nsz Git - cparser/blob - ast2firm.c

   1 /*
   2  * This file is part of cparser.
   3  * Copyright (C) 2007-2009 Matthias Braun <matze@braunis.de>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  18  * 02111-1307, USA.
  19  */
  20 #include <config.h>
  21
  22 #include <assert.h>
  23 #include <string.h>
  24 #include <stdbool.h>
  25 #include <unistd.h>
  26 #include <limits.h>
  27
  28 #include <libfirm/firm.h>
  29 #include <libfirm/adt/obst.h>
  30 #include <libfirm/be.h>
  31
  32 #include "ast2firm.h"
  33
  34 #include "adt/error.h"
  35 #include "adt/array.h"
  36 #include "adt/strutil.h"
  37 #include "adt/util.h"
  38 #include "jump_target.h"
  39 #include "symbol_t.h"
  40 #include "token_t.h"
  41 #include "type_t.h"
  42 #include "ast_t.h"
  43 #include "entity_t.h"
  44 #include "parser.h"
  45 #include "diagnostic.h"
  46 #include "lang_features.h"
  47 #include "types.h"
  48 #include "type_hash.h"
  49 #include "mangle.h"
  50 #include "walk.h"
  51 #include "warning.h"
  52 #include "printer.h"
  53 #include "entitymap_t.h"
  54 #include "driver/firm_opt.h"
  55
  56 typedef struct trampoline_region trampoline_region;
  57 struct trampoline_region {
  58         ir_entity        *function;    /**< The function that is called by this trampoline */
  59         ir_entity        *region;      /**< created region for the trampoline */
  60 };
  61
  62 fp_model_t firm_fp_model = fp_model_precise;
  63
  64 static const backend_params *be_params;
  65
  66 static ir_type *ir_type_char;
  67
  68 /* architecture specific floating point arithmetic mode (if any) */
  69 static ir_mode *mode_float_arithmetic;
  70
  71 /* alignment of stack parameters */
  72 static unsigned stack_param_align;
  73
  74 static int         next_value_number_function;
  75 static jump_target continue_target;
  76 static jump_target break_target;
  77 static ir_node    *current_switch;
  78 static bool        saw_default_label;
  79 static entity_t  **inner_functions;
  80 static jump_target ijmp_target;
  81 static ir_node   **ijmp_ops;
  82 static ir_node   **ijmp_blocks;
  83 static bool        constant_folding;
  84
  85 #define PUSH_BREAK(val) \
  86         jump_target const old_break_target = break_target; \
  87         (init_jump_target(&break_target, (val)))
  88 #define POP_BREAK() \
  89         ((void)(break_target = old_break_target))
  90
  91 #define PUSH_CONTINUE(val) \
  92         jump_target const old_continue_target = continue_target; \
  93         (init_jump_target(&continue_target, (val)))
  94 #define POP_CONTINUE() \
  95         ((void)(continue_target = old_continue_target))
  96
  97 #define PUSH_IRG(val) \
  98         ir_graph *const old_irg = current_ir_graph; \
  99         ir_graph *const new_irg = (val); \
 100         ((void)(current_ir_graph = new_irg))
 101
 102 #define POP_IRG() \
 103         (assert(current_ir_graph == new_irg), (void)(current_ir_graph = old_irg))
 104
 105 static const entity_t     *current_function_entity;
 106 static ir_node            *current_function_name;
 107 static ir_node            *current_funcsig;
 108 static ir_graph           *current_function;
 109 static translation_unit_t *current_translation_unit;
 110 static trampoline_region  *current_trampolines;
 111 static ir_type            *current_outer_frame;
 112 static ir_node            *current_static_link;
 113 static ir_entity          *current_vararg_entity;
 114
 115 static entitymap_t  entitymap;
 116
 117 static struct obstack asm_obst;
 118
 119 typedef enum declaration_kind_t {
 120         DECLARATION_KIND_UNKNOWN,
 121         DECLARATION_KIND_VARIABLE_LENGTH_ARRAY,
 122         DECLARATION_KIND_GLOBAL_VARIABLE,
 123         DECLARATION_KIND_LOCAL_VARIABLE,
 124         DECLARATION_KIND_LOCAL_VARIABLE_ENTITY,
 125         DECLARATION_KIND_PARAMETER,
 126         DECLARATION_KIND_PARAMETER_ENTITY,
 127         DECLARATION_KIND_FUNCTION,
 128         DECLARATION_KIND_COMPOUND_MEMBER,
 129         DECLARATION_KIND_INNER_FUNCTION
 130 } declaration_kind_t;
 131
 132 static ir_type *get_ir_type_incomplete(type_t *type);
 133
 134 static void enqueue_inner_function(entity_t *entity)
 135 {
 136         if (inner_functions == NULL)
 137                 inner_functions = NEW_ARR_F(entity_t *, 0);
 138         ARR_APP1(entity_t*, inner_functions, entity);
 139 }
 140
 141 static ir_node *uninitialized_local_var(ir_graph *irg, ir_mode *mode, int pos)
 142 {
 143         const entity_t *entity = get_irg_loc_description(irg, pos);
 144
 145         if (entity != NULL) {
 146                 source_position_t const *const pos = &entity->base.source_position;
 147                 warningf(WARN_UNINITIALIZED, pos, "'%N' might be used uninitialized", entity);
 148         }
 149         return new_r_Unknown(irg, mode);
 150 }
 151
 152 static src_loc_t dbg_retrieve(const dbg_info *dbg)
 153 {
 154         source_position_t const *const pos = (source_position_t const*)dbg;
 155         if (pos) {
 156                 return (src_loc_t){ pos->input_name, pos->lineno, pos->colno };
 157         } else {
 158                 return (src_loc_t){ NULL, 0, 0 };
 159         }
 160 }
 161
 162 static dbg_info *get_dbg_info(const source_position_t *pos)
 163 {
 164         return (dbg_info*) pos;
 165 }
 166
 167 static void dbg_print_type_dbg_info(char *buffer, size_t buffer_size,
 168                                     const type_dbg_info *dbg)
 169 {
 170         assert(dbg != NULL);
 171         print_to_buffer(buffer, buffer_size);
 172         const type_t *type = (const type_t*) dbg;
 173         print_type(type);
 174         finish_print_to_buffer();
 175 }
 176
 177 static type_dbg_info *get_type_dbg_info_(const type_t *type)
 178 {
 179         return (type_dbg_info*) type;
 180 }
 181
 182 /* is the current block a reachable one? */
 183 static bool currently_reachable(void)
 184 {
 185         ir_node *const block = get_cur_block();
 186         return block != NULL && !is_Bad(block);
 187 }
 188
 189 static void set_unreachable_now(void)
 190 {
 191         set_cur_block(NULL);
 192 }
 193
 194 ir_mode *atomic_modes[ATOMIC_TYPE_LAST+1];
 195
 196 static ir_node *_expression_to_firm(const expression_t *expression);
 197 static ir_node *expression_to_firm(const expression_t *expression);
 198
 199 static unsigned decide_modulo_shift(unsigned type_size)
 200 {
 201         if (architecture_modulo_shift == 0)
 202                 return 0;
 203         if (type_size < architecture_modulo_shift)
 204                 return architecture_modulo_shift;
 205         return type_size;
 206 }
 207
 208 static ir_mode *init_atomic_ir_mode(atomic_type_kind_t kind)
 209 {
 210         unsigned flags = get_atomic_type_flags(kind);
 211         unsigned size  = get_atomic_type_size(kind);
 212         if ((flags & ATOMIC_TYPE_FLAG_FLOAT)
 213             && !(flags & ATOMIC_TYPE_FLAG_COMPLEX)) {
 214                 switch (size) {
 215                 case 4:  return get_modeF();
 216                 case 8:  return get_modeD();
 217                 default: panic("unexpected kind");
 218                 }
 219         } else if (flags & ATOMIC_TYPE_FLAG_INTEGER) {
 220                 char            name[64];
 221                 unsigned        bit_size     = size * 8;
 222                 bool            is_signed    = (flags & ATOMIC_TYPE_FLAG_SIGNED) != 0;
 223                 unsigned        modulo_shift = decide_modulo_shift(bit_size);
 224
 225                 snprintf(name, sizeof(name), "%s%u", is_signed ? "I" : "U", bit_size);
 226                 return new_int_mode(name, irma_twos_complement, bit_size, is_signed,
 227                                     modulo_shift);
 228         }
 229
 230         return NULL;
 231 }
 232
 233 /**
 234  * Initialises the atomic modes depending on the machine size.
 235  */
 236 static void init_atomic_modes(void)
 237 {
 238         atomic_modes[ATOMIC_TYPE_VOID] = mode_ANY;
 239         for (int i = 0; i <= ATOMIC_TYPE_LAST; ++i) {
 240                 if (atomic_modes[i] != NULL)
 241                         continue;
 242                 atomic_modes[i] = init_atomic_ir_mode((atomic_type_kind_t) i);
 243         }
 244 }
 245
 246 ir_mode *get_atomic_mode(atomic_type_kind_t kind)
 247 {
 248         assert(kind <= ATOMIC_TYPE_LAST);
 249         return atomic_modes[kind];
 250 }
 251
 252 static ir_node *get_vla_size(array_type_t *const type)
 253 {
 254         ir_node *size_node = type->size_node;
 255         if (size_node == NULL) {
 256                 size_node = expression_to_firm(type->size_expression);
 257                 type->size_node = size_node;
 258         }
 259         return size_node;
 260 }
 261
 262 static unsigned count_parameters(const function_type_t *function_type)
 263 {
 264         unsigned count = 0;
 265
 266         function_parameter_t *parameter = function_type->parameters;
 267         for ( ; parameter != NULL; parameter = parameter->next) {
 268                 ++count;
 269         }
 270
 271         return count;
 272 }
 273
 274 /**
 275  * Creates a Firm type for an atomic type
 276  */
 277 static ir_type *create_atomic_type(atomic_type_kind_t akind, const type_t *type)
 278 {
 279         ir_mode        *mode      = atomic_modes[akind];
 280         type_dbg_info  *dbgi      = get_type_dbg_info_(type);
 281         ir_type        *irtype    = new_d_type_primitive(mode, dbgi);
 282         il_alignment_t  alignment = get_atomic_type_alignment(akind);
 283
 284         set_type_size_bytes(irtype, get_atomic_type_size(akind));
 285         set_type_alignment_bytes(irtype, alignment);
 286
 287         return irtype;
 288 }
 289
 290 /**
 291  * Creates a Firm type for a complex type
 292  */
 293 static ir_type *create_complex_type(const atomic_type_t *type)
 294 {
 295         atomic_type_kind_t  kind = type->akind;
 296         ir_mode            *mode = atomic_modes[kind];
 297         ident              *id   = get_mode_ident(mode);
 298
 299         (void) id;
 300
 301         /* FIXME: finish the array */
 302         return NULL;
 303 }
 304
 305 /**
 306  * Creates a Firm type for an imaginary type
 307  */
 308 static ir_type *create_imaginary_type(const atomic_type_t *type)
 309 {
 310         return create_atomic_type(type->akind, (const type_t*)type);
 311 }
 312
 313 /**
 314  * return type of a parameter (and take transparent union gnu extension into
 315  * account)
 316  */
 317 static type_t *get_parameter_type(type_t *orig_type)
 318 {
 319         type_t *type = skip_typeref(orig_type);
 320         if (is_type_union(type)
 321                         && get_type_modifiers(orig_type) & DM_TRANSPARENT_UNION) {
 322                 compound_t *compound = type->compound.compound;
 323                 type                 = compound->members.entities->declaration.type;
 324         }
 325
 326         return type;
 327 }
 328
 329 static ir_type *create_method_type(const function_type_t *function_type, bool for_closure)
 330 {
 331         type_t        *return_type  = skip_typeref(function_type->return_type);
 332
 333         int            n_parameters = count_parameters(function_type)
 334                                        + (for_closure ? 1 : 0);
 335         int            n_results    = is_type_void(return_type) ? 0 : 1;
 336         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) function_type);
 337         ir_type       *irtype       = new_d_type_method(n_parameters, n_results, dbgi);
 338
 339         if (!is_type_void(return_type)) {
 340                 ir_type *restype = get_ir_type(return_type);
 341                 set_method_res_type(irtype, 0, restype);
 342         }
 343
 344         function_parameter_t *parameter = function_type->parameters;
 345         int                   n         = 0;
 346         if (for_closure) {
 347                 ir_type *p_irtype = get_ir_type(type_void_ptr);
 348                 set_method_param_type(irtype, n, p_irtype);
 349                 ++n;
 350         }
 351         for ( ; parameter != NULL; parameter = parameter->next) {
 352                 type_t  *type     = get_parameter_type(parameter->type);
 353                 ir_type *p_irtype = get_ir_type(type);
 354                 set_method_param_type(irtype, n, p_irtype);
 355                 ++n;
 356         }
 357
 358         bool is_variadic = function_type->variadic;
 359
 360         if (is_variadic)
 361                 set_method_variadicity(irtype, variadicity_variadic);
 362
 363         unsigned cc = get_method_calling_convention(irtype);
 364         switch (function_type->calling_convention) {
 365         case CC_DEFAULT: /* unspecified calling convention, equal to one of the other, typically cdecl */
 366         case CC_CDECL:
 367 is_cdecl:
 368                 set_method_calling_convention(irtype, SET_CDECL(cc));
 369                 break;
 370
 371         case CC_STDCALL:
 372                 if (is_variadic)
 373                         goto is_cdecl;
 374
 375                 /* only non-variadic function can use stdcall, else use cdecl */
 376                 set_method_calling_convention(irtype, SET_STDCALL(cc));
 377                 break;
 378
 379         case CC_FASTCALL:
 380                 if (is_variadic)
 381                         goto is_cdecl;
 382                 /* only non-variadic function can use fastcall, else use cdecl */
 383                 set_method_calling_convention(irtype, SET_FASTCALL(cc));
 384                 break;
 385
 386         case CC_THISCALL:
 387                 /* Hmm, leave default, not accepted by the parser yet. */
 388                 break;
 389         }
 390
 391         if (for_closure)
 392                 set_method_calling_convention(irtype, get_method_calling_convention(irtype) | cc_this_call);
 393
 394         const decl_modifiers_t modifiers = function_type->modifiers;
 395         if (modifiers & DM_CONST)
 396                 add_method_additional_properties(irtype, mtp_property_const);
 397         if (modifiers & DM_PURE)
 398                 add_method_additional_properties(irtype, mtp_property_pure);
 399         if (modifiers & DM_RETURNS_TWICE)
 400                 add_method_additional_properties(irtype, mtp_property_returns_twice);
 401         if (modifiers & DM_NORETURN)
 402                 add_method_additional_properties(irtype, mtp_property_noreturn);
 403         if (modifiers & DM_NOTHROW)
 404                 add_method_additional_properties(irtype, mtp_property_nothrow);
 405         if (modifiers & DM_MALLOC)
 406                 add_method_additional_properties(irtype, mtp_property_malloc);
 407
 408         return irtype;
 409 }
 410
 411 static ir_type *create_pointer_type(pointer_type_t *type)
 412 {
 413         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) type);
 414         type_t        *points_to    = type->points_to;
 415         ir_type       *ir_points_to = get_ir_type_incomplete(points_to);
 416         ir_type       *irtype       = new_d_type_pointer(ir_points_to, dbgi);
 417
 418         return irtype;
 419 }
 420
 421 static ir_type *create_reference_type(reference_type_t *type)
 422 {
 423         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) type);
 424         type_t        *refers_to    = type->refers_to;
 425         ir_type       *ir_refers_to = get_ir_type_incomplete(refers_to);
 426         ir_type       *irtype       = new_d_type_pointer(ir_refers_to, dbgi);
 427
 428         return irtype;
 429 }
 430
 431 static ir_type *create_array_type(array_type_t *type)
 432 {
 433         type_dbg_info *dbgi            = get_type_dbg_info_((const type_t*) type);
 434         type_t        *element_type    = type->element_type;
 435         ir_type       *ir_element_type = get_ir_type(element_type);
 436         ir_type       *irtype          = new_d_type_array(1, ir_element_type, dbgi);
 437
 438         const int align = get_type_alignment_bytes(ir_element_type);
 439         set_type_alignment_bytes(irtype, align);
 440
 441         if (type->size_constant) {
 442                 int n_elements = type->size;
 443
 444                 set_array_bounds_int(irtype, 0, 0, n_elements);
 445
 446                 size_t elemsize = get_type_size_bytes(ir_element_type);
 447                 if (elemsize % align > 0) {
 448                         elemsize += align - (elemsize % align);
 449                 }
 450                 set_type_size_bytes(irtype, n_elements * elemsize);
 451         } else {
 452                 set_array_lower_bound_int(irtype, 0, 0);
 453         }
 454         set_type_state(irtype, layout_fixed);
 455
 456         return irtype;
 457 }
 458
 459 /**
 460  * Return the signed integer type of size bits.
 461  *
 462  * @param size   the size
 463  */
 464 static ir_type *get_signed_int_type_for_bit_size(ir_type *base_tp,
 465                                                  unsigned size,
 466                                                                                                  const type_t *type)
 467 {
 468         static ir_mode *s_modes[64 + 1] = {NULL, };
 469         ir_type *res;
 470         ir_mode *mode;
 471
 472         if (size <= 0 || size > 64)
 473                 return NULL;
 474
 475         mode = s_modes[size];
 476         if (mode == NULL) {
 477                 char name[32];
 478
 479                 snprintf(name, sizeof(name), "bf_I%u", size);
 480                 mode = new_int_mode(name, irma_twos_complement, size, 1, 0);
 481                 s_modes[size] = mode;
 482         }
 483
 484         type_dbg_info *dbgi = get_type_dbg_info_(type);
 485         res                 = new_d_type_primitive(mode, dbgi);
 486         set_primitive_base_type(res, base_tp);
 487
 488         return res;
 489 }
 490
 491 /**
 492  * Return the unsigned integer type of size bits.
 493  *
 494  * @param size   the size
 495  */
 496 static ir_type *get_unsigned_int_type_for_bit_size(ir_type *base_tp,
 497                                                    unsigned size,
 498                                                                                                    const type_t *type)
 499 {
 500         static ir_mode *u_modes[64 + 1] = {NULL, };
 501         ir_type *res;
 502         ir_mode *mode;
 503
 504         if (size <= 0 || size > 64)
 505                 return NULL;
 506
 507         mode = u_modes[size];
 508         if (mode == NULL) {
 509                 char name[32];
 510
 511                 snprintf(name, sizeof(name), "bf_U%u", size);
 512                 mode = new_int_mode(name, irma_twos_complement, size, 0, 0);
 513                 u_modes[size] = mode;
 514         }
 515
 516         type_dbg_info *dbgi = get_type_dbg_info_(type);
 517         res = new_d_type_primitive(mode, dbgi);
 518         set_primitive_base_type(res, base_tp);
 519
 520         return res;
 521 }
 522
 523 static ir_type *create_bitfield_type(const entity_t *entity)
 524 {
 525         assert(entity->kind == ENTITY_COMPOUND_MEMBER);
 526         type_t *base = skip_typeref(entity->declaration.type);
 527         assert(is_type_integer(base));
 528         ir_type *irbase = get_ir_type(base);
 529
 530         unsigned bit_size = entity->compound_member.bit_size;
 531
 532         if (is_type_signed(base)) {
 533                 return get_signed_int_type_for_bit_size(irbase, bit_size, base);
 534         } else {
 535                 return get_unsigned_int_type_for_bit_size(irbase, bit_size, base);
 536         }
 537 }
 538
 539 /**
 540  * Construct firm type from ast struct type.
 541  */
 542 static ir_type *create_compound_type(compound_type_t *const type, bool const incomplete)
 543 {
 544         compound_t *compound = type->compound;
 545
 546         if (compound->irtype != NULL && (compound->irtype_complete || incomplete)) {
 547                 return compound->irtype;
 548         }
 549
 550         bool const is_union = type->base.kind == TYPE_COMPOUND_UNION;
 551
 552         symbol_t *type_symbol = compound->base.symbol;
 553         ident    *id;
 554         if (type_symbol != NULL) {
 555                 id = new_id_from_str(type_symbol->string);
 556         } else {
 557                 if (is_union) {
 558                         id = id_unique("__anonymous_union.%u");
 559                 } else {
 560                         id = id_unique("__anonymous_struct.%u");
 561                 }
 562         }
 563
 564         ir_type *irtype;
 565         if (is_union) {
 566                 irtype = new_type_union(id);
 567         } else {
 568                 irtype = new_type_struct(id);
 569         }
 570
 571         compound->irtype_complete = false;
 572         compound->irtype          = irtype;
 573
 574         if (incomplete)
 575                 return irtype;
 576
 577         if (is_union) {
 578                 layout_union_type(type);
 579         } else {
 580                 layout_struct_type(type);
 581         }
 582
 583         compound->irtype_complete = true;
 584
 585         entity_t *entry = compound->members.entities;
 586         for ( ; entry != NULL; entry = entry->base.next) {
 587                 if (entry->kind != ENTITY_COMPOUND_MEMBER)
 588                         continue;
 589
 590                 symbol_t *symbol     = entry->base.symbol;
 591                 type_t   *entry_type = entry->declaration.type;
 592                 ident    *ident;
 593                 if (symbol == NULL) {
 594                         /* anonymous bitfield member, skip */
 595                         if (entry->compound_member.bitfield)
 596                                 continue;
 597                         assert(is_type_compound(entry_type));
 598                         ident = id_unique("anon.%u");
 599                 } else {
 600                         ident = new_id_from_str(symbol->string);
 601                 }
 602
 603                 dbg_info *dbgi       = get_dbg_info(&entry->base.source_position);
 604
 605                 ir_type *entry_irtype;
 606                 if (entry->compound_member.bitfield) {
 607                         entry_irtype = create_bitfield_type(entry);
 608                 } else {
 609                         entry_irtype = get_ir_type(entry_type);
 610                 }
 611                 ir_entity *entity = new_d_entity(irtype, ident, entry_irtype, dbgi);
 612
 613                 set_entity_offset(entity, entry->compound_member.offset);
 614                 set_entity_offset_bits_remainder(entity,
 615                                                  entry->compound_member.bit_offset);
 616
 617                 assert(entry->declaration.kind == DECLARATION_KIND_UNKNOWN);
 618                 entry->declaration.kind       = DECLARATION_KIND_COMPOUND_MEMBER;
 619                 entry->compound_member.entity = entity;
 620         }
 621
 622         set_type_alignment_bytes(irtype, compound->alignment);
 623         set_type_size_bytes(irtype, compound->size);
 624         set_type_state(irtype, layout_fixed);
 625
 626         return irtype;
 627 }
 628
 629 void determine_enum_values(enum_type_t *const type)
 630 {
 631         ir_mode   *const mode    = atomic_modes[type->base.akind];
 632         ir_tarval *const one     = get_mode_one(mode);
 633         ir_tarval *      tv_next = get_mode_null(mode);
 634
 635         enum_t   *enume = type->enume;
 636         entity_t *entry = enume->base.next;
 637         for (; entry != NULL; entry = entry->base.next) {
 638                 if (entry->kind != ENTITY_ENUM_VALUE)
 639                         break;
 640
 641                 expression_t *const init = entry->enum_value.value;
 642                 if (init != NULL) {
 643                         tv_next = fold_constant_to_tarval(init);
 644                 }
 645                 assert(entry->enum_value.tv == NULL || entry->enum_value.tv == tv_next);
 646                 entry->enum_value.tv = tv_next;
 647                 tv_next = tarval_add(tv_next, one);
 648         }
 649 }
 650
 651 static ir_type *create_enum_type(enum_type_t *const type)
 652 {
 653         return create_atomic_type(type->base.akind, (const type_t*) type);
 654 }
 655
 656 static ir_type *get_ir_type_incomplete(type_t *type)
 657 {
 658         type = skip_typeref(type);
 659
 660         if (type->base.firm_type != NULL) {
 661                 return type->base.firm_type;
 662         }
 663
 664         if (is_type_compound(type)) {
 665                 return create_compound_type(&type->compound, true);
 666         } else {
 667                 return get_ir_type(type);
 668         }
 669 }
 670
 671 ir_type *get_ir_type(type_t *type)
 672 {
 673         type = skip_typeref(type);
 674
 675         if (type->base.firm_type != NULL) {
 676                 return type->base.firm_type;
 677         }
 678
 679         ir_type *firm_type = NULL;
 680         switch (type->kind) {
 681         case TYPE_ATOMIC:
 682                 firm_type = create_atomic_type(type->atomic.akind, type);
 683                 break;
 684         case TYPE_COMPLEX:
 685                 firm_type = create_complex_type(&type->atomic);
 686                 break;
 687         case TYPE_IMAGINARY:
 688                 firm_type = create_imaginary_type(&type->atomic);
 689                 break;
 690         case TYPE_FUNCTION:
 691                 firm_type = create_method_type(&type->function, false);
 692                 break;
 693         case TYPE_POINTER:
 694                 firm_type = create_pointer_type(&type->pointer);
 695                 break;
 696         case TYPE_REFERENCE:
 697                 firm_type = create_reference_type(&type->reference);
 698                 break;
 699         case TYPE_ARRAY:
 700                 firm_type = create_array_type(&type->array);
 701                 break;
 702         case TYPE_COMPOUND_STRUCT:
 703         case TYPE_COMPOUND_UNION:
 704                 firm_type = create_compound_type(&type->compound, false);
 705                 break;
 706         case TYPE_ENUM:
 707                 firm_type = create_enum_type(&type->enumt);
 708                 break;
 709
 710         case TYPE_ERROR:
 711         case TYPE_TYPEOF:
 712         case TYPE_TYPEDEF:
 713                 break;
 714         }
 715         if (firm_type == NULL)
 716                 panic("unknown type found");
 717
 718         type->base.firm_type = firm_type;
 719         return firm_type;
 720 }
 721
 722 static ir_mode *get_ir_mode_storage(type_t *type)
 723 {
 724         type = skip_typeref(type);
 725
 726         /* Firm doesn't report a mode for arrays and structs/unions. */
 727         if (!is_type_scalar(type)) {
 728                 return mode_P_data;
 729         }
 730
 731         ir_type *const irtype = get_ir_type(type);
 732         ir_mode *const mode   = get_type_mode(irtype);
 733         assert(mode != NULL);
 734         return mode;
 735 }
 736
 737 /*
 738  * get arithmetic mode for a type. This is different from get_ir_mode_storage,
 739  * int that it returns bigger modes for floating point on some platforms
 740  * (x87 internally does arithemtic with 80bits)
 741  */
 742 static ir_mode *get_ir_mode_arithmetic(type_t *type)
 743 {
 744         ir_mode *mode = get_ir_mode_storage(type);
 745         if (mode_is_float(mode) && mode_float_arithmetic != NULL) {
 746                 return mode_float_arithmetic;
 747         }
 748
 749         return mode;
 750 }
 751
 752 /**
 753  * Return a node representing the size of a type.
 754  */
 755 static ir_node *get_type_size_node(type_t *type)
 756 {
 757         unsigned size;
 758         ir_mode *mode = get_ir_mode_arithmetic(type_size_t);
 759         type = skip_typeref(type);
 760
 761         if (is_type_array(type) && type->array.is_vla) {
 762                 ir_node *size_node = get_vla_size(&type->array);
 763                 ir_node *elem_size = get_type_size_node(type->array.element_type);
 764                 ir_node *real_size = new_d_Mul(NULL, size_node, elem_size, mode);
 765                 return real_size;
 766         }
 767
 768         size = get_type_size(type);
 769         return new_Const_long(mode, size);
 770 }
 771
 772 /** Names of the runtime functions. */
 773 static const struct {
 774         int        id;           /**< the rts id */
 775         int        n_res;        /**< number of return values */
 776         const char *name;        /**< the name of the rts function */
 777         int        n_params;     /**< number of parameters */
 778         unsigned   flags;        /**< language flags */
 779 } rts_data[] = {
 780         { rts_debugbreak, 0, "__debugbreak", 0, _MS },
 781         { rts_abort,      0, "abort",        0, _C89 },
 782         { rts_alloca,     1, "alloca",       1, _ALL },
 783         { rts_abs,        1, "abs",          1, _C89 },
 784         { rts_labs,       1, "labs",         1, _C89 },
 785         { rts_llabs,      1, "llabs",        1, _C99 },
 786         { rts_imaxabs,    1, "imaxabs",      1, _C99 },
 787
 788         { rts_fabs,       1, "fabs",         1, _C89 },
 789         { rts_sqrt,       1, "sqrt",         1, _C89 },
 790         { rts_cbrt,       1, "cbrt",         1, _C99 },
 791         { rts_exp,        1, "exp",          1, _C89 },
 792         { rts_exp2,       1, "exp2",         1, _C89 },
 793         { rts_exp10,      1, "exp10",        1, _GNUC },
 794         { rts_log,        1, "log",          1, _C89 },
 795         { rts_log2,       1, "log2",         1, _C89 },
 796         { rts_log10,      1, "log10",        1, _C89 },
 797         { rts_pow,        1, "pow",          2, _C89 },
 798         { rts_sin,        1, "sin",          1, _C89 },
 799         { rts_cos,        1, "cos",          1, _C89 },
 800         { rts_tan,        1, "tan",          1, _C89 },
 801         { rts_asin,       1, "asin",         1, _C89 },
 802         { rts_acos,       1, "acos",         1, _C89 },
 803         { rts_atan,       1, "atan",         1, _C89 },
 804         { rts_sinh,       1, "sinh",         1, _C89 },
 805         { rts_cosh,       1, "cosh",         1, _C89 },
 806         { rts_tanh,       1, "tanh",         1, _C89 },
 807
 808         { rts_fabsf,      1, "fabsf",        1, _C99 },
 809         { rts_sqrtf,      1, "sqrtf",        1, _C99 },
 810         { rts_cbrtf,      1, "cbrtf",        1, _C99 },
 811         { rts_expf,       1, "expf",         1, _C99 },
 812         { rts_exp2f,      1, "exp2f",        1, _C99 },
 813         { rts_exp10f,     1, "exp10f",       1, _GNUC },
 814         { rts_logf,       1, "logf",         1, _C99 },
 815         { rts_log2f,      1, "log2f",        1, _C99 },
 816         { rts_log10f,     1, "log10f",       1, _C99 },
 817         { rts_powf,       1, "powf",         2, _C99 },
 818         { rts_sinf,       1, "sinf",         1, _C99 },
 819         { rts_cosf,       1, "cosf",         1, _C99 },
 820         { rts_tanf,       1, "tanf",         1, _C99 },
 821         { rts_asinf,      1, "asinf",        1, _C99 },
 822         { rts_acosf,      1, "acosf",        1, _C99 },
 823         { rts_atanf,      1, "atanf",        1, _C99 },
 824         { rts_sinhf,      1, "sinhf",        1, _C99 },
 825         { rts_coshf,      1, "coshf",        1, _C99 },
 826         { rts_tanhf,      1, "tanhf",        1, _C99 },
 827
 828         { rts_fabsl,      1, "fabsl",        1, _C99 },
 829         { rts_sqrtl,      1, "sqrtl",        1, _C99 },
 830         { rts_cbrtl,      1, "cbrtl",        1, _C99 },
 831         { rts_expl,       1, "expl",         1, _C99 },
 832         { rts_exp2l,      1, "exp2l",        1, _C99 },
 833         { rts_exp10l,     1, "exp10l",       1, _GNUC },
 834         { rts_logl,       1, "logl",         1, _C99 },
 835         { rts_log2l,      1, "log2l",        1, _C99 },
 836         { rts_log10l,     1, "log10l",       1, _C99 },
 837         { rts_powl,       1, "powl",         2, _C99 },
 838         { rts_sinl,       1, "sinl",         1, _C99 },
 839         { rts_cosl,       1, "cosl",         1, _C99 },
 840         { rts_tanl,       1, "tanl",         1, _C99 },
 841         { rts_asinl,      1, "asinl",        1, _C99 },
 842         { rts_acosl,      1, "acosl",        1, _C99 },
 843         { rts_atanl,      1, "atanl",        1, _C99 },
 844         { rts_sinhl,      1, "sinhl",        1, _C99 },
 845         { rts_coshl,      1, "coshl",        1, _C99 },
 846         { rts_tanhl,      1, "tanhl",        1, _C99 },
 847
 848         { rts_strcmp,     1, "strcmp",       2, _C89 },
 849         { rts_strncmp,    1, "strncmp",      3, _C89 },
 850         { rts_strcpy,     1, "strcpy",       2, _C89 },
 851         { rts_strlen,     1, "strlen",       1, _C89 },
 852         { rts_memcpy,     1, "memcpy",       3, _C89 },
 853         { rts_mempcpy,    1, "mempcpy",      3, _GNUC },
 854         { rts_memmove,    1, "memmove",      3, _C89 },
 855         { rts_memset,     1, "memset",       3, _C89 },
 856         { rts_memcmp,     1, "memcmp",       3, _C89 },
 857 };
 858
 859 static ident *rts_idents[lengthof(rts_data)];
 860
 861 static create_ld_ident_func create_ld_ident = create_name_linux_elf;
 862
 863 void set_create_ld_ident(ident *(*func)(entity_t*))
 864 {
 865         create_ld_ident = func;
 866 }
 867
 868 static bool declaration_is_definition(const entity_t *entity)
 869 {
 870         switch (entity->kind) {
 871         case ENTITY_VARIABLE:
 872                 return entity->declaration.storage_class != STORAGE_CLASS_EXTERN;
 873         case ENTITY_FUNCTION:
 874                 return entity->function.body != NULL;
 875         case ENTITY_PARAMETER:
 876         case ENTITY_COMPOUND_MEMBER:
 877                 return false;
 878         case ENTITY_TYPEDEF:
 879         case ENTITY_ENUM:
 880         case ENTITY_ENUM_VALUE:
 881         case ENTITY_NAMESPACE:
 882         case ENTITY_LABEL:
 883         case ENTITY_LOCAL_LABEL:
 884                 break;
 885         }
 886         panic("entity is not a declaration");
 887 }
 888
 889 /**
 890  * Handle GNU attributes for entities
 891  *
 892  * @param ent   the entity
 893  * @param decl  the routine declaration
 894  */
 895 static void handle_decl_modifiers(ir_entity *irentity, entity_t *entity)
 896 {
 897         assert(is_declaration(entity));
 898         decl_modifiers_t modifiers = entity->declaration.modifiers;
 899
 900         if (is_method_entity(irentity)) {
 901                 if (modifiers & DM_PURE)
 902                         add_entity_additional_properties(irentity, mtp_property_pure);
 903                 if (modifiers & DM_CONST)
 904                         add_entity_additional_properties(irentity, mtp_property_const);
 905                 if (modifiers & DM_NOINLINE)
 906                         add_entity_additional_properties(irentity, mtp_property_noinline);
 907                 if (modifiers & DM_FORCEINLINE)
 908                         add_entity_additional_properties(irentity, mtp_property_always_inline);
 909                 if (modifiers & DM_NAKED)
 910                         add_entity_additional_properties(irentity, mtp_property_naked);
 911                 if (entity->kind == ENTITY_FUNCTION && entity->function.is_inline)
 912                         add_entity_additional_properties(irentity,
 913                                                                                          mtp_property_inline_recommended);
 914         }
 915         if ((modifiers & DM_USED) && declaration_is_definition(entity)) {
 916                 add_entity_linkage(irentity, IR_LINKAGE_HIDDEN_USER);
 917         }
 918         if ((modifiers & DM_WEAK) && declaration_is_definition(entity)
 919             && entity->declaration.storage_class != STORAGE_CLASS_EXTERN) {
 920                 add_entity_linkage(irentity, IR_LINKAGE_WEAK);
 921         }
 922 }
 923
 924 static bool is_main(entity_t *entity)
 925 {
 926         static symbol_t *sym_main = NULL;
 927         if (sym_main == NULL) {
 928                 sym_main = symbol_table_insert("main");
 929         }
 930
 931         if (entity->base.symbol != sym_main)
 932                 return false;
 933         /* must be in outermost scope */
 934         if (entity->base.parent_scope != &current_translation_unit->scope)
 935                 return false;
 936
 937         return true;
 938 }
 939
 940 /**
 941  * Creates an entity representing a function.
 942  *
 943  * @param entity       the function declaration/definition
 944  * @param owner_type   the owner type of this function, NULL
 945  *                     for global functions
 946  */
 947 static ir_entity *get_function_entity(entity_t *entity, ir_type *owner_type)
 948 {
 949         assert(entity->kind == ENTITY_FUNCTION);
 950         if (entity->function.irentity != NULL)
 951                 return entity->function.irentity;
 952
 953         switch (entity->function.btk) {
 954         case BUILTIN_NONE:
 955         case BUILTIN_LIBC:
 956         case BUILTIN_LIBC_CHECK:
 957                 break;
 958         default:
 959                 return NULL;
 960         }
 961
 962         symbol_t *symbol = entity->base.symbol;
 963         ident    *id     = new_id_from_str(symbol->string);
 964
 965         /* already an entity defined? */
 966         ir_entity *irentity = entitymap_get(&entitymap, symbol);
 967         bool const has_body = entity->function.body != NULL;
 968         if (irentity != NULL) {
 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                 storage_class_tag_t const storage_class
 998                         = (storage_class_tag_t) entity->declaration.storage_class;
 999                 if (storage_class == STORAGE_CLASS_STATIC) {
1000                     set_entity_visibility(irentity, ir_visibility_local);
1001                 } else {
1002                     set_entity_visibility(irentity, ir_visibility_external);
1003                 }
1004
1005                 bool const is_inline = entity->function.is_inline;
1006                 if (is_inline && has_body) {
1007                         if (((c_mode & _C99) && storage_class == STORAGE_CLASS_NONE)
1008                             || ((c_mode & _C99) == 0
1009                                 && storage_class == STORAGE_CLASS_EXTERN)) {
1010                                 add_entity_linkage(irentity, IR_LINKAGE_NO_CODEGEN);
1011                         }
1012                 }
1013         } else {
1014                 /* nested functions are always local */
1015                 set_entity_visibility(irentity, ir_visibility_local);
1016         }
1017
1018         /* We should check for file scope here, but as long as we compile C only
1019            this is not needed. */
1020         if (!freestanding && !has_body) {
1021                 /* check for a known runtime function */
1022                 for (size_t i = 0; i < lengthof(rts_data); ++i) {
1023                         if (id != rts_idents[i])
1024                                 continue;
1025
1026                         function_type_t *function_type
1027                                 = &entity->declaration.type->function;
1028                         /* rts_entities code can't handle a "wrong" number of parameters */
1029                         if (function_type->unspecified_parameters)
1030                                 continue;
1031
1032                         /* check number of parameters */
1033                         int n_params = count_parameters(function_type);
1034                         if (n_params != rts_data[i].n_params)
1035                                 continue;
1036
1037                         type_t *return_type = skip_typeref(function_type->return_type);
1038                         int     n_res       = is_type_void(return_type) ? 0 : 1;
1039                         if (n_res != rts_data[i].n_res)
1040                                 continue;
1041
1042                         /* ignore those rts functions not necessary needed for current mode */
1043                         if ((c_mode & rts_data[i].flags) == 0)
1044                                 continue;
1045                         assert(rts_entities[rts_data[i].id] == NULL);
1046                         rts_entities[rts_data[i].id] = irentity;
1047                 }
1048         }
1049
1050         entitymap_insert(&entitymap, symbol, irentity);
1051
1052 entity_created:
1053         entity->declaration.kind  = DECLARATION_KIND_FUNCTION;
1054         entity->function.irentity = irentity;
1055
1056         return irentity;
1057 }
1058
1059 /**
1060  * Creates a SymConst for a given entity.
1061  *
1062  * @param dbgi    debug info
1063  * @param entity  the entity
1064  */
1065 static ir_node *create_symconst(dbg_info *dbgi, ir_entity *entity)
1066 {
1067         assert(entity != NULL);
1068         union symconst_symbol sym;
1069         sym.entity_p = entity;
1070         return new_d_SymConst(dbgi, mode_P, sym, symconst_addr_ent);
1071 }
1072
1073 static ir_node *create_Const_from_bool(ir_mode *const mode, bool const v)
1074 {
1075         return new_Const((v ? get_mode_one : get_mode_null)(mode));
1076 }
1077
1078 static ir_node *create_conv_from_b(dbg_info *dbgi, ir_node *value,
1079                                    ir_mode *dest_mode)
1080 {
1081         if (is_Const(value)) {
1082                 return create_Const_from_bool(dest_mode, !is_Const_null(value));
1083         }
1084
1085         ir_node *cond       = new_d_Cond(dbgi, value);
1086         ir_node *proj_true  = new_Proj(cond, mode_X, pn_Cond_true);
1087         ir_node *proj_false = new_Proj(cond, mode_X, pn_Cond_false);
1088         ir_node *tblock     = new_Block(1, &proj_true);
1089         ir_node *fblock     = new_Block(1, &proj_false);
1090         set_cur_block(tblock);
1091         ir_node *const1 = new_Const(get_mode_one(dest_mode));
1092         ir_node *tjump  = new_Jmp();
1093         set_cur_block(fblock);
1094         ir_node *const0 = new_Const(get_mode_null(dest_mode));
1095         ir_node *fjump  = new_Jmp();
1096
1097         ir_node *in[2]      = { tjump, fjump };
1098         ir_node *mergeblock = new_Block(2, in);
1099         set_cur_block(mergeblock);
1100         ir_node *phi_in[2]  = { const1, const0 };
1101         ir_node *phi        = new_Phi(2, phi_in, dest_mode);
1102         return phi;
1103 }
1104
1105 static ir_node *create_conv(dbg_info *dbgi, ir_node *value, ir_mode *dest_mode)
1106 {
1107         ir_mode *value_mode = get_irn_mode(value);
1108
1109         if (value_mode == dest_mode)
1110                 return value;
1111
1112         if (dest_mode == mode_b) {
1113                 ir_node *zero = new_Const(get_mode_null(value_mode));
1114                 ir_node *cmp  = new_d_Cmp(dbgi, value, zero, ir_relation_unordered_less_greater);
1115                 return cmp;
1116         } else if (value_mode == mode_b) {
1117                 return create_conv_from_b(dbgi, value, dest_mode);
1118         }
1119
1120         return new_d_Conv(dbgi, value, dest_mode);
1121 }
1122
1123 /**
1124  * Creates a SymConst node representing a string constant.
1125  *
1126  * @param src_pos    the source position of the string constant
1127  * @param id_prefix  a prefix for the name of the generated string constant
1128  * @param value      the value of the string constant
1129  */
1130 static ir_node *string_to_firm(source_position_t const *const src_pos, char const *const id_prefix, string_t const *const value)
1131 {
1132         size_t            const slen        = get_string_len(value) + 1;
1133         ir_initializer_t *const initializer = create_initializer_compound(slen);
1134         ir_type          *      elem_type;
1135         switch (value->encoding) {
1136         case STRING_ENCODING_CHAR:
1137         case STRING_ENCODING_UTF8: {
1138                 elem_type = ir_type_char;
1139
1140                 ir_mode *const mode = get_type_mode(elem_type);
1141                 char const    *p    = value->begin;
1142                 for (size_t i = 0; i < slen; ++i) {
1143                         ir_tarval        *tv  = new_tarval_from_long(*p++, mode);
1144                         ir_initializer_t *val = create_initializer_tarval(tv);
1145                         set_initializer_compound_value(initializer, i, val);
1146                 }
1147                 goto finish;
1148         }
1149
1150         {
1151                 type_t *type;
1152         case STRING_ENCODING_CHAR16: type = type_char16_t; goto init_wide;
1153         case STRING_ENCODING_CHAR32: type = type_char32_t; goto init_wide;
1154         case STRING_ENCODING_WIDE:   type = type_wchar_t;  goto init_wide;
1155 init_wide:;
1156                 elem_type = get_ir_type(type);
1157
1158                 ir_mode *const mode = get_type_mode(elem_type);
1159                 char const    *p    = value->begin;
1160                 for (size_t i = 0; i < slen; ++i) {
1161                         assert(p <= value->begin + value->size);
1162                         utf32             v   = read_utf8_char(&p);
1163                         ir_tarval        *tv  = new_tarval_from_long(v, mode);
1164                         ir_initializer_t *val = create_initializer_tarval(tv);
1165                         set_initializer_compound_value(initializer, i, val);
1166                 }
1167                 goto finish;
1168         }
1169         }
1170         panic("invalid string encoding");
1171
1172 finish:;
1173         ir_type *const type = new_type_array(1, elem_type);
1174         set_array_bounds_int(type, 0, 0, slen);
1175         set_type_size_bytes( type, slen * get_type_size_bytes(elem_type));
1176         set_type_state(      type, layout_fixed);
1177
1178         ir_type   *const global_type = get_glob_type();
1179         ident     *const id          = id_unique(id_prefix);
1180         dbg_info  *const dbgi        = get_dbg_info(src_pos);
1181         ir_entity *const entity      = new_d_entity(global_type, id, type, dbgi);
1182         set_entity_ld_ident(   entity, id);
1183         set_entity_visibility( entity, ir_visibility_private);
1184         add_entity_linkage(    entity, IR_LINKAGE_CONSTANT);
1185         set_entity_initializer(entity, initializer);
1186
1187         return create_symconst(dbgi, entity);
1188 }
1189
1190 static bool try_create_integer(literal_expression_t *literal, type_t *type)
1191 {
1192         assert(type->kind == TYPE_ATOMIC);
1193         atomic_type_kind_t akind = type->atomic.akind;
1194
1195         ir_mode    *const mode = atomic_modes[akind];
1196         char const *const str  = literal->value.begin;
1197         ir_tarval  *const tv   = new_tarval_from_str(str, literal->suffix - str, mode);
1198         if (tv == tarval_bad)
1199                 return false;
1200
1201         literal->base.type    = type;
1202         literal->target_value = tv;
1203         return true;
1204 }
1205
1206 void determine_literal_type(literal_expression_t *const literal)
1207 {
1208         assert(literal->base.kind == EXPR_LITERAL_INTEGER);
1209
1210         /* -1: signed only, 0: any, 1: unsigned only */
1211         int const sign =
1212                 !is_type_signed(literal->base.type) ? 1 :
1213                 literal->value.begin[0] == '0'      ? 0 :
1214                 -1; /* Decimal literals only try signed types. */
1215
1216         tarval_int_overflow_mode_t old_mode = tarval_get_integer_overflow_mode();
1217         tarval_set_integer_overflow_mode(TV_OVERFLOW_BAD);
1218
1219         if (try_create_integer(literal, literal->base.type))
1220                 goto finished;
1221
1222         /* now try if the constant is small enough for some types */
1223         if (sign >= 0 && try_create_integer(literal, type_unsigned_int))
1224                 goto finished;
1225         if (sign <= 0 && try_create_integer(literal, type_long))
1226                 goto finished;
1227         if (sign >= 0 && try_create_integer(literal, type_unsigned_long))
1228                 goto finished;
1229         /* last try? then we should not report tarval_bad */
1230         if (sign < 0)
1231                 tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
1232         if (sign <= 0 && try_create_integer(literal, type_long_long))
1233                 goto finished;
1234
1235         /* last try */
1236         assert(sign >= 0);
1237         tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
1238         bool res = try_create_integer(literal, type_unsigned_long_long);
1239         if (!res)
1240                 panic("internal error when parsing number literal");
1241
1242 finished:
1243         tarval_set_integer_overflow_mode(old_mode);
1244 }
1245
1246 /**
1247  * Creates a Const node representing a constant.
1248  */
1249 static ir_node *literal_to_firm(const literal_expression_t *literal)
1250 {
1251         type_t     *type   = skip_typeref(literal->base.type);
1252         ir_mode    *mode   = get_ir_mode_storage(type);
1253         const char *string = literal->value.begin;
1254         size_t      size   = literal->value.size;
1255         ir_tarval  *tv;
1256
1257         switch (literal->base.kind) {
1258         case EXPR_LITERAL_INTEGER:
1259                 assert(literal->target_value != NULL);
1260                 tv = literal->target_value;
1261                 break;
1262
1263         case EXPR_LITERAL_FLOATINGPOINT:
1264                 tv = new_tarval_from_str(string, size, mode);
1265                 break;
1266
1267         case EXPR_LITERAL_BOOLEAN:
1268                 if (string[0] == 't') {
1269                         tv = get_mode_one(mode);
1270                 } else {
1271                         assert(string[0] == 'f');
1272         case EXPR_LITERAL_MS_NOOP:
1273                         tv = get_mode_null(mode);
1274                 }
1275                 break;
1276
1277         default:
1278                 panic("invalid literal kind");
1279         }
1280
1281         dbg_info *dbgi       = get_dbg_info(&literal->base.source_position);
1282         ir_node  *res        = new_d_Const(dbgi, tv);
1283         ir_mode  *mode_arith = get_ir_mode_arithmetic(type);
1284         return create_conv(dbgi, res, mode_arith);
1285 }
1286
1287 /**
1288  * Creates a Const node representing a character constant.
1289  */
1290 static ir_node *char_literal_to_firm(string_literal_expression_t const *literal)
1291 {
1292         type_t     *type   = skip_typeref(literal->base.type);
1293         ir_mode    *mode   = get_ir_mode_storage(type);
1294         const char *string = literal->value.begin;
1295         size_t      size   = literal->value.size;
1296         ir_tarval  *tv;
1297
1298         switch (literal->value.encoding) {
1299         case STRING_ENCODING_WIDE: {
1300                 utf32  v = read_utf8_char(&string);
1301                 char   buf[128];
1302                 size_t len = snprintf(buf, sizeof(buf), UTF32_PRINTF_FORMAT, v);
1303
1304                 tv = new_tarval_from_str(buf, len, mode);
1305                 break;
1306         }
1307
1308         case STRING_ENCODING_CHAR: {
1309                 long long int v;
1310                 bool char_is_signed
1311                         = get_atomic_type_flags(ATOMIC_TYPE_CHAR) & ATOMIC_TYPE_FLAG_SIGNED;
1312                 if (size == 1 && char_is_signed) {
1313                         v = (signed char)string[0];
1314                 } else {
1315                         v = 0;
1316                         for (size_t i = 0; i < size; ++i) {
1317                                 v = (v << 8) | ((unsigned char)string[i]);
1318                         }
1319                 }
1320                 char   buf[128];
1321                 size_t len = snprintf(buf, sizeof(buf), "%lld", v);
1322
1323                 tv = new_tarval_from_str(buf, len, mode);
1324                 break;
1325         }
1326
1327         default:
1328                 panic("invalid literal kind");
1329         }
1330
1331         dbg_info *dbgi       = get_dbg_info(&literal->base.source_position);
1332         ir_node  *res        = new_d_Const(dbgi, tv);
1333         ir_mode  *mode_arith = get_ir_mode_arithmetic(type);
1334         return create_conv(dbgi, res, mode_arith);
1335 }
1336
1337 /*
1338  * Allocate an area of size bytes aligned at alignment
1339  * at a frame type.
1340  */
1341 static ir_entity *alloc_trampoline(ir_type *frame_type, int size, unsigned alignment)
1342 {
1343         static unsigned area_cnt = 0;
1344         char buf[32];
1345
1346         ir_type *tp = new_type_array(1, ir_type_char);
1347         set_array_bounds_int(tp, 0, 0, size);
1348         set_type_alignment_bytes(tp, alignment);
1349
1350         snprintf(buf, sizeof(buf), "trampolin%u", area_cnt++);
1351         ident *name = new_id_from_str(buf);
1352         ir_entity *area = new_entity(frame_type, name, tp);
1353
1354         /* mark this entity as compiler generated */
1355         set_entity_compiler_generated(area, 1);
1356         return area;
1357 }
1358
1359 /**
1360  * Return a node representing a trampoline region
1361  * for a given function entity.
1362  *
1363  * @param dbgi    debug info
1364  * @param entity  the function entity
1365  */
1366 static ir_node *get_trampoline_region(dbg_info *dbgi, ir_entity *entity)
1367 {
1368         ir_entity *region = NULL;
1369         int        i;
1370
1371         if (current_trampolines != NULL) {
1372                 for (i = ARR_LEN(current_trampolines) - 1; i >= 0; --i) {
1373                         if (current_trampolines[i].function == entity) {
1374                                 region = current_trampolines[i].region;
1375                                 break;
1376                         }
1377                 }
1378         } else {
1379                 current_trampolines = NEW_ARR_F(trampoline_region, 0);
1380         }
1381         ir_graph *irg = current_ir_graph;
1382         if (region == NULL) {
1383                 /* create a new region */
1384                 ir_type           *frame_tp = get_irg_frame_type(irg);
1385                 trampoline_region  reg;
1386                 reg.function = entity;
1387
1388                 reg.region   = alloc_trampoline(frame_tp,
1389                                                 be_params->trampoline_size,
1390                                                 be_params->trampoline_align);
1391                 ARR_APP1(trampoline_region, current_trampolines, reg);
1392                 region = reg.region;
1393         }
1394         return new_d_simpleSel(dbgi, get_irg_no_mem(irg), get_irg_frame(irg),
1395                                region);
1396 }
1397
1398 /**
1399  * Creates a trampoline for a function represented by an entity.
1400  *
1401  * @param dbgi    debug info
1402  * @param mode    the (reference) mode for the function address
1403  * @param entity  the function entity
1404  */
1405 static ir_node *create_trampoline(dbg_info *dbgi, ir_mode *mode,
1406                                   ir_entity *entity)
1407 {
1408         assert(entity != NULL);
1409         ir_node *in[3];
1410         in[0] = get_trampoline_region(dbgi, entity);
1411         in[1] = create_symconst(dbgi, entity);
1412         in[2] = get_irg_frame(current_ir_graph);
1413
1414         ir_node *irn = new_d_Builtin(dbgi, get_store(), 3, in, ir_bk_inner_trampoline, get_unknown_type());
1415         set_store(new_Proj(irn, mode_M, pn_Builtin_M));
1416         return new_Proj(irn, mode, pn_Builtin_max+1);
1417 }
1418
1419 /**
1420  * Dereference an address.
1421  *
1422  * @param dbgi  debug info
1423  * @param type  the type of the dereferenced result (the points_to type)
1424  * @param addr  the address to dereference
1425  */
1426 static ir_node *deref_address(dbg_info *const dbgi, type_t *const type,
1427                                       ir_node *const addr)
1428 {
1429         type_t *skipped = skip_typeref(type);
1430         if (is_type_incomplete(skipped))
1431                 return addr;
1432
1433         ir_type *irtype = get_ir_type(skipped);
1434         if (is_compound_type(irtype)
1435             || is_Method_type(irtype)
1436             || is_Array_type(irtype)) {
1437                 return addr;
1438         }
1439
1440         ir_cons_flags  flags    = skipped->base.qualifiers & TYPE_QUALIFIER_VOLATILE
1441                                   ? cons_volatile : cons_none;
1442         ir_mode *const mode     = get_type_mode(irtype);
1443         ir_node *const memory   = get_store();
1444         ir_node *const load     = new_d_Load(dbgi, memory, addr, mode, flags);
1445         ir_node *const load_mem = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1446         ir_node *const load_res = new_d_Proj(dbgi, load, mode,   pn_Load_res);
1447
1448         set_store(load_mem);
1449
1450         ir_mode *const mode_arithmetic = get_ir_mode_arithmetic(skipped);
1451         return create_conv(dbgi, load_res, mode_arithmetic);
1452 }
1453
1454 /**
1455  * Returns the correct base address depending on whether it is a parameter or a
1456  * normal local variable.
1457  */
1458 static ir_node *get_local_frame(ir_entity *const ent)
1459 {
1460         ir_graph      *const irg   = current_ir_graph;
1461         const ir_type *const owner = get_entity_owner(ent);
1462         if (owner == current_outer_frame) {
1463                 assert(current_static_link != NULL);
1464                 return current_static_link;
1465         } else {
1466                 return get_irg_frame(irg);
1467         }
1468 }
1469
1470 /**
1471  * Keep all memory edges of the given block.
1472  */
1473 static void keep_all_memory(ir_node *block)
1474 {
1475         ir_node *old = get_cur_block();
1476
1477         set_cur_block(block);
1478         keep_alive(get_store());
1479         /* TODO: keep all memory edges from restricted pointers */
1480         set_cur_block(old);
1481 }
1482
1483 static ir_node *enum_constant_to_firm(reference_expression_t const *const ref)
1484 {
1485         entity_t *entity = ref->entity;
1486         if (entity->enum_value.tv == NULL) {
1487                 type_t *type = skip_typeref(entity->enum_value.enum_type);
1488                 assert(type->kind == TYPE_ENUM);
1489                 determine_enum_values(&type->enumt);
1490         }
1491
1492         return new_Const(entity->enum_value.tv);
1493 }
1494
1495 static ir_node *reference_addr(const reference_expression_t *ref)
1496 {
1497         dbg_info *dbgi   = get_dbg_info(&ref->base.source_position);
1498         entity_t *entity = ref->entity;
1499         assert(is_declaration(entity));
1500
1501         if (entity->kind == ENTITY_FUNCTION
1502             && entity->function.btk != BUILTIN_NONE) {
1503                 ir_entity *irentity = get_function_entity(entity, NULL);
1504                 /* for gcc compatibility we have to produce (dummy) addresses for some
1505                  * builtins which don't have entities */
1506                 if (irentity == NULL) {
1507                         source_position_t const *const pos = &ref->base.source_position;
1508                         warningf(WARN_OTHER, pos, "taking address of builtin '%N'", ref->entity);
1509
1510                         /* simply create a NULL pointer */
1511                         ir_mode  *mode = get_ir_mode_arithmetic(type_void_ptr);
1512                         ir_node  *res  = new_Const(get_mode_null(mode));
1513
1514                         return res;
1515                 }
1516         }
1517
1518         switch((declaration_kind_t) entity->declaration.kind) {
1519         case DECLARATION_KIND_UNKNOWN:
1520                 break;
1521         case DECLARATION_KIND_PARAMETER:
1522         case DECLARATION_KIND_LOCAL_VARIABLE:
1523                 /* you can store to a local variable (so we don't panic but return NULL
1524                  * as an indicator for no real address) */
1525                 return NULL;
1526         case DECLARATION_KIND_GLOBAL_VARIABLE: {
1527                 ir_node *const addr = create_symconst(dbgi, entity->variable.v.entity);
1528                 return addr;
1529         }
1530
1531         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY:
1532         case DECLARATION_KIND_PARAMETER_ENTITY: {
1533                 ir_entity *irentity = entity->variable.v.entity;
1534                 ir_node   *frame    = get_local_frame(irentity);
1535                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1536                 return sel;
1537         }
1538
1539         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
1540                 return entity->variable.v.vla_base;
1541
1542         case DECLARATION_KIND_FUNCTION: {
1543                 return create_symconst(dbgi, entity->function.irentity);
1544         }
1545
1546         case DECLARATION_KIND_INNER_FUNCTION: {
1547                 type_t  *const type = skip_typeref(entity->declaration.type);
1548                 ir_mode *const mode = get_ir_mode_storage(type);
1549                 if (!entity->function.goto_to_outer && !entity->function.need_closure) {
1550                         /* inner function not using the closure */
1551                         return create_symconst(dbgi, entity->function.irentity);
1552                 } else {
1553                         /* need trampoline here */
1554                         return create_trampoline(dbgi, mode, entity->function.irentity);
1555                 }
1556         }
1557
1558         case DECLARATION_KIND_COMPOUND_MEMBER:
1559                 panic("not implemented reference type");
1560         }
1561
1562         panic("reference to declaration with unknown type");
1563 }
1564
1565 static ir_node *reference_expression_to_firm(const reference_expression_t *ref)
1566 {
1567         dbg_info *const dbgi   = get_dbg_info(&ref->base.source_position);
1568         entity_t *const entity = ref->entity;
1569         assert(is_declaration(entity));
1570
1571         switch ((declaration_kind_t)entity->declaration.kind) {
1572         case DECLARATION_KIND_LOCAL_VARIABLE:
1573         case DECLARATION_KIND_PARAMETER: {
1574                 type_t  *const type  = skip_typeref(entity->declaration.type);
1575                 ir_mode *const mode  = get_ir_mode_storage(type);
1576                 ir_node *const value = get_value(entity->variable.v.value_number, mode);
1577                 return create_conv(dbgi, value, get_ir_mode_arithmetic(type));
1578         }
1579
1580         default: {
1581                 ir_node *const addr = reference_addr(ref);
1582                 return deref_address(dbgi, entity->declaration.type, addr);
1583         }
1584         }
1585 }
1586
1587 /**
1588  * Transform calls to builtin functions.
1589  */
1590 static ir_node *process_builtin_call(const call_expression_t *call)
1591 {
1592         dbg_info *dbgi = get_dbg_info(&call->base.source_position);
1593
1594         assert(call->function->kind == EXPR_REFERENCE);
1595         reference_expression_t *builtin = &call->function->reference;
1596
1597         type_t *expr_type = skip_typeref(builtin->base.type);
1598         assert(is_type_pointer(expr_type));
1599
1600         type_t *function_type = skip_typeref(expr_type->pointer.points_to);
1601
1602         switch (builtin->entity->function.btk) {
1603         case BUILTIN_NONE:
1604                 break;
1605         case BUILTIN_ALLOCA: {
1606                 expression_t *argument = call->arguments->expression;
1607                 ir_node      *size     = expression_to_firm(argument);
1608
1609                 ir_node *store  = get_store();
1610                 ir_node *alloca = new_d_Alloc(dbgi, store, size, get_unknown_type(),
1611                                               stack_alloc);
1612                 ir_node *proj_m = new_Proj(alloca, mode_M, pn_Alloc_M);
1613                 set_store(proj_m);
1614                 ir_node *res    = new_Proj(alloca, mode_P_data, pn_Alloc_res);
1615
1616                 return res;
1617         }
1618         case BUILTIN_INF: {
1619                 type_t    *type = function_type->function.return_type;
1620                 ir_mode   *mode = get_ir_mode_arithmetic(type);
1621                 ir_tarval *tv   = get_mode_infinite(mode);
1622                 ir_node   *res  = new_d_Const(dbgi, tv);
1623                 return res;
1624         }
1625         case BUILTIN_NAN: {
1626                 /* Ignore string for now... */
1627                 assert(is_type_function(function_type));
1628                 type_t    *type = function_type->function.return_type;
1629                 ir_mode   *mode = get_ir_mode_arithmetic(type);
1630                 ir_tarval *tv   = get_mode_NAN(mode);
1631                 ir_node   *res  = new_d_Const(dbgi, tv);
1632                 return res;
1633         }
1634         case BUILTIN_EXPECT: {
1635                 expression_t *argument = call->arguments->expression;
1636                 return _expression_to_firm(argument);
1637         }
1638         case BUILTIN_VA_END:
1639                 /* evaluate the argument of va_end for its side effects */
1640                 _expression_to_firm(call->arguments->expression);
1641                 return NULL;
1642         case BUILTIN_OBJECT_SIZE: {
1643                 /* determine value of "type" */
1644                 expression_t *type_expression = call->arguments->next->expression;
1645                 long          type_val        = fold_constant_to_int(type_expression);
1646                 type_t       *type            = function_type->function.return_type;
1647                 ir_mode      *mode            = get_ir_mode_arithmetic(type);
1648                 /* just produce a "I don't know" result */
1649                 ir_tarval    *result          = type_val & 2 ? get_mode_null(mode) :
1650                                                 get_mode_minus_one(mode);
1651
1652                 return new_d_Const(dbgi, result);
1653         }
1654         case BUILTIN_ROTL: {
1655                 ir_node *val  = expression_to_firm(call->arguments->expression);
1656                 ir_node *shf  = expression_to_firm(call->arguments->next->expression);
1657                 ir_mode *mode = get_irn_mode(val);
1658                 ir_mode *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1659                 return new_d_Rotl(dbgi, val, create_conv(dbgi, shf, mode_uint), mode);
1660         }
1661         case BUILTIN_ROTR: {
1662                 ir_node *val  = expression_to_firm(call->arguments->expression);
1663                 ir_node *shf  = expression_to_firm(call->arguments->next->expression);
1664                 ir_mode *mode = get_irn_mode(val);
1665                 ir_mode *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1666                 ir_node *c    = new_Const_long(mode_uint, get_mode_size_bits(mode));
1667                 ir_node *sub  = new_d_Sub(dbgi, c, create_conv(dbgi, shf, mode_uint), mode_uint);
1668                 return new_d_Rotl(dbgi, val, sub, mode);
1669         }
1670         case BUILTIN_FIRM:
1671                 break;
1672         case BUILTIN_LIBC:
1673         case BUILTIN_LIBC_CHECK:
1674                 panic("builtin did not produce an entity");
1675         }
1676         panic("invalid builtin");
1677 }
1678
1679 /**
1680  * Transform a call expression.
1681  * Handles some special cases, like alloca() calls, which must be resolved
1682  * BEFORE the inlines runs. Inlining routines calling alloca() is dangerous,
1683  * 176.gcc for instance might allocate 2GB instead of 256 MB if alloca is not
1684  * handled right...
1685  */
1686 static ir_node *call_expression_to_firm(const call_expression_t *const call)
1687 {
1688         dbg_info *const dbgi = get_dbg_info(&call->base.source_position);
1689         assert(currently_reachable());
1690
1691         expression_t   *function = call->function;
1692         ir_node        *callee   = NULL;
1693         bool            firm_builtin = false;
1694         ir_builtin_kind firm_builtin_kind = ir_bk_trap;
1695         if (function->kind == EXPR_REFERENCE) {
1696                 const reference_expression_t *ref    = &function->reference;
1697                 entity_t                     *entity = ref->entity;
1698
1699                 if (entity->kind == ENTITY_FUNCTION) {
1700                         builtin_kind_t builtin = entity->function.btk;
1701                         if (builtin == BUILTIN_FIRM) {
1702                                 firm_builtin = true;
1703                                 firm_builtin_kind = entity->function.b.firm_builtin_kind;
1704                         } else if (builtin != BUILTIN_NONE && builtin != BUILTIN_LIBC
1705                                    && builtin != BUILTIN_LIBC_CHECK) {
1706                                 return process_builtin_call(call);
1707                         }
1708                 }
1709         }
1710         if (!firm_builtin)
1711                 callee = expression_to_firm(function);
1712
1713         type_t *type = skip_typeref(function->base.type);
1714         assert(is_type_pointer(type));
1715         pointer_type_t *pointer_type = &type->pointer;
1716         type_t         *points_to    = skip_typeref(pointer_type->points_to);
1717         assert(is_type_function(points_to));
1718         function_type_t *function_type = &points_to->function;
1719
1720         int      n_parameters    = 0;
1721         ir_type *ir_method_type  = get_ir_type((type_t*) function_type);
1722         ir_type *new_method_type = NULL;
1723         if (function_type->variadic || function_type->unspecified_parameters) {
1724                 const call_argument_t *argument = call->arguments;
1725                 for ( ; argument != NULL; argument = argument->next) {
1726                         ++n_parameters;
1727                 }
1728
1729                 /* we need to construct a new method type matching the call
1730                  * arguments... */
1731                 type_dbg_info *tdbgi = get_type_dbg_info_((const type_t*) function_type);
1732                 int n_res       = get_method_n_ress(ir_method_type);
1733                 new_method_type = new_d_type_method(n_parameters, n_res, tdbgi);
1734                 set_method_calling_convention(new_method_type,
1735                                get_method_calling_convention(ir_method_type));
1736                 set_method_additional_properties(new_method_type,
1737                                get_method_additional_properties(ir_method_type));
1738                 set_method_variadicity(new_method_type,
1739                                        get_method_variadicity(ir_method_type));
1740
1741                 for (int i = 0; i < n_res; ++i) {
1742                         set_method_res_type(new_method_type, i,
1743                                             get_method_res_type(ir_method_type, i));
1744                 }
1745                 argument = call->arguments;
1746                 for (int i = 0; i < n_parameters; ++i, argument = argument->next) {
1747                         expression_t *expression = argument->expression;
1748                         ir_type      *irtype     = get_ir_type(expression->base.type);
1749                         set_method_param_type(new_method_type, i, irtype);
1750                 }
1751                 ir_method_type = new_method_type;
1752         } else {
1753                 n_parameters = get_method_n_params(ir_method_type);
1754         }
1755
1756         ir_node *in[n_parameters];
1757
1758         const call_argument_t *argument = call->arguments;
1759         for (int n = 0; n < n_parameters; ++n) {
1760                 expression_t *expression = argument->expression;
1761                 ir_node      *arg_node   = expression_to_firm(expression);
1762
1763                 type_t *arg_type = skip_typeref(expression->base.type);
1764                 if (!is_type_compound(arg_type)) {
1765                         ir_mode *const mode = get_ir_mode_storage(arg_type);
1766                         arg_node = create_conv(dbgi, arg_node, mode);
1767                 }
1768
1769                 in[n] = arg_node;
1770
1771                 argument = argument->next;
1772         }
1773
1774         ir_node *store;
1775         if (function_type->modifiers & DM_CONST) {
1776                 store = get_irg_no_mem(current_ir_graph);
1777         } else {
1778                 store = get_store();
1779         }
1780
1781         ir_node *node;
1782         type_t  *return_type = skip_typeref(function_type->return_type);
1783         ir_node *result      = NULL;
1784         if (firm_builtin) {
1785                 node = new_d_Builtin(dbgi, store, n_parameters, in, firm_builtin_kind,
1786                                      ir_method_type);
1787                 if (! (function_type->modifiers & DM_CONST)) {
1788                         ir_node *mem = new_Proj(node, mode_M, pn_Builtin_M);
1789                         set_store(mem);
1790                 }
1791
1792                 if (!is_type_void(return_type)) {
1793                         assert(is_type_scalar(return_type));
1794                         ir_mode *mode = get_ir_mode_storage(return_type);
1795                         result = new_Proj(node, mode, pn_Builtin_max+1);
1796                         ir_mode *mode_arith = get_ir_mode_arithmetic(return_type);
1797                         result              = create_conv(NULL, result, mode_arith);
1798                 }
1799         } else {
1800                 node = new_d_Call(dbgi, store, callee, n_parameters, in, ir_method_type);
1801                 if (! (function_type->modifiers & DM_CONST)) {
1802                         ir_node *mem = new_Proj(node, mode_M, pn_Call_M);
1803                         set_store(mem);
1804                 }
1805
1806                 if (!is_type_void(return_type)) {
1807                         ir_node *const resproj    = new_Proj(node, mode_T, pn_Call_T_result);
1808                         ir_mode *const mode       = get_ir_mode_storage(return_type);
1809                         result                    = new_Proj(resproj, mode, 0);
1810                         ir_mode *const mode_arith = get_ir_mode_arithmetic(return_type);
1811                         result                    = create_conv(NULL, result, mode_arith);
1812                 }
1813         }
1814
1815         if (function_type->modifiers & DM_NORETURN) {
1816                 /* A dead end:  Keep the Call and the Block.  Also place all further
1817                  * nodes into a new and unreachable block. */
1818                 keep_alive(node);
1819                 keep_alive(get_cur_block());
1820                 ir_node *block = new_Block(0, NULL);
1821                 set_cur_block(block);
1822         }
1823
1824         return result;
1825 }
1826
1827 static ir_node *statement_to_firm(statement_t *statement);
1828 static ir_node *compound_statement_to_firm(compound_statement_t *compound);
1829
1830 static ir_node *expression_to_addr(const expression_t *expression);
1831 static ir_node *create_condition_evaluation(expression_t const *expression, jump_target *true_target, jump_target *false_target);
1832
1833 static void assign_value(dbg_info *dbgi, ir_node *addr, type_t *type,
1834                          ir_node *value)
1835 {
1836         if (!is_type_compound(type)) {
1837                 ir_mode *mode = get_ir_mode_storage(type);
1838                 value         = create_conv(dbgi, value, mode);
1839         }
1840
1841         ir_node *memory = get_store();
1842
1843         if (is_type_scalar(type)) {
1844                 ir_cons_flags flags = type->base.qualifiers & TYPE_QUALIFIER_VOLATILE
1845                                       ? cons_volatile : cons_none;
1846                 ir_node  *store     = new_d_Store(dbgi, memory, addr, value, flags);
1847                 ir_node  *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
1848                 set_store(store_mem);
1849         } else {
1850                 ir_type *irtype    = get_ir_type(type);
1851                 ir_node *copyb     = new_d_CopyB(dbgi, memory, addr, value, irtype);
1852                 ir_node *copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
1853                 set_store(copyb_mem);
1854         }
1855 }
1856
1857 static ir_tarval *create_bitfield_mask(ir_mode *mode, int offset, int size)
1858 {
1859         ir_tarval *all_one   = get_mode_all_one(mode);
1860         int        mode_size = get_mode_size_bits(mode);
1861         ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1862
1863         assert(offset >= 0);
1864         assert(size   >= 0);
1865         assert(offset + size <= mode_size);
1866         if (size == mode_size) {
1867                 return all_one;
1868         }
1869
1870         long       shiftr    = get_mode_size_bits(mode) - size;
1871         long       shiftl    = offset;
1872         ir_tarval *tv_shiftr = new_tarval_from_long(shiftr, mode_uint);
1873         ir_tarval *tv_shiftl = new_tarval_from_long(shiftl, mode_uint);
1874         ir_tarval *mask0     = tarval_shr(all_one, tv_shiftr);
1875         ir_tarval *mask1     = tarval_shl(mask0, tv_shiftl);
1876
1877         return mask1;
1878 }
1879
1880 static ir_node *bitfield_store_to_firm(dbg_info *dbgi,
1881                 ir_entity *entity, ir_node *addr, ir_node *value, bool set_volatile,
1882                 bool need_return)
1883 {
1884         ir_type *entity_type = get_entity_type(entity);
1885         ir_type *base_type   = get_primitive_base_type(entity_type);
1886         ir_mode *mode        = get_type_mode(base_type);
1887         ir_mode *mode_uint   = atomic_modes[ATOMIC_TYPE_UINT];
1888
1889         value = create_conv(dbgi, value, mode);
1890
1891         /* kill upper bits of value and shift to right position */
1892         unsigned  bitoffset  = get_entity_offset_bits_remainder(entity);
1893         unsigned  bitsize    = get_mode_size_bits(get_type_mode(entity_type));
1894         unsigned  base_bits  = get_mode_size_bits(mode);
1895         unsigned  shiftwidth = base_bits - bitsize;
1896
1897         ir_node  *shiftcount = new_Const_long(mode_uint, shiftwidth);
1898         ir_node  *shiftl     = new_d_Shl(dbgi, value, shiftcount, mode);
1899
1900         unsigned  shrwidth   = base_bits - bitsize - bitoffset;
1901         ir_node  *shrconst   = new_Const_long(mode_uint, shrwidth);
1902         ir_node  *shiftr     = new_d_Shr(dbgi, shiftl, shrconst, mode);
1903
1904         /* load current value */
1905         ir_node   *mem             = get_store();
1906         ir_node   *load            = new_d_Load(dbgi, mem, addr, mode,
1907                                           set_volatile ? cons_volatile : cons_none);
1908         ir_node   *load_mem        = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1909         ir_node   *load_res        = new_d_Proj(dbgi, load, mode, pn_Load_res);
1910         ir_tarval *shift_mask      = create_bitfield_mask(mode, bitoffset, bitsize);
1911         ir_tarval *inv_mask        = tarval_not(shift_mask);
1912         ir_node   *inv_mask_node   = new_d_Const(dbgi, inv_mask);
1913         ir_node   *load_res_masked = new_d_And(dbgi, load_res, inv_mask_node, mode);
1914
1915         /* construct new value and store */
1916         ir_node *new_val   = new_d_Or(dbgi, load_res_masked, shiftr, mode);
1917         ir_node *store     = new_d_Store(dbgi, load_mem, addr, new_val,
1918                                          set_volatile ? cons_volatile : cons_none);
1919         ir_node *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
1920         set_store(store_mem);
1921
1922         if (!need_return)
1923                 return NULL;
1924
1925         ir_node *res_shr;
1926         ir_node *count_res_shr = new_Const_long(mode_uint, base_bits - bitsize);
1927         if (mode_is_signed(mode)) {
1928                 res_shr = new_d_Shrs(dbgi, shiftl, count_res_shr, mode);
1929         } else {
1930                 res_shr = new_d_Shr(dbgi, shiftl, count_res_shr, mode);
1931         }
1932         return res_shr;
1933 }
1934
1935 static ir_node *bitfield_extract_to_firm(const select_expression_t *expression,
1936                                          ir_node *addr)
1937 {
1938         dbg_info *dbgi      = get_dbg_info(&expression->base.source_position);
1939         entity_t *entity    = expression->compound_entry;
1940         type_t   *base_type = entity->declaration.type;
1941         ir_mode  *mode      = get_ir_mode_storage(base_type);
1942         ir_node  *mem       = get_store();
1943         ir_node  *load      = new_d_Load(dbgi, mem, addr, mode, cons_none);
1944         ir_node  *load_mem  = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1945         ir_node  *load_res  = new_d_Proj(dbgi, load, mode, pn_Load_res);
1946         ir_mode  *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1947
1948         ir_mode  *amode     = mode;
1949         /* optimisation, since shifting in modes < machine_size is usually
1950          * less efficient */
1951         if (get_mode_size_bits(amode) < get_mode_size_bits(mode_uint)) {
1952                 amode = mode_uint;
1953         }
1954         unsigned amode_size = get_mode_size_bits(amode);
1955         load_res = create_conv(dbgi, load_res, amode);
1956
1957         set_store(load_mem);
1958
1959         /* kill upper bits */
1960         assert(expression->compound_entry->kind == ENTITY_COMPOUND_MEMBER);
1961         unsigned   bitoffset   = entity->compound_member.bit_offset;
1962         unsigned   bitsize     = entity->compound_member.bit_size;
1963         unsigned   shift_bitsl = amode_size - bitoffset - bitsize;
1964         ir_tarval *tvl         = new_tarval_from_long((long)shift_bitsl, mode_uint);
1965         ir_node   *countl      = new_d_Const(dbgi, tvl);
1966         ir_node   *shiftl      = new_d_Shl(dbgi, load_res, countl, amode);
1967
1968         unsigned   shift_bitsr = bitoffset + shift_bitsl;
1969         assert(shift_bitsr <= amode_size);
1970         ir_tarval *tvr         = new_tarval_from_long((long)shift_bitsr, mode_uint);
1971         ir_node   *countr      = new_d_Const(dbgi, tvr);
1972         ir_node   *shiftr;
1973         if (mode_is_signed(mode)) {
1974                 shiftr = new_d_Shrs(dbgi, shiftl, countr, amode);
1975         } else {
1976                 shiftr = new_d_Shr(dbgi, shiftl, countr, amode);
1977         }
1978
1979         type_t  *type    = expression->base.type;
1980         ir_mode *resmode = get_ir_mode_arithmetic(type);
1981         return create_conv(dbgi, shiftr, resmode);
1982 }
1983
1984 /* make sure the selected compound type is constructed */
1985 static void construct_select_compound(const select_expression_t *expression)
1986 {
1987         type_t *type = skip_typeref(expression->compound->base.type);
1988         if (is_type_pointer(type)) {
1989                 type = type->pointer.points_to;
1990         }
1991         (void) get_ir_type(type);
1992 }
1993
1994 static ir_node *set_value_for_expression_addr(const expression_t *expression,
1995                                               ir_node *value, ir_node *addr)
1996 {
1997         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
1998         type_t   *type = skip_typeref(expression->base.type);
1999
2000         if (!is_type_compound(type)) {
2001                 ir_mode  *mode = get_ir_mode_storage(type);
2002                 value          = create_conv(dbgi, value, mode);
2003         }
2004
2005         if (expression->kind == EXPR_REFERENCE) {
2006                 const reference_expression_t *ref = &expression->reference;
2007
2008                 entity_t *entity = ref->entity;
2009                 assert(is_declaration(entity));
2010                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2011                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE ||
2012                     entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
2013                         set_value(entity->variable.v.value_number, value);
2014                         return value;
2015                 }
2016         }
2017
2018         if (addr == NULL)
2019                 addr = expression_to_addr(expression);
2020         assert(addr != NULL);
2021
2022         if (expression->kind == EXPR_SELECT) {
2023                 const select_expression_t *select = &expression->select;
2024
2025                 construct_select_compound(select);
2026
2027                 entity_t *entity = select->compound_entry;
2028                 assert(entity->kind == ENTITY_COMPOUND_MEMBER);
2029                 if (entity->compound_member.bitfield) {
2030                         ir_entity *irentity = entity->compound_member.entity;
2031                         bool       set_volatile
2032                                 = select->base.type->base.qualifiers & TYPE_QUALIFIER_VOLATILE;
2033                         value = bitfield_store_to_firm(dbgi, irentity, addr, value,
2034                                                        set_volatile, true);
2035                         return value;
2036                 }
2037         }
2038
2039         assign_value(dbgi, addr, type, value);
2040         return value;
2041 }
2042
2043 static void set_value_for_expression(const expression_t *expression,
2044                                      ir_node *value)
2045 {
2046         set_value_for_expression_addr(expression, value, NULL);
2047 }
2048
2049 static ir_node *get_value_from_lvalue(const expression_t *expression,
2050                                       ir_node *addr)
2051 {
2052         if (expression->kind == EXPR_REFERENCE) {
2053                 const reference_expression_t *ref = &expression->reference;
2054
2055                 entity_t *entity = ref->entity;
2056                 assert(entity->kind == ENTITY_VARIABLE
2057                                 || entity->kind == ENTITY_PARAMETER);
2058                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2059                 int value_number;
2060                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE ||
2061                     entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
2062                         value_number = entity->variable.v.value_number;
2063                         assert(addr == NULL);
2064                         type_t  *type = skip_typeref(expression->base.type);
2065                         ir_mode *mode = get_ir_mode_storage(type);
2066                         ir_node *res  = get_value(value_number, mode);
2067                         return create_conv(NULL, res, get_ir_mode_arithmetic(type));
2068                 }
2069         }
2070
2071         assert(addr != NULL);
2072         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2073
2074         ir_node *value;
2075         if (expression->kind == EXPR_SELECT &&
2076             expression->select.compound_entry->compound_member.bitfield) {
2077             construct_select_compound(&expression->select);
2078                 value = bitfield_extract_to_firm(&expression->select, addr);
2079         } else {
2080                 value = deref_address(dbgi, expression->base.type, addr);
2081         }
2082
2083         return value;
2084 }
2085
2086
2087 static ir_node *create_incdec(const unary_expression_t *expression)
2088 {
2089         dbg_info *const     dbgi = get_dbg_info(&expression->base.source_position);
2090         const expression_t *value_expr = expression->value;
2091         ir_node            *addr       = expression_to_addr(value_expr);
2092         ir_node            *value      = get_value_from_lvalue(value_expr, addr);
2093
2094         type_t  *type = skip_typeref(expression->base.type);
2095         ir_mode *mode = get_ir_mode_arithmetic(expression->base.type);
2096
2097         ir_node *offset;
2098         if (is_type_pointer(type)) {
2099                 pointer_type_t *pointer_type = &type->pointer;
2100                 offset = get_type_size_node(pointer_type->points_to);
2101         } else {
2102                 assert(is_type_arithmetic(type));
2103                 offset = new_Const(get_mode_one(mode));
2104         }
2105
2106         ir_node *result;
2107         ir_node *store_value;
2108         switch(expression->base.kind) {
2109         case EXPR_UNARY_POSTFIX_INCREMENT:
2110                 result      = value;
2111                 store_value = new_d_Add(dbgi, value, offset, mode);
2112                 break;
2113         case EXPR_UNARY_POSTFIX_DECREMENT:
2114                 result      = value;
2115                 store_value = new_d_Sub(dbgi, value, offset, mode);
2116                 break;
2117         case EXPR_UNARY_PREFIX_INCREMENT:
2118                 result      = new_d_Add(dbgi, value, offset, mode);
2119                 store_value = result;
2120                 break;
2121         case EXPR_UNARY_PREFIX_DECREMENT:
2122                 result      = new_d_Sub(dbgi, value, offset, mode);
2123                 store_value = result;
2124                 break;
2125         default:
2126                 panic("no incdec expr");
2127         }
2128
2129         set_value_for_expression_addr(value_expr, store_value, addr);
2130
2131         return result;
2132 }
2133
2134 static bool is_local_variable(expression_t *expression)
2135 {
2136         if (expression->kind != EXPR_REFERENCE)
2137                 return false;
2138         reference_expression_t *ref_expr = &expression->reference;
2139         entity_t               *entity   = ref_expr->entity;
2140         if (entity->kind != ENTITY_VARIABLE)
2141                 return false;
2142         assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2143         return entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE;
2144 }
2145
2146 static ir_relation get_relation(const expression_kind_t kind)
2147 {
2148         switch(kind) {
2149         case EXPR_BINARY_EQUAL:         return ir_relation_equal;
2150         case EXPR_BINARY_ISLESSGREATER: return ir_relation_less_greater;
2151         case EXPR_BINARY_NOTEQUAL:      return ir_relation_unordered_less_greater;
2152         case EXPR_BINARY_ISLESS:
2153         case EXPR_BINARY_LESS:          return ir_relation_less;
2154         case EXPR_BINARY_ISLESSEQUAL:
2155         case EXPR_BINARY_LESSEQUAL:     return ir_relation_less_equal;
2156         case EXPR_BINARY_ISGREATER:
2157         case EXPR_BINARY_GREATER:       return ir_relation_greater;
2158         case EXPR_BINARY_ISGREATEREQUAL:
2159         case EXPR_BINARY_GREATEREQUAL:  return ir_relation_greater_equal;
2160         case EXPR_BINARY_ISUNORDERED:   return ir_relation_unordered;
2161
2162         default:
2163                 break;
2164         }
2165         panic("trying to get ir_relation from non-comparison binexpr type");
2166 }
2167
2168 /**
2169  * Handle the assume optimizer hint: check if a Confirm
2170  * node can be created.
2171  *
2172  * @param dbi    debug info
2173  * @param expr   the IL assume expression
2174  *
2175  * we support here only some simple cases:
2176  *  - var rel const
2177  *  - const rel val
2178  *  - var rel var
2179  */
2180 static ir_node *handle_assume_compare(dbg_info *dbi,
2181                                       const binary_expression_t *expression)
2182 {
2183         expression_t *op1 = expression->left;
2184         expression_t *op2 = expression->right;
2185         entity_t     *var2, *var = NULL;
2186         ir_node      *res      = NULL;
2187         ir_relation   relation = get_relation(expression->base.kind);
2188
2189         if (is_local_variable(op1) && is_local_variable(op2)) {
2190                 var  = op1->reference.entity;
2191             var2 = op2->reference.entity;
2192
2193                 type_t  *const type = skip_typeref(var->declaration.type);
2194                 ir_mode *const mode = get_ir_mode_storage(type);
2195
2196                 ir_node *const irn1 = get_value(var->variable.v.value_number, mode);
2197                 ir_node *const irn2 = get_value(var2->variable.v.value_number, mode);
2198
2199                 res = new_d_Confirm(dbi, irn2, irn1, get_inversed_relation(relation));
2200                 set_value(var2->variable.v.value_number, res);
2201
2202                 res = new_d_Confirm(dbi, irn1, irn2, relation);
2203                 set_value(var->variable.v.value_number, res);
2204
2205                 return res;
2206         }
2207
2208         expression_t *con = NULL;
2209         if (is_local_variable(op1) && is_constant_expression(op2) == EXPR_CLASS_CONSTANT) {
2210                 var = op1->reference.entity;
2211                 con = op2;
2212         } else if (is_constant_expression(op1) == EXPR_CLASS_CONSTANT && is_local_variable(op2)) {
2213                 relation = get_inversed_relation(relation);
2214                 var = op2->reference.entity;
2215                 con = op1;
2216         }
2217
2218         if (var != NULL) {
2219                 type_t  *const type = skip_typeref(var->declaration.type);
2220                 ir_mode *const mode = get_ir_mode_storage(type);
2221
2222                 res = get_value(var->variable.v.value_number, mode);
2223                 res = new_d_Confirm(dbi, res, expression_to_firm(con), relation);
2224                 set_value(var->variable.v.value_number, res);
2225         }
2226         return res;
2227 }
2228
2229 /**
2230  * Handle the assume optimizer hint.
2231  *
2232  * @param dbi    debug info
2233  * @param expr   the IL assume expression
2234  */
2235 static ir_node *handle_assume(dbg_info *dbi, const expression_t *expression)
2236 {
2237         switch(expression->kind) {
2238         case EXPR_BINARY_EQUAL:
2239         case EXPR_BINARY_NOTEQUAL:
2240         case EXPR_BINARY_LESS:
2241         case EXPR_BINARY_LESSEQUAL:
2242         case EXPR_BINARY_GREATER:
2243         case EXPR_BINARY_GREATEREQUAL:
2244                 return handle_assume_compare(dbi, &expression->binary);
2245         default:
2246                 return NULL;
2247         }
2248 }
2249
2250 static ir_node *create_cast(dbg_info *dbgi, ir_node *value_node,
2251                             type_t *from_type, type_t *type)
2252 {
2253         type = skip_typeref(type);
2254         if (is_type_void(type)) {
2255                 /* make sure firm type is constructed */
2256                 (void) get_ir_type(type);
2257                 return NULL;
2258         }
2259         if (!is_type_scalar(type)) {
2260                 /* make sure firm type is constructed */
2261                 (void) get_ir_type(type);
2262                 return value_node;
2263         }
2264
2265         from_type     = skip_typeref(from_type);
2266         ir_mode *mode = get_ir_mode_storage(type);
2267         /* check for conversion from / to __based types */
2268         if (is_type_pointer(type) && is_type_pointer(from_type)) {
2269                 const variable_t *from_var = from_type->pointer.base_variable;
2270                 const variable_t *to_var   = type->pointer.base_variable;
2271                 if (from_var != to_var) {
2272                         if (from_var != NULL) {
2273                                 ir_node *const addr = create_symconst(dbgi, from_var->v.entity);
2274                                 ir_node *const base = deref_address(dbgi, from_var->base.type, addr);
2275                                 value_node = new_d_Add(dbgi, value_node, base, mode);
2276                         }
2277                         if (to_var != NULL) {
2278                                 ir_node *const addr = create_symconst(dbgi, to_var->v.entity);
2279                                 ir_node *const base = deref_address(dbgi, to_var->base.type, addr);
2280                                 value_node = new_d_Sub(dbgi, value_node, base, mode);
2281                         }
2282                 }
2283         }
2284
2285         if (is_type_atomic(type, ATOMIC_TYPE_BOOL)) {
2286                 /* bool adjustments (we save a mode_Bu, but have to temporarily
2287                  * convert to mode_b so we only get a 0/1 value */
2288                 value_node = create_conv(dbgi, value_node, mode_b);
2289         }
2290
2291         ir_mode *mode_arith = get_ir_mode_arithmetic(type);
2292         ir_node *node       = create_conv(dbgi, value_node, mode);
2293         node                = create_conv(dbgi, node, mode_arith);
2294
2295         return node;
2296 }
2297
2298 static ir_node *unary_expression_to_firm(const unary_expression_t *expression)
2299 {
2300         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2301         type_t   *type = skip_typeref(expression->base.type);
2302
2303         const expression_t *value = expression->value;
2304
2305         switch(expression->base.kind) {
2306         case EXPR_UNARY_TAKE_ADDRESS:
2307                 return expression_to_addr(value);
2308
2309         case EXPR_UNARY_NEGATE: {
2310                 ir_node *value_node = expression_to_firm(value);
2311                 ir_mode *mode       = get_ir_mode_arithmetic(type);
2312                 return new_d_Minus(dbgi, value_node, mode);
2313         }
2314         case EXPR_UNARY_PLUS:
2315                 return expression_to_firm(value);
2316         case EXPR_UNARY_BITWISE_NEGATE: {
2317                 ir_node *value_node = expression_to_firm(value);
2318                 ir_mode *mode       = get_ir_mode_arithmetic(type);
2319                 return new_d_Not(dbgi, value_node, mode);
2320         }
2321         case EXPR_UNARY_NOT: {
2322                 ir_node *value_node = _expression_to_firm(value);
2323                 value_node          = create_conv(dbgi, value_node, mode_b);
2324                 ir_node *res        = new_d_Not(dbgi, value_node, mode_b);
2325                 return res;
2326         }
2327         case EXPR_UNARY_DEREFERENCE: {
2328                 ir_node *value_node = expression_to_firm(value);
2329                 type_t  *value_type = skip_typeref(value->base.type);
2330                 assert(is_type_pointer(value_type));
2331
2332                 /* check for __based */
2333                 const variable_t *const base_var = value_type->pointer.base_variable;
2334                 if (base_var != NULL) {
2335                         ir_node *const addr = create_symconst(dbgi, base_var->v.entity);
2336                         ir_node *const base = deref_address(dbgi, base_var->base.type, addr);
2337                         value_node = new_d_Add(dbgi, value_node, base, get_ir_mode_storage(value_type));
2338                 }
2339                 type_t  *points_to  = value_type->pointer.points_to;
2340                 return deref_address(dbgi, points_to, value_node);
2341         }
2342         case EXPR_UNARY_POSTFIX_INCREMENT:
2343         case EXPR_UNARY_POSTFIX_DECREMENT:
2344         case EXPR_UNARY_PREFIX_INCREMENT:
2345         case EXPR_UNARY_PREFIX_DECREMENT:
2346                 return create_incdec(expression);
2347         case EXPR_UNARY_CAST: {
2348                 ir_node *value_node = expression_to_firm(value);
2349                 type_t  *from_type  = value->base.type;
2350                 return create_cast(dbgi, value_node, from_type, type);
2351         }
2352         case EXPR_UNARY_ASSUME:
2353                 return handle_assume(dbgi, value);
2354
2355         default:
2356                 break;
2357         }
2358         panic("invalid unary expression type");
2359 }
2360
2361 /**
2362  * produces a 0/1 depending of the value of a mode_b node
2363  */
2364 static ir_node *produce_condition_result(const expression_t *expression,
2365                                          ir_mode *mode, dbg_info *dbgi)
2366 {
2367         jump_target true_target;
2368         jump_target false_target;
2369         init_jump_target(&true_target,  NULL);
2370         init_jump_target(&false_target, NULL);
2371         create_condition_evaluation(expression, &true_target, &false_target);
2372
2373         ir_node    *val = NULL;
2374         jump_target exit_target;
2375         init_jump_target(&exit_target, NULL);
2376
2377         if (enter_jump_target(&true_target)) {
2378                 val = new_Const(get_mode_one(mode));
2379                 jump_to_target(&exit_target);
2380         }
2381
2382         if (enter_jump_target(&false_target)) {
2383                 ir_node *const zero = new_Const(get_mode_null(mode));
2384                 jump_to_target(&exit_target);
2385                 if (val) {
2386                         ir_node *const in[] = { val, zero };
2387                         val = new_rd_Phi(dbgi, exit_target.block, lengthof(in), in, mode);
2388                 } else {
2389                         val = zero;
2390                 }
2391         }
2392
2393         if (!enter_jump_target(&exit_target)) {
2394                 set_cur_block(new_Block(0, NULL));
2395                 val = new_Unknown(mode);
2396         }
2397         return val;
2398 }
2399
2400 static ir_node *adjust_for_pointer_arithmetic(dbg_info *dbgi,
2401                 ir_node *value, type_t *type)
2402 {
2403         ir_mode        *const mode         = get_ir_mode_arithmetic(type_ptrdiff_t);
2404         assert(is_type_pointer(type));
2405         pointer_type_t *const pointer_type = &type->pointer;
2406         type_t         *const points_to    = skip_typeref(pointer_type->points_to);
2407         ir_node        *      elem_size    = get_type_size_node(points_to);
2408         elem_size                          = create_conv(dbgi, elem_size, mode);
2409         value                              = create_conv(dbgi, value,     mode);
2410         ir_node        *const mul          = new_d_Mul(dbgi, value, elem_size, mode);
2411         return mul;
2412 }
2413
2414 static ir_node *create_op(dbg_info *dbgi, const binary_expression_t *expression,
2415                           ir_node *left, ir_node *right)
2416 {
2417         ir_mode  *mode;
2418         type_t   *type_left  = skip_typeref(expression->left->base.type);
2419         type_t   *type_right = skip_typeref(expression->right->base.type);
2420
2421         expression_kind_t kind = expression->base.kind;
2422
2423         switch (kind) {
2424         case EXPR_BINARY_SHIFTLEFT:
2425         case EXPR_BINARY_SHIFTRIGHT:
2426         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2427         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2428                 mode  = get_ir_mode_arithmetic(expression->base.type);
2429                 right = create_conv(dbgi, right, atomic_modes[ATOMIC_TYPE_UINT]);
2430                 break;
2431
2432         case EXPR_BINARY_SUB:
2433                 if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
2434                         const pointer_type_t *const ptr_type = &type_left->pointer;
2435
2436                         mode = get_ir_mode_arithmetic(expression->base.type);
2437                         ir_node *const elem_size = get_type_size_node(ptr_type->points_to);
2438                         ir_node *const conv_size = new_d_Conv(dbgi, elem_size, mode);
2439                         ir_node *const sub       = new_d_Sub(dbgi, left, right, mode);
2440                         ir_node *const no_mem    = new_NoMem();
2441                         ir_node *const div       = new_d_DivRL(dbgi, no_mem, sub, conv_size,
2442                                                                                                    mode, op_pin_state_floats);
2443                         return new_d_Proj(dbgi, div, mode, pn_Div_res);
2444                 }
2445                 /* fallthrough */
2446         case EXPR_BINARY_SUB_ASSIGN:
2447                 if (is_type_pointer(type_left)) {
2448                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2449                         mode  = get_ir_mode_arithmetic(type_left);
2450                         break;
2451                 }
2452                 goto normal_node;
2453
2454         case EXPR_BINARY_ADD:
2455         case EXPR_BINARY_ADD_ASSIGN:
2456                 if (is_type_pointer(type_left)) {
2457                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2458                         mode  = get_ir_mode_arithmetic(type_left);
2459                         break;
2460                 } else if (is_type_pointer(type_right)) {
2461                         left  = adjust_for_pointer_arithmetic(dbgi, left, type_right);
2462                         mode  = get_ir_mode_arithmetic(type_right);
2463                         break;
2464                 }
2465                 goto normal_node;
2466
2467         default:
2468 normal_node:
2469                 mode = get_ir_mode_arithmetic(type_right);
2470                 left = create_conv(dbgi, left, mode);
2471                 break;
2472         }
2473
2474         switch (kind) {
2475         case EXPR_BINARY_ADD_ASSIGN:
2476         case EXPR_BINARY_ADD:
2477                 return new_d_Add(dbgi, left, right, mode);
2478         case EXPR_BINARY_SUB_ASSIGN:
2479         case EXPR_BINARY_SUB:
2480                 return new_d_Sub(dbgi, left, right, mode);
2481         case EXPR_BINARY_MUL_ASSIGN:
2482         case EXPR_BINARY_MUL:
2483                 return new_d_Mul(dbgi, left, right, mode);
2484         case EXPR_BINARY_BITWISE_AND:
2485         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2486                 return new_d_And(dbgi, left, right, mode);
2487         case EXPR_BINARY_BITWISE_OR:
2488         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2489                 return new_d_Or(dbgi, left, right, mode);
2490         case EXPR_BINARY_BITWISE_XOR:
2491         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2492                 return new_d_Eor(dbgi, left, right, mode);
2493         case EXPR_BINARY_SHIFTLEFT:
2494         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2495                 return new_d_Shl(dbgi, left, right, mode);
2496         case EXPR_BINARY_SHIFTRIGHT:
2497         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2498                 if (mode_is_signed(mode)) {
2499                         return new_d_Shrs(dbgi, left, right, mode);
2500                 } else {
2501                         return new_d_Shr(dbgi, left, right, mode);
2502                 }
2503         case EXPR_BINARY_DIV:
2504         case EXPR_BINARY_DIV_ASSIGN: {
2505                 ir_node *pin = new_Pin(new_NoMem());
2506                 ir_node *op  = new_d_Div(dbgi, pin, left, right, mode,
2507                                          op_pin_state_floats);
2508                 ir_node *res = new_d_Proj(dbgi, op, mode, pn_Div_res);
2509                 return res;
2510         }
2511         case EXPR_BINARY_MOD:
2512         case EXPR_BINARY_MOD_ASSIGN: {
2513                 ir_node *pin = new_Pin(new_NoMem());
2514                 ir_node *op  = new_d_Mod(dbgi, pin, left, right, mode,
2515                                          op_pin_state_floats);
2516                 ir_node *res = new_d_Proj(dbgi, op, mode, pn_Mod_res);
2517                 return res;
2518         }
2519         default:
2520                 panic("unexpected expression kind");
2521         }
2522 }
2523
2524 static ir_node *create_lazy_op(const binary_expression_t *expression)
2525 {
2526         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2527         type_t   *type = skip_typeref(expression->base.type);
2528         ir_mode  *mode = get_ir_mode_arithmetic(type);
2529
2530         if (is_constant_expression(expression->left) == EXPR_CLASS_CONSTANT) {
2531                 bool val = fold_constant_to_bool(expression->left);
2532                 expression_kind_t ekind = expression->base.kind;
2533                 assert(ekind == EXPR_BINARY_LOGICAL_AND || ekind == EXPR_BINARY_LOGICAL_OR);
2534                 if (ekind == EXPR_BINARY_LOGICAL_AND) {
2535                         if (!val) {
2536                                 return new_Const(get_mode_null(mode));
2537                         }
2538                 } else {
2539                         if (val) {
2540                                 return new_Const(get_mode_one(mode));
2541                         }
2542                 }
2543
2544                 if (is_constant_expression(expression->right) == EXPR_CLASS_CONSTANT) {
2545                         bool valr = fold_constant_to_bool(expression->right);
2546                         return create_Const_from_bool(mode, valr);
2547                 }
2548
2549                 return produce_condition_result(expression->right, mode, dbgi);
2550         }
2551
2552         return produce_condition_result((const expression_t*) expression, mode,
2553                                         dbgi);
2554 }
2555
2556 typedef ir_node * (*create_arithmetic_func)(dbg_info *dbgi, ir_node *left,
2557                                             ir_node *right, ir_mode *mode);
2558
2559 static ir_node *create_assign_binop(const binary_expression_t *expression)
2560 {
2561         dbg_info *const     dbgi = get_dbg_info(&expression->base.source_position);
2562         const expression_t *left_expr = expression->left;
2563         type_t             *type      = skip_typeref(left_expr->base.type);
2564         ir_node            *right     = expression_to_firm(expression->right);
2565         ir_node            *left_addr = expression_to_addr(left_expr);
2566         ir_node            *left      = get_value_from_lvalue(left_expr, left_addr);
2567         ir_node            *result    = create_op(dbgi, expression, left, right);
2568
2569         result = create_cast(dbgi, result, expression->right->base.type, type);
2570
2571         result = set_value_for_expression_addr(left_expr, result, left_addr);
2572
2573         if (!is_type_compound(type)) {
2574                 ir_mode *mode_arithmetic = get_ir_mode_arithmetic(type);
2575                 result = create_conv(dbgi, result, mode_arithmetic);
2576         }
2577         return result;
2578 }
2579
2580 static ir_node *binary_expression_to_firm(const binary_expression_t *expression)
2581 {
2582         expression_kind_t kind = expression->base.kind;
2583
2584         switch(kind) {
2585         case EXPR_BINARY_EQUAL:
2586         case EXPR_BINARY_NOTEQUAL:
2587         case EXPR_BINARY_LESS:
2588         case EXPR_BINARY_LESSEQUAL:
2589         case EXPR_BINARY_GREATER:
2590         case EXPR_BINARY_GREATEREQUAL:
2591         case EXPR_BINARY_ISGREATER:
2592         case EXPR_BINARY_ISGREATEREQUAL:
2593         case EXPR_BINARY_ISLESS:
2594         case EXPR_BINARY_ISLESSEQUAL:
2595         case EXPR_BINARY_ISLESSGREATER:
2596         case EXPR_BINARY_ISUNORDERED: {
2597                 dbg_info   *dbgi     = get_dbg_info(&expression->base.source_position);
2598                 ir_node    *left     = expression_to_firm(expression->left);
2599                 ir_node    *right    = expression_to_firm(expression->right);
2600                 ir_relation relation = get_relation(kind);
2601                 ir_node    *cmp      = new_d_Cmp(dbgi, left, right, relation);
2602                 return cmp;
2603         }
2604         case EXPR_BINARY_ASSIGN: {
2605                 ir_node *addr  = expression_to_addr(expression->left);
2606                 ir_node *right = expression_to_firm(expression->right);
2607                 ir_node *res
2608                         = set_value_for_expression_addr(expression->left, right, addr);
2609
2610                 type_t  *type            = skip_typeref(expression->base.type);
2611                 if (!is_type_compound(type)) {
2612                         ir_mode *mode_arithmetic = get_ir_mode_arithmetic(type);
2613                         res                      = create_conv(NULL, res, mode_arithmetic);
2614                 }
2615                 return res;
2616         }
2617         case EXPR_BINARY_ADD:
2618         case EXPR_BINARY_SUB:
2619         case EXPR_BINARY_MUL:
2620         case EXPR_BINARY_DIV:
2621         case EXPR_BINARY_MOD:
2622         case EXPR_BINARY_BITWISE_AND:
2623         case EXPR_BINARY_BITWISE_OR:
2624         case EXPR_BINARY_BITWISE_XOR:
2625         case EXPR_BINARY_SHIFTLEFT:
2626         case EXPR_BINARY_SHIFTRIGHT:
2627         {
2628                 dbg_info *dbgi  = get_dbg_info(&expression->base.source_position);
2629                 ir_node  *left  = expression_to_firm(expression->left);
2630                 ir_node  *right = expression_to_firm(expression->right);
2631                 return create_op(dbgi, expression, left, right);
2632         }
2633         case EXPR_BINARY_LOGICAL_AND:
2634         case EXPR_BINARY_LOGICAL_OR:
2635                 return create_lazy_op(expression);
2636         case EXPR_BINARY_COMMA:
2637                 /* create side effects of left side */
2638                 (void) expression_to_firm(expression->left);
2639                 return _expression_to_firm(expression->right);
2640
2641         case EXPR_BINARY_ADD_ASSIGN:
2642         case EXPR_BINARY_SUB_ASSIGN:
2643         case EXPR_BINARY_MUL_ASSIGN:
2644         case EXPR_BINARY_MOD_ASSIGN:
2645         case EXPR_BINARY_DIV_ASSIGN:
2646         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2647         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2648         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2649         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2650         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2651                 return create_assign_binop(expression);
2652         default:
2653                 panic("invalid binexpr type");
2654         }
2655 }
2656
2657 static ir_node *array_access_addr(const array_access_expression_t *expression)
2658 {
2659         dbg_info *dbgi        = get_dbg_info(&expression->base.source_position);
2660         ir_node  *base_addr   = expression_to_firm(expression->array_ref);
2661         ir_node  *offset      = expression_to_firm(expression->index);
2662         type_t   *ref_type    = skip_typeref(expression->array_ref->base.type);
2663         ir_node  *real_offset = adjust_for_pointer_arithmetic(dbgi, offset, ref_type);
2664         ir_node  *result      = new_d_Add(dbgi, base_addr, real_offset, mode_P_data);
2665
2666         return result;
2667 }
2668
2669 static ir_node *array_access_to_firm(
2670                 const array_access_expression_t *expression)
2671 {
2672         dbg_info *dbgi   = get_dbg_info(&expression->base.source_position);
2673         ir_node  *addr   = array_access_addr(expression);
2674         type_t   *type   = revert_automatic_type_conversion(
2675                         (const expression_t*) expression);
2676         type             = skip_typeref(type);
2677
2678         return deref_address(dbgi, type, addr);
2679 }
2680
2681 static long get_offsetof_offset(const offsetof_expression_t *expression)
2682 {
2683         type_t *orig_type = expression->type;
2684         long    offset    = 0;
2685
2686         designator_t *designator = expression->designator;
2687         for ( ; designator != NULL; designator = designator->next) {
2688                 type_t *type = skip_typeref(orig_type);
2689                 /* be sure the type is constructed */
2690                 (void) get_ir_type(type);
2691
2692                 if (designator->symbol != NULL) {
2693                         assert(is_type_compound(type));
2694                         symbol_t *symbol = designator->symbol;
2695
2696                         compound_t *compound = type->compound.compound;
2697                         entity_t   *iter     = compound->members.entities;
2698                         for (; iter->base.symbol != symbol; iter = iter->base.next) {}
2699
2700                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
2701                         assert(iter->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
2702                         offset += get_entity_offset(iter->compound_member.entity);
2703
2704                         orig_type = iter->declaration.type;
2705                 } else {
2706                         expression_t *array_index = designator->array_index;
2707                         assert(designator->array_index != NULL);
2708                         assert(is_type_array(type));
2709
2710                         long index         = fold_constant_to_int(array_index);
2711                         ir_type *arr_type  = get_ir_type(type);
2712                         ir_type *elem_type = get_array_element_type(arr_type);
2713                         long     elem_size = get_type_size_bytes(elem_type);
2714
2715                         offset += index * elem_size;
2716
2717                         orig_type = type->array.element_type;
2718                 }
2719         }
2720
2721         return offset;
2722 }
2723
2724 static ir_node *offsetof_to_firm(const offsetof_expression_t *expression)
2725 {
2726         ir_mode   *mode   = get_ir_mode_arithmetic(expression->base.type);
2727         long       offset = get_offsetof_offset(expression);
2728         ir_tarval *tv     = new_tarval_from_long(offset, mode);
2729         dbg_info  *dbgi   = get_dbg_info(&expression->base.source_position);
2730
2731         return new_d_Const(dbgi, tv);
2732 }
2733
2734 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
2735                                      ir_entity *entity, type_t *type);
2736 static ir_initializer_t *create_ir_initializer(
2737                 const initializer_t *initializer, type_t *type);
2738
2739 static ir_entity *create_initializer_entity(dbg_info *dbgi,
2740                                             initializer_t *initializer,
2741                                             type_t *type)
2742 {
2743         /* create the ir_initializer */
2744         PUSH_IRG(get_const_code_irg());
2745         ir_initializer_t *irinitializer = create_ir_initializer(initializer, type);
2746         POP_IRG();
2747
2748         ident     *const id          = id_unique("initializer.%u");
2749         ir_type   *const irtype      = get_ir_type(type);
2750         ir_type   *const global_type = get_glob_type();
2751         ir_entity *const entity      = new_d_entity(global_type, id, irtype, dbgi);
2752         set_entity_ld_ident(entity, id);
2753         set_entity_visibility(entity, ir_visibility_private);
2754         add_entity_linkage(entity, IR_LINKAGE_CONSTANT);
2755         set_entity_initializer(entity, irinitializer);
2756         return entity;
2757 }
2758
2759 static ir_node *compound_literal_addr(compound_literal_expression_t const *const expression)
2760 {
2761         dbg_info      *dbgi        = get_dbg_info(&expression->base.source_position);
2762         type_t        *type        = expression->type;
2763         initializer_t *initializer = expression->initializer;
2764
2765         if (is_constant_initializer(initializer) == EXPR_CLASS_CONSTANT) {
2766                 ir_entity *entity = create_initializer_entity(dbgi, initializer, type);
2767                 return create_symconst(dbgi, entity);
2768         } else {
2769                 /* create an entity on the stack */
2770                 ident   *const id     = id_unique("CompLit.%u");
2771                 ir_type *const irtype = get_ir_type(type);
2772                 ir_type *frame_type   = get_irg_frame_type(current_ir_graph);
2773
2774                 ir_entity *const entity = new_d_entity(frame_type, id, irtype, dbgi);
2775                 set_entity_ld_ident(entity, id);
2776
2777                 /* create initialisation code */
2778                 create_local_initializer(initializer, dbgi, entity, type);
2779
2780                 /* create a sel for the compound literal address */
2781                 ir_node *frame = get_irg_frame(current_ir_graph);
2782                 ir_node *sel   = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
2783                 return sel;
2784         }
2785 }
2786
2787 static ir_node *compound_literal_to_firm(compound_literal_expression_t const* const expr)
2788 {
2789         dbg_info *const dbgi = get_dbg_info(&expr->base.source_position);
2790         type_t   *const type = expr->type;
2791         ir_node  *const addr = compound_literal_addr(expr);
2792         return deref_address(dbgi, type, addr);
2793 }
2794
2795 /**
2796  * Transform a sizeof expression into Firm code.
2797  */
2798 static ir_node *sizeof_to_firm(const typeprop_expression_t *expression)
2799 {
2800         type_t *const type = skip_typeref(expression->type);
2801         /* §6.5.3.4:2 if the type is a VLA, evaluate the expression. */
2802         if (is_type_array(type) && type->array.is_vla
2803                         && expression->tp_expression != NULL) {
2804                 expression_to_firm(expression->tp_expression);
2805         }
2806
2807         return get_type_size_node(type);
2808 }
2809
2810 static entity_t *get_expression_entity(const expression_t *expression)
2811 {
2812         if (expression->kind != EXPR_REFERENCE)
2813                 return NULL;
2814
2815         return expression->reference.entity;
2816 }
2817
2818 static unsigned get_cparser_entity_alignment(const entity_t *entity)
2819 {
2820         switch(entity->kind) {
2821         case DECLARATION_KIND_CASES:
2822                 return entity->declaration.alignment;
2823         case ENTITY_STRUCT:
2824         case ENTITY_UNION:
2825                 return entity->compound.alignment;
2826         case ENTITY_TYPEDEF:
2827                 return entity->typedefe.alignment;
2828         default:
2829                 break;
2830         }
2831         return 0;
2832 }
2833
2834 /**
2835  * Transform an alignof expression into Firm code.
2836  */
2837 static ir_node *alignof_to_firm(const typeprop_expression_t *expression)
2838 {
2839         unsigned alignment = 0;
2840
2841         const expression_t *tp_expression = expression->tp_expression;
2842         if (tp_expression != NULL) {
2843                 entity_t *entity = get_expression_entity(tp_expression);
2844                 if (entity != NULL) {
2845                         alignment = get_cparser_entity_alignment(entity);
2846                 }
2847         }
2848
2849         if (alignment == 0) {
2850                 type_t *type = expression->type;
2851                 alignment = get_type_alignment(type);
2852         }
2853
2854         dbg_info  *dbgi = get_dbg_info(&expression->base.source_position);
2855         ir_mode   *mode = get_ir_mode_arithmetic(expression->base.type);
2856         ir_tarval *tv   = new_tarval_from_long(alignment, mode);
2857         return new_d_Const(dbgi, tv);
2858 }
2859
2860 static void init_ir_types(void);
2861
2862 ir_tarval *fold_constant_to_tarval(const expression_t *expression)
2863 {
2864         assert(is_constant_expression(expression) == EXPR_CLASS_CONSTANT);
2865
2866         bool constant_folding_old = constant_folding;
2867         constant_folding = true;
2868         int old_optimize         = get_optimize();
2869         int old_constant_folding = get_opt_constant_folding();
2870         set_optimize(1);
2871         set_opt_constant_folding(1);
2872
2873         init_ir_types();
2874
2875         PUSH_IRG(get_const_code_irg());
2876         ir_node *const cnst = _expression_to_firm(expression);
2877         POP_IRG();
2878
2879         set_optimize(old_optimize);
2880         set_opt_constant_folding(old_constant_folding);
2881
2882         if (!is_Const(cnst)) {
2883                 panic("couldn't fold constant");
2884         }
2885
2886         constant_folding = constant_folding_old;
2887
2888         ir_tarval *const tv   = get_Const_tarval(cnst);
2889         ir_mode   *const mode = get_ir_mode_arithmetic(skip_typeref(expression->base.type));
2890         return tarval_convert_to(tv, mode);
2891 }
2892
2893 /* this function is only used in parser.c, but it relies on libfirm functionality */
2894 bool constant_is_negative(const expression_t *expression)
2895 {
2896         ir_tarval *tv = fold_constant_to_tarval(expression);
2897         return tarval_is_negative(tv);
2898 }
2899
2900 long fold_constant_to_int(const expression_t *expression)
2901 {
2902         ir_tarval *tv = fold_constant_to_tarval(expression);
2903         if (!tarval_is_long(tv)) {
2904                 panic("result of constant folding is not integer");
2905         }
2906
2907         return get_tarval_long(tv);
2908 }
2909
2910 bool fold_constant_to_bool(const expression_t *expression)
2911 {
2912         ir_tarval *tv = fold_constant_to_tarval(expression);
2913         return !tarval_is_null(tv);
2914 }
2915
2916 static ir_node *conditional_to_firm(const conditional_expression_t *expression)
2917 {
2918         dbg_info *const dbgi = get_dbg_info(&expression->base.source_position);
2919
2920         /* first try to fold a constant condition */
2921         if (is_constant_expression(expression->condition) == EXPR_CLASS_CONSTANT) {
2922                 bool val = fold_constant_to_bool(expression->condition);
2923                 if (val) {
2924                         expression_t *true_expression = expression->true_expression;
2925                         if (true_expression == NULL)
2926                                 true_expression = expression->condition;
2927                         return expression_to_firm(true_expression);
2928                 } else {
2929                         return expression_to_firm(expression->false_expression);
2930                 }
2931         }
2932
2933         jump_target true_target;
2934         jump_target false_target;
2935         init_jump_target(&true_target,  NULL);
2936         init_jump_target(&false_target, NULL);
2937         ir_node *const cond_expr = create_condition_evaluation(expression->condition, &true_target, &false_target);
2938
2939         ir_node    *val = NULL;
2940         jump_target exit_target;
2941         init_jump_target(&exit_target, NULL);
2942
2943         if (enter_jump_target(&true_target)) {
2944                 if (expression->true_expression) {
2945                         val = expression_to_firm(expression->true_expression);
2946                 } else if (cond_expr && get_irn_mode(cond_expr) != mode_b) {
2947                         val = cond_expr;
2948                 } else {
2949                         /* Condition ended with a short circuit (&&, ||, !) operation or a
2950                          * comparison.  Generate a "1" as value for the true branch. */
2951                         val = new_Const(get_mode_one(mode_Is));
2952                 }
2953                 jump_to_target(&exit_target);
2954         }
2955
2956         if (enter_jump_target(&false_target)) {
2957                 ir_node *const false_val = expression_to_firm(expression->false_expression);
2958                 jump_to_target(&exit_target);
2959                 if (val) {
2960                         ir_node *const in[] = { val, false_val };
2961                         val = new_rd_Phi(dbgi, exit_target.block, lengthof(in), in, get_irn_mode(val));
2962                 } else {
2963                         val = false_val;
2964                 }
2965         }
2966
2967         if (!enter_jump_target(&exit_target)) {
2968                 set_cur_block(new_Block(0, NULL));
2969                 type_t *const type = skip_typeref(expression->base.type);
2970                 if (!is_type_void(type))
2971                         val = new_Unknown(get_ir_mode_arithmetic(type));
2972         }
2973         return val;
2974 }
2975
2976 /**
2977  * Returns an IR-node representing the address of a field.
2978  */
2979 static ir_node *select_addr(const select_expression_t *expression)
2980 {
2981         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2982
2983         construct_select_compound(expression);
2984
2985         ir_node *compound_addr = expression_to_firm(expression->compound);
2986
2987         entity_t *entry = expression->compound_entry;
2988         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
2989         assert(entry->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
2990
2991         if (constant_folding) {
2992                 ir_mode *mode      = get_irn_mode(compound_addr);
2993                 ir_mode *mode_uint = get_reference_mode_unsigned_eq(mode);
2994                 ir_node *ofs       = new_Const_long(mode_uint, entry->compound_member.offset);
2995                 return new_d_Add(dbgi, compound_addr, ofs, mode);
2996         } else {
2997                 ir_entity *irentity = entry->compound_member.entity;
2998                 assert(irentity != NULL);
2999                 return new_d_simpleSel(dbgi, new_NoMem(), compound_addr, irentity);
3000         }
3001 }
3002
3003 static ir_node *select_to_firm(const select_expression_t *expression)
3004 {
3005         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3006         ir_node  *addr = select_addr(expression);
3007         type_t   *type = revert_automatic_type_conversion(
3008                         (const expression_t*) expression);
3009         type           = skip_typeref(type);
3010
3011         entity_t *entry = expression->compound_entry;
3012         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3013
3014         if (entry->compound_member.bitfield) {
3015                 return bitfield_extract_to_firm(expression, addr);
3016         }
3017
3018         return deref_address(dbgi, type, addr);
3019 }
3020
3021 /* Values returned by __builtin_classify_type. */
3022 typedef enum gcc_type_class
3023 {
3024         no_type_class = -1,
3025         void_type_class,
3026         integer_type_class,
3027         char_type_class,
3028         enumeral_type_class,
3029         boolean_type_class,
3030         pointer_type_class,
3031         reference_type_class,
3032         offset_type_class,
3033         real_type_class,
3034         complex_type_class,
3035         function_type_class,
3036         method_type_class,
3037         record_type_class,
3038         union_type_class,
3039         array_type_class,
3040         string_type_class,
3041         set_type_class,
3042         file_type_class,
3043         lang_type_class
3044 } gcc_type_class;
3045
3046 static ir_node *classify_type_to_firm(const classify_type_expression_t *const expr)
3047 {
3048         type_t *type = expr->type_expression->base.type;
3049
3050         /* FIXME gcc returns different values depending on whether compiling C or C++
3051          * e.g. int x[10] is pointer_type_class in C, but array_type_class in C++ */
3052         gcc_type_class tc;
3053         for (;;) {
3054                 type = skip_typeref(type);
3055                 switch (type->kind) {
3056                         case TYPE_ATOMIC: {
3057                                 const atomic_type_t *const atomic_type = &type->atomic;
3058                                 switch (atomic_type->akind) {
3059                                         /* gcc cannot do that */
3060                                         case ATOMIC_TYPE_VOID:
3061                                                 tc = void_type_class;
3062                                                 goto make_const;
3063
3064                                         case ATOMIC_TYPE_WCHAR_T:   /* gcc handles this as integer */
3065                                         case ATOMIC_TYPE_CHAR:      /* gcc handles this as integer */
3066                                         case ATOMIC_TYPE_SCHAR:     /* gcc handles this as integer */
3067                                         case ATOMIC_TYPE_UCHAR:     /* gcc handles this as integer */
3068                                         case ATOMIC_TYPE_SHORT:
3069                                         case ATOMIC_TYPE_USHORT:
3070                                         case ATOMIC_TYPE_INT:
3071                                         case ATOMIC_TYPE_UINT:
3072                                         case ATOMIC_TYPE_LONG:
3073                                         case ATOMIC_TYPE_ULONG:
3074                                         case ATOMIC_TYPE_LONGLONG:
3075                                         case ATOMIC_TYPE_ULONGLONG:
3076                                         case ATOMIC_TYPE_BOOL:      /* gcc handles this as integer */
3077                                                 tc = integer_type_class;
3078                                                 goto make_const;
3079
3080                                         case ATOMIC_TYPE_FLOAT:
3081                                         case ATOMIC_TYPE_DOUBLE:
3082                                         case ATOMIC_TYPE_LONG_DOUBLE:
3083                                                 tc = real_type_class;
3084                                                 goto make_const;
3085                                 }
3086                                 panic("Unexpected atomic type.");
3087                         }
3088
3089                         case TYPE_COMPLEX:         tc = complex_type_class; goto make_const;
3090                         case TYPE_IMAGINARY:       tc = complex_type_class; goto make_const;
3091                         case TYPE_ARRAY:           /* gcc handles this as pointer */
3092                         case TYPE_FUNCTION:        /* gcc handles this as pointer */
3093                         case TYPE_POINTER:         tc = pointer_type_class; goto make_const;
3094                         case TYPE_COMPOUND_STRUCT: tc = record_type_class;  goto make_const;
3095                         case TYPE_COMPOUND_UNION:  tc = union_type_class;   goto make_const;
3096
3097                         /* gcc handles this as integer */
3098                         case TYPE_ENUM:            tc = integer_type_class; goto make_const;
3099
3100                         /* gcc classifies the referenced type */
3101                         case TYPE_REFERENCE: type = type->reference.refers_to; continue;
3102
3103                         /* typedef/typeof should be skipped already */
3104                         case TYPE_TYPEDEF:
3105                         case TYPE_TYPEOF:
3106                         case TYPE_ERROR:
3107                                 break;
3108                 }
3109                 panic("unexpected type.");
3110         }
3111
3112 make_const:;
3113         dbg_info  *const dbgi = get_dbg_info(&expr->base.source_position);
3114         ir_mode   *const mode = atomic_modes[ATOMIC_TYPE_INT];
3115         ir_tarval *const tv   = new_tarval_from_long(tc, mode);
3116         return new_d_Const(dbgi, tv);
3117 }
3118
3119 static ir_node *function_name_to_firm(
3120                 const funcname_expression_t *const expr)
3121 {
3122         switch(expr->kind) {
3123         case FUNCNAME_FUNCTION:
3124         case FUNCNAME_PRETTY_FUNCTION:
3125         case FUNCNAME_FUNCDNAME:
3126                 if (current_function_name == NULL) {
3127                         source_position_t const *const src_pos = &expr->base.source_position;
3128                         char              const *const name    = current_function_entity->base.symbol->string;
3129                         string_t                 const string  = { name, strlen(name), STRING_ENCODING_CHAR };
3130                         current_function_name = string_to_firm(src_pos, "__func__.%u", &string);
3131                 }
3132                 return current_function_name;
3133         case FUNCNAME_FUNCSIG:
3134                 if (current_funcsig == NULL) {
3135                         source_position_t const *const src_pos = &expr->base.source_position;
3136                         ir_entity               *const ent     = get_irg_entity(current_ir_graph);
3137                         char              const *const name    = get_entity_ld_name(ent);
3138                         string_t                 const string  = { name, strlen(name), STRING_ENCODING_CHAR };
3139                         current_funcsig = string_to_firm(src_pos, "__FUNCSIG__.%u", &string);
3140                 }
3141                 return current_funcsig;
3142         }
3143         panic("Unsupported function name");
3144 }
3145
3146 static ir_node *statement_expression_to_firm(const statement_expression_t *expr)
3147 {
3148         statement_t *statement = expr->statement;
3149
3150         assert(statement->kind == STATEMENT_COMPOUND);
3151         return compound_statement_to_firm(&statement->compound);
3152 }
3153
3154 static ir_node *va_start_expression_to_firm(
3155         const va_start_expression_t *const expr)
3156 {
3157         ir_entity *param_ent = current_vararg_entity;
3158         if (param_ent == NULL) {
3159                 size_t   const n           = IR_VA_START_PARAMETER_NUMBER;
3160                 ir_type *const frame_type  = get_irg_frame_type(current_ir_graph);
3161                 ir_type *const param_type  = get_unknown_type();
3162                 param_ent = new_parameter_entity(frame_type, n, param_type);
3163                 current_vararg_entity = param_ent;
3164         }
3165
3166         ir_node  *const frame   = get_irg_frame(current_ir_graph);
3167         dbg_info *const dbgi    = get_dbg_info(&expr->base.source_position);
3168         ir_node  *const no_mem  = new_NoMem();
3169         ir_node  *const arg_sel = new_d_simpleSel(dbgi, no_mem, frame, param_ent);
3170
3171         set_value_for_expression(expr->ap, arg_sel);
3172
3173         return NULL;
3174 }
3175
3176 static ir_node *va_arg_expression_to_firm(const va_arg_expression_t *const expr)
3177 {
3178         type_t       *const type    = expr->base.type;
3179         expression_t *const ap_expr = expr->ap;
3180         ir_node      *const ap_addr = expression_to_addr(ap_expr);
3181         ir_node      *const ap      = get_value_from_lvalue(ap_expr, ap_addr);
3182         dbg_info     *const dbgi    = get_dbg_info(&expr->base.source_position);
3183         ir_node      *const res     = deref_address(dbgi, type, ap);
3184
3185         ir_node      *const cnst    = get_type_size_node(expr->base.type);
3186         ir_mode      *const mode    = get_irn_mode(cnst);
3187         ir_node      *const c1      = new_Const_long(mode, stack_param_align - 1);
3188         ir_node      *const c2      = new_d_Add(dbgi, cnst, c1, mode);
3189         ir_node      *const c3      = new_Const_long(mode, -(long)stack_param_align);
3190         ir_node      *const c4      = new_d_And(dbgi, c2, c3, mode);
3191         ir_node      *const add     = new_d_Add(dbgi, ap, c4, mode_P_data);
3192
3193         set_value_for_expression_addr(ap_expr, add, ap_addr);
3194
3195         return res;
3196 }
3197
3198 /**
3199  * Generate Firm for a va_copy expression.
3200  */
3201 static ir_node *va_copy_expression_to_firm(const va_copy_expression_t *const expr)
3202 {
3203         ir_node *const src = expression_to_firm(expr->src);
3204         set_value_for_expression(expr->dst, src);
3205         return NULL;
3206 }
3207
3208 static ir_node *dereference_addr(const unary_expression_t *const expression)
3209 {
3210         assert(expression->base.kind == EXPR_UNARY_DEREFERENCE);
3211         return expression_to_firm(expression->value);
3212 }
3213
3214 /**
3215  * Returns a IR-node representing an lvalue of the given expression.
3216  */
3217 static ir_node *expression_to_addr(const expression_t *expression)
3218 {
3219         switch(expression->kind) {
3220         case EXPR_ARRAY_ACCESS:
3221                 return array_access_addr(&expression->array_access);
3222         case EXPR_CALL:
3223                 return call_expression_to_firm(&expression->call);
3224         case EXPR_COMPOUND_LITERAL:
3225                 return compound_literal_addr(&expression->compound_literal);
3226         case EXPR_REFERENCE:
3227                 return reference_addr(&expression->reference);
3228         case EXPR_SELECT:
3229                 return select_addr(&expression->select);
3230         case EXPR_UNARY_DEREFERENCE:
3231                 return dereference_addr(&expression->unary);
3232         default:
3233                 break;
3234         }
3235         panic("trying to get address of non-lvalue");
3236 }
3237
3238 static ir_node *builtin_constant_to_firm(
3239                 const builtin_constant_expression_t *expression)
3240 {
3241         ir_mode *const mode = get_ir_mode_arithmetic(expression->base.type);
3242         bool     const v    = is_constant_expression(expression->value) == EXPR_CLASS_CONSTANT;
3243         return create_Const_from_bool(mode, v);
3244 }
3245
3246 static ir_node *builtin_types_compatible_to_firm(
3247                 const builtin_types_compatible_expression_t *expression)
3248 {
3249         type_t  *const left  = get_unqualified_type(skip_typeref(expression->left));
3250         type_t  *const right = get_unqualified_type(skip_typeref(expression->right));
3251         bool     const value = types_compatible(left, right);
3252         ir_mode *const mode  = get_ir_mode_arithmetic(expression->base.type);
3253         return create_Const_from_bool(mode, value);
3254 }
3255
3256 static void prepare_label_target(label_t *const label)
3257 {
3258         if (label->address_taken && !label->indirect_block) {
3259                 ir_node *const iblock = new_immBlock();
3260                 label->indirect_block = iblock;
3261                 ARR_APP1(ir_node*, ijmp_blocks, iblock);
3262                 jump_from_block_to_target(&label->target, iblock);
3263         }
3264 }
3265
3266 /**
3267  * Pointer to a label.  This is used for the
3268  * GNU address-of-label extension.
3269  */
3270 static ir_node *label_address_to_firm(const label_address_expression_t *label)
3271 {
3272         /* Beware: Might be called from create initializer with current_ir_graph
3273          * set to const_code_irg. */
3274         PUSH_IRG(current_function);
3275         prepare_label_target(label->label);
3276         POP_IRG();
3277
3278         symconst_symbol value;
3279         value.entity_p = create_Block_entity(label->label->indirect_block);
3280         dbg_info *const dbgi = get_dbg_info(&label->base.source_position);
3281         return new_d_SymConst(dbgi, mode_P_code, value, symconst_addr_ent);
3282 }
3283
3284 /**
3285  * creates firm nodes for an expression. The difference between this function
3286  * and expression_to_firm is, that this version might produce mode_b nodes
3287  * instead of mode_Is.
3288  */
3289 static ir_node *_expression_to_firm(expression_t const *const expr)
3290 {
3291 #ifndef NDEBUG
3292         if (!constant_folding) {
3293                 assert(!expr->base.transformed);
3294                 ((expression_t*)expr)->base.transformed = true;
3295         }
3296 #endif
3297
3298         switch (expr->kind) {
3299         case EXPR_ALIGNOF:                    return alignof_to_firm(                 &expr->typeprop);
3300         case EXPR_ARRAY_ACCESS:               return array_access_to_firm(            &expr->array_access);
3301         case EXPR_BINARY_CASES:               return binary_expression_to_firm(       &expr->binary);
3302         case EXPR_BUILTIN_CONSTANT_P:         return builtin_constant_to_firm(        &expr->builtin_constant);
3303         case EXPR_BUILTIN_TYPES_COMPATIBLE_P: return builtin_types_compatible_to_firm(&expr->builtin_types_compatible);
3304         case EXPR_CALL:                       return call_expression_to_firm(         &expr->call);
3305         case EXPR_CLASSIFY_TYPE:              return classify_type_to_firm(           &expr->classify_type);
3306         case EXPR_COMPOUND_LITERAL:           return compound_literal_to_firm(        &expr->compound_literal);
3307         case EXPR_CONDITIONAL:                return conditional_to_firm(             &expr->conditional);
3308         case EXPR_FUNCNAME:                   return function_name_to_firm(           &expr->funcname);
3309         case EXPR_LABEL_ADDRESS:              return label_address_to_firm(           &expr->label_address);
3310         case EXPR_LITERAL_CASES:              return literal_to_firm(                 &expr->literal);
3311         case EXPR_LITERAL_CHARACTER:          return char_literal_to_firm(            &expr->string_literal);
3312         case EXPR_OFFSETOF:                   return offsetof_to_firm(                &expr->offsetofe);
3313         case EXPR_REFERENCE:                  return reference_expression_to_firm(    &expr->reference);
3314         case EXPR_ENUM_CONSTANT:              return enum_constant_to_firm(           &expr->reference);
3315         case EXPR_SELECT:                     return select_to_firm(                  &expr->select);
3316         case EXPR_SIZEOF:                     return sizeof_to_firm(                  &expr->typeprop);
3317         case EXPR_STATEMENT:                  return statement_expression_to_firm(    &expr->statement);
3318         case EXPR_UNARY_CASES:                return unary_expression_to_firm(        &expr->unary);
3319         case EXPR_VA_ARG:                     return va_arg_expression_to_firm(       &expr->va_arge);
3320         case EXPR_VA_COPY:                    return va_copy_expression_to_firm(      &expr->va_copye);
3321         case EXPR_VA_START:                   return va_start_expression_to_firm(     &expr->va_starte);
3322
3323         case EXPR_STRING_LITERAL: return string_to_firm(&expr->base.source_position, "str.%u", &expr->string_literal.value);
3324
3325         case EXPR_ERROR: break;
3326         }
3327         panic("invalid expression");
3328 }
3329
3330 /**
3331  * Check if a given expression is a GNU __builtin_expect() call.
3332  */
3333 static bool is_builtin_expect(const expression_t *expression)
3334 {
3335         if (expression->kind != EXPR_CALL)
3336                 return false;
3337
3338         expression_t *function = expression->call.function;
3339         if (function->kind != EXPR_REFERENCE)
3340                 return false;
3341         reference_expression_t *ref = &function->reference;
3342         if (ref->entity->kind         != ENTITY_FUNCTION ||
3343             ref->entity->function.btk != BUILTIN_EXPECT)
3344                 return false;
3345
3346         return true;
3347 }
3348
3349 static bool produces_mode_b(const expression_t *expression)
3350 {
3351         switch (expression->kind) {
3352         case EXPR_BINARY_EQUAL:
3353         case EXPR_BINARY_NOTEQUAL:
3354         case EXPR_BINARY_LESS:
3355         case EXPR_BINARY_LESSEQUAL:
3356         case EXPR_BINARY_GREATER:
3357         case EXPR_BINARY_GREATEREQUAL:
3358         case EXPR_BINARY_ISGREATER:
3359         case EXPR_BINARY_ISGREATEREQUAL:
3360         case EXPR_BINARY_ISLESS:
3361         case EXPR_BINARY_ISLESSEQUAL:
3362         case EXPR_BINARY_ISLESSGREATER:
3363         case EXPR_BINARY_ISUNORDERED:
3364         case EXPR_UNARY_NOT:
3365                 return true;
3366
3367         case EXPR_CALL:
3368                 if (is_builtin_expect(expression)) {
3369                         expression_t *argument = expression->call.arguments->expression;
3370                         return produces_mode_b(argument);
3371                 }
3372                 return false;
3373         case EXPR_BINARY_COMMA:
3374                 return produces_mode_b(expression->binary.right);
3375
3376         default:
3377                 return false;
3378         }
3379 }
3380
3381 static ir_node *expression_to_firm(const expression_t *expression)
3382 {
3383         if (!produces_mode_b(expression)) {
3384                 ir_node *res = _expression_to_firm(expression);
3385                 assert(res == NULL || get_irn_mode(res) != mode_b);
3386                 return res;
3387         }
3388
3389         if (is_constant_expression(expression) == EXPR_CLASS_CONSTANT) {
3390                 return new_Const(fold_constant_to_tarval(expression));
3391         }
3392
3393         /* we have to produce a 0/1 from the mode_b expression */
3394         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3395         ir_mode  *mode = get_ir_mode_arithmetic(expression->base.type);
3396         return produce_condition_result(expression, mode, dbgi);
3397 }
3398
3399 /**
3400  * create a short-circuit expression evaluation that tries to construct
3401  * efficient control flow structures for &&, || and ! expressions
3402  */
3403 static ir_node *create_condition_evaluation(expression_t const *const expression, jump_target *const true_target, jump_target *const false_target)
3404 {
3405         switch(expression->kind) {
3406         case EXPR_UNARY_NOT: {
3407                 const unary_expression_t *unary_expression = &expression->unary;
3408                 create_condition_evaluation(unary_expression->value, false_target, true_target);
3409                 return NULL;
3410         }
3411         case EXPR_BINARY_LOGICAL_AND: {
3412                 jump_target extra_target;
3413                 init_jump_target(&extra_target, NULL);
3414                 create_condition_evaluation(expression->binary.left, &extra_target, false_target);
3415                 if (enter_jump_target(&extra_target))
3416                         create_condition_evaluation(expression->binary.right, true_target, false_target);
3417                 return NULL;
3418         }
3419         case EXPR_BINARY_LOGICAL_OR: {
3420                 jump_target extra_target;
3421                 init_jump_target(&extra_target, NULL);
3422                 create_condition_evaluation(expression->binary.left, true_target, &extra_target);
3423                 if (enter_jump_target(&extra_target))
3424                         create_condition_evaluation(expression->binary.right, true_target, false_target);
3425                 return NULL;
3426         }
3427         default:
3428                 break;
3429         }
3430
3431         dbg_info *dbgi       = get_dbg_info(&expression->base.source_position);
3432         ir_node  *cond_expr  = _expression_to_firm(expression);
3433         ir_node  *condition  = create_conv(dbgi, cond_expr, mode_b);
3434         ir_node  *cond       = new_d_Cond(dbgi, condition);
3435         ir_node  *true_proj  = new_d_Proj(dbgi, cond, mode_X, pn_Cond_true);
3436         ir_node  *false_proj = new_d_Proj(dbgi, cond, mode_X, pn_Cond_false);
3437
3438         /* set branch prediction info based on __builtin_expect */
3439         if (is_builtin_expect(expression) && is_Cond(cond)) {
3440                 call_argument_t *argument = expression->call.arguments->next;
3441                 if (is_constant_expression(argument->expression) == EXPR_CLASS_CONSTANT) {
3442                         bool               const cnst = fold_constant_to_bool(argument->expression);
3443                         cond_jmp_predicate const pred = cnst ? COND_JMP_PRED_TRUE : COND_JMP_PRED_FALSE;
3444                         set_Cond_jmp_pred(cond, pred);
3445                 }
3446         }
3447
3448         add_pred_to_jump_target(true_target,  true_proj);
3449         add_pred_to_jump_target(false_target, false_proj);
3450
3451         set_unreachable_now();
3452         return cond_expr;
3453 }
3454
3455 static void create_variable_entity(entity_t *variable,
3456                                    declaration_kind_t declaration_kind,
3457                                    ir_type *parent_type)
3458 {
3459         assert(variable->kind == ENTITY_VARIABLE);
3460         type_t    *type = skip_typeref(variable->declaration.type);
3461
3462         ident     *const id        = new_id_from_str(variable->base.symbol->string);
3463         ir_type   *const irtype    = get_ir_type(type);
3464         dbg_info  *const dbgi      = get_dbg_info(&variable->base.source_position);
3465         ir_entity *const irentity  = new_d_entity(parent_type, id, irtype, dbgi);
3466         unsigned         alignment = variable->declaration.alignment;
3467
3468         set_entity_alignment(irentity, alignment);
3469
3470         handle_decl_modifiers(irentity, variable);
3471
3472         variable->declaration.kind  = (unsigned char) declaration_kind;
3473         variable->variable.v.entity = irentity;
3474         set_entity_ld_ident(irentity, create_ld_ident(variable));
3475
3476         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
3477                 set_entity_volatility(irentity, volatility_is_volatile);
3478         }
3479 }
3480
3481
3482 typedef struct type_path_entry_t type_path_entry_t;
3483 struct type_path_entry_t {
3484         type_t           *type;
3485         ir_initializer_t *initializer;
3486         size_t            index;
3487         entity_t         *compound_entry;
3488 };
3489
3490 typedef struct type_path_t type_path_t;
3491 struct type_path_t {
3492         type_path_entry_t *path;
3493         type_t            *top_type;
3494         bool               invalid;
3495 };
3496
3497 static __attribute__((unused)) void debug_print_type_path(const type_path_t *path)
3498 {
3499         size_t len = ARR_LEN(path->path);
3500
3501         for (size_t i = 0; i < len; ++i) {
3502                 const type_path_entry_t *entry = & path->path[i];
3503
3504                 type_t *type = skip_typeref(entry->type);
3505                 if (is_type_compound(type)) {
3506                         fprintf(stderr, ".%s", entry->compound_entry->base.symbol->string);
3507                 } else if (is_type_array(type)) {
3508                         fprintf(stderr, "[%u]", (unsigned) entry->index);
3509                 } else {
3510                         fprintf(stderr, "-INVALID-");
3511                 }
3512         }
3513         fprintf(stderr, "  (");
3514         print_type(path->top_type);
3515         fprintf(stderr, ")");
3516 }
3517
3518 static type_path_entry_t *get_type_path_top(const type_path_t *path)
3519 {
3520         size_t len = ARR_LEN(path->path);
3521         assert(len > 0);
3522         return & path->path[len-1];
3523 }
3524
3525 static type_path_entry_t *append_to_type_path(type_path_t *path)
3526 {
3527         size_t len = ARR_LEN(path->path);
3528         ARR_RESIZE(type_path_entry_t, path->path, len+1);
3529
3530         type_path_entry_t *result = & path->path[len];
3531         memset(result, 0, sizeof(result[0]));
3532         return result;
3533 }
3534
3535 static size_t get_compound_member_count(const compound_type_t *type)
3536 {
3537         compound_t *compound  = type->compound;
3538         size_t      n_members = 0;
3539         entity_t   *member    = compound->members.entities;
3540         for ( ; member != NULL; member = member->base.next) {
3541                 ++n_members;
3542         }
3543
3544         return n_members;
3545 }
3546
3547 static ir_initializer_t *get_initializer_entry(type_path_t *path)
3548 {
3549         type_t *orig_top_type = path->top_type;
3550         type_t *top_type      = skip_typeref(orig_top_type);
3551
3552         assert(is_type_compound(top_type) || is_type_array(top_type));
3553
3554         if (ARR_LEN(path->path) == 0) {
3555                 return NULL;
3556         } else {
3557                 type_path_entry_t *top         = get_type_path_top(path);
3558                 ir_initializer_t  *initializer = top->initializer;
3559                 return get_initializer_compound_value(initializer, top->index);
3560         }
3561 }
3562
3563 static void descend_into_subtype(type_path_t *path)
3564 {
3565         type_t *orig_top_type = path->top_type;
3566         type_t *top_type      = skip_typeref(orig_top_type);
3567
3568         assert(is_type_compound(top_type) || is_type_array(top_type));
3569
3570         ir_initializer_t *initializer = get_initializer_entry(path);
3571
3572         type_path_entry_t *top = append_to_type_path(path);
3573         top->type              = top_type;
3574
3575         size_t len;
3576
3577         if (is_type_compound(top_type)) {
3578                 compound_t *const compound = top_type->compound.compound;
3579                 entity_t   *const entry    = skip_unnamed_bitfields(compound->members.entities);
3580
3581                 top->compound_entry = entry;
3582                 top->index          = 0;
3583                 len                 = get_compound_member_count(&top_type->compound);
3584                 if (entry != NULL) {
3585                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3586                         path->top_type = entry->declaration.type;
3587                 }
3588         } else {
3589                 assert(is_type_array(top_type));
3590                 assert(top_type->array.size > 0);
3591
3592                 top->index     = 0;
3593                 path->top_type = top_type->array.element_type;
3594                 len            = top_type->array.size;
3595         }
3596         if (initializer == NULL
3597                         || get_initializer_kind(initializer) == IR_INITIALIZER_NULL) {
3598                 initializer = create_initializer_compound(len);
3599                 /* we have to set the entry at the 2nd latest path entry... */
3600                 size_t path_len = ARR_LEN(path->path);
3601                 assert(path_len >= 1);
3602                 if (path_len > 1) {
3603                         type_path_entry_t *entry        = & path->path[path_len-2];
3604                         ir_initializer_t  *tinitializer = entry->initializer;
3605                         set_initializer_compound_value(tinitializer, entry->index,
3606                                                        initializer);
3607                 }
3608         }
3609         top->initializer = initializer;
3610 }
3611
3612 static void ascend_from_subtype(type_path_t *path)
3613 {
3614         type_path_entry_t *top = get_type_path_top(path);
3615
3616         path->top_type = top->type;
3617
3618         size_t len = ARR_LEN(path->path);
3619         ARR_RESIZE(type_path_entry_t, path->path, len-1);
3620 }
3621
3622 static void walk_designator(type_path_t *path, const designator_t *designator)
3623 {
3624         /* designators start at current object type */
3625         ARR_RESIZE(type_path_entry_t, path->path, 1);
3626
3627         for ( ; designator != NULL; designator = designator->next) {
3628                 type_path_entry_t *top         = get_type_path_top(path);
3629                 type_t            *orig_type   = top->type;
3630                 type_t            *type        = skip_typeref(orig_type);
3631
3632                 if (designator->symbol != NULL) {
3633                         assert(is_type_compound(type));
3634                         size_t    index  = 0;
3635                         symbol_t *symbol = designator->symbol;
3636
3637                         compound_t *compound = type->compound.compound;
3638                         entity_t   *iter     = compound->members.entities;
3639                         for (; iter->base.symbol != symbol; iter = iter->base.next, ++index) {}
3640                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
3641
3642                         /* revert previous initialisations of other union elements */
3643                         if (type->kind == TYPE_COMPOUND_UNION) {
3644                                 ir_initializer_t *initializer = top->initializer;
3645                                 if (initializer != NULL
3646                                         && get_initializer_kind(initializer) == IR_INITIALIZER_COMPOUND) {
3647                                         /* are we writing to a new element? */
3648                                         ir_initializer_t *oldi
3649                                                 = get_initializer_compound_value(initializer, index);
3650                                         if (get_initializer_kind(oldi) == IR_INITIALIZER_NULL) {
3651                                                 /* clear initializer */
3652                                                 size_t len
3653                                                         = get_initializer_compound_n_entries(initializer);
3654                                                 ir_initializer_t *nulli = get_initializer_null();
3655                                                 for (size_t i = 0; i < len; ++i) {
3656                                                         set_initializer_compound_value(initializer, i,
3657                                                                                        nulli);
3658                                                 }
3659                                         }
3660                                 }
3661                         }
3662
3663                         top->type           = orig_type;
3664                         top->compound_entry = iter;
3665                         top->index          = index;
3666                         orig_type           = iter->declaration.type;
3667                 } else {
3668                         expression_t *array_index = designator->array_index;
3669                         assert(is_type_array(type));
3670
3671                         long index = fold_constant_to_int(array_index);
3672                         assert(0 <= index && (!type->array.size_constant || (size_t)index < type->array.size));
3673
3674                         top->type  = orig_type;
3675                         top->index = (size_t) index;
3676                         orig_type  = type->array.element_type;
3677                 }
3678                 path->top_type = orig_type;
3679
3680                 if (designator->next != NULL) {
3681                         descend_into_subtype(path);
3682                 }
3683         }
3684
3685         path->invalid  = false;
3686 }
3687
3688 static void advance_current_object(type_path_t *path)
3689 {
3690         if (path->invalid) {
3691                 /* TODO: handle this... */
3692                 panic("invalid initializer (excessive elements)");
3693         }
3694
3695         type_path_entry_t *top = get_type_path_top(path);
3696
3697         type_t *type = skip_typeref(top->type);
3698         if (is_type_union(type)) {
3699                 /* only the first element is initialized in unions */
3700                 top->compound_entry = NULL;
3701         } else if (is_type_struct(type)) {
3702                 entity_t *entry = top->compound_entry;
3703
3704                 top->index++;
3705                 entry               = skip_unnamed_bitfields(entry->base.next);
3706                 top->compound_entry = entry;
3707                 if (entry != NULL) {
3708                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3709                         path->top_type = entry->declaration.type;
3710                         return;
3711                 }
3712         } else {
3713                 assert(is_type_array(type));
3714
3715                 top->index++;
3716                 if (!type->array.size_constant || top->index < type->array.size) {
3717                         return;
3718                 }
3719         }
3720
3721         /* we're past the last member of the current sub-aggregate, try if we
3722          * can ascend in the type hierarchy and continue with another subobject */
3723         size_t len = ARR_LEN(path->path);
3724
3725         if (len > 1) {
3726                 ascend_from_subtype(path);
3727                 advance_current_object(path);
3728         } else {
3729                 path->invalid = true;
3730         }
3731 }
3732
3733
3734 static ir_initializer_t *create_ir_initializer_value(
3735                 const initializer_value_t *initializer)
3736 {
3737         if (is_type_compound(initializer->value->base.type)) {
3738                 panic("initializer creation for compounds not implemented yet");
3739         }
3740         type_t       *type = initializer->value->base.type;
3741         expression_t *expr = initializer->value;
3742         ir_node *value = expression_to_firm(expr);
3743         ir_mode *mode  = get_ir_mode_storage(type);
3744         value          = create_conv(NULL, value, mode);
3745         return create_initializer_const(value);
3746 }
3747
3748 /** test wether type can be initialized by a string constant */
3749 static bool is_string_type(type_t *type)
3750 {
3751         if (!is_type_array(type))
3752                 return false;
3753
3754         type_t *const inner = skip_typeref(type->array.element_type);
3755         return is_type_integer(inner);
3756 }
3757
3758 static ir_initializer_t *create_ir_initializer_list(
3759                 const initializer_list_t *initializer, type_t *type)
3760 {
3761         type_path_t path;
3762         memset(&path, 0, sizeof(path));
3763         path.top_type = type;
3764         path.path     = NEW_ARR_F(type_path_entry_t, 0);
3765
3766         descend_into_subtype(&path);
3767
3768         for (size_t i = 0; i < initializer->len; ++i) {
3769                 const initializer_t *sub_initializer = initializer->initializers[i];
3770
3771                 if (sub_initializer->kind == INITIALIZER_DESIGNATOR) {
3772                         walk_designator(&path, sub_initializer->designator.designator);
3773                         continue;
3774                 }
3775
3776                 if (sub_initializer->kind == INITIALIZER_VALUE) {
3777                         /* we might have to descend into types until we're at a scalar
3778                          * type */
3779                         while(true) {
3780                                 type_t *orig_top_type = path.top_type;
3781                                 type_t *top_type      = skip_typeref(orig_top_type);
3782
3783                                 if (is_type_scalar(top_type))
3784                                         break;
3785                                 descend_into_subtype(&path);
3786                         }
3787                 } else if (sub_initializer->kind == INITIALIZER_STRING) {
3788                         /* we might have to descend into types until we're at a scalar
3789                          * type */
3790                         while (true) {
3791                                 type_t *orig_top_type = path.top_type;
3792                                 type_t *top_type      = skip_typeref(orig_top_type);
3793
3794                                 if (is_string_type(top_type))
3795                                         break;
3796                                 descend_into_subtype(&path);
3797                         }
3798                 }
3799
3800                 ir_initializer_t *sub_irinitializer
3801                         = create_ir_initializer(sub_initializer, path.top_type);
3802
3803                 size_t path_len = ARR_LEN(path.path);
3804                 assert(path_len >= 1);
3805                 type_path_entry_t *entry        = & path.path[path_len-1];
3806                 ir_initializer_t  *tinitializer = entry->initializer;
3807                 set_initializer_compound_value(tinitializer, entry->index,
3808                                                sub_irinitializer);
3809
3810                 advance_current_object(&path);
3811         }
3812
3813         assert(ARR_LEN(path.path) >= 1);
3814         ir_initializer_t *result = path.path[0].initializer;
3815         DEL_ARR_F(path.path);
3816
3817         return result;
3818 }
3819
3820 static ir_initializer_t *create_ir_initializer_string(initializer_t const *const init, type_t *type)
3821 {
3822         type = skip_typeref(type);
3823
3824         assert(type->kind == TYPE_ARRAY);
3825         assert(type->array.size_constant);
3826         string_literal_expression_t const *const str = get_init_string(init);
3827         size_t            const str_len = str->value.size;
3828         size_t            const arr_len = type->array.size;
3829         ir_initializer_t *const irinit  = create_initializer_compound(arr_len);
3830         ir_mode          *const mode    = get_ir_mode_storage(type->array.element_type);
3831         char const       *      p       = str->value.begin;
3832         switch (str->value.encoding) {
3833         case STRING_ENCODING_CHAR:
3834         case STRING_ENCODING_UTF8:
3835                 for (size_t i = 0; i != arr_len; ++i) {
3836                         char              const c      = i < str_len ? *p++ : 0;
3837                         ir_tarval        *const tv     = new_tarval_from_long(c, mode);
3838                         ir_initializer_t *const tvinit = create_initializer_tarval(tv);
3839                         set_initializer_compound_value(irinit, i, tvinit);
3840                 }
3841                 break;
3842
3843         case STRING_ENCODING_CHAR16:
3844         case STRING_ENCODING_CHAR32:
3845         case STRING_ENCODING_WIDE:
3846                 for (size_t i = 0; i != arr_len; ++i) {
3847                         utf32             const c      = i < str_len ? read_utf8_char(&p) : 0;
3848                         ir_tarval        *const tv     = new_tarval_from_long(c, mode);
3849                         ir_initializer_t *const tvinit = create_initializer_tarval(tv);
3850                         set_initializer_compound_value(irinit, i, tvinit);
3851                 }
3852                 break;
3853         }
3854
3855         return irinit;
3856 }
3857
3858 static ir_initializer_t *create_ir_initializer(
3859                 const initializer_t *initializer, type_t *type)
3860 {
3861         switch(initializer->kind) {
3862                 case INITIALIZER_STRING:
3863                         return create_ir_initializer_string(initializer, type);
3864
3865                 case INITIALIZER_LIST:
3866                         return create_ir_initializer_list(&initializer->list, type);
3867
3868                 case INITIALIZER_VALUE:
3869                         return create_ir_initializer_value(&initializer->value);
3870
3871                 case INITIALIZER_DESIGNATOR:
3872                         panic("unexpected designator initializer");
3873         }
3874         panic("unknown initializer");
3875 }
3876
3877 /** ANSI C §6.7.8:21: If there are fewer initializers [..] than there
3878  *  are elements [...] the remainder of the aggregate shall be initialized
3879  *  implicitly the same as objects that have static storage duration. */
3880 static void create_dynamic_null_initializer(ir_entity *entity, dbg_info *dbgi,
3881                 ir_node *base_addr)
3882 {
3883         /* for unions we must NOT do anything for null initializers */
3884         ir_type *owner = get_entity_owner(entity);
3885         if (is_Union_type(owner)) {
3886                 return;
3887         }
3888
3889         ir_type *ent_type = get_entity_type(entity);
3890         /* create sub-initializers for a compound type */
3891         if (is_compound_type(ent_type)) {
3892                 unsigned n_members = get_compound_n_members(ent_type);
3893                 for (unsigned n = 0; n < n_members; ++n) {
3894                         ir_entity *member = get_compound_member(ent_type, n);
3895                         ir_node   *addr   = new_d_simpleSel(dbgi, new_NoMem(), base_addr,
3896                                                                 member);
3897                         create_dynamic_null_initializer(member, dbgi, addr);
3898                 }
3899                 return;
3900         }
3901         if (is_Array_type(ent_type)) {
3902                 assert(has_array_upper_bound(ent_type, 0));
3903                 long n = get_array_upper_bound_int(ent_type, 0);
3904                 for (long i = 0; i < n; ++i) {
3905                         ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
3906                         ir_tarval *index_tv = new_tarval_from_long(i, mode_uint);
3907                         ir_node   *cnst     = new_d_Const(dbgi, index_tv);
3908                         ir_node   *in[1]    = { cnst };
3909                         ir_entity *arrent   = get_array_element_entity(ent_type);
3910                         ir_node   *addr     = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in,
3911                                                         arrent);
3912                         create_dynamic_null_initializer(arrent, dbgi, addr);
3913                 }
3914                 return;
3915         }
3916
3917         ir_mode *value_mode = get_type_mode(ent_type);
3918         ir_node *node       = new_Const(get_mode_null(value_mode));
3919
3920         /* is it a bitfield type? */
3921         if (is_Primitive_type(ent_type) &&
3922                         get_primitive_base_type(ent_type) != NULL) {
3923                 bitfield_store_to_firm(dbgi, entity, base_addr, node, false, false);
3924                 return;
3925         }
3926
3927         ir_node *mem    = get_store();
3928         ir_node *store  = new_d_Store(dbgi, mem, base_addr, node, cons_none);
3929         ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
3930         set_store(proj_m);
3931 }
3932
3933 static void create_dynamic_initializer_sub(ir_initializer_t *initializer,
3934                 ir_entity *entity, ir_type *type, dbg_info *dbgi, ir_node *base_addr)
3935 {
3936         switch(get_initializer_kind(initializer)) {
3937         case IR_INITIALIZER_NULL:
3938                 create_dynamic_null_initializer(entity, dbgi, base_addr);
3939                 return;
3940         case IR_INITIALIZER_CONST: {
3941                 ir_node *node     = get_initializer_const_value(initializer);
3942                 ir_type *ent_type = get_entity_type(entity);
3943
3944                 /* is it a bitfield type? */
3945                 if (is_Primitive_type(ent_type) &&
3946                                 get_primitive_base_type(ent_type) != NULL) {
3947                         bitfield_store_to_firm(dbgi, entity, base_addr, node, false, false);
3948                         return;
3949                 }
3950
3951                 assert(get_type_mode(type) == get_irn_mode(node));
3952                 ir_node *mem    = get_store();
3953                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, node, cons_none);
3954                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
3955                 set_store(proj_m);
3956                 return;
3957         }
3958         case IR_INITIALIZER_TARVAL: {
3959                 ir_tarval *tv       = get_initializer_tarval_value(initializer);
3960                 ir_node   *cnst     = new_d_Const(dbgi, tv);
3961                 ir_type   *ent_type = get_entity_type(entity);
3962
3963                 /* is it a bitfield type? */
3964                 if (is_Primitive_type(ent_type) &&
3965                                 get_primitive_base_type(ent_type) != NULL) {
3966                         bitfield_store_to_firm(dbgi, entity, base_addr, cnst, false, false);
3967                         return;
3968                 }
3969
3970                 assert(get_type_mode(type) == get_tarval_mode(tv));
3971                 ir_node *mem    = get_store();
3972                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, cnst, cons_none);
3973                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
3974                 set_store(proj_m);
3975                 return;
3976         }
3977         case IR_INITIALIZER_COMPOUND: {
3978                 assert(is_compound_type(type) || is_Array_type(type));
3979                 int n_members;
3980                 if (is_Array_type(type)) {
3981                         assert(has_array_upper_bound(type, 0));
3982                         n_members = get_array_upper_bound_int(type, 0);
3983                 } else {
3984                         n_members = get_compound_n_members(type);
3985                 }
3986
3987                 if (get_initializer_compound_n_entries(initializer)
3988                                 != (unsigned) n_members)
3989                         panic("initializer doesn't match compound type");
3990
3991                 for (int i = 0; i < n_members; ++i) {
3992                         ir_node   *addr;
3993                         ir_type   *irtype;
3994                         ir_entity *sub_entity;
3995                         if (is_Array_type(type)) {
3996                                 ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
3997                                 ir_tarval *index_tv = new_tarval_from_long(i, mode_uint);
3998                                 ir_node   *cnst     = new_d_Const(dbgi, index_tv);
3999                                 ir_node   *in[1]    = { cnst };
4000                                 irtype     = get_array_element_type(type);
4001                                 sub_entity = get_array_element_entity(type);
4002                                 addr       = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in,
4003                                                        sub_entity);
4004                         } else {
4005                                 sub_entity = get_compound_member(type, i);
4006                                 irtype     = get_entity_type(sub_entity);
4007                                 addr       = new_d_simpleSel(dbgi, new_NoMem(), base_addr,
4008                                                              sub_entity);
4009                         }
4010
4011                         ir_initializer_t *sub_init
4012                                 = get_initializer_compound_value(initializer, i);
4013
4014                         create_dynamic_initializer_sub(sub_init, sub_entity, irtype, dbgi,
4015                                                        addr);
4016                 }
4017                 return;
4018         }
4019         }
4020
4021         panic("invalid ir_initializer");
4022 }
4023
4024 static void create_dynamic_initializer(ir_initializer_t *initializer,
4025                 dbg_info *dbgi, ir_entity *entity)
4026 {
4027         ir_node *frame     = get_irg_frame(current_ir_graph);
4028         ir_node *base_addr = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
4029         ir_type *type      = get_entity_type(entity);
4030
4031         create_dynamic_initializer_sub(initializer, entity, type, dbgi, base_addr);
4032 }
4033
4034 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
4035                                      ir_entity *entity, type_t *type)
4036 {
4037         ir_node *memory = get_store();
4038         ir_node *nomem  = new_NoMem();
4039         ir_node *frame  = get_irg_frame(current_ir_graph);
4040         ir_node *addr   = new_d_simpleSel(dbgi, nomem, frame, entity);
4041
4042         if (initializer->kind == INITIALIZER_VALUE) {
4043                 initializer_value_t *initializer_value = &initializer->value;
4044
4045                 ir_node *value = expression_to_firm(initializer_value->value);
4046                 type = skip_typeref(type);
4047                 assign_value(dbgi, addr, type, value);
4048                 return;
4049         }
4050
4051         if (is_constant_initializer(initializer) == EXPR_CLASS_VARIABLE) {
4052                 ir_initializer_t *irinitializer
4053                         = create_ir_initializer(initializer, type);
4054
4055                 create_dynamic_initializer(irinitializer, dbgi, entity);
4056                 return;
4057         }
4058
4059         /* create a "template" entity which is copied to the entity on the stack */
4060         ir_entity *const init_entity
4061                 = create_initializer_entity(dbgi, initializer, type);
4062         ir_node *const src_addr = create_symconst(dbgi, init_entity);
4063         ir_type *const irtype   = get_ir_type(type);
4064         ir_node *const copyb    = new_d_CopyB(dbgi, memory, addr, src_addr, irtype);
4065
4066         ir_node *const copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
4067         set_store(copyb_mem);
4068 }
4069
4070 static void create_initializer_local_variable_entity(entity_t *entity)
4071 {
4072         assert(entity->kind == ENTITY_VARIABLE);
4073         initializer_t *initializer = entity->variable.initializer;
4074         dbg_info      *dbgi        = get_dbg_info(&entity->base.source_position);
4075         ir_entity     *irentity    = entity->variable.v.entity;
4076         type_t        *type        = entity->declaration.type;
4077
4078         create_local_initializer(initializer, dbgi, irentity, type);
4079 }
4080
4081 static void create_variable_initializer(entity_t *entity)
4082 {
4083         assert(entity->kind == ENTITY_VARIABLE);
4084         initializer_t *initializer = entity->variable.initializer;
4085         if (initializer == NULL)
4086                 return;
4087
4088         declaration_kind_t declaration_kind
4089                 = (declaration_kind_t) entity->declaration.kind;
4090         if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY) {
4091                 create_initializer_local_variable_entity(entity);
4092                 return;
4093         }
4094
4095         type_t            *type = entity->declaration.type;
4096         type_qualifiers_t  tq   = get_type_qualifier(type, true);
4097
4098         if (initializer->kind == INITIALIZER_VALUE) {
4099                 expression_t *      value     = initializer->value.value;
4100                 type_t       *const init_type = skip_typeref(value->base.type);
4101
4102                 if (!is_type_scalar(init_type)) {
4103                         /* skip convs */
4104                         while (value->kind == EXPR_UNARY_CAST)
4105                                 value = value->unary.value;
4106
4107                         if (value->kind != EXPR_COMPOUND_LITERAL)
4108                                 panic("expected non-scalar initializer to be a compound literal");
4109                         initializer = value->compound_literal.initializer;
4110                         goto have_initializer;
4111                 }
4112
4113                 ir_node  *      node = expression_to_firm(value);
4114                 dbg_info *const dbgi = get_dbg_info(&entity->base.source_position);
4115                 ir_mode  *const mode = get_ir_mode_storage(init_type);
4116                 node = create_conv(dbgi, node, mode);
4117
4118                 if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE) {
4119                         set_value(entity->variable.v.value_number, node);
4120                 } else {
4121                         assert(declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4122
4123                         ir_entity *irentity = entity->variable.v.entity;
4124
4125                         if (tq & TYPE_QUALIFIER_CONST
4126                                         && get_entity_owner(irentity) != get_tls_type()) {
4127                                 add_entity_linkage(irentity, IR_LINKAGE_CONSTANT);
4128                         }
4129                         set_atomic_ent_value(irentity, node);
4130                 }
4131         } else {
4132 have_initializer:
4133                 assert(declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY ||
4134                        declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4135
4136                 ir_entity        *irentity        = entity->variable.v.entity;
4137                 ir_initializer_t *irinitializer
4138                         = create_ir_initializer(initializer, type);
4139
4140                 if (tq & TYPE_QUALIFIER_CONST) {
4141                         add_entity_linkage(irentity, IR_LINKAGE_CONSTANT);
4142                 }
4143                 set_entity_initializer(irentity, irinitializer);
4144         }
4145 }
4146
4147 static void create_variable_length_array(entity_t *entity)
4148 {
4149         assert(entity->kind == ENTITY_VARIABLE);
4150         assert(entity->variable.initializer == NULL);
4151
4152         entity->declaration.kind    = DECLARATION_KIND_VARIABLE_LENGTH_ARRAY;
4153         entity->variable.v.vla_base = NULL;
4154
4155         /* TODO: record VLA somewhere so we create the free node when we leave
4156          * it's scope */
4157 }
4158
4159 static void allocate_variable_length_array(entity_t *entity)
4160 {
4161         assert(entity->kind == ENTITY_VARIABLE);
4162         assert(entity->variable.initializer == NULL);
4163         assert(currently_reachable());
4164
4165         dbg_info *dbgi      = get_dbg_info(&entity->base.source_position);
4166         type_t   *type      = entity->declaration.type;
4167         ir_type  *el_type   = get_ir_type(type->array.element_type);
4168
4169         /* make sure size_node is calculated */
4170         get_type_size_node(type);
4171         ir_node  *elems = type->array.size_node;
4172         ir_node  *mem   = get_store();
4173         ir_node  *alloc = new_d_Alloc(dbgi, mem, elems, el_type, stack_alloc);
4174
4175         ir_node  *proj_m = new_d_Proj(dbgi, alloc, mode_M, pn_Alloc_M);
4176         ir_node  *addr   = new_d_Proj(dbgi, alloc, mode_P_data, pn_Alloc_res);
4177         set_store(proj_m);
4178
4179         assert(entity->declaration.kind == DECLARATION_KIND_VARIABLE_LENGTH_ARRAY);
4180         entity->variable.v.vla_base = addr;
4181 }
4182
4183 static bool var_needs_entity(variable_t const *const var)
4184 {
4185         if (var->address_taken)
4186                 return true;
4187         type_t *const type = skip_typeref(var->base.type);
4188         return !is_type_scalar(type) || type->base.qualifiers & TYPE_QUALIFIER_VOLATILE;
4189 }
4190
4191 /**
4192  * Creates a Firm local variable from a declaration.
4193  */
4194 static void create_local_variable(entity_t *entity)
4195 {
4196         assert(entity->kind == ENTITY_VARIABLE);
4197         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4198
4199         if (!var_needs_entity(&entity->variable)) {
4200                 entity->declaration.kind        = DECLARATION_KIND_LOCAL_VARIABLE;
4201                 entity->variable.v.value_number = next_value_number_function;
4202                 set_irg_loc_description(current_ir_graph, next_value_number_function, entity);
4203                 ++next_value_number_function;
4204                 return;
4205         }
4206
4207         /* is it a variable length array? */
4208         type_t *const type = skip_typeref(entity->declaration.type);
4209         if (is_type_array(type) && !type->array.size_constant) {
4210                 create_variable_length_array(entity);
4211                 return;
4212         }
4213
4214         ir_type *const frame_type = get_irg_frame_type(current_ir_graph);
4215         create_variable_entity(entity, DECLARATION_KIND_LOCAL_VARIABLE_ENTITY, frame_type);
4216 }
4217
4218 static void create_local_static_variable(entity_t *entity)
4219 {
4220         assert(entity->kind == ENTITY_VARIABLE);
4221         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4222
4223         type_t   *type           = skip_typeref(entity->declaration.type);
4224         ir_type  *const var_type = entity->variable.thread_local ?
4225                 get_tls_type() : get_glob_type();
4226         ir_type  *const irtype   = get_ir_type(type);
4227         dbg_info *const dbgi     = get_dbg_info(&entity->base.source_position);
4228
4229         size_t l = strlen(entity->base.symbol->string);
4230         char   buf[l + sizeof(".%u")];
4231         snprintf(buf, sizeof(buf), "%s.%%u", entity->base.symbol->string);
4232         ident     *const id       = id_unique(buf);
4233         ir_entity *const irentity = new_d_entity(var_type, id, irtype, dbgi);
4234
4235         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
4236                 set_entity_volatility(irentity, volatility_is_volatile);
4237         }
4238
4239         entity->declaration.kind  = DECLARATION_KIND_GLOBAL_VARIABLE;
4240         entity->variable.v.entity = irentity;
4241
4242         set_entity_ld_ident(irentity, id);
4243         set_entity_visibility(irentity, ir_visibility_local);
4244
4245         if (entity->variable.initializer == NULL) {
4246                 ir_initializer_t *null_init = get_initializer_null();
4247                 set_entity_initializer(irentity, null_init);
4248         }
4249
4250         PUSH_IRG(get_const_code_irg());
4251         create_variable_initializer(entity);
4252         POP_IRG();
4253 }
4254
4255
4256
4257 static ir_node *return_statement_to_firm(return_statement_t *statement)
4258 {
4259         if (!currently_reachable())
4260                 return NULL;
4261
4262         dbg_info *const dbgi = get_dbg_info(&statement->base.source_position);
4263         type_t   *const type = skip_typeref(current_function_entity->declaration.type->function.return_type);
4264         ir_node  *      res  = statement->value ? expression_to_firm(statement->value) : NULL;
4265
4266         int in_len;
4267         if (!is_type_void(type)) {
4268                 ir_mode *const mode = get_ir_mode_storage(type);
4269                 if (res) {
4270                         res = create_conv(dbgi, res, mode);
4271                 } else {
4272                         res = new_Unknown(mode);
4273                 }
4274                 in_len = 1;
4275         } else {
4276                 in_len = 0;
4277         }
4278
4279         ir_node *const in[1] = { res };
4280         ir_node *const store = get_store();
4281         ir_node *const ret   = new_d_Return(dbgi, store, in_len, in);
4282
4283         ir_node *end_block = get_irg_end_block(current_ir_graph);
4284         add_immBlock_pred(end_block, ret);
4285
4286         set_unreachable_now();
4287         return NULL;
4288 }
4289
4290 static ir_node *expression_statement_to_firm(expression_statement_t *statement)
4291 {
4292         if (!currently_reachable())
4293                 return NULL;
4294
4295         return expression_to_firm(statement->expression);
4296 }
4297
4298 static void create_local_declarations(entity_t*);
4299
4300 static ir_node *compound_statement_to_firm(compound_statement_t *compound)
4301 {
4302         create_local_declarations(compound->scope.entities);
4303
4304         ir_node     *result    = NULL;
4305         statement_t *statement = compound->statements;
4306         for ( ; statement != NULL; statement = statement->base.next) {
4307                 result = statement_to_firm(statement);
4308         }
4309
4310         return result;
4311 }
4312
4313 static void create_global_variable(entity_t *entity)
4314 {
4315         ir_linkage          linkage    = IR_LINKAGE_DEFAULT;
4316         ir_visibility       visibility = ir_visibility_external;
4317         storage_class_tag_t storage
4318                 = (storage_class_tag_t)entity->declaration.storage_class;
4319         decl_modifiers_t    modifiers  = entity->declaration.modifiers;
4320         assert(entity->kind == ENTITY_VARIABLE);
4321
4322         switch (storage) {
4323         case STORAGE_CLASS_EXTERN: visibility = ir_visibility_external; break;
4324         case STORAGE_CLASS_STATIC: visibility = ir_visibility_local;    break;
4325         case STORAGE_CLASS_NONE:   visibility = ir_visibility_external; break;
4326         case STORAGE_CLASS_TYPEDEF:
4327         case STORAGE_CLASS_AUTO:
4328         case STORAGE_CLASS_REGISTER:
4329                 panic("invalid storage class for global var");
4330         }
4331
4332         /* "common" symbols */
4333         if (storage == STORAGE_CLASS_NONE
4334             && entity->variable.initializer == NULL
4335             && !entity->variable.thread_local
4336             && (modifiers & DM_WEAK) == 0) {
4337                 linkage |= IR_LINKAGE_MERGE;
4338         }
4339
4340         ir_type *var_type = get_glob_type();
4341         if (entity->variable.thread_local) {
4342                 var_type = get_tls_type();
4343         }
4344         create_variable_entity(entity, DECLARATION_KIND_GLOBAL_VARIABLE, var_type);
4345         ir_entity *irentity = entity->variable.v.entity;
4346         add_entity_linkage(irentity, linkage);
4347         set_entity_visibility(irentity, visibility);
4348         if (entity->variable.initializer == NULL
4349             && storage != STORAGE_CLASS_EXTERN) {
4350                 ir_initializer_t *null_init = get_initializer_null();
4351                 set_entity_initializer(irentity, null_init);
4352         }
4353 }
4354
4355 static void create_local_declaration(entity_t *entity)
4356 {
4357         assert(is_declaration(entity));
4358
4359         /* construct type */
4360         (void) get_ir_type(entity->declaration.type);
4361         if (entity->base.symbol == NULL) {
4362                 return;
4363         }
4364
4365         switch ((storage_class_tag_t) entity->declaration.storage_class) {
4366         case STORAGE_CLASS_STATIC:
4367                 if (entity->kind == ENTITY_FUNCTION) {
4368                         (void)get_function_entity(entity, NULL);
4369                 } else {
4370                         create_local_static_variable(entity);
4371                 }
4372                 return;
4373         case STORAGE_CLASS_EXTERN:
4374                 if (entity->kind == ENTITY_FUNCTION) {
4375                         assert(entity->function.body == NULL);
4376                         (void)get_function_entity(entity, NULL);
4377                 } else {
4378                         create_global_variable(entity);
4379                         create_variable_initializer(entity);
4380                 }
4381                 return;
4382         case STORAGE_CLASS_NONE:
4383         case STORAGE_CLASS_AUTO:
4384         case STORAGE_CLASS_REGISTER:
4385                 if (entity->kind == ENTITY_FUNCTION) {
4386                         if (entity->function.body != NULL) {
4387                                 ir_type *owner = get_irg_frame_type(current_ir_graph);
4388                                 (void)get_function_entity(entity, owner);
4389                                 entity->declaration.kind = DECLARATION_KIND_INNER_FUNCTION;
4390                                 enqueue_inner_function(entity);
4391                         } else {
4392                                 (void)get_function_entity(entity, NULL);
4393                         }
4394                 } else {
4395                         create_local_variable(entity);
4396                 }
4397                 return;
4398         case STORAGE_CLASS_TYPEDEF:
4399                 break;
4400         }
4401         panic("invalid storage class");
4402 }
4403
4404 static void create_local_declarations(entity_t *e)
4405 {
4406         for (; e; e = e->base.next) {
4407                 if (is_declaration(e))
4408                         create_local_declaration(e);
4409         }
4410 }
4411
4412 static void initialize_local_declaration(entity_t *entity)
4413 {
4414         if (entity->base.symbol == NULL)
4415                 return;
4416
4417         // no need to emit code in dead blocks
4418         if (entity->declaration.storage_class != STORAGE_CLASS_STATIC
4419                         && !currently_reachable())
4420                 return;
4421
4422         switch ((declaration_kind_t) entity->declaration.kind) {
4423         case DECLARATION_KIND_LOCAL_VARIABLE:
4424         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY:
4425                 create_variable_initializer(entity);
4426                 return;
4427
4428         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
4429                 allocate_variable_length_array(entity);
4430                 return;
4431
4432         case DECLARATION_KIND_COMPOUND_MEMBER:
4433         case DECLARATION_KIND_GLOBAL_VARIABLE:
4434         case DECLARATION_KIND_FUNCTION:
4435         case DECLARATION_KIND_INNER_FUNCTION:
4436                 return;
4437
4438         case DECLARATION_KIND_PARAMETER:
4439         case DECLARATION_KIND_PARAMETER_ENTITY:
4440                 panic("can't initialize parameters");
4441
4442         case DECLARATION_KIND_UNKNOWN:
4443                 panic("can't initialize unknown declaration");
4444         }
4445         panic("invalid declaration kind");
4446 }
4447
4448 static ir_node *declaration_statement_to_firm(declaration_statement_t *statement)
4449 {
4450         entity_t *entity = statement->declarations_begin;
4451         if (entity == NULL)
4452                 return NULL;
4453
4454         entity_t *const last = statement->declarations_end;
4455         for ( ;; entity = entity->base.next) {
4456                 if (is_declaration(entity)) {
4457                         initialize_local_declaration(entity);
4458                 } else if (entity->kind == ENTITY_TYPEDEF) {
4459                         /* §6.7.7:3  Any array size expressions associated with variable length
4460                          * array declarators are evaluated each time the declaration of the
4461                          * typedef name is reached in the order of execution. */
4462                         type_t *const type = skip_typeref(entity->typedefe.type);
4463                         if (is_type_array(type) && type->array.is_vla)
4464                                 get_vla_size(&type->array);
4465                 }
4466                 if (entity == last)
4467                         break;
4468         }
4469
4470         return NULL;
4471 }
4472
4473 static ir_node *if_statement_to_firm(if_statement_t *statement)
4474 {
4475         create_local_declarations(statement->scope.entities);
4476
4477         /* Create the condition. */
4478         jump_target true_target;
4479         jump_target false_target;
4480         init_jump_target(&true_target,  NULL);
4481         init_jump_target(&false_target, NULL);
4482         if (currently_reachable())
4483                 create_condition_evaluation(statement->condition, &true_target, &false_target);
4484
4485         jump_target exit_target;
4486         init_jump_target(&exit_target, NULL);
4487
4488         /* Create the true statement. */
4489         enter_jump_target(&true_target);
4490         statement_to_firm(statement->true_statement);
4491         jump_to_target(&exit_target);
4492
4493         /* Create the false statement. */
4494         enter_jump_target(&false_target);
4495         if (statement->false_statement)
4496                 statement_to_firm(statement->false_statement);
4497         jump_to_target(&exit_target);
4498
4499         enter_jump_target(&exit_target);
4500         return NULL;
4501 }
4502
4503 static ir_node *do_while_statement_to_firm(do_while_statement_t *statement)
4504 {
4505         create_local_declarations(statement->scope.entities);
4506
4507         PUSH_BREAK(NULL);
4508         PUSH_CONTINUE(NULL);
4509
4510         expression_t *const cond = statement->condition;
4511         /* Avoid an explicit body block in case of do ... while (0);. */
4512         if (is_constant_expression(cond) == EXPR_CLASS_CONSTANT && !fold_constant_to_bool(cond)) {
4513                 /* do ... while (0);. */
4514                 statement_to_firm(statement->body);
4515                 jump_to_target(&continue_target);
4516                 enter_jump_target(&continue_target);
4517                 jump_to_target(&break_target);
4518         } else {
4519                 jump_target body_target;
4520                 init_jump_target(&body_target, NULL);
4521                 jump_to_target(&body_target);
4522                 enter_immature_jump_target(&body_target);
4523                 statement_to_firm(statement->body);
4524                 jump_to_target(&continue_target);
4525                 if (enter_jump_target(&continue_target))
4526                         create_condition_evaluation(statement->condition, &body_target, &break_target);
4527                 enter_jump_target(&body_target);
4528         }
4529         enter_jump_target(&break_target);
4530
4531         POP_CONTINUE();
4532         POP_BREAK();
4533         return NULL;
4534 }
4535
4536 static ir_node *for_statement_to_firm(for_statement_t *statement)
4537 {
4538         create_local_declarations(statement->scope.entities);
4539
4540         if (currently_reachable()) {
4541                 entity_t *entity = statement->scope.entities;
4542                 for ( ; entity != NULL; entity = entity->base.next) {
4543                         if (!is_declaration(entity))
4544                                 continue;
4545
4546                         initialize_local_declaration(entity);
4547                 }
4548
4549                 if (statement->initialisation != NULL) {
4550                         expression_to_firm(statement->initialisation);
4551                 }
4552         }
4553
4554         /* Create the header block */
4555         jump_target header_target;
4556         init_jump_target(&header_target, NULL);
4557         jump_to_target(&header_target);
4558         enter_immature_jump_target(&header_target);
4559
4560         expression_t *const step = statement->step;
4561         PUSH_BREAK(NULL);
4562         PUSH_CONTINUE(step ? NULL : header_target.block);
4563
4564         /* Create the condition. */
4565         expression_t *const cond = statement->condition;
4566         if (cond && (is_constant_expression(cond) != EXPR_CLASS_CONSTANT || !fold_constant_to_bool(cond))) {
4567                 jump_target body_target;
4568                 init_jump_target(&body_target, NULL);
4569                 create_condition_evaluation(cond, &body_target, &break_target);
4570                 enter_jump_target(&body_target);
4571         } else {
4572                 /* for-ever. */
4573                 keep_alive(header_target.block);
4574                 keep_all_memory(header_target.block);
4575         }
4576
4577         /* Create the loop body. */
4578         statement_to_firm(statement->body);
4579         jump_to_target(&continue_target);
4580
4581         /* Create the step code. */
4582         if (step && enter_jump_target(&continue_target)) {
4583                 expression_to_firm(step);
4584                 jump_to_target(&header_target);
4585         }
4586
4587         enter_jump_target(&header_target);
4588         enter_jump_target(&break_target);
4589
4590         POP_CONTINUE();
4591         POP_BREAK();
4592         return NULL;
4593 }
4594
4595 static ir_switch_table *create_switch_table(const switch_statement_t *statement)
4596 {
4597         /* determine number of cases */
4598         size_t n_cases = 0;
4599         for (case_label_statement_t *l = statement->first_case; l != NULL;
4600              l = l->next) {
4601                 /* default case */
4602                 if (l->expression == NULL)
4603                         continue;
4604                 if (l->is_empty_range)
4605                         continue;
4606                 ++n_cases;
4607         }
4608
4609         ir_switch_table *res = ir_new_switch_table(current_ir_graph, n_cases);
4610         size_t           i   = 0;
4611         for (case_label_statement_t *l = statement->first_case; l != NULL;
4612              l = l->next) {
4613             if (l->expression == NULL) {
4614                         l->pn = pn_Switch_default;
4615                         continue;
4616                 }
4617                 if (l->is_empty_range)
4618                         continue;
4619                 ir_tarval *min = l->first_case;
4620                 ir_tarval *max = l->last_case;
4621                 long       pn  = (long) i+1;
4622                 ir_switch_table_set(res, i++, min, max, pn);
4623                 l->pn = pn;
4624         }
4625         return res;
4626 }
4627
4628 static ir_node *switch_statement_to_firm(switch_statement_t *statement)
4629 {
4630         dbg_info *dbgi        = get_dbg_info(&statement->base.source_position);
4631         ir_node  *switch_node = NULL;
4632
4633         if (currently_reachable()) {
4634                 ir_node *expression = expression_to_firm(statement->expression);
4635                 ir_switch_table *table = create_switch_table(statement);
4636                 unsigned n_outs = (unsigned)ir_switch_table_get_n_entries(table) + 1;
4637
4638                 switch_node = new_d_Switch(dbgi, expression, n_outs, table);
4639         }
4640
4641         set_unreachable_now();
4642
4643         PUSH_BREAK(NULL);
4644         ir_node *const old_switch            = current_switch;
4645         const bool     old_saw_default_label = saw_default_label;
4646         saw_default_label                    = false;
4647         current_switch                       = switch_node;
4648
4649         statement_to_firm(statement->body);
4650         jump_to_target(&break_target);
4651
4652         if (!saw_default_label && switch_node) {
4653                 ir_node *proj = new_d_Proj(dbgi, switch_node, mode_X, pn_Switch_default);
4654                 add_pred_to_jump_target(&break_target, proj);
4655         }
4656
4657         enter_jump_target(&break_target);
4658
4659         assert(current_switch == switch_node);
4660         current_switch    = old_switch;
4661         saw_default_label = old_saw_default_label;
4662         POP_BREAK();
4663         return NULL;
4664 }
4665
4666 static ir_node *case_label_to_firm(const case_label_statement_t *statement)
4667 {
4668         if (current_switch != NULL && !statement->is_empty_range) {
4669                 jump_target case_target;
4670                 init_jump_target(&case_target, NULL);
4671
4672                 /* Fallthrough from previous case */
4673                 jump_to_target(&case_target);
4674
4675                 ir_node *const proj = new_Proj(current_switch, mode_X, statement->pn);
4676                 add_pred_to_jump_target(&case_target, proj);
4677                 if (statement->expression == NULL)
4678                         saw_default_label = true;
4679
4680                 enter_jump_target(&case_target);
4681         }
4682
4683         return statement_to_firm(statement->statement);
4684 }
4685
4686 static ir_node *label_to_firm(const label_statement_t *statement)
4687 {
4688         label_t *const label = statement->label;
4689         prepare_label_target(label);
4690         jump_to_target(&label->target);
4691         if (--label->n_users == 0) {
4692                 enter_jump_target(&label->target);
4693         } else {
4694                 enter_immature_jump_target(&label->target);
4695                 keep_alive(label->target.block);
4696                 keep_all_memory(label->target.block);
4697         }
4698
4699         return statement_to_firm(statement->statement);
4700 }
4701
4702 static ir_node *goto_statement_to_firm(goto_statement_t *const stmt)
4703 {
4704         label_t *const label = stmt->label;
4705         prepare_label_target(label);
4706         jump_to_target(&label->target);
4707         if (--label->n_users == 0)
4708                 enter_jump_target(&label->target);
4709         set_unreachable_now();
4710         return NULL;
4711 }
4712
4713 static ir_node *computed_goto_to_firm(computed_goto_statement_t const *const statement)
4714 {
4715         if (currently_reachable()) {
4716                 ir_node *const op = expression_to_firm(statement->expression);
4717                 ARR_APP1(ir_node*, ijmp_ops, op);
4718                 jump_to_target(&ijmp_target);
4719                 set_unreachable_now();
4720         }
4721         return NULL;
4722 }
4723
4724 static ir_node *asm_statement_to_firm(const asm_statement_t *statement)
4725 {
4726         bool           needs_memory = statement->is_volatile;
4727         size_t         n_clobbers   = 0;
4728         asm_clobber_t *clobber      = statement->clobbers;
4729         for ( ; clobber != NULL; clobber = clobber->next) {
4730                 const char *clobber_str = clobber->clobber.begin;
4731
4732                 if (!be_is_valid_clobber(clobber_str)) {
4733                         errorf(&statement->base.source_position,
4734                                    "invalid clobber '%s' specified", clobber->clobber);
4735                         continue;
4736                 }
4737
4738                 if (streq(clobber_str, "memory")) {
4739                         needs_memory = true;
4740                         continue;
4741                 }
4742
4743                 ident *id = new_id_from_str(clobber_str);
4744                 obstack_ptr_grow(&asm_obst, id);
4745                 ++n_clobbers;
4746         }
4747         assert(obstack_object_size(&asm_obst) == n_clobbers * sizeof(ident*));
4748         ident **clobbers = NULL;
4749         if (n_clobbers > 0) {
4750                 clobbers = obstack_finish(&asm_obst);
4751         }
4752
4753         size_t n_inputs  = 0;
4754         asm_argument_t *argument = statement->inputs;
4755         for ( ; argument != NULL; argument = argument->next)
4756                 n_inputs++;
4757         size_t n_outputs = 0;
4758         argument = statement->outputs;
4759         for ( ; argument != NULL; argument = argument->next)
4760                 n_outputs++;
4761
4762         unsigned next_pos = 0;
4763
4764         ir_node *ins[n_inputs + n_outputs + 1];
4765         size_t   in_size = 0;
4766
4767         ir_asm_constraint tmp_in_constraints[n_outputs];
4768
4769         const expression_t *out_exprs[n_outputs];
4770         ir_node            *out_addrs[n_outputs];
4771         size_t              out_size = 0;
4772
4773         argument = statement->outputs;
4774         for ( ; argument != NULL; argument = argument->next) {
4775                 const char *constraints = argument->constraints.begin;
4776                 asm_constraint_flags_t asm_flags
4777                         = be_parse_asm_constraints(constraints);
4778
4779                 {
4780                         source_position_t const *const pos = &statement->base.source_position;
4781                         if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
4782                                 warningf(WARN_OTHER, pos, "some constraints in '%s' are not supported", constraints);
4783                         }
4784                         if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
4785                                 errorf(pos, "some constraints in '%s' are invalid", constraints);
4786                                 continue;
4787                         }
4788                         if (! (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE)) {
4789                                 errorf(pos, "no write flag specified for output constraints '%s'", constraints);
4790                                 continue;
4791                         }
4792                 }
4793
4794                 unsigned pos = next_pos++;
4795                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
4796                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
4797                         expression_t *expr = argument->expression;
4798                         ir_node      *addr = expression_to_addr(expr);
4799                         /* in+output, construct an artifical same_as constraint on the
4800                          * input */
4801                         if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_READ) {
4802                                 char     buf[64];
4803                                 ir_node *value = get_value_from_lvalue(expr, addr);
4804
4805                                 snprintf(buf, sizeof(buf), "%u", (unsigned) out_size);
4806
4807                                 ir_asm_constraint constraint;
4808                                 constraint.pos              = pos;
4809                                 constraint.constraint       = new_id_from_str(buf);
4810                                 constraint.mode             = get_ir_mode_storage(expr->base.type);
4811                                 tmp_in_constraints[in_size] = constraint;
4812                                 ins[in_size] = value;
4813
4814                                 ++in_size;
4815                         }
4816
4817                         out_exprs[out_size] = expr;
4818                         out_addrs[out_size] = addr;
4819                         ++out_size;
4820                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
4821                         /* pure memory ops need no input (but we have to make sure we
4822                          * attach to the memory) */
4823                         assert(! (asm_flags &
4824                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
4825                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
4826                         needs_memory = true;
4827
4828                         /* we need to attach the address to the inputs */
4829                         expression_t *expr = argument->expression;
4830
4831                         ir_asm_constraint constraint;
4832                         constraint.pos              = pos;
4833                         constraint.constraint       = new_id_from_str(constraints);
4834                         constraint.mode             = mode_M;
4835                         tmp_in_constraints[in_size] = constraint;
4836
4837                         ins[in_size] = expression_to_addr(expr);
4838                         ++in_size;
4839                         continue;
4840                 } else {
4841                         errorf(&statement->base.source_position,
4842                                "only modifiers but no place set in constraints '%s'",
4843                                constraints);
4844                         continue;
4845                 }
4846
4847                 ir_asm_constraint constraint;
4848                 constraint.pos        = pos;
4849                 constraint.constraint = new_id_from_str(constraints);
4850                 constraint.mode       = get_ir_mode_storage(argument->expression->base.type);
4851
4852                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
4853         }
4854         assert(obstack_object_size(&asm_obst)
4855                         == out_size * sizeof(ir_asm_constraint));
4856         ir_asm_constraint *output_constraints = obstack_finish(&asm_obst);
4857
4858
4859         obstack_grow(&asm_obst, tmp_in_constraints,
4860                      in_size * sizeof(tmp_in_constraints[0]));
4861         /* find and count input and output arguments */
4862         argument = statement->inputs;
4863         for ( ; argument != NULL; argument = argument->next) {
4864                 const char *constraints = argument->constraints.begin;
4865                 asm_constraint_flags_t asm_flags
4866                         = be_parse_asm_constraints(constraints);
4867
4868                 if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
4869                         errorf(&statement->base.source_position,
4870                                "some constraints in '%s' are not supported", constraints);
4871                         continue;
4872                 }
4873                 if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
4874                         errorf(&statement->base.source_position,
4875                                "some constraints in '%s' are invalid", constraints);
4876                         continue;
4877                 }
4878                 if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE) {
4879                         errorf(&statement->base.source_position,
4880                                "write flag specified for input constraints '%s'",
4881                                constraints);
4882                         continue;
4883                 }
4884
4885                 ir_node *input;
4886                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
4887                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
4888                         /* we can treat this as "normal" input */
4889                         input = expression_to_firm(argument->expression);
4890                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
4891                         /* pure memory ops need no input (but we have to make sure we
4892                          * attach to the memory) */
4893                         assert(! (asm_flags &
4894                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
4895                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
4896                         needs_memory = true;
4897                         input = expression_to_addr(argument->expression);
4898                 } else {
4899                         errorf(&statement->base.source_position,
4900                                "only modifiers but no place set in constraints '%s'",
4901                                constraints);
4902                         continue;
4903                 }
4904
4905                 ir_asm_constraint constraint;
4906                 constraint.pos        = next_pos++;
4907                 constraint.constraint = new_id_from_str(constraints);
4908                 constraint.mode       = get_irn_mode(input);
4909
4910                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
4911                 ins[in_size++] = input;
4912         }
4913
4914         ir_node *mem = needs_memory ? get_store() : new_NoMem();
4915         assert(obstack_object_size(&asm_obst)
4916                         == in_size * sizeof(ir_asm_constraint));
4917         ir_asm_constraint *input_constraints = obstack_finish(&asm_obst);
4918
4919         /* create asm node */
4920         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
4921
4922         ident *asm_text = new_id_from_str(statement->asm_text.begin);
4923
4924         ir_node *node = new_d_ASM(dbgi, mem, in_size, ins, input_constraints,
4925                                   out_size, output_constraints,
4926                                   n_clobbers, clobbers, asm_text);
4927
4928         if (statement->is_volatile) {
4929                 set_irn_pinned(node, op_pin_state_pinned);
4930         } else {
4931                 set_irn_pinned(node, op_pin_state_floats);
4932         }
4933
4934         /* create output projs & connect them */
4935         if (needs_memory) {
4936                 ir_node *projm = new_Proj(node, mode_M, out_size);
4937                 set_store(projm);
4938         }
4939
4940         size_t i;
4941         for (i = 0; i < out_size; ++i) {
4942                 const expression_t *out_expr = out_exprs[i];
4943                 long                pn       = i;
4944                 ir_mode            *mode     = get_ir_mode_storage(out_expr->base.type);
4945                 ir_node            *proj     = new_Proj(node, mode, pn);
4946                 ir_node            *addr     = out_addrs[i];
4947
4948                 set_value_for_expression_addr(out_expr, proj, addr);
4949         }
4950
4951         return NULL;
4952 }
4953
4954 static ir_node *ms_try_statement_to_firm(ms_try_statement_t *statement)
4955 {
4956         statement_to_firm(statement->try_statement);
4957         source_position_t const *const pos = &statement->base.source_position;
4958         warningf(WARN_OTHER, pos, "structured exception handling ignored");
4959         return NULL;
4960 }
4961
4962 static ir_node *leave_statement_to_firm(leave_statement_t *statement)
4963 {
4964         errorf(&statement->base.source_position, "__leave not supported yet");
4965         return NULL;
4966 }
4967
4968 /**
4969  * Transform a statement.
4970  */
4971 static ir_node *statement_to_firm(statement_t *const stmt)
4972 {
4973 #ifndef NDEBUG
4974         assert(!stmt->base.transformed);
4975         stmt->base.transformed = true;
4976 #endif
4977
4978         switch (stmt->kind) {
4979         case STATEMENT_ASM:           return asm_statement_to_firm(        &stmt->asms);
4980         case STATEMENT_CASE_LABEL:    return case_label_to_firm(           &stmt->case_label);
4981         case STATEMENT_COMPOUND:      return compound_statement_to_firm(   &stmt->compound);
4982         case STATEMENT_COMPUTED_GOTO: return computed_goto_to_firm(        &stmt->computed_goto);
4983         case STATEMENT_DECLARATION:   return declaration_statement_to_firm(&stmt->declaration);
4984         case STATEMENT_DO_WHILE:      return do_while_statement_to_firm(   &stmt->do_while);
4985         case STATEMENT_EMPTY:         return NULL; /* nothing */
4986         case STATEMENT_EXPRESSION:    return expression_statement_to_firm( &stmt->expression);
4987         case STATEMENT_FOR:           return for_statement_to_firm(        &stmt->fors);
4988         case STATEMENT_GOTO:          return goto_statement_to_firm(       &stmt->gotos);
4989         case STATEMENT_IF:            return if_statement_to_firm(         &stmt->ifs);
4990         case STATEMENT_LABEL:         return label_to_firm(                &stmt->label);
4991         case STATEMENT_LEAVE:         return leave_statement_to_firm(      &stmt->leave);
4992         case STATEMENT_MS_TRY:        return ms_try_statement_to_firm(     &stmt->ms_try);
4993         case STATEMENT_RETURN:        return return_statement_to_firm(     &stmt->returns);
4994         case STATEMENT_SWITCH:        return switch_statement_to_firm(     &stmt->switchs);
4995
4996         {
4997                 jump_target *tgt;
4998         case STATEMENT_BREAK:    tgt = &break_target;    goto jump;
4999         case STATEMENT_CONTINUE: tgt = &continue_target; goto jump;
5000 jump:
5001                 jump_to_target(tgt);
5002                 set_unreachable_now();
5003                 return NULL;
5004         }
5005
5006         case STATEMENT_ERROR: panic("error statement");
5007         }
5008         panic("statement not implemented");
5009 }
5010
5011 static int count_local_variables(const entity_t *entity,
5012                                  const entity_t *const last)
5013 {
5014         int count = 0;
5015         entity_t const *const end = last != NULL ? last->base.next : NULL;
5016         for (; entity != end; entity = entity->base.next) {
5017                 if ((entity->kind == ENTITY_VARIABLE || entity->kind == ENTITY_PARAMETER) &&
5018                     !var_needs_entity(&entity->variable))
5019                         ++count;
5020         }
5021         return count;
5022 }
5023
5024 static void count_local_variables_in_stmt(statement_t *stmt, void *const env)
5025 {
5026         int *const count = env;
5027
5028         switch (stmt->kind) {
5029         case STATEMENT_DECLARATION: {
5030                 const declaration_statement_t *const decl_stmt = &stmt->declaration;
5031                 *count += count_local_variables(decl_stmt->declarations_begin,
5032                                 decl_stmt->declarations_end);
5033                 break;
5034         }
5035
5036         case STATEMENT_FOR:
5037                 *count += count_local_variables(stmt->fors.scope.entities, NULL);
5038                 break;
5039
5040         default:
5041                 break;
5042         }
5043 }
5044
5045 /**
5046  * Return the number of local (alias free) variables used by a function.
5047  */
5048 static int get_function_n_local_vars(entity_t *entity)
5049 {
5050         const function_t *function = &entity->function;
5051         int count = 0;
5052
5053         /* count parameters */
5054         count += count_local_variables(function->parameters.entities, NULL);
5055
5056         /* count local variables declared in body */
5057         walk_statements(function->body, count_local_variables_in_stmt, &count);
5058         return count;
5059 }
5060
5061 /**
5062  * Build Firm code for the parameters of a function.
5063  */
5064 static void initialize_function_parameters(entity_t *entity)
5065 {
5066         assert(entity->kind == ENTITY_FUNCTION);
5067         ir_graph *irg             = current_ir_graph;
5068         ir_node  *args            = get_irg_args(irg);
5069         int       n               = 0;
5070         ir_type  *function_irtype;
5071
5072         if (entity->function.need_closure) {
5073                 /* add an extra parameter for the static link */
5074                 entity->function.static_link = new_r_Proj(args, mode_P_data, 0);
5075                 ++n;
5076
5077                 /* Matze: IMO this is wrong, nested functions should have an own
5078                  * type and not rely on strange parameters... */
5079                 function_irtype = create_method_type(&entity->declaration.type->function, true);
5080         } else {
5081                 function_irtype = get_ir_type(entity->declaration.type);
5082         }
5083
5084
5085
5086         entity_t *parameter = entity->function.parameters.entities;
5087         for ( ; parameter != NULL; parameter = parameter->base.next, ++n) {
5088                 if (parameter->kind != ENTITY_PARAMETER)
5089                         continue;
5090
5091                 assert(parameter->declaration.kind == DECLARATION_KIND_UNKNOWN);
5092                 type_t *type = skip_typeref(parameter->declaration.type);
5093
5094                 dbg_info *const dbgi         = get_dbg_info(&parameter->base.source_position);
5095                 ir_type  *const param_irtype = get_method_param_type(function_irtype, n);
5096                 if (var_needs_entity(&parameter->variable)) {
5097                         ir_type   *frame_type = get_irg_frame_type(irg);
5098                         ir_entity *param
5099                                 = new_d_parameter_entity(frame_type, n, param_irtype, dbgi);
5100                         parameter->declaration.kind  = DECLARATION_KIND_PARAMETER_ENTITY;
5101                         parameter->variable.v.entity = param;
5102                         continue;
5103                 }
5104
5105                 ir_mode *param_mode = get_type_mode(param_irtype);
5106                 long     pn         = n;
5107                 ir_node *value      = new_rd_Proj(dbgi, args, param_mode, pn);
5108
5109                 ir_mode *mode = get_ir_mode_storage(type);
5110                 value = create_conv(NULL, value, mode);
5111
5112                 parameter->declaration.kind        = DECLARATION_KIND_PARAMETER;
5113                 parameter->variable.v.value_number = next_value_number_function;
5114                 set_irg_loc_description(current_ir_graph, next_value_number_function,
5115                                         parameter);
5116                 ++next_value_number_function;
5117
5118                 set_value(parameter->variable.v.value_number, value);
5119         }
5120 }
5121
5122 static void add_function_pointer(ir_type *segment, ir_entity *method,
5123                                  const char *unique_template)
5124 {
5125         ir_type   *method_type  = get_entity_type(method);
5126         ir_type   *ptr_type     = new_type_pointer(method_type);
5127
5128         /* these entities don't really have a name but firm only allows
5129          * "" in ld_ident.
5130          * Note that we mustn't give these entities a name since for example
5131          * Mach-O doesn't allow them. */
5132         ident     *ide          = id_unique(unique_template);
5133         ir_entity *ptr          = new_entity(segment, ide, ptr_type);
5134         ir_graph  *irg          = get_const_code_irg();
5135         ir_node   *val          = new_rd_SymConst_addr_ent(NULL, irg, mode_P_code,
5136                                                            method);
5137
5138         set_entity_ld_ident(ptr, new_id_from_chars("", 0));
5139         set_entity_compiler_generated(ptr, 1);
5140         set_entity_visibility(ptr, ir_visibility_private);
5141         add_entity_linkage(ptr, IR_LINKAGE_CONSTANT|IR_LINKAGE_HIDDEN_USER);
5142         set_atomic_ent_value(ptr, val);
5143 }
5144
5145 /**
5146  * Create code for a function and all inner functions.
5147  *
5148  * @param entity  the function entity
5149  */
5150 static void create_function(entity_t *entity)
5151 {
5152         assert(entity->kind == ENTITY_FUNCTION);
5153         ir_entity *function_entity = get_function_entity(entity, current_outer_frame);
5154
5155         if (entity->function.body == NULL)
5156                 return;
5157
5158         inner_functions     = NULL;
5159         current_trampolines = NULL;
5160
5161         if (entity->declaration.modifiers & DM_CONSTRUCTOR) {
5162                 ir_type *segment = get_segment_type(IR_SEGMENT_CONSTRUCTORS);
5163                 add_function_pointer(segment, function_entity, "constructor_ptr.%u");
5164         }
5165         if (entity->declaration.modifiers & DM_DESTRUCTOR) {
5166                 ir_type *segment = get_segment_type(IR_SEGMENT_DESTRUCTORS);
5167                 add_function_pointer(segment, function_entity, "destructor_ptr.%u");
5168         }
5169
5170         current_function_entity = entity;
5171         current_function_name   = NULL;
5172         current_funcsig         = NULL;
5173
5174         assert(!ijmp_ops);
5175         assert(!ijmp_blocks);
5176         init_jump_target(&ijmp_target, NULL);
5177         ijmp_ops    = NEW_ARR_F(ir_node*, 0);
5178         ijmp_blocks = NEW_ARR_F(ir_node*, 0);
5179
5180         int       n_local_vars = get_function_n_local_vars(entity);
5181         ir_graph *irg          = new_ir_graph(function_entity, n_local_vars);
5182         current_ir_graph = irg;
5183
5184         ir_graph *old_current_function = current_function;
5185         current_function = irg;
5186
5187         ir_entity *const old_current_vararg_entity = current_vararg_entity;
5188         current_vararg_entity = NULL;
5189
5190         set_irg_fp_model(irg, firm_fp_model);
5191         tarval_enable_fp_ops(1);
5192         set_irn_dbg_info(get_irg_start_block(irg),
5193                          get_entity_dbg_info(function_entity));
5194
5195         next_value_number_function = 0;
5196         initialize_function_parameters(entity);
5197         current_static_link = entity->function.static_link;
5198
5199         statement_to_firm(entity->function.body);
5200
5201         ir_node *end_block = get_irg_end_block(irg);
5202
5203         /* do we have a return statement yet? */
5204         if (currently_reachable()) {
5205                 type_t *type = skip_typeref(entity->declaration.type);
5206                 assert(is_type_function(type));
5207                 type_t *const return_type = skip_typeref(type->function.return_type);
5208
5209                 ir_node *ret;
5210                 if (is_type_void(return_type)) {
5211                         ret = new_Return(get_store(), 0, NULL);
5212                 } else {
5213                         ir_mode *const mode = get_ir_mode_storage(return_type);
5214
5215                         ir_node *in[1];
5216                         /* §5.1.2.2.3 main implicitly returns 0 */
5217                         if (is_main(entity)) {
5218                                 in[0] = new_Const(get_mode_null(mode));
5219                         } else {
5220                                 in[0] = new_Unknown(mode);
5221                         }
5222                         ret = new_Return(get_store(), 1, in);
5223                 }
5224                 add_immBlock_pred(end_block, ret);
5225         }
5226
5227         if (enter_jump_target(&ijmp_target)) {
5228                 size_t   const n    = ARR_LEN(ijmp_ops);
5229                 ir_node *const op   = n == 1 ? ijmp_ops[0] : new_Phi(n, ijmp_ops, get_irn_mode(ijmp_ops[0]));
5230                 ir_node *const ijmp = new_IJmp(op);
5231                 for (size_t i = ARR_LEN(ijmp_blocks); i-- != 0;) {
5232                         ir_node *const block = ijmp_blocks[i];
5233                         add_immBlock_pred(block, ijmp);
5234                         mature_immBlock(block);
5235                 }
5236         }
5237
5238         DEL_ARR_F(ijmp_ops);
5239         DEL_ARR_F(ijmp_blocks);
5240         ijmp_ops    = NULL;
5241         ijmp_blocks = NULL;
5242
5243         irg_finalize_cons(irg);
5244
5245         /* finalize the frame type */
5246         ir_type *frame_type = get_irg_frame_type(irg);
5247         int      n          = get_compound_n_members(frame_type);
5248         int      align_all  = 4;
5249         int      offset     = 0;
5250         for (int i = 0; i < n; ++i) {
5251                 ir_entity *member      = get_compound_member(frame_type, i);
5252                 ir_type   *entity_type = get_entity_type(member);
5253
5254                 int align = get_type_alignment_bytes(entity_type);
5255                 if (align > align_all)
5256                         align_all = align;
5257                 int misalign = 0;
5258                 if (align > 0) {
5259                         misalign  = offset % align;
5260                         if (misalign > 0) {
5261                                 offset += align - misalign;
5262                         }
5263                 }
5264
5265                 set_entity_offset(member, offset);
5266                 offset += get_type_size_bytes(entity_type);
5267         }
5268         set_type_size_bytes(frame_type, offset);
5269         set_type_alignment_bytes(frame_type, align_all);
5270
5271         irg_verify(irg, VERIFY_ENFORCE_SSA);
5272         current_vararg_entity = old_current_vararg_entity;
5273         current_function      = old_current_function;
5274
5275         if (current_trampolines != NULL) {
5276                 DEL_ARR_F(current_trampolines);
5277                 current_trampolines = NULL;
5278         }
5279
5280         /* create inner functions if any */
5281         entity_t **inner = inner_functions;
5282         if (inner != NULL) {
5283                 ir_type *rem_outer_frame      = current_outer_frame;
5284                 current_outer_frame           = get_irg_frame_type(current_ir_graph);
5285                 for (int i = ARR_LEN(inner) - 1; i >= 0; --i) {
5286                         create_function(inner[i]);
5287                 }
5288                 DEL_ARR_F(inner);
5289
5290                 current_outer_frame      = rem_outer_frame;
5291         }
5292 }
5293
5294 static void scope_to_firm(scope_t *scope)
5295 {
5296         /* first pass: create declarations */
5297         entity_t *entity = scope->entities;
5298         for ( ; entity != NULL; entity = entity->base.next) {
5299                 if (entity->base.symbol == NULL)
5300                         continue;
5301
5302                 if (entity->kind == ENTITY_FUNCTION) {
5303                         if (entity->function.btk != BUILTIN_NONE) {
5304                                 /* builtins have no representation */
5305                                 continue;
5306                         }
5307                         (void)get_function_entity(entity, NULL);
5308                 } else if (entity->kind == ENTITY_VARIABLE) {
5309                         create_global_variable(entity);
5310                 } else if (entity->kind == ENTITY_NAMESPACE) {
5311                         scope_to_firm(&entity->namespacee.members);
5312                 }
5313         }
5314
5315         /* second pass: create code/initializers */
5316         entity = scope->entities;
5317         for ( ; entity != NULL; entity = entity->base.next) {
5318                 if (entity->base.symbol == NULL)
5319                         continue;
5320
5321                 if (entity->kind == ENTITY_FUNCTION) {
5322                         if (entity->function.btk != BUILTIN_NONE) {
5323                                 /* builtins have no representation */
5324                                 continue;
5325                         }
5326                         create_function(entity);
5327                 } else if (entity->kind == ENTITY_VARIABLE) {
5328                         assert(entity->declaration.kind
5329                                         == DECLARATION_KIND_GLOBAL_VARIABLE);
5330                         current_ir_graph = get_const_code_irg();
5331                         create_variable_initializer(entity);
5332                 }
5333         }
5334 }
5335
5336 void init_ast2firm(void)
5337 {
5338         obstack_init(&asm_obst);
5339         init_atomic_modes();
5340
5341         ir_set_debug_retrieve(dbg_retrieve);
5342         ir_set_type_debug_retrieve(dbg_print_type_dbg_info);
5343
5344         /* create idents for all known runtime functions */
5345         for (size_t i = 0; i < lengthof(rts_data); ++i) {
5346                 rts_idents[i] = new_id_from_str(rts_data[i].name);
5347         }
5348
5349         entitymap_init(&entitymap);
5350 }
5351
5352 static void init_ir_types(void)
5353 {
5354         static int ir_types_initialized = 0;
5355         if (ir_types_initialized)
5356                 return;
5357         ir_types_initialized = 1;
5358
5359         ir_type_char = get_ir_type(type_char);
5360
5361         be_params             = be_get_backend_param();
5362         mode_float_arithmetic = be_params->mode_float_arithmetic;
5363
5364         stack_param_align     = be_params->stack_param_align;
5365 }
5366
5367 void exit_ast2firm(void)
5368 {
5369         entitymap_destroy(&entitymap);
5370         obstack_free(&asm_obst, NULL);
5371 }
5372
5373 static void global_asm_to_firm(statement_t *s)
5374 {
5375         for (; s != NULL; s = s->base.next) {
5376                 assert(s->kind == STATEMENT_ASM);
5377
5378                 char const *const text = s->asms.asm_text.begin;
5379                 size_t      const size = s->asms.asm_text.size;
5380                 ident      *const id   = new_id_from_chars(text, size);
5381                 add_irp_asm(id);
5382         }
5383 }
5384
5385 static const char *get_cwd(void)
5386 {
5387         static char buf[1024];
5388         if (buf[0] == '\0') {
5389                 return getcwd(buf, sizeof(buf));
5390         }
5391         return buf;
5392 }
5393
5394 void translation_unit_to_firm(translation_unit_t *unit)
5395 {
5396         if (c_mode & _CXX) {
5397                 be_dwarf_set_source_language(DW_LANG_C_plus_plus);
5398         } else if (c_mode & _C99) {
5399                 be_dwarf_set_source_language(DW_LANG_C99);
5400         } else if (c_mode & _C89) {
5401                 be_dwarf_set_source_language(DW_LANG_C89);
5402         } else {
5403                 be_dwarf_set_source_language(DW_LANG_C);
5404         }
5405         const char *cwd = get_cwd();
5406         if (cwd != NULL) {
5407                 be_dwarf_set_compilation_directory(cwd);
5408         }
5409
5410         /* initialize firm arithmetic */
5411         tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
5412         ir_set_uninitialized_local_variable_func(uninitialized_local_var);
5413
5414         /* just to be sure */
5415         init_jump_target(&break_target,    NULL);
5416         init_jump_target(&continue_target, NULL);
5417         current_switch           = NULL;
5418         current_translation_unit = unit;
5419
5420         init_ir_types();
5421
5422         scope_to_firm(&unit->scope);
5423         global_asm_to_firm(unit->global_asm);
5424
5425         current_ir_graph         = NULL;
5426         current_translation_unit = NULL;
5427 }