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 "jump_target.h"
  39 #include "symbol_t.h"
  40 #include "token_t.h"
  41 #include "type_t.h"
  42 #include "ast_t.h"
  43 #include "entity_t.h"
  44 #include "parser.h"
  45 #include "diagnostic.h"
  46 #include "lang_features.h"
  47 #include "types.h"
  48 #include "type_hash.h"
  49 #include "mangle.h"
  50 #include "walk.h"
  51 #include "warning.h"
  52 #include "printer.h"
  53 #include "entitymap_t.h"
  54 #include "driver/firm_opt.h"
  55
  56 typedef struct trampoline_region trampoline_region;
  57 struct trampoline_region {
  58         ir_entity        *function;    /**< The function that is called by this trampoline */
  59         ir_entity        *region;      /**< created region for the trampoline */
  60 };
  61
  62 fp_model_t firm_fp_model = fp_model_precise;
  63
  64 static const backend_params *be_params;
  65
  66 static ir_type *ir_type_char;
  67
  68 /* architecture specific floating point arithmetic mode (if any) */
  69 static ir_mode *mode_float_arithmetic;
  70
  71 /* alignment of stack parameters */
  72 static unsigned stack_param_align;
  73
  74 static int         next_value_number_function;
  75 static jump_target continue_target;
  76 static jump_target break_target;
  77 static ir_node    *current_switch;
  78 static bool        saw_default_label;
  79 static entity_t  **inner_functions;
  80 static jump_target ijmp_target;
  81 static ir_node   **ijmp_ops;
  82 static ir_node   **ijmp_blocks;
  83 static bool        constant_folding;
  84
  85 #define PUSH_BREAK(val) \
  86         jump_target const old_break_target = break_target; \
  87         (init_jump_target(&break_target, (val)))
  88 #define POP_BREAK() \
  89         ((void)(break_target = old_break_target))
  90
  91 #define PUSH_CONTINUE(val) \
  92         jump_target const old_continue_target = continue_target; \
  93         (init_jump_target(&continue_target, (val)))
  94 #define POP_CONTINUE() \
  95         ((void)(continue_target = old_continue_target))
  96
  97 #define PUSH_IRG(val) \
  98         ir_graph *const old_irg = current_ir_graph; \
  99         ir_graph *const new_irg = (val); \
 100         ((void)(current_ir_graph = new_irg))
 101
 102 #define POP_IRG() \
 103         (assert(current_ir_graph == new_irg), (void)(current_ir_graph = old_irg))
 104
 105 static const entity_t     *current_function_entity;
 106 static ir_node            *current_function_name;
 107 static ir_node            *current_funcsig;
 108 static ir_graph           *current_function;
 109 static translation_unit_t *current_translation_unit;
 110 static trampoline_region  *current_trampolines;
 111 static ir_type            *current_outer_frame;
 112 static ir_node            *current_static_link;
 113 static ir_entity          *current_vararg_entity;
 114
 115 static entitymap_t  entitymap;
 116
 117 static struct obstack asm_obst;
 118
 119 typedef enum declaration_kind_t {
 120         DECLARATION_KIND_UNKNOWN,
 121         DECLARATION_KIND_VARIABLE_LENGTH_ARRAY,
 122         DECLARATION_KIND_GLOBAL_VARIABLE,
 123         DECLARATION_KIND_LOCAL_VARIABLE,
 124         DECLARATION_KIND_LOCAL_VARIABLE_ENTITY,
 125         DECLARATION_KIND_PARAMETER,
 126         DECLARATION_KIND_PARAMETER_ENTITY,
 127         DECLARATION_KIND_FUNCTION,
 128         DECLARATION_KIND_COMPOUND_MEMBER,
 129         DECLARATION_KIND_INNER_FUNCTION
 130 } declaration_kind_t;
 131
 132 static ir_type *get_ir_type_incomplete(type_t *type);
 133
 134 static void enqueue_inner_function(entity_t *entity)
 135 {
 136         if (inner_functions == NULL)
 137                 inner_functions = NEW_ARR_F(entity_t *, 0);
 138         ARR_APP1(entity_t*, inner_functions, entity);
 139 }
 140
 141 static ir_node *uninitialized_local_var(ir_graph *irg, ir_mode *mode, int pos)
 142 {
 143         const entity_t *entity = get_irg_loc_description(irg, pos);
 144
 145         if (entity != NULL) {
 146                 position_t const *const pos = &entity->base.pos;
 147                 warningf(WARN_UNINITIALIZED, pos, "'%N' might be used uninitialized", entity);
 148         }
 149         return new_r_Unknown(irg, mode);
 150 }
 151
 152 static src_loc_t dbg_retrieve(const dbg_info *dbg)
 153 {
 154         position_t const *const pos = (position_t const*)dbg;
 155         if (pos) {
 156                 return (src_loc_t){ pos->input_name, pos->lineno, pos->colno };
 157         } else {
 158                 return (src_loc_t){ NULL, 0, 0 };
 159         }
 160 }
 161
 162 static dbg_info *get_dbg_info(const position_t *pos)
 163 {
 164         return (dbg_info*) pos;
 165 }
 166
 167 static void dbg_print_type_dbg_info(char *buffer, size_t buffer_size,
 168                                     const type_dbg_info *dbg)
 169 {
 170         assert(dbg != NULL);
 171         print_to_buffer(buffer, buffer_size);
 172         const type_t *type = (const type_t*) dbg;
 173         print_type(type);
 174         finish_print_to_buffer();
 175 }
 176
 177 static type_dbg_info *get_type_dbg_info_(const type_t *type)
 178 {
 179         return (type_dbg_info*) type;
 180 }
 181
 182 /* is the current block a reachable one? */
 183 static bool currently_reachable(void)
 184 {
 185         ir_node *const block = get_cur_block();
 186         return block != NULL && !is_Bad(block);
 187 }
 188
 189 static void set_unreachable_now(void)
 190 {
 191         set_cur_block(NULL);
 192 }
 193
 194 ir_mode *atomic_modes[ATOMIC_TYPE_LAST+1];
 195
 196 static ir_node *expression_to_control_flow(expression_t const *expr, jump_target *true_target, jump_target *false_target);
 197 static ir_node *expression_to_value(expression_t const *expr);
 198
 199 static unsigned decide_modulo_shift(unsigned type_size)
 200 {
 201         if (architecture_modulo_shift == 0)
 202                 return 0;
 203         if (type_size < architecture_modulo_shift)
 204                 return architecture_modulo_shift;
 205         return type_size;
 206 }
 207
 208 static ir_mode *init_atomic_ir_mode(atomic_type_kind_t kind)
 209 {
 210         unsigned flags = get_atomic_type_flags(kind);
 211         unsigned size  = get_atomic_type_size(kind);
 212         if (flags & ATOMIC_TYPE_FLAG_FLOAT) {
 213                 switch (size) {
 214                 case 4:  return get_modeF();
 215                 case 8:  return get_modeD();
 216                 default: panic("unexpected kind");
 217                 }
 218         } else if (flags & ATOMIC_TYPE_FLAG_INTEGER) {
 219                 char            name[64];
 220                 unsigned        bit_size     = size * 8;
 221                 bool            is_signed    = (flags & ATOMIC_TYPE_FLAG_SIGNED) != 0;
 222                 unsigned        modulo_shift = decide_modulo_shift(bit_size);
 223
 224                 snprintf(name, sizeof(name), "%s%u", is_signed ? "I" : "U", bit_size);
 225                 return new_int_mode(name, irma_twos_complement, bit_size, is_signed,
 226                                     modulo_shift);
 227         }
 228
 229         return NULL;
 230 }
 231
 232 /**
 233  * Initialises the atomic modes depending on the machine size.
 234  */
 235 static void init_atomic_modes(void)
 236 {
 237         atomic_modes[ATOMIC_TYPE_VOID] = mode_ANY;
 238         for (int i = 0; i <= ATOMIC_TYPE_LAST; ++i) {
 239                 if (atomic_modes[i] != NULL)
 240                         continue;
 241                 atomic_modes[i] = init_atomic_ir_mode((atomic_type_kind_t) i);
 242         }
 243 }
 244
 245 ir_mode *get_atomic_mode(atomic_type_kind_t kind)
 246 {
 247         assert(kind <= ATOMIC_TYPE_LAST);
 248         return atomic_modes[kind];
 249 }
 250
 251 static ir_node *get_vla_size(array_type_t *const type)
 252 {
 253         ir_node *size_node = type->size_node;
 254         if (size_node == NULL) {
 255                 size_node = expression_to_value(type->size_expression);
 256                 type->size_node = size_node;
 257         }
 258         return size_node;
 259 }
 260
 261 static unsigned count_parameters(const function_type_t *function_type)
 262 {
 263         unsigned count = 0;
 264
 265         function_parameter_t *parameter = function_type->parameters;
 266         for ( ; parameter != NULL; parameter = parameter->next) {
 267                 ++count;
 268         }
 269
 270         return count;
 271 }
 272
 273 static ir_type *create_primitive_irtype(atomic_type_kind_t akind,
 274                                         type_dbg_info *dbgi)
 275 {
 276         ir_mode        *mode      = atomic_modes[akind];
 277         ir_type        *irtype    = new_d_type_primitive(mode, dbgi);
 278         unsigned        alignment = get_atomic_type_alignment(akind);
 279         unsigned        size      = get_atomic_type_size(akind);
 280
 281         set_type_size_bytes(irtype, size);
 282         set_type_alignment_bytes(irtype, alignment);
 283
 284         return irtype;
 285 }
 286
 287 /**
 288  * Creates a Firm type for an atomic type
 289  */
 290 static ir_type *create_atomic_type(atomic_type_kind_t akind, const type_t *type)
 291 {
 292         type_dbg_info *dbgi = get_type_dbg_info_(type);
 293         return create_primitive_irtype(akind, dbgi);
 294 }
 295
 296 /**
 297  * Creates a Firm type for a complex type
 298  */
 299 static ir_type *create_complex_type(atomic_type_kind_t akind,
 300                                     const type_t *type)
 301 {
 302         type_dbg_info *dbgi   = get_type_dbg_info_(type);
 303         ir_type       *etype  = create_primitive_irtype(akind, NULL);
 304         ir_type       *irtype = new_d_type_array(1, etype, dbgi);
 305
 306         int align = get_type_alignment_bytes(etype);
 307         set_type_alignment_bytes(irtype, align);
 308         unsigned n_elements = 2;
 309         set_array_bounds_int(irtype, 0, 0, n_elements);
 310         size_t elemsize = get_type_size_bytes(etype);
 311         if (elemsize % align > 0) {
 312                 elemsize += align - (elemsize % align);
 313         }
 314         set_type_size_bytes(irtype, n_elements * elemsize);
 315
 316         return irtype;
 317 }
 318
 319 /**
 320  * Creates a Firm type for an imaginary type
 321  */
 322 static ir_type *create_imaginary_type(const atomic_type_t *type)
 323 {
 324         return create_atomic_type(type->akind, (const type_t*)type);
 325 }
 326
 327 /**
 328  * return type of a parameter (and take transparent union gnu extension into
 329  * account)
 330  */
 331 static type_t *get_parameter_type(type_t *orig_type)
 332 {
 333         type_t *type = skip_typeref(orig_type);
 334         if (is_type_union(type)
 335                         && get_type_modifiers(orig_type) & DM_TRANSPARENT_UNION) {
 336                 compound_t *compound = type->compound.compound;
 337                 type                 = compound->members.entities->declaration.type;
 338         }
 339
 340         return type;
 341 }
 342
 343 static ir_type *create_method_type(const function_type_t *function_type, bool for_closure)
 344 {
 345         type_t        *return_type  = skip_typeref(function_type->return_type);
 346
 347         int            n_parameters = count_parameters(function_type)
 348                                        + (for_closure ? 1 : 0);
 349         int            n_results    = is_type_void(return_type) ? 0 : 1;
 350         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) function_type);
 351         ir_type       *irtype       = new_d_type_method(n_parameters, n_results, dbgi);
 352
 353         if (!is_type_void(return_type)) {
 354                 ir_type *restype = get_ir_type(return_type);
 355                 set_method_res_type(irtype, 0, restype);
 356         }
 357
 358         function_parameter_t *parameter = function_type->parameters;
 359         int                   n         = 0;
 360         if (for_closure) {
 361                 ir_type *p_irtype = get_ir_type(type_void_ptr);
 362                 set_method_param_type(irtype, n, p_irtype);
 363                 ++n;
 364         }
 365         for ( ; parameter != NULL; parameter = parameter->next) {
 366                 type_t  *type     = get_parameter_type(parameter->type);
 367                 ir_type *p_irtype = get_ir_type(type);
 368                 set_method_param_type(irtype, n, p_irtype);
 369                 ++n;
 370         }
 371
 372         bool is_variadic = function_type->variadic;
 373
 374         if (is_variadic)
 375                 set_method_variadicity(irtype, variadicity_variadic);
 376
 377         unsigned cc = get_method_calling_convention(irtype);
 378         switch (function_type->calling_convention) {
 379         case CC_DEFAULT: /* unspecified calling convention, equal to one of the other, typically cdecl */
 380         case CC_CDECL:
 381 is_cdecl:
 382                 set_method_calling_convention(irtype, SET_CDECL(cc));
 383                 break;
 384
 385         case CC_STDCALL:
 386                 if (is_variadic)
 387                         goto is_cdecl;
 388
 389                 /* only non-variadic function can use stdcall, else use cdecl */
 390                 set_method_calling_convention(irtype, SET_STDCALL(cc));
 391                 break;
 392
 393         case CC_FASTCALL:
 394                 if (is_variadic)
 395                         goto is_cdecl;
 396                 /* only non-variadic function can use fastcall, else use cdecl */
 397                 set_method_calling_convention(irtype, SET_FASTCALL(cc));
 398                 break;
 399
 400         case CC_THISCALL:
 401                 /* Hmm, leave default, not accepted by the parser yet. */
 402                 break;
 403         }
 404
 405         if (for_closure)
 406                 set_method_calling_convention(irtype, get_method_calling_convention(irtype) | cc_this_call);
 407
 408         const decl_modifiers_t modifiers = function_type->modifiers;
 409         if (modifiers & DM_CONST)
 410                 add_method_additional_properties(irtype, mtp_property_const);
 411         if (modifiers & DM_PURE)
 412                 add_method_additional_properties(irtype, mtp_property_pure);
 413         if (modifiers & DM_RETURNS_TWICE)
 414                 add_method_additional_properties(irtype, mtp_property_returns_twice);
 415         if (modifiers & DM_NORETURN)
 416                 add_method_additional_properties(irtype, mtp_property_noreturn);
 417         if (modifiers & DM_NOTHROW)
 418                 add_method_additional_properties(irtype, mtp_property_nothrow);
 419         if (modifiers & DM_MALLOC)
 420                 add_method_additional_properties(irtype, mtp_property_malloc);
 421
 422         return irtype;
 423 }
 424
 425 static ir_type *create_pointer_type(pointer_type_t *type)
 426 {
 427         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) type);
 428         type_t        *points_to    = type->points_to;
 429         ir_type       *ir_points_to = get_ir_type_incomplete(points_to);
 430         ir_type       *irtype       = new_d_type_pointer(ir_points_to, dbgi);
 431
 432         return irtype;
 433 }
 434
 435 static ir_type *create_reference_type(reference_type_t *type)
 436 {
 437         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) type);
 438         type_t        *refers_to    = type->refers_to;
 439         ir_type       *ir_refers_to = get_ir_type_incomplete(refers_to);
 440         ir_type       *irtype       = new_d_type_pointer(ir_refers_to, dbgi);
 441
 442         return irtype;
 443 }
 444
 445 static ir_type *create_array_type(array_type_t *type)
 446 {
 447         type_dbg_info *dbgi            = get_type_dbg_info_((const type_t*) type);
 448         type_t        *element_type    = type->element_type;
 449         ir_type       *ir_element_type = get_ir_type(element_type);
 450         ir_type       *irtype          = new_d_type_array(1, ir_element_type, dbgi);
 451
 452         const int align = get_type_alignment_bytes(ir_element_type);
 453         set_type_alignment_bytes(irtype, align);
 454
 455         if (type->size_constant) {
 456                 int n_elements = type->size;
 457
 458                 set_array_bounds_int(irtype, 0, 0, n_elements);
 459
 460                 size_t elemsize = get_type_size_bytes(ir_element_type);
 461                 if (elemsize % align > 0) {
 462                         elemsize += align - (elemsize % align);
 463                 }
 464                 set_type_size_bytes(irtype, n_elements * elemsize);
 465         } else {
 466                 set_array_lower_bound_int(irtype, 0, 0);
 467         }
 468         set_type_state(irtype, layout_fixed);
 469
 470         return irtype;
 471 }
 472
 473 /**
 474  * Return the signed integer type of size bits.
 475  *
 476  * @param size   the size
 477  */
 478 static ir_type *get_signed_int_type_for_bit_size(ir_type *base_tp,
 479                                                  unsigned size,
 480                                                                                                  const type_t *type)
 481 {
 482         static ir_mode *s_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 = s_modes[size];
 490         if (mode == NULL) {
 491                 char name[32];
 492
 493                 snprintf(name, sizeof(name), "bf_I%u", size);
 494                 mode = new_int_mode(name, irma_twos_complement, size, 1, 0);
 495                 s_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 /**
 506  * Return the unsigned integer type of size bits.
 507  *
 508  * @param size   the size
 509  */
 510 static ir_type *get_unsigned_int_type_for_bit_size(ir_type *base_tp,
 511                                                    unsigned size,
 512                                                                                                    const type_t *type)
 513 {
 514         static ir_mode *u_modes[64 + 1] = {NULL, };
 515         ir_type *res;
 516         ir_mode *mode;
 517
 518         if (size <= 0 || size > 64)
 519                 return NULL;
 520
 521         mode = u_modes[size];
 522         if (mode == NULL) {
 523                 char name[32];
 524
 525                 snprintf(name, sizeof(name), "bf_U%u", size);
 526                 mode = new_int_mode(name, irma_twos_complement, size, 0, 0);
 527                 u_modes[size] = mode;
 528         }
 529
 530         type_dbg_info *dbgi = get_type_dbg_info_(type);
 531         res = new_d_type_primitive(mode, dbgi);
 532         set_primitive_base_type(res, base_tp);
 533
 534         return res;
 535 }
 536
 537 static ir_type *create_bitfield_type(const entity_t *entity)
 538 {
 539         assert(entity->kind == ENTITY_COMPOUND_MEMBER);
 540         type_t *base = skip_typeref(entity->declaration.type);
 541         assert(is_type_integer(base));
 542         ir_type *irbase = get_ir_type(base);
 543
 544         unsigned bit_size = entity->compound_member.bit_size;
 545
 546         if (is_type_signed(base)) {
 547                 return get_signed_int_type_for_bit_size(irbase, bit_size, base);
 548         } else {
 549                 return get_unsigned_int_type_for_bit_size(irbase, bit_size, base);
 550         }
 551 }
 552
 553 /**
 554  * Construct firm type from ast struct type.
 555  */
 556 static ir_type *create_compound_type(compound_type_t *const type, bool const incomplete)
 557 {
 558         compound_t *compound = type->compound;
 559
 560         if (compound->irtype != NULL && (compound->irtype_complete || incomplete)) {
 561                 return compound->irtype;
 562         }
 563
 564         bool const is_union = type->base.kind == TYPE_COMPOUND_UNION;
 565
 566         symbol_t *type_symbol = compound->base.symbol;
 567         ident    *id;
 568         if (type_symbol != NULL) {
 569                 id = new_id_from_str(type_symbol->string);
 570         } else {
 571                 if (is_union) {
 572                         id = id_unique("__anonymous_union.%u");
 573                 } else {
 574                         id = id_unique("__anonymous_struct.%u");
 575                 }
 576         }
 577
 578         ir_type *irtype;
 579         if (is_union) {
 580                 irtype = new_type_union(id);
 581         } else {
 582                 irtype = new_type_struct(id);
 583         }
 584
 585         compound->irtype_complete = false;
 586         compound->irtype          = irtype;
 587
 588         if (incomplete)
 589                 return irtype;
 590
 591         if (is_union) {
 592                 layout_union_type(type);
 593         } else {
 594                 layout_struct_type(type);
 595         }
 596
 597         compound->irtype_complete = true;
 598
 599         entity_t *entry = compound->members.entities;
 600         for ( ; entry != NULL; entry = entry->base.next) {
 601                 if (entry->kind != ENTITY_COMPOUND_MEMBER)
 602                         continue;
 603
 604                 symbol_t *symbol     = entry->base.symbol;
 605                 type_t   *entry_type = entry->declaration.type;
 606                 ident    *ident;
 607                 if (symbol == NULL) {
 608                         /* anonymous bitfield member, skip */
 609                         if (entry->compound_member.bitfield)
 610                                 continue;
 611                         assert(is_type_compound(entry_type));
 612                         ident = id_unique("anon.%u");
 613                 } else {
 614                         ident = new_id_from_str(symbol->string);
 615                 }
 616
 617                 dbg_info *dbgi = get_dbg_info(&entry->base.pos);
 618
 619                 ir_type *entry_irtype;
 620                 if (entry->compound_member.bitfield) {
 621                         entry_irtype = create_bitfield_type(entry);
 622                 } else {
 623                         entry_irtype = get_ir_type(entry_type);
 624                 }
 625                 ir_entity *entity = new_d_entity(irtype, ident, entry_irtype, dbgi);
 626
 627                 set_entity_offset(entity, entry->compound_member.offset);
 628                 set_entity_offset_bits_remainder(entity,
 629                                                  entry->compound_member.bit_offset);
 630
 631                 assert(entry->declaration.kind == DECLARATION_KIND_UNKNOWN);
 632                 entry->declaration.kind       = DECLARATION_KIND_COMPOUND_MEMBER;
 633                 entry->compound_member.entity = entity;
 634         }
 635
 636         set_type_alignment_bytes(irtype, compound->alignment);
 637         set_type_size_bytes(irtype, compound->size);
 638         set_type_state(irtype, layout_fixed);
 639
 640         return irtype;
 641 }
 642
 643 void determine_enum_values(enum_type_t *const type)
 644 {
 645         ir_mode   *const mode    = atomic_modes[type->base.akind];
 646         ir_tarval *const one     = get_mode_one(mode);
 647         ir_tarval *      tv_next = get_mode_null(mode);
 648
 649         enum_t   *enume = type->enume;
 650         entity_t *entry = enume->base.next;
 651         for (; entry != NULL; entry = entry->base.next) {
 652                 if (entry->kind != ENTITY_ENUM_VALUE)
 653                         break;
 654
 655                 expression_t *const init = entry->enum_value.value;
 656                 if (init != NULL) {
 657                         tv_next = fold_constant_to_tarval(init);
 658                 }
 659                 assert(entry->enum_value.tv == NULL || entry->enum_value.tv == tv_next);
 660                 entry->enum_value.tv = tv_next;
 661                 tv_next = tarval_add(tv_next, one);
 662         }
 663 }
 664
 665 static ir_type *create_enum_type(enum_type_t *const type)
 666 {
 667         return create_atomic_type(type->base.akind, (const type_t*) type);
 668 }
 669
 670 static ir_type *get_ir_type_incomplete(type_t *type)
 671 {
 672         type = skip_typeref(type);
 673
 674         if (type->base.firm_type != NULL) {
 675                 return type->base.firm_type;
 676         }
 677
 678         if (is_type_compound(type)) {
 679                 return create_compound_type(&type->compound, true);
 680         } else {
 681                 return get_ir_type(type);
 682         }
 683 }
 684
 685 ir_type *get_ir_type(type_t *type)
 686 {
 687         type = skip_typeref(type);
 688
 689         if (type->base.firm_type != NULL) {
 690                 return type->base.firm_type;
 691         }
 692
 693         ir_type *firm_type = NULL;
 694         switch (type->kind) {
 695         case TYPE_ATOMIC:
 696                 firm_type = create_atomic_type(type->atomic.akind, type);
 697                 break;
 698         case TYPE_COMPLEX:
 699                 firm_type = create_complex_type(type->atomic.akind, type);
 700                 break;
 701         case TYPE_IMAGINARY:
 702                 firm_type = create_imaginary_type(&type->atomic);
 703                 break;
 704         case TYPE_FUNCTION:
 705                 firm_type = create_method_type(&type->function, false);
 706                 break;
 707         case TYPE_POINTER:
 708                 firm_type = create_pointer_type(&type->pointer);
 709                 break;
 710         case TYPE_REFERENCE:
 711                 firm_type = create_reference_type(&type->reference);
 712                 break;
 713         case TYPE_ARRAY:
 714                 firm_type = create_array_type(&type->array);
 715                 break;
 716         case TYPE_COMPOUND_STRUCT:
 717         case TYPE_COMPOUND_UNION:
 718                 firm_type = create_compound_type(&type->compound, false);
 719                 break;
 720         case TYPE_ENUM:
 721                 firm_type = create_enum_type(&type->enumt);
 722                 break;
 723
 724         case TYPE_ERROR:
 725         case TYPE_TYPEOF:
 726         case TYPE_TYPEDEF:
 727                 break;
 728         }
 729         if (firm_type == NULL)
 730                 panic("unknown type found");
 731
 732         type->base.firm_type = firm_type;
 733         return firm_type;
 734 }
 735
 736 static ir_mode *get_ir_mode_storage(type_t *type)
 737 {
 738         type = skip_typeref(type);
 739
 740         /* Firm doesn't report a mode for arrays and structs/unions. */
 741         if (!is_type_scalar(type)) {
 742                 return mode_P_data;
 743         }
 744
 745         ir_type *const irtype = get_ir_type(type);
 746         ir_mode *const mode   = get_type_mode(irtype);
 747         assert(mode != NULL);
 748         return mode;
 749 }
 750
 751 /*
 752  * get arithmetic mode for a type. This is different from get_ir_mode_storage,
 753  * int that it returns bigger modes for floating point on some platforms
 754  * (x87 internally does arithemtic with 80bits)
 755  */
 756 static ir_mode *get_ir_mode_arithmetic(type_t *type)
 757 {
 758         ir_mode *mode = get_ir_mode_storage(type);
 759         if (mode_is_float(mode) && mode_float_arithmetic != NULL) {
 760                 return mode_float_arithmetic;
 761         }
 762
 763         return mode;
 764 }
 765
 766 /**
 767  * Return a node representing the size of a type.
 768  */
 769 static ir_node *get_type_size_node(type_t *type)
 770 {
 771         ir_mode *const mode = get_ir_mode_storage(type_size_t);
 772         type = skip_typeref(type);
 773
 774         if (is_type_array(type) && type->array.is_vla) {
 775                 ir_node *size_node = get_vla_size(&type->array);
 776                 ir_node *elem_size = get_type_size_node(type->array.element_type);
 777                 ir_node *real_size = new_d_Mul(NULL, size_node, elem_size, mode);
 778                 return real_size;
 779         }
 780
 781         unsigned const size = get_type_size(type);
 782         return new_Const_long(mode, size);
 783 }
 784
 785 /** Names of the runtime functions. */
 786 static const struct {
 787         int        id;           /**< the rts id */
 788         int        n_res;        /**< number of return values */
 789         const char *name;        /**< the name of the rts function */
 790         int        n_params;     /**< number of parameters */
 791         unsigned   flags;        /**< language flags */
 792 } rts_data[] = {
 793         { rts_debugbreak, 0, "__debugbreak", 0, _MS },
 794         { rts_abort,      0, "abort",        0, _C89 },
 795         { rts_alloca,     1, "alloca",       1, _ALL },
 796         { rts_abs,        1, "abs",          1, _C89 },
 797         { rts_labs,       1, "labs",         1, _C89 },
 798         { rts_llabs,      1, "llabs",        1, _C99 },
 799         { rts_imaxabs,    1, "imaxabs",      1, _C99 },
 800
 801         { rts_fabs,       1, "fabs",         1, _C89 },
 802         { rts_sqrt,       1, "sqrt",         1, _C89 },
 803         { rts_cbrt,       1, "cbrt",         1, _C99 },
 804         { rts_exp,        1, "exp",          1, _C89 },
 805         { rts_exp2,       1, "exp2",         1, _C89 },
 806         { rts_exp10,      1, "exp10",        1, _GNUC },
 807         { rts_log,        1, "log",          1, _C89 },
 808         { rts_log2,       1, "log2",         1, _C89 },
 809         { rts_log10,      1, "log10",        1, _C89 },
 810         { rts_pow,        1, "pow",          2, _C89 },
 811         { rts_sin,        1, "sin",          1, _C89 },
 812         { rts_cos,        1, "cos",          1, _C89 },
 813         { rts_tan,        1, "tan",          1, _C89 },
 814         { rts_asin,       1, "asin",         1, _C89 },
 815         { rts_acos,       1, "acos",         1, _C89 },
 816         { rts_atan,       1, "atan",         1, _C89 },
 817         { rts_sinh,       1, "sinh",         1, _C89 },
 818         { rts_cosh,       1, "cosh",         1, _C89 },
 819         { rts_tanh,       1, "tanh",         1, _C89 },
 820
 821         { rts_fabsf,      1, "fabsf",        1, _C99 },
 822         { rts_sqrtf,      1, "sqrtf",        1, _C99 },
 823         { rts_cbrtf,      1, "cbrtf",        1, _C99 },
 824         { rts_expf,       1, "expf",         1, _C99 },
 825         { rts_exp2f,      1, "exp2f",        1, _C99 },
 826         { rts_exp10f,     1, "exp10f",       1, _GNUC },
 827         { rts_logf,       1, "logf",         1, _C99 },
 828         { rts_log2f,      1, "log2f",        1, _C99 },
 829         { rts_log10f,     1, "log10f",       1, _C99 },
 830         { rts_powf,       1, "powf",         2, _C99 },
 831         { rts_sinf,       1, "sinf",         1, _C99 },
 832         { rts_cosf,       1, "cosf",         1, _C99 },
 833         { rts_tanf,       1, "tanf",         1, _C99 },
 834         { rts_asinf,      1, "asinf",        1, _C99 },
 835         { rts_acosf,      1, "acosf",        1, _C99 },
 836         { rts_atanf,      1, "atanf",        1, _C99 },
 837         { rts_sinhf,      1, "sinhf",        1, _C99 },
 838         { rts_coshf,      1, "coshf",        1, _C99 },
 839         { rts_tanhf,      1, "tanhf",        1, _C99 },
 840
 841         { rts_fabsl,      1, "fabsl",        1, _C99 },
 842         { rts_sqrtl,      1, "sqrtl",        1, _C99 },
 843         { rts_cbrtl,      1, "cbrtl",        1, _C99 },
 844         { rts_expl,       1, "expl",         1, _C99 },
 845         { rts_exp2l,      1, "exp2l",        1, _C99 },
 846         { rts_exp10l,     1, "exp10l",       1, _GNUC },
 847         { rts_logl,       1, "logl",         1, _C99 },
 848         { rts_log2l,      1, "log2l",        1, _C99 },
 849         { rts_log10l,     1, "log10l",       1, _C99 },
 850         { rts_powl,       1, "powl",         2, _C99 },
 851         { rts_sinl,       1, "sinl",         1, _C99 },
 852         { rts_cosl,       1, "cosl",         1, _C99 },
 853         { rts_tanl,       1, "tanl",         1, _C99 },
 854         { rts_asinl,      1, "asinl",        1, _C99 },
 855         { rts_acosl,      1, "acosl",        1, _C99 },
 856         { rts_atanl,      1, "atanl",        1, _C99 },
 857         { rts_sinhl,      1, "sinhl",        1, _C99 },
 858         { rts_coshl,      1, "coshl",        1, _C99 },
 859         { rts_tanhl,      1, "tanhl",        1, _C99 },
 860
 861         { rts_strcmp,     1, "strcmp",       2, _C89 },
 862         { rts_strncmp,    1, "strncmp",      3, _C89 },
 863         { rts_strcpy,     1, "strcpy",       2, _C89 },
 864         { rts_strlen,     1, "strlen",       1, _C89 },
 865         { rts_memcpy,     1, "memcpy",       3, _C89 },
 866         { rts_mempcpy,    1, "mempcpy",      3, _GNUC },
 867         { rts_memmove,    1, "memmove",      3, _C89 },
 868         { rts_memset,     1, "memset",       3, _C89 },
 869         { rts_memcmp,     1, "memcmp",       3, _C89 },
 870 };
 871
 872 static ident *rts_idents[lengthof(rts_data)];
 873
 874 static create_ld_ident_func create_ld_ident = create_name_linux_elf;
 875
 876 void set_create_ld_ident(ident *(*func)(entity_t*))
 877 {
 878         create_ld_ident = func;
 879 }
 880
 881 static bool declaration_is_definition(const entity_t *entity)
 882 {
 883         switch (entity->kind) {
 884         case ENTITY_VARIABLE:
 885                 return entity->declaration.storage_class != STORAGE_CLASS_EXTERN;
 886         case ENTITY_FUNCTION:
 887                 return entity->function.body != NULL;
 888         case ENTITY_PARAMETER:
 889         case ENTITY_COMPOUND_MEMBER:
 890                 return false;
 891         case ENTITY_TYPEDEF:
 892         case ENTITY_ENUM:
 893         case ENTITY_ENUM_VALUE:
 894         case ENTITY_NAMESPACE:
 895         case ENTITY_LABEL:
 896         case ENTITY_LOCAL_LABEL:
 897                 break;
 898         }
 899         panic("entity is not a declaration");
 900 }
 901
 902 /**
 903  * Handle GNU attributes for entities
 904  *
 905  * @param ent   the entity
 906  * @param decl  the routine declaration
 907  */
 908 static void handle_decl_modifiers(ir_entity *irentity, entity_t *entity)
 909 {
 910         assert(is_declaration(entity));
 911         decl_modifiers_t modifiers = entity->declaration.modifiers;
 912
 913         if (is_method_entity(irentity)) {
 914                 if (modifiers & DM_PURE)
 915                         add_entity_additional_properties(irentity, mtp_property_pure);
 916                 if (modifiers & DM_CONST)
 917                         add_entity_additional_properties(irentity, mtp_property_const);
 918                 if (modifiers & DM_NOINLINE)
 919                         add_entity_additional_properties(irentity, mtp_property_noinline);
 920                 if (modifiers & DM_FORCEINLINE)
 921                         add_entity_additional_properties(irentity, mtp_property_always_inline);
 922                 if (modifiers & DM_NAKED)
 923                         add_entity_additional_properties(irentity, mtp_property_naked);
 924                 if (entity->kind == ENTITY_FUNCTION && entity->function.is_inline)
 925                         add_entity_additional_properties(irentity,
 926                                                                                          mtp_property_inline_recommended);
 927         }
 928         if ((modifiers & DM_USED) && declaration_is_definition(entity)) {
 929                 add_entity_linkage(irentity, IR_LINKAGE_HIDDEN_USER);
 930         }
 931         if ((modifiers & DM_WEAK) && declaration_is_definition(entity)
 932             && entity->declaration.storage_class != STORAGE_CLASS_EXTERN) {
 933                 add_entity_linkage(irentity, IR_LINKAGE_WEAK);
 934         }
 935 }
 936
 937 static bool is_main(entity_t *entity)
 938 {
 939         static symbol_t *sym_main = NULL;
 940         if (sym_main == NULL) {
 941                 sym_main = symbol_table_insert("main");
 942         }
 943
 944         if (entity->base.symbol != sym_main)
 945                 return false;
 946         /* must be in outermost scope */
 947         if (entity->base.parent_scope != &current_translation_unit->scope)
 948                 return false;
 949
 950         return true;
 951 }
 952
 953 /**
 954  * Creates an entity representing a function.
 955  *
 956  * @param entity       the function declaration/definition
 957  * @param owner_type   the owner type of this function, NULL
 958  *                     for global functions
 959  */
 960 static ir_entity *get_function_entity(entity_t *entity, ir_type *owner_type)
 961 {
 962         assert(entity->kind == ENTITY_FUNCTION);
 963         if (entity->function.irentity != NULL)
 964                 return entity->function.irentity;
 965
 966         switch (entity->function.btk) {
 967         case BUILTIN_NONE:
 968         case BUILTIN_LIBC:
 969         case BUILTIN_LIBC_CHECK:
 970                 break;
 971         default:
 972                 return NULL;
 973         }
 974
 975         symbol_t *symbol = entity->base.symbol;
 976         ident    *id     = new_id_from_str(symbol->string);
 977
 978         /* already an entity defined? */
 979         ir_entity *irentity = entitymap_get(&entitymap, symbol);
 980         bool const has_body = entity->function.body != NULL;
 981         if (irentity != NULL) {
 982                 goto entity_created;
 983         }
 984
 985         ir_type *ir_type_method;
 986         if (entity->function.need_closure)
 987                 ir_type_method = create_method_type(&entity->declaration.type->function, true);
 988         else
 989                 ir_type_method = get_ir_type(entity->declaration.type);
 990
 991         bool nested_function = false;
 992         if (owner_type == NULL)
 993                 owner_type = get_glob_type();
 994         else
 995                 nested_function = true;
 996
 997         dbg_info *const dbgi = get_dbg_info(&entity->base.pos);
 998         irentity = new_d_entity(owner_type, id, ir_type_method, dbgi);
 999
1000         ident *ld_id;
1001         if (nested_function)
1002                 ld_id = id_unique("inner.%u");
1003         else
1004                 ld_id = create_ld_ident(entity);
1005         set_entity_ld_ident(irentity, ld_id);
1006
1007         handle_decl_modifiers(irentity, entity);
1008
1009         if (! nested_function) {
1010                 storage_class_tag_t const storage_class
1011                         = (storage_class_tag_t) entity->declaration.storage_class;
1012                 if (storage_class == STORAGE_CLASS_STATIC) {
1013                     set_entity_visibility(irentity, ir_visibility_local);
1014                 } else {
1015                     set_entity_visibility(irentity, ir_visibility_external);
1016                 }
1017
1018                 bool const is_inline = entity->function.is_inline;
1019                 if (is_inline && has_body) {
1020                         if (((c_mode & _C99) && storage_class == STORAGE_CLASS_NONE)
1021                             || ((c_mode & _C99) == 0
1022                                 && storage_class == STORAGE_CLASS_EXTERN)) {
1023                                 add_entity_linkage(irentity, IR_LINKAGE_NO_CODEGEN);
1024                         }
1025                 }
1026         } else {
1027                 /* nested functions are always local */
1028                 set_entity_visibility(irentity, ir_visibility_local);
1029         }
1030
1031         /* We should check for file scope here, but as long as we compile C only
1032            this is not needed. */
1033         if (!freestanding && !has_body) {
1034                 /* check for a known runtime function */
1035                 for (size_t i = 0; i < lengthof(rts_data); ++i) {
1036                         if (id != rts_idents[i])
1037                                 continue;
1038
1039                         function_type_t *function_type
1040                                 = &entity->declaration.type->function;
1041                         /* rts_entities code can't handle a "wrong" number of parameters */
1042                         if (function_type->unspecified_parameters)
1043                                 continue;
1044
1045                         /* check number of parameters */
1046                         int n_params = count_parameters(function_type);
1047                         if (n_params != rts_data[i].n_params)
1048                                 continue;
1049
1050                         type_t *return_type = skip_typeref(function_type->return_type);
1051                         int     n_res       = is_type_void(return_type) ? 0 : 1;
1052                         if (n_res != rts_data[i].n_res)
1053                                 continue;
1054
1055                         /* ignore those rts functions not necessary needed for current mode */
1056                         if ((c_mode & rts_data[i].flags) == 0)
1057                                 continue;
1058                         assert(rts_entities[rts_data[i].id] == NULL);
1059                         rts_entities[rts_data[i].id] = irentity;
1060                 }
1061         }
1062
1063         entitymap_insert(&entitymap, symbol, irentity);
1064
1065 entity_created:
1066         entity->declaration.kind  = DECLARATION_KIND_FUNCTION;
1067         entity->function.irentity = irentity;
1068
1069         return irentity;
1070 }
1071
1072 /**
1073  * Creates a SymConst for a given entity.
1074  *
1075  * @param dbgi    debug info
1076  * @param entity  the entity
1077  */
1078 static ir_node *create_symconst(dbg_info *dbgi, ir_entity *entity)
1079 {
1080         assert(entity != NULL);
1081         union symconst_symbol sym;
1082         sym.entity_p = entity;
1083         return new_d_SymConst(dbgi, mode_P, sym, symconst_addr_ent);
1084 }
1085
1086 static ir_node *create_Const_from_bool(ir_mode *const mode, bool const v)
1087 {
1088         return new_Const((v ? get_mode_one : get_mode_null)(mode));
1089 }
1090
1091 static ir_node *create_conv(dbg_info *dbgi, ir_node *value, ir_mode *dest_mode)
1092 {
1093         ir_mode *value_mode = get_irn_mode(value);
1094
1095         if (value_mode == dest_mode)
1096                 return value;
1097
1098         return new_d_Conv(dbgi, value, dest_mode);
1099 }
1100
1101 static ir_node *conv_to_storage_type(dbg_info *const dbgi, ir_node *const val, type_t *const type)
1102 {
1103         ir_mode *const mode = get_ir_mode_storage(type);
1104         return create_conv(dbgi, val, mode);
1105 }
1106
1107 /**
1108  * Creates a SymConst node representing a string constant.
1109  *
1110  * @param src_pos    the source position of the string constant
1111  * @param id_prefix  a prefix for the name of the generated string constant
1112  * @param value      the value of the string constant
1113  */
1114 static ir_node *string_to_firm(position_t const *const src_pos, char const *const id_prefix, string_t const *const value)
1115 {
1116         size_t            const slen        = get_string_len(value) + 1;
1117         ir_initializer_t *const initializer = create_initializer_compound(slen);
1118         ir_type          *      elem_type;
1119         switch (value->encoding) {
1120         case STRING_ENCODING_CHAR:
1121         case STRING_ENCODING_UTF8: {
1122                 elem_type = ir_type_char;
1123
1124                 ir_mode *const mode = get_type_mode(elem_type);
1125                 char const    *p    = value->begin;
1126                 for (size_t i = 0; i < slen; ++i) {
1127                         ir_tarval        *tv  = new_tarval_from_long(*p++, mode);
1128                         ir_initializer_t *val = create_initializer_tarval(tv);
1129                         set_initializer_compound_value(initializer, i, val);
1130                 }
1131                 goto finish;
1132         }
1133
1134         {
1135                 type_t *type;
1136         case STRING_ENCODING_CHAR16: type = type_char16_t; goto init_wide;
1137         case STRING_ENCODING_CHAR32: type = type_char32_t; goto init_wide;
1138         case STRING_ENCODING_WIDE:   type = type_wchar_t;  goto init_wide;
1139 init_wide:;
1140                 elem_type = get_ir_type(type);
1141
1142                 ir_mode *const mode = get_type_mode(elem_type);
1143                 char const    *p    = value->begin;
1144                 for (size_t i = 0; i < slen; ++i) {
1145                         assert(p <= value->begin + value->size);
1146                         utf32             v   = read_utf8_char(&p);
1147                         ir_tarval        *tv  = new_tarval_from_long(v, mode);
1148                         ir_initializer_t *val = create_initializer_tarval(tv);
1149                         set_initializer_compound_value(initializer, i, val);
1150                 }
1151                 goto finish;
1152         }
1153         }
1154         panic("invalid string encoding");
1155
1156 finish:;
1157         ir_type *const type = new_type_array(1, elem_type);
1158         set_array_bounds_int(type, 0, 0, slen);
1159         set_type_size_bytes( type, slen * get_type_size_bytes(elem_type));
1160         set_type_state(      type, layout_fixed);
1161
1162         ir_type   *const global_type = get_glob_type();
1163         ident     *const id          = id_unique(id_prefix);
1164         dbg_info  *const dbgi        = get_dbg_info(src_pos);
1165         ir_entity *const entity      = new_d_entity(global_type, id, type, dbgi);
1166         set_entity_ld_ident(   entity, id);
1167         set_entity_visibility( entity, ir_visibility_private);
1168         add_entity_linkage(    entity, IR_LINKAGE_CONSTANT);
1169         set_entity_initializer(entity, initializer);
1170
1171         return create_symconst(dbgi, entity);
1172 }
1173
1174 static bool try_create_integer(literal_expression_t *literal, type_t *type)
1175 {
1176         assert(type->kind == TYPE_ATOMIC);
1177         atomic_type_kind_t akind = type->atomic.akind;
1178
1179         ir_mode    *const mode = atomic_modes[akind];
1180         char const *const str  = literal->value.begin;
1181         ir_tarval  *const tv   = new_tarval_from_str(str, literal->suffix - str, mode);
1182         if (tv == tarval_bad)
1183                 return false;
1184
1185         literal->base.type    = type;
1186         literal->target_value = tv;
1187         return true;
1188 }
1189
1190 void determine_literal_type(literal_expression_t *const literal)
1191 {
1192         assert(literal->base.kind == EXPR_LITERAL_INTEGER);
1193
1194         /* -1: signed only, 0: any, 1: unsigned only */
1195         int const sign =
1196                 !is_type_signed(literal->base.type) ? 1 :
1197                 literal->value.begin[0] == '0'      ? 0 :
1198                 -1; /* Decimal literals only try signed types. */
1199
1200         tarval_int_overflow_mode_t old_mode = tarval_get_integer_overflow_mode();
1201         tarval_set_integer_overflow_mode(TV_OVERFLOW_BAD);
1202
1203         if (try_create_integer(literal, literal->base.type))
1204                 goto finished;
1205
1206         /* now try if the constant is small enough for some types */
1207         if (sign >= 0 && try_create_integer(literal, type_unsigned_int))
1208                 goto finished;
1209         if (sign <= 0 && try_create_integer(literal, type_long))
1210                 goto finished;
1211         if (sign >= 0 && try_create_integer(literal, type_unsigned_long))
1212                 goto finished;
1213         /* last try? then we should not report tarval_bad */
1214         if (sign < 0)
1215                 tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
1216         if (sign <= 0 && try_create_integer(literal, type_long_long))
1217                 goto finished;
1218
1219         /* last try */
1220         assert(sign >= 0);
1221         tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
1222         bool res = try_create_integer(literal, type_unsigned_long_long);
1223         if (!res)
1224                 panic("internal error when parsing number literal");
1225
1226 finished:
1227         tarval_set_integer_overflow_mode(old_mode);
1228 }
1229
1230 /**
1231  * Creates a Const node representing a constant.
1232  */
1233 static ir_node *literal_to_firm(const literal_expression_t *literal)
1234 {
1235         type_t     *type   = skip_typeref(literal->base.type);
1236         ir_mode    *mode   = get_ir_mode_storage(type);
1237         const char *string = literal->value.begin;
1238         size_t      size   = literal->value.size;
1239         ir_tarval  *tv;
1240
1241         switch (literal->base.kind) {
1242         case EXPR_LITERAL_INTEGER:
1243                 assert(literal->target_value != NULL);
1244                 tv = literal->target_value;
1245                 break;
1246
1247         case EXPR_LITERAL_FLOATINGPOINT:
1248                 tv = new_tarval_from_str(string, size, mode);
1249                 break;
1250
1251         case EXPR_LITERAL_BOOLEAN:
1252                 if (string[0] == 't') {
1253                         tv = get_mode_one(mode);
1254                 } else {
1255                         assert(string[0] == 'f');
1256         case EXPR_LITERAL_MS_NOOP:
1257                         tv = get_mode_null(mode);
1258                 }
1259                 break;
1260
1261         default:
1262                 panic("invalid literal kind");
1263         }
1264
1265         dbg_info *const dbgi = get_dbg_info(&literal->base.pos);
1266         return new_d_Const(dbgi, tv);
1267 }
1268
1269 /**
1270  * Creates a Const node representing a character constant.
1271  */
1272 static ir_node *char_literal_to_firm(string_literal_expression_t const *literal)
1273 {
1274         type_t     *type   = skip_typeref(literal->base.type);
1275         ir_mode    *mode   = get_ir_mode_storage(type);
1276         const char *string = literal->value.begin;
1277         size_t      size   = literal->value.size;
1278         ir_tarval  *tv;
1279
1280         switch (literal->value.encoding) {
1281         case STRING_ENCODING_WIDE: {
1282                 utf32  v = read_utf8_char(&string);
1283                 char   buf[128];
1284                 size_t len = snprintf(buf, sizeof(buf), UTF32_PRINTF_FORMAT, v);
1285
1286                 tv = new_tarval_from_str(buf, len, mode);
1287                 break;
1288         }
1289
1290         case STRING_ENCODING_CHAR: {
1291                 long long int v;
1292                 bool char_is_signed
1293                         = get_atomic_type_flags(ATOMIC_TYPE_CHAR) & ATOMIC_TYPE_FLAG_SIGNED;
1294                 if (size == 1 && char_is_signed) {
1295                         v = (signed char)string[0];
1296                 } else {
1297                         v = 0;
1298                         for (size_t i = 0; i < size; ++i) {
1299                                 v = (v << 8) | ((unsigned char)string[i]);
1300                         }
1301                 }
1302                 char   buf[128];
1303                 size_t len = snprintf(buf, sizeof(buf), "%lld", v);
1304
1305                 tv = new_tarval_from_str(buf, len, mode);
1306                 break;
1307         }
1308
1309         default:
1310                 panic("invalid literal kind");
1311         }
1312
1313         dbg_info *const dbgi = get_dbg_info(&literal->base.pos);
1314         return new_d_Const(dbgi, tv);
1315 }
1316
1317 /*
1318  * Allocate an area of size bytes aligned at alignment
1319  * at a frame type.
1320  */
1321 static ir_entity *alloc_trampoline(ir_type *frame_type, int size, unsigned alignment)
1322 {
1323         static unsigned area_cnt = 0;
1324         char buf[32];
1325
1326         ir_type *tp = new_type_array(1, ir_type_char);
1327         set_array_bounds_int(tp, 0, 0, size);
1328         set_type_alignment_bytes(tp, alignment);
1329
1330         snprintf(buf, sizeof(buf), "trampolin%u", area_cnt++);
1331         ident *name = new_id_from_str(buf);
1332         ir_entity *area = new_entity(frame_type, name, tp);
1333
1334         /* mark this entity as compiler generated */
1335         set_entity_compiler_generated(area, 1);
1336         return area;
1337 }
1338
1339 /**
1340  * Return a node representing a trampoline region
1341  * for a given function entity.
1342  *
1343  * @param dbgi    debug info
1344  * @param entity  the function entity
1345  */
1346 static ir_node *get_trampoline_region(dbg_info *dbgi, ir_entity *entity)
1347 {
1348         ir_entity *region = NULL;
1349         int        i;
1350
1351         if (current_trampolines != NULL) {
1352                 for (i = ARR_LEN(current_trampolines) - 1; i >= 0; --i) {
1353                         if (current_trampolines[i].function == entity) {
1354                                 region = current_trampolines[i].region;
1355                                 break;
1356                         }
1357                 }
1358         } else {
1359                 current_trampolines = NEW_ARR_F(trampoline_region, 0);
1360         }
1361         ir_graph *irg = current_ir_graph;
1362         if (region == NULL) {
1363                 /* create a new region */
1364                 ir_type           *frame_tp = get_irg_frame_type(irg);
1365                 trampoline_region  reg;
1366                 reg.function = entity;
1367
1368                 reg.region   = alloc_trampoline(frame_tp,
1369                                                 be_params->trampoline_size,
1370                                                 be_params->trampoline_align);
1371                 ARR_APP1(trampoline_region, current_trampolines, reg);
1372                 region = reg.region;
1373         }
1374         return new_d_simpleSel(dbgi, get_irg_no_mem(irg), get_irg_frame(irg),
1375                                region);
1376 }
1377
1378 /**
1379  * Creates a trampoline for a function represented by an entity.
1380  *
1381  * @param dbgi    debug info
1382  * @param mode    the (reference) mode for the function address
1383  * @param entity  the function entity
1384  */
1385 static ir_node *create_trampoline(dbg_info *dbgi, ir_mode *mode,
1386                                   ir_entity *entity)
1387 {
1388         assert(entity != NULL);
1389         ir_node *in[3];
1390         in[0] = get_trampoline_region(dbgi, entity);
1391         in[1] = create_symconst(dbgi, entity);
1392         in[2] = get_irg_frame(current_ir_graph);
1393
1394         ir_node *irn = new_d_Builtin(dbgi, get_store(), 3, in, ir_bk_inner_trampoline, get_unknown_type());
1395         set_store(new_Proj(irn, mode_M, pn_Builtin_M));
1396         return new_Proj(irn, mode, pn_Builtin_max+1);
1397 }
1398
1399 /**
1400  * Dereference an address.
1401  *
1402  * @param dbgi  debug info
1403  * @param type  the type of the dereferenced result (the points_to type)
1404  * @param addr  the address to dereference
1405  */
1406 static ir_node *deref_address(dbg_info *const dbgi, type_t *const type,
1407                                       ir_node *const addr)
1408 {
1409         type_t *skipped = skip_typeref(type);
1410         if (is_type_incomplete(skipped))
1411                 return addr;
1412
1413         ir_type *irtype = get_ir_type(skipped);
1414         if (is_compound_type(irtype)
1415             || is_Method_type(irtype)
1416             || is_Array_type(irtype)) {
1417                 return addr;
1418         }
1419
1420         ir_cons_flags  flags    = skipped->base.qualifiers & TYPE_QUALIFIER_VOLATILE
1421                                   ? cons_volatile : cons_none;
1422         ir_mode *const mode     = get_type_mode(irtype);
1423         ir_node *const memory   = get_store();
1424         ir_node *const load     = new_d_Load(dbgi, memory, addr, mode, flags);
1425         ir_node *const load_mem = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1426         ir_node *const load_res = new_d_Proj(dbgi, load, mode,   pn_Load_res);
1427
1428         set_store(load_mem);
1429         return load_res;
1430 }
1431
1432 /**
1433  * Returns the correct base address depending on whether it is a parameter or a
1434  * normal local variable.
1435  */
1436 static ir_node *get_local_frame(ir_entity *const ent)
1437 {
1438         ir_graph      *const irg   = current_ir_graph;
1439         const ir_type *const owner = get_entity_owner(ent);
1440         if (owner == current_outer_frame) {
1441                 assert(current_static_link != NULL);
1442                 return current_static_link;
1443         } else {
1444                 return get_irg_frame(irg);
1445         }
1446 }
1447
1448 /**
1449  * Keep the current block and memory.
1450  * This is necessary for all loops, because they could become infinite.
1451  */
1452 static void keep_loop(void)
1453 {
1454         keep_alive(get_cur_block());
1455         keep_alive(get_store());
1456 }
1457
1458 static ir_node *enum_constant_to_firm(reference_expression_t const *const ref)
1459 {
1460         entity_t *entity = ref->entity;
1461         if (entity->enum_value.tv == NULL) {
1462                 type_t *type = skip_typeref(entity->enum_value.enum_type);
1463                 assert(type->kind == TYPE_ENUM);
1464                 determine_enum_values(&type->enumt);
1465         }
1466
1467         return new_Const(entity->enum_value.tv);
1468 }
1469
1470 static ir_node *reference_addr(const reference_expression_t *ref)
1471 {
1472         dbg_info *dbgi   = get_dbg_info(&ref->base.pos);
1473         entity_t *entity = ref->entity;
1474         assert(is_declaration(entity));
1475
1476         if (entity->kind == ENTITY_FUNCTION
1477             && entity->function.btk != BUILTIN_NONE) {
1478                 ir_entity *irentity = get_function_entity(entity, NULL);
1479                 /* for gcc compatibility we have to produce (dummy) addresses for some
1480                  * builtins which don't have entities */
1481                 if (irentity == NULL) {
1482                         position_t const *const pos = &ref->base.pos;
1483                         warningf(WARN_OTHER, pos, "taking address of builtin '%N'", ref->entity);
1484
1485                         /* simply create a NULL pointer */
1486                         ir_mode *const mode = get_ir_mode_storage(type_void_ptr);
1487                         return new_Const(get_mode_null(mode));
1488                 }
1489         }
1490
1491         switch((declaration_kind_t) entity->declaration.kind) {
1492         case DECLARATION_KIND_UNKNOWN:
1493                 break;
1494         case DECLARATION_KIND_PARAMETER:
1495         case DECLARATION_KIND_LOCAL_VARIABLE:
1496                 /* you can store to a local variable (so we don't panic but return NULL
1497                  * as an indicator for no real address) */
1498                 return NULL;
1499         case DECLARATION_KIND_GLOBAL_VARIABLE: {
1500                 ir_node *const addr = create_symconst(dbgi, entity->variable.v.entity);
1501                 return addr;
1502         }
1503
1504         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY:
1505         case DECLARATION_KIND_PARAMETER_ENTITY: {
1506                 ir_entity *irentity = entity->variable.v.entity;
1507                 ir_node   *frame    = get_local_frame(irentity);
1508                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1509                 return sel;
1510         }
1511
1512         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
1513                 return entity->variable.v.vla_base;
1514
1515         case DECLARATION_KIND_FUNCTION: {
1516                 return create_symconst(dbgi, entity->function.irentity);
1517         }
1518
1519         case DECLARATION_KIND_INNER_FUNCTION: {
1520                 type_t  *const type = skip_typeref(entity->declaration.type);
1521                 ir_mode *const mode = get_ir_mode_storage(type);
1522                 if (!entity->function.goto_to_outer && !entity->function.need_closure) {
1523                         /* inner function not using the closure */
1524                         return create_symconst(dbgi, entity->function.irentity);
1525                 } else {
1526                         /* need trampoline here */
1527                         return create_trampoline(dbgi, mode, entity->function.irentity);
1528                 }
1529         }
1530
1531         case DECLARATION_KIND_COMPOUND_MEMBER:
1532                 panic("not implemented reference type");
1533         }
1534
1535         panic("reference to declaration with unknown type");
1536 }
1537
1538 static ir_node *reference_expression_to_firm(const reference_expression_t *ref)
1539 {
1540         dbg_info *const dbgi   = get_dbg_info(&ref->base.pos);
1541         entity_t *const entity = ref->entity;
1542         assert(is_declaration(entity));
1543
1544         switch ((declaration_kind_t)entity->declaration.kind) {
1545         case DECLARATION_KIND_LOCAL_VARIABLE:
1546         case DECLARATION_KIND_PARAMETER: {
1547                 type_t  *const type  = skip_typeref(entity->declaration.type);
1548                 ir_mode *const mode  = get_ir_mode_storage(type);
1549                 return get_value(entity->variable.v.value_number, mode);
1550         }
1551
1552         default: {
1553                 ir_node *const addr = reference_addr(ref);
1554                 return deref_address(dbgi, entity->declaration.type, addr);
1555         }
1556         }
1557 }
1558
1559 /**
1560  * Transform calls to builtin functions.
1561  */
1562 static ir_node *process_builtin_call(const call_expression_t *call)
1563 {
1564         dbg_info *dbgi = get_dbg_info(&call->base.pos);
1565
1566         assert(call->function->kind == EXPR_REFERENCE);
1567         reference_expression_t *builtin = &call->function->reference;
1568
1569         type_t *expr_type = skip_typeref(builtin->base.type);
1570         assert(is_type_pointer(expr_type));
1571
1572         type_t *function_type = skip_typeref(expr_type->pointer.points_to);
1573
1574         switch (builtin->entity->function.btk) {
1575         case BUILTIN_NONE:
1576                 break;
1577         case BUILTIN_ALLOCA: {
1578                 expression_t *argument = call->arguments->expression;
1579                 ir_node      *size     = expression_to_value(argument);
1580
1581                 ir_node *store  = get_store();
1582                 ir_node *alloca = new_d_Alloc(dbgi, store, size, get_unknown_type(),
1583                                               stack_alloc);
1584                 ir_node *proj_m = new_Proj(alloca, mode_M, pn_Alloc_M);
1585                 set_store(proj_m);
1586                 ir_node *res    = new_Proj(alloca, mode_P_data, pn_Alloc_res);
1587
1588                 return res;
1589         }
1590         case BUILTIN_INF: {
1591                 type_t    *type = function_type->function.return_type;
1592                 ir_mode   *mode = get_ir_mode_storage(type);
1593                 ir_tarval *tv   = get_mode_infinite(mode);
1594                 ir_node   *res  = new_d_Const(dbgi, tv);
1595                 return res;
1596         }
1597         case BUILTIN_NAN: {
1598                 /* Ignore string for now... */
1599                 assert(is_type_function(function_type));
1600                 type_t    *type = function_type->function.return_type;
1601                 ir_mode   *mode = get_ir_mode_storage(type);
1602                 ir_tarval *tv   = get_mode_NAN(mode);
1603                 ir_node   *res  = new_d_Const(dbgi, tv);
1604                 return res;
1605         }
1606         case BUILTIN_EXPECT: {
1607                 expression_t *argument = call->arguments->expression;
1608                 return expression_to_value(argument);
1609         }
1610         case BUILTIN_VA_END:
1611                 /* evaluate the argument of va_end for its side effects */
1612                 expression_to_value(call->arguments->expression);
1613                 return NULL;
1614         case BUILTIN_OBJECT_SIZE: {
1615                 /* determine value of "type" */
1616                 expression_t *type_expression = call->arguments->next->expression;
1617                 long          type_val        = fold_constant_to_int(type_expression);
1618                 type_t       *type            = function_type->function.return_type;
1619                 ir_mode      *mode            = get_ir_mode_storage(type);
1620                 /* just produce a "I don't know" result */
1621                 ir_tarval    *result          = type_val & 2 ? get_mode_null(mode) :
1622                                                 get_mode_minus_one(mode);
1623
1624                 return new_d_Const(dbgi, result);
1625         }
1626         case BUILTIN_ROTL: {
1627                 ir_node *val  = expression_to_value(call->arguments->expression);
1628                 ir_node *shf  = expression_to_value(call->arguments->next->expression);
1629                 ir_mode *mode = get_irn_mode(val);
1630                 ir_mode *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1631                 return new_d_Rotl(dbgi, val, create_conv(dbgi, shf, mode_uint), mode);
1632         }
1633         case BUILTIN_ROTR: {
1634                 ir_node *val  = expression_to_value(call->arguments->expression);
1635                 ir_node *shf  = expression_to_value(call->arguments->next->expression);
1636                 ir_mode *mode = get_irn_mode(val);
1637                 ir_mode *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1638                 ir_node *c    = new_Const_long(mode_uint, get_mode_size_bits(mode));
1639                 ir_node *sub  = new_d_Sub(dbgi, c, create_conv(dbgi, shf, mode_uint), mode_uint);
1640                 return new_d_Rotl(dbgi, val, sub, mode);
1641         }
1642         case BUILTIN_FIRM:
1643                 break;
1644         case BUILTIN_LIBC:
1645         case BUILTIN_LIBC_CHECK:
1646                 panic("builtin did not produce an entity");
1647         }
1648         panic("invalid builtin");
1649 }
1650
1651 /**
1652  * Transform a call expression.
1653  * Handles some special cases, like alloca() calls, which must be resolved
1654  * BEFORE the inlines runs. Inlining routines calling alloca() is dangerous,
1655  * 176.gcc for instance might allocate 2GB instead of 256 MB if alloca is not
1656  * handled right...
1657  */
1658 static ir_node *call_expression_to_firm(const call_expression_t *const call)
1659 {
1660         dbg_info *const dbgi = get_dbg_info(&call->base.pos);
1661         assert(currently_reachable());
1662
1663         expression_t   *function = call->function;
1664         ir_node        *callee   = NULL;
1665         bool            firm_builtin = false;
1666         ir_builtin_kind firm_builtin_kind = ir_bk_trap;
1667         if (function->kind == EXPR_REFERENCE) {
1668                 const reference_expression_t *ref    = &function->reference;
1669                 entity_t                     *entity = ref->entity;
1670
1671                 if (entity->kind == ENTITY_FUNCTION) {
1672                         builtin_kind_t builtin = entity->function.btk;
1673                         if (builtin == BUILTIN_FIRM) {
1674                                 firm_builtin = true;
1675                                 firm_builtin_kind = entity->function.b.firm_builtin_kind;
1676                         } else if (builtin != BUILTIN_NONE && builtin != BUILTIN_LIBC
1677                                    && builtin != BUILTIN_LIBC_CHECK) {
1678                                 return process_builtin_call(call);
1679                         }
1680                 }
1681         }
1682         if (!firm_builtin)
1683                 callee = expression_to_value(function);
1684
1685         type_t *type = skip_typeref(function->base.type);
1686         assert(is_type_pointer(type));
1687         pointer_type_t *pointer_type = &type->pointer;
1688         type_t         *points_to    = skip_typeref(pointer_type->points_to);
1689         assert(is_type_function(points_to));
1690         function_type_t *function_type = &points_to->function;
1691
1692         int      n_parameters    = 0;
1693         ir_type *ir_method_type  = get_ir_type((type_t*) function_type);
1694         ir_type *new_method_type = NULL;
1695         if (function_type->variadic || function_type->unspecified_parameters) {
1696                 const call_argument_t *argument = call->arguments;
1697                 for ( ; argument != NULL; argument = argument->next) {
1698                         ++n_parameters;
1699                 }
1700
1701                 /* we need to construct a new method type matching the call
1702                  * arguments... */
1703                 type_dbg_info *tdbgi = get_type_dbg_info_((const type_t*) function_type);
1704                 int n_res       = get_method_n_ress(ir_method_type);
1705                 new_method_type = new_d_type_method(n_parameters, n_res, tdbgi);
1706                 set_method_calling_convention(new_method_type,
1707                                get_method_calling_convention(ir_method_type));
1708                 set_method_additional_properties(new_method_type,
1709                                get_method_additional_properties(ir_method_type));
1710                 set_method_variadicity(new_method_type,
1711                                        get_method_variadicity(ir_method_type));
1712
1713                 for (int i = 0; i < n_res; ++i) {
1714                         set_method_res_type(new_method_type, i,
1715                                             get_method_res_type(ir_method_type, i));
1716                 }
1717                 argument = call->arguments;
1718                 for (int i = 0; i < n_parameters; ++i, argument = argument->next) {
1719                         expression_t *expression = argument->expression;
1720                         ir_type      *irtype     = get_ir_type(expression->base.type);
1721                         set_method_param_type(new_method_type, i, irtype);
1722                 }
1723                 ir_method_type = new_method_type;
1724         } else {
1725                 n_parameters = get_method_n_params(ir_method_type);
1726         }
1727
1728         ir_node *in[n_parameters];
1729
1730         const call_argument_t *argument = call->arguments;
1731         for (int n = 0; n < n_parameters; ++n) {
1732                 expression_t *expression = argument->expression;
1733                 ir_node      *arg_node   = expression_to_value(expression);
1734                 type_t       *arg_type   = skip_typeref(expression->base.type);
1735                 in[n] = conv_to_storage_type(dbgi, arg_node, arg_type);
1736
1737                 argument = argument->next;
1738         }
1739
1740         ir_node *store;
1741         if (function_type->modifiers & DM_CONST) {
1742                 store = get_irg_no_mem(current_ir_graph);
1743         } else {
1744                 store = get_store();
1745         }
1746
1747         ir_node *node;
1748         type_t  *return_type = skip_typeref(function_type->return_type);
1749         ir_node *result      = NULL;
1750         if (firm_builtin) {
1751                 node = new_d_Builtin(dbgi, store, n_parameters, in, firm_builtin_kind,
1752                                      ir_method_type);
1753                 if (! (function_type->modifiers & DM_CONST)) {
1754                         ir_node *mem = new_Proj(node, mode_M, pn_Builtin_M);
1755                         set_store(mem);
1756                 }
1757
1758                 if (!is_type_void(return_type)) {
1759                         assert(is_type_scalar(return_type));
1760                         ir_mode *mode = get_ir_mode_storage(return_type);
1761                         result = new_Proj(node, mode, pn_Builtin_max+1);
1762                 }
1763         } else {
1764                 node = new_d_Call(dbgi, store, callee, n_parameters, in, ir_method_type);
1765                 if (! (function_type->modifiers & DM_CONST)) {
1766                         ir_node *mem = new_Proj(node, mode_M, pn_Call_M);
1767                         set_store(mem);
1768                 }
1769
1770                 if (!is_type_void(return_type)) {
1771                         ir_node *const resproj = new_Proj(node, mode_T, pn_Call_T_result);
1772                         ir_mode *const mode    = get_ir_mode_storage(return_type);
1773                         result = new_Proj(resproj, mode, 0);
1774                 }
1775         }
1776
1777         if (function_type->modifiers & DM_NORETURN) {
1778                 /* A dead end:  Keep the Call and the Block.  Also place all further
1779                  * nodes into a new and unreachable block. */
1780                 keep_alive(node);
1781                 keep_alive(get_cur_block());
1782                 ir_node *block = new_Block(0, NULL);
1783                 set_cur_block(block);
1784         }
1785
1786         return result;
1787 }
1788
1789 static ir_node *statement_to_firm(statement_t *statement);
1790 static ir_node *compound_statement_to_firm(compound_statement_t *compound);
1791 static ir_node *expression_to_addr(const expression_t *expression);
1792
1793 static void assign_value(dbg_info *dbgi, ir_node *addr, type_t *type,
1794                          ir_node *value)
1795 {
1796         value = conv_to_storage_type(dbgi, value, type);
1797
1798         ir_node *memory = get_store();
1799
1800         if (is_type_scalar(type)) {
1801                 ir_cons_flags flags = type->base.qualifiers & TYPE_QUALIFIER_VOLATILE
1802                                       ? cons_volatile : cons_none;
1803                 ir_node  *store     = new_d_Store(dbgi, memory, addr, value, flags);
1804                 ir_node  *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
1805                 set_store(store_mem);
1806         } else {
1807                 ir_type *irtype    = get_ir_type(type);
1808                 ir_node *copyb     = new_d_CopyB(dbgi, memory, addr, value, irtype);
1809                 ir_node *copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
1810                 set_store(copyb_mem);
1811         }
1812 }
1813
1814 static ir_tarval *create_bitfield_mask(ir_mode *mode, int offset, int size)
1815 {
1816         ir_tarval *all_one   = get_mode_all_one(mode);
1817         int        mode_size = get_mode_size_bits(mode);
1818         ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1819
1820         assert(offset >= 0);
1821         assert(size   >= 0);
1822         assert(offset + size <= mode_size);
1823         if (size == mode_size) {
1824                 return all_one;
1825         }
1826
1827         long       shiftr    = get_mode_size_bits(mode) - size;
1828         long       shiftl    = offset;
1829         ir_tarval *tv_shiftr = new_tarval_from_long(shiftr, mode_uint);
1830         ir_tarval *tv_shiftl = new_tarval_from_long(shiftl, mode_uint);
1831         ir_tarval *mask0     = tarval_shr(all_one, tv_shiftr);
1832         ir_tarval *mask1     = tarval_shl(mask0, tv_shiftl);
1833
1834         return mask1;
1835 }
1836
1837 static ir_node *bitfield_store_to_firm(dbg_info *dbgi,
1838                 ir_entity *entity, ir_node *addr, ir_node *value, bool set_volatile,
1839                 bool need_return)
1840 {
1841         ir_type *entity_type = get_entity_type(entity);
1842         ir_type *base_type   = get_primitive_base_type(entity_type);
1843         ir_mode *mode        = get_type_mode(base_type);
1844         ir_mode *mode_uint   = atomic_modes[ATOMIC_TYPE_UINT];
1845
1846         value = create_conv(dbgi, value, mode);
1847
1848         /* kill upper bits of value and shift to right position */
1849         unsigned  bitoffset  = get_entity_offset_bits_remainder(entity);
1850         unsigned  bitsize    = get_mode_size_bits(get_type_mode(entity_type));
1851         unsigned  base_bits  = get_mode_size_bits(mode);
1852         unsigned  shiftwidth = base_bits - bitsize;
1853
1854         ir_node  *shiftcount = new_Const_long(mode_uint, shiftwidth);
1855         ir_node  *shiftl     = new_d_Shl(dbgi, value, shiftcount, mode);
1856
1857         unsigned  shrwidth   = base_bits - bitsize - bitoffset;
1858         ir_node  *shrconst   = new_Const_long(mode_uint, shrwidth);
1859         ir_node  *shiftr     = new_d_Shr(dbgi, shiftl, shrconst, mode);
1860
1861         /* load current value */
1862         ir_node   *mem             = get_store();
1863         ir_node   *load            = new_d_Load(dbgi, mem, addr, mode,
1864                                           set_volatile ? cons_volatile : cons_none);
1865         ir_node   *load_mem        = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1866         ir_node   *load_res        = new_d_Proj(dbgi, load, mode, pn_Load_res);
1867         ir_tarval *shift_mask      = create_bitfield_mask(mode, bitoffset, bitsize);
1868         ir_tarval *inv_mask        = tarval_not(shift_mask);
1869         ir_node   *inv_mask_node   = new_d_Const(dbgi, inv_mask);
1870         ir_node   *load_res_masked = new_d_And(dbgi, load_res, inv_mask_node, mode);
1871
1872         /* construct new value and store */
1873         ir_node *new_val   = new_d_Or(dbgi, load_res_masked, shiftr, mode);
1874         ir_node *store     = new_d_Store(dbgi, load_mem, addr, new_val,
1875                                          set_volatile ? cons_volatile : cons_none);
1876         ir_node *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
1877         set_store(store_mem);
1878
1879         if (!need_return)
1880                 return NULL;
1881
1882         ir_node *res_shr;
1883         ir_node *count_res_shr = new_Const_long(mode_uint, base_bits - bitsize);
1884         if (mode_is_signed(mode)) {
1885                 res_shr = new_d_Shrs(dbgi, shiftl, count_res_shr, mode);
1886         } else {
1887                 res_shr = new_d_Shr(dbgi, shiftl, count_res_shr, mode);
1888         }
1889         return res_shr;
1890 }
1891
1892 static ir_node *bitfield_extract_to_firm(const select_expression_t *expression,
1893                                          ir_node *addr)
1894 {
1895         dbg_info *dbgi      = get_dbg_info(&expression->base.pos);
1896         entity_t *entity    = expression->compound_entry;
1897         type_t   *base_type = entity->declaration.type;
1898         ir_mode  *mode      = get_ir_mode_storage(base_type);
1899         ir_node  *mem       = get_store();
1900         ir_node  *load      = new_d_Load(dbgi, mem, addr, mode, cons_none);
1901         ir_node  *load_mem  = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1902         ir_node  *load_res  = new_d_Proj(dbgi, load, mode, pn_Load_res);
1903         ir_mode  *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
1904
1905         ir_mode  *amode     = mode;
1906         /* optimisation, since shifting in modes < machine_size is usually
1907          * less efficient */
1908         if (get_mode_size_bits(amode) < get_mode_size_bits(mode_uint)) {
1909                 amode = mode_uint;
1910         }
1911         unsigned amode_size = get_mode_size_bits(amode);
1912         load_res = create_conv(dbgi, load_res, amode);
1913
1914         set_store(load_mem);
1915
1916         /* kill upper bits */
1917         assert(expression->compound_entry->kind == ENTITY_COMPOUND_MEMBER);
1918         unsigned   bitoffset   = entity->compound_member.bit_offset;
1919         unsigned   bitsize     = entity->compound_member.bit_size;
1920         unsigned   shift_bitsl = amode_size - bitoffset - bitsize;
1921         ir_tarval *tvl         = new_tarval_from_long((long)shift_bitsl, mode_uint);
1922         ir_node   *countl      = new_d_Const(dbgi, tvl);
1923         ir_node   *shiftl      = new_d_Shl(dbgi, load_res, countl, amode);
1924
1925         unsigned   shift_bitsr = bitoffset + shift_bitsl;
1926         assert(shift_bitsr <= amode_size);
1927         ir_tarval *tvr         = new_tarval_from_long((long)shift_bitsr, mode_uint);
1928         ir_node   *countr      = new_d_Const(dbgi, tvr);
1929         ir_node   *shiftr;
1930         if (mode_is_signed(mode)) {
1931                 shiftr = new_d_Shrs(dbgi, shiftl, countr, amode);
1932         } else {
1933                 shiftr = new_d_Shr(dbgi, shiftl, countr, amode);
1934         }
1935
1936         return conv_to_storage_type(dbgi, shiftr, expression->base.type);
1937 }
1938
1939 /* make sure the selected compound type is constructed */
1940 static void construct_select_compound(const select_expression_t *expression)
1941 {
1942         type_t *type = skip_typeref(expression->compound->base.type);
1943         if (is_type_pointer(type)) {
1944                 type = type->pointer.points_to;
1945         }
1946         (void) get_ir_type(type);
1947 }
1948
1949 static ir_node *set_value_for_expression_addr(const expression_t *expression,
1950                                               ir_node *value, ir_node *addr)
1951 {
1952         dbg_info *dbgi = get_dbg_info(&expression->base.pos);
1953         type_t   *type = skip_typeref(expression->base.type);
1954         value = conv_to_storage_type(dbgi, value, type);
1955
1956         if (expression->kind == EXPR_REFERENCE) {
1957                 const reference_expression_t *ref = &expression->reference;
1958
1959                 entity_t *entity = ref->entity;
1960                 assert(is_declaration(entity));
1961                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
1962                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE ||
1963                     entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
1964                         set_value(entity->variable.v.value_number, value);
1965                         return value;
1966                 }
1967         }
1968
1969         if (addr == NULL)
1970                 addr = expression_to_addr(expression);
1971         assert(addr != NULL);
1972
1973         if (expression->kind == EXPR_SELECT) {
1974                 const select_expression_t *select = &expression->select;
1975
1976                 construct_select_compound(select);
1977
1978                 entity_t *entity = select->compound_entry;
1979                 assert(entity->kind == ENTITY_COMPOUND_MEMBER);
1980                 if (entity->compound_member.bitfield) {
1981                         ir_entity *irentity = entity->compound_member.entity;
1982                         bool       set_volatile
1983                                 = select->base.type->base.qualifiers & TYPE_QUALIFIER_VOLATILE;
1984                         value = bitfield_store_to_firm(dbgi, irentity, addr, value,
1985                                                        set_volatile, true);
1986                         return value;
1987                 }
1988         }
1989
1990         assign_value(dbgi, addr, type, value);
1991         return value;
1992 }
1993
1994 static ir_node *get_value_from_lvalue(const expression_t *expression,
1995                                       ir_node *addr)
1996 {
1997         if (expression->kind == EXPR_REFERENCE) {
1998                 const reference_expression_t *ref = &expression->reference;
1999
2000                 entity_t *entity = ref->entity;
2001                 assert(entity->kind == ENTITY_VARIABLE
2002                                 || entity->kind == ENTITY_PARAMETER);
2003                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2004                 int value_number;
2005                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE ||
2006                     entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
2007                         value_number = entity->variable.v.value_number;
2008                         assert(addr == NULL);
2009                         type_t  *type = skip_typeref(expression->base.type);
2010                         ir_mode *mode = get_ir_mode_storage(type);
2011                         return get_value(value_number, mode);
2012                 }
2013         }
2014
2015         assert(addr != NULL);
2016         dbg_info *dbgi = get_dbg_info(&expression->base.pos);
2017
2018         ir_node *value;
2019         if (expression->kind == EXPR_SELECT &&
2020             expression->select.compound_entry->compound_member.bitfield) {
2021             construct_select_compound(&expression->select);
2022                 value = bitfield_extract_to_firm(&expression->select, addr);
2023         } else {
2024                 value = deref_address(dbgi, expression->base.type, addr);
2025         }
2026
2027         return value;
2028 }
2029
2030 static ir_node *incdec_to_firm(unary_expression_t const *const expr, bool const inc, bool const pre)
2031 {
2032         type_t  *const type = skip_typeref(expr->base.type);
2033         ir_mode *const mode = get_ir_mode_arithmetic(type);
2034
2035         ir_node *offset;
2036         if (is_type_pointer(type)) {
2037                 offset = get_type_size_node(type->pointer.points_to);
2038         } else {
2039                 assert(is_type_arithmetic(type));
2040                 offset = new_Const(get_mode_one(mode));
2041         }
2042
2043         dbg_info           *const dbgi        = get_dbg_info(&expr->base.pos);
2044         expression_t const *const value_expr  = expr->value;
2045         ir_node            *const addr        = expression_to_addr(value_expr);
2046         ir_node            *const value       = get_value_from_lvalue(value_expr, addr);
2047         ir_node            *const value_arith = create_conv(dbgi, value, mode);
2048         ir_node            *const new_value   = inc
2049                 ? new_d_Add(dbgi, value_arith, offset, mode)
2050                 : new_d_Sub(dbgi, value_arith, offset, mode);
2051
2052         ir_node *const store_value = set_value_for_expression_addr(value_expr, new_value, addr);
2053         return pre ? store_value : value;
2054 }
2055
2056 static bool is_local_variable(expression_t *expression)
2057 {
2058         if (expression->kind != EXPR_REFERENCE)
2059                 return false;
2060         reference_expression_t *ref_expr = &expression->reference;
2061         entity_t               *entity   = ref_expr->entity;
2062         if (entity->kind != ENTITY_VARIABLE)
2063                 return false;
2064         assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2065         return entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE;
2066 }
2067
2068 static ir_relation get_relation(const expression_kind_t kind)
2069 {
2070         switch(kind) {
2071         case EXPR_BINARY_EQUAL:         return ir_relation_equal;
2072         case EXPR_BINARY_ISLESSGREATER: return ir_relation_less_greater;
2073         case EXPR_BINARY_NOTEQUAL:      return ir_relation_unordered_less_greater;
2074         case EXPR_BINARY_ISLESS:
2075         case EXPR_BINARY_LESS:          return ir_relation_less;
2076         case EXPR_BINARY_ISLESSEQUAL:
2077         case EXPR_BINARY_LESSEQUAL:     return ir_relation_less_equal;
2078         case EXPR_BINARY_ISGREATER:
2079         case EXPR_BINARY_GREATER:       return ir_relation_greater;
2080         case EXPR_BINARY_ISGREATEREQUAL:
2081         case EXPR_BINARY_GREATEREQUAL:  return ir_relation_greater_equal;
2082         case EXPR_BINARY_ISUNORDERED:   return ir_relation_unordered;
2083
2084         default:
2085                 break;
2086         }
2087         panic("trying to get ir_relation from non-comparison binexpr type");
2088 }
2089
2090 /**
2091  * Handle the assume optimizer hint: check if a Confirm
2092  * node can be created.
2093  *
2094  * @param dbi    debug info
2095  * @param expr   the IL assume expression
2096  *
2097  * we support here only some simple cases:
2098  *  - var rel const
2099  *  - const rel val
2100  *  - var rel var
2101  */
2102 static ir_node *handle_assume_compare(dbg_info *dbi,
2103                                       const binary_expression_t *expression)
2104 {
2105         expression_t *op1 = expression->left;
2106         expression_t *op2 = expression->right;
2107         entity_t     *var2, *var = NULL;
2108         ir_node      *res      = NULL;
2109         ir_relation   relation = get_relation(expression->base.kind);
2110
2111         if (is_local_variable(op1) && is_local_variable(op2)) {
2112                 var  = op1->reference.entity;
2113             var2 = op2->reference.entity;
2114
2115                 type_t  *const type = skip_typeref(var->declaration.type);
2116                 ir_mode *const mode = get_ir_mode_storage(type);
2117
2118                 ir_node *const irn1 = get_value(var->variable.v.value_number, mode);
2119                 ir_node *const irn2 = get_value(var2->variable.v.value_number, mode);
2120
2121                 res = new_d_Confirm(dbi, irn2, irn1, get_inversed_relation(relation));
2122                 set_value(var2->variable.v.value_number, res);
2123
2124                 res = new_d_Confirm(dbi, irn1, irn2, relation);
2125                 set_value(var->variable.v.value_number, res);
2126
2127                 return res;
2128         }
2129
2130         expression_t *con = NULL;
2131         if (is_local_variable(op1) && is_constant_expression(op2) == EXPR_CLASS_CONSTANT) {
2132                 var = op1->reference.entity;
2133                 con = op2;
2134         } else if (is_constant_expression(op1) == EXPR_CLASS_CONSTANT && is_local_variable(op2)) {
2135                 relation = get_inversed_relation(relation);
2136                 var = op2->reference.entity;
2137                 con = op1;
2138         }
2139
2140         if (var != NULL) {
2141                 type_t  *const type = skip_typeref(var->declaration.type);
2142                 ir_mode *const mode = get_ir_mode_storage(type);
2143
2144                 res = get_value(var->variable.v.value_number, mode);
2145                 res = new_d_Confirm(dbi, res, expression_to_value(con), relation);
2146                 set_value(var->variable.v.value_number, res);
2147         }
2148         return res;
2149 }
2150
2151 /**
2152  * Handle the assume optimizer hint.
2153  *
2154  * @param dbi    debug info
2155  * @param expr   the IL assume expression
2156  */
2157 static ir_node *handle_assume(expression_t const *const expr)
2158 {
2159         switch (expr->kind) {
2160         case EXPR_BINARY_EQUAL:
2161         case EXPR_BINARY_NOTEQUAL:
2162         case EXPR_BINARY_LESS:
2163         case EXPR_BINARY_LESSEQUAL:
2164         case EXPR_BINARY_GREATER:
2165         case EXPR_BINARY_GREATEREQUAL: {
2166                 dbg_info *const dbgi = get_dbg_info(&expr->base.pos);
2167                 return handle_assume_compare(dbgi, &expr->binary);
2168         }
2169
2170         default:
2171                 return NULL;
2172         }
2173 }
2174
2175 static ir_node *create_cast(unary_expression_t const *const expr)
2176 {
2177         type_t *const type = skip_typeref(expr->base.type);
2178         if (is_type_void(type))
2179                 return NULL;
2180
2181         ir_node        *value     = expression_to_value(expr->value);
2182         dbg_info *const dbgi      = get_dbg_info(&expr->base.pos);
2183         type_t   *const from_type = skip_typeref(expr->value->base.type);
2184         ir_mode  *const mode      = get_ir_mode_storage(type);
2185         /* check for conversion from / to __based types */
2186         if (is_type_pointer(type) && is_type_pointer(from_type)) {
2187                 const variable_t *from_var = from_type->pointer.base_variable;
2188                 const variable_t *to_var   = type->pointer.base_variable;
2189                 if (from_var != to_var) {
2190                         if (from_var != NULL) {
2191                                 ir_node *const addr = create_symconst(dbgi, from_var->v.entity);
2192                                 ir_node *const base = deref_address(dbgi, from_var->base.type, addr);
2193                                 value = new_d_Add(dbgi, value, base, mode);
2194                         }
2195                         if (to_var != NULL) {
2196                                 ir_node *const addr = create_symconst(dbgi, to_var->v.entity);
2197                                 ir_node *const base = deref_address(dbgi, to_var->base.type, addr);
2198                                 value = new_d_Sub(dbgi, value, base, mode);
2199                         }
2200                 }
2201         }
2202
2203         return create_conv(dbgi, value, mode);
2204 }
2205
2206 static ir_node *complement_to_firm(unary_expression_t const *const expr)
2207 {
2208         dbg_info *const dbgi  = get_dbg_info(&expr->base.pos);
2209         type_t   *const type  = skip_typeref(expr->base.type);
2210         ir_mode  *const mode  = get_ir_mode_arithmetic(type);
2211         ir_node  *const value = create_conv(dbgi, expression_to_value(expr->value), mode);
2212         return new_d_Not(dbgi, value, mode);
2213 }
2214
2215 static ir_node *dereference_to_firm(unary_expression_t const *const expr)
2216 {
2217         dbg_info *const dbgi       = get_dbg_info(&expr->base.pos);
2218         ir_node        *value      = expression_to_value(expr->value);
2219         type_t   *const value_type = skip_typeref(expr->value->base.type);
2220         assert(is_type_pointer(value_type));
2221
2222         /* check for __based */
2223         variable_t const *const base_var = value_type->pointer.base_variable;
2224         if (base_var) {
2225                 ir_node *const addr = create_symconst(dbgi, base_var->v.entity);
2226                 ir_node *const base = deref_address(dbgi, base_var->base.type, addr);
2227                 value = new_d_Add(dbgi, value, base, get_ir_mode_storage(value_type));
2228         }
2229         type_t *const points_to = value_type->pointer.points_to;
2230         return deref_address(dbgi, points_to, value);
2231 }
2232
2233 static ir_node *negate_to_firm(unary_expression_t const *const expr)
2234 {
2235         dbg_info *const dbgi  = get_dbg_info(&expr->base.pos);
2236         type_t   *const type  = skip_typeref(expr->base.type);
2237         ir_mode  *const mode  = get_ir_mode_arithmetic(type);
2238         ir_node  *const value = create_conv(dbgi, expression_to_value(expr->value), mode);
2239         return new_d_Minus(dbgi, value, mode);
2240 }
2241
2242 static ir_node *adjust_for_pointer_arithmetic(dbg_info *dbgi,
2243                 ir_node *value, type_t *type)
2244 {
2245         ir_mode        *const mode         = get_ir_mode_storage(type_ptrdiff_t);
2246         assert(is_type_pointer(type));
2247         pointer_type_t *const pointer_type = &type->pointer;
2248         type_t         *const points_to    = skip_typeref(pointer_type->points_to);
2249         ir_node        *      elem_size    = get_type_size_node(points_to);
2250         elem_size                          = create_conv(dbgi, elem_size, mode);
2251         value                              = create_conv(dbgi, value,     mode);
2252         ir_node        *const mul          = new_d_Mul(dbgi, value, elem_size, mode);
2253         return mul;
2254 }
2255
2256 static ir_node *create_op(binary_expression_t const *const expr, ir_node *left, ir_node *right)
2257 {
2258         ir_mode                *mode;
2259         dbg_info         *const dbgi       = get_dbg_info(&expr->base.pos);
2260         type_t           *const type_left  = skip_typeref(expr->left->base.type);
2261         type_t           *const type_right = skip_typeref(expr->right->base.type);
2262         expression_kind_t const kind       = expr->base.kind;
2263         switch (kind) {
2264         case EXPR_BINARY_SHIFTLEFT:
2265         case EXPR_BINARY_SHIFTRIGHT:
2266         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2267         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2268                 mode  = get_ir_mode_arithmetic(expr->base.type);
2269                 left  = create_conv(dbgi, left,  mode);
2270                 right = create_conv(dbgi, right, atomic_modes[ATOMIC_TYPE_UINT]);
2271                 break;
2272
2273         case EXPR_BINARY_SUB:
2274                 if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
2275                         const pointer_type_t *const ptr_type = &type_left->pointer;
2276
2277                         mode = get_ir_mode_storage(expr->base.type);
2278                         ir_node *const elem_size = get_type_size_node(ptr_type->points_to);
2279                         ir_node *const conv_size = new_d_Conv(dbgi, elem_size, mode);
2280                         ir_node *const sub       = new_d_Sub(dbgi, left, right, mode);
2281                         ir_node *const no_mem    = new_NoMem();
2282                         ir_node *const div       = new_d_DivRL(dbgi, no_mem, sub, conv_size,
2283                                                                                                    mode, op_pin_state_floats);
2284                         return new_d_Proj(dbgi, div, mode, pn_Div_res);
2285                 }
2286                 /* fallthrough */
2287         case EXPR_BINARY_SUB_ASSIGN:
2288                 if (is_type_pointer(type_left)) {
2289                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2290                         mode  = get_ir_mode_storage(type_left);
2291                         break;
2292                 }
2293                 goto normal_node;
2294
2295         case EXPR_BINARY_ADD:
2296         case EXPR_BINARY_ADD_ASSIGN:
2297                 if (is_type_pointer(type_left)) {
2298                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2299                         mode  = get_ir_mode_storage(type_left);
2300                         break;
2301                 } else if (is_type_pointer(type_right)) {
2302                         left  = adjust_for_pointer_arithmetic(dbgi, left, type_right);
2303                         mode  = get_ir_mode_storage(type_right);
2304                         break;
2305                 }
2306                 goto normal_node;
2307
2308         default:
2309 normal_node:
2310                 mode  = get_ir_mode_arithmetic(type_right);
2311                 left  = create_conv(dbgi, left,  mode);
2312                 right = create_conv(dbgi, right, mode);
2313                 break;
2314         }
2315
2316         switch (kind) {
2317         case EXPR_BINARY_ADD_ASSIGN:
2318         case EXPR_BINARY_ADD:
2319                 return new_d_Add(dbgi, left, right, mode);
2320         case EXPR_BINARY_SUB_ASSIGN:
2321         case EXPR_BINARY_SUB:
2322                 return new_d_Sub(dbgi, left, right, mode);
2323         case EXPR_BINARY_MUL_ASSIGN:
2324         case EXPR_BINARY_MUL:
2325                 return new_d_Mul(dbgi, left, right, mode);
2326         case EXPR_BINARY_BITWISE_AND:
2327         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2328                 return new_d_And(dbgi, left, right, mode);
2329         case EXPR_BINARY_BITWISE_OR:
2330         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2331                 return new_d_Or(dbgi, left, right, mode);
2332         case EXPR_BINARY_BITWISE_XOR:
2333         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2334                 return new_d_Eor(dbgi, left, right, mode);
2335         case EXPR_BINARY_SHIFTLEFT:
2336         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2337                 return new_d_Shl(dbgi, left, right, mode);
2338         case EXPR_BINARY_SHIFTRIGHT:
2339         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2340                 if (mode_is_signed(mode)) {
2341                         return new_d_Shrs(dbgi, left, right, mode);
2342                 } else {
2343                         return new_d_Shr(dbgi, left, right, mode);
2344                 }
2345         case EXPR_BINARY_DIV:
2346         case EXPR_BINARY_DIV_ASSIGN: {
2347                 ir_node *pin = new_Pin(new_NoMem());
2348                 ir_node *op  = new_d_Div(dbgi, pin, left, right, mode,
2349                                          op_pin_state_floats);
2350                 ir_node *res = new_d_Proj(dbgi, op, mode, pn_Div_res);
2351                 return res;
2352         }
2353         case EXPR_BINARY_MOD:
2354         case EXPR_BINARY_MOD_ASSIGN: {
2355                 ir_node *pin = new_Pin(new_NoMem());
2356                 ir_node *op  = new_d_Mod(dbgi, pin, left, right, mode,
2357                                          op_pin_state_floats);
2358                 ir_node *res = new_d_Proj(dbgi, op, mode, pn_Mod_res);
2359                 return res;
2360         }
2361         default:
2362                 panic("unexpected expression kind");
2363         }
2364 }
2365
2366 static ir_node *binop_to_firm(binary_expression_t const *const expr)
2367 {
2368         ir_node *const left  = expression_to_value(expr->left);
2369         ir_node *const right = expression_to_value(expr->right);
2370         return create_op(expr, left, right);
2371 }
2372
2373 /**
2374  * Check if a given expression is a GNU __builtin_expect() call.
2375  */
2376 static bool is_builtin_expect(const expression_t *expression)
2377 {
2378         if (expression->kind != EXPR_CALL)
2379                 return false;
2380
2381         expression_t *function = expression->call.function;
2382         if (function->kind != EXPR_REFERENCE)
2383                 return false;
2384         reference_expression_t *ref = &function->reference;
2385         if (ref->entity->kind         != ENTITY_FUNCTION ||
2386             ref->entity->function.btk != BUILTIN_EXPECT)
2387                 return false;
2388
2389         return true;
2390 }
2391
2392 static void compare_to_control_flow(expression_t const *const expr, ir_node *const left, ir_node *const right, ir_relation const relation, jump_target *const true_target, jump_target *const false_target)
2393 {
2394         dbg_info *const dbgi = get_dbg_info(&expr->base.pos);
2395         ir_node  *const cmp  = new_d_Cmp(dbgi, left, right, relation);
2396         if (is_Const(cmp)) {
2397                 if (tarval_is_null(get_Const_tarval(cmp))) {
2398                         jump_to_target(false_target);
2399                 } else {
2400                         jump_to_target(true_target);
2401                 }
2402         } else {
2403                 ir_node *const cond       = new_d_Cond(dbgi, cmp);
2404                 ir_node *const true_proj  = new_d_Proj(dbgi, cond, mode_X, pn_Cond_true);
2405                 ir_node *const false_proj = new_d_Proj(dbgi, cond, mode_X, pn_Cond_false);
2406
2407                 /* set branch prediction info based on __builtin_expect */
2408                 if (is_builtin_expect(expr) && is_Cond(cond)) {
2409                         call_argument_t *const argument = expr->call.arguments->next;
2410                         if (is_constant_expression(argument->expression) == EXPR_CLASS_CONSTANT) {
2411                                 bool               const cnst = fold_constant_to_bool(argument->expression);
2412                                 cond_jmp_predicate const pred = cnst ? COND_JMP_PRED_TRUE : COND_JMP_PRED_FALSE;
2413                                 set_Cond_jmp_pred(cond, pred);
2414                         }
2415                 }
2416
2417                 add_pred_to_jump_target(true_target,  true_proj);
2418                 add_pred_to_jump_target(false_target, false_proj);
2419         }
2420         set_unreachable_now();
2421 }
2422
2423 static ir_node *control_flow_to_1_0(expression_t const *const expr, jump_target *const true_target, jump_target *const false_target)
2424 {
2425         ir_node        *val  = NULL;
2426         dbg_info *const dbgi = get_dbg_info(&expr->base.pos);
2427         ir_mode  *const mode = get_ir_mode_storage(expr->base.type);
2428         jump_target     exit_target;
2429         init_jump_target(&exit_target, NULL);
2430
2431         if (enter_jump_target(true_target)) {
2432                 jump_to_target(&exit_target);
2433                 val = new_d_Const(dbgi, get_mode_one(mode));
2434         }
2435
2436         if (enter_jump_target(false_target)) {
2437                 jump_to_target(&exit_target);
2438                 ir_node *const zero = new_d_Const(dbgi, get_mode_null(mode));
2439                 if (val) {
2440                         ir_node *const in[] = { val, zero };
2441                         val = new_rd_Phi(dbgi, exit_target.block, lengthof(in), in, mode);
2442                 } else {
2443                         val = zero;
2444                 }
2445         }
2446
2447         if (!enter_jump_target(&exit_target)) {
2448                 set_cur_block(new_Block(0, NULL));
2449                 val = new_d_Bad(dbgi, mode);
2450         }
2451         return val;
2452 }
2453
2454 static ir_node *binop_assign_to_firm(binary_expression_t const *const expr)
2455 {
2456         ir_node            *const right     = expression_to_value(expr->right);
2457         expression_t const *const left_expr = expr->left;
2458         ir_node            *const addr      = expression_to_addr(left_expr);
2459         ir_node            *const left      = get_value_from_lvalue(left_expr, addr);
2460         ir_node                  *result    = create_op(expr, left, right);
2461
2462         type_t *const type = skip_typeref(expr->base.type);
2463         if (is_type_atomic(type, ATOMIC_TYPE_BOOL)) {
2464                 jump_target true_target;
2465                 jump_target false_target;
2466                 init_jump_target(&true_target,  NULL);
2467                 init_jump_target(&false_target, NULL);
2468                 ir_mode *const mode = get_irn_mode(result);
2469                 ir_node *const zero = new_Const(get_mode_null(mode));
2470                 compare_to_control_flow((expression_t const*)expr, result, zero, ir_relation_unordered_less_greater, &true_target, &false_target);
2471                 result = control_flow_to_1_0((expression_t const*)expr, &true_target, &false_target);
2472         }
2473
2474         return set_value_for_expression_addr(left_expr, result, addr);
2475 }
2476
2477 static ir_node *assign_expression_to_firm(binary_expression_t const *const expr)
2478 {
2479         ir_node *const addr  = expression_to_addr(expr->left);
2480         ir_node *const right = expression_to_value(expr->right);
2481         return set_value_for_expression_addr(expr->left, right, addr);
2482 }
2483
2484 static ir_node *comma_expression_to_firm(binary_expression_t const *const expr)
2485 {
2486         expression_to_value(expr->left);
2487         return expression_to_value(expr->right);
2488 }
2489
2490 static ir_node *array_access_addr(const array_access_expression_t *expression)
2491 {
2492         dbg_info *dbgi        = get_dbg_info(&expression->base.pos);
2493         ir_node  *base_addr   = expression_to_value(expression->array_ref);
2494         ir_node  *offset      = expression_to_value(expression->index);
2495         type_t   *ref_type    = skip_typeref(expression->array_ref->base.type);
2496         ir_node  *real_offset = adjust_for_pointer_arithmetic(dbgi, offset, ref_type);
2497         ir_node  *result      = new_d_Add(dbgi, base_addr, real_offset, mode_P_data);
2498
2499         return result;
2500 }
2501
2502 static ir_node *array_access_to_firm(
2503                 const array_access_expression_t *expression)
2504 {
2505         dbg_info *dbgi   = get_dbg_info(&expression->base.pos);
2506         ir_node  *addr   = array_access_addr(expression);
2507         type_t   *type   = revert_automatic_type_conversion(
2508                         (const expression_t*) expression);
2509         type             = skip_typeref(type);
2510
2511         return deref_address(dbgi, type, addr);
2512 }
2513
2514 static long get_offsetof_offset(const offsetof_expression_t *expression)
2515 {
2516         type_t *orig_type = expression->type;
2517         long    offset    = 0;
2518
2519         designator_t *designator = expression->designator;
2520         for ( ; designator != NULL; designator = designator->next) {
2521                 type_t *type = skip_typeref(orig_type);
2522                 /* be sure the type is constructed */
2523                 (void) get_ir_type(type);
2524
2525                 if (designator->symbol != NULL) {
2526                         assert(is_type_compound(type));
2527                         symbol_t *symbol = designator->symbol;
2528
2529                         compound_t *compound = type->compound.compound;
2530                         entity_t   *iter     = compound->members.entities;
2531                         for (; iter->base.symbol != symbol; iter = iter->base.next) {}
2532
2533                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
2534                         assert(iter->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
2535                         offset += get_entity_offset(iter->compound_member.entity);
2536
2537                         orig_type = iter->declaration.type;
2538                 } else {
2539                         expression_t *array_index = designator->array_index;
2540                         assert(designator->array_index != NULL);
2541                         assert(is_type_array(type));
2542
2543                         long index         = fold_constant_to_int(array_index);
2544                         ir_type *arr_type  = get_ir_type(type);
2545                         ir_type *elem_type = get_array_element_type(arr_type);
2546                         long     elem_size = get_type_size_bytes(elem_type);
2547
2548                         offset += index * elem_size;
2549
2550                         orig_type = type->array.element_type;
2551                 }
2552         }
2553
2554         return offset;
2555 }
2556
2557 static ir_node *offsetof_to_firm(const offsetof_expression_t *expression)
2558 {
2559         ir_mode   *mode   = get_ir_mode_storage(expression->base.type);
2560         long       offset = get_offsetof_offset(expression);
2561         ir_tarval *tv     = new_tarval_from_long(offset, mode);
2562         dbg_info  *dbgi   = get_dbg_info(&expression->base.pos);
2563
2564         return new_d_Const(dbgi, tv);
2565 }
2566
2567 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
2568                                      ir_entity *entity, type_t *type);
2569 static ir_initializer_t *create_ir_initializer(
2570                 const initializer_t *initializer, type_t *type);
2571
2572 static ir_entity *create_initializer_entity(dbg_info *dbgi,
2573                                             initializer_t *initializer,
2574                                             type_t *type)
2575 {
2576         /* create the ir_initializer */
2577         PUSH_IRG(get_const_code_irg());
2578         ir_initializer_t *irinitializer = create_ir_initializer(initializer, type);
2579         POP_IRG();
2580
2581         ident     *const id          = id_unique("initializer.%u");
2582         ir_type   *const irtype      = get_ir_type(type);
2583         ir_type   *const global_type = get_glob_type();
2584         ir_entity *const entity      = new_d_entity(global_type, id, irtype, dbgi);
2585         set_entity_ld_ident(entity, id);
2586         set_entity_visibility(entity, ir_visibility_private);
2587         add_entity_linkage(entity, IR_LINKAGE_CONSTANT);
2588         set_entity_initializer(entity, irinitializer);
2589         return entity;
2590 }
2591
2592 static ir_node *compound_literal_addr(compound_literal_expression_t const *const expression)
2593 {
2594         dbg_info      *dbgi        = get_dbg_info(&expression->base.pos);
2595         type_t        *type        = expression->type;
2596         initializer_t *initializer = expression->initializer;
2597
2598         if (expression->global_scope ||
2599                 ((type->base.qualifiers & TYPE_QUALIFIER_CONST)
2600             && is_constant_initializer(initializer) == EXPR_CLASS_CONSTANT)) {
2601                 ir_entity *entity = create_initializer_entity(dbgi, initializer, type);
2602                 return create_symconst(dbgi, entity);
2603         } else {
2604                 /* create an entity on the stack */
2605                 ident   *const id     = id_unique("CompLit.%u");
2606                 ir_type *const irtype = get_ir_type(type);
2607                 ir_type *frame_type   = get_irg_frame_type(current_ir_graph);
2608
2609                 ir_entity *const entity = new_d_entity(frame_type, id, irtype, dbgi);
2610                 set_entity_ld_ident(entity, id);
2611
2612                 /* create initialisation code */
2613                 create_local_initializer(initializer, dbgi, entity, type);
2614
2615                 /* create a sel for the compound literal address */
2616                 ir_node *frame = get_irg_frame(current_ir_graph);
2617                 ir_node *sel   = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
2618                 return sel;
2619         }
2620 }
2621
2622 static ir_node *compound_literal_to_firm(compound_literal_expression_t const* const expr)
2623 {
2624         dbg_info *const dbgi = get_dbg_info(&expr->base.pos);
2625         type_t   *const type = expr->type;
2626         ir_node  *const addr = compound_literal_addr(expr);
2627         return deref_address(dbgi, type, addr);
2628 }
2629
2630 /**
2631  * Transform a sizeof expression into Firm code.
2632  */
2633 static ir_node *sizeof_to_firm(const typeprop_expression_t *expression)
2634 {
2635         type_t *const type = skip_typeref(expression->type);
2636         /* §6.5.3.4:2 if the type is a VLA, evaluate the expression. */
2637         if (is_type_array(type) && type->array.is_vla
2638                         && expression->tp_expression != NULL) {
2639                 expression_to_value(expression->tp_expression);
2640         }
2641
2642         return get_type_size_node(type);
2643 }
2644
2645 static entity_t *get_expression_entity(const expression_t *expression)
2646 {
2647         if (expression->kind != EXPR_REFERENCE)
2648                 return NULL;
2649
2650         return expression->reference.entity;
2651 }
2652
2653 static unsigned get_cparser_entity_alignment(const entity_t *entity)
2654 {
2655         switch(entity->kind) {
2656         case DECLARATION_KIND_CASES:
2657                 return entity->declaration.alignment;
2658         case ENTITY_STRUCT:
2659         case ENTITY_UNION:
2660                 return entity->compound.alignment;
2661         case ENTITY_TYPEDEF:
2662                 return entity->typedefe.alignment;
2663         default:
2664                 break;
2665         }
2666         return 0;
2667 }
2668
2669 /**
2670  * Transform an alignof expression into Firm code.
2671  */
2672 static ir_node *alignof_to_firm(const typeprop_expression_t *expression)
2673 {
2674         unsigned alignment = 0;
2675
2676         const expression_t *tp_expression = expression->tp_expression;
2677         if (tp_expression != NULL) {
2678                 entity_t *entity = get_expression_entity(tp_expression);
2679                 if (entity != NULL) {
2680                         alignment = get_cparser_entity_alignment(entity);
2681                 }
2682         }
2683
2684         if (alignment == 0) {
2685                 type_t *type = expression->type;
2686                 alignment = get_type_alignment(type);
2687         }
2688
2689         dbg_info  *dbgi = get_dbg_info(&expression->base.pos);
2690         ir_mode   *mode = get_ir_mode_storage(expression->base.type);
2691         ir_tarval *tv   = new_tarval_from_long(alignment, mode);
2692         return new_d_Const(dbgi, tv);
2693 }
2694
2695 static void init_ir_types(void);
2696
2697 ir_tarval *fold_constant_to_tarval(const expression_t *expression)
2698 {
2699         assert(is_constant_expression(expression) == EXPR_CLASS_CONSTANT);
2700
2701         bool constant_folding_old = constant_folding;
2702         constant_folding = true;
2703         int old_optimize         = get_optimize();
2704         int old_constant_folding = get_opt_constant_folding();
2705         set_optimize(1);
2706         set_opt_constant_folding(1);
2707
2708         init_ir_types();
2709
2710         PUSH_IRG(get_const_code_irg());
2711         ir_node *const cnst = expression_to_value(expression);
2712         POP_IRG();
2713
2714         set_optimize(old_optimize);
2715         set_opt_constant_folding(old_constant_folding);
2716         constant_folding = constant_folding_old;
2717
2718         if (!is_Const(cnst))
2719                 panic("couldn't fold constant");
2720         return get_Const_tarval(cnst);
2721 }
2722
2723 /* this function is only used in parser.c, but it relies on libfirm functionality */
2724 bool constant_is_negative(const expression_t *expression)
2725 {
2726         ir_tarval *tv = fold_constant_to_tarval(expression);
2727         return tarval_is_negative(tv);
2728 }
2729
2730 long fold_constant_to_int(const expression_t *expression)
2731 {
2732         ir_tarval *tv = fold_constant_to_tarval(expression);
2733         if (!tarval_is_long(tv)) {
2734                 panic("result of constant folding is not integer");
2735         }
2736
2737         return get_tarval_long(tv);
2738 }
2739
2740 bool fold_constant_to_bool(const expression_t *expression)
2741 {
2742         ir_tarval *tv = fold_constant_to_tarval(expression);
2743         return !tarval_is_null(tv);
2744 }
2745
2746 static ir_node *conditional_to_firm(const conditional_expression_t *expression)
2747 {
2748         jump_target true_target;
2749         jump_target false_target;
2750         init_jump_target(&true_target,  NULL);
2751         init_jump_target(&false_target, NULL);
2752         ir_node *const cond_expr = expression_to_control_flow(expression->condition, &true_target, &false_target);
2753
2754         ir_node        *val  = NULL;
2755         dbg_info *const dbgi = get_dbg_info(&expression->base.pos);
2756         type_t   *const type = skip_typeref(expression->base.type);
2757         ir_mode  *const mode = get_ir_mode_arithmetic(type);
2758         jump_target exit_target;
2759         init_jump_target(&exit_target, NULL);
2760
2761         if (enter_jump_target(&true_target)) {
2762                 if (expression->true_expression) {
2763                         val = expression_to_value(expression->true_expression);
2764                 } else if (cond_expr) {
2765                         val = cond_expr;
2766                 } else {
2767                         /* Condition ended with a short circuit (&&, ||, !) operation or a
2768                          * comparison.  Generate a "1" as value for the true branch. */
2769                         val = new_Const(get_mode_one(mode));
2770                 }
2771                 if (val)
2772                         val = create_conv(dbgi, val, mode);
2773                 jump_to_target(&exit_target);
2774         }
2775
2776         if (enter_jump_target(&false_target)) {
2777                 ir_node *false_val = expression_to_value(expression->false_expression);
2778                 if (false_val)
2779                         false_val = create_conv(dbgi, false_val, mode);
2780                 jump_to_target(&exit_target);
2781                 if (val) {
2782                         ir_node *const in[] = { val, false_val };
2783                         val = new_rd_Phi(dbgi, exit_target.block, lengthof(in), in, get_irn_mode(val));
2784                 } else {
2785                         val = false_val;
2786                 }
2787         }
2788
2789         if (!enter_jump_target(&exit_target)) {
2790                 set_cur_block(new_Block(0, NULL));
2791                 if (!is_type_void(type))
2792                         val = new_Bad(mode);
2793         }
2794         return val;
2795 }
2796
2797 /**
2798  * Returns an IR-node representing the address of a field.
2799  */
2800 static ir_node *select_addr(const select_expression_t *expression)
2801 {
2802         dbg_info *dbgi = get_dbg_info(&expression->base.pos);
2803
2804         construct_select_compound(expression);
2805
2806         ir_node *compound_addr = expression_to_value(expression->compound);
2807
2808         entity_t *entry = expression->compound_entry;
2809         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
2810         assert(entry->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
2811
2812         if (constant_folding) {
2813                 ir_mode *mode      = get_irn_mode(compound_addr);
2814                 ir_mode *mode_uint = get_reference_mode_unsigned_eq(mode);
2815                 ir_node *ofs       = new_Const_long(mode_uint, entry->compound_member.offset);
2816                 return new_d_Add(dbgi, compound_addr, ofs, mode);
2817         } else {
2818                 ir_entity *irentity = entry->compound_member.entity;
2819                 assert(irentity != NULL);
2820                 return new_d_simpleSel(dbgi, new_NoMem(), compound_addr, irentity);
2821         }
2822 }
2823
2824 static ir_node *select_to_firm(const select_expression_t *expression)
2825 {
2826         dbg_info *dbgi = get_dbg_info(&expression->base.pos);
2827         ir_node  *addr = select_addr(expression);
2828         type_t   *type = revert_automatic_type_conversion(
2829                         (const expression_t*) expression);
2830         type           = skip_typeref(type);
2831
2832         entity_t *entry = expression->compound_entry;
2833         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
2834
2835         if (entry->compound_member.bitfield) {
2836                 return bitfield_extract_to_firm(expression, addr);
2837         }
2838
2839         return deref_address(dbgi, type, addr);
2840 }
2841
2842 /* Values returned by __builtin_classify_type. */
2843 typedef enum gcc_type_class
2844 {
2845         no_type_class = -1,
2846         void_type_class,
2847         integer_type_class,
2848         char_type_class,
2849         enumeral_type_class,
2850         boolean_type_class,
2851         pointer_type_class,
2852         reference_type_class,
2853         offset_type_class,
2854         real_type_class,
2855         complex_type_class,
2856         function_type_class,
2857         method_type_class,
2858         record_type_class,
2859         union_type_class,
2860         array_type_class,
2861         string_type_class,
2862         set_type_class,
2863         file_type_class,
2864         lang_type_class
2865 } gcc_type_class;
2866
2867 static ir_node *classify_type_to_firm(const classify_type_expression_t *const expr)
2868 {
2869         type_t *type = expr->type_expression->base.type;
2870
2871         /* FIXME gcc returns different values depending on whether compiling C or C++
2872          * e.g. int x[10] is pointer_type_class in C, but array_type_class in C++ */
2873         gcc_type_class tc;
2874         for (;;) {
2875                 type = skip_typeref(type);
2876                 switch (type->kind) {
2877                         case TYPE_ATOMIC: {
2878                                 const atomic_type_t *const atomic_type = &type->atomic;
2879                                 switch (atomic_type->akind) {
2880                                         /* gcc cannot do that */
2881                                         case ATOMIC_TYPE_VOID:
2882                                                 tc = void_type_class;
2883                                                 goto make_const;
2884
2885                                         case ATOMIC_TYPE_WCHAR_T:   /* gcc handles this as integer */
2886                                         case ATOMIC_TYPE_CHAR:      /* gcc handles this as integer */
2887                                         case ATOMIC_TYPE_SCHAR:     /* gcc handles this as integer */
2888                                         case ATOMIC_TYPE_UCHAR:     /* gcc handles this as integer */
2889                                         case ATOMIC_TYPE_SHORT:
2890                                         case ATOMIC_TYPE_USHORT:
2891                                         case ATOMIC_TYPE_INT:
2892                                         case ATOMIC_TYPE_UINT:
2893                                         case ATOMIC_TYPE_LONG:
2894                                         case ATOMIC_TYPE_ULONG:
2895                                         case ATOMIC_TYPE_LONGLONG:
2896                                         case ATOMIC_TYPE_ULONGLONG:
2897                                         case ATOMIC_TYPE_BOOL:      /* gcc handles this as integer */
2898                                                 tc = integer_type_class;
2899                                                 goto make_const;
2900
2901                                         case ATOMIC_TYPE_FLOAT:
2902                                         case ATOMIC_TYPE_DOUBLE:
2903                                         case ATOMIC_TYPE_LONG_DOUBLE:
2904                                                 tc = real_type_class;
2905                                                 goto make_const;
2906                                 }
2907                                 panic("Unexpected atomic type.");
2908                         }
2909
2910                         case TYPE_COMPLEX:         tc = complex_type_class; goto make_const;
2911                         case TYPE_IMAGINARY:       tc = complex_type_class; goto make_const;
2912                         case TYPE_ARRAY:           /* gcc handles this as pointer */
2913                         case TYPE_FUNCTION:        /* gcc handles this as pointer */
2914                         case TYPE_POINTER:         tc = pointer_type_class; goto make_const;
2915                         case TYPE_COMPOUND_STRUCT: tc = record_type_class;  goto make_const;
2916                         case TYPE_COMPOUND_UNION:  tc = union_type_class;   goto make_const;
2917
2918                         /* gcc handles this as integer */
2919                         case TYPE_ENUM:            tc = integer_type_class; goto make_const;
2920
2921                         /* gcc classifies the referenced type */
2922                         case TYPE_REFERENCE: type = type->reference.refers_to; continue;
2923
2924                         /* typedef/typeof should be skipped already */
2925                         case TYPE_TYPEDEF:
2926                         case TYPE_TYPEOF:
2927                         case TYPE_ERROR:
2928                                 break;
2929                 }
2930                 panic("unexpected type.");
2931         }
2932
2933 make_const:;
2934         dbg_info  *const dbgi = get_dbg_info(&expr->base.pos);
2935         ir_mode   *const mode = atomic_modes[ATOMIC_TYPE_INT];
2936         ir_tarval *const tv   = new_tarval_from_long(tc, mode);
2937         return new_d_Const(dbgi, tv);
2938 }
2939
2940 static ir_node *function_name_to_firm(
2941                 const funcname_expression_t *const expr)
2942 {
2943         switch(expr->kind) {
2944         case FUNCNAME_FUNCTION:
2945         case FUNCNAME_PRETTY_FUNCTION:
2946         case FUNCNAME_FUNCDNAME:
2947                 if (current_function_name == NULL) {
2948                         position_t const *const src_pos = &expr->base.pos;
2949                         char       const *const name    = current_function_entity->base.symbol->string;
2950                         string_t          const string  = { name, strlen(name), STRING_ENCODING_CHAR };
2951                         current_function_name = string_to_firm(src_pos, "__func__.%u", &string);
2952                 }
2953                 return current_function_name;
2954         case FUNCNAME_FUNCSIG:
2955                 if (current_funcsig == NULL) {
2956                         position_t const *const src_pos = &expr->base.pos;
2957                         ir_entity        *const ent     = get_irg_entity(current_ir_graph);
2958                         char       const *const name    = get_entity_ld_name(ent);
2959                         string_t          const string  = { name, strlen(name), STRING_ENCODING_CHAR };
2960                         current_funcsig = string_to_firm(src_pos, "__FUNCSIG__.%u", &string);
2961                 }
2962                 return current_funcsig;
2963         }
2964         panic("Unsupported function name");
2965 }
2966
2967 static ir_node *statement_expression_to_firm(const statement_expression_t *expr)
2968 {
2969         statement_t *statement = expr->statement;
2970
2971         assert(statement->kind == STATEMENT_COMPOUND);
2972         return compound_statement_to_firm(&statement->compound);
2973 }
2974
2975 static ir_node *va_start_expression_to_firm(
2976         const va_start_expression_t *const expr)
2977 {
2978         ir_entity *param_ent = current_vararg_entity;
2979         if (param_ent == NULL) {
2980                 size_t   const n           = IR_VA_START_PARAMETER_NUMBER;
2981                 ir_type *const frame_type  = get_irg_frame_type(current_ir_graph);
2982                 ir_type *const param_type  = get_unknown_type();
2983                 param_ent = new_parameter_entity(frame_type, n, param_type);
2984                 current_vararg_entity = param_ent;
2985         }
2986
2987         ir_node  *const frame   = get_irg_frame(current_ir_graph);
2988         dbg_info *const dbgi    = get_dbg_info(&expr->base.pos);
2989         ir_node  *const no_mem  = new_NoMem();
2990         ir_node  *const arg_sel = new_d_simpleSel(dbgi, no_mem, frame, param_ent);
2991
2992         set_value_for_expression_addr(expr->ap, arg_sel, NULL);
2993
2994         return NULL;
2995 }
2996
2997 static ir_node *va_arg_expression_to_firm(const va_arg_expression_t *const expr)
2998 {
2999         type_t       *const type    = expr->base.type;
3000         expression_t *const ap_expr = expr->ap;
3001         ir_node      *const ap_addr = expression_to_addr(ap_expr);
3002         ir_node      *const ap      = get_value_from_lvalue(ap_expr, ap_addr);
3003         dbg_info     *const dbgi    = get_dbg_info(&expr->base.pos);
3004         ir_node      *const res     = deref_address(dbgi, type, ap);
3005
3006         ir_node      *const cnst    = get_type_size_node(expr->base.type);
3007         ir_mode      *const mode    = get_irn_mode(cnst);
3008         ir_node      *const c1      = new_Const_long(mode, stack_param_align - 1);
3009         ir_node      *const c2      = new_d_Add(dbgi, cnst, c1, mode);
3010         ir_node      *const c3      = new_Const_long(mode, -(long)stack_param_align);
3011         ir_node      *const c4      = new_d_And(dbgi, c2, c3, mode);
3012         ir_node      *const add     = new_d_Add(dbgi, ap, c4, mode_P_data);
3013
3014         set_value_for_expression_addr(ap_expr, add, ap_addr);
3015
3016         return res;
3017 }
3018
3019 /**
3020  * Generate Firm for a va_copy expression.
3021  */
3022 static ir_node *va_copy_expression_to_firm(const va_copy_expression_t *const expr)
3023 {
3024         ir_node *const src = expression_to_value(expr->src);
3025         set_value_for_expression_addr(expr->dst, src, NULL);
3026         return NULL;
3027 }
3028
3029 static ir_node *dereference_addr(const unary_expression_t *const expression)
3030 {
3031         assert(expression->base.kind == EXPR_UNARY_DEREFERENCE);
3032         return expression_to_value(expression->value);
3033 }
3034
3035 /**
3036  * Returns a IR-node representing an lvalue of the given expression.
3037  */
3038 static ir_node *expression_to_addr(const expression_t *expression)
3039 {
3040         switch(expression->kind) {
3041         case EXPR_ARRAY_ACCESS:
3042                 return array_access_addr(&expression->array_access);
3043         case EXPR_COMPOUND_LITERAL:
3044                 return compound_literal_addr(&expression->compound_literal);
3045         case EXPR_REFERENCE:
3046                 return reference_addr(&expression->reference);
3047         case EXPR_SELECT:
3048                 return select_addr(&expression->select);
3049         case EXPR_UNARY_DEREFERENCE:
3050                 return dereference_addr(&expression->unary);
3051         default:
3052                 break;
3053         }
3054         panic("trying to get address of non-lvalue");
3055 }
3056
3057 static ir_node *builtin_constant_to_firm(
3058                 const builtin_constant_expression_t *expression)
3059 {
3060         ir_mode *const mode = get_ir_mode_storage(expression->base.type);
3061         bool     const v    = is_constant_expression(expression->value) == EXPR_CLASS_CONSTANT;
3062         return create_Const_from_bool(mode, v);
3063 }
3064
3065 static ir_node *builtin_types_compatible_to_firm(
3066                 const builtin_types_compatible_expression_t *expression)
3067 {
3068         type_t  *const left  = get_unqualified_type(skip_typeref(expression->left));
3069         type_t  *const right = get_unqualified_type(skip_typeref(expression->right));
3070         bool     const value = types_compatible(left, right);
3071         ir_mode *const mode  = get_ir_mode_storage(expression->base.type);
3072         return create_Const_from_bool(mode, value);
3073 }
3074
3075 static void prepare_label_target(label_t *const label)
3076 {
3077         if (label->address_taken && !label->indirect_block) {
3078                 ir_node *const iblock = new_immBlock();
3079                 label->indirect_block = iblock;
3080                 ARR_APP1(ir_node*, ijmp_blocks, iblock);
3081                 jump_from_block_to_target(&label->target, iblock);
3082         }
3083 }
3084
3085 /**
3086  * Pointer to a label.  This is used for the
3087  * GNU address-of-label extension.
3088  */
3089 static ir_node *label_address_to_firm(const label_address_expression_t *label)
3090 {
3091         /* Beware: Might be called from create initializer with current_ir_graph
3092          * set to const_code_irg. */
3093         PUSH_IRG(current_function);
3094         prepare_label_target(label->label);
3095         POP_IRG();
3096
3097         symconst_symbol value;
3098         value.entity_p = create_Block_entity(label->label->indirect_block);
3099         dbg_info *const dbgi = get_dbg_info(&label->base.pos);
3100         return new_d_SymConst(dbgi, mode_P_code, value, symconst_addr_ent);
3101 }
3102
3103 static ir_node *expression_to_value(expression_t const *const expr)
3104 {
3105 #ifndef NDEBUG
3106         if (!constant_folding) {
3107                 assert(!expr->base.transformed);
3108                 ((expression_t*)expr)->base.transformed = true;
3109         }
3110 #endif
3111
3112         switch (expr->kind) {
3113         case EXPR_UNARY_CAST:
3114                 if (is_type_atomic(skip_typeref(expr->base.type), ATOMIC_TYPE_BOOL)) {
3115         case EXPR_BINARY_EQUAL:
3116         case EXPR_BINARY_GREATER:
3117         case EXPR_BINARY_GREATEREQUAL:
3118         case EXPR_BINARY_ISGREATER:
3119         case EXPR_BINARY_ISGREATEREQUAL:
3120         case EXPR_BINARY_ISLESS:
3121         case EXPR_BINARY_ISLESSEQUAL:
3122         case EXPR_BINARY_ISLESSGREATER:
3123         case EXPR_BINARY_ISUNORDERED:
3124         case EXPR_BINARY_LESS:
3125         case EXPR_BINARY_LESSEQUAL:
3126         case EXPR_BINARY_LOGICAL_AND:
3127         case EXPR_BINARY_LOGICAL_OR:
3128         case EXPR_BINARY_NOTEQUAL:
3129         case EXPR_UNARY_NOT:;
3130                         jump_target true_target;
3131                         jump_target false_target;
3132                         init_jump_target(&true_target,  NULL);
3133                         init_jump_target(&false_target, NULL);
3134                         expression_to_control_flow(expr, &true_target, &false_target);
3135                         return control_flow_to_1_0(expr, &true_target, &false_target);
3136                 } else {
3137                         return create_cast(&expr->unary);
3138                 }
3139
3140         case EXPR_BINARY_ADD:
3141         case EXPR_BINARY_BITWISE_AND:
3142         case EXPR_BINARY_BITWISE_OR:
3143         case EXPR_BINARY_BITWISE_XOR:
3144         case EXPR_BINARY_DIV:
3145         case EXPR_BINARY_MOD:
3146         case EXPR_BINARY_MUL:
3147         case EXPR_BINARY_SHIFTLEFT:
3148         case EXPR_BINARY_SHIFTRIGHT:
3149         case EXPR_BINARY_SUB:
3150                 return binop_to_firm(&expr->binary);
3151
3152         case EXPR_BINARY_ADD_ASSIGN:
3153         case EXPR_BINARY_BITWISE_AND_ASSIGN:
3154         case EXPR_BINARY_BITWISE_OR_ASSIGN:
3155         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
3156         case EXPR_BINARY_DIV_ASSIGN:
3157         case EXPR_BINARY_MOD_ASSIGN:
3158         case EXPR_BINARY_MUL_ASSIGN:
3159         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
3160         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
3161         case EXPR_BINARY_SUB_ASSIGN:
3162                 return binop_assign_to_firm(&expr->binary);
3163
3164         {
3165                 bool inc;
3166                 bool pre;
3167         case EXPR_UNARY_POSTFIX_DECREMENT: inc = false; pre = false; goto incdec;
3168         case EXPR_UNARY_POSTFIX_INCREMENT: inc = true;  pre = false; goto incdec;
3169         case EXPR_UNARY_PREFIX_DECREMENT:  inc = false; pre = true;  goto incdec;
3170         case EXPR_UNARY_PREFIX_INCREMENT:  inc = true;  pre = true;  goto incdec;
3171 incdec:
3172                 return incdec_to_firm(&expr->unary, inc, pre);
3173         }
3174
3175         case EXPR_ALIGNOF:                    return alignof_to_firm(                 &expr->typeprop);
3176         case EXPR_ARRAY_ACCESS:               return array_access_to_firm(            &expr->array_access);
3177         case EXPR_BINARY_ASSIGN:              return assign_expression_to_firm(       &expr->binary);
3178         case EXPR_BINARY_COMMA:               return comma_expression_to_firm(        &expr->binary);
3179         case EXPR_BUILTIN_CONSTANT_P:         return builtin_constant_to_firm(        &expr->builtin_constant);
3180         case EXPR_BUILTIN_TYPES_COMPATIBLE_P: return builtin_types_compatible_to_firm(&expr->builtin_types_compatible);
3181         case EXPR_CALL:                       return call_expression_to_firm(         &expr->call);
3182         case EXPR_CLASSIFY_TYPE:              return classify_type_to_firm(           &expr->classify_type);
3183         case EXPR_COMPOUND_LITERAL:           return compound_literal_to_firm(        &expr->compound_literal);
3184         case EXPR_CONDITIONAL:                return conditional_to_firm(             &expr->conditional);
3185         case EXPR_ENUM_CONSTANT:              return enum_constant_to_firm(           &expr->reference);
3186         case EXPR_FUNCNAME:                   return function_name_to_firm(           &expr->funcname);
3187         case EXPR_LABEL_ADDRESS:              return label_address_to_firm(           &expr->label_address);
3188         case EXPR_LITERAL_CASES:              return literal_to_firm(                 &expr->literal);
3189         case EXPR_LITERAL_CHARACTER:          return char_literal_to_firm(            &expr->string_literal);
3190         case EXPR_OFFSETOF:                   return offsetof_to_firm(                &expr->offsetofe);
3191         case EXPR_REFERENCE:                  return reference_expression_to_firm(    &expr->reference);
3192         case EXPR_SELECT:                     return select_to_firm(                  &expr->select);
3193         case EXPR_SIZEOF:                     return sizeof_to_firm(                  &expr->typeprop);
3194         case EXPR_STATEMENT:                  return statement_expression_to_firm(    &expr->statement);
3195         case EXPR_STRING_LITERAL:             return string_to_firm(                  &expr->base.pos, "str.%u", &expr->string_literal.value);
3196         case EXPR_UNARY_ASSUME:               return handle_assume(                    expr->unary.value);
3197         case EXPR_UNARY_BITWISE_NEGATE:       return complement_to_firm(              &expr->unary);
3198         case EXPR_UNARY_DEREFERENCE:          return dereference_to_firm(             &expr->unary);
3199         case EXPR_UNARY_NEGATE:               return negate_to_firm(                  &expr->unary);
3200         case EXPR_UNARY_PLUS:                 return expression_to_value(              expr->unary.value);
3201         case EXPR_UNARY_TAKE_ADDRESS:         return expression_to_addr(               expr->unary.value);
3202         case EXPR_VA_ARG:                     return va_arg_expression_to_firm(       &expr->va_arge);
3203         case EXPR_VA_COPY:                    return va_copy_expression_to_firm(      &expr->va_copye);
3204         case EXPR_VA_START:                   return va_start_expression_to_firm(     &expr->va_starte);
3205
3206         case EXPR_UNARY_DELETE:
3207         case EXPR_UNARY_DELETE_ARRAY:
3208         case EXPR_UNARY_THROW:
3209                 panic("expression not implemented");
3210
3211         case EXPR_ERROR:
3212                 break;
3213         }
3214         panic("invalid expression");
3215 }
3216
3217 /**
3218  * create a short-circuit expression evaluation that tries to construct
3219  * efficient control flow structures for &&, || and ! expressions
3220  */
3221 static ir_node *expression_to_control_flow(expression_t const *const expr, jump_target *const true_target, jump_target *const false_target)
3222 {
3223         switch (expr->kind) {
3224         case EXPR_UNARY_NOT:
3225                 expression_to_control_flow(expr->unary.value, false_target, true_target);
3226                 return NULL;
3227
3228         case EXPR_BINARY_LOGICAL_AND: {
3229                 jump_target extra_target;
3230                 init_jump_target(&extra_target, NULL);
3231                 expression_to_control_flow(expr->binary.left, &extra_target, false_target);
3232                 if (enter_jump_target(&extra_target))
3233                         expression_to_control_flow(expr->binary.right, true_target, false_target);
3234                 return NULL;
3235         }
3236
3237         case EXPR_BINARY_LOGICAL_OR: {
3238                 jump_target extra_target;
3239                 init_jump_target(&extra_target, NULL);
3240                 expression_to_control_flow(expr->binary.left, true_target, &extra_target);
3241                 if (enter_jump_target(&extra_target))
3242                         expression_to_control_flow(expr->binary.right, true_target, false_target);
3243                 return NULL;
3244         }
3245
3246         case EXPR_BINARY_COMMA:
3247                 expression_to_value(expr->binary.left);
3248                 return expression_to_control_flow(expr->binary.right, true_target, false_target);
3249
3250                 ir_node    *val;
3251                 ir_node    *left;
3252                 ir_node    *right;
3253                 ir_relation relation;
3254         case EXPR_BINARY_EQUAL:
3255         case EXPR_BINARY_GREATER:
3256         case EXPR_BINARY_GREATEREQUAL:
3257         case EXPR_BINARY_ISGREATER:
3258         case EXPR_BINARY_ISGREATEREQUAL:
3259         case EXPR_BINARY_ISLESS:
3260         case EXPR_BINARY_ISLESSEQUAL:
3261         case EXPR_BINARY_ISLESSGREATER:
3262         case EXPR_BINARY_ISUNORDERED:
3263         case EXPR_BINARY_LESS:
3264         case EXPR_BINARY_LESSEQUAL:
3265         case EXPR_BINARY_NOTEQUAL: {
3266                 dbg_info *const dbgi = get_dbg_info(&expr->base.pos);
3267                 type_t   *const type = skip_typeref(expr->binary.left->base.type);
3268                 ir_mode  *const mode = get_ir_mode_arithmetic(type);
3269                 val      = NULL;
3270                 left     = create_conv(dbgi, expression_to_value(expr->binary.left),  mode);
3271                 right    = create_conv(dbgi, expression_to_value(expr->binary.right), mode);
3272                 relation = get_relation(expr->kind);
3273                 goto make_cmp;
3274         }
3275
3276         case EXPR_UNARY_CAST:
3277                 if (is_type_atomic(skip_typeref(expr->base.type), ATOMIC_TYPE_BOOL)) {
3278                         expression_to_control_flow(expr->unary.value, true_target, false_target);
3279                         return NULL;
3280                 } else {
3281         default:;
3282                         dbg_info *const dbgi = get_dbg_info(&expr->base.pos);
3283                         type_t   *const type = skip_typeref(expr->base.type);
3284                         ir_mode  *const mode = get_ir_mode_arithmetic(type);
3285                         val      = create_conv(dbgi, expression_to_value(expr), mode);
3286                         left     = val;
3287                         right    = new_Const(get_mode_null(get_irn_mode(val)));
3288                         relation = ir_relation_unordered_less_greater;
3289 make_cmp:
3290                         compare_to_control_flow(expr, left, right, relation, true_target, false_target);
3291                         return val;
3292                 }
3293         }
3294 }
3295
3296 static void create_variable_entity(entity_t *variable,
3297                                    declaration_kind_t declaration_kind,
3298                                    ir_type *parent_type)
3299 {
3300         assert(variable->kind == ENTITY_VARIABLE);
3301         type_t    *type = skip_typeref(variable->declaration.type);
3302
3303         ident     *const id        = new_id_from_str(variable->base.symbol->string);
3304         ir_type   *const irtype    = get_ir_type(type);
3305         dbg_info  *const dbgi      = get_dbg_info(&variable->base.pos);
3306         ir_entity *const irentity  = new_d_entity(parent_type, id, irtype, dbgi);
3307         unsigned         alignment = variable->declaration.alignment;
3308
3309         set_entity_alignment(irentity, alignment);
3310
3311         handle_decl_modifiers(irentity, variable);
3312
3313         variable->declaration.kind  = (unsigned char) declaration_kind;
3314         variable->variable.v.entity = irentity;
3315         set_entity_ld_ident(irentity, create_ld_ident(variable));
3316
3317         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
3318                 set_entity_volatility(irentity, volatility_is_volatile);
3319         }
3320 }
3321
3322
3323 typedef struct type_path_entry_t type_path_entry_t;
3324 struct type_path_entry_t {
3325         type_t           *type;
3326         ir_initializer_t *initializer;
3327         size_t            index;
3328         entity_t         *compound_entry;
3329 };
3330
3331 typedef struct type_path_t type_path_t;
3332 struct type_path_t {
3333         type_path_entry_t *path;
3334         type_t            *top_type;
3335         bool               invalid;
3336 };
3337
3338 static __attribute__((unused)) void debug_print_type_path(const type_path_t *path)
3339 {
3340         size_t len = ARR_LEN(path->path);
3341
3342         for (size_t i = 0; i < len; ++i) {
3343                 const type_path_entry_t *entry = & path->path[i];
3344
3345                 type_t *type = skip_typeref(entry->type);
3346                 if (is_type_compound(type)) {
3347                         fprintf(stderr, ".%s", entry->compound_entry->base.symbol->string);
3348                 } else if (is_type_array(type)) {
3349                         fprintf(stderr, "[%u]", (unsigned) entry->index);
3350                 } else {
3351                         fprintf(stderr, "-INVALID-");
3352                 }
3353         }
3354         fprintf(stderr, "  (");
3355         print_type(path->top_type);
3356         fprintf(stderr, ")");
3357 }
3358
3359 static type_path_entry_t *get_type_path_top(const type_path_t *path)
3360 {
3361         size_t len = ARR_LEN(path->path);
3362         assert(len > 0);
3363         return & path->path[len-1];
3364 }
3365
3366 static type_path_entry_t *append_to_type_path(type_path_t *path)
3367 {
3368         size_t len = ARR_LEN(path->path);
3369         ARR_RESIZE(type_path_entry_t, path->path, len+1);
3370
3371         type_path_entry_t *result = & path->path[len];
3372         memset(result, 0, sizeof(result[0]));
3373         return result;
3374 }
3375
3376 static size_t get_compound_member_count(const compound_type_t *type)
3377 {
3378         compound_t *compound  = type->compound;
3379         size_t      n_members = 0;
3380         entity_t   *member    = compound->members.entities;
3381         for ( ; member != NULL; member = member->base.next) {
3382                 ++n_members;
3383         }
3384
3385         return n_members;
3386 }
3387
3388 static ir_initializer_t *get_initializer_entry(type_path_t *path)
3389 {
3390         type_t *orig_top_type = path->top_type;
3391         type_t *top_type      = skip_typeref(orig_top_type);
3392
3393         assert(is_type_compound(top_type) || is_type_array(top_type));
3394
3395         if (ARR_LEN(path->path) == 0) {
3396                 return NULL;
3397         } else {
3398                 type_path_entry_t *top         = get_type_path_top(path);
3399                 ir_initializer_t  *initializer = top->initializer;
3400                 return get_initializer_compound_value(initializer, top->index);
3401         }
3402 }
3403
3404 static void descend_into_subtype(type_path_t *path)
3405 {
3406         type_t *orig_top_type = path->top_type;
3407         type_t *top_type      = skip_typeref(orig_top_type);
3408
3409         assert(is_type_compound(top_type) || is_type_array(top_type));
3410
3411         ir_initializer_t *initializer = get_initializer_entry(path);
3412
3413         type_path_entry_t *top = append_to_type_path(path);
3414         top->type              = top_type;
3415
3416         size_t len;
3417
3418         if (is_type_compound(top_type)) {
3419                 compound_t *const compound = top_type->compound.compound;
3420                 entity_t   *const entry    = skip_unnamed_bitfields(compound->members.entities);
3421
3422                 top->compound_entry = entry;
3423                 top->index          = 0;
3424                 len                 = get_compound_member_count(&top_type->compound);
3425                 if (entry != NULL) {
3426                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3427                         path->top_type = entry->declaration.type;
3428                 }
3429         } else {
3430                 assert(is_type_array(top_type));
3431                 assert(top_type->array.size > 0);
3432
3433                 top->index     = 0;
3434                 path->top_type = top_type->array.element_type;
3435                 len            = top_type->array.size;
3436         }
3437         if (initializer == NULL
3438                         || get_initializer_kind(initializer) == IR_INITIALIZER_NULL) {
3439                 initializer = create_initializer_compound(len);
3440                 /* we have to set the entry at the 2nd latest path entry... */
3441                 size_t path_len = ARR_LEN(path->path);
3442                 assert(path_len >= 1);
3443                 if (path_len > 1) {
3444                         type_path_entry_t *entry        = & path->path[path_len-2];
3445                         ir_initializer_t  *tinitializer = entry->initializer;
3446                         set_initializer_compound_value(tinitializer, entry->index,
3447                                                        initializer);
3448                 }
3449         }
3450         top->initializer = initializer;
3451 }
3452
3453 static void ascend_from_subtype(type_path_t *path)
3454 {
3455         type_path_entry_t *top = get_type_path_top(path);
3456
3457         path->top_type = top->type;
3458
3459         size_t len = ARR_LEN(path->path);
3460         ARR_RESIZE(type_path_entry_t, path->path, len-1);
3461 }
3462
3463 static void walk_designator(type_path_t *path, const designator_t *designator)
3464 {
3465         /* designators start at current object type */
3466         ARR_RESIZE(type_path_entry_t, path->path, 1);
3467
3468         for ( ; designator != NULL; designator = designator->next) {
3469                 type_path_entry_t *top         = get_type_path_top(path);
3470                 type_t            *orig_type   = top->type;
3471                 type_t            *type        = skip_typeref(orig_type);
3472
3473                 if (designator->symbol != NULL) {
3474                         assert(is_type_compound(type));
3475                         size_t    index  = 0;
3476                         symbol_t *symbol = designator->symbol;
3477
3478                         compound_t *compound = type->compound.compound;
3479                         entity_t   *iter     = compound->members.entities;
3480                         for (; iter->base.symbol != symbol; iter = iter->base.next, ++index) {}
3481                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
3482
3483                         /* revert previous initialisations of other union elements */
3484                         if (type->kind == TYPE_COMPOUND_UNION) {
3485                                 ir_initializer_t *initializer = top->initializer;
3486                                 if (initializer != NULL
3487                                         && get_initializer_kind(initializer) == IR_INITIALIZER_COMPOUND) {
3488                                         /* are we writing to a new element? */
3489                                         ir_initializer_t *oldi
3490                                                 = get_initializer_compound_value(initializer, index);
3491                                         if (get_initializer_kind(oldi) == IR_INITIALIZER_NULL) {
3492                                                 /* clear initializer */
3493                                                 size_t len
3494                                                         = get_initializer_compound_n_entries(initializer);
3495                                                 ir_initializer_t *nulli = get_initializer_null();
3496                                                 for (size_t i = 0; i < len; ++i) {
3497                                                         set_initializer_compound_value(initializer, i,
3498                                                                                        nulli);
3499                                                 }
3500                                         }
3501                                 }
3502                         }
3503
3504                         top->type           = orig_type;
3505                         top->compound_entry = iter;
3506                         top->index          = index;
3507                         orig_type           = iter->declaration.type;
3508                 } else {
3509                         expression_t *array_index = designator->array_index;
3510                         assert(is_type_array(type));
3511
3512                         long index = fold_constant_to_int(array_index);
3513                         assert(0 <= index && (!type->array.size_constant || (size_t)index < type->array.size));
3514
3515                         top->type  = orig_type;
3516                         top->index = (size_t) index;
3517                         orig_type  = type->array.element_type;
3518                 }
3519                 path->top_type = orig_type;
3520
3521                 if (designator->next != NULL) {
3522                         descend_into_subtype(path);
3523                 }
3524         }
3525
3526         path->invalid  = false;
3527 }
3528
3529 static void advance_current_object(type_path_t *path)
3530 {
3531         if (path->invalid) {
3532                 /* TODO: handle this... */
3533                 panic("invalid initializer (excessive elements)");
3534         }
3535
3536         type_path_entry_t *top = get_type_path_top(path);
3537
3538         type_t *type = skip_typeref(top->type);
3539         if (is_type_union(type)) {
3540                 /* only the first element is initialized in unions */
3541                 top->compound_entry = NULL;
3542         } else if (is_type_struct(type)) {
3543                 entity_t *entry = top->compound_entry;
3544
3545                 top->index++;
3546                 entry               = skip_unnamed_bitfields(entry->base.next);
3547                 top->compound_entry = entry;
3548                 if (entry != NULL) {
3549                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3550                         path->top_type = entry->declaration.type;
3551                         return;
3552                 }
3553         } else {
3554                 assert(is_type_array(type));
3555
3556                 top->index++;
3557                 if (!type->array.size_constant || top->index < type->array.size) {
3558                         return;
3559                 }
3560         }
3561
3562         /* we're past the last member of the current sub-aggregate, try if we
3563          * can ascend in the type hierarchy and continue with another subobject */
3564         size_t len = ARR_LEN(path->path);
3565
3566         if (len > 1) {
3567                 ascend_from_subtype(path);
3568                 advance_current_object(path);
3569         } else {
3570                 path->invalid = true;
3571         }
3572 }
3573
3574
3575 static ir_initializer_t *create_ir_initializer_value(
3576                 const initializer_value_t *initializer)
3577 {
3578         expression_t *expr = initializer->value;
3579         type_t       *type = skip_typeref(expr->base.type);
3580
3581         if (is_type_compound(type)) {
3582                 if (expr->kind == EXPR_UNARY_CAST) {
3583                         expr = expr->unary.value;
3584                         type = skip_typeref(expr->base.type);
3585                 }
3586                 /* must be a compound literal... */
3587                 if (expr->kind == EXPR_COMPOUND_LITERAL) {
3588                         return create_ir_initializer(expr->compound_literal.initializer,
3589                                                      type);
3590                 }
3591         }
3592
3593         ir_node *value = expression_to_value(expr);
3594         value = conv_to_storage_type(NULL, value, type);
3595         return create_initializer_const(value);
3596 }
3597
3598 /** Tests whether type can be initialized by a string constant */
3599 static bool is_string_type(type_t *type)
3600 {
3601         if (!is_type_array(type))
3602                 return false;
3603
3604         type_t *const inner = skip_typeref(type->array.element_type);
3605         return is_type_integer(inner);
3606 }
3607
3608 static ir_initializer_t *create_ir_initializer_list(
3609                 const initializer_list_t *initializer, type_t *type)
3610 {
3611         type_path_t path;
3612         memset(&path, 0, sizeof(path));
3613         path.top_type = type;
3614         path.path     = NEW_ARR_F(type_path_entry_t, 0);
3615
3616         descend_into_subtype(&path);
3617
3618         for (size_t i = 0; i < initializer->len; ++i) {
3619                 const initializer_t *sub_initializer = initializer->initializers[i];
3620
3621                 if (sub_initializer->kind == INITIALIZER_DESIGNATOR) {
3622                         walk_designator(&path, sub_initializer->designator.designator);
3623                         continue;
3624                 }
3625
3626                 if (sub_initializer->kind == INITIALIZER_VALUE) {
3627                         const expression_t *expr      = sub_initializer->value.value;
3628                         const type_t       *expr_type = skip_typeref(expr->base.type);
3629                         /* we might have to descend into types until the types match */
3630                         while(true) {
3631                                 type_t *orig_top_type = path.top_type;
3632                                 type_t *top_type      = skip_typeref(orig_top_type);
3633
3634                                 if (types_compatible(top_type, expr_type))
3635                                         break;
3636                                 descend_into_subtype(&path);
3637                         }
3638                 } else if (sub_initializer->kind == INITIALIZER_STRING) {
3639                         /* we might have to descend into types until we're at a scalar
3640                          * type */
3641                         while (true) {
3642                                 type_t *orig_top_type = path.top_type;
3643                                 type_t *top_type      = skip_typeref(orig_top_type);
3644
3645                                 if (is_string_type(top_type))
3646                                         break;
3647                                 descend_into_subtype(&path);
3648                         }
3649                 }
3650
3651                 ir_initializer_t *sub_irinitializer
3652                         = create_ir_initializer(sub_initializer, path.top_type);
3653
3654                 size_t path_len = ARR_LEN(path.path);
3655                 assert(path_len >= 1);
3656                 type_path_entry_t *entry        = & path.path[path_len-1];
3657                 ir_initializer_t  *tinitializer = entry->initializer;
3658                 set_initializer_compound_value(tinitializer, entry->index,
3659                                                sub_irinitializer);
3660
3661                 advance_current_object(&path);
3662         }
3663
3664         assert(ARR_LEN(path.path) >= 1);
3665         ir_initializer_t *result = path.path[0].initializer;
3666         DEL_ARR_F(path.path);
3667
3668         return result;
3669 }
3670
3671 static ir_initializer_t *create_ir_initializer_string(initializer_t const *const init, type_t *type)
3672 {
3673         type = skip_typeref(type);
3674
3675         assert(type->kind == TYPE_ARRAY);
3676         assert(type->array.size_constant);
3677         string_literal_expression_t const *const str = get_init_string(init);
3678         size_t            const str_len = str->value.size;
3679         size_t            const arr_len = type->array.size;
3680         ir_initializer_t *const irinit  = create_initializer_compound(arr_len);
3681         ir_mode          *const mode    = get_ir_mode_storage(type->array.element_type);
3682         char const       *      p       = str->value.begin;
3683         switch (str->value.encoding) {
3684         case STRING_ENCODING_CHAR:
3685         case STRING_ENCODING_UTF8:
3686                 for (size_t i = 0; i != arr_len; ++i) {
3687                         char              const c      = i < str_len ? *p++ : 0;
3688                         ir_tarval        *const tv     = new_tarval_from_long(c, mode);
3689                         ir_initializer_t *const tvinit = create_initializer_tarval(tv);
3690                         set_initializer_compound_value(irinit, i, tvinit);
3691                 }
3692                 break;
3693
3694         case STRING_ENCODING_CHAR16:
3695         case STRING_ENCODING_CHAR32:
3696         case STRING_ENCODING_WIDE:
3697                 for (size_t i = 0; i != arr_len; ++i) {
3698                         utf32             const c      = i < str_len ? read_utf8_char(&p) : 0;
3699                         ir_tarval        *const tv     = new_tarval_from_long(c, mode);
3700                         ir_initializer_t *const tvinit = create_initializer_tarval(tv);
3701                         set_initializer_compound_value(irinit, i, tvinit);
3702                 }
3703                 break;
3704         }
3705
3706         return irinit;
3707 }
3708
3709 static ir_initializer_t *create_ir_initializer(
3710                 const initializer_t *initializer, type_t *type)
3711 {
3712         switch(initializer->kind) {
3713                 case INITIALIZER_STRING:
3714                         return create_ir_initializer_string(initializer, type);
3715
3716                 case INITIALIZER_LIST:
3717                         return create_ir_initializer_list(&initializer->list, type);
3718
3719                 case INITIALIZER_VALUE:
3720                         return create_ir_initializer_value(&initializer->value);
3721
3722                 case INITIALIZER_DESIGNATOR:
3723                         panic("unexpected designator initializer");
3724         }
3725         panic("unknown initializer");
3726 }
3727
3728 /** ANSI C §6.7.8:21: If there are fewer initializers [..] than there
3729  *  are elements [...] the remainder of the aggregate shall be initialized
3730  *  implicitly the same as objects that have static storage duration. */
3731 static void create_dynamic_null_initializer(ir_entity *entity, dbg_info *dbgi,
3732                 ir_node *base_addr)
3733 {
3734         /* for unions we must NOT do anything for null initializers */
3735         ir_type *owner = get_entity_owner(entity);
3736         if (is_Union_type(owner)) {
3737                 return;
3738         }
3739
3740         ir_type *ent_type = get_entity_type(entity);
3741         /* create sub-initializers for a compound type */
3742         if (is_compound_type(ent_type)) {
3743                 unsigned n_members = get_compound_n_members(ent_type);
3744                 for (unsigned n = 0; n < n_members; ++n) {
3745                         ir_entity *member = get_compound_member(ent_type, n);
3746                         ir_node   *addr   = new_d_simpleSel(dbgi, new_NoMem(), base_addr,
3747                                                                 member);
3748                         create_dynamic_null_initializer(member, dbgi, addr);
3749                 }
3750                 return;
3751         }
3752         if (is_Array_type(ent_type)) {
3753                 assert(has_array_upper_bound(ent_type, 0));
3754                 long n = get_array_upper_bound_int(ent_type, 0);
3755                 for (long i = 0; i < n; ++i) {
3756                         ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
3757                         ir_tarval *index_tv = new_tarval_from_long(i, mode_uint);
3758                         ir_node   *cnst     = new_d_Const(dbgi, index_tv);
3759                         ir_node   *in[1]    = { cnst };
3760                         ir_entity *arrent   = get_array_element_entity(ent_type);
3761                         ir_node   *addr     = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in,
3762                                                         arrent);
3763                         create_dynamic_null_initializer(arrent, dbgi, addr);
3764                 }
3765                 return;
3766         }
3767
3768         ir_mode *value_mode = get_type_mode(ent_type);
3769         ir_node *node       = new_Const(get_mode_null(value_mode));
3770
3771         /* is it a bitfield type? */
3772         if (is_Primitive_type(ent_type) &&
3773                         get_primitive_base_type(ent_type) != NULL) {
3774                 bitfield_store_to_firm(dbgi, entity, base_addr, node, false, false);
3775                 return;
3776         }
3777
3778         ir_node *mem    = get_store();
3779         ir_node *store  = new_d_Store(dbgi, mem, base_addr, node, cons_none);
3780         ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
3781         set_store(proj_m);
3782 }
3783
3784 static void create_dynamic_initializer_sub(ir_initializer_t *initializer,
3785                 ir_entity *entity, ir_type *type, dbg_info *dbgi, ir_node *base_addr)
3786 {
3787         switch(get_initializer_kind(initializer)) {
3788         case IR_INITIALIZER_NULL:
3789                 create_dynamic_null_initializer(entity, dbgi, base_addr);
3790                 return;
3791         case IR_INITIALIZER_CONST: {
3792                 ir_node *node     = get_initializer_const_value(initializer);
3793                 ir_type *ent_type = get_entity_type(entity);
3794
3795                 /* is it a bitfield type? */
3796                 if (is_Primitive_type(ent_type) &&
3797                                 get_primitive_base_type(ent_type) != NULL) {
3798                         bitfield_store_to_firm(dbgi, entity, base_addr, node, false, false);
3799                         return;
3800                 }
3801
3802                 ir_node *mem = get_store();
3803                 ir_node *new_mem;
3804                 if (is_compound_type(ent_type)) {
3805                         ir_node *copyb = new_d_CopyB(dbgi, mem, base_addr, node, ent_type);
3806                         new_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
3807                 } else {
3808                         assert(get_type_mode(type) == get_irn_mode(node));
3809                         ir_node *store = new_d_Store(dbgi, mem, base_addr, node, cons_none);
3810                         new_mem = new_Proj(store, mode_M, pn_Store_M);
3811                 }
3812                 set_store(new_mem);
3813                 return;
3814         }
3815         case IR_INITIALIZER_TARVAL: {
3816                 ir_tarval *tv       = get_initializer_tarval_value(initializer);
3817                 ir_node   *cnst     = new_d_Const(dbgi, tv);
3818                 ir_type   *ent_type = get_entity_type(entity);
3819
3820                 /* is it a bitfield type? */
3821                 if (is_Primitive_type(ent_type) &&
3822                                 get_primitive_base_type(ent_type) != NULL) {
3823                         bitfield_store_to_firm(dbgi, entity, base_addr, cnst, false, false);
3824                         return;
3825                 }
3826
3827                 assert(get_type_mode(type) == get_tarval_mode(tv));
3828                 ir_node *mem    = get_store();
3829                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, cnst, cons_none);
3830                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
3831                 set_store(proj_m);
3832                 return;
3833         }
3834         case IR_INITIALIZER_COMPOUND: {
3835                 assert(is_compound_type(type) || is_Array_type(type));
3836                 int n_members;
3837                 if (is_Array_type(type)) {
3838                         assert(has_array_upper_bound(type, 0));
3839                         n_members = get_array_upper_bound_int(type, 0);
3840                 } else {
3841                         n_members = get_compound_n_members(type);
3842                 }
3843
3844                 if (get_initializer_compound_n_entries(initializer)
3845                                 != (unsigned) n_members)
3846                         panic("initializer doesn't match compound type");
3847
3848                 for (int i = 0; i < n_members; ++i) {
3849                         ir_node   *addr;
3850                         ir_type   *irtype;
3851                         ir_entity *sub_entity;
3852                         if (is_Array_type(type)) {
3853                                 ir_mode   *mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
3854                                 ir_tarval *index_tv = new_tarval_from_long(i, mode_uint);
3855                                 ir_node   *cnst     = new_d_Const(dbgi, index_tv);
3856                                 ir_node   *in[1]    = { cnst };
3857                                 irtype     = get_array_element_type(type);
3858                                 sub_entity = get_array_element_entity(type);
3859                                 addr       = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in,
3860                                                        sub_entity);
3861                         } else {
3862                                 sub_entity = get_compound_member(type, i);
3863                                 irtype     = get_entity_type(sub_entity);
3864                                 addr       = new_d_simpleSel(dbgi, new_NoMem(), base_addr,
3865                                                              sub_entity);
3866                         }
3867
3868                         ir_initializer_t *sub_init
3869                                 = get_initializer_compound_value(initializer, i);
3870
3871                         create_dynamic_initializer_sub(sub_init, sub_entity, irtype, dbgi,
3872                                                        addr);
3873                 }
3874                 return;
3875         }
3876         }
3877
3878         panic("invalid ir_initializer");
3879 }
3880
3881 static void create_dynamic_initializer(ir_initializer_t *initializer,
3882                 dbg_info *dbgi, ir_entity *entity)
3883 {
3884         ir_node *frame     = get_irg_frame(current_ir_graph);
3885         ir_node *base_addr = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
3886         ir_type *type      = get_entity_type(entity);
3887
3888         create_dynamic_initializer_sub(initializer, entity, type, dbgi, base_addr);
3889 }
3890
3891 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
3892                                      ir_entity *entity, type_t *type)
3893 {
3894         ir_node *memory = get_store();
3895         ir_node *nomem  = new_NoMem();
3896         ir_node *frame  = get_irg_frame(current_ir_graph);
3897         ir_node *addr   = new_d_simpleSel(dbgi, nomem, frame, entity);
3898
3899         if (initializer->kind == INITIALIZER_VALUE) {
3900                 initializer_value_t *initializer_value = &initializer->value;
3901
3902                 ir_node *value = expression_to_value(initializer_value->value);
3903                 type = skip_typeref(type);
3904                 assign_value(dbgi, addr, type, value);
3905                 return;
3906         }
3907
3908         if (is_constant_initializer(initializer) == EXPR_CLASS_VARIABLE) {
3909                 ir_initializer_t *irinitializer
3910                         = create_ir_initializer(initializer, type);
3911
3912                 create_dynamic_initializer(irinitializer, dbgi, entity);
3913                 return;
3914         }
3915
3916         /* create a "template" entity which is copied to the entity on the stack */
3917         ir_entity *const init_entity
3918                 = create_initializer_entity(dbgi, initializer, type);
3919         ir_node *const src_addr = create_symconst(dbgi, init_entity);
3920         ir_type *const irtype   = get_ir_type(type);
3921         ir_node *const copyb    = new_d_CopyB(dbgi, memory, addr, src_addr, irtype);
3922
3923         ir_node *const copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
3924         set_store(copyb_mem);
3925 }
3926
3927 static void create_initializer_local_variable_entity(entity_t *entity)
3928 {
3929         assert(entity->kind == ENTITY_VARIABLE);
3930         initializer_t *initializer = entity->variable.initializer;
3931         dbg_info      *dbgi        = get_dbg_info(&entity->base.pos);
3932         ir_entity     *irentity    = entity->variable.v.entity;
3933         type_t        *type        = entity->declaration.type;
3934
3935         create_local_initializer(initializer, dbgi, irentity, type);
3936 }
3937
3938 static void create_variable_initializer(entity_t *entity)
3939 {
3940         assert(entity->kind == ENTITY_VARIABLE);
3941         initializer_t *initializer = entity->variable.initializer;
3942         if (initializer == NULL)
3943                 return;
3944
3945         declaration_kind_t declaration_kind
3946                 = (declaration_kind_t) entity->declaration.kind;
3947         if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY) {
3948                 create_initializer_local_variable_entity(entity);
3949                 return;
3950         }
3951
3952         type_t            *type = entity->declaration.type;
3953         type_qualifiers_t  tq   = get_type_qualifier(type, true);
3954
3955         if (initializer->kind == INITIALIZER_VALUE) {
3956                 expression_t *      value     = initializer->value.value;
3957                 type_t       *const init_type = skip_typeref(value->base.type);
3958
3959                 if (!is_type_scalar(init_type)) {
3960                         if (value->kind != EXPR_COMPOUND_LITERAL)
3961                                 panic("expected non-scalar initializer to be a compound literal");
3962                         initializer = value->compound_literal.initializer;
3963                         goto have_initializer;
3964                 }
3965
3966                 ir_node  *      node = expression_to_value(value);
3967                 dbg_info *const dbgi = get_dbg_info(&entity->base.pos);
3968                 node = conv_to_storage_type(dbgi, node, init_type);
3969
3970                 if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE) {
3971                         set_value(entity->variable.v.value_number, node);
3972                 } else {
3973                         assert(declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
3974
3975                         ir_entity *irentity = entity->variable.v.entity;
3976
3977                         if (tq & TYPE_QUALIFIER_CONST
3978                                         && get_entity_owner(irentity) != get_tls_type()) {
3979                                 add_entity_linkage(irentity, IR_LINKAGE_CONSTANT);
3980                         }
3981                         set_atomic_ent_value(irentity, node);
3982                 }
3983         } else {
3984 have_initializer:
3985                 assert(declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY ||
3986                        declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
3987
3988                 ir_entity        *irentity        = entity->variable.v.entity;
3989                 ir_initializer_t *irinitializer
3990                         = create_ir_initializer(initializer, type);
3991
3992                 if (tq & TYPE_QUALIFIER_CONST) {
3993                         add_entity_linkage(irentity, IR_LINKAGE_CONSTANT);
3994                 }
3995                 set_entity_initializer(irentity, irinitializer);
3996         }
3997 }
3998
3999 static void create_variable_length_array(entity_t *entity)
4000 {
4001         assert(entity->kind == ENTITY_VARIABLE);
4002         assert(entity->variable.initializer == NULL);
4003
4004         entity->declaration.kind    = DECLARATION_KIND_VARIABLE_LENGTH_ARRAY;
4005         entity->variable.v.vla_base = NULL;
4006
4007         /* TODO: record VLA somewhere so we create the free node when we leave
4008          * it's scope */
4009 }
4010
4011 static void allocate_variable_length_array(entity_t *entity)
4012 {
4013         assert(entity->kind == ENTITY_VARIABLE);
4014         assert(entity->variable.initializer == NULL);
4015         assert(currently_reachable());
4016
4017         dbg_info *dbgi      = get_dbg_info(&entity->base.pos);
4018         type_t   *type      = entity->declaration.type;
4019         ir_type  *el_type   = get_ir_type(type->array.element_type);
4020
4021         /* make sure size_node is calculated */
4022         get_type_size_node(type);
4023         ir_node  *elems = type->array.size_node;
4024         ir_node  *mem   = get_store();
4025         ir_node  *alloc = new_d_Alloc(dbgi, mem, elems, el_type, stack_alloc);
4026
4027         ir_node  *proj_m = new_d_Proj(dbgi, alloc, mode_M, pn_Alloc_M);
4028         ir_node  *addr   = new_d_Proj(dbgi, alloc, mode_P_data, pn_Alloc_res);
4029         set_store(proj_m);
4030
4031         assert(entity->declaration.kind == DECLARATION_KIND_VARIABLE_LENGTH_ARRAY);
4032         entity->variable.v.vla_base = addr;
4033 }
4034
4035 static bool var_needs_entity(variable_t const *const var)
4036 {
4037         if (var->address_taken)
4038                 return true;
4039         type_t *const type = skip_typeref(var->base.type);
4040         return !is_type_scalar(type) || type->base.qualifiers & TYPE_QUALIFIER_VOLATILE;
4041 }
4042
4043 /**
4044  * Creates a Firm local variable from a declaration.
4045  */
4046 static void create_local_variable(entity_t *entity)
4047 {
4048         assert(entity->kind == ENTITY_VARIABLE);
4049         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4050
4051         if (!var_needs_entity(&entity->variable)) {
4052                 entity->declaration.kind        = DECLARATION_KIND_LOCAL_VARIABLE;
4053                 entity->variable.v.value_number = next_value_number_function;
4054                 set_irg_loc_description(current_ir_graph, next_value_number_function, entity);
4055                 ++next_value_number_function;
4056                 return;
4057         }
4058
4059         /* is it a variable length array? */
4060         type_t *const type = skip_typeref(entity->declaration.type);
4061         if (is_type_array(type) && !type->array.size_constant) {
4062                 create_variable_length_array(entity);
4063                 return;
4064         }
4065
4066         ir_type *const frame_type = get_irg_frame_type(current_ir_graph);
4067         create_variable_entity(entity, DECLARATION_KIND_LOCAL_VARIABLE_ENTITY, frame_type);
4068 }
4069
4070 static void create_local_static_variable(entity_t *entity)
4071 {
4072         assert(entity->kind == ENTITY_VARIABLE);
4073         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4074
4075         type_t   *type           = skip_typeref(entity->declaration.type);
4076         ir_type  *const var_type = entity->variable.thread_local ?
4077                 get_tls_type() : get_glob_type();
4078         ir_type  *const irtype   = get_ir_type(type);
4079         dbg_info *const dbgi     = get_dbg_info(&entity->base.pos);
4080
4081         size_t l = strlen(entity->base.symbol->string);
4082         char   buf[l + sizeof(".%u")];
4083         snprintf(buf, sizeof(buf), "%s.%%u", entity->base.symbol->string);
4084         ident     *const id       = id_unique(buf);
4085         ir_entity *const irentity = new_d_entity(var_type, id, irtype, dbgi);
4086
4087         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
4088                 set_entity_volatility(irentity, volatility_is_volatile);
4089         }
4090
4091         entity->declaration.kind  = DECLARATION_KIND_GLOBAL_VARIABLE;
4092         entity->variable.v.entity = irentity;
4093
4094         set_entity_ld_ident(irentity, id);
4095         set_entity_visibility(irentity, ir_visibility_local);
4096
4097         if (entity->variable.initializer == NULL) {
4098                 ir_initializer_t *null_init = get_initializer_null();
4099                 set_entity_initializer(irentity, null_init);
4100         }
4101
4102         PUSH_IRG(get_const_code_irg());
4103         create_variable_initializer(entity);
4104         POP_IRG();
4105 }
4106
4107
4108
4109 static ir_node *return_statement_to_firm(return_statement_t *statement)
4110 {
4111         if (!currently_reachable())
4112                 return NULL;
4113
4114         dbg_info *const dbgi = get_dbg_info(&statement->base.pos);
4115         type_t   *const type = skip_typeref(current_function_entity->declaration.type->function.return_type);
4116         ir_node  *      res  = statement->value ? expression_to_value(statement->value) : NULL;
4117
4118         int in_len;
4119         if (!is_type_void(type)) {
4120                 if (res) {
4121                         res = conv_to_storage_type(dbgi, res, type);
4122                 } else {
4123                         res = new_Unknown(get_ir_mode_storage(type));
4124                 }
4125                 in_len = 1;
4126         } else {
4127                 in_len = 0;
4128         }
4129
4130         ir_node *const in[1] = { res };
4131         ir_node *const store = get_store();
4132         ir_node *const ret   = new_d_Return(dbgi, store, in_len, in);
4133
4134         ir_node *end_block = get_irg_end_block(current_ir_graph);
4135         add_immBlock_pred(end_block, ret);
4136
4137         set_unreachable_now();
4138         return NULL;
4139 }
4140
4141 static ir_node *expression_statement_to_firm(expression_statement_t *statement)
4142 {
4143         if (!currently_reachable())
4144                 return NULL;
4145
4146         return expression_to_value(statement->expression);
4147 }
4148
4149 static void create_local_declarations(entity_t*);
4150
4151 static ir_node *compound_statement_to_firm(compound_statement_t *compound)
4152 {
4153         create_local_declarations(compound->scope.entities);
4154
4155         ir_node     *result    = NULL;
4156         statement_t *statement = compound->statements;
4157         for ( ; statement != NULL; statement = statement->base.next) {
4158                 result = statement_to_firm(statement);
4159         }
4160
4161         return result;
4162 }
4163
4164 static void create_global_variable(entity_t *entity)
4165 {
4166         ir_linkage          linkage    = IR_LINKAGE_DEFAULT;
4167         ir_visibility       visibility = ir_visibility_external;
4168         storage_class_tag_t storage
4169                 = (storage_class_tag_t)entity->declaration.storage_class;
4170         decl_modifiers_t    modifiers  = entity->declaration.modifiers;
4171         assert(entity->kind == ENTITY_VARIABLE);
4172
4173         switch (storage) {
4174         case STORAGE_CLASS_EXTERN: visibility = ir_visibility_external; break;
4175         case STORAGE_CLASS_STATIC: visibility = ir_visibility_local;    break;
4176         case STORAGE_CLASS_NONE:   visibility = ir_visibility_external; break;
4177         case STORAGE_CLASS_TYPEDEF:
4178         case STORAGE_CLASS_AUTO:
4179         case STORAGE_CLASS_REGISTER:
4180                 panic("invalid storage class for global var");
4181         }
4182
4183         /* "common" symbols */
4184         if (storage == STORAGE_CLASS_NONE
4185             && entity->variable.initializer == NULL
4186             && !entity->variable.thread_local
4187             && (modifiers & DM_WEAK) == 0) {
4188                 linkage |= IR_LINKAGE_MERGE;
4189         }
4190
4191         ir_type *var_type = get_glob_type();
4192         if (entity->variable.thread_local) {
4193                 var_type = get_tls_type();
4194         }
4195         create_variable_entity(entity, DECLARATION_KIND_GLOBAL_VARIABLE, var_type);
4196         ir_entity *irentity = entity->variable.v.entity;
4197         add_entity_linkage(irentity, linkage);
4198         set_entity_visibility(irentity, visibility);
4199         if (entity->variable.initializer == NULL
4200             && storage != STORAGE_CLASS_EXTERN) {
4201                 ir_initializer_t *null_init = get_initializer_null();
4202                 set_entity_initializer(irentity, null_init);
4203         }
4204 }
4205
4206 static void create_local_declaration(entity_t *entity)
4207 {
4208         assert(is_declaration(entity));
4209
4210         /* construct type */
4211         (void) get_ir_type(entity->declaration.type);
4212         if (entity->base.symbol == NULL) {
4213                 return;
4214         }
4215
4216         switch ((storage_class_tag_t) entity->declaration.storage_class) {
4217         case STORAGE_CLASS_STATIC:
4218                 if (entity->kind == ENTITY_FUNCTION) {
4219                         (void)get_function_entity(entity, NULL);
4220                 } else {
4221                         create_local_static_variable(entity);
4222                 }
4223                 return;
4224         case STORAGE_CLASS_EXTERN:
4225                 if (entity->kind == ENTITY_FUNCTION) {
4226                         assert(entity->function.body == NULL);
4227                         (void)get_function_entity(entity, NULL);
4228                 } else {
4229                         create_global_variable(entity);
4230                         create_variable_initializer(entity);
4231                 }
4232                 return;
4233         case STORAGE_CLASS_NONE:
4234         case STORAGE_CLASS_AUTO:
4235         case STORAGE_CLASS_REGISTER:
4236                 if (entity->kind == ENTITY_FUNCTION) {
4237                         if (entity->function.body != NULL) {
4238                                 ir_type *owner = get_irg_frame_type(current_ir_graph);
4239                                 (void)get_function_entity(entity, owner);
4240                                 entity->declaration.kind = DECLARATION_KIND_INNER_FUNCTION;
4241                                 enqueue_inner_function(entity);
4242                         } else {
4243                                 (void)get_function_entity(entity, NULL);
4244                         }
4245                 } else {
4246                         create_local_variable(entity);
4247                 }
4248                 return;
4249         case STORAGE_CLASS_TYPEDEF:
4250                 break;
4251         }
4252         panic("invalid storage class");
4253 }
4254
4255 static void create_local_declarations(entity_t *e)
4256 {
4257         for (; e; e = e->base.next) {
4258                 if (is_declaration(e))
4259                         create_local_declaration(e);
4260         }
4261 }
4262
4263 static void initialize_local_declaration(entity_t *entity)
4264 {
4265         if (entity->base.symbol == NULL)
4266                 return;
4267
4268         // no need to emit code in dead blocks
4269         if (entity->declaration.storage_class != STORAGE_CLASS_STATIC
4270                         && !currently_reachable())
4271                 return;
4272
4273         switch ((declaration_kind_t) entity->declaration.kind) {
4274         case DECLARATION_KIND_LOCAL_VARIABLE:
4275         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY:
4276                 create_variable_initializer(entity);
4277                 return;
4278
4279         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
4280                 allocate_variable_length_array(entity);
4281                 return;
4282
4283         case DECLARATION_KIND_COMPOUND_MEMBER:
4284         case DECLARATION_KIND_GLOBAL_VARIABLE:
4285         case DECLARATION_KIND_FUNCTION:
4286         case DECLARATION_KIND_INNER_FUNCTION:
4287                 return;
4288
4289         case DECLARATION_KIND_PARAMETER:
4290         case DECLARATION_KIND_PARAMETER_ENTITY:
4291                 panic("can't initialize parameters");
4292
4293         case DECLARATION_KIND_UNKNOWN:
4294                 panic("can't initialize unknown declaration");
4295         }
4296         panic("invalid declaration kind");
4297 }
4298
4299 static ir_node *declaration_statement_to_firm(declaration_statement_t *statement)
4300 {
4301         entity_t *entity = statement->declarations_begin;
4302         if (entity == NULL)
4303                 return NULL;
4304
4305         entity_t *const last = statement->declarations_end;
4306         for ( ;; entity = entity->base.next) {
4307                 if (is_declaration(entity)) {
4308                         initialize_local_declaration(entity);
4309                 } else if (entity->kind == ENTITY_TYPEDEF) {
4310                         /* §6.7.7:3  Any array size expressions associated with variable length
4311                          * array declarators are evaluated each time the declaration of the
4312                          * typedef name is reached in the order of execution. */
4313                         type_t *const type = skip_typeref(entity->typedefe.type);
4314                         if (is_type_array(type) && type->array.is_vla)
4315                                 get_vla_size(&type->array);
4316                 }
4317                 if (entity == last)
4318                         break;
4319         }
4320
4321         return NULL;
4322 }
4323
4324 static ir_node *if_statement_to_firm(if_statement_t *statement)
4325 {
4326         create_local_declarations(statement->scope.entities);
4327
4328         /* Create the condition. */
4329         jump_target true_target;
4330         jump_target false_target;
4331         init_jump_target(&true_target,  NULL);
4332         init_jump_target(&false_target, NULL);
4333         if (currently_reachable())
4334                 expression_to_control_flow(statement->condition, &true_target, &false_target);
4335
4336         jump_target exit_target;
4337         init_jump_target(&exit_target, NULL);
4338
4339         /* Create the true statement. */
4340         enter_jump_target(&true_target);
4341         statement_to_firm(statement->true_statement);
4342         jump_to_target(&exit_target);
4343
4344         /* Create the false statement. */
4345         enter_jump_target(&false_target);
4346         if (statement->false_statement)
4347                 statement_to_firm(statement->false_statement);
4348         jump_to_target(&exit_target);
4349
4350         enter_jump_target(&exit_target);
4351         return NULL;
4352 }
4353
4354 static ir_node *do_while_statement_to_firm(do_while_statement_t *statement)
4355 {
4356         create_local_declarations(statement->scope.entities);
4357
4358         PUSH_BREAK(NULL);
4359         PUSH_CONTINUE(NULL);
4360
4361         expression_t *const cond = statement->condition;
4362         /* Avoid an explicit body block in case of do ... while (0);. */
4363         if (is_constant_expression(cond) == EXPR_CLASS_CONSTANT && !fold_constant_to_bool(cond)) {
4364                 /* do ... while (0);. */
4365                 statement_to_firm(statement->body);
4366                 jump_to_target(&continue_target);
4367                 enter_jump_target(&continue_target);
4368                 jump_to_target(&break_target);
4369         } else {
4370                 jump_target body_target;
4371                 init_jump_target(&body_target, NULL);
4372                 jump_to_target(&body_target);
4373                 enter_immature_jump_target(&body_target);
4374                 keep_loop();
4375                 statement_to_firm(statement->body);
4376                 jump_to_target(&continue_target);
4377                 if (enter_jump_target(&continue_target))
4378                         expression_to_control_flow(statement->condition, &body_target, &break_target);
4379                 enter_jump_target(&body_target);
4380         }
4381         enter_jump_target(&break_target);
4382
4383         POP_CONTINUE();
4384         POP_BREAK();
4385         return NULL;
4386 }
4387
4388 static ir_node *for_statement_to_firm(for_statement_t *statement)
4389 {
4390         create_local_declarations(statement->scope.entities);
4391
4392         if (currently_reachable()) {
4393                 entity_t *entity = statement->scope.entities;
4394                 for ( ; entity != NULL; entity = entity->base.next) {
4395                         if (!is_declaration(entity))
4396                                 continue;
4397
4398                         initialize_local_declaration(entity);
4399                 }
4400
4401                 if (statement->initialisation != NULL) {
4402                         expression_to_value(statement->initialisation);
4403                 }
4404         }
4405
4406         /* Create the header block */
4407         jump_target header_target;
4408         init_jump_target(&header_target, NULL);
4409         jump_to_target(&header_target);
4410         enter_immature_jump_target(&header_target);
4411         keep_loop();
4412
4413         expression_t *const step = statement->step;
4414         PUSH_BREAK(NULL);
4415         PUSH_CONTINUE(step ? NULL : header_target.block);
4416
4417         /* Create the condition. */
4418         expression_t *const cond = statement->condition;
4419         if (cond && (is_constant_expression(cond) != EXPR_CLASS_CONSTANT || !fold_constant_to_bool(cond))) {
4420                 jump_target body_target;
4421                 init_jump_target(&body_target, NULL);
4422                 expression_to_control_flow(cond, &body_target, &break_target);
4423                 enter_jump_target(&body_target);
4424         }
4425
4426         /* Create the loop body. */
4427         statement_to_firm(statement->body);
4428         jump_to_target(&continue_target);
4429
4430         /* Create the step code. */
4431         if (step && enter_jump_target(&continue_target)) {
4432                 expression_to_value(step);
4433                 jump_to_target(&header_target);
4434         }
4435
4436         enter_jump_target(&header_target);
4437         enter_jump_target(&break_target);
4438
4439         POP_CONTINUE();
4440         POP_BREAK();
4441         return NULL;
4442 }
4443
4444 static ir_switch_table *create_switch_table(const switch_statement_t *statement)
4445 {
4446         /* determine number of cases */
4447         size_t n_cases = 0;
4448         for (case_label_statement_t *l = statement->first_case; l != NULL;
4449              l = l->next) {
4450                 /* default case */
4451                 if (l->expression == NULL)
4452                         continue;
4453                 if (l->is_empty_range)
4454                         continue;
4455                 ++n_cases;
4456         }
4457
4458         ir_switch_table *res = ir_new_switch_table(current_ir_graph, n_cases);
4459         size_t           i   = 0;
4460         for (case_label_statement_t *l = statement->first_case; l != NULL;
4461              l = l->next) {
4462             if (l->expression == NULL) {
4463                         l->pn = pn_Switch_default;
4464                         continue;
4465                 }
4466                 if (l->is_empty_range)
4467                         continue;
4468                 ir_tarval *min = l->first_case;
4469                 ir_tarval *max = l->last_case;
4470                 long       pn  = (long) i+1;
4471                 ir_switch_table_set(res, i++, min, max, pn);
4472                 l->pn = pn;
4473         }
4474         return res;
4475 }
4476
4477 static ir_node *switch_statement_to_firm(switch_statement_t *statement)
4478 {
4479         dbg_info *dbgi        = get_dbg_info(&statement->base.pos);
4480         ir_node  *switch_node = NULL;
4481
4482         if (currently_reachable()) {
4483                 ir_node *expression = expression_to_value(statement->expression);
4484                 ir_switch_table *table = create_switch_table(statement);
4485                 unsigned n_outs = (unsigned)ir_switch_table_get_n_entries(table) + 1;
4486
4487                 switch_node = new_d_Switch(dbgi, expression, n_outs, table);
4488         }
4489
4490         set_unreachable_now();
4491
4492         PUSH_BREAK(NULL);
4493         ir_node *const old_switch            = current_switch;
4494         const bool     old_saw_default_label = saw_default_label;
4495         saw_default_label                    = false;
4496         current_switch                       = switch_node;
4497
4498         statement_to_firm(statement->body);
4499         jump_to_target(&break_target);
4500
4501         if (!saw_default_label && switch_node) {
4502                 ir_node *proj = new_d_Proj(dbgi, switch_node, mode_X, pn_Switch_default);
4503                 add_pred_to_jump_target(&break_target, proj);
4504         }
4505
4506         enter_jump_target(&break_target);
4507
4508         assert(current_switch == switch_node);
4509         current_switch    = old_switch;
4510         saw_default_label = old_saw_default_label;
4511         POP_BREAK();
4512         return NULL;
4513 }
4514
4515 static ir_node *case_label_to_firm(const case_label_statement_t *statement)
4516 {
4517         if (current_switch != NULL && !statement->is_empty_range) {
4518                 jump_target case_target;
4519                 init_jump_target(&case_target, NULL);
4520
4521                 /* Fallthrough from previous case */
4522                 jump_to_target(&case_target);
4523
4524                 ir_node *const proj = new_Proj(current_switch, mode_X, statement->pn);
4525                 add_pred_to_jump_target(&case_target, proj);
4526                 if (statement->expression == NULL)
4527                         saw_default_label = true;
4528
4529                 enter_jump_target(&case_target);
4530         }
4531
4532         return statement_to_firm(statement->statement);
4533 }
4534
4535 static ir_node *label_to_firm(const label_statement_t *statement)
4536 {
4537         label_t *const label = statement->label;
4538         prepare_label_target(label);
4539         jump_to_target(&label->target);
4540         if (--label->n_users == 0) {
4541                 enter_jump_target(&label->target);
4542         } else {
4543                 enter_immature_jump_target(&label->target);
4544                 keep_loop();
4545         }
4546
4547         return statement_to_firm(statement->statement);
4548 }
4549
4550 static ir_node *goto_statement_to_firm(goto_statement_t *const stmt)
4551 {
4552         label_t *const label = stmt->label;
4553         prepare_label_target(label);
4554         jump_to_target(&label->target);
4555         if (--label->n_users == 0)
4556                 enter_jump_target(&label->target);
4557         set_unreachable_now();
4558         return NULL;
4559 }
4560
4561 static ir_node *computed_goto_to_firm(computed_goto_statement_t const *const statement)
4562 {
4563         if (currently_reachable()) {
4564                 ir_node *const op = expression_to_value(statement->expression);
4565                 ARR_APP1(ir_node*, ijmp_ops, op);
4566                 jump_to_target(&ijmp_target);
4567                 set_unreachable_now();
4568         }
4569         return NULL;
4570 }
4571
4572 static ir_node *asm_statement_to_firm(const asm_statement_t *statement)
4573 {
4574         bool           needs_memory = statement->is_volatile;
4575         size_t         n_clobbers   = 0;
4576         asm_clobber_t *clobber      = statement->clobbers;
4577         for ( ; clobber != NULL; clobber = clobber->next) {
4578                 const char *clobber_str = clobber->clobber.begin;
4579
4580                 if (!be_is_valid_clobber(clobber_str)) {
4581                         errorf(&statement->base.pos,
4582                                    "invalid clobber '%s' specified", clobber->clobber);
4583                         continue;
4584                 }
4585
4586                 if (streq(clobber_str, "memory")) {
4587                         needs_memory = true;
4588                         continue;
4589                 }
4590
4591                 ident *id = new_id_from_str(clobber_str);
4592                 obstack_ptr_grow(&asm_obst, id);
4593                 ++n_clobbers;
4594         }
4595         assert(obstack_object_size(&asm_obst) == n_clobbers * sizeof(ident*));
4596         ident **clobbers = NULL;
4597         if (n_clobbers > 0) {
4598                 clobbers = obstack_finish(&asm_obst);
4599         }
4600
4601         size_t n_inputs  = 0;
4602         asm_argument_t *argument = statement->inputs;
4603         for ( ; argument != NULL; argument = argument->next)
4604                 n_inputs++;
4605         size_t n_outputs = 0;
4606         argument = statement->outputs;
4607         for ( ; argument != NULL; argument = argument->next)
4608                 n_outputs++;
4609
4610         unsigned next_pos = 0;
4611
4612         ir_node *ins[n_inputs + n_outputs + 1];
4613         size_t   in_size = 0;
4614
4615         ir_asm_constraint tmp_in_constraints[n_outputs];
4616
4617         const expression_t *out_exprs[n_outputs];
4618         ir_node            *out_addrs[n_outputs];
4619         size_t              out_size = 0;
4620
4621         argument = statement->outputs;
4622         for ( ; argument != NULL; argument = argument->next) {
4623                 const char *constraints = argument->constraints.begin;
4624                 asm_constraint_flags_t asm_flags
4625                         = be_parse_asm_constraints(constraints);
4626
4627                 {
4628                         position_t const *const pos = &statement->base.pos;
4629                         if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
4630                                 warningf(WARN_OTHER, pos, "some constraints in '%s' are not supported", constraints);
4631                         }
4632                         if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
4633                                 errorf(pos, "some constraints in '%s' are invalid", constraints);
4634                                 continue;
4635                         }
4636                         if (! (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE)) {
4637                                 errorf(pos, "no write flag specified for output constraints '%s'", constraints);
4638                                 continue;
4639                         }
4640                 }
4641
4642                 unsigned pos = next_pos++;
4643                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
4644                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
4645                         expression_t *expr = argument->expression;
4646                         ir_node      *addr = expression_to_addr(expr);
4647                         /* in+output, construct an artifical same_as constraint on the
4648                          * input */
4649                         if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_READ) {
4650                                 char     buf[64];
4651                                 ir_node *value = get_value_from_lvalue(expr, addr);
4652
4653                                 snprintf(buf, sizeof(buf), "%u", (unsigned) out_size);
4654
4655                                 ir_asm_constraint constraint;
4656                                 constraint.pos              = pos;
4657                                 constraint.constraint       = new_id_from_str(buf);
4658                                 constraint.mode             = get_ir_mode_storage(expr->base.type);
4659                                 tmp_in_constraints[in_size] = constraint;
4660                                 ins[in_size] = value;
4661
4662                                 ++in_size;
4663                         }
4664
4665                         out_exprs[out_size] = expr;
4666                         out_addrs[out_size] = addr;
4667                         ++out_size;
4668                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
4669                         /* pure memory ops need no input (but we have to make sure we
4670                          * attach to the memory) */
4671                         assert(! (asm_flags &
4672                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
4673                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
4674                         needs_memory = true;
4675
4676                         /* we need to attach the address to the inputs */
4677                         expression_t *expr = argument->expression;
4678
4679                         ir_asm_constraint constraint;
4680                         constraint.pos              = pos;
4681                         constraint.constraint       = new_id_from_str(constraints);
4682                         constraint.mode             = mode_M;
4683                         tmp_in_constraints[in_size] = constraint;
4684
4685                         ins[in_size] = expression_to_addr(expr);
4686                         ++in_size;
4687                         continue;
4688                 } else {
4689                         errorf(&statement->base.pos,
4690                                "only modifiers but no place set in constraints '%s'",
4691                                constraints);
4692                         continue;
4693                 }
4694
4695                 ir_asm_constraint constraint;
4696                 constraint.pos        = pos;
4697                 constraint.constraint = new_id_from_str(constraints);
4698                 constraint.mode       = get_ir_mode_storage(argument->expression->base.type);
4699
4700                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
4701         }
4702         assert(obstack_object_size(&asm_obst)
4703                         == out_size * sizeof(ir_asm_constraint));
4704         ir_asm_constraint *output_constraints = obstack_finish(&asm_obst);
4705
4706
4707         obstack_grow(&asm_obst, tmp_in_constraints,
4708                      in_size * sizeof(tmp_in_constraints[0]));
4709         /* find and count input and output arguments */
4710         argument = statement->inputs;
4711         for ( ; argument != NULL; argument = argument->next) {
4712                 const char *constraints = argument->constraints.begin;
4713                 asm_constraint_flags_t asm_flags
4714                         = be_parse_asm_constraints(constraints);
4715
4716                 if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
4717                         errorf(&statement->base.pos,
4718                                "some constraints in '%s' are not supported", constraints);
4719                         continue;
4720                 }
4721                 if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
4722                         errorf(&statement->base.pos,
4723                                "some constraints in '%s' are invalid", constraints);
4724                         continue;
4725                 }
4726                 if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE) {
4727                         errorf(&statement->base.pos,
4728                                "write flag specified for input constraints '%s'",
4729                                constraints);
4730                         continue;
4731                 }
4732
4733                 ir_node *input;
4734                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
4735                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
4736                         /* we can treat this as "normal" input */
4737                         input = expression_to_value(argument->expression);
4738                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
4739                         /* pure memory ops need no input (but we have to make sure we
4740                          * attach to the memory) */
4741                         assert(! (asm_flags &
4742                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
4743                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
4744                         needs_memory = true;
4745                         input = expression_to_addr(argument->expression);
4746                 } else {
4747                         errorf(&statement->base.pos,
4748                                "only modifiers but no place set in constraints '%s'",
4749                                constraints);
4750                         continue;
4751                 }
4752
4753                 ir_asm_constraint constraint;
4754                 constraint.pos        = next_pos++;
4755                 constraint.constraint = new_id_from_str(constraints);
4756                 constraint.mode       = get_irn_mode(input);
4757
4758                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
4759                 ins[in_size++] = input;
4760         }
4761
4762         ir_node *mem = needs_memory ? get_store() : new_NoMem();
4763         assert(obstack_object_size(&asm_obst)
4764                         == in_size * sizeof(ir_asm_constraint));
4765         ir_asm_constraint *input_constraints = obstack_finish(&asm_obst);
4766
4767         /* create asm node */
4768         dbg_info *dbgi = get_dbg_info(&statement->base.pos);
4769
4770         ident *asm_text = new_id_from_str(statement->asm_text.begin);
4771
4772         ir_node *node = new_d_ASM(dbgi, mem, in_size, ins, input_constraints,
4773                                   out_size, output_constraints,
4774                                   n_clobbers, clobbers, asm_text);
4775
4776         if (statement->is_volatile) {
4777                 set_irn_pinned(node, op_pin_state_pinned);
4778         } else {
4779                 set_irn_pinned(node, op_pin_state_floats);
4780         }
4781
4782         /* create output projs & connect them */
4783         if (needs_memory) {
4784                 ir_node *projm = new_Proj(node, mode_M, out_size);
4785                 set_store(projm);
4786         }
4787
4788         size_t i;
4789         for (i = 0; i < out_size; ++i) {
4790                 const expression_t *out_expr = out_exprs[i];
4791                 long                pn       = i;
4792                 ir_mode            *mode     = get_ir_mode_storage(out_expr->base.type);
4793                 ir_node            *proj     = new_Proj(node, mode, pn);
4794                 ir_node            *addr     = out_addrs[i];
4795
4796                 set_value_for_expression_addr(out_expr, proj, addr);
4797         }
4798
4799         return NULL;
4800 }
4801
4802 static ir_node *ms_try_statement_to_firm(ms_try_statement_t *statement)
4803 {
4804         statement_to_firm(statement->try_statement);
4805         position_t const *const pos = &statement->base.pos;
4806         warningf(WARN_OTHER, pos, "structured exception handling ignored");
4807         return NULL;
4808 }
4809
4810 static ir_node *leave_statement_to_firm(leave_statement_t *statement)
4811 {
4812         errorf(&statement->base.pos, "__leave not supported yet");
4813         return NULL;
4814 }
4815
4816 /**
4817  * Transform a statement.
4818  */
4819 static ir_node *statement_to_firm(statement_t *const stmt)
4820 {
4821 #ifndef NDEBUG
4822         assert(!stmt->base.transformed);
4823         stmt->base.transformed = true;
4824 #endif
4825
4826         switch (stmt->kind) {
4827         case STATEMENT_ASM:           return asm_statement_to_firm(        &stmt->asms);
4828         case STATEMENT_CASE_LABEL:    return case_label_to_firm(           &stmt->case_label);
4829         case STATEMENT_COMPOUND:      return compound_statement_to_firm(   &stmt->compound);
4830         case STATEMENT_COMPUTED_GOTO: return computed_goto_to_firm(        &stmt->computed_goto);
4831         case STATEMENT_DECLARATION:   return declaration_statement_to_firm(&stmt->declaration);
4832         case STATEMENT_DO_WHILE:      return do_while_statement_to_firm(   &stmt->do_while);
4833         case STATEMENT_EMPTY:         return NULL; /* nothing */
4834         case STATEMENT_EXPRESSION:    return expression_statement_to_firm( &stmt->expression);
4835         case STATEMENT_FOR:           return for_statement_to_firm(        &stmt->fors);
4836         case STATEMENT_GOTO:          return goto_statement_to_firm(       &stmt->gotos);
4837         case STATEMENT_IF:            return if_statement_to_firm(         &stmt->ifs);
4838         case STATEMENT_LABEL:         return label_to_firm(                &stmt->label);
4839         case STATEMENT_LEAVE:         return leave_statement_to_firm(      &stmt->leave);
4840         case STATEMENT_MS_TRY:        return ms_try_statement_to_firm(     &stmt->ms_try);
4841         case STATEMENT_RETURN:        return return_statement_to_firm(     &stmt->returns);
4842         case STATEMENT_SWITCH:        return switch_statement_to_firm(     &stmt->switchs);
4843
4844         {
4845                 jump_target *tgt;
4846         case STATEMENT_BREAK:    tgt = &break_target;    goto jump;
4847         case STATEMENT_CONTINUE: tgt = &continue_target; goto jump;
4848 jump:
4849                 jump_to_target(tgt);
4850                 set_unreachable_now();
4851                 return NULL;
4852         }
4853
4854         case STATEMENT_ERROR: panic("error statement");
4855         }
4856         panic("statement not implemented");
4857 }
4858
4859 static int count_local_variables(const entity_t *entity,
4860                                  const entity_t *const last)
4861 {
4862         int count = 0;
4863         entity_t const *const end = last != NULL ? last->base.next : NULL;
4864         for (; entity != end; entity = entity->base.next) {
4865                 if ((entity->kind == ENTITY_VARIABLE || entity->kind == ENTITY_PARAMETER) &&
4866                     !var_needs_entity(&entity->variable))
4867                         ++count;
4868         }
4869         return count;
4870 }
4871
4872 static void count_local_variables_in_stmt(statement_t *stmt, void *const env)
4873 {
4874         int *const count = env;
4875
4876         switch (stmt->kind) {
4877         case STATEMENT_DECLARATION: {
4878                 const declaration_statement_t *const decl_stmt = &stmt->declaration;
4879                 *count += count_local_variables(decl_stmt->declarations_begin,
4880                                 decl_stmt->declarations_end);
4881                 break;
4882         }
4883
4884         case STATEMENT_FOR:
4885                 *count += count_local_variables(stmt->fors.scope.entities, NULL);
4886                 break;
4887
4888         default:
4889                 break;
4890         }
4891 }
4892
4893 /**
4894  * Return the number of local (alias free) variables used by a function.
4895  */
4896 static int get_function_n_local_vars(entity_t *entity)
4897 {
4898         const function_t *function = &entity->function;
4899         int count = 0;
4900
4901         /* count parameters */
4902         count += count_local_variables(function->parameters.entities, NULL);
4903
4904         /* count local variables declared in body */
4905         walk_statements(function->body, count_local_variables_in_stmt, &count);
4906         return count;
4907 }
4908
4909 /**
4910  * Build Firm code for the parameters of a function.
4911  */
4912 static void initialize_function_parameters(entity_t *entity)
4913 {
4914         assert(entity->kind == ENTITY_FUNCTION);
4915         ir_graph *irg             = current_ir_graph;
4916         ir_node  *args            = get_irg_args(irg);
4917         int       n               = 0;
4918         ir_type  *function_irtype;
4919
4920         if (entity->function.need_closure) {
4921                 /* add an extra parameter for the static link */
4922                 entity->function.static_link = new_r_Proj(args, mode_P_data, 0);
4923                 ++n;
4924
4925                 /* Matze: IMO this is wrong, nested functions should have an own
4926                  * type and not rely on strange parameters... */
4927                 function_irtype = create_method_type(&entity->declaration.type->function, true);
4928         } else {
4929                 function_irtype = get_ir_type(entity->declaration.type);
4930         }
4931
4932
4933
4934         entity_t *parameter = entity->function.parameters.entities;
4935         for ( ; parameter != NULL; parameter = parameter->base.next, ++n) {
4936                 if (parameter->kind != ENTITY_PARAMETER)
4937                         continue;
4938
4939                 assert(parameter->declaration.kind == DECLARATION_KIND_UNKNOWN);
4940                 type_t *type = skip_typeref(parameter->declaration.type);
4941
4942                 dbg_info *const dbgi         = get_dbg_info(&parameter->base.pos);
4943                 ir_type  *const param_irtype = get_method_param_type(function_irtype, n);
4944                 if (var_needs_entity(&parameter->variable)) {
4945                         ir_type   *frame_type = get_irg_frame_type(irg);
4946                         ir_entity *param
4947                                 = new_d_parameter_entity(frame_type, n, param_irtype, dbgi);
4948                         parameter->declaration.kind  = DECLARATION_KIND_PARAMETER_ENTITY;
4949                         parameter->variable.v.entity = param;
4950                         continue;
4951                 }
4952
4953                 ir_mode *param_mode = get_type_mode(param_irtype);
4954                 long     pn         = n;
4955                 ir_node *value      = new_rd_Proj(dbgi, args, param_mode, pn);
4956                 value = conv_to_storage_type(dbgi, value, type);
4957
4958                 parameter->declaration.kind        = DECLARATION_KIND_PARAMETER;
4959                 parameter->variable.v.value_number = next_value_number_function;
4960                 set_irg_loc_description(current_ir_graph, next_value_number_function,
4961                                         parameter);
4962                 ++next_value_number_function;
4963
4964                 set_value(parameter->variable.v.value_number, value);
4965         }
4966 }
4967
4968 static void add_function_pointer(ir_type *segment, ir_entity *method,
4969                                  const char *unique_template)
4970 {
4971         ir_type   *method_type  = get_entity_type(method);
4972         ir_type   *ptr_type     = new_type_pointer(method_type);
4973
4974         /* these entities don't really have a name but firm only allows
4975          * "" in ld_ident.
4976          * Note that we mustn't give these entities a name since for example
4977          * Mach-O doesn't allow them. */
4978         ident     *ide          = id_unique(unique_template);
4979         ir_entity *ptr          = new_entity(segment, ide, ptr_type);
4980         ir_graph  *irg          = get_const_code_irg();
4981         ir_node   *val          = new_rd_SymConst_addr_ent(NULL, irg, mode_P_code,
4982                                                            method);
4983
4984         set_entity_ld_ident(ptr, new_id_from_chars("", 0));
4985         set_entity_compiler_generated(ptr, 1);
4986         set_entity_visibility(ptr, ir_visibility_private);
4987         add_entity_linkage(ptr, IR_LINKAGE_CONSTANT|IR_LINKAGE_HIDDEN_USER);
4988         set_atomic_ent_value(ptr, val);
4989 }
4990
4991 /**
4992  * Create code for a function and all inner functions.
4993  *
4994  * @param entity  the function entity
4995  */
4996 static void create_function(entity_t *entity)
4997 {
4998         assert(entity->kind == ENTITY_FUNCTION);
4999         ir_entity *function_entity = get_function_entity(entity, current_outer_frame);
5000
5001         if (entity->function.body == NULL)
5002                 return;
5003
5004         inner_functions     = NULL;
5005         current_trampolines = NULL;
5006
5007         if (entity->declaration.modifiers & DM_CONSTRUCTOR) {
5008                 ir_type *segment = get_segment_type(IR_SEGMENT_CONSTRUCTORS);
5009                 add_function_pointer(segment, function_entity, "constructor_ptr.%u");
5010         }
5011         if (entity->declaration.modifiers & DM_DESTRUCTOR) {
5012                 ir_type *segment = get_segment_type(IR_SEGMENT_DESTRUCTORS);
5013                 add_function_pointer(segment, function_entity, "destructor_ptr.%u");
5014         }
5015
5016         current_function_entity = entity;
5017         current_function_name   = NULL;
5018         current_funcsig         = NULL;
5019
5020         assert(!ijmp_ops);
5021         assert(!ijmp_blocks);
5022         init_jump_target(&ijmp_target, NULL);
5023         ijmp_ops    = NEW_ARR_F(ir_node*, 0);
5024         ijmp_blocks = NEW_ARR_F(ir_node*, 0);
5025
5026         int       n_local_vars = get_function_n_local_vars(entity);
5027         ir_graph *irg          = new_ir_graph(function_entity, n_local_vars);
5028         current_ir_graph = irg;
5029
5030         ir_graph *old_current_function = current_function;
5031         current_function = irg;
5032
5033         ir_entity *const old_current_vararg_entity = current_vararg_entity;
5034         current_vararg_entity = NULL;
5035
5036         set_irg_fp_model(irg, firm_fp_model);
5037         set_irn_dbg_info(get_irg_start_block(irg),
5038                          get_entity_dbg_info(function_entity));
5039
5040         next_value_number_function = 0;
5041         initialize_function_parameters(entity);
5042         current_static_link = entity->function.static_link;
5043
5044         statement_to_firm(entity->function.body);
5045
5046         ir_node *end_block = get_irg_end_block(irg);
5047
5048         /* do we have a return statement yet? */
5049         if (currently_reachable()) {
5050                 type_t *type = skip_typeref(entity->declaration.type);
5051                 assert(is_type_function(type));
5052                 type_t *const return_type = skip_typeref(type->function.return_type);
5053
5054                 ir_node *ret;
5055                 if (is_type_void(return_type)) {
5056                         ret = new_Return(get_store(), 0, NULL);
5057                 } else {
5058                         ir_mode *const mode = get_ir_mode_storage(return_type);
5059
5060                         ir_node *in[1];
5061                         /* §5.1.2.2.3 main implicitly returns 0 */
5062                         if (is_main(entity)) {
5063                                 in[0] = new_Const(get_mode_null(mode));
5064                         } else {
5065                                 in[0] = new_Unknown(mode);
5066                         }
5067                         ret = new_Return(get_store(), 1, in);
5068                 }
5069                 add_immBlock_pred(end_block, ret);
5070         }
5071
5072         if (enter_jump_target(&ijmp_target)) {
5073                 keep_loop();
5074                 size_t   const n    = ARR_LEN(ijmp_ops);
5075                 ir_node *const op   = n == 1 ? ijmp_ops[0] : new_Phi(n, ijmp_ops, get_irn_mode(ijmp_ops[0]));
5076                 ir_node *const ijmp = new_IJmp(op);
5077                 for (size_t i = ARR_LEN(ijmp_blocks); i-- != 0;) {
5078                         ir_node *const block = ijmp_blocks[i];
5079                         add_immBlock_pred(block, ijmp);
5080                         mature_immBlock(block);
5081                 }
5082         }
5083
5084         DEL_ARR_F(ijmp_ops);
5085         DEL_ARR_F(ijmp_blocks);
5086         ijmp_ops    = NULL;
5087         ijmp_blocks = NULL;
5088
5089         irg_finalize_cons(irg);
5090
5091         /* finalize the frame type */
5092         ir_type *frame_type = get_irg_frame_type(irg);
5093         int      n          = get_compound_n_members(frame_type);
5094         int      align_all  = 4;
5095         int      offset     = 0;
5096         for (int i = 0; i < n; ++i) {
5097                 ir_entity *member      = get_compound_member(frame_type, i);
5098                 ir_type   *entity_type = get_entity_type(member);
5099
5100                 int align = get_type_alignment_bytes(entity_type);
5101                 if (align > align_all)
5102                         align_all = align;
5103                 int misalign = 0;
5104                 if (align > 0) {
5105                         misalign  = offset % align;
5106                         if (misalign > 0) {
5107                                 offset += align - misalign;
5108                         }
5109                 }
5110
5111                 set_entity_offset(member, offset);
5112                 offset += get_type_size_bytes(entity_type);
5113         }
5114         set_type_size_bytes(frame_type, offset);
5115         set_type_alignment_bytes(frame_type, align_all);
5116
5117         irg_verify(irg, VERIFY_ENFORCE_SSA);
5118         current_vararg_entity = old_current_vararg_entity;
5119         current_function      = old_current_function;
5120
5121         if (current_trampolines != NULL) {
5122                 DEL_ARR_F(current_trampolines);
5123                 current_trampolines = NULL;
5124         }
5125
5126         /* create inner functions if any */
5127         entity_t **inner = inner_functions;
5128         if (inner != NULL) {
5129                 ir_type *rem_outer_frame      = current_outer_frame;
5130                 current_outer_frame           = get_irg_frame_type(current_ir_graph);
5131                 for (int i = ARR_LEN(inner) - 1; i >= 0; --i) {
5132                         create_function(inner[i]);
5133                 }
5134                 DEL_ARR_F(inner);
5135
5136                 current_outer_frame      = rem_outer_frame;
5137         }
5138 }
5139
5140 static void scope_to_firm(scope_t *scope)
5141 {
5142         /* first pass: create declarations */
5143         entity_t *entity = scope->entities;
5144         for ( ; entity != NULL; entity = entity->base.next) {
5145                 if (entity->base.symbol == NULL)
5146                         continue;
5147
5148                 if (entity->kind == ENTITY_FUNCTION) {
5149                         if (entity->function.btk != BUILTIN_NONE) {
5150                                 /* builtins have no representation */
5151                                 continue;
5152                         }
5153                         (void)get_function_entity(entity, NULL);
5154                 } else if (entity->kind == ENTITY_VARIABLE) {
5155                         create_global_variable(entity);
5156                 } else if (entity->kind == ENTITY_NAMESPACE) {
5157                         scope_to_firm(&entity->namespacee.members);
5158                 }
5159         }
5160
5161         /* second pass: create code/initializers */
5162         entity = scope->entities;
5163         for ( ; entity != NULL; entity = entity->base.next) {
5164                 if (entity->base.symbol == NULL)
5165                         continue;
5166
5167                 if (entity->kind == ENTITY_FUNCTION) {
5168                         if (entity->function.btk != BUILTIN_NONE) {
5169                                 /* builtins have no representation */
5170                                 continue;
5171                         }
5172                         create_function(entity);
5173                 } else if (entity->kind == ENTITY_VARIABLE) {
5174                         assert(entity->declaration.kind
5175                                         == DECLARATION_KIND_GLOBAL_VARIABLE);
5176                         current_ir_graph = get_const_code_irg();
5177                         create_variable_initializer(entity);
5178                 }
5179         }
5180 }
5181
5182 void init_ast2firm(void)
5183 {
5184         obstack_init(&asm_obst);
5185         init_atomic_modes();
5186
5187         ir_set_debug_retrieve(dbg_retrieve);
5188         ir_set_type_debug_retrieve(dbg_print_type_dbg_info);
5189
5190         /* create idents for all known runtime functions */
5191         for (size_t i = 0; i < lengthof(rts_data); ++i) {
5192                 rts_idents[i] = new_id_from_str(rts_data[i].name);
5193         }
5194
5195         entitymap_init(&entitymap);
5196 }
5197
5198 static void init_ir_types(void)
5199 {
5200         static int ir_types_initialized = 0;
5201         if (ir_types_initialized)
5202                 return;
5203         ir_types_initialized = 1;
5204
5205         ir_type_char = get_ir_type(type_char);
5206
5207         be_params             = be_get_backend_param();
5208         mode_float_arithmetic = be_params->mode_float_arithmetic;
5209
5210         stack_param_align     = be_params->stack_param_align;
5211 }
5212
5213 void exit_ast2firm(void)
5214 {
5215         entitymap_destroy(&entitymap);
5216         obstack_free(&asm_obst, NULL);
5217 }
5218
5219 static void global_asm_to_firm(statement_t *s)
5220 {
5221         for (; s != NULL; s = s->base.next) {
5222                 assert(s->kind == STATEMENT_ASM);
5223
5224                 char const *const text = s->asms.asm_text.begin;
5225                 size_t      const size = s->asms.asm_text.size;
5226                 ident      *const id   = new_id_from_chars(text, size);
5227                 add_irp_asm(id);
5228         }
5229 }
5230
5231 static const char *get_cwd(void)
5232 {
5233         static char buf[1024];
5234         if (buf[0] == '\0') {
5235                 return getcwd(buf, sizeof(buf));
5236         }
5237         return buf;
5238 }
5239
5240 void translation_unit_to_firm(translation_unit_t *unit)
5241 {
5242         if (c_mode & _CXX) {
5243                 be_dwarf_set_source_language(DW_LANG_C_plus_plus);
5244         } else if (c_mode & _C99) {
5245                 be_dwarf_set_source_language(DW_LANG_C99);
5246         } else if (c_mode & _C89) {
5247                 be_dwarf_set_source_language(DW_LANG_C89);
5248         } else {
5249                 be_dwarf_set_source_language(DW_LANG_C);
5250         }
5251         const char *cwd = get_cwd();
5252         if (cwd != NULL) {
5253                 be_dwarf_set_compilation_directory(cwd);
5254         }
5255
5256         /* initialize firm arithmetic */
5257         tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
5258         ir_set_uninitialized_local_variable_func(uninitialized_local_var);
5259
5260         /* just to be sure */
5261         init_jump_target(&break_target,    NULL);
5262         init_jump_target(&continue_target, NULL);
5263         current_switch           = NULL;
5264         current_translation_unit = unit;
5265
5266         init_ir_types();
5267
5268         scope_to_firm(&unit->scope);
5269         global_asm_to_firm(unit->global_asm);
5270
5271         current_ir_graph         = NULL;
5272         current_translation_unit = NULL;
5273 }