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 <limits.h>
  26
  27 #include <libfirm/firm.h>
  28 #include <libfirm/adt/obst.h>
  29 #include <libfirm/be.h>
  30
  31 #include "ast2firm.h"
  32
  33 #include "adt/error.h"
  34 #include "adt/array.h"
  35 #include "adt/strutil.h"
  36 #include "adt/util.h"
  37 #include "symbol_t.h"
  38 #include "token_t.h"
  39 #include "type_t.h"
  40 #include "ast_t.h"
  41 #include "entity_t.h"
  42 #include "parser.h"
  43 #include "diagnostic.h"
  44 #include "lang_features.h"
  45 #include "types.h"
  46 #include "type_hash.h"
  47 #include "mangle.h"
  48 #include "walk.h"
  49 #include "warning.h"
  50 #include "printer.h"
  51 #include "entitymap_t.h"
  52 #include "driver/firm_opt.h"
  53
  54 typedef struct trampoline_region trampoline_region;
  55 struct trampoline_region {
  56         ir_entity        *function;    /**< The function that is called by this trampoline */
  57         ir_entity        *region;      /**< created region for the trampoline */
  58 };
  59
  60 fp_model_t firm_fp_model = fp_model_precise;
  61
  62 static const backend_params *be_params;
  63
  64 static ir_type *ir_type_char;
  65 static ir_type *ir_type_const_char;
  66 static ir_type *ir_type_wchar_t;
  67 static ir_type *ir_type_void;
  68 static ir_type *ir_type_int;
  69
  70 /* architecture specific floating point arithmetic mode (if any) */
  71 static ir_mode *mode_float_arithmetic;
  72
  73 /* alignment of stack parameters */
  74 static unsigned stack_param_align;
  75
  76 static int        next_value_number_function;
  77 static ir_node   *continue_label;
  78 static ir_node   *break_label;
  79 static ir_node   *current_switch;
  80 static bool       saw_default_label;
  81 static label_t  **all_labels;
  82 static entity_t **inner_functions;
  83 static ir_node   *ijmp_list;
  84 static bool       constant_folding;
  85
  86 static const entity_t     *current_function_entity;
  87 static ir_node            *current_function_name;
  88 static ir_node            *current_funcsig;
  89 static ir_graph           *current_function;
  90 static translation_unit_t *current_translation_unit;
  91 static trampoline_region  *current_trampolines;
  92 static ir_type            *current_outer_frame;
  93 static ir_node            *current_static_link;
  94 static ir_entity          *current_vararg_entity;
  95
  96 static entitymap_t  entitymap;
  97
  98 static struct obstack asm_obst;
  99
 100 typedef enum declaration_kind_t {
 101         DECLARATION_KIND_UNKNOWN,
 102         DECLARATION_KIND_VARIABLE_LENGTH_ARRAY,
 103         DECLARATION_KIND_GLOBAL_VARIABLE,
 104         DECLARATION_KIND_LOCAL_VARIABLE,
 105         DECLARATION_KIND_LOCAL_VARIABLE_ENTITY,
 106         DECLARATION_KIND_PARAMETER,
 107         DECLARATION_KIND_PARAMETER_ENTITY,
 108         DECLARATION_KIND_FUNCTION,
 109         DECLARATION_KIND_COMPOUND_MEMBER,
 110         DECLARATION_KIND_INNER_FUNCTION
 111 } declaration_kind_t;
 112
 113 static ir_type *get_ir_type_incomplete(type_t *type);
 114
 115 static void enqueue_inner_function(entity_t *entity)
 116 {
 117         if (inner_functions == NULL)
 118                 inner_functions = NEW_ARR_F(entity_t *, 0);
 119         ARR_APP1(entity_t*, inner_functions, entity);
 120 }
 121
 122 static ir_node *uninitialized_local_var(ir_graph *irg, ir_mode *mode, int pos)
 123 {
 124         const entity_t *entity = get_irg_loc_description(irg, pos);
 125
 126         if (entity != NULL) {
 127                 source_position_t const *const pos = &entity->base.source_position;
 128                 warningf(WARN_UNINITIALIZED, pos, "'%N' might be used uninitialized", entity);
 129         }
 130         return new_r_Unknown(irg, mode);
 131 }
 132
 133 static const char *dbg_retrieve(const dbg_info *dbg, unsigned *line)
 134 {
 135         const source_position_t *pos = (const source_position_t*) dbg;
 136         if (pos == NULL)
 137                 return NULL;
 138         if (line != NULL)
 139                 *line = pos->lineno;
 140         return pos->input_name;
 141 }
 142
 143 static dbg_info *get_dbg_info(const source_position_t *pos)
 144 {
 145         return (dbg_info*) pos;
 146 }
 147
 148 static void dbg_print_type_dbg_info(char *buffer, size_t buffer_size,
 149                                     const type_dbg_info *dbg)
 150 {
 151         assert(dbg != NULL);
 152         print_to_buffer(buffer, buffer_size);
 153         const type_t *type = (const type_t*) dbg;
 154         print_type(type);
 155         finish_print_to_buffer();
 156 }
 157
 158 static type_dbg_info *get_type_dbg_info_(const type_t *type)
 159 {
 160         return (type_dbg_info*) type;
 161 }
 162
 163 /* is the current block a reachable one? */
 164 static bool currently_reachable(void)
 165 {
 166         ir_node *const block = get_cur_block();
 167         return block != NULL && !is_Bad(block);
 168 }
 169
 170 static void set_unreachable_now(void)
 171 {
 172         set_cur_block(NULL);
 173 }
 174
 175 ir_mode *atomic_modes[ATOMIC_TYPE_LAST+1];
 176
 177 static ir_node *_expression_to_firm(const expression_t *expression);
 178 static ir_node *expression_to_firm(const expression_t *expression);
 179 static void create_local_declaration(entity_t *entity);
 180
 181 static unsigned decide_modulo_shift(unsigned type_size)
 182 {
 183         if (architecture_modulo_shift == 0)
 184                 return 0;
 185         if (type_size < architecture_modulo_shift)
 186                 return architecture_modulo_shift;
 187         return type_size;
 188 }
 189
 190 static ir_mode *init_atomic_ir_mode(atomic_type_kind_t kind)
 191 {
 192         unsigned flags = get_atomic_type_flags(kind);
 193         unsigned size  = get_atomic_type_size(kind);
 194         if ((flags & ATOMIC_TYPE_FLAG_FLOAT)
 195             && !(flags & ATOMIC_TYPE_FLAG_COMPLEX)) {
 196                 if (size == 4) {
 197                         return get_modeF();
 198                 } else if (size == 8) {
 199                         return get_modeD();
 200                 } else {
 201                         panic("unexpected kind");
 202                 }
 203         } else if (flags & ATOMIC_TYPE_FLAG_INTEGER) {
 204                 char            name[64];
 205                 unsigned        bit_size     = size * 8;
 206                 bool            is_signed    = (flags & ATOMIC_TYPE_FLAG_SIGNED) != 0;
 207                 unsigned        modulo_shift = decide_modulo_shift(bit_size);
 208
 209                 snprintf(name, sizeof(name), "%s%u", is_signed ? "I" : "U", bit_size);
 210                 return new_int_mode(name, irma_twos_complement, bit_size, is_signed,
 211                                     modulo_shift);
 212         }
 213
 214         return NULL;
 215 }
 216
 217 /**
 218  * Initialises the atomic modes depending on the machine size.
 219  */
 220 static void init_atomic_modes(void)
 221 {
 222         atomic_modes[ATOMIC_TYPE_VOID] = mode_ANY;
 223         for (int i = 0; i <= ATOMIC_TYPE_LAST; ++i) {
 224                 if (atomic_modes[i] != NULL)
 225                         continue;
 226                 atomic_modes[i] = init_atomic_ir_mode((atomic_type_kind_t) i);
 227         }
 228 }
 229
 230 ir_mode *get_atomic_mode(atomic_type_kind_t kind)
 231 {
 232         assert(kind <= ATOMIC_TYPE_LAST);
 233         return atomic_modes[kind];
 234 }
 235
 236 static ir_node *get_vla_size(array_type_t *const type)
 237 {
 238         ir_node *size_node = type->size_node;
 239         if (size_node == NULL) {
 240                 size_node = expression_to_firm(type->size_expression);
 241                 type->size_node = size_node;
 242         }
 243         return size_node;
 244 }
 245
 246 static unsigned count_parameters(const function_type_t *function_type)
 247 {
 248         unsigned count = 0;
 249
 250         function_parameter_t *parameter = function_type->parameters;
 251         for ( ; parameter != NULL; parameter = parameter->next) {
 252                 ++count;
 253         }
 254
 255         return count;
 256 }
 257
 258 /**
 259  * Creates a Firm type for an atomic type
 260  */
 261 static ir_type *create_atomic_type(atomic_type_kind_t akind, const type_t *type)
 262 {
 263         ir_mode        *mode      = atomic_modes[akind];
 264         type_dbg_info  *dbgi      = get_type_dbg_info_(type);
 265         ir_type        *irtype    = new_d_type_primitive(mode, dbgi);
 266         il_alignment_t  alignment = get_atomic_type_alignment(akind);
 267
 268         set_type_size_bytes(irtype, get_atomic_type_size(akind));
 269         set_type_alignment_bytes(irtype, alignment);
 270
 271         return irtype;
 272 }
 273
 274 /**
 275  * Creates a Firm type for a complex type
 276  */
 277 static ir_type *create_complex_type(const atomic_type_t *type)
 278 {
 279         atomic_type_kind_t  kind = type->akind;
 280         ir_mode            *mode = atomic_modes[kind];
 281         ident              *id   = get_mode_ident(mode);
 282
 283         (void) id;
 284
 285         /* FIXME: finish the array */
 286         return NULL;
 287 }
 288
 289 /**
 290  * Creates a Firm type for an imaginary type
 291  */
 292 static ir_type *create_imaginary_type(const atomic_type_t *type)
 293 {
 294         return create_atomic_type(type->akind, (const type_t*)type);
 295 }
 296
 297 /**
 298  * return type of a parameter (and take transparent union gnu extension into
 299  * account)
 300  */
 301 static type_t *get_parameter_type(type_t *orig_type)
 302 {
 303         type_t *type = skip_typeref(orig_type);
 304         if (is_type_union(type)
 305                         && get_type_modifiers(orig_type) & DM_TRANSPARENT_UNION) {
 306                 compound_t *compound = type->compound.compound;
 307                 type                 = compound->members.entities->declaration.type;
 308         }
 309
 310         return type;
 311 }
 312
 313 static ir_type *create_method_type(const function_type_t *function_type, bool for_closure)
 314 {
 315         type_t        *return_type  = skip_typeref(function_type->return_type);
 316
 317         int            n_parameters = count_parameters(function_type)
 318                                        + (for_closure ? 1 : 0);
 319         int            n_results    = return_type == type_void ? 0 : 1;
 320         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) function_type);
 321         ir_type       *irtype       = new_d_type_method(n_parameters, n_results, dbgi);
 322
 323         if (return_type != type_void) {
 324                 ir_type *restype = get_ir_type(return_type);
 325                 set_method_res_type(irtype, 0, restype);
 326         }
 327
 328         function_parameter_t *parameter = function_type->parameters;
 329         int                   n         = 0;
 330         if (for_closure) {
 331                 ir_type *p_irtype = get_ir_type(type_void_ptr);
 332                 set_method_param_type(irtype, n, p_irtype);
 333                 ++n;
 334         }
 335         for ( ; parameter != NULL; parameter = parameter->next) {
 336                 type_t  *type     = get_parameter_type(parameter->type);
 337                 ir_type *p_irtype = get_ir_type(type);
 338                 set_method_param_type(irtype, n, p_irtype);
 339                 ++n;
 340         }
 341
 342         bool is_variadic = function_type->variadic;
 343
 344         if (is_variadic)
 345                 set_method_variadicity(irtype, variadicity_variadic);
 346
 347         unsigned cc = get_method_calling_convention(irtype);
 348         switch (function_type->calling_convention) {
 349         case CC_DEFAULT: /* unspecified calling convention, equal to one of the other, typically cdecl */
 350         case CC_CDECL:
 351 is_cdecl:
 352                 set_method_calling_convention(irtype, SET_CDECL(cc));
 353                 break;
 354
 355         case CC_STDCALL:
 356                 if (is_variadic)
 357                         goto is_cdecl;
 358
 359                 /* only non-variadic function can use stdcall, else use cdecl */
 360                 set_method_calling_convention(irtype, SET_STDCALL(cc));
 361                 break;
 362
 363         case CC_FASTCALL:
 364                 if (is_variadic)
 365                         goto is_cdecl;
 366                 /* only non-variadic function can use fastcall, else use cdecl */
 367                 set_method_calling_convention(irtype, SET_FASTCALL(cc));
 368                 break;
 369
 370         case CC_THISCALL:
 371                 /* Hmm, leave default, not accepted by the parser yet. */
 372                 break;
 373         }
 374
 375         if (for_closure)
 376                 set_method_calling_convention(irtype, get_method_calling_convention(irtype) | cc_this_call);
 377
 378         const decl_modifiers_t modifiers = function_type->modifiers;
 379         if (modifiers & DM_CONST)
 380                 add_method_additional_properties(irtype, mtp_property_const);
 381         if (modifiers & DM_PURE)
 382                 add_method_additional_properties(irtype, mtp_property_pure);
 383         if (modifiers & DM_RETURNS_TWICE)
 384                 add_method_additional_properties(irtype, mtp_property_returns_twice);
 385         if (modifiers & DM_NORETURN)
 386                 add_method_additional_properties(irtype, mtp_property_noreturn);
 387         if (modifiers & DM_NOTHROW)
 388                 add_method_additional_properties(irtype, mtp_property_nothrow);
 389         if (modifiers & DM_MALLOC)
 390                 add_method_additional_properties(irtype, mtp_property_malloc);
 391
 392         return irtype;
 393 }
 394
 395 static ir_type *create_pointer_type(pointer_type_t *type)
 396 {
 397         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) type);
 398         type_t        *points_to    = type->points_to;
 399         ir_type       *ir_points_to = get_ir_type_incomplete(points_to);
 400         ir_type       *irtype       = new_d_type_pointer(ir_points_to, dbgi);
 401
 402         return irtype;
 403 }
 404
 405 static ir_type *create_reference_type(reference_type_t *type)
 406 {
 407         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) type);
 408         type_t        *refers_to    = type->refers_to;
 409         ir_type       *ir_refers_to = get_ir_type_incomplete(refers_to);
 410         ir_type       *irtype       = new_d_type_pointer(ir_refers_to, dbgi);
 411
 412         return irtype;
 413 }
 414
 415 static ir_type *create_array_type(array_type_t *type)
 416 {
 417         type_dbg_info *dbgi            = get_type_dbg_info_((const type_t*) type);
 418         type_t        *element_type    = type->element_type;
 419         ir_type       *ir_element_type = get_ir_type(element_type);
 420         ir_type       *irtype          = new_d_type_array(1, ir_element_type, dbgi);
 421
 422         const int align = get_type_alignment_bytes(ir_element_type);
 423         set_type_alignment_bytes(irtype, align);
 424
 425         if (type->size_constant) {
 426                 int n_elements = type->size;
 427
 428                 set_array_bounds_int(irtype, 0, 0, n_elements);
 429
 430                 size_t elemsize = get_type_size_bytes(ir_element_type);
 431                 if (elemsize % align > 0) {
 432                         elemsize += align - (elemsize % align);
 433                 }
 434                 set_type_size_bytes(irtype, n_elements * elemsize);
 435         } else {
 436                 set_array_lower_bound_int(irtype, 0, 0);
 437         }
 438         set_type_state(irtype, layout_fixed);
 439
 440         return irtype;
 441 }
 442
 443 /**
 444  * Return the signed integer type of size bits.
 445  *
 446  * @param size   the size
 447  */
 448 static ir_type *get_signed_int_type_for_bit_size(ir_type *base_tp,
 449                                                  unsigned size,
 450                                                                                                  const type_t *type)
 451 {
 452         static ir_mode *s_modes[64 + 1] = {NULL, };
 453         ir_type *res;
 454         ir_mode *mode;
 455
 456         if (size <= 0 || size > 64)
 457                 return NULL;
 458
 459         mode = s_modes[size];
 460         if (mode == NULL) {
 461                 char name[32];
 462
 463                 snprintf(name, sizeof(name), "bf_I%u", size);
 464                 mode = new_int_mode(name, irma_twos_complement, size, 1, 0);
 465                 s_modes[size] = mode;
 466         }
 467
 468         type_dbg_info *dbgi = get_type_dbg_info_(type);
 469         res                 = new_d_type_primitive(mode, dbgi);
 470         set_primitive_base_type(res, base_tp);
 471
 472         return res;
 473 }
 474
 475 /**
 476  * Return the unsigned integer type of size bits.
 477  *
 478  * @param size   the size
 479  */
 480 static ir_type *get_unsigned_int_type_for_bit_size(ir_type *base_tp,
 481                                                    unsigned size,
 482                                                                                                    const type_t *type)
 483 {
 484         static ir_mode *u_modes[64 + 1] = {NULL, };
 485         ir_type *res;
 486         ir_mode *mode;
 487
 488         if (size <= 0 || size > 64)
 489                 return NULL;
 490
 491         mode = u_modes[size];
 492         if (mode == NULL) {
 493                 char name[32];
 494
 495                 snprintf(name, sizeof(name), "bf_U%u", size);
 496                 mode = new_int_mode(name, irma_twos_complement, size, 0, 0);
 497                 u_modes[size] = mode;
 498         }
 499
 500         type_dbg_info *dbgi = get_type_dbg_info_(type);
 501         res = new_d_type_primitive(mode, dbgi);
 502         set_primitive_base_type(res, base_tp);
 503
 504         return res;
 505 }
 506
 507 static ir_type *create_bitfield_type(const entity_t *entity)
 508 {
 509         assert(entity->kind == ENTITY_COMPOUND_MEMBER);
 510         type_t *base = skip_typeref(entity->declaration.type);
 511         assert(base->kind == TYPE_ATOMIC || base->kind == TYPE_ENUM);
 512         ir_type *irbase = get_ir_type(base);
 513
 514         unsigned bit_size = entity->compound_member.bit_size;
 515
 516         assert(!is_type_float(base));
 517         if (is_type_signed(base)) {
 518                 return get_signed_int_type_for_bit_size(irbase, bit_size, base);
 519         } else {
 520                 return get_unsigned_int_type_for_bit_size(irbase, bit_size, base);
 521         }
 522 }
 523
 524 #define INVALID_TYPE ((ir_type_ptr)-1)
 525
 526 enum {
 527         COMPOUND_IS_STRUCT = false,
 528         COMPOUND_IS_UNION  = true
 529 };
 530
 531 /**
 532  * Construct firm type from ast struct type.
 533  */
 534 static ir_type *create_compound_type(compound_type_t *type,
 535                                      bool incomplete, bool is_union)
 536 {
 537         compound_t *compound = type->compound;
 538
 539         if (compound->irtype != NULL && (compound->irtype_complete || incomplete)) {
 540                 return compound->irtype;
 541         }
 542
 543         symbol_t *type_symbol = compound->base.symbol;
 544         ident    *id;
 545         if (type_symbol != NULL) {
 546                 id = new_id_from_str(type_symbol->string);
 547         } else {
 548                 if (is_union) {
 549                         id = id_unique("__anonymous_union.%u");
 550                 } else {
 551                         id = id_unique("__anonymous_struct.%u");
 552                 }
 553         }
 554
 555         ir_type *irtype;
 556         if (is_union) {
 557                 irtype = new_type_union(id);
 558         } else {
 559                 irtype = new_type_struct(id);
 560         }
 561
 562         compound->irtype_complete = false;
 563         compound->irtype          = irtype;
 564
 565         if (incomplete)
 566                 return irtype;
 567
 568         if (is_union) {
 569                 layout_union_type(type);
 570         } else {
 571                 layout_struct_type(type);
 572         }
 573
 574         compound->irtype_complete = true;
 575
 576         entity_t *entry = compound->members.entities;
 577         for ( ; entry != NULL; entry = entry->base.next) {
 578                 if (entry->kind != ENTITY_COMPOUND_MEMBER)
 579                         continue;
 580
 581                 symbol_t *symbol     = entry->base.symbol;
 582                 type_t   *entry_type = entry->declaration.type;
 583                 ident    *ident;
 584                 if (symbol == NULL) {
 585                         /* anonymous bitfield member, skip */
 586                         if (entry->compound_member.bitfield)
 587                                 continue;
 588                         assert(entry_type->kind == TYPE_COMPOUND_STRUCT
 589                                         || entry_type->kind == TYPE_COMPOUND_UNION);
 590                         ident = id_unique("anon.%u");
 591                 } else {
 592                         ident = new_id_from_str(symbol->string);
 593                 }
 594
 595                 dbg_info *dbgi       = get_dbg_info(&entry->base.source_position);
 596
 597                 ir_type *entry_irtype;
 598                 if (entry->compound_member.bitfield) {
 599                         entry_irtype = create_bitfield_type(entry);
 600                 } else {
 601                         entry_irtype = get_ir_type(entry_type);
 602                 }
 603                 ir_entity *entity = new_d_entity(irtype, ident, entry_irtype, dbgi);
 604
 605                 set_entity_offset(entity, entry->compound_member.offset);
 606                 set_entity_offset_bits_remainder(entity,
 607                                                  entry->compound_member.bit_offset);
 608
 609                 assert(entry->declaration.kind == DECLARATION_KIND_UNKNOWN);
 610                 entry->declaration.kind       = DECLARATION_KIND_COMPOUND_MEMBER;
 611                 entry->compound_member.entity = entity;
 612         }
 613
 614         set_type_alignment_bytes(irtype, compound->alignment);
 615         set_type_size_bytes(irtype, compound->size);
 616         set_type_state(irtype, layout_fixed);
 617
 618         return irtype;
 619 }
 620
 621 static void determine_enum_values(enum_type_t *const type)
 622 {
 623         ir_mode   *const mode    = atomic_modes[type->base.akind];
 624         ir_tarval *const one     = get_mode_one(mode);
 625         ir_tarval *      tv_next = get_mode_null(mode);
 626
 627         bool constant_folding_old = constant_folding;
 628         constant_folding = true;
 629
 630         enum_t   *enume = type->enume;
 631         entity_t *entry = enume->base.next;
 632         for (; entry != NULL; entry = entry->base.next) {
 633                 if (entry->kind != ENTITY_ENUM_VALUE)
 634                         break;
 635
 636                 expression_t *const init = entry->enum_value.value;
 637                 if (init != NULL) {
 638                         ir_node *const cnst = expression_to_firm(init);
 639                         if (!is_Const(cnst)) {
 640                                 panic("couldn't fold constant");
 641                         }
 642                         tv_next = get_Const_tarval(cnst);
 643                 }
 644                 assert(entry->enum_value.tv == NULL || entry->enum_value.tv == tv_next);
 645                 entry->enum_value.tv = tv_next;
 646                 tv_next = tarval_add(tv_next, one);
 647         }
 648
 649         constant_folding = constant_folding_old;
 650 }
 651
 652 static ir_type *create_enum_type(enum_type_t *const type)
 653 {
 654         return create_atomic_type(type->base.akind, (const type_t*) type);
 655 }
 656
 657 static ir_type *get_ir_type_incomplete(type_t *type)
 658 {
 659         assert(type != NULL);
 660         type = skip_typeref(type);
 661
 662         if (type->base.firm_type != NULL) {
 663                 assert(type->base.firm_type != INVALID_TYPE);
 664                 return type->base.firm_type;
 665         }
 666
 667         switch (type->kind) {
 668         case TYPE_COMPOUND_STRUCT:
 669                 return create_compound_type(&type->compound, true, COMPOUND_IS_STRUCT);
 670         case TYPE_COMPOUND_UNION:
 671                 return create_compound_type(&type->compound, true, COMPOUND_IS_UNION);
 672         default:
 673                 return get_ir_type(type);
 674         }
 675 }
 676
 677 ir_type *get_ir_type(type_t *type)
 678 {
 679         assert(type != NULL);
 680
 681         type = skip_typeref(type);
 682
 683         if (type->base.firm_type != NULL) {
 684                 assert(type->base.firm_type != INVALID_TYPE);
 685                 return type->base.firm_type;
 686         }
 687
 688         ir_type *firm_type = NULL;
 689         switch (type->kind) {
 690         case TYPE_ERROR:
 691                 /* Happens while constant folding, when there was an error */
 692                 return create_atomic_type(ATOMIC_TYPE_VOID, NULL);
 693
 694         case TYPE_ATOMIC:
 695                 firm_type = create_atomic_type(type->atomic.akind, type);
 696                 break;
 697         case TYPE_COMPLEX:
 698                 firm_type = create_complex_type(&type->atomic);
 699                 break;
 700         case TYPE_IMAGINARY:
 701                 firm_type = create_imaginary_type(&type->atomic);
 702                 break;
 703         case TYPE_FUNCTION:
 704                 firm_type = create_method_type(&type->function, false);
 705                 break;
 706         case TYPE_POINTER:
 707                 firm_type = create_pointer_type(&type->pointer);
 708                 break;
 709         case TYPE_REFERENCE:
 710                 firm_type = create_reference_type(&type->reference);
 711                 break;
 712         case TYPE_ARRAY:
 713                 firm_type = create_array_type(&type->array);
 714                 break;
 715         case TYPE_COMPOUND_STRUCT:
 716                 firm_type = create_compound_type(&type->compound, false, COMPOUND_IS_STRUCT);
 717                 break;
 718         case TYPE_COMPOUND_UNION:
 719                 firm_type = create_compound_type(&type->compound, false, COMPOUND_IS_UNION);
 720                 break;
 721         case TYPE_ENUM:
 722                 firm_type = create_enum_type(&type->enumt);
 723                 break;
 724
 725         case TYPE_TYPEOF:
 726         case TYPE_TYPEDEF:
 727                 break;
 728         }
 729         if (firm_type == NULL)
 730                 panic("unknown type found");
 731
 732         type->base.firm_type = firm_type;
 733         return firm_type;
 734 }
 735
 736 static ir_mode *get_ir_mode_storage(type_t *type)
 737 {
 738         ir_type *irtype = get_ir_type(type);
 739
 740         /* firm doesn't report a mode for arrays somehow... */
 741         if (is_Array_type(irtype)) {
 742                 return mode_P_data;
 743         }
 744
 745         ir_mode *mode = get_type_mode(irtype);
 746         assert(mode != NULL);
 747         return mode;
 748 }
 749
 750 /*
 751  * get arithmetic mode for a type. This is different from get_ir_mode_storage,
 752  * int that it returns bigger modes for floating point on some platforms
 753  * (x87 internally does arithemtic with 80bits)
 754  */
 755 static ir_mode *get_ir_mode_arithmetic(type_t *type)
 756 {
 757         ir_mode *mode = get_ir_mode_storage(type);
 758         if (mode_is_float(mode) && mode_float_arithmetic != NULL) {
 759                 return mode_float_arithmetic;
 760         }
 761
 762         return mode;
 763 }
 764
 765 /**
 766  * Return a node representing the size of a type.
 767  */
 768 static ir_node *get_type_size_node(type_t *type)
 769 {
 770         unsigned size;
 771         ir_mode *mode = get_ir_mode_arithmetic(type_size_t);
 772         type = skip_typeref(type);
 773
 774         if (is_type_array(type) && type->array.is_vla) {
 775                 ir_node *size_node = get_vla_size(&type->array);
 776                 ir_node *elem_size = get_type_size_node(type->array.element_type);
 777                 ir_node *real_size = new_d_Mul(NULL, size_node, elem_size, mode);
 778                 return real_size;
 779         }
 780
 781         size = get_type_size(type);
 782         return new_Const_long(mode, size);
 783 }
 784
 785 /** Names of the runtime functions. */
 786 static const struct {
 787         int        id;           /**< the rts id */
 788         int        n_res;        /**< number of return values */
 789         const char *name;        /**< the name of the rts function */
 790         int        n_params;     /**< number of parameters */
 791         unsigned   flags;        /**< language flags */
 792 } rts_data[] = {
 793         { rts_debugbreak, 0, "__debugbreak", 0, _MS },
 794         { rts_abort,      0, "abort",        0, _C89 },
 795         { rts_alloca,     1, "alloca",       1, _ALL },
 796         { rts_abs,        1, "abs",          1, _C89 },
 797         { rts_labs,       1, "labs",         1, _C89 },
 798         { rts_llabs,      1, "llabs",        1, _C99 },
 799         { rts_imaxabs,    1, "imaxabs",      1, _C99 },
 800
 801         { rts_fabs,       1, "fabs",         1, _C89 },
 802         { rts_sqrt,       1, "sqrt",         1, _C89 },
 803         { rts_cbrt,       1, "cbrt",         1, _C99 },
 804         { rts_exp,        1, "exp",          1, _C89 },
 805         { rts_exp2,       1, "exp2",         1, _C89 },
 806         { rts_exp10,      1, "exp10",        1, _GNUC },
 807         { rts_log,        1, "log",          1, _C89 },
 808         { rts_log2,       1, "log2",         1, _C89 },
 809         { rts_log10,      1, "log10",        1, _C89 },
 810         { rts_pow,        1, "pow",          2, _C89 },
 811         { rts_sin,        1, "sin",          1, _C89 },
 812         { rts_cos,        1, "cos",          1, _C89 },
 813         { rts_tan,        1, "tan",          1, _C89 },
 814         { rts_asin,       1, "asin",         1, _C89 },
 815         { rts_acos,       1, "acos",         1, _C89 },
 816         { rts_atan,       1, "atan",         1, _C89 },
 817         { rts_sinh,       1, "sinh",         1, _C89 },
 818         { rts_cosh,       1, "cosh",         1, _C89 },
 819         { rts_tanh,       1, "tanh",         1, _C89 },
 820
 821         { rts_fabsf,      1, "fabsf",        1, _C99 },
 822         { rts_sqrtf,      1, "sqrtf",        1, _C99 },
 823         { rts_cbrtf,      1, "cbrtf",        1, _C99 },
 824         { rts_expf,       1, "expf",         1, _C99 },
 825         { rts_exp2f,      1, "exp2f",        1, _C99 },
 826         { rts_exp10f,     1, "exp10f",       1, _GNUC },
 827         { rts_logf,       1, "logf",         1, _C99 },
 828         { rts_log2f,      1, "log2f",        1, _C99 },
 829         { rts_log10f,     1, "log10f",       1, _C99 },
 830         { rts_powf,       1, "powf",         2, _C99 },
 831         { rts_sinf,       1, "sinf",         1, _C99 },
 832         { rts_cosf,       1, "cosf",         1, _C99 },
 833         { rts_tanf,       1, "tanf",         1, _C99 },
 834         { rts_asinf,      1, "asinf",        1, _C99 },
 835         { rts_acosf,      1, "acosf",        1, _C99 },
 836         { rts_atanf,      1, "atanf",        1, _C99 },
 837         { rts_sinhf,      1, "sinhf",        1, _C99 },
 838         { rts_coshf,      1, "coshf",        1, _C99 },
 839         { rts_tanhf,      1, "tanhf",        1, _C99 },
 840
 841         { rts_fabsl,      1, "fabsl",        1, _C99 },
 842         { rts_sqrtl,      1, "sqrtl",        1, _C99 },
 843         { rts_cbrtl,      1, "cbrtl",        1, _C99 },
 844         { rts_expl,       1, "expl",         1, _C99 },
 845         { rts_exp2l,      1, "exp2l",        1, _C99 },
 846         { rts_exp10l,     1, "exp10l",       1, _GNUC },
 847         { rts_logl,       1, "logl",         1, _C99 },
 848         { rts_log2l,      1, "log2l",        1, _C99 },
 849         { rts_log10l,     1, "log10l",       1, _C99 },
 850         { rts_powl,       1, "powl",         2, _C99 },
 851         { rts_sinl,       1, "sinl",         1, _C99 },
 852         { rts_cosl,       1, "cosl",         1, _C99 },
 853         { rts_tanl,       1, "tanl",         1, _C99 },
 854         { rts_asinl,      1, "asinl",        1, _C99 },
 855         { rts_acosl,      1, "acosl",        1, _C99 },
 856         { rts_atanl,      1, "atanl",        1, _C99 },
 857         { rts_sinhl,      1, "sinhl",        1, _C99 },
 858         { rts_coshl,      1, "coshl",        1, _C99 },
 859         { rts_tanhl,      1, "tanhl",        1, _C99 },
 860
 861         { rts_strcmp,     1, "strcmp",       2, _C89 },
 862         { rts_strncmp,    1, "strncmp",      3, _C89 },
 863         { rts_strcpy,     1, "strcpy",       2, _C89 },
 864         { rts_strlen,     1, "strlen",       1, _C89 },
 865         { rts_memcpy,     1, "memcpy",       3, _C89 },
 866         { rts_mempcpy,    1, "mempcpy",      3, _GNUC },
 867         { rts_memmove,    1, "memmove",      3, _C89 },
 868         { rts_memset,     1, "memset",       3, _C89 },
 869         { rts_memcmp,     1, "memcmp",       3, _C89 },
 870 };
 871
 872 static ident *rts_idents[lengthof(rts_data)];
 873
 874 static create_ld_ident_func create_ld_ident = create_name_linux_elf;
 875
 876 void set_create_ld_ident(ident *(*func)(entity_t*))
 877 {
 878         create_ld_ident = func;
 879 }
 880
 881 /**
 882  * Handle GNU attributes for entities
 883  *
 884  * @param ent   the entity
 885  * @param decl  the routine declaration
 886  */
 887 static void handle_decl_modifiers(ir_entity *irentity, entity_t *entity)
 888 {
 889         assert(is_declaration(entity));
 890         decl_modifiers_t modifiers = entity->declaration.modifiers;
 891
 892         if (is_method_entity(irentity)) {
 893                 if (modifiers & DM_PURE) {
 894                         set_entity_additional_properties(irentity, mtp_property_pure);
 895                 }
 896                 if (modifiers & DM_CONST) {
 897                         add_entity_additional_properties(irentity, mtp_property_const);
 898                 }
 899         }
 900         if (modifiers & DM_USED) {
 901                 add_entity_linkage(irentity, IR_LINKAGE_HIDDEN_USER);
 902         }
 903         if (modifiers & DM_WEAK) {
 904                 add_entity_linkage(irentity, IR_LINKAGE_WEAK);
 905         }
 906 }
 907
 908 static bool is_main(entity_t *entity)
 909 {
 910         static symbol_t *sym_main = NULL;
 911         if (sym_main == NULL) {
 912                 sym_main = symbol_table_insert("main");
 913         }
 914
 915         if (entity->base.symbol != sym_main)
 916                 return false;
 917         /* must be in outermost scope */
 918         if (entity->base.parent_scope != &current_translation_unit->scope)
 919                 return false;
 920
 921         return true;
 922 }
 923
 924 /**
 925  * Creates an entity representing a function.
 926  *
 927  * @param entity       the function declaration/definition
 928  * @param owner_type   the owner type of this function, NULL
 929  *                     for global functions
 930  */
 931 static ir_entity *get_function_entity(entity_t *entity, ir_type *owner_type)
 932 {
 933         assert(entity->kind == ENTITY_FUNCTION);
 934         if (entity->function.irentity != NULL)
 935                 return entity->function.irentity;
 936
 937         switch (entity->function.btk) {
 938         case BUILTIN_NONE:
 939         case BUILTIN_LIBC:
 940         case BUILTIN_LIBC_CHECK:
 941                 break;
 942         default:
 943                 return NULL;
 944         }
 945
 946         if (is_main(entity)) {
 947                 /* force main to C linkage */
 948                 type_t *type = entity->declaration.type;
 949                 assert(is_type_function(type));
 950                 if (type->function.linkage != LINKAGE_C) {
 951                         type_t *new_type           = duplicate_type(type);
 952                         new_type->function.linkage = LINKAGE_C;
 953                         type                       = identify_new_type(new_type);
 954                         entity->declaration.type   = type;
 955                 }
 956         }
 957
 958         symbol_t *symbol = entity->base.symbol;
 959         ident    *id     = new_id_from_str(symbol->string);
 960
 961         /* already an entity defined? */
 962         ir_entity *irentity = entitymap_get(&entitymap, symbol);
 963         bool const has_body = entity->function.statement != NULL;
 964         if (irentity != NULL) {
 965                 if (get_entity_visibility(irentity) == ir_visibility_external
 966                                 && has_body) {
 967                         set_entity_visibility(irentity, ir_visibility_default);
 968                 }
 969                 goto entity_created;
 970         }
 971
 972         ir_type *ir_type_method;
 973         if (entity->function.need_closure)
 974                 ir_type_method = create_method_type(&entity->declaration.type->function, true);
 975         else
 976                 ir_type_method = get_ir_type(entity->declaration.type);
 977
 978         bool nested_function = false;
 979         if (owner_type == NULL)
 980                 owner_type = get_glob_type();
 981         else
 982                 nested_function = true;
 983
 984         dbg_info *const dbgi = get_dbg_info(&entity->base.source_position);
 985         irentity = new_d_entity(owner_type, id, ir_type_method, dbgi);
 986
 987         ident *ld_id;
 988         if (nested_function)
 989                 ld_id = id_unique("inner.%u");
 990         else
 991                 ld_id = create_ld_ident(entity);
 992         set_entity_ld_ident(irentity, ld_id);
 993
 994         handle_decl_modifiers(irentity, entity);
 995
 996         if (! nested_function) {
 997                 /* static inline             => local
 998                  * extern inline             => local
 999                  * inline without definition => local
1000                  * inline with definition    => external_visible */
1001                 storage_class_tag_t const storage_class
1002                         = (storage_class_tag_t) entity->declaration.storage_class;
1003                 bool                const is_inline     = entity->function.is_inline;
1004
1005                 if (is_inline && storage_class == STORAGE_CLASS_NONE && has_body) {
1006                     set_entity_visibility(irentity, ir_visibility_default);
1007                 } else if (storage_class == STORAGE_CLASS_STATIC ||
1008                            (is_inline && has_body)) {
1009                     set_entity_visibility(irentity, ir_visibility_local);
1010                 } else if (has_body) {
1011                     set_entity_visibility(irentity, ir_visibility_default);
1012                 } else {
1013                     set_entity_visibility(irentity, ir_visibility_external);
1014                 }
1015         } else {
1016                 /* nested functions are always local */
1017                 set_entity_visibility(irentity, ir_visibility_local);
1018         }
1019
1020         /* We should check for file scope here, but as long as we compile C only
1021            this is not needed. */
1022         if (!freestanding && !has_body) {
1023                 /* check for a known runtime function */
1024                 for (size_t i = 0; i < lengthof(rts_data); ++i) {
1025                         if (id != rts_idents[i])
1026                                 continue;
1027
1028                         function_type_t *function_type
1029                                 = &entity->declaration.type->function;
1030                         /* rts_entities code can't handle a "wrong" number of parameters */
1031                         if (function_type->unspecified_parameters)
1032                                 continue;
1033
1034                         /* check number of parameters */
1035                         int n_params = count_parameters(function_type);
1036                         if (n_params != rts_data[i].n_params)
1037                                 continue;
1038
1039                         type_t *return_type = skip_typeref(function_type->return_type);
1040                         int     n_res       = return_type != type_void ? 1 : 0;
1041                         if (n_res != rts_data[i].n_res)
1042                                 continue;
1043
1044                         /* ignore those rts functions not necessary needed for current mode */
1045                         if ((c_mode & rts_data[i].flags) == 0)
1046                                 continue;
1047                         assert(rts_entities[rts_data[i].id] == NULL);
1048                         rts_entities[rts_data[i].id] = irentity;
1049                 }
1050         }
1051
1052         entitymap_insert(&entitymap, symbol, irentity);
1053
1054 entity_created:
1055         entity->declaration.kind  = DECLARATION_KIND_FUNCTION;
1056         entity->function.irentity = irentity;
1057
1058         return irentity;
1059 }
1060
1061 /**
1062  * Creates a SymConst for a given entity.
1063  *
1064  * @param dbgi    debug info
1065  * @param entity  the entity
1066  */
1067 static ir_node *create_symconst(dbg_info *dbgi, ir_entity *entity)
1068 {
1069         assert(entity != NULL);
1070         union symconst_symbol sym;
1071         sym.entity_p = entity;
1072         return new_d_SymConst(dbgi, mode_P, sym, symconst_addr_ent);
1073 }
1074
1075 static ir_node *create_conv(dbg_info *dbgi, ir_node *value, ir_mode *dest_mode)
1076 {
1077         ir_mode *value_mode = get_irn_mode(value);
1078
1079         if (value_mode == dest_mode)
1080                 return value;
1081
1082         if (dest_mode == mode_b) {
1083                 ir_node *zero = new_Const(get_mode_null(value_mode));
1084                 ir_node *cmp  = new_d_Cmp(dbgi, value, zero, ir_relation_less_greater);
1085                 return cmp;
1086         }
1087
1088         return new_d_Conv(dbgi, value, dest_mode);
1089 }
1090
1091 static ir_node *create_Const_from_bool(ir_mode *const mode, bool const v)
1092 {
1093         return new_Const((v ? get_mode_one : get_mode_null)(mode));
1094 }
1095
1096 /**
1097  * Creates a SymConst node representing a wide string literal.
1098  *
1099  * @param literal   the wide string literal
1100  */
1101 static ir_node *wide_string_literal_to_firm(
1102                 const string_literal_expression_t *literal)
1103 {
1104         ir_type  *const global_type = get_glob_type();
1105         ir_type  *const elem_type   = ir_type_wchar_t;
1106         dbg_info *const dbgi        = get_dbg_info(&literal->base.source_position);
1107         ir_type  *const type        = new_type_array(1, elem_type);
1108
1109         ident     *const id     = id_unique("str.%u");
1110         ir_entity *const entity = new_d_entity(global_type, id, type, dbgi);
1111         set_entity_ld_ident(entity, id);
1112         set_entity_visibility(entity, ir_visibility_private);
1113         add_entity_linkage(entity, IR_LINKAGE_CONSTANT);
1114
1115         ir_mode      *const mode = get_type_mode(elem_type);
1116         const size_t        slen = wstrlen(&literal->value);
1117
1118         set_array_lower_bound_int(type, 0, 0);
1119         set_array_upper_bound_int(type, 0, slen);
1120         set_type_size_bytes(type, slen * get_mode_size_bytes(mode));
1121         set_type_state(type, layout_fixed);
1122
1123         ir_initializer_t *initializer = create_initializer_compound(slen);
1124         const char              *p    = literal->value.begin;
1125         for (size_t i = 0; i < slen; ++i) {
1126                 assert(p < literal->value.begin + literal->value.size);
1127                 utf32             v   = read_utf8_char(&p);
1128                 ir_tarval        *tv  = new_tarval_from_long(v, mode);
1129                 ir_initializer_t *val = create_initializer_tarval(tv);
1130                 set_initializer_compound_value(initializer, i, val);
1131         }
1132         set_entity_initializer(entity, initializer);
1133
1134         return create_symconst(dbgi, entity);
1135 }
1136
1137 /**
1138  * Creates a SymConst node representing a string constant.
1139  *
1140  * @param src_pos    the source position of the string constant
1141  * @param id_prefix  a prefix for the name of the generated string constant
1142  * @param value      the value of the string constant
1143  */
1144 static ir_node *string_to_firm(const source_position_t *const src_pos,
1145                                const char *const id_prefix,
1146                                const string_t *const value)
1147 {
1148         ir_type  *const global_type = get_glob_type();
1149         dbg_info *const dbgi        = get_dbg_info(src_pos);
1150         ir_type  *const type        = new_type_array(1, ir_type_const_char);
1151
1152         ident     *const id     = id_unique(id_prefix);
1153         ir_entity *const entity = new_d_entity(global_type, id, type, dbgi);
1154         set_entity_ld_ident(entity, id);
1155         set_entity_visibility(entity, ir_visibility_private);
1156         add_entity_linkage(entity, IR_LINKAGE_CONSTANT);
1157
1158         ir_type *const elem_type = ir_type_const_char;
1159         ir_mode *const mode      = get_type_mode(elem_type);
1160
1161         const char* const string = value->begin;
1162         const size_t      slen   = value->size;
1163
1164         set_array_lower_bound_int(type, 0, 0);
1165         set_array_upper_bound_int(type, 0, slen);
1166         set_type_size_bytes(type, slen);
1167         set_type_state(type, layout_fixed);
1168
1169         ir_initializer_t *initializer = create_initializer_compound(slen);
1170         for (size_t i = 0; i < slen; ++i) {
1171                 ir_tarval        *tv  = new_tarval_from_long(string[i], mode);
1172                 ir_initializer_t *val = create_initializer_tarval(tv);
1173                 set_initializer_compound_value(initializer, i, val);
1174         }
1175         set_entity_initializer(entity, initializer);
1176
1177         return create_symconst(dbgi, entity);
1178 }
1179
1180 static bool try_create_integer(literal_expression_t *literal,
1181                                type_t *type, unsigned char base)
1182 {
1183         const char *string = literal->value.begin;
1184         size_t      size   = literal->value.size;
1185
1186         assert(type->kind == TYPE_ATOMIC);
1187         atomic_type_kind_t akind = type->atomic.akind;
1188
1189         ir_mode   *mode = atomic_modes[akind];
1190         ir_tarval *tv   = new_integer_tarval_from_str(string, size, 1, base, mode);
1191         if (tv == tarval_bad)
1192                 return false;
1193
1194         literal->base.type    = type;
1195         literal->target_value = tv;
1196         return true;
1197 }
1198
1199 static void create_integer_tarval(literal_expression_t *literal)
1200 {
1201         unsigned        us     = 0;
1202         unsigned        ls     = 0;
1203         const string_t *suffix = &literal->suffix;
1204         /* parse suffix */
1205         if (suffix->size > 0) {
1206                 for (const char *c = suffix->begin; *c != '\0'; ++c) {
1207                         if (*c == 'u' || *c == 'U') { ++us; }
1208                         if (*c == 'l' || *c == 'L') { ++ls; }
1209                 }
1210         }
1211
1212         unsigned base;
1213         switch (literal->base.kind) {
1214                 case EXPR_LITERAL_INTEGER_OCTAL:       base =  8; break;
1215                 case EXPR_LITERAL_INTEGER:             base = 10; break;
1216                 case EXPR_LITERAL_INTEGER_HEXADECIMAL: base = 16; break;
1217                 default: panic("invalid literal kind");
1218         }
1219
1220         tarval_int_overflow_mode_t old_mode = tarval_get_integer_overflow_mode();
1221
1222         /* now try if the constant is small enough for some types */
1223         tarval_set_integer_overflow_mode(TV_OVERFLOW_BAD);
1224         if (ls < 1) {
1225                 if (us == 0 && try_create_integer(literal, type_int, base))
1226                         goto finished;
1227                 if ((us == 1 || base != 10)
1228                                 && try_create_integer(literal, type_unsigned_int, base))
1229                         goto finished;
1230         }
1231         if (ls < 2) {
1232                 if (us == 0 && try_create_integer(literal, type_long, base))
1233                         goto finished;
1234                 if ((us == 1 || base != 10)
1235                                 && try_create_integer(literal, type_unsigned_long, base))
1236                         goto finished;
1237         }
1238         /* last try? then we should not report tarval_bad */
1239         if (us != 1 && base == 10)
1240                 tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
1241         if (us == 0 && try_create_integer(literal, type_long_long, base))
1242                 goto finished;
1243
1244         /* last try */
1245         assert(us == 1 || base != 10);
1246         tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
1247         bool res = try_create_integer(literal, type_unsigned_long_long, base);
1248         if (!res)
1249                 panic("internal error when parsing number literal");
1250
1251 finished:
1252         tarval_set_integer_overflow_mode(old_mode);
1253 }
1254
1255 void determine_literal_type(literal_expression_t *literal)
1256 {
1257         switch (literal->base.kind) {
1258         case EXPR_LITERAL_INTEGER:
1259         case EXPR_LITERAL_INTEGER_OCTAL:
1260         case EXPR_LITERAL_INTEGER_HEXADECIMAL:
1261                 create_integer_tarval(literal);
1262                 return;
1263         default:
1264                 break;
1265         }
1266 }
1267
1268 /**
1269  * Creates a Const node representing a constant.
1270  */
1271 static ir_node *literal_to_firm(const literal_expression_t *literal)
1272 {
1273         type_t     *type   = skip_typeref(literal->base.type);
1274         ir_mode    *mode   = get_ir_mode_storage(type);
1275         const char *string = literal->value.begin;
1276         size_t      size   = literal->value.size;
1277         ir_tarval  *tv;
1278
1279         switch (literal->base.kind) {
1280         case EXPR_LITERAL_WIDE_CHARACTER: {
1281                 utf32  v = read_utf8_char(&string);
1282                 char   buf[128];
1283                 size_t len = snprintf(buf, sizeof(buf), UTF32_PRINTF_FORMAT, v);
1284
1285                 tv = new_tarval_from_str(buf, len, mode);
1286                 goto make_const;
1287         }
1288         case EXPR_LITERAL_CHARACTER: {
1289                 long long int v;
1290                 bool char_is_signed
1291                         = get_atomic_type_flags(ATOMIC_TYPE_CHAR) & ATOMIC_TYPE_FLAG_SIGNED;
1292                 if (size == 1 && char_is_signed) {
1293                         v = (signed char)string[0];
1294                 } else {
1295                         v = 0;
1296                         for (size_t i = 0; i < size; ++i) {
1297                                 v = (v << 8) | ((unsigned char)string[i]);
1298                         }
1299                 }
1300                 char   buf[128];
1301                 size_t len = snprintf(buf, sizeof(buf), "%lld", v);
1302
1303                 tv = new_tarval_from_str(buf, len, mode);
1304                 goto make_const;
1305         }
1306         case EXPR_LITERAL_INTEGER:
1307         case EXPR_LITERAL_INTEGER_OCTAL:
1308         case EXPR_LITERAL_INTEGER_HEXADECIMAL:
1309                 assert(literal->target_value != NULL);
1310                 tv = literal->target_value;
1311                 goto make_const;
1312         case EXPR_LITERAL_FLOATINGPOINT:
1313                 tv = new_tarval_from_str(string, size, mode);
1314                 goto make_const;
1315         case EXPR_LITERAL_FLOATINGPOINT_HEXADECIMAL: {
1316                 char buffer[size + 2];
1317                 memcpy(buffer, "0x", 2);
1318                 memcpy(buffer+2, string, size);
1319                 tv = new_tarval_from_str(buffer, size+2, mode);
1320                 goto make_const;
1321         }
1322         case EXPR_LITERAL_BOOLEAN:
1323                 if (string[0] == 't') {
1324                         tv = get_mode_one(mode);
1325                 } else {
1326                         assert(string[0] == 'f');
1327                         tv = get_mode_null(mode);
1328                 }
1329                 goto make_const;
1330         case EXPR_LITERAL_MS_NOOP:
1331                 tv = get_mode_null(mode);
1332                 goto make_const;
1333         default:
1334                 break;
1335         }
1336         panic("Invalid literal kind found");
1337
1338 make_const: ;
1339         dbg_info *dbgi       = get_dbg_info(&literal->base.source_position);
1340         ir_node  *res        = new_d_Const(dbgi, tv);
1341         ir_mode  *mode_arith = get_ir_mode_arithmetic(type);
1342         return create_conv(dbgi, res, mode_arith);
1343 }
1344
1345 /*
1346  * Allocate an area of size bytes aligned at alignment
1347  * at a frame type.
1348  */
1349 static ir_entity *alloc_trampoline(ir_type *frame_type, int size, unsigned alignment)
1350 {
1351         static unsigned area_cnt = 0;
1352         char buf[32];
1353
1354         ir_type *tp = new_type_array(1, ir_type_char);
1355         set_array_bounds_int(tp, 0, 0, size);
1356         set_type_alignment_bytes(tp, alignment);
1357
1358         snprintf(buf, sizeof(buf), "trampolin%u", area_cnt++);
1359         ident *name = new_id_from_str(buf);
1360         ir_entity *area = new_entity(frame_type, name, tp);
1361
1362         /* mark this entity as compiler generated */
1363         set_entity_compiler_generated(area, 1);
1364         return area;
1365 }
1366
1367 /**
1368  * Return a node representing a trampoline region
1369  * for a given function entity.
1370  *
1371  * @param dbgi    debug info
1372  * @param entity  the function entity
1373  */
1374 static ir_node *get_trampoline_region(dbg_info *dbgi, ir_entity *entity)
1375 {
1376         ir_entity *region = NULL;
1377         int        i;
1378
1379         if (current_trampolines != NULL) {
1380                 for (i = ARR_LEN(current_trampolines) - 1; i >= 0; --i) {
1381                         if (current_trampolines[i].function == entity) {
1382                                 region = current_trampolines[i].region;
1383                                 break;
1384                         }
1385                 }
1386         } else {
1387                 current_trampolines = NEW_ARR_F(trampoline_region, 0);
1388         }
1389         ir_graph *irg = current_ir_graph;
1390         if (region == NULL) {
1391                 /* create a new region */
1392                 ir_type           *frame_tp = get_irg_frame_type(irg);
1393                 trampoline_region  reg;
1394                 reg.function = entity;
1395
1396                 reg.region   = alloc_trampoline(frame_tp,
1397                                                 be_params->trampoline_size,
1398                                                 be_params->trampoline_align);
1399                 ARR_APP1(trampoline_region, current_trampolines, reg);
1400                 region = reg.region;
1401         }
1402         return new_d_simpleSel(dbgi, get_irg_no_mem(irg), get_irg_frame(irg),
1403                                region);
1404 }
1405
1406 /**
1407  * Creates a trampoline for a function represented by an entity.
1408  *
1409  * @param dbgi    debug info
1410  * @param mode    the (reference) mode for the function address
1411  * @param entity  the function entity
1412  */
1413 static ir_node *create_trampoline(dbg_info *dbgi, ir_mode *mode,
1414                                   ir_entity *entity)
1415 {
1416         assert(entity != NULL);
1417         ir_node *in[3];
1418         in[0] = get_trampoline_region(dbgi, entity);
1419         in[1] = create_symconst(dbgi, entity);
1420         in[2] = get_irg_frame(current_ir_graph);
1421
1422         ir_node *irn = new_d_Builtin(dbgi, get_store(), 3, in, ir_bk_inner_trampoline, get_unknown_type());
1423         set_store(new_Proj(irn, mode_M, pn_Builtin_M));
1424         return new_Proj(irn, mode, pn_Builtin_max+1);
1425 }
1426
1427 /**
1428  * Dereference an address.
1429  *
1430  * @param dbgi  debug info
1431  * @param type  the type of the dereferenced result (the points_to type)
1432  * @param addr  the address to dereference
1433  */
1434 static ir_node *deref_address(dbg_info *const dbgi, type_t *const type,
1435                                       ir_node *const addr)
1436 {
1437         type_t *skipped = skip_typeref(type);
1438         if (is_type_incomplete(skipped))
1439                 return addr;
1440
1441         ir_type *irtype = get_ir_type(skipped);
1442         if (is_compound_type(irtype)
1443             || is_Method_type(irtype)
1444             || is_Array_type(irtype)) {
1445                 return addr;
1446         }
1447
1448         ir_cons_flags  flags    = skipped->base.qualifiers & TYPE_QUALIFIER_VOLATILE
1449                                   ? cons_volatile : cons_none;
1450         ir_mode *const mode     = get_type_mode(irtype);
1451         ir_node *const memory   = get_store();
1452         ir_node *const load     = new_d_Load(dbgi, memory, addr, mode, flags);
1453         ir_node *const load_mem = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1454         ir_node *const load_res = new_d_Proj(dbgi, load, mode,   pn_Load_res);
1455
1456         set_store(load_mem);
1457
1458         ir_mode *const mode_arithmetic = get_ir_mode_arithmetic(skipped);
1459         return create_conv(dbgi, load_res, mode_arithmetic);
1460 }
1461
1462 /**
1463  * Creates a strict Conv (to the node's mode) if necessary.
1464  *
1465  * @param dbgi  debug info
1466  * @param node  the node to strict conv
1467  */
1468 static ir_node *do_strict_conv(dbg_info *dbgi, ir_node *node)
1469 {
1470         ir_mode *mode = get_irn_mode(node);
1471
1472         if (!(get_irg_fp_model(current_ir_graph) & fp_explicit_rounding))
1473                 return node;
1474         if (!mode_is_float(mode))
1475                 return node;
1476
1477         /* check if there is already a Conv */
1478         if (is_Conv(node)) {
1479                 /* convert it into a strict Conv */
1480                 set_Conv_strict(node, 1);
1481                 return node;
1482         }
1483
1484         /* otherwise create a new one */
1485         return new_d_strictConv(dbgi, node, mode);
1486 }
1487
1488 /**
1489  * Returns the correct base address depending on whether it is a parameter or a
1490  * normal local variable.
1491  */
1492 static ir_node *get_local_frame(ir_entity *const ent)
1493 {
1494         ir_graph      *const irg   = current_ir_graph;
1495         const ir_type *const owner = get_entity_owner(ent);
1496         if (owner == current_outer_frame) {
1497                 assert(current_static_link != NULL);
1498                 return current_static_link;
1499         } else {
1500                 return get_irg_frame(irg);
1501         }
1502 }
1503
1504 /**
1505  * Keep all memory edges of the given block.
1506  */
1507 static void keep_all_memory(ir_node *block)
1508 {
1509         ir_node *old = get_cur_block();
1510
1511         set_cur_block(block);
1512         keep_alive(get_store());
1513         /* TODO: keep all memory edges from restricted pointers */
1514         set_cur_block(old);
1515 }
1516
1517 static ir_node *reference_expression_enum_value_to_firm(
1518                 const reference_expression_t *ref)
1519 {
1520         entity_t *entity = ref->entity;
1521         if (entity->enum_value.tv == NULL) {
1522                 type_t *type = skip_typeref(entity->enum_value.enum_type);
1523                 assert(type->kind == TYPE_ENUM);
1524                 determine_enum_values(&type->enumt);
1525         }
1526
1527         return new_Const(entity->enum_value.tv);
1528 }
1529
1530 static ir_node *reference_expression_to_firm(const reference_expression_t *ref)
1531 {
1532         dbg_info *dbgi   = get_dbg_info(&ref->base.source_position);
1533         entity_t *entity = ref->entity;
1534         assert(is_declaration(entity));
1535         type_t   *type   = skip_typeref(entity->declaration.type);
1536
1537         /* make sure the type is constructed */
1538         (void) get_ir_type(type);
1539
1540         if (entity->kind == ENTITY_FUNCTION
1541             && entity->function.btk != BUILTIN_NONE) {
1542                 ir_entity *irentity = get_function_entity(entity, NULL);
1543                 /* for gcc compatibility we have to produce (dummy) addresses for some
1544                  * builtins which don't have entities */
1545                 if (irentity == NULL) {
1546                         source_position_t const *const pos = &ref->base.source_position;
1547                         symbol_t          const *const sym = ref->entity->base.symbol;
1548                         warningf(WARN_OTHER, pos, "taking address of builtin '%Y'", sym);
1549
1550                         /* simply create a NULL pointer */
1551                         ir_mode  *mode = get_ir_mode_arithmetic(type_void_ptr);
1552                         ir_node  *res  = new_Const(get_mode_null(mode));
1553
1554                         return res;
1555                 }
1556         }
1557
1558         switch ((declaration_kind_t) entity->declaration.kind) {
1559         case DECLARATION_KIND_UNKNOWN:
1560                 break;
1561
1562         case DECLARATION_KIND_LOCAL_VARIABLE: {
1563                 ir_mode *const mode  = get_ir_mode_storage(type);
1564                 ir_node *const value = get_value(entity->variable.v.value_number, mode);
1565                 return create_conv(NULL, value, get_ir_mode_arithmetic(type));
1566         }
1567         case DECLARATION_KIND_PARAMETER: {
1568                 ir_mode *const mode  = get_ir_mode_storage(type);
1569                 ir_node *const value = get_value(entity->parameter.v.value_number,mode);
1570                 return create_conv(NULL, value, get_ir_mode_arithmetic(type));
1571         }
1572         case DECLARATION_KIND_FUNCTION: {
1573                 return create_symconst(dbgi, entity->function.irentity);
1574         }
1575         case DECLARATION_KIND_INNER_FUNCTION: {
1576                 ir_mode *const mode = get_ir_mode_storage(type);
1577                 if (!entity->function.goto_to_outer && !entity->function.need_closure) {
1578                         /* inner function not using the closure */
1579                         return create_symconst(dbgi, entity->function.irentity);
1580                 } else {
1581                         /* need trampoline here */
1582                         return create_trampoline(dbgi, mode, entity->function.irentity);
1583                 }
1584         }
1585         case DECLARATION_KIND_GLOBAL_VARIABLE: {
1586                 const variable_t *variable = &entity->variable;
1587                 ir_node *const addr = create_symconst(dbgi, variable->v.entity);
1588                 return deref_address(dbgi, variable->base.type, addr);
1589         }
1590
1591         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY: {
1592                 ir_entity *irentity = entity->variable.v.entity;
1593                 ir_node   *frame    = get_local_frame(irentity);
1594                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1595                 return deref_address(dbgi, entity->declaration.type, sel);
1596         }
1597         case DECLARATION_KIND_PARAMETER_ENTITY: {
1598                 ir_entity *irentity = entity->parameter.v.entity;
1599                 ir_node   *frame    = get_local_frame(irentity);
1600                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1601                 return deref_address(dbgi, entity->declaration.type, sel);
1602         }
1603
1604         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
1605                 return entity->variable.v.vla_base;
1606
1607         case DECLARATION_KIND_COMPOUND_MEMBER:
1608                 panic("not implemented reference type");
1609         }
1610
1611         panic("reference to declaration with unknown type found");
1612 }
1613
1614 static ir_node *reference_addr(const reference_expression_t *ref)
1615 {
1616         dbg_info *dbgi   = get_dbg_info(&ref->base.source_position);
1617         entity_t *entity = ref->entity;
1618         assert(is_declaration(entity));
1619
1620         switch((declaration_kind_t) entity->declaration.kind) {
1621         case DECLARATION_KIND_UNKNOWN:
1622                 break;
1623         case DECLARATION_KIND_PARAMETER:
1624         case DECLARATION_KIND_LOCAL_VARIABLE:
1625                 /* you can store to a local variable (so we don't panic but return NULL
1626                  * as an indicator for no real address) */
1627                 return NULL;
1628         case DECLARATION_KIND_GLOBAL_VARIABLE: {
1629                 ir_node *const addr = create_symconst(dbgi, entity->variable.v.entity);
1630                 return addr;
1631         }
1632         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY: {
1633                 ir_entity *irentity = entity->variable.v.entity;
1634                 ir_node   *frame    = get_local_frame(irentity);
1635                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1636
1637                 return sel;
1638         }
1639         case DECLARATION_KIND_PARAMETER_ENTITY: {
1640                 ir_entity *irentity = entity->parameter.v.entity;
1641                 ir_node   *frame    = get_local_frame(irentity);
1642                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1643
1644                 return sel;
1645         }
1646
1647         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
1648                 return entity->variable.v.vla_base;
1649
1650         case DECLARATION_KIND_FUNCTION: {
1651                 return create_symconst(dbgi, entity->function.irentity);
1652         }
1653
1654         case DECLARATION_KIND_INNER_FUNCTION: {
1655                 type_t  *const type = skip_typeref(entity->declaration.type);
1656                 ir_mode *const mode = get_ir_mode_storage(type);
1657                 if (!entity->function.goto_to_outer && !entity->function.need_closure) {
1658                         /* inner function not using the closure */
1659                         return create_symconst(dbgi, entity->function.irentity);
1660                 } else {
1661                         /* need trampoline here */
1662                         return create_trampoline(dbgi, mode, entity->function.irentity);
1663                 }
1664         }
1665
1666         case DECLARATION_KIND_COMPOUND_MEMBER:
1667                 panic("not implemented reference type");
1668         }
1669
1670         panic("reference to declaration with unknown type found");
1671 }
1672
1673 /**
1674  * Transform calls to builtin functions.
1675  */
1676 static ir_node *process_builtin_call(const call_expression_t *call)
1677 {
1678         dbg_info *dbgi = get_dbg_info(&call->base.source_position);
1679
1680         assert(call->function->kind == EXPR_REFERENCE);
1681         reference_expression_t *builtin = &call->function->reference;
1682
1683         type_t *expr_type = skip_typeref(builtin->base.type);
1684         assert(is_type_pointer(expr_type));
1685
1686         type_t *function_type = skip_typeref(expr_type->pointer.points_to);
1687
1688         switch (builtin->entity->function.btk) {
1689         case BUILTIN_NONE:
1690                 break;
1691         case BUILTIN_ALLOCA: {
1692                 expression_t *argument = call->arguments->expression;
1693                 ir_node      *size     = expression_to_firm(argument);
1694
1695                 ir_node *store  = get_store();
1696                 ir_node *alloca = new_d_Alloc(dbgi, store, size, firm_unknown_type,
1697                                               stack_alloc);
1698                 ir_node *proj_m = new_Proj(alloca, mode_M, pn_Alloc_M);
1699                 set_store(proj_m);
1700                 ir_node *res    = new_Proj(alloca, mode_P_data, pn_Alloc_res);
1701
1702                 return res;
1703         }
1704         case BUILTIN_INF: {
1705                 type_t    *type = function_type->function.return_type;
1706                 ir_mode   *mode = get_ir_mode_arithmetic(type);
1707                 ir_tarval *tv   = get_mode_infinite(mode);
1708                 ir_node   *res  = new_d_Const(dbgi, tv);
1709                 return res;
1710         }
1711         case BUILTIN_NAN: {
1712                 /* Ignore string for now... */
1713                 assert(is_type_function(function_type));
1714                 type_t    *type = function_type->function.return_type;
1715                 ir_mode   *mode = get_ir_mode_arithmetic(type);
1716                 ir_tarval *tv   = get_mode_NAN(mode);
1717                 ir_node   *res  = new_d_Const(dbgi, tv);
1718                 return res;
1719         }
1720         case BUILTIN_EXPECT: {
1721                 expression_t *argument = call->arguments->expression;
1722                 return _expression_to_firm(argument);
1723         }
1724         case BUILTIN_VA_END:
1725                 /* evaluate the argument of va_end for its side effects */
1726                 _expression_to_firm(call->arguments->expression);
1727                 return NULL;
1728         case BUILTIN_OBJECT_SIZE: {
1729                 /* determine value of "type" */
1730                 expression_t *type_expression = call->arguments->next->expression;
1731                 long          type_val        = fold_constant_to_int(type_expression);
1732                 type_t       *type            = function_type->function.return_type;
1733                 ir_mode      *mode            = get_ir_mode_arithmetic(type);
1734                 /* just produce a "I don't know" result */
1735                 ir_tarval    *result          = type_val & 2 ? get_mode_null(mode) :
1736                                                 get_mode_minus_one(mode);
1737
1738                 return new_d_Const(dbgi, result);
1739         }
1740         case BUILTIN_ROTL: {
1741                 ir_node *val  = expression_to_firm(call->arguments->expression);
1742                 ir_node *shf  = expression_to_firm(call->arguments->next->expression);
1743                 ir_mode *mode = get_irn_mode(val);
1744                 ir_mode *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1745                 return new_d_Rotl(dbgi, val, create_conv(dbgi, shf, mode_uint), mode);
1746         }
1747         case BUILTIN_ROTR: {
1748                 ir_node *val  = expression_to_firm(call->arguments->expression);
1749                 ir_node *shf  = expression_to_firm(call->arguments->next->expression);
1750                 ir_mode *mode = get_irn_mode(val);
1751                 ir_mode *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1752                 ir_node *c    = new_Const_long(mode_uint, get_mode_size_bits(mode));
1753                 ir_node *sub  = new_d_Sub(dbgi, c, create_conv(dbgi, shf, mode_uint), mode_uint);
1754                 return new_d_Rotl(dbgi, val, sub, mode);
1755         }
1756         case BUILTIN_FIRM:
1757                 break;
1758         case BUILTIN_LIBC:
1759         case BUILTIN_LIBC_CHECK:
1760                 panic("builtin did not produce an entity");
1761         }
1762         panic("invalid builtin found");
1763 }
1764
1765 /**
1766  * Transform a call expression.
1767  * Handles some special cases, like alloca() calls, which must be resolved
1768  * BEFORE the inlines runs. Inlining routines calling alloca() is dangerous,
1769  * 176.gcc for instance might allocate 2GB instead of 256 MB if alloca is not
1770  * handled right...
1771  */
1772 static ir_node *call_expression_to_firm(const call_expression_t *const call)
1773 {
1774         dbg_info *const dbgi = get_dbg_info(&call->base.source_position);
1775         assert(currently_reachable());
1776
1777         expression_t   *function = call->function;
1778         ir_node        *callee   = NULL;
1779         bool            firm_builtin = false;
1780         ir_builtin_kind firm_builtin_kind = ir_bk_trap;
1781         if (function->kind == EXPR_REFERENCE) {
1782                 const reference_expression_t *ref    = &function->reference;
1783                 entity_t                     *entity = ref->entity;
1784
1785                 if (entity->kind == ENTITY_FUNCTION) {
1786                         builtin_kind_t builtin = entity->function.btk;
1787                         if (builtin == BUILTIN_FIRM) {
1788                                 firm_builtin = true;
1789                                 firm_builtin_kind = entity->function.b.firm_builtin_kind;
1790                         } else if (builtin != BUILTIN_NONE && builtin != BUILTIN_LIBC
1791                                    && builtin != BUILTIN_LIBC_CHECK) {
1792                                 return process_builtin_call(call);
1793                         }
1794                 }
1795         }
1796         if (!firm_builtin)
1797                 callee = expression_to_firm(function);
1798
1799         type_t *type = skip_typeref(function->base.type);
1800         assert(is_type_pointer(type));
1801         pointer_type_t *pointer_type = &type->pointer;
1802         type_t         *points_to    = skip_typeref(pointer_type->points_to);
1803         assert(is_type_function(points_to));
1804         function_type_t *function_type = &points_to->function;
1805
1806         int      n_parameters    = 0;
1807         ir_type *ir_method_type  = get_ir_type((type_t*) function_type);
1808         ir_type *new_method_type = NULL;
1809         if (function_type->variadic || function_type->unspecified_parameters) {
1810                 const call_argument_t *argument = call->arguments;
1811                 for ( ; argument != NULL; argument = argument->next) {
1812                         ++n_parameters;
1813                 }
1814
1815                 /* we need to construct a new method type matching the call
1816                  * arguments... */
1817                 type_dbg_info *tdbgi = get_type_dbg_info_((const type_t*) function_type);
1818                 int n_res       = get_method_n_ress(ir_method_type);
1819                 new_method_type = new_d_type_method(n_parameters, n_res, tdbgi);
1820                 set_method_calling_convention(new_method_type,
1821                                get_method_calling_convention(ir_method_type));
1822                 set_method_additional_properties(new_method_type,
1823                                get_method_additional_properties(ir_method_type));
1824                 set_method_variadicity(new_method_type,
1825                                        get_method_variadicity(ir_method_type));
1826
1827                 for (int i = 0; i < n_res; ++i) {
1828                         set_method_res_type(new_method_type, i,
1829                                             get_method_res_type(ir_method_type, i));
1830                 }
1831                 argument = call->arguments;
1832                 for (int i = 0; i < n_parameters; ++i, argument = argument->next) {
1833                         expression_t *expression = argument->expression;
1834                         ir_type      *irtype     = get_ir_type(expression->base.type);
1835                         set_method_param_type(new_method_type, i, irtype);
1836                 }
1837                 ir_method_type = new_method_type;
1838         } else {
1839                 n_parameters = get_method_n_params(ir_method_type);
1840         }
1841
1842         ir_node *in[n_parameters];
1843
1844         const call_argument_t *argument = call->arguments;
1845         for (int n = 0; n < n_parameters; ++n) {
1846                 expression_t *expression = argument->expression;
1847                 ir_node      *arg_node   = expression_to_firm(expression);
1848
1849                 type_t *arg_type = skip_typeref(expression->base.type);
1850                 if (!is_type_compound(arg_type)) {
1851                         ir_mode *mode = get_ir_mode_storage(expression->base.type);
1852                         arg_node      = create_conv(dbgi, arg_node, mode);
1853                         arg_node      = do_strict_conv(dbgi, arg_node);
1854                 }
1855
1856                 in[n] = arg_node;
1857
1858                 argument = argument->next;
1859         }
1860
1861         ir_node *store;
1862         if (function_type->modifiers & DM_CONST) {
1863                 store = get_irg_no_mem(current_ir_graph);
1864         } else {
1865                 store = get_store();
1866         }
1867
1868         ir_node *node;
1869         type_t  *return_type = skip_typeref(function_type->return_type);
1870         ir_node *result      = NULL;
1871         if (firm_builtin) {
1872                 node = new_d_Builtin(dbgi, store, n_parameters, in, firm_builtin_kind,
1873                                      ir_method_type);
1874                 if (! (function_type->modifiers & DM_CONST)) {
1875                         ir_node *mem = new_Proj(node, mode_M, pn_Builtin_M);
1876                         set_store(mem);
1877                 }
1878
1879                 if (!is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
1880                         assert(is_type_scalar(return_type));
1881                         ir_mode *mode = get_ir_mode_storage(return_type);
1882                         result = new_Proj(node, mode, pn_Builtin_max+1);
1883                         ir_mode *mode_arith = get_ir_mode_arithmetic(return_type);
1884                         result              = create_conv(NULL, result, mode_arith);
1885                 }
1886         } else {
1887                 node = new_d_Call(dbgi, store, callee, n_parameters, in, ir_method_type);
1888                 if (! (function_type->modifiers & DM_CONST)) {
1889                         ir_node *mem = new_Proj(node, mode_M, pn_Call_M);
1890                         set_store(mem);
1891                 }
1892
1893                 if (!is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
1894                         ir_node *resproj = new_Proj(node, mode_T, pn_Call_T_result);
1895
1896                         if (is_type_scalar(return_type)) {
1897                                 ir_mode *mode       = get_ir_mode_storage(return_type);
1898                                 result              = new_Proj(resproj, mode, 0);
1899                                 ir_mode *mode_arith = get_ir_mode_arithmetic(return_type);
1900                                 result              = create_conv(NULL, result, mode_arith);
1901                         } else {
1902                                 ir_mode *mode = mode_P_data;
1903                                 result        = new_Proj(resproj, mode, 0);
1904                         }
1905                 }
1906         }
1907
1908         if (function_type->modifiers & DM_NORETURN) {
1909                 /* A dead end:  Keep the Call and the Block.  Also place all further
1910                  * nodes into a new and unreachable block. */
1911                 keep_alive(node);
1912                 keep_alive(get_cur_block());
1913                 ir_node *block = new_Block(0, NULL);
1914                 set_cur_block(block);
1915         }
1916
1917         return result;
1918 }
1919
1920 static void statement_to_firm(statement_t *statement);
1921 static ir_node *compound_statement_to_firm(compound_statement_t *compound);
1922
1923 static ir_node *expression_to_addr(const expression_t *expression);
1924 static ir_node *create_condition_evaluation(const expression_t *expression,
1925                                             ir_node *true_block,
1926                                             ir_node *false_block);
1927
1928 static void assign_value(dbg_info *dbgi, ir_node *addr, type_t *type,
1929                          ir_node *value)
1930 {
1931         if (!is_type_compound(type)) {
1932                 ir_mode *mode = get_ir_mode_storage(type);
1933                 value         = create_conv(dbgi, value, mode);
1934                 value         = do_strict_conv(dbgi, value);
1935         }
1936
1937         ir_node *memory = get_store();
1938
1939         if (is_type_scalar(type)) {
1940                 ir_cons_flags flags = type->base.qualifiers & TYPE_QUALIFIER_VOLATILE
1941                                       ? cons_volatile : cons_none;
1942                 ir_node  *store     = new_d_Store(dbgi, memory, addr, value, flags);
1943                 ir_node  *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
1944                 set_store(store_mem);
1945         } else {
1946                 ir_type *irtype    = get_ir_type(type);
1947                 ir_node *copyb     = new_d_CopyB(dbgi, memory, addr, value, irtype);
1948                 ir_node *copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
1949                 set_store(copyb_mem);
1950         }
1951 }
1952
1953 static ir_tarval *create_bitfield_mask(ir_mode *mode, int offset, int size)
1954 {
1955         ir_tarval *all_one   = get_mode_all_one(mode);
1956         int        mode_size = get_mode_size_bits(mode);
1957         ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1958
1959         assert(offset >= 0);
1960         assert(size   >= 0);
1961         assert(offset + size <= mode_size);
1962         if (size == mode_size) {
1963                 return all_one;
1964         }
1965
1966         long       shiftr    = get_mode_size_bits(mode) - size;
1967         long       shiftl    = offset;
1968         ir_tarval *tv_shiftr = new_tarval_from_long(shiftr, mode_uint);
1969         ir_tarval *tv_shiftl = new_tarval_from_long(shiftl, mode_uint);
1970         ir_tarval *mask0     = tarval_shr(all_one, tv_shiftr);
1971         ir_tarval *mask1     = tarval_shl(mask0, tv_shiftl);
1972
1973         return mask1;
1974 }
1975
1976 static ir_node *bitfield_store_to_firm(dbg_info *dbgi,
1977                 ir_entity *entity, ir_node *addr, ir_node *value, bool set_volatile,
1978                 bool need_return)
1979 {
1980         ir_type *entity_type = get_entity_type(entity);
1981         ir_type *base_type   = get_primitive_base_type(entity_type);
1982         ir_mode *mode        = get_type_mode(base_type);
1983         ir_mode *mode_uint   = atomic_modes[ATOMIC_TYPE_UINT];
1984
1985         value = create_conv(dbgi, value, mode);
1986
1987         /* kill upper bits of value and shift to right position */
1988         unsigned  bitoffset  = get_entity_offset_bits_remainder(entity);
1989         unsigned  bitsize    = get_mode_size_bits(get_type_mode(entity_type));
1990         unsigned  base_bits  = get_mode_size_bits(mode);
1991         unsigned  shiftwidth = base_bits - bitsize;
1992
1993         ir_node  *shiftcount = new_Const_long(mode_uint, shiftwidth);
1994         ir_node  *shiftl     = new_d_Shl(dbgi, value, shiftcount, mode);
1995
1996         unsigned  shrwidth   = base_bits - bitsize - bitoffset;
1997         ir_node  *shrconst   = new_Const_long(mode_uint, shrwidth);
1998         ir_node  *shiftr     = new_d_Shr(dbgi, shiftl, shrconst, mode);
1999
2000         /* load current value */
2001         ir_node   *mem             = get_store();
2002         ir_node   *load            = new_d_Load(dbgi, mem, addr, mode,
2003                                           set_volatile ? cons_volatile : cons_none);
2004         ir_node   *load_mem        = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
2005         ir_node   *load_res        = new_d_Proj(dbgi, load, mode, pn_Load_res);
2006         ir_tarval *shift_mask      = create_bitfield_mask(mode, bitoffset, bitsize);
2007         ir_tarval *inv_mask        = tarval_not(shift_mask);
2008         ir_node   *inv_mask_node   = new_d_Const(dbgi, inv_mask);
2009         ir_node   *load_res_masked = new_d_And(dbgi, load_res, inv_mask_node, mode);
2010
2011         /* construct new value and store */
2012         ir_node *new_val   = new_d_Or(dbgi, load_res_masked, shiftr, mode);
2013         ir_node *store     = new_d_Store(dbgi, load_mem, addr, new_val,
2014                                          set_volatile ? cons_volatile : cons_none);
2015         ir_node *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
2016         set_store(store_mem);
2017
2018         if (!need_return)
2019                 return NULL;
2020
2021         ir_node *res_shr;
2022         ir_node *count_res_shr = new_Const_long(mode_uint, base_bits - bitsize);
2023         if (mode_is_signed(mode)) {
2024                 res_shr = new_d_Shrs(dbgi, shiftl, count_res_shr, mode);
2025         } else {
2026                 res_shr = new_d_Shr(dbgi, shiftl, count_res_shr, mode);
2027         }
2028         return res_shr;
2029 }
2030
2031 static ir_node *bitfield_extract_to_firm(const select_expression_t *expression,
2032                                          ir_node *addr)
2033 {
2034         dbg_info *dbgi      = get_dbg_info(&expression->base.source_position);
2035         entity_t *entity    = expression->compound_entry;
2036         type_t   *base_type = entity->declaration.type;
2037         ir_mode  *mode      = get_ir_mode_storage(base_type);
2038         ir_node  *mem       = get_store();
2039         ir_node  *load      = new_d_Load(dbgi, mem, addr, mode, cons_none);
2040         ir_node  *load_mem  = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
2041         ir_node  *load_res  = new_d_Proj(dbgi, load, mode, pn_Load_res);
2042         ir_mode  *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
2043
2044         ir_mode  *amode     = mode;
2045         /* optimisation, since shifting in modes < machine_size is usually
2046          * less efficient */
2047         if (get_mode_size_bits(amode) < get_mode_size_bits(mode_uint)) {
2048                 amode = mode_uint;
2049         }
2050         unsigned amode_size = get_mode_size_bits(amode);
2051         load_res = create_conv(dbgi, load_res, amode);
2052
2053         set_store(load_mem);
2054
2055         /* kill upper bits */
2056         assert(expression->compound_entry->kind == ENTITY_COMPOUND_MEMBER);
2057         unsigned   bitoffset   = entity->compound_member.bit_offset;
2058         unsigned   bitsize     = entity->compound_member.bit_size;
2059         unsigned   shift_bitsl = amode_size - bitoffset - bitsize;
2060         ir_tarval *tvl         = new_tarval_from_long((long)shift_bitsl, mode_uint);
2061         ir_node   *countl      = new_d_Const(dbgi, tvl);
2062         ir_node   *shiftl      = new_d_Shl(dbgi, load_res, countl, amode);
2063
2064         unsigned   shift_bitsr = bitoffset + shift_bitsl;
2065         assert(shift_bitsr <= amode_size);
2066         ir_tarval *tvr         = new_tarval_from_long((long)shift_bitsr, mode_uint);
2067         ir_node   *countr      = new_d_Const(dbgi, tvr);
2068         ir_node   *shiftr;
2069         if (mode_is_signed(mode)) {
2070                 shiftr = new_d_Shrs(dbgi, shiftl, countr, amode);
2071         } else {
2072                 shiftr = new_d_Shr(dbgi, shiftl, countr, amode);
2073         }
2074
2075         type_t  *type    = expression->base.type;
2076         ir_mode *resmode = get_ir_mode_arithmetic(type);
2077         return create_conv(dbgi, shiftr, resmode);
2078 }
2079
2080 /* make sure the selected compound type is constructed */
2081 static void construct_select_compound(const select_expression_t *expression)
2082 {
2083         type_t *type = skip_typeref(expression->compound->base.type);
2084         if (is_type_pointer(type)) {
2085                 type = type->pointer.points_to;
2086         }
2087         (void) get_ir_type(type);
2088 }
2089
2090 static ir_node *set_value_for_expression_addr(const expression_t *expression,
2091                                               ir_node *value, ir_node *addr)
2092 {
2093         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2094         type_t   *type = skip_typeref(expression->base.type);
2095
2096         if (!is_type_compound(type)) {
2097                 ir_mode  *mode = get_ir_mode_storage(type);
2098                 value          = create_conv(dbgi, value, mode);
2099                 value          = do_strict_conv(dbgi, value);
2100         }
2101
2102         if (expression->kind == EXPR_REFERENCE) {
2103                 const reference_expression_t *ref = &expression->reference;
2104
2105                 entity_t *entity = ref->entity;
2106                 assert(is_declaration(entity));
2107                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2108                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE) {
2109                         set_value(entity->variable.v.value_number, value);
2110                         return value;
2111                 } else if (entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
2112                         set_value(entity->parameter.v.value_number, value);
2113                         return value;
2114                 }
2115         }
2116
2117         if (addr == NULL)
2118                 addr = expression_to_addr(expression);
2119         assert(addr != NULL);
2120
2121         if (expression->kind == EXPR_SELECT) {
2122                 const select_expression_t *select = &expression->select;
2123
2124                 construct_select_compound(select);
2125
2126                 entity_t *entity = select->compound_entry;
2127                 assert(entity->kind == ENTITY_COMPOUND_MEMBER);
2128                 if (entity->compound_member.bitfield) {
2129                         ir_entity *irentity = entity->compound_member.entity;
2130                         bool       set_volatile
2131                                 = select->base.type->base.qualifiers & TYPE_QUALIFIER_VOLATILE;
2132                         value = bitfield_store_to_firm(dbgi, irentity, addr, value,
2133                                                        set_volatile, true);
2134                         return value;
2135                 }
2136         }
2137
2138         assign_value(dbgi, addr, type, value);
2139         return value;
2140 }
2141
2142 static void set_value_for_expression(const expression_t *expression,
2143                                      ir_node *value)
2144 {
2145         set_value_for_expression_addr(expression, value, NULL);
2146 }
2147
2148 static ir_node *get_value_from_lvalue(const expression_t *expression,
2149                                       ir_node *addr)
2150 {
2151         if (expression->kind == EXPR_REFERENCE) {
2152                 const reference_expression_t *ref = &expression->reference;
2153
2154                 entity_t *entity = ref->entity;
2155                 assert(entity->kind == ENTITY_VARIABLE
2156                                 || entity->kind == ENTITY_PARAMETER);
2157                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2158                 int value_number;
2159                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE) {
2160                         value_number = entity->variable.v.value_number;
2161                         assert(addr == NULL);
2162                         type_t  *type = skip_typeref(expression->base.type);
2163                         ir_mode *mode = get_ir_mode_storage(type);
2164                         ir_node *res  = get_value(value_number, mode);
2165                         return create_conv(NULL, res, get_ir_mode_arithmetic(type));
2166                 } else if (entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
2167                         value_number = entity->parameter.v.value_number;
2168                         assert(addr == NULL);
2169                         type_t  *type = skip_typeref(expression->base.type);
2170                         ir_mode *mode = get_ir_mode_storage(type);
2171                         ir_node *res  = get_value(value_number, mode);
2172                         return create_conv(NULL, res, get_ir_mode_arithmetic(type));
2173                 }
2174         }
2175
2176         assert(addr != NULL);
2177         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2178
2179         ir_node *value;
2180         if (expression->kind == EXPR_SELECT &&
2181             expression->select.compound_entry->compound_member.bitfield) {
2182             construct_select_compound(&expression->select);
2183                 value = bitfield_extract_to_firm(&expression->select, addr);
2184         } else {
2185                 value = deref_address(dbgi, expression->base.type, addr);
2186         }
2187
2188         return value;
2189 }
2190
2191
2192 static ir_node *create_incdec(const unary_expression_t *expression)
2193 {
2194         dbg_info *const     dbgi = get_dbg_info(&expression->base.source_position);
2195         const expression_t *value_expr = expression->value;
2196         ir_node            *addr       = expression_to_addr(value_expr);
2197         ir_node            *value      = get_value_from_lvalue(value_expr, addr);
2198
2199         type_t  *type = skip_typeref(expression->base.type);
2200         ir_mode *mode = get_ir_mode_arithmetic(expression->base.type);
2201
2202         ir_node *offset;
2203         if (is_type_pointer(type)) {
2204                 pointer_type_t *pointer_type = &type->pointer;
2205                 offset = get_type_size_node(pointer_type->points_to);
2206         } else {
2207                 assert(is_type_arithmetic(type));
2208                 offset = new_Const(get_mode_one(mode));
2209         }
2210
2211         ir_node *result;
2212         ir_node *store_value;
2213         switch(expression->base.kind) {
2214         case EXPR_UNARY_POSTFIX_INCREMENT:
2215                 result      = value;
2216                 store_value = new_d_Add(dbgi, value, offset, mode);
2217                 break;
2218         case EXPR_UNARY_POSTFIX_DECREMENT:
2219                 result      = value;
2220                 store_value = new_d_Sub(dbgi, value, offset, mode);
2221                 break;
2222         case EXPR_UNARY_PREFIX_INCREMENT:
2223                 result      = new_d_Add(dbgi, value, offset, mode);
2224                 store_value = result;
2225                 break;
2226         case EXPR_UNARY_PREFIX_DECREMENT:
2227                 result      = new_d_Sub(dbgi, value, offset, mode);
2228                 store_value = result;
2229                 break;
2230         default:
2231                 panic("no incdec expr in create_incdec");
2232         }
2233
2234         set_value_for_expression_addr(value_expr, store_value, addr);
2235
2236         return result;
2237 }
2238
2239 static bool is_local_variable(expression_t *expression)
2240 {
2241         if (expression->kind != EXPR_REFERENCE)
2242                 return false;
2243         reference_expression_t *ref_expr = &expression->reference;
2244         entity_t               *entity   = ref_expr->entity;
2245         if (entity->kind != ENTITY_VARIABLE)
2246                 return false;
2247         assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2248         return entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE;
2249 }
2250
2251 static ir_relation get_relation(const expression_kind_t kind)
2252 {
2253         switch(kind) {
2254         case EXPR_BINARY_EQUAL:         return ir_relation_equal;
2255         case EXPR_BINARY_ISLESSGREATER: return ir_relation_less_greater;
2256         case EXPR_BINARY_NOTEQUAL:      return ir_relation_unordered_less_greater;
2257         case EXPR_BINARY_ISLESS:
2258         case EXPR_BINARY_LESS:          return ir_relation_less;
2259         case EXPR_BINARY_ISLESSEQUAL:
2260         case EXPR_BINARY_LESSEQUAL:     return ir_relation_less_equal;
2261         case EXPR_BINARY_ISGREATER:
2262         case EXPR_BINARY_GREATER:       return ir_relation_greater;
2263         case EXPR_BINARY_ISGREATEREQUAL:
2264         case EXPR_BINARY_GREATEREQUAL:  return ir_relation_greater_equal;
2265         case EXPR_BINARY_ISUNORDERED:   return ir_relation_unordered;
2266
2267         default:
2268                 break;
2269         }
2270         panic("trying to get pn_Cmp from non-comparison binexpr type");
2271 }
2272
2273 /**
2274  * Handle the assume optimizer hint: check if a Confirm
2275  * node can be created.
2276  *
2277  * @param dbi    debug info
2278  * @param expr   the IL assume expression
2279  *
2280  * we support here only some simple cases:
2281  *  - var rel const
2282  *  - const rel val
2283  *  - var rel var
2284  */
2285 static ir_node *handle_assume_compare(dbg_info *dbi,
2286                                       const binary_expression_t *expression)
2287 {
2288         expression_t *op1 = expression->left;
2289         expression_t *op2 = expression->right;
2290         entity_t     *var2, *var = NULL;
2291         ir_node      *res      = NULL;
2292         ir_relation   relation = get_relation(expression->base.kind);
2293
2294         if (is_local_variable(op1) && is_local_variable(op2)) {
2295                 var  = op1->reference.entity;
2296             var2 = op2->reference.entity;
2297
2298                 type_t  *const type = skip_typeref(var->declaration.type);
2299                 ir_mode *const mode = get_ir_mode_storage(type);
2300
2301                 ir_node *const irn1 = get_value(var->variable.v.value_number, mode);
2302                 ir_node *const irn2 = get_value(var2->variable.v.value_number, mode);
2303
2304                 res = new_d_Confirm(dbi, irn2, irn1, get_inversed_relation(relation));
2305                 set_value(var2->variable.v.value_number, res);
2306
2307                 res = new_d_Confirm(dbi, irn1, irn2, relation);
2308                 set_value(var->variable.v.value_number, res);
2309
2310                 return res;
2311         }
2312
2313         expression_t *con = NULL;
2314         if (is_local_variable(op1) && is_constant_expression(op2) == EXPR_CLASS_CONSTANT) {
2315                 var = op1->reference.entity;
2316                 con = op2;
2317         } else if (is_constant_expression(op1) == EXPR_CLASS_CONSTANT && is_local_variable(op2)) {
2318                 relation = get_inversed_relation(relation);
2319                 var = op2->reference.entity;
2320                 con = op1;
2321         }
2322
2323         if (var != NULL) {
2324                 type_t  *const type = skip_typeref(var->declaration.type);
2325                 ir_mode *const mode = get_ir_mode_storage(type);
2326
2327                 res = get_value(var->variable.v.value_number, mode);
2328                 res = new_d_Confirm(dbi, res, expression_to_firm(con), relation);
2329                 set_value(var->variable.v.value_number, res);
2330         }
2331         return res;
2332 }
2333
2334 /**
2335  * Handle the assume optimizer hint.
2336  *
2337  * @param dbi    debug info
2338  * @param expr   the IL assume expression
2339  */
2340 static ir_node *handle_assume(dbg_info *dbi, const expression_t *expression)
2341 {
2342         switch(expression->kind) {
2343         case EXPR_BINARY_EQUAL:
2344         case EXPR_BINARY_NOTEQUAL:
2345         case EXPR_BINARY_LESS:
2346         case EXPR_BINARY_LESSEQUAL:
2347         case EXPR_BINARY_GREATER:
2348         case EXPR_BINARY_GREATEREQUAL:
2349                 return handle_assume_compare(dbi, &expression->binary);
2350         default:
2351                 return NULL;
2352         }
2353 }
2354
2355 static ir_node *create_cast(dbg_info *dbgi, ir_node *value_node,
2356                             type_t *from_type, type_t *type)
2357 {
2358         type = skip_typeref(type);
2359         if (type == type_void) {
2360                 /* make sure firm type is constructed */
2361                 (void) get_ir_type(type);
2362                 return NULL;
2363         }
2364         if (!is_type_scalar(type)) {
2365                 /* make sure firm type is constructed */
2366                 (void) get_ir_type(type);
2367                 return value_node;
2368         }
2369
2370         from_type     = skip_typeref(from_type);
2371         ir_mode *mode = get_ir_mode_storage(type);
2372         /* check for conversion from / to __based types */
2373         if (is_type_pointer(type) && is_type_pointer(from_type)) {
2374                 const variable_t *from_var = from_type->pointer.base_variable;
2375                 const variable_t *to_var   = type->pointer.base_variable;
2376                 if (from_var != to_var) {
2377                         if (from_var != NULL) {
2378                                 ir_node *const addr = create_symconst(dbgi, from_var->v.entity);
2379                                 ir_node *const base = deref_address(dbgi, from_var->base.type, addr);
2380                                 value_node = new_d_Add(dbgi, value_node, base, get_ir_mode_storage(from_type));
2381                         }
2382                         if (to_var != NULL) {
2383                                 ir_node *const addr = create_symconst(dbgi, to_var->v.entity);
2384                                 ir_node *const base = deref_address(dbgi, to_var->base.type, addr);
2385                                 value_node = new_d_Sub(dbgi, value_node, base, mode);
2386                         }
2387                 }
2388         }
2389
2390         if (is_type_atomic(type, ATOMIC_TYPE_BOOL)) {
2391                 /* bool adjustments (we save a mode_Bu, but have to temporarily
2392                  * convert to mode_b so we only get a 0/1 value */
2393                 value_node = create_conv(dbgi, value_node, mode_b);
2394         }
2395
2396         ir_mode *mode_arith = get_ir_mode_arithmetic(type);
2397         ir_node *node       = create_conv(dbgi, value_node, mode);
2398         node                = do_strict_conv(dbgi, node);
2399         node                = create_conv(dbgi, node, mode_arith);
2400
2401         return node;
2402 }
2403
2404 static ir_node *unary_expression_to_firm(const unary_expression_t *expression)
2405 {
2406         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2407         type_t   *type = skip_typeref(expression->base.type);
2408
2409         if (expression->base.kind == EXPR_UNARY_TAKE_ADDRESS)
2410                 return expression_to_addr(expression->value);
2411
2412         const expression_t *value = expression->value;
2413
2414         switch(expression->base.kind) {
2415         case EXPR_UNARY_NEGATE: {
2416                 ir_node *value_node = expression_to_firm(value);
2417                 ir_mode *mode       = get_ir_mode_arithmetic(type);
2418                 return new_d_Minus(dbgi, value_node, mode);
2419         }
2420         case EXPR_UNARY_PLUS:
2421                 return expression_to_firm(value);
2422         case EXPR_UNARY_BITWISE_NEGATE: {
2423                 ir_node *value_node = expression_to_firm(value);
2424                 ir_mode *mode       = get_ir_mode_arithmetic(type);
2425                 return new_d_Not(dbgi, value_node, mode);
2426         }
2427         case EXPR_UNARY_NOT: {
2428                 ir_node *value_node = _expression_to_firm(value);
2429                 value_node          = create_conv(dbgi, value_node, mode_b);
2430                 ir_node *res        = new_d_Not(dbgi, value_node, mode_b);
2431                 return res;
2432         }
2433         case EXPR_UNARY_DEREFERENCE: {
2434                 ir_node *value_node = expression_to_firm(value);
2435                 type_t  *value_type = skip_typeref(value->base.type);
2436                 assert(is_type_pointer(value_type));
2437
2438                 /* check for __based */
2439                 const variable_t *const base_var = value_type->pointer.base_variable;
2440                 if (base_var != NULL) {
2441                         ir_node *const addr = create_symconst(dbgi, base_var->v.entity);
2442                         ir_node *const base = deref_address(dbgi, base_var->base.type, addr);
2443                         value_node = new_d_Add(dbgi, value_node, base, get_ir_mode_storage(value_type));
2444                 }
2445                 type_t  *points_to  = value_type->pointer.points_to;
2446                 return deref_address(dbgi, points_to, value_node);
2447         }
2448         case EXPR_UNARY_POSTFIX_INCREMENT:
2449         case EXPR_UNARY_POSTFIX_DECREMENT:
2450         case EXPR_UNARY_PREFIX_INCREMENT:
2451         case EXPR_UNARY_PREFIX_DECREMENT:
2452                 return create_incdec(expression);
2453         case EXPR_UNARY_CAST: {
2454                 ir_node *value_node = expression_to_firm(value);
2455                 type_t  *from_type  = value->base.type;
2456                 return create_cast(dbgi, value_node, from_type, type);
2457         }
2458         case EXPR_UNARY_ASSUME:
2459                 return handle_assume(dbgi, value);
2460
2461         default:
2462                 break;
2463         }
2464         panic("invalid UNEXPR type found");
2465 }
2466
2467 /**
2468  * produces a 0/1 depending of the value of a mode_b node
2469  */
2470 static ir_node *produce_condition_result(const expression_t *expression,
2471                                          ir_mode *mode, dbg_info *dbgi)
2472 {
2473         ir_node *const one_block  = new_immBlock();
2474         ir_node *const zero_block = new_immBlock();
2475         create_condition_evaluation(expression, one_block, zero_block);
2476         mature_immBlock(one_block);
2477         mature_immBlock(zero_block);
2478
2479         ir_node *const jmp_one  = new_rd_Jmp(dbgi, one_block);
2480         ir_node *const jmp_zero = new_rd_Jmp(dbgi, zero_block);
2481         ir_node *const in_cf[2] = { jmp_one, jmp_zero };
2482         ir_node *const block    = new_Block(lengthof(in_cf), in_cf);
2483         set_cur_block(block);
2484
2485         ir_node *const one   = new_Const(get_mode_one(mode));
2486         ir_node *const zero  = new_Const(get_mode_null(mode));
2487         ir_node *const in[2] = { one, zero };
2488         ir_node *const val   = new_d_Phi(dbgi, lengthof(in), in, mode);
2489
2490         return val;
2491 }
2492
2493 static ir_node *adjust_for_pointer_arithmetic(dbg_info *dbgi,
2494                 ir_node *value, type_t *type)
2495 {
2496         ir_mode        *const mode         = get_ir_mode_arithmetic(type_ptrdiff_t);
2497         assert(is_type_pointer(type));
2498         pointer_type_t *const pointer_type = &type->pointer;
2499         type_t         *const points_to    = skip_typeref(pointer_type->points_to);
2500         ir_node        *      elem_size    = get_type_size_node(points_to);
2501         elem_size                          = create_conv(dbgi, elem_size, mode);
2502         value                              = create_conv(dbgi, value,     mode);
2503         ir_node        *const mul          = new_d_Mul(dbgi, value, elem_size, mode);
2504         return mul;
2505 }
2506
2507 static ir_node *create_op(dbg_info *dbgi, const binary_expression_t *expression,
2508                           ir_node *left, ir_node *right)
2509 {
2510         ir_mode  *mode;
2511         type_t   *type_left  = skip_typeref(expression->left->base.type);
2512         type_t   *type_right = skip_typeref(expression->right->base.type);
2513
2514         expression_kind_t kind = expression->base.kind;
2515
2516         switch (kind) {
2517         case EXPR_BINARY_SHIFTLEFT:
2518         case EXPR_BINARY_SHIFTRIGHT:
2519         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2520         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2521                 mode  = get_ir_mode_arithmetic(expression->base.type);
2522                 right = create_conv(dbgi, right, atomic_modes[ATOMIC_TYPE_UINT]);
2523                 break;
2524
2525         case EXPR_BINARY_SUB:
2526                 if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
2527                         const pointer_type_t *const ptr_type = &type_left->pointer;
2528
2529                         mode = get_ir_mode_arithmetic(expression->base.type);
2530                         ir_node *const elem_size = get_type_size_node(ptr_type->points_to);
2531                         ir_node *const conv_size = new_d_Conv(dbgi, elem_size, mode);
2532                         ir_node *const sub       = new_d_Sub(dbgi, left, right, mode);
2533                         ir_node *const no_mem    = new_NoMem();
2534                         ir_node *const div       = new_d_DivRL(dbgi, no_mem, sub, conv_size,
2535                                                                                                    mode, op_pin_state_floats);
2536                         return new_d_Proj(dbgi, div, mode, pn_Div_res);
2537                 }
2538                 /* fallthrough */
2539         case EXPR_BINARY_SUB_ASSIGN:
2540                 if (is_type_pointer(type_left)) {
2541                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2542                         mode  = get_ir_mode_arithmetic(type_left);
2543                         break;
2544                 }
2545                 goto normal_node;
2546
2547         case EXPR_BINARY_ADD:
2548         case EXPR_BINARY_ADD_ASSIGN:
2549                 if (is_type_pointer(type_left)) {
2550                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2551                         mode  = get_ir_mode_arithmetic(type_left);
2552                         break;
2553                 } else if (is_type_pointer(type_right)) {
2554                         left  = adjust_for_pointer_arithmetic(dbgi, left, type_right);
2555                         mode  = get_ir_mode_arithmetic(type_right);
2556                         break;
2557                 }
2558                 goto normal_node;
2559
2560         default:
2561 normal_node:
2562                 mode = get_ir_mode_arithmetic(type_right);
2563                 left = create_conv(dbgi, left, mode);
2564                 break;
2565         }
2566
2567         switch (kind) {
2568         case EXPR_BINARY_ADD_ASSIGN:
2569         case EXPR_BINARY_ADD:
2570                 return new_d_Add(dbgi, left, right, mode);
2571         case EXPR_BINARY_SUB_ASSIGN:
2572         case EXPR_BINARY_SUB:
2573                 return new_d_Sub(dbgi, left, right, mode);
2574         case EXPR_BINARY_MUL_ASSIGN:
2575         case EXPR_BINARY_MUL:
2576                 return new_d_Mul(dbgi, left, right, mode);
2577         case EXPR_BINARY_BITWISE_AND:
2578         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2579                 return new_d_And(dbgi, left, right, mode);
2580         case EXPR_BINARY_BITWISE_OR:
2581         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2582                 return new_d_Or(dbgi, left, right, mode);
2583         case EXPR_BINARY_BITWISE_XOR:
2584         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2585                 return new_d_Eor(dbgi, left, right, mode);
2586         case EXPR_BINARY_SHIFTLEFT:
2587         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2588                 return new_d_Shl(dbgi, left, right, mode);
2589         case EXPR_BINARY_SHIFTRIGHT:
2590         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2591                 if (mode_is_signed(mode)) {
2592                         return new_d_Shrs(dbgi, left, right, mode);
2593                 } else {
2594                         return new_d_Shr(dbgi, left, right, mode);
2595                 }
2596         case EXPR_BINARY_DIV:
2597         case EXPR_BINARY_DIV_ASSIGN: {
2598                 ir_node *pin = new_Pin(new_NoMem());
2599                 ir_node *op  = new_d_Div(dbgi, pin, left, right, mode,
2600                                          op_pin_state_floats);
2601                 ir_node *res = new_d_Proj(dbgi, op, mode, pn_Div_res);
2602                 return res;
2603         }
2604         case EXPR_BINARY_MOD:
2605         case EXPR_BINARY_MOD_ASSIGN: {
2606                 ir_node *pin = new_Pin(new_NoMem());
2607                 assert(!mode_is_float(mode));
2608                 ir_node *op  = new_d_Mod(dbgi, pin, left, right, mode,
2609                                          op_pin_state_floats);
2610                 ir_node *res = new_d_Proj(dbgi, op, mode, pn_Mod_res);
2611                 return res;
2612         }
2613         default:
2614                 panic("unexpected expression kind");
2615         }
2616 }
2617
2618 static ir_node *create_lazy_op(const binary_expression_t *expression)
2619 {
2620         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2621         type_t   *type = skip_typeref(expression->base.type);
2622         ir_mode  *mode = get_ir_mode_arithmetic(type);
2623
2624         if (is_constant_expression(expression->left) == EXPR_CLASS_CONSTANT) {
2625                 bool val = fold_constant_to_bool(expression->left);
2626                 expression_kind_t ekind = expression->base.kind;
2627                 assert(ekind == EXPR_BINARY_LOGICAL_AND || ekind == EXPR_BINARY_LOGICAL_OR);
2628                 if (ekind == EXPR_BINARY_LOGICAL_AND) {
2629                         if (!val) {
2630                                 return new_Const(get_mode_null(mode));
2631                         }
2632                 } else {
2633                         if (val) {
2634                                 return new_Const(get_mode_one(mode));
2635                         }
2636                 }
2637
2638                 if (is_constant_expression(expression->right) == EXPR_CLASS_CONSTANT) {
2639                         bool valr = fold_constant_to_bool(expression->right);
2640                         return create_Const_from_bool(mode, valr);
2641                 }
2642
2643                 return produce_condition_result(expression->right, mode, dbgi);
2644         }
2645
2646         return produce_condition_result((const expression_t*) expression, mode,
2647                                         dbgi);
2648 }
2649
2650 typedef ir_node * (*create_arithmetic_func)(dbg_info *dbgi, ir_node *left,
2651                                             ir_node *right, ir_mode *mode);
2652
2653 static ir_node *create_assign_binop(const binary_expression_t *expression)
2654 {
2655         dbg_info *const     dbgi = get_dbg_info(&expression->base.source_position);
2656         const expression_t *left_expr = expression->left;
2657         type_t             *type      = skip_typeref(left_expr->base.type);
2658         ir_node            *right     = expression_to_firm(expression->right);
2659         ir_node            *left_addr = expression_to_addr(left_expr);
2660         ir_node            *left      = get_value_from_lvalue(left_expr, left_addr);
2661         ir_node            *result    = create_op(dbgi, expression, left, right);
2662
2663         result = create_cast(dbgi, result, expression->right->base.type, type);
2664         result = do_strict_conv(dbgi, result);
2665
2666         result = set_value_for_expression_addr(left_expr, result, left_addr);
2667
2668         if (!is_type_compound(type)) {
2669                 ir_mode *mode_arithmetic = get_ir_mode_arithmetic(type);
2670                 result = create_conv(dbgi, result, mode_arithmetic);
2671         }
2672         return result;
2673 }
2674
2675 static ir_node *binary_expression_to_firm(const binary_expression_t *expression)
2676 {
2677         expression_kind_t kind = expression->base.kind;
2678
2679         switch(kind) {
2680         case EXPR_BINARY_EQUAL:
2681         case EXPR_BINARY_NOTEQUAL:
2682         case EXPR_BINARY_LESS:
2683         case EXPR_BINARY_LESSEQUAL:
2684         case EXPR_BINARY_GREATER:
2685         case EXPR_BINARY_GREATEREQUAL:
2686         case EXPR_BINARY_ISGREATER:
2687         case EXPR_BINARY_ISGREATEREQUAL:
2688         case EXPR_BINARY_ISLESS:
2689         case EXPR_BINARY_ISLESSEQUAL:
2690         case EXPR_BINARY_ISLESSGREATER:
2691         case EXPR_BINARY_ISUNORDERED: {
2692                 dbg_info   *dbgi     = get_dbg_info(&expression->base.source_position);
2693                 ir_node    *left     = expression_to_firm(expression->left);
2694                 ir_node    *right    = expression_to_firm(expression->right);
2695                 ir_relation relation = get_relation(kind);
2696                 ir_node    *cmp      = new_d_Cmp(dbgi, left, right, relation);
2697                 return cmp;
2698         }
2699         case EXPR_BINARY_ASSIGN: {
2700                 ir_node *addr  = expression_to_addr(expression->left);
2701                 ir_node *right = expression_to_firm(expression->right);
2702                 ir_node *res
2703                         = set_value_for_expression_addr(expression->left, right, addr);
2704
2705                 type_t  *type            = skip_typeref(expression->base.type);
2706                 if (!is_type_compound(type)) {
2707                         ir_mode *mode_arithmetic = get_ir_mode_arithmetic(type);
2708                         res                      = create_conv(NULL, res, mode_arithmetic);
2709                 }
2710                 return res;
2711         }
2712         case EXPR_BINARY_ADD:
2713         case EXPR_BINARY_SUB:
2714         case EXPR_BINARY_MUL:
2715         case EXPR_BINARY_DIV:
2716         case EXPR_BINARY_MOD:
2717         case EXPR_BINARY_BITWISE_AND:
2718         case EXPR_BINARY_BITWISE_OR:
2719         case EXPR_BINARY_BITWISE_XOR:
2720         case EXPR_BINARY_SHIFTLEFT:
2721         case EXPR_BINARY_SHIFTRIGHT:
2722         {
2723                 dbg_info *dbgi  = get_dbg_info(&expression->base.source_position);
2724                 ir_node  *left  = expression_to_firm(expression->left);
2725                 ir_node  *right = expression_to_firm(expression->right);
2726                 return create_op(dbgi, expression, left, right);
2727         }
2728         case EXPR_BINARY_LOGICAL_AND:
2729         case EXPR_BINARY_LOGICAL_OR:
2730                 return create_lazy_op(expression);
2731         case EXPR_BINARY_COMMA:
2732                 /* create side effects of left side */
2733                 (void) expression_to_firm(expression->left);
2734                 return _expression_to_firm(expression->right);
2735
2736         case EXPR_BINARY_ADD_ASSIGN:
2737         case EXPR_BINARY_SUB_ASSIGN:
2738         case EXPR_BINARY_MUL_ASSIGN:
2739         case EXPR_BINARY_MOD_ASSIGN:
2740         case EXPR_BINARY_DIV_ASSIGN:
2741         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2742         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2743         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2744         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2745         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2746                 return create_assign_binop(expression);
2747         default:
2748                 panic("TODO binexpr type");
2749         }
2750 }
2751
2752 static ir_node *array_access_addr(const array_access_expression_t *expression)
2753 {
2754         dbg_info *dbgi        = get_dbg_info(&expression->base.source_position);
2755         ir_node  *base_addr   = expression_to_firm(expression->array_ref);
2756         ir_node  *offset      = expression_to_firm(expression->index);
2757         type_t   *ref_type    = skip_typeref(expression->array_ref->base.type);
2758         ir_node  *real_offset = adjust_for_pointer_arithmetic(dbgi, offset, ref_type);
2759         ir_node  *result      = new_d_Add(dbgi, base_addr, real_offset, mode_P_data);
2760
2761         return result;
2762 }
2763
2764 static ir_node *array_access_to_firm(
2765                 const array_access_expression_t *expression)
2766 {
2767         dbg_info *dbgi   = get_dbg_info(&expression->base.source_position);
2768         ir_node  *addr   = array_access_addr(expression);
2769         type_t   *type   = revert_automatic_type_conversion(
2770                         (const expression_t*) expression);
2771         type             = skip_typeref(type);
2772
2773         return deref_address(dbgi, type, addr);
2774 }
2775
2776 static long get_offsetof_offset(const offsetof_expression_t *expression)
2777 {
2778         type_t *orig_type = expression->type;
2779         long    offset    = 0;
2780
2781         designator_t *designator = expression->designator;
2782         for ( ; designator != NULL; designator = designator->next) {
2783                 type_t *type = skip_typeref(orig_type);
2784                 /* be sure the type is constructed */
2785                 (void) get_ir_type(type);
2786
2787                 if (designator->symbol != NULL) {
2788                         assert(is_type_compound(type));
2789                         symbol_t *symbol = designator->symbol;
2790
2791                         compound_t *compound = type->compound.compound;
2792                         entity_t   *iter     = compound->members.entities;
2793                         for ( ; iter != NULL; iter = iter->base.next) {
2794                                 if (iter->base.symbol == symbol) {
2795                                         break;
2796                                 }
2797                         }
2798                         assert(iter != NULL);
2799
2800                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
2801                         assert(iter->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
2802                         offset += get_entity_offset(iter->compound_member.entity);
2803
2804                         orig_type = iter->declaration.type;
2805                 } else {
2806                         expression_t *array_index = designator->array_index;
2807                         assert(designator->array_index != NULL);
2808                         assert(is_type_array(type));
2809
2810                         long index         = fold_constant_to_int(array_index);
2811                         ir_type *arr_type  = get_ir_type(type);
2812                         ir_type *elem_type = get_array_element_type(arr_type);
2813                         long     elem_size = get_type_size_bytes(elem_type);
2814
2815                         offset += index * elem_size;
2816
2817                         orig_type = type->array.element_type;
2818                 }
2819         }
2820
2821         return offset;
2822 }
2823
2824 static ir_node *offsetof_to_firm(const offsetof_expression_t *expression)
2825 {
2826         ir_mode   *mode   = get_ir_mode_arithmetic(expression->base.type);
2827         long       offset = get_offsetof_offset(expression);
2828         ir_tarval *tv     = new_tarval_from_long(offset, mode);
2829         dbg_info  *dbgi   = get_dbg_info(&expression->base.source_position);
2830
2831         return new_d_Const(dbgi, tv);
2832 }
2833
2834 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
2835                                      ir_entity *entity, type_t *type);
2836
2837 static ir_node *compound_literal_to_firm(
2838                 const compound_literal_expression_t *expression)
2839 {
2840         type_t *type = expression->type;
2841
2842         /* create an entity on the stack */
2843         ir_type *frame_type = get_irg_frame_type(current_ir_graph);
2844
2845         ident     *const id     = id_unique("CompLit.%u");
2846         ir_type   *const irtype = get_ir_type(type);
2847         dbg_info  *const dbgi   = get_dbg_info(&expression->base.source_position);
2848         ir_entity *const entity = new_d_entity(frame_type, id, irtype, dbgi);
2849         set_entity_ld_ident(entity, id);
2850
2851         /* create initialisation code */
2852         initializer_t *initializer = expression->initializer;
2853         create_local_initializer(initializer, dbgi, entity, type);
2854
2855         /* create a sel for the compound literal address */
2856         ir_node *frame = get_irg_frame(current_ir_graph);
2857         ir_node *sel   = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
2858         return sel;
2859 }
2860
2861 /**
2862  * Transform a sizeof expression into Firm code.
2863  */
2864 static ir_node *sizeof_to_firm(const typeprop_expression_t *expression)
2865 {
2866         type_t *const type = skip_typeref(expression->type);
2867         /* §6.5.3.4:2 if the type is a VLA, evaluate the expression. */
2868         if (is_type_array(type) && type->array.is_vla
2869                         && expression->tp_expression != NULL) {
2870                 expression_to_firm(expression->tp_expression);
2871         }
2872         /* strange gnu extensions: sizeof(function) == 1 */
2873         if (is_type_function(type)) {
2874                 ir_mode *mode = get_ir_mode_storage(type_size_t);
2875                 return new_Const(get_mode_one(mode));
2876         }
2877
2878         return get_type_size_node(type);
2879 }
2880
2881 static entity_t *get_expression_entity(const expression_t *expression)
2882 {
2883         if (expression->kind != EXPR_REFERENCE)
2884                 return NULL;
2885
2886         return expression->reference.entity;
2887 }
2888
2889 static unsigned get_cparser_entity_alignment(const entity_t *entity)
2890 {
2891         switch(entity->kind) {
2892         DECLARATION_KIND_CASES
2893                 return entity->declaration.alignment;
2894         case ENTITY_STRUCT:
2895         case ENTITY_UNION:
2896                 return entity->compound.alignment;
2897         case ENTITY_TYPEDEF:
2898                 return entity->typedefe.alignment;
2899         default:
2900                 break;
2901         }
2902         return 0;
2903 }
2904
2905 /**
2906  * Transform an alignof expression into Firm code.
2907  */
2908 static ir_node *alignof_to_firm(const typeprop_expression_t *expression)
2909 {
2910         unsigned alignment = 0;
2911
2912         const expression_t *tp_expression = expression->tp_expression;
2913         if (tp_expression != NULL) {
2914                 entity_t *entity = get_expression_entity(tp_expression);
2915                 if (entity != NULL) {
2916                         if (entity->kind == ENTITY_FUNCTION) {
2917                                 /* a gnu-extension */
2918                                 alignment = 1;
2919                         } else {
2920                                 alignment = get_cparser_entity_alignment(entity);
2921                         }
2922                 }
2923         }
2924
2925         if (alignment == 0) {
2926                 type_t *type = expression->type;
2927                 alignment = get_type_alignment(type);
2928         }
2929
2930         dbg_info  *dbgi = get_dbg_info(&expression->base.source_position);
2931         ir_mode   *mode = get_ir_mode_arithmetic(expression->base.type);
2932         ir_tarval *tv   = new_tarval_from_long(alignment, mode);
2933         return new_d_Const(dbgi, tv);
2934 }
2935
2936 static void init_ir_types(void);
2937
2938 static ir_tarval *fold_constant_to_tarval(const expression_t *expression)
2939 {
2940         assert(is_type_valid(skip_typeref(expression->base.type)));
2941
2942         bool constant_folding_old = constant_folding;
2943         constant_folding = true;
2944
2945         init_ir_types();
2946
2947         assert(is_constant_expression(expression) == EXPR_CLASS_CONSTANT);
2948
2949         ir_graph *old_current_ir_graph = current_ir_graph;
2950         current_ir_graph = get_const_code_irg();
2951
2952         ir_node *cnst = expression_to_firm(expression);
2953         current_ir_graph = old_current_ir_graph;
2954
2955         if (!is_Const(cnst)) {
2956                 panic("couldn't fold constant");
2957         }
2958
2959         constant_folding = constant_folding_old;
2960
2961         return get_Const_tarval(cnst);
2962 }
2963
2964 /* this function is only used in parser.c, but it relies on libfirm functionality */
2965 bool constant_is_negative(const expression_t *expression)
2966 {
2967         assert(is_constant_expression(expression) == EXPR_CLASS_CONSTANT);
2968         ir_tarval *tv = fold_constant_to_tarval(expression);
2969         return tarval_is_negative(tv);
2970 }
2971
2972 long fold_constant_to_int(const expression_t *expression)
2973 {
2974         if (expression->kind == EXPR_ERROR)
2975                 return 0;
2976
2977         ir_tarval *tv = fold_constant_to_tarval(expression);
2978         if (!tarval_is_long(tv)) {
2979                 panic("result of constant folding is not integer");
2980         }
2981
2982         return get_tarval_long(tv);
2983 }
2984
2985 bool fold_constant_to_bool(const expression_t *expression)
2986 {
2987         if (expression->kind == EXPR_ERROR)
2988                 return false;
2989         ir_tarval *tv = fold_constant_to_tarval(expression);
2990         return !tarval_is_null(tv);
2991 }
2992
2993 static ir_node *conditional_to_firm(const conditional_expression_t *expression)
2994 {
2995         dbg_info *const dbgi = get_dbg_info(&expression->base.source_position);
2996
2997         /* first try to fold a constant condition */
2998         if (is_constant_expression(expression->condition) == EXPR_CLASS_CONSTANT) {
2999                 bool val = fold_constant_to_bool(expression->condition);
3000                 if (val) {
3001                         expression_t *true_expression = expression->true_expression;
3002                         if (true_expression == NULL)
3003                                 true_expression = expression->condition;
3004                         return expression_to_firm(true_expression);
3005                 } else {
3006                         return expression_to_firm(expression->false_expression);
3007                 }
3008         }
3009
3010         ir_node *const true_block  = new_immBlock();
3011         ir_node *const false_block = new_immBlock();
3012         ir_node *const cond_expr   = create_condition_evaluation(expression->condition, true_block, false_block);
3013         mature_immBlock(true_block);
3014         mature_immBlock(false_block);
3015
3016         set_cur_block(true_block);
3017         ir_node *true_val;
3018         if (expression->true_expression != NULL) {
3019                 true_val = expression_to_firm(expression->true_expression);
3020         } else if (cond_expr != NULL && get_irn_mode(cond_expr) != mode_b) {
3021                 true_val = cond_expr;
3022         } else {
3023                 /* Condition ended with a short circuit (&&, ||, !) operation or a
3024                  * comparison.  Generate a "1" as value for the true branch. */
3025                 true_val = new_Const(get_mode_one(mode_Is));
3026         }
3027         ir_node *const true_jmp = new_d_Jmp(dbgi);
3028
3029         set_cur_block(false_block);
3030         ir_node *const false_val = expression_to_firm(expression->false_expression);
3031         ir_node *const false_jmp = new_d_Jmp(dbgi);
3032
3033         /* create the common block */
3034         ir_node *const in_cf[2] = { true_jmp, false_jmp };
3035         ir_node *const block    = new_Block(lengthof(in_cf), in_cf);
3036         set_cur_block(block);
3037
3038         /* TODO improve static semantics, so either both or no values are NULL */
3039         if (true_val == NULL || false_val == NULL)
3040                 return NULL;
3041
3042         ir_node *const in[2] = { true_val, false_val };
3043         type_t  *const type  = skip_typeref(expression->base.type);
3044         ir_mode *mode;
3045         if (is_type_compound(type)) {
3046                 mode = mode_P;
3047         } else {
3048                 mode = get_ir_mode_arithmetic(type);
3049         }
3050         ir_node *const val   = new_d_Phi(dbgi, lengthof(in), in, mode);
3051
3052         return val;
3053 }
3054
3055 /**
3056  * Returns an IR-node representing the address of a field.
3057  */
3058 static ir_node *select_addr(const select_expression_t *expression)
3059 {
3060         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3061
3062         construct_select_compound(expression);
3063
3064         ir_node *compound_addr = expression_to_firm(expression->compound);
3065
3066         entity_t *entry = expression->compound_entry;
3067         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3068         assert(entry->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
3069
3070         if (constant_folding) {
3071                 ir_mode *mode      = get_irn_mode(compound_addr);
3072                 ir_mode *mode_uint = get_reference_mode_unsigned_eq(mode);
3073                 ir_node *ofs       = new_Const_long(mode_uint, entry->compound_member.offset);
3074                 return new_d_Add(dbgi, compound_addr, ofs, mode);
3075         } else {
3076                 ir_entity *irentity = entry->compound_member.entity;
3077                 assert(irentity != NULL);
3078                 return new_d_simpleSel(dbgi, new_NoMem(), compound_addr, irentity);
3079         }
3080 }
3081
3082 static ir_node *select_to_firm(const select_expression_t *expression)
3083 {
3084         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3085         ir_node  *addr = select_addr(expression);
3086         type_t   *type = revert_automatic_type_conversion(
3087                         (const expression_t*) expression);
3088         type           = skip_typeref(type);
3089
3090         entity_t *entry = expression->compound_entry;
3091         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3092
3093         if (entry->compound_member.bitfield) {
3094                 return bitfield_extract_to_firm(expression, addr);
3095         }
3096
3097         return deref_address(dbgi, type, addr);
3098 }
3099
3100 /* Values returned by __builtin_classify_type. */
3101 typedef enum gcc_type_class
3102 {
3103         no_type_class = -1,
3104         void_type_class,
3105         integer_type_class,
3106         char_type_class,
3107         enumeral_type_class,
3108         boolean_type_class,
3109         pointer_type_class,
3110         reference_type_class,
3111         offset_type_class,
3112         real_type_class,
3113         complex_type_class,
3114         function_type_class,
3115         method_type_class,
3116         record_type_class,
3117         union_type_class,
3118         array_type_class,
3119         string_type_class,
3120         set_type_class,
3121         file_type_class,
3122         lang_type_class
3123 } gcc_type_class;
3124
3125 static ir_node *classify_type_to_firm(const classify_type_expression_t *const expr)
3126 {
3127         type_t *type = expr->type_expression->base.type;
3128
3129         /* FIXME gcc returns different values depending on whether compiling C or C++
3130          * e.g. int x[10] is pointer_type_class in C, but array_type_class in C++ */
3131         gcc_type_class tc;
3132         for (;;) {
3133                 type = skip_typeref(type);
3134                 switch (type->kind) {
3135                         case TYPE_ATOMIC: {
3136                                 const atomic_type_t *const atomic_type = &type->atomic;
3137                                 switch (atomic_type->akind) {
3138                                         /* should not be reached */
3139                                         case ATOMIC_TYPE_INVALID:
3140                                                 tc = no_type_class;
3141                                                 goto make_const;
3142
3143                                         /* gcc cannot do that */
3144                                         case ATOMIC_TYPE_VOID:
3145                                                 tc = void_type_class;
3146                                                 goto make_const;
3147
3148                                         case ATOMIC_TYPE_WCHAR_T:   /* gcc handles this as integer */
3149                                         case ATOMIC_TYPE_CHAR:      /* gcc handles this as integer */
3150                                         case ATOMIC_TYPE_SCHAR:     /* gcc handles this as integer */
3151                                         case ATOMIC_TYPE_UCHAR:     /* gcc handles this as integer */
3152                                         case ATOMIC_TYPE_SHORT:
3153                                         case ATOMIC_TYPE_USHORT:
3154                                         case ATOMIC_TYPE_INT:
3155                                         case ATOMIC_TYPE_UINT:
3156                                         case ATOMIC_TYPE_LONG:
3157                                         case ATOMIC_TYPE_ULONG:
3158                                         case ATOMIC_TYPE_LONGLONG:
3159                                         case ATOMIC_TYPE_ULONGLONG:
3160                                         case ATOMIC_TYPE_BOOL:      /* gcc handles this as integer */
3161                                                 tc = integer_type_class;
3162                                                 goto make_const;
3163
3164                                         case ATOMIC_TYPE_FLOAT:
3165                                         case ATOMIC_TYPE_DOUBLE:
3166                                         case ATOMIC_TYPE_LONG_DOUBLE:
3167                                                 tc = real_type_class;
3168                                                 goto make_const;
3169                                 }
3170                                 panic("Unexpected atomic type in classify_type_to_firm().");
3171                         }
3172
3173                         case TYPE_COMPLEX:         tc = complex_type_class; goto make_const;
3174                         case TYPE_IMAGINARY:       tc = complex_type_class; goto make_const;
3175                         case TYPE_ARRAY:           /* gcc handles this as pointer */
3176                         case TYPE_FUNCTION:        /* gcc handles this as pointer */
3177                         case TYPE_POINTER:         tc = pointer_type_class; goto make_const;
3178                         case TYPE_COMPOUND_STRUCT: tc = record_type_class;  goto make_const;
3179                         case TYPE_COMPOUND_UNION:  tc = union_type_class;   goto make_const;
3180
3181                         /* gcc handles this as integer */
3182                         case TYPE_ENUM:            tc = integer_type_class; goto make_const;
3183
3184                         /* gcc classifies the referenced type */
3185                         case TYPE_REFERENCE: type = type->reference.refers_to; continue;
3186
3187                         /* typedef/typeof should be skipped already */
3188                         case TYPE_TYPEDEF:
3189                         case TYPE_TYPEOF:
3190                         case TYPE_ERROR:
3191                                 break;
3192                 }
3193                 panic("unexpected TYPE classify_type_to_firm().");
3194         }
3195
3196 make_const:;
3197         dbg_info  *const dbgi = get_dbg_info(&expr->base.source_position);
3198         ir_mode   *const mode = atomic_modes[ATOMIC_TYPE_INT];
3199         ir_tarval *const tv   = new_tarval_from_long(tc, mode);
3200         return new_d_Const(dbgi, tv);
3201 }
3202
3203 static ir_node *function_name_to_firm(
3204                 const funcname_expression_t *const expr)
3205 {
3206         switch(expr->kind) {
3207         case FUNCNAME_FUNCTION:
3208         case FUNCNAME_PRETTY_FUNCTION:
3209         case FUNCNAME_FUNCDNAME:
3210                 if (current_function_name == NULL) {
3211                         const source_position_t *const src_pos = &expr->base.source_position;
3212                         const char    *name  = current_function_entity->base.symbol->string;
3213                         const string_t string = { name, strlen(name) + 1 };
3214                         current_function_name = string_to_firm(src_pos, "__func__.%u", &string);
3215                 }
3216                 return current_function_name;
3217         case FUNCNAME_FUNCSIG:
3218                 if (current_funcsig == NULL) {
3219                         const source_position_t *const src_pos = &expr->base.source_position;
3220                         ir_entity *ent = get_irg_entity(current_ir_graph);
3221                         const char *const name = get_entity_ld_name(ent);
3222                         const string_t string = { name, strlen(name) + 1 };
3223                         current_funcsig = string_to_firm(src_pos, "__FUNCSIG__.%u", &string);
3224                 }
3225                 return current_funcsig;
3226         }
3227         panic("Unsupported function name");
3228 }
3229
3230 static ir_node *statement_expression_to_firm(const statement_expression_t *expr)
3231 {
3232         statement_t *statement = expr->statement;
3233
3234         assert(statement->kind == STATEMENT_COMPOUND);
3235         return compound_statement_to_firm(&statement->compound);
3236 }
3237
3238 static ir_node *va_start_expression_to_firm(
3239         const va_start_expression_t *const expr)
3240 {
3241         ir_entity *param_ent = current_vararg_entity;
3242         if (param_ent == NULL) {
3243                 size_t   const n           = IR_VA_START_PARAMETER_NUMBER;
3244                 ir_type *const frame_type  = get_irg_frame_type(current_ir_graph);
3245                 ir_type *const param_type  = get_unknown_type();
3246                 param_ent = new_parameter_entity(frame_type, n, param_type);
3247                 current_vararg_entity = param_ent;
3248         }
3249
3250         ir_node  *const frame   = get_irg_frame(current_ir_graph);
3251         dbg_info *const dbgi    = get_dbg_info(&expr->base.source_position);
3252         ir_node  *const no_mem  = new_NoMem();
3253         ir_node  *const arg_sel = new_d_simpleSel(dbgi, no_mem, frame, param_ent);
3254
3255         set_value_for_expression(expr->ap, arg_sel);
3256
3257         return NULL;
3258 }
3259
3260 static ir_node *va_arg_expression_to_firm(const va_arg_expression_t *const expr)
3261 {
3262         type_t       *const type    = expr->base.type;
3263         expression_t *const ap_expr = expr->ap;
3264         ir_node      *const ap_addr = expression_to_addr(ap_expr);
3265         ir_node      *const ap      = get_value_from_lvalue(ap_expr, ap_addr);
3266         dbg_info     *const dbgi    = get_dbg_info(&expr->base.source_position);
3267         ir_node      *const res     = deref_address(dbgi, type, ap);
3268
3269         ir_node      *const cnst    = get_type_size_node(expr->base.type);
3270         ir_mode      *const mode    = get_irn_mode(cnst);
3271         ir_node      *const c1      = new_Const_long(mode, stack_param_align - 1);
3272         ir_node      *const c2      = new_d_Add(dbgi, cnst, c1, mode);
3273         ir_node      *const c3      = new_Const_long(mode, -(long)stack_param_align);
3274         ir_node      *const c4      = new_d_And(dbgi, c2, c3, mode);
3275         ir_node      *const add     = new_d_Add(dbgi, ap, c4, mode_P_data);
3276
3277         set_value_for_expression_addr(ap_expr, add, ap_addr);
3278
3279         return res;
3280 }
3281
3282 /**
3283  * Generate Firm for a va_copy expression.
3284  */
3285 static ir_node *va_copy_expression_to_firm(const va_copy_expression_t *const expr)
3286 {
3287         ir_node *const src = expression_to_firm(expr->src);
3288         set_value_for_expression(expr->dst, src);
3289         return NULL;
3290 }
3291
3292 static ir_node *dereference_addr(const unary_expression_t *const expression)
3293 {
3294         assert(expression->base.kind == EXPR_UNARY_DEREFERENCE);
3295         return expression_to_firm(expression->value);
3296 }
3297
3298 /**
3299  * Returns a IR-node representing an lvalue of the given expression.
3300  */
3301 static ir_node *expression_to_addr(const expression_t *expression)
3302 {
3303         switch(expression->kind) {
3304         case EXPR_ARRAY_ACCESS:
3305                 return array_access_addr(&expression->array_access);
3306         case EXPR_CALL:
3307                 return call_expression_to_firm(&expression->call);
3308         case EXPR_COMPOUND_LITERAL:
3309                 return compound_literal_to_firm(&expression->compound_literal);
3310         case EXPR_REFERENCE:
3311                 return reference_addr(&expression->reference);
3312         case EXPR_SELECT:
3313                 return select_addr(&expression->select);
3314         case EXPR_UNARY_DEREFERENCE:
3315                 return dereference_addr(&expression->unary);
3316         default:
3317                 break;
3318         }
3319         panic("trying to get address of non-lvalue");
3320 }
3321
3322 static ir_node *builtin_constant_to_firm(
3323                 const builtin_constant_expression_t *expression)
3324 {
3325         ir_mode *const mode = get_ir_mode_arithmetic(expression->base.type);
3326         bool     const v    = is_constant_expression(expression->value) == EXPR_CLASS_CONSTANT;
3327         return create_Const_from_bool(mode, v);
3328 }
3329
3330 static ir_node *builtin_types_compatible_to_firm(
3331                 const builtin_types_compatible_expression_t *expression)
3332 {
3333         type_t  *const left  = get_unqualified_type(skip_typeref(expression->left));
3334         type_t  *const right = get_unqualified_type(skip_typeref(expression->right));
3335         bool     const value = types_compatible(left, right);
3336         ir_mode *const mode  = get_ir_mode_arithmetic(expression->base.type);
3337         return create_Const_from_bool(mode, value);
3338 }
3339
3340 static ir_node *get_label_block(label_t *label)
3341 {
3342         if (label->block != NULL)
3343                 return label->block;
3344
3345         /* beware: might be called from create initializer with current_ir_graph
3346          * set to const_code_irg. */
3347         ir_graph *rem    = current_ir_graph;
3348         current_ir_graph = current_function;
3349
3350         ir_node *block = new_immBlock();
3351
3352         label->block = block;
3353
3354         ARR_APP1(label_t *, all_labels, label);
3355
3356         current_ir_graph = rem;
3357         return block;
3358 }
3359
3360 /**
3361  * Pointer to a label.  This is used for the
3362  * GNU address-of-label extension.
3363  */
3364 static ir_node *label_address_to_firm(const label_address_expression_t *label)
3365 {
3366         dbg_info  *dbgi   = get_dbg_info(&label->base.source_position);
3367         ir_node   *block  = get_label_block(label->label);
3368         ir_entity *entity = create_Block_entity(block);
3369
3370         symconst_symbol value;
3371         value.entity_p = entity;
3372         return new_d_SymConst(dbgi, mode_P_code, value, symconst_addr_ent);
3373 }
3374
3375 static ir_node *error_to_firm(const expression_t *expression)
3376 {
3377         ir_mode *mode = get_ir_mode_arithmetic(expression->base.type);
3378         return new_Bad(mode);
3379 }
3380
3381 /**
3382  * creates firm nodes for an expression. The difference between this function
3383  * and expression_to_firm is, that this version might produce mode_b nodes
3384  * instead of mode_Is.
3385  */
3386 static ir_node *_expression_to_firm(const expression_t *expression)
3387 {
3388 #ifndef NDEBUG
3389         if (!constant_folding) {
3390                 assert(!expression->base.transformed);
3391                 ((expression_t*) expression)->base.transformed = true;
3392         }
3393 #endif
3394
3395         switch (expression->kind) {
3396         EXPR_LITERAL_CASES
3397                 return literal_to_firm(&expression->literal);
3398         case EXPR_STRING_LITERAL:
3399                 return string_to_firm(&expression->base.source_position, "str.%u",
3400                                       &expression->literal.value);
3401         case EXPR_WIDE_STRING_LITERAL:
3402                 return wide_string_literal_to_firm(&expression->string_literal);
3403         case EXPR_REFERENCE:
3404                 return reference_expression_to_firm(&expression->reference);
3405         case EXPR_REFERENCE_ENUM_VALUE:
3406                 return reference_expression_enum_value_to_firm(&expression->reference);
3407         case EXPR_CALL:
3408                 return call_expression_to_firm(&expression->call);
3409         EXPR_UNARY_CASES
3410                 return unary_expression_to_firm(&expression->unary);
3411         EXPR_BINARY_CASES
3412                 return binary_expression_to_firm(&expression->binary);
3413         case EXPR_ARRAY_ACCESS:
3414                 return array_access_to_firm(&expression->array_access);
3415         case EXPR_SIZEOF:
3416                 return sizeof_to_firm(&expression->typeprop);
3417         case EXPR_ALIGNOF:
3418                 return alignof_to_firm(&expression->typeprop);
3419         case EXPR_CONDITIONAL:
3420                 return conditional_to_firm(&expression->conditional);
3421         case EXPR_SELECT:
3422                 return select_to_firm(&expression->select);
3423         case EXPR_CLASSIFY_TYPE:
3424                 return classify_type_to_firm(&expression->classify_type);
3425         case EXPR_FUNCNAME:
3426                 return function_name_to_firm(&expression->funcname);
3427         case EXPR_STATEMENT:
3428                 return statement_expression_to_firm(&expression->statement);
3429         case EXPR_VA_START:
3430                 return va_start_expression_to_firm(&expression->va_starte);
3431         case EXPR_VA_ARG:
3432                 return va_arg_expression_to_firm(&expression->va_arge);
3433         case EXPR_VA_COPY:
3434                 return va_copy_expression_to_firm(&expression->va_copye);
3435         case EXPR_BUILTIN_CONSTANT_P:
3436                 return builtin_constant_to_firm(&expression->builtin_constant);
3437         case EXPR_BUILTIN_TYPES_COMPATIBLE_P:
3438                 return builtin_types_compatible_to_firm(&expression->builtin_types_compatible);
3439         case EXPR_OFFSETOF:
3440                 return offsetof_to_firm(&expression->offsetofe);
3441         case EXPR_COMPOUND_LITERAL:
3442                 return compound_literal_to_firm(&expression->compound_literal);
3443         case EXPR_LABEL_ADDRESS:
3444                 return label_address_to_firm(&expression->label_address);
3445
3446         case EXPR_ERROR:
3447                 return error_to_firm(expression);
3448         }
3449         panic("invalid expression found");
3450 }
3451
3452 /**
3453  * Check if a given expression is a GNU __builtin_expect() call.
3454  */
3455 static bool is_builtin_expect(const expression_t *expression)
3456 {
3457         if (expression->kind != EXPR_CALL)
3458                 return false;
3459
3460         expression_t *function = expression->call.function;
3461         if (function->kind != EXPR_REFERENCE)
3462                 return false;
3463         reference_expression_t *ref = &function->reference;
3464         if (ref->entity->kind         != ENTITY_FUNCTION ||
3465             ref->entity->function.btk != BUILTIN_EXPECT)
3466                 return false;
3467
3468         return true;
3469 }
3470
3471 static bool produces_mode_b(const expression_t *expression)
3472 {
3473         switch (expression->kind) {
3474         case EXPR_BINARY_EQUAL:
3475         case EXPR_BINARY_NOTEQUAL:
3476         case EXPR_BINARY_LESS:
3477         case EXPR_BINARY_LESSEQUAL:
3478         case EXPR_BINARY_GREATER:
3479         case EXPR_BINARY_GREATEREQUAL:
3480         case EXPR_BINARY_ISGREATER:
3481         case EXPR_BINARY_ISGREATEREQUAL:
3482         case EXPR_BINARY_ISLESS:
3483         case EXPR_BINARY_ISLESSEQUAL:
3484         case EXPR_BINARY_ISLESSGREATER:
3485         case EXPR_BINARY_ISUNORDERED:
3486         case EXPR_UNARY_NOT:
3487                 return true;
3488
3489         case EXPR_CALL:
3490                 if (is_builtin_expect(expression)) {
3491                         expression_t *argument = expression->call.arguments->expression;
3492                         return produces_mode_b(argument);
3493                 }
3494                 return false;
3495         case EXPR_BINARY_COMMA:
3496                 return produces_mode_b(expression->binary.right);
3497
3498         default:
3499                 return false;
3500         }
3501 }
3502
3503 static ir_node *expression_to_firm(const expression_t *expression)
3504 {
3505         if (!produces_mode_b(expression)) {
3506                 ir_node *res = _expression_to_firm(expression);
3507                 assert(res == NULL || get_irn_mode(res) != mode_b);
3508                 return res;
3509         }
3510
3511         if (is_constant_expression(expression) == EXPR_CLASS_CONSTANT) {
3512                 bool const constant_folding_old = constant_folding;
3513                 constant_folding = true;
3514                 ir_node *res  = _expression_to_firm(expression);
3515                 constant_folding = constant_folding_old;
3516                 ir_mode *mode = get_ir_mode_arithmetic(expression->base.type);
3517                 assert(is_Const(res));
3518                 return create_Const_from_bool(mode, !is_Const_null(res));
3519         }
3520
3521         /* we have to produce a 0/1 from the mode_b expression */
3522         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3523         ir_mode  *mode = get_ir_mode_arithmetic(expression->base.type);
3524         return produce_condition_result(expression, mode, dbgi);
3525 }
3526
3527 /**
3528  * create a short-circuit expression evaluation that tries to construct
3529  * efficient control flow structures for &&, || and ! expressions
3530  */
3531 static ir_node *create_condition_evaluation(const expression_t *expression,
3532                                             ir_node *true_block,
3533                                             ir_node *false_block)
3534 {
3535         switch(expression->kind) {
3536         case EXPR_UNARY_NOT: {
3537                 const unary_expression_t *unary_expression = &expression->unary;
3538                 create_condition_evaluation(unary_expression->value, false_block,
3539                                             true_block);
3540                 return NULL;
3541         }
3542         case EXPR_BINARY_LOGICAL_AND: {
3543                 const binary_expression_t *binary_expression = &expression->binary;
3544
3545                 ir_node *extra_block = new_immBlock();
3546                 create_condition_evaluation(binary_expression->left, extra_block,
3547                                             false_block);
3548                 mature_immBlock(extra_block);
3549                 set_cur_block(extra_block);
3550                 create_condition_evaluation(binary_expression->right, true_block,
3551                                             false_block);
3552                 return NULL;
3553         }
3554         case EXPR_BINARY_LOGICAL_OR: {
3555                 const binary_expression_t *binary_expression = &expression->binary;
3556
3557                 ir_node *extra_block = new_immBlock();
3558                 create_condition_evaluation(binary_expression->left, true_block,
3559                                             extra_block);
3560                 mature_immBlock(extra_block);
3561                 set_cur_block(extra_block);
3562                 create_condition_evaluation(binary_expression->right, true_block,
3563                                             false_block);
3564                 return NULL;
3565         }
3566         default:
3567                 break;
3568         }
3569
3570         dbg_info *dbgi       = get_dbg_info(&expression->base.source_position);
3571         ir_node  *cond_expr  = _expression_to_firm(expression);
3572         ir_node  *condition  = create_conv(dbgi, cond_expr, mode_b);
3573         ir_node  *cond       = new_d_Cond(dbgi, condition);
3574         ir_node  *true_proj  = new_d_Proj(dbgi, cond, mode_X, pn_Cond_true);
3575         ir_node  *false_proj = new_d_Proj(dbgi, cond, mode_X, pn_Cond_false);
3576
3577         /* set branch prediction info based on __builtin_expect */
3578         if (is_builtin_expect(expression) && is_Cond(cond)) {
3579                 call_argument_t *argument = expression->call.arguments->next;
3580                 if (is_constant_expression(argument->expression) == EXPR_CLASS_CONSTANT) {
3581                         bool               const cnst = fold_constant_to_bool(argument->expression);
3582                         cond_jmp_predicate const pred = cnst ? COND_JMP_PRED_TRUE : COND_JMP_PRED_FALSE;
3583                         set_Cond_jmp_pred(cond, pred);
3584                 }
3585         }
3586
3587         add_immBlock_pred(true_block, true_proj);
3588         add_immBlock_pred(false_block, false_proj);
3589
3590         set_unreachable_now();
3591         return cond_expr;
3592 }
3593
3594 static void create_variable_entity(entity_t *variable,
3595                                    declaration_kind_t declaration_kind,
3596                                    ir_type *parent_type)
3597 {
3598         assert(variable->kind == ENTITY_VARIABLE);
3599         type_t    *type = skip_typeref(variable->declaration.type);
3600
3601         ident     *const id        = new_id_from_str(variable->base.symbol->string);
3602         ir_type   *const irtype    = get_ir_type(type);
3603         dbg_info  *const dbgi      = get_dbg_info(&variable->base.source_position);
3604         ir_entity *const irentity  = new_d_entity(parent_type, id, irtype, dbgi);
3605         unsigned         alignment = variable->declaration.alignment;
3606
3607         set_entity_alignment(irentity, alignment);
3608
3609         handle_decl_modifiers(irentity, variable);
3610
3611         variable->declaration.kind  = (unsigned char) declaration_kind;
3612         variable->variable.v.entity = irentity;
3613         set_entity_ld_ident(irentity, create_ld_ident(variable));
3614
3615         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
3616                 set_entity_volatility(irentity, volatility_is_volatile);
3617         }
3618 }
3619
3620
3621 typedef struct type_path_entry_t type_path_entry_t;
3622 struct type_path_entry_t {
3623         type_t           *type;
3624         ir_initializer_t *initializer;
3625         size_t            index;
3626         entity_t         *compound_entry;
3627 };
3628
3629 typedef struct type_path_t type_path_t;
3630 struct type_path_t {
3631         type_path_entry_t *path;
3632         type_t            *top_type;
3633         bool               invalid;
3634 };
3635
3636 static __attribute__((unused)) void debug_print_type_path(const type_path_t *path)
3637 {
3638         size_t len = ARR_LEN(path->path);
3639
3640         for (size_t i = 0; i < len; ++i) {
3641                 const type_path_entry_t *entry = & path->path[i];
3642
3643                 type_t *type = skip_typeref(entry->type);
3644                 if (is_type_compound(type)) {
3645                         fprintf(stderr, ".%s", entry->compound_entry->base.symbol->string);
3646                 } else if (is_type_array(type)) {
3647                         fprintf(stderr, "[%u]", (unsigned) entry->index);
3648                 } else {
3649                         fprintf(stderr, "-INVALID-");
3650                 }
3651         }
3652         fprintf(stderr, "  (");
3653         print_type(path->top_type);
3654         fprintf(stderr, ")");
3655 }
3656
3657 static type_path_entry_t *get_type_path_top(const type_path_t *path)
3658 {
3659         size_t len = ARR_LEN(path->path);
3660         assert(len > 0);
3661         return & path->path[len-1];
3662 }
3663
3664 static type_path_entry_t *append_to_type_path(type_path_t *path)
3665 {
3666         size_t len = ARR_LEN(path->path);
3667         ARR_RESIZE(type_path_entry_t, path->path, len+1);
3668
3669         type_path_entry_t *result = & path->path[len];
3670         memset(result, 0, sizeof(result[0]));
3671         return result;
3672 }
3673
3674 static size_t get_compound_member_count(const compound_type_t *type)
3675 {
3676         compound_t *compound  = type->compound;
3677         size_t      n_members = 0;
3678         entity_t   *member    = compound->members.entities;
3679         for ( ; member != NULL; member = member->base.next) {
3680                 ++n_members;
3681         }
3682
3683         return n_members;
3684 }
3685
3686 static ir_initializer_t *get_initializer_entry(type_path_t *path)
3687 {
3688         type_t *orig_top_type = path->top_type;
3689         type_t *top_type      = skip_typeref(orig_top_type);
3690
3691         assert(is_type_compound(top_type) || is_type_array(top_type));
3692
3693         if (ARR_LEN(path->path) == 0) {
3694                 return NULL;
3695         } else {
3696                 type_path_entry_t *top         = get_type_path_top(path);
3697                 ir_initializer_t  *initializer = top->initializer;
3698                 return get_initializer_compound_value(initializer, top->index);
3699         }
3700 }
3701
3702 static void descend_into_subtype(type_path_t *path)
3703 {
3704         type_t *orig_top_type = path->top_type;
3705         type_t *top_type      = skip_typeref(orig_top_type);
3706
3707         assert(is_type_compound(top_type) || is_type_array(top_type));
3708
3709         ir_initializer_t *initializer = get_initializer_entry(path);
3710
3711         type_path_entry_t *top = append_to_type_path(path);
3712         top->type              = top_type;
3713
3714         size_t len;
3715
3716         if (is_type_compound(top_type)) {
3717                 compound_t *const compound = top_type->compound.compound;
3718                 entity_t   *const entry    = skip_unnamed_bitfields(compound->members.entities);
3719
3720                 top->compound_entry = entry;
3721                 top->index          = 0;
3722                 len                 = get_compound_member_count(&top_type->compound);
3723                 if (entry != NULL) {
3724                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3725                         path->top_type = entry->declaration.type;
3726                 }
3727         } else {
3728                 assert(is_type_array(top_type));
3729                 assert(top_type->array.size > 0);
3730
3731                 top->index     = 0;
3732                 path->top_type = top_type->array.element_type;
3733                 len            = top_type->array.size;
3734         }
3735         if (initializer == NULL
3736                         || get_initializer_kind(initializer) == IR_INITIALIZER_NULL) {
3737                 initializer = create_initializer_compound(len);
3738                 /* we have to set the entry at the 2nd latest path entry... */
3739                 size_t path_len = ARR_LEN(path->path);
3740                 assert(path_len >= 1);
3741                 if (path_len > 1) {
3742                         type_path_entry_t *entry        = & path->path[path_len-2];
3743                         ir_initializer_t  *tinitializer = entry->initializer;
3744                         set_initializer_compound_value(tinitializer, entry->index,
3745                                                        initializer);
3746                 }
3747         }
3748         top->initializer = initializer;
3749 }
3750
3751 static void ascend_from_subtype(type_path_t *path)
3752 {
3753         type_path_entry_t *top = get_type_path_top(path);
3754
3755         path->top_type = top->type;
3756
3757         size_t len = ARR_LEN(path->path);
3758         ARR_RESIZE(type_path_entry_t, path->path, len-1);
3759 }
3760
3761 static void walk_designator(type_path_t *path, const designator_t *designator)
3762 {
3763         /* designators start at current object type */
3764         ARR_RESIZE(type_path_entry_t, path->path, 1);
3765
3766         for ( ; designator != NULL; designator = designator->next) {
3767                 type_path_entry_t *top         = get_type_path_top(path);
3768                 type_t            *orig_type   = top->type;
3769                 type_t            *type        = skip_typeref(orig_type);
3770
3771                 if (designator->symbol != NULL) {
3772                         assert(is_type_compound(type));
3773                         size_t    index  = 0;
3774                         symbol_t *symbol = designator->symbol;
3775
3776                         compound_t *compound = type->compound.compound;
3777                         entity_t   *iter     = compound->members.entities;
3778                         for ( ; iter != NULL; iter = iter->base.next, ++index) {
3779                                 if (iter->base.symbol == symbol) {
3780                                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
3781                                         break;
3782                                 }
3783                         }
3784                         assert(iter != NULL);
3785
3786                         /* revert previous initialisations of other union elements */
3787                         if (type->kind == TYPE_COMPOUND_UNION) {
3788                                 ir_initializer_t *initializer = top->initializer;
3789                                 if (initializer != NULL
3790                                         && get_initializer_kind(initializer) == IR_INITIALIZER_COMPOUND) {
3791                                         /* are we writing to a new element? */
3792                                         ir_initializer_t *oldi
3793                                                 = get_initializer_compound_value(initializer, index);
3794                                         if (get_initializer_kind(oldi) == IR_INITIALIZER_NULL) {
3795                                                 /* clear initializer */
3796                                                 size_t len
3797                                                         = get_initializer_compound_n_entries(initializer);
3798                                                 ir_initializer_t *nulli = get_initializer_null();
3799                                                 for (size_t i = 0; i < len; ++i) {
3800                                                         set_initializer_compound_value(initializer, i,
3801                                                                                        nulli);
3802                                                 }
3803                                         }
3804                                 }
3805                         }
3806
3807                         top->type           = orig_type;
3808                         top->compound_entry = iter;
3809                         top->index          = index;
3810                         orig_type           = iter->declaration.type;
3811                 } else {
3812                         expression_t *array_index = designator->array_index;
3813                         assert(designator->array_index != NULL);
3814                         assert(is_type_array(type));
3815
3816                         long index = fold_constant_to_int(array_index);
3817                         assert(index >= 0);
3818 #ifndef NDEBUG
3819                         if (type->array.size_constant) {
3820                                 long array_size = type->array.size;
3821                                 assert(index < array_size);
3822                         }
3823 #endif
3824
3825                         top->type  = orig_type;
3826                         top->index = (size_t) index;
3827                         orig_type  = type->array.element_type;
3828                 }
3829                 path->top_type = orig_type;
3830
3831                 if (designator->next != NULL) {
3832                         descend_into_subtype(path);
3833                 }
3834         }
3835
3836         path->invalid  = false;
3837 }
3838
3839 static void advance_current_object(type_path_t *path)
3840 {
3841         if (path->invalid) {
3842                 /* TODO: handle this... */
3843                 panic("invalid initializer in ast2firm (excessive elements)");
3844         }
3845
3846         type_path_entry_t *top = get_type_path_top(path);
3847
3848         type_t *type = skip_typeref(top->type);
3849         if (is_type_union(type)) {
3850                 /* only the first element is initialized in unions */
3851                 top->compound_entry = NULL;
3852         } else if (is_type_struct(type)) {
3853                 entity_t *entry = top->compound_entry;
3854
3855                 top->index++;
3856                 entry               = skip_unnamed_bitfields(entry->base.next);
3857                 top->compound_entry = entry;
3858                 if (entry != NULL) {
3859                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3860                         path->top_type = entry->declaration.type;
3861                         return;
3862                 }
3863         } else {
3864                 assert(is_type_array(type));
3865
3866                 top->index++;
3867                 if (!type->array.size_constant || top->index < type->array.size) {
3868                         return;
3869                 }
3870         }
3871
3872         /* we're past the last member of the current sub-aggregate, try if we
3873          * can ascend in the type hierarchy and continue with another subobject */
3874         size_t len = ARR_LEN(path->path);
3875
3876         if (len > 1) {
3877                 ascend_from_subtype(path);
3878                 advance_current_object(path);
3879         } else {
3880                 path->invalid = true;
3881         }
3882 }
3883
3884
3885 static ir_initializer_t *create_ir_initializer(
3886                 const initializer_t *initializer, type_t *type);
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 the ir_initializer */
4240         ir_graph *const old_current_ir_graph = current_ir_graph;
4241         current_ir_graph = get_const_code_irg();
4242
4243         ir_initializer_t *irinitializer = create_ir_initializer(initializer, type);
4244
4245         assert(current_ir_graph == get_const_code_irg());
4246         current_ir_graph = old_current_ir_graph;
4247
4248         /* create a "template" entity which is copied to the entity on the stack */
4249         ident     *const id          = id_unique("initializer.%u");
4250         ir_type   *const irtype      = get_ir_type(type);
4251         ir_type   *const global_type = get_glob_type();
4252         ir_entity *const init_entity = new_d_entity(global_type, id, irtype, dbgi);
4253         set_entity_ld_ident(init_entity, id);
4254
4255         set_entity_visibility(init_entity, ir_visibility_private);
4256         add_entity_linkage(init_entity, IR_LINKAGE_CONSTANT);
4257
4258         set_entity_initializer(init_entity, irinitializer);
4259
4260         ir_node *const src_addr = create_symconst(dbgi, init_entity);
4261         ir_node *const copyb    = new_d_CopyB(dbgi, memory, addr, src_addr, irtype);
4262
4263         ir_node *const copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
4264         set_store(copyb_mem);
4265 }
4266
4267 static void create_initializer_local_variable_entity(entity_t *entity)
4268 {
4269         assert(entity->kind == ENTITY_VARIABLE);
4270         initializer_t *initializer = entity->variable.initializer;
4271         dbg_info      *dbgi        = get_dbg_info(&entity->base.source_position);
4272         ir_entity     *irentity    = entity->variable.v.entity;
4273         type_t        *type        = entity->declaration.type;
4274
4275         create_local_initializer(initializer, dbgi, irentity, type);
4276 }
4277
4278 static void create_variable_initializer(entity_t *entity)
4279 {
4280         assert(entity->kind == ENTITY_VARIABLE);
4281         initializer_t *initializer = entity->variable.initializer;
4282         if (initializer == NULL)
4283                 return;
4284
4285         declaration_kind_t declaration_kind
4286                 = (declaration_kind_t) entity->declaration.kind;
4287         if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY) {
4288                 create_initializer_local_variable_entity(entity);
4289                 return;
4290         }
4291
4292         type_t            *type = entity->declaration.type;
4293         type_qualifiers_t  tq   = get_type_qualifier(type, true);
4294
4295         if (initializer->kind == INITIALIZER_VALUE) {
4296                 initializer_value_t *initializer_value = &initializer->value;
4297                 dbg_info            *dbgi = get_dbg_info(&entity->base.source_position);
4298
4299                 ir_node *value = expression_to_firm(initializer_value->value);
4300
4301                 type_t  *init_type = initializer_value->value->base.type;
4302                 ir_mode *mode      = get_ir_mode_storage(init_type);
4303                 value = create_conv(dbgi, value, mode);
4304                 value = do_strict_conv(dbgi, value);
4305
4306                 if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE) {
4307                         set_value(entity->variable.v.value_number, value);
4308                 } else {
4309                         assert(declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4310
4311                         ir_entity *irentity = entity->variable.v.entity;
4312
4313                         if (tq & TYPE_QUALIFIER_CONST
4314                                         && get_entity_owner(irentity) != get_tls_type()) {
4315                                 add_entity_linkage(irentity, IR_LINKAGE_CONSTANT);
4316                         }
4317                         set_atomic_ent_value(irentity, value);
4318                 }
4319         } else {
4320                 assert(declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY ||
4321                        declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4322
4323                 ir_entity        *irentity        = entity->variable.v.entity;
4324                 ir_initializer_t *irinitializer
4325                         = create_ir_initializer(initializer, type);
4326
4327                 if (tq & TYPE_QUALIFIER_CONST) {
4328                         add_entity_linkage(irentity, IR_LINKAGE_CONSTANT);
4329                 }
4330                 set_entity_initializer(irentity, irinitializer);
4331         }
4332 }
4333
4334 static void create_variable_length_array(entity_t *entity)
4335 {
4336         assert(entity->kind == ENTITY_VARIABLE);
4337         assert(entity->variable.initializer == NULL);
4338
4339         entity->declaration.kind    = DECLARATION_KIND_VARIABLE_LENGTH_ARRAY;
4340         entity->variable.v.vla_base = NULL;
4341
4342         /* TODO: record VLA somewhere so we create the free node when we leave
4343          * it's scope */
4344 }
4345
4346 static void allocate_variable_length_array(entity_t *entity)
4347 {
4348         assert(entity->kind == ENTITY_VARIABLE);
4349         assert(entity->variable.initializer == NULL);
4350         assert(currently_reachable());
4351
4352         dbg_info *dbgi      = get_dbg_info(&entity->base.source_position);
4353         type_t   *type      = entity->declaration.type;
4354         ir_type  *el_type   = get_ir_type(type->array.element_type);
4355
4356         /* make sure size_node is calculated */
4357         get_type_size_node(type);
4358         ir_node  *elems = type->array.size_node;
4359         ir_node  *mem   = get_store();
4360         ir_node  *alloc = new_d_Alloc(dbgi, mem, elems, el_type, stack_alloc);
4361
4362         ir_node  *proj_m = new_d_Proj(dbgi, alloc, mode_M, pn_Alloc_M);
4363         ir_node  *addr   = new_d_Proj(dbgi, alloc, mode_P_data, pn_Alloc_res);
4364         set_store(proj_m);
4365
4366         assert(entity->declaration.kind == DECLARATION_KIND_VARIABLE_LENGTH_ARRAY);
4367         entity->variable.v.vla_base = addr;
4368 }
4369
4370 /**
4371  * Creates a Firm local variable from a declaration.
4372  */
4373 static void create_local_variable(entity_t *entity)
4374 {
4375         assert(entity->kind == ENTITY_VARIABLE);
4376         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4377
4378         bool needs_entity = entity->variable.address_taken;
4379         type_t *type = skip_typeref(entity->declaration.type);
4380
4381         /* is it a variable length array? */
4382         if (is_type_array(type) && !type->array.size_constant) {
4383                 create_variable_length_array(entity);
4384                 return;
4385         } else if (is_type_array(type) || is_type_compound(type)) {
4386                 needs_entity = true;
4387         } else if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
4388                 needs_entity = true;
4389         }
4390
4391         if (needs_entity) {
4392                 ir_type *frame_type = get_irg_frame_type(current_ir_graph);
4393                 create_variable_entity(entity,
4394                                        DECLARATION_KIND_LOCAL_VARIABLE_ENTITY,
4395                                        frame_type);
4396         } else {
4397                 entity->declaration.kind        = DECLARATION_KIND_LOCAL_VARIABLE;
4398                 entity->variable.v.value_number = next_value_number_function;
4399                 set_irg_loc_description(current_ir_graph, next_value_number_function,
4400                                         entity);
4401                 ++next_value_number_function;
4402         }
4403 }
4404
4405 static void create_local_static_variable(entity_t *entity)
4406 {
4407         assert(entity->kind == ENTITY_VARIABLE);
4408         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4409
4410         type_t   *type           = skip_typeref(entity->declaration.type);
4411         ir_type  *const var_type = entity->variable.thread_local ?
4412                 get_tls_type() : get_glob_type();
4413         ir_type  *const irtype   = get_ir_type(type);
4414         dbg_info *const dbgi     = get_dbg_info(&entity->base.source_position);
4415
4416         size_t l = strlen(entity->base.symbol->string);
4417         char   buf[l + sizeof(".%u")];
4418         snprintf(buf, sizeof(buf), "%s.%%u", entity->base.symbol->string);
4419         ident     *const id       = id_unique(buf);
4420         ir_entity *const irentity = new_d_entity(var_type, id, irtype, dbgi);
4421
4422         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
4423                 set_entity_volatility(irentity, volatility_is_volatile);
4424         }
4425
4426         entity->declaration.kind  = DECLARATION_KIND_GLOBAL_VARIABLE;
4427         entity->variable.v.entity = irentity;
4428
4429         set_entity_ld_ident(irentity, id);
4430         set_entity_visibility(irentity, ir_visibility_local);
4431
4432         ir_graph *const old_current_ir_graph = current_ir_graph;
4433         current_ir_graph = get_const_code_irg();
4434
4435         create_variable_initializer(entity);
4436
4437         assert(current_ir_graph == get_const_code_irg());
4438         current_ir_graph = old_current_ir_graph;
4439 }
4440
4441
4442
4443 static void return_statement_to_firm(return_statement_t *statement)
4444 {
4445         if (!currently_reachable())
4446                 return;
4447
4448         dbg_info *dbgi        = get_dbg_info(&statement->base.source_position);
4449         type_t   *type        = current_function_entity->declaration.type;
4450         ir_type  *func_irtype = get_ir_type(type);
4451
4452         ir_node *in[1];
4453         int      in_len;
4454         if (get_method_n_ress(func_irtype) > 0) {
4455                 ir_type *res_type = get_method_res_type(func_irtype, 0);
4456
4457                 if (statement->value != NULL) {
4458                         ir_node *node = expression_to_firm(statement->value);
4459                         if (!is_compound_type(res_type)) {
4460                                 type_t  *ret_value_type = statement->value->base.type;
4461                                 ir_mode *mode           = get_ir_mode_storage(ret_value_type);
4462                                 node                    = create_conv(dbgi, node, mode);
4463                                 node                    = do_strict_conv(dbgi, node);
4464                         }
4465                         in[0] = node;
4466                 } else {
4467                         ir_mode *mode;
4468                         if (is_compound_type(res_type)) {
4469                                 mode = mode_P_data;
4470                         } else {
4471                                 mode = get_type_mode(res_type);
4472                         }
4473                         in[0] = new_Unknown(mode);
4474                 }
4475                 in_len = 1;
4476         } else {
4477                 /* build return_value for its side effects */
4478                 if (statement->value != NULL) {
4479                         expression_to_firm(statement->value);
4480                 }
4481                 in_len = 0;
4482         }
4483
4484         ir_node  *store = get_store();
4485         ir_node  *ret   = new_d_Return(dbgi, store, in_len, in);
4486
4487         ir_node *end_block = get_irg_end_block(current_ir_graph);
4488         add_immBlock_pred(end_block, ret);
4489
4490         set_unreachable_now();
4491 }
4492
4493 static ir_node *expression_statement_to_firm(expression_statement_t *statement)
4494 {
4495         if (!currently_reachable())
4496                 return NULL;
4497
4498         return expression_to_firm(statement->expression);
4499 }
4500
4501 static ir_node *compound_statement_to_firm(compound_statement_t *compound)
4502 {
4503         entity_t *entity = compound->scope.entities;
4504         for ( ; entity != NULL; entity = entity->base.next) {
4505                 if (!is_declaration(entity))
4506                         continue;
4507
4508                 create_local_declaration(entity);
4509         }
4510
4511         ir_node     *result    = NULL;
4512         statement_t *statement = compound->statements;
4513         for ( ; statement != NULL; statement = statement->base.next) {
4514                 if (statement->base.next == NULL
4515                                 && statement->kind == STATEMENT_EXPRESSION) {
4516                         result = expression_statement_to_firm(
4517                                         &statement->expression);
4518                         break;
4519                 }
4520                 statement_to_firm(statement);
4521         }
4522
4523         return result;
4524 }
4525
4526 static void create_global_variable(entity_t *entity)
4527 {
4528         ir_linkage    linkage    = IR_LINKAGE_DEFAULT;
4529         ir_visibility visibility = ir_visibility_default;
4530         ir_entity    *irentity;
4531         assert(entity->kind == ENTITY_VARIABLE);
4532
4533         switch ((storage_class_tag_t)entity->declaration.storage_class) {
4534         case STORAGE_CLASS_EXTERN: visibility = ir_visibility_external; break;
4535         case STORAGE_CLASS_STATIC: visibility = ir_visibility_local;    break;
4536         case STORAGE_CLASS_NONE:
4537                 visibility = ir_visibility_default;
4538                 /* uninitialized globals get merged in C */
4539                 if (entity->variable.initializer == NULL)
4540                         linkage |= IR_LINKAGE_MERGE;
4541                 break;
4542         case STORAGE_CLASS_TYPEDEF:
4543         case STORAGE_CLASS_AUTO:
4544         case STORAGE_CLASS_REGISTER:
4545                 panic("invalid storage class for global var");
4546         }
4547
4548         ir_type *var_type = get_glob_type();
4549         if (entity->variable.thread_local) {
4550                 var_type = get_tls_type();
4551                 /* LINKAGE_MERGE not supported by current linkers */
4552                 linkage &= ~IR_LINKAGE_MERGE;
4553         }
4554         create_variable_entity(entity, DECLARATION_KIND_GLOBAL_VARIABLE, var_type);
4555         irentity = entity->variable.v.entity;
4556         add_entity_linkage(irentity, linkage);
4557         set_entity_visibility(irentity, visibility);
4558 }
4559
4560 static void create_local_declaration(entity_t *entity)
4561 {
4562         assert(is_declaration(entity));
4563
4564         /* construct type */
4565         (void) get_ir_type(entity->declaration.type);
4566         if (entity->base.symbol == NULL) {
4567                 return;
4568         }
4569
4570         switch ((storage_class_tag_t) entity->declaration.storage_class) {
4571         case STORAGE_CLASS_STATIC:
4572                 if (entity->kind == ENTITY_FUNCTION) {
4573                         (void)get_function_entity(entity, NULL);
4574                 } else {
4575                         create_local_static_variable(entity);
4576                 }
4577                 return;
4578         case STORAGE_CLASS_EXTERN:
4579                 if (entity->kind == ENTITY_FUNCTION) {
4580                         assert(entity->function.statement == NULL);
4581                         (void)get_function_entity(entity, NULL);
4582                 } else {
4583                         create_global_variable(entity);
4584                         create_variable_initializer(entity);
4585                 }
4586                 return;
4587         case STORAGE_CLASS_NONE:
4588         case STORAGE_CLASS_AUTO:
4589         case STORAGE_CLASS_REGISTER:
4590                 if (entity->kind == ENTITY_FUNCTION) {
4591                         if (entity->function.statement != NULL) {
4592                                 ir_type *owner = get_irg_frame_type(current_ir_graph);
4593                                 (void)get_function_entity(entity, owner);
4594                                 entity->declaration.kind = DECLARATION_KIND_INNER_FUNCTION;
4595                                 enqueue_inner_function(entity);
4596                         } else {
4597                                 (void)get_function_entity(entity, NULL);
4598                         }
4599                 } else {
4600                         create_local_variable(entity);
4601                 }
4602                 return;
4603         case STORAGE_CLASS_TYPEDEF:
4604                 break;
4605         }
4606         panic("invalid storage class found");
4607 }
4608
4609 static void initialize_local_declaration(entity_t *entity)
4610 {
4611         if (entity->base.symbol == NULL)
4612                 return;
4613
4614         // no need to emit code in dead blocks
4615         if (entity->declaration.storage_class != STORAGE_CLASS_STATIC
4616                         && !currently_reachable())
4617                 return;
4618
4619         switch ((declaration_kind_t) entity->declaration.kind) {
4620         case DECLARATION_KIND_LOCAL_VARIABLE:
4621         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY:
4622                 create_variable_initializer(entity);
4623                 return;
4624
4625         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
4626                 allocate_variable_length_array(entity);
4627                 return;
4628
4629         case DECLARATION_KIND_COMPOUND_MEMBER:
4630         case DECLARATION_KIND_GLOBAL_VARIABLE:
4631         case DECLARATION_KIND_FUNCTION:
4632         case DECLARATION_KIND_INNER_FUNCTION:
4633                 return;
4634
4635         case DECLARATION_KIND_PARAMETER:
4636         case DECLARATION_KIND_PARAMETER_ENTITY:
4637                 panic("can't initialize parameters");
4638
4639         case DECLARATION_KIND_UNKNOWN:
4640                 panic("can't initialize unknown declaration");
4641         }
4642         panic("invalid declaration kind");
4643 }
4644
4645 static void declaration_statement_to_firm(declaration_statement_t *statement)
4646 {
4647         entity_t *entity = statement->declarations_begin;
4648         if (entity == NULL)
4649                 return;
4650
4651         entity_t *const last = statement->declarations_end;
4652         for ( ;; entity = entity->base.next) {
4653                 if (is_declaration(entity)) {
4654                         initialize_local_declaration(entity);
4655                 } else if (entity->kind == ENTITY_TYPEDEF) {
4656                         /* §6.7.7:3  Any array size expressions associated with variable length
4657                          * array declarators are evaluated each time the declaration of the
4658                          * typedef name is reached in the order of execution. */
4659                         type_t *const type = skip_typeref(entity->typedefe.type);
4660                         if (is_type_array(type) && type->array.is_vla)
4661                                 get_vla_size(&type->array);
4662                 }
4663                 if (entity == last)
4664                         break;
4665         }
4666 }
4667
4668 static void if_statement_to_firm(if_statement_t *statement)
4669 {
4670         /* Create the condition. */
4671         ir_node *true_block  = NULL;
4672         ir_node *false_block = NULL;
4673         if (currently_reachable()) {
4674                 true_block  = new_immBlock();
4675                 false_block = new_immBlock();
4676                 create_condition_evaluation(statement->condition, true_block, false_block);
4677                 mature_immBlock(true_block);
4678         }
4679
4680         /* Create the false statement.
4681          * Handle false before true, so if no false statement is present, then the
4682          * empty false block is reused as fallthrough block. */
4683         ir_node *fallthrough_block = NULL;
4684         if (statement->false_statement != NULL) {
4685                 if (false_block != NULL) {
4686                         mature_immBlock(false_block);
4687                 }
4688                 set_cur_block(false_block);
4689                 statement_to_firm(statement->false_statement);
4690                 if (currently_reachable()) {
4691                         fallthrough_block = new_immBlock();
4692                         add_immBlock_pred(fallthrough_block, new_Jmp());
4693                 }
4694         } else {
4695                 fallthrough_block = false_block;
4696         }
4697
4698         /* Create the true statement. */
4699         set_cur_block(true_block);
4700         statement_to_firm(statement->true_statement);
4701         if (currently_reachable()) {
4702                 if (fallthrough_block == NULL) {
4703                         fallthrough_block = new_immBlock();
4704                 }
4705                 add_immBlock_pred(fallthrough_block, new_Jmp());
4706         }
4707
4708         /* Handle the block after the if-statement. */
4709         if (fallthrough_block != NULL) {
4710                 mature_immBlock(fallthrough_block);
4711         }
4712         set_cur_block(fallthrough_block);
4713 }
4714
4715 /* Create a jump node which jumps into target_block, if the current block is
4716  * reachable. */
4717 static void jump_if_reachable(ir_node *const target_block)
4718 {
4719         ir_node *const pred = currently_reachable() ? new_Jmp() : new_Bad(mode_X);
4720         add_immBlock_pred(target_block, pred);
4721 }
4722
4723 static void while_statement_to_firm(while_statement_t *statement)
4724 {
4725         /* Create the header block */
4726         ir_node *const header_block = new_immBlock();
4727         jump_if_reachable(header_block);
4728
4729         /* Create the condition. */
4730         ir_node      *      body_block;
4731         ir_node      *      false_block;
4732         expression_t *const cond = statement->condition;
4733         if (is_constant_expression(cond) == EXPR_CLASS_CONSTANT &&
4734                         fold_constant_to_bool(cond)) {
4735                 /* Shortcut for while (true). */
4736                 body_block  = header_block;
4737                 false_block = NULL;
4738
4739                 keep_alive(header_block);
4740                 keep_all_memory(header_block);
4741         } else {
4742                 body_block  = new_immBlock();
4743                 false_block = new_immBlock();
4744
4745                 set_cur_block(header_block);
4746                 create_condition_evaluation(cond, body_block, false_block);
4747                 mature_immBlock(body_block);
4748         }
4749
4750         ir_node *const old_continue_label = continue_label;
4751         ir_node *const old_break_label    = break_label;
4752         continue_label = header_block;
4753         break_label    = false_block;
4754
4755         /* Create the loop body. */
4756         set_cur_block(body_block);
4757         statement_to_firm(statement->body);
4758         jump_if_reachable(header_block);
4759
4760         mature_immBlock(header_block);
4761         assert(false_block == NULL || false_block == break_label);
4762         false_block = break_label;
4763         if (false_block != NULL) {
4764                 mature_immBlock(false_block);
4765         }
4766         set_cur_block(false_block);
4767
4768         assert(continue_label == header_block);
4769         continue_label = old_continue_label;
4770         break_label    = old_break_label;
4771 }
4772
4773 static ir_node *get_break_label(void)
4774 {
4775         if (break_label == NULL) {
4776                 break_label = new_immBlock();
4777         }
4778         return break_label;
4779 }
4780
4781 static void do_while_statement_to_firm(do_while_statement_t *statement)
4782 {
4783         /* create the header block */
4784         ir_node *header_block = new_immBlock();
4785
4786         /* the loop body */
4787         ir_node *body_block = new_immBlock();
4788         jump_if_reachable(body_block);
4789
4790         ir_node *old_continue_label = continue_label;
4791         ir_node *old_break_label    = break_label;
4792         continue_label              = header_block;
4793         break_label                 = NULL;
4794
4795         set_cur_block(body_block);
4796         statement_to_firm(statement->body);
4797         ir_node *const false_block = get_break_label();
4798
4799         assert(continue_label == header_block);
4800         continue_label = old_continue_label;
4801         break_label    = old_break_label;
4802
4803         jump_if_reachable(header_block);
4804
4805         /* create the condition */
4806         mature_immBlock(header_block);
4807         set_cur_block(header_block);
4808
4809         create_condition_evaluation(statement->condition, body_block, false_block);
4810         mature_immBlock(body_block);
4811         mature_immBlock(false_block);
4812
4813         set_cur_block(false_block);
4814 }
4815
4816 static void for_statement_to_firm(for_statement_t *statement)
4817 {
4818         /* create declarations */
4819         entity_t *entity = statement->scope.entities;
4820         for ( ; entity != NULL; entity = entity->base.next) {
4821                 if (!is_declaration(entity))
4822                         continue;
4823
4824                 create_local_declaration(entity);
4825         }
4826
4827         if (currently_reachable()) {
4828                 entity = statement->scope.entities;
4829                 for ( ; entity != NULL; entity = entity->base.next) {
4830                         if (!is_declaration(entity))
4831                                 continue;
4832
4833                         initialize_local_declaration(entity);
4834                 }
4835
4836                 if (statement->initialisation != NULL) {
4837                         expression_to_firm(statement->initialisation);
4838                 }
4839         }
4840
4841         /* Create the header block */
4842         ir_node *const header_block = new_immBlock();
4843         jump_if_reachable(header_block);
4844
4845         /* Create the condition. */
4846         ir_node *body_block;
4847         ir_node *false_block;
4848         if (statement->condition != NULL) {
4849                 body_block  = new_immBlock();
4850                 false_block = new_immBlock();
4851
4852                 set_cur_block(header_block);
4853                 create_condition_evaluation(statement->condition, body_block, false_block);
4854                 mature_immBlock(body_block);
4855         } else {
4856                 /* for-ever. */
4857                 body_block  = header_block;
4858                 false_block = NULL;
4859
4860                 keep_alive(header_block);
4861                 keep_all_memory(header_block);
4862         }
4863
4864         /* Create the step block, if necessary. */
4865         ir_node      *      step_block = header_block;
4866         expression_t *const step       = statement->step;
4867         if (step != NULL) {
4868                 step_block = new_immBlock();
4869         }
4870
4871         ir_node *const old_continue_label = continue_label;
4872         ir_node *const old_break_label    = break_label;
4873         continue_label = step_block;
4874         break_label    = false_block;
4875
4876         /* Create the loop body. */
4877         set_cur_block(body_block);
4878         statement_to_firm(statement->body);
4879         jump_if_reachable(step_block);
4880
4881         /* Create the step code. */
4882         if (step != NULL) {
4883                 mature_immBlock(step_block);
4884                 set_cur_block(step_block);
4885                 expression_to_firm(step);
4886                 jump_if_reachable(header_block);
4887         }
4888
4889         mature_immBlock(header_block);
4890         assert(false_block == NULL || false_block == break_label);
4891         false_block = break_label;
4892         if (false_block != NULL) {
4893                 mature_immBlock(false_block);
4894         }
4895         set_cur_block(false_block);
4896
4897         assert(continue_label == step_block);
4898         continue_label = old_continue_label;
4899         break_label    = old_break_label;
4900 }
4901
4902 static void create_jump_statement(const statement_t *statement,
4903                                   ir_node *target_block)
4904 {
4905         if (!currently_reachable())
4906                 return;
4907
4908         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
4909         ir_node  *jump = new_d_Jmp(dbgi);
4910         add_immBlock_pred(target_block, jump);
4911
4912         set_unreachable_now();
4913 }
4914
4915 static ir_switch_table *create_switch_table(const switch_statement_t *statement)
4916 {
4917         /* determine number of cases */
4918         size_t n_cases = 0;
4919         for (case_label_statement_t *l = statement->first_case; l != NULL;
4920              l = l->next) {
4921                 /* default case */
4922                 if (l->expression == NULL)
4923                         continue;
4924                 if (l->is_empty_range)
4925                         continue;
4926                 ++n_cases;
4927         }
4928
4929         ir_switch_table *res = ir_new_switch_table(current_ir_graph, n_cases);
4930         size_t           i   = 0;
4931         for (case_label_statement_t *l = statement->first_case; l != NULL;
4932              l = l->next) {
4933             if (l->expression == NULL) {
4934                         l->pn = pn_Switch_default;
4935                         continue;
4936                 }
4937                 if (l->is_empty_range)
4938                         continue;
4939                 ir_tarval *min = fold_constant_to_tarval(l->expression);
4940                 ir_tarval *max = min;
4941                 long       pn  = (long) i+1;
4942                 if (l->end_range != NULL)
4943                         max = fold_constant_to_tarval(l->end_range);
4944                 ir_switch_table_set(res, i++, min, max, pn);
4945                 l->pn = pn;
4946         }
4947         return res;
4948 }
4949
4950 static void switch_statement_to_firm(switch_statement_t *statement)
4951 {
4952         ir_node  *first_block = NULL;
4953         dbg_info *dbgi        = get_dbg_info(&statement->base.source_position);
4954         ir_node  *switch_node = NULL;
4955
4956         if (currently_reachable()) {
4957                 ir_node *expression = expression_to_firm(statement->expression);
4958                 ir_switch_table *table = create_switch_table(statement);
4959                 unsigned n_outs = (unsigned)ir_switch_table_get_n_entries(table) + 1;
4960
4961                 switch_node = new_d_Switch(dbgi, expression, n_outs, table);
4962                 first_block = get_cur_block();
4963         }
4964
4965         set_unreachable_now();
4966
4967         ir_node *const old_switch            = current_switch;
4968         ir_node *const old_break_label       = break_label;
4969         const bool     old_saw_default_label = saw_default_label;
4970         saw_default_label                    = false;
4971         current_switch                       = switch_node;
4972         break_label                          = NULL;
4973
4974         statement_to_firm(statement->body);
4975
4976         jump_if_reachable(get_break_label());
4977
4978         if (!saw_default_label && first_block != NULL) {
4979                 set_cur_block(first_block);
4980                 ir_node *proj = new_d_Proj(dbgi, switch_node, mode_X, pn_Switch_default);
4981                 add_immBlock_pred(get_break_label(), proj);
4982         }
4983
4984         if (break_label != NULL) {
4985                 mature_immBlock(break_label);
4986         }
4987         set_cur_block(break_label);
4988
4989         assert(current_switch == switch_node);
4990         current_switch    = old_switch;
4991         break_label       = old_break_label;
4992         saw_default_label = old_saw_default_label;
4993 }
4994
4995 static void case_label_to_firm(const case_label_statement_t *statement)
4996 {
4997         if (statement->is_empty_range)
4998                 return;
4999
5000         if (current_switch != NULL) {
5001                 ir_node *block = new_immBlock();
5002                 /* Fallthrough from previous case */
5003                 jump_if_reachable(block);
5004
5005                 ir_node  *const proj = new_Proj(current_switch, mode_X, statement->pn);
5006                 add_immBlock_pred(block, proj);
5007                 if (statement->expression == NULL)
5008                         saw_default_label = true;
5009
5010                 mature_immBlock(block);
5011                 set_cur_block(block);
5012         }
5013
5014         statement_to_firm(statement->statement);
5015 }
5016
5017 static void label_to_firm(const label_statement_t *statement)
5018 {
5019         ir_node *block = get_label_block(statement->label);
5020         jump_if_reachable(block);
5021
5022         set_cur_block(block);
5023         keep_alive(block);
5024         keep_all_memory(block);
5025
5026         statement_to_firm(statement->statement);
5027 }
5028
5029 static void goto_to_firm(const goto_statement_t *statement)
5030 {
5031         if (!currently_reachable())
5032                 return;
5033
5034         if (statement->expression) {
5035                 ir_node  *irn  = expression_to_firm(statement->expression);
5036                 dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
5037                 ir_node  *ijmp = new_d_IJmp(dbgi, irn);
5038
5039                 set_irn_link(ijmp, ijmp_list);
5040                 ijmp_list = ijmp;
5041         } else {
5042                 ir_node *block = get_label_block(statement->label);
5043                 ir_node *jmp   = new_Jmp();
5044                 add_immBlock_pred(block, jmp);
5045         }
5046         set_unreachable_now();
5047 }
5048
5049 static void asm_statement_to_firm(const asm_statement_t *statement)
5050 {
5051         bool needs_memory = false;
5052
5053         if (statement->is_volatile) {
5054                 needs_memory = true;
5055         }
5056
5057         size_t         n_clobbers = 0;
5058         asm_clobber_t *clobber    = statement->clobbers;
5059         for ( ; clobber != NULL; clobber = clobber->next) {
5060                 const char *clobber_str = clobber->clobber.begin;
5061
5062                 if (!be_is_valid_clobber(clobber_str)) {
5063                         errorf(&statement->base.source_position,
5064                                    "invalid clobber '%s' specified", clobber->clobber);
5065                         continue;
5066                 }
5067
5068                 if (streq(clobber_str, "memory")) {
5069                         needs_memory = true;
5070                         continue;
5071                 }
5072
5073                 ident *id = new_id_from_str(clobber_str);
5074                 obstack_ptr_grow(&asm_obst, id);
5075                 ++n_clobbers;
5076         }
5077         assert(obstack_object_size(&asm_obst) == n_clobbers * sizeof(ident*));
5078         ident **clobbers = NULL;
5079         if (n_clobbers > 0) {
5080                 clobbers = obstack_finish(&asm_obst);
5081         }
5082
5083         size_t n_inputs  = 0;
5084         asm_argument_t *argument = statement->inputs;
5085         for ( ; argument != NULL; argument = argument->next)
5086                 n_inputs++;
5087         size_t n_outputs = 0;
5088         argument = statement->outputs;
5089         for ( ; argument != NULL; argument = argument->next)
5090                 n_outputs++;
5091
5092         unsigned next_pos = 0;
5093
5094         ir_node *ins[n_inputs + n_outputs + 1];
5095         size_t   in_size = 0;
5096
5097         ir_asm_constraint tmp_in_constraints[n_outputs];
5098
5099         const expression_t *out_exprs[n_outputs];
5100         ir_node            *out_addrs[n_outputs];
5101         size_t              out_size = 0;
5102
5103         argument = statement->outputs;
5104         for ( ; argument != NULL; argument = argument->next) {
5105                 const char *constraints = argument->constraints.begin;
5106                 asm_constraint_flags_t asm_flags
5107                         = be_parse_asm_constraints(constraints);
5108
5109                 {
5110                         source_position_t const *const pos = &statement->base.source_position;
5111                         if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
5112                                 warningf(WARN_OTHER, pos, "some constraints in '%s' are not supported", constraints);
5113                         }
5114                         if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
5115                                 errorf(pos, "some constraints in '%s' are invalid", constraints);
5116                                 continue;
5117                         }
5118                         if (! (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE)) {
5119                                 errorf(pos, "no write flag specified for output constraints '%s'", constraints);
5120                                 continue;
5121                         }
5122                 }
5123
5124                 unsigned pos = next_pos++;
5125                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
5126                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
5127                         expression_t *expr = argument->expression;
5128                         ir_node      *addr = expression_to_addr(expr);
5129                         /* in+output, construct an artifical same_as constraint on the
5130                          * input */
5131                         if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_READ) {
5132                                 char     buf[64];
5133                                 ir_node *value = get_value_from_lvalue(expr, addr);
5134
5135                                 snprintf(buf, sizeof(buf), "%u", (unsigned) out_size);
5136
5137                                 ir_asm_constraint constraint;
5138                                 constraint.pos              = pos;
5139                                 constraint.constraint       = new_id_from_str(buf);
5140                                 constraint.mode             = get_ir_mode_storage(expr->base.type);
5141                                 tmp_in_constraints[in_size] = constraint;
5142                                 ins[in_size] = value;
5143
5144                                 ++in_size;
5145                         }
5146
5147                         out_exprs[out_size] = expr;
5148                         out_addrs[out_size] = addr;
5149                         ++out_size;
5150                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
5151                         /* pure memory ops need no input (but we have to make sure we
5152                          * attach to the memory) */
5153                         assert(! (asm_flags &
5154                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
5155                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
5156                         needs_memory = true;
5157
5158                         /* we need to attach the address to the inputs */
5159                         expression_t *expr = argument->expression;
5160
5161                         ir_asm_constraint constraint;
5162                         constraint.pos              = pos;
5163                         constraint.constraint       = new_id_from_str(constraints);
5164                         constraint.mode             = NULL;
5165                         tmp_in_constraints[in_size] = constraint;
5166
5167                         ins[in_size]          = expression_to_addr(expr);
5168                         ++in_size;
5169                         continue;
5170                 } else {
5171                         errorf(&statement->base.source_position,
5172                                "only modifiers but no place set in constraints '%s'",
5173                                constraints);
5174                         continue;
5175                 }
5176
5177                 ir_asm_constraint constraint;
5178                 constraint.pos        = pos;
5179                 constraint.constraint = new_id_from_str(constraints);
5180                 constraint.mode       = get_ir_mode_storage(argument->expression->base.type);
5181
5182                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5183         }
5184         assert(obstack_object_size(&asm_obst)
5185                         == out_size * sizeof(ir_asm_constraint));
5186         ir_asm_constraint *output_constraints = obstack_finish(&asm_obst);
5187
5188
5189         obstack_grow(&asm_obst, tmp_in_constraints,
5190                      in_size * sizeof(tmp_in_constraints[0]));
5191         /* find and count input and output arguments */
5192         argument = statement->inputs;
5193         for ( ; argument != NULL; argument = argument->next) {
5194                 const char *constraints = argument->constraints.begin;
5195                 asm_constraint_flags_t asm_flags
5196                         = be_parse_asm_constraints(constraints);
5197
5198                 if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
5199                         errorf(&statement->base.source_position,
5200                                "some constraints in '%s' are not supported", constraints);
5201                         continue;
5202                 }
5203                 if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
5204                         errorf(&statement->base.source_position,
5205                                "some constraints in '%s' are invalid", constraints);
5206                         continue;
5207                 }
5208                 if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE) {
5209                         errorf(&statement->base.source_position,
5210                                "write flag specified for input constraints '%s'",
5211                                constraints);
5212                         continue;
5213                 }
5214
5215                 ir_node *input;
5216                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
5217                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
5218                         /* we can treat this as "normal" input */
5219                         input = expression_to_firm(argument->expression);
5220                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
5221                         /* pure memory ops need no input (but we have to make sure we
5222                          * attach to the memory) */
5223                         assert(! (asm_flags &
5224                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
5225                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
5226                         needs_memory = true;
5227                         input = expression_to_addr(argument->expression);
5228                 } else {
5229                         errorf(&statement->base.source_position,
5230                                "only modifiers but no place set in constraints '%s'",
5231                                constraints);
5232                         continue;
5233                 }
5234
5235                 ir_asm_constraint constraint;
5236                 constraint.pos        = next_pos++;
5237                 constraint.constraint = new_id_from_str(constraints);
5238                 constraint.mode       = get_irn_mode(input);
5239
5240                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5241                 ins[in_size++] = input;
5242         }
5243
5244         if (needs_memory) {
5245                 ir_asm_constraint constraint;
5246                 constraint.pos        = next_pos++;
5247                 constraint.constraint = new_id_from_str("");
5248                 constraint.mode       = mode_M;
5249
5250                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5251                 ins[in_size++] = get_store();
5252         }
5253
5254         assert(obstack_object_size(&asm_obst)
5255                         == in_size * sizeof(ir_asm_constraint));
5256         ir_asm_constraint *input_constraints = obstack_finish(&asm_obst);
5257
5258         /* create asm node */
5259         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
5260
5261         ident *asm_text = new_id_from_str(statement->asm_text.begin);
5262
5263         ir_node *node = new_d_ASM(dbgi, in_size, ins, input_constraints,
5264                                   out_size, output_constraints,
5265                                   n_clobbers, clobbers, asm_text);
5266
5267         if (statement->is_volatile) {
5268                 set_irn_pinned(node, op_pin_state_pinned);
5269         } else {
5270                 set_irn_pinned(node, op_pin_state_floats);
5271         }
5272
5273         /* create output projs & connect them */
5274         if (needs_memory) {
5275                 ir_node *projm = new_Proj(node, mode_M, out_size);
5276                 set_store(projm);
5277         }
5278
5279         size_t i;
5280         for (i = 0; i < out_size; ++i) {
5281                 const expression_t *out_expr = out_exprs[i];
5282                 long                pn       = i;
5283                 ir_mode            *mode     = get_ir_mode_storage(out_expr->base.type);
5284                 ir_node            *proj     = new_Proj(node, mode, pn);
5285                 ir_node            *addr     = out_addrs[i];
5286
5287                 set_value_for_expression_addr(out_expr, proj, addr);
5288         }
5289 }
5290
5291 static void ms_try_statement_to_firm(ms_try_statement_t *statement)
5292 {
5293         statement_to_firm(statement->try_statement);
5294         source_position_t const *const pos = &statement->base.source_position;
5295         warningf(WARN_OTHER, pos, "structured exception handling ignored");
5296 }
5297
5298 static void leave_statement_to_firm(leave_statement_t *statement)
5299 {
5300         errorf(&statement->base.source_position, "__leave not supported yet");
5301 }
5302
5303 /**
5304  * Transform a statement.
5305  */
5306 static void statement_to_firm(statement_t *statement)
5307 {
5308 #ifndef NDEBUG
5309         assert(!statement->base.transformed);
5310         statement->base.transformed = true;
5311 #endif
5312
5313         switch (statement->kind) {
5314         case STATEMENT_ERROR:
5315                 panic("error statement found");
5316         case STATEMENT_EMPTY:
5317                 /* nothing */
5318                 return;
5319         case STATEMENT_COMPOUND:
5320                 compound_statement_to_firm(&statement->compound);
5321                 return;
5322         case STATEMENT_RETURN:
5323                 return_statement_to_firm(&statement->returns);
5324                 return;
5325         case STATEMENT_EXPRESSION:
5326                 expression_statement_to_firm(&statement->expression);
5327                 return;
5328         case STATEMENT_IF:
5329                 if_statement_to_firm(&statement->ifs);
5330                 return;
5331         case STATEMENT_WHILE:
5332                 while_statement_to_firm(&statement->whiles);
5333                 return;
5334         case STATEMENT_DO_WHILE:
5335                 do_while_statement_to_firm(&statement->do_while);
5336                 return;
5337         case STATEMENT_DECLARATION:
5338                 declaration_statement_to_firm(&statement->declaration);
5339                 return;
5340         case STATEMENT_BREAK:
5341                 create_jump_statement(statement, get_break_label());
5342                 return;
5343         case STATEMENT_CONTINUE:
5344                 create_jump_statement(statement, continue_label);
5345                 return;
5346         case STATEMENT_SWITCH:
5347                 switch_statement_to_firm(&statement->switchs);
5348                 return;
5349         case STATEMENT_CASE_LABEL:
5350                 case_label_to_firm(&statement->case_label);
5351                 return;
5352         case STATEMENT_FOR:
5353                 for_statement_to_firm(&statement->fors);
5354                 return;
5355         case STATEMENT_LABEL:
5356                 label_to_firm(&statement->label);
5357                 return;
5358         case STATEMENT_GOTO:
5359                 goto_to_firm(&statement->gotos);
5360                 return;
5361         case STATEMENT_ASM:
5362                 asm_statement_to_firm(&statement->asms);
5363                 return;
5364         case STATEMENT_MS_TRY:
5365                 ms_try_statement_to_firm(&statement->ms_try);
5366                 return;
5367         case STATEMENT_LEAVE:
5368                 leave_statement_to_firm(&statement->leave);
5369                 return;
5370         }
5371         panic("statement not implemented");
5372 }
5373
5374 static int count_local_variables(const entity_t *entity,
5375                                  const entity_t *const last)
5376 {
5377         int count = 0;
5378         entity_t const *const end = last != NULL ? last->base.next : NULL;
5379         for (; entity != end; entity = entity->base.next) {
5380                 type_t *type;
5381                 bool    address_taken;
5382
5383                 if (entity->kind == ENTITY_VARIABLE) {
5384                         type          = skip_typeref(entity->declaration.type);
5385                         address_taken = entity->variable.address_taken;
5386                 } else if (entity->kind == ENTITY_PARAMETER) {
5387                         type          = skip_typeref(entity->declaration.type);
5388                         address_taken = entity->parameter.address_taken;
5389                 } else {
5390                         continue;
5391                 }
5392
5393                 if (!address_taken && is_type_scalar(type))
5394                         ++count;
5395         }
5396         return count;
5397 }
5398
5399 static void count_local_variables_in_stmt(statement_t *stmt, void *const env)
5400 {
5401         int *const count = env;
5402
5403         switch (stmt->kind) {
5404         case STATEMENT_DECLARATION: {
5405                 const declaration_statement_t *const decl_stmt = &stmt->declaration;
5406                 *count += count_local_variables(decl_stmt->declarations_begin,
5407                                 decl_stmt->declarations_end);
5408                 break;
5409         }
5410
5411         case STATEMENT_FOR:
5412                 *count += count_local_variables(stmt->fors.scope.entities, NULL);
5413                 break;
5414
5415         default:
5416                 break;
5417         }
5418 }
5419
5420 /**
5421  * Return the number of local (alias free) variables used by a function.
5422  */
5423 static int get_function_n_local_vars(entity_t *entity)
5424 {
5425         const function_t *function = &entity->function;
5426         int count = 0;
5427
5428         /* count parameters */
5429         count += count_local_variables(function->parameters.entities, NULL);
5430
5431         /* count local variables declared in body */
5432         walk_statements(function->statement, count_local_variables_in_stmt, &count);
5433         return count;
5434 }
5435
5436 /**
5437  * Build Firm code for the parameters of a function.
5438  */
5439 static void initialize_function_parameters(entity_t *entity)
5440 {
5441         assert(entity->kind == ENTITY_FUNCTION);
5442         ir_graph *irg             = current_ir_graph;
5443         ir_node  *args            = get_irg_args(irg);
5444         int       n               = 0;
5445         ir_type  *function_irtype;
5446
5447         if (entity->function.need_closure) {
5448                 /* add an extra parameter for the static link */
5449                 entity->function.static_link = new_r_Proj(args, mode_P_data, 0);
5450                 ++n;
5451
5452                 /* Matze: IMO this is wrong, nested functions should have an own
5453                  * type and not rely on strange parameters... */
5454                 function_irtype = create_method_type(&entity->declaration.type->function, true);
5455         } else {
5456                 function_irtype = get_ir_type(entity->declaration.type);
5457         }
5458
5459
5460
5461         entity_t *parameter = entity->function.parameters.entities;
5462         for ( ; parameter != NULL; parameter = parameter->base.next, ++n) {
5463                 if (parameter->kind != ENTITY_PARAMETER)
5464                         continue;
5465
5466                 assert(parameter->declaration.kind == DECLARATION_KIND_UNKNOWN);
5467                 type_t *type = skip_typeref(parameter->declaration.type);
5468
5469                 bool needs_entity = parameter->parameter.address_taken;
5470                 assert(!is_type_array(type));
5471                 if (is_type_compound(type)) {
5472                         needs_entity = true;
5473                 }
5474
5475                 ir_type *param_irtype = get_method_param_type(function_irtype, n);
5476                 if (needs_entity) {
5477                         ir_type   *frame_type = get_irg_frame_type(irg);
5478                         ir_entity *param
5479                                 = new_parameter_entity(frame_type, n, param_irtype);
5480                         parameter->declaration.kind
5481                                 = DECLARATION_KIND_PARAMETER_ENTITY;
5482                         parameter->parameter.v.entity = param;
5483                         continue;
5484                 }
5485
5486                 ir_mode *param_mode = get_type_mode(param_irtype);
5487                 long     pn         = n;
5488                 ir_node *value      = new_r_Proj(args, param_mode, pn);
5489
5490                 ir_mode *mode = get_ir_mode_storage(type);
5491                 value = create_conv(NULL, value, mode);
5492                 value = do_strict_conv(NULL, value);
5493
5494                 parameter->declaration.kind         = DECLARATION_KIND_PARAMETER;
5495                 parameter->parameter.v.value_number = next_value_number_function;
5496                 set_irg_loc_description(current_ir_graph, next_value_number_function,
5497                                         parameter);
5498                 ++next_value_number_function;
5499
5500                 set_value(parameter->parameter.v.value_number, value);
5501         }
5502 }
5503
5504 /**
5505  * Handle additional decl modifiers for IR-graphs
5506  *
5507  * @param irg            the IR-graph
5508  * @param dec_modifiers  additional modifiers
5509  */
5510 static void handle_decl_modifier_irg(ir_graph_ptr irg,
5511                                      decl_modifiers_t decl_modifiers)
5512 {
5513         if (decl_modifiers & DM_NAKED) {
5514                 /* TRUE if the declaration includes the Microsoft
5515                    __declspec(naked) specifier. */
5516                 add_irg_additional_properties(irg, mtp_property_naked);
5517         }
5518         if (decl_modifiers & DM_FORCEINLINE) {
5519                 /* TRUE if the declaration includes the
5520                    Microsoft __forceinline specifier. */
5521                 set_irg_inline_property(irg, irg_inline_forced);
5522         }
5523         if (decl_modifiers & DM_NOINLINE) {
5524                 /* TRUE if the declaration includes the Microsoft
5525                    __declspec(noinline) specifier. */
5526                 set_irg_inline_property(irg, irg_inline_forbidden);
5527         }
5528 }
5529
5530 static void add_function_pointer(ir_type *segment, ir_entity *method,
5531                                  const char *unique_template)
5532 {
5533         ir_type   *method_type  = get_entity_type(method);
5534         ir_type   *ptr_type     = new_type_pointer(method_type);
5535
5536         /* these entities don't really have a name but firm only allows
5537          * "" in ld_ident.
5538          * Note that we mustn't give these entities a name since for example
5539          * Mach-O doesn't allow them. */
5540         ident     *ide          = id_unique(unique_template);
5541         ir_entity *ptr          = new_entity(segment, ide, ptr_type);
5542         ir_graph  *irg          = get_const_code_irg();
5543         ir_node   *val          = new_rd_SymConst_addr_ent(NULL, irg, mode_P_code,
5544                                                            method);
5545
5546         set_entity_ld_ident(ptr, new_id_from_chars("", 0));
5547         set_entity_compiler_generated(ptr, 1);
5548         set_entity_visibility(ptr, ir_visibility_private);
5549         add_entity_linkage(ptr, IR_LINKAGE_CONSTANT|IR_LINKAGE_HIDDEN_USER);
5550         set_atomic_ent_value(ptr, val);
5551 }
5552
5553 /**
5554  * Generate possible IJmp branches to a given label block.
5555  */
5556 static void gen_ijmp_branches(ir_node *block)
5557 {
5558         ir_node *ijmp;
5559         for (ijmp = ijmp_list; ijmp != NULL; ijmp = get_irn_link(ijmp)) {
5560                 add_immBlock_pred(block, ijmp);
5561         }
5562 }
5563
5564 /**
5565  * Create code for a function and all inner functions.
5566  *
5567  * @param entity  the function entity
5568  */
5569 static void create_function(entity_t *entity)
5570 {
5571         assert(entity->kind == ENTITY_FUNCTION);
5572         ir_entity *function_entity = get_function_entity(entity, current_outer_frame);
5573
5574         if (entity->function.statement == NULL)
5575                 return;
5576
5577         inner_functions     = NULL;
5578         current_trampolines = NULL;
5579
5580         if (entity->declaration.modifiers & DM_CONSTRUCTOR) {
5581                 ir_type *segment = get_segment_type(IR_SEGMENT_CONSTRUCTORS);
5582                 add_function_pointer(segment, function_entity, "constructor_ptr.%u");
5583         }
5584         if (entity->declaration.modifiers & DM_DESTRUCTOR) {
5585                 ir_type *segment = get_segment_type(IR_SEGMENT_DESTRUCTORS);
5586                 add_function_pointer(segment, function_entity, "destructor_ptr.%u");
5587         }
5588
5589         current_function_entity = entity;
5590         current_function_name   = NULL;
5591         current_funcsig         = NULL;
5592
5593         assert(all_labels == NULL);
5594         all_labels = NEW_ARR_F(label_t *, 0);
5595         ijmp_list  = NULL;
5596
5597         int       n_local_vars = get_function_n_local_vars(entity);
5598         ir_graph *irg          = new_ir_graph(function_entity, n_local_vars);
5599         current_ir_graph = irg;
5600
5601         ir_graph *old_current_function = current_function;
5602         current_function = irg;
5603
5604         ir_entity *const old_current_vararg_entity = current_vararg_entity;
5605         current_vararg_entity = NULL;
5606
5607         set_irg_fp_model(irg, firm_fp_model);
5608         tarval_enable_fp_ops(1);
5609         set_irn_dbg_info(get_irg_start_block(irg),
5610                          get_entity_dbg_info(function_entity));
5611
5612         ir_node *first_block = get_cur_block();
5613
5614         /* set inline flags */
5615         if (entity->function.is_inline)
5616                 set_irg_inline_property(irg, irg_inline_recomended);
5617         handle_decl_modifier_irg(irg, entity->declaration.modifiers);
5618
5619         next_value_number_function = 0;
5620         initialize_function_parameters(entity);
5621         current_static_link = entity->function.static_link;
5622
5623         statement_to_firm(entity->function.statement);
5624
5625         ir_node *end_block = get_irg_end_block(irg);
5626
5627         /* do we have a return statement yet? */
5628         if (currently_reachable()) {
5629                 type_t *type = skip_typeref(entity->declaration.type);
5630                 assert(is_type_function(type));
5631                 const function_type_t *func_type   = &type->function;
5632                 const type_t          *return_type
5633                         = skip_typeref(func_type->return_type);
5634
5635                 ir_node *ret;
5636                 if (is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
5637                         ret = new_Return(get_store(), 0, NULL);
5638                 } else {
5639                         ir_mode *mode;
5640                         if (is_type_scalar(return_type)) {
5641                                 mode = get_ir_mode_storage(func_type->return_type);
5642                         } else {
5643                                 mode = mode_P_data;
5644                         }
5645
5646                         ir_node *in[1];
5647                         /* §5.1.2.2.3 main implicitly returns 0 */
5648                         if (is_main(entity)) {
5649                                 in[0] = new_Const(get_mode_null(mode));
5650                         } else {
5651                                 in[0] = new_Unknown(mode);
5652                         }
5653                         ret = new_Return(get_store(), 1, in);
5654                 }
5655                 add_immBlock_pred(end_block, ret);
5656         }
5657
5658         bool has_computed_gotos = false;
5659         for (int i = ARR_LEN(all_labels) - 1; i >= 0; --i) {
5660                 label_t *label = all_labels[i];
5661                 if (label->address_taken) {
5662                         gen_ijmp_branches(label->block);
5663                         has_computed_gotos = true;
5664                 }
5665                 mature_immBlock(label->block);
5666         }
5667         if (has_computed_gotos) {
5668                 /* if we have computed goto's in the function, we cannot inline it */
5669                 if (get_irg_inline_property(irg) >= irg_inline_recomended) {
5670                         source_position_t const *const pos = &entity->base.source_position;
5671                         warningf(WARN_OTHER, pos, "'%N' can never be inlined because it contains a computed goto", entity);
5672                 }
5673                 set_irg_inline_property(irg, irg_inline_forbidden);
5674         }
5675
5676         DEL_ARR_F(all_labels);
5677         all_labels = NULL;
5678
5679         mature_immBlock(first_block);
5680         mature_immBlock(end_block);
5681
5682         irg_finalize_cons(irg);
5683
5684         /* finalize the frame type */
5685         ir_type *frame_type = get_irg_frame_type(irg);
5686         int      n          = get_compound_n_members(frame_type);
5687         int      align_all  = 4;
5688         int      offset     = 0;
5689         for (int i = 0; i < n; ++i) {
5690                 ir_entity *member      = get_compound_member(frame_type, i);
5691                 ir_type   *entity_type = get_entity_type(member);
5692
5693                 int align = get_type_alignment_bytes(entity_type);
5694                 if (align > align_all)
5695                         align_all = align;
5696                 int misalign = 0;
5697                 if (align > 0) {
5698                         misalign  = offset % align;
5699                         if (misalign > 0) {
5700                                 offset += align - misalign;
5701                         }
5702                 }
5703
5704                 set_entity_offset(member, offset);
5705                 offset += get_type_size_bytes(entity_type);
5706         }
5707         set_type_size_bytes(frame_type, offset);
5708         set_type_alignment_bytes(frame_type, align_all);
5709
5710         irg_verify(irg, VERIFY_ENFORCE_SSA);
5711         current_vararg_entity = old_current_vararg_entity;
5712         current_function      = old_current_function;
5713
5714         if (current_trampolines != NULL) {
5715                 DEL_ARR_F(current_trampolines);
5716                 current_trampolines = NULL;
5717         }
5718
5719         /* create inner functions if any */
5720         entity_t **inner = inner_functions;
5721         if (inner != NULL) {
5722                 ir_type *rem_outer_frame      = current_outer_frame;
5723                 current_outer_frame           = get_irg_frame_type(current_ir_graph);
5724                 for (int i = ARR_LEN(inner) - 1; i >= 0; --i) {
5725                         create_function(inner[i]);
5726                 }
5727                 DEL_ARR_F(inner);
5728
5729                 current_outer_frame      = rem_outer_frame;
5730         }
5731 }
5732
5733 static void scope_to_firm(scope_t *scope)
5734 {
5735         /* first pass: create declarations */
5736         entity_t *entity = scope->entities;
5737         for ( ; entity != NULL; entity = entity->base.next) {
5738                 if (entity->base.symbol == NULL)
5739                         continue;
5740
5741                 if (entity->kind == ENTITY_FUNCTION) {
5742                         if (entity->function.btk != BUILTIN_NONE) {
5743                                 /* builtins have no representation */
5744                                 continue;
5745                         }
5746                         (void)get_function_entity(entity, NULL);
5747                 } else if (entity->kind == ENTITY_VARIABLE) {
5748                         create_global_variable(entity);
5749                 } else if (entity->kind == ENTITY_NAMESPACE) {
5750                         scope_to_firm(&entity->namespacee.members);
5751                 }
5752         }
5753
5754         /* second pass: create code/initializers */
5755         entity = scope->entities;
5756         for ( ; entity != NULL; entity = entity->base.next) {
5757                 if (entity->base.symbol == NULL)
5758                         continue;
5759
5760                 if (entity->kind == ENTITY_FUNCTION) {
5761                         if (entity->function.btk != BUILTIN_NONE) {
5762                                 /* builtins have no representation */
5763                                 continue;
5764                         }
5765                         create_function(entity);
5766                 } else if (entity->kind == ENTITY_VARIABLE) {
5767                         assert(entity->declaration.kind
5768                                         == DECLARATION_KIND_GLOBAL_VARIABLE);
5769                         current_ir_graph = get_const_code_irg();
5770                         create_variable_initializer(entity);
5771                 }
5772         }
5773 }
5774
5775 void init_ast2firm(void)
5776 {
5777         obstack_init(&asm_obst);
5778         init_atomic_modes();
5779
5780         ir_set_debug_retrieve(dbg_retrieve);
5781         ir_set_type_debug_retrieve(dbg_print_type_dbg_info);
5782
5783         /* create idents for all known runtime functions */
5784         for (size_t i = 0; i < lengthof(rts_data); ++i) {
5785                 rts_idents[i] = new_id_from_str(rts_data[i].name);
5786         }
5787
5788         entitymap_init(&entitymap);
5789 }
5790
5791 static void init_ir_types(void)
5792 {
5793         static int ir_types_initialized = 0;
5794         if (ir_types_initialized)
5795                 return;
5796         ir_types_initialized = 1;
5797
5798         ir_type_int        = get_ir_type(type_int);
5799         ir_type_char       = get_ir_type(type_char);
5800         ir_type_const_char = get_ir_type(type_const_char);
5801         ir_type_wchar_t    = get_ir_type(type_wchar_t);
5802         ir_type_void       = get_ir_type(type_void);
5803
5804         be_params             = be_get_backend_param();
5805         mode_float_arithmetic = be_params->mode_float_arithmetic;
5806
5807         stack_param_align     = be_params->stack_param_align;
5808 }
5809
5810 void exit_ast2firm(void)
5811 {
5812         entitymap_destroy(&entitymap);
5813         obstack_free(&asm_obst, NULL);
5814 }
5815
5816 static void global_asm_to_firm(statement_t *s)
5817 {
5818         for (; s != NULL; s = s->base.next) {
5819                 assert(s->kind == STATEMENT_ASM);
5820
5821                 char const *const text = s->asms.asm_text.begin;
5822                 size_t            size = s->asms.asm_text.size;
5823
5824                 /* skip the last \0 */
5825                 if (text[size - 1] == '\0')
5826                         --size;
5827
5828                 ident *const id = new_id_from_chars(text, size);
5829                 add_irp_asm(id);
5830         }
5831 }
5832
5833 void translation_unit_to_firm(translation_unit_t *unit)
5834 {
5835         /* initialize firm arithmetic */
5836         tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
5837         ir_set_uninitialized_local_variable_func(uninitialized_local_var);
5838
5839         /* just to be sure */
5840         continue_label           = NULL;
5841         break_label              = NULL;
5842         current_switch           = NULL;
5843         current_translation_unit = unit;
5844
5845         init_ir_types();
5846
5847         scope_to_firm(&unit->scope);
5848         global_asm_to_firm(unit->global_asm);
5849
5850         current_ir_graph         = NULL;
5851         current_translation_unit = NULL;
5852 }