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_const_char;
  67 static ir_type *ir_type_wchar_t;
  68
  69 /* architecture specific floating point arithmetic mode (if any) */
  70 static ir_mode *mode_float_arithmetic;
  71
  72 /* alignment of stack parameters */
  73 static unsigned stack_param_align;
  74
  75 static int        next_value_number_function;
  76 static ir_node   *continue_label;
  77 static ir_node   *break_label;
  78 static ir_node   *current_switch;
  79 static bool       saw_default_label;
  80 static label_t  **all_labels;
  81 static entity_t **inner_functions;
  82 static ir_node   *ijmp_list;
  83 static bool       constant_folding;
  84
  85 static const entity_t     *current_function_entity;
  86 static ir_node            *current_function_name;
  87 static ir_node            *current_funcsig;
  88 static ir_graph           *current_function;
  89 static translation_unit_t *current_translation_unit;
  90 static trampoline_region  *current_trampolines;
  91 static ir_type            *current_outer_frame;
  92 static ir_node            *current_static_link;
  93 static ir_entity          *current_vararg_entity;
  94
  95 static entitymap_t  entitymap;
  96
  97 static struct obstack asm_obst;
  98
  99 typedef enum declaration_kind_t {
 100         DECLARATION_KIND_UNKNOWN,
 101         DECLARATION_KIND_VARIABLE_LENGTH_ARRAY,
 102         DECLARATION_KIND_GLOBAL_VARIABLE,
 103         DECLARATION_KIND_LOCAL_VARIABLE,
 104         DECLARATION_KIND_LOCAL_VARIABLE_ENTITY,
 105         DECLARATION_KIND_PARAMETER,
 106         DECLARATION_KIND_PARAMETER_ENTITY,
 107         DECLARATION_KIND_FUNCTION,
 108         DECLARATION_KIND_COMPOUND_MEMBER,
 109         DECLARATION_KIND_INNER_FUNCTION
 110 } declaration_kind_t;
 111
 112 static ir_type *get_ir_type_incomplete(type_t *type);
 113
 114 static void enqueue_inner_function(entity_t *entity)
 115 {
 116         if (inner_functions == NULL)
 117                 inner_functions = NEW_ARR_F(entity_t *, 0);
 118         ARR_APP1(entity_t*, inner_functions, entity);
 119 }
 120
 121 static ir_node *uninitialized_local_var(ir_graph *irg, ir_mode *mode, int pos)
 122 {
 123         const entity_t *entity = get_irg_loc_description(irg, pos);
 124
 125         if (entity != NULL) {
 126                 source_position_t const *const pos = &entity->base.source_position;
 127                 warningf(WARN_UNINITIALIZED, pos, "'%N' might be used uninitialized", entity);
 128         }
 129         return new_r_Unknown(irg, mode);
 130 }
 131
 132 static src_loc_t dbg_retrieve(const dbg_info *dbg)
 133 {
 134         source_position_t const *const pos = (source_position_t const*)dbg;
 135         if (pos) {
 136                 return (src_loc_t){ pos->input_name, pos->lineno, pos->colno };
 137         } else {
 138                 return (src_loc_t){ NULL, 0, 0 };
 139         }
 140 }
 141
 142 static dbg_info *get_dbg_info(const source_position_t *pos)
 143 {
 144         return (dbg_info*) pos;
 145 }
 146
 147 static void dbg_print_type_dbg_info(char *buffer, size_t buffer_size,
 148                                     const type_dbg_info *dbg)
 149 {
 150         assert(dbg != NULL);
 151         print_to_buffer(buffer, buffer_size);
 152         const type_t *type = (const type_t*) dbg;
 153         print_type(type);
 154         finish_print_to_buffer();
 155 }
 156
 157 static type_dbg_info *get_type_dbg_info_(const type_t *type)
 158 {
 159         return (type_dbg_info*) type;
 160 }
 161
 162 /* is the current block a reachable one? */
 163 static bool currently_reachable(void)
 164 {
 165         ir_node *const block = get_cur_block();
 166         return block != NULL && !is_Bad(block);
 167 }
 168
 169 static void set_unreachable_now(void)
 170 {
 171         set_cur_block(NULL);
 172 }
 173
 174 ir_mode *atomic_modes[ATOMIC_TYPE_LAST+1];
 175
 176 static ir_node *_expression_to_firm(const expression_t *expression);
 177 static ir_node *expression_to_firm(const expression_t *expression);
 178 static void create_local_declaration(entity_t *entity);
 179
 180 static unsigned decide_modulo_shift(unsigned type_size)
 181 {
 182         if (architecture_modulo_shift == 0)
 183                 return 0;
 184         if (type_size < architecture_modulo_shift)
 185                 return architecture_modulo_shift;
 186         return type_size;
 187 }
 188
 189 static ir_mode *init_atomic_ir_mode(atomic_type_kind_t kind)
 190 {
 191         unsigned flags = get_atomic_type_flags(kind);
 192         unsigned size  = get_atomic_type_size(kind);
 193         if ((flags & ATOMIC_TYPE_FLAG_FLOAT)
 194             && !(flags & ATOMIC_TYPE_FLAG_COMPLEX)) {
 195                 if (size == 4) {
 196                         return get_modeF();
 197                 } else if (size == 8) {
 198                         return get_modeD();
 199                 } else {
 200                         panic("unexpected kind");
 201                 }
 202         } else if (flags & ATOMIC_TYPE_FLAG_INTEGER) {
 203                 char            name[64];
 204                 unsigned        bit_size     = size * 8;
 205                 bool            is_signed    = (flags & ATOMIC_TYPE_FLAG_SIGNED) != 0;
 206                 unsigned        modulo_shift = decide_modulo_shift(bit_size);
 207
 208                 snprintf(name, sizeof(name), "%s%u", is_signed ? "I" : "U", bit_size);
 209                 return new_int_mode(name, irma_twos_complement, bit_size, is_signed,
 210                                     modulo_shift);
 211         }
 212
 213         return NULL;
 214 }
 215
 216 /**
 217  * Initialises the atomic modes depending on the machine size.
 218  */
 219 static void init_atomic_modes(void)
 220 {
 221         atomic_modes[ATOMIC_TYPE_VOID] = mode_ANY;
 222         for (int i = 0; i <= ATOMIC_TYPE_LAST; ++i) {
 223                 if (atomic_modes[i] != NULL)
 224                         continue;
 225                 atomic_modes[i] = init_atomic_ir_mode((atomic_type_kind_t) i);
 226         }
 227 }
 228
 229 ir_mode *get_atomic_mode(atomic_type_kind_t kind)
 230 {
 231         assert(kind <= ATOMIC_TYPE_LAST);
 232         return atomic_modes[kind];
 233 }
 234
 235 static ir_node *get_vla_size(array_type_t *const type)
 236 {
 237         ir_node *size_node = type->size_node;
 238         if (size_node == NULL) {
 239                 size_node = expression_to_firm(type->size_expression);
 240                 type->size_node = size_node;
 241         }
 242         return size_node;
 243 }
 244
 245 static unsigned count_parameters(const function_type_t *function_type)
 246 {
 247         unsigned count = 0;
 248
 249         function_parameter_t *parameter = function_type->parameters;
 250         for ( ; parameter != NULL; parameter = parameter->next) {
 251                 ++count;
 252         }
 253
 254         return count;
 255 }
 256
 257 /**
 258  * Creates a Firm type for an atomic type
 259  */
 260 static ir_type *create_atomic_type(atomic_type_kind_t akind, const type_t *type)
 261 {
 262         ir_mode        *mode      = atomic_modes[akind];
 263         type_dbg_info  *dbgi      = get_type_dbg_info_(type);
 264         ir_type        *irtype    = new_d_type_primitive(mode, dbgi);
 265         il_alignment_t  alignment = get_atomic_type_alignment(akind);
 266
 267         set_type_size_bytes(irtype, get_atomic_type_size(akind));
 268         set_type_alignment_bytes(irtype, alignment);
 269
 270         return irtype;
 271 }
 272
 273 /**
 274  * Creates a Firm type for a complex type
 275  */
 276 static ir_type *create_complex_type(const atomic_type_t *type)
 277 {
 278         atomic_type_kind_t  kind = type->akind;
 279         ir_mode            *mode = atomic_modes[kind];
 280         ident              *id   = get_mode_ident(mode);
 281
 282         (void) id;
 283
 284         /* FIXME: finish the array */
 285         return NULL;
 286 }
 287
 288 /**
 289  * Creates a Firm type for an imaginary type
 290  */
 291 static ir_type *create_imaginary_type(const atomic_type_t *type)
 292 {
 293         return create_atomic_type(type->akind, (const type_t*)type);
 294 }
 295
 296 /**
 297  * return type of a parameter (and take transparent union gnu extension into
 298  * account)
 299  */
 300 static type_t *get_parameter_type(type_t *orig_type)
 301 {
 302         type_t *type = skip_typeref(orig_type);
 303         if (is_type_union(type)
 304                         && get_type_modifiers(orig_type) & DM_TRANSPARENT_UNION) {
 305                 compound_t *compound = type->compound.compound;
 306                 type                 = compound->members.entities->declaration.type;
 307         }
 308
 309         return type;
 310 }
 311
 312 static ir_type *create_method_type(const function_type_t *function_type, bool for_closure)
 313 {
 314         type_t        *return_type  = skip_typeref(function_type->return_type);
 315
 316         int            n_parameters = count_parameters(function_type)
 317                                        + (for_closure ? 1 : 0);
 318         int            n_results    = is_type_void(return_type) ? 0 : 1;
 319         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) function_type);
 320         ir_type       *irtype       = new_d_type_method(n_parameters, n_results, dbgi);
 321
 322         if (!is_type_void(return_type)) {
 323                 ir_type *restype = get_ir_type(return_type);
 324                 set_method_res_type(irtype, 0, restype);
 325         }
 326
 327         function_parameter_t *parameter = function_type->parameters;
 328         int                   n         = 0;
 329         if (for_closure) {
 330                 ir_type *p_irtype = get_ir_type(type_void_ptr);
 331                 set_method_param_type(irtype, n, p_irtype);
 332                 ++n;
 333         }
 334         for ( ; parameter != NULL; parameter = parameter->next) {
 335                 type_t  *type     = get_parameter_type(parameter->type);
 336                 ir_type *p_irtype = get_ir_type(type);
 337                 set_method_param_type(irtype, n, p_irtype);
 338                 ++n;
 339         }
 340
 341         bool is_variadic = function_type->variadic;
 342
 343         if (is_variadic)
 344                 set_method_variadicity(irtype, variadicity_variadic);
 345
 346         unsigned cc = get_method_calling_convention(irtype);
 347         switch (function_type->calling_convention) {
 348         case CC_DEFAULT: /* unspecified calling convention, equal to one of the other, typically cdecl */
 349         case CC_CDECL:
 350 is_cdecl:
 351                 set_method_calling_convention(irtype, SET_CDECL(cc));
 352                 break;
 353
 354         case CC_STDCALL:
 355                 if (is_variadic)
 356                         goto is_cdecl;
 357
 358                 /* only non-variadic function can use stdcall, else use cdecl */
 359                 set_method_calling_convention(irtype, SET_STDCALL(cc));
 360                 break;
 361
 362         case CC_FASTCALL:
 363                 if (is_variadic)
 364                         goto is_cdecl;
 365                 /* only non-variadic function can use fastcall, else use cdecl */
 366                 set_method_calling_convention(irtype, SET_FASTCALL(cc));
 367                 break;
 368
 369         case CC_THISCALL:
 370                 /* Hmm, leave default, not accepted by the parser yet. */
 371                 break;
 372         }
 373
 374         if (for_closure)
 375                 set_method_calling_convention(irtype, get_method_calling_convention(irtype) | cc_this_call);
 376
 377         const decl_modifiers_t modifiers = function_type->modifiers;
 378         if (modifiers & DM_CONST)
 379                 add_method_additional_properties(irtype, mtp_property_const);
 380         if (modifiers & DM_PURE)
 381                 add_method_additional_properties(irtype, mtp_property_pure);
 382         if (modifiers & DM_RETURNS_TWICE)
 383                 add_method_additional_properties(irtype, mtp_property_returns_twice);
 384         if (modifiers & DM_NORETURN)
 385                 add_method_additional_properties(irtype, mtp_property_noreturn);
 386         if (modifiers & DM_NOTHROW)
 387                 add_method_additional_properties(irtype, mtp_property_nothrow);
 388         if (modifiers & DM_MALLOC)
 389                 add_method_additional_properties(irtype, mtp_property_malloc);
 390
 391         return irtype;
 392 }
 393
 394 static ir_type *create_pointer_type(pointer_type_t *type)
 395 {
 396         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) type);
 397         type_t        *points_to    = type->points_to;
 398         ir_type       *ir_points_to = get_ir_type_incomplete(points_to);
 399         ir_type       *irtype       = new_d_type_pointer(ir_points_to, dbgi);
 400
 401         return irtype;
 402 }
 403
 404 static ir_type *create_reference_type(reference_type_t *type)
 405 {
 406         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) type);
 407         type_t        *refers_to    = type->refers_to;
 408         ir_type       *ir_refers_to = get_ir_type_incomplete(refers_to);
 409         ir_type       *irtype       = new_d_type_pointer(ir_refers_to, dbgi);
 410
 411         return irtype;
 412 }
 413
 414 static ir_type *create_array_type(array_type_t *type)
 415 {
 416         type_dbg_info *dbgi            = get_type_dbg_info_((const type_t*) type);
 417         type_t        *element_type    = type->element_type;
 418         ir_type       *ir_element_type = get_ir_type(element_type);
 419         ir_type       *irtype          = new_d_type_array(1, ir_element_type, dbgi);
 420
 421         const int align = get_type_alignment_bytes(ir_element_type);
 422         set_type_alignment_bytes(irtype, align);
 423
 424         if (type->size_constant) {
 425                 int n_elements = type->size;
 426
 427                 set_array_bounds_int(irtype, 0, 0, n_elements);
 428
 429                 size_t elemsize = get_type_size_bytes(ir_element_type);
 430                 if (elemsize % align > 0) {
 431                         elemsize += align - (elemsize % align);
 432                 }
 433                 set_type_size_bytes(irtype, n_elements * elemsize);
 434         } else {
 435                 set_array_lower_bound_int(irtype, 0, 0);
 436         }
 437         set_type_state(irtype, layout_fixed);
 438
 439         return irtype;
 440 }
 441
 442 /**
 443  * Return the signed integer type of size bits.
 444  *
 445  * @param size   the size
 446  */
 447 static ir_type *get_signed_int_type_for_bit_size(ir_type *base_tp,
 448                                                  unsigned size,
 449                                                                                                  const type_t *type)
 450 {
 451         static ir_mode *s_modes[64 + 1] = {NULL, };
 452         ir_type *res;
 453         ir_mode *mode;
 454
 455         if (size <= 0 || size > 64)
 456                 return NULL;
 457
 458         mode = s_modes[size];
 459         if (mode == NULL) {
 460                 char name[32];
 461
 462                 snprintf(name, sizeof(name), "bf_I%u", size);
 463                 mode = new_int_mode(name, irma_twos_complement, size, 1, 0);
 464                 s_modes[size] = mode;
 465         }
 466
 467         type_dbg_info *dbgi = get_type_dbg_info_(type);
 468         res                 = new_d_type_primitive(mode, dbgi);
 469         set_primitive_base_type(res, base_tp);
 470
 471         return res;
 472 }
 473
 474 /**
 475  * Return the unsigned integer type of size bits.
 476  *
 477  * @param size   the size
 478  */
 479 static ir_type *get_unsigned_int_type_for_bit_size(ir_type *base_tp,
 480                                                    unsigned size,
 481                                                                                                    const type_t *type)
 482 {
 483         static ir_mode *u_modes[64 + 1] = {NULL, };
 484         ir_type *res;
 485         ir_mode *mode;
 486
 487         if (size <= 0 || size > 64)
 488                 return NULL;
 489
 490         mode = u_modes[size];
 491         if (mode == NULL) {
 492                 char name[32];
 493
 494                 snprintf(name, sizeof(name), "bf_U%u", size);
 495                 mode = new_int_mode(name, irma_twos_complement, size, 0, 0);
 496                 u_modes[size] = mode;
 497         }
 498
 499         type_dbg_info *dbgi = get_type_dbg_info_(type);
 500         res = new_d_type_primitive(mode, dbgi);
 501         set_primitive_base_type(res, base_tp);
 502
 503         return res;
 504 }
 505
 506 static ir_type *create_bitfield_type(const entity_t *entity)
 507 {
 508         assert(entity->kind == ENTITY_COMPOUND_MEMBER);
 509         type_t *base = skip_typeref(entity->declaration.type);
 510         assert(base->kind == TYPE_ATOMIC || base->kind == TYPE_ENUM);
 511         ir_type *irbase = get_ir_type(base);
 512
 513         unsigned bit_size = entity->compound_member.bit_size;
 514
 515         assert(!is_type_float(base));
 516         if (is_type_signed(base)) {
 517                 return get_signed_int_type_for_bit_size(irbase, bit_size, base);
 518         } else {
 519                 return get_unsigned_int_type_for_bit_size(irbase, bit_size, base);
 520         }
 521 }
 522
 523 enum {
 524         COMPOUND_IS_STRUCT = false,
 525         COMPOUND_IS_UNION  = true
 526 };
 527
 528 /**
 529  * Construct firm type from ast struct type.
 530  */
 531 static ir_type *create_compound_type(compound_type_t *type,
 532                                      bool incomplete, bool is_union)
 533 {
 534         compound_t *compound = type->compound;
 535
 536         if (compound->irtype != NULL && (compound->irtype_complete || incomplete)) {
 537                 return compound->irtype;
 538         }
 539
 540         symbol_t *type_symbol = compound->base.symbol;
 541         ident    *id;
 542         if (type_symbol != NULL) {
 543                 id = new_id_from_str(type_symbol->string);
 544         } else {
 545                 if (is_union) {
 546                         id = id_unique("__anonymous_union.%u");
 547                 } else {
 548                         id = id_unique("__anonymous_struct.%u");
 549                 }
 550         }
 551
 552         ir_type *irtype;
 553         if (is_union) {
 554                 irtype = new_type_union(id);
 555         } else {
 556                 irtype = new_type_struct(id);
 557         }
 558
 559         compound->irtype_complete = false;
 560         compound->irtype          = irtype;
 561
 562         if (incomplete)
 563                 return irtype;
 564
 565         if (is_union) {
 566                 layout_union_type(type);
 567         } else {
 568                 layout_struct_type(type);
 569         }
 570
 571         compound->irtype_complete = true;
 572
 573         entity_t *entry = compound->members.entities;
 574         for ( ; entry != NULL; entry = entry->base.next) {
 575                 if (entry->kind != ENTITY_COMPOUND_MEMBER)
 576                         continue;
 577
 578                 symbol_t *symbol     = entry->base.symbol;
 579                 type_t   *entry_type = entry->declaration.type;
 580                 ident    *ident;
 581                 if (symbol == NULL) {
 582                         /* anonymous bitfield member, skip */
 583                         if (entry->compound_member.bitfield)
 584                                 continue;
 585                         assert(entry_type->kind == TYPE_COMPOUND_STRUCT
 586                                         || entry_type->kind == TYPE_COMPOUND_UNION);
 587                         ident = id_unique("anon.%u");
 588                 } else {
 589                         ident = new_id_from_str(symbol->string);
 590                 }
 591
 592                 dbg_info *dbgi       = get_dbg_info(&entry->base.source_position);
 593
 594                 ir_type *entry_irtype;
 595                 if (entry->compound_member.bitfield) {
 596                         entry_irtype = create_bitfield_type(entry);
 597                 } else {
 598                         entry_irtype = get_ir_type(entry_type);
 599                 }
 600                 ir_entity *entity = new_d_entity(irtype, ident, entry_irtype, dbgi);
 601
 602                 set_entity_offset(entity, entry->compound_member.offset);
 603                 set_entity_offset_bits_remainder(entity,
 604                                                  entry->compound_member.bit_offset);
 605
 606                 assert(entry->declaration.kind == DECLARATION_KIND_UNKNOWN);
 607                 entry->declaration.kind       = DECLARATION_KIND_COMPOUND_MEMBER;
 608                 entry->compound_member.entity = entity;
 609         }
 610
 611         set_type_alignment_bytes(irtype, compound->alignment);
 612         set_type_size_bytes(irtype, compound->size);
 613         set_type_state(irtype, layout_fixed);
 614
 615         return irtype;
 616 }
 617
 618 static ir_tarval *fold_constant_to_tarval(expression_t const *);
 619
 620 static void determine_enum_values(enum_type_t *const type)
 621 {
 622         ir_mode   *const mode    = atomic_modes[type->base.akind];
 623         ir_tarval *const one     = get_mode_one(mode);
 624         ir_tarval *      tv_next = get_mode_null(mode);
 625
 626         enum_t   *enume = type->enume;
 627         entity_t *entry = enume->base.next;
 628         for (; entry != NULL; entry = entry->base.next) {
 629                 if (entry->kind != ENTITY_ENUM_VALUE)
 630                         break;
 631
 632                 expression_t *const init = entry->enum_value.value;
 633                 if (init != NULL) {
 634                         tv_next = fold_constant_to_tarval(init);
 635                 }
 636                 assert(entry->enum_value.tv == NULL || entry->enum_value.tv == tv_next);
 637                 entry->enum_value.tv = tv_next;
 638                 tv_next = tarval_add(tv_next, one);
 639         }
 640 }
 641
 642 static ir_type *create_enum_type(enum_type_t *const type)
 643 {
 644         return create_atomic_type(type->base.akind, (const type_t*) type);
 645 }
 646
 647 static ir_type *get_ir_type_incomplete(type_t *type)
 648 {
 649         assert(type != NULL);
 650         type = skip_typeref(type);
 651
 652         if (type->base.firm_type != NULL) {
 653                 return type->base.firm_type;
 654         }
 655
 656         switch (type->kind) {
 657         case TYPE_COMPOUND_STRUCT:
 658                 return create_compound_type(&type->compound, true, COMPOUND_IS_STRUCT);
 659         case TYPE_COMPOUND_UNION:
 660                 return create_compound_type(&type->compound, true, COMPOUND_IS_UNION);
 661         default:
 662                 return get_ir_type(type);
 663         }
 664 }
 665
 666 ir_type *get_ir_type(type_t *type)
 667 {
 668         assert(type != NULL);
 669
 670         type = skip_typeref(type);
 671
 672         if (type->base.firm_type != NULL) {
 673                 return type->base.firm_type;
 674         }
 675
 676         ir_type *firm_type = NULL;
 677         switch (type->kind) {
 678         case TYPE_ATOMIC:
 679                 firm_type = create_atomic_type(type->atomic.akind, type);
 680                 break;
 681         case TYPE_COMPLEX:
 682                 firm_type = create_complex_type(&type->atomic);
 683                 break;
 684         case TYPE_IMAGINARY:
 685                 firm_type = create_imaginary_type(&type->atomic);
 686                 break;
 687         case TYPE_FUNCTION:
 688                 firm_type = create_method_type(&type->function, false);
 689                 break;
 690         case TYPE_POINTER:
 691                 firm_type = create_pointer_type(&type->pointer);
 692                 break;
 693         case TYPE_REFERENCE:
 694                 firm_type = create_reference_type(&type->reference);
 695                 break;
 696         case TYPE_ARRAY:
 697                 firm_type = create_array_type(&type->array);
 698                 break;
 699         case TYPE_COMPOUND_STRUCT:
 700                 firm_type = create_compound_type(&type->compound, false, COMPOUND_IS_STRUCT);
 701                 break;
 702         case TYPE_COMPOUND_UNION:
 703                 firm_type = create_compound_type(&type->compound, false, COMPOUND_IS_UNION);
 704                 break;
 705         case TYPE_ENUM:
 706                 firm_type = create_enum_type(&type->enumt);
 707                 break;
 708
 709         case TYPE_ERROR:
 710         case TYPE_TYPEOF:
 711         case TYPE_TYPEDEF:
 712                 break;
 713         }
 714         if (firm_type == NULL)
 715                 panic("unknown type found");
 716
 717         type->base.firm_type = firm_type;
 718         return firm_type;
 719 }
 720
 721 static ir_mode *get_ir_mode_storage(type_t *type)
 722 {
 723         type = skip_typeref(type);
 724
 725         /* Firm doesn't report a mode for arrays and structs/unions. */
 726         if (!is_type_scalar(type)) {
 727                 return mode_P_data;
 728         }
 729
 730         ir_type *const irtype = get_ir_type(type);
 731         ir_mode *const mode   = get_type_mode(irtype);
 732         assert(mode != NULL);
 733         return mode;
 734 }
 735
 736 /*
 737  * get arithmetic mode for a type. This is different from get_ir_mode_storage,
 738  * int that it returns bigger modes for floating point on some platforms
 739  * (x87 internally does arithemtic with 80bits)
 740  */
 741 static ir_mode *get_ir_mode_arithmetic(type_t *type)
 742 {
 743         ir_mode *mode = get_ir_mode_storage(type);
 744         if (mode_is_float(mode) && mode_float_arithmetic != NULL) {
 745                 return mode_float_arithmetic;
 746         }
 747
 748         return mode;
 749 }
 750
 751 /**
 752  * Return a node representing the size of a type.
 753  */
 754 static ir_node *get_type_size_node(type_t *type)
 755 {
 756         unsigned size;
 757         ir_mode *mode = get_ir_mode_arithmetic(type_size_t);
 758         type = skip_typeref(type);
 759
 760         if (is_type_array(type) && type->array.is_vla) {
 761                 ir_node *size_node = get_vla_size(&type->array);
 762                 ir_node *elem_size = get_type_size_node(type->array.element_type);
 763                 ir_node *real_size = new_d_Mul(NULL, size_node, elem_size, mode);
 764                 return real_size;
 765         }
 766
 767         size = get_type_size(type);
 768         return new_Const_long(mode, size);
 769 }
 770
 771 /** Names of the runtime functions. */
 772 static const struct {
 773         int        id;           /**< the rts id */
 774         int        n_res;        /**< number of return values */
 775         const char *name;        /**< the name of the rts function */
 776         int        n_params;     /**< number of parameters */
 777         unsigned   flags;        /**< language flags */
 778 } rts_data[] = {
 779         { rts_debugbreak, 0, "__debugbreak", 0, _MS },
 780         { rts_abort,      0, "abort",        0, _C89 },
 781         { rts_alloca,     1, "alloca",       1, _ALL },
 782         { rts_abs,        1, "abs",          1, _C89 },
 783         { rts_labs,       1, "labs",         1, _C89 },
 784         { rts_llabs,      1, "llabs",        1, _C99 },
 785         { rts_imaxabs,    1, "imaxabs",      1, _C99 },
 786
 787         { rts_fabs,       1, "fabs",         1, _C89 },
 788         { rts_sqrt,       1, "sqrt",         1, _C89 },
 789         { rts_cbrt,       1, "cbrt",         1, _C99 },
 790         { rts_exp,        1, "exp",          1, _C89 },
 791         { rts_exp2,       1, "exp2",         1, _C89 },
 792         { rts_exp10,      1, "exp10",        1, _GNUC },
 793         { rts_log,        1, "log",          1, _C89 },
 794         { rts_log2,       1, "log2",         1, _C89 },
 795         { rts_log10,      1, "log10",        1, _C89 },
 796         { rts_pow,        1, "pow",          2, _C89 },
 797         { rts_sin,        1, "sin",          1, _C89 },
 798         { rts_cos,        1, "cos",          1, _C89 },
 799         { rts_tan,        1, "tan",          1, _C89 },
 800         { rts_asin,       1, "asin",         1, _C89 },
 801         { rts_acos,       1, "acos",         1, _C89 },
 802         { rts_atan,       1, "atan",         1, _C89 },
 803         { rts_sinh,       1, "sinh",         1, _C89 },
 804         { rts_cosh,       1, "cosh",         1, _C89 },
 805         { rts_tanh,       1, "tanh",         1, _C89 },
 806
 807         { rts_fabsf,      1, "fabsf",        1, _C99 },
 808         { rts_sqrtf,      1, "sqrtf",        1, _C99 },
 809         { rts_cbrtf,      1, "cbrtf",        1, _C99 },
 810         { rts_expf,       1, "expf",         1, _C99 },
 811         { rts_exp2f,      1, "exp2f",        1, _C99 },
 812         { rts_exp10f,     1, "exp10f",       1, _GNUC },
 813         { rts_logf,       1, "logf",         1, _C99 },
 814         { rts_log2f,      1, "log2f",        1, _C99 },
 815         { rts_log10f,     1, "log10f",       1, _C99 },
 816         { rts_powf,       1, "powf",         2, _C99 },
 817         { rts_sinf,       1, "sinf",         1, _C99 },
 818         { rts_cosf,       1, "cosf",         1, _C99 },
 819         { rts_tanf,       1, "tanf",         1, _C99 },
 820         { rts_asinf,      1, "asinf",        1, _C99 },
 821         { rts_acosf,      1, "acosf",        1, _C99 },
 822         { rts_atanf,      1, "atanf",        1, _C99 },
 823         { rts_sinhf,      1, "sinhf",        1, _C99 },
 824         { rts_coshf,      1, "coshf",        1, _C99 },
 825         { rts_tanhf,      1, "tanhf",        1, _C99 },
 826
 827         { rts_fabsl,      1, "fabsl",        1, _C99 },
 828         { rts_sqrtl,      1, "sqrtl",        1, _C99 },
 829         { rts_cbrtl,      1, "cbrtl",        1, _C99 },
 830         { rts_expl,       1, "expl",         1, _C99 },
 831         { rts_exp2l,      1, "exp2l",        1, _C99 },
 832         { rts_exp10l,     1, "exp10l",       1, _GNUC },
 833         { rts_logl,       1, "logl",         1, _C99 },
 834         { rts_log2l,      1, "log2l",        1, _C99 },
 835         { rts_log10l,     1, "log10l",       1, _C99 },
 836         { rts_powl,       1, "powl",         2, _C99 },
 837         { rts_sinl,       1, "sinl",         1, _C99 },
 838         { rts_cosl,       1, "cosl",         1, _C99 },
 839         { rts_tanl,       1, "tanl",         1, _C99 },
 840         { rts_asinl,      1, "asinl",        1, _C99 },
 841         { rts_acosl,      1, "acosl",        1, _C99 },
 842         { rts_atanl,      1, "atanl",        1, _C99 },
 843         { rts_sinhl,      1, "sinhl",        1, _C99 },
 844         { rts_coshl,      1, "coshl",        1, _C99 },
 845         { rts_tanhl,      1, "tanhl",        1, _C99 },
 846
 847         { rts_strcmp,     1, "strcmp",       2, _C89 },
 848         { rts_strncmp,    1, "strncmp",      3, _C89 },
 849         { rts_strcpy,     1, "strcpy",       2, _C89 },
 850         { rts_strlen,     1, "strlen",       1, _C89 },
 851         { rts_memcpy,     1, "memcpy",       3, _C89 },
 852         { rts_mempcpy,    1, "mempcpy",      3, _GNUC },
 853         { rts_memmove,    1, "memmove",      3, _C89 },
 854         { rts_memset,     1, "memset",       3, _C89 },
 855         { rts_memcmp,     1, "memcmp",       3, _C89 },
 856 };
 857
 858 static ident *rts_idents[lengthof(rts_data)];
 859
 860 static create_ld_ident_func create_ld_ident = create_name_linux_elf;
 861
 862 void set_create_ld_ident(ident *(*func)(entity_t*))
 863 {
 864         create_ld_ident = func;
 865 }
 866
 867 /**
 868  * Handle GNU attributes for entities
 869  *
 870  * @param ent   the entity
 871  * @param decl  the routine declaration
 872  */
 873 static void handle_decl_modifiers(ir_entity *irentity, entity_t *entity)
 874 {
 875         assert(is_declaration(entity));
 876         decl_modifiers_t modifiers = entity->declaration.modifiers;
 877
 878         if (is_method_entity(irentity)) {
 879                 if (modifiers & DM_PURE) {
 880                         set_entity_additional_properties(irentity, mtp_property_pure);
 881                 }
 882                 if (modifiers & DM_CONST) {
 883                         add_entity_additional_properties(irentity, mtp_property_const);
 884                 }
 885         }
 886         if (modifiers & DM_USED) {
 887                 add_entity_linkage(irentity, IR_LINKAGE_HIDDEN_USER);
 888         }
 889         if (modifiers & DM_WEAK) {
 890                 add_entity_linkage(irentity, IR_LINKAGE_WEAK);
 891         }
 892 }
 893
 894 static bool is_main(entity_t *entity)
 895 {
 896         static symbol_t *sym_main = NULL;
 897         if (sym_main == NULL) {
 898                 sym_main = symbol_table_insert("main");
 899         }
 900
 901         if (entity->base.symbol != sym_main)
 902                 return false;
 903         /* must be in outermost scope */
 904         if (entity->base.parent_scope != &current_translation_unit->scope)
 905                 return false;
 906
 907         return true;
 908 }
 909
 910 /**
 911  * Creates an entity representing a function.
 912  *
 913  * @param entity       the function declaration/definition
 914  * @param owner_type   the owner type of this function, NULL
 915  *                     for global functions
 916  */
 917 static ir_entity *get_function_entity(entity_t *entity, ir_type *owner_type)
 918 {
 919         assert(entity->kind == ENTITY_FUNCTION);
 920         if (entity->function.irentity != NULL)
 921                 return entity->function.irentity;
 922
 923         switch (entity->function.btk) {
 924         case BUILTIN_NONE:
 925         case BUILTIN_LIBC:
 926         case BUILTIN_LIBC_CHECK:
 927                 break;
 928         default:
 929                 return NULL;
 930         }
 931
 932         if (is_main(entity)) {
 933                 /* force main to C linkage */
 934                 type_t *type = entity->declaration.type;
 935                 assert(is_type_function(type));
 936                 if (type->function.linkage != LINKAGE_C) {
 937                         type_t *new_type           = duplicate_type(type);
 938                         new_type->function.linkage = LINKAGE_C;
 939                         type                       = identify_new_type(new_type);
 940                         entity->declaration.type   = type;
 941                 }
 942         }
 943
 944         symbol_t *symbol = entity->base.symbol;
 945         ident    *id     = new_id_from_str(symbol->string);
 946
 947         /* already an entity defined? */
 948         ir_entity *irentity = entitymap_get(&entitymap, symbol);
 949         bool const has_body = entity->function.statement != NULL;
 950         if (irentity != NULL) {
 951                 if (get_entity_visibility(irentity) == ir_visibility_external
 952                                 && has_body) {
 953                         set_entity_visibility(irentity, ir_visibility_default);
 954                 }
 955                 goto entity_created;
 956         }
 957
 958         ir_type *ir_type_method;
 959         if (entity->function.need_closure)
 960                 ir_type_method = create_method_type(&entity->declaration.type->function, true);
 961         else
 962                 ir_type_method = get_ir_type(entity->declaration.type);
 963
 964         bool nested_function = false;
 965         if (owner_type == NULL)
 966                 owner_type = get_glob_type();
 967         else
 968                 nested_function = true;
 969
 970         dbg_info *const dbgi = get_dbg_info(&entity->base.source_position);
 971         irentity = new_d_entity(owner_type, id, ir_type_method, dbgi);
 972
 973         ident *ld_id;
 974         if (nested_function)
 975                 ld_id = id_unique("inner.%u");
 976         else
 977                 ld_id = create_ld_ident(entity);
 978         set_entity_ld_ident(irentity, ld_id);
 979
 980         handle_decl_modifiers(irentity, entity);
 981
 982         if (! nested_function) {
 983                 /* static inline             => local
 984                  * extern inline             => local
 985                  * inline without definition => local
 986                  * inline with definition    => external_visible */
 987                 storage_class_tag_t const storage_class
 988                         = (storage_class_tag_t) entity->declaration.storage_class;
 989                 bool                const is_inline     = entity->function.is_inline;
 990
 991                 if (is_inline && storage_class == STORAGE_CLASS_NONE && has_body) {
 992                     set_entity_visibility(irentity, ir_visibility_default);
 993                 } else if (storage_class == STORAGE_CLASS_STATIC ||
 994                            (is_inline && has_body)) {
 995                     set_entity_visibility(irentity, ir_visibility_local);
 996                 } else if (has_body) {
 997                     set_entity_visibility(irentity, ir_visibility_default);
 998                 } else {
 999                     set_entity_visibility(irentity, ir_visibility_external);
1000                 }
1001         } else {
1002                 /* nested functions are always local */
1003                 set_entity_visibility(irentity, ir_visibility_local);
1004         }
1005
1006         /* We should check for file scope here, but as long as we compile C only
1007            this is not needed. */
1008         if (!freestanding && !has_body) {
1009                 /* check for a known runtime function */
1010                 for (size_t i = 0; i < lengthof(rts_data); ++i) {
1011                         if (id != rts_idents[i])
1012                                 continue;
1013
1014                         function_type_t *function_type
1015                                 = &entity->declaration.type->function;
1016                         /* rts_entities code can't handle a "wrong" number of parameters */
1017                         if (function_type->unspecified_parameters)
1018                                 continue;
1019
1020                         /* check number of parameters */
1021                         int n_params = count_parameters(function_type);
1022                         if (n_params != rts_data[i].n_params)
1023                                 continue;
1024
1025                         type_t *return_type = skip_typeref(function_type->return_type);
1026                         int     n_res       = is_type_void(return_type) ? 0 : 1;
1027                         if (n_res != rts_data[i].n_res)
1028                                 continue;
1029
1030                         /* ignore those rts functions not necessary needed for current mode */
1031                         if ((c_mode & rts_data[i].flags) == 0)
1032                                 continue;
1033                         assert(rts_entities[rts_data[i].id] == NULL);
1034                         rts_entities[rts_data[i].id] = irentity;
1035                 }
1036         }
1037
1038         entitymap_insert(&entitymap, symbol, irentity);
1039
1040 entity_created:
1041         entity->declaration.kind  = DECLARATION_KIND_FUNCTION;
1042         entity->function.irentity = irentity;
1043
1044         return irentity;
1045 }
1046
1047 /**
1048  * Creates a SymConst for a given entity.
1049  *
1050  * @param dbgi    debug info
1051  * @param entity  the entity
1052  */
1053 static ir_node *create_symconst(dbg_info *dbgi, ir_entity *entity)
1054 {
1055         assert(entity != NULL);
1056         union symconst_symbol sym;
1057         sym.entity_p = entity;
1058         return new_d_SymConst(dbgi, mode_P, sym, symconst_addr_ent);
1059 }
1060
1061 static ir_node *create_Const_from_bool(ir_mode *const mode, bool const v)
1062 {
1063         return new_Const((v ? get_mode_one : get_mode_null)(mode));
1064 }
1065
1066 static ir_node *create_conv_from_b(dbg_info *dbgi, ir_node *value,
1067                                    ir_mode *dest_mode)
1068 {
1069         if (is_Const(value)) {
1070                 return create_Const_from_bool(dest_mode, !is_Const_null(value));
1071         }
1072
1073         ir_node *cond       = new_d_Cond(dbgi, value);
1074         ir_node *proj_true  = new_Proj(cond, mode_X, pn_Cond_true);
1075         ir_node *proj_false = new_Proj(cond, mode_X, pn_Cond_false);
1076         ir_node *tblock     = new_Block(1, &proj_true);
1077         ir_node *fblock     = new_Block(1, &proj_false);
1078         set_cur_block(tblock);
1079         ir_node *const1 = new_Const(get_mode_one(dest_mode));
1080         ir_node *tjump  = new_Jmp();
1081         set_cur_block(fblock);
1082         ir_node *const0 = new_Const(get_mode_null(dest_mode));
1083         ir_node *fjump  = new_Jmp();
1084
1085         ir_node *in[2]      = { tjump, fjump };
1086         ir_node *mergeblock = new_Block(2, in);
1087         set_cur_block(mergeblock);
1088         ir_node *phi_in[2]  = { const1, const0 };
1089         ir_node *phi        = new_Phi(2, phi_in, dest_mode);
1090         return phi;
1091 }
1092
1093 static ir_node *create_conv(dbg_info *dbgi, ir_node *value, ir_mode *dest_mode)
1094 {
1095         ir_mode *value_mode = get_irn_mode(value);
1096
1097         if (value_mode == dest_mode)
1098                 return value;
1099
1100         if (dest_mode == mode_b) {
1101                 ir_node *zero = new_Const(get_mode_null(value_mode));
1102                 ir_node *cmp  = new_d_Cmp(dbgi, value, zero, ir_relation_unordered_less_greater);
1103                 return cmp;
1104         } else if (value_mode == mode_b) {
1105                 return create_conv_from_b(dbgi, value, dest_mode);
1106         }
1107
1108         return new_d_Conv(dbgi, value, dest_mode);
1109 }
1110
1111 /**
1112  * Creates a SymConst node representing a wide string literal.
1113  *
1114  * @param literal   the wide string literal
1115  */
1116 static ir_node *wide_string_literal_to_firm(
1117                 const string_literal_expression_t *literal)
1118 {
1119         ir_type  *const global_type = get_glob_type();
1120         ir_type  *const elem_type   = ir_type_wchar_t;
1121         dbg_info *const dbgi        = get_dbg_info(&literal->base.source_position);
1122         ir_type  *const type        = new_type_array(1, elem_type);
1123
1124         ident     *const id     = id_unique("str.%u");
1125         ir_entity *const entity = new_d_entity(global_type, id, type, dbgi);
1126         set_entity_ld_ident(entity, id);
1127         set_entity_visibility(entity, ir_visibility_private);
1128         add_entity_linkage(entity, IR_LINKAGE_CONSTANT);
1129
1130         ir_mode      *const mode = get_type_mode(elem_type);
1131         const size_t        slen = wstrlen(&literal->value);
1132
1133         set_array_lower_bound_int(type, 0, 0);
1134         set_array_upper_bound_int(type, 0, slen);
1135         set_type_size_bytes(type, slen * get_mode_size_bytes(mode));
1136         set_type_state(type, layout_fixed);
1137
1138         ir_initializer_t *initializer = create_initializer_compound(slen);
1139         const char              *p    = literal->value.begin;
1140         for (size_t i = 0; i < slen; ++i) {
1141                 assert(p < literal->value.begin + literal->value.size);
1142                 utf32             v   = read_utf8_char(&p);
1143                 ir_tarval        *tv  = new_tarval_from_long(v, mode);
1144                 ir_initializer_t *val = create_initializer_tarval(tv);
1145                 set_initializer_compound_value(initializer, i, val);
1146         }
1147         set_entity_initializer(entity, initializer);
1148
1149         return create_symconst(dbgi, entity);
1150 }
1151
1152 /**
1153  * Creates a SymConst node representing a string constant.
1154  *
1155  * @param src_pos    the source position of the string constant
1156  * @param id_prefix  a prefix for the name of the generated string constant
1157  * @param value      the value of the string constant
1158  */
1159 static ir_node *string_to_firm(const source_position_t *const src_pos,
1160                                const char *const id_prefix,
1161                                const string_t *const value)
1162 {
1163         ir_type  *const global_type = get_glob_type();
1164         dbg_info *const dbgi        = get_dbg_info(src_pos);
1165         ir_type  *const type        = new_type_array(1, ir_type_const_char);
1166
1167         ident     *const id     = id_unique(id_prefix);
1168         ir_entity *const entity = new_d_entity(global_type, id, type, dbgi);
1169         set_entity_ld_ident(entity, id);
1170         set_entity_visibility(entity, ir_visibility_private);
1171         add_entity_linkage(entity, IR_LINKAGE_CONSTANT);
1172
1173         ir_type *const elem_type = ir_type_const_char;
1174         ir_mode *const mode      = get_type_mode(elem_type);
1175
1176         const char* const string = value->begin;
1177         const size_t      slen   = value->size;
1178
1179         set_array_lower_bound_int(type, 0, 0);
1180         set_array_upper_bound_int(type, 0, slen);
1181         set_type_size_bytes(type, slen);
1182         set_type_state(type, layout_fixed);
1183
1184         ir_initializer_t *initializer = create_initializer_compound(slen);
1185         for (size_t i = 0; i < slen; ++i) {
1186                 ir_tarval        *tv  = new_tarval_from_long(string[i], mode);
1187                 ir_initializer_t *val = create_initializer_tarval(tv);
1188                 set_initializer_compound_value(initializer, i, val);
1189         }
1190         set_entity_initializer(entity, initializer);
1191
1192         return create_symconst(dbgi, entity);
1193 }
1194
1195 static bool try_create_integer(literal_expression_t *literal,
1196                                type_t *type, unsigned char base)
1197 {
1198         const char *string = literal->value.begin;
1199         size_t      size   = literal->value.size;
1200
1201         assert(type->kind == TYPE_ATOMIC);
1202         atomic_type_kind_t akind = type->atomic.akind;
1203
1204         ir_mode   *mode = atomic_modes[akind];
1205         ir_tarval *tv   = new_integer_tarval_from_str(string, size, 1, base, mode);
1206         if (tv == tarval_bad)
1207                 return false;
1208
1209         literal->base.type    = type;
1210         literal->target_value = tv;
1211         return true;
1212 }
1213
1214 static void create_integer_tarval(literal_expression_t *literal)
1215 {
1216         unsigned        us     = 0;
1217         unsigned        ls     = 0;
1218         const string_t *suffix = &literal->suffix;
1219         /* parse suffix */
1220         if (suffix->size > 0) {
1221                 for (const char *c = suffix->begin; *c != '\0'; ++c) {
1222                         if (*c == 'u' || *c == 'U') { ++us; }
1223                         if (*c == 'l' || *c == 'L') { ++ls; }
1224                 }
1225         }
1226
1227         unsigned base;
1228         switch (literal->base.kind) {
1229                 case EXPR_LITERAL_INTEGER_OCTAL:       base =  8; break;
1230                 case EXPR_LITERAL_INTEGER:             base = 10; break;
1231                 case EXPR_LITERAL_INTEGER_HEXADECIMAL: base = 16; break;
1232                 default: panic("invalid literal kind");
1233         }
1234
1235         tarval_int_overflow_mode_t old_mode = tarval_get_integer_overflow_mode();
1236
1237         /* now try if the constant is small enough for some types */
1238         tarval_set_integer_overflow_mode(TV_OVERFLOW_BAD);
1239         if (ls < 1) {
1240                 if (us == 0 && try_create_integer(literal, type_int, base))
1241                         goto finished;
1242                 if ((us == 1 || base != 10)
1243                                 && try_create_integer(literal, type_unsigned_int, base))
1244                         goto finished;
1245         }
1246         if (ls < 2) {
1247                 if (us == 0 && try_create_integer(literal, type_long, base))
1248                         goto finished;
1249                 if ((us == 1 || base != 10)
1250                                 && try_create_integer(literal, type_unsigned_long, base))
1251                         goto finished;
1252         }
1253         /* last try? then we should not report tarval_bad */
1254         if (us != 1 && base == 10)
1255                 tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
1256         if (us == 0 && try_create_integer(literal, type_long_long, base))
1257                 goto finished;
1258
1259         /* last try */
1260         assert(us == 1 || base != 10);
1261         tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
1262         bool res = try_create_integer(literal, type_unsigned_long_long, base);
1263         if (!res)
1264                 panic("internal error when parsing number literal");
1265
1266 finished:
1267         tarval_set_integer_overflow_mode(old_mode);
1268 }
1269
1270 void determine_literal_type(literal_expression_t *literal)
1271 {
1272         switch (literal->base.kind) {
1273         case EXPR_LITERAL_INTEGER:
1274         case EXPR_LITERAL_INTEGER_OCTAL:
1275         case EXPR_LITERAL_INTEGER_HEXADECIMAL:
1276                 create_integer_tarval(literal);
1277                 return;
1278         default:
1279                 break;
1280         }
1281 }
1282
1283 /**
1284  * Creates a Const node representing a constant.
1285  */
1286 static ir_node *literal_to_firm(const literal_expression_t *literal)
1287 {
1288         type_t     *type   = skip_typeref(literal->base.type);
1289         ir_mode    *mode   = get_ir_mode_storage(type);
1290         const char *string = literal->value.begin;
1291         size_t      size   = literal->value.size;
1292         ir_tarval  *tv;
1293
1294         switch (literal->base.kind) {
1295         case EXPR_LITERAL_WIDE_CHARACTER: {
1296                 utf32  v = read_utf8_char(&string);
1297                 char   buf[128];
1298                 size_t len = snprintf(buf, sizeof(buf), UTF32_PRINTF_FORMAT, v);
1299
1300                 tv = new_tarval_from_str(buf, len, mode);
1301                 goto make_const;
1302         }
1303         case EXPR_LITERAL_CHARACTER: {
1304                 long long int v;
1305                 bool char_is_signed
1306                         = get_atomic_type_flags(ATOMIC_TYPE_CHAR) & ATOMIC_TYPE_FLAG_SIGNED;
1307                 if (size == 1 && char_is_signed) {
1308                         v = (signed char)string[0];
1309                 } else {
1310                         v = 0;
1311                         for (size_t i = 0; i < size; ++i) {
1312                                 v = (v << 8) | ((unsigned char)string[i]);
1313                         }
1314                 }
1315                 char   buf[128];
1316                 size_t len = snprintf(buf, sizeof(buf), "%lld", v);
1317
1318                 tv = new_tarval_from_str(buf, len, mode);
1319                 goto make_const;
1320         }
1321         case EXPR_LITERAL_INTEGER:
1322         case EXPR_LITERAL_INTEGER_OCTAL:
1323         case EXPR_LITERAL_INTEGER_HEXADECIMAL:
1324                 assert(literal->target_value != NULL);
1325                 tv = literal->target_value;
1326                 goto make_const;
1327         case EXPR_LITERAL_FLOATINGPOINT:
1328                 tv = new_tarval_from_str(string, size, mode);
1329                 goto make_const;
1330         case EXPR_LITERAL_FLOATINGPOINT_HEXADECIMAL: {
1331                 char buffer[size + 2];
1332                 memcpy(buffer, "0x", 2);
1333                 memcpy(buffer+2, string, size);
1334                 tv = new_tarval_from_str(buffer, size+2, mode);
1335                 goto make_const;
1336         }
1337         case EXPR_LITERAL_BOOLEAN:
1338                 if (string[0] == 't') {
1339                         tv = get_mode_one(mode);
1340                 } else {
1341                         assert(string[0] == 'f');
1342                         tv = get_mode_null(mode);
1343                 }
1344                 goto make_const;
1345         case EXPR_LITERAL_MS_NOOP:
1346                 tv = get_mode_null(mode);
1347                 goto make_const;
1348         default:
1349                 break;
1350         }
1351         panic("Invalid literal kind found");
1352
1353 make_const: ;
1354         dbg_info *dbgi       = get_dbg_info(&literal->base.source_position);
1355         ir_node  *res        = new_d_Const(dbgi, tv);
1356         ir_mode  *mode_arith = get_ir_mode_arithmetic(type);
1357         return create_conv(dbgi, res, mode_arith);
1358 }
1359
1360 /*
1361  * Allocate an area of size bytes aligned at alignment
1362  * at a frame type.
1363  */
1364 static ir_entity *alloc_trampoline(ir_type *frame_type, int size, unsigned alignment)
1365 {
1366         static unsigned area_cnt = 0;
1367         char buf[32];
1368
1369         ir_type *tp = new_type_array(1, ir_type_char);
1370         set_array_bounds_int(tp, 0, 0, size);
1371         set_type_alignment_bytes(tp, alignment);
1372
1373         snprintf(buf, sizeof(buf), "trampolin%u", area_cnt++);
1374         ident *name = new_id_from_str(buf);
1375         ir_entity *area = new_entity(frame_type, name, tp);
1376
1377         /* mark this entity as compiler generated */
1378         set_entity_compiler_generated(area, 1);
1379         return area;
1380 }
1381
1382 /**
1383  * Return a node representing a trampoline region
1384  * for a given function entity.
1385  *
1386  * @param dbgi    debug info
1387  * @param entity  the function entity
1388  */
1389 static ir_node *get_trampoline_region(dbg_info *dbgi, ir_entity *entity)
1390 {
1391         ir_entity *region = NULL;
1392         int        i;
1393
1394         if (current_trampolines != NULL) {
1395                 for (i = ARR_LEN(current_trampolines) - 1; i >= 0; --i) {
1396                         if (current_trampolines[i].function == entity) {
1397                                 region = current_trampolines[i].region;
1398                                 break;
1399                         }
1400                 }
1401         } else {
1402                 current_trampolines = NEW_ARR_F(trampoline_region, 0);
1403         }
1404         ir_graph *irg = current_ir_graph;
1405         if (region == NULL) {
1406                 /* create a new region */
1407                 ir_type           *frame_tp = get_irg_frame_type(irg);
1408                 trampoline_region  reg;
1409                 reg.function = entity;
1410
1411                 reg.region   = alloc_trampoline(frame_tp,
1412                                                 be_params->trampoline_size,
1413                                                 be_params->trampoline_align);
1414                 ARR_APP1(trampoline_region, current_trampolines, reg);
1415                 region = reg.region;
1416         }
1417         return new_d_simpleSel(dbgi, get_irg_no_mem(irg), get_irg_frame(irg),
1418                                region);
1419 }
1420
1421 /**
1422  * Creates a trampoline for a function represented by an entity.
1423  *
1424  * @param dbgi    debug info
1425  * @param mode    the (reference) mode for the function address
1426  * @param entity  the function entity
1427  */
1428 static ir_node *create_trampoline(dbg_info *dbgi, ir_mode *mode,
1429                                   ir_entity *entity)
1430 {
1431         assert(entity != NULL);
1432         ir_node *in[3];
1433         in[0] = get_trampoline_region(dbgi, entity);
1434         in[1] = create_symconst(dbgi, entity);
1435         in[2] = get_irg_frame(current_ir_graph);
1436
1437         ir_node *irn = new_d_Builtin(dbgi, get_store(), 3, in, ir_bk_inner_trampoline, get_unknown_type());
1438         set_store(new_Proj(irn, mode_M, pn_Builtin_M));
1439         return new_Proj(irn, mode, pn_Builtin_max+1);
1440 }
1441
1442 /**
1443  * Dereference an address.
1444  *
1445  * @param dbgi  debug info
1446  * @param type  the type of the dereferenced result (the points_to type)
1447  * @param addr  the address to dereference
1448  */
1449 static ir_node *deref_address(dbg_info *const dbgi, type_t *const type,
1450                                       ir_node *const addr)
1451 {
1452         type_t *skipped = skip_typeref(type);
1453         if (is_type_incomplete(skipped))
1454                 return addr;
1455
1456         ir_type *irtype = get_ir_type(skipped);
1457         if (is_compound_type(irtype)
1458             || is_Method_type(irtype)
1459             || is_Array_type(irtype)) {
1460                 return addr;
1461         }
1462
1463         ir_cons_flags  flags    = skipped->base.qualifiers & TYPE_QUALIFIER_VOLATILE
1464                                   ? cons_volatile : cons_none;
1465         ir_mode *const mode     = get_type_mode(irtype);
1466         ir_node *const memory   = get_store();
1467         ir_node *const load     = new_d_Load(dbgi, memory, addr, mode, flags);
1468         ir_node *const load_mem = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1469         ir_node *const load_res = new_d_Proj(dbgi, load, mode,   pn_Load_res);
1470
1471         set_store(load_mem);
1472
1473         ir_mode *const mode_arithmetic = get_ir_mode_arithmetic(skipped);
1474         return create_conv(dbgi, load_res, mode_arithmetic);
1475 }
1476
1477 /**
1478  * Creates a strict Conv (to the node's mode) if necessary.
1479  *
1480  * @param dbgi  debug info
1481  * @param node  the node to strict conv
1482  */
1483 static ir_node *do_strict_conv(dbg_info *dbgi, ir_node *node)
1484 {
1485         ir_mode *mode = get_irn_mode(node);
1486
1487         if (!(get_irg_fp_model(current_ir_graph) & fp_explicit_rounding))
1488                 return node;
1489         if (!mode_is_float(mode))
1490                 return node;
1491
1492         /* check if there is already a Conv */
1493         if (is_Conv(node)) {
1494                 /* convert it into a strict Conv */
1495                 set_Conv_strict(node, 1);
1496                 return node;
1497         }
1498
1499         /* otherwise create a new one */
1500         return new_d_strictConv(dbgi, node, mode);
1501 }
1502
1503 /**
1504  * Returns the correct base address depending on whether it is a parameter or a
1505  * normal local variable.
1506  */
1507 static ir_node *get_local_frame(ir_entity *const ent)
1508 {
1509         ir_graph      *const irg   = current_ir_graph;
1510         const ir_type *const owner = get_entity_owner(ent);
1511         if (owner == current_outer_frame) {
1512                 assert(current_static_link != NULL);
1513                 return current_static_link;
1514         } else {
1515                 return get_irg_frame(irg);
1516         }
1517 }
1518
1519 /**
1520  * Keep all memory edges of the given block.
1521  */
1522 static void keep_all_memory(ir_node *block)
1523 {
1524         ir_node *old = get_cur_block();
1525
1526         set_cur_block(block);
1527         keep_alive(get_store());
1528         /* TODO: keep all memory edges from restricted pointers */
1529         set_cur_block(old);
1530 }
1531
1532 static ir_node *enum_constant_to_firm(reference_expression_t const *const ref)
1533 {
1534         entity_t *entity = ref->entity;
1535         if (entity->enum_value.tv == NULL) {
1536                 type_t *type = skip_typeref(entity->enum_value.enum_type);
1537                 assert(type->kind == TYPE_ENUM);
1538                 determine_enum_values(&type->enumt);
1539         }
1540
1541         return new_Const(entity->enum_value.tv);
1542 }
1543
1544 static ir_node *reference_expression_to_firm(const reference_expression_t *ref)
1545 {
1546         dbg_info *dbgi   = get_dbg_info(&ref->base.source_position);
1547         entity_t *entity = ref->entity;
1548         assert(is_declaration(entity));
1549         type_t   *type   = skip_typeref(entity->declaration.type);
1550
1551         /* make sure the type is constructed */
1552         (void) get_ir_type(type);
1553
1554         if (entity->kind == ENTITY_FUNCTION
1555             && entity->function.btk != BUILTIN_NONE) {
1556                 ir_entity *irentity = get_function_entity(entity, NULL);
1557                 /* for gcc compatibility we have to produce (dummy) addresses for some
1558                  * builtins which don't have entities */
1559                 if (irentity == NULL) {
1560                         source_position_t const *const pos = &ref->base.source_position;
1561                         symbol_t          const *const sym = ref->entity->base.symbol;
1562                         warningf(WARN_OTHER, pos, "taking address of builtin '%Y'", sym);
1563
1564                         /* simply create a NULL pointer */
1565                         ir_mode  *mode = get_ir_mode_arithmetic(type_void_ptr);
1566                         ir_node  *res  = new_Const(get_mode_null(mode));
1567
1568                         return res;
1569                 }
1570         }
1571
1572         switch ((declaration_kind_t) entity->declaration.kind) {
1573         case DECLARATION_KIND_UNKNOWN:
1574                 break;
1575
1576         case DECLARATION_KIND_LOCAL_VARIABLE: {
1577                 ir_mode *const mode  = get_ir_mode_storage(type);
1578                 ir_node *const value = get_value(entity->variable.v.value_number, mode);
1579                 return create_conv(NULL, value, get_ir_mode_arithmetic(type));
1580         }
1581         case DECLARATION_KIND_PARAMETER: {
1582                 ir_mode *const mode  = get_ir_mode_storage(type);
1583                 ir_node *const value = get_value(entity->parameter.v.value_number,mode);
1584                 return create_conv(NULL, value, get_ir_mode_arithmetic(type));
1585         }
1586         case DECLARATION_KIND_FUNCTION: {
1587                 return create_symconst(dbgi, entity->function.irentity);
1588         }
1589         case DECLARATION_KIND_INNER_FUNCTION: {
1590                 ir_mode *const mode = get_ir_mode_storage(type);
1591                 if (!entity->function.goto_to_outer && !entity->function.need_closure) {
1592                         /* inner function not using the closure */
1593                         return create_symconst(dbgi, entity->function.irentity);
1594                 } else {
1595                         /* need trampoline here */
1596                         return create_trampoline(dbgi, mode, entity->function.irentity);
1597                 }
1598         }
1599         case DECLARATION_KIND_GLOBAL_VARIABLE: {
1600                 const variable_t *variable = &entity->variable;
1601                 ir_node *const addr = create_symconst(dbgi, variable->v.entity);
1602                 return deref_address(dbgi, variable->base.type, addr);
1603         }
1604
1605         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY: {
1606                 ir_entity *irentity = entity->variable.v.entity;
1607                 ir_node   *frame    = get_local_frame(irentity);
1608                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1609                 return deref_address(dbgi, entity->declaration.type, sel);
1610         }
1611         case DECLARATION_KIND_PARAMETER_ENTITY: {
1612                 ir_entity *irentity = entity->parameter.v.entity;
1613                 ir_node   *frame    = get_local_frame(irentity);
1614                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1615                 return deref_address(dbgi, entity->declaration.type, sel);
1616         }
1617
1618         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
1619                 return entity->variable.v.vla_base;
1620
1621         case DECLARATION_KIND_COMPOUND_MEMBER:
1622                 panic("not implemented reference type");
1623         }
1624
1625         panic("reference to declaration with unknown type found");
1626 }
1627
1628 static ir_node *reference_addr(const reference_expression_t *ref)
1629 {
1630         dbg_info *dbgi   = get_dbg_info(&ref->base.source_position);
1631         entity_t *entity = ref->entity;
1632         assert(is_declaration(entity));
1633
1634         switch((declaration_kind_t) entity->declaration.kind) {
1635         case DECLARATION_KIND_UNKNOWN:
1636                 break;
1637         case DECLARATION_KIND_PARAMETER:
1638         case DECLARATION_KIND_LOCAL_VARIABLE:
1639                 /* you can store to a local variable (so we don't panic but return NULL
1640                  * as an indicator for no real address) */
1641                 return NULL;
1642         case DECLARATION_KIND_GLOBAL_VARIABLE: {
1643                 ir_node *const addr = create_symconst(dbgi, entity->variable.v.entity);
1644                 return addr;
1645         }
1646         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY: {
1647                 ir_entity *irentity = entity->variable.v.entity;
1648                 ir_node   *frame    = get_local_frame(irentity);
1649                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1650
1651                 return sel;
1652         }
1653         case DECLARATION_KIND_PARAMETER_ENTITY: {
1654                 ir_entity *irentity = entity->parameter.v.entity;
1655                 ir_node   *frame    = get_local_frame(irentity);
1656                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1657
1658                 return sel;
1659         }
1660
1661         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
1662                 return entity->variable.v.vla_base;
1663
1664         case DECLARATION_KIND_FUNCTION: {
1665                 return create_symconst(dbgi, entity->function.irentity);
1666         }
1667
1668         case DECLARATION_KIND_INNER_FUNCTION: {
1669                 type_t  *const type = skip_typeref(entity->declaration.type);
1670                 ir_mode *const mode = get_ir_mode_storage(type);
1671                 if (!entity->function.goto_to_outer && !entity->function.need_closure) {
1672                         /* inner function not using the closure */
1673                         return create_symconst(dbgi, entity->function.irentity);
1674                 } else {
1675                         /* need trampoline here */
1676                         return create_trampoline(dbgi, mode, entity->function.irentity);
1677                 }
1678         }
1679
1680         case DECLARATION_KIND_COMPOUND_MEMBER:
1681                 panic("not implemented reference type");
1682         }
1683
1684         panic("reference to declaration with unknown type found");
1685 }
1686
1687 /**
1688  * Transform calls to builtin functions.
1689  */
1690 static ir_node *process_builtin_call(const call_expression_t *call)
1691 {
1692         dbg_info *dbgi = get_dbg_info(&call->base.source_position);
1693
1694         assert(call->function->kind == EXPR_REFERENCE);
1695         reference_expression_t *builtin = &call->function->reference;
1696
1697         type_t *expr_type = skip_typeref(builtin->base.type);
1698         assert(is_type_pointer(expr_type));
1699
1700         type_t *function_type = skip_typeref(expr_type->pointer.points_to);
1701
1702         switch (builtin->entity->function.btk) {
1703         case BUILTIN_NONE:
1704                 break;
1705         case BUILTIN_ALLOCA: {
1706                 expression_t *argument = call->arguments->expression;
1707                 ir_node      *size     = expression_to_firm(argument);
1708
1709                 ir_node *store  = get_store();
1710                 ir_node *alloca = new_d_Alloc(dbgi, store, size, get_unknown_type(),
1711                                               stack_alloc);
1712                 ir_node *proj_m = new_Proj(alloca, mode_M, pn_Alloc_M);
1713                 set_store(proj_m);
1714                 ir_node *res    = new_Proj(alloca, mode_P_data, pn_Alloc_res);
1715
1716                 return res;
1717         }
1718         case BUILTIN_INF: {
1719                 type_t    *type = function_type->function.return_type;
1720                 ir_mode   *mode = get_ir_mode_arithmetic(type);
1721                 ir_tarval *tv   = get_mode_infinite(mode);
1722                 ir_node   *res  = new_d_Const(dbgi, tv);
1723                 return res;
1724         }
1725         case BUILTIN_NAN: {
1726                 /* Ignore string for now... */
1727                 assert(is_type_function(function_type));
1728                 type_t    *type = function_type->function.return_type;
1729                 ir_mode   *mode = get_ir_mode_arithmetic(type);
1730                 ir_tarval *tv   = get_mode_NAN(mode);
1731                 ir_node   *res  = new_d_Const(dbgi, tv);
1732                 return res;
1733         }
1734         case BUILTIN_EXPECT: {
1735                 expression_t *argument = call->arguments->expression;
1736                 return _expression_to_firm(argument);
1737         }
1738         case BUILTIN_VA_END:
1739                 /* evaluate the argument of va_end for its side effects */
1740                 _expression_to_firm(call->arguments->expression);
1741                 return NULL;
1742         case BUILTIN_OBJECT_SIZE: {
1743                 /* determine value of "type" */
1744                 expression_t *type_expression = call->arguments->next->expression;
1745                 long          type_val        = fold_constant_to_int(type_expression);
1746                 type_t       *type            = function_type->function.return_type;
1747                 ir_mode      *mode            = get_ir_mode_arithmetic(type);
1748                 /* just produce a "I don't know" result */
1749                 ir_tarval    *result          = type_val & 2 ? get_mode_null(mode) :
1750                                                 get_mode_minus_one(mode);
1751
1752                 return new_d_Const(dbgi, result);
1753         }
1754         case BUILTIN_ROTL: {
1755                 ir_node *val  = expression_to_firm(call->arguments->expression);
1756                 ir_node *shf  = expression_to_firm(call->arguments->next->expression);
1757                 ir_mode *mode = get_irn_mode(val);
1758                 ir_mode *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1759                 return new_d_Rotl(dbgi, val, create_conv(dbgi, shf, mode_uint), mode);
1760         }
1761         case BUILTIN_ROTR: {
1762                 ir_node *val  = expression_to_firm(call->arguments->expression);
1763                 ir_node *shf  = expression_to_firm(call->arguments->next->expression);
1764                 ir_mode *mode = get_irn_mode(val);
1765                 ir_mode *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1766                 ir_node *c    = new_Const_long(mode_uint, get_mode_size_bits(mode));
1767                 ir_node *sub  = new_d_Sub(dbgi, c, create_conv(dbgi, shf, mode_uint), mode_uint);
1768                 return new_d_Rotl(dbgi, val, sub, mode);
1769         }
1770         case BUILTIN_FIRM:
1771                 break;
1772         case BUILTIN_LIBC:
1773         case BUILTIN_LIBC_CHECK:
1774                 panic("builtin did not produce an entity");
1775         }
1776         panic("invalid builtin found");
1777 }
1778
1779 /**
1780  * Transform a call expression.
1781  * Handles some special cases, like alloca() calls, which must be resolved
1782  * BEFORE the inlines runs. Inlining routines calling alloca() is dangerous,
1783  * 176.gcc for instance might allocate 2GB instead of 256 MB if alloca is not
1784  * handled right...
1785  */
1786 static ir_node *call_expression_to_firm(const call_expression_t *const call)
1787 {
1788         dbg_info *const dbgi = get_dbg_info(&call->base.source_position);
1789         assert(currently_reachable());
1790
1791         expression_t   *function = call->function;
1792         ir_node        *callee   = NULL;
1793         bool            firm_builtin = false;
1794         ir_builtin_kind firm_builtin_kind = ir_bk_trap;
1795         if (function->kind == EXPR_REFERENCE) {
1796                 const reference_expression_t *ref    = &function->reference;
1797                 entity_t                     *entity = ref->entity;
1798
1799                 if (entity->kind == ENTITY_FUNCTION) {
1800                         builtin_kind_t builtin = entity->function.btk;
1801                         if (builtin == BUILTIN_FIRM) {
1802                                 firm_builtin = true;
1803                                 firm_builtin_kind = entity->function.b.firm_builtin_kind;
1804                         } else if (builtin != BUILTIN_NONE && builtin != BUILTIN_LIBC
1805                                    && builtin != BUILTIN_LIBC_CHECK) {
1806                                 return process_builtin_call(call);
1807                         }
1808                 }
1809         }
1810         if (!firm_builtin)
1811                 callee = expression_to_firm(function);
1812
1813         type_t *type = skip_typeref(function->base.type);
1814         assert(is_type_pointer(type));
1815         pointer_type_t *pointer_type = &type->pointer;
1816         type_t         *points_to    = skip_typeref(pointer_type->points_to);
1817         assert(is_type_function(points_to));
1818         function_type_t *function_type = &points_to->function;
1819
1820         int      n_parameters    = 0;
1821         ir_type *ir_method_type  = get_ir_type((type_t*) function_type);
1822         ir_type *new_method_type = NULL;
1823         if (function_type->variadic || function_type->unspecified_parameters) {
1824                 const call_argument_t *argument = call->arguments;
1825                 for ( ; argument != NULL; argument = argument->next) {
1826                         ++n_parameters;
1827                 }
1828
1829                 /* we need to construct a new method type matching the call
1830                  * arguments... */
1831                 type_dbg_info *tdbgi = get_type_dbg_info_((const type_t*) function_type);
1832                 int n_res       = get_method_n_ress(ir_method_type);
1833                 new_method_type = new_d_type_method(n_parameters, n_res, tdbgi);
1834                 set_method_calling_convention(new_method_type,
1835                                get_method_calling_convention(ir_method_type));
1836                 set_method_additional_properties(new_method_type,
1837                                get_method_additional_properties(ir_method_type));
1838                 set_method_variadicity(new_method_type,
1839                                        get_method_variadicity(ir_method_type));
1840
1841                 for (int i = 0; i < n_res; ++i) {
1842                         set_method_res_type(new_method_type, i,
1843                                             get_method_res_type(ir_method_type, i));
1844                 }
1845                 argument = call->arguments;
1846                 for (int i = 0; i < n_parameters; ++i, argument = argument->next) {
1847                         expression_t *expression = argument->expression;
1848                         ir_type      *irtype     = get_ir_type(expression->base.type);
1849                         set_method_param_type(new_method_type, i, irtype);
1850                 }
1851                 ir_method_type = new_method_type;
1852         } else {
1853                 n_parameters = get_method_n_params(ir_method_type);
1854         }
1855
1856         ir_node *in[n_parameters];
1857
1858         const call_argument_t *argument = call->arguments;
1859         for (int n = 0; n < n_parameters; ++n) {
1860                 expression_t *expression = argument->expression;
1861                 ir_node      *arg_node   = expression_to_firm(expression);
1862
1863                 type_t *arg_type = skip_typeref(expression->base.type);
1864                 if (!is_type_compound(arg_type)) {
1865                         ir_mode *mode = get_ir_mode_storage(expression->base.type);
1866                         arg_node      = create_conv(dbgi, arg_node, mode);
1867                         arg_node      = do_strict_conv(dbgi, arg_node);
1868                 }
1869
1870                 in[n] = arg_node;
1871
1872                 argument = argument->next;
1873         }
1874
1875         ir_node *store;
1876         if (function_type->modifiers & DM_CONST) {
1877                 store = get_irg_no_mem(current_ir_graph);
1878         } else {
1879                 store = get_store();
1880         }
1881
1882         ir_node *node;
1883         type_t  *return_type = skip_typeref(function_type->return_type);
1884         ir_node *result      = NULL;
1885         if (firm_builtin) {
1886                 node = new_d_Builtin(dbgi, store, n_parameters, in, firm_builtin_kind,
1887                                      ir_method_type);
1888                 if (! (function_type->modifiers & DM_CONST)) {
1889                         ir_node *mem = new_Proj(node, mode_M, pn_Builtin_M);
1890                         set_store(mem);
1891                 }
1892
1893                 if (!is_type_void(return_type)) {
1894                         assert(is_type_scalar(return_type));
1895                         ir_mode *mode = get_ir_mode_storage(return_type);
1896                         result = new_Proj(node, mode, pn_Builtin_max+1);
1897                         ir_mode *mode_arith = get_ir_mode_arithmetic(return_type);
1898                         result              = create_conv(NULL, result, mode_arith);
1899                 }
1900         } else {
1901                 node = new_d_Call(dbgi, store, callee, n_parameters, in, ir_method_type);
1902                 if (! (function_type->modifiers & DM_CONST)) {
1903                         ir_node *mem = new_Proj(node, mode_M, pn_Call_M);
1904                         set_store(mem);
1905                 }
1906
1907                 if (!is_type_void(return_type)) {
1908                         ir_node *const resproj    = new_Proj(node, mode_T, pn_Call_T_result);
1909                         ir_mode *const mode       = get_ir_mode_storage(return_type);
1910                         result                    = new_Proj(resproj, mode, 0);
1911                         ir_mode *const mode_arith = get_ir_mode_arithmetic(return_type);
1912                         result                    = create_conv(NULL, result, mode_arith);
1913                 }
1914         }
1915
1916         if (function_type->modifiers & DM_NORETURN) {
1917                 /* A dead end:  Keep the Call and the Block.  Also place all further
1918                  * nodes into a new and unreachable block. */
1919                 keep_alive(node);
1920                 keep_alive(get_cur_block());
1921                 ir_node *block = new_Block(0, NULL);
1922                 set_cur_block(block);
1923         }
1924
1925         return result;
1926 }
1927
1928 static ir_node *statement_to_firm(statement_t *statement);
1929 static ir_node *compound_statement_to_firm(compound_statement_t *compound);
1930
1931 static ir_node *expression_to_addr(const expression_t *expression);
1932 static ir_node *create_condition_evaluation(const expression_t *expression,
1933                                             ir_node *true_block,
1934                                             ir_node *false_block);
1935
1936 static void assign_value(dbg_info *dbgi, ir_node *addr, type_t *type,
1937                          ir_node *value)
1938 {
1939         if (!is_type_compound(type)) {
1940                 ir_mode *mode = get_ir_mode_storage(type);
1941                 value         = create_conv(dbgi, value, mode);
1942                 value         = do_strict_conv(dbgi, value);
1943         }
1944
1945         ir_node *memory = get_store();
1946
1947         if (is_type_scalar(type)) {
1948                 ir_cons_flags flags = type->base.qualifiers & TYPE_QUALIFIER_VOLATILE
1949                                       ? cons_volatile : cons_none;
1950                 ir_node  *store     = new_d_Store(dbgi, memory, addr, value, flags);
1951                 ir_node  *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
1952                 set_store(store_mem);
1953         } else {
1954                 ir_type *irtype    = get_ir_type(type);
1955                 ir_node *copyb     = new_d_CopyB(dbgi, memory, addr, value, irtype);
1956                 ir_node *copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
1957                 set_store(copyb_mem);
1958         }
1959 }
1960
1961 static ir_tarval *create_bitfield_mask(ir_mode *mode, int offset, int size)
1962 {
1963         ir_tarval *all_one   = get_mode_all_one(mode);
1964         int        mode_size = get_mode_size_bits(mode);
1965         ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1966
1967         assert(offset >= 0);
1968         assert(size   >= 0);
1969         assert(offset + size <= mode_size);
1970         if (size == mode_size) {
1971                 return all_one;
1972         }
1973
1974         long       shiftr    = get_mode_size_bits(mode) - size;
1975         long       shiftl    = offset;
1976         ir_tarval *tv_shiftr = new_tarval_from_long(shiftr, mode_uint);
1977         ir_tarval *tv_shiftl = new_tarval_from_long(shiftl, mode_uint);
1978         ir_tarval *mask0     = tarval_shr(all_one, tv_shiftr);
1979         ir_tarval *mask1     = tarval_shl(mask0, tv_shiftl);
1980
1981         return mask1;
1982 }
1983
1984 static ir_node *bitfield_store_to_firm(dbg_info *dbgi,
1985                 ir_entity *entity, ir_node *addr, ir_node *value, bool set_volatile,
1986                 bool need_return)
1987 {
1988         ir_type *entity_type = get_entity_type(entity);
1989         ir_type *base_type   = get_primitive_base_type(entity_type);
1990         ir_mode *mode        = get_type_mode(base_type);
1991         ir_mode *mode_uint   = atomic_modes[ATOMIC_TYPE_UINT];
1992
1993         value = create_conv(dbgi, value, mode);
1994
1995         /* kill upper bits of value and shift to right position */
1996         unsigned  bitoffset  = get_entity_offset_bits_remainder(entity);
1997         unsigned  bitsize    = get_mode_size_bits(get_type_mode(entity_type));
1998         unsigned  base_bits  = get_mode_size_bits(mode);
1999         unsigned  shiftwidth = base_bits - bitsize;
2000
2001         ir_node  *shiftcount = new_Const_long(mode_uint, shiftwidth);
2002         ir_node  *shiftl     = new_d_Shl(dbgi, value, shiftcount, mode);
2003
2004         unsigned  shrwidth   = base_bits - bitsize - bitoffset;
2005         ir_node  *shrconst   = new_Const_long(mode_uint, shrwidth);
2006         ir_node  *shiftr     = new_d_Shr(dbgi, shiftl, shrconst, mode);
2007
2008         /* load current value */
2009         ir_node   *mem             = get_store();
2010         ir_node   *load            = new_d_Load(dbgi, mem, addr, mode,
2011                                           set_volatile ? cons_volatile : cons_none);
2012         ir_node   *load_mem        = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
2013         ir_node   *load_res        = new_d_Proj(dbgi, load, mode, pn_Load_res);
2014         ir_tarval *shift_mask      = create_bitfield_mask(mode, bitoffset, bitsize);
2015         ir_tarval *inv_mask        = tarval_not(shift_mask);
2016         ir_node   *inv_mask_node   = new_d_Const(dbgi, inv_mask);
2017         ir_node   *load_res_masked = new_d_And(dbgi, load_res, inv_mask_node, mode);
2018
2019         /* construct new value and store */
2020         ir_node *new_val   = new_d_Or(dbgi, load_res_masked, shiftr, mode);
2021         ir_node *store     = new_d_Store(dbgi, load_mem, addr, new_val,
2022                                          set_volatile ? cons_volatile : cons_none);
2023         ir_node *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
2024         set_store(store_mem);
2025
2026         if (!need_return)
2027                 return NULL;
2028
2029         ir_node *res_shr;
2030         ir_node *count_res_shr = new_Const_long(mode_uint, base_bits - bitsize);
2031         if (mode_is_signed(mode)) {
2032                 res_shr = new_d_Shrs(dbgi, shiftl, count_res_shr, mode);
2033         } else {
2034                 res_shr = new_d_Shr(dbgi, shiftl, count_res_shr, mode);
2035         }
2036         return res_shr;
2037 }
2038
2039 static ir_node *bitfield_extract_to_firm(const select_expression_t *expression,
2040                                          ir_node *addr)
2041 {
2042         dbg_info *dbgi      = get_dbg_info(&expression->base.source_position);
2043         entity_t *entity    = expression->compound_entry;
2044         type_t   *base_type = entity->declaration.type;
2045         ir_mode  *mode      = get_ir_mode_storage(base_type);
2046         ir_node  *mem       = get_store();
2047         ir_node  *load      = new_d_Load(dbgi, mem, addr, mode, cons_none);
2048         ir_node  *load_mem  = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
2049         ir_node  *load_res  = new_d_Proj(dbgi, load, mode, pn_Load_res);
2050         ir_mode  *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
2051
2052         ir_mode  *amode     = mode;
2053         /* optimisation, since shifting in modes < machine_size is usually
2054          * less efficient */
2055         if (get_mode_size_bits(amode) < get_mode_size_bits(mode_uint)) {
2056                 amode = mode_uint;
2057         }
2058         unsigned amode_size = get_mode_size_bits(amode);
2059         load_res = create_conv(dbgi, load_res, amode);
2060
2061         set_store(load_mem);
2062
2063         /* kill upper bits */
2064         assert(expression->compound_entry->kind == ENTITY_COMPOUND_MEMBER);
2065         unsigned   bitoffset   = entity->compound_member.bit_offset;
2066         unsigned   bitsize     = entity->compound_member.bit_size;
2067         unsigned   shift_bitsl = amode_size - bitoffset - bitsize;
2068         ir_tarval *tvl         = new_tarval_from_long((long)shift_bitsl, mode_uint);
2069         ir_node   *countl      = new_d_Const(dbgi, tvl);
2070         ir_node   *shiftl      = new_d_Shl(dbgi, load_res, countl, amode);
2071
2072         unsigned   shift_bitsr = bitoffset + shift_bitsl;
2073         assert(shift_bitsr <= amode_size);
2074         ir_tarval *tvr         = new_tarval_from_long((long)shift_bitsr, mode_uint);
2075         ir_node   *countr      = new_d_Const(dbgi, tvr);
2076         ir_node   *shiftr;
2077         if (mode_is_signed(mode)) {
2078                 shiftr = new_d_Shrs(dbgi, shiftl, countr, amode);
2079         } else {
2080                 shiftr = new_d_Shr(dbgi, shiftl, countr, amode);
2081         }
2082
2083         type_t  *type    = expression->base.type;
2084         ir_mode *resmode = get_ir_mode_arithmetic(type);
2085         return create_conv(dbgi, shiftr, resmode);
2086 }
2087
2088 /* make sure the selected compound type is constructed */
2089 static void construct_select_compound(const select_expression_t *expression)
2090 {
2091         type_t *type = skip_typeref(expression->compound->base.type);
2092         if (is_type_pointer(type)) {
2093                 type = type->pointer.points_to;
2094         }
2095         (void) get_ir_type(type);
2096 }
2097
2098 static ir_node *set_value_for_expression_addr(const expression_t *expression,
2099                                               ir_node *value, ir_node *addr)
2100 {
2101         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2102         type_t   *type = skip_typeref(expression->base.type);
2103
2104         if (!is_type_compound(type)) {
2105                 ir_mode  *mode = get_ir_mode_storage(type);
2106                 value          = create_conv(dbgi, value, mode);
2107                 value          = do_strict_conv(dbgi, value);
2108         }
2109
2110         if (expression->kind == EXPR_REFERENCE) {
2111                 const reference_expression_t *ref = &expression->reference;
2112
2113                 entity_t *entity = ref->entity;
2114                 assert(is_declaration(entity));
2115                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2116                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE) {
2117                         set_value(entity->variable.v.value_number, value);
2118                         return value;
2119                 } else if (entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
2120                         set_value(entity->parameter.v.value_number, value);
2121                         return value;
2122                 }
2123         }
2124
2125         if (addr == NULL)
2126                 addr = expression_to_addr(expression);
2127         assert(addr != NULL);
2128
2129         if (expression->kind == EXPR_SELECT) {
2130                 const select_expression_t *select = &expression->select;
2131
2132                 construct_select_compound(select);
2133
2134                 entity_t *entity = select->compound_entry;
2135                 assert(entity->kind == ENTITY_COMPOUND_MEMBER);
2136                 if (entity->compound_member.bitfield) {
2137                         ir_entity *irentity = entity->compound_member.entity;
2138                         bool       set_volatile
2139                                 = select->base.type->base.qualifiers & TYPE_QUALIFIER_VOLATILE;
2140                         value = bitfield_store_to_firm(dbgi, irentity, addr, value,
2141                                                        set_volatile, true);
2142                         return value;
2143                 }
2144         }
2145
2146         assign_value(dbgi, addr, type, value);
2147         return value;
2148 }
2149
2150 static void set_value_for_expression(const expression_t *expression,
2151                                      ir_node *value)
2152 {
2153         set_value_for_expression_addr(expression, value, NULL);
2154 }
2155
2156 static ir_node *get_value_from_lvalue(const expression_t *expression,
2157                                       ir_node *addr)
2158 {
2159         if (expression->kind == EXPR_REFERENCE) {
2160                 const reference_expression_t *ref = &expression->reference;
2161
2162                 entity_t *entity = ref->entity;
2163                 assert(entity->kind == ENTITY_VARIABLE
2164                                 || entity->kind == ENTITY_PARAMETER);
2165                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2166                 int value_number;
2167                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE) {
2168                         value_number = entity->variable.v.value_number;
2169                         assert(addr == NULL);
2170                         type_t  *type = skip_typeref(expression->base.type);
2171                         ir_mode *mode = get_ir_mode_storage(type);
2172                         ir_node *res  = get_value(value_number, mode);
2173                         return create_conv(NULL, res, get_ir_mode_arithmetic(type));
2174                 } else if (entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
2175                         value_number = entity->parameter.v.value_number;
2176                         assert(addr == NULL);
2177                         type_t  *type = skip_typeref(expression->base.type);
2178                         ir_mode *mode = get_ir_mode_storage(type);
2179                         ir_node *res  = get_value(value_number, mode);
2180                         return create_conv(NULL, res, get_ir_mode_arithmetic(type));
2181                 }
2182         }
2183
2184         assert(addr != NULL);
2185         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2186
2187         ir_node *value;
2188         if (expression->kind == EXPR_SELECT &&
2189             expression->select.compound_entry->compound_member.bitfield) {
2190             construct_select_compound(&expression->select);
2191                 value = bitfield_extract_to_firm(&expression->select, addr);
2192         } else {
2193                 value = deref_address(dbgi, expression->base.type, addr);
2194         }
2195
2196         return value;
2197 }
2198
2199
2200 static ir_node *create_incdec(const unary_expression_t *expression)
2201 {
2202         dbg_info *const     dbgi = get_dbg_info(&expression->base.source_position);
2203         const expression_t *value_expr = expression->value;
2204         ir_node            *addr       = expression_to_addr(value_expr);
2205         ir_node            *value      = get_value_from_lvalue(value_expr, addr);
2206
2207         type_t  *type = skip_typeref(expression->base.type);
2208         ir_mode *mode = get_ir_mode_arithmetic(expression->base.type);
2209
2210         ir_node *offset;
2211         if (is_type_pointer(type)) {
2212                 pointer_type_t *pointer_type = &type->pointer;
2213                 offset = get_type_size_node(pointer_type->points_to);
2214         } else {
2215                 assert(is_type_arithmetic(type));
2216                 offset = new_Const(get_mode_one(mode));
2217         }
2218
2219         ir_node *result;
2220         ir_node *store_value;
2221         switch(expression->base.kind) {
2222         case EXPR_UNARY_POSTFIX_INCREMENT:
2223                 result      = value;
2224                 store_value = new_d_Add(dbgi, value, offset, mode);
2225                 break;
2226         case EXPR_UNARY_POSTFIX_DECREMENT:
2227                 result      = value;
2228                 store_value = new_d_Sub(dbgi, value, offset, mode);
2229                 break;
2230         case EXPR_UNARY_PREFIX_INCREMENT:
2231                 result      = new_d_Add(dbgi, value, offset, mode);
2232                 store_value = result;
2233                 break;
2234         case EXPR_UNARY_PREFIX_DECREMENT:
2235                 result      = new_d_Sub(dbgi, value, offset, mode);
2236                 store_value = result;
2237                 break;
2238         default:
2239                 panic("no incdec expr in create_incdec");
2240         }
2241
2242         set_value_for_expression_addr(value_expr, store_value, addr);
2243
2244         return result;
2245 }
2246
2247 static bool is_local_variable(expression_t *expression)
2248 {
2249         if (expression->kind != EXPR_REFERENCE)
2250                 return false;
2251         reference_expression_t *ref_expr = &expression->reference;
2252         entity_t               *entity   = ref_expr->entity;
2253         if (entity->kind != ENTITY_VARIABLE)
2254                 return false;
2255         assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2256         return entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE;
2257 }
2258
2259 static ir_relation get_relation(const expression_kind_t kind)
2260 {
2261         switch(kind) {
2262         case EXPR_BINARY_EQUAL:         return ir_relation_equal;
2263         case EXPR_BINARY_ISLESSGREATER: return ir_relation_less_greater;
2264         case EXPR_BINARY_NOTEQUAL:      return ir_relation_unordered_less_greater;
2265         case EXPR_BINARY_ISLESS:
2266         case EXPR_BINARY_LESS:          return ir_relation_less;
2267         case EXPR_BINARY_ISLESSEQUAL:
2268         case EXPR_BINARY_LESSEQUAL:     return ir_relation_less_equal;
2269         case EXPR_BINARY_ISGREATER:
2270         case EXPR_BINARY_GREATER:       return ir_relation_greater;
2271         case EXPR_BINARY_ISGREATEREQUAL:
2272         case EXPR_BINARY_GREATEREQUAL:  return ir_relation_greater_equal;
2273         case EXPR_BINARY_ISUNORDERED:   return ir_relation_unordered;
2274
2275         default:
2276                 break;
2277         }
2278         panic("trying to get pn_Cmp from non-comparison binexpr type");
2279 }
2280
2281 /**
2282  * Handle the assume optimizer hint: check if a Confirm
2283  * node can be created.
2284  *
2285  * @param dbi    debug info
2286  * @param expr   the IL assume expression
2287  *
2288  * we support here only some simple cases:
2289  *  - var rel const
2290  *  - const rel val
2291  *  - var rel var
2292  */
2293 static ir_node *handle_assume_compare(dbg_info *dbi,
2294                                       const binary_expression_t *expression)
2295 {
2296         expression_t *op1 = expression->left;
2297         expression_t *op2 = expression->right;
2298         entity_t     *var2, *var = NULL;
2299         ir_node      *res      = NULL;
2300         ir_relation   relation = get_relation(expression->base.kind);
2301
2302         if (is_local_variable(op1) && is_local_variable(op2)) {
2303                 var  = op1->reference.entity;
2304             var2 = op2->reference.entity;
2305
2306                 type_t  *const type = skip_typeref(var->declaration.type);
2307                 ir_mode *const mode = get_ir_mode_storage(type);
2308
2309                 ir_node *const irn1 = get_value(var->variable.v.value_number, mode);
2310                 ir_node *const irn2 = get_value(var2->variable.v.value_number, mode);
2311
2312                 res = new_d_Confirm(dbi, irn2, irn1, get_inversed_relation(relation));
2313                 set_value(var2->variable.v.value_number, res);
2314
2315                 res = new_d_Confirm(dbi, irn1, irn2, relation);
2316                 set_value(var->variable.v.value_number, res);
2317
2318                 return res;
2319         }
2320
2321         expression_t *con = NULL;
2322         if (is_local_variable(op1) && is_constant_expression(op2) == EXPR_CLASS_CONSTANT) {
2323                 var = op1->reference.entity;
2324                 con = op2;
2325         } else if (is_constant_expression(op1) == EXPR_CLASS_CONSTANT && is_local_variable(op2)) {
2326                 relation = get_inversed_relation(relation);
2327                 var = op2->reference.entity;
2328                 con = op1;
2329         }
2330
2331         if (var != NULL) {
2332                 type_t  *const type = skip_typeref(var->declaration.type);
2333                 ir_mode *const mode = get_ir_mode_storage(type);
2334
2335                 res = get_value(var->variable.v.value_number, mode);
2336                 res = new_d_Confirm(dbi, res, expression_to_firm(con), relation);
2337                 set_value(var->variable.v.value_number, res);
2338         }
2339         return res;
2340 }
2341
2342 /**
2343  * Handle the assume optimizer hint.
2344  *
2345  * @param dbi    debug info
2346  * @param expr   the IL assume expression
2347  */
2348 static ir_node *handle_assume(dbg_info *dbi, const expression_t *expression)
2349 {
2350         switch(expression->kind) {
2351         case EXPR_BINARY_EQUAL:
2352         case EXPR_BINARY_NOTEQUAL:
2353         case EXPR_BINARY_LESS:
2354         case EXPR_BINARY_LESSEQUAL:
2355         case EXPR_BINARY_GREATER:
2356         case EXPR_BINARY_GREATEREQUAL:
2357                 return handle_assume_compare(dbi, &expression->binary);
2358         default:
2359                 return NULL;
2360         }
2361 }
2362
2363 static ir_node *create_cast(dbg_info *dbgi, ir_node *value_node,
2364                             type_t *from_type, type_t *type)
2365 {
2366         type = skip_typeref(type);
2367         if (is_type_void(type)) {
2368                 /* make sure firm type is constructed */
2369                 (void) get_ir_type(type);
2370                 return NULL;
2371         }
2372         if (!is_type_scalar(type)) {
2373                 /* make sure firm type is constructed */
2374                 (void) get_ir_type(type);
2375                 return value_node;
2376         }
2377
2378         from_type     = skip_typeref(from_type);
2379         ir_mode *mode = get_ir_mode_storage(type);
2380         /* check for conversion from / to __based types */
2381         if (is_type_pointer(type) && is_type_pointer(from_type)) {
2382                 const variable_t *from_var = from_type->pointer.base_variable;
2383                 const variable_t *to_var   = type->pointer.base_variable;
2384                 if (from_var != to_var) {
2385                         if (from_var != NULL) {
2386                                 ir_node *const addr = create_symconst(dbgi, from_var->v.entity);
2387                                 ir_node *const base = deref_address(dbgi, from_var->base.type, addr);
2388                                 value_node = new_d_Add(dbgi, value_node, base, get_ir_mode_storage(from_type));
2389                         }
2390                         if (to_var != NULL) {
2391                                 ir_node *const addr = create_symconst(dbgi, to_var->v.entity);
2392                                 ir_node *const base = deref_address(dbgi, to_var->base.type, addr);
2393                                 value_node = new_d_Sub(dbgi, value_node, base, mode);
2394                         }
2395                 }
2396         }
2397
2398         if (is_type_atomic(type, ATOMIC_TYPE_BOOL)) {
2399                 /* bool adjustments (we save a mode_Bu, but have to temporarily
2400                  * convert to mode_b so we only get a 0/1 value */
2401                 value_node = create_conv(dbgi, value_node, mode_b);
2402         }
2403
2404         ir_mode *mode_arith = get_ir_mode_arithmetic(type);
2405         ir_node *node       = create_conv(dbgi, value_node, mode);
2406         node                = do_strict_conv(dbgi, node);
2407         node                = create_conv(dbgi, node, mode_arith);
2408
2409         return node;
2410 }
2411
2412 static ir_node *unary_expression_to_firm(const unary_expression_t *expression)
2413 {
2414         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2415         type_t   *type = skip_typeref(expression->base.type);
2416
2417         const expression_t *value = expression->value;
2418
2419         switch(expression->base.kind) {
2420         case EXPR_UNARY_TAKE_ADDRESS:
2421                 return expression_to_addr(value);
2422
2423         case EXPR_UNARY_NEGATE: {
2424                 ir_node *value_node = expression_to_firm(value);
2425                 ir_mode *mode       = get_ir_mode_arithmetic(type);
2426                 return new_d_Minus(dbgi, value_node, mode);
2427         }
2428         case EXPR_UNARY_PLUS:
2429                 return expression_to_firm(value);
2430         case EXPR_UNARY_BITWISE_NEGATE: {
2431                 ir_node *value_node = expression_to_firm(value);
2432                 ir_mode *mode       = get_ir_mode_arithmetic(type);
2433                 return new_d_Not(dbgi, value_node, mode);
2434         }
2435         case EXPR_UNARY_NOT: {
2436                 ir_node *value_node = _expression_to_firm(value);
2437                 value_node          = create_conv(dbgi, value_node, mode_b);
2438                 ir_node *res        = new_d_Not(dbgi, value_node, mode_b);
2439                 return res;
2440         }
2441         case EXPR_UNARY_DEREFERENCE: {
2442                 ir_node *value_node = expression_to_firm(value);
2443                 type_t  *value_type = skip_typeref(value->base.type);
2444                 assert(is_type_pointer(value_type));
2445
2446                 /* check for __based */
2447                 const variable_t *const base_var = value_type->pointer.base_variable;
2448                 if (base_var != NULL) {
2449                         ir_node *const addr = create_symconst(dbgi, base_var->v.entity);
2450                         ir_node *const base = deref_address(dbgi, base_var->base.type, addr);
2451                         value_node = new_d_Add(dbgi, value_node, base, get_ir_mode_storage(value_type));
2452                 }
2453                 type_t  *points_to  = value_type->pointer.points_to;
2454                 return deref_address(dbgi, points_to, value_node);
2455         }
2456         case EXPR_UNARY_POSTFIX_INCREMENT:
2457         case EXPR_UNARY_POSTFIX_DECREMENT:
2458         case EXPR_UNARY_PREFIX_INCREMENT:
2459         case EXPR_UNARY_PREFIX_DECREMENT:
2460                 return create_incdec(expression);
2461         case EXPR_UNARY_CAST: {
2462                 ir_node *value_node = expression_to_firm(value);
2463                 type_t  *from_type  = value->base.type;
2464                 return create_cast(dbgi, value_node, from_type, type);
2465         }
2466         case EXPR_UNARY_ASSUME:
2467                 return handle_assume(dbgi, value);
2468
2469         default:
2470                 break;
2471         }
2472         panic("invalid UNEXPR type found");
2473 }
2474
2475 /**
2476  * produces a 0/1 depending of the value of a mode_b node
2477  */
2478 static ir_node *produce_condition_result(const expression_t *expression,
2479                                          ir_mode *mode, dbg_info *dbgi)
2480 {
2481         ir_node *const one_block  = new_immBlock();
2482         ir_node *const zero_block = new_immBlock();
2483         create_condition_evaluation(expression, one_block, zero_block);
2484         mature_immBlock(one_block);
2485         mature_immBlock(zero_block);
2486
2487         ir_node *const jmp_one  = new_rd_Jmp(dbgi, one_block);
2488         ir_node *const jmp_zero = new_rd_Jmp(dbgi, zero_block);
2489         ir_node *const in_cf[2] = { jmp_one, jmp_zero };
2490         ir_node *const block    = new_Block(lengthof(in_cf), in_cf);
2491         set_cur_block(block);
2492
2493         ir_node *const one   = new_Const(get_mode_one(mode));
2494         ir_node *const zero  = new_Const(get_mode_null(mode));
2495         ir_node *const in[2] = { one, zero };
2496         ir_node *const val   = new_d_Phi(dbgi, lengthof(in), in, mode);
2497
2498         return val;
2499 }
2500
2501 static ir_node *adjust_for_pointer_arithmetic(dbg_info *dbgi,
2502                 ir_node *value, type_t *type)
2503 {
2504         ir_mode        *const mode         = get_ir_mode_arithmetic(type_ptrdiff_t);
2505         assert(is_type_pointer(type));
2506         pointer_type_t *const pointer_type = &type->pointer;
2507         type_t         *const points_to    = skip_typeref(pointer_type->points_to);
2508         ir_node        *      elem_size    = get_type_size_node(points_to);
2509         elem_size                          = create_conv(dbgi, elem_size, mode);
2510         value                              = create_conv(dbgi, value,     mode);
2511         ir_node        *const mul          = new_d_Mul(dbgi, value, elem_size, mode);
2512         return mul;
2513 }
2514
2515 static ir_node *create_op(dbg_info *dbgi, const binary_expression_t *expression,
2516                           ir_node *left, ir_node *right)
2517 {
2518         ir_mode  *mode;
2519         type_t   *type_left  = skip_typeref(expression->left->base.type);
2520         type_t   *type_right = skip_typeref(expression->right->base.type);
2521
2522         expression_kind_t kind = expression->base.kind;
2523
2524         switch (kind) {
2525         case EXPR_BINARY_SHIFTLEFT:
2526         case EXPR_BINARY_SHIFTRIGHT:
2527         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2528         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2529                 mode  = get_ir_mode_arithmetic(expression->base.type);
2530                 right = create_conv(dbgi, right, atomic_modes[ATOMIC_TYPE_UINT]);
2531                 break;
2532
2533         case EXPR_BINARY_SUB:
2534                 if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
2535                         const pointer_type_t *const ptr_type = &type_left->pointer;
2536
2537                         mode = get_ir_mode_arithmetic(expression->base.type);
2538                         ir_node *const elem_size = get_type_size_node(ptr_type->points_to);
2539                         ir_node *const conv_size = new_d_Conv(dbgi, elem_size, mode);
2540                         ir_node *const sub       = new_d_Sub(dbgi, left, right, mode);
2541                         ir_node *const no_mem    = new_NoMem();
2542                         ir_node *const div       = new_d_DivRL(dbgi, no_mem, sub, conv_size,
2543                                                                                                    mode, op_pin_state_floats);
2544                         return new_d_Proj(dbgi, div, mode, pn_Div_res);
2545                 }
2546                 /* fallthrough */
2547         case EXPR_BINARY_SUB_ASSIGN:
2548                 if (is_type_pointer(type_left)) {
2549                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2550                         mode  = get_ir_mode_arithmetic(type_left);
2551                         break;
2552                 }
2553                 goto normal_node;
2554
2555         case EXPR_BINARY_ADD:
2556         case EXPR_BINARY_ADD_ASSIGN:
2557                 if (is_type_pointer(type_left)) {
2558                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2559                         mode  = get_ir_mode_arithmetic(type_left);
2560                         break;
2561                 } else if (is_type_pointer(type_right)) {
2562                         left  = adjust_for_pointer_arithmetic(dbgi, left, type_right);
2563                         mode  = get_ir_mode_arithmetic(type_right);
2564                         break;
2565                 }
2566                 goto normal_node;
2567
2568         default:
2569 normal_node:
2570                 mode = get_ir_mode_arithmetic(type_right);
2571                 left = create_conv(dbgi, left, mode);
2572                 break;
2573         }
2574
2575         switch (kind) {
2576         case EXPR_BINARY_ADD_ASSIGN:
2577         case EXPR_BINARY_ADD:
2578                 return new_d_Add(dbgi, left, right, mode);
2579         case EXPR_BINARY_SUB_ASSIGN:
2580         case EXPR_BINARY_SUB:
2581                 return new_d_Sub(dbgi, left, right, mode);
2582         case EXPR_BINARY_MUL_ASSIGN:
2583         case EXPR_BINARY_MUL:
2584                 return new_d_Mul(dbgi, left, right, mode);
2585         case EXPR_BINARY_BITWISE_AND:
2586         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2587                 return new_d_And(dbgi, left, right, mode);
2588         case EXPR_BINARY_BITWISE_OR:
2589         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2590                 return new_d_Or(dbgi, left, right, mode);
2591         case EXPR_BINARY_BITWISE_XOR:
2592         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2593                 return new_d_Eor(dbgi, left, right, mode);
2594         case EXPR_BINARY_SHIFTLEFT:
2595         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2596                 return new_d_Shl(dbgi, left, right, mode);
2597         case EXPR_BINARY_SHIFTRIGHT:
2598         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2599                 if (mode_is_signed(mode)) {
2600                         return new_d_Shrs(dbgi, left, right, mode);
2601                 } else {
2602                         return new_d_Shr(dbgi, left, right, mode);
2603                 }
2604         case EXPR_BINARY_DIV:
2605         case EXPR_BINARY_DIV_ASSIGN: {
2606                 ir_node *pin = new_Pin(new_NoMem());
2607                 ir_node *op  = new_d_Div(dbgi, pin, left, right, mode,
2608                                          op_pin_state_floats);
2609                 ir_node *res = new_d_Proj(dbgi, op, mode, pn_Div_res);
2610                 return res;
2611         }
2612         case EXPR_BINARY_MOD:
2613         case EXPR_BINARY_MOD_ASSIGN: {
2614                 ir_node *pin = new_Pin(new_NoMem());
2615                 assert(!mode_is_float(mode));
2616                 ir_node *op  = new_d_Mod(dbgi, pin, left, right, mode,
2617                                          op_pin_state_floats);
2618                 ir_node *res = new_d_Proj(dbgi, op, mode, pn_Mod_res);
2619                 return res;
2620         }
2621         default:
2622                 panic("unexpected expression kind");
2623         }
2624 }
2625
2626 static ir_node *create_lazy_op(const binary_expression_t *expression)
2627 {
2628         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2629         type_t   *type = skip_typeref(expression->base.type);
2630         ir_mode  *mode = get_ir_mode_arithmetic(type);
2631
2632         if (is_constant_expression(expression->left) == EXPR_CLASS_CONSTANT) {
2633                 bool val = fold_constant_to_bool(expression->left);
2634                 expression_kind_t ekind = expression->base.kind;
2635                 assert(ekind == EXPR_BINARY_LOGICAL_AND || ekind == EXPR_BINARY_LOGICAL_OR);
2636                 if (ekind == EXPR_BINARY_LOGICAL_AND) {
2637                         if (!val) {
2638                                 return new_Const(get_mode_null(mode));
2639                         }
2640                 } else {
2641                         if (val) {
2642                                 return new_Const(get_mode_one(mode));
2643                         }
2644                 }
2645
2646                 if (is_constant_expression(expression->right) == EXPR_CLASS_CONSTANT) {
2647                         bool valr = fold_constant_to_bool(expression->right);
2648                         return create_Const_from_bool(mode, valr);
2649                 }
2650
2651                 return produce_condition_result(expression->right, mode, dbgi);
2652         }
2653
2654         return produce_condition_result((const expression_t*) expression, mode,
2655                                         dbgi);
2656 }
2657
2658 typedef ir_node * (*create_arithmetic_func)(dbg_info *dbgi, ir_node *left,
2659                                             ir_node *right, ir_mode *mode);
2660
2661 static ir_node *create_assign_binop(const binary_expression_t *expression)
2662 {
2663         dbg_info *const     dbgi = get_dbg_info(&expression->base.source_position);
2664         const expression_t *left_expr = expression->left;
2665         type_t             *type      = skip_typeref(left_expr->base.type);
2666         ir_node            *right     = expression_to_firm(expression->right);
2667         ir_node            *left_addr = expression_to_addr(left_expr);
2668         ir_node            *left      = get_value_from_lvalue(left_expr, left_addr);
2669         ir_node            *result    = create_op(dbgi, expression, left, right);
2670
2671         result = create_cast(dbgi, result, expression->right->base.type, type);
2672         result = do_strict_conv(dbgi, result);
2673
2674         result = set_value_for_expression_addr(left_expr, result, left_addr);
2675
2676         if (!is_type_compound(type)) {
2677                 ir_mode *mode_arithmetic = get_ir_mode_arithmetic(type);
2678                 result = create_conv(dbgi, result, mode_arithmetic);
2679         }
2680         return result;
2681 }
2682
2683 static ir_node *binary_expression_to_firm(const binary_expression_t *expression)
2684 {
2685         expression_kind_t kind = expression->base.kind;
2686
2687         switch(kind) {
2688         case EXPR_BINARY_EQUAL:
2689         case EXPR_BINARY_NOTEQUAL:
2690         case EXPR_BINARY_LESS:
2691         case EXPR_BINARY_LESSEQUAL:
2692         case EXPR_BINARY_GREATER:
2693         case EXPR_BINARY_GREATEREQUAL:
2694         case EXPR_BINARY_ISGREATER:
2695         case EXPR_BINARY_ISGREATEREQUAL:
2696         case EXPR_BINARY_ISLESS:
2697         case EXPR_BINARY_ISLESSEQUAL:
2698         case EXPR_BINARY_ISLESSGREATER:
2699         case EXPR_BINARY_ISUNORDERED: {
2700                 dbg_info   *dbgi     = get_dbg_info(&expression->base.source_position);
2701                 ir_node    *left     = expression_to_firm(expression->left);
2702                 ir_node    *right    = expression_to_firm(expression->right);
2703                 ir_relation relation = get_relation(kind);
2704                 ir_node    *cmp      = new_d_Cmp(dbgi, left, right, relation);
2705                 return cmp;
2706         }
2707         case EXPR_BINARY_ASSIGN: {
2708                 ir_node *addr  = expression_to_addr(expression->left);
2709                 ir_node *right = expression_to_firm(expression->right);
2710                 ir_node *res
2711                         = set_value_for_expression_addr(expression->left, right, addr);
2712
2713                 type_t  *type            = skip_typeref(expression->base.type);
2714                 if (!is_type_compound(type)) {
2715                         ir_mode *mode_arithmetic = get_ir_mode_arithmetic(type);
2716                         res                      = create_conv(NULL, res, mode_arithmetic);
2717                 }
2718                 return res;
2719         }
2720         case EXPR_BINARY_ADD:
2721         case EXPR_BINARY_SUB:
2722         case EXPR_BINARY_MUL:
2723         case EXPR_BINARY_DIV:
2724         case EXPR_BINARY_MOD:
2725         case EXPR_BINARY_BITWISE_AND:
2726         case EXPR_BINARY_BITWISE_OR:
2727         case EXPR_BINARY_BITWISE_XOR:
2728         case EXPR_BINARY_SHIFTLEFT:
2729         case EXPR_BINARY_SHIFTRIGHT:
2730         {
2731                 dbg_info *dbgi  = get_dbg_info(&expression->base.source_position);
2732                 ir_node  *left  = expression_to_firm(expression->left);
2733                 ir_node  *right = expression_to_firm(expression->right);
2734                 return create_op(dbgi, expression, left, right);
2735         }
2736         case EXPR_BINARY_LOGICAL_AND:
2737         case EXPR_BINARY_LOGICAL_OR:
2738                 return create_lazy_op(expression);
2739         case EXPR_BINARY_COMMA:
2740                 /* create side effects of left side */
2741                 (void) expression_to_firm(expression->left);
2742                 return _expression_to_firm(expression->right);
2743
2744         case EXPR_BINARY_ADD_ASSIGN:
2745         case EXPR_BINARY_SUB_ASSIGN:
2746         case EXPR_BINARY_MUL_ASSIGN:
2747         case EXPR_BINARY_MOD_ASSIGN:
2748         case EXPR_BINARY_DIV_ASSIGN:
2749         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2750         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2751         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2752         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2753         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2754                 return create_assign_binop(expression);
2755         default:
2756                 panic("TODO binexpr type");
2757         }
2758 }
2759
2760 static ir_node *array_access_addr(const array_access_expression_t *expression)
2761 {
2762         dbg_info *dbgi        = get_dbg_info(&expression->base.source_position);
2763         ir_node  *base_addr   = expression_to_firm(expression->array_ref);
2764         ir_node  *offset      = expression_to_firm(expression->index);
2765         type_t   *ref_type    = skip_typeref(expression->array_ref->base.type);
2766         ir_node  *real_offset = adjust_for_pointer_arithmetic(dbgi, offset, ref_type);
2767         ir_node  *result      = new_d_Add(dbgi, base_addr, real_offset, mode_P_data);
2768
2769         return result;
2770 }
2771
2772 static ir_node *array_access_to_firm(
2773                 const array_access_expression_t *expression)
2774 {
2775         dbg_info *dbgi   = get_dbg_info(&expression->base.source_position);
2776         ir_node  *addr   = array_access_addr(expression);
2777         type_t   *type   = revert_automatic_type_conversion(
2778                         (const expression_t*) expression);
2779         type             = skip_typeref(type);
2780
2781         return deref_address(dbgi, type, addr);
2782 }
2783
2784 static long get_offsetof_offset(const offsetof_expression_t *expression)
2785 {
2786         type_t *orig_type = expression->type;
2787         long    offset    = 0;
2788
2789         designator_t *designator = expression->designator;
2790         for ( ; designator != NULL; designator = designator->next) {
2791                 type_t *type = skip_typeref(orig_type);
2792                 /* be sure the type is constructed */
2793                 (void) get_ir_type(type);
2794
2795                 if (designator->symbol != NULL) {
2796                         assert(is_type_compound(type));
2797                         symbol_t *symbol = designator->symbol;
2798
2799                         compound_t *compound = type->compound.compound;
2800                         entity_t   *iter     = compound->members.entities;
2801                         for ( ; iter != NULL; iter = iter->base.next) {
2802                                 if (iter->base.symbol == symbol) {
2803                                         break;
2804                                 }
2805                         }
2806                         assert(iter != NULL);
2807
2808                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
2809                         assert(iter->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
2810                         offset += get_entity_offset(iter->compound_member.entity);
2811
2812                         orig_type = iter->declaration.type;
2813                 } else {
2814                         expression_t *array_index = designator->array_index;
2815                         assert(designator->array_index != NULL);
2816                         assert(is_type_array(type));
2817
2818                         long index         = fold_constant_to_int(array_index);
2819                         ir_type *arr_type  = get_ir_type(type);
2820                         ir_type *elem_type = get_array_element_type(arr_type);
2821                         long     elem_size = get_type_size_bytes(elem_type);
2822
2823                         offset += index * elem_size;
2824
2825                         orig_type = type->array.element_type;
2826                 }
2827         }
2828
2829         return offset;
2830 }
2831
2832 static ir_node *offsetof_to_firm(const offsetof_expression_t *expression)
2833 {
2834         ir_mode   *mode   = get_ir_mode_arithmetic(expression->base.type);
2835         long       offset = get_offsetof_offset(expression);
2836         ir_tarval *tv     = new_tarval_from_long(offset, mode);
2837         dbg_info  *dbgi   = get_dbg_info(&expression->base.source_position);
2838
2839         return new_d_Const(dbgi, tv);
2840 }
2841
2842 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
2843                                      ir_entity *entity, type_t *type);
2844 static ir_initializer_t *create_ir_initializer(
2845                 const initializer_t *initializer, type_t *type);
2846
2847 static ir_entity *create_initializer_entity(dbg_info *dbgi,
2848                                             initializer_t *initializer,
2849                                             type_t *type)
2850 {
2851         /* create the ir_initializer */
2852         ir_graph *const old_current_ir_graph = current_ir_graph;
2853         current_ir_graph = get_const_code_irg();
2854
2855         ir_initializer_t *irinitializer = create_ir_initializer(initializer, type);
2856
2857         assert(current_ir_graph == get_const_code_irg());
2858         current_ir_graph = old_current_ir_graph;
2859
2860         ident     *const id          = id_unique("initializer.%u");
2861         ir_type   *const irtype      = get_ir_type(type);
2862         ir_type   *const global_type = get_glob_type();
2863         ir_entity *const entity      = new_d_entity(global_type, id, irtype, dbgi);
2864         set_entity_ld_ident(entity, id);
2865         set_entity_visibility(entity, ir_visibility_private);
2866         add_entity_linkage(entity, IR_LINKAGE_CONSTANT);
2867         set_entity_initializer(entity, irinitializer);
2868         return entity;
2869 }
2870
2871 static ir_node *compound_literal_addr(compound_literal_expression_t const *const expression)
2872 {
2873         dbg_info      *dbgi        = get_dbg_info(&expression->base.source_position);
2874         type_t        *type        = expression->type;
2875         initializer_t *initializer = expression->initializer;
2876
2877         if (is_constant_initializer(initializer) == EXPR_CLASS_CONSTANT) {
2878                 ir_entity *entity = create_initializer_entity(dbgi, initializer, type);
2879                 return create_symconst(dbgi, entity);
2880         } else {
2881                 /* create an entity on the stack */
2882                 ident   *const id     = id_unique("CompLit.%u");
2883                 ir_type *const irtype = get_ir_type(type);
2884                 ir_type *frame_type   = get_irg_frame_type(current_ir_graph);
2885
2886                 ir_entity *const entity = new_d_entity(frame_type, id, irtype, dbgi);
2887                 set_entity_ld_ident(entity, id);
2888
2889                 /* create initialisation code */
2890                 create_local_initializer(initializer, dbgi, entity, type);
2891
2892                 /* create a sel for the compound literal address */
2893                 ir_node *frame = get_irg_frame(current_ir_graph);
2894                 ir_node *sel   = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
2895                 return sel;
2896         }
2897 }
2898
2899 static ir_node *compound_literal_to_firm(compound_literal_expression_t const* const expr)
2900 {
2901         dbg_info *const dbgi = get_dbg_info(&expr->base.source_position);
2902         type_t   *const type = expr->type;
2903         ir_node  *const addr = compound_literal_addr(expr);
2904         return deref_address(dbgi, type, addr);
2905 }
2906
2907 /**
2908  * Transform a sizeof expression into Firm code.
2909  */
2910 static ir_node *sizeof_to_firm(const typeprop_expression_t *expression)
2911 {
2912         type_t *const type = skip_typeref(expression->type);
2913         /* §6.5.3.4:2 if the type is a VLA, evaluate the expression. */
2914         if (is_type_array(type) && type->array.is_vla
2915                         && expression->tp_expression != NULL) {
2916                 expression_to_firm(expression->tp_expression);
2917         }
2918
2919         return get_type_size_node(type);
2920 }
2921
2922 static entity_t *get_expression_entity(const expression_t *expression)
2923 {
2924         if (expression->kind != EXPR_REFERENCE)
2925                 return NULL;
2926
2927         return expression->reference.entity;
2928 }
2929
2930 static unsigned get_cparser_entity_alignment(const entity_t *entity)
2931 {
2932         switch(entity->kind) {
2933         case DECLARATION_KIND_CASES:
2934                 return entity->declaration.alignment;
2935         case ENTITY_STRUCT:
2936         case ENTITY_UNION:
2937                 return entity->compound.alignment;
2938         case ENTITY_TYPEDEF:
2939                 return entity->typedefe.alignment;
2940         default:
2941                 break;
2942         }
2943         return 0;
2944 }
2945
2946 /**
2947  * Transform an alignof expression into Firm code.
2948  */
2949 static ir_node *alignof_to_firm(const typeprop_expression_t *expression)
2950 {
2951         unsigned alignment = 0;
2952
2953         const expression_t *tp_expression = expression->tp_expression;
2954         if (tp_expression != NULL) {
2955                 entity_t *entity = get_expression_entity(tp_expression);
2956                 if (entity != NULL) {
2957                         if (entity->kind == ENTITY_FUNCTION) {
2958                                 /* a gnu-extension */
2959                                 alignment = 1;
2960                         } else {
2961                                 alignment = get_cparser_entity_alignment(entity);
2962                         }
2963                 }
2964         }
2965
2966         if (alignment == 0) {
2967                 type_t *type = expression->type;
2968                 alignment = get_type_alignment(type);
2969         }
2970
2971         dbg_info  *dbgi = get_dbg_info(&expression->base.source_position);
2972         ir_mode   *mode = get_ir_mode_arithmetic(expression->base.type);
2973         ir_tarval *tv   = new_tarval_from_long(alignment, mode);
2974         return new_d_Const(dbgi, tv);
2975 }
2976
2977 static void init_ir_types(void);
2978
2979 static ir_tarval *fold_constant_to_tarval(const expression_t *expression)
2980 {
2981         assert(is_constant_expression(expression) == EXPR_CLASS_CONSTANT);
2982
2983         bool constant_folding_old = constant_folding;
2984         constant_folding = true;
2985         int old_optimize         = get_optimize();
2986         int old_constant_folding = get_opt_constant_folding();
2987         set_optimize(1);
2988         set_opt_constant_folding(1);
2989
2990         init_ir_types();
2991
2992         ir_graph *old_current_ir_graph = current_ir_graph;
2993         current_ir_graph = get_const_code_irg();
2994
2995         ir_node *cnst = expression_to_firm(expression);
2996         current_ir_graph = old_current_ir_graph;
2997         set_optimize(old_optimize);
2998         set_opt_constant_folding(old_constant_folding);
2999
3000         if (!is_Const(cnst)) {
3001                 panic("couldn't fold constant");
3002         }
3003
3004         constant_folding = constant_folding_old;
3005
3006         return get_Const_tarval(cnst);
3007 }
3008
3009 /* this function is only used in parser.c, but it relies on libfirm functionality */
3010 bool constant_is_negative(const expression_t *expression)
3011 {
3012         ir_tarval *tv = fold_constant_to_tarval(expression);
3013         return tarval_is_negative(tv);
3014 }
3015
3016 long fold_constant_to_int(const expression_t *expression)
3017 {
3018         ir_tarval *tv = fold_constant_to_tarval(expression);
3019         if (!tarval_is_long(tv)) {
3020                 panic("result of constant folding is not integer");
3021         }
3022
3023         return get_tarval_long(tv);
3024 }
3025
3026 bool fold_constant_to_bool(const expression_t *expression)
3027 {
3028         ir_tarval *tv = fold_constant_to_tarval(expression);
3029         return !tarval_is_null(tv);
3030 }
3031
3032 static ir_node *conditional_to_firm(const conditional_expression_t *expression)
3033 {
3034         dbg_info *const dbgi = get_dbg_info(&expression->base.source_position);
3035
3036         /* first try to fold a constant condition */
3037         if (is_constant_expression(expression->condition) == EXPR_CLASS_CONSTANT) {
3038                 bool val = fold_constant_to_bool(expression->condition);
3039                 if (val) {
3040                         expression_t *true_expression = expression->true_expression;
3041                         if (true_expression == NULL)
3042                                 true_expression = expression->condition;
3043                         return expression_to_firm(true_expression);
3044                 } else {
3045                         return expression_to_firm(expression->false_expression);
3046                 }
3047         }
3048
3049         ir_node *const true_block  = new_immBlock();
3050         ir_node *const false_block = new_immBlock();
3051         ir_node *const cond_expr   = create_condition_evaluation(expression->condition, true_block, false_block);
3052         mature_immBlock(true_block);
3053         mature_immBlock(false_block);
3054
3055         set_cur_block(true_block);
3056         ir_node *true_val;
3057         if (expression->true_expression != NULL) {
3058                 true_val = expression_to_firm(expression->true_expression);
3059         } else if (cond_expr != NULL && get_irn_mode(cond_expr) != mode_b) {
3060                 true_val = cond_expr;
3061         } else {
3062                 /* Condition ended with a short circuit (&&, ||, !) operation or a
3063                  * comparison.  Generate a "1" as value for the true branch. */
3064                 true_val = new_Const(get_mode_one(mode_Is));
3065         }
3066         ir_node *const true_jmp = new_d_Jmp(dbgi);
3067
3068         set_cur_block(false_block);
3069         ir_node *const false_val = expression_to_firm(expression->false_expression);
3070         ir_node *const false_jmp = new_d_Jmp(dbgi);
3071
3072         /* create the common block */
3073         ir_node *const in_cf[2] = { true_jmp, false_jmp };
3074         ir_node *const block    = new_Block(lengthof(in_cf), in_cf);
3075         set_cur_block(block);
3076
3077         /* TODO improve static semantics, so either both or no values are NULL */
3078         if (true_val == NULL || false_val == NULL)
3079                 return NULL;
3080
3081         ir_node *const in[2] = { true_val, false_val };
3082         type_t  *const type  = skip_typeref(expression->base.type);
3083         ir_mode *const mode  = get_ir_mode_arithmetic(type);
3084         ir_node *const val   = new_d_Phi(dbgi, lengthof(in), in, mode);
3085
3086         return val;
3087 }
3088
3089 /**
3090  * Returns an IR-node representing the address of a field.
3091  */
3092 static ir_node *select_addr(const select_expression_t *expression)
3093 {
3094         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3095
3096         construct_select_compound(expression);
3097
3098         ir_node *compound_addr = expression_to_firm(expression->compound);
3099
3100         entity_t *entry = expression->compound_entry;
3101         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3102         assert(entry->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
3103
3104         if (constant_folding) {
3105                 ir_mode *mode      = get_irn_mode(compound_addr);
3106                 ir_mode *mode_uint = get_reference_mode_unsigned_eq(mode);
3107                 ir_node *ofs       = new_Const_long(mode_uint, entry->compound_member.offset);
3108                 return new_d_Add(dbgi, compound_addr, ofs, mode);
3109         } else {
3110                 ir_entity *irentity = entry->compound_member.entity;
3111                 assert(irentity != NULL);
3112                 return new_d_simpleSel(dbgi, new_NoMem(), compound_addr, irentity);
3113         }
3114 }
3115
3116 static ir_node *select_to_firm(const select_expression_t *expression)
3117 {
3118         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3119         ir_node  *addr = select_addr(expression);
3120         type_t   *type = revert_automatic_type_conversion(
3121                         (const expression_t*) expression);
3122         type           = skip_typeref(type);
3123
3124         entity_t *entry = expression->compound_entry;
3125         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3126
3127         if (entry->compound_member.bitfield) {
3128                 return bitfield_extract_to_firm(expression, addr);
3129         }
3130
3131         return deref_address(dbgi, type, addr);
3132 }
3133
3134 /* Values returned by __builtin_classify_type. */
3135 typedef enum gcc_type_class
3136 {
3137         no_type_class = -1,
3138         void_type_class,
3139         integer_type_class,
3140         char_type_class,
3141         enumeral_type_class,
3142         boolean_type_class,
3143         pointer_type_class,
3144         reference_type_class,
3145         offset_type_class,
3146         real_type_class,
3147         complex_type_class,
3148         function_type_class,
3149         method_type_class,
3150         record_type_class,
3151         union_type_class,
3152         array_type_class,
3153         string_type_class,
3154         set_type_class,
3155         file_type_class,
3156         lang_type_class
3157 } gcc_type_class;
3158
3159 static ir_node *classify_type_to_firm(const classify_type_expression_t *const expr)
3160 {
3161         type_t *type = expr->type_expression->base.type;
3162
3163         /* FIXME gcc returns different values depending on whether compiling C or C++
3164          * e.g. int x[10] is pointer_type_class in C, but array_type_class in C++ */
3165         gcc_type_class tc;
3166         for (;;) {
3167                 type = skip_typeref(type);
3168                 switch (type->kind) {
3169                         case TYPE_ATOMIC: {
3170                                 const atomic_type_t *const atomic_type = &type->atomic;
3171                                 switch (atomic_type->akind) {
3172                                         /* should not be reached */
3173                                         case ATOMIC_TYPE_INVALID:
3174                                                 tc = no_type_class;
3175                                                 goto make_const;
3176
3177                                         /* gcc cannot do that */
3178                                         case ATOMIC_TYPE_VOID:
3179                                                 tc = void_type_class;
3180                                                 goto make_const;
3181
3182                                         case ATOMIC_TYPE_WCHAR_T:   /* gcc handles this as integer */
3183                                         case ATOMIC_TYPE_CHAR:      /* gcc handles this as integer */
3184                                         case ATOMIC_TYPE_SCHAR:     /* gcc handles this as integer */
3185                                         case ATOMIC_TYPE_UCHAR:     /* gcc handles this as integer */
3186                                         case ATOMIC_TYPE_SHORT:
3187                                         case ATOMIC_TYPE_USHORT:
3188                                         case ATOMIC_TYPE_INT:
3189                                         case ATOMIC_TYPE_UINT:
3190                                         case ATOMIC_TYPE_LONG:
3191                                         case ATOMIC_TYPE_ULONG:
3192                                         case ATOMIC_TYPE_LONGLONG:
3193                                         case ATOMIC_TYPE_ULONGLONG:
3194                                         case ATOMIC_TYPE_BOOL:      /* gcc handles this as integer */
3195                                                 tc = integer_type_class;
3196                                                 goto make_const;
3197
3198                                         case ATOMIC_TYPE_FLOAT:
3199                                         case ATOMIC_TYPE_DOUBLE:
3200                                         case ATOMIC_TYPE_LONG_DOUBLE:
3201                                                 tc = real_type_class;
3202                                                 goto make_const;
3203                                 }
3204                                 panic("Unexpected atomic type in classify_type_to_firm().");
3205                         }
3206
3207                         case TYPE_COMPLEX:         tc = complex_type_class; goto make_const;
3208                         case TYPE_IMAGINARY:       tc = complex_type_class; goto make_const;
3209                         case TYPE_ARRAY:           /* gcc handles this as pointer */
3210                         case TYPE_FUNCTION:        /* gcc handles this as pointer */
3211                         case TYPE_POINTER:         tc = pointer_type_class; goto make_const;
3212                         case TYPE_COMPOUND_STRUCT: tc = record_type_class;  goto make_const;
3213                         case TYPE_COMPOUND_UNION:  tc = union_type_class;   goto make_const;
3214
3215                         /* gcc handles this as integer */
3216                         case TYPE_ENUM:            tc = integer_type_class; goto make_const;
3217
3218                         /* gcc classifies the referenced type */
3219                         case TYPE_REFERENCE: type = type->reference.refers_to; continue;
3220
3221                         /* typedef/typeof should be skipped already */
3222                         case TYPE_TYPEDEF:
3223                         case TYPE_TYPEOF:
3224                         case TYPE_ERROR:
3225                                 break;
3226                 }
3227                 panic("unexpected TYPE classify_type_to_firm().");
3228         }
3229
3230 make_const:;
3231         dbg_info  *const dbgi = get_dbg_info(&expr->base.source_position);
3232         ir_mode   *const mode = atomic_modes[ATOMIC_TYPE_INT];
3233         ir_tarval *const tv   = new_tarval_from_long(tc, mode);
3234         return new_d_Const(dbgi, tv);
3235 }
3236
3237 static ir_node *function_name_to_firm(
3238                 const funcname_expression_t *const expr)
3239 {
3240         switch(expr->kind) {
3241         case FUNCNAME_FUNCTION:
3242         case FUNCNAME_PRETTY_FUNCTION:
3243         case FUNCNAME_FUNCDNAME:
3244                 if (current_function_name == NULL) {
3245                         const source_position_t *const src_pos = &expr->base.source_position;
3246                         const char    *name  = current_function_entity->base.symbol->string;
3247                         const string_t string = { name, strlen(name) + 1 };
3248                         current_function_name = string_to_firm(src_pos, "__func__.%u", &string);
3249                 }
3250                 return current_function_name;
3251         case FUNCNAME_FUNCSIG:
3252                 if (current_funcsig == NULL) {
3253                         const source_position_t *const src_pos = &expr->base.source_position;
3254                         ir_entity *ent = get_irg_entity(current_ir_graph);
3255                         const char *const name = get_entity_ld_name(ent);
3256                         const string_t string = { name, strlen(name) + 1 };
3257                         current_funcsig = string_to_firm(src_pos, "__FUNCSIG__.%u", &string);
3258                 }
3259                 return current_funcsig;
3260         }
3261         panic("Unsupported function name");
3262 }
3263
3264 static ir_node *statement_expression_to_firm(const statement_expression_t *expr)
3265 {
3266         statement_t *statement = expr->statement;
3267
3268         assert(statement->kind == STATEMENT_COMPOUND);
3269         return compound_statement_to_firm(&statement->compound);
3270 }
3271
3272 static ir_node *va_start_expression_to_firm(
3273         const va_start_expression_t *const expr)
3274 {
3275         ir_entity *param_ent = current_vararg_entity;
3276         if (param_ent == NULL) {
3277                 size_t   const n           = IR_VA_START_PARAMETER_NUMBER;
3278                 ir_type *const frame_type  = get_irg_frame_type(current_ir_graph);
3279                 ir_type *const param_type  = get_unknown_type();
3280                 param_ent = new_parameter_entity(frame_type, n, param_type);
3281                 current_vararg_entity = param_ent;
3282         }
3283
3284         ir_node  *const frame   = get_irg_frame(current_ir_graph);
3285         dbg_info *const dbgi    = get_dbg_info(&expr->base.source_position);
3286         ir_node  *const no_mem  = new_NoMem();
3287         ir_node  *const arg_sel = new_d_simpleSel(dbgi, no_mem, frame, param_ent);
3288
3289         set_value_for_expression(expr->ap, arg_sel);
3290
3291         return NULL;
3292 }
3293
3294 static ir_node *va_arg_expression_to_firm(const va_arg_expression_t *const expr)
3295 {
3296         type_t       *const type    = expr->base.type;
3297         expression_t *const ap_expr = expr->ap;
3298         ir_node      *const ap_addr = expression_to_addr(ap_expr);
3299         ir_node      *const ap      = get_value_from_lvalue(ap_expr, ap_addr);
3300         dbg_info     *const dbgi    = get_dbg_info(&expr->base.source_position);
3301         ir_node      *const res     = deref_address(dbgi, type, ap);
3302
3303         ir_node      *const cnst    = get_type_size_node(expr->base.type);
3304         ir_mode      *const mode    = get_irn_mode(cnst);
3305         ir_node      *const c1      = new_Const_long(mode, stack_param_align - 1);
3306         ir_node      *const c2      = new_d_Add(dbgi, cnst, c1, mode);
3307         ir_node      *const c3      = new_Const_long(mode, -(long)stack_param_align);
3308         ir_node      *const c4      = new_d_And(dbgi, c2, c3, mode);
3309         ir_node      *const add     = new_d_Add(dbgi, ap, c4, mode_P_data);
3310
3311         set_value_for_expression_addr(ap_expr, add, ap_addr);
3312
3313         return res;
3314 }
3315
3316 /**
3317  * Generate Firm for a va_copy expression.
3318  */
3319 static ir_node *va_copy_expression_to_firm(const va_copy_expression_t *const expr)
3320 {
3321         ir_node *const src = expression_to_firm(expr->src);
3322         set_value_for_expression(expr->dst, src);
3323         return NULL;
3324 }
3325
3326 static ir_node *dereference_addr(const unary_expression_t *const expression)
3327 {
3328         assert(expression->base.kind == EXPR_UNARY_DEREFERENCE);
3329         return expression_to_firm(expression->value);
3330 }
3331
3332 /**
3333  * Returns a IR-node representing an lvalue of the given expression.
3334  */
3335 static ir_node *expression_to_addr(const expression_t *expression)
3336 {
3337         switch(expression->kind) {
3338         case EXPR_ARRAY_ACCESS:
3339                 return array_access_addr(&expression->array_access);
3340         case EXPR_CALL:
3341                 return call_expression_to_firm(&expression->call);
3342         case EXPR_COMPOUND_LITERAL:
3343                 return compound_literal_addr(&expression->compound_literal);
3344         case EXPR_REFERENCE:
3345                 return reference_addr(&expression->reference);
3346         case EXPR_SELECT:
3347                 return select_addr(&expression->select);
3348         case EXPR_UNARY_DEREFERENCE:
3349                 return dereference_addr(&expression->unary);
3350         default:
3351                 break;
3352         }
3353         panic("trying to get address of non-lvalue");
3354 }
3355
3356 static ir_node *builtin_constant_to_firm(
3357                 const builtin_constant_expression_t *expression)
3358 {
3359         ir_mode *const mode = get_ir_mode_arithmetic(expression->base.type);
3360         bool     const v    = is_constant_expression(expression->value) == EXPR_CLASS_CONSTANT;
3361         return create_Const_from_bool(mode, v);
3362 }
3363
3364 static ir_node *builtin_types_compatible_to_firm(
3365                 const builtin_types_compatible_expression_t *expression)
3366 {
3367         type_t  *const left  = get_unqualified_type(skip_typeref(expression->left));
3368         type_t  *const right = get_unqualified_type(skip_typeref(expression->right));
3369         bool     const value = types_compatible(left, right);
3370         ir_mode *const mode  = get_ir_mode_arithmetic(expression->base.type);
3371         return create_Const_from_bool(mode, value);
3372 }
3373
3374 static ir_node *get_label_block(label_t *label)
3375 {
3376         if (label->block != NULL)
3377                 return label->block;
3378
3379         /* beware: might be called from create initializer with current_ir_graph
3380          * set to const_code_irg. */
3381         ir_graph *rem    = current_ir_graph;
3382         current_ir_graph = current_function;
3383
3384         ir_node *block = new_immBlock();
3385
3386         label->block = block;
3387
3388         ARR_APP1(label_t *, all_labels, label);
3389
3390         current_ir_graph = rem;
3391         return block;
3392 }
3393
3394 /**
3395  * Pointer to a label.  This is used for the
3396  * GNU address-of-label extension.
3397  */
3398 static ir_node *label_address_to_firm(const label_address_expression_t *label)
3399 {
3400         dbg_info  *dbgi   = get_dbg_info(&label->base.source_position);
3401         ir_node   *block  = get_label_block(label->label);
3402         ir_entity *entity = create_Block_entity(block);
3403
3404         symconst_symbol value;
3405         value.entity_p = entity;
3406         return new_d_SymConst(dbgi, mode_P_code, value, symconst_addr_ent);
3407 }
3408
3409 /**
3410  * creates firm nodes for an expression. The difference between this function
3411  * and expression_to_firm is, that this version might produce mode_b nodes
3412  * instead of mode_Is.
3413  */
3414 static ir_node *_expression_to_firm(expression_t const *const expr)
3415 {
3416 #ifndef NDEBUG
3417         if (!constant_folding) {
3418                 assert(!expr->base.transformed);
3419                 ((expression_t*)expr)->base.transformed = true;
3420         }
3421 #endif
3422
3423         switch (expr->kind) {
3424         case EXPR_ALIGNOF:                    return alignof_to_firm(                 &expr->typeprop);
3425         case EXPR_ARRAY_ACCESS:               return array_access_to_firm(            &expr->array_access);
3426         case EXPR_BINARY_CASES:               return binary_expression_to_firm(       &expr->binary);
3427         case EXPR_BUILTIN_CONSTANT_P:         return builtin_constant_to_firm(        &expr->builtin_constant);
3428         case EXPR_BUILTIN_TYPES_COMPATIBLE_P: return builtin_types_compatible_to_firm(&expr->builtin_types_compatible);
3429         case EXPR_CALL:                       return call_expression_to_firm(         &expr->call);
3430         case EXPR_CLASSIFY_TYPE:              return classify_type_to_firm(           &expr->classify_type);
3431         case EXPR_COMPOUND_LITERAL:           return compound_literal_to_firm(        &expr->compound_literal);
3432         case EXPR_CONDITIONAL:                return conditional_to_firm(             &expr->conditional);
3433         case EXPR_FUNCNAME:                   return function_name_to_firm(           &expr->funcname);
3434         case EXPR_LABEL_ADDRESS:              return label_address_to_firm(           &expr->label_address);
3435         case EXPR_LITERAL_CASES:              return literal_to_firm(                 &expr->literal);
3436         case EXPR_OFFSETOF:                   return offsetof_to_firm(                &expr->offsetofe);
3437         case EXPR_REFERENCE:                  return reference_expression_to_firm(    &expr->reference);
3438         case EXPR_ENUM_CONSTANT:              return enum_constant_to_firm(           &expr->reference);
3439         case EXPR_SELECT:                     return select_to_firm(                  &expr->select);
3440         case EXPR_SIZEOF:                     return sizeof_to_firm(                  &expr->typeprop);
3441         case EXPR_STATEMENT:                  return statement_expression_to_firm(    &expr->statement);
3442         case EXPR_UNARY_CASES:                return unary_expression_to_firm(        &expr->unary);
3443         case EXPR_VA_ARG:                     return va_arg_expression_to_firm(       &expr->va_arge);
3444         case EXPR_VA_COPY:                    return va_copy_expression_to_firm(      &expr->va_copye);
3445         case EXPR_VA_START:                   return va_start_expression_to_firm(     &expr->va_starte);
3446         case EXPR_WIDE_STRING_LITERAL:        return wide_string_literal_to_firm(     &expr->string_literal);
3447
3448         case EXPR_STRING_LITERAL: return string_to_firm(&expr->base.source_position, "str.%u", &expr->literal.value);
3449
3450         case EXPR_ERROR: break;
3451         }
3452         panic("invalid expression found");
3453 }
3454
3455 /**
3456  * Check if a given expression is a GNU __builtin_expect() call.
3457  */
3458 static bool is_builtin_expect(const expression_t *expression)
3459 {
3460         if (expression->kind != EXPR_CALL)
3461                 return false;
3462
3463         expression_t *function = expression->call.function;
3464         if (function->kind != EXPR_REFERENCE)
3465                 return false;
3466         reference_expression_t *ref = &function->reference;
3467         if (ref->entity->kind         != ENTITY_FUNCTION ||
3468             ref->entity->function.btk != BUILTIN_EXPECT)
3469                 return false;
3470
3471         return true;
3472 }
3473
3474 static bool produces_mode_b(const expression_t *expression)
3475 {
3476         switch (expression->kind) {
3477         case EXPR_BINARY_EQUAL:
3478         case EXPR_BINARY_NOTEQUAL:
3479         case EXPR_BINARY_LESS:
3480         case EXPR_BINARY_LESSEQUAL:
3481         case EXPR_BINARY_GREATER:
3482         case EXPR_BINARY_GREATEREQUAL:
3483         case EXPR_BINARY_ISGREATER:
3484         case EXPR_BINARY_ISGREATEREQUAL:
3485         case EXPR_BINARY_ISLESS:
3486         case EXPR_BINARY_ISLESSEQUAL:
3487         case EXPR_BINARY_ISLESSGREATER:
3488         case EXPR_BINARY_ISUNORDERED:
3489         case EXPR_UNARY_NOT:
3490                 return true;
3491
3492         case EXPR_CALL:
3493                 if (is_builtin_expect(expression)) {
3494                         expression_t *argument = expression->call.arguments->expression;
3495                         return produces_mode_b(argument);
3496                 }
3497                 return false;
3498         case EXPR_BINARY_COMMA:
3499                 return produces_mode_b(expression->binary.right);
3500
3501         default:
3502                 return false;
3503         }
3504 }
3505
3506 static ir_node *expression_to_firm(const expression_t *expression)
3507 {
3508         if (!produces_mode_b(expression)) {
3509                 ir_node *res = _expression_to_firm(expression);
3510                 assert(res == NULL || get_irn_mode(res) != mode_b);
3511                 return res;
3512         }
3513
3514         if (is_constant_expression(expression) == EXPR_CLASS_CONSTANT) {
3515                 bool const constant_folding_old = constant_folding;
3516                 constant_folding = true;
3517                 ir_node *res  = _expression_to_firm(expression);
3518                 constant_folding = constant_folding_old;
3519                 ir_mode *mode = get_ir_mode_arithmetic(expression->base.type);
3520                 assert(is_Const(res));
3521                 return create_Const_from_bool(mode, !is_Const_null(res));
3522         }
3523
3524         /* we have to produce a 0/1 from the mode_b expression */
3525         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3526         ir_mode  *mode = get_ir_mode_arithmetic(expression->base.type);
3527         return produce_condition_result(expression, mode, dbgi);
3528 }
3529
3530 /**
3531  * create a short-circuit expression evaluation that tries to construct
3532  * efficient control flow structures for &&, || and ! expressions
3533  */
3534 static ir_node *create_condition_evaluation(const expression_t *expression,
3535                                             ir_node *true_block,
3536                                             ir_node *false_block)
3537 {
3538         switch(expression->kind) {
3539         case EXPR_UNARY_NOT: {
3540                 const unary_expression_t *unary_expression = &expression->unary;
3541                 create_condition_evaluation(unary_expression->value, false_block,
3542                                             true_block);
3543                 return NULL;
3544         }
3545         case EXPR_BINARY_LOGICAL_AND: {
3546                 const binary_expression_t *binary_expression = &expression->binary;
3547
3548                 ir_node *extra_block = new_immBlock();
3549                 create_condition_evaluation(binary_expression->left, extra_block,
3550                                             false_block);
3551                 mature_immBlock(extra_block);
3552                 set_cur_block(extra_block);
3553                 create_condition_evaluation(binary_expression->right, true_block,
3554                                             false_block);
3555                 return NULL;
3556         }
3557         case EXPR_BINARY_LOGICAL_OR: {
3558                 const binary_expression_t *binary_expression = &expression->binary;
3559
3560                 ir_node *extra_block = new_immBlock();
3561                 create_condition_evaluation(binary_expression->left, true_block,
3562                                             extra_block);
3563                 mature_immBlock(extra_block);
3564                 set_cur_block(extra_block);
3565                 create_condition_evaluation(binary_expression->right, true_block,
3566                                             false_block);
3567                 return NULL;
3568         }
3569         default:
3570                 break;
3571         }
3572
3573         dbg_info *dbgi       = get_dbg_info(&expression->base.source_position);
3574         ir_node  *cond_expr  = _expression_to_firm(expression);
3575         ir_node  *condition  = create_conv(dbgi, cond_expr, mode_b);
3576         ir_node  *cond       = new_d_Cond(dbgi, condition);
3577         ir_node  *true_proj  = new_d_Proj(dbgi, cond, mode_X, pn_Cond_true);
3578         ir_node  *false_proj = new_d_Proj(dbgi, cond, mode_X, pn_Cond_false);
3579
3580         /* set branch prediction info based on __builtin_expect */
3581         if (is_builtin_expect(expression) && is_Cond(cond)) {
3582                 call_argument_t *argument = expression->call.arguments->next;
3583                 if (is_constant_expression(argument->expression) == EXPR_CLASS_CONSTANT) {
3584                         bool               const cnst = fold_constant_to_bool(argument->expression);
3585                         cond_jmp_predicate const pred = cnst ? COND_JMP_PRED_TRUE : COND_JMP_PRED_FALSE;
3586                         set_Cond_jmp_pred(cond, pred);
3587                 }
3588         }
3589
3590         add_immBlock_pred(true_block, true_proj);
3591         add_immBlock_pred(false_block, false_proj);
3592
3593         set_unreachable_now();
3594         return cond_expr;
3595 }
3596
3597 static void create_variable_entity(entity_t *variable,
3598                                    declaration_kind_t declaration_kind,
3599                                    ir_type *parent_type)
3600 {
3601         assert(variable->kind == ENTITY_VARIABLE);
3602         type_t    *type = skip_typeref(variable->declaration.type);
3603
3604         ident     *const id        = new_id_from_str(variable->base.symbol->string);
3605         ir_type   *const irtype    = get_ir_type(type);
3606         dbg_info  *const dbgi      = get_dbg_info(&variable->base.source_position);
3607         ir_entity *const irentity  = new_d_entity(parent_type, id, irtype, dbgi);
3608         unsigned         alignment = variable->declaration.alignment;
3609
3610         set_entity_alignment(irentity, alignment);
3611
3612         handle_decl_modifiers(irentity, variable);
3613
3614         variable->declaration.kind  = (unsigned char) declaration_kind;
3615         variable->variable.v.entity = irentity;
3616         set_entity_ld_ident(irentity, create_ld_ident(variable));
3617
3618         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
3619                 set_entity_volatility(irentity, volatility_is_volatile);
3620         }
3621 }
3622
3623
3624 typedef struct type_path_entry_t type_path_entry_t;
3625 struct type_path_entry_t {
3626         type_t           *type;
3627         ir_initializer_t *initializer;
3628         size_t            index;
3629         entity_t         *compound_entry;
3630 };
3631
3632 typedef struct type_path_t type_path_t;
3633 struct type_path_t {
3634         type_path_entry_t *path;
3635         type_t            *top_type;
3636         bool               invalid;
3637 };
3638
3639 static __attribute__((unused)) void debug_print_type_path(const type_path_t *path)
3640 {
3641         size_t len = ARR_LEN(path->path);
3642
3643         for (size_t i = 0; i < len; ++i) {
3644                 const type_path_entry_t *entry = & path->path[i];
3645
3646                 type_t *type = skip_typeref(entry->type);
3647                 if (is_type_compound(type)) {
3648                         fprintf(stderr, ".%s", entry->compound_entry->base.symbol->string);
3649                 } else if (is_type_array(type)) {
3650                         fprintf(stderr, "[%u]", (unsigned) entry->index);
3651                 } else {
3652                         fprintf(stderr, "-INVALID-");
3653                 }
3654         }
3655         fprintf(stderr, "  (");
3656         print_type(path->top_type);
3657         fprintf(stderr, ")");
3658 }
3659
3660 static type_path_entry_t *get_type_path_top(const type_path_t *path)
3661 {
3662         size_t len = ARR_LEN(path->path);
3663         assert(len > 0);
3664         return & path->path[len-1];
3665 }
3666
3667 static type_path_entry_t *append_to_type_path(type_path_t *path)
3668 {
3669         size_t len = ARR_LEN(path->path);
3670         ARR_RESIZE(type_path_entry_t, path->path, len+1);
3671
3672         type_path_entry_t *result = & path->path[len];
3673         memset(result, 0, sizeof(result[0]));
3674         return result;
3675 }
3676
3677 static size_t get_compound_member_count(const compound_type_t *type)
3678 {
3679         compound_t *compound  = type->compound;
3680         size_t      n_members = 0;
3681         entity_t   *member    = compound->members.entities;
3682         for ( ; member != NULL; member = member->base.next) {
3683                 ++n_members;
3684         }
3685
3686         return n_members;
3687 }
3688
3689 static ir_initializer_t *get_initializer_entry(type_path_t *path)
3690 {
3691         type_t *orig_top_type = path->top_type;
3692         type_t *top_type      = skip_typeref(orig_top_type);
3693
3694         assert(is_type_compound(top_type) || is_type_array(top_type));
3695
3696         if (ARR_LEN(path->path) == 0) {
3697                 return NULL;
3698         } else {
3699                 type_path_entry_t *top         = get_type_path_top(path);
3700                 ir_initializer_t  *initializer = top->initializer;
3701                 return get_initializer_compound_value(initializer, top->index);
3702         }
3703 }
3704
3705 static void descend_into_subtype(type_path_t *path)
3706 {
3707         type_t *orig_top_type = path->top_type;
3708         type_t *top_type      = skip_typeref(orig_top_type);
3709
3710         assert(is_type_compound(top_type) || is_type_array(top_type));
3711
3712         ir_initializer_t *initializer = get_initializer_entry(path);
3713
3714         type_path_entry_t *top = append_to_type_path(path);
3715         top->type              = top_type;
3716
3717         size_t len;
3718
3719         if (is_type_compound(top_type)) {
3720                 compound_t *const compound = top_type->compound.compound;
3721                 entity_t   *const entry    = skip_unnamed_bitfields(compound->members.entities);
3722
3723                 top->compound_entry = entry;
3724                 top->index          = 0;
3725                 len                 = get_compound_member_count(&top_type->compound);
3726                 if (entry != NULL) {
3727                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3728                         path->top_type = entry->declaration.type;
3729                 }
3730         } else {
3731                 assert(is_type_array(top_type));
3732                 assert(top_type->array.size > 0);
3733
3734                 top->index     = 0;
3735                 path->top_type = top_type->array.element_type;
3736                 len            = top_type->array.size;
3737         }
3738         if (initializer == NULL
3739                         || get_initializer_kind(initializer) == IR_INITIALIZER_NULL) {
3740                 initializer = create_initializer_compound(len);
3741                 /* we have to set the entry at the 2nd latest path entry... */
3742                 size_t path_len = ARR_LEN(path->path);
3743                 assert(path_len >= 1);
3744                 if (path_len > 1) {
3745                         type_path_entry_t *entry        = & path->path[path_len-2];
3746                         ir_initializer_t  *tinitializer = entry->initializer;
3747                         set_initializer_compound_value(tinitializer, entry->index,
3748                                                        initializer);
3749                 }
3750         }
3751         top->initializer = initializer;
3752 }
3753
3754 static void ascend_from_subtype(type_path_t *path)
3755 {
3756         type_path_entry_t *top = get_type_path_top(path);
3757
3758         path->top_type = top->type;
3759
3760         size_t len = ARR_LEN(path->path);
3761         ARR_RESIZE(type_path_entry_t, path->path, len-1);
3762 }
3763
3764 static void walk_designator(type_path_t *path, const designator_t *designator)
3765 {
3766         /* designators start at current object type */
3767         ARR_RESIZE(type_path_entry_t, path->path, 1);
3768
3769         for ( ; designator != NULL; designator = designator->next) {
3770                 type_path_entry_t *top         = get_type_path_top(path);
3771                 type_t            *orig_type   = top->type;
3772                 type_t            *type        = skip_typeref(orig_type);
3773
3774                 if (designator->symbol != NULL) {
3775                         assert(is_type_compound(type));
3776                         size_t    index  = 0;
3777                         symbol_t *symbol = designator->symbol;
3778
3779                         compound_t *compound = type->compound.compound;
3780                         entity_t   *iter     = compound->members.entities;
3781                         for ( ; iter != NULL; iter = iter->base.next, ++index) {
3782                                 if (iter->base.symbol == symbol) {
3783                                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
3784                                         break;
3785                                 }
3786                         }
3787                         assert(iter != NULL);
3788
3789                         /* revert previous initialisations of other union elements */
3790                         if (type->kind == TYPE_COMPOUND_UNION) {
3791                                 ir_initializer_t *initializer = top->initializer;
3792                                 if (initializer != NULL
3793                                         && get_initializer_kind(initializer) == IR_INITIALIZER_COMPOUND) {
3794                                         /* are we writing to a new element? */
3795                                         ir_initializer_t *oldi
3796                                                 = get_initializer_compound_value(initializer, index);
3797                                         if (get_initializer_kind(oldi) == IR_INITIALIZER_NULL) {
3798                                                 /* clear initializer */
3799                                                 size_t len
3800                                                         = get_initializer_compound_n_entries(initializer);
3801                                                 ir_initializer_t *nulli = get_initializer_null();
3802                                                 for (size_t i = 0; i < len; ++i) {
3803                                                         set_initializer_compound_value(initializer, i,
3804                                                                                        nulli);
3805                                                 }
3806                                         }
3807                                 }
3808                         }
3809
3810                         top->type           = orig_type;
3811                         top->compound_entry = iter;
3812                         top->index          = index;
3813                         orig_type           = iter->declaration.type;
3814                 } else {
3815                         expression_t *array_index = designator->array_index;
3816                         assert(designator->array_index != NULL);
3817                         assert(is_type_array(type));
3818
3819                         long index = fold_constant_to_int(array_index);
3820                         assert(index >= 0);
3821 #ifndef NDEBUG
3822                         if (type->array.size_constant) {
3823                                 long array_size = type->array.size;
3824                                 assert(index < array_size);
3825                         }
3826 #endif
3827
3828                         top->type  = orig_type;
3829                         top->index = (size_t) index;
3830                         orig_type  = type->array.element_type;
3831                 }
3832                 path->top_type = orig_type;
3833
3834                 if (designator->next != NULL) {
3835                         descend_into_subtype(path);
3836                 }
3837         }
3838
3839         path->invalid  = false;
3840 }
3841
3842 static void advance_current_object(type_path_t *path)
3843 {
3844         if (path->invalid) {
3845                 /* TODO: handle this... */
3846                 panic("invalid initializer in ast2firm (excessive elements)");
3847         }
3848
3849         type_path_entry_t *top = get_type_path_top(path);
3850
3851         type_t *type = skip_typeref(top->type);
3852         if (is_type_union(type)) {
3853                 /* only the first element is initialized in unions */
3854                 top->compound_entry = NULL;
3855         } else if (is_type_struct(type)) {
3856                 entity_t *entry = top->compound_entry;
3857
3858                 top->index++;
3859                 entry               = skip_unnamed_bitfields(entry->base.next);
3860                 top->compound_entry = entry;
3861                 if (entry != NULL) {
3862                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3863                         path->top_type = entry->declaration.type;
3864                         return;
3865                 }
3866         } else {
3867                 assert(is_type_array(type));
3868
3869                 top->index++;
3870                 if (!type->array.size_constant || top->index < type->array.size) {
3871                         return;
3872                 }
3873         }
3874
3875         /* we're past the last member of the current sub-aggregate, try if we
3876          * can ascend in the type hierarchy and continue with another subobject */
3877         size_t len = ARR_LEN(path->path);
3878
3879         if (len > 1) {
3880                 ascend_from_subtype(path);
3881                 advance_current_object(path);
3882         } else {
3883                 path->invalid = true;
3884         }
3885 }
3886
3887
3888 static ir_initializer_t *create_ir_initializer_value(
3889                 const initializer_value_t *initializer)
3890 {
3891         if (is_type_compound(initializer->value->base.type)) {
3892                 panic("initializer creation for compounds not implemented yet");
3893         }
3894         type_t       *type = initializer->value->base.type;
3895         expression_t *expr = initializer->value;
3896         ir_node *value = expression_to_firm(expr);
3897         ir_mode *mode  = get_ir_mode_storage(type);
3898         value          = create_conv(NULL, value, mode);
3899         return create_initializer_const(value);
3900 }
3901
3902 /** test wether type can be initialized by a string constant */
3903 static bool is_string_type(type_t *type)
3904 {
3905         type_t *inner;
3906         if (is_type_pointer(type)) {
3907                 inner = skip_typeref(type->pointer.points_to);
3908         } else if(is_type_array(type)) {
3909                 inner = skip_typeref(type->array.element_type);
3910         } else {
3911                 return false;
3912         }
3913
3914         return is_type_integer(inner);
3915 }
3916
3917 static ir_initializer_t *create_ir_initializer_list(
3918                 const initializer_list_t *initializer, type_t *type)
3919 {
3920         type_path_t path;
3921         memset(&path, 0, sizeof(path));
3922         path.top_type = type;
3923         path.path     = NEW_ARR_F(type_path_entry_t, 0);
3924
3925         descend_into_subtype(&path);
3926
3927         for (size_t i = 0; i < initializer->len; ++i) {
3928                 const initializer_t *sub_initializer = initializer->initializers[i];
3929
3930                 if (sub_initializer->kind == INITIALIZER_DESIGNATOR) {
3931                         walk_designator(&path, sub_initializer->designator.designator);
3932                         continue;
3933                 }
3934
3935                 if (sub_initializer->kind == INITIALIZER_VALUE) {
3936                         /* we might have to descend into types until we're at a scalar
3937                          * type */
3938                         while(true) {
3939                                 type_t *orig_top_type = path.top_type;
3940                                 type_t *top_type      = skip_typeref(orig_top_type);
3941
3942                                 if (is_type_scalar(top_type))
3943                                         break;
3944                                 descend_into_subtype(&path);
3945                         }
3946                 } else if (sub_initializer->kind == INITIALIZER_STRING
3947                                 || sub_initializer->kind == INITIALIZER_WIDE_STRING) {
3948                         /* we might have to descend into types until we're at a scalar
3949                          * type */
3950                         while (true) {
3951                                 type_t *orig_top_type = path.top_type;
3952                                 type_t *top_type      = skip_typeref(orig_top_type);
3953
3954                                 if (is_string_type(top_type))
3955                                         break;
3956                                 descend_into_subtype(&path);
3957                         }
3958                 }
3959
3960                 ir_initializer_t *sub_irinitializer
3961                         = create_ir_initializer(sub_initializer, path.top_type);
3962
3963                 size_t path_len = ARR_LEN(path.path);
3964                 assert(path_len >= 1);
3965                 type_path_entry_t *entry        = & path.path[path_len-1];
3966                 ir_initializer_t  *tinitializer = entry->initializer;
3967                 set_initializer_compound_value(tinitializer, entry->index,
3968                                                sub_irinitializer);
3969
3970                 advance_current_object(&path);
3971         }
3972
3973         assert(ARR_LEN(path.path) >= 1);
3974         ir_initializer_t *result = path.path[0].initializer;
3975         DEL_ARR_F(path.path);
3976
3977         return result;
3978 }
3979
3980 static ir_initializer_t *create_ir_initializer_string(
3981                 const initializer_string_t *initializer, type_t *type)
3982 {
3983         type = skip_typeref(type);
3984
3985         size_t            string_len    = initializer->string.size;
3986         assert(type->kind == TYPE_ARRAY);
3987         assert(type->array.size_constant);
3988         size_t            len           = type->array.size;
3989         ir_initializer_t *irinitializer = create_initializer_compound(len);
3990
3991         const char *string = initializer->string.begin;
3992         ir_mode    *mode   = get_ir_mode_storage(type->array.element_type);
3993
3994         for (size_t i = 0; i < len; ++i) {
3995                 char c = 0;
3996                 if (i < string_len)
3997                         c = string[i];
3998
3999                 ir_tarval        *tv = new_tarval_from_long(c, mode);
4000                 ir_initializer_t *char_initializer = create_initializer_tarval(tv);
4001
4002                 set_initializer_compound_value(irinitializer, i, char_initializer);
4003         }
4004
4005         return irinitializer;
4006 }
4007
4008 static ir_initializer_t *create_ir_initializer_wide_string(
4009                 const initializer_wide_string_t *initializer, type_t *type)
4010 {
4011         assert(type->kind == TYPE_ARRAY);
4012         assert(type->array.size_constant);
4013         size_t            len           = type->array.size;
4014         size_t            string_len    = wstrlen(&initializer->string);
4015         ir_initializer_t *irinitializer = create_initializer_compound(len);
4016
4017         const char *p    = initializer->string.begin;
4018         ir_mode    *mode = get_type_mode(ir_type_wchar_t);
4019
4020         for (size_t i = 0; i < len; ++i) {
4021                 utf32 c = 0;
4022                 if (i < string_len) {
4023                         c = read_utf8_char(&p);
4024                 }
4025                 ir_tarval *tv = new_tarval_from_long(c, mode);
4026                 ir_initializer_t *char_initializer = create_initializer_tarval(tv);
4027
4028                 set_initializer_compound_value(irinitializer, i, char_initializer);
4029         }
4030
4031         return irinitializer;
4032 }
4033
4034 static ir_initializer_t *create_ir_initializer(
4035                 const initializer_t *initializer, type_t *type)
4036 {
4037         switch(initializer->kind) {
4038                 case INITIALIZER_STRING:
4039                         return create_ir_initializer_string(&initializer->string, type);
4040
4041                 case INITIALIZER_WIDE_STRING:
4042                         return create_ir_initializer_wide_string(&initializer->wide_string,
4043                                                                  type);
4044
4045                 case INITIALIZER_LIST:
4046                         return create_ir_initializer_list(&initializer->list, type);
4047
4048                 case INITIALIZER_VALUE:
4049                         return create_ir_initializer_value(&initializer->value);
4050
4051                 case INITIALIZER_DESIGNATOR:
4052                         panic("unexpected designator initializer found");
4053         }
4054         panic("unknown initializer");
4055 }
4056
4057 /** ANSI C §6.7.8:21: If there are fewer initializers [..] than there
4058  *  are elements [...] the remainder of the aggregate shall be initialized
4059  *  implicitly the same as objects that have static storage duration. */
4060 static void create_dynamic_null_initializer(ir_entity *entity, dbg_info *dbgi,
4061                 ir_node *base_addr)
4062 {
4063         /* for unions we must NOT do anything for null initializers */
4064         ir_type *owner = get_entity_owner(entity);
4065         if (is_Union_type(owner)) {
4066                 return;
4067         }
4068
4069         ir_type *ent_type = get_entity_type(entity);
4070         /* create sub-initializers for a compound type */
4071         if (is_compound_type(ent_type)) {
4072                 unsigned n_members = get_compound_n_members(ent_type);
4073                 for (unsigned n = 0; n < n_members; ++n) {
4074                         ir_entity *member = get_compound_member(ent_type, n);
4075                         ir_node   *addr   = new_d_simpleSel(dbgi, new_NoMem(), base_addr,
4076                                                                 member);
4077                         create_dynamic_null_initializer(member, dbgi, addr);
4078                 }
4079                 return;
4080         }
4081         if (is_Array_type(ent_type)) {
4082                 assert(has_array_upper_bound(ent_type, 0));
4083                 long n = get_array_upper_bound_int(ent_type, 0);
4084                 for (long i = 0; i < n; ++i) {
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                         ir_entity *arrent   = get_array_element_entity(ent_type);
4090                         ir_node   *addr     = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in,
4091                                                         arrent);
4092                         create_dynamic_null_initializer(arrent, dbgi, addr);
4093                 }
4094                 return;
4095         }
4096
4097         ir_mode *value_mode = get_type_mode(ent_type);
4098         ir_node *node       = new_Const(get_mode_null(value_mode));
4099
4100         /* is it a bitfield type? */
4101         if (is_Primitive_type(ent_type) &&
4102                         get_primitive_base_type(ent_type) != NULL) {
4103                 bitfield_store_to_firm(dbgi, entity, base_addr, node, false, false);
4104                 return;
4105         }
4106
4107         ir_node *mem    = get_store();
4108         ir_node *store  = new_d_Store(dbgi, mem, base_addr, node, cons_none);
4109         ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4110         set_store(proj_m);
4111 }
4112
4113 static void create_dynamic_initializer_sub(ir_initializer_t *initializer,
4114                 ir_entity *entity, ir_type *type, dbg_info *dbgi, ir_node *base_addr)
4115 {
4116         switch(get_initializer_kind(initializer)) {
4117         case IR_INITIALIZER_NULL:
4118                 create_dynamic_null_initializer(entity, dbgi, base_addr);
4119                 return;
4120         case IR_INITIALIZER_CONST: {
4121                 ir_node *node     = get_initializer_const_value(initializer);
4122                 ir_type *ent_type = get_entity_type(entity);
4123
4124                 /* is it a bitfield type? */
4125                 if (is_Primitive_type(ent_type) &&
4126                                 get_primitive_base_type(ent_type) != NULL) {
4127                         bitfield_store_to_firm(dbgi, entity, base_addr, node, false, false);
4128                         return;
4129                 }
4130
4131                 assert(get_type_mode(type) == get_irn_mode(node));
4132                 ir_node *mem    = get_store();
4133                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, node, cons_none);
4134                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4135                 set_store(proj_m);
4136                 return;
4137         }
4138         case IR_INITIALIZER_TARVAL: {
4139                 ir_tarval *tv       = get_initializer_tarval_value(initializer);
4140                 ir_node   *cnst     = new_d_Const(dbgi, tv);
4141                 ir_type   *ent_type = get_entity_type(entity);
4142
4143                 /* is it a bitfield type? */
4144                 if (is_Primitive_type(ent_type) &&
4145                                 get_primitive_base_type(ent_type) != NULL) {
4146                         bitfield_store_to_firm(dbgi, entity, base_addr, cnst, false, false);
4147                         return;
4148                 }
4149
4150                 assert(get_type_mode(type) == get_tarval_mode(tv));
4151                 ir_node *mem    = get_store();
4152                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, cnst, cons_none);
4153                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4154                 set_store(proj_m);
4155                 return;
4156         }
4157         case IR_INITIALIZER_COMPOUND: {
4158                 assert(is_compound_type(type) || is_Array_type(type));
4159                 int n_members;
4160                 if (is_Array_type(type)) {
4161                         assert(has_array_upper_bound(type, 0));
4162                         n_members = get_array_upper_bound_int(type, 0);
4163                 } else {
4164                         n_members = get_compound_n_members(type);
4165                 }
4166
4167                 if (get_initializer_compound_n_entries(initializer)
4168                                 != (unsigned) n_members)
4169                         panic("initializer doesn't match compound type");
4170
4171                 for (int i = 0; i < n_members; ++i) {
4172                         ir_node   *addr;
4173                         ir_type   *irtype;
4174                         ir_entity *sub_entity;
4175                         if (is_Array_type(type)) {
4176                                 ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
4177                                 ir_tarval *index_tv = new_tarval_from_long(i, mode_uint);
4178                                 ir_node   *cnst     = new_d_Const(dbgi, index_tv);
4179                                 ir_node   *in[1]    = { cnst };
4180                                 irtype     = get_array_element_type(type);
4181                                 sub_entity = get_array_element_entity(type);
4182                                 addr       = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in,
4183                                                        sub_entity);
4184                         } else {
4185                                 sub_entity = get_compound_member(type, i);
4186                                 irtype     = get_entity_type(sub_entity);
4187                                 addr       = new_d_simpleSel(dbgi, new_NoMem(), base_addr,
4188                                                              sub_entity);
4189                         }
4190
4191                         ir_initializer_t *sub_init
4192                                 = get_initializer_compound_value(initializer, i);
4193
4194                         create_dynamic_initializer_sub(sub_init, sub_entity, irtype, dbgi,
4195                                                        addr);
4196                 }
4197                 return;
4198         }
4199         }
4200
4201         panic("invalid IR_INITIALIZER found");
4202 }
4203
4204 static void create_dynamic_initializer(ir_initializer_t *initializer,
4205                 dbg_info *dbgi, ir_entity *entity)
4206 {
4207         ir_node *frame     = get_irg_frame(current_ir_graph);
4208         ir_node *base_addr = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
4209         ir_type *type      = get_entity_type(entity);
4210
4211         create_dynamic_initializer_sub(initializer, entity, type, dbgi, base_addr);
4212 }
4213
4214 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
4215                                      ir_entity *entity, type_t *type)
4216 {
4217         ir_node *memory = get_store();
4218         ir_node *nomem  = new_NoMem();
4219         ir_node *frame  = get_irg_frame(current_ir_graph);
4220         ir_node *addr   = new_d_simpleSel(dbgi, nomem, frame, entity);
4221
4222         if (initializer->kind == INITIALIZER_VALUE) {
4223                 initializer_value_t *initializer_value = &initializer->value;
4224
4225                 ir_node *value = expression_to_firm(initializer_value->value);
4226                 type = skip_typeref(type);
4227                 assign_value(dbgi, addr, type, value);
4228                 return;
4229         }
4230
4231         if (is_constant_initializer(initializer) == EXPR_CLASS_VARIABLE) {
4232                 ir_initializer_t *irinitializer
4233                         = create_ir_initializer(initializer, type);
4234
4235                 create_dynamic_initializer(irinitializer, dbgi, entity);
4236                 return;
4237         }
4238
4239         /* create a "template" entity which is copied to the entity on the stack */
4240         ir_entity *const init_entity
4241                 = create_initializer_entity(dbgi, initializer, type);
4242         ir_node *const src_addr = create_symconst(dbgi, init_entity);
4243         ir_type *const irtype   = get_ir_type(type);
4244         ir_node *const copyb    = new_d_CopyB(dbgi, memory, addr, src_addr, irtype);
4245
4246         ir_node *const copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
4247         set_store(copyb_mem);
4248 }
4249
4250 static void create_initializer_local_variable_entity(entity_t *entity)
4251 {
4252         assert(entity->kind == ENTITY_VARIABLE);
4253         initializer_t *initializer = entity->variable.initializer;
4254         dbg_info      *dbgi        = get_dbg_info(&entity->base.source_position);
4255         ir_entity     *irentity    = entity->variable.v.entity;
4256         type_t        *type        = entity->declaration.type;
4257
4258         create_local_initializer(initializer, dbgi, irentity, type);
4259 }
4260
4261 static void create_variable_initializer(entity_t *entity)
4262 {
4263         assert(entity->kind == ENTITY_VARIABLE);
4264         initializer_t *initializer = entity->variable.initializer;
4265         if (initializer == NULL)
4266                 return;
4267
4268         declaration_kind_t declaration_kind
4269                 = (declaration_kind_t) entity->declaration.kind;
4270         if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY) {
4271                 create_initializer_local_variable_entity(entity);
4272                 return;
4273         }
4274
4275         type_t            *type = entity->declaration.type;
4276         type_qualifiers_t  tq   = get_type_qualifier(type, true);
4277
4278         if (initializer->kind == INITIALIZER_VALUE) {
4279                 initializer_value_t *initializer_value = &initializer->value;
4280                 dbg_info            *dbgi = get_dbg_info(&entity->base.source_position);
4281                 expression_t        *value     = initializer_value->value;
4282                 type_t              *init_type = skip_typeref(value->base.type);
4283
4284                 if (!is_type_scalar(init_type)) {
4285                         /* skip convs */
4286                         while (value->kind == EXPR_UNARY_CAST)
4287                                 value = value->unary.value;
4288
4289                         if (value->kind != EXPR_COMPOUND_LITERAL)
4290                                 panic("expected non-scalar initializer to be a compound literal");
4291                         initializer = value->compound_literal.initializer;
4292                         goto have_initializer;
4293                 }
4294
4295                 ir_node *node = expression_to_firm(initializer_value->value);
4296
4297                 ir_mode *mode      = get_ir_mode_storage(init_type);
4298                 node = create_conv(dbgi, node, mode);
4299                 node = do_strict_conv(dbgi, node);
4300
4301                 if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE) {
4302                         set_value(entity->variable.v.value_number, node);
4303                 } else {
4304                         assert(declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4305
4306                         ir_entity *irentity = entity->variable.v.entity;
4307
4308                         if (tq & TYPE_QUALIFIER_CONST
4309                                         && get_entity_owner(irentity) != get_tls_type()) {
4310                                 add_entity_linkage(irentity, IR_LINKAGE_CONSTANT);
4311                         }
4312                         set_atomic_ent_value(irentity, node);
4313                 }
4314         } else {
4315 have_initializer:
4316                 assert(declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY ||
4317                        declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4318
4319                 ir_entity        *irentity        = entity->variable.v.entity;
4320                 ir_initializer_t *irinitializer
4321                         = create_ir_initializer(initializer, type);
4322
4323                 if (tq & TYPE_QUALIFIER_CONST) {
4324                         add_entity_linkage(irentity, IR_LINKAGE_CONSTANT);
4325                 }
4326                 set_entity_initializer(irentity, irinitializer);
4327         }
4328 }
4329
4330 static void create_variable_length_array(entity_t *entity)
4331 {
4332         assert(entity->kind == ENTITY_VARIABLE);
4333         assert(entity->variable.initializer == NULL);
4334
4335         entity->declaration.kind    = DECLARATION_KIND_VARIABLE_LENGTH_ARRAY;
4336         entity->variable.v.vla_base = NULL;
4337
4338         /* TODO: record VLA somewhere so we create the free node when we leave
4339          * it's scope */
4340 }
4341
4342 static void allocate_variable_length_array(entity_t *entity)
4343 {
4344         assert(entity->kind == ENTITY_VARIABLE);
4345         assert(entity->variable.initializer == NULL);
4346         assert(currently_reachable());
4347
4348         dbg_info *dbgi      = get_dbg_info(&entity->base.source_position);
4349         type_t   *type      = entity->declaration.type;
4350         ir_type  *el_type   = get_ir_type(type->array.element_type);
4351
4352         /* make sure size_node is calculated */
4353         get_type_size_node(type);
4354         ir_node  *elems = type->array.size_node;
4355         ir_node  *mem   = get_store();
4356         ir_node  *alloc = new_d_Alloc(dbgi, mem, elems, el_type, stack_alloc);
4357
4358         ir_node  *proj_m = new_d_Proj(dbgi, alloc, mode_M, pn_Alloc_M);
4359         ir_node  *addr   = new_d_Proj(dbgi, alloc, mode_P_data, pn_Alloc_res);
4360         set_store(proj_m);
4361
4362         assert(entity->declaration.kind == DECLARATION_KIND_VARIABLE_LENGTH_ARRAY);
4363         entity->variable.v.vla_base = addr;
4364 }
4365
4366 /**
4367  * Creates a Firm local variable from a declaration.
4368  */
4369 static void create_local_variable(entity_t *entity)
4370 {
4371         assert(entity->kind == ENTITY_VARIABLE);
4372         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4373
4374         bool needs_entity = entity->variable.address_taken;
4375         type_t *type = skip_typeref(entity->declaration.type);
4376
4377         /* is it a variable length array? */
4378         if (is_type_array(type) && !type->array.size_constant) {
4379                 create_variable_length_array(entity);
4380                 return;
4381         } else if (is_type_array(type) || is_type_compound(type)) {
4382                 needs_entity = true;
4383         } else if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
4384                 needs_entity = true;
4385         }
4386
4387         if (needs_entity) {
4388                 ir_type *frame_type = get_irg_frame_type(current_ir_graph);
4389                 create_variable_entity(entity,
4390                                        DECLARATION_KIND_LOCAL_VARIABLE_ENTITY,
4391                                        frame_type);
4392         } else {
4393                 entity->declaration.kind        = DECLARATION_KIND_LOCAL_VARIABLE;
4394                 entity->variable.v.value_number = next_value_number_function;
4395                 set_irg_loc_description(current_ir_graph, next_value_number_function,
4396                                         entity);
4397                 ++next_value_number_function;
4398         }
4399 }
4400
4401 static void create_local_static_variable(entity_t *entity)
4402 {
4403         assert(entity->kind == ENTITY_VARIABLE);
4404         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4405
4406         type_t   *type           = skip_typeref(entity->declaration.type);
4407         ir_type  *const var_type = entity->variable.thread_local ?
4408                 get_tls_type() : get_glob_type();
4409         ir_type  *const irtype   = get_ir_type(type);
4410         dbg_info *const dbgi     = get_dbg_info(&entity->base.source_position);
4411
4412         size_t l = strlen(entity->base.symbol->string);
4413         char   buf[l + sizeof(".%u")];
4414         snprintf(buf, sizeof(buf), "%s.%%u", entity->base.symbol->string);
4415         ident     *const id       = id_unique(buf);
4416         ir_entity *const irentity = new_d_entity(var_type, id, irtype, dbgi);
4417
4418         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
4419                 set_entity_volatility(irentity, volatility_is_volatile);
4420         }
4421
4422         entity->declaration.kind  = DECLARATION_KIND_GLOBAL_VARIABLE;
4423         entity->variable.v.entity = irentity;
4424
4425         set_entity_ld_ident(irentity, id);
4426         set_entity_visibility(irentity, ir_visibility_local);
4427
4428         ir_graph *const old_current_ir_graph = current_ir_graph;
4429         current_ir_graph = get_const_code_irg();
4430
4431         create_variable_initializer(entity);
4432
4433         assert(current_ir_graph == get_const_code_irg());
4434         current_ir_graph = old_current_ir_graph;
4435 }
4436
4437
4438
4439 static ir_node *return_statement_to_firm(return_statement_t *statement)
4440 {
4441         if (!currently_reachable())
4442                 return NULL;
4443
4444         dbg_info *const dbgi = get_dbg_info(&statement->base.source_position);
4445         type_t   *const type = skip_typeref(current_function_entity->declaration.type->function.return_type);
4446         ir_node  *      res  = statement->value ? expression_to_firm(statement->value) : NULL;
4447
4448         int in_len;
4449         if (!is_type_void(type)) {
4450                 ir_mode *const mode = get_ir_mode_storage(type);
4451                 if (res) {
4452                         res = create_conv(dbgi, res, mode);
4453                         res = do_strict_conv(dbgi, res);
4454                 } else {
4455                         res = new_Unknown(mode);
4456                 }
4457                 in_len = 1;
4458         } else {
4459                 in_len = 0;
4460         }
4461
4462         ir_node *const in[1] = { res };
4463         ir_node *const store = get_store();
4464         ir_node *const ret   = new_d_Return(dbgi, store, in_len, in);
4465
4466         ir_node *end_block = get_irg_end_block(current_ir_graph);
4467         add_immBlock_pred(end_block, ret);
4468
4469         set_unreachable_now();
4470         return NULL;
4471 }
4472
4473 static ir_node *expression_statement_to_firm(expression_statement_t *statement)
4474 {
4475         if (!currently_reachable())
4476                 return NULL;
4477
4478         return expression_to_firm(statement->expression);
4479 }
4480
4481 static ir_node *compound_statement_to_firm(compound_statement_t *compound)
4482 {
4483         entity_t *entity = compound->scope.entities;
4484         for ( ; entity != NULL; entity = entity->base.next) {
4485                 if (!is_declaration(entity))
4486                         continue;
4487
4488                 create_local_declaration(entity);
4489         }
4490
4491         ir_node     *result    = NULL;
4492         statement_t *statement = compound->statements;
4493         for ( ; statement != NULL; statement = statement->base.next) {
4494                 result = statement_to_firm(statement);
4495         }
4496
4497         return result;
4498 }
4499
4500 static void create_global_variable(entity_t *entity)
4501 {
4502         ir_linkage    linkage    = IR_LINKAGE_DEFAULT;
4503         ir_visibility visibility = ir_visibility_default;
4504         ir_entity    *irentity;
4505         assert(entity->kind == ENTITY_VARIABLE);
4506
4507         switch ((storage_class_tag_t)entity->declaration.storage_class) {
4508         case STORAGE_CLASS_EXTERN: visibility = ir_visibility_external; break;
4509         case STORAGE_CLASS_STATIC: visibility = ir_visibility_local;    break;
4510         case STORAGE_CLASS_NONE:
4511                 visibility = ir_visibility_default;
4512                 /* uninitialized globals get merged in C */
4513                 if (entity->variable.initializer == NULL)
4514                         linkage |= IR_LINKAGE_MERGE;
4515                 break;
4516         case STORAGE_CLASS_TYPEDEF:
4517         case STORAGE_CLASS_AUTO:
4518         case STORAGE_CLASS_REGISTER:
4519                 panic("invalid storage class for global var");
4520         }
4521
4522         ir_type *var_type = get_glob_type();
4523         if (entity->variable.thread_local) {
4524                 var_type = get_tls_type();
4525                 /* LINKAGE_MERGE not supported by current linkers */
4526                 linkage &= ~IR_LINKAGE_MERGE;
4527         }
4528         create_variable_entity(entity, DECLARATION_KIND_GLOBAL_VARIABLE, var_type);
4529         irentity = entity->variable.v.entity;
4530         add_entity_linkage(irentity, linkage);
4531         set_entity_visibility(irentity, visibility);
4532 }
4533
4534 static void create_local_declaration(entity_t *entity)
4535 {
4536         assert(is_declaration(entity));
4537
4538         /* construct type */
4539         (void) get_ir_type(entity->declaration.type);
4540         if (entity->base.symbol == NULL) {
4541                 return;
4542         }
4543
4544         switch ((storage_class_tag_t) entity->declaration.storage_class) {
4545         case STORAGE_CLASS_STATIC:
4546                 if (entity->kind == ENTITY_FUNCTION) {
4547                         (void)get_function_entity(entity, NULL);
4548                 } else {
4549                         create_local_static_variable(entity);
4550                 }
4551                 return;
4552         case STORAGE_CLASS_EXTERN:
4553                 if (entity->kind == ENTITY_FUNCTION) {
4554                         assert(entity->function.statement == NULL);
4555                         (void)get_function_entity(entity, NULL);
4556                 } else {
4557                         create_global_variable(entity);
4558                         create_variable_initializer(entity);
4559                 }
4560                 return;
4561         case STORAGE_CLASS_NONE:
4562         case STORAGE_CLASS_AUTO:
4563         case STORAGE_CLASS_REGISTER:
4564                 if (entity->kind == ENTITY_FUNCTION) {
4565                         if (entity->function.statement != NULL) {
4566                                 ir_type *owner = get_irg_frame_type(current_ir_graph);
4567                                 (void)get_function_entity(entity, owner);
4568                                 entity->declaration.kind = DECLARATION_KIND_INNER_FUNCTION;
4569                                 enqueue_inner_function(entity);
4570                         } else {
4571                                 (void)get_function_entity(entity, NULL);
4572                         }
4573                 } else {
4574                         create_local_variable(entity);
4575                 }
4576                 return;
4577         case STORAGE_CLASS_TYPEDEF:
4578                 break;
4579         }
4580         panic("invalid storage class found");
4581 }
4582
4583 static void initialize_local_declaration(entity_t *entity)
4584 {
4585         if (entity->base.symbol == NULL)
4586                 return;
4587
4588         // no need to emit code in dead blocks
4589         if (entity->declaration.storage_class != STORAGE_CLASS_STATIC
4590                         && !currently_reachable())
4591                 return;
4592
4593         switch ((declaration_kind_t) entity->declaration.kind) {
4594         case DECLARATION_KIND_LOCAL_VARIABLE:
4595         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY:
4596                 create_variable_initializer(entity);
4597                 return;
4598
4599         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
4600                 allocate_variable_length_array(entity);
4601                 return;
4602
4603         case DECLARATION_KIND_COMPOUND_MEMBER:
4604         case DECLARATION_KIND_GLOBAL_VARIABLE:
4605         case DECLARATION_KIND_FUNCTION:
4606         case DECLARATION_KIND_INNER_FUNCTION:
4607                 return;
4608
4609         case DECLARATION_KIND_PARAMETER:
4610         case DECLARATION_KIND_PARAMETER_ENTITY:
4611                 panic("can't initialize parameters");
4612
4613         case DECLARATION_KIND_UNKNOWN:
4614                 panic("can't initialize unknown declaration");
4615         }
4616         panic("invalid declaration kind");
4617 }
4618
4619 static ir_node *declaration_statement_to_firm(declaration_statement_t *statement)
4620 {
4621         entity_t *entity = statement->declarations_begin;
4622         if (entity == NULL)
4623                 return NULL;
4624
4625         entity_t *const last = statement->declarations_end;
4626         for ( ;; entity = entity->base.next) {
4627                 if (is_declaration(entity)) {
4628                         initialize_local_declaration(entity);
4629                 } else if (entity->kind == ENTITY_TYPEDEF) {
4630                         /* §6.7.7:3  Any array size expressions associated with variable length
4631                          * array declarators are evaluated each time the declaration of the
4632                          * typedef name is reached in the order of execution. */
4633                         type_t *const type = skip_typeref(entity->typedefe.type);
4634                         if (is_type_array(type) && type->array.is_vla)
4635                                 get_vla_size(&type->array);
4636                 }
4637                 if (entity == last)
4638                         break;
4639         }
4640
4641         return NULL;
4642 }
4643
4644 static ir_node *if_statement_to_firm(if_statement_t *statement)
4645 {
4646         /* Create the condition. */
4647         ir_node *true_block  = NULL;
4648         ir_node *false_block = NULL;
4649         if (currently_reachable()) {
4650                 true_block  = new_immBlock();
4651                 false_block = new_immBlock();
4652                 create_condition_evaluation(statement->condition, true_block, false_block);
4653                 mature_immBlock(true_block);
4654                 mature_immBlock(false_block);
4655         }
4656
4657         /* Create the true statement. */
4658         set_cur_block(true_block);
4659         statement_to_firm(statement->true_statement);
4660         ir_node *fallthrough_block = get_cur_block();
4661
4662         /* Create the false statement. */
4663         set_cur_block(false_block);
4664         if (statement->false_statement != NULL) {
4665                 statement_to_firm(statement->false_statement);
4666         }
4667
4668         /* Handle the block after the if-statement.  Minor simplification and
4669          * optimisation: Reuse the false/true block as fallthrough block, if the
4670          * true/false statement does not pass control to the fallthrough block, e.g.
4671          * in the typical if (x) return; pattern. */
4672         if (fallthrough_block) {
4673                 if (currently_reachable()) {
4674                         ir_node *const t_jump = new_r_Jmp(fallthrough_block);
4675                         ir_node *const f_jump = new_Jmp();
4676                         ir_node *const in[]   = { t_jump, f_jump };
4677                         fallthrough_block = new_Block(2, in);
4678                 }
4679                 set_cur_block(fallthrough_block);
4680         }
4681
4682         return NULL;
4683 }
4684
4685 /**
4686  * Add an unconditional jump to the target block.  If the source block is not
4687  * reachable, then a Bad predecessor is created to prevent Phi-less unreachable
4688  * loops.  This is necessary if the jump potentially enters a loop.
4689  */
4690 static void jump_to(ir_node *const target_block)
4691 {
4692         ir_node *const pred = currently_reachable() ? new_Jmp() : new_Bad(mode_X);
4693         add_immBlock_pred(target_block, pred);
4694 }
4695
4696 /**
4697  * Add an unconditional jump to the target block, if the current block is
4698  * reachable and do nothing otherwise.  This is only valid if the jump does not
4699  * enter a loop (a back edge is ok).
4700  */
4701 static void jump_if_reachable(ir_node *const target_block)
4702 {
4703         if (currently_reachable())
4704                 add_immBlock_pred(target_block, new_Jmp());
4705 }
4706
4707 static ir_node *while_statement_to_firm(while_statement_t *statement)
4708 {
4709         /* Create the header block */
4710         ir_node *const header_block = new_immBlock();
4711         jump_to(header_block);
4712
4713         /* Create the condition. */
4714         ir_node      *      body_block;
4715         ir_node      *      false_block;
4716         expression_t *const cond = statement->condition;
4717         if (is_constant_expression(cond) == EXPR_CLASS_CONSTANT &&
4718                         fold_constant_to_bool(cond)) {
4719                 /* Shortcut for while (true). */
4720                 body_block  = header_block;
4721                 false_block = NULL;
4722
4723                 keep_alive(header_block);
4724                 keep_all_memory(header_block);
4725         } else {
4726                 body_block  = new_immBlock();
4727                 false_block = new_immBlock();
4728
4729                 set_cur_block(header_block);
4730                 create_condition_evaluation(cond, body_block, false_block);
4731                 mature_immBlock(body_block);
4732         }
4733
4734         ir_node *const old_continue_label = continue_label;
4735         ir_node *const old_break_label    = break_label;
4736         continue_label = header_block;
4737         break_label    = false_block;
4738
4739         /* Create the loop body. */
4740         set_cur_block(body_block);
4741         statement_to_firm(statement->body);
4742         jump_if_reachable(header_block);
4743
4744         mature_immBlock(header_block);
4745         assert(false_block == NULL || false_block == break_label);
4746         false_block = break_label;
4747         if (false_block != NULL) {
4748                 mature_immBlock(false_block);
4749         }
4750         set_cur_block(false_block);
4751
4752         assert(continue_label == header_block);
4753         continue_label = old_continue_label;
4754         break_label    = old_break_label;
4755         return NULL;
4756 }
4757
4758 static ir_node *get_break_label(void)
4759 {
4760         if (break_label == NULL) {
4761                 break_label = new_immBlock();
4762         }
4763         return break_label;
4764 }
4765
4766 static ir_node *do_while_statement_to_firm(do_while_statement_t *statement)
4767 {
4768         /* create the header block */
4769         ir_node *header_block = new_immBlock();
4770
4771         /* the loop body */
4772         ir_node *body_block = new_immBlock();
4773         jump_to(body_block);
4774
4775         ir_node *old_continue_label = continue_label;
4776         ir_node *old_break_label    = break_label;
4777         continue_label              = header_block;
4778         break_label                 = NULL;
4779
4780         set_cur_block(body_block);
4781         statement_to_firm(statement->body);
4782         ir_node *const false_block = get_break_label();
4783
4784         assert(continue_label == header_block);
4785         continue_label = old_continue_label;
4786         break_label    = old_break_label;
4787
4788         jump_if_reachable(header_block);
4789
4790         /* create the condition */
4791         mature_immBlock(header_block);
4792         set_cur_block(header_block);
4793
4794         create_condition_evaluation(statement->condition, body_block, false_block);
4795         mature_immBlock(body_block);
4796         mature_immBlock(false_block);
4797
4798         set_cur_block(false_block);
4799         return NULL;
4800 }
4801
4802 static ir_node *for_statement_to_firm(for_statement_t *statement)
4803 {
4804         /* create declarations */
4805         entity_t *entity = statement->scope.entities;
4806         for ( ; entity != NULL; entity = entity->base.next) {
4807                 if (!is_declaration(entity))
4808                         continue;
4809
4810                 create_local_declaration(entity);
4811         }
4812
4813         if (currently_reachable()) {
4814                 entity = statement->scope.entities;
4815                 for ( ; entity != NULL; entity = entity->base.next) {
4816                         if (!is_declaration(entity))
4817                                 continue;
4818
4819                         initialize_local_declaration(entity);
4820                 }
4821
4822                 if (statement->initialisation != NULL) {
4823                         expression_to_firm(statement->initialisation);
4824                 }
4825         }
4826
4827         /* Create the header block */
4828         ir_node *const header_block = new_immBlock();
4829         jump_to(header_block);
4830
4831         /* Create the condition. */
4832         ir_node *body_block;
4833         ir_node *false_block;
4834         if (statement->condition != NULL) {
4835                 body_block  = new_immBlock();
4836                 false_block = new_immBlock();
4837
4838                 set_cur_block(header_block);
4839                 create_condition_evaluation(statement->condition, body_block, false_block);
4840                 mature_immBlock(body_block);
4841         } else {
4842                 /* for-ever. */
4843                 body_block  = header_block;
4844                 false_block = NULL;
4845
4846                 keep_alive(header_block);
4847                 keep_all_memory(header_block);
4848         }
4849
4850         /* Create the step block, if necessary. */
4851         ir_node      *      step_block = header_block;
4852         expression_t *const step       = statement->step;
4853         if (step != NULL) {
4854                 step_block = new_immBlock();
4855         }
4856
4857         ir_node *const old_continue_label = continue_label;
4858         ir_node *const old_break_label    = break_label;
4859         continue_label = step_block;
4860         break_label    = false_block;
4861
4862         /* Create the loop body. */
4863         set_cur_block(body_block);
4864         statement_to_firm(statement->body);
4865         jump_if_reachable(step_block);
4866
4867         /* Create the step code. */
4868         if (step != NULL) {
4869                 mature_immBlock(step_block);
4870                 set_cur_block(step_block);
4871                 expression_to_firm(step);
4872                 jump_if_reachable(header_block);
4873         }
4874
4875         mature_immBlock(header_block);
4876         assert(false_block == NULL || false_block == break_label);
4877         false_block = break_label;
4878         if (false_block != NULL) {
4879                 mature_immBlock(false_block);
4880         }
4881         set_cur_block(false_block);
4882
4883         assert(continue_label == step_block);
4884         continue_label = old_continue_label;
4885         break_label    = old_break_label;
4886         return NULL;
4887 }
4888
4889 static ir_node *create_jump_statement(const statement_t *statement, ir_node *target_block)
4890 {
4891         if (!currently_reachable())
4892                 return NULL;
4893
4894         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
4895         ir_node  *jump = new_d_Jmp(dbgi);
4896         add_immBlock_pred(target_block, jump);
4897
4898         set_unreachable_now();
4899         return NULL;
4900 }
4901
4902 static ir_switch_table *create_switch_table(const switch_statement_t *statement)
4903 {
4904         /* determine number of cases */
4905         size_t n_cases = 0;
4906         for (case_label_statement_t *l = statement->first_case; l != NULL;
4907              l = l->next) {
4908                 /* default case */
4909                 if (l->expression == NULL)
4910                         continue;
4911                 if (l->is_empty_range)
4912                         continue;
4913                 ++n_cases;
4914         }
4915
4916         ir_switch_table *res = ir_new_switch_table(current_ir_graph, n_cases);
4917         size_t           i   = 0;
4918         for (case_label_statement_t *l = statement->first_case; l != NULL;
4919              l = l->next) {
4920             if (l->expression == NULL) {
4921                         l->pn = pn_Switch_default;
4922                         continue;
4923                 }
4924                 if (l->is_empty_range)
4925                         continue;
4926                 ir_tarval *min = fold_constant_to_tarval(l->expression);
4927                 ir_tarval *max = min;
4928                 long       pn  = (long) i+1;
4929                 if (l->end_range != NULL)
4930                         max = fold_constant_to_tarval(l->end_range);
4931                 ir_switch_table_set(res, i++, min, max, pn);
4932                 l->pn = pn;
4933         }
4934         return res;
4935 }
4936
4937 static ir_node *switch_statement_to_firm(switch_statement_t *statement)
4938 {
4939         dbg_info *dbgi        = get_dbg_info(&statement->base.source_position);
4940         ir_node  *switch_node = NULL;
4941
4942         if (currently_reachable()) {
4943                 ir_node *expression = expression_to_firm(statement->expression);
4944                 ir_switch_table *table = create_switch_table(statement);
4945                 unsigned n_outs = (unsigned)ir_switch_table_get_n_entries(table) + 1;
4946
4947                 switch_node = new_d_Switch(dbgi, expression, n_outs, table);
4948         }
4949
4950         set_unreachable_now();
4951
4952         ir_node *const old_switch            = current_switch;
4953         ir_node *const old_break_label       = break_label;
4954         const bool     old_saw_default_label = saw_default_label;
4955         saw_default_label                    = false;
4956         current_switch                       = switch_node;
4957         break_label                          = NULL;
4958
4959         statement_to_firm(statement->body);
4960
4961         if (currently_reachable()) {
4962                 add_immBlock_pred(get_break_label(), new_Jmp());
4963         }
4964
4965         if (!saw_default_label && switch_node) {
4966                 ir_node *proj = new_d_Proj(dbgi, switch_node, mode_X, pn_Switch_default);
4967                 add_immBlock_pred(get_break_label(), proj);
4968         }
4969
4970         if (break_label != NULL) {
4971                 mature_immBlock(break_label);
4972         }
4973         set_cur_block(break_label);
4974
4975         assert(current_switch == switch_node);
4976         current_switch    = old_switch;
4977         break_label       = old_break_label;
4978         saw_default_label = old_saw_default_label;
4979         return NULL;
4980 }
4981
4982 static ir_node *case_label_to_firm(const case_label_statement_t *statement)
4983 {
4984         if (statement->is_empty_range)
4985                 return NULL;
4986
4987         if (current_switch != NULL) {
4988                 ir_node *block = new_immBlock();
4989                 /* Fallthrough from previous case */
4990                 jump_if_reachable(block);
4991
4992                 ir_node  *const proj = new_Proj(current_switch, mode_X, statement->pn);
4993                 add_immBlock_pred(block, proj);
4994                 if (statement->expression == NULL)
4995                         saw_default_label = true;
4996
4997                 mature_immBlock(block);
4998                 set_cur_block(block);
4999         }
5000
5001         return statement_to_firm(statement->statement);
5002 }
5003
5004 static ir_node *label_to_firm(const label_statement_t *statement)
5005 {
5006         ir_node *block = get_label_block(statement->label);
5007         jump_to(block);
5008
5009         set_cur_block(block);
5010         keep_alive(block);
5011         keep_all_memory(block);
5012
5013         return statement_to_firm(statement->statement);
5014 }
5015
5016 static ir_node *computed_goto_to_firm(computed_goto_statement_t const *const statement)
5017 {
5018         if (!currently_reachable())
5019                 return NULL;
5020
5021         ir_node  *const irn  = expression_to_firm(statement->expression);
5022         dbg_info *const dbgi = get_dbg_info(&statement->base.source_position);
5023         ir_node  *const ijmp = new_d_IJmp(dbgi, irn);
5024
5025         set_irn_link(ijmp, ijmp_list);
5026         ijmp_list = ijmp;
5027
5028         set_unreachable_now();
5029         return NULL;
5030 }
5031
5032 static ir_node *asm_statement_to_firm(const asm_statement_t *statement)
5033 {
5034         bool needs_memory = false;
5035
5036         if (statement->is_volatile) {
5037                 needs_memory = true;
5038         }
5039
5040         size_t         n_clobbers = 0;
5041         asm_clobber_t *clobber    = statement->clobbers;
5042         for ( ; clobber != NULL; clobber = clobber->next) {
5043                 const char *clobber_str = clobber->clobber.begin;
5044
5045                 if (!be_is_valid_clobber(clobber_str)) {
5046                         errorf(&statement->base.source_position,
5047                                    "invalid clobber '%s' specified", clobber->clobber);
5048                         continue;
5049                 }
5050
5051                 if (streq(clobber_str, "memory")) {
5052                         needs_memory = true;
5053                         continue;
5054                 }
5055
5056                 ident *id = new_id_from_str(clobber_str);
5057                 obstack_ptr_grow(&asm_obst, id);
5058                 ++n_clobbers;
5059         }
5060         assert(obstack_object_size(&asm_obst) == n_clobbers * sizeof(ident*));
5061         ident **clobbers = NULL;
5062         if (n_clobbers > 0) {
5063                 clobbers = obstack_finish(&asm_obst);
5064         }
5065
5066         size_t n_inputs  = 0;
5067         asm_argument_t *argument = statement->inputs;
5068         for ( ; argument != NULL; argument = argument->next)
5069                 n_inputs++;
5070         size_t n_outputs = 0;
5071         argument = statement->outputs;
5072         for ( ; argument != NULL; argument = argument->next)
5073                 n_outputs++;
5074
5075         unsigned next_pos = 0;
5076
5077         ir_node *ins[n_inputs + n_outputs + 1];
5078         size_t   in_size = 0;
5079
5080         ir_asm_constraint tmp_in_constraints[n_outputs];
5081
5082         const expression_t *out_exprs[n_outputs];
5083         ir_node            *out_addrs[n_outputs];
5084         size_t              out_size = 0;
5085
5086         argument = statement->outputs;
5087         for ( ; argument != NULL; argument = argument->next) {
5088                 const char *constraints = argument->constraints.begin;
5089                 asm_constraint_flags_t asm_flags
5090                         = be_parse_asm_constraints(constraints);
5091
5092                 {
5093                         source_position_t const *const pos = &statement->base.source_position;
5094                         if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
5095                                 warningf(WARN_OTHER, pos, "some constraints in '%s' are not supported", constraints);
5096                         }
5097                         if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
5098                                 errorf(pos, "some constraints in '%s' are invalid", constraints);
5099                                 continue;
5100                         }
5101                         if (! (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE)) {
5102                                 errorf(pos, "no write flag specified for output constraints '%s'", constraints);
5103                                 continue;
5104                         }
5105                 }
5106
5107                 unsigned pos = next_pos++;
5108                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
5109                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
5110                         expression_t *expr = argument->expression;
5111                         ir_node      *addr = expression_to_addr(expr);
5112                         /* in+output, construct an artifical same_as constraint on the
5113                          * input */
5114                         if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_READ) {
5115                                 char     buf[64];
5116                                 ir_node *value = get_value_from_lvalue(expr, addr);
5117
5118                                 snprintf(buf, sizeof(buf), "%u", (unsigned) out_size);
5119
5120                                 ir_asm_constraint constraint;
5121                                 constraint.pos              = pos;
5122                                 constraint.constraint       = new_id_from_str(buf);
5123                                 constraint.mode             = get_ir_mode_storage(expr->base.type);
5124                                 tmp_in_constraints[in_size] = constraint;
5125                                 ins[in_size] = value;
5126
5127                                 ++in_size;
5128                         }
5129
5130                         out_exprs[out_size] = expr;
5131                         out_addrs[out_size] = addr;
5132                         ++out_size;
5133                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
5134                         /* pure memory ops need no input (but we have to make sure we
5135                          * attach to the memory) */
5136                         assert(! (asm_flags &
5137                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
5138                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
5139                         needs_memory = true;
5140
5141                         /* we need to attach the address to the inputs */
5142                         expression_t *expr = argument->expression;
5143
5144                         ir_asm_constraint constraint;
5145                         constraint.pos              = pos;
5146                         constraint.constraint       = new_id_from_str(constraints);
5147                         constraint.mode             = mode_M;
5148                         tmp_in_constraints[in_size] = constraint;
5149
5150                         ins[in_size]          = expression_to_addr(expr);
5151                         ++in_size;
5152                         continue;
5153                 } else {
5154                         errorf(&statement->base.source_position,
5155                                "only modifiers but no place set in constraints '%s'",
5156                                constraints);
5157                         continue;
5158                 }
5159
5160                 ir_asm_constraint constraint;
5161                 constraint.pos        = pos;
5162                 constraint.constraint = new_id_from_str(constraints);
5163                 constraint.mode       = get_ir_mode_storage(argument->expression->base.type);
5164
5165                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5166         }
5167         assert(obstack_object_size(&asm_obst)
5168                         == out_size * sizeof(ir_asm_constraint));
5169         ir_asm_constraint *output_constraints = obstack_finish(&asm_obst);
5170
5171
5172         obstack_grow(&asm_obst, tmp_in_constraints,
5173                      in_size * sizeof(tmp_in_constraints[0]));
5174         /* find and count input and output arguments */
5175         argument = statement->inputs;
5176         for ( ; argument != NULL; argument = argument->next) {
5177                 const char *constraints = argument->constraints.begin;
5178                 asm_constraint_flags_t asm_flags
5179                         = be_parse_asm_constraints(constraints);
5180
5181                 if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
5182                         errorf(&statement->base.source_position,
5183                                "some constraints in '%s' are not supported", constraints);
5184                         continue;
5185                 }
5186                 if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
5187                         errorf(&statement->base.source_position,
5188                                "some constraints in '%s' are invalid", constraints);
5189                         continue;
5190                 }
5191                 if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE) {
5192                         errorf(&statement->base.source_position,
5193                                "write flag specified for input constraints '%s'",
5194                                constraints);
5195                         continue;
5196                 }
5197
5198                 ir_node *input;
5199                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
5200                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
5201                         /* we can treat this as "normal" input */
5202                         input = expression_to_firm(argument->expression);
5203                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
5204                         /* pure memory ops need no input (but we have to make sure we
5205                          * attach to the memory) */
5206                         assert(! (asm_flags &
5207                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
5208                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
5209                         needs_memory = true;
5210                         input = expression_to_addr(argument->expression);
5211                 } else {
5212                         errorf(&statement->base.source_position,
5213                                "only modifiers but no place set in constraints '%s'",
5214                                constraints);
5215                         continue;
5216                 }
5217
5218                 ir_asm_constraint constraint;
5219                 constraint.pos        = next_pos++;
5220                 constraint.constraint = new_id_from_str(constraints);
5221                 constraint.mode       = get_irn_mode(input);
5222
5223                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5224                 ins[in_size++] = input;
5225         }
5226
5227         if (needs_memory) {
5228                 ir_asm_constraint constraint;
5229                 constraint.pos        = next_pos++;
5230                 constraint.constraint = new_id_from_str("");
5231                 constraint.mode       = mode_M;
5232
5233                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5234                 ins[in_size++] = get_store();
5235         }
5236
5237         assert(obstack_object_size(&asm_obst)
5238                         == in_size * sizeof(ir_asm_constraint));
5239         ir_asm_constraint *input_constraints = obstack_finish(&asm_obst);
5240
5241         /* create asm node */
5242         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
5243
5244         ident *asm_text = new_id_from_str(statement->asm_text.begin);
5245
5246         ir_node *node = new_d_ASM(dbgi, in_size, ins, input_constraints,
5247                                   out_size, output_constraints,
5248                                   n_clobbers, clobbers, asm_text);
5249
5250         if (statement->is_volatile) {
5251                 set_irn_pinned(node, op_pin_state_pinned);
5252         } else {
5253                 set_irn_pinned(node, op_pin_state_floats);
5254         }
5255
5256         /* create output projs & connect them */
5257         if (needs_memory) {
5258                 ir_node *projm = new_Proj(node, mode_M, out_size);
5259                 set_store(projm);
5260         }
5261
5262         size_t i;
5263         for (i = 0; i < out_size; ++i) {
5264                 const expression_t *out_expr = out_exprs[i];
5265                 long                pn       = i;
5266                 ir_mode            *mode     = get_ir_mode_storage(out_expr->base.type);
5267                 ir_node            *proj     = new_Proj(node, mode, pn);
5268                 ir_node            *addr     = out_addrs[i];
5269
5270                 set_value_for_expression_addr(out_expr, proj, addr);
5271         }
5272
5273         return NULL;
5274 }
5275
5276 static ir_node *ms_try_statement_to_firm(ms_try_statement_t *statement)
5277 {
5278         statement_to_firm(statement->try_statement);
5279         source_position_t const *const pos = &statement->base.source_position;
5280         warningf(WARN_OTHER, pos, "structured exception handling ignored");
5281         return NULL;
5282 }
5283
5284 static ir_node *leave_statement_to_firm(leave_statement_t *statement)
5285 {
5286         errorf(&statement->base.source_position, "__leave not supported yet");
5287         return NULL;
5288 }
5289
5290 /**
5291  * Transform a statement.
5292  */
5293 static ir_node *statement_to_firm(statement_t *const stmt)
5294 {
5295 #ifndef NDEBUG
5296         assert(!stmt->base.transformed);
5297         stmt->base.transformed = true;
5298 #endif
5299
5300         switch (stmt->kind) {
5301         case STATEMENT_ASM:           return asm_statement_to_firm(        &stmt->asms);
5302         case STATEMENT_CASE_LABEL:    return case_label_to_firm(           &stmt->case_label);
5303         case STATEMENT_COMPOUND:      return compound_statement_to_firm(   &stmt->compound);
5304         case STATEMENT_COMPUTED_GOTO: return computed_goto_to_firm(        &stmt->computed_goto);
5305         case STATEMENT_DECLARATION:   return declaration_statement_to_firm(&stmt->declaration);
5306         case STATEMENT_DO_WHILE:      return do_while_statement_to_firm(   &stmt->do_while);
5307         case STATEMENT_EMPTY:         return NULL; /* nothing */
5308         case STATEMENT_EXPRESSION:    return expression_statement_to_firm( &stmt->expression);
5309         case STATEMENT_FOR:           return for_statement_to_firm(        &stmt->fors);
5310         case STATEMENT_IF:            return if_statement_to_firm(         &stmt->ifs);
5311         case STATEMENT_LABEL:         return label_to_firm(                &stmt->label);
5312         case STATEMENT_LEAVE:         return leave_statement_to_firm(      &stmt->leave);
5313         case STATEMENT_MS_TRY:        return ms_try_statement_to_firm(     &stmt->ms_try);
5314         case STATEMENT_RETURN:        return return_statement_to_firm(     &stmt->returns);
5315         case STATEMENT_SWITCH:        return switch_statement_to_firm(     &stmt->switchs);
5316         case STATEMENT_WHILE:         return while_statement_to_firm(      &stmt->whiles);
5317
5318         case STATEMENT_BREAK:         return create_jump_statement(stmt, get_break_label());
5319         case STATEMENT_CONTINUE:      return create_jump_statement(stmt, continue_label);
5320         case STATEMENT_GOTO:          return create_jump_statement(stmt, get_label_block(stmt->gotos.label));
5321
5322         case STATEMENT_ERROR: panic("error statement found");
5323         }
5324         panic("statement not implemented");
5325 }
5326
5327 static int count_local_variables(const entity_t *entity,
5328                                  const entity_t *const last)
5329 {
5330         int count = 0;
5331         entity_t const *const end = last != NULL ? last->base.next : NULL;
5332         for (; entity != end; entity = entity->base.next) {
5333                 type_t *type;
5334                 bool    address_taken;
5335
5336                 if (entity->kind == ENTITY_VARIABLE) {
5337                         type          = skip_typeref(entity->declaration.type);
5338                         address_taken = entity->variable.address_taken;
5339                 } else if (entity->kind == ENTITY_PARAMETER) {
5340                         type          = skip_typeref(entity->declaration.type);
5341                         address_taken = entity->parameter.address_taken;
5342                 } else {
5343                         continue;
5344                 }
5345
5346                 if (!address_taken && is_type_scalar(type))
5347                         ++count;
5348         }
5349         return count;
5350 }
5351
5352 static void count_local_variables_in_stmt(statement_t *stmt, void *const env)
5353 {
5354         int *const count = env;
5355
5356         switch (stmt->kind) {
5357         case STATEMENT_DECLARATION: {
5358                 const declaration_statement_t *const decl_stmt = &stmt->declaration;
5359                 *count += count_local_variables(decl_stmt->declarations_begin,
5360                                 decl_stmt->declarations_end);
5361                 break;
5362         }
5363
5364         case STATEMENT_FOR:
5365                 *count += count_local_variables(stmt->fors.scope.entities, NULL);
5366                 break;
5367
5368         default:
5369                 break;
5370         }
5371 }
5372
5373 /**
5374  * Return the number of local (alias free) variables used by a function.
5375  */
5376 static int get_function_n_local_vars(entity_t *entity)
5377 {
5378         const function_t *function = &entity->function;
5379         int count = 0;
5380
5381         /* count parameters */
5382         count += count_local_variables(function->parameters.entities, NULL);
5383
5384         /* count local variables declared in body */
5385         walk_statements(function->statement, count_local_variables_in_stmt, &count);
5386         return count;
5387 }
5388
5389 /**
5390  * Build Firm code for the parameters of a function.
5391  */
5392 static void initialize_function_parameters(entity_t *entity)
5393 {
5394         assert(entity->kind == ENTITY_FUNCTION);
5395         ir_graph *irg             = current_ir_graph;
5396         ir_node  *args            = get_irg_args(irg);
5397         int       n               = 0;
5398         ir_type  *function_irtype;
5399
5400         if (entity->function.need_closure) {
5401                 /* add an extra parameter for the static link */
5402                 entity->function.static_link = new_r_Proj(args, mode_P_data, 0);
5403                 ++n;
5404
5405                 /* Matze: IMO this is wrong, nested functions should have an own
5406                  * type and not rely on strange parameters... */
5407                 function_irtype = create_method_type(&entity->declaration.type->function, true);
5408         } else {
5409                 function_irtype = get_ir_type(entity->declaration.type);
5410         }
5411
5412
5413
5414         entity_t *parameter = entity->function.parameters.entities;
5415         for ( ; parameter != NULL; parameter = parameter->base.next, ++n) {
5416                 if (parameter->kind != ENTITY_PARAMETER)
5417                         continue;
5418
5419                 assert(parameter->declaration.kind == DECLARATION_KIND_UNKNOWN);
5420                 type_t *type = skip_typeref(parameter->declaration.type);
5421
5422                 bool needs_entity = parameter->parameter.address_taken;
5423                 assert(!is_type_array(type));
5424                 if (is_type_compound(type)) {
5425                         needs_entity = true;
5426                 }
5427
5428                 ir_type *param_irtype = get_method_param_type(function_irtype, n);
5429                 if (needs_entity) {
5430                         ir_type   *frame_type = get_irg_frame_type(irg);
5431                         ir_entity *param
5432                                 = new_parameter_entity(frame_type, n, param_irtype);
5433                         parameter->declaration.kind
5434                                 = DECLARATION_KIND_PARAMETER_ENTITY;
5435                         parameter->parameter.v.entity = param;
5436                         continue;
5437                 }
5438
5439                 ir_mode *param_mode = get_type_mode(param_irtype);
5440                 long     pn         = n;
5441                 ir_node *value      = new_r_Proj(args, param_mode, pn);
5442
5443                 ir_mode *mode = get_ir_mode_storage(type);
5444                 value = create_conv(NULL, value, mode);
5445                 value = do_strict_conv(NULL, value);
5446
5447                 parameter->declaration.kind         = DECLARATION_KIND_PARAMETER;
5448                 parameter->parameter.v.value_number = next_value_number_function;
5449                 set_irg_loc_description(current_ir_graph, next_value_number_function,
5450                                         parameter);
5451                 ++next_value_number_function;
5452
5453                 set_value(parameter->parameter.v.value_number, value);
5454         }
5455 }
5456
5457 /**
5458  * Handle additional decl modifiers for IR-graphs
5459  *
5460  * @param irg            the IR-graph
5461  * @param dec_modifiers  additional modifiers
5462  */
5463 static void handle_decl_modifier_irg(ir_graph *irg,
5464                                      decl_modifiers_t decl_modifiers)
5465 {
5466         if (decl_modifiers & DM_NAKED) {
5467                 /* TRUE if the declaration includes the Microsoft
5468                    __declspec(naked) specifier. */
5469                 add_irg_additional_properties(irg, mtp_property_naked);
5470         }
5471         if (decl_modifiers & DM_FORCEINLINE) {
5472                 /* TRUE if the declaration includes the
5473                    Microsoft __forceinline specifier. */
5474                 set_irg_inline_property(irg, irg_inline_forced);
5475         }
5476         if (decl_modifiers & DM_NOINLINE) {
5477                 /* TRUE if the declaration includes the Microsoft
5478                    __declspec(noinline) specifier. */
5479                 set_irg_inline_property(irg, irg_inline_forbidden);
5480         }
5481 }
5482
5483 static void add_function_pointer(ir_type *segment, ir_entity *method,
5484                                  const char *unique_template)
5485 {
5486         ir_type   *method_type  = get_entity_type(method);
5487         ir_type   *ptr_type     = new_type_pointer(method_type);
5488
5489         /* these entities don't really have a name but firm only allows
5490          * "" in ld_ident.
5491          * Note that we mustn't give these entities a name since for example
5492          * Mach-O doesn't allow them. */
5493         ident     *ide          = id_unique(unique_template);
5494         ir_entity *ptr          = new_entity(segment, ide, ptr_type);
5495         ir_graph  *irg          = get_const_code_irg();
5496         ir_node   *val          = new_rd_SymConst_addr_ent(NULL, irg, mode_P_code,
5497                                                            method);
5498
5499         set_entity_ld_ident(ptr, new_id_from_chars("", 0));
5500         set_entity_compiler_generated(ptr, 1);
5501         set_entity_visibility(ptr, ir_visibility_private);
5502         add_entity_linkage(ptr, IR_LINKAGE_CONSTANT|IR_LINKAGE_HIDDEN_USER);
5503         set_atomic_ent_value(ptr, val);
5504 }
5505
5506 /**
5507  * Generate possible IJmp branches to a given label block.
5508  */
5509 static void gen_ijmp_branches(ir_node *block)
5510 {
5511         ir_node *ijmp;
5512         for (ijmp = ijmp_list; ijmp != NULL; ijmp = get_irn_link(ijmp)) {
5513                 add_immBlock_pred(block, ijmp);
5514         }
5515 }
5516
5517 /**
5518  * Create code for a function and all inner functions.
5519  *
5520  * @param entity  the function entity
5521  */
5522 static void create_function(entity_t *entity)
5523 {
5524         assert(entity->kind == ENTITY_FUNCTION);
5525         ir_entity *function_entity = get_function_entity(entity, current_outer_frame);
5526
5527         if (entity->function.statement == NULL)
5528                 return;
5529
5530         inner_functions     = NULL;
5531         current_trampolines = NULL;
5532
5533         if (entity->declaration.modifiers & DM_CONSTRUCTOR) {
5534                 ir_type *segment = get_segment_type(IR_SEGMENT_CONSTRUCTORS);
5535                 add_function_pointer(segment, function_entity, "constructor_ptr.%u");
5536         }
5537         if (entity->declaration.modifiers & DM_DESTRUCTOR) {
5538                 ir_type *segment = get_segment_type(IR_SEGMENT_DESTRUCTORS);
5539                 add_function_pointer(segment, function_entity, "destructor_ptr.%u");
5540         }
5541
5542         current_function_entity = entity;
5543         current_function_name   = NULL;
5544         current_funcsig         = NULL;
5545
5546         assert(all_labels == NULL);
5547         all_labels = NEW_ARR_F(label_t *, 0);
5548         ijmp_list  = NULL;
5549
5550         int       n_local_vars = get_function_n_local_vars(entity);
5551         ir_graph *irg          = new_ir_graph(function_entity, n_local_vars);
5552         current_ir_graph = irg;
5553
5554         ir_graph *old_current_function = current_function;
5555         current_function = irg;
5556
5557         ir_entity *const old_current_vararg_entity = current_vararg_entity;
5558         current_vararg_entity = NULL;
5559
5560         set_irg_fp_model(irg, firm_fp_model);
5561         tarval_enable_fp_ops(1);
5562         set_irn_dbg_info(get_irg_start_block(irg),
5563                          get_entity_dbg_info(function_entity));
5564
5565         /* set inline flags */
5566         if (entity->function.is_inline)
5567                 set_irg_inline_property(irg, irg_inline_recomended);
5568         handle_decl_modifier_irg(irg, entity->declaration.modifiers);
5569
5570         next_value_number_function = 0;
5571         initialize_function_parameters(entity);
5572         current_static_link = entity->function.static_link;
5573
5574         statement_to_firm(entity->function.statement);
5575
5576         ir_node *end_block = get_irg_end_block(irg);
5577
5578         /* do we have a return statement yet? */
5579         if (currently_reachable()) {
5580                 type_t *type = skip_typeref(entity->declaration.type);
5581                 assert(is_type_function(type));
5582                 type_t *const return_type = skip_typeref(type->function.return_type);
5583
5584                 ir_node *ret;
5585                 if (is_type_void(return_type)) {
5586                         ret = new_Return(get_store(), 0, NULL);
5587                 } else {
5588                         ir_mode *const mode = get_ir_mode_storage(return_type);
5589
5590                         ir_node *in[1];
5591                         /* §5.1.2.2.3 main implicitly returns 0 */
5592                         if (is_main(entity)) {
5593                                 in[0] = new_Const(get_mode_null(mode));
5594                         } else {
5595                                 in[0] = new_Unknown(mode);
5596                         }
5597                         ret = new_Return(get_store(), 1, in);
5598                 }
5599                 add_immBlock_pred(end_block, ret);
5600         }
5601
5602         for (int i = ARR_LEN(all_labels) - 1; i >= 0; --i) {
5603                 label_t *label = all_labels[i];
5604                 if (label->address_taken) {
5605                         gen_ijmp_branches(label->block);
5606                 }
5607                 mature_immBlock(label->block);
5608         }
5609
5610         DEL_ARR_F(all_labels);
5611         all_labels = NULL;
5612
5613         irg_finalize_cons(irg);
5614
5615         /* finalize the frame type */
5616         ir_type *frame_type = get_irg_frame_type(irg);
5617         int      n          = get_compound_n_members(frame_type);
5618         int      align_all  = 4;
5619         int      offset     = 0;
5620         for (int i = 0; i < n; ++i) {
5621                 ir_entity *member      = get_compound_member(frame_type, i);
5622                 ir_type   *entity_type = get_entity_type(member);
5623
5624                 int align = get_type_alignment_bytes(entity_type);
5625                 if (align > align_all)
5626                         align_all = align;
5627                 int misalign = 0;
5628                 if (align > 0) {
5629                         misalign  = offset % align;
5630                         if (misalign > 0) {
5631                                 offset += align - misalign;
5632                         }
5633                 }
5634
5635                 set_entity_offset(member, offset);
5636                 offset += get_type_size_bytes(entity_type);
5637         }
5638         set_type_size_bytes(frame_type, offset);
5639         set_type_alignment_bytes(frame_type, align_all);
5640
5641         irg_verify(irg, VERIFY_ENFORCE_SSA);
5642         current_vararg_entity = old_current_vararg_entity;
5643         current_function      = old_current_function;
5644
5645         if (current_trampolines != NULL) {
5646                 DEL_ARR_F(current_trampolines);
5647                 current_trampolines = NULL;
5648         }
5649
5650         /* create inner functions if any */
5651         entity_t **inner = inner_functions;
5652         if (inner != NULL) {
5653                 ir_type *rem_outer_frame      = current_outer_frame;
5654                 current_outer_frame           = get_irg_frame_type(current_ir_graph);
5655                 for (int i = ARR_LEN(inner) - 1; i >= 0; --i) {
5656                         create_function(inner[i]);
5657                 }
5658                 DEL_ARR_F(inner);
5659
5660                 current_outer_frame      = rem_outer_frame;
5661         }
5662 }
5663
5664 static void scope_to_firm(scope_t *scope)
5665 {
5666         /* first pass: create declarations */
5667         entity_t *entity = scope->entities;
5668         for ( ; entity != NULL; entity = entity->base.next) {
5669                 if (entity->base.symbol == NULL)
5670                         continue;
5671
5672                 if (entity->kind == ENTITY_FUNCTION) {
5673                         if (entity->function.btk != BUILTIN_NONE) {
5674                                 /* builtins have no representation */
5675                                 continue;
5676                         }
5677                         (void)get_function_entity(entity, NULL);
5678                 } else if (entity->kind == ENTITY_VARIABLE) {
5679                         create_global_variable(entity);
5680                 } else if (entity->kind == ENTITY_NAMESPACE) {
5681                         scope_to_firm(&entity->namespacee.members);
5682                 }
5683         }
5684
5685         /* second pass: create code/initializers */
5686         entity = scope->entities;
5687         for ( ; entity != NULL; entity = entity->base.next) {
5688                 if (entity->base.symbol == NULL)
5689                         continue;
5690
5691                 if (entity->kind == ENTITY_FUNCTION) {
5692                         if (entity->function.btk != BUILTIN_NONE) {
5693                                 /* builtins have no representation */
5694                                 continue;
5695                         }
5696                         create_function(entity);
5697                 } else if (entity->kind == ENTITY_VARIABLE) {
5698                         assert(entity->declaration.kind
5699                                         == DECLARATION_KIND_GLOBAL_VARIABLE);
5700                         current_ir_graph = get_const_code_irg();
5701                         create_variable_initializer(entity);
5702                 }
5703         }
5704 }
5705
5706 void init_ast2firm(void)
5707 {
5708         obstack_init(&asm_obst);
5709         init_atomic_modes();
5710
5711         ir_set_debug_retrieve(dbg_retrieve);
5712         ir_set_type_debug_retrieve(dbg_print_type_dbg_info);
5713
5714         /* create idents for all known runtime functions */
5715         for (size_t i = 0; i < lengthof(rts_data); ++i) {
5716                 rts_idents[i] = new_id_from_str(rts_data[i].name);
5717         }
5718
5719         entitymap_init(&entitymap);
5720 }
5721
5722 static void init_ir_types(void)
5723 {
5724         static int ir_types_initialized = 0;
5725         if (ir_types_initialized)
5726                 return;
5727         ir_types_initialized = 1;
5728
5729         ir_type_char       = get_ir_type(type_char);
5730         ir_type_const_char = get_ir_type(type_const_char);
5731         ir_type_wchar_t    = get_ir_type(type_wchar_t);
5732
5733         be_params             = be_get_backend_param();
5734         mode_float_arithmetic = be_params->mode_float_arithmetic;
5735
5736         stack_param_align     = be_params->stack_param_align;
5737 }
5738
5739 void exit_ast2firm(void)
5740 {
5741         entitymap_destroy(&entitymap);
5742         obstack_free(&asm_obst, NULL);
5743 }
5744
5745 static void global_asm_to_firm(statement_t *s)
5746 {
5747         for (; s != NULL; s = s->base.next) {
5748                 assert(s->kind == STATEMENT_ASM);
5749
5750                 char const *const text = s->asms.asm_text.begin;
5751                 size_t            size = s->asms.asm_text.size;
5752
5753                 /* skip the last \0 */
5754                 if (text[size - 1] == '\0')
5755                         --size;
5756
5757                 ident *const id = new_id_from_chars(text, size);
5758                 add_irp_asm(id);
5759         }
5760 }
5761
5762 static const char *get_cwd(void)
5763 {
5764         static char buf[1024];
5765         if (buf[0] == '\0')
5766                 getcwd(buf, sizeof(buf));
5767         return buf;
5768 }
5769
5770 void translation_unit_to_firm(translation_unit_t *unit)
5771 {
5772         if (c_mode & _CXX) {
5773                 be_dwarf_set_source_language(DW_LANG_C_plus_plus);
5774         } else if (c_mode & _C99) {
5775                 be_dwarf_set_source_language(DW_LANG_C99);
5776         } else if (c_mode & _C89) {
5777                 be_dwarf_set_source_language(DW_LANG_C89);
5778         } else {
5779                 be_dwarf_set_source_language(DW_LANG_C);
5780         }
5781         be_dwarf_set_compilation_directory(get_cwd());
5782
5783         /* initialize firm arithmetic */
5784         tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
5785         ir_set_uninitialized_local_variable_func(uninitialized_local_var);
5786
5787         /* just to be sure */
5788         continue_label           = NULL;
5789         break_label              = NULL;
5790         current_switch           = NULL;
5791         current_translation_unit = unit;
5792
5793         init_ir_types();
5794
5795         scope_to_firm(&unit->scope);
5796         global_asm_to_firm(unit->global_asm);
5797
5798         current_ir_graph         = NULL;
5799         current_translation_unit = NULL;
5800 }