nsz Git - cparser/blob - ast2firm.c

   1 /*
   2  * This file is part of cparser.
   3  * Copyright (C) 2007-2009 Matthias Braun <matze@braunis.de>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  18  * 02111-1307, USA.
  19  */
  20 #include <config.h>
  21
  22 #include <assert.h>
  23 #include <string.h>
  24 #include <stdbool.h>
  25 #include <unistd.h>
  26 #include <limits.h>
  27
  28 #include <libfirm/firm.h>
  29 #include <libfirm/adt/obst.h>
  30 #include <libfirm/be.h>
  31
  32 #include "ast2firm.h"
  33
  34 #include "adt/error.h"
  35 #include "adt/array.h"
  36 #include "adt/strutil.h"
  37 #include "adt/util.h"
  38 #include "symbol_t.h"
  39 #include "token_t.h"
  40 #include "type_t.h"
  41 #include "ast_t.h"
  42 #include "entity_t.h"
  43 #include "parser.h"
  44 #include "diagnostic.h"
  45 #include "lang_features.h"
  46 #include "types.h"
  47 #include "type_hash.h"
  48 #include "mangle.h"
  49 #include "walk.h"
  50 #include "warning.h"
  51 #include "printer.h"
  52 #include "entitymap_t.h"
  53 #include "driver/firm_opt.h"
  54
  55 typedef struct trampoline_region trampoline_region;
  56 struct trampoline_region {
  57         ir_entity        *function;    /**< The function that is called by this trampoline */
  58         ir_entity        *region;      /**< created region for the trampoline */
  59 };
  60
  61 fp_model_t firm_fp_model = fp_model_precise;
  62
  63 static const backend_params *be_params;
  64
  65 static ir_type *ir_type_char;
  66 static ir_type *ir_type_const_char;
  67 static ir_type *ir_type_wchar_t;
  68
  69 /* architecture specific floating point arithmetic mode (if any) */
  70 static ir_mode *mode_float_arithmetic;
  71
  72 /* alignment of stack parameters */
  73 static unsigned stack_param_align;
  74
  75 static int        next_value_number_function;
  76 static ir_node   *continue_label;
  77 static ir_node   *break_label;
  78 static ir_node   *current_switch;
  79 static bool       saw_default_label;
  80 static label_t  **all_labels;
  81 static entity_t **inner_functions;
  82 static ir_node   *ijmp_list;
  83 static bool       constant_folding;
  84
  85 static const entity_t     *current_function_entity;
  86 static ir_node            *current_function_name;
  87 static ir_node            *current_funcsig;
  88 static ir_graph           *current_function;
  89 static translation_unit_t *current_translation_unit;
  90 static trampoline_region  *current_trampolines;
  91 static ir_type            *current_outer_frame;
  92 static ir_node            *current_static_link;
  93 static ir_entity          *current_vararg_entity;
  94
  95 static entitymap_t  entitymap;
  96
  97 static struct obstack asm_obst;
  98
  99 typedef enum declaration_kind_t {
 100         DECLARATION_KIND_UNKNOWN,
 101         DECLARATION_KIND_VARIABLE_LENGTH_ARRAY,
 102         DECLARATION_KIND_GLOBAL_VARIABLE,
 103         DECLARATION_KIND_LOCAL_VARIABLE,
 104         DECLARATION_KIND_LOCAL_VARIABLE_ENTITY,
 105         DECLARATION_KIND_PARAMETER,
 106         DECLARATION_KIND_PARAMETER_ENTITY,
 107         DECLARATION_KIND_FUNCTION,
 108         DECLARATION_KIND_COMPOUND_MEMBER,
 109         DECLARATION_KIND_INNER_FUNCTION
 110 } declaration_kind_t;
 111
 112 static ir_type *get_ir_type_incomplete(type_t *type);
 113
 114 static void enqueue_inner_function(entity_t *entity)
 115 {
 116         if (inner_functions == NULL)
 117                 inner_functions = NEW_ARR_F(entity_t *, 0);
 118         ARR_APP1(entity_t*, inner_functions, entity);
 119 }
 120
 121 static ir_node *uninitialized_local_var(ir_graph *irg, ir_mode *mode, int pos)
 122 {
 123         const entity_t *entity = get_irg_loc_description(irg, pos);
 124
 125         if (entity != NULL) {
 126                 source_position_t const *const pos = &entity->base.source_position;
 127                 warningf(WARN_UNINITIALIZED, pos, "'%N' might be used uninitialized", entity);
 128         }
 129         return new_r_Unknown(irg, mode);
 130 }
 131
 132 static src_loc_t dbg_retrieve(const dbg_info *dbg)
 133 {
 134         source_position_t const *const pos = (source_position_t const*)dbg;
 135         if (pos) {
 136                 return (src_loc_t){ pos->input_name, pos->lineno, pos->colno };
 137         } else {
 138                 return (src_loc_t){ NULL, 0, 0 };
 139         }
 140 }
 141
 142 static dbg_info *get_dbg_info(const source_position_t *pos)
 143 {
 144         return (dbg_info*) pos;
 145 }
 146
 147 static void dbg_print_type_dbg_info(char *buffer, size_t buffer_size,
 148                                     const type_dbg_info *dbg)
 149 {
 150         assert(dbg != NULL);
 151         print_to_buffer(buffer, buffer_size);
 152         const type_t *type = (const type_t*) dbg;
 153         print_type(type);
 154         finish_print_to_buffer();
 155 }
 156
 157 static type_dbg_info *get_type_dbg_info_(const type_t *type)
 158 {
 159         return (type_dbg_info*) type;
 160 }
 161
 162 /* is the current block a reachable one? */
 163 static bool currently_reachable(void)
 164 {
 165         ir_node *const block = get_cur_block();
 166         return block != NULL && !is_Bad(block);
 167 }
 168
 169 static void set_unreachable_now(void)
 170 {
 171         set_cur_block(NULL);
 172 }
 173
 174 ir_mode *atomic_modes[ATOMIC_TYPE_LAST+1];
 175
 176 static ir_node *_expression_to_firm(const expression_t *expression);
 177 static ir_node *expression_to_firm(const expression_t *expression);
 178 static void create_local_declaration(entity_t *entity);
 179
 180 static unsigned decide_modulo_shift(unsigned type_size)
 181 {
 182         if (architecture_modulo_shift == 0)
 183                 return 0;
 184         if (type_size < architecture_modulo_shift)
 185                 return architecture_modulo_shift;
 186         return type_size;
 187 }
 188
 189 static ir_mode *init_atomic_ir_mode(atomic_type_kind_t kind)
 190 {
 191         unsigned flags = get_atomic_type_flags(kind);
 192         unsigned size  = get_atomic_type_size(kind);
 193         if ((flags & ATOMIC_TYPE_FLAG_FLOAT)
 194             && !(flags & ATOMIC_TYPE_FLAG_COMPLEX)) {
 195                 if (size == 4) {
 196                         return get_modeF();
 197                 } else if (size == 8) {
 198                         return get_modeD();
 199                 } else {
 200                         panic("unexpected kind");
 201                 }
 202         } else if (flags & ATOMIC_TYPE_FLAG_INTEGER) {
 203                 char            name[64];
 204                 unsigned        bit_size     = size * 8;
 205                 bool            is_signed    = (flags & ATOMIC_TYPE_FLAG_SIGNED) != 0;
 206                 unsigned        modulo_shift = decide_modulo_shift(bit_size);
 207
 208                 snprintf(name, sizeof(name), "%s%u", is_signed ? "I" : "U", bit_size);
 209                 return new_int_mode(name, irma_twos_complement, bit_size, is_signed,
 210                                     modulo_shift);
 211         }
 212
 213         return NULL;
 214 }
 215
 216 /**
 217  * Initialises the atomic modes depending on the machine size.
 218  */
 219 static void init_atomic_modes(void)
 220 {
 221         atomic_modes[ATOMIC_TYPE_VOID] = mode_ANY;
 222         for (int i = 0; i <= ATOMIC_TYPE_LAST; ++i) {
 223                 if (atomic_modes[i] != NULL)
 224                         continue;
 225                 atomic_modes[i] = init_atomic_ir_mode((atomic_type_kind_t) i);
 226         }
 227 }
 228
 229 ir_mode *get_atomic_mode(atomic_type_kind_t kind)
 230 {
 231         assert(kind <= ATOMIC_TYPE_LAST);
 232         return atomic_modes[kind];
 233 }
 234
 235 static ir_node *get_vla_size(array_type_t *const type)
 236 {
 237         ir_node *size_node = type->size_node;
 238         if (size_node == NULL) {
 239                 size_node = expression_to_firm(type->size_expression);
 240                 type->size_node = size_node;
 241         }
 242         return size_node;
 243 }
 244
 245 static unsigned count_parameters(const function_type_t *function_type)
 246 {
 247         unsigned count = 0;
 248
 249         function_parameter_t *parameter = function_type->parameters;
 250         for ( ; parameter != NULL; parameter = parameter->next) {
 251                 ++count;
 252         }
 253
 254         return count;
 255 }
 256
 257 /**
 258  * Creates a Firm type for an atomic type
 259  */
 260 static ir_type *create_atomic_type(atomic_type_kind_t akind, const type_t *type)
 261 {
 262         ir_mode        *mode      = atomic_modes[akind];
 263         type_dbg_info  *dbgi      = get_type_dbg_info_(type);
 264         ir_type        *irtype    = new_d_type_primitive(mode, dbgi);
 265         il_alignment_t  alignment = get_atomic_type_alignment(akind);
 266
 267         set_type_size_bytes(irtype, get_atomic_type_size(akind));
 268         set_type_alignment_bytes(irtype, alignment);
 269
 270         return irtype;
 271 }
 272
 273 /**
 274  * Creates a Firm type for a complex type
 275  */
 276 static ir_type *create_complex_type(const atomic_type_t *type)
 277 {
 278         atomic_type_kind_t  kind = type->akind;
 279         ir_mode            *mode = atomic_modes[kind];
 280         ident              *id   = get_mode_ident(mode);
 281
 282         (void) id;
 283
 284         /* FIXME: finish the array */
 285         return NULL;
 286 }
 287
 288 /**
 289  * Creates a Firm type for an imaginary type
 290  */
 291 static ir_type *create_imaginary_type(const atomic_type_t *type)
 292 {
 293         return create_atomic_type(type->akind, (const type_t*)type);
 294 }
 295
 296 /**
 297  * return type of a parameter (and take transparent union gnu extension into
 298  * account)
 299  */
 300 static type_t *get_parameter_type(type_t *orig_type)
 301 {
 302         type_t *type = skip_typeref(orig_type);
 303         if (is_type_union(type)
 304                         && get_type_modifiers(orig_type) & DM_TRANSPARENT_UNION) {
 305                 compound_t *compound = type->compound.compound;
 306                 type                 = compound->members.entities->declaration.type;
 307         }
 308
 309         return type;
 310 }
 311
 312 static ir_type *create_method_type(const function_type_t *function_type, bool for_closure)
 313 {
 314         type_t        *return_type  = skip_typeref(function_type->return_type);
 315
 316         int            n_parameters = count_parameters(function_type)
 317                                        + (for_closure ? 1 : 0);
 318         int            n_results    = is_type_void(return_type) ? 0 : 1;
 319         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) function_type);
 320         ir_type       *irtype       = new_d_type_method(n_parameters, n_results, dbgi);
 321
 322         if (!is_type_void(return_type)) {
 323                 ir_type *restype = get_ir_type(return_type);
 324                 set_method_res_type(irtype, 0, restype);
 325         }
 326
 327         function_parameter_t *parameter = function_type->parameters;
 328         int                   n         = 0;
 329         if (for_closure) {
 330                 ir_type *p_irtype = get_ir_type(type_void_ptr);
 331                 set_method_param_type(irtype, n, p_irtype);
 332                 ++n;
 333         }
 334         for ( ; parameter != NULL; parameter = parameter->next) {
 335                 type_t  *type     = get_parameter_type(parameter->type);
 336                 ir_type *p_irtype = get_ir_type(type);
 337                 set_method_param_type(irtype, n, p_irtype);
 338                 ++n;
 339         }
 340
 341         bool is_variadic = function_type->variadic;
 342
 343         if (is_variadic)
 344                 set_method_variadicity(irtype, variadicity_variadic);
 345
 346         unsigned cc = get_method_calling_convention(irtype);
 347         switch (function_type->calling_convention) {
 348         case CC_DEFAULT: /* unspecified calling convention, equal to one of the other, typically cdecl */
 349         case CC_CDECL:
 350 is_cdecl:
 351                 set_method_calling_convention(irtype, SET_CDECL(cc));
 352                 break;
 353
 354         case CC_STDCALL:
 355                 if (is_variadic)
 356                         goto is_cdecl;
 357
 358                 /* only non-variadic function can use stdcall, else use cdecl */
 359                 set_method_calling_convention(irtype, SET_STDCALL(cc));
 360                 break;
 361
 362         case CC_FASTCALL:
 363                 if (is_variadic)
 364                         goto is_cdecl;
 365                 /* only non-variadic function can use fastcall, else use cdecl */
 366                 set_method_calling_convention(irtype, SET_FASTCALL(cc));
 367                 break;
 368
 369         case CC_THISCALL:
 370                 /* Hmm, leave default, not accepted by the parser yet. */
 371                 break;
 372         }
 373
 374         if (for_closure)
 375                 set_method_calling_convention(irtype, get_method_calling_convention(irtype) | cc_this_call);
 376
 377         const decl_modifiers_t modifiers = function_type->modifiers;
 378         if (modifiers & DM_CONST)
 379                 add_method_additional_properties(irtype, mtp_property_const);
 380         if (modifiers & DM_PURE)
 381                 add_method_additional_properties(irtype, mtp_property_pure);
 382         if (modifiers & DM_RETURNS_TWICE)
 383                 add_method_additional_properties(irtype, mtp_property_returns_twice);
 384         if (modifiers & DM_NORETURN)
 385                 add_method_additional_properties(irtype, mtp_property_noreturn);
 386         if (modifiers & DM_NOTHROW)
 387                 add_method_additional_properties(irtype, mtp_property_nothrow);
 388         if (modifiers & DM_MALLOC)
 389                 add_method_additional_properties(irtype, mtp_property_malloc);
 390
 391         return irtype;
 392 }
 393
 394 static ir_type *create_pointer_type(pointer_type_t *type)
 395 {
 396         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) type);
 397         type_t        *points_to    = type->points_to;
 398         ir_type       *ir_points_to = get_ir_type_incomplete(points_to);
 399         ir_type       *irtype       = new_d_type_pointer(ir_points_to, dbgi);
 400
 401         return irtype;
 402 }
 403
 404 static ir_type *create_reference_type(reference_type_t *type)
 405 {
 406         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) type);
 407         type_t        *refers_to    = type->refers_to;
 408         ir_type       *ir_refers_to = get_ir_type_incomplete(refers_to);
 409         ir_type       *irtype       = new_d_type_pointer(ir_refers_to, dbgi);
 410
 411         return irtype;
 412 }
 413
 414 static ir_type *create_array_type(array_type_t *type)
 415 {
 416         type_dbg_info *dbgi            = get_type_dbg_info_((const type_t*) type);
 417         type_t        *element_type    = type->element_type;
 418         ir_type       *ir_element_type = get_ir_type(element_type);
 419         ir_type       *irtype          = new_d_type_array(1, ir_element_type, dbgi);
 420
 421         const int align = get_type_alignment_bytes(ir_element_type);
 422         set_type_alignment_bytes(irtype, align);
 423
 424         if (type->size_constant) {
 425                 int n_elements = type->size;
 426
 427                 set_array_bounds_int(irtype, 0, 0, n_elements);
 428
 429                 size_t elemsize = get_type_size_bytes(ir_element_type);
 430                 if (elemsize % align > 0) {
 431                         elemsize += align - (elemsize % align);
 432                 }
 433                 set_type_size_bytes(irtype, n_elements * elemsize);
 434         } else {
 435                 set_array_lower_bound_int(irtype, 0, 0);
 436         }
 437         set_type_state(irtype, layout_fixed);
 438
 439         return irtype;
 440 }
 441
 442 /**
 443  * Return the signed integer type of size bits.
 444  *
 445  * @param size   the size
 446  */
 447 static ir_type *get_signed_int_type_for_bit_size(ir_type *base_tp,
 448                                                  unsigned size,
 449                                                                                                  const type_t *type)
 450 {
 451         static ir_mode *s_modes[64 + 1] = {NULL, };
 452         ir_type *res;
 453         ir_mode *mode;
 454
 455         if (size <= 0 || size > 64)
 456                 return NULL;
 457
 458         mode = s_modes[size];
 459         if (mode == NULL) {
 460                 char name[32];
 461
 462                 snprintf(name, sizeof(name), "bf_I%u", size);
 463                 mode = new_int_mode(name, irma_twos_complement, size, 1, 0);
 464                 s_modes[size] = mode;
 465         }
 466
 467         type_dbg_info *dbgi = get_type_dbg_info_(type);
 468         res                 = new_d_type_primitive(mode, dbgi);
 469         set_primitive_base_type(res, base_tp);
 470
 471         return res;
 472 }
 473
 474 /**
 475  * Return the unsigned integer type of size bits.
 476  *
 477  * @param size   the size
 478  */
 479 static ir_type *get_unsigned_int_type_for_bit_size(ir_type *base_tp,
 480                                                    unsigned size,
 481                                                                                                    const type_t *type)
 482 {
 483         static ir_mode *u_modes[64 + 1] = {NULL, };
 484         ir_type *res;
 485         ir_mode *mode;
 486
 487         if (size <= 0 || size > 64)
 488                 return NULL;
 489
 490         mode = u_modes[size];
 491         if (mode == NULL) {
 492                 char name[32];
 493
 494                 snprintf(name, sizeof(name), "bf_U%u", size);
 495                 mode = new_int_mode(name, irma_twos_complement, size, 0, 0);
 496                 u_modes[size] = mode;
 497         }
 498
 499         type_dbg_info *dbgi = get_type_dbg_info_(type);
 500         res = new_d_type_primitive(mode, dbgi);
 501         set_primitive_base_type(res, base_tp);
 502
 503         return res;
 504 }
 505
 506 static ir_type *create_bitfield_type(const entity_t *entity)
 507 {
 508         assert(entity->kind == ENTITY_COMPOUND_MEMBER);
 509         type_t *base = skip_typeref(entity->declaration.type);
 510         assert(base->kind == TYPE_ATOMIC || base->kind == TYPE_ENUM);
 511         ir_type *irbase = get_ir_type(base);
 512
 513         unsigned bit_size = entity->compound_member.bit_size;
 514
 515         assert(!is_type_float(base));
 516         if (is_type_signed(base)) {
 517                 return get_signed_int_type_for_bit_size(irbase, bit_size, base);
 518         } else {
 519                 return get_unsigned_int_type_for_bit_size(irbase, bit_size, base);
 520         }
 521 }
 522
 523 enum {
 524         COMPOUND_IS_STRUCT = false,
 525         COMPOUND_IS_UNION  = true
 526 };
 527
 528 /**
 529  * Construct firm type from ast struct type.
 530  */
 531 static ir_type *create_compound_type(compound_type_t *type,
 532                                      bool incomplete, bool is_union)
 533 {
 534         compound_t *compound = type->compound;
 535
 536         if (compound->irtype != NULL && (compound->irtype_complete || incomplete)) {
 537                 return compound->irtype;
 538         }
 539
 540         symbol_t *type_symbol = compound->base.symbol;
 541         ident    *id;
 542         if (type_symbol != NULL) {
 543                 id = new_id_from_str(type_symbol->string);
 544         } else {
 545                 if (is_union) {
 546                         id = id_unique("__anonymous_union.%u");
 547                 } else {
 548                         id = id_unique("__anonymous_struct.%u");
 549                 }
 550         }
 551
 552         ir_type *irtype;
 553         if (is_union) {
 554                 irtype = new_type_union(id);
 555         } else {
 556                 irtype = new_type_struct(id);
 557         }
 558
 559         compound->irtype_complete = false;
 560         compound->irtype          = irtype;
 561
 562         if (incomplete)
 563                 return irtype;
 564
 565         if (is_union) {
 566                 layout_union_type(type);
 567         } else {
 568                 layout_struct_type(type);
 569         }
 570
 571         compound->irtype_complete = true;
 572
 573         entity_t *entry = compound->members.entities;
 574         for ( ; entry != NULL; entry = entry->base.next) {
 575                 if (entry->kind != ENTITY_COMPOUND_MEMBER)
 576                         continue;
 577
 578                 symbol_t *symbol     = entry->base.symbol;
 579                 type_t   *entry_type = entry->declaration.type;
 580                 ident    *ident;
 581                 if (symbol == NULL) {
 582                         /* anonymous bitfield member, skip */
 583                         if (entry->compound_member.bitfield)
 584                                 continue;
 585                         assert(entry_type->kind == TYPE_COMPOUND_STRUCT
 586                                         || entry_type->kind == TYPE_COMPOUND_UNION);
 587                         ident = id_unique("anon.%u");
 588                 } else {
 589                         ident = new_id_from_str(symbol->string);
 590                 }
 591
 592                 dbg_info *dbgi       = get_dbg_info(&entry->base.source_position);
 593
 594                 ir_type *entry_irtype;
 595                 if (entry->compound_member.bitfield) {
 596                         entry_irtype = create_bitfield_type(entry);
 597                 } else {
 598                         entry_irtype = get_ir_type(entry_type);
 599                 }
 600                 ir_entity *entity = new_d_entity(irtype, ident, entry_irtype, dbgi);
 601
 602                 set_entity_offset(entity, entry->compound_member.offset);
 603                 set_entity_offset_bits_remainder(entity,
 604                                                  entry->compound_member.bit_offset);
 605
 606                 assert(entry->declaration.kind == DECLARATION_KIND_UNKNOWN);
 607                 entry->declaration.kind       = DECLARATION_KIND_COMPOUND_MEMBER;
 608                 entry->compound_member.entity = entity;
 609         }
 610
 611         set_type_alignment_bytes(irtype, compound->alignment);
 612         set_type_size_bytes(irtype, compound->size);
 613         set_type_state(irtype, layout_fixed);
 614
 615         return irtype;
 616 }
 617
 618 static ir_tarval *fold_constant_to_tarval(expression_t const *);
 619
 620 static void determine_enum_values(enum_type_t *const type)
 621 {
 622         ir_mode   *const mode    = atomic_modes[type->base.akind];
 623         ir_tarval *const one     = get_mode_one(mode);
 624         ir_tarval *      tv_next = get_mode_null(mode);
 625
 626         enum_t   *enume = type->enume;
 627         entity_t *entry = enume->base.next;
 628         for (; entry != NULL; entry = entry->base.next) {
 629                 if (entry->kind != ENTITY_ENUM_VALUE)
 630                         break;
 631
 632                 expression_t *const init = entry->enum_value.value;
 633                 if (init != NULL) {
 634                         tv_next = fold_constant_to_tarval(init);
 635                 }
 636                 assert(entry->enum_value.tv == NULL || entry->enum_value.tv == tv_next);
 637                 entry->enum_value.tv = tv_next;
 638                 tv_next = tarval_add(tv_next, one);
 639         }
 640 }
 641
 642 static ir_type *create_enum_type(enum_type_t *const type)
 643 {
 644         return create_atomic_type(type->base.akind, (const type_t*) type);
 645 }
 646
 647 static ir_type *get_ir_type_incomplete(type_t *type)
 648 {
 649         assert(type != NULL);
 650         type = skip_typeref(type);
 651
 652         if (type->base.firm_type != NULL) {
 653                 return type->base.firm_type;
 654         }
 655
 656         switch (type->kind) {
 657         case TYPE_COMPOUND_STRUCT:
 658                 return create_compound_type(&type->compound, true, COMPOUND_IS_STRUCT);
 659         case TYPE_COMPOUND_UNION:
 660                 return create_compound_type(&type->compound, true, COMPOUND_IS_UNION);
 661         default:
 662                 return get_ir_type(type);
 663         }
 664 }
 665
 666 ir_type *get_ir_type(type_t *type)
 667 {
 668         assert(type != NULL);
 669
 670         type = skip_typeref(type);
 671
 672         if (type->base.firm_type != NULL) {
 673                 return type->base.firm_type;
 674         }
 675
 676         ir_type *firm_type = NULL;
 677         switch (type->kind) {
 678         case TYPE_ATOMIC:
 679                 firm_type = create_atomic_type(type->atomic.akind, type);
 680                 break;
 681         case TYPE_COMPLEX:
 682                 firm_type = create_complex_type(&type->atomic);
 683                 break;
 684         case TYPE_IMAGINARY:
 685                 firm_type = create_imaginary_type(&type->atomic);
 686                 break;
 687         case TYPE_FUNCTION:
 688                 firm_type = create_method_type(&type->function, false);
 689                 break;
 690         case TYPE_POINTER:
 691                 firm_type = create_pointer_type(&type->pointer);
 692                 break;
 693         case TYPE_REFERENCE:
 694                 firm_type = create_reference_type(&type->reference);
 695                 break;
 696         case TYPE_ARRAY:
 697                 firm_type = create_array_type(&type->array);
 698                 break;
 699         case TYPE_COMPOUND_STRUCT:
 700                 firm_type = create_compound_type(&type->compound, false, COMPOUND_IS_STRUCT);
 701                 break;
 702         case TYPE_COMPOUND_UNION:
 703                 firm_type = create_compound_type(&type->compound, false, COMPOUND_IS_UNION);
 704                 break;
 705         case TYPE_ENUM:
 706                 firm_type = create_enum_type(&type->enumt);
 707                 break;
 708
 709         case TYPE_ERROR:
 710         case TYPE_TYPEOF:
 711         case TYPE_TYPEDEF:
 712                 break;
 713         }
 714         if (firm_type == NULL)
 715                 panic("unknown type found");
 716
 717         type->base.firm_type = firm_type;
 718         return firm_type;
 719 }
 720
 721 static ir_mode *get_ir_mode_storage(type_t *type)
 722 {
 723         ir_type *irtype = get_ir_type(type);
 724
 725         /* firm doesn't report a mode for arrays somehow... */
 726         if (is_Array_type(irtype)) {
 727                 return mode_P_data;
 728         }
 729
 730         ir_mode *mode = get_type_mode(irtype);
 731         assert(mode != NULL);
 732         return mode;
 733 }
 734
 735 /*
 736  * get arithmetic mode for a type. This is different from get_ir_mode_storage,
 737  * int that it returns bigger modes for floating point on some platforms
 738  * (x87 internally does arithemtic with 80bits)
 739  */
 740 static ir_mode *get_ir_mode_arithmetic(type_t *type)
 741 {
 742         ir_mode *mode = get_ir_mode_storage(type);
 743         if (mode_is_float(mode) && mode_float_arithmetic != NULL) {
 744                 return mode_float_arithmetic;
 745         }
 746
 747         return mode;
 748 }
 749
 750 /**
 751  * Return a node representing the size of a type.
 752  */
 753 static ir_node *get_type_size_node(type_t *type)
 754 {
 755         unsigned size;
 756         ir_mode *mode = get_ir_mode_arithmetic(type_size_t);
 757         type = skip_typeref(type);
 758
 759         if (is_type_array(type) && type->array.is_vla) {
 760                 ir_node *size_node = get_vla_size(&type->array);
 761                 ir_node *elem_size = get_type_size_node(type->array.element_type);
 762                 ir_node *real_size = new_d_Mul(NULL, size_node, elem_size, mode);
 763                 return real_size;
 764         }
 765
 766         size = get_type_size(type);
 767         return new_Const_long(mode, size);
 768 }
 769
 770 /** Names of the runtime functions. */
 771 static const struct {
 772         int        id;           /**< the rts id */
 773         int        n_res;        /**< number of return values */
 774         const char *name;        /**< the name of the rts function */
 775         int        n_params;     /**< number of parameters */
 776         unsigned   flags;        /**< language flags */
 777 } rts_data[] = {
 778         { rts_debugbreak, 0, "__debugbreak", 0, _MS },
 779         { rts_abort,      0, "abort",        0, _C89 },
 780         { rts_alloca,     1, "alloca",       1, _ALL },
 781         { rts_abs,        1, "abs",          1, _C89 },
 782         { rts_labs,       1, "labs",         1, _C89 },
 783         { rts_llabs,      1, "llabs",        1, _C99 },
 784         { rts_imaxabs,    1, "imaxabs",      1, _C99 },
 785
 786         { rts_fabs,       1, "fabs",         1, _C89 },
 787         { rts_sqrt,       1, "sqrt",         1, _C89 },
 788         { rts_cbrt,       1, "cbrt",         1, _C99 },
 789         { rts_exp,        1, "exp",          1, _C89 },
 790         { rts_exp2,       1, "exp2",         1, _C89 },
 791         { rts_exp10,      1, "exp10",        1, _GNUC },
 792         { rts_log,        1, "log",          1, _C89 },
 793         { rts_log2,       1, "log2",         1, _C89 },
 794         { rts_log10,      1, "log10",        1, _C89 },
 795         { rts_pow,        1, "pow",          2, _C89 },
 796         { rts_sin,        1, "sin",          1, _C89 },
 797         { rts_cos,        1, "cos",          1, _C89 },
 798         { rts_tan,        1, "tan",          1, _C89 },
 799         { rts_asin,       1, "asin",         1, _C89 },
 800         { rts_acos,       1, "acos",         1, _C89 },
 801         { rts_atan,       1, "atan",         1, _C89 },
 802         { rts_sinh,       1, "sinh",         1, _C89 },
 803         { rts_cosh,       1, "cosh",         1, _C89 },
 804         { rts_tanh,       1, "tanh",         1, _C89 },
 805
 806         { rts_fabsf,      1, "fabsf",        1, _C99 },
 807         { rts_sqrtf,      1, "sqrtf",        1, _C99 },
 808         { rts_cbrtf,      1, "cbrtf",        1, _C99 },
 809         { rts_expf,       1, "expf",         1, _C99 },
 810         { rts_exp2f,      1, "exp2f",        1, _C99 },
 811         { rts_exp10f,     1, "exp10f",       1, _GNUC },
 812         { rts_logf,       1, "logf",         1, _C99 },
 813         { rts_log2f,      1, "log2f",        1, _C99 },
 814         { rts_log10f,     1, "log10f",       1, _C99 },
 815         { rts_powf,       1, "powf",         2, _C99 },
 816         { rts_sinf,       1, "sinf",         1, _C99 },
 817         { rts_cosf,       1, "cosf",         1, _C99 },
 818         { rts_tanf,       1, "tanf",         1, _C99 },
 819         { rts_asinf,      1, "asinf",        1, _C99 },
 820         { rts_acosf,      1, "acosf",        1, _C99 },
 821         { rts_atanf,      1, "atanf",        1, _C99 },
 822         { rts_sinhf,      1, "sinhf",        1, _C99 },
 823         { rts_coshf,      1, "coshf",        1, _C99 },
 824         { rts_tanhf,      1, "tanhf",        1, _C99 },
 825
 826         { rts_fabsl,      1, "fabsl",        1, _C99 },
 827         { rts_sqrtl,      1, "sqrtl",        1, _C99 },
 828         { rts_cbrtl,      1, "cbrtl",        1, _C99 },
 829         { rts_expl,       1, "expl",         1, _C99 },
 830         { rts_exp2l,      1, "exp2l",        1, _C99 },
 831         { rts_exp10l,     1, "exp10l",       1, _GNUC },
 832         { rts_logl,       1, "logl",         1, _C99 },
 833         { rts_log2l,      1, "log2l",        1, _C99 },
 834         { rts_log10l,     1, "log10l",       1, _C99 },
 835         { rts_powl,       1, "powl",         2, _C99 },
 836         { rts_sinl,       1, "sinl",         1, _C99 },
 837         { rts_cosl,       1, "cosl",         1, _C99 },
 838         { rts_tanl,       1, "tanl",         1, _C99 },
 839         { rts_asinl,      1, "asinl",        1, _C99 },
 840         { rts_acosl,      1, "acosl",        1, _C99 },
 841         { rts_atanl,      1, "atanl",        1, _C99 },
 842         { rts_sinhl,      1, "sinhl",        1, _C99 },
 843         { rts_coshl,      1, "coshl",        1, _C99 },
 844         { rts_tanhl,      1, "tanhl",        1, _C99 },
 845
 846         { rts_strcmp,     1, "strcmp",       2, _C89 },
 847         { rts_strncmp,    1, "strncmp",      3, _C89 },
 848         { rts_strcpy,     1, "strcpy",       2, _C89 },
 849         { rts_strlen,     1, "strlen",       1, _C89 },
 850         { rts_memcpy,     1, "memcpy",       3, _C89 },
 851         { rts_mempcpy,    1, "mempcpy",      3, _GNUC },
 852         { rts_memmove,    1, "memmove",      3, _C89 },
 853         { rts_memset,     1, "memset",       3, _C89 },
 854         { rts_memcmp,     1, "memcmp",       3, _C89 },
 855 };
 856
 857 static ident *rts_idents[lengthof(rts_data)];
 858
 859 static create_ld_ident_func create_ld_ident = create_name_linux_elf;
 860
 861 void set_create_ld_ident(ident *(*func)(entity_t*))
 862 {
 863         create_ld_ident = func;
 864 }
 865
 866 /**
 867  * Handle GNU attributes for entities
 868  *
 869  * @param ent   the entity
 870  * @param decl  the routine declaration
 871  */
 872 static void handle_decl_modifiers(ir_entity *irentity, entity_t *entity)
 873 {
 874         assert(is_declaration(entity));
 875         decl_modifiers_t modifiers = entity->declaration.modifiers;
 876
 877         if (is_method_entity(irentity)) {
 878                 if (modifiers & DM_PURE) {
 879                         set_entity_additional_properties(irentity, mtp_property_pure);
 880                 }
 881                 if (modifiers & DM_CONST) {
 882                         add_entity_additional_properties(irentity, mtp_property_const);
 883                 }
 884         }
 885         if (modifiers & DM_USED) {
 886                 add_entity_linkage(irentity, IR_LINKAGE_HIDDEN_USER);
 887         }
 888         if (modifiers & DM_WEAK) {
 889                 add_entity_linkage(irentity, IR_LINKAGE_WEAK);
 890         }
 891 }
 892
 893 static bool is_main(entity_t *entity)
 894 {
 895         static symbol_t *sym_main = NULL;
 896         if (sym_main == NULL) {
 897                 sym_main = symbol_table_insert("main");
 898         }
 899
 900         if (entity->base.symbol != sym_main)
 901                 return false;
 902         /* must be in outermost scope */
 903         if (entity->base.parent_scope != &current_translation_unit->scope)
 904                 return false;
 905
 906         return true;
 907 }
 908
 909 /**
 910  * Creates an entity representing a function.
 911  *
 912  * @param entity       the function declaration/definition
 913  * @param owner_type   the owner type of this function, NULL
 914  *                     for global functions
 915  */
 916 static ir_entity *get_function_entity(entity_t *entity, ir_type *owner_type)
 917 {
 918         assert(entity->kind == ENTITY_FUNCTION);
 919         if (entity->function.irentity != NULL)
 920                 return entity->function.irentity;
 921
 922         switch (entity->function.btk) {
 923         case BUILTIN_NONE:
 924         case BUILTIN_LIBC:
 925         case BUILTIN_LIBC_CHECK:
 926                 break;
 927         default:
 928                 return NULL;
 929         }
 930
 931         if (is_main(entity)) {
 932                 /* force main to C linkage */
 933                 type_t *type = entity->declaration.type;
 934                 assert(is_type_function(type));
 935                 if (type->function.linkage != LINKAGE_C) {
 936                         type_t *new_type           = duplicate_type(type);
 937                         new_type->function.linkage = LINKAGE_C;
 938                         type                       = identify_new_type(new_type);
 939                         entity->declaration.type   = type;
 940                 }
 941         }
 942
 943         symbol_t *symbol = entity->base.symbol;
 944         ident    *id     = new_id_from_str(symbol->string);
 945
 946         /* already an entity defined? */
 947         ir_entity *irentity = entitymap_get(&entitymap, symbol);
 948         bool const has_body = entity->function.statement != NULL;
 949         if (irentity != NULL) {
 950                 if (get_entity_visibility(irentity) == ir_visibility_external
 951                                 && has_body) {
 952                         set_entity_visibility(irentity, ir_visibility_default);
 953                 }
 954                 goto entity_created;
 955         }
 956
 957         ir_type *ir_type_method;
 958         if (entity->function.need_closure)
 959                 ir_type_method = create_method_type(&entity->declaration.type->function, true);
 960         else
 961                 ir_type_method = get_ir_type(entity->declaration.type);
 962
 963         bool nested_function = false;
 964         if (owner_type == NULL)
 965                 owner_type = get_glob_type();
 966         else
 967                 nested_function = true;
 968
 969         dbg_info *const dbgi = get_dbg_info(&entity->base.source_position);
 970         irentity = new_d_entity(owner_type, id, ir_type_method, dbgi);
 971
 972         ident *ld_id;
 973         if (nested_function)
 974                 ld_id = id_unique("inner.%u");
 975         else
 976                 ld_id = create_ld_ident(entity);
 977         set_entity_ld_ident(irentity, ld_id);
 978
 979         handle_decl_modifiers(irentity, entity);
 980
 981         if (! nested_function) {
 982                 /* static inline             => local
 983                  * extern inline             => local
 984                  * inline without definition => local
 985                  * inline with definition    => external_visible */
 986                 storage_class_tag_t const storage_class
 987                         = (storage_class_tag_t) entity->declaration.storage_class;
 988                 bool                const is_inline     = entity->function.is_inline;
 989
 990                 if (is_inline && storage_class == STORAGE_CLASS_NONE && has_body) {
 991                     set_entity_visibility(irentity, ir_visibility_default);
 992                 } else if (storage_class == STORAGE_CLASS_STATIC ||
 993                            (is_inline && has_body)) {
 994                     set_entity_visibility(irentity, ir_visibility_local);
 995                 } else if (has_body) {
 996                     set_entity_visibility(irentity, ir_visibility_default);
 997                 } else {
 998                     set_entity_visibility(irentity, ir_visibility_external);
 999                 }
1000         } else {
1001                 /* nested functions are always local */
1002                 set_entity_visibility(irentity, ir_visibility_local);
1003         }
1004
1005         /* We should check for file scope here, but as long as we compile C only
1006            this is not needed. */
1007         if (!freestanding && !has_body) {
1008                 /* check for a known runtime function */
1009                 for (size_t i = 0; i < lengthof(rts_data); ++i) {
1010                         if (id != rts_idents[i])
1011                                 continue;
1012
1013                         function_type_t *function_type
1014                                 = &entity->declaration.type->function;
1015                         /* rts_entities code can't handle a "wrong" number of parameters */
1016                         if (function_type->unspecified_parameters)
1017                                 continue;
1018
1019                         /* check number of parameters */
1020                         int n_params = count_parameters(function_type);
1021                         if (n_params != rts_data[i].n_params)
1022                                 continue;
1023
1024                         type_t *return_type = skip_typeref(function_type->return_type);
1025                         int     n_res       = is_type_void(return_type) ? 0 : 1;
1026                         if (n_res != rts_data[i].n_res)
1027                                 continue;
1028
1029                         /* ignore those rts functions not necessary needed for current mode */
1030                         if ((c_mode & rts_data[i].flags) == 0)
1031                                 continue;
1032                         assert(rts_entities[rts_data[i].id] == NULL);
1033                         rts_entities[rts_data[i].id] = irentity;
1034                 }
1035         }
1036
1037         entitymap_insert(&entitymap, symbol, irentity);
1038
1039 entity_created:
1040         entity->declaration.kind  = DECLARATION_KIND_FUNCTION;
1041         entity->function.irentity = irentity;
1042
1043         return irentity;
1044 }
1045
1046 /**
1047  * Creates a SymConst for a given entity.
1048  *
1049  * @param dbgi    debug info
1050  * @param entity  the entity
1051  */
1052 static ir_node *create_symconst(dbg_info *dbgi, ir_entity *entity)
1053 {
1054         assert(entity != NULL);
1055         union symconst_symbol sym;
1056         sym.entity_p = entity;
1057         return new_d_SymConst(dbgi, mode_P, sym, symconst_addr_ent);
1058 }
1059
1060 static ir_node *create_Const_from_bool(ir_mode *const mode, bool const v)
1061 {
1062         return new_Const((v ? get_mode_one : get_mode_null)(mode));
1063 }
1064
1065 static ir_node *create_conv_from_b(dbg_info *dbgi, ir_node *value,
1066                                    ir_mode *dest_mode)
1067 {
1068         if (is_Const(value)) {
1069                 return create_Const_from_bool(dest_mode, !is_Const_null(value));
1070         }
1071
1072         ir_node *cond       = new_d_Cond(dbgi, value);
1073         ir_node *proj_true  = new_Proj(cond, mode_X, pn_Cond_true);
1074         ir_node *proj_false = new_Proj(cond, mode_X, pn_Cond_false);
1075         ir_node *tblock     = new_Block(1, &proj_true);
1076         ir_node *fblock     = new_Block(1, &proj_false);
1077         set_cur_block(tblock);
1078         ir_node *const1 = new_Const(get_mode_one(dest_mode));
1079         ir_node *tjump  = new_Jmp();
1080         set_cur_block(fblock);
1081         ir_node *const0 = new_Const(get_mode_null(dest_mode));
1082         ir_node *fjump  = new_Jmp();
1083
1084         ir_node *in[2]      = { tjump, fjump };
1085         ir_node *mergeblock = new_Block(2, in);
1086         set_cur_block(mergeblock);
1087         ir_node *phi_in[2]  = { const1, const0 };
1088         ir_node *phi        = new_Phi(2, phi_in, dest_mode);
1089         return phi;
1090 }
1091
1092 static ir_node *create_conv(dbg_info *dbgi, ir_node *value, ir_mode *dest_mode)
1093 {
1094         ir_mode *value_mode = get_irn_mode(value);
1095
1096         if (value_mode == dest_mode)
1097                 return value;
1098
1099         if (dest_mode == mode_b) {
1100                 ir_node *zero = new_Const(get_mode_null(value_mode));
1101                 ir_node *cmp  = new_d_Cmp(dbgi, value, zero, ir_relation_unordered_less_greater);
1102                 return cmp;
1103         } else if (value_mode == mode_b) {
1104                 return create_conv_from_b(dbgi, value, dest_mode);
1105         }
1106
1107         return new_d_Conv(dbgi, value, dest_mode);
1108 }
1109
1110 /**
1111  * Creates a SymConst node representing a wide string literal.
1112  *
1113  * @param literal   the wide string literal
1114  */
1115 static ir_node *wide_string_literal_to_firm(
1116                 const string_literal_expression_t *literal)
1117 {
1118         ir_type  *const global_type = get_glob_type();
1119         ir_type  *const elem_type   = ir_type_wchar_t;
1120         dbg_info *const dbgi        = get_dbg_info(&literal->base.source_position);
1121         ir_type  *const type        = new_type_array(1, elem_type);
1122
1123         ident     *const id     = id_unique("str.%u");
1124         ir_entity *const entity = new_d_entity(global_type, id, type, dbgi);
1125         set_entity_ld_ident(entity, id);
1126         set_entity_visibility(entity, ir_visibility_private);
1127         add_entity_linkage(entity, IR_LINKAGE_CONSTANT);
1128
1129         ir_mode      *const mode = get_type_mode(elem_type);
1130         const size_t        slen = wstrlen(&literal->value);
1131
1132         set_array_lower_bound_int(type, 0, 0);
1133         set_array_upper_bound_int(type, 0, slen);
1134         set_type_size_bytes(type, slen * get_mode_size_bytes(mode));
1135         set_type_state(type, layout_fixed);
1136
1137         ir_initializer_t *initializer = create_initializer_compound(slen);
1138         const char              *p    = literal->value.begin;
1139         for (size_t i = 0; i < slen; ++i) {
1140                 assert(p < literal->value.begin + literal->value.size);
1141                 utf32             v   = read_utf8_char(&p);
1142                 ir_tarval        *tv  = new_tarval_from_long(v, mode);
1143                 ir_initializer_t *val = create_initializer_tarval(tv);
1144                 set_initializer_compound_value(initializer, i, val);
1145         }
1146         set_entity_initializer(entity, initializer);
1147
1148         return create_symconst(dbgi, entity);
1149 }
1150
1151 /**
1152  * Creates a SymConst node representing a string constant.
1153  *
1154  * @param src_pos    the source position of the string constant
1155  * @param id_prefix  a prefix for the name of the generated string constant
1156  * @param value      the value of the string constant
1157  */
1158 static ir_node *string_to_firm(const source_position_t *const src_pos,
1159                                const char *const id_prefix,
1160                                const string_t *const value)
1161 {
1162         ir_type  *const global_type = get_glob_type();
1163         dbg_info *const dbgi        = get_dbg_info(src_pos);
1164         ir_type  *const type        = new_type_array(1, ir_type_const_char);
1165
1166         ident     *const id     = id_unique(id_prefix);
1167         ir_entity *const entity = new_d_entity(global_type, id, type, dbgi);
1168         set_entity_ld_ident(entity, id);
1169         set_entity_visibility(entity, ir_visibility_private);
1170         add_entity_linkage(entity, IR_LINKAGE_CONSTANT);
1171
1172         ir_type *const elem_type = ir_type_const_char;
1173         ir_mode *const mode      = get_type_mode(elem_type);
1174
1175         const char* const string = value->begin;
1176         const size_t      slen   = value->size;
1177
1178         set_array_lower_bound_int(type, 0, 0);
1179         set_array_upper_bound_int(type, 0, slen);
1180         set_type_size_bytes(type, slen);
1181         set_type_state(type, layout_fixed);
1182
1183         ir_initializer_t *initializer = create_initializer_compound(slen);
1184         for (size_t i = 0; i < slen; ++i) {
1185                 ir_tarval        *tv  = new_tarval_from_long(string[i], mode);
1186                 ir_initializer_t *val = create_initializer_tarval(tv);
1187                 set_initializer_compound_value(initializer, i, val);
1188         }
1189         set_entity_initializer(entity, initializer);
1190
1191         return create_symconst(dbgi, entity);
1192 }
1193
1194 static bool try_create_integer(literal_expression_t *literal,
1195                                type_t *type, unsigned char base)
1196 {
1197         const char *string = literal->value.begin;
1198         size_t      size   = literal->value.size;
1199
1200         assert(type->kind == TYPE_ATOMIC);
1201         atomic_type_kind_t akind = type->atomic.akind;
1202
1203         ir_mode   *mode = atomic_modes[akind];
1204         ir_tarval *tv   = new_integer_tarval_from_str(string, size, 1, base, mode);
1205         if (tv == tarval_bad)
1206                 return false;
1207
1208         literal->base.type    = type;
1209         literal->target_value = tv;
1210         return true;
1211 }
1212
1213 static void create_integer_tarval(literal_expression_t *literal)
1214 {
1215         unsigned        us     = 0;
1216         unsigned        ls     = 0;
1217         const string_t *suffix = &literal->suffix;
1218         /* parse suffix */
1219         if (suffix->size > 0) {
1220                 for (const char *c = suffix->begin; *c != '\0'; ++c) {
1221                         if (*c == 'u' || *c == 'U') { ++us; }
1222                         if (*c == 'l' || *c == 'L') { ++ls; }
1223                 }
1224         }
1225
1226         unsigned base;
1227         switch (literal->base.kind) {
1228                 case EXPR_LITERAL_INTEGER_OCTAL:       base =  8; break;
1229                 case EXPR_LITERAL_INTEGER:             base = 10; break;
1230                 case EXPR_LITERAL_INTEGER_HEXADECIMAL: base = 16; break;
1231                 default: panic("invalid literal kind");
1232         }
1233
1234         tarval_int_overflow_mode_t old_mode = tarval_get_integer_overflow_mode();
1235
1236         /* now try if the constant is small enough for some types */
1237         tarval_set_integer_overflow_mode(TV_OVERFLOW_BAD);
1238         if (ls < 1) {
1239                 if (us == 0 && try_create_integer(literal, type_int, base))
1240                         goto finished;
1241                 if ((us == 1 || base != 10)
1242                                 && try_create_integer(literal, type_unsigned_int, base))
1243                         goto finished;
1244         }
1245         if (ls < 2) {
1246                 if (us == 0 && try_create_integer(literal, type_long, base))
1247                         goto finished;
1248                 if ((us == 1 || base != 10)
1249                                 && try_create_integer(literal, type_unsigned_long, base))
1250                         goto finished;
1251         }
1252         /* last try? then we should not report tarval_bad */
1253         if (us != 1 && base == 10)
1254                 tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
1255         if (us == 0 && try_create_integer(literal, type_long_long, base))
1256                 goto finished;
1257
1258         /* last try */
1259         assert(us == 1 || base != 10);
1260         tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
1261         bool res = try_create_integer(literal, type_unsigned_long_long, base);
1262         if (!res)
1263                 panic("internal error when parsing number literal");
1264
1265 finished:
1266         tarval_set_integer_overflow_mode(old_mode);
1267 }
1268
1269 void determine_literal_type(literal_expression_t *literal)
1270 {
1271         switch (literal->base.kind) {
1272         case EXPR_LITERAL_INTEGER:
1273         case EXPR_LITERAL_INTEGER_OCTAL:
1274         case EXPR_LITERAL_INTEGER_HEXADECIMAL:
1275                 create_integer_tarval(literal);
1276                 return;
1277         default:
1278                 break;
1279         }
1280 }
1281
1282 /**
1283  * Creates a Const node representing a constant.
1284  */
1285 static ir_node *literal_to_firm(const literal_expression_t *literal)
1286 {
1287         type_t     *type   = skip_typeref(literal->base.type);
1288         ir_mode    *mode   = get_ir_mode_storage(type);
1289         const char *string = literal->value.begin;
1290         size_t      size   = literal->value.size;
1291         ir_tarval  *tv;
1292
1293         switch (literal->base.kind) {
1294         case EXPR_LITERAL_WIDE_CHARACTER: {
1295                 utf32  v = read_utf8_char(&string);
1296                 char   buf[128];
1297                 size_t len = snprintf(buf, sizeof(buf), UTF32_PRINTF_FORMAT, v);
1298
1299                 tv = new_tarval_from_str(buf, len, mode);
1300                 goto make_const;
1301         }
1302         case EXPR_LITERAL_CHARACTER: {
1303                 long long int v;
1304                 bool char_is_signed
1305                         = get_atomic_type_flags(ATOMIC_TYPE_CHAR) & ATOMIC_TYPE_FLAG_SIGNED;
1306                 if (size == 1 && char_is_signed) {
1307                         v = (signed char)string[0];
1308                 } else {
1309                         v = 0;
1310                         for (size_t i = 0; i < size; ++i) {
1311                                 v = (v << 8) | ((unsigned char)string[i]);
1312                         }
1313                 }
1314                 char   buf[128];
1315                 size_t len = snprintf(buf, sizeof(buf), "%lld", v);
1316
1317                 tv = new_tarval_from_str(buf, len, mode);
1318                 goto make_const;
1319         }
1320         case EXPR_LITERAL_INTEGER:
1321         case EXPR_LITERAL_INTEGER_OCTAL:
1322         case EXPR_LITERAL_INTEGER_HEXADECIMAL:
1323                 assert(literal->target_value != NULL);
1324                 tv = literal->target_value;
1325                 goto make_const;
1326         case EXPR_LITERAL_FLOATINGPOINT:
1327                 tv = new_tarval_from_str(string, size, mode);
1328                 goto make_const;
1329         case EXPR_LITERAL_FLOATINGPOINT_HEXADECIMAL: {
1330                 char buffer[size + 2];
1331                 memcpy(buffer, "0x", 2);
1332                 memcpy(buffer+2, string, size);
1333                 tv = new_tarval_from_str(buffer, size+2, mode);
1334                 goto make_const;
1335         }
1336         case EXPR_LITERAL_BOOLEAN:
1337                 if (string[0] == 't') {
1338                         tv = get_mode_one(mode);
1339                 } else {
1340                         assert(string[0] == 'f');
1341                         tv = get_mode_null(mode);
1342                 }
1343                 goto make_const;
1344         case EXPR_LITERAL_MS_NOOP:
1345                 tv = get_mode_null(mode);
1346                 goto make_const;
1347         default:
1348                 break;
1349         }
1350         panic("Invalid literal kind found");
1351
1352 make_const: ;
1353         dbg_info *dbgi       = get_dbg_info(&literal->base.source_position);
1354         ir_node  *res        = new_d_Const(dbgi, tv);
1355         ir_mode  *mode_arith = get_ir_mode_arithmetic(type);
1356         return create_conv(dbgi, res, mode_arith);
1357 }
1358
1359 /*
1360  * Allocate an area of size bytes aligned at alignment
1361  * at a frame type.
1362  */
1363 static ir_entity *alloc_trampoline(ir_type *frame_type, int size, unsigned alignment)
1364 {
1365         static unsigned area_cnt = 0;
1366         char buf[32];
1367
1368         ir_type *tp = new_type_array(1, ir_type_char);
1369         set_array_bounds_int(tp, 0, 0, size);
1370         set_type_alignment_bytes(tp, alignment);
1371
1372         snprintf(buf, sizeof(buf), "trampolin%u", area_cnt++);
1373         ident *name = new_id_from_str(buf);
1374         ir_entity *area = new_entity(frame_type, name, tp);
1375
1376         /* mark this entity as compiler generated */
1377         set_entity_compiler_generated(area, 1);
1378         return area;
1379 }
1380
1381 /**
1382  * Return a node representing a trampoline region
1383  * for a given function entity.
1384  *
1385  * @param dbgi    debug info
1386  * @param entity  the function entity
1387  */
1388 static ir_node *get_trampoline_region(dbg_info *dbgi, ir_entity *entity)
1389 {
1390         ir_entity *region = NULL;
1391         int        i;
1392
1393         if (current_trampolines != NULL) {
1394                 for (i = ARR_LEN(current_trampolines) - 1; i >= 0; --i) {
1395                         if (current_trampolines[i].function == entity) {
1396                                 region = current_trampolines[i].region;
1397                                 break;
1398                         }
1399                 }
1400         } else {
1401                 current_trampolines = NEW_ARR_F(trampoline_region, 0);
1402         }
1403         ir_graph *irg = current_ir_graph;
1404         if (region == NULL) {
1405                 /* create a new region */
1406                 ir_type           *frame_tp = get_irg_frame_type(irg);
1407                 trampoline_region  reg;
1408                 reg.function = entity;
1409
1410                 reg.region   = alloc_trampoline(frame_tp,
1411                                                 be_params->trampoline_size,
1412                                                 be_params->trampoline_align);
1413                 ARR_APP1(trampoline_region, current_trampolines, reg);
1414                 region = reg.region;
1415         }
1416         return new_d_simpleSel(dbgi, get_irg_no_mem(irg), get_irg_frame(irg),
1417                                region);
1418 }
1419
1420 /**
1421  * Creates a trampoline for a function represented by an entity.
1422  *
1423  * @param dbgi    debug info
1424  * @param mode    the (reference) mode for the function address
1425  * @param entity  the function entity
1426  */
1427 static ir_node *create_trampoline(dbg_info *dbgi, ir_mode *mode,
1428                                   ir_entity *entity)
1429 {
1430         assert(entity != NULL);
1431         ir_node *in[3];
1432         in[0] = get_trampoline_region(dbgi, entity);
1433         in[1] = create_symconst(dbgi, entity);
1434         in[2] = get_irg_frame(current_ir_graph);
1435
1436         ir_node *irn = new_d_Builtin(dbgi, get_store(), 3, in, ir_bk_inner_trampoline, get_unknown_type());
1437         set_store(new_Proj(irn, mode_M, pn_Builtin_M));
1438         return new_Proj(irn, mode, pn_Builtin_max+1);
1439 }
1440
1441 /**
1442  * Dereference an address.
1443  *
1444  * @param dbgi  debug info
1445  * @param type  the type of the dereferenced result (the points_to type)
1446  * @param addr  the address to dereference
1447  */
1448 static ir_node *deref_address(dbg_info *const dbgi, type_t *const type,
1449                                       ir_node *const addr)
1450 {
1451         type_t *skipped = skip_typeref(type);
1452         if (is_type_incomplete(skipped))
1453                 return addr;
1454
1455         ir_type *irtype = get_ir_type(skipped);
1456         if (is_compound_type(irtype)
1457             || is_Method_type(irtype)
1458             || is_Array_type(irtype)) {
1459                 return addr;
1460         }
1461
1462         ir_cons_flags  flags    = skipped->base.qualifiers & TYPE_QUALIFIER_VOLATILE
1463                                   ? cons_volatile : cons_none;
1464         ir_mode *const mode     = get_type_mode(irtype);
1465         ir_node *const memory   = get_store();
1466         ir_node *const load     = new_d_Load(dbgi, memory, addr, mode, flags);
1467         ir_node *const load_mem = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1468         ir_node *const load_res = new_d_Proj(dbgi, load, mode,   pn_Load_res);
1469
1470         set_store(load_mem);
1471
1472         ir_mode *const mode_arithmetic = get_ir_mode_arithmetic(skipped);
1473         return create_conv(dbgi, load_res, mode_arithmetic);
1474 }
1475
1476 /**
1477  * Creates a strict Conv (to the node's mode) if necessary.
1478  *
1479  * @param dbgi  debug info
1480  * @param node  the node to strict conv
1481  */
1482 static ir_node *do_strict_conv(dbg_info *dbgi, ir_node *node)
1483 {
1484         ir_mode *mode = get_irn_mode(node);
1485
1486         if (!(get_irg_fp_model(current_ir_graph) & fp_explicit_rounding))
1487                 return node;
1488         if (!mode_is_float(mode))
1489                 return node;
1490
1491         /* check if there is already a Conv */
1492         if (is_Conv(node)) {
1493                 /* convert it into a strict Conv */
1494                 set_Conv_strict(node, 1);
1495                 return node;
1496         }
1497
1498         /* otherwise create a new one */
1499         return new_d_strictConv(dbgi, node, mode);
1500 }
1501
1502 /**
1503  * Returns the correct base address depending on whether it is a parameter or a
1504  * normal local variable.
1505  */
1506 static ir_node *get_local_frame(ir_entity *const ent)
1507 {
1508         ir_graph      *const irg   = current_ir_graph;
1509         const ir_type *const owner = get_entity_owner(ent);
1510         if (owner == current_outer_frame) {
1511                 assert(current_static_link != NULL);
1512                 return current_static_link;
1513         } else {
1514                 return get_irg_frame(irg);
1515         }
1516 }
1517
1518 /**
1519  * Keep all memory edges of the given block.
1520  */
1521 static void keep_all_memory(ir_node *block)
1522 {
1523         ir_node *old = get_cur_block();
1524
1525         set_cur_block(block);
1526         keep_alive(get_store());
1527         /* TODO: keep all memory edges from restricted pointers */
1528         set_cur_block(old);
1529 }
1530
1531 static ir_node *enum_constant_to_firm(reference_expression_t const *const ref)
1532 {
1533         entity_t *entity = ref->entity;
1534         if (entity->enum_value.tv == NULL) {
1535                 type_t *type = skip_typeref(entity->enum_value.enum_type);
1536                 assert(type->kind == TYPE_ENUM);
1537                 determine_enum_values(&type->enumt);
1538         }
1539
1540         return new_Const(entity->enum_value.tv);
1541 }
1542
1543 static ir_node *reference_expression_to_firm(const reference_expression_t *ref)
1544 {
1545         dbg_info *dbgi   = get_dbg_info(&ref->base.source_position);
1546         entity_t *entity = ref->entity;
1547         assert(is_declaration(entity));
1548         type_t   *type   = skip_typeref(entity->declaration.type);
1549
1550         /* make sure the type is constructed */
1551         (void) get_ir_type(type);
1552
1553         if (entity->kind == ENTITY_FUNCTION
1554             && entity->function.btk != BUILTIN_NONE) {
1555                 ir_entity *irentity = get_function_entity(entity, NULL);
1556                 /* for gcc compatibility we have to produce (dummy) addresses for some
1557                  * builtins which don't have entities */
1558                 if (irentity == NULL) {
1559                         source_position_t const *const pos = &ref->base.source_position;
1560                         symbol_t          const *const sym = ref->entity->base.symbol;
1561                         warningf(WARN_OTHER, pos, "taking address of builtin '%Y'", sym);
1562
1563                         /* simply create a NULL pointer */
1564                         ir_mode  *mode = get_ir_mode_arithmetic(type_void_ptr);
1565                         ir_node  *res  = new_Const(get_mode_null(mode));
1566
1567                         return res;
1568                 }
1569         }
1570
1571         switch ((declaration_kind_t) entity->declaration.kind) {
1572         case DECLARATION_KIND_UNKNOWN:
1573                 break;
1574
1575         case DECLARATION_KIND_LOCAL_VARIABLE: {
1576                 ir_mode *const mode  = get_ir_mode_storage(type);
1577                 ir_node *const value = get_value(entity->variable.v.value_number, mode);
1578                 return create_conv(NULL, value, get_ir_mode_arithmetic(type));
1579         }
1580         case DECLARATION_KIND_PARAMETER: {
1581                 ir_mode *const mode  = get_ir_mode_storage(type);
1582                 ir_node *const value = get_value(entity->parameter.v.value_number,mode);
1583                 return create_conv(NULL, value, get_ir_mode_arithmetic(type));
1584         }
1585         case DECLARATION_KIND_FUNCTION: {
1586                 return create_symconst(dbgi, entity->function.irentity);
1587         }
1588         case DECLARATION_KIND_INNER_FUNCTION: {
1589                 ir_mode *const mode = get_ir_mode_storage(type);
1590                 if (!entity->function.goto_to_outer && !entity->function.need_closure) {
1591                         /* inner function not using the closure */
1592                         return create_symconst(dbgi, entity->function.irentity);
1593                 } else {
1594                         /* need trampoline here */
1595                         return create_trampoline(dbgi, mode, entity->function.irentity);
1596                 }
1597         }
1598         case DECLARATION_KIND_GLOBAL_VARIABLE: {
1599                 const variable_t *variable = &entity->variable;
1600                 ir_node *const addr = create_symconst(dbgi, variable->v.entity);
1601                 return deref_address(dbgi, variable->base.type, addr);
1602         }
1603
1604         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY: {
1605                 ir_entity *irentity = entity->variable.v.entity;
1606                 ir_node   *frame    = get_local_frame(irentity);
1607                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1608                 return deref_address(dbgi, entity->declaration.type, sel);
1609         }
1610         case DECLARATION_KIND_PARAMETER_ENTITY: {
1611                 ir_entity *irentity = entity->parameter.v.entity;
1612                 ir_node   *frame    = get_local_frame(irentity);
1613                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1614                 return deref_address(dbgi, entity->declaration.type, sel);
1615         }
1616
1617         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
1618                 return entity->variable.v.vla_base;
1619
1620         case DECLARATION_KIND_COMPOUND_MEMBER:
1621                 panic("not implemented reference type");
1622         }
1623
1624         panic("reference to declaration with unknown type found");
1625 }
1626
1627 static ir_node *reference_addr(const reference_expression_t *ref)
1628 {
1629         dbg_info *dbgi   = get_dbg_info(&ref->base.source_position);
1630         entity_t *entity = ref->entity;
1631         assert(is_declaration(entity));
1632
1633         switch((declaration_kind_t) entity->declaration.kind) {
1634         case DECLARATION_KIND_UNKNOWN:
1635                 break;
1636         case DECLARATION_KIND_PARAMETER:
1637         case DECLARATION_KIND_LOCAL_VARIABLE:
1638                 /* you can store to a local variable (so we don't panic but return NULL
1639                  * as an indicator for no real address) */
1640                 return NULL;
1641         case DECLARATION_KIND_GLOBAL_VARIABLE: {
1642                 ir_node *const addr = create_symconst(dbgi, entity->variable.v.entity);
1643                 return addr;
1644         }
1645         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY: {
1646                 ir_entity *irentity = entity->variable.v.entity;
1647                 ir_node   *frame    = get_local_frame(irentity);
1648                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1649
1650                 return sel;
1651         }
1652         case DECLARATION_KIND_PARAMETER_ENTITY: {
1653                 ir_entity *irentity = entity->parameter.v.entity;
1654                 ir_node   *frame    = get_local_frame(irentity);
1655                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1656
1657                 return sel;
1658         }
1659
1660         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
1661                 return entity->variable.v.vla_base;
1662
1663         case DECLARATION_KIND_FUNCTION: {
1664                 return create_symconst(dbgi, entity->function.irentity);
1665         }
1666
1667         case DECLARATION_KIND_INNER_FUNCTION: {
1668                 type_t  *const type = skip_typeref(entity->declaration.type);
1669                 ir_mode *const mode = get_ir_mode_storage(type);
1670                 if (!entity->function.goto_to_outer && !entity->function.need_closure) {
1671                         /* inner function not using the closure */
1672                         return create_symconst(dbgi, entity->function.irentity);
1673                 } else {
1674                         /* need trampoline here */
1675                         return create_trampoline(dbgi, mode, entity->function.irentity);
1676                 }
1677         }
1678
1679         case DECLARATION_KIND_COMPOUND_MEMBER:
1680                 panic("not implemented reference type");
1681         }
1682
1683         panic("reference to declaration with unknown type found");
1684 }
1685
1686 /**
1687  * Transform calls to builtin functions.
1688  */
1689 static ir_node *process_builtin_call(const call_expression_t *call)
1690 {
1691         dbg_info *dbgi = get_dbg_info(&call->base.source_position);
1692
1693         assert(call->function->kind == EXPR_REFERENCE);
1694         reference_expression_t *builtin = &call->function->reference;
1695
1696         type_t *expr_type = skip_typeref(builtin->base.type);
1697         assert(is_type_pointer(expr_type));
1698
1699         type_t *function_type = skip_typeref(expr_type->pointer.points_to);
1700
1701         switch (builtin->entity->function.btk) {
1702         case BUILTIN_NONE:
1703                 break;
1704         case BUILTIN_ALLOCA: {
1705                 expression_t *argument = call->arguments->expression;
1706                 ir_node      *size     = expression_to_firm(argument);
1707
1708                 ir_node *store  = get_store();
1709                 ir_node *alloca = new_d_Alloc(dbgi, store, size, get_unknown_type(),
1710                                               stack_alloc);
1711                 ir_node *proj_m = new_Proj(alloca, mode_M, pn_Alloc_M);
1712                 set_store(proj_m);
1713                 ir_node *res    = new_Proj(alloca, mode_P_data, pn_Alloc_res);
1714
1715                 return res;
1716         }
1717         case BUILTIN_INF: {
1718                 type_t    *type = function_type->function.return_type;
1719                 ir_mode   *mode = get_ir_mode_arithmetic(type);
1720                 ir_tarval *tv   = get_mode_infinite(mode);
1721                 ir_node   *res  = new_d_Const(dbgi, tv);
1722                 return res;
1723         }
1724         case BUILTIN_NAN: {
1725                 /* Ignore string for now... */
1726                 assert(is_type_function(function_type));
1727                 type_t    *type = function_type->function.return_type;
1728                 ir_mode   *mode = get_ir_mode_arithmetic(type);
1729                 ir_tarval *tv   = get_mode_NAN(mode);
1730                 ir_node   *res  = new_d_Const(dbgi, tv);
1731                 return res;
1732         }
1733         case BUILTIN_EXPECT: {
1734                 expression_t *argument = call->arguments->expression;
1735                 return _expression_to_firm(argument);
1736         }
1737         case BUILTIN_VA_END:
1738                 /* evaluate the argument of va_end for its side effects */
1739                 _expression_to_firm(call->arguments->expression);
1740                 return NULL;
1741         case BUILTIN_OBJECT_SIZE: {
1742                 /* determine value of "type" */
1743                 expression_t *type_expression = call->arguments->next->expression;
1744                 long          type_val        = fold_constant_to_int(type_expression);
1745                 type_t       *type            = function_type->function.return_type;
1746                 ir_mode      *mode            = get_ir_mode_arithmetic(type);
1747                 /* just produce a "I don't know" result */
1748                 ir_tarval    *result          = type_val & 2 ? get_mode_null(mode) :
1749                                                 get_mode_minus_one(mode);
1750
1751                 return new_d_Const(dbgi, result);
1752         }
1753         case BUILTIN_ROTL: {
1754                 ir_node *val  = expression_to_firm(call->arguments->expression);
1755                 ir_node *shf  = expression_to_firm(call->arguments->next->expression);
1756                 ir_mode *mode = get_irn_mode(val);
1757                 ir_mode *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1758                 return new_d_Rotl(dbgi, val, create_conv(dbgi, shf, mode_uint), mode);
1759         }
1760         case BUILTIN_ROTR: {
1761                 ir_node *val  = expression_to_firm(call->arguments->expression);
1762                 ir_node *shf  = expression_to_firm(call->arguments->next->expression);
1763                 ir_mode *mode = get_irn_mode(val);
1764                 ir_mode *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1765                 ir_node *c    = new_Const_long(mode_uint, get_mode_size_bits(mode));
1766                 ir_node *sub  = new_d_Sub(dbgi, c, create_conv(dbgi, shf, mode_uint), mode_uint);
1767                 return new_d_Rotl(dbgi, val, sub, mode);
1768         }
1769         case BUILTIN_FIRM:
1770                 break;
1771         case BUILTIN_LIBC:
1772         case BUILTIN_LIBC_CHECK:
1773                 panic("builtin did not produce an entity");
1774         }
1775         panic("invalid builtin found");
1776 }
1777
1778 /**
1779  * Transform a call expression.
1780  * Handles some special cases, like alloca() calls, which must be resolved
1781  * BEFORE the inlines runs. Inlining routines calling alloca() is dangerous,
1782  * 176.gcc for instance might allocate 2GB instead of 256 MB if alloca is not
1783  * handled right...
1784  */
1785 static ir_node *call_expression_to_firm(const call_expression_t *const call)
1786 {
1787         dbg_info *const dbgi = get_dbg_info(&call->base.source_position);
1788         assert(currently_reachable());
1789
1790         expression_t   *function = call->function;
1791         ir_node        *callee   = NULL;
1792         bool            firm_builtin = false;
1793         ir_builtin_kind firm_builtin_kind = ir_bk_trap;
1794         if (function->kind == EXPR_REFERENCE) {
1795                 const reference_expression_t *ref    = &function->reference;
1796                 entity_t                     *entity = ref->entity;
1797
1798                 if (entity->kind == ENTITY_FUNCTION) {
1799                         builtin_kind_t builtin = entity->function.btk;
1800                         if (builtin == BUILTIN_FIRM) {
1801                                 firm_builtin = true;
1802                                 firm_builtin_kind = entity->function.b.firm_builtin_kind;
1803                         } else if (builtin != BUILTIN_NONE && builtin != BUILTIN_LIBC
1804                                    && builtin != BUILTIN_LIBC_CHECK) {
1805                                 return process_builtin_call(call);
1806                         }
1807                 }
1808         }
1809         if (!firm_builtin)
1810                 callee = expression_to_firm(function);
1811
1812         type_t *type = skip_typeref(function->base.type);
1813         assert(is_type_pointer(type));
1814         pointer_type_t *pointer_type = &type->pointer;
1815         type_t         *points_to    = skip_typeref(pointer_type->points_to);
1816         assert(is_type_function(points_to));
1817         function_type_t *function_type = &points_to->function;
1818
1819         int      n_parameters    = 0;
1820         ir_type *ir_method_type  = get_ir_type((type_t*) function_type);
1821         ir_type *new_method_type = NULL;
1822         if (function_type->variadic || function_type->unspecified_parameters) {
1823                 const call_argument_t *argument = call->arguments;
1824                 for ( ; argument != NULL; argument = argument->next) {
1825                         ++n_parameters;
1826                 }
1827
1828                 /* we need to construct a new method type matching the call
1829                  * arguments... */
1830                 type_dbg_info *tdbgi = get_type_dbg_info_((const type_t*) function_type);
1831                 int n_res       = get_method_n_ress(ir_method_type);
1832                 new_method_type = new_d_type_method(n_parameters, n_res, tdbgi);
1833                 set_method_calling_convention(new_method_type,
1834                                get_method_calling_convention(ir_method_type));
1835                 set_method_additional_properties(new_method_type,
1836                                get_method_additional_properties(ir_method_type));
1837                 set_method_variadicity(new_method_type,
1838                                        get_method_variadicity(ir_method_type));
1839
1840                 for (int i = 0; i < n_res; ++i) {
1841                         set_method_res_type(new_method_type, i,
1842                                             get_method_res_type(ir_method_type, i));
1843                 }
1844                 argument = call->arguments;
1845                 for (int i = 0; i < n_parameters; ++i, argument = argument->next) {
1846                         expression_t *expression = argument->expression;
1847                         ir_type      *irtype     = get_ir_type(expression->base.type);
1848                         set_method_param_type(new_method_type, i, irtype);
1849                 }
1850                 ir_method_type = new_method_type;
1851         } else {
1852                 n_parameters = get_method_n_params(ir_method_type);
1853         }
1854
1855         ir_node *in[n_parameters];
1856
1857         const call_argument_t *argument = call->arguments;
1858         for (int n = 0; n < n_parameters; ++n) {
1859                 expression_t *expression = argument->expression;
1860                 ir_node      *arg_node   = expression_to_firm(expression);
1861
1862                 type_t *arg_type = skip_typeref(expression->base.type);
1863                 if (!is_type_compound(arg_type)) {
1864                         ir_mode *mode = get_ir_mode_storage(expression->base.type);
1865                         arg_node      = create_conv(dbgi, arg_node, mode);
1866                         arg_node      = do_strict_conv(dbgi, arg_node);
1867                 }
1868
1869                 in[n] = arg_node;
1870
1871                 argument = argument->next;
1872         }
1873
1874         ir_node *store;
1875         if (function_type->modifiers & DM_CONST) {
1876                 store = get_irg_no_mem(current_ir_graph);
1877         } else {
1878                 store = get_store();
1879         }
1880
1881         ir_node *node;
1882         type_t  *return_type = skip_typeref(function_type->return_type);
1883         ir_node *result      = NULL;
1884         if (firm_builtin) {
1885                 node = new_d_Builtin(dbgi, store, n_parameters, in, firm_builtin_kind,
1886                                      ir_method_type);
1887                 if (! (function_type->modifiers & DM_CONST)) {
1888                         ir_node *mem = new_Proj(node, mode_M, pn_Builtin_M);
1889                         set_store(mem);
1890                 }
1891
1892                 if (!is_type_void(return_type)) {
1893                         assert(is_type_scalar(return_type));
1894                         ir_mode *mode = get_ir_mode_storage(return_type);
1895                         result = new_Proj(node, mode, pn_Builtin_max+1);
1896                         ir_mode *mode_arith = get_ir_mode_arithmetic(return_type);
1897                         result              = create_conv(NULL, result, mode_arith);
1898                 }
1899         } else {
1900                 node = new_d_Call(dbgi, store, callee, n_parameters, in, ir_method_type);
1901                 if (! (function_type->modifiers & DM_CONST)) {
1902                         ir_node *mem = new_Proj(node, mode_M, pn_Call_M);
1903                         set_store(mem);
1904                 }
1905
1906                 if (!is_type_void(return_type)) {
1907                         ir_node *resproj = new_Proj(node, mode_T, pn_Call_T_result);
1908
1909                         if (is_type_scalar(return_type)) {
1910                                 ir_mode *mode       = get_ir_mode_storage(return_type);
1911                                 result              = new_Proj(resproj, mode, 0);
1912                                 ir_mode *mode_arith = get_ir_mode_arithmetic(return_type);
1913                                 result              = create_conv(NULL, result, mode_arith);
1914                         } else {
1915                                 ir_mode *mode = mode_P_data;
1916                                 result        = new_Proj(resproj, mode, 0);
1917                         }
1918                 }
1919         }
1920
1921         if (function_type->modifiers & DM_NORETURN) {
1922                 /* A dead end:  Keep the Call and the Block.  Also place all further
1923                  * nodes into a new and unreachable block. */
1924                 keep_alive(node);
1925                 keep_alive(get_cur_block());
1926                 ir_node *block = new_Block(0, NULL);
1927                 set_cur_block(block);
1928         }
1929
1930         return result;
1931 }
1932
1933 static ir_node *statement_to_firm(statement_t *statement);
1934 static ir_node *compound_statement_to_firm(compound_statement_t *compound);
1935
1936 static ir_node *expression_to_addr(const expression_t *expression);
1937 static ir_node *create_condition_evaluation(const expression_t *expression,
1938                                             ir_node *true_block,
1939                                             ir_node *false_block);
1940
1941 static void assign_value(dbg_info *dbgi, ir_node *addr, type_t *type,
1942                          ir_node *value)
1943 {
1944         if (!is_type_compound(type)) {
1945                 ir_mode *mode = get_ir_mode_storage(type);
1946                 value         = create_conv(dbgi, value, mode);
1947                 value         = do_strict_conv(dbgi, value);
1948         }
1949
1950         ir_node *memory = get_store();
1951
1952         if (is_type_scalar(type)) {
1953                 ir_cons_flags flags = type->base.qualifiers & TYPE_QUALIFIER_VOLATILE
1954                                       ? cons_volatile : cons_none;
1955                 ir_node  *store     = new_d_Store(dbgi, memory, addr, value, flags);
1956                 ir_node  *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
1957                 set_store(store_mem);
1958         } else {
1959                 ir_type *irtype    = get_ir_type(type);
1960                 ir_node *copyb     = new_d_CopyB(dbgi, memory, addr, value, irtype);
1961                 ir_node *copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
1962                 set_store(copyb_mem);
1963         }
1964 }
1965
1966 static ir_tarval *create_bitfield_mask(ir_mode *mode, int offset, int size)
1967 {
1968         ir_tarval *all_one   = get_mode_all_one(mode);
1969         int        mode_size = get_mode_size_bits(mode);
1970         ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1971
1972         assert(offset >= 0);
1973         assert(size   >= 0);
1974         assert(offset + size <= mode_size);
1975         if (size == mode_size) {
1976                 return all_one;
1977         }
1978
1979         long       shiftr    = get_mode_size_bits(mode) - size;
1980         long       shiftl    = offset;
1981         ir_tarval *tv_shiftr = new_tarval_from_long(shiftr, mode_uint);
1982         ir_tarval *tv_shiftl = new_tarval_from_long(shiftl, mode_uint);
1983         ir_tarval *mask0     = tarval_shr(all_one, tv_shiftr);
1984         ir_tarval *mask1     = tarval_shl(mask0, tv_shiftl);
1985
1986         return mask1;
1987 }
1988
1989 static ir_node *bitfield_store_to_firm(dbg_info *dbgi,
1990                 ir_entity *entity, ir_node *addr, ir_node *value, bool set_volatile,
1991                 bool need_return)
1992 {
1993         ir_type *entity_type = get_entity_type(entity);
1994         ir_type *base_type   = get_primitive_base_type(entity_type);
1995         ir_mode *mode        = get_type_mode(base_type);
1996         ir_mode *mode_uint   = atomic_modes[ATOMIC_TYPE_UINT];
1997
1998         value = create_conv(dbgi, value, mode);
1999
2000         /* kill upper bits of value and shift to right position */
2001         unsigned  bitoffset  = get_entity_offset_bits_remainder(entity);
2002         unsigned  bitsize    = get_mode_size_bits(get_type_mode(entity_type));
2003         unsigned  base_bits  = get_mode_size_bits(mode);
2004         unsigned  shiftwidth = base_bits - bitsize;
2005
2006         ir_node  *shiftcount = new_Const_long(mode_uint, shiftwidth);
2007         ir_node  *shiftl     = new_d_Shl(dbgi, value, shiftcount, mode);
2008
2009         unsigned  shrwidth   = base_bits - bitsize - bitoffset;
2010         ir_node  *shrconst   = new_Const_long(mode_uint, shrwidth);
2011         ir_node  *shiftr     = new_d_Shr(dbgi, shiftl, shrconst, mode);
2012
2013         /* load current value */
2014         ir_node   *mem             = get_store();
2015         ir_node   *load            = new_d_Load(dbgi, mem, addr, mode,
2016                                           set_volatile ? cons_volatile : cons_none);
2017         ir_node   *load_mem        = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
2018         ir_node   *load_res        = new_d_Proj(dbgi, load, mode, pn_Load_res);
2019         ir_tarval *shift_mask      = create_bitfield_mask(mode, bitoffset, bitsize);
2020         ir_tarval *inv_mask        = tarval_not(shift_mask);
2021         ir_node   *inv_mask_node   = new_d_Const(dbgi, inv_mask);
2022         ir_node   *load_res_masked = new_d_And(dbgi, load_res, inv_mask_node, mode);
2023
2024         /* construct new value and store */
2025         ir_node *new_val   = new_d_Or(dbgi, load_res_masked, shiftr, mode);
2026         ir_node *store     = new_d_Store(dbgi, load_mem, addr, new_val,
2027                                          set_volatile ? cons_volatile : cons_none);
2028         ir_node *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
2029         set_store(store_mem);
2030
2031         if (!need_return)
2032                 return NULL;
2033
2034         ir_node *res_shr;
2035         ir_node *count_res_shr = new_Const_long(mode_uint, base_bits - bitsize);
2036         if (mode_is_signed(mode)) {
2037                 res_shr = new_d_Shrs(dbgi, shiftl, count_res_shr, mode);
2038         } else {
2039                 res_shr = new_d_Shr(dbgi, shiftl, count_res_shr, mode);
2040         }
2041         return res_shr;
2042 }
2043
2044 static ir_node *bitfield_extract_to_firm(const select_expression_t *expression,
2045                                          ir_node *addr)
2046 {
2047         dbg_info *dbgi      = get_dbg_info(&expression->base.source_position);
2048         entity_t *entity    = expression->compound_entry;
2049         type_t   *base_type = entity->declaration.type;
2050         ir_mode  *mode      = get_ir_mode_storage(base_type);
2051         ir_node  *mem       = get_store();
2052         ir_node  *load      = new_d_Load(dbgi, mem, addr, mode, cons_none);
2053         ir_node  *load_mem  = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
2054         ir_node  *load_res  = new_d_Proj(dbgi, load, mode, pn_Load_res);
2055         ir_mode  *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
2056
2057         ir_mode  *amode     = mode;
2058         /* optimisation, since shifting in modes < machine_size is usually
2059          * less efficient */
2060         if (get_mode_size_bits(amode) < get_mode_size_bits(mode_uint)) {
2061                 amode = mode_uint;
2062         }
2063         unsigned amode_size = get_mode_size_bits(amode);
2064         load_res = create_conv(dbgi, load_res, amode);
2065
2066         set_store(load_mem);
2067
2068         /* kill upper bits */
2069         assert(expression->compound_entry->kind == ENTITY_COMPOUND_MEMBER);
2070         unsigned   bitoffset   = entity->compound_member.bit_offset;
2071         unsigned   bitsize     = entity->compound_member.bit_size;
2072         unsigned   shift_bitsl = amode_size - bitoffset - bitsize;
2073         ir_tarval *tvl         = new_tarval_from_long((long)shift_bitsl, mode_uint);
2074         ir_node   *countl      = new_d_Const(dbgi, tvl);
2075         ir_node   *shiftl      = new_d_Shl(dbgi, load_res, countl, amode);
2076
2077         unsigned   shift_bitsr = bitoffset + shift_bitsl;
2078         assert(shift_bitsr <= amode_size);
2079         ir_tarval *tvr         = new_tarval_from_long((long)shift_bitsr, mode_uint);
2080         ir_node   *countr      = new_d_Const(dbgi, tvr);
2081         ir_node   *shiftr;
2082         if (mode_is_signed(mode)) {
2083                 shiftr = new_d_Shrs(dbgi, shiftl, countr, amode);
2084         } else {
2085                 shiftr = new_d_Shr(dbgi, shiftl, countr, amode);
2086         }
2087
2088         type_t  *type    = expression->base.type;
2089         ir_mode *resmode = get_ir_mode_arithmetic(type);
2090         return create_conv(dbgi, shiftr, resmode);
2091 }
2092
2093 /* make sure the selected compound type is constructed */
2094 static void construct_select_compound(const select_expression_t *expression)
2095 {
2096         type_t *type = skip_typeref(expression->compound->base.type);
2097         if (is_type_pointer(type)) {
2098                 type = type->pointer.points_to;
2099         }
2100         (void) get_ir_type(type);
2101 }
2102
2103 static ir_node *set_value_for_expression_addr(const expression_t *expression,
2104                                               ir_node *value, ir_node *addr)
2105 {
2106         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2107         type_t   *type = skip_typeref(expression->base.type);
2108
2109         if (!is_type_compound(type)) {
2110                 ir_mode  *mode = get_ir_mode_storage(type);
2111                 value          = create_conv(dbgi, value, mode);
2112                 value          = do_strict_conv(dbgi, value);
2113         }
2114
2115         if (expression->kind == EXPR_REFERENCE) {
2116                 const reference_expression_t *ref = &expression->reference;
2117
2118                 entity_t *entity = ref->entity;
2119                 assert(is_declaration(entity));
2120                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2121                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE) {
2122                         set_value(entity->variable.v.value_number, value);
2123                         return value;
2124                 } else if (entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
2125                         set_value(entity->parameter.v.value_number, value);
2126                         return value;
2127                 }
2128         }
2129
2130         if (addr == NULL)
2131                 addr = expression_to_addr(expression);
2132         assert(addr != NULL);
2133
2134         if (expression->kind == EXPR_SELECT) {
2135                 const select_expression_t *select = &expression->select;
2136
2137                 construct_select_compound(select);
2138
2139                 entity_t *entity = select->compound_entry;
2140                 assert(entity->kind == ENTITY_COMPOUND_MEMBER);
2141                 if (entity->compound_member.bitfield) {
2142                         ir_entity *irentity = entity->compound_member.entity;
2143                         bool       set_volatile
2144                                 = select->base.type->base.qualifiers & TYPE_QUALIFIER_VOLATILE;
2145                         value = bitfield_store_to_firm(dbgi, irentity, addr, value,
2146                                                        set_volatile, true);
2147                         return value;
2148                 }
2149         }
2150
2151         assign_value(dbgi, addr, type, value);
2152         return value;
2153 }
2154
2155 static void set_value_for_expression(const expression_t *expression,
2156                                      ir_node *value)
2157 {
2158         set_value_for_expression_addr(expression, value, NULL);
2159 }
2160
2161 static ir_node *get_value_from_lvalue(const expression_t *expression,
2162                                       ir_node *addr)
2163 {
2164         if (expression->kind == EXPR_REFERENCE) {
2165                 const reference_expression_t *ref = &expression->reference;
2166
2167                 entity_t *entity = ref->entity;
2168                 assert(entity->kind == ENTITY_VARIABLE
2169                                 || entity->kind == ENTITY_PARAMETER);
2170                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2171                 int value_number;
2172                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE) {
2173                         value_number = entity->variable.v.value_number;
2174                         assert(addr == NULL);
2175                         type_t  *type = skip_typeref(expression->base.type);
2176                         ir_mode *mode = get_ir_mode_storage(type);
2177                         ir_node *res  = get_value(value_number, mode);
2178                         return create_conv(NULL, res, get_ir_mode_arithmetic(type));
2179                 } else if (entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
2180                         value_number = entity->parameter.v.value_number;
2181                         assert(addr == NULL);
2182                         type_t  *type = skip_typeref(expression->base.type);
2183                         ir_mode *mode = get_ir_mode_storage(type);
2184                         ir_node *res  = get_value(value_number, mode);
2185                         return create_conv(NULL, res, get_ir_mode_arithmetic(type));
2186                 }
2187         }
2188
2189         assert(addr != NULL);
2190         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2191
2192         ir_node *value;
2193         if (expression->kind == EXPR_SELECT &&
2194             expression->select.compound_entry->compound_member.bitfield) {
2195             construct_select_compound(&expression->select);
2196                 value = bitfield_extract_to_firm(&expression->select, addr);
2197         } else {
2198                 value = deref_address(dbgi, expression->base.type, addr);
2199         }
2200
2201         return value;
2202 }
2203
2204
2205 static ir_node *create_incdec(const unary_expression_t *expression)
2206 {
2207         dbg_info *const     dbgi = get_dbg_info(&expression->base.source_position);
2208         const expression_t *value_expr = expression->value;
2209         ir_node            *addr       = expression_to_addr(value_expr);
2210         ir_node            *value      = get_value_from_lvalue(value_expr, addr);
2211
2212         type_t  *type = skip_typeref(expression->base.type);
2213         ir_mode *mode = get_ir_mode_arithmetic(expression->base.type);
2214
2215         ir_node *offset;
2216         if (is_type_pointer(type)) {
2217                 pointer_type_t *pointer_type = &type->pointer;
2218                 offset = get_type_size_node(pointer_type->points_to);
2219         } else {
2220                 assert(is_type_arithmetic(type));
2221                 offset = new_Const(get_mode_one(mode));
2222         }
2223
2224         ir_node *result;
2225         ir_node *store_value;
2226         switch(expression->base.kind) {
2227         case EXPR_UNARY_POSTFIX_INCREMENT:
2228                 result      = value;
2229                 store_value = new_d_Add(dbgi, value, offset, mode);
2230                 break;
2231         case EXPR_UNARY_POSTFIX_DECREMENT:
2232                 result      = value;
2233                 store_value = new_d_Sub(dbgi, value, offset, mode);
2234                 break;
2235         case EXPR_UNARY_PREFIX_INCREMENT:
2236                 result      = new_d_Add(dbgi, value, offset, mode);
2237                 store_value = result;
2238                 break;
2239         case EXPR_UNARY_PREFIX_DECREMENT:
2240                 result      = new_d_Sub(dbgi, value, offset, mode);
2241                 store_value = result;
2242                 break;
2243         default:
2244                 panic("no incdec expr in create_incdec");
2245         }
2246
2247         set_value_for_expression_addr(value_expr, store_value, addr);
2248
2249         return result;
2250 }
2251
2252 static bool is_local_variable(expression_t *expression)
2253 {
2254         if (expression->kind != EXPR_REFERENCE)
2255                 return false;
2256         reference_expression_t *ref_expr = &expression->reference;
2257         entity_t               *entity   = ref_expr->entity;
2258         if (entity->kind != ENTITY_VARIABLE)
2259                 return false;
2260         assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2261         return entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE;
2262 }
2263
2264 static ir_relation get_relation(const expression_kind_t kind)
2265 {
2266         switch(kind) {
2267         case EXPR_BINARY_EQUAL:         return ir_relation_equal;
2268         case EXPR_BINARY_ISLESSGREATER: return ir_relation_less_greater;
2269         case EXPR_BINARY_NOTEQUAL:      return ir_relation_unordered_less_greater;
2270         case EXPR_BINARY_ISLESS:
2271         case EXPR_BINARY_LESS:          return ir_relation_less;
2272         case EXPR_BINARY_ISLESSEQUAL:
2273         case EXPR_BINARY_LESSEQUAL:     return ir_relation_less_equal;
2274         case EXPR_BINARY_ISGREATER:
2275         case EXPR_BINARY_GREATER:       return ir_relation_greater;
2276         case EXPR_BINARY_ISGREATEREQUAL:
2277         case EXPR_BINARY_GREATEREQUAL:  return ir_relation_greater_equal;
2278         case EXPR_BINARY_ISUNORDERED:   return ir_relation_unordered;
2279
2280         default:
2281                 break;
2282         }
2283         panic("trying to get pn_Cmp from non-comparison binexpr type");
2284 }
2285
2286 /**
2287  * Handle the assume optimizer hint: check if a Confirm
2288  * node can be created.
2289  *
2290  * @param dbi    debug info
2291  * @param expr   the IL assume expression
2292  *
2293  * we support here only some simple cases:
2294  *  - var rel const
2295  *  - const rel val
2296  *  - var rel var
2297  */
2298 static ir_node *handle_assume_compare(dbg_info *dbi,
2299                                       const binary_expression_t *expression)
2300 {
2301         expression_t *op1 = expression->left;
2302         expression_t *op2 = expression->right;
2303         entity_t     *var2, *var = NULL;
2304         ir_node      *res      = NULL;
2305         ir_relation   relation = get_relation(expression->base.kind);
2306
2307         if (is_local_variable(op1) && is_local_variable(op2)) {
2308                 var  = op1->reference.entity;
2309             var2 = op2->reference.entity;
2310
2311                 type_t  *const type = skip_typeref(var->declaration.type);
2312                 ir_mode *const mode = get_ir_mode_storage(type);
2313
2314                 ir_node *const irn1 = get_value(var->variable.v.value_number, mode);
2315                 ir_node *const irn2 = get_value(var2->variable.v.value_number, mode);
2316
2317                 res = new_d_Confirm(dbi, irn2, irn1, get_inversed_relation(relation));
2318                 set_value(var2->variable.v.value_number, res);
2319
2320                 res = new_d_Confirm(dbi, irn1, irn2, relation);
2321                 set_value(var->variable.v.value_number, res);
2322
2323                 return res;
2324         }
2325
2326         expression_t *con = NULL;
2327         if (is_local_variable(op1) && is_constant_expression(op2) == EXPR_CLASS_CONSTANT) {
2328                 var = op1->reference.entity;
2329                 con = op2;
2330         } else if (is_constant_expression(op1) == EXPR_CLASS_CONSTANT && is_local_variable(op2)) {
2331                 relation = get_inversed_relation(relation);
2332                 var = op2->reference.entity;
2333                 con = op1;
2334         }
2335
2336         if (var != NULL) {
2337                 type_t  *const type = skip_typeref(var->declaration.type);
2338                 ir_mode *const mode = get_ir_mode_storage(type);
2339
2340                 res = get_value(var->variable.v.value_number, mode);
2341                 res = new_d_Confirm(dbi, res, expression_to_firm(con), relation);
2342                 set_value(var->variable.v.value_number, res);
2343         }
2344         return res;
2345 }
2346
2347 /**
2348  * Handle the assume optimizer hint.
2349  *
2350  * @param dbi    debug info
2351  * @param expr   the IL assume expression
2352  */
2353 static ir_node *handle_assume(dbg_info *dbi, const expression_t *expression)
2354 {
2355         switch(expression->kind) {
2356         case EXPR_BINARY_EQUAL:
2357         case EXPR_BINARY_NOTEQUAL:
2358         case EXPR_BINARY_LESS:
2359         case EXPR_BINARY_LESSEQUAL:
2360         case EXPR_BINARY_GREATER:
2361         case EXPR_BINARY_GREATEREQUAL:
2362                 return handle_assume_compare(dbi, &expression->binary);
2363         default:
2364                 return NULL;
2365         }
2366 }
2367
2368 static ir_node *create_cast(dbg_info *dbgi, ir_node *value_node,
2369                             type_t *from_type, type_t *type)
2370 {
2371         type = skip_typeref(type);
2372         if (is_type_void(type)) {
2373                 /* make sure firm type is constructed */
2374                 (void) get_ir_type(type);
2375                 return NULL;
2376         }
2377         if (!is_type_scalar(type)) {
2378                 /* make sure firm type is constructed */
2379                 (void) get_ir_type(type);
2380                 return value_node;
2381         }
2382
2383         from_type     = skip_typeref(from_type);
2384         ir_mode *mode = get_ir_mode_storage(type);
2385         /* check for conversion from / to __based types */
2386         if (is_type_pointer(type) && is_type_pointer(from_type)) {
2387                 const variable_t *from_var = from_type->pointer.base_variable;
2388                 const variable_t *to_var   = type->pointer.base_variable;
2389                 if (from_var != to_var) {
2390                         if (from_var != NULL) {
2391                                 ir_node *const addr = create_symconst(dbgi, from_var->v.entity);
2392                                 ir_node *const base = deref_address(dbgi, from_var->base.type, addr);
2393                                 value_node = new_d_Add(dbgi, value_node, base, get_ir_mode_storage(from_type));
2394                         }
2395                         if (to_var != NULL) {
2396                                 ir_node *const addr = create_symconst(dbgi, to_var->v.entity);
2397                                 ir_node *const base = deref_address(dbgi, to_var->base.type, addr);
2398                                 value_node = new_d_Sub(dbgi, value_node, base, mode);
2399                         }
2400                 }
2401         }
2402
2403         if (is_type_atomic(type, ATOMIC_TYPE_BOOL)) {
2404                 /* bool adjustments (we save a mode_Bu, but have to temporarily
2405                  * convert to mode_b so we only get a 0/1 value */
2406                 value_node = create_conv(dbgi, value_node, mode_b);
2407         }
2408
2409         ir_mode *mode_arith = get_ir_mode_arithmetic(type);
2410         ir_node *node       = create_conv(dbgi, value_node, mode);
2411         node                = do_strict_conv(dbgi, node);
2412         node                = create_conv(dbgi, node, mode_arith);
2413
2414         return node;
2415 }
2416
2417 static ir_node *unary_expression_to_firm(const unary_expression_t *expression)
2418 {
2419         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2420         type_t   *type = skip_typeref(expression->base.type);
2421
2422         const expression_t *value = expression->value;
2423
2424         switch(expression->base.kind) {
2425         case EXPR_UNARY_TAKE_ADDRESS:
2426                 return expression_to_addr(value);
2427
2428         case EXPR_UNARY_NEGATE: {
2429                 ir_node *value_node = expression_to_firm(value);
2430                 ir_mode *mode       = get_ir_mode_arithmetic(type);
2431                 return new_d_Minus(dbgi, value_node, mode);
2432         }
2433         case EXPR_UNARY_PLUS:
2434                 return expression_to_firm(value);
2435         case EXPR_UNARY_BITWISE_NEGATE: {
2436                 ir_node *value_node = expression_to_firm(value);
2437                 ir_mode *mode       = get_ir_mode_arithmetic(type);
2438                 return new_d_Not(dbgi, value_node, mode);
2439         }
2440         case EXPR_UNARY_NOT: {
2441                 ir_node *value_node = _expression_to_firm(value);
2442                 value_node          = create_conv(dbgi, value_node, mode_b);
2443                 ir_node *res        = new_d_Not(dbgi, value_node, mode_b);
2444                 return res;
2445         }
2446         case EXPR_UNARY_DEREFERENCE: {
2447                 ir_node *value_node = expression_to_firm(value);
2448                 type_t  *value_type = skip_typeref(value->base.type);
2449                 assert(is_type_pointer(value_type));
2450
2451                 /* check for __based */
2452                 const variable_t *const base_var = value_type->pointer.base_variable;
2453                 if (base_var != NULL) {
2454                         ir_node *const addr = create_symconst(dbgi, base_var->v.entity);
2455                         ir_node *const base = deref_address(dbgi, base_var->base.type, addr);
2456                         value_node = new_d_Add(dbgi, value_node, base, get_ir_mode_storage(value_type));
2457                 }
2458                 type_t  *points_to  = value_type->pointer.points_to;
2459                 return deref_address(dbgi, points_to, value_node);
2460         }
2461         case EXPR_UNARY_POSTFIX_INCREMENT:
2462         case EXPR_UNARY_POSTFIX_DECREMENT:
2463         case EXPR_UNARY_PREFIX_INCREMENT:
2464         case EXPR_UNARY_PREFIX_DECREMENT:
2465                 return create_incdec(expression);
2466         case EXPR_UNARY_CAST: {
2467                 ir_node *value_node = expression_to_firm(value);
2468                 type_t  *from_type  = value->base.type;
2469                 return create_cast(dbgi, value_node, from_type, type);
2470         }
2471         case EXPR_UNARY_ASSUME:
2472                 return handle_assume(dbgi, value);
2473
2474         default:
2475                 break;
2476         }
2477         panic("invalid UNEXPR type found");
2478 }
2479
2480 /**
2481  * produces a 0/1 depending of the value of a mode_b node
2482  */
2483 static ir_node *produce_condition_result(const expression_t *expression,
2484                                          ir_mode *mode, dbg_info *dbgi)
2485 {
2486         ir_node *const one_block  = new_immBlock();
2487         ir_node *const zero_block = new_immBlock();
2488         create_condition_evaluation(expression, one_block, zero_block);
2489         mature_immBlock(one_block);
2490         mature_immBlock(zero_block);
2491
2492         ir_node *const jmp_one  = new_rd_Jmp(dbgi, one_block);
2493         ir_node *const jmp_zero = new_rd_Jmp(dbgi, zero_block);
2494         ir_node *const in_cf[2] = { jmp_one, jmp_zero };
2495         ir_node *const block    = new_Block(lengthof(in_cf), in_cf);
2496         set_cur_block(block);
2497
2498         ir_node *const one   = new_Const(get_mode_one(mode));
2499         ir_node *const zero  = new_Const(get_mode_null(mode));
2500         ir_node *const in[2] = { one, zero };
2501         ir_node *const val   = new_d_Phi(dbgi, lengthof(in), in, mode);
2502
2503         return val;
2504 }
2505
2506 static ir_node *adjust_for_pointer_arithmetic(dbg_info *dbgi,
2507                 ir_node *value, type_t *type)
2508 {
2509         ir_mode        *const mode         = get_ir_mode_arithmetic(type_ptrdiff_t);
2510         assert(is_type_pointer(type));
2511         pointer_type_t *const pointer_type = &type->pointer;
2512         type_t         *const points_to    = skip_typeref(pointer_type->points_to);
2513         ir_node        *      elem_size    = get_type_size_node(points_to);
2514         elem_size                          = create_conv(dbgi, elem_size, mode);
2515         value                              = create_conv(dbgi, value,     mode);
2516         ir_node        *const mul          = new_d_Mul(dbgi, value, elem_size, mode);
2517         return mul;
2518 }
2519
2520 static ir_node *create_op(dbg_info *dbgi, const binary_expression_t *expression,
2521                           ir_node *left, ir_node *right)
2522 {
2523         ir_mode  *mode;
2524         type_t   *type_left  = skip_typeref(expression->left->base.type);
2525         type_t   *type_right = skip_typeref(expression->right->base.type);
2526
2527         expression_kind_t kind = expression->base.kind;
2528
2529         switch (kind) {
2530         case EXPR_BINARY_SHIFTLEFT:
2531         case EXPR_BINARY_SHIFTRIGHT:
2532         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2533         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2534                 mode  = get_ir_mode_arithmetic(expression->base.type);
2535                 right = create_conv(dbgi, right, atomic_modes[ATOMIC_TYPE_UINT]);
2536                 break;
2537
2538         case EXPR_BINARY_SUB:
2539                 if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
2540                         const pointer_type_t *const ptr_type = &type_left->pointer;
2541
2542                         mode = get_ir_mode_arithmetic(expression->base.type);
2543                         ir_node *const elem_size = get_type_size_node(ptr_type->points_to);
2544                         ir_node *const conv_size = new_d_Conv(dbgi, elem_size, mode);
2545                         ir_node *const sub       = new_d_Sub(dbgi, left, right, mode);
2546                         ir_node *const no_mem    = new_NoMem();
2547                         ir_node *const div       = new_d_DivRL(dbgi, no_mem, sub, conv_size,
2548                                                                                                    mode, op_pin_state_floats);
2549                         return new_d_Proj(dbgi, div, mode, pn_Div_res);
2550                 }
2551                 /* fallthrough */
2552         case EXPR_BINARY_SUB_ASSIGN:
2553                 if (is_type_pointer(type_left)) {
2554                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2555                         mode  = get_ir_mode_arithmetic(type_left);
2556                         break;
2557                 }
2558                 goto normal_node;
2559
2560         case EXPR_BINARY_ADD:
2561         case EXPR_BINARY_ADD_ASSIGN:
2562                 if (is_type_pointer(type_left)) {
2563                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2564                         mode  = get_ir_mode_arithmetic(type_left);
2565                         break;
2566                 } else if (is_type_pointer(type_right)) {
2567                         left  = adjust_for_pointer_arithmetic(dbgi, left, type_right);
2568                         mode  = get_ir_mode_arithmetic(type_right);
2569                         break;
2570                 }
2571                 goto normal_node;
2572
2573         default:
2574 normal_node:
2575                 mode = get_ir_mode_arithmetic(type_right);
2576                 left = create_conv(dbgi, left, mode);
2577                 break;
2578         }
2579
2580         switch (kind) {
2581         case EXPR_BINARY_ADD_ASSIGN:
2582         case EXPR_BINARY_ADD:
2583                 return new_d_Add(dbgi, left, right, mode);
2584         case EXPR_BINARY_SUB_ASSIGN:
2585         case EXPR_BINARY_SUB:
2586                 return new_d_Sub(dbgi, left, right, mode);
2587         case EXPR_BINARY_MUL_ASSIGN:
2588         case EXPR_BINARY_MUL:
2589                 return new_d_Mul(dbgi, left, right, mode);
2590         case EXPR_BINARY_BITWISE_AND:
2591         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2592                 return new_d_And(dbgi, left, right, mode);
2593         case EXPR_BINARY_BITWISE_OR:
2594         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2595                 return new_d_Or(dbgi, left, right, mode);
2596         case EXPR_BINARY_BITWISE_XOR:
2597         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2598                 return new_d_Eor(dbgi, left, right, mode);
2599         case EXPR_BINARY_SHIFTLEFT:
2600         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2601                 return new_d_Shl(dbgi, left, right, mode);
2602         case EXPR_BINARY_SHIFTRIGHT:
2603         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2604                 if (mode_is_signed(mode)) {
2605                         return new_d_Shrs(dbgi, left, right, mode);
2606                 } else {
2607                         return new_d_Shr(dbgi, left, right, mode);
2608                 }
2609         case EXPR_BINARY_DIV:
2610         case EXPR_BINARY_DIV_ASSIGN: {
2611                 ir_node *pin = new_Pin(new_NoMem());
2612                 ir_node *op  = new_d_Div(dbgi, pin, left, right, mode,
2613                                          op_pin_state_floats);
2614                 ir_node *res = new_d_Proj(dbgi, op, mode, pn_Div_res);
2615                 return res;
2616         }
2617         case EXPR_BINARY_MOD:
2618         case EXPR_BINARY_MOD_ASSIGN: {
2619                 ir_node *pin = new_Pin(new_NoMem());
2620                 assert(!mode_is_float(mode));
2621                 ir_node *op  = new_d_Mod(dbgi, pin, left, right, mode,
2622                                          op_pin_state_floats);
2623                 ir_node *res = new_d_Proj(dbgi, op, mode, pn_Mod_res);
2624                 return res;
2625         }
2626         default:
2627                 panic("unexpected expression kind");
2628         }
2629 }
2630
2631 static ir_node *create_lazy_op(const binary_expression_t *expression)
2632 {
2633         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2634         type_t   *type = skip_typeref(expression->base.type);
2635         ir_mode  *mode = get_ir_mode_arithmetic(type);
2636
2637         if (is_constant_expression(expression->left) == EXPR_CLASS_CONSTANT) {
2638                 bool val = fold_constant_to_bool(expression->left);
2639                 expression_kind_t ekind = expression->base.kind;
2640                 assert(ekind == EXPR_BINARY_LOGICAL_AND || ekind == EXPR_BINARY_LOGICAL_OR);
2641                 if (ekind == EXPR_BINARY_LOGICAL_AND) {
2642                         if (!val) {
2643                                 return new_Const(get_mode_null(mode));
2644                         }
2645                 } else {
2646                         if (val) {
2647                                 return new_Const(get_mode_one(mode));
2648                         }
2649                 }
2650
2651                 if (is_constant_expression(expression->right) == EXPR_CLASS_CONSTANT) {
2652                         bool valr = fold_constant_to_bool(expression->right);
2653                         return create_Const_from_bool(mode, valr);
2654                 }
2655
2656                 return produce_condition_result(expression->right, mode, dbgi);
2657         }
2658
2659         return produce_condition_result((const expression_t*) expression, mode,
2660                                         dbgi);
2661 }
2662
2663 typedef ir_node * (*create_arithmetic_func)(dbg_info *dbgi, ir_node *left,
2664                                             ir_node *right, ir_mode *mode);
2665
2666 static ir_node *create_assign_binop(const binary_expression_t *expression)
2667 {
2668         dbg_info *const     dbgi = get_dbg_info(&expression->base.source_position);
2669         const expression_t *left_expr = expression->left;
2670         type_t             *type      = skip_typeref(left_expr->base.type);
2671         ir_node            *right     = expression_to_firm(expression->right);
2672         ir_node            *left_addr = expression_to_addr(left_expr);
2673         ir_node            *left      = get_value_from_lvalue(left_expr, left_addr);
2674         ir_node            *result    = create_op(dbgi, expression, left, right);
2675
2676         result = create_cast(dbgi, result, expression->right->base.type, type);
2677         result = do_strict_conv(dbgi, result);
2678
2679         result = set_value_for_expression_addr(left_expr, result, left_addr);
2680
2681         if (!is_type_compound(type)) {
2682                 ir_mode *mode_arithmetic = get_ir_mode_arithmetic(type);
2683                 result = create_conv(dbgi, result, mode_arithmetic);
2684         }
2685         return result;
2686 }
2687
2688 static ir_node *binary_expression_to_firm(const binary_expression_t *expression)
2689 {
2690         expression_kind_t kind = expression->base.kind;
2691
2692         switch(kind) {
2693         case EXPR_BINARY_EQUAL:
2694         case EXPR_BINARY_NOTEQUAL:
2695         case EXPR_BINARY_LESS:
2696         case EXPR_BINARY_LESSEQUAL:
2697         case EXPR_BINARY_GREATER:
2698         case EXPR_BINARY_GREATEREQUAL:
2699         case EXPR_BINARY_ISGREATER:
2700         case EXPR_BINARY_ISGREATEREQUAL:
2701         case EXPR_BINARY_ISLESS:
2702         case EXPR_BINARY_ISLESSEQUAL:
2703         case EXPR_BINARY_ISLESSGREATER:
2704         case EXPR_BINARY_ISUNORDERED: {
2705                 dbg_info   *dbgi     = get_dbg_info(&expression->base.source_position);
2706                 ir_node    *left     = expression_to_firm(expression->left);
2707                 ir_node    *right    = expression_to_firm(expression->right);
2708                 ir_relation relation = get_relation(kind);
2709                 ir_node    *cmp      = new_d_Cmp(dbgi, left, right, relation);
2710                 return cmp;
2711         }
2712         case EXPR_BINARY_ASSIGN: {
2713                 ir_node *addr  = expression_to_addr(expression->left);
2714                 ir_node *right = expression_to_firm(expression->right);
2715                 ir_node *res
2716                         = set_value_for_expression_addr(expression->left, right, addr);
2717
2718                 type_t  *type            = skip_typeref(expression->base.type);
2719                 if (!is_type_compound(type)) {
2720                         ir_mode *mode_arithmetic = get_ir_mode_arithmetic(type);
2721                         res                      = create_conv(NULL, res, mode_arithmetic);
2722                 }
2723                 return res;
2724         }
2725         case EXPR_BINARY_ADD:
2726         case EXPR_BINARY_SUB:
2727         case EXPR_BINARY_MUL:
2728         case EXPR_BINARY_DIV:
2729         case EXPR_BINARY_MOD:
2730         case EXPR_BINARY_BITWISE_AND:
2731         case EXPR_BINARY_BITWISE_OR:
2732         case EXPR_BINARY_BITWISE_XOR:
2733         case EXPR_BINARY_SHIFTLEFT:
2734         case EXPR_BINARY_SHIFTRIGHT:
2735         {
2736                 dbg_info *dbgi  = get_dbg_info(&expression->base.source_position);
2737                 ir_node  *left  = expression_to_firm(expression->left);
2738                 ir_node  *right = expression_to_firm(expression->right);
2739                 return create_op(dbgi, expression, left, right);
2740         }
2741         case EXPR_BINARY_LOGICAL_AND:
2742         case EXPR_BINARY_LOGICAL_OR:
2743                 return create_lazy_op(expression);
2744         case EXPR_BINARY_COMMA:
2745                 /* create side effects of left side */
2746                 (void) expression_to_firm(expression->left);
2747                 return _expression_to_firm(expression->right);
2748
2749         case EXPR_BINARY_ADD_ASSIGN:
2750         case EXPR_BINARY_SUB_ASSIGN:
2751         case EXPR_BINARY_MUL_ASSIGN:
2752         case EXPR_BINARY_MOD_ASSIGN:
2753         case EXPR_BINARY_DIV_ASSIGN:
2754         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2755         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2756         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2757         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2758         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2759                 return create_assign_binop(expression);
2760         default:
2761                 panic("TODO binexpr type");
2762         }
2763 }
2764
2765 static ir_node *array_access_addr(const array_access_expression_t *expression)
2766 {
2767         dbg_info *dbgi        = get_dbg_info(&expression->base.source_position);
2768         ir_node  *base_addr   = expression_to_firm(expression->array_ref);
2769         ir_node  *offset      = expression_to_firm(expression->index);
2770         type_t   *ref_type    = skip_typeref(expression->array_ref->base.type);
2771         ir_node  *real_offset = adjust_for_pointer_arithmetic(dbgi, offset, ref_type);
2772         ir_node  *result      = new_d_Add(dbgi, base_addr, real_offset, mode_P_data);
2773
2774         return result;
2775 }
2776
2777 static ir_node *array_access_to_firm(
2778                 const array_access_expression_t *expression)
2779 {
2780         dbg_info *dbgi   = get_dbg_info(&expression->base.source_position);
2781         ir_node  *addr   = array_access_addr(expression);
2782         type_t   *type   = revert_automatic_type_conversion(
2783                         (const expression_t*) expression);
2784         type             = skip_typeref(type);
2785
2786         return deref_address(dbgi, type, addr);
2787 }
2788
2789 static long get_offsetof_offset(const offsetof_expression_t *expression)
2790 {
2791         type_t *orig_type = expression->type;
2792         long    offset    = 0;
2793
2794         designator_t *designator = expression->designator;
2795         for ( ; designator != NULL; designator = designator->next) {
2796                 type_t *type = skip_typeref(orig_type);
2797                 /* be sure the type is constructed */
2798                 (void) get_ir_type(type);
2799
2800                 if (designator->symbol != NULL) {
2801                         assert(is_type_compound(type));
2802                         symbol_t *symbol = designator->symbol;
2803
2804                         compound_t *compound = type->compound.compound;
2805                         entity_t   *iter     = compound->members.entities;
2806                         for ( ; iter != NULL; iter = iter->base.next) {
2807                                 if (iter->base.symbol == symbol) {
2808                                         break;
2809                                 }
2810                         }
2811                         assert(iter != NULL);
2812
2813                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
2814                         assert(iter->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
2815                         offset += get_entity_offset(iter->compound_member.entity);
2816
2817                         orig_type = iter->declaration.type;
2818                 } else {
2819                         expression_t *array_index = designator->array_index;
2820                         assert(designator->array_index != NULL);
2821                         assert(is_type_array(type));
2822
2823                         long index         = fold_constant_to_int(array_index);
2824                         ir_type *arr_type  = get_ir_type(type);
2825                         ir_type *elem_type = get_array_element_type(arr_type);
2826                         long     elem_size = get_type_size_bytes(elem_type);
2827
2828                         offset += index * elem_size;
2829
2830                         orig_type = type->array.element_type;
2831                 }
2832         }
2833
2834         return offset;
2835 }
2836
2837 static ir_node *offsetof_to_firm(const offsetof_expression_t *expression)
2838 {
2839         ir_mode   *mode   = get_ir_mode_arithmetic(expression->base.type);
2840         long       offset = get_offsetof_offset(expression);
2841         ir_tarval *tv     = new_tarval_from_long(offset, mode);
2842         dbg_info  *dbgi   = get_dbg_info(&expression->base.source_position);
2843
2844         return new_d_Const(dbgi, tv);
2845 }
2846
2847 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
2848                                      ir_entity *entity, type_t *type);
2849 static ir_initializer_t *create_ir_initializer(
2850                 const initializer_t *initializer, type_t *type);
2851
2852 static ir_entity *create_initializer_entity(dbg_info *dbgi,
2853                                             initializer_t *initializer,
2854                                             type_t *type)
2855 {
2856         /* create the ir_initializer */
2857         ir_graph *const old_current_ir_graph = current_ir_graph;
2858         current_ir_graph = get_const_code_irg();
2859
2860         ir_initializer_t *irinitializer = create_ir_initializer(initializer, type);
2861
2862         assert(current_ir_graph == get_const_code_irg());
2863         current_ir_graph = old_current_ir_graph;
2864
2865         ident     *const id          = id_unique("initializer.%u");
2866         ir_type   *const irtype      = get_ir_type(type);
2867         ir_type   *const global_type = get_glob_type();
2868         ir_entity *const entity      = new_d_entity(global_type, id, irtype, dbgi);
2869         set_entity_ld_ident(entity, id);
2870         set_entity_visibility(entity, ir_visibility_private);
2871         add_entity_linkage(entity, IR_LINKAGE_CONSTANT);
2872         set_entity_initializer(entity, irinitializer);
2873         return entity;
2874 }
2875
2876 static ir_node *compound_literal_addr(compound_literal_expression_t const *const expression)
2877 {
2878         dbg_info      *dbgi        = get_dbg_info(&expression->base.source_position);
2879         type_t        *type        = expression->type;
2880         initializer_t *initializer = expression->initializer;
2881
2882         if (is_constant_initializer(initializer) == EXPR_CLASS_CONSTANT) {
2883                 ir_entity *entity = create_initializer_entity(dbgi, initializer, type);
2884                 return create_symconst(dbgi, entity);
2885         } else {
2886                 /* create an entity on the stack */
2887                 ident   *const id     = id_unique("CompLit.%u");
2888                 ir_type *const irtype = get_ir_type(type);
2889                 ir_type *frame_type   = get_irg_frame_type(current_ir_graph);
2890
2891                 ir_entity *const entity = new_d_entity(frame_type, id, irtype, dbgi);
2892                 set_entity_ld_ident(entity, id);
2893
2894                 /* create initialisation code */
2895                 create_local_initializer(initializer, dbgi, entity, type);
2896
2897                 /* create a sel for the compound literal address */
2898                 ir_node *frame = get_irg_frame(current_ir_graph);
2899                 ir_node *sel   = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
2900                 return sel;
2901         }
2902 }
2903
2904 static ir_node *compound_literal_to_firm(compound_literal_expression_t const* const expr)
2905 {
2906         dbg_info *const dbgi = get_dbg_info(&expr->base.source_position);
2907         type_t   *const type = expr->type;
2908         ir_node  *const addr = compound_literal_addr(expr);
2909         return deref_address(dbgi, type, addr);
2910 }
2911
2912 /**
2913  * Transform a sizeof expression into Firm code.
2914  */
2915 static ir_node *sizeof_to_firm(const typeprop_expression_t *expression)
2916 {
2917         type_t *const type = skip_typeref(expression->type);
2918         /* §6.5.3.4:2 if the type is a VLA, evaluate the expression. */
2919         if (is_type_array(type) && type->array.is_vla
2920                         && expression->tp_expression != NULL) {
2921                 expression_to_firm(expression->tp_expression);
2922         }
2923         /* strange gnu extensions: sizeof(function) == 1 */
2924         if (is_type_function(type)) {
2925                 ir_mode *mode = get_ir_mode_storage(type_size_t);
2926                 return new_Const(get_mode_one(mode));
2927         }
2928
2929         return get_type_size_node(type);
2930 }
2931
2932 static entity_t *get_expression_entity(const expression_t *expression)
2933 {
2934         if (expression->kind != EXPR_REFERENCE)
2935                 return NULL;
2936
2937         return expression->reference.entity;
2938 }
2939
2940 static unsigned get_cparser_entity_alignment(const entity_t *entity)
2941 {
2942         switch(entity->kind) {
2943         case DECLARATION_KIND_CASES:
2944                 return entity->declaration.alignment;
2945         case ENTITY_STRUCT:
2946         case ENTITY_UNION:
2947                 return entity->compound.alignment;
2948         case ENTITY_TYPEDEF:
2949                 return entity->typedefe.alignment;
2950         default:
2951                 break;
2952         }
2953         return 0;
2954 }
2955
2956 /**
2957  * Transform an alignof expression into Firm code.
2958  */
2959 static ir_node *alignof_to_firm(const typeprop_expression_t *expression)
2960 {
2961         unsigned alignment = 0;
2962
2963         const expression_t *tp_expression = expression->tp_expression;
2964         if (tp_expression != NULL) {
2965                 entity_t *entity = get_expression_entity(tp_expression);
2966                 if (entity != NULL) {
2967                         if (entity->kind == ENTITY_FUNCTION) {
2968                                 /* a gnu-extension */
2969                                 alignment = 1;
2970                         } else {
2971                                 alignment = get_cparser_entity_alignment(entity);
2972                         }
2973                 }
2974         }
2975
2976         if (alignment == 0) {
2977                 type_t *type = expression->type;
2978                 alignment = get_type_alignment(type);
2979         }
2980
2981         dbg_info  *dbgi = get_dbg_info(&expression->base.source_position);
2982         ir_mode   *mode = get_ir_mode_arithmetic(expression->base.type);
2983         ir_tarval *tv   = new_tarval_from_long(alignment, mode);
2984         return new_d_Const(dbgi, tv);
2985 }
2986
2987 static void init_ir_types(void);
2988
2989 static ir_tarval *fold_constant_to_tarval(const expression_t *expression)
2990 {
2991         assert(is_constant_expression(expression) == EXPR_CLASS_CONSTANT);
2992
2993         bool constant_folding_old = constant_folding;
2994         constant_folding = true;
2995         int old_optimize         = get_optimize();
2996         int old_constant_folding = get_opt_constant_folding();
2997         set_optimize(1);
2998         set_opt_constant_folding(1);
2999
3000         init_ir_types();
3001
3002         ir_graph *old_current_ir_graph = current_ir_graph;
3003         current_ir_graph = get_const_code_irg();
3004
3005         ir_node *cnst = expression_to_firm(expression);
3006         current_ir_graph = old_current_ir_graph;
3007         set_optimize(old_optimize);
3008         set_opt_constant_folding(old_constant_folding);
3009
3010         if (!is_Const(cnst)) {
3011                 panic("couldn't fold constant");
3012         }
3013
3014         constant_folding = constant_folding_old;
3015
3016         return get_Const_tarval(cnst);
3017 }
3018
3019 /* this function is only used in parser.c, but it relies on libfirm functionality */
3020 bool constant_is_negative(const expression_t *expression)
3021 {
3022         ir_tarval *tv = fold_constant_to_tarval(expression);
3023         return tarval_is_negative(tv);
3024 }
3025
3026 long fold_constant_to_int(const expression_t *expression)
3027 {
3028         ir_tarval *tv = fold_constant_to_tarval(expression);
3029         if (!tarval_is_long(tv)) {
3030                 panic("result of constant folding is not integer");
3031         }
3032
3033         return get_tarval_long(tv);
3034 }
3035
3036 bool fold_constant_to_bool(const expression_t *expression)
3037 {
3038         ir_tarval *tv = fold_constant_to_tarval(expression);
3039         return !tarval_is_null(tv);
3040 }
3041
3042 static ir_node *conditional_to_firm(const conditional_expression_t *expression)
3043 {
3044         dbg_info *const dbgi = get_dbg_info(&expression->base.source_position);
3045
3046         /* first try to fold a constant condition */
3047         if (is_constant_expression(expression->condition) == EXPR_CLASS_CONSTANT) {
3048                 bool val = fold_constant_to_bool(expression->condition);
3049                 if (val) {
3050                         expression_t *true_expression = expression->true_expression;
3051                         if (true_expression == NULL)
3052                                 true_expression = expression->condition;
3053                         return expression_to_firm(true_expression);
3054                 } else {
3055                         return expression_to_firm(expression->false_expression);
3056                 }
3057         }
3058
3059         ir_node *const true_block  = new_immBlock();
3060         ir_node *const false_block = new_immBlock();
3061         ir_node *const cond_expr   = create_condition_evaluation(expression->condition, true_block, false_block);
3062         mature_immBlock(true_block);
3063         mature_immBlock(false_block);
3064
3065         set_cur_block(true_block);
3066         ir_node *true_val;
3067         if (expression->true_expression != NULL) {
3068                 true_val = expression_to_firm(expression->true_expression);
3069         } else if (cond_expr != NULL && get_irn_mode(cond_expr) != mode_b) {
3070                 true_val = cond_expr;
3071         } else {
3072                 /* Condition ended with a short circuit (&&, ||, !) operation or a
3073                  * comparison.  Generate a "1" as value for the true branch. */
3074                 true_val = new_Const(get_mode_one(mode_Is));
3075         }
3076         ir_node *const true_jmp = new_d_Jmp(dbgi);
3077
3078         set_cur_block(false_block);
3079         ir_node *const false_val = expression_to_firm(expression->false_expression);
3080         ir_node *const false_jmp = new_d_Jmp(dbgi);
3081
3082         /* create the common block */
3083         ir_node *const in_cf[2] = { true_jmp, false_jmp };
3084         ir_node *const block    = new_Block(lengthof(in_cf), in_cf);
3085         set_cur_block(block);
3086
3087         /* TODO improve static semantics, so either both or no values are NULL */
3088         if (true_val == NULL || false_val == NULL)
3089                 return NULL;
3090
3091         ir_node *const in[2] = { true_val, false_val };
3092         type_t  *const type  = skip_typeref(expression->base.type);
3093         ir_mode *mode;
3094         if (is_type_compound(type)) {
3095                 mode = mode_P;
3096         } else {
3097                 mode = get_ir_mode_arithmetic(type);
3098         }
3099         ir_node *const val   = new_d_Phi(dbgi, lengthof(in), in, mode);
3100
3101         return val;
3102 }
3103
3104 /**
3105  * Returns an IR-node representing the address of a field.
3106  */
3107 static ir_node *select_addr(const select_expression_t *expression)
3108 {
3109         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3110
3111         construct_select_compound(expression);
3112
3113         ir_node *compound_addr = expression_to_firm(expression->compound);
3114
3115         entity_t *entry = expression->compound_entry;
3116         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3117         assert(entry->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
3118
3119         if (constant_folding) {
3120                 ir_mode *mode      = get_irn_mode(compound_addr);
3121                 ir_mode *mode_uint = get_reference_mode_unsigned_eq(mode);
3122                 ir_node *ofs       = new_Const_long(mode_uint, entry->compound_member.offset);
3123                 return new_d_Add(dbgi, compound_addr, ofs, mode);
3124         } else {
3125                 ir_entity *irentity = entry->compound_member.entity;
3126                 assert(irentity != NULL);
3127                 return new_d_simpleSel(dbgi, new_NoMem(), compound_addr, irentity);
3128         }
3129 }
3130
3131 static ir_node *select_to_firm(const select_expression_t *expression)
3132 {
3133         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3134         ir_node  *addr = select_addr(expression);
3135         type_t   *type = revert_automatic_type_conversion(
3136                         (const expression_t*) expression);
3137         type           = skip_typeref(type);
3138
3139         entity_t *entry = expression->compound_entry;
3140         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3141
3142         if (entry->compound_member.bitfield) {
3143                 return bitfield_extract_to_firm(expression, addr);
3144         }
3145
3146         return deref_address(dbgi, type, addr);
3147 }
3148
3149 /* Values returned by __builtin_classify_type. */
3150 typedef enum gcc_type_class
3151 {
3152         no_type_class = -1,
3153         void_type_class,
3154         integer_type_class,
3155         char_type_class,
3156         enumeral_type_class,
3157         boolean_type_class,
3158         pointer_type_class,
3159         reference_type_class,
3160         offset_type_class,
3161         real_type_class,
3162         complex_type_class,
3163         function_type_class,
3164         method_type_class,
3165         record_type_class,
3166         union_type_class,
3167         array_type_class,
3168         string_type_class,
3169         set_type_class,
3170         file_type_class,
3171         lang_type_class
3172 } gcc_type_class;
3173
3174 static ir_node *classify_type_to_firm(const classify_type_expression_t *const expr)
3175 {
3176         type_t *type = expr->type_expression->base.type;
3177
3178         /* FIXME gcc returns different values depending on whether compiling C or C++
3179          * e.g. int x[10] is pointer_type_class in C, but array_type_class in C++ */
3180         gcc_type_class tc;
3181         for (;;) {
3182                 type = skip_typeref(type);
3183                 switch (type->kind) {
3184                         case TYPE_ATOMIC: {
3185                                 const atomic_type_t *const atomic_type = &type->atomic;
3186                                 switch (atomic_type->akind) {
3187                                         /* should not be reached */
3188                                         case ATOMIC_TYPE_INVALID:
3189                                                 tc = no_type_class;
3190                                                 goto make_const;
3191
3192                                         /* gcc cannot do that */
3193                                         case ATOMIC_TYPE_VOID:
3194                                                 tc = void_type_class;
3195                                                 goto make_const;
3196
3197                                         case ATOMIC_TYPE_WCHAR_T:   /* gcc handles this as integer */
3198                                         case ATOMIC_TYPE_CHAR:      /* gcc handles this as integer */
3199                                         case ATOMIC_TYPE_SCHAR:     /* gcc handles this as integer */
3200                                         case ATOMIC_TYPE_UCHAR:     /* gcc handles this as integer */
3201                                         case ATOMIC_TYPE_SHORT:
3202                                         case ATOMIC_TYPE_USHORT:
3203                                         case ATOMIC_TYPE_INT:
3204                                         case ATOMIC_TYPE_UINT:
3205                                         case ATOMIC_TYPE_LONG:
3206                                         case ATOMIC_TYPE_ULONG:
3207                                         case ATOMIC_TYPE_LONGLONG:
3208                                         case ATOMIC_TYPE_ULONGLONG:
3209                                         case ATOMIC_TYPE_BOOL:      /* gcc handles this as integer */
3210                                                 tc = integer_type_class;
3211                                                 goto make_const;
3212
3213                                         case ATOMIC_TYPE_FLOAT:
3214                                         case ATOMIC_TYPE_DOUBLE:
3215                                         case ATOMIC_TYPE_LONG_DOUBLE:
3216                                                 tc = real_type_class;
3217                                                 goto make_const;
3218                                 }
3219                                 panic("Unexpected atomic type in classify_type_to_firm().");
3220                         }
3221
3222                         case TYPE_COMPLEX:         tc = complex_type_class; goto make_const;
3223                         case TYPE_IMAGINARY:       tc = complex_type_class; goto make_const;
3224                         case TYPE_ARRAY:           /* gcc handles this as pointer */
3225                         case TYPE_FUNCTION:        /* gcc handles this as pointer */
3226                         case TYPE_POINTER:         tc = pointer_type_class; goto make_const;
3227                         case TYPE_COMPOUND_STRUCT: tc = record_type_class;  goto make_const;
3228                         case TYPE_COMPOUND_UNION:  tc = union_type_class;   goto make_const;
3229
3230                         /* gcc handles this as integer */
3231                         case TYPE_ENUM:            tc = integer_type_class; goto make_const;
3232
3233                         /* gcc classifies the referenced type */
3234                         case TYPE_REFERENCE: type = type->reference.refers_to; continue;
3235
3236                         /* typedef/typeof should be skipped already */
3237                         case TYPE_TYPEDEF:
3238                         case TYPE_TYPEOF:
3239                         case TYPE_ERROR:
3240                                 break;
3241                 }
3242                 panic("unexpected TYPE classify_type_to_firm().");
3243         }
3244
3245 make_const:;
3246         dbg_info  *const dbgi = get_dbg_info(&expr->base.source_position);
3247         ir_mode   *const mode = atomic_modes[ATOMIC_TYPE_INT];
3248         ir_tarval *const tv   = new_tarval_from_long(tc, mode);
3249         return new_d_Const(dbgi, tv);
3250 }
3251
3252 static ir_node *function_name_to_firm(
3253                 const funcname_expression_t *const expr)
3254 {
3255         switch(expr->kind) {
3256         case FUNCNAME_FUNCTION:
3257         case FUNCNAME_PRETTY_FUNCTION:
3258         case FUNCNAME_FUNCDNAME:
3259                 if (current_function_name == NULL) {
3260                         const source_position_t *const src_pos = &expr->base.source_position;
3261                         const char    *name  = current_function_entity->base.symbol->string;
3262                         const string_t string = { name, strlen(name) + 1 };
3263                         current_function_name = string_to_firm(src_pos, "__func__.%u", &string);
3264                 }
3265                 return current_function_name;
3266         case FUNCNAME_FUNCSIG:
3267                 if (current_funcsig == NULL) {
3268                         const source_position_t *const src_pos = &expr->base.source_position;
3269                         ir_entity *ent = get_irg_entity(current_ir_graph);
3270                         const char *const name = get_entity_ld_name(ent);
3271                         const string_t string = { name, strlen(name) + 1 };
3272                         current_funcsig = string_to_firm(src_pos, "__FUNCSIG__.%u", &string);
3273                 }
3274                 return current_funcsig;
3275         }
3276         panic("Unsupported function name");
3277 }
3278
3279 static ir_node *statement_expression_to_firm(const statement_expression_t *expr)
3280 {
3281         statement_t *statement = expr->statement;
3282
3283         assert(statement->kind == STATEMENT_COMPOUND);
3284         return compound_statement_to_firm(&statement->compound);
3285 }
3286
3287 static ir_node *va_start_expression_to_firm(
3288         const va_start_expression_t *const expr)
3289 {
3290         ir_entity *param_ent = current_vararg_entity;
3291         if (param_ent == NULL) {
3292                 size_t   const n           = IR_VA_START_PARAMETER_NUMBER;
3293                 ir_type *const frame_type  = get_irg_frame_type(current_ir_graph);
3294                 ir_type *const param_type  = get_unknown_type();
3295                 param_ent = new_parameter_entity(frame_type, n, param_type);
3296                 current_vararg_entity = param_ent;
3297         }
3298
3299         ir_node  *const frame   = get_irg_frame(current_ir_graph);
3300         dbg_info *const dbgi    = get_dbg_info(&expr->base.source_position);
3301         ir_node  *const no_mem  = new_NoMem();
3302         ir_node  *const arg_sel = new_d_simpleSel(dbgi, no_mem, frame, param_ent);
3303
3304         set_value_for_expression(expr->ap, arg_sel);
3305
3306         return NULL;
3307 }
3308
3309 static ir_node *va_arg_expression_to_firm(const va_arg_expression_t *const expr)
3310 {
3311         type_t       *const type    = expr->base.type;
3312         expression_t *const ap_expr = expr->ap;
3313         ir_node      *const ap_addr = expression_to_addr(ap_expr);
3314         ir_node      *const ap      = get_value_from_lvalue(ap_expr, ap_addr);
3315         dbg_info     *const dbgi    = get_dbg_info(&expr->base.source_position);
3316         ir_node      *const res     = deref_address(dbgi, type, ap);
3317
3318         ir_node      *const cnst    = get_type_size_node(expr->base.type);
3319         ir_mode      *const mode    = get_irn_mode(cnst);
3320         ir_node      *const c1      = new_Const_long(mode, stack_param_align - 1);
3321         ir_node      *const c2      = new_d_Add(dbgi, cnst, c1, mode);
3322         ir_node      *const c3      = new_Const_long(mode, -(long)stack_param_align);
3323         ir_node      *const c4      = new_d_And(dbgi, c2, c3, mode);
3324         ir_node      *const add     = new_d_Add(dbgi, ap, c4, mode_P_data);
3325
3326         set_value_for_expression_addr(ap_expr, add, ap_addr);
3327
3328         return res;
3329 }
3330
3331 /**
3332  * Generate Firm for a va_copy expression.
3333  */
3334 static ir_node *va_copy_expression_to_firm(const va_copy_expression_t *const expr)
3335 {
3336         ir_node *const src = expression_to_firm(expr->src);
3337         set_value_for_expression(expr->dst, src);
3338         return NULL;
3339 }
3340
3341 static ir_node *dereference_addr(const unary_expression_t *const expression)
3342 {
3343         assert(expression->base.kind == EXPR_UNARY_DEREFERENCE);
3344         return expression_to_firm(expression->value);
3345 }
3346
3347 /**
3348  * Returns a IR-node representing an lvalue of the given expression.
3349  */
3350 static ir_node *expression_to_addr(const expression_t *expression)
3351 {
3352         switch(expression->kind) {
3353         case EXPR_ARRAY_ACCESS:
3354                 return array_access_addr(&expression->array_access);
3355         case EXPR_CALL:
3356                 return call_expression_to_firm(&expression->call);
3357         case EXPR_COMPOUND_LITERAL:
3358                 return compound_literal_addr(&expression->compound_literal);
3359         case EXPR_REFERENCE:
3360                 return reference_addr(&expression->reference);
3361         case EXPR_SELECT:
3362                 return select_addr(&expression->select);
3363         case EXPR_UNARY_DEREFERENCE:
3364                 return dereference_addr(&expression->unary);
3365         default:
3366                 break;
3367         }
3368         panic("trying to get address of non-lvalue");
3369 }
3370
3371 static ir_node *builtin_constant_to_firm(
3372                 const builtin_constant_expression_t *expression)
3373 {
3374         ir_mode *const mode = get_ir_mode_arithmetic(expression->base.type);
3375         bool     const v    = is_constant_expression(expression->value) == EXPR_CLASS_CONSTANT;
3376         return create_Const_from_bool(mode, v);
3377 }
3378
3379 static ir_node *builtin_types_compatible_to_firm(
3380                 const builtin_types_compatible_expression_t *expression)
3381 {
3382         type_t  *const left  = get_unqualified_type(skip_typeref(expression->left));
3383         type_t  *const right = get_unqualified_type(skip_typeref(expression->right));
3384         bool     const value = types_compatible(left, right);
3385         ir_mode *const mode  = get_ir_mode_arithmetic(expression->base.type);
3386         return create_Const_from_bool(mode, value);
3387 }
3388
3389 static ir_node *get_label_block(label_t *label)
3390 {
3391         if (label->block != NULL)
3392                 return label->block;
3393
3394         /* beware: might be called from create initializer with current_ir_graph
3395          * set to const_code_irg. */
3396         ir_graph *rem    = current_ir_graph;
3397         current_ir_graph = current_function;
3398
3399         ir_node *block = new_immBlock();
3400
3401         label->block = block;
3402
3403         ARR_APP1(label_t *, all_labels, label);
3404
3405         current_ir_graph = rem;
3406         return block;
3407 }
3408
3409 /**
3410  * Pointer to a label.  This is used for the
3411  * GNU address-of-label extension.
3412  */
3413 static ir_node *label_address_to_firm(const label_address_expression_t *label)
3414 {
3415         dbg_info  *dbgi   = get_dbg_info(&label->base.source_position);
3416         ir_node   *block  = get_label_block(label->label);
3417         ir_entity *entity = create_Block_entity(block);
3418
3419         symconst_symbol value;
3420         value.entity_p = entity;
3421         return new_d_SymConst(dbgi, mode_P_code, value, symconst_addr_ent);
3422 }
3423
3424 /**
3425  * creates firm nodes for an expression. The difference between this function
3426  * and expression_to_firm is, that this version might produce mode_b nodes
3427  * instead of mode_Is.
3428  */
3429 static ir_node *_expression_to_firm(expression_t const *const expr)
3430 {
3431 #ifndef NDEBUG
3432         if (!constant_folding) {
3433                 assert(!expr->base.transformed);
3434                 ((expression_t*)expr)->base.transformed = true;
3435         }
3436 #endif
3437
3438         switch (expr->kind) {
3439         case EXPR_ALIGNOF:                    return alignof_to_firm(                 &expr->typeprop);
3440         case EXPR_ARRAY_ACCESS:               return array_access_to_firm(            &expr->array_access);
3441         case EXPR_BINARY_CASES:               return binary_expression_to_firm(       &expr->binary);
3442         case EXPR_BUILTIN_CONSTANT_P:         return builtin_constant_to_firm(        &expr->builtin_constant);
3443         case EXPR_BUILTIN_TYPES_COMPATIBLE_P: return builtin_types_compatible_to_firm(&expr->builtin_types_compatible);
3444         case EXPR_CALL:                       return call_expression_to_firm(         &expr->call);
3445         case EXPR_CLASSIFY_TYPE:              return classify_type_to_firm(           &expr->classify_type);
3446         case EXPR_COMPOUND_LITERAL:           return compound_literal_to_firm(        &expr->compound_literal);
3447         case EXPR_CONDITIONAL:                return conditional_to_firm(             &expr->conditional);
3448         case EXPR_FUNCNAME:                   return function_name_to_firm(           &expr->funcname);
3449         case EXPR_LABEL_ADDRESS:              return label_address_to_firm(           &expr->label_address);
3450         case EXPR_LITERAL_CASES:              return literal_to_firm(                 &expr->literal);
3451         case EXPR_OFFSETOF:                   return offsetof_to_firm(                &expr->offsetofe);
3452         case EXPR_REFERENCE:                  return reference_expression_to_firm(    &expr->reference);
3453         case EXPR_ENUM_CONSTANT:              return enum_constant_to_firm(           &expr->reference);
3454         case EXPR_SELECT:                     return select_to_firm(                  &expr->select);
3455         case EXPR_SIZEOF:                     return sizeof_to_firm(                  &expr->typeprop);
3456         case EXPR_STATEMENT:                  return statement_expression_to_firm(    &expr->statement);
3457         case EXPR_UNARY_CASES:                return unary_expression_to_firm(        &expr->unary);
3458         case EXPR_VA_ARG:                     return va_arg_expression_to_firm(       &expr->va_arge);
3459         case EXPR_VA_COPY:                    return va_copy_expression_to_firm(      &expr->va_copye);
3460         case EXPR_VA_START:                   return va_start_expression_to_firm(     &expr->va_starte);
3461         case EXPR_WIDE_STRING_LITERAL:        return wide_string_literal_to_firm(     &expr->string_literal);
3462
3463         case EXPR_STRING_LITERAL: return string_to_firm(&expr->base.source_position, "str.%u", &expr->literal.value);
3464
3465         case EXPR_ERROR: break;
3466         }
3467         panic("invalid expression found");
3468 }
3469
3470 /**
3471  * Check if a given expression is a GNU __builtin_expect() call.
3472  */
3473 static bool is_builtin_expect(const expression_t *expression)
3474 {
3475         if (expression->kind != EXPR_CALL)
3476                 return false;
3477
3478         expression_t *function = expression->call.function;
3479         if (function->kind != EXPR_REFERENCE)
3480                 return false;
3481         reference_expression_t *ref = &function->reference;
3482         if (ref->entity->kind         != ENTITY_FUNCTION ||
3483             ref->entity->function.btk != BUILTIN_EXPECT)
3484                 return false;
3485
3486         return true;
3487 }
3488
3489 static bool produces_mode_b(const expression_t *expression)
3490 {
3491         switch (expression->kind) {
3492         case EXPR_BINARY_EQUAL:
3493         case EXPR_BINARY_NOTEQUAL:
3494         case EXPR_BINARY_LESS:
3495         case EXPR_BINARY_LESSEQUAL:
3496         case EXPR_BINARY_GREATER:
3497         case EXPR_BINARY_GREATEREQUAL:
3498         case EXPR_BINARY_ISGREATER:
3499         case EXPR_BINARY_ISGREATEREQUAL:
3500         case EXPR_BINARY_ISLESS:
3501         case EXPR_BINARY_ISLESSEQUAL:
3502         case EXPR_BINARY_ISLESSGREATER:
3503         case EXPR_BINARY_ISUNORDERED:
3504         case EXPR_UNARY_NOT:
3505                 return true;
3506
3507         case EXPR_CALL:
3508                 if (is_builtin_expect(expression)) {
3509                         expression_t *argument = expression->call.arguments->expression;
3510                         return produces_mode_b(argument);
3511                 }
3512                 return false;
3513         case EXPR_BINARY_COMMA:
3514                 return produces_mode_b(expression->binary.right);
3515
3516         default:
3517                 return false;
3518         }
3519 }
3520
3521 static ir_node *expression_to_firm(const expression_t *expression)
3522 {
3523         if (!produces_mode_b(expression)) {
3524                 ir_node *res = _expression_to_firm(expression);
3525                 assert(res == NULL || get_irn_mode(res) != mode_b);
3526                 return res;
3527         }
3528
3529         if (is_constant_expression(expression) == EXPR_CLASS_CONSTANT) {
3530                 bool const constant_folding_old = constant_folding;
3531                 constant_folding = true;
3532                 ir_node *res  = _expression_to_firm(expression);
3533                 constant_folding = constant_folding_old;
3534                 ir_mode *mode = get_ir_mode_arithmetic(expression->base.type);
3535                 assert(is_Const(res));
3536                 return create_Const_from_bool(mode, !is_Const_null(res));
3537         }
3538
3539         /* we have to produce a 0/1 from the mode_b expression */
3540         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3541         ir_mode  *mode = get_ir_mode_arithmetic(expression->base.type);
3542         return produce_condition_result(expression, mode, dbgi);
3543 }
3544
3545 /**
3546  * create a short-circuit expression evaluation that tries to construct
3547  * efficient control flow structures for &&, || and ! expressions
3548  */
3549 static ir_node *create_condition_evaluation(const expression_t *expression,
3550                                             ir_node *true_block,
3551                                             ir_node *false_block)
3552 {
3553         switch(expression->kind) {
3554         case EXPR_UNARY_NOT: {
3555                 const unary_expression_t *unary_expression = &expression->unary;
3556                 create_condition_evaluation(unary_expression->value, false_block,
3557                                             true_block);
3558                 return NULL;
3559         }
3560         case EXPR_BINARY_LOGICAL_AND: {
3561                 const binary_expression_t *binary_expression = &expression->binary;
3562
3563                 ir_node *extra_block = new_immBlock();
3564                 create_condition_evaluation(binary_expression->left, extra_block,
3565                                             false_block);
3566                 mature_immBlock(extra_block);
3567                 set_cur_block(extra_block);
3568                 create_condition_evaluation(binary_expression->right, true_block,
3569                                             false_block);
3570                 return NULL;
3571         }
3572         case EXPR_BINARY_LOGICAL_OR: {
3573                 const binary_expression_t *binary_expression = &expression->binary;
3574
3575                 ir_node *extra_block = new_immBlock();
3576                 create_condition_evaluation(binary_expression->left, true_block,
3577                                             extra_block);
3578                 mature_immBlock(extra_block);
3579                 set_cur_block(extra_block);
3580                 create_condition_evaluation(binary_expression->right, true_block,
3581                                             false_block);
3582                 return NULL;
3583         }
3584         default:
3585                 break;
3586         }
3587
3588         dbg_info *dbgi       = get_dbg_info(&expression->base.source_position);
3589         ir_node  *cond_expr  = _expression_to_firm(expression);
3590         ir_node  *condition  = create_conv(dbgi, cond_expr, mode_b);
3591         ir_node  *cond       = new_d_Cond(dbgi, condition);
3592         ir_node  *true_proj  = new_d_Proj(dbgi, cond, mode_X, pn_Cond_true);
3593         ir_node  *false_proj = new_d_Proj(dbgi, cond, mode_X, pn_Cond_false);
3594
3595         /* set branch prediction info based on __builtin_expect */
3596         if (is_builtin_expect(expression) && is_Cond(cond)) {
3597                 call_argument_t *argument = expression->call.arguments->next;
3598                 if (is_constant_expression(argument->expression) == EXPR_CLASS_CONSTANT) {
3599                         bool               const cnst = fold_constant_to_bool(argument->expression);
3600                         cond_jmp_predicate const pred = cnst ? COND_JMP_PRED_TRUE : COND_JMP_PRED_FALSE;
3601                         set_Cond_jmp_pred(cond, pred);
3602                 }
3603         }
3604
3605         add_immBlock_pred(true_block, true_proj);
3606         add_immBlock_pred(false_block, false_proj);
3607
3608         set_unreachable_now();
3609         return cond_expr;
3610 }
3611
3612 static void create_variable_entity(entity_t *variable,
3613                                    declaration_kind_t declaration_kind,
3614                                    ir_type *parent_type)
3615 {
3616         assert(variable->kind == ENTITY_VARIABLE);
3617         type_t    *type = skip_typeref(variable->declaration.type);
3618
3619         ident     *const id        = new_id_from_str(variable->base.symbol->string);
3620         ir_type   *const irtype    = get_ir_type(type);
3621         dbg_info  *const dbgi      = get_dbg_info(&variable->base.source_position);
3622         ir_entity *const irentity  = new_d_entity(parent_type, id, irtype, dbgi);
3623         unsigned         alignment = variable->declaration.alignment;
3624
3625         set_entity_alignment(irentity, alignment);
3626
3627         handle_decl_modifiers(irentity, variable);
3628
3629         variable->declaration.kind  = (unsigned char) declaration_kind;
3630         variable->variable.v.entity = irentity;
3631         set_entity_ld_ident(irentity, create_ld_ident(variable));
3632
3633         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
3634                 set_entity_volatility(irentity, volatility_is_volatile);
3635         }
3636 }
3637
3638
3639 typedef struct type_path_entry_t type_path_entry_t;
3640 struct type_path_entry_t {
3641         type_t           *type;
3642         ir_initializer_t *initializer;
3643         size_t            index;
3644         entity_t         *compound_entry;
3645 };
3646
3647 typedef struct type_path_t type_path_t;
3648 struct type_path_t {
3649         type_path_entry_t *path;
3650         type_t            *top_type;
3651         bool               invalid;
3652 };
3653
3654 static __attribute__((unused)) void debug_print_type_path(const type_path_t *path)
3655 {
3656         size_t len = ARR_LEN(path->path);
3657
3658         for (size_t i = 0; i < len; ++i) {
3659                 const type_path_entry_t *entry = & path->path[i];
3660
3661                 type_t *type = skip_typeref(entry->type);
3662                 if (is_type_compound(type)) {
3663                         fprintf(stderr, ".%s", entry->compound_entry->base.symbol->string);
3664                 } else if (is_type_array(type)) {
3665                         fprintf(stderr, "[%u]", (unsigned) entry->index);
3666                 } else {
3667                         fprintf(stderr, "-INVALID-");
3668                 }
3669         }
3670         fprintf(stderr, "  (");
3671         print_type(path->top_type);
3672         fprintf(stderr, ")");
3673 }
3674
3675 static type_path_entry_t *get_type_path_top(const type_path_t *path)
3676 {
3677         size_t len = ARR_LEN(path->path);
3678         assert(len > 0);
3679         return & path->path[len-1];
3680 }
3681
3682 static type_path_entry_t *append_to_type_path(type_path_t *path)
3683 {
3684         size_t len = ARR_LEN(path->path);
3685         ARR_RESIZE(type_path_entry_t, path->path, len+1);
3686
3687         type_path_entry_t *result = & path->path[len];
3688         memset(result, 0, sizeof(result[0]));
3689         return result;
3690 }
3691
3692 static size_t get_compound_member_count(const compound_type_t *type)
3693 {
3694         compound_t *compound  = type->compound;
3695         size_t      n_members = 0;
3696         entity_t   *member    = compound->members.entities;
3697         for ( ; member != NULL; member = member->base.next) {
3698                 ++n_members;
3699         }
3700
3701         return n_members;
3702 }
3703
3704 static ir_initializer_t *get_initializer_entry(type_path_t *path)
3705 {
3706         type_t *orig_top_type = path->top_type;
3707         type_t *top_type      = skip_typeref(orig_top_type);
3708
3709         assert(is_type_compound(top_type) || is_type_array(top_type));
3710
3711         if (ARR_LEN(path->path) == 0) {
3712                 return NULL;
3713         } else {
3714                 type_path_entry_t *top         = get_type_path_top(path);
3715                 ir_initializer_t  *initializer = top->initializer;
3716                 return get_initializer_compound_value(initializer, top->index);
3717         }
3718 }
3719
3720 static void descend_into_subtype(type_path_t *path)
3721 {
3722         type_t *orig_top_type = path->top_type;
3723         type_t *top_type      = skip_typeref(orig_top_type);
3724
3725         assert(is_type_compound(top_type) || is_type_array(top_type));
3726
3727         ir_initializer_t *initializer = get_initializer_entry(path);
3728
3729         type_path_entry_t *top = append_to_type_path(path);
3730         top->type              = top_type;
3731
3732         size_t len;
3733
3734         if (is_type_compound(top_type)) {
3735                 compound_t *const compound = top_type->compound.compound;
3736                 entity_t   *const entry    = skip_unnamed_bitfields(compound->members.entities);
3737
3738                 top->compound_entry = entry;
3739                 top->index          = 0;
3740                 len                 = get_compound_member_count(&top_type->compound);
3741                 if (entry != NULL) {
3742                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3743                         path->top_type = entry->declaration.type;
3744                 }
3745         } else {
3746                 assert(is_type_array(top_type));
3747                 assert(top_type->array.size > 0);
3748
3749                 top->index     = 0;
3750                 path->top_type = top_type->array.element_type;
3751                 len            = top_type->array.size;
3752         }
3753         if (initializer == NULL
3754                         || get_initializer_kind(initializer) == IR_INITIALIZER_NULL) {
3755                 initializer = create_initializer_compound(len);
3756                 /* we have to set the entry at the 2nd latest path entry... */
3757                 size_t path_len = ARR_LEN(path->path);
3758                 assert(path_len >= 1);
3759                 if (path_len > 1) {
3760                         type_path_entry_t *entry        = & path->path[path_len-2];
3761                         ir_initializer_t  *tinitializer = entry->initializer;
3762                         set_initializer_compound_value(tinitializer, entry->index,
3763                                                        initializer);
3764                 }
3765         }
3766         top->initializer = initializer;
3767 }
3768
3769 static void ascend_from_subtype(type_path_t *path)
3770 {
3771         type_path_entry_t *top = get_type_path_top(path);
3772
3773         path->top_type = top->type;
3774
3775         size_t len = ARR_LEN(path->path);
3776         ARR_RESIZE(type_path_entry_t, path->path, len-1);
3777 }
3778
3779 static void walk_designator(type_path_t *path, const designator_t *designator)
3780 {
3781         /* designators start at current object type */
3782         ARR_RESIZE(type_path_entry_t, path->path, 1);
3783
3784         for ( ; designator != NULL; designator = designator->next) {
3785                 type_path_entry_t *top         = get_type_path_top(path);
3786                 type_t            *orig_type   = top->type;
3787                 type_t            *type        = skip_typeref(orig_type);
3788
3789                 if (designator->symbol != NULL) {
3790                         assert(is_type_compound(type));
3791                         size_t    index  = 0;
3792                         symbol_t *symbol = designator->symbol;
3793
3794                         compound_t *compound = type->compound.compound;
3795                         entity_t   *iter     = compound->members.entities;
3796                         for ( ; iter != NULL; iter = iter->base.next, ++index) {
3797                                 if (iter->base.symbol == symbol) {
3798                                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
3799                                         break;
3800                                 }
3801                         }
3802                         assert(iter != NULL);
3803
3804                         /* revert previous initialisations of other union elements */
3805                         if (type->kind == TYPE_COMPOUND_UNION) {
3806                                 ir_initializer_t *initializer = top->initializer;
3807                                 if (initializer != NULL
3808                                         && get_initializer_kind(initializer) == IR_INITIALIZER_COMPOUND) {
3809                                         /* are we writing to a new element? */
3810                                         ir_initializer_t *oldi
3811                                                 = get_initializer_compound_value(initializer, index);
3812                                         if (get_initializer_kind(oldi) == IR_INITIALIZER_NULL) {
3813                                                 /* clear initializer */
3814                                                 size_t len
3815                                                         = get_initializer_compound_n_entries(initializer);
3816                                                 ir_initializer_t *nulli = get_initializer_null();
3817                                                 for (size_t i = 0; i < len; ++i) {
3818                                                         set_initializer_compound_value(initializer, i,
3819                                                                                        nulli);
3820                                                 }
3821                                         }
3822                                 }
3823                         }
3824
3825                         top->type           = orig_type;
3826                         top->compound_entry = iter;
3827                         top->index          = index;
3828                         orig_type           = iter->declaration.type;
3829                 } else {
3830                         expression_t *array_index = designator->array_index;
3831                         assert(designator->array_index != NULL);
3832                         assert(is_type_array(type));
3833
3834                         long index = fold_constant_to_int(array_index);
3835                         assert(index >= 0);
3836 #ifndef NDEBUG
3837                         if (type->array.size_constant) {
3838                                 long array_size = type->array.size;
3839                                 assert(index < array_size);
3840                         }
3841 #endif
3842
3843                         top->type  = orig_type;
3844                         top->index = (size_t) index;
3845                         orig_type  = type->array.element_type;
3846                 }
3847                 path->top_type = orig_type;
3848
3849                 if (designator->next != NULL) {
3850                         descend_into_subtype(path);
3851                 }
3852         }
3853
3854         path->invalid  = false;
3855 }
3856
3857 static void advance_current_object(type_path_t *path)
3858 {
3859         if (path->invalid) {
3860                 /* TODO: handle this... */
3861                 panic("invalid initializer in ast2firm (excessive elements)");
3862         }
3863
3864         type_path_entry_t *top = get_type_path_top(path);
3865
3866         type_t *type = skip_typeref(top->type);
3867         if (is_type_union(type)) {
3868                 /* only the first element is initialized in unions */
3869                 top->compound_entry = NULL;
3870         } else if (is_type_struct(type)) {
3871                 entity_t *entry = top->compound_entry;
3872
3873                 top->index++;
3874                 entry               = skip_unnamed_bitfields(entry->base.next);
3875                 top->compound_entry = entry;
3876                 if (entry != NULL) {
3877                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3878                         path->top_type = entry->declaration.type;
3879                         return;
3880                 }
3881         } else {
3882                 assert(is_type_array(type));
3883
3884                 top->index++;
3885                 if (!type->array.size_constant || top->index < type->array.size) {
3886                         return;
3887                 }
3888         }
3889
3890         /* we're past the last member of the current sub-aggregate, try if we
3891          * can ascend in the type hierarchy and continue with another subobject */
3892         size_t len = ARR_LEN(path->path);
3893
3894         if (len > 1) {
3895                 ascend_from_subtype(path);
3896                 advance_current_object(path);
3897         } else {
3898                 path->invalid = true;
3899         }
3900 }
3901
3902
3903 static ir_initializer_t *create_ir_initializer_value(
3904                 const initializer_value_t *initializer)
3905 {
3906         if (is_type_compound(initializer->value->base.type)) {
3907                 panic("initializer creation for compounds not implemented yet");
3908         }
3909         type_t       *type = initializer->value->base.type;
3910         expression_t *expr = initializer->value;
3911         ir_node *value = expression_to_firm(expr);
3912         ir_mode *mode  = get_ir_mode_storage(type);
3913         value          = create_conv(NULL, value, mode);
3914         return create_initializer_const(value);
3915 }
3916
3917 /** test wether type can be initialized by a string constant */
3918 static bool is_string_type(type_t *type)
3919 {
3920         type_t *inner;
3921         if (is_type_pointer(type)) {
3922                 inner = skip_typeref(type->pointer.points_to);
3923         } else if(is_type_array(type)) {
3924                 inner = skip_typeref(type->array.element_type);
3925         } else {
3926                 return false;
3927         }
3928
3929         return is_type_integer(inner);
3930 }
3931
3932 static ir_initializer_t *create_ir_initializer_list(
3933                 const initializer_list_t *initializer, type_t *type)
3934 {
3935         type_path_t path;
3936         memset(&path, 0, sizeof(path));
3937         path.top_type = type;
3938         path.path     = NEW_ARR_F(type_path_entry_t, 0);
3939
3940         descend_into_subtype(&path);
3941
3942         for (size_t i = 0; i < initializer->len; ++i) {
3943                 const initializer_t *sub_initializer = initializer->initializers[i];
3944
3945                 if (sub_initializer->kind == INITIALIZER_DESIGNATOR) {
3946                         walk_designator(&path, sub_initializer->designator.designator);
3947                         continue;
3948                 }
3949
3950                 if (sub_initializer->kind == INITIALIZER_VALUE) {
3951                         /* we might have to descend into types until we're at a scalar
3952                          * type */
3953                         while(true) {
3954                                 type_t *orig_top_type = path.top_type;
3955                                 type_t *top_type      = skip_typeref(orig_top_type);
3956
3957                                 if (is_type_scalar(top_type))
3958                                         break;
3959                                 descend_into_subtype(&path);
3960                         }
3961                 } else if (sub_initializer->kind == INITIALIZER_STRING
3962                                 || sub_initializer->kind == INITIALIZER_WIDE_STRING) {
3963                         /* we might have to descend into types until we're at a scalar
3964                          * type */
3965                         while (true) {
3966                                 type_t *orig_top_type = path.top_type;
3967                                 type_t *top_type      = skip_typeref(orig_top_type);
3968
3969                                 if (is_string_type(top_type))
3970                                         break;
3971                                 descend_into_subtype(&path);
3972                         }
3973                 }
3974
3975                 ir_initializer_t *sub_irinitializer
3976                         = create_ir_initializer(sub_initializer, path.top_type);
3977
3978                 size_t path_len = ARR_LEN(path.path);
3979                 assert(path_len >= 1);
3980                 type_path_entry_t *entry        = & path.path[path_len-1];
3981                 ir_initializer_t  *tinitializer = entry->initializer;
3982                 set_initializer_compound_value(tinitializer, entry->index,
3983                                                sub_irinitializer);
3984
3985                 advance_current_object(&path);
3986         }
3987
3988         assert(ARR_LEN(path.path) >= 1);
3989         ir_initializer_t *result = path.path[0].initializer;
3990         DEL_ARR_F(path.path);
3991
3992         return result;
3993 }
3994
3995 static ir_initializer_t *create_ir_initializer_string(
3996                 const initializer_string_t *initializer, type_t *type)
3997 {
3998         type = skip_typeref(type);
3999
4000         size_t            string_len    = initializer->string.size;
4001         assert(type->kind == TYPE_ARRAY);
4002         assert(type->array.size_constant);
4003         size_t            len           = type->array.size;
4004         ir_initializer_t *irinitializer = create_initializer_compound(len);
4005
4006         const char *string = initializer->string.begin;
4007         ir_mode    *mode   = get_ir_mode_storage(type->array.element_type);
4008
4009         for (size_t i = 0; i < len; ++i) {
4010                 char c = 0;
4011                 if (i < string_len)
4012                         c = string[i];
4013
4014                 ir_tarval        *tv = new_tarval_from_long(c, mode);
4015                 ir_initializer_t *char_initializer = create_initializer_tarval(tv);
4016
4017                 set_initializer_compound_value(irinitializer, i, char_initializer);
4018         }
4019
4020         return irinitializer;
4021 }
4022
4023 static ir_initializer_t *create_ir_initializer_wide_string(
4024                 const initializer_wide_string_t *initializer, type_t *type)
4025 {
4026         assert(type->kind == TYPE_ARRAY);
4027         assert(type->array.size_constant);
4028         size_t            len           = type->array.size;
4029         size_t            string_len    = wstrlen(&initializer->string);
4030         ir_initializer_t *irinitializer = create_initializer_compound(len);
4031
4032         const char *p    = initializer->string.begin;
4033         ir_mode    *mode = get_type_mode(ir_type_wchar_t);
4034
4035         for (size_t i = 0; i < len; ++i) {
4036                 utf32 c = 0;
4037                 if (i < string_len) {
4038                         c = read_utf8_char(&p);
4039                 }
4040                 ir_tarval *tv = new_tarval_from_long(c, mode);
4041                 ir_initializer_t *char_initializer = create_initializer_tarval(tv);
4042
4043                 set_initializer_compound_value(irinitializer, i, char_initializer);
4044         }
4045
4046         return irinitializer;
4047 }
4048
4049 static ir_initializer_t *create_ir_initializer(
4050                 const initializer_t *initializer, type_t *type)
4051 {
4052         switch(initializer->kind) {
4053                 case INITIALIZER_STRING:
4054                         return create_ir_initializer_string(&initializer->string, type);
4055
4056                 case INITIALIZER_WIDE_STRING:
4057                         return create_ir_initializer_wide_string(&initializer->wide_string,
4058                                                                  type);
4059
4060                 case INITIALIZER_LIST:
4061                         return create_ir_initializer_list(&initializer->list, type);
4062
4063                 case INITIALIZER_VALUE:
4064                         return create_ir_initializer_value(&initializer->value);
4065
4066                 case INITIALIZER_DESIGNATOR:
4067                         panic("unexpected designator initializer found");
4068         }
4069         panic("unknown initializer");
4070 }
4071
4072 /** ANSI C §6.7.8:21: If there are fewer initializers [..] than there
4073  *  are elements [...] the remainder of the aggregate shall be initialized
4074  *  implicitly the same as objects that have static storage duration. */
4075 static void create_dynamic_null_initializer(ir_entity *entity, dbg_info *dbgi,
4076                 ir_node *base_addr)
4077 {
4078         /* for unions we must NOT do anything for null initializers */
4079         ir_type *owner = get_entity_owner(entity);
4080         if (is_Union_type(owner)) {
4081                 return;
4082         }
4083
4084         ir_type *ent_type = get_entity_type(entity);
4085         /* create sub-initializers for a compound type */
4086         if (is_compound_type(ent_type)) {
4087                 unsigned n_members = get_compound_n_members(ent_type);
4088                 for (unsigned n = 0; n < n_members; ++n) {
4089                         ir_entity *member = get_compound_member(ent_type, n);
4090                         ir_node   *addr   = new_d_simpleSel(dbgi, new_NoMem(), base_addr,
4091                                                                 member);
4092                         create_dynamic_null_initializer(member, dbgi, addr);
4093                 }
4094                 return;
4095         }
4096         if (is_Array_type(ent_type)) {
4097                 assert(has_array_upper_bound(ent_type, 0));
4098                 long n = get_array_upper_bound_int(ent_type, 0);
4099                 for (long i = 0; i < n; ++i) {
4100                         ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
4101                         ir_tarval *index_tv = new_tarval_from_long(i, mode_uint);
4102                         ir_node   *cnst     = new_d_Const(dbgi, index_tv);
4103                         ir_node   *in[1]    = { cnst };
4104                         ir_entity *arrent   = get_array_element_entity(ent_type);
4105                         ir_node   *addr     = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in,
4106                                                         arrent);
4107                         create_dynamic_null_initializer(arrent, dbgi, addr);
4108                 }
4109                 return;
4110         }
4111
4112         ir_mode *value_mode = get_type_mode(ent_type);
4113         ir_node *node       = new_Const(get_mode_null(value_mode));
4114
4115         /* is it a bitfield type? */
4116         if (is_Primitive_type(ent_type) &&
4117                         get_primitive_base_type(ent_type) != NULL) {
4118                 bitfield_store_to_firm(dbgi, entity, base_addr, node, false, false);
4119                 return;
4120         }
4121
4122         ir_node *mem    = get_store();
4123         ir_node *store  = new_d_Store(dbgi, mem, base_addr, node, cons_none);
4124         ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4125         set_store(proj_m);
4126 }
4127
4128 static void create_dynamic_initializer_sub(ir_initializer_t *initializer,
4129                 ir_entity *entity, ir_type *type, dbg_info *dbgi, ir_node *base_addr)
4130 {
4131         switch(get_initializer_kind(initializer)) {
4132         case IR_INITIALIZER_NULL:
4133                 create_dynamic_null_initializer(entity, dbgi, base_addr);
4134                 return;
4135         case IR_INITIALIZER_CONST: {
4136                 ir_node *node     = get_initializer_const_value(initializer);
4137                 ir_type *ent_type = get_entity_type(entity);
4138
4139                 /* is it a bitfield type? */
4140                 if (is_Primitive_type(ent_type) &&
4141                                 get_primitive_base_type(ent_type) != NULL) {
4142                         bitfield_store_to_firm(dbgi, entity, base_addr, node, false, false);
4143                         return;
4144                 }
4145
4146                 assert(get_type_mode(type) == get_irn_mode(node));
4147                 ir_node *mem    = get_store();
4148                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, node, cons_none);
4149                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4150                 set_store(proj_m);
4151                 return;
4152         }
4153         case IR_INITIALIZER_TARVAL: {
4154                 ir_tarval *tv       = get_initializer_tarval_value(initializer);
4155                 ir_node   *cnst     = new_d_Const(dbgi, tv);
4156                 ir_type   *ent_type = get_entity_type(entity);
4157
4158                 /* is it a bitfield type? */
4159                 if (is_Primitive_type(ent_type) &&
4160                                 get_primitive_base_type(ent_type) != NULL) {
4161                         bitfield_store_to_firm(dbgi, entity, base_addr, cnst, false, false);
4162                         return;
4163                 }
4164
4165                 assert(get_type_mode(type) == get_tarval_mode(tv));
4166                 ir_node *mem    = get_store();
4167                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, cnst, cons_none);
4168                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4169                 set_store(proj_m);
4170                 return;
4171         }
4172         case IR_INITIALIZER_COMPOUND: {
4173                 assert(is_compound_type(type) || is_Array_type(type));
4174                 int n_members;
4175                 if (is_Array_type(type)) {
4176                         assert(has_array_upper_bound(type, 0));
4177                         n_members = get_array_upper_bound_int(type, 0);
4178                 } else {
4179                         n_members = get_compound_n_members(type);
4180                 }
4181
4182                 if (get_initializer_compound_n_entries(initializer)
4183                                 != (unsigned) n_members)
4184                         panic("initializer doesn't match compound type");
4185
4186                 for (int i = 0; i < n_members; ++i) {
4187                         ir_node   *addr;
4188                         ir_type   *irtype;
4189                         ir_entity *sub_entity;
4190                         if (is_Array_type(type)) {
4191                                 ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
4192                                 ir_tarval *index_tv = new_tarval_from_long(i, mode_uint);
4193                                 ir_node   *cnst     = new_d_Const(dbgi, index_tv);
4194                                 ir_node   *in[1]    = { cnst };
4195                                 irtype     = get_array_element_type(type);
4196                                 sub_entity = get_array_element_entity(type);
4197                                 addr       = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in,
4198                                                        sub_entity);
4199                         } else {
4200                                 sub_entity = get_compound_member(type, i);
4201                                 irtype     = get_entity_type(sub_entity);
4202                                 addr       = new_d_simpleSel(dbgi, new_NoMem(), base_addr,
4203                                                              sub_entity);
4204                         }
4205
4206                         ir_initializer_t *sub_init
4207                                 = get_initializer_compound_value(initializer, i);
4208
4209                         create_dynamic_initializer_sub(sub_init, sub_entity, irtype, dbgi,
4210                                                        addr);
4211                 }
4212                 return;
4213         }
4214         }
4215
4216         panic("invalid IR_INITIALIZER found");
4217 }
4218
4219 static void create_dynamic_initializer(ir_initializer_t *initializer,
4220                 dbg_info *dbgi, ir_entity *entity)
4221 {
4222         ir_node *frame     = get_irg_frame(current_ir_graph);
4223         ir_node *base_addr = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
4224         ir_type *type      = get_entity_type(entity);
4225
4226         create_dynamic_initializer_sub(initializer, entity, type, dbgi, base_addr);
4227 }
4228
4229 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
4230                                      ir_entity *entity, type_t *type)
4231 {
4232         ir_node *memory = get_store();
4233         ir_node *nomem  = new_NoMem();
4234         ir_node *frame  = get_irg_frame(current_ir_graph);
4235         ir_node *addr   = new_d_simpleSel(dbgi, nomem, frame, entity);
4236
4237         if (initializer->kind == INITIALIZER_VALUE) {
4238                 initializer_value_t *initializer_value = &initializer->value;
4239
4240                 ir_node *value = expression_to_firm(initializer_value->value);
4241                 type = skip_typeref(type);
4242                 assign_value(dbgi, addr, type, value);
4243                 return;
4244         }
4245
4246         if (is_constant_initializer(initializer) == EXPR_CLASS_VARIABLE) {
4247                 ir_initializer_t *irinitializer
4248                         = create_ir_initializer(initializer, type);
4249
4250                 create_dynamic_initializer(irinitializer, dbgi, entity);
4251                 return;
4252         }
4253
4254         /* create a "template" entity which is copied to the entity on the stack */
4255         ir_entity *const init_entity
4256                 = create_initializer_entity(dbgi, initializer, type);
4257         ir_node *const src_addr = create_symconst(dbgi, init_entity);
4258         ir_type *const irtype   = get_ir_type(type);
4259         ir_node *const copyb    = new_d_CopyB(dbgi, memory, addr, src_addr, irtype);
4260
4261         ir_node *const copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
4262         set_store(copyb_mem);
4263 }
4264
4265 static void create_initializer_local_variable_entity(entity_t *entity)
4266 {
4267         assert(entity->kind == ENTITY_VARIABLE);
4268         initializer_t *initializer = entity->variable.initializer;
4269         dbg_info      *dbgi        = get_dbg_info(&entity->base.source_position);
4270         ir_entity     *irentity    = entity->variable.v.entity;
4271         type_t        *type        = entity->declaration.type;
4272
4273         create_local_initializer(initializer, dbgi, irentity, type);
4274 }
4275
4276 static void create_variable_initializer(entity_t *entity)
4277 {
4278         assert(entity->kind == ENTITY_VARIABLE);
4279         initializer_t *initializer = entity->variable.initializer;
4280         if (initializer == NULL)
4281                 return;
4282
4283         declaration_kind_t declaration_kind
4284                 = (declaration_kind_t) entity->declaration.kind;
4285         if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY) {
4286                 create_initializer_local_variable_entity(entity);
4287                 return;
4288         }
4289
4290         type_t            *type = entity->declaration.type;
4291         type_qualifiers_t  tq   = get_type_qualifier(type, true);
4292
4293         if (initializer->kind == INITIALIZER_VALUE) {
4294                 initializer_value_t *initializer_value = &initializer->value;
4295                 dbg_info            *dbgi = get_dbg_info(&entity->base.source_position);
4296                 expression_t        *value     = initializer_value->value;
4297                 type_t              *init_type = value->base.type;
4298                 type_t              *skipped   = skip_typeref(init_type);
4299
4300                 if (!is_type_scalar(skipped)) {
4301                         /* skip convs */
4302                         while (value->kind == EXPR_UNARY_CAST)
4303                                 value = value->unary.value;
4304
4305                         if (value->kind != EXPR_COMPOUND_LITERAL)
4306                                 panic("expected non-scalar initializer to be a compound literal");
4307                         initializer = value->compound_literal.initializer;
4308                         goto have_initializer;
4309                 }
4310
4311                 ir_node *node = expression_to_firm(initializer_value->value);
4312
4313                 ir_mode *mode      = get_ir_mode_storage(init_type);
4314                 node = create_conv(dbgi, node, mode);
4315                 node = do_strict_conv(dbgi, node);
4316
4317                 if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE) {
4318                         set_value(entity->variable.v.value_number, node);
4319                 } else {
4320                         assert(declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4321
4322                         ir_entity *irentity = entity->variable.v.entity;
4323
4324                         if (tq & TYPE_QUALIFIER_CONST
4325                                         && get_entity_owner(irentity) != get_tls_type()) {
4326                                 add_entity_linkage(irentity, IR_LINKAGE_CONSTANT);
4327                         }
4328                         set_atomic_ent_value(irentity, node);
4329                 }
4330         } else {
4331 have_initializer:
4332                 assert(declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY ||
4333                        declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4334
4335                 ir_entity        *irentity        = entity->variable.v.entity;
4336                 ir_initializer_t *irinitializer
4337                         = create_ir_initializer(initializer, type);
4338
4339                 if (tq & TYPE_QUALIFIER_CONST) {
4340                         add_entity_linkage(irentity, IR_LINKAGE_CONSTANT);
4341                 }
4342                 set_entity_initializer(irentity, irinitializer);
4343         }
4344 }
4345
4346 static void create_variable_length_array(entity_t *entity)
4347 {
4348         assert(entity->kind == ENTITY_VARIABLE);
4349         assert(entity->variable.initializer == NULL);
4350
4351         entity->declaration.kind    = DECLARATION_KIND_VARIABLE_LENGTH_ARRAY;
4352         entity->variable.v.vla_base = NULL;
4353
4354         /* TODO: record VLA somewhere so we create the free node when we leave
4355          * it's scope */
4356 }
4357
4358 static void allocate_variable_length_array(entity_t *entity)
4359 {
4360         assert(entity->kind == ENTITY_VARIABLE);
4361         assert(entity->variable.initializer == NULL);
4362         assert(currently_reachable());
4363
4364         dbg_info *dbgi      = get_dbg_info(&entity->base.source_position);
4365         type_t   *type      = entity->declaration.type;
4366         ir_type  *el_type   = get_ir_type(type->array.element_type);
4367
4368         /* make sure size_node is calculated */
4369         get_type_size_node(type);
4370         ir_node  *elems = type->array.size_node;
4371         ir_node  *mem   = get_store();
4372         ir_node  *alloc = new_d_Alloc(dbgi, mem, elems, el_type, stack_alloc);
4373
4374         ir_node  *proj_m = new_d_Proj(dbgi, alloc, mode_M, pn_Alloc_M);
4375         ir_node  *addr   = new_d_Proj(dbgi, alloc, mode_P_data, pn_Alloc_res);
4376         set_store(proj_m);
4377
4378         assert(entity->declaration.kind == DECLARATION_KIND_VARIABLE_LENGTH_ARRAY);
4379         entity->variable.v.vla_base = addr;
4380 }
4381
4382 /**
4383  * Creates a Firm local variable from a declaration.
4384  */
4385 static void create_local_variable(entity_t *entity)
4386 {
4387         assert(entity->kind == ENTITY_VARIABLE);
4388         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4389
4390         bool needs_entity = entity->variable.address_taken;
4391         type_t *type = skip_typeref(entity->declaration.type);
4392
4393         /* is it a variable length array? */
4394         if (is_type_array(type) && !type->array.size_constant) {
4395                 create_variable_length_array(entity);
4396                 return;
4397         } else if (is_type_array(type) || is_type_compound(type)) {
4398                 needs_entity = true;
4399         } else if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
4400                 needs_entity = true;
4401         }
4402
4403         if (needs_entity) {
4404                 ir_type *frame_type = get_irg_frame_type(current_ir_graph);
4405                 create_variable_entity(entity,
4406                                        DECLARATION_KIND_LOCAL_VARIABLE_ENTITY,
4407                                        frame_type);
4408         } else {
4409                 entity->declaration.kind        = DECLARATION_KIND_LOCAL_VARIABLE;
4410                 entity->variable.v.value_number = next_value_number_function;
4411                 set_irg_loc_description(current_ir_graph, next_value_number_function,
4412                                         entity);
4413                 ++next_value_number_function;
4414         }
4415 }
4416
4417 static void create_local_static_variable(entity_t *entity)
4418 {
4419         assert(entity->kind == ENTITY_VARIABLE);
4420         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4421
4422         type_t   *type           = skip_typeref(entity->declaration.type);
4423         ir_type  *const var_type = entity->variable.thread_local ?
4424                 get_tls_type() : get_glob_type();
4425         ir_type  *const irtype   = get_ir_type(type);
4426         dbg_info *const dbgi     = get_dbg_info(&entity->base.source_position);
4427
4428         size_t l = strlen(entity->base.symbol->string);
4429         char   buf[l + sizeof(".%u")];
4430         snprintf(buf, sizeof(buf), "%s.%%u", entity->base.symbol->string);
4431         ident     *const id       = id_unique(buf);
4432         ir_entity *const irentity = new_d_entity(var_type, id, irtype, dbgi);
4433
4434         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
4435                 set_entity_volatility(irentity, volatility_is_volatile);
4436         }
4437
4438         entity->declaration.kind  = DECLARATION_KIND_GLOBAL_VARIABLE;
4439         entity->variable.v.entity = irentity;
4440
4441         set_entity_ld_ident(irentity, id);
4442         set_entity_visibility(irentity, ir_visibility_local);
4443
4444         ir_graph *const old_current_ir_graph = current_ir_graph;
4445         current_ir_graph = get_const_code_irg();
4446
4447         create_variable_initializer(entity);
4448
4449         assert(current_ir_graph == get_const_code_irg());
4450         current_ir_graph = old_current_ir_graph;
4451 }
4452
4453
4454
4455 static ir_node *return_statement_to_firm(return_statement_t *statement)
4456 {
4457         if (!currently_reachable())
4458                 return NULL;
4459
4460         dbg_info *const dbgi = get_dbg_info(&statement->base.source_position);
4461         type_t   *const type = skip_typeref(current_function_entity->declaration.type->function.return_type);
4462         ir_node  *      res  = statement->value ? expression_to_firm(statement->value) : NULL;
4463
4464         int in_len;
4465         if (!is_type_void(type)) {
4466                 ir_mode *const mode = is_type_compound(type) ? mode_P_data : get_ir_mode_storage(type);
4467                 if (res) {
4468                         res = create_conv(dbgi, res, mode);
4469                         res = do_strict_conv(dbgi, res);
4470                 } else {
4471                         res = new_Unknown(mode);
4472                 }
4473                 in_len = 1;
4474         } else {
4475                 in_len = 0;
4476         }
4477
4478         ir_node *const in[1] = { res };
4479         ir_node *const store = get_store();
4480         ir_node *const ret   = new_d_Return(dbgi, store, in_len, in);
4481
4482         ir_node *end_block = get_irg_end_block(current_ir_graph);
4483         add_immBlock_pred(end_block, ret);
4484
4485         set_unreachable_now();
4486         return NULL;
4487 }
4488
4489 static ir_node *expression_statement_to_firm(expression_statement_t *statement)
4490 {
4491         if (!currently_reachable())
4492                 return NULL;
4493
4494         return expression_to_firm(statement->expression);
4495 }
4496
4497 static ir_node *compound_statement_to_firm(compound_statement_t *compound)
4498 {
4499         entity_t *entity = compound->scope.entities;
4500         for ( ; entity != NULL; entity = entity->base.next) {
4501                 if (!is_declaration(entity))
4502                         continue;
4503
4504                 create_local_declaration(entity);
4505         }
4506
4507         ir_node     *result    = NULL;
4508         statement_t *statement = compound->statements;
4509         for ( ; statement != NULL; statement = statement->base.next) {
4510                 result = statement_to_firm(statement);
4511         }
4512
4513         return result;
4514 }
4515
4516 static void create_global_variable(entity_t *entity)
4517 {
4518         ir_linkage    linkage    = IR_LINKAGE_DEFAULT;
4519         ir_visibility visibility = ir_visibility_default;
4520         ir_entity    *irentity;
4521         assert(entity->kind == ENTITY_VARIABLE);
4522
4523         switch ((storage_class_tag_t)entity->declaration.storage_class) {
4524         case STORAGE_CLASS_EXTERN: visibility = ir_visibility_external; break;
4525         case STORAGE_CLASS_STATIC: visibility = ir_visibility_local;    break;
4526         case STORAGE_CLASS_NONE:
4527                 visibility = ir_visibility_default;
4528                 /* uninitialized globals get merged in C */
4529                 if (entity->variable.initializer == NULL)
4530                         linkage |= IR_LINKAGE_MERGE;
4531                 break;
4532         case STORAGE_CLASS_TYPEDEF:
4533         case STORAGE_CLASS_AUTO:
4534         case STORAGE_CLASS_REGISTER:
4535                 panic("invalid storage class for global var");
4536         }
4537
4538         ir_type *var_type = get_glob_type();
4539         if (entity->variable.thread_local) {
4540                 var_type = get_tls_type();
4541                 /* LINKAGE_MERGE not supported by current linkers */
4542                 linkage &= ~IR_LINKAGE_MERGE;
4543         }
4544         create_variable_entity(entity, DECLARATION_KIND_GLOBAL_VARIABLE, var_type);
4545         irentity = entity->variable.v.entity;
4546         add_entity_linkage(irentity, linkage);
4547         set_entity_visibility(irentity, visibility);
4548 }
4549
4550 static void create_local_declaration(entity_t *entity)
4551 {
4552         assert(is_declaration(entity));
4553
4554         /* construct type */
4555         (void) get_ir_type(entity->declaration.type);
4556         if (entity->base.symbol == NULL) {
4557                 return;
4558         }
4559
4560         switch ((storage_class_tag_t) entity->declaration.storage_class) {
4561         case STORAGE_CLASS_STATIC:
4562                 if (entity->kind == ENTITY_FUNCTION) {
4563                         (void)get_function_entity(entity, NULL);
4564                 } else {
4565                         create_local_static_variable(entity);
4566                 }
4567                 return;
4568         case STORAGE_CLASS_EXTERN:
4569                 if (entity->kind == ENTITY_FUNCTION) {
4570                         assert(entity->function.statement == NULL);
4571                         (void)get_function_entity(entity, NULL);
4572                 } else {
4573                         create_global_variable(entity);
4574                         create_variable_initializer(entity);
4575                 }
4576                 return;
4577         case STORAGE_CLASS_NONE:
4578         case STORAGE_CLASS_AUTO:
4579         case STORAGE_CLASS_REGISTER:
4580                 if (entity->kind == ENTITY_FUNCTION) {
4581                         if (entity->function.statement != NULL) {
4582                                 ir_type *owner = get_irg_frame_type(current_ir_graph);
4583                                 (void)get_function_entity(entity, owner);
4584                                 entity->declaration.kind = DECLARATION_KIND_INNER_FUNCTION;
4585                                 enqueue_inner_function(entity);
4586                         } else {
4587                                 (void)get_function_entity(entity, NULL);
4588                         }
4589                 } else {
4590                         create_local_variable(entity);
4591                 }
4592                 return;
4593         case STORAGE_CLASS_TYPEDEF:
4594                 break;
4595         }
4596         panic("invalid storage class found");
4597 }
4598
4599 static void initialize_local_declaration(entity_t *entity)
4600 {
4601         if (entity->base.symbol == NULL)
4602                 return;
4603
4604         // no need to emit code in dead blocks
4605         if (entity->declaration.storage_class != STORAGE_CLASS_STATIC
4606                         && !currently_reachable())
4607                 return;
4608
4609         switch ((declaration_kind_t) entity->declaration.kind) {
4610         case DECLARATION_KIND_LOCAL_VARIABLE:
4611         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY:
4612                 create_variable_initializer(entity);
4613                 return;
4614
4615         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
4616                 allocate_variable_length_array(entity);
4617                 return;
4618
4619         case DECLARATION_KIND_COMPOUND_MEMBER:
4620         case DECLARATION_KIND_GLOBAL_VARIABLE:
4621         case DECLARATION_KIND_FUNCTION:
4622         case DECLARATION_KIND_INNER_FUNCTION:
4623                 return;
4624
4625         case DECLARATION_KIND_PARAMETER:
4626         case DECLARATION_KIND_PARAMETER_ENTITY:
4627                 panic("can't initialize parameters");
4628
4629         case DECLARATION_KIND_UNKNOWN:
4630                 panic("can't initialize unknown declaration");
4631         }
4632         panic("invalid declaration kind");
4633 }
4634
4635 static ir_node *declaration_statement_to_firm(declaration_statement_t *statement)
4636 {
4637         entity_t *entity = statement->declarations_begin;
4638         if (entity == NULL)
4639                 return NULL;
4640
4641         entity_t *const last = statement->declarations_end;
4642         for ( ;; entity = entity->base.next) {
4643                 if (is_declaration(entity)) {
4644                         initialize_local_declaration(entity);
4645                 } else if (entity->kind == ENTITY_TYPEDEF) {
4646                         /* §6.7.7:3  Any array size expressions associated with variable length
4647                          * array declarators are evaluated each time the declaration of the
4648                          * typedef name is reached in the order of execution. */
4649                         type_t *const type = skip_typeref(entity->typedefe.type);
4650                         if (is_type_array(type) && type->array.is_vla)
4651                                 get_vla_size(&type->array);
4652                 }
4653                 if (entity == last)
4654                         break;
4655         }
4656
4657         return NULL;
4658 }
4659
4660 static ir_node *if_statement_to_firm(if_statement_t *statement)
4661 {
4662         /* Create the condition. */
4663         ir_node *true_block  = NULL;
4664         ir_node *false_block = NULL;
4665         if (currently_reachable()) {
4666                 true_block  = new_immBlock();
4667                 false_block = new_immBlock();
4668                 create_condition_evaluation(statement->condition, true_block, false_block);
4669                 mature_immBlock(true_block);
4670                 mature_immBlock(false_block);
4671         }
4672
4673         /* Create the true statement. */
4674         set_cur_block(true_block);
4675         statement_to_firm(statement->true_statement);
4676         ir_node *fallthrough_block = get_cur_block();
4677
4678         /* Create the false statement. */
4679         set_cur_block(false_block);
4680         if (statement->false_statement != NULL) {
4681                 statement_to_firm(statement->false_statement);
4682         }
4683
4684         /* Handle the block after the if-statement.  Minor simplification and
4685          * optimisation: Reuse the false/true block as fallthrough block, if the
4686          * true/false statement does not pass control to the fallthrough block, e.g.
4687          * in the typical if (x) return; pattern. */
4688         if (fallthrough_block) {
4689                 if (currently_reachable()) {
4690                         ir_node *const t_jump = new_r_Jmp(fallthrough_block);
4691                         ir_node *const f_jump = new_Jmp();
4692                         ir_node *const in[]   = { t_jump, f_jump };
4693                         fallthrough_block = new_Block(2, in);
4694                 }
4695                 set_cur_block(fallthrough_block);
4696         }
4697
4698         return NULL;
4699 }
4700
4701 /**
4702  * Add an unconditional jump to the target block.  If the source block is not
4703  * reachable, then a Bad predecessor is created to prevent Phi-less unreachable
4704  * loops.  This is necessary if the jump potentially enters a loop.
4705  */
4706 static void jump_to(ir_node *const target_block)
4707 {
4708         ir_node *const pred = currently_reachable() ? new_Jmp() : new_Bad(mode_X);
4709         add_immBlock_pred(target_block, pred);
4710 }
4711
4712 /**
4713  * Add an unconditional jump to the target block, if the current block is
4714  * reachable and do nothing otherwise.  This is only valid if the jump does not
4715  * enter a loop (a back edge is ok).
4716  */
4717 static void jump_if_reachable(ir_node *const target_block)
4718 {
4719         if (currently_reachable())
4720                 add_immBlock_pred(target_block, new_Jmp());
4721 }
4722
4723 static ir_node *while_statement_to_firm(while_statement_t *statement)
4724 {
4725         /* Create the header block */
4726         ir_node *const header_block = new_immBlock();
4727         jump_to(header_block);
4728
4729         /* Create the condition. */
4730         ir_node      *      body_block;
4731         ir_node      *      false_block;
4732         expression_t *const cond = statement->condition;
4733         if (is_constant_expression(cond) == EXPR_CLASS_CONSTANT &&
4734                         fold_constant_to_bool(cond)) {
4735                 /* Shortcut for while (true). */
4736                 body_block  = header_block;
4737                 false_block = NULL;
4738
4739                 keep_alive(header_block);
4740                 keep_all_memory(header_block);
4741         } else {
4742                 body_block  = new_immBlock();
4743                 false_block = new_immBlock();
4744
4745                 set_cur_block(header_block);
4746                 create_condition_evaluation(cond, body_block, false_block);
4747                 mature_immBlock(body_block);
4748         }
4749
4750         ir_node *const old_continue_label = continue_label;
4751         ir_node *const old_break_label    = break_label;
4752         continue_label = header_block;
4753         break_label    = false_block;
4754
4755         /* Create the loop body. */
4756         set_cur_block(body_block);
4757         statement_to_firm(statement->body);
4758         jump_if_reachable(header_block);
4759
4760         mature_immBlock(header_block);
4761         assert(false_block == NULL || false_block == break_label);
4762         false_block = break_label;
4763         if (false_block != NULL) {
4764                 mature_immBlock(false_block);
4765         }
4766         set_cur_block(false_block);
4767
4768         assert(continue_label == header_block);
4769         continue_label = old_continue_label;
4770         break_label    = old_break_label;
4771         return NULL;
4772 }
4773
4774 static ir_node *get_break_label(void)
4775 {
4776         if (break_label == NULL) {
4777                 break_label = new_immBlock();
4778         }
4779         return break_label;
4780 }
4781
4782 static ir_node *do_while_statement_to_firm(do_while_statement_t *statement)
4783 {
4784         /* create the header block */
4785         ir_node *header_block = new_immBlock();
4786
4787         /* the loop body */
4788         ir_node *body_block = new_immBlock();
4789         jump_to(body_block);
4790
4791         ir_node *old_continue_label = continue_label;
4792         ir_node *old_break_label    = break_label;
4793         continue_label              = header_block;
4794         break_label                 = NULL;
4795
4796         set_cur_block(body_block);
4797         statement_to_firm(statement->body);
4798         ir_node *const false_block = get_break_label();
4799
4800         assert(continue_label == header_block);
4801         continue_label = old_continue_label;
4802         break_label    = old_break_label;
4803
4804         jump_if_reachable(header_block);
4805
4806         /* create the condition */
4807         mature_immBlock(header_block);
4808         set_cur_block(header_block);
4809
4810         create_condition_evaluation(statement->condition, body_block, false_block);
4811         mature_immBlock(body_block);
4812         mature_immBlock(false_block);
4813
4814         set_cur_block(false_block);
4815         return NULL;
4816 }
4817
4818 static ir_node *for_statement_to_firm(for_statement_t *statement)
4819 {
4820         /* create declarations */
4821         entity_t *entity = statement->scope.entities;
4822         for ( ; entity != NULL; entity = entity->base.next) {
4823                 if (!is_declaration(entity))
4824                         continue;
4825
4826                 create_local_declaration(entity);
4827         }
4828
4829         if (currently_reachable()) {
4830                 entity = statement->scope.entities;
4831                 for ( ; entity != NULL; entity = entity->base.next) {
4832                         if (!is_declaration(entity))
4833                                 continue;
4834
4835                         initialize_local_declaration(entity);
4836                 }
4837
4838                 if (statement->initialisation != NULL) {
4839                         expression_to_firm(statement->initialisation);
4840                 }
4841         }
4842
4843         /* Create the header block */
4844         ir_node *const header_block = new_immBlock();
4845         jump_to(header_block);
4846
4847         /* Create the condition. */
4848         ir_node *body_block;
4849         ir_node *false_block;
4850         if (statement->condition != NULL) {
4851                 body_block  = new_immBlock();
4852                 false_block = new_immBlock();
4853
4854                 set_cur_block(header_block);
4855                 create_condition_evaluation(statement->condition, body_block, false_block);
4856                 mature_immBlock(body_block);
4857         } else {
4858                 /* for-ever. */
4859                 body_block  = header_block;
4860                 false_block = NULL;
4861
4862                 keep_alive(header_block);
4863                 keep_all_memory(header_block);
4864         }
4865
4866         /* Create the step block, if necessary. */
4867         ir_node      *      step_block = header_block;
4868         expression_t *const step       = statement->step;
4869         if (step != NULL) {
4870                 step_block = new_immBlock();
4871         }
4872
4873         ir_node *const old_continue_label = continue_label;
4874         ir_node *const old_break_label    = break_label;
4875         continue_label = step_block;
4876         break_label    = false_block;
4877
4878         /* Create the loop body. */
4879         set_cur_block(body_block);
4880         statement_to_firm(statement->body);
4881         jump_if_reachable(step_block);
4882
4883         /* Create the step code. */
4884         if (step != NULL) {
4885                 mature_immBlock(step_block);
4886                 set_cur_block(step_block);
4887                 expression_to_firm(step);
4888                 jump_if_reachable(header_block);
4889         }
4890
4891         mature_immBlock(header_block);
4892         assert(false_block == NULL || false_block == break_label);
4893         false_block = break_label;
4894         if (false_block != NULL) {
4895                 mature_immBlock(false_block);
4896         }
4897         set_cur_block(false_block);
4898
4899         assert(continue_label == step_block);
4900         continue_label = old_continue_label;
4901         break_label    = old_break_label;
4902         return NULL;
4903 }
4904
4905 static ir_node *create_jump_statement(const statement_t *statement, ir_node *target_block)
4906 {
4907         if (!currently_reachable())
4908                 return NULL;
4909
4910         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
4911         ir_node  *jump = new_d_Jmp(dbgi);
4912         add_immBlock_pred(target_block, jump);
4913
4914         set_unreachable_now();
4915         return NULL;
4916 }
4917
4918 static ir_switch_table *create_switch_table(const switch_statement_t *statement)
4919 {
4920         /* determine number of cases */
4921         size_t n_cases = 0;
4922         for (case_label_statement_t *l = statement->first_case; l != NULL;
4923              l = l->next) {
4924                 /* default case */
4925                 if (l->expression == NULL)
4926                         continue;
4927                 if (l->is_empty_range)
4928                         continue;
4929                 ++n_cases;
4930         }
4931
4932         ir_switch_table *res = ir_new_switch_table(current_ir_graph, n_cases);
4933         size_t           i   = 0;
4934         for (case_label_statement_t *l = statement->first_case; l != NULL;
4935              l = l->next) {
4936             if (l->expression == NULL) {
4937                         l->pn = pn_Switch_default;
4938                         continue;
4939                 }
4940                 if (l->is_empty_range)
4941                         continue;
4942                 ir_tarval *min = fold_constant_to_tarval(l->expression);
4943                 ir_tarval *max = min;
4944                 long       pn  = (long) i+1;
4945                 if (l->end_range != NULL)
4946                         max = fold_constant_to_tarval(l->end_range);
4947                 ir_switch_table_set(res, i++, min, max, pn);
4948                 l->pn = pn;
4949         }
4950         return res;
4951 }
4952
4953 static ir_node *switch_statement_to_firm(switch_statement_t *statement)
4954 {
4955         dbg_info *dbgi        = get_dbg_info(&statement->base.source_position);
4956         ir_node  *switch_node = NULL;
4957
4958         if (currently_reachable()) {
4959                 ir_node *expression = expression_to_firm(statement->expression);
4960                 ir_switch_table *table = create_switch_table(statement);
4961                 unsigned n_outs = (unsigned)ir_switch_table_get_n_entries(table) + 1;
4962
4963                 switch_node = new_d_Switch(dbgi, expression, n_outs, table);
4964         }
4965
4966         set_unreachable_now();
4967
4968         ir_node *const old_switch            = current_switch;
4969         ir_node *const old_break_label       = break_label;
4970         const bool     old_saw_default_label = saw_default_label;
4971         saw_default_label                    = false;
4972         current_switch                       = switch_node;
4973         break_label                          = NULL;
4974
4975         statement_to_firm(statement->body);
4976
4977         if (currently_reachable()) {
4978                 add_immBlock_pred(get_break_label(), new_Jmp());
4979         }
4980
4981         if (!saw_default_label && switch_node) {
4982                 ir_node *proj = new_d_Proj(dbgi, switch_node, mode_X, pn_Switch_default);
4983                 add_immBlock_pred(get_break_label(), proj);
4984         }
4985
4986         if (break_label != NULL) {
4987                 mature_immBlock(break_label);
4988         }
4989         set_cur_block(break_label);
4990
4991         assert(current_switch == switch_node);
4992         current_switch    = old_switch;
4993         break_label       = old_break_label;
4994         saw_default_label = old_saw_default_label;
4995         return NULL;
4996 }
4997
4998 static ir_node *case_label_to_firm(const case_label_statement_t *statement)
4999 {
5000         if (statement->is_empty_range)
5001                 return NULL;
5002
5003         if (current_switch != NULL) {
5004                 ir_node *block = new_immBlock();
5005                 /* Fallthrough from previous case */
5006                 jump_if_reachable(block);
5007
5008                 ir_node  *const proj = new_Proj(current_switch, mode_X, statement->pn);
5009                 add_immBlock_pred(block, proj);
5010                 if (statement->expression == NULL)
5011                         saw_default_label = true;
5012
5013                 mature_immBlock(block);
5014                 set_cur_block(block);
5015         }
5016
5017         return statement_to_firm(statement->statement);
5018 }
5019
5020 static ir_node *label_to_firm(const label_statement_t *statement)
5021 {
5022         ir_node *block = get_label_block(statement->label);
5023         jump_to(block);
5024
5025         set_cur_block(block);
5026         keep_alive(block);
5027         keep_all_memory(block);
5028
5029         return statement_to_firm(statement->statement);
5030 }
5031
5032 static ir_node *computed_goto_to_firm(computed_goto_statement_t const *const statement)
5033 {
5034         if (!currently_reachable())
5035                 return NULL;
5036
5037         ir_node  *const irn  = expression_to_firm(statement->expression);
5038         dbg_info *const dbgi = get_dbg_info(&statement->base.source_position);
5039         ir_node  *const ijmp = new_d_IJmp(dbgi, irn);
5040
5041         set_irn_link(ijmp, ijmp_list);
5042         ijmp_list = ijmp;
5043
5044         set_unreachable_now();
5045         return NULL;
5046 }
5047
5048 static ir_node *asm_statement_to_firm(const asm_statement_t *statement)
5049 {
5050         bool needs_memory = false;
5051
5052         if (statement->is_volatile) {
5053                 needs_memory = true;
5054         }
5055
5056         size_t         n_clobbers = 0;
5057         asm_clobber_t *clobber    = statement->clobbers;
5058         for ( ; clobber != NULL; clobber = clobber->next) {
5059                 const char *clobber_str = clobber->clobber.begin;
5060
5061                 if (!be_is_valid_clobber(clobber_str)) {
5062                         errorf(&statement->base.source_position,
5063                                    "invalid clobber '%s' specified", clobber->clobber);
5064                         continue;
5065                 }
5066
5067                 if (streq(clobber_str, "memory")) {
5068                         needs_memory = true;
5069                         continue;
5070                 }
5071
5072                 ident *id = new_id_from_str(clobber_str);
5073                 obstack_ptr_grow(&asm_obst, id);
5074                 ++n_clobbers;
5075         }
5076         assert(obstack_object_size(&asm_obst) == n_clobbers * sizeof(ident*));
5077         ident **clobbers = NULL;
5078         if (n_clobbers > 0) {
5079                 clobbers = obstack_finish(&asm_obst);
5080         }
5081
5082         size_t n_inputs  = 0;
5083         asm_argument_t *argument = statement->inputs;
5084         for ( ; argument != NULL; argument = argument->next)
5085                 n_inputs++;
5086         size_t n_outputs = 0;
5087         argument = statement->outputs;
5088         for ( ; argument != NULL; argument = argument->next)
5089                 n_outputs++;
5090
5091         unsigned next_pos = 0;
5092
5093         ir_node *ins[n_inputs + n_outputs + 1];
5094         size_t   in_size = 0;
5095
5096         ir_asm_constraint tmp_in_constraints[n_outputs];
5097
5098         const expression_t *out_exprs[n_outputs];
5099         ir_node            *out_addrs[n_outputs];
5100         size_t              out_size = 0;
5101
5102         argument = statement->outputs;
5103         for ( ; argument != NULL; argument = argument->next) {
5104                 const char *constraints = argument->constraints.begin;
5105                 asm_constraint_flags_t asm_flags
5106                         = be_parse_asm_constraints(constraints);
5107
5108                 {
5109                         source_position_t const *const pos = &statement->base.source_position;
5110                         if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
5111                                 warningf(WARN_OTHER, pos, "some constraints in '%s' are not supported", constraints);
5112                         }
5113                         if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
5114                                 errorf(pos, "some constraints in '%s' are invalid", constraints);
5115                                 continue;
5116                         }
5117                         if (! (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE)) {
5118                                 errorf(pos, "no write flag specified for output constraints '%s'", constraints);
5119                                 continue;
5120                         }
5121                 }
5122
5123                 unsigned pos = next_pos++;
5124                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
5125                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
5126                         expression_t *expr = argument->expression;
5127                         ir_node      *addr = expression_to_addr(expr);
5128                         /* in+output, construct an artifical same_as constraint on the
5129                          * input */
5130                         if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_READ) {
5131                                 char     buf[64];
5132                                 ir_node *value = get_value_from_lvalue(expr, addr);
5133
5134                                 snprintf(buf, sizeof(buf), "%u", (unsigned) out_size);
5135
5136                                 ir_asm_constraint constraint;
5137                                 constraint.pos              = pos;
5138                                 constraint.constraint       = new_id_from_str(buf);
5139                                 constraint.mode             = get_ir_mode_storage(expr->base.type);
5140                                 tmp_in_constraints[in_size] = constraint;
5141                                 ins[in_size] = value;
5142
5143                                 ++in_size;
5144                         }
5145
5146                         out_exprs[out_size] = expr;
5147                         out_addrs[out_size] = addr;
5148                         ++out_size;
5149                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
5150                         /* pure memory ops need no input (but we have to make sure we
5151                          * attach to the memory) */
5152                         assert(! (asm_flags &
5153                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
5154                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
5155                         needs_memory = true;
5156
5157                         /* we need to attach the address to the inputs */
5158                         expression_t *expr = argument->expression;
5159
5160                         ir_asm_constraint constraint;
5161                         constraint.pos              = pos;
5162                         constraint.constraint       = new_id_from_str(constraints);
5163                         constraint.mode             = mode_M;
5164                         tmp_in_constraints[in_size] = constraint;
5165
5166                         ins[in_size]          = expression_to_addr(expr);
5167                         ++in_size;
5168                         continue;
5169                 } else {
5170                         errorf(&statement->base.source_position,
5171                                "only modifiers but no place set in constraints '%s'",
5172                                constraints);
5173                         continue;
5174                 }
5175
5176                 ir_asm_constraint constraint;
5177                 constraint.pos        = pos;
5178                 constraint.constraint = new_id_from_str(constraints);
5179                 constraint.mode       = get_ir_mode_storage(argument->expression->base.type);
5180
5181                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5182         }
5183         assert(obstack_object_size(&asm_obst)
5184                         == out_size * sizeof(ir_asm_constraint));
5185         ir_asm_constraint *output_constraints = obstack_finish(&asm_obst);
5186
5187
5188         obstack_grow(&asm_obst, tmp_in_constraints,
5189                      in_size * sizeof(tmp_in_constraints[0]));
5190         /* find and count input and output arguments */
5191         argument = statement->inputs;
5192         for ( ; argument != NULL; argument = argument->next) {
5193                 const char *constraints = argument->constraints.begin;
5194                 asm_constraint_flags_t asm_flags
5195                         = be_parse_asm_constraints(constraints);
5196
5197                 if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
5198                         errorf(&statement->base.source_position,
5199                                "some constraints in '%s' are not supported", constraints);
5200                         continue;
5201                 }
5202                 if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
5203                         errorf(&statement->base.source_position,
5204                                "some constraints in '%s' are invalid", constraints);
5205                         continue;
5206                 }
5207                 if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE) {
5208                         errorf(&statement->base.source_position,
5209                                "write flag specified for input constraints '%s'",
5210                                constraints);
5211                         continue;
5212                 }
5213
5214                 ir_node *input;
5215                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
5216                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
5217                         /* we can treat this as "normal" input */
5218                         input = expression_to_firm(argument->expression);
5219                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
5220                         /* pure memory ops need no input (but we have to make sure we
5221                          * attach to the memory) */
5222                         assert(! (asm_flags &
5223                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
5224                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
5225                         needs_memory = true;
5226                         input = expression_to_addr(argument->expression);
5227                 } else {
5228                         errorf(&statement->base.source_position,
5229                                "only modifiers but no place set in constraints '%s'",
5230                                constraints);
5231                         continue;
5232                 }
5233
5234                 ir_asm_constraint constraint;
5235                 constraint.pos        = next_pos++;
5236                 constraint.constraint = new_id_from_str(constraints);
5237                 constraint.mode       = get_irn_mode(input);
5238
5239                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5240                 ins[in_size++] = input;
5241         }
5242
5243         if (needs_memory) {
5244                 ir_asm_constraint constraint;
5245                 constraint.pos        = next_pos++;
5246                 constraint.constraint = new_id_from_str("");
5247                 constraint.mode       = mode_M;
5248
5249                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5250                 ins[in_size++] = get_store();
5251         }
5252
5253         assert(obstack_object_size(&asm_obst)
5254                         == in_size * sizeof(ir_asm_constraint));
5255         ir_asm_constraint *input_constraints = obstack_finish(&asm_obst);
5256
5257         /* create asm node */
5258         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
5259
5260         ident *asm_text = new_id_from_str(statement->asm_text.begin);
5261
5262         ir_node *node = new_d_ASM(dbgi, in_size, ins, input_constraints,
5263                                   out_size, output_constraints,
5264                                   n_clobbers, clobbers, asm_text);
5265
5266         if (statement->is_volatile) {
5267                 set_irn_pinned(node, op_pin_state_pinned);
5268         } else {
5269                 set_irn_pinned(node, op_pin_state_floats);
5270         }
5271
5272         /* create output projs & connect them */
5273         if (needs_memory) {
5274                 ir_node *projm = new_Proj(node, mode_M, out_size);
5275                 set_store(projm);
5276         }
5277
5278         size_t i;
5279         for (i = 0; i < out_size; ++i) {
5280                 const expression_t *out_expr = out_exprs[i];
5281                 long                pn       = i;
5282                 ir_mode            *mode     = get_ir_mode_storage(out_expr->base.type);
5283                 ir_node            *proj     = new_Proj(node, mode, pn);
5284                 ir_node            *addr     = out_addrs[i];
5285
5286                 set_value_for_expression_addr(out_expr, proj, addr);
5287         }
5288
5289         return NULL;
5290 }
5291
5292 static ir_node *ms_try_statement_to_firm(ms_try_statement_t *statement)
5293 {
5294         statement_to_firm(statement->try_statement);
5295         source_position_t const *const pos = &statement->base.source_position;
5296         warningf(WARN_OTHER, pos, "structured exception handling ignored");
5297         return NULL;
5298 }
5299
5300 static ir_node *leave_statement_to_firm(leave_statement_t *statement)
5301 {
5302         errorf(&statement->base.source_position, "__leave not supported yet");
5303         return NULL;
5304 }
5305
5306 /**
5307  * Transform a statement.
5308  */
5309 static ir_node *statement_to_firm(statement_t *const stmt)
5310 {
5311 #ifndef NDEBUG
5312         assert(!stmt->base.transformed);
5313         stmt->base.transformed = true;
5314 #endif
5315
5316         switch (stmt->kind) {
5317         case STATEMENT_ASM:           return asm_statement_to_firm(        &stmt->asms);
5318         case STATEMENT_CASE_LABEL:    return case_label_to_firm(           &stmt->case_label);
5319         case STATEMENT_COMPOUND:      return compound_statement_to_firm(   &stmt->compound);
5320         case STATEMENT_COMPUTED_GOTO: return computed_goto_to_firm(        &stmt->computed_goto);
5321         case STATEMENT_DECLARATION:   return declaration_statement_to_firm(&stmt->declaration);
5322         case STATEMENT_DO_WHILE:      return do_while_statement_to_firm(   &stmt->do_while);
5323         case STATEMENT_EMPTY:         return NULL; /* nothing */
5324         case STATEMENT_EXPRESSION:    return expression_statement_to_firm( &stmt->expression);
5325         case STATEMENT_FOR:           return for_statement_to_firm(        &stmt->fors);
5326         case STATEMENT_IF:            return if_statement_to_firm(         &stmt->ifs);
5327         case STATEMENT_LABEL:         return label_to_firm(                &stmt->label);
5328         case STATEMENT_LEAVE:         return leave_statement_to_firm(      &stmt->leave);
5329         case STATEMENT_MS_TRY:        return ms_try_statement_to_firm(     &stmt->ms_try);
5330         case STATEMENT_RETURN:        return return_statement_to_firm(     &stmt->returns);
5331         case STATEMENT_SWITCH:        return switch_statement_to_firm(     &stmt->switchs);
5332         case STATEMENT_WHILE:         return while_statement_to_firm(      &stmt->whiles);
5333
5334         case STATEMENT_BREAK:         return create_jump_statement(stmt, get_break_label());
5335         case STATEMENT_CONTINUE:      return create_jump_statement(stmt, continue_label);
5336         case STATEMENT_GOTO:          return create_jump_statement(stmt, get_label_block(stmt->gotos.label));
5337
5338         case STATEMENT_ERROR: panic("error statement found");
5339         }
5340         panic("statement not implemented");
5341 }
5342
5343 static int count_local_variables(const entity_t *entity,
5344                                  const entity_t *const last)
5345 {
5346         int count = 0;
5347         entity_t const *const end = last != NULL ? last->base.next : NULL;
5348         for (; entity != end; entity = entity->base.next) {
5349                 type_t *type;
5350                 bool    address_taken;
5351
5352                 if (entity->kind == ENTITY_VARIABLE) {
5353                         type          = skip_typeref(entity->declaration.type);
5354                         address_taken = entity->variable.address_taken;
5355                 } else if (entity->kind == ENTITY_PARAMETER) {
5356                         type          = skip_typeref(entity->declaration.type);
5357                         address_taken = entity->parameter.address_taken;
5358                 } else {
5359                         continue;
5360                 }
5361
5362                 if (!address_taken && is_type_scalar(type))
5363                         ++count;
5364         }
5365         return count;
5366 }
5367
5368 static void count_local_variables_in_stmt(statement_t *stmt, void *const env)
5369 {
5370         int *const count = env;
5371
5372         switch (stmt->kind) {
5373         case STATEMENT_DECLARATION: {
5374                 const declaration_statement_t *const decl_stmt = &stmt->declaration;
5375                 *count += count_local_variables(decl_stmt->declarations_begin,
5376                                 decl_stmt->declarations_end);
5377                 break;
5378         }
5379
5380         case STATEMENT_FOR:
5381                 *count += count_local_variables(stmt->fors.scope.entities, NULL);
5382                 break;
5383
5384         default:
5385                 break;
5386         }
5387 }
5388
5389 /**
5390  * Return the number of local (alias free) variables used by a function.
5391  */
5392 static int get_function_n_local_vars(entity_t *entity)
5393 {
5394         const function_t *function = &entity->function;
5395         int count = 0;
5396
5397         /* count parameters */
5398         count += count_local_variables(function->parameters.entities, NULL);
5399
5400         /* count local variables declared in body */
5401         walk_statements(function->statement, count_local_variables_in_stmt, &count);
5402         return count;
5403 }
5404
5405 /**
5406  * Build Firm code for the parameters of a function.
5407  */
5408 static void initialize_function_parameters(entity_t *entity)
5409 {
5410         assert(entity->kind == ENTITY_FUNCTION);
5411         ir_graph *irg             = current_ir_graph;
5412         ir_node  *args            = get_irg_args(irg);
5413         int       n               = 0;
5414         ir_type  *function_irtype;
5415
5416         if (entity->function.need_closure) {
5417                 /* add an extra parameter for the static link */
5418                 entity->function.static_link = new_r_Proj(args, mode_P_data, 0);
5419                 ++n;
5420
5421                 /* Matze: IMO this is wrong, nested functions should have an own
5422                  * type and not rely on strange parameters... */
5423                 function_irtype = create_method_type(&entity->declaration.type->function, true);
5424         } else {
5425                 function_irtype = get_ir_type(entity->declaration.type);
5426         }
5427
5428
5429
5430         entity_t *parameter = entity->function.parameters.entities;
5431         for ( ; parameter != NULL; parameter = parameter->base.next, ++n) {
5432                 if (parameter->kind != ENTITY_PARAMETER)
5433                         continue;
5434
5435                 assert(parameter->declaration.kind == DECLARATION_KIND_UNKNOWN);
5436                 type_t *type = skip_typeref(parameter->declaration.type);
5437
5438                 bool needs_entity = parameter->parameter.address_taken;
5439                 assert(!is_type_array(type));
5440                 if (is_type_compound(type)) {
5441                         needs_entity = true;
5442                 }
5443
5444                 ir_type *param_irtype = get_method_param_type(function_irtype, n);
5445                 if (needs_entity) {
5446                         ir_type   *frame_type = get_irg_frame_type(irg);
5447                         ir_entity *param
5448                                 = new_parameter_entity(frame_type, n, param_irtype);
5449                         parameter->declaration.kind
5450                                 = DECLARATION_KIND_PARAMETER_ENTITY;
5451                         parameter->parameter.v.entity = param;
5452                         continue;
5453                 }
5454
5455                 ir_mode *param_mode = get_type_mode(param_irtype);
5456                 long     pn         = n;
5457                 ir_node *value      = new_r_Proj(args, param_mode, pn);
5458
5459                 ir_mode *mode = get_ir_mode_storage(type);
5460                 value = create_conv(NULL, value, mode);
5461                 value = do_strict_conv(NULL, value);
5462
5463                 parameter->declaration.kind         = DECLARATION_KIND_PARAMETER;
5464                 parameter->parameter.v.value_number = next_value_number_function;
5465                 set_irg_loc_description(current_ir_graph, next_value_number_function,
5466                                         parameter);
5467                 ++next_value_number_function;
5468
5469                 set_value(parameter->parameter.v.value_number, value);
5470         }
5471 }
5472
5473 /**
5474  * Handle additional decl modifiers for IR-graphs
5475  *
5476  * @param irg            the IR-graph
5477  * @param dec_modifiers  additional modifiers
5478  */
5479 static void handle_decl_modifier_irg(ir_graph *irg,
5480                                      decl_modifiers_t decl_modifiers)
5481 {
5482         if (decl_modifiers & DM_NAKED) {
5483                 /* TRUE if the declaration includes the Microsoft
5484                    __declspec(naked) specifier. */
5485                 add_irg_additional_properties(irg, mtp_property_naked);
5486         }
5487         if (decl_modifiers & DM_FORCEINLINE) {
5488                 /* TRUE if the declaration includes the
5489                    Microsoft __forceinline specifier. */
5490                 set_irg_inline_property(irg, irg_inline_forced);
5491         }
5492         if (decl_modifiers & DM_NOINLINE) {
5493                 /* TRUE if the declaration includes the Microsoft
5494                    __declspec(noinline) specifier. */
5495                 set_irg_inline_property(irg, irg_inline_forbidden);
5496         }
5497 }
5498
5499 static void add_function_pointer(ir_type *segment, ir_entity *method,
5500                                  const char *unique_template)
5501 {
5502         ir_type   *method_type  = get_entity_type(method);
5503         ir_type   *ptr_type     = new_type_pointer(method_type);
5504
5505         /* these entities don't really have a name but firm only allows
5506          * "" in ld_ident.
5507          * Note that we mustn't give these entities a name since for example
5508          * Mach-O doesn't allow them. */
5509         ident     *ide          = id_unique(unique_template);
5510         ir_entity *ptr          = new_entity(segment, ide, ptr_type);
5511         ir_graph  *irg          = get_const_code_irg();
5512         ir_node   *val          = new_rd_SymConst_addr_ent(NULL, irg, mode_P_code,
5513                                                            method);
5514
5515         set_entity_ld_ident(ptr, new_id_from_chars("", 0));
5516         set_entity_compiler_generated(ptr, 1);
5517         set_entity_visibility(ptr, ir_visibility_private);
5518         add_entity_linkage(ptr, IR_LINKAGE_CONSTANT|IR_LINKAGE_HIDDEN_USER);
5519         set_atomic_ent_value(ptr, val);
5520 }
5521
5522 /**
5523  * Generate possible IJmp branches to a given label block.
5524  */
5525 static void gen_ijmp_branches(ir_node *block)
5526 {
5527         ir_node *ijmp;
5528         for (ijmp = ijmp_list; ijmp != NULL; ijmp = get_irn_link(ijmp)) {
5529                 add_immBlock_pred(block, ijmp);
5530         }
5531 }
5532
5533 /**
5534  * Create code for a function and all inner functions.
5535  *
5536  * @param entity  the function entity
5537  */
5538 static void create_function(entity_t *entity)
5539 {
5540         assert(entity->kind == ENTITY_FUNCTION);
5541         ir_entity *function_entity = get_function_entity(entity, current_outer_frame);
5542
5543         if (entity->function.statement == NULL)
5544                 return;
5545
5546         inner_functions     = NULL;
5547         current_trampolines = NULL;
5548
5549         if (entity->declaration.modifiers & DM_CONSTRUCTOR) {
5550                 ir_type *segment = get_segment_type(IR_SEGMENT_CONSTRUCTORS);
5551                 add_function_pointer(segment, function_entity, "constructor_ptr.%u");
5552         }
5553         if (entity->declaration.modifiers & DM_DESTRUCTOR) {
5554                 ir_type *segment = get_segment_type(IR_SEGMENT_DESTRUCTORS);
5555                 add_function_pointer(segment, function_entity, "destructor_ptr.%u");
5556         }
5557
5558         current_function_entity = entity;
5559         current_function_name   = NULL;
5560         current_funcsig         = NULL;
5561
5562         assert(all_labels == NULL);
5563         all_labels = NEW_ARR_F(label_t *, 0);
5564         ijmp_list  = NULL;
5565
5566         int       n_local_vars = get_function_n_local_vars(entity);
5567         ir_graph *irg          = new_ir_graph(function_entity, n_local_vars);
5568         current_ir_graph = irg;
5569
5570         ir_graph *old_current_function = current_function;
5571         current_function = irg;
5572
5573         ir_entity *const old_current_vararg_entity = current_vararg_entity;
5574         current_vararg_entity = NULL;
5575
5576         set_irg_fp_model(irg, firm_fp_model);
5577         tarval_enable_fp_ops(1);
5578         set_irn_dbg_info(get_irg_start_block(irg),
5579                          get_entity_dbg_info(function_entity));
5580
5581         /* set inline flags */
5582         if (entity->function.is_inline)
5583                 set_irg_inline_property(irg, irg_inline_recomended);
5584         handle_decl_modifier_irg(irg, entity->declaration.modifiers);
5585
5586         next_value_number_function = 0;
5587         initialize_function_parameters(entity);
5588         current_static_link = entity->function.static_link;
5589
5590         statement_to_firm(entity->function.statement);
5591
5592         ir_node *end_block = get_irg_end_block(irg);
5593
5594         /* do we have a return statement yet? */
5595         if (currently_reachable()) {
5596                 type_t *type = skip_typeref(entity->declaration.type);
5597                 assert(is_type_function(type));
5598                 const function_type_t *func_type   = &type->function;
5599                 const type_t          *return_type
5600                         = skip_typeref(func_type->return_type);
5601
5602                 ir_node *ret;
5603                 if (is_type_void(return_type)) {
5604                         ret = new_Return(get_store(), 0, NULL);
5605                 } else {
5606                         ir_mode *mode;
5607                         if (is_type_scalar(return_type)) {
5608                                 mode = get_ir_mode_storage(func_type->return_type);
5609                         } else {
5610                                 mode = mode_P_data;
5611                         }
5612
5613                         ir_node *in[1];
5614                         /* §5.1.2.2.3 main implicitly returns 0 */
5615                         if (is_main(entity)) {
5616                                 in[0] = new_Const(get_mode_null(mode));
5617                         } else {
5618                                 in[0] = new_Unknown(mode);
5619                         }
5620                         ret = new_Return(get_store(), 1, in);
5621                 }
5622                 add_immBlock_pred(end_block, ret);
5623         }
5624
5625         for (int i = ARR_LEN(all_labels) - 1; i >= 0; --i) {
5626                 label_t *label = all_labels[i];
5627                 if (label->address_taken) {
5628                         gen_ijmp_branches(label->block);
5629                 }
5630                 mature_immBlock(label->block);
5631         }
5632
5633         DEL_ARR_F(all_labels);
5634         all_labels = NULL;
5635
5636         irg_finalize_cons(irg);
5637
5638         /* finalize the frame type */
5639         ir_type *frame_type = get_irg_frame_type(irg);
5640         int      n          = get_compound_n_members(frame_type);
5641         int      align_all  = 4;
5642         int      offset     = 0;
5643         for (int i = 0; i < n; ++i) {
5644                 ir_entity *member      = get_compound_member(frame_type, i);
5645                 ir_type   *entity_type = get_entity_type(member);
5646
5647                 int align = get_type_alignment_bytes(entity_type);
5648                 if (align > align_all)
5649                         align_all = align;
5650                 int misalign = 0;
5651                 if (align > 0) {
5652                         misalign  = offset % align;
5653                         if (misalign > 0) {
5654                                 offset += align - misalign;
5655                         }
5656                 }
5657
5658                 set_entity_offset(member, offset);
5659                 offset += get_type_size_bytes(entity_type);
5660         }
5661         set_type_size_bytes(frame_type, offset);
5662         set_type_alignment_bytes(frame_type, align_all);
5663
5664         irg_verify(irg, VERIFY_ENFORCE_SSA);
5665         current_vararg_entity = old_current_vararg_entity;
5666         current_function      = old_current_function;
5667
5668         if (current_trampolines != NULL) {
5669                 DEL_ARR_F(current_trampolines);
5670                 current_trampolines = NULL;
5671         }
5672
5673         /* create inner functions if any */
5674         entity_t **inner = inner_functions;
5675         if (inner != NULL) {
5676                 ir_type *rem_outer_frame      = current_outer_frame;
5677                 current_outer_frame           = get_irg_frame_type(current_ir_graph);
5678                 for (int i = ARR_LEN(inner) - 1; i >= 0; --i) {
5679                         create_function(inner[i]);
5680                 }
5681                 DEL_ARR_F(inner);
5682
5683                 current_outer_frame      = rem_outer_frame;
5684         }
5685 }
5686
5687 static void scope_to_firm(scope_t *scope)
5688 {
5689         /* first pass: create declarations */
5690         entity_t *entity = scope->entities;
5691         for ( ; entity != NULL; entity = entity->base.next) {
5692                 if (entity->base.symbol == NULL)
5693                         continue;
5694
5695                 if (entity->kind == ENTITY_FUNCTION) {
5696                         if (entity->function.btk != BUILTIN_NONE) {
5697                                 /* builtins have no representation */
5698                                 continue;
5699                         }
5700                         (void)get_function_entity(entity, NULL);
5701                 } else if (entity->kind == ENTITY_VARIABLE) {
5702                         create_global_variable(entity);
5703                 } else if (entity->kind == ENTITY_NAMESPACE) {
5704                         scope_to_firm(&entity->namespacee.members);
5705                 }
5706         }
5707
5708         /* second pass: create code/initializers */
5709         entity = scope->entities;
5710         for ( ; entity != NULL; entity = entity->base.next) {
5711                 if (entity->base.symbol == NULL)
5712                         continue;
5713
5714                 if (entity->kind == ENTITY_FUNCTION) {
5715                         if (entity->function.btk != BUILTIN_NONE) {
5716                                 /* builtins have no representation */
5717                                 continue;
5718                         }
5719                         create_function(entity);
5720                 } else if (entity->kind == ENTITY_VARIABLE) {
5721                         assert(entity->declaration.kind
5722                                         == DECLARATION_KIND_GLOBAL_VARIABLE);
5723                         current_ir_graph = get_const_code_irg();
5724                         create_variable_initializer(entity);
5725                 }
5726         }
5727 }
5728
5729 void init_ast2firm(void)
5730 {
5731         obstack_init(&asm_obst);
5732         init_atomic_modes();
5733
5734         ir_set_debug_retrieve(dbg_retrieve);
5735         ir_set_type_debug_retrieve(dbg_print_type_dbg_info);
5736
5737         /* create idents for all known runtime functions */
5738         for (size_t i = 0; i < lengthof(rts_data); ++i) {
5739                 rts_idents[i] = new_id_from_str(rts_data[i].name);
5740         }
5741
5742         entitymap_init(&entitymap);
5743 }
5744
5745 static void init_ir_types(void)
5746 {
5747         static int ir_types_initialized = 0;
5748         if (ir_types_initialized)
5749                 return;
5750         ir_types_initialized = 1;
5751
5752         ir_type_char       = get_ir_type(type_char);
5753         ir_type_const_char = get_ir_type(type_const_char);
5754         ir_type_wchar_t    = get_ir_type(type_wchar_t);
5755
5756         be_params             = be_get_backend_param();
5757         mode_float_arithmetic = be_params->mode_float_arithmetic;
5758
5759         stack_param_align     = be_params->stack_param_align;
5760 }
5761
5762 void exit_ast2firm(void)
5763 {
5764         entitymap_destroy(&entitymap);
5765         obstack_free(&asm_obst, NULL);
5766 }
5767
5768 static void global_asm_to_firm(statement_t *s)
5769 {
5770         for (; s != NULL; s = s->base.next) {
5771                 assert(s->kind == STATEMENT_ASM);
5772
5773                 char const *const text = s->asms.asm_text.begin;
5774                 size_t            size = s->asms.asm_text.size;
5775
5776                 /* skip the last \0 */
5777                 if (text[size - 1] == '\0')
5778                         --size;
5779
5780                 ident *const id = new_id_from_chars(text, size);
5781                 add_irp_asm(id);
5782         }
5783 }
5784
5785 static const char *get_cwd(void)
5786 {
5787         static char buf[1024];
5788         if (buf[0] == '\0')
5789                 getcwd(buf, sizeof(buf));
5790         return buf;
5791 }
5792
5793 void translation_unit_to_firm(translation_unit_t *unit)
5794 {
5795         if (c_mode & _CXX) {
5796                 be_dwarf_set_source_language(DW_LANG_C_plus_plus);
5797         } else if (c_mode & _C99) {
5798                 be_dwarf_set_source_language(DW_LANG_C99);
5799         } else if (c_mode & _C89) {
5800                 be_dwarf_set_source_language(DW_LANG_C89);
5801         } else {
5802                 be_dwarf_set_source_language(DW_LANG_C);
5803         }
5804         be_dwarf_set_compilation_directory(get_cwd());
5805
5806         /* initialize firm arithmetic */
5807         tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
5808         ir_set_uninitialized_local_variable_func(uninitialized_local_var);
5809
5810         /* just to be sure */
5811         continue_label           = NULL;
5812         break_label              = NULL;
5813         current_switch           = NULL;
5814         current_translation_unit = unit;
5815
5816         init_ir_types();
5817
5818         scope_to_firm(&unit->scope);
5819         global_asm_to_firm(unit->global_asm);
5820
5821         current_ir_graph         = NULL;
5822         current_translation_unit = NULL;
5823 }