nsz Git - cparser/blob - ast2firm.c

   1 /*
   2  * This file is part of cparser.
   3  * Copyright (C) 2007-2008 Matthias Braun <matze@braunis.de>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  18  * 02111-1307, USA.
  19  */
  20 #include <config.h>
  21
  22 #include <assert.h>
  23 #include <string.h>
  24 #include <stdbool.h>
  25 #include <limits.h>
  26
  27 #include <libfirm/firm.h>
  28 #include <libfirm/adt/obst.h>
  29 #include <libfirm/be.h>
  30
  31 #include "ast2firm.h"
  32
  33 #include "adt/error.h"
  34 #include "adt/array.h"
  35 #include "symbol_t.h"
  36 #include "token_t.h"
  37 #include "type_t.h"
  38 #include "ast_t.h"
  39 #include "entity_t.h"
  40 #include "parser.h"
  41 #include "diagnostic.h"
  42 #include "lang_features.h"
  43 #include "types.h"
  44 #include "type_hash.h"
  45 #include "mangle.h"
  46 #include "walk_statements.h"
  47 #include "warning.h"
  48 #include "entitymap_t.h"
  49 #include "driver/firm_opt.h"
  50 #include "driver/firm_cmdline.h"
  51
  52 static ir_type *ir_type_const_char;
  53 static ir_type *ir_type_wchar_t;
  54 static ir_type *ir_type_void;
  55 static ir_type *ir_type_int;
  56
  57 static int        next_value_number_function;
  58 static ir_node   *continue_label;
  59 static ir_node   *break_label;
  60 static ir_node   *current_switch_cond;
  61 static bool       saw_default_label;
  62 static label_t  **all_labels;
  63 static entity_t **inner_functions;
  64 static ir_node   *ijmp_list;
  65 static bool       constant_folding;
  66
  67 extern bool       have_const_functions;
  68
  69 static const entity_t     *current_function_entity;
  70 static ir_node            *current_function_name;
  71 static ir_node            *current_funcsig;
  72 static switch_statement_t *current_switch;
  73 static ir_graph           *current_function;
  74 static translation_unit_t *current_translation_unit;
  75
  76 static entitymap_t  entitymap;
  77
  78 static struct obstack asm_obst;
  79
  80 typedef enum declaration_kind_t {
  81         DECLARATION_KIND_UNKNOWN,
  82         DECLARATION_KIND_VARIABLE_LENGTH_ARRAY,
  83         DECLARATION_KIND_GLOBAL_VARIABLE,
  84         DECLARATION_KIND_LOCAL_VARIABLE,
  85         DECLARATION_KIND_LOCAL_VARIABLE_ENTITY,
  86         DECLARATION_KIND_PARAMETER,
  87         DECLARATION_KIND_PARAMETER_ENTITY,
  88         DECLARATION_KIND_FUNCTION,
  89         DECLARATION_KIND_COMPOUND_MEMBER,
  90         DECLARATION_KIND_INNER_FUNCTION
  91 } declaration_kind_t;
  92
  93 static ir_mode *get_ir_mode(type_t *type);
  94 static ir_type *get_ir_type_incomplete(type_t *type);
  95
  96 static void enqueue_inner_function(entity_t *entity)
  97 {
  98         ARR_APP1(entity_t*, inner_functions, entity);
  99 }
 100
 101 static entity_t *next_inner_function(void)
 102 {
 103         int len = ARR_LEN(inner_functions);
 104         if (len == 0)
 105                 return NULL;
 106
 107         entity_t *entity = inner_functions[len-1];
 108         ARR_SHRINKLEN(inner_functions, len-1);
 109
 110         return entity;
 111 }
 112
 113 ir_node *uninitialized_local_var(ir_graph *irg, ir_mode *mode, int pos)
 114 {
 115         const entity_t *entity = get_irg_loc_description(irg, pos);
 116
 117         if (entity != NULL) {
 118                 warningf(&entity->base.source_position,
 119                          "%s '%#T' might be used uninitialized",
 120                          get_entity_kind_name(entity->kind),
 121                          entity->declaration.type, entity->base.symbol);
 122         }
 123         return new_r_Unknown(irg, mode);
 124 }
 125
 126 unsigned dbg_snprint(char *buf, unsigned len, const dbg_info *dbg)
 127 {
 128         const source_position_t *pos = (const source_position_t*) dbg;
 129         if (pos == NULL)
 130                 return 0;
 131         return (unsigned) snprintf(buf, len, "%s:%u", pos->input_name,
 132                                    pos->linenr);
 133 }
 134
 135 const char *dbg_retrieve(const dbg_info *dbg, unsigned *line)
 136 {
 137         const source_position_t *pos = (const source_position_t*) dbg;
 138         if (pos == NULL)
 139                 return NULL;
 140         if (line != NULL)
 141                 *line = pos->linenr;
 142         return pos->input_name;
 143 }
 144
 145 static dbg_info *get_dbg_info(const source_position_t *pos)
 146 {
 147         return (dbg_info*) pos;
 148 }
 149
 150 static ir_mode *atomic_modes[ATOMIC_TYPE_LAST+1];
 151
 152 static ir_mode *mode_int, *mode_uint;
 153
 154 static ir_node *_expression_to_firm(const expression_t *expression);
 155 static ir_node *expression_to_firm(const expression_t *expression);
 156 static void create_local_declaration(entity_t *entity);
 157
 158 static ir_mode *init_atomic_ir_mode(atomic_type_kind_t kind)
 159 {
 160         unsigned flags = get_atomic_type_flags(kind);
 161         unsigned size  = get_atomic_type_size(kind);
 162         if ( (flags & (ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_FLOAT))
 163                         && !(flags & ATOMIC_TYPE_FLAG_COMPLEX)) {
 164                 char            name[64];
 165                 ir_mode_sort    sort;
 166                 unsigned        bit_size     = size * 8;
 167                 bool            is_signed    = (flags & ATOMIC_TYPE_FLAG_SIGNED) != 0;
 168                 unsigned        modulo_shift;
 169                 ir_mode_arithmetic arithmetic;
 170
 171                 if (flags & ATOMIC_TYPE_FLAG_INTEGER) {
 172                         assert(! (flags & ATOMIC_TYPE_FLAG_FLOAT));
 173                         snprintf(name, sizeof(name), "%s%u", is_signed ? "I" : "U",
 174                                  bit_size);
 175                         sort         = irms_int_number;
 176                         arithmetic   = irma_twos_complement;
 177                         modulo_shift = bit_size < machine_size ? machine_size : bit_size;
 178                 } else {
 179                         assert(flags & ATOMIC_TYPE_FLAG_FLOAT);
 180                         snprintf(name, sizeof(name), "F%u", bit_size);
 181                         sort         = irms_float_number;
 182                         arithmetic   = irma_ieee754;
 183                         modulo_shift = 0;
 184                 }
 185                 return new_ir_mode(name, sort, bit_size, is_signed, arithmetic,
 186                                    modulo_shift);
 187         }
 188
 189         return NULL;
 190 }
 191
 192 /**
 193  * Initialises the atomic modes depending on the machine size.
 194  */
 195 static void init_atomic_modes(void)
 196 {
 197         for (int i = 0; i <= ATOMIC_TYPE_LAST; ++i) {
 198                 atomic_modes[i] = init_atomic_ir_mode((atomic_type_kind_t) i);
 199         }
 200         mode_int  = atomic_modes[ATOMIC_TYPE_INT];
 201         mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
 202
 203         /* there's no real void type in firm */
 204         atomic_modes[ATOMIC_TYPE_VOID] = mode_int;
 205
 206         /* initialize pointer modes */
 207         char            name[64];
 208         ir_mode_sort    sort         = irms_reference;
 209         unsigned        bit_size     = machine_size;
 210         bool            is_signed    = 0;
 211         ir_mode_arithmetic arithmetic   = irma_twos_complement;
 212         unsigned        modulo_shift
 213                 = bit_size < machine_size ? machine_size : bit_size;
 214
 215         snprintf(name, sizeof(name), "p%u", machine_size);
 216         ir_mode *ptr_mode = new_ir_mode(name, sort, bit_size, is_signed, arithmetic,
 217                                         modulo_shift);
 218
 219         set_reference_mode_signed_eq(ptr_mode, atomic_modes[get_intptr_kind()]);
 220         set_reference_mode_unsigned_eq(ptr_mode, atomic_modes[get_uintptr_kind()]);
 221
 222         /* Hmm, pointers should be machine size */
 223         set_modeP_data(ptr_mode);
 224         set_modeP_code(ptr_mode);
 225 }
 226
 227 ir_mode *get_atomic_mode(atomic_type_kind_t kind)
 228 {
 229         assert(kind <= ATOMIC_TYPE_LAST);
 230         return atomic_modes[kind];
 231 }
 232
 233 static unsigned get_compound_type_size(compound_type_t *type)
 234 {
 235         ir_type *irtype = get_ir_type((type_t*) type);
 236         return get_type_size_bytes(irtype);
 237 }
 238
 239 static unsigned get_array_type_size(array_type_t *type)
 240 {
 241         assert(!type->is_vla);
 242         ir_type *irtype = get_ir_type((type_t*) type);
 243         return get_type_size_bytes(irtype);
 244 }
 245
 246 static unsigned get_type_size_const(type_t *type)
 247 {
 248         switch(type->kind) {
 249         case TYPE_ERROR:
 250                 panic("error type occurred");
 251         case TYPE_ATOMIC:
 252                 return get_atomic_type_size(type->atomic.akind);
 253         case TYPE_COMPLEX:
 254                 return 2 * get_atomic_type_size(type->complex.akind);
 255         case TYPE_IMAGINARY:
 256                 return get_atomic_type_size(type->imaginary.akind);
 257         case TYPE_ENUM:
 258                 return get_mode_size_bytes(mode_int);
 259         case TYPE_COMPOUND_UNION:
 260         case TYPE_COMPOUND_STRUCT:
 261                 return get_compound_type_size(&type->compound);
 262         case TYPE_FUNCTION:
 263                 /* just a pointer to the function */
 264                 return get_mode_size_bytes(mode_P_code);
 265         case TYPE_POINTER:
 266         case TYPE_REFERENCE:
 267                 return get_mode_size_bytes(mode_P_data);
 268         case TYPE_ARRAY:
 269                 return get_array_type_size(&type->array);
 270         case TYPE_BUILTIN:
 271                 return get_type_size_const(type->builtin.real_type);
 272         case TYPE_BITFIELD:
 273                 panic("type size of bitfield request");
 274         case TYPE_TYPEDEF:
 275         case TYPE_TYPEOF:
 276         case TYPE_INVALID:
 277                 break;
 278         }
 279         panic("Trying to determine size of invalid type");
 280 }
 281
 282 static ir_node *get_type_size(type_t *type)
 283 {
 284         type = skip_typeref(type);
 285
 286         if (is_type_array(type) && type->array.is_vla) {
 287                 ir_node *size_node = type->array.size_node;
 288                 if (size_node == NULL) {
 289                         size_node = expression_to_firm(type->array.size_expression);
 290                         type->array.size_node = size_node;
 291                 }
 292
 293                 ir_node *elem_size = get_type_size(type->array.element_type);
 294                 ir_mode *mode      = get_irn_mode(size_node);
 295                 ir_node *real_size = new_d_Mul(NULL, size_node, elem_size, mode);
 296                 return real_size;
 297         }
 298
 299         ir_mode *mode = get_ir_mode(type_size_t);
 300         symconst_symbol sym;
 301         sym.type_p = get_ir_type(type);
 302         return new_SymConst(mode, sym, symconst_type_size);
 303 }
 304
 305 static unsigned count_parameters(const function_type_t *function_type)
 306 {
 307         unsigned count = 0;
 308
 309         function_parameter_t *parameter = function_type->parameters;
 310         for ( ; parameter != NULL; parameter = parameter->next) {
 311                 ++count;
 312         }
 313
 314         return count;
 315 }
 316
 317 /**
 318  * Creates a Firm type for an atomic type
 319  */
 320 static ir_type *create_atomic_type(const atomic_type_t *type)
 321 {
 322         atomic_type_kind_t  kind   = type->akind;
 323         ir_mode            *mode   = atomic_modes[kind];
 324         ident              *id     = get_mode_ident(mode);
 325         ir_type            *irtype = new_type_primitive(id, mode);
 326
 327         set_type_alignment_bytes(irtype, type->base.alignment);
 328
 329         return irtype;
 330 }
 331
 332 /**
 333  * Creates a Firm type for a complex type
 334  */
 335 static ir_type *create_complex_type(const complex_type_t *type)
 336 {
 337         atomic_type_kind_t  kind = type->akind;
 338         ir_mode            *mode = atomic_modes[kind];
 339         ident              *id   = get_mode_ident(mode);
 340
 341         (void) id;
 342
 343         /* FIXME: finish the array */
 344         return NULL;
 345 }
 346
 347 /**
 348  * Creates a Firm type for an imaginary type
 349  */
 350 static ir_type *create_imaginary_type(const imaginary_type_t *type)
 351 {
 352         atomic_type_kind_t  kind      = type->akind;
 353         ir_mode            *mode      = atomic_modes[kind];
 354         ident              *id        = get_mode_ident(mode);
 355         ir_type            *irtype    = new_type_primitive(id, mode);
 356
 357         set_type_alignment_bytes(irtype, type->base.alignment);
 358
 359         return irtype;
 360 }
 361
 362 /**
 363  * return type of a parameter (and take transparent union gnu extension into
 364  * account)
 365  */
 366 static type_t *get_parameter_type(type_t *type)
 367 {
 368         type = skip_typeref(type);
 369         if (type->base.modifiers & TYPE_MODIFIER_TRANSPARENT_UNION) {
 370                 compound_t *compound = type->compound.compound;
 371                 type                 = compound->members.entities->declaration.type;
 372         }
 373
 374         return type;
 375 }
 376
 377 static ir_type *create_method_type(const function_type_t *function_type)
 378 {
 379         type_t  *return_type  = skip_typeref(function_type->return_type);
 380
 381         ident   *id           = id_unique("functiontype.%u");
 382         int      n_parameters = count_parameters(function_type);
 383         int      n_results    = return_type == type_void ? 0 : 1;
 384         ir_type *irtype       = new_type_method(id, n_parameters, n_results);
 385
 386         if (return_type != type_void) {
 387                 ir_type *restype = get_ir_type(return_type);
 388                 set_method_res_type(irtype, 0, restype);
 389         }
 390
 391         function_parameter_t *parameter = function_type->parameters;
 392         int                   n         = 0;
 393         for ( ; parameter != NULL; parameter = parameter->next) {
 394                 type_t  *type     = get_parameter_type(parameter->type);
 395                 ir_type *p_irtype = get_ir_type(type);
 396                 set_method_param_type(irtype, n, p_irtype);
 397                 ++n;
 398         }
 399
 400         if (function_type->variadic || function_type->unspecified_parameters) {
 401                 set_method_variadicity(irtype, variadicity_variadic);
 402         }
 403
 404         unsigned cc = get_method_calling_convention(irtype);
 405         switch (function_type->calling_convention) {
 406         case CC_DEFAULT: /* unspecified calling convention, equal to one of the other, typically cdecl */
 407         case CC_CDECL:
 408 is_cdecl:
 409                 set_method_calling_convention(irtype, SET_CDECL(cc));
 410                 break;
 411
 412         case CC_STDCALL:
 413                 if (function_type->variadic || function_type->unspecified_parameters)
 414                         goto is_cdecl;
 415
 416                 /* only non-variadic function can use stdcall, else use cdecl */
 417                 set_method_calling_convention(irtype, SET_STDCALL(cc));
 418                 break;
 419
 420         case CC_FASTCALL:
 421                 if (function_type->variadic || function_type->unspecified_parameters)
 422                         goto is_cdecl;
 423                 /* only non-variadic function can use fastcall, else use cdecl */
 424                 set_method_calling_convention(irtype, SET_FASTCALL(cc));
 425                 break;
 426
 427         case CC_THISCALL:
 428                 /* Hmm, leave default, not accepted by the parser yet. */
 429                 break;
 430         }
 431
 432         return irtype;
 433 }
 434
 435 static ir_type *create_pointer_type(pointer_type_t *type)
 436 {
 437         type_t   *points_to    = type->points_to;
 438         ir_type  *ir_points_to = get_ir_type_incomplete(points_to);
 439         ir_type  *ir_type      = new_type_pointer(id_unique("pointer.%u"),
 440                                                   ir_points_to, mode_P_data);
 441
 442         return ir_type;
 443 }
 444
 445 static ir_type *create_reference_type(reference_type_t *type)
 446 {
 447         type_t  *refers_to    = type->refers_to;
 448         ir_type *ir_refers_to = get_ir_type_incomplete(refers_to);
 449         ir_type *ir_type      = new_type_pointer(id_unique("reference.%u"),
 450                                                  ir_refers_to, mode_P_data);
 451
 452         return ir_type;
 453 }
 454
 455 static ir_type *create_array_type(array_type_t *type)
 456 {
 457         type_t  *element_type    = type->element_type;
 458         ir_type *ir_element_type = get_ir_type(element_type);
 459
 460         ident    *id      = id_unique("array.%u");
 461         ir_type  *ir_type = new_type_array(id, 1, ir_element_type);
 462
 463         const int align = get_type_alignment_bytes(ir_element_type);
 464         set_type_alignment_bytes(ir_type, align);
 465
 466         if (type->size_constant) {
 467                 int n_elements = type->size;
 468
 469                 set_array_bounds_int(ir_type, 0, 0, n_elements);
 470
 471                 size_t elemsize = get_type_size_bytes(ir_element_type);
 472                 if (elemsize % align > 0) {
 473                         elemsize += align - (elemsize % align);
 474                 }
 475                 set_type_size_bytes(ir_type, n_elements * elemsize);
 476         } else {
 477                 set_array_lower_bound_int(ir_type, 0, 0);
 478         }
 479         set_type_state(ir_type, layout_fixed);
 480
 481         return ir_type;
 482 }
 483
 484 /**
 485  * Return the signed integer type of size bits.
 486  *
 487  * @param size   the size
 488  */
 489 static ir_type *get_signed_int_type_for_bit_size(ir_type *base_tp,
 490                                                  unsigned size)
 491 {
 492         static ir_mode *s_modes[64 + 1] = {NULL, };
 493         ir_type *res;
 494         ir_mode *mode;
 495
 496         if (size <= 0 || size > 64)
 497                 return NULL;
 498
 499         mode = s_modes[size];
 500         if (mode == NULL) {
 501                 char name[32];
 502
 503                 snprintf(name, sizeof(name), "bf_I%u", size);
 504                 mode = new_ir_mode(name, irms_int_number, size, 1, irma_twos_complement,
 505                                    size <= 32 ? 32 : size );
 506                 s_modes[size] = mode;
 507         }
 508
 509         char name[32];
 510         snprintf(name, sizeof(name), "I%u", size);
 511         ident *id = new_id_from_str(name);
 512         dbg_info *dbgi = get_dbg_info(&builtin_source_position);
 513         res = new_d_type_primitive(id_mangle_u(get_type_ident(base_tp), id), mode, dbgi);
 514         set_primitive_base_type(res, base_tp);
 515
 516         return res;
 517 }
 518
 519 /**
 520  * Return the unsigned integer type of size bits.
 521  *
 522  * @param size   the size
 523  */
 524 static ir_type *get_unsigned_int_type_for_bit_size(ir_type *base_tp,
 525                                                    unsigned size)
 526 {
 527         static ir_mode *u_modes[64 + 1] = {NULL, };
 528         ir_type *res;
 529         ir_mode *mode;
 530
 531         if (size <= 0 || size > 64)
 532                 return NULL;
 533
 534         mode = u_modes[size];
 535         if (mode == NULL) {
 536                 char name[32];
 537
 538                 snprintf(name, sizeof(name), "bf_U%u", size);
 539                 mode = new_ir_mode(name, irms_int_number, size, 0, irma_twos_complement,
 540                                    size <= 32 ? 32 : size );
 541                 u_modes[size] = mode;
 542         }
 543
 544         char name[32];
 545
 546         snprintf(name, sizeof(name), "U%u", size);
 547         ident *id = new_id_from_str(name);
 548         dbg_info *dbgi = get_dbg_info(&builtin_source_position);
 549         res = new_d_type_primitive(id_mangle_u(get_type_ident(base_tp), id), mode, dbgi);
 550         set_primitive_base_type(res, base_tp);
 551
 552         return res;
 553 }
 554
 555 static ir_type *create_bitfield_type(bitfield_type_t *const type)
 556 {
 557         type_t *base = skip_typeref(type->base_type);
 558         assert(base->kind == TYPE_ATOMIC || base->kind == TYPE_ENUM);
 559         ir_type *irbase = get_ir_type(base);
 560
 561         unsigned size = type->bit_size;
 562
 563         assert(!is_type_float(base));
 564         if (is_type_signed(base)) {
 565                 return get_signed_int_type_for_bit_size(irbase, size);
 566         } else {
 567                 return get_unsigned_int_type_for_bit_size(irbase, size);
 568         }
 569 }
 570
 571 #define INVALID_TYPE ((ir_type_ptr)-1)
 572
 573 enum {
 574         COMPOUND_IS_STRUCT = false,
 575         COMPOUND_IS_UNION  = true
 576 };
 577
 578 /**
 579  * Construct firm type from ast struct type.
 580  *
 581  * As anonymous inner structs get flattened to a single firm type, we might get
 582  * irtype, outer_offset and out_align passed (they represent the position of
 583  * the anonymous inner struct inside the resulting firm struct)
 584  */
 585 static ir_type *create_compound_type(compound_type_t *type, ir_type *irtype,
 586                                      size_t *outer_offset, size_t *outer_align,
 587                                      bool incomplete, bool is_union)
 588 {
 589         compound_t *compound = type->compound;
 590
 591         if (compound->irtype != NULL && (compound->irtype_complete || incomplete)) {
 592                 return compound->irtype;
 593         }
 594
 595         size_t align_all  = 1;
 596         size_t offset     = 0;
 597         size_t bit_offset = 0;
 598         size_t size       = 0;
 599
 600         if (irtype == NULL) {
 601                 symbol_t *symbol = compound->base.symbol;
 602                 ident    *id;
 603                 if (symbol != NULL) {
 604                         id = new_id_from_str(symbol->string);
 605                 } else {
 606                         if (is_union) {
 607                                 id = id_unique("__anonymous_union.%u");
 608                         } else {
 609                                 id = id_unique("__anonymous_struct.%u");
 610                         }
 611                 }
 612                 dbg_info *dbgi = get_dbg_info(&compound->base.source_position);
 613
 614                 if (is_union) {
 615                         irtype = new_d_type_union(id, dbgi);
 616                 } else {
 617                         irtype = new_d_type_struct(id, dbgi);
 618                 }
 619
 620                 compound->irtype_complete = false;
 621                 compound->irtype          = irtype;
 622         } else {
 623                 offset    = *outer_offset;
 624                 align_all = *outer_align;
 625         }
 626
 627         if (incomplete)
 628                 return irtype;
 629
 630         compound->irtype_complete = true;
 631
 632         entity_t *entry = compound->members.entities;
 633         for ( ; entry != NULL; entry = entry->base.next) {
 634                 if (entry->kind != ENTITY_COMPOUND_MEMBER)
 635                         continue;
 636
 637                 size_t prev_offset = offset;
 638
 639                 symbol_t *symbol     = entry->base.symbol;
 640                 type_t   *entry_type = skip_typeref(entry->declaration.type);
 641                 dbg_info *dbgi       = get_dbg_info(&entry->base.source_position);
 642
 643                 ident    *ident;
 644                 if (symbol != NULL) {
 645                         ident = new_id_from_str(symbol->string);
 646                 } else {
 647                         if (entry_type->kind == TYPE_COMPOUND_STRUCT) {
 648                                 create_compound_type(&entry_type->compound, irtype, &offset,
 649                                                      &align_all, false, COMPOUND_IS_STRUCT);
 650                                 goto finished_member;
 651                         } else if (entry_type->kind == TYPE_COMPOUND_UNION) {
 652                                 create_compound_type(&entry_type->compound, irtype, &offset,
 653                                                      &align_all, false, COMPOUND_IS_UNION);
 654                                 goto finished_member;
 655                         } else {
 656                                 assert(entry_type->kind == TYPE_BITFIELD);
 657                         }
 658                         ident = id_unique("anon.%u");
 659                 }
 660
 661                 ir_type *base_irtype;
 662                 if (entry_type->kind == TYPE_BITFIELD) {
 663                         base_irtype = get_ir_type(entry_type->bitfield.base_type);
 664                 } else {
 665                         base_irtype = get_ir_type(entry_type);
 666                 }
 667
 668                 size_t entry_alignment = get_type_alignment_bytes(base_irtype);
 669                 size_t misalign        = offset % entry_alignment;
 670
 671                 ir_type   *entry_irtype = get_ir_type(entry_type);
 672                 ir_entity *entity = new_d_entity(irtype, ident, entry_irtype, dbgi);
 673
 674                 size_t base;
 675                 size_t bits_remainder;
 676                 if (entry_type->kind == TYPE_BITFIELD) {
 677                         size_t size_bits      = entry_type->bitfield.bit_size;
 678                         size_t rest_size_bits = (entry_alignment - misalign)*8 - bit_offset;
 679
 680                         if (size_bits > rest_size_bits) {
 681                                 /* start a new bucket */
 682                                 offset     += entry_alignment - misalign;
 683                                 bit_offset  = 0;
 684
 685                                 base           = offset;
 686                                 bits_remainder = 0;
 687                         } else {
 688                                 /* put into current bucket */
 689                                 base           = offset - misalign;
 690                                 bits_remainder = misalign * 8 + bit_offset;
 691                         }
 692
 693                         offset     += size_bits / 8;
 694                         bit_offset  = bit_offset + (size_bits % 8);
 695                 } else {
 696                         size_t entry_size = get_type_size_bytes(base_irtype);
 697                         if (misalign > 0 || bit_offset > 0)
 698                                 offset += entry_alignment - misalign;
 699
 700                         base           = offset;
 701                         bits_remainder = 0;
 702                         offset        += entry_size;
 703                         bit_offset     = 0;
 704                 }
 705
 706                 if (entry_alignment > align_all) {
 707                         if (entry_alignment % align_all != 0) {
 708                                 panic("uneven alignments not supported yet");
 709                         }
 710                         align_all = entry_alignment;
 711                 }
 712
 713                 set_entity_offset(entity, base);
 714                 set_entity_offset_bits_remainder(entity,
 715                                                  (unsigned char) bits_remainder);
 716                 //add_struct_member(irtype, entity);
 717                 entry->declaration.kind = DECLARATION_KIND_COMPOUND_MEMBER;
 718                 assert(entry->compound_member.entity == NULL);
 719                 entry->compound_member.entity = entity;
 720
 721 finished_member:
 722                 if (is_union) {
 723                         size_t entry_size = offset - prev_offset;
 724                         if (entry_size > size) {
 725                                 size = entry_size;
 726                         }
 727                         offset     = 0;
 728                         bit_offset = 0;
 729                 }
 730         }
 731
 732         if (!is_union) {
 733                 size = offset;
 734         }
 735
 736         size_t misalign = offset % align_all;
 737         if (misalign > 0 || bit_offset > 0) {
 738                 size += align_all - misalign;
 739         }
 740
 741         if (outer_offset != NULL) {
 742                 if (!is_union) {
 743                         *outer_offset = offset;
 744                 } else {
 745                         *outer_offset += size;
 746                 }
 747
 748                 if (align_all > *outer_align) {
 749                         if (align_all % *outer_align != 0) {
 750                                 panic("uneven alignments not supported yet");
 751                         }
 752                         *outer_align = align_all;
 753                 }
 754         } else {
 755                 set_type_alignment_bytes(irtype, align_all);
 756                 set_type_size_bytes(irtype, size);
 757                 set_type_state(irtype, layout_fixed);
 758         }
 759
 760         return irtype;
 761 }
 762
 763 static ir_type *create_enum_type(enum_type_t *const type)
 764 {
 765         type->base.firm_type = ir_type_int;
 766
 767         ir_mode *const mode    = mode_int;
 768         tarval  *const one     = get_mode_one(mode);
 769         tarval  *      tv_next = get_tarval_null(mode);
 770
 771         bool constant_folding_old = constant_folding;
 772         constant_folding = true;
 773
 774         enum_t   *enume = type->enume;
 775         entity_t *entry = enume->base.next;
 776         for (; entry != NULL; entry = entry->base.next) {
 777                 if (entry->kind != ENTITY_ENUM_VALUE)
 778                         break;
 779
 780                 expression_t *const init = entry->enum_value.value;
 781                 if (init != NULL) {
 782                         ir_node *const cnst = expression_to_firm(init);
 783                         if (!is_Const(cnst)) {
 784                                 panic("couldn't fold constant");
 785                         }
 786                         tv_next = get_Const_tarval(cnst);
 787                 }
 788                 entry->enum_value.tv = tv_next;
 789                 tv_next = tarval_add(tv_next, one);
 790         }
 791
 792         constant_folding = constant_folding_old;
 793
 794         return ir_type_int;
 795 }
 796
 797 static ir_type *get_ir_type_incomplete(type_t *type)
 798 {
 799         assert(type != NULL);
 800         type = skip_typeref(type);
 801
 802         if (type->base.firm_type != NULL) {
 803                 assert(type->base.firm_type != INVALID_TYPE);
 804                 return type->base.firm_type;
 805         }
 806
 807         switch (type->kind) {
 808         case TYPE_COMPOUND_STRUCT:
 809                 return create_compound_type(&type->compound, NULL, NULL, NULL,
 810                                             true, COMPOUND_IS_STRUCT);
 811         case TYPE_COMPOUND_UNION:
 812                 return create_compound_type(&type->compound, NULL, NULL, NULL,
 813                                             true, COMPOUND_IS_UNION);
 814         default:
 815                 return get_ir_type(type);
 816         }
 817 }
 818
 819 ir_type *get_ir_type(type_t *type)
 820 {
 821         assert(type != NULL);
 822
 823         type = skip_typeref(type);
 824
 825         if (type->base.firm_type != NULL) {
 826                 assert(type->base.firm_type != INVALID_TYPE);
 827                 return type->base.firm_type;
 828         }
 829
 830         ir_type *firm_type = NULL;
 831         switch (type->kind) {
 832         case TYPE_ERROR:
 833                 /* Happens while constant folding, when there was an error */
 834                 return create_atomic_type(&type_void->atomic);
 835
 836         case TYPE_ATOMIC:
 837                 firm_type = create_atomic_type(&type->atomic);
 838                 break;
 839         case TYPE_COMPLEX:
 840                 firm_type = create_complex_type(&type->complex);
 841                 break;
 842         case TYPE_IMAGINARY:
 843                 firm_type = create_imaginary_type(&type->imaginary);
 844                 break;
 845         case TYPE_FUNCTION:
 846                 firm_type = create_method_type(&type->function);
 847                 break;
 848         case TYPE_POINTER:
 849                 firm_type = create_pointer_type(&type->pointer);
 850                 break;
 851         case TYPE_REFERENCE:
 852                 firm_type = create_reference_type(&type->reference);
 853                 break;
 854         case TYPE_ARRAY:
 855                 firm_type = create_array_type(&type->array);
 856                 break;
 857         case TYPE_COMPOUND_STRUCT:
 858                 firm_type = create_compound_type(&type->compound, NULL, NULL, NULL,
 859                                                  false, COMPOUND_IS_STRUCT);
 860                 break;
 861         case TYPE_COMPOUND_UNION:
 862                 firm_type = create_compound_type(&type->compound, NULL, NULL, NULL,
 863                                                  false, COMPOUND_IS_UNION);
 864                 break;
 865         case TYPE_ENUM:
 866                 firm_type = create_enum_type(&type->enumt);
 867                 break;
 868         case TYPE_BUILTIN:
 869                 firm_type = get_ir_type(type->builtin.real_type);
 870                 break;
 871         case TYPE_BITFIELD:
 872                 firm_type = create_bitfield_type(&type->bitfield);
 873                 break;
 874
 875         case TYPE_TYPEOF:
 876         case TYPE_TYPEDEF:
 877         case TYPE_INVALID:
 878                 break;
 879         }
 880         if (firm_type == NULL)
 881                 panic("unknown type found");
 882
 883         type->base.firm_type = firm_type;
 884         return firm_type;
 885 }
 886
 887 ir_mode *get_ir_mode(type_t *type)
 888 {
 889         ir_type *irtype = get_ir_type(type);
 890
 891         /* firm doesn't report a mode for arrays somehow... */
 892         if (is_Array_type(irtype)) {
 893                 return mode_P_data;
 894         }
 895
 896         ir_mode *mode = get_type_mode(irtype);
 897         assert(mode != NULL);
 898         return mode;
 899 }
 900
 901 /** Names of the runtime functions. */
 902 static const struct {
 903         int        id;           /**< the rts id */
 904         int        n_res;        /**< number of return values */
 905         const char *name;        /**< the name of the rts function */
 906         int        n_params;     /**< number of parameters */
 907         unsigned   flags;        /**< language flags */
 908 } rts_data[] = {
 909         { rts_debugbreak, 0, "__debugbreak", 0, _MS },
 910         { rts_abort,      0, "abort",        0, _C89 },
 911         { rts_alloca,     1, "alloca",       1, _ALL },
 912         { rts_abs,        1, "abs",          1, _C89 },
 913         { rts_labs,       1, "labs",         1, _C89 },
 914         { rts_llabs,      1, "llabs",        1, _C99 },
 915         { rts_imaxabs,    1, "imaxabs",      1, _C99 },
 916
 917         { rts_fabs,       1, "fabs",         1, _C89 },
 918         { rts_sqrt,       1, "sqrt",         1, _C89 },
 919         { rts_cbrt,       1, "cbrt",         1, _C99 },
 920         { rts_exp,        1, "exp",          1, _C89 },
 921         { rts_exp2,       1, "exp2",         1, _C89 },
 922         { rts_exp10,      1, "exp10",        1, _GNUC },
 923         { rts_log,        1, "log",          1, _C89 },
 924         { rts_log2,       1, "log2",         1, _C89 },
 925         { rts_log10,      1, "log10",        1, _C89 },
 926         { rts_pow,        1, "pow",          2, _C89 },
 927         { rts_sin,        1, "sin",          1, _C89 },
 928         { rts_cos,        1, "cos",          1, _C89 },
 929         { rts_tan,        1, "tan",          1, _C89 },
 930         { rts_asin,       1, "asin",         1, _C89 },
 931         { rts_acos,       1, "acos",         1, _C89 },
 932         { rts_atan,       1, "atan",         1, _C89 },
 933         { rts_sinh,       1, "sinh",         1, _C89 },
 934         { rts_cosh,       1, "cosh",         1, _C89 },
 935         { rts_tanh,       1, "tanh",         1, _C89 },
 936
 937         { rts_fabsf,      1, "fabsf",        1, _C99 },
 938         { rts_sqrtf,      1, "sqrtf",        1, _C99 },
 939         { rts_cbrtf,      1, "cbrtf",        1, _C99 },
 940         { rts_expf,       1, "expf",         1, _C99 },
 941         { rts_exp2f,      1, "exp2f",        1, _C99 },
 942         { rts_exp10f,     1, "exp10f",       1, _GNUC },
 943         { rts_logf,       1, "logf",         1, _C99 },
 944         { rts_log2f,      1, "log2f",        1, _C99 },
 945         { rts_log10f,     1, "log10f",       1, _C99 },
 946         { rts_powf,       1, "powf",         2, _C99 },
 947         { rts_sinf,       1, "sinf",         1, _C99 },
 948         { rts_cosf,       1, "cosf",         1, _C99 },
 949         { rts_tanf,       1, "tanf",         1, _C99 },
 950         { rts_asinf,      1, "asinf",        1, _C99 },
 951         { rts_acosf,      1, "acosf",        1, _C99 },
 952         { rts_atanf,      1, "atanf",        1, _C99 },
 953         { rts_sinhf,      1, "sinhf",        1, _C99 },
 954         { rts_coshf,      1, "coshf",        1, _C99 },
 955         { rts_tanhf,      1, "tanhf",        1, _C99 },
 956
 957         { rts_fabsl,      1, "fabsl",        1, _C99 },
 958         { rts_sqrtl,      1, "sqrtl",        1, _C99 },
 959         { rts_cbrtl,      1, "cbrtl",        1, _C99 },
 960         { rts_expl,       1, "expl",         1, _C99 },
 961         { rts_exp2l,      1, "exp2l",        1, _C99 },
 962         { rts_exp10l,     1, "exp10l",       1, _GNUC },
 963         { rts_logl,       1, "logl",         1, _C99 },
 964         { rts_log2l,      1, "log2l",        1, _C99 },
 965         { rts_log10l,     1, "log10l",       1, _C99 },
 966         { rts_powl,       1, "powl",         2, _C99 },
 967         { rts_sinl,       1, "sinl",         1, _C99 },
 968         { rts_cosl,       1, "cosl",         1, _C99 },
 969         { rts_tanl,       1, "tanl",         1, _C99 },
 970         { rts_asinl,      1, "asinl",        1, _C99 },
 971         { rts_acosl,      1, "acosl",        1, _C99 },
 972         { rts_atanl,      1, "atanl",        1, _C99 },
 973         { rts_sinhl,      1, "sinhl",        1, _C99 },
 974         { rts_coshl,      1, "coshl",        1, _C99 },
 975         { rts_tanhl,      1, "tanhl",        1, _C99 },
 976
 977         { rts_memcpy,     1, "memcpy",       3, _C89 },  /* HMM, man say its C99 */
 978         { rts_memset,     1, "memset",       3, _C89 },  /* HMM, man say its C99 */
 979         { rts_strcmp,     1, "strcmp",       2, _C89 },
 980         { rts_strncmp,    1, "strncmp",      3, _C89 }
 981 };
 982
 983 static ident *rts_idents[sizeof(rts_data) / sizeof(rts_data[0])];
 984
 985 static ident* (*create_ld_ident)(entity_t*) = create_name_linux_elf;
 986
 987 /**
 988  * Handle GNU attributes for entities
 989  *
 990  * @param ent   the entity
 991  * @param decl  the routine declaration
 992  */
 993 static void handle_gnu_attributes_ent(ir_entity *irentity, entity_t *entity)
 994 {
 995         assert(is_declaration(entity));
 996         decl_modifiers_t modifiers = entity->declaration.modifiers;
 997         if (modifiers & DM_PURE) {
 998                 /* TRUE if the declaration includes the GNU
 999                    __attribute__((pure)) specifier. */
1000                 set_entity_additional_property(irentity, mtp_property_pure);
1001         }
1002         if (modifiers & DM_CONST) {
1003                 set_entity_additional_property(irentity, mtp_property_const);
1004                 have_const_functions = true;
1005         }
1006         if (modifiers & DM_USED) {
1007                 /* TRUE if the declaration includes the GNU
1008                    __attribute__((used)) specifier. */
1009                 set_entity_stickyness(irentity, stickyness_sticky);
1010         }
1011 }
1012
1013 static bool is_main(entity_t *entity)
1014 {
1015         static symbol_t *sym_main = NULL;
1016         if (sym_main == NULL) {
1017                 sym_main = symbol_table_insert("main");
1018         }
1019
1020         if (entity->base.symbol != sym_main)
1021                 return false;
1022         /* must be in outermost scope */
1023         if (entity->base.parent_scope != &current_translation_unit->scope)
1024                 return false;
1025
1026         return true;
1027 }
1028
1029 /**
1030  * Creates an entity representing a function.
1031  *
1032  * @param declaration  the function declaration
1033  */
1034 static ir_entity *get_function_entity(entity_t *entity)
1035 {
1036         assert(entity->kind == ENTITY_FUNCTION);
1037         if (entity->function.entity != NULL) {
1038                 return entity->function.entity;
1039         }
1040
1041         if (is_main(entity)) {
1042                 /* force main to C linkage */
1043                 type_t *type = entity->declaration.type;
1044                 assert(is_type_function(type));
1045                 if (type->function.linkage != LINKAGE_C) {
1046                         type_t *new_type           = duplicate_type(type);
1047                         new_type->function.linkage = LINKAGE_C;
1048
1049                         type = typehash_insert(new_type);
1050                         if (type != new_type) {
1051                                 obstack_free(type_obst, new_type);
1052                         }
1053                         entity->declaration.type = type;
1054                 }
1055         }
1056
1057         symbol_t *symbol = entity->base.symbol;
1058         ident    *id     = new_id_from_str(symbol->string);
1059
1060         ir_type   *global_type    = get_glob_type();
1061         ir_type   *ir_type_method = get_ir_type(entity->declaration.type);
1062         bool const has_body       = entity->function.statement != NULL;
1063
1064         /* already an entity defined? */
1065         ir_entity *irentity = entitymap_get(&entitymap, symbol);
1066         if (irentity != NULL) {
1067                 if (get_entity_visibility(irentity) == visibility_external_allocated
1068                                 && has_body) {
1069                         set_entity_visibility(irentity, visibility_external_visible);
1070                 }
1071                 goto entity_created;
1072         }
1073
1074         dbg_info *const dbgi = get_dbg_info(&entity->base.source_position);
1075         irentity             = new_d_entity(global_type, id, ir_type_method, dbgi);
1076         set_entity_ld_ident(irentity, create_ld_ident(entity));
1077
1078         handle_gnu_attributes_ent(irentity, entity);
1079
1080         /* static inline             => local
1081          * extern inline             => local
1082          * inline without definition => local
1083          * inline with definition    => external_visible */
1084         storage_class_tag_t const storage_class
1085                 = (storage_class_tag_t) entity->declaration.storage_class;
1086         bool                const is_inline     = entity->function.is_inline;
1087         if (is_inline && storage_class == STORAGE_CLASS_NONE && has_body) {
1088                 set_entity_visibility(irentity, visibility_external_visible);
1089         } else if (storage_class == STORAGE_CLASS_STATIC ||
1090                    (is_inline && has_body)) {
1091                 if (!has_body) {
1092                         /* this entity was declared, but is defined nowhere */
1093                         set_entity_peculiarity(irentity, peculiarity_description);
1094                 }
1095                 set_entity_visibility(irentity, visibility_local);
1096         } else if (has_body) {
1097                 set_entity_visibility(irentity, visibility_external_visible);
1098         } else {
1099                 set_entity_visibility(irentity, visibility_external_allocated);
1100         }
1101         set_entity_allocation(irentity, allocation_static);
1102
1103         /* We should check for file scope here, but as long as we compile C only
1104            this is not needed. */
1105         if (! firm_opt.freestanding) {
1106                 /* check for a known runtime function */
1107                 for (size_t i = 0; i < sizeof(rts_data) / sizeof(rts_data[0]); ++i) {
1108                         if (id != rts_idents[i])
1109                                 continue;
1110
1111                         /* ignore those rts functions not necessary needed for current mode */
1112                         if ((c_mode & rts_data[i].flags) == 0)
1113                                 continue;
1114                         assert(rts_entities[rts_data[i].id] == NULL);
1115                         rts_entities[rts_data[i].id] = irentity;
1116                 }
1117         }
1118
1119         entitymap_insert(&entitymap, symbol, irentity);
1120
1121 entity_created:
1122         entity->declaration.kind = DECLARATION_KIND_FUNCTION;
1123         entity->function.entity  = irentity;
1124
1125         return irentity;
1126 }
1127
1128 /**
1129  * Creates a Const node representing a constant.
1130  */
1131 static ir_node *const_to_firm(const const_expression_t *cnst)
1132 {
1133         dbg_info *dbgi = get_dbg_info(&cnst->base.source_position);
1134         ir_mode  *mode = get_ir_mode(cnst->base.type);
1135
1136         char    buf[128];
1137         tarval *tv;
1138         size_t  len;
1139         if (mode_is_float(mode)) {
1140                 tv = new_tarval_from_double(cnst->v.float_value, mode);
1141         } else {
1142                 if (mode_is_signed(mode)) {
1143                         len = snprintf(buf, sizeof(buf), "%lld", cnst->v.int_value);
1144                 } else {
1145                         len = snprintf(buf, sizeof(buf), "%llu",
1146                                        (unsigned long long) cnst->v.int_value);
1147                 }
1148                 tv = new_tarval_from_str(buf, len, mode);
1149         }
1150
1151         return new_d_Const(dbgi, tv);
1152 }
1153
1154 /**
1155  * Creates a Const node representing a character constant.
1156  */
1157 static ir_node *character_constant_to_firm(const const_expression_t *cnst)
1158 {
1159         dbg_info *dbgi = get_dbg_info(&cnst->base.source_position);
1160         ir_mode  *mode = get_ir_mode(cnst->base.type);
1161
1162         long long int v = 0;
1163         for (size_t i = 0; i < cnst->v.character.size; ++i) {
1164                 if (char_is_signed) {
1165                         v = (v << 8) | ((signed char)cnst->v.character.begin[i]);
1166                 } else {
1167                         v = (v << 8) | ((unsigned char)cnst->v.character.begin[i]);
1168                 }
1169         }
1170         char    buf[128];
1171         size_t  len = snprintf(buf, sizeof(buf), "%lld", v);
1172         tarval *tv = new_tarval_from_str(buf, len, mode);
1173
1174         return new_d_Const(dbgi, tv);
1175 }
1176
1177 /**
1178  * Creates a Const node representing a wide character constant.
1179  */
1180 static ir_node *wide_character_constant_to_firm(const const_expression_t *cnst)
1181 {
1182         dbg_info *dbgi = get_dbg_info(&cnst->base.source_position);
1183         ir_mode  *mode = get_ir_mode(cnst->base.type);
1184
1185         long long int v = cnst->v.wide_character.begin[0];
1186
1187         char    buf[128];
1188         size_t  len = snprintf(buf, sizeof(buf), "%lld", v);
1189         tarval *tv = new_tarval_from_str(buf, len, mode);
1190
1191         return new_d_Const(dbgi, tv);
1192 }
1193
1194 /**
1195  * Creates a SymConst for a given entity.
1196  *
1197  * @param dbgi    debug info
1198  * @param mode    the (reference) mode for the SymConst
1199  * @param entity  the entity
1200  */
1201 static ir_node *create_symconst(dbg_info *dbgi, ir_mode *mode,
1202                               ir_entity *entity)
1203 {
1204         assert(entity != NULL);
1205         union symconst_symbol sym;
1206         sym.entity_p = entity;
1207         return new_d_SymConst(dbgi, mode, sym, symconst_addr_ent);
1208 }
1209
1210 /**
1211  * Creates a SymConst node representing a string constant.
1212  *
1213  * @param src_pos    the source position of the string constant
1214  * @param id_prefix  a prefix for the name of the generated string constant
1215  * @param value      the value of the string constant
1216  */
1217 static ir_node *string_to_firm(const source_position_t *const src_pos,
1218                                const char *const id_prefix,
1219                                const string_t *const value)
1220 {
1221         ir_type  *const global_type = get_glob_type();
1222         dbg_info *const dbgi        = get_dbg_info(src_pos);
1223         ir_type  *const type        = new_d_type_array(id_unique("strtype.%u"), 1,
1224                                                        ir_type_const_char, dbgi);
1225
1226         ident     *const id     = id_unique(id_prefix);
1227         ir_entity *const entity = new_d_entity(global_type, id, type, dbgi);
1228         set_entity_ld_ident(entity, id);
1229         set_entity_variability(entity, variability_constant);
1230         set_entity_allocation(entity, allocation_static);
1231
1232         ir_type *const elem_type = ir_type_const_char;
1233         ir_mode *const mode      = get_type_mode(elem_type);
1234
1235         const char* const string = value->begin;
1236         const size_t      slen   = value->size;
1237
1238         set_array_lower_bound_int(type, 0, 0);
1239         set_array_upper_bound_int(type, 0, slen);
1240         set_type_size_bytes(type, slen);
1241         set_type_state(type, layout_fixed);
1242
1243         tarval **const tvs = xmalloc(slen * sizeof(tvs[0]));
1244         for (size_t i = 0; i < slen; ++i) {
1245                 tvs[i] = new_tarval_from_long(string[i], mode);
1246         }
1247
1248         set_array_entity_values(entity, tvs, slen);
1249         free(tvs);
1250
1251         return create_symconst(dbgi, mode_P_data, entity);
1252 }
1253
1254 /**
1255  * Creates a SymConst node representing a string literal.
1256  *
1257  * @param literal   the string literal
1258  */
1259 static ir_node *string_literal_to_firm(
1260                 const string_literal_expression_t* literal)
1261 {
1262         return string_to_firm(&literal->base.source_position, "Lstr.%u",
1263                               &literal->value);
1264 }
1265
1266 /**
1267  * Creates a SymConst node representing a wide string literal.
1268  *
1269  * @param literal   the wide string literal
1270  */
1271 static ir_node *wide_string_literal_to_firm(
1272         const wide_string_literal_expression_t* const literal)
1273 {
1274         ir_type *const global_type = get_glob_type();
1275         ir_type *const elem_type   = ir_type_wchar_t;
1276         dbg_info *const dbgi       = get_dbg_info(&literal->base.source_position);
1277         ir_type *const type        = new_d_type_array(id_unique("strtype.%u"), 1,
1278                                                     elem_type, dbgi);
1279
1280         ident     *const id     = id_unique("Lstr.%u");
1281         ir_entity *const entity = new_d_entity(global_type, id, type, dbgi);
1282         set_entity_ld_ident(entity, id);
1283         set_entity_variability(entity, variability_constant);
1284         set_entity_allocation(entity, allocation_static);
1285
1286         ir_mode *const mode      = get_type_mode(elem_type);
1287
1288         const wchar_rep_t *const string = literal->value.begin;
1289         const size_t             slen   = literal->value.size;
1290
1291         set_array_lower_bound_int(type, 0, 0);
1292         set_array_upper_bound_int(type, 0, slen);
1293         set_type_size_bytes(type, slen);
1294         set_type_state(type, layout_fixed);
1295
1296         tarval **const tvs = xmalloc(slen * sizeof(tvs[0]));
1297         for (size_t i = 0; i < slen; ++i) {
1298                 tvs[i] = new_tarval_from_long(string[i], mode);
1299         }
1300
1301         set_array_entity_values(entity, tvs, slen);
1302         free(tvs);
1303
1304         return create_symconst(dbgi, mode_P_data, entity);
1305 }
1306
1307 static ir_node *deref_address(dbg_info *const dbgi, type_t *const type,
1308                                       ir_node *const addr)
1309 {
1310         ir_type *irtype = get_ir_type(type);
1311         if (is_compound_type(irtype)
1312                         || is_Method_type(irtype)
1313                         || is_Array_type(irtype)) {
1314                 return addr;
1315         }
1316
1317         ir_mode *const mode     = get_type_mode(irtype);
1318         ir_node *const memory   = get_store();
1319         ir_node *const load     = new_d_Load(dbgi, memory, addr, mode);
1320         ir_node *const load_mem = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1321         ir_node *const load_res = new_d_Proj(dbgi, load, mode,   pn_Load_res);
1322
1323         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE && !is_Bad(load)) {
1324                 set_Load_volatility(load, volatility_is_volatile);
1325         }
1326
1327         set_store(load_mem);
1328         return load_res;
1329 }
1330
1331 /**
1332  * Creates a strict Conv if neccessary.
1333  */
1334 static ir_node *do_strict_conv(dbg_info *dbgi, ir_node *node)
1335 {
1336         ir_mode *mode = get_irn_mode(node);
1337
1338         if (!(get_irg_fp_model(current_ir_graph) & fp_explicit_rounding))
1339                 return node;
1340         if (!mode_is_float(mode))
1341                 return node;
1342
1343         /* check if there is already a Conv */
1344         if (is_Conv(node)) {
1345                 /* convert it into a strict Conv */
1346                 set_Conv_strict(node, 1);
1347                 return node;
1348         }
1349
1350         /* otherwise create a new one */
1351         return new_d_strictConv(dbgi, node, mode);
1352 }
1353
1354 static ir_node *get_global_var_address(dbg_info *const dbgi,
1355                                        const entity_t *const entity)
1356 {
1357         assert(entity->kind == ENTITY_VARIABLE);
1358         assert(entity->declaration.kind == DECLARATION_KIND_GLOBAL_VARIABLE);
1359
1360         ir_entity *const irentity = entity->variable.v.entity;
1361         if (entity->variable.thread_local) {
1362                 ir_node *const no_mem = new_NoMem();
1363                 ir_node *const tls    = get_irg_tls(current_ir_graph);
1364                 return new_d_simpleSel(dbgi, no_mem, tls, irentity);
1365         } else {
1366                 return create_symconst(dbgi, mode_P_data, irentity);
1367         }
1368 }
1369
1370 /**
1371  * Returns the correct base address depending on whether it is a parameter or a
1372  * normal local variable.
1373  */
1374 static ir_node *get_local_frame(ir_entity *const ent)
1375 {
1376         ir_graph      *const irg   = current_ir_graph;
1377         const ir_type *const owner = get_entity_owner(ent);
1378         if (owner == get_irg_frame_type(irg)) {
1379                 return get_irg_frame(irg);
1380         } else {
1381                 assert(owner == get_method_value_param_type(get_entity_type(get_irg_entity(irg))));
1382                 return get_irg_value_param_base(irg);
1383         }
1384 }
1385
1386 static ir_node *create_conv(dbg_info *dbgi, ir_node *value, ir_mode *dest_mode)
1387 {
1388         ir_mode *value_mode = get_irn_mode(value);
1389
1390         if (value_mode == dest_mode || is_Bad(value))
1391                 return value;
1392
1393         if (dest_mode == mode_b) {
1394                 ir_node *zero = new_Const(get_mode_null(value_mode));
1395                 ir_node *cmp  = new_d_Cmp(dbgi, value, zero);
1396                 ir_node *proj = new_d_Proj(dbgi, cmp, mode_b, pn_Cmp_Lg);
1397                 return proj;
1398         }
1399
1400         return new_d_Conv(dbgi, value, dest_mode);
1401 }
1402
1403 /**
1404  * Keep all memory edges of the given block.
1405  */
1406 static void keep_all_memory(ir_node *block) {
1407         ir_node *old = get_cur_block();
1408
1409         set_cur_block(block);
1410         keep_alive(get_store());
1411         /* TODO: keep all memory edges from restricted pointers */
1412         set_cur_block(old);
1413 }
1414
1415 static ir_node *reference_expression_enum_value_to_firm(
1416                 const reference_expression_t *ref)
1417 {
1418         entity_t *entity = ref->entity;
1419         type_t   *type   = skip_typeref(entity->enum_value.enum_type);
1420         /* make sure the type is constructed */
1421         (void) get_ir_type(type);
1422
1423         return new_Const(entity->enum_value.tv);
1424 }
1425
1426 static ir_node *reference_expression_to_firm(const reference_expression_t *ref)
1427 {
1428         dbg_info *dbgi   = get_dbg_info(&ref->base.source_position);
1429         entity_t *entity = ref->entity;
1430         assert(is_declaration(entity));
1431         type_t   *type   = skip_typeref(entity->declaration.type);
1432
1433         /* make sure the type is constructed */
1434         (void) get_ir_type(type);
1435
1436         switch ((declaration_kind_t) entity->declaration.kind) {
1437         case DECLARATION_KIND_UNKNOWN:
1438                 break;
1439
1440         case DECLARATION_KIND_LOCAL_VARIABLE: {
1441                 ir_mode *const mode = get_ir_mode(type);
1442                 return get_value(entity->variable.v.value_number, mode);
1443         }
1444         case DECLARATION_KIND_PARAMETER: {
1445                 ir_mode *const mode = get_ir_mode(type);
1446                 return get_value(entity->parameter.v.value_number, mode);
1447         }
1448         case DECLARATION_KIND_FUNCTION: {
1449                 ir_mode *const mode = get_ir_mode(type);
1450                 return create_symconst(dbgi, mode, entity->function.entity);
1451         }
1452         case DECLARATION_KIND_INNER_FUNCTION: {
1453                 ir_mode *const mode = get_ir_mode(type);
1454                 if (!entity->function.goto_to_outer && !entity->function.need_closure) {
1455                         /* inner function not using the closure */
1456                         return create_symconst(dbgi, mode, entity->function.entity);
1457                 } else {
1458                         /* TODO: need trampoline here */
1459                         panic("Trampoline code not implemented");
1460                         return create_symconst(dbgi, mode, entity->function.entity);
1461                 }
1462         }
1463         case DECLARATION_KIND_GLOBAL_VARIABLE: {
1464                 ir_node *const addr = get_global_var_address(dbgi, entity);
1465                 return deref_address(dbgi, entity->declaration.type, addr);
1466         }
1467
1468         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY: {
1469                 ir_entity *irentity = entity->variable.v.entity;
1470                 ir_node   *frame    = get_local_frame(irentity);
1471                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1472                 return deref_address(dbgi, entity->declaration.type, sel);
1473         }
1474         case DECLARATION_KIND_PARAMETER_ENTITY: {
1475                 ir_entity *irentity = entity->parameter.v.entity;
1476                 ir_node   *frame    = get_local_frame(irentity);
1477                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1478                 return deref_address(dbgi, entity->declaration.type, sel);
1479         }
1480
1481         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
1482                 return entity->variable.v.vla_base;
1483
1484         case DECLARATION_KIND_COMPOUND_MEMBER:
1485                 panic("not implemented reference type");
1486         }
1487
1488         panic("reference to declaration with unknown type found");
1489 }
1490
1491 static ir_node *reference_addr(const reference_expression_t *ref)
1492 {
1493         dbg_info *dbgi   = get_dbg_info(&ref->base.source_position);
1494         entity_t *entity = ref->entity;
1495         assert(is_declaration(entity));
1496
1497         switch((declaration_kind_t) entity->declaration.kind) {
1498         case DECLARATION_KIND_UNKNOWN:
1499                 break;
1500         case DECLARATION_KIND_PARAMETER:
1501         case DECLARATION_KIND_LOCAL_VARIABLE:
1502                 /* you can store to a local variable (so we don't panic but return NULL
1503                  * as an indicator for no real address) */
1504                 return NULL;
1505         case DECLARATION_KIND_GLOBAL_VARIABLE: {
1506                 ir_node *const addr = get_global_var_address(dbgi, entity);
1507                 return addr;
1508         }
1509         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY: {
1510                 ir_entity *irentity = entity->variable.v.entity;
1511                 ir_node   *frame    = get_local_frame(irentity);
1512                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1513
1514                 return sel;
1515         }
1516         case DECLARATION_KIND_PARAMETER_ENTITY: {
1517                 ir_entity *irentity = entity->parameter.v.entity;
1518                 ir_node   *frame    = get_local_frame(irentity);
1519                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1520
1521                 return sel;
1522         }
1523
1524         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
1525                 return entity->variable.v.vla_base;
1526
1527         case DECLARATION_KIND_FUNCTION: {
1528                 type_t  *const type = skip_typeref(entity->declaration.type);
1529                 ir_mode *const mode = get_ir_mode(type);
1530                 return create_symconst(dbgi, mode, entity->function.entity);
1531         }
1532
1533         case DECLARATION_KIND_INNER_FUNCTION:
1534         case DECLARATION_KIND_COMPOUND_MEMBER:
1535                 panic("not implemented reference type");
1536         }
1537
1538         panic("reference to declaration with unknown type found");
1539 }
1540
1541 /**
1542  * Transform calls to builtin functions.
1543  */
1544 static ir_node *process_builtin_call(const call_expression_t *call)
1545 {
1546         dbg_info *dbgi = get_dbg_info(&call->base.source_position);
1547
1548         assert(call->function->kind == EXPR_BUILTIN_SYMBOL);
1549         builtin_symbol_expression_t *builtin = &call->function->builtin_symbol;
1550
1551         type_t *type = skip_typeref(builtin->base.type);
1552         assert(is_type_pointer(type));
1553
1554         type_t   *function_type = skip_typeref(type->pointer.points_to);
1555         symbol_t *symbol        = builtin->symbol;
1556
1557         switch(symbol->ID) {
1558         case T___builtin_alloca: {
1559                 if (call->arguments == NULL || call->arguments->next != NULL) {
1560                         panic("invalid number of parameters on __builtin_alloca");
1561                 }
1562                 expression_t *argument = call->arguments->expression;
1563                 ir_node      *size     = expression_to_firm(argument);
1564
1565                 ir_node *store  = get_store();
1566                 ir_node *alloca = new_d_Alloc(dbgi, store, size, firm_unknown_type,
1567                                               stack_alloc);
1568                 ir_node *proj_m = new_Proj(alloca, mode_M, pn_Alloc_M);
1569                 set_store(proj_m);
1570                 ir_node *res    = new_Proj(alloca, mode_P_data, pn_Alloc_res);
1571
1572                 return res;
1573         }
1574
1575         case T___builtin_huge_val:
1576         case T___builtin_inf:
1577         case T___builtin_inff:
1578         case T___builtin_infl: {
1579                 ir_mode *mode = get_ir_mode(function_type->function.return_type);
1580                 tarval  *tv   = get_mode_infinite(mode);
1581                 ir_node *res  = new_d_Const(dbgi, tv);
1582                 return   res;
1583         }
1584         case T___builtin_nan:
1585         case T___builtin_nanf:
1586         case T___builtin_nanl: {
1587                 /* Ignore string for now... */
1588                 assert(is_type_function(function_type));
1589                 ir_mode *mode = get_ir_mode(function_type->function.return_type);
1590                 tarval  *tv   = get_mode_NAN(mode);
1591                 ir_node *res  = new_d_Const(dbgi, tv);
1592                 return res;
1593         }
1594         case T___builtin_expect: {
1595                 expression_t *argument = call->arguments->expression;
1596                 return _expression_to_firm(argument);
1597         }
1598         case T___builtin_va_end:
1599                 return NULL;
1600         default:
1601                 panic("Unsupported builtin found\n");
1602         }
1603 }
1604
1605 /**
1606  * Transform a call expression.
1607  * Handles some special cases, like alloca() calls, which must be resolved
1608  * BEFORE the inlines runs. Inlining routines calling alloca() is dangerous,
1609  * 176.gcc for instance might allocate 2GB instead of 256 MB if alloca is not
1610  * handled right...
1611  */
1612 static ir_node *call_expression_to_firm(const call_expression_t *call)
1613 {
1614         dbg_info *dbgi  = get_dbg_info(&call->base.source_position);
1615         assert(get_cur_block() != NULL);
1616
1617         expression_t *function = call->function;
1618         if (function->kind == EXPR_BUILTIN_SYMBOL) {
1619                 return process_builtin_call(call);
1620         }
1621         if (function->kind == EXPR_REFERENCE) {
1622                 const reference_expression_t *ref    = &function->reference;
1623                 entity_t                     *entity = ref->entity;
1624
1625                 if (entity->kind == ENTITY_FUNCTION
1626                                 && entity->function.entity == rts_entities[rts_alloca]) {
1627                         /* handle alloca() call */
1628                         expression_t *argument = call->arguments->expression;
1629                         ir_node      *size     = expression_to_firm(argument);
1630
1631                         size = create_conv(dbgi, size, get_ir_mode(type_size_t));
1632
1633                         ir_node  *store  = get_store();
1634                         dbg_info *dbgi   = get_dbg_info(&call->base.source_position);
1635                         ir_node  *alloca = new_d_Alloc(dbgi, store, size, firm_unknown_type,
1636                                                        stack_alloc);
1637                         ir_node  *proj_m = new_Proj(alloca, mode_M, pn_Alloc_M);
1638                         set_store(proj_m);
1639                         ir_node  *res    = new_Proj(alloca, mode_P_data, pn_Alloc_res);
1640
1641                         return res;
1642                 }
1643         }
1644         ir_node *callee = expression_to_firm(function);
1645
1646         type_t *type = skip_typeref(function->base.type);
1647         assert(is_type_pointer(type));
1648         pointer_type_t *pointer_type = &type->pointer;
1649         type_t         *points_to    = skip_typeref(pointer_type->points_to);
1650         assert(is_type_function(points_to));
1651         function_type_t *function_type = &points_to->function;
1652
1653         int      n_parameters = 0;
1654         ir_type *ir_method_type  = get_ir_type((type_t*) function_type);
1655         ir_type *new_method_type = NULL;
1656         if (function_type->variadic || function_type->unspecified_parameters) {
1657                 const call_argument_t *argument = call->arguments;
1658                 for ( ; argument != NULL; argument = argument->next) {
1659                         ++n_parameters;
1660                 }
1661
1662                 /* we need to construct a new method type matching the call
1663                  * arguments... */
1664                 int n_res       = get_method_n_ress(ir_method_type);
1665                 dbg_info *dbgi  = get_dbg_info(&call->base.source_position);
1666                 new_method_type = new_d_type_method(id_unique("calltype.%u"),
1667                                                     n_parameters, n_res, dbgi);
1668                 set_method_calling_convention(new_method_type,
1669                                get_method_calling_convention(ir_method_type));
1670                 set_method_additional_properties(new_method_type,
1671                                get_method_additional_properties(ir_method_type));
1672                 set_method_variadicity(new_method_type,
1673                                        get_method_variadicity(ir_method_type));
1674
1675                 for (int i = 0; i < n_res; ++i) {
1676                         set_method_res_type(new_method_type, i,
1677                                             get_method_res_type(ir_method_type, i));
1678                 }
1679                 argument = call->arguments;
1680                 for (int i = 0; i < n_parameters; ++i, argument = argument->next) {
1681                         expression_t *expression = argument->expression;
1682                         ir_type      *irtype     = get_ir_type(expression->base.type);
1683                         set_method_param_type(new_method_type, i, irtype);
1684                 }
1685                 ir_method_type = new_method_type;
1686         } else {
1687                 n_parameters = get_method_n_params(ir_method_type);
1688         }
1689
1690         ir_node *in[n_parameters];
1691
1692         const call_argument_t *argument = call->arguments;
1693         for (int n = 0; n < n_parameters; ++n) {
1694                 expression_t *expression = argument->expression;
1695                 ir_node      *arg_node   = expression_to_firm(expression);
1696
1697                 arg_node = do_strict_conv(dbgi, arg_node);
1698
1699                 in[n] = arg_node;
1700
1701                 argument = argument->next;
1702         }
1703
1704         ir_node  *store = get_store();
1705         ir_node  *node  = new_d_Call(dbgi, store, callee, n_parameters, in,
1706                                      ir_method_type);
1707         ir_node  *mem   = new_d_Proj(dbgi, node, mode_M, pn_Call_M_regular);
1708         set_store(mem);
1709
1710         type_t  *return_type = skip_typeref(function_type->return_type);
1711         ir_node *result      = NULL;
1712
1713         if (!is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
1714                 ir_mode *mode;
1715                 if (is_type_scalar(return_type)) {
1716                         mode = get_ir_mode(return_type);
1717                 } else {
1718                         mode = mode_P_data;
1719                 }
1720                 ir_node *resproj = new_d_Proj(dbgi, node, mode_T, pn_Call_T_result);
1721                 result           = new_d_Proj(dbgi, resproj, mode, 0);
1722         }
1723
1724         if (function->kind == EXPR_REFERENCE &&
1725             function->reference.entity->declaration.modifiers & DM_NORETURN) {
1726                 /* A dead end:  Keep the Call and the Block.  Also place all further
1727                  * nodes into a new and unreachable block. */
1728                 keep_alive(node);
1729                 keep_alive(get_cur_block());
1730                 new_Block(0, NULL);
1731         }
1732
1733         return result;
1734 }
1735
1736 static void statement_to_firm(statement_t *statement);
1737 static ir_node *compound_statement_to_firm(compound_statement_t *compound);
1738
1739 static ir_node *expression_to_addr(const expression_t *expression);
1740 static ir_node *create_condition_evaluation(const expression_t *expression,
1741                                             ir_node *true_block,
1742                                             ir_node *false_block);
1743
1744 static void assign_value(dbg_info *dbgi, ir_node *addr, type_t *type,
1745                          ir_node *value)
1746 {
1747         value = do_strict_conv(dbgi, value);
1748
1749         ir_node *memory = get_store();
1750
1751         if (is_type_scalar(type)) {
1752                 ir_node  *store     = new_d_Store(dbgi, memory, addr, value);
1753                 ir_node  *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
1754                 if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE && !is_Bad(store))
1755                         set_Store_volatility(store, volatility_is_volatile);
1756                 set_store(store_mem);
1757         } else {
1758                 ir_type *irtype    = get_ir_type(type);
1759                 ir_node *copyb     = new_d_CopyB(dbgi, memory, addr, value, irtype);
1760                 ir_node *copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M_regular);
1761                 set_store(copyb_mem);
1762         }
1763 }
1764
1765 static tarval *create_bitfield_mask(ir_mode *mode, int offset, int size)
1766 {
1767         tarval *all_one   = get_mode_all_one(mode);
1768         int     mode_size = get_mode_size_bits(mode);
1769
1770         assert(offset >= 0);
1771         assert(size   >= 0);
1772         assert(offset + size <= mode_size);
1773         if (size == mode_size) {
1774                 return all_one;
1775         }
1776
1777         long    shiftr    = get_mode_size_bits(mode) - size;
1778         long    shiftl    = offset;
1779         tarval *tv_shiftr = new_tarval_from_long(shiftr, mode_uint);
1780         tarval *tv_shiftl = new_tarval_from_long(shiftl, mode_uint);
1781         tarval *mask0     = tarval_shr(all_one, tv_shiftr);
1782         tarval *mask1     = tarval_shl(mask0, tv_shiftl);
1783
1784         return mask1;
1785 }
1786
1787 static void bitfield_store_to_firm(dbg_info *dbgi,
1788                 ir_entity *entity, ir_node *addr, ir_node *value, bool set_volatile)
1789 {
1790         ir_type *entity_type = get_entity_type(entity);
1791         ir_type *base_type   = get_primitive_base_type(entity_type);
1792         assert(base_type != NULL);
1793         ir_mode *mode        = get_type_mode(base_type);
1794
1795         value = create_conv(dbgi, value, mode);
1796
1797         /* kill upper bits of value and shift to right position */
1798         int      bitoffset    = get_entity_offset_bits_remainder(entity);
1799         int      bitsize      = get_mode_size_bits(get_type_mode(entity_type));
1800
1801         tarval  *mask            = create_bitfield_mask(mode, 0, bitsize);
1802         ir_node *mask_node       = new_d_Const(dbgi, mask);
1803         ir_node *value_masked    = new_d_And(dbgi, value, mask_node, mode);
1804         tarval  *shiftl          = new_tarval_from_long(bitoffset, mode_uint);
1805         ir_node *shiftcount      = new_d_Const(dbgi, shiftl);
1806         ir_node *value_maskshift = new_d_Shl(dbgi, value_masked, shiftcount, mode);
1807
1808         /* load current value */
1809         ir_node  *mem             = get_store();
1810         ir_node  *load            = new_d_Load(dbgi, mem, addr, mode);
1811         ir_node  *load_mem        = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1812         ir_node  *load_res        = new_d_Proj(dbgi, load, mode, pn_Load_res);
1813         tarval   *shift_mask      = create_bitfield_mask(mode, bitoffset, bitsize);
1814         tarval   *inv_mask        = tarval_not(shift_mask);
1815         ir_node  *inv_mask_node   = new_d_Const(dbgi, inv_mask);
1816         ir_node  *load_res_masked = new_d_And(dbgi, load_res, inv_mask_node, mode);
1817
1818         /* construct new value and store */
1819         ir_node *new_val   = new_d_Or(dbgi, load_res_masked, value_maskshift, mode);
1820         ir_node *store     = new_d_Store(dbgi, load_mem, addr, new_val);
1821         ir_node *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
1822         set_store(store_mem);
1823
1824         if (set_volatile) {
1825                 if (!is_Bad(load))
1826                         set_Load_volatility(load, volatility_is_volatile);
1827                 if (!is_Bad(store))
1828                         set_Store_volatility(store, volatility_is_volatile);
1829         }
1830 }
1831
1832 static ir_node *bitfield_extract_to_firm(const select_expression_t *expression,
1833                 ir_node *addr)
1834 {
1835         dbg_info *dbgi     = get_dbg_info(&expression->base.source_position);
1836         type_t   *type     = expression->base.type;
1837         ir_mode  *mode     = get_ir_mode(type);
1838         ir_node  *mem      = get_store();
1839         ir_node  *load     = new_d_Load(dbgi, mem, addr, mode);
1840         ir_node  *load_mem = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1841         ir_node  *load_res = new_d_Proj(dbgi, load, mode, pn_Load_res);
1842
1843         load_res           = create_conv(dbgi, load_res, mode_int);
1844
1845         set_store(load_mem);
1846
1847         /* kill upper bits */
1848         assert(expression->compound_entry->kind == ENTITY_COMPOUND_MEMBER);
1849         ir_entity *entity       = expression->compound_entry->compound_member.entity;
1850         int        bitoffset    = get_entity_offset_bits_remainder(entity);
1851         ir_type   *entity_type  = get_entity_type(entity);
1852         int        bitsize      = get_mode_size_bits(get_type_mode(entity_type));
1853         long       shift_bitsl  = machine_size - bitoffset - bitsize;
1854         assert(shift_bitsl >= 0);
1855         tarval    *tvl          = new_tarval_from_long(shift_bitsl, mode_uint);
1856         ir_node   *countl       = new_d_Const(dbgi, tvl);
1857         ir_node   *shiftl       = new_d_Shl(dbgi, load_res, countl, mode_int);
1858
1859         long       shift_bitsr  = bitoffset + shift_bitsl;
1860         assert(shift_bitsr <= (long) machine_size);
1861         tarval    *tvr          = new_tarval_from_long(shift_bitsr, mode_uint);
1862         ir_node   *countr       = new_d_Const(dbgi, tvr);
1863         ir_node   *shiftr;
1864         if (mode_is_signed(mode)) {
1865                 shiftr = new_d_Shrs(dbgi, shiftl, countr, mode_int);
1866         } else {
1867                 shiftr = new_d_Shr(dbgi, shiftl, countr, mode_int);
1868         }
1869
1870         return create_conv(dbgi, shiftr, mode);
1871 }
1872
1873 /* make sure the selected compound type is constructed */
1874 static void construct_select_compound(const select_expression_t *expression)
1875 {
1876         type_t *type = skip_typeref(expression->compound->base.type);
1877         if (is_type_pointer(type)) {
1878                 type = type->pointer.points_to;
1879         }
1880         (void) get_ir_type(type);
1881 }
1882
1883 static void set_value_for_expression_addr(const expression_t *expression,
1884                                           ir_node *value, ir_node *addr)
1885 {
1886         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
1887         value          = do_strict_conv(dbgi, value);
1888
1889         if (expression->kind == EXPR_REFERENCE) {
1890                 const reference_expression_t *ref = &expression->reference;
1891
1892                 entity_t *entity = ref->entity;
1893                 assert(is_declaration(entity));
1894                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
1895                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE) {
1896                         set_value(entity->variable.v.value_number, value);
1897                         return;
1898                 } else if (entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
1899                         set_value(entity->parameter.v.value_number, value);
1900                         return;
1901                 }
1902         }
1903
1904         if (addr == NULL)
1905                 addr = expression_to_addr(expression);
1906         assert(addr != NULL);
1907
1908         type_t *type = skip_typeref(expression->base.type);
1909
1910         if (expression->kind == EXPR_SELECT) {
1911                 const select_expression_t *select = &expression->select;
1912
1913                 construct_select_compound(select);
1914
1915                 entity_t *entity = select->compound_entry;
1916                 assert(entity->kind == ENTITY_COMPOUND_MEMBER);
1917                 if (entity->declaration.type->kind == TYPE_BITFIELD) {
1918                         ir_entity *irentity = entity->compound_member.entity;
1919                         bool       set_volatile
1920                                 = select->base.type->base.qualifiers & TYPE_QUALIFIER_VOLATILE;
1921                         bitfield_store_to_firm(dbgi, irentity, addr, value, set_volatile);
1922                         return;
1923                 }
1924         }
1925
1926         assign_value(dbgi, addr, type, value);
1927 }
1928
1929 static void set_value_for_expression(const expression_t *expression,
1930                                      ir_node *value)
1931 {
1932         set_value_for_expression_addr(expression, value, NULL);
1933 }
1934
1935 static ir_node *get_value_from_lvalue(const expression_t *expression,
1936                                       ir_node *addr)
1937 {
1938         if (expression->kind == EXPR_REFERENCE) {
1939                 const reference_expression_t *ref = &expression->reference;
1940
1941                 entity_t *entity = ref->entity;
1942                 assert(entity->kind == ENTITY_VARIABLE
1943                                 || entity->kind == ENTITY_PARAMETER);
1944                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
1945                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE) {
1946                         assert(addr == NULL);
1947                         ir_mode *mode = get_ir_mode(expression->base.type);
1948                         return get_value(entity->variable.v.value_number, mode);
1949                 } else if (entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
1950                         assert(addr == NULL);
1951                         ir_mode *mode = get_ir_mode(expression->base.type);
1952                         return get_value(entity->parameter.v.value_number, mode);
1953                 }
1954         }
1955
1956         assert(addr != NULL);
1957         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
1958
1959         ir_node *value;
1960         if (expression->kind == EXPR_SELECT &&
1961             expression->select.compound_entry->declaration.type->kind == TYPE_BITFIELD){
1962             construct_select_compound(&expression->select);
1963                 value = bitfield_extract_to_firm(&expression->select, addr);
1964         } else {
1965                 value = deref_address(dbgi, expression->base.type, addr);
1966         }
1967
1968         return value;
1969 }
1970
1971
1972 static ir_node *create_incdec(const unary_expression_t *expression)
1973 {
1974         dbg_info *const     dbgi = get_dbg_info(&expression->base.source_position);
1975         const expression_t *value_expr = expression->value;
1976         ir_node            *addr       = expression_to_addr(value_expr);
1977         ir_node            *value      = get_value_from_lvalue(value_expr, addr);
1978
1979         type_t  *type = skip_typeref(expression->base.type);
1980         ir_mode *mode = get_ir_mode(expression->base.type);
1981
1982         ir_node *offset;
1983         if (is_type_pointer(type)) {
1984                 pointer_type_t *pointer_type = &type->pointer;
1985                 offset                       = get_type_size(pointer_type->points_to);
1986         } else {
1987                 assert(is_type_arithmetic(type));
1988                 offset = new_Const(get_mode_one(mode));
1989         }
1990
1991         ir_node *result;
1992         ir_node *store_value;
1993         switch(expression->base.kind) {
1994         case EXPR_UNARY_POSTFIX_INCREMENT:
1995                 result      = value;
1996                 store_value = new_d_Add(dbgi, value, offset, mode);
1997                 break;
1998         case EXPR_UNARY_POSTFIX_DECREMENT:
1999                 result      = value;
2000                 store_value = new_d_Sub(dbgi, value, offset, mode);
2001                 break;
2002         case EXPR_UNARY_PREFIX_INCREMENT:
2003                 result      = new_d_Add(dbgi, value, offset, mode);
2004                 store_value = result;
2005                 break;
2006         case EXPR_UNARY_PREFIX_DECREMENT:
2007                 result      = new_d_Sub(dbgi, value, offset, mode);
2008                 store_value = result;
2009                 break;
2010         default:
2011                 panic("no incdec expr in create_incdec");
2012         }
2013
2014         set_value_for_expression_addr(value_expr, store_value, addr);
2015
2016         return result;
2017 }
2018
2019 static bool is_local_variable(expression_t *expression)
2020 {
2021         if (expression->kind != EXPR_REFERENCE)
2022                 return false;
2023         reference_expression_t *ref_expr = &expression->reference;
2024         entity_t               *entity   = ref_expr->entity;
2025         if (entity->kind != ENTITY_VARIABLE)
2026                 return false;
2027         assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2028         return entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE;
2029 }
2030
2031 static pn_Cmp get_pnc(const expression_kind_t kind, type_t *const type)
2032 {
2033         switch(kind) {
2034         case EXPR_BINARY_EQUAL:         return pn_Cmp_Eq;
2035         case EXPR_BINARY_ISLESSGREATER: return pn_Cmp_Lg;
2036         case EXPR_BINARY_NOTEQUAL:
2037                 return is_type_float(skip_typeref(type)) ? pn_Cmp_Ne : pn_Cmp_Lg;
2038         case EXPR_BINARY_ISLESS:
2039         case EXPR_BINARY_LESS:          return pn_Cmp_Lt;
2040         case EXPR_BINARY_ISLESSEQUAL:
2041         case EXPR_BINARY_LESSEQUAL:     return pn_Cmp_Le;
2042         case EXPR_BINARY_ISGREATER:
2043         case EXPR_BINARY_GREATER:       return pn_Cmp_Gt;
2044         case EXPR_BINARY_ISGREATEREQUAL:
2045         case EXPR_BINARY_GREATEREQUAL:  return pn_Cmp_Ge;
2046         case EXPR_BINARY_ISUNORDERED:   return pn_Cmp_Uo;
2047
2048         default:
2049                 break;
2050         }
2051         panic("trying to get pn_Cmp from non-comparison binexpr type");
2052 }
2053
2054 /**
2055  * Handle the assume optimizer hint: check if a Confirm
2056  * node can be created.
2057  *
2058  * @param dbi    debug info
2059  * @param expr   the IL assume expression
2060  *
2061  * we support here only some simple cases:
2062  *  - var rel const
2063  *  - const rel val
2064  *  - var rel var
2065  */
2066 static ir_node *handle_assume_compare(dbg_info *dbi,
2067                                       const binary_expression_t *expression)
2068 {
2069         expression_t *op1 = expression->left;
2070         expression_t *op2 = expression->right;
2071         entity_t     *var2, *var = NULL;
2072         ir_node      *res = NULL;
2073         pn_Cmp        cmp_val;
2074
2075         cmp_val = get_pnc(expression->base.kind, op1->base.type);
2076
2077         if (is_local_variable(op1) && is_local_variable(op2)) {
2078         var  = op1->reference.entity;
2079             var2 = op2->reference.entity;
2080
2081                 type_t  *const type = skip_typeref(var->declaration.type);
2082                 ir_mode *const mode = get_ir_mode(type);
2083
2084                 ir_node *const irn1 = get_value(var->variable.v.value_number, mode);
2085                 ir_node *const irn2 = get_value(var2->variable.v.value_number, mode);
2086
2087                 res = new_d_Confirm(dbi, irn2, irn1, get_inversed_pnc(cmp_val));
2088                 set_value(var2->variable.v.value_number, res);
2089
2090                 res = new_d_Confirm(dbi, irn1, irn2, cmp_val);
2091                 set_value(var->variable.v.value_number, res);
2092
2093                 return res;
2094         }
2095
2096         expression_t *con;
2097         if (is_local_variable(op1) && is_constant_expression(op2)) {
2098                 var = op1->reference.entity;
2099                 con = op2;
2100         } else if (is_constant_expression(op1) && is_local_variable(op2)) {
2101                 cmp_val = get_inversed_pnc(cmp_val);
2102                 var = op2->reference.entity;
2103                 con = op1;
2104         }
2105
2106         if (var != NULL) {
2107                 type_t  *const type = skip_typeref(var->declaration.type);
2108                 ir_mode *const mode = get_ir_mode(type);
2109
2110                 res = get_value(var->variable.v.value_number, mode);
2111                 res = new_d_Confirm(dbi, res, expression_to_firm(con), cmp_val);
2112                 set_value(var->variable.v.value_number, res);
2113         }
2114         return res;
2115 }
2116
2117 /**
2118  * Handle the assume optimizer hint.
2119  *
2120  * @param dbi    debug info
2121  * @param expr   the IL assume expression
2122  */
2123 static ir_node *handle_assume(dbg_info *dbi, const expression_t *expression) {
2124         switch(expression->kind) {
2125         case EXPR_BINARY_EQUAL:
2126         case EXPR_BINARY_NOTEQUAL:
2127         case EXPR_BINARY_LESS:
2128         case EXPR_BINARY_LESSEQUAL:
2129         case EXPR_BINARY_GREATER:
2130         case EXPR_BINARY_GREATEREQUAL:
2131                 return handle_assume_compare(dbi, &expression->binary);
2132         default:
2133                 return NULL;
2134         }
2135 }
2136
2137 static ir_node *unary_expression_to_firm(const unary_expression_t *expression)
2138 {
2139         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2140         type_t   *type = skip_typeref(expression->base.type);
2141
2142         if (expression->base.kind == EXPR_UNARY_TAKE_ADDRESS)
2143                 return expression_to_addr(expression->value);
2144
2145         const expression_t *value = expression->value;
2146
2147         switch(expression->base.kind) {
2148         case EXPR_UNARY_NEGATE: {
2149                 ir_node *value_node = expression_to_firm(value);
2150                 ir_mode *mode = get_ir_mode(type);
2151                 return new_d_Minus(dbgi, value_node, mode);
2152         }
2153         case EXPR_UNARY_PLUS:
2154                 return expression_to_firm(value);
2155         case EXPR_UNARY_BITWISE_NEGATE: {
2156                 ir_node *value_node = expression_to_firm(value);
2157                 ir_mode *mode = get_ir_mode(type);
2158                 return new_d_Not(dbgi, value_node, mode);
2159         }
2160         case EXPR_UNARY_NOT: {
2161                 ir_node *value_node = _expression_to_firm(value);
2162                 value_node          = create_conv(dbgi, value_node, mode_b);
2163                 ir_node *res        = new_d_Not(dbgi, value_node, mode_b);
2164                 return res;
2165         }
2166         case EXPR_UNARY_DEREFERENCE: {
2167                 ir_node *value_node = expression_to_firm(value);
2168                 type_t  *value_type = skip_typeref(value->base.type);
2169                 assert(is_type_pointer(value_type));
2170                 type_t  *points_to  = value_type->pointer.points_to;
2171                 return deref_address(dbgi, points_to, value_node);
2172         }
2173         case EXPR_UNARY_POSTFIX_INCREMENT:
2174         case EXPR_UNARY_POSTFIX_DECREMENT:
2175         case EXPR_UNARY_PREFIX_INCREMENT:
2176         case EXPR_UNARY_PREFIX_DECREMENT:
2177                 return create_incdec(expression);
2178         case EXPR_UNARY_CAST: {
2179                 ir_node *value_node = expression_to_firm(value);
2180                 if (is_type_scalar(type)) {
2181                         ir_mode *mode = get_ir_mode(type);
2182                         ir_node *node = create_conv(dbgi, value_node, mode);
2183                         node = do_strict_conv(dbgi, node);
2184                         return node;
2185                 } else {
2186                         /* make sure firm type is constructed */
2187                         (void) get_ir_type(type);
2188                         return value_node;
2189                 }
2190         }
2191         case EXPR_UNARY_CAST_IMPLICIT: {
2192                 ir_node *value_node = expression_to_firm(value);
2193                 if (is_type_scalar(type)) {
2194                         ir_mode *mode = get_ir_mode(type);
2195                         return create_conv(dbgi, value_node, mode);
2196                 } else {
2197                         return value_node;
2198                 }
2199         }
2200         case EXPR_UNARY_ASSUME:
2201                 if (firm_opt.confirm)
2202                         return handle_assume(dbgi, value);
2203                 else
2204                         return NULL;
2205
2206         default:
2207                 break;
2208         }
2209         panic("invalid UNEXPR type found");
2210 }
2211
2212 /**
2213  * produces a 0/1 depending of the value of a mode_b node
2214  */
2215 static ir_node *produce_condition_result(const expression_t *expression,
2216                                          ir_mode *mode, dbg_info *dbgi)
2217 {
2218         ir_node *cur_block = get_cur_block();
2219
2220         ir_node *one_block = new_immBlock();
2221         ir_node *one       = new_Const(get_mode_one(mode));
2222         ir_node *jmp_one   = new_d_Jmp(dbgi);
2223
2224         ir_node *zero_block = new_immBlock();
2225         ir_node *zero       = new_Const(get_mode_null(mode));
2226         ir_node *jmp_zero   = new_d_Jmp(dbgi);
2227
2228         set_cur_block(cur_block);
2229         create_condition_evaluation(expression, one_block, zero_block);
2230         mature_immBlock(one_block);
2231         mature_immBlock(zero_block);
2232
2233         ir_node *in_cf[2] = { jmp_one, jmp_zero };
2234         new_Block(2, in_cf);
2235
2236         ir_node *in[2] = { one, zero };
2237         ir_node *val   = new_d_Phi(dbgi, 2, in, mode);
2238
2239         return val;
2240 }
2241
2242 static ir_node *adjust_for_pointer_arithmetic(dbg_info *dbgi,
2243                 ir_node *value, type_t *type)
2244 {
2245         ir_mode        *const mode         = get_ir_mode(type_ptrdiff_t);
2246         assert(is_type_pointer(type));
2247         pointer_type_t *const pointer_type = &type->pointer;
2248         type_t         *const points_to    = skip_typeref(pointer_type->points_to);
2249         unsigned              elem_size    = get_type_size_const(points_to);
2250
2251         value = create_conv(dbgi, value, mode);
2252
2253         /* gcc extension: allow arithmetic with void * and function * */
2254         if ((elem_size == 0 && is_type_atomic(points_to, ATOMIC_TYPE_VOID)) ||
2255             is_type_function(points_to))  {
2256                 elem_size = 1;
2257         }
2258
2259         assert(elem_size >= 1);
2260         if (elem_size == 1)
2261                 return value;
2262
2263         ir_node *const cnst = new_Const_long(mode, (long)elem_size);
2264         ir_node *const mul  = new_d_Mul(dbgi, value, cnst, mode);
2265         return mul;
2266 }
2267
2268 static ir_node *create_op(dbg_info *dbgi, const binary_expression_t *expression,
2269                           ir_node *left, ir_node *right)
2270 {
2271         ir_mode  *mode;
2272         type_t   *type_left  = skip_typeref(expression->left->base.type);
2273         type_t   *type_right = skip_typeref(expression->right->base.type);
2274
2275         expression_kind_t kind = expression->base.kind;
2276
2277         switch (kind) {
2278         case EXPR_BINARY_SHIFTLEFT:
2279         case EXPR_BINARY_SHIFTRIGHT:
2280         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2281         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2282                 mode  = get_irn_mode(left);
2283                 right = create_conv(dbgi, right, mode_uint);
2284                 break;
2285
2286         case EXPR_BINARY_SUB:
2287                 if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
2288                         const pointer_type_t *const ptr_type = &type_left->pointer;
2289
2290                         mode = get_ir_mode(expression->base.type);
2291                         ir_node *const elem_size = get_type_size(ptr_type->points_to);
2292                         ir_node *const conv_size = new_d_Conv(dbgi, elem_size, mode);
2293                         ir_node *const sub       = new_d_Sub(dbgi, left, right, mode);
2294                         ir_node *const no_mem    = new_NoMem();
2295                         ir_node *const div       = new_d_DivRL(dbgi, no_mem, sub, conv_size,
2296                                                                                                    mode, op_pin_state_floats);
2297                         return new_d_Proj(dbgi, div, mode, pn_Div_res);
2298                 }
2299                 /* fallthrough */
2300         case EXPR_BINARY_SUB_ASSIGN:
2301                 if (is_type_pointer(type_left)) {
2302                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2303                         mode  = get_ir_mode(type_left);
2304                         break;
2305                 }
2306                 goto normal_node;
2307
2308         case EXPR_BINARY_ADD:
2309         case EXPR_BINARY_ADD_ASSIGN:
2310                 if (is_type_pointer(type_left)) {
2311                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2312                         mode  = get_ir_mode(type_left);
2313                         break;
2314                 } else if (is_type_pointer(type_right)) {
2315                         left  = adjust_for_pointer_arithmetic(dbgi, left, type_right);
2316                         mode  = get_ir_mode(type_right);
2317                         break;
2318                 }
2319                 goto normal_node;
2320
2321         default:
2322 normal_node:
2323                 mode = get_ir_mode(type_right);
2324                 left = create_conv(dbgi, left, mode);
2325                 break;
2326         }
2327
2328         switch (kind) {
2329         case EXPR_BINARY_ADD_ASSIGN:
2330         case EXPR_BINARY_ADD:
2331                 return new_d_Add(dbgi, left, right, mode);
2332         case EXPR_BINARY_SUB_ASSIGN:
2333         case EXPR_BINARY_SUB:
2334                 return new_d_Sub(dbgi, left, right, mode);
2335         case EXPR_BINARY_MUL_ASSIGN:
2336         case EXPR_BINARY_MUL:
2337                 return new_d_Mul(dbgi, left, right, mode);
2338         case EXPR_BINARY_BITWISE_AND:
2339         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2340                 return new_d_And(dbgi, left, right, mode);
2341         case EXPR_BINARY_BITWISE_OR:
2342         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2343                 return new_d_Or(dbgi, left, right, mode);
2344         case EXPR_BINARY_BITWISE_XOR:
2345         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2346                 return new_d_Eor(dbgi, left, right, mode);
2347         case EXPR_BINARY_SHIFTLEFT:
2348         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2349                 return new_d_Shl(dbgi, left, right, mode);
2350         case EXPR_BINARY_SHIFTRIGHT:
2351         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2352                 if (mode_is_signed(mode)) {
2353                         return new_d_Shrs(dbgi, left, right, mode);
2354                 } else {
2355                         return new_d_Shr(dbgi, left, right, mode);
2356                 }
2357         case EXPR_BINARY_DIV:
2358         case EXPR_BINARY_DIV_ASSIGN: {
2359                 ir_node *pin = new_Pin(new_NoMem());
2360                 ir_node *op;
2361                 ir_node *res;
2362                 if (mode_is_float(mode)) {
2363                         op  = new_d_Quot(dbgi, pin, left, right, mode, op_pin_state_floats);
2364                         res = new_d_Proj(dbgi, op, mode, pn_Quot_res);
2365                 } else {
2366                         op  = new_d_Div(dbgi, pin, left, right, mode, op_pin_state_floats);
2367                         res = new_d_Proj(dbgi, op, mode, pn_Div_res);
2368                 }
2369                 return res;
2370         }
2371         case EXPR_BINARY_MOD:
2372         case EXPR_BINARY_MOD_ASSIGN: {
2373                 ir_node *pin = new_Pin(new_NoMem());
2374                 assert(!mode_is_float(mode));
2375                 ir_node *op  = new_d_Mod(dbgi, pin, left, right, mode,
2376                                          op_pin_state_floats);
2377                 ir_node *res = new_d_Proj(dbgi, op, mode, pn_Mod_res);
2378                 return res;
2379         }
2380         default:
2381                 panic("unexpected expression kind");
2382         }
2383 }
2384
2385 static ir_node *create_lazy_op(const binary_expression_t *expression)
2386 {
2387         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2388         type_t   *type = expression->base.type;
2389         ir_mode  *mode = get_ir_mode(type);
2390
2391         if (is_constant_expression(expression->left)) {
2392                 long val = fold_constant(expression->left);
2393                 expression_kind_t ekind = expression->base.kind;
2394                 assert(ekind == EXPR_BINARY_LOGICAL_AND || ekind == EXPR_BINARY_LOGICAL_OR);
2395                 if ((ekind == EXPR_BINARY_LOGICAL_AND && val != 0) ||
2396                     (ekind == EXPR_BINARY_LOGICAL_OR  && val == 0)) {
2397                         return produce_condition_result(expression->right, mode, dbgi);
2398                 } else {
2399                         return new_Const(get_mode_one(mode));
2400                 }
2401         }
2402
2403         return produce_condition_result((const expression_t*) expression, mode,
2404                                         dbgi);
2405 }
2406
2407 typedef ir_node * (*create_arithmetic_func)(dbg_info *dbgi, ir_node *left,
2408                                             ir_node *right, ir_mode *mode);
2409
2410 static ir_node *create_assign_binop(const binary_expression_t *expression)
2411 {
2412         dbg_info *const     dbgi = get_dbg_info(&expression->base.source_position);
2413         const expression_t *left_expr = expression->left;
2414         ir_mode            *left_mode = get_ir_mode(left_expr->base.type);
2415         ir_node            *right     = expression_to_firm(expression->right);
2416         ir_node            *left_addr = expression_to_addr(left_expr);
2417         ir_node            *left      = get_value_from_lvalue(left_expr, left_addr);
2418         ir_node            *result    = create_op(dbgi, expression, left, right);
2419
2420         result = create_conv(dbgi, result, left_mode);
2421         result = do_strict_conv(dbgi, result);
2422
2423         set_value_for_expression_addr(left_expr, result, left_addr);
2424
2425         return result;
2426 }
2427
2428 static ir_node *binary_expression_to_firm(const binary_expression_t *expression)
2429 {
2430         expression_kind_t kind = expression->base.kind;
2431
2432         switch(kind) {
2433         case EXPR_BINARY_EQUAL:
2434         case EXPR_BINARY_NOTEQUAL:
2435         case EXPR_BINARY_LESS:
2436         case EXPR_BINARY_LESSEQUAL:
2437         case EXPR_BINARY_GREATER:
2438         case EXPR_BINARY_GREATEREQUAL:
2439         case EXPR_BINARY_ISGREATER:
2440         case EXPR_BINARY_ISGREATEREQUAL:
2441         case EXPR_BINARY_ISLESS:
2442         case EXPR_BINARY_ISLESSEQUAL:
2443         case EXPR_BINARY_ISLESSGREATER:
2444         case EXPR_BINARY_ISUNORDERED: {
2445                 dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2446                 ir_node *left  = expression_to_firm(expression->left);
2447                 ir_node *right = expression_to_firm(expression->right);
2448                 ir_node *cmp   = new_d_Cmp(dbgi, left, right);
2449                 long     pnc   = get_pnc(kind, expression->left->base.type);
2450                 ir_node *proj  = new_d_Proj(dbgi, cmp, mode_b, pnc);
2451                 return proj;
2452         }
2453         case EXPR_BINARY_ASSIGN: {
2454                 ir_node *addr  = expression_to_addr(expression->left);
2455                 ir_node *right = expression_to_firm(expression->right);
2456                 set_value_for_expression_addr(expression->left, right, addr);
2457
2458                 return right;
2459         }
2460         case EXPR_BINARY_ADD:
2461         case EXPR_BINARY_SUB:
2462         case EXPR_BINARY_MUL:
2463         case EXPR_BINARY_DIV:
2464         case EXPR_BINARY_MOD:
2465         case EXPR_BINARY_BITWISE_AND:
2466         case EXPR_BINARY_BITWISE_OR:
2467         case EXPR_BINARY_BITWISE_XOR:
2468         case EXPR_BINARY_SHIFTLEFT:
2469         case EXPR_BINARY_SHIFTRIGHT:
2470         {
2471                 dbg_info *dbgi  = get_dbg_info(&expression->base.source_position);
2472                 ir_node  *left  = expression_to_firm(expression->left);
2473                 ir_node  *right = expression_to_firm(expression->right);
2474                 return create_op(dbgi, expression, left, right);
2475         }
2476         case EXPR_BINARY_LOGICAL_AND:
2477         case EXPR_BINARY_LOGICAL_OR:
2478                 return create_lazy_op(expression);
2479         case EXPR_BINARY_COMMA:
2480                 /* create side effects of left side */
2481                 (void) expression_to_firm(expression->left);
2482                 return _expression_to_firm(expression->right);
2483
2484         case EXPR_BINARY_ADD_ASSIGN:
2485         case EXPR_BINARY_SUB_ASSIGN:
2486         case EXPR_BINARY_MUL_ASSIGN:
2487         case EXPR_BINARY_MOD_ASSIGN:
2488         case EXPR_BINARY_DIV_ASSIGN:
2489         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2490         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2491         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2492         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2493         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2494                 return create_assign_binop(expression);
2495         default:
2496                 panic("TODO binexpr type");
2497         }
2498 }
2499
2500 static ir_node *array_access_addr(const array_access_expression_t *expression)
2501 {
2502         dbg_info *dbgi        = get_dbg_info(&expression->base.source_position);
2503         ir_node  *base_addr   = expression_to_firm(expression->array_ref);
2504         ir_node  *offset      = expression_to_firm(expression->index);
2505         type_t   *ref_type    = skip_typeref(expression->array_ref->base.type);
2506         ir_node  *real_offset = adjust_for_pointer_arithmetic(dbgi, offset, ref_type);
2507         ir_node  *result      = new_d_Add(dbgi, base_addr, real_offset, mode_P_data);
2508
2509         return result;
2510 }
2511
2512 static ir_node *array_access_to_firm(
2513                 const array_access_expression_t *expression)
2514 {
2515         dbg_info *dbgi   = get_dbg_info(&expression->base.source_position);
2516         ir_node  *addr   = array_access_addr(expression);
2517         type_t   *type   = revert_automatic_type_conversion(
2518                         (const expression_t*) expression);
2519         type             = skip_typeref(type);
2520
2521         return deref_address(dbgi, type, addr);
2522 }
2523
2524 static long get_offsetof_offset(const offsetof_expression_t *expression)
2525 {
2526         type_t *orig_type = expression->type;
2527         long    offset    = 0;
2528
2529         designator_t *designator = expression->designator;
2530         for ( ; designator != NULL; designator = designator->next) {
2531                 type_t *type = skip_typeref(orig_type);
2532                 /* be sure the type is constructed */
2533                 (void) get_ir_type(type);
2534
2535                 if (designator->symbol != NULL) {
2536                         assert(is_type_compound(type));
2537                         symbol_t *symbol = designator->symbol;
2538
2539                         compound_t *compound = type->compound.compound;
2540                         entity_t   *iter     = compound->members.entities;
2541                         for ( ; iter != NULL; iter = iter->base.next) {
2542                                 if (iter->base.symbol == symbol) {
2543                                         break;
2544                                 }
2545                         }
2546                         assert(iter != NULL);
2547
2548                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
2549                         assert(iter->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
2550                         offset += get_entity_offset(iter->compound_member.entity);
2551
2552                         orig_type = iter->declaration.type;
2553                 } else {
2554                         expression_t *array_index = designator->array_index;
2555                         assert(designator->array_index != NULL);
2556                         assert(is_type_array(type));
2557
2558                         long index         = fold_constant(array_index);
2559                         ir_type *arr_type  = get_ir_type(type);
2560                         ir_type *elem_type = get_array_element_type(arr_type);
2561                         long     elem_size = get_type_size_bytes(elem_type);
2562
2563                         offset += index * elem_size;
2564
2565                         orig_type = type->array.element_type;
2566                 }
2567         }
2568
2569         return offset;
2570 }
2571
2572 static ir_node *offsetof_to_firm(const offsetof_expression_t *expression)
2573 {
2574         ir_mode  *mode   = get_ir_mode(expression->base.type);
2575         long      offset = get_offsetof_offset(expression);
2576         tarval   *tv     = new_tarval_from_long(offset, mode);
2577         dbg_info *dbgi   = get_dbg_info(&expression->base.source_position);
2578
2579         return new_d_Const(dbgi, tv);
2580 }
2581
2582 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
2583                                      ir_entity *entity, type_t *type);
2584
2585 static ir_node *compound_literal_to_firm(
2586                 const compound_literal_expression_t *expression)
2587 {
2588         type_t *type = expression->type;
2589
2590         /* create an entity on the stack */
2591         ir_type *frame_type = get_irg_frame_type(current_ir_graph);
2592
2593         ident     *const id     = id_unique("CompLit.%u");
2594         ir_type   *const irtype = get_ir_type(type);
2595         dbg_info  *const dbgi   = get_dbg_info(&expression->base.source_position);
2596         ir_entity *const entity = new_d_entity(frame_type, id, irtype, dbgi);
2597         set_entity_ld_ident(entity, id);
2598
2599         set_entity_variability(entity, variability_uninitialized);
2600
2601         /* create initialisation code */
2602         initializer_t *initializer = expression->initializer;
2603         create_local_initializer(initializer, dbgi, entity, type);
2604
2605         /* create a sel for the compound literal address */
2606         ir_node *frame = get_local_frame(entity);
2607         ir_node *sel   = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
2608         return sel;
2609 }
2610
2611 /**
2612  * Transform a sizeof expression into Firm code.
2613  */
2614 static ir_node *sizeof_to_firm(const typeprop_expression_t *expression)
2615 {
2616         type_t *type = expression->type;
2617         if (type == NULL) {
2618                 type = expression->tp_expression->base.type;
2619                 assert(type != NULL);
2620         }
2621
2622         type = skip_typeref(type);
2623         /* § 6.5.3.4 (2) if the type is a VLA, evaluate the expression. */
2624         if (is_type_array(type) && type->array.is_vla
2625                         && expression->tp_expression != NULL) {
2626                 expression_to_firm(expression->tp_expression);
2627         }
2628
2629         return get_type_size(type);
2630 }
2631
2632 /**
2633  * Transform an alignof expression into Firm code.
2634  */
2635 static ir_node *alignof_to_firm(const typeprop_expression_t *expression)
2636 {
2637         type_t *type = expression->type;
2638         if (type == NULL) {
2639                 /* beware: if expression is a variable reference, return the
2640                    alignment of the variable. */
2641                 const expression_t *tp_expression = expression->tp_expression;
2642                 const entity_t     *entity        = expression_is_variable(tp_expression);
2643                 if (entity != NULL) {
2644                         /* TODO: get the alignment of this variable. */
2645                         (void) entity;
2646                 }
2647                 type = tp_expression->base.type;
2648                 assert(type != NULL);
2649         }
2650
2651         ir_mode *const mode = get_ir_mode(expression->base.type);
2652         symconst_symbol sym;
2653         sym.type_p = get_ir_type(type);
2654         return new_SymConst(mode, sym, symconst_type_align);
2655 }
2656
2657 static void init_ir_types(void);
2658
2659 long fold_constant(const expression_t *expression)
2660 {
2661         assert(is_type_valid(skip_typeref(expression->base.type)));
2662
2663         bool constant_folding_old = constant_folding;
2664         constant_folding = true;
2665
2666         init_ir_types();
2667
2668         assert(is_constant_expression(expression));
2669
2670         ir_graph *old_current_ir_graph = current_ir_graph;
2671         if (current_ir_graph == NULL) {
2672                 current_ir_graph = get_const_code_irg();
2673         }
2674
2675         ir_node *cnst = expression_to_firm(expression);
2676         current_ir_graph = old_current_ir_graph;
2677
2678         if (!is_Const(cnst)) {
2679                 panic("couldn't fold constant\n");
2680         }
2681
2682         tarval *tv = get_Const_tarval(cnst);
2683         if (!tarval_is_long(tv)) {
2684                 panic("result of constant folding is not integer\n");
2685         }
2686
2687         constant_folding = constant_folding_old;
2688
2689         return get_tarval_long(tv);
2690 }
2691
2692 static ir_node *conditional_to_firm(const conditional_expression_t *expression)
2693 {
2694         dbg_info *const dbgi = get_dbg_info(&expression->base.source_position);
2695
2696         /* first try to fold a constant condition */
2697         if (is_constant_expression(expression->condition)) {
2698                 long val = fold_constant(expression->condition);
2699                 if (val) {
2700                         expression_t *true_expression = expression->true_expression;
2701                         if (true_expression == NULL)
2702                                 true_expression = expression->condition;
2703                         return expression_to_firm(true_expression);
2704                 } else {
2705                         return expression_to_firm(expression->false_expression);
2706                 }
2707         }
2708
2709         ir_node *cur_block   = get_cur_block();
2710
2711         /* create the true block */
2712         ir_node *true_block  = new_immBlock();
2713
2714         ir_node *true_val = expression->true_expression != NULL ?
2715                 expression_to_firm(expression->true_expression) : NULL;
2716         ir_node *true_jmp = new_Jmp();
2717
2718         /* create the false block */
2719         ir_node *false_block = new_immBlock();
2720
2721         ir_node *false_val = expression_to_firm(expression->false_expression);
2722         ir_node *false_jmp = new_Jmp();
2723
2724         /* create the condition evaluation */
2725         set_cur_block(cur_block);
2726         ir_node *const cond_expr = create_condition_evaluation(expression->condition, true_block, false_block);
2727         if (expression->true_expression == NULL) {
2728                 if (cond_expr != NULL) {
2729                         true_val = cond_expr;
2730                 } else {
2731                         /* Condition ended with a short circuit (&&, ||, !) operation.
2732                          * Generate a "1" as value for the true branch. */
2733                         true_val = new_Const(get_mode_one(mode_Is));
2734                 }
2735         }
2736         mature_immBlock(true_block);
2737         mature_immBlock(false_block);
2738
2739         /* create the common block */
2740         ir_node *in_cf[2] = { true_jmp, false_jmp };
2741         new_Block(2, in_cf);
2742
2743         /* TODO improve static semantics, so either both or no values are NULL */
2744         if (true_val == NULL || false_val == NULL)
2745                 return NULL;
2746
2747         ir_node *in[2] = { true_val, false_val };
2748         ir_mode *mode  = get_irn_mode(true_val);
2749         assert(get_irn_mode(false_val) == mode);
2750         ir_node *val   = new_d_Phi(dbgi, 2, in, mode);
2751
2752         return val;
2753 }
2754
2755 /**
2756  * Returns an IR-node representing the address of a field.
2757  */
2758 static ir_node *select_addr(const select_expression_t *expression)
2759 {
2760         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2761
2762         construct_select_compound(expression);
2763
2764         ir_node *compound_addr = expression_to_firm(expression->compound);
2765
2766         entity_t *entry = expression->compound_entry;
2767         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
2768         assert(entry->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
2769         ir_entity *irentity = entry->compound_member.entity;
2770
2771         assert(irentity != NULL);
2772
2773         ir_node *sel = new_d_simpleSel(dbgi, new_NoMem(), compound_addr, irentity);
2774
2775         return sel;
2776 }
2777
2778 static ir_node *select_to_firm(const select_expression_t *expression)
2779 {
2780         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2781         ir_node  *addr = select_addr(expression);
2782         type_t   *type = revert_automatic_type_conversion(
2783                         (const expression_t*) expression);
2784         type           = skip_typeref(type);
2785
2786         entity_t *entry      = expression->compound_entry;
2787         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
2788         type_t   *entry_type = skip_typeref(entry->declaration.type);
2789
2790         if (entry_type->kind == TYPE_BITFIELD) {
2791                 return bitfield_extract_to_firm(expression, addr);
2792         }
2793
2794         return deref_address(dbgi, type, addr);
2795 }
2796
2797 /* Values returned by __builtin_classify_type. */
2798 typedef enum gcc_type_class
2799 {
2800         no_type_class = -1,
2801         void_type_class,
2802         integer_type_class,
2803         char_type_class,
2804         enumeral_type_class,
2805         boolean_type_class,
2806         pointer_type_class,
2807         reference_type_class,
2808         offset_type_class,
2809         real_type_class,
2810         complex_type_class,
2811         function_type_class,
2812         method_type_class,
2813         record_type_class,
2814         union_type_class,
2815         array_type_class,
2816         string_type_class,
2817         set_type_class,
2818         file_type_class,
2819         lang_type_class
2820 } gcc_type_class;
2821
2822 static ir_node *classify_type_to_firm(const classify_type_expression_t *const expr)
2823 {
2824         type_t *type = expr->type_expression->base.type;
2825
2826         /* FIXME gcc returns different values depending on whether compiling C or C++
2827          * e.g. int x[10] is pointer_type_class in C, but array_type_class in C++ */
2828         gcc_type_class tc;
2829         for (;;) {
2830                 type = skip_typeref(type);
2831                 switch (type->kind) {
2832                         case TYPE_ATOMIC: {
2833                                 const atomic_type_t *const atomic_type = &type->atomic;
2834                                 switch (atomic_type->akind) {
2835                                         /* should not be reached */
2836                                         case ATOMIC_TYPE_INVALID:
2837                                                 tc = no_type_class;
2838                                                 goto make_const;
2839
2840                                         /* gcc cannot do that */
2841                                         case ATOMIC_TYPE_VOID:
2842                                                 tc = void_type_class;
2843                                                 goto make_const;
2844
2845                                         case ATOMIC_TYPE_CHAR:      /* gcc handles this as integer */
2846                                         case ATOMIC_TYPE_SCHAR:     /* gcc handles this as integer */
2847                                         case ATOMIC_TYPE_UCHAR:     /* gcc handles this as integer */
2848                                         case ATOMIC_TYPE_SHORT:
2849                                         case ATOMIC_TYPE_USHORT:
2850                                         case ATOMIC_TYPE_INT:
2851                                         case ATOMIC_TYPE_UINT:
2852                                         case ATOMIC_TYPE_LONG:
2853                                         case ATOMIC_TYPE_ULONG:
2854                                         case ATOMIC_TYPE_LONGLONG:
2855                                         case ATOMIC_TYPE_ULONGLONG:
2856                                         case ATOMIC_TYPE_BOOL:      /* gcc handles this as integer */
2857                                                 tc = integer_type_class;
2858                                                 goto make_const;
2859
2860                                         case ATOMIC_TYPE_FLOAT:
2861                                         case ATOMIC_TYPE_DOUBLE:
2862                                         case ATOMIC_TYPE_LONG_DOUBLE:
2863                                                 tc = real_type_class;
2864                                                 goto make_const;
2865                                 }
2866                                 panic("Unexpected atomic type in classify_type_to_firm().");
2867                         }
2868
2869                         case TYPE_COMPLEX:         tc = complex_type_class; goto make_const;
2870                         case TYPE_IMAGINARY:       tc = complex_type_class; goto make_const;
2871                         case TYPE_BITFIELD:        tc = integer_type_class; goto make_const;
2872                         case TYPE_ARRAY:           /* gcc handles this as pointer */
2873                         case TYPE_FUNCTION:        /* gcc handles this as pointer */
2874                         case TYPE_POINTER:         tc = pointer_type_class; goto make_const;
2875                         case TYPE_COMPOUND_STRUCT: tc = record_type_class;  goto make_const;
2876                         case TYPE_COMPOUND_UNION:  tc = union_type_class;   goto make_const;
2877
2878                         /* gcc handles this as integer */
2879                         case TYPE_ENUM:            tc = integer_type_class; goto make_const;
2880
2881                         /* gcc classifies the referenced type */
2882                         case TYPE_REFERENCE: type = type->reference.refers_to; continue;
2883
2884                         case TYPE_BUILTIN:
2885                         /* typedef/typeof should be skipped already */
2886                         case TYPE_TYPEDEF:
2887                         case TYPE_TYPEOF:
2888                         case TYPE_INVALID:
2889                         case TYPE_ERROR:
2890                                 break;
2891                 }
2892                 panic("unexpected TYPE classify_type_to_firm().");
2893         }
2894
2895 make_const:;
2896         dbg_info *const dbgi = get_dbg_info(&expr->base.source_position);
2897         tarval   *const tv   = new_tarval_from_long(tc, mode_int);
2898         return new_d_Const(dbgi, tv);
2899 }
2900
2901 static ir_node *function_name_to_firm(
2902                 const funcname_expression_t *const expr)
2903 {
2904         switch(expr->kind) {
2905         case FUNCNAME_FUNCTION:
2906         case FUNCNAME_PRETTY_FUNCTION:
2907         case FUNCNAME_FUNCDNAME:
2908                 if (current_function_name == NULL) {
2909                         const source_position_t *const src_pos = &expr->base.source_position;
2910                         const char    *name  = current_function_entity->base.symbol->string;
2911                         const string_t string = { name, strlen(name) + 1 };
2912                         current_function_name = string_to_firm(src_pos, "__func__.%u", &string);
2913                 }
2914                 return current_function_name;
2915         case FUNCNAME_FUNCSIG:
2916                 if (current_funcsig == NULL) {
2917                         const source_position_t *const src_pos = &expr->base.source_position;
2918                         ir_entity *ent = get_irg_entity(current_ir_graph);
2919                         const char *const name = get_entity_ld_name(ent);
2920                         const string_t string = { name, strlen(name) + 1 };
2921                         current_funcsig = string_to_firm(src_pos, "__FUNCSIG__.%u", &string);
2922                 }
2923                 return current_funcsig;
2924         }
2925         panic("Unsupported function name");
2926 }
2927
2928 static ir_node *statement_expression_to_firm(const statement_expression_t *expr)
2929 {
2930         statement_t *statement = expr->statement;
2931
2932         assert(statement->kind == STATEMENT_COMPOUND);
2933         return compound_statement_to_firm(&statement->compound);
2934 }
2935
2936 static ir_node *va_start_expression_to_firm(
2937         const va_start_expression_t *const expr)
2938 {
2939         type_t    *const type        = current_function_entity->declaration.type;
2940         ir_type   *const method_type = get_ir_type(type);
2941         int        const n           = get_method_n_params(method_type) - 1;
2942         ir_entity *const parm_ent    = get_method_value_param_ent(method_type, n);
2943         ir_node   *const arg_base    = get_irg_value_param_base(current_ir_graph);
2944         dbg_info  *const dbgi        = get_dbg_info(&expr->base.source_position);
2945         ir_node   *const no_mem      = new_NoMem();
2946         ir_node   *const arg_sel     =
2947                 new_d_simpleSel(dbgi, no_mem, arg_base, parm_ent);
2948
2949         ir_node   *const cnst        = get_type_size(expr->parameter->base.type);
2950         ir_node   *const add         = new_d_Add(dbgi, arg_sel, cnst, mode_P_data);
2951         set_value_for_expression(expr->ap, add);
2952
2953         return NULL;
2954 }
2955
2956 static ir_node *va_arg_expression_to_firm(const va_arg_expression_t *const expr)
2957 {
2958         type_t       *const type    = expr->base.type;
2959         expression_t *const ap_expr = expr->ap;
2960         ir_node      *const ap_addr = expression_to_addr(ap_expr);
2961         ir_node      *const ap      = get_value_from_lvalue(ap_expr, ap_addr);
2962         dbg_info     *const dbgi    = get_dbg_info(&expr->base.source_position);
2963         ir_node      *const res     = deref_address(dbgi, type, ap);
2964
2965         ir_node      *const cnst    = get_type_size(expr->base.type);
2966         ir_node      *const add     = new_d_Add(dbgi, ap, cnst, mode_P_data);
2967
2968         set_value_for_expression_addr(ap_expr, add, ap_addr);
2969
2970         return res;
2971 }
2972
2973 static ir_node *dereference_addr(const unary_expression_t *const expression)
2974 {
2975         assert(expression->base.kind == EXPR_UNARY_DEREFERENCE);
2976         return expression_to_firm(expression->value);
2977 }
2978
2979 /**
2980  * Returns a IR-node representing an lvalue of the given expression.
2981  */
2982 static ir_node *expression_to_addr(const expression_t *expression)
2983 {
2984         switch(expression->kind) {
2985         case EXPR_REFERENCE:
2986                 return reference_addr(&expression->reference);
2987         case EXPR_ARRAY_ACCESS:
2988                 return array_access_addr(&expression->array_access);
2989         case EXPR_SELECT:
2990                 return select_addr(&expression->select);
2991         case EXPR_CALL:
2992                 return call_expression_to_firm(&expression->call);
2993         case EXPR_UNARY_DEREFERENCE: {
2994                 return dereference_addr(&expression->unary);
2995         }
2996         default:
2997                 break;
2998         }
2999         panic("trying to get address of non-lvalue");
3000 }
3001
3002 static ir_node *builtin_constant_to_firm(
3003                 const builtin_constant_expression_t *expression)
3004 {
3005         ir_mode *mode = get_ir_mode(expression->base.type);
3006         long     v;
3007
3008         if (is_constant_expression(expression->value)) {
3009                 v = 1;
3010         } else {
3011                 v = 0;
3012         }
3013         return new_Const_long(mode, v);
3014 }
3015
3016 static ir_node *builtin_prefetch_to_firm(
3017                 const builtin_prefetch_expression_t *expression)
3018 {
3019         ir_node *adr = expression_to_firm(expression->adr);
3020         /* no Firm support for prefetch yet */
3021         (void) adr;
3022         return NULL;
3023 }
3024
3025 static ir_node *get_label_block(label_t *label)
3026 {
3027         if (label->block != NULL)
3028                 return label->block;
3029
3030         /* beware: might be called from create initializer with current_ir_graph
3031          * set to const_code_irg. */
3032         ir_graph *rem    = current_ir_graph;
3033         current_ir_graph = current_function;
3034
3035         ir_node *old_cur_block = get_cur_block();
3036         ir_node *block         = new_immBlock();
3037         set_cur_block(old_cur_block);
3038
3039         label->block = block;
3040
3041         ARR_APP1(label_t *, all_labels, label);
3042
3043         current_ir_graph = rem;
3044         return block;
3045 }
3046
3047 /**
3048  * Pointer to a label.  This is used for the
3049  * GNU address-of-label extension.
3050  */
3051 static ir_node *label_address_to_firm(
3052                 const label_address_expression_t *label)
3053 {
3054         ir_node    *block = get_label_block(label->label);
3055         ir_label_t  nr    = get_Block_label(block);
3056
3057         if (nr == 0) {
3058                 nr = get_irp_next_label_nr();
3059                 set_Block_label(block, nr);
3060         }
3061         symconst_symbol value;
3062         value.label = nr;
3063         return new_SymConst(mode_P_code, value, symconst_label);
3064 }
3065
3066 static ir_node *builtin_symbol_to_firm(
3067                 const builtin_symbol_expression_t *expression)
3068 {
3069         /* for gcc compatibility we have to produce (dummy) addresses for some
3070          * builtins */
3071         if (warning.other) {
3072                 warningf(&expression->base.source_position,
3073                                  "taking address of builtin '%Y'", expression->symbol);
3074         }
3075
3076         /* simply create a NULL pointer */
3077         ir_mode  *mode = get_ir_mode(type_void_ptr);
3078         ir_node  *res  = new_Const_long(mode, 0);
3079
3080         return res;
3081 }
3082
3083 /**
3084  * creates firm nodes for an expression. The difference between this function
3085  * and expression_to_firm is, that this version might produce mode_b nodes
3086  * instead of mode_Is.
3087  */
3088 static ir_node *_expression_to_firm(const expression_t *expression)
3089 {
3090 #ifndef NDEBUG
3091         if (!constant_folding) {
3092                 assert(!expression->base.transformed);
3093                 ((expression_t*) expression)->base.transformed = true;
3094         }
3095 #endif
3096
3097         switch (expression->kind) {
3098         case EXPR_CHARACTER_CONSTANT:
3099                 return character_constant_to_firm(&expression->conste);
3100         case EXPR_WIDE_CHARACTER_CONSTANT:
3101                 return wide_character_constant_to_firm(&expression->conste);
3102         case EXPR_CONST:
3103                 return const_to_firm(&expression->conste);
3104         case EXPR_STRING_LITERAL:
3105                 return string_literal_to_firm(&expression->string);
3106         case EXPR_WIDE_STRING_LITERAL:
3107                 return wide_string_literal_to_firm(&expression->wide_string);
3108         case EXPR_REFERENCE:
3109                 return reference_expression_to_firm(&expression->reference);
3110         case EXPR_REFERENCE_ENUM_VALUE:
3111                 return reference_expression_enum_value_to_firm(&expression->reference);
3112         case EXPR_CALL:
3113                 return call_expression_to_firm(&expression->call);
3114         EXPR_UNARY_CASES
3115                 return unary_expression_to_firm(&expression->unary);
3116         EXPR_BINARY_CASES
3117                 return binary_expression_to_firm(&expression->binary);
3118         case EXPR_ARRAY_ACCESS:
3119                 return array_access_to_firm(&expression->array_access);
3120         case EXPR_SIZEOF:
3121                 return sizeof_to_firm(&expression->typeprop);
3122         case EXPR_ALIGNOF:
3123                 return alignof_to_firm(&expression->typeprop);
3124         case EXPR_CONDITIONAL:
3125                 return conditional_to_firm(&expression->conditional);
3126         case EXPR_SELECT:
3127                 return select_to_firm(&expression->select);
3128         case EXPR_CLASSIFY_TYPE:
3129                 return classify_type_to_firm(&expression->classify_type);
3130         case EXPR_FUNCNAME:
3131                 return function_name_to_firm(&expression->funcname);
3132         case EXPR_STATEMENT:
3133                 return statement_expression_to_firm(&expression->statement);
3134         case EXPR_VA_START:
3135                 return va_start_expression_to_firm(&expression->va_starte);
3136         case EXPR_VA_ARG:
3137                 return va_arg_expression_to_firm(&expression->va_arge);
3138         case EXPR_BUILTIN_SYMBOL:
3139                 return builtin_symbol_to_firm(&expression->builtin_symbol);
3140         case EXPR_BUILTIN_CONSTANT_P:
3141                 return builtin_constant_to_firm(&expression->builtin_constant);
3142         case EXPR_BUILTIN_PREFETCH:
3143                 return builtin_prefetch_to_firm(&expression->builtin_prefetch);
3144         case EXPR_OFFSETOF:
3145                 return offsetof_to_firm(&expression->offsetofe);
3146         case EXPR_COMPOUND_LITERAL:
3147                 return compound_literal_to_firm(&expression->compound_literal);
3148         case EXPR_LABEL_ADDRESS:
3149                 return label_address_to_firm(&expression->label_address);
3150
3151         case EXPR_UNKNOWN:
3152         case EXPR_INVALID:
3153                 break;
3154         }
3155         panic("invalid expression found");
3156 }
3157
3158 static bool is_builtin_expect(const expression_t *expression)
3159 {
3160         if (expression->kind != EXPR_CALL)
3161                 return false;
3162
3163         expression_t *function = expression->call.function;
3164         if (function->kind != EXPR_BUILTIN_SYMBOL)
3165                 return false;
3166         if (function->builtin_symbol.symbol->ID != T___builtin_expect)
3167                 return false;
3168
3169         return true;
3170 }
3171
3172 static bool produces_mode_b(const expression_t *expression)
3173 {
3174         switch (expression->kind) {
3175         case EXPR_BINARY_EQUAL:
3176         case EXPR_BINARY_NOTEQUAL:
3177         case EXPR_BINARY_LESS:
3178         case EXPR_BINARY_LESSEQUAL:
3179         case EXPR_BINARY_GREATER:
3180         case EXPR_BINARY_GREATEREQUAL:
3181         case EXPR_BINARY_ISGREATER:
3182         case EXPR_BINARY_ISGREATEREQUAL:
3183         case EXPR_BINARY_ISLESS:
3184         case EXPR_BINARY_ISLESSEQUAL:
3185         case EXPR_BINARY_ISLESSGREATER:
3186         case EXPR_BINARY_ISUNORDERED:
3187         case EXPR_UNARY_NOT:
3188                 return true;
3189
3190         case EXPR_CALL:
3191                 if (is_builtin_expect(expression)) {
3192                         expression_t *argument = expression->call.arguments->expression;
3193                         return produces_mode_b(argument);
3194                 }
3195                 return false;
3196         case EXPR_BINARY_COMMA:
3197                 return produces_mode_b(expression->binary.right);
3198
3199         default:
3200                 return false;
3201         }
3202 }
3203
3204 static ir_node *expression_to_firm(const expression_t *expression)
3205 {
3206         if (!produces_mode_b(expression)) {
3207                 ir_node *res = _expression_to_firm(expression);
3208                 assert(res == NULL || get_irn_mode(res) != mode_b);
3209                 return res;
3210         }
3211
3212         if (is_constant_expression(expression)) {
3213                 ir_node *res  = _expression_to_firm(expression);
3214                 ir_mode *mode = get_ir_mode(expression->base.type);
3215                 assert(is_Const(res));
3216                 if (is_Const_null(res)) {
3217                         return new_Const_long(mode, 0);
3218                 } else {
3219                         return new_Const_long(mode, 1);
3220                 }
3221         }
3222
3223         /* we have to produce a 0/1 from the mode_b expression */
3224         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3225         ir_mode  *mode = get_ir_mode(expression->base.type);
3226         return produce_condition_result(expression, mode, dbgi);
3227 }
3228
3229 /**
3230  * create a short-circuit expression evaluation that tries to construct
3231  * efficient control flow structures for &&, || and ! expressions
3232  */
3233 static ir_node *create_condition_evaluation(const expression_t *expression,
3234                                             ir_node *true_block,
3235                                             ir_node *false_block)
3236 {
3237         switch(expression->kind) {
3238         case EXPR_UNARY_NOT: {
3239                 const unary_expression_t *unary_expression = &expression->unary;
3240                 create_condition_evaluation(unary_expression->value, false_block,
3241                                             true_block);
3242                 return NULL;
3243         }
3244         case EXPR_BINARY_LOGICAL_AND: {
3245                 const binary_expression_t *binary_expression = &expression->binary;
3246
3247                 ir_node *cur_block   = get_cur_block();
3248                 ir_node *extra_block = new_immBlock();
3249                 set_cur_block(cur_block);
3250                 create_condition_evaluation(binary_expression->left, extra_block,
3251                                             false_block);
3252                 mature_immBlock(extra_block);
3253                 set_cur_block(extra_block);
3254                 create_condition_evaluation(binary_expression->right, true_block,
3255                                             false_block);
3256                 return NULL;
3257         }
3258         case EXPR_BINARY_LOGICAL_OR: {
3259                 const binary_expression_t *binary_expression = &expression->binary;
3260
3261                 ir_node *cur_block   = get_cur_block();
3262                 ir_node *extra_block = new_immBlock();
3263                 set_cur_block(cur_block);
3264                 create_condition_evaluation(binary_expression->left, true_block,
3265                                             extra_block);
3266                 mature_immBlock(extra_block);
3267                 set_cur_block(extra_block);
3268                 create_condition_evaluation(binary_expression->right, true_block,
3269                                             false_block);
3270                 return NULL;
3271         }
3272         default:
3273                 break;
3274         }
3275
3276         dbg_info *dbgi       = get_dbg_info(&expression->base.source_position);
3277         ir_node  *cond_expr  = _expression_to_firm(expression);
3278         ir_node  *condition  = create_conv(dbgi, cond_expr, mode_b);
3279         ir_node  *cond       = new_d_Cond(dbgi, condition);
3280         ir_node  *true_proj  = new_d_Proj(dbgi, cond, mode_X, pn_Cond_true);
3281         ir_node  *false_proj = new_d_Proj(dbgi, cond, mode_X, pn_Cond_false);
3282
3283         /* set branch prediction info based on __builtin_expect */
3284         if (is_builtin_expect(expression)) {
3285                 call_argument_t *argument = expression->call.arguments->next;
3286                 if (is_constant_expression(argument->expression)) {
3287                         long               cnst = fold_constant(argument->expression);
3288                         cond_jmp_predicate pred;
3289
3290                         if (cnst == 0) {
3291                                 pred = COND_JMP_PRED_FALSE;
3292                         } else {
3293                                 pred = COND_JMP_PRED_TRUE;
3294                         }
3295                         set_Cond_jmp_pred(cond, pred);
3296                 }
3297         }
3298
3299         add_immBlock_pred(true_block, true_proj);
3300         if (false_block != NULL) {
3301                 add_immBlock_pred(false_block, false_proj);
3302         }
3303
3304         set_cur_block(NULL);
3305         return cond_expr;
3306 }
3307
3308
3309 static void create_variable_entity(entity_t *variable,
3310                                    declaration_kind_t declaration_kind,
3311                                    ir_type *parent_type)
3312 {
3313         assert(variable->kind == ENTITY_VARIABLE);
3314         type_t    *const type     = skip_typeref(variable->declaration.type);
3315         ident     *const id       = new_id_from_str(variable->base.symbol->string);
3316         ir_type   *const irtype   = get_ir_type(type);
3317         dbg_info  *const dbgi     = get_dbg_info(&variable->base.source_position);
3318         ir_entity *const irentity = new_d_entity(parent_type, id, irtype, dbgi);
3319
3320         handle_gnu_attributes_ent(irentity, variable);
3321
3322         variable->declaration.kind  = (unsigned char) declaration_kind;
3323         variable->variable.v.entity = irentity;
3324         set_entity_variability(irentity, variability_uninitialized);
3325         set_entity_ld_ident(irentity, create_ld_ident(variable));
3326         if (parent_type == get_tls_type())
3327                 set_entity_allocation(irentity, allocation_automatic);
3328         else if (declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE)
3329                 set_entity_allocation(irentity, allocation_static);
3330
3331         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
3332                 set_entity_volatility(irentity, volatility_is_volatile);
3333         }
3334 }
3335
3336
3337 typedef struct type_path_entry_t type_path_entry_t;
3338 struct type_path_entry_t {
3339         type_t           *type;
3340         ir_initializer_t *initializer;
3341         size_t            index;
3342         entity_t         *compound_entry;
3343 };
3344
3345 typedef struct type_path_t type_path_t;
3346 struct type_path_t {
3347         type_path_entry_t *path;
3348         type_t            *top_type;
3349         bool               invalid;
3350 };
3351
3352 static __attribute__((unused)) void debug_print_type_path(const type_path_t *path)
3353 {
3354         size_t len = ARR_LEN(path->path);
3355
3356         for (size_t i = 0; i < len; ++i) {
3357                 const type_path_entry_t *entry = & path->path[i];
3358
3359                 type_t *type = skip_typeref(entry->type);
3360                 if (is_type_compound(type)) {
3361                         fprintf(stderr, ".%s", entry->compound_entry->base.symbol->string);
3362                 } else if (is_type_array(type)) {
3363                         fprintf(stderr, "[%u]", (unsigned) entry->index);
3364                 } else {
3365                         fprintf(stderr, "-INVALID-");
3366                 }
3367         }
3368         fprintf(stderr, "  (");
3369         print_type(path->top_type);
3370         fprintf(stderr, ")");
3371 }
3372
3373 static type_path_entry_t *get_type_path_top(const type_path_t *path)
3374 {
3375         size_t len = ARR_LEN(path->path);
3376         assert(len > 0);
3377         return & path->path[len-1];
3378 }
3379
3380 static type_path_entry_t *append_to_type_path(type_path_t *path)
3381 {
3382         size_t len = ARR_LEN(path->path);
3383         ARR_RESIZE(type_path_entry_t, path->path, len+1);
3384
3385         type_path_entry_t *result = & path->path[len];
3386         memset(result, 0, sizeof(result[0]));
3387         return result;
3388 }
3389
3390 static size_t get_compound_member_count(const compound_type_t *type)
3391 {
3392         compound_t *compound  = type->compound;
3393         size_t      n_members = 0;
3394         entity_t   *member    = compound->members.entities;
3395         for ( ; member != NULL; member = member->base.next) {
3396                 ++n_members;
3397         }
3398
3399         return n_members;
3400 }
3401
3402 static ir_initializer_t *get_initializer_entry(type_path_t *path)
3403 {
3404         type_t *orig_top_type = path->top_type;
3405         type_t *top_type      = skip_typeref(orig_top_type);
3406
3407         assert(is_type_compound(top_type) || is_type_array(top_type));
3408
3409         if (ARR_LEN(path->path) == 0) {
3410                 return NULL;
3411         } else {
3412                 type_path_entry_t *top         = get_type_path_top(path);
3413                 ir_initializer_t  *initializer = top->initializer;
3414                 return get_initializer_compound_value(initializer, top->index);
3415         }
3416 }
3417
3418 static void descend_into_subtype(type_path_t *path)
3419 {
3420         type_t *orig_top_type = path->top_type;
3421         type_t *top_type      = skip_typeref(orig_top_type);
3422
3423         assert(is_type_compound(top_type) || is_type_array(top_type));
3424
3425         ir_initializer_t *initializer = get_initializer_entry(path);
3426
3427         type_path_entry_t *top = append_to_type_path(path);
3428         top->type              = top_type;
3429
3430         size_t len;
3431
3432         if (is_type_compound(top_type)) {
3433                 compound_t *compound = top_type->compound.compound;
3434                 entity_t   *entry    = compound->members.entities;
3435
3436                 top->compound_entry = entry;
3437                 top->index          = 0;
3438                 len                 = get_compound_member_count(&top_type->compound);
3439                 if (entry != NULL) {
3440                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3441                         path->top_type = entry->declaration.type;
3442                 }
3443         } else {
3444                 assert(is_type_array(top_type));
3445                 assert(top_type->array.size > 0);
3446
3447                 top->index     = 0;
3448                 path->top_type = top_type->array.element_type;
3449                 len            = top_type->array.size;
3450         }
3451         if (initializer == NULL
3452                         || get_initializer_kind(initializer) == IR_INITIALIZER_NULL) {
3453                 initializer = create_initializer_compound(len);
3454                 /* we have to set the entry at the 2nd latest path entry... */
3455                 size_t path_len = ARR_LEN(path->path);
3456                 assert(path_len >= 1);
3457                 if (path_len > 1) {
3458                         type_path_entry_t *entry        = & path->path[path_len-2];
3459                         ir_initializer_t  *tinitializer = entry->initializer;
3460                         set_initializer_compound_value(tinitializer, entry->index,
3461                                                        initializer);
3462                 }
3463         }
3464         top->initializer = initializer;
3465 }
3466
3467 static void ascend_from_subtype(type_path_t *path)
3468 {
3469         type_path_entry_t *top = get_type_path_top(path);
3470
3471         path->top_type = top->type;
3472
3473         size_t len = ARR_LEN(path->path);
3474         ARR_RESIZE(type_path_entry_t, path->path, len-1);
3475 }
3476
3477 static void walk_designator(type_path_t *path, const designator_t *designator)
3478 {
3479         /* designators start at current object type */
3480         ARR_RESIZE(type_path_entry_t, path->path, 1);
3481
3482         for ( ; designator != NULL; designator = designator->next) {
3483                 type_path_entry_t *top         = get_type_path_top(path);
3484                 type_t            *orig_type   = top->type;
3485                 type_t            *type        = skip_typeref(orig_type);
3486
3487                 if (designator->symbol != NULL) {
3488                         assert(is_type_compound(type));
3489                         size_t    index  = 0;
3490                         symbol_t *symbol = designator->symbol;
3491
3492                         compound_t *compound = type->compound.compound;
3493                         entity_t   *iter     = compound->members.entities;
3494                         for ( ; iter != NULL; iter = iter->base.next, ++index) {
3495                                 if (iter->base.symbol == symbol) {
3496                                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
3497                                         break;
3498                                 }
3499                         }
3500                         assert(iter != NULL);
3501
3502                         top->type           = orig_type;
3503                         top->compound_entry = iter;
3504                         top->index          = index;
3505                         orig_type           = iter->declaration.type;
3506                 } else {
3507                         expression_t *array_index = designator->array_index;
3508                         assert(designator->array_index != NULL);
3509                         assert(is_type_array(type));
3510
3511                         long index = fold_constant(array_index);
3512                         assert(index >= 0);
3513 #ifndef NDEBUG
3514                         if (type->array.size_constant) {
3515                                 long array_size = type->array.size;
3516                                 assert(index < array_size);
3517                         }
3518 #endif
3519
3520                         top->type  = orig_type;
3521                         top->index = (size_t) index;
3522                         orig_type  = type->array.element_type;
3523                 }
3524                 path->top_type = orig_type;
3525
3526                 if (designator->next != NULL) {
3527                         descend_into_subtype(path);
3528                 }
3529         }
3530
3531         path->invalid  = false;
3532 }
3533
3534 static void advance_current_object(type_path_t *path)
3535 {
3536         if (path->invalid) {
3537                 /* TODO: handle this... */
3538                 panic("invalid initializer in ast2firm (excessive elements)");
3539         }
3540
3541         type_path_entry_t *top = get_type_path_top(path);
3542
3543         type_t *type = skip_typeref(top->type);
3544         if (is_type_union(type)) {
3545                 top->compound_entry = NULL;
3546         } else if (is_type_struct(type)) {
3547                 entity_t *entry = top->compound_entry;
3548
3549                 top->index++;
3550                 entry               = entry->base.next;
3551                 top->compound_entry = entry;
3552                 if (entry != NULL) {
3553                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3554                         path->top_type = entry->declaration.type;
3555                         return;
3556                 }
3557         } else {
3558                 assert(is_type_array(type));
3559
3560                 top->index++;
3561                 if (!type->array.size_constant || top->index < type->array.size) {
3562                         return;
3563                 }
3564         }
3565
3566         /* we're past the last member of the current sub-aggregate, try if we
3567          * can ascend in the type hierarchy and continue with another subobject */
3568         size_t len = ARR_LEN(path->path);
3569
3570         if (len > 1) {
3571                 ascend_from_subtype(path);
3572                 advance_current_object(path);
3573         } else {
3574                 path->invalid = true;
3575         }
3576 }
3577
3578
3579 static ir_initializer_t *create_ir_initializer(
3580                 const initializer_t *initializer, type_t *type);
3581
3582 static ir_initializer_t *create_ir_initializer_value(
3583                 const initializer_value_t *initializer)
3584 {
3585         if (is_type_compound(initializer->value->base.type)) {
3586                 panic("initializer creation for compounds not implemented yet");
3587         }
3588         ir_node *value = expression_to_firm(initializer->value);
3589         return create_initializer_const(value);
3590 }
3591
3592 /** test wether type can be initialized by a string constant */
3593 static bool is_string_type(type_t *type)
3594 {
3595         type_t *inner;
3596         if (is_type_pointer(type)) {
3597                 inner = skip_typeref(type->pointer.points_to);
3598         } else if(is_type_array(type)) {
3599                 inner = skip_typeref(type->array.element_type);
3600         } else {
3601                 return false;
3602         }
3603
3604         return is_type_integer(inner);
3605 }
3606
3607 static ir_initializer_t *create_ir_initializer_list(
3608                 const initializer_list_t *initializer, type_t *type)
3609 {
3610         type_path_t path;
3611         memset(&path, 0, sizeof(path));
3612         path.top_type = type;
3613         path.path     = NEW_ARR_F(type_path_entry_t, 0);
3614
3615         descend_into_subtype(&path);
3616
3617         for (size_t i = 0; i < initializer->len; ++i) {
3618                 const initializer_t *sub_initializer = initializer->initializers[i];
3619
3620                 if (sub_initializer->kind == INITIALIZER_DESIGNATOR) {
3621                         walk_designator(&path, sub_initializer->designator.designator);
3622                         continue;
3623                 }
3624
3625                 if (sub_initializer->kind == INITIALIZER_VALUE) {
3626                         /* we might have to descend into types until we're at a scalar
3627                          * type */
3628                         while(true) {
3629                                 type_t *orig_top_type = path.top_type;
3630                                 type_t *top_type      = skip_typeref(orig_top_type);
3631
3632                                 if (is_type_scalar(top_type))
3633                                         break;
3634                                 descend_into_subtype(&path);
3635                         }
3636                 } else if (sub_initializer->kind == INITIALIZER_STRING
3637                                 || sub_initializer->kind == INITIALIZER_WIDE_STRING) {
3638                         /* we might have to descend into types until we're at a scalar
3639                          * type */
3640                         while (true) {
3641                                 type_t *orig_top_type = path.top_type;
3642                                 type_t *top_type      = skip_typeref(orig_top_type);
3643
3644                                 if (is_string_type(top_type))
3645                                         break;
3646                                 descend_into_subtype(&path);
3647                         }
3648                 }
3649
3650                 ir_initializer_t *sub_irinitializer
3651                         = create_ir_initializer(sub_initializer, path.top_type);
3652
3653                 size_t path_len = ARR_LEN(path.path);
3654                 assert(path_len >= 1);
3655                 type_path_entry_t *entry        = & path.path[path_len-1];
3656                 ir_initializer_t  *tinitializer = entry->initializer;
3657                 set_initializer_compound_value(tinitializer, entry->index,
3658                                                sub_irinitializer);
3659
3660                 advance_current_object(&path);
3661         }
3662
3663         assert(ARR_LEN(path.path) >= 1);
3664         ir_initializer_t *result = path.path[0].initializer;
3665         DEL_ARR_F(path.path);
3666
3667         return result;
3668 }
3669
3670 static ir_initializer_t *create_ir_initializer_string(
3671                 const initializer_string_t *initializer, type_t *type)
3672 {
3673         type = skip_typeref(type);
3674
3675         size_t            string_len    = initializer->string.size;
3676         assert(type->kind == TYPE_ARRAY);
3677         assert(type->array.size_constant);
3678         size_t            len           = type->array.size;
3679         ir_initializer_t *irinitializer = create_initializer_compound(len);
3680
3681         const char *string = initializer->string.begin;
3682         ir_mode    *mode   = get_ir_mode(type->array.element_type);
3683
3684         for (size_t i = 0; i < len; ++i) {
3685                 char c = 0;
3686                 if (i < string_len)
3687                         c = string[i];
3688
3689                 tarval           *tv = new_tarval_from_long(c, mode);
3690                 ir_initializer_t *char_initializer = create_initializer_tarval(tv);
3691
3692                 set_initializer_compound_value(irinitializer, i, char_initializer);
3693         }
3694
3695         return irinitializer;
3696 }
3697
3698 static ir_initializer_t *create_ir_initializer_wide_string(
3699                 const initializer_wide_string_t *initializer, type_t *type)
3700 {
3701         size_t            string_len    = initializer->string.size;
3702         assert(type->kind == TYPE_ARRAY);
3703         assert(type->array.size_constant);
3704         size_t            len           = type->array.size;
3705         ir_initializer_t *irinitializer = create_initializer_compound(len);
3706
3707         const wchar_rep_t *string = initializer->string.begin;
3708         ir_mode           *mode   = get_type_mode(ir_type_wchar_t);
3709
3710         for (size_t i = 0; i < len; ++i) {
3711                 wchar_rep_t c = 0;
3712                 if (i < string_len) {
3713                         c = string[i];
3714                 }
3715                 tarval *tv = new_tarval_from_long(c, mode);
3716                 ir_initializer_t *char_initializer = create_initializer_tarval(tv);
3717
3718                 set_initializer_compound_value(irinitializer, i, char_initializer);
3719         }
3720
3721         return irinitializer;
3722 }
3723
3724 static ir_initializer_t *create_ir_initializer(
3725                 const initializer_t *initializer, type_t *type)
3726 {
3727         switch(initializer->kind) {
3728                 case INITIALIZER_STRING:
3729                         return create_ir_initializer_string(&initializer->string, type);
3730
3731                 case INITIALIZER_WIDE_STRING:
3732                         return create_ir_initializer_wide_string(&initializer->wide_string,
3733                                                                  type);
3734
3735                 case INITIALIZER_LIST:
3736                         return create_ir_initializer_list(&initializer->list, type);
3737
3738                 case INITIALIZER_VALUE:
3739                         return create_ir_initializer_value(&initializer->value);
3740
3741                 case INITIALIZER_DESIGNATOR:
3742                         panic("unexpected designator initializer found");
3743         }
3744         panic("unknown initializer");
3745 }
3746
3747 static void create_dynamic_null_initializer(ir_type *type, dbg_info *dbgi,
3748                 ir_node *base_addr)
3749 {
3750         if (is_atomic_type(type)) {
3751                 ir_mode *mode = get_type_mode(type);
3752                 tarval  *zero = get_mode_null(mode);
3753                 ir_node *cnst = new_d_Const(dbgi, zero);
3754
3755                 /* TODO: bitfields */
3756                 ir_node *mem    = get_store();
3757                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, cnst);
3758                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
3759                 set_store(proj_m);
3760         } else {
3761                 assert(is_compound_type(type));
3762
3763                 int n_members;
3764                 if (is_Array_type(type)) {
3765                         assert(has_array_upper_bound(type, 0));
3766                         n_members = get_array_upper_bound_int(type, 0);
3767                 } else {
3768                         n_members = get_compound_n_members(type);
3769                 }
3770
3771                 for (int i = 0; i < n_members; ++i) {
3772                         ir_node *addr;
3773                         ir_type *irtype;
3774                         if (is_Array_type(type)) {
3775                                 ir_entity *entity   = get_array_element_entity(type);
3776                                 tarval    *index_tv = new_tarval_from_long(i, mode_uint);
3777                                 ir_node   *cnst     = new_d_Const(dbgi, index_tv);
3778                                 ir_node   *in[1]    = { cnst };
3779                                 irtype = get_array_element_type(type);
3780                                 addr   = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in, entity);
3781                         } else {
3782                                 ir_entity *member = get_compound_member(type, i);
3783
3784                                 irtype = get_entity_type(member);
3785                                 addr   = new_d_simpleSel(dbgi, new_NoMem(), base_addr, member);
3786                         }
3787
3788                         create_dynamic_null_initializer(irtype, dbgi, addr);
3789                 }
3790         }
3791 }
3792
3793 static void create_dynamic_initializer_sub(ir_initializer_t *initializer,
3794                 ir_entity *entity, ir_type *type, dbg_info *dbgi, ir_node *base_addr)
3795 {
3796         switch(get_initializer_kind(initializer)) {
3797         case IR_INITIALIZER_NULL: {
3798                 create_dynamic_null_initializer(type, dbgi, base_addr);
3799                 return;
3800         }
3801         case IR_INITIALIZER_CONST: {
3802                 ir_node *node     = get_initializer_const_value(initializer);
3803                 ir_mode *mode     = get_irn_mode(node);
3804                 ir_type *ent_type = get_entity_type(entity);
3805
3806                 /* is it a bitfield type? */
3807                 if (is_Primitive_type(ent_type) &&
3808                                 get_primitive_base_type(ent_type) != NULL) {
3809                         bitfield_store_to_firm(dbgi, entity, base_addr, node, false);
3810                         return;
3811                 }
3812
3813                 assert(get_type_mode(type) == mode);
3814                 ir_node *mem    = get_store();
3815                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, node);
3816                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
3817                 set_store(proj_m);
3818                 return;
3819         }
3820         case IR_INITIALIZER_TARVAL: {
3821                 tarval  *tv       = get_initializer_tarval_value(initializer);
3822                 ir_mode *mode     = get_tarval_mode(tv);
3823                 ir_node *cnst     = new_d_Const(dbgi, tv);
3824                 ir_type *ent_type = get_entity_type(entity);
3825
3826                 /* is it a bitfield type? */
3827                 if (is_Primitive_type(ent_type) &&
3828                                 get_primitive_base_type(ent_type) != NULL) {
3829                         bitfield_store_to_firm(dbgi, entity, base_addr, cnst, false);
3830                         return;
3831                 }
3832
3833                 assert(get_type_mode(type) == mode);
3834                 ir_node *mem    = get_store();
3835                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, cnst);
3836                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
3837                 set_store(proj_m);
3838                 return;
3839         }
3840         case IR_INITIALIZER_COMPOUND: {
3841                 assert(is_compound_type(type));
3842                 int n_members;
3843                 if (is_Array_type(type)) {
3844                         assert(has_array_upper_bound(type, 0));
3845                         n_members = get_array_upper_bound_int(type, 0);
3846                 } else {
3847                         n_members = get_compound_n_members(type);
3848                 }
3849
3850                 if (get_initializer_compound_n_entries(initializer)
3851                                 != (unsigned) n_members)
3852                         panic("initializer doesn't match compound type");
3853
3854                 for (int i = 0; i < n_members; ++i) {
3855                         ir_node   *addr;
3856                         ir_type   *irtype;
3857                         ir_entity *sub_entity;
3858                         if (is_Array_type(type)) {
3859                                 tarval    *index_tv = new_tarval_from_long(i, mode_uint);
3860                                 ir_node   *cnst     = new_d_Const(dbgi, index_tv);
3861                                 ir_node   *in[1]    = { cnst };
3862                                 irtype     = get_array_element_type(type);
3863                                 sub_entity = get_array_element_entity(type);
3864                                 addr       = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in,
3865                                                        sub_entity);
3866                         } else {
3867                                 sub_entity = get_compound_member(type, i);
3868                                 irtype     = get_entity_type(sub_entity);
3869                                 addr       = new_d_simpleSel(dbgi, new_NoMem(), base_addr,
3870                                                              sub_entity);
3871                         }
3872
3873                         ir_initializer_t *sub_init
3874                                 = get_initializer_compound_value(initializer, i);
3875
3876                         create_dynamic_initializer_sub(sub_init, sub_entity, irtype, dbgi,
3877                                                        addr);
3878                 }
3879                 return;
3880         }
3881         }
3882
3883         panic("invalid IR_INITIALIZER found");
3884 }
3885
3886 static void create_dynamic_initializer(ir_initializer_t *initializer,
3887                 dbg_info *dbgi, ir_entity *entity)
3888 {
3889         ir_node *frame     = get_local_frame(entity);
3890         ir_node *base_addr = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
3891         ir_type *type      = get_entity_type(entity);
3892
3893         create_dynamic_initializer_sub(initializer, entity, type, dbgi, base_addr);
3894 }
3895
3896 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
3897                                      ir_entity *entity, type_t *type)
3898 {
3899         ir_node *memory = get_store();
3900         ir_node *nomem  = new_NoMem();
3901         ir_node *frame  = get_irg_frame(current_ir_graph);
3902         ir_node *addr   = new_d_simpleSel(dbgi, nomem, frame, entity);
3903
3904         if (initializer->kind == INITIALIZER_VALUE) {
3905                 initializer_value_t *initializer_value = &initializer->value;
3906
3907                 ir_node *value = expression_to_firm(initializer_value->value);
3908                 type = skip_typeref(type);
3909                 assign_value(dbgi, addr, type, value);
3910                 return;
3911         }
3912
3913         if (!is_constant_initializer(initializer)) {
3914                 ir_initializer_t *irinitializer
3915                         = create_ir_initializer(initializer, type);
3916
3917                 create_dynamic_initializer(irinitializer, dbgi, entity);
3918                 return;
3919         }
3920
3921         /* create the ir_initializer */
3922         ir_graph *const old_current_ir_graph = current_ir_graph;
3923         current_ir_graph = get_const_code_irg();
3924
3925         ir_initializer_t *irinitializer = create_ir_initializer(initializer, type);
3926
3927         assert(current_ir_graph == get_const_code_irg());
3928         current_ir_graph = old_current_ir_graph;
3929
3930         /* create a "template" entity which is copied to the entity on the stack */
3931         ident     *const id          = id_unique("initializer.%u");
3932         ir_type   *const irtype      = get_ir_type(type);
3933         ir_type   *const global_type = get_glob_type();
3934         ir_entity *const init_entity = new_d_entity(global_type, id, irtype, dbgi);
3935         set_entity_ld_ident(init_entity, id);
3936
3937         set_entity_variability(init_entity, variability_initialized);
3938         set_entity_visibility(init_entity, visibility_local);
3939         set_entity_allocation(init_entity, allocation_static);
3940
3941         set_entity_initializer(init_entity, irinitializer);
3942
3943         ir_node *const src_addr = create_symconst(dbgi, mode_P_data, init_entity);
3944         ir_node *const copyb    = new_d_CopyB(dbgi, memory, addr, src_addr, irtype);
3945
3946         ir_node *const copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M_regular);
3947         set_store(copyb_mem);
3948 }
3949
3950 static void create_initializer_local_variable_entity(entity_t *entity)
3951 {
3952         assert(entity->kind == ENTITY_VARIABLE);
3953         initializer_t *initializer = entity->variable.initializer;
3954         dbg_info      *dbgi        = get_dbg_info(&entity->base.source_position);
3955         ir_entity     *irentity    = entity->variable.v.entity;
3956         type_t        *type        = entity->declaration.type;
3957         create_local_initializer(initializer, dbgi, irentity, type);
3958 }
3959
3960 static void create_variable_initializer(entity_t *entity)
3961 {
3962         assert(entity->kind == ENTITY_VARIABLE);
3963         initializer_t *initializer = entity->variable.initializer;
3964         if (initializer == NULL)
3965                 return;
3966
3967         declaration_kind_t declaration_kind
3968                 = (declaration_kind_t) entity->declaration.kind;
3969         if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY) {
3970                 create_initializer_local_variable_entity(entity);
3971                 return;
3972         }
3973
3974         type_t            *type = entity->declaration.type;
3975         type_qualifiers_t  tq   = get_type_qualifier(type, true);
3976
3977         if (initializer->kind == INITIALIZER_VALUE) {
3978                 initializer_value_t *initializer_value = &initializer->value;
3979                 dbg_info            *dbgi = get_dbg_info(&entity->base.source_position);
3980
3981                 ir_node *value = expression_to_firm(initializer_value->value);
3982                 value = do_strict_conv(dbgi, value);
3983
3984                 if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE) {
3985                         set_value(entity->variable.v.value_number, value);
3986                 } else {
3987                         assert(declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
3988
3989                         ir_entity *irentity = entity->variable.v.entity;
3990
3991                         if (tq & TYPE_QUALIFIER_CONST) {
3992                                 set_entity_variability(irentity, variability_constant);
3993                         } else {
3994                                 set_entity_variability(irentity, variability_initialized);
3995                         }
3996                         set_atomic_ent_value(irentity, value);
3997                 }
3998         } else {
3999                 assert(declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY ||
4000                        declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4001
4002                 ir_entity        *irentity        = entity->variable.v.entity;
4003                 ir_initializer_t *irinitializer
4004                         = create_ir_initializer(initializer, type);
4005
4006                 if (tq & TYPE_QUALIFIER_CONST) {
4007                         set_entity_variability(irentity, variability_constant);
4008                 } else {
4009                         set_entity_variability(irentity, variability_initialized);
4010                 }
4011                 set_entity_initializer(irentity, irinitializer);
4012         }
4013 }
4014
4015 static void create_variable_length_array(entity_t *entity)
4016 {
4017         assert(entity->kind == ENTITY_VARIABLE);
4018         assert(entity->variable.initializer == NULL);
4019
4020         entity->declaration.kind    = DECLARATION_KIND_VARIABLE_LENGTH_ARRAY;
4021         entity->variable.v.vla_base = NULL;
4022
4023         /* TODO: record VLA somewhere so we create the free node when we leave
4024          * it's scope */
4025 }
4026
4027 static void allocate_variable_length_array(entity_t *entity)
4028 {
4029         assert(entity->kind == ENTITY_VARIABLE);
4030         assert(entity->variable.initializer == NULL);
4031         assert(get_cur_block() != NULL);
4032
4033         dbg_info *dbgi      = get_dbg_info(&entity->base.source_position);
4034         type_t   *type      = entity->declaration.type;
4035         ir_type  *el_type   = get_ir_type(type->array.element_type);
4036
4037         /* make sure size_node is calculated */
4038         get_type_size(type);
4039         ir_node  *elems = type->array.size_node;
4040         ir_node  *mem   = get_store();
4041         ir_node  *alloc = new_d_Alloc(dbgi, mem, elems, el_type, stack_alloc);
4042
4043         ir_node  *proj_m = new_d_Proj(dbgi, alloc, mode_M, pn_Alloc_M);
4044         ir_node  *addr   = new_d_Proj(dbgi, alloc, mode_P_data, pn_Alloc_res);
4045         set_store(proj_m);
4046
4047         assert(entity->declaration.kind == DECLARATION_KIND_VARIABLE_LENGTH_ARRAY);
4048         entity->variable.v.vla_base = addr;
4049 }
4050
4051 /**
4052  * Creates a Firm local variable from a declaration.
4053  */
4054 static void create_local_variable(entity_t *entity)
4055 {
4056         assert(entity->kind == ENTITY_VARIABLE);
4057         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4058
4059         bool needs_entity = entity->variable.address_taken;
4060         type_t *type = skip_typeref(entity->declaration.type);
4061
4062         /* is it a variable length array? */
4063         if (is_type_array(type) && !type->array.size_constant) {
4064                 create_variable_length_array(entity);
4065                 return;
4066         } else if (is_type_array(type) || is_type_compound(type)) {
4067                 needs_entity = true;
4068         } else if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
4069                 needs_entity = true;
4070         }
4071
4072         if (needs_entity) {
4073                 ir_type *frame_type = get_irg_frame_type(current_ir_graph);
4074                 create_variable_entity(entity,
4075                                        DECLARATION_KIND_LOCAL_VARIABLE_ENTITY,
4076                                        frame_type);
4077         } else {
4078                 entity->declaration.kind        = DECLARATION_KIND_LOCAL_VARIABLE;
4079                 entity->variable.v.value_number = next_value_number_function;
4080                 set_irg_loc_description(current_ir_graph, next_value_number_function,
4081                                         entity);
4082                 ++next_value_number_function;
4083         }
4084 }
4085
4086 static void create_local_static_variable(entity_t *entity)
4087 {
4088         assert(entity->kind == ENTITY_VARIABLE);
4089         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4090
4091         type_t    *const type     = skip_typeref(entity->declaration.type);
4092         ir_type   *const var_type = entity->variable.thread_local ?
4093                 get_tls_type() : get_glob_type();
4094         ir_type   *const irtype   = get_ir_type(type);
4095         dbg_info  *const dbgi     = get_dbg_info(&entity->base.source_position);
4096
4097         size_t l = strlen(entity->base.symbol->string);
4098         char   buf[l + sizeof(".%u")];
4099         snprintf(buf, sizeof(buf), "%s.%%u", entity->base.symbol->string);
4100         ident     *const id = id_unique(buf);
4101
4102         ir_entity *const irentity = new_d_entity(var_type, id, irtype, dbgi);
4103
4104         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
4105                 set_entity_volatility(irentity, volatility_is_volatile);
4106         }
4107
4108         entity->declaration.kind  = DECLARATION_KIND_GLOBAL_VARIABLE;
4109         entity->variable.v.entity = irentity;
4110         set_entity_ld_ident(irentity, id);
4111         set_entity_variability(irentity, variability_uninitialized);
4112         set_entity_visibility(irentity, visibility_local);
4113         set_entity_allocation(irentity, entity->variable.thread_local ?
4114                 allocation_automatic : allocation_static);
4115
4116         ir_graph *const old_current_ir_graph = current_ir_graph;
4117         current_ir_graph = get_const_code_irg();
4118
4119         create_variable_initializer(entity);
4120
4121         assert(current_ir_graph == get_const_code_irg());
4122         current_ir_graph = old_current_ir_graph;
4123 }
4124
4125
4126
4127 static void return_statement_to_firm(return_statement_t *statement)
4128 {
4129         if (get_cur_block() == NULL)
4130                 return;
4131
4132         dbg_info *dbgi        = get_dbg_info(&statement->base.source_position);
4133         type_t   *type        = current_function_entity->declaration.type;
4134         ir_type  *func_irtype = get_ir_type(type);
4135
4136
4137         ir_node *in[1];
4138         int      in_len;
4139         if (get_method_n_ress(func_irtype) > 0) {
4140                 ir_type *res_type = get_method_res_type(func_irtype, 0);
4141
4142                 if (statement->value != NULL) {
4143                         ir_node *node = expression_to_firm(statement->value);
4144                         node  = do_strict_conv(dbgi, node);
4145                         in[0] = node;
4146                 } else {
4147                         ir_mode *mode;
4148                         if (is_compound_type(res_type)) {
4149                                 mode = mode_P_data;
4150                         } else {
4151                                 mode = get_type_mode(res_type);
4152                         }
4153                         in[0] = new_Unknown(mode);
4154                 }
4155                 in_len = 1;
4156         } else {
4157                 /* build return_value for its side effects */
4158                 if (statement->value != NULL) {
4159                         expression_to_firm(statement->value);
4160                 }
4161                 in_len = 0;
4162         }
4163
4164         ir_node  *store = get_store();
4165         ir_node  *ret   = new_d_Return(dbgi, store, in_len, in);
4166
4167         ir_node *end_block = get_irg_end_block(current_ir_graph);
4168         add_immBlock_pred(end_block, ret);
4169
4170         set_cur_block(NULL);
4171 }
4172
4173 static ir_node *expression_statement_to_firm(expression_statement_t *statement)
4174 {
4175         if (get_cur_block() == NULL)
4176                 return NULL;
4177
4178         return expression_to_firm(statement->expression);
4179 }
4180
4181 static ir_node *compound_statement_to_firm(compound_statement_t *compound)
4182 {
4183         entity_t *entity = compound->scope.entities;
4184         for ( ; entity != NULL; entity = entity->base.next) {
4185                 if (!is_declaration(entity))
4186                         continue;
4187
4188                 create_local_declaration(entity);
4189         }
4190
4191         ir_node     *result    = NULL;
4192         statement_t *statement = compound->statements;
4193         for ( ; statement != NULL; statement = statement->base.next) {
4194                 if (statement->base.next == NULL
4195                                 && statement->kind == STATEMENT_EXPRESSION) {
4196                         result = expression_statement_to_firm(
4197                                         &statement->expression);
4198                         break;
4199                 }
4200                 statement_to_firm(statement);
4201         }
4202
4203         return result;
4204 }
4205
4206 static void create_global_variable(entity_t *entity)
4207 {
4208         assert(entity->kind == ENTITY_VARIABLE);
4209
4210         ir_visibility vis;
4211         switch ((storage_class_tag_t)entity->declaration.storage_class) {
4212                 case STORAGE_CLASS_STATIC: vis = visibility_local;              break;
4213                 case STORAGE_CLASS_EXTERN: vis = visibility_external_allocated; break;
4214                 case STORAGE_CLASS_NONE:   vis = visibility_external_visible;   break;
4215
4216                 default: panic("Invalid storage class for global variable");
4217         }
4218
4219         ir_type *var_type = entity->variable.thread_local ?
4220                 get_tls_type() : get_glob_type();
4221         create_variable_entity(entity,
4222                         DECLARATION_KIND_GLOBAL_VARIABLE, var_type);
4223         set_entity_visibility(entity->variable.v.entity, vis);
4224 }
4225
4226 static void create_local_declaration(entity_t *entity)
4227 {
4228         assert(is_declaration(entity));
4229
4230         /* construct type */
4231         (void) get_ir_type(entity->declaration.type);
4232         if (entity->base.symbol == NULL) {
4233                 return;
4234         }
4235
4236         switch ((storage_class_tag_t) entity->declaration.storage_class) {
4237         case STORAGE_CLASS_STATIC:
4238                 create_local_static_variable(entity);
4239                 return;
4240         case STORAGE_CLASS_EXTERN:
4241                 if (entity->kind == ENTITY_FUNCTION) {
4242                         assert(entity->function.statement == NULL);
4243                         get_function_entity(entity);
4244                 } else {
4245                         create_global_variable(entity);
4246                         create_variable_initializer(entity);
4247                 }
4248                 return;
4249         case STORAGE_CLASS_NONE:
4250         case STORAGE_CLASS_AUTO:
4251         case STORAGE_CLASS_REGISTER:
4252                 if (entity->kind == ENTITY_FUNCTION) {
4253                         if (entity->function.statement != NULL) {
4254                                 get_function_entity(entity);
4255                                 entity->declaration.kind = DECLARATION_KIND_INNER_FUNCTION;
4256                                 enqueue_inner_function(entity);
4257                         } else {
4258                                 get_function_entity(entity);
4259                         }
4260                 } else {
4261                         create_local_variable(entity);
4262                 }
4263                 return;
4264         case STORAGE_CLASS_TYPEDEF:
4265                 break;
4266         }
4267         panic("invalid storage class found");
4268 }
4269
4270 static void initialize_local_declaration(entity_t *entity)
4271 {
4272         if (entity->base.symbol == NULL)
4273                 return;
4274
4275         switch ((declaration_kind_t) entity->declaration.kind) {
4276         case DECLARATION_KIND_LOCAL_VARIABLE:
4277         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY:
4278                 create_variable_initializer(entity);
4279                 return;
4280
4281         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
4282                 allocate_variable_length_array(entity);
4283                 return;
4284
4285         case DECLARATION_KIND_COMPOUND_MEMBER:
4286         case DECLARATION_KIND_GLOBAL_VARIABLE:
4287         case DECLARATION_KIND_FUNCTION:
4288         case DECLARATION_KIND_INNER_FUNCTION:
4289                 return;
4290
4291         case DECLARATION_KIND_PARAMETER:
4292         case DECLARATION_KIND_PARAMETER_ENTITY:
4293                 panic("can't initialize parameters");
4294
4295         case DECLARATION_KIND_UNKNOWN:
4296                 panic("can't initialize unknown declaration");
4297         }
4298         panic("invalid declaration kind");
4299 }
4300
4301 static void declaration_statement_to_firm(declaration_statement_t *statement)
4302 {
4303         entity_t *      entity = statement->declarations_begin;
4304         entity_t *const last   = statement->declarations_end;
4305         if (entity != NULL) {
4306                 for ( ;; entity = entity->base.next) {
4307                         if (is_declaration(entity))
4308                                 initialize_local_declaration(entity);
4309                         if (entity == last)
4310                                 break;
4311                 }
4312         }
4313 }
4314
4315 static void if_statement_to_firm(if_statement_t *statement)
4316 {
4317         ir_node *cur_block = get_cur_block();
4318
4319         ir_node *fallthrough_block = NULL;
4320
4321         /* the true (blocks) */
4322         ir_node *true_block = NULL;
4323         if (statement->true_statement != NULL) {
4324                 true_block = new_immBlock();
4325                 statement_to_firm(statement->true_statement);
4326                 if (get_cur_block() != NULL) {
4327                         ir_node *jmp = new_Jmp();
4328                         if (fallthrough_block == NULL)
4329                                 fallthrough_block = new_immBlock();
4330                         add_immBlock_pred(fallthrough_block, jmp);
4331                 }
4332         }
4333
4334         /* the false (blocks) */
4335         ir_node *false_block = NULL;
4336         if (statement->false_statement != NULL) {
4337                 false_block = new_immBlock();
4338
4339                 statement_to_firm(statement->false_statement);
4340                 if (get_cur_block() != NULL) {
4341                         ir_node *jmp = new_Jmp();
4342                         if (fallthrough_block == NULL)
4343                                 fallthrough_block = new_immBlock();
4344                         add_immBlock_pred(fallthrough_block, jmp);
4345                 }
4346         }
4347
4348         /* create the condition */
4349         if (cur_block != NULL) {
4350                 if (true_block == NULL || false_block == NULL) {
4351                         if (fallthrough_block == NULL)
4352                                 fallthrough_block = new_immBlock();
4353                         if (true_block == NULL)
4354                                 true_block = fallthrough_block;
4355                         if (false_block == NULL)
4356                                 false_block = fallthrough_block;
4357                 }
4358
4359                 set_cur_block(cur_block);
4360                 create_condition_evaluation(statement->condition, true_block,
4361                                             false_block);
4362         }
4363
4364         mature_immBlock(true_block);
4365         if (false_block != fallthrough_block && false_block != NULL) {
4366                 mature_immBlock(false_block);
4367         }
4368         if (fallthrough_block != NULL) {
4369                 mature_immBlock(fallthrough_block);
4370         }
4371
4372         set_cur_block(fallthrough_block);
4373 }
4374
4375 static void while_statement_to_firm(while_statement_t *statement)
4376 {
4377         ir_node *jmp = NULL;
4378         if (get_cur_block() != NULL) {
4379                 jmp = new_Jmp();
4380         }
4381
4382         /* create the header block */
4383         ir_node *header_block = new_immBlock();
4384         if (jmp != NULL) {
4385                 add_immBlock_pred(header_block, jmp);
4386         }
4387
4388         /* the loop body */
4389         ir_node *old_continue_label = continue_label;
4390         ir_node *old_break_label    = break_label;
4391         continue_label              = header_block;
4392         break_label                 = NULL;
4393
4394         ir_node *body_block = new_immBlock();
4395         statement_to_firm(statement->body);
4396         ir_node *false_block = break_label;
4397
4398         assert(continue_label == header_block);
4399         continue_label = old_continue_label;
4400         break_label    = old_break_label;
4401
4402         if (get_cur_block() != NULL) {
4403                 jmp = new_Jmp();
4404                 add_immBlock_pred(header_block, jmp);
4405         }
4406
4407         /* shortcut for while(true) */
4408         if (is_constant_expression(statement->condition)
4409                         && fold_constant(statement->condition) != 0) {
4410                 set_cur_block(header_block);
4411                 ir_node *header_jmp = new_Jmp();
4412                 add_immBlock_pred(body_block, header_jmp);
4413
4414                 keep_alive(body_block);
4415                 keep_all_memory(body_block);
4416                 set_cur_block(body_block);
4417         } else {
4418                 if (false_block == NULL) {
4419                         false_block = new_immBlock();
4420                 }
4421
4422                 /* create the condition */
4423                 set_cur_block(header_block);
4424
4425                 create_condition_evaluation(statement->condition, body_block,
4426                                             false_block);
4427         }
4428
4429         mature_immBlock(body_block);
4430         mature_immBlock(header_block);
4431         if (false_block != NULL) {
4432                 mature_immBlock(false_block);
4433         }
4434
4435         set_cur_block(false_block);
4436 }
4437
4438 static void do_while_statement_to_firm(do_while_statement_t *statement)
4439 {
4440         ir_node *jmp = NULL;
4441         if (get_cur_block() != NULL) {
4442                 jmp = new_Jmp();
4443         }
4444
4445         /* create the header block */
4446         ir_node *header_block = new_immBlock();
4447
4448         /* the loop body */
4449         ir_node *body_block = new_immBlock();
4450         if (jmp != NULL) {
4451                 add_immBlock_pred(body_block, jmp);
4452         }
4453
4454         ir_node *old_continue_label = continue_label;
4455         ir_node *old_break_label    = break_label;
4456         continue_label              = header_block;
4457         break_label                 = NULL;
4458
4459         statement_to_firm(statement->body);
4460         ir_node *false_block = break_label;
4461
4462         assert(continue_label == header_block);
4463         continue_label = old_continue_label;
4464         break_label    = old_break_label;
4465
4466         if (get_cur_block() != NULL) {
4467                 ir_node *body_jmp = new_Jmp();
4468                 add_immBlock_pred(header_block, body_jmp);
4469                 mature_immBlock(header_block);
4470         }
4471
4472         if (false_block == NULL) {
4473                 false_block = new_immBlock();
4474         }
4475
4476         /* create the condition */
4477         set_cur_block(header_block);
4478
4479         create_condition_evaluation(statement->condition, body_block, false_block);
4480         mature_immBlock(body_block);
4481         mature_immBlock(header_block);
4482         if (false_block != NULL) {
4483                 mature_immBlock(false_block);
4484         }
4485
4486         set_cur_block(false_block);
4487 }
4488
4489 static void for_statement_to_firm(for_statement_t *statement)
4490 {
4491         ir_node *jmp = NULL;
4492
4493         /* create declarations */
4494         entity_t *entity = statement->scope.entities;
4495         for ( ; entity != NULL; entity = entity->base.next) {
4496                 if (!is_declaration(entity))
4497                         continue;
4498
4499                 create_local_declaration(entity);
4500         }
4501
4502         if (get_cur_block() != NULL) {
4503                 entity = statement->scope.entities;
4504                 for ( ; entity != NULL; entity = entity->base.next) {
4505                         if (!is_declaration(entity))
4506                                 continue;
4507
4508                         initialize_local_declaration(entity);
4509                 }
4510
4511                 if (statement->initialisation != NULL) {
4512                         expression_to_firm(statement->initialisation);
4513                 }
4514
4515                 jmp = new_Jmp();
4516         }
4517
4518
4519         /* create the step block */
4520         ir_node *const step_block = new_immBlock();
4521         if (statement->step != NULL) {
4522                 expression_to_firm(statement->step);
4523         }
4524         ir_node *const step_jmp = new_Jmp();
4525
4526         /* create the header block */
4527         ir_node *const header_block = new_immBlock();
4528         if (jmp != NULL) {
4529                 add_immBlock_pred(header_block, jmp);
4530         }
4531         add_immBlock_pred(header_block, step_jmp);
4532
4533         /* the false block */
4534         ir_node *const false_block = new_immBlock();
4535
4536         /* the loop body */
4537         ir_node * body_block;
4538         if (statement->body != NULL) {
4539                 ir_node *const old_continue_label = continue_label;
4540                 ir_node *const old_break_label    = break_label;
4541                 continue_label = step_block;
4542                 break_label    = false_block;
4543
4544                 body_block = new_immBlock();
4545                 statement_to_firm(statement->body);
4546
4547                 assert(continue_label == step_block);
4548                 assert(break_label    == false_block);
4549                 continue_label = old_continue_label;
4550                 break_label    = old_break_label;
4551
4552                 if (get_cur_block() != NULL) {
4553                         jmp = new_Jmp();
4554                         add_immBlock_pred(step_block, jmp);
4555                 }
4556         } else {
4557                 body_block = step_block;
4558         }
4559
4560         /* create the condition */
4561         set_cur_block(header_block);
4562         if (statement->condition != NULL) {
4563                 create_condition_evaluation(statement->condition, body_block,
4564                                             false_block);
4565         } else {
4566                 keep_alive(header_block);
4567                 keep_all_memory(header_block);
4568                 jmp = new_Jmp();
4569                 add_immBlock_pred(body_block, jmp);
4570         }
4571
4572         mature_immBlock(body_block);
4573         mature_immBlock(false_block);
4574         mature_immBlock(step_block);
4575         mature_immBlock(header_block);
4576         mature_immBlock(false_block);
4577
4578         set_cur_block(false_block);
4579 }
4580
4581 static void create_jump_statement(const statement_t *statement,
4582                                   ir_node *target_block)
4583 {
4584         if (get_cur_block() == NULL)
4585                 return;
4586
4587         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
4588         ir_node  *jump = new_d_Jmp(dbgi);
4589         add_immBlock_pred(target_block, jump);
4590
4591         set_cur_block(NULL);
4592 }
4593
4594 static ir_node *get_break_label(void)
4595 {
4596         if (break_label == NULL) {
4597                 ir_node *cur_block = get_cur_block();
4598                 break_label = new_immBlock();
4599                 set_cur_block(cur_block);
4600         }
4601         return break_label;
4602 }
4603
4604 static void switch_statement_to_firm(switch_statement_t *statement)
4605 {
4606         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
4607
4608         ir_node *expression  = expression_to_firm(statement->expression);
4609         ir_node *cond        = new_d_Cond(dbgi, expression);
4610
4611         set_cur_block(NULL);
4612
4613         ir_node *const old_switch_cond       = current_switch_cond;
4614         ir_node *const old_break_label       = break_label;
4615         const bool     old_saw_default_label = saw_default_label;
4616         saw_default_label                    = false;
4617         current_switch_cond                  = cond;
4618         break_label                          = NULL;
4619         switch_statement_t *const old_switch = current_switch;
4620         current_switch                       = statement;
4621
4622         /* determine a free number for the default label */
4623         unsigned long num_cases = 0;
4624         long def_nr = 0;
4625         for (case_label_statement_t *l = statement->first_case; l != NULL; l = l->next) {
4626                 if (l->expression == NULL) {
4627                         /* default case */
4628                         continue;
4629                 }
4630                 if (l->last_case >= l->first_case)
4631                         num_cases += l->last_case - l->first_case + 1;
4632                 if (l->last_case > def_nr)
4633                         def_nr = l->last_case;
4634         }
4635
4636         if (def_nr == INT_MAX) {
4637                 /* Bad: an overflow will occurr, we cannot be sure that the
4638                  * maximum + 1 is a free number. Scan the values a second
4639                  * time to find a free number.
4640                  */
4641                 unsigned char *bits = xmalloc((num_cases + 7) >> 3);
4642
4643                 memset(bits, 0, (num_cases + 7) >> 3);
4644                 for (case_label_statement_t *l = statement->first_case; l != NULL; l = l->next) {
4645                         if (l->expression == NULL) {
4646                                 /* default case */
4647                                 continue;
4648                         }
4649                         unsigned long start = l->first_case > 0 ? (unsigned long)l->first_case : 0;
4650                         if (start < num_cases && l->last_case >= 0) {
4651                                 unsigned long end  = (unsigned long)l->last_case < num_cases ?
4652                                         (unsigned long)l->last_case : num_cases - 1;
4653                                 for (unsigned long cns = start; cns <= end; ++cns) {
4654                                         bits[cns >> 3] |= (1 << (cns & 7));
4655                                 }
4656                         }
4657                 }
4658                 /* We look at the first num_cases constants:
4659                  * Either they are densed, so we took the last (num_cases)
4660                  * one, or they are non densed, so we will find one free
4661                  * there...
4662                  */
4663                 unsigned long i;
4664                 for (i = 0; i < num_cases; ++i)
4665                         if ((bits[i >> 3] & (1 << (i & 7))) == 0)
4666                                 break;
4667
4668                 free(bits);
4669                 def_nr = i;
4670         } else {
4671                 ++def_nr;
4672         }
4673         statement->default_proj_nr = def_nr;
4674
4675         if (statement->body != NULL) {
4676                 statement_to_firm(statement->body);
4677         }
4678
4679         if (get_cur_block() != NULL) {
4680                 ir_node *jmp = new_Jmp();
4681                 add_immBlock_pred(get_break_label(), jmp);
4682         }
4683
4684         if (!saw_default_label) {
4685                 set_cur_block(get_nodes_block(cond));
4686                 ir_node *const proj = new_d_defaultProj(dbgi, cond,
4687                                                         statement->default_proj_nr);
4688                 add_immBlock_pred(get_break_label(), proj);
4689         }
4690
4691         if (break_label != NULL) {
4692                 mature_immBlock(break_label);
4693         }
4694         set_cur_block(break_label);
4695
4696         assert(current_switch_cond == cond);
4697         current_switch      = old_switch;
4698         current_switch_cond = old_switch_cond;
4699         break_label         = old_break_label;
4700         saw_default_label   = old_saw_default_label;
4701 }
4702
4703 static void case_label_to_firm(const case_label_statement_t *statement)
4704 {
4705         if (statement->is_empty_range)
4706                 return;
4707
4708         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
4709
4710         ir_node *const fallthrough = (get_cur_block() == NULL ? NULL : new_Jmp());
4711
4712         ir_node *proj;
4713         ir_node *old_block = get_nodes_block(current_switch_cond);
4714         ir_node *block     = new_immBlock();
4715
4716         set_cur_block(old_block);
4717         if (statement->expression != NULL) {
4718                 long pn     = statement->first_case;
4719                 long end_pn = statement->last_case;
4720                 assert(pn <= end_pn);
4721                 /* create jumps for all cases in the given range */
4722                 do {
4723                         proj = new_d_Proj(dbgi, current_switch_cond, mode_X, pn);
4724                         add_immBlock_pred(block, proj);
4725                 } while(pn++ < end_pn);
4726         } else {
4727                 saw_default_label = true;
4728                 proj = new_d_defaultProj(dbgi, current_switch_cond,
4729                                          current_switch->default_proj_nr);
4730
4731                 add_immBlock_pred(block, proj);
4732         }
4733
4734         if (fallthrough != NULL) {
4735                 add_immBlock_pred(block, fallthrough);
4736         }
4737         mature_immBlock(block);
4738         set_cur_block(block);
4739
4740         if (statement->statement != NULL) {
4741                 statement_to_firm(statement->statement);
4742         }
4743 }
4744
4745 static void label_to_firm(const label_statement_t *statement)
4746 {
4747         ir_node *block = get_label_block(statement->label);
4748
4749         if (get_cur_block() != NULL) {
4750                 ir_node *jmp = new_Jmp();
4751                 add_immBlock_pred(block, jmp);
4752         }
4753
4754         set_cur_block(block);
4755         keep_alive(block);
4756         keep_all_memory(block);
4757
4758         if (statement->statement != NULL) {
4759                 statement_to_firm(statement->statement);
4760         }
4761 }
4762
4763 static void goto_to_firm(const goto_statement_t *statement)
4764 {
4765         if (get_cur_block() == NULL)
4766                 return;
4767
4768         if (statement->expression) {
4769                 ir_node  *irn  = expression_to_firm(statement->expression);
4770                 dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
4771                 ir_node  *ijmp = new_d_IJmp(dbgi, irn);
4772
4773                 set_irn_link(ijmp, ijmp_list);
4774                 ijmp_list = ijmp;
4775         } else {
4776                 ir_node *block = get_label_block(statement->label);
4777                 ir_node *jmp   = new_Jmp();
4778                 add_immBlock_pred(block, jmp);
4779         }
4780         set_cur_block(NULL);
4781 }
4782
4783 static void asm_statement_to_firm(const asm_statement_t *statement)
4784 {
4785         bool needs_memory = false;
4786
4787         if (statement->is_volatile) {
4788                 needs_memory = true;
4789         }
4790
4791         size_t         n_clobbers = 0;
4792         asm_clobber_t *clobber    = statement->clobbers;
4793         for ( ; clobber != NULL; clobber = clobber->next) {
4794                 const char *clobber_str = clobber->clobber.begin;
4795
4796                 if (!be_is_valid_clobber(clobber_str)) {
4797                         errorf(&statement->base.source_position,
4798                                    "invalid clobber '%s' specified", clobber->clobber);
4799                         continue;
4800                 }
4801
4802                 if (strcmp(clobber_str, "memory") == 0) {
4803                         needs_memory = true;
4804                         continue;
4805                 }
4806
4807                 ident *id = new_id_from_str(clobber_str);
4808                 obstack_ptr_grow(&asm_obst, id);
4809                 ++n_clobbers;
4810         }
4811         assert(obstack_object_size(&asm_obst) == n_clobbers * sizeof(ident*));
4812         ident **clobbers = NULL;
4813         if (n_clobbers > 0) {
4814                 clobbers = obstack_finish(&asm_obst);
4815         }
4816
4817         size_t n_inputs  = 0;
4818         asm_argument_t *argument = statement->inputs;
4819         for ( ; argument != NULL; argument = argument->next)
4820                 n_inputs++;
4821         size_t n_outputs = 0;
4822         argument = statement->outputs;
4823         for ( ; argument != NULL; argument = argument->next)
4824                 n_outputs++;
4825
4826         unsigned next_pos = 0;
4827
4828         ir_node *ins[n_inputs + n_outputs + 1];
4829         size_t   in_size = 0;
4830
4831         ir_asm_constraint tmp_in_constraints[n_outputs];
4832
4833         const expression_t *out_exprs[n_outputs];
4834         ir_node            *out_addrs[n_outputs];
4835         size_t              out_size = 0;
4836
4837         argument = statement->outputs;
4838         for ( ; argument != NULL; argument = argument->next) {
4839                 const char *constraints = argument->constraints.begin;
4840                 asm_constraint_flags_t asm_flags
4841                         = be_parse_asm_constraints(constraints);
4842
4843                 if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
4844                         warningf(&statement->base.source_position,
4845                                "some constraints in '%s' are not supported", constraints);
4846                 }
4847                 if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
4848                         errorf(&statement->base.source_position,
4849                                "some constraints in '%s' are invalid", constraints);
4850                         continue;
4851                 }
4852                 if (! (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE)) {
4853                         errorf(&statement->base.source_position,
4854                                "no write flag specified for output constraints '%s'",
4855                                constraints);
4856                         continue;
4857                 }
4858
4859                 unsigned pos = next_pos++;
4860                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
4861                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
4862                         expression_t *expr = argument->expression;
4863                         ir_node      *addr = expression_to_addr(expr);
4864                         /* in+output, construct an artifical same_as constraint on the
4865                          * input */
4866                         if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_READ) {
4867                                 char     buf[64];
4868                                 ir_node *value = get_value_from_lvalue(expr, addr);
4869
4870                                 snprintf(buf, sizeof(buf), "%u", pos);
4871
4872                                 ir_asm_constraint constraint;
4873                                 constraint.pos              = pos;
4874                                 constraint.constraint       = new_id_from_str(buf);
4875                                 constraint.mode             = get_ir_mode(expr->base.type);
4876                                 tmp_in_constraints[in_size] = constraint;
4877                                 ins[in_size] = value;
4878
4879                                 ++in_size;
4880                         }
4881
4882                         out_exprs[out_size] = expr;
4883                         out_addrs[out_size] = addr;
4884                         ++out_size;
4885                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
4886                         /* pure memory ops need no input (but we have to make sure we
4887                          * attach to the memory) */
4888                         assert(! (asm_flags &
4889                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
4890                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
4891                         needs_memory = true;
4892
4893                         /* we need to attach the address to the inputs */
4894                         expression_t *expr = argument->expression;
4895
4896                         ir_asm_constraint constraint;
4897                         constraint.pos              = pos;
4898                         constraint.constraint       = new_id_from_str(constraints);
4899                         constraint.mode             = NULL;
4900                         tmp_in_constraints[in_size] = constraint;
4901
4902                         ins[in_size]          = expression_to_addr(expr);
4903                         ++in_size;
4904                         continue;
4905                 } else {
4906                         errorf(&statement->base.source_position,
4907                                "only modifiers but no place set in constraints '%s'",
4908                                constraints);
4909                         continue;
4910                 }
4911
4912                 ir_asm_constraint constraint;
4913                 constraint.pos        = pos;
4914                 constraint.constraint = new_id_from_str(constraints);
4915                 constraint.mode       = get_ir_mode(argument->expression->base.type);
4916
4917                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
4918         }
4919         assert(obstack_object_size(&asm_obst)
4920                         == out_size * sizeof(ir_asm_constraint));
4921         ir_asm_constraint *output_constraints = obstack_finish(&asm_obst);
4922
4923
4924         obstack_grow(&asm_obst, tmp_in_constraints,
4925                      in_size * sizeof(tmp_in_constraints[0]));
4926         /* find and count input and output arguments */
4927         argument = statement->inputs;
4928         for ( ; argument != NULL; argument = argument->next) {
4929                 const char *constraints = argument->constraints.begin;
4930                 asm_constraint_flags_t asm_flags
4931                         = be_parse_asm_constraints(constraints);
4932
4933                 if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
4934                         errorf(&statement->base.source_position,
4935                                "some constraints in '%s' are not supported", constraints);
4936                         continue;
4937                 }
4938                 if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
4939                         errorf(&statement->base.source_position,
4940                                "some constraints in '%s' are invalid", constraints);
4941                         continue;
4942                 }
4943                 if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE) {
4944                         errorf(&statement->base.source_position,
4945                                "write flag specified for input constraints '%s'",
4946                                constraints);
4947                         continue;
4948                 }
4949
4950                 ir_node *input;
4951                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
4952                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
4953                         /* we can treat this as "normal" input */
4954                         input = expression_to_firm(argument->expression);
4955                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
4956                         /* pure memory ops need no input (but we have to make sure we
4957                          * attach to the memory) */
4958                         assert(! (asm_flags &
4959                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
4960                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
4961                         needs_memory = true;
4962                         input = expression_to_addr(argument->expression);
4963                 } else {
4964                         errorf(&statement->base.source_position,
4965                                "only modifiers but no place set in constraints '%s'",
4966                                constraints);
4967                         continue;
4968                 }
4969
4970                 ir_asm_constraint constraint;
4971                 constraint.pos        = next_pos++;
4972                 constraint.constraint = new_id_from_str(constraints);
4973                 constraint.mode       = get_irn_mode(input);
4974
4975                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
4976                 ins[in_size++] = input;
4977         }
4978
4979         if (needs_memory) {
4980                 ir_asm_constraint constraint;
4981                 constraint.pos        = next_pos++;
4982                 constraint.constraint = new_id_from_str("");
4983                 constraint.mode       = mode_M;
4984
4985                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
4986                 ins[in_size++] = get_store();
4987         }
4988
4989         assert(obstack_object_size(&asm_obst)
4990                         == in_size * sizeof(ir_asm_constraint));
4991         ir_asm_constraint *input_constraints = obstack_finish(&asm_obst);
4992
4993         /* create asm node */
4994         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
4995
4996         ident *asm_text = new_id_from_str(statement->asm_text.begin);
4997
4998         ir_node *node = new_d_ASM(dbgi, in_size, ins, input_constraints,
4999                                   out_size, output_constraints,
5000                                   n_clobbers, clobbers, asm_text);
5001
5002         if (statement->is_volatile) {
5003                 set_irn_pinned(node, op_pin_state_pinned);
5004         } else {
5005                 set_irn_pinned(node, op_pin_state_floats);
5006         }
5007
5008         /* create output projs & connect them */
5009         if (needs_memory) {
5010                 ir_node *projm = new_Proj(node, mode_M, out_size+1);
5011                 set_store(projm);
5012         }
5013
5014         size_t i;
5015         for (i = 0; i < out_size; ++i) {
5016                 const expression_t *out_expr = out_exprs[i];
5017                 long                pn       = i;
5018                 ir_mode            *mode     = get_ir_mode(out_expr->base.type);
5019                 ir_node            *proj     = new_Proj(node, mode, pn);
5020                 ir_node            *addr     = out_addrs[i];
5021
5022                 set_value_for_expression_addr(out_expr, proj, addr);
5023         }
5024 }
5025
5026 static void     ms_try_statement_to_firm(ms_try_statement_t *statement) {
5027         statement_to_firm(statement->try_statement);
5028         warningf(&statement->base.source_position, "structured exception handling ignored");
5029 }
5030
5031 static void     leave_statement_to_firm(leave_statement_t *statement) {
5032         errorf(&statement->base.source_position, "__leave not supported yet");
5033 }
5034
5035 /**
5036  * Transform a statement.
5037  */
5038 static void statement_to_firm(statement_t *statement)
5039 {
5040 #ifndef NDEBUG
5041         assert(!statement->base.transformed);
5042         statement->base.transformed = true;
5043 #endif
5044
5045         switch (statement->kind) {
5046         case STATEMENT_INVALID:
5047                 panic("invalid statement found");
5048         case STATEMENT_EMPTY:
5049                 /* nothing */
5050                 return;
5051         case STATEMENT_COMPOUND:
5052                 compound_statement_to_firm(&statement->compound);
5053                 return;
5054         case STATEMENT_RETURN:
5055                 return_statement_to_firm(&statement->returns);
5056                 return;
5057         case STATEMENT_EXPRESSION:
5058                 expression_statement_to_firm(&statement->expression);
5059                 return;
5060         case STATEMENT_IF:
5061                 if_statement_to_firm(&statement->ifs);
5062                 return;
5063         case STATEMENT_WHILE:
5064                 while_statement_to_firm(&statement->whiles);
5065                 return;
5066         case STATEMENT_DO_WHILE:
5067                 do_while_statement_to_firm(&statement->do_while);
5068                 return;
5069         case STATEMENT_DECLARATION:
5070                 declaration_statement_to_firm(&statement->declaration);
5071                 return;
5072         case STATEMENT_BREAK:
5073                 create_jump_statement(statement, get_break_label());
5074                 return;
5075         case STATEMENT_CONTINUE:
5076                 create_jump_statement(statement, continue_label);
5077                 return;
5078         case STATEMENT_SWITCH:
5079                 switch_statement_to_firm(&statement->switchs);
5080                 return;
5081         case STATEMENT_CASE_LABEL:
5082                 case_label_to_firm(&statement->case_label);
5083                 return;
5084         case STATEMENT_FOR:
5085                 for_statement_to_firm(&statement->fors);
5086                 return;
5087         case STATEMENT_LABEL:
5088                 label_to_firm(&statement->label);
5089                 return;
5090         case STATEMENT_LOCAL_LABEL:
5091                 /* local labels transform the semantics of labels while parsing
5092                  * they don't need any special treatment here */
5093                 return;
5094         case STATEMENT_GOTO:
5095                 goto_to_firm(&statement->gotos);
5096                 return;
5097         case STATEMENT_ASM:
5098                 asm_statement_to_firm(&statement->asms);
5099                 return;
5100         case STATEMENT_MS_TRY:
5101                 ms_try_statement_to_firm(&statement->ms_try);
5102                 return;
5103         case STATEMENT_LEAVE:
5104                 leave_statement_to_firm(&statement->leave);
5105                 return;
5106         }
5107         panic("Statement not implemented\n");
5108 }
5109
5110 static int count_local_variables(const entity_t *entity,
5111                                  const entity_t *const last)
5112 {
5113         int count = 0;
5114         for (; entity != NULL; entity = entity->base.next) {
5115                 type_t *type;
5116                 bool    address_taken;
5117
5118                 if (entity->kind == ENTITY_VARIABLE) {
5119                         type          = skip_typeref(entity->declaration.type);
5120                         address_taken = entity->variable.address_taken;
5121                 } else if (entity->kind == ENTITY_PARAMETER) {
5122                         type          = skip_typeref(entity->declaration.type);
5123                         address_taken = entity->parameter.address_taken;
5124                 } else {
5125                         continue;
5126                 }
5127
5128                 if (!address_taken && is_type_scalar(type))
5129                         ++count;
5130
5131                 if (entity == last)
5132                         break;
5133         }
5134         return count;
5135 }
5136
5137 static void count_local_variables_in_stmt(statement_t *stmt, void *const env)
5138 {
5139         int *const count = env;
5140
5141         switch (stmt->kind) {
5142         case STATEMENT_DECLARATION: {
5143                 const declaration_statement_t *const decl_stmt = &stmt->declaration;
5144                 *count += count_local_variables(decl_stmt->declarations_begin,
5145                                 decl_stmt->declarations_end);
5146                 break;
5147         }
5148
5149         case STATEMENT_FOR:
5150                 *count += count_local_variables(stmt->fors.scope.entities, NULL);
5151                 break;
5152
5153         default:
5154                 break;
5155         }
5156 }
5157
5158 static int get_function_n_local_vars(entity_t *entity)
5159 {
5160         int count = 0;
5161
5162         /* count parameters */
5163         count += count_local_variables(entity->function.parameters.entities, NULL);
5164
5165         /* count local variables declared in body */
5166         walk_statements(entity->function.statement, count_local_variables_in_stmt,
5167                         &count);
5168         return count;
5169 }
5170
5171 static void initialize_function_parameters(entity_t *entity)
5172 {
5173         assert(entity->kind == ENTITY_FUNCTION);
5174         ir_graph *irg             = current_ir_graph;
5175         ir_node  *args            = get_irg_args(irg);
5176         ir_node  *start_block     = get_irg_start_block(irg);
5177         ir_type  *function_irtype = get_ir_type(entity->declaration.type);
5178
5179         int       n         = 0;
5180         entity_t *parameter = entity->function.parameters.entities;
5181         for ( ; parameter != NULL; parameter = parameter->base.next, ++n) {
5182                 assert(parameter->kind == ENTITY_PARAMETER);
5183                 assert(parameter->declaration.kind == DECLARATION_KIND_UNKNOWN);
5184                 type_t *type = skip_typeref(parameter->declaration.type);
5185
5186                 bool needs_entity = parameter->parameter.address_taken;
5187                 assert(!is_type_array(type));
5188                 if (is_type_compound(type)) {
5189                         needs_entity = true;
5190                 }
5191
5192                 if (needs_entity) {
5193                         ir_entity *entity = get_method_value_param_ent(function_irtype, n);
5194                         ident     *id     = new_id_from_str(parameter->base.symbol->string);
5195                         set_entity_ident(entity, id);
5196
5197                         parameter->declaration.kind
5198                                 = DECLARATION_KIND_PARAMETER_ENTITY;
5199                         parameter->parameter.v.entity = entity;
5200                         continue;
5201                 }
5202
5203                 ir_type *param_irtype = get_method_param_type(function_irtype, n);
5204                 ir_mode *param_mode   = get_type_mode(param_irtype);
5205
5206                 long     pn    = n;
5207                 ir_node *value = new_r_Proj(irg, start_block, args, param_mode, pn);
5208
5209                 ir_mode *mode = get_ir_mode(type);
5210                 value = create_conv(NULL, value, mode);
5211                 value = do_strict_conv(NULL, value);
5212
5213                 parameter->declaration.kind         = DECLARATION_KIND_PARAMETER;
5214                 parameter->parameter.v.value_number = next_value_number_function;
5215                 set_irg_loc_description(current_ir_graph, next_value_number_function,
5216                                         parameter);
5217                 ++next_value_number_function;
5218
5219                 set_value(parameter->parameter.v.value_number, value);
5220         }
5221 }
5222
5223 /**
5224  * Handle additional decl modifiers for IR-graphs
5225  *
5226  * @param irg            the IR-graph
5227  * @param dec_modifiers  additional modifiers
5228  */
5229 static void handle_decl_modifier_irg(ir_graph_ptr irg, decl_modifiers_t decl_modifiers)
5230 {
5231         if (decl_modifiers & DM_NORETURN) {
5232                 /* TRUE if the declaration includes the Microsoft
5233                    __declspec(noreturn) specifier. */
5234                 set_irg_additional_property(irg, mtp_property_noreturn);
5235         }
5236         if (decl_modifiers & DM_NOTHROW) {
5237                 /* TRUE if the declaration includes the Microsoft
5238                    __declspec(nothrow) specifier. */
5239                 set_irg_additional_property(irg, mtp_property_nothrow);
5240         }
5241         if (decl_modifiers & DM_NAKED) {
5242                 /* TRUE if the declaration includes the Microsoft
5243                    __declspec(naked) specifier. */
5244                 set_irg_additional_property(irg, mtp_property_naked);
5245         }
5246         if (decl_modifiers & DM_FORCEINLINE) {
5247                 /* TRUE if the declaration includes the
5248                    Microsoft __forceinline specifier. */
5249                 set_irg_inline_property(irg, irg_inline_forced);
5250         }
5251         if (decl_modifiers & DM_NOINLINE) {
5252                 /* TRUE if the declaration includes the Microsoft
5253                    __declspec(noinline) specifier. */
5254                 set_irg_inline_property(irg, irg_inline_forbidden);
5255         }
5256 }
5257
5258 static void add_function_pointer(ir_type *segment, ir_entity *method,
5259                                  const char *unique_template)
5260 {
5261         ir_type   *method_type  = get_entity_type(method);
5262         ident     *id           = id_unique(unique_template);
5263         ir_type   *ptr_type     = new_type_pointer(id, method_type, mode_P_code);
5264
5265         ident     *ide          = id_unique(unique_template);
5266         ir_entity *ptr          = new_entity(segment, ide, ptr_type);
5267         ir_graph  *irg          = get_const_code_irg();
5268         ir_node   *val          = new_rd_SymConst_addr_ent(NULL, irg, mode_P_code,
5269                                                            method, NULL);
5270
5271         set_entity_compiler_generated(ptr, 1);
5272         set_entity_variability(ptr, variability_constant);
5273         set_atomic_ent_value(ptr, val);
5274 }
5275
5276 /**
5277  * Generate possible IJmp branches to a given label block.
5278  */
5279 static void gen_ijmp_branches(ir_node *block) {
5280         ir_node *ijmp;
5281         for (ijmp = ijmp_list; ijmp != NULL; ijmp = get_irn_link(ijmp)) {
5282                 add_immBlock_pred(block, ijmp);
5283         }
5284 }
5285
5286 /**
5287  * Create code for a function.
5288  */
5289 static void create_function(entity_t *entity)
5290 {
5291         assert(entity->kind == ENTITY_FUNCTION);
5292         ir_entity *function_entity = get_function_entity(entity);
5293
5294         if (entity->function.statement == NULL)
5295                 return;
5296
5297         if (entity->declaration.modifiers & DM_CONSTRUCTOR) {
5298                 ir_type *segment = get_segment_type(IR_SEGMENT_CONSTRUCTORS);
5299                 add_function_pointer(segment, function_entity, "constructor_ptr.%u");
5300         }
5301         if (entity->declaration.modifiers & DM_DESTRUCTOR) {
5302                 ir_type *segment = get_segment_type(IR_SEGMENT_DESTRUCTORS);
5303                 add_function_pointer(segment, function_entity, "destructor_ptr.%u");
5304         }
5305
5306         current_function_entity = entity;
5307         current_function_name   = NULL;
5308         current_funcsig         = NULL;
5309
5310         assert(all_labels == NULL);
5311         all_labels = NEW_ARR_F(label_t *, 0);
5312         ijmp_list  = NULL;
5313
5314         int       n_local_vars = get_function_n_local_vars(entity);
5315         ir_graph *irg          = new_ir_graph(function_entity, n_local_vars);
5316
5317         ir_graph *old_current_function = current_function;
5318         current_function = irg;
5319
5320         set_irg_fp_model(irg, firm_opt.fp_model);
5321         tarval_enable_fp_ops((firm_opt.fp_model & fp_strict_algebraic) == 0);
5322         set_irn_dbg_info(get_irg_start_block(irg), get_entity_dbg_info(function_entity));
5323
5324         ir_node *first_block = get_cur_block();
5325
5326         /* set inline flags */
5327         if (entity->function.is_inline)
5328                 set_irg_inline_property(irg, irg_inline_recomended);
5329         handle_decl_modifier_irg(irg, entity->declaration.modifiers);
5330
5331         next_value_number_function = 0;
5332         initialize_function_parameters(entity);
5333
5334         statement_to_firm(entity->function.statement);
5335
5336         ir_node *end_block = get_irg_end_block(irg);
5337
5338         /* do we have a return statement yet? */
5339         if (get_cur_block() != NULL) {
5340                 type_t *type = skip_typeref(entity->declaration.type);
5341                 assert(is_type_function(type));
5342                 const function_type_t *func_type   = &type->function;
5343                 const type_t          *return_type
5344                         = skip_typeref(func_type->return_type);
5345
5346                 ir_node *ret;
5347                 if (is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
5348                         ret = new_Return(get_store(), 0, NULL);
5349                 } else {
5350                         ir_mode *mode;
5351                         if (is_type_scalar(return_type)) {
5352                                 mode = get_ir_mode(func_type->return_type);
5353                         } else {
5354                                 mode = mode_P_data;
5355                         }
5356
5357                         ir_node *in[1];
5358                         /* §5.1.2.2.3 main implicitly returns 0 */
5359                         if (is_main(entity)) {
5360                                 in[0] = new_Const(get_mode_null(mode));
5361                         } else {
5362                                 in[0] = new_Unknown(mode);
5363                         }
5364                         ret = new_Return(get_store(), 1, in);
5365                 }
5366                 add_immBlock_pred(end_block, ret);
5367         }
5368
5369         bool has_computed_gotos = false;
5370         for (int i = ARR_LEN(all_labels) - 1; i >= 0; --i) {
5371                 label_t *label = all_labels[i];
5372                 if (label->address_taken) {
5373                         gen_ijmp_branches(label->block);
5374                         has_computed_gotos = true;
5375                 }
5376                 mature_immBlock(label->block);
5377         }
5378         if (has_computed_gotos) {
5379                 /* if we have computed goto's in the function, we cannot inline it */
5380                 if (get_irg_inline_property(irg) >= irg_inline_recomended) {
5381                         warningf(&entity->base.source_position,
5382                                  "function '%Y' can never be inlined because it contains a computed goto",
5383                                  entity->base.symbol);
5384                 }
5385                 set_irg_inline_property(irg, irg_inline_forbidden);
5386         }
5387
5388         DEL_ARR_F(all_labels);
5389         all_labels = NULL;
5390
5391         mature_immBlock(first_block);
5392         mature_immBlock(end_block);
5393
5394         irg_finalize_cons(irg);
5395
5396         /* finalize the frame type */
5397         ir_type *frame_type = get_irg_frame_type(irg);
5398         int      n          = get_compound_n_members(frame_type);
5399         int      align_all  = 4;
5400         int      offset     = 0;
5401         for (int i = 0; i < n; ++i) {
5402                 ir_entity *entity      = get_compound_member(frame_type, i);
5403                 ir_type   *entity_type = get_entity_type(entity);
5404
5405                 int align = get_type_alignment_bytes(entity_type);
5406                 if (align > align_all)
5407                         align_all = align;
5408                 int misalign = 0;
5409                 if (align > 0) {
5410                         misalign  = offset % align;
5411                         if (misalign > 0) {
5412                                 offset += align - misalign;
5413                         }
5414                 }
5415
5416                 set_entity_offset(entity, offset);
5417                 offset += get_type_size_bytes(entity_type);
5418         }
5419         set_type_size_bytes(frame_type, offset);
5420         set_type_alignment_bytes(frame_type, align_all);
5421
5422         irg_vrfy(irg);
5423         current_function = old_current_function;
5424
5425         /* create inner functions */
5426         entity_t *inner;
5427         for (inner = next_inner_function(); inner != NULL;
5428              inner = next_inner_function()) {
5429                 create_function(inner);
5430         }
5431 }
5432
5433 static void scope_to_firm(scope_t *scope)
5434 {
5435         /* first pass: create declarations */
5436         entity_t *entity = scope->entities;
5437         for ( ; entity != NULL; entity = entity->base.next) {
5438                 if (entity->base.symbol == NULL)
5439                         continue;
5440
5441                 if (entity->kind == ENTITY_FUNCTION) {
5442                         get_function_entity(entity);
5443                 } else if (entity->kind == ENTITY_VARIABLE) {
5444                         create_global_variable(entity);
5445                 }
5446         }
5447
5448         /* second pass: create code/initializers */
5449         entity = scope->entities;
5450         for ( ; entity != NULL; entity = entity->base.next) {
5451                 if (entity->base.symbol == NULL)
5452                         continue;
5453
5454                 if (entity->kind == ENTITY_FUNCTION) {
5455                         create_function(entity);
5456                 } else if (entity->kind == ENTITY_VARIABLE) {
5457                         assert(entity->declaration.kind
5458                                         == DECLARATION_KIND_GLOBAL_VARIABLE);
5459                         current_ir_graph = get_const_code_irg();
5460                         create_variable_initializer(entity);
5461                 }
5462         }
5463 }
5464
5465 void init_ast2firm(void)
5466 {
5467         obstack_init(&asm_obst);
5468         init_atomic_modes();
5469
5470         /* OS option must be set to the backend */
5471         switch (firm_opt.os_support) {
5472         case OS_SUPPORT_MINGW:
5473                 create_ld_ident = create_name_win32;
5474                 break;
5475         case OS_SUPPORT_LINUX:
5476                 create_ld_ident = create_name_linux_elf;
5477                 break;
5478         case OS_SUPPORT_MACHO:
5479                 create_ld_ident = create_name_macho;
5480                 break;
5481         default:
5482                 panic("unexpected OS support mode");
5483         }
5484
5485         /* create idents for all known runtime functions */
5486         for (size_t i = 0; i < sizeof(rts_data) / sizeof(rts_data[0]); ++i) {
5487                 rts_idents[i] = new_id_from_str(rts_data[i].name);
5488         }
5489
5490         entitymap_init(&entitymap);
5491 }
5492
5493 static void init_ir_types(void)
5494 {
5495         static int ir_types_initialized = 0;
5496         if (ir_types_initialized)
5497                 return;
5498         ir_types_initialized = 1;
5499
5500         ir_type_int        = get_ir_type(type_int);
5501         ir_type_const_char = get_ir_type(type_const_char);
5502         ir_type_wchar_t    = get_ir_type(type_wchar_t);
5503         ir_type_void       = get_ir_type(type_void);
5504 }
5505
5506 void exit_ast2firm(void)
5507 {
5508         entitymap_destroy(&entitymap);
5509         obstack_free(&asm_obst, NULL);
5510 }
5511
5512 static void global_asm_to_firm(statement_t *s)
5513 {
5514         for (; s != NULL; s = s->base.next) {
5515                 assert(s->kind == STATEMENT_ASM);
5516
5517                 char const *const text = s->asms.asm_text.begin;
5518                 size_t            size = s->asms.asm_text.size;
5519
5520                 /* skip the last \0 */
5521                 if (text[size - 1] == '\0')
5522                         --size;
5523
5524                 ident *const id = new_id_from_chars(text, size);
5525                 add_irp_asm(id);
5526         }
5527 }
5528
5529 void translation_unit_to_firm(translation_unit_t *unit)
5530 {
5531         /* just to be sure */
5532         continue_label           = NULL;
5533         break_label              = NULL;
5534         current_switch_cond      = NULL;
5535         current_translation_unit = unit;
5536
5537         init_ir_types();
5538         inner_functions = NEW_ARR_F(entity_t *, 0);
5539
5540         scope_to_firm(&unit->scope);
5541         global_asm_to_firm(unit->global_asm);
5542
5543         DEL_ARR_F(inner_functions);
5544         inner_functions  = NULL;
5545
5546         current_ir_graph         = NULL;
5547         current_translation_unit = NULL;
5548 }