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