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                 position_t const *const pos = &entity->base.pos;
 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         position_t const *const pos = (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 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                 switch (size) {
 214                 case 4:  return get_modeF();
 215                 case 8:  return get_modeD();
 216                 default: panic("unexpected kind");
 217                 }
 218         } else if (flags & ATOMIC_TYPE_FLAG_INTEGER) {
 219                 char            name[64];
 220                 unsigned        bit_size     = size * 8;
 221                 bool            is_signed    = (flags & ATOMIC_TYPE_FLAG_SIGNED) != 0;
 222                 unsigned        modulo_shift = decide_modulo_shift(bit_size);
 223
 224                 snprintf(name, sizeof(name), "%s%u", is_signed ? "I" : "U", bit_size);
 225                 return new_int_mode(name, irma_twos_complement, bit_size, is_signed,
 226                                     modulo_shift);
 227         }
 228
 229         return NULL;
 230 }
 231
 232 /**
 233  * Initialises the atomic modes depending on the machine size.
 234  */
 235 static void init_atomic_modes(void)
 236 {
 237         atomic_modes[ATOMIC_TYPE_VOID] = mode_ANY;
 238         for (int i = 0; i <= ATOMIC_TYPE_LAST; ++i) {
 239                 if (atomic_modes[i] != NULL)
 240                         continue;
 241                 atomic_modes[i] = init_atomic_ir_mode((atomic_type_kind_t) i);
 242         }
 243 }
 244
 245 ir_mode *get_atomic_mode(atomic_type_kind_t kind)
 246 {
 247         assert(kind <= ATOMIC_TYPE_LAST);
 248         return atomic_modes[kind];
 249 }
 250
 251 static ir_node *get_vla_size(array_type_t *const type)
 252 {
 253         ir_node *size_node = type->size_node;
 254         if (size_node == NULL) {
 255                 size_node = expression_to_firm(type->size_expression);
 256                 type->size_node = size_node;
 257         }
 258         return size_node;
 259 }
 260
 261 static unsigned count_parameters(const function_type_t *function_type)
 262 {
 263         unsigned count = 0;
 264
 265         function_parameter_t *parameter = function_type->parameters;
 266         for ( ; parameter != NULL; parameter = parameter->next) {
 267                 ++count;
 268         }
 269
 270         return count;
 271 }
 272
 273 static ir_type *create_primitive_irtype(atomic_type_kind_t akind,
 274                                         type_dbg_info *dbgi)
 275 {
 276         ir_mode        *mode      = atomic_modes[akind];
 277         ir_type        *irtype    = new_d_type_primitive(mode, dbgi);
 278         unsigned        alignment = get_atomic_type_alignment(akind);
 279         unsigned        size      = get_atomic_type_size(akind);
 280
 281         set_type_size_bytes(irtype, size);
 282         set_type_alignment_bytes(irtype, alignment);
 283
 284         return irtype;
 285 }
 286
 287 /**
 288  * Creates a Firm type for an atomic type
 289  */
 290 static ir_type *create_atomic_type(atomic_type_kind_t akind, const type_t *type)
 291 {
 292         type_dbg_info *dbgi = get_type_dbg_info_(type);
 293         return create_primitive_irtype(akind, dbgi);
 294 }
 295
 296 /**
 297  * Creates a Firm type for a complex type
 298  */
 299 static ir_type *create_complex_type(atomic_type_kind_t akind,
 300                                     const type_t *type)
 301 {
 302         type_dbg_info *dbgi   = get_type_dbg_info_(type);
 303         ir_type       *etype  = create_primitive_irtype(akind, NULL);
 304         ir_type       *irtype = new_d_type_array(1, etype, dbgi);
 305
 306         int align = get_type_alignment_bytes(etype);
 307         set_type_alignment_bytes(irtype, align);
 308         unsigned n_elements = 2;
 309         set_array_bounds_int(irtype, 0, 0, n_elements);
 310         size_t elemsize = get_type_size_bytes(etype);
 311         if (elemsize % align > 0) {
 312                 elemsize += align - (elemsize % align);
 313         }
 314         set_type_size_bytes(irtype, n_elements * elemsize);
 315
 316         return irtype;
 317 }
 318
 319 /**
 320  * Creates a Firm type for an imaginary type
 321  */
 322 static ir_type *create_imaginary_type(const atomic_type_t *type)
 323 {
 324         return create_atomic_type(type->akind, (const type_t*)type);
 325 }
 326
 327 /**
 328  * return type of a parameter (and take transparent union gnu extension into
 329  * account)
 330  */
 331 static type_t *get_parameter_type(type_t *orig_type)
 332 {
 333         type_t *type = skip_typeref(orig_type);
 334         if (is_type_union(type)
 335                         && get_type_modifiers(orig_type) & DM_TRANSPARENT_UNION) {
 336                 compound_t *compound = type->compound.compound;
 337                 type                 = compound->members.entities->declaration.type;
 338         }
 339
 340         return type;
 341 }
 342
 343 static ir_type *create_method_type(const function_type_t *function_type, bool for_closure)
 344 {
 345         type_t        *return_type  = skip_typeref(function_type->return_type);
 346
 347         int            n_parameters = count_parameters(function_type)
 348                                        + (for_closure ? 1 : 0);
 349         int            n_results    = is_type_void(return_type) ? 0 : 1;
 350         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) function_type);
 351         ir_type       *irtype       = new_d_type_method(n_parameters, n_results, dbgi);
 352
 353         if (!is_type_void(return_type)) {
 354                 ir_type *restype = get_ir_type(return_type);
 355                 set_method_res_type(irtype, 0, restype);
 356         }
 357
 358         function_parameter_t *parameter = function_type->parameters;
 359         int                   n         = 0;
 360         if (for_closure) {
 361                 ir_type *p_irtype = get_ir_type(type_void_ptr);
 362                 set_method_param_type(irtype, n, p_irtype);
 363                 ++n;
 364         }
 365         for ( ; parameter != NULL; parameter = parameter->next) {
 366                 type_t  *type     = get_parameter_type(parameter->type);
 367                 ir_type *p_irtype = get_ir_type(type);
 368                 set_method_param_type(irtype, n, p_irtype);
 369                 ++n;
 370         }
 371
 372         bool is_variadic = function_type->variadic;
 373
 374         if (is_variadic)
 375                 set_method_variadicity(irtype, variadicity_variadic);
 376
 377         unsigned cc = get_method_calling_convention(irtype);
 378         switch (function_type->calling_convention) {
 379         case CC_DEFAULT: /* unspecified calling convention, equal to one of the other, typically cdecl */
 380         case CC_CDECL:
 381 is_cdecl:
 382                 set_method_calling_convention(irtype, SET_CDECL(cc));
 383                 break;
 384
 385         case CC_STDCALL:
 386                 if (is_variadic)
 387                         goto is_cdecl;
 388
 389                 /* only non-variadic function can use stdcall, else use cdecl */
 390                 set_method_calling_convention(irtype, SET_STDCALL(cc));
 391                 break;
 392
 393         case CC_FASTCALL:
 394                 if (is_variadic)
 395                         goto is_cdecl;
 396                 /* only non-variadic function can use fastcall, else use cdecl */
 397                 set_method_calling_convention(irtype, SET_FASTCALL(cc));
 398                 break;
 399
 400         case CC_THISCALL:
 401                 /* Hmm, leave default, not accepted by the parser yet. */
 402                 break;
 403         }
 404
 405         if (for_closure)
 406                 set_method_calling_convention(irtype, get_method_calling_convention(irtype) | cc_this_call);
 407
 408         const decl_modifiers_t modifiers = function_type->modifiers;
 409         if (modifiers & DM_CONST)
 410                 add_method_additional_properties(irtype, mtp_property_const);
 411         if (modifiers & DM_PURE)
 412                 add_method_additional_properties(irtype, mtp_property_pure);
 413         if (modifiers & DM_RETURNS_TWICE)
 414                 add_method_additional_properties(irtype, mtp_property_returns_twice);
 415         if (modifiers & DM_NORETURN)
 416                 add_method_additional_properties(irtype, mtp_property_noreturn);
 417         if (modifiers & DM_NOTHROW)
 418                 add_method_additional_properties(irtype, mtp_property_nothrow);
 419         if (modifiers & DM_MALLOC)
 420                 add_method_additional_properties(irtype, mtp_property_malloc);
 421
 422         return irtype;
 423 }
 424
 425 static ir_type *create_pointer_type(pointer_type_t *type)
 426 {
 427         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) type);
 428         type_t        *points_to    = type->points_to;
 429         ir_type       *ir_points_to = get_ir_type_incomplete(points_to);
 430         ir_type       *irtype       = new_d_type_pointer(ir_points_to, dbgi);
 431
 432         return irtype;
 433 }
 434
 435 static ir_type *create_reference_type(reference_type_t *type)
 436 {
 437         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) type);
 438         type_t        *refers_to    = type->refers_to;
 439         ir_type       *ir_refers_to = get_ir_type_incomplete(refers_to);
 440         ir_type       *irtype       = new_d_type_pointer(ir_refers_to, dbgi);
 441
 442         return irtype;
 443 }
 444
 445 static ir_type *create_array_type(array_type_t *type)
 446 {
 447         type_dbg_info *dbgi            = get_type_dbg_info_((const type_t*) type);
 448         type_t        *element_type    = type->element_type;
 449         ir_type       *ir_element_type = get_ir_type(element_type);
 450         ir_type       *irtype          = new_d_type_array(1, ir_element_type, dbgi);
 451
 452         const int align = get_type_alignment_bytes(ir_element_type);
 453         set_type_alignment_bytes(irtype, align);
 454
 455         if (type->size_constant) {
 456                 int n_elements = type->size;
 457
 458                 set_array_bounds_int(irtype, 0, 0, n_elements);
 459
 460                 size_t elemsize = get_type_size_bytes(ir_element_type);
 461                 if (elemsize % align > 0) {
 462                         elemsize += align - (elemsize % align);
 463                 }
 464                 set_type_size_bytes(irtype, n_elements * elemsize);
 465         } else {
 466                 set_array_lower_bound_int(irtype, 0, 0);
 467         }
 468         set_type_state(irtype, layout_fixed);
 469
 470         return irtype;
 471 }
 472
 473 /**
 474  * Return the signed integer type of size bits.
 475  *
 476  * @param size   the size
 477  */
 478 static ir_type *get_signed_int_type_for_bit_size(ir_type *base_tp,
 479                                                  unsigned size,
 480                                                                                                  const type_t *type)
 481 {
 482         static ir_mode *s_modes[64 + 1] = {NULL, };
 483         ir_type *res;
 484         ir_mode *mode;
 485
 486         if (size <= 0 || size > 64)
 487                 return NULL;
 488
 489         mode = s_modes[size];
 490         if (mode == NULL) {
 491                 char name[32];
 492
 493                 snprintf(name, sizeof(name), "bf_I%u", size);
 494                 mode = new_int_mode(name, irma_twos_complement, size, 1, 0);
 495                 s_modes[size] = mode;
 496         }
 497
 498         type_dbg_info *dbgi = get_type_dbg_info_(type);
 499         res                 = new_d_type_primitive(mode, dbgi);
 500         set_primitive_base_type(res, base_tp);
 501
 502         return res;
 503 }
 504
 505 /**
 506  * Return the unsigned integer type of size bits.
 507  *
 508  * @param size   the size
 509  */
 510 static ir_type *get_unsigned_int_type_for_bit_size(ir_type *base_tp,
 511                                                    unsigned size,
 512                                                                                                    const type_t *type)
 513 {
 514         static ir_mode *u_modes[64 + 1] = {NULL, };
 515         ir_type *res;
 516         ir_mode *mode;
 517
 518         if (size <= 0 || size > 64)
 519                 return NULL;
 520
 521         mode = u_modes[size];
 522         if (mode == NULL) {
 523                 char name[32];
 524
 525                 snprintf(name, sizeof(name), "bf_U%u", size);
 526                 mode = new_int_mode(name, irma_twos_complement, size, 0, 0);
 527                 u_modes[size] = mode;
 528         }
 529
 530         type_dbg_info *dbgi = get_type_dbg_info_(type);
 531         res = new_d_type_primitive(mode, dbgi);
 532         set_primitive_base_type(res, base_tp);
 533
 534         return res;
 535 }
 536
 537 static ir_type *create_bitfield_type(const entity_t *entity)
 538 {
 539         assert(entity->kind == ENTITY_COMPOUND_MEMBER);
 540         type_t *base = skip_typeref(entity->declaration.type);
 541         assert(is_type_integer(base));
 542         ir_type *irbase = get_ir_type(base);
 543
 544         unsigned bit_size = entity->compound_member.bit_size;
 545
 546         if (is_type_signed(base)) {
 547                 return get_signed_int_type_for_bit_size(irbase, bit_size, base);
 548         } else {
 549                 return get_unsigned_int_type_for_bit_size(irbase, bit_size, base);
 550         }
 551 }
 552
 553 /**
 554  * Construct firm type from ast struct type.
 555  */
 556 static ir_type *create_compound_type(compound_type_t *const type, bool const incomplete)
 557 {
 558         compound_t *compound = type->compound;
 559
 560         if (compound->irtype != NULL && (compound->irtype_complete || incomplete)) {
 561                 return compound->irtype;
 562         }
 563
 564         bool const is_union = type->base.kind == TYPE_COMPOUND_UNION;
 565
 566         symbol_t *type_symbol = compound->base.symbol;
 567         ident    *id;
 568         if (type_symbol != NULL) {
 569                 id = new_id_from_str(type_symbol->string);
 570         } else {
 571                 if (is_union) {
 572                         id = id_unique("__anonymous_union.%u");
 573                 } else {
 574                         id = id_unique("__anonymous_struct.%u");
 575                 }
 576         }
 577
 578         ir_type *irtype;
 579         if (is_union) {
 580                 irtype = new_type_union(id);
 581         } else {
 582                 irtype = new_type_struct(id);
 583         }
 584
 585         compound->irtype_complete = false;
 586         compound->irtype          = irtype;
 587
 588         if (incomplete)
 589                 return irtype;
 590
 591         if (is_union) {
 592                 layout_union_type(type);
 593         } else {
 594                 layout_struct_type(type);
 595         }
 596
 597         compound->irtype_complete = true;
 598
 599         entity_t *entry = compound->members.entities;
 600         for ( ; entry != NULL; entry = entry->base.next) {
 601                 if (entry->kind != ENTITY_COMPOUND_MEMBER)
 602                         continue;
 603
 604                 symbol_t *symbol     = entry->base.symbol;
 605                 type_t   *entry_type = entry->declaration.type;
 606                 ident    *ident;
 607                 if (symbol == NULL) {
 608                         /* anonymous bitfield member, skip */
 609                         if (entry->compound_member.bitfield)
 610                                 continue;
 611                         assert(is_type_compound(entry_type));
 612                         ident = id_unique("anon.%u");
 613                 } else {
 614                         ident = new_id_from_str(symbol->string);
 615                 }
 616
 617                 dbg_info *dbgi = get_dbg_info(&entry->base.pos);
 618
 619                 ir_type *entry_irtype;
 620                 if (entry->compound_member.bitfield) {
 621                         entry_irtype = create_bitfield_type(entry);
 622                 } else {
 623                         entry_irtype = get_ir_type(entry_type);
 624                 }
 625                 ir_entity *entity = new_d_entity(irtype, ident, entry_irtype, dbgi);
 626
 627                 set_entity_offset(entity, entry->compound_member.offset);
 628                 set_entity_offset_bits_remainder(entity,
 629                                                  entry->compound_member.bit_offset);
 630
 631                 assert(entry->declaration.kind == DECLARATION_KIND_UNKNOWN);
 632                 entry->declaration.kind       = DECLARATION_KIND_COMPOUND_MEMBER;
 633                 entry->compound_member.entity = entity;
 634         }
 635
 636         set_type_alignment_bytes(irtype, compound->alignment);
 637         set_type_size_bytes(irtype, compound->size);
 638         set_type_state(irtype, layout_fixed);
 639
 640         return irtype;
 641 }
 642
 643 void determine_enum_values(enum_type_t *const type)
 644 {
 645         ir_mode   *const mode    = atomic_modes[type->base.akind];
 646         ir_tarval *const one     = get_mode_one(mode);
 647         ir_tarval *      tv_next = get_mode_null(mode);
 648
 649         enum_t   *enume = type->enume;
 650         entity_t *entry = enume->base.next;
 651         for (; entry != NULL; entry = entry->base.next) {
 652                 if (entry->kind != ENTITY_ENUM_VALUE)
 653                         break;
 654
 655                 expression_t *const init = entry->enum_value.value;
 656                 if (init != NULL) {
 657                         tv_next = fold_constant_to_tarval(init);
 658                 }
 659                 assert(entry->enum_value.tv == NULL || entry->enum_value.tv == tv_next);
 660                 entry->enum_value.tv = tv_next;
 661                 tv_next = tarval_add(tv_next, one);
 662         }
 663 }
 664
 665 static ir_type *create_enum_type(enum_type_t *const type)
 666 {
 667         return create_atomic_type(type->base.akind, (const type_t*) type);
 668 }
 669
 670 static ir_type *get_ir_type_incomplete(type_t *type)
 671 {
 672         type = skip_typeref(type);
 673
 674         if (type->base.firm_type != NULL) {
 675                 return type->base.firm_type;
 676         }
 677
 678         if (is_type_compound(type)) {
 679                 return create_compound_type(&type->compound, true);
 680         } else {
 681                 return get_ir_type(type);
 682         }
 683 }
 684
 685 ir_type *get_ir_type(type_t *type)
 686 {
 687         type = skip_typeref(type);
 688
 689         if (type->base.firm_type != NULL) {
 690                 return type->base.firm_type;
 691         }
 692
 693         ir_type *firm_type = NULL;
 694         switch (type->kind) {
 695         case TYPE_ATOMIC:
 696                 firm_type = create_atomic_type(type->atomic.akind, type);
 697                 break;
 698         case TYPE_COMPLEX:
 699                 firm_type = create_complex_type(type->atomic.akind, type);
 700                 break;
 701         case TYPE_IMAGINARY:
 702                 firm_type = create_imaginary_type(&type->atomic);
 703                 break;
 704         case TYPE_FUNCTION:
 705                 firm_type = create_method_type(&type->function, false);
 706                 break;
 707         case TYPE_POINTER:
 708                 firm_type = create_pointer_type(&type->pointer);
 709                 break;
 710         case TYPE_REFERENCE:
 711                 firm_type = create_reference_type(&type->reference);
 712                 break;
 713         case TYPE_ARRAY:
 714                 firm_type = create_array_type(&type->array);
 715                 break;
 716         case TYPE_COMPOUND_STRUCT:
 717         case TYPE_COMPOUND_UNION:
 718                 firm_type = create_compound_type(&type->compound, false);
 719                 break;
 720         case TYPE_ENUM:
 721                 firm_type = create_enum_type(&type->enumt);
 722                 break;
 723
 724         case TYPE_ERROR:
 725         case TYPE_TYPEOF:
 726         case TYPE_TYPEDEF:
 727                 break;
 728         }
 729         if (firm_type == NULL)
 730                 panic("unknown type found");
 731
 732         type->base.firm_type = firm_type;
 733         return firm_type;
 734 }
 735
 736 static ir_mode *get_ir_mode_storage(type_t *type)
 737 {
 738         type = skip_typeref(type);
 739
 740         /* Firm doesn't report a mode for arrays and structs/unions. */
 741         if (!is_type_scalar(type)) {
 742                 return mode_P_data;
 743         }
 744
 745         ir_type *const irtype = get_ir_type(type);
 746         ir_mode *const mode   = get_type_mode(irtype);
 747         assert(mode != NULL);
 748         return mode;
 749 }
 750
 751 /*
 752  * get arithmetic mode for a type. This is different from get_ir_mode_storage,
 753  * int that it returns bigger modes for floating point on some platforms
 754  * (x87 internally does arithemtic with 80bits)
 755  */
 756 static ir_mode *get_ir_mode_arithmetic(type_t *type)
 757 {
 758         ir_mode *mode = get_ir_mode_storage(type);
 759         if (mode_is_float(mode) && mode_float_arithmetic != NULL) {
 760                 return mode_float_arithmetic;
 761         }
 762
 763         return mode;
 764 }
 765
 766 /**
 767  * Return a node representing the size of a type.
 768  */
 769 static ir_node *get_type_size_node(type_t *type)
 770 {
 771         unsigned size;
 772         ir_mode *mode = get_ir_mode_arithmetic(type_size_t);
 773         type = skip_typeref(type);
 774
 775         if (is_type_array(type) && type->array.is_vla) {
 776                 ir_node *size_node = get_vla_size(&type->array);
 777                 ir_node *elem_size = get_type_size_node(type->array.element_type);
 778                 ir_node *real_size = new_d_Mul(NULL, size_node, elem_size, mode);
 779                 return real_size;
 780         }
 781
 782         size = get_type_size(type);
 783         return new_Const_long(mode, size);
 784 }
 785
 786 /** Names of the runtime functions. */
 787 static const struct {
 788         int        id;           /**< the rts id */
 789         int        n_res;        /**< number of return values */
 790         const char *name;        /**< the name of the rts function */
 791         int        n_params;     /**< number of parameters */
 792         unsigned   flags;        /**< language flags */
 793 } rts_data[] = {
 794         { rts_debugbreak, 0, "__debugbreak", 0, _MS },
 795         { rts_abort,      0, "abort",        0, _C89 },
 796         { rts_alloca,     1, "alloca",       1, _ALL },
 797         { rts_abs,        1, "abs",          1, _C89 },
 798         { rts_labs,       1, "labs",         1, _C89 },
 799         { rts_llabs,      1, "llabs",        1, _C99 },
 800         { rts_imaxabs,    1, "imaxabs",      1, _C99 },
 801
 802         { rts_fabs,       1, "fabs",         1, _C89 },
 803         { rts_sqrt,       1, "sqrt",         1, _C89 },
 804         { rts_cbrt,       1, "cbrt",         1, _C99 },
 805         { rts_exp,        1, "exp",          1, _C89 },
 806         { rts_exp2,       1, "exp2",         1, _C89 },
 807         { rts_exp10,      1, "exp10",        1, _GNUC },
 808         { rts_log,        1, "log",          1, _C89 },
 809         { rts_log2,       1, "log2",         1, _C89 },
 810         { rts_log10,      1, "log10",        1, _C89 },
 811         { rts_pow,        1, "pow",          2, _C89 },
 812         { rts_sin,        1, "sin",          1, _C89 },
 813         { rts_cos,        1, "cos",          1, _C89 },
 814         { rts_tan,        1, "tan",          1, _C89 },
 815         { rts_asin,       1, "asin",         1, _C89 },
 816         { rts_acos,       1, "acos",         1, _C89 },
 817         { rts_atan,       1, "atan",         1, _C89 },
 818         { rts_sinh,       1, "sinh",         1, _C89 },
 819         { rts_cosh,       1, "cosh",         1, _C89 },
 820         { rts_tanh,       1, "tanh",         1, _C89 },
 821
 822         { rts_fabsf,      1, "fabsf",        1, _C99 },
 823         { rts_sqrtf,      1, "sqrtf",        1, _C99 },
 824         { rts_cbrtf,      1, "cbrtf",        1, _C99 },
 825         { rts_expf,       1, "expf",         1, _C99 },
 826         { rts_exp2f,      1, "exp2f",        1, _C99 },
 827         { rts_exp10f,     1, "exp10f",       1, _GNUC },
 828         { rts_logf,       1, "logf",         1, _C99 },
 829         { rts_log2f,      1, "log2f",        1, _C99 },
 830         { rts_log10f,     1, "log10f",       1, _C99 },
 831         { rts_powf,       1, "powf",         2, _C99 },
 832         { rts_sinf,       1, "sinf",         1, _C99 },
 833         { rts_cosf,       1, "cosf",         1, _C99 },
 834         { rts_tanf,       1, "tanf",         1, _C99 },
 835         { rts_asinf,      1, "asinf",        1, _C99 },
 836         { rts_acosf,      1, "acosf",        1, _C99 },
 837         { rts_atanf,      1, "atanf",        1, _C99 },
 838         { rts_sinhf,      1, "sinhf",        1, _C99 },
 839         { rts_coshf,      1, "coshf",        1, _C99 },
 840         { rts_tanhf,      1, "tanhf",        1, _C99 },
 841
 842         { rts_fabsl,      1, "fabsl",        1, _C99 },
 843         { rts_sqrtl,      1, "sqrtl",        1, _C99 },
 844         { rts_cbrtl,      1, "cbrtl",        1, _C99 },
 845         { rts_expl,       1, "expl",         1, _C99 },
 846         { rts_exp2l,      1, "exp2l",        1, _C99 },
 847         { rts_exp10l,     1, "exp10l",       1, _GNUC },
 848         { rts_logl,       1, "logl",         1, _C99 },
 849         { rts_log2l,      1, "log2l",        1, _C99 },
 850         { rts_log10l,     1, "log10l",       1, _C99 },
 851         { rts_powl,       1, "powl",         2, _C99 },
 852         { rts_sinl,       1, "sinl",         1, _C99 },
 853         { rts_cosl,       1, "cosl",         1, _C99 },
 854         { rts_tanl,       1, "tanl",         1, _C99 },
 855         { rts_asinl,      1, "asinl",        1, _C99 },
 856         { rts_acosl,      1, "acosl",        1, _C99 },
 857         { rts_atanl,      1, "atanl",        1, _C99 },
 858         { rts_sinhl,      1, "sinhl",        1, _C99 },
 859         { rts_coshl,      1, "coshl",        1, _C99 },
 860         { rts_tanhl,      1, "tanhl",        1, _C99 },
 861
 862         { rts_strcmp,     1, "strcmp",       2, _C89 },
 863         { rts_strncmp,    1, "strncmp",      3, _C89 },
 864         { rts_strcpy,     1, "strcpy",       2, _C89 },
 865         { rts_strlen,     1, "strlen",       1, _C89 },
 866         { rts_memcpy,     1, "memcpy",       3, _C89 },
 867         { rts_mempcpy,    1, "mempcpy",      3, _GNUC },
 868         { rts_memmove,    1, "memmove",      3, _C89 },
 869         { rts_memset,     1, "memset",       3, _C89 },
 870         { rts_memcmp,     1, "memcmp",       3, _C89 },
 871 };
 872
 873 static ident *rts_idents[lengthof(rts_data)];
 874
 875 static create_ld_ident_func create_ld_ident = create_name_linux_elf;
 876
 877 void set_create_ld_ident(ident *(*func)(entity_t*))
 878 {
 879         create_ld_ident = func;
 880 }
 881
 882 static bool declaration_is_definition(const entity_t *entity)
 883 {
 884         switch (entity->kind) {
 885         case ENTITY_VARIABLE:
 886                 return entity->declaration.storage_class != STORAGE_CLASS_EXTERN;
 887         case ENTITY_FUNCTION:
 888                 return entity->function.body != NULL;
 889         case ENTITY_PARAMETER:
 890         case ENTITY_COMPOUND_MEMBER:
 891                 return false;
 892         case ENTITY_TYPEDEF:
 893         case ENTITY_ENUM:
 894         case ENTITY_ENUM_VALUE:
 895         case ENTITY_NAMESPACE:
 896         case ENTITY_LABEL:
 897         case ENTITY_LOCAL_LABEL:
 898                 break;
 899         }
 900         panic("entity is not a declaration");
 901 }
 902
 903 /**
 904  * Handle GNU attributes for entities
 905  *
 906  * @param ent   the entity
 907  * @param decl  the routine declaration
 908  */
 909 static void handle_decl_modifiers(ir_entity *irentity, entity_t *entity)
 910 {
 911         assert(is_declaration(entity));
 912         decl_modifiers_t modifiers = entity->declaration.modifiers;
 913
 914         if (is_method_entity(irentity)) {
 915                 if (modifiers & DM_PURE)
 916                         add_entity_additional_properties(irentity, mtp_property_pure);
 917                 if (modifiers & DM_CONST)
 918                         add_entity_additional_properties(irentity, mtp_property_const);
 919                 if (modifiers & DM_NOINLINE)
 920                         add_entity_additional_properties(irentity, mtp_property_noinline);
 921                 if (modifiers & DM_FORCEINLINE)
 922                         add_entity_additional_properties(irentity, mtp_property_always_inline);
 923                 if (modifiers & DM_NAKED)
 924                         add_entity_additional_properties(irentity, mtp_property_naked);
 925                 if (entity->kind == ENTITY_FUNCTION && entity->function.is_inline)
 926                         add_entity_additional_properties(irentity,
 927                                                                                          mtp_property_inline_recommended);
 928         }
 929         if ((modifiers & DM_USED) && declaration_is_definition(entity)) {
 930                 add_entity_linkage(irentity, IR_LINKAGE_HIDDEN_USER);
 931         }
 932         if ((modifiers & DM_WEAK) && declaration_is_definition(entity)
 933             && entity->declaration.storage_class != STORAGE_CLASS_EXTERN) {
 934                 add_entity_linkage(irentity, IR_LINKAGE_WEAK);
 935         }
 936 }
 937
 938 static bool is_main(entity_t *entity)
 939 {
 940         static symbol_t *sym_main = NULL;
 941         if (sym_main == NULL) {
 942                 sym_main = symbol_table_insert("main");
 943         }
 944
 945         if (entity->base.symbol != sym_main)
 946                 return false;
 947         /* must be in outermost scope */
 948         if (entity->base.parent_scope != &current_translation_unit->scope)
 949                 return false;
 950
 951         return true;
 952 }
 953
 954 /**
 955  * Creates an entity representing a function.
 956  *
 957  * @param entity       the function declaration/definition
 958  * @param owner_type   the owner type of this function, NULL
 959  *                     for global functions
 960  */
 961 static ir_entity *get_function_entity(entity_t *entity, ir_type *owner_type)
 962 {
 963         assert(entity->kind == ENTITY_FUNCTION);
 964         if (entity->function.irentity != NULL)
 965                 return entity->function.irentity;
 966
 967         switch (entity->function.btk) {
 968         case BUILTIN_NONE:
 969         case BUILTIN_LIBC:
 970         case BUILTIN_LIBC_CHECK:
 971                 break;
 972         default:
 973                 return NULL;
 974         }
 975
 976         symbol_t *symbol = entity->base.symbol;
 977         ident    *id     = new_id_from_str(symbol->string);
 978
 979         /* already an entity defined? */
 980         ir_entity *irentity = entitymap_get(&entitymap, symbol);
 981         bool const has_body = entity->function.body != NULL;
 982         if (irentity != NULL) {
 983                 goto entity_created;
 984         }
 985
 986         ir_type *ir_type_method;
 987         if (entity->function.need_closure)
 988                 ir_type_method = create_method_type(&entity->declaration.type->function, true);
 989         else
 990                 ir_type_method = get_ir_type(entity->declaration.type);
 991
 992         bool nested_function = false;
 993         if (owner_type == NULL)
 994                 owner_type = get_glob_type();
 995         else
 996                 nested_function = true;
 997
 998         dbg_info *const dbgi = get_dbg_info(&entity->base.pos);
 999         irentity = new_d_entity(owner_type, id, ir_type_method, dbgi);
1000
1001         ident *ld_id;
1002         if (nested_function)
1003                 ld_id = id_unique("inner.%u");
1004         else
1005                 ld_id = create_ld_ident(entity);
1006         set_entity_ld_ident(irentity, ld_id);
1007
1008         handle_decl_modifiers(irentity, entity);
1009
1010         if (! nested_function) {
1011                 storage_class_tag_t const storage_class
1012                         = (storage_class_tag_t) entity->declaration.storage_class;
1013                 if (storage_class == STORAGE_CLASS_STATIC) {
1014                     set_entity_visibility(irentity, ir_visibility_local);
1015                 } else {
1016                     set_entity_visibility(irentity, ir_visibility_external);
1017                 }
1018
1019                 bool const is_inline = entity->function.is_inline;
1020                 if (is_inline && has_body) {
1021                         if (((c_mode & _C99) && storage_class == STORAGE_CLASS_NONE)
1022                             || ((c_mode & _C99) == 0
1023                                 && storage_class == STORAGE_CLASS_EXTERN)) {
1024                                 add_entity_linkage(irentity, IR_LINKAGE_NO_CODEGEN);
1025                         }
1026                 }
1027         } else {
1028                 /* nested functions are always local */
1029                 set_entity_visibility(irentity, ir_visibility_local);
1030         }
1031
1032         /* We should check for file scope here, but as long as we compile C only
1033            this is not needed. */
1034         if (!freestanding && !has_body) {
1035                 /* check for a known runtime function */
1036                 for (size_t i = 0; i < lengthof(rts_data); ++i) {
1037                         if (id != rts_idents[i])
1038                                 continue;
1039
1040                         function_type_t *function_type
1041                                 = &entity->declaration.type->function;
1042                         /* rts_entities code can't handle a "wrong" number of parameters */
1043                         if (function_type->unspecified_parameters)
1044                                 continue;
1045
1046                         /* check number of parameters */
1047                         int n_params = count_parameters(function_type);
1048                         if (n_params != rts_data[i].n_params)
1049                                 continue;
1050
1051                         type_t *return_type = skip_typeref(function_type->return_type);
1052                         int     n_res       = is_type_void(return_type) ? 0 : 1;
1053                         if (n_res != rts_data[i].n_res)
1054                                 continue;
1055
1056                         /* ignore those rts functions not necessary needed for current mode */
1057                         if ((c_mode & rts_data[i].flags) == 0)
1058                                 continue;
1059                         assert(rts_entities[rts_data[i].id] == NULL);
1060                         rts_entities[rts_data[i].id] = irentity;
1061                 }
1062         }
1063
1064         entitymap_insert(&entitymap, symbol, irentity);
1065
1066 entity_created:
1067         entity->declaration.kind  = DECLARATION_KIND_FUNCTION;
1068         entity->function.irentity = irentity;
1069
1070         return irentity;
1071 }
1072
1073 /**
1074  * Creates a SymConst for a given entity.
1075  *
1076  * @param dbgi    debug info
1077  * @param entity  the entity
1078  */
1079 static ir_node *create_symconst(dbg_info *dbgi, ir_entity *entity)
1080 {
1081         assert(entity != NULL);
1082         union symconst_symbol sym;
1083         sym.entity_p = entity;
1084         return new_d_SymConst(dbgi, mode_P, sym, symconst_addr_ent);
1085 }
1086
1087 static ir_node *create_Const_from_bool(ir_mode *const mode, bool const v)
1088 {
1089         return new_Const((v ? get_mode_one : get_mode_null)(mode));
1090 }
1091
1092 static ir_node *create_conv_from_b(dbg_info *dbgi, ir_node *value,
1093                                    ir_mode *dest_mode)
1094 {
1095         if (is_Const(value)) {
1096                 return create_Const_from_bool(dest_mode, !is_Const_null(value));
1097         }
1098
1099         ir_node *cond       = new_d_Cond(dbgi, value);
1100         ir_node *proj_true  = new_Proj(cond, mode_X, pn_Cond_true);
1101         ir_node *proj_false = new_Proj(cond, mode_X, pn_Cond_false);
1102         ir_node *tblock     = new_Block(1, &proj_true);
1103         ir_node *fblock     = new_Block(1, &proj_false);
1104         set_cur_block(tblock);
1105         ir_node *const1 = new_Const(get_mode_one(dest_mode));
1106         ir_node *tjump  = new_Jmp();
1107         set_cur_block(fblock);
1108         ir_node *const0 = new_Const(get_mode_null(dest_mode));
1109         ir_node *fjump  = new_Jmp();
1110
1111         ir_node *in[2]      = { tjump, fjump };
1112         ir_node *mergeblock = new_Block(2, in);
1113         set_cur_block(mergeblock);
1114         ir_node *phi_in[2]  = { const1, const0 };
1115         ir_node *phi        = new_Phi(2, phi_in, dest_mode);
1116         return phi;
1117 }
1118
1119 static ir_node *create_conv(dbg_info *dbgi, ir_node *value, ir_mode *dest_mode)
1120 {
1121         ir_mode *value_mode = get_irn_mode(value);
1122
1123         if (value_mode == dest_mode)
1124                 return value;
1125
1126         if (dest_mode == mode_b) {
1127                 ir_node *zero = new_Const(get_mode_null(value_mode));
1128                 ir_node *cmp  = new_d_Cmp(dbgi, value, zero, ir_relation_unordered_less_greater);
1129                 return cmp;
1130         } else if (value_mode == mode_b) {
1131                 return create_conv_from_b(dbgi, value, dest_mode);
1132         }
1133
1134         return new_d_Conv(dbgi, value, dest_mode);
1135 }
1136
1137 /**
1138  * Creates a SymConst node representing a string constant.
1139  *
1140  * @param src_pos    the source position of the string constant
1141  * @param id_prefix  a prefix for the name of the generated string constant
1142  * @param value      the value of the string constant
1143  */
1144 static ir_node *string_to_firm(position_t const *const src_pos, char const *const id_prefix, string_t const *const value)
1145 {
1146         size_t            const slen        = get_string_len(value) + 1;
1147         ir_initializer_t *const initializer = create_initializer_compound(slen);
1148         ir_type          *      elem_type;
1149         switch (value->encoding) {
1150         case STRING_ENCODING_CHAR:
1151         case STRING_ENCODING_UTF8: {
1152                 elem_type = ir_type_char;
1153
1154                 ir_mode *const mode = get_type_mode(elem_type);
1155                 char const    *p    = value->begin;
1156                 for (size_t i = 0; i < slen; ++i) {
1157                         ir_tarval        *tv  = new_tarval_from_long(*p++, mode);
1158                         ir_initializer_t *val = create_initializer_tarval(tv);
1159                         set_initializer_compound_value(initializer, i, val);
1160                 }
1161                 goto finish;
1162         }
1163
1164         {
1165                 type_t *type;
1166         case STRING_ENCODING_CHAR16: type = type_char16_t; goto init_wide;
1167         case STRING_ENCODING_CHAR32: type = type_char32_t; goto init_wide;
1168         case STRING_ENCODING_WIDE:   type = type_wchar_t;  goto init_wide;
1169 init_wide:;
1170                 elem_type = get_ir_type(type);
1171
1172                 ir_mode *const mode = get_type_mode(elem_type);
1173                 char const    *p    = value->begin;
1174                 for (size_t i = 0; i < slen; ++i) {
1175                         assert(p <= value->begin + value->size);
1176                         utf32             v   = read_utf8_char(&p);
1177                         ir_tarval        *tv  = new_tarval_from_long(v, mode);
1178                         ir_initializer_t *val = create_initializer_tarval(tv);
1179                         set_initializer_compound_value(initializer, i, val);
1180                 }
1181                 goto finish;
1182         }
1183         }
1184         panic("invalid string encoding");
1185
1186 finish:;
1187         ir_type *const type = new_type_array(1, elem_type);
1188         set_array_bounds_int(type, 0, 0, slen);
1189         set_type_size_bytes( type, slen * get_type_size_bytes(elem_type));
1190         set_type_state(      type, layout_fixed);
1191
1192         ir_type   *const global_type = get_glob_type();
1193         ident     *const id          = id_unique(id_prefix);
1194         dbg_info  *const dbgi        = get_dbg_info(src_pos);
1195         ir_entity *const entity      = new_d_entity(global_type, id, type, dbgi);
1196         set_entity_ld_ident(   entity, id);
1197         set_entity_visibility( entity, ir_visibility_private);
1198         add_entity_linkage(    entity, IR_LINKAGE_CONSTANT);
1199         set_entity_initializer(entity, initializer);
1200
1201         return create_symconst(dbgi, entity);
1202 }
1203
1204 static bool try_create_integer(literal_expression_t *literal, type_t *type)
1205 {
1206         assert(type->kind == TYPE_ATOMIC);
1207         atomic_type_kind_t akind = type->atomic.akind;
1208
1209         ir_mode    *const mode = atomic_modes[akind];
1210         char const *const str  = literal->value.begin;
1211         ir_tarval  *const tv   = new_tarval_from_str(str, literal->suffix - str, mode);
1212         if (tv == tarval_bad)
1213                 return false;
1214
1215         literal->base.type    = type;
1216         literal->target_value = tv;
1217         return true;
1218 }
1219
1220 void determine_literal_type(literal_expression_t *const literal)
1221 {
1222         assert(literal->base.kind == EXPR_LITERAL_INTEGER);
1223
1224         /* -1: signed only, 0: any, 1: unsigned only */
1225         int const sign =
1226                 !is_type_signed(literal->base.type) ? 1 :
1227                 literal->value.begin[0] == '0'      ? 0 :
1228                 -1; /* Decimal literals only try signed types. */
1229
1230         tarval_int_overflow_mode_t old_mode = tarval_get_integer_overflow_mode();
1231         tarval_set_integer_overflow_mode(TV_OVERFLOW_BAD);
1232
1233         if (try_create_integer(literal, literal->base.type))
1234                 goto finished;
1235
1236         /* now try if the constant is small enough for some types */
1237         if (sign >= 0 && try_create_integer(literal, type_unsigned_int))
1238                 goto finished;
1239         if (sign <= 0 && try_create_integer(literal, type_long))
1240                 goto finished;
1241         if (sign >= 0 && try_create_integer(literal, type_unsigned_long))
1242                 goto finished;
1243         /* last try? then we should not report tarval_bad */
1244         if (sign < 0)
1245                 tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
1246         if (sign <= 0 && try_create_integer(literal, type_long_long))
1247                 goto finished;
1248
1249         /* last try */
1250         assert(sign >= 0);
1251         tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
1252         bool res = try_create_integer(literal, type_unsigned_long_long);
1253         if (!res)
1254                 panic("internal error when parsing number literal");
1255
1256 finished:
1257         tarval_set_integer_overflow_mode(old_mode);
1258 }
1259
1260 /**
1261  * Creates a Const node representing a constant.
1262  */
1263 static ir_node *literal_to_firm(const literal_expression_t *literal)
1264 {
1265         type_t     *type   = skip_typeref(literal->base.type);
1266         ir_mode    *mode   = get_ir_mode_storage(type);
1267         const char *string = literal->value.begin;
1268         size_t      size   = literal->value.size;
1269         ir_tarval  *tv;
1270
1271         switch (literal->base.kind) {
1272         case EXPR_LITERAL_INTEGER:
1273                 assert(literal->target_value != NULL);
1274                 tv = literal->target_value;
1275                 break;
1276
1277         case EXPR_LITERAL_FLOATINGPOINT:
1278                 tv = new_tarval_from_str(string, size, mode);
1279                 break;
1280
1281         case EXPR_LITERAL_BOOLEAN:
1282                 if (string[0] == 't') {
1283                         tv = get_mode_one(mode);
1284                 } else {
1285                         assert(string[0] == 'f');
1286         case EXPR_LITERAL_MS_NOOP:
1287                         tv = get_mode_null(mode);
1288                 }
1289                 break;
1290
1291         default:
1292                 panic("invalid literal kind");
1293         }
1294
1295         dbg_info *dbgi       = get_dbg_info(&literal->base.pos);
1296         ir_node  *res        = new_d_Const(dbgi, tv);
1297         ir_mode  *mode_arith = get_ir_mode_arithmetic(type);
1298         return create_conv(dbgi, res, mode_arith);
1299 }
1300
1301 /**
1302  * Creates a Const node representing a character constant.
1303  */
1304 static ir_node *char_literal_to_firm(string_literal_expression_t const *literal)
1305 {
1306         type_t     *type   = skip_typeref(literal->base.type);
1307         ir_mode    *mode   = get_ir_mode_storage(type);
1308         const char *string = literal->value.begin;
1309         size_t      size   = literal->value.size;
1310         ir_tarval  *tv;
1311
1312         switch (literal->value.encoding) {
1313         case STRING_ENCODING_WIDE: {
1314                 utf32  v = read_utf8_char(&string);
1315                 char   buf[128];
1316                 size_t len = snprintf(buf, sizeof(buf), UTF32_PRINTF_FORMAT, v);
1317
1318                 tv = new_tarval_from_str(buf, len, mode);
1319                 break;
1320         }
1321
1322         case STRING_ENCODING_CHAR: {
1323                 long long int v;
1324                 bool char_is_signed
1325                         = get_atomic_type_flags(ATOMIC_TYPE_CHAR) & ATOMIC_TYPE_FLAG_SIGNED;
1326                 if (size == 1 && char_is_signed) {
1327                         v = (signed char)string[0];
1328                 } else {
1329                         v = 0;
1330                         for (size_t i = 0; i < size; ++i) {
1331                                 v = (v << 8) | ((unsigned char)string[i]);
1332                         }
1333                 }
1334                 char   buf[128];
1335                 size_t len = snprintf(buf, sizeof(buf), "%lld", v);
1336
1337                 tv = new_tarval_from_str(buf, len, mode);
1338                 break;
1339         }
1340
1341         default:
1342                 panic("invalid literal kind");
1343         }
1344
1345         dbg_info *dbgi       = get_dbg_info(&literal->base.pos);
1346         ir_node  *res        = new_d_Const(dbgi, tv);
1347         ir_mode  *mode_arith = get_ir_mode_arithmetic(type);
1348         return create_conv(dbgi, res, mode_arith);
1349 }
1350
1351 /*
1352  * Allocate an area of size bytes aligned at alignment
1353  * at a frame type.
1354  */
1355 static ir_entity *alloc_trampoline(ir_type *frame_type, int size, unsigned alignment)
1356 {
1357         static unsigned area_cnt = 0;
1358         char buf[32];
1359
1360         ir_type *tp = new_type_array(1, ir_type_char);
1361         set_array_bounds_int(tp, 0, 0, size);
1362         set_type_alignment_bytes(tp, alignment);
1363
1364         snprintf(buf, sizeof(buf), "trampolin%u", area_cnt++);
1365         ident *name = new_id_from_str(buf);
1366         ir_entity *area = new_entity(frame_type, name, tp);
1367
1368         /* mark this entity as compiler generated */
1369         set_entity_compiler_generated(area, 1);
1370         return area;
1371 }
1372
1373 /**
1374  * Return a node representing a trampoline region
1375  * for a given function entity.
1376  *
1377  * @param dbgi    debug info
1378  * @param entity  the function entity
1379  */
1380 static ir_node *get_trampoline_region(dbg_info *dbgi, ir_entity *entity)
1381 {
1382         ir_entity *region = NULL;
1383         int        i;
1384
1385         if (current_trampolines != NULL) {
1386                 for (i = ARR_LEN(current_trampolines) - 1; i >= 0; --i) {
1387                         if (current_trampolines[i].function == entity) {
1388                                 region = current_trampolines[i].region;
1389                                 break;
1390                         }
1391                 }
1392         } else {
1393                 current_trampolines = NEW_ARR_F(trampoline_region, 0);
1394         }
1395         ir_graph *irg = current_ir_graph;
1396         if (region == NULL) {
1397                 /* create a new region */
1398                 ir_type           *frame_tp = get_irg_frame_type(irg);
1399                 trampoline_region  reg;
1400                 reg.function = entity;
1401
1402                 reg.region   = alloc_trampoline(frame_tp,
1403                                                 be_params->trampoline_size,
1404                                                 be_params->trampoline_align);
1405                 ARR_APP1(trampoline_region, current_trampolines, reg);
1406                 region = reg.region;
1407         }
1408         return new_d_simpleSel(dbgi, get_irg_no_mem(irg), get_irg_frame(irg),
1409                                region);
1410 }
1411
1412 /**
1413  * Creates a trampoline for a function represented by an entity.
1414  *
1415  * @param dbgi    debug info
1416  * @param mode    the (reference) mode for the function address
1417  * @param entity  the function entity
1418  */
1419 static ir_node *create_trampoline(dbg_info *dbgi, ir_mode *mode,
1420                                   ir_entity *entity)
1421 {
1422         assert(entity != NULL);
1423         ir_node *in[3];
1424         in[0] = get_trampoline_region(dbgi, entity);
1425         in[1] = create_symconst(dbgi, entity);
1426         in[2] = get_irg_frame(current_ir_graph);
1427
1428         ir_node *irn = new_d_Builtin(dbgi, get_store(), 3, in, ir_bk_inner_trampoline, get_unknown_type());
1429         set_store(new_Proj(irn, mode_M, pn_Builtin_M));
1430         return new_Proj(irn, mode, pn_Builtin_max+1);
1431 }
1432
1433 /**
1434  * Dereference an address.
1435  *
1436  * @param dbgi  debug info
1437  * @param type  the type of the dereferenced result (the points_to type)
1438  * @param addr  the address to dereference
1439  */
1440 static ir_node *deref_address(dbg_info *const dbgi, type_t *const type,
1441                                       ir_node *const addr)
1442 {
1443         type_t *skipped = skip_typeref(type);
1444         if (is_type_incomplete(skipped))
1445                 return addr;
1446
1447         ir_type *irtype = get_ir_type(skipped);
1448         if (is_compound_type(irtype)
1449             || is_Method_type(irtype)
1450             || is_Array_type(irtype)) {
1451                 return addr;
1452         }
1453
1454         ir_cons_flags  flags    = skipped->base.qualifiers & TYPE_QUALIFIER_VOLATILE
1455                                   ? cons_volatile : cons_none;
1456         ir_mode *const mode     = get_type_mode(irtype);
1457         ir_node *const memory   = get_store();
1458         ir_node *const load     = new_d_Load(dbgi, memory, addr, mode, flags);
1459         ir_node *const load_mem = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1460         ir_node *const load_res = new_d_Proj(dbgi, load, mode,   pn_Load_res);
1461
1462         set_store(load_mem);
1463
1464         ir_mode *const mode_arithmetic = get_ir_mode_arithmetic(skipped);
1465         return create_conv(dbgi, load_res, mode_arithmetic);
1466 }
1467
1468 /**
1469  * Returns the correct base address depending on whether it is a parameter or a
1470  * normal local variable.
1471  */
1472 static ir_node *get_local_frame(ir_entity *const ent)
1473 {
1474         ir_graph      *const irg   = current_ir_graph;
1475         const ir_type *const owner = get_entity_owner(ent);
1476         if (owner == current_outer_frame) {
1477                 assert(current_static_link != NULL);
1478                 return current_static_link;
1479         } else {
1480                 return get_irg_frame(irg);
1481         }
1482 }
1483
1484 /**
1485  * Keep the current block and memory.
1486  * This is necessary for all loops, because they could become infinite.
1487  */
1488 static void keep_loop(void)
1489 {
1490         keep_alive(get_cur_block());
1491         keep_alive(get_store());
1492 }
1493
1494 static ir_node *enum_constant_to_firm(reference_expression_t const *const ref)
1495 {
1496         entity_t *entity = ref->entity;
1497         if (entity->enum_value.tv == NULL) {
1498                 type_t *type = skip_typeref(entity->enum_value.enum_type);
1499                 assert(type->kind == TYPE_ENUM);
1500                 determine_enum_values(&type->enumt);
1501         }
1502
1503         return new_Const(entity->enum_value.tv);
1504 }
1505
1506 static ir_node *reference_addr(const reference_expression_t *ref)
1507 {
1508         dbg_info *dbgi   = get_dbg_info(&ref->base.pos);
1509         entity_t *entity = ref->entity;
1510         assert(is_declaration(entity));
1511
1512         if (entity->kind == ENTITY_FUNCTION
1513             && entity->function.btk != BUILTIN_NONE) {
1514                 ir_entity *irentity = get_function_entity(entity, NULL);
1515                 /* for gcc compatibility we have to produce (dummy) addresses for some
1516                  * builtins which don't have entities */
1517                 if (irentity == NULL) {
1518                         position_t const *const pos = &ref->base.pos;
1519                         warningf(WARN_OTHER, pos, "taking address of builtin '%N'", ref->entity);
1520
1521                         /* simply create a NULL pointer */
1522                         ir_mode  *mode = get_ir_mode_arithmetic(type_void_ptr);
1523                         ir_node  *res  = new_Const(get_mode_null(mode));
1524
1525                         return res;
1526                 }
1527         }
1528
1529         switch((declaration_kind_t) entity->declaration.kind) {
1530         case DECLARATION_KIND_UNKNOWN:
1531                 break;
1532         case DECLARATION_KIND_PARAMETER:
1533         case DECLARATION_KIND_LOCAL_VARIABLE:
1534                 /* you can store to a local variable (so we don't panic but return NULL
1535                  * as an indicator for no real address) */
1536                 return NULL;
1537         case DECLARATION_KIND_GLOBAL_VARIABLE: {
1538                 ir_node *const addr = create_symconst(dbgi, entity->variable.v.entity);
1539                 return addr;
1540         }
1541
1542         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY:
1543         case DECLARATION_KIND_PARAMETER_ENTITY: {
1544                 ir_entity *irentity = entity->variable.v.entity;
1545                 ir_node   *frame    = get_local_frame(irentity);
1546                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1547                 return sel;
1548         }
1549
1550         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
1551                 return entity->variable.v.vla_base;
1552
1553         case DECLARATION_KIND_FUNCTION: {
1554                 return create_symconst(dbgi, entity->function.irentity);
1555         }
1556
1557         case DECLARATION_KIND_INNER_FUNCTION: {
1558                 type_t  *const type = skip_typeref(entity->declaration.type);
1559                 ir_mode *const mode = get_ir_mode_storage(type);
1560                 if (!entity->function.goto_to_outer && !entity->function.need_closure) {
1561                         /* inner function not using the closure */
1562                         return create_symconst(dbgi, entity->function.irentity);
1563                 } else {
1564                         /* need trampoline here */
1565                         return create_trampoline(dbgi, mode, entity->function.irentity);
1566                 }
1567         }
1568
1569         case DECLARATION_KIND_COMPOUND_MEMBER:
1570                 panic("not implemented reference type");
1571         }
1572
1573         panic("reference to declaration with unknown type");
1574 }
1575
1576 static ir_node *reference_expression_to_firm(const reference_expression_t *ref)
1577 {
1578         dbg_info *const dbgi   = get_dbg_info(&ref->base.pos);
1579         entity_t *const entity = ref->entity;
1580         assert(is_declaration(entity));
1581
1582         switch ((declaration_kind_t)entity->declaration.kind) {
1583         case DECLARATION_KIND_LOCAL_VARIABLE:
1584         case DECLARATION_KIND_PARAMETER: {
1585                 type_t  *const type  = skip_typeref(entity->declaration.type);
1586                 ir_mode *const mode  = get_ir_mode_storage(type);
1587                 ir_node *const value = get_value(entity->variable.v.value_number, mode);
1588                 return create_conv(dbgi, value, get_ir_mode_arithmetic(type));
1589         }
1590
1591         default: {
1592                 ir_node *const addr = reference_addr(ref);
1593                 return deref_address(dbgi, entity->declaration.type, addr);
1594         }
1595         }
1596 }
1597
1598 /**
1599  * Transform calls to builtin functions.
1600  */
1601 static ir_node *process_builtin_call(const call_expression_t *call)
1602 {
1603         dbg_info *dbgi = get_dbg_info(&call->base.pos);
1604
1605         assert(call->function->kind == EXPR_REFERENCE);
1606         reference_expression_t *builtin = &call->function->reference;
1607
1608         type_t *expr_type = skip_typeref(builtin->base.type);
1609         assert(is_type_pointer(expr_type));
1610
1611         type_t *function_type = skip_typeref(expr_type->pointer.points_to);
1612
1613         switch (builtin->entity->function.btk) {
1614         case BUILTIN_NONE:
1615                 break;
1616         case BUILTIN_ALLOCA: {
1617                 expression_t *argument = call->arguments->expression;
1618                 ir_node      *size     = expression_to_firm(argument);
1619
1620                 ir_node *store  = get_store();
1621                 ir_node *alloca = new_d_Alloc(dbgi, store, size, get_unknown_type(),
1622                                               stack_alloc);
1623                 ir_node *proj_m = new_Proj(alloca, mode_M, pn_Alloc_M);
1624                 set_store(proj_m);
1625                 ir_node *res    = new_Proj(alloca, mode_P_data, pn_Alloc_res);
1626
1627                 return res;
1628         }
1629         case BUILTIN_INF: {
1630                 type_t    *type = function_type->function.return_type;
1631                 ir_mode   *mode = get_ir_mode_arithmetic(type);
1632                 ir_tarval *tv   = get_mode_infinite(mode);
1633                 ir_node   *res  = new_d_Const(dbgi, tv);
1634                 return res;
1635         }
1636         case BUILTIN_NAN: {
1637                 /* Ignore string for now... */
1638                 assert(is_type_function(function_type));
1639                 type_t    *type = function_type->function.return_type;
1640                 ir_mode   *mode = get_ir_mode_arithmetic(type);
1641                 ir_tarval *tv   = get_mode_NAN(mode);
1642                 ir_node   *res  = new_d_Const(dbgi, tv);
1643                 return res;
1644         }
1645         case BUILTIN_EXPECT: {
1646                 expression_t *argument = call->arguments->expression;
1647                 return _expression_to_firm(argument);
1648         }
1649         case BUILTIN_VA_END:
1650                 /* evaluate the argument of va_end for its side effects */
1651                 _expression_to_firm(call->arguments->expression);
1652                 return NULL;
1653         case BUILTIN_OBJECT_SIZE: {
1654                 /* determine value of "type" */
1655                 expression_t *type_expression = call->arguments->next->expression;
1656                 long          type_val        = fold_constant_to_int(type_expression);
1657                 type_t       *type            = function_type->function.return_type;
1658                 ir_mode      *mode            = get_ir_mode_arithmetic(type);
1659                 /* just produce a "I don't know" result */
1660                 ir_tarval    *result          = type_val & 2 ? get_mode_null(mode) :
1661                                                 get_mode_minus_one(mode);
1662
1663                 return new_d_Const(dbgi, result);
1664         }
1665         case BUILTIN_ROTL: {
1666                 ir_node *val  = expression_to_firm(call->arguments->expression);
1667                 ir_node *shf  = expression_to_firm(call->arguments->next->expression);
1668                 ir_mode *mode = get_irn_mode(val);
1669                 ir_mode *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1670                 return new_d_Rotl(dbgi, val, create_conv(dbgi, shf, mode_uint), mode);
1671         }
1672         case BUILTIN_ROTR: {
1673                 ir_node *val  = expression_to_firm(call->arguments->expression);
1674                 ir_node *shf  = expression_to_firm(call->arguments->next->expression);
1675                 ir_mode *mode = get_irn_mode(val);
1676                 ir_mode *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1677                 ir_node *c    = new_Const_long(mode_uint, get_mode_size_bits(mode));
1678                 ir_node *sub  = new_d_Sub(dbgi, c, create_conv(dbgi, shf, mode_uint), mode_uint);
1679                 return new_d_Rotl(dbgi, val, sub, mode);
1680         }
1681         case BUILTIN_FIRM:
1682                 break;
1683         case BUILTIN_LIBC:
1684         case BUILTIN_LIBC_CHECK:
1685                 panic("builtin did not produce an entity");
1686         }
1687         panic("invalid builtin");
1688 }
1689
1690 /**
1691  * Transform a call expression.
1692  * Handles some special cases, like alloca() calls, which must be resolved
1693  * BEFORE the inlines runs. Inlining routines calling alloca() is dangerous,
1694  * 176.gcc for instance might allocate 2GB instead of 256 MB if alloca is not
1695  * handled right...
1696  */
1697 static ir_node *call_expression_to_firm(const call_expression_t *const call)
1698 {
1699         dbg_info *const dbgi = get_dbg_info(&call->base.pos);
1700         assert(currently_reachable());
1701
1702         expression_t   *function = call->function;
1703         ir_node        *callee   = NULL;
1704         bool            firm_builtin = false;
1705         ir_builtin_kind firm_builtin_kind = ir_bk_trap;
1706         if (function->kind == EXPR_REFERENCE) {
1707                 const reference_expression_t *ref    = &function->reference;
1708                 entity_t                     *entity = ref->entity;
1709
1710                 if (entity->kind == ENTITY_FUNCTION) {
1711                         builtin_kind_t builtin = entity->function.btk;
1712                         if (builtin == BUILTIN_FIRM) {
1713                                 firm_builtin = true;
1714                                 firm_builtin_kind = entity->function.b.firm_builtin_kind;
1715                         } else if (builtin != BUILTIN_NONE && builtin != BUILTIN_LIBC
1716                                    && builtin != BUILTIN_LIBC_CHECK) {
1717                                 return process_builtin_call(call);
1718                         }
1719                 }
1720         }
1721         if (!firm_builtin)
1722                 callee = expression_to_firm(function);
1723
1724         type_t *type = skip_typeref(function->base.type);
1725         assert(is_type_pointer(type));
1726         pointer_type_t *pointer_type = &type->pointer;
1727         type_t         *points_to    = skip_typeref(pointer_type->points_to);
1728         assert(is_type_function(points_to));
1729         function_type_t *function_type = &points_to->function;
1730
1731         int      n_parameters    = 0;
1732         ir_type *ir_method_type  = get_ir_type((type_t*) function_type);
1733         ir_type *new_method_type = NULL;
1734         if (function_type->variadic || function_type->unspecified_parameters) {
1735                 const call_argument_t *argument = call->arguments;
1736                 for ( ; argument != NULL; argument = argument->next) {
1737                         ++n_parameters;
1738                 }
1739
1740                 /* we need to construct a new method type matching the call
1741                  * arguments... */
1742                 type_dbg_info *tdbgi = get_type_dbg_info_((const type_t*) function_type);
1743                 int n_res       = get_method_n_ress(ir_method_type);
1744                 new_method_type = new_d_type_method(n_parameters, n_res, tdbgi);
1745                 set_method_calling_convention(new_method_type,
1746                                get_method_calling_convention(ir_method_type));
1747                 set_method_additional_properties(new_method_type,
1748                                get_method_additional_properties(ir_method_type));
1749                 set_method_variadicity(new_method_type,
1750                                        get_method_variadicity(ir_method_type));
1751
1752                 for (int i = 0; i < n_res; ++i) {
1753                         set_method_res_type(new_method_type, i,
1754                                             get_method_res_type(ir_method_type, i));
1755                 }
1756                 argument = call->arguments;
1757                 for (int i = 0; i < n_parameters; ++i, argument = argument->next) {
1758                         expression_t *expression = argument->expression;
1759                         ir_type      *irtype     = get_ir_type(expression->base.type);
1760                         set_method_param_type(new_method_type, i, irtype);
1761                 }
1762                 ir_method_type = new_method_type;
1763         } else {
1764                 n_parameters = get_method_n_params(ir_method_type);
1765         }
1766
1767         ir_node *in[n_parameters];
1768
1769         const call_argument_t *argument = call->arguments;
1770         for (int n = 0; n < n_parameters; ++n) {
1771                 expression_t *expression = argument->expression;
1772                 ir_node      *arg_node   = expression_to_firm(expression);
1773
1774                 type_t *arg_type = skip_typeref(expression->base.type);
1775                 if (!is_type_compound(arg_type)) {
1776                         ir_mode *const mode = get_ir_mode_storage(arg_type);
1777                         arg_node = create_conv(dbgi, arg_node, mode);
1778                 }
1779
1780                 in[n] = arg_node;
1781
1782                 argument = argument->next;
1783         }
1784
1785         ir_node *store;
1786         if (function_type->modifiers & DM_CONST) {
1787                 store = get_irg_no_mem(current_ir_graph);
1788         } else {
1789                 store = get_store();
1790         }
1791
1792         ir_node *node;
1793         type_t  *return_type = skip_typeref(function_type->return_type);
1794         ir_node *result      = NULL;
1795         if (firm_builtin) {
1796                 node = new_d_Builtin(dbgi, store, n_parameters, in, firm_builtin_kind,
1797                                      ir_method_type);
1798                 if (! (function_type->modifiers & DM_CONST)) {
1799                         ir_node *mem = new_Proj(node, mode_M, pn_Builtin_M);
1800                         set_store(mem);
1801                 }
1802
1803                 if (!is_type_void(return_type)) {
1804                         assert(is_type_scalar(return_type));
1805                         ir_mode *mode = get_ir_mode_storage(return_type);
1806                         result = new_Proj(node, mode, pn_Builtin_max+1);
1807                         ir_mode *mode_arith = get_ir_mode_arithmetic(return_type);
1808                         result              = create_conv(NULL, result, mode_arith);
1809                 }
1810         } else {
1811                 node = new_d_Call(dbgi, store, callee, n_parameters, in, ir_method_type);
1812                 if (! (function_type->modifiers & DM_CONST)) {
1813                         ir_node *mem = new_Proj(node, mode_M, pn_Call_M);
1814                         set_store(mem);
1815                 }
1816
1817                 if (!is_type_void(return_type)) {
1818                         ir_node *const resproj    = new_Proj(node, mode_T, pn_Call_T_result);
1819                         ir_mode *const mode       = get_ir_mode_storage(return_type);
1820                         result                    = new_Proj(resproj, mode, 0);
1821                         ir_mode *const mode_arith = get_ir_mode_arithmetic(return_type);
1822                         result                    = create_conv(NULL, result, mode_arith);
1823                 }
1824         }
1825
1826         if (function_type->modifiers & DM_NORETURN) {
1827                 /* A dead end:  Keep the Call and the Block.  Also place all further
1828                  * nodes into a new and unreachable block. */
1829                 keep_alive(node);
1830                 keep_alive(get_cur_block());
1831                 ir_node *block = new_Block(0, NULL);
1832                 set_cur_block(block);
1833         }
1834
1835         return result;
1836 }
1837
1838 static ir_node *statement_to_firm(statement_t *statement);
1839 static ir_node *compound_statement_to_firm(compound_statement_t *compound);
1840
1841 static ir_node *expression_to_addr(const expression_t *expression);
1842 static ir_node *create_condition_evaluation(expression_t const *expression, jump_target *true_target, jump_target *false_target);
1843
1844 static void assign_value(dbg_info *dbgi, ir_node *addr, type_t *type,
1845                          ir_node *value)
1846 {
1847         if (is_type_scalar(type)) {
1848                 ir_mode *mode = get_ir_mode_storage(type);
1849                 value         = create_conv(dbgi, value, mode);
1850         }
1851
1852         ir_node *memory = get_store();
1853
1854         if (is_type_scalar(type)) {
1855                 ir_cons_flags flags = type->base.qualifiers & TYPE_QUALIFIER_VOLATILE
1856                                       ? cons_volatile : cons_none;
1857                 ir_node  *store     = new_d_Store(dbgi, memory, addr, value, flags);
1858                 ir_node  *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
1859                 set_store(store_mem);
1860         } else {
1861                 ir_type *irtype    = get_ir_type(type);
1862                 ir_node *copyb     = new_d_CopyB(dbgi, memory, addr, value, irtype);
1863                 ir_node *copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
1864                 set_store(copyb_mem);
1865         }
1866 }
1867
1868 static ir_tarval *create_bitfield_mask(ir_mode *mode, int offset, int size)
1869 {
1870         ir_tarval *all_one   = get_mode_all_one(mode);
1871         int        mode_size = get_mode_size_bits(mode);
1872         ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1873
1874         assert(offset >= 0);
1875         assert(size   >= 0);
1876         assert(offset + size <= mode_size);
1877         if (size == mode_size) {
1878                 return all_one;
1879         }
1880
1881         long       shiftr    = get_mode_size_bits(mode) - size;
1882         long       shiftl    = offset;
1883         ir_tarval *tv_shiftr = new_tarval_from_long(shiftr, mode_uint);
1884         ir_tarval *tv_shiftl = new_tarval_from_long(shiftl, mode_uint);
1885         ir_tarval *mask0     = tarval_shr(all_one, tv_shiftr);
1886         ir_tarval *mask1     = tarval_shl(mask0, tv_shiftl);
1887
1888         return mask1;
1889 }
1890
1891 static ir_node *bitfield_store_to_firm(dbg_info *dbgi,
1892                 ir_entity *entity, ir_node *addr, ir_node *value, bool set_volatile,
1893                 bool need_return)
1894 {
1895         ir_type *entity_type = get_entity_type(entity);
1896         ir_type *base_type   = get_primitive_base_type(entity_type);
1897         ir_mode *mode        = get_type_mode(base_type);
1898         ir_mode *mode_uint   = atomic_modes[ATOMIC_TYPE_UINT];
1899
1900         value = create_conv(dbgi, value, mode);
1901
1902         /* kill upper bits of value and shift to right position */
1903         unsigned  bitoffset  = get_entity_offset_bits_remainder(entity);
1904         unsigned  bitsize    = get_mode_size_bits(get_type_mode(entity_type));
1905         unsigned  base_bits  = get_mode_size_bits(mode);
1906         unsigned  shiftwidth = base_bits - bitsize;
1907
1908         ir_node  *shiftcount = new_Const_long(mode_uint, shiftwidth);
1909         ir_node  *shiftl     = new_d_Shl(dbgi, value, shiftcount, mode);
1910
1911         unsigned  shrwidth   = base_bits - bitsize - bitoffset;
1912         ir_node  *shrconst   = new_Const_long(mode_uint, shrwidth);
1913         ir_node  *shiftr     = new_d_Shr(dbgi, shiftl, shrconst, mode);
1914
1915         /* load current value */
1916         ir_node   *mem             = get_store();
1917         ir_node   *load            = new_d_Load(dbgi, mem, addr, mode,
1918                                           set_volatile ? cons_volatile : cons_none);
1919         ir_node   *load_mem        = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1920         ir_node   *load_res        = new_d_Proj(dbgi, load, mode, pn_Load_res);
1921         ir_tarval *shift_mask      = create_bitfield_mask(mode, bitoffset, bitsize);
1922         ir_tarval *inv_mask        = tarval_not(shift_mask);
1923         ir_node   *inv_mask_node   = new_d_Const(dbgi, inv_mask);
1924         ir_node   *load_res_masked = new_d_And(dbgi, load_res, inv_mask_node, mode);
1925
1926         /* construct new value and store */
1927         ir_node *new_val   = new_d_Or(dbgi, load_res_masked, shiftr, mode);
1928         ir_node *store     = new_d_Store(dbgi, load_mem, addr, new_val,
1929                                          set_volatile ? cons_volatile : cons_none);
1930         ir_node *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
1931         set_store(store_mem);
1932
1933         if (!need_return)
1934                 return NULL;
1935
1936         ir_node *res_shr;
1937         ir_node *count_res_shr = new_Const_long(mode_uint, base_bits - bitsize);
1938         if (mode_is_signed(mode)) {
1939                 res_shr = new_d_Shrs(dbgi, shiftl, count_res_shr, mode);
1940         } else {
1941                 res_shr = new_d_Shr(dbgi, shiftl, count_res_shr, mode);
1942         }
1943         return res_shr;
1944 }
1945
1946 static ir_node *bitfield_extract_to_firm(const select_expression_t *expression,
1947                                          ir_node *addr)
1948 {
1949         dbg_info *dbgi      = get_dbg_info(&expression->base.pos);
1950         entity_t *entity    = expression->compound_entry;
1951         type_t   *base_type = entity->declaration.type;
1952         ir_mode  *mode      = get_ir_mode_storage(base_type);
1953         ir_node  *mem       = get_store();
1954         ir_node  *load      = new_d_Load(dbgi, mem, addr, mode, cons_none);
1955         ir_node  *load_mem  = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1956         ir_node  *load_res  = new_d_Proj(dbgi, load, mode, pn_Load_res);
1957         ir_mode  *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1958
1959         ir_mode  *amode     = mode;
1960         /* optimisation, since shifting in modes < machine_size is usually
1961          * less efficient */
1962         if (get_mode_size_bits(amode) < get_mode_size_bits(mode_uint)) {
1963                 amode = mode_uint;
1964         }
1965         unsigned amode_size = get_mode_size_bits(amode);
1966         load_res = create_conv(dbgi, load_res, amode);
1967
1968         set_store(load_mem);
1969
1970         /* kill upper bits */
1971         assert(expression->compound_entry->kind == ENTITY_COMPOUND_MEMBER);
1972         unsigned   bitoffset   = entity->compound_member.bit_offset;
1973         unsigned   bitsize     = entity->compound_member.bit_size;
1974         unsigned   shift_bitsl = amode_size - bitoffset - bitsize;
1975         ir_tarval *tvl         = new_tarval_from_long((long)shift_bitsl, mode_uint);
1976         ir_node   *countl      = new_d_Const(dbgi, tvl);
1977         ir_node   *shiftl      = new_d_Shl(dbgi, load_res, countl, amode);
1978
1979         unsigned   shift_bitsr = bitoffset + shift_bitsl;
1980         assert(shift_bitsr <= amode_size);
1981         ir_tarval *tvr         = new_tarval_from_long((long)shift_bitsr, mode_uint);
1982         ir_node   *countr      = new_d_Const(dbgi, tvr);
1983         ir_node   *shiftr;
1984         if (mode_is_signed(mode)) {
1985                 shiftr = new_d_Shrs(dbgi, shiftl, countr, amode);
1986         } else {
1987                 shiftr = new_d_Shr(dbgi, shiftl, countr, amode);
1988         }
1989
1990         type_t  *type    = expression->base.type;
1991         ir_mode *resmode = get_ir_mode_arithmetic(type);
1992         return create_conv(dbgi, shiftr, resmode);
1993 }
1994
1995 /* make sure the selected compound type is constructed */
1996 static void construct_select_compound(const select_expression_t *expression)
1997 {
1998         type_t *type = skip_typeref(expression->compound->base.type);
1999         if (is_type_pointer(type)) {
2000                 type = type->pointer.points_to;
2001         }
2002         (void) get_ir_type(type);
2003 }
2004
2005 static ir_node *set_value_for_expression_addr(const expression_t *expression,
2006                                               ir_node *value, ir_node *addr)
2007 {
2008         dbg_info *dbgi = get_dbg_info(&expression->base.pos);
2009         type_t   *type = skip_typeref(expression->base.type);
2010
2011         if (!is_type_compound(type)) {
2012                 ir_mode  *mode = get_ir_mode_storage(type);
2013                 value          = create_conv(dbgi, value, mode);
2014         }
2015
2016         if (expression->kind == EXPR_REFERENCE) {
2017                 const reference_expression_t *ref = &expression->reference;
2018
2019                 entity_t *entity = ref->entity;
2020                 assert(is_declaration(entity));
2021                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2022                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE ||
2023                     entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
2024                         set_value(entity->variable.v.value_number, value);
2025                         return value;
2026                 }
2027         }
2028
2029         if (addr == NULL)
2030                 addr = expression_to_addr(expression);
2031         assert(addr != NULL);
2032
2033         if (expression->kind == EXPR_SELECT) {
2034                 const select_expression_t *select = &expression->select;
2035
2036                 construct_select_compound(select);
2037
2038                 entity_t *entity = select->compound_entry;
2039                 assert(entity->kind == ENTITY_COMPOUND_MEMBER);
2040                 if (entity->compound_member.bitfield) {
2041                         ir_entity *irentity = entity->compound_member.entity;
2042                         bool       set_volatile
2043                                 = select->base.type->base.qualifiers & TYPE_QUALIFIER_VOLATILE;
2044                         value = bitfield_store_to_firm(dbgi, irentity, addr, value,
2045                                                        set_volatile, true);
2046                         return value;
2047                 }
2048         }
2049
2050         assign_value(dbgi, addr, type, value);
2051         return value;
2052 }
2053
2054 static void set_value_for_expression(const expression_t *expression,
2055                                      ir_node *value)
2056 {
2057         set_value_for_expression_addr(expression, value, NULL);
2058 }
2059
2060 static ir_node *get_value_from_lvalue(const expression_t *expression,
2061                                       ir_node *addr)
2062 {
2063         if (expression->kind == EXPR_REFERENCE) {
2064                 const reference_expression_t *ref = &expression->reference;
2065
2066                 entity_t *entity = ref->entity;
2067                 assert(entity->kind == ENTITY_VARIABLE
2068                                 || entity->kind == ENTITY_PARAMETER);
2069                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2070                 int value_number;
2071                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE ||
2072                     entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
2073                         value_number = entity->variable.v.value_number;
2074                         assert(addr == NULL);
2075                         type_t  *type = skip_typeref(expression->base.type);
2076                         ir_mode *mode = get_ir_mode_storage(type);
2077                         ir_node *res  = get_value(value_number, mode);
2078                         return create_conv(NULL, res, get_ir_mode_arithmetic(type));
2079                 }
2080         }
2081
2082         assert(addr != NULL);
2083         dbg_info *dbgi = get_dbg_info(&expression->base.pos);
2084
2085         ir_node *value;
2086         if (expression->kind == EXPR_SELECT &&
2087             expression->select.compound_entry->compound_member.bitfield) {
2088             construct_select_compound(&expression->select);
2089                 value = bitfield_extract_to_firm(&expression->select, addr);
2090         } else {
2091                 value = deref_address(dbgi, expression->base.type, addr);
2092         }
2093
2094         return value;
2095 }
2096
2097
2098 static ir_node *create_incdec(const unary_expression_t *expression)
2099 {
2100         dbg_info *const     dbgi = get_dbg_info(&expression->base.pos);
2101         const expression_t *value_expr = expression->value;
2102         ir_node            *addr       = expression_to_addr(value_expr);
2103         ir_node            *value      = get_value_from_lvalue(value_expr, addr);
2104
2105         type_t  *type = skip_typeref(expression->base.type);
2106         ir_mode *mode = get_ir_mode_arithmetic(expression->base.type);
2107
2108         ir_node *offset;
2109         if (is_type_pointer(type)) {
2110                 pointer_type_t *pointer_type = &type->pointer;
2111                 offset = get_type_size_node(pointer_type->points_to);
2112         } else {
2113                 assert(is_type_arithmetic(type));
2114                 offset = new_Const(get_mode_one(mode));
2115         }
2116
2117         ir_node *result;
2118         ir_node *store_value;
2119         switch(expression->base.kind) {
2120         case EXPR_UNARY_POSTFIX_INCREMENT:
2121                 result      = value;
2122                 store_value = new_d_Add(dbgi, value, offset, mode);
2123                 break;
2124         case EXPR_UNARY_POSTFIX_DECREMENT:
2125                 result      = value;
2126                 store_value = new_d_Sub(dbgi, value, offset, mode);
2127                 break;
2128         case EXPR_UNARY_PREFIX_INCREMENT:
2129                 result      = new_d_Add(dbgi, value, offset, mode);
2130                 store_value = result;
2131                 break;
2132         case EXPR_UNARY_PREFIX_DECREMENT:
2133                 result      = new_d_Sub(dbgi, value, offset, mode);
2134                 store_value = result;
2135                 break;
2136         default:
2137                 panic("no incdec expr");
2138         }
2139
2140         set_value_for_expression_addr(value_expr, store_value, addr);
2141
2142         return result;
2143 }
2144
2145 static bool is_local_variable(expression_t *expression)
2146 {
2147         if (expression->kind != EXPR_REFERENCE)
2148                 return false;
2149         reference_expression_t *ref_expr = &expression->reference;
2150         entity_t               *entity   = ref_expr->entity;
2151         if (entity->kind != ENTITY_VARIABLE)
2152                 return false;
2153         assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2154         return entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE;
2155 }
2156
2157 static ir_relation get_relation(const expression_kind_t kind)
2158 {
2159         switch(kind) {
2160         case EXPR_BINARY_EQUAL:         return ir_relation_equal;
2161         case EXPR_BINARY_ISLESSGREATER: return ir_relation_less_greater;
2162         case EXPR_BINARY_NOTEQUAL:      return ir_relation_unordered_less_greater;
2163         case EXPR_BINARY_ISLESS:
2164         case EXPR_BINARY_LESS:          return ir_relation_less;
2165         case EXPR_BINARY_ISLESSEQUAL:
2166         case EXPR_BINARY_LESSEQUAL:     return ir_relation_less_equal;
2167         case EXPR_BINARY_ISGREATER:
2168         case EXPR_BINARY_GREATER:       return ir_relation_greater;
2169         case EXPR_BINARY_ISGREATEREQUAL:
2170         case EXPR_BINARY_GREATEREQUAL:  return ir_relation_greater_equal;
2171         case EXPR_BINARY_ISUNORDERED:   return ir_relation_unordered;
2172
2173         default:
2174                 break;
2175         }
2176         panic("trying to get ir_relation from non-comparison binexpr type");
2177 }
2178
2179 /**
2180  * Handle the assume optimizer hint: check if a Confirm
2181  * node can be created.
2182  *
2183  * @param dbi    debug info
2184  * @param expr   the IL assume expression
2185  *
2186  * we support here only some simple cases:
2187  *  - var rel const
2188  *  - const rel val
2189  *  - var rel var
2190  */
2191 static ir_node *handle_assume_compare(dbg_info *dbi,
2192                                       const binary_expression_t *expression)
2193 {
2194         expression_t *op1 = expression->left;
2195         expression_t *op2 = expression->right;
2196         entity_t     *var2, *var = NULL;
2197         ir_node      *res      = NULL;
2198         ir_relation   relation = get_relation(expression->base.kind);
2199
2200         if (is_local_variable(op1) && is_local_variable(op2)) {
2201                 var  = op1->reference.entity;
2202             var2 = op2->reference.entity;
2203
2204                 type_t  *const type = skip_typeref(var->declaration.type);
2205                 ir_mode *const mode = get_ir_mode_storage(type);
2206
2207                 ir_node *const irn1 = get_value(var->variable.v.value_number, mode);
2208                 ir_node *const irn2 = get_value(var2->variable.v.value_number, mode);
2209
2210                 res = new_d_Confirm(dbi, irn2, irn1, get_inversed_relation(relation));
2211                 set_value(var2->variable.v.value_number, res);
2212
2213                 res = new_d_Confirm(dbi, irn1, irn2, relation);
2214                 set_value(var->variable.v.value_number, res);
2215
2216                 return res;
2217         }
2218
2219         expression_t *con = NULL;
2220         if (is_local_variable(op1) && is_constant_expression(op2) == EXPR_CLASS_CONSTANT) {
2221                 var = op1->reference.entity;
2222                 con = op2;
2223         } else if (is_constant_expression(op1) == EXPR_CLASS_CONSTANT && is_local_variable(op2)) {
2224                 relation = get_inversed_relation(relation);
2225                 var = op2->reference.entity;
2226                 con = op1;
2227         }
2228
2229         if (var != NULL) {
2230                 type_t  *const type = skip_typeref(var->declaration.type);
2231                 ir_mode *const mode = get_ir_mode_storage(type);
2232
2233                 res = get_value(var->variable.v.value_number, mode);
2234                 res = new_d_Confirm(dbi, res, expression_to_firm(con), relation);
2235                 set_value(var->variable.v.value_number, res);
2236         }
2237         return res;
2238 }
2239
2240 /**
2241  * Handle the assume optimizer hint.
2242  *
2243  * @param dbi    debug info
2244  * @param expr   the IL assume expression
2245  */
2246 static ir_node *handle_assume(dbg_info *dbi, const expression_t *expression)
2247 {
2248         switch(expression->kind) {
2249         case EXPR_BINARY_EQUAL:
2250         case EXPR_BINARY_NOTEQUAL:
2251         case EXPR_BINARY_LESS:
2252         case EXPR_BINARY_LESSEQUAL:
2253         case EXPR_BINARY_GREATER:
2254         case EXPR_BINARY_GREATEREQUAL:
2255                 return handle_assume_compare(dbi, &expression->binary);
2256         default:
2257                 return NULL;
2258         }
2259 }
2260
2261 static ir_node *create_cast(dbg_info *dbgi, ir_node *value_node,
2262                             type_t *from_type, type_t *type)
2263 {
2264         type = skip_typeref(type);
2265         if (is_type_void(type)) {
2266                 /* make sure firm type is constructed */
2267                 (void) get_ir_type(type);
2268                 return NULL;
2269         }
2270         if (!is_type_scalar(type)) {
2271                 /* make sure firm type is constructed */
2272                 (void) get_ir_type(type);
2273                 return value_node;
2274         }
2275
2276         from_type     = skip_typeref(from_type);
2277         ir_mode *mode = get_ir_mode_storage(type);
2278         /* check for conversion from / to __based types */
2279         if (is_type_pointer(type) && is_type_pointer(from_type)) {
2280                 const variable_t *from_var = from_type->pointer.base_variable;
2281                 const variable_t *to_var   = type->pointer.base_variable;
2282                 if (from_var != to_var) {
2283                         if (from_var != NULL) {
2284                                 ir_node *const addr = create_symconst(dbgi, from_var->v.entity);
2285                                 ir_node *const base = deref_address(dbgi, from_var->base.type, addr);
2286                                 value_node = new_d_Add(dbgi, value_node, base, mode);
2287                         }
2288                         if (to_var != NULL) {
2289                                 ir_node *const addr = create_symconst(dbgi, to_var->v.entity);
2290                                 ir_node *const base = deref_address(dbgi, to_var->base.type, addr);
2291                                 value_node = new_d_Sub(dbgi, value_node, base, mode);
2292                         }
2293                 }
2294         }
2295
2296         if (is_type_atomic(type, ATOMIC_TYPE_BOOL)) {
2297                 /* bool adjustments (we save a mode_Bu, but have to temporarily
2298                  * convert to mode_b so we only get a 0/1 value */
2299                 value_node = create_conv(dbgi, value_node, mode_b);
2300         }
2301
2302         ir_mode *mode_arith = get_ir_mode_arithmetic(type);
2303         ir_node *node       = create_conv(dbgi, value_node, mode);
2304         node                = create_conv(dbgi, node, mode_arith);
2305
2306         return node;
2307 }
2308
2309 static ir_node *unary_expression_to_firm(const unary_expression_t *expression)
2310 {
2311         dbg_info *dbgi = get_dbg_info(&expression->base.pos);
2312         type_t   *type = skip_typeref(expression->base.type);
2313
2314         const expression_t *value = expression->value;
2315
2316         switch(expression->base.kind) {
2317         case EXPR_UNARY_TAKE_ADDRESS:
2318                 return expression_to_addr(value);
2319
2320         case EXPR_UNARY_NEGATE: {
2321                 ir_node *value_node = expression_to_firm(value);
2322                 ir_mode *mode       = get_ir_mode_arithmetic(type);
2323                 return new_d_Minus(dbgi, value_node, mode);
2324         }
2325         case EXPR_UNARY_PLUS:
2326                 return expression_to_firm(value);
2327         case EXPR_UNARY_BITWISE_NEGATE: {
2328                 ir_node *value_node = expression_to_firm(value);
2329                 ir_mode *mode       = get_ir_mode_arithmetic(type);
2330                 return new_d_Not(dbgi, value_node, mode);
2331         }
2332         case EXPR_UNARY_NOT: {
2333                 ir_node *value_node = _expression_to_firm(value);
2334                 value_node          = create_conv(dbgi, value_node, mode_b);
2335                 ir_node *res        = new_d_Not(dbgi, value_node, mode_b);
2336                 return res;
2337         }
2338         case EXPR_UNARY_DEREFERENCE: {
2339                 ir_node *value_node = expression_to_firm(value);
2340                 type_t  *value_type = skip_typeref(value->base.type);
2341                 assert(is_type_pointer(value_type));
2342
2343                 /* check for __based */
2344                 const variable_t *const base_var = value_type->pointer.base_variable;
2345                 if (base_var != NULL) {
2346                         ir_node *const addr = create_symconst(dbgi, base_var->v.entity);
2347                         ir_node *const base = deref_address(dbgi, base_var->base.type, addr);
2348                         value_node = new_d_Add(dbgi, value_node, base, get_ir_mode_storage(value_type));
2349                 }
2350                 type_t  *points_to  = value_type->pointer.points_to;
2351                 return deref_address(dbgi, points_to, value_node);
2352         }
2353         case EXPR_UNARY_POSTFIX_INCREMENT:
2354         case EXPR_UNARY_POSTFIX_DECREMENT:
2355         case EXPR_UNARY_PREFIX_INCREMENT:
2356         case EXPR_UNARY_PREFIX_DECREMENT:
2357                 return create_incdec(expression);
2358         case EXPR_UNARY_CAST: {
2359                 ir_node *value_node = expression_to_firm(value);
2360                 type_t  *from_type  = value->base.type;
2361                 return create_cast(dbgi, value_node, from_type, type);
2362         }
2363         case EXPR_UNARY_ASSUME:
2364                 return handle_assume(dbgi, value);
2365
2366         default:
2367                 break;
2368         }
2369         panic("invalid unary expression type");
2370 }
2371
2372 /**
2373  * produces a 0/1 depending of the value of a mode_b node
2374  */
2375 static ir_node *produce_condition_result(const expression_t *expression,
2376                                          ir_mode *mode, dbg_info *dbgi)
2377 {
2378         jump_target true_target;
2379         jump_target false_target;
2380         init_jump_target(&true_target,  NULL);
2381         init_jump_target(&false_target, NULL);
2382         create_condition_evaluation(expression, &true_target, &false_target);
2383
2384         ir_node    *val = NULL;
2385         jump_target exit_target;
2386         init_jump_target(&exit_target, NULL);
2387
2388         if (enter_jump_target(&true_target)) {
2389                 val = new_Const(get_mode_one(mode));
2390                 jump_to_target(&exit_target);
2391         }
2392
2393         if (enter_jump_target(&false_target)) {
2394                 ir_node *const zero = new_Const(get_mode_null(mode));
2395                 jump_to_target(&exit_target);
2396                 if (val) {
2397                         ir_node *const in[] = { val, zero };
2398                         val = new_rd_Phi(dbgi, exit_target.block, lengthof(in), in, mode);
2399                 } else {
2400                         val = zero;
2401                 }
2402         }
2403
2404         if (!enter_jump_target(&exit_target)) {
2405                 set_cur_block(new_Block(0, NULL));
2406                 val = new_Unknown(mode);
2407         }
2408         return val;
2409 }
2410
2411 static ir_node *adjust_for_pointer_arithmetic(dbg_info *dbgi,
2412                 ir_node *value, type_t *type)
2413 {
2414         ir_mode        *const mode         = get_ir_mode_arithmetic(type_ptrdiff_t);
2415         assert(is_type_pointer(type));
2416         pointer_type_t *const pointer_type = &type->pointer;
2417         type_t         *const points_to    = skip_typeref(pointer_type->points_to);
2418         ir_node        *      elem_size    = get_type_size_node(points_to);
2419         elem_size                          = create_conv(dbgi, elem_size, mode);
2420         value                              = create_conv(dbgi, value,     mode);
2421         ir_node        *const mul          = new_d_Mul(dbgi, value, elem_size, mode);
2422         return mul;
2423 }
2424
2425 static ir_node *create_op(dbg_info *dbgi, const binary_expression_t *expression,
2426                           ir_node *left, ir_node *right)
2427 {
2428         ir_mode  *mode;
2429         type_t   *type_left  = skip_typeref(expression->left->base.type);
2430         type_t   *type_right = skip_typeref(expression->right->base.type);
2431
2432         expression_kind_t kind = expression->base.kind;
2433
2434         switch (kind) {
2435         case EXPR_BINARY_SHIFTLEFT:
2436         case EXPR_BINARY_SHIFTRIGHT:
2437         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2438         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2439                 mode  = get_ir_mode_arithmetic(expression->base.type);
2440                 right = create_conv(dbgi, right, atomic_modes[ATOMIC_TYPE_UINT]);
2441                 break;
2442
2443         case EXPR_BINARY_SUB:
2444                 if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
2445                         const pointer_type_t *const ptr_type = &type_left->pointer;
2446
2447                         mode = get_ir_mode_arithmetic(expression->base.type);
2448                         ir_node *const elem_size = get_type_size_node(ptr_type->points_to);
2449                         ir_node *const conv_size = new_d_Conv(dbgi, elem_size, mode);
2450                         ir_node *const sub       = new_d_Sub(dbgi, left, right, mode);
2451                         ir_node *const no_mem    = new_NoMem();
2452                         ir_node *const div       = new_d_DivRL(dbgi, no_mem, sub, conv_size,
2453                                                                                                    mode, op_pin_state_floats);
2454                         return new_d_Proj(dbgi, div, mode, pn_Div_res);
2455                 }
2456                 /* fallthrough */
2457         case EXPR_BINARY_SUB_ASSIGN:
2458                 if (is_type_pointer(type_left)) {
2459                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2460                         mode  = get_ir_mode_arithmetic(type_left);
2461                         break;
2462                 }
2463                 goto normal_node;
2464
2465         case EXPR_BINARY_ADD:
2466         case EXPR_BINARY_ADD_ASSIGN:
2467                 if (is_type_pointer(type_left)) {
2468                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2469                         mode  = get_ir_mode_arithmetic(type_left);
2470                         break;
2471                 } else if (is_type_pointer(type_right)) {
2472                         left  = adjust_for_pointer_arithmetic(dbgi, left, type_right);
2473                         mode  = get_ir_mode_arithmetic(type_right);
2474                         break;
2475                 }
2476                 goto normal_node;
2477
2478         default:
2479 normal_node:
2480                 mode = get_ir_mode_arithmetic(type_right);
2481                 left = create_conv(dbgi, left, mode);
2482                 break;
2483         }
2484
2485         switch (kind) {
2486         case EXPR_BINARY_ADD_ASSIGN:
2487         case EXPR_BINARY_ADD:
2488                 return new_d_Add(dbgi, left, right, mode);
2489         case EXPR_BINARY_SUB_ASSIGN:
2490         case EXPR_BINARY_SUB:
2491                 return new_d_Sub(dbgi, left, right, mode);
2492         case EXPR_BINARY_MUL_ASSIGN:
2493         case EXPR_BINARY_MUL:
2494                 return new_d_Mul(dbgi, left, right, mode);
2495         case EXPR_BINARY_BITWISE_AND:
2496         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2497                 return new_d_And(dbgi, left, right, mode);
2498         case EXPR_BINARY_BITWISE_OR:
2499         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2500                 return new_d_Or(dbgi, left, right, mode);
2501         case EXPR_BINARY_BITWISE_XOR:
2502         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2503                 return new_d_Eor(dbgi, left, right, mode);
2504         case EXPR_BINARY_SHIFTLEFT:
2505         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2506                 return new_d_Shl(dbgi, left, right, mode);
2507         case EXPR_BINARY_SHIFTRIGHT:
2508         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2509                 if (mode_is_signed(mode)) {
2510                         return new_d_Shrs(dbgi, left, right, mode);
2511                 } else {
2512                         return new_d_Shr(dbgi, left, right, mode);
2513                 }
2514         case EXPR_BINARY_DIV:
2515         case EXPR_BINARY_DIV_ASSIGN: {
2516                 ir_node *pin = new_Pin(new_NoMem());
2517                 ir_node *op  = new_d_Div(dbgi, pin, left, right, mode,
2518                                          op_pin_state_floats);
2519                 ir_node *res = new_d_Proj(dbgi, op, mode, pn_Div_res);
2520                 return res;
2521         }
2522         case EXPR_BINARY_MOD:
2523         case EXPR_BINARY_MOD_ASSIGN: {
2524                 ir_node *pin = new_Pin(new_NoMem());
2525                 ir_node *op  = new_d_Mod(dbgi, pin, left, right, mode,
2526                                          op_pin_state_floats);
2527                 ir_node *res = new_d_Proj(dbgi, op, mode, pn_Mod_res);
2528                 return res;
2529         }
2530         default:
2531                 panic("unexpected expression kind");
2532         }
2533 }
2534
2535 static ir_node *create_lazy_op(const binary_expression_t *expression)
2536 {
2537         dbg_info *dbgi = get_dbg_info(&expression->base.pos);
2538         type_t   *type = skip_typeref(expression->base.type);
2539         ir_mode  *mode = get_ir_mode_arithmetic(type);
2540
2541         if (is_constant_expression(expression->left) == EXPR_CLASS_CONSTANT) {
2542                 bool val = fold_constant_to_bool(expression->left);
2543                 expression_kind_t ekind = expression->base.kind;
2544                 assert(ekind == EXPR_BINARY_LOGICAL_AND || ekind == EXPR_BINARY_LOGICAL_OR);
2545                 if (ekind == EXPR_BINARY_LOGICAL_AND) {
2546                         if (!val) {
2547                                 return new_Const(get_mode_null(mode));
2548                         }
2549                 } else {
2550                         if (val) {
2551                                 return new_Const(get_mode_one(mode));
2552                         }
2553                 }
2554
2555                 if (is_constant_expression(expression->right) == EXPR_CLASS_CONSTANT) {
2556                         bool valr = fold_constant_to_bool(expression->right);
2557                         return create_Const_from_bool(mode, valr);
2558                 }
2559
2560                 return produce_condition_result(expression->right, mode, dbgi);
2561         }
2562
2563         return produce_condition_result((const expression_t*) expression, mode,
2564                                         dbgi);
2565 }
2566
2567 typedef ir_node * (*create_arithmetic_func)(dbg_info *dbgi, ir_node *left,
2568                                             ir_node *right, ir_mode *mode);
2569
2570 static ir_node *create_assign_binop(const binary_expression_t *expression)
2571 {
2572         dbg_info *const     dbgi = get_dbg_info(&expression->base.pos);
2573         const expression_t *left_expr = expression->left;
2574         type_t             *type      = skip_typeref(left_expr->base.type);
2575         ir_node            *right     = expression_to_firm(expression->right);
2576         ir_node            *left_addr = expression_to_addr(left_expr);
2577         ir_node            *left      = get_value_from_lvalue(left_expr, left_addr);
2578         ir_node            *result    = create_op(dbgi, expression, left, right);
2579
2580         result = create_cast(dbgi, result, expression->right->base.type, type);
2581
2582         result = set_value_for_expression_addr(left_expr, result, left_addr);
2583
2584         if (!is_type_compound(type)) {
2585                 ir_mode *mode_arithmetic = get_ir_mode_arithmetic(type);
2586                 result = create_conv(dbgi, result, mode_arithmetic);
2587         }
2588         return result;
2589 }
2590
2591 static ir_node *binary_expression_to_firm(const binary_expression_t *expression)
2592 {
2593         expression_kind_t kind = expression->base.kind;
2594
2595         switch(kind) {
2596         case EXPR_BINARY_EQUAL:
2597         case EXPR_BINARY_NOTEQUAL:
2598         case EXPR_BINARY_LESS:
2599         case EXPR_BINARY_LESSEQUAL:
2600         case EXPR_BINARY_GREATER:
2601         case EXPR_BINARY_GREATEREQUAL:
2602         case EXPR_BINARY_ISGREATER:
2603         case EXPR_BINARY_ISGREATEREQUAL:
2604         case EXPR_BINARY_ISLESS:
2605         case EXPR_BINARY_ISLESSEQUAL:
2606         case EXPR_BINARY_ISLESSGREATER:
2607         case EXPR_BINARY_ISUNORDERED: {
2608                 dbg_info   *dbgi     = get_dbg_info(&expression->base.pos);
2609                 ir_node    *left     = expression_to_firm(expression->left);
2610                 ir_node    *right    = expression_to_firm(expression->right);
2611                 ir_relation relation = get_relation(kind);
2612                 ir_node    *cmp      = new_d_Cmp(dbgi, left, right, relation);
2613                 return cmp;
2614         }
2615         case EXPR_BINARY_ASSIGN: {
2616                 ir_node *addr  = expression_to_addr(expression->left);
2617                 ir_node *right = expression_to_firm(expression->right);
2618                 ir_node *res
2619                         = set_value_for_expression_addr(expression->left, right, addr);
2620
2621                 type_t  *type            = skip_typeref(expression->base.type);
2622                 if (!is_type_compound(type)) {
2623                         ir_mode *mode_arithmetic = get_ir_mode_arithmetic(type);
2624                         res                      = create_conv(NULL, res, mode_arithmetic);
2625                 }
2626                 return res;
2627         }
2628         case EXPR_BINARY_ADD:
2629         case EXPR_BINARY_SUB:
2630         case EXPR_BINARY_MUL:
2631         case EXPR_BINARY_DIV:
2632         case EXPR_BINARY_MOD:
2633         case EXPR_BINARY_BITWISE_AND:
2634         case EXPR_BINARY_BITWISE_OR:
2635         case EXPR_BINARY_BITWISE_XOR:
2636         case EXPR_BINARY_SHIFTLEFT:
2637         case EXPR_BINARY_SHIFTRIGHT:
2638         {
2639                 dbg_info *dbgi  = get_dbg_info(&expression->base.pos);
2640                 ir_node  *left  = expression_to_firm(expression->left);
2641                 ir_node  *right = expression_to_firm(expression->right);
2642                 return create_op(dbgi, expression, left, right);
2643         }
2644         case EXPR_BINARY_LOGICAL_AND:
2645         case EXPR_BINARY_LOGICAL_OR:
2646                 return create_lazy_op(expression);
2647         case EXPR_BINARY_COMMA:
2648                 /* create side effects of left side */
2649                 (void) expression_to_firm(expression->left);
2650                 return _expression_to_firm(expression->right);
2651
2652         case EXPR_BINARY_ADD_ASSIGN:
2653         case EXPR_BINARY_SUB_ASSIGN:
2654         case EXPR_BINARY_MUL_ASSIGN:
2655         case EXPR_BINARY_MOD_ASSIGN:
2656         case EXPR_BINARY_DIV_ASSIGN:
2657         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2658         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2659         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2660         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2661         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2662                 return create_assign_binop(expression);
2663         default:
2664                 panic("invalid binexpr type");
2665         }
2666 }
2667
2668 static ir_node *array_access_addr(const array_access_expression_t *expression)
2669 {
2670         dbg_info *dbgi        = get_dbg_info(&expression->base.pos);
2671         ir_node  *base_addr   = expression_to_firm(expression->array_ref);
2672         ir_node  *offset      = expression_to_firm(expression->index);
2673         type_t   *ref_type    = skip_typeref(expression->array_ref->base.type);
2674         ir_node  *real_offset = adjust_for_pointer_arithmetic(dbgi, offset, ref_type);
2675         ir_node  *result      = new_d_Add(dbgi, base_addr, real_offset, mode_P_data);
2676
2677         return result;
2678 }
2679
2680 static ir_node *array_access_to_firm(
2681                 const array_access_expression_t *expression)
2682 {
2683         dbg_info *dbgi   = get_dbg_info(&expression->base.pos);
2684         ir_node  *addr   = array_access_addr(expression);
2685         type_t   *type   = revert_automatic_type_conversion(
2686                         (const expression_t*) expression);
2687         type             = skip_typeref(type);
2688
2689         return deref_address(dbgi, type, addr);
2690 }
2691
2692 static long get_offsetof_offset(const offsetof_expression_t *expression)
2693 {
2694         type_t *orig_type = expression->type;
2695         long    offset    = 0;
2696
2697         designator_t *designator = expression->designator;
2698         for ( ; designator != NULL; designator = designator->next) {
2699                 type_t *type = skip_typeref(orig_type);
2700                 /* be sure the type is constructed */
2701                 (void) get_ir_type(type);
2702
2703                 if (designator->symbol != NULL) {
2704                         assert(is_type_compound(type));
2705                         symbol_t *symbol = designator->symbol;
2706
2707                         compound_t *compound = type->compound.compound;
2708                         entity_t   *iter     = compound->members.entities;
2709                         for (; iter->base.symbol != symbol; iter = iter->base.next) {}
2710
2711                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
2712                         assert(iter->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
2713                         offset += get_entity_offset(iter->compound_member.entity);
2714
2715                         orig_type = iter->declaration.type;
2716                 } else {
2717                         expression_t *array_index = designator->array_index;
2718                         assert(designator->array_index != NULL);
2719                         assert(is_type_array(type));
2720
2721                         long index         = fold_constant_to_int(array_index);
2722                         ir_type *arr_type  = get_ir_type(type);
2723                         ir_type *elem_type = get_array_element_type(arr_type);
2724                         long     elem_size = get_type_size_bytes(elem_type);
2725
2726                         offset += index * elem_size;
2727
2728                         orig_type = type->array.element_type;
2729                 }
2730         }
2731
2732         return offset;
2733 }
2734
2735 static ir_node *offsetof_to_firm(const offsetof_expression_t *expression)
2736 {
2737         ir_mode   *mode   = get_ir_mode_arithmetic(expression->base.type);
2738         long       offset = get_offsetof_offset(expression);
2739         ir_tarval *tv     = new_tarval_from_long(offset, mode);
2740         dbg_info  *dbgi   = get_dbg_info(&expression->base.pos);
2741
2742         return new_d_Const(dbgi, tv);
2743 }
2744
2745 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
2746                                      ir_entity *entity, type_t *type);
2747 static ir_initializer_t *create_ir_initializer(
2748                 const initializer_t *initializer, type_t *type);
2749
2750 static ir_entity *create_initializer_entity(dbg_info *dbgi,
2751                                             initializer_t *initializer,
2752                                             type_t *type)
2753 {
2754         /* create the ir_initializer */
2755         PUSH_IRG(get_const_code_irg());
2756         ir_initializer_t *irinitializer = create_ir_initializer(initializer, type);
2757         POP_IRG();
2758
2759         ident     *const id          = id_unique("initializer.%u");
2760         ir_type   *const irtype      = get_ir_type(type);
2761         ir_type   *const global_type = get_glob_type();
2762         ir_entity *const entity      = new_d_entity(global_type, id, irtype, dbgi);
2763         set_entity_ld_ident(entity, id);
2764         set_entity_visibility(entity, ir_visibility_private);
2765         add_entity_linkage(entity, IR_LINKAGE_CONSTANT);
2766         set_entity_initializer(entity, irinitializer);
2767         return entity;
2768 }
2769
2770 static ir_node *compound_literal_addr(compound_literal_expression_t const *const expression)
2771 {
2772         dbg_info      *dbgi        = get_dbg_info(&expression->base.pos);
2773         type_t        *type        = expression->type;
2774         initializer_t *initializer = expression->initializer;
2775
2776         if (expression->global_scope ||
2777                 ((type->base.qualifiers & TYPE_QUALIFIER_CONST)
2778             && is_constant_initializer(initializer) == EXPR_CLASS_CONSTANT)) {
2779                 ir_entity *entity = create_initializer_entity(dbgi, initializer, type);
2780                 return create_symconst(dbgi, entity);
2781         } else {
2782                 /* create an entity on the stack */
2783                 ident   *const id     = id_unique("CompLit.%u");
2784                 ir_type *const irtype = get_ir_type(type);
2785                 ir_type *frame_type   = get_irg_frame_type(current_ir_graph);
2786
2787                 ir_entity *const entity = new_d_entity(frame_type, id, irtype, dbgi);
2788                 set_entity_ld_ident(entity, id);
2789
2790                 /* create initialisation code */
2791                 create_local_initializer(initializer, dbgi, entity, type);
2792
2793                 /* create a sel for the compound literal address */
2794                 ir_node *frame = get_irg_frame(current_ir_graph);
2795                 ir_node *sel   = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
2796                 return sel;
2797         }
2798 }
2799
2800 static ir_node *compound_literal_to_firm(compound_literal_expression_t const* const expr)
2801 {
2802         dbg_info *const dbgi = get_dbg_info(&expr->base.pos);
2803         type_t   *const type = expr->type;
2804         ir_node  *const addr = compound_literal_addr(expr);
2805         return deref_address(dbgi, type, addr);
2806 }
2807
2808 /**
2809  * Transform a sizeof expression into Firm code.
2810  */
2811 static ir_node *sizeof_to_firm(const typeprop_expression_t *expression)
2812 {
2813         type_t *const type = skip_typeref(expression->type);
2814         /* §6.5.3.4:2 if the type is a VLA, evaluate the expression. */
2815         if (is_type_array(type) && type->array.is_vla
2816                         && expression->tp_expression != NULL) {
2817                 expression_to_firm(expression->tp_expression);
2818         }
2819
2820         return get_type_size_node(type);
2821 }
2822
2823 static entity_t *get_expression_entity(const expression_t *expression)
2824 {
2825         if (expression->kind != EXPR_REFERENCE)
2826                 return NULL;
2827
2828         return expression->reference.entity;
2829 }
2830
2831 static unsigned get_cparser_entity_alignment(const entity_t *entity)
2832 {
2833         switch(entity->kind) {
2834         case DECLARATION_KIND_CASES:
2835                 return entity->declaration.alignment;
2836         case ENTITY_STRUCT:
2837         case ENTITY_UNION:
2838                 return entity->compound.alignment;
2839         case ENTITY_TYPEDEF:
2840                 return entity->typedefe.alignment;
2841         default:
2842                 break;
2843         }
2844         return 0;
2845 }
2846
2847 /**
2848  * Transform an alignof expression into Firm code.
2849  */
2850 static ir_node *alignof_to_firm(const typeprop_expression_t *expression)
2851 {
2852         unsigned alignment = 0;
2853
2854         const expression_t *tp_expression = expression->tp_expression;
2855         if (tp_expression != NULL) {
2856                 entity_t *entity = get_expression_entity(tp_expression);
2857                 if (entity != NULL) {
2858                         alignment = get_cparser_entity_alignment(entity);
2859                 }
2860         }
2861
2862         if (alignment == 0) {
2863                 type_t *type = expression->type;
2864                 alignment = get_type_alignment(type);
2865         }
2866
2867         dbg_info  *dbgi = get_dbg_info(&expression->base.pos);
2868         ir_mode   *mode = get_ir_mode_arithmetic(expression->base.type);
2869         ir_tarval *tv   = new_tarval_from_long(alignment, mode);
2870         return new_d_Const(dbgi, tv);
2871 }
2872
2873 static void init_ir_types(void);
2874
2875 ir_tarval *fold_constant_to_tarval(const expression_t *expression)
2876 {
2877         assert(is_constant_expression(expression) == EXPR_CLASS_CONSTANT);
2878
2879         bool constant_folding_old = constant_folding;
2880         constant_folding = true;
2881         int old_optimize         = get_optimize();
2882         int old_constant_folding = get_opt_constant_folding();
2883         set_optimize(1);
2884         set_opt_constant_folding(1);
2885
2886         init_ir_types();
2887
2888         PUSH_IRG(get_const_code_irg());
2889         ir_node *const cnst = _expression_to_firm(expression);
2890         POP_IRG();
2891
2892         set_optimize(old_optimize);
2893         set_opt_constant_folding(old_constant_folding);
2894
2895         if (!is_Const(cnst)) {
2896                 panic("couldn't fold constant");
2897         }
2898
2899         constant_folding = constant_folding_old;
2900
2901         ir_tarval *const tv   = get_Const_tarval(cnst);
2902         ir_mode   *const mode = get_ir_mode_arithmetic(skip_typeref(expression->base.type));
2903         return tarval_convert_to(tv, mode);
2904 }
2905
2906 /* this function is only used in parser.c, but it relies on libfirm functionality */
2907 bool constant_is_negative(const expression_t *expression)
2908 {
2909         ir_tarval *tv = fold_constant_to_tarval(expression);
2910         return tarval_is_negative(tv);
2911 }
2912
2913 long fold_constant_to_int(const expression_t *expression)
2914 {
2915         ir_tarval *tv = fold_constant_to_tarval(expression);
2916         if (!tarval_is_long(tv)) {
2917                 panic("result of constant folding is not integer");
2918         }
2919
2920         return get_tarval_long(tv);
2921 }
2922
2923 bool fold_constant_to_bool(const expression_t *expression)
2924 {
2925         ir_tarval *tv = fold_constant_to_tarval(expression);
2926         return !tarval_is_null(tv);
2927 }
2928
2929 static ir_node *conditional_to_firm(const conditional_expression_t *expression)
2930 {
2931         /* first try to fold a constant condition */
2932         if (is_constant_expression(expression->condition) == EXPR_CLASS_CONSTANT) {
2933                 bool val = fold_constant_to_bool(expression->condition);
2934                 if (val) {
2935                         expression_t *true_expression = expression->true_expression;
2936                         if (true_expression == NULL)
2937                                 true_expression = expression->condition;
2938                         return expression_to_firm(true_expression);
2939                 } else {
2940                         return expression_to_firm(expression->false_expression);
2941                 }
2942         }
2943
2944         jump_target true_target;
2945         jump_target false_target;
2946         init_jump_target(&true_target,  NULL);
2947         init_jump_target(&false_target, NULL);
2948         ir_node *const cond_expr = create_condition_evaluation(expression->condition, &true_target, &false_target);
2949
2950         ir_node    *val = NULL;
2951         jump_target exit_target;
2952         init_jump_target(&exit_target, NULL);
2953
2954         if (enter_jump_target(&true_target)) {
2955                 if (expression->true_expression) {
2956                         val = expression_to_firm(expression->true_expression);
2957                 } else if (cond_expr && get_irn_mode(cond_expr) != mode_b) {
2958                         val = cond_expr;
2959                 } else {
2960                         /* Condition ended with a short circuit (&&, ||, !) operation or a
2961                          * comparison.  Generate a "1" as value for the true branch. */
2962                         val = new_Const(get_mode_one(mode_Is));
2963                 }
2964                 jump_to_target(&exit_target);
2965         }
2966
2967         if (enter_jump_target(&false_target)) {
2968                 ir_node *const false_val = expression_to_firm(expression->false_expression);
2969                 jump_to_target(&exit_target);
2970                 if (val) {
2971                         ir_node  *const in[] = { val, false_val };
2972                         dbg_info *const dbgi = get_dbg_info(&expression->base.pos);
2973                         val = new_rd_Phi(dbgi, exit_target.block, lengthof(in), in, get_irn_mode(val));
2974                 } else {
2975                         val = false_val;
2976                 }
2977         }
2978
2979         if (!enter_jump_target(&exit_target)) {
2980                 set_cur_block(new_Block(0, NULL));
2981                 type_t *const type = skip_typeref(expression->base.type);
2982                 if (!is_type_void(type))
2983                         val = new_Unknown(get_ir_mode_arithmetic(type));
2984         }
2985         return val;
2986 }
2987
2988 /**
2989  * Returns an IR-node representing the address of a field.
2990  */
2991 static ir_node *select_addr(const select_expression_t *expression)
2992 {
2993         dbg_info *dbgi = get_dbg_info(&expression->base.pos);
2994
2995         construct_select_compound(expression);
2996
2997         ir_node *compound_addr = expression_to_firm(expression->compound);
2998
2999         entity_t *entry = expression->compound_entry;
3000         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3001         assert(entry->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
3002
3003         if (constant_folding) {
3004                 ir_mode *mode      = get_irn_mode(compound_addr);
3005                 ir_mode *mode_uint = get_reference_mode_unsigned_eq(mode);
3006                 ir_node *ofs       = new_Const_long(mode_uint, entry->compound_member.offset);
3007                 return new_d_Add(dbgi, compound_addr, ofs, mode);
3008         } else {
3009                 ir_entity *irentity = entry->compound_member.entity;
3010                 assert(irentity != NULL);
3011                 return new_d_simpleSel(dbgi, new_NoMem(), compound_addr, irentity);
3012         }
3013 }
3014
3015 static ir_node *select_to_firm(const select_expression_t *expression)
3016 {
3017         dbg_info *dbgi = get_dbg_info(&expression->base.pos);
3018         ir_node  *addr = select_addr(expression);
3019         type_t   *type = revert_automatic_type_conversion(
3020                         (const expression_t*) expression);
3021         type           = skip_typeref(type);
3022
3023         entity_t *entry = expression->compound_entry;
3024         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3025
3026         if (entry->compound_member.bitfield) {
3027                 return bitfield_extract_to_firm(expression, addr);
3028         }
3029
3030         return deref_address(dbgi, type, addr);
3031 }
3032
3033 /* Values returned by __builtin_classify_type. */
3034 typedef enum gcc_type_class
3035 {
3036         no_type_class = -1,
3037         void_type_class,
3038         integer_type_class,
3039         char_type_class,
3040         enumeral_type_class,
3041         boolean_type_class,
3042         pointer_type_class,
3043         reference_type_class,
3044         offset_type_class,
3045         real_type_class,
3046         complex_type_class,
3047         function_type_class,
3048         method_type_class,
3049         record_type_class,
3050         union_type_class,
3051         array_type_class,
3052         string_type_class,
3053         set_type_class,
3054         file_type_class,
3055         lang_type_class
3056 } gcc_type_class;
3057
3058 static ir_node *classify_type_to_firm(const classify_type_expression_t *const expr)
3059 {
3060         type_t *type = expr->type_expression->base.type;
3061
3062         /* FIXME gcc returns different values depending on whether compiling C or C++
3063          * e.g. int x[10] is pointer_type_class in C, but array_type_class in C++ */
3064         gcc_type_class tc;
3065         for (;;) {
3066                 type = skip_typeref(type);
3067                 switch (type->kind) {
3068                         case TYPE_ATOMIC: {
3069                                 const atomic_type_t *const atomic_type = &type->atomic;
3070                                 switch (atomic_type->akind) {
3071                                         /* gcc cannot do that */
3072                                         case ATOMIC_TYPE_VOID:
3073                                                 tc = void_type_class;
3074                                                 goto make_const;
3075
3076                                         case ATOMIC_TYPE_WCHAR_T:   /* gcc handles this as integer */
3077                                         case ATOMIC_TYPE_CHAR:      /* gcc handles this as integer */
3078                                         case ATOMIC_TYPE_SCHAR:     /* gcc handles this as integer */
3079                                         case ATOMIC_TYPE_UCHAR:     /* gcc handles this as integer */
3080                                         case ATOMIC_TYPE_SHORT:
3081                                         case ATOMIC_TYPE_USHORT:
3082                                         case ATOMIC_TYPE_INT:
3083                                         case ATOMIC_TYPE_UINT:
3084                                         case ATOMIC_TYPE_LONG:
3085                                         case ATOMIC_TYPE_ULONG:
3086                                         case ATOMIC_TYPE_LONGLONG:
3087                                         case ATOMIC_TYPE_ULONGLONG:
3088                                         case ATOMIC_TYPE_BOOL:      /* gcc handles this as integer */
3089                                                 tc = integer_type_class;
3090                                                 goto make_const;
3091
3092                                         case ATOMIC_TYPE_FLOAT:
3093                                         case ATOMIC_TYPE_DOUBLE:
3094                                         case ATOMIC_TYPE_LONG_DOUBLE:
3095                                                 tc = real_type_class;
3096                                                 goto make_const;
3097                                 }
3098                                 panic("Unexpected atomic type.");
3099                         }
3100
3101                         case TYPE_COMPLEX:         tc = complex_type_class; goto make_const;
3102                         case TYPE_IMAGINARY:       tc = complex_type_class; goto make_const;
3103                         case TYPE_ARRAY:           /* gcc handles this as pointer */
3104                         case TYPE_FUNCTION:        /* gcc handles this as pointer */
3105                         case TYPE_POINTER:         tc = pointer_type_class; goto make_const;
3106                         case TYPE_COMPOUND_STRUCT: tc = record_type_class;  goto make_const;
3107                         case TYPE_COMPOUND_UNION:  tc = union_type_class;   goto make_const;
3108
3109                         /* gcc handles this as integer */
3110                         case TYPE_ENUM:            tc = integer_type_class; goto make_const;
3111
3112                         /* gcc classifies the referenced type */
3113                         case TYPE_REFERENCE: type = type->reference.refers_to; continue;
3114
3115                         /* typedef/typeof should be skipped already */
3116                         case TYPE_TYPEDEF:
3117                         case TYPE_TYPEOF:
3118                         case TYPE_ERROR:
3119                                 break;
3120                 }
3121                 panic("unexpected type.");
3122         }
3123
3124 make_const:;
3125         dbg_info  *const dbgi = get_dbg_info(&expr->base.pos);
3126         ir_mode   *const mode = atomic_modes[ATOMIC_TYPE_INT];
3127         ir_tarval *const tv   = new_tarval_from_long(tc, mode);
3128         return new_d_Const(dbgi, tv);
3129 }
3130
3131 static ir_node *function_name_to_firm(
3132                 const funcname_expression_t *const expr)
3133 {
3134         switch(expr->kind) {
3135         case FUNCNAME_FUNCTION:
3136         case FUNCNAME_PRETTY_FUNCTION:
3137         case FUNCNAME_FUNCDNAME:
3138                 if (current_function_name == NULL) {
3139                         position_t const *const src_pos = &expr->base.pos;
3140                         char       const *const name    = current_function_entity->base.symbol->string;
3141                         string_t          const string  = { name, strlen(name), STRING_ENCODING_CHAR };
3142                         current_function_name = string_to_firm(src_pos, "__func__.%u", &string);
3143                 }
3144                 return current_function_name;
3145         case FUNCNAME_FUNCSIG:
3146                 if (current_funcsig == NULL) {
3147                         position_t const *const src_pos = &expr->base.pos;
3148                         ir_entity        *const ent     = get_irg_entity(current_ir_graph);
3149                         char       const *const name    = get_entity_ld_name(ent);
3150                         string_t          const string  = { name, strlen(name), STRING_ENCODING_CHAR };
3151                         current_funcsig = string_to_firm(src_pos, "__FUNCSIG__.%u", &string);
3152                 }
3153                 return current_funcsig;
3154         }
3155         panic("Unsupported function name");
3156 }
3157
3158 static ir_node *statement_expression_to_firm(const statement_expression_t *expr)
3159 {
3160         statement_t *statement = expr->statement;
3161
3162         assert(statement->kind == STATEMENT_COMPOUND);
3163         return compound_statement_to_firm(&statement->compound);
3164 }
3165
3166 static ir_node *va_start_expression_to_firm(
3167         const va_start_expression_t *const expr)
3168 {
3169         ir_entity *param_ent = current_vararg_entity;
3170         if (param_ent == NULL) {
3171                 size_t   const n           = IR_VA_START_PARAMETER_NUMBER;
3172                 ir_type *const frame_type  = get_irg_frame_type(current_ir_graph);
3173                 ir_type *const param_type  = get_unknown_type();
3174                 param_ent = new_parameter_entity(frame_type, n, param_type);
3175                 current_vararg_entity = param_ent;
3176         }
3177
3178         ir_node  *const frame   = get_irg_frame(current_ir_graph);
3179         dbg_info *const dbgi    = get_dbg_info(&expr->base.pos);
3180         ir_node  *const no_mem  = new_NoMem();
3181         ir_node  *const arg_sel = new_d_simpleSel(dbgi, no_mem, frame, param_ent);
3182
3183         set_value_for_expression(expr->ap, arg_sel);
3184
3185         return NULL;
3186 }
3187
3188 static ir_node *va_arg_expression_to_firm(const va_arg_expression_t *const expr)
3189 {
3190         type_t       *const type    = expr->base.type;
3191         expression_t *const ap_expr = expr->ap;
3192         ir_node      *const ap_addr = expression_to_addr(ap_expr);
3193         ir_node      *const ap      = get_value_from_lvalue(ap_expr, ap_addr);
3194         dbg_info     *const dbgi    = get_dbg_info(&expr->base.pos);
3195         ir_node      *const res     = deref_address(dbgi, type, ap);
3196
3197         ir_node      *const cnst    = get_type_size_node(expr->base.type);
3198         ir_mode      *const mode    = get_irn_mode(cnst);
3199         ir_node      *const c1      = new_Const_long(mode, stack_param_align - 1);
3200         ir_node      *const c2      = new_d_Add(dbgi, cnst, c1, mode);
3201         ir_node      *const c3      = new_Const_long(mode, -(long)stack_param_align);
3202         ir_node      *const c4      = new_d_And(dbgi, c2, c3, mode);
3203         ir_node      *const add     = new_d_Add(dbgi, ap, c4, mode_P_data);
3204
3205         set_value_for_expression_addr(ap_expr, add, ap_addr);
3206
3207         return res;
3208 }
3209
3210 /**
3211  * Generate Firm for a va_copy expression.
3212  */
3213 static ir_node *va_copy_expression_to_firm(const va_copy_expression_t *const expr)
3214 {
3215         ir_node *const src = expression_to_firm(expr->src);
3216         set_value_for_expression(expr->dst, src);
3217         return NULL;
3218 }
3219
3220 static ir_node *dereference_addr(const unary_expression_t *const expression)
3221 {
3222         assert(expression->base.kind == EXPR_UNARY_DEREFERENCE);
3223         return expression_to_firm(expression->value);
3224 }
3225
3226 /**
3227  * Returns a IR-node representing an lvalue of the given expression.
3228  */
3229 static ir_node *expression_to_addr(const expression_t *expression)
3230 {
3231         switch(expression->kind) {
3232         case EXPR_ARRAY_ACCESS:
3233                 return array_access_addr(&expression->array_access);
3234         case EXPR_CALL:
3235                 return call_expression_to_firm(&expression->call);
3236         case EXPR_COMPOUND_LITERAL:
3237                 return compound_literal_addr(&expression->compound_literal);
3238         case EXPR_REFERENCE:
3239                 return reference_addr(&expression->reference);
3240         case EXPR_SELECT:
3241                 return select_addr(&expression->select);
3242         case EXPR_UNARY_DEREFERENCE:
3243                 return dereference_addr(&expression->unary);
3244         default:
3245                 break;
3246         }
3247         panic("trying to get address of non-lvalue");
3248 }
3249
3250 static ir_node *builtin_constant_to_firm(
3251                 const builtin_constant_expression_t *expression)
3252 {
3253         ir_mode *const mode = get_ir_mode_arithmetic(expression->base.type);
3254         bool     const v    = is_constant_expression(expression->value) == EXPR_CLASS_CONSTANT;
3255         return create_Const_from_bool(mode, v);
3256 }
3257
3258 static ir_node *builtin_types_compatible_to_firm(
3259                 const builtin_types_compatible_expression_t *expression)
3260 {
3261         type_t  *const left  = get_unqualified_type(skip_typeref(expression->left));
3262         type_t  *const right = get_unqualified_type(skip_typeref(expression->right));
3263         bool     const value = types_compatible(left, right);
3264         ir_mode *const mode  = get_ir_mode_arithmetic(expression->base.type);
3265         return create_Const_from_bool(mode, value);
3266 }
3267
3268 static void prepare_label_target(label_t *const label)
3269 {
3270         if (label->address_taken && !label->indirect_block) {
3271                 ir_node *const iblock = new_immBlock();
3272                 label->indirect_block = iblock;
3273                 ARR_APP1(ir_node*, ijmp_blocks, iblock);
3274                 jump_from_block_to_target(&label->target, iblock);
3275         }
3276 }
3277
3278 /**
3279  * Pointer to a label.  This is used for the
3280  * GNU address-of-label extension.
3281  */
3282 static ir_node *label_address_to_firm(const label_address_expression_t *label)
3283 {
3284         /* Beware: Might be called from create initializer with current_ir_graph
3285          * set to const_code_irg. */
3286         PUSH_IRG(current_function);
3287         prepare_label_target(label->label);
3288         POP_IRG();
3289
3290         symconst_symbol value;
3291         value.entity_p = create_Block_entity(label->label->indirect_block);
3292         dbg_info *const dbgi = get_dbg_info(&label->base.pos);
3293         return new_d_SymConst(dbgi, mode_P_code, value, symconst_addr_ent);
3294 }
3295
3296 /**
3297  * creates firm nodes for an expression. The difference between this function
3298  * and expression_to_firm is, that this version might produce mode_b nodes
3299  * instead of mode_Is.
3300  */
3301 static ir_node *_expression_to_firm(expression_t const *const expr)
3302 {
3303 #ifndef NDEBUG
3304         if (!constant_folding) {
3305                 assert(!expr->base.transformed);
3306                 ((expression_t*)expr)->base.transformed = true;
3307         }
3308 #endif
3309
3310         switch (expr->kind) {
3311         case EXPR_ALIGNOF:                    return alignof_to_firm(                 &expr->typeprop);
3312         case EXPR_ARRAY_ACCESS:               return array_access_to_firm(            &expr->array_access);
3313         case EXPR_BINARY_CASES:               return binary_expression_to_firm(       &expr->binary);
3314         case EXPR_BUILTIN_CONSTANT_P:         return builtin_constant_to_firm(        &expr->builtin_constant);
3315         case EXPR_BUILTIN_TYPES_COMPATIBLE_P: return builtin_types_compatible_to_firm(&expr->builtin_types_compatible);
3316         case EXPR_CALL:                       return call_expression_to_firm(         &expr->call);
3317         case EXPR_CLASSIFY_TYPE:              return classify_type_to_firm(           &expr->classify_type);
3318         case EXPR_COMPOUND_LITERAL:           return compound_literal_to_firm(        &expr->compound_literal);
3319         case EXPR_CONDITIONAL:                return conditional_to_firm(             &expr->conditional);
3320         case EXPR_FUNCNAME:                   return function_name_to_firm(           &expr->funcname);
3321         case EXPR_LABEL_ADDRESS:              return label_address_to_firm(           &expr->label_address);
3322         case EXPR_LITERAL_CASES:              return literal_to_firm(                 &expr->literal);
3323         case EXPR_LITERAL_CHARACTER:          return char_literal_to_firm(            &expr->string_literal);
3324         case EXPR_OFFSETOF:                   return offsetof_to_firm(                &expr->offsetofe);
3325         case EXPR_REFERENCE:                  return reference_expression_to_firm(    &expr->reference);
3326         case EXPR_ENUM_CONSTANT:              return enum_constant_to_firm(           &expr->reference);
3327         case EXPR_SELECT:                     return select_to_firm(                  &expr->select);
3328         case EXPR_SIZEOF:                     return sizeof_to_firm(                  &expr->typeprop);
3329         case EXPR_STATEMENT:                  return statement_expression_to_firm(    &expr->statement);
3330         case EXPR_UNARY_CASES:                return unary_expression_to_firm(        &expr->unary);
3331         case EXPR_VA_ARG:                     return va_arg_expression_to_firm(       &expr->va_arge);
3332         case EXPR_VA_COPY:                    return va_copy_expression_to_firm(      &expr->va_copye);
3333         case EXPR_VA_START:                   return va_start_expression_to_firm(     &expr->va_starte);
3334
3335         case EXPR_STRING_LITERAL: return string_to_firm(&expr->base.pos, "str.%u", &expr->string_literal.value);
3336
3337         case EXPR_ERROR: break;
3338         }
3339         panic("invalid expression");
3340 }
3341
3342 /**
3343  * Check if a given expression is a GNU __builtin_expect() call.
3344  */
3345 static bool is_builtin_expect(const expression_t *expression)
3346 {
3347         if (expression->kind != EXPR_CALL)
3348                 return false;
3349
3350         expression_t *function = expression->call.function;
3351         if (function->kind != EXPR_REFERENCE)
3352                 return false;
3353         reference_expression_t *ref = &function->reference;
3354         if (ref->entity->kind         != ENTITY_FUNCTION ||
3355             ref->entity->function.btk != BUILTIN_EXPECT)
3356                 return false;
3357
3358         return true;
3359 }
3360
3361 static bool produces_mode_b(const expression_t *expression)
3362 {
3363         switch (expression->kind) {
3364         case EXPR_BINARY_EQUAL:
3365         case EXPR_BINARY_NOTEQUAL:
3366         case EXPR_BINARY_LESS:
3367         case EXPR_BINARY_LESSEQUAL:
3368         case EXPR_BINARY_GREATER:
3369         case EXPR_BINARY_GREATEREQUAL:
3370         case EXPR_BINARY_ISGREATER:
3371         case EXPR_BINARY_ISGREATEREQUAL:
3372         case EXPR_BINARY_ISLESS:
3373         case EXPR_BINARY_ISLESSEQUAL:
3374         case EXPR_BINARY_ISLESSGREATER:
3375         case EXPR_BINARY_ISUNORDERED:
3376         case EXPR_UNARY_NOT:
3377                 return true;
3378
3379         case EXPR_CALL:
3380                 if (is_builtin_expect(expression)) {
3381                         expression_t *argument = expression->call.arguments->expression;
3382                         return produces_mode_b(argument);
3383                 }
3384                 return false;
3385         case EXPR_BINARY_COMMA:
3386                 return produces_mode_b(expression->binary.right);
3387
3388         default:
3389                 return false;
3390         }
3391 }
3392
3393 static ir_node *expression_to_firm(const expression_t *expression)
3394 {
3395         if (!produces_mode_b(expression)) {
3396                 ir_node *res = _expression_to_firm(expression);
3397                 assert(res == NULL || get_irn_mode(res) != mode_b);
3398                 return res;
3399         }
3400
3401         if (is_constant_expression(expression) == EXPR_CLASS_CONSTANT) {
3402                 return new_Const(fold_constant_to_tarval(expression));
3403         }
3404
3405         /* we have to produce a 0/1 from the mode_b expression */
3406         dbg_info *dbgi = get_dbg_info(&expression->base.pos);
3407         ir_mode  *mode = get_ir_mode_arithmetic(expression->base.type);
3408         return produce_condition_result(expression, mode, dbgi);
3409 }
3410
3411 /**
3412  * create a short-circuit expression evaluation that tries to construct
3413  * efficient control flow structures for &&, || and ! expressions
3414  */
3415 static ir_node *create_condition_evaluation(expression_t const *const expression, jump_target *const true_target, jump_target *const false_target)
3416 {
3417         switch(expression->kind) {
3418         case EXPR_UNARY_NOT: {
3419                 const unary_expression_t *unary_expression = &expression->unary;
3420                 create_condition_evaluation(unary_expression->value, false_target, true_target);
3421                 return NULL;
3422         }
3423         case EXPR_BINARY_LOGICAL_AND: {
3424                 jump_target extra_target;
3425                 init_jump_target(&extra_target, NULL);
3426                 create_condition_evaluation(expression->binary.left, &extra_target, false_target);
3427                 if (enter_jump_target(&extra_target))
3428                         create_condition_evaluation(expression->binary.right, true_target, false_target);
3429                 return NULL;
3430         }
3431         case EXPR_BINARY_LOGICAL_OR: {
3432                 jump_target extra_target;
3433                 init_jump_target(&extra_target, NULL);
3434                 create_condition_evaluation(expression->binary.left, true_target, &extra_target);
3435                 if (enter_jump_target(&extra_target))
3436                         create_condition_evaluation(expression->binary.right, true_target, false_target);
3437                 return NULL;
3438         }
3439         default:
3440                 break;
3441         }
3442
3443         ir_node *cond_expr = _expression_to_firm(expression);
3444         if (is_Const(cond_expr)) {
3445                 if (tarval_is_null(get_Const_tarval(cond_expr))) {
3446                         jump_to_target(false_target);
3447                 } else {
3448                         jump_to_target(true_target);
3449                 }
3450         } else {
3451                 dbg_info *dbgi       = get_dbg_info(&expression->base.pos);
3452                 ir_node  *condition  = create_conv(dbgi, cond_expr, mode_b);
3453                 ir_node  *cond       = new_d_Cond(dbgi, condition);
3454                 ir_node  *true_proj  = new_d_Proj(dbgi, cond, mode_X, pn_Cond_true);
3455                 ir_node  *false_proj = new_d_Proj(dbgi, cond, mode_X, pn_Cond_false);
3456
3457                 /* set branch prediction info based on __builtin_expect */
3458                 if (is_builtin_expect(expression) && is_Cond(cond)) {
3459                         call_argument_t *argument = expression->call.arguments->next;
3460                         if (is_constant_expression(argument->expression) == EXPR_CLASS_CONSTANT) {
3461                                 bool               const cnst = fold_constant_to_bool(argument->expression);
3462                                 cond_jmp_predicate const pred = cnst ? COND_JMP_PRED_TRUE : COND_JMP_PRED_FALSE;
3463                                 set_Cond_jmp_pred(cond, pred);
3464                         }
3465                 }
3466
3467                 add_pred_to_jump_target(true_target,  true_proj);
3468                 add_pred_to_jump_target(false_target, false_proj);
3469         }
3470         set_unreachable_now();
3471         return cond_expr;
3472 }
3473
3474 static void create_variable_entity(entity_t *variable,
3475                                    declaration_kind_t declaration_kind,
3476                                    ir_type *parent_type)
3477 {
3478         assert(variable->kind == ENTITY_VARIABLE);
3479         type_t    *type = skip_typeref(variable->declaration.type);
3480
3481         ident     *const id        = new_id_from_str(variable->base.symbol->string);
3482         ir_type   *const irtype    = get_ir_type(type);
3483         dbg_info  *const dbgi      = get_dbg_info(&variable->base.pos);
3484         ir_entity *const irentity  = new_d_entity(parent_type, id, irtype, dbgi);
3485         unsigned         alignment = variable->declaration.alignment;
3486
3487         set_entity_alignment(irentity, alignment);
3488
3489         handle_decl_modifiers(irentity, variable);
3490
3491         variable->declaration.kind  = (unsigned char) declaration_kind;
3492         variable->variable.v.entity = irentity;
3493         set_entity_ld_ident(irentity, create_ld_ident(variable));
3494
3495         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
3496                 set_entity_volatility(irentity, volatility_is_volatile);
3497         }
3498 }
3499
3500
3501 typedef struct type_path_entry_t type_path_entry_t;
3502 struct type_path_entry_t {
3503         type_t           *type;
3504         ir_initializer_t *initializer;
3505         size_t            index;
3506         entity_t         *compound_entry;
3507 };
3508
3509 typedef struct type_path_t type_path_t;
3510 struct type_path_t {
3511         type_path_entry_t *path;
3512         type_t            *top_type;
3513         bool               invalid;
3514 };
3515
3516 static __attribute__((unused)) void debug_print_type_path(const type_path_t *path)
3517 {
3518         size_t len = ARR_LEN(path->path);
3519
3520         for (size_t i = 0; i < len; ++i) {
3521                 const type_path_entry_t *entry = & path->path[i];
3522
3523                 type_t *type = skip_typeref(entry->type);
3524                 if (is_type_compound(type)) {
3525                         fprintf(stderr, ".%s", entry->compound_entry->base.symbol->string);
3526                 } else if (is_type_array(type)) {
3527                         fprintf(stderr, "[%u]", (unsigned) entry->index);
3528                 } else {
3529                         fprintf(stderr, "-INVALID-");
3530                 }
3531         }
3532         fprintf(stderr, "  (");
3533         print_type(path->top_type);
3534         fprintf(stderr, ")");
3535 }
3536
3537 static type_path_entry_t *get_type_path_top(const type_path_t *path)
3538 {
3539         size_t len = ARR_LEN(path->path);
3540         assert(len > 0);
3541         return & path->path[len-1];
3542 }
3543
3544 static type_path_entry_t *append_to_type_path(type_path_t *path)
3545 {
3546         size_t len = ARR_LEN(path->path);
3547         ARR_RESIZE(type_path_entry_t, path->path, len+1);
3548
3549         type_path_entry_t *result = & path->path[len];
3550         memset(result, 0, sizeof(result[0]));
3551         return result;
3552 }
3553
3554 static size_t get_compound_member_count(const compound_type_t *type)
3555 {
3556         compound_t *compound  = type->compound;
3557         size_t      n_members = 0;
3558         entity_t   *member    = compound->members.entities;
3559         for ( ; member != NULL; member = member->base.next) {
3560                 ++n_members;
3561         }
3562
3563         return n_members;
3564 }
3565
3566 static ir_initializer_t *get_initializer_entry(type_path_t *path)
3567 {
3568         type_t *orig_top_type = path->top_type;
3569         type_t *top_type      = skip_typeref(orig_top_type);
3570
3571         assert(is_type_compound(top_type) || is_type_array(top_type));
3572
3573         if (ARR_LEN(path->path) == 0) {
3574                 return NULL;
3575         } else {
3576                 type_path_entry_t *top         = get_type_path_top(path);
3577                 ir_initializer_t  *initializer = top->initializer;
3578                 return get_initializer_compound_value(initializer, top->index);
3579         }
3580 }
3581
3582 static void descend_into_subtype(type_path_t *path)
3583 {
3584         type_t *orig_top_type = path->top_type;
3585         type_t *top_type      = skip_typeref(orig_top_type);
3586
3587         assert(is_type_compound(top_type) || is_type_array(top_type));
3588
3589         ir_initializer_t *initializer = get_initializer_entry(path);
3590
3591         type_path_entry_t *top = append_to_type_path(path);
3592         top->type              = top_type;
3593
3594         size_t len;
3595
3596         if (is_type_compound(top_type)) {
3597                 compound_t *const compound = top_type->compound.compound;
3598                 entity_t   *const entry    = skip_unnamed_bitfields(compound->members.entities);
3599
3600                 top->compound_entry = entry;
3601                 top->index          = 0;
3602                 len                 = get_compound_member_count(&top_type->compound);
3603                 if (entry != NULL) {
3604                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3605                         path->top_type = entry->declaration.type;
3606                 }
3607         } else {
3608                 assert(is_type_array(top_type));
3609                 assert(top_type->array.size > 0);
3610
3611                 top->index     = 0;
3612                 path->top_type = top_type->array.element_type;
3613                 len            = top_type->array.size;
3614         }
3615         if (initializer == NULL
3616                         || get_initializer_kind(initializer) == IR_INITIALIZER_NULL) {
3617                 initializer = create_initializer_compound(len);
3618                 /* we have to set the entry at the 2nd latest path entry... */
3619                 size_t path_len = ARR_LEN(path->path);
3620                 assert(path_len >= 1);
3621                 if (path_len > 1) {
3622                         type_path_entry_t *entry        = & path->path[path_len-2];
3623                         ir_initializer_t  *tinitializer = entry->initializer;
3624                         set_initializer_compound_value(tinitializer, entry->index,
3625                                                        initializer);
3626                 }
3627         }
3628         top->initializer = initializer;
3629 }
3630
3631 static void ascend_from_subtype(type_path_t *path)
3632 {
3633         type_path_entry_t *top = get_type_path_top(path);
3634
3635         path->top_type = top->type;
3636
3637         size_t len = ARR_LEN(path->path);
3638         ARR_RESIZE(type_path_entry_t, path->path, len-1);
3639 }
3640
3641 static void walk_designator(type_path_t *path, const designator_t *designator)
3642 {
3643         /* designators start at current object type */
3644         ARR_RESIZE(type_path_entry_t, path->path, 1);
3645
3646         for ( ; designator != NULL; designator = designator->next) {
3647                 type_path_entry_t *top         = get_type_path_top(path);
3648                 type_t            *orig_type   = top->type;
3649                 type_t            *type        = skip_typeref(orig_type);
3650
3651                 if (designator->symbol != NULL) {
3652                         assert(is_type_compound(type));
3653                         size_t    index  = 0;
3654                         symbol_t *symbol = designator->symbol;
3655
3656                         compound_t *compound = type->compound.compound;
3657                         entity_t   *iter     = compound->members.entities;
3658                         for (; iter->base.symbol != symbol; iter = iter->base.next, ++index) {}
3659                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
3660
3661                         /* revert previous initialisations of other union elements */
3662                         if (type->kind == TYPE_COMPOUND_UNION) {
3663                                 ir_initializer_t *initializer = top->initializer;
3664                                 if (initializer != NULL
3665                                         && get_initializer_kind(initializer) == IR_INITIALIZER_COMPOUND) {
3666                                         /* are we writing to a new element? */
3667                                         ir_initializer_t *oldi
3668                                                 = get_initializer_compound_value(initializer, index);
3669                                         if (get_initializer_kind(oldi) == IR_INITIALIZER_NULL) {
3670                                                 /* clear initializer */
3671                                                 size_t len
3672                                                         = get_initializer_compound_n_entries(initializer);
3673                                                 ir_initializer_t *nulli = get_initializer_null();
3674                                                 for (size_t i = 0; i < len; ++i) {
3675                                                         set_initializer_compound_value(initializer, i,
3676                                                                                        nulli);
3677                                                 }
3678                                         }
3679                                 }
3680                         }
3681
3682                         top->type           = orig_type;
3683                         top->compound_entry = iter;
3684                         top->index          = index;
3685                         orig_type           = iter->declaration.type;
3686                 } else {
3687                         expression_t *array_index = designator->array_index;
3688                         assert(is_type_array(type));
3689
3690                         long index = fold_constant_to_int(array_index);
3691                         assert(0 <= index && (!type->array.size_constant || (size_t)index < type->array.size));
3692
3693                         top->type  = orig_type;
3694                         top->index = (size_t) index;
3695                         orig_type  = type->array.element_type;
3696                 }
3697                 path->top_type = orig_type;
3698
3699                 if (designator->next != NULL) {
3700                         descend_into_subtype(path);
3701                 }
3702         }
3703
3704         path->invalid  = false;
3705 }
3706
3707 static void advance_current_object(type_path_t *path)
3708 {
3709         if (path->invalid) {
3710                 /* TODO: handle this... */
3711                 panic("invalid initializer (excessive elements)");
3712         }
3713
3714         type_path_entry_t *top = get_type_path_top(path);
3715
3716         type_t *type = skip_typeref(top->type);
3717         if (is_type_union(type)) {
3718                 /* only the first element is initialized in unions */
3719                 top->compound_entry = NULL;
3720         } else if (is_type_struct(type)) {
3721                 entity_t *entry = top->compound_entry;
3722
3723                 top->index++;
3724                 entry               = skip_unnamed_bitfields(entry->base.next);
3725                 top->compound_entry = entry;
3726                 if (entry != NULL) {
3727                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3728                         path->top_type = entry->declaration.type;
3729                         return;
3730                 }
3731         } else {
3732                 assert(is_type_array(type));
3733
3734                 top->index++;
3735                 if (!type->array.size_constant || top->index < type->array.size) {
3736                         return;
3737                 }
3738         }
3739
3740         /* we're past the last member of the current sub-aggregate, try if we
3741          * can ascend in the type hierarchy and continue with another subobject */
3742         size_t len = ARR_LEN(path->path);
3743
3744         if (len > 1) {
3745                 ascend_from_subtype(path);
3746                 advance_current_object(path);
3747         } else {
3748                 path->invalid = true;
3749         }
3750 }
3751
3752
3753 static ir_initializer_t *create_ir_initializer_value(
3754                 const initializer_value_t *initializer)
3755 {
3756         expression_t *expr = initializer->value;
3757         type_t       *type = skip_typeref(expr->base.type);
3758
3759         if (is_type_compound(type)) {
3760                 if (expr->kind == EXPR_UNARY_CAST) {
3761                         expr = expr->unary.value;
3762                         type = skip_typeref(expr->base.type);
3763                 }
3764                 /* must be a compound literal... */
3765                 if (expr->kind == EXPR_COMPOUND_LITERAL) {
3766                         return create_ir_initializer(expr->compound_literal.initializer,
3767                                                      type);
3768                 }
3769         }
3770
3771         ir_node *value = expression_to_firm(expr);
3772         if (!is_type_compound(type)) {
3773                 ir_mode *mode = get_ir_mode_storage(type);
3774                 value         = create_conv(NULL, value, mode);
3775         }
3776         return create_initializer_const(value);
3777 }
3778
3779 /** Tests whether type can be initialized by a string constant */
3780 static bool is_string_type(type_t *type)
3781 {
3782         if (!is_type_array(type))
3783                 return false;
3784
3785         type_t *const inner = skip_typeref(type->array.element_type);
3786         return is_type_integer(inner);
3787 }
3788
3789 static ir_initializer_t *create_ir_initializer_list(
3790                 const initializer_list_t *initializer, type_t *type)
3791 {
3792         type_path_t path;
3793         memset(&path, 0, sizeof(path));
3794         path.top_type = type;
3795         path.path     = NEW_ARR_F(type_path_entry_t, 0);
3796
3797         descend_into_subtype(&path);
3798
3799         for (size_t i = 0; i < initializer->len; ++i) {
3800                 const initializer_t *sub_initializer = initializer->initializers[i];
3801
3802                 if (sub_initializer->kind == INITIALIZER_DESIGNATOR) {
3803                         walk_designator(&path, sub_initializer->designator.designator);
3804                         continue;
3805                 }
3806
3807                 if (sub_initializer->kind == INITIALIZER_VALUE) {
3808                         const expression_t *expr      = sub_initializer->value.value;
3809                         const type_t       *expr_type = skip_typeref(expr->base.type);
3810                         /* we might have to descend into types until the types match */
3811                         while(true) {
3812                                 type_t *orig_top_type = path.top_type;
3813                                 type_t *top_type      = skip_typeref(orig_top_type);
3814
3815                                 if (types_compatible(top_type, expr_type))
3816                                         break;
3817                                 descend_into_subtype(&path);
3818                         }
3819                 } else if (sub_initializer->kind == INITIALIZER_STRING) {
3820                         /* we might have to descend into types until we're at a scalar
3821                          * type */
3822                         while (true) {
3823                                 type_t *orig_top_type = path.top_type;
3824                                 type_t *top_type      = skip_typeref(orig_top_type);
3825
3826                                 if (is_string_type(top_type))
3827                                         break;
3828                                 descend_into_subtype(&path);
3829                         }
3830                 }
3831
3832                 ir_initializer_t *sub_irinitializer
3833                         = create_ir_initializer(sub_initializer, path.top_type);
3834
3835                 size_t path_len = ARR_LEN(path.path);
3836                 assert(path_len >= 1);
3837                 type_path_entry_t *entry        = & path.path[path_len-1];
3838                 ir_initializer_t  *tinitializer = entry->initializer;
3839                 set_initializer_compound_value(tinitializer, entry->index,
3840                                                sub_irinitializer);
3841
3842                 advance_current_object(&path);
3843         }
3844
3845         assert(ARR_LEN(path.path) >= 1);
3846         ir_initializer_t *result = path.path[0].initializer;
3847         DEL_ARR_F(path.path);
3848
3849         return result;
3850 }
3851
3852 static ir_initializer_t *create_ir_initializer_string(initializer_t const *const init, type_t *type)
3853 {
3854         type = skip_typeref(type);
3855
3856         assert(type->kind == TYPE_ARRAY);
3857         assert(type->array.size_constant);
3858         string_literal_expression_t const *const str = get_init_string(init);
3859         size_t            const str_len = str->value.size;
3860         size_t            const arr_len = type->array.size;
3861         ir_initializer_t *const irinit  = create_initializer_compound(arr_len);
3862         ir_mode          *const mode    = get_ir_mode_storage(type->array.element_type);
3863         char const       *      p       = str->value.begin;
3864         switch (str->value.encoding) {
3865         case STRING_ENCODING_CHAR:
3866         case STRING_ENCODING_UTF8:
3867                 for (size_t i = 0; i != arr_len; ++i) {
3868                         char              const c      = i < str_len ? *p++ : 0;
3869                         ir_tarval        *const tv     = new_tarval_from_long(c, mode);
3870                         ir_initializer_t *const tvinit = create_initializer_tarval(tv);
3871                         set_initializer_compound_value(irinit, i, tvinit);
3872                 }
3873                 break;
3874
3875         case STRING_ENCODING_CHAR16:
3876         case STRING_ENCODING_CHAR32:
3877         case STRING_ENCODING_WIDE:
3878                 for (size_t i = 0; i != arr_len; ++i) {
3879                         utf32             const c      = i < str_len ? read_utf8_char(&p) : 0;
3880                         ir_tarval        *const tv     = new_tarval_from_long(c, mode);
3881                         ir_initializer_t *const tvinit = create_initializer_tarval(tv);
3882                         set_initializer_compound_value(irinit, i, tvinit);
3883                 }
3884                 break;
3885         }
3886
3887         return irinit;
3888 }
3889
3890 static ir_initializer_t *create_ir_initializer(
3891                 const initializer_t *initializer, type_t *type)
3892 {
3893         switch(initializer->kind) {
3894                 case INITIALIZER_STRING:
3895                         return create_ir_initializer_string(initializer, type);
3896
3897                 case INITIALIZER_LIST:
3898                         return create_ir_initializer_list(&initializer->list, type);
3899
3900                 case INITIALIZER_VALUE:
3901                         return create_ir_initializer_value(&initializer->value);
3902
3903                 case INITIALIZER_DESIGNATOR:
3904                         panic("unexpected designator initializer");
3905         }
3906         panic("unknown initializer");
3907 }
3908
3909 /** ANSI C §6.7.8:21: If there are fewer initializers [..] than there
3910  *  are elements [...] the remainder of the aggregate shall be initialized
3911  *  implicitly the same as objects that have static storage duration. */
3912 static void create_dynamic_null_initializer(ir_entity *entity, dbg_info *dbgi,
3913                 ir_node *base_addr)
3914 {
3915         /* for unions we must NOT do anything for null initializers */
3916         ir_type *owner = get_entity_owner(entity);
3917         if (is_Union_type(owner)) {
3918                 return;
3919         }
3920
3921         ir_type *ent_type = get_entity_type(entity);
3922         /* create sub-initializers for a compound type */
3923         if (is_compound_type(ent_type)) {
3924                 unsigned n_members = get_compound_n_members(ent_type);
3925                 for (unsigned n = 0; n < n_members; ++n) {
3926                         ir_entity *member = get_compound_member(ent_type, n);
3927                         ir_node   *addr   = new_d_simpleSel(dbgi, new_NoMem(), base_addr,
3928                                                                 member);
3929                         create_dynamic_null_initializer(member, dbgi, addr);
3930                 }
3931                 return;
3932         }
3933         if (is_Array_type(ent_type)) {
3934                 assert(has_array_upper_bound(ent_type, 0));
3935                 long n = get_array_upper_bound_int(ent_type, 0);
3936                 for (long i = 0; i < n; ++i) {
3937                         ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
3938                         ir_tarval *index_tv = new_tarval_from_long(i, mode_uint);
3939                         ir_node   *cnst     = new_d_Const(dbgi, index_tv);
3940                         ir_node   *in[1]    = { cnst };
3941                         ir_entity *arrent   = get_array_element_entity(ent_type);
3942                         ir_node   *addr     = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in,
3943                                                         arrent);
3944                         create_dynamic_null_initializer(arrent, dbgi, addr);
3945                 }
3946                 return;
3947         }
3948
3949         ir_mode *value_mode = get_type_mode(ent_type);
3950         ir_node *node       = new_Const(get_mode_null(value_mode));
3951
3952         /* is it a bitfield type? */
3953         if (is_Primitive_type(ent_type) &&
3954                         get_primitive_base_type(ent_type) != NULL) {
3955                 bitfield_store_to_firm(dbgi, entity, base_addr, node, false, false);
3956                 return;
3957         }
3958
3959         ir_node *mem    = get_store();
3960         ir_node *store  = new_d_Store(dbgi, mem, base_addr, node, cons_none);
3961         ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
3962         set_store(proj_m);
3963 }
3964
3965 static void create_dynamic_initializer_sub(ir_initializer_t *initializer,
3966                 ir_entity *entity, ir_type *type, dbg_info *dbgi, ir_node *base_addr)
3967 {
3968         switch(get_initializer_kind(initializer)) {
3969         case IR_INITIALIZER_NULL:
3970                 create_dynamic_null_initializer(entity, dbgi, base_addr);
3971                 return;
3972         case IR_INITIALIZER_CONST: {
3973                 ir_node *node     = get_initializer_const_value(initializer);
3974                 ir_type *ent_type = get_entity_type(entity);
3975
3976                 /* is it a bitfield type? */
3977                 if (is_Primitive_type(ent_type) &&
3978                                 get_primitive_base_type(ent_type) != NULL) {
3979                         bitfield_store_to_firm(dbgi, entity, base_addr, node, false, false);
3980                         return;
3981                 }
3982
3983                 ir_node *mem = get_store();
3984                 ir_node *new_mem;
3985                 if (is_compound_type(ent_type)) {
3986                         ir_node *copyb = new_d_CopyB(dbgi, mem, base_addr, node, ent_type);
3987                         new_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
3988                 } else {
3989                         assert(get_type_mode(type) == get_irn_mode(node));
3990                         ir_node *store = new_d_Store(dbgi, mem, base_addr, node, cons_none);
3991                         new_mem = new_Proj(store, mode_M, pn_Store_M);
3992                 }
3993                 set_store(new_mem);
3994                 return;
3995         }
3996         case IR_INITIALIZER_TARVAL: {
3997                 ir_tarval *tv       = get_initializer_tarval_value(initializer);
3998                 ir_node   *cnst     = new_d_Const(dbgi, tv);
3999                 ir_type   *ent_type = get_entity_type(entity);
4000
4001                 /* is it a bitfield type? */
4002                 if (is_Primitive_type(ent_type) &&
4003                                 get_primitive_base_type(ent_type) != NULL) {
4004                         bitfield_store_to_firm(dbgi, entity, base_addr, cnst, false, false);
4005                         return;
4006                 }
4007
4008                 assert(get_type_mode(type) == get_tarval_mode(tv));
4009                 ir_node *mem    = get_store();
4010                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, cnst, cons_none);
4011                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4012                 set_store(proj_m);
4013                 return;
4014         }
4015         case IR_INITIALIZER_COMPOUND: {
4016                 assert(is_compound_type(type) || is_Array_type(type));
4017                 int n_members;
4018                 if (is_Array_type(type)) {
4019                         assert(has_array_upper_bound(type, 0));
4020                         n_members = get_array_upper_bound_int(type, 0);
4021                 } else {
4022                         n_members = get_compound_n_members(type);
4023                 }
4024
4025                 if (get_initializer_compound_n_entries(initializer)
4026                                 != (unsigned) n_members)
4027                         panic("initializer doesn't match compound type");
4028
4029                 for (int i = 0; i < n_members; ++i) {
4030                         ir_node   *addr;
4031                         ir_type   *irtype;
4032                         ir_entity *sub_entity;
4033                         if (is_Array_type(type)) {
4034                                 ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
4035                                 ir_tarval *index_tv = new_tarval_from_long(i, mode_uint);
4036                                 ir_node   *cnst     = new_d_Const(dbgi, index_tv);
4037                                 ir_node   *in[1]    = { cnst };
4038                                 irtype     = get_array_element_type(type);
4039                                 sub_entity = get_array_element_entity(type);
4040                                 addr       = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in,
4041                                                        sub_entity);
4042                         } else {
4043                                 sub_entity = get_compound_member(type, i);
4044                                 irtype     = get_entity_type(sub_entity);
4045                                 addr       = new_d_simpleSel(dbgi, new_NoMem(), base_addr,
4046                                                              sub_entity);
4047                         }
4048
4049                         ir_initializer_t *sub_init
4050                                 = get_initializer_compound_value(initializer, i);
4051
4052                         create_dynamic_initializer_sub(sub_init, sub_entity, irtype, dbgi,
4053                                                        addr);
4054                 }
4055                 return;
4056         }
4057         }
4058
4059         panic("invalid ir_initializer");
4060 }
4061
4062 static void create_dynamic_initializer(ir_initializer_t *initializer,
4063                 dbg_info *dbgi, ir_entity *entity)
4064 {
4065         ir_node *frame     = get_irg_frame(current_ir_graph);
4066         ir_node *base_addr = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
4067         ir_type *type      = get_entity_type(entity);
4068
4069         create_dynamic_initializer_sub(initializer, entity, type, dbgi, base_addr);
4070 }
4071
4072 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
4073                                      ir_entity *entity, type_t *type)
4074 {
4075         ir_node *memory = get_store();
4076         ir_node *nomem  = new_NoMem();
4077         ir_node *frame  = get_irg_frame(current_ir_graph);
4078         ir_node *addr   = new_d_simpleSel(dbgi, nomem, frame, entity);
4079
4080         if (initializer->kind == INITIALIZER_VALUE) {
4081                 initializer_value_t *initializer_value = &initializer->value;
4082
4083                 ir_node *value = expression_to_firm(initializer_value->value);
4084                 type = skip_typeref(type);
4085                 assign_value(dbgi, addr, type, value);
4086                 return;
4087         }
4088
4089         if (is_constant_initializer(initializer) == EXPR_CLASS_VARIABLE) {
4090                 ir_initializer_t *irinitializer
4091                         = create_ir_initializer(initializer, type);
4092
4093                 create_dynamic_initializer(irinitializer, dbgi, entity);
4094                 return;
4095         }
4096
4097         /* create a "template" entity which is copied to the entity on the stack */
4098         ir_entity *const init_entity
4099                 = create_initializer_entity(dbgi, initializer, type);
4100         ir_node *const src_addr = create_symconst(dbgi, init_entity);
4101         ir_type *const irtype   = get_ir_type(type);
4102         ir_node *const copyb    = new_d_CopyB(dbgi, memory, addr, src_addr, irtype);
4103
4104         ir_node *const copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
4105         set_store(copyb_mem);
4106 }
4107
4108 static void create_initializer_local_variable_entity(entity_t *entity)
4109 {
4110         assert(entity->kind == ENTITY_VARIABLE);
4111         initializer_t *initializer = entity->variable.initializer;
4112         dbg_info      *dbgi        = get_dbg_info(&entity->base.pos);
4113         ir_entity     *irentity    = entity->variable.v.entity;
4114         type_t        *type        = entity->declaration.type;
4115
4116         create_local_initializer(initializer, dbgi, irentity, type);
4117 }
4118
4119 static void create_variable_initializer(entity_t *entity)
4120 {
4121         assert(entity->kind == ENTITY_VARIABLE);
4122         initializer_t *initializer = entity->variable.initializer;
4123         if (initializer == NULL)
4124                 return;
4125
4126         declaration_kind_t declaration_kind
4127                 = (declaration_kind_t) entity->declaration.kind;
4128         if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY) {
4129                 create_initializer_local_variable_entity(entity);
4130                 return;
4131         }
4132
4133         type_t            *type = entity->declaration.type;
4134         type_qualifiers_t  tq   = get_type_qualifier(type, true);
4135
4136         if (initializer->kind == INITIALIZER_VALUE) {
4137                 expression_t *      value     = initializer->value.value;
4138                 type_t       *const init_type = skip_typeref(value->base.type);
4139
4140                 if (!is_type_scalar(init_type)) {
4141                         /* skip convs */
4142                         while (value->kind == EXPR_UNARY_CAST)
4143                                 value = value->unary.value;
4144
4145                         if (value->kind != EXPR_COMPOUND_LITERAL)
4146                                 panic("expected non-scalar initializer to be a compound literal");
4147                         initializer = value->compound_literal.initializer;
4148                         goto have_initializer;
4149                 }
4150
4151                 ir_node  *      node = expression_to_firm(value);
4152                 dbg_info *const dbgi = get_dbg_info(&entity->base.pos);
4153                 ir_mode  *const mode = get_ir_mode_storage(init_type);
4154                 node = create_conv(dbgi, node, mode);
4155
4156                 if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE) {
4157                         set_value(entity->variable.v.value_number, node);
4158                 } else {
4159                         assert(declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4160
4161                         ir_entity *irentity = entity->variable.v.entity;
4162
4163                         if (tq & TYPE_QUALIFIER_CONST
4164                                         && get_entity_owner(irentity) != get_tls_type()) {
4165                                 add_entity_linkage(irentity, IR_LINKAGE_CONSTANT);
4166                         }
4167                         set_atomic_ent_value(irentity, node);
4168                 }
4169         } else {
4170 have_initializer:
4171                 assert(declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY ||
4172                        declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4173
4174                 ir_entity        *irentity        = entity->variable.v.entity;
4175                 ir_initializer_t *irinitializer
4176                         = create_ir_initializer(initializer, type);
4177
4178                 if (tq & TYPE_QUALIFIER_CONST) {
4179                         add_entity_linkage(irentity, IR_LINKAGE_CONSTANT);
4180                 }
4181                 set_entity_initializer(irentity, irinitializer);
4182         }
4183 }
4184
4185 static void create_variable_length_array(entity_t *entity)
4186 {
4187         assert(entity->kind == ENTITY_VARIABLE);
4188         assert(entity->variable.initializer == NULL);
4189
4190         entity->declaration.kind    = DECLARATION_KIND_VARIABLE_LENGTH_ARRAY;
4191         entity->variable.v.vla_base = NULL;
4192
4193         /* TODO: record VLA somewhere so we create the free node when we leave
4194          * it's scope */
4195 }
4196
4197 static void allocate_variable_length_array(entity_t *entity)
4198 {
4199         assert(entity->kind == ENTITY_VARIABLE);
4200         assert(entity->variable.initializer == NULL);
4201         assert(currently_reachable());
4202
4203         dbg_info *dbgi      = get_dbg_info(&entity->base.pos);
4204         type_t   *type      = entity->declaration.type;
4205         ir_type  *el_type   = get_ir_type(type->array.element_type);
4206
4207         /* make sure size_node is calculated */
4208         get_type_size_node(type);
4209         ir_node  *elems = type->array.size_node;
4210         ir_node  *mem   = get_store();
4211         ir_node  *alloc = new_d_Alloc(dbgi, mem, elems, el_type, stack_alloc);
4212
4213         ir_node  *proj_m = new_d_Proj(dbgi, alloc, mode_M, pn_Alloc_M);
4214         ir_node  *addr   = new_d_Proj(dbgi, alloc, mode_P_data, pn_Alloc_res);
4215         set_store(proj_m);
4216
4217         assert(entity->declaration.kind == DECLARATION_KIND_VARIABLE_LENGTH_ARRAY);
4218         entity->variable.v.vla_base = addr;
4219 }
4220
4221 static bool var_needs_entity(variable_t const *const var)
4222 {
4223         if (var->address_taken)
4224                 return true;
4225         type_t *const type = skip_typeref(var->base.type);
4226         return !is_type_scalar(type) || type->base.qualifiers & TYPE_QUALIFIER_VOLATILE;
4227 }
4228
4229 /**
4230  * Creates a Firm local variable from a declaration.
4231  */
4232 static void create_local_variable(entity_t *entity)
4233 {
4234         assert(entity->kind == ENTITY_VARIABLE);
4235         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4236
4237         if (!var_needs_entity(&entity->variable)) {
4238                 entity->declaration.kind        = DECLARATION_KIND_LOCAL_VARIABLE;
4239                 entity->variable.v.value_number = next_value_number_function;
4240                 set_irg_loc_description(current_ir_graph, next_value_number_function, entity);
4241                 ++next_value_number_function;
4242                 return;
4243         }
4244
4245         /* is it a variable length array? */
4246         type_t *const type = skip_typeref(entity->declaration.type);
4247         if (is_type_array(type) && !type->array.size_constant) {
4248                 create_variable_length_array(entity);
4249                 return;
4250         }
4251
4252         ir_type *const frame_type = get_irg_frame_type(current_ir_graph);
4253         create_variable_entity(entity, DECLARATION_KIND_LOCAL_VARIABLE_ENTITY, frame_type);
4254 }
4255
4256 static void create_local_static_variable(entity_t *entity)
4257 {
4258         assert(entity->kind == ENTITY_VARIABLE);
4259         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4260
4261         type_t   *type           = skip_typeref(entity->declaration.type);
4262         ir_type  *const var_type = entity->variable.thread_local ?
4263                 get_tls_type() : get_glob_type();
4264         ir_type  *const irtype   = get_ir_type(type);
4265         dbg_info *const dbgi     = get_dbg_info(&entity->base.pos);
4266
4267         size_t l = strlen(entity->base.symbol->string);
4268         char   buf[l + sizeof(".%u")];
4269         snprintf(buf, sizeof(buf), "%s.%%u", entity->base.symbol->string);
4270         ident     *const id       = id_unique(buf);
4271         ir_entity *const irentity = new_d_entity(var_type, id, irtype, dbgi);
4272
4273         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
4274                 set_entity_volatility(irentity, volatility_is_volatile);
4275         }
4276
4277         entity->declaration.kind  = DECLARATION_KIND_GLOBAL_VARIABLE;
4278         entity->variable.v.entity = irentity;
4279
4280         set_entity_ld_ident(irentity, id);
4281         set_entity_visibility(irentity, ir_visibility_local);
4282
4283         if (entity->variable.initializer == NULL) {
4284                 ir_initializer_t *null_init = get_initializer_null();
4285                 set_entity_initializer(irentity, null_init);
4286         }
4287
4288         PUSH_IRG(get_const_code_irg());
4289         create_variable_initializer(entity);
4290         POP_IRG();
4291 }
4292
4293
4294
4295 static ir_node *return_statement_to_firm(return_statement_t *statement)
4296 {
4297         if (!currently_reachable())
4298                 return NULL;
4299
4300         dbg_info *const dbgi = get_dbg_info(&statement->base.pos);
4301         type_t   *const type = skip_typeref(current_function_entity->declaration.type->function.return_type);
4302         ir_node  *      res  = statement->value ? expression_to_firm(statement->value) : NULL;
4303
4304         int in_len;
4305         if (!is_type_void(type)) {
4306                 ir_mode *const mode = get_ir_mode_storage(type);
4307                 if (res) {
4308                         res = create_conv(dbgi, res, mode);
4309                 } else {
4310                         res = new_Unknown(mode);
4311                 }
4312                 in_len = 1;
4313         } else {
4314                 in_len = 0;
4315         }
4316
4317         ir_node *const in[1] = { res };
4318         ir_node *const store = get_store();
4319         ir_node *const ret   = new_d_Return(dbgi, store, in_len, in);
4320
4321         ir_node *end_block = get_irg_end_block(current_ir_graph);
4322         add_immBlock_pred(end_block, ret);
4323
4324         set_unreachable_now();
4325         return NULL;
4326 }
4327
4328 static ir_node *expression_statement_to_firm(expression_statement_t *statement)
4329 {
4330         if (!currently_reachable())
4331                 return NULL;
4332
4333         return expression_to_firm(statement->expression);
4334 }
4335
4336 static void create_local_declarations(entity_t*);
4337
4338 static ir_node *compound_statement_to_firm(compound_statement_t *compound)
4339 {
4340         create_local_declarations(compound->scope.entities);
4341
4342         ir_node     *result    = NULL;
4343         statement_t *statement = compound->statements;
4344         for ( ; statement != NULL; statement = statement->base.next) {
4345                 result = statement_to_firm(statement);
4346         }
4347
4348         return result;
4349 }
4350
4351 static void create_global_variable(entity_t *entity)
4352 {
4353         ir_linkage          linkage    = IR_LINKAGE_DEFAULT;
4354         ir_visibility       visibility = ir_visibility_external;
4355         storage_class_tag_t storage
4356                 = (storage_class_tag_t)entity->declaration.storage_class;
4357         decl_modifiers_t    modifiers  = entity->declaration.modifiers;
4358         assert(entity->kind == ENTITY_VARIABLE);
4359
4360         switch (storage) {
4361         case STORAGE_CLASS_EXTERN: visibility = ir_visibility_external; break;
4362         case STORAGE_CLASS_STATIC: visibility = ir_visibility_local;    break;
4363         case STORAGE_CLASS_NONE:   visibility = ir_visibility_external; break;
4364         case STORAGE_CLASS_TYPEDEF:
4365         case STORAGE_CLASS_AUTO:
4366         case STORAGE_CLASS_REGISTER:
4367                 panic("invalid storage class for global var");
4368         }
4369
4370         /* "common" symbols */
4371         if (storage == STORAGE_CLASS_NONE
4372             && entity->variable.initializer == NULL
4373             && !entity->variable.thread_local
4374             && (modifiers & DM_WEAK) == 0) {
4375                 linkage |= IR_LINKAGE_MERGE;
4376         }
4377
4378         ir_type *var_type = get_glob_type();
4379         if (entity->variable.thread_local) {
4380                 var_type = get_tls_type();
4381         }
4382         create_variable_entity(entity, DECLARATION_KIND_GLOBAL_VARIABLE, var_type);
4383         ir_entity *irentity = entity->variable.v.entity;
4384         add_entity_linkage(irentity, linkage);
4385         set_entity_visibility(irentity, visibility);
4386         if (entity->variable.initializer == NULL
4387             && storage != STORAGE_CLASS_EXTERN) {
4388                 ir_initializer_t *null_init = get_initializer_null();
4389                 set_entity_initializer(irentity, null_init);
4390         }
4391 }
4392
4393 static void create_local_declaration(entity_t *entity)
4394 {
4395         assert(is_declaration(entity));
4396
4397         /* construct type */
4398         (void) get_ir_type(entity->declaration.type);
4399         if (entity->base.symbol == NULL) {
4400                 return;
4401         }
4402
4403         switch ((storage_class_tag_t) entity->declaration.storage_class) {
4404         case STORAGE_CLASS_STATIC:
4405                 if (entity->kind == ENTITY_FUNCTION) {
4406                         (void)get_function_entity(entity, NULL);
4407                 } else {
4408                         create_local_static_variable(entity);
4409                 }
4410                 return;
4411         case STORAGE_CLASS_EXTERN:
4412                 if (entity->kind == ENTITY_FUNCTION) {
4413                         assert(entity->function.body == NULL);
4414                         (void)get_function_entity(entity, NULL);
4415                 } else {
4416                         create_global_variable(entity);
4417                         create_variable_initializer(entity);
4418                 }
4419                 return;
4420         case STORAGE_CLASS_NONE:
4421         case STORAGE_CLASS_AUTO:
4422         case STORAGE_CLASS_REGISTER:
4423                 if (entity->kind == ENTITY_FUNCTION) {
4424                         if (entity->function.body != NULL) {
4425                                 ir_type *owner = get_irg_frame_type(current_ir_graph);
4426                                 (void)get_function_entity(entity, owner);
4427                                 entity->declaration.kind = DECLARATION_KIND_INNER_FUNCTION;
4428                                 enqueue_inner_function(entity);
4429                         } else {
4430                                 (void)get_function_entity(entity, NULL);
4431                         }
4432                 } else {
4433                         create_local_variable(entity);
4434                 }
4435                 return;
4436         case STORAGE_CLASS_TYPEDEF:
4437                 break;
4438         }
4439         panic("invalid storage class");
4440 }
4441
4442 static void create_local_declarations(entity_t *e)
4443 {
4444         for (; e; e = e->base.next) {
4445                 if (is_declaration(e))
4446                         create_local_declaration(e);
4447         }
4448 }
4449
4450 static void initialize_local_declaration(entity_t *entity)
4451 {
4452         if (entity->base.symbol == NULL)
4453                 return;
4454
4455         // no need to emit code in dead blocks
4456         if (entity->declaration.storage_class != STORAGE_CLASS_STATIC
4457                         && !currently_reachable())
4458                 return;
4459
4460         switch ((declaration_kind_t) entity->declaration.kind) {
4461         case DECLARATION_KIND_LOCAL_VARIABLE:
4462         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY:
4463                 create_variable_initializer(entity);
4464                 return;
4465
4466         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
4467                 allocate_variable_length_array(entity);
4468                 return;
4469
4470         case DECLARATION_KIND_COMPOUND_MEMBER:
4471         case DECLARATION_KIND_GLOBAL_VARIABLE:
4472         case DECLARATION_KIND_FUNCTION:
4473         case DECLARATION_KIND_INNER_FUNCTION:
4474                 return;
4475
4476         case DECLARATION_KIND_PARAMETER:
4477         case DECLARATION_KIND_PARAMETER_ENTITY:
4478                 panic("can't initialize parameters");
4479
4480         case DECLARATION_KIND_UNKNOWN:
4481                 panic("can't initialize unknown declaration");
4482         }
4483         panic("invalid declaration kind");
4484 }
4485
4486 static ir_node *declaration_statement_to_firm(declaration_statement_t *statement)
4487 {
4488         entity_t *entity = statement->declarations_begin;
4489         if (entity == NULL)
4490                 return NULL;
4491
4492         entity_t *const last = statement->declarations_end;
4493         for ( ;; entity = entity->base.next) {
4494                 if (is_declaration(entity)) {
4495                         initialize_local_declaration(entity);
4496                 } else if (entity->kind == ENTITY_TYPEDEF) {
4497                         /* §6.7.7:3  Any array size expressions associated with variable length
4498                          * array declarators are evaluated each time the declaration of the
4499                          * typedef name is reached in the order of execution. */
4500                         type_t *const type = skip_typeref(entity->typedefe.type);
4501                         if (is_type_array(type) && type->array.is_vla)
4502                                 get_vla_size(&type->array);
4503                 }
4504                 if (entity == last)
4505                         break;
4506         }
4507
4508         return NULL;
4509 }
4510
4511 static ir_node *if_statement_to_firm(if_statement_t *statement)
4512 {
4513         create_local_declarations(statement->scope.entities);
4514
4515         /* Create the condition. */
4516         jump_target true_target;
4517         jump_target false_target;
4518         init_jump_target(&true_target,  NULL);
4519         init_jump_target(&false_target, NULL);
4520         if (currently_reachable())
4521                 create_condition_evaluation(statement->condition, &true_target, &false_target);
4522
4523         jump_target exit_target;
4524         init_jump_target(&exit_target, NULL);
4525
4526         /* Create the true statement. */
4527         enter_jump_target(&true_target);
4528         statement_to_firm(statement->true_statement);
4529         jump_to_target(&exit_target);
4530
4531         /* Create the false statement. */
4532         enter_jump_target(&false_target);
4533         if (statement->false_statement)
4534                 statement_to_firm(statement->false_statement);
4535         jump_to_target(&exit_target);
4536
4537         enter_jump_target(&exit_target);
4538         return NULL;
4539 }
4540
4541 static ir_node *do_while_statement_to_firm(do_while_statement_t *statement)
4542 {
4543         create_local_declarations(statement->scope.entities);
4544
4545         PUSH_BREAK(NULL);
4546         PUSH_CONTINUE(NULL);
4547
4548         expression_t *const cond = statement->condition;
4549         /* Avoid an explicit body block in case of do ... while (0);. */
4550         if (is_constant_expression(cond) == EXPR_CLASS_CONSTANT && !fold_constant_to_bool(cond)) {
4551                 /* do ... while (0);. */
4552                 statement_to_firm(statement->body);
4553                 jump_to_target(&continue_target);
4554                 enter_jump_target(&continue_target);
4555                 jump_to_target(&break_target);
4556         } else {
4557                 jump_target body_target;
4558                 init_jump_target(&body_target, NULL);
4559                 jump_to_target(&body_target);
4560                 enter_immature_jump_target(&body_target);
4561                 keep_loop();
4562                 statement_to_firm(statement->body);
4563                 jump_to_target(&continue_target);
4564                 if (enter_jump_target(&continue_target))
4565                         create_condition_evaluation(statement->condition, &body_target, &break_target);
4566                 enter_jump_target(&body_target);
4567         }
4568         enter_jump_target(&break_target);
4569
4570         POP_CONTINUE();
4571         POP_BREAK();
4572         return NULL;
4573 }
4574
4575 static ir_node *for_statement_to_firm(for_statement_t *statement)
4576 {
4577         create_local_declarations(statement->scope.entities);
4578
4579         if (currently_reachable()) {
4580                 entity_t *entity = statement->scope.entities;
4581                 for ( ; entity != NULL; entity = entity->base.next) {
4582                         if (!is_declaration(entity))
4583                                 continue;
4584
4585                         initialize_local_declaration(entity);
4586                 }
4587
4588                 if (statement->initialisation != NULL) {
4589                         expression_to_firm(statement->initialisation);
4590                 }
4591         }
4592
4593         /* Create the header block */
4594         jump_target header_target;
4595         init_jump_target(&header_target, NULL);
4596         jump_to_target(&header_target);
4597         enter_immature_jump_target(&header_target);
4598         keep_loop();
4599
4600         expression_t *const step = statement->step;
4601         PUSH_BREAK(NULL);
4602         PUSH_CONTINUE(step ? NULL : header_target.block);
4603
4604         /* Create the condition. */
4605         expression_t *const cond = statement->condition;
4606         if (cond && (is_constant_expression(cond) != EXPR_CLASS_CONSTANT || !fold_constant_to_bool(cond))) {
4607                 jump_target body_target;
4608                 init_jump_target(&body_target, NULL);
4609                 create_condition_evaluation(cond, &body_target, &break_target);
4610                 enter_jump_target(&body_target);
4611         }
4612
4613         /* Create the loop body. */
4614         statement_to_firm(statement->body);
4615         jump_to_target(&continue_target);
4616
4617         /* Create the step code. */
4618         if (step && enter_jump_target(&continue_target)) {
4619                 expression_to_firm(step);
4620                 jump_to_target(&header_target);
4621         }
4622
4623         enter_jump_target(&header_target);
4624         enter_jump_target(&break_target);
4625
4626         POP_CONTINUE();
4627         POP_BREAK();
4628         return NULL;
4629 }
4630
4631 static ir_switch_table *create_switch_table(const switch_statement_t *statement)
4632 {
4633         /* determine number of cases */
4634         size_t n_cases = 0;
4635         for (case_label_statement_t *l = statement->first_case; l != NULL;
4636              l = l->next) {
4637                 /* default case */
4638                 if (l->expression == NULL)
4639                         continue;
4640                 if (l->is_empty_range)
4641                         continue;
4642                 ++n_cases;
4643         }
4644
4645         ir_switch_table *res = ir_new_switch_table(current_ir_graph, n_cases);
4646         size_t           i   = 0;
4647         for (case_label_statement_t *l = statement->first_case; l != NULL;
4648              l = l->next) {
4649             if (l->expression == NULL) {
4650                         l->pn = pn_Switch_default;
4651                         continue;
4652                 }
4653                 if (l->is_empty_range)
4654                         continue;
4655                 ir_tarval *min = l->first_case;
4656                 ir_tarval *max = l->last_case;
4657                 long       pn  = (long) i+1;
4658                 ir_switch_table_set(res, i++, min, max, pn);
4659                 l->pn = pn;
4660         }
4661         return res;
4662 }
4663
4664 static ir_node *switch_statement_to_firm(switch_statement_t *statement)
4665 {
4666         dbg_info *dbgi        = get_dbg_info(&statement->base.pos);
4667         ir_node  *switch_node = NULL;
4668
4669         if (currently_reachable()) {
4670                 ir_node *expression = expression_to_firm(statement->expression);
4671                 ir_switch_table *table = create_switch_table(statement);
4672                 unsigned n_outs = (unsigned)ir_switch_table_get_n_entries(table) + 1;
4673
4674                 switch_node = new_d_Switch(dbgi, expression, n_outs, table);
4675         }
4676
4677         set_unreachable_now();
4678
4679         PUSH_BREAK(NULL);
4680         ir_node *const old_switch            = current_switch;
4681         const bool     old_saw_default_label = saw_default_label;
4682         saw_default_label                    = false;
4683         current_switch                       = switch_node;
4684
4685         statement_to_firm(statement->body);
4686         jump_to_target(&break_target);
4687
4688         if (!saw_default_label && switch_node) {
4689                 ir_node *proj = new_d_Proj(dbgi, switch_node, mode_X, pn_Switch_default);
4690                 add_pred_to_jump_target(&break_target, proj);
4691         }
4692
4693         enter_jump_target(&break_target);
4694
4695         assert(current_switch == switch_node);
4696         current_switch    = old_switch;
4697         saw_default_label = old_saw_default_label;
4698         POP_BREAK();
4699         return NULL;
4700 }
4701
4702 static ir_node *case_label_to_firm(const case_label_statement_t *statement)
4703 {
4704         if (current_switch != NULL && !statement->is_empty_range) {
4705                 jump_target case_target;
4706                 init_jump_target(&case_target, NULL);
4707
4708                 /* Fallthrough from previous case */
4709                 jump_to_target(&case_target);
4710
4711                 ir_node *const proj = new_Proj(current_switch, mode_X, statement->pn);
4712                 add_pred_to_jump_target(&case_target, proj);
4713                 if (statement->expression == NULL)
4714                         saw_default_label = true;
4715
4716                 enter_jump_target(&case_target);
4717         }
4718
4719         return statement_to_firm(statement->statement);
4720 }
4721
4722 static ir_node *label_to_firm(const label_statement_t *statement)
4723 {
4724         label_t *const label = statement->label;
4725         prepare_label_target(label);
4726         jump_to_target(&label->target);
4727         if (--label->n_users == 0) {
4728                 enter_jump_target(&label->target);
4729         } else {
4730                 enter_immature_jump_target(&label->target);
4731                 keep_loop();
4732         }
4733
4734         return statement_to_firm(statement->statement);
4735 }
4736
4737 static ir_node *goto_statement_to_firm(goto_statement_t *const stmt)
4738 {
4739         label_t *const label = stmt->label;
4740         prepare_label_target(label);
4741         jump_to_target(&label->target);
4742         if (--label->n_users == 0)
4743                 enter_jump_target(&label->target);
4744         set_unreachable_now();
4745         return NULL;
4746 }
4747
4748 static ir_node *computed_goto_to_firm(computed_goto_statement_t const *const statement)
4749 {
4750         if (currently_reachable()) {
4751                 ir_node *const op = expression_to_firm(statement->expression);
4752                 ARR_APP1(ir_node*, ijmp_ops, op);
4753                 jump_to_target(&ijmp_target);
4754                 set_unreachable_now();
4755         }
4756         return NULL;
4757 }
4758
4759 static ir_node *asm_statement_to_firm(const asm_statement_t *statement)
4760 {
4761         bool           needs_memory = statement->is_volatile;
4762         size_t         n_clobbers   = 0;
4763         asm_clobber_t *clobber      = statement->clobbers;
4764         for ( ; clobber != NULL; clobber = clobber->next) {
4765                 const char *clobber_str = clobber->clobber.begin;
4766
4767                 if (!be_is_valid_clobber(clobber_str)) {
4768                         errorf(&statement->base.pos,
4769                                    "invalid clobber '%s' specified", clobber->clobber);
4770                         continue;
4771                 }
4772
4773                 if (streq(clobber_str, "memory")) {
4774                         needs_memory = true;
4775                         continue;
4776                 }
4777
4778                 ident *id = new_id_from_str(clobber_str);
4779                 obstack_ptr_grow(&asm_obst, id);
4780                 ++n_clobbers;
4781         }
4782         assert(obstack_object_size(&asm_obst) == n_clobbers * sizeof(ident*));
4783         ident **clobbers = NULL;
4784         if (n_clobbers > 0) {
4785                 clobbers = obstack_finish(&asm_obst);
4786         }
4787
4788         size_t n_inputs  = 0;
4789         asm_argument_t *argument = statement->inputs;
4790         for ( ; argument != NULL; argument = argument->next)
4791                 n_inputs++;
4792         size_t n_outputs = 0;
4793         argument = statement->outputs;
4794         for ( ; argument != NULL; argument = argument->next)
4795                 n_outputs++;
4796
4797         unsigned next_pos = 0;
4798
4799         ir_node *ins[n_inputs + n_outputs + 1];
4800         size_t   in_size = 0;
4801
4802         ir_asm_constraint tmp_in_constraints[n_outputs];
4803
4804         const expression_t *out_exprs[n_outputs];
4805         ir_node            *out_addrs[n_outputs];
4806         size_t              out_size = 0;
4807
4808         argument = statement->outputs;
4809         for ( ; argument != NULL; argument = argument->next) {
4810                 const char *constraints = argument->constraints.begin;
4811                 asm_constraint_flags_t asm_flags
4812                         = be_parse_asm_constraints(constraints);
4813
4814                 {
4815                         position_t const *const pos = &statement->base.pos;
4816                         if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
4817                                 warningf(WARN_OTHER, pos, "some constraints in '%s' are not supported", constraints);
4818                         }
4819                         if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
4820                                 errorf(pos, "some constraints in '%s' are invalid", constraints);
4821                                 continue;
4822                         }
4823                         if (! (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE)) {
4824                                 errorf(pos, "no write flag specified for output constraints '%s'", constraints);
4825                                 continue;
4826                         }
4827                 }
4828
4829                 unsigned pos = next_pos++;
4830                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
4831                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
4832                         expression_t *expr = argument->expression;
4833                         ir_node      *addr = expression_to_addr(expr);
4834                         /* in+output, construct an artifical same_as constraint on the
4835                          * input */
4836                         if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_READ) {
4837                                 char     buf[64];
4838                                 ir_node *value = get_value_from_lvalue(expr, addr);
4839
4840                                 snprintf(buf, sizeof(buf), "%u", (unsigned) out_size);
4841
4842                                 ir_asm_constraint constraint;
4843                                 constraint.pos              = pos;
4844                                 constraint.constraint       = new_id_from_str(buf);
4845                                 constraint.mode             = get_ir_mode_storage(expr->base.type);
4846                                 tmp_in_constraints[in_size] = constraint;
4847                                 ins[in_size] = value;
4848
4849                                 ++in_size;
4850                         }
4851
4852                         out_exprs[out_size] = expr;
4853                         out_addrs[out_size] = addr;
4854                         ++out_size;
4855                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
4856                         /* pure memory ops need no input (but we have to make sure we
4857                          * attach to the memory) */
4858                         assert(! (asm_flags &
4859                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
4860                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
4861                         needs_memory = true;
4862
4863                         /* we need to attach the address to the inputs */
4864                         expression_t *expr = argument->expression;
4865
4866                         ir_asm_constraint constraint;
4867                         constraint.pos              = pos;
4868                         constraint.constraint       = new_id_from_str(constraints);
4869                         constraint.mode             = mode_M;
4870                         tmp_in_constraints[in_size] = constraint;
4871
4872                         ins[in_size] = expression_to_addr(expr);
4873                         ++in_size;
4874                         continue;
4875                 } else {
4876                         errorf(&statement->base.pos,
4877                                "only modifiers but no place set in constraints '%s'",
4878                                constraints);
4879                         continue;
4880                 }
4881
4882                 ir_asm_constraint constraint;
4883                 constraint.pos        = pos;
4884                 constraint.constraint = new_id_from_str(constraints);
4885                 constraint.mode       = get_ir_mode_storage(argument->expression->base.type);
4886
4887                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
4888         }
4889         assert(obstack_object_size(&asm_obst)
4890                         == out_size * sizeof(ir_asm_constraint));
4891         ir_asm_constraint *output_constraints = obstack_finish(&asm_obst);
4892
4893
4894         obstack_grow(&asm_obst, tmp_in_constraints,
4895                      in_size * sizeof(tmp_in_constraints[0]));
4896         /* find and count input and output arguments */
4897         argument = statement->inputs;
4898         for ( ; argument != NULL; argument = argument->next) {
4899                 const char *constraints = argument->constraints.begin;
4900                 asm_constraint_flags_t asm_flags
4901                         = be_parse_asm_constraints(constraints);
4902
4903                 if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
4904                         errorf(&statement->base.pos,
4905                                "some constraints in '%s' are not supported", constraints);
4906                         continue;
4907                 }
4908                 if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
4909                         errorf(&statement->base.pos,
4910                                "some constraints in '%s' are invalid", constraints);
4911                         continue;
4912                 }
4913                 if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE) {
4914                         errorf(&statement->base.pos,
4915                                "write flag specified for input constraints '%s'",
4916                                constraints);
4917                         continue;
4918                 }
4919
4920                 ir_node *input;
4921                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
4922                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
4923                         /* we can treat this as "normal" input */
4924                         input = expression_to_firm(argument->expression);
4925                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
4926                         /* pure memory ops need no input (but we have to make sure we
4927                          * attach to the memory) */
4928                         assert(! (asm_flags &
4929                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
4930                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
4931                         needs_memory = true;
4932                         input = expression_to_addr(argument->expression);
4933                 } else {
4934                         errorf(&statement->base.pos,
4935                                "only modifiers but no place set in constraints '%s'",
4936                                constraints);
4937                         continue;
4938                 }
4939
4940                 ir_asm_constraint constraint;
4941                 constraint.pos        = next_pos++;
4942                 constraint.constraint = new_id_from_str(constraints);
4943                 constraint.mode       = get_irn_mode(input);
4944
4945                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
4946                 ins[in_size++] = input;
4947         }
4948
4949         ir_node *mem = needs_memory ? get_store() : new_NoMem();
4950         assert(obstack_object_size(&asm_obst)
4951                         == in_size * sizeof(ir_asm_constraint));
4952         ir_asm_constraint *input_constraints = obstack_finish(&asm_obst);
4953
4954         /* create asm node */
4955         dbg_info *dbgi = get_dbg_info(&statement->base.pos);
4956
4957         ident *asm_text = new_id_from_str(statement->asm_text.begin);
4958
4959         ir_node *node = new_d_ASM(dbgi, mem, in_size, ins, input_constraints,
4960                                   out_size, output_constraints,
4961                                   n_clobbers, clobbers, asm_text);
4962
4963         if (statement->is_volatile) {
4964                 set_irn_pinned(node, op_pin_state_pinned);
4965         } else {
4966                 set_irn_pinned(node, op_pin_state_floats);
4967         }
4968
4969         /* create output projs & connect them */
4970         if (needs_memory) {
4971                 ir_node *projm = new_Proj(node, mode_M, out_size);
4972                 set_store(projm);
4973         }
4974
4975         size_t i;
4976         for (i = 0; i < out_size; ++i) {
4977                 const expression_t *out_expr = out_exprs[i];
4978                 long                pn       = i;
4979                 ir_mode            *mode     = get_ir_mode_storage(out_expr->base.type);
4980                 ir_node            *proj     = new_Proj(node, mode, pn);
4981                 ir_node            *addr     = out_addrs[i];
4982
4983                 set_value_for_expression_addr(out_expr, proj, addr);
4984         }
4985
4986         return NULL;
4987 }
4988
4989 static ir_node *ms_try_statement_to_firm(ms_try_statement_t *statement)
4990 {
4991         statement_to_firm(statement->try_statement);
4992         position_t const *const pos = &statement->base.pos;
4993         warningf(WARN_OTHER, pos, "structured exception handling ignored");
4994         return NULL;
4995 }
4996
4997 static ir_node *leave_statement_to_firm(leave_statement_t *statement)
4998 {
4999         errorf(&statement->base.pos, "__leave not supported yet");
5000         return NULL;
5001 }
5002
5003 /**
5004  * Transform a statement.
5005  */
5006 static ir_node *statement_to_firm(statement_t *const stmt)
5007 {
5008 #ifndef NDEBUG
5009         assert(!stmt->base.transformed);
5010         stmt->base.transformed = true;
5011 #endif
5012
5013         switch (stmt->kind) {
5014         case STATEMENT_ASM:           return asm_statement_to_firm(        &stmt->asms);
5015         case STATEMENT_CASE_LABEL:    return case_label_to_firm(           &stmt->case_label);
5016         case STATEMENT_COMPOUND:      return compound_statement_to_firm(   &stmt->compound);
5017         case STATEMENT_COMPUTED_GOTO: return computed_goto_to_firm(        &stmt->computed_goto);
5018         case STATEMENT_DECLARATION:   return declaration_statement_to_firm(&stmt->declaration);
5019         case STATEMENT_DO_WHILE:      return do_while_statement_to_firm(   &stmt->do_while);
5020         case STATEMENT_EMPTY:         return NULL; /* nothing */
5021         case STATEMENT_EXPRESSION:    return expression_statement_to_firm( &stmt->expression);
5022         case STATEMENT_FOR:           return for_statement_to_firm(        &stmt->fors);
5023         case STATEMENT_GOTO:          return goto_statement_to_firm(       &stmt->gotos);
5024         case STATEMENT_IF:            return if_statement_to_firm(         &stmt->ifs);
5025         case STATEMENT_LABEL:         return label_to_firm(                &stmt->label);
5026         case STATEMENT_LEAVE:         return leave_statement_to_firm(      &stmt->leave);
5027         case STATEMENT_MS_TRY:        return ms_try_statement_to_firm(     &stmt->ms_try);
5028         case STATEMENT_RETURN:        return return_statement_to_firm(     &stmt->returns);
5029         case STATEMENT_SWITCH:        return switch_statement_to_firm(     &stmt->switchs);
5030
5031         {
5032                 jump_target *tgt;
5033         case STATEMENT_BREAK:    tgt = &break_target;    goto jump;
5034         case STATEMENT_CONTINUE: tgt = &continue_target; goto jump;
5035 jump:
5036                 jump_to_target(tgt);
5037                 set_unreachable_now();
5038                 return NULL;
5039         }
5040
5041         case STATEMENT_ERROR: panic("error statement");
5042         }
5043         panic("statement not implemented");
5044 }
5045
5046 static int count_local_variables(const entity_t *entity,
5047                                  const entity_t *const last)
5048 {
5049         int count = 0;
5050         entity_t const *const end = last != NULL ? last->base.next : NULL;
5051         for (; entity != end; entity = entity->base.next) {
5052                 if ((entity->kind == ENTITY_VARIABLE || entity->kind == ENTITY_PARAMETER) &&
5053                     !var_needs_entity(&entity->variable))
5054                         ++count;
5055         }
5056         return count;
5057 }
5058
5059 static void count_local_variables_in_stmt(statement_t *stmt, void *const env)
5060 {
5061         int *const count = env;
5062
5063         switch (stmt->kind) {
5064         case STATEMENT_DECLARATION: {
5065                 const declaration_statement_t *const decl_stmt = &stmt->declaration;
5066                 *count += count_local_variables(decl_stmt->declarations_begin,
5067                                 decl_stmt->declarations_end);
5068                 break;
5069         }
5070
5071         case STATEMENT_FOR:
5072                 *count += count_local_variables(stmt->fors.scope.entities, NULL);
5073                 break;
5074
5075         default:
5076                 break;
5077         }
5078 }
5079
5080 /**
5081  * Return the number of local (alias free) variables used by a function.
5082  */
5083 static int get_function_n_local_vars(entity_t *entity)
5084 {
5085         const function_t *function = &entity->function;
5086         int count = 0;
5087
5088         /* count parameters */
5089         count += count_local_variables(function->parameters.entities, NULL);
5090
5091         /* count local variables declared in body */
5092         walk_statements(function->body, count_local_variables_in_stmt, &count);
5093         return count;
5094 }
5095
5096 /**
5097  * Build Firm code for the parameters of a function.
5098  */
5099 static void initialize_function_parameters(entity_t *entity)
5100 {
5101         assert(entity->kind == ENTITY_FUNCTION);
5102         ir_graph *irg             = current_ir_graph;
5103         ir_node  *args            = get_irg_args(irg);
5104         int       n               = 0;
5105         ir_type  *function_irtype;
5106
5107         if (entity->function.need_closure) {
5108                 /* add an extra parameter for the static link */
5109                 entity->function.static_link = new_r_Proj(args, mode_P_data, 0);
5110                 ++n;
5111
5112                 /* Matze: IMO this is wrong, nested functions should have an own
5113                  * type and not rely on strange parameters... */
5114                 function_irtype = create_method_type(&entity->declaration.type->function, true);
5115         } else {
5116                 function_irtype = get_ir_type(entity->declaration.type);
5117         }
5118
5119
5120
5121         entity_t *parameter = entity->function.parameters.entities;
5122         for ( ; parameter != NULL; parameter = parameter->base.next, ++n) {
5123                 if (parameter->kind != ENTITY_PARAMETER)
5124                         continue;
5125
5126                 assert(parameter->declaration.kind == DECLARATION_KIND_UNKNOWN);
5127                 type_t *type = skip_typeref(parameter->declaration.type);
5128
5129                 dbg_info *const dbgi         = get_dbg_info(&parameter->base.pos);
5130                 ir_type  *const param_irtype = get_method_param_type(function_irtype, n);
5131                 if (var_needs_entity(&parameter->variable)) {
5132                         ir_type   *frame_type = get_irg_frame_type(irg);
5133                         ir_entity *param
5134                                 = new_d_parameter_entity(frame_type, n, param_irtype, dbgi);
5135                         parameter->declaration.kind  = DECLARATION_KIND_PARAMETER_ENTITY;
5136                         parameter->variable.v.entity = param;
5137                         continue;
5138                 }
5139
5140                 ir_mode *param_mode = get_type_mode(param_irtype);
5141                 long     pn         = n;
5142                 ir_node *value      = new_rd_Proj(dbgi, args, param_mode, pn);
5143
5144                 ir_mode *mode = get_ir_mode_storage(type);
5145                 value = create_conv(NULL, value, mode);
5146
5147                 parameter->declaration.kind        = DECLARATION_KIND_PARAMETER;
5148                 parameter->variable.v.value_number = next_value_number_function;
5149                 set_irg_loc_description(current_ir_graph, next_value_number_function,
5150                                         parameter);
5151                 ++next_value_number_function;
5152
5153                 set_value(parameter->variable.v.value_number, value);
5154         }
5155 }
5156
5157 static void add_function_pointer(ir_type *segment, ir_entity *method,
5158                                  const char *unique_template)
5159 {
5160         ir_type   *method_type  = get_entity_type(method);
5161         ir_type   *ptr_type     = new_type_pointer(method_type);
5162
5163         /* these entities don't really have a name but firm only allows
5164          * "" in ld_ident.
5165          * Note that we mustn't give these entities a name since for example
5166          * Mach-O doesn't allow them. */
5167         ident     *ide          = id_unique(unique_template);
5168         ir_entity *ptr          = new_entity(segment, ide, ptr_type);
5169         ir_graph  *irg          = get_const_code_irg();
5170         ir_node   *val          = new_rd_SymConst_addr_ent(NULL, irg, mode_P_code,
5171                                                            method);
5172
5173         set_entity_ld_ident(ptr, new_id_from_chars("", 0));
5174         set_entity_compiler_generated(ptr, 1);
5175         set_entity_visibility(ptr, ir_visibility_private);
5176         add_entity_linkage(ptr, IR_LINKAGE_CONSTANT|IR_LINKAGE_HIDDEN_USER);
5177         set_atomic_ent_value(ptr, val);
5178 }
5179
5180 /**
5181  * Create code for a function and all inner functions.
5182  *
5183  * @param entity  the function entity
5184  */
5185 static void create_function(entity_t *entity)
5186 {
5187         assert(entity->kind == ENTITY_FUNCTION);
5188         ir_entity *function_entity = get_function_entity(entity, current_outer_frame);
5189
5190         if (entity->function.body == NULL)
5191                 return;
5192
5193         inner_functions     = NULL;
5194         current_trampolines = NULL;
5195
5196         if (entity->declaration.modifiers & DM_CONSTRUCTOR) {
5197                 ir_type *segment = get_segment_type(IR_SEGMENT_CONSTRUCTORS);
5198                 add_function_pointer(segment, function_entity, "constructor_ptr.%u");
5199         }
5200         if (entity->declaration.modifiers & DM_DESTRUCTOR) {
5201                 ir_type *segment = get_segment_type(IR_SEGMENT_DESTRUCTORS);
5202                 add_function_pointer(segment, function_entity, "destructor_ptr.%u");
5203         }
5204
5205         current_function_entity = entity;
5206         current_function_name   = NULL;
5207         current_funcsig         = NULL;
5208
5209         assert(!ijmp_ops);
5210         assert(!ijmp_blocks);
5211         init_jump_target(&ijmp_target, NULL);
5212         ijmp_ops    = NEW_ARR_F(ir_node*, 0);
5213         ijmp_blocks = NEW_ARR_F(ir_node*, 0);
5214
5215         int       n_local_vars = get_function_n_local_vars(entity);
5216         ir_graph *irg          = new_ir_graph(function_entity, n_local_vars);
5217         current_ir_graph = irg;
5218
5219         ir_graph *old_current_function = current_function;
5220         current_function = irg;
5221
5222         ir_entity *const old_current_vararg_entity = current_vararg_entity;
5223         current_vararg_entity = NULL;
5224
5225         set_irg_fp_model(irg, firm_fp_model);
5226         tarval_enable_fp_ops(1);
5227         set_irn_dbg_info(get_irg_start_block(irg),
5228                          get_entity_dbg_info(function_entity));
5229
5230         next_value_number_function = 0;
5231         initialize_function_parameters(entity);
5232         current_static_link = entity->function.static_link;
5233
5234         statement_to_firm(entity->function.body);
5235
5236         ir_node *end_block = get_irg_end_block(irg);
5237
5238         /* do we have a return statement yet? */
5239         if (currently_reachable()) {
5240                 type_t *type = skip_typeref(entity->declaration.type);
5241                 assert(is_type_function(type));
5242                 type_t *const return_type = skip_typeref(type->function.return_type);
5243
5244                 ir_node *ret;
5245                 if (is_type_void(return_type)) {
5246                         ret = new_Return(get_store(), 0, NULL);
5247                 } else {
5248                         ir_mode *const mode = get_ir_mode_storage(return_type);
5249
5250                         ir_node *in[1];
5251                         /* §5.1.2.2.3 main implicitly returns 0 */
5252                         if (is_main(entity)) {
5253                                 in[0] = new_Const(get_mode_null(mode));
5254                         } else {
5255                                 in[0] = new_Unknown(mode);
5256                         }
5257                         ret = new_Return(get_store(), 1, in);
5258                 }
5259                 add_immBlock_pred(end_block, ret);
5260         }
5261
5262         if (enter_jump_target(&ijmp_target)) {
5263                 keep_loop();
5264                 size_t   const n    = ARR_LEN(ijmp_ops);
5265                 ir_node *const op   = n == 1 ? ijmp_ops[0] : new_Phi(n, ijmp_ops, get_irn_mode(ijmp_ops[0]));
5266                 ir_node *const ijmp = new_IJmp(op);
5267                 for (size_t i = ARR_LEN(ijmp_blocks); i-- != 0;) {
5268                         ir_node *const block = ijmp_blocks[i];
5269                         add_immBlock_pred(block, ijmp);
5270                         mature_immBlock(block);
5271                 }
5272         }
5273
5274         DEL_ARR_F(ijmp_ops);
5275         DEL_ARR_F(ijmp_blocks);
5276         ijmp_ops    = NULL;
5277         ijmp_blocks = NULL;
5278
5279         irg_finalize_cons(irg);
5280
5281         /* finalize the frame type */
5282         ir_type *frame_type = get_irg_frame_type(irg);
5283         int      n          = get_compound_n_members(frame_type);
5284         int      align_all  = 4;
5285         int      offset     = 0;
5286         for (int i = 0; i < n; ++i) {
5287                 ir_entity *member      = get_compound_member(frame_type, i);
5288                 ir_type   *entity_type = get_entity_type(member);
5289
5290                 int align = get_type_alignment_bytes(entity_type);
5291                 if (align > align_all)
5292                         align_all = align;
5293                 int misalign = 0;
5294                 if (align > 0) {
5295                         misalign  = offset % align;
5296                         if (misalign > 0) {
5297                                 offset += align - misalign;
5298                         }
5299                 }
5300
5301                 set_entity_offset(member, offset);
5302                 offset += get_type_size_bytes(entity_type);
5303         }
5304         set_type_size_bytes(frame_type, offset);
5305         set_type_alignment_bytes(frame_type, align_all);
5306
5307         irg_verify(irg, VERIFY_ENFORCE_SSA);
5308         current_vararg_entity = old_current_vararg_entity;
5309         current_function      = old_current_function;
5310
5311         if (current_trampolines != NULL) {
5312                 DEL_ARR_F(current_trampolines);
5313                 current_trampolines = NULL;
5314         }
5315
5316         /* create inner functions if any */
5317         entity_t **inner = inner_functions;
5318         if (inner != NULL) {
5319                 ir_type *rem_outer_frame      = current_outer_frame;
5320                 current_outer_frame           = get_irg_frame_type(current_ir_graph);
5321                 for (int i = ARR_LEN(inner) - 1; i >= 0; --i) {
5322                         create_function(inner[i]);
5323                 }
5324                 DEL_ARR_F(inner);
5325
5326                 current_outer_frame      = rem_outer_frame;
5327         }
5328 }
5329
5330 static void scope_to_firm(scope_t *scope)
5331 {
5332         /* first pass: create declarations */
5333         entity_t *entity = scope->entities;
5334         for ( ; entity != NULL; entity = entity->base.next) {
5335                 if (entity->base.symbol == NULL)
5336                         continue;
5337
5338                 if (entity->kind == ENTITY_FUNCTION) {
5339                         if (entity->function.btk != BUILTIN_NONE) {
5340                                 /* builtins have no representation */
5341                                 continue;
5342                         }
5343                         (void)get_function_entity(entity, NULL);
5344                 } else if (entity->kind == ENTITY_VARIABLE) {
5345                         create_global_variable(entity);
5346                 } else if (entity->kind == ENTITY_NAMESPACE) {
5347                         scope_to_firm(&entity->namespacee.members);
5348                 }
5349         }
5350
5351         /* second pass: create code/initializers */
5352         entity = scope->entities;
5353         for ( ; entity != NULL; entity = entity->base.next) {
5354                 if (entity->base.symbol == NULL)
5355                         continue;
5356
5357                 if (entity->kind == ENTITY_FUNCTION) {
5358                         if (entity->function.btk != BUILTIN_NONE) {
5359                                 /* builtins have no representation */
5360                                 continue;
5361                         }
5362                         create_function(entity);
5363                 } else if (entity->kind == ENTITY_VARIABLE) {
5364                         assert(entity->declaration.kind
5365                                         == DECLARATION_KIND_GLOBAL_VARIABLE);
5366                         current_ir_graph = get_const_code_irg();
5367                         create_variable_initializer(entity);
5368                 }
5369         }
5370 }
5371
5372 void init_ast2firm(void)
5373 {
5374         obstack_init(&asm_obst);
5375         init_atomic_modes();
5376
5377         ir_set_debug_retrieve(dbg_retrieve);
5378         ir_set_type_debug_retrieve(dbg_print_type_dbg_info);
5379
5380         /* create idents for all known runtime functions */
5381         for (size_t i = 0; i < lengthof(rts_data); ++i) {
5382                 rts_idents[i] = new_id_from_str(rts_data[i].name);
5383         }
5384
5385         entitymap_init(&entitymap);
5386 }
5387
5388 static void init_ir_types(void)
5389 {
5390         static int ir_types_initialized = 0;
5391         if (ir_types_initialized)
5392                 return;
5393         ir_types_initialized = 1;
5394
5395         ir_type_char = get_ir_type(type_char);
5396
5397         be_params             = be_get_backend_param();
5398         mode_float_arithmetic = be_params->mode_float_arithmetic;
5399
5400         stack_param_align     = be_params->stack_param_align;
5401 }
5402
5403 void exit_ast2firm(void)
5404 {
5405         entitymap_destroy(&entitymap);
5406         obstack_free(&asm_obst, NULL);
5407 }
5408
5409 static void global_asm_to_firm(statement_t *s)
5410 {
5411         for (; s != NULL; s = s->base.next) {
5412                 assert(s->kind == STATEMENT_ASM);
5413
5414                 char const *const text = s->asms.asm_text.begin;
5415                 size_t      const size = s->asms.asm_text.size;
5416                 ident      *const id   = new_id_from_chars(text, size);
5417                 add_irp_asm(id);
5418         }
5419 }
5420
5421 static const char *get_cwd(void)
5422 {
5423         static char buf[1024];
5424         if (buf[0] == '\0') {
5425                 return getcwd(buf, sizeof(buf));
5426         }
5427         return buf;
5428 }
5429
5430 void translation_unit_to_firm(translation_unit_t *unit)
5431 {
5432         if (c_mode & _CXX) {
5433                 be_dwarf_set_source_language(DW_LANG_C_plus_plus);
5434         } else if (c_mode & _C99) {
5435                 be_dwarf_set_source_language(DW_LANG_C99);
5436         } else if (c_mode & _C89) {
5437                 be_dwarf_set_source_language(DW_LANG_C89);
5438         } else {
5439                 be_dwarf_set_source_language(DW_LANG_C);
5440         }
5441         const char *cwd = get_cwd();
5442         if (cwd != NULL) {
5443                 be_dwarf_set_compilation_directory(cwd);
5444         }
5445
5446         /* initialize firm arithmetic */
5447         tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
5448         ir_set_uninitialized_local_variable_func(uninitialized_local_var);
5449
5450         /* just to be sure */
5451         init_jump_target(&break_target,    NULL);
5452         init_jump_target(&continue_target, NULL);
5453         current_switch           = NULL;
5454         current_translation_unit = unit;
5455
5456         init_ir_types();
5457
5458         scope_to_firm(&unit->scope);
5459         global_asm_to_firm(unit->global_asm);
5460
5461         current_ir_graph         = NULL;
5462         current_translation_unit = NULL;
5463 }