nsz Git - cparser/blob - ast2firm.c

   1 /*
   2  * This file is part of cparser.
   3  * Copyright (C) 2007-2009 Matthias Braun <matze@braunis.de>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  18  * 02111-1307, USA.
  19  */
  20 #include <config.h>
  21
  22 #include <assert.h>
  23 #include <string.h>
  24 #include <stdbool.h>
  25 #include <limits.h>
  26
  27 #include <libfirm/firm.h>
  28 #include <libfirm/adt/obst.h>
  29 #include <libfirm/be.h>
  30
  31 #include "ast2firm.h"
  32
  33 #include "adt/error.h"
  34 #include "adt/array.h"
  35 #include "adt/strutil.h"
  36 #include "adt/util.h"
  37 #include "symbol_t.h"
  38 #include "token_t.h"
  39 #include "type_t.h"
  40 #include "ast_t.h"
  41 #include "entity_t.h"
  42 #include "parser.h"
  43 #include "diagnostic.h"
  44 #include "lang_features.h"
  45 #include "types.h"
  46 #include "type_hash.h"
  47 #include "mangle.h"
  48 #include "walk.h"
  49 #include "warning.h"
  50 #include "printer.h"
  51 #include "entitymap_t.h"
  52 #include "driver/firm_opt.h"
  53
  54 typedef struct trampoline_region trampoline_region;
  55 struct trampoline_region {
  56         ir_entity        *function;    /**< The function that is called by this trampoline */
  57         ir_entity        *region;      /**< created region for the trampoline */
  58 };
  59
  60 fp_model_t firm_fp_model = fp_model_precise;
  61
  62 static const backend_params *be_params;
  63
  64 static ir_type *ir_type_char;
  65 static ir_type *ir_type_const_char;
  66 static ir_type *ir_type_wchar_t;
  67 static ir_type *ir_type_void;
  68 static ir_type *ir_type_int;
  69
  70 /* architecture specific floating point arithmetic mode (if any) */
  71 static ir_mode *mode_float_arithmetic;
  72
  73 /* alignment of stack parameters */
  74 static unsigned stack_param_align;
  75
  76 static int        next_value_number_function;
  77 static ir_node   *continue_label;
  78 static ir_node   *break_label;
  79 static ir_node   *current_switch_cond;
  80 static bool       saw_default_label;
  81 static label_t  **all_labels;
  82 static entity_t **inner_functions;
  83 static ir_node   *ijmp_list;
  84 static bool       constant_folding;
  85
  86 static const entity_t     *current_function_entity;
  87 static ir_node            *current_function_name;
  88 static ir_node            *current_funcsig;
  89 static switch_statement_t *current_switch;
  90 static ir_graph           *current_function;
  91 static translation_unit_t *current_translation_unit;
  92 static trampoline_region  *current_trampolines;
  93 static ir_type            *current_outer_frame;
  94 static ir_node            *current_static_link;
  95 static ir_entity          *current_vararg_entity;
  96
  97 static entitymap_t  entitymap;
  98
  99 static struct obstack asm_obst;
 100
 101 typedef enum declaration_kind_t {
 102         DECLARATION_KIND_UNKNOWN,
 103         DECLARATION_KIND_VARIABLE_LENGTH_ARRAY,
 104         DECLARATION_KIND_GLOBAL_VARIABLE,
 105         DECLARATION_KIND_LOCAL_VARIABLE,
 106         DECLARATION_KIND_LOCAL_VARIABLE_ENTITY,
 107         DECLARATION_KIND_PARAMETER,
 108         DECLARATION_KIND_PARAMETER_ENTITY,
 109         DECLARATION_KIND_FUNCTION,
 110         DECLARATION_KIND_COMPOUND_MEMBER,
 111         DECLARATION_KIND_INNER_FUNCTION
 112 } declaration_kind_t;
 113
 114 static ir_mode *get_ir_mode_storage(type_t *type);
 115
 116 static ir_type *get_ir_type_incomplete(type_t *type);
 117
 118 static void enqueue_inner_function(entity_t *entity)
 119 {
 120         if (inner_functions == NULL)
 121                 inner_functions = NEW_ARR_F(entity_t *, 0);
 122         ARR_APP1(entity_t*, inner_functions, entity);
 123 }
 124
 125 static ir_node *uninitialized_local_var(ir_graph *irg, ir_mode *mode, int pos)
 126 {
 127         const entity_t *entity = get_irg_loc_description(irg, pos);
 128
 129         if (entity != NULL) {
 130                 source_position_t const *const pos = &entity->base.source_position;
 131                 warningf(WARN_UNINITIALIZED, pos, "'%N' might be used uninitialized", entity);
 132         }
 133         return new_r_Unknown(irg, mode);
 134 }
 135
 136 static const char *dbg_retrieve(const dbg_info *dbg, unsigned *line)
 137 {
 138         const source_position_t *pos = (const source_position_t*) dbg;
 139         if (pos == NULL)
 140                 return NULL;
 141         if (line != NULL)
 142                 *line = pos->lineno;
 143         return pos->input_name;
 144 }
 145
 146 static dbg_info *get_dbg_info(const source_position_t *pos)
 147 {
 148         return (dbg_info*) pos;
 149 }
 150
 151 static void dbg_print_type_dbg_info(char *buffer, size_t buffer_size,
 152                                     const type_dbg_info *dbg)
 153 {
 154         assert(dbg != NULL);
 155         print_to_buffer(buffer, buffer_size);
 156         const type_t *type = (const type_t*) dbg;
 157         print_type(type);
 158         finish_print_to_buffer();
 159 }
 160
 161 static type_dbg_info *get_type_dbg_info_(const type_t *type)
 162 {
 163         return (type_dbg_info*) type;
 164 }
 165
 166 /* is the current block a reachable one? */
 167 static bool currently_reachable(void)
 168 {
 169         ir_node *const block = get_cur_block();
 170         return block != NULL && !is_Bad(block);
 171 }
 172
 173 static void set_unreachable_now(void)
 174 {
 175         set_cur_block(NULL);
 176 }
 177
 178 static ir_mode *atomic_modes[ATOMIC_TYPE_LAST+1];
 179
 180 static ir_mode *mode_int, *mode_uint;
 181
 182 static ir_node *_expression_to_firm(const expression_t *expression);
 183 static ir_node *expression_to_firm(const expression_t *expression);
 184 static void create_local_declaration(entity_t *entity);
 185
 186 static unsigned decide_modulo_shift(unsigned type_size)
 187 {
 188         if (architecture_modulo_shift == 0)
 189                 return 0;
 190         if (type_size < architecture_modulo_shift)
 191                 return architecture_modulo_shift;
 192         return type_size;
 193 }
 194
 195 static ir_mode *init_atomic_ir_mode(atomic_type_kind_t kind)
 196 {
 197         unsigned flags = get_atomic_type_flags(kind);
 198         unsigned size  = get_atomic_type_size(kind);
 199         if ( (flags & (ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_FLOAT))
 200                         && !(flags & ATOMIC_TYPE_FLAG_COMPLEX)) {
 201                 char            name[64];
 202                 ir_mode_sort    sort;
 203                 unsigned        bit_size     = size * 8;
 204                 bool            is_signed    = (flags & ATOMIC_TYPE_FLAG_SIGNED) != 0;
 205                 unsigned        modulo_shift = 0;
 206                 ir_mode_arithmetic arithmetic;
 207
 208                 if (flags & ATOMIC_TYPE_FLAG_INTEGER) {
 209                         assert(! (flags & ATOMIC_TYPE_FLAG_FLOAT));
 210                         snprintf(name, sizeof(name), "%s%u", is_signed ? "I" : "U",
 211                                  bit_size);
 212                         sort         = irms_int_number;
 213                         arithmetic   = irma_twos_complement;
 214                         modulo_shift = decide_modulo_shift(bit_size);
 215                 } else {
 216                         assert(flags & ATOMIC_TYPE_FLAG_FLOAT);
 217                         snprintf(name, sizeof(name), "F%u", bit_size);
 218                         sort         = irms_float_number;
 219                         arithmetic   = irma_ieee754;
 220                 }
 221                 return new_ir_mode(name, sort, bit_size, is_signed, arithmetic,
 222                                    modulo_shift);
 223         }
 224
 225         return NULL;
 226 }
 227
 228 /**
 229  * Initialises the atomic modes depending on the machine size.
 230  */
 231 static void init_atomic_modes(void)
 232 {
 233         for (int i = 0; i <= ATOMIC_TYPE_LAST; ++i) {
 234                 atomic_modes[i] = init_atomic_ir_mode((atomic_type_kind_t) i);
 235         }
 236         mode_int  = atomic_modes[ATOMIC_TYPE_INT];
 237         mode_uint = atomic_modes[ATOMIC_TYPE_UINT];
 238
 239         /* there's no real void type in firm */
 240         atomic_modes[ATOMIC_TYPE_VOID] = atomic_modes[ATOMIC_TYPE_CHAR];
 241 }
 242
 243 ir_mode *get_atomic_mode(atomic_type_kind_t kind)
 244 {
 245         assert(kind <= ATOMIC_TYPE_LAST);
 246         return atomic_modes[kind];
 247 }
 248
 249 static ir_node *get_vla_size(array_type_t *const type)
 250 {
 251         ir_node *size_node = type->size_node;
 252         if (size_node == NULL) {
 253                 size_node = expression_to_firm(type->size_expression);
 254                 type->size_node = size_node;
 255         }
 256         return size_node;
 257 }
 258
 259 /**
 260  * Return a node representing the size of a type.
 261  */
 262 static ir_node *get_type_size_node(type_t *type)
 263 {
 264         type = skip_typeref(type);
 265
 266         if (is_type_array(type) && type->array.is_vla) {
 267                 ir_node *size_node = get_vla_size(&type->array);
 268                 ir_node *elem_size = get_type_size_node(type->array.element_type);
 269                 ir_mode *mode      = get_irn_mode(size_node);
 270                 ir_node *real_size = new_d_Mul(NULL, size_node, elem_size, mode);
 271                 return real_size;
 272         }
 273
 274         ir_mode *mode = get_ir_mode_storage(type_size_t);
 275         symconst_symbol sym;
 276         sym.type_p = get_ir_type(type);
 277         return new_SymConst(mode, sym, symconst_type_size);
 278 }
 279
 280 static unsigned count_parameters(const function_type_t *function_type)
 281 {
 282         unsigned count = 0;
 283
 284         function_parameter_t *parameter = function_type->parameters;
 285         for ( ; parameter != NULL; parameter = parameter->next) {
 286                 ++count;
 287         }
 288
 289         return count;
 290 }
 291
 292 /**
 293  * Creates a Firm type for an atomic type
 294  */
 295 static ir_type *create_atomic_type(atomic_type_kind_t akind, const type_t *type)
 296 {
 297         ir_mode        *mode      = atomic_modes[akind];
 298         type_dbg_info  *dbgi      = get_type_dbg_info_(type);
 299         ir_type        *irtype    = new_d_type_primitive(mode, dbgi);
 300         il_alignment_t  alignment = get_atomic_type_alignment(akind);
 301
 302         set_type_alignment_bytes(irtype, alignment);
 303
 304         return irtype;
 305 }
 306
 307 /**
 308  * Creates a Firm type for a complex type
 309  */
 310 static ir_type *create_complex_type(const atomic_type_t *type)
 311 {
 312         atomic_type_kind_t  kind = type->akind;
 313         ir_mode            *mode = atomic_modes[kind];
 314         ident              *id   = get_mode_ident(mode);
 315
 316         (void) id;
 317
 318         /* FIXME: finish the array */
 319         return NULL;
 320 }
 321
 322 /**
 323  * Creates a Firm type for an imaginary type
 324  */
 325 static ir_type *create_imaginary_type(const atomic_type_t *type)
 326 {
 327         return create_atomic_type(type->akind, (const type_t*)type);
 328 }
 329
 330 /**
 331  * return type of a parameter (and take transparent union gnu extension into
 332  * account)
 333  */
 334 static type_t *get_parameter_type(type_t *orig_type)
 335 {
 336         type_t *type = skip_typeref(orig_type);
 337         if (is_type_union(type)
 338                         && get_type_modifiers(orig_type) & DM_TRANSPARENT_UNION) {
 339                 compound_t *compound = type->compound.compound;
 340                 type                 = compound->members.entities->declaration.type;
 341         }
 342
 343         return type;
 344 }
 345
 346 static ir_type *create_method_type(const function_type_t *function_type, bool for_closure)
 347 {
 348         type_t        *return_type  = skip_typeref(function_type->return_type);
 349
 350         int            n_parameters = count_parameters(function_type)
 351                                        + (for_closure ? 1 : 0);
 352         int            n_results    = return_type == type_void ? 0 : 1;
 353         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) function_type);
 354         ir_type       *irtype       = new_d_type_method(n_parameters, n_results, dbgi);
 355
 356         if (return_type != type_void) {
 357                 ir_type *restype = get_ir_type(return_type);
 358                 set_method_res_type(irtype, 0, restype);
 359         }
 360
 361         function_parameter_t *parameter = function_type->parameters;
 362         int                   n         = 0;
 363         if (for_closure) {
 364                 ir_type *p_irtype = get_ir_type(type_void_ptr);
 365                 set_method_param_type(irtype, n, p_irtype);
 366                 ++n;
 367         }
 368         for ( ; parameter != NULL; parameter = parameter->next) {
 369                 type_t  *type     = get_parameter_type(parameter->type);
 370                 ir_type *p_irtype = get_ir_type(type);
 371                 set_method_param_type(irtype, n, p_irtype);
 372                 ++n;
 373         }
 374
 375         bool is_variadic = function_type->variadic;
 376
 377         if (is_variadic)
 378                 set_method_variadicity(irtype, variadicity_variadic);
 379
 380         unsigned cc = get_method_calling_convention(irtype);
 381         switch (function_type->calling_convention) {
 382         case CC_DEFAULT: /* unspecified calling convention, equal to one of the other, typically cdecl */
 383         case CC_CDECL:
 384 is_cdecl:
 385                 set_method_calling_convention(irtype, SET_CDECL(cc));
 386                 break;
 387
 388         case CC_STDCALL:
 389                 if (is_variadic)
 390                         goto is_cdecl;
 391
 392                 /* only non-variadic function can use stdcall, else use cdecl */
 393                 set_method_calling_convention(irtype, SET_STDCALL(cc));
 394                 break;
 395
 396         case CC_FASTCALL:
 397                 if (is_variadic)
 398                         goto is_cdecl;
 399                 /* only non-variadic function can use fastcall, else use cdecl */
 400                 set_method_calling_convention(irtype, SET_FASTCALL(cc));
 401                 break;
 402
 403         case CC_THISCALL:
 404                 /* Hmm, leave default, not accepted by the parser yet. */
 405                 break;
 406         }
 407
 408         if (for_closure)
 409                 set_method_calling_convention(irtype, get_method_calling_convention(irtype) | cc_this_call);
 410
 411         const decl_modifiers_t modifiers = function_type->modifiers;
 412         if (modifiers & DM_CONST)
 413                 add_method_additional_properties(irtype, mtp_property_const);
 414         if (modifiers & DM_PURE)
 415                 add_method_additional_properties(irtype, mtp_property_pure);
 416         if (modifiers & DM_RETURNS_TWICE)
 417                 add_method_additional_properties(irtype, mtp_property_returns_twice);
 418         if (modifiers & DM_NORETURN)
 419                 add_method_additional_properties(irtype, mtp_property_noreturn);
 420         if (modifiers & DM_NOTHROW)
 421                 add_method_additional_properties(irtype, mtp_property_nothrow);
 422         if (modifiers & DM_MALLOC)
 423                 add_method_additional_properties(irtype, mtp_property_malloc);
 424
 425         return irtype;
 426 }
 427
 428 static ir_type *create_pointer_type(pointer_type_t *type)
 429 {
 430         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) type);
 431         type_t        *points_to    = type->points_to;
 432         ir_type       *ir_points_to = get_ir_type_incomplete(points_to);
 433         ir_type       *irtype       = new_d_type_pointer(ir_points_to, dbgi);
 434
 435         return irtype;
 436 }
 437
 438 static ir_type *create_reference_type(reference_type_t *type)
 439 {
 440         type_dbg_info *dbgi         = get_type_dbg_info_((const type_t*) type);
 441         type_t        *refers_to    = type->refers_to;
 442         ir_type       *ir_refers_to = get_ir_type_incomplete(refers_to);
 443         ir_type       *irtype       = new_d_type_pointer(ir_refers_to, dbgi);
 444
 445         return irtype;
 446 }
 447
 448 static ir_type *create_array_type(array_type_t *type)
 449 {
 450         type_dbg_info *dbgi            = get_type_dbg_info_((const type_t*) type);
 451         type_t        *element_type    = type->element_type;
 452         ir_type       *ir_element_type = get_ir_type(element_type);
 453         ir_type       *irtype          = new_d_type_array(1, ir_element_type, dbgi);
 454
 455         const int align = get_type_alignment_bytes(ir_element_type);
 456         set_type_alignment_bytes(irtype, align);
 457
 458         if (type->size_constant) {
 459                 int n_elements = type->size;
 460
 461                 set_array_bounds_int(irtype, 0, 0, n_elements);
 462
 463                 size_t elemsize = get_type_size_bytes(ir_element_type);
 464                 if (elemsize % align > 0) {
 465                         elemsize += align - (elemsize % align);
 466                 }
 467                 set_type_size_bytes(irtype, n_elements * elemsize);
 468         } else {
 469                 set_array_lower_bound_int(irtype, 0, 0);
 470         }
 471         set_type_state(irtype, layout_fixed);
 472
 473         return irtype;
 474 }
 475
 476 /**
 477  * Return the signed integer type of size bits.
 478  *
 479  * @param size   the size
 480  */
 481 static ir_type *get_signed_int_type_for_bit_size(ir_type *base_tp,
 482                                                  unsigned size,
 483                                                                                                  const type_t *type)
 484 {
 485         static ir_mode *s_modes[64 + 1] = {NULL, };
 486         ir_type *res;
 487         ir_mode *mode;
 488
 489         if (size <= 0 || size > 64)
 490                 return NULL;
 491
 492         mode = s_modes[size];
 493         if (mode == NULL) {
 494                 char name[32];
 495
 496                 snprintf(name, sizeof(name), "bf_I%u", size);
 497                 mode = new_ir_mode(name, irms_int_number, size, 1, irma_twos_complement,
 498                                    size <= 32 ? 32 : size );
 499                 s_modes[size] = mode;
 500         }
 501
 502         type_dbg_info *dbgi = get_type_dbg_info_(type);
 503         res                 = new_d_type_primitive(mode, dbgi);
 504         set_primitive_base_type(res, base_tp);
 505
 506         return res;
 507 }
 508
 509 /**
 510  * Return the unsigned integer type of size bits.
 511  *
 512  * @param size   the size
 513  */
 514 static ir_type *get_unsigned_int_type_for_bit_size(ir_type *base_tp,
 515                                                    unsigned size,
 516                                                                                                    const type_t *type)
 517 {
 518         static ir_mode *u_modes[64 + 1] = {NULL, };
 519         ir_type *res;
 520         ir_mode *mode;
 521
 522         if (size <= 0 || size > 64)
 523                 return NULL;
 524
 525         mode = u_modes[size];
 526         if (mode == NULL) {
 527                 char name[32];
 528
 529                 snprintf(name, sizeof(name), "bf_U%u", size);
 530                 mode = new_ir_mode(name, irms_int_number, size, 0, irma_twos_complement,
 531                                    size <= 32 ? 32 : size );
 532                 u_modes[size] = mode;
 533         }
 534
 535         type_dbg_info *dbgi = get_type_dbg_info_(type);
 536         res = new_d_type_primitive(mode, dbgi);
 537         set_primitive_base_type(res, base_tp);
 538
 539         return res;
 540 }
 541
 542 static ir_type *create_bitfield_type(const entity_t *entity)
 543 {
 544         assert(entity->kind == ENTITY_COMPOUND_MEMBER);
 545         type_t *base = skip_typeref(entity->declaration.type);
 546         assert(base->kind == TYPE_ATOMIC || base->kind == TYPE_ENUM);
 547         ir_type *irbase = get_ir_type(base);
 548
 549         unsigned bit_size = entity->compound_member.bit_size;
 550
 551         assert(!is_type_float(base));
 552         if (is_type_signed(base)) {
 553                 return get_signed_int_type_for_bit_size(irbase, bit_size, base);
 554         } else {
 555                 return get_unsigned_int_type_for_bit_size(irbase, bit_size, base);
 556         }
 557 }
 558
 559 #define INVALID_TYPE ((ir_type_ptr)-1)
 560
 561 enum {
 562         COMPOUND_IS_STRUCT = false,
 563         COMPOUND_IS_UNION  = true
 564 };
 565
 566 /**
 567  * Construct firm type from ast struct type.
 568  */
 569 static ir_type *create_compound_type(compound_type_t *type,
 570                                      bool incomplete, bool is_union)
 571 {
 572         compound_t *compound = type->compound;
 573
 574         if (compound->irtype != NULL && (compound->irtype_complete || incomplete)) {
 575                 return compound->irtype;
 576         }
 577
 578         symbol_t *type_symbol = compound->base.symbol;
 579         ident    *id;
 580         if (type_symbol != NULL) {
 581                 id = new_id_from_str(type_symbol->string);
 582         } else {
 583                 if (is_union) {
 584                         id = id_unique("__anonymous_union.%u");
 585                 } else {
 586                         id = id_unique("__anonymous_struct.%u");
 587                 }
 588         }
 589
 590         ir_type *irtype;
 591         if (is_union) {
 592                 irtype = new_type_union(id);
 593         } else {
 594                 irtype = new_type_struct(id);
 595         }
 596
 597         compound->irtype_complete = false;
 598         compound->irtype          = irtype;
 599
 600         if (incomplete)
 601                 return irtype;
 602
 603         if (is_union) {
 604                 layout_union_type(type);
 605         } else {
 606                 layout_struct_type(type);
 607         }
 608
 609         compound->irtype_complete = true;
 610
 611         entity_t *entry = compound->members.entities;
 612         for ( ; entry != NULL; entry = entry->base.next) {
 613                 if (entry->kind != ENTITY_COMPOUND_MEMBER)
 614                         continue;
 615
 616                 symbol_t *symbol     = entry->base.symbol;
 617                 type_t   *entry_type = entry->declaration.type;
 618                 ident    *ident;
 619                 if (symbol == NULL) {
 620                         /* anonymous bitfield member, skip */
 621                         if (entry->compound_member.bitfield)
 622                                 continue;
 623                         assert(entry_type->kind == TYPE_COMPOUND_STRUCT
 624                                         || entry_type->kind == TYPE_COMPOUND_UNION);
 625                         ident = id_unique("anon.%u");
 626                 } else {
 627                         ident = new_id_from_str(symbol->string);
 628                 }
 629
 630                 dbg_info *dbgi       = get_dbg_info(&entry->base.source_position);
 631
 632                 ir_type *entry_irtype;
 633                 if (entry->compound_member.bitfield) {
 634                         entry_irtype = create_bitfield_type(entry);
 635                 } else {
 636                         entry_irtype = get_ir_type(entry_type);
 637                 }
 638                 ir_entity *entity = new_d_entity(irtype, ident, entry_irtype, dbgi);
 639
 640                 set_entity_offset(entity, entry->compound_member.offset);
 641                 set_entity_offset_bits_remainder(entity,
 642                                                  entry->compound_member.bit_offset);
 643
 644                 assert(entry->declaration.kind == DECLARATION_KIND_UNKNOWN);
 645                 entry->declaration.kind       = DECLARATION_KIND_COMPOUND_MEMBER;
 646                 entry->compound_member.entity = entity;
 647         }
 648
 649         set_type_alignment_bytes(irtype, compound->alignment);
 650         set_type_size_bytes(irtype, compound->size);
 651         set_type_state(irtype, layout_fixed);
 652
 653         return irtype;
 654 }
 655
 656 static void determine_enum_values(enum_type_t *const type)
 657 {
 658         ir_mode   *const mode    = atomic_modes[type->base.akind];
 659         ir_tarval *const one     = get_mode_one(mode);
 660         ir_tarval *      tv_next = get_mode_null(mode);
 661
 662         bool constant_folding_old = constant_folding;
 663         constant_folding = true;
 664
 665         enum_t   *enume = type->enume;
 666         entity_t *entry = enume->base.next;
 667         for (; entry != NULL; entry = entry->base.next) {
 668                 if (entry->kind != ENTITY_ENUM_VALUE)
 669                         break;
 670
 671                 expression_t *const init = entry->enum_value.value;
 672                 if (init != NULL) {
 673                         ir_node *const cnst = expression_to_firm(init);
 674                         if (!is_Const(cnst)) {
 675                                 panic("couldn't fold constant");
 676                         }
 677                         tv_next = get_Const_tarval(cnst);
 678                 }
 679                 assert(entry->enum_value.tv == NULL || entry->enum_value.tv == tv_next);
 680                 entry->enum_value.tv = tv_next;
 681                 tv_next = tarval_add(tv_next, one);
 682         }
 683
 684         constant_folding = constant_folding_old;
 685 }
 686
 687 static ir_type *create_enum_type(enum_type_t *const type)
 688 {
 689         return create_atomic_type(type->base.akind, (const type_t*) type);
 690 }
 691
 692 static ir_type *get_ir_type_incomplete(type_t *type)
 693 {
 694         assert(type != NULL);
 695         type = skip_typeref(type);
 696
 697         if (type->base.firm_type != NULL) {
 698                 assert(type->base.firm_type != INVALID_TYPE);
 699                 return type->base.firm_type;
 700         }
 701
 702         switch (type->kind) {
 703         case TYPE_COMPOUND_STRUCT:
 704                 return create_compound_type(&type->compound, true, COMPOUND_IS_STRUCT);
 705         case TYPE_COMPOUND_UNION:
 706                 return create_compound_type(&type->compound, true, COMPOUND_IS_UNION);
 707         default:
 708                 return get_ir_type(type);
 709         }
 710 }
 711
 712 ir_type *get_ir_type(type_t *type)
 713 {
 714         assert(type != NULL);
 715
 716         type = skip_typeref(type);
 717
 718         if (type->base.firm_type != NULL) {
 719                 assert(type->base.firm_type != INVALID_TYPE);
 720                 return type->base.firm_type;
 721         }
 722
 723         ir_type *firm_type = NULL;
 724         switch (type->kind) {
 725         case TYPE_ERROR:
 726                 /* Happens while constant folding, when there was an error */
 727                 return create_atomic_type(ATOMIC_TYPE_VOID, NULL);
 728
 729         case TYPE_ATOMIC:
 730                 firm_type = create_atomic_type(type->atomic.akind, type);
 731                 break;
 732         case TYPE_COMPLEX:
 733                 firm_type = create_complex_type(&type->atomic);
 734                 break;
 735         case TYPE_IMAGINARY:
 736                 firm_type = create_imaginary_type(&type->atomic);
 737                 break;
 738         case TYPE_FUNCTION:
 739                 firm_type = create_method_type(&type->function, false);
 740                 break;
 741         case TYPE_POINTER:
 742                 firm_type = create_pointer_type(&type->pointer);
 743                 break;
 744         case TYPE_REFERENCE:
 745                 firm_type = create_reference_type(&type->reference);
 746                 break;
 747         case TYPE_ARRAY:
 748                 firm_type = create_array_type(&type->array);
 749                 break;
 750         case TYPE_COMPOUND_STRUCT:
 751                 firm_type = create_compound_type(&type->compound, false, COMPOUND_IS_STRUCT);
 752                 break;
 753         case TYPE_COMPOUND_UNION:
 754                 firm_type = create_compound_type(&type->compound, false, COMPOUND_IS_UNION);
 755                 break;
 756         case TYPE_ENUM:
 757                 firm_type = create_enum_type(&type->enumt);
 758                 break;
 759
 760         case TYPE_TYPEOF:
 761         case TYPE_TYPEDEF:
 762                 break;
 763         }
 764         if (firm_type == NULL)
 765                 panic("unknown type found");
 766
 767         type->base.firm_type = firm_type;
 768         return firm_type;
 769 }
 770
 771 static ir_mode *get_ir_mode_storage(type_t *type)
 772 {
 773         ir_type *irtype = get_ir_type(type);
 774
 775         /* firm doesn't report a mode for arrays somehow... */
 776         if (is_Array_type(irtype)) {
 777                 return mode_P_data;
 778         }
 779
 780         ir_mode *mode = get_type_mode(irtype);
 781         assert(mode != NULL);
 782         return mode;
 783 }
 784
 785 /*
 786  * get arithmetic mode for a type. This is different from get_ir_mode_storage,
 787  * int that it returns bigger modes for floating point on some platforms
 788  * (x87 internally does arithemtic with 80bits)
 789  */
 790 static ir_mode *get_ir_mode_arithmetic(type_t *type)
 791 {
 792         ir_mode *mode = get_ir_mode_storage(type);
 793         if (mode_is_float(mode) && mode_float_arithmetic != NULL) {
 794                 return mode_float_arithmetic;
 795         }
 796
 797         return mode;
 798 }
 799
 800 /** Names of the runtime functions. */
 801 static const struct {
 802         int        id;           /**< the rts id */
 803         int        n_res;        /**< number of return values */
 804         const char *name;        /**< the name of the rts function */
 805         int        n_params;     /**< number of parameters */
 806         unsigned   flags;        /**< language flags */
 807 } rts_data[] = {
 808         { rts_debugbreak, 0, "__debugbreak", 0, _MS },
 809         { rts_abort,      0, "abort",        0, _C89 },
 810         { rts_alloca,     1, "alloca",       1, _ALL },
 811         { rts_abs,        1, "abs",          1, _C89 },
 812         { rts_labs,       1, "labs",         1, _C89 },
 813         { rts_llabs,      1, "llabs",        1, _C99 },
 814         { rts_imaxabs,    1, "imaxabs",      1, _C99 },
 815
 816         { rts_fabs,       1, "fabs",         1, _C89 },
 817         { rts_sqrt,       1, "sqrt",         1, _C89 },
 818         { rts_cbrt,       1, "cbrt",         1, _C99 },
 819         { rts_exp,        1, "exp",          1, _C89 },
 820         { rts_exp2,       1, "exp2",         1, _C89 },
 821         { rts_exp10,      1, "exp10",        1, _GNUC },
 822         { rts_log,        1, "log",          1, _C89 },
 823         { rts_log2,       1, "log2",         1, _C89 },
 824         { rts_log10,      1, "log10",        1, _C89 },
 825         { rts_pow,        1, "pow",          2, _C89 },
 826         { rts_sin,        1, "sin",          1, _C89 },
 827         { rts_cos,        1, "cos",          1, _C89 },
 828         { rts_tan,        1, "tan",          1, _C89 },
 829         { rts_asin,       1, "asin",         1, _C89 },
 830         { rts_acos,       1, "acos",         1, _C89 },
 831         { rts_atan,       1, "atan",         1, _C89 },
 832         { rts_sinh,       1, "sinh",         1, _C89 },
 833         { rts_cosh,       1, "cosh",         1, _C89 },
 834         { rts_tanh,       1, "tanh",         1, _C89 },
 835
 836         { rts_fabsf,      1, "fabsf",        1, _C99 },
 837         { rts_sqrtf,      1, "sqrtf",        1, _C99 },
 838         { rts_cbrtf,      1, "cbrtf",        1, _C99 },
 839         { rts_expf,       1, "expf",         1, _C99 },
 840         { rts_exp2f,      1, "exp2f",        1, _C99 },
 841         { rts_exp10f,     1, "exp10f",       1, _GNUC },
 842         { rts_logf,       1, "logf",         1, _C99 },
 843         { rts_log2f,      1, "log2f",        1, _C99 },
 844         { rts_log10f,     1, "log10f",       1, _C99 },
 845         { rts_powf,       1, "powf",         2, _C99 },
 846         { rts_sinf,       1, "sinf",         1, _C99 },
 847         { rts_cosf,       1, "cosf",         1, _C99 },
 848         { rts_tanf,       1, "tanf",         1, _C99 },
 849         { rts_asinf,      1, "asinf",        1, _C99 },
 850         { rts_acosf,      1, "acosf",        1, _C99 },
 851         { rts_atanf,      1, "atanf",        1, _C99 },
 852         { rts_sinhf,      1, "sinhf",        1, _C99 },
 853         { rts_coshf,      1, "coshf",        1, _C99 },
 854         { rts_tanhf,      1, "tanhf",        1, _C99 },
 855
 856         { rts_fabsl,      1, "fabsl",        1, _C99 },
 857         { rts_sqrtl,      1, "sqrtl",        1, _C99 },
 858         { rts_cbrtl,      1, "cbrtl",        1, _C99 },
 859         { rts_expl,       1, "expl",         1, _C99 },
 860         { rts_exp2l,      1, "exp2l",        1, _C99 },
 861         { rts_exp10l,     1, "exp10l",       1, _GNUC },
 862         { rts_logl,       1, "logl",         1, _C99 },
 863         { rts_log2l,      1, "log2l",        1, _C99 },
 864         { rts_log10l,     1, "log10l",       1, _C99 },
 865         { rts_powl,       1, "powl",         2, _C99 },
 866         { rts_sinl,       1, "sinl",         1, _C99 },
 867         { rts_cosl,       1, "cosl",         1, _C99 },
 868         { rts_tanl,       1, "tanl",         1, _C99 },
 869         { rts_asinl,      1, "asinl",        1, _C99 },
 870         { rts_acosl,      1, "acosl",        1, _C99 },
 871         { rts_atanl,      1, "atanl",        1, _C99 },
 872         { rts_sinhl,      1, "sinhl",        1, _C99 },
 873         { rts_coshl,      1, "coshl",        1, _C99 },
 874         { rts_tanhl,      1, "tanhl",        1, _C99 },
 875
 876         { rts_strcmp,     1, "strcmp",       2, _C89 },
 877         { rts_strncmp,    1, "strncmp",      3, _C89 },
 878         { rts_strcpy,     1, "strcpy",       2, _C89 },
 879         { rts_strlen,     1, "strlen",       1, _C89 },
 880         { rts_memcpy,     1, "memcpy",       3, _C89 },
 881         { rts_mempcpy,    1, "mempcpy",      3, _GNUC },
 882         { rts_memmove,    1, "memmove",      3, _C89 },
 883         { rts_memset,     1, "memset",       3, _C89 },
 884         { rts_memcmp,     1, "memcmp",       3, _C89 },
 885 };
 886
 887 static ident *rts_idents[lengthof(rts_data)];
 888
 889 static create_ld_ident_func create_ld_ident = create_name_linux_elf;
 890
 891 void set_create_ld_ident(ident *(*func)(entity_t*))
 892 {
 893         create_ld_ident = func;
 894 }
 895
 896 /**
 897  * Handle GNU attributes for entities
 898  *
 899  * @param ent   the entity
 900  * @param decl  the routine declaration
 901  */
 902 static void handle_decl_modifiers(ir_entity *irentity, entity_t *entity)
 903 {
 904         assert(is_declaration(entity));
 905         decl_modifiers_t modifiers = entity->declaration.modifiers;
 906
 907         if (is_method_entity(irentity)) {
 908                 if (modifiers & DM_PURE) {
 909                         set_entity_additional_properties(irentity, mtp_property_pure);
 910                 }
 911                 if (modifiers & DM_CONST) {
 912                         add_entity_additional_properties(irentity, mtp_property_const);
 913                 }
 914         }
 915         if (modifiers & DM_USED) {
 916                 add_entity_linkage(irentity, IR_LINKAGE_HIDDEN_USER);
 917         }
 918         if (modifiers & DM_WEAK) {
 919                 add_entity_linkage(irentity, IR_LINKAGE_WEAK);
 920         }
 921 }
 922
 923 static bool is_main(entity_t *entity)
 924 {
 925         static symbol_t *sym_main = NULL;
 926         if (sym_main == NULL) {
 927                 sym_main = symbol_table_insert("main");
 928         }
 929
 930         if (entity->base.symbol != sym_main)
 931                 return false;
 932         /* must be in outermost scope */
 933         if (entity->base.parent_scope != &current_translation_unit->scope)
 934                 return false;
 935
 936         return true;
 937 }
 938
 939 /**
 940  * Creates an entity representing a function.
 941  *
 942  * @param entity       the function declaration/definition
 943  * @param owner_type   the owner type of this function, NULL
 944  *                     for global functions
 945  */
 946 static ir_entity *get_function_entity(entity_t *entity, ir_type *owner_type)
 947 {
 948         assert(entity->kind == ENTITY_FUNCTION);
 949         if (entity->function.irentity != NULL)
 950                 return entity->function.irentity;
 951
 952         switch (entity->function.btk) {
 953         case BUILTIN_NONE:
 954         case BUILTIN_LIBC:
 955         case BUILTIN_LIBC_CHECK:
 956                 break;
 957         default:
 958                 return NULL;
 959         }
 960
 961         if (is_main(entity)) {
 962                 /* force main to C linkage */
 963                 type_t *type = entity->declaration.type;
 964                 assert(is_type_function(type));
 965                 if (type->function.linkage != LINKAGE_C) {
 966                         type_t *new_type           = duplicate_type(type);
 967                         new_type->function.linkage = LINKAGE_C;
 968                         type                       = identify_new_type(new_type);
 969                         entity->declaration.type   = type;
 970                 }
 971         }
 972
 973         symbol_t *symbol = entity->base.symbol;
 974         ident    *id     = new_id_from_str(symbol->string);
 975
 976         /* already an entity defined? */
 977         ir_entity *irentity = entitymap_get(&entitymap, symbol);
 978         bool const has_body = entity->function.statement != NULL;
 979         if (irentity != NULL) {
 980                 if (get_entity_visibility(irentity) == ir_visibility_external
 981                                 && has_body) {
 982                         set_entity_visibility(irentity, ir_visibility_default);
 983                 }
 984                 goto entity_created;
 985         }
 986
 987         ir_type *ir_type_method;
 988         if (entity->function.need_closure)
 989                 ir_type_method = create_method_type(&entity->declaration.type->function, true);
 990         else
 991                 ir_type_method = get_ir_type(entity->declaration.type);
 992
 993         bool nested_function = false;
 994         if (owner_type == NULL)
 995                 owner_type = get_glob_type();
 996         else
 997                 nested_function = true;
 998
 999         dbg_info *const dbgi = get_dbg_info(&entity->base.source_position);
1000         irentity = new_d_entity(owner_type, id, ir_type_method, dbgi);
1001
1002         ident *ld_id;
1003         if (nested_function)
1004                 ld_id = id_unique("inner.%u");
1005         else
1006                 ld_id = create_ld_ident(entity);
1007         set_entity_ld_ident(irentity, ld_id);
1008
1009         handle_decl_modifiers(irentity, entity);
1010
1011         if (! nested_function) {
1012                 /* static inline             => local
1013                  * extern inline             => local
1014                  * inline without definition => local
1015                  * inline with definition    => external_visible */
1016                 storage_class_tag_t const storage_class
1017                         = (storage_class_tag_t) entity->declaration.storage_class;
1018                 bool                const is_inline     = entity->function.is_inline;
1019
1020                 if (is_inline && storage_class == STORAGE_CLASS_NONE && has_body) {
1021                     set_entity_visibility(irentity, ir_visibility_default);
1022                 } else if (storage_class == STORAGE_CLASS_STATIC ||
1023                            (is_inline && has_body)) {
1024                     set_entity_visibility(irentity, ir_visibility_local);
1025                 } else if (has_body) {
1026                     set_entity_visibility(irentity, ir_visibility_default);
1027                 } else {
1028                     set_entity_visibility(irentity, ir_visibility_external);
1029                 }
1030         } else {
1031                 /* nested functions are always local */
1032                 set_entity_visibility(irentity, ir_visibility_local);
1033         }
1034
1035         /* We should check for file scope here, but as long as we compile C only
1036            this is not needed. */
1037         if (!freestanding && !has_body) {
1038                 /* check for a known runtime function */
1039                 for (size_t i = 0; i < lengthof(rts_data); ++i) {
1040                         if (id != rts_idents[i])
1041                                 continue;
1042
1043                         function_type_t *function_type
1044                                 = &entity->declaration.type->function;
1045                         /* rts_entities code can't handle a "wrong" number of parameters */
1046                         if (function_type->unspecified_parameters)
1047                                 continue;
1048
1049                         /* check number of parameters */
1050                         int n_params = count_parameters(function_type);
1051                         if (n_params != rts_data[i].n_params)
1052                                 continue;
1053
1054                         type_t *return_type = skip_typeref(function_type->return_type);
1055                         int     n_res       = return_type != type_void ? 1 : 0;
1056                         if (n_res != rts_data[i].n_res)
1057                                 continue;
1058
1059                         /* ignore those rts functions not necessary needed for current mode */
1060                         if ((c_mode & rts_data[i].flags) == 0)
1061                                 continue;
1062                         assert(rts_entities[rts_data[i].id] == NULL);
1063                         rts_entities[rts_data[i].id] = irentity;
1064                 }
1065         }
1066
1067         entitymap_insert(&entitymap, symbol, irentity);
1068
1069 entity_created:
1070         entity->declaration.kind  = DECLARATION_KIND_FUNCTION;
1071         entity->function.irentity = irentity;
1072
1073         return irentity;
1074 }
1075
1076 /**
1077  * Creates a SymConst for a given entity.
1078  *
1079  * @param dbgi    debug info
1080  * @param entity  the entity
1081  */
1082 static ir_node *create_symconst(dbg_info *dbgi, ir_entity *entity)
1083 {
1084         assert(entity != NULL);
1085         union symconst_symbol sym;
1086         sym.entity_p = entity;
1087         return new_d_SymConst(dbgi, mode_P, sym, symconst_addr_ent);
1088 }
1089
1090 static ir_node *create_conv(dbg_info *dbgi, ir_node *value, ir_mode *dest_mode)
1091 {
1092         ir_mode *value_mode = get_irn_mode(value);
1093
1094         if (value_mode == dest_mode)
1095                 return value;
1096
1097         if (dest_mode == mode_b) {
1098                 ir_node *zero = new_Const(get_mode_null(value_mode));
1099                 ir_node *cmp  = new_d_Cmp(dbgi, value, zero, ir_relation_less_greater);
1100                 return cmp;
1101         }
1102
1103         return new_d_Conv(dbgi, value, dest_mode);
1104 }
1105
1106 static ir_node *create_Const_from_bool(ir_mode *const mode, bool const v)
1107 {
1108         return new_Const((v ? get_mode_one : get_mode_null)(mode));
1109 }
1110
1111 /**
1112  * Creates a SymConst node representing a wide string literal.
1113  *
1114  * @param literal   the wide string literal
1115  */
1116 static ir_node *wide_string_literal_to_firm(
1117                 const string_literal_expression_t *literal)
1118 {
1119         ir_type  *const global_type = get_glob_type();
1120         ir_type  *const elem_type   = ir_type_wchar_t;
1121         dbg_info *const dbgi        = get_dbg_info(&literal->base.source_position);
1122         ir_type  *const type        = new_type_array(1, elem_type);
1123
1124         ident     *const id     = id_unique("str.%u");
1125         ir_entity *const entity = new_d_entity(global_type, id, type, dbgi);
1126         set_entity_ld_ident(entity, id);
1127         set_entity_visibility(entity, ir_visibility_private);
1128         add_entity_linkage(entity, IR_LINKAGE_CONSTANT);
1129
1130         ir_mode      *const mode = get_type_mode(elem_type);
1131         const size_t        slen = wstrlen(&literal->value);
1132
1133         set_array_lower_bound_int(type, 0, 0);
1134         set_array_upper_bound_int(type, 0, slen);
1135         set_type_size_bytes(type, slen * get_mode_size_bytes(mode));
1136         set_type_state(type, layout_fixed);
1137
1138         ir_initializer_t *initializer = create_initializer_compound(slen);
1139         const char              *p    = literal->value.begin;
1140         for (size_t i = 0; i < slen; ++i) {
1141                 assert(p < literal->value.begin + literal->value.size);
1142                 utf32             v   = read_utf8_char(&p);
1143                 ir_tarval        *tv  = new_tarval_from_long(v, mode);
1144                 ir_initializer_t *val = create_initializer_tarval(tv);
1145                 set_initializer_compound_value(initializer, i, val);
1146         }
1147         set_entity_initializer(entity, initializer);
1148
1149         return create_symconst(dbgi, entity);
1150 }
1151
1152 /**
1153  * Creates a SymConst node representing a string constant.
1154  *
1155  * @param src_pos    the source position of the string constant
1156  * @param id_prefix  a prefix for the name of the generated string constant
1157  * @param value      the value of the string constant
1158  */
1159 static ir_node *string_to_firm(const source_position_t *const src_pos,
1160                                const char *const id_prefix,
1161                                const string_t *const value)
1162 {
1163         ir_type  *const global_type = get_glob_type();
1164         dbg_info *const dbgi        = get_dbg_info(src_pos);
1165         ir_type  *const type        = new_type_array(1, ir_type_const_char);
1166
1167         ident     *const id     = id_unique(id_prefix);
1168         ir_entity *const entity = new_d_entity(global_type, id, type, dbgi);
1169         set_entity_ld_ident(entity, id);
1170         set_entity_visibility(entity, ir_visibility_private);
1171         add_entity_linkage(entity, IR_LINKAGE_CONSTANT);
1172
1173         ir_type *const elem_type = ir_type_const_char;
1174         ir_mode *const mode      = get_type_mode(elem_type);
1175
1176         const char* const string = value->begin;
1177         const size_t      slen   = value->size;
1178
1179         set_array_lower_bound_int(type, 0, 0);
1180         set_array_upper_bound_int(type, 0, slen);
1181         set_type_size_bytes(type, slen);
1182         set_type_state(type, layout_fixed);
1183
1184         ir_initializer_t *initializer = create_initializer_compound(slen);
1185         for (size_t i = 0; i < slen; ++i) {
1186                 ir_tarval        *tv  = new_tarval_from_long(string[i], mode);
1187                 ir_initializer_t *val = create_initializer_tarval(tv);
1188                 set_initializer_compound_value(initializer, i, val);
1189         }
1190         set_entity_initializer(entity, initializer);
1191
1192         return create_symconst(dbgi, entity);
1193 }
1194
1195 static bool try_create_integer(literal_expression_t *literal,
1196                                type_t *type, unsigned char base)
1197 {
1198         const char *string = literal->value.begin;
1199         size_t      size   = literal->value.size;
1200
1201         assert(type->kind == TYPE_ATOMIC);
1202         atomic_type_kind_t akind = type->atomic.akind;
1203
1204         ir_mode   *mode = atomic_modes[akind];
1205         ir_tarval *tv   = new_integer_tarval_from_str(string, size, 1, base, mode);
1206         if (tv == tarval_bad)
1207                 return false;
1208
1209         literal->base.type    = type;
1210         literal->target_value = tv;
1211         return true;
1212 }
1213
1214 static void create_integer_tarval(literal_expression_t *literal)
1215 {
1216         unsigned        us     = 0;
1217         unsigned        ls     = 0;
1218         const string_t *suffix = &literal->suffix;
1219         /* parse suffix */
1220         if (suffix->size > 0) {
1221                 for (const char *c = suffix->begin; *c != '\0'; ++c) {
1222                         if (*c == 'u' || *c == 'U') { ++us; }
1223                         if (*c == 'l' || *c == 'L') { ++ls; }
1224                 }
1225         }
1226
1227         unsigned base;
1228         switch (literal->base.kind) {
1229                 case EXPR_LITERAL_INTEGER_OCTAL:       base =  8; break;
1230                 case EXPR_LITERAL_INTEGER:             base = 10; break;
1231                 case EXPR_LITERAL_INTEGER_HEXADECIMAL: base = 16; break;
1232                 default: panic("invalid literal kind");
1233         }
1234
1235         tarval_int_overflow_mode_t old_mode = tarval_get_integer_overflow_mode();
1236
1237         /* now try if the constant is small enough for some types */
1238         tarval_set_integer_overflow_mode(TV_OVERFLOW_BAD);
1239         if (ls < 1) {
1240                 if (us == 0 && try_create_integer(literal, type_int, base))
1241                         goto finished;
1242                 if ((us == 1 || base != 10)
1243                                 && try_create_integer(literal, type_unsigned_int, base))
1244                         goto finished;
1245         }
1246         if (ls < 2) {
1247                 if (us == 0 && try_create_integer(literal, type_long, base))
1248                         goto finished;
1249                 if ((us == 1 || base != 10)
1250                                 && try_create_integer(literal, type_unsigned_long, base))
1251                         goto finished;
1252         }
1253         /* last try? then we should not report tarval_bad */
1254         if (us != 1 && base == 10)
1255                 tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
1256         if (us == 0 && try_create_integer(literal, type_long_long, base))
1257                 goto finished;
1258
1259         /* last try */
1260         assert(us == 1 || base != 10);
1261         tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
1262         bool res = try_create_integer(literal, type_unsigned_long_long, base);
1263         if (!res)
1264                 panic("internal error when parsing number literal");
1265
1266 finished:
1267         tarval_set_integer_overflow_mode(old_mode);
1268 }
1269
1270 void determine_literal_type(literal_expression_t *literal)
1271 {
1272         switch (literal->base.kind) {
1273         case EXPR_LITERAL_INTEGER:
1274         case EXPR_LITERAL_INTEGER_OCTAL:
1275         case EXPR_LITERAL_INTEGER_HEXADECIMAL:
1276                 create_integer_tarval(literal);
1277                 return;
1278         default:
1279                 break;
1280         }
1281 }
1282
1283 /**
1284  * Creates a Const node representing a constant.
1285  */
1286 static ir_node *literal_to_firm(const literal_expression_t *literal)
1287 {
1288         type_t     *type   = skip_typeref(literal->base.type);
1289         ir_mode    *mode   = get_ir_mode_storage(type);
1290         const char *string = literal->value.begin;
1291         size_t      size   = literal->value.size;
1292         ir_tarval  *tv;
1293
1294         switch (literal->base.kind) {
1295         case EXPR_LITERAL_WIDE_CHARACTER: {
1296                 utf32  v = read_utf8_char(&string);
1297                 char   buf[128];
1298                 size_t len = snprintf(buf, sizeof(buf), UTF32_PRINTF_FORMAT, v);
1299
1300                 tv = new_tarval_from_str(buf, len, mode);
1301                 goto make_const;
1302         }
1303         case EXPR_LITERAL_CHARACTER: {
1304                 long long int v;
1305                 bool char_is_signed
1306                         = get_atomic_type_flags(ATOMIC_TYPE_CHAR) & ATOMIC_TYPE_FLAG_SIGNED;
1307                 if (size == 1 && char_is_signed) {
1308                         v = (signed char)string[0];
1309                 } else {
1310                         v = 0;
1311                         for (size_t i = 0; i < size; ++i) {
1312                                 v = (v << 8) | ((unsigned char)string[i]);
1313                         }
1314                 }
1315                 char   buf[128];
1316                 size_t len = snprintf(buf, sizeof(buf), "%lld", v);
1317
1318                 tv = new_tarval_from_str(buf, len, mode);
1319                 goto make_const;
1320         }
1321         case EXPR_LITERAL_INTEGER:
1322         case EXPR_LITERAL_INTEGER_OCTAL:
1323         case EXPR_LITERAL_INTEGER_HEXADECIMAL:
1324                 assert(literal->target_value != NULL);
1325                 tv = literal->target_value;
1326                 goto make_const;
1327         case EXPR_LITERAL_FLOATINGPOINT:
1328                 tv = new_tarval_from_str(string, size, mode);
1329                 goto make_const;
1330         case EXPR_LITERAL_FLOATINGPOINT_HEXADECIMAL: {
1331                 char buffer[size + 2];
1332                 memcpy(buffer, "0x", 2);
1333                 memcpy(buffer+2, string, size);
1334                 tv = new_tarval_from_str(buffer, size+2, mode);
1335                 goto make_const;
1336         }
1337         case EXPR_LITERAL_BOOLEAN:
1338                 if (string[0] == 't') {
1339                         tv = get_mode_one(mode);
1340                 } else {
1341                         assert(string[0] == 'f');
1342                         tv = get_mode_null(mode);
1343                 }
1344                 goto make_const;
1345         case EXPR_LITERAL_MS_NOOP:
1346                 tv = get_mode_null(mode);
1347                 goto make_const;
1348         default:
1349                 break;
1350         }
1351         panic("Invalid literal kind found");
1352
1353 make_const: ;
1354         dbg_info *dbgi       = get_dbg_info(&literal->base.source_position);
1355         ir_node  *res        = new_d_Const(dbgi, tv);
1356         ir_mode  *mode_arith = get_ir_mode_arithmetic(type);
1357         return create_conv(dbgi, res, mode_arith);
1358 }
1359
1360 /*
1361  * Allocate an area of size bytes aligned at alignment
1362  * at a frame type.
1363  */
1364 static ir_entity *alloc_trampoline(ir_type *frame_type, int size, unsigned alignment)
1365 {
1366         static unsigned area_cnt = 0;
1367         char buf[32];
1368
1369         ir_type *tp = new_type_array(1, ir_type_char);
1370         set_array_bounds_int(tp, 0, 0, size);
1371         set_type_alignment_bytes(tp, alignment);
1372
1373         snprintf(buf, sizeof(buf), "trampolin%u", area_cnt++);
1374         ident *name = new_id_from_str(buf);
1375         ir_entity *area = new_entity(frame_type, name, tp);
1376
1377         /* mark this entity as compiler generated */
1378         set_entity_compiler_generated(area, 1);
1379         return area;
1380 }
1381
1382 /**
1383  * Return a node representing a trampoline region
1384  * for a given function entity.
1385  *
1386  * @param dbgi    debug info
1387  * @param entity  the function entity
1388  */
1389 static ir_node *get_trampoline_region(dbg_info *dbgi, ir_entity *entity)
1390 {
1391         ir_entity *region = NULL;
1392         int        i;
1393
1394         if (current_trampolines != NULL) {
1395                 for (i = ARR_LEN(current_trampolines) - 1; i >= 0; --i) {
1396                         if (current_trampolines[i].function == entity) {
1397                                 region = current_trampolines[i].region;
1398                                 break;
1399                         }
1400                 }
1401         } else {
1402                 current_trampolines = NEW_ARR_F(trampoline_region, 0);
1403         }
1404         ir_graph *irg = current_ir_graph;
1405         if (region == NULL) {
1406                 /* create a new region */
1407                 ir_type           *frame_tp = get_irg_frame_type(irg);
1408                 trampoline_region  reg;
1409                 reg.function = entity;
1410
1411                 reg.region   = alloc_trampoline(frame_tp,
1412                                                 be_params->trampoline_size,
1413                                                 be_params->trampoline_align);
1414                 ARR_APP1(trampoline_region, current_trampolines, reg);
1415                 region = reg.region;
1416         }
1417         return new_d_simpleSel(dbgi, get_irg_no_mem(irg), get_irg_frame(irg),
1418                                region);
1419 }
1420
1421 /**
1422  * Creates a trampoline for a function represented by an entity.
1423  *
1424  * @param dbgi    debug info
1425  * @param mode    the (reference) mode for the function address
1426  * @param entity  the function entity
1427  */
1428 static ir_node *create_trampoline(dbg_info *dbgi, ir_mode *mode,
1429                                   ir_entity *entity)
1430 {
1431         assert(entity != NULL);
1432         ir_node *in[3];
1433         in[0] = get_trampoline_region(dbgi, entity);
1434         in[1] = create_symconst(dbgi, entity);
1435         in[2] = get_irg_frame(current_ir_graph);
1436
1437         ir_node *irn = new_d_Builtin(dbgi, get_store(), 3, in, ir_bk_inner_trampoline, get_unknown_type());
1438         set_store(new_Proj(irn, mode_M, pn_Builtin_M));
1439         return new_Proj(irn, mode, pn_Builtin_1_result);
1440 }
1441
1442 /**
1443  * Dereference an address.
1444  *
1445  * @param dbgi  debug info
1446  * @param type  the type of the dereferenced result (the points_to type)
1447  * @param addr  the address to dereference
1448  */
1449 static ir_node *deref_address(dbg_info *const dbgi, type_t *const type,
1450                                       ir_node *const addr)
1451 {
1452         type_t *skipped = skip_typeref(type);
1453         if (is_type_incomplete(skipped))
1454                 return addr;
1455
1456         ir_type *irtype = get_ir_type(skipped);
1457         if (is_compound_type(irtype)
1458             || is_Method_type(irtype)
1459             || is_Array_type(irtype)) {
1460                 return addr;
1461         }
1462
1463         ir_cons_flags  flags    = skipped->base.qualifiers & TYPE_QUALIFIER_VOLATILE
1464                                   ? cons_volatile : cons_none;
1465         ir_mode *const mode     = get_type_mode(irtype);
1466         ir_node *const memory   = get_store();
1467         ir_node *const load     = new_d_Load(dbgi, memory, addr, mode, flags);
1468         ir_node *const load_mem = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1469         ir_node *const load_res = new_d_Proj(dbgi, load, mode,   pn_Load_res);
1470
1471         set_store(load_mem);
1472
1473         ir_mode *const mode_arithmetic = get_ir_mode_arithmetic(skipped);
1474         return create_conv(dbgi, load_res, mode_arithmetic);
1475 }
1476
1477 /**
1478  * Creates a strict Conv (to the node's mode) if necessary.
1479  *
1480  * @param dbgi  debug info
1481  * @param node  the node to strict conv
1482  */
1483 static ir_node *do_strict_conv(dbg_info *dbgi, ir_node *node)
1484 {
1485         ir_mode *mode = get_irn_mode(node);
1486
1487         if (!(get_irg_fp_model(current_ir_graph) & fp_explicit_rounding))
1488                 return node;
1489         if (!mode_is_float(mode))
1490                 return node;
1491
1492         /* check if there is already a Conv */
1493         if (is_Conv(node)) {
1494                 /* convert it into a strict Conv */
1495                 set_Conv_strict(node, 1);
1496                 return node;
1497         }
1498
1499         /* otherwise create a new one */
1500         return new_d_strictConv(dbgi, node, mode);
1501 }
1502
1503 /**
1504  * Returns the correct base address depending on whether it is a parameter or a
1505  * normal local variable.
1506  */
1507 static ir_node *get_local_frame(ir_entity *const ent)
1508 {
1509         ir_graph      *const irg   = current_ir_graph;
1510         const ir_type *const owner = get_entity_owner(ent);
1511         if (owner == current_outer_frame) {
1512                 assert(current_static_link != NULL);
1513                 return current_static_link;
1514         } else {
1515                 return get_irg_frame(irg);
1516         }
1517 }
1518
1519 /**
1520  * Keep all memory edges of the given block.
1521  */
1522 static void keep_all_memory(ir_node *block)
1523 {
1524         ir_node *old = get_cur_block();
1525
1526         set_cur_block(block);
1527         keep_alive(get_store());
1528         /* TODO: keep all memory edges from restricted pointers */
1529         set_cur_block(old);
1530 }
1531
1532 static ir_node *reference_expression_enum_value_to_firm(
1533                 const reference_expression_t *ref)
1534 {
1535         entity_t *entity = ref->entity;
1536         if (entity->enum_value.tv == NULL) {
1537                 type_t *type = skip_typeref(entity->enum_value.enum_type);
1538                 assert(type->kind == TYPE_ENUM);
1539                 determine_enum_values(&type->enumt);
1540         }
1541
1542         return new_Const(entity->enum_value.tv);
1543 }
1544
1545 static ir_node *reference_expression_to_firm(const reference_expression_t *ref)
1546 {
1547         dbg_info *dbgi   = get_dbg_info(&ref->base.source_position);
1548         entity_t *entity = ref->entity;
1549         assert(is_declaration(entity));
1550         type_t   *type   = skip_typeref(entity->declaration.type);
1551
1552         /* make sure the type is constructed */
1553         (void) get_ir_type(type);
1554
1555         if (entity->kind == ENTITY_FUNCTION
1556             && entity->function.btk != BUILTIN_NONE) {
1557                 ir_entity *irentity = get_function_entity(entity, NULL);
1558                 /* for gcc compatibility we have to produce (dummy) addresses for some
1559                  * builtins which don't have entities */
1560                 if (irentity == NULL) {
1561                         source_position_t const *const pos = &ref->base.source_position;
1562                         symbol_t          const *const sym = ref->entity->base.symbol;
1563                         warningf(WARN_OTHER, pos, "taking address of builtin '%Y'", sym);
1564
1565                         /* simply create a NULL pointer */
1566                         ir_mode  *mode = get_ir_mode_arithmetic(type_void_ptr);
1567                         ir_node  *res  = new_Const(get_mode_null(mode));
1568
1569                         return res;
1570                 }
1571         }
1572
1573         switch ((declaration_kind_t) entity->declaration.kind) {
1574         case DECLARATION_KIND_UNKNOWN:
1575                 break;
1576
1577         case DECLARATION_KIND_LOCAL_VARIABLE: {
1578                 ir_mode *const mode  = get_ir_mode_storage(type);
1579                 ir_node *const value = get_value(entity->variable.v.value_number, mode);
1580                 return create_conv(NULL, value, get_ir_mode_arithmetic(type));
1581         }
1582         case DECLARATION_KIND_PARAMETER: {
1583                 ir_mode *const mode  = get_ir_mode_storage(type);
1584                 ir_node *const value = get_value(entity->parameter.v.value_number,mode);
1585                 return create_conv(NULL, value, get_ir_mode_arithmetic(type));
1586         }
1587         case DECLARATION_KIND_FUNCTION: {
1588                 return create_symconst(dbgi, entity->function.irentity);
1589         }
1590         case DECLARATION_KIND_INNER_FUNCTION: {
1591                 ir_mode *const mode = get_ir_mode_storage(type);
1592                 if (!entity->function.goto_to_outer && !entity->function.need_closure) {
1593                         /* inner function not using the closure */
1594                         return create_symconst(dbgi, entity->function.irentity);
1595                 } else {
1596                         /* need trampoline here */
1597                         return create_trampoline(dbgi, mode, entity->function.irentity);
1598                 }
1599         }
1600         case DECLARATION_KIND_GLOBAL_VARIABLE: {
1601                 const variable_t *variable = &entity->variable;
1602                 ir_node *const addr = create_symconst(dbgi, variable->v.entity);
1603                 return deref_address(dbgi, variable->base.type, addr);
1604         }
1605
1606         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY: {
1607                 ir_entity *irentity = entity->variable.v.entity;
1608                 ir_node   *frame    = get_local_frame(irentity);
1609                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1610                 return deref_address(dbgi, entity->declaration.type, sel);
1611         }
1612         case DECLARATION_KIND_PARAMETER_ENTITY: {
1613                 ir_entity *irentity = entity->parameter.v.entity;
1614                 ir_node   *frame    = get_local_frame(irentity);
1615                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1616                 return deref_address(dbgi, entity->declaration.type, sel);
1617         }
1618
1619         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
1620                 return entity->variable.v.vla_base;
1621
1622         case DECLARATION_KIND_COMPOUND_MEMBER:
1623                 panic("not implemented reference type");
1624         }
1625
1626         panic("reference to declaration with unknown type found");
1627 }
1628
1629 static ir_node *reference_addr(const reference_expression_t *ref)
1630 {
1631         dbg_info *dbgi   = get_dbg_info(&ref->base.source_position);
1632         entity_t *entity = ref->entity;
1633         assert(is_declaration(entity));
1634
1635         switch((declaration_kind_t) entity->declaration.kind) {
1636         case DECLARATION_KIND_UNKNOWN:
1637                 break;
1638         case DECLARATION_KIND_PARAMETER:
1639         case DECLARATION_KIND_LOCAL_VARIABLE:
1640                 /* you can store to a local variable (so we don't panic but return NULL
1641                  * as an indicator for no real address) */
1642                 return NULL;
1643         case DECLARATION_KIND_GLOBAL_VARIABLE: {
1644                 ir_node *const addr = create_symconst(dbgi, entity->variable.v.entity);
1645                 return addr;
1646         }
1647         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY: {
1648                 ir_entity *irentity = entity->variable.v.entity;
1649                 ir_node   *frame    = get_local_frame(irentity);
1650                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1651
1652                 return sel;
1653         }
1654         case DECLARATION_KIND_PARAMETER_ENTITY: {
1655                 ir_entity *irentity = entity->parameter.v.entity;
1656                 ir_node   *frame    = get_local_frame(irentity);
1657                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1658
1659                 return sel;
1660         }
1661
1662         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
1663                 return entity->variable.v.vla_base;
1664
1665         case DECLARATION_KIND_FUNCTION: {
1666                 return create_symconst(dbgi, entity->function.irentity);
1667         }
1668
1669         case DECLARATION_KIND_INNER_FUNCTION: {
1670                 type_t  *const type = skip_typeref(entity->declaration.type);
1671                 ir_mode *const mode = get_ir_mode_storage(type);
1672                 if (!entity->function.goto_to_outer && !entity->function.need_closure) {
1673                         /* inner function not using the closure */
1674                         return create_symconst(dbgi, entity->function.irentity);
1675                 } else {
1676                         /* need trampoline here */
1677                         return create_trampoline(dbgi, mode, entity->function.irentity);
1678                 }
1679         }
1680
1681         case DECLARATION_KIND_COMPOUND_MEMBER:
1682                 panic("not implemented reference type");
1683         }
1684
1685         panic("reference to declaration with unknown type found");
1686 }
1687
1688 /**
1689  * Transform calls to builtin functions.
1690  */
1691 static ir_node *process_builtin_call(const call_expression_t *call)
1692 {
1693         dbg_info *dbgi = get_dbg_info(&call->base.source_position);
1694
1695         assert(call->function->kind == EXPR_REFERENCE);
1696         reference_expression_t *builtin = &call->function->reference;
1697
1698         type_t *expr_type = skip_typeref(builtin->base.type);
1699         assert(is_type_pointer(expr_type));
1700
1701         type_t *function_type = skip_typeref(expr_type->pointer.points_to);
1702
1703         switch (builtin->entity->function.btk) {
1704         case BUILTIN_NONE:
1705                 break;
1706         case BUILTIN_ALLOCA: {
1707                 expression_t *argument = call->arguments->expression;
1708                 ir_node      *size     = expression_to_firm(argument);
1709
1710                 ir_node *store  = get_store();
1711                 ir_node *alloca = new_d_Alloc(dbgi, store, size, firm_unknown_type,
1712                                               stack_alloc);
1713                 ir_node *proj_m = new_Proj(alloca, mode_M, pn_Alloc_M);
1714                 set_store(proj_m);
1715                 ir_node *res    = new_Proj(alloca, mode_P_data, pn_Alloc_res);
1716
1717                 return res;
1718         }
1719         case BUILTIN_INF: {
1720                 type_t    *type = function_type->function.return_type;
1721                 ir_mode   *mode = get_ir_mode_arithmetic(type);
1722                 ir_tarval *tv   = get_mode_infinite(mode);
1723                 ir_node   *res  = new_d_Const(dbgi, tv);
1724                 return res;
1725         }
1726         case BUILTIN_NAN: {
1727                 /* Ignore string for now... */
1728                 assert(is_type_function(function_type));
1729                 type_t    *type = function_type->function.return_type;
1730                 ir_mode   *mode = get_ir_mode_arithmetic(type);
1731                 ir_tarval *tv   = get_mode_NAN(mode);
1732                 ir_node   *res  = new_d_Const(dbgi, tv);
1733                 return res;
1734         }
1735         case BUILTIN_EXPECT: {
1736                 expression_t *argument = call->arguments->expression;
1737                 return _expression_to_firm(argument);
1738         }
1739         case BUILTIN_VA_END:
1740                 /* evaluate the argument of va_end for its side effects */
1741                 _expression_to_firm(call->arguments->expression);
1742                 return NULL;
1743         case BUILTIN_OBJECT_SIZE: {
1744                 /* determine value of "type" */
1745                 expression_t *type_expression = call->arguments->next->expression;
1746                 long          type_val        = fold_constant_to_int(type_expression);
1747                 type_t       *type            = function_type->function.return_type;
1748                 ir_mode      *mode            = get_ir_mode_arithmetic(type);
1749                 /* just produce a "I don't know" result */
1750                 ir_tarval    *result          = type_val & 2 ? get_mode_null(mode) :
1751                                                 get_mode_minus_one(mode);
1752
1753                 return new_d_Const(dbgi, result);
1754         }
1755         case BUILTIN_ROTL: {
1756                 ir_node *val  = expression_to_firm(call->arguments->expression);
1757                 ir_node *shf  = expression_to_firm(call->arguments->next->expression);
1758                 ir_mode *mode = get_irn_mode(val);
1759                 return new_d_Rotl(dbgi, val, create_conv(dbgi, shf, mode_uint), mode);
1760         }
1761         case BUILTIN_ROTR: {
1762                 ir_node *val  = expression_to_firm(call->arguments->expression);
1763                 ir_node *shf  = expression_to_firm(call->arguments->next->expression);
1764                 ir_mode *mode = get_irn_mode(val);
1765                 ir_node *c    = new_Const_long(mode_uint, get_mode_size_bits(mode));
1766                 ir_node *sub  = new_d_Sub(dbgi, c, create_conv(dbgi, shf, mode_uint), mode_uint);
1767                 return new_d_Rotl(dbgi, val, sub, mode);
1768         }
1769         case BUILTIN_FIRM:
1770                 break;
1771         case BUILTIN_LIBC:
1772         case BUILTIN_LIBC_CHECK:
1773                 panic("builtin did not produce an entity");
1774         }
1775         panic("invalid builtin found");
1776 }
1777
1778 /**
1779  * Transform a call expression.
1780  * Handles some special cases, like alloca() calls, which must be resolved
1781  * BEFORE the inlines runs. Inlining routines calling alloca() is dangerous,
1782  * 176.gcc for instance might allocate 2GB instead of 256 MB if alloca is not
1783  * handled right...
1784  */
1785 static ir_node *call_expression_to_firm(const call_expression_t *const call)
1786 {
1787         dbg_info *const dbgi = get_dbg_info(&call->base.source_position);
1788         assert(currently_reachable());
1789
1790         expression_t   *function = call->function;
1791         ir_node        *callee   = NULL;
1792         bool            firm_builtin = false;
1793         ir_builtin_kind firm_builtin_kind = ir_bk_trap;
1794         if (function->kind == EXPR_REFERENCE) {
1795                 const reference_expression_t *ref    = &function->reference;
1796                 entity_t                     *entity = ref->entity;
1797
1798                 if (entity->kind == ENTITY_FUNCTION) {
1799                         builtin_kind_t builtin = entity->function.btk;
1800                         if (builtin == BUILTIN_FIRM) {
1801                                 firm_builtin = true;
1802                                 firm_builtin_kind = entity->function.b.firm_builtin_kind;
1803                         } else if (builtin != BUILTIN_NONE && builtin != BUILTIN_LIBC
1804                                    && builtin != BUILTIN_LIBC_CHECK) {
1805                                 return process_builtin_call(call);
1806                         }
1807                 }
1808         }
1809         if (!firm_builtin)
1810                 callee = expression_to_firm(function);
1811
1812         type_t *type = skip_typeref(function->base.type);
1813         assert(is_type_pointer(type));
1814         pointer_type_t *pointer_type = &type->pointer;
1815         type_t         *points_to    = skip_typeref(pointer_type->points_to);
1816         assert(is_type_function(points_to));
1817         function_type_t *function_type = &points_to->function;
1818
1819         int      n_parameters    = 0;
1820         ir_type *ir_method_type  = get_ir_type((type_t*) function_type);
1821         ir_type *new_method_type = NULL;
1822         if (function_type->variadic || function_type->unspecified_parameters) {
1823                 const call_argument_t *argument = call->arguments;
1824                 for ( ; argument != NULL; argument = argument->next) {
1825                         ++n_parameters;
1826                 }
1827
1828                 /* we need to construct a new method type matching the call
1829                  * arguments... */
1830                 type_dbg_info *tdbgi = get_type_dbg_info_((const type_t*) function_type);
1831                 int n_res       = get_method_n_ress(ir_method_type);
1832                 new_method_type = new_d_type_method(n_parameters, n_res, tdbgi);
1833                 set_method_calling_convention(new_method_type,
1834                                get_method_calling_convention(ir_method_type));
1835                 set_method_additional_properties(new_method_type,
1836                                get_method_additional_properties(ir_method_type));
1837                 set_method_variadicity(new_method_type,
1838                                        get_method_variadicity(ir_method_type));
1839
1840                 for (int i = 0; i < n_res; ++i) {
1841                         set_method_res_type(new_method_type, i,
1842                                             get_method_res_type(ir_method_type, i));
1843                 }
1844                 argument = call->arguments;
1845                 for (int i = 0; i < n_parameters; ++i, argument = argument->next) {
1846                         expression_t *expression = argument->expression;
1847                         ir_type      *irtype     = get_ir_type(expression->base.type);
1848                         set_method_param_type(new_method_type, i, irtype);
1849                 }
1850                 ir_method_type = new_method_type;
1851         } else {
1852                 n_parameters = get_method_n_params(ir_method_type);
1853         }
1854
1855         ir_node *in[n_parameters];
1856
1857         const call_argument_t *argument = call->arguments;
1858         for (int n = 0; n < n_parameters; ++n) {
1859                 expression_t *expression = argument->expression;
1860                 ir_node      *arg_node   = expression_to_firm(expression);
1861
1862                 type_t *arg_type = skip_typeref(expression->base.type);
1863                 if (!is_type_compound(arg_type)) {
1864                         ir_mode *mode = get_ir_mode_storage(expression->base.type);
1865                         arg_node      = create_conv(dbgi, arg_node, mode);
1866                         arg_node      = do_strict_conv(dbgi, arg_node);
1867                 }
1868
1869                 in[n] = arg_node;
1870
1871                 argument = argument->next;
1872         }
1873
1874         ir_node *store;
1875         if (function_type->modifiers & DM_CONST) {
1876                 store = get_irg_no_mem(current_ir_graph);
1877         } else {
1878                 store = get_store();
1879         }
1880
1881         ir_node *node;
1882         type_t  *return_type = skip_typeref(function_type->return_type);
1883         ir_node *result      = NULL;
1884         if (firm_builtin) {
1885                 node = new_d_Builtin(dbgi, store, n_parameters, in, firm_builtin_kind,
1886                                      ir_method_type);
1887                 if (! (function_type->modifiers & DM_CONST)) {
1888                         ir_node *mem = new_Proj(node, mode_M, pn_Builtin_M);
1889                         set_store(mem);
1890                 }
1891
1892                 if (!is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
1893                         assert(is_type_scalar(return_type));
1894                         ir_mode *mode = get_ir_mode_storage(return_type);
1895                         result = new_Proj(node, mode, pn_Builtin_1_result);
1896                         ir_mode *mode_arith = get_ir_mode_arithmetic(return_type);
1897                         result              = create_conv(NULL, result, mode_arith);
1898                 }
1899         } else {
1900                 node = new_d_Call(dbgi, store, callee, n_parameters, in, ir_method_type);
1901                 if (! (function_type->modifiers & DM_CONST)) {
1902                         ir_node *mem = new_Proj(node, mode_M, pn_Call_M);
1903                         set_store(mem);
1904                 }
1905
1906                 if (!is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
1907                         ir_node *resproj = new_Proj(node, mode_T, pn_Call_T_result);
1908
1909                         if (is_type_scalar(return_type)) {
1910                                 ir_mode *mode       = get_ir_mode_storage(return_type);
1911                                 result              = new_Proj(resproj, mode, 0);
1912                                 ir_mode *mode_arith = get_ir_mode_arithmetic(return_type);
1913                                 result              = create_conv(NULL, result, mode_arith);
1914                         } else {
1915                                 ir_mode *mode = mode_P_data;
1916                                 result        = new_Proj(resproj, mode, 0);
1917                         }
1918                 }
1919         }
1920
1921         if (function_type->modifiers & DM_NORETURN) {
1922                 /* A dead end:  Keep the Call and the Block.  Also place all further
1923                  * nodes into a new and unreachable block. */
1924                 keep_alive(node);
1925                 keep_alive(get_cur_block());
1926                 ir_node *block = new_Block(0, NULL);
1927                 set_cur_block(block);
1928         }
1929
1930         return result;
1931 }
1932
1933 static void statement_to_firm(statement_t *statement);
1934 static ir_node *compound_statement_to_firm(compound_statement_t *compound);
1935
1936 static ir_node *expression_to_addr(const expression_t *expression);
1937 static ir_node *create_condition_evaluation(const expression_t *expression,
1938                                             ir_node *true_block,
1939                                             ir_node *false_block);
1940
1941 static void assign_value(dbg_info *dbgi, ir_node *addr, type_t *type,
1942                          ir_node *value)
1943 {
1944         if (!is_type_compound(type)) {
1945                 ir_mode *mode = get_ir_mode_storage(type);
1946                 value         = create_conv(dbgi, value, mode);
1947                 value         = do_strict_conv(dbgi, value);
1948         }
1949
1950         ir_node *memory = get_store();
1951
1952         if (is_type_scalar(type)) {
1953                 ir_cons_flags flags = type->base.qualifiers & TYPE_QUALIFIER_VOLATILE
1954                                       ? cons_volatile : cons_none;
1955                 ir_node  *store     = new_d_Store(dbgi, memory, addr, value, flags);
1956                 ir_node  *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
1957                 set_store(store_mem);
1958         } else {
1959                 ir_type *irtype    = get_ir_type(type);
1960                 ir_node *copyb     = new_d_CopyB(dbgi, memory, addr, value, irtype);
1961                 ir_node *copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
1962                 set_store(copyb_mem);
1963         }
1964 }
1965
1966 static ir_tarval *create_bitfield_mask(ir_mode *mode, int offset, int size)
1967 {
1968         ir_tarval *all_one   = get_mode_all_one(mode);
1969         int        mode_size = get_mode_size_bits(mode);
1970
1971         assert(offset >= 0);
1972         assert(size   >= 0);
1973         assert(offset + size <= mode_size);
1974         if (size == mode_size) {
1975                 return all_one;
1976         }
1977
1978         long       shiftr    = get_mode_size_bits(mode) - size;
1979         long       shiftl    = offset;
1980         ir_tarval *tv_shiftr = new_tarval_from_long(shiftr, mode_uint);
1981         ir_tarval *tv_shiftl = new_tarval_from_long(shiftl, mode_uint);
1982         ir_tarval *mask0     = tarval_shr(all_one, tv_shiftr);
1983         ir_tarval *mask1     = tarval_shl(mask0, tv_shiftl);
1984
1985         return mask1;
1986 }
1987
1988 static ir_node *bitfield_store_to_firm(dbg_info *dbgi,
1989                 ir_entity *entity, ir_node *addr, ir_node *value, bool set_volatile,
1990                 bool need_return)
1991 {
1992         ir_type *entity_type = get_entity_type(entity);
1993         ir_type *base_type   = get_primitive_base_type(entity_type);
1994         ir_mode *mode        = get_type_mode(base_type);
1995
1996         value = create_conv(dbgi, value, mode);
1997
1998         /* kill upper bits of value and shift to right position */
1999         unsigned  bitoffset  = get_entity_offset_bits_remainder(entity);
2000         unsigned  bitsize    = get_mode_size_bits(get_type_mode(entity_type));
2001         unsigned  base_bits  = get_mode_size_bits(mode);
2002         unsigned  shiftwidth = base_bits - bitsize;
2003
2004         ir_node  *shiftcount = new_Const_long(mode_uint, shiftwidth);
2005         ir_node  *shiftl     = new_d_Shl(dbgi, value, shiftcount, mode);
2006
2007         unsigned  shrwidth   = base_bits - bitsize - bitoffset;
2008         ir_node  *shrconst   = new_Const_long(mode_uint, shrwidth);
2009         ir_node  *shiftr     = new_d_Shr(dbgi, shiftl, shrconst, mode);
2010
2011         /* load current value */
2012         ir_node   *mem             = get_store();
2013         ir_node   *load            = new_d_Load(dbgi, mem, addr, mode,
2014                                           set_volatile ? cons_volatile : cons_none);
2015         ir_node   *load_mem        = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
2016         ir_node   *load_res        = new_d_Proj(dbgi, load, mode, pn_Load_res);
2017         ir_tarval *shift_mask      = create_bitfield_mask(mode, bitoffset, bitsize);
2018         ir_tarval *inv_mask        = tarval_not(shift_mask);
2019         ir_node   *inv_mask_node   = new_d_Const(dbgi, inv_mask);
2020         ir_node   *load_res_masked = new_d_And(dbgi, load_res, inv_mask_node, mode);
2021
2022         /* construct new value and store */
2023         ir_node *new_val   = new_d_Or(dbgi, load_res_masked, shiftr, mode);
2024         ir_node *store     = new_d_Store(dbgi, load_mem, addr, new_val,
2025                                          set_volatile ? cons_volatile : cons_none);
2026         ir_node *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
2027         set_store(store_mem);
2028
2029         if (!need_return)
2030                 return NULL;
2031
2032         ir_node *res_shr;
2033         ir_node *count_res_shr = new_Const_long(mode_uint, base_bits - bitsize);
2034         if (mode_is_signed(mode)) {
2035                 res_shr = new_d_Shrs(dbgi, shiftl, count_res_shr, mode);
2036         } else {
2037                 res_shr = new_d_Shr(dbgi, shiftl, count_res_shr, mode);
2038         }
2039         return res_shr;
2040 }
2041
2042 static ir_node *bitfield_extract_to_firm(const select_expression_t *expression,
2043                                          ir_node *addr)
2044 {
2045         dbg_info *dbgi      = get_dbg_info(&expression->base.source_position);
2046         entity_t *entity    = expression->compound_entry;
2047         type_t   *base_type = entity->declaration.type;
2048         ir_mode  *mode      = get_ir_mode_storage(base_type);
2049         ir_node  *mem       = get_store();
2050         ir_node  *load      = new_d_Load(dbgi, mem, addr, mode, cons_none);
2051         ir_node  *load_mem  = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
2052         ir_node  *load_res  = new_d_Proj(dbgi, load, mode, pn_Load_res);
2053
2054         ir_mode  *amode     = mode;
2055         /* optimisation, since shifting in modes < machine_size is usually
2056          * less efficient */
2057         if (get_mode_size_bits(amode) < get_mode_size_bits(mode_uint)) {
2058                 amode = mode_uint;
2059         }
2060         unsigned amode_size = get_mode_size_bits(amode);
2061         load_res = create_conv(dbgi, load_res, amode);
2062
2063         set_store(load_mem);
2064
2065         /* kill upper bits */
2066         assert(expression->compound_entry->kind == ENTITY_COMPOUND_MEMBER);
2067         unsigned   bitoffset   = entity->compound_member.bit_offset;
2068         unsigned   bitsize     = entity->compound_member.bit_size;
2069         unsigned   shift_bitsl = amode_size - bitoffset - bitsize;
2070         ir_tarval *tvl         = new_tarval_from_long((long)shift_bitsl, mode_uint);
2071         ir_node   *countl      = new_d_Const(dbgi, tvl);
2072         ir_node   *shiftl      = new_d_Shl(dbgi, load_res, countl, amode);
2073
2074         unsigned   shift_bitsr = bitoffset + shift_bitsl;
2075         assert(shift_bitsr <= amode_size);
2076         ir_tarval *tvr         = new_tarval_from_long((long)shift_bitsr, mode_uint);
2077         ir_node   *countr      = new_d_Const(dbgi, tvr);
2078         ir_node   *shiftr;
2079         if (mode_is_signed(mode)) {
2080                 shiftr = new_d_Shrs(dbgi, shiftl, countr, amode);
2081         } else {
2082                 shiftr = new_d_Shr(dbgi, shiftl, countr, amode);
2083         }
2084
2085         type_t  *type    = expression->base.type;
2086         ir_mode *resmode = get_ir_mode_arithmetic(type);
2087         return create_conv(dbgi, shiftr, resmode);
2088 }
2089
2090 /* make sure the selected compound type is constructed */
2091 static void construct_select_compound(const select_expression_t *expression)
2092 {
2093         type_t *type = skip_typeref(expression->compound->base.type);
2094         if (is_type_pointer(type)) {
2095                 type = type->pointer.points_to;
2096         }
2097         (void) get_ir_type(type);
2098 }
2099
2100 static ir_node *set_value_for_expression_addr(const expression_t *expression,
2101                                               ir_node *value, ir_node *addr)
2102 {
2103         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2104         type_t   *type = skip_typeref(expression->base.type);
2105
2106         if (!is_type_compound(type)) {
2107                 ir_mode  *mode = get_ir_mode_storage(type);
2108                 value          = create_conv(dbgi, value, mode);
2109                 value          = do_strict_conv(dbgi, value);
2110         }
2111
2112         if (expression->kind == EXPR_REFERENCE) {
2113                 const reference_expression_t *ref = &expression->reference;
2114
2115                 entity_t *entity = ref->entity;
2116                 assert(is_declaration(entity));
2117                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2118                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE) {
2119                         set_value(entity->variable.v.value_number, value);
2120                         return value;
2121                 } else if (entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
2122                         set_value(entity->parameter.v.value_number, value);
2123                         return value;
2124                 }
2125         }
2126
2127         if (addr == NULL)
2128                 addr = expression_to_addr(expression);
2129         assert(addr != NULL);
2130
2131         if (expression->kind == EXPR_SELECT) {
2132                 const select_expression_t *select = &expression->select;
2133
2134                 construct_select_compound(select);
2135
2136                 entity_t *entity = select->compound_entry;
2137                 assert(entity->kind == ENTITY_COMPOUND_MEMBER);
2138                 if (entity->compound_member.bitfield) {
2139                         ir_entity *irentity = entity->compound_member.entity;
2140                         bool       set_volatile
2141                                 = select->base.type->base.qualifiers & TYPE_QUALIFIER_VOLATILE;
2142                         value = bitfield_store_to_firm(dbgi, irentity, addr, value,
2143                                                        set_volatile, true);
2144                         return value;
2145                 }
2146         }
2147
2148         assign_value(dbgi, addr, type, value);
2149         return value;
2150 }
2151
2152 static void set_value_for_expression(const expression_t *expression,
2153                                      ir_node *value)
2154 {
2155         set_value_for_expression_addr(expression, value, NULL);
2156 }
2157
2158 static ir_node *get_value_from_lvalue(const expression_t *expression,
2159                                       ir_node *addr)
2160 {
2161         if (expression->kind == EXPR_REFERENCE) {
2162                 const reference_expression_t *ref = &expression->reference;
2163
2164                 entity_t *entity = ref->entity;
2165                 assert(entity->kind == ENTITY_VARIABLE
2166                                 || entity->kind == ENTITY_PARAMETER);
2167                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2168                 int value_number;
2169                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE) {
2170                         value_number = entity->variable.v.value_number;
2171                         assert(addr == NULL);
2172                         type_t  *type = skip_typeref(expression->base.type);
2173                         ir_mode *mode = get_ir_mode_storage(type);
2174                         ir_node *res  = get_value(value_number, mode);
2175                         return create_conv(NULL, res, get_ir_mode_arithmetic(type));
2176                 } else if (entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
2177                         value_number = entity->parameter.v.value_number;
2178                         assert(addr == NULL);
2179                         type_t  *type = skip_typeref(expression->base.type);
2180                         ir_mode *mode = get_ir_mode_storage(type);
2181                         ir_node *res  = get_value(value_number, mode);
2182                         return create_conv(NULL, res, get_ir_mode_arithmetic(type));
2183                 }
2184         }
2185
2186         assert(addr != NULL);
2187         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2188
2189         ir_node *value;
2190         if (expression->kind == EXPR_SELECT &&
2191             expression->select.compound_entry->compound_member.bitfield) {
2192             construct_select_compound(&expression->select);
2193                 value = bitfield_extract_to_firm(&expression->select, addr);
2194         } else {
2195                 value = deref_address(dbgi, expression->base.type, addr);
2196         }
2197
2198         return value;
2199 }
2200
2201
2202 static ir_node *create_incdec(const unary_expression_t *expression)
2203 {
2204         dbg_info *const     dbgi = get_dbg_info(&expression->base.source_position);
2205         const expression_t *value_expr = expression->value;
2206         ir_node            *addr       = expression_to_addr(value_expr);
2207         ir_node            *value      = get_value_from_lvalue(value_expr, addr);
2208
2209         type_t  *type = skip_typeref(expression->base.type);
2210         ir_mode *mode = get_ir_mode_arithmetic(expression->base.type);
2211
2212         ir_node *offset;
2213         if (is_type_pointer(type)) {
2214                 pointer_type_t *pointer_type = &type->pointer;
2215                 offset = get_type_size_node(pointer_type->points_to);
2216         } else {
2217                 assert(is_type_arithmetic(type));
2218                 offset = new_Const(get_mode_one(mode));
2219         }
2220
2221         ir_node *result;
2222         ir_node *store_value;
2223         switch(expression->base.kind) {
2224         case EXPR_UNARY_POSTFIX_INCREMENT:
2225                 result      = value;
2226                 store_value = new_d_Add(dbgi, value, offset, mode);
2227                 break;
2228         case EXPR_UNARY_POSTFIX_DECREMENT:
2229                 result      = value;
2230                 store_value = new_d_Sub(dbgi, value, offset, mode);
2231                 break;
2232         case EXPR_UNARY_PREFIX_INCREMENT:
2233                 result      = new_d_Add(dbgi, value, offset, mode);
2234                 store_value = result;
2235                 break;
2236         case EXPR_UNARY_PREFIX_DECREMENT:
2237                 result      = new_d_Sub(dbgi, value, offset, mode);
2238                 store_value = result;
2239                 break;
2240         default:
2241                 panic("no incdec expr in create_incdec");
2242         }
2243
2244         set_value_for_expression_addr(value_expr, store_value, addr);
2245
2246         return result;
2247 }
2248
2249 static bool is_local_variable(expression_t *expression)
2250 {
2251         if (expression->kind != EXPR_REFERENCE)
2252                 return false;
2253         reference_expression_t *ref_expr = &expression->reference;
2254         entity_t               *entity   = ref_expr->entity;
2255         if (entity->kind != ENTITY_VARIABLE)
2256                 return false;
2257         assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2258         return entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE;
2259 }
2260
2261 static ir_relation get_relation(const expression_kind_t kind)
2262 {
2263         switch(kind) {
2264         case EXPR_BINARY_EQUAL:         return ir_relation_equal;
2265         case EXPR_BINARY_ISLESSGREATER: return ir_relation_less_greater;
2266         case EXPR_BINARY_NOTEQUAL:      return ir_relation_unordered_less_greater;
2267         case EXPR_BINARY_ISLESS:
2268         case EXPR_BINARY_LESS:          return ir_relation_less;
2269         case EXPR_BINARY_ISLESSEQUAL:
2270         case EXPR_BINARY_LESSEQUAL:     return ir_relation_less_equal;
2271         case EXPR_BINARY_ISGREATER:
2272         case EXPR_BINARY_GREATER:       return ir_relation_greater;
2273         case EXPR_BINARY_ISGREATEREQUAL:
2274         case EXPR_BINARY_GREATEREQUAL:  return ir_relation_greater_equal;
2275         case EXPR_BINARY_ISUNORDERED:   return ir_relation_unordered;
2276
2277         default:
2278                 break;
2279         }
2280         panic("trying to get pn_Cmp from non-comparison binexpr type");
2281 }
2282
2283 /**
2284  * Handle the assume optimizer hint: check if a Confirm
2285  * node can be created.
2286  *
2287  * @param dbi    debug info
2288  * @param expr   the IL assume expression
2289  *
2290  * we support here only some simple cases:
2291  *  - var rel const
2292  *  - const rel val
2293  *  - var rel var
2294  */
2295 static ir_node *handle_assume_compare(dbg_info *dbi,
2296                                       const binary_expression_t *expression)
2297 {
2298         expression_t *op1 = expression->left;
2299         expression_t *op2 = expression->right;
2300         entity_t     *var2, *var = NULL;
2301         ir_node      *res      = NULL;
2302         ir_relation   relation = get_relation(expression->base.kind);
2303
2304         if (is_local_variable(op1) && is_local_variable(op2)) {
2305                 var  = op1->reference.entity;
2306             var2 = op2->reference.entity;
2307
2308                 type_t  *const type = skip_typeref(var->declaration.type);
2309                 ir_mode *const mode = get_ir_mode_storage(type);
2310
2311                 ir_node *const irn1 = get_value(var->variable.v.value_number, mode);
2312                 ir_node *const irn2 = get_value(var2->variable.v.value_number, mode);
2313
2314                 res = new_d_Confirm(dbi, irn2, irn1, get_inversed_relation(relation));
2315                 set_value(var2->variable.v.value_number, res);
2316
2317                 res = new_d_Confirm(dbi, irn1, irn2, relation);
2318                 set_value(var->variable.v.value_number, res);
2319
2320                 return res;
2321         }
2322
2323         expression_t *con = NULL;
2324         if (is_local_variable(op1) && is_constant_expression(op2) == EXPR_CLASS_CONSTANT) {
2325                 var = op1->reference.entity;
2326                 con = op2;
2327         } else if (is_constant_expression(op1) == EXPR_CLASS_CONSTANT && is_local_variable(op2)) {
2328                 relation = get_inversed_relation(relation);
2329                 var = op2->reference.entity;
2330                 con = op1;
2331         }
2332
2333         if (var != NULL) {
2334                 type_t  *const type = skip_typeref(var->declaration.type);
2335                 ir_mode *const mode = get_ir_mode_storage(type);
2336
2337                 res = get_value(var->variable.v.value_number, mode);
2338                 res = new_d_Confirm(dbi, res, expression_to_firm(con), relation);
2339                 set_value(var->variable.v.value_number, res);
2340         }
2341         return res;
2342 }
2343
2344 /**
2345  * Handle the assume optimizer hint.
2346  *
2347  * @param dbi    debug info
2348  * @param expr   the IL assume expression
2349  */
2350 static ir_node *handle_assume(dbg_info *dbi, const expression_t *expression)
2351 {
2352         switch(expression->kind) {
2353         case EXPR_BINARY_EQUAL:
2354         case EXPR_BINARY_NOTEQUAL:
2355         case EXPR_BINARY_LESS:
2356         case EXPR_BINARY_LESSEQUAL:
2357         case EXPR_BINARY_GREATER:
2358         case EXPR_BINARY_GREATEREQUAL:
2359                 return handle_assume_compare(dbi, &expression->binary);
2360         default:
2361                 return NULL;
2362         }
2363 }
2364
2365 static ir_node *create_cast(dbg_info *dbgi, ir_node *value_node,
2366                             type_t *from_type, type_t *type)
2367 {
2368         type = skip_typeref(type);
2369         if (type == type_void) {
2370                 /* make sure firm type is constructed */
2371                 (void) get_ir_type(type);
2372                 return NULL;
2373         }
2374         if (!is_type_scalar(type)) {
2375                 /* make sure firm type is constructed */
2376                 (void) get_ir_type(type);
2377                 return value_node;
2378         }
2379
2380         from_type     = skip_typeref(from_type);
2381         ir_mode *mode = get_ir_mode_storage(type);
2382         /* check for conversion from / to __based types */
2383         if (is_type_pointer(type) && is_type_pointer(from_type)) {
2384                 const variable_t *from_var = from_type->pointer.base_variable;
2385                 const variable_t *to_var   = type->pointer.base_variable;
2386                 if (from_var != to_var) {
2387                         if (from_var != NULL) {
2388                                 ir_node *const addr = create_symconst(dbgi, from_var->v.entity);
2389                                 ir_node *const base = deref_address(dbgi, from_var->base.type, addr);
2390                                 value_node = new_d_Add(dbgi, value_node, base, get_ir_mode_storage(from_type));
2391                         }
2392                         if (to_var != NULL) {
2393                                 ir_node *const addr = create_symconst(dbgi, to_var->v.entity);
2394                                 ir_node *const base = deref_address(dbgi, to_var->base.type, addr);
2395                                 value_node = new_d_Sub(dbgi, value_node, base, mode);
2396                         }
2397                 }
2398         }
2399
2400         if (is_type_atomic(type, ATOMIC_TYPE_BOOL)) {
2401                 /* bool adjustments (we save a mode_Bu, but have to temporarily
2402                  * convert to mode_b so we only get a 0/1 value */
2403                 value_node = create_conv(dbgi, value_node, mode_b);
2404         }
2405
2406         ir_mode *mode_arith = get_ir_mode_arithmetic(type);
2407         ir_node *node       = create_conv(dbgi, value_node, mode);
2408         node                = do_strict_conv(dbgi, node);
2409         node                = create_conv(dbgi, node, mode_arith);
2410
2411         return node;
2412 }
2413
2414 static ir_node *unary_expression_to_firm(const unary_expression_t *expression)
2415 {
2416         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2417         type_t   *type = skip_typeref(expression->base.type);
2418
2419         if (expression->base.kind == EXPR_UNARY_TAKE_ADDRESS)
2420                 return expression_to_addr(expression->value);
2421
2422         const expression_t *value = expression->value;
2423
2424         switch(expression->base.kind) {
2425         case EXPR_UNARY_NEGATE: {
2426                 ir_node *value_node = expression_to_firm(value);
2427                 ir_mode *mode       = get_ir_mode_arithmetic(type);
2428                 return new_d_Minus(dbgi, value_node, mode);
2429         }
2430         case EXPR_UNARY_PLUS:
2431                 return expression_to_firm(value);
2432         case EXPR_UNARY_BITWISE_NEGATE: {
2433                 ir_node *value_node = expression_to_firm(value);
2434                 ir_mode *mode       = get_ir_mode_arithmetic(type);
2435                 return new_d_Not(dbgi, value_node, mode);
2436         }
2437         case EXPR_UNARY_NOT: {
2438                 ir_node *value_node = _expression_to_firm(value);
2439                 value_node          = create_conv(dbgi, value_node, mode_b);
2440                 ir_node *res        = new_d_Not(dbgi, value_node, mode_b);
2441                 return res;
2442         }
2443         case EXPR_UNARY_DEREFERENCE: {
2444                 ir_node *value_node = expression_to_firm(value);
2445                 type_t  *value_type = skip_typeref(value->base.type);
2446                 assert(is_type_pointer(value_type));
2447
2448                 /* check for __based */
2449                 const variable_t *const base_var = value_type->pointer.base_variable;
2450                 if (base_var != NULL) {
2451                         ir_node *const addr = create_symconst(dbgi, base_var->v.entity);
2452                         ir_node *const base = deref_address(dbgi, base_var->base.type, addr);
2453                         value_node = new_d_Add(dbgi, value_node, base, get_ir_mode_storage(value_type));
2454                 }
2455                 type_t  *points_to  = value_type->pointer.points_to;
2456                 return deref_address(dbgi, points_to, value_node);
2457         }
2458         case EXPR_UNARY_POSTFIX_INCREMENT:
2459         case EXPR_UNARY_POSTFIX_DECREMENT:
2460         case EXPR_UNARY_PREFIX_INCREMENT:
2461         case EXPR_UNARY_PREFIX_DECREMENT:
2462                 return create_incdec(expression);
2463         case EXPR_UNARY_CAST: {
2464                 ir_node *value_node = expression_to_firm(value);
2465                 type_t  *from_type  = value->base.type;
2466                 return create_cast(dbgi, value_node, from_type, type);
2467         }
2468         case EXPR_UNARY_ASSUME:
2469                 return handle_assume(dbgi, value);
2470
2471         default:
2472                 break;
2473         }
2474         panic("invalid UNEXPR type found");
2475 }
2476
2477 /**
2478  * produces a 0/1 depending of the value of a mode_b node
2479  */
2480 static ir_node *produce_condition_result(const expression_t *expression,
2481                                          ir_mode *mode, dbg_info *dbgi)
2482 {
2483         ir_node *const one_block  = new_immBlock();
2484         ir_node *const zero_block = new_immBlock();
2485         create_condition_evaluation(expression, one_block, zero_block);
2486         mature_immBlock(one_block);
2487         mature_immBlock(zero_block);
2488
2489         ir_node *const jmp_one  = new_rd_Jmp(dbgi, one_block);
2490         ir_node *const jmp_zero = new_rd_Jmp(dbgi, zero_block);
2491         ir_node *const in_cf[2] = { jmp_one, jmp_zero };
2492         ir_node *const block    = new_Block(lengthof(in_cf), in_cf);
2493         set_cur_block(block);
2494
2495         ir_node *const one   = new_Const(get_mode_one(mode));
2496         ir_node *const zero  = new_Const(get_mode_null(mode));
2497         ir_node *const in[2] = { one, zero };
2498         ir_node *const val   = new_d_Phi(dbgi, lengthof(in), in, mode);
2499
2500         return val;
2501 }
2502
2503 static ir_node *adjust_for_pointer_arithmetic(dbg_info *dbgi,
2504                 ir_node *value, type_t *type)
2505 {
2506         ir_mode        *const mode         = get_ir_mode_arithmetic(type_ptrdiff_t);
2507         assert(is_type_pointer(type));
2508         pointer_type_t *const pointer_type = &type->pointer;
2509         type_t         *const points_to    = skip_typeref(pointer_type->points_to);
2510         ir_node        *      elem_size    = get_type_size_node(points_to);
2511         elem_size                          = create_conv(dbgi, elem_size, mode);
2512         value                              = create_conv(dbgi, value,     mode);
2513         ir_node        *const mul          = new_d_Mul(dbgi, value, elem_size, mode);
2514         return mul;
2515 }
2516
2517 static ir_node *create_op(dbg_info *dbgi, const binary_expression_t *expression,
2518                           ir_node *left, ir_node *right)
2519 {
2520         ir_mode  *mode;
2521         type_t   *type_left  = skip_typeref(expression->left->base.type);
2522         type_t   *type_right = skip_typeref(expression->right->base.type);
2523
2524         expression_kind_t kind = expression->base.kind;
2525
2526         switch (kind) {
2527         case EXPR_BINARY_SHIFTLEFT:
2528         case EXPR_BINARY_SHIFTRIGHT:
2529         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2530         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2531                 mode  = get_ir_mode_arithmetic(expression->base.type);
2532                 right = create_conv(dbgi, right, mode_uint);
2533                 break;
2534
2535         case EXPR_BINARY_SUB:
2536                 if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
2537                         const pointer_type_t *const ptr_type = &type_left->pointer;
2538
2539                         mode = get_ir_mode_arithmetic(expression->base.type);
2540                         ir_node *const elem_size = get_type_size_node(ptr_type->points_to);
2541                         ir_node *const conv_size = new_d_Conv(dbgi, elem_size, mode);
2542                         ir_node *const sub       = new_d_Sub(dbgi, left, right, mode);
2543                         ir_node *const no_mem    = new_NoMem();
2544                         ir_node *const div       = new_d_DivRL(dbgi, no_mem, sub, conv_size,
2545                                                                                                    mode, op_pin_state_floats);
2546                         return new_d_Proj(dbgi, div, mode, pn_Div_res);
2547                 }
2548                 /* fallthrough */
2549         case EXPR_BINARY_SUB_ASSIGN:
2550                 if (is_type_pointer(type_left)) {
2551                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2552                         mode  = get_ir_mode_arithmetic(type_left);
2553                         break;
2554                 }
2555                 goto normal_node;
2556
2557         case EXPR_BINARY_ADD:
2558         case EXPR_BINARY_ADD_ASSIGN:
2559                 if (is_type_pointer(type_left)) {
2560                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2561                         mode  = get_ir_mode_arithmetic(type_left);
2562                         break;
2563                 } else if (is_type_pointer(type_right)) {
2564                         left  = adjust_for_pointer_arithmetic(dbgi, left, type_right);
2565                         mode  = get_ir_mode_arithmetic(type_right);
2566                         break;
2567                 }
2568                 goto normal_node;
2569
2570         default:
2571 normal_node:
2572                 mode = get_ir_mode_arithmetic(type_right);
2573                 left = create_conv(dbgi, left, mode);
2574                 break;
2575         }
2576
2577         switch (kind) {
2578         case EXPR_BINARY_ADD_ASSIGN:
2579         case EXPR_BINARY_ADD:
2580                 return new_d_Add(dbgi, left, right, mode);
2581         case EXPR_BINARY_SUB_ASSIGN:
2582         case EXPR_BINARY_SUB:
2583                 return new_d_Sub(dbgi, left, right, mode);
2584         case EXPR_BINARY_MUL_ASSIGN:
2585         case EXPR_BINARY_MUL:
2586                 return new_d_Mul(dbgi, left, right, mode);
2587         case EXPR_BINARY_BITWISE_AND:
2588         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2589                 return new_d_And(dbgi, left, right, mode);
2590         case EXPR_BINARY_BITWISE_OR:
2591         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2592                 return new_d_Or(dbgi, left, right, mode);
2593         case EXPR_BINARY_BITWISE_XOR:
2594         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2595                 return new_d_Eor(dbgi, left, right, mode);
2596         case EXPR_BINARY_SHIFTLEFT:
2597         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2598                 return new_d_Shl(dbgi, left, right, mode);
2599         case EXPR_BINARY_SHIFTRIGHT:
2600         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2601                 if (mode_is_signed(mode)) {
2602                         return new_d_Shrs(dbgi, left, right, mode);
2603                 } else {
2604                         return new_d_Shr(dbgi, left, right, mode);
2605                 }
2606         case EXPR_BINARY_DIV:
2607         case EXPR_BINARY_DIV_ASSIGN: {
2608                 ir_node *pin = new_Pin(new_NoMem());
2609                 ir_node *op  = new_d_Div(dbgi, pin, left, right, mode,
2610                                          op_pin_state_floats);
2611                 ir_node *res = new_d_Proj(dbgi, op, mode, pn_Div_res);
2612                 return res;
2613         }
2614         case EXPR_BINARY_MOD:
2615         case EXPR_BINARY_MOD_ASSIGN: {
2616                 ir_node *pin = new_Pin(new_NoMem());
2617                 assert(!mode_is_float(mode));
2618                 ir_node *op  = new_d_Mod(dbgi, pin, left, right, mode,
2619                                          op_pin_state_floats);
2620                 ir_node *res = new_d_Proj(dbgi, op, mode, pn_Mod_res);
2621                 return res;
2622         }
2623         default:
2624                 panic("unexpected expression kind");
2625         }
2626 }
2627
2628 static ir_node *create_lazy_op(const binary_expression_t *expression)
2629 {
2630         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2631         type_t   *type = skip_typeref(expression->base.type);
2632         ir_mode  *mode = get_ir_mode_arithmetic(type);
2633
2634         if (is_constant_expression(expression->left) == EXPR_CLASS_CONSTANT) {
2635                 bool val = fold_constant_to_bool(expression->left);
2636                 expression_kind_t ekind = expression->base.kind;
2637                 assert(ekind == EXPR_BINARY_LOGICAL_AND || ekind == EXPR_BINARY_LOGICAL_OR);
2638                 if (ekind == EXPR_BINARY_LOGICAL_AND) {
2639                         if (!val) {
2640                                 return new_Const(get_mode_null(mode));
2641                         }
2642                 } else {
2643                         if (val) {
2644                                 return new_Const(get_mode_one(mode));
2645                         }
2646                 }
2647
2648                 if (is_constant_expression(expression->right) == EXPR_CLASS_CONSTANT) {
2649                         bool valr = fold_constant_to_bool(expression->right);
2650                         return create_Const_from_bool(mode, valr);
2651                 }
2652
2653                 return produce_condition_result(expression->right, mode, dbgi);
2654         }
2655
2656         return produce_condition_result((const expression_t*) expression, mode,
2657                                         dbgi);
2658 }
2659
2660 typedef ir_node * (*create_arithmetic_func)(dbg_info *dbgi, ir_node *left,
2661                                             ir_node *right, ir_mode *mode);
2662
2663 static ir_node *create_assign_binop(const binary_expression_t *expression)
2664 {
2665         dbg_info *const     dbgi = get_dbg_info(&expression->base.source_position);
2666         const expression_t *left_expr = expression->left;
2667         type_t             *type      = skip_typeref(left_expr->base.type);
2668         ir_node            *right     = expression_to_firm(expression->right);
2669         ir_node            *left_addr = expression_to_addr(left_expr);
2670         ir_node            *left      = get_value_from_lvalue(left_expr, left_addr);
2671         ir_node            *result    = create_op(dbgi, expression, left, right);
2672
2673         result = create_cast(dbgi, result, expression->right->base.type, type);
2674         result = do_strict_conv(dbgi, result);
2675
2676         result = set_value_for_expression_addr(left_expr, result, left_addr);
2677
2678         if (!is_type_compound(type)) {
2679                 ir_mode *mode_arithmetic = get_ir_mode_arithmetic(type);
2680                 result = create_conv(dbgi, result, mode_arithmetic);
2681         }
2682         return result;
2683 }
2684
2685 static ir_node *binary_expression_to_firm(const binary_expression_t *expression)
2686 {
2687         expression_kind_t kind = expression->base.kind;
2688
2689         switch(kind) {
2690         case EXPR_BINARY_EQUAL:
2691         case EXPR_BINARY_NOTEQUAL:
2692         case EXPR_BINARY_LESS:
2693         case EXPR_BINARY_LESSEQUAL:
2694         case EXPR_BINARY_GREATER:
2695         case EXPR_BINARY_GREATEREQUAL:
2696         case EXPR_BINARY_ISGREATER:
2697         case EXPR_BINARY_ISGREATEREQUAL:
2698         case EXPR_BINARY_ISLESS:
2699         case EXPR_BINARY_ISLESSEQUAL:
2700         case EXPR_BINARY_ISLESSGREATER:
2701         case EXPR_BINARY_ISUNORDERED: {
2702                 dbg_info   *dbgi     = get_dbg_info(&expression->base.source_position);
2703                 ir_node    *left     = expression_to_firm(expression->left);
2704                 ir_node    *right    = expression_to_firm(expression->right);
2705                 ir_relation relation = get_relation(kind);
2706                 ir_node    *cmp      = new_d_Cmp(dbgi, left, right, relation);
2707                 return cmp;
2708         }
2709         case EXPR_BINARY_ASSIGN: {
2710                 ir_node *addr  = expression_to_addr(expression->left);
2711                 ir_node *right = expression_to_firm(expression->right);
2712                 ir_node *res
2713                         = set_value_for_expression_addr(expression->left, right, addr);
2714
2715                 type_t  *type            = skip_typeref(expression->base.type);
2716                 if (!is_type_compound(type)) {
2717                         ir_mode *mode_arithmetic = get_ir_mode_arithmetic(type);
2718                         res                      = create_conv(NULL, res, mode_arithmetic);
2719                 }
2720                 return res;
2721         }
2722         case EXPR_BINARY_ADD:
2723         case EXPR_BINARY_SUB:
2724         case EXPR_BINARY_MUL:
2725         case EXPR_BINARY_DIV:
2726         case EXPR_BINARY_MOD:
2727         case EXPR_BINARY_BITWISE_AND:
2728         case EXPR_BINARY_BITWISE_OR:
2729         case EXPR_BINARY_BITWISE_XOR:
2730         case EXPR_BINARY_SHIFTLEFT:
2731         case EXPR_BINARY_SHIFTRIGHT:
2732         {
2733                 dbg_info *dbgi  = get_dbg_info(&expression->base.source_position);
2734                 ir_node  *left  = expression_to_firm(expression->left);
2735                 ir_node  *right = expression_to_firm(expression->right);
2736                 return create_op(dbgi, expression, left, right);
2737         }
2738         case EXPR_BINARY_LOGICAL_AND:
2739         case EXPR_BINARY_LOGICAL_OR:
2740                 return create_lazy_op(expression);
2741         case EXPR_BINARY_COMMA:
2742                 /* create side effects of left side */
2743                 (void) expression_to_firm(expression->left);
2744                 return _expression_to_firm(expression->right);
2745
2746         case EXPR_BINARY_ADD_ASSIGN:
2747         case EXPR_BINARY_SUB_ASSIGN:
2748         case EXPR_BINARY_MUL_ASSIGN:
2749         case EXPR_BINARY_MOD_ASSIGN:
2750         case EXPR_BINARY_DIV_ASSIGN:
2751         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2752         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2753         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2754         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2755         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2756                 return create_assign_binop(expression);
2757         default:
2758                 panic("TODO binexpr type");
2759         }
2760 }
2761
2762 static ir_node *array_access_addr(const array_access_expression_t *expression)
2763 {
2764         dbg_info *dbgi        = get_dbg_info(&expression->base.source_position);
2765         ir_node  *base_addr   = expression_to_firm(expression->array_ref);
2766         ir_node  *offset      = expression_to_firm(expression->index);
2767         type_t   *ref_type    = skip_typeref(expression->array_ref->base.type);
2768         ir_node  *real_offset = adjust_for_pointer_arithmetic(dbgi, offset, ref_type);
2769         ir_node  *result      = new_d_Add(dbgi, base_addr, real_offset, mode_P_data);
2770
2771         return result;
2772 }
2773
2774 static ir_node *array_access_to_firm(
2775                 const array_access_expression_t *expression)
2776 {
2777         dbg_info *dbgi   = get_dbg_info(&expression->base.source_position);
2778         ir_node  *addr   = array_access_addr(expression);
2779         type_t   *type   = revert_automatic_type_conversion(
2780                         (const expression_t*) expression);
2781         type             = skip_typeref(type);
2782
2783         return deref_address(dbgi, type, addr);
2784 }
2785
2786 static long get_offsetof_offset(const offsetof_expression_t *expression)
2787 {
2788         type_t *orig_type = expression->type;
2789         long    offset    = 0;
2790
2791         designator_t *designator = expression->designator;
2792         for ( ; designator != NULL; designator = designator->next) {
2793                 type_t *type = skip_typeref(orig_type);
2794                 /* be sure the type is constructed */
2795                 (void) get_ir_type(type);
2796
2797                 if (designator->symbol != NULL) {
2798                         assert(is_type_compound(type));
2799                         symbol_t *symbol = designator->symbol;
2800
2801                         compound_t *compound = type->compound.compound;
2802                         entity_t   *iter     = compound->members.entities;
2803                         for ( ; iter != NULL; iter = iter->base.next) {
2804                                 if (iter->base.symbol == symbol) {
2805                                         break;
2806                                 }
2807                         }
2808                         assert(iter != NULL);
2809
2810                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
2811                         assert(iter->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
2812                         offset += get_entity_offset(iter->compound_member.entity);
2813
2814                         orig_type = iter->declaration.type;
2815                 } else {
2816                         expression_t *array_index = designator->array_index;
2817                         assert(designator->array_index != NULL);
2818                         assert(is_type_array(type));
2819
2820                         long index         = fold_constant_to_int(array_index);
2821                         ir_type *arr_type  = get_ir_type(type);
2822                         ir_type *elem_type = get_array_element_type(arr_type);
2823                         long     elem_size = get_type_size_bytes(elem_type);
2824
2825                         offset += index * elem_size;
2826
2827                         orig_type = type->array.element_type;
2828                 }
2829         }
2830
2831         return offset;
2832 }
2833
2834 static ir_node *offsetof_to_firm(const offsetof_expression_t *expression)
2835 {
2836         ir_mode   *mode   = get_ir_mode_arithmetic(expression->base.type);
2837         long       offset = get_offsetof_offset(expression);
2838         ir_tarval *tv     = new_tarval_from_long(offset, mode);
2839         dbg_info  *dbgi   = get_dbg_info(&expression->base.source_position);
2840
2841         return new_d_Const(dbgi, tv);
2842 }
2843
2844 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
2845                                      ir_entity *entity, type_t *type);
2846
2847 static ir_node *compound_literal_to_firm(
2848                 const compound_literal_expression_t *expression)
2849 {
2850         type_t *type = expression->type;
2851
2852         /* create an entity on the stack */
2853         ir_type *frame_type = get_irg_frame_type(current_ir_graph);
2854
2855         ident     *const id     = id_unique("CompLit.%u");
2856         ir_type   *const irtype = get_ir_type(type);
2857         dbg_info  *const dbgi   = get_dbg_info(&expression->base.source_position);
2858         ir_entity *const entity = new_d_entity(frame_type, id, irtype, dbgi);
2859         set_entity_ld_ident(entity, id);
2860
2861         /* create initialisation code */
2862         initializer_t *initializer = expression->initializer;
2863         create_local_initializer(initializer, dbgi, entity, type);
2864
2865         /* create a sel for the compound literal address */
2866         ir_node *frame = get_irg_frame(current_ir_graph);
2867         ir_node *sel   = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
2868         return sel;
2869 }
2870
2871 /**
2872  * Transform a sizeof expression into Firm code.
2873  */
2874 static ir_node *sizeof_to_firm(const typeprop_expression_t *expression)
2875 {
2876         type_t *const type = skip_typeref(expression->type);
2877         /* §6.5.3.4:2 if the type is a VLA, evaluate the expression. */
2878         if (is_type_array(type) && type->array.is_vla
2879                         && expression->tp_expression != NULL) {
2880                 expression_to_firm(expression->tp_expression);
2881         }
2882         /* strange gnu extensions: sizeof(function) == 1 */
2883         if (is_type_function(type)) {
2884                 ir_mode *mode = get_ir_mode_storage(type_size_t);
2885                 return new_Const(get_mode_one(mode));
2886         }
2887
2888         return get_type_size_node(type);
2889 }
2890
2891 static entity_t *get_expression_entity(const expression_t *expression)
2892 {
2893         if (expression->kind != EXPR_REFERENCE)
2894                 return NULL;
2895
2896         return expression->reference.entity;
2897 }
2898
2899 static unsigned get_cparser_entity_alignment(const entity_t *entity)
2900 {
2901         switch(entity->kind) {
2902         DECLARATION_KIND_CASES
2903                 return entity->declaration.alignment;
2904         case ENTITY_STRUCT:
2905         case ENTITY_UNION:
2906                 return entity->compound.alignment;
2907         case ENTITY_TYPEDEF:
2908                 return entity->typedefe.alignment;
2909         default:
2910                 break;
2911         }
2912         return 0;
2913 }
2914
2915 /**
2916  * Transform an alignof expression into Firm code.
2917  */
2918 static ir_node *alignof_to_firm(const typeprop_expression_t *expression)
2919 {
2920         unsigned alignment = 0;
2921
2922         const expression_t *tp_expression = expression->tp_expression;
2923         if (tp_expression != NULL) {
2924                 entity_t *entity = get_expression_entity(tp_expression);
2925                 if (entity != NULL) {
2926                         if (entity->kind == ENTITY_FUNCTION) {
2927                                 /* a gnu-extension */
2928                                 alignment = 1;
2929                         } else {
2930                                 alignment = get_cparser_entity_alignment(entity);
2931                         }
2932                 }
2933         }
2934
2935         if (alignment == 0) {
2936                 type_t *type = expression->type;
2937                 alignment = get_type_alignment(type);
2938         }
2939
2940         dbg_info  *dbgi = get_dbg_info(&expression->base.source_position);
2941         ir_mode   *mode = get_ir_mode_arithmetic(expression->base.type);
2942         ir_tarval *tv   = new_tarval_from_long(alignment, mode);
2943         return new_d_Const(dbgi, tv);
2944 }
2945
2946 static void init_ir_types(void);
2947
2948 static ir_tarval *fold_constant_to_tarval(const expression_t *expression)
2949 {
2950         assert(is_type_valid(skip_typeref(expression->base.type)));
2951
2952         bool constant_folding_old = constant_folding;
2953         constant_folding = true;
2954
2955         init_ir_types();
2956
2957         assert(is_constant_expression(expression) == EXPR_CLASS_CONSTANT);
2958
2959         ir_graph *old_current_ir_graph = current_ir_graph;
2960         current_ir_graph = get_const_code_irg();
2961
2962         ir_node *cnst = expression_to_firm(expression);
2963         current_ir_graph = old_current_ir_graph;
2964
2965         if (!is_Const(cnst)) {
2966                 panic("couldn't fold constant");
2967         }
2968
2969         constant_folding = constant_folding_old;
2970
2971         return get_Const_tarval(cnst);
2972 }
2973
2974 /* this function is only used in parser.c, but it relies on libfirm functionality */
2975 bool constant_is_negative(const expression_t *expression)
2976 {
2977         assert(is_constant_expression(expression) == EXPR_CLASS_CONSTANT);
2978         ir_tarval *tv = fold_constant_to_tarval(expression);
2979         return tarval_is_negative(tv);
2980 }
2981
2982 long fold_constant_to_int(const expression_t *expression)
2983 {
2984         if (expression->kind == EXPR_ERROR)
2985                 return 0;
2986
2987         ir_tarval *tv = fold_constant_to_tarval(expression);
2988         if (!tarval_is_long(tv)) {
2989                 panic("result of constant folding is not integer");
2990         }
2991
2992         return get_tarval_long(tv);
2993 }
2994
2995 bool fold_constant_to_bool(const expression_t *expression)
2996 {
2997         if (expression->kind == EXPR_ERROR)
2998                 return false;
2999         ir_tarval *tv = fold_constant_to_tarval(expression);
3000         return !tarval_is_null(tv);
3001 }
3002
3003 static ir_node *conditional_to_firm(const conditional_expression_t *expression)
3004 {
3005         dbg_info *const dbgi = get_dbg_info(&expression->base.source_position);
3006
3007         /* first try to fold a constant condition */
3008         if (is_constant_expression(expression->condition) == EXPR_CLASS_CONSTANT) {
3009                 bool val = fold_constant_to_bool(expression->condition);
3010                 if (val) {
3011                         expression_t *true_expression = expression->true_expression;
3012                         if (true_expression == NULL)
3013                                 true_expression = expression->condition;
3014                         return expression_to_firm(true_expression);
3015                 } else {
3016                         return expression_to_firm(expression->false_expression);
3017                 }
3018         }
3019
3020         ir_node *const true_block  = new_immBlock();
3021         ir_node *const false_block = new_immBlock();
3022         ir_node *const cond_expr   = create_condition_evaluation(expression->condition, true_block, false_block);
3023         mature_immBlock(true_block);
3024         mature_immBlock(false_block);
3025
3026         set_cur_block(true_block);
3027         ir_node *true_val;
3028         if (expression->true_expression != NULL) {
3029                 true_val = expression_to_firm(expression->true_expression);
3030         } else if (cond_expr != NULL && get_irn_mode(cond_expr) != mode_b) {
3031                 true_val = cond_expr;
3032         } else {
3033                 /* Condition ended with a short circuit (&&, ||, !) operation or a
3034                  * comparison.  Generate a "1" as value for the true branch. */
3035                 true_val = new_Const(get_mode_one(mode_Is));
3036         }
3037         ir_node *const true_jmp = new_d_Jmp(dbgi);
3038
3039         set_cur_block(false_block);
3040         ir_node *const false_val = expression_to_firm(expression->false_expression);
3041         ir_node *const false_jmp = new_d_Jmp(dbgi);
3042
3043         /* create the common block */
3044         ir_node *const in_cf[2] = { true_jmp, false_jmp };
3045         ir_node *const block    = new_Block(lengthof(in_cf), in_cf);
3046         set_cur_block(block);
3047
3048         /* TODO improve static semantics, so either both or no values are NULL */
3049         if (true_val == NULL || false_val == NULL)
3050                 return NULL;
3051
3052         ir_node *const in[2] = { true_val, false_val };
3053         type_t  *const type  = skip_typeref(expression->base.type);
3054         ir_mode *mode;
3055         if (is_type_compound(type)) {
3056                 mode = mode_P;
3057         } else {
3058                 mode = get_ir_mode_arithmetic(type);
3059         }
3060         ir_node *const val   = new_d_Phi(dbgi, lengthof(in), in, mode);
3061
3062         return val;
3063 }
3064
3065 /**
3066  * Returns an IR-node representing the address of a field.
3067  */
3068 static ir_node *select_addr(const select_expression_t *expression)
3069 {
3070         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3071
3072         construct_select_compound(expression);
3073
3074         ir_node *compound_addr = expression_to_firm(expression->compound);
3075
3076         entity_t *entry = expression->compound_entry;
3077         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3078         assert(entry->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
3079
3080         if (constant_folding) {
3081                 ir_mode *mode = get_irn_mode(compound_addr);
3082                 /* FIXME: here, we need an integer mode with the same number of bits as mode */
3083                 ir_node *ofs  = new_Const_long(mode_uint, entry->compound_member.offset);
3084                 return new_d_Add(dbgi, compound_addr, ofs, mode);
3085         } else {
3086                 ir_entity *irentity = entry->compound_member.entity;
3087                 assert(irentity != NULL);
3088                 return new_d_simpleSel(dbgi, new_NoMem(), compound_addr, irentity);
3089         }
3090 }
3091
3092 static ir_node *select_to_firm(const select_expression_t *expression)
3093 {
3094         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3095         ir_node  *addr = select_addr(expression);
3096         type_t   *type = revert_automatic_type_conversion(
3097                         (const expression_t*) expression);
3098         type           = skip_typeref(type);
3099
3100         entity_t *entry = expression->compound_entry;
3101         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3102
3103         if (entry->compound_member.bitfield) {
3104                 return bitfield_extract_to_firm(expression, addr);
3105         }
3106
3107         return deref_address(dbgi, type, addr);
3108 }
3109
3110 /* Values returned by __builtin_classify_type. */
3111 typedef enum gcc_type_class
3112 {
3113         no_type_class = -1,
3114         void_type_class,
3115         integer_type_class,
3116         char_type_class,
3117         enumeral_type_class,
3118         boolean_type_class,
3119         pointer_type_class,
3120         reference_type_class,
3121         offset_type_class,
3122         real_type_class,
3123         complex_type_class,
3124         function_type_class,
3125         method_type_class,
3126         record_type_class,
3127         union_type_class,
3128         array_type_class,
3129         string_type_class,
3130         set_type_class,
3131         file_type_class,
3132         lang_type_class
3133 } gcc_type_class;
3134
3135 static ir_node *classify_type_to_firm(const classify_type_expression_t *const expr)
3136 {
3137         type_t *type = expr->type_expression->base.type;
3138
3139         /* FIXME gcc returns different values depending on whether compiling C or C++
3140          * e.g. int x[10] is pointer_type_class in C, but array_type_class in C++ */
3141         gcc_type_class tc;
3142         for (;;) {
3143                 type = skip_typeref(type);
3144                 switch (type->kind) {
3145                         case TYPE_ATOMIC: {
3146                                 const atomic_type_t *const atomic_type = &type->atomic;
3147                                 switch (atomic_type->akind) {
3148                                         /* should not be reached */
3149                                         case ATOMIC_TYPE_INVALID:
3150                                                 tc = no_type_class;
3151                                                 goto make_const;
3152
3153                                         /* gcc cannot do that */
3154                                         case ATOMIC_TYPE_VOID:
3155                                                 tc = void_type_class;
3156                                                 goto make_const;
3157
3158                                         case ATOMIC_TYPE_WCHAR_T:   /* gcc handles this as integer */
3159                                         case ATOMIC_TYPE_CHAR:      /* gcc handles this as integer */
3160                                         case ATOMIC_TYPE_SCHAR:     /* gcc handles this as integer */
3161                                         case ATOMIC_TYPE_UCHAR:     /* gcc handles this as integer */
3162                                         case ATOMIC_TYPE_SHORT:
3163                                         case ATOMIC_TYPE_USHORT:
3164                                         case ATOMIC_TYPE_INT:
3165                                         case ATOMIC_TYPE_UINT:
3166                                         case ATOMIC_TYPE_LONG:
3167                                         case ATOMIC_TYPE_ULONG:
3168                                         case ATOMIC_TYPE_LONGLONG:
3169                                         case ATOMIC_TYPE_ULONGLONG:
3170                                         case ATOMIC_TYPE_BOOL:      /* gcc handles this as integer */
3171                                                 tc = integer_type_class;
3172                                                 goto make_const;
3173
3174                                         case ATOMIC_TYPE_FLOAT:
3175                                         case ATOMIC_TYPE_DOUBLE:
3176                                         case ATOMIC_TYPE_LONG_DOUBLE:
3177                                                 tc = real_type_class;
3178                                                 goto make_const;
3179                                 }
3180                                 panic("Unexpected atomic type in classify_type_to_firm().");
3181                         }
3182
3183                         case TYPE_COMPLEX:         tc = complex_type_class; goto make_const;
3184                         case TYPE_IMAGINARY:       tc = complex_type_class; goto make_const;
3185                         case TYPE_ARRAY:           /* gcc handles this as pointer */
3186                         case TYPE_FUNCTION:        /* gcc handles this as pointer */
3187                         case TYPE_POINTER:         tc = pointer_type_class; goto make_const;
3188                         case TYPE_COMPOUND_STRUCT: tc = record_type_class;  goto make_const;
3189                         case TYPE_COMPOUND_UNION:  tc = union_type_class;   goto make_const;
3190
3191                         /* gcc handles this as integer */
3192                         case TYPE_ENUM:            tc = integer_type_class; goto make_const;
3193
3194                         /* gcc classifies the referenced type */
3195                         case TYPE_REFERENCE: type = type->reference.refers_to; continue;
3196
3197                         /* typedef/typeof should be skipped already */
3198                         case TYPE_TYPEDEF:
3199                         case TYPE_TYPEOF:
3200                         case TYPE_ERROR:
3201                                 break;
3202                 }
3203                 panic("unexpected TYPE classify_type_to_firm().");
3204         }
3205
3206 make_const:;
3207         dbg_info  *const dbgi = get_dbg_info(&expr->base.source_position);
3208         ir_tarval *const tv   = new_tarval_from_long(tc, mode_int);
3209         return new_d_Const(dbgi, tv);
3210 }
3211
3212 static ir_node *function_name_to_firm(
3213                 const funcname_expression_t *const expr)
3214 {
3215         switch(expr->kind) {
3216         case FUNCNAME_FUNCTION:
3217         case FUNCNAME_PRETTY_FUNCTION:
3218         case FUNCNAME_FUNCDNAME:
3219                 if (current_function_name == NULL) {
3220                         const source_position_t *const src_pos = &expr->base.source_position;
3221                         const char    *name  = current_function_entity->base.symbol->string;
3222                         const string_t string = { name, strlen(name) + 1 };
3223                         current_function_name = string_to_firm(src_pos, "__func__.%u", &string);
3224                 }
3225                 return current_function_name;
3226         case FUNCNAME_FUNCSIG:
3227                 if (current_funcsig == NULL) {
3228                         const source_position_t *const src_pos = &expr->base.source_position;
3229                         ir_entity *ent = get_irg_entity(current_ir_graph);
3230                         const char *const name = get_entity_ld_name(ent);
3231                         const string_t string = { name, strlen(name) + 1 };
3232                         current_funcsig = string_to_firm(src_pos, "__FUNCSIG__.%u", &string);
3233                 }
3234                 return current_funcsig;
3235         }
3236         panic("Unsupported function name");
3237 }
3238
3239 static ir_node *statement_expression_to_firm(const statement_expression_t *expr)
3240 {
3241         statement_t *statement = expr->statement;
3242
3243         assert(statement->kind == STATEMENT_COMPOUND);
3244         return compound_statement_to_firm(&statement->compound);
3245 }
3246
3247 static ir_node *va_start_expression_to_firm(
3248         const va_start_expression_t *const expr)
3249 {
3250         ir_entity *param_ent = current_vararg_entity;
3251         if (param_ent == NULL) {
3252                 size_t   const n           = IR_VA_START_PARAMETER_NUMBER;
3253                 ir_type *const frame_type  = get_irg_frame_type(current_ir_graph);
3254                 ir_type *const param_type  = get_unknown_type();
3255                 param_ent = new_parameter_entity(frame_type, n, param_type);
3256                 current_vararg_entity = param_ent;
3257         }
3258
3259         ir_node  *const frame   = get_irg_frame(current_ir_graph);
3260         dbg_info *const dbgi    = get_dbg_info(&expr->base.source_position);
3261         ir_node  *const no_mem  = new_NoMem();
3262         ir_node  *const arg_sel = new_d_simpleSel(dbgi, no_mem, frame, param_ent);
3263
3264         set_value_for_expression(expr->ap, arg_sel);
3265
3266         return NULL;
3267 }
3268
3269 static ir_node *va_arg_expression_to_firm(const va_arg_expression_t *const expr)
3270 {
3271         type_t       *const type    = expr->base.type;
3272         expression_t *const ap_expr = expr->ap;
3273         ir_node      *const ap_addr = expression_to_addr(ap_expr);
3274         ir_node      *const ap      = get_value_from_lvalue(ap_expr, ap_addr);
3275         dbg_info     *const dbgi    = get_dbg_info(&expr->base.source_position);
3276         ir_node      *const res     = deref_address(dbgi, type, ap);
3277
3278         ir_node      *const cnst    = get_type_size_node(expr->base.type);
3279         ir_mode      *const mode    = get_irn_mode(cnst);
3280         ir_node      *const c1      = new_Const_long(mode, stack_param_align - 1);
3281         ir_node      *const c2      = new_d_Add(dbgi, cnst, c1, mode);
3282         ir_node      *const c3      = new_Const_long(mode, -(long)stack_param_align);
3283         ir_node      *const c4      = new_d_And(dbgi, c2, c3, mode);
3284         ir_node      *const add     = new_d_Add(dbgi, ap, c4, mode_P_data);
3285
3286         set_value_for_expression_addr(ap_expr, add, ap_addr);
3287
3288         return res;
3289 }
3290
3291 /**
3292  * Generate Firm for a va_copy expression.
3293  */
3294 static ir_node *va_copy_expression_to_firm(const va_copy_expression_t *const expr)
3295 {
3296         ir_node *const src = expression_to_firm(expr->src);
3297         set_value_for_expression(expr->dst, src);
3298         return NULL;
3299 }
3300
3301 static ir_node *dereference_addr(const unary_expression_t *const expression)
3302 {
3303         assert(expression->base.kind == EXPR_UNARY_DEREFERENCE);
3304         return expression_to_firm(expression->value);
3305 }
3306
3307 /**
3308  * Returns a IR-node representing an lvalue of the given expression.
3309  */
3310 static ir_node *expression_to_addr(const expression_t *expression)
3311 {
3312         switch(expression->kind) {
3313         case EXPR_ARRAY_ACCESS:
3314                 return array_access_addr(&expression->array_access);
3315         case EXPR_CALL:
3316                 return call_expression_to_firm(&expression->call);
3317         case EXPR_COMPOUND_LITERAL:
3318                 return compound_literal_to_firm(&expression->compound_literal);
3319         case EXPR_REFERENCE:
3320                 return reference_addr(&expression->reference);
3321         case EXPR_SELECT:
3322                 return select_addr(&expression->select);
3323         case EXPR_UNARY_DEREFERENCE:
3324                 return dereference_addr(&expression->unary);
3325         default:
3326                 break;
3327         }
3328         panic("trying to get address of non-lvalue");
3329 }
3330
3331 static ir_node *builtin_constant_to_firm(
3332                 const builtin_constant_expression_t *expression)
3333 {
3334         ir_mode *const mode = get_ir_mode_arithmetic(expression->base.type);
3335         bool     const v    = is_constant_expression(expression->value) == EXPR_CLASS_CONSTANT;
3336         return create_Const_from_bool(mode, v);
3337 }
3338
3339 static ir_node *builtin_types_compatible_to_firm(
3340                 const builtin_types_compatible_expression_t *expression)
3341 {
3342         type_t  *const left  = get_unqualified_type(skip_typeref(expression->left));
3343         type_t  *const right = get_unqualified_type(skip_typeref(expression->right));
3344         bool     const value = types_compatible(left, right);
3345         ir_mode *const mode  = get_ir_mode_arithmetic(expression->base.type);
3346         return create_Const_from_bool(mode, value);
3347 }
3348
3349 static ir_node *get_label_block(label_t *label)
3350 {
3351         if (label->block != NULL)
3352                 return label->block;
3353
3354         /* beware: might be called from create initializer with current_ir_graph
3355          * set to const_code_irg. */
3356         ir_graph *rem    = current_ir_graph;
3357         current_ir_graph = current_function;
3358
3359         ir_node *block = new_immBlock();
3360
3361         label->block = block;
3362
3363         ARR_APP1(label_t *, all_labels, label);
3364
3365         current_ir_graph = rem;
3366         return block;
3367 }
3368
3369 /**
3370  * Pointer to a label.  This is used for the
3371  * GNU address-of-label extension.
3372  */
3373 static ir_node *label_address_to_firm(const label_address_expression_t *label)
3374 {
3375         dbg_info  *dbgi   = get_dbg_info(&label->base.source_position);
3376         ir_node   *block  = get_label_block(label->label);
3377         ir_entity *entity = create_Block_entity(block);
3378
3379         symconst_symbol value;
3380         value.entity_p = entity;
3381         return new_d_SymConst(dbgi, mode_P_code, value, symconst_addr_ent);
3382 }
3383
3384 static ir_node *error_to_firm(const expression_t *expression)
3385 {
3386         ir_mode *mode = get_ir_mode_arithmetic(expression->base.type);
3387         return new_Bad(mode);
3388 }
3389
3390 /**
3391  * creates firm nodes for an expression. The difference between this function
3392  * and expression_to_firm is, that this version might produce mode_b nodes
3393  * instead of mode_Is.
3394  */
3395 static ir_node *_expression_to_firm(const expression_t *expression)
3396 {
3397 #ifndef NDEBUG
3398         if (!constant_folding) {
3399                 assert(!expression->base.transformed);
3400                 ((expression_t*) expression)->base.transformed = true;
3401         }
3402 #endif
3403
3404         switch (expression->kind) {
3405         EXPR_LITERAL_CASES
3406                 return literal_to_firm(&expression->literal);
3407         case EXPR_STRING_LITERAL:
3408                 return string_to_firm(&expression->base.source_position, "str.%u",
3409                                       &expression->literal.value);
3410         case EXPR_WIDE_STRING_LITERAL:
3411                 return wide_string_literal_to_firm(&expression->string_literal);
3412         case EXPR_REFERENCE:
3413                 return reference_expression_to_firm(&expression->reference);
3414         case EXPR_REFERENCE_ENUM_VALUE:
3415                 return reference_expression_enum_value_to_firm(&expression->reference);
3416         case EXPR_CALL:
3417                 return call_expression_to_firm(&expression->call);
3418         EXPR_UNARY_CASES
3419                 return unary_expression_to_firm(&expression->unary);
3420         EXPR_BINARY_CASES
3421                 return binary_expression_to_firm(&expression->binary);
3422         case EXPR_ARRAY_ACCESS:
3423                 return array_access_to_firm(&expression->array_access);
3424         case EXPR_SIZEOF:
3425                 return sizeof_to_firm(&expression->typeprop);
3426         case EXPR_ALIGNOF:
3427                 return alignof_to_firm(&expression->typeprop);
3428         case EXPR_CONDITIONAL:
3429                 return conditional_to_firm(&expression->conditional);
3430         case EXPR_SELECT:
3431                 return select_to_firm(&expression->select);
3432         case EXPR_CLASSIFY_TYPE:
3433                 return classify_type_to_firm(&expression->classify_type);
3434         case EXPR_FUNCNAME:
3435                 return function_name_to_firm(&expression->funcname);
3436         case EXPR_STATEMENT:
3437                 return statement_expression_to_firm(&expression->statement);
3438         case EXPR_VA_START:
3439                 return va_start_expression_to_firm(&expression->va_starte);
3440         case EXPR_VA_ARG:
3441                 return va_arg_expression_to_firm(&expression->va_arge);
3442         case EXPR_VA_COPY:
3443                 return va_copy_expression_to_firm(&expression->va_copye);
3444         case EXPR_BUILTIN_CONSTANT_P:
3445                 return builtin_constant_to_firm(&expression->builtin_constant);
3446         case EXPR_BUILTIN_TYPES_COMPATIBLE_P:
3447                 return builtin_types_compatible_to_firm(&expression->builtin_types_compatible);
3448         case EXPR_OFFSETOF:
3449                 return offsetof_to_firm(&expression->offsetofe);
3450         case EXPR_COMPOUND_LITERAL:
3451                 return compound_literal_to_firm(&expression->compound_literal);
3452         case EXPR_LABEL_ADDRESS:
3453                 return label_address_to_firm(&expression->label_address);
3454
3455         case EXPR_ERROR:
3456                 return error_to_firm(expression);
3457         }
3458         panic("invalid expression found");
3459 }
3460
3461 /**
3462  * Check if a given expression is a GNU __builtin_expect() call.
3463  */
3464 static bool is_builtin_expect(const expression_t *expression)
3465 {
3466         if (expression->kind != EXPR_CALL)
3467                 return false;
3468
3469         expression_t *function = expression->call.function;
3470         if (function->kind != EXPR_REFERENCE)
3471                 return false;
3472         reference_expression_t *ref = &function->reference;
3473         if (ref->entity->kind         != ENTITY_FUNCTION ||
3474             ref->entity->function.btk != BUILTIN_EXPECT)
3475                 return false;
3476
3477         return true;
3478 }
3479
3480 static bool produces_mode_b(const expression_t *expression)
3481 {
3482         switch (expression->kind) {
3483         case EXPR_BINARY_EQUAL:
3484         case EXPR_BINARY_NOTEQUAL:
3485         case EXPR_BINARY_LESS:
3486         case EXPR_BINARY_LESSEQUAL:
3487         case EXPR_BINARY_GREATER:
3488         case EXPR_BINARY_GREATEREQUAL:
3489         case EXPR_BINARY_ISGREATER:
3490         case EXPR_BINARY_ISGREATEREQUAL:
3491         case EXPR_BINARY_ISLESS:
3492         case EXPR_BINARY_ISLESSEQUAL:
3493         case EXPR_BINARY_ISLESSGREATER:
3494         case EXPR_BINARY_ISUNORDERED:
3495         case EXPR_UNARY_NOT:
3496                 return true;
3497
3498         case EXPR_CALL:
3499                 if (is_builtin_expect(expression)) {
3500                         expression_t *argument = expression->call.arguments->expression;
3501                         return produces_mode_b(argument);
3502                 }
3503                 return false;
3504         case EXPR_BINARY_COMMA:
3505                 return produces_mode_b(expression->binary.right);
3506
3507         default:
3508                 return false;
3509         }
3510 }
3511
3512 static ir_node *expression_to_firm(const expression_t *expression)
3513 {
3514         if (!produces_mode_b(expression)) {
3515                 ir_node *res = _expression_to_firm(expression);
3516                 assert(res == NULL || get_irn_mode(res) != mode_b);
3517                 return res;
3518         }
3519
3520         if (is_constant_expression(expression) == EXPR_CLASS_CONSTANT) {
3521                 bool const constant_folding_old = constant_folding;
3522                 constant_folding = true;
3523                 ir_node *res  = _expression_to_firm(expression);
3524                 constant_folding = constant_folding_old;
3525                 ir_mode *mode = get_ir_mode_arithmetic(expression->base.type);
3526                 assert(is_Const(res));
3527                 return create_Const_from_bool(mode, !is_Const_null(res));
3528         }
3529
3530         /* we have to produce a 0/1 from the mode_b expression */
3531         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3532         ir_mode  *mode = get_ir_mode_arithmetic(expression->base.type);
3533         return produce_condition_result(expression, mode, dbgi);
3534 }
3535
3536 /**
3537  * create a short-circuit expression evaluation that tries to construct
3538  * efficient control flow structures for &&, || and ! expressions
3539  */
3540 static ir_node *create_condition_evaluation(const expression_t *expression,
3541                                             ir_node *true_block,
3542                                             ir_node *false_block)
3543 {
3544         switch(expression->kind) {
3545         case EXPR_UNARY_NOT: {
3546                 const unary_expression_t *unary_expression = &expression->unary;
3547                 create_condition_evaluation(unary_expression->value, false_block,
3548                                             true_block);
3549                 return NULL;
3550         }
3551         case EXPR_BINARY_LOGICAL_AND: {
3552                 const binary_expression_t *binary_expression = &expression->binary;
3553
3554                 ir_node *extra_block = new_immBlock();
3555                 create_condition_evaluation(binary_expression->left, extra_block,
3556                                             false_block);
3557                 mature_immBlock(extra_block);
3558                 set_cur_block(extra_block);
3559                 create_condition_evaluation(binary_expression->right, true_block,
3560                                             false_block);
3561                 return NULL;
3562         }
3563         case EXPR_BINARY_LOGICAL_OR: {
3564                 const binary_expression_t *binary_expression = &expression->binary;
3565
3566                 ir_node *extra_block = new_immBlock();
3567                 create_condition_evaluation(binary_expression->left, true_block,
3568                                             extra_block);
3569                 mature_immBlock(extra_block);
3570                 set_cur_block(extra_block);
3571                 create_condition_evaluation(binary_expression->right, true_block,
3572                                             false_block);
3573                 return NULL;
3574         }
3575         default:
3576                 break;
3577         }
3578
3579         dbg_info *dbgi       = get_dbg_info(&expression->base.source_position);
3580         ir_node  *cond_expr  = _expression_to_firm(expression);
3581         ir_node  *condition  = create_conv(dbgi, cond_expr, mode_b);
3582         ir_node  *cond       = new_d_Cond(dbgi, condition);
3583         ir_node  *true_proj  = new_d_Proj(dbgi, cond, mode_X, pn_Cond_true);
3584         ir_node  *false_proj = new_d_Proj(dbgi, cond, mode_X, pn_Cond_false);
3585
3586         /* set branch prediction info based on __builtin_expect */
3587         if (is_builtin_expect(expression) && is_Cond(cond)) {
3588                 call_argument_t *argument = expression->call.arguments->next;
3589                 if (is_constant_expression(argument->expression) == EXPR_CLASS_CONSTANT) {
3590                         bool               const cnst = fold_constant_to_bool(argument->expression);
3591                         cond_jmp_predicate const pred = cnst ? COND_JMP_PRED_TRUE : COND_JMP_PRED_FALSE;
3592                         set_Cond_jmp_pred(cond, pred);
3593                 }
3594         }
3595
3596         add_immBlock_pred(true_block, true_proj);
3597         add_immBlock_pred(false_block, false_proj);
3598
3599         set_unreachable_now();
3600         return cond_expr;
3601 }
3602
3603 static void create_variable_entity(entity_t *variable,
3604                                    declaration_kind_t declaration_kind,
3605                                    ir_type *parent_type)
3606 {
3607         assert(variable->kind == ENTITY_VARIABLE);
3608         type_t    *type = skip_typeref(variable->declaration.type);
3609
3610         ident     *const id        = new_id_from_str(variable->base.symbol->string);
3611         ir_type   *const irtype    = get_ir_type(type);
3612         dbg_info  *const dbgi      = get_dbg_info(&variable->base.source_position);
3613         ir_entity *const irentity  = new_d_entity(parent_type, id, irtype, dbgi);
3614         unsigned         alignment = variable->declaration.alignment;
3615
3616         set_entity_alignment(irentity, alignment);
3617
3618         handle_decl_modifiers(irentity, variable);
3619
3620         variable->declaration.kind  = (unsigned char) declaration_kind;
3621         variable->variable.v.entity = irentity;
3622         set_entity_ld_ident(irentity, create_ld_ident(variable));
3623
3624         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
3625                 set_entity_volatility(irentity, volatility_is_volatile);
3626         }
3627 }
3628
3629
3630 typedef struct type_path_entry_t type_path_entry_t;
3631 struct type_path_entry_t {
3632         type_t           *type;
3633         ir_initializer_t *initializer;
3634         size_t            index;
3635         entity_t         *compound_entry;
3636 };
3637
3638 typedef struct type_path_t type_path_t;
3639 struct type_path_t {
3640         type_path_entry_t *path;
3641         type_t            *top_type;
3642         bool               invalid;
3643 };
3644
3645 static __attribute__((unused)) void debug_print_type_path(const type_path_t *path)
3646 {
3647         size_t len = ARR_LEN(path->path);
3648
3649         for (size_t i = 0; i < len; ++i) {
3650                 const type_path_entry_t *entry = & path->path[i];
3651
3652                 type_t *type = skip_typeref(entry->type);
3653                 if (is_type_compound(type)) {
3654                         fprintf(stderr, ".%s", entry->compound_entry->base.symbol->string);
3655                 } else if (is_type_array(type)) {
3656                         fprintf(stderr, "[%u]", (unsigned) entry->index);
3657                 } else {
3658                         fprintf(stderr, "-INVALID-");
3659                 }
3660         }
3661         fprintf(stderr, "  (");
3662         print_type(path->top_type);
3663         fprintf(stderr, ")");
3664 }
3665
3666 static type_path_entry_t *get_type_path_top(const type_path_t *path)
3667 {
3668         size_t len = ARR_LEN(path->path);
3669         assert(len > 0);
3670         return & path->path[len-1];
3671 }
3672
3673 static type_path_entry_t *append_to_type_path(type_path_t *path)
3674 {
3675         size_t len = ARR_LEN(path->path);
3676         ARR_RESIZE(type_path_entry_t, path->path, len+1);
3677
3678         type_path_entry_t *result = & path->path[len];
3679         memset(result, 0, sizeof(result[0]));
3680         return result;
3681 }
3682
3683 static size_t get_compound_member_count(const compound_type_t *type)
3684 {
3685         compound_t *compound  = type->compound;
3686         size_t      n_members = 0;
3687         entity_t   *member    = compound->members.entities;
3688         for ( ; member != NULL; member = member->base.next) {
3689                 ++n_members;
3690         }
3691
3692         return n_members;
3693 }
3694
3695 static ir_initializer_t *get_initializer_entry(type_path_t *path)
3696 {
3697         type_t *orig_top_type = path->top_type;
3698         type_t *top_type      = skip_typeref(orig_top_type);
3699
3700         assert(is_type_compound(top_type) || is_type_array(top_type));
3701
3702         if (ARR_LEN(path->path) == 0) {
3703                 return NULL;
3704         } else {
3705                 type_path_entry_t *top         = get_type_path_top(path);
3706                 ir_initializer_t  *initializer = top->initializer;
3707                 return get_initializer_compound_value(initializer, top->index);
3708         }
3709 }
3710
3711 static void descend_into_subtype(type_path_t *path)
3712 {
3713         type_t *orig_top_type = path->top_type;
3714         type_t *top_type      = skip_typeref(orig_top_type);
3715
3716         assert(is_type_compound(top_type) || is_type_array(top_type));
3717
3718         ir_initializer_t *initializer = get_initializer_entry(path);
3719
3720         type_path_entry_t *top = append_to_type_path(path);
3721         top->type              = top_type;
3722
3723         size_t len;
3724
3725         if (is_type_compound(top_type)) {
3726                 compound_t *const compound = top_type->compound.compound;
3727                 entity_t   *const entry    = skip_unnamed_bitfields(compound->members.entities);
3728
3729                 top->compound_entry = entry;
3730                 top->index          = 0;
3731                 len                 = get_compound_member_count(&top_type->compound);
3732                 if (entry != NULL) {
3733                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3734                         path->top_type = entry->declaration.type;
3735                 }
3736         } else {
3737                 assert(is_type_array(top_type));
3738                 assert(top_type->array.size > 0);
3739
3740                 top->index     = 0;
3741                 path->top_type = top_type->array.element_type;
3742                 len            = top_type->array.size;
3743         }
3744         if (initializer == NULL
3745                         || get_initializer_kind(initializer) == IR_INITIALIZER_NULL) {
3746                 initializer = create_initializer_compound(len);
3747                 /* we have to set the entry at the 2nd latest path entry... */
3748                 size_t path_len = ARR_LEN(path->path);
3749                 assert(path_len >= 1);
3750                 if (path_len > 1) {
3751                         type_path_entry_t *entry        = & path->path[path_len-2];
3752                         ir_initializer_t  *tinitializer = entry->initializer;
3753                         set_initializer_compound_value(tinitializer, entry->index,
3754                                                        initializer);
3755                 }
3756         }
3757         top->initializer = initializer;
3758 }
3759
3760 static void ascend_from_subtype(type_path_t *path)
3761 {
3762         type_path_entry_t *top = get_type_path_top(path);
3763
3764         path->top_type = top->type;
3765
3766         size_t len = ARR_LEN(path->path);
3767         ARR_RESIZE(type_path_entry_t, path->path, len-1);
3768 }
3769
3770 static void walk_designator(type_path_t *path, const designator_t *designator)
3771 {
3772         /* designators start at current object type */
3773         ARR_RESIZE(type_path_entry_t, path->path, 1);
3774
3775         for ( ; designator != NULL; designator = designator->next) {
3776                 type_path_entry_t *top         = get_type_path_top(path);
3777                 type_t            *orig_type   = top->type;
3778                 type_t            *type        = skip_typeref(orig_type);
3779
3780                 if (designator->symbol != NULL) {
3781                         assert(is_type_compound(type));
3782                         size_t    index  = 0;
3783                         symbol_t *symbol = designator->symbol;
3784
3785                         compound_t *compound = type->compound.compound;
3786                         entity_t   *iter     = compound->members.entities;
3787                         for ( ; iter != NULL; iter = iter->base.next, ++index) {
3788                                 if (iter->base.symbol == symbol) {
3789                                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
3790                                         break;
3791                                 }
3792                         }
3793                         assert(iter != NULL);
3794
3795                         /* revert previous initialisations of other union elements */
3796                         if (type->kind == TYPE_COMPOUND_UNION) {
3797                                 ir_initializer_t *initializer = top->initializer;
3798                                 if (initializer != NULL
3799                                         && get_initializer_kind(initializer) == IR_INITIALIZER_COMPOUND) {
3800                                         /* are we writing to a new element? */
3801                                         ir_initializer_t *oldi
3802                                                 = get_initializer_compound_value(initializer, index);
3803                                         if (get_initializer_kind(oldi) == IR_INITIALIZER_NULL) {
3804                                                 /* clear initializer */
3805                                                 size_t len
3806                                                         = get_initializer_compound_n_entries(initializer);
3807                                                 ir_initializer_t *nulli = get_initializer_null();
3808                                                 for (size_t i = 0; i < len; ++i) {
3809                                                         set_initializer_compound_value(initializer, i,
3810                                                                                        nulli);
3811                                                 }
3812                                         }
3813                                 }
3814                         }
3815
3816                         top->type           = orig_type;
3817                         top->compound_entry = iter;
3818                         top->index          = index;
3819                         orig_type           = iter->declaration.type;
3820                 } else {
3821                         expression_t *array_index = designator->array_index;
3822                         assert(designator->array_index != NULL);
3823                         assert(is_type_array(type));
3824
3825                         long index = fold_constant_to_int(array_index);
3826                         assert(index >= 0);
3827 #ifndef NDEBUG
3828                         if (type->array.size_constant) {
3829                                 long array_size = type->array.size;
3830                                 assert(index < array_size);
3831                         }
3832 #endif
3833
3834                         top->type  = orig_type;
3835                         top->index = (size_t) index;
3836                         orig_type  = type->array.element_type;
3837                 }
3838                 path->top_type = orig_type;
3839
3840                 if (designator->next != NULL) {
3841                         descend_into_subtype(path);
3842                 }
3843         }
3844
3845         path->invalid  = false;
3846 }
3847
3848 static void advance_current_object(type_path_t *path)
3849 {
3850         if (path->invalid) {
3851                 /* TODO: handle this... */
3852                 panic("invalid initializer in ast2firm (excessive elements)");
3853         }
3854
3855         type_path_entry_t *top = get_type_path_top(path);
3856
3857         type_t *type = skip_typeref(top->type);
3858         if (is_type_union(type)) {
3859                 /* only the first element is initialized in unions */
3860                 top->compound_entry = NULL;
3861         } else if (is_type_struct(type)) {
3862                 entity_t *entry = top->compound_entry;
3863
3864                 top->index++;
3865                 entry               = skip_unnamed_bitfields(entry->base.next);
3866                 top->compound_entry = entry;
3867                 if (entry != NULL) {
3868                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3869                         path->top_type = entry->declaration.type;
3870                         return;
3871                 }
3872         } else {
3873                 assert(is_type_array(type));
3874
3875                 top->index++;
3876                 if (!type->array.size_constant || top->index < type->array.size) {
3877                         return;
3878                 }
3879         }
3880
3881         /* we're past the last member of the current sub-aggregate, try if we
3882          * can ascend in the type hierarchy and continue with another subobject */
3883         size_t len = ARR_LEN(path->path);
3884
3885         if (len > 1) {
3886                 ascend_from_subtype(path);
3887                 advance_current_object(path);
3888         } else {
3889                 path->invalid = true;
3890         }
3891 }
3892
3893
3894 static ir_initializer_t *create_ir_initializer(
3895                 const initializer_t *initializer, type_t *type);
3896
3897 static ir_initializer_t *create_ir_initializer_value(
3898                 const initializer_value_t *initializer)
3899 {
3900         if (is_type_compound(initializer->value->base.type)) {
3901                 panic("initializer creation for compounds not implemented yet");
3902         }
3903         type_t       *type = initializer->value->base.type;
3904         expression_t *expr = initializer->value;
3905         ir_node *value = expression_to_firm(expr);
3906         ir_mode *mode  = get_ir_mode_storage(type);
3907         value          = create_conv(NULL, value, mode);
3908         return create_initializer_const(value);
3909 }
3910
3911 /** test wether type can be initialized by a string constant */
3912 static bool is_string_type(type_t *type)
3913 {
3914         type_t *inner;
3915         if (is_type_pointer(type)) {
3916                 inner = skip_typeref(type->pointer.points_to);
3917         } else if(is_type_array(type)) {
3918                 inner = skip_typeref(type->array.element_type);
3919         } else {
3920                 return false;
3921         }
3922
3923         return is_type_integer(inner);
3924 }
3925
3926 static ir_initializer_t *create_ir_initializer_list(
3927                 const initializer_list_t *initializer, type_t *type)
3928 {
3929         type_path_t path;
3930         memset(&path, 0, sizeof(path));
3931         path.top_type = type;
3932         path.path     = NEW_ARR_F(type_path_entry_t, 0);
3933
3934         descend_into_subtype(&path);
3935
3936         for (size_t i = 0; i < initializer->len; ++i) {
3937                 const initializer_t *sub_initializer = initializer->initializers[i];
3938
3939                 if (sub_initializer->kind == INITIALIZER_DESIGNATOR) {
3940                         walk_designator(&path, sub_initializer->designator.designator);
3941                         continue;
3942                 }
3943
3944                 if (sub_initializer->kind == INITIALIZER_VALUE) {
3945                         /* we might have to descend into types until we're at a scalar
3946                          * type */
3947                         while(true) {
3948                                 type_t *orig_top_type = path.top_type;
3949                                 type_t *top_type      = skip_typeref(orig_top_type);
3950
3951                                 if (is_type_scalar(top_type))
3952                                         break;
3953                                 descend_into_subtype(&path);
3954                         }
3955                 } else if (sub_initializer->kind == INITIALIZER_STRING
3956                                 || sub_initializer->kind == INITIALIZER_WIDE_STRING) {
3957                         /* we might have to descend into types until we're at a scalar
3958                          * type */
3959                         while (true) {
3960                                 type_t *orig_top_type = path.top_type;
3961                                 type_t *top_type      = skip_typeref(orig_top_type);
3962
3963                                 if (is_string_type(top_type))
3964                                         break;
3965                                 descend_into_subtype(&path);
3966                         }
3967                 }
3968
3969                 ir_initializer_t *sub_irinitializer
3970                         = create_ir_initializer(sub_initializer, path.top_type);
3971
3972                 size_t path_len = ARR_LEN(path.path);
3973                 assert(path_len >= 1);
3974                 type_path_entry_t *entry        = & path.path[path_len-1];
3975                 ir_initializer_t  *tinitializer = entry->initializer;
3976                 set_initializer_compound_value(tinitializer, entry->index,
3977                                                sub_irinitializer);
3978
3979                 advance_current_object(&path);
3980         }
3981
3982         assert(ARR_LEN(path.path) >= 1);
3983         ir_initializer_t *result = path.path[0].initializer;
3984         DEL_ARR_F(path.path);
3985
3986         return result;
3987 }
3988
3989 static ir_initializer_t *create_ir_initializer_string(
3990                 const initializer_string_t *initializer, type_t *type)
3991 {
3992         type = skip_typeref(type);
3993
3994         size_t            string_len    = initializer->string.size;
3995         assert(type->kind == TYPE_ARRAY);
3996         assert(type->array.size_constant);
3997         size_t            len           = type->array.size;
3998         ir_initializer_t *irinitializer = create_initializer_compound(len);
3999
4000         const char *string = initializer->string.begin;
4001         ir_mode    *mode   = get_ir_mode_storage(type->array.element_type);
4002
4003         for (size_t i = 0; i < len; ++i) {
4004                 char c = 0;
4005                 if (i < string_len)
4006                         c = string[i];
4007
4008                 ir_tarval        *tv = new_tarval_from_long(c, mode);
4009                 ir_initializer_t *char_initializer = create_initializer_tarval(tv);
4010
4011                 set_initializer_compound_value(irinitializer, i, char_initializer);
4012         }
4013
4014         return irinitializer;
4015 }
4016
4017 static ir_initializer_t *create_ir_initializer_wide_string(
4018                 const initializer_wide_string_t *initializer, type_t *type)
4019 {
4020         assert(type->kind == TYPE_ARRAY);
4021         assert(type->array.size_constant);
4022         size_t            len           = type->array.size;
4023         size_t            string_len    = wstrlen(&initializer->string);
4024         ir_initializer_t *irinitializer = create_initializer_compound(len);
4025
4026         const char *p    = initializer->string.begin;
4027         ir_mode    *mode = get_type_mode(ir_type_wchar_t);
4028
4029         for (size_t i = 0; i < len; ++i) {
4030                 utf32 c = 0;
4031                 if (i < string_len) {
4032                         c = read_utf8_char(&p);
4033                 }
4034                 ir_tarval *tv = new_tarval_from_long(c, mode);
4035                 ir_initializer_t *char_initializer = create_initializer_tarval(tv);
4036
4037                 set_initializer_compound_value(irinitializer, i, char_initializer);
4038         }
4039
4040         return irinitializer;
4041 }
4042
4043 static ir_initializer_t *create_ir_initializer(
4044                 const initializer_t *initializer, type_t *type)
4045 {
4046         switch(initializer->kind) {
4047                 case INITIALIZER_STRING:
4048                         return create_ir_initializer_string(&initializer->string, type);
4049
4050                 case INITIALIZER_WIDE_STRING:
4051                         return create_ir_initializer_wide_string(&initializer->wide_string,
4052                                                                  type);
4053
4054                 case INITIALIZER_LIST:
4055                         return create_ir_initializer_list(&initializer->list, type);
4056
4057                 case INITIALIZER_VALUE:
4058                         return create_ir_initializer_value(&initializer->value);
4059
4060                 case INITIALIZER_DESIGNATOR:
4061                         panic("unexpected designator initializer found");
4062         }
4063         panic("unknown initializer");
4064 }
4065
4066 /** ANSI C §6.7.8:21: If there are fewer initializers [..] than there
4067  *  are elements [...] the remainder of the aggregate shall be initialized
4068  *  implicitly the same as objects that have static storage duration. */
4069 static void create_dynamic_null_initializer(ir_entity *entity, dbg_info *dbgi,
4070                 ir_node *base_addr)
4071 {
4072         /* for unions we must NOT do anything for null initializers */
4073         ir_type *owner = get_entity_owner(entity);
4074         if (is_Union_type(owner)) {
4075                 return;
4076         }
4077
4078         ir_type *ent_type = get_entity_type(entity);
4079         /* create sub-initializers for a compound type */
4080         if (is_compound_type(ent_type)) {
4081                 unsigned n_members = get_compound_n_members(ent_type);
4082                 for (unsigned n = 0; n < n_members; ++n) {
4083                         ir_entity *member = get_compound_member(ent_type, n);
4084                         ir_node   *addr   = new_d_simpleSel(dbgi, new_NoMem(), base_addr,
4085                                                                 member);
4086                         create_dynamic_null_initializer(member, dbgi, addr);
4087                 }
4088                 return;
4089         }
4090         if (is_Array_type(ent_type)) {
4091                 assert(has_array_upper_bound(ent_type, 0));
4092                 long n = get_array_upper_bound_int(ent_type, 0);
4093                 for (long i = 0; i < n; ++i) {
4094                         ir_tarval *index_tv = new_tarval_from_long(i, mode_uint);
4095                         ir_node   *cnst     = new_d_Const(dbgi, index_tv);
4096                         ir_node   *in[1]    = { cnst };
4097                         ir_entity *arrent   = get_array_element_entity(ent_type);
4098                         ir_node   *addr     = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in,
4099                                                         arrent);
4100                         create_dynamic_null_initializer(arrent, dbgi, addr);
4101                 }
4102                 return;
4103         }
4104
4105         ir_mode *value_mode = get_type_mode(ent_type);
4106         ir_node *node       = new_Const(get_mode_null(value_mode));
4107
4108         /* is it a bitfield type? */
4109         if (is_Primitive_type(ent_type) &&
4110                         get_primitive_base_type(ent_type) != NULL) {
4111                 bitfield_store_to_firm(dbgi, entity, base_addr, node, false, false);
4112                 return;
4113         }
4114
4115         ir_node *mem    = get_store();
4116         ir_node *store  = new_d_Store(dbgi, mem, base_addr, node, cons_none);
4117         ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4118         set_store(proj_m);
4119 }
4120
4121 static void create_dynamic_initializer_sub(ir_initializer_t *initializer,
4122                 ir_entity *entity, ir_type *type, dbg_info *dbgi, ir_node *base_addr)
4123 {
4124         switch(get_initializer_kind(initializer)) {
4125         case IR_INITIALIZER_NULL:
4126                 create_dynamic_null_initializer(entity, dbgi, base_addr);
4127                 return;
4128         case IR_INITIALIZER_CONST: {
4129                 ir_node *node     = get_initializer_const_value(initializer);
4130                 ir_type *ent_type = get_entity_type(entity);
4131
4132                 /* is it a bitfield type? */
4133                 if (is_Primitive_type(ent_type) &&
4134                                 get_primitive_base_type(ent_type) != NULL) {
4135                         bitfield_store_to_firm(dbgi, entity, base_addr, node, false, false);
4136                         return;
4137                 }
4138
4139                 assert(get_type_mode(type) == get_irn_mode(node));
4140                 ir_node *mem    = get_store();
4141                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, node, cons_none);
4142                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4143                 set_store(proj_m);
4144                 return;
4145         }
4146         case IR_INITIALIZER_TARVAL: {
4147                 ir_tarval *tv       = get_initializer_tarval_value(initializer);
4148                 ir_node   *cnst     = new_d_Const(dbgi, tv);
4149                 ir_type   *ent_type = get_entity_type(entity);
4150
4151                 /* is it a bitfield type? */
4152                 if (is_Primitive_type(ent_type) &&
4153                                 get_primitive_base_type(ent_type) != NULL) {
4154                         bitfield_store_to_firm(dbgi, entity, base_addr, cnst, false, false);
4155                         return;
4156                 }
4157
4158                 assert(get_type_mode(type) == get_tarval_mode(tv));
4159                 ir_node *mem    = get_store();
4160                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, cnst, cons_none);
4161                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4162                 set_store(proj_m);
4163                 return;
4164         }
4165         case IR_INITIALIZER_COMPOUND: {
4166                 assert(is_compound_type(type) || is_Array_type(type));
4167                 int n_members;
4168                 if (is_Array_type(type)) {
4169                         assert(has_array_upper_bound(type, 0));
4170                         n_members = get_array_upper_bound_int(type, 0);
4171                 } else {
4172                         n_members = get_compound_n_members(type);
4173                 }
4174
4175                 if (get_initializer_compound_n_entries(initializer)
4176                                 != (unsigned) n_members)
4177                         panic("initializer doesn't match compound type");
4178
4179                 for (int i = 0; i < n_members; ++i) {
4180                         ir_node   *addr;
4181                         ir_type   *irtype;
4182                         ir_entity *sub_entity;
4183                         if (is_Array_type(type)) {
4184                                 ir_tarval *index_tv = new_tarval_from_long(i, mode_uint);
4185                                 ir_node   *cnst     = new_d_Const(dbgi, index_tv);
4186                                 ir_node   *in[1]    = { cnst };
4187                                 irtype     = get_array_element_type(type);
4188                                 sub_entity = get_array_element_entity(type);
4189                                 addr       = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in,
4190                                                        sub_entity);
4191                         } else {
4192                                 sub_entity = get_compound_member(type, i);
4193                                 irtype     = get_entity_type(sub_entity);
4194                                 addr       = new_d_simpleSel(dbgi, new_NoMem(), base_addr,
4195                                                              sub_entity);
4196                         }
4197
4198                         ir_initializer_t *sub_init
4199                                 = get_initializer_compound_value(initializer, i);
4200
4201                         create_dynamic_initializer_sub(sub_init, sub_entity, irtype, dbgi,
4202                                                        addr);
4203                 }
4204                 return;
4205         }
4206         }
4207
4208         panic("invalid IR_INITIALIZER found");
4209 }
4210
4211 static void create_dynamic_initializer(ir_initializer_t *initializer,
4212                 dbg_info *dbgi, ir_entity *entity)
4213 {
4214         ir_node *frame     = get_irg_frame(current_ir_graph);
4215         ir_node *base_addr = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
4216         ir_type *type      = get_entity_type(entity);
4217
4218         create_dynamic_initializer_sub(initializer, entity, type, dbgi, base_addr);
4219 }
4220
4221 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
4222                                      ir_entity *entity, type_t *type)
4223 {
4224         ir_node *memory = get_store();
4225         ir_node *nomem  = new_NoMem();
4226         ir_node *frame  = get_irg_frame(current_ir_graph);
4227         ir_node *addr   = new_d_simpleSel(dbgi, nomem, frame, entity);
4228
4229         if (initializer->kind == INITIALIZER_VALUE) {
4230                 initializer_value_t *initializer_value = &initializer->value;
4231
4232                 ir_node *value = expression_to_firm(initializer_value->value);
4233                 type = skip_typeref(type);
4234                 assign_value(dbgi, addr, type, value);
4235                 return;
4236         }
4237
4238         if (is_constant_initializer(initializer) == EXPR_CLASS_VARIABLE) {
4239                 ir_initializer_t *irinitializer
4240                         = create_ir_initializer(initializer, type);
4241
4242                 create_dynamic_initializer(irinitializer, dbgi, entity);
4243                 return;
4244         }
4245
4246         /* create the ir_initializer */
4247         ir_graph *const old_current_ir_graph = current_ir_graph;
4248         current_ir_graph = get_const_code_irg();
4249
4250         ir_initializer_t *irinitializer = create_ir_initializer(initializer, type);
4251
4252         assert(current_ir_graph == get_const_code_irg());
4253         current_ir_graph = old_current_ir_graph;
4254
4255         /* create a "template" entity which is copied to the entity on the stack */
4256         ident     *const id          = id_unique("initializer.%u");
4257         ir_type   *const irtype      = get_ir_type(type);
4258         ir_type   *const global_type = get_glob_type();
4259         ir_entity *const init_entity = new_d_entity(global_type, id, irtype, dbgi);
4260         set_entity_ld_ident(init_entity, id);
4261
4262         set_entity_visibility(init_entity, ir_visibility_private);
4263         add_entity_linkage(init_entity, IR_LINKAGE_CONSTANT);
4264
4265         set_entity_initializer(init_entity, irinitializer);
4266
4267         ir_node *const src_addr = create_symconst(dbgi, init_entity);
4268         ir_node *const copyb    = new_d_CopyB(dbgi, memory, addr, src_addr, irtype);
4269
4270         ir_node *const copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
4271         set_store(copyb_mem);
4272 }
4273
4274 static void create_initializer_local_variable_entity(entity_t *entity)
4275 {
4276         assert(entity->kind == ENTITY_VARIABLE);
4277         initializer_t *initializer = entity->variable.initializer;
4278         dbg_info      *dbgi        = get_dbg_info(&entity->base.source_position);
4279         ir_entity     *irentity    = entity->variable.v.entity;
4280         type_t        *type        = entity->declaration.type;
4281
4282         create_local_initializer(initializer, dbgi, irentity, type);
4283 }
4284
4285 static void create_variable_initializer(entity_t *entity)
4286 {
4287         assert(entity->kind == ENTITY_VARIABLE);
4288         initializer_t *initializer = entity->variable.initializer;
4289         if (initializer == NULL)
4290                 return;
4291
4292         declaration_kind_t declaration_kind
4293                 = (declaration_kind_t) entity->declaration.kind;
4294         if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY) {
4295                 create_initializer_local_variable_entity(entity);
4296                 return;
4297         }
4298
4299         type_t            *type = entity->declaration.type;
4300         type_qualifiers_t  tq   = get_type_qualifier(type, true);
4301
4302         if (initializer->kind == INITIALIZER_VALUE) {
4303                 initializer_value_t *initializer_value = &initializer->value;
4304                 dbg_info            *dbgi = get_dbg_info(&entity->base.source_position);
4305
4306                 ir_node *value = expression_to_firm(initializer_value->value);
4307
4308                 type_t  *init_type = initializer_value->value->base.type;
4309                 ir_mode *mode      = get_ir_mode_storage(init_type);
4310                 value = create_conv(dbgi, value, mode);
4311                 value = do_strict_conv(dbgi, value);
4312
4313                 if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE) {
4314                         set_value(entity->variable.v.value_number, value);
4315                 } else {
4316                         assert(declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4317
4318                         ir_entity *irentity = entity->variable.v.entity;
4319
4320                         if (tq & TYPE_QUALIFIER_CONST
4321                                         && get_entity_owner(irentity) != get_tls_type()) {
4322                                 add_entity_linkage(irentity, IR_LINKAGE_CONSTANT);
4323                         }
4324                         set_atomic_ent_value(irentity, value);
4325                 }
4326         } else {
4327                 assert(declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY ||
4328                        declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4329
4330                 ir_entity        *irentity        = entity->variable.v.entity;
4331                 ir_initializer_t *irinitializer
4332                         = create_ir_initializer(initializer, type);
4333
4334                 if (tq & TYPE_QUALIFIER_CONST) {
4335                         add_entity_linkage(irentity, IR_LINKAGE_CONSTANT);
4336                 }
4337                 set_entity_initializer(irentity, irinitializer);
4338         }
4339 }
4340
4341 static void create_variable_length_array(entity_t *entity)
4342 {
4343         assert(entity->kind == ENTITY_VARIABLE);
4344         assert(entity->variable.initializer == NULL);
4345
4346         entity->declaration.kind    = DECLARATION_KIND_VARIABLE_LENGTH_ARRAY;
4347         entity->variable.v.vla_base = NULL;
4348
4349         /* TODO: record VLA somewhere so we create the free node when we leave
4350          * it's scope */
4351 }
4352
4353 static void allocate_variable_length_array(entity_t *entity)
4354 {
4355         assert(entity->kind == ENTITY_VARIABLE);
4356         assert(entity->variable.initializer == NULL);
4357         assert(currently_reachable());
4358
4359         dbg_info *dbgi      = get_dbg_info(&entity->base.source_position);
4360         type_t   *type      = entity->declaration.type;
4361         ir_type  *el_type   = get_ir_type(type->array.element_type);
4362
4363         /* make sure size_node is calculated */
4364         get_type_size_node(type);
4365         ir_node  *elems = type->array.size_node;
4366         ir_node  *mem   = get_store();
4367         ir_node  *alloc = new_d_Alloc(dbgi, mem, elems, el_type, stack_alloc);
4368
4369         ir_node  *proj_m = new_d_Proj(dbgi, alloc, mode_M, pn_Alloc_M);
4370         ir_node  *addr   = new_d_Proj(dbgi, alloc, mode_P_data, pn_Alloc_res);
4371         set_store(proj_m);
4372
4373         assert(entity->declaration.kind == DECLARATION_KIND_VARIABLE_LENGTH_ARRAY);
4374         entity->variable.v.vla_base = addr;
4375 }
4376
4377 /**
4378  * Creates a Firm local variable from a declaration.
4379  */
4380 static void create_local_variable(entity_t *entity)
4381 {
4382         assert(entity->kind == ENTITY_VARIABLE);
4383         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4384
4385         bool needs_entity = entity->variable.address_taken;
4386         type_t *type = skip_typeref(entity->declaration.type);
4387
4388         /* is it a variable length array? */
4389         if (is_type_array(type) && !type->array.size_constant) {
4390                 create_variable_length_array(entity);
4391                 return;
4392         } else if (is_type_array(type) || is_type_compound(type)) {
4393                 needs_entity = true;
4394         } else if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
4395                 needs_entity = true;
4396         }
4397
4398         if (needs_entity) {
4399                 ir_type *frame_type = get_irg_frame_type(current_ir_graph);
4400                 create_variable_entity(entity,
4401                                        DECLARATION_KIND_LOCAL_VARIABLE_ENTITY,
4402                                        frame_type);
4403         } else {
4404                 entity->declaration.kind        = DECLARATION_KIND_LOCAL_VARIABLE;
4405                 entity->variable.v.value_number = next_value_number_function;
4406                 set_irg_loc_description(current_ir_graph, next_value_number_function,
4407                                         entity);
4408                 ++next_value_number_function;
4409         }
4410 }
4411
4412 static void create_local_static_variable(entity_t *entity)
4413 {
4414         assert(entity->kind == ENTITY_VARIABLE);
4415         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4416
4417         type_t   *type           = skip_typeref(entity->declaration.type);
4418         ir_type  *const var_type = entity->variable.thread_local ?
4419                 get_tls_type() : get_glob_type();
4420         ir_type  *const irtype   = get_ir_type(type);
4421         dbg_info *const dbgi     = get_dbg_info(&entity->base.source_position);
4422
4423         size_t l = strlen(entity->base.symbol->string);
4424         char   buf[l + sizeof(".%u")];
4425         snprintf(buf, sizeof(buf), "%s.%%u", entity->base.symbol->string);
4426         ident     *const id       = id_unique(buf);
4427         ir_entity *const irentity = new_d_entity(var_type, id, irtype, dbgi);
4428
4429         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
4430                 set_entity_volatility(irentity, volatility_is_volatile);
4431         }
4432
4433         entity->declaration.kind  = DECLARATION_KIND_GLOBAL_VARIABLE;
4434         entity->variable.v.entity = irentity;
4435
4436         set_entity_ld_ident(irentity, id);
4437         set_entity_visibility(irentity, ir_visibility_local);
4438
4439         ir_graph *const old_current_ir_graph = current_ir_graph;
4440         current_ir_graph = get_const_code_irg();
4441
4442         create_variable_initializer(entity);
4443
4444         assert(current_ir_graph == get_const_code_irg());
4445         current_ir_graph = old_current_ir_graph;
4446 }
4447
4448
4449
4450 static void return_statement_to_firm(return_statement_t *statement)
4451 {
4452         if (!currently_reachable())
4453                 return;
4454
4455         dbg_info *dbgi        = get_dbg_info(&statement->base.source_position);
4456         type_t   *type        = current_function_entity->declaration.type;
4457         ir_type  *func_irtype = get_ir_type(type);
4458
4459         ir_node *in[1];
4460         int      in_len;
4461         if (get_method_n_ress(func_irtype) > 0) {
4462                 ir_type *res_type = get_method_res_type(func_irtype, 0);
4463
4464                 if (statement->value != NULL) {
4465                         ir_node *node = expression_to_firm(statement->value);
4466                         if (!is_compound_type(res_type)) {
4467                                 type_t  *ret_value_type = statement->value->base.type;
4468                                 ir_mode *mode           = get_ir_mode_storage(ret_value_type);
4469                                 node                    = create_conv(dbgi, node, mode);
4470                                 node                    = do_strict_conv(dbgi, node);
4471                         }
4472                         in[0] = node;
4473                 } else {
4474                         ir_mode *mode;
4475                         if (is_compound_type(res_type)) {
4476                                 mode = mode_P_data;
4477                         } else {
4478                                 mode = get_type_mode(res_type);
4479                         }
4480                         in[0] = new_Unknown(mode);
4481                 }
4482                 in_len = 1;
4483         } else {
4484                 /* build return_value for its side effects */
4485                 if (statement->value != NULL) {
4486                         expression_to_firm(statement->value);
4487                 }
4488                 in_len = 0;
4489         }
4490
4491         ir_node  *store = get_store();
4492         ir_node  *ret   = new_d_Return(dbgi, store, in_len, in);
4493
4494         ir_node *end_block = get_irg_end_block(current_ir_graph);
4495         add_immBlock_pred(end_block, ret);
4496
4497         set_unreachable_now();
4498 }
4499
4500 static ir_node *expression_statement_to_firm(expression_statement_t *statement)
4501 {
4502         if (!currently_reachable())
4503                 return NULL;
4504
4505         return expression_to_firm(statement->expression);
4506 }
4507
4508 static ir_node *compound_statement_to_firm(compound_statement_t *compound)
4509 {
4510         entity_t *entity = compound->scope.entities;
4511         for ( ; entity != NULL; entity = entity->base.next) {
4512                 if (!is_declaration(entity))
4513                         continue;
4514
4515                 create_local_declaration(entity);
4516         }
4517
4518         ir_node     *result    = NULL;
4519         statement_t *statement = compound->statements;
4520         for ( ; statement != NULL; statement = statement->base.next) {
4521                 if (statement->base.next == NULL
4522                                 && statement->kind == STATEMENT_EXPRESSION) {
4523                         result = expression_statement_to_firm(
4524                                         &statement->expression);
4525                         break;
4526                 }
4527                 statement_to_firm(statement);
4528         }
4529
4530         return result;
4531 }
4532
4533 static void create_global_variable(entity_t *entity)
4534 {
4535         ir_linkage    linkage    = IR_LINKAGE_DEFAULT;
4536         ir_visibility visibility = ir_visibility_default;
4537         ir_entity    *irentity;
4538         assert(entity->kind == ENTITY_VARIABLE);
4539
4540         switch ((storage_class_tag_t)entity->declaration.storage_class) {
4541         case STORAGE_CLASS_EXTERN: visibility = ir_visibility_external; break;
4542         case STORAGE_CLASS_STATIC: visibility = ir_visibility_local;    break;
4543         case STORAGE_CLASS_NONE:
4544                 visibility = ir_visibility_default;
4545                 /* uninitialized globals get merged in C */
4546                 if (entity->variable.initializer == NULL)
4547                         linkage |= IR_LINKAGE_MERGE;
4548                 break;
4549         case STORAGE_CLASS_TYPEDEF:
4550         case STORAGE_CLASS_AUTO:
4551         case STORAGE_CLASS_REGISTER:
4552                 panic("invalid storage class for global var");
4553         }
4554
4555         ir_type *var_type = get_glob_type();
4556         if (entity->variable.thread_local) {
4557                 var_type = get_tls_type();
4558                 /* LINKAGE_MERGE not supported by current linkers */
4559                 linkage &= ~IR_LINKAGE_MERGE;
4560         }
4561         create_variable_entity(entity, DECLARATION_KIND_GLOBAL_VARIABLE, var_type);
4562         irentity = entity->variable.v.entity;
4563         add_entity_linkage(irentity, linkage);
4564         set_entity_visibility(irentity, visibility);
4565 }
4566
4567 static void create_local_declaration(entity_t *entity)
4568 {
4569         assert(is_declaration(entity));
4570
4571         /* construct type */
4572         (void) get_ir_type(entity->declaration.type);
4573         if (entity->base.symbol == NULL) {
4574                 return;
4575         }
4576
4577         switch ((storage_class_tag_t) entity->declaration.storage_class) {
4578         case STORAGE_CLASS_STATIC:
4579                 if (entity->kind == ENTITY_FUNCTION) {
4580                         (void)get_function_entity(entity, NULL);
4581                 } else {
4582                         create_local_static_variable(entity);
4583                 }
4584                 return;
4585         case STORAGE_CLASS_EXTERN:
4586                 if (entity->kind == ENTITY_FUNCTION) {
4587                         assert(entity->function.statement == NULL);
4588                         (void)get_function_entity(entity, NULL);
4589                 } else {
4590                         create_global_variable(entity);
4591                         create_variable_initializer(entity);
4592                 }
4593                 return;
4594         case STORAGE_CLASS_NONE:
4595         case STORAGE_CLASS_AUTO:
4596         case STORAGE_CLASS_REGISTER:
4597                 if (entity->kind == ENTITY_FUNCTION) {
4598                         if (entity->function.statement != NULL) {
4599                                 ir_type *owner = get_irg_frame_type(current_ir_graph);
4600                                 (void)get_function_entity(entity, owner);
4601                                 entity->declaration.kind = DECLARATION_KIND_INNER_FUNCTION;
4602                                 enqueue_inner_function(entity);
4603                         } else {
4604                                 (void)get_function_entity(entity, NULL);
4605                         }
4606                 } else {
4607                         create_local_variable(entity);
4608                 }
4609                 return;
4610         case STORAGE_CLASS_TYPEDEF:
4611                 break;
4612         }
4613         panic("invalid storage class found");
4614 }
4615
4616 static void initialize_local_declaration(entity_t *entity)
4617 {
4618         if (entity->base.symbol == NULL)
4619                 return;
4620
4621         // no need to emit code in dead blocks
4622         if (entity->declaration.storage_class != STORAGE_CLASS_STATIC
4623                         && !currently_reachable())
4624                 return;
4625
4626         switch ((declaration_kind_t) entity->declaration.kind) {
4627         case DECLARATION_KIND_LOCAL_VARIABLE:
4628         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY:
4629                 create_variable_initializer(entity);
4630                 return;
4631
4632         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
4633                 allocate_variable_length_array(entity);
4634                 return;
4635
4636         case DECLARATION_KIND_COMPOUND_MEMBER:
4637         case DECLARATION_KIND_GLOBAL_VARIABLE:
4638         case DECLARATION_KIND_FUNCTION:
4639         case DECLARATION_KIND_INNER_FUNCTION:
4640                 return;
4641
4642         case DECLARATION_KIND_PARAMETER:
4643         case DECLARATION_KIND_PARAMETER_ENTITY:
4644                 panic("can't initialize parameters");
4645
4646         case DECLARATION_KIND_UNKNOWN:
4647                 panic("can't initialize unknown declaration");
4648         }
4649         panic("invalid declaration kind");
4650 }
4651
4652 static void declaration_statement_to_firm(declaration_statement_t *statement)
4653 {
4654         entity_t *entity = statement->declarations_begin;
4655         if (entity == NULL)
4656                 return;
4657
4658         entity_t *const last = statement->declarations_end;
4659         for ( ;; entity = entity->base.next) {
4660                 if (is_declaration(entity)) {
4661                         initialize_local_declaration(entity);
4662                 } else if (entity->kind == ENTITY_TYPEDEF) {
4663                         /* §6.7.7:3  Any array size expressions associated with variable length
4664                          * array declarators are evaluated each time the declaration of the
4665                          * typedef name is reached in the order of execution. */
4666                         type_t *const type = skip_typeref(entity->typedefe.type);
4667                         if (is_type_array(type) && type->array.is_vla)
4668                                 get_vla_size(&type->array);
4669                 }
4670                 if (entity == last)
4671                         break;
4672         }
4673 }
4674
4675 static void if_statement_to_firm(if_statement_t *statement)
4676 {
4677         /* Create the condition. */
4678         ir_node *true_block  = NULL;
4679         ir_node *false_block = NULL;
4680         if (currently_reachable()) {
4681                 true_block  = new_immBlock();
4682                 false_block = new_immBlock();
4683                 create_condition_evaluation(statement->condition, true_block, false_block);
4684                 mature_immBlock(true_block);
4685         }
4686
4687         /* Create the false statement.
4688          * Handle false before true, so if no false statement is present, then the
4689          * empty false block is reused as fallthrough block. */
4690         ir_node *fallthrough_block = NULL;
4691         if (statement->false_statement != NULL) {
4692                 if (false_block != NULL) {
4693                         mature_immBlock(false_block);
4694                 }
4695                 set_cur_block(false_block);
4696                 statement_to_firm(statement->false_statement);
4697                 if (currently_reachable()) {
4698                         fallthrough_block = new_immBlock();
4699                         add_immBlock_pred(fallthrough_block, new_Jmp());
4700                 }
4701         } else {
4702                 fallthrough_block = false_block;
4703         }
4704
4705         /* Create the true statement. */
4706         set_cur_block(true_block);
4707         statement_to_firm(statement->true_statement);
4708         if (currently_reachable()) {
4709                 if (fallthrough_block == NULL) {
4710                         fallthrough_block = new_immBlock();
4711                 }
4712                 add_immBlock_pred(fallthrough_block, new_Jmp());
4713         }
4714
4715         /* Handle the block after the if-statement. */
4716         if (fallthrough_block != NULL) {
4717                 mature_immBlock(fallthrough_block);
4718         }
4719         set_cur_block(fallthrough_block);
4720 }
4721
4722 /* Create a jump node which jumps into target_block, if the current block is
4723  * reachable. */
4724 static void jump_if_reachable(ir_node *const target_block)
4725 {
4726         ir_node *const pred = currently_reachable() ? new_Jmp() : new_Bad(mode_X);
4727         add_immBlock_pred(target_block, pred);
4728 }
4729
4730 static void while_statement_to_firm(while_statement_t *statement)
4731 {
4732         /* Create the header block */
4733         ir_node *const header_block = new_immBlock();
4734         jump_if_reachable(header_block);
4735
4736         /* Create the condition. */
4737         ir_node      *      body_block;
4738         ir_node      *      false_block;
4739         expression_t *const cond = statement->condition;
4740         if (is_constant_expression(cond) == EXPR_CLASS_CONSTANT &&
4741                         fold_constant_to_bool(cond)) {
4742                 /* Shortcut for while (true). */
4743                 body_block  = header_block;
4744                 false_block = NULL;
4745
4746                 keep_alive(header_block);
4747                 keep_all_memory(header_block);
4748         } else {
4749                 body_block  = new_immBlock();
4750                 false_block = new_immBlock();
4751
4752                 set_cur_block(header_block);
4753                 create_condition_evaluation(cond, body_block, false_block);
4754                 mature_immBlock(body_block);
4755         }
4756
4757         ir_node *const old_continue_label = continue_label;
4758         ir_node *const old_break_label    = break_label;
4759         continue_label = header_block;
4760         break_label    = false_block;
4761
4762         /* Create the loop body. */
4763         set_cur_block(body_block);
4764         statement_to_firm(statement->body);
4765         jump_if_reachable(header_block);
4766
4767         mature_immBlock(header_block);
4768         assert(false_block == NULL || false_block == break_label);
4769         false_block = break_label;
4770         if (false_block != NULL) {
4771                 mature_immBlock(false_block);
4772         }
4773         set_cur_block(false_block);
4774
4775         assert(continue_label == header_block);
4776         continue_label = old_continue_label;
4777         break_label    = old_break_label;
4778 }
4779
4780 static ir_node *get_break_label(void)
4781 {
4782         if (break_label == NULL) {
4783                 break_label = new_immBlock();
4784         }
4785         return break_label;
4786 }
4787
4788 static void do_while_statement_to_firm(do_while_statement_t *statement)
4789 {
4790         /* create the header block */
4791         ir_node *header_block = new_immBlock();
4792
4793         /* the loop body */
4794         ir_node *body_block = new_immBlock();
4795         jump_if_reachable(body_block);
4796
4797         ir_node *old_continue_label = continue_label;
4798         ir_node *old_break_label    = break_label;
4799         continue_label              = header_block;
4800         break_label                 = NULL;
4801
4802         set_cur_block(body_block);
4803         statement_to_firm(statement->body);
4804         ir_node *const false_block = get_break_label();
4805
4806         assert(continue_label == header_block);
4807         continue_label = old_continue_label;
4808         break_label    = old_break_label;
4809
4810         jump_if_reachable(header_block);
4811
4812         /* create the condition */
4813         mature_immBlock(header_block);
4814         set_cur_block(header_block);
4815
4816         create_condition_evaluation(statement->condition, body_block, false_block);
4817         mature_immBlock(body_block);
4818         mature_immBlock(false_block);
4819
4820         set_cur_block(false_block);
4821 }
4822
4823 static void for_statement_to_firm(for_statement_t *statement)
4824 {
4825         /* create declarations */
4826         entity_t *entity = statement->scope.entities;
4827         for ( ; entity != NULL; entity = entity->base.next) {
4828                 if (!is_declaration(entity))
4829                         continue;
4830
4831                 create_local_declaration(entity);
4832         }
4833
4834         if (currently_reachable()) {
4835                 entity = statement->scope.entities;
4836                 for ( ; entity != NULL; entity = entity->base.next) {
4837                         if (!is_declaration(entity))
4838                                 continue;
4839
4840                         initialize_local_declaration(entity);
4841                 }
4842
4843                 if (statement->initialisation != NULL) {
4844                         expression_to_firm(statement->initialisation);
4845                 }
4846         }
4847
4848         /* Create the header block */
4849         ir_node *const header_block = new_immBlock();
4850         jump_if_reachable(header_block);
4851
4852         /* Create the condition. */
4853         ir_node *body_block;
4854         ir_node *false_block;
4855         if (statement->condition != NULL) {
4856                 body_block  = new_immBlock();
4857                 false_block = new_immBlock();
4858
4859                 set_cur_block(header_block);
4860                 create_condition_evaluation(statement->condition, body_block, false_block);
4861                 mature_immBlock(body_block);
4862         } else {
4863                 /* for-ever. */
4864                 body_block  = header_block;
4865                 false_block = NULL;
4866
4867                 keep_alive(header_block);
4868                 keep_all_memory(header_block);
4869         }
4870
4871         /* Create the step block, if necessary. */
4872         ir_node      *      step_block = header_block;
4873         expression_t *const step       = statement->step;
4874         if (step != NULL) {
4875                 step_block = new_immBlock();
4876         }
4877
4878         ir_node *const old_continue_label = continue_label;
4879         ir_node *const old_break_label    = break_label;
4880         continue_label = step_block;
4881         break_label    = false_block;
4882
4883         /* Create the loop body. */
4884         set_cur_block(body_block);
4885         statement_to_firm(statement->body);
4886         jump_if_reachable(step_block);
4887
4888         /* Create the step code. */
4889         if (step != NULL) {
4890                 mature_immBlock(step_block);
4891                 set_cur_block(step_block);
4892                 expression_to_firm(step);
4893                 jump_if_reachable(header_block);
4894         }
4895
4896         mature_immBlock(header_block);
4897         assert(false_block == NULL || false_block == break_label);
4898         false_block = break_label;
4899         if (false_block != NULL) {
4900                 mature_immBlock(false_block);
4901         }
4902         set_cur_block(false_block);
4903
4904         assert(continue_label == step_block);
4905         continue_label = old_continue_label;
4906         break_label    = old_break_label;
4907 }
4908
4909 static void create_jump_statement(const statement_t *statement,
4910                                   ir_node *target_block)
4911 {
4912         if (!currently_reachable())
4913                 return;
4914
4915         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
4916         ir_node  *jump = new_d_Jmp(dbgi);
4917         add_immBlock_pred(target_block, jump);
4918
4919         set_unreachable_now();
4920 }
4921
4922 static void switch_statement_to_firm(switch_statement_t *statement)
4923 {
4924         ir_node  *first_block = NULL;
4925         dbg_info *dbgi        = get_dbg_info(&statement->base.source_position);
4926         ir_node  *cond        = NULL;
4927
4928         if (currently_reachable()) {
4929                 ir_node *expression = expression_to_firm(statement->expression);
4930                 cond                = new_d_Cond(dbgi, expression);
4931                 first_block         = get_cur_block();
4932         }
4933
4934         set_unreachable_now();
4935
4936         ir_node *const old_switch_cond       = current_switch_cond;
4937         ir_node *const old_break_label       = break_label;
4938         const bool     old_saw_default_label = saw_default_label;
4939         saw_default_label                    = false;
4940         current_switch_cond                  = cond;
4941         break_label                          = NULL;
4942         switch_statement_t *const old_switch = current_switch;
4943         current_switch                       = statement;
4944
4945         /* determine a free number for the default label */
4946         unsigned long num_cases       = 0;
4947         long          default_proj_nr = 0;
4948         for (case_label_statement_t *l = statement->first_case; l != NULL; l = l->next) {
4949                 if (l->expression == NULL) {
4950                         /* default case */
4951                         continue;
4952                 }
4953                 if (l->last_case >= l->first_case)
4954                         num_cases += l->last_case - l->first_case + 1;
4955                 if (l->last_case > default_proj_nr)
4956                         default_proj_nr = l->last_case;
4957         }
4958
4959         if (default_proj_nr == LONG_MAX) {
4960                 /* Bad: an overflow will occur, we cannot be sure that the
4961                  * maximum + 1 is a free number. Scan the values a second
4962                  * time to find a free number.
4963                  */
4964                 unsigned char *bits = xmalloc((num_cases + 7) >> 3);
4965
4966                 memset(bits, 0, (num_cases + 7) >> 3);
4967                 for (case_label_statement_t *l = statement->first_case; l != NULL; l = l->next) {
4968                         if (l->expression == NULL) {
4969                                 /* default case */
4970                                 continue;
4971                         }
4972                         unsigned long start = l->first_case > 0 ? (unsigned long)l->first_case : 0;
4973                         if (start < num_cases && l->last_case >= 0) {
4974                                 unsigned long end  = (unsigned long)l->last_case < num_cases ?
4975                                         (unsigned long)l->last_case : num_cases - 1;
4976                                 for (unsigned long cns = start; cns <= end; ++cns) {
4977                                         bits[cns >> 3] |= (1 << (cns & 7));
4978                                 }
4979                         }
4980                 }
4981                 /* We look at the first num_cases constants:
4982                  * Either they are dense, so we took the last (num_cases)
4983                  * one, or they are not dense, so we will find one free
4984                  * there...
4985                  */
4986                 unsigned long i;
4987                 for (i = 0; i < num_cases; ++i)
4988                         if ((bits[i >> 3] & (1 << (i & 7))) == 0)
4989                                 break;
4990
4991                 free(bits);
4992                 default_proj_nr = i;
4993         } else {
4994                 ++default_proj_nr;
4995         }
4996         statement->default_proj_nr = default_proj_nr;
4997         /* safety check: cond might already be folded to a Bad */
4998         if (cond != NULL && is_Cond(cond)) {
4999                 set_Cond_default_proj(cond, default_proj_nr);
5000         }
5001
5002         statement_to_firm(statement->body);
5003
5004         jump_if_reachable(get_break_label());
5005
5006         if (!saw_default_label && first_block != NULL) {
5007                 set_cur_block(first_block);
5008                 ir_node *const proj = new_d_Proj(dbgi, cond, mode_X, default_proj_nr);
5009                 add_immBlock_pred(get_break_label(), proj);
5010         }
5011
5012         if (break_label != NULL) {
5013                 mature_immBlock(break_label);
5014         }
5015         set_cur_block(break_label);
5016
5017         assert(current_switch_cond == cond);
5018         current_switch      = old_switch;
5019         current_switch_cond = old_switch_cond;
5020         break_label         = old_break_label;
5021         saw_default_label   = old_saw_default_label;
5022 }
5023
5024 static void case_label_to_firm(const case_label_statement_t *statement)
5025 {
5026         if (statement->is_empty_range)
5027                 return;
5028
5029         ir_node *block = new_immBlock();
5030         /* Fallthrough from previous case */
5031         jump_if_reachable(block);
5032
5033         if (current_switch_cond != NULL) {
5034                 set_cur_block(get_nodes_block(current_switch_cond));
5035                 dbg_info *const dbgi = get_dbg_info(&statement->base.source_position);
5036                 if (statement->expression != NULL) {
5037                         long pn     = statement->first_case;
5038                         long end_pn = statement->last_case;
5039                         assert(pn <= end_pn);
5040                         /* create jumps for all cases in the given range */
5041                         do {
5042                                 ir_node *const proj = new_d_Proj(dbgi, current_switch_cond, mode_X, pn);
5043                                 add_immBlock_pred(block, proj);
5044                         } while (pn++ < end_pn);
5045                 } else {
5046                         saw_default_label = true;
5047                         ir_node *const proj = new_d_Proj(dbgi, current_switch_cond, mode_X,
5048                                                          current_switch->default_proj_nr);
5049                         add_immBlock_pred(block, proj);
5050                 }
5051         }
5052
5053         mature_immBlock(block);
5054         set_cur_block(block);
5055
5056         statement_to_firm(statement->statement);
5057 }
5058
5059 static void label_to_firm(const label_statement_t *statement)
5060 {
5061         ir_node *block = get_label_block(statement->label);
5062         jump_if_reachable(block);
5063
5064         set_cur_block(block);
5065         keep_alive(block);
5066         keep_all_memory(block);
5067
5068         statement_to_firm(statement->statement);
5069 }
5070
5071 static void goto_to_firm(const goto_statement_t *statement)
5072 {
5073         if (!currently_reachable())
5074                 return;
5075
5076         if (statement->expression) {
5077                 ir_node  *irn  = expression_to_firm(statement->expression);
5078                 dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
5079                 ir_node  *ijmp = new_d_IJmp(dbgi, irn);
5080
5081                 set_irn_link(ijmp, ijmp_list);
5082                 ijmp_list = ijmp;
5083         } else {
5084                 ir_node *block = get_label_block(statement->label);
5085                 ir_node *jmp   = new_Jmp();
5086                 add_immBlock_pred(block, jmp);
5087         }
5088         set_unreachable_now();
5089 }
5090
5091 static void asm_statement_to_firm(const asm_statement_t *statement)
5092 {
5093         bool needs_memory = false;
5094
5095         if (statement->is_volatile) {
5096                 needs_memory = true;
5097         }
5098
5099         size_t         n_clobbers = 0;
5100         asm_clobber_t *clobber    = statement->clobbers;
5101         for ( ; clobber != NULL; clobber = clobber->next) {
5102                 const char *clobber_str = clobber->clobber.begin;
5103
5104                 if (!be_is_valid_clobber(clobber_str)) {
5105                         errorf(&statement->base.source_position,
5106                                    "invalid clobber '%s' specified", clobber->clobber);
5107                         continue;
5108                 }
5109
5110                 if (streq(clobber_str, "memory")) {
5111                         needs_memory = true;
5112                         continue;
5113                 }
5114
5115                 ident *id = new_id_from_str(clobber_str);
5116                 obstack_ptr_grow(&asm_obst, id);
5117                 ++n_clobbers;
5118         }
5119         assert(obstack_object_size(&asm_obst) == n_clobbers * sizeof(ident*));
5120         ident **clobbers = NULL;
5121         if (n_clobbers > 0) {
5122                 clobbers = obstack_finish(&asm_obst);
5123         }
5124
5125         size_t n_inputs  = 0;
5126         asm_argument_t *argument = statement->inputs;
5127         for ( ; argument != NULL; argument = argument->next)
5128                 n_inputs++;
5129         size_t n_outputs = 0;
5130         argument = statement->outputs;
5131         for ( ; argument != NULL; argument = argument->next)
5132                 n_outputs++;
5133
5134         unsigned next_pos = 0;
5135
5136         ir_node *ins[n_inputs + n_outputs + 1];
5137         size_t   in_size = 0;
5138
5139         ir_asm_constraint tmp_in_constraints[n_outputs];
5140
5141         const expression_t *out_exprs[n_outputs];
5142         ir_node            *out_addrs[n_outputs];
5143         size_t              out_size = 0;
5144
5145         argument = statement->outputs;
5146         for ( ; argument != NULL; argument = argument->next) {
5147                 const char *constraints = argument->constraints.begin;
5148                 asm_constraint_flags_t asm_flags
5149                         = be_parse_asm_constraints(constraints);
5150
5151                 {
5152                         source_position_t const *const pos = &statement->base.source_position;
5153                         if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
5154                                 warningf(WARN_OTHER, pos, "some constraints in '%s' are not supported", constraints);
5155                         }
5156                         if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
5157                                 errorf(pos, "some constraints in '%s' are invalid", constraints);
5158                                 continue;
5159                         }
5160                         if (! (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE)) {
5161                                 errorf(pos, "no write flag specified for output constraints '%s'", constraints);
5162                                 continue;
5163                         }
5164                 }
5165
5166                 unsigned pos = next_pos++;
5167                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
5168                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
5169                         expression_t *expr = argument->expression;
5170                         ir_node      *addr = expression_to_addr(expr);
5171                         /* in+output, construct an artifical same_as constraint on the
5172                          * input */
5173                         if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_READ) {
5174                                 char     buf[64];
5175                                 ir_node *value = get_value_from_lvalue(expr, addr);
5176
5177                                 snprintf(buf, sizeof(buf), "%u", (unsigned) out_size);
5178
5179                                 ir_asm_constraint constraint;
5180                                 constraint.pos              = pos;
5181                                 constraint.constraint       = new_id_from_str(buf);
5182                                 constraint.mode             = get_ir_mode_storage(expr->base.type);
5183                                 tmp_in_constraints[in_size] = constraint;
5184                                 ins[in_size] = value;
5185
5186                                 ++in_size;
5187                         }
5188
5189                         out_exprs[out_size] = expr;
5190                         out_addrs[out_size] = addr;
5191                         ++out_size;
5192                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
5193                         /* pure memory ops need no input (but we have to make sure we
5194                          * attach to the memory) */
5195                         assert(! (asm_flags &
5196                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
5197                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
5198                         needs_memory = true;
5199
5200                         /* we need to attach the address to the inputs */
5201                         expression_t *expr = argument->expression;
5202
5203                         ir_asm_constraint constraint;
5204                         constraint.pos              = pos;
5205                         constraint.constraint       = new_id_from_str(constraints);
5206                         constraint.mode             = NULL;
5207                         tmp_in_constraints[in_size] = constraint;
5208
5209                         ins[in_size]          = expression_to_addr(expr);
5210                         ++in_size;
5211                         continue;
5212                 } else {
5213                         errorf(&statement->base.source_position,
5214                                "only modifiers but no place set in constraints '%s'",
5215                                constraints);
5216                         continue;
5217                 }
5218
5219                 ir_asm_constraint constraint;
5220                 constraint.pos        = pos;
5221                 constraint.constraint = new_id_from_str(constraints);
5222                 constraint.mode       = get_ir_mode_storage(argument->expression->base.type);
5223
5224                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5225         }
5226         assert(obstack_object_size(&asm_obst)
5227                         == out_size * sizeof(ir_asm_constraint));
5228         ir_asm_constraint *output_constraints = obstack_finish(&asm_obst);
5229
5230
5231         obstack_grow(&asm_obst, tmp_in_constraints,
5232                      in_size * sizeof(tmp_in_constraints[0]));
5233         /* find and count input and output arguments */
5234         argument = statement->inputs;
5235         for ( ; argument != NULL; argument = argument->next) {
5236                 const char *constraints = argument->constraints.begin;
5237                 asm_constraint_flags_t asm_flags
5238                         = be_parse_asm_constraints(constraints);
5239
5240                 if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
5241                         errorf(&statement->base.source_position,
5242                                "some constraints in '%s' are not supported", constraints);
5243                         continue;
5244                 }
5245                 if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
5246                         errorf(&statement->base.source_position,
5247                                "some constraints in '%s' are invalid", constraints);
5248                         continue;
5249                 }
5250                 if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE) {
5251                         errorf(&statement->base.source_position,
5252                                "write flag specified for input constraints '%s'",
5253                                constraints);
5254                         continue;
5255                 }
5256
5257                 ir_node *input;
5258                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
5259                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
5260                         /* we can treat this as "normal" input */
5261                         input = expression_to_firm(argument->expression);
5262                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
5263                         /* pure memory ops need no input (but we have to make sure we
5264                          * attach to the memory) */
5265                         assert(! (asm_flags &
5266                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
5267                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
5268                         needs_memory = true;
5269                         input = expression_to_addr(argument->expression);
5270                 } else {
5271                         errorf(&statement->base.source_position,
5272                                "only modifiers but no place set in constraints '%s'",
5273                                constraints);
5274                         continue;
5275                 }
5276
5277                 ir_asm_constraint constraint;
5278                 constraint.pos        = next_pos++;
5279                 constraint.constraint = new_id_from_str(constraints);
5280                 constraint.mode       = get_irn_mode(input);
5281
5282                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5283                 ins[in_size++] = input;
5284         }
5285
5286         if (needs_memory) {
5287                 ir_asm_constraint constraint;
5288                 constraint.pos        = next_pos++;
5289                 constraint.constraint = new_id_from_str("");
5290                 constraint.mode       = mode_M;
5291
5292                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5293                 ins[in_size++] = get_store();
5294         }
5295
5296         assert(obstack_object_size(&asm_obst)
5297                         == in_size * sizeof(ir_asm_constraint));
5298         ir_asm_constraint *input_constraints = obstack_finish(&asm_obst);
5299
5300         /* create asm node */
5301         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
5302
5303         ident *asm_text = new_id_from_str(statement->asm_text.begin);
5304
5305         ir_node *node = new_d_ASM(dbgi, in_size, ins, input_constraints,
5306                                   out_size, output_constraints,
5307                                   n_clobbers, clobbers, asm_text);
5308
5309         if (statement->is_volatile) {
5310                 set_irn_pinned(node, op_pin_state_pinned);
5311         } else {
5312                 set_irn_pinned(node, op_pin_state_floats);
5313         }
5314
5315         /* create output projs & connect them */
5316         if (needs_memory) {
5317                 ir_node *projm = new_Proj(node, mode_M, out_size);
5318                 set_store(projm);
5319         }
5320
5321         size_t i;
5322         for (i = 0; i < out_size; ++i) {
5323                 const expression_t *out_expr = out_exprs[i];
5324                 long                pn       = i;
5325                 ir_mode            *mode     = get_ir_mode_storage(out_expr->base.type);
5326                 ir_node            *proj     = new_Proj(node, mode, pn);
5327                 ir_node            *addr     = out_addrs[i];
5328
5329                 set_value_for_expression_addr(out_expr, proj, addr);
5330         }
5331 }
5332
5333 static void ms_try_statement_to_firm(ms_try_statement_t *statement)
5334 {
5335         statement_to_firm(statement->try_statement);
5336         source_position_t const *const pos = &statement->base.source_position;
5337         warningf(WARN_OTHER, pos, "structured exception handling ignored");
5338 }
5339
5340 static void leave_statement_to_firm(leave_statement_t *statement)
5341 {
5342         errorf(&statement->base.source_position, "__leave not supported yet");
5343 }
5344
5345 /**
5346  * Transform a statement.
5347  */
5348 static void statement_to_firm(statement_t *statement)
5349 {
5350 #ifndef NDEBUG
5351         assert(!statement->base.transformed);
5352         statement->base.transformed = true;
5353 #endif
5354
5355         switch (statement->kind) {
5356         case STATEMENT_ERROR:
5357                 panic("error statement found");
5358         case STATEMENT_EMPTY:
5359                 /* nothing */
5360                 return;
5361         case STATEMENT_COMPOUND:
5362                 compound_statement_to_firm(&statement->compound);
5363                 return;
5364         case STATEMENT_RETURN:
5365                 return_statement_to_firm(&statement->returns);
5366                 return;
5367         case STATEMENT_EXPRESSION:
5368                 expression_statement_to_firm(&statement->expression);
5369                 return;
5370         case STATEMENT_IF:
5371                 if_statement_to_firm(&statement->ifs);
5372                 return;
5373         case STATEMENT_WHILE:
5374                 while_statement_to_firm(&statement->whiles);
5375                 return;
5376         case STATEMENT_DO_WHILE:
5377                 do_while_statement_to_firm(&statement->do_while);
5378                 return;
5379         case STATEMENT_DECLARATION:
5380                 declaration_statement_to_firm(&statement->declaration);
5381                 return;
5382         case STATEMENT_BREAK:
5383                 create_jump_statement(statement, get_break_label());
5384                 return;
5385         case STATEMENT_CONTINUE:
5386                 create_jump_statement(statement, continue_label);
5387                 return;
5388         case STATEMENT_SWITCH:
5389                 switch_statement_to_firm(&statement->switchs);
5390                 return;
5391         case STATEMENT_CASE_LABEL:
5392                 case_label_to_firm(&statement->case_label);
5393                 return;
5394         case STATEMENT_FOR:
5395                 for_statement_to_firm(&statement->fors);
5396                 return;
5397         case STATEMENT_LABEL:
5398                 label_to_firm(&statement->label);
5399                 return;
5400         case STATEMENT_GOTO:
5401                 goto_to_firm(&statement->gotos);
5402                 return;
5403         case STATEMENT_ASM:
5404                 asm_statement_to_firm(&statement->asms);
5405                 return;
5406         case STATEMENT_MS_TRY:
5407                 ms_try_statement_to_firm(&statement->ms_try);
5408                 return;
5409         case STATEMENT_LEAVE:
5410                 leave_statement_to_firm(&statement->leave);
5411                 return;
5412         }
5413         panic("statement not implemented");
5414 }
5415
5416 static int count_local_variables(const entity_t *entity,
5417                                  const entity_t *const last)
5418 {
5419         int count = 0;
5420         entity_t const *const end = last != NULL ? last->base.next : NULL;
5421         for (; entity != end; entity = entity->base.next) {
5422                 type_t *type;
5423                 bool    address_taken;
5424
5425                 if (entity->kind == ENTITY_VARIABLE) {
5426                         type          = skip_typeref(entity->declaration.type);
5427                         address_taken = entity->variable.address_taken;
5428                 } else if (entity->kind == ENTITY_PARAMETER) {
5429                         type          = skip_typeref(entity->declaration.type);
5430                         address_taken = entity->parameter.address_taken;
5431                 } else {
5432                         continue;
5433                 }
5434
5435                 if (!address_taken && is_type_scalar(type))
5436                         ++count;
5437         }
5438         return count;
5439 }
5440
5441 static void count_local_variables_in_stmt(statement_t *stmt, void *const env)
5442 {
5443         int *const count = env;
5444
5445         switch (stmt->kind) {
5446         case STATEMENT_DECLARATION: {
5447                 const declaration_statement_t *const decl_stmt = &stmt->declaration;
5448                 *count += count_local_variables(decl_stmt->declarations_begin,
5449                                 decl_stmt->declarations_end);
5450                 break;
5451         }
5452
5453         case STATEMENT_FOR:
5454                 *count += count_local_variables(stmt->fors.scope.entities, NULL);
5455                 break;
5456
5457         default:
5458                 break;
5459         }
5460 }
5461
5462 /**
5463  * Return the number of local (alias free) variables used by a function.
5464  */
5465 static int get_function_n_local_vars(entity_t *entity)
5466 {
5467         const function_t *function = &entity->function;
5468         int count = 0;
5469
5470         /* count parameters */
5471         count += count_local_variables(function->parameters.entities, NULL);
5472
5473         /* count local variables declared in body */
5474         walk_statements(function->statement, count_local_variables_in_stmt, &count);
5475         return count;
5476 }
5477
5478 /**
5479  * Build Firm code for the parameters of a function.
5480  */
5481 static void initialize_function_parameters(entity_t *entity)
5482 {
5483         assert(entity->kind == ENTITY_FUNCTION);
5484         ir_graph *irg             = current_ir_graph;
5485         ir_node  *args            = get_irg_args(irg);
5486         int       n               = 0;
5487         ir_type  *function_irtype;
5488
5489         if (entity->function.need_closure) {
5490                 /* add an extra parameter for the static link */
5491                 entity->function.static_link = new_r_Proj(args, mode_P_data, 0);
5492                 ++n;
5493
5494                 /* Matze: IMO this is wrong, nested functions should have an own
5495                  * type and not rely on strange parameters... */
5496                 function_irtype = create_method_type(&entity->declaration.type->function, true);
5497         } else {
5498                 function_irtype = get_ir_type(entity->declaration.type);
5499         }
5500
5501
5502
5503         entity_t *parameter = entity->function.parameters.entities;
5504         for ( ; parameter != NULL; parameter = parameter->base.next, ++n) {
5505                 if (parameter->kind != ENTITY_PARAMETER)
5506                         continue;
5507
5508                 assert(parameter->declaration.kind == DECLARATION_KIND_UNKNOWN);
5509                 type_t *type = skip_typeref(parameter->declaration.type);
5510
5511                 bool needs_entity = parameter->parameter.address_taken;
5512                 assert(!is_type_array(type));
5513                 if (is_type_compound(type)) {
5514                         needs_entity = true;
5515                 }
5516
5517                 ir_type *param_irtype = get_method_param_type(function_irtype, n);
5518                 if (needs_entity) {
5519                         ir_type   *frame_type = get_irg_frame_type(irg);
5520                         ir_entity *param
5521                                 = new_parameter_entity(frame_type, n, param_irtype);
5522                         parameter->declaration.kind
5523                                 = DECLARATION_KIND_PARAMETER_ENTITY;
5524                         parameter->parameter.v.entity = param;
5525                         continue;
5526                 }
5527
5528                 ir_mode *param_mode = get_type_mode(param_irtype);
5529                 long     pn         = n;
5530                 ir_node *value      = new_r_Proj(args, param_mode, pn);
5531
5532                 ir_mode *mode = get_ir_mode_storage(type);
5533                 value = create_conv(NULL, value, mode);
5534                 value = do_strict_conv(NULL, value);
5535
5536                 parameter->declaration.kind         = DECLARATION_KIND_PARAMETER;
5537                 parameter->parameter.v.value_number = next_value_number_function;
5538                 set_irg_loc_description(current_ir_graph, next_value_number_function,
5539                                         parameter);
5540                 ++next_value_number_function;
5541
5542                 set_value(parameter->parameter.v.value_number, value);
5543         }
5544 }
5545
5546 /**
5547  * Handle additional decl modifiers for IR-graphs
5548  *
5549  * @param irg            the IR-graph
5550  * @param dec_modifiers  additional modifiers
5551  */
5552 static void handle_decl_modifier_irg(ir_graph_ptr irg,
5553                                      decl_modifiers_t decl_modifiers)
5554 {
5555         if (decl_modifiers & DM_NAKED) {
5556                 /* TRUE if the declaration includes the Microsoft
5557                    __declspec(naked) specifier. */
5558                 add_irg_additional_properties(irg, mtp_property_naked);
5559         }
5560         if (decl_modifiers & DM_FORCEINLINE) {
5561                 /* TRUE if the declaration includes the
5562                    Microsoft __forceinline specifier. */
5563                 set_irg_inline_property(irg, irg_inline_forced);
5564         }
5565         if (decl_modifiers & DM_NOINLINE) {
5566                 /* TRUE if the declaration includes the Microsoft
5567                    __declspec(noinline) specifier. */
5568                 set_irg_inline_property(irg, irg_inline_forbidden);
5569         }
5570 }
5571
5572 static void add_function_pointer(ir_type *segment, ir_entity *method,
5573                                  const char *unique_template)
5574 {
5575         ir_type   *method_type  = get_entity_type(method);
5576         ir_type   *ptr_type     = new_type_pointer(method_type);
5577
5578         /* these entities don't really have a name but firm only allows
5579          * "" in ld_ident.
5580          * Note that we mustn't give these entities a name since for example
5581          * Mach-O doesn't allow them. */
5582         ident     *ide          = id_unique(unique_template);
5583         ir_entity *ptr          = new_entity(segment, ide, ptr_type);
5584         ir_graph  *irg          = get_const_code_irg();
5585         ir_node   *val          = new_rd_SymConst_addr_ent(NULL, irg, mode_P_code,
5586                                                            method);
5587
5588         set_entity_ld_ident(ptr, new_id_from_chars("", 0));
5589         set_entity_compiler_generated(ptr, 1);
5590         set_entity_visibility(ptr, ir_visibility_private);
5591         add_entity_linkage(ptr, IR_LINKAGE_CONSTANT|IR_LINKAGE_HIDDEN_USER);
5592         set_atomic_ent_value(ptr, val);
5593 }
5594
5595 /**
5596  * Generate possible IJmp branches to a given label block.
5597  */
5598 static void gen_ijmp_branches(ir_node *block)
5599 {
5600         ir_node *ijmp;
5601         for (ijmp = ijmp_list; ijmp != NULL; ijmp = get_irn_link(ijmp)) {
5602                 add_immBlock_pred(block, ijmp);
5603         }
5604 }
5605
5606 /**
5607  * Create code for a function and all inner functions.
5608  *
5609  * @param entity  the function entity
5610  */
5611 static void create_function(entity_t *entity)
5612 {
5613         assert(entity->kind == ENTITY_FUNCTION);
5614         ir_entity *function_entity = get_function_entity(entity, current_outer_frame);
5615
5616         if (entity->function.statement == NULL)
5617                 return;
5618
5619         inner_functions     = NULL;
5620         current_trampolines = NULL;
5621
5622         if (entity->declaration.modifiers & DM_CONSTRUCTOR) {
5623                 ir_type *segment = get_segment_type(IR_SEGMENT_CONSTRUCTORS);
5624                 add_function_pointer(segment, function_entity, "constructor_ptr.%u");
5625         }
5626         if (entity->declaration.modifiers & DM_DESTRUCTOR) {
5627                 ir_type *segment = get_segment_type(IR_SEGMENT_DESTRUCTORS);
5628                 add_function_pointer(segment, function_entity, "destructor_ptr.%u");
5629         }
5630
5631         current_function_entity = entity;
5632         current_function_name   = NULL;
5633         current_funcsig         = NULL;
5634
5635         assert(all_labels == NULL);
5636         all_labels = NEW_ARR_F(label_t *, 0);
5637         ijmp_list  = NULL;
5638
5639         int       n_local_vars = get_function_n_local_vars(entity);
5640         ir_graph *irg          = new_ir_graph(function_entity, n_local_vars);
5641         current_ir_graph = irg;
5642
5643         ir_graph *old_current_function = current_function;
5644         current_function = irg;
5645
5646         ir_entity *const old_current_vararg_entity = current_vararg_entity;
5647         current_vararg_entity = NULL;
5648
5649         set_irg_fp_model(irg, firm_fp_model);
5650         tarval_enable_fp_ops(1);
5651         set_irn_dbg_info(get_irg_start_block(irg),
5652                          get_entity_dbg_info(function_entity));
5653
5654         ir_node *first_block = get_cur_block();
5655
5656         /* set inline flags */
5657         if (entity->function.is_inline)
5658                 set_irg_inline_property(irg, irg_inline_recomended);
5659         handle_decl_modifier_irg(irg, entity->declaration.modifiers);
5660
5661         next_value_number_function = 0;
5662         initialize_function_parameters(entity);
5663         current_static_link = entity->function.static_link;
5664
5665         statement_to_firm(entity->function.statement);
5666
5667         ir_node *end_block = get_irg_end_block(irg);
5668
5669         /* do we have a return statement yet? */
5670         if (currently_reachable()) {
5671                 type_t *type = skip_typeref(entity->declaration.type);
5672                 assert(is_type_function(type));
5673                 const function_type_t *func_type   = &type->function;
5674                 const type_t          *return_type
5675                         = skip_typeref(func_type->return_type);
5676
5677                 ir_node *ret;
5678                 if (is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
5679                         ret = new_Return(get_store(), 0, NULL);
5680                 } else {
5681                         ir_mode *mode;
5682                         if (is_type_scalar(return_type)) {
5683                                 mode = get_ir_mode_storage(func_type->return_type);
5684                         } else {
5685                                 mode = mode_P_data;
5686                         }
5687
5688                         ir_node *in[1];
5689                         /* §5.1.2.2.3 main implicitly returns 0 */
5690                         if (is_main(entity)) {
5691                                 in[0] = new_Const(get_mode_null(mode));
5692                         } else {
5693                                 in[0] = new_Unknown(mode);
5694                         }
5695                         ret = new_Return(get_store(), 1, in);
5696                 }
5697                 add_immBlock_pred(end_block, ret);
5698         }
5699
5700         bool has_computed_gotos = false;
5701         for (int i = ARR_LEN(all_labels) - 1; i >= 0; --i) {
5702                 label_t *label = all_labels[i];
5703                 if (label->address_taken) {
5704                         gen_ijmp_branches(label->block);
5705                         has_computed_gotos = true;
5706                 }
5707                 mature_immBlock(label->block);
5708         }
5709         if (has_computed_gotos) {
5710                 /* if we have computed goto's in the function, we cannot inline it */
5711                 if (get_irg_inline_property(irg) >= irg_inline_recomended) {
5712                         source_position_t const *const pos = &entity->base.source_position;
5713                         warningf(WARN_OTHER, pos, "'%N' can never be inlined because it contains a computed goto", entity);
5714                 }
5715                 set_irg_inline_property(irg, irg_inline_forbidden);
5716         }
5717
5718         DEL_ARR_F(all_labels);
5719         all_labels = NULL;
5720
5721         mature_immBlock(first_block);
5722         mature_immBlock(end_block);
5723
5724         irg_finalize_cons(irg);
5725
5726         /* finalize the frame type */
5727         ir_type *frame_type = get_irg_frame_type(irg);
5728         int      n          = get_compound_n_members(frame_type);
5729         int      align_all  = 4;
5730         int      offset     = 0;
5731         for (int i = 0; i < n; ++i) {
5732                 ir_entity *member      = get_compound_member(frame_type, i);
5733                 ir_type   *entity_type = get_entity_type(member);
5734
5735                 int align = get_type_alignment_bytes(entity_type);
5736                 if (align > align_all)
5737                         align_all = align;
5738                 int misalign = 0;
5739                 if (align > 0) {
5740                         misalign  = offset % align;
5741                         if (misalign > 0) {
5742                                 offset += align - misalign;
5743                         }
5744                 }
5745
5746                 set_entity_offset(member, offset);
5747                 offset += get_type_size_bytes(entity_type);
5748         }
5749         set_type_size_bytes(frame_type, offset);
5750         set_type_alignment_bytes(frame_type, align_all);
5751
5752         irg_verify(irg, VERIFY_ENFORCE_SSA);
5753         current_vararg_entity = old_current_vararg_entity;
5754         current_function      = old_current_function;
5755
5756         if (current_trampolines != NULL) {
5757                 DEL_ARR_F(current_trampolines);
5758                 current_trampolines = NULL;
5759         }
5760
5761         /* create inner functions if any */
5762         entity_t **inner = inner_functions;
5763         if (inner != NULL) {
5764                 ir_type *rem_outer_frame      = current_outer_frame;
5765                 current_outer_frame           = get_irg_frame_type(current_ir_graph);
5766                 for (int i = ARR_LEN(inner) - 1; i >= 0; --i) {
5767                         create_function(inner[i]);
5768                 }
5769                 DEL_ARR_F(inner);
5770
5771                 current_outer_frame      = rem_outer_frame;
5772         }
5773 }
5774
5775 static void scope_to_firm(scope_t *scope)
5776 {
5777         /* first pass: create declarations */
5778         entity_t *entity = scope->entities;
5779         for ( ; entity != NULL; entity = entity->base.next) {
5780                 if (entity->base.symbol == NULL)
5781                         continue;
5782
5783                 if (entity->kind == ENTITY_FUNCTION) {
5784                         if (entity->function.btk != BUILTIN_NONE) {
5785                                 /* builtins have no representation */
5786                                 continue;
5787                         }
5788                         (void)get_function_entity(entity, NULL);
5789                 } else if (entity->kind == ENTITY_VARIABLE) {
5790                         create_global_variable(entity);
5791                 } else if (entity->kind == ENTITY_NAMESPACE) {
5792                         scope_to_firm(&entity->namespacee.members);
5793                 }
5794         }
5795
5796         /* second pass: create code/initializers */
5797         entity = scope->entities;
5798         for ( ; entity != NULL; entity = entity->base.next) {
5799                 if (entity->base.symbol == NULL)
5800                         continue;
5801
5802                 if (entity->kind == ENTITY_FUNCTION) {
5803                         if (entity->function.btk != BUILTIN_NONE) {
5804                                 /* builtins have no representation */
5805                                 continue;
5806                         }
5807                         create_function(entity);
5808                 } else if (entity->kind == ENTITY_VARIABLE) {
5809                         assert(entity->declaration.kind
5810                                         == DECLARATION_KIND_GLOBAL_VARIABLE);
5811                         current_ir_graph = get_const_code_irg();
5812                         create_variable_initializer(entity);
5813                 }
5814         }
5815 }
5816
5817 void init_ast2firm(void)
5818 {
5819         obstack_init(&asm_obst);
5820         init_atomic_modes();
5821
5822         ir_set_debug_retrieve(dbg_retrieve);
5823         ir_set_type_debug_retrieve(dbg_print_type_dbg_info);
5824
5825         /* create idents for all known runtime functions */
5826         for (size_t i = 0; i < lengthof(rts_data); ++i) {
5827                 rts_idents[i] = new_id_from_str(rts_data[i].name);
5828         }
5829
5830         entitymap_init(&entitymap);
5831 }
5832
5833 static void init_ir_types(void)
5834 {
5835         static int ir_types_initialized = 0;
5836         if (ir_types_initialized)
5837                 return;
5838         ir_types_initialized = 1;
5839
5840         ir_type_int        = get_ir_type(type_int);
5841         ir_type_char       = get_ir_type(type_char);
5842         ir_type_const_char = get_ir_type(type_const_char);
5843         ir_type_wchar_t    = get_ir_type(type_wchar_t);
5844         ir_type_void       = get_ir_type(type_void);
5845
5846         be_params             = be_get_backend_param();
5847         mode_float_arithmetic = be_params->mode_float_arithmetic;
5848
5849         stack_param_align     = be_params->stack_param_align;
5850 }
5851
5852 void exit_ast2firm(void)
5853 {
5854         entitymap_destroy(&entitymap);
5855         obstack_free(&asm_obst, NULL);
5856 }
5857
5858 static void global_asm_to_firm(statement_t *s)
5859 {
5860         for (; s != NULL; s = s->base.next) {
5861                 assert(s->kind == STATEMENT_ASM);
5862
5863                 char const *const text = s->asms.asm_text.begin;
5864                 size_t            size = s->asms.asm_text.size;
5865
5866                 /* skip the last \0 */
5867                 if (text[size - 1] == '\0')
5868                         --size;
5869
5870                 ident *const id = new_id_from_chars(text, size);
5871                 add_irp_asm(id);
5872         }
5873 }
5874
5875 void translation_unit_to_firm(translation_unit_t *unit)
5876 {
5877         /* initialize firm arithmetic */
5878         tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
5879         ir_set_uninitialized_local_variable_func(uninitialized_local_var);
5880
5881         /* just to be sure */
5882         continue_label           = NULL;
5883         break_label              = NULL;
5884         current_switch_cond      = NULL;
5885         current_translation_unit = unit;
5886
5887         init_ir_types();
5888
5889         scope_to_firm(&unit->scope);
5890         global_asm_to_firm(unit->global_asm);
5891
5892         current_ir_graph         = NULL;
5893         current_translation_unit = NULL;
5894 }