nsz Git - cparser/blob - ast2firm.c

   1 /*
   2  * This file is part of cparser.
   3  * Copyright (C) 2007-2009 Matthias Braun <matze@braunis.de>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  18  * 02111-1307, USA.
  19  */
  20 #include <config.h>
  21
  22 #include <assert.h>
  23 #include <string.h>
  24 #include <stdbool.h>
  25 #include <limits.h>
  26
  27 #include <libfirm/firm.h>
  28 #include <libfirm/adt/obst.h>
  29 #include <libfirm/be.h>
  30
  31 #include "ast2firm.h"
  32
  33 #include "adt/error.h"
  34 #include "adt/array.h"
  35 #include "adt/strutil.h"
  36 #include "adt/util.h"
  37 #include "symbol_t.h"
  38 #include "token_t.h"
  39 #include "type_t.h"
  40 #include "ast_t.h"
  41 #include "entity_t.h"
  42 #include "parser.h"
  43 #include "diagnostic.h"
  44 #include "lang_features.h"
  45 #include "types.h"
  46 #include "type_hash.h"
  47 #include "mangle.h"
  48 #include "walk.h"
  49 #include "warning.h"
  50 #include "printer.h"
  51 #include "entitymap_t.h"
  52 #include "driver/firm_opt.h"
  53
  54 typedef struct trampoline_region trampoline_region;
  55 struct trampoline_region {
  56         ir_entity        *function;    /**< The function that is called by this trampoline */
  57         ir_entity        *region;      /**< created region for the trampoline */
  58 };
  59
  60 fp_model_t firm_fp_model = fp_model_precise;
  61
  62 static const backend_params *be_params;
  63
  64 static ir_type *ir_type_char;
  65 static ir_type *ir_type_const_char;
  66 static ir_type *ir_type_wchar_t;
  67 static ir_type *ir_type_void;
  68 static ir_type *ir_type_int;
  69
  70 /* architecture specific floating point arithmetic mode (if any) */
  71 static ir_mode *mode_float_arithmetic;
  72
  73 /* alignment of stack parameters */
  74 static unsigned stack_param_align;
  75
  76 static int        next_value_number_function;
  77 static ir_node   *continue_label;
  78 static ir_node   *break_label;
  79 static ir_node   *current_switch;
  80 static bool       saw_default_label;
  81 static label_t  **all_labels;
  82 static entity_t **inner_functions;
  83 static ir_node   *ijmp_list;
  84 static bool       constant_folding;
  85
  86 static const entity_t     *current_function_entity;
  87 static ir_node            *current_function_name;
  88 static ir_node            *current_funcsig;
  89 static ir_graph           *current_function;
  90 static translation_unit_t *current_translation_unit;
  91 static trampoline_region  *current_trampolines;
  92 static ir_type            *current_outer_frame;
  93 static ir_node            *current_static_link;
  94 static ir_entity          *current_vararg_entity;
  95
  96 static entitymap_t  entitymap;
  97
  98 static struct obstack asm_obst;
  99
 100 typedef enum declaration_kind_t {
 101         DECLARATION_KIND_UNKNOWN,
 102         DECLARATION_KIND_VARIABLE_LENGTH_ARRAY,
 103         DECLARATION_KIND_GLOBAL_VARIABLE,
 104         DECLARATION_KIND_LOCAL_VARIABLE,
 105         DECLARATION_KIND_LOCAL_VARIABLE_ENTITY,
 106         DECLARATION_KIND_PARAMETER,
 107         DECLARATION_KIND_PARAMETER_ENTITY,
 108         DECLARATION_KIND_FUNCTION,
 109         DECLARATION_KIND_COMPOUND_MEMBER,
 110         DECLARATION_KIND_INNER_FUNCTION
 111 } declaration_kind_t;
 112
 113 static ir_type *get_ir_type_incomplete(type_t *type);
 114
 115 static void enqueue_inner_function(entity_t *entity)
 116 {
 117         if (inner_functions == NULL)
 118                 inner_functions = NEW_ARR_F(entity_t *, 0);
 119         ARR_APP1(entity_t*, inner_functions, entity);
 120 }
 121
 122 static ir_node *uninitialized_local_var(ir_graph *irg, ir_mode *mode, int pos)
 123 {
 124         const entity_t *entity = get_irg_loc_description(irg, pos);
 125
 126         if (entity != NULL) {
 127                 source_position_t const *const pos = &entity->base.source_position;
 128                 warningf(WARN_UNINITIALIZED, pos, "'%N' might be used uninitialized", entity);
 129         }
 130         return new_r_Unknown(irg, mode);
 131 }
 132
 133 static const char *dbg_retrieve(const dbg_info *dbg, unsigned *line)
 134 {
 135         const source_position_t *pos = (const source_position_t*) dbg;
 136         if (pos == NULL)
 137                 return NULL;
 138         if (line != NULL)
 139                 *line = pos->lineno;
 140         return pos->input_name;
 141 }
 142
 143 static dbg_info *get_dbg_info(const source_position_t *pos)
 144 {
 145         return (dbg_info*) pos;
 146 }
 147
 148 static void dbg_print_type_dbg_info(char *buffer, size_t buffer_size,
 149                                     const type_dbg_info *dbg)
 150 {
 151         assert(dbg != NULL);
 152         print_to_buffer(buffer, buffer_size);
 153         const type_t *type = (const type_t*) dbg;
 154         print_type(type);
 155         finish_print_to_buffer();
 156 }
 157
 158 static type_dbg_info *get_type_dbg_info_(const type_t *type)
 159 {
 160         return (type_dbg_info*) type;
 161 }
 162
 163 /* is the current block a reachable one? */
 164 static bool currently_reachable(void)
 165 {
 166         ir_node *const block = get_cur_block();
 167         return block != NULL && !is_Bad(block);
 168 }
 169
 170 static void set_unreachable_now(void)
 171 {
 172         set_cur_block(NULL);
 173 }
 174
 175 ir_mode *atomic_modes[ATOMIC_TYPE_LAST+1];
 176
 177 static ir_node *_expression_to_firm(const expression_t *expression);
 178 static ir_node *expression_to_firm(const expression_t *expression);
 179 static void create_local_declaration(entity_t *entity);
 180
 181 static unsigned decide_modulo_shift(unsigned type_size)
 182 {
 183         if (architecture_modulo_shift == 0)
 184                 return 0;
 185         if (type_size < architecture_modulo_shift)
 186                 return architecture_modulo_shift;
 187         return type_size;
 188 }
 189
 190 static ir_mode *init_atomic_ir_mode(atomic_type_kind_t kind)
 191 {
 192         unsigned flags = get_atomic_type_flags(kind);
 193         unsigned size  = get_atomic_type_size(kind);
 194         if ((flags & ATOMIC_TYPE_FLAG_FLOAT)
 195             && !(flags & ATOMIC_TYPE_FLAG_COMPLEX)) {
 196                 if (size == 4) {
 197                         return get_modeF();
 198                 } else if (size == 8) {
 199                         return get_modeD();
 200                 } else {
 201                         panic("unexpected kind");
 202                 }
 203         } else if (flags & ATOMIC_TYPE_FLAG_INTEGER) {
 204                 char            name[64];
 205                 unsigned        bit_size     = size * 8;
 206                 bool            is_signed    = (flags & ATOMIC_TYPE_FLAG_SIGNED) != 0;
 207                 unsigned        modulo_shift = decide_modulo_shift(bit_size);
 208
 209                 snprintf(name, sizeof(name), "%s%u", is_signed ? "I" : "U", bit_size);
 210                 return new_int_mode(name, irma_twos_complement, bit_size, is_signed,
 211                                     modulo_shift);
 212         }
 213
 214         return NULL;
 215 }
 216
 217 /**
 218  * Initialises the atomic modes depending on the machine size.
 219  */
 220 static void init_atomic_modes(void)
 221 {
 222         atomic_modes[ATOMIC_TYPE_VOID] = mode_ANY;
 223         for (int i = 0; i <= ATOMIC_TYPE_LAST; ++i) {
 224                 if (atomic_modes[i] != NULL)
 225                         continue;
 226                 atomic_modes[i] = init_atomic_ir_mode((atomic_type_kind_t) i);
 227         }
 228 }
 229
 230 ir_mode *get_atomic_mode(atomic_type_kind_t kind)
 231 {
 232         assert(kind <= ATOMIC_TYPE_LAST);
 233         return atomic_modes[kind];
 234 }
 235
 236 static ir_node *get_vla_size(array_type_t *const type)
 237 {
 238         ir_node *size_node = type->size_node;
 239         if (size_node == NULL) {
 240                 size_node = expression_to_firm(type->size_expression);
 241                 type->size_node = size_node;
 242         }
 243         return size_node;
 244 }
 245
 246 static unsigned count_parameters(const function_type_t *function_type)
 247 {
 248         unsigned count = 0;
 249
 250         function_parameter_t *parameter = function_type->parameters;
 251         for ( ; parameter != NULL; parameter = parameter->next) {
 252                 ++count;
 253         }
 254
 255         return count;
 256 }
 257
 258 /**
 259  * Creates a Firm type for an atomic type
 260  */
 261 static ir_type *create_atomic_type(atomic_type_kind_t akind, const type_t *type)
 262 {
 263         ir_mode        *mode      = atomic_modes[akind];
 264         type_dbg_info  *dbgi      = get_type_dbg_info_(type);
 265         ir_type        *irtype    = new_d_type_primitive(mode, dbgi);
 266         il_alignment_t  alignment = get_atomic_type_alignment(akind);
 267
 268         set_type_size_bytes(irtype, get_atomic_type_size(akind));
 269         set_type_alignment_bytes(irtype, alignment);
 270
 271         return irtype;
 272 }
 273
 274 /**
 275  * Creates a Firm type for a complex type
 276  */
 277 static ir_type *create_complex_type(const atomic_type_t *type)
 278 {
 279         atomic_type_kind_t  kind = type->akind;
 280         ir_mode            *mode = atomic_modes[kind];
 281         ident              *id   = get_mode_ident(mode);
 282
 283         (void) id;
 284
 285         /* FIXME: finish the array */
 286         return NULL;
 287 }
 288
 289 /**
 290  * Creates a Firm type for an imaginary type
 291  */
 292 static ir_type *create_imaginary_type(const atomic_type_t *type)
 293 {
 294         return create_atomic_type(type->akind, (const type_t*)type);
 295 }
 296
 297 /**
 298  * return type of a parameter (and take transparent union gnu extension into
 299  * account)
 300  */
 301 static type_t *get_parameter_type(type_t *orig_type)
 302 {
 303         type_t *type = skip_typeref(orig_type);
 304         if (is_type_union(type)
 305                         && get_type_modifiers(orig_type) & DM_TRANSPARENT_UNION) {
 306                 compound_t *compound = type->compound.compound;
 307                 type                 = compound->members.entities->declaration.type;
 308         }
 309
 310         return type;
 311 }
 312
 313 static ir_type *create_method_type(const function_type_t *function_type, bool for_closure)
 314 {
 315         type_t        *return_type  = skip_typeref(function_type->return_type);
 316
 317         int            n_parameters = count_parameters(function_type)
 318                                        + (for_closure ? 1 : 0);
 319         int            n_results    = return_type == type_void ? 0 : 1;
 320         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) function_type);
 321         ir_type       *irtype       = new_d_type_method(n_parameters, n_results, dbgi);
 322
 323         if (return_type != type_void) {
 324                 ir_type *restype = get_ir_type(return_type);
 325                 set_method_res_type(irtype, 0, restype);
 326         }
 327
 328         function_parameter_t *parameter = function_type->parameters;
 329         int                   n         = 0;
 330         if (for_closure) {
 331                 ir_type *p_irtype = get_ir_type(type_void_ptr);
 332                 set_method_param_type(irtype, n, p_irtype);
 333                 ++n;
 334         }
 335         for ( ; parameter != NULL; parameter = parameter->next) {
 336                 type_t  *type     = get_parameter_type(parameter->type);
 337                 ir_type *p_irtype = get_ir_type(type);
 338                 set_method_param_type(irtype, n, p_irtype);
 339                 ++n;
 340         }
 341
 342         bool is_variadic = function_type->variadic;
 343
 344         if (is_variadic)
 345                 set_method_variadicity(irtype, variadicity_variadic);
 346
 347         unsigned cc = get_method_calling_convention(irtype);
 348         switch (function_type->calling_convention) {
 349         case CC_DEFAULT: /* unspecified calling convention, equal to one of the other, typically cdecl */
 350         case CC_CDECL:
 351 is_cdecl:
 352                 set_method_calling_convention(irtype, SET_CDECL(cc));
 353                 break;
 354
 355         case CC_STDCALL:
 356                 if (is_variadic)
 357                         goto is_cdecl;
 358
 359                 /* only non-variadic function can use stdcall, else use cdecl */
 360                 set_method_calling_convention(irtype, SET_STDCALL(cc));
 361                 break;
 362
 363         case CC_FASTCALL:
 364                 if (is_variadic)
 365                         goto is_cdecl;
 366                 /* only non-variadic function can use fastcall, else use cdecl */
 367                 set_method_calling_convention(irtype, SET_FASTCALL(cc));
 368                 break;
 369
 370         case CC_THISCALL:
 371                 /* Hmm, leave default, not accepted by the parser yet. */
 372                 break;
 373         }
 374
 375         if (for_closure)
 376                 set_method_calling_convention(irtype, get_method_calling_convention(irtype) | cc_this_call);
 377
 378         const decl_modifiers_t modifiers = function_type->modifiers;
 379         if (modifiers & DM_CONST)
 380                 add_method_additional_properties(irtype, mtp_property_const);
 381         if (modifiers & DM_PURE)
 382                 add_method_additional_properties(irtype, mtp_property_pure);
 383         if (modifiers & DM_RETURNS_TWICE)
 384                 add_method_additional_properties(irtype, mtp_property_returns_twice);
 385         if (modifiers & DM_NORETURN)
 386                 add_method_additional_properties(irtype, mtp_property_noreturn);
 387         if (modifiers & DM_NOTHROW)
 388                 add_method_additional_properties(irtype, mtp_property_nothrow);
 389         if (modifiers & DM_MALLOC)
 390                 add_method_additional_properties(irtype, mtp_property_malloc);
 391
 392         return irtype;
 393 }
 394
 395 static ir_type *create_pointer_type(pointer_type_t *type)
 396 {
 397         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) type);
 398         type_t        *points_to    = type->points_to;
 399         ir_type       *ir_points_to = get_ir_type_incomplete(points_to);
 400         ir_type       *irtype       = new_d_type_pointer(ir_points_to, dbgi);
 401
 402         return irtype;
 403 }
 404
 405 static ir_type *create_reference_type(reference_type_t *type)
 406 {
 407         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) type);
 408         type_t        *refers_to    = type->refers_to;
 409         ir_type       *ir_refers_to = get_ir_type_incomplete(refers_to);
 410         ir_type       *irtype       = new_d_type_pointer(ir_refers_to, dbgi);
 411
 412         return irtype;
 413 }
 414
 415 static ir_type *create_array_type(array_type_t *type)
 416 {
 417         type_dbg_info *dbgi            = get_type_dbg_info_((const type_t*) type);
 418         type_t        *element_type    = type->element_type;
 419         ir_type       *ir_element_type = get_ir_type(element_type);
 420         ir_type       *irtype          = new_d_type_array(1, ir_element_type, dbgi);
 421
 422         const int align = get_type_alignment_bytes(ir_element_type);
 423         set_type_alignment_bytes(irtype, align);
 424
 425         if (type->size_constant) {
 426                 int n_elements = type->size;
 427
 428                 set_array_bounds_int(irtype, 0, 0, n_elements);
 429
 430                 size_t elemsize = get_type_size_bytes(ir_element_type);
 431                 if (elemsize % align > 0) {
 432                         elemsize += align - (elemsize % align);
 433                 }
 434                 set_type_size_bytes(irtype, n_elements * elemsize);
 435         } else {
 436                 set_array_lower_bound_int(irtype, 0, 0);
 437         }
 438         set_type_state(irtype, layout_fixed);
 439
 440         return irtype;
 441 }
 442
 443 /**
 444  * Return the signed integer type of size bits.
 445  *
 446  * @param size   the size
 447  */
 448 static ir_type *get_signed_int_type_for_bit_size(ir_type *base_tp,
 449                                                  unsigned size,
 450                                                                                                  const type_t *type)
 451 {
 452         static ir_mode *s_modes[64 + 1] = {NULL, };
 453         ir_type *res;
 454         ir_mode *mode;
 455
 456         if (size <= 0 || size > 64)
 457                 return NULL;
 458
 459         mode = s_modes[size];
 460         if (mode == NULL) {
 461                 char name[32];
 462
 463                 snprintf(name, sizeof(name), "bf_I%u", size);
 464                 mode = new_int_mode(name, irma_twos_complement, size, 1, 0);
 465                 s_modes[size] = mode;
 466         }
 467
 468         type_dbg_info *dbgi = get_type_dbg_info_(type);
 469         res                 = new_d_type_primitive(mode, dbgi);
 470         set_primitive_base_type(res, base_tp);
 471
 472         return res;
 473 }
 474
 475 /**
 476  * Return the unsigned integer type of size bits.
 477  *
 478  * @param size   the size
 479  */
 480 static ir_type *get_unsigned_int_type_for_bit_size(ir_type *base_tp,
 481                                                    unsigned size,
 482                                                                                                    const type_t *type)
 483 {
 484         static ir_mode *u_modes[64 + 1] = {NULL, };
 485         ir_type *res;
 486         ir_mode *mode;
 487
 488         if (size <= 0 || size > 64)
 489                 return NULL;
 490
 491         mode = u_modes[size];
 492         if (mode == NULL) {
 493                 char name[32];
 494
 495                 snprintf(name, sizeof(name), "bf_U%u", size);
 496                 mode = new_int_mode(name, irma_twos_complement, size, 0, 0);
 497                 u_modes[size] = mode;
 498         }
 499
 500         type_dbg_info *dbgi = get_type_dbg_info_(type);
 501         res = new_d_type_primitive(mode, dbgi);
 502         set_primitive_base_type(res, base_tp);
 503
 504         return res;
 505 }
 506
 507 static ir_type *create_bitfield_type(const entity_t *entity)
 508 {
 509         assert(entity->kind == ENTITY_COMPOUND_MEMBER);
 510         type_t *base = skip_typeref(entity->declaration.type);
 511         assert(base->kind == TYPE_ATOMIC || base->kind == TYPE_ENUM);
 512         ir_type *irbase = get_ir_type(base);
 513
 514         unsigned bit_size = entity->compound_member.bit_size;
 515
 516         assert(!is_type_float(base));
 517         if (is_type_signed(base)) {
 518                 return get_signed_int_type_for_bit_size(irbase, bit_size, base);
 519         } else {
 520                 return get_unsigned_int_type_for_bit_size(irbase, bit_size, base);
 521         }
 522 }
 523
 524 #define INVALID_TYPE ((ir_type*)-1)
 525
 526 enum {
 527         COMPOUND_IS_STRUCT = false,
 528         COMPOUND_IS_UNION  = true
 529 };
 530
 531 /**
 532  * Construct firm type from ast struct type.
 533  */
 534 static ir_type *create_compound_type(compound_type_t *type,
 535                                      bool incomplete, bool is_union)
 536 {
 537         compound_t *compound = type->compound;
 538
 539         if (compound->irtype != NULL && (compound->irtype_complete || incomplete)) {
 540                 return compound->irtype;
 541         }
 542
 543         symbol_t *type_symbol = compound->base.symbol;
 544         ident    *id;
 545         if (type_symbol != NULL) {
 546                 id = new_id_from_str(type_symbol->string);
 547         } else {
 548                 if (is_union) {
 549                         id = id_unique("__anonymous_union.%u");
 550                 } else {
 551                         id = id_unique("__anonymous_struct.%u");
 552                 }
 553         }
 554
 555         ir_type *irtype;
 556         if (is_union) {
 557                 irtype = new_type_union(id);
 558         } else {
 559                 irtype = new_type_struct(id);
 560         }
 561
 562         compound->irtype_complete = false;
 563         compound->irtype          = irtype;
 564
 565         if (incomplete)
 566                 return irtype;
 567
 568         if (is_union) {
 569                 layout_union_type(type);
 570         } else {
 571                 layout_struct_type(type);
 572         }
 573
 574         compound->irtype_complete = true;
 575
 576         entity_t *entry = compound->members.entities;
 577         for ( ; entry != NULL; entry = entry->base.next) {
 578                 if (entry->kind != ENTITY_COMPOUND_MEMBER)
 579                         continue;
 580
 581                 symbol_t *symbol     = entry->base.symbol;
 582                 type_t   *entry_type = entry->declaration.type;
 583                 ident    *ident;
 584                 if (symbol == NULL) {
 585                         /* anonymous bitfield member, skip */
 586                         if (entry->compound_member.bitfield)
 587                                 continue;
 588                         assert(entry_type->kind == TYPE_COMPOUND_STRUCT
 589                                         || entry_type->kind == TYPE_COMPOUND_UNION);
 590                         ident = id_unique("anon.%u");
 591                 } else {
 592                         ident = new_id_from_str(symbol->string);
 593                 }
 594
 595                 dbg_info *dbgi       = get_dbg_info(&entry->base.source_position);
 596
 597                 ir_type *entry_irtype;
 598                 if (entry->compound_member.bitfield) {
 599                         entry_irtype = create_bitfield_type(entry);
 600                 } else {
 601                         entry_irtype = get_ir_type(entry_type);
 602                 }
 603                 ir_entity *entity = new_d_entity(irtype, ident, entry_irtype, dbgi);
 604
 605                 set_entity_offset(entity, entry->compound_member.offset);
 606                 set_entity_offset_bits_remainder(entity,
 607                                                  entry->compound_member.bit_offset);
 608
 609                 assert(entry->declaration.kind == DECLARATION_KIND_UNKNOWN);
 610                 entry->declaration.kind       = DECLARATION_KIND_COMPOUND_MEMBER;
 611                 entry->compound_member.entity = entity;
 612         }
 613
 614         set_type_alignment_bytes(irtype, compound->alignment);
 615         set_type_size_bytes(irtype, compound->size);
 616         set_type_state(irtype, layout_fixed);
 617
 618         return irtype;
 619 }
 620
 621 static void determine_enum_values(enum_type_t *const type)
 622 {
 623         ir_mode   *const mode    = atomic_modes[type->base.akind];
 624         ir_tarval *const one     = get_mode_one(mode);
 625         ir_tarval *      tv_next = get_mode_null(mode);
 626
 627         bool constant_folding_old = constant_folding;
 628         constant_folding = true;
 629
 630         enum_t   *enume = type->enume;
 631         entity_t *entry = enume->base.next;
 632         for (; entry != NULL; entry = entry->base.next) {
 633                 if (entry->kind != ENTITY_ENUM_VALUE)
 634                         break;
 635
 636                 expression_t *const init = entry->enum_value.value;
 637                 if (init != NULL) {
 638                         ir_node *const cnst = expression_to_firm(init);
 639                         if (!is_Const(cnst)) {
 640                                 panic("couldn't fold constant");
 641                         }
 642                         tv_next = get_Const_tarval(cnst);
 643                 }
 644                 assert(entry->enum_value.tv == NULL || entry->enum_value.tv == tv_next);
 645                 entry->enum_value.tv = tv_next;
 646                 tv_next = tarval_add(tv_next, one);
 647         }
 648
 649         constant_folding = constant_folding_old;
 650 }
 651
 652 static ir_type *create_enum_type(enum_type_t *const type)
 653 {
 654         return create_atomic_type(type->base.akind, (const type_t*) type);
 655 }
 656
 657 static ir_type *get_ir_type_incomplete(type_t *type)
 658 {
 659         assert(type != NULL);
 660         type = skip_typeref(type);
 661
 662         if (type->base.firm_type != NULL) {
 663                 assert(type->base.firm_type != INVALID_TYPE);
 664                 return type->base.firm_type;
 665         }
 666
 667         switch (type->kind) {
 668         case TYPE_COMPOUND_STRUCT:
 669                 return create_compound_type(&type->compound, true, COMPOUND_IS_STRUCT);
 670         case TYPE_COMPOUND_UNION:
 671                 return create_compound_type(&type->compound, true, COMPOUND_IS_UNION);
 672         default:
 673                 return get_ir_type(type);
 674         }
 675 }
 676
 677 ir_type *get_ir_type(type_t *type)
 678 {
 679         assert(type != NULL);
 680
 681         type = skip_typeref(type);
 682
 683         if (type->base.firm_type != NULL) {
 684                 assert(type->base.firm_type != INVALID_TYPE);
 685                 return type->base.firm_type;
 686         }
 687
 688         ir_type *firm_type = NULL;
 689         switch (type->kind) {
 690         case TYPE_ERROR:
 691                 /* Happens while constant folding, when there was an error */
 692                 return create_atomic_type(ATOMIC_TYPE_VOID, NULL);
 693
 694         case TYPE_ATOMIC:
 695                 firm_type = create_atomic_type(type->atomic.akind, type);
 696                 break;
 697         case TYPE_COMPLEX:
 698                 firm_type = create_complex_type(&type->atomic);
 699                 break;
 700         case TYPE_IMAGINARY:
 701                 firm_type = create_imaginary_type(&type->atomic);
 702                 break;
 703         case TYPE_FUNCTION:
 704                 firm_type = create_method_type(&type->function, false);
 705                 break;
 706         case TYPE_POINTER:
 707                 firm_type = create_pointer_type(&type->pointer);
 708                 break;
 709         case TYPE_REFERENCE:
 710                 firm_type = create_reference_type(&type->reference);
 711                 break;
 712         case TYPE_ARRAY:
 713                 firm_type = create_array_type(&type->array);
 714                 break;
 715         case TYPE_COMPOUND_STRUCT:
 716                 firm_type = create_compound_type(&type->compound, false, COMPOUND_IS_STRUCT);
 717                 break;
 718         case TYPE_COMPOUND_UNION:
 719                 firm_type = create_compound_type(&type->compound, false, COMPOUND_IS_UNION);
 720                 break;
 721         case TYPE_ENUM:
 722                 firm_type = create_enum_type(&type->enumt);
 723                 break;
 724
 725         case TYPE_TYPEOF:
 726         case TYPE_TYPEDEF:
 727                 break;
 728         }
 729         if (firm_type == NULL)
 730                 panic("unknown type found");
 731
 732         type->base.firm_type = firm_type;
 733         return firm_type;
 734 }
 735
 736 static ir_mode *get_ir_mode_storage(type_t *type)
 737 {
 738         ir_type *irtype = get_ir_type(type);
 739
 740         /* firm doesn't report a mode for arrays somehow... */
 741         if (is_Array_type(irtype)) {
 742                 return mode_P_data;
 743         }
 744
 745         ir_mode *mode = get_type_mode(irtype);
 746         assert(mode != NULL);
 747         return mode;
 748 }
 749
 750 /*
 751  * get arithmetic mode for a type. This is different from get_ir_mode_storage,
 752  * int that it returns bigger modes for floating point on some platforms
 753  * (x87 internally does arithemtic with 80bits)
 754  */
 755 static ir_mode *get_ir_mode_arithmetic(type_t *type)
 756 {
 757         ir_mode *mode = get_ir_mode_storage(type);
 758         if (mode_is_float(mode) && mode_float_arithmetic != NULL) {
 759                 return mode_float_arithmetic;
 760         }
 761
 762         return mode;
 763 }
 764
 765 /**
 766  * Return a node representing the size of a type.
 767  */
 768 static ir_node *get_type_size_node(type_t *type)
 769 {
 770         unsigned size;
 771         ir_mode *mode = get_ir_mode_arithmetic(type_size_t);
 772         type = skip_typeref(type);
 773
 774         if (is_type_array(type) && type->array.is_vla) {
 775                 ir_node *size_node = get_vla_size(&type->array);
 776                 ir_node *elem_size = get_type_size_node(type->array.element_type);
 777                 ir_node *real_size = new_d_Mul(NULL, size_node, elem_size, mode);
 778                 return real_size;
 779         }
 780
 781         size = get_type_size(type);
 782         return new_Const_long(mode, size);
 783 }
 784
 785 /** Names of the runtime functions. */
 786 static const struct {
 787         int        id;           /**< the rts id */
 788         int        n_res;        /**< number of return values */
 789         const char *name;        /**< the name of the rts function */
 790         int        n_params;     /**< number of parameters */
 791         unsigned   flags;        /**< language flags */
 792 } rts_data[] = {
 793         { rts_debugbreak, 0, "__debugbreak", 0, _MS },
 794         { rts_abort,      0, "abort",        0, _C89 },
 795         { rts_alloca,     1, "alloca",       1, _ALL },
 796         { rts_abs,        1, "abs",          1, _C89 },
 797         { rts_labs,       1, "labs",         1, _C89 },
 798         { rts_llabs,      1, "llabs",        1, _C99 },
 799         { rts_imaxabs,    1, "imaxabs",      1, _C99 },
 800
 801         { rts_fabs,       1, "fabs",         1, _C89 },
 802         { rts_sqrt,       1, "sqrt",         1, _C89 },
 803         { rts_cbrt,       1, "cbrt",         1, _C99 },
 804         { rts_exp,        1, "exp",          1, _C89 },
 805         { rts_exp2,       1, "exp2",         1, _C89 },
 806         { rts_exp10,      1, "exp10",        1, _GNUC },
 807         { rts_log,        1, "log",          1, _C89 },
 808         { rts_log2,       1, "log2",         1, _C89 },
 809         { rts_log10,      1, "log10",        1, _C89 },
 810         { rts_pow,        1, "pow",          2, _C89 },
 811         { rts_sin,        1, "sin",          1, _C89 },
 812         { rts_cos,        1, "cos",          1, _C89 },
 813         { rts_tan,        1, "tan",          1, _C89 },
 814         { rts_asin,       1, "asin",         1, _C89 },
 815         { rts_acos,       1, "acos",         1, _C89 },
 816         { rts_atan,       1, "atan",         1, _C89 },
 817         { rts_sinh,       1, "sinh",         1, _C89 },
 818         { rts_cosh,       1, "cosh",         1, _C89 },
 819         { rts_tanh,       1, "tanh",         1, _C89 },
 820
 821         { rts_fabsf,      1, "fabsf",        1, _C99 },
 822         { rts_sqrtf,      1, "sqrtf",        1, _C99 },
 823         { rts_cbrtf,      1, "cbrtf",        1, _C99 },
 824         { rts_expf,       1, "expf",         1, _C99 },
 825         { rts_exp2f,      1, "exp2f",        1, _C99 },
 826         { rts_exp10f,     1, "exp10f",       1, _GNUC },
 827         { rts_logf,       1, "logf",         1, _C99 },
 828         { rts_log2f,      1, "log2f",        1, _C99 },
 829         { rts_log10f,     1, "log10f",       1, _C99 },
 830         { rts_powf,       1, "powf",         2, _C99 },
 831         { rts_sinf,       1, "sinf",         1, _C99 },
 832         { rts_cosf,       1, "cosf",         1, _C99 },
 833         { rts_tanf,       1, "tanf",         1, _C99 },
 834         { rts_asinf,      1, "asinf",        1, _C99 },
 835         { rts_acosf,      1, "acosf",        1, _C99 },
 836         { rts_atanf,      1, "atanf",        1, _C99 },
 837         { rts_sinhf,      1, "sinhf",        1, _C99 },
 838         { rts_coshf,      1, "coshf",        1, _C99 },
 839         { rts_tanhf,      1, "tanhf",        1, _C99 },
 840
 841         { rts_fabsl,      1, "fabsl",        1, _C99 },
 842         { rts_sqrtl,      1, "sqrtl",        1, _C99 },
 843         { rts_cbrtl,      1, "cbrtl",        1, _C99 },
 844         { rts_expl,       1, "expl",         1, _C99 },
 845         { rts_exp2l,      1, "exp2l",        1, _C99 },
 846         { rts_exp10l,     1, "exp10l",       1, _GNUC },
 847         { rts_logl,       1, "logl",         1, _C99 },
 848         { rts_log2l,      1, "log2l",        1, _C99 },
 849         { rts_log10l,     1, "log10l",       1, _C99 },
 850         { rts_powl,       1, "powl",         2, _C99 },
 851         { rts_sinl,       1, "sinl",         1, _C99 },
 852         { rts_cosl,       1, "cosl",         1, _C99 },
 853         { rts_tanl,       1, "tanl",         1, _C99 },
 854         { rts_asinl,      1, "asinl",        1, _C99 },
 855         { rts_acosl,      1, "acosl",        1, _C99 },
 856         { rts_atanl,      1, "atanl",        1, _C99 },
 857         { rts_sinhl,      1, "sinhl",        1, _C99 },
 858         { rts_coshl,      1, "coshl",        1, _C99 },
 859         { rts_tanhl,      1, "tanhl",        1, _C99 },
 860
 861         { rts_strcmp,     1, "strcmp",       2, _C89 },
 862         { rts_strncmp,    1, "strncmp",      3, _C89 },
 863         { rts_strcpy,     1, "strcpy",       2, _C89 },
 864         { rts_strlen,     1, "strlen",       1, _C89 },
 865         { rts_memcpy,     1, "memcpy",       3, _C89 },
 866         { rts_mempcpy,    1, "mempcpy",      3, _GNUC },
 867         { rts_memmove,    1, "memmove",      3, _C89 },
 868         { rts_memset,     1, "memset",       3, _C89 },
 869         { rts_memcmp,     1, "memcmp",       3, _C89 },
 870 };
 871
 872 static ident *rts_idents[lengthof(rts_data)];
 873
 874 static create_ld_ident_func create_ld_ident = create_name_linux_elf;
 875
 876 void set_create_ld_ident(ident *(*func)(entity_t*))
 877 {
 878         create_ld_ident = func;
 879 }
 880
 881 /**
 882  * Handle GNU attributes for entities
 883  *
 884  * @param ent   the entity
 885  * @param decl  the routine declaration
 886  */
 887 static void handle_decl_modifiers(ir_entity *irentity, entity_t *entity)
 888 {
 889         assert(is_declaration(entity));
 890         decl_modifiers_t modifiers = entity->declaration.modifiers;
 891
 892         if (is_method_entity(irentity)) {
 893                 if (modifiers & DM_PURE) {
 894                         set_entity_additional_properties(irentity, mtp_property_pure);
 895                 }
 896                 if (modifiers & DM_CONST) {
 897                         add_entity_additional_properties(irentity, mtp_property_const);
 898                 }
 899         }
 900         if (modifiers & DM_USED) {
 901                 add_entity_linkage(irentity, IR_LINKAGE_HIDDEN_USER);
 902         }
 903         if (modifiers & DM_WEAK) {
 904                 add_entity_linkage(irentity, IR_LINKAGE_WEAK);
 905         }
 906 }
 907
 908 static bool is_main(entity_t *entity)
 909 {
 910         static symbol_t *sym_main = NULL;
 911         if (sym_main == NULL) {
 912                 sym_main = symbol_table_insert("main");
 913         }
 914
 915         if (entity->base.symbol != sym_main)
 916                 return false;
 917         /* must be in outermost scope */
 918         if (entity->base.parent_scope != &current_translation_unit->scope)
 919                 return false;
 920
 921         return true;
 922 }
 923
 924 /**
 925  * Creates an entity representing a function.
 926  *
 927  * @param entity       the function declaration/definition
 928  * @param owner_type   the owner type of this function, NULL
 929  *                     for global functions
 930  */
 931 static ir_entity *get_function_entity(entity_t *entity, ir_type *owner_type)
 932 {
 933         assert(entity->kind == ENTITY_FUNCTION);
 934         if (entity->function.irentity != NULL)
 935                 return entity->function.irentity;
 936
 937         switch (entity->function.btk) {
 938         case BUILTIN_NONE:
 939         case BUILTIN_LIBC:
 940         case BUILTIN_LIBC_CHECK:
 941                 break;
 942         default:
 943                 return NULL;
 944         }
 945
 946         if (is_main(entity)) {
 947                 /* force main to C linkage */
 948                 type_t *type = entity->declaration.type;
 949                 assert(is_type_function(type));
 950                 if (type->function.linkage != LINKAGE_C) {
 951                         type_t *new_type           = duplicate_type(type);
 952                         new_type->function.linkage = LINKAGE_C;
 953                         type                       = identify_new_type(new_type);
 954                         entity->declaration.type   = type;
 955                 }
 956         }
 957
 958         symbol_t *symbol = entity->base.symbol;
 959         ident    *id     = new_id_from_str(symbol->string);
 960
 961         /* already an entity defined? */
 962         ir_entity *irentity = entitymap_get(&entitymap, symbol);
 963         bool const has_body = entity->function.statement != NULL;
 964         if (irentity != NULL) {
 965                 if (get_entity_visibility(irentity) == ir_visibility_external
 966                                 && has_body) {
 967                         set_entity_visibility(irentity, ir_visibility_default);
 968                 }
 969                 goto entity_created;
 970         }
 971
 972         ir_type *ir_type_method;
 973         if (entity->function.need_closure)
 974                 ir_type_method = create_method_type(&entity->declaration.type->function, true);
 975         else
 976                 ir_type_method = get_ir_type(entity->declaration.type);
 977
 978         bool nested_function = false;
 979         if (owner_type == NULL)
 980                 owner_type = get_glob_type();
 981         else
 982                 nested_function = true;
 983
 984         dbg_info *const dbgi = get_dbg_info(&entity->base.source_position);
 985         irentity = new_d_entity(owner_type, id, ir_type_method, dbgi);
 986
 987         ident *ld_id;
 988         if (nested_function)
 989                 ld_id = id_unique("inner.%u");
 990         else
 991                 ld_id = create_ld_ident(entity);
 992         set_entity_ld_ident(irentity, ld_id);
 993
 994         handle_decl_modifiers(irentity, entity);
 995
 996         if (! nested_function) {
 997                 /* static inline             => local
 998                  * extern inline             => local
 999                  * inline without definition => local
1000                  * inline with definition    => external_visible */
1001                 storage_class_tag_t const storage_class
1002                         = (storage_class_tag_t) entity->declaration.storage_class;
1003                 bool                const is_inline     = entity->function.is_inline;
1004
1005                 if (is_inline && storage_class == STORAGE_CLASS_NONE && has_body) {
1006                     set_entity_visibility(irentity, ir_visibility_default);
1007                 } else if (storage_class == STORAGE_CLASS_STATIC ||
1008                            (is_inline && has_body)) {
1009                     set_entity_visibility(irentity, ir_visibility_local);
1010                 } else if (has_body) {
1011                     set_entity_visibility(irentity, ir_visibility_default);
1012                 } else {
1013                     set_entity_visibility(irentity, ir_visibility_external);
1014                 }
1015         } else {
1016                 /* nested functions are always local */
1017                 set_entity_visibility(irentity, ir_visibility_local);
1018         }
1019
1020         /* We should check for file scope here, but as long as we compile C only
1021            this is not needed. */
1022         if (!freestanding && !has_body) {
1023                 /* check for a known runtime function */
1024                 for (size_t i = 0; i < lengthof(rts_data); ++i) {
1025                         if (id != rts_idents[i])
1026                                 continue;
1027
1028                         function_type_t *function_type
1029                                 = &entity->declaration.type->function;
1030                         /* rts_entities code can't handle a "wrong" number of parameters */
1031                         if (function_type->unspecified_parameters)
1032                                 continue;
1033
1034                         /* check number of parameters */
1035                         int n_params = count_parameters(function_type);
1036                         if (n_params != rts_data[i].n_params)
1037                                 continue;
1038
1039                         type_t *return_type = skip_typeref(function_type->return_type);
1040                         int     n_res       = return_type != type_void ? 1 : 0;
1041                         if (n_res != rts_data[i].n_res)
1042                                 continue;
1043
1044                         /* ignore those rts functions not necessary needed for current mode */
1045                         if ((c_mode & rts_data[i].flags) == 0)
1046                                 continue;
1047                         assert(rts_entities[rts_data[i].id] == NULL);
1048                         rts_entities[rts_data[i].id] = irentity;
1049                 }
1050         }
1051
1052         entitymap_insert(&entitymap, symbol, irentity);
1053
1054 entity_created:
1055         entity->declaration.kind  = DECLARATION_KIND_FUNCTION;
1056         entity->function.irentity = irentity;
1057
1058         return irentity;
1059 }
1060
1061 /**
1062  * Creates a SymConst for a given entity.
1063  *
1064  * @param dbgi    debug info
1065  * @param entity  the entity
1066  */
1067 static ir_node *create_symconst(dbg_info *dbgi, ir_entity *entity)
1068 {
1069         assert(entity != NULL);
1070         union symconst_symbol sym;
1071         sym.entity_p = entity;
1072         return new_d_SymConst(dbgi, mode_P, sym, symconst_addr_ent);
1073 }
1074
1075 static ir_node *create_conv_from_b(dbg_info *dbgi, ir_node *value,
1076                                    ir_mode *dest_mode)
1077 {
1078         if (is_Const(value)) {
1079                 if (is_Const_null(value)) {
1080                         return new_Const(get_mode_null(dest_mode));
1081                 } else {
1082                         return new_Const(get_mode_one(dest_mode));
1083                 }
1084         }
1085
1086         ir_node *cond       = new_d_Cond(dbgi, value);
1087         ir_node *proj_true  = new_Proj(cond, mode_X, pn_Cond_true);
1088         ir_node *proj_false = new_Proj(cond, mode_X, pn_Cond_false);
1089         ir_node *tblock     = new_Block(1, &proj_true);
1090         ir_node *fblock     = new_Block(1, &proj_false);
1091         set_cur_block(tblock);
1092         ir_node *const1 = new_Const(get_mode_one(dest_mode));
1093         ir_node *tjump  = new_Jmp();
1094         set_cur_block(fblock);
1095         ir_node *const0 = new_Const(get_mode_null(dest_mode));
1096         ir_node *fjump  = new_Jmp();
1097
1098         ir_node *in[2]      = { tjump, fjump };
1099         ir_node *mergeblock = new_Block(2, in);
1100         set_cur_block(mergeblock);
1101         ir_node *phi_in[2]  = { const1, const0 };
1102         ir_node *phi        = new_Phi(2, phi_in, dest_mode);
1103         return phi;
1104 }
1105
1106 static ir_node *create_conv(dbg_info *dbgi, ir_node *value, ir_mode *dest_mode)
1107 {
1108         ir_mode *value_mode = get_irn_mode(value);
1109
1110         if (value_mode == dest_mode)
1111                 return value;
1112
1113         if (dest_mode == mode_b) {
1114                 ir_node *zero = new_Const(get_mode_null(value_mode));
1115                 ir_node *cmp  = new_d_Cmp(dbgi, value, zero, ir_relation_unordered_less_greater);
1116                 return cmp;
1117         } else if (value_mode == mode_b) {
1118                 return create_conv_from_b(dbgi, value, dest_mode);
1119         }
1120
1121         return new_d_Conv(dbgi, value, dest_mode);
1122 }
1123
1124 static ir_node *create_Const_from_bool(ir_mode *const mode, bool const v)
1125 {
1126         return new_Const((v ? get_mode_one : get_mode_null)(mode));
1127 }
1128
1129 /**
1130  * Creates a SymConst node representing a wide string literal.
1131  *
1132  * @param literal   the wide string literal
1133  */
1134 static ir_node *wide_string_literal_to_firm(
1135                 const string_literal_expression_t *literal)
1136 {
1137         ir_type  *const global_type = get_glob_type();
1138         ir_type  *const elem_type   = ir_type_wchar_t;
1139         dbg_info *const dbgi        = get_dbg_info(&literal->base.source_position);
1140         ir_type  *const type        = new_type_array(1, elem_type);
1141
1142         ident     *const id     = id_unique("str.%u");
1143         ir_entity *const entity = new_d_entity(global_type, id, type, dbgi);
1144         set_entity_ld_ident(entity, id);
1145         set_entity_visibility(entity, ir_visibility_private);
1146         add_entity_linkage(entity, IR_LINKAGE_CONSTANT);
1147
1148         ir_mode      *const mode = get_type_mode(elem_type);
1149         const size_t        slen = wstrlen(&literal->value);
1150
1151         set_array_lower_bound_int(type, 0, 0);
1152         set_array_upper_bound_int(type, 0, slen);
1153         set_type_size_bytes(type, slen * get_mode_size_bytes(mode));
1154         set_type_state(type, layout_fixed);
1155
1156         ir_initializer_t *initializer = create_initializer_compound(slen);
1157         const char              *p    = literal->value.begin;
1158         for (size_t i = 0; i < slen; ++i) {
1159                 assert(p < literal->value.begin + literal->value.size);
1160                 utf32             v   = read_utf8_char(&p);
1161                 ir_tarval        *tv  = new_tarval_from_long(v, mode);
1162                 ir_initializer_t *val = create_initializer_tarval(tv);
1163                 set_initializer_compound_value(initializer, i, val);
1164         }
1165         set_entity_initializer(entity, initializer);
1166
1167         return create_symconst(dbgi, entity);
1168 }
1169
1170 /**
1171  * Creates a SymConst node representing a string constant.
1172  *
1173  * @param src_pos    the source position of the string constant
1174  * @param id_prefix  a prefix for the name of the generated string constant
1175  * @param value      the value of the string constant
1176  */
1177 static ir_node *string_to_firm(const source_position_t *const src_pos,
1178                                const char *const id_prefix,
1179                                const string_t *const value)
1180 {
1181         ir_type  *const global_type = get_glob_type();
1182         dbg_info *const dbgi        = get_dbg_info(src_pos);
1183         ir_type  *const type        = new_type_array(1, ir_type_const_char);
1184
1185         ident     *const id     = id_unique(id_prefix);
1186         ir_entity *const entity = new_d_entity(global_type, id, type, dbgi);
1187         set_entity_ld_ident(entity, id);
1188         set_entity_visibility(entity, ir_visibility_private);
1189         add_entity_linkage(entity, IR_LINKAGE_CONSTANT);
1190
1191         ir_type *const elem_type = ir_type_const_char;
1192         ir_mode *const mode      = get_type_mode(elem_type);
1193
1194         const char* const string = value->begin;
1195         const size_t      slen   = value->size;
1196
1197         set_array_lower_bound_int(type, 0, 0);
1198         set_array_upper_bound_int(type, 0, slen);
1199         set_type_size_bytes(type, slen);
1200         set_type_state(type, layout_fixed);
1201
1202         ir_initializer_t *initializer = create_initializer_compound(slen);
1203         for (size_t i = 0; i < slen; ++i) {
1204                 ir_tarval        *tv  = new_tarval_from_long(string[i], mode);
1205                 ir_initializer_t *val = create_initializer_tarval(tv);
1206                 set_initializer_compound_value(initializer, i, val);
1207         }
1208         set_entity_initializer(entity, initializer);
1209
1210         return create_symconst(dbgi, entity);
1211 }
1212
1213 static bool try_create_integer(literal_expression_t *literal,
1214                                type_t *type, unsigned char base)
1215 {
1216         const char *string = literal->value.begin;
1217         size_t      size   = literal->value.size;
1218
1219         assert(type->kind == TYPE_ATOMIC);
1220         atomic_type_kind_t akind = type->atomic.akind;
1221
1222         ir_mode   *mode = atomic_modes[akind];
1223         ir_tarval *tv   = new_integer_tarval_from_str(string, size, 1, base, mode);
1224         if (tv == tarval_bad)
1225                 return false;
1226
1227         literal->base.type    = type;
1228         literal->target_value = tv;
1229         return true;
1230 }
1231
1232 static void create_integer_tarval(literal_expression_t *literal)
1233 {
1234         unsigned        us     = 0;
1235         unsigned        ls     = 0;
1236         const string_t *suffix = &literal->suffix;
1237         /* parse suffix */
1238         if (suffix->size > 0) {
1239                 for (const char *c = suffix->begin; *c != '\0'; ++c) {
1240                         if (*c == 'u' || *c == 'U') { ++us; }
1241                         if (*c == 'l' || *c == 'L') { ++ls; }
1242                 }
1243         }
1244
1245         unsigned base;
1246         switch (literal->base.kind) {
1247                 case EXPR_LITERAL_INTEGER_OCTAL:       base =  8; break;
1248                 case EXPR_LITERAL_INTEGER:             base = 10; break;
1249                 case EXPR_LITERAL_INTEGER_HEXADECIMAL: base = 16; break;
1250                 default: panic("invalid literal kind");
1251         }
1252
1253         tarval_int_overflow_mode_t old_mode = tarval_get_integer_overflow_mode();
1254
1255         /* now try if the constant is small enough for some types */
1256         tarval_set_integer_overflow_mode(TV_OVERFLOW_BAD);
1257         if (ls < 1) {
1258                 if (us == 0 && try_create_integer(literal, type_int, base))
1259                         goto finished;
1260                 if ((us == 1 || base != 10)
1261                                 && try_create_integer(literal, type_unsigned_int, base))
1262                         goto finished;
1263         }
1264         if (ls < 2) {
1265                 if (us == 0 && try_create_integer(literal, type_long, base))
1266                         goto finished;
1267                 if ((us == 1 || base != 10)
1268                                 && try_create_integer(literal, type_unsigned_long, base))
1269                         goto finished;
1270         }
1271         /* last try? then we should not report tarval_bad */
1272         if (us != 1 && base == 10)
1273                 tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
1274         if (us == 0 && try_create_integer(literal, type_long_long, base))
1275                 goto finished;
1276
1277         /* last try */
1278         assert(us == 1 || base != 10);
1279         tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
1280         bool res = try_create_integer(literal, type_unsigned_long_long, base);
1281         if (!res)
1282                 panic("internal error when parsing number literal");
1283
1284 finished:
1285         tarval_set_integer_overflow_mode(old_mode);
1286 }
1287
1288 void determine_literal_type(literal_expression_t *literal)
1289 {
1290         switch (literal->base.kind) {
1291         case EXPR_LITERAL_INTEGER:
1292         case EXPR_LITERAL_INTEGER_OCTAL:
1293         case EXPR_LITERAL_INTEGER_HEXADECIMAL:
1294                 create_integer_tarval(literal);
1295                 return;
1296         default:
1297                 break;
1298         }
1299 }
1300
1301 /**
1302  * Creates a Const node representing a constant.
1303  */
1304 static ir_node *literal_to_firm(const literal_expression_t *literal)
1305 {
1306         type_t     *type   = skip_typeref(literal->base.type);
1307         ir_mode    *mode   = get_ir_mode_storage(type);
1308         const char *string = literal->value.begin;
1309         size_t      size   = literal->value.size;
1310         ir_tarval  *tv;
1311
1312         switch (literal->base.kind) {
1313         case EXPR_LITERAL_WIDE_CHARACTER: {
1314                 utf32  v = read_utf8_char(&string);
1315                 char   buf[128];
1316                 size_t len = snprintf(buf, sizeof(buf), UTF32_PRINTF_FORMAT, v);
1317
1318                 tv = new_tarval_from_str(buf, len, mode);
1319                 goto make_const;
1320         }
1321         case EXPR_LITERAL_CHARACTER: {
1322                 long long int v;
1323                 bool char_is_signed
1324                         = get_atomic_type_flags(ATOMIC_TYPE_CHAR) & ATOMIC_TYPE_FLAG_SIGNED;
1325                 if (size == 1 && char_is_signed) {
1326                         v = (signed char)string[0];
1327                 } else {
1328                         v = 0;
1329                         for (size_t i = 0; i < size; ++i) {
1330                                 v = (v << 8) | ((unsigned char)string[i]);
1331                         }
1332                 }
1333                 char   buf[128];
1334                 size_t len = snprintf(buf, sizeof(buf), "%lld", v);
1335
1336                 tv = new_tarval_from_str(buf, len, mode);
1337                 goto make_const;
1338         }
1339         case EXPR_LITERAL_INTEGER:
1340         case EXPR_LITERAL_INTEGER_OCTAL:
1341         case EXPR_LITERAL_INTEGER_HEXADECIMAL:
1342                 assert(literal->target_value != NULL);
1343                 tv = literal->target_value;
1344                 goto make_const;
1345         case EXPR_LITERAL_FLOATINGPOINT:
1346                 tv = new_tarval_from_str(string, size, mode);
1347                 goto make_const;
1348         case EXPR_LITERAL_FLOATINGPOINT_HEXADECIMAL: {
1349                 char buffer[size + 2];
1350                 memcpy(buffer, "0x", 2);
1351                 memcpy(buffer+2, string, size);
1352                 tv = new_tarval_from_str(buffer, size+2, mode);
1353                 goto make_const;
1354         }
1355         case EXPR_LITERAL_BOOLEAN:
1356                 if (string[0] == 't') {
1357                         tv = get_mode_one(mode);
1358                 } else {
1359                         assert(string[0] == 'f');
1360                         tv = get_mode_null(mode);
1361                 }
1362                 goto make_const;
1363         case EXPR_LITERAL_MS_NOOP:
1364                 tv = get_mode_null(mode);
1365                 goto make_const;
1366         default:
1367                 break;
1368         }
1369         panic("Invalid literal kind found");
1370
1371 make_const: ;
1372         dbg_info *dbgi       = get_dbg_info(&literal->base.source_position);
1373         ir_node  *res        = new_d_Const(dbgi, tv);
1374         ir_mode  *mode_arith = get_ir_mode_arithmetic(type);
1375         return create_conv(dbgi, res, mode_arith);
1376 }
1377
1378 /*
1379  * Allocate an area of size bytes aligned at alignment
1380  * at a frame type.
1381  */
1382 static ir_entity *alloc_trampoline(ir_type *frame_type, int size, unsigned alignment)
1383 {
1384         static unsigned area_cnt = 0;
1385         char buf[32];
1386
1387         ir_type *tp = new_type_array(1, ir_type_char);
1388         set_array_bounds_int(tp, 0, 0, size);
1389         set_type_alignment_bytes(tp, alignment);
1390
1391         snprintf(buf, sizeof(buf), "trampolin%u", area_cnt++);
1392         ident *name = new_id_from_str(buf);
1393         ir_entity *area = new_entity(frame_type, name, tp);
1394
1395         /* mark this entity as compiler generated */
1396         set_entity_compiler_generated(area, 1);
1397         return area;
1398 }
1399
1400 /**
1401  * Return a node representing a trampoline region
1402  * for a given function entity.
1403  *
1404  * @param dbgi    debug info
1405  * @param entity  the function entity
1406  */
1407 static ir_node *get_trampoline_region(dbg_info *dbgi, ir_entity *entity)
1408 {
1409         ir_entity *region = NULL;
1410         int        i;
1411
1412         if (current_trampolines != NULL) {
1413                 for (i = ARR_LEN(current_trampolines) - 1; i >= 0; --i) {
1414                         if (current_trampolines[i].function == entity) {
1415                                 region = current_trampolines[i].region;
1416                                 break;
1417                         }
1418                 }
1419         } else {
1420                 current_trampolines = NEW_ARR_F(trampoline_region, 0);
1421         }
1422         ir_graph *irg = current_ir_graph;
1423         if (region == NULL) {
1424                 /* create a new region */
1425                 ir_type           *frame_tp = get_irg_frame_type(irg);
1426                 trampoline_region  reg;
1427                 reg.function = entity;
1428
1429                 reg.region   = alloc_trampoline(frame_tp,
1430                                                 be_params->trampoline_size,
1431                                                 be_params->trampoline_align);
1432                 ARR_APP1(trampoline_region, current_trampolines, reg);
1433                 region = reg.region;
1434         }
1435         return new_d_simpleSel(dbgi, get_irg_no_mem(irg), get_irg_frame(irg),
1436                                region);
1437 }
1438
1439 /**
1440  * Creates a trampoline for a function represented by an entity.
1441  *
1442  * @param dbgi    debug info
1443  * @param mode    the (reference) mode for the function address
1444  * @param entity  the function entity
1445  */
1446 static ir_node *create_trampoline(dbg_info *dbgi, ir_mode *mode,
1447                                   ir_entity *entity)
1448 {
1449         assert(entity != NULL);
1450         ir_node *in[3];
1451         in[0] = get_trampoline_region(dbgi, entity);
1452         in[1] = create_symconst(dbgi, entity);
1453         in[2] = get_irg_frame(current_ir_graph);
1454
1455         ir_node *irn = new_d_Builtin(dbgi, get_store(), 3, in, ir_bk_inner_trampoline, get_unknown_type());
1456         set_store(new_Proj(irn, mode_M, pn_Builtin_M));
1457         return new_Proj(irn, mode, pn_Builtin_max+1);
1458 }
1459
1460 /**
1461  * Dereference an address.
1462  *
1463  * @param dbgi  debug info
1464  * @param type  the type of the dereferenced result (the points_to type)
1465  * @param addr  the address to dereference
1466  */
1467 static ir_node *deref_address(dbg_info *const dbgi, type_t *const type,
1468                                       ir_node *const addr)
1469 {
1470         type_t *skipped = skip_typeref(type);
1471         if (is_type_incomplete(skipped))
1472                 return addr;
1473
1474         ir_type *irtype = get_ir_type(skipped);
1475         if (is_compound_type(irtype)
1476             || is_Method_type(irtype)
1477             || is_Array_type(irtype)) {
1478                 return addr;
1479         }
1480
1481         ir_cons_flags  flags    = skipped->base.qualifiers & TYPE_QUALIFIER_VOLATILE
1482                                   ? cons_volatile : cons_none;
1483         ir_mode *const mode     = get_type_mode(irtype);
1484         ir_node *const memory   = get_store();
1485         ir_node *const load     = new_d_Load(dbgi, memory, addr, mode, flags);
1486         ir_node *const load_mem = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1487         ir_node *const load_res = new_d_Proj(dbgi, load, mode,   pn_Load_res);
1488
1489         set_store(load_mem);
1490
1491         ir_mode *const mode_arithmetic = get_ir_mode_arithmetic(skipped);
1492         return create_conv(dbgi, load_res, mode_arithmetic);
1493 }
1494
1495 /**
1496  * Creates a strict Conv (to the node's mode) if necessary.
1497  *
1498  * @param dbgi  debug info
1499  * @param node  the node to strict conv
1500  */
1501 static ir_node *do_strict_conv(dbg_info *dbgi, ir_node *node)
1502 {
1503         ir_mode *mode = get_irn_mode(node);
1504
1505         if (!(get_irg_fp_model(current_ir_graph) & fp_explicit_rounding))
1506                 return node;
1507         if (!mode_is_float(mode))
1508                 return node;
1509
1510         /* check if there is already a Conv */
1511         if (is_Conv(node)) {
1512                 /* convert it into a strict Conv */
1513                 set_Conv_strict(node, 1);
1514                 return node;
1515         }
1516
1517         /* otherwise create a new one */
1518         return new_d_strictConv(dbgi, node, mode);
1519 }
1520
1521 /**
1522  * Returns the correct base address depending on whether it is a parameter or a
1523  * normal local variable.
1524  */
1525 static ir_node *get_local_frame(ir_entity *const ent)
1526 {
1527         ir_graph      *const irg   = current_ir_graph;
1528         const ir_type *const owner = get_entity_owner(ent);
1529         if (owner == current_outer_frame) {
1530                 assert(current_static_link != NULL);
1531                 return current_static_link;
1532         } else {
1533                 return get_irg_frame(irg);
1534         }
1535 }
1536
1537 /**
1538  * Keep all memory edges of the given block.
1539  */
1540 static void keep_all_memory(ir_node *block)
1541 {
1542         ir_node *old = get_cur_block();
1543
1544         set_cur_block(block);
1545         keep_alive(get_store());
1546         /* TODO: keep all memory edges from restricted pointers */
1547         set_cur_block(old);
1548 }
1549
1550 static ir_node *reference_expression_enum_value_to_firm(
1551                 const reference_expression_t *ref)
1552 {
1553         entity_t *entity = ref->entity;
1554         if (entity->enum_value.tv == NULL) {
1555                 type_t *type = skip_typeref(entity->enum_value.enum_type);
1556                 assert(type->kind == TYPE_ENUM);
1557                 determine_enum_values(&type->enumt);
1558         }
1559
1560         return new_Const(entity->enum_value.tv);
1561 }
1562
1563 static ir_node *reference_expression_to_firm(const reference_expression_t *ref)
1564 {
1565         dbg_info *dbgi   = get_dbg_info(&ref->base.source_position);
1566         entity_t *entity = ref->entity;
1567         assert(is_declaration(entity));
1568         type_t   *type   = skip_typeref(entity->declaration.type);
1569
1570         /* make sure the type is constructed */
1571         (void) get_ir_type(type);
1572
1573         if (entity->kind == ENTITY_FUNCTION
1574             && entity->function.btk != BUILTIN_NONE) {
1575                 ir_entity *irentity = get_function_entity(entity, NULL);
1576                 /* for gcc compatibility we have to produce (dummy) addresses for some
1577                  * builtins which don't have entities */
1578                 if (irentity == NULL) {
1579                         source_position_t const *const pos = &ref->base.source_position;
1580                         symbol_t          const *const sym = ref->entity->base.symbol;
1581                         warningf(WARN_OTHER, pos, "taking address of builtin '%Y'", sym);
1582
1583                         /* simply create a NULL pointer */
1584                         ir_mode  *mode = get_ir_mode_arithmetic(type_void_ptr);
1585                         ir_node  *res  = new_Const(get_mode_null(mode));
1586
1587                         return res;
1588                 }
1589         }
1590
1591         switch ((declaration_kind_t) entity->declaration.kind) {
1592         case DECLARATION_KIND_UNKNOWN:
1593                 break;
1594
1595         case DECLARATION_KIND_LOCAL_VARIABLE: {
1596                 ir_mode *const mode  = get_ir_mode_storage(type);
1597                 ir_node *const value = get_value(entity->variable.v.value_number, mode);
1598                 return create_conv(NULL, value, get_ir_mode_arithmetic(type));
1599         }
1600         case DECLARATION_KIND_PARAMETER: {
1601                 ir_mode *const mode  = get_ir_mode_storage(type);
1602                 ir_node *const value = get_value(entity->parameter.v.value_number,mode);
1603                 return create_conv(NULL, value, get_ir_mode_arithmetic(type));
1604         }
1605         case DECLARATION_KIND_FUNCTION: {
1606                 return create_symconst(dbgi, entity->function.irentity);
1607         }
1608         case DECLARATION_KIND_INNER_FUNCTION: {
1609                 ir_mode *const mode = get_ir_mode_storage(type);
1610                 if (!entity->function.goto_to_outer && !entity->function.need_closure) {
1611                         /* inner function not using the closure */
1612                         return create_symconst(dbgi, entity->function.irentity);
1613                 } else {
1614                         /* need trampoline here */
1615                         return create_trampoline(dbgi, mode, entity->function.irentity);
1616                 }
1617         }
1618         case DECLARATION_KIND_GLOBAL_VARIABLE: {
1619                 const variable_t *variable = &entity->variable;
1620                 ir_node *const addr = create_symconst(dbgi, variable->v.entity);
1621                 return deref_address(dbgi, variable->base.type, addr);
1622         }
1623
1624         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY: {
1625                 ir_entity *irentity = entity->variable.v.entity;
1626                 ir_node   *frame    = get_local_frame(irentity);
1627                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1628                 return deref_address(dbgi, entity->declaration.type, sel);
1629         }
1630         case DECLARATION_KIND_PARAMETER_ENTITY: {
1631                 ir_entity *irentity = entity->parameter.v.entity;
1632                 ir_node   *frame    = get_local_frame(irentity);
1633                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1634                 return deref_address(dbgi, entity->declaration.type, sel);
1635         }
1636
1637         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
1638                 return entity->variable.v.vla_base;
1639
1640         case DECLARATION_KIND_COMPOUND_MEMBER:
1641                 panic("not implemented reference type");
1642         }
1643
1644         panic("reference to declaration with unknown type found");
1645 }
1646
1647 static ir_node *reference_addr(const reference_expression_t *ref)
1648 {
1649         dbg_info *dbgi   = get_dbg_info(&ref->base.source_position);
1650         entity_t *entity = ref->entity;
1651         assert(is_declaration(entity));
1652
1653         switch((declaration_kind_t) entity->declaration.kind) {
1654         case DECLARATION_KIND_UNKNOWN:
1655                 break;
1656         case DECLARATION_KIND_PARAMETER:
1657         case DECLARATION_KIND_LOCAL_VARIABLE:
1658                 /* you can store to a local variable (so we don't panic but return NULL
1659                  * as an indicator for no real address) */
1660                 return NULL;
1661         case DECLARATION_KIND_GLOBAL_VARIABLE: {
1662                 ir_node *const addr = create_symconst(dbgi, entity->variable.v.entity);
1663                 return addr;
1664         }
1665         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY: {
1666                 ir_entity *irentity = entity->variable.v.entity;
1667                 ir_node   *frame    = get_local_frame(irentity);
1668                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1669
1670                 return sel;
1671         }
1672         case DECLARATION_KIND_PARAMETER_ENTITY: {
1673                 ir_entity *irentity = entity->parameter.v.entity;
1674                 ir_node   *frame    = get_local_frame(irentity);
1675                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1676
1677                 return sel;
1678         }
1679
1680         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
1681                 return entity->variable.v.vla_base;
1682
1683         case DECLARATION_KIND_FUNCTION: {
1684                 return create_symconst(dbgi, entity->function.irentity);
1685         }
1686
1687         case DECLARATION_KIND_INNER_FUNCTION: {
1688                 type_t  *const type = skip_typeref(entity->declaration.type);
1689                 ir_mode *const mode = get_ir_mode_storage(type);
1690                 if (!entity->function.goto_to_outer && !entity->function.need_closure) {
1691                         /* inner function not using the closure */
1692                         return create_symconst(dbgi, entity->function.irentity);
1693                 } else {
1694                         /* need trampoline here */
1695                         return create_trampoline(dbgi, mode, entity->function.irentity);
1696                 }
1697         }
1698
1699         case DECLARATION_KIND_COMPOUND_MEMBER:
1700                 panic("not implemented reference type");
1701         }
1702
1703         panic("reference to declaration with unknown type found");
1704 }
1705
1706 /**
1707  * Transform calls to builtin functions.
1708  */
1709 static ir_node *process_builtin_call(const call_expression_t *call)
1710 {
1711         dbg_info *dbgi = get_dbg_info(&call->base.source_position);
1712
1713         assert(call->function->kind == EXPR_REFERENCE);
1714         reference_expression_t *builtin = &call->function->reference;
1715
1716         type_t *expr_type = skip_typeref(builtin->base.type);
1717         assert(is_type_pointer(expr_type));
1718
1719         type_t *function_type = skip_typeref(expr_type->pointer.points_to);
1720
1721         switch (builtin->entity->function.btk) {
1722         case BUILTIN_NONE:
1723                 break;
1724         case BUILTIN_ALLOCA: {
1725                 expression_t *argument = call->arguments->expression;
1726                 ir_node      *size     = expression_to_firm(argument);
1727
1728                 ir_node *store  = get_store();
1729                 ir_node *alloca = new_d_Alloc(dbgi, store, size, get_unknown_type(),
1730                                               stack_alloc);
1731                 ir_node *proj_m = new_Proj(alloca, mode_M, pn_Alloc_M);
1732                 set_store(proj_m);
1733                 ir_node *res    = new_Proj(alloca, mode_P_data, pn_Alloc_res);
1734
1735                 return res;
1736         }
1737         case BUILTIN_INF: {
1738                 type_t    *type = function_type->function.return_type;
1739                 ir_mode   *mode = get_ir_mode_arithmetic(type);
1740                 ir_tarval *tv   = get_mode_infinite(mode);
1741                 ir_node   *res  = new_d_Const(dbgi, tv);
1742                 return res;
1743         }
1744         case BUILTIN_NAN: {
1745                 /* Ignore string for now... */
1746                 assert(is_type_function(function_type));
1747                 type_t    *type = function_type->function.return_type;
1748                 ir_mode   *mode = get_ir_mode_arithmetic(type);
1749                 ir_tarval *tv   = get_mode_NAN(mode);
1750                 ir_node   *res  = new_d_Const(dbgi, tv);
1751                 return res;
1752         }
1753         case BUILTIN_EXPECT: {
1754                 expression_t *argument = call->arguments->expression;
1755                 return _expression_to_firm(argument);
1756         }
1757         case BUILTIN_VA_END:
1758                 /* evaluate the argument of va_end for its side effects */
1759                 _expression_to_firm(call->arguments->expression);
1760                 return NULL;
1761         case BUILTIN_OBJECT_SIZE: {
1762                 /* determine value of "type" */
1763                 expression_t *type_expression = call->arguments->next->expression;
1764                 long          type_val        = fold_constant_to_int(type_expression);
1765                 type_t       *type            = function_type->function.return_type;
1766                 ir_mode      *mode            = get_ir_mode_arithmetic(type);
1767                 /* just produce a "I don't know" result */
1768                 ir_tarval    *result          = type_val & 2 ? get_mode_null(mode) :
1769                                                 get_mode_minus_one(mode);
1770
1771                 return new_d_Const(dbgi, result);
1772         }
1773         case BUILTIN_ROTL: {
1774                 ir_node *val  = expression_to_firm(call->arguments->expression);
1775                 ir_node *shf  = expression_to_firm(call->arguments->next->expression);
1776                 ir_mode *mode = get_irn_mode(val);
1777                 ir_mode *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1778                 return new_d_Rotl(dbgi, val, create_conv(dbgi, shf, mode_uint), mode);
1779         }
1780         case BUILTIN_ROTR: {
1781                 ir_node *val  = expression_to_firm(call->arguments->expression);
1782                 ir_node *shf  = expression_to_firm(call->arguments->next->expression);
1783                 ir_mode *mode = get_irn_mode(val);
1784                 ir_mode *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1785                 ir_node *c    = new_Const_long(mode_uint, get_mode_size_bits(mode));
1786                 ir_node *sub  = new_d_Sub(dbgi, c, create_conv(dbgi, shf, mode_uint), mode_uint);
1787                 return new_d_Rotl(dbgi, val, sub, mode);
1788         }
1789         case BUILTIN_FIRM:
1790                 break;
1791         case BUILTIN_LIBC:
1792         case BUILTIN_LIBC_CHECK:
1793                 panic("builtin did not produce an entity");
1794         }
1795         panic("invalid builtin found");
1796 }
1797
1798 /**
1799  * Transform a call expression.
1800  * Handles some special cases, like alloca() calls, which must be resolved
1801  * BEFORE the inlines runs. Inlining routines calling alloca() is dangerous,
1802  * 176.gcc for instance might allocate 2GB instead of 256 MB if alloca is not
1803  * handled right...
1804  */
1805 static ir_node *call_expression_to_firm(const call_expression_t *const call)
1806 {
1807         dbg_info *const dbgi = get_dbg_info(&call->base.source_position);
1808         assert(currently_reachable());
1809
1810         expression_t   *function = call->function;
1811         ir_node        *callee   = NULL;
1812         bool            firm_builtin = false;
1813         ir_builtin_kind firm_builtin_kind = ir_bk_trap;
1814         if (function->kind == EXPR_REFERENCE) {
1815                 const reference_expression_t *ref    = &function->reference;
1816                 entity_t                     *entity = ref->entity;
1817
1818                 if (entity->kind == ENTITY_FUNCTION) {
1819                         builtin_kind_t builtin = entity->function.btk;
1820                         if (builtin == BUILTIN_FIRM) {
1821                                 firm_builtin = true;
1822                                 firm_builtin_kind = entity->function.b.firm_builtin_kind;
1823                         } else if (builtin != BUILTIN_NONE && builtin != BUILTIN_LIBC
1824                                    && builtin != BUILTIN_LIBC_CHECK) {
1825                                 return process_builtin_call(call);
1826                         }
1827                 }
1828         }
1829         if (!firm_builtin)
1830                 callee = expression_to_firm(function);
1831
1832         type_t *type = skip_typeref(function->base.type);
1833         assert(is_type_pointer(type));
1834         pointer_type_t *pointer_type = &type->pointer;
1835         type_t         *points_to    = skip_typeref(pointer_type->points_to);
1836         assert(is_type_function(points_to));
1837         function_type_t *function_type = &points_to->function;
1838
1839         int      n_parameters    = 0;
1840         ir_type *ir_method_type  = get_ir_type((type_t*) function_type);
1841         ir_type *new_method_type = NULL;
1842         if (function_type->variadic || function_type->unspecified_parameters) {
1843                 const call_argument_t *argument = call->arguments;
1844                 for ( ; argument != NULL; argument = argument->next) {
1845                         ++n_parameters;
1846                 }
1847
1848                 /* we need to construct a new method type matching the call
1849                  * arguments... */
1850                 type_dbg_info *tdbgi = get_type_dbg_info_((const type_t*) function_type);
1851                 int n_res       = get_method_n_ress(ir_method_type);
1852                 new_method_type = new_d_type_method(n_parameters, n_res, tdbgi);
1853                 set_method_calling_convention(new_method_type,
1854                                get_method_calling_convention(ir_method_type));
1855                 set_method_additional_properties(new_method_type,
1856                                get_method_additional_properties(ir_method_type));
1857                 set_method_variadicity(new_method_type,
1858                                        get_method_variadicity(ir_method_type));
1859
1860                 for (int i = 0; i < n_res; ++i) {
1861                         set_method_res_type(new_method_type, i,
1862                                             get_method_res_type(ir_method_type, i));
1863                 }
1864                 argument = call->arguments;
1865                 for (int i = 0; i < n_parameters; ++i, argument = argument->next) {
1866                         expression_t *expression = argument->expression;
1867                         ir_type      *irtype     = get_ir_type(expression->base.type);
1868                         set_method_param_type(new_method_type, i, irtype);
1869                 }
1870                 ir_method_type = new_method_type;
1871         } else {
1872                 n_parameters = get_method_n_params(ir_method_type);
1873         }
1874
1875         ir_node *in[n_parameters];
1876
1877         const call_argument_t *argument = call->arguments;
1878         for (int n = 0; n < n_parameters; ++n) {
1879                 expression_t *expression = argument->expression;
1880                 ir_node      *arg_node   = expression_to_firm(expression);
1881
1882                 type_t *arg_type = skip_typeref(expression->base.type);
1883                 if (!is_type_compound(arg_type)) {
1884                         ir_mode *mode = get_ir_mode_storage(expression->base.type);
1885                         arg_node      = create_conv(dbgi, arg_node, mode);
1886                         arg_node      = do_strict_conv(dbgi, arg_node);
1887                 }
1888
1889                 in[n] = arg_node;
1890
1891                 argument = argument->next;
1892         }
1893
1894         ir_node *store;
1895         if (function_type->modifiers & DM_CONST) {
1896                 store = get_irg_no_mem(current_ir_graph);
1897         } else {
1898                 store = get_store();
1899         }
1900
1901         ir_node *node;
1902         type_t  *return_type = skip_typeref(function_type->return_type);
1903         ir_node *result      = NULL;
1904         if (firm_builtin) {
1905                 node = new_d_Builtin(dbgi, store, n_parameters, in, firm_builtin_kind,
1906                                      ir_method_type);
1907                 if (! (function_type->modifiers & DM_CONST)) {
1908                         ir_node *mem = new_Proj(node, mode_M, pn_Builtin_M);
1909                         set_store(mem);
1910                 }
1911
1912                 if (!is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
1913                         assert(is_type_scalar(return_type));
1914                         ir_mode *mode = get_ir_mode_storage(return_type);
1915                         result = new_Proj(node, mode, pn_Builtin_max+1);
1916                         ir_mode *mode_arith = get_ir_mode_arithmetic(return_type);
1917                         result              = create_conv(NULL, result, mode_arith);
1918                 }
1919         } else {
1920                 node = new_d_Call(dbgi, store, callee, n_parameters, in, ir_method_type);
1921                 if (! (function_type->modifiers & DM_CONST)) {
1922                         ir_node *mem = new_Proj(node, mode_M, pn_Call_M);
1923                         set_store(mem);
1924                 }
1925
1926                 if (!is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
1927                         ir_node *resproj = new_Proj(node, mode_T, pn_Call_T_result);
1928
1929                         if (is_type_scalar(return_type)) {
1930                                 ir_mode *mode       = get_ir_mode_storage(return_type);
1931                                 result              = new_Proj(resproj, mode, 0);
1932                                 ir_mode *mode_arith = get_ir_mode_arithmetic(return_type);
1933                                 result              = create_conv(NULL, result, mode_arith);
1934                         } else {
1935                                 ir_mode *mode = mode_P_data;
1936                                 result        = new_Proj(resproj, mode, 0);
1937                         }
1938                 }
1939         }
1940
1941         if (function_type->modifiers & DM_NORETURN) {
1942                 /* A dead end:  Keep the Call and the Block.  Also place all further
1943                  * nodes into a new and unreachable block. */
1944                 keep_alive(node);
1945                 keep_alive(get_cur_block());
1946                 ir_node *block = new_Block(0, NULL);
1947                 set_cur_block(block);
1948         }
1949
1950         return result;
1951 }
1952
1953 static void statement_to_firm(statement_t *statement);
1954 static ir_node *compound_statement_to_firm(compound_statement_t *compound);
1955
1956 static ir_node *expression_to_addr(const expression_t *expression);
1957 static ir_node *create_condition_evaluation(const expression_t *expression,
1958                                             ir_node *true_block,
1959                                             ir_node *false_block);
1960
1961 static void assign_value(dbg_info *dbgi, ir_node *addr, type_t *type,
1962                          ir_node *value)
1963 {
1964         if (!is_type_compound(type)) {
1965                 ir_mode *mode = get_ir_mode_storage(type);
1966                 value         = create_conv(dbgi, value, mode);
1967                 value         = do_strict_conv(dbgi, value);
1968         }
1969
1970         ir_node *memory = get_store();
1971
1972         if (is_type_scalar(type)) {
1973                 ir_cons_flags flags = type->base.qualifiers & TYPE_QUALIFIER_VOLATILE
1974                                       ? cons_volatile : cons_none;
1975                 ir_node  *store     = new_d_Store(dbgi, memory, addr, value, flags);
1976                 ir_node  *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
1977                 set_store(store_mem);
1978         } else {
1979                 ir_type *irtype    = get_ir_type(type);
1980                 ir_node *copyb     = new_d_CopyB(dbgi, memory, addr, value, irtype);
1981                 ir_node *copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
1982                 set_store(copyb_mem);
1983         }
1984 }
1985
1986 static ir_tarval *create_bitfield_mask(ir_mode *mode, int offset, int size)
1987 {
1988         ir_tarval *all_one   = get_mode_all_one(mode);
1989         int        mode_size = get_mode_size_bits(mode);
1990         ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1991
1992         assert(offset >= 0);
1993         assert(size   >= 0);
1994         assert(offset + size <= mode_size);
1995         if (size == mode_size) {
1996                 return all_one;
1997         }
1998
1999         long       shiftr    = get_mode_size_bits(mode) - size;
2000         long       shiftl    = offset;
2001         ir_tarval *tv_shiftr = new_tarval_from_long(shiftr, mode_uint);
2002         ir_tarval *tv_shiftl = new_tarval_from_long(shiftl, mode_uint);
2003         ir_tarval *mask0     = tarval_shr(all_one, tv_shiftr);
2004         ir_tarval *mask1     = tarval_shl(mask0, tv_shiftl);
2005
2006         return mask1;
2007 }
2008
2009 static ir_node *bitfield_store_to_firm(dbg_info *dbgi,
2010                 ir_entity *entity, ir_node *addr, ir_node *value, bool set_volatile,
2011                 bool need_return)
2012 {
2013         ir_type *entity_type = get_entity_type(entity);
2014         ir_type *base_type   = get_primitive_base_type(entity_type);
2015         ir_mode *mode        = get_type_mode(base_type);
2016         ir_mode *mode_uint   = atomic_modes[ATOMIC_TYPE_UINT];
2017
2018         value = create_conv(dbgi, value, mode);
2019
2020         /* kill upper bits of value and shift to right position */
2021         unsigned  bitoffset  = get_entity_offset_bits_remainder(entity);
2022         unsigned  bitsize    = get_mode_size_bits(get_type_mode(entity_type));
2023         unsigned  base_bits  = get_mode_size_bits(mode);
2024         unsigned  shiftwidth = base_bits - bitsize;
2025
2026         ir_node  *shiftcount = new_Const_long(mode_uint, shiftwidth);
2027         ir_node  *shiftl     = new_d_Shl(dbgi, value, shiftcount, mode);
2028
2029         unsigned  shrwidth   = base_bits - bitsize - bitoffset;
2030         ir_node  *shrconst   = new_Const_long(mode_uint, shrwidth);
2031         ir_node  *shiftr     = new_d_Shr(dbgi, shiftl, shrconst, mode);
2032
2033         /* load current value */
2034         ir_node   *mem             = get_store();
2035         ir_node   *load            = new_d_Load(dbgi, mem, addr, mode,
2036                                           set_volatile ? cons_volatile : cons_none);
2037         ir_node   *load_mem        = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
2038         ir_node   *load_res        = new_d_Proj(dbgi, load, mode, pn_Load_res);
2039         ir_tarval *shift_mask      = create_bitfield_mask(mode, bitoffset, bitsize);
2040         ir_tarval *inv_mask        = tarval_not(shift_mask);
2041         ir_node   *inv_mask_node   = new_d_Const(dbgi, inv_mask);
2042         ir_node   *load_res_masked = new_d_And(dbgi, load_res, inv_mask_node, mode);
2043
2044         /* construct new value and store */
2045         ir_node *new_val   = new_d_Or(dbgi, load_res_masked, shiftr, mode);
2046         ir_node *store     = new_d_Store(dbgi, load_mem, addr, new_val,
2047                                          set_volatile ? cons_volatile : cons_none);
2048         ir_node *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
2049         set_store(store_mem);
2050
2051         if (!need_return)
2052                 return NULL;
2053
2054         ir_node *res_shr;
2055         ir_node *count_res_shr = new_Const_long(mode_uint, base_bits - bitsize);
2056         if (mode_is_signed(mode)) {
2057                 res_shr = new_d_Shrs(dbgi, shiftl, count_res_shr, mode);
2058         } else {
2059                 res_shr = new_d_Shr(dbgi, shiftl, count_res_shr, mode);
2060         }
2061         return res_shr;
2062 }
2063
2064 static ir_node *bitfield_extract_to_firm(const select_expression_t *expression,
2065                                          ir_node *addr)
2066 {
2067         dbg_info *dbgi      = get_dbg_info(&expression->base.source_position);
2068         entity_t *entity    = expression->compound_entry;
2069         type_t   *base_type = entity->declaration.type;
2070         ir_mode  *mode      = get_ir_mode_storage(base_type);
2071         ir_node  *mem       = get_store();
2072         ir_node  *load      = new_d_Load(dbgi, mem, addr, mode, cons_none);
2073         ir_node  *load_mem  = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
2074         ir_node  *load_res  = new_d_Proj(dbgi, load, mode, pn_Load_res);
2075         ir_mode  *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
2076
2077         ir_mode  *amode     = mode;
2078         /* optimisation, since shifting in modes < machine_size is usually
2079          * less efficient */
2080         if (get_mode_size_bits(amode) < get_mode_size_bits(mode_uint)) {
2081                 amode = mode_uint;
2082         }
2083         unsigned amode_size = get_mode_size_bits(amode);
2084         load_res = create_conv(dbgi, load_res, amode);
2085
2086         set_store(load_mem);
2087
2088         /* kill upper bits */
2089         assert(expression->compound_entry->kind == ENTITY_COMPOUND_MEMBER);
2090         unsigned   bitoffset   = entity->compound_member.bit_offset;
2091         unsigned   bitsize     = entity->compound_member.bit_size;
2092         unsigned   shift_bitsl = amode_size - bitoffset - bitsize;
2093         ir_tarval *tvl         = new_tarval_from_long((long)shift_bitsl, mode_uint);
2094         ir_node   *countl      = new_d_Const(dbgi, tvl);
2095         ir_node   *shiftl      = new_d_Shl(dbgi, load_res, countl, amode);
2096
2097         unsigned   shift_bitsr = bitoffset + shift_bitsl;
2098         assert(shift_bitsr <= amode_size);
2099         ir_tarval *tvr         = new_tarval_from_long((long)shift_bitsr, mode_uint);
2100         ir_node   *countr      = new_d_Const(dbgi, tvr);
2101         ir_node   *shiftr;
2102         if (mode_is_signed(mode)) {
2103                 shiftr = new_d_Shrs(dbgi, shiftl, countr, amode);
2104         } else {
2105                 shiftr = new_d_Shr(dbgi, shiftl, countr, amode);
2106         }
2107
2108         type_t  *type    = expression->base.type;
2109         ir_mode *resmode = get_ir_mode_arithmetic(type);
2110         return create_conv(dbgi, shiftr, resmode);
2111 }
2112
2113 /* make sure the selected compound type is constructed */
2114 static void construct_select_compound(const select_expression_t *expression)
2115 {
2116         type_t *type = skip_typeref(expression->compound->base.type);
2117         if (is_type_pointer(type)) {
2118                 type = type->pointer.points_to;
2119         }
2120         (void) get_ir_type(type);
2121 }
2122
2123 static ir_node *set_value_for_expression_addr(const expression_t *expression,
2124                                               ir_node *value, ir_node *addr)
2125 {
2126         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2127         type_t   *type = skip_typeref(expression->base.type);
2128
2129         if (!is_type_compound(type)) {
2130                 ir_mode  *mode = get_ir_mode_storage(type);
2131                 value          = create_conv(dbgi, value, mode);
2132                 value          = do_strict_conv(dbgi, value);
2133         }
2134
2135         if (expression->kind == EXPR_REFERENCE) {
2136                 const reference_expression_t *ref = &expression->reference;
2137
2138                 entity_t *entity = ref->entity;
2139                 assert(is_declaration(entity));
2140                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2141                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE) {
2142                         set_value(entity->variable.v.value_number, value);
2143                         return value;
2144                 } else if (entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
2145                         set_value(entity->parameter.v.value_number, value);
2146                         return value;
2147                 }
2148         }
2149
2150         if (addr == NULL)
2151                 addr = expression_to_addr(expression);
2152         assert(addr != NULL);
2153
2154         if (expression->kind == EXPR_SELECT) {
2155                 const select_expression_t *select = &expression->select;
2156
2157                 construct_select_compound(select);
2158
2159                 entity_t *entity = select->compound_entry;
2160                 assert(entity->kind == ENTITY_COMPOUND_MEMBER);
2161                 if (entity->compound_member.bitfield) {
2162                         ir_entity *irentity = entity->compound_member.entity;
2163                         bool       set_volatile
2164                                 = select->base.type->base.qualifiers & TYPE_QUALIFIER_VOLATILE;
2165                         value = bitfield_store_to_firm(dbgi, irentity, addr, value,
2166                                                        set_volatile, true);
2167                         return value;
2168                 }
2169         }
2170
2171         assign_value(dbgi, addr, type, value);
2172         return value;
2173 }
2174
2175 static void set_value_for_expression(const expression_t *expression,
2176                                      ir_node *value)
2177 {
2178         set_value_for_expression_addr(expression, value, NULL);
2179 }
2180
2181 static ir_node *get_value_from_lvalue(const expression_t *expression,
2182                                       ir_node *addr)
2183 {
2184         if (expression->kind == EXPR_REFERENCE) {
2185                 const reference_expression_t *ref = &expression->reference;
2186
2187                 entity_t *entity = ref->entity;
2188                 assert(entity->kind == ENTITY_VARIABLE
2189                                 || entity->kind == ENTITY_PARAMETER);
2190                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2191                 int value_number;
2192                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE) {
2193                         value_number = entity->variable.v.value_number;
2194                         assert(addr == NULL);
2195                         type_t  *type = skip_typeref(expression->base.type);
2196                         ir_mode *mode = get_ir_mode_storage(type);
2197                         ir_node *res  = get_value(value_number, mode);
2198                         return create_conv(NULL, res, get_ir_mode_arithmetic(type));
2199                 } else if (entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
2200                         value_number = entity->parameter.v.value_number;
2201                         assert(addr == NULL);
2202                         type_t  *type = skip_typeref(expression->base.type);
2203                         ir_mode *mode = get_ir_mode_storage(type);
2204                         ir_node *res  = get_value(value_number, mode);
2205                         return create_conv(NULL, res, get_ir_mode_arithmetic(type));
2206                 }
2207         }
2208
2209         assert(addr != NULL);
2210         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2211
2212         ir_node *value;
2213         if (expression->kind == EXPR_SELECT &&
2214             expression->select.compound_entry->compound_member.bitfield) {
2215             construct_select_compound(&expression->select);
2216                 value = bitfield_extract_to_firm(&expression->select, addr);
2217         } else {
2218                 value = deref_address(dbgi, expression->base.type, addr);
2219         }
2220
2221         return value;
2222 }
2223
2224
2225 static ir_node *create_incdec(const unary_expression_t *expression)
2226 {
2227         dbg_info *const     dbgi = get_dbg_info(&expression->base.source_position);
2228         const expression_t *value_expr = expression->value;
2229         ir_node            *addr       = expression_to_addr(value_expr);
2230         ir_node            *value      = get_value_from_lvalue(value_expr, addr);
2231
2232         type_t  *type = skip_typeref(expression->base.type);
2233         ir_mode *mode = get_ir_mode_arithmetic(expression->base.type);
2234
2235         ir_node *offset;
2236         if (is_type_pointer(type)) {
2237                 pointer_type_t *pointer_type = &type->pointer;
2238                 offset = get_type_size_node(pointer_type->points_to);
2239         } else {
2240                 assert(is_type_arithmetic(type));
2241                 offset = new_Const(get_mode_one(mode));
2242         }
2243
2244         ir_node *result;
2245         ir_node *store_value;
2246         switch(expression->base.kind) {
2247         case EXPR_UNARY_POSTFIX_INCREMENT:
2248                 result      = value;
2249                 store_value = new_d_Add(dbgi, value, offset, mode);
2250                 break;
2251         case EXPR_UNARY_POSTFIX_DECREMENT:
2252                 result      = value;
2253                 store_value = new_d_Sub(dbgi, value, offset, mode);
2254                 break;
2255         case EXPR_UNARY_PREFIX_INCREMENT:
2256                 result      = new_d_Add(dbgi, value, offset, mode);
2257                 store_value = result;
2258                 break;
2259         case EXPR_UNARY_PREFIX_DECREMENT:
2260                 result      = new_d_Sub(dbgi, value, offset, mode);
2261                 store_value = result;
2262                 break;
2263         default:
2264                 panic("no incdec expr in create_incdec");
2265         }
2266
2267         set_value_for_expression_addr(value_expr, store_value, addr);
2268
2269         return result;
2270 }
2271
2272 static bool is_local_variable(expression_t *expression)
2273 {
2274         if (expression->kind != EXPR_REFERENCE)
2275                 return false;
2276         reference_expression_t *ref_expr = &expression->reference;
2277         entity_t               *entity   = ref_expr->entity;
2278         if (entity->kind != ENTITY_VARIABLE)
2279                 return false;
2280         assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2281         return entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE;
2282 }
2283
2284 static ir_relation get_relation(const expression_kind_t kind)
2285 {
2286         switch(kind) {
2287         case EXPR_BINARY_EQUAL:         return ir_relation_equal;
2288         case EXPR_BINARY_ISLESSGREATER: return ir_relation_less_greater;
2289         case EXPR_BINARY_NOTEQUAL:      return ir_relation_unordered_less_greater;
2290         case EXPR_BINARY_ISLESS:
2291         case EXPR_BINARY_LESS:          return ir_relation_less;
2292         case EXPR_BINARY_ISLESSEQUAL:
2293         case EXPR_BINARY_LESSEQUAL:     return ir_relation_less_equal;
2294         case EXPR_BINARY_ISGREATER:
2295         case EXPR_BINARY_GREATER:       return ir_relation_greater;
2296         case EXPR_BINARY_ISGREATEREQUAL:
2297         case EXPR_BINARY_GREATEREQUAL:  return ir_relation_greater_equal;
2298         case EXPR_BINARY_ISUNORDERED:   return ir_relation_unordered;
2299
2300         default:
2301                 break;
2302         }
2303         panic("trying to get pn_Cmp from non-comparison binexpr type");
2304 }
2305
2306 /**
2307  * Handle the assume optimizer hint: check if a Confirm
2308  * node can be created.
2309  *
2310  * @param dbi    debug info
2311  * @param expr   the IL assume expression
2312  *
2313  * we support here only some simple cases:
2314  *  - var rel const
2315  *  - const rel val
2316  *  - var rel var
2317  */
2318 static ir_node *handle_assume_compare(dbg_info *dbi,
2319                                       const binary_expression_t *expression)
2320 {
2321         expression_t *op1 = expression->left;
2322         expression_t *op2 = expression->right;
2323         entity_t     *var2, *var = NULL;
2324         ir_node      *res      = NULL;
2325         ir_relation   relation = get_relation(expression->base.kind);
2326
2327         if (is_local_variable(op1) && is_local_variable(op2)) {
2328                 var  = op1->reference.entity;
2329             var2 = op2->reference.entity;
2330
2331                 type_t  *const type = skip_typeref(var->declaration.type);
2332                 ir_mode *const mode = get_ir_mode_storage(type);
2333
2334                 ir_node *const irn1 = get_value(var->variable.v.value_number, mode);
2335                 ir_node *const irn2 = get_value(var2->variable.v.value_number, mode);
2336
2337                 res = new_d_Confirm(dbi, irn2, irn1, get_inversed_relation(relation));
2338                 set_value(var2->variable.v.value_number, res);
2339
2340                 res = new_d_Confirm(dbi, irn1, irn2, relation);
2341                 set_value(var->variable.v.value_number, res);
2342
2343                 return res;
2344         }
2345
2346         expression_t *con = NULL;
2347         if (is_local_variable(op1) && is_constant_expression(op2) == EXPR_CLASS_CONSTANT) {
2348                 var = op1->reference.entity;
2349                 con = op2;
2350         } else if (is_constant_expression(op1) == EXPR_CLASS_CONSTANT && is_local_variable(op2)) {
2351                 relation = get_inversed_relation(relation);
2352                 var = op2->reference.entity;
2353                 con = op1;
2354         }
2355
2356         if (var != NULL) {
2357                 type_t  *const type = skip_typeref(var->declaration.type);
2358                 ir_mode *const mode = get_ir_mode_storage(type);
2359
2360                 res = get_value(var->variable.v.value_number, mode);
2361                 res = new_d_Confirm(dbi, res, expression_to_firm(con), relation);
2362                 set_value(var->variable.v.value_number, res);
2363         }
2364         return res;
2365 }
2366
2367 /**
2368  * Handle the assume optimizer hint.
2369  *
2370  * @param dbi    debug info
2371  * @param expr   the IL assume expression
2372  */
2373 static ir_node *handle_assume(dbg_info *dbi, const expression_t *expression)
2374 {
2375         switch(expression->kind) {
2376         case EXPR_BINARY_EQUAL:
2377         case EXPR_BINARY_NOTEQUAL:
2378         case EXPR_BINARY_LESS:
2379         case EXPR_BINARY_LESSEQUAL:
2380         case EXPR_BINARY_GREATER:
2381         case EXPR_BINARY_GREATEREQUAL:
2382                 return handle_assume_compare(dbi, &expression->binary);
2383         default:
2384                 return NULL;
2385         }
2386 }
2387
2388 static ir_node *create_cast(dbg_info *dbgi, ir_node *value_node,
2389                             type_t *from_type, type_t *type)
2390 {
2391         type = skip_typeref(type);
2392         if (type == type_void) {
2393                 /* make sure firm type is constructed */
2394                 (void) get_ir_type(type);
2395                 return NULL;
2396         }
2397         if (!is_type_scalar(type)) {
2398                 /* make sure firm type is constructed */
2399                 (void) get_ir_type(type);
2400                 return value_node;
2401         }
2402
2403         from_type     = skip_typeref(from_type);
2404         ir_mode *mode = get_ir_mode_storage(type);
2405         /* check for conversion from / to __based types */
2406         if (is_type_pointer(type) && is_type_pointer(from_type)) {
2407                 const variable_t *from_var = from_type->pointer.base_variable;
2408                 const variable_t *to_var   = type->pointer.base_variable;
2409                 if (from_var != to_var) {
2410                         if (from_var != NULL) {
2411                                 ir_node *const addr = create_symconst(dbgi, from_var->v.entity);
2412                                 ir_node *const base = deref_address(dbgi, from_var->base.type, addr);
2413                                 value_node = new_d_Add(dbgi, value_node, base, get_ir_mode_storage(from_type));
2414                         }
2415                         if (to_var != NULL) {
2416                                 ir_node *const addr = create_symconst(dbgi, to_var->v.entity);
2417                                 ir_node *const base = deref_address(dbgi, to_var->base.type, addr);
2418                                 value_node = new_d_Sub(dbgi, value_node, base, mode);
2419                         }
2420                 }
2421         }
2422
2423         if (is_type_atomic(type, ATOMIC_TYPE_BOOL)) {
2424                 /* bool adjustments (we save a mode_Bu, but have to temporarily
2425                  * convert to mode_b so we only get a 0/1 value */
2426                 value_node = create_conv(dbgi, value_node, mode_b);
2427         }
2428
2429         ir_mode *mode_arith = get_ir_mode_arithmetic(type);
2430         ir_node *node       = create_conv(dbgi, value_node, mode);
2431         node                = do_strict_conv(dbgi, node);
2432         node                = create_conv(dbgi, node, mode_arith);
2433
2434         return node;
2435 }
2436
2437 static ir_node *unary_expression_to_firm(const unary_expression_t *expression)
2438 {
2439         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2440         type_t   *type = skip_typeref(expression->base.type);
2441
2442         if (expression->base.kind == EXPR_UNARY_TAKE_ADDRESS)
2443                 return expression_to_addr(expression->value);
2444
2445         const expression_t *value = expression->value;
2446
2447         switch(expression->base.kind) {
2448         case EXPR_UNARY_NEGATE: {
2449                 ir_node *value_node = expression_to_firm(value);
2450                 ir_mode *mode       = get_ir_mode_arithmetic(type);
2451                 return new_d_Minus(dbgi, value_node, mode);
2452         }
2453         case EXPR_UNARY_PLUS:
2454                 return expression_to_firm(value);
2455         case EXPR_UNARY_BITWISE_NEGATE: {
2456                 ir_node *value_node = expression_to_firm(value);
2457                 ir_mode *mode       = get_ir_mode_arithmetic(type);
2458                 return new_d_Not(dbgi, value_node, mode);
2459         }
2460         case EXPR_UNARY_NOT: {
2461                 ir_node *value_node = _expression_to_firm(value);
2462                 value_node          = create_conv(dbgi, value_node, mode_b);
2463                 ir_node *res        = new_d_Not(dbgi, value_node, mode_b);
2464                 return res;
2465         }
2466         case EXPR_UNARY_DEREFERENCE: {
2467                 ir_node *value_node = expression_to_firm(value);
2468                 type_t  *value_type = skip_typeref(value->base.type);
2469                 assert(is_type_pointer(value_type));
2470
2471                 /* check for __based */
2472                 const variable_t *const base_var = value_type->pointer.base_variable;
2473                 if (base_var != NULL) {
2474                         ir_node *const addr = create_symconst(dbgi, base_var->v.entity);
2475                         ir_node *const base = deref_address(dbgi, base_var->base.type, addr);
2476                         value_node = new_d_Add(dbgi, value_node, base, get_ir_mode_storage(value_type));
2477                 }
2478                 type_t  *points_to  = value_type->pointer.points_to;
2479                 return deref_address(dbgi, points_to, value_node);
2480         }
2481         case EXPR_UNARY_POSTFIX_INCREMENT:
2482         case EXPR_UNARY_POSTFIX_DECREMENT:
2483         case EXPR_UNARY_PREFIX_INCREMENT:
2484         case EXPR_UNARY_PREFIX_DECREMENT:
2485                 return create_incdec(expression);
2486         case EXPR_UNARY_CAST: {
2487                 ir_node *value_node = expression_to_firm(value);
2488                 type_t  *from_type  = value->base.type;
2489                 return create_cast(dbgi, value_node, from_type, type);
2490         }
2491         case EXPR_UNARY_ASSUME:
2492                 return handle_assume(dbgi, value);
2493
2494         default:
2495                 break;
2496         }
2497         panic("invalid UNEXPR type found");
2498 }
2499
2500 /**
2501  * produces a 0/1 depending of the value of a mode_b node
2502  */
2503 static ir_node *produce_condition_result(const expression_t *expression,
2504                                          ir_mode *mode, dbg_info *dbgi)
2505 {
2506         ir_node *const one_block  = new_immBlock();
2507         ir_node *const zero_block = new_immBlock();
2508         create_condition_evaluation(expression, one_block, zero_block);
2509         mature_immBlock(one_block);
2510         mature_immBlock(zero_block);
2511
2512         ir_node *const jmp_one  = new_rd_Jmp(dbgi, one_block);
2513         ir_node *const jmp_zero = new_rd_Jmp(dbgi, zero_block);
2514         ir_node *const in_cf[2] = { jmp_one, jmp_zero };
2515         ir_node *const block    = new_Block(lengthof(in_cf), in_cf);
2516         set_cur_block(block);
2517
2518         ir_node *const one   = new_Const(get_mode_one(mode));
2519         ir_node *const zero  = new_Const(get_mode_null(mode));
2520         ir_node *const in[2] = { one, zero };
2521         ir_node *const val   = new_d_Phi(dbgi, lengthof(in), in, mode);
2522
2523         return val;
2524 }
2525
2526 static ir_node *adjust_for_pointer_arithmetic(dbg_info *dbgi,
2527                 ir_node *value, type_t *type)
2528 {
2529         ir_mode        *const mode         = get_ir_mode_arithmetic(type_ptrdiff_t);
2530         assert(is_type_pointer(type));
2531         pointer_type_t *const pointer_type = &type->pointer;
2532         type_t         *const points_to    = skip_typeref(pointer_type->points_to);
2533         ir_node        *      elem_size    = get_type_size_node(points_to);
2534         elem_size                          = create_conv(dbgi, elem_size, mode);
2535         value                              = create_conv(dbgi, value,     mode);
2536         ir_node        *const mul          = new_d_Mul(dbgi, value, elem_size, mode);
2537         return mul;
2538 }
2539
2540 static ir_node *create_op(dbg_info *dbgi, const binary_expression_t *expression,
2541                           ir_node *left, ir_node *right)
2542 {
2543         ir_mode  *mode;
2544         type_t   *type_left  = skip_typeref(expression->left->base.type);
2545         type_t   *type_right = skip_typeref(expression->right->base.type);
2546
2547         expression_kind_t kind = expression->base.kind;
2548
2549         switch (kind) {
2550         case EXPR_BINARY_SHIFTLEFT:
2551         case EXPR_BINARY_SHIFTRIGHT:
2552         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2553         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2554                 mode  = get_ir_mode_arithmetic(expression->base.type);
2555                 right = create_conv(dbgi, right, atomic_modes[ATOMIC_TYPE_UINT]);
2556                 break;
2557
2558         case EXPR_BINARY_SUB:
2559                 if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
2560                         const pointer_type_t *const ptr_type = &type_left->pointer;
2561
2562                         mode = get_ir_mode_arithmetic(expression->base.type);
2563                         ir_node *const elem_size = get_type_size_node(ptr_type->points_to);
2564                         ir_node *const conv_size = new_d_Conv(dbgi, elem_size, mode);
2565                         ir_node *const sub       = new_d_Sub(dbgi, left, right, mode);
2566                         ir_node *const no_mem    = new_NoMem();
2567                         ir_node *const div       = new_d_DivRL(dbgi, no_mem, sub, conv_size,
2568                                                                                                    mode, op_pin_state_floats);
2569                         return new_d_Proj(dbgi, div, mode, pn_Div_res);
2570                 }
2571                 /* fallthrough */
2572         case EXPR_BINARY_SUB_ASSIGN:
2573                 if (is_type_pointer(type_left)) {
2574                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2575                         mode  = get_ir_mode_arithmetic(type_left);
2576                         break;
2577                 }
2578                 goto normal_node;
2579
2580         case EXPR_BINARY_ADD:
2581         case EXPR_BINARY_ADD_ASSIGN:
2582                 if (is_type_pointer(type_left)) {
2583                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2584                         mode  = get_ir_mode_arithmetic(type_left);
2585                         break;
2586                 } else if (is_type_pointer(type_right)) {
2587                         left  = adjust_for_pointer_arithmetic(dbgi, left, type_right);
2588                         mode  = get_ir_mode_arithmetic(type_right);
2589                         break;
2590                 }
2591                 goto normal_node;
2592
2593         default:
2594 normal_node:
2595                 mode = get_ir_mode_arithmetic(type_right);
2596                 left = create_conv(dbgi, left, mode);
2597                 break;
2598         }
2599
2600         switch (kind) {
2601         case EXPR_BINARY_ADD_ASSIGN:
2602         case EXPR_BINARY_ADD:
2603                 return new_d_Add(dbgi, left, right, mode);
2604         case EXPR_BINARY_SUB_ASSIGN:
2605         case EXPR_BINARY_SUB:
2606                 return new_d_Sub(dbgi, left, right, mode);
2607         case EXPR_BINARY_MUL_ASSIGN:
2608         case EXPR_BINARY_MUL:
2609                 return new_d_Mul(dbgi, left, right, mode);
2610         case EXPR_BINARY_BITWISE_AND:
2611         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2612                 return new_d_And(dbgi, left, right, mode);
2613         case EXPR_BINARY_BITWISE_OR:
2614         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2615                 return new_d_Or(dbgi, left, right, mode);
2616         case EXPR_BINARY_BITWISE_XOR:
2617         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2618                 return new_d_Eor(dbgi, left, right, mode);
2619         case EXPR_BINARY_SHIFTLEFT:
2620         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2621                 return new_d_Shl(dbgi, left, right, mode);
2622         case EXPR_BINARY_SHIFTRIGHT:
2623         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2624                 if (mode_is_signed(mode)) {
2625                         return new_d_Shrs(dbgi, left, right, mode);
2626                 } else {
2627                         return new_d_Shr(dbgi, left, right, mode);
2628                 }
2629         case EXPR_BINARY_DIV:
2630         case EXPR_BINARY_DIV_ASSIGN: {
2631                 ir_node *pin = new_Pin(new_NoMem());
2632                 ir_node *op  = new_d_Div(dbgi, pin, left, right, mode,
2633                                          op_pin_state_floats);
2634                 ir_node *res = new_d_Proj(dbgi, op, mode, pn_Div_res);
2635                 return res;
2636         }
2637         case EXPR_BINARY_MOD:
2638         case EXPR_BINARY_MOD_ASSIGN: {
2639                 ir_node *pin = new_Pin(new_NoMem());
2640                 assert(!mode_is_float(mode));
2641                 ir_node *op  = new_d_Mod(dbgi, pin, left, right, mode,
2642                                          op_pin_state_floats);
2643                 ir_node *res = new_d_Proj(dbgi, op, mode, pn_Mod_res);
2644                 return res;
2645         }
2646         default:
2647                 panic("unexpected expression kind");
2648         }
2649 }
2650
2651 static ir_node *create_lazy_op(const binary_expression_t *expression)
2652 {
2653         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2654         type_t   *type = skip_typeref(expression->base.type);
2655         ir_mode  *mode = get_ir_mode_arithmetic(type);
2656
2657         if (is_constant_expression(expression->left) == EXPR_CLASS_CONSTANT) {
2658                 bool val = fold_constant_to_bool(expression->left);
2659                 expression_kind_t ekind = expression->base.kind;
2660                 assert(ekind == EXPR_BINARY_LOGICAL_AND || ekind == EXPR_BINARY_LOGICAL_OR);
2661                 if (ekind == EXPR_BINARY_LOGICAL_AND) {
2662                         if (!val) {
2663                                 return new_Const(get_mode_null(mode));
2664                         }
2665                 } else {
2666                         if (val) {
2667                                 return new_Const(get_mode_one(mode));
2668                         }
2669                 }
2670
2671                 if (is_constant_expression(expression->right) == EXPR_CLASS_CONSTANT) {
2672                         bool valr = fold_constant_to_bool(expression->right);
2673                         return create_Const_from_bool(mode, valr);
2674                 }
2675
2676                 return produce_condition_result(expression->right, mode, dbgi);
2677         }
2678
2679         return produce_condition_result((const expression_t*) expression, mode,
2680                                         dbgi);
2681 }
2682
2683 typedef ir_node * (*create_arithmetic_func)(dbg_info *dbgi, ir_node *left,
2684                                             ir_node *right, ir_mode *mode);
2685
2686 static ir_node *create_assign_binop(const binary_expression_t *expression)
2687 {
2688         dbg_info *const     dbgi = get_dbg_info(&expression->base.source_position);
2689         const expression_t *left_expr = expression->left;
2690         type_t             *type      = skip_typeref(left_expr->base.type);
2691         ir_node            *right     = expression_to_firm(expression->right);
2692         ir_node            *left_addr = expression_to_addr(left_expr);
2693         ir_node            *left      = get_value_from_lvalue(left_expr, left_addr);
2694         ir_node            *result    = create_op(dbgi, expression, left, right);
2695
2696         result = create_cast(dbgi, result, expression->right->base.type, type);
2697         result = do_strict_conv(dbgi, result);
2698
2699         result = set_value_for_expression_addr(left_expr, result, left_addr);
2700
2701         if (!is_type_compound(type)) {
2702                 ir_mode *mode_arithmetic = get_ir_mode_arithmetic(type);
2703                 result = create_conv(dbgi, result, mode_arithmetic);
2704         }
2705         return result;
2706 }
2707
2708 static ir_node *binary_expression_to_firm(const binary_expression_t *expression)
2709 {
2710         expression_kind_t kind = expression->base.kind;
2711
2712         switch(kind) {
2713         case EXPR_BINARY_EQUAL:
2714         case EXPR_BINARY_NOTEQUAL:
2715         case EXPR_BINARY_LESS:
2716         case EXPR_BINARY_LESSEQUAL:
2717         case EXPR_BINARY_GREATER:
2718         case EXPR_BINARY_GREATEREQUAL:
2719         case EXPR_BINARY_ISGREATER:
2720         case EXPR_BINARY_ISGREATEREQUAL:
2721         case EXPR_BINARY_ISLESS:
2722         case EXPR_BINARY_ISLESSEQUAL:
2723         case EXPR_BINARY_ISLESSGREATER:
2724         case EXPR_BINARY_ISUNORDERED: {
2725                 dbg_info   *dbgi     = get_dbg_info(&expression->base.source_position);
2726                 ir_node    *left     = expression_to_firm(expression->left);
2727                 ir_node    *right    = expression_to_firm(expression->right);
2728                 ir_relation relation = get_relation(kind);
2729                 ir_node    *cmp      = new_d_Cmp(dbgi, left, right, relation);
2730                 return cmp;
2731         }
2732         case EXPR_BINARY_ASSIGN: {
2733                 ir_node *addr  = expression_to_addr(expression->left);
2734                 ir_node *right = expression_to_firm(expression->right);
2735                 ir_node *res
2736                         = set_value_for_expression_addr(expression->left, right, addr);
2737
2738                 type_t  *type            = skip_typeref(expression->base.type);
2739                 if (!is_type_compound(type)) {
2740                         ir_mode *mode_arithmetic = get_ir_mode_arithmetic(type);
2741                         res                      = create_conv(NULL, res, mode_arithmetic);
2742                 }
2743                 return res;
2744         }
2745         case EXPR_BINARY_ADD:
2746         case EXPR_BINARY_SUB:
2747         case EXPR_BINARY_MUL:
2748         case EXPR_BINARY_DIV:
2749         case EXPR_BINARY_MOD:
2750         case EXPR_BINARY_BITWISE_AND:
2751         case EXPR_BINARY_BITWISE_OR:
2752         case EXPR_BINARY_BITWISE_XOR:
2753         case EXPR_BINARY_SHIFTLEFT:
2754         case EXPR_BINARY_SHIFTRIGHT:
2755         {
2756                 dbg_info *dbgi  = get_dbg_info(&expression->base.source_position);
2757                 ir_node  *left  = expression_to_firm(expression->left);
2758                 ir_node  *right = expression_to_firm(expression->right);
2759                 return create_op(dbgi, expression, left, right);
2760         }
2761         case EXPR_BINARY_LOGICAL_AND:
2762         case EXPR_BINARY_LOGICAL_OR:
2763                 return create_lazy_op(expression);
2764         case EXPR_BINARY_COMMA:
2765                 /* create side effects of left side */
2766                 (void) expression_to_firm(expression->left);
2767                 return _expression_to_firm(expression->right);
2768
2769         case EXPR_BINARY_ADD_ASSIGN:
2770         case EXPR_BINARY_SUB_ASSIGN:
2771         case EXPR_BINARY_MUL_ASSIGN:
2772         case EXPR_BINARY_MOD_ASSIGN:
2773         case EXPR_BINARY_DIV_ASSIGN:
2774         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2775         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2776         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2777         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2778         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2779                 return create_assign_binop(expression);
2780         default:
2781                 panic("TODO binexpr type");
2782         }
2783 }
2784
2785 static ir_node *array_access_addr(const array_access_expression_t *expression)
2786 {
2787         dbg_info *dbgi        = get_dbg_info(&expression->base.source_position);
2788         ir_node  *base_addr   = expression_to_firm(expression->array_ref);
2789         ir_node  *offset      = expression_to_firm(expression->index);
2790         type_t   *ref_type    = skip_typeref(expression->array_ref->base.type);
2791         ir_node  *real_offset = adjust_for_pointer_arithmetic(dbgi, offset, ref_type);
2792         ir_node  *result      = new_d_Add(dbgi, base_addr, real_offset, mode_P_data);
2793
2794         return result;
2795 }
2796
2797 static ir_node *array_access_to_firm(
2798                 const array_access_expression_t *expression)
2799 {
2800         dbg_info *dbgi   = get_dbg_info(&expression->base.source_position);
2801         ir_node  *addr   = array_access_addr(expression);
2802         type_t   *type   = revert_automatic_type_conversion(
2803                         (const expression_t*) expression);
2804         type             = skip_typeref(type);
2805
2806         return deref_address(dbgi, type, addr);
2807 }
2808
2809 static long get_offsetof_offset(const offsetof_expression_t *expression)
2810 {
2811         type_t *orig_type = expression->type;
2812         long    offset    = 0;
2813
2814         designator_t *designator = expression->designator;
2815         for ( ; designator != NULL; designator = designator->next) {
2816                 type_t *type = skip_typeref(orig_type);
2817                 /* be sure the type is constructed */
2818                 (void) get_ir_type(type);
2819
2820                 if (designator->symbol != NULL) {
2821                         assert(is_type_compound(type));
2822                         symbol_t *symbol = designator->symbol;
2823
2824                         compound_t *compound = type->compound.compound;
2825                         entity_t   *iter     = compound->members.entities;
2826                         for ( ; iter != NULL; iter = iter->base.next) {
2827                                 if (iter->base.symbol == symbol) {
2828                                         break;
2829                                 }
2830                         }
2831                         assert(iter != NULL);
2832
2833                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
2834                         assert(iter->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
2835                         offset += get_entity_offset(iter->compound_member.entity);
2836
2837                         orig_type = iter->declaration.type;
2838                 } else {
2839                         expression_t *array_index = designator->array_index;
2840                         assert(designator->array_index != NULL);
2841                         assert(is_type_array(type));
2842
2843                         long index         = fold_constant_to_int(array_index);
2844                         ir_type *arr_type  = get_ir_type(type);
2845                         ir_type *elem_type = get_array_element_type(arr_type);
2846                         long     elem_size = get_type_size_bytes(elem_type);
2847
2848                         offset += index * elem_size;
2849
2850                         orig_type = type->array.element_type;
2851                 }
2852         }
2853
2854         return offset;
2855 }
2856
2857 static ir_node *offsetof_to_firm(const offsetof_expression_t *expression)
2858 {
2859         ir_mode   *mode   = get_ir_mode_arithmetic(expression->base.type);
2860         long       offset = get_offsetof_offset(expression);
2861         ir_tarval *tv     = new_tarval_from_long(offset, mode);
2862         dbg_info  *dbgi   = get_dbg_info(&expression->base.source_position);
2863
2864         return new_d_Const(dbgi, tv);
2865 }
2866
2867 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
2868                                      ir_entity *entity, type_t *type);
2869 static ir_initializer_t *create_ir_initializer(
2870                 const initializer_t *initializer, type_t *type);
2871
2872 static ir_entity *create_initializer_entity(dbg_info *dbgi,
2873                                             initializer_t *initializer,
2874                                             type_t *type)
2875 {
2876         /* create the ir_initializer */
2877         ir_graph *const old_current_ir_graph = current_ir_graph;
2878         current_ir_graph = get_const_code_irg();
2879
2880         ir_initializer_t *irinitializer = create_ir_initializer(initializer, type);
2881
2882         assert(current_ir_graph == get_const_code_irg());
2883         current_ir_graph = old_current_ir_graph;
2884
2885         ident     *const id          = id_unique("initializer.%u");
2886         ir_type   *const irtype      = get_ir_type(type);
2887         ir_type   *const global_type = get_glob_type();
2888         ir_entity *const entity      = new_d_entity(global_type, id, irtype, dbgi);
2889         set_entity_ld_ident(entity, id);
2890         set_entity_visibility(entity, ir_visibility_private);
2891         add_entity_linkage(entity, IR_LINKAGE_CONSTANT);
2892         set_entity_initializer(entity, irinitializer);
2893         return entity;
2894 }
2895
2896 static ir_node *compound_literal_addr(compound_literal_expression_t const *const expression)
2897 {
2898         dbg_info      *dbgi        = get_dbg_info(&expression->base.source_position);
2899         type_t        *type        = expression->type;
2900         initializer_t *initializer = expression->initializer;
2901
2902         if (is_constant_initializer(initializer) == EXPR_CLASS_CONSTANT) {
2903                 ir_entity *entity = create_initializer_entity(dbgi, initializer, type);
2904                 return create_symconst(dbgi, entity);
2905         } else {
2906                 /* create an entity on the stack */
2907                 ident   *const id     = id_unique("CompLit.%u");
2908                 ir_type *const irtype = get_ir_type(type);
2909                 ir_type *frame_type   = get_irg_frame_type(current_ir_graph);
2910
2911                 ir_entity *const entity = new_d_entity(frame_type, id, irtype, dbgi);
2912                 set_entity_ld_ident(entity, id);
2913
2914                 /* create initialisation code */
2915                 create_local_initializer(initializer, dbgi, entity, type);
2916
2917                 /* create a sel for the compound literal address */
2918                 ir_node *frame = get_irg_frame(current_ir_graph);
2919                 ir_node *sel   = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
2920                 return sel;
2921         }
2922 }
2923
2924 static ir_node *compound_literal_to_firm(compound_literal_expression_t const* const expr)
2925 {
2926         dbg_info *const dbgi = get_dbg_info(&expr->base.source_position);
2927         type_t   *const type = expr->type;
2928         ir_node  *const addr = compound_literal_addr(expr);
2929         return deref_address(dbgi, type, addr);
2930 }
2931
2932 /**
2933  * Transform a sizeof expression into Firm code.
2934  */
2935 static ir_node *sizeof_to_firm(const typeprop_expression_t *expression)
2936 {
2937         type_t *const type = skip_typeref(expression->type);
2938         /* §6.5.3.4:2 if the type is a VLA, evaluate the expression. */
2939         if (is_type_array(type) && type->array.is_vla
2940                         && expression->tp_expression != NULL) {
2941                 expression_to_firm(expression->tp_expression);
2942         }
2943         /* strange gnu extensions: sizeof(function) == 1 */
2944         if (is_type_function(type)) {
2945                 ir_mode *mode = get_ir_mode_storage(type_size_t);
2946                 return new_Const(get_mode_one(mode));
2947         }
2948
2949         return get_type_size_node(type);
2950 }
2951
2952 static entity_t *get_expression_entity(const expression_t *expression)
2953 {
2954         if (expression->kind != EXPR_REFERENCE)
2955                 return NULL;
2956
2957         return expression->reference.entity;
2958 }
2959
2960 static unsigned get_cparser_entity_alignment(const entity_t *entity)
2961 {
2962         switch(entity->kind) {
2963         case DECLARATION_KIND_CASES:
2964                 return entity->declaration.alignment;
2965         case ENTITY_STRUCT:
2966         case ENTITY_UNION:
2967                 return entity->compound.alignment;
2968         case ENTITY_TYPEDEF:
2969                 return entity->typedefe.alignment;
2970         default:
2971                 break;
2972         }
2973         return 0;
2974 }
2975
2976 /**
2977  * Transform an alignof expression into Firm code.
2978  */
2979 static ir_node *alignof_to_firm(const typeprop_expression_t *expression)
2980 {
2981         unsigned alignment = 0;
2982
2983         const expression_t *tp_expression = expression->tp_expression;
2984         if (tp_expression != NULL) {
2985                 entity_t *entity = get_expression_entity(tp_expression);
2986                 if (entity != NULL) {
2987                         if (entity->kind == ENTITY_FUNCTION) {
2988                                 /* a gnu-extension */
2989                                 alignment = 1;
2990                         } else {
2991                                 alignment = get_cparser_entity_alignment(entity);
2992                         }
2993                 }
2994         }
2995
2996         if (alignment == 0) {
2997                 type_t *type = expression->type;
2998                 alignment = get_type_alignment(type);
2999         }
3000
3001         dbg_info  *dbgi = get_dbg_info(&expression->base.source_position);
3002         ir_mode   *mode = get_ir_mode_arithmetic(expression->base.type);
3003         ir_tarval *tv   = new_tarval_from_long(alignment, mode);
3004         return new_d_Const(dbgi, tv);
3005 }
3006
3007 static void init_ir_types(void);
3008
3009 static ir_tarval *fold_constant_to_tarval(const expression_t *expression)
3010 {
3011         assert(is_type_valid(skip_typeref(expression->base.type)));
3012
3013         bool constant_folding_old = constant_folding;
3014         constant_folding = true;
3015         int old_optimize         = get_optimize();
3016         int old_constant_folding = get_opt_constant_folding();
3017         set_optimize(1);
3018         set_opt_constant_folding(1);
3019
3020         init_ir_types();
3021
3022         assert(is_constant_expression(expression) == EXPR_CLASS_CONSTANT);
3023
3024         ir_graph *old_current_ir_graph = current_ir_graph;
3025         current_ir_graph = get_const_code_irg();
3026
3027         ir_node *cnst = expression_to_firm(expression);
3028         current_ir_graph = old_current_ir_graph;
3029         set_optimize(old_optimize);
3030         set_opt_constant_folding(old_constant_folding);
3031
3032         if (!is_Const(cnst)) {
3033                 panic("couldn't fold constant");
3034         }
3035
3036         constant_folding = constant_folding_old;
3037
3038         return get_Const_tarval(cnst);
3039 }
3040
3041 /* this function is only used in parser.c, but it relies on libfirm functionality */
3042 bool constant_is_negative(const expression_t *expression)
3043 {
3044         assert(is_constant_expression(expression) == EXPR_CLASS_CONSTANT);
3045         ir_tarval *tv = fold_constant_to_tarval(expression);
3046         return tarval_is_negative(tv);
3047 }
3048
3049 long fold_constant_to_int(const expression_t *expression)
3050 {
3051         if (expression->kind == EXPR_ERROR)
3052                 return 0;
3053
3054         ir_tarval *tv = fold_constant_to_tarval(expression);
3055         if (!tarval_is_long(tv)) {
3056                 panic("result of constant folding is not integer");
3057         }
3058
3059         return get_tarval_long(tv);
3060 }
3061
3062 bool fold_constant_to_bool(const expression_t *expression)
3063 {
3064         if (expression->kind == EXPR_ERROR)
3065                 return false;
3066         ir_tarval *tv = fold_constant_to_tarval(expression);
3067         return !tarval_is_null(tv);
3068 }
3069
3070 static ir_node *conditional_to_firm(const conditional_expression_t *expression)
3071 {
3072         dbg_info *const dbgi = get_dbg_info(&expression->base.source_position);
3073
3074         /* first try to fold a constant condition */
3075         if (is_constant_expression(expression->condition) == EXPR_CLASS_CONSTANT) {
3076                 bool val = fold_constant_to_bool(expression->condition);
3077                 if (val) {
3078                         expression_t *true_expression = expression->true_expression;
3079                         if (true_expression == NULL)
3080                                 true_expression = expression->condition;
3081                         return expression_to_firm(true_expression);
3082                 } else {
3083                         return expression_to_firm(expression->false_expression);
3084                 }
3085         }
3086
3087         ir_node *const true_block  = new_immBlock();
3088         ir_node *const false_block = new_immBlock();
3089         ir_node *const cond_expr   = create_condition_evaluation(expression->condition, true_block, false_block);
3090         mature_immBlock(true_block);
3091         mature_immBlock(false_block);
3092
3093         set_cur_block(true_block);
3094         ir_node *true_val;
3095         if (expression->true_expression != NULL) {
3096                 true_val = expression_to_firm(expression->true_expression);
3097         } else if (cond_expr != NULL && get_irn_mode(cond_expr) != mode_b) {
3098                 true_val = cond_expr;
3099         } else {
3100                 /* Condition ended with a short circuit (&&, ||, !) operation or a
3101                  * comparison.  Generate a "1" as value for the true branch. */
3102                 true_val = new_Const(get_mode_one(mode_Is));
3103         }
3104         ir_node *const true_jmp = new_d_Jmp(dbgi);
3105
3106         set_cur_block(false_block);
3107         ir_node *const false_val = expression_to_firm(expression->false_expression);
3108         ir_node *const false_jmp = new_d_Jmp(dbgi);
3109
3110         /* create the common block */
3111         ir_node *const in_cf[2] = { true_jmp, false_jmp };
3112         ir_node *const block    = new_Block(lengthof(in_cf), in_cf);
3113         set_cur_block(block);
3114
3115         /* TODO improve static semantics, so either both or no values are NULL */
3116         if (true_val == NULL || false_val == NULL)
3117                 return NULL;
3118
3119         ir_node *const in[2] = { true_val, false_val };
3120         type_t  *const type  = skip_typeref(expression->base.type);
3121         ir_mode *mode;
3122         if (is_type_compound(type)) {
3123                 mode = mode_P;
3124         } else {
3125                 mode = get_ir_mode_arithmetic(type);
3126         }
3127         ir_node *const val   = new_d_Phi(dbgi, lengthof(in), in, mode);
3128
3129         return val;
3130 }
3131
3132 /**
3133  * Returns an IR-node representing the address of a field.
3134  */
3135 static ir_node *select_addr(const select_expression_t *expression)
3136 {
3137         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3138
3139         construct_select_compound(expression);
3140
3141         ir_node *compound_addr = expression_to_firm(expression->compound);
3142
3143         entity_t *entry = expression->compound_entry;
3144         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3145         assert(entry->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
3146
3147         if (constant_folding) {
3148                 ir_mode *mode      = get_irn_mode(compound_addr);
3149                 ir_mode *mode_uint = get_reference_mode_unsigned_eq(mode);
3150                 ir_node *ofs       = new_Const_long(mode_uint, entry->compound_member.offset);
3151                 return new_d_Add(dbgi, compound_addr, ofs, mode);
3152         } else {
3153                 ir_entity *irentity = entry->compound_member.entity;
3154                 assert(irentity != NULL);
3155                 return new_d_simpleSel(dbgi, new_NoMem(), compound_addr, irentity);
3156         }
3157 }
3158
3159 static ir_node *select_to_firm(const select_expression_t *expression)
3160 {
3161         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3162         ir_node  *addr = select_addr(expression);
3163         type_t   *type = revert_automatic_type_conversion(
3164                         (const expression_t*) expression);
3165         type           = skip_typeref(type);
3166
3167         entity_t *entry = expression->compound_entry;
3168         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3169
3170         if (entry->compound_member.bitfield) {
3171                 return bitfield_extract_to_firm(expression, addr);
3172         }
3173
3174         return deref_address(dbgi, type, addr);
3175 }
3176
3177 /* Values returned by __builtin_classify_type. */
3178 typedef enum gcc_type_class
3179 {
3180         no_type_class = -1,
3181         void_type_class,
3182         integer_type_class,
3183         char_type_class,
3184         enumeral_type_class,
3185         boolean_type_class,
3186         pointer_type_class,
3187         reference_type_class,
3188         offset_type_class,
3189         real_type_class,
3190         complex_type_class,
3191         function_type_class,
3192         method_type_class,
3193         record_type_class,
3194         union_type_class,
3195         array_type_class,
3196         string_type_class,
3197         set_type_class,
3198         file_type_class,
3199         lang_type_class
3200 } gcc_type_class;
3201
3202 static ir_node *classify_type_to_firm(const classify_type_expression_t *const expr)
3203 {
3204         type_t *type = expr->type_expression->base.type;
3205
3206         /* FIXME gcc returns different values depending on whether compiling C or C++
3207          * e.g. int x[10] is pointer_type_class in C, but array_type_class in C++ */
3208         gcc_type_class tc;
3209         for (;;) {
3210                 type = skip_typeref(type);
3211                 switch (type->kind) {
3212                         case TYPE_ATOMIC: {
3213                                 const atomic_type_t *const atomic_type = &type->atomic;
3214                                 switch (atomic_type->akind) {
3215                                         /* should not be reached */
3216                                         case ATOMIC_TYPE_INVALID:
3217                                                 tc = no_type_class;
3218                                                 goto make_const;
3219
3220                                         /* gcc cannot do that */
3221                                         case ATOMIC_TYPE_VOID:
3222                                                 tc = void_type_class;
3223                                                 goto make_const;
3224
3225                                         case ATOMIC_TYPE_WCHAR_T:   /* gcc handles this as integer */
3226                                         case ATOMIC_TYPE_CHAR:      /* gcc handles this as integer */
3227                                         case ATOMIC_TYPE_SCHAR:     /* gcc handles this as integer */
3228                                         case ATOMIC_TYPE_UCHAR:     /* gcc handles this as integer */
3229                                         case ATOMIC_TYPE_SHORT:
3230                                         case ATOMIC_TYPE_USHORT:
3231                                         case ATOMIC_TYPE_INT:
3232                                         case ATOMIC_TYPE_UINT:
3233                                         case ATOMIC_TYPE_LONG:
3234                                         case ATOMIC_TYPE_ULONG:
3235                                         case ATOMIC_TYPE_LONGLONG:
3236                                         case ATOMIC_TYPE_ULONGLONG:
3237                                         case ATOMIC_TYPE_BOOL:      /* gcc handles this as integer */
3238                                                 tc = integer_type_class;
3239                                                 goto make_const;
3240
3241                                         case ATOMIC_TYPE_FLOAT:
3242                                         case ATOMIC_TYPE_DOUBLE:
3243                                         case ATOMIC_TYPE_LONG_DOUBLE:
3244                                                 tc = real_type_class;
3245                                                 goto make_const;
3246                                 }
3247                                 panic("Unexpected atomic type in classify_type_to_firm().");
3248                         }
3249
3250                         case TYPE_COMPLEX:         tc = complex_type_class; goto make_const;
3251                         case TYPE_IMAGINARY:       tc = complex_type_class; goto make_const;
3252                         case TYPE_ARRAY:           /* gcc handles this as pointer */
3253                         case TYPE_FUNCTION:        /* gcc handles this as pointer */
3254                         case TYPE_POINTER:         tc = pointer_type_class; goto make_const;
3255                         case TYPE_COMPOUND_STRUCT: tc = record_type_class;  goto make_const;
3256                         case TYPE_COMPOUND_UNION:  tc = union_type_class;   goto make_const;
3257
3258                         /* gcc handles this as integer */
3259                         case TYPE_ENUM:            tc = integer_type_class; goto make_const;
3260
3261                         /* gcc classifies the referenced type */
3262                         case TYPE_REFERENCE: type = type->reference.refers_to; continue;
3263
3264                         /* typedef/typeof should be skipped already */
3265                         case TYPE_TYPEDEF:
3266                         case TYPE_TYPEOF:
3267                         case TYPE_ERROR:
3268                                 break;
3269                 }
3270                 panic("unexpected TYPE classify_type_to_firm().");
3271         }
3272
3273 make_const:;
3274         dbg_info  *const dbgi = get_dbg_info(&expr->base.source_position);
3275         ir_mode   *const mode = atomic_modes[ATOMIC_TYPE_INT];
3276         ir_tarval *const tv   = new_tarval_from_long(tc, mode);
3277         return new_d_Const(dbgi, tv);
3278 }
3279
3280 static ir_node *function_name_to_firm(
3281                 const funcname_expression_t *const expr)
3282 {
3283         switch(expr->kind) {
3284         case FUNCNAME_FUNCTION:
3285         case FUNCNAME_PRETTY_FUNCTION:
3286         case FUNCNAME_FUNCDNAME:
3287                 if (current_function_name == NULL) {
3288                         const source_position_t *const src_pos = &expr->base.source_position;
3289                         const char    *name  = current_function_entity->base.symbol->string;
3290                         const string_t string = { name, strlen(name) + 1 };
3291                         current_function_name = string_to_firm(src_pos, "__func__.%u", &string);
3292                 }
3293                 return current_function_name;
3294         case FUNCNAME_FUNCSIG:
3295                 if (current_funcsig == NULL) {
3296                         const source_position_t *const src_pos = &expr->base.source_position;
3297                         ir_entity *ent = get_irg_entity(current_ir_graph);
3298                         const char *const name = get_entity_ld_name(ent);
3299                         const string_t string = { name, strlen(name) + 1 };
3300                         current_funcsig = string_to_firm(src_pos, "__FUNCSIG__.%u", &string);
3301                 }
3302                 return current_funcsig;
3303         }
3304         panic("Unsupported function name");
3305 }
3306
3307 static ir_node *statement_expression_to_firm(const statement_expression_t *expr)
3308 {
3309         statement_t *statement = expr->statement;
3310
3311         assert(statement->kind == STATEMENT_COMPOUND);
3312         return compound_statement_to_firm(&statement->compound);
3313 }
3314
3315 static ir_node *va_start_expression_to_firm(
3316         const va_start_expression_t *const expr)
3317 {
3318         ir_entity *param_ent = current_vararg_entity;
3319         if (param_ent == NULL) {
3320                 size_t   const n           = IR_VA_START_PARAMETER_NUMBER;
3321                 ir_type *const frame_type  = get_irg_frame_type(current_ir_graph);
3322                 ir_type *const param_type  = get_unknown_type();
3323                 param_ent = new_parameter_entity(frame_type, n, param_type);
3324                 current_vararg_entity = param_ent;
3325         }
3326
3327         ir_node  *const frame   = get_irg_frame(current_ir_graph);
3328         dbg_info *const dbgi    = get_dbg_info(&expr->base.source_position);
3329         ir_node  *const no_mem  = new_NoMem();
3330         ir_node  *const arg_sel = new_d_simpleSel(dbgi, no_mem, frame, param_ent);
3331
3332         set_value_for_expression(expr->ap, arg_sel);
3333
3334         return NULL;
3335 }
3336
3337 static ir_node *va_arg_expression_to_firm(const va_arg_expression_t *const expr)
3338 {
3339         type_t       *const type    = expr->base.type;
3340         expression_t *const ap_expr = expr->ap;
3341         ir_node      *const ap_addr = expression_to_addr(ap_expr);
3342         ir_node      *const ap      = get_value_from_lvalue(ap_expr, ap_addr);
3343         dbg_info     *const dbgi    = get_dbg_info(&expr->base.source_position);
3344         ir_node      *const res     = deref_address(dbgi, type, ap);
3345
3346         ir_node      *const cnst    = get_type_size_node(expr->base.type);
3347         ir_mode      *const mode    = get_irn_mode(cnst);
3348         ir_node      *const c1      = new_Const_long(mode, stack_param_align - 1);
3349         ir_node      *const c2      = new_d_Add(dbgi, cnst, c1, mode);
3350         ir_node      *const c3      = new_Const_long(mode, -(long)stack_param_align);
3351         ir_node      *const c4      = new_d_And(dbgi, c2, c3, mode);
3352         ir_node      *const add     = new_d_Add(dbgi, ap, c4, mode_P_data);
3353
3354         set_value_for_expression_addr(ap_expr, add, ap_addr);
3355
3356         return res;
3357 }
3358
3359 /**
3360  * Generate Firm for a va_copy expression.
3361  */
3362 static ir_node *va_copy_expression_to_firm(const va_copy_expression_t *const expr)
3363 {
3364         ir_node *const src = expression_to_firm(expr->src);
3365         set_value_for_expression(expr->dst, src);
3366         return NULL;
3367 }
3368
3369 static ir_node *dereference_addr(const unary_expression_t *const expression)
3370 {
3371         assert(expression->base.kind == EXPR_UNARY_DEREFERENCE);
3372         return expression_to_firm(expression->value);
3373 }
3374
3375 /**
3376  * Returns a IR-node representing an lvalue of the given expression.
3377  */
3378 static ir_node *expression_to_addr(const expression_t *expression)
3379 {
3380         switch(expression->kind) {
3381         case EXPR_ARRAY_ACCESS:
3382                 return array_access_addr(&expression->array_access);
3383         case EXPR_CALL:
3384                 return call_expression_to_firm(&expression->call);
3385         case EXPR_COMPOUND_LITERAL:
3386                 return compound_literal_addr(&expression->compound_literal);
3387         case EXPR_REFERENCE:
3388                 return reference_addr(&expression->reference);
3389         case EXPR_SELECT:
3390                 return select_addr(&expression->select);
3391         case EXPR_UNARY_DEREFERENCE:
3392                 return dereference_addr(&expression->unary);
3393         default:
3394                 break;
3395         }
3396         panic("trying to get address of non-lvalue");
3397 }
3398
3399 static ir_node *builtin_constant_to_firm(
3400                 const builtin_constant_expression_t *expression)
3401 {
3402         ir_mode *const mode = get_ir_mode_arithmetic(expression->base.type);
3403         bool     const v    = is_constant_expression(expression->value) == EXPR_CLASS_CONSTANT;
3404         return create_Const_from_bool(mode, v);
3405 }
3406
3407 static ir_node *builtin_types_compatible_to_firm(
3408                 const builtin_types_compatible_expression_t *expression)
3409 {
3410         type_t  *const left  = get_unqualified_type(skip_typeref(expression->left));
3411         type_t  *const right = get_unqualified_type(skip_typeref(expression->right));
3412         bool     const value = types_compatible(left, right);
3413         ir_mode *const mode  = get_ir_mode_arithmetic(expression->base.type);
3414         return create_Const_from_bool(mode, value);
3415 }
3416
3417 static ir_node *get_label_block(label_t *label)
3418 {
3419         if (label->block != NULL)
3420                 return label->block;
3421
3422         /* beware: might be called from create initializer with current_ir_graph
3423          * set to const_code_irg. */
3424         ir_graph *rem    = current_ir_graph;
3425         current_ir_graph = current_function;
3426
3427         ir_node *block = new_immBlock();
3428
3429         label->block = block;
3430
3431         ARR_APP1(label_t *, all_labels, label);
3432
3433         current_ir_graph = rem;
3434         return block;
3435 }
3436
3437 /**
3438  * Pointer to a label.  This is used for the
3439  * GNU address-of-label extension.
3440  */
3441 static ir_node *label_address_to_firm(const label_address_expression_t *label)
3442 {
3443         dbg_info  *dbgi   = get_dbg_info(&label->base.source_position);
3444         ir_node   *block  = get_label_block(label->label);
3445         ir_entity *entity = create_Block_entity(block);
3446
3447         symconst_symbol value;
3448         value.entity_p = entity;
3449         return new_d_SymConst(dbgi, mode_P_code, value, symconst_addr_ent);
3450 }
3451
3452 static ir_node *error_to_firm(const expression_t *expression)
3453 {
3454         ir_mode *mode = get_ir_mode_arithmetic(expression->base.type);
3455         return new_Bad(mode);
3456 }
3457
3458 /**
3459  * creates firm nodes for an expression. The difference between this function
3460  * and expression_to_firm is, that this version might produce mode_b nodes
3461  * instead of mode_Is.
3462  */
3463 static ir_node *_expression_to_firm(const expression_t *expression)
3464 {
3465 #ifndef NDEBUG
3466         if (!constant_folding) {
3467                 assert(!expression->base.transformed);
3468                 ((expression_t*) expression)->base.transformed = true;
3469         }
3470 #endif
3471
3472         switch (expression->kind) {
3473         case EXPR_LITERAL_CASES:
3474                 return literal_to_firm(&expression->literal);
3475         case EXPR_STRING_LITERAL:
3476                 return string_to_firm(&expression->base.source_position, "str.%u",
3477                                       &expression->literal.value);
3478         case EXPR_WIDE_STRING_LITERAL:
3479                 return wide_string_literal_to_firm(&expression->string_literal);
3480         case EXPR_REFERENCE:
3481                 return reference_expression_to_firm(&expression->reference);
3482         case EXPR_REFERENCE_ENUM_VALUE:
3483                 return reference_expression_enum_value_to_firm(&expression->reference);
3484         case EXPR_CALL:
3485                 return call_expression_to_firm(&expression->call);
3486         case EXPR_UNARY_CASES:
3487                 return unary_expression_to_firm(&expression->unary);
3488         case EXPR_BINARY_CASES:
3489                 return binary_expression_to_firm(&expression->binary);
3490         case EXPR_ARRAY_ACCESS:
3491                 return array_access_to_firm(&expression->array_access);
3492         case EXPR_SIZEOF:
3493                 return sizeof_to_firm(&expression->typeprop);
3494         case EXPR_ALIGNOF:
3495                 return alignof_to_firm(&expression->typeprop);
3496         case EXPR_CONDITIONAL:
3497                 return conditional_to_firm(&expression->conditional);
3498         case EXPR_SELECT:
3499                 return select_to_firm(&expression->select);
3500         case EXPR_CLASSIFY_TYPE:
3501                 return classify_type_to_firm(&expression->classify_type);
3502         case EXPR_FUNCNAME:
3503                 return function_name_to_firm(&expression->funcname);
3504         case EXPR_STATEMENT:
3505                 return statement_expression_to_firm(&expression->statement);
3506         case EXPR_VA_START:
3507                 return va_start_expression_to_firm(&expression->va_starte);
3508         case EXPR_VA_ARG:
3509                 return va_arg_expression_to_firm(&expression->va_arge);
3510         case EXPR_VA_COPY:
3511                 return va_copy_expression_to_firm(&expression->va_copye);
3512         case EXPR_BUILTIN_CONSTANT_P:
3513                 return builtin_constant_to_firm(&expression->builtin_constant);
3514         case EXPR_BUILTIN_TYPES_COMPATIBLE_P:
3515                 return builtin_types_compatible_to_firm(&expression->builtin_types_compatible);
3516         case EXPR_OFFSETOF:
3517                 return offsetof_to_firm(&expression->offsetofe);
3518         case EXPR_COMPOUND_LITERAL:
3519                 return compound_literal_to_firm(&expression->compound_literal);
3520         case EXPR_LABEL_ADDRESS:
3521                 return label_address_to_firm(&expression->label_address);
3522
3523         case EXPR_ERROR:
3524                 return error_to_firm(expression);
3525         }
3526         panic("invalid expression found");
3527 }
3528
3529 /**
3530  * Check if a given expression is a GNU __builtin_expect() call.
3531  */
3532 static bool is_builtin_expect(const expression_t *expression)
3533 {
3534         if (expression->kind != EXPR_CALL)
3535                 return false;
3536
3537         expression_t *function = expression->call.function;
3538         if (function->kind != EXPR_REFERENCE)
3539                 return false;
3540         reference_expression_t *ref = &function->reference;
3541         if (ref->entity->kind         != ENTITY_FUNCTION ||
3542             ref->entity->function.btk != BUILTIN_EXPECT)
3543                 return false;
3544
3545         return true;
3546 }
3547
3548 static bool produces_mode_b(const expression_t *expression)
3549 {
3550         switch (expression->kind) {
3551         case EXPR_BINARY_EQUAL:
3552         case EXPR_BINARY_NOTEQUAL:
3553         case EXPR_BINARY_LESS:
3554         case EXPR_BINARY_LESSEQUAL:
3555         case EXPR_BINARY_GREATER:
3556         case EXPR_BINARY_GREATEREQUAL:
3557         case EXPR_BINARY_ISGREATER:
3558         case EXPR_BINARY_ISGREATEREQUAL:
3559         case EXPR_BINARY_ISLESS:
3560         case EXPR_BINARY_ISLESSEQUAL:
3561         case EXPR_BINARY_ISLESSGREATER:
3562         case EXPR_BINARY_ISUNORDERED:
3563         case EXPR_UNARY_NOT:
3564                 return true;
3565
3566         case EXPR_CALL:
3567                 if (is_builtin_expect(expression)) {
3568                         expression_t *argument = expression->call.arguments->expression;
3569                         return produces_mode_b(argument);
3570                 }
3571                 return false;
3572         case EXPR_BINARY_COMMA:
3573                 return produces_mode_b(expression->binary.right);
3574
3575         default:
3576                 return false;
3577         }
3578 }
3579
3580 static ir_node *expression_to_firm(const expression_t *expression)
3581 {
3582         if (!produces_mode_b(expression)) {
3583                 ir_node *res = _expression_to_firm(expression);
3584                 assert(res == NULL || get_irn_mode(res) != mode_b);
3585                 return res;
3586         }
3587
3588         if (is_constant_expression(expression) == EXPR_CLASS_CONSTANT) {
3589                 bool const constant_folding_old = constant_folding;
3590                 constant_folding = true;
3591                 ir_node *res  = _expression_to_firm(expression);
3592                 constant_folding = constant_folding_old;
3593                 ir_mode *mode = get_ir_mode_arithmetic(expression->base.type);
3594                 assert(is_Const(res));
3595                 return create_Const_from_bool(mode, !is_Const_null(res));
3596         }
3597
3598         /* we have to produce a 0/1 from the mode_b expression */
3599         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3600         ir_mode  *mode = get_ir_mode_arithmetic(expression->base.type);
3601         return produce_condition_result(expression, mode, dbgi);
3602 }
3603
3604 /**
3605  * create a short-circuit expression evaluation that tries to construct
3606  * efficient control flow structures for &&, || and ! expressions
3607  */
3608 static ir_node *create_condition_evaluation(const expression_t *expression,
3609                                             ir_node *true_block,
3610                                             ir_node *false_block)
3611 {
3612         switch(expression->kind) {
3613         case EXPR_UNARY_NOT: {
3614                 const unary_expression_t *unary_expression = &expression->unary;
3615                 create_condition_evaluation(unary_expression->value, false_block,
3616                                             true_block);
3617                 return NULL;
3618         }
3619         case EXPR_BINARY_LOGICAL_AND: {
3620                 const binary_expression_t *binary_expression = &expression->binary;
3621
3622                 ir_node *extra_block = new_immBlock();
3623                 create_condition_evaluation(binary_expression->left, extra_block,
3624                                             false_block);
3625                 mature_immBlock(extra_block);
3626                 set_cur_block(extra_block);
3627                 create_condition_evaluation(binary_expression->right, true_block,
3628                                             false_block);
3629                 return NULL;
3630         }
3631         case EXPR_BINARY_LOGICAL_OR: {
3632                 const binary_expression_t *binary_expression = &expression->binary;
3633
3634                 ir_node *extra_block = new_immBlock();
3635                 create_condition_evaluation(binary_expression->left, true_block,
3636                                             extra_block);
3637                 mature_immBlock(extra_block);
3638                 set_cur_block(extra_block);
3639                 create_condition_evaluation(binary_expression->right, true_block,
3640                                             false_block);
3641                 return NULL;
3642         }
3643         default:
3644                 break;
3645         }
3646
3647         dbg_info *dbgi       = get_dbg_info(&expression->base.source_position);
3648         ir_node  *cond_expr  = _expression_to_firm(expression);
3649         ir_node  *condition  = create_conv(dbgi, cond_expr, mode_b);
3650         ir_node  *cond       = new_d_Cond(dbgi, condition);
3651         ir_node  *true_proj  = new_d_Proj(dbgi, cond, mode_X, pn_Cond_true);
3652         ir_node  *false_proj = new_d_Proj(dbgi, cond, mode_X, pn_Cond_false);
3653
3654         /* set branch prediction info based on __builtin_expect */
3655         if (is_builtin_expect(expression) && is_Cond(cond)) {
3656                 call_argument_t *argument = expression->call.arguments->next;
3657                 if (is_constant_expression(argument->expression) == EXPR_CLASS_CONSTANT) {
3658                         bool               const cnst = fold_constant_to_bool(argument->expression);
3659                         cond_jmp_predicate const pred = cnst ? COND_JMP_PRED_TRUE : COND_JMP_PRED_FALSE;
3660                         set_Cond_jmp_pred(cond, pred);
3661                 }
3662         }
3663
3664         add_immBlock_pred(true_block, true_proj);
3665         add_immBlock_pred(false_block, false_proj);
3666
3667         set_unreachable_now();
3668         return cond_expr;
3669 }
3670
3671 static void create_variable_entity(entity_t *variable,
3672                                    declaration_kind_t declaration_kind,
3673                                    ir_type *parent_type)
3674 {
3675         assert(variable->kind == ENTITY_VARIABLE);
3676         type_t    *type = skip_typeref(variable->declaration.type);
3677
3678         ident     *const id        = new_id_from_str(variable->base.symbol->string);
3679         ir_type   *const irtype    = get_ir_type(type);
3680         dbg_info  *const dbgi      = get_dbg_info(&variable->base.source_position);
3681         ir_entity *const irentity  = new_d_entity(parent_type, id, irtype, dbgi);
3682         unsigned         alignment = variable->declaration.alignment;
3683
3684         set_entity_alignment(irentity, alignment);
3685
3686         handle_decl_modifiers(irentity, variable);
3687
3688         variable->declaration.kind  = (unsigned char) declaration_kind;
3689         variable->variable.v.entity = irentity;
3690         set_entity_ld_ident(irentity, create_ld_ident(variable));
3691
3692         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
3693                 set_entity_volatility(irentity, volatility_is_volatile);
3694         }
3695 }
3696
3697
3698 typedef struct type_path_entry_t type_path_entry_t;
3699 struct type_path_entry_t {
3700         type_t           *type;
3701         ir_initializer_t *initializer;
3702         size_t            index;
3703         entity_t         *compound_entry;
3704 };
3705
3706 typedef struct type_path_t type_path_t;
3707 struct type_path_t {
3708         type_path_entry_t *path;
3709         type_t            *top_type;
3710         bool               invalid;
3711 };
3712
3713 static __attribute__((unused)) void debug_print_type_path(const type_path_t *path)
3714 {
3715         size_t len = ARR_LEN(path->path);
3716
3717         for (size_t i = 0; i < len; ++i) {
3718                 const type_path_entry_t *entry = & path->path[i];
3719
3720                 type_t *type = skip_typeref(entry->type);
3721                 if (is_type_compound(type)) {
3722                         fprintf(stderr, ".%s", entry->compound_entry->base.symbol->string);
3723                 } else if (is_type_array(type)) {
3724                         fprintf(stderr, "[%u]", (unsigned) entry->index);
3725                 } else {
3726                         fprintf(stderr, "-INVALID-");
3727                 }
3728         }
3729         fprintf(stderr, "  (");
3730         print_type(path->top_type);
3731         fprintf(stderr, ")");
3732 }
3733
3734 static type_path_entry_t *get_type_path_top(const type_path_t *path)
3735 {
3736         size_t len = ARR_LEN(path->path);
3737         assert(len > 0);
3738         return & path->path[len-1];
3739 }
3740
3741 static type_path_entry_t *append_to_type_path(type_path_t *path)
3742 {
3743         size_t len = ARR_LEN(path->path);
3744         ARR_RESIZE(type_path_entry_t, path->path, len+1);
3745
3746         type_path_entry_t *result = & path->path[len];
3747         memset(result, 0, sizeof(result[0]));
3748         return result;
3749 }
3750
3751 static size_t get_compound_member_count(const compound_type_t *type)
3752 {
3753         compound_t *compound  = type->compound;
3754         size_t      n_members = 0;
3755         entity_t   *member    = compound->members.entities;
3756         for ( ; member != NULL; member = member->base.next) {
3757                 ++n_members;
3758         }
3759
3760         return n_members;
3761 }
3762
3763 static ir_initializer_t *get_initializer_entry(type_path_t *path)
3764 {
3765         type_t *orig_top_type = path->top_type;
3766         type_t *top_type      = skip_typeref(orig_top_type);
3767
3768         assert(is_type_compound(top_type) || is_type_array(top_type));
3769
3770         if (ARR_LEN(path->path) == 0) {
3771                 return NULL;
3772         } else {
3773                 type_path_entry_t *top         = get_type_path_top(path);
3774                 ir_initializer_t  *initializer = top->initializer;
3775                 return get_initializer_compound_value(initializer, top->index);
3776         }
3777 }
3778
3779 static void descend_into_subtype(type_path_t *path)
3780 {
3781         type_t *orig_top_type = path->top_type;
3782         type_t *top_type      = skip_typeref(orig_top_type);
3783
3784         assert(is_type_compound(top_type) || is_type_array(top_type));
3785
3786         ir_initializer_t *initializer = get_initializer_entry(path);
3787
3788         type_path_entry_t *top = append_to_type_path(path);
3789         top->type              = top_type;
3790
3791         size_t len;
3792
3793         if (is_type_compound(top_type)) {
3794                 compound_t *const compound = top_type->compound.compound;
3795                 entity_t   *const entry    = skip_unnamed_bitfields(compound->members.entities);
3796
3797                 top->compound_entry = entry;
3798                 top->index          = 0;
3799                 len                 = get_compound_member_count(&top_type->compound);
3800                 if (entry != NULL) {
3801                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3802                         path->top_type = entry->declaration.type;
3803                 }
3804         } else {
3805                 assert(is_type_array(top_type));
3806                 assert(top_type->array.size > 0);
3807
3808                 top->index     = 0;
3809                 path->top_type = top_type->array.element_type;
3810                 len            = top_type->array.size;
3811         }
3812         if (initializer == NULL
3813                         || get_initializer_kind(initializer) == IR_INITIALIZER_NULL) {
3814                 initializer = create_initializer_compound(len);
3815                 /* we have to set the entry at the 2nd latest path entry... */
3816                 size_t path_len = ARR_LEN(path->path);
3817                 assert(path_len >= 1);
3818                 if (path_len > 1) {
3819                         type_path_entry_t *entry        = & path->path[path_len-2];
3820                         ir_initializer_t  *tinitializer = entry->initializer;
3821                         set_initializer_compound_value(tinitializer, entry->index,
3822                                                        initializer);
3823                 }
3824         }
3825         top->initializer = initializer;
3826 }
3827
3828 static void ascend_from_subtype(type_path_t *path)
3829 {
3830         type_path_entry_t *top = get_type_path_top(path);
3831
3832         path->top_type = top->type;
3833
3834         size_t len = ARR_LEN(path->path);
3835         ARR_RESIZE(type_path_entry_t, path->path, len-1);
3836 }
3837
3838 static void walk_designator(type_path_t *path, const designator_t *designator)
3839 {
3840         /* designators start at current object type */
3841         ARR_RESIZE(type_path_entry_t, path->path, 1);
3842
3843         for ( ; designator != NULL; designator = designator->next) {
3844                 type_path_entry_t *top         = get_type_path_top(path);
3845                 type_t            *orig_type   = top->type;
3846                 type_t            *type        = skip_typeref(orig_type);
3847
3848                 if (designator->symbol != NULL) {
3849                         assert(is_type_compound(type));
3850                         size_t    index  = 0;
3851                         symbol_t *symbol = designator->symbol;
3852
3853                         compound_t *compound = type->compound.compound;
3854                         entity_t   *iter     = compound->members.entities;
3855                         for ( ; iter != NULL; iter = iter->base.next, ++index) {
3856                                 if (iter->base.symbol == symbol) {
3857                                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
3858                                         break;
3859                                 }
3860                         }
3861                         assert(iter != NULL);
3862
3863                         /* revert previous initialisations of other union elements */
3864                         if (type->kind == TYPE_COMPOUND_UNION) {
3865                                 ir_initializer_t *initializer = top->initializer;
3866                                 if (initializer != NULL
3867                                         && get_initializer_kind(initializer) == IR_INITIALIZER_COMPOUND) {
3868                                         /* are we writing to a new element? */
3869                                         ir_initializer_t *oldi
3870                                                 = get_initializer_compound_value(initializer, index);
3871                                         if (get_initializer_kind(oldi) == IR_INITIALIZER_NULL) {
3872                                                 /* clear initializer */
3873                                                 size_t len
3874                                                         = get_initializer_compound_n_entries(initializer);
3875                                                 ir_initializer_t *nulli = get_initializer_null();
3876                                                 for (size_t i = 0; i < len; ++i) {
3877                                                         set_initializer_compound_value(initializer, i,
3878                                                                                        nulli);
3879                                                 }
3880                                         }
3881                                 }
3882                         }
3883
3884                         top->type           = orig_type;
3885                         top->compound_entry = iter;
3886                         top->index          = index;
3887                         orig_type           = iter->declaration.type;
3888                 } else {
3889                         expression_t *array_index = designator->array_index;
3890                         assert(designator->array_index != NULL);
3891                         assert(is_type_array(type));
3892
3893                         long index = fold_constant_to_int(array_index);
3894                         assert(index >= 0);
3895 #ifndef NDEBUG
3896                         if (type->array.size_constant) {
3897                                 long array_size = type->array.size;
3898                                 assert(index < array_size);
3899                         }
3900 #endif
3901
3902                         top->type  = orig_type;
3903                         top->index = (size_t) index;
3904                         orig_type  = type->array.element_type;
3905                 }
3906                 path->top_type = orig_type;
3907
3908                 if (designator->next != NULL) {
3909                         descend_into_subtype(path);
3910                 }
3911         }
3912
3913         path->invalid  = false;
3914 }
3915
3916 static void advance_current_object(type_path_t *path)
3917 {
3918         if (path->invalid) {
3919                 /* TODO: handle this... */
3920                 panic("invalid initializer in ast2firm (excessive elements)");
3921         }
3922
3923         type_path_entry_t *top = get_type_path_top(path);
3924
3925         type_t *type = skip_typeref(top->type);
3926         if (is_type_union(type)) {
3927                 /* only the first element is initialized in unions */
3928                 top->compound_entry = NULL;
3929         } else if (is_type_struct(type)) {
3930                 entity_t *entry = top->compound_entry;
3931
3932                 top->index++;
3933                 entry               = skip_unnamed_bitfields(entry->base.next);
3934                 top->compound_entry = entry;
3935                 if (entry != NULL) {
3936                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3937                         path->top_type = entry->declaration.type;
3938                         return;
3939                 }
3940         } else {
3941                 assert(is_type_array(type));
3942
3943                 top->index++;
3944                 if (!type->array.size_constant || top->index < type->array.size) {
3945                         return;
3946                 }
3947         }
3948
3949         /* we're past the last member of the current sub-aggregate, try if we
3950          * can ascend in the type hierarchy and continue with another subobject */
3951         size_t len = ARR_LEN(path->path);
3952
3953         if (len > 1) {
3954                 ascend_from_subtype(path);
3955                 advance_current_object(path);
3956         } else {
3957                 path->invalid = true;
3958         }
3959 }
3960
3961
3962 static ir_initializer_t *create_ir_initializer_value(
3963                 const initializer_value_t *initializer)
3964 {
3965         if (is_type_compound(initializer->value->base.type)) {
3966                 panic("initializer creation for compounds not implemented yet");
3967         }
3968         type_t       *type = initializer->value->base.type;
3969         expression_t *expr = initializer->value;
3970         ir_node *value = expression_to_firm(expr);
3971         ir_mode *mode  = get_ir_mode_storage(type);
3972         value          = create_conv(NULL, value, mode);
3973         return create_initializer_const(value);
3974 }
3975
3976 /** test wether type can be initialized by a string constant */
3977 static bool is_string_type(type_t *type)
3978 {
3979         type_t *inner;
3980         if (is_type_pointer(type)) {
3981                 inner = skip_typeref(type->pointer.points_to);
3982         } else if(is_type_array(type)) {
3983                 inner = skip_typeref(type->array.element_type);
3984         } else {
3985                 return false;
3986         }
3987
3988         return is_type_integer(inner);
3989 }
3990
3991 static ir_initializer_t *create_ir_initializer_list(
3992                 const initializer_list_t *initializer, type_t *type)
3993 {
3994         type_path_t path;
3995         memset(&path, 0, sizeof(path));
3996         path.top_type = type;
3997         path.path     = NEW_ARR_F(type_path_entry_t, 0);
3998
3999         descend_into_subtype(&path);
4000
4001         for (size_t i = 0; i < initializer->len; ++i) {
4002                 const initializer_t *sub_initializer = initializer->initializers[i];
4003
4004                 if (sub_initializer->kind == INITIALIZER_DESIGNATOR) {
4005                         walk_designator(&path, sub_initializer->designator.designator);
4006                         continue;
4007                 }
4008
4009                 if (sub_initializer->kind == INITIALIZER_VALUE) {
4010                         /* we might have to descend into types until we're at a scalar
4011                          * type */
4012                         while(true) {
4013                                 type_t *orig_top_type = path.top_type;
4014                                 type_t *top_type      = skip_typeref(orig_top_type);
4015
4016                                 if (is_type_scalar(top_type))
4017                                         break;
4018                                 descend_into_subtype(&path);
4019                         }
4020                 } else if (sub_initializer->kind == INITIALIZER_STRING
4021                                 || sub_initializer->kind == INITIALIZER_WIDE_STRING) {
4022                         /* we might have to descend into types until we're at a scalar
4023                          * type */
4024                         while (true) {
4025                                 type_t *orig_top_type = path.top_type;
4026                                 type_t *top_type      = skip_typeref(orig_top_type);
4027
4028                                 if (is_string_type(top_type))
4029                                         break;
4030                                 descend_into_subtype(&path);
4031                         }
4032                 }
4033
4034                 ir_initializer_t *sub_irinitializer
4035                         = create_ir_initializer(sub_initializer, path.top_type);
4036
4037                 size_t path_len = ARR_LEN(path.path);
4038                 assert(path_len >= 1);
4039                 type_path_entry_t *entry        = & path.path[path_len-1];
4040                 ir_initializer_t  *tinitializer = entry->initializer;
4041                 set_initializer_compound_value(tinitializer, entry->index,
4042                                                sub_irinitializer);
4043
4044                 advance_current_object(&path);
4045         }
4046
4047         assert(ARR_LEN(path.path) >= 1);
4048         ir_initializer_t *result = path.path[0].initializer;
4049         DEL_ARR_F(path.path);
4050
4051         return result;
4052 }
4053
4054 static ir_initializer_t *create_ir_initializer_string(
4055                 const initializer_string_t *initializer, type_t *type)
4056 {
4057         type = skip_typeref(type);
4058
4059         size_t            string_len    = initializer->string.size;
4060         assert(type->kind == TYPE_ARRAY);
4061         assert(type->array.size_constant);
4062         size_t            len           = type->array.size;
4063         ir_initializer_t *irinitializer = create_initializer_compound(len);
4064
4065         const char *string = initializer->string.begin;
4066         ir_mode    *mode   = get_ir_mode_storage(type->array.element_type);
4067
4068         for (size_t i = 0; i < len; ++i) {
4069                 char c = 0;
4070                 if (i < string_len)
4071                         c = string[i];
4072
4073                 ir_tarval        *tv = new_tarval_from_long(c, mode);
4074                 ir_initializer_t *char_initializer = create_initializer_tarval(tv);
4075
4076                 set_initializer_compound_value(irinitializer, i, char_initializer);
4077         }
4078
4079         return irinitializer;
4080 }
4081
4082 static ir_initializer_t *create_ir_initializer_wide_string(
4083                 const initializer_wide_string_t *initializer, type_t *type)
4084 {
4085         assert(type->kind == TYPE_ARRAY);
4086         assert(type->array.size_constant);
4087         size_t            len           = type->array.size;
4088         size_t            string_len    = wstrlen(&initializer->string);
4089         ir_initializer_t *irinitializer = create_initializer_compound(len);
4090
4091         const char *p    = initializer->string.begin;
4092         ir_mode    *mode = get_type_mode(ir_type_wchar_t);
4093
4094         for (size_t i = 0; i < len; ++i) {
4095                 utf32 c = 0;
4096                 if (i < string_len) {
4097                         c = read_utf8_char(&p);
4098                 }
4099                 ir_tarval *tv = new_tarval_from_long(c, mode);
4100                 ir_initializer_t *char_initializer = create_initializer_tarval(tv);
4101
4102                 set_initializer_compound_value(irinitializer, i, char_initializer);
4103         }
4104
4105         return irinitializer;
4106 }
4107
4108 static ir_initializer_t *create_ir_initializer(
4109                 const initializer_t *initializer, type_t *type)
4110 {
4111         switch(initializer->kind) {
4112                 case INITIALIZER_STRING:
4113                         return create_ir_initializer_string(&initializer->string, type);
4114
4115                 case INITIALIZER_WIDE_STRING:
4116                         return create_ir_initializer_wide_string(&initializer->wide_string,
4117                                                                  type);
4118
4119                 case INITIALIZER_LIST:
4120                         return create_ir_initializer_list(&initializer->list, type);
4121
4122                 case INITIALIZER_VALUE:
4123                         return create_ir_initializer_value(&initializer->value);
4124
4125                 case INITIALIZER_DESIGNATOR:
4126                         panic("unexpected designator initializer found");
4127         }
4128         panic("unknown initializer");
4129 }
4130
4131 /** ANSI C §6.7.8:21: If there are fewer initializers [..] than there
4132  *  are elements [...] the remainder of the aggregate shall be initialized
4133  *  implicitly the same as objects that have static storage duration. */
4134 static void create_dynamic_null_initializer(ir_entity *entity, dbg_info *dbgi,
4135                 ir_node *base_addr)
4136 {
4137         /* for unions we must NOT do anything for null initializers */
4138         ir_type *owner = get_entity_owner(entity);
4139         if (is_Union_type(owner)) {
4140                 return;
4141         }
4142
4143         ir_type *ent_type = get_entity_type(entity);
4144         /* create sub-initializers for a compound type */
4145         if (is_compound_type(ent_type)) {
4146                 unsigned n_members = get_compound_n_members(ent_type);
4147                 for (unsigned n = 0; n < n_members; ++n) {
4148                         ir_entity *member = get_compound_member(ent_type, n);
4149                         ir_node   *addr   = new_d_simpleSel(dbgi, new_NoMem(), base_addr,
4150                                                                 member);
4151                         create_dynamic_null_initializer(member, dbgi, addr);
4152                 }
4153                 return;
4154         }
4155         if (is_Array_type(ent_type)) {
4156                 assert(has_array_upper_bound(ent_type, 0));
4157                 long n = get_array_upper_bound_int(ent_type, 0);
4158                 for (long i = 0; i < n; ++i) {
4159                         ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
4160                         ir_tarval *index_tv = new_tarval_from_long(i, mode_uint);
4161                         ir_node   *cnst     = new_d_Const(dbgi, index_tv);
4162                         ir_node   *in[1]    = { cnst };
4163                         ir_entity *arrent   = get_array_element_entity(ent_type);
4164                         ir_node   *addr     = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in,
4165                                                         arrent);
4166                         create_dynamic_null_initializer(arrent, dbgi, addr);
4167                 }
4168                 return;
4169         }
4170
4171         ir_mode *value_mode = get_type_mode(ent_type);
4172         ir_node *node       = new_Const(get_mode_null(value_mode));
4173
4174         /* is it a bitfield type? */
4175         if (is_Primitive_type(ent_type) &&
4176                         get_primitive_base_type(ent_type) != NULL) {
4177                 bitfield_store_to_firm(dbgi, entity, base_addr, node, false, false);
4178                 return;
4179         }
4180
4181         ir_node *mem    = get_store();
4182         ir_node *store  = new_d_Store(dbgi, mem, base_addr, node, cons_none);
4183         ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4184         set_store(proj_m);
4185 }
4186
4187 static void create_dynamic_initializer_sub(ir_initializer_t *initializer,
4188                 ir_entity *entity, ir_type *type, dbg_info *dbgi, ir_node *base_addr)
4189 {
4190         switch(get_initializer_kind(initializer)) {
4191         case IR_INITIALIZER_NULL:
4192                 create_dynamic_null_initializer(entity, dbgi, base_addr);
4193                 return;
4194         case IR_INITIALIZER_CONST: {
4195                 ir_node *node     = get_initializer_const_value(initializer);
4196                 ir_type *ent_type = get_entity_type(entity);
4197
4198                 /* is it a bitfield type? */
4199                 if (is_Primitive_type(ent_type) &&
4200                                 get_primitive_base_type(ent_type) != NULL) {
4201                         bitfield_store_to_firm(dbgi, entity, base_addr, node, false, false);
4202                         return;
4203                 }
4204
4205                 assert(get_type_mode(type) == get_irn_mode(node));
4206                 ir_node *mem    = get_store();
4207                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, node, cons_none);
4208                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4209                 set_store(proj_m);
4210                 return;
4211         }
4212         case IR_INITIALIZER_TARVAL: {
4213                 ir_tarval *tv       = get_initializer_tarval_value(initializer);
4214                 ir_node   *cnst     = new_d_Const(dbgi, tv);
4215                 ir_type   *ent_type = get_entity_type(entity);
4216
4217                 /* is it a bitfield type? */
4218                 if (is_Primitive_type(ent_type) &&
4219                                 get_primitive_base_type(ent_type) != NULL) {
4220                         bitfield_store_to_firm(dbgi, entity, base_addr, cnst, false, false);
4221                         return;
4222                 }
4223
4224                 assert(get_type_mode(type) == get_tarval_mode(tv));
4225                 ir_node *mem    = get_store();
4226                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, cnst, cons_none);
4227                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4228                 set_store(proj_m);
4229                 return;
4230         }
4231         case IR_INITIALIZER_COMPOUND: {
4232                 assert(is_compound_type(type) || is_Array_type(type));
4233                 int n_members;
4234                 if (is_Array_type(type)) {
4235                         assert(has_array_upper_bound(type, 0));
4236                         n_members = get_array_upper_bound_int(type, 0);
4237                 } else {
4238                         n_members = get_compound_n_members(type);
4239                 }
4240
4241                 if (get_initializer_compound_n_entries(initializer)
4242                                 != (unsigned) n_members)
4243                         panic("initializer doesn't match compound type");
4244
4245                 for (int i = 0; i < n_members; ++i) {
4246                         ir_node   *addr;
4247                         ir_type   *irtype;
4248                         ir_entity *sub_entity;
4249                         if (is_Array_type(type)) {
4250                                 ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
4251                                 ir_tarval *index_tv = new_tarval_from_long(i, mode_uint);
4252                                 ir_node   *cnst     = new_d_Const(dbgi, index_tv);
4253                                 ir_node   *in[1]    = { cnst };
4254                                 irtype     = get_array_element_type(type);
4255                                 sub_entity = get_array_element_entity(type);
4256                                 addr       = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in,
4257                                                        sub_entity);
4258                         } else {
4259                                 sub_entity = get_compound_member(type, i);
4260                                 irtype     = get_entity_type(sub_entity);
4261                                 addr       = new_d_simpleSel(dbgi, new_NoMem(), base_addr,
4262                                                              sub_entity);
4263                         }
4264
4265                         ir_initializer_t *sub_init
4266                                 = get_initializer_compound_value(initializer, i);
4267
4268                         create_dynamic_initializer_sub(sub_init, sub_entity, irtype, dbgi,
4269                                                        addr);
4270                 }
4271                 return;
4272         }
4273         }
4274
4275         panic("invalid IR_INITIALIZER found");
4276 }
4277
4278 static void create_dynamic_initializer(ir_initializer_t *initializer,
4279                 dbg_info *dbgi, ir_entity *entity)
4280 {
4281         ir_node *frame     = get_irg_frame(current_ir_graph);
4282         ir_node *base_addr = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
4283         ir_type *type      = get_entity_type(entity);
4284
4285         create_dynamic_initializer_sub(initializer, entity, type, dbgi, base_addr);
4286 }
4287
4288 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
4289                                      ir_entity *entity, type_t *type)
4290 {
4291         ir_node *memory = get_store();
4292         ir_node *nomem  = new_NoMem();
4293         ir_node *frame  = get_irg_frame(current_ir_graph);
4294         ir_node *addr   = new_d_simpleSel(dbgi, nomem, frame, entity);
4295
4296         if (initializer->kind == INITIALIZER_VALUE) {
4297                 initializer_value_t *initializer_value = &initializer->value;
4298
4299                 ir_node *value = expression_to_firm(initializer_value->value);
4300                 type = skip_typeref(type);
4301                 assign_value(dbgi, addr, type, value);
4302                 return;
4303         }
4304
4305         if (is_constant_initializer(initializer) == EXPR_CLASS_VARIABLE) {
4306                 ir_initializer_t *irinitializer
4307                         = create_ir_initializer(initializer, type);
4308
4309                 create_dynamic_initializer(irinitializer, dbgi, entity);
4310                 return;
4311         }
4312
4313         /* create a "template" entity which is copied to the entity on the stack */
4314         ir_entity *const init_entity
4315                 = create_initializer_entity(dbgi, initializer, type);
4316         ir_node *const src_addr = create_symconst(dbgi, init_entity);
4317         ir_type *const irtype   = get_ir_type(type);
4318         ir_node *const copyb    = new_d_CopyB(dbgi, memory, addr, src_addr, irtype);
4319
4320         ir_node *const copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
4321         set_store(copyb_mem);
4322 }
4323
4324 static void create_initializer_local_variable_entity(entity_t *entity)
4325 {
4326         assert(entity->kind == ENTITY_VARIABLE);
4327         initializer_t *initializer = entity->variable.initializer;
4328         dbg_info      *dbgi        = get_dbg_info(&entity->base.source_position);
4329         ir_entity     *irentity    = entity->variable.v.entity;
4330         type_t        *type        = entity->declaration.type;
4331
4332         create_local_initializer(initializer, dbgi, irentity, type);
4333 }
4334
4335 static void create_variable_initializer(entity_t *entity)
4336 {
4337         assert(entity->kind == ENTITY_VARIABLE);
4338         initializer_t *initializer = entity->variable.initializer;
4339         if (initializer == NULL)
4340                 return;
4341
4342         declaration_kind_t declaration_kind
4343                 = (declaration_kind_t) entity->declaration.kind;
4344         if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY) {
4345                 create_initializer_local_variable_entity(entity);
4346                 return;
4347         }
4348
4349         type_t            *type = entity->declaration.type;
4350         type_qualifiers_t  tq   = get_type_qualifier(type, true);
4351
4352         if (initializer->kind == INITIALIZER_VALUE) {
4353                 initializer_value_t *initializer_value = &initializer->value;
4354                 dbg_info            *dbgi = get_dbg_info(&entity->base.source_position);
4355                 expression_t        *value     = initializer_value->value;
4356                 type_t              *init_type = value->base.type;
4357                 type_t              *skipped   = skip_typeref(init_type);
4358
4359                 if (!is_type_scalar(skipped)) {
4360                         /* skip convs */
4361                         while (value->kind == EXPR_UNARY_CAST)
4362                                 value = value->unary.value;
4363
4364                         if (value->kind != EXPR_COMPOUND_LITERAL)
4365                                 panic("expected non-scalar initializer to be a compound literal");
4366                         initializer = value->compound_literal.initializer;
4367                         goto have_initializer;
4368                 }
4369
4370                 ir_node *node = expression_to_firm(initializer_value->value);
4371
4372                 ir_mode *mode      = get_ir_mode_storage(init_type);
4373                 node = create_conv(dbgi, node, mode);
4374                 node = do_strict_conv(dbgi, node);
4375
4376                 if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE) {
4377                         set_value(entity->variable.v.value_number, node);
4378                 } else {
4379                         assert(declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4380
4381                         ir_entity *irentity = entity->variable.v.entity;
4382
4383                         if (tq & TYPE_QUALIFIER_CONST
4384                                         && get_entity_owner(irentity) != get_tls_type()) {
4385                                 add_entity_linkage(irentity, IR_LINKAGE_CONSTANT);
4386                         }
4387                         set_atomic_ent_value(irentity, node);
4388                 }
4389         } else {
4390 have_initializer:
4391                 assert(declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY ||
4392                        declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4393
4394                 ir_entity        *irentity        = entity->variable.v.entity;
4395                 ir_initializer_t *irinitializer
4396                         = create_ir_initializer(initializer, type);
4397
4398                 if (tq & TYPE_QUALIFIER_CONST) {
4399                         add_entity_linkage(irentity, IR_LINKAGE_CONSTANT);
4400                 }
4401                 set_entity_initializer(irentity, irinitializer);
4402         }
4403 }
4404
4405 static void create_variable_length_array(entity_t *entity)
4406 {
4407         assert(entity->kind == ENTITY_VARIABLE);
4408         assert(entity->variable.initializer == NULL);
4409
4410         entity->declaration.kind    = DECLARATION_KIND_VARIABLE_LENGTH_ARRAY;
4411         entity->variable.v.vla_base = NULL;
4412
4413         /* TODO: record VLA somewhere so we create the free node when we leave
4414          * it's scope */
4415 }
4416
4417 static void allocate_variable_length_array(entity_t *entity)
4418 {
4419         assert(entity->kind == ENTITY_VARIABLE);
4420         assert(entity->variable.initializer == NULL);
4421         assert(currently_reachable());
4422
4423         dbg_info *dbgi      = get_dbg_info(&entity->base.source_position);
4424         type_t   *type      = entity->declaration.type;
4425         ir_type  *el_type   = get_ir_type(type->array.element_type);
4426
4427         /* make sure size_node is calculated */
4428         get_type_size_node(type);
4429         ir_node  *elems = type->array.size_node;
4430         ir_node  *mem   = get_store();
4431         ir_node  *alloc = new_d_Alloc(dbgi, mem, elems, el_type, stack_alloc);
4432
4433         ir_node  *proj_m = new_d_Proj(dbgi, alloc, mode_M, pn_Alloc_M);
4434         ir_node  *addr   = new_d_Proj(dbgi, alloc, mode_P_data, pn_Alloc_res);
4435         set_store(proj_m);
4436
4437         assert(entity->declaration.kind == DECLARATION_KIND_VARIABLE_LENGTH_ARRAY);
4438         entity->variable.v.vla_base = addr;
4439 }
4440
4441 /**
4442  * Creates a Firm local variable from a declaration.
4443  */
4444 static void create_local_variable(entity_t *entity)
4445 {
4446         assert(entity->kind == ENTITY_VARIABLE);
4447         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4448
4449         bool needs_entity = entity->variable.address_taken;
4450         type_t *type = skip_typeref(entity->declaration.type);
4451
4452         /* is it a variable length array? */
4453         if (is_type_array(type) && !type->array.size_constant) {
4454                 create_variable_length_array(entity);
4455                 return;
4456         } else if (is_type_array(type) || is_type_compound(type)) {
4457                 needs_entity = true;
4458         } else if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
4459                 needs_entity = true;
4460         }
4461
4462         if (needs_entity) {
4463                 ir_type *frame_type = get_irg_frame_type(current_ir_graph);
4464                 create_variable_entity(entity,
4465                                        DECLARATION_KIND_LOCAL_VARIABLE_ENTITY,
4466                                        frame_type);
4467         } else {
4468                 entity->declaration.kind        = DECLARATION_KIND_LOCAL_VARIABLE;
4469                 entity->variable.v.value_number = next_value_number_function;
4470                 set_irg_loc_description(current_ir_graph, next_value_number_function,
4471                                         entity);
4472                 ++next_value_number_function;
4473         }
4474 }
4475
4476 static void create_local_static_variable(entity_t *entity)
4477 {
4478         assert(entity->kind == ENTITY_VARIABLE);
4479         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4480
4481         type_t   *type           = skip_typeref(entity->declaration.type);
4482         ir_type  *const var_type = entity->variable.thread_local ?
4483                 get_tls_type() : get_glob_type();
4484         ir_type  *const irtype   = get_ir_type(type);
4485         dbg_info *const dbgi     = get_dbg_info(&entity->base.source_position);
4486
4487         size_t l = strlen(entity->base.symbol->string);
4488         char   buf[l + sizeof(".%u")];
4489         snprintf(buf, sizeof(buf), "%s.%%u", entity->base.symbol->string);
4490         ident     *const id       = id_unique(buf);
4491         ir_entity *const irentity = new_d_entity(var_type, id, irtype, dbgi);
4492
4493         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
4494                 set_entity_volatility(irentity, volatility_is_volatile);
4495         }
4496
4497         entity->declaration.kind  = DECLARATION_KIND_GLOBAL_VARIABLE;
4498         entity->variable.v.entity = irentity;
4499
4500         set_entity_ld_ident(irentity, id);
4501         set_entity_visibility(irentity, ir_visibility_local);
4502
4503         ir_graph *const old_current_ir_graph = current_ir_graph;
4504         current_ir_graph = get_const_code_irg();
4505
4506         create_variable_initializer(entity);
4507
4508         assert(current_ir_graph == get_const_code_irg());
4509         current_ir_graph = old_current_ir_graph;
4510 }
4511
4512
4513
4514 static void return_statement_to_firm(return_statement_t *statement)
4515 {
4516         if (!currently_reachable())
4517                 return;
4518
4519         dbg_info *dbgi        = get_dbg_info(&statement->base.source_position);
4520         type_t   *type        = current_function_entity->declaration.type;
4521         ir_type  *func_irtype = get_ir_type(type);
4522
4523         ir_node *in[1];
4524         int      in_len;
4525         if (get_method_n_ress(func_irtype) > 0) {
4526                 ir_type *res_type = get_method_res_type(func_irtype, 0);
4527
4528                 if (statement->value != NULL) {
4529                         ir_node *node = expression_to_firm(statement->value);
4530                         if (!is_compound_type(res_type)) {
4531                                 type_t  *ret_value_type = statement->value->base.type;
4532                                 ir_mode *mode           = get_ir_mode_storage(ret_value_type);
4533                                 node                    = create_conv(dbgi, node, mode);
4534                                 node                    = do_strict_conv(dbgi, node);
4535                         }
4536                         in[0] = node;
4537                 } else {
4538                         ir_mode *mode;
4539                         if (is_compound_type(res_type)) {
4540                                 mode = mode_P_data;
4541                         } else {
4542                                 mode = get_type_mode(res_type);
4543                         }
4544                         in[0] = new_Unknown(mode);
4545                 }
4546                 in_len = 1;
4547         } else {
4548                 /* build return_value for its side effects */
4549                 if (statement->value != NULL) {
4550                         expression_to_firm(statement->value);
4551                 }
4552                 in_len = 0;
4553         }
4554
4555         ir_node  *store = get_store();
4556         ir_node  *ret   = new_d_Return(dbgi, store, in_len, in);
4557
4558         ir_node *end_block = get_irg_end_block(current_ir_graph);
4559         add_immBlock_pred(end_block, ret);
4560
4561         set_unreachable_now();
4562 }
4563
4564 static ir_node *expression_statement_to_firm(expression_statement_t *statement)
4565 {
4566         if (!currently_reachable())
4567                 return NULL;
4568
4569         return expression_to_firm(statement->expression);
4570 }
4571
4572 static ir_node *compound_statement_to_firm(compound_statement_t *compound)
4573 {
4574         entity_t *entity = compound->scope.entities;
4575         for ( ; entity != NULL; entity = entity->base.next) {
4576                 if (!is_declaration(entity))
4577                         continue;
4578
4579                 create_local_declaration(entity);
4580         }
4581
4582         ir_node     *result    = NULL;
4583         statement_t *statement = compound->statements;
4584         for ( ; statement != NULL; statement = statement->base.next) {
4585                 if (statement->base.next == NULL
4586                                 && statement->kind == STATEMENT_EXPRESSION) {
4587                         result = expression_statement_to_firm(
4588                                         &statement->expression);
4589                         break;
4590                 }
4591                 statement_to_firm(statement);
4592         }
4593
4594         return result;
4595 }
4596
4597 static void create_global_variable(entity_t *entity)
4598 {
4599         ir_linkage    linkage    = IR_LINKAGE_DEFAULT;
4600         ir_visibility visibility = ir_visibility_default;
4601         ir_entity    *irentity;
4602         assert(entity->kind == ENTITY_VARIABLE);
4603
4604         switch ((storage_class_tag_t)entity->declaration.storage_class) {
4605         case STORAGE_CLASS_EXTERN: visibility = ir_visibility_external; break;
4606         case STORAGE_CLASS_STATIC: visibility = ir_visibility_local;    break;
4607         case STORAGE_CLASS_NONE:
4608                 visibility = ir_visibility_default;
4609                 /* uninitialized globals get merged in C */
4610                 if (entity->variable.initializer == NULL)
4611                         linkage |= IR_LINKAGE_MERGE;
4612                 break;
4613         case STORAGE_CLASS_TYPEDEF:
4614         case STORAGE_CLASS_AUTO:
4615         case STORAGE_CLASS_REGISTER:
4616                 panic("invalid storage class for global var");
4617         }
4618
4619         ir_type *var_type = get_glob_type();
4620         if (entity->variable.thread_local) {
4621                 var_type = get_tls_type();
4622                 /* LINKAGE_MERGE not supported by current linkers */
4623                 linkage &= ~IR_LINKAGE_MERGE;
4624         }
4625         create_variable_entity(entity, DECLARATION_KIND_GLOBAL_VARIABLE, var_type);
4626         irentity = entity->variable.v.entity;
4627         add_entity_linkage(irentity, linkage);
4628         set_entity_visibility(irentity, visibility);
4629 }
4630
4631 static void create_local_declaration(entity_t *entity)
4632 {
4633         assert(is_declaration(entity));
4634
4635         /* construct type */
4636         (void) get_ir_type(entity->declaration.type);
4637         if (entity->base.symbol == NULL) {
4638                 return;
4639         }
4640
4641         switch ((storage_class_tag_t) entity->declaration.storage_class) {
4642         case STORAGE_CLASS_STATIC:
4643                 if (entity->kind == ENTITY_FUNCTION) {
4644                         (void)get_function_entity(entity, NULL);
4645                 } else {
4646                         create_local_static_variable(entity);
4647                 }
4648                 return;
4649         case STORAGE_CLASS_EXTERN:
4650                 if (entity->kind == ENTITY_FUNCTION) {
4651                         assert(entity->function.statement == NULL);
4652                         (void)get_function_entity(entity, NULL);
4653                 } else {
4654                         create_global_variable(entity);
4655                         create_variable_initializer(entity);
4656                 }
4657                 return;
4658         case STORAGE_CLASS_NONE:
4659         case STORAGE_CLASS_AUTO:
4660         case STORAGE_CLASS_REGISTER:
4661                 if (entity->kind == ENTITY_FUNCTION) {
4662                         if (entity->function.statement != NULL) {
4663                                 ir_type *owner = get_irg_frame_type(current_ir_graph);
4664                                 (void)get_function_entity(entity, owner);
4665                                 entity->declaration.kind = DECLARATION_KIND_INNER_FUNCTION;
4666                                 enqueue_inner_function(entity);
4667                         } else {
4668                                 (void)get_function_entity(entity, NULL);
4669                         }
4670                 } else {
4671                         create_local_variable(entity);
4672                 }
4673                 return;
4674         case STORAGE_CLASS_TYPEDEF:
4675                 break;
4676         }
4677         panic("invalid storage class found");
4678 }
4679
4680 static void initialize_local_declaration(entity_t *entity)
4681 {
4682         if (entity->base.symbol == NULL)
4683                 return;
4684
4685         // no need to emit code in dead blocks
4686         if (entity->declaration.storage_class != STORAGE_CLASS_STATIC
4687                         && !currently_reachable())
4688                 return;
4689
4690         switch ((declaration_kind_t) entity->declaration.kind) {
4691         case DECLARATION_KIND_LOCAL_VARIABLE:
4692         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY:
4693                 create_variable_initializer(entity);
4694                 return;
4695
4696         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
4697                 allocate_variable_length_array(entity);
4698                 return;
4699
4700         case DECLARATION_KIND_COMPOUND_MEMBER:
4701         case DECLARATION_KIND_GLOBAL_VARIABLE:
4702         case DECLARATION_KIND_FUNCTION:
4703         case DECLARATION_KIND_INNER_FUNCTION:
4704                 return;
4705
4706         case DECLARATION_KIND_PARAMETER:
4707         case DECLARATION_KIND_PARAMETER_ENTITY:
4708                 panic("can't initialize parameters");
4709
4710         case DECLARATION_KIND_UNKNOWN:
4711                 panic("can't initialize unknown declaration");
4712         }
4713         panic("invalid declaration kind");
4714 }
4715
4716 static void declaration_statement_to_firm(declaration_statement_t *statement)
4717 {
4718         entity_t *entity = statement->declarations_begin;
4719         if (entity == NULL)
4720                 return;
4721
4722         entity_t *const last = statement->declarations_end;
4723         for ( ;; entity = entity->base.next) {
4724                 if (is_declaration(entity)) {
4725                         initialize_local_declaration(entity);
4726                 } else if (entity->kind == ENTITY_TYPEDEF) {
4727                         /* §6.7.7:3  Any array size expressions associated with variable length
4728                          * array declarators are evaluated each time the declaration of the
4729                          * typedef name is reached in the order of execution. */
4730                         type_t *const type = skip_typeref(entity->typedefe.type);
4731                         if (is_type_array(type) && type->array.is_vla)
4732                                 get_vla_size(&type->array);
4733                 }
4734                 if (entity == last)
4735                         break;
4736         }
4737 }
4738
4739 static void if_statement_to_firm(if_statement_t *statement)
4740 {
4741         /* Create the condition. */
4742         ir_node *true_block  = NULL;
4743         ir_node *false_block = NULL;
4744         if (currently_reachable()) {
4745                 true_block  = new_immBlock();
4746                 false_block = new_immBlock();
4747                 create_condition_evaluation(statement->condition, true_block, false_block);
4748                 mature_immBlock(true_block);
4749                 mature_immBlock(false_block);
4750         }
4751
4752         /* Create the true statement. */
4753         set_cur_block(true_block);
4754         statement_to_firm(statement->true_statement);
4755         ir_node *fallthrough_block = get_cur_block();
4756
4757         /* Create the false statement. */
4758         set_cur_block(false_block);
4759         if (statement->false_statement != NULL) {
4760                 statement_to_firm(statement->false_statement);
4761         }
4762
4763         /* Handle the block after the if-statement.  Minor simplification and
4764          * optimisation: Reuse the false/true block as fallthrough block, if the
4765          * true/false statement does not pass control to the fallthrough block, e.g.
4766          * in the typical if (x) return; pattern. */
4767         if (fallthrough_block) {
4768                 if (currently_reachable()) {
4769                         ir_node *const t_jump = new_r_Jmp(fallthrough_block);
4770                         ir_node *const f_jump = new_Jmp();
4771                         ir_node *const in[]   = { t_jump, f_jump };
4772                         fallthrough_block = new_Block(2, in);
4773                 }
4774                 set_cur_block(fallthrough_block);
4775         }
4776 }
4777
4778 /* Create a jump node which jumps into target_block, if the current block is
4779  * reachable. */
4780 static void jump_if_reachable(ir_node *const target_block)
4781 {
4782         ir_node *const pred = currently_reachable() ? new_Jmp() : new_Bad(mode_X);
4783         add_immBlock_pred(target_block, pred);
4784 }
4785
4786 static void while_statement_to_firm(while_statement_t *statement)
4787 {
4788         /* Create the header block */
4789         ir_node *const header_block = new_immBlock();
4790         jump_if_reachable(header_block);
4791
4792         /* Create the condition. */
4793         ir_node      *      body_block;
4794         ir_node      *      false_block;
4795         expression_t *const cond = statement->condition;
4796         if (is_constant_expression(cond) == EXPR_CLASS_CONSTANT &&
4797                         fold_constant_to_bool(cond)) {
4798                 /* Shortcut for while (true). */
4799                 body_block  = header_block;
4800                 false_block = NULL;
4801
4802                 keep_alive(header_block);
4803                 keep_all_memory(header_block);
4804         } else {
4805                 body_block  = new_immBlock();
4806                 false_block = new_immBlock();
4807
4808                 set_cur_block(header_block);
4809                 create_condition_evaluation(cond, body_block, false_block);
4810                 mature_immBlock(body_block);
4811         }
4812
4813         ir_node *const old_continue_label = continue_label;
4814         ir_node *const old_break_label    = break_label;
4815         continue_label = header_block;
4816         break_label    = false_block;
4817
4818         /* Create the loop body. */
4819         set_cur_block(body_block);
4820         statement_to_firm(statement->body);
4821         jump_if_reachable(header_block);
4822
4823         mature_immBlock(header_block);
4824         assert(false_block == NULL || false_block == break_label);
4825         false_block = break_label;
4826         if (false_block != NULL) {
4827                 mature_immBlock(false_block);
4828         }
4829         set_cur_block(false_block);
4830
4831         assert(continue_label == header_block);
4832         continue_label = old_continue_label;
4833         break_label    = old_break_label;
4834 }
4835
4836 static ir_node *get_break_label(void)
4837 {
4838         if (break_label == NULL) {
4839                 break_label = new_immBlock();
4840         }
4841         return break_label;
4842 }
4843
4844 static void do_while_statement_to_firm(do_while_statement_t *statement)
4845 {
4846         /* create the header block */
4847         ir_node *header_block = new_immBlock();
4848
4849         /* the loop body */
4850         ir_node *body_block = new_immBlock();
4851         jump_if_reachable(body_block);
4852
4853         ir_node *old_continue_label = continue_label;
4854         ir_node *old_break_label    = break_label;
4855         continue_label              = header_block;
4856         break_label                 = NULL;
4857
4858         set_cur_block(body_block);
4859         statement_to_firm(statement->body);
4860         ir_node *const false_block = get_break_label();
4861
4862         assert(continue_label == header_block);
4863         continue_label = old_continue_label;
4864         break_label    = old_break_label;
4865
4866         jump_if_reachable(header_block);
4867
4868         /* create the condition */
4869         mature_immBlock(header_block);
4870         set_cur_block(header_block);
4871
4872         create_condition_evaluation(statement->condition, body_block, false_block);
4873         mature_immBlock(body_block);
4874         mature_immBlock(false_block);
4875
4876         set_cur_block(false_block);
4877 }
4878
4879 static void for_statement_to_firm(for_statement_t *statement)
4880 {
4881         /* create declarations */
4882         entity_t *entity = statement->scope.entities;
4883         for ( ; entity != NULL; entity = entity->base.next) {
4884                 if (!is_declaration(entity))
4885                         continue;
4886
4887                 create_local_declaration(entity);
4888         }
4889
4890         if (currently_reachable()) {
4891                 entity = statement->scope.entities;
4892                 for ( ; entity != NULL; entity = entity->base.next) {
4893                         if (!is_declaration(entity))
4894                                 continue;
4895
4896                         initialize_local_declaration(entity);
4897                 }
4898
4899                 if (statement->initialisation != NULL) {
4900                         expression_to_firm(statement->initialisation);
4901                 }
4902         }
4903
4904         /* Create the header block */
4905         ir_node *const header_block = new_immBlock();
4906         jump_if_reachable(header_block);
4907
4908         /* Create the condition. */
4909         ir_node *body_block;
4910         ir_node *false_block;
4911         if (statement->condition != NULL) {
4912                 body_block  = new_immBlock();
4913                 false_block = new_immBlock();
4914
4915                 set_cur_block(header_block);
4916                 create_condition_evaluation(statement->condition, body_block, false_block);
4917                 mature_immBlock(body_block);
4918         } else {
4919                 /* for-ever. */
4920                 body_block  = header_block;
4921                 false_block = NULL;
4922
4923                 keep_alive(header_block);
4924                 keep_all_memory(header_block);
4925         }
4926
4927         /* Create the step block, if necessary. */
4928         ir_node      *      step_block = header_block;
4929         expression_t *const step       = statement->step;
4930         if (step != NULL) {
4931                 step_block = new_immBlock();
4932         }
4933
4934         ir_node *const old_continue_label = continue_label;
4935         ir_node *const old_break_label    = break_label;
4936         continue_label = step_block;
4937         break_label    = false_block;
4938
4939         /* Create the loop body. */
4940         set_cur_block(body_block);
4941         statement_to_firm(statement->body);
4942         jump_if_reachable(step_block);
4943
4944         /* Create the step code. */
4945         if (step != NULL) {
4946                 mature_immBlock(step_block);
4947                 set_cur_block(step_block);
4948                 expression_to_firm(step);
4949                 jump_if_reachable(header_block);
4950         }
4951
4952         mature_immBlock(header_block);
4953         assert(false_block == NULL || false_block == break_label);
4954         false_block = break_label;
4955         if (false_block != NULL) {
4956                 mature_immBlock(false_block);
4957         }
4958         set_cur_block(false_block);
4959
4960         assert(continue_label == step_block);
4961         continue_label = old_continue_label;
4962         break_label    = old_break_label;
4963 }
4964
4965 static void create_jump_statement(const statement_t *statement,
4966                                   ir_node *target_block)
4967 {
4968         if (!currently_reachable())
4969                 return;
4970
4971         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
4972         ir_node  *jump = new_d_Jmp(dbgi);
4973         add_immBlock_pred(target_block, jump);
4974
4975         set_unreachable_now();
4976 }
4977
4978 static ir_switch_table *create_switch_table(const switch_statement_t *statement)
4979 {
4980         /* determine number of cases */
4981         size_t n_cases = 0;
4982         for (case_label_statement_t *l = statement->first_case; l != NULL;
4983              l = l->next) {
4984                 /* default case */
4985                 if (l->expression == NULL)
4986                         continue;
4987                 if (l->is_empty_range)
4988                         continue;
4989                 ++n_cases;
4990         }
4991
4992         ir_switch_table *res = ir_new_switch_table(current_ir_graph, n_cases);
4993         size_t           i   = 0;
4994         for (case_label_statement_t *l = statement->first_case; l != NULL;
4995              l = l->next) {
4996             if (l->expression == NULL) {
4997                         l->pn = pn_Switch_default;
4998                         continue;
4999                 }
5000                 if (l->is_empty_range)
5001                         continue;
5002                 ir_tarval *min = fold_constant_to_tarval(l->expression);
5003                 ir_tarval *max = min;
5004                 long       pn  = (long) i+1;
5005                 if (l->end_range != NULL)
5006                         max = fold_constant_to_tarval(l->end_range);
5007                 ir_switch_table_set(res, i++, min, max, pn);
5008                 l->pn = pn;
5009         }
5010         return res;
5011 }
5012
5013 static void switch_statement_to_firm(switch_statement_t *statement)
5014 {
5015         ir_node  *first_block = NULL;
5016         dbg_info *dbgi        = get_dbg_info(&statement->base.source_position);
5017         ir_node  *switch_node = NULL;
5018
5019         if (currently_reachable()) {
5020                 ir_node *expression = expression_to_firm(statement->expression);
5021                 ir_switch_table *table = create_switch_table(statement);
5022                 unsigned n_outs = (unsigned)ir_switch_table_get_n_entries(table) + 1;
5023
5024                 switch_node = new_d_Switch(dbgi, expression, n_outs, table);
5025                 first_block = get_cur_block();
5026         }
5027
5028         set_unreachable_now();
5029
5030         ir_node *const old_switch            = current_switch;
5031         ir_node *const old_break_label       = break_label;
5032         const bool     old_saw_default_label = saw_default_label;
5033         saw_default_label                    = false;
5034         current_switch                       = switch_node;
5035         break_label                          = NULL;
5036
5037         statement_to_firm(statement->body);
5038
5039         jump_if_reachable(get_break_label());
5040
5041         if (!saw_default_label && first_block != NULL) {
5042                 set_cur_block(first_block);
5043                 ir_node *proj = new_d_Proj(dbgi, switch_node, mode_X, pn_Switch_default);
5044                 add_immBlock_pred(get_break_label(), proj);
5045         }
5046
5047         if (break_label != NULL) {
5048                 mature_immBlock(break_label);
5049         }
5050         set_cur_block(break_label);
5051
5052         assert(current_switch == switch_node);
5053         current_switch    = old_switch;
5054         break_label       = old_break_label;
5055         saw_default_label = old_saw_default_label;
5056 }
5057
5058 static void case_label_to_firm(const case_label_statement_t *statement)
5059 {
5060         if (statement->is_empty_range)
5061                 return;
5062
5063         if (current_switch != NULL) {
5064                 ir_node *block = new_immBlock();
5065                 /* Fallthrough from previous case */
5066                 jump_if_reachable(block);
5067
5068                 ir_node  *const proj = new_Proj(current_switch, mode_X, statement->pn);
5069                 add_immBlock_pred(block, proj);
5070                 if (statement->expression == NULL)
5071                         saw_default_label = true;
5072
5073                 mature_immBlock(block);
5074                 set_cur_block(block);
5075         }
5076
5077         statement_to_firm(statement->statement);
5078 }
5079
5080 static void label_to_firm(const label_statement_t *statement)
5081 {
5082         ir_node *block = get_label_block(statement->label);
5083         jump_if_reachable(block);
5084
5085         set_cur_block(block);
5086         keep_alive(block);
5087         keep_all_memory(block);
5088
5089         statement_to_firm(statement->statement);
5090 }
5091
5092 static void computed_goto_to_firm(computed_goto_statement_t const *const statement)
5093 {
5094         if (!currently_reachable())
5095                 return;
5096
5097         ir_node  *const irn  = expression_to_firm(statement->expression);
5098         dbg_info *const dbgi = get_dbg_info(&statement->base.source_position);
5099         ir_node  *const ijmp = new_d_IJmp(dbgi, irn);
5100
5101         set_irn_link(ijmp, ijmp_list);
5102         ijmp_list = ijmp;
5103
5104         set_unreachable_now();
5105 }
5106
5107 static void asm_statement_to_firm(const asm_statement_t *statement)
5108 {
5109         bool needs_memory = false;
5110
5111         if (statement->is_volatile) {
5112                 needs_memory = true;
5113         }
5114
5115         size_t         n_clobbers = 0;
5116         asm_clobber_t *clobber    = statement->clobbers;
5117         for ( ; clobber != NULL; clobber = clobber->next) {
5118                 const char *clobber_str = clobber->clobber.begin;
5119
5120                 if (!be_is_valid_clobber(clobber_str)) {
5121                         errorf(&statement->base.source_position,
5122                                    "invalid clobber '%s' specified", clobber->clobber);
5123                         continue;
5124                 }
5125
5126                 if (streq(clobber_str, "memory")) {
5127                         needs_memory = true;
5128                         continue;
5129                 }
5130
5131                 ident *id = new_id_from_str(clobber_str);
5132                 obstack_ptr_grow(&asm_obst, id);
5133                 ++n_clobbers;
5134         }
5135         assert(obstack_object_size(&asm_obst) == n_clobbers * sizeof(ident*));
5136         ident **clobbers = NULL;
5137         if (n_clobbers > 0) {
5138                 clobbers = obstack_finish(&asm_obst);
5139         }
5140
5141         size_t n_inputs  = 0;
5142         asm_argument_t *argument = statement->inputs;
5143         for ( ; argument != NULL; argument = argument->next)
5144                 n_inputs++;
5145         size_t n_outputs = 0;
5146         argument = statement->outputs;
5147         for ( ; argument != NULL; argument = argument->next)
5148                 n_outputs++;
5149
5150         unsigned next_pos = 0;
5151
5152         ir_node *ins[n_inputs + n_outputs + 1];
5153         size_t   in_size = 0;
5154
5155         ir_asm_constraint tmp_in_constraints[n_outputs];
5156
5157         const expression_t *out_exprs[n_outputs];
5158         ir_node            *out_addrs[n_outputs];
5159         size_t              out_size = 0;
5160
5161         argument = statement->outputs;
5162         for ( ; argument != NULL; argument = argument->next) {
5163                 const char *constraints = argument->constraints.begin;
5164                 asm_constraint_flags_t asm_flags
5165                         = be_parse_asm_constraints(constraints);
5166
5167                 {
5168                         source_position_t const *const pos = &statement->base.source_position;
5169                         if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
5170                                 warningf(WARN_OTHER, pos, "some constraints in '%s' are not supported", constraints);
5171                         }
5172                         if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
5173                                 errorf(pos, "some constraints in '%s' are invalid", constraints);
5174                                 continue;
5175                         }
5176                         if (! (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE)) {
5177                                 errorf(pos, "no write flag specified for output constraints '%s'", constraints);
5178                                 continue;
5179                         }
5180                 }
5181
5182                 unsigned pos = next_pos++;
5183                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
5184                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
5185                         expression_t *expr = argument->expression;
5186                         ir_node      *addr = expression_to_addr(expr);
5187                         /* in+output, construct an artifical same_as constraint on the
5188                          * input */
5189                         if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_READ) {
5190                                 char     buf[64];
5191                                 ir_node *value = get_value_from_lvalue(expr, addr);
5192
5193                                 snprintf(buf, sizeof(buf), "%u", (unsigned) out_size);
5194
5195                                 ir_asm_constraint constraint;
5196                                 constraint.pos              = pos;
5197                                 constraint.constraint       = new_id_from_str(buf);
5198                                 constraint.mode             = get_ir_mode_storage(expr->base.type);
5199                                 tmp_in_constraints[in_size] = constraint;
5200                                 ins[in_size] = value;
5201
5202                                 ++in_size;
5203                         }
5204
5205                         out_exprs[out_size] = expr;
5206                         out_addrs[out_size] = addr;
5207                         ++out_size;
5208                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
5209                         /* pure memory ops need no input (but we have to make sure we
5210                          * attach to the memory) */
5211                         assert(! (asm_flags &
5212                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
5213                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
5214                         needs_memory = true;
5215
5216                         /* we need to attach the address to the inputs */
5217                         expression_t *expr = argument->expression;
5218
5219                         ir_asm_constraint constraint;
5220                         constraint.pos              = pos;
5221                         constraint.constraint       = new_id_from_str(constraints);
5222                         constraint.mode             = mode_M;
5223                         tmp_in_constraints[in_size] = constraint;
5224
5225                         ins[in_size]          = expression_to_addr(expr);
5226                         ++in_size;
5227                         continue;
5228                 } else {
5229                         errorf(&statement->base.source_position,
5230                                "only modifiers but no place set in constraints '%s'",
5231                                constraints);
5232                         continue;
5233                 }
5234
5235                 ir_asm_constraint constraint;
5236                 constraint.pos        = pos;
5237                 constraint.constraint = new_id_from_str(constraints);
5238                 constraint.mode       = get_ir_mode_storage(argument->expression->base.type);
5239
5240                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5241         }
5242         assert(obstack_object_size(&asm_obst)
5243                         == out_size * sizeof(ir_asm_constraint));
5244         ir_asm_constraint *output_constraints = obstack_finish(&asm_obst);
5245
5246
5247         obstack_grow(&asm_obst, tmp_in_constraints,
5248                      in_size * sizeof(tmp_in_constraints[0]));
5249         /* find and count input and output arguments */
5250         argument = statement->inputs;
5251         for ( ; argument != NULL; argument = argument->next) {
5252                 const char *constraints = argument->constraints.begin;
5253                 asm_constraint_flags_t asm_flags
5254                         = be_parse_asm_constraints(constraints);
5255
5256                 if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
5257                         errorf(&statement->base.source_position,
5258                                "some constraints in '%s' are not supported", constraints);
5259                         continue;
5260                 }
5261                 if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
5262                         errorf(&statement->base.source_position,
5263                                "some constraints in '%s' are invalid", constraints);
5264                         continue;
5265                 }
5266                 if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE) {
5267                         errorf(&statement->base.source_position,
5268                                "write flag specified for input constraints '%s'",
5269                                constraints);
5270                         continue;
5271                 }
5272
5273                 ir_node *input;
5274                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
5275                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
5276                         /* we can treat this as "normal" input */
5277                         input = expression_to_firm(argument->expression);
5278                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
5279                         /* pure memory ops need no input (but we have to make sure we
5280                          * attach to the memory) */
5281                         assert(! (asm_flags &
5282                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
5283                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
5284                         needs_memory = true;
5285                         input = expression_to_addr(argument->expression);
5286                 } else {
5287                         errorf(&statement->base.source_position,
5288                                "only modifiers but no place set in constraints '%s'",
5289                                constraints);
5290                         continue;
5291                 }
5292
5293                 ir_asm_constraint constraint;
5294                 constraint.pos        = next_pos++;
5295                 constraint.constraint = new_id_from_str(constraints);
5296                 constraint.mode       = get_irn_mode(input);
5297
5298                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5299                 ins[in_size++] = input;
5300         }
5301
5302         if (needs_memory) {
5303                 ir_asm_constraint constraint;
5304                 constraint.pos        = next_pos++;
5305                 constraint.constraint = new_id_from_str("");
5306                 constraint.mode       = mode_M;
5307
5308                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5309                 ins[in_size++] = get_store();
5310         }
5311
5312         assert(obstack_object_size(&asm_obst)
5313                         == in_size * sizeof(ir_asm_constraint));
5314         ir_asm_constraint *input_constraints = obstack_finish(&asm_obst);
5315
5316         /* create asm node */
5317         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
5318
5319         ident *asm_text = new_id_from_str(statement->asm_text.begin);
5320
5321         ir_node *node = new_d_ASM(dbgi, in_size, ins, input_constraints,
5322                                   out_size, output_constraints,
5323                                   n_clobbers, clobbers, asm_text);
5324
5325         if (statement->is_volatile) {
5326                 set_irn_pinned(node, op_pin_state_pinned);
5327         } else {
5328                 set_irn_pinned(node, op_pin_state_floats);
5329         }
5330
5331         /* create output projs & connect them */
5332         if (needs_memory) {
5333                 ir_node *projm = new_Proj(node, mode_M, out_size);
5334                 set_store(projm);
5335         }
5336
5337         size_t i;
5338         for (i = 0; i < out_size; ++i) {
5339                 const expression_t *out_expr = out_exprs[i];
5340                 long                pn       = i;
5341                 ir_mode            *mode     = get_ir_mode_storage(out_expr->base.type);
5342                 ir_node            *proj     = new_Proj(node, mode, pn);
5343                 ir_node            *addr     = out_addrs[i];
5344
5345                 set_value_for_expression_addr(out_expr, proj, addr);
5346         }
5347 }
5348
5349 static void ms_try_statement_to_firm(ms_try_statement_t *statement)
5350 {
5351         statement_to_firm(statement->try_statement);
5352         source_position_t const *const pos = &statement->base.source_position;
5353         warningf(WARN_OTHER, pos, "structured exception handling ignored");
5354 }
5355
5356 static void leave_statement_to_firm(leave_statement_t *statement)
5357 {
5358         errorf(&statement->base.source_position, "__leave not supported yet");
5359 }
5360
5361 /**
5362  * Transform a statement.
5363  */
5364 static void statement_to_firm(statement_t *const stmt)
5365 {
5366 #ifndef NDEBUG
5367         assert(!stmt->base.transformed);
5368         stmt->base.transformed = true;
5369 #endif
5370
5371         switch (stmt->kind) {
5372         case STATEMENT_ASM:           asm_statement_to_firm(        &stmt->asms);          return;
5373         case STATEMENT_CASE_LABEL:    case_label_to_firm(           &stmt->case_label);    return;
5374         case STATEMENT_COMPOUND:      compound_statement_to_firm(   &stmt->compound);      return;
5375         case STATEMENT_COMPUTED_GOTO: computed_goto_to_firm(        &stmt->computed_goto); return;
5376         case STATEMENT_DECLARATION:   declaration_statement_to_firm(&stmt->declaration);   return;
5377         case STATEMENT_DO_WHILE:      do_while_statement_to_firm(   &stmt->do_while);      return;
5378         case STATEMENT_EMPTY:         /* nothing */                                        return;
5379         case STATEMENT_EXPRESSION:    expression_statement_to_firm( &stmt->expression);    return;
5380         case STATEMENT_FOR:           for_statement_to_firm(        &stmt->fors);          return;
5381         case STATEMENT_IF:            if_statement_to_firm(         &stmt->ifs);           return;
5382         case STATEMENT_LABEL:         label_to_firm(                &stmt->label);         return;
5383         case STATEMENT_LEAVE:         leave_statement_to_firm(      &stmt->leave);         return;
5384         case STATEMENT_MS_TRY:        ms_try_statement_to_firm(     &stmt->ms_try);        return;
5385         case STATEMENT_RETURN:        return_statement_to_firm(     &stmt->returns);       return;
5386         case STATEMENT_SWITCH:        switch_statement_to_firm(     &stmt->switchs);       return;
5387         case STATEMENT_WHILE:         while_statement_to_firm(      &stmt->whiles);        return;
5388
5389         case STATEMENT_BREAK:         create_jump_statement(stmt, get_break_label());                  return;
5390         case STATEMENT_CONTINUE:      create_jump_statement(stmt, continue_label);                     return;
5391         case STATEMENT_GOTO:          create_jump_statement(stmt, get_label_block(stmt->gotos.label)); return;
5392
5393         case STATEMENT_ERROR: panic("error statement found");
5394         }
5395         panic("statement not implemented");
5396 }
5397
5398 static int count_local_variables(const entity_t *entity,
5399                                  const entity_t *const last)
5400 {
5401         int count = 0;
5402         entity_t const *const end = last != NULL ? last->base.next : NULL;
5403         for (; entity != end; entity = entity->base.next) {
5404                 type_t *type;
5405                 bool    address_taken;
5406
5407                 if (entity->kind == ENTITY_VARIABLE) {
5408                         type          = skip_typeref(entity->declaration.type);
5409                         address_taken = entity->variable.address_taken;
5410                 } else if (entity->kind == ENTITY_PARAMETER) {
5411                         type          = skip_typeref(entity->declaration.type);
5412                         address_taken = entity->parameter.address_taken;
5413                 } else {
5414                         continue;
5415                 }
5416
5417                 if (!address_taken && is_type_scalar(type))
5418                         ++count;
5419         }
5420         return count;
5421 }
5422
5423 static void count_local_variables_in_stmt(statement_t *stmt, void *const env)
5424 {
5425         int *const count = env;
5426
5427         switch (stmt->kind) {
5428         case STATEMENT_DECLARATION: {
5429                 const declaration_statement_t *const decl_stmt = &stmt->declaration;
5430                 *count += count_local_variables(decl_stmt->declarations_begin,
5431                                 decl_stmt->declarations_end);
5432                 break;
5433         }
5434
5435         case STATEMENT_FOR:
5436                 *count += count_local_variables(stmt->fors.scope.entities, NULL);
5437                 break;
5438
5439         default:
5440                 break;
5441         }
5442 }
5443
5444 /**
5445  * Return the number of local (alias free) variables used by a function.
5446  */
5447 static int get_function_n_local_vars(entity_t *entity)
5448 {
5449         const function_t *function = &entity->function;
5450         int count = 0;
5451
5452         /* count parameters */
5453         count += count_local_variables(function->parameters.entities, NULL);
5454
5455         /* count local variables declared in body */
5456         walk_statements(function->statement, count_local_variables_in_stmt, &count);
5457         return count;
5458 }
5459
5460 /**
5461  * Build Firm code for the parameters of a function.
5462  */
5463 static void initialize_function_parameters(entity_t *entity)
5464 {
5465         assert(entity->kind == ENTITY_FUNCTION);
5466         ir_graph *irg             = current_ir_graph;
5467         ir_node  *args            = get_irg_args(irg);
5468         int       n               = 0;
5469         ir_type  *function_irtype;
5470
5471         if (entity->function.need_closure) {
5472                 /* add an extra parameter for the static link */
5473                 entity->function.static_link = new_r_Proj(args, mode_P_data, 0);
5474                 ++n;
5475
5476                 /* Matze: IMO this is wrong, nested functions should have an own
5477                  * type and not rely on strange parameters... */
5478                 function_irtype = create_method_type(&entity->declaration.type->function, true);
5479         } else {
5480                 function_irtype = get_ir_type(entity->declaration.type);
5481         }
5482
5483
5484
5485         entity_t *parameter = entity->function.parameters.entities;
5486         for ( ; parameter != NULL; parameter = parameter->base.next, ++n) {
5487                 if (parameter->kind != ENTITY_PARAMETER)
5488                         continue;
5489
5490                 assert(parameter->declaration.kind == DECLARATION_KIND_UNKNOWN);
5491                 type_t *type = skip_typeref(parameter->declaration.type);
5492
5493                 bool needs_entity = parameter->parameter.address_taken;
5494                 assert(!is_type_array(type));
5495                 if (is_type_compound(type)) {
5496                         needs_entity = true;
5497                 }
5498
5499                 ir_type *param_irtype = get_method_param_type(function_irtype, n);
5500                 if (needs_entity) {
5501                         ir_type   *frame_type = get_irg_frame_type(irg);
5502                         ir_entity *param
5503                                 = new_parameter_entity(frame_type, n, param_irtype);
5504                         parameter->declaration.kind
5505                                 = DECLARATION_KIND_PARAMETER_ENTITY;
5506                         parameter->parameter.v.entity = param;
5507                         continue;
5508                 }
5509
5510                 ir_mode *param_mode = get_type_mode(param_irtype);
5511                 long     pn         = n;
5512                 ir_node *value      = new_r_Proj(args, param_mode, pn);
5513
5514                 ir_mode *mode = get_ir_mode_storage(type);
5515                 value = create_conv(NULL, value, mode);
5516                 value = do_strict_conv(NULL, value);
5517
5518                 parameter->declaration.kind         = DECLARATION_KIND_PARAMETER;
5519                 parameter->parameter.v.value_number = next_value_number_function;
5520                 set_irg_loc_description(current_ir_graph, next_value_number_function,
5521                                         parameter);
5522                 ++next_value_number_function;
5523
5524                 set_value(parameter->parameter.v.value_number, value);
5525         }
5526 }
5527
5528 /**
5529  * Handle additional decl modifiers for IR-graphs
5530  *
5531  * @param irg            the IR-graph
5532  * @param dec_modifiers  additional modifiers
5533  */
5534 static void handle_decl_modifier_irg(ir_graph *irg,
5535                                      decl_modifiers_t decl_modifiers)
5536 {
5537         if (decl_modifiers & DM_NAKED) {
5538                 /* TRUE if the declaration includes the Microsoft
5539                    __declspec(naked) specifier. */
5540                 add_irg_additional_properties(irg, mtp_property_naked);
5541         }
5542         if (decl_modifiers & DM_FORCEINLINE) {
5543                 /* TRUE if the declaration includes the
5544                    Microsoft __forceinline specifier. */
5545                 set_irg_inline_property(irg, irg_inline_forced);
5546         }
5547         if (decl_modifiers & DM_NOINLINE) {
5548                 /* TRUE if the declaration includes the Microsoft
5549                    __declspec(noinline) specifier. */
5550                 set_irg_inline_property(irg, irg_inline_forbidden);
5551         }
5552 }
5553
5554 static void add_function_pointer(ir_type *segment, ir_entity *method,
5555                                  const char *unique_template)
5556 {
5557         ir_type   *method_type  = get_entity_type(method);
5558         ir_type   *ptr_type     = new_type_pointer(method_type);
5559
5560         /* these entities don't really have a name but firm only allows
5561          * "" in ld_ident.
5562          * Note that we mustn't give these entities a name since for example
5563          * Mach-O doesn't allow them. */
5564         ident     *ide          = id_unique(unique_template);
5565         ir_entity *ptr          = new_entity(segment, ide, ptr_type);
5566         ir_graph  *irg          = get_const_code_irg();
5567         ir_node   *val          = new_rd_SymConst_addr_ent(NULL, irg, mode_P_code,
5568                                                            method);
5569
5570         set_entity_ld_ident(ptr, new_id_from_chars("", 0));
5571         set_entity_compiler_generated(ptr, 1);
5572         set_entity_visibility(ptr, ir_visibility_private);
5573         add_entity_linkage(ptr, IR_LINKAGE_CONSTANT|IR_LINKAGE_HIDDEN_USER);
5574         set_atomic_ent_value(ptr, val);
5575 }
5576
5577 /**
5578  * Generate possible IJmp branches to a given label block.
5579  */
5580 static void gen_ijmp_branches(ir_node *block)
5581 {
5582         ir_node *ijmp;
5583         for (ijmp = ijmp_list; ijmp != NULL; ijmp = get_irn_link(ijmp)) {
5584                 add_immBlock_pred(block, ijmp);
5585         }
5586 }
5587
5588 /**
5589  * Create code for a function and all inner functions.
5590  *
5591  * @param entity  the function entity
5592  */
5593 static void create_function(entity_t *entity)
5594 {
5595         assert(entity->kind == ENTITY_FUNCTION);
5596         ir_entity *function_entity = get_function_entity(entity, current_outer_frame);
5597
5598         if (entity->function.statement == NULL)
5599                 return;
5600
5601         inner_functions     = NULL;
5602         current_trampolines = NULL;
5603
5604         if (entity->declaration.modifiers & DM_CONSTRUCTOR) {
5605                 ir_type *segment = get_segment_type(IR_SEGMENT_CONSTRUCTORS);
5606                 add_function_pointer(segment, function_entity, "constructor_ptr.%u");
5607         }
5608         if (entity->declaration.modifiers & DM_DESTRUCTOR) {
5609                 ir_type *segment = get_segment_type(IR_SEGMENT_DESTRUCTORS);
5610                 add_function_pointer(segment, function_entity, "destructor_ptr.%u");
5611         }
5612
5613         current_function_entity = entity;
5614         current_function_name   = NULL;
5615         current_funcsig         = NULL;
5616
5617         assert(all_labels == NULL);
5618         all_labels = NEW_ARR_F(label_t *, 0);
5619         ijmp_list  = NULL;
5620
5621         int       n_local_vars = get_function_n_local_vars(entity);
5622         ir_graph *irg          = new_ir_graph(function_entity, n_local_vars);
5623         current_ir_graph = irg;
5624
5625         ir_graph *old_current_function = current_function;
5626         current_function = irg;
5627
5628         ir_entity *const old_current_vararg_entity = current_vararg_entity;
5629         current_vararg_entity = NULL;
5630
5631         set_irg_fp_model(irg, firm_fp_model);
5632         tarval_enable_fp_ops(1);
5633         set_irn_dbg_info(get_irg_start_block(irg),
5634                          get_entity_dbg_info(function_entity));
5635
5636         /* set inline flags */
5637         if (entity->function.is_inline)
5638                 set_irg_inline_property(irg, irg_inline_recomended);
5639         handle_decl_modifier_irg(irg, entity->declaration.modifiers);
5640
5641         next_value_number_function = 0;
5642         initialize_function_parameters(entity);
5643         current_static_link = entity->function.static_link;
5644
5645         statement_to_firm(entity->function.statement);
5646
5647         ir_node *end_block = get_irg_end_block(irg);
5648
5649         /* do we have a return statement yet? */
5650         if (currently_reachable()) {
5651                 type_t *type = skip_typeref(entity->declaration.type);
5652                 assert(is_type_function(type));
5653                 const function_type_t *func_type   = &type->function;
5654                 const type_t          *return_type
5655                         = skip_typeref(func_type->return_type);
5656
5657                 ir_node *ret;
5658                 if (is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
5659                         ret = new_Return(get_store(), 0, NULL);
5660                 } else {
5661                         ir_mode *mode;
5662                         if (is_type_scalar(return_type)) {
5663                                 mode = get_ir_mode_storage(func_type->return_type);
5664                         } else {
5665                                 mode = mode_P_data;
5666                         }
5667
5668                         ir_node *in[1];
5669                         /* §5.1.2.2.3 main implicitly returns 0 */
5670                         if (is_main(entity)) {
5671                                 in[0] = new_Const(get_mode_null(mode));
5672                         } else {
5673                                 in[0] = new_Unknown(mode);
5674                         }
5675                         ret = new_Return(get_store(), 1, in);
5676                 }
5677                 add_immBlock_pred(end_block, ret);
5678         }
5679
5680         for (int i = ARR_LEN(all_labels) - 1; i >= 0; --i) {
5681                 label_t *label = all_labels[i];
5682                 if (label->address_taken) {
5683                         gen_ijmp_branches(label->block);
5684                 }
5685                 mature_immBlock(label->block);
5686         }
5687
5688         DEL_ARR_F(all_labels);
5689         all_labels = NULL;
5690
5691         irg_finalize_cons(irg);
5692
5693         /* finalize the frame type */
5694         ir_type *frame_type = get_irg_frame_type(irg);
5695         int      n          = get_compound_n_members(frame_type);
5696         int      align_all  = 4;
5697         int      offset     = 0;
5698         for (int i = 0; i < n; ++i) {
5699                 ir_entity *member      = get_compound_member(frame_type, i);
5700                 ir_type   *entity_type = get_entity_type(member);
5701
5702                 int align = get_type_alignment_bytes(entity_type);
5703                 if (align > align_all)
5704                         align_all = align;
5705                 int misalign = 0;
5706                 if (align > 0) {
5707                         misalign  = offset % align;
5708                         if (misalign > 0) {
5709                                 offset += align - misalign;
5710                         }
5711                 }
5712
5713                 set_entity_offset(member, offset);
5714                 offset += get_type_size_bytes(entity_type);
5715         }
5716         set_type_size_bytes(frame_type, offset);
5717         set_type_alignment_bytes(frame_type, align_all);
5718
5719         irg_verify(irg, VERIFY_ENFORCE_SSA);
5720         current_vararg_entity = old_current_vararg_entity;
5721         current_function      = old_current_function;
5722
5723         if (current_trampolines != NULL) {
5724                 DEL_ARR_F(current_trampolines);
5725                 current_trampolines = NULL;
5726         }
5727
5728         /* create inner functions if any */
5729         entity_t **inner = inner_functions;
5730         if (inner != NULL) {
5731                 ir_type *rem_outer_frame      = current_outer_frame;
5732                 current_outer_frame           = get_irg_frame_type(current_ir_graph);
5733                 for (int i = ARR_LEN(inner) - 1; i >= 0; --i) {
5734                         create_function(inner[i]);
5735                 }
5736                 DEL_ARR_F(inner);
5737
5738                 current_outer_frame      = rem_outer_frame;
5739         }
5740 }
5741
5742 static void scope_to_firm(scope_t *scope)
5743 {
5744         /* first pass: create declarations */
5745         entity_t *entity = scope->entities;
5746         for ( ; entity != NULL; entity = entity->base.next) {
5747                 if (entity->base.symbol == NULL)
5748                         continue;
5749
5750                 if (entity->kind == ENTITY_FUNCTION) {
5751                         if (entity->function.btk != BUILTIN_NONE) {
5752                                 /* builtins have no representation */
5753                                 continue;
5754                         }
5755                         (void)get_function_entity(entity, NULL);
5756                 } else if (entity->kind == ENTITY_VARIABLE) {
5757                         create_global_variable(entity);
5758                 } else if (entity->kind == ENTITY_NAMESPACE) {
5759                         scope_to_firm(&entity->namespacee.members);
5760                 }
5761         }
5762
5763         /* second pass: create code/initializers */
5764         entity = scope->entities;
5765         for ( ; entity != NULL; entity = entity->base.next) {
5766                 if (entity->base.symbol == NULL)
5767                         continue;
5768
5769                 if (entity->kind == ENTITY_FUNCTION) {
5770                         if (entity->function.btk != BUILTIN_NONE) {
5771                                 /* builtins have no representation */
5772                                 continue;
5773                         }
5774                         create_function(entity);
5775                 } else if (entity->kind == ENTITY_VARIABLE) {
5776                         assert(entity->declaration.kind
5777                                         == DECLARATION_KIND_GLOBAL_VARIABLE);
5778                         current_ir_graph = get_const_code_irg();
5779                         create_variable_initializer(entity);
5780                 }
5781         }
5782 }
5783
5784 void init_ast2firm(void)
5785 {
5786         obstack_init(&asm_obst);
5787         init_atomic_modes();
5788
5789         ir_set_debug_retrieve(dbg_retrieve);
5790         ir_set_type_debug_retrieve(dbg_print_type_dbg_info);
5791
5792         /* create idents for all known runtime functions */
5793         for (size_t i = 0; i < lengthof(rts_data); ++i) {
5794                 rts_idents[i] = new_id_from_str(rts_data[i].name);
5795         }
5796
5797         entitymap_init(&entitymap);
5798 }
5799
5800 static void init_ir_types(void)
5801 {
5802         static int ir_types_initialized = 0;
5803         if (ir_types_initialized)
5804                 return;
5805         ir_types_initialized = 1;
5806
5807         ir_type_int        = get_ir_type(type_int);
5808         ir_type_char       = get_ir_type(type_char);
5809         ir_type_const_char = get_ir_type(type_const_char);
5810         ir_type_wchar_t    = get_ir_type(type_wchar_t);
5811         ir_type_void       = get_ir_type(type_void);
5812
5813         be_params             = be_get_backend_param();
5814         mode_float_arithmetic = be_params->mode_float_arithmetic;
5815
5816         stack_param_align     = be_params->stack_param_align;
5817 }
5818
5819 void exit_ast2firm(void)
5820 {
5821         entitymap_destroy(&entitymap);
5822         obstack_free(&asm_obst, NULL);
5823 }
5824
5825 static void global_asm_to_firm(statement_t *s)
5826 {
5827         for (; s != NULL; s = s->base.next) {
5828                 assert(s->kind == STATEMENT_ASM);
5829
5830                 char const *const text = s->asms.asm_text.begin;
5831                 size_t            size = s->asms.asm_text.size;
5832
5833                 /* skip the last \0 */
5834                 if (text[size - 1] == '\0')
5835                         --size;
5836
5837                 ident *const id = new_id_from_chars(text, size);
5838                 add_irp_asm(id);
5839         }
5840 }
5841
5842 void translation_unit_to_firm(translation_unit_t *unit)
5843 {
5844         /* initialize firm arithmetic */
5845         tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
5846         ir_set_uninitialized_local_variable_func(uninitialized_local_var);
5847
5848         /* just to be sure */
5849         continue_label           = NULL;
5850         break_label              = NULL;
5851         current_switch           = NULL;
5852         current_translation_unit = unit;
5853
5854         init_ir_types();
5855
5856         scope_to_firm(&unit->scope);
5857         global_asm_to_firm(unit->global_asm);
5858
5859         current_ir_graph         = NULL;
5860         current_translation_unit = NULL;
5861 }