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->encoding) {
1298         case STRING_ENCODING_WIDE: {
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 STRING_ENCODING_CHAR: {
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:          return char_literal_to_firm(            &expr->string_literal);
3352         case EXPR_OFFSETOF:                   return offsetof_to_firm(                &expr->offsetofe);
3353         case EXPR_REFERENCE:                  return reference_expression_to_firm(    &expr->reference);
3354         case EXPR_ENUM_CONSTANT:              return enum_constant_to_firm(           &expr->reference);
3355         case EXPR_SELECT:                     return select_to_firm(                  &expr->select);
3356         case EXPR_SIZEOF:                     return sizeof_to_firm(                  &expr->typeprop);
3357         case EXPR_STATEMENT:                  return statement_expression_to_firm(    &expr->statement);
3358         case EXPR_UNARY_CASES:                return unary_expression_to_firm(        &expr->unary);
3359         case EXPR_VA_ARG:                     return va_arg_expression_to_firm(       &expr->va_arge);
3360         case EXPR_VA_COPY:                    return va_copy_expression_to_firm(      &expr->va_copye);
3361         case EXPR_VA_START:                   return va_start_expression_to_firm(     &expr->va_starte);
3362
3363         case EXPR_STRING_LITERAL: return string_to_firm(&expr->base.source_position, "str.%u", expr->string_literal.encoding, &expr->string_literal.value);
3364
3365         case EXPR_ERROR: break;
3366         }
3367         panic("invalid expression found");
3368 }
3369
3370 /**
3371  * Check if a given expression is a GNU __builtin_expect() call.
3372  */
3373 static bool is_builtin_expect(const expression_t *expression)
3374 {
3375         if (expression->kind != EXPR_CALL)
3376                 return false;
3377
3378         expression_t *function = expression->call.function;
3379         if (function->kind != EXPR_REFERENCE)
3380                 return false;
3381         reference_expression_t *ref = &function->reference;
3382         if (ref->entity->kind         != ENTITY_FUNCTION ||
3383             ref->entity->function.btk != BUILTIN_EXPECT)
3384                 return false;
3385
3386         return true;
3387 }
3388
3389 static bool produces_mode_b(const expression_t *expression)
3390 {
3391         switch (expression->kind) {
3392         case EXPR_BINARY_EQUAL:
3393         case EXPR_BINARY_NOTEQUAL:
3394         case EXPR_BINARY_LESS:
3395         case EXPR_BINARY_LESSEQUAL:
3396         case EXPR_BINARY_GREATER:
3397         case EXPR_BINARY_GREATEREQUAL:
3398         case EXPR_BINARY_ISGREATER:
3399         case EXPR_BINARY_ISGREATEREQUAL:
3400         case EXPR_BINARY_ISLESS:
3401         case EXPR_BINARY_ISLESSEQUAL:
3402         case EXPR_BINARY_ISLESSGREATER:
3403         case EXPR_BINARY_ISUNORDERED:
3404         case EXPR_UNARY_NOT:
3405                 return true;
3406
3407         case EXPR_CALL:
3408                 if (is_builtin_expect(expression)) {
3409                         expression_t *argument = expression->call.arguments->expression;
3410                         return produces_mode_b(argument);
3411                 }
3412                 return false;
3413         case EXPR_BINARY_COMMA:
3414                 return produces_mode_b(expression->binary.right);
3415
3416         default:
3417                 return false;
3418         }
3419 }
3420
3421 static ir_node *expression_to_firm(const expression_t *expression)
3422 {
3423         if (!produces_mode_b(expression)) {
3424                 ir_node *res = _expression_to_firm(expression);
3425                 assert(res == NULL || get_irn_mode(res) != mode_b);
3426                 return res;
3427         }
3428
3429         if (is_constant_expression(expression) == EXPR_CLASS_CONSTANT) {
3430                 return new_Const(fold_constant_to_tarval(expression));
3431         }
3432
3433         /* we have to produce a 0/1 from the mode_b expression */
3434         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3435         ir_mode  *mode = get_ir_mode_arithmetic(expression->base.type);
3436         return produce_condition_result(expression, mode, dbgi);
3437 }
3438
3439 /**
3440  * create a short-circuit expression evaluation that tries to construct
3441  * efficient control flow structures for &&, || and ! expressions
3442  */
3443 static ir_node *create_condition_evaluation(const expression_t *expression,
3444                                             ir_node *true_block,
3445                                             ir_node *false_block)
3446 {
3447         switch(expression->kind) {
3448         case EXPR_UNARY_NOT: {
3449                 const unary_expression_t *unary_expression = &expression->unary;
3450                 create_condition_evaluation(unary_expression->value, false_block,
3451                                             true_block);
3452                 return NULL;
3453         }
3454         case EXPR_BINARY_LOGICAL_AND: {
3455                 const binary_expression_t *binary_expression = &expression->binary;
3456
3457                 ir_node *extra_block = new_immBlock();
3458                 create_condition_evaluation(binary_expression->left, extra_block,
3459                                             false_block);
3460                 mature_immBlock(extra_block);
3461                 set_cur_block(extra_block);
3462                 create_condition_evaluation(binary_expression->right, true_block,
3463                                             false_block);
3464                 return NULL;
3465         }
3466         case EXPR_BINARY_LOGICAL_OR: {
3467                 const binary_expression_t *binary_expression = &expression->binary;
3468
3469                 ir_node *extra_block = new_immBlock();
3470                 create_condition_evaluation(binary_expression->left, true_block,
3471                                             extra_block);
3472                 mature_immBlock(extra_block);
3473                 set_cur_block(extra_block);
3474                 create_condition_evaluation(binary_expression->right, true_block,
3475                                             false_block);
3476                 return NULL;
3477         }
3478         default:
3479                 break;
3480         }
3481
3482         dbg_info *dbgi       = get_dbg_info(&expression->base.source_position);
3483         ir_node  *cond_expr  = _expression_to_firm(expression);
3484         ir_node  *condition  = create_conv(dbgi, cond_expr, mode_b);
3485         ir_node  *cond       = new_d_Cond(dbgi, condition);
3486         ir_node  *true_proj  = new_d_Proj(dbgi, cond, mode_X, pn_Cond_true);
3487         ir_node  *false_proj = new_d_Proj(dbgi, cond, mode_X, pn_Cond_false);
3488
3489         /* set branch prediction info based on __builtin_expect */
3490         if (is_builtin_expect(expression) && is_Cond(cond)) {
3491                 call_argument_t *argument = expression->call.arguments->next;
3492                 if (is_constant_expression(argument->expression) == EXPR_CLASS_CONSTANT) {
3493                         bool               const cnst = fold_constant_to_bool(argument->expression);
3494                         cond_jmp_predicate const pred = cnst ? COND_JMP_PRED_TRUE : COND_JMP_PRED_FALSE;
3495                         set_Cond_jmp_pred(cond, pred);
3496                 }
3497         }
3498
3499         add_immBlock_pred(true_block, true_proj);
3500         add_immBlock_pred(false_block, false_proj);
3501
3502         set_unreachable_now();
3503         return cond_expr;
3504 }
3505
3506 static void create_variable_entity(entity_t *variable,
3507                                    declaration_kind_t declaration_kind,
3508                                    ir_type *parent_type)
3509 {
3510         assert(variable->kind == ENTITY_VARIABLE);
3511         type_t    *type = skip_typeref(variable->declaration.type);
3512
3513         ident     *const id        = new_id_from_str(variable->base.symbol->string);
3514         ir_type   *const irtype    = get_ir_type(type);
3515         dbg_info  *const dbgi      = get_dbg_info(&variable->base.source_position);
3516         ir_entity *const irentity  = new_d_entity(parent_type, id, irtype, dbgi);
3517         unsigned         alignment = variable->declaration.alignment;
3518
3519         set_entity_alignment(irentity, alignment);
3520
3521         handle_decl_modifiers(irentity, variable);
3522
3523         variable->declaration.kind  = (unsigned char) declaration_kind;
3524         variable->variable.v.entity = irentity;
3525         set_entity_ld_ident(irentity, create_ld_ident(variable));
3526
3527         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
3528                 set_entity_volatility(irentity, volatility_is_volatile);
3529         }
3530 }
3531
3532
3533 typedef struct type_path_entry_t type_path_entry_t;
3534 struct type_path_entry_t {
3535         type_t           *type;
3536         ir_initializer_t *initializer;
3537         size_t            index;
3538         entity_t         *compound_entry;
3539 };
3540
3541 typedef struct type_path_t type_path_t;
3542 struct type_path_t {
3543         type_path_entry_t *path;
3544         type_t            *top_type;
3545         bool               invalid;
3546 };
3547
3548 static __attribute__((unused)) void debug_print_type_path(const type_path_t *path)
3549 {
3550         size_t len = ARR_LEN(path->path);
3551
3552         for (size_t i = 0; i < len; ++i) {
3553                 const type_path_entry_t *entry = & path->path[i];
3554
3555                 type_t *type = skip_typeref(entry->type);
3556                 if (is_type_compound(type)) {
3557                         fprintf(stderr, ".%s", entry->compound_entry->base.symbol->string);
3558                 } else if (is_type_array(type)) {
3559                         fprintf(stderr, "[%u]", (unsigned) entry->index);
3560                 } else {
3561                         fprintf(stderr, "-INVALID-");
3562                 }
3563         }
3564         fprintf(stderr, "  (");
3565         print_type(path->top_type);
3566         fprintf(stderr, ")");
3567 }
3568
3569 static type_path_entry_t *get_type_path_top(const type_path_t *path)
3570 {
3571         size_t len = ARR_LEN(path->path);
3572         assert(len > 0);
3573         return & path->path[len-1];
3574 }
3575
3576 static type_path_entry_t *append_to_type_path(type_path_t *path)
3577 {
3578         size_t len = ARR_LEN(path->path);
3579         ARR_RESIZE(type_path_entry_t, path->path, len+1);
3580
3581         type_path_entry_t *result = & path->path[len];
3582         memset(result, 0, sizeof(result[0]));
3583         return result;
3584 }
3585
3586 static size_t get_compound_member_count(const compound_type_t *type)
3587 {
3588         compound_t *compound  = type->compound;
3589         size_t      n_members = 0;
3590         entity_t   *member    = compound->members.entities;
3591         for ( ; member != NULL; member = member->base.next) {
3592                 ++n_members;
3593         }
3594
3595         return n_members;
3596 }
3597
3598 static ir_initializer_t *get_initializer_entry(type_path_t *path)
3599 {
3600         type_t *orig_top_type = path->top_type;
3601         type_t *top_type      = skip_typeref(orig_top_type);
3602
3603         assert(is_type_compound(top_type) || is_type_array(top_type));
3604
3605         if (ARR_LEN(path->path) == 0) {
3606                 return NULL;
3607         } else {
3608                 type_path_entry_t *top         = get_type_path_top(path);
3609                 ir_initializer_t  *initializer = top->initializer;
3610                 return get_initializer_compound_value(initializer, top->index);
3611         }
3612 }
3613
3614 static void descend_into_subtype(type_path_t *path)
3615 {
3616         type_t *orig_top_type = path->top_type;
3617         type_t *top_type      = skip_typeref(orig_top_type);
3618
3619         assert(is_type_compound(top_type) || is_type_array(top_type));
3620
3621         ir_initializer_t *initializer = get_initializer_entry(path);
3622
3623         type_path_entry_t *top = append_to_type_path(path);
3624         top->type              = top_type;
3625
3626         size_t len;
3627
3628         if (is_type_compound(top_type)) {
3629                 compound_t *const compound = top_type->compound.compound;
3630                 entity_t   *const entry    = skip_unnamed_bitfields(compound->members.entities);
3631
3632                 top->compound_entry = entry;
3633                 top->index          = 0;
3634                 len                 = get_compound_member_count(&top_type->compound);
3635                 if (entry != NULL) {
3636                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3637                         path->top_type = entry->declaration.type;
3638                 }
3639         } else {
3640                 assert(is_type_array(top_type));
3641                 assert(top_type->array.size > 0);
3642
3643                 top->index     = 0;
3644                 path->top_type = top_type->array.element_type;
3645                 len            = top_type->array.size;
3646         }
3647         if (initializer == NULL
3648                         || get_initializer_kind(initializer) == IR_INITIALIZER_NULL) {
3649                 initializer = create_initializer_compound(len);
3650                 /* we have to set the entry at the 2nd latest path entry... */
3651                 size_t path_len = ARR_LEN(path->path);
3652                 assert(path_len >= 1);
3653                 if (path_len > 1) {
3654                         type_path_entry_t *entry        = & path->path[path_len-2];
3655                         ir_initializer_t  *tinitializer = entry->initializer;
3656                         set_initializer_compound_value(tinitializer, entry->index,
3657                                                        initializer);
3658                 }
3659         }
3660         top->initializer = initializer;
3661 }
3662
3663 static void ascend_from_subtype(type_path_t *path)
3664 {
3665         type_path_entry_t *top = get_type_path_top(path);
3666
3667         path->top_type = top->type;
3668
3669         size_t len = ARR_LEN(path->path);
3670         ARR_RESIZE(type_path_entry_t, path->path, len-1);
3671 }
3672
3673 static void walk_designator(type_path_t *path, const designator_t *designator)
3674 {
3675         /* designators start at current object type */
3676         ARR_RESIZE(type_path_entry_t, path->path, 1);
3677
3678         for ( ; designator != NULL; designator = designator->next) {
3679                 type_path_entry_t *top         = get_type_path_top(path);
3680                 type_t            *orig_type   = top->type;
3681                 type_t            *type        = skip_typeref(orig_type);
3682
3683                 if (designator->symbol != NULL) {
3684                         assert(is_type_compound(type));
3685                         size_t    index  = 0;
3686                         symbol_t *symbol = designator->symbol;
3687
3688                         compound_t *compound = type->compound.compound;
3689                         entity_t   *iter     = compound->members.entities;
3690                         for ( ; iter != NULL; iter = iter->base.next, ++index) {
3691                                 if (iter->base.symbol == symbol) {
3692                                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
3693                                         break;
3694                                 }
3695                         }
3696                         assert(iter != NULL);
3697
3698                         /* revert previous initialisations of other union elements */
3699                         if (type->kind == TYPE_COMPOUND_UNION) {
3700                                 ir_initializer_t *initializer = top->initializer;
3701                                 if (initializer != NULL
3702                                         && get_initializer_kind(initializer) == IR_INITIALIZER_COMPOUND) {
3703                                         /* are we writing to a new element? */
3704                                         ir_initializer_t *oldi
3705                                                 = get_initializer_compound_value(initializer, index);
3706                                         if (get_initializer_kind(oldi) == IR_INITIALIZER_NULL) {
3707                                                 /* clear initializer */
3708                                                 size_t len
3709                                                         = get_initializer_compound_n_entries(initializer);
3710                                                 ir_initializer_t *nulli = get_initializer_null();
3711                                                 for (size_t i = 0; i < len; ++i) {
3712                                                         set_initializer_compound_value(initializer, i,
3713                                                                                        nulli);
3714                                                 }
3715                                         }
3716                                 }
3717                         }
3718
3719                         top->type           = orig_type;
3720                         top->compound_entry = iter;
3721                         top->index          = index;
3722                         orig_type           = iter->declaration.type;
3723                 } else {
3724                         expression_t *array_index = designator->array_index;
3725                         assert(designator->array_index != NULL);
3726                         assert(is_type_array(type));
3727
3728                         long index = fold_constant_to_int(array_index);
3729                         assert(index >= 0);
3730 #ifndef NDEBUG
3731                         if (type->array.size_constant) {
3732                                 long array_size = type->array.size;
3733                                 assert(index < array_size);
3734                         }
3735 #endif
3736
3737                         top->type  = orig_type;
3738                         top->index = (size_t) index;
3739                         orig_type  = type->array.element_type;
3740                 }
3741                 path->top_type = orig_type;
3742
3743                 if (designator->next != NULL) {
3744                         descend_into_subtype(path);
3745                 }
3746         }
3747
3748         path->invalid  = false;
3749 }
3750
3751 static void advance_current_object(type_path_t *path)
3752 {
3753         if (path->invalid) {
3754                 /* TODO: handle this... */
3755                 panic("invalid initializer in ast2firm (excessive elements)");
3756         }
3757
3758         type_path_entry_t *top = get_type_path_top(path);
3759
3760         type_t *type = skip_typeref(top->type);
3761         if (is_type_union(type)) {
3762                 /* only the first element is initialized in unions */
3763                 top->compound_entry = NULL;
3764         } else if (is_type_struct(type)) {
3765                 entity_t *entry = top->compound_entry;
3766
3767                 top->index++;
3768                 entry               = skip_unnamed_bitfields(entry->base.next);
3769                 top->compound_entry = entry;
3770                 if (entry != NULL) {
3771                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3772                         path->top_type = entry->declaration.type;
3773                         return;
3774                 }
3775         } else {
3776                 assert(is_type_array(type));
3777
3778                 top->index++;
3779                 if (!type->array.size_constant || top->index < type->array.size) {
3780                         return;
3781                 }
3782         }
3783
3784         /* we're past the last member of the current sub-aggregate, try if we
3785          * can ascend in the type hierarchy and continue with another subobject */
3786         size_t len = ARR_LEN(path->path);
3787
3788         if (len > 1) {
3789                 ascend_from_subtype(path);
3790                 advance_current_object(path);
3791         } else {
3792                 path->invalid = true;
3793         }
3794 }
3795
3796
3797 static ir_initializer_t *create_ir_initializer_value(
3798                 const initializer_value_t *initializer)
3799 {
3800         if (is_type_compound(initializer->value->base.type)) {
3801                 panic("initializer creation for compounds not implemented yet");
3802         }
3803         type_t       *type = initializer->value->base.type;
3804         expression_t *expr = initializer->value;
3805         ir_node *value = expression_to_firm(expr);
3806         ir_mode *mode  = get_ir_mode_storage(type);
3807         value          = create_conv(NULL, value, mode);
3808         return create_initializer_const(value);
3809 }
3810
3811 /** test wether type can be initialized by a string constant */
3812 static bool is_string_type(type_t *type)
3813 {
3814         type_t *inner;
3815         if (is_type_pointer(type)) {
3816                 inner = skip_typeref(type->pointer.points_to);
3817         } else if(is_type_array(type)) {
3818                 inner = skip_typeref(type->array.element_type);
3819         } else {
3820                 return false;
3821         }
3822
3823         return is_type_integer(inner);
3824 }
3825
3826 static ir_initializer_t *create_ir_initializer_list(
3827                 const initializer_list_t *initializer, type_t *type)
3828 {
3829         type_path_t path;
3830         memset(&path, 0, sizeof(path));
3831         path.top_type = type;
3832         path.path     = NEW_ARR_F(type_path_entry_t, 0);
3833
3834         descend_into_subtype(&path);
3835
3836         for (size_t i = 0; i < initializer->len; ++i) {
3837                 const initializer_t *sub_initializer = initializer->initializers[i];
3838
3839                 if (sub_initializer->kind == INITIALIZER_DESIGNATOR) {
3840                         walk_designator(&path, sub_initializer->designator.designator);
3841                         continue;
3842                 }
3843
3844                 if (sub_initializer->kind == INITIALIZER_VALUE) {
3845                         /* we might have to descend into types until we're at a scalar
3846                          * type */
3847                         while(true) {
3848                                 type_t *orig_top_type = path.top_type;
3849                                 type_t *top_type      = skip_typeref(orig_top_type);
3850
3851                                 if (is_type_scalar(top_type))
3852                                         break;
3853                                 descend_into_subtype(&path);
3854                         }
3855                 } else if (sub_initializer->kind == INITIALIZER_STRING
3856                                 || sub_initializer->kind == INITIALIZER_WIDE_STRING) {
3857                         /* we might have to descend into types until we're at a scalar
3858                          * type */
3859                         while (true) {
3860                                 type_t *orig_top_type = path.top_type;
3861                                 type_t *top_type      = skip_typeref(orig_top_type);
3862
3863                                 if (is_string_type(top_type))
3864                                         break;
3865                                 descend_into_subtype(&path);
3866                         }
3867                 }
3868
3869                 ir_initializer_t *sub_irinitializer
3870                         = create_ir_initializer(sub_initializer, path.top_type);
3871
3872                 size_t path_len = ARR_LEN(path.path);
3873                 assert(path_len >= 1);
3874                 type_path_entry_t *entry        = & path.path[path_len-1];
3875                 ir_initializer_t  *tinitializer = entry->initializer;
3876                 set_initializer_compound_value(tinitializer, entry->index,
3877                                                sub_irinitializer);
3878
3879                 advance_current_object(&path);
3880         }
3881
3882         assert(ARR_LEN(path.path) >= 1);
3883         ir_initializer_t *result = path.path[0].initializer;
3884         DEL_ARR_F(path.path);
3885
3886         return result;
3887 }
3888
3889 static ir_initializer_t *create_ir_initializer_string(
3890                 const initializer_string_t *initializer, type_t *type)
3891 {
3892         type = skip_typeref(type);
3893
3894         size_t            string_len    = initializer->string.size;
3895         assert(type->kind == TYPE_ARRAY);
3896         assert(type->array.size_constant);
3897         size_t            len           = type->array.size;
3898         ir_initializer_t *irinitializer = create_initializer_compound(len);
3899
3900         const char *string = initializer->string.begin;
3901         ir_mode    *mode   = get_ir_mode_storage(type->array.element_type);
3902
3903         for (size_t i = 0; i < len; ++i) {
3904                 char c = 0;
3905                 if (i < string_len)
3906                         c = string[i];
3907
3908                 ir_tarval        *tv = new_tarval_from_long(c, mode);
3909                 ir_initializer_t *char_initializer = create_initializer_tarval(tv);
3910
3911                 set_initializer_compound_value(irinitializer, i, char_initializer);
3912         }
3913
3914         return irinitializer;
3915 }
3916
3917 static ir_initializer_t *create_ir_initializer_wide_string(
3918                 const initializer_wide_string_t *initializer, type_t *type)
3919 {
3920         assert(type->kind == TYPE_ARRAY);
3921         assert(type->array.size_constant);
3922         size_t            len           = type->array.size;
3923         size_t            string_len    = wstrlen(&initializer->string);
3924         ir_initializer_t *irinitializer = create_initializer_compound(len);
3925
3926         const char *p    = initializer->string.begin;
3927         ir_mode    *mode = get_type_mode(ir_type_wchar_t);
3928
3929         for (size_t i = 0; i < len; ++i) {
3930                 utf32 c = 0;
3931                 if (i < string_len) {
3932                         c = read_utf8_char(&p);
3933                 }
3934                 ir_tarval *tv = new_tarval_from_long(c, mode);
3935                 ir_initializer_t *char_initializer = create_initializer_tarval(tv);
3936
3937                 set_initializer_compound_value(irinitializer, i, char_initializer);
3938         }
3939
3940         return irinitializer;
3941 }
3942
3943 static ir_initializer_t *create_ir_initializer(
3944                 const initializer_t *initializer, type_t *type)
3945 {
3946         switch(initializer->kind) {
3947                 case INITIALIZER_STRING:
3948                         return create_ir_initializer_string(&initializer->string, type);
3949
3950                 case INITIALIZER_WIDE_STRING:
3951                         return create_ir_initializer_wide_string(&initializer->wide_string,
3952                                                                  type);
3953
3954                 case INITIALIZER_LIST:
3955                         return create_ir_initializer_list(&initializer->list, type);
3956
3957                 case INITIALIZER_VALUE:
3958                         return create_ir_initializer_value(&initializer->value);
3959
3960                 case INITIALIZER_DESIGNATOR:
3961                         panic("unexpected designator initializer found");
3962         }
3963         panic("unknown initializer");
3964 }
3965
3966 /** ANSI C §6.7.8:21: If there are fewer initializers [..] than there
3967  *  are elements [...] the remainder of the aggregate shall be initialized
3968  *  implicitly the same as objects that have static storage duration. */
3969 static void create_dynamic_null_initializer(ir_entity *entity, dbg_info *dbgi,
3970                 ir_node *base_addr)
3971 {
3972         /* for unions we must NOT do anything for null initializers */
3973         ir_type *owner = get_entity_owner(entity);
3974         if (is_Union_type(owner)) {
3975                 return;
3976         }
3977
3978         ir_type *ent_type = get_entity_type(entity);
3979         /* create sub-initializers for a compound type */
3980         if (is_compound_type(ent_type)) {
3981                 unsigned n_members = get_compound_n_members(ent_type);
3982                 for (unsigned n = 0; n < n_members; ++n) {
3983                         ir_entity *member = get_compound_member(ent_type, n);
3984                         ir_node   *addr   = new_d_simpleSel(dbgi, new_NoMem(), base_addr,
3985                                                                 member);
3986                         create_dynamic_null_initializer(member, dbgi, addr);
3987                 }
3988                 return;
3989         }
3990         if (is_Array_type(ent_type)) {
3991                 assert(has_array_upper_bound(ent_type, 0));
3992                 long n = get_array_upper_bound_int(ent_type, 0);
3993                 for (long i = 0; i < n; ++i) {
3994                         ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
3995                         ir_tarval *index_tv = new_tarval_from_long(i, mode_uint);
3996                         ir_node   *cnst     = new_d_Const(dbgi, index_tv);
3997                         ir_node   *in[1]    = { cnst };
3998                         ir_entity *arrent   = get_array_element_entity(ent_type);
3999                         ir_node   *addr     = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in,
4000                                                         arrent);
4001                         create_dynamic_null_initializer(arrent, dbgi, addr);
4002                 }
4003                 return;
4004         }
4005
4006         ir_mode *value_mode = get_type_mode(ent_type);
4007         ir_node *node       = new_Const(get_mode_null(value_mode));
4008
4009         /* is it a bitfield type? */
4010         if (is_Primitive_type(ent_type) &&
4011                         get_primitive_base_type(ent_type) != NULL) {
4012                 bitfield_store_to_firm(dbgi, entity, base_addr, node, false, false);
4013                 return;
4014         }
4015
4016         ir_node *mem    = get_store();
4017         ir_node *store  = new_d_Store(dbgi, mem, base_addr, node, cons_none);
4018         ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4019         set_store(proj_m);
4020 }
4021
4022 static void create_dynamic_initializer_sub(ir_initializer_t *initializer,
4023                 ir_entity *entity, ir_type *type, dbg_info *dbgi, ir_node *base_addr)
4024 {
4025         switch(get_initializer_kind(initializer)) {
4026         case IR_INITIALIZER_NULL:
4027                 create_dynamic_null_initializer(entity, dbgi, base_addr);
4028                 return;
4029         case IR_INITIALIZER_CONST: {
4030                 ir_node *node     = get_initializer_const_value(initializer);
4031                 ir_type *ent_type = get_entity_type(entity);
4032
4033                 /* is it a bitfield type? */
4034                 if (is_Primitive_type(ent_type) &&
4035                                 get_primitive_base_type(ent_type) != NULL) {
4036                         bitfield_store_to_firm(dbgi, entity, base_addr, node, false, false);
4037                         return;
4038                 }
4039
4040                 assert(get_type_mode(type) == get_irn_mode(node));
4041                 ir_node *mem    = get_store();
4042                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, node, cons_none);
4043                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4044                 set_store(proj_m);
4045                 return;
4046         }
4047         case IR_INITIALIZER_TARVAL: {
4048                 ir_tarval *tv       = get_initializer_tarval_value(initializer);
4049                 ir_node   *cnst     = new_d_Const(dbgi, tv);
4050                 ir_type   *ent_type = get_entity_type(entity);
4051
4052                 /* is it a bitfield type? */
4053                 if (is_Primitive_type(ent_type) &&
4054                                 get_primitive_base_type(ent_type) != NULL) {
4055                         bitfield_store_to_firm(dbgi, entity, base_addr, cnst, false, false);
4056                         return;
4057                 }
4058
4059                 assert(get_type_mode(type) == get_tarval_mode(tv));
4060                 ir_node *mem    = get_store();
4061                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, cnst, cons_none);
4062                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4063                 set_store(proj_m);
4064                 return;
4065         }
4066         case IR_INITIALIZER_COMPOUND: {
4067                 assert(is_compound_type(type) || is_Array_type(type));
4068                 int n_members;
4069                 if (is_Array_type(type)) {
4070                         assert(has_array_upper_bound(type, 0));
4071                         n_members = get_array_upper_bound_int(type, 0);
4072                 } else {
4073                         n_members = get_compound_n_members(type);
4074                 }
4075
4076                 if (get_initializer_compound_n_entries(initializer)
4077                                 != (unsigned) n_members)
4078                         panic("initializer doesn't match compound type");
4079
4080                 for (int i = 0; i < n_members; ++i) {
4081                         ir_node   *addr;
4082                         ir_type   *irtype;
4083                         ir_entity *sub_entity;
4084                         if (is_Array_type(type)) {
4085                                 ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
4086                                 ir_tarval *index_tv = new_tarval_from_long(i, mode_uint);
4087                                 ir_node   *cnst     = new_d_Const(dbgi, index_tv);
4088                                 ir_node   *in[1]    = { cnst };
4089                                 irtype     = get_array_element_type(type);
4090                                 sub_entity = get_array_element_entity(type);
4091                                 addr       = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in,
4092                                                        sub_entity);
4093                         } else {
4094                                 sub_entity = get_compound_member(type, i);
4095                                 irtype     = get_entity_type(sub_entity);
4096                                 addr       = new_d_simpleSel(dbgi, new_NoMem(), base_addr,
4097                                                              sub_entity);
4098                         }
4099
4100                         ir_initializer_t *sub_init
4101                                 = get_initializer_compound_value(initializer, i);
4102
4103                         create_dynamic_initializer_sub(sub_init, sub_entity, irtype, dbgi,
4104                                                        addr);
4105                 }
4106                 return;
4107         }
4108         }
4109
4110         panic("invalid IR_INITIALIZER found");
4111 }
4112
4113 static void create_dynamic_initializer(ir_initializer_t *initializer,
4114                 dbg_info *dbgi, ir_entity *entity)
4115 {
4116         ir_node *frame     = get_irg_frame(current_ir_graph);
4117         ir_node *base_addr = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
4118         ir_type *type      = get_entity_type(entity);
4119
4120         create_dynamic_initializer_sub(initializer, entity, type, dbgi, base_addr);
4121 }
4122
4123 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
4124                                      ir_entity *entity, type_t *type)
4125 {
4126         ir_node *memory = get_store();
4127         ir_node *nomem  = new_NoMem();
4128         ir_node *frame  = get_irg_frame(current_ir_graph);
4129         ir_node *addr   = new_d_simpleSel(dbgi, nomem, frame, entity);
4130
4131         if (initializer->kind == INITIALIZER_VALUE) {
4132                 initializer_value_t *initializer_value = &initializer->value;
4133
4134                 ir_node *value = expression_to_firm(initializer_value->value);
4135                 type = skip_typeref(type);
4136                 assign_value(dbgi, addr, type, value);
4137                 return;
4138         }
4139
4140         if (is_constant_initializer(initializer) == EXPR_CLASS_VARIABLE) {
4141                 ir_initializer_t *irinitializer
4142                         = create_ir_initializer(initializer, type);
4143
4144                 create_dynamic_initializer(irinitializer, dbgi, entity);
4145                 return;
4146         }
4147
4148         /* create a "template" entity which is copied to the entity on the stack */
4149         ir_entity *const init_entity
4150                 = create_initializer_entity(dbgi, initializer, type);
4151         ir_node *const src_addr = create_symconst(dbgi, init_entity);
4152         ir_type *const irtype   = get_ir_type(type);
4153         ir_node *const copyb    = new_d_CopyB(dbgi, memory, addr, src_addr, irtype);
4154
4155         ir_node *const copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
4156         set_store(copyb_mem);
4157 }
4158
4159 static void create_initializer_local_variable_entity(entity_t *entity)
4160 {
4161         assert(entity->kind == ENTITY_VARIABLE);
4162         initializer_t *initializer = entity->variable.initializer;
4163         dbg_info      *dbgi        = get_dbg_info(&entity->base.source_position);
4164         ir_entity     *irentity    = entity->variable.v.entity;
4165         type_t        *type        = entity->declaration.type;
4166
4167         create_local_initializer(initializer, dbgi, irentity, type);
4168 }
4169
4170 static void create_variable_initializer(entity_t *entity)
4171 {
4172         assert(entity->kind == ENTITY_VARIABLE);
4173         initializer_t *initializer = entity->variable.initializer;
4174         if (initializer == NULL)
4175                 return;
4176
4177         declaration_kind_t declaration_kind
4178                 = (declaration_kind_t) entity->declaration.kind;
4179         if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY) {
4180                 create_initializer_local_variable_entity(entity);
4181                 return;
4182         }
4183
4184         type_t            *type = entity->declaration.type;
4185         type_qualifiers_t  tq   = get_type_qualifier(type, true);
4186
4187         if (initializer->kind == INITIALIZER_VALUE) {
4188                 expression_t *      value     = initializer->value.value;
4189                 type_t       *const init_type = skip_typeref(value->base.type);
4190
4191                 if (!is_type_scalar(init_type)) {
4192                         /* skip convs */
4193                         while (value->kind == EXPR_UNARY_CAST)
4194                                 value = value->unary.value;
4195
4196                         if (value->kind != EXPR_COMPOUND_LITERAL)
4197                                 panic("expected non-scalar initializer to be a compound literal");
4198                         initializer = value->compound_literal.initializer;
4199                         goto have_initializer;
4200                 }
4201
4202                 ir_node  *      node = expression_to_firm(value);
4203                 dbg_info *const dbgi = get_dbg_info(&entity->base.source_position);
4204                 ir_mode  *const mode = get_ir_mode_storage(init_type);
4205                 node = create_conv(dbgi, node, mode);
4206                 node = do_strict_conv(dbgi, node);
4207
4208                 if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE) {
4209                         set_value(entity->variable.v.value_number, node);
4210                 } else {
4211                         assert(declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4212
4213                         ir_entity *irentity = entity->variable.v.entity;
4214
4215                         if (tq & TYPE_QUALIFIER_CONST
4216                                         && get_entity_owner(irentity) != get_tls_type()) {
4217                                 add_entity_linkage(irentity, IR_LINKAGE_CONSTANT);
4218                         }
4219                         set_atomic_ent_value(irentity, node);
4220                 }
4221         } else {
4222 have_initializer:
4223                 assert(declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY ||
4224                        declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4225
4226                 ir_entity        *irentity        = entity->variable.v.entity;
4227                 ir_initializer_t *irinitializer
4228                         = create_ir_initializer(initializer, type);
4229
4230                 if (tq & TYPE_QUALIFIER_CONST) {
4231                         add_entity_linkage(irentity, IR_LINKAGE_CONSTANT);
4232                 }
4233                 set_entity_initializer(irentity, irinitializer);
4234         }
4235 }
4236
4237 static void create_variable_length_array(entity_t *entity)
4238 {
4239         assert(entity->kind == ENTITY_VARIABLE);
4240         assert(entity->variable.initializer == NULL);
4241
4242         entity->declaration.kind    = DECLARATION_KIND_VARIABLE_LENGTH_ARRAY;
4243         entity->variable.v.vla_base = NULL;
4244
4245         /* TODO: record VLA somewhere so we create the free node when we leave
4246          * it's scope */
4247 }
4248
4249 static void allocate_variable_length_array(entity_t *entity)
4250 {
4251         assert(entity->kind == ENTITY_VARIABLE);
4252         assert(entity->variable.initializer == NULL);
4253         assert(currently_reachable());
4254
4255         dbg_info *dbgi      = get_dbg_info(&entity->base.source_position);
4256         type_t   *type      = entity->declaration.type;
4257         ir_type  *el_type   = get_ir_type(type->array.element_type);
4258
4259         /* make sure size_node is calculated */
4260         get_type_size_node(type);
4261         ir_node  *elems = type->array.size_node;
4262         ir_node  *mem   = get_store();
4263         ir_node  *alloc = new_d_Alloc(dbgi, mem, elems, el_type, stack_alloc);
4264
4265         ir_node  *proj_m = new_d_Proj(dbgi, alloc, mode_M, pn_Alloc_M);
4266         ir_node  *addr   = new_d_Proj(dbgi, alloc, mode_P_data, pn_Alloc_res);
4267         set_store(proj_m);
4268
4269         assert(entity->declaration.kind == DECLARATION_KIND_VARIABLE_LENGTH_ARRAY);
4270         entity->variable.v.vla_base = addr;
4271 }
4272
4273 /**
4274  * Creates a Firm local variable from a declaration.
4275  */
4276 static void create_local_variable(entity_t *entity)
4277 {
4278         assert(entity->kind == ENTITY_VARIABLE);
4279         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4280
4281         bool needs_entity = entity->variable.address_taken;
4282         type_t *type = skip_typeref(entity->declaration.type);
4283
4284         /* is it a variable length array? */
4285         if (is_type_array(type) && !type->array.size_constant) {
4286                 create_variable_length_array(entity);
4287                 return;
4288         } else if (is_type_array(type) || is_type_compound(type)) {
4289                 needs_entity = true;
4290         } else if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
4291                 needs_entity = true;
4292         }
4293
4294         if (needs_entity) {
4295                 ir_type *frame_type = get_irg_frame_type(current_ir_graph);
4296                 create_variable_entity(entity,
4297                                        DECLARATION_KIND_LOCAL_VARIABLE_ENTITY,
4298                                        frame_type);
4299         } else {
4300                 entity->declaration.kind        = DECLARATION_KIND_LOCAL_VARIABLE;
4301                 entity->variable.v.value_number = next_value_number_function;
4302                 set_irg_loc_description(current_ir_graph, next_value_number_function,
4303                                         entity);
4304                 ++next_value_number_function;
4305         }
4306 }
4307
4308 static void create_local_static_variable(entity_t *entity)
4309 {
4310         assert(entity->kind == ENTITY_VARIABLE);
4311         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4312
4313         type_t   *type           = skip_typeref(entity->declaration.type);
4314         ir_type  *const var_type = entity->variable.thread_local ?
4315                 get_tls_type() : get_glob_type();
4316         ir_type  *const irtype   = get_ir_type(type);
4317         dbg_info *const dbgi     = get_dbg_info(&entity->base.source_position);
4318
4319         size_t l = strlen(entity->base.symbol->string);
4320         char   buf[l + sizeof(".%u")];
4321         snprintf(buf, sizeof(buf), "%s.%%u", entity->base.symbol->string);
4322         ident     *const id       = id_unique(buf);
4323         ir_entity *const irentity = new_d_entity(var_type, id, irtype, dbgi);
4324
4325         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
4326                 set_entity_volatility(irentity, volatility_is_volatile);
4327         }
4328
4329         entity->declaration.kind  = DECLARATION_KIND_GLOBAL_VARIABLE;
4330         entity->variable.v.entity = irentity;
4331
4332         set_entity_ld_ident(irentity, id);
4333         set_entity_visibility(irentity, ir_visibility_local);
4334
4335         if (entity->variable.initializer == NULL) {
4336                 ir_initializer_t *null_init = get_initializer_null();
4337                 set_entity_initializer(irentity, null_init);
4338         }
4339
4340         ir_graph *const old_current_ir_graph = current_ir_graph;
4341         current_ir_graph = get_const_code_irg();
4342
4343         create_variable_initializer(entity);
4344
4345         assert(current_ir_graph == get_const_code_irg());
4346         current_ir_graph = old_current_ir_graph;
4347 }
4348
4349
4350
4351 static ir_node *return_statement_to_firm(return_statement_t *statement)
4352 {
4353         if (!currently_reachable())
4354                 return NULL;
4355
4356         dbg_info *const dbgi = get_dbg_info(&statement->base.source_position);
4357         type_t   *const type = skip_typeref(current_function_entity->declaration.type->function.return_type);
4358         ir_node  *      res  = statement->value ? expression_to_firm(statement->value) : NULL;
4359
4360         int in_len;
4361         if (!is_type_void(type)) {
4362                 ir_mode *const mode = get_ir_mode_storage(type);
4363                 if (res) {
4364                         res = create_conv(dbgi, res, mode);
4365                         res = do_strict_conv(dbgi, res);
4366                 } else {
4367                         res = new_Unknown(mode);
4368                 }
4369                 in_len = 1;
4370         } else {
4371                 in_len = 0;
4372         }
4373
4374         ir_node *const in[1] = { res };
4375         ir_node *const store = get_store();
4376         ir_node *const ret   = new_d_Return(dbgi, store, in_len, in);
4377
4378         ir_node *end_block = get_irg_end_block(current_ir_graph);
4379         add_immBlock_pred(end_block, ret);
4380
4381         set_unreachable_now();
4382         return NULL;
4383 }
4384
4385 static ir_node *expression_statement_to_firm(expression_statement_t *statement)
4386 {
4387         if (!currently_reachable())
4388                 return NULL;
4389
4390         return expression_to_firm(statement->expression);
4391 }
4392
4393 static void create_local_declarations(entity_t*);
4394
4395 static ir_node *compound_statement_to_firm(compound_statement_t *compound)
4396 {
4397         create_local_declarations(compound->scope.entities);
4398
4399         ir_node     *result    = NULL;
4400         statement_t *statement = compound->statements;
4401         for ( ; statement != NULL; statement = statement->base.next) {
4402                 result = statement_to_firm(statement);
4403         }
4404
4405         return result;
4406 }
4407
4408 static void create_global_variable(entity_t *entity)
4409 {
4410         ir_linkage          linkage    = IR_LINKAGE_DEFAULT;
4411         ir_visibility       visibility = ir_visibility_external;
4412         storage_class_tag_t storage
4413                 = (storage_class_tag_t)entity->declaration.storage_class;
4414         decl_modifiers_t    modifiers  = entity->declaration.modifiers;
4415         assert(entity->kind == ENTITY_VARIABLE);
4416
4417         switch (storage) {
4418         case STORAGE_CLASS_EXTERN: visibility = ir_visibility_external; break;
4419         case STORAGE_CLASS_STATIC: visibility = ir_visibility_local;    break;
4420         case STORAGE_CLASS_NONE:   visibility = ir_visibility_external; break;
4421         case STORAGE_CLASS_TYPEDEF:
4422         case STORAGE_CLASS_AUTO:
4423         case STORAGE_CLASS_REGISTER:
4424                 panic("invalid storage class for global var");
4425         }
4426
4427         /* "common" symbols */
4428         if (storage == STORAGE_CLASS_NONE
4429             && entity->variable.initializer == NULL
4430             && !entity->variable.thread_local
4431             && (modifiers & DM_WEAK) == 0) {
4432                 linkage |= IR_LINKAGE_MERGE;
4433         }
4434
4435         ir_type *var_type = get_glob_type();
4436         if (entity->variable.thread_local) {
4437                 var_type = get_tls_type();
4438         }
4439         create_variable_entity(entity, DECLARATION_KIND_GLOBAL_VARIABLE, var_type);
4440         ir_entity *irentity = entity->variable.v.entity;
4441         add_entity_linkage(irentity, linkage);
4442         set_entity_visibility(irentity, visibility);
4443         if (entity->variable.initializer == NULL
4444             && storage != STORAGE_CLASS_EXTERN) {
4445                 ir_initializer_t *null_init = get_initializer_null();
4446                 set_entity_initializer(irentity, null_init);
4447         }
4448 }
4449
4450 static void create_local_declaration(entity_t *entity)
4451 {
4452         assert(is_declaration(entity));
4453
4454         /* construct type */
4455         (void) get_ir_type(entity->declaration.type);
4456         if (entity->base.symbol == NULL) {
4457                 return;
4458         }
4459
4460         switch ((storage_class_tag_t) entity->declaration.storage_class) {
4461         case STORAGE_CLASS_STATIC:
4462                 if (entity->kind == ENTITY_FUNCTION) {
4463                         (void)get_function_entity(entity, NULL);
4464                 } else {
4465                         create_local_static_variable(entity);
4466                 }
4467                 return;
4468         case STORAGE_CLASS_EXTERN:
4469                 if (entity->kind == ENTITY_FUNCTION) {
4470                         assert(entity->function.statement == NULL);
4471                         (void)get_function_entity(entity, NULL);
4472                 } else {
4473                         create_global_variable(entity);
4474                         create_variable_initializer(entity);
4475                 }
4476                 return;
4477         case STORAGE_CLASS_NONE:
4478         case STORAGE_CLASS_AUTO:
4479         case STORAGE_CLASS_REGISTER:
4480                 if (entity->kind == ENTITY_FUNCTION) {
4481                         if (entity->function.statement != NULL) {
4482                                 ir_type *owner = get_irg_frame_type(current_ir_graph);
4483                                 (void)get_function_entity(entity, owner);
4484                                 entity->declaration.kind = DECLARATION_KIND_INNER_FUNCTION;
4485                                 enqueue_inner_function(entity);
4486                         } else {
4487                                 (void)get_function_entity(entity, NULL);
4488                         }
4489                 } else {
4490                         create_local_variable(entity);
4491                 }
4492                 return;
4493         case STORAGE_CLASS_TYPEDEF:
4494                 break;
4495         }
4496         panic("invalid storage class found");
4497 }
4498
4499 static void create_local_declarations(entity_t *e)
4500 {
4501         for (; e; e = e->base.next) {
4502                 if (is_declaration(e))
4503                         create_local_declaration(e);
4504         }
4505 }
4506
4507 static void initialize_local_declaration(entity_t *entity)
4508 {
4509         if (entity->base.symbol == NULL)
4510                 return;
4511
4512         // no need to emit code in dead blocks
4513         if (entity->declaration.storage_class != STORAGE_CLASS_STATIC
4514                         && !currently_reachable())
4515                 return;
4516
4517         switch ((declaration_kind_t) entity->declaration.kind) {
4518         case DECLARATION_KIND_LOCAL_VARIABLE:
4519         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY:
4520                 create_variable_initializer(entity);
4521                 return;
4522
4523         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
4524                 allocate_variable_length_array(entity);
4525                 return;
4526
4527         case DECLARATION_KIND_COMPOUND_MEMBER:
4528         case DECLARATION_KIND_GLOBAL_VARIABLE:
4529         case DECLARATION_KIND_FUNCTION:
4530         case DECLARATION_KIND_INNER_FUNCTION:
4531                 return;
4532
4533         case DECLARATION_KIND_PARAMETER:
4534         case DECLARATION_KIND_PARAMETER_ENTITY:
4535                 panic("can't initialize parameters");
4536
4537         case DECLARATION_KIND_UNKNOWN:
4538                 panic("can't initialize unknown declaration");
4539         }
4540         panic("invalid declaration kind");
4541 }
4542
4543 static ir_node *declaration_statement_to_firm(declaration_statement_t *statement)
4544 {
4545         entity_t *entity = statement->declarations_begin;
4546         if (entity == NULL)
4547                 return NULL;
4548
4549         entity_t *const last = statement->declarations_end;
4550         for ( ;; entity = entity->base.next) {
4551                 if (is_declaration(entity)) {
4552                         initialize_local_declaration(entity);
4553                 } else if (entity->kind == ENTITY_TYPEDEF) {
4554                         /* §6.7.7:3  Any array size expressions associated with variable length
4555                          * array declarators are evaluated each time the declaration of the
4556                          * typedef name is reached in the order of execution. */
4557                         type_t *const type = skip_typeref(entity->typedefe.type);
4558                         if (is_type_array(type) && type->array.is_vla)
4559                                 get_vla_size(&type->array);
4560                 }
4561                 if (entity == last)
4562                         break;
4563         }
4564
4565         return NULL;
4566 }
4567
4568 static ir_node *if_statement_to_firm(if_statement_t *statement)
4569 {
4570         create_local_declarations(statement->scope.entities);
4571
4572         /* Create the condition. */
4573         ir_node *true_block  = NULL;
4574         ir_node *false_block = NULL;
4575         if (currently_reachable()) {
4576                 true_block  = new_immBlock();
4577                 false_block = new_immBlock();
4578                 create_condition_evaluation(statement->condition, true_block, false_block);
4579                 mature_immBlock(true_block);
4580                 mature_immBlock(false_block);
4581         }
4582
4583         /* Create the true statement. */
4584         set_cur_block(true_block);
4585         statement_to_firm(statement->true_statement);
4586         ir_node *fallthrough_block = get_cur_block();
4587
4588         /* Create the false statement. */
4589         set_cur_block(false_block);
4590         if (statement->false_statement != NULL) {
4591                 statement_to_firm(statement->false_statement);
4592         }
4593
4594         /* Handle the block after the if-statement.  Minor simplification and
4595          * optimisation: Reuse the false/true block as fallthrough block, if the
4596          * true/false statement does not pass control to the fallthrough block, e.g.
4597          * in the typical if (x) return; pattern. */
4598         if (fallthrough_block) {
4599                 if (currently_reachable()) {
4600                         ir_node *const t_jump = new_r_Jmp(fallthrough_block);
4601                         ir_node *const f_jump = new_Jmp();
4602                         ir_node *const in[]   = { t_jump, f_jump };
4603                         fallthrough_block = new_Block(2, in);
4604                 }
4605                 set_cur_block(fallthrough_block);
4606         }
4607
4608         return NULL;
4609 }
4610
4611 /**
4612  * Add an unconditional jump to the target block.  If the source block is not
4613  * reachable, then a Bad predecessor is created to prevent Phi-less unreachable
4614  * loops.  This is necessary if the jump potentially enters a loop.
4615  */
4616 static void jump_to(ir_node *const target_block)
4617 {
4618         ir_node *const pred = currently_reachable() ? new_Jmp() : new_Bad(mode_X);
4619         add_immBlock_pred(target_block, pred);
4620 }
4621
4622 /**
4623  * Add an unconditional jump to the target block, if the current block is
4624  * reachable and do nothing otherwise.  This is only valid if the jump does not
4625  * enter a loop (a back edge is ok).
4626  */
4627 static void jump_if_reachable(ir_node *const target_block)
4628 {
4629         if (currently_reachable())
4630                 add_immBlock_pred(target_block, new_Jmp());
4631 }
4632
4633 static ir_node *while_statement_to_firm(while_statement_t *statement)
4634 {
4635         create_local_declarations(statement->scope.entities);
4636
4637         /* Create the header block */
4638         ir_node *const header_block = new_immBlock();
4639         jump_to(header_block);
4640
4641         /* Create the condition. */
4642         ir_node      *      body_block;
4643         ir_node      *      false_block;
4644         expression_t *const cond = statement->condition;
4645         if (is_constant_expression(cond) == EXPR_CLASS_CONSTANT &&
4646                         fold_constant_to_bool(cond)) {
4647                 /* Shortcut for while (true). */
4648                 body_block  = header_block;
4649                 false_block = NULL;
4650
4651                 keep_alive(header_block);
4652                 keep_all_memory(header_block);
4653         } else {
4654                 body_block  = new_immBlock();
4655                 false_block = new_immBlock();
4656
4657                 set_cur_block(header_block);
4658                 create_condition_evaluation(cond, body_block, false_block);
4659                 mature_immBlock(body_block);
4660         }
4661
4662         ir_node *const old_continue_label = continue_label;
4663         ir_node *const old_break_label    = break_label;
4664         continue_label = header_block;
4665         break_label    = false_block;
4666
4667         /* Create the loop body. */
4668         set_cur_block(body_block);
4669         statement_to_firm(statement->body);
4670         jump_if_reachable(header_block);
4671
4672         mature_immBlock(header_block);
4673         assert(false_block == NULL || false_block == break_label);
4674         false_block = break_label;
4675         if (false_block != NULL) {
4676                 mature_immBlock(false_block);
4677         }
4678         set_cur_block(false_block);
4679
4680         assert(continue_label == header_block);
4681         continue_label = old_continue_label;
4682         break_label    = old_break_label;
4683         return NULL;
4684 }
4685
4686 static ir_node *get_break_label(void)
4687 {
4688         if (break_label == NULL) {
4689                 break_label = new_immBlock();
4690         }
4691         return break_label;
4692 }
4693
4694 static ir_node *do_while_statement_to_firm(do_while_statement_t *statement)
4695 {
4696         create_local_declarations(statement->scope.entities);
4697
4698         /* create the header block */
4699         ir_node *header_block = new_immBlock();
4700
4701         /* the loop body */
4702         ir_node *body_block = new_immBlock();
4703         jump_to(body_block);
4704
4705         ir_node *old_continue_label = continue_label;
4706         ir_node *old_break_label    = break_label;
4707         continue_label              = header_block;
4708         break_label                 = NULL;
4709
4710         set_cur_block(body_block);
4711         statement_to_firm(statement->body);
4712         ir_node *const false_block = get_break_label();
4713
4714         assert(continue_label == header_block);
4715         continue_label = old_continue_label;
4716         break_label    = old_break_label;
4717
4718         jump_if_reachable(header_block);
4719
4720         /* create the condition */
4721         mature_immBlock(header_block);
4722         set_cur_block(header_block);
4723
4724         create_condition_evaluation(statement->condition, body_block, false_block);
4725         mature_immBlock(body_block);
4726         mature_immBlock(false_block);
4727
4728         set_cur_block(false_block);
4729         return NULL;
4730 }
4731
4732 static ir_node *for_statement_to_firm(for_statement_t *statement)
4733 {
4734         create_local_declarations(statement->scope.entities);
4735
4736         if (currently_reachable()) {
4737                 entity_t *entity = statement->scope.entities;
4738                 for ( ; entity != NULL; entity = entity->base.next) {
4739                         if (!is_declaration(entity))
4740                                 continue;
4741
4742                         initialize_local_declaration(entity);
4743                 }
4744
4745                 if (statement->initialisation != NULL) {
4746                         expression_to_firm(statement->initialisation);
4747                 }
4748         }
4749
4750         /* Create the header block */
4751         ir_node *const header_block = new_immBlock();
4752         jump_to(header_block);
4753
4754         /* Create the condition. */
4755         ir_node *body_block;
4756         ir_node *false_block;
4757         if (statement->condition != NULL) {
4758                 body_block  = new_immBlock();
4759                 false_block = new_immBlock();
4760
4761                 set_cur_block(header_block);
4762                 create_condition_evaluation(statement->condition, body_block, false_block);
4763                 mature_immBlock(body_block);
4764         } else {
4765                 /* for-ever. */
4766                 body_block  = header_block;
4767                 false_block = NULL;
4768
4769                 keep_alive(header_block);
4770                 keep_all_memory(header_block);
4771         }
4772
4773         /* Create the step block, if necessary. */
4774         ir_node      *      step_block = header_block;
4775         expression_t *const step       = statement->step;
4776         if (step != NULL) {
4777                 step_block = new_immBlock();
4778         }
4779
4780         ir_node *const old_continue_label = continue_label;
4781         ir_node *const old_break_label    = break_label;
4782         continue_label = step_block;
4783         break_label    = false_block;
4784
4785         /* Create the loop body. */
4786         set_cur_block(body_block);
4787         statement_to_firm(statement->body);
4788         jump_if_reachable(step_block);
4789
4790         /* Create the step code. */
4791         if (step != NULL) {
4792                 mature_immBlock(step_block);
4793                 set_cur_block(step_block);
4794                 expression_to_firm(step);
4795                 jump_if_reachable(header_block);
4796         }
4797
4798         mature_immBlock(header_block);
4799         assert(false_block == NULL || false_block == break_label);
4800         false_block = break_label;
4801         if (false_block != NULL) {
4802                 mature_immBlock(false_block);
4803         }
4804         set_cur_block(false_block);
4805
4806         assert(continue_label == step_block);
4807         continue_label = old_continue_label;
4808         break_label    = old_break_label;
4809         return NULL;
4810 }
4811
4812 static ir_node *create_jump_statement(const statement_t *statement, ir_node *target_block)
4813 {
4814         if (!currently_reachable())
4815                 return NULL;
4816
4817         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
4818         ir_node  *jump = new_d_Jmp(dbgi);
4819         add_immBlock_pred(target_block, jump);
4820
4821         set_unreachable_now();
4822         return NULL;
4823 }
4824
4825 static ir_switch_table *create_switch_table(const switch_statement_t *statement)
4826 {
4827         /* determine number of cases */
4828         size_t n_cases = 0;
4829         for (case_label_statement_t *l = statement->first_case; l != NULL;
4830              l = l->next) {
4831                 /* default case */
4832                 if (l->expression == NULL)
4833                         continue;
4834                 if (l->is_empty_range)
4835                         continue;
4836                 ++n_cases;
4837         }
4838
4839         ir_switch_table *res = ir_new_switch_table(current_ir_graph, n_cases);
4840         size_t           i   = 0;
4841         for (case_label_statement_t *l = statement->first_case; l != NULL;
4842              l = l->next) {
4843             if (l->expression == NULL) {
4844                         l->pn = pn_Switch_default;
4845                         continue;
4846                 }
4847                 if (l->is_empty_range)
4848                         continue;
4849                 ir_tarval *min = fold_constant_to_tarval(l->expression);
4850                 ir_tarval *max = min;
4851                 long       pn  = (long) i+1;
4852                 if (l->end_range != NULL)
4853                         max = fold_constant_to_tarval(l->end_range);
4854                 ir_switch_table_set(res, i++, min, max, pn);
4855                 l->pn = pn;
4856         }
4857         return res;
4858 }
4859
4860 static ir_node *switch_statement_to_firm(switch_statement_t *statement)
4861 {
4862         dbg_info *dbgi        = get_dbg_info(&statement->base.source_position);
4863         ir_node  *switch_node = NULL;
4864
4865         if (currently_reachable()) {
4866                 ir_node *expression = expression_to_firm(statement->expression);
4867                 ir_switch_table *table = create_switch_table(statement);
4868                 unsigned n_outs = (unsigned)ir_switch_table_get_n_entries(table) + 1;
4869
4870                 switch_node = new_d_Switch(dbgi, expression, n_outs, table);
4871         }
4872
4873         set_unreachable_now();
4874
4875         ir_node *const old_switch            = current_switch;
4876         ir_node *const old_break_label       = break_label;
4877         const bool     old_saw_default_label = saw_default_label;
4878         saw_default_label                    = false;
4879         current_switch                       = switch_node;
4880         break_label                          = NULL;
4881
4882         statement_to_firm(statement->body);
4883
4884         if (currently_reachable()) {
4885                 add_immBlock_pred(get_break_label(), new_Jmp());
4886         }
4887
4888         if (!saw_default_label && switch_node) {
4889                 ir_node *proj = new_d_Proj(dbgi, switch_node, mode_X, pn_Switch_default);
4890                 add_immBlock_pred(get_break_label(), proj);
4891         }
4892
4893         if (break_label != NULL) {
4894                 mature_immBlock(break_label);
4895         }
4896         set_cur_block(break_label);
4897
4898         assert(current_switch == switch_node);
4899         current_switch    = old_switch;
4900         break_label       = old_break_label;
4901         saw_default_label = old_saw_default_label;
4902         return NULL;
4903 }
4904
4905 static ir_node *case_label_to_firm(const case_label_statement_t *statement)
4906 {
4907         if (statement->is_empty_range)
4908                 return NULL;
4909
4910         if (current_switch != NULL) {
4911                 ir_node *block = new_immBlock();
4912                 /* Fallthrough from previous case */
4913                 jump_if_reachable(block);
4914
4915                 ir_node  *const proj = new_Proj(current_switch, mode_X, statement->pn);
4916                 add_immBlock_pred(block, proj);
4917                 if (statement->expression == NULL)
4918                         saw_default_label = true;
4919
4920                 mature_immBlock(block);
4921                 set_cur_block(block);
4922         }
4923
4924         return statement_to_firm(statement->statement);
4925 }
4926
4927 static ir_node *label_to_firm(const label_statement_t *statement)
4928 {
4929         ir_node *block = get_label_block(statement->label);
4930         jump_to(block);
4931
4932         set_cur_block(block);
4933         keep_alive(block);
4934         keep_all_memory(block);
4935
4936         return statement_to_firm(statement->statement);
4937 }
4938
4939 static ir_node *computed_goto_to_firm(computed_goto_statement_t const *const statement)
4940 {
4941         if (!currently_reachable())
4942                 return NULL;
4943
4944         ir_node  *const irn  = expression_to_firm(statement->expression);
4945         dbg_info *const dbgi = get_dbg_info(&statement->base.source_position);
4946         ir_node  *const ijmp = new_d_IJmp(dbgi, irn);
4947
4948         set_irn_link(ijmp, ijmp_list);
4949         ijmp_list = ijmp;
4950
4951         set_unreachable_now();
4952         return NULL;
4953 }
4954
4955 static ir_node *asm_statement_to_firm(const asm_statement_t *statement)
4956 {
4957         bool needs_memory = false;
4958
4959         if (statement->is_volatile) {
4960                 needs_memory = true;
4961         }
4962
4963         size_t         n_clobbers = 0;
4964         asm_clobber_t *clobber    = statement->clobbers;
4965         for ( ; clobber != NULL; clobber = clobber->next) {
4966                 const char *clobber_str = clobber->clobber.begin;
4967
4968                 if (!be_is_valid_clobber(clobber_str)) {
4969                         errorf(&statement->base.source_position,
4970                                    "invalid clobber '%s' specified", clobber->clobber);
4971                         continue;
4972                 }
4973
4974                 if (streq(clobber_str, "memory")) {
4975                         needs_memory = true;
4976                         continue;
4977                 }
4978
4979                 ident *id = new_id_from_str(clobber_str);
4980                 obstack_ptr_grow(&asm_obst, id);
4981                 ++n_clobbers;
4982         }
4983         assert(obstack_object_size(&asm_obst) == n_clobbers * sizeof(ident*));
4984         ident **clobbers = NULL;
4985         if (n_clobbers > 0) {
4986                 clobbers = obstack_finish(&asm_obst);
4987         }
4988
4989         size_t n_inputs  = 0;
4990         asm_argument_t *argument = statement->inputs;
4991         for ( ; argument != NULL; argument = argument->next)
4992                 n_inputs++;
4993         size_t n_outputs = 0;
4994         argument = statement->outputs;
4995         for ( ; argument != NULL; argument = argument->next)
4996                 n_outputs++;
4997
4998         unsigned next_pos = 0;
4999
5000         ir_node *ins[n_inputs + n_outputs + 1];
5001         size_t   in_size = 0;
5002
5003         ir_asm_constraint tmp_in_constraints[n_outputs];
5004
5005         const expression_t *out_exprs[n_outputs];
5006         ir_node            *out_addrs[n_outputs];
5007         size_t              out_size = 0;
5008
5009         argument = statement->outputs;
5010         for ( ; argument != NULL; argument = argument->next) {
5011                 const char *constraints = argument->constraints.begin;
5012                 asm_constraint_flags_t asm_flags
5013                         = be_parse_asm_constraints(constraints);
5014
5015                 {
5016                         source_position_t const *const pos = &statement->base.source_position;
5017                         if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
5018                                 warningf(WARN_OTHER, pos, "some constraints in '%s' are not supported", constraints);
5019                         }
5020                         if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
5021                                 errorf(pos, "some constraints in '%s' are invalid", constraints);
5022                                 continue;
5023                         }
5024                         if (! (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE)) {
5025                                 errorf(pos, "no write flag specified for output constraints '%s'", constraints);
5026                                 continue;
5027                         }
5028                 }
5029
5030                 unsigned pos = next_pos++;
5031                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
5032                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
5033                         expression_t *expr = argument->expression;
5034                         ir_node      *addr = expression_to_addr(expr);
5035                         /* in+output, construct an artifical same_as constraint on the
5036                          * input */
5037                         if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_READ) {
5038                                 char     buf[64];
5039                                 ir_node *value = get_value_from_lvalue(expr, addr);
5040
5041                                 snprintf(buf, sizeof(buf), "%u", (unsigned) out_size);
5042
5043                                 ir_asm_constraint constraint;
5044                                 constraint.pos              = pos;
5045                                 constraint.constraint       = new_id_from_str(buf);
5046                                 constraint.mode             = get_ir_mode_storage(expr->base.type);
5047                                 tmp_in_constraints[in_size] = constraint;
5048                                 ins[in_size] = value;
5049
5050                                 ++in_size;
5051                         }
5052
5053                         out_exprs[out_size] = expr;
5054                         out_addrs[out_size] = addr;
5055                         ++out_size;
5056                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
5057                         /* pure memory ops need no input (but we have to make sure we
5058                          * attach to the memory) */
5059                         assert(! (asm_flags &
5060                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
5061                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
5062                         needs_memory = true;
5063
5064                         /* we need to attach the address to the inputs */
5065                         expression_t *expr = argument->expression;
5066
5067                         ir_asm_constraint constraint;
5068                         constraint.pos              = pos;
5069                         constraint.constraint       = new_id_from_str(constraints);
5070                         constraint.mode             = mode_M;
5071                         tmp_in_constraints[in_size] = constraint;
5072
5073                         ins[in_size]          = expression_to_addr(expr);
5074                         ++in_size;
5075                         continue;
5076                 } else {
5077                         errorf(&statement->base.source_position,
5078                                "only modifiers but no place set in constraints '%s'",
5079                                constraints);
5080                         continue;
5081                 }
5082
5083                 ir_asm_constraint constraint;
5084                 constraint.pos        = pos;
5085                 constraint.constraint = new_id_from_str(constraints);
5086                 constraint.mode       = get_ir_mode_storage(argument->expression->base.type);
5087
5088                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5089         }
5090         assert(obstack_object_size(&asm_obst)
5091                         == out_size * sizeof(ir_asm_constraint));
5092         ir_asm_constraint *output_constraints = obstack_finish(&asm_obst);
5093
5094
5095         obstack_grow(&asm_obst, tmp_in_constraints,
5096                      in_size * sizeof(tmp_in_constraints[0]));
5097         /* find and count input and output arguments */
5098         argument = statement->inputs;
5099         for ( ; argument != NULL; argument = argument->next) {
5100                 const char *constraints = argument->constraints.begin;
5101                 asm_constraint_flags_t asm_flags
5102                         = be_parse_asm_constraints(constraints);
5103
5104                 if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
5105                         errorf(&statement->base.source_position,
5106                                "some constraints in '%s' are not supported", constraints);
5107                         continue;
5108                 }
5109                 if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
5110                         errorf(&statement->base.source_position,
5111                                "some constraints in '%s' are invalid", constraints);
5112                         continue;
5113                 }
5114                 if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE) {
5115                         errorf(&statement->base.source_position,
5116                                "write flag specified for input constraints '%s'",
5117                                constraints);
5118                         continue;
5119                 }
5120
5121                 ir_node *input;
5122                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
5123                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
5124                         /* we can treat this as "normal" input */
5125                         input = expression_to_firm(argument->expression);
5126                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
5127                         /* pure memory ops need no input (but we have to make sure we
5128                          * attach to the memory) */
5129                         assert(! (asm_flags &
5130                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
5131                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
5132                         needs_memory = true;
5133                         input = expression_to_addr(argument->expression);
5134                 } else {
5135                         errorf(&statement->base.source_position,
5136                                "only modifiers but no place set in constraints '%s'",
5137                                constraints);
5138                         continue;
5139                 }
5140
5141                 ir_asm_constraint constraint;
5142                 constraint.pos        = next_pos++;
5143                 constraint.constraint = new_id_from_str(constraints);
5144                 constraint.mode       = get_irn_mode(input);
5145
5146                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5147                 ins[in_size++] = input;
5148         }
5149
5150         if (needs_memory) {
5151                 ir_asm_constraint constraint;
5152                 constraint.pos        = next_pos++;
5153                 constraint.constraint = new_id_from_str("");
5154                 constraint.mode       = mode_M;
5155
5156                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5157                 ins[in_size++] = get_store();
5158         }
5159
5160         assert(obstack_object_size(&asm_obst)
5161                         == in_size * sizeof(ir_asm_constraint));
5162         ir_asm_constraint *input_constraints = obstack_finish(&asm_obst);
5163
5164         /* create asm node */
5165         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
5166
5167         ident *asm_text = new_id_from_str(statement->asm_text.begin);
5168
5169         ir_node *node = new_d_ASM(dbgi, in_size, ins, input_constraints,
5170                                   out_size, output_constraints,
5171                                   n_clobbers, clobbers, asm_text);
5172
5173         if (statement->is_volatile) {
5174                 set_irn_pinned(node, op_pin_state_pinned);
5175         } else {
5176                 set_irn_pinned(node, op_pin_state_floats);
5177         }
5178
5179         /* create output projs & connect them */
5180         if (needs_memory) {
5181                 ir_node *projm = new_Proj(node, mode_M, out_size);
5182                 set_store(projm);
5183         }
5184
5185         size_t i;
5186         for (i = 0; i < out_size; ++i) {
5187                 const expression_t *out_expr = out_exprs[i];
5188                 long                pn       = i;
5189                 ir_mode            *mode     = get_ir_mode_storage(out_expr->base.type);
5190                 ir_node            *proj     = new_Proj(node, mode, pn);
5191                 ir_node            *addr     = out_addrs[i];
5192
5193                 set_value_for_expression_addr(out_expr, proj, addr);
5194         }
5195
5196         return NULL;
5197 }
5198
5199 static ir_node *ms_try_statement_to_firm(ms_try_statement_t *statement)
5200 {
5201         statement_to_firm(statement->try_statement);
5202         source_position_t const *const pos = &statement->base.source_position;
5203         warningf(WARN_OTHER, pos, "structured exception handling ignored");
5204         return NULL;
5205 }
5206
5207 static ir_node *leave_statement_to_firm(leave_statement_t *statement)
5208 {
5209         errorf(&statement->base.source_position, "__leave not supported yet");
5210         return NULL;
5211 }
5212
5213 /**
5214  * Transform a statement.
5215  */
5216 static ir_node *statement_to_firm(statement_t *const stmt)
5217 {
5218 #ifndef NDEBUG
5219         assert(!stmt->base.transformed);
5220         stmt->base.transformed = true;
5221 #endif
5222
5223         switch (stmt->kind) {
5224         case STATEMENT_ASM:           return asm_statement_to_firm(        &stmt->asms);
5225         case STATEMENT_CASE_LABEL:    return case_label_to_firm(           &stmt->case_label);
5226         case STATEMENT_COMPOUND:      return compound_statement_to_firm(   &stmt->compound);
5227         case STATEMENT_COMPUTED_GOTO: return computed_goto_to_firm(        &stmt->computed_goto);
5228         case STATEMENT_DECLARATION:   return declaration_statement_to_firm(&stmt->declaration);
5229         case STATEMENT_DO_WHILE:      return do_while_statement_to_firm(   &stmt->do_while);
5230         case STATEMENT_EMPTY:         return NULL; /* nothing */
5231         case STATEMENT_EXPRESSION:    return expression_statement_to_firm( &stmt->expression);
5232         case STATEMENT_FOR:           return for_statement_to_firm(        &stmt->fors);
5233         case STATEMENT_IF:            return if_statement_to_firm(         &stmt->ifs);
5234         case STATEMENT_LABEL:         return label_to_firm(                &stmt->label);
5235         case STATEMENT_LEAVE:         return leave_statement_to_firm(      &stmt->leave);
5236         case STATEMENT_MS_TRY:        return ms_try_statement_to_firm(     &stmt->ms_try);
5237         case STATEMENT_RETURN:        return return_statement_to_firm(     &stmt->returns);
5238         case STATEMENT_SWITCH:        return switch_statement_to_firm(     &stmt->switchs);
5239         case STATEMENT_WHILE:         return while_statement_to_firm(      &stmt->whiles);
5240
5241         case STATEMENT_BREAK:         return create_jump_statement(stmt, get_break_label());
5242         case STATEMENT_CONTINUE:      return create_jump_statement(stmt, continue_label);
5243         case STATEMENT_GOTO:          return create_jump_statement(stmt, get_label_block(stmt->gotos.label));
5244
5245         case STATEMENT_ERROR: panic("error statement found");
5246         }
5247         panic("statement not implemented");
5248 }
5249
5250 static int count_local_variables(const entity_t *entity,
5251                                  const entity_t *const last)
5252 {
5253         int count = 0;
5254         entity_t const *const end = last != NULL ? last->base.next : NULL;
5255         for (; entity != end; entity = entity->base.next) {
5256                 if ((entity->kind == ENTITY_VARIABLE || entity->kind == ENTITY_PARAMETER) &&
5257                     !entity->variable.address_taken                                       &&
5258                     is_type_scalar(skip_typeref(entity->declaration.type)))
5259                         ++count;
5260         }
5261         return count;
5262 }
5263
5264 static void count_local_variables_in_stmt(statement_t *stmt, void *const env)
5265 {
5266         int *const count = env;
5267
5268         switch (stmt->kind) {
5269         case STATEMENT_DECLARATION: {
5270                 const declaration_statement_t *const decl_stmt = &stmt->declaration;
5271                 *count += count_local_variables(decl_stmt->declarations_begin,
5272                                 decl_stmt->declarations_end);
5273                 break;
5274         }
5275
5276         case STATEMENT_FOR:
5277                 *count += count_local_variables(stmt->fors.scope.entities, NULL);
5278                 break;
5279
5280         default:
5281                 break;
5282         }
5283 }
5284
5285 /**
5286  * Return the number of local (alias free) variables used by a function.
5287  */
5288 static int get_function_n_local_vars(entity_t *entity)
5289 {
5290         const function_t *function = &entity->function;
5291         int count = 0;
5292
5293         /* count parameters */
5294         count += count_local_variables(function->parameters.entities, NULL);
5295
5296         /* count local variables declared in body */
5297         walk_statements(function->statement, count_local_variables_in_stmt, &count);
5298         return count;
5299 }
5300
5301 /**
5302  * Build Firm code for the parameters of a function.
5303  */
5304 static void initialize_function_parameters(entity_t *entity)
5305 {
5306         assert(entity->kind == ENTITY_FUNCTION);
5307         ir_graph *irg             = current_ir_graph;
5308         ir_node  *args            = get_irg_args(irg);
5309         int       n               = 0;
5310         ir_type  *function_irtype;
5311
5312         if (entity->function.need_closure) {
5313                 /* add an extra parameter for the static link */
5314                 entity->function.static_link = new_r_Proj(args, mode_P_data, 0);
5315                 ++n;
5316
5317                 /* Matze: IMO this is wrong, nested functions should have an own
5318                  * type and not rely on strange parameters... */
5319                 function_irtype = create_method_type(&entity->declaration.type->function, true);
5320         } else {
5321                 function_irtype = get_ir_type(entity->declaration.type);
5322         }
5323
5324
5325
5326         entity_t *parameter = entity->function.parameters.entities;
5327         for ( ; parameter != NULL; parameter = parameter->base.next, ++n) {
5328                 if (parameter->kind != ENTITY_PARAMETER)
5329                         continue;
5330
5331                 assert(parameter->declaration.kind == DECLARATION_KIND_UNKNOWN);
5332                 type_t *type = skip_typeref(parameter->declaration.type);
5333
5334                 assert(!is_type_array(type));
5335                 bool const needs_entity = parameter->variable.address_taken || is_type_compound(type);
5336
5337                 ir_type *param_irtype = get_method_param_type(function_irtype, n);
5338                 if (needs_entity) {
5339                         ir_type   *frame_type = get_irg_frame_type(irg);
5340                         ir_entity *param
5341                                 = new_parameter_entity(frame_type, n, param_irtype);
5342                         parameter->declaration.kind  = DECLARATION_KIND_PARAMETER_ENTITY;
5343                         parameter->variable.v.entity = param;
5344                         continue;
5345                 }
5346
5347                 ir_mode *param_mode = get_type_mode(param_irtype);
5348                 long     pn         = n;
5349                 ir_node *value      = new_r_Proj(args, param_mode, pn);
5350
5351                 ir_mode *mode = get_ir_mode_storage(type);
5352                 value = create_conv(NULL, value, mode);
5353                 value = do_strict_conv(NULL, value);
5354
5355                 parameter->declaration.kind        = DECLARATION_KIND_PARAMETER;
5356                 parameter->variable.v.value_number = next_value_number_function;
5357                 set_irg_loc_description(current_ir_graph, next_value_number_function,
5358                                         parameter);
5359                 ++next_value_number_function;
5360
5361                 set_value(parameter->variable.v.value_number, value);
5362         }
5363 }
5364
5365 /**
5366  * Handle additional decl modifiers for IR-graphs
5367  *
5368  * @param irg            the IR-graph
5369  * @param dec_modifiers  additional modifiers
5370  */
5371 static void handle_decl_modifier_irg(ir_graph *irg,
5372                                      decl_modifiers_t decl_modifiers)
5373 {
5374         if (decl_modifiers & DM_NAKED) {
5375                 /* TRUE if the declaration includes the Microsoft
5376                    __declspec(naked) specifier. */
5377                 add_irg_additional_properties(irg, mtp_property_naked);
5378         }
5379         if (decl_modifiers & DM_FORCEINLINE) {
5380                 /* TRUE if the declaration includes the
5381                    Microsoft __forceinline specifier. */
5382                 set_irg_inline_property(irg, irg_inline_forced);
5383         }
5384         if (decl_modifiers & DM_NOINLINE) {
5385                 /* TRUE if the declaration includes the Microsoft
5386                    __declspec(noinline) specifier. */
5387                 set_irg_inline_property(irg, irg_inline_forbidden);
5388         }
5389 }
5390
5391 static void add_function_pointer(ir_type *segment, ir_entity *method,
5392                                  const char *unique_template)
5393 {
5394         ir_type   *method_type  = get_entity_type(method);
5395         ir_type   *ptr_type     = new_type_pointer(method_type);
5396
5397         /* these entities don't really have a name but firm only allows
5398          * "" in ld_ident.
5399          * Note that we mustn't give these entities a name since for example
5400          * Mach-O doesn't allow them. */
5401         ident     *ide          = id_unique(unique_template);
5402         ir_entity *ptr          = new_entity(segment, ide, ptr_type);
5403         ir_graph  *irg          = get_const_code_irg();
5404         ir_node   *val          = new_rd_SymConst_addr_ent(NULL, irg, mode_P_code,
5405                                                            method);
5406
5407         set_entity_ld_ident(ptr, new_id_from_chars("", 0));
5408         set_entity_compiler_generated(ptr, 1);
5409         set_entity_visibility(ptr, ir_visibility_private);
5410         add_entity_linkage(ptr, IR_LINKAGE_CONSTANT|IR_LINKAGE_HIDDEN_USER);
5411         set_atomic_ent_value(ptr, val);
5412 }
5413
5414 /**
5415  * Generate possible IJmp branches to a given label block.
5416  */
5417 static void gen_ijmp_branches(ir_node *block)
5418 {
5419         ir_node *ijmp;
5420         for (ijmp = ijmp_list; ijmp != NULL; ijmp = get_irn_link(ijmp)) {
5421                 add_immBlock_pred(block, ijmp);
5422         }
5423 }
5424
5425 /**
5426  * Create code for a function and all inner functions.
5427  *
5428  * @param entity  the function entity
5429  */
5430 static void create_function(entity_t *entity)
5431 {
5432         assert(entity->kind == ENTITY_FUNCTION);
5433         ir_entity *function_entity = get_function_entity(entity, current_outer_frame);
5434
5435         if (entity->function.statement == NULL)
5436                 return;
5437
5438         inner_functions     = NULL;
5439         current_trampolines = NULL;
5440
5441         if (entity->declaration.modifiers & DM_CONSTRUCTOR) {
5442                 ir_type *segment = get_segment_type(IR_SEGMENT_CONSTRUCTORS);
5443                 add_function_pointer(segment, function_entity, "constructor_ptr.%u");
5444         }
5445         if (entity->declaration.modifiers & DM_DESTRUCTOR) {
5446                 ir_type *segment = get_segment_type(IR_SEGMENT_DESTRUCTORS);
5447                 add_function_pointer(segment, function_entity, "destructor_ptr.%u");
5448         }
5449
5450         current_function_entity = entity;
5451         current_function_name   = NULL;
5452         current_funcsig         = NULL;
5453
5454         assert(all_labels == NULL);
5455         all_labels = NEW_ARR_F(label_t *, 0);
5456         ijmp_list  = NULL;
5457
5458         int       n_local_vars = get_function_n_local_vars(entity);
5459         ir_graph *irg          = new_ir_graph(function_entity, n_local_vars);
5460         current_ir_graph = irg;
5461
5462         ir_graph *old_current_function = current_function;
5463         current_function = irg;
5464
5465         ir_entity *const old_current_vararg_entity = current_vararg_entity;
5466         current_vararg_entity = NULL;
5467
5468         set_irg_fp_model(irg, firm_fp_model);
5469         tarval_enable_fp_ops(1);
5470         set_irn_dbg_info(get_irg_start_block(irg),
5471                          get_entity_dbg_info(function_entity));
5472
5473         /* set inline flags */
5474         if (entity->function.is_inline)
5475                 set_irg_inline_property(irg, irg_inline_recomended);
5476         handle_decl_modifier_irg(irg, entity->declaration.modifiers);
5477
5478         next_value_number_function = 0;
5479         initialize_function_parameters(entity);
5480         current_static_link = entity->function.static_link;
5481
5482         statement_to_firm(entity->function.statement);
5483
5484         ir_node *end_block = get_irg_end_block(irg);
5485
5486         /* do we have a return statement yet? */
5487         if (currently_reachable()) {
5488                 type_t *type = skip_typeref(entity->declaration.type);
5489                 assert(is_type_function(type));
5490                 type_t *const return_type = skip_typeref(type->function.return_type);
5491
5492                 ir_node *ret;
5493                 if (is_type_void(return_type)) {
5494                         ret = new_Return(get_store(), 0, NULL);
5495                 } else {
5496                         ir_mode *const mode = get_ir_mode_storage(return_type);
5497
5498                         ir_node *in[1];
5499                         /* §5.1.2.2.3 main implicitly returns 0 */
5500                         if (is_main(entity)) {
5501                                 in[0] = new_Const(get_mode_null(mode));
5502                         } else {
5503                                 in[0] = new_Unknown(mode);
5504                         }
5505                         ret = new_Return(get_store(), 1, in);
5506                 }
5507                 add_immBlock_pred(end_block, ret);
5508         }
5509
5510         for (int i = ARR_LEN(all_labels) - 1; i >= 0; --i) {
5511                 label_t *label = all_labels[i];
5512                 if (label->address_taken) {
5513                         gen_ijmp_branches(label->block);
5514                 }
5515                 mature_immBlock(label->block);
5516         }
5517
5518         DEL_ARR_F(all_labels);
5519         all_labels = NULL;
5520
5521         irg_finalize_cons(irg);
5522
5523         /* finalize the frame type */
5524         ir_type *frame_type = get_irg_frame_type(irg);
5525         int      n          = get_compound_n_members(frame_type);
5526         int      align_all  = 4;
5527         int      offset     = 0;
5528         for (int i = 0; i < n; ++i) {
5529                 ir_entity *member      = get_compound_member(frame_type, i);
5530                 ir_type   *entity_type = get_entity_type(member);
5531
5532                 int align = get_type_alignment_bytes(entity_type);
5533                 if (align > align_all)
5534                         align_all = align;
5535                 int misalign = 0;
5536                 if (align > 0) {
5537                         misalign  = offset % align;
5538                         if (misalign > 0) {
5539                                 offset += align - misalign;
5540                         }
5541                 }
5542
5543                 set_entity_offset(member, offset);
5544                 offset += get_type_size_bytes(entity_type);
5545         }
5546         set_type_size_bytes(frame_type, offset);
5547         set_type_alignment_bytes(frame_type, align_all);
5548
5549         irg_verify(irg, VERIFY_ENFORCE_SSA);
5550         current_vararg_entity = old_current_vararg_entity;
5551         current_function      = old_current_function;
5552
5553         if (current_trampolines != NULL) {
5554                 DEL_ARR_F(current_trampolines);
5555                 current_trampolines = NULL;
5556         }
5557
5558         /* create inner functions if any */
5559         entity_t **inner = inner_functions;
5560         if (inner != NULL) {
5561                 ir_type *rem_outer_frame      = current_outer_frame;
5562                 current_outer_frame           = get_irg_frame_type(current_ir_graph);
5563                 for (int i = ARR_LEN(inner) - 1; i >= 0; --i) {
5564                         create_function(inner[i]);
5565                 }
5566                 DEL_ARR_F(inner);
5567
5568                 current_outer_frame      = rem_outer_frame;
5569         }
5570 }
5571
5572 static void scope_to_firm(scope_t *scope)
5573 {
5574         /* first pass: create declarations */
5575         entity_t *entity = scope->entities;
5576         for ( ; entity != NULL; entity = entity->base.next) {
5577                 if (entity->base.symbol == NULL)
5578                         continue;
5579
5580                 if (entity->kind == ENTITY_FUNCTION) {
5581                         if (entity->function.btk != BUILTIN_NONE) {
5582                                 /* builtins have no representation */
5583                                 continue;
5584                         }
5585                         (void)get_function_entity(entity, NULL);
5586                 } else if (entity->kind == ENTITY_VARIABLE) {
5587                         create_global_variable(entity);
5588                 } else if (entity->kind == ENTITY_NAMESPACE) {
5589                         scope_to_firm(&entity->namespacee.members);
5590                 }
5591         }
5592
5593         /* second pass: create code/initializers */
5594         entity = scope->entities;
5595         for ( ; entity != NULL; entity = entity->base.next) {
5596                 if (entity->base.symbol == NULL)
5597                         continue;
5598
5599                 if (entity->kind == ENTITY_FUNCTION) {
5600                         if (entity->function.btk != BUILTIN_NONE) {
5601                                 /* builtins have no representation */
5602                                 continue;
5603                         }
5604                         create_function(entity);
5605                 } else if (entity->kind == ENTITY_VARIABLE) {
5606                         assert(entity->declaration.kind
5607                                         == DECLARATION_KIND_GLOBAL_VARIABLE);
5608                         current_ir_graph = get_const_code_irg();
5609                         create_variable_initializer(entity);
5610                 }
5611         }
5612 }
5613
5614 void init_ast2firm(void)
5615 {
5616         obstack_init(&asm_obst);
5617         init_atomic_modes();
5618
5619         ir_set_debug_retrieve(dbg_retrieve);
5620         ir_set_type_debug_retrieve(dbg_print_type_dbg_info);
5621
5622         /* create idents for all known runtime functions */
5623         for (size_t i = 0; i < lengthof(rts_data); ++i) {
5624                 rts_idents[i] = new_id_from_str(rts_data[i].name);
5625         }
5626
5627         entitymap_init(&entitymap);
5628 }
5629
5630 static void init_ir_types(void)
5631 {
5632         static int ir_types_initialized = 0;
5633         if (ir_types_initialized)
5634                 return;
5635         ir_types_initialized = 1;
5636
5637         ir_type_char    = get_ir_type(type_char);
5638         ir_type_wchar_t = get_ir_type(type_wchar_t);
5639
5640         be_params             = be_get_backend_param();
5641         mode_float_arithmetic = be_params->mode_float_arithmetic;
5642
5643         stack_param_align     = be_params->stack_param_align;
5644 }
5645
5646 void exit_ast2firm(void)
5647 {
5648         entitymap_destroy(&entitymap);
5649         obstack_free(&asm_obst, NULL);
5650 }
5651
5652 static void global_asm_to_firm(statement_t *s)
5653 {
5654         for (; s != NULL; s = s->base.next) {
5655                 assert(s->kind == STATEMENT_ASM);
5656
5657                 char const *const text = s->asms.asm_text.begin;
5658                 size_t      const size = s->asms.asm_text.size;
5659                 ident      *const id   = new_id_from_chars(text, size);
5660                 add_irp_asm(id);
5661         }
5662 }
5663
5664 static const char *get_cwd(void)
5665 {
5666         static char buf[1024];
5667         if (buf[0] == '\0')
5668                 getcwd(buf, sizeof(buf));
5669         return buf;
5670 }
5671
5672 void translation_unit_to_firm(translation_unit_t *unit)
5673 {
5674         if (c_mode & _CXX) {
5675                 be_dwarf_set_source_language(DW_LANG_C_plus_plus);
5676         } else if (c_mode & _C99) {
5677                 be_dwarf_set_source_language(DW_LANG_C99);
5678         } else if (c_mode & _C89) {
5679                 be_dwarf_set_source_language(DW_LANG_C89);
5680         } else {
5681                 be_dwarf_set_source_language(DW_LANG_C);
5682         }
5683         be_dwarf_set_compilation_directory(get_cwd());
5684
5685         /* initialize firm arithmetic */
5686         tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
5687         ir_set_uninitialized_local_variable_func(uninitialized_local_var);
5688
5689         /* just to be sure */
5690         continue_label           = NULL;
5691         break_label              = NULL;
5692         current_switch           = NULL;
5693         current_translation_unit = unit;
5694
5695         init_ir_types();
5696
5697         scope_to_firm(&unit->scope);
5698         global_asm_to_firm(unit->global_asm);
5699
5700         current_ir_graph         = NULL;
5701         current_translation_unit = NULL;
5702 }