;
3902         ir_mode    *mode   = get_ir_mode_storage(type->array.element_type);
3903
3904         for (size_t i = 0; i < len; ++i) {
3905                 char c = 0;
3906                 if (i < string_len)
3907                         c = string[i];
3908
3909                 ir_tarval        *tv = new_tarval_from_long(c, mode);
3910                 ir_initializer_t *char_initializer = create_initializer_tarval(tv);
3911
3912                 set_initializer_compound_value(irinitializer, i, char_initializer);
3913         }
3914
3915         return irinitializer;
3916 }
3917
3918 static ir_initializer_t *create_ir_initializer_wide_string(
3919                 const initializer_wide_string_t *initializer, type_t *type)
3920 {
3921         assert(type->kind == TYPE_ARRAY);
3922         assert(type->array.size_constant);
3923         size_t            len           = type->array.size;
3924         size_t            string_len    = wstrlen(&initializer->string);
3925         ir_initializer_t *irinitializer = create_initializer_compound(len);
3926
3927         const char *p    = initializer->string.begin;
3928         ir_mode    *mode = get_type_mode(ir_type_wchar_t);
3929
3930         for (size_t i = 0; i < len; ++i) {
3931                 utf32 c = 0;
3932                 if (i < string_len) {
3933                         c = read_utf8_char(&p);
3934                 }
3935                 ir_tarval *tv = new_tarval_from_long(c, mode);
3936                 ir_initializer_t *char_initializer = create_initializer_tarval(tv);
3937
3938                 set_initializer_compound_value(irinitializer, i, char_initializer);
3939         }
3940
3941         return irinitializer;
3942 }
3943
3944 static ir_initializer_t *create_ir_initializer(
3945                 const initializer_t *initializer, type_t *type)
3946 {
3947         switch(initializer->kind) {
3948                 case INITIALIZER_STRING:
3949                         return create_ir_initializer_string(&initializer->string, type);
3950
3951                 case INITIALIZER_WIDE_STRING:
3952                         return create_ir_initializer_wide_string(&initializer->wide_string,
3953                                                                  type);
3954
3955                 case INITIALIZER_LIST:
3956                         return create_ir_initializer_list(&initializer->list, type);
3957
3958                 case INITIALIZER_VALUE:
3959                         return create_ir_initializer_value(&initializer->value);
3960
3961                 case INITIALIZER_DESIGNATOR:
3962                         panic("unexpected designator initializer found");
3963         }
3964         panic("unknown initializer");
3965 }
3966
3967 /** ANSI C §6.7.8:21: If there are fewer initializers [..] than there
3968  *  are elements [...] the remainder of the aggregate shall be initialized
3969  *  implicitly the same as objects that have static storage duration. */
3970 static void create_dynamic_null_initializer(ir_entity *entity, dbg_info *dbgi,
3971                 ir_node *base_addr)
3972 {
3973         /* for unions we must NOT do anything for null initializers */
3974         ir_type *owner = get_entity_owner(entity);
3975         if (is_Union_type(owner)) {
3976                 return;
3977         }
3978
3979         ir_type *ent_type = get_entity_type(entity);
3980         /* create sub-initializers for a compound type */
3981         if (is_compound_type(ent_type)) {
3982                 unsigned n_members = get_compound_n_members(ent_type);
3983                 for (unsigned n = 0; n < n_members; ++n) {
3984                         ir_entity *member = get_compound_member(ent_type, n);
3985                         ir_node   *addr   = new_d_simpleSel(dbgi, new_NoMem(), base_addr,
3986                                                                 member);
3987                         create_dynamic_null_initializer(member, dbgi, addr);
3988                 }
3989                 return;
3990         }
3991         if (is_Array_type(ent_type)) {
3992                 assert(has_array_upper_bound(ent_type, 0));
3993                 long n = get_array_upper_bound_int(ent_type, 0);
3994                 for (long i = 0; i < n; ++i) {
3995                         ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
3996                         ir_tarval *index_tv = new_tarval_from_long(i, mode_uint);
3997                         ir_node   *cnst     = new_d_Const(dbgi, index_tv);
3998                         ir_node   *in[1]    = { cnst };
3999                         ir_entity *arrent   = get_array_element_entity(ent_type);
4000                         ir_node   *addr     = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in,
4001                                                         arrent);
4002                         create_dynamic_null_initializer(arrent, dbgi, addr);
4003                 }
4004                 return;
4005         }
4006
4007         ir_mode *value_mode = get_type_mode(ent_type);
4008         ir_node *node       = new_Const(get_mode_null(value_mode));
4009
4010         /* is it a bitfield type? */
4011         if (is_Primitive_type(ent_type) &&
4012                         get_primitive_base_type(ent_type) != NULL) {
4013                 bitfield_store_to_firm(dbgi, entity, base_addr, node, false, false);
4014                 return;
4015         }
4016
4017         ir_node *mem    = get_store();
4018         ir_node *store  = new_d_Store(dbgi, mem, base_addr, node, cons_none);
4019         ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4020         set_store(proj_m);
4021 }
4022
4023 static void create_dynamic_initializer_sub(ir_initializer_t *initializer,
4024                 ir_entity *entity, ir_type *type, dbg_info *dbgi, ir_node *base_addr)
4025 {
4026         switch(get_initializer_kind(initializer)) {
4027         case IR_INITIALIZER_NULL:
4028                 create_dynamic_null_initializer(entity, dbgi, base_addr);
4029                 return;
4030         case IR_INITIALIZER_CONST: {
4031                 ir_node *node     = get_initializer_const_value(initializer);
4032                 ir_type *ent_type = get_entity_type(entity);
4033
4034                 /* is it a bitfield type? */
4035                 if (is_Primitive_type(ent_type) &&
4036                                 get_primitive_base_type(ent_type) != NULL) {
4037                         bitfield_store_to_firm(dbgi, entity, base_addr, node, false, false);
4038                         return;
4039                 }
4040
4041                 assert(get_type_mode(type) == get_irn_mode(node));
4042                 ir_node *mem    = get_store();
4043                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, node, cons_none);
4044                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4045                 set_store(proj_m);
4046                 return;
4047         }
4048         case IR_INITIALIZER_TARVAL: {
4049                 ir_tarval *tv       = get_initializer_tarval_value(initializer);
4050                 ir_node   *cnst     = new_d_Const(dbgi, tv);
4051                 ir_type   *ent_type = get_entity_type(entity);
4052
4053                 /* is it a bitfield type? */
4054                 if (is_Primitive_type(ent_type) &&
4055                                 get_primitive_base_type(ent_type) != NULL) {
4056                         bitfield_store_to_firm(dbgi, entity, base_addr, cnst, false, false);
4057                         return;
4058                 }
4059
4060                 assert(get_type_mode(type) == get_tarval_mode(tv));
4061                 ir_node *mem    = get_store();
4062                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, cnst, cons_none);
4063                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4064                 set_store(proj_m);
4065                 return;
4066         }
4067         case IR_INITIALIZER_COMPOUND: {
4068                 assert(is_compound_type(type) || is_Array_type(type));
4069                 int n_members;
4070                 if (is_Array_type(type)) {
4071                         assert(has_array_upper_bound(type, 0));
4072                         n_members = get_array_upper_bound_int(type, 0);
4073                 } else {
4074                         n_members = get_compound_n_members(type);
4075                 }
4076
4077                 if (get_initializer_compound_n_entries(initializer)
4078                                 != (unsigned) n_members)
4079                         panic("initializer doesn't match compound type");
4080
4081                 for (int i = 0; i < n_members; ++i) {
4082                         ir_node   *addr;
4083                         ir_type   *irtype;
4084                         ir_entity *sub_entity;
4085                         if (is_Array_type(type)) {
4086                                 ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
4087                                 ir_tarval *index_tv = new_tarval_from_long(i, mode_uint);
4088                                 ir_node   *cnst     = new_d_Const(dbgi, index_tv);
4089                                 ir_node   *in[1]    = { cnst };
4090                                 irtype     = get_array_element_type(type);
4091                                 sub_entity = get_array_element_entity(type);
4092                                 addr       = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in,
4093                                                        sub_entity);
4094                         } else {
4095                                 sub_entity = get_compound_member(type, i);
4096                                 irtype     = get_entity_type(sub_entity);
4097                                 addr       = new_d_simpleSel(dbgi, new_NoMem(), base_addr,
4098                                                              sub_entity);
4099                         }
4100
4101                         ir_initializer_t *sub_init
4102                                 = get_initializer_compound_value(initializer, i);
4103
4104                         create_dynamic_initializer_sub(sub_init, sub_entity, irtype, dbgi,
4105                                                        addr);
4106                 }
4107                 return;
4108         }
4109         }
4110
4111         panic("invalid IR_INITIALIZER found");
4112 }
4113
4114 static void create_dynamic_initializer(ir_initializer_t *initializer,
4115                 dbg_info *dbgi, ir_entity *entity)
4116 {
4117         ir_node *frame     = get_irg_frame(current_ir_graph);
4118         ir_node *base_addr = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
4119         ir_type *type      = get_entity_type(entity);
4120
4121         create_dynamic_initializer_sub(initializer, entity, type, dbgi, base_addr);
4122 }
4123
4124 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
4125                                      ir_entity *entity, type_t *type)
4126 {
4127         ir_node *memory = get_store();
4128         ir_node *nomem  = new_NoMem();
4129         ir_node *frame  = get_irg_frame(current_ir_graph);
4130         ir_node *addr   = new_d_simpleSel(dbgi, nomem, frame, entity);
4131
4132         if (initializer->kind == INITIALIZER_VALUE) {
4133                 initializer_value_t *initializer_value = &initializer->value;
4134
4135                 ir_node *value = expression_to_firm(initializer_value->value);
4136                 type = skip_typeref(type);
4137                 assign_value(dbgi, addr, type, value);
4138                 return;
4139         }
4140
4141         if (is_constant_initializer(initializer) == EXPR_CLASS_VARIABLE) {
4142                 ir_initializer_t *irinitializer
4143                         = create_ir_initializer(initializer, type);
4144
4145                 create_dynamic_initializer(irinitializer, dbgi, entity);
4146                 return;
4147         }
4148
4149         /* create a "template" entity which is copied to the entity on the stack */
4150         ir_entity *const init_entity
4151                 = create_initializer_entity(dbgi, initializer, type);
4152         ir_node *const src_addr = create_symconst(dbgi, init_entity);
4153         ir_type *const irtype   = get_ir_type(type);
4154         ir_node *const copyb    = new_d_CopyB(dbgi, memory, addr, src_addr, irtype);
4155
4156         ir_node *const copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
4157         set_store(copyb_mem);
4158 }
4159
4160 static void create_initializer_local_variable_entity(entity_t *entity)
4161 {
4162         assert(entity->kind == ENTITY_VARIABLE);
4163         initializer_t *initializer = entity->variable.initializer;
4164         dbg_info      *dbgi        = get_dbg_info(&entity->base.source_position);
4165         ir_entity     *irentity    = entity->variable.v.entity;
4166         type_t        *type        = entity->declaration.type;
4167
4168         create_local_initializer(initializer, dbgi, irentity, type);
4169 }
4170
4171 static void create_variable_initializer(entity_t *entity)
4172 {
4173         assert(entity->kind == ENTITY_VARIABLE);
4174         initializer_t *initializer = entity->variable.initializer;
4175         if (initializer == NULL)
4176                 return;
4177
4178         declaration_kind_t declaration_kind
4179                 = (declaration_kind_t) entity->declaration.kind;
4180         if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY) {
4181                 create_initializer_local_variable_entity(entity);
4182                 return;
4183         }
4184
4185         type_t            *type = entity->declaration.type;
4186         type_qualifiers_t  tq   = get_type_qualifier(type, true);
4187
4188         if (initializer->kind == INITIALIZER_VALUE) {
4189                 expression_t *      value     = initializer->value.value;
4190                 type_t       *const init_type = skip_typeref(value->base.type);
4191
4192                 if (!is_type_scalar(init_type)) {
4193                         /* skip convs */
4194                         while (value->kind == EXPR_UNARY_CAST)
4195                                 value = value->unary.value;
4196
4197                         if (value->kind != EXPR_COMPOUND_LITERAL)
4198                                 panic("expected non-scalar initializer to be a compound literal");
4199                         initializer = value->compound_literal.initializer;
4200                         goto have_initializer;
4201                 }
4202
4203                 ir_node  *      node = expression_to_firm(value);
4204                 dbg_info *const dbgi = get_dbg_info(&entity->base.source_position);
4205                 ir_mode  *const mode = get_ir_mode_storage(init_type);
4206                 node = create_conv(dbgi, node, mode);
4207                 node = do_strict_conv(dbgi, node);
4208
4209                 if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE) {
4210                         set_value(entity->variable.v.value_number, node);
4211                 } else {
4212                         assert(declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4213
4214                         ir_entity *irentity = entity->variable.v.entity;
4215
4216                         if (tq & TYPE_QUALIFIER_CONST
4217                                         && get_entity_owner(irentity) != get_tls_type()) {
4218                                 add_entity_linkage(irentity, IR_LINKAGE_CONSTANT);
4219                         }
4220                         set_atomic_ent_value(irentity, node);
4221                 }
4222         } else {
4223 have_initializer:
4224                 assert(declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY ||
4225                        declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4226
4227                 ir_entity        *irentity        = entity->variable.v.entity;
4228                 ir_initializer_t *irinitializer
4229                         = create_ir_initializer(initializer, type);
4230
4231                 if (tq & TYPE_QUALIFIER_CONST) {
4232                         add_entity_linkage(irentity, IR_LINKAGE_CONSTANT);
4233                 }
4234                 set_entity_initializer(irentity, irinitializer);
4235         }
4236 }
4237
4238 static void create_variable_length_array(entity_t *entity)
4239 {
4240         assert(entity->kind == ENTITY_VARIABLE);
4241         assert(entity->variable.initializer == NULL);
4242
4243         entity->declaration.kind    = DECLARATION_KIND_VARIABLE_LENGTH_ARRAY;
4244         entity->variable.v.vla_base = NULL;
4245
4246         /* TODO: record VLA somewhere so we create the free node when we leave
4247          * it's scope */
4248 }
4249
4250 static void allocate_variable_length_array(entity_t *entity)
4251 {
4252         assert(entity->kind == ENTITY_VARIABLE);
4253         assert(entity->variable.initializer == NULL);
4254         assert(currently_reachable());
4255
4256         dbg_info *dbgi      = get_dbg_info(&entity->base.source_position);
4257         type_t   *type      = entity->declaration.type;
4258         ir_type  *el_type   = get_ir_type(type->array.element_type);
4259
4260         /* make sure size_node is calculated */
4261         get_type_size_node(type);
4262         ir_node  *elems = type->array.size_node;
4263         ir_node  *mem   = get_store();
4264         ir_node  *alloc = new_d_Alloc(dbgi, mem, elems, el_type, stack_alloc);
4265
4266         ir_node  *proj_m = new_d_Proj(dbgi, alloc, mode_M, pn_Alloc_M);
4267         ir_node  *addr   = new_d_Proj(dbgi, alloc, mode_P_data, pn_Alloc_res);
4268         set_store(proj_m);
4269
4270         assert(entity->declaration.kind == DECLARATION_KIND_VARIABLE_LENGTH_ARRAY);
4271         entity->variable.v.vla_base = addr;
4272 }
4273
4274 /**
4275  * Creates a Firm local variable from a declaration.
4276  */
4277 static void create_local_variable(entity_t *entity)
4278 {
4279         assert(entity->kind == ENTITY_VARIABLE);
4280         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4281
4282         bool needs_entity = entity->variable.address_taken;
4283         type_t *type = skip_typeref(entity->declaration.type);
4284
4285         /* is it a variable length array? */
4286         if (is_type_array(type) && !type->array.size_constant) {
4287                 create_variable_length_array(entity);
4288                 return;
4289         } else if (is_type_array(type) || is_type_compound(type)) {
4290                 needs_entity = true;
4291         } else if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
4292                 needs_entity = true;
4293         }
4294
4295         if (needs_entity) {
4296                 ir_type *frame_type = get_irg_frame_type(current_ir_graph);
4297                 create_variable_entity(entity,
4298                                        DECLARATION_KIND_LOCAL_VARIABLE_ENTITY,
4299                                        frame_type);
4300         } else {
4301                 entity->declaration.kind        = DECLARATION_KIND_LOCAL_VARIABLE;
4302                 entity->variable.v.value_number = next_value_number_function;
4303                 set_irg_loc_description(current_ir_graph, next_value_number_function,
4304                                         entity);
4305                 ++next_value_number_function;
4306         }
4307 }
4308
4309 static void create_local_static_variable(entity_t *entity)
4310 {
4311         assert(entity->kind == ENTITY_VARIABLE);
4312         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4313
4314         type_t   *type           = skip_typeref(entity->declaration.type);
4315         ir_type  *const var_type = entity->variable.thread_local ?
4316                 get_tls_type() : get_glob_type();
4317         ir_type  *const irtype   = get_ir_type(type);
4318         dbg_info *const dbgi     = get_dbg_info(&entity->base.source_position);
4319
4320         size_t l = strlen(entity->base.symbol->string);
4321         char   buf[l + sizeof(".%u")];
4322         snprintf(buf, sizeof(buf), "%s.%%u", entity->base.symbol->string);
4323         ident     *const id       = id_unique(buf);
4324         ir_entity *const irentity = new_d_entity(var_type, id, irtype, dbgi);
4325
4326         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
4327                 set_entity_volatility(irentity, volatility_is_volatile);
4328         }
4329
4330         entity->declaration.kind  = DECLARATION_KIND_GLOBAL_VARIABLE;
4331         entity->variable.v.entity = irentity;
4332
4333         set_entity_ld_ident(irentity, id);
4334         set_entity_visibility(irentity, ir_visibility_local);
4335
4336         if (entity->variable.initializer == NULL) {
4337                 ir_initializer_t *null_init = get_initializer_null();
4338                 set_entity_initializer(irentity, null_init);
4339         }
4340
4341         ir_graph *const old_current_ir_graph = current_ir_graph;
4342         current_ir_graph = get_const_code_irg();
4343
4344         create_variable_initializer(entity);
4345
4346         assert(current_ir_graph == get_const_code_irg());
4347         current_ir_graph = old_current_ir_graph;
4348 }
4349
4350
4351
4352 static ir_node *return_statement_to_firm(return_statement_t *statement)
4353 {
4354         if (!currently_reachable())
4355                 return NULL;
4356
4357         dbg_info *const dbgi = get_dbg_info(&statement->base.source_position);
4358         type_t   *const type = skip_typeref(current_function_entity->declaration.type->function.return_type);
4359         ir_node  *      res  = statement->value ? expression_to_firm(statement->value) : NULL;
4360
4361         int in_len;
4362         if (!is_type_void(type)) {
4363                 ir_mode *const mode = get_ir_mode_storage(type);
4364                 if (res) {
4365                         res = create_conv(dbgi, res, mode);
4366                         res = do_strict_conv(dbgi, res);
4367                 } else {
4368                         res = new_Unknown(mode);
4369                 }
4370                 in_len = 1;
4371         } else {
4372                 in_len = 0;
4373         }
4374
4375         ir_node *const in[1] = { res };
4376         ir_node *const store = get_store();
4377         ir_node *const ret   = new_d_Return(dbgi, store, in_len, in);
4378
4379         ir_node *end_block = get_irg_end_block(current_ir_graph);
4380         add_immBlock_pred(end_block, ret);
4381
4382         set_unreachable_now();
4383         return NULL;
4384 }
4385
4386 static ir_node *expression_statement_to_firm(expression_statement_t *statement)
4387 {
4388         if (!currently_reachable())
4389                 return NULL;
4390
4391         return expression_to_firm(statement->expression);
4392 }
4393
4394 static void create_local_declarations(entity_t*);
4395
4396 static ir_node *compound_statement_to_firm(compound_statement_t *compound)
4397 {
4398         create_local_declarations(compound->scope.entities);
4399
4400         ir_node     *result    = NULL;
4401         statement_t *statement = compound->statements;
4402         for ( ; statement != NULL; statement = statement->base.next) {
4403                 result = statement_to_firm(statement);
4404         }
4405
4406         return result;
4407 }
4408
4409 static void create_global_variable(entity_t *entity)
4410 {
4411         ir_linkage          linkage    = IR_LINKAGE_DEFAULT;
4412         ir_visibility       visibility = ir_visibility_external;
4413         storage_class_tag_t storage
4414                 = (storage_class_tag_t)entity->declaration.storage_class;
4415         decl_modifiers_t    modifiers  = entity->declaration.modifiers;
4416         assert(entity->kind == ENTITY_VARIABLE);
4417
4418         switch (storage) {
4419         case STORAGE_CLASS_EXTERN: visibility = ir_visibility_external; break;
4420         case STORAGE_CLASS_STATIC: visibility = ir_visibility_local;    break;
4421         case STORAGE_CLASS_NONE:   visibility = ir_visibility_external; break;
4422         case STORAGE_CLASS_TYPEDEF:
4423         case STORAGE_CLASS_AUTO:
4424         case STORAGE_CLASS_REGISTER:
4425                 panic("invalid storage class for global var");
4426         }
4427
4428         /* "common" symbols */
4429         if (storage == STORAGE_CLASS_NONE
4430             && entity->variable.initializer == NULL
4431             && !entity->variable.thread_local
4432             && (modifiers & DM_WEAK) == 0) {
4433                 linkage |= IR_LINKAGE_MERGE;
4434         }
4435
4436         ir_type *var_type = get_glob_type();
4437         if (entity->variable.thread_local) {
4438                 var_type = get_tls_type();
4439         }
4440         create_variable_entity(entity, DECLARATION_KIND_GLOBAL_VARIABLE, var_type);
4441         ir_entity *irentity = entity->variable.v.entity;
4442         add_entity_linkage(irentity, linkage);
4443         set_entity_visibility(irentity, visibility);
4444         if (entity->variable.initializer == NULL
4445             && storage != STORAGE_CLASS_EXTERN) {
4446                 ir_initializer_t *null_init = get_initializer_null();
4447                 set_entity_initializer(irentity, null_init);
4448         }
4449 }
4450
4451 static void create_local_declaration(entity_t *entity)
4452 {
4453         assert(is_declaration(entity));
4454
4455         /* construct type */
4456         (void) get_ir_type(entity->declaration.type);
4457         if (entity->base.symbol == NULL) {
4458                 return;
4459         }
4460
4461         switch ((storage_class_tag_t) entity->declaration.storage_class) {
4462         case STORAGE_CLASS_STATIC:
4463                 if (entity->kind == ENTITY_FUNCTION) {
4464                         (void)get_function_entity(entity, NULL);
4465                 } else {
4466                         create_local_static_variable(entity);
4467                 }
4468                 return;
4469         case STORAGE_CLASS_EXTERN:
4470                 if (entity->kind == ENTITY_FUNCTION) {
4471                         assert(entity->function.statement == NULL);
4472                         (void)get_function_entity(entity, NULL);
4473                 } else {
4474                         create_global_variable(entity);
4475                         create_variable_initializer(entity);
4476                 }
4477                 return;
4478         case STORAGE_CLASS_NONE:
4479         case STORAGE_CLASS_AUTO:
4480         case STORAGE_CLASS_REGISTER:
4481                 if (entity->kind == ENTITY_FUNCTION) {
4482                         if (entity->function.statement != NULL) {
4483                                 ir_type *owner = get_irg_frame_type(current_ir_graph);
4484                                 (void)get_function_entity(entity, owner);
4485                                 entity->declaration.kind = DECLARATION_KIND_INNER_FUNCTION;
4486                                 enqueue_inner_function(entity);
4487                         } else {
4488                                 (void)get_function_entity(entity, NULL);
4489                         }
4490                 } else {
4491                         create_local_variable(entity);
4492                 }
4493                 return;
4494         case STORAGE_CLASS_TYPEDEF:
4495                 break;
4496         }
4497         panic("invalid storage class found");
4498 }
4499
4500 static void create_local_declarations(entity_t *e)
4501 {
4502         for (; e; e = e->base.next) {
4503                 if (is_declaration(e))
4504                         create_local_declaration(e);
4505         }
4506 }
4507
4508 static void initialize_local_declaration(entity_t *entity)
4509 {
4510         if (entity->base.symbol == NULL)
4511                 return;
4512
4513         // no need to emit code in dead blocks
4514         if (entity->declaration.storage_class != STORAGE_CLASS_STATIC
4515                         && !currently_reachable())
4516                 return;
4517
4518         switch ((declaration_kind_t) entity->declaration.kind) {
4519         case DECLARATION_KIND_LOCAL_VARIABLE:
4520         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY:
4521                 create_variable_initializer(entity);
4522                 return;
4523
4524         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
4525                 allocate_variable_length_array(entity);
4526                 return;
4527
4528         case DECLARATION_KIND_COMPOUND_MEMBER:
4529         case DECLARATION_KIND_GLOBAL_VARIABLE:
4530         case DECLARATION_KIND_FUNCTION:
4531         case DECLARATION_KIND_INNER_FUNCTION:
4532                 return;
4533
4534         case DECLARATION_KIND_PARAMETER:
4535         case DECLARATION_KIND_PARAMETER_ENTITY:
4536                 panic("can't initialize parameters");
4537
4538         case DECLARATION_KIND_UNKNOWN:
4539                 panic("can't initialize unknown declaration");
4540         }
4541         panic("invalid declaration kind");
4542 }
4543
4544 static ir_node *declaration_statement_to_firm(declaration_statement_t *statement)
4545 {
4546         entity_t *entity = statement->declarations_begin;
4547         if (entity == NULL)
4548                 return NULL;
4549
4550         entity_t *const last = statement->declarations_end;
4551         for ( ;; entity = entity->base.next) {
4552                 if (is_declaration(entity)) {
4553                         initialize_local_declaration(entity);
4554                 } else if (entity->kind == ENTITY_TYPEDEF) {
4555                         /* §6.7.7:3  Any array size expressions associated with variable length
4556                          * array declarators are evaluated each time the declaration of the
4557                          * typedef name is reached in the order of execution. */
4558                         type_t *const type = skip_typeref(entity->typedefe.type);
4559                         if (is_type_array(type) && type->array.is_vla)
4560                                 get_vla_size(&type->array);
4561                 }
4562                 if (entity == last)
4563                         break;
4564         }
4565
4566         return NULL;
4567 }
4568
4569 static ir_node *if_statement_to_firm(if_statement_t *statement)
4570 {
4571         create_local_declarations(statement->scope.entities);
4572
4573         /* Create the condition. */
4574         ir_node *true_block  = NULL;
4575         ir_node *false_block = NULL;
4576         if (currently_reachable()) {
4577                 true_block  = new_immBlock();
4578                 false_block = new_immBlock();
4579                 create_condition_evaluation(statement->condition, true_block, false_block);
4580                 mature_immBlock(true_block);
4581                 mature_immBlock(false_block);
4582         }
4583
4584         /* Create the true statement. */
4585         set_cur_block(true_block);
4586         statement_to_firm(statement->true_statement);
4587         ir_node *fallthrough_block = get_cur_block();
4588
4589         /* Create the false statement. */
4590         set_cur_block(false_block);
4591         if (statement->false_statement != NULL) {
4592                 statement_to_firm(statement->false_statement);
4593         }
4594
4595         /* Handle the block after the if-statement.  Minor simplification and
4596          * optimisation: Reuse the false/true block as fallthrough block, if the
4597          * true/false statement does not pass control to the fallthrough block, e.g.
4598          * in the typical if (x) return; pattern. */
4599         if (fallthrough_block) {
4600                 if (currently_reachable()) {
4601                         ir_node *const t_jump = new_r_Jmp(fallthrough_block);
4602                         ir_node *const f_jump = new_Jmp();
4603                         ir_node *const in[]   = { t_jump, f_jump };
4604                         fallthrough_block = new_Block(2, in);
4605                 }
4606                 set_cur_block(fallthrough_block);
4607         }
4608
4609         return NULL;
4610 }
4611
4612 /**
4613  * Add an unconditional jump to the target block.  If the source block is not
4614  * reachable, then a Bad predecessor is created to prevent Phi-less unreachable
4615  * loops.  This is necessary if the jump potentially enters a loop.
4616  */
4617 static void jump_to(ir_node *const target_block)
4618 {
4619         ir_node *const pred = currently_reachable() ? new_Jmp() : new_Bad(mode_X);
4620         add_immBlock_pred(target_block, pred);
4621 }
4622
4623 /**
4624  * Add an unconditional jump to the target block, if the current block is
4625  * reachable and do nothing otherwise.  This is only valid if the jump does not
4626  * enter a loop (a back edge is ok).
4627  */
4628 static void jump_if_reachable(ir_node *const target_block)
4629 {
4630         if (currently_reachable())
4631                 add_immBlock_pred(target_block, new_Jmp());
4632 }
4633
4634 static ir_node *while_statement_to_firm(while_statement_t *statement)
4635 {
4636         create_local_declarations(statement->scope.entities);
4637
4638         /* Create the header block */
4639         ir_node *const header_block = new_immBlock();
4640         jump_to(header_block);
4641
4642         /* Create the condition. */
4643         ir_node      *      body_block;
4644         ir_node      *      false_block;
4645         expression_t *const cond = statement->condition;
4646         if (is_constant_expression(cond) == EXPR_CLASS_CONSTANT &&
4647                         fold_constant_to_bool(cond)) {
4648                 /* Shortcut for while (true). */
4649                 body_block  = header_block;
4650                 false_block = NULL;
4651
4652                 keep_alive(header_block);
4653                 keep_all_memory(header_block);
4654         } else {
4655                 body_block  = new_immBlock();
4656                 false_block = new_immBlock();
4657
4658                 set_cur_block(header_block);
4659                 create_condition_evaluation(cond, body_block, false_block);
4660                 mature_immBlock(body_block);
4661         }
4662
4663         ir_node *const old_continue_label = continue_label;
4664         ir_node *const old_break_label    = break_label;
4665         continue_label = header_block;
4666         break_label    = false_block;
4667
4668         /* Create the loop body. */
4669         set_cur_block(body_block);
4670         statement_to_firm(statement->body);
4671         jump_if_reachable(header_block);
4672
4673         mature_immBlock(header_block);
4674         assert(false_block == NULL || false_block == break_label);
4675         false_block = break_label;
4676         if (false_block != NULL) {
4677                 mature_immBlock(false_block);
4678         }
4679         set_cur_block(false_block);
4680
4681         assert(continue_label == header_block);
4682         continue_label = old_continue_label;
4683         break_label    = old_break_label;
4684         return NULL;
4685 }
4686
4687 static ir_node *get_break_label(void)
4688 {
4689         if (break_label == NULL) {
4690                 break_label = new_immBlock();
4691         }
4692         return break_label;
4693 }
4694
4695 static ir_node *do_while_statement_to_firm(do_while_statement_t *statement)
4696 {
4697         create_local_declarations(statement->scope.entities);
4698
4699         /* create the header block */
4700         ir_node *header_block = new_immBlock();
4701
4702         /* the loop body */
4703         ir_node *body_block = new_immBlock();
4704         jump_to(body_block);
4705
4706         ir_node *old_continue_label = continue_label;
4707         ir_node *old_break_label    = break_label;
4708         continue_label              = header_block;
4709         break_label                 = NULL;
4710
4711         set_cur_block(body_block);
4712         statement_to_firm(statement->body);
4713         ir_node *const false_block = get_break_label();
4714
4715         assert(continue_label == header_block);
4716         continue_label = old_continue_label;
4717         break_label    = old_break_label;
4718
4719         jump_if_reachable(header_block);
4720
4721         /* create the condition */
4722         mature_immBlock(header_block);
4723         set_cur_block(header_block);
4724
4725         create_condition_evaluation(statement->condition, body_block, false_block);
4726         mature_immBlock(body_block);
4727         mature_immBlock(false_block);
4728
4729         set_cur_block(false_block);
4730         return NULL;
4731 }
4732
4733 static ir_node *for_statement_to_firm(for_statement_t *statement)
4734 {
4735         create_local_declarations(statement->scope.entities);
4736
4737         if (currently_reachable()) {
4738                 entity_t *entity = statement->scope.entities;
4739                 for ( ; entity != NULL; entity = entity->base.next) {
4740                         if (!is_declaration(entity))
4741                                 continue;
4742
4743                         initialize_local_declaration(entity);
4744                 }
4745
4746                 if (statement->initialisation != NULL) {
4747                         expression_to_firm(statement->initialisation);
4748                 }
4749         }
4750
4751         /* Create the header block */
4752         ir_node *const header_block = new_immBlock();
4753         jump_to(header_block);
4754
4755         /* Create the condition. */
4756         ir_node *body_block;
4757         ir_node *false_block;
4758         if (statement->condition != NULL) {
4759                 body_block  = new_immBlock();
4760                 false_block = new_immBlock();
4761
4762                 set_cur_block(header_block);
4763                 create_condition_evaluation(statement->condition, body_block, false_block);
4764                 mature_immBlock(body_block);
4765         } else {
4766                 /* for-ever. */
4767                 body_block  = header_block;
4768                 false_block = NULL;
4769
4770                 keep_alive(header_block);
4771                 keep_all_memory(header_block);
4772         }
4773
4774         /* Create the step block, if necessary. */
4775         ir_node      *      step_block = header_block;
4776         expression_t *const step       = statement->step;
4777         if (step != NULL) {
4778                 step_block = new_immBlock();
4779         }
4780
4781         ir_node *const old_continue_label = continue_label;
4782         ir_node *const old_break_label    = break_label;
4783         continue_label = step_block;
4784         break_label    = false_block;
4785
4786         /* Create the loop body. */
4787         set_cur_block(body_block);
4788         statement_to_firm(statement->body);
4789         jump_if_reachable(step_block);
4790
4791         /* Create the step code. */
4792         if (step != NULL) {
4793                 mature_immBlock(step_block);
4794                 set_cur_block(step_block);
4795                 expression_to_firm(step);
4796                 jump_if_reachable(header_block);
4797         }
4798
4799         mature_immBlock(header_block);
4800         assert(false_block == NULL || false_block == break_label);
4801         false_block = break_label;
4802         if (false_block != NULL) {
4803                 mature_immBlock(false_block);
4804         }
4805         set_cur_block(false_block);
4806
4807         assert(continue_label == step_block);
4808         continue_label = old_continue_label;
4809         break_label    = old_break_label;
4810         return NULL;
4811 }
4812
4813 static ir_node *create_jump_statement(const statement_t *statement, ir_node *target_block)
4814 {
4815         if (!currently_reachable())
4816                 return NULL;
4817
4818         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
4819         ir_node  *jump = new_d_Jmp(dbgi);
4820         add_immBlock_pred(target_block, jump);
4821
4822         set_unreachable_now();
4823         return NULL;
4824 }
4825
4826 static ir_switch_table *create_switch_table(const switch_statement_t *statement)
4827 {
4828         /* determine number of cases */
4829         size_t n_cases = 0;
4830         for (case_label_statement_t *l = statement->first_case; l != NULL;
4831              l = l->next) {
4832                 /* default case */
4833                 if (l->expression == NULL)
4834                         continue;
4835                 if (l->is_empty_range)
4836                         continue;
4837                 ++n_cases;
4838         }
4839
4840         ir_switch_table *res = ir_new_switch_table(current_ir_graph, n_cases);
4841         size_t           i   = 0;
4842         for (case_label_statement_t *l = statement->first_case; l != NULL;
4843              l = l->next) {
4844             if (l->expression == NULL) {
4845                         l->pn = pn_Switch_default;
4846                         continue;
4847                 }
4848                 if (l->is_empty_range)
4849                         continue;
4850                 ir_tarval *min = fold_constant_to_tarval(l->expression);
4851                 ir_tarval *max = min;
4852                 long       pn  = (long) i+1;
4853                 if (l->end_range != NULL)
4854                         max = fold_constant_to_tarval(l->end_range);
4855                 ir_switch_table_set(res, i++, min, max, pn);
4856                 l->pn = pn;
4857         }
4858         return res;
4859 }
4860
4861 static ir_node *switch_statement_to_firm(switch_statement_t *statement)
4862 {
4863         dbg_info *dbgi        = get_dbg_info(&statement->base.source_position);
4864         ir_node  *switch_node = NULL;
4865
4866         if (currently_reachable()) {
4867                 ir_node *expression = expression_to_firm(statement->expression);
4868                 ir_switch_table *table = create_switch_table(statement);
4869                 unsigned n_outs = (unsigned)ir_switch_table_get_n_entries(table) + 1;
4870
4871                 switch_node = new_d_Switch(dbgi, expression, n_outs, table);
4872         }
4873
4874         set_unreachable_now();
4875
4876         ir_node *const old_switch            = current_switch;
4877         ir_node *const old_break_label       = break_label;
4878         const bool     old_saw_default_label = saw_default_label;
4879         saw_default_label                    = false;
4880         current_switch                       = switch_node;
4881         break_label                          = NULL;
4882
4883         statement_to_firm(statement->body);
4884
4885         if (currently_reachable()) {
4886                 add_immBlock_pred(get_break_label(), new_Jmp());
4887         }
4888
4889         if (!saw_default_label && switch_node) {
4890                 ir_node *proj = new_d_Proj(dbgi, switch_node, mode_X, pn_Switch_default);
4891                 add_immBlock_pred(get_break_label(), proj);
4892         }
4893
4894         if (break_label != NULL) {
4895                 mature_immBlock(break_label);
4896         }
4897         set_cur_block(break_label);
4898
4899         assert(current_switch == switch_node);
4900         current_switch    = old_switch;
4901         break_label       = old_break_label;
4902         saw_default_label = old_saw_default_label;
4903         return NULL;
4904 }
4905
4906 static ir_node *case_label_to_firm(const case_label_statement_t *statement)
4907 {
4908         if (statement->is_empty_range)
4909                 return NULL;
4910
4911         if (current_switch != NULL) {
4912                 ir_node *block = new_immBlock();
4913                 /* Fallthrough from previous case */
4914                 jump_if_reachable(block);
4915
4916                 ir_node  *const proj = new_Proj(current_switch, mode_X, statement->pn);
4917                 add_immBlock_pred(block, proj);
4918                 if (statement->expression == NULL)
4919                         saw_default_label = true;
4920
4921                 mature_immBlock(block);
4922                 set_cur_block(block);
4923         }
4924
4925         return statement_to_firm(statement->statement);
4926 }
4927
4928 static ir_node *label_to_firm(const label_statement_t *statement)
4929 {
4930         ir_node *block = get_label_block(statement->label);
4931         jump_to(block);
4932
4933         set_cur_block(block);
4934         keep_alive(block);
4935         keep_all_memory(block);
4936
4937         return statement_to_firm(statement->statement);
4938 }
4939
4940 static ir_node *computed_goto_to_firm(computed_goto_statement_t const *const statement)
4941 {
4942         if (!currently_reachable())
4943                 return NULL;
4944
4945         ir_node  *const irn  = expression_to_firm(statement->expression);
4946         dbg_info *const dbgi = get_dbg_info(&statement->base.source_position);
4947         ir_node  *const ijmp = new_d_IJmp(dbgi, irn);
4948
4949         set_irn_link(ijmp, ijmp_list);
4950         ijmp_list = ijmp;
4951
4952         set_unreachable_now();
4953         return NULL;
4954 }
4955
4956 static ir_node *asm_statement_to_firm(const asm_statement_t *statement)
4957 {
4958         bool needs_memory = false;
4959
4960         if (statement->is_volatile) {
4961                 needs_memory = true;
4962         }
4963
4964         size_t         n_clobbers = 0;
4965         asm_clobber_t *clobber    = statement->clobbers;
4966         for ( ; clobber != NULL; clobber = clobber->next) {
4967                 const char *clobber_str = clobber->clobber.begin;
4968
4969                 if (!be_is_valid_clobber(clobber_str)) {
4970                         errorf(&statement->base.source_position,
4971                                    "invalid clobber '%s' specified", clobber->clobber);
4972                         continue;
4973                 }
4974
4975                 if (streq(clobber_str, "memory")) {
4976                         needs_memory = true;
4977                         continue;
4978                 }
4979
4980                 ident *id = new_id_from_str(clobber_str);
4981                 obstack_ptr_grow(&asm_obst, id);
4982                 ++n_clobbers;
4983         }
4984         assert(obstack_object_size(&asm_obst) == n_clobbers * sizeof(ident*));
4985         ident **clobbers = NULL;
4986         if (n_clobbers > 0) {
4987                 clobbers = obstack_finish(&asm_obst);
4988         }
4989
4990         size_t n_inputs  = 0;
4991         asm_argument_t *argument = statement->inputs;
4992         for ( ; argument != NULL; argument = argument->next)
4993                 n_inputs++;
4994         size_t n_outputs = 0;
4995         argument = statement->outputs;
4996         for ( ; argument != NULL; argument = argument->next)
4997                 n_outputs++;
4998
4999         unsigned next_pos = 0;
5000
5001         ir_node *ins[n_inputs + n_outputs + 1];
5002         size_t   in_size = 0;
5003
5004         ir_asm_constraint tmp_in_constraints[n_outputs];
5005
5006         const expression_t *out_exprs[n_outputs];
5007         ir_node            *out_addrs[n_outputs];
5008         size_t              out_size = 0;
5009
5010         argument = statement->outputs;
5011         for ( ; argument != NULL; argument = argument->next) {
5012                 const char *constraints = argument->constraints.begin;
5013                 asm_constraint_flags_t asm_flags
5014                         = be_parse_asm_constraints(constraints);
5015
5016                 {
5017                         source_position_t const *const pos = &statement->base.source_position;
5018                         if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
5019                                 warningf(WARN_OTHER, pos, "some constraints in '%s' are not supported", constraints);
5020                         }
5021                         if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
5022                                 errorf(pos, "some constraints in '%s' are invalid", constraints);
5023                                 continue;
5024                         }
5025                         if (! (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE)) {
5026                                 errorf(pos, "no write flag specified for output constraints '%s'", constraints);
5027                                 continue;
5028                         }
5029                 }
5030
5031                 unsigned pos = next_pos++;
5032                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
5033                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
5034                         expression_t *expr = argument->expression;
5035                         ir_node      *addr = expression_to_addr(expr);
5036                         /* in+output, construct an artifical same_as constraint on the
5037                          * input */
5038                         if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_READ) {
5039                                 char     buf[64];
5040                                 ir_node *value = get_value_from_lvalue(expr, addr);
5041
5042                                 snprintf(buf, sizeof(buf), "%u", (unsigned) out_size);
5043
5044                                 ir_asm_constraint constraint;
5045                                 constraint.pos              = pos;
5046                                 constraint.constraint       = new_id_from_str(buf);
5047                                 constraint.mode             = get_ir_mode_storage(expr->base.type);
5048                                 tmp_in_constraints[in_size] = constraint;
5049                                 ins[in_size] = value;
5050
5051                                 ++in_size;
5052                         }
5053
5054                         out_exprs[out_size] = expr;
5055                         out_addrs[out_size] = addr;
5056                         ++out_size;
5057                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
5058                         /* pure memory ops need no input (but we have to make sure we
5059                          * attach to the memory) */
5060                         assert(! (asm_flags &
5061                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
5062                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
5063                         needs_memory = true;
5064
5065                         /* we need to attach the address to the inputs */
5066                         expression_t *expr = argument->expression;
5067
5068                         ir_asm_constraint constraint;
5069                         constraint.pos              = pos;
5070                         constraint.constraint       = new_id_from_str(constraints);
5071                         constraint.mode             = mode_M;
5072                         tmp_in_constraints[in_size] = constraint;
5073
5074                         ins[in_size]          = expression_to_addr(expr);
5075                         ++in_size;
5076                         continue;
5077                 } else {
5078                         errorf(&statement->base.source_position,
5079                                "only modifiers but no place set in constraints '%s'",
5080                                constraints);
5081                         continue;
5082                 }
5083
5084                 ir_asm_constraint constraint;
5085                 constraint.pos        = pos;
5086                 constraint.constraint = new_id_from_str(constraints);
5087                 constraint.mode       = get_ir_mode_storage(argument->expression->base.type);
5088
5089                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5090         }
5091         assert(obstack_object_size(&asm_obst)
5092                         == out_size * sizeof(ir_asm_constraint));
5093         ir_asm_constraint *output_constraints = obstack_finish(&asm_obst);
5094
5095
5096         obstack_grow(&asm_obst, tmp_in_constraints,
5097                      in_size * sizeof(tmp_in_constraints[0]));
5098         /* find and count input and output arguments */
5099         argument = statement->inputs;
5100         for ( ; argument != NULL; argument = argument->next) {
5101                 const char *constraints = argument->constraints.begin;
5102                 asm_constraint_flags_t asm_flags
5103                         = be_parse_asm_constraints(constraints);
5104
5105                 if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
5106                         errorf(&statement->base.source_position,
5107                                "some constraints in '%s' are not supported", constraints);
5108                         continue;
5109                 }
5110                 if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
5111                         errorf(&statement->base.source_position,
5112                                "some constraints in '%s' are invalid", constraints);
5113                         continue;
5114                 }
5115                 if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE) {
5116                         errorf(&statement->base.source_position,
5117                                "write flag specified for input constraints '%s'",
5118                                constraints);
5119                         continue;
5120                 }
5121
5122                 ir_node *input;
5123                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
5124                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
5125                         /* we can treat this as "normal" input */
5126                         input = expression_to_firm(argument->expression);
5127                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
5128                         /* pure memory ops need no input (but we have to make sure we
5129                          * attach to the memory) */
5130                         assert(! (asm_flags &
5131                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
5132                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
5133                         needs_memory = true;
5134                         input = expression_to_addr(argument->expression);
5135                 } else {
5136                         errorf(&statement->base.source_position,
5137                                "only modifiers but no place set in constraints '%s'",
5138                                constraints);
5139                         continue;
5140                 }
5141
5142                 ir_asm_constraint constraint;
5143                 constraint.pos        = next_pos++;
5144                 constraint.constraint = new_id_from_str(constraints);
5145                 constraint.mode       = get_irn_mode(input);
5146
5147                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5148                 ins[in_size++] = input;
5149         }
5150
5151         if (needs_memory) {
5152                 ir_asm_constraint constraint;
5153                 constraint.pos        = next_pos++;
5154                 constraint.constraint = new_id_from_str("");
5155                 constraint.mode       = mode_M;
5156
5157                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5158                 ins[in_size++] = get_store();
5159         }
5160
5161         assert(obstack_object_size(&asm_obst)
5162                         == in_size * sizeof(ir_asm_constraint));
5163         ir_asm_constraint *input_constraints = obstack_finish(&asm_obst);
5164
5165         /* create asm node */
5166         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
5167
5168         ident *asm_text = new_id_from_str(statement->asm_text.begin);
5169
5170         ir_node *node = new_d_ASM(dbgi, in_size, ins, input_constraints,
5171                                   out_size, output_constraints,
5172                                   n_clobbers, clobbers, asm_text);
5173
5174         if (statement->is_volatile) {
5175                 set_irn_pinned(node, op_pin_state_pinned);
5176         } else {
5177                 set_irn_pinned(node, op_pin_state_floats);
5178         }
5179
5180         /* create output projs & connect them */
5181         if (needs_memory) {
5182                 ir_node *projm = new_Proj(node, mode_M, out_size);
5183                 set_store(projm);
5184         }
5185
5186         size_t i;
5187         for (i = 0; i < out_size; ++i) {
5188                 const expression_t *out_expr = out_exprs[i];
5189                 long                pn       = i;
5190                 ir_mode            *mode     = get_ir_mode_storage(out_expr->base.type);
5191                 ir_node            *proj     = new_Proj(node, mode, pn);
5192                 ir_node            *addr     = out_addrs[i];
5193
5194                 set_value_for_expression_addr(out_expr, proj, addr);
5195         }
5196
5197         return NULL;
5198 }
5199
5200 static ir_node *ms_try_statement_to_firm(ms_try_statement_t *statement)
5201 {
5202         statement_to_firm(statement->try_statement);
5203         source_position_t const *const pos = &statement->base.source_position;
5204         warningf(WARN_OTHER, pos, "structured exception handling ignored");
5205         return NULL;
5206 }
5207
5208 static ir_node *leave_statement_to_firm(leave_statement_t *statement)
5209 {
5210         errorf(&statement->base.source_position, "__leave not supported yet");
5211         return NULL;
5212 }
5213
5214 /**
5215  * Transform a statement.
5216  */
5217 static ir_node *statement_to_firm(statement_t *const stmt)
5218 {
5219 #ifndef NDEBUG
5220         assert(!stmt->base.transformed);
5221         stmt->base.transformed = true;
5222 #endif
5223
5224         switch (stmt->kind) {
5225         case STATEMENT_ASM:           return asm_statement_to_firm(        &stmt->asms);
5226         case STATEMENT_CASE_LABEL:    return case_label_to_firm(           &stmt->case_label);
5227         case STATEMENT_COMPOUND:      return compound_statement_to_firm(   &stmt->compound);
5228         case STATEMENT_COMPUTED_GOTO: return computed_goto_to_firm(        &stmt->computed_goto);
5229         case STATEMENT_DECLARATION:   return declaration_statement_to_firm(&stmt->declaration);
5230         case STATEMENT_DO_WHILE:      return do_while_statement_to_firm(   &stmt->do_while);
5231         case STATEMENT_EMPTY:         return NULL; /* nothing */
5232         case STATEMENT_EXPRESSION:    return expression_statement_to_firm( &stmt->expression);
5233         case STATEMENT_FOR:           return for_statement_to_firm(        &stmt->fors);
5234         case STATEMENT_IF:            return if_statement_to_firm(         &stmt->ifs);
5235         case STATEMENT_LABEL:         return label_to_firm(                &stmt->label);
5236         case STATEMENT_LEAVE:         return leave_statement_to_firm(      &stmt->leave);
5237         case STATEMENT_MS_TRY:        return ms_try_statement_to_firm(     &stmt->ms_try);
5238         case STATEMENT_RETURN:        return return_statement_to_firm(     &stmt->returns);
5239         case STATEMENT_SWITCH:        return switch_statement_to_firm(     &stmt->switchs);
5240         case STATEMENT_WHILE:         return while_statement_to_firm(      &stmt->whiles);
5241
5242         case STATEMENT_BREAK:         return create_jump_statement(stmt, get_break_label());
5243         case STATEMENT_CONTINUE:      return create_jump_statement(stmt, continue_label);
5244         case STATEMENT_GOTO:          return create_jump_statement(stmt, get_label_block(stmt->gotos.label));
5245
5246         case STATEMENT_ERROR: panic("error statement found");
5247         }
5248         panic("statement not implemented");
5249 }
5250
5251 static int count_local_variables(const entity_t *entity,
5252                                  const entity_t *const last)
5253 {
5254         int count = 0;
5255         entity_t const *const end = last != NULL ? last->base.next : NULL;
5256         for (; entity != end; entity = entity->base.next) {
5257                 if ((entity->kind == ENTITY_VARIABLE || entity->kind == ENTITY_PARAMETER) &&
5258                     !entity->variable.address_taken                                       &&
5259                     is_type_scalar(skip_typeref(entity->declaration.type)))
5260                         ++count;
5261         }
5262         return count;
5263 }
5264
5265 static void count_local_variables_in_stmt(statement_t *stmt, void *const env)
5266 {
5267         int *const count = env;
5268
5269         switch (stmt->kind) {
5270         case STATEMENT_DECLARATION: {
5271                 const declaration_statement_t *const decl_stmt = &stmt->declaration;
5272                 *count += count_local_variables(decl_stmt->declarations_begin,
5273                                 decl_stmt->declarations_end);
5274                 break;
5275         }
5276
5277         case STATEMENT_FOR:
5278                 *count += count_local_variables(stmt->fors.scope.entities, NULL);
5279                 break;
5280
5281         default:
5282                 break;
5283         }
5284 }
5285
5286 /**
5287  * Return the number of local (alias free) variables used by a function.
5288  */
5289 static int get_function_n_local_vars(entity_t *entity)
5290 {
5291         const function_t *function = &entity->function;
5292         int count = 0;
5293
5294         /* count parameters */
5295         count += count_local_variables(function->parameters.entities, NULL);
5296
5297         /* count local variables declared in body */
5298         walk_statements(function->statement, count_local_variables_in_stmt, &count);
5299         return count;
5300 }
5301
5302 /**
5303  * Build Firm code for the parameters of a function.
5304  */
5305 static void initialize_function_parameters(entity_t *entity)
5306 {
5307         assert(entity->kind == ENTITY_FUNCTION);
5308         ir_graph *irg             = current_ir_graph;
5309         ir_node  *args            = get_irg_args(irg);
5310         int       n               = 0;
5311         ir_type  *function_irtype;
5312
5313         if (entity->function.need_closure) {
5314                 /* add an extra parameter for the static link */
5315                 entity->function.static_link = new_r_Proj(args, mode_P_data, 0);
5316                 ++n;
5317
5318                 /* Matze: IMO this is wrong, nested functions should have an own
5319                  * type and not rely on strange parameters... */
5320                 function_irtype = create_method_type(&entity->declaration.type->function, true);
5321         } else {
5322                 function_irtype = get_ir_type(entity->declaration.type);
5323         }
5324
5325
5326
5327         entity_t *parameter = entity->function.parameters.entities;
5328         for ( ; parameter != NULL; parameter = parameter->base.next, ++n) {
5329                 if (parameter->kind != ENTITY_PARAMETER)
5330                         continue;
5331
5332                 assert(parameter->declaration.kind == DECLARATION_KIND_UNKNOWN);
5333                 type_t *type = skip_typeref(parameter->declaration.type);
5334
5335                 assert(!is_type_array(type));
5336                 bool const needs_entity = parameter->variable.address_taken || is_type_compound(type);
5337
5338                 ir_type *param_irtype = get_method_param_type(function_irtype, n);
5339                 if (needs_entity) {
5340                         ir_type   *frame_type = get_irg_frame_type(irg);
5341                         ir_entity *param
5342                                 = new_parameter_entity(frame_type, n, param_irtype);
5343                         parameter->declaration.kind  = DECLARATION_KIND_PARAMETER_ENTITY;
5344                         parameter->variable.v.entity = param;
5345                         continue;
5346                 }
5347
5348                 ir_mode *param_mode = get_type_mode(param_irtype);
5349                 long     pn         = n;
5350                 ir_node *value      = new_r_Proj(args, param_mode, pn);
5351
5352                 ir_mode *mode = get_ir_mode_storage(type);
5353                 value = create_conv(NULL, value, mode);
5354                 value = do_strict_conv(NULL, value);
5355
5356                 parameter->declaration.kind        = DECLARATION_KIND_PARAMETER;
5357                 parameter->variable.v.value_number = next_value_number_function;
5358                 set_irg_loc_description(current_ir_graph, next_value_number_function,
5359                                         parameter);
5360                 ++next_value_number_function;
5361
5362                 set_value(parameter->variable.v.value_number, value);
5363         }
5364 }
5365
5366 /**
5367  * Handle additional decl modifiers for IR-graphs
5368  *
5369  * @param irg            the IR-graph
5370  * @param dec_modifiers  additional modifiers
5371  */
5372 static void handle_decl_modifier_irg(ir_graph *irg,
5373                                      decl_modifiers_t decl_modifiers)
5374 {
5375         if (decl_modifiers & DM_NAKED) {
5376                 /* TRUE if the declaration includes the Microsoft
5377                    __declspec(naked) specifier. */
5378                 add_irg_additional_properties(irg, mtp_property_naked);
5379         }
5380         if (decl_modifiers & DM_FORCEINLINE) {
5381                 /* TRUE if the declaration includes the
5382                    Microsoft __forceinline specifier. */
5383                 set_irg_inline_property(irg, irg_inline_forced);
5384         }
5385         if (decl_modifiers & DM_NOINLINE) {
5386                 /* TRUE if the declaration includes the Microsoft
5387                    __declspec(noinline) specifier. */
5388                 set_irg_inline_property(irg, irg_inline_forbidden);
5389         }
5390 }
5391
5392 static void add_function_pointer(ir_type *segment, ir_entity *method,
5393                                  const char *unique_template)
5394 {
5395         ir_type   *method_type  = get_entity_type(method);
5396         ir_type   *ptr_type     = new_type_pointer(method_type);
5397
5398         /* these entities don't really have a name but firm only allows
5399          * "" in ld_ident.
5400          * Note that we mustn't give these entities a name since for example
5401          * Mach-O doesn't allow them. */
5402         ident     *ide          = id_unique(unique_template);
5403         ir_entity *ptr          = new_entity(segment, ide, ptr_type);
5404         ir_graph  *irg          = get_const_code_irg();
5405         ir_node   *val          = new_rd_SymConst_addr_ent(NULL, irg, mode_P_code,
5406                                                            method);
5407
5408         set_entity_ld_ident(ptr, new_id_from_chars("", 0));
5409         set_entity_compiler_generated(ptr, 1);
5410         set_entity_visibility(ptr, ir_visibility_private);
5411         add_entity_linkage(ptr, IR_LINKAGE_CONSTANT|IR_LINKAGE_HIDDEN_USER);
5412         set_atomic_ent_value(ptr, val);
5413 }
5414
5415 /**
5416  * Generate possible IJmp branches to a given label block.
5417  */
5418 static void gen_ijmp_branches(ir_node *block)
5419 {
5420         ir_node *ijmp;
5421         for (ijmp = ijmp_list; ijmp != NULL; ijmp = get_irn_link(ijmp)) {
5422                 add_immBlock_pred(block, ijmp);
5423         }
5424 }
5425
5426 /**
5427  * Create code for a function and all inner functions.
5428  *
5429  * @param entity  the function entity
5430  */
5431 static void create_function(entity_t *entity)
5432 {
5433         assert(entity->kind == ENTITY_FUNCTION);
5434         ir_entity *function_entity = get_function_entity(entity, current_outer_frame);
5435
5436         if (entity->function.statement == NULL)
5437                 return;
5438
5439         inner_functions     = NULL;
5440         current_trampolines = NULL;
5441
5442         if (entity->declaration.modifiers & DM_CONSTRUCTOR) {
5443                 ir_type *segment = get_segment_type(IR_SEGMENT_CONSTRUCTORS);
5444                 add_function_pointer(segment, function_entity, "constructor_ptr.%u");
5445         }
5446         if (entity->declaration.modifiers & DM_DESTRUCTOR) {
5447                 ir_type *segment = get_segment_type(IR_SEGMENT_DESTRUCTORS);
5448                 add_function_pointer(segment, function_entity, "destructor_ptr.%u");
5449         }
5450
5451         current_function_entity = entity;
5452         current_function_name   = NULL;
5453         current_funcsig         = NULL;
5454
5455         assert(all_labels == NULL);
5456         all_labels = NEW_ARR_F(label_t *, 0);
5457         ijmp_list  = NULL;
5458
5459         int       n_local_vars = get_function_n_local_vars(entity);
5460         ir_graph *irg          = new_ir_graph(function_entity, n_local_vars);
5461         current_ir_graph = irg;
5462
5463         ir_graph *old_current_function = current_function;
5464         current_function = irg;
5465
5466         ir_entity *const old_current_vararg_entity = current_vararg_entity;
5467         current_vararg_entity = NULL;
5468
5469         set_irg_fp_model(irg, firm_fp_model);
5470         tarval_enable_fp_ops(1);
5471         set_irn_dbg_info(get_irg_start_block(irg),
5472                          get_entity_dbg_info(function_entity));
5473
5474         /* set inline flags */
5475         if (entity->function.is_inline)
5476                 set_irg_inline_property(irg, irg_inline_recomended);
5477         handle_decl_modifier_irg(irg, entity->declaration.modifiers);
5478
5479         next_value_number_function = 0;
5480         initialize_function_parameters(entity);
5481         current_static_link = entity->function.static_link;
5482
5483         statement_to_firm(entity->function.statement);
5484
5485         ir_node *end_block = get_irg_end_block(irg);
5486
5487         /* do we have a return statement yet? */
5488         if (currently_reachable()) {
5489                 type_t *type = skip_typeref(entity->declaration.type);
5490                 assert(is_type_function(type));
5491                 type_t *const return_type = skip_typeref(type->function.return_type);
5492
5493                 ir_node *ret;
5494                 if (is_type_void(return_type)) {
5495                         ret = new_Return(get_store(), 0, NULL);
5496                 } else {
5497                         ir_mode *const mode = get_ir_mode_storage(return_type);
5498
5499                         ir_node *in[1];
5500                         /* §5.1.2.2.3 main implicitly returns 0 */
5501                         if (is_main(entity)) {
5502                                 in[0] = new_Const(get_mode_null(mode));
5503                         } else {
5504                                 in[0] = new_Unknown(mode);
5505                         }
5506                         ret = new_Return(get_store(), 1, in);
5507                 }
5508                 add_immBlock_pred(end_block, ret);
5509         }
5510
5511         for (int i = ARR_LEN(all_labels) - 1; i >= 0; --i) {
5512                 label_t *label = all_labels[i];
5513                 if (label->address_taken) {
5514                         gen_ijmp_branches(label->block);
5515                 }
5516                 mature_immBlock(label->block);
5517         }
5518
5519         DEL_ARR_F(all_labels);
5520         all_labels = NULL;
5521
5522         irg_finalize_cons(irg);
5523
5524         /* finalize the frame type */
5525         ir_type *frame_type = get_irg_frame_type(irg);
5526         int      n          = get_compound_n_members(frame_type);
5527         int      align_all  = 4;
5528         int      offset     = 0;
5529         for (int i = 0; i < n; ++i) {
5530                 ir_entity *member      = get_compound_member(frame_type, i);
5531                 ir_type   *entity_type = get_entity_type(member);
5532
5533                 int align = get_type_alignment_bytes(entity_type);
5534                 if (align > align_all)
5535                         align_all = align;
5536                 int misalign = 0;
5537                 if (align > 0) {
5538                         misalign  = offset % align;
5539                         if (misalign > 0) {
5540                                 offset += align - misalign;
5541                         }
5542                 }
5543
5544                 set_entity_offset(member, offset);
5545                 offset += get_type_size_bytes(entity_type);
5546         }
5547         set_type_size_bytes(frame_type, offset);
5548         set_type_alignment_bytes(frame_type, align_all);
5549
5550         irg_verify(irg, VERIFY_ENFORCE_SSA);
5551         current_vararg_entity = old_current_vararg_entity;
5552         current_function      = old_current_function;
5553
5554         if (current_trampolines != NULL) {
5555                 DEL_ARR_F(current_trampolines);
5556                 current_trampolines = NULL;
5557         }
5558
5559         /* create inner functions if any */
5560         entity_t **inner = inner_functions;
5561         if (inner != NULL) {
5562                 ir_type *rem_outer_frame      = current_outer_frame;
5563                 current_outer_frame           = get_irg_frame_type(current_ir_graph);
5564                 for (int i = ARR_LEN(inner) - 1; i >= 0; --i) {
5565                         create_function(inner[i]);
5566                 }
5567                 DEL_ARR_F(inner);
5568
5569                 current_outer_frame      = rem_outer_frame;
5570         }
5571 }
5572
5573 static void scope_to_firm(scope_t *scope)
5574 {
5575         /* first pass: create declarations */
5576         entity_t *entity = scope->entities;
5577         for ( ; entity != NULL; entity = entity->base.next) {
5578                 if (entity->base.symbol == NULL)
5579                         continue;
5580
5581                 if (entity->kind == ENTITY_FUNCTION) {
5582                         if (entity->function.btk != BUILTIN_NONE) {
5583                                 /* builtins have no representation */
5584                                 continue;
5585                         }
5586                         (void)get_function_entity(entity, NULL);
5587                 } else if (entity->kind == ENTITY_VARIABLE) {
5588                         create_global_variable(entity);
5589                 } else if (entity->kind == ENTITY_NAMESPACE) {
5590                         scope_to_firm(&entity->namespacee.members);
5591                 }
5592         }
5593
5594         /* second pass: create code/initializers */
5595         entity = scope->entities;
5596         for ( ; entity != NULL; entity = entity->base.next) {
5597                 if (entity->base.symbol == NULL)
5598                         continue;
5599
5600                 if (entity->kind == ENTITY_FUNCTION) {
5601                         if (entity->function.btk != BUILTIN_NONE) {
5602                                 /* builtins have no representation */
5603                                 continue;
5604                         }
5605                         create_function(entity);
5606                 } else if (entity->kind == ENTITY_VARIABLE) {
5607                         assert(entity->declaration.kind
5608                                         == DECLARATION_KIND_GLOBAL_VARIABLE);
5609                         current_ir_graph = get_const_code_irg();
5610                         create_variable_initializer(entity);
5611                 }
5612         }
5613 }
5614
5615 void init_ast2firm(void)
5616 {
5617         obstack_init(&asm_obst);
5618         init_atomic_modes();
5619
5620         ir_set_debug_retrieve(dbg_retrieve);
5621         ir_set_type_debug_retrieve(dbg_print_type_dbg_info);
5622
5623         /* create idents for all known runtime functions */
5624         for (size_t i = 0; i < lengthof(rts_data); ++i) {
5625                 rts_idents[i] = new_id_from_str(rts_data[i].name);
5626         }
5627
5628         entitymap_init(&entitymap);
5629 }
5630
5631 static void init_ir_types(void)
5632 {
5633         static int ir_types_initialized = 0;
5634         if (ir_types_initialized)
5635                 return;
5636         ir_types_initialized = 1;
5637
5638         ir_type_char    = get_ir_type(type_char);
5639         ir_type_wchar_t = get_ir_type(type_wchar_t);
5640
5641         be_params             = be_get_backend_param();
5642         mode_float_arithmetic = be_params->mode_float_arithmetic;
5643
5644         stack_param_align     = be_params->stack_param_align;
5645 }
5646
5647 void exit_ast2firm(void)
5648 {
5649         entitymap_destroy(&entitymap);
5650         obstack_free(&asm_obst, NULL);
5651 }
5652
5653 static void global_asm_to_firm(statement_t *s)
5654 {
5655         for (; s != NULL; s = s->base.next) {
5656                 assert(s->kind == STATEMENT_ASM);
5657
5658                 char const *const text = s->asms.asm_text.begin;
5659                 size_t      const size = s->asms.asm_text.size;
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 }