nsz Git - cparser/blob - ast2firm.c

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