nsz Git - cparser/blob - ast2firm.c

   1 /*
   2  * This file is part of cparser.
   3  * Copyright (C) 2007-2009 Matthias Braun <matze@braunis.de>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  18  * 02111-1307, USA.
  19  */
  20 #include <config.h>
  21
  22 #include <assert.h>
  23 #include <string.h>
  24 #include <stdbool.h>
  25 #include <limits.h>
  26
  27 #include <libfirm/firm.h>
  28 #include <libfirm/adt/obst.h>
  29 #include <libfirm/be.h>
  30
  31 #include "ast2firm.h"
  32
  33 #include "adt/error.h"
  34 #include "adt/array.h"
  35 #include "adt/strutil.h"
  36 #include "adt/util.h"
  37 #include "symbol_t.h"
  38 #include "token_t.h"
  39 #include "type_t.h"
  40 #include "ast_t.h"
  41 #include "entity_t.h"
  42 #include "parser.h"
  43 #include "diagnostic.h"
  44 #include "lang_features.h"
  45 #include "types.h"
  46 #include "type_hash.h"
  47 #include "mangle.h"
  48 #include "walk.h"
  49 #include "warning.h"
  50 #include "printer.h"
  51 #include "entitymap_t.h"
  52 #include "driver/firm_opt.h"
  53
  54 typedef struct trampoline_region trampoline_region;
  55 struct trampoline_region {
  56         ir_entity        *function;    /**< The function that is called by this trampoline */
  57         ir_entity        *region;      /**< created region for the trampoline */
  58 };
  59
  60 fp_model_t firm_fp_model = fp_model_precise;
  61
  62 static const backend_params *be_params;
  63
  64 static ir_type *ir_type_char;
  65 static ir_type *ir_type_const_char;
  66 static ir_type *ir_type_wchar_t;
  67
  68 /* architecture specific floating point arithmetic mode (if any) */
  69 static ir_mode *mode_float_arithmetic;
  70
  71 /* alignment of stack parameters */
  72 static unsigned stack_param_align;
  73
  74 static int        next_value_number_function;
  75 static ir_node   *continue_label;
  76 static ir_node   *break_label;
  77 static ir_node   *current_switch;
  78 static bool       saw_default_label;
  79 static label_t  **all_labels;
  80 static entity_t **inner_functions;
  81 static ir_node   *ijmp_list;
  82 static bool       constant_folding;
  83
  84 static const entity_t     *current_function_entity;
  85 static ir_node            *current_function_name;
  86 static ir_node            *current_funcsig;
  87 static ir_graph           *current_function;
  88 static translation_unit_t *current_translation_unit;
  89 static trampoline_region  *current_trampolines;
  90 static ir_type            *current_outer_frame;
  91 static ir_node            *current_static_link;
  92 static ir_entity          *current_vararg_entity;
  93
  94 static entitymap_t  entitymap;
  95
  96 static struct obstack asm_obst;
  97
  98 typedef enum declaration_kind_t {
  99         DECLARATION_KIND_UNKNOWN,
 100         DECLARATION_KIND_VARIABLE_LENGTH_ARRAY,
 101         DECLARATION_KIND_GLOBAL_VARIABLE,
 102         DECLARATION_KIND_LOCAL_VARIABLE,
 103         DECLARATION_KIND_LOCAL_VARIABLE_ENTITY,
 104         DECLARATION_KIND_PARAMETER,
 105         DECLARATION_KIND_PARAMETER_ENTITY,
 106         DECLARATION_KIND_FUNCTION,
 107         DECLARATION_KIND_COMPOUND_MEMBER,
 108         DECLARATION_KIND_INNER_FUNCTION
 109 } declaration_kind_t;
 110
 111 static ir_type *get_ir_type_incomplete(type_t *type);
 112
 113 static void enqueue_inner_function(entity_t *entity)
 114 {
 115         if (inner_functions == NULL)
 116                 inner_functions = NEW_ARR_F(entity_t *, 0);
 117         ARR_APP1(entity_t*, inner_functions, entity);
 118 }
 119
 120 static ir_node *uninitialized_local_var(ir_graph *irg, ir_mode *mode, int pos)
 121 {
 122         const entity_t *entity = get_irg_loc_description(irg, pos);
 123
 124         if (entity != NULL) {
 125                 source_position_t const *const pos = &entity->base.source_position;
 126                 warningf(WARN_UNINITIALIZED, pos, "'%N' might be used uninitialized", entity);
 127         }
 128         return new_r_Unknown(irg, mode);
 129 }
 130
 131 static const char *dbg_retrieve(const dbg_info *dbg, unsigned *line)
 132 {
 133         const source_position_t *pos = (const source_position_t*) dbg;
 134         if (pos == NULL)
 135                 return NULL;
 136         if (line != NULL)
 137                 *line = pos->lineno;
 138         return pos->input_name;
 139 }
 140
 141 static dbg_info *get_dbg_info(const source_position_t *pos)
 142 {
 143         return (dbg_info*) pos;
 144 }
 145
 146 static void dbg_print_type_dbg_info(char *buffer, size_t buffer_size,
 147                                     const type_dbg_info *dbg)
 148 {
 149         assert(dbg != NULL);
 150         print_to_buffer(buffer, buffer_size);
 151         const type_t *type = (const type_t*) dbg;
 152         print_type(type);
 153         finish_print_to_buffer();
 154 }
 155
 156 static type_dbg_info *get_type_dbg_info_(const type_t *type)
 157 {
 158         return (type_dbg_info*) type;
 159 }
 160
 161 /* is the current block a reachable one? */
 162 static bool currently_reachable(void)
 163 {
 164         ir_node *const block = get_cur_block();
 165         return block != NULL && !is_Bad(block);
 166 }
 167
 168 static void set_unreachable_now(void)
 169 {
 170         set_cur_block(NULL);
 171 }
 172
 173 ir_mode *atomic_modes[ATOMIC_TYPE_LAST+1];
 174
 175 static ir_node *_expression_to_firm(const expression_t *expression);
 176 static ir_node *expression_to_firm(const expression_t *expression);
 177 static void create_local_declaration(entity_t *entity);
 178
 179 static unsigned decide_modulo_shift(unsigned type_size)
 180 {
 181         if (architecture_modulo_shift == 0)
 182                 return 0;
 183         if (type_size < architecture_modulo_shift)
 184                 return architecture_modulo_shift;
 185         return type_size;
 186 }
 187
 188 static ir_mode *init_atomic_ir_mode(atomic_type_kind_t kind)
 189 {
 190         unsigned flags = get_atomic_type_flags(kind);
 191         unsigned size  = get_atomic_type_size(kind);
 192         if ((flags & ATOMIC_TYPE_FLAG_FLOAT)
 193             && !(flags & ATOMIC_TYPE_FLAG_COMPLEX)) {
 194                 if (size == 4) {
 195                         return get_modeF();
 196                 } else if (size == 8) {
 197                         return get_modeD();
 198                 } else {
 199                         panic("unexpected kind");
 200                 }
 201         } else if (flags & ATOMIC_TYPE_FLAG_INTEGER) {
 202                 char            name[64];
 203                 unsigned        bit_size     = size * 8;
 204                 bool            is_signed    = (flags & ATOMIC_TYPE_FLAG_SIGNED) != 0;
 205                 unsigned        modulo_shift = decide_modulo_shift(bit_size);
 206
 207                 snprintf(name, sizeof(name), "%s%u", is_signed ? "I" : "U", bit_size);
 208                 return new_int_mode(name, irma_twos_complement, bit_size, is_signed,
 209                                     modulo_shift);
 210         }
 211
 212         return NULL;
 213 }
 214
 215 /**
 216  * Initialises the atomic modes depending on the machine size.
 217  */
 218 static void init_atomic_modes(void)
 219 {
 220         atomic_modes[ATOMIC_TYPE_VOID] = mode_ANY;
 221         for (int i = 0; i <= ATOMIC_TYPE_LAST; ++i) {
 222                 if (atomic_modes[i] != NULL)
 223                         continue;
 224                 atomic_modes[i] = init_atomic_ir_mode((atomic_type_kind_t) i);
 225         }
 226 }
 227
 228 ir_mode *get_atomic_mode(atomic_type_kind_t kind)
 229 {
 230         assert(kind <= ATOMIC_TYPE_LAST);
 231         return atomic_modes[kind];
 232 }
 233
 234 static ir_node *get_vla_size(array_type_t *const type)
 235 {
 236         ir_node *size_node = type->size_node;
 237         if (size_node == NULL) {
 238                 size_node = expression_to_firm(type->size_expression);
 239                 type->size_node = size_node;
 240         }
 241         return size_node;
 242 }
 243
 244 static unsigned count_parameters(const function_type_t *function_type)
 245 {
 246         unsigned count = 0;
 247
 248         function_parameter_t *parameter = function_type->parameters;
 249         for ( ; parameter != NULL; parameter = parameter->next) {
 250                 ++count;
 251         }
 252
 253         return count;
 254 }
 255
 256 /**
 257  * Creates a Firm type for an atomic type
 258  */
 259 static ir_type *create_atomic_type(atomic_type_kind_t akind, const type_t *type)
 260 {
 261         ir_mode        *mode      = atomic_modes[akind];
 262         type_dbg_info  *dbgi      = get_type_dbg_info_(type);
 263         ir_type        *irtype    = new_d_type_primitive(mode, dbgi);
 264         il_alignment_t  alignment = get_atomic_type_alignment(akind);
 265
 266         set_type_size_bytes(irtype, get_atomic_type_size(akind));
 267         set_type_alignment_bytes(irtype, alignment);
 268
 269         return irtype;
 270 }
 271
 272 /**
 273  * Creates a Firm type for a complex type
 274  */
 275 static ir_type *create_complex_type(const atomic_type_t *type)
 276 {
 277         atomic_type_kind_t  kind = type->akind;
 278         ir_mode            *mode = atomic_modes[kind];
 279         ident              *id   = get_mode_ident(mode);
 280
 281         (void) id;
 282
 283         /* FIXME: finish the array */
 284         return NULL;
 285 }
 286
 287 /**
 288  * Creates a Firm type for an imaginary type
 289  */
 290 static ir_type *create_imaginary_type(const atomic_type_t *type)
 291 {
 292         return create_atomic_type(type->akind, (const type_t*)type);
 293 }
 294
 295 /**
 296  * return type of a parameter (and take transparent union gnu extension into
 297  * account)
 298  */
 299 static type_t *get_parameter_type(type_t *orig_type)
 300 {
 301         type_t *type = skip_typeref(orig_type);
 302         if (is_type_union(type)
 303                         && get_type_modifiers(orig_type) & DM_TRANSPARENT_UNION) {
 304                 compound_t *compound = type->compound.compound;
 305                 type                 = compound->members.entities->declaration.type;
 306         }
 307
 308         return type;
 309 }
 310
 311 static ir_type *create_method_type(const function_type_t *function_type, bool for_closure)
 312 {
 313         type_t        *return_type  = skip_typeref(function_type->return_type);
 314
 315         int            n_parameters = count_parameters(function_type)
 316                                        + (for_closure ? 1 : 0);
 317         int            n_results    = is_type_void(return_type) ? 0 : 1;
 318         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) function_type);
 319         ir_type       *irtype       = new_d_type_method(n_parameters, n_results, dbgi);
 320
 321         if (!is_type_void(return_type)) {
 322                 ir_type *restype = get_ir_type(return_type);
 323                 set_method_res_type(irtype, 0, restype);
 324         }
 325
 326         function_parameter_t *parameter = function_type->parameters;
 327         int                   n         = 0;
 328         if (for_closure) {
 329                 ir_type *p_irtype = get_ir_type(type_void_ptr);
 330                 set_method_param_type(irtype, n, p_irtype);
 331                 ++n;
 332         }
 333         for ( ; parameter != NULL; parameter = parameter->next) {
 334                 type_t  *type     = get_parameter_type(parameter->type);
 335                 ir_type *p_irtype = get_ir_type(type);
 336                 set_method_param_type(irtype, n, p_irtype);
 337                 ++n;
 338         }
 339
 340         bool is_variadic = function_type->variadic;
 341
 342         if (is_variadic)
 343                 set_method_variadicity(irtype, variadicity_variadic);
 344
 345         unsigned cc = get_method_calling_convention(irtype);
 346         switch (function_type->calling_convention) {
 347         case CC_DEFAULT: /* unspecified calling convention, equal to one of the other, typically cdecl */
 348         case CC_CDECL:
 349 is_cdecl:
 350                 set_method_calling_convention(irtype, SET_CDECL(cc));
 351                 break;
 352
 353         case CC_STDCALL:
 354                 if (is_variadic)
 355                         goto is_cdecl;
 356
 357                 /* only non-variadic function can use stdcall, else use cdecl */
 358                 set_method_calling_convention(irtype, SET_STDCALL(cc));
 359                 break;
 360
 361         case CC_FASTCALL:
 362                 if (is_variadic)
 363                         goto is_cdecl;
 364                 /* only non-variadic function can use fastcall, else use cdecl */
 365                 set_method_calling_convention(irtype, SET_FASTCALL(cc));
 366                 break;
 367
 368         case CC_THISCALL:
 369                 /* Hmm, leave default, not accepted by the parser yet. */
 370                 break;
 371         }
 372
 373         if (for_closure)
 374                 set_method_calling_convention(irtype, get_method_calling_convention(irtype) | cc_this_call);
 375
 376         const decl_modifiers_t modifiers = function_type->modifiers;
 377         if (modifiers & DM_CONST)
 378                 add_method_additional_properties(irtype, mtp_property_const);
 379         if (modifiers & DM_PURE)
 380                 add_method_additional_properties(irtype, mtp_property_pure);
 381         if (modifiers & DM_RETURNS_TWICE)
 382                 add_method_additional_properties(irtype, mtp_property_returns_twice);
 383         if (modifiers & DM_NORETURN)
 384                 add_method_additional_properties(irtype, mtp_property_noreturn);
 385         if (modifiers & DM_NOTHROW)
 386                 add_method_additional_properties(irtype, mtp_property_nothrow);
 387         if (modifiers & DM_MALLOC)
 388                 add_method_additional_properties(irtype, mtp_property_malloc);
 389
 390         return irtype;
 391 }
 392
 393 static ir_type *create_pointer_type(pointer_type_t *type)
 394 {
 395         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) type);
 396         type_t        *points_to    = type->points_to;
 397         ir_type       *ir_points_to = get_ir_type_incomplete(points_to);
 398         ir_type       *irtype       = new_d_type_pointer(ir_points_to, dbgi);
 399
 400         return irtype;
 401 }
 402
 403 static ir_type *create_reference_type(reference_type_t *type)
 404 {
 405         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) type);
 406         type_t        *refers_to    = type->refers_to;
 407         ir_type       *ir_refers_to = get_ir_type_incomplete(refers_to);
 408         ir_type       *irtype       = new_d_type_pointer(ir_refers_to, dbgi);
 409
 410         return irtype;
 411 }
 412
 413 static ir_type *create_array_type(array_type_t *type)
 414 {
 415         type_dbg_info *dbgi            = get_type_dbg_info_((const type_t*) type);
 416         type_t        *element_type    = type->element_type;
 417         ir_type       *ir_element_type = get_ir_type(element_type);
 418         ir_type       *irtype          = new_d_type_array(1, ir_element_type, dbgi);
 419
 420         const int align = get_type_alignment_bytes(ir_element_type);
 421         set_type_alignment_bytes(irtype, align);
 422
 423         if (type->size_constant) {
 424                 int n_elements = type->size;
 425
 426                 set_array_bounds_int(irtype, 0, 0, n_elements);
 427
 428                 size_t elemsize = get_type_size_bytes(ir_element_type);
 429                 if (elemsize % align > 0) {
 430                         elemsize += align - (elemsize % align);
 431                 }
 432                 set_type_size_bytes(irtype, n_elements * elemsize);
 433         } else {
 434                 set_array_lower_bound_int(irtype, 0, 0);
 435         }
 436         set_type_state(irtype, layout_fixed);
 437
 438         return irtype;
 439 }
 440
 441 /**
 442  * Return the signed integer type of size bits.
 443  *
 444  * @param size   the size
 445  */
 446 static ir_type *get_signed_int_type_for_bit_size(ir_type *base_tp,
 447                                                  unsigned size,
 448                                                                                                  const type_t *type)
 449 {
 450         static ir_mode *s_modes[64 + 1] = {NULL, };
 451         ir_type *res;
 452         ir_mode *mode;
 453
 454         if (size <= 0 || size > 64)
 455                 return NULL;
 456
 457         mode = s_modes[size];
 458         if (mode == NULL) {
 459                 char name[32];
 460
 461                 snprintf(name, sizeof(name), "bf_I%u", size);
 462                 mode = new_int_mode(name, irma_twos_complement, size, 1, 0);
 463                 s_modes[size] = mode;
 464         }
 465
 466         type_dbg_info *dbgi = get_type_dbg_info_(type);
 467         res                 = new_d_type_primitive(mode, dbgi);
 468         set_primitive_base_type(res, base_tp);
 469
 470         return res;
 471 }
 472
 473 /**
 474  * Return the unsigned integer type of size bits.
 475  *
 476  * @param size   the size
 477  */
 478 static ir_type *get_unsigned_int_type_for_bit_size(ir_type *base_tp,
 479                                                    unsigned size,
 480                                                                                                    const type_t *type)
 481 {
 482         static ir_mode *u_modes[64 + 1] = {NULL, };
 483         ir_type *res;
 484         ir_mode *mode;
 485
 486         if (size <= 0 || size > 64)
 487                 return NULL;
 488
 489         mode = u_modes[size];
 490         if (mode == NULL) {
 491                 char name[32];
 492
 493                 snprintf(name, sizeof(name), "bf_U%u", size);
 494                 mode = new_int_mode(name, irma_twos_complement, size, 0, 0);
 495                 u_modes[size] = mode;
 496         }
 497
 498         type_dbg_info *dbgi = get_type_dbg_info_(type);
 499         res = new_d_type_primitive(mode, dbgi);
 500         set_primitive_base_type(res, base_tp);
 501
 502         return res;
 503 }
 504
 505 static ir_type *create_bitfield_type(const entity_t *entity)
 506 {
 507         assert(entity->kind == ENTITY_COMPOUND_MEMBER);
 508         type_t *base = skip_typeref(entity->declaration.type);
 509         assert(base->kind == TYPE_ATOMIC || base->kind == TYPE_ENUM);
 510         ir_type *irbase = get_ir_type(base);
 511
 512         unsigned bit_size = entity->compound_member.bit_size;
 513
 514         assert(!is_type_float(base));
 515         if (is_type_signed(base)) {
 516                 return get_signed_int_type_for_bit_size(irbase, bit_size, base);
 517         } else {
 518                 return get_unsigned_int_type_for_bit_size(irbase, bit_size, base);
 519         }
 520 }
 521
 522 enum {
 523         COMPOUND_IS_STRUCT = false,
 524         COMPOUND_IS_UNION  = true
 525 };
 526
 527 /**
 528  * Construct firm type from ast struct type.
 529  */
 530 static ir_type *create_compound_type(compound_type_t *type,
 531                                      bool incomplete, bool is_union)
 532 {
 533         compound_t *compound = type->compound;
 534
 535         if (compound->irtype != NULL && (compound->irtype_complete || incomplete)) {
 536                 return compound->irtype;
 537         }
 538
 539         symbol_t *type_symbol = compound->base.symbol;
 540         ident    *id;
 541         if (type_symbol != NULL) {
 542                 id = new_id_from_str(type_symbol->string);
 543         } else {
 544                 if (is_union) {
 545                         id = id_unique("__anonymous_union.%u");
 546                 } else {
 547                         id = id_unique("__anonymous_struct.%u");
 548                 }
 549         }
 550
 551         ir_type *irtype;
 552         if (is_union) {
 553                 irtype = new_type_union(id);
 554         } else {
 555                 irtype = new_type_struct(id);
 556         }
 557
 558         compound->irtype_complete = false;
 559         compound->irtype          = irtype;
 560
 561         if (incomplete)
 562                 return irtype;
 563
 564         if (is_union) {
 565                 layout_union_type(type);
 566         } else {
 567                 layout_struct_type(type);
 568         }
 569
 570         compound->irtype_complete = true;
 571
 572         entity_t *entry = compound->members.entities;
 573         for ( ; entry != NULL; entry = entry->base.next) {
 574                 if (entry->kind != ENTITY_COMPOUND_MEMBER)
 575                         continue;
 576
 577                 symbol_t *symbol     = entry->base.symbol;
 578                 type_t   *entry_type = entry->declaration.type;
 579                 ident    *ident;
 580                 if (symbol == NULL) {
 581                         /* anonymous bitfield member, skip */
 582                         if (entry->compound_member.bitfield)
 583                                 continue;
 584                         assert(entry_type->kind == TYPE_COMPOUND_STRUCT
 585                                         || entry_type->kind == TYPE_COMPOUND_UNION);
 586                         ident = id_unique("anon.%u");
 587                 } else {
 588                         ident = new_id_from_str(symbol->string);
 589                 }
 590
 591                 dbg_info *dbgi       = get_dbg_info(&entry->base.source_position);
 592
 593                 ir_type *entry_irtype;
 594                 if (entry->compound_member.bitfield) {
 595                         entry_irtype = create_bitfield_type(entry);
 596                 } else {
 597                         entry_irtype = get_ir_type(entry_type);
 598                 }
 599                 ir_entity *entity = new_d_entity(irtype, ident, entry_irtype, dbgi);
 600
 601                 set_entity_offset(entity, entry->compound_member.offset);
 602                 set_entity_offset_bits_remainder(entity,
 603                                                  entry->compound_member.bit_offset);
 604
 605                 assert(entry->declaration.kind == DECLARATION_KIND_UNKNOWN);
 606                 entry->declaration.kind       = DECLARATION_KIND_COMPOUND_MEMBER;
 607                 entry->compound_member.entity = entity;
 608         }
 609
 610         set_type_alignment_bytes(irtype, compound->alignment);
 611         set_type_size_bytes(irtype, compound->size);
 612         set_type_state(irtype, layout_fixed);
 613
 614         return irtype;
 615 }
 616
 617 static ir_tarval *fold_constant_to_tarval(expression_t const *);
 618
 619 static void determine_enum_values(enum_type_t *const type)
 620 {
 621         ir_mode   *const mode    = atomic_modes[type->base.akind];
 622         ir_tarval *const one     = get_mode_one(mode);
 623         ir_tarval *      tv_next = get_mode_null(mode);
 624
 625         enum_t   *enume = type->enume;
 626         entity_t *entry = enume->base.next;
 627         for (; entry != NULL; entry = entry->base.next) {
 628                 if (entry->kind != ENTITY_ENUM_VALUE)
 629                         break;
 630
 631                 expression_t *const init = entry->enum_value.value;
 632                 if (init != NULL) {
 633                         tv_next = fold_constant_to_tarval(init);
 634                 }
 635                 assert(entry->enum_value.tv == NULL || entry->enum_value.tv == tv_next);
 636                 entry->enum_value.tv = tv_next;
 637                 tv_next = tarval_add(tv_next, one);
 638         }
 639 }
 640
 641 static ir_type *create_enum_type(enum_type_t *const type)
 642 {
 643         return create_atomic_type(type->base.akind, (const type_t*) type);
 644 }
 645
 646 static ir_type *get_ir_type_incomplete(type_t *type)
 647 {
 648         assert(type != NULL);
 649         type = skip_typeref(type);
 650
 651         if (type->base.firm_type != NULL) {
 652                 return type->base.firm_type;
 653         }
 654
 655         switch (type->kind) {
 656         case TYPE_COMPOUND_STRUCT:
 657                 return create_compound_type(&type->compound, true, COMPOUND_IS_STRUCT);
 658         case TYPE_COMPOUND_UNION:
 659                 return create_compound_type(&type->compound, true, COMPOUND_IS_UNION);
 660         default:
 661                 return get_ir_type(type);
 662         }
 663 }
 664
 665 ir_type *get_ir_type(type_t *type)
 666 {
 667         assert(type != NULL);
 668
 669         type = skip_typeref(type);
 670
 671         if (type->base.firm_type != NULL) {
 672                 return type->base.firm_type;
 673         }
 674
 675         ir_type *firm_type = NULL;
 676         switch (type->kind) {
 677         case TYPE_ATOMIC:
 678                 firm_type = create_atomic_type(type->atomic.akind, type);
 679                 break;
 680         case TYPE_COMPLEX:
 681                 firm_type = create_complex_type(&type->atomic);
 682                 break;
 683         case TYPE_IMAGINARY:
 684                 firm_type = create_imaginary_type(&type->atomic);
 685                 break;
 686         case TYPE_FUNCTION:
 687                 firm_type = create_method_type(&type->function, false);
 688                 break;
 689         case TYPE_POINTER:
 690                 firm_type = create_pointer_type(&type->pointer);
 691                 break;
 692         case TYPE_REFERENCE:
 693                 firm_type = create_reference_type(&type->reference);
 694                 break;
 695         case TYPE_ARRAY:
 696                 firm_type = create_array_type(&type->array);
 697                 break;
 698         case TYPE_COMPOUND_STRUCT:
 699                 firm_type = create_compound_type(&type->compound, false, COMPOUND_IS_STRUCT);
 700                 break;
 701         case TYPE_COMPOUND_UNION:
 702                 firm_type = create_compound_type(&type->compound, false, COMPOUND_IS_UNION);
 703                 break;
 704         case TYPE_ENUM:
 705                 firm_type = create_enum_type(&type->enumt);
 706                 break;
 707
 708         case TYPE_ERROR:
 709         case TYPE_TYPEOF:
 710         case TYPE_TYPEDEF:
 711                 break;
 712         }
 713         if (firm_type == NULL)
 714                 panic("unknown type found");
 715
 716         type->base.firm_type = firm_type;
 717         return firm_type;
 718 }
 719
 720 static ir_mode *get_ir_mode_storage(type_t *type)
 721 {
 722         ir_type *irtype = get_ir_type(type);
 723
 724         /* firm doesn't report a mode for arrays somehow... */
 725         if (is_Array_type(irtype)) {
 726                 return mode_P_data;
 727         }
 728
 729         ir_mode *mode = get_type_mode(irtype);
 730         assert(mode != NULL);
 731         return mode;
 732 }
 733
 734 /*
 735  * get arithmetic mode for a type. This is different from get_ir_mode_storage,
 736  * int that it returns bigger modes for floating point on some platforms
 737  * (x87 internally does arithemtic with 80bits)
 738  */
 739 static ir_mode *get_ir_mode_arithmetic(type_t *type)
 740 {
 741         ir_mode *mode = get_ir_mode_storage(type);
 742         if (mode_is_float(mode) && mode_float_arithmetic != NULL) {
 743                 return mode_float_arithmetic;
 744         }
 745
 746         return mode;
 747 }
 748
 749 /**
 750  * Return a node representing the size of a type.
 751  */
 752 static ir_node *get_type_size_node(type_t *type)
 753 {
 754         unsigned size;
 755         ir_mode *mode = get_ir_mode_arithmetic(type_size_t);
 756         type = skip_typeref(type);
 757
 758         if (is_type_array(type) && type->array.is_vla) {
 759                 ir_node *size_node = get_vla_size(&type->array);
 760                 ir_node *elem_size = get_type_size_node(type->array.element_type);
 761                 ir_node *real_size = new_d_Mul(NULL, size_node, elem_size, mode);
 762                 return real_size;
 763         }
 764
 765         size = get_type_size(type);
 766         return new_Const_long(mode, size);
 767 }
 768
 769 /** Names of the runtime functions. */
 770 static const struct {
 771         int        id;           /**< the rts id */
 772         int        n_res;        /**< number of return values */
 773         const char *name;        /**< the name of the rts function */
 774         int        n_params;     /**< number of parameters */
 775         unsigned   flags;        /**< language flags */
 776 } rts_data[] = {
 777         { rts_debugbreak, 0, "__debugbreak", 0, _MS },
 778         { rts_abort,      0, "abort",        0, _C89 },
 779         { rts_alloca,     1, "alloca",       1, _ALL },
 780         { rts_abs,        1, "abs",          1, _C89 },
 781         { rts_labs,       1, "labs",         1, _C89 },
 782         { rts_llabs,      1, "llabs",        1, _C99 },
 783         { rts_imaxabs,    1, "imaxabs",      1, _C99 },
 784
 785         { rts_fabs,       1, "fabs",         1, _C89 },
 786         { rts_sqrt,       1, "sqrt",         1, _C89 },
 787         { rts_cbrt,       1, "cbrt",         1, _C99 },
 788         { rts_exp,        1, "exp",          1, _C89 },
 789         { rts_exp2,       1, "exp2",         1, _C89 },
 790         { rts_exp10,      1, "exp10",        1, _GNUC },
 791         { rts_log,        1, "log",          1, _C89 },
 792         { rts_log2,       1, "log2",         1, _C89 },
 793         { rts_log10,      1, "log10",        1, _C89 },
 794         { rts_pow,        1, "pow",          2, _C89 },
 795         { rts_sin,        1, "sin",          1, _C89 },
 796         { rts_cos,        1, "cos",          1, _C89 },
 797         { rts_tan,        1, "tan",          1, _C89 },
 798         { rts_asin,       1, "asin",         1, _C89 },
 799         { rts_acos,       1, "acos",         1, _C89 },
 800         { rts_atan,       1, "atan",         1, _C89 },
 801         { rts_sinh,       1, "sinh",         1, _C89 },
 802         { rts_cosh,       1, "cosh",         1, _C89 },
 803         { rts_tanh,       1, "tanh",         1, _C89 },
 804
 805         { rts_fabsf,      1, "fabsf",        1, _C99 },
 806         { rts_sqrtf,      1, "sqrtf",        1, _C99 },
 807         { rts_cbrtf,      1, "cbrtf",        1, _C99 },
 808         { rts_expf,       1, "expf",         1, _C99 },
 809         { rts_exp2f,      1, "exp2f",        1, _C99 },
 810         { rts_exp10f,     1, "exp10f",       1, _GNUC },
 811         { rts_logf,       1, "logf",         1, _C99 },
 812         { rts_log2f,      1, "log2f",        1, _C99 },
 813         { rts_log10f,     1, "log10f",       1, _C99 },
 814         { rts_powf,       1, "powf",         2, _C99 },
 815         { rts_sinf,       1, "sinf",         1, _C99 },
 816         { rts_cosf,       1, "cosf",         1, _C99 },
 817         { rts_tanf,       1, "tanf",         1, _C99 },
 818         { rts_asinf,      1, "asinf",        1, _C99 },
 819         { rts_acosf,      1, "acosf",        1, _C99 },
 820         { rts_atanf,      1, "atanf",        1, _C99 },
 821         { rts_sinhf,      1, "sinhf",        1, _C99 },
 822         { rts_coshf,      1, "coshf",        1, _C99 },
 823         { rts_tanhf,      1, "tanhf",        1, _C99 },
 824
 825         { rts_fabsl,      1, "fabsl",        1, _C99 },
 826         { rts_sqrtl,      1, "sqrtl",        1, _C99 },
 827         { rts_cbrtl,      1, "cbrtl",        1, _C99 },
 828         { rts_expl,       1, "expl",         1, _C99 },
 829         { rts_exp2l,      1, "exp2l",        1, _C99 },
 830         { rts_exp10l,     1, "exp10l",       1, _GNUC },
 831         { rts_logl,       1, "logl",         1, _C99 },
 832         { rts_log2l,      1, "log2l",        1, _C99 },
 833         { rts_log10l,     1, "log10l",       1, _C99 },
 834         { rts_powl,       1, "powl",         2, _C99 },
 835         { rts_sinl,       1, "sinl",         1, _C99 },
 836         { rts_cosl,       1, "cosl",         1, _C99 },
 837         { rts_tanl,       1, "tanl",         1, _C99 },
 838         { rts_asinl,      1, "asinl",        1, _C99 },
 839         { rts_acosl,      1, "acosl",        1, _C99 },
 840         { rts_atanl,      1, "atanl",        1, _C99 },
 841         { rts_sinhl,      1, "sinhl",        1, _C99 },
 842         { rts_coshl,      1, "coshl",        1, _C99 },
 843         { rts_tanhl,      1, "tanhl",        1, _C99 },
 844
 845         { rts_strcmp,     1, "strcmp",       2, _C89 },
 846         { rts_strncmp,    1, "strncmp",      3, _C89 },
 847         { rts_strcpy,     1, "strcpy",       2, _C89 },
 848         { rts_strlen,     1, "strlen",       1, _C89 },
 849         { rts_memcpy,     1, "memcpy",       3, _C89 },
 850         { rts_mempcpy,    1, "mempcpy",      3, _GNUC },
 851         { rts_memmove,    1, "memmove",      3, _C89 },
 852         { rts_memset,     1, "memset",       3, _C89 },
 853         { rts_memcmp,     1, "memcmp",       3, _C89 },
 854 };
 855
 856 static ident *rts_idents[lengthof(rts_data)];
 857
 858 static create_ld_ident_func create_ld_ident = create_name_linux_elf;
 859
 860 void set_create_ld_ident(ident *(*func)(entity_t*))
 861 {
 862         create_ld_ident = func;
 863 }
 864
 865 /**
 866  * Handle GNU attributes for entities
 867  *
 868  * @param ent   the entity
 869  * @param decl  the routine declaration
 870  */
 871 static void handle_decl_modifiers(ir_entity *irentity, entity_t *entity)
 872 {
 873         assert(is_declaration(entity));
 874         decl_modifiers_t modifiers = entity->declaration.modifiers;
 875
 876         if (is_method_entity(irentity)) {
 877                 if (modifiers & DM_PURE) {
 878                         set_entity_additional_properties(irentity, mtp_property_pure);
 879                 }
 880                 if (modifiers & DM_CONST) {
 881                         add_entity_additional_properties(irentity, mtp_property_const);
 882                 }
 883         }
 884         if (modifiers & DM_USED) {
 885                 add_entity_linkage(irentity, IR_LINKAGE_HIDDEN_USER);
 886         }
 887         if (modifiers & DM_WEAK) {
 888                 add_entity_linkage(irentity, IR_LINKAGE_WEAK);
 889         }
 890 }
 891
 892 static bool is_main(entity_t *entity)
 893 {
 894         static symbol_t *sym_main = NULL;
 895         if (sym_main == NULL) {
 896                 sym_main = symbol_table_insert("main");
 897         }
 898
 899         if (entity->base.symbol != sym_main)
 900                 return false;
 901         /* must be in outermost scope */
 902         if (entity->base.parent_scope != &current_translation_unit->scope)
 903                 return false;
 904
 905         return true;
 906 }
 907
 908 /**
 909  * Creates an entity representing a function.
 910  *
 911  * @param entity       the function declaration/definition
 912  * @param owner_type   the owner type of this function, NULL
 913  *                     for global functions
 914  */
 915 static ir_entity *get_function_entity(entity_t *entity, ir_type *owner_type)
 916 {
 917         assert(entity->kind == ENTITY_FUNCTION);
 918         if (entity->function.irentity != NULL)
 919                 return entity->function.irentity;
 920
 921         switch (entity->function.btk) {
 922         case BUILTIN_NONE:
 923         case BUILTIN_LIBC:
 924         case BUILTIN_LIBC_CHECK:
 925                 break;
 926         default:
 927                 return NULL;
 928         }
 929
 930         if (is_main(entity)) {
 931                 /* force main to C linkage */
 932                 type_t *type = entity->declaration.type;
 933                 assert(is_type_function(type));
 934                 if (type->function.linkage != LINKAGE_C) {
 935                         type_t *new_type           = duplicate_type(type);
 936                         new_type->function.linkage = LINKAGE_C;
 937                         type                       = identify_new_type(new_type);
 938                         entity->declaration.type   = type;
 939                 }
 940         }
 941
 942         symbol_t *symbol = entity->base.symbol;
 943         ident    *id     = new_id_from_str(symbol->string);
 944
 945         /* already an entity defined? */
 946         ir_entity *irentity = entitymap_get(&entitymap, symbol);
 947         bool const has_body = entity->function.statement != NULL;
 948         if (irentity != NULL) {
 949                 if (get_entity_visibility(irentity) == ir_visibility_external
 950                                 && has_body) {
 951                         set_entity_visibility(irentity, ir_visibility_default);
 952                 }
 953                 goto entity_created;
 954         }
 955
 956         ir_type *ir_type_method;
 957         if (entity->function.need_closure)
 958                 ir_type_method = create_method_type(&entity->declaration.type->function, true);
 959         else
 960                 ir_type_method = get_ir_type(entity->declaration.type);
 961
 962         bool nested_function = false;
 963         if (owner_type == NULL)
 964                 owner_type = get_glob_type();
 965         else
 966                 nested_function = true;
 967
 968         dbg_info *const dbgi = get_dbg_info(&entity->base.source_position);
 969         irentity = new_d_entity(owner_type, id, ir_type_method, dbgi);
 970
 971         ident *ld_id;
 972         if (nested_function)
 973                 ld_id = id_unique("inner.%u");
 974         else
 975                 ld_id = create_ld_ident(entity);
 976         set_entity_ld_ident(irentity, ld_id);
 977
 978         handle_decl_modifiers(irentity, entity);
 979
 980         if (! nested_function) {
 981                 /* static inline             => local
 982                  * extern inline             => local
 983                  * inline without definition => local
 984                  * inline with definition    => external_visible */
 985                 storage_class_tag_t const storage_class
 986                         = (storage_class_tag_t) entity->declaration.storage_class;
 987                 bool                const is_inline     = entity->function.is_inline;
 988
 989                 if (is_inline && storage_class == STORAGE_CLASS_NONE && has_body) {
 990                     set_entity_visibility(irentity, ir_visibility_default);
 991                 } else if (storage_class == STORAGE_CLASS_STATIC ||
 992                            (is_inline && has_body)) {
 993                     set_entity_visibility(irentity, ir_visibility_local);
 994                 } else if (has_body) {
 995                     set_entity_visibility(irentity, ir_visibility_default);
 996                 } else {
 997                     set_entity_visibility(irentity, ir_visibility_external);
 998                 }
 999         } else {
1000                 /* nested functions are always local */
1001                 set_entity_visibility(irentity, ir_visibility_local);
1002         }
1003
1004         /* We should check for file scope here, but as long as we compile C only
1005            this is not needed. */
1006         if (!freestanding && !has_body) {
1007                 /* check for a known runtime function */
1008                 for (size_t i = 0; i < lengthof(rts_data); ++i) {
1009                         if (id != rts_idents[i])
1010                                 continue;
1011
1012                         function_type_t *function_type
1013                                 = &entity->declaration.type->function;
1014                         /* rts_entities code can't handle a "wrong" number of parameters */
1015                         if (function_type->unspecified_parameters)
1016                                 continue;
1017
1018                         /* check number of parameters */
1019                         int n_params = count_parameters(function_type);
1020                         if (n_params != rts_data[i].n_params)
1021                                 continue;
1022
1023                         type_t *return_type = skip_typeref(function_type->return_type);
1024                         int     n_res       = is_type_void(return_type) ? 0 : 1;
1025                         if (n_res != rts_data[i].n_res)
1026                                 continue;
1027
1028                         /* ignore those rts functions not necessary needed for current mode */
1029                         if ((c_mode & rts_data[i].flags) == 0)
1030                                 continue;
1031                         assert(rts_entities[rts_data[i].id] == NULL);
1032                         rts_entities[rts_data[i].id] = irentity;
1033                 }
1034         }
1035
1036         entitymap_insert(&entitymap, symbol, irentity);
1037
1038 entity_created:
1039         entity->declaration.kind  = DECLARATION_KIND_FUNCTION;
1040         entity->function.irentity = irentity;
1041
1042         return irentity;
1043 }
1044
1045 /**
1046  * Creates a SymConst for a given entity.
1047  *
1048  * @param dbgi    debug info
1049  * @param entity  the entity
1050  */
1051 static ir_node *create_symconst(dbg_info *dbgi, ir_entity *entity)
1052 {
1053         assert(entity != NULL);
1054         union symconst_symbol sym;
1055         sym.entity_p = entity;
1056         return new_d_SymConst(dbgi, mode_P, sym, symconst_addr_ent);
1057 }
1058
1059 static ir_node *create_Const_from_bool(ir_mode *const mode, bool const v)
1060 {
1061         return new_Const((v ? get_mode_one : get_mode_null)(mode));
1062 }
1063
1064 static ir_node *create_conv_from_b(dbg_info *dbgi, ir_node *value,
1065                                    ir_mode *dest_mode)
1066 {
1067         if (is_Const(value)) {
1068                 return create_Const_from_bool(dest_mode, !is_Const_null(value));
1069         }
1070
1071         ir_node *cond       = new_d_Cond(dbgi, value);
1072         ir_node *proj_true  = new_Proj(cond, mode_X, pn_Cond_true);
1073         ir_node *proj_false = new_Proj(cond, mode_X, pn_Cond_false);
1074         ir_node *tblock     = new_Block(1, &proj_true);
1075         ir_node *fblock     = new_Block(1, &proj_false);
1076         set_cur_block(tblock);
1077         ir_node *const1 = new_Const(get_mode_one(dest_mode));
1078         ir_node *tjump  = new_Jmp();
1079         set_cur_block(fblock);
1080         ir_node *const0 = new_Const(get_mode_null(dest_mode));
1081         ir_node *fjump  = new_Jmp();
1082
1083         ir_node *in[2]      = { tjump, fjump };
1084         ir_node *mergeblock = new_Block(2, in);
1085         set_cur_block(mergeblock);
1086         ir_node *phi_in[2]  = { const1, const0 };
1087         ir_node *phi        = new_Phi(2, phi_in, dest_mode);
1088         return phi;
1089 }
1090
1091 static ir_node *create_conv(dbg_info *dbgi, ir_node *value, ir_mode *dest_mode)
1092 {
1093         ir_mode *value_mode = get_irn_mode(value);
1094
1095         if (value_mode == dest_mode)
1096                 return value;
1097
1098         if (dest_mode == mode_b) {
1099                 ir_node *zero = new_Const(get_mode_null(value_mode));
1100                 ir_node *cmp  = new_d_Cmp(dbgi, value, zero, ir_relation_unordered_less_greater);
1101                 return cmp;
1102         } else if (value_mode == mode_b) {
1103                 return create_conv_from_b(dbgi, value, dest_mode);
1104         }
1105
1106         return new_d_Conv(dbgi, value, dest_mode);
1107 }
1108
1109 /**
1110  * Creates a SymConst node representing a wide string literal.
1111  *
1112  * @param literal   the wide string literal
1113  */
1114 static ir_node *wide_string_literal_to_firm(
1115                 const string_literal_expression_t *literal)
1116 {
1117         ir_type  *const global_type = get_glob_type();
1118         ir_type  *const elem_type   = ir_type_wchar_t;
1119         dbg_info *const dbgi        = get_dbg_info(&literal->base.source_position);
1120         ir_type  *const type        = new_type_array(1, elem_type);
1121
1122         ident     *const id     = id_unique("str.%u");
1123         ir_entity *const entity = new_d_entity(global_type, id, type, dbgi);
1124         set_entity_ld_ident(entity, id);
1125         set_entity_visibility(entity, ir_visibility_private);
1126         add_entity_linkage(entity, IR_LINKAGE_CONSTANT);
1127
1128         ir_mode      *const mode = get_type_mode(elem_type);
1129         const size_t        slen = wstrlen(&literal->value);
1130
1131         set_array_lower_bound_int(type, 0, 0);
1132         set_array_upper_bound_int(type, 0, slen);
1133         set_type_size_bytes(type, slen * get_mode_size_bytes(mode));
1134         set_type_state(type, layout_fixed);
1135
1136         ir_initializer_t *initializer = create_initializer_compound(slen);
1137         const char              *p    = literal->value.begin;
1138         for (size_t i = 0; i < slen; ++i) {
1139                 assert(p < literal->value.begin + literal->value.size);
1140                 utf32             v   = read_utf8_char(&p);
1141                 ir_tarval        *tv  = new_tarval_from_long(v, mode);
1142                 ir_initializer_t *val = create_initializer_tarval(tv);
1143                 set_initializer_compound_value(initializer, i, val);
1144         }
1145         set_entity_initializer(entity, initializer);
1146
1147         return create_symconst(dbgi, entity);
1148 }
1149
1150 /**
1151  * Creates a SymConst node representing a string constant.
1152  *
1153  * @param src_pos    the source position of the string constant
1154  * @param id_prefix  a prefix for the name of the generated string constant
1155  * @param value      the value of the string constant
1156  */
1157 static ir_node *string_to_firm(const source_position_t *const src_pos,
1158                                const char *const id_prefix,
1159                                const string_t *const value)
1160 {
1161         ir_type  *const global_type = get_glob_type();
1162         dbg_info *const dbgi        = get_dbg_info(src_pos);
1163         ir_type  *const type        = new_type_array(1, ir_type_const_char);
1164
1165         ident     *const id     = id_unique(id_prefix);
1166         ir_entity *const entity = new_d_entity(global_type, id, type, dbgi);
1167         set_entity_ld_ident(entity, id);
1168         set_entity_visibility(entity, ir_visibility_private);
1169         add_entity_linkage(entity, IR_LINKAGE_CONSTANT);
1170
1171         ir_type *const elem_type = ir_type_const_char;
1172         ir_mode *const mode      = get_type_mode(elem_type);
1173
1174         const char* const string = value->begin;
1175         const size_t      slen   = value->size;
1176
1177         set_array_lower_bound_int(type, 0, 0);
1178         set_array_upper_bound_int(type, 0, slen);
1179         set_type_size_bytes(type, slen);
1180         set_type_state(type, layout_fixed);
1181
1182         ir_initializer_t *initializer = create_initializer_compound(slen);
1183         for (size_t i = 0; i < slen; ++i) {
1184                 ir_tarval        *tv  = new_tarval_from_long(string[i], mode);
1185                 ir_initializer_t *val = create_initializer_tarval(tv);
1186                 set_initializer_compound_value(initializer, i, val);
1187         }
1188         set_entity_initializer(entity, initializer);
1189
1190         return create_symconst(dbgi, entity);
1191 }
1192
1193 static bool try_create_integer(literal_expression_t *literal,
1194                                type_t *type, unsigned char base)
1195 {
1196         const char *string = literal->value.begin;
1197         size_t      size   = literal->value.size;
1198
1199         assert(type->kind == TYPE_ATOMIC);
1200         atomic_type_kind_t akind = type->atomic.akind;
1201
1202         ir_mode   *mode = atomic_modes[akind];
1203         ir_tarval *tv   = new_integer_tarval_from_str(string, size, 1, base, mode);
1204         if (tv == tarval_bad)
1205                 return false;
1206
1207         literal->base.type    = type;
1208         literal->target_value = tv;
1209         return true;
1210 }
1211
1212 static void create_integer_tarval(literal_expression_t *literal)
1213 {
1214         unsigned        us     = 0;
1215         unsigned        ls     = 0;
1216         const string_t *suffix = &literal->suffix;
1217         /* parse suffix */
1218         if (suffix->size > 0) {
1219                 for (const char *c = suffix->begin; *c != '\0'; ++c) {
1220                         if (*c == 'u' || *c == 'U') { ++us; }
1221                         if (*c == 'l' || *c == 'L') { ++ls; }
1222                 }
1223         }
1224
1225         unsigned base;
1226         switch (literal->base.kind) {
1227                 case EXPR_LITERAL_INTEGER_OCTAL:       base =  8; break;
1228                 case EXPR_LITERAL_INTEGER:             base = 10; break;
1229                 case EXPR_LITERAL_INTEGER_HEXADECIMAL: base = 16; break;
1230                 default: panic("invalid literal kind");
1231         }
1232
1233         tarval_int_overflow_mode_t old_mode = tarval_get_integer_overflow_mode();
1234
1235         /* now try if the constant is small enough for some types */
1236         tarval_set_integer_overflow_mode(TV_OVERFLOW_BAD);
1237         if (ls < 1) {
1238                 if (us == 0 && try_create_integer(literal, type_int, base))
1239                         goto finished;
1240                 if ((us == 1 || base != 10)
1241                                 && try_create_integer(literal, type_unsigned_int, base))
1242                         goto finished;
1243         }
1244         if (ls < 2) {
1245                 if (us == 0 && try_create_integer(literal, type_long, base))
1246                         goto finished;
1247                 if ((us == 1 || base != 10)
1248                                 && try_create_integer(literal, type_unsigned_long, base))
1249                         goto finished;
1250         }
1251         /* last try? then we should not report tarval_bad */
1252         if (us != 1 && base == 10)
1253                 tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
1254         if (us == 0 && try_create_integer(literal, type_long_long, base))
1255                 goto finished;
1256
1257         /* last try */
1258         assert(us == 1 || base != 10);
1259         tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
1260         bool res = try_create_integer(literal, type_unsigned_long_long, base);
1261         if (!res)
1262                 panic("internal error when parsing number literal");
1263
1264 finished:
1265         tarval_set_integer_overflow_mode(old_mode);
1266 }
1267
1268 void determine_literal_type(literal_expression_t *literal)
1269 {
1270         switch (literal->base.kind) {
1271         case EXPR_LITERAL_INTEGER:
1272         case EXPR_LITERAL_INTEGER_OCTAL:
1273         case EXPR_LITERAL_INTEGER_HEXADECIMAL:
1274                 create_integer_tarval(literal);
1275                 return;
1276         default:
1277                 break;
1278         }
1279 }
1280
1281 /**
1282  * Creates a Const node representing a constant.
1283  */
1284 static ir_node *literal_to_firm(const literal_expression_t *literal)
1285 {
1286         type_t     *type   = skip_typeref(literal->base.type);
1287         ir_mode    *mode   = get_ir_mode_storage(type);
1288         const char *string = literal->value.begin;
1289         size_t      size   = literal->value.size;
1290         ir_tarval  *tv;
1291
1292         switch (literal->base.kind) {
1293         case EXPR_LITERAL_WIDE_CHARACTER: {
1294                 utf32  v = read_utf8_char(&string);
1295                 char   buf[128];
1296                 size_t len = snprintf(buf, sizeof(buf), UTF32_PRINTF_FORMAT, v);
1297
1298                 tv = new_tarval_from_str(buf, len, mode);
1299                 goto make_const;
1300         }
1301         case EXPR_LITERAL_CHARACTER: {
1302                 long long int v;
1303                 bool char_is_signed
1304                         = get_atomic_type_flags(ATOMIC_TYPE_CHAR) & ATOMIC_TYPE_FLAG_SIGNED;
1305                 if (size == 1 && char_is_signed) {
1306                         v = (signed char)string[0];
1307                 } else {
1308                         v = 0;
1309                         for (size_t i = 0; i < size; ++i) {
1310                                 v = (v << 8) | ((unsigned char)string[i]);
1311                         }
1312                 }
1313                 char   buf[128];
1314                 size_t len = snprintf(buf, sizeof(buf), "%lld", v);
1315
1316                 tv = new_tarval_from_str(buf, len, mode);
1317                 goto make_const;
1318         }
1319         case EXPR_LITERAL_INTEGER:
1320         case EXPR_LITERAL_INTEGER_OCTAL:
1321         case EXPR_LITERAL_INTEGER_HEXADECIMAL:
1322                 assert(literal->target_value != NULL);
1323                 tv = literal->target_value;
1324                 goto make_const;
1325         case EXPR_LITERAL_FLOATINGPOINT:
1326                 tv = new_tarval_from_str(string, size, mode);
1327                 goto make_const;
1328         case EXPR_LITERAL_FLOATINGPOINT_HEXADECIMAL: {
1329                 char buffer[size + 2];
1330                 memcpy(buffer, "0x", 2);
1331                 memcpy(buffer+2, string, size);
1332                 tv = new_tarval_from_str(buffer, size+2, mode);
1333                 goto make_const;
1334         }
1335         case EXPR_LITERAL_BOOLEAN:
1336                 if (string[0] == 't') {
1337                         tv = get_mode_one(mode);
1338                 } else {
1339                         assert(string[0] == 'f');
1340                         tv = get_mode_null(mode);
1341                 }
1342                 goto make_const;
1343         case EXPR_LITERAL_MS_NOOP:
1344                 tv = get_mode_null(mode);
1345                 goto make_const;
1346         default:
1347                 break;
1348         }
1349         panic("Invalid literal kind found");
1350
1351 make_const: ;
1352         dbg_info *dbgi       = get_dbg_info(&literal->base.source_position);
1353         ir_node  *res        = new_d_Const(dbgi, tv);
1354         ir_mode  *mode_arith = get_ir_mode_arithmetic(type);
1355         return create_conv(dbgi, res, mode_arith);
1356 }
1357
1358 /*
1359  * Allocate an area of size bytes aligned at alignment
1360  * at a frame type.
1361  */
1362 static ir_entity *alloc_trampoline(ir_type *frame_type, int size, unsigned alignment)
1363 {
1364         static unsigned area_cnt = 0;
1365         char buf[32];
1366
1367         ir_type *tp = new_type_array(1, ir_type_char);
1368         set_array_bounds_int(tp, 0, 0, size);
1369         set_type_alignment_bytes(tp, alignment);
1370
1371         snprintf(buf, sizeof(buf), "trampolin%u", area_cnt++);
1372         ident *name = new_id_from_str(buf);
1373         ir_entity *area = new_entity(frame_type, name, tp);
1374
1375         /* mark this entity as compiler generated */
1376         set_entity_compiler_generated(area, 1);
1377         return area;
1378 }
1379
1380 /**
1381  * Return a node representing a trampoline region
1382  * for a given function entity.
1383  *
1384  * @param dbgi    debug info
1385  * @param entity  the function entity
1386  */
1387 static ir_node *get_trampoline_region(dbg_info *dbgi, ir_entity *entity)
1388 {
1389         ir_entity *region = NULL;
1390         int        i;
1391
1392         if (current_trampolines != NULL) {
1393                 for (i = ARR_LEN(current_trampolines) - 1; i >= 0; --i) {
1394                         if (current_trampolines[i].function == entity) {
1395                                 region = current_trampolines[i].region;
1396                                 break;
1397                         }
1398                 }
1399         } else {
1400                 current_trampolines = NEW_ARR_F(trampoline_region, 0);
1401         }
1402         ir_graph *irg = current_ir_graph;
1403         if (region == NULL) {
1404                 /* create a new region */
1405                 ir_type           *frame_tp = get_irg_frame_type(irg);
1406                 trampoline_region  reg;
1407                 reg.function = entity;
1408
1409                 reg.region   = alloc_trampoline(frame_tp,
1410                                                 be_params->trampoline_size,
1411                                                 be_params->trampoline_align);
1412                 ARR_APP1(trampoline_region, current_trampolines, reg);
1413                 region = reg.region;
1414         }
1415         return new_d_simpleSel(dbgi, get_irg_no_mem(irg), get_irg_frame(irg),
1416                                region);
1417 }
1418
1419 /**
1420  * Creates a trampoline for a function represented by an entity.
1421  *
1422  * @param dbgi    debug info
1423  * @param mode    the (reference) mode for the function address
1424  * @param entity  the function entity
1425  */
1426 static ir_node *create_trampoline(dbg_info *dbgi, ir_mode *mode,
1427                                   ir_entity *entity)
1428 {
1429         assert(entity != NULL);
1430         ir_node *in[3];
1431         in[0] = get_trampoline_region(dbgi, entity);
1432         in[1] = create_symconst(dbgi, entity);
1433         in[2] = get_irg_frame(current_ir_graph);
1434
1435         ir_node *irn = new_d_Builtin(dbgi, get_store(), 3, in, ir_bk_inner_trampoline, get_unknown_type());
1436         set_store(new_Proj(irn, mode_M, pn_Builtin_M));
1437         return new_Proj(irn, mode, pn_Builtin_max+1);
1438 }
1439
1440 /**
1441  * Dereference an address.
1442  *
1443  * @param dbgi  debug info
1444  * @param type  the type of the dereferenced result (the points_to type)
1445  * @param addr  the address to dereference
1446  */
1447 static ir_node *deref_address(dbg_info *const dbgi, type_t *const type,
1448                                       ir_node *const addr)
1449 {
1450         type_t *skipped = skip_typeref(type);
1451         if (is_type_incomplete(skipped))
1452                 return addr;
1453
1454         ir_type *irtype = get_ir_type(skipped);
1455         if (is_compound_type(irtype)
1456             || is_Method_type(irtype)
1457             || is_Array_type(irtype)) {
1458                 return addr;
1459         }
1460
1461         ir_cons_flags  flags    = skipped->base.qualifiers & TYPE_QUALIFIER_VOLATILE
1462                                   ? cons_volatile : cons_none;
1463         ir_mode *const mode     = get_type_mode(irtype);
1464         ir_node *const memory   = get_store();
1465         ir_node *const load     = new_d_Load(dbgi, memory, addr, mode, flags);
1466         ir_node *const load_mem = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1467         ir_node *const load_res = new_d_Proj(dbgi, load, mode,   pn_Load_res);
1468
1469         set_store(load_mem);
1470
1471         ir_mode *const mode_arithmetic = get_ir_mode_arithmetic(skipped);
1472         return create_conv(dbgi, load_res, mode_arithmetic);
1473 }
1474
1475 /**
1476  * Creates a strict Conv (to the node's mode) if necessary.
1477  *
1478  * @param dbgi  debug info
1479  * @param node  the node to strict conv
1480  */
1481 static ir_node *do_strict_conv(dbg_info *dbgi, ir_node *node)
1482 {
1483         ir_mode *mode = get_irn_mode(node);
1484
1485         if (!(get_irg_fp_model(current_ir_graph) & fp_explicit_rounding))
1486                 return node;
1487         if (!mode_is_float(mode))
1488                 return node;
1489
1490         /* check if there is already a Conv */
1491         if (is_Conv(node)) {
1492                 /* convert it into a strict Conv */
1493                 set_Conv_strict(node, 1);
1494                 return node;
1495         }
1496
1497         /* otherwise create a new one */
1498         return new_d_strictConv(dbgi, node, mode);
1499 }
1500
1501 /**
1502  * Returns the correct base address depending on whether it is a parameter or a
1503  * normal local variable.
1504  */
1505 static ir_node *get_local_frame(ir_entity *const ent)
1506 {
1507         ir_graph      *const irg   = current_ir_graph;
1508         const ir_type *const owner = get_entity_owner(ent);
1509         if (owner == current_outer_frame) {
1510                 assert(current_static_link != NULL);
1511                 return current_static_link;
1512         } else {
1513                 return get_irg_frame(irg);
1514         }
1515 }
1516
1517 /**
1518  * Keep all memory edges of the given block.
1519  */
1520 static void keep_all_memory(ir_node *block)
1521 {
1522         ir_node *old = get_cur_block();
1523
1524         set_cur_block(block);
1525         keep_alive(get_store());
1526         /* TODO: keep all memory edges from restricted pointers */
1527         set_cur_block(old);
1528 }
1529
1530 static ir_node *enum_constant_to_firm(reference_expression_t const *const ref)
1531 {
1532         entity_t *entity = ref->entity;
1533         if (entity->enum_value.tv == NULL) {
1534                 type_t *type = skip_typeref(entity->enum_value.enum_type);
1535                 assert(type->kind == TYPE_ENUM);
1536                 determine_enum_values(&type->enumt);
1537         }
1538
1539         return new_Const(entity->enum_value.tv);
1540 }
1541
1542 static ir_node *reference_expression_to_firm(const reference_expression_t *ref)
1543 {
1544         dbg_info *dbgi   = get_dbg_info(&ref->base.source_position);
1545         entity_t *entity = ref->entity;
1546         assert(is_declaration(entity));
1547         type_t   *type   = skip_typeref(entity->declaration.type);
1548
1549         /* make sure the type is constructed */
1550         (void) get_ir_type(type);
1551
1552         if (entity->kind == ENTITY_FUNCTION
1553             && entity->function.btk != BUILTIN_NONE) {
1554                 ir_entity *irentity = get_function_entity(entity, NULL);
1555                 /* for gcc compatibility we have to produce (dummy) addresses for some
1556                  * builtins which don't have entities */
1557                 if (irentity == NULL) {
1558                         source_position_t const *const pos = &ref->base.source_position;
1559                         symbol_t          const *const sym = ref->entity->base.symbol;
1560                         warningf(WARN_OTHER, pos, "taking address of builtin '%Y'", sym);
1561
1562                         /* simply create a NULL pointer */
1563                         ir_mode  *mode = get_ir_mode_arithmetic(type_void_ptr);
1564                         ir_node  *res  = new_Const(get_mode_null(mode));
1565
1566                         return res;
1567                 }
1568         }
1569
1570         switch ((declaration_kind_t) entity->declaration.kind) {
1571         case DECLARATION_KIND_UNKNOWN:
1572                 break;
1573
1574         case DECLARATION_KIND_LOCAL_VARIABLE: {
1575                 ir_mode *const mode  = get_ir_mode_storage(type);
1576                 ir_node *const value = get_value(entity->variable.v.value_number, mode);
1577                 return create_conv(NULL, value, get_ir_mode_arithmetic(type));
1578         }
1579         case DECLARATION_KIND_PARAMETER: {
1580                 ir_mode *const mode  = get_ir_mode_storage(type);
1581                 ir_node *const value = get_value(entity->parameter.v.value_number,mode);
1582                 return create_conv(NULL, value, get_ir_mode_arithmetic(type));
1583         }
1584         case DECLARATION_KIND_FUNCTION: {
1585                 return create_symconst(dbgi, entity->function.irentity);
1586         }
1587         case DECLARATION_KIND_INNER_FUNCTION: {
1588                 ir_mode *const mode = get_ir_mode_storage(type);
1589                 if (!entity->function.goto_to_outer && !entity->function.need_closure) {
1590                         /* inner function not using the closure */
1591                         return create_symconst(dbgi, entity->function.irentity);
1592                 } else {
1593                         /* need trampoline here */
1594                         return create_trampoline(dbgi, mode, entity->function.irentity);
1595                 }
1596         }
1597         case DECLARATION_KIND_GLOBAL_VARIABLE: {
1598                 const variable_t *variable = &entity->variable;
1599                 ir_node *const addr = create_symconst(dbgi, variable->v.entity);
1600                 return deref_address(dbgi, variable->base.type, addr);
1601         }
1602
1603         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY: {
1604                 ir_entity *irentity = entity->variable.v.entity;
1605                 ir_node   *frame    = get_local_frame(irentity);
1606                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1607                 return deref_address(dbgi, entity->declaration.type, sel);
1608         }
1609         case DECLARATION_KIND_PARAMETER_ENTITY: {
1610                 ir_entity *irentity = entity->parameter.v.entity;
1611                 ir_node   *frame    = get_local_frame(irentity);
1612                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1613                 return deref_address(dbgi, entity->declaration.type, sel);
1614         }
1615
1616         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
1617                 return entity->variable.v.vla_base;
1618
1619         case DECLARATION_KIND_COMPOUND_MEMBER:
1620                 panic("not implemented reference type");
1621         }
1622
1623         panic("reference to declaration with unknown type found");
1624 }
1625
1626 static ir_node *reference_addr(const reference_expression_t *ref)
1627 {
1628         dbg_info *dbgi   = get_dbg_info(&ref->base.source_position);
1629         entity_t *entity = ref->entity;
1630         assert(is_declaration(entity));
1631
1632         switch((declaration_kind_t) entity->declaration.kind) {
1633         case DECLARATION_KIND_UNKNOWN:
1634                 break;
1635         case DECLARATION_KIND_PARAMETER:
1636         case DECLARATION_KIND_LOCAL_VARIABLE:
1637                 /* you can store to a local variable (so we don't panic but return NULL
1638                  * as an indicator for no real address) */
1639                 return NULL;
1640         case DECLARATION_KIND_GLOBAL_VARIABLE: {
1641                 ir_node *const addr = create_symconst(dbgi, entity->variable.v.entity);
1642                 return addr;
1643         }
1644         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY: {
1645                 ir_entity *irentity = entity->variable.v.entity;
1646                 ir_node   *frame    = get_local_frame(irentity);
1647                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1648
1649                 return sel;
1650         }
1651         case DECLARATION_KIND_PARAMETER_ENTITY: {
1652                 ir_entity *irentity = entity->parameter.v.entity;
1653                 ir_node   *frame    = get_local_frame(irentity);
1654                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1655
1656                 return sel;
1657         }
1658
1659         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
1660                 return entity->variable.v.vla_base;
1661
1662         case DECLARATION_KIND_FUNCTION: {
1663                 return create_symconst(dbgi, entity->function.irentity);
1664         }
1665
1666         case DECLARATION_KIND_INNER_FUNCTION: {
1667                 type_t  *const type = skip_typeref(entity->declaration.type);
1668                 ir_mode *const mode = get_ir_mode_storage(type);
1669                 if (!entity->function.goto_to_outer && !entity->function.need_closure) {
1670                         /* inner function not using the closure */
1671                         return create_symconst(dbgi, entity->function.irentity);
1672                 } else {
1673                         /* need trampoline here */
1674                         return create_trampoline(dbgi, mode, entity->function.irentity);
1675                 }
1676         }
1677
1678         case DECLARATION_KIND_COMPOUND_MEMBER:
1679                 panic("not implemented reference type");
1680         }
1681
1682         panic("reference to declaration with unknown type found");
1683 }
1684
1685 /**
1686  * Transform calls to builtin functions.
1687  */
1688 static ir_node *process_builtin_call(const call_expression_t *call)
1689 {
1690         dbg_info *dbgi = get_dbg_info(&call->base.source_position);
1691
1692         assert(call->function->kind == EXPR_REFERENCE);
1693         reference_expression_t *builtin = &call->function->reference;
1694
1695         type_t *expr_type = skip_typeref(builtin->base.type);
1696         assert(is_type_pointer(expr_type));
1697
1698         type_t *function_type = skip_typeref(expr_type->pointer.points_to);
1699
1700         switch (builtin->entity->function.btk) {
1701         case BUILTIN_NONE:
1702                 break;
1703         case BUILTIN_ALLOCA: {
1704                 expression_t *argument = call->arguments->expression;
1705                 ir_node      *size     = expression_to_firm(argument);
1706
1707                 ir_node *store  = get_store();
1708                 ir_node *alloca = new_d_Alloc(dbgi, store, size, get_unknown_type(),
1709                                               stack_alloc);
1710                 ir_node *proj_m = new_Proj(alloca, mode_M, pn_Alloc_M);
1711                 set_store(proj_m);
1712                 ir_node *res    = new_Proj(alloca, mode_P_data, pn_Alloc_res);
1713
1714                 return res;
1715         }
1716         case BUILTIN_INF: {
1717                 type_t    *type = function_type->function.return_type;
1718                 ir_mode   *mode = get_ir_mode_arithmetic(type);
1719                 ir_tarval *tv   = get_mode_infinite(mode);
1720                 ir_node   *res  = new_d_Const(dbgi, tv);
1721                 return res;
1722         }
1723         case BUILTIN_NAN: {
1724                 /* Ignore string for now... */
1725                 assert(is_type_function(function_type));
1726                 type_t    *type = function_type->function.return_type;
1727                 ir_mode   *mode = get_ir_mode_arithmetic(type);
1728                 ir_tarval *tv   = get_mode_NAN(mode);
1729                 ir_node   *res  = new_d_Const(dbgi, tv);
1730                 return res;
1731         }
1732         case BUILTIN_EXPECT: {
1733                 expression_t *argument = call->arguments->expression;
1734                 return _expression_to_firm(argument);
1735         }
1736         case BUILTIN_VA_END:
1737                 /* evaluate the argument of va_end for its side effects */
1738                 _expression_to_firm(call->arguments->expression);
1739                 return NULL;
1740         case BUILTIN_OBJECT_SIZE: {
1741                 /* determine value of "type" */
1742                 expression_t *type_expression = call->arguments->next->expression;
1743                 long          type_val        = fold_constant_to_int(type_expression);
1744                 type_t       *type            = function_type->function.return_type;
1745                 ir_mode      *mode            = get_ir_mode_arithmetic(type);
1746                 /* just produce a "I don't know" result */
1747                 ir_tarval    *result          = type_val & 2 ? get_mode_null(mode) :
1748                                                 get_mode_minus_one(mode);
1749
1750                 return new_d_Const(dbgi, result);
1751         }
1752         case BUILTIN_ROTL: {
1753                 ir_node *val  = expression_to_firm(call->arguments->expression);
1754                 ir_node *shf  = expression_to_firm(call->arguments->next->expression);
1755                 ir_mode *mode = get_irn_mode(val);
1756                 ir_mode *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1757                 return new_d_Rotl(dbgi, val, create_conv(dbgi, shf, mode_uint), mode);
1758         }
1759         case BUILTIN_ROTR: {
1760                 ir_node *val  = expression_to_firm(call->arguments->expression);
1761                 ir_node *shf  = expression_to_firm(call->arguments->next->expression);
1762                 ir_mode *mode = get_irn_mode(val);
1763                 ir_mode *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1764                 ir_node *c    = new_Const_long(mode_uint, get_mode_size_bits(mode));
1765                 ir_node *sub  = new_d_Sub(dbgi, c, create_conv(dbgi, shf, mode_uint), mode_uint);
1766                 return new_d_Rotl(dbgi, val, sub, mode);
1767         }
1768         case BUILTIN_FIRM:
1769                 break;
1770         case BUILTIN_LIBC:
1771         case BUILTIN_LIBC_CHECK:
1772                 panic("builtin did not produce an entity");
1773         }
1774         panic("invalid builtin found");
1775 }
1776
1777 /**
1778  * Transform a call expression.
1779  * Handles some special cases, like alloca() calls, which must be resolved
1780  * BEFORE the inlines runs. Inlining routines calling alloca() is dangerous,
1781  * 176.gcc for instance might allocate 2GB instead of 256 MB if alloca is not
1782  * handled right...
1783  */
1784 static ir_node *call_expression_to_firm(const call_expression_t *const call)
1785 {
1786         dbg_info *const dbgi = get_dbg_info(&call->base.source_position);
1787         assert(currently_reachable());
1788
1789         expression_t   *function = call->function;
1790         ir_node        *callee   = NULL;
1791         bool            firm_builtin = false;
1792         ir_builtin_kind firm_builtin_kind = ir_bk_trap;
1793         if (function->kind == EXPR_REFERENCE) {
1794                 const reference_expression_t *ref    = &function->reference;
1795                 entity_t                     *entity = ref->entity;
1796
1797                 if (entity->kind == ENTITY_FUNCTION) {
1798                         builtin_kind_t builtin = entity->function.btk;
1799                         if (builtin == BUILTIN_FIRM) {
1800                                 firm_builtin = true;
1801                                 firm_builtin_kind = entity->function.b.firm_builtin_kind;
1802                         } else if (builtin != BUILTIN_NONE && builtin != BUILTIN_LIBC
1803                                    && builtin != BUILTIN_LIBC_CHECK) {
1804                                 return process_builtin_call(call);
1805                         }
1806                 }
1807         }
1808         if (!firm_builtin)
1809                 callee = expression_to_firm(function);
1810
1811         type_t *type = skip_typeref(function->base.type);
1812         assert(is_type_pointer(type));
1813         pointer_type_t *pointer_type = &type->pointer;
1814         type_t         *points_to    = skip_typeref(pointer_type->points_to);
1815         assert(is_type_function(points_to));
1816         function_type_t *function_type = &points_to->function;
1817
1818         int      n_parameters    = 0;
1819         ir_type *ir_method_type  = get_ir_type((type_t*) function_type);
1820         ir_type *new_method_type = NULL;
1821         if (function_type->variadic || function_type->unspecified_parameters) {
1822                 const call_argument_t *argument = call->arguments;
1823                 for ( ; argument != NULL; argument = argument->next) {
1824                         ++n_parameters;
1825                 }
1826
1827                 /* we need to construct a new method type matching the call
1828                  * arguments... */
1829                 type_dbg_info *tdbgi = get_type_dbg_info_((const type_t*) function_type);
1830                 int n_res       = get_method_n_ress(ir_method_type);
1831                 new_method_type = new_d_type_method(n_parameters, n_res, tdbgi);
1832                 set_method_calling_convention(new_method_type,
1833                                get_method_calling_convention(ir_method_type));
1834                 set_method_additional_properties(new_method_type,
1835                                get_method_additional_properties(ir_method_type));
1836                 set_method_variadicity(new_method_type,
1837                                        get_method_variadicity(ir_method_type));
1838
1839                 for (int i = 0; i < n_res; ++i) {
1840                         set_method_res_type(new_method_type, i,
1841                                             get_method_res_type(ir_method_type, i));
1842                 }
1843                 argument = call->arguments;
1844                 for (int i = 0; i < n_parameters; ++i, argument = argument->next) {
1845                         expression_t *expression = argument->expression;
1846                         ir_type      *irtype     = get_ir_type(expression->base.type);
1847                         set_method_param_type(new_method_type, i, irtype);
1848                 }
1849                 ir_method_type = new_method_type;
1850         } else {
1851                 n_parameters = get_method_n_params(ir_method_type);
1852         }
1853
1854         ir_node *in[n_parameters];
1855
1856         const call_argument_t *argument = call->arguments;
1857         for (int n = 0; n < n_parameters; ++n) {
1858                 expression_t *expression = argument->expression;
1859                 ir_node      *arg_node   = expression_to_firm(expression);
1860
1861                 type_t *arg_type = skip_typeref(expression->base.type);
1862                 if (!is_type_compound(arg_type)) {
1863                         ir_mode *mode = get_ir_mode_storage(expression->base.type);
1864                         arg_node      = create_conv(dbgi, arg_node, mode);
1865                         arg_node      = do_strict_conv(dbgi, arg_node);
1866                 }
1867
1868                 in[n] = arg_node;
1869
1870                 argument = argument->next;
1871         }
1872
1873         ir_node *store;
1874         if (function_type->modifiers & DM_CONST) {
1875                 store = get_irg_no_mem(current_ir_graph);
1876         } else {
1877                 store = get_store();
1878         }
1879
1880         ir_node *node;
1881         type_t  *return_type = skip_typeref(function_type->return_type);
1882         ir_node *result      = NULL;
1883         if (firm_builtin) {
1884                 node = new_d_Builtin(dbgi, store, n_parameters, in, firm_builtin_kind,
1885                                      ir_method_type);
1886                 if (! (function_type->modifiers & DM_CONST)) {
1887                         ir_node *mem = new_Proj(node, mode_M, pn_Builtin_M);
1888                         set_store(mem);
1889                 }
1890
1891                 if (!is_type_void(return_type)) {
1892                         assert(is_type_scalar(return_type));
1893                         ir_mode *mode = get_ir_mode_storage(return_type);
1894                         result = new_Proj(node, mode, pn_Builtin_max+1);
1895                         ir_mode *mode_arith = get_ir_mode_arithmetic(return_type);
1896                         result              = create_conv(NULL, result, mode_arith);
1897                 }
1898         } else {
1899                 node = new_d_Call(dbgi, store, callee, n_parameters, in, ir_method_type);
1900                 if (! (function_type->modifiers & DM_CONST)) {
1901                         ir_node *mem = new_Proj(node, mode_M, pn_Call_M);
1902                         set_store(mem);
1903                 }
1904
1905                 if (!is_type_void(return_type)) {
1906                         ir_node *resproj = new_Proj(node, mode_T, pn_Call_T_result);
1907
1908                         if (is_type_scalar(return_type)) {
1909                                 ir_mode *mode       = get_ir_mode_storage(return_type);
1910                                 result              = new_Proj(resproj, mode, 0);
1911                                 ir_mode *mode_arith = get_ir_mode_arithmetic(return_type);
1912                                 result              = create_conv(NULL, result, mode_arith);
1913                         } else {
1914                                 ir_mode *mode = mode_P_data;
1915                                 result        = new_Proj(resproj, mode, 0);
1916                         }
1917                 }
1918         }
1919
1920         if (function_type->modifiers & DM_NORETURN) {
1921                 /* A dead end:  Keep the Call and the Block.  Also place all further
1922                  * nodes into a new and unreachable block. */
1923                 keep_alive(node);
1924                 keep_alive(get_cur_block());
1925                 ir_node *block = new_Block(0, NULL);
1926                 set_cur_block(block);
1927         }
1928
1929         return result;
1930 }
1931
1932 static ir_node *statement_to_firm(statement_t *statement);
1933 static ir_node *compound_statement_to_firm(compound_statement_t *compound);
1934
1935 static ir_node *expression_to_addr(const expression_t *expression);
1936 static ir_node *create_condition_evaluation(const expression_t *expression,
1937                                             ir_node *true_block,
1938                                             ir_node *false_block);
1939
1940 static void assign_value(dbg_info *dbgi, ir_node *addr, type_t *type,
1941                          ir_node *value)
1942 {
1943         if (!is_type_compound(type)) {
1944                 ir_mode *mode = get_ir_mode_storage(type);
1945                 value         = create_conv(dbgi, value, mode);
1946                 value         = do_strict_conv(dbgi, value);
1947         }
1948
1949         ir_node *memory = get_store();
1950
1951         if (is_type_scalar(type)) {
1952                 ir_cons_flags flags = type->base.qualifiers & TYPE_QUALIFIER_VOLATILE
1953                                       ? cons_volatile : cons_none;
1954                 ir_node  *store     = new_d_Store(dbgi, memory, addr, value, flags);
1955                 ir_node  *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
1956                 set_store(store_mem);
1957         } else {
1958                 ir_type *irtype    = get_ir_type(type);
1959                 ir_node *copyb     = new_d_CopyB(dbgi, memory, addr, value, irtype);
1960                 ir_node *copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
1961                 set_store(copyb_mem);
1962         }
1963 }
1964
1965 static ir_tarval *create_bitfield_mask(ir_mode *mode, int offset, int size)
1966 {
1967         ir_tarval *all_one   = get_mode_all_one(mode);
1968         int        mode_size = get_mode_size_bits(mode);
1969         ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1970
1971         assert(offset >= 0);
1972         assert(size   >= 0);
1973         assert(offset + size <= mode_size);
1974         if (size == mode_size) {
1975                 return all_one;
1976         }
1977
1978         long       shiftr    = get_mode_size_bits(mode) - size;
1979         long       shiftl    = offset;
1980         ir_tarval *tv_shiftr = new_tarval_from_long(shiftr, mode_uint);
1981         ir_tarval *tv_shiftl = new_tarval_from_long(shiftl, mode_uint);
1982         ir_tarval *mask0     = tarval_shr(all_one, tv_shiftr);
1983         ir_tarval *mask1     = tarval_shl(mask0, tv_shiftl);
1984
1985         return mask1;
1986 }
1987
1988 static ir_node *bitfield_store_to_firm(dbg_info *dbgi,
1989                 ir_entity *entity, ir_node *addr, ir_node *value, bool set_volatile,
1990                 bool need_return)
1991 {
1992         ir_type *entity_type = get_entity_type(entity);
1993         ir_type *base_type   = get_primitive_base_type(entity_type);
1994         ir_mode *mode        = get_type_mode(base_type);
1995         ir_mode *mode_uint   = atomic_modes[ATOMIC_TYPE_UINT];
1996
1997         value = create_conv(dbgi, value, mode);
1998
1999         /* kill upper bits of value and shift to right position */
2000         unsigned  bitoffset  = get_entity_offset_bits_remainder(entity);
2001         unsigned  bitsize    = get_mode_size_bits(get_type_mode(entity_type));
2002         unsigned  base_bits  = get_mode_size_bits(mode);
2003         unsigned  shiftwidth = base_bits - bitsize;
2004
2005         ir_node  *shiftcount = new_Const_long(mode_uint, shiftwidth);
2006         ir_node  *shiftl     = new_d_Shl(dbgi, value, shiftcount, mode);
2007
2008         unsigned  shrwidth   = base_bits - bitsize - bitoffset;
2009         ir_node  *shrconst   = new_Const_long(mode_uint, shrwidth);
2010         ir_node  *shiftr     = new_d_Shr(dbgi, shiftl, shrconst, mode);
2011
2012         /* load current value */
2013         ir_node   *mem             = get_store();
2014         ir_node   *load            = new_d_Load(dbgi, mem, addr, mode,
2015                                           set_volatile ? cons_volatile : cons_none);
2016         ir_node   *load_mem        = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
2017         ir_node   *load_res        = new_d_Proj(dbgi, load, mode, pn_Load_res);
2018         ir_tarval *shift_mask      = create_bitfield_mask(mode, bitoffset, bitsize);
2019         ir_tarval *inv_mask        = tarval_not(shift_mask);
2020         ir_node   *inv_mask_node   = new_d_Const(dbgi, inv_mask);
2021         ir_node   *load_res_masked = new_d_And(dbgi, load_res, inv_mask_node, mode);
2022
2023         /* construct new value and store */
2024         ir_node *new_val   = new_d_Or(dbgi, load_res_masked, shiftr, mode);
2025         ir_node *store     = new_d_Store(dbgi, load_mem, addr, new_val,
2026                                          set_volatile ? cons_volatile : cons_none);
2027         ir_node *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
2028         set_store(store_mem);
2029
2030         if (!need_return)
2031                 return NULL;
2032
2033         ir_node *res_shr;
2034         ir_node *count_res_shr = new_Const_long(mode_uint, base_bits - bitsize);
2035         if (mode_is_signed(mode)) {
2036                 res_shr = new_d_Shrs(dbgi, shiftl, count_res_shr, mode);
2037         } else {
2038                 res_shr = new_d_Shr(dbgi, shiftl, count_res_shr, mode);
2039         }
2040         return res_shr;
2041 }
2042
2043 static ir_node *bitfield_extract_to_firm(const select_expression_t *expression,
2044                                          ir_node *addr)
2045 {
2046         dbg_info *dbgi      = get_dbg_info(&expression->base.source_position);
2047         entity_t *entity    = expression->compound_entry;
2048         type_t   *base_type = entity->declaration.type;
2049         ir_mode  *mode      = get_ir_mode_storage(base_type);
2050         ir_node  *mem       = get_store();
2051         ir_node  *load      = new_d_Load(dbgi, mem, addr, mode, cons_none);
2052         ir_node  *load_mem  = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
2053         ir_node  *load_res  = new_d_Proj(dbgi, load, mode, pn_Load_res);
2054         ir_mode  *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
2055
2056         ir_mode  *amode     = mode;
2057         /* optimisation, since shifting in modes < machine_size is usually
2058          * less efficient */
2059         if (get_mode_size_bits(amode) < get_mode_size_bits(mode_uint)) {
2060                 amode = mode_uint;
2061         }
2062         unsigned amode_size = get_mode_size_bits(amode);
2063         load_res = create_conv(dbgi, load_res, amode);
2064
2065         set_store(load_mem);
2066
2067         /* kill upper bits */
2068         assert(expression->compound_entry->kind == ENTITY_COMPOUND_MEMBER);
2069         unsigned   bitoffset   = entity->compound_member.bit_offset;
2070         unsigned   bitsize     = entity->compound_member.bit_size;
2071         unsigned   shift_bitsl = amode_size - bitoffset - bitsize;
2072         ir_tarval *tvl         = new_tarval_from_long((long)shift_bitsl, mode_uint);
2073         ir_node   *countl      = new_d_Const(dbgi, tvl);
2074         ir_node   *shiftl      = new_d_Shl(dbgi, load_res, countl, amode);
2075
2076         unsigned   shift_bitsr = bitoffset + shift_bitsl;
2077         assert(shift_bitsr <= amode_size);
2078         ir_tarval *tvr         = new_tarval_from_long((long)shift_bitsr, mode_uint);
2079         ir_node   *countr      = new_d_Const(dbgi, tvr);
2080         ir_node   *shiftr;
2081         if (mode_is_signed(mode)) {
2082                 shiftr = new_d_Shrs(dbgi, shiftl, countr, amode);
2083         } else {
2084                 shiftr = new_d_Shr(dbgi, shiftl, countr, amode);
2085         }
2086
2087         type_t  *type    = expression->base.type;
2088         ir_mode *resmode = get_ir_mode_arithmetic(type);
2089         return create_conv(dbgi, shiftr, resmode);
2090 }
2091
2092 /* make sure the selected compound type is constructed */
2093 static void construct_select_compound(const select_expression_t *expression)
2094 {
2095         type_t *type = skip_typeref(expression->compound->base.type);
2096         if (is_type_pointer(type)) {
2097                 type = type->pointer.points_to;
2098         }
2099         (void) get_ir_type(type);
2100 }
2101
2102 static ir_node *set_value_for_expression_addr(const expression_t *expression,
2103                                               ir_node *value, ir_node *addr)
2104 {
2105         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2106         type_t   *type = skip_typeref(expression->base.type);
2107
2108         if (!is_type_compound(type)) {
2109                 ir_mode  *mode = get_ir_mode_storage(type);
2110                 value          = create_conv(dbgi, value, mode);
2111                 value          = do_strict_conv(dbgi, value);
2112         }
2113
2114         if (expression->kind == EXPR_REFERENCE) {
2115                 const reference_expression_t *ref = &expression->reference;
2116
2117                 entity_t *entity = ref->entity;
2118                 assert(is_declaration(entity));
2119                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2120                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE) {
2121                         set_value(entity->variable.v.value_number, value);
2122                         return value;
2123                 } else if (entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
2124                         set_value(entity->parameter.v.value_number, value);
2125                         return value;
2126                 }
2127         }
2128
2129         if (addr == NULL)
2130                 addr = expression_to_addr(expression);
2131         assert(addr != NULL);
2132
2133         if (expression->kind == EXPR_SELECT) {
2134                 const select_expression_t *select = &expression->select;
2135
2136                 construct_select_compound(select);
2137
2138                 entity_t *entity = select->compound_entry;
2139                 assert(entity->kind == ENTITY_COMPOUND_MEMBER);
2140                 if (entity->compound_member.bitfield) {
2141                         ir_entity *irentity = entity->compound_member.entity;
2142                         bool       set_volatile
2143                                 = select->base.type->base.qualifiers & TYPE_QUALIFIER_VOLATILE;
2144                         value = bitfield_store_to_firm(dbgi, irentity, addr, value,
2145                                                        set_volatile, true);
2146                         return value;
2147                 }
2148         }
2149
2150         assign_value(dbgi, addr, type, value);
2151         return value;
2152 }
2153
2154 static void set_value_for_expression(const expression_t *expression,
2155                                      ir_node *value)
2156 {
2157         set_value_for_expression_addr(expression, value, NULL);
2158 }
2159
2160 static ir_node *get_value_from_lvalue(const expression_t *expression,
2161                                       ir_node *addr)
2162 {
2163         if (expression->kind == EXPR_REFERENCE) {
2164                 const reference_expression_t *ref = &expression->reference;
2165
2166                 entity_t *entity = ref->entity;
2167                 assert(entity->kind == ENTITY_VARIABLE
2168                                 || entity->kind == ENTITY_PARAMETER);
2169                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2170                 int value_number;
2171                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE) {
2172                         value_number = entity->variable.v.value_number;
2173                         assert(addr == NULL);
2174                         type_t  *type = skip_typeref(expression->base.type);
2175                         ir_mode *mode = get_ir_mode_storage(type);
2176                         ir_node *res  = get_value(value_number, mode);
2177                         return create_conv(NULL, res, get_ir_mode_arithmetic(type));
2178                 } else if (entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
2179                         value_number = entity->parameter.v.value_number;
2180                         assert(addr == NULL);
2181                         type_t  *type = skip_typeref(expression->base.type);
2182                         ir_mode *mode = get_ir_mode_storage(type);
2183                         ir_node *res  = get_value(value_number, mode);
2184                         return create_conv(NULL, res, get_ir_mode_arithmetic(type));
2185                 }
2186         }
2187
2188         assert(addr != NULL);
2189         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2190
2191         ir_node *value;
2192         if (expression->kind == EXPR_SELECT &&
2193             expression->select.compound_entry->compound_member.bitfield) {
2194             construct_select_compound(&expression->select);
2195                 value = bitfield_extract_to_firm(&expression->select, addr);
2196         } else {
2197                 value = deref_address(dbgi, expression->base.type, addr);
2198         }
2199
2200         return value;
2201 }
2202
2203
2204 static ir_node *create_incdec(const unary_expression_t *expression)
2205 {
2206         dbg_info *const     dbgi = get_dbg_info(&expression->base.source_position);
2207         const expression_t *value_expr = expression->value;
2208         ir_node            *addr       = expression_to_addr(value_expr);
2209         ir_node            *value      = get_value_from_lvalue(value_expr, addr);
2210
2211         type_t  *type = skip_typeref(expression->base.type);
2212         ir_mode *mode = get_ir_mode_arithmetic(expression->base.type);
2213
2214         ir_node *offset;
2215         if (is_type_pointer(type)) {
2216                 pointer_type_t *pointer_type = &type->pointer;
2217                 offset = get_type_size_node(pointer_type->points_to);
2218         } else {
2219                 assert(is_type_arithmetic(type));
2220                 offset = new_Const(get_mode_one(mode));
2221         }
2222
2223         ir_node *result;
2224         ir_node *store_value;
2225         switch(expression->base.kind) {
2226         case EXPR_UNARY_POSTFIX_INCREMENT:
2227                 result      = value;
2228                 store_value = new_d_Add(dbgi, value, offset, mode);
2229                 break;
2230         case EXPR_UNARY_POSTFIX_DECREMENT:
2231                 result      = value;
2232                 store_value = new_d_Sub(dbgi, value, offset, mode);
2233                 break;
2234         case EXPR_UNARY_PREFIX_INCREMENT:
2235                 result      = new_d_Add(dbgi, value, offset, mode);
2236                 store_value = result;
2237                 break;
2238         case EXPR_UNARY_PREFIX_DECREMENT:
2239                 result      = new_d_Sub(dbgi, value, offset, mode);
2240                 store_value = result;
2241                 break;
2242         default:
2243                 panic("no incdec expr in create_incdec");
2244         }
2245
2246         set_value_for_expression_addr(value_expr, store_value, addr);
2247
2248         return result;
2249 }
2250
2251 static bool is_local_variable(expression_t *expression)
2252 {
2253         if (expression->kind != EXPR_REFERENCE)
2254                 return false;
2255         reference_expression_t *ref_expr = &expression->reference;
2256         entity_t               *entity   = ref_expr->entity;
2257         if (entity->kind != ENTITY_VARIABLE)
2258                 return false;
2259         assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2260         return entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE;
2261 }
2262
2263 static ir_relation get_relation(const expression_kind_t kind)
2264 {
2265         switch(kind) {
2266         case EXPR_BINARY_EQUAL:         return ir_relation_equal;
2267         case EXPR_BINARY_ISLESSGREATER: return ir_relation_less_greater;
2268         case EXPR_BINARY_NOTEQUAL:      return ir_relation_unordered_less_greater;
2269         case EXPR_BINARY_ISLESS:
2270         case EXPR_BINARY_LESS:          return ir_relation_less;
2271         case EXPR_BINARY_ISLESSEQUAL:
2272         case EXPR_BINARY_LESSEQUAL:     return ir_relation_less_equal;
2273         case EXPR_BINARY_ISGREATER:
2274         case EXPR_BINARY_GREATER:       return ir_relation_greater;
2275         case EXPR_BINARY_ISGREATEREQUAL:
2276         case EXPR_BINARY_GREATEREQUAL:  return ir_relation_greater_equal;
2277         case EXPR_BINARY_ISUNORDERED:   return ir_relation_unordered;
2278
2279         default:
2280                 break;
2281         }
2282         panic("trying to get pn_Cmp from non-comparison binexpr type");
2283 }
2284
2285 /**
2286  * Handle the assume optimizer hint: check if a Confirm
2287  * node can be created.
2288  *
2289  * @param dbi    debug info
2290  * @param expr   the IL assume expression
2291  *
2292  * we support here only some simple cases:
2293  *  - var rel const
2294  *  - const rel val
2295  *  - var rel var
2296  */
2297 static ir_node *handle_assume_compare(dbg_info *dbi,
2298                                       const binary_expression_t *expression)
2299 {
2300         expression_t *op1 = expression->left;
2301         expression_t *op2 = expression->right;
2302         entity_t     *var2, *var = NULL;
2303         ir_node      *res      = NULL;
2304         ir_relation   relation = get_relation(expression->base.kind);
2305
2306         if (is_local_variable(op1) && is_local_variable(op2)) {
2307                 var  = op1->reference.entity;
2308             var2 = op2->reference.entity;
2309
2310                 type_t  *const type = skip_typeref(var->declaration.type);
2311                 ir_mode *const mode = get_ir_mode_storage(type);
2312
2313                 ir_node *const irn1 = get_value(var->variable.v.value_number, mode);
2314                 ir_node *const irn2 = get_value(var2->variable.v.value_number, mode);
2315
2316                 res = new_d_Confirm(dbi, irn2, irn1, get_inversed_relation(relation));
2317                 set_value(var2->variable.v.value_number, res);
2318
2319                 res = new_d_Confirm(dbi, irn1, irn2, relation);
2320                 set_value(var->variable.v.value_number, res);
2321
2322                 return res;
2323         }
2324
2325         expression_t *con = NULL;
2326         if (is_local_variable(op1) && is_constant_expression(op2) == EXPR_CLASS_CONSTANT) {
2327                 var = op1->reference.entity;
2328                 con = op2;
2329         } else if (is_constant_expression(op1) == EXPR_CLASS_CONSTANT && is_local_variable(op2)) {
2330                 relation = get_inversed_relation(relation);
2331                 var = op2->reference.entity;
2332                 con = op1;
2333         }
2334
2335         if (var != NULL) {
2336                 type_t  *const type = skip_typeref(var->declaration.type);
2337                 ir_mode *const mode = get_ir_mode_storage(type);
2338
2339                 res = get_value(var->variable.v.value_number, mode);
2340                 res = new_d_Confirm(dbi, res, expression_to_firm(con), relation);
2341                 set_value(var->variable.v.value_number, res);
2342         }
2343         return res;
2344 }
2345
2346 /**
2347  * Handle the assume optimizer hint.
2348  *
2349  * @param dbi    debug info
2350  * @param expr   the IL assume expression
2351  */
2352 static ir_node *handle_assume(dbg_info *dbi, const expression_t *expression)
2353 {
2354         switch(expression->kind) {
2355         case EXPR_BINARY_EQUAL:
2356         case EXPR_BINARY_NOTEQUAL:
2357         case EXPR_BINARY_LESS:
2358         case EXPR_BINARY_LESSEQUAL:
2359         case EXPR_BINARY_GREATER:
2360         case EXPR_BINARY_GREATEREQUAL:
2361                 return handle_assume_compare(dbi, &expression->binary);
2362         default:
2363                 return NULL;
2364         }
2365 }
2366
2367 static ir_node *create_cast(dbg_info *dbgi, ir_node *value_node,
2368                             type_t *from_type, type_t *type)
2369 {
2370         type = skip_typeref(type);
2371         if (is_type_void(type)) {
2372                 /* make sure firm type is constructed */
2373                 (void) get_ir_type(type);
2374                 return NULL;
2375         }
2376         if (!is_type_scalar(type)) {
2377                 /* make sure firm type is constructed */
2378                 (void) get_ir_type(type);
2379                 return value_node;
2380         }
2381
2382         from_type     = skip_typeref(from_type);
2383         ir_mode *mode = get_ir_mode_storage(type);
2384         /* check for conversion from / to __based types */
2385         if (is_type_pointer(type) && is_type_pointer(from_type)) {
2386                 const variable_t *from_var = from_type->pointer.base_variable;
2387                 const variable_t *to_var   = type->pointer.base_variable;
2388                 if (from_var != to_var) {
2389                         if (from_var != NULL) {
2390                                 ir_node *const addr = create_symconst(dbgi, from_var->v.entity);
2391                                 ir_node *const base = deref_address(dbgi, from_var->base.type, addr);
2392                                 value_node = new_d_Add(dbgi, value_node, base, get_ir_mode_storage(from_type));
2393                         }
2394                         if (to_var != NULL) {
2395                                 ir_node *const addr = create_symconst(dbgi, to_var->v.entity);
2396                                 ir_node *const base = deref_address(dbgi, to_var->base.type, addr);
2397                                 value_node = new_d_Sub(dbgi, value_node, base, mode);
2398                         }
2399                 }
2400         }
2401
2402         if (is_type_atomic(type, ATOMIC_TYPE_BOOL)) {
2403                 /* bool adjustments (we save a mode_Bu, but have to temporarily
2404                  * convert to mode_b so we only get a 0/1 value */
2405                 value_node = create_conv(dbgi, value_node, mode_b);
2406         }
2407
2408         ir_mode *mode_arith = get_ir_mode_arithmetic(type);
2409         ir_node *node       = create_conv(dbgi, value_node, mode);
2410         node                = do_strict_conv(dbgi, node);
2411         node                = create_conv(dbgi, node, mode_arith);
2412
2413         return node;
2414 }
2415
2416 static ir_node *unary_expression_to_firm(const unary_expression_t *expression)
2417 {
2418         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2419         type_t   *type = skip_typeref(expression->base.type);
2420
2421         const expression_t *value = expression->value;
2422
2423         switch(expression->base.kind) {
2424         case EXPR_UNARY_TAKE_ADDRESS:
2425                 return expression_to_addr(value);
2426
2427         case EXPR_UNARY_NEGATE: {
2428                 ir_node *value_node = expression_to_firm(value);
2429                 ir_mode *mode       = get_ir_mode_arithmetic(type);
2430                 return new_d_Minus(dbgi, value_node, mode);
2431         }
2432         case EXPR_UNARY_PLUS:
2433                 return expression_to_firm(value);
2434         case EXPR_UNARY_BITWISE_NEGATE: {
2435                 ir_node *value_node = expression_to_firm(value);
2436                 ir_mode *mode       = get_ir_mode_arithmetic(type);
2437                 return new_d_Not(dbgi, value_node, mode);
2438         }
2439         case EXPR_UNARY_NOT: {
2440                 ir_node *value_node = _expression_to_firm(value);
2441                 value_node          = create_conv(dbgi, value_node, mode_b);
2442                 ir_node *res        = new_d_Not(dbgi, value_node, mode_b);
2443                 return res;
2444         }
2445         case EXPR_UNARY_DEREFERENCE: {
2446                 ir_node *value_node = expression_to_firm(value);
2447                 type_t  *value_type = skip_typeref(value->base.type);
2448                 assert(is_type_pointer(value_type));
2449
2450                 /* check for __based */
2451                 const variable_t *const base_var = value_type->pointer.base_variable;
2452                 if (base_var != NULL) {
2453                         ir_node *const addr = create_symconst(dbgi, base_var->v.entity);
2454                         ir_node *const base = deref_address(dbgi, base_var->base.type, addr);
2455                         value_node = new_d_Add(dbgi, value_node, base, get_ir_mode_storage(value_type));
2456                 }
2457                 type_t  *points_to  = value_type->pointer.points_to;
2458                 return deref_address(dbgi, points_to, value_node);
2459         }
2460         case EXPR_UNARY_POSTFIX_INCREMENT:
2461         case EXPR_UNARY_POSTFIX_DECREMENT:
2462         case EXPR_UNARY_PREFIX_INCREMENT:
2463         case EXPR_UNARY_PREFIX_DECREMENT:
2464                 return create_incdec(expression);
2465         case EXPR_UNARY_CAST: {
2466                 ir_node *value_node = expression_to_firm(value);
2467                 type_t  *from_type  = value->base.type;
2468                 return create_cast(dbgi, value_node, from_type, type);
2469         }
2470         case EXPR_UNARY_ASSUME:
2471                 return handle_assume(dbgi, value);
2472
2473         default:
2474                 break;
2475         }
2476         panic("invalid UNEXPR type found");
2477 }
2478
2479 /**
2480  * produces a 0/1 depending of the value of a mode_b node
2481  */
2482 static ir_node *produce_condition_result(const expression_t *expression,
2483                                          ir_mode *mode, dbg_info *dbgi)
2484 {
2485         ir_node *const one_block  = new_immBlock();
2486         ir_node *const zero_block = new_immBlock();
2487         create_condition_evaluation(expression, one_block, zero_block);
2488         mature_immBlock(one_block);
2489         mature_immBlock(zero_block);
2490
2491         ir_node *const jmp_one  = new_rd_Jmp(dbgi, one_block);
2492         ir_node *const jmp_zero = new_rd_Jmp(dbgi, zero_block);
2493         ir_node *const in_cf[2] = { jmp_one, jmp_zero };
2494         ir_node *const block    = new_Block(lengthof(in_cf), in_cf);
2495         set_cur_block(block);
2496
2497         ir_node *const one   = new_Const(get_mode_one(mode));
2498         ir_node *const zero  = new_Const(get_mode_null(mode));
2499         ir_node *const in[2] = { one, zero };
2500         ir_node *const val   = new_d_Phi(dbgi, lengthof(in), in, mode);
2501
2502         return val;
2503 }
2504
2505 static ir_node *adjust_for_pointer_arithmetic(dbg_info *dbgi,
2506                 ir_node *value, type_t *type)
2507 {
2508         ir_mode        *const mode         = get_ir_mode_arithmetic(type_ptrdiff_t);
2509         assert(is_type_pointer(type));
2510         pointer_type_t *const pointer_type = &type->pointer;
2511         type_t         *const points_to    = skip_typeref(pointer_type->points_to);
2512         ir_node        *      elem_size    = get_type_size_node(points_to);
2513         elem_size                          = create_conv(dbgi, elem_size, mode);
2514         value                              = create_conv(dbgi, value,     mode);
2515         ir_node        *const mul          = new_d_Mul(dbgi, value, elem_size, mode);
2516         return mul;
2517 }
2518
2519 static ir_node *create_op(dbg_info *dbgi, const binary_expression_t *expression,
2520                           ir_node *left, ir_node *right)
2521 {
2522         ir_mode  *mode;
2523         type_t   *type_left  = skip_typeref(expression->left->base.type);
2524         type_t   *type_right = skip_typeref(expression->right->base.type);
2525
2526         expression_kind_t kind = expression->base.kind;
2527
2528         switch (kind) {
2529         case EXPR_BINARY_SHIFTLEFT:
2530         case EXPR_BINARY_SHIFTRIGHT:
2531         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2532         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2533                 mode  = get_ir_mode_arithmetic(expression->base.type);
2534                 right = create_conv(dbgi, right, atomic_modes[ATOMIC_TYPE_UINT]);
2535                 break;
2536
2537         case EXPR_BINARY_SUB:
2538                 if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
2539                         const pointer_type_t *const ptr_type = &type_left->pointer;
2540
2541                         mode = get_ir_mode_arithmetic(expression->base.type);
2542                         ir_node *const elem_size = get_type_size_node(ptr_type->points_to);
2543                         ir_node *const conv_size = new_d_Conv(dbgi, elem_size, mode);
2544                         ir_node *const sub       = new_d_Sub(dbgi, left, right, mode);
2545                         ir_node *const no_mem    = new_NoMem();
2546                         ir_node *const div       = new_d_DivRL(dbgi, no_mem, sub, conv_size,
2547                                                                                                    mode, op_pin_state_floats);
2548                         return new_d_Proj(dbgi, div, mode, pn_Div_res);
2549                 }
2550                 /* fallthrough */
2551         case EXPR_BINARY_SUB_ASSIGN:
2552                 if (is_type_pointer(type_left)) {
2553                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2554                         mode  = get_ir_mode_arithmetic(type_left);
2555                         break;
2556                 }
2557                 goto normal_node;
2558
2559         case EXPR_BINARY_ADD:
2560         case EXPR_BINARY_ADD_ASSIGN:
2561                 if (is_type_pointer(type_left)) {
2562                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2563                         mode  = get_ir_mode_arithmetic(type_left);
2564                         break;
2565                 } else if (is_type_pointer(type_right)) {
2566                         left  = adjust_for_pointer_arithmetic(dbgi, left, type_right);
2567                         mode  = get_ir_mode_arithmetic(type_right);
2568                         break;
2569                 }
2570                 goto normal_node;
2571
2572         default:
2573 normal_node:
2574                 mode = get_ir_mode_arithmetic(type_right);
2575                 left = create_conv(dbgi, left, mode);
2576                 break;
2577         }
2578
2579         switch (kind) {
2580         case EXPR_BINARY_ADD_ASSIGN:
2581         case EXPR_BINARY_ADD:
2582                 return new_d_Add(dbgi, left, right, mode);
2583         case EXPR_BINARY_SUB_ASSIGN:
2584         case EXPR_BINARY_SUB:
2585                 return new_d_Sub(dbgi, left, right, mode);
2586         case EXPR_BINARY_MUL_ASSIGN:
2587         case EXPR_BINARY_MUL:
2588                 return new_d_Mul(dbgi, left, right, mode);
2589         case EXPR_BINARY_BITWISE_AND:
2590         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2591                 return new_d_And(dbgi, left, right, mode);
2592         case EXPR_BINARY_BITWISE_OR:
2593         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2594                 return new_d_Or(dbgi, left, right, mode);
2595         case EXPR_BINARY_BITWISE_XOR:
2596         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2597                 return new_d_Eor(dbgi, left, right, mode);
2598         case EXPR_BINARY_SHIFTLEFT:
2599         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2600                 return new_d_Shl(dbgi, left, right, mode);
2601         case EXPR_BINARY_SHIFTRIGHT:
2602         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2603                 if (mode_is_signed(mode)) {
2604                         return new_d_Shrs(dbgi, left, right, mode);
2605                 } else {
2606                         return new_d_Shr(dbgi, left, right, mode);
2607                 }
2608         case EXPR_BINARY_DIV:
2609         case EXPR_BINARY_DIV_ASSIGN: {
2610                 ir_node *pin = new_Pin(new_NoMem());
2611                 ir_node *op  = new_d_Div(dbgi, pin, left, right, mode,
2612                                          op_pin_state_floats);
2613                 ir_node *res = new_d_Proj(dbgi, op, mode, pn_Div_res);
2614                 return res;
2615         }
2616         case EXPR_BINARY_MOD:
2617         case EXPR_BINARY_MOD_ASSIGN: {
2618                 ir_node *pin = new_Pin(new_NoMem());
2619                 assert(!mode_is_float(mode));
2620                 ir_node *op  = new_d_Mod(dbgi, pin, left, right, mode,
2621                                          op_pin_state_floats);
2622                 ir_node *res = new_d_Proj(dbgi, op, mode, pn_Mod_res);
2623                 return res;
2624         }
2625         default:
2626                 panic("unexpected expression kind");
2627         }
2628 }
2629
2630 static ir_node *create_lazy_op(const binary_expression_t *expression)
2631 {
2632         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2633         type_t   *type = skip_typeref(expression->base.type);
2634         ir_mode  *mode = get_ir_mode_arithmetic(type);
2635
2636         if (is_constant_expression(expression->left) == EXPR_CLASS_CONSTANT) {
2637                 bool val = fold_constant_to_bool(expression->left);
2638                 expression_kind_t ekind = expression->base.kind;
2639                 assert(ekind == EXPR_BINARY_LOGICAL_AND || ekind == EXPR_BINARY_LOGICAL_OR);
2640                 if (ekind == EXPR_BINARY_LOGICAL_AND) {
2641                         if (!val) {
2642                                 return new_Const(get_mode_null(mode));
2643                         }
2644                 } else {
2645                         if (val) {
2646                                 return new_Const(get_mode_one(mode));
2647                         }
2648                 }
2649
2650                 if (is_constant_expression(expression->right) == EXPR_CLASS_CONSTANT) {
2651                         bool valr = fold_constant_to_bool(expression->right);
2652                         return create_Const_from_bool(mode, valr);
2653                 }
2654
2655                 return produce_condition_result(expression->right, mode, dbgi);
2656         }
2657
2658         return produce_condition_result((const expression_t*) expression, mode,
2659                                         dbgi);
2660 }
2661
2662 typedef ir_node * (*create_arithmetic_func)(dbg_info *dbgi, ir_node *left,
2663                                             ir_node *right, ir_mode *mode);
2664
2665 static ir_node *create_assign_binop(const binary_expression_t *expression)
2666 {
2667         dbg_info *const     dbgi = get_dbg_info(&expression->base.source_position);
2668         const expression_t *left_expr = expression->left;
2669         type_t             *type      = skip_typeref(left_expr->base.type);
2670         ir_node            *right     = expression_to_firm(expression->right);
2671         ir_node            *left_addr = expression_to_addr(left_expr);
2672         ir_node            *left      = get_value_from_lvalue(left_expr, left_addr);
2673         ir_node            *result    = create_op(dbgi, expression, left, right);
2674
2675         result = create_cast(dbgi, result, expression->right->base.type, type);
2676         result = do_strict_conv(dbgi, result);
2677
2678         result = set_value_for_expression_addr(left_expr, result, left_addr);
2679
2680         if (!is_type_compound(type)) {
2681                 ir_mode *mode_arithmetic = get_ir_mode_arithmetic(type);
2682                 result = create_conv(dbgi, result, mode_arithmetic);
2683         }
2684         return result;
2685 }
2686
2687 static ir_node *binary_expression_to_firm(const binary_expression_t *expression)
2688 {
2689         expression_kind_t kind = expression->base.kind;
2690
2691         switch(kind) {
2692         case EXPR_BINARY_EQUAL:
2693         case EXPR_BINARY_NOTEQUAL:
2694         case EXPR_BINARY_LESS:
2695         case EXPR_BINARY_LESSEQUAL:
2696         case EXPR_BINARY_GREATER:
2697         case EXPR_BINARY_GREATEREQUAL:
2698         case EXPR_BINARY_ISGREATER:
2699         case EXPR_BINARY_ISGREATEREQUAL:
2700         case EXPR_BINARY_ISLESS:
2701         case EXPR_BINARY_ISLESSEQUAL:
2702         case EXPR_BINARY_ISLESSGREATER:
2703         case EXPR_BINARY_ISUNORDERED: {
2704                 dbg_info   *dbgi     = get_dbg_info(&expression->base.source_position);
2705                 ir_node    *left     = expression_to_firm(expression->left);
2706                 ir_node    *right    = expression_to_firm(expression->right);
2707                 ir_relation relation = get_relation(kind);
2708                 ir_node    *cmp      = new_d_Cmp(dbgi, left, right, relation);
2709                 return cmp;
2710         }
2711         case EXPR_BINARY_ASSIGN: {
2712                 ir_node *addr  = expression_to_addr(expression->left);
2713                 ir_node *right = expression_to_firm(expression->right);
2714                 ir_node *res
2715                         = set_value_for_expression_addr(expression->left, right, addr);
2716
2717                 type_t  *type            = skip_typeref(expression->base.type);
2718                 if (!is_type_compound(type)) {
2719                         ir_mode *mode_arithmetic = get_ir_mode_arithmetic(type);
2720                         res                      = create_conv(NULL, res, mode_arithmetic);
2721                 }
2722                 return res;
2723         }
2724         case EXPR_BINARY_ADD:
2725         case EXPR_BINARY_SUB:
2726         case EXPR_BINARY_MUL:
2727         case EXPR_BINARY_DIV:
2728         case EXPR_BINARY_MOD:
2729         case EXPR_BINARY_BITWISE_AND:
2730         case EXPR_BINARY_BITWISE_OR:
2731         case EXPR_BINARY_BITWISE_XOR:
2732         case EXPR_BINARY_SHIFTLEFT:
2733         case EXPR_BINARY_SHIFTRIGHT:
2734         {
2735                 dbg_info *dbgi  = get_dbg_info(&expression->base.source_position);
2736                 ir_node  *left  = expression_to_firm(expression->left);
2737                 ir_node  *right = expression_to_firm(expression->right);
2738                 return create_op(dbgi, expression, left, right);
2739         }
2740         case EXPR_BINARY_LOGICAL_AND:
2741         case EXPR_BINARY_LOGICAL_OR:
2742                 return create_lazy_op(expression);
2743         case EXPR_BINARY_COMMA:
2744                 /* create side effects of left side */
2745                 (void) expression_to_firm(expression->left);
2746                 return _expression_to_firm(expression->right);
2747
2748         case EXPR_BINARY_ADD_ASSIGN:
2749         case EXPR_BINARY_SUB_ASSIGN:
2750         case EXPR_BINARY_MUL_ASSIGN:
2751         case EXPR_BINARY_MOD_ASSIGN:
2752         case EXPR_BINARY_DIV_ASSIGN:
2753         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2754         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2755         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2756         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2757         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2758                 return create_assign_binop(expression);
2759         default:
2760                 panic("TODO binexpr type");
2761         }
2762 }
2763
2764 static ir_node *array_access_addr(const array_access_expression_t *expression)
2765 {
2766         dbg_info *dbgi        = get_dbg_info(&expression->base.source_position);
2767         ir_node  *base_addr   = expression_to_firm(expression->array_ref);
2768         ir_node  *offset      = expression_to_firm(expression->index);
2769         type_t   *ref_type    = skip_typeref(expression->array_ref->base.type);
2770         ir_node  *real_offset = adjust_for_pointer_arithmetic(dbgi, offset, ref_type);
2771         ir_node  *result      = new_d_Add(dbgi, base_addr, real_offset, mode_P_data);
2772
2773         return result;
2774 }
2775
2776 static ir_node *array_access_to_firm(
2777                 const array_access_expression_t *expression)
2778 {
2779         dbg_info *dbgi   = get_dbg_info(&expression->base.source_position);
2780         ir_node  *addr   = array_access_addr(expression);
2781         type_t   *type   = revert_automatic_type_conversion(
2782                         (const expression_t*) expression);
2783         type             = skip_typeref(type);
2784
2785         return deref_address(dbgi, type, addr);
2786 }
2787
2788 static long get_offsetof_offset(const offsetof_expression_t *expression)
2789 {
2790         type_t *orig_type = expression->type;
2791         long    offset    = 0;
2792
2793         designator_t *designator = expression->designator;
2794         for ( ; designator != NULL; designator = designator->next) {
2795                 type_t *type = skip_typeref(orig_type);
2796                 /* be sure the type is constructed */
2797                 (void) get_ir_type(type);
2798
2799                 if (designator->symbol != NULL) {
2800                         assert(is_type_compound(type));
2801                         symbol_t *symbol = designator->symbol;
2802
2803                         compound_t *compound = type->compound.compound;
2804                         entity_t   *iter     = compound->members.entities;
2805                         for ( ; iter != NULL; iter = iter->base.next) {
2806                                 if (iter->base.symbol == symbol) {
2807                                         break;
2808                                 }
2809                         }
2810                         assert(iter != NULL);
2811
2812                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
2813                         assert(iter->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
2814                         offset += get_entity_offset(iter->compound_member.entity);
2815
2816                         orig_type = iter->declaration.type;
2817                 } else {
2818                         expression_t *array_index = designator->array_index;
2819                         assert(designator->array_index != NULL);
2820                         assert(is_type_array(type));
2821
2822                         long index         = fold_constant_to_int(array_index);
2823                         ir_type *arr_type  = get_ir_type(type);
2824                         ir_type *elem_type = get_array_element_type(arr_type);
2825                         long     elem_size = get_type_size_bytes(elem_type);
2826
2827                         offset += index * elem_size;
2828
2829                         orig_type = type->array.element_type;
2830                 }
2831         }
2832
2833         return offset;
2834 }
2835
2836 static ir_node *offsetof_to_firm(const offsetof_expression_t *expression)
2837 {
2838         ir_mode   *mode   = get_ir_mode_arithmetic(expression->base.type);
2839         long       offset = get_offsetof_offset(expression);
2840         ir_tarval *tv     = new_tarval_from_long(offset, mode);
2841         dbg_info  *dbgi   = get_dbg_info(&expression->base.source_position);
2842
2843         return new_d_Const(dbgi, tv);
2844 }
2845
2846 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
2847                                      ir_entity *entity, type_t *type);
2848 static ir_initializer_t *create_ir_initializer(
2849                 const initializer_t *initializer, type_t *type);
2850
2851 static ir_entity *create_initializer_entity(dbg_info *dbgi,
2852                                             initializer_t *initializer,
2853                                             type_t *type)
2854 {
2855         /* create the ir_initializer */
2856         ir_graph *const old_current_ir_graph = current_ir_graph;
2857         current_ir_graph = get_const_code_irg();
2858
2859         ir_initializer_t *irinitializer = create_ir_initializer(initializer, type);
2860
2861         assert(current_ir_graph == get_const_code_irg());
2862         current_ir_graph = old_current_ir_graph;
2863
2864         ident     *const id          = id_unique("initializer.%u");
2865         ir_type   *const irtype      = get_ir_type(type);
2866         ir_type   *const global_type = get_glob_type();
2867         ir_entity *const entity      = new_d_entity(global_type, id, irtype, dbgi);
2868         set_entity_ld_ident(entity, id);
2869         set_entity_visibility(entity, ir_visibility_private);
2870         add_entity_linkage(entity, IR_LINKAGE_CONSTANT);
2871         set_entity_initializer(entity, irinitializer);
2872         return entity;
2873 }
2874
2875 static ir_node *compound_literal_addr(compound_literal_expression_t const *const expression)
2876 {
2877         dbg_info      *dbgi        = get_dbg_info(&expression->base.source_position);
2878         type_t        *type        = expression->type;
2879         initializer_t *initializer = expression->initializer;
2880
2881         if (is_constant_initializer(initializer) == EXPR_CLASS_CONSTANT) {
2882                 ir_entity *entity = create_initializer_entity(dbgi, initializer, type);
2883                 return create_symconst(dbgi, entity);
2884         } else {
2885                 /* create an entity on the stack */
2886                 ident   *const id     = id_unique("CompLit.%u");
2887                 ir_type *const irtype = get_ir_type(type);
2888                 ir_type *frame_type   = get_irg_frame_type(current_ir_graph);
2889
2890                 ir_entity *const entity = new_d_entity(frame_type, id, irtype, dbgi);
2891                 set_entity_ld_ident(entity, id);
2892
2893                 /* create initialisation code */
2894                 create_local_initializer(initializer, dbgi, entity, type);
2895
2896                 /* create a sel for the compound literal address */
2897                 ir_node *frame = get_irg_frame(current_ir_graph);
2898                 ir_node *sel   = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
2899                 return sel;
2900         }
2901 }
2902
2903 static ir_node *compound_literal_to_firm(compound_literal_expression_t const* const expr)
2904 {
2905         dbg_info *const dbgi = get_dbg_info(&expr->base.source_position);
2906         type_t   *const type = expr->type;
2907         ir_node  *const addr = compound_literal_addr(expr);
2908         return deref_address(dbgi, type, addr);
2909 }
2910
2911 /**
2912  * Transform a sizeof expression into Firm code.
2913  */
2914 static ir_node *sizeof_to_firm(const typeprop_expression_t *expression)
2915 {
2916         type_t *const type = skip_typeref(expression->type);
2917         /* §6.5.3.4:2 if the type is a VLA, evaluate the expression. */
2918         if (is_type_array(type) && type->array.is_vla
2919                         && expression->tp_expression != NULL) {
2920                 expression_to_firm(expression->tp_expression);
2921         }
2922         /* strange gnu extensions: sizeof(function) == 1 */
2923         if (is_type_function(type)) {
2924                 ir_mode *mode = get_ir_mode_storage(type_size_t);
2925                 return new_Const(get_mode_one(mode));
2926         }
2927
2928         return get_type_size_node(type);
2929 }
2930
2931 static entity_t *get_expression_entity(const expression_t *expression)
2932 {
2933         if (expression->kind != EXPR_REFERENCE)
2934                 return NULL;
2935
2936         return expression->reference.entity;
2937 }
2938
2939 static unsigned get_cparser_entity_alignment(const entity_t *entity)
2940 {
2941         switch(entity->kind) {
2942         case DECLARATION_KIND_CASES:
2943                 return entity->declaration.alignment;
2944         case ENTITY_STRUCT:
2945         case ENTITY_UNION:
2946                 return entity->compound.alignment;
2947         case ENTITY_TYPEDEF:
2948                 return entity->typedefe.alignment;
2949         default:
2950                 break;
2951         }
2952         return 0;
2953 }
2954
2955 /**
2956  * Transform an alignof expression into Firm code.
2957  */
2958 static ir_node *alignof_to_firm(const typeprop_expression_t *expression)
2959 {
2960         unsigned alignment = 0;
2961
2962         const expression_t *tp_expression = expression->tp_expression;
2963         if (tp_expression != NULL) {
2964                 entity_t *entity = get_expression_entity(tp_expression);
2965                 if (entity != NULL) {
2966                         if (entity->kind == ENTITY_FUNCTION) {
2967                                 /* a gnu-extension */
2968                                 alignment = 1;
2969                         } else {
2970                                 alignment = get_cparser_entity_alignment(entity);
2971                         }
2972                 }
2973         }
2974
2975         if (alignment == 0) {
2976                 type_t *type = expression->type;
2977                 alignment = get_type_alignment(type);
2978         }
2979
2980         dbg_info  *dbgi = get_dbg_info(&expression->base.source_position);
2981         ir_mode   *mode = get_ir_mode_arithmetic(expression->base.type);
2982         ir_tarval *tv   = new_tarval_from_long(alignment, mode);
2983         return new_d_Const(dbgi, tv);
2984 }
2985
2986 static void init_ir_types(void);
2987
2988 static ir_tarval *fold_constant_to_tarval(const expression_t *expression)
2989 {
2990         assert(is_constant_expression(expression) == EXPR_CLASS_CONSTANT);
2991
2992         bool constant_folding_old = constant_folding;
2993         constant_folding = true;
2994         int old_optimize         = get_optimize();
2995         int old_constant_folding = get_opt_constant_folding();
2996         set_optimize(1);
2997         set_opt_constant_folding(1);
2998
2999         init_ir_types();
3000
3001         ir_graph *old_current_ir_graph = current_ir_graph;
3002         current_ir_graph = get_const_code_irg();
3003
3004         ir_node *cnst = expression_to_firm(expression);
3005         current_ir_graph = old_current_ir_graph;
3006         set_optimize(old_optimize);
3007         set_opt_constant_folding(old_constant_folding);
3008
3009         if (!is_Const(cnst)) {
3010                 panic("couldn't fold constant");
3011         }
3012
3013         constant_folding = constant_folding_old;
3014
3015         return get_Const_tarval(cnst);
3016 }
3017
3018 /* this function is only used in parser.c, but it relies on libfirm functionality */
3019 bool constant_is_negative(const expression_t *expression)
3020 {
3021         ir_tarval *tv = fold_constant_to_tarval(expression);
3022         return tarval_is_negative(tv);
3023 }
3024
3025 long fold_constant_to_int(const expression_t *expression)
3026 {
3027         ir_tarval *tv = fold_constant_to_tarval(expression);
3028         if (!tarval_is_long(tv)) {
3029                 panic("result of constant folding is not integer");
3030         }
3031
3032         return get_tarval_long(tv);
3033 }
3034
3035 bool fold_constant_to_bool(const expression_t *expression)
3036 {
3037         ir_tarval *tv = fold_constant_to_tarval(expression);
3038         return !tarval_is_null(tv);
3039 }
3040
3041 static ir_node *conditional_to_firm(const conditional_expression_t *expression)
3042 {
3043         dbg_info *const dbgi = get_dbg_info(&expression->base.source_position);
3044
3045         /* first try to fold a constant condition */
3046         if (is_constant_expression(expression->condition) == EXPR_CLASS_CONSTANT) {
3047                 bool val = fold_constant_to_bool(expression->condition);
3048                 if (val) {
3049                         expression_t *true_expression = expression->true_expression;
3050                         if (true_expression == NULL)
3051                                 true_expression = expression->condition;
3052                         return expression_to_firm(true_expression);
3053                 } else {
3054                         return expression_to_firm(expression->false_expression);
3055                 }
3056         }
3057
3058         ir_node *const true_block  = new_immBlock();
3059         ir_node *const false_block = new_immBlock();
3060         ir_node *const cond_expr   = create_condition_evaluation(expression->condition, true_block, false_block);
3061         mature_immBlock(true_block);
3062         mature_immBlock(false_block);
3063
3064         set_cur_block(true_block);
3065         ir_node *true_val;
3066         if (expression->true_expression != NULL) {
3067                 true_val = expression_to_firm(expression->true_expression);
3068         } else if (cond_expr != NULL && get_irn_mode(cond_expr) != mode_b) {
3069                 true_val = cond_expr;
3070         } else {
3071                 /* Condition ended with a short circuit (&&, ||, !) operation or a
3072                  * comparison.  Generate a "1" as value for the true branch. */
3073                 true_val = new_Const(get_mode_one(mode_Is));
3074         }
3075         ir_node *const true_jmp = new_d_Jmp(dbgi);
3076
3077         set_cur_block(false_block);
3078         ir_node *const false_val = expression_to_firm(expression->false_expression);
3079         ir_node *const false_jmp = new_d_Jmp(dbgi);
3080
3081         /* create the common block */
3082         ir_node *const in_cf[2] = { true_jmp, false_jmp };
3083         ir_node *const block    = new_Block(lengthof(in_cf), in_cf);
3084         set_cur_block(block);
3085
3086         /* TODO improve static semantics, so either both or no values are NULL */
3087         if (true_val == NULL || false_val == NULL)
3088                 return NULL;
3089
3090         ir_node *const in[2] = { true_val, false_val };
3091         type_t  *const type  = skip_typeref(expression->base.type);
3092         ir_mode *mode;
3093         if (is_type_compound(type)) {
3094                 mode = mode_P;
3095         } else {
3096                 mode = get_ir_mode_arithmetic(type);
3097         }
3098         ir_node *const val   = new_d_Phi(dbgi, lengthof(in), in, mode);
3099
3100         return val;
3101 }
3102
3103 /**
3104  * Returns an IR-node representing the address of a field.
3105  */
3106 static ir_node *select_addr(const select_expression_t *expression)
3107 {
3108         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3109
3110         construct_select_compound(expression);
3111
3112         ir_node *compound_addr = expression_to_firm(expression->compound);
3113
3114         entity_t *entry = expression->compound_entry;
3115         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3116         assert(entry->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
3117
3118         if (constant_folding) {
3119                 ir_mode *mode      = get_irn_mode(compound_addr);
3120                 ir_mode *mode_uint = get_reference_mode_unsigned_eq(mode);
3121                 ir_node *ofs       = new_Const_long(mode_uint, entry->compound_member.offset);
3122                 return new_d_Add(dbgi, compound_addr, ofs, mode);
3123         } else {
3124                 ir_entity *irentity = entry->compound_member.entity;
3125                 assert(irentity != NULL);
3126                 return new_d_simpleSel(dbgi, new_NoMem(), compound_addr, irentity);
3127         }
3128 }
3129
3130 static ir_node *select_to_firm(const select_expression_t *expression)
3131 {
3132         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3133         ir_node  *addr = select_addr(expression);
3134         type_t   *type = revert_automatic_type_conversion(
3135                         (const expression_t*) expression);
3136         type           = skip_typeref(type);
3137
3138         entity_t *entry = expression->compound_entry;
3139         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3140
3141         if (entry->compound_member.bitfield) {
3142                 return bitfield_extract_to_firm(expression, addr);
3143         }
3144
3145         return deref_address(dbgi, type, addr);
3146 }
3147
3148 /* Values returned by __builtin_classify_type. */
3149 typedef enum gcc_type_class
3150 {
3151         no_type_class = -1,
3152         void_type_class,
3153         integer_type_class,
3154         char_type_class,
3155         enumeral_type_class,
3156         boolean_type_class,
3157         pointer_type_class,
3158         reference_type_class,
3159         offset_type_class,
3160         real_type_class,
3161         complex_type_class,
3162         function_type_class,
3163         method_type_class,
3164         record_type_class,
3165         union_type_class,
3166         array_type_class,
3167         string_type_class,
3168         set_type_class,
3169         file_type_class,
3170         lang_type_class
3171 } gcc_type_class;
3172
3173 static ir_node *classify_type_to_firm(const classify_type_expression_t *const expr)
3174 {
3175         type_t *type = expr->type_expression->base.type;
3176
3177         /* FIXME gcc returns different values depending on whether compiling C or C++
3178          * e.g. int x[10] is pointer_type_class in C, but array_type_class in C++ */
3179         gcc_type_class tc;
3180         for (;;) {
3181                 type = skip_typeref(type);
3182                 switch (type->kind) {
3183                         case TYPE_ATOMIC: {
3184                                 const atomic_type_t *const atomic_type = &type->atomic;
3185                                 switch (atomic_type->akind) {
3186                                         /* should not be reached */
3187                                         case ATOMIC_TYPE_INVALID:
3188                                                 tc = no_type_class;
3189                                                 goto make_const;
3190
3191                                         /* gcc cannot do that */
3192                                         case ATOMIC_TYPE_VOID:
3193                                                 tc = void_type_class;
3194                                                 goto make_const;
3195
3196                                         case ATOMIC_TYPE_WCHAR_T:   /* gcc handles this as integer */
3197                                         case ATOMIC_TYPE_CHAR:      /* gcc handles this as integer */
3198                                         case ATOMIC_TYPE_SCHAR:     /* gcc handles this as integer */
3199                                         case ATOMIC_TYPE_UCHAR:     /* gcc handles this as integer */
3200                                         case ATOMIC_TYPE_SHORT:
3201                                         case ATOMIC_TYPE_USHORT:
3202                                         case ATOMIC_TYPE_INT:
3203                                         case ATOMIC_TYPE_UINT:
3204                                         case ATOMIC_TYPE_LONG:
3205                                         case ATOMIC_TYPE_ULONG:
3206                                         case ATOMIC_TYPE_LONGLONG:
3207                                         case ATOMIC_TYPE_ULONGLONG:
3208                                         case ATOMIC_TYPE_BOOL:      /* gcc handles this as integer */
3209                                                 tc = integer_type_class;
3210                                                 goto make_const;
3211
3212                                         case ATOMIC_TYPE_FLOAT:
3213                                         case ATOMIC_TYPE_DOUBLE:
3214                                         case ATOMIC_TYPE_LONG_DOUBLE:
3215                                                 tc = real_type_class;
3216                                                 goto make_const;
3217                                 }
3218                                 panic("Unexpected atomic type in classify_type_to_firm().");
3219                         }
3220
3221                         case TYPE_COMPLEX:         tc = complex_type_class; goto make_const;
3222                         case TYPE_IMAGINARY:       tc = complex_type_class; goto make_const;
3223                         case TYPE_ARRAY:           /* gcc handles this as pointer */
3224                         case TYPE_FUNCTION:        /* gcc handles this as pointer */
3225                         case TYPE_POINTER:         tc = pointer_type_class; goto make_const;
3226                         case TYPE_COMPOUND_STRUCT: tc = record_type_class;  goto make_const;
3227                         case TYPE_COMPOUND_UNION:  tc = union_type_class;   goto make_const;
3228
3229                         /* gcc handles this as integer */
3230                         case TYPE_ENUM:            tc = integer_type_class; goto make_const;
3231
3232                         /* gcc classifies the referenced type */
3233                         case TYPE_REFERENCE: type = type->reference.refers_to; continue;
3234
3235                         /* typedef/typeof should be skipped already */
3236                         case TYPE_TYPEDEF:
3237                         case TYPE_TYPEOF:
3238                         case TYPE_ERROR:
3239                                 break;
3240                 }
3241                 panic("unexpected TYPE classify_type_to_firm().");
3242         }
3243
3244 make_const:;
3245         dbg_info  *const dbgi = get_dbg_info(&expr->base.source_position);
3246         ir_mode   *const mode = atomic_modes[ATOMIC_TYPE_INT];
3247         ir_tarval *const tv   = new_tarval_from_long(tc, mode);
3248         return new_d_Const(dbgi, tv);
3249 }
3250
3251 static ir_node *function_name_to_firm(
3252                 const funcname_expression_t *const expr)
3253 {
3254         switch(expr->kind) {
3255         case FUNCNAME_FUNCTION:
3256         case FUNCNAME_PRETTY_FUNCTION:
3257         case FUNCNAME_FUNCDNAME:
3258                 if (current_function_name == NULL) {
3259                         const source_position_t *const src_pos = &expr->base.source_position;
3260                         const char    *name  = current_function_entity->base.symbol->string;
3261                         const string_t string = { name, strlen(name) + 1 };
3262                         current_function_name = string_to_firm(src_pos, "__func__.%u", &string);
3263                 }
3264                 return current_function_name;
3265         case FUNCNAME_FUNCSIG:
3266                 if (current_funcsig == NULL) {
3267                         const source_position_t *const src_pos = &expr->base.source_position;
3268                         ir_entity *ent = get_irg_entity(current_ir_graph);
3269                         const char *const name = get_entity_ld_name(ent);
3270                         const string_t string = { name, strlen(name) + 1 };
3271                         current_funcsig = string_to_firm(src_pos, "__FUNCSIG__.%u", &string);
3272                 }
3273                 return current_funcsig;
3274         }
3275         panic("Unsupported function name");
3276 }
3277
3278 static ir_node *statement_expression_to_firm(const statement_expression_t *expr)
3279 {
3280         statement_t *statement = expr->statement;
3281
3282         assert(statement->kind == STATEMENT_COMPOUND);
3283         return compound_statement_to_firm(&statement->compound);
3284 }
3285
3286 static ir_node *va_start_expression_to_firm(
3287         const va_start_expression_t *const expr)
3288 {
3289         ir_entity *param_ent = current_vararg_entity;
3290         if (param_ent == NULL) {
3291                 size_t   const n           = IR_VA_START_PARAMETER_NUMBER;
3292                 ir_type *const frame_type  = get_irg_frame_type(current_ir_graph);
3293                 ir_type *const param_type  = get_unknown_type();
3294                 param_ent = new_parameter_entity(frame_type, n, param_type);
3295                 current_vararg_entity = param_ent;
3296         }
3297
3298         ir_node  *const frame   = get_irg_frame(current_ir_graph);
3299         dbg_info *const dbgi    = get_dbg_info(&expr->base.source_position);
3300         ir_node  *const no_mem  = new_NoMem();
3301         ir_node  *const arg_sel = new_d_simpleSel(dbgi, no_mem, frame, param_ent);
3302
3303         set_value_for_expression(expr->ap, arg_sel);
3304
3305         return NULL;
3306 }
3307
3308 static ir_node *va_arg_expression_to_firm(const va_arg_expression_t *const expr)
3309 {
3310         type_t       *const type    = expr->base.type;
3311         expression_t *const ap_expr = expr->ap;
3312         ir_node      *const ap_addr = expression_to_addr(ap_expr);
3313         ir_node      *const ap      = get_value_from_lvalue(ap_expr, ap_addr);
3314         dbg_info     *const dbgi    = get_dbg_info(&expr->base.source_position);
3315         ir_node      *const res     = deref_address(dbgi, type, ap);
3316
3317         ir_node      *const cnst    = get_type_size_node(expr->base.type);
3318         ir_mode      *const mode    = get_irn_mode(cnst);
3319         ir_node      *const c1      = new_Const_long(mode, stack_param_align - 1);
3320         ir_node      *const c2      = new_d_Add(dbgi, cnst, c1, mode);
3321         ir_node      *const c3      = new_Const_long(mode, -(long)stack_param_align);
3322         ir_node      *const c4      = new_d_And(dbgi, c2, c3, mode);
3323         ir_node      *const add     = new_d_Add(dbgi, ap, c4, mode_P_data);
3324
3325         set_value_for_expression_addr(ap_expr, add, ap_addr);
3326
3327         return res;
3328 }
3329
3330 /**
3331  * Generate Firm for a va_copy expression.
3332  */
3333 static ir_node *va_copy_expression_to_firm(const va_copy_expression_t *const expr)
3334 {
3335         ir_node *const src = expression_to_firm(expr->src);
3336         set_value_for_expression(expr->dst, src);
3337         return NULL;
3338 }
3339
3340 static ir_node *dereference_addr(const unary_expression_t *const expression)
3341 {
3342         assert(expression->base.kind == EXPR_UNARY_DEREFERENCE);
3343         return expression_to_firm(expression->value);
3344 }
3345
3346 /**
3347  * Returns a IR-node representing an lvalue of the given expression.
3348  */
3349 static ir_node *expression_to_addr(const expression_t *expression)
3350 {
3351         switch(expression->kind) {
3352         case EXPR_ARRAY_ACCESS:
3353                 return array_access_addr(&expression->array_access);
3354         case EXPR_CALL:
3355                 return call_expression_to_firm(&expression->call);
3356         case EXPR_COMPOUND_LITERAL:
3357                 return compound_literal_addr(&expression->compound_literal);
3358         case EXPR_REFERENCE:
3359                 return reference_addr(&expression->reference);
3360         case EXPR_SELECT:
3361                 return select_addr(&expression->select);
3362         case EXPR_UNARY_DEREFERENCE:
3363                 return dereference_addr(&expression->unary);
3364         default:
3365                 break;
3366         }
3367         panic("trying to get address of non-lvalue");
3368 }
3369
3370 static ir_node *builtin_constant_to_firm(
3371                 const builtin_constant_expression_t *expression)
3372 {
3373         ir_mode *const mode = get_ir_mode_arithmetic(expression->base.type);
3374         bool     const v    = is_constant_expression(expression->value) == EXPR_CLASS_CONSTANT;
3375         return create_Const_from_bool(mode, v);
3376 }
3377
3378 static ir_node *builtin_types_compatible_to_firm(
3379                 const builtin_types_compatible_expression_t *expression)
3380 {
3381         type_t  *const left  = get_unqualified_type(skip_typeref(expression->left));
3382         type_t  *const right = get_unqualified_type(skip_typeref(expression->right));
3383         bool     const value = types_compatible(left, right);
3384         ir_mode *const mode  = get_ir_mode_arithmetic(expression->base.type);
3385         return create_Const_from_bool(mode, value);
3386 }
3387
3388 static ir_node *get_label_block(label_t *label)
3389 {
3390         if (label->block != NULL)
3391                 return label->block;
3392
3393         /* beware: might be called from create initializer with current_ir_graph
3394          * set to const_code_irg. */
3395         ir_graph *rem    = current_ir_graph;
3396         current_ir_graph = current_function;
3397
3398         ir_node *block = new_immBlock();
3399
3400         label->block = block;
3401
3402         ARR_APP1(label_t *, all_labels, label);
3403
3404         current_ir_graph = rem;
3405         return block;
3406 }
3407
3408 /**
3409  * Pointer to a label.  This is used for the
3410  * GNU address-of-label extension.
3411  */
3412 static ir_node *label_address_to_firm(const label_address_expression_t *label)
3413 {
3414         dbg_info  *dbgi   = get_dbg_info(&label->base.source_position);
3415         ir_node   *block  = get_label_block(label->label);
3416         ir_entity *entity = create_Block_entity(block);
3417
3418         symconst_symbol value;
3419         value.entity_p = entity;
3420         return new_d_SymConst(dbgi, mode_P_code, value, symconst_addr_ent);
3421 }
3422
3423 /**
3424  * creates firm nodes for an expression. The difference between this function
3425  * and expression_to_firm is, that this version might produce mode_b nodes
3426  * instead of mode_Is.
3427  */
3428 static ir_node *_expression_to_firm(expression_t const *const expr)
3429 {
3430 #ifndef NDEBUG
3431         if (!constant_folding) {
3432                 assert(!expr->base.transformed);
3433                 ((expression_t*)expr)->base.transformed = true;
3434         }
3435 #endif
3436
3437         switch (expr->kind) {
3438         case EXPR_ALIGNOF:                    return alignof_to_firm(                 &expr->typeprop);
3439         case EXPR_ARRAY_ACCESS:               return array_access_to_firm(            &expr->array_access);
3440         case EXPR_BINARY_CASES:               return binary_expression_to_firm(       &expr->binary);
3441         case EXPR_BUILTIN_CONSTANT_P:         return builtin_constant_to_firm(        &expr->builtin_constant);
3442         case EXPR_BUILTIN_TYPES_COMPATIBLE_P: return builtin_types_compatible_to_firm(&expr->builtin_types_compatible);
3443         case EXPR_CALL:                       return call_expression_to_firm(         &expr->call);
3444         case EXPR_CLASSIFY_TYPE:              return classify_type_to_firm(           &expr->classify_type);
3445         case EXPR_COMPOUND_LITERAL:           return compound_literal_to_firm(        &expr->compound_literal);
3446         case EXPR_CONDITIONAL:                return conditional_to_firm(             &expr->conditional);
3447         case EXPR_FUNCNAME:                   return function_name_to_firm(           &expr->funcname);
3448         case EXPR_LABEL_ADDRESS:              return label_address_to_firm(           &expr->label_address);
3449         case EXPR_LITERAL_CASES:              return literal_to_firm(                 &expr->literal);
3450         case EXPR_OFFSETOF:                   return offsetof_to_firm(                &expr->offsetofe);
3451         case EXPR_REFERENCE:                  return reference_expression_to_firm(    &expr->reference);
3452         case EXPR_ENUM_CONSTANT:              return enum_constant_to_firm(           &expr->reference);
3453         case EXPR_SELECT:                     return select_to_firm(                  &expr->select);
3454         case EXPR_SIZEOF:                     return sizeof_to_firm(                  &expr->typeprop);
3455         case EXPR_STATEMENT:                  return statement_expression_to_firm(    &expr->statement);
3456         case EXPR_UNARY_CASES:                return unary_expression_to_firm(        &expr->unary);
3457         case EXPR_VA_ARG:                     return va_arg_expression_to_firm(       &expr->va_arge);
3458         case EXPR_VA_COPY:                    return va_copy_expression_to_firm(      &expr->va_copye);
3459         case EXPR_VA_START:                   return va_start_expression_to_firm(     &expr->va_starte);
3460         case EXPR_WIDE_STRING_LITERAL:        return wide_string_literal_to_firm(     &expr->string_literal);
3461
3462         case EXPR_STRING_LITERAL: return string_to_firm(&expr->base.source_position, "str.%u", &expr->literal.value);
3463
3464         case EXPR_ERROR: break;
3465         }
3466         panic("invalid expression found");
3467 }
3468
3469 /**
3470  * Check if a given expression is a GNU __builtin_expect() call.
3471  */
3472 static bool is_builtin_expect(const expression_t *expression)
3473 {
3474         if (expression->kind != EXPR_CALL)
3475                 return false;
3476
3477         expression_t *function = expression->call.function;
3478         if (function->kind != EXPR_REFERENCE)
3479                 return false;
3480         reference_expression_t *ref = &function->reference;
3481         if (ref->entity->kind         != ENTITY_FUNCTION ||
3482             ref->entity->function.btk != BUILTIN_EXPECT)
3483                 return false;
3484
3485         return true;
3486 }
3487
3488 static bool produces_mode_b(const expression_t *expression)
3489 {
3490         switch (expression->kind) {
3491         case EXPR_BINARY_EQUAL:
3492         case EXPR_BINARY_NOTEQUAL:
3493         case EXPR_BINARY_LESS:
3494         case EXPR_BINARY_LESSEQUAL:
3495         case EXPR_BINARY_GREATER:
3496         case EXPR_BINARY_GREATEREQUAL:
3497         case EXPR_BINARY_ISGREATER:
3498         case EXPR_BINARY_ISGREATEREQUAL:
3499         case EXPR_BINARY_ISLESS:
3500         case EXPR_BINARY_ISLESSEQUAL:
3501         case EXPR_BINARY_ISLESSGREATER:
3502         case EXPR_BINARY_ISUNORDERED:
3503         case EXPR_UNARY_NOT:
3504                 return true;
3505
3506         case EXPR_CALL:
3507                 if (is_builtin_expect(expression)) {
3508                         expression_t *argument = expression->call.arguments->expression;
3509                         return produces_mode_b(argument);
3510                 }
3511                 return false;
3512         case EXPR_BINARY_COMMA:
3513                 return produces_mode_b(expression->binary.right);
3514
3515         default:
3516                 return false;
3517         }
3518 }
3519
3520 static ir_node *expression_to_firm(const expression_t *expression)
3521 {
3522         if (!produces_mode_b(expression)) {
3523                 ir_node *res = _expression_to_firm(expression);
3524                 assert(res == NULL || get_irn_mode(res) != mode_b);
3525                 return res;
3526         }
3527
3528         if (is_constant_expression(expression) == EXPR_CLASS_CONSTANT) {
3529                 bool const constant_folding_old = constant_folding;
3530                 constant_folding = true;
3531                 ir_node *res  = _expression_to_firm(expression);
3532                 constant_folding = constant_folding_old;
3533                 ir_mode *mode = get_ir_mode_arithmetic(expression->base.type);
3534                 assert(is_Const(res));
3535                 return create_Const_from_bool(mode, !is_Const_null(res));
3536         }
3537
3538         /* we have to produce a 0/1 from the mode_b expression */
3539         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3540         ir_mode  *mode = get_ir_mode_arithmetic(expression->base.type);
3541         return produce_condition_result(expression, mode, dbgi);
3542 }
3543
3544 /**
3545  * create a short-circuit expression evaluation that tries to construct
3546  * efficient control flow structures for &&, || and ! expressions
3547  */
3548 static ir_node *create_condition_evaluation(const expression_t *expression,
3549                                             ir_node *true_block,
3550                                             ir_node *false_block)
3551 {
3552         switch(expression->kind) {
3553         case EXPR_UNARY_NOT: {
3554                 const unary_expression_t *unary_expression = &expression->unary;
3555                 create_condition_evaluation(unary_expression->value, false_block,
3556                                             true_block);
3557                 return NULL;
3558         }
3559         case EXPR_BINARY_LOGICAL_AND: {
3560                 const binary_expression_t *binary_expression = &expression->binary;
3561
3562                 ir_node *extra_block = new_immBlock();
3563                 create_condition_evaluation(binary_expression->left, extra_block,
3564                                             false_block);
3565                 mature_immBlock(extra_block);
3566                 set_cur_block(extra_block);
3567                 create_condition_evaluation(binary_expression->right, true_block,
3568                                             false_block);
3569                 return NULL;
3570         }
3571         case EXPR_BINARY_LOGICAL_OR: {
3572                 const binary_expression_t *binary_expression = &expression->binary;
3573
3574                 ir_node *extra_block = new_immBlock();
3575                 create_condition_evaluation(binary_expression->left, true_block,
3576                                             extra_block);
3577                 mature_immBlock(extra_block);
3578                 set_cur_block(extra_block);
3579                 create_condition_evaluation(binary_expression->right, true_block,
3580                                             false_block);
3581                 return NULL;
3582         }
3583         default:
3584                 break;
3585         }
3586
3587         dbg_info *dbgi       = get_dbg_info(&expression->base.source_position);
3588         ir_node  *cond_expr  = _expression_to_firm(expression);
3589         ir_node  *condition  = create_conv(dbgi, cond_expr, mode_b);
3590         ir_node  *cond       = new_d_Cond(dbgi, condition);
3591         ir_node  *true_proj  = new_d_Proj(dbgi, cond, mode_X, pn_Cond_true);
3592         ir_node  *false_proj = new_d_Proj(dbgi, cond, mode_X, pn_Cond_false);
3593
3594         /* set branch prediction info based on __builtin_expect */
3595         if (is_builtin_expect(expression) && is_Cond(cond)) {
3596                 call_argument_t *argument = expression->call.arguments->next;
3597                 if (is_constant_expression(argument->expression) == EXPR_CLASS_CONSTANT) {
3598                         bool               const cnst = fold_constant_to_bool(argument->expression);
3599                         cond_jmp_predicate const pred = cnst ? COND_JMP_PRED_TRUE : COND_JMP_PRED_FALSE;
3600                         set_Cond_jmp_pred(cond, pred);
3601                 }
3602         }
3603
3604         add_immBlock_pred(true_block, true_proj);
3605         add_immBlock_pred(false_block, false_proj);
3606
3607         set_unreachable_now();
3608         return cond_expr;
3609 }
3610
3611 static void create_variable_entity(entity_t *variable,
3612                                    declaration_kind_t declaration_kind,
3613                                    ir_type *parent_type)
3614 {
3615         assert(variable->kind == ENTITY_VARIABLE);
3616         type_t    *type = skip_typeref(variable->declaration.type);
3617
3618         ident     *const id        = new_id_from_str(variable->base.symbol->string);
3619         ir_type   *const irtype    = get_ir_type(type);
3620         dbg_info  *const dbgi      = get_dbg_info(&variable->base.source_position);
3621         ir_entity *const irentity  = new_d_entity(parent_type, id, irtype, dbgi);
3622         unsigned         alignment = variable->declaration.alignment;
3623
3624         set_entity_alignment(irentity, alignment);
3625
3626         handle_decl_modifiers(irentity, variable);
3627
3628         variable->declaration.kind  = (unsigned char) declaration_kind;
3629         variable->variable.v.entity = irentity;
3630         set_entity_ld_ident(irentity, create_ld_ident(variable));
3631
3632         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
3633                 set_entity_volatility(irentity, volatility_is_volatile);
3634         }
3635 }
3636
3637
3638 typedef struct type_path_entry_t type_path_entry_t;
3639 struct type_path_entry_t {
3640         type_t           *type;
3641         ir_initializer_t *initializer;
3642         size_t            index;
3643         entity_t         *compound_entry;
3644 };
3645
3646 typedef struct type_path_t type_path_t;
3647 struct type_path_t {
3648         type_path_entry_t *path;
3649         type_t            *top_type;
3650         bool               invalid;
3651 };
3652
3653 static __attribute__((unused)) void debug_print_type_path(const type_path_t *path)
3654 {
3655         size_t len = ARR_LEN(path->path);
3656
3657         for (size_t i = 0; i < len; ++i) {
3658                 const type_path_entry_t *entry = & path->path[i];
3659
3660                 type_t *type = skip_typeref(entry->type);
3661                 if (is_type_compound(type)) {
3662                         fprintf(stderr, ".%s", entry->compound_entry->base.symbol->string);
3663                 } else if (is_type_array(type)) {
3664                         fprintf(stderr, "[%u]", (unsigned) entry->index);
3665                 } else {
3666                         fprintf(stderr, "-INVALID-");
3667                 }
3668         }
3669         fprintf(stderr, "  (");
3670         print_type(path->top_type);
3671         fprintf(stderr, ")");
3672 }
3673
3674 static type_path_entry_t *get_type_path_top(const type_path_t *path)
3675 {
3676         size_t len = ARR_LEN(path->path);
3677         assert(len > 0);
3678         return & path->path[len-1];
3679 }
3680
3681 static type_path_entry_t *append_to_type_path(type_path_t *path)
3682 {
3683         size_t len = ARR_LEN(path->path);
3684         ARR_RESIZE(type_path_entry_t, path->path, len+1);
3685
3686         type_path_entry_t *result = & path->path[len];
3687         memset(result, 0, sizeof(result[0]));
3688         return result;
3689 }
3690
3691 static size_t get_compound_member_count(const compound_type_t *type)
3692 {
3693         compound_t *compound  = type->compound;
3694         size_t      n_members = 0;
3695         entity_t   *member    = compound->members.entities;
3696         for ( ; member != NULL; member = member->base.next) {
3697                 ++n_members;
3698         }
3699
3700         return n_members;
3701 }
3702
3703 static ir_initializer_t *get_initializer_entry(type_path_t *path)
3704 {
3705         type_t *orig_top_type = path->top_type;
3706         type_t *top_type      = skip_typeref(orig_top_type);
3707
3708         assert(is_type_compound(top_type) || is_type_array(top_type));
3709
3710         if (ARR_LEN(path->path) == 0) {
3711                 return NULL;
3712         } else {
3713                 type_path_entry_t *top         = get_type_path_top(path);
3714                 ir_initializer_t  *initializer = top->initializer;
3715                 return get_initializer_compound_value(initializer, top->index);
3716         }
3717 }
3718
3719 static void descend_into_subtype(type_path_t *path)
3720 {
3721         type_t *orig_top_type = path->top_type;
3722         type_t *top_type      = skip_typeref(orig_top_type);
3723
3724         assert(is_type_compound(top_type) || is_type_array(top_type));
3725
3726         ir_initializer_t *initializer = get_initializer_entry(path);
3727
3728         type_path_entry_t *top = append_to_type_path(path);
3729         top->type              = top_type;
3730
3731         size_t len;
3732
3733         if (is_type_compound(top_type)) {
3734                 compound_t *const compound = top_type->compound.compound;
3735                 entity_t   *const entry    = skip_unnamed_bitfields(compound->members.entities);
3736
3737                 top->compound_entry = entry;
3738                 top->index          = 0;
3739                 len                 = get_compound_member_count(&top_type->compound);
3740                 if (entry != NULL) {
3741                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3742                         path->top_type = entry->declaration.type;
3743                 }
3744         } else {
3745                 assert(is_type_array(top_type));
3746                 assert(top_type->array.size > 0);
3747
3748                 top->index     = 0;
3749                 path->top_type = top_type->array.element_type;
3750                 len            = top_type->array.size;
3751         }
3752         if (initializer == NULL
3753                         || get_initializer_kind(initializer) == IR_INITIALIZER_NULL) {
3754                 initializer = create_initializer_compound(len);
3755                 /* we have to set the entry at the 2nd latest path entry... */
3756                 size_t path_len = ARR_LEN(path->path);
3757                 assert(path_len >= 1);
3758                 if (path_len > 1) {
3759                         type_path_entry_t *entry        = & path->path[path_len-2];
3760                         ir_initializer_t  *tinitializer = entry->initializer;
3761                         set_initializer_compound_value(tinitializer, entry->index,
3762                                                        initializer);
3763                 }
3764         }
3765         top->initializer = initializer;
3766 }
3767
3768 static void ascend_from_subtype(type_path_t *path)
3769 {
3770         type_path_entry_t *top = get_type_path_top(path);
3771
3772         path->top_type = top->type;
3773
3774         size_t len = ARR_LEN(path->path);
3775         ARR_RESIZE(type_path_entry_t, path->path, len-1);
3776 }
3777
3778 static void walk_designator(type_path_t *path, const designator_t *designator)
3779 {
3780         /* designators start at current object type */
3781         ARR_RESIZE(type_path_entry_t, path->path, 1);
3782
3783         for ( ; designator != NULL; designator = designator->next) {
3784                 type_path_entry_t *top         = get_type_path_top(path);
3785                 type_t            *orig_type   = top->type;
3786                 type_t            *type        = skip_typeref(orig_type);
3787
3788                 if (designator->symbol != NULL) {
3789                         assert(is_type_compound(type));
3790                         size_t    index  = 0;
3791                         symbol_t *symbol = designator->symbol;
3792
3793                         compound_t *compound = type->compound.compound;
3794                         entity_t   *iter     = compound->members.entities;
3795                         for ( ; iter != NULL; iter = iter->base.next, ++index) {
3796                                 if (iter->base.symbol == symbol) {
3797                                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
3798                                         break;
3799                                 }
3800                         }
3801                         assert(iter != NULL);
3802
3803                         /* revert previous initialisations of other union elements */
3804                         if (type->kind == TYPE_COMPOUND_UNION) {
3805                                 ir_initializer_t *initializer = top->initializer;
3806                                 if (initializer != NULL
3807                                         && get_initializer_kind(initializer) == IR_INITIALIZER_COMPOUND) {
3808                                         /* are we writing to a new element? */
3809                                         ir_initializer_t *oldi
3810                                                 = get_initializer_compound_value(initializer, index);
3811                                         if (get_initializer_kind(oldi) == IR_INITIALIZER_NULL) {
3812                                                 /* clear initializer */
3813                                                 size_t len
3814                                                         = get_initializer_compound_n_entries(initializer);
3815                                                 ir_initializer_t *nulli = get_initializer_null();
3816                                                 for (size_t i = 0; i < len; ++i) {
3817                                                         set_initializer_compound_value(initializer, i,
3818                                                                                        nulli);
3819                                                 }
3820                                         }
3821                                 }
3822                         }
3823
3824                         top->type           = orig_type;
3825                         top->compound_entry = iter;
3826                         top->index          = index;
3827                         orig_type           = iter->declaration.type;
3828                 } else {
3829                         expression_t *array_index = designator->array_index;
3830                         assert(designator->array_index != NULL);
3831                         assert(is_type_array(type));
3832
3833                         long index = fold_constant_to_int(array_index);
3834                         assert(index >= 0);
3835 #ifndef NDEBUG
3836                         if (type->array.size_constant) {
3837                                 long array_size = type->array.size;
3838                                 assert(index < array_size);
3839                         }
3840 #endif
3841
3842                         top->type  = orig_type;
3843                         top->index = (size_t) index;
3844                         orig_type  = type->array.element_type;
3845                 }
3846                 path->top_type = orig_type;
3847
3848                 if (designator->next != NULL) {
3849                         descend_into_subtype(path);
3850                 }
3851         }
3852
3853         path->invalid  = false;
3854 }
3855
3856 static void advance_current_object(type_path_t *path)
3857 {
3858         if (path->invalid) {
3859                 /* TODO: handle this... */
3860                 panic("invalid initializer in ast2firm (excessive elements)");
3861         }
3862
3863         type_path_entry_t *top = get_type_path_top(path);
3864
3865         type_t *type = skip_typeref(top->type);
3866         if (is_type_union(type)) {
3867                 /* only the first element is initialized in unions */
3868                 top->compound_entry = NULL;
3869         } else if (is_type_struct(type)) {
3870                 entity_t *entry = top->compound_entry;
3871
3872                 top->index++;
3873                 entry               = skip_unnamed_bitfields(entry->base.next);
3874                 top->compound_entry = entry;
3875                 if (entry != NULL) {
3876                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3877                         path->top_type = entry->declaration.type;
3878                         return;
3879                 }
3880         } else {
3881                 assert(is_type_array(type));
3882
3883                 top->index++;
3884                 if (!type->array.size_constant || top->index < type->array.size) {
3885                         return;
3886                 }
3887         }
3888
3889         /* we're past the last member of the current sub-aggregate, try if we
3890          * can ascend in the type hierarchy and continue with another subobject */
3891         size_t len = ARR_LEN(path->path);
3892
3893         if (len > 1) {
3894                 ascend_from_subtype(path);
3895                 advance_current_object(path);
3896         } else {
3897                 path->invalid = true;
3898         }
3899 }
3900
3901
3902 static ir_initializer_t *create_ir_initializer_value(
3903                 const initializer_value_t *initializer)
3904 {
3905         if (is_type_compound(initializer->value->base.type)) {
3906                 panic("initializer creation for compounds not implemented yet");
3907         }
3908         type_t       *type = initializer->value->base.type;
3909         expression_t *expr = initializer->value;
3910         ir_node *value = expression_to_firm(expr);
3911         ir_mode *mode  = get_ir_mode_storage(type);
3912         value          = create_conv(NULL, value, mode);
3913         return create_initializer_const(value);
3914 }
3915
3916 /** test wether type can be initialized by a string constant */
3917 static bool is_string_type(type_t *type)
3918 {
3919         type_t *inner;
3920         if (is_type_pointer(type)) {
3921                 inner = skip_typeref(type->pointer.points_to);
3922         } else if(is_type_array(type)) {
3923                 inner = skip_typeref(type->array.element_type);
3924         } else {
3925                 return false;
3926         }
3927
3928         return is_type_integer(inner);
3929 }
3930
3931 static ir_initializer_t *create_ir_initializer_list(
3932                 const initializer_list_t *initializer, type_t *type)
3933 {
3934         type_path_t path;
3935         memset(&path, 0, sizeof(path));
3936         path.top_type = type;
3937         path.path     = NEW_ARR_F(type_path_entry_t, 0);
3938
3939         descend_into_subtype(&path);
3940
3941         for (size_t i = 0; i < initializer->len; ++i) {
3942                 const initializer_t *sub_initializer = initializer->initializers[i];
3943
3944                 if (sub_initializer->kind == INITIALIZER_DESIGNATOR) {
3945                         walk_designator(&path, sub_initializer->designator.designator);
3946                         continue;
3947                 }
3948
3949                 if (sub_initializer->kind == INITIALIZER_VALUE) {
3950                         /* we might have to descend into types until we're at a scalar
3951                          * type */
3952                         while(true) {
3953                                 type_t *orig_top_type = path.top_type;
3954                                 type_t *top_type      = skip_typeref(orig_top_type);
3955
3956                                 if (is_type_scalar(top_type))
3957                                         break;
3958                                 descend_into_subtype(&path);
3959                         }
3960                 } else if (sub_initializer->kind == INITIALIZER_STRING
3961                                 || sub_initializer->kind == INITIALIZER_WIDE_STRING) {
3962                         /* we might have to descend into types until we're at a scalar
3963                          * type */
3964                         while (true) {
3965                                 type_t *orig_top_type = path.top_type;
3966                                 type_t *top_type      = skip_typeref(orig_top_type);
3967
3968                                 if (is_string_type(top_type))
3969                                         break;
3970                                 descend_into_subtype(&path);
3971                         }
3972                 }
3973
3974                 ir_initializer_t *sub_irinitializer
3975                         = create_ir_initializer(sub_initializer, path.top_type);
3976
3977                 size_t path_len = ARR_LEN(path.path);
3978                 assert(path_len >= 1);
3979                 type_path_entry_t *entry        = & path.path[path_len-1];
3980                 ir_initializer_t  *tinitializer = entry->initializer;
3981                 set_initializer_compound_value(tinitializer, entry->index,
3982                                                sub_irinitializer);
3983
3984                 advance_current_object(&path);
3985         }
3986
3987         assert(ARR_LEN(path.path) >= 1);
3988         ir_initializer_t *result = path.path[0].initializer;
3989         DEL_ARR_F(path.path);
3990
3991         return result;
3992 }
3993
3994 static ir_initializer_t *create_ir_initializer_string(
3995                 const initializer_string_t *initializer, type_t *type)
3996 {
3997         type = skip_typeref(type);
3998
3999         size_t            string_len    = initializer->string.size;
4000         assert(type->kind == TYPE_ARRAY);
4001         assert(type->array.size_constant);
4002         size_t            len           = type->array.size;
4003         ir_initializer_t *irinitializer = create_initializer_compound(len);
4004
4005         const char *string = initializer->string.begin;
4006         ir_mode    *mode   = get_ir_mode_storage(type->array.element_type);
4007
4008         for (size_t i = 0; i < len; ++i) {
4009                 char c = 0;
4010                 if (i < string_len)
4011                         c = string[i];
4012
4013                 ir_tarval        *tv = new_tarval_from_long(c, mode);
4014                 ir_initializer_t *char_initializer = create_initializer_tarval(tv);
4015
4016                 set_initializer_compound_value(irinitializer, i, char_initializer);
4017         }
4018
4019         return irinitializer;
4020 }
4021
4022 static ir_initializer_t *create_ir_initializer_wide_string(
4023                 const initializer_wide_string_t *initializer, type_t *type)
4024 {
4025         assert(type->kind == TYPE_ARRAY);
4026         assert(type->array.size_constant);
4027         size_t            len           = type->array.size;
4028         size_t            string_len    = wstrlen(&initializer->string);
4029         ir_initializer_t *irinitializer = create_initializer_compound(len);
4030
4031         const char *p    = initializer->string.begin;
4032         ir_mode    *mode = get_type_mode(ir_type_wchar_t);
4033
4034         for (size_t i = 0; i < len; ++i) {
4035                 utf32 c = 0;
4036                 if (i < string_len) {
4037                         c = read_utf8_char(&p);
4038                 }
4039                 ir_tarval *tv = new_tarval_from_long(c, mode);
4040                 ir_initializer_t *char_initializer = create_initializer_tarval(tv);
4041
4042                 set_initializer_compound_value(irinitializer, i, char_initializer);
4043         }
4044
4045         return irinitializer;
4046 }
4047
4048 static ir_initializer_t *create_ir_initializer(
4049                 const initializer_t *initializer, type_t *type)
4050 {
4051         switch(initializer->kind) {
4052                 case INITIALIZER_STRING:
4053                         return create_ir_initializer_string(&initializer->string, type);
4054
4055                 case INITIALIZER_WIDE_STRING:
4056                         return create_ir_initializer_wide_string(&initializer->wide_string,
4057                                                                  type);
4058
4059                 case INITIALIZER_LIST:
4060                         return create_ir_initializer_list(&initializer->list, type);
4061
4062                 case INITIALIZER_VALUE:
4063                         return create_ir_initializer_value(&initializer->value);
4064
4065                 case INITIALIZER_DESIGNATOR:
4066                         panic("unexpected designator initializer found");
4067         }
4068         panic("unknown initializer");
4069 }
4070
4071 /** ANSI C §6.7.8:21: If there are fewer initializers [..] than there
4072  *  are elements [...] the remainder of the aggregate shall be initialized
4073  *  implicitly the same as objects that have static storage duration. */
4074 static void create_dynamic_null_initializer(ir_entity *entity, dbg_info *dbgi,
4075                 ir_node *base_addr)
4076 {
4077         /* for unions we must NOT do anything for null initializers */
4078         ir_type *owner = get_entity_owner(entity);
4079         if (is_Union_type(owner)) {
4080                 return;
4081         }
4082
4083         ir_type *ent_type = get_entity_type(entity);
4084         /* create sub-initializers for a compound type */
4085         if (is_compound_type(ent_type)) {
4086                 unsigned n_members = get_compound_n_members(ent_type);
4087                 for (unsigned n = 0; n < n_members; ++n) {
4088                         ir_entity *member = get_compound_member(ent_type, n);
4089                         ir_node   *addr   = new_d_simpleSel(dbgi, new_NoMem(), base_addr,
4090                                                                 member);
4091                         create_dynamic_null_initializer(member, dbgi, addr);
4092                 }
4093                 return;
4094         }
4095         if (is_Array_type(ent_type)) {
4096                 assert(has_array_upper_bound(ent_type, 0));
4097                 long n = get_array_upper_bound_int(ent_type, 0);
4098                 for (long i = 0; i < n; ++i) {
4099                         ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
4100                         ir_tarval *index_tv = new_tarval_from_long(i, mode_uint);
4101                         ir_node   *cnst     = new_d_Const(dbgi, index_tv);
4102                         ir_node   *in[1]    = { cnst };
4103                         ir_entity *arrent   = get_array_element_entity(ent_type);
4104                         ir_node   *addr     = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in,
4105                                                         arrent);
4106                         create_dynamic_null_initializer(arrent, dbgi, addr);
4107                 }
4108                 return;
4109         }
4110
4111         ir_mode *value_mode = get_type_mode(ent_type);
4112         ir_node *node       = new_Const(get_mode_null(value_mode));
4113
4114         /* is it a bitfield type? */
4115         if (is_Primitive_type(ent_type) &&
4116                         get_primitive_base_type(ent_type) != NULL) {
4117                 bitfield_store_to_firm(dbgi, entity, base_addr, node, false, false);
4118                 return;
4119         }
4120
4121         ir_node *mem    = get_store();
4122         ir_node *store  = new_d_Store(dbgi, mem, base_addr, node, cons_none);
4123         ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4124         set_store(proj_m);
4125 }
4126
4127 static void create_dynamic_initializer_sub(ir_initializer_t *initializer,
4128                 ir_entity *entity, ir_type *type, dbg_info *dbgi, ir_node *base_addr)
4129 {
4130         switch(get_initializer_kind(initializer)) {
4131         case IR_INITIALIZER_NULL:
4132                 create_dynamic_null_initializer(entity, dbgi, base_addr);
4133                 return;
4134         case IR_INITIALIZER_CONST: {
4135                 ir_node *node     = get_initializer_const_value(initializer);
4136                 ir_type *ent_type = get_entity_type(entity);
4137
4138                 /* is it a bitfield type? */
4139                 if (is_Primitive_type(ent_type) &&
4140                                 get_primitive_base_type(ent_type) != NULL) {
4141                         bitfield_store_to_firm(dbgi, entity, base_addr, node, false, false);
4142                         return;
4143                 }
4144
4145                 assert(get_type_mode(type) == get_irn_mode(node));
4146                 ir_node *mem    = get_store();
4147                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, node, cons_none);
4148                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4149                 set_store(proj_m);
4150                 return;
4151         }
4152         case IR_INITIALIZER_TARVAL: {
4153                 ir_tarval *tv       = get_initializer_tarval_value(initializer);
4154                 ir_node   *cnst     = new_d_Const(dbgi, tv);
4155                 ir_type   *ent_type = get_entity_type(entity);
4156
4157                 /* is it a bitfield type? */
4158                 if (is_Primitive_type(ent_type) &&
4159                                 get_primitive_base_type(ent_type) != NULL) {
4160                         bitfield_store_to_firm(dbgi, entity, base_addr, cnst, false, false);
4161                         return;
4162                 }
4163
4164                 assert(get_type_mode(type) == get_tarval_mode(tv));
4165                 ir_node *mem    = get_store();
4166                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, cnst, cons_none);
4167                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4168                 set_store(proj_m);
4169                 return;
4170         }
4171         case IR_INITIALIZER_COMPOUND: {
4172                 assert(is_compound_type(type) || is_Array_type(type));
4173                 int n_members;
4174                 if (is_Array_type(type)) {
4175                         assert(has_array_upper_bound(type, 0));
4176                         n_members = get_array_upper_bound_int(type, 0);
4177                 } else {
4178                         n_members = get_compound_n_members(type);
4179                 }
4180
4181                 if (get_initializer_compound_n_entries(initializer)
4182                                 != (unsigned) n_members)
4183                         panic("initializer doesn't match compound type");
4184
4185                 for (int i = 0; i < n_members; ++i) {
4186                         ir_node   *addr;
4187                         ir_type   *irtype;
4188                         ir_entity *sub_entity;
4189                         if (is_Array_type(type)) {
4190                                 ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
4191                                 ir_tarval *index_tv = new_tarval_from_long(i, mode_uint);
4192                                 ir_node   *cnst     = new_d_Const(dbgi, index_tv);
4193                                 ir_node   *in[1]    = { cnst };
4194                                 irtype     = get_array_element_type(type);
4195                                 sub_entity = get_array_element_entity(type);
4196                                 addr       = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in,
4197                                                        sub_entity);
4198                         } else {
4199                                 sub_entity = get_compound_member(type, i);
4200                                 irtype     = get_entity_type(sub_entity);
4201                                 addr       = new_d_simpleSel(dbgi, new_NoMem(), base_addr,
4202                                                              sub_entity);
4203                         }
4204
4205                         ir_initializer_t *sub_init
4206                                 = get_initializer_compound_value(initializer, i);
4207
4208                         create_dynamic_initializer_sub(sub_init, sub_entity, irtype, dbgi,
4209                                                        addr);
4210                 }
4211                 return;
4212         }
4213         }
4214
4215         panic("invalid IR_INITIALIZER found");
4216 }
4217
4218 static void create_dynamic_initializer(ir_initializer_t *initializer,
4219                 dbg_info *dbgi, ir_entity *entity)
4220 {
4221         ir_node *frame     = get_irg_frame(current_ir_graph);
4222         ir_node *base_addr = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
4223         ir_type *type      = get_entity_type(entity);
4224
4225         create_dynamic_initializer_sub(initializer, entity, type, dbgi, base_addr);
4226 }
4227
4228 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
4229                                      ir_entity *entity, type_t *type)
4230 {
4231         ir_node *memory = get_store();
4232         ir_node *nomem  = new_NoMem();
4233         ir_node *frame  = get_irg_frame(current_ir_graph);
4234         ir_node *addr   = new_d_simpleSel(dbgi, nomem, frame, entity);
4235
4236         if (initializer->kind == INITIALIZER_VALUE) {
4237                 initializer_value_t *initializer_value = &initializer->value;
4238
4239                 ir_node *value = expression_to_firm(initializer_value->value);
4240                 type = skip_typeref(type);
4241                 assign_value(dbgi, addr, type, value);
4242                 return;
4243         }
4244
4245         if (is_constant_initializer(initializer) == EXPR_CLASS_VARIABLE) {
4246                 ir_initializer_t *irinitializer
4247                         = create_ir_initializer(initializer, type);
4248
4249                 create_dynamic_initializer(irinitializer, dbgi, entity);
4250                 return;
4251         }
4252
4253         /* create a "template" entity which is copied to the entity on the stack */
4254         ir_entity *const init_entity
4255                 = create_initializer_entity(dbgi, initializer, type);
4256         ir_node *const src_addr = create_symconst(dbgi, init_entity);
4257         ir_type *const irtype   = get_ir_type(type);
4258         ir_node *const copyb    = new_d_CopyB(dbgi, memory, addr, src_addr, irtype);
4259
4260         ir_node *const copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
4261         set_store(copyb_mem);
4262 }
4263
4264 static void create_initializer_local_variable_entity(entity_t *entity)
4265 {
4266         assert(entity->kind == ENTITY_VARIABLE);
4267         initializer_t *initializer = entity->variable.initializer;
4268         dbg_info      *dbgi        = get_dbg_info(&entity->base.source_position);
4269         ir_entity     *irentity    = entity->variable.v.entity;
4270         type_t        *type        = entity->declaration.type;
4271
4272         create_local_initializer(initializer, dbgi, irentity, type);
4273 }
4274
4275 static void create_variable_initializer(entity_t *entity)
4276 {
4277         assert(entity->kind == ENTITY_VARIABLE);
4278         initializer_t *initializer = entity->variable.initializer;
4279         if (initializer == NULL)
4280                 return;
4281
4282         declaration_kind_t declaration_kind
4283                 = (declaration_kind_t) entity->declaration.kind;
4284         if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY) {
4285                 create_initializer_local_variable_entity(entity);
4286                 return;
4287         }
4288
4289         type_t            *type = entity->declaration.type;
4290         type_qualifiers_t  tq   = get_type_qualifier(type, true);
4291
4292         if (initializer->kind == INITIALIZER_VALUE) {
4293                 initializer_value_t *initializer_value = &initializer->value;
4294                 dbg_info            *dbgi = get_dbg_info(&entity->base.source_position);
4295                 expression_t        *value     = initializer_value->value;
4296                 type_t              *init_type = value->base.type;
4297                 type_t              *skipped   = skip_typeref(init_type);
4298
4299                 if (!is_type_scalar(skipped)) {
4300                         /* skip convs */
4301                         while (value->kind == EXPR_UNARY_CAST)
4302                                 value = value->unary.value;
4303
4304                         if (value->kind != EXPR_COMPOUND_LITERAL)
4305                                 panic("expected non-scalar initializer to be a compound literal");
4306                         initializer = value->compound_literal.initializer;
4307                         goto have_initializer;
4308                 }
4309
4310                 ir_node *node = expression_to_firm(initializer_value->value);
4311
4312                 ir_mode *mode      = get_ir_mode_storage(init_type);
4313                 node = create_conv(dbgi, node, mode);
4314                 node = do_strict_conv(dbgi, node);
4315
4316                 if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE) {
4317                         set_value(entity->variable.v.value_number, node);
4318                 } else {
4319                         assert(declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4320
4321                         ir_entity *irentity = entity->variable.v.entity;
4322
4323                         if (tq & TYPE_QUALIFIER_CONST
4324                                         && get_entity_owner(irentity) != get_tls_type()) {
4325                                 add_entity_linkage(irentity, IR_LINKAGE_CONSTANT);
4326                         }
4327                         set_atomic_ent_value(irentity, node);
4328                 }
4329         } else {
4330 have_initializer:
4331                 assert(declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY ||
4332                        declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4333
4334                 ir_entity        *irentity        = entity->variable.v.entity;
4335                 ir_initializer_t *irinitializer
4336                         = create_ir_initializer(initializer, type);
4337
4338                 if (tq & TYPE_QUALIFIER_CONST) {
4339                         add_entity_linkage(irentity, IR_LINKAGE_CONSTANT);
4340                 }
4341                 set_entity_initializer(irentity, irinitializer);
4342         }
4343 }
4344
4345 static void create_variable_length_array(entity_t *entity)
4346 {
4347         assert(entity->kind == ENTITY_VARIABLE);
4348         assert(entity->variable.initializer == NULL);
4349
4350         entity->declaration.kind    = DECLARATION_KIND_VARIABLE_LENGTH_ARRAY;
4351         entity->variable.v.vla_base = NULL;
4352
4353         /* TODO: record VLA somewhere so we create the free node when we leave
4354          * it's scope */
4355 }
4356
4357 static void allocate_variable_length_array(entity_t *entity)
4358 {
4359         assert(entity->kind == ENTITY_VARIABLE);
4360         assert(entity->variable.initializer == NULL);
4361         assert(currently_reachable());
4362
4363         dbg_info *dbgi      = get_dbg_info(&entity->base.source_position);
4364         type_t   *type      = entity->declaration.type;
4365         ir_type  *el_type   = get_ir_type(type->array.element_type);
4366
4367         /* make sure size_node is calculated */
4368         get_type_size_node(type);
4369         ir_node  *elems = type->array.size_node;
4370         ir_node  *mem   = get_store();
4371         ir_node  *alloc = new_d_Alloc(dbgi, mem, elems, el_type, stack_alloc);
4372
4373         ir_node  *proj_m = new_d_Proj(dbgi, alloc, mode_M, pn_Alloc_M);
4374         ir_node  *addr   = new_d_Proj(dbgi, alloc, mode_P_data, pn_Alloc_res);
4375         set_store(proj_m);
4376
4377         assert(entity->declaration.kind == DECLARATION_KIND_VARIABLE_LENGTH_ARRAY);
4378         entity->variable.v.vla_base = addr;
4379 }
4380
4381 /**
4382  * Creates a Firm local variable from a declaration.
4383  */
4384 static void create_local_variable(entity_t *entity)
4385 {
4386         assert(entity->kind == ENTITY_VARIABLE);
4387         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4388
4389         bool needs_entity = entity->variable.address_taken;
4390         type_t *type = skip_typeref(entity->declaration.type);
4391
4392         /* is it a variable length array? */
4393         if (is_type_array(type) && !type->array.size_constant) {
4394                 create_variable_length_array(entity);
4395                 return;
4396         } else if (is_type_array(type) || is_type_compound(type)) {
4397                 needs_entity = true;
4398         } else if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
4399                 needs_entity = true;
4400         }
4401
4402         if (needs_entity) {
4403                 ir_type *frame_type = get_irg_frame_type(current_ir_graph);
4404                 create_variable_entity(entity,
4405                                        DECLARATION_KIND_LOCAL_VARIABLE_ENTITY,
4406                                        frame_type);
4407         } else {
4408                 entity->declaration.kind        = DECLARATION_KIND_LOCAL_VARIABLE;
4409                 entity->variable.v.value_number = next_value_number_function;
4410                 set_irg_loc_description(current_ir_graph, next_value_number_function,
4411                                         entity);
4412                 ++next_value_number_function;
4413         }
4414 }
4415
4416 static void create_local_static_variable(entity_t *entity)
4417 {
4418         assert(entity->kind == ENTITY_VARIABLE);
4419         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4420
4421         type_t   *type           = skip_typeref(entity->declaration.type);
4422         ir_type  *const var_type = entity->variable.thread_local ?
4423                 get_tls_type() : get_glob_type();
4424         ir_type  *const irtype   = get_ir_type(type);
4425         dbg_info *const dbgi     = get_dbg_info(&entity->base.source_position);
4426
4427         size_t l = strlen(entity->base.symbol->string);
4428         char   buf[l + sizeof(".%u")];
4429         snprintf(buf, sizeof(buf), "%s.%%u", entity->base.symbol->string);
4430         ident     *const id       = id_unique(buf);
4431         ir_entity *const irentity = new_d_entity(var_type, id, irtype, dbgi);
4432
4433         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
4434                 set_entity_volatility(irentity, volatility_is_volatile);
4435         }
4436
4437         entity->declaration.kind  = DECLARATION_KIND_GLOBAL_VARIABLE;
4438         entity->variable.v.entity = irentity;
4439
4440         set_entity_ld_ident(irentity, id);
4441         set_entity_visibility(irentity, ir_visibility_local);
4442
4443         ir_graph *const old_current_ir_graph = current_ir_graph;
4444         current_ir_graph = get_const_code_irg();
4445
4446         create_variable_initializer(entity);
4447
4448         assert(current_ir_graph == get_const_code_irg());
4449         current_ir_graph = old_current_ir_graph;
4450 }
4451
4452
4453
4454 static ir_node *return_statement_to_firm(return_statement_t *statement)
4455 {
4456         if (!currently_reachable())
4457                 return NULL;
4458
4459         dbg_info *const dbgi = get_dbg_info(&statement->base.source_position);
4460         type_t   *const type = skip_typeref(current_function_entity->declaration.type->function.return_type);
4461
4462         ir_node *in[1];
4463         int      in_len;
4464         if (!is_type_void(type)) {
4465                 if (statement->value != NULL) {
4466                         ir_node *node = expression_to_firm(statement->value);
4467                         if (!is_type_compound(type)) {
4468                                 ir_mode *const mode = get_ir_mode_storage(type);
4469                                 node = create_conv(dbgi, node, mode);
4470                                 node = do_strict_conv(dbgi, node);
4471                         }
4472                         in[0] = node;
4473                 } else {
4474                         ir_mode *mode;
4475                         if (is_type_compound(type)) {
4476                                 mode = mode_P_data;
4477                         } else {
4478                                 mode = get_ir_mode_storage(type);
4479                         }
4480                         in[0] = new_Unknown(mode);
4481                 }
4482                 in_len = 1;
4483         } else {
4484                 /* build return_value for its side effects */
4485                 if (statement->value != NULL) {
4486                         expression_to_firm(statement->value);
4487                 }
4488                 in_len = 0;
4489         }
4490
4491         ir_node  *store = get_store();
4492         ir_node  *ret   = new_d_Return(dbgi, store, in_len, in);
4493
4494         ir_node *end_block = get_irg_end_block(current_ir_graph);
4495         add_immBlock_pred(end_block, ret);
4496
4497         set_unreachable_now();
4498         return NULL;
4499 }
4500
4501 static ir_node *expression_statement_to_firm(expression_statement_t *statement)
4502 {
4503         if (!currently_reachable())
4504                 return NULL;
4505
4506         return expression_to_firm(statement->expression);
4507 }
4508
4509 static ir_node *compound_statement_to_firm(compound_statement_t *compound)
4510 {
4511         entity_t *entity = compound->scope.entities;
4512         for ( ; entity != NULL; entity = entity->base.next) {
4513                 if (!is_declaration(entity))
4514                         continue;
4515
4516                 create_local_declaration(entity);
4517         }
4518
4519         ir_node     *result    = NULL;
4520         statement_t *statement = compound->statements;
4521         for ( ; statement != NULL; statement = statement->base.next) {
4522                 result = statement_to_firm(statement);
4523         }
4524
4525         return result;
4526 }
4527
4528 static void create_global_variable(entity_t *entity)
4529 {
4530         ir_linkage    linkage    = IR_LINKAGE_DEFAULT;
4531         ir_visibility visibility = ir_visibility_default;
4532         ir_entity    *irentity;
4533         assert(entity->kind == ENTITY_VARIABLE);
4534
4535         switch ((storage_class_tag_t)entity->declaration.storage_class) {
4536         case STORAGE_CLASS_EXTERN: visibility = ir_visibility_external; break;
4537         case STORAGE_CLASS_STATIC: visibility = ir_visibility_local;    break;
4538         case STORAGE_CLASS_NONE:
4539                 visibility = ir_visibility_default;
4540                 /* uninitialized globals get merged in C */
4541                 if (entity->variable.initializer == NULL)
4542                         linkage |= IR_LINKAGE_MERGE;
4543                 break;
4544         case STORAGE_CLASS_TYPEDEF:
4545         case STORAGE_CLASS_AUTO:
4546         case STORAGE_CLASS_REGISTER:
4547                 panic("invalid storage class for global var");
4548         }
4549
4550         ir_type *var_type = get_glob_type();
4551         if (entity->variable.thread_local) {
4552                 var_type = get_tls_type();
4553                 /* LINKAGE_MERGE not supported by current linkers */
4554                 linkage &= ~IR_LINKAGE_MERGE;
4555         }
4556         create_variable_entity(entity, DECLARATION_KIND_GLOBAL_VARIABLE, var_type);
4557         irentity = entity->variable.v.entity;
4558         add_entity_linkage(irentity, linkage);
4559         set_entity_visibility(irentity, visibility);
4560 }
4561
4562 static void create_local_declaration(entity_t *entity)
4563 {
4564         assert(is_declaration(entity));
4565
4566         /* construct type */
4567         (void) get_ir_type(entity->declaration.type);
4568         if (entity->base.symbol == NULL) {
4569                 return;
4570         }
4571
4572         switch ((storage_class_tag_t) entity->declaration.storage_class) {
4573         case STORAGE_CLASS_STATIC:
4574                 if (entity->kind == ENTITY_FUNCTION) {
4575                         (void)get_function_entity(entity, NULL);
4576                 } else {
4577                         create_local_static_variable(entity);
4578                 }
4579                 return;
4580         case STORAGE_CLASS_EXTERN:
4581                 if (entity->kind == ENTITY_FUNCTION) {
4582                         assert(entity->function.statement == NULL);
4583                         (void)get_function_entity(entity, NULL);
4584                 } else {
4585                         create_global_variable(entity);
4586                         create_variable_initializer(entity);
4587                 }
4588                 return;
4589         case STORAGE_CLASS_NONE:
4590         case STORAGE_CLASS_AUTO:
4591         case STORAGE_CLASS_REGISTER:
4592                 if (entity->kind == ENTITY_FUNCTION) {
4593                         if (entity->function.statement != NULL) {
4594                                 ir_type *owner = get_irg_frame_type(current_ir_graph);
4595                                 (void)get_function_entity(entity, owner);
4596                                 entity->declaration.kind = DECLARATION_KIND_INNER_FUNCTION;
4597                                 enqueue_inner_function(entity);
4598                         } else {
4599                                 (void)get_function_entity(entity, NULL);
4600                         }
4601                 } else {
4602                         create_local_variable(entity);
4603                 }
4604                 return;
4605         case STORAGE_CLASS_TYPEDEF:
4606                 break;
4607         }
4608         panic("invalid storage class found");
4609 }
4610
4611 static void initialize_local_declaration(entity_t *entity)
4612 {
4613         if (entity->base.symbol == NULL)
4614                 return;
4615
4616         // no need to emit code in dead blocks
4617         if (entity->declaration.storage_class != STORAGE_CLASS_STATIC
4618                         && !currently_reachable())
4619                 return;
4620
4621         switch ((declaration_kind_t) entity->declaration.kind) {
4622         case DECLARATION_KIND_LOCAL_VARIABLE:
4623         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY:
4624                 create_variable_initializer(entity);
4625                 return;
4626
4627         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
4628                 allocate_variable_length_array(entity);
4629                 return;
4630
4631         case DECLARATION_KIND_COMPOUND_MEMBER:
4632         case DECLARATION_KIND_GLOBAL_VARIABLE:
4633         case DECLARATION_KIND_FUNCTION:
4634         case DECLARATION_KIND_INNER_FUNCTION:
4635                 return;
4636
4637         case DECLARATION_KIND_PARAMETER:
4638         case DECLARATION_KIND_PARAMETER_ENTITY:
4639                 panic("can't initialize parameters");
4640
4641         case DECLARATION_KIND_UNKNOWN:
4642                 panic("can't initialize unknown declaration");
4643         }
4644         panic("invalid declaration kind");
4645 }
4646
4647 static ir_node *declaration_statement_to_firm(declaration_statement_t *statement)
4648 {
4649         entity_t *entity = statement->declarations_begin;
4650         if (entity == NULL)
4651                 return NULL;
4652
4653         entity_t *const last = statement->declarations_end;
4654         for ( ;; entity = entity->base.next) {
4655                 if (is_declaration(entity)) {
4656                         initialize_local_declaration(entity);
4657                 } else if (entity->kind == ENTITY_TYPEDEF) {
4658                         /* §6.7.7:3  Any array size expressions associated with variable length
4659                          * array declarators are evaluated each time the declaration of the
4660                          * typedef name is reached in the order of execution. */
4661                         type_t *const type = skip_typeref(entity->typedefe.type);
4662                         if (is_type_array(type) && type->array.is_vla)
4663                                 get_vla_size(&type->array);
4664                 }
4665                 if (entity == last)
4666                         break;
4667         }
4668
4669         return NULL;
4670 }
4671
4672 static ir_node *if_statement_to_firm(if_statement_t *statement)
4673 {
4674         /* Create the condition. */
4675         ir_node *true_block  = NULL;
4676         ir_node *false_block = NULL;
4677         if (currently_reachable()) {
4678                 true_block  = new_immBlock();
4679                 false_block = new_immBlock();
4680                 create_condition_evaluation(statement->condition, true_block, false_block);
4681                 mature_immBlock(true_block);
4682                 mature_immBlock(false_block);
4683         }
4684
4685         /* Create the true statement. */
4686         set_cur_block(true_block);
4687         statement_to_firm(statement->true_statement);
4688         ir_node *fallthrough_block = get_cur_block();
4689
4690         /* Create the false statement. */
4691         set_cur_block(false_block);
4692         if (statement->false_statement != NULL) {
4693                 statement_to_firm(statement->false_statement);
4694         }
4695
4696         /* Handle the block after the if-statement.  Minor simplification and
4697          * optimisation: Reuse the false/true block as fallthrough block, if the
4698          * true/false statement does not pass control to the fallthrough block, e.g.
4699          * in the typical if (x) return; pattern. */
4700         if (fallthrough_block) {
4701                 if (currently_reachable()) {
4702                         ir_node *const t_jump = new_r_Jmp(fallthrough_block);
4703                         ir_node *const f_jump = new_Jmp();
4704                         ir_node *const in[]   = { t_jump, f_jump };
4705                         fallthrough_block = new_Block(2, in);
4706                 }
4707                 set_cur_block(fallthrough_block);
4708         }
4709
4710         return NULL;
4711 }
4712
4713 /**
4714  * Add an unconditional jump to the target block.  If the source block is not
4715  * reachable, then a Bad predecessor is created to prevent Phi-less unreachable
4716  * loops.  This is necessary if the jump potentially enters a loop.
4717  */
4718 static void jump_to(ir_node *const target_block)
4719 {
4720         ir_node *const pred = currently_reachable() ? new_Jmp() : new_Bad(mode_X);
4721         add_immBlock_pred(target_block, pred);
4722 }
4723
4724 /**
4725  * Add an unconditional jump to the target block, if the current block is
4726  * reachable and do nothing otherwise.  This is only valid if the jump does not
4727  * enter a loop (a back edge is ok).
4728  */
4729 static void jump_if_reachable(ir_node *const target_block)
4730 {
4731         if (currently_reachable())
4732                 add_immBlock_pred(target_block, new_Jmp());
4733 }
4734
4735 static ir_node *while_statement_to_firm(while_statement_t *statement)
4736 {
4737         /* Create the header block */
4738         ir_node *const header_block = new_immBlock();
4739         jump_to(header_block);
4740
4741         /* Create the condition. */
4742         ir_node      *      body_block;
4743         ir_node      *      false_block;
4744         expression_t *const cond = statement->condition;
4745         if (is_constant_expression(cond) == EXPR_CLASS_CONSTANT &&
4746                         fold_constant_to_bool(cond)) {
4747                 /* Shortcut for while (true). */
4748                 body_block  = header_block;
4749                 false_block = NULL;
4750
4751                 keep_alive(header_block);
4752                 keep_all_memory(header_block);
4753         } else {
4754                 body_block  = new_immBlock();
4755                 false_block = new_immBlock();
4756
4757                 set_cur_block(header_block);
4758                 create_condition_evaluation(cond, body_block, false_block);
4759                 mature_immBlock(body_block);
4760         }
4761
4762         ir_node *const old_continue_label = continue_label;
4763         ir_node *const old_break_label    = break_label;
4764         continue_label = header_block;
4765         break_label    = false_block;
4766
4767         /* Create the loop body. */
4768         set_cur_block(body_block);
4769         statement_to_firm(statement->body);
4770         jump_if_reachable(header_block);
4771
4772         mature_immBlock(header_block);
4773         assert(false_block == NULL || false_block == break_label);
4774         false_block = break_label;
4775         if (false_block != NULL) {
4776                 mature_immBlock(false_block);
4777         }
4778         set_cur_block(false_block);
4779
4780         assert(continue_label == header_block);
4781         continue_label = old_continue_label;
4782         break_label    = old_break_label;
4783         return NULL;
4784 }
4785
4786 static ir_node *get_break_label(void)
4787 {
4788         if (break_label == NULL) {
4789                 break_label = new_immBlock();
4790         }
4791         return break_label;
4792 }
4793
4794 static ir_node *do_while_statement_to_firm(do_while_statement_t *statement)
4795 {
4796         /* create the header block */
4797         ir_node *header_block = new_immBlock();
4798
4799         /* the loop body */
4800         ir_node *body_block = new_immBlock();
4801         jump_to(body_block);
4802
4803         ir_node *old_continue_label = continue_label;
4804         ir_node *old_break_label    = break_label;
4805         continue_label              = header_block;
4806         break_label                 = NULL;
4807
4808         set_cur_block(body_block);
4809         statement_to_firm(statement->body);
4810         ir_node *const false_block = get_break_label();
4811
4812         assert(continue_label == header_block);
4813         continue_label = old_continue_label;
4814         break_label    = old_break_label;
4815
4816         jump_if_reachable(header_block);
4817
4818         /* create the condition */
4819         mature_immBlock(header_block);
4820         set_cur_block(header_block);
4821
4822         create_condition_evaluation(statement->condition, body_block, false_block);
4823         mature_immBlock(body_block);
4824         mature_immBlock(false_block);
4825
4826         set_cur_block(false_block);
4827         return NULL;
4828 }
4829
4830 static ir_node *for_statement_to_firm(for_statement_t *statement)
4831 {
4832         /* create declarations */
4833         entity_t *entity = statement->scope.entities;
4834         for ( ; entity != NULL; entity = entity->base.next) {
4835                 if (!is_declaration(entity))
4836                         continue;
4837
4838                 create_local_declaration(entity);
4839         }
4840
4841         if (currently_reachable()) {
4842                 entity = statement->scope.entities;
4843                 for ( ; entity != NULL; entity = entity->base.next) {
4844                         if (!is_declaration(entity))
4845                                 continue;
4846
4847                         initialize_local_declaration(entity);
4848                 }
4849
4850                 if (statement->initialisation != NULL) {
4851                         expression_to_firm(statement->initialisation);
4852                 }
4853         }
4854
4855         /* Create the header block */
4856         ir_node *const header_block = new_immBlock();
4857         jump_to(header_block);
4858
4859         /* Create the condition. */
4860         ir_node *body_block;
4861         ir_node *false_block;
4862         if (statement->condition != NULL) {
4863                 body_block  = new_immBlock();
4864                 false_block = new_immBlock();
4865
4866                 set_cur_block(header_block);
4867                 create_condition_evaluation(statement->condition, body_block, false_block);
4868                 mature_immBlock(body_block);
4869         } else {
4870                 /* for-ever. */
4871                 body_block  = header_block;
4872                 false_block = NULL;
4873
4874                 keep_alive(header_block);
4875                 keep_all_memory(header_block);
4876         }
4877
4878         /* Create the step block, if necessary. */
4879         ir_node      *      step_block = header_block;
4880         expression_t *const step       = statement->step;
4881         if (step != NULL) {
4882                 step_block = new_immBlock();
4883         }
4884
4885         ir_node *const old_continue_label = continue_label;
4886         ir_node *const old_break_label    = break_label;
4887         continue_label = step_block;
4888         break_label    = false_block;
4889
4890         /* Create the loop body. */
4891         set_cur_block(body_block);
4892         statement_to_firm(statement->body);
4893         jump_if_reachable(step_block);
4894
4895         /* Create the step code. */
4896         if (step != NULL) {
4897                 mature_immBlock(step_block);
4898                 set_cur_block(step_block);
4899                 expression_to_firm(step);
4900                 jump_if_reachable(header_block);
4901         }
4902
4903         mature_immBlock(header_block);
4904         assert(false_block == NULL || false_block == break_label);
4905         false_block = break_label;
4906         if (false_block != NULL) {
4907                 mature_immBlock(false_block);
4908         }
4909         set_cur_block(false_block);
4910
4911         assert(continue_label == step_block);
4912         continue_label = old_continue_label;
4913         break_label    = old_break_label;
4914         return NULL;
4915 }
4916
4917 static ir_node *create_jump_statement(const statement_t *statement, ir_node *target_block)
4918 {
4919         if (!currently_reachable())
4920                 return NULL;
4921
4922         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
4923         ir_node  *jump = new_d_Jmp(dbgi);
4924         add_immBlock_pred(target_block, jump);
4925
4926         set_unreachable_now();
4927         return NULL;
4928 }
4929
4930 static ir_switch_table *create_switch_table(const switch_statement_t *statement)
4931 {
4932         /* determine number of cases */
4933         size_t n_cases = 0;
4934         for (case_label_statement_t *l = statement->first_case; l != NULL;
4935              l = l->next) {
4936                 /* default case */
4937                 if (l->expression == NULL)
4938                         continue;
4939                 if (l->is_empty_range)
4940                         continue;
4941                 ++n_cases;
4942         }
4943
4944         ir_switch_table *res = ir_new_switch_table(current_ir_graph, n_cases);
4945         size_t           i   = 0;
4946         for (case_label_statement_t *l = statement->first_case; l != NULL;
4947              l = l->next) {
4948             if (l->expression == NULL) {
4949                         l->pn = pn_Switch_default;
4950                         continue;
4951                 }
4952                 if (l->is_empty_range)
4953                         continue;
4954                 ir_tarval *min = fold_constant_to_tarval(l->expression);
4955                 ir_tarval *max = min;
4956                 long       pn  = (long) i+1;
4957                 if (l->end_range != NULL)
4958                         max = fold_constant_to_tarval(l->end_range);
4959                 ir_switch_table_set(res, i++, min, max, pn);
4960                 l->pn = pn;
4961         }
4962         return res;
4963 }
4964
4965 static ir_node *switch_statement_to_firm(switch_statement_t *statement)
4966 {
4967         dbg_info *dbgi        = get_dbg_info(&statement->base.source_position);
4968         ir_node  *switch_node = NULL;
4969
4970         if (currently_reachable()) {
4971                 ir_node *expression = expression_to_firm(statement->expression);
4972                 ir_switch_table *table = create_switch_table(statement);
4973                 unsigned n_outs = (unsigned)ir_switch_table_get_n_entries(table) + 1;
4974
4975                 switch_node = new_d_Switch(dbgi, expression, n_outs, table);
4976         }
4977
4978         set_unreachable_now();
4979
4980         ir_node *const old_switch            = current_switch;
4981         ir_node *const old_break_label       = break_label;
4982         const bool     old_saw_default_label = saw_default_label;
4983         saw_default_label                    = false;
4984         current_switch                       = switch_node;
4985         break_label                          = NULL;
4986
4987         statement_to_firm(statement->body);
4988
4989         if (currently_reachable()) {
4990                 add_immBlock_pred(get_break_label(), new_Jmp());
4991         }
4992
4993         if (!saw_default_label && switch_node) {
4994                 ir_node *proj = new_d_Proj(dbgi, switch_node, mode_X, pn_Switch_default);
4995                 add_immBlock_pred(get_break_label(), proj);
4996         }
4997
4998         if (break_label != NULL) {
4999                 mature_immBlock(break_label);
5000         }
5001         set_cur_block(break_label);
5002
5003         assert(current_switch == switch_node);
5004         current_switch    = old_switch;
5005         break_label       = old_break_label;
5006         saw_default_label = old_saw_default_label;
5007         return NULL;
5008 }
5009
5010 static ir_node *case_label_to_firm(const case_label_statement_t *statement)
5011 {
5012         if (statement->is_empty_range)
5013                 return NULL;
5014
5015         if (current_switch != NULL) {
5016                 ir_node *block = new_immBlock();
5017                 /* Fallthrough from previous case */
5018                 jump_if_reachable(block);
5019
5020                 ir_node  *const proj = new_Proj(current_switch, mode_X, statement->pn);
5021                 add_immBlock_pred(block, proj);
5022                 if (statement->expression == NULL)
5023                         saw_default_label = true;
5024
5025                 mature_immBlock(block);
5026                 set_cur_block(block);
5027         }
5028
5029         return statement_to_firm(statement->statement);
5030 }
5031
5032 static ir_node *label_to_firm(const label_statement_t *statement)
5033 {
5034         ir_node *block = get_label_block(statement->label);
5035         jump_to(block);
5036
5037         set_cur_block(block);
5038         keep_alive(block);
5039         keep_all_memory(block);
5040
5041         return statement_to_firm(statement->statement);
5042 }
5043
5044 static ir_node *computed_goto_to_firm(computed_goto_statement_t const *const statement)
5045 {
5046         if (!currently_reachable())
5047                 return NULL;
5048
5049         ir_node  *const irn  = expression_to_firm(statement->expression);
5050         dbg_info *const dbgi = get_dbg_info(&statement->base.source_position);
5051         ir_node  *const ijmp = new_d_IJmp(dbgi, irn);
5052
5053         set_irn_link(ijmp, ijmp_list);
5054         ijmp_list = ijmp;
5055
5056         set_unreachable_now();
5057         return NULL;
5058 }
5059
5060 static ir_node *asm_statement_to_firm(const asm_statement_t *statement)
5061 {
5062         bool needs_memory = false;
5063
5064         if (statement->is_volatile) {
5065                 needs_memory = true;
5066         }
5067
5068         size_t         n_clobbers = 0;
5069         asm_clobber_t *clobber    = statement->clobbers;
5070         for ( ; clobber != NULL; clobber = clobber->next) {
5071                 const char *clobber_str = clobber->clobber.begin;
5072
5073                 if (!be_is_valid_clobber(clobber_str)) {
5074                         errorf(&statement->base.source_position,
5075                                    "invalid clobber '%s' specified", clobber->clobber);
5076                         continue;
5077                 }
5078
5079                 if (streq(clobber_str, "memory")) {
5080                         needs_memory = true;
5081                         continue;
5082                 }
5083
5084                 ident *id = new_id_from_str(clobber_str);
5085                 obstack_ptr_grow(&asm_obst, id);
5086                 ++n_clobbers;
5087         }
5088         assert(obstack_object_size(&asm_obst) == n_clobbers * sizeof(ident*));
5089         ident **clobbers = NULL;
5090         if (n_clobbers > 0) {
5091                 clobbers = obstack_finish(&asm_obst);
5092         }
5093
5094         size_t n_inputs  = 0;
5095         asm_argument_t *argument = statement->inputs;
5096         for ( ; argument != NULL; argument = argument->next)
5097                 n_inputs++;
5098         size_t n_outputs = 0;
5099         argument = statement->outputs;
5100         for ( ; argument != NULL; argument = argument->next)
5101                 n_outputs++;
5102
5103         unsigned next_pos = 0;
5104
5105         ir_node *ins[n_inputs + n_outputs + 1];
5106         size_t   in_size = 0;
5107
5108         ir_asm_constraint tmp_in_constraints[n_outputs];
5109
5110         const expression_t *out_exprs[n_outputs];
5111         ir_node            *out_addrs[n_outputs];
5112         size_t              out_size = 0;
5113
5114         argument = statement->outputs;
5115         for ( ; argument != NULL; argument = argument->next) {
5116                 const char *constraints = argument->constraints.begin;
5117                 asm_constraint_flags_t asm_flags
5118                         = be_parse_asm_constraints(constraints);
5119
5120                 {
5121                         source_position_t const *const pos = &statement->base.source_position;
5122                         if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
5123                                 warningf(WARN_OTHER, pos, "some constraints in '%s' are not supported", constraints);
5124                         }
5125                         if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
5126                                 errorf(pos, "some constraints in '%s' are invalid", constraints);
5127                                 continue;
5128                         }
5129                         if (! (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE)) {
5130                                 errorf(pos, "no write flag specified for output constraints '%s'", constraints);
5131                                 continue;
5132                         }
5133                 }
5134
5135                 unsigned pos = next_pos++;
5136                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
5137                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
5138                         expression_t *expr = argument->expression;
5139                         ir_node      *addr = expression_to_addr(expr);
5140                         /* in+output, construct an artifical same_as constraint on the
5141                          * input */
5142                         if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_READ) {
5143                                 char     buf[64];
5144                                 ir_node *value = get_value_from_lvalue(expr, addr);
5145
5146                                 snprintf(buf, sizeof(buf), "%u", (unsigned) out_size);
5147
5148                                 ir_asm_constraint constraint;
5149                                 constraint.pos              = pos;
5150                                 constraint.constraint       = new_id_from_str(buf);
5151                                 constraint.mode             = get_ir_mode_storage(expr->base.type);
5152                                 tmp_in_constraints[in_size] = constraint;
5153                                 ins[in_size] = value;
5154
5155                                 ++in_size;
5156                         }
5157
5158                         out_exprs[out_size] = expr;
5159                         out_addrs[out_size] = addr;
5160                         ++out_size;
5161                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
5162                         /* pure memory ops need no input (but we have to make sure we
5163                          * attach to the memory) */
5164                         assert(! (asm_flags &
5165                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
5166                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
5167                         needs_memory = true;
5168
5169                         /* we need to attach the address to the inputs */
5170                         expression_t *expr = argument->expression;
5171
5172                         ir_asm_constraint constraint;
5173                         constraint.pos              = pos;
5174                         constraint.constraint       = new_id_from_str(constraints);
5175                         constraint.mode             = mode_M;
5176                         tmp_in_constraints[in_size] = constraint;
5177
5178                         ins[in_size]          = expression_to_addr(expr);
5179                         ++in_size;
5180                         continue;
5181                 } else {
5182                         errorf(&statement->base.source_position,
5183                                "only modifiers but no place set in constraints '%s'",
5184                                constraints);
5185                         continue;
5186                 }
5187
5188                 ir_asm_constraint constraint;
5189                 constraint.pos        = pos;
5190                 constraint.constraint = new_id_from_str(constraints);
5191                 constraint.mode       = get_ir_mode_storage(argument->expression->base.type);
5192
5193                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5194         }
5195         assert(obstack_object_size(&asm_obst)
5196                         == out_size * sizeof(ir_asm_constraint));
5197         ir_asm_constraint *output_constraints = obstack_finish(&asm_obst);
5198
5199
5200         obstack_grow(&asm_obst, tmp_in_constraints,
5201                      in_size * sizeof(tmp_in_constraints[0]));
5202         /* find and count input and output arguments */
5203         argument = statement->inputs;
5204         for ( ; argument != NULL; argument = argument->next) {
5205                 const char *constraints = argument->constraints.begin;
5206                 asm_constraint_flags_t asm_flags
5207                         = be_parse_asm_constraints(constraints);
5208
5209                 if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
5210                         errorf(&statement->base.source_position,
5211                                "some constraints in '%s' are not supported", constraints);
5212                         continue;
5213                 }
5214                 if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
5215                         errorf(&statement->base.source_position,
5216                                "some constraints in '%s' are invalid", constraints);
5217                         continue;
5218                 }
5219                 if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE) {
5220                         errorf(&statement->base.source_position,
5221                                "write flag specified for input constraints '%s'",
5222                                constraints);
5223                         continue;
5224                 }
5225
5226                 ir_node *input;
5227                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
5228                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
5229                         /* we can treat this as "normal" input */
5230                         input = expression_to_firm(argument->expression);
5231                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
5232                         /* pure memory ops need no input (but we have to make sure we
5233                          * attach to the memory) */
5234                         assert(! (asm_flags &
5235                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
5236                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
5237                         needs_memory = true;
5238                         input = expression_to_addr(argument->expression);
5239                 } else {
5240                         errorf(&statement->base.source_position,
5241                                "only modifiers but no place set in constraints '%s'",
5242                                constraints);
5243                         continue;
5244                 }
5245
5246                 ir_asm_constraint constraint;
5247                 constraint.pos        = next_pos++;
5248                 constraint.constraint = new_id_from_str(constraints);
5249                 constraint.mode       = get_irn_mode(input);
5250
5251                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5252                 ins[in_size++] = input;
5253         }
5254
5255         if (needs_memory) {
5256                 ir_asm_constraint constraint;
5257                 constraint.pos        = next_pos++;
5258                 constraint.constraint = new_id_from_str("");
5259                 constraint.mode       = mode_M;
5260
5261                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5262                 ins[in_size++] = get_store();
5263         }
5264
5265         assert(obstack_object_size(&asm_obst)
5266                         == in_size * sizeof(ir_asm_constraint));
5267         ir_asm_constraint *input_constraints = obstack_finish(&asm_obst);
5268
5269         /* create asm node */
5270         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
5271
5272         ident *asm_text = new_id_from_str(statement->asm_text.begin);
5273
5274         ir_node *node = new_d_ASM(dbgi, in_size, ins, input_constraints,
5275                                   out_size, output_constraints,
5276                                   n_clobbers, clobbers, asm_text);
5277
5278         if (statement->is_volatile) {
5279                 set_irn_pinned(node, op_pin_state_pinned);
5280         } else {
5281                 set_irn_pinned(node, op_pin_state_floats);
5282         }
5283
5284         /* create output projs & connect them */
5285         if (needs_memory) {
5286                 ir_node *projm = new_Proj(node, mode_M, out_size);
5287                 set_store(projm);
5288         }
5289
5290         size_t i;
5291         for (i = 0; i < out_size; ++i) {
5292                 const expression_t *out_expr = out_exprs[i];
5293                 long                pn       = i;
5294                 ir_mode            *mode     = get_ir_mode_storage(out_expr->base.type);
5295                 ir_node            *proj     = new_Proj(node, mode, pn);
5296                 ir_node            *addr     = out_addrs[i];
5297
5298                 set_value_for_expression_addr(out_expr, proj, addr);
5299         }
5300
5301         return NULL;
5302 }
5303
5304 static ir_node *ms_try_statement_to_firm(ms_try_statement_t *statement)
5305 {
5306         statement_to_firm(statement->try_statement);
5307         source_position_t const *const pos = &statement->base.source_position;
5308         warningf(WARN_OTHER, pos, "structured exception handling ignored");
5309         return NULL;
5310 }
5311
5312 static ir_node *leave_statement_to_firm(leave_statement_t *statement)
5313 {
5314         errorf(&statement->base.source_position, "__leave not supported yet");
5315         return NULL;
5316 }
5317
5318 /**
5319  * Transform a statement.
5320  */
5321 static ir_node *statement_to_firm(statement_t *const stmt)
5322 {
5323 #ifndef NDEBUG
5324         assert(!stmt->base.transformed);
5325         stmt->base.transformed = true;
5326 #endif
5327
5328         switch (stmt->kind) {
5329         case STATEMENT_ASM:           return asm_statement_to_firm(        &stmt->asms);
5330         case STATEMENT_CASE_LABEL:    return case_label_to_firm(           &stmt->case_label);
5331         case STATEMENT_COMPOUND:      return compound_statement_to_firm(   &stmt->compound);
5332         case STATEMENT_COMPUTED_GOTO: return computed_goto_to_firm(        &stmt->computed_goto);
5333         case STATEMENT_DECLARATION:   return declaration_statement_to_firm(&stmt->declaration);
5334         case STATEMENT_DO_WHILE:      return do_while_statement_to_firm(   &stmt->do_while);
5335         case STATEMENT_EMPTY:         return NULL; /* nothing */
5336         case STATEMENT_EXPRESSION:    return expression_statement_to_firm( &stmt->expression);
5337         case STATEMENT_FOR:           return for_statement_to_firm(        &stmt->fors);
5338         case STATEMENT_IF:            return if_statement_to_firm(         &stmt->ifs);
5339         case STATEMENT_LABEL:         return label_to_firm(                &stmt->label);
5340         case STATEMENT_LEAVE:         return leave_statement_to_firm(      &stmt->leave);
5341         case STATEMENT_MS_TRY:        return ms_try_statement_to_firm(     &stmt->ms_try);
5342         case STATEMENT_RETURN:        return return_statement_to_firm(     &stmt->returns);
5343         case STATEMENT_SWITCH:        return switch_statement_to_firm(     &stmt->switchs);
5344         case STATEMENT_WHILE:         return while_statement_to_firm(      &stmt->whiles);
5345
5346         case STATEMENT_BREAK:         return create_jump_statement(stmt, get_break_label());
5347         case STATEMENT_CONTINUE:      return create_jump_statement(stmt, continue_label);
5348         case STATEMENT_GOTO:          return create_jump_statement(stmt, get_label_block(stmt->gotos.label));
5349
5350         case STATEMENT_ERROR: panic("error statement found");
5351         }
5352         panic("statement not implemented");
5353 }
5354
5355 static int count_local_variables(const entity_t *entity,
5356                                  const entity_t *const last)
5357 {
5358         int count = 0;
5359         entity_t const *const end = last != NULL ? last->base.next : NULL;
5360         for (; entity != end; entity = entity->base.next) {
5361                 type_t *type;
5362                 bool    address_taken;
5363
5364                 if (entity->kind == ENTITY_VARIABLE) {
5365                         type          = skip_typeref(entity->declaration.type);
5366                         address_taken = entity->variable.address_taken;
5367                 } else if (entity->kind == ENTITY_PARAMETER) {
5368                         type          = skip_typeref(entity->declaration.type);
5369                         address_taken = entity->parameter.address_taken;
5370                 } else {
5371                         continue;
5372                 }
5373
5374                 if (!address_taken && is_type_scalar(type))
5375                         ++count;
5376         }
5377         return count;
5378 }
5379
5380 static void count_local_variables_in_stmt(statement_t *stmt, void *const env)
5381 {
5382         int *const count = env;
5383
5384         switch (stmt->kind) {
5385         case STATEMENT_DECLARATION: {
5386                 const declaration_statement_t *const decl_stmt = &stmt->declaration;
5387                 *count += count_local_variables(decl_stmt->declarations_begin,
5388                                 decl_stmt->declarations_end);
5389                 break;
5390         }
5391
5392         case STATEMENT_FOR:
5393                 *count += count_local_variables(stmt->fors.scope.entities, NULL);
5394                 break;
5395
5396         default:
5397                 break;
5398         }
5399 }
5400
5401 /**
5402  * Return the number of local (alias free) variables used by a function.
5403  */
5404 static int get_function_n_local_vars(entity_t *entity)
5405 {
5406         const function_t *function = &entity->function;
5407         int count = 0;
5408
5409         /* count parameters */
5410         count += count_local_variables(function->parameters.entities, NULL);
5411
5412         /* count local variables declared in body */
5413         walk_statements(function->statement, count_local_variables_in_stmt, &count);
5414         return count;
5415 }
5416
5417 /**
5418  * Build Firm code for the parameters of a function.
5419  */
5420 static void initialize_function_parameters(entity_t *entity)
5421 {
5422         assert(entity->kind == ENTITY_FUNCTION);
5423         ir_graph *irg             = current_ir_graph;
5424         ir_node  *args            = get_irg_args(irg);
5425         int       n               = 0;
5426         ir_type  *function_irtype;
5427
5428         if (entity->function.need_closure) {
5429                 /* add an extra parameter for the static link */
5430                 entity->function.static_link = new_r_Proj(args, mode_P_data, 0);
5431                 ++n;
5432
5433                 /* Matze: IMO this is wrong, nested functions should have an own
5434                  * type and not rely on strange parameters... */
5435                 function_irtype = create_method_type(&entity->declaration.type->function, true);
5436         } else {
5437                 function_irtype = get_ir_type(entity->declaration.type);
5438         }
5439
5440
5441
5442         entity_t *parameter = entity->function.parameters.entities;
5443         for ( ; parameter != NULL; parameter = parameter->base.next, ++n) {
5444                 if (parameter->kind != ENTITY_PARAMETER)
5445                         continue;
5446
5447                 assert(parameter->declaration.kind == DECLARATION_KIND_UNKNOWN);
5448                 type_t *type = skip_typeref(parameter->declaration.type);
5449
5450                 bool needs_entity = parameter->parameter.address_taken;
5451                 assert(!is_type_array(type));
5452                 if (is_type_compound(type)) {
5453                         needs_entity = true;
5454                 }
5455
5456                 ir_type *param_irtype = get_method_param_type(function_irtype, n);
5457                 if (needs_entity) {
5458                         ir_type   *frame_type = get_irg_frame_type(irg);
5459                         ir_entity *param
5460                                 = new_parameter_entity(frame_type, n, param_irtype);
5461                         parameter->declaration.kind
5462                                 = DECLARATION_KIND_PARAMETER_ENTITY;
5463                         parameter->parameter.v.entity = param;
5464                         continue;
5465                 }
5466
5467                 ir_mode *param_mode = get_type_mode(param_irtype);
5468                 long     pn         = n;
5469                 ir_node *value      = new_r_Proj(args, param_mode, pn);
5470
5471                 ir_mode *mode = get_ir_mode_storage(type);
5472                 value = create_conv(NULL, value, mode);
5473                 value = do_strict_conv(NULL, value);
5474
5475                 parameter->declaration.kind         = DECLARATION_KIND_PARAMETER;
5476                 parameter->parameter.v.value_number = next_value_number_function;
5477                 set_irg_loc_description(current_ir_graph, next_value_number_function,
5478                                         parameter);
5479                 ++next_value_number_function;
5480
5481                 set_value(parameter->parameter.v.value_number, value);
5482         }
5483 }
5484
5485 /**
5486  * Handle additional decl modifiers for IR-graphs
5487  *
5488  * @param irg            the IR-graph
5489  * @param dec_modifiers  additional modifiers
5490  */
5491 static void handle_decl_modifier_irg(ir_graph *irg,
5492                                      decl_modifiers_t decl_modifiers)
5493 {
5494         if (decl_modifiers & DM_NAKED) {
5495                 /* TRUE if the declaration includes the Microsoft
5496                    __declspec(naked) specifier. */
5497                 add_irg_additional_properties(irg, mtp_property_naked);
5498         }
5499         if (decl_modifiers & DM_FORCEINLINE) {
5500                 /* TRUE if the declaration includes the
5501                    Microsoft __forceinline specifier. */
5502                 set_irg_inline_property(irg, irg_inline_forced);
5503         }
5504         if (decl_modifiers & DM_NOINLINE) {
5505                 /* TRUE if the declaration includes the Microsoft
5506                    __declspec(noinline) specifier. */
5507                 set_irg_inline_property(irg, irg_inline_forbidden);
5508         }
5509 }
5510
5511 static void add_function_pointer(ir_type *segment, ir_entity *method,
5512                                  const char *unique_template)
5513 {
5514         ir_type   *method_type  = get_entity_type(method);
5515         ir_type   *ptr_type     = new_type_pointer(method_type);
5516
5517         /* these entities don't really have a name but firm only allows
5518          * "" in ld_ident.
5519          * Note that we mustn't give these entities a name since for example
5520          * Mach-O doesn't allow them. */
5521         ident     *ide          = id_unique(unique_template);
5522         ir_entity *ptr          = new_entity(segment, ide, ptr_type);
5523         ir_graph  *irg          = get_const_code_irg();
5524         ir_node   *val          = new_rd_SymConst_addr_ent(NULL, irg, mode_P_code,
5525                                                            method);
5526
5527         set_entity_ld_ident(ptr, new_id_from_chars("", 0));
5528         set_entity_compiler_generated(ptr, 1);
5529         set_entity_visibility(ptr, ir_visibility_private);
5530         add_entity_linkage(ptr, IR_LINKAGE_CONSTANT|IR_LINKAGE_HIDDEN_USER);
5531         set_atomic_ent_value(ptr, val);
5532 }
5533
5534 /**
5535  * Generate possible IJmp branches to a given label block.
5536  */
5537 static void gen_ijmp_branches(ir_node *block)
5538 {
5539         ir_node *ijmp;
5540         for (ijmp = ijmp_list; ijmp != NULL; ijmp = get_irn_link(ijmp)) {
5541                 add_immBlock_pred(block, ijmp);
5542         }
5543 }
5544
5545 /**
5546  * Create code for a function and all inner functions.
5547  *
5548  * @param entity  the function entity
5549  */
5550 static void create_function(entity_t *entity)
5551 {
5552         assert(entity->kind == ENTITY_FUNCTION);
5553         ir_entity *function_entity = get_function_entity(entity, current_outer_frame);
5554
5555         if (entity->function.statement == NULL)
5556                 return;
5557
5558         inner_functions     = NULL;
5559         current_trampolines = NULL;
5560
5561         if (entity->declaration.modifiers & DM_CONSTRUCTOR) {
5562                 ir_type *segment = get_segment_type(IR_SEGMENT_CONSTRUCTORS);
5563                 add_function_pointer(segment, function_entity, "constructor_ptr.%u");
5564         }
5565         if (entity->declaration.modifiers & DM_DESTRUCTOR) {
5566                 ir_type *segment = get_segment_type(IR_SEGMENT_DESTRUCTORS);
5567                 add_function_pointer(segment, function_entity, "destructor_ptr.%u");
5568         }
5569
5570         current_function_entity = entity;
5571         current_function_name   = NULL;
5572         current_funcsig         = NULL;
5573
5574         assert(all_labels == NULL);
5575         all_labels = NEW_ARR_F(label_t *, 0);
5576         ijmp_list  = NULL;
5577
5578         int       n_local_vars = get_function_n_local_vars(entity);
5579         ir_graph *irg          = new_ir_graph(function_entity, n_local_vars);
5580         current_ir_graph = irg;
5581
5582         ir_graph *old_current_function = current_function;
5583         current_function = irg;
5584
5585         ir_entity *const old_current_vararg_entity = current_vararg_entity;
5586         current_vararg_entity = NULL;
5587
5588         set_irg_fp_model(irg, firm_fp_model);
5589         tarval_enable_fp_ops(1);
5590         set_irn_dbg_info(get_irg_start_block(irg),
5591                          get_entity_dbg_info(function_entity));
5592
5593         /* set inline flags */
5594         if (entity->function.is_inline)
5595                 set_irg_inline_property(irg, irg_inline_recomended);
5596         handle_decl_modifier_irg(irg, entity->declaration.modifiers);
5597
5598         next_value_number_function = 0;
5599         initialize_function_parameters(entity);
5600         current_static_link = entity->function.static_link;
5601
5602         statement_to_firm(entity->function.statement);
5603
5604         ir_node *end_block = get_irg_end_block(irg);
5605
5606         /* do we have a return statement yet? */
5607         if (currently_reachable()) {
5608                 type_t *type = skip_typeref(entity->declaration.type);
5609                 assert(is_type_function(type));
5610                 const function_type_t *func_type   = &type->function;
5611                 const type_t          *return_type
5612                         = skip_typeref(func_type->return_type);
5613
5614                 ir_node *ret;
5615                 if (is_type_void(return_type)) {
5616                         ret = new_Return(get_store(), 0, NULL);
5617                 } else {
5618                         ir_mode *mode;
5619                         if (is_type_scalar(return_type)) {
5620                                 mode = get_ir_mode_storage(func_type->return_type);
5621                         } else {
5622                                 mode = mode_P_data;
5623                         }
5624
5625                         ir_node *in[1];
5626                         /* §5.1.2.2.3 main implicitly returns 0 */
5627                         if (is_main(entity)) {
5628                                 in[0] = new_Const(get_mode_null(mode));
5629                         } else {
5630                                 in[0] = new_Unknown(mode);
5631                         }
5632                         ret = new_Return(get_store(), 1, in);
5633                 }
5634                 add_immBlock_pred(end_block, ret);
5635         }
5636
5637         for (int i = ARR_LEN(all_labels) - 1; i >= 0; --i) {
5638                 label_t *label = all_labels[i];
5639                 if (label->address_taken) {
5640                         gen_ijmp_branches(label->block);
5641                 }
5642                 mature_immBlock(label->block);
5643         }
5644
5645         DEL_ARR_F(all_labels);
5646         all_labels = NULL;
5647
5648         irg_finalize_cons(irg);
5649
5650         /* finalize the frame type */
5651         ir_type *frame_type = get_irg_frame_type(irg);
5652         int      n          = get_compound_n_members(frame_type);
5653         int      align_all  = 4;
5654         int      offset     = 0;
5655         for (int i = 0; i < n; ++i) {
5656                 ir_entity *member      = get_compound_member(frame_type, i);
5657                 ir_type   *entity_type = get_entity_type(member);
5658
5659                 int align = get_type_alignment_bytes(entity_type);
5660                 if (align > align_all)
5661                         align_all = align;
5662                 int misalign = 0;
5663                 if (align > 0) {
5664                         misalign  = offset % align;
5665                         if (misalign > 0) {
5666                                 offset += align - misalign;
5667                         }
5668                 }
5669
5670                 set_entity_offset(member, offset);
5671                 offset += get_type_size_bytes(entity_type);
5672         }
5673         set_type_size_bytes(frame_type, offset);
5674         set_type_alignment_bytes(frame_type, align_all);
5675
5676         irg_verify(irg, VERIFY_ENFORCE_SSA);
5677         current_vararg_entity = old_current_vararg_entity;
5678         current_function      = old_current_function;
5679
5680         if (current_trampolines != NULL) {
5681                 DEL_ARR_F(current_trampolines);
5682                 current_trampolines = NULL;
5683         }
5684
5685         /* create inner functions if any */
5686         entity_t **inner = inner_functions;
5687         if (inner != NULL) {
5688                 ir_type *rem_outer_frame      = current_outer_frame;
5689                 current_outer_frame           = get_irg_frame_type(current_ir_graph);
5690                 for (int i = ARR_LEN(inner) - 1; i >= 0; --i) {
5691                         create_function(inner[i]);
5692                 }
5693                 DEL_ARR_F(inner);
5694
5695                 current_outer_frame      = rem_outer_frame;
5696         }
5697 }
5698
5699 static void scope_to_firm(scope_t *scope)
5700 {
5701         /* first pass: create declarations */
5702         entity_t *entity = scope->entities;
5703         for ( ; entity != NULL; entity = entity->base.next) {
5704                 if (entity->base.symbol == NULL)
5705                         continue;
5706
5707                 if (entity->kind == ENTITY_FUNCTION) {
5708                         if (entity->function.btk != BUILTIN_NONE) {
5709                                 /* builtins have no representation */
5710                                 continue;
5711                         }
5712                         (void)get_function_entity(entity, NULL);
5713                 } else if (entity->kind == ENTITY_VARIABLE) {
5714                         create_global_variable(entity);
5715                 } else if (entity->kind == ENTITY_NAMESPACE) {
5716                         scope_to_firm(&entity->namespacee.members);
5717                 }
5718         }
5719
5720         /* second pass: create code/initializers */
5721         entity = scope->entities;
5722         for ( ; entity != NULL; entity = entity->base.next) {
5723                 if (entity->base.symbol == NULL)
5724                         continue;
5725
5726                 if (entity->kind == ENTITY_FUNCTION) {
5727                         if (entity->function.btk != BUILTIN_NONE) {
5728                                 /* builtins have no representation */
5729                                 continue;
5730                         }
5731                         create_function(entity);
5732                 } else if (entity->kind == ENTITY_VARIABLE) {
5733                         assert(entity->declaration.kind
5734                                         == DECLARATION_KIND_GLOBAL_VARIABLE);
5735                         current_ir_graph = get_const_code_irg();
5736                         create_variable_initializer(entity);
5737                 }
5738         }
5739 }
5740
5741 void init_ast2firm(void)
5742 {
5743         obstack_init(&asm_obst);
5744         init_atomic_modes();
5745
5746         ir_set_debug_retrieve(dbg_retrieve);
5747         ir_set_type_debug_retrieve(dbg_print_type_dbg_info);
5748
5749         /* create idents for all known runtime functions */
5750         for (size_t i = 0; i < lengthof(rts_data); ++i) {
5751                 rts_idents[i] = new_id_from_str(rts_data[i].name);
5752         }
5753
5754         entitymap_init(&entitymap);
5755 }
5756
5757 static void init_ir_types(void)
5758 {
5759         static int ir_types_initialized = 0;
5760         if (ir_types_initialized)
5761                 return;
5762         ir_types_initialized = 1;
5763
5764         ir_type_char       = get_ir_type(type_char);
5765         ir_type_const_char = get_ir_type(type_const_char);
5766         ir_type_wchar_t    = get_ir_type(type_wchar_t);
5767
5768         be_params             = be_get_backend_param();
5769         mode_float_arithmetic = be_params->mode_float_arithmetic;
5770
5771         stack_param_align     = be_params->stack_param_align;
5772 }
5773
5774 void exit_ast2firm(void)
5775 {
5776         entitymap_destroy(&entitymap);
5777         obstack_free(&asm_obst, NULL);
5778 }
5779
5780 static void global_asm_to_firm(statement_t *s)
5781 {
5782         for (; s != NULL; s = s->base.next) {
5783                 assert(s->kind == STATEMENT_ASM);
5784
5785                 char const *const text = s->asms.asm_text.begin;
5786                 size_t            size = s->asms.asm_text.size;
5787
5788                 /* skip the last \0 */
5789                 if (text[size - 1] == '\0')
5790                         --size;
5791
5792                 ident *const id = new_id_from_chars(text, size);
5793                 add_irp_asm(id);
5794         }
5795 }
5796
5797 void translation_unit_to_firm(translation_unit_t *unit)
5798 {
5799         /* initialize firm arithmetic */
5800         tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
5801         ir_set_uninitialized_local_variable_func(uninitialized_local_var);
5802
5803         /* just to be sure */
5804         continue_label           = NULL;
5805         break_label              = NULL;
5806         current_switch           = NULL;
5807         current_translation_unit = unit;
5808
5809         init_ir_types();
5810
5811         scope_to_firm(&unit->scope);
5812         global_asm_to_firm(unit->global_asm);
5813
5814         current_ir_graph         = NULL;
5815         current_translation_unit = NULL;
5816 }