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         ir_type *irtype = get_ir_type(type);
1453         if (is_compound_type(irtype)
1454                         || is_Method_type(irtype)
1455                         || is_Array_type(irtype)) {
1456                 return addr;
1457         }
1458
1459         ir_cons_flags  flags    = type->base.qualifiers & TYPE_QUALIFIER_VOLATILE
1460                                   ? cons_volatile : cons_none;
1461         ir_mode *const mode     = get_type_mode(irtype);
1462         ir_node *const memory   = get_store();
1463         ir_node *const load     = new_d_Load(dbgi, memory, addr, mode, flags);
1464         ir_node *const load_mem = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
1465         ir_node *const load_res = new_d_Proj(dbgi, load, mode,   pn_Load_res);
1466
1467         set_store(load_mem);
1468
1469         ir_mode *const mode_arithmetic = get_ir_mode_arithmetic(type);
1470         return create_conv(dbgi, load_res, mode_arithmetic);
1471 }
1472
1473 /**
1474  * Creates a strict Conv (to the node's mode) if necessary.
1475  *
1476  * @param dbgi  debug info
1477  * @param node  the node to strict conv
1478  */
1479 static ir_node *do_strict_conv(dbg_info *dbgi, ir_node *node)
1480 {
1481         ir_mode *mode = get_irn_mode(node);
1482
1483         if (!(get_irg_fp_model(current_ir_graph) & fp_explicit_rounding))
1484                 return node;
1485         if (!mode_is_float(mode))
1486                 return node;
1487
1488         /* check if there is already a Conv */
1489         if (is_Conv(node)) {
1490                 /* convert it into a strict Conv */
1491                 set_Conv_strict(node, 1);
1492                 return node;
1493         }
1494
1495         /* otherwise create a new one */
1496         return new_d_strictConv(dbgi, node, mode);
1497 }
1498
1499 /**
1500  * Returns the correct base address depending on whether it is a parameter or a
1501  * normal local variable.
1502  */
1503 static ir_node *get_local_frame(ir_entity *const ent)
1504 {
1505         ir_graph      *const irg   = current_ir_graph;
1506         const ir_type *const owner = get_entity_owner(ent);
1507         if (owner == current_outer_frame) {
1508                 assert(current_static_link != NULL);
1509                 return current_static_link;
1510         } else {
1511                 return get_irg_frame(irg);
1512         }
1513 }
1514
1515 /**
1516  * Keep all memory edges of the given block.
1517  */
1518 static void keep_all_memory(ir_node *block)
1519 {
1520         ir_node *old = get_cur_block();
1521
1522         set_cur_block(block);
1523         keep_alive(get_store());
1524         /* TODO: keep all memory edges from restricted pointers */
1525         set_cur_block(old);
1526 }
1527
1528 static ir_node *reference_expression_enum_value_to_firm(
1529                 const reference_expression_t *ref)
1530 {
1531         entity_t *entity = ref->entity;
1532         if (entity->enum_value.tv == NULL) {
1533                 type_t *type = skip_typeref(entity->enum_value.enum_type);
1534                 assert(type->kind == TYPE_ENUM);
1535                 determine_enum_values(&type->enumt);
1536         }
1537
1538         return new_Const(entity->enum_value.tv);
1539 }
1540
1541 static ir_node *reference_expression_to_firm(const reference_expression_t *ref)
1542 {
1543         dbg_info *dbgi   = get_dbg_info(&ref->base.source_position);
1544         entity_t *entity = ref->entity;
1545         assert(is_declaration(entity));
1546         type_t   *type   = skip_typeref(entity->declaration.type);
1547
1548         /* make sure the type is constructed */
1549         (void) get_ir_type(type);
1550
1551         if (entity->kind == ENTITY_FUNCTION
1552             && entity->function.btk != BUILTIN_NONE) {
1553                 ir_entity *irentity = get_function_entity(entity, NULL);
1554                 /* for gcc compatibility we have to produce (dummy) addresses for some
1555                  * builtins which don't have entities */
1556                 if (irentity == NULL) {
1557                         source_position_t const *const pos = &ref->base.source_position;
1558                         symbol_t          const *const sym = ref->entity->base.symbol;
1559                         warningf(WARN_OTHER, pos, "taking address of builtin '%Y'", sym);
1560
1561                         /* simply create a NULL pointer */
1562                         ir_mode  *mode = get_ir_mode_arithmetic(type_void_ptr);
1563                         ir_node  *res  = new_Const(get_mode_null(mode));
1564
1565                         return res;
1566                 }
1567         }
1568
1569         switch ((declaration_kind_t) entity->declaration.kind) {
1570         case DECLARATION_KIND_UNKNOWN:
1571                 break;
1572
1573         case DECLARATION_KIND_LOCAL_VARIABLE: {
1574                 ir_mode *const mode  = get_ir_mode_storage(type);
1575                 ir_node *const value = get_value(entity->variable.v.value_number, mode);
1576                 return create_conv(NULL, value, get_ir_mode_arithmetic(type));
1577         }
1578         case DECLARATION_KIND_PARAMETER: {
1579                 ir_mode *const mode  = get_ir_mode_storage(type);
1580                 ir_node *const value = get_value(entity->parameter.v.value_number,mode);
1581                 return create_conv(NULL, value, get_ir_mode_arithmetic(type));
1582         }
1583         case DECLARATION_KIND_FUNCTION: {
1584                 return create_symconst(dbgi, entity->function.irentity);
1585         }
1586         case DECLARATION_KIND_INNER_FUNCTION: {
1587                 ir_mode *const mode = get_ir_mode_storage(type);
1588                 if (!entity->function.goto_to_outer && !entity->function.need_closure) {
1589                         /* inner function not using the closure */
1590                         return create_symconst(dbgi, entity->function.irentity);
1591                 } else {
1592                         /* need trampoline here */
1593                         return create_trampoline(dbgi, mode, entity->function.irentity);
1594                 }
1595         }
1596         case DECLARATION_KIND_GLOBAL_VARIABLE: {
1597                 const variable_t *variable = &entity->variable;
1598                 ir_node *const addr = create_symconst(dbgi, variable->v.entity);
1599                 return deref_address(dbgi, variable->base.type, addr);
1600         }
1601
1602         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY: {
1603                 ir_entity *irentity = entity->variable.v.entity;
1604                 ir_node   *frame    = get_local_frame(irentity);
1605                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1606                 return deref_address(dbgi, entity->declaration.type, sel);
1607         }
1608         case DECLARATION_KIND_PARAMETER_ENTITY: {
1609                 ir_entity *irentity = entity->parameter.v.entity;
1610                 ir_node   *frame    = get_local_frame(irentity);
1611                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1612                 return deref_address(dbgi, entity->declaration.type, sel);
1613         }
1614
1615         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
1616                 return entity->variable.v.vla_base;
1617
1618         case DECLARATION_KIND_COMPOUND_MEMBER:
1619                 panic("not implemented reference type");
1620         }
1621
1622         panic("reference to declaration with unknown type found");
1623 }
1624
1625 static ir_node *reference_addr(const reference_expression_t *ref)
1626 {
1627         dbg_info *dbgi   = get_dbg_info(&ref->base.source_position);
1628         entity_t *entity = ref->entity;
1629         assert(is_declaration(entity));
1630
1631         switch((declaration_kind_t) entity->declaration.kind) {
1632         case DECLARATION_KIND_UNKNOWN:
1633                 break;
1634         case DECLARATION_KIND_PARAMETER:
1635         case DECLARATION_KIND_LOCAL_VARIABLE:
1636                 /* you can store to a local variable (so we don't panic but return NULL
1637                  * as an indicator for no real address) */
1638                 return NULL;
1639         case DECLARATION_KIND_GLOBAL_VARIABLE: {
1640                 ir_node *const addr = create_symconst(dbgi, entity->variable.v.entity);
1641                 return addr;
1642         }
1643         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY: {
1644                 ir_entity *irentity = entity->variable.v.entity;
1645                 ir_node   *frame    = get_local_frame(irentity);
1646                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1647
1648                 return sel;
1649         }
1650         case DECLARATION_KIND_PARAMETER_ENTITY: {
1651                 ir_entity *irentity = entity->parameter.v.entity;
1652                 ir_node   *frame    = get_local_frame(irentity);
1653                 ir_node   *sel = new_d_simpleSel(dbgi, new_NoMem(), frame, irentity);
1654
1655                 return sel;
1656         }
1657
1658         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
1659                 return entity->variable.v.vla_base;
1660
1661         case DECLARATION_KIND_FUNCTION: {
1662                 return create_symconst(dbgi, entity->function.irentity);
1663         }
1664
1665         case DECLARATION_KIND_INNER_FUNCTION: {
1666                 type_t  *const type = skip_typeref(entity->declaration.type);
1667                 ir_mode *const mode = get_ir_mode_storage(type);
1668                 if (!entity->function.goto_to_outer && !entity->function.need_closure) {
1669                         /* inner function not using the closure */
1670                         return create_symconst(dbgi, entity->function.irentity);
1671                 } else {
1672                         /* need trampoline here */
1673                         return create_trampoline(dbgi, mode, entity->function.irentity);
1674                 }
1675         }
1676
1677         case DECLARATION_KIND_COMPOUND_MEMBER:
1678                 panic("not implemented reference type");
1679         }
1680
1681         panic("reference to declaration with unknown type found");
1682 }
1683
1684 /**
1685  * Transform calls to builtin functions.
1686  */
1687 static ir_node *process_builtin_call(const call_expression_t *call)
1688 {
1689         dbg_info *dbgi = get_dbg_info(&call->base.source_position);
1690
1691         assert(call->function->kind == EXPR_REFERENCE);
1692         reference_expression_t *builtin = &call->function->reference;
1693
1694         type_t *expr_type = skip_typeref(builtin->base.type);
1695         assert(is_type_pointer(expr_type));
1696
1697         type_t *function_type = skip_typeref(expr_type->pointer.points_to);
1698
1699         switch (builtin->entity->function.btk) {
1700         case BUILTIN_NONE:
1701                 break;
1702         case BUILTIN_ALLOCA: {
1703                 expression_t *argument = call->arguments->expression;
1704                 ir_node      *size     = expression_to_firm(argument);
1705
1706                 ir_node *store  = get_store();
1707                 ir_node *alloca = new_d_Alloc(dbgi, store, size, firm_unknown_type,
1708                                               stack_alloc);
1709                 ir_node *proj_m = new_Proj(alloca, mode_M, pn_Alloc_M);
1710                 set_store(proj_m);
1711                 ir_node *res    = new_Proj(alloca, mode_P_data, pn_Alloc_res);
1712
1713                 return res;
1714         }
1715         case BUILTIN_INF: {
1716                 type_t    *type = function_type->function.return_type;
1717                 ir_mode   *mode = get_ir_mode_arithmetic(type);
1718                 ir_tarval *tv   = get_mode_infinite(mode);
1719                 ir_node   *res  = new_d_Const(dbgi, tv);
1720                 return res;
1721         }
1722         case BUILTIN_NAN: {
1723                 /* Ignore string for now... */
1724                 assert(is_type_function(function_type));
1725                 type_t    *type = function_type->function.return_type;
1726                 ir_mode   *mode = get_ir_mode_arithmetic(type);
1727                 ir_tarval *tv   = get_mode_NAN(mode);
1728                 ir_node   *res  = new_d_Const(dbgi, tv);
1729                 return res;
1730         }
1731         case BUILTIN_EXPECT: {
1732                 expression_t *argument = call->arguments->expression;
1733                 return _expression_to_firm(argument);
1734         }
1735         case BUILTIN_VA_END:
1736                 /* evaluate the argument of va_end for its side effects */
1737                 _expression_to_firm(call->arguments->expression);
1738                 return NULL;
1739         case BUILTIN_OBJECT_SIZE: {
1740                 /* determine value of "type" */
1741                 expression_t *type_expression = call->arguments->next->expression;
1742                 long          type_val        = fold_constant_to_int(type_expression);
1743                 type_t       *type            = function_type->function.return_type;
1744                 ir_mode      *mode            = get_ir_mode_arithmetic(type);
1745                 /* just produce a "I don't know" result */
1746                 ir_tarval    *result          = type_val & 2 ? get_mode_null(mode) :
1747                                                 get_mode_minus_one(mode);
1748
1749                 return new_d_Const(dbgi, result);
1750         }
1751         case BUILTIN_ROTL: {
1752                 ir_node *val  = expression_to_firm(call->arguments->expression);
1753                 ir_node *shf  = expression_to_firm(call->arguments->next->expression);
1754                 ir_mode *mode = get_irn_mode(val);
1755                 return new_d_Rotl(dbgi, val, create_conv(dbgi, shf, mode_uint), mode);
1756         }
1757         case BUILTIN_ROTR: {
1758                 ir_node *val  = expression_to_firm(call->arguments->expression);
1759                 ir_node *shf  = expression_to_firm(call->arguments->next->expression);
1760                 ir_mode *mode = get_irn_mode(val);
1761                 ir_node *c    = new_Const_long(mode_uint, get_mode_size_bits(mode));
1762                 ir_node *sub  = new_d_Sub(dbgi, c, create_conv(dbgi, shf, mode_uint), mode_uint);
1763                 return new_d_Rotl(dbgi, val, sub, mode);
1764         }
1765         case BUILTIN_FIRM:
1766                 break;
1767         case BUILTIN_LIBC:
1768         case BUILTIN_LIBC_CHECK:
1769                 panic("builtin did not produce an entity");
1770         }
1771         panic("invalid builtin found");
1772 }
1773
1774 /**
1775  * Transform a call expression.
1776  * Handles some special cases, like alloca() calls, which must be resolved
1777  * BEFORE the inlines runs. Inlining routines calling alloca() is dangerous,
1778  * 176.gcc for instance might allocate 2GB instead of 256 MB if alloca is not
1779  * handled right...
1780  */
1781 static ir_node *call_expression_to_firm(const call_expression_t *const call)
1782 {
1783         dbg_info *const dbgi = get_dbg_info(&call->base.source_position);
1784         assert(currently_reachable());
1785
1786         expression_t   *function = call->function;
1787         ir_node        *callee   = NULL;
1788         bool            firm_builtin = false;
1789         ir_builtin_kind firm_builtin_kind = ir_bk_trap;
1790         if (function->kind == EXPR_REFERENCE) {
1791                 const reference_expression_t *ref    = &function->reference;
1792                 entity_t                     *entity = ref->entity;
1793
1794                 if (entity->kind == ENTITY_FUNCTION) {
1795                         builtin_kind_t builtin = entity->function.btk;
1796                         if (builtin == BUILTIN_FIRM) {
1797                                 firm_builtin = true;
1798                                 firm_builtin_kind = entity->function.b.firm_builtin_kind;
1799                         } else if (builtin != BUILTIN_NONE && builtin != BUILTIN_LIBC
1800                                    && builtin != BUILTIN_LIBC_CHECK) {
1801                                 return process_builtin_call(call);
1802                         }
1803                 }
1804         }
1805         if (!firm_builtin)
1806                 callee = expression_to_firm(function);
1807
1808         type_t *type = skip_typeref(function->base.type);
1809         assert(is_type_pointer(type));
1810         pointer_type_t *pointer_type = &type->pointer;
1811         type_t         *points_to    = skip_typeref(pointer_type->points_to);
1812         assert(is_type_function(points_to));
1813         function_type_t *function_type = &points_to->function;
1814
1815         int      n_parameters    = 0;
1816         ir_type *ir_method_type  = get_ir_type((type_t*) function_type);
1817         ir_type *new_method_type = NULL;
1818         if (function_type->variadic || function_type->unspecified_parameters) {
1819                 const call_argument_t *argument = call->arguments;
1820                 for ( ; argument != NULL; argument = argument->next) {
1821                         ++n_parameters;
1822                 }
1823
1824                 /* we need to construct a new method type matching the call
1825                  * arguments... */
1826                 type_dbg_info *tdbgi = get_type_dbg_info_((const type_t*) function_type);
1827                 int n_res       = get_method_n_ress(ir_method_type);
1828                 new_method_type = new_d_type_method(n_parameters, n_res, tdbgi);
1829                 set_method_calling_convention(new_method_type,
1830                                get_method_calling_convention(ir_method_type));
1831                 set_method_additional_properties(new_method_type,
1832                                get_method_additional_properties(ir_method_type));
1833                 set_method_variadicity(new_method_type,
1834                                        get_method_variadicity(ir_method_type));
1835
1836                 for (int i = 0; i < n_res; ++i) {
1837                         set_method_res_type(new_method_type, i,
1838                                             get_method_res_type(ir_method_type, i));
1839                 }
1840                 argument = call->arguments;
1841                 for (int i = 0; i < n_parameters; ++i, argument = argument->next) {
1842                         expression_t *expression = argument->expression;
1843                         ir_type      *irtype     = get_ir_type(expression->base.type);
1844                         set_method_param_type(new_method_type, i, irtype);
1845                 }
1846                 ir_method_type = new_method_type;
1847         } else {
1848                 n_parameters = get_method_n_params(ir_method_type);
1849         }
1850
1851         ir_node *in[n_parameters];
1852
1853         const call_argument_t *argument = call->arguments;
1854         for (int n = 0; n < n_parameters; ++n) {
1855                 expression_t *expression = argument->expression;
1856                 ir_node      *arg_node   = expression_to_firm(expression);
1857
1858                 type_t *arg_type = skip_typeref(expression->base.type);
1859                 if (!is_type_compound(arg_type)) {
1860                         ir_mode *mode = get_ir_mode_storage(expression->base.type);
1861                         arg_node      = create_conv(dbgi, arg_node, mode);
1862                         arg_node      = do_strict_conv(dbgi, arg_node);
1863                 }
1864
1865                 in[n] = arg_node;
1866
1867                 argument = argument->next;
1868         }
1869
1870         ir_node *store;
1871         if (function_type->modifiers & DM_CONST) {
1872                 store = get_irg_no_mem(current_ir_graph);
1873         } else {
1874                 store = get_store();
1875         }
1876
1877         ir_node *node;
1878         type_t  *return_type = skip_typeref(function_type->return_type);
1879         ir_node *result      = NULL;
1880         if (firm_builtin) {
1881                 node = new_d_Builtin(dbgi, store, n_parameters, in, firm_builtin_kind,
1882                                      ir_method_type);
1883                 if (! (function_type->modifiers & DM_CONST)) {
1884                         ir_node *mem = new_Proj(node, mode_M, pn_Builtin_M);
1885                         set_store(mem);
1886                 }
1887
1888                 if (!is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
1889                         assert(is_type_scalar(return_type));
1890                         ir_mode *mode = get_ir_mode_storage(return_type);
1891                         result = new_Proj(node, mode, pn_Builtin_1_result);
1892                         ir_mode *mode_arith = get_ir_mode_arithmetic(return_type);
1893                         result              = create_conv(NULL, result, mode_arith);
1894                 }
1895         } else {
1896                 node = new_d_Call(dbgi, store, callee, n_parameters, in, ir_method_type);
1897                 if (! (function_type->modifiers & DM_CONST)) {
1898                         ir_node *mem = new_Proj(node, mode_M, pn_Call_M);
1899                         set_store(mem);
1900                 }
1901
1902                 if (!is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
1903                         ir_node *resproj = new_Proj(node, mode_T, pn_Call_T_result);
1904
1905                         if (is_type_scalar(return_type)) {
1906                                 ir_mode *mode       = get_ir_mode_storage(return_type);
1907                                 result              = new_Proj(resproj, mode, 0);
1908                                 ir_mode *mode_arith = get_ir_mode_arithmetic(return_type);
1909                                 result              = create_conv(NULL, result, mode_arith);
1910                         } else {
1911                                 ir_mode *mode = mode_P_data;
1912                                 result        = new_Proj(resproj, mode, 0);
1913                         }
1914                 }
1915         }
1916
1917         if (function_type->modifiers & DM_NORETURN) {
1918                 /* A dead end:  Keep the Call and the Block.  Also place all further
1919                  * nodes into a new and unreachable block. */
1920                 keep_alive(node);
1921                 keep_alive(get_cur_block());
1922                 ir_node *block = new_Block(0, NULL);
1923                 set_cur_block(block);
1924         }
1925
1926         return result;
1927 }
1928
1929 static void statement_to_firm(statement_t *statement);
1930 static ir_node *compound_statement_to_firm(compound_statement_t *compound);
1931
1932 static ir_node *expression_to_addr(const expression_t *expression);
1933 static ir_node *create_condition_evaluation(const expression_t *expression,
1934                                             ir_node *true_block,
1935                                             ir_node *false_block);
1936
1937 static void assign_value(dbg_info *dbgi, ir_node *addr, type_t *type,
1938                          ir_node *value)
1939 {
1940         if (!is_type_compound(type)) {
1941                 ir_mode *mode = get_ir_mode_storage(type);
1942                 value         = create_conv(dbgi, value, mode);
1943                 value         = do_strict_conv(dbgi, value);
1944         }
1945
1946         ir_node *memory = get_store();
1947
1948         if (is_type_scalar(type)) {
1949                 ir_cons_flags flags = type->base.qualifiers & TYPE_QUALIFIER_VOLATILE
1950                                       ? cons_volatile : cons_none;
1951                 ir_node  *store     = new_d_Store(dbgi, memory, addr, value, flags);
1952                 ir_node  *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
1953                 set_store(store_mem);
1954         } else {
1955                 ir_type *irtype    = get_ir_type(type);
1956                 ir_node *copyb     = new_d_CopyB(dbgi, memory, addr, value, irtype);
1957                 ir_node *copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
1958                 set_store(copyb_mem);
1959         }
1960 }
1961
1962 static ir_tarval *create_bitfield_mask(ir_mode *mode, int offset, int size)
1963 {
1964         ir_tarval *all_one   = get_mode_all_one(mode);
1965         int        mode_size = get_mode_size_bits(mode);
1966
1967         assert(offset >= 0);
1968         assert(size   >= 0);
1969         assert(offset + size <= mode_size);
1970         if (size == mode_size) {
1971                 return all_one;
1972         }
1973
1974         long       shiftr    = get_mode_size_bits(mode) - size;
1975         long       shiftl    = offset;
1976         ir_tarval *tv_shiftr = new_tarval_from_long(shiftr, mode_uint);
1977         ir_tarval *tv_shiftl = new_tarval_from_long(shiftl, mode_uint);
1978         ir_tarval *mask0     = tarval_shr(all_one, tv_shiftr);
1979         ir_tarval *mask1     = tarval_shl(mask0, tv_shiftl);
1980
1981         return mask1;
1982 }
1983
1984 static ir_node *bitfield_store_to_firm(dbg_info *dbgi,
1985                 ir_entity *entity, ir_node *addr, ir_node *value, bool set_volatile)
1986 {
1987         ir_type *entity_type = get_entity_type(entity);
1988         ir_type *base_type   = get_primitive_base_type(entity_type);
1989         assert(base_type != NULL);
1990         ir_mode *mode        = get_type_mode(base_type);
1991
1992         value = create_conv(dbgi, value, mode);
1993
1994         /* kill upper bits of value and shift to right position */
1995         int        bitoffset       = get_entity_offset_bits_remainder(entity);
1996         int        bitsize         = get_mode_size_bits(get_type_mode(entity_type));
1997         ir_tarval *mask            = create_bitfield_mask(mode, 0, bitsize);
1998         ir_node   *mask_node       = new_d_Const(dbgi, mask);
1999         ir_node   *value_masked    = new_d_And(dbgi, value, mask_node, mode);
2000         ir_tarval *shiftl          = new_tarval_from_long(bitoffset, mode_uint);
2001         ir_node   *shiftcount      = new_d_Const(dbgi, shiftl);
2002         ir_node   *value_maskshift = new_d_Shl(dbgi, value_masked, shiftcount, mode);
2003
2004         /* load current value */
2005         ir_node   *mem             = get_store();
2006         ir_node   *load            = new_d_Load(dbgi, mem, addr, mode,
2007                                           set_volatile ? cons_volatile : cons_none);
2008         ir_node   *load_mem        = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
2009         ir_node   *load_res        = new_d_Proj(dbgi, load, mode, pn_Load_res);
2010         ir_tarval *shift_mask      = create_bitfield_mask(mode, bitoffset, bitsize);
2011         ir_tarval *inv_mask        = tarval_not(shift_mask);
2012         ir_node   *inv_mask_node   = new_d_Const(dbgi, inv_mask);
2013         ir_node   *load_res_masked = new_d_And(dbgi, load_res, inv_mask_node, mode);
2014
2015         /* construct new value and store */
2016         ir_node *new_val   = new_d_Or(dbgi, load_res_masked, value_maskshift, mode);
2017         ir_node *store     = new_d_Store(dbgi, load_mem, addr, new_val,
2018                                          set_volatile ? cons_volatile : cons_none);
2019         ir_node *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
2020         set_store(store_mem);
2021
2022         return value_masked;
2023 }
2024
2025 static ir_node *bitfield_extract_to_firm(const select_expression_t *expression,
2026                                          ir_node *addr)
2027 {
2028         dbg_info *dbgi      = get_dbg_info(&expression->base.source_position);
2029         entity_t *entity    = expression->compound_entry;
2030         type_t   *base_type = entity->declaration.type;
2031         ir_mode  *mode      = get_ir_mode_storage(base_type);
2032         ir_node  *mem       = get_store();
2033         ir_node  *load      = new_d_Load(dbgi, mem, addr, mode, cons_none);
2034         ir_node  *load_mem  = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
2035         ir_node  *load_res  = new_d_Proj(dbgi, load, mode, pn_Load_res);
2036
2037         ir_mode  *amode     = mode;
2038         /* optimisation, since shifting in modes < machine_size is usually
2039          * less efficient */
2040         if (get_mode_size_bits(amode) < get_mode_size_bits(mode_uint)) {
2041                 amode = mode_uint;
2042         }
2043         unsigned amode_size = get_mode_size_bits(amode);
2044         load_res = create_conv(dbgi, load_res, amode);
2045
2046         set_store(load_mem);
2047
2048         /* kill upper bits */
2049         assert(expression->compound_entry->kind == ENTITY_COMPOUND_MEMBER);
2050         int        bitoffset   = entity->compound_member.bit_offset;
2051         int        bitsize     = entity->compound_member.bit_size;
2052         unsigned   shift_bitsl = amode_size - bitoffset - bitsize;
2053         ir_tarval *tvl         = new_tarval_from_long((long)shift_bitsl, mode_uint);
2054         ir_node   *countl      = new_d_Const(dbgi, tvl);
2055         ir_node   *shiftl      = new_d_Shl(dbgi, load_res, countl, amode);
2056
2057         unsigned   shift_bitsr = bitoffset + shift_bitsl;
2058         assert(shift_bitsr <= amode_size);
2059         ir_tarval *tvr         = new_tarval_from_long((long)shift_bitsr, mode_uint);
2060         ir_node   *countr      = new_d_Const(dbgi, tvr);
2061         ir_node   *shiftr;
2062         if (mode_is_signed(mode)) {
2063                 shiftr = new_d_Shrs(dbgi, shiftl, countr, amode);
2064         } else {
2065                 shiftr = new_d_Shr(dbgi, shiftl, countr, amode);
2066         }
2067
2068         type_t  *type    = expression->base.type;
2069         ir_mode *resmode = get_ir_mode_arithmetic(type);
2070         return create_conv(dbgi, shiftr, resmode);
2071 }
2072
2073 /* make sure the selected compound type is constructed */
2074 static void construct_select_compound(const select_expression_t *expression)
2075 {
2076         type_t *type = skip_typeref(expression->compound->base.type);
2077         if (is_type_pointer(type)) {
2078                 type = type->pointer.points_to;
2079         }
2080         (void) get_ir_type(type);
2081 }
2082
2083 static ir_node *set_value_for_expression_addr(const expression_t *expression,
2084                                               ir_node *value, ir_node *addr)
2085 {
2086         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2087         type_t   *type = skip_typeref(expression->base.type);
2088
2089         if (!is_type_compound(type)) {
2090                 ir_mode  *mode = get_ir_mode_storage(type);
2091                 value          = create_conv(dbgi, value, mode);
2092                 value          = do_strict_conv(dbgi, value);
2093         }
2094
2095         if (expression->kind == EXPR_REFERENCE) {
2096                 const reference_expression_t *ref = &expression->reference;
2097
2098                 entity_t *entity = ref->entity;
2099                 assert(is_declaration(entity));
2100                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2101                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE) {
2102                         set_value(entity->variable.v.value_number, value);
2103                         return value;
2104                 } else if (entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
2105                         set_value(entity->parameter.v.value_number, value);
2106                         return value;
2107                 }
2108         }
2109
2110         if (addr == NULL)
2111                 addr = expression_to_addr(expression);
2112         assert(addr != NULL);
2113
2114         if (expression->kind == EXPR_SELECT) {
2115                 const select_expression_t *select = &expression->select;
2116
2117                 construct_select_compound(select);
2118
2119                 entity_t *entity = select->compound_entry;
2120                 assert(entity->kind == ENTITY_COMPOUND_MEMBER);
2121                 if (entity->compound_member.bitfield) {
2122                         ir_entity *irentity = entity->compound_member.entity;
2123                         bool       set_volatile
2124                                 = select->base.type->base.qualifiers & TYPE_QUALIFIER_VOLATILE;
2125                         value = bitfield_store_to_firm(dbgi, irentity, addr, value,
2126                                                        set_volatile);
2127                         return value;
2128                 }
2129         }
2130
2131         assign_value(dbgi, addr, type, value);
2132         return value;
2133 }
2134
2135 static void set_value_for_expression(const expression_t *expression,
2136                                      ir_node *value)
2137 {
2138         set_value_for_expression_addr(expression, value, NULL);
2139 }
2140
2141 static ir_node *get_value_from_lvalue(const expression_t *expression,
2142                                       ir_node *addr)
2143 {
2144         if (expression->kind == EXPR_REFERENCE) {
2145                 const reference_expression_t *ref = &expression->reference;
2146
2147                 entity_t *entity = ref->entity;
2148                 assert(entity->kind == ENTITY_VARIABLE
2149                                 || entity->kind == ENTITY_PARAMETER);
2150                 assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2151                 int value_number;
2152                 if (entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE) {
2153                         value_number = entity->variable.v.value_number;
2154                         assert(addr == NULL);
2155                         type_t  *type = skip_typeref(expression->base.type);
2156                         ir_mode *mode = get_ir_mode_storage(type);
2157                         ir_node *res  = get_value(value_number, mode);
2158                         return create_conv(NULL, res, get_ir_mode_arithmetic(type));
2159                 } else if (entity->declaration.kind == DECLARATION_KIND_PARAMETER) {
2160                         value_number = entity->parameter.v.value_number;
2161                         assert(addr == NULL);
2162                         type_t  *type = skip_typeref(expression->base.type);
2163                         ir_mode *mode = get_ir_mode_storage(type);
2164                         ir_node *res  = get_value(value_number, mode);
2165                         return create_conv(NULL, res, get_ir_mode_arithmetic(type));
2166                 }
2167         }
2168
2169         assert(addr != NULL);
2170         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2171
2172         ir_node *value;
2173         if (expression->kind == EXPR_SELECT &&
2174             expression->select.compound_entry->compound_member.bitfield) {
2175             construct_select_compound(&expression->select);
2176                 value = bitfield_extract_to_firm(&expression->select, addr);
2177         } else {
2178                 value = deref_address(dbgi, expression->base.type, addr);
2179         }
2180
2181         return value;
2182 }
2183
2184
2185 static ir_node *create_incdec(const unary_expression_t *expression)
2186 {
2187         dbg_info *const     dbgi = get_dbg_info(&expression->base.source_position);
2188         const expression_t *value_expr = expression->value;
2189         ir_node            *addr       = expression_to_addr(value_expr);
2190         ir_node            *value      = get_value_from_lvalue(value_expr, addr);
2191
2192         type_t  *type = skip_typeref(expression->base.type);
2193         ir_mode *mode = get_ir_mode_arithmetic(expression->base.type);
2194
2195         ir_node *offset;
2196         if (is_type_pointer(type)) {
2197                 pointer_type_t *pointer_type = &type->pointer;
2198                 offset = get_type_size_node(pointer_type->points_to);
2199         } else {
2200                 assert(is_type_arithmetic(type));
2201                 offset = new_Const(get_mode_one(mode));
2202         }
2203
2204         ir_node *result;
2205         ir_node *store_value;
2206         switch(expression->base.kind) {
2207         case EXPR_UNARY_POSTFIX_INCREMENT:
2208                 result      = value;
2209                 store_value = new_d_Add(dbgi, value, offset, mode);
2210                 break;
2211         case EXPR_UNARY_POSTFIX_DECREMENT:
2212                 result      = value;
2213                 store_value = new_d_Sub(dbgi, value, offset, mode);
2214                 break;
2215         case EXPR_UNARY_PREFIX_INCREMENT:
2216                 result      = new_d_Add(dbgi, value, offset, mode);
2217                 store_value = result;
2218                 break;
2219         case EXPR_UNARY_PREFIX_DECREMENT:
2220                 result      = new_d_Sub(dbgi, value, offset, mode);
2221                 store_value = result;
2222                 break;
2223         default:
2224                 panic("no incdec expr in create_incdec");
2225         }
2226
2227         set_value_for_expression_addr(value_expr, store_value, addr);
2228
2229         return result;
2230 }
2231
2232 static bool is_local_variable(expression_t *expression)
2233 {
2234         if (expression->kind != EXPR_REFERENCE)
2235                 return false;
2236         reference_expression_t *ref_expr = &expression->reference;
2237         entity_t               *entity   = ref_expr->entity;
2238         if (entity->kind != ENTITY_VARIABLE)
2239                 return false;
2240         assert(entity->declaration.kind != DECLARATION_KIND_UNKNOWN);
2241         return entity->declaration.kind == DECLARATION_KIND_LOCAL_VARIABLE;
2242 }
2243
2244 static ir_relation get_relation(const expression_kind_t kind)
2245 {
2246         switch(kind) {
2247         case EXPR_BINARY_EQUAL:         return ir_relation_equal;
2248         case EXPR_BINARY_ISLESSGREATER: return ir_relation_less_greater;
2249         case EXPR_BINARY_NOTEQUAL:      return ir_relation_unordered_less_greater;
2250         case EXPR_BINARY_ISLESS:
2251         case EXPR_BINARY_LESS:          return ir_relation_less;
2252         case EXPR_BINARY_ISLESSEQUAL:
2253         case EXPR_BINARY_LESSEQUAL:     return ir_relation_less_equal;
2254         case EXPR_BINARY_ISGREATER:
2255         case EXPR_BINARY_GREATER:       return ir_relation_greater;
2256         case EXPR_BINARY_ISGREATEREQUAL:
2257         case EXPR_BINARY_GREATEREQUAL:  return ir_relation_greater_equal;
2258         case EXPR_BINARY_ISUNORDERED:   return ir_relation_unordered;
2259
2260         default:
2261                 break;
2262         }
2263         panic("trying to get pn_Cmp from non-comparison binexpr type");
2264 }
2265
2266 /**
2267  * Handle the assume optimizer hint: check if a Confirm
2268  * node can be created.
2269  *
2270  * @param dbi    debug info
2271  * @param expr   the IL assume expression
2272  *
2273  * we support here only some simple cases:
2274  *  - var rel const
2275  *  - const rel val
2276  *  - var rel var
2277  */
2278 static ir_node *handle_assume_compare(dbg_info *dbi,
2279                                       const binary_expression_t *expression)
2280 {
2281         expression_t *op1 = expression->left;
2282         expression_t *op2 = expression->right;
2283         entity_t     *var2, *var = NULL;
2284         ir_node      *res      = NULL;
2285         ir_relation   relation = get_relation(expression->base.kind);
2286
2287         if (is_local_variable(op1) && is_local_variable(op2)) {
2288                 var  = op1->reference.entity;
2289             var2 = op2->reference.entity;
2290
2291                 type_t  *const type = skip_typeref(var->declaration.type);
2292                 ir_mode *const mode = get_ir_mode_storage(type);
2293
2294                 ir_node *const irn1 = get_value(var->variable.v.value_number, mode);
2295                 ir_node *const irn2 = get_value(var2->variable.v.value_number, mode);
2296
2297                 res = new_d_Confirm(dbi, irn2, irn1, get_inversed_relation(relation));
2298                 set_value(var2->variable.v.value_number, res);
2299
2300                 res = new_d_Confirm(dbi, irn1, irn2, relation);
2301                 set_value(var->variable.v.value_number, res);
2302
2303                 return res;
2304         }
2305
2306         expression_t *con = NULL;
2307         if (is_local_variable(op1) && is_constant_expression(op2) == EXPR_CLASS_CONSTANT) {
2308                 var = op1->reference.entity;
2309                 con = op2;
2310         } else if (is_constant_expression(op1) == EXPR_CLASS_CONSTANT && is_local_variable(op2)) {
2311                 relation = get_inversed_relation(relation);
2312                 var = op2->reference.entity;
2313                 con = op1;
2314         }
2315
2316         if (var != NULL) {
2317                 type_t  *const type = skip_typeref(var->declaration.type);
2318                 ir_mode *const mode = get_ir_mode_storage(type);
2319
2320                 res = get_value(var->variable.v.value_number, mode);
2321                 res = new_d_Confirm(dbi, res, expression_to_firm(con), relation);
2322                 set_value(var->variable.v.value_number, res);
2323         }
2324         return res;
2325 }
2326
2327 /**
2328  * Handle the assume optimizer hint.
2329  *
2330  * @param dbi    debug info
2331  * @param expr   the IL assume expression
2332  */
2333 static ir_node *handle_assume(dbg_info *dbi, const expression_t *expression)
2334 {
2335         switch(expression->kind) {
2336         case EXPR_BINARY_EQUAL:
2337         case EXPR_BINARY_NOTEQUAL:
2338         case EXPR_BINARY_LESS:
2339         case EXPR_BINARY_LESSEQUAL:
2340         case EXPR_BINARY_GREATER:
2341         case EXPR_BINARY_GREATEREQUAL:
2342                 return handle_assume_compare(dbi, &expression->binary);
2343         default:
2344                 return NULL;
2345         }
2346 }
2347
2348 static ir_node *create_cast(dbg_info *dbgi, ir_node *value_node,
2349                             type_t *from_type, type_t *type)
2350 {
2351         type = skip_typeref(type);
2352         if (type == type_void) {
2353                 /* make sure firm type is constructed */
2354                 (void) get_ir_type(type);
2355                 return NULL;
2356         }
2357         if (!is_type_scalar(type)) {
2358                 /* make sure firm type is constructed */
2359                 (void) get_ir_type(type);
2360                 return value_node;
2361         }
2362
2363         from_type     = skip_typeref(from_type);
2364         ir_mode *mode = get_ir_mode_storage(type);
2365         /* check for conversion from / to __based types */
2366         if (is_type_pointer(type) && is_type_pointer(from_type)) {
2367                 const variable_t *from_var = from_type->pointer.base_variable;
2368                 const variable_t *to_var   = type->pointer.base_variable;
2369                 if (from_var != to_var) {
2370                         if (from_var != NULL) {
2371                                 ir_node *const addr = create_symconst(dbgi, from_var->v.entity);
2372                                 ir_node *const base = deref_address(dbgi, from_var->base.type, addr);
2373                                 value_node = new_d_Add(dbgi, value_node, base, get_ir_mode_storage(from_type));
2374                         }
2375                         if (to_var != NULL) {
2376                                 ir_node *const addr = create_symconst(dbgi, to_var->v.entity);
2377                                 ir_node *const base = deref_address(dbgi, to_var->base.type, addr);
2378                                 value_node = new_d_Sub(dbgi, value_node, base, mode);
2379                         }
2380                 }
2381         }
2382
2383         if (is_type_atomic(type, ATOMIC_TYPE_BOOL)) {
2384                 /* bool adjustments (we save a mode_Bu, but have to temporarily
2385                  * convert to mode_b so we only get a 0/1 value */
2386                 value_node = create_conv(dbgi, value_node, mode_b);
2387         }
2388
2389         ir_mode *mode_arith = get_ir_mode_arithmetic(type);
2390         ir_node *node       = create_conv(dbgi, value_node, mode);
2391         node                = do_strict_conv(dbgi, node);
2392         node                = create_conv(dbgi, node, mode_arith);
2393
2394         return node;
2395 }
2396
2397 static ir_node *unary_expression_to_firm(const unary_expression_t *expression)
2398 {
2399         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2400         type_t   *type = skip_typeref(expression->base.type);
2401
2402         if (expression->base.kind == EXPR_UNARY_TAKE_ADDRESS)
2403                 return expression_to_addr(expression->value);
2404
2405         const expression_t *value = expression->value;
2406
2407         switch(expression->base.kind) {
2408         case EXPR_UNARY_NEGATE: {
2409                 ir_node *value_node = expression_to_firm(value);
2410                 ir_mode *mode       = get_ir_mode_arithmetic(type);
2411                 return new_d_Minus(dbgi, value_node, mode);
2412         }
2413         case EXPR_UNARY_PLUS:
2414                 return expression_to_firm(value);
2415         case EXPR_UNARY_BITWISE_NEGATE: {
2416                 ir_node *value_node = expression_to_firm(value);
2417                 ir_mode *mode       = get_ir_mode_arithmetic(type);
2418                 return new_d_Not(dbgi, value_node, mode);
2419         }
2420         case EXPR_UNARY_NOT: {
2421                 ir_node *value_node = _expression_to_firm(value);
2422                 value_node          = create_conv(dbgi, value_node, mode_b);
2423                 ir_node *res        = new_d_Not(dbgi, value_node, mode_b);
2424                 return res;
2425         }
2426         case EXPR_UNARY_DEREFERENCE: {
2427                 ir_node *value_node = expression_to_firm(value);
2428                 type_t  *value_type = skip_typeref(value->base.type);
2429                 assert(is_type_pointer(value_type));
2430
2431                 /* check for __based */
2432                 const variable_t *const base_var = value_type->pointer.base_variable;
2433                 if (base_var != NULL) {
2434                         ir_node *const addr = create_symconst(dbgi, base_var->v.entity);
2435                         ir_node *const base = deref_address(dbgi, base_var->base.type, addr);
2436                         value_node = new_d_Add(dbgi, value_node, base, get_ir_mode_storage(value_type));
2437                 }
2438                 type_t  *points_to  = value_type->pointer.points_to;
2439                 return deref_address(dbgi, points_to, value_node);
2440         }
2441         case EXPR_UNARY_POSTFIX_INCREMENT:
2442         case EXPR_UNARY_POSTFIX_DECREMENT:
2443         case EXPR_UNARY_PREFIX_INCREMENT:
2444         case EXPR_UNARY_PREFIX_DECREMENT:
2445                 return create_incdec(expression);
2446         case EXPR_UNARY_CAST: {
2447                 ir_node *value_node = expression_to_firm(value);
2448                 type_t  *from_type  = value->base.type;
2449                 return create_cast(dbgi, value_node, from_type, type);
2450         }
2451         case EXPR_UNARY_ASSUME:
2452                 return handle_assume(dbgi, value);
2453
2454         default:
2455                 break;
2456         }
2457         panic("invalid UNEXPR type found");
2458 }
2459
2460 /**
2461  * produces a 0/1 depending of the value of a mode_b node
2462  */
2463 static ir_node *produce_condition_result(const expression_t *expression,
2464                                          ir_mode *mode, dbg_info *dbgi)
2465 {
2466         ir_node *const one_block  = new_immBlock();
2467         ir_node *const zero_block = new_immBlock();
2468         create_condition_evaluation(expression, one_block, zero_block);
2469         mature_immBlock(one_block);
2470         mature_immBlock(zero_block);
2471
2472         ir_node *const jmp_one  = new_rd_Jmp(dbgi, one_block);
2473         ir_node *const jmp_zero = new_rd_Jmp(dbgi, zero_block);
2474         ir_node *const in_cf[2] = { jmp_one, jmp_zero };
2475         ir_node *const block    = new_Block(lengthof(in_cf), in_cf);
2476         set_cur_block(block);
2477
2478         ir_node *const one   = new_Const(get_mode_one(mode));
2479         ir_node *const zero  = new_Const(get_mode_null(mode));
2480         ir_node *const in[2] = { one, zero };
2481         ir_node *const val   = new_d_Phi(dbgi, lengthof(in), in, mode);
2482
2483         return val;
2484 }
2485
2486 static ir_node *adjust_for_pointer_arithmetic(dbg_info *dbgi,
2487                 ir_node *value, type_t *type)
2488 {
2489         ir_mode        *const mode         = get_ir_mode_arithmetic(type_ptrdiff_t);
2490         assert(is_type_pointer(type));
2491         pointer_type_t *const pointer_type = &type->pointer;
2492         type_t         *const points_to    = skip_typeref(pointer_type->points_to);
2493         ir_node        *      elem_size    = get_type_size_node(points_to);
2494         elem_size                          = create_conv(dbgi, elem_size, mode);
2495         value                              = create_conv(dbgi, value,     mode);
2496         ir_node        *const mul          = new_d_Mul(dbgi, value, elem_size, mode);
2497         return mul;
2498 }
2499
2500 static ir_node *create_op(dbg_info *dbgi, const binary_expression_t *expression,
2501                           ir_node *left, ir_node *right)
2502 {
2503         ir_mode  *mode;
2504         type_t   *type_left  = skip_typeref(expression->left->base.type);
2505         type_t   *type_right = skip_typeref(expression->right->base.type);
2506
2507         expression_kind_t kind = expression->base.kind;
2508
2509         switch (kind) {
2510         case EXPR_BINARY_SHIFTLEFT:
2511         case EXPR_BINARY_SHIFTRIGHT:
2512         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2513         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2514                 mode  = get_ir_mode_arithmetic(expression->base.type);
2515                 right = create_conv(dbgi, right, mode_uint);
2516                 break;
2517
2518         case EXPR_BINARY_SUB:
2519                 if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
2520                         const pointer_type_t *const ptr_type = &type_left->pointer;
2521
2522                         mode = get_ir_mode_arithmetic(expression->base.type);
2523                         ir_node *const elem_size = get_type_size_node(ptr_type->points_to);
2524                         ir_node *const conv_size = new_d_Conv(dbgi, elem_size, mode);
2525                         ir_node *const sub       = new_d_Sub(dbgi, left, right, mode);
2526                         ir_node *const no_mem    = new_NoMem();
2527                         ir_node *const div       = new_d_DivRL(dbgi, no_mem, sub, conv_size,
2528                                                                                                    mode, op_pin_state_floats);
2529                         return new_d_Proj(dbgi, div, mode, pn_Div_res);
2530                 }
2531                 /* fallthrough */
2532         case EXPR_BINARY_SUB_ASSIGN:
2533                 if (is_type_pointer(type_left)) {
2534                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2535                         mode  = get_ir_mode_arithmetic(type_left);
2536                         break;
2537                 }
2538                 goto normal_node;
2539
2540         case EXPR_BINARY_ADD:
2541         case EXPR_BINARY_ADD_ASSIGN:
2542                 if (is_type_pointer(type_left)) {
2543                         right = adjust_for_pointer_arithmetic(dbgi, right, type_left);
2544                         mode  = get_ir_mode_arithmetic(type_left);
2545                         break;
2546                 } else if (is_type_pointer(type_right)) {
2547                         left  = adjust_for_pointer_arithmetic(dbgi, left, type_right);
2548                         mode  = get_ir_mode_arithmetic(type_right);
2549                         break;
2550                 }
2551                 goto normal_node;
2552
2553         default:
2554 normal_node:
2555                 mode = get_ir_mode_arithmetic(type_right);
2556                 left = create_conv(dbgi, left, mode);
2557                 break;
2558         }
2559
2560         switch (kind) {
2561         case EXPR_BINARY_ADD_ASSIGN:
2562         case EXPR_BINARY_ADD:
2563                 return new_d_Add(dbgi, left, right, mode);
2564         case EXPR_BINARY_SUB_ASSIGN:
2565         case EXPR_BINARY_SUB:
2566                 return new_d_Sub(dbgi, left, right, mode);
2567         case EXPR_BINARY_MUL_ASSIGN:
2568         case EXPR_BINARY_MUL:
2569                 return new_d_Mul(dbgi, left, right, mode);
2570         case EXPR_BINARY_BITWISE_AND:
2571         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2572                 return new_d_And(dbgi, left, right, mode);
2573         case EXPR_BINARY_BITWISE_OR:
2574         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2575                 return new_d_Or(dbgi, left, right, mode);
2576         case EXPR_BINARY_BITWISE_XOR:
2577         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2578                 return new_d_Eor(dbgi, left, right, mode);
2579         case EXPR_BINARY_SHIFTLEFT:
2580         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2581                 return new_d_Shl(dbgi, left, right, mode);
2582         case EXPR_BINARY_SHIFTRIGHT:
2583         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2584                 if (mode_is_signed(mode)) {
2585                         return new_d_Shrs(dbgi, left, right, mode);
2586                 } else {
2587                         return new_d_Shr(dbgi, left, right, mode);
2588                 }
2589         case EXPR_BINARY_DIV:
2590         case EXPR_BINARY_DIV_ASSIGN: {
2591                 ir_node *pin = new_Pin(new_NoMem());
2592                 ir_node *op  = new_d_Div(dbgi, pin, left, right, mode,
2593                                          op_pin_state_floats);
2594                 ir_node *res = new_d_Proj(dbgi, op, mode, pn_Div_res);
2595                 return res;
2596         }
2597         case EXPR_BINARY_MOD:
2598         case EXPR_BINARY_MOD_ASSIGN: {
2599                 ir_node *pin = new_Pin(new_NoMem());
2600                 assert(!mode_is_float(mode));
2601                 ir_node *op  = new_d_Mod(dbgi, pin, left, right, mode,
2602                                          op_pin_state_floats);
2603                 ir_node *res = new_d_Proj(dbgi, op, mode, pn_Mod_res);
2604                 return res;
2605         }
2606         default:
2607                 panic("unexpected expression kind");
2608         }
2609 }
2610
2611 static ir_node *create_lazy_op(const binary_expression_t *expression)
2612 {
2613         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
2614         type_t   *type = skip_typeref(expression->base.type);
2615         ir_mode  *mode = get_ir_mode_arithmetic(type);
2616
2617         if (is_constant_expression(expression->left) == EXPR_CLASS_CONSTANT) {
2618                 bool val = fold_constant_to_bool(expression->left);
2619                 expression_kind_t ekind = expression->base.kind;
2620                 assert(ekind == EXPR_BINARY_LOGICAL_AND || ekind == EXPR_BINARY_LOGICAL_OR);
2621                 if (ekind == EXPR_BINARY_LOGICAL_AND) {
2622                         if (!val) {
2623                                 return new_Const(get_mode_null(mode));
2624                         }
2625                 } else {
2626                         if (val) {
2627                                 return new_Const(get_mode_one(mode));
2628                         }
2629                 }
2630
2631                 if (is_constant_expression(expression->right) == EXPR_CLASS_CONSTANT) {
2632                         bool valr = fold_constant_to_bool(expression->right);
2633                         return create_Const_from_bool(mode, valr);
2634                 }
2635
2636                 return produce_condition_result(expression->right, mode, dbgi);
2637         }
2638
2639         return produce_condition_result((const expression_t*) expression, mode,
2640                                         dbgi);
2641 }
2642
2643 typedef ir_node * (*create_arithmetic_func)(dbg_info *dbgi, ir_node *left,
2644                                             ir_node *right, ir_mode *mode);
2645
2646 static ir_node *create_assign_binop(const binary_expression_t *expression)
2647 {
2648         dbg_info *const     dbgi = get_dbg_info(&expression->base.source_position);
2649         const expression_t *left_expr = expression->left;
2650         type_t             *type      = skip_typeref(left_expr->base.type);
2651         ir_node            *right     = expression_to_firm(expression->right);
2652         ir_node            *left_addr = expression_to_addr(left_expr);
2653         ir_node            *left      = get_value_from_lvalue(left_expr, left_addr);
2654         ir_node            *result    = create_op(dbgi, expression, left, right);
2655
2656         result = create_cast(dbgi, result, expression->right->base.type, type);
2657         result = do_strict_conv(dbgi, result);
2658
2659         result = set_value_for_expression_addr(left_expr, result, left_addr);
2660
2661         if (!is_type_compound(type)) {
2662                 ir_mode *mode_arithmetic = get_ir_mode_arithmetic(type);
2663                 result = create_conv(dbgi, result, mode_arithmetic);
2664         }
2665         return result;
2666 }
2667
2668 static ir_node *binary_expression_to_firm(const binary_expression_t *expression)
2669 {
2670         expression_kind_t kind = expression->base.kind;
2671
2672         switch(kind) {
2673         case EXPR_BINARY_EQUAL:
2674         case EXPR_BINARY_NOTEQUAL:
2675         case EXPR_BINARY_LESS:
2676         case EXPR_BINARY_LESSEQUAL:
2677         case EXPR_BINARY_GREATER:
2678         case EXPR_BINARY_GREATEREQUAL:
2679         case EXPR_BINARY_ISGREATER:
2680         case EXPR_BINARY_ISGREATEREQUAL:
2681         case EXPR_BINARY_ISLESS:
2682         case EXPR_BINARY_ISLESSEQUAL:
2683         case EXPR_BINARY_ISLESSGREATER:
2684         case EXPR_BINARY_ISUNORDERED: {
2685                 dbg_info   *dbgi     = get_dbg_info(&expression->base.source_position);
2686                 ir_node    *left     = expression_to_firm(expression->left);
2687                 ir_node    *right    = expression_to_firm(expression->right);
2688                 ir_relation relation = get_relation(kind);
2689                 ir_node    *cmp      = new_d_Cmp(dbgi, left, right, relation);
2690                 return cmp;
2691         }
2692         case EXPR_BINARY_ASSIGN: {
2693                 ir_node *addr  = expression_to_addr(expression->left);
2694                 ir_node *right = expression_to_firm(expression->right);
2695                 ir_node *res
2696                         = set_value_for_expression_addr(expression->left, right, addr);
2697
2698                 type_t  *type            = skip_typeref(expression->base.type);
2699                 if (!is_type_compound(type)) {
2700                         ir_mode *mode_arithmetic = get_ir_mode_arithmetic(type);
2701                         res                      = create_conv(NULL, res, mode_arithmetic);
2702                 }
2703                 return res;
2704         }
2705         case EXPR_BINARY_ADD:
2706         case EXPR_BINARY_SUB:
2707         case EXPR_BINARY_MUL:
2708         case EXPR_BINARY_DIV:
2709         case EXPR_BINARY_MOD:
2710         case EXPR_BINARY_BITWISE_AND:
2711         case EXPR_BINARY_BITWISE_OR:
2712         case EXPR_BINARY_BITWISE_XOR:
2713         case EXPR_BINARY_SHIFTLEFT:
2714         case EXPR_BINARY_SHIFTRIGHT:
2715         {
2716                 dbg_info *dbgi  = get_dbg_info(&expression->base.source_position);
2717                 ir_node  *left  = expression_to_firm(expression->left);
2718                 ir_node  *right = expression_to_firm(expression->right);
2719                 return create_op(dbgi, expression, left, right);
2720         }
2721         case EXPR_BINARY_LOGICAL_AND:
2722         case EXPR_BINARY_LOGICAL_OR:
2723                 return create_lazy_op(expression);
2724         case EXPR_BINARY_COMMA:
2725                 /* create side effects of left side */
2726                 (void) expression_to_firm(expression->left);
2727                 return _expression_to_firm(expression->right);
2728
2729         case EXPR_BINARY_ADD_ASSIGN:
2730         case EXPR_BINARY_SUB_ASSIGN:
2731         case EXPR_BINARY_MUL_ASSIGN:
2732         case EXPR_BINARY_MOD_ASSIGN:
2733         case EXPR_BINARY_DIV_ASSIGN:
2734         case EXPR_BINARY_BITWISE_AND_ASSIGN:
2735         case EXPR_BINARY_BITWISE_OR_ASSIGN:
2736         case EXPR_BINARY_BITWISE_XOR_ASSIGN:
2737         case EXPR_BINARY_SHIFTLEFT_ASSIGN:
2738         case EXPR_BINARY_SHIFTRIGHT_ASSIGN:
2739                 return create_assign_binop(expression);
2740         default:
2741                 panic("TODO binexpr type");
2742         }
2743 }
2744
2745 static ir_node *array_access_addr(const array_access_expression_t *expression)
2746 {
2747         dbg_info *dbgi        = get_dbg_info(&expression->base.source_position);
2748         ir_node  *base_addr   = expression_to_firm(expression->array_ref);
2749         ir_node  *offset      = expression_to_firm(expression->index);
2750         type_t   *ref_type    = skip_typeref(expression->array_ref->base.type);
2751         ir_node  *real_offset = adjust_for_pointer_arithmetic(dbgi, offset, ref_type);
2752         ir_node  *result      = new_d_Add(dbgi, base_addr, real_offset, mode_P_data);
2753
2754         return result;
2755 }
2756
2757 static ir_node *array_access_to_firm(
2758                 const array_access_expression_t *expression)
2759 {
2760         dbg_info *dbgi   = get_dbg_info(&expression->base.source_position);
2761         ir_node  *addr   = array_access_addr(expression);
2762         type_t   *type   = revert_automatic_type_conversion(
2763                         (const expression_t*) expression);
2764         type             = skip_typeref(type);
2765
2766         return deref_address(dbgi, type, addr);
2767 }
2768
2769 static long get_offsetof_offset(const offsetof_expression_t *expression)
2770 {
2771         type_t *orig_type = expression->type;
2772         long    offset    = 0;
2773
2774         designator_t *designator = expression->designator;
2775         for ( ; designator != NULL; designator = designator->next) {
2776                 type_t *type = skip_typeref(orig_type);
2777                 /* be sure the type is constructed */
2778                 (void) get_ir_type(type);
2779
2780                 if (designator->symbol != NULL) {
2781                         assert(is_type_compound(type));
2782                         symbol_t *symbol = designator->symbol;
2783
2784                         compound_t *compound = type->compound.compound;
2785                         entity_t   *iter     = compound->members.entities;
2786                         for ( ; iter != NULL; iter = iter->base.next) {
2787                                 if (iter->base.symbol == symbol) {
2788                                         break;
2789                                 }
2790                         }
2791                         assert(iter != NULL);
2792
2793                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
2794                         assert(iter->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
2795                         offset += get_entity_offset(iter->compound_member.entity);
2796
2797                         orig_type = iter->declaration.type;
2798                 } else {
2799                         expression_t *array_index = designator->array_index;
2800                         assert(designator->array_index != NULL);
2801                         assert(is_type_array(type));
2802
2803                         long index         = fold_constant_to_int(array_index);
2804                         ir_type *arr_type  = get_ir_type(type);
2805                         ir_type *elem_type = get_array_element_type(arr_type);
2806                         long     elem_size = get_type_size_bytes(elem_type);
2807
2808                         offset += index * elem_size;
2809
2810                         orig_type = type->array.element_type;
2811                 }
2812         }
2813
2814         return offset;
2815 }
2816
2817 static ir_node *offsetof_to_firm(const offsetof_expression_t *expression)
2818 {
2819         ir_mode   *mode   = get_ir_mode_arithmetic(expression->base.type);
2820         long       offset = get_offsetof_offset(expression);
2821         ir_tarval *tv     = new_tarval_from_long(offset, mode);
2822         dbg_info  *dbgi   = get_dbg_info(&expression->base.source_position);
2823
2824         return new_d_Const(dbgi, tv);
2825 }
2826
2827 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
2828                                      ir_entity *entity, type_t *type);
2829
2830 static ir_node *compound_literal_to_firm(
2831                 const compound_literal_expression_t *expression)
2832 {
2833         type_t *type = expression->type;
2834
2835         /* create an entity on the stack */
2836         ir_type *frame_type = get_irg_frame_type(current_ir_graph);
2837
2838         ident     *const id     = id_unique("CompLit.%u");
2839         ir_type   *const irtype = get_ir_type(type);
2840         dbg_info  *const dbgi   = get_dbg_info(&expression->base.source_position);
2841         ir_entity *const entity = new_d_entity(frame_type, id, irtype, dbgi);
2842         set_entity_ld_ident(entity, id);
2843
2844         /* create initialisation code */
2845         initializer_t *initializer = expression->initializer;
2846         create_local_initializer(initializer, dbgi, entity, type);
2847
2848         /* create a sel for the compound literal address */
2849         ir_node *frame = get_irg_frame(current_ir_graph);
2850         ir_node *sel   = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
2851         return sel;
2852 }
2853
2854 /**
2855  * Transform a sizeof expression into Firm code.
2856  */
2857 static ir_node *sizeof_to_firm(const typeprop_expression_t *expression)
2858 {
2859         type_t *const type = skip_typeref(expression->type);
2860         /* §6.5.3.4:2 if the type is a VLA, evaluate the expression. */
2861         if (is_type_array(type) && type->array.is_vla
2862                         && expression->tp_expression != NULL) {
2863                 expression_to_firm(expression->tp_expression);
2864         }
2865         /* strange gnu extensions: sizeof(function) == 1 */
2866         if (is_type_function(type)) {
2867                 ir_mode *mode = get_ir_mode_storage(type_size_t);
2868                 return new_Const(get_mode_one(mode));
2869         }
2870
2871         return get_type_size_node(type);
2872 }
2873
2874 static entity_t *get_expression_entity(const expression_t *expression)
2875 {
2876         if (expression->kind != EXPR_REFERENCE)
2877                 return NULL;
2878
2879         return expression->reference.entity;
2880 }
2881
2882 static unsigned get_cparser_entity_alignment(const entity_t *entity)
2883 {
2884         switch(entity->kind) {
2885         DECLARATION_KIND_CASES
2886                 return entity->declaration.alignment;
2887         case ENTITY_STRUCT:
2888         case ENTITY_UNION:
2889                 return entity->compound.alignment;
2890         case ENTITY_TYPEDEF:
2891                 return entity->typedefe.alignment;
2892         default:
2893                 break;
2894         }
2895         return 0;
2896 }
2897
2898 /**
2899  * Transform an alignof expression into Firm code.
2900  */
2901 static ir_node *alignof_to_firm(const typeprop_expression_t *expression)
2902 {
2903         unsigned alignment = 0;
2904
2905         const expression_t *tp_expression = expression->tp_expression;
2906         if (tp_expression != NULL) {
2907                 entity_t *entity = get_expression_entity(tp_expression);
2908                 if (entity != NULL) {
2909                         if (entity->kind == ENTITY_FUNCTION) {
2910                                 /* a gnu-extension */
2911                                 alignment = 1;
2912                         } else {
2913                                 alignment = get_cparser_entity_alignment(entity);
2914                         }
2915                 }
2916         }
2917
2918         if (alignment == 0) {
2919                 type_t *type = expression->type;
2920                 alignment = get_type_alignment(type);
2921         }
2922
2923         dbg_info  *dbgi = get_dbg_info(&expression->base.source_position);
2924         ir_mode   *mode = get_ir_mode_arithmetic(expression->base.type);
2925         ir_tarval *tv   = new_tarval_from_long(alignment, mode);
2926         return new_d_Const(dbgi, tv);
2927 }
2928
2929 static void init_ir_types(void);
2930
2931 static ir_tarval *fold_constant_to_tarval(const expression_t *expression)
2932 {
2933         assert(is_type_valid(skip_typeref(expression->base.type)));
2934
2935         bool constant_folding_old = constant_folding;
2936         constant_folding = true;
2937
2938         init_ir_types();
2939
2940         assert(is_constant_expression(expression) == EXPR_CLASS_CONSTANT);
2941
2942         ir_graph *old_current_ir_graph = current_ir_graph;
2943         current_ir_graph = get_const_code_irg();
2944
2945         ir_node *cnst = expression_to_firm(expression);
2946         current_ir_graph = old_current_ir_graph;
2947
2948         if (!is_Const(cnst)) {
2949                 panic("couldn't fold constant");
2950         }
2951
2952         constant_folding = constant_folding_old;
2953
2954         return get_Const_tarval(cnst);
2955 }
2956
2957 /* this function is only used in parser.c, but it relies on libfirm functionality */
2958 bool constant_is_negative(const expression_t *expression)
2959 {
2960         assert(is_constant_expression(expression) == EXPR_CLASS_CONSTANT);
2961         ir_tarval *tv = fold_constant_to_tarval(expression);
2962         return tarval_is_negative(tv);
2963 }
2964
2965 long fold_constant_to_int(const expression_t *expression)
2966 {
2967         if (expression->kind == EXPR_ERROR)
2968                 return 0;
2969
2970         ir_tarval *tv = fold_constant_to_tarval(expression);
2971         if (!tarval_is_long(tv)) {
2972                 panic("result of constant folding is not integer");
2973         }
2974
2975         return get_tarval_long(tv);
2976 }
2977
2978 bool fold_constant_to_bool(const expression_t *expression)
2979 {
2980         if (expression->kind == EXPR_ERROR)
2981                 return false;
2982         ir_tarval *tv = fold_constant_to_tarval(expression);
2983         return !tarval_is_null(tv);
2984 }
2985
2986 static ir_node *conditional_to_firm(const conditional_expression_t *expression)
2987 {
2988         dbg_info *const dbgi = get_dbg_info(&expression->base.source_position);
2989
2990         /* first try to fold a constant condition */
2991         if (is_constant_expression(expression->condition) == EXPR_CLASS_CONSTANT) {
2992                 bool val = fold_constant_to_bool(expression->condition);
2993                 if (val) {
2994                         expression_t *true_expression = expression->true_expression;
2995                         if (true_expression == NULL)
2996                                 true_expression = expression->condition;
2997                         return expression_to_firm(true_expression);
2998                 } else {
2999                         return expression_to_firm(expression->false_expression);
3000                 }
3001         }
3002
3003         ir_node *const true_block  = new_immBlock();
3004         ir_node *const false_block = new_immBlock();
3005         ir_node *const cond_expr   = create_condition_evaluation(expression->condition, true_block, false_block);
3006         mature_immBlock(true_block);
3007         mature_immBlock(false_block);
3008
3009         set_cur_block(true_block);
3010         ir_node *true_val;
3011         if (expression->true_expression != NULL) {
3012                 true_val = expression_to_firm(expression->true_expression);
3013         } else if (cond_expr != NULL && get_irn_mode(cond_expr) != mode_b) {
3014                 true_val = cond_expr;
3015         } else {
3016                 /* Condition ended with a short circuit (&&, ||, !) operation or a
3017                  * comparison.  Generate a "1" as value for the true branch. */
3018                 true_val = new_Const(get_mode_one(mode_Is));
3019         }
3020         ir_node *const true_jmp = new_d_Jmp(dbgi);
3021
3022         set_cur_block(false_block);
3023         ir_node *const false_val = expression_to_firm(expression->false_expression);
3024         ir_node *const false_jmp = new_d_Jmp(dbgi);
3025
3026         /* create the common block */
3027         ir_node *const in_cf[2] = { true_jmp, false_jmp };
3028         ir_node *const block    = new_Block(lengthof(in_cf), in_cf);
3029         set_cur_block(block);
3030
3031         /* TODO improve static semantics, so either both or no values are NULL */
3032         if (true_val == NULL || false_val == NULL)
3033                 return NULL;
3034
3035         ir_node *const in[2] = { true_val, false_val };
3036         type_t  *const type  = skip_typeref(expression->base.type);
3037         ir_mode *mode;
3038         if (is_type_compound(type)) {
3039                 mode = mode_P;
3040         } else {
3041                 mode = get_ir_mode_arithmetic(type);
3042         }
3043         ir_node *const val   = new_d_Phi(dbgi, lengthof(in), in, mode);
3044
3045         return val;
3046 }
3047
3048 /**
3049  * Returns an IR-node representing the address of a field.
3050  */
3051 static ir_node *select_addr(const select_expression_t *expression)
3052 {
3053         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3054
3055         construct_select_compound(expression);
3056
3057         ir_node *compound_addr = expression_to_firm(expression->compound);
3058
3059         entity_t *entry = expression->compound_entry;
3060         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3061         assert(entry->declaration.kind == DECLARATION_KIND_COMPOUND_MEMBER);
3062
3063         if (constant_folding) {
3064                 ir_mode *mode = get_irn_mode(compound_addr);
3065                 /* FIXME: here, we need an integer mode with the same number of bits as mode */
3066                 ir_node *ofs  = new_Const_long(mode_uint, entry->compound_member.offset);
3067                 return new_d_Add(dbgi, compound_addr, ofs, mode);
3068         } else {
3069                 ir_entity *irentity = entry->compound_member.entity;
3070                 assert(irentity != NULL);
3071                 return new_d_simpleSel(dbgi, new_NoMem(), compound_addr, irentity);
3072         }
3073 }
3074
3075 static ir_node *select_to_firm(const select_expression_t *expression)
3076 {
3077         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3078         ir_node  *addr = select_addr(expression);
3079         type_t   *type = revert_automatic_type_conversion(
3080                         (const expression_t*) expression);
3081         type           = skip_typeref(type);
3082
3083         entity_t *entry = expression->compound_entry;
3084         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3085
3086         if (entry->compound_member.bitfield) {
3087                 return bitfield_extract_to_firm(expression, addr);
3088         }
3089
3090         return deref_address(dbgi, type, addr);
3091 }
3092
3093 /* Values returned by __builtin_classify_type. */
3094 typedef enum gcc_type_class
3095 {
3096         no_type_class = -1,
3097         void_type_class,
3098         integer_type_class,
3099         char_type_class,
3100         enumeral_type_class,
3101         boolean_type_class,
3102         pointer_type_class,
3103         reference_type_class,
3104         offset_type_class,
3105         real_type_class,
3106         complex_type_class,
3107         function_type_class,
3108         method_type_class,
3109         record_type_class,
3110         union_type_class,
3111         array_type_class,
3112         string_type_class,
3113         set_type_class,
3114         file_type_class,
3115         lang_type_class
3116 } gcc_type_class;
3117
3118 static ir_node *classify_type_to_firm(const classify_type_expression_t *const expr)
3119 {
3120         type_t *type = expr->type_expression->base.type;
3121
3122         /* FIXME gcc returns different values depending on whether compiling C or C++
3123          * e.g. int x[10] is pointer_type_class in C, but array_type_class in C++ */
3124         gcc_type_class tc;
3125         for (;;) {
3126                 type = skip_typeref(type);
3127                 switch (type->kind) {
3128                         case TYPE_ATOMIC: {
3129                                 const atomic_type_t *const atomic_type = &type->atomic;
3130                                 switch (atomic_type->akind) {
3131                                         /* should not be reached */
3132                                         case ATOMIC_TYPE_INVALID:
3133                                                 tc = no_type_class;
3134                                                 goto make_const;
3135
3136                                         /* gcc cannot do that */
3137                                         case ATOMIC_TYPE_VOID:
3138                                                 tc = void_type_class;
3139                                                 goto make_const;
3140
3141                                         case ATOMIC_TYPE_WCHAR_T:   /* gcc handles this as integer */
3142                                         case ATOMIC_TYPE_CHAR:      /* gcc handles this as integer */
3143                                         case ATOMIC_TYPE_SCHAR:     /* gcc handles this as integer */
3144                                         case ATOMIC_TYPE_UCHAR:     /* gcc handles this as integer */
3145                                         case ATOMIC_TYPE_SHORT:
3146                                         case ATOMIC_TYPE_USHORT:
3147                                         case ATOMIC_TYPE_INT:
3148                                         case ATOMIC_TYPE_UINT:
3149                                         case ATOMIC_TYPE_LONG:
3150                                         case ATOMIC_TYPE_ULONG:
3151                                         case ATOMIC_TYPE_LONGLONG:
3152                                         case ATOMIC_TYPE_ULONGLONG:
3153                                         case ATOMIC_TYPE_BOOL:      /* gcc handles this as integer */
3154                                                 tc = integer_type_class;
3155                                                 goto make_const;
3156
3157                                         case ATOMIC_TYPE_FLOAT:
3158                                         case ATOMIC_TYPE_DOUBLE:
3159                                         case ATOMIC_TYPE_LONG_DOUBLE:
3160                                                 tc = real_type_class;
3161                                                 goto make_const;
3162                                 }
3163                                 panic("Unexpected atomic type in classify_type_to_firm().");
3164                         }
3165
3166                         case TYPE_COMPLEX:         tc = complex_type_class; goto make_const;
3167                         case TYPE_IMAGINARY:       tc = complex_type_class; goto make_const;
3168                         case TYPE_ARRAY:           /* gcc handles this as pointer */
3169                         case TYPE_FUNCTION:        /* gcc handles this as pointer */
3170                         case TYPE_POINTER:         tc = pointer_type_class; goto make_const;
3171                         case TYPE_COMPOUND_STRUCT: tc = record_type_class;  goto make_const;
3172                         case TYPE_COMPOUND_UNION:  tc = union_type_class;   goto make_const;
3173
3174                         /* gcc handles this as integer */
3175                         case TYPE_ENUM:            tc = integer_type_class; goto make_const;
3176
3177                         /* gcc classifies the referenced type */
3178                         case TYPE_REFERENCE: type = type->reference.refers_to; continue;
3179
3180                         /* typedef/typeof should be skipped already */
3181                         case TYPE_TYPEDEF:
3182                         case TYPE_TYPEOF:
3183                         case TYPE_ERROR:
3184                                 break;
3185                 }
3186                 panic("unexpected TYPE classify_type_to_firm().");
3187         }
3188
3189 make_const:;
3190         dbg_info  *const dbgi = get_dbg_info(&expr->base.source_position);
3191         ir_tarval *const tv   = new_tarval_from_long(tc, mode_int);
3192         return new_d_Const(dbgi, tv);
3193 }
3194
3195 static ir_node *function_name_to_firm(
3196                 const funcname_expression_t *const expr)
3197 {
3198         switch(expr->kind) {
3199         case FUNCNAME_FUNCTION:
3200         case FUNCNAME_PRETTY_FUNCTION:
3201         case FUNCNAME_FUNCDNAME:
3202                 if (current_function_name == NULL) {
3203                         const source_position_t *const src_pos = &expr->base.source_position;
3204                         const char    *name  = current_function_entity->base.symbol->string;
3205                         const string_t string = { name, strlen(name) + 1 };
3206                         current_function_name = string_to_firm(src_pos, "__func__.%u", &string);
3207                 }
3208                 return current_function_name;
3209         case FUNCNAME_FUNCSIG:
3210                 if (current_funcsig == NULL) {
3211                         const source_position_t *const src_pos = &expr->base.source_position;
3212                         ir_entity *ent = get_irg_entity(current_ir_graph);
3213                         const char *const name = get_entity_ld_name(ent);
3214                         const string_t string = { name, strlen(name) + 1 };
3215                         current_funcsig = string_to_firm(src_pos, "__FUNCSIG__.%u", &string);
3216                 }
3217                 return current_funcsig;
3218         }
3219         panic("Unsupported function name");
3220 }
3221
3222 static ir_node *statement_expression_to_firm(const statement_expression_t *expr)
3223 {
3224         statement_t *statement = expr->statement;
3225
3226         assert(statement->kind == STATEMENT_COMPOUND);
3227         return compound_statement_to_firm(&statement->compound);
3228 }
3229
3230 static ir_node *va_start_expression_to_firm(
3231         const va_start_expression_t *const expr)
3232 {
3233         ir_entity *param_ent = current_vararg_entity;
3234         if (param_ent == NULL) {
3235                 size_t   const n           = IR_VA_START_PARAMETER_NUMBER;
3236                 ir_type *const frame_type  = get_irg_frame_type(current_ir_graph);
3237                 ir_type *const param_type  = get_unknown_type();
3238                 param_ent = new_parameter_entity(frame_type, n, param_type);
3239                 current_vararg_entity = param_ent;
3240         }
3241
3242         ir_node  *const frame   = get_irg_frame(current_ir_graph);
3243         dbg_info *const dbgi    = get_dbg_info(&expr->base.source_position);
3244         ir_node  *const no_mem  = new_NoMem();
3245         ir_node  *const arg_sel = new_d_simpleSel(dbgi, no_mem, frame, param_ent);
3246
3247         set_value_for_expression(expr->ap, arg_sel);
3248
3249         return NULL;
3250 }
3251
3252 static ir_node *va_arg_expression_to_firm(const va_arg_expression_t *const expr)
3253 {
3254         type_t       *const type    = expr->base.type;
3255         expression_t *const ap_expr = expr->ap;
3256         ir_node      *const ap_addr = expression_to_addr(ap_expr);
3257         ir_node      *const ap      = get_value_from_lvalue(ap_expr, ap_addr);
3258         dbg_info     *const dbgi    = get_dbg_info(&expr->base.source_position);
3259         ir_node      *const res     = deref_address(dbgi, type, ap);
3260
3261         ir_node      *const cnst    = get_type_size_node(expr->base.type);
3262         ir_mode      *const mode    = get_irn_mode(cnst);
3263         ir_node      *const c1      = new_Const_long(mode, stack_param_align - 1);
3264         ir_node      *const c2      = new_d_Add(dbgi, cnst, c1, mode);
3265         ir_node      *const c3      = new_Const_long(mode, -(long)stack_param_align);
3266         ir_node      *const c4      = new_d_And(dbgi, c2, c3, mode);
3267         ir_node      *const add     = new_d_Add(dbgi, ap, c4, mode_P_data);
3268
3269         set_value_for_expression_addr(ap_expr, add, ap_addr);
3270
3271         return res;
3272 }
3273
3274 /**
3275  * Generate Firm for a va_copy expression.
3276  */
3277 static ir_node *va_copy_expression_to_firm(const va_copy_expression_t *const expr)
3278 {
3279         ir_node *const src = expression_to_firm(expr->src);
3280         set_value_for_expression(expr->dst, src);
3281         return NULL;
3282 }
3283
3284 static ir_node *dereference_addr(const unary_expression_t *const expression)
3285 {
3286         assert(expression->base.kind == EXPR_UNARY_DEREFERENCE);
3287         return expression_to_firm(expression->value);
3288 }
3289
3290 /**
3291  * Returns a IR-node representing an lvalue of the given expression.
3292  */
3293 static ir_node *expression_to_addr(const expression_t *expression)
3294 {
3295         switch(expression->kind) {
3296         case EXPR_ARRAY_ACCESS:
3297                 return array_access_addr(&expression->array_access);
3298         case EXPR_CALL:
3299                 return call_expression_to_firm(&expression->call);
3300         case EXPR_COMPOUND_LITERAL:
3301                 return compound_literal_to_firm(&expression->compound_literal);
3302         case EXPR_REFERENCE:
3303                 return reference_addr(&expression->reference);
3304         case EXPR_SELECT:
3305                 return select_addr(&expression->select);
3306         case EXPR_UNARY_DEREFERENCE:
3307                 return dereference_addr(&expression->unary);
3308         default:
3309                 break;
3310         }
3311         panic("trying to get address of non-lvalue");
3312 }
3313
3314 static ir_node *builtin_constant_to_firm(
3315                 const builtin_constant_expression_t *expression)
3316 {
3317         ir_mode *const mode = get_ir_mode_arithmetic(expression->base.type);
3318         bool     const v    = is_constant_expression(expression->value) == EXPR_CLASS_CONSTANT;
3319         return create_Const_from_bool(mode, v);
3320 }
3321
3322 static ir_node *builtin_types_compatible_to_firm(
3323                 const builtin_types_compatible_expression_t *expression)
3324 {
3325         type_t  *const left  = get_unqualified_type(skip_typeref(expression->left));
3326         type_t  *const right = get_unqualified_type(skip_typeref(expression->right));
3327         bool     const value = types_compatible(left, right);
3328         ir_mode *const mode  = get_ir_mode_arithmetic(expression->base.type);
3329         return create_Const_from_bool(mode, value);
3330 }
3331
3332 static ir_node *get_label_block(label_t *label)
3333 {
3334         if (label->block != NULL)
3335                 return label->block;
3336
3337         /* beware: might be called from create initializer with current_ir_graph
3338          * set to const_code_irg. */
3339         ir_graph *rem    = current_ir_graph;
3340         current_ir_graph = current_function;
3341
3342         ir_node *block = new_immBlock();
3343
3344         label->block = block;
3345
3346         ARR_APP1(label_t *, all_labels, label);
3347
3348         current_ir_graph = rem;
3349         return block;
3350 }
3351
3352 /**
3353  * Pointer to a label.  This is used for the
3354  * GNU address-of-label extension.
3355  */
3356 static ir_node *label_address_to_firm(const label_address_expression_t *label)
3357 {
3358         dbg_info  *dbgi   = get_dbg_info(&label->base.source_position);
3359         ir_node   *block  = get_label_block(label->label);
3360         ir_entity *entity = create_Block_entity(block);
3361
3362         symconst_symbol value;
3363         value.entity_p = entity;
3364         return new_d_SymConst(dbgi, mode_P_code, value, symconst_addr_ent);
3365 }
3366
3367 static ir_node *error_to_firm(const expression_t *expression)
3368 {
3369         ir_mode *mode = get_ir_mode_arithmetic(expression->base.type);
3370         return new_Bad(mode);
3371 }
3372
3373 /**
3374  * creates firm nodes for an expression. The difference between this function
3375  * and expression_to_firm is, that this version might produce mode_b nodes
3376  * instead of mode_Is.
3377  */
3378 static ir_node *_expression_to_firm(const expression_t *expression)
3379 {
3380 #ifndef NDEBUG
3381         if (!constant_folding) {
3382                 assert(!expression->base.transformed);
3383                 ((expression_t*) expression)->base.transformed = true;
3384         }
3385 #endif
3386
3387         switch (expression->kind) {
3388         EXPR_LITERAL_CASES
3389                 return literal_to_firm(&expression->literal);
3390         case EXPR_STRING_LITERAL:
3391                 return string_to_firm(&expression->base.source_position, "str.%u",
3392                                       &expression->literal.value);
3393         case EXPR_WIDE_STRING_LITERAL:
3394                 return wide_string_literal_to_firm(&expression->string_literal);
3395         case EXPR_REFERENCE:
3396                 return reference_expression_to_firm(&expression->reference);
3397         case EXPR_REFERENCE_ENUM_VALUE:
3398                 return reference_expression_enum_value_to_firm(&expression->reference);
3399         case EXPR_CALL:
3400                 return call_expression_to_firm(&expression->call);
3401         EXPR_UNARY_CASES
3402                 return unary_expression_to_firm(&expression->unary);
3403         EXPR_BINARY_CASES
3404                 return binary_expression_to_firm(&expression->binary);
3405         case EXPR_ARRAY_ACCESS:
3406                 return array_access_to_firm(&expression->array_access);
3407         case EXPR_SIZEOF:
3408                 return sizeof_to_firm(&expression->typeprop);
3409         case EXPR_ALIGNOF:
3410                 return alignof_to_firm(&expression->typeprop);
3411         case EXPR_CONDITIONAL:
3412                 return conditional_to_firm(&expression->conditional);
3413         case EXPR_SELECT:
3414                 return select_to_firm(&expression->select);
3415         case EXPR_CLASSIFY_TYPE:
3416                 return classify_type_to_firm(&expression->classify_type);
3417         case EXPR_FUNCNAME:
3418                 return function_name_to_firm(&expression->funcname);
3419         case EXPR_STATEMENT:
3420                 return statement_expression_to_firm(&expression->statement);
3421         case EXPR_VA_START:
3422                 return va_start_expression_to_firm(&expression->va_starte);
3423         case EXPR_VA_ARG:
3424                 return va_arg_expression_to_firm(&expression->va_arge);
3425         case EXPR_VA_COPY:
3426                 return va_copy_expression_to_firm(&expression->va_copye);
3427         case EXPR_BUILTIN_CONSTANT_P:
3428                 return builtin_constant_to_firm(&expression->builtin_constant);
3429         case EXPR_BUILTIN_TYPES_COMPATIBLE_P:
3430                 return builtin_types_compatible_to_firm(&expression->builtin_types_compatible);
3431         case EXPR_OFFSETOF:
3432                 return offsetof_to_firm(&expression->offsetofe);
3433         case EXPR_COMPOUND_LITERAL:
3434                 return compound_literal_to_firm(&expression->compound_literal);
3435         case EXPR_LABEL_ADDRESS:
3436                 return label_address_to_firm(&expression->label_address);
3437
3438         case EXPR_ERROR:
3439                 return error_to_firm(expression);
3440         }
3441         panic("invalid expression found");
3442 }
3443
3444 /**
3445  * Check if a given expression is a GNU __builtin_expect() call.
3446  */
3447 static bool is_builtin_expect(const expression_t *expression)
3448 {
3449         if (expression->kind != EXPR_CALL)
3450                 return false;
3451
3452         expression_t *function = expression->call.function;
3453         if (function->kind != EXPR_REFERENCE)
3454                 return false;
3455         reference_expression_t *ref = &function->reference;
3456         if (ref->entity->kind         != ENTITY_FUNCTION ||
3457             ref->entity->function.btk != BUILTIN_EXPECT)
3458                 return false;
3459
3460         return true;
3461 }
3462
3463 static bool produces_mode_b(const expression_t *expression)
3464 {
3465         switch (expression->kind) {
3466         case EXPR_BINARY_EQUAL:
3467         case EXPR_BINARY_NOTEQUAL:
3468         case EXPR_BINARY_LESS:
3469         case EXPR_BINARY_LESSEQUAL:
3470         case EXPR_BINARY_GREATER:
3471         case EXPR_BINARY_GREATEREQUAL:
3472         case EXPR_BINARY_ISGREATER:
3473         case EXPR_BINARY_ISGREATEREQUAL:
3474         case EXPR_BINARY_ISLESS:
3475         case EXPR_BINARY_ISLESSEQUAL:
3476         case EXPR_BINARY_ISLESSGREATER:
3477         case EXPR_BINARY_ISUNORDERED:
3478         case EXPR_UNARY_NOT:
3479                 return true;
3480
3481         case EXPR_CALL:
3482                 if (is_builtin_expect(expression)) {
3483                         expression_t *argument = expression->call.arguments->expression;
3484                         return produces_mode_b(argument);
3485                 }
3486                 return false;
3487         case EXPR_BINARY_COMMA:
3488                 return produces_mode_b(expression->binary.right);
3489
3490         default:
3491                 return false;
3492         }
3493 }
3494
3495 static ir_node *expression_to_firm(const expression_t *expression)
3496 {
3497         if (!produces_mode_b(expression)) {
3498                 ir_node *res = _expression_to_firm(expression);
3499                 assert(res == NULL || get_irn_mode(res) != mode_b);
3500                 return res;
3501         }
3502
3503         if (is_constant_expression(expression) == EXPR_CLASS_CONSTANT) {
3504                 bool const constant_folding_old = constant_folding;
3505                 constant_folding = true;
3506                 ir_node *res  = _expression_to_firm(expression);
3507                 constant_folding = constant_folding_old;
3508                 ir_mode *mode = get_ir_mode_arithmetic(expression->base.type);
3509                 assert(is_Const(res));
3510                 return create_Const_from_bool(mode, !is_Const_null(res));
3511         }
3512
3513         /* we have to produce a 0/1 from the mode_b expression */
3514         dbg_info *dbgi = get_dbg_info(&expression->base.source_position);
3515         ir_mode  *mode = get_ir_mode_arithmetic(expression->base.type);
3516         return produce_condition_result(expression, mode, dbgi);
3517 }
3518
3519 /**
3520  * create a short-circuit expression evaluation that tries to construct
3521  * efficient control flow structures for &&, || and ! expressions
3522  */
3523 static ir_node *create_condition_evaluation(const expression_t *expression,
3524                                             ir_node *true_block,
3525                                             ir_node *false_block)
3526 {
3527         switch(expression->kind) {
3528         case EXPR_UNARY_NOT: {
3529                 const unary_expression_t *unary_expression = &expression->unary;
3530                 create_condition_evaluation(unary_expression->value, false_block,
3531                                             true_block);
3532                 return NULL;
3533         }
3534         case EXPR_BINARY_LOGICAL_AND: {
3535                 const binary_expression_t *binary_expression = &expression->binary;
3536
3537                 ir_node *extra_block = new_immBlock();
3538                 create_condition_evaluation(binary_expression->left, extra_block,
3539                                             false_block);
3540                 mature_immBlock(extra_block);
3541                 set_cur_block(extra_block);
3542                 create_condition_evaluation(binary_expression->right, true_block,
3543                                             false_block);
3544                 return NULL;
3545         }
3546         case EXPR_BINARY_LOGICAL_OR: {
3547                 const binary_expression_t *binary_expression = &expression->binary;
3548
3549                 ir_node *extra_block = new_immBlock();
3550                 create_condition_evaluation(binary_expression->left, true_block,
3551                                             extra_block);
3552                 mature_immBlock(extra_block);
3553                 set_cur_block(extra_block);
3554                 create_condition_evaluation(binary_expression->right, true_block,
3555                                             false_block);
3556                 return NULL;
3557         }
3558         default:
3559                 break;
3560         }
3561
3562         dbg_info *dbgi       = get_dbg_info(&expression->base.source_position);
3563         ir_node  *cond_expr  = _expression_to_firm(expression);
3564         ir_node  *condition  = create_conv(dbgi, cond_expr, mode_b);
3565         ir_node  *cond       = new_d_Cond(dbgi, condition);
3566         ir_node  *true_proj  = new_d_Proj(dbgi, cond, mode_X, pn_Cond_true);
3567         ir_node  *false_proj = new_d_Proj(dbgi, cond, mode_X, pn_Cond_false);
3568
3569         /* set branch prediction info based on __builtin_expect */
3570         if (is_builtin_expect(expression) && is_Cond(cond)) {
3571                 call_argument_t *argument = expression->call.arguments->next;
3572                 if (is_constant_expression(argument->expression) == EXPR_CLASS_CONSTANT) {
3573                         bool               const cnst = fold_constant_to_bool(argument->expression);
3574                         cond_jmp_predicate const pred = cnst ? COND_JMP_PRED_TRUE : COND_JMP_PRED_FALSE;
3575                         set_Cond_jmp_pred(cond, pred);
3576                 }
3577         }
3578
3579         add_immBlock_pred(true_block, true_proj);
3580         add_immBlock_pred(false_block, false_proj);
3581
3582         set_unreachable_now();
3583         return cond_expr;
3584 }
3585
3586 static void create_variable_entity(entity_t *variable,
3587                                    declaration_kind_t declaration_kind,
3588                                    ir_type *parent_type)
3589 {
3590         assert(variable->kind == ENTITY_VARIABLE);
3591         type_t    *type = skip_typeref(variable->declaration.type);
3592
3593         ident     *const id        = new_id_from_str(variable->base.symbol->string);
3594         ir_type   *const irtype    = get_ir_type(type);
3595         dbg_info  *const dbgi      = get_dbg_info(&variable->base.source_position);
3596         ir_entity *const irentity  = new_d_entity(parent_type, id, irtype, dbgi);
3597         unsigned         alignment = variable->declaration.alignment;
3598
3599         set_entity_alignment(irentity, alignment);
3600
3601         handle_decl_modifiers(irentity, variable);
3602
3603         variable->declaration.kind  = (unsigned char) declaration_kind;
3604         variable->variable.v.entity = irentity;
3605         set_entity_ld_ident(irentity, create_ld_ident(variable));
3606
3607         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
3608                 set_entity_volatility(irentity, volatility_is_volatile);
3609         }
3610 }
3611
3612
3613 typedef struct type_path_entry_t type_path_entry_t;
3614 struct type_path_entry_t {
3615         type_t           *type;
3616         ir_initializer_t *initializer;
3617         size_t            index;
3618         entity_t         *compound_entry;
3619 };
3620
3621 typedef struct type_path_t type_path_t;
3622 struct type_path_t {
3623         type_path_entry_t *path;
3624         type_t            *top_type;
3625         bool               invalid;
3626 };
3627
3628 static __attribute__((unused)) void debug_print_type_path(const type_path_t *path)
3629 {
3630         size_t len = ARR_LEN(path->path);
3631
3632         for (size_t i = 0; i < len; ++i) {
3633                 const type_path_entry_t *entry = & path->path[i];
3634
3635                 type_t *type = skip_typeref(entry->type);
3636                 if (is_type_compound(type)) {
3637                         fprintf(stderr, ".%s", entry->compound_entry->base.symbol->string);
3638                 } else if (is_type_array(type)) {
3639                         fprintf(stderr, "[%u]", (unsigned) entry->index);
3640                 } else {
3641                         fprintf(stderr, "-INVALID-");
3642                 }
3643         }
3644         fprintf(stderr, "  (");
3645         print_type(path->top_type);
3646         fprintf(stderr, ")");
3647 }
3648
3649 static type_path_entry_t *get_type_path_top(const type_path_t *path)
3650 {
3651         size_t len = ARR_LEN(path->path);
3652         assert(len > 0);
3653         return & path->path[len-1];
3654 }
3655
3656 static type_path_entry_t *append_to_type_path(type_path_t *path)
3657 {
3658         size_t len = ARR_LEN(path->path);
3659         ARR_RESIZE(type_path_entry_t, path->path, len+1);
3660
3661         type_path_entry_t *result = & path->path[len];
3662         memset(result, 0, sizeof(result[0]));
3663         return result;
3664 }
3665
3666 static size_t get_compound_member_count(const compound_type_t *type)
3667 {
3668         compound_t *compound  = type->compound;
3669         size_t      n_members = 0;
3670         entity_t   *member    = compound->members.entities;
3671         for ( ; member != NULL; member = member->base.next) {
3672                 ++n_members;
3673         }
3674
3675         return n_members;
3676 }
3677
3678 static ir_initializer_t *get_initializer_entry(type_path_t *path)
3679 {
3680         type_t *orig_top_type = path->top_type;
3681         type_t *top_type      = skip_typeref(orig_top_type);
3682
3683         assert(is_type_compound(top_type) || is_type_array(top_type));
3684
3685         if (ARR_LEN(path->path) == 0) {
3686                 return NULL;
3687         } else {
3688                 type_path_entry_t *top         = get_type_path_top(path);
3689                 ir_initializer_t  *initializer = top->initializer;
3690                 return get_initializer_compound_value(initializer, top->index);
3691         }
3692 }
3693
3694 static void descend_into_subtype(type_path_t *path)
3695 {
3696         type_t *orig_top_type = path->top_type;
3697         type_t *top_type      = skip_typeref(orig_top_type);
3698
3699         assert(is_type_compound(top_type) || is_type_array(top_type));
3700
3701         ir_initializer_t *initializer = get_initializer_entry(path);
3702
3703         type_path_entry_t *top = append_to_type_path(path);
3704         top->type              = top_type;
3705
3706         size_t len;
3707
3708         if (is_type_compound(top_type)) {
3709                 compound_t *const compound = top_type->compound.compound;
3710                 entity_t   *const entry    = skip_unnamed_bitfields(compound->members.entities);
3711
3712                 top->compound_entry = entry;
3713                 top->index          = 0;
3714                 len                 = get_compound_member_count(&top_type->compound);
3715                 if (entry != NULL) {
3716                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3717                         path->top_type = entry->declaration.type;
3718                 }
3719         } else {
3720                 assert(is_type_array(top_type));
3721                 assert(top_type->array.size > 0);
3722
3723                 top->index     = 0;
3724                 path->top_type = top_type->array.element_type;
3725                 len            = top_type->array.size;
3726         }
3727         if (initializer == NULL
3728                         || get_initializer_kind(initializer) == IR_INITIALIZER_NULL) {
3729                 initializer = create_initializer_compound(len);
3730                 /* we have to set the entry at the 2nd latest path entry... */
3731                 size_t path_len = ARR_LEN(path->path);
3732                 assert(path_len >= 1);
3733                 if (path_len > 1) {
3734                         type_path_entry_t *entry        = & path->path[path_len-2];
3735                         ir_initializer_t  *tinitializer = entry->initializer;
3736                         set_initializer_compound_value(tinitializer, entry->index,
3737                                                        initializer);
3738                 }
3739         }
3740         top->initializer = initializer;
3741 }
3742
3743 static void ascend_from_subtype(type_path_t *path)
3744 {
3745         type_path_entry_t *top = get_type_path_top(path);
3746
3747         path->top_type = top->type;
3748
3749         size_t len = ARR_LEN(path->path);
3750         ARR_RESIZE(type_path_entry_t, path->path, len-1);
3751 }
3752
3753 static void walk_designator(type_path_t *path, const designator_t *designator)
3754 {
3755         /* designators start at current object type */
3756         ARR_RESIZE(type_path_entry_t, path->path, 1);
3757
3758         for ( ; designator != NULL; designator = designator->next) {
3759                 type_path_entry_t *top         = get_type_path_top(path);
3760                 type_t            *orig_type   = top->type;
3761                 type_t            *type        = skip_typeref(orig_type);
3762
3763                 if (designator->symbol != NULL) {
3764                         assert(is_type_compound(type));
3765                         size_t    index  = 0;
3766                         symbol_t *symbol = designator->symbol;
3767
3768                         compound_t *compound = type->compound.compound;
3769                         entity_t   *iter     = compound->members.entities;
3770                         for ( ; iter != NULL; iter = iter->base.next, ++index) {
3771                                 if (iter->base.symbol == symbol) {
3772                                         assert(iter->kind == ENTITY_COMPOUND_MEMBER);
3773                                         break;
3774                                 }
3775                         }
3776                         assert(iter != NULL);
3777
3778                         /* revert previous initialisations of other union elements */
3779                         if (type->kind == TYPE_COMPOUND_UNION) {
3780                                 ir_initializer_t *initializer = top->initializer;
3781                                 if (initializer != NULL
3782                                         && get_initializer_kind(initializer) == IR_INITIALIZER_COMPOUND) {
3783                                         /* are we writing to a new element? */
3784                                         ir_initializer_t *oldi
3785                                                 = get_initializer_compound_value(initializer, index);
3786                                         if (get_initializer_kind(oldi) == IR_INITIALIZER_NULL) {
3787                                                 /* clear initializer */
3788                                                 size_t len
3789                                                         = get_initializer_compound_n_entries(initializer);
3790                                                 ir_initializer_t *nulli = get_initializer_null();
3791                                                 for (size_t i = 0; i < len; ++i) {
3792                                                         set_initializer_compound_value(initializer, i,
3793                                                                                        nulli);
3794                                                 }
3795                                         }
3796                                 }
3797                         }
3798
3799                         top->type           = orig_type;
3800                         top->compound_entry = iter;
3801                         top->index          = index;
3802                         orig_type           = iter->declaration.type;
3803                 } else {
3804                         expression_t *array_index = designator->array_index;
3805                         assert(designator->array_index != NULL);
3806                         assert(is_type_array(type));
3807
3808                         long index = fold_constant_to_int(array_index);
3809                         assert(index >= 0);
3810 #ifndef NDEBUG
3811                         if (type->array.size_constant) {
3812                                 long array_size = type->array.size;
3813                                 assert(index < array_size);
3814                         }
3815 #endif
3816
3817                         top->type  = orig_type;
3818                         top->index = (size_t) index;
3819                         orig_type  = type->array.element_type;
3820                 }
3821                 path->top_type = orig_type;
3822
3823                 if (designator->next != NULL) {
3824                         descend_into_subtype(path);
3825                 }
3826         }
3827
3828         path->invalid  = false;
3829 }
3830
3831 static void advance_current_object(type_path_t *path)
3832 {
3833         if (path->invalid) {
3834                 /* TODO: handle this... */
3835                 panic("invalid initializer in ast2firm (excessive elements)");
3836         }
3837
3838         type_path_entry_t *top = get_type_path_top(path);
3839
3840         type_t *type = skip_typeref(top->type);
3841         if (is_type_union(type)) {
3842                 /* only the first element is initialized in unions */
3843                 top->compound_entry = NULL;
3844         } else if (is_type_struct(type)) {
3845                 entity_t *entry = top->compound_entry;
3846
3847                 top->index++;
3848                 entry               = skip_unnamed_bitfields(entry->base.next);
3849                 top->compound_entry = entry;
3850                 if (entry != NULL) {
3851                         assert(entry->kind == ENTITY_COMPOUND_MEMBER);
3852                         path->top_type = entry->declaration.type;
3853                         return;
3854                 }
3855         } else {
3856                 assert(is_type_array(type));
3857
3858                 top->index++;
3859                 if (!type->array.size_constant || top->index < type->array.size) {
3860                         return;
3861                 }
3862         }
3863
3864         /* we're past the last member of the current sub-aggregate, try if we
3865          * can ascend in the type hierarchy and continue with another subobject */
3866         size_t len = ARR_LEN(path->path);
3867
3868         if (len > 1) {
3869                 ascend_from_subtype(path);
3870                 advance_current_object(path);
3871         } else {
3872                 path->invalid = true;
3873         }
3874 }
3875
3876
3877 static ir_initializer_t *create_ir_initializer(
3878                 const initializer_t *initializer, type_t *type);
3879
3880 static ir_initializer_t *create_ir_initializer_value(
3881                 const initializer_value_t *initializer)
3882 {
3883         if (is_type_compound(initializer->value->base.type)) {
3884                 panic("initializer creation for compounds not implemented yet");
3885         }
3886         type_t       *type = initializer->value->base.type;
3887         expression_t *expr = initializer->value;
3888         ir_node *value = expression_to_firm(expr);
3889         ir_mode *mode  = get_ir_mode_storage(type);
3890         value          = create_conv(NULL, value, mode);
3891         return create_initializer_const(value);
3892 }
3893
3894 /** test wether type can be initialized by a string constant */
3895 static bool is_string_type(type_t *type)
3896 {
3897         type_t *inner;
3898         if (is_type_pointer(type)) {
3899                 inner = skip_typeref(type->pointer.points_to);
3900         } else if(is_type_array(type)) {
3901                 inner = skip_typeref(type->array.element_type);
3902         } else {
3903                 return false;
3904         }
3905
3906         return is_type_integer(inner);
3907 }
3908
3909 static ir_initializer_t *create_ir_initializer_list(
3910                 const initializer_list_t *initializer, type_t *type)
3911 {
3912         type_path_t path;
3913         memset(&path, 0, sizeof(path));
3914         path.top_type = type;
3915         path.path     = NEW_ARR_F(type_path_entry_t, 0);
3916
3917         descend_into_subtype(&path);
3918
3919         for (size_t i = 0; i < initializer->len; ++i) {
3920                 const initializer_t *sub_initializer = initializer->initializers[i];
3921
3922                 if (sub_initializer->kind == INITIALIZER_DESIGNATOR) {
3923                         walk_designator(&path, sub_initializer->designator.designator);
3924                         continue;
3925                 }
3926
3927                 if (sub_initializer->kind == INITIALIZER_VALUE) {
3928                         /* we might have to descend into types until we're at a scalar
3929                          * type */
3930                         while(true) {
3931                                 type_t *orig_top_type = path.top_type;
3932                                 type_t *top_type      = skip_typeref(orig_top_type);
3933
3934                                 if (is_type_scalar(top_type))
3935                                         break;
3936                                 descend_into_subtype(&path);
3937                         }
3938                 } else if (sub_initializer->kind == INITIALIZER_STRING
3939                                 || sub_initializer->kind == INITIALIZER_WIDE_STRING) {
3940                         /* we might have to descend into types until we're at a scalar
3941                          * type */
3942                         while (true) {
3943                                 type_t *orig_top_type = path.top_type;
3944                                 type_t *top_type      = skip_typeref(orig_top_type);
3945
3946                                 if (is_string_type(top_type))
3947                                         break;
3948                                 descend_into_subtype(&path);
3949                         }
3950                 }
3951
3952                 ir_initializer_t *sub_irinitializer
3953                         = create_ir_initializer(sub_initializer, path.top_type);
3954
3955                 size_t path_len = ARR_LEN(path.path);
3956                 assert(path_len >= 1);
3957                 type_path_entry_t *entry        = & path.path[path_len-1];
3958                 ir_initializer_t  *tinitializer = entry->initializer;
3959                 set_initializer_compound_value(tinitializer, entry->index,
3960                                                sub_irinitializer);
3961
3962                 advance_current_object(&path);
3963         }
3964
3965         assert(ARR_LEN(path.path) >= 1);
3966         ir_initializer_t *result = path.path[0].initializer;
3967         DEL_ARR_F(path.path);
3968
3969         return result;
3970 }
3971
3972 static ir_initializer_t *create_ir_initializer_string(
3973                 const initializer_string_t *initializer, type_t *type)
3974 {
3975         type = skip_typeref(type);
3976
3977         size_t            string_len    = initializer->string.size;
3978         assert(type->kind == TYPE_ARRAY);
3979         assert(type->array.size_constant);
3980         size_t            len           = type->array.size;
3981         ir_initializer_t *irinitializer = create_initializer_compound(len);
3982
3983         const char *string = initializer->string.begin;
3984         ir_mode    *mode   = get_ir_mode_storage(type->array.element_type);
3985
3986         for (size_t i = 0; i < len; ++i) {
3987                 char c = 0;
3988                 if (i < string_len)
3989                         c = string[i];
3990
3991                 ir_tarval        *tv = new_tarval_from_long(c, mode);
3992                 ir_initializer_t *char_initializer = create_initializer_tarval(tv);
3993
3994                 set_initializer_compound_value(irinitializer, i, char_initializer);
3995         }
3996
3997         return irinitializer;
3998 }
3999
4000 static ir_initializer_t *create_ir_initializer_wide_string(
4001                 const initializer_wide_string_t *initializer, type_t *type)
4002 {
4003         assert(type->kind == TYPE_ARRAY);
4004         assert(type->array.size_constant);
4005         size_t            len           = type->array.size;
4006         size_t            string_len    = wstrlen(&initializer->string);
4007         ir_initializer_t *irinitializer = create_initializer_compound(len);
4008
4009         const char *p    = initializer->string.begin;
4010         ir_mode    *mode = get_type_mode(ir_type_wchar_t);
4011
4012         for (size_t i = 0; i < len; ++i) {
4013                 utf32 c = 0;
4014                 if (i < string_len) {
4015                         c = read_utf8_char(&p);
4016                 }
4017                 ir_tarval *tv = new_tarval_from_long(c, mode);
4018                 ir_initializer_t *char_initializer = create_initializer_tarval(tv);
4019
4020                 set_initializer_compound_value(irinitializer, i, char_initializer);
4021         }
4022
4023         return irinitializer;
4024 }
4025
4026 static ir_initializer_t *create_ir_initializer(
4027                 const initializer_t *initializer, type_t *type)
4028 {
4029         switch(initializer->kind) {
4030                 case INITIALIZER_STRING:
4031                         return create_ir_initializer_string(&initializer->string, type);
4032
4033                 case INITIALIZER_WIDE_STRING:
4034                         return create_ir_initializer_wide_string(&initializer->wide_string,
4035                                                                  type);
4036
4037                 case INITIALIZER_LIST:
4038                         return create_ir_initializer_list(&initializer->list, type);
4039
4040                 case INITIALIZER_VALUE:
4041                         return create_ir_initializer_value(&initializer->value);
4042
4043                 case INITIALIZER_DESIGNATOR:
4044                         panic("unexpected designator initializer found");
4045         }
4046         panic("unknown initializer");
4047 }
4048
4049 /** ANSI C §6.7.8:21: If there are fewer initializers [..] than there
4050  *  are elements [...] the remainder of the aggregate shall be initialized
4051  *  implicitly the same as objects that have static storage duration. */
4052 static void create_dynamic_null_initializer(ir_entity *entity, dbg_info *dbgi,
4053                 ir_node *base_addr)
4054 {
4055         /* for unions we must NOT do anything for null initializers */
4056         ir_type *owner = get_entity_owner(entity);
4057         if (is_Union_type(owner)) {
4058                 return;
4059         }
4060
4061         ir_type *ent_type = get_entity_type(entity);
4062         /* create sub-initializers for a compound type */
4063         if (is_compound_type(ent_type)) {
4064                 unsigned n_members = get_compound_n_members(ent_type);
4065                 for (unsigned n = 0; n < n_members; ++n) {
4066                         ir_entity *member = get_compound_member(ent_type, n);
4067                         ir_node   *addr   = new_d_simpleSel(dbgi, new_NoMem(), base_addr,
4068                                                                 member);
4069                         create_dynamic_null_initializer(member, dbgi, addr);
4070                 }
4071                 return;
4072         }
4073         if (is_Array_type(ent_type)) {
4074                 assert(has_array_upper_bound(ent_type, 0));
4075                 long n = get_array_upper_bound_int(ent_type, 0);
4076                 for (long i = 0; i < n; ++i) {
4077                         ir_tarval *index_tv = new_tarval_from_long(i, mode_uint);
4078                         ir_node   *cnst     = new_d_Const(dbgi, index_tv);
4079                         ir_node   *in[1]    = { cnst };
4080                         ir_entity *arrent   = get_array_element_entity(ent_type);
4081                         ir_node   *addr     = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in,
4082                                                         arrent);
4083                         create_dynamic_null_initializer(arrent, dbgi, addr);
4084                 }
4085                 return;
4086         }
4087
4088         ir_mode *value_mode = get_type_mode(ent_type);
4089         ir_node *node       = new_Const(get_mode_null(value_mode));
4090
4091         /* is it a bitfield type? */
4092         if (is_Primitive_type(ent_type) &&
4093                         get_primitive_base_type(ent_type) != NULL) {
4094                 bitfield_store_to_firm(dbgi, entity, base_addr, node, false);
4095                 return;
4096         }
4097
4098         ir_node *mem    = get_store();
4099         ir_node *store  = new_d_Store(dbgi, mem, base_addr, node, cons_none);
4100         ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4101         set_store(proj_m);
4102 }
4103
4104 static void create_dynamic_initializer_sub(ir_initializer_t *initializer,
4105                 ir_entity *entity, ir_type *type, dbg_info *dbgi, ir_node *base_addr)
4106 {
4107         switch(get_initializer_kind(initializer)) {
4108         case IR_INITIALIZER_NULL:
4109                 create_dynamic_null_initializer(entity, dbgi, base_addr);
4110                 return;
4111         case IR_INITIALIZER_CONST: {
4112                 ir_node *node     = get_initializer_const_value(initializer);
4113                 ir_type *ent_type = get_entity_type(entity);
4114
4115                 /* is it a bitfield type? */
4116                 if (is_Primitive_type(ent_type) &&
4117                                 get_primitive_base_type(ent_type) != NULL) {
4118                         bitfield_store_to_firm(dbgi, entity, base_addr, node, false);
4119                         return;
4120                 }
4121
4122                 assert(get_type_mode(type) == get_irn_mode(node));
4123                 ir_node *mem    = get_store();
4124                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, node, cons_none);
4125                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4126                 set_store(proj_m);
4127                 return;
4128         }
4129         case IR_INITIALIZER_TARVAL: {
4130                 ir_tarval *tv       = get_initializer_tarval_value(initializer);
4131                 ir_node   *cnst     = new_d_Const(dbgi, tv);
4132                 ir_type   *ent_type = get_entity_type(entity);
4133
4134                 /* is it a bitfield type? */
4135                 if (is_Primitive_type(ent_type) &&
4136                                 get_primitive_base_type(ent_type) != NULL) {
4137                         bitfield_store_to_firm(dbgi, entity, base_addr, cnst, false);
4138                         return;
4139                 }
4140
4141                 assert(get_type_mode(type) == get_tarval_mode(tv));
4142                 ir_node *mem    = get_store();
4143                 ir_node *store  = new_d_Store(dbgi, mem, base_addr, cnst, cons_none);
4144                 ir_node *proj_m = new_Proj(store, mode_M, pn_Store_M);
4145                 set_store(proj_m);
4146                 return;
4147         }
4148         case IR_INITIALIZER_COMPOUND: {
4149                 assert(is_compound_type(type) || is_Array_type(type));
4150                 int n_members;
4151                 if (is_Array_type(type)) {
4152                         assert(has_array_upper_bound(type, 0));
4153                         n_members = get_array_upper_bound_int(type, 0);
4154                 } else {
4155                         n_members = get_compound_n_members(type);
4156                 }
4157
4158                 if (get_initializer_compound_n_entries(initializer)
4159                                 != (unsigned) n_members)
4160                         panic("initializer doesn't match compound type");
4161
4162                 for (int i = 0; i < n_members; ++i) {
4163                         ir_node   *addr;
4164                         ir_type   *irtype;
4165                         ir_entity *sub_entity;
4166                         if (is_Array_type(type)) {
4167                                 ir_tarval *index_tv = new_tarval_from_long(i, mode_uint);
4168                                 ir_node   *cnst     = new_d_Const(dbgi, index_tv);
4169                                 ir_node   *in[1]    = { cnst };
4170                                 irtype     = get_array_element_type(type);
4171                                 sub_entity = get_array_element_entity(type);
4172                                 addr       = new_d_Sel(dbgi, new_NoMem(), base_addr, 1, in,
4173                                                        sub_entity);
4174                         } else {
4175                                 sub_entity = get_compound_member(type, i);
4176                                 irtype     = get_entity_type(sub_entity);
4177                                 addr       = new_d_simpleSel(dbgi, new_NoMem(), base_addr,
4178                                                              sub_entity);
4179                         }
4180
4181                         ir_initializer_t *sub_init
4182                                 = get_initializer_compound_value(initializer, i);
4183
4184                         create_dynamic_initializer_sub(sub_init, sub_entity, irtype, dbgi,
4185                                                        addr);
4186                 }
4187                 return;
4188         }
4189         }
4190
4191         panic("invalid IR_INITIALIZER found");
4192 }
4193
4194 static void create_dynamic_initializer(ir_initializer_t *initializer,
4195                 dbg_info *dbgi, ir_entity *entity)
4196 {
4197         ir_node *frame     = get_irg_frame(current_ir_graph);
4198         ir_node *base_addr = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
4199         ir_type *type      = get_entity_type(entity);
4200
4201         create_dynamic_initializer_sub(initializer, entity, type, dbgi, base_addr);
4202 }
4203
4204 static void create_local_initializer(initializer_t *initializer, dbg_info *dbgi,
4205                                      ir_entity *entity, type_t *type)
4206 {
4207         ir_node *memory = get_store();
4208         ir_node *nomem  = new_NoMem();
4209         ir_node *frame  = get_irg_frame(current_ir_graph);
4210         ir_node *addr   = new_d_simpleSel(dbgi, nomem, frame, entity);
4211
4212         if (initializer->kind == INITIALIZER_VALUE) {
4213                 initializer_value_t *initializer_value = &initializer->value;
4214
4215                 ir_node *value = expression_to_firm(initializer_value->value);
4216                 type = skip_typeref(type);
4217                 assign_value(dbgi, addr, type, value);
4218                 return;
4219         }
4220
4221         if (is_constant_initializer(initializer) == EXPR_CLASS_VARIABLE) {
4222                 ir_initializer_t *irinitializer
4223                         = create_ir_initializer(initializer, type);
4224
4225                 create_dynamic_initializer(irinitializer, dbgi, entity);
4226                 return;
4227         }
4228
4229         /* create the ir_initializer */
4230         ir_graph *const old_current_ir_graph = current_ir_graph;
4231         current_ir_graph = get_const_code_irg();
4232
4233         ir_initializer_t *irinitializer = create_ir_initializer(initializer, type);
4234
4235         assert(current_ir_graph == get_const_code_irg());
4236         current_ir_graph = old_current_ir_graph;
4237
4238         /* create a "template" entity which is copied to the entity on the stack */
4239         ident     *const id          = id_unique("initializer.%u");
4240         ir_type   *const irtype      = get_ir_type(type);
4241         ir_type   *const global_type = get_glob_type();
4242         ir_entity *const init_entity = new_d_entity(global_type, id, irtype, dbgi);
4243         set_entity_ld_ident(init_entity, id);
4244
4245         set_entity_visibility(init_entity, ir_visibility_private);
4246         add_entity_linkage(init_entity, IR_LINKAGE_CONSTANT);
4247
4248         set_entity_initializer(init_entity, irinitializer);
4249
4250         ir_node *const src_addr = create_symconst(dbgi, init_entity);
4251         ir_node *const copyb    = new_d_CopyB(dbgi, memory, addr, src_addr, irtype);
4252
4253         ir_node *const copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M);
4254         set_store(copyb_mem);
4255 }
4256
4257 static void create_initializer_local_variable_entity(entity_t *entity)
4258 {
4259         assert(entity->kind == ENTITY_VARIABLE);
4260         initializer_t *initializer = entity->variable.initializer;
4261         dbg_info      *dbgi        = get_dbg_info(&entity->base.source_position);
4262         ir_entity     *irentity    = entity->variable.v.entity;
4263         type_t        *type        = entity->declaration.type;
4264
4265         create_local_initializer(initializer, dbgi, irentity, type);
4266 }
4267
4268 static void create_variable_initializer(entity_t *entity)
4269 {
4270         assert(entity->kind == ENTITY_VARIABLE);
4271         initializer_t *initializer = entity->variable.initializer;
4272         if (initializer == NULL)
4273                 return;
4274
4275         declaration_kind_t declaration_kind
4276                 = (declaration_kind_t) entity->declaration.kind;
4277         if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY) {
4278                 create_initializer_local_variable_entity(entity);
4279                 return;
4280         }
4281
4282         type_t            *type = entity->declaration.type;
4283         type_qualifiers_t  tq   = get_type_qualifier(type, true);
4284
4285         if (initializer->kind == INITIALIZER_VALUE) {
4286                 initializer_value_t *initializer_value = &initializer->value;
4287                 dbg_info            *dbgi = get_dbg_info(&entity->base.source_position);
4288
4289                 ir_node *value = expression_to_firm(initializer_value->value);
4290
4291                 type_t  *init_type = initializer_value->value->base.type;
4292                 ir_mode *mode      = get_ir_mode_storage(init_type);
4293                 value = create_conv(dbgi, value, mode);
4294                 value = do_strict_conv(dbgi, value);
4295
4296                 if (declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE) {
4297                         set_value(entity->variable.v.value_number, value);
4298                 } else {
4299                         assert(declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4300
4301                         ir_entity *irentity = entity->variable.v.entity;
4302
4303                         if (tq & TYPE_QUALIFIER_CONST
4304                                         && get_entity_owner(irentity) != get_tls_type()) {
4305                                 add_entity_linkage(irentity, IR_LINKAGE_CONSTANT);
4306                         }
4307                         set_atomic_ent_value(irentity, value);
4308                 }
4309         } else {
4310                 assert(declaration_kind == DECLARATION_KIND_LOCAL_VARIABLE_ENTITY ||
4311                        declaration_kind == DECLARATION_KIND_GLOBAL_VARIABLE);
4312
4313                 ir_entity        *irentity        = entity->variable.v.entity;
4314                 ir_initializer_t *irinitializer
4315                         = create_ir_initializer(initializer, type);
4316
4317                 if (tq & TYPE_QUALIFIER_CONST) {
4318                         add_entity_linkage(irentity, IR_LINKAGE_CONSTANT);
4319                 }
4320                 set_entity_initializer(irentity, irinitializer);
4321         }
4322 }
4323
4324 static void create_variable_length_array(entity_t *entity)
4325 {
4326         assert(entity->kind == ENTITY_VARIABLE);
4327         assert(entity->variable.initializer == NULL);
4328
4329         entity->declaration.kind    = DECLARATION_KIND_VARIABLE_LENGTH_ARRAY;
4330         entity->variable.v.vla_base = NULL;
4331
4332         /* TODO: record VLA somewhere so we create the free node when we leave
4333          * it's scope */
4334 }
4335
4336 static void allocate_variable_length_array(entity_t *entity)
4337 {
4338         assert(entity->kind == ENTITY_VARIABLE);
4339         assert(entity->variable.initializer == NULL);
4340         assert(currently_reachable());
4341
4342         dbg_info *dbgi      = get_dbg_info(&entity->base.source_position);
4343         type_t   *type      = entity->declaration.type;
4344         ir_type  *el_type   = get_ir_type(type->array.element_type);
4345
4346         /* make sure size_node is calculated */
4347         get_type_size_node(type);
4348         ir_node  *elems = type->array.size_node;
4349         ir_node  *mem   = get_store();
4350         ir_node  *alloc = new_d_Alloc(dbgi, mem, elems, el_type, stack_alloc);
4351
4352         ir_node  *proj_m = new_d_Proj(dbgi, alloc, mode_M, pn_Alloc_M);
4353         ir_node  *addr   = new_d_Proj(dbgi, alloc, mode_P_data, pn_Alloc_res);
4354         set_store(proj_m);
4355
4356         assert(entity->declaration.kind == DECLARATION_KIND_VARIABLE_LENGTH_ARRAY);
4357         entity->variable.v.vla_base = addr;
4358 }
4359
4360 /**
4361  * Creates a Firm local variable from a declaration.
4362  */
4363 static void create_local_variable(entity_t *entity)
4364 {
4365         assert(entity->kind == ENTITY_VARIABLE);
4366         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4367
4368         bool needs_entity = entity->variable.address_taken;
4369         type_t *type = skip_typeref(entity->declaration.type);
4370
4371         /* is it a variable length array? */
4372         if (is_type_array(type) && !type->array.size_constant) {
4373                 create_variable_length_array(entity);
4374                 return;
4375         } else if (is_type_array(type) || is_type_compound(type)) {
4376                 needs_entity = true;
4377         } else if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
4378                 needs_entity = true;
4379         }
4380
4381         if (needs_entity) {
4382                 ir_type *frame_type = get_irg_frame_type(current_ir_graph);
4383                 create_variable_entity(entity,
4384                                        DECLARATION_KIND_LOCAL_VARIABLE_ENTITY,
4385                                        frame_type);
4386         } else {
4387                 entity->declaration.kind        = DECLARATION_KIND_LOCAL_VARIABLE;
4388                 entity->variable.v.value_number = next_value_number_function;
4389                 set_irg_loc_description(current_ir_graph, next_value_number_function,
4390                                         entity);
4391                 ++next_value_number_function;
4392         }
4393 }
4394
4395 static void create_local_static_variable(entity_t *entity)
4396 {
4397         assert(entity->kind == ENTITY_VARIABLE);
4398         assert(entity->declaration.kind == DECLARATION_KIND_UNKNOWN);
4399
4400         type_t   *type           = skip_typeref(entity->declaration.type);
4401         ir_type  *const var_type = entity->variable.thread_local ?
4402                 get_tls_type() : get_glob_type();
4403         ir_type  *const irtype   = get_ir_type(type);
4404         dbg_info *const dbgi     = get_dbg_info(&entity->base.source_position);
4405
4406         size_t l = strlen(entity->base.symbol->string);
4407         char   buf[l + sizeof(".%u")];
4408         snprintf(buf, sizeof(buf), "%s.%%u", entity->base.symbol->string);
4409         ident     *const id       = id_unique(buf);
4410         ir_entity *const irentity = new_d_entity(var_type, id, irtype, dbgi);
4411
4412         if (type->base.qualifiers & TYPE_QUALIFIER_VOLATILE) {
4413                 set_entity_volatility(irentity, volatility_is_volatile);
4414         }
4415
4416         entity->declaration.kind  = DECLARATION_KIND_GLOBAL_VARIABLE;
4417         entity->variable.v.entity = irentity;
4418
4419         set_entity_ld_ident(irentity, id);
4420         set_entity_visibility(irentity, ir_visibility_local);
4421
4422         ir_graph *const old_current_ir_graph = current_ir_graph;
4423         current_ir_graph = get_const_code_irg();
4424
4425         create_variable_initializer(entity);
4426
4427         assert(current_ir_graph == get_const_code_irg());
4428         current_ir_graph = old_current_ir_graph;
4429 }
4430
4431
4432
4433 static void return_statement_to_firm(return_statement_t *statement)
4434 {
4435         if (!currently_reachable())
4436                 return;
4437
4438         dbg_info *dbgi        = get_dbg_info(&statement->base.source_position);
4439         type_t   *type        = current_function_entity->declaration.type;
4440         ir_type  *func_irtype = get_ir_type(type);
4441
4442         ir_node *in[1];
4443         int      in_len;
4444         if (get_method_n_ress(func_irtype) > 0) {
4445                 ir_type *res_type = get_method_res_type(func_irtype, 0);
4446
4447                 if (statement->value != NULL) {
4448                         ir_node *node = expression_to_firm(statement->value);
4449                         if (!is_compound_type(res_type)) {
4450                                 type_t  *ret_value_type = statement->value->base.type;
4451                                 ir_mode *mode           = get_ir_mode_storage(ret_value_type);
4452                                 node                    = create_conv(dbgi, node, mode);
4453                                 node                    = do_strict_conv(dbgi, node);
4454                         }
4455                         in[0] = node;
4456                 } else {
4457                         ir_mode *mode;
4458                         if (is_compound_type(res_type)) {
4459                                 mode = mode_P_data;
4460                         } else {
4461                                 mode = get_type_mode(res_type);
4462                         }
4463                         in[0] = new_Unknown(mode);
4464                 }
4465                 in_len = 1;
4466         } else {
4467                 /* build return_value for its side effects */
4468                 if (statement->value != NULL) {
4469                         expression_to_firm(statement->value);
4470                 }
4471                 in_len = 0;
4472         }
4473
4474         ir_node  *store = get_store();
4475         ir_node  *ret   = new_d_Return(dbgi, store, in_len, in);
4476
4477         ir_node *end_block = get_irg_end_block(current_ir_graph);
4478         add_immBlock_pred(end_block, ret);
4479
4480         set_unreachable_now();
4481 }
4482
4483 static ir_node *expression_statement_to_firm(expression_statement_t *statement)
4484 {
4485         if (!currently_reachable())
4486                 return NULL;
4487
4488         return expression_to_firm(statement->expression);
4489 }
4490
4491 static ir_node *compound_statement_to_firm(compound_statement_t *compound)
4492 {
4493         entity_t *entity = compound->scope.entities;
4494         for ( ; entity != NULL; entity = entity->base.next) {
4495                 if (!is_declaration(entity))
4496                         continue;
4497
4498                 create_local_declaration(entity);
4499         }
4500
4501         ir_node     *result    = NULL;
4502         statement_t *statement = compound->statements;
4503         for ( ; statement != NULL; statement = statement->base.next) {
4504                 if (statement->base.next == NULL
4505                                 && statement->kind == STATEMENT_EXPRESSION) {
4506                         result = expression_statement_to_firm(
4507                                         &statement->expression);
4508                         break;
4509                 }
4510                 statement_to_firm(statement);
4511         }
4512
4513         return result;
4514 }
4515
4516 static void create_global_variable(entity_t *entity)
4517 {
4518         ir_linkage    linkage    = IR_LINKAGE_DEFAULT;
4519         ir_visibility visibility = ir_visibility_default;
4520         ir_entity    *irentity;
4521         assert(entity->kind == ENTITY_VARIABLE);
4522
4523         switch ((storage_class_tag_t)entity->declaration.storage_class) {
4524         case STORAGE_CLASS_EXTERN: visibility = ir_visibility_external; break;
4525         case STORAGE_CLASS_STATIC: visibility = ir_visibility_local;    break;
4526         case STORAGE_CLASS_NONE:
4527                 visibility = ir_visibility_default;
4528                 /* uninitialized globals get merged in C */
4529                 if (entity->variable.initializer == NULL)
4530                         linkage |= IR_LINKAGE_MERGE;
4531                 break;
4532         case STORAGE_CLASS_TYPEDEF:
4533         case STORAGE_CLASS_AUTO:
4534         case STORAGE_CLASS_REGISTER:
4535                 panic("invalid storage class for global var");
4536         }
4537
4538         ir_type *var_type = get_glob_type();
4539         if (entity->variable.thread_local) {
4540                 var_type = get_tls_type();
4541                 /* LINKAGE_MERGE not supported by current linkers */
4542                 linkage &= ~IR_LINKAGE_MERGE;
4543         }
4544         create_variable_entity(entity, DECLARATION_KIND_GLOBAL_VARIABLE, var_type);
4545         irentity = entity->variable.v.entity;
4546         add_entity_linkage(irentity, linkage);
4547         set_entity_visibility(irentity, visibility);
4548 }
4549
4550 static void create_local_declaration(entity_t *entity)
4551 {
4552         assert(is_declaration(entity));
4553
4554         /* construct type */
4555         (void) get_ir_type(entity->declaration.type);
4556         if (entity->base.symbol == NULL) {
4557                 return;
4558         }
4559
4560         switch ((storage_class_tag_t) entity->declaration.storage_class) {
4561         case STORAGE_CLASS_STATIC:
4562                 if (entity->kind == ENTITY_FUNCTION) {
4563                         (void)get_function_entity(entity, NULL);
4564                 } else {
4565                         create_local_static_variable(entity);
4566                 }
4567                 return;
4568         case STORAGE_CLASS_EXTERN:
4569                 if (entity->kind == ENTITY_FUNCTION) {
4570                         assert(entity->function.statement == NULL);
4571                         (void)get_function_entity(entity, NULL);
4572                 } else {
4573                         create_global_variable(entity);
4574                         create_variable_initializer(entity);
4575                 }
4576                 return;
4577         case STORAGE_CLASS_NONE:
4578         case STORAGE_CLASS_AUTO:
4579         case STORAGE_CLASS_REGISTER:
4580                 if (entity->kind == ENTITY_FUNCTION) {
4581                         if (entity->function.statement != NULL) {
4582                                 ir_type *owner = get_irg_frame_type(current_ir_graph);
4583                                 (void)get_function_entity(entity, owner);
4584                                 entity->declaration.kind = DECLARATION_KIND_INNER_FUNCTION;
4585                                 enqueue_inner_function(entity);
4586                         } else {
4587                                 (void)get_function_entity(entity, NULL);
4588                         }
4589                 } else {
4590                         create_local_variable(entity);
4591                 }
4592                 return;
4593         case STORAGE_CLASS_TYPEDEF:
4594                 break;
4595         }
4596         panic("invalid storage class found");
4597 }
4598
4599 static void initialize_local_declaration(entity_t *entity)
4600 {
4601         if (entity->base.symbol == NULL)
4602                 return;
4603
4604         // no need to emit code in dead blocks
4605         if (entity->declaration.storage_class != STORAGE_CLASS_STATIC
4606                         && !currently_reachable())
4607                 return;
4608
4609         switch ((declaration_kind_t) entity->declaration.kind) {
4610         case DECLARATION_KIND_LOCAL_VARIABLE:
4611         case DECLARATION_KIND_LOCAL_VARIABLE_ENTITY:
4612                 create_variable_initializer(entity);
4613                 return;
4614
4615         case DECLARATION_KIND_VARIABLE_LENGTH_ARRAY:
4616                 allocate_variable_length_array(entity);
4617                 return;
4618
4619         case DECLARATION_KIND_COMPOUND_MEMBER:
4620         case DECLARATION_KIND_GLOBAL_VARIABLE:
4621         case DECLARATION_KIND_FUNCTION:
4622         case DECLARATION_KIND_INNER_FUNCTION:
4623                 return;
4624
4625         case DECLARATION_KIND_PARAMETER:
4626         case DECLARATION_KIND_PARAMETER_ENTITY:
4627                 panic("can't initialize parameters");
4628
4629         case DECLARATION_KIND_UNKNOWN:
4630                 panic("can't initialize unknown declaration");
4631         }
4632         panic("invalid declaration kind");
4633 }
4634
4635 static void declaration_statement_to_firm(declaration_statement_t *statement)
4636 {
4637         entity_t *entity = statement->declarations_begin;
4638         if (entity == NULL)
4639                 return;
4640
4641         entity_t *const last = statement->declarations_end;
4642         for ( ;; entity = entity->base.next) {
4643                 if (is_declaration(entity)) {
4644                         initialize_local_declaration(entity);
4645                 } else if (entity->kind == ENTITY_TYPEDEF) {
4646                         /* §6.7.7:3  Any array size expressions associated with variable length
4647                          * array declarators are evaluated each time the declaration of the
4648                          * typedef name is reached in the order of execution. */
4649                         type_t *const type = skip_typeref(entity->typedefe.type);
4650                         if (is_type_array(type) && type->array.is_vla)
4651                                 get_vla_size(&type->array);
4652                 }
4653                 if (entity == last)
4654                         break;
4655         }
4656 }
4657
4658 static void if_statement_to_firm(if_statement_t *statement)
4659 {
4660         /* Create the condition. */
4661         ir_node *true_block  = NULL;
4662         ir_node *false_block = NULL;
4663         if (currently_reachable()) {
4664                 true_block  = new_immBlock();
4665                 false_block = new_immBlock();
4666                 create_condition_evaluation(statement->condition, true_block, false_block);
4667                 mature_immBlock(true_block);
4668         }
4669
4670         /* Create the false statement.
4671          * Handle false before true, so if no false statement is present, then the
4672          * empty false block is reused as fallthrough block. */
4673         ir_node *fallthrough_block = NULL;
4674         if (statement->false_statement != NULL) {
4675                 if (false_block != NULL) {
4676                         mature_immBlock(false_block);
4677                 }
4678                 set_cur_block(false_block);
4679                 statement_to_firm(statement->false_statement);
4680                 if (currently_reachable()) {
4681                         fallthrough_block = new_immBlock();
4682                         add_immBlock_pred(fallthrough_block, new_Jmp());
4683                 }
4684         } else {
4685                 fallthrough_block = false_block;
4686         }
4687
4688         /* Create the true statement. */
4689         set_cur_block(true_block);
4690         statement_to_firm(statement->true_statement);
4691         if (currently_reachable()) {
4692                 if (fallthrough_block == NULL) {
4693                         fallthrough_block = new_immBlock();
4694                 }
4695                 add_immBlock_pred(fallthrough_block, new_Jmp());
4696         }
4697
4698         /* Handle the block after the if-statement. */
4699         if (fallthrough_block != NULL) {
4700                 mature_immBlock(fallthrough_block);
4701         }
4702         set_cur_block(fallthrough_block);
4703 }
4704
4705 /* Create a jump node which jumps into target_block, if the current block is
4706  * reachable. */
4707 static void jump_if_reachable(ir_node *const target_block)
4708 {
4709         ir_node *const pred = currently_reachable() ? new_Jmp() : new_Bad(mode_X);
4710         add_immBlock_pred(target_block, pred);
4711 }
4712
4713 static void while_statement_to_firm(while_statement_t *statement)
4714 {
4715         /* Create the header block */
4716         ir_node *const header_block = new_immBlock();
4717         jump_if_reachable(header_block);
4718
4719         /* Create the condition. */
4720         ir_node      *      body_block;
4721         ir_node      *      false_block;
4722         expression_t *const cond = statement->condition;
4723         if (is_constant_expression(cond) == EXPR_CLASS_CONSTANT &&
4724                         fold_constant_to_bool(cond)) {
4725                 /* Shortcut for while (true). */
4726                 body_block  = header_block;
4727                 false_block = NULL;
4728
4729                 keep_alive(header_block);
4730                 keep_all_memory(header_block);
4731         } else {
4732                 body_block  = new_immBlock();
4733                 false_block = new_immBlock();
4734
4735                 set_cur_block(header_block);
4736                 create_condition_evaluation(cond, body_block, false_block);
4737                 mature_immBlock(body_block);
4738         }
4739
4740         ir_node *const old_continue_label = continue_label;
4741         ir_node *const old_break_label    = break_label;
4742         continue_label = header_block;
4743         break_label    = false_block;
4744
4745         /* Create the loop body. */
4746         set_cur_block(body_block);
4747         statement_to_firm(statement->body);
4748         jump_if_reachable(header_block);
4749
4750         mature_immBlock(header_block);
4751         assert(false_block == NULL || false_block == break_label);
4752         false_block = break_label;
4753         if (false_block != NULL) {
4754                 mature_immBlock(false_block);
4755         }
4756         set_cur_block(false_block);
4757
4758         assert(continue_label == header_block);
4759         continue_label = old_continue_label;
4760         break_label    = old_break_label;
4761 }
4762
4763 static ir_node *get_break_label(void)
4764 {
4765         if (break_label == NULL) {
4766                 break_label = new_immBlock();
4767         }
4768         return break_label;
4769 }
4770
4771 static void do_while_statement_to_firm(do_while_statement_t *statement)
4772 {
4773         /* create the header block */
4774         ir_node *header_block = new_immBlock();
4775
4776         /* the loop body */
4777         ir_node *body_block = new_immBlock();
4778         jump_if_reachable(body_block);
4779
4780         ir_node *old_continue_label = continue_label;
4781         ir_node *old_break_label    = break_label;
4782         continue_label              = header_block;
4783         break_label                 = NULL;
4784
4785         set_cur_block(body_block);
4786         statement_to_firm(statement->body);
4787         ir_node *const false_block = get_break_label();
4788
4789         assert(continue_label == header_block);
4790         continue_label = old_continue_label;
4791         break_label    = old_break_label;
4792
4793         jump_if_reachable(header_block);
4794
4795         /* create the condition */
4796         mature_immBlock(header_block);
4797         set_cur_block(header_block);
4798
4799         create_condition_evaluation(statement->condition, body_block, false_block);
4800         mature_immBlock(body_block);
4801         mature_immBlock(false_block);
4802
4803         set_cur_block(false_block);
4804 }
4805
4806 static void for_statement_to_firm(for_statement_t *statement)
4807 {
4808         /* create declarations */
4809         entity_t *entity = statement->scope.entities;
4810         for ( ; entity != NULL; entity = entity->base.next) {
4811                 if (!is_declaration(entity))
4812                         continue;
4813
4814                 create_local_declaration(entity);
4815         }
4816
4817         if (currently_reachable()) {
4818                 entity = statement->scope.entities;
4819                 for ( ; entity != NULL; entity = entity->base.next) {
4820                         if (!is_declaration(entity))
4821                                 continue;
4822
4823                         initialize_local_declaration(entity);
4824                 }
4825
4826                 if (statement->initialisation != NULL) {
4827                         expression_to_firm(statement->initialisation);
4828                 }
4829         }
4830
4831         /* Create the header block */
4832         ir_node *const header_block = new_immBlock();
4833         jump_if_reachable(header_block);
4834
4835         /* Create the condition. */
4836         ir_node *body_block;
4837         ir_node *false_block;
4838         if (statement->condition != NULL) {
4839                 body_block  = new_immBlock();
4840                 false_block = new_immBlock();
4841
4842                 set_cur_block(header_block);
4843                 create_condition_evaluation(statement->condition, body_block, false_block);
4844                 mature_immBlock(body_block);
4845         } else {
4846                 /* for-ever. */
4847                 body_block  = header_block;
4848                 false_block = NULL;
4849
4850                 keep_alive(header_block);
4851                 keep_all_memory(header_block);
4852         }
4853
4854         /* Create the step block, if necessary. */
4855         ir_node      *      step_block = header_block;
4856         expression_t *const step       = statement->step;
4857         if (step != NULL) {
4858                 step_block = new_immBlock();
4859         }
4860
4861         ir_node *const old_continue_label = continue_label;
4862         ir_node *const old_break_label    = break_label;
4863         continue_label = step_block;
4864         break_label    = false_block;
4865
4866         /* Create the loop body. */
4867         set_cur_block(body_block);
4868         statement_to_firm(statement->body);
4869         jump_if_reachable(step_block);
4870
4871         /* Create the step code. */
4872         if (step != NULL) {
4873                 mature_immBlock(step_block);
4874                 set_cur_block(step_block);
4875                 expression_to_firm(step);
4876                 jump_if_reachable(header_block);
4877         }
4878
4879         mature_immBlock(header_block);
4880         assert(false_block == NULL || false_block == break_label);
4881         false_block = break_label;
4882         if (false_block != NULL) {
4883                 mature_immBlock(false_block);
4884         }
4885         set_cur_block(false_block);
4886
4887         assert(continue_label == step_block);
4888         continue_label = old_continue_label;
4889         break_label    = old_break_label;
4890 }
4891
4892 static void create_jump_statement(const statement_t *statement,
4893                                   ir_node *target_block)
4894 {
4895         if (!currently_reachable())
4896                 return;
4897
4898         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
4899         ir_node  *jump = new_d_Jmp(dbgi);
4900         add_immBlock_pred(target_block, jump);
4901
4902         set_unreachable_now();
4903 }
4904
4905 static void switch_statement_to_firm(switch_statement_t *statement)
4906 {
4907         ir_node  *first_block = NULL;
4908         dbg_info *dbgi        = get_dbg_info(&statement->base.source_position);
4909         ir_node  *cond        = NULL;
4910
4911         if (currently_reachable()) {
4912                 ir_node *expression = expression_to_firm(statement->expression);
4913                 cond                = new_d_Cond(dbgi, expression);
4914                 first_block         = get_cur_block();
4915         }
4916
4917         set_unreachable_now();
4918
4919         ir_node *const old_switch_cond       = current_switch_cond;
4920         ir_node *const old_break_label       = break_label;
4921         const bool     old_saw_default_label = saw_default_label;
4922         saw_default_label                    = false;
4923         current_switch_cond                  = cond;
4924         break_label                          = NULL;
4925         switch_statement_t *const old_switch = current_switch;
4926         current_switch                       = statement;
4927
4928         /* determine a free number for the default label */
4929         unsigned long num_cases       = 0;
4930         long          default_proj_nr = 0;
4931         for (case_label_statement_t *l = statement->first_case; l != NULL; l = l->next) {
4932                 if (l->expression == NULL) {
4933                         /* default case */
4934                         continue;
4935                 }
4936                 if (l->last_case >= l->first_case)
4937                         num_cases += l->last_case - l->first_case + 1;
4938                 if (l->last_case > default_proj_nr)
4939                         default_proj_nr = l->last_case;
4940         }
4941
4942         if (default_proj_nr == LONG_MAX) {
4943                 /* Bad: an overflow will occur, we cannot be sure that the
4944                  * maximum + 1 is a free number. Scan the values a second
4945                  * time to find a free number.
4946                  */
4947                 unsigned char *bits = xmalloc((num_cases + 7) >> 3);
4948
4949                 memset(bits, 0, (num_cases + 7) >> 3);
4950                 for (case_label_statement_t *l = statement->first_case; l != NULL; l = l->next) {
4951                         if (l->expression == NULL) {
4952                                 /* default case */
4953                                 continue;
4954                         }
4955                         unsigned long start = l->first_case > 0 ? (unsigned long)l->first_case : 0;
4956                         if (start < num_cases && l->last_case >= 0) {
4957                                 unsigned long end  = (unsigned long)l->last_case < num_cases ?
4958                                         (unsigned long)l->last_case : num_cases - 1;
4959                                 for (unsigned long cns = start; cns <= end; ++cns) {
4960                                         bits[cns >> 3] |= (1 << (cns & 7));
4961                                 }
4962                         }
4963                 }
4964                 /* We look at the first num_cases constants:
4965                  * Either they are dense, so we took the last (num_cases)
4966                  * one, or they are not dense, so we will find one free
4967                  * there...
4968                  */
4969                 unsigned long i;
4970                 for (i = 0; i < num_cases; ++i)
4971                         if ((bits[i >> 3] & (1 << (i & 7))) == 0)
4972                                 break;
4973
4974                 free(bits);
4975                 default_proj_nr = i;
4976         } else {
4977                 ++default_proj_nr;
4978         }
4979         statement->default_proj_nr = default_proj_nr;
4980         /* safety check: cond might already be folded to a Bad */
4981         if (cond != NULL && is_Cond(cond)) {
4982                 set_Cond_default_proj(cond, default_proj_nr);
4983         }
4984
4985         statement_to_firm(statement->body);
4986
4987         jump_if_reachable(get_break_label());
4988
4989         if (!saw_default_label && first_block != NULL) {
4990                 set_cur_block(first_block);
4991                 ir_node *const proj = new_d_Proj(dbgi, cond, mode_X, default_proj_nr);
4992                 add_immBlock_pred(get_break_label(), proj);
4993         }
4994
4995         if (break_label != NULL) {
4996                 mature_immBlock(break_label);
4997         }
4998         set_cur_block(break_label);
4999
5000         assert(current_switch_cond == cond);
5001         current_switch      = old_switch;
5002         current_switch_cond = old_switch_cond;
5003         break_label         = old_break_label;
5004         saw_default_label   = old_saw_default_label;
5005 }
5006
5007 static void case_label_to_firm(const case_label_statement_t *statement)
5008 {
5009         if (statement->is_empty_range)
5010                 return;
5011
5012         ir_node *block = new_immBlock();
5013         /* Fallthrough from previous case */
5014         jump_if_reachable(block);
5015
5016         if (current_switch_cond != NULL) {
5017                 set_cur_block(get_nodes_block(current_switch_cond));
5018                 dbg_info *const dbgi = get_dbg_info(&statement->base.source_position);
5019                 if (statement->expression != NULL) {
5020                         long pn     = statement->first_case;
5021                         long end_pn = statement->last_case;
5022                         assert(pn <= end_pn);
5023                         /* create jumps for all cases in the given range */
5024                         do {
5025                                 ir_node *const proj = new_d_Proj(dbgi, current_switch_cond, mode_X, pn);
5026                                 add_immBlock_pred(block, proj);
5027                         } while (pn++ < end_pn);
5028                 } else {
5029                         saw_default_label = true;
5030                         ir_node *const proj = new_d_Proj(dbgi, current_switch_cond, mode_X,
5031                                                          current_switch->default_proj_nr);
5032                         add_immBlock_pred(block, proj);
5033                 }
5034         }
5035
5036         mature_immBlock(block);
5037         set_cur_block(block);
5038
5039         statement_to_firm(statement->statement);
5040 }
5041
5042 static void label_to_firm(const label_statement_t *statement)
5043 {
5044         ir_node *block = get_label_block(statement->label);
5045         jump_if_reachable(block);
5046
5047         set_cur_block(block);
5048         keep_alive(block);
5049         keep_all_memory(block);
5050
5051         statement_to_firm(statement->statement);
5052 }
5053
5054 static void goto_to_firm(const goto_statement_t *statement)
5055 {
5056         if (!currently_reachable())
5057                 return;
5058
5059         if (statement->expression) {
5060                 ir_node  *irn  = expression_to_firm(statement->expression);
5061                 dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
5062                 ir_node  *ijmp = new_d_IJmp(dbgi, irn);
5063
5064                 set_irn_link(ijmp, ijmp_list);
5065                 ijmp_list = ijmp;
5066         } else {
5067                 ir_node *block = get_label_block(statement->label);
5068                 ir_node *jmp   = new_Jmp();
5069                 add_immBlock_pred(block, jmp);
5070         }
5071         set_unreachable_now();
5072 }
5073
5074 static void asm_statement_to_firm(const asm_statement_t *statement)
5075 {
5076         bool needs_memory = false;
5077
5078         if (statement->is_volatile) {
5079                 needs_memory = true;
5080         }
5081
5082         size_t         n_clobbers = 0;
5083         asm_clobber_t *clobber    = statement->clobbers;
5084         for ( ; clobber != NULL; clobber = clobber->next) {
5085                 const char *clobber_str = clobber->clobber.begin;
5086
5087                 if (!be_is_valid_clobber(clobber_str)) {
5088                         errorf(&statement->base.source_position,
5089                                    "invalid clobber '%s' specified", clobber->clobber);
5090                         continue;
5091                 }
5092
5093                 if (streq(clobber_str, "memory")) {
5094                         needs_memory = true;
5095                         continue;
5096                 }
5097
5098                 ident *id = new_id_from_str(clobber_str);
5099                 obstack_ptr_grow(&asm_obst, id);
5100                 ++n_clobbers;
5101         }
5102         assert(obstack_object_size(&asm_obst) == n_clobbers * sizeof(ident*));
5103         ident **clobbers = NULL;
5104         if (n_clobbers > 0) {
5105                 clobbers = obstack_finish(&asm_obst);
5106         }
5107
5108         size_t n_inputs  = 0;
5109         asm_argument_t *argument = statement->inputs;
5110         for ( ; argument != NULL; argument = argument->next)
5111                 n_inputs++;
5112         size_t n_outputs = 0;
5113         argument = statement->outputs;
5114         for ( ; argument != NULL; argument = argument->next)
5115                 n_outputs++;
5116
5117         unsigned next_pos = 0;
5118
5119         ir_node *ins[n_inputs + n_outputs + 1];
5120         size_t   in_size = 0;
5121
5122         ir_asm_constraint tmp_in_constraints[n_outputs];
5123
5124         const expression_t *out_exprs[n_outputs];
5125         ir_node            *out_addrs[n_outputs];
5126         size_t              out_size = 0;
5127
5128         argument = statement->outputs;
5129         for ( ; argument != NULL; argument = argument->next) {
5130                 const char *constraints = argument->constraints.begin;
5131                 asm_constraint_flags_t asm_flags
5132                         = be_parse_asm_constraints(constraints);
5133
5134                 {
5135                         source_position_t const *const pos = &statement->base.source_position;
5136                         if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
5137                                 warningf(WARN_OTHER, pos, "some constraints in '%s' are not supported", constraints);
5138                         }
5139                         if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
5140                                 errorf(pos, "some constraints in '%s' are invalid", constraints);
5141                                 continue;
5142                         }
5143                         if (! (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE)) {
5144                                 errorf(pos, "no write flag specified for output constraints '%s'", constraints);
5145                                 continue;
5146                         }
5147                 }
5148
5149                 unsigned pos = next_pos++;
5150                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
5151                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
5152                         expression_t *expr = argument->expression;
5153                         ir_node      *addr = expression_to_addr(expr);
5154                         /* in+output, construct an artifical same_as constraint on the
5155                          * input */
5156                         if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_READ) {
5157                                 char     buf[64];
5158                                 ir_node *value = get_value_from_lvalue(expr, addr);
5159
5160                                 snprintf(buf, sizeof(buf), "%u", (unsigned) out_size);
5161
5162                                 ir_asm_constraint constraint;
5163                                 constraint.pos              = pos;
5164                                 constraint.constraint       = new_id_from_str(buf);
5165                                 constraint.mode             = get_ir_mode_storage(expr->base.type);
5166                                 tmp_in_constraints[in_size] = constraint;
5167                                 ins[in_size] = value;
5168
5169                                 ++in_size;
5170                         }
5171
5172                         out_exprs[out_size] = expr;
5173                         out_addrs[out_size] = addr;
5174                         ++out_size;
5175                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
5176                         /* pure memory ops need no input (but we have to make sure we
5177                          * attach to the memory) */
5178                         assert(! (asm_flags &
5179                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
5180                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
5181                         needs_memory = true;
5182
5183                         /* we need to attach the address to the inputs */
5184                         expression_t *expr = argument->expression;
5185
5186                         ir_asm_constraint constraint;
5187                         constraint.pos              = pos;
5188                         constraint.constraint       = new_id_from_str(constraints);
5189                         constraint.mode             = NULL;
5190                         tmp_in_constraints[in_size] = constraint;
5191
5192                         ins[in_size]          = expression_to_addr(expr);
5193                         ++in_size;
5194                         continue;
5195                 } else {
5196                         errorf(&statement->base.source_position,
5197                                "only modifiers but no place set in constraints '%s'",
5198                                constraints);
5199                         continue;
5200                 }
5201
5202                 ir_asm_constraint constraint;
5203                 constraint.pos        = pos;
5204                 constraint.constraint = new_id_from_str(constraints);
5205                 constraint.mode       = get_ir_mode_storage(argument->expression->base.type);
5206
5207                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5208         }
5209         assert(obstack_object_size(&asm_obst)
5210                         == out_size * sizeof(ir_asm_constraint));
5211         ir_asm_constraint *output_constraints = obstack_finish(&asm_obst);
5212
5213
5214         obstack_grow(&asm_obst, tmp_in_constraints,
5215                      in_size * sizeof(tmp_in_constraints[0]));
5216         /* find and count input and output arguments */
5217         argument = statement->inputs;
5218         for ( ; argument != NULL; argument = argument->next) {
5219                 const char *constraints = argument->constraints.begin;
5220                 asm_constraint_flags_t asm_flags
5221                         = be_parse_asm_constraints(constraints);
5222
5223                 if (asm_flags & ASM_CONSTRAINT_FLAG_NO_SUPPORT) {
5224                         errorf(&statement->base.source_position,
5225                                "some constraints in '%s' are not supported", constraints);
5226                         continue;
5227                 }
5228                 if (asm_flags & ASM_CONSTRAINT_FLAG_INVALID) {
5229                         errorf(&statement->base.source_position,
5230                                "some constraints in '%s' are invalid", constraints);
5231                         continue;
5232                 }
5233                 if (asm_flags & ASM_CONSTRAINT_FLAG_MODIFIER_WRITE) {
5234                         errorf(&statement->base.source_position,
5235                                "write flag specified for input constraints '%s'",
5236                                constraints);
5237                         continue;
5238                 }
5239
5240                 ir_node *input;
5241                 if ( (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE)
5242                                 || (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER) ) {
5243                         /* we can treat this as "normal" input */
5244                         input = expression_to_firm(argument->expression);
5245                 } else if (asm_flags & ASM_CONSTRAINT_FLAG_SUPPORTS_MEMOP) {
5246                         /* pure memory ops need no input (but we have to make sure we
5247                          * attach to the memory) */
5248                         assert(! (asm_flags &
5249                                                 (ASM_CONSTRAINT_FLAG_SUPPORTS_IMMEDIATE
5250                                                  | ASM_CONSTRAINT_FLAG_SUPPORTS_REGISTER)));
5251                         needs_memory = true;
5252                         input = expression_to_addr(argument->expression);
5253                 } else {
5254                         errorf(&statement->base.source_position,
5255                                "only modifiers but no place set in constraints '%s'",
5256                                constraints);
5257                         continue;
5258                 }
5259
5260                 ir_asm_constraint constraint;
5261                 constraint.pos        = next_pos++;
5262                 constraint.constraint = new_id_from_str(constraints);
5263                 constraint.mode       = get_irn_mode(input);
5264
5265                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5266                 ins[in_size++] = input;
5267         }
5268
5269         if (needs_memory) {
5270                 ir_asm_constraint constraint;
5271                 constraint.pos        = next_pos++;
5272                 constraint.constraint = new_id_from_str("");
5273                 constraint.mode       = mode_M;
5274
5275                 obstack_grow(&asm_obst, &constraint, sizeof(constraint));
5276                 ins[in_size++] = get_store();
5277         }
5278
5279         assert(obstack_object_size(&asm_obst)
5280                         == in_size * sizeof(ir_asm_constraint));
5281         ir_asm_constraint *input_constraints = obstack_finish(&asm_obst);
5282
5283         /* create asm node */
5284         dbg_info *dbgi = get_dbg_info(&statement->base.source_position);
5285
5286         ident *asm_text = new_id_from_str(statement->asm_text.begin);
5287
5288         ir_node *node = new_d_ASM(dbgi, in_size, ins, input_constraints,
5289                                   out_size, output_constraints,
5290                                   n_clobbers, clobbers, asm_text);
5291
5292         if (statement->is_volatile) {
5293                 set_irn_pinned(node, op_pin_state_pinned);
5294         } else {
5295                 set_irn_pinned(node, op_pin_state_floats);
5296         }
5297
5298         /* create output projs & connect them */
5299         if (needs_memory) {
5300                 ir_node *projm = new_Proj(node, mode_M, out_size);
5301                 set_store(projm);
5302         }
5303
5304         size_t i;
5305         for (i = 0; i < out_size; ++i) {
5306                 const expression_t *out_expr = out_exprs[i];
5307                 long                pn       = i;
5308                 ir_mode            *mode     = get_ir_mode_storage(out_expr->base.type);
5309                 ir_node            *proj     = new_Proj(node, mode, pn);
5310                 ir_node            *addr     = out_addrs[i];
5311
5312                 set_value_for_expression_addr(out_expr, proj, addr);
5313         }
5314 }
5315
5316 static void ms_try_statement_to_firm(ms_try_statement_t *statement)
5317 {
5318         statement_to_firm(statement->try_statement);
5319         source_position_t const *const pos = &statement->base.source_position;
5320         warningf(WARN_OTHER, pos, "structured exception handling ignored");
5321 }
5322
5323 static void leave_statement_to_firm(leave_statement_t *statement)
5324 {
5325         errorf(&statement->base.source_position, "__leave not supported yet");
5326 }
5327
5328 /**
5329  * Transform a statement.
5330  */
5331 static void statement_to_firm(statement_t *statement)
5332 {
5333 #ifndef NDEBUG
5334         assert(!statement->base.transformed);
5335         statement->base.transformed = true;
5336 #endif
5337
5338         switch (statement->kind) {
5339         case STATEMENT_ERROR:
5340                 panic("error statement found");
5341         case STATEMENT_EMPTY:
5342                 /* nothing */
5343                 return;
5344         case STATEMENT_COMPOUND:
5345                 compound_statement_to_firm(&statement->compound);
5346                 return;
5347         case STATEMENT_RETURN:
5348                 return_statement_to_firm(&statement->returns);
5349                 return;
5350         case STATEMENT_EXPRESSION:
5351                 expression_statement_to_firm(&statement->expression);
5352                 return;
5353         case STATEMENT_IF:
5354                 if_statement_to_firm(&statement->ifs);
5355                 return;
5356         case STATEMENT_WHILE:
5357                 while_statement_to_firm(&statement->whiles);
5358                 return;
5359         case STATEMENT_DO_WHILE:
5360                 do_while_statement_to_firm(&statement->do_while);
5361                 return;
5362         case STATEMENT_DECLARATION:
5363                 declaration_statement_to_firm(&statement->declaration);
5364                 return;
5365         case STATEMENT_BREAK:
5366                 create_jump_statement(statement, get_break_label());
5367                 return;
5368         case STATEMENT_CONTINUE:
5369                 create_jump_statement(statement, continue_label);
5370                 return;
5371         case STATEMENT_SWITCH:
5372                 switch_statement_to_firm(&statement->switchs);
5373                 return;
5374         case STATEMENT_CASE_LABEL:
5375                 case_label_to_firm(&statement->case_label);
5376                 return;
5377         case STATEMENT_FOR:
5378                 for_statement_to_firm(&statement->fors);
5379                 return;
5380         case STATEMENT_LABEL:
5381                 label_to_firm(&statement->label);
5382                 return;
5383         case STATEMENT_GOTO:
5384                 goto_to_firm(&statement->gotos);
5385                 return;
5386         case STATEMENT_ASM:
5387                 asm_statement_to_firm(&statement->asms);
5388                 return;
5389         case STATEMENT_MS_TRY:
5390                 ms_try_statement_to_firm(&statement->ms_try);
5391                 return;
5392         case STATEMENT_LEAVE:
5393                 leave_statement_to_firm(&statement->leave);
5394                 return;
5395         }
5396         panic("statement not implemented");
5397 }
5398
5399 static int count_local_variables(const entity_t *entity,
5400                                  const entity_t *const last)
5401 {
5402         int count = 0;
5403         entity_t const *const end = last != NULL ? last->base.next : NULL;
5404         for (; entity != end; entity = entity->base.next) {
5405                 type_t *type;
5406                 bool    address_taken;
5407
5408                 if (entity->kind == ENTITY_VARIABLE) {
5409                         type          = skip_typeref(entity->declaration.type);
5410                         address_taken = entity->variable.address_taken;
5411                 } else if (entity->kind == ENTITY_PARAMETER) {
5412                         type          = skip_typeref(entity->declaration.type);
5413                         address_taken = entity->parameter.address_taken;
5414                 } else {
5415                         continue;
5416                 }
5417
5418                 if (!address_taken && is_type_scalar(type))
5419                         ++count;
5420         }
5421         return count;
5422 }
5423
5424 static void count_local_variables_in_stmt(statement_t *stmt, void *const env)
5425 {
5426         int *const count = env;
5427
5428         switch (stmt->kind) {
5429         case STATEMENT_DECLARATION: {
5430                 const declaration_statement_t *const decl_stmt = &stmt->declaration;
5431                 *count += count_local_variables(decl_stmt->declarations_begin,
5432                                 decl_stmt->declarations_end);
5433                 break;
5434         }
5435
5436         case STATEMENT_FOR:
5437                 *count += count_local_variables(stmt->fors.scope.entities, NULL);
5438                 break;
5439
5440         default:
5441                 break;
5442         }
5443 }
5444
5445 /**
5446  * Return the number of local (alias free) variables used by a function.
5447  */
5448 static int get_function_n_local_vars(entity_t *entity)
5449 {
5450         const function_t *function = &entity->function;
5451         int count = 0;
5452
5453         /* count parameters */
5454         count += count_local_variables(function->parameters.entities, NULL);
5455
5456         /* count local variables declared in body */
5457         walk_statements(function->statement, count_local_variables_in_stmt, &count);
5458         return count;
5459 }
5460
5461 /**
5462  * Build Firm code for the parameters of a function.
5463  */
5464 static void initialize_function_parameters(entity_t *entity)
5465 {
5466         assert(entity->kind == ENTITY_FUNCTION);
5467         ir_graph *irg             = current_ir_graph;
5468         ir_node  *args            = get_irg_args(irg);
5469         int       n               = 0;
5470         ir_type  *function_irtype;
5471
5472         if (entity->function.need_closure) {
5473                 /* add an extra parameter for the static link */
5474                 entity->function.static_link = new_r_Proj(args, mode_P_data, 0);
5475                 ++n;
5476
5477                 /* Matze: IMO this is wrong, nested functions should have an own
5478                  * type and not rely on strange parameters... */
5479                 function_irtype = create_method_type(&entity->declaration.type->function, true);
5480         } else {
5481                 function_irtype = get_ir_type(entity->declaration.type);
5482         }
5483
5484
5485
5486         entity_t *parameter = entity->function.parameters.entities;
5487         for ( ; parameter != NULL; parameter = parameter->base.next, ++n) {
5488                 if (parameter->kind != ENTITY_PARAMETER)
5489                         continue;
5490
5491                 assert(parameter->declaration.kind == DECLARATION_KIND_UNKNOWN);
5492                 type_t *type = skip_typeref(parameter->declaration.type);
5493
5494                 bool needs_entity = parameter->parameter.address_taken;
5495                 assert(!is_type_array(type));
5496                 if (is_type_compound(type)) {
5497                         needs_entity = true;
5498                 }
5499
5500                 ir_type *param_irtype = get_method_param_type(function_irtype, n);
5501                 if (needs_entity) {
5502                         ir_type   *frame_type = get_irg_frame_type(irg);
5503                         ir_entity *param
5504                                 = new_parameter_entity(frame_type, n, param_irtype);
5505                         parameter->declaration.kind
5506                                 = DECLARATION_KIND_PARAMETER_ENTITY;
5507                         parameter->parameter.v.entity = param;
5508                         continue;
5509                 }
5510
5511                 ir_mode *param_mode = get_type_mode(param_irtype);
5512                 long     pn         = n;
5513                 ir_node *value      = new_r_Proj(args, param_mode, pn);
5514
5515                 ir_mode *mode = get_ir_mode_storage(type);
5516                 value = create_conv(NULL, value, mode);
5517                 value = do_strict_conv(NULL, value);
5518
5519                 parameter->declaration.kind         = DECLARATION_KIND_PARAMETER;
5520                 parameter->parameter.v.value_number = next_value_number_function;
5521                 set_irg_loc_description(current_ir_graph, next_value_number_function,
5522                                         parameter);
5523                 ++next_value_number_function;
5524
5525                 set_value(parameter->parameter.v.value_number, value);
5526         }
5527 }
5528
5529 /**
5530  * Handle additional decl modifiers for IR-graphs
5531  *
5532  * @param irg            the IR-graph
5533  * @param dec_modifiers  additional modifiers
5534  */
5535 static void handle_decl_modifier_irg(ir_graph_ptr irg,
5536                                      decl_modifiers_t decl_modifiers)
5537 {
5538         if (decl_modifiers & DM_NAKED) {
5539                 /* TRUE if the declaration includes the Microsoft
5540                    __declspec(naked) specifier. */
5541                 add_irg_additional_properties(irg, mtp_property_naked);
5542         }
5543         if (decl_modifiers & DM_FORCEINLINE) {
5544                 /* TRUE if the declaration includes the
5545                    Microsoft __forceinline specifier. */
5546                 set_irg_inline_property(irg, irg_inline_forced);
5547         }
5548         if (decl_modifiers & DM_NOINLINE) {
5549                 /* TRUE if the declaration includes the Microsoft
5550                    __declspec(noinline) specifier. */
5551                 set_irg_inline_property(irg, irg_inline_forbidden);
5552         }
5553 }
5554
5555 static void add_function_pointer(ir_type *segment, ir_entity *method,
5556                                  const char *unique_template)
5557 {
5558         ir_type   *method_type  = get_entity_type(method);
5559         ir_type   *ptr_type     = new_type_pointer(method_type);
5560
5561         /* these entities don't really have a name but firm only allows
5562          * "" in ld_ident.
5563          * Note that we mustn't give these entities a name since for example
5564          * Mach-O doesn't allow them. */
5565         ident     *ide          = id_unique(unique_template);
5566         ir_entity *ptr          = new_entity(segment, ide, ptr_type);
5567         ir_graph  *irg          = get_const_code_irg();
5568         ir_node   *val          = new_rd_SymConst_addr_ent(NULL, irg, mode_P_code,
5569                                                            method);
5570
5571         set_entity_ld_ident(ptr, new_id_from_chars("", 0));
5572         set_entity_compiler_generated(ptr, 1);
5573         set_entity_visibility(ptr, ir_visibility_private);
5574         add_entity_linkage(ptr, IR_LINKAGE_CONSTANT|IR_LINKAGE_HIDDEN_USER);
5575         set_atomic_ent_value(ptr, val);
5576 }
5577
5578 /**
5579  * Generate possible IJmp branches to a given label block.
5580  */
5581 static void gen_ijmp_branches(ir_node *block)
5582 {
5583         ir_node *ijmp;
5584         for (ijmp = ijmp_list; ijmp != NULL; ijmp = get_irn_link(ijmp)) {
5585                 add_immBlock_pred(block, ijmp);
5586         }
5587 }
5588
5589 /**
5590  * Create code for a function and all inner functions.
5591  *
5592  * @param entity  the function entity
5593  */
5594 static void create_function(entity_t *entity)
5595 {
5596         assert(entity->kind == ENTITY_FUNCTION);
5597         ir_entity *function_entity = get_function_entity(entity, current_outer_frame);
5598
5599         if (entity->function.statement == NULL)
5600                 return;
5601
5602         if (is_main(entity) && enable_main_collect2_hack) {
5603                 prepare_main_collect2(entity);
5604         }
5605
5606         inner_functions     = NULL;
5607         current_trampolines = NULL;
5608
5609         if (entity->declaration.modifiers & DM_CONSTRUCTOR) {
5610                 ir_type *segment = get_segment_type(IR_SEGMENT_CONSTRUCTORS);
5611                 add_function_pointer(segment, function_entity, "constructor_ptr.%u");
5612         }
5613         if (entity->declaration.modifiers & DM_DESTRUCTOR) {
5614                 ir_type *segment = get_segment_type(IR_SEGMENT_DESTRUCTORS);
5615                 add_function_pointer(segment, function_entity, "destructor_ptr.%u");
5616         }
5617
5618         current_function_entity = entity;
5619         current_function_name   = NULL;
5620         current_funcsig         = NULL;
5621
5622         assert(all_labels == NULL);
5623         all_labels = NEW_ARR_F(label_t *, 0);
5624         ijmp_list  = NULL;
5625
5626         int       n_local_vars = get_function_n_local_vars(entity);
5627         ir_graph *irg          = new_ir_graph(function_entity, n_local_vars);
5628         current_ir_graph = irg;
5629
5630         ir_graph *old_current_function = current_function;
5631         current_function = irg;
5632
5633         ir_entity *const old_current_vararg_entity = current_vararg_entity;
5634         current_vararg_entity = NULL;
5635
5636         set_irg_fp_model(irg, firm_fp_model);
5637         tarval_enable_fp_ops(1);
5638         set_irn_dbg_info(get_irg_start_block(irg),
5639                          get_entity_dbg_info(function_entity));
5640
5641         ir_node *first_block = get_cur_block();
5642
5643         /* set inline flags */
5644         if (entity->function.is_inline)
5645                 set_irg_inline_property(irg, irg_inline_recomended);
5646         handle_decl_modifier_irg(irg, entity->declaration.modifiers);
5647
5648         next_value_number_function = 0;
5649         initialize_function_parameters(entity);
5650         current_static_link = entity->function.static_link;
5651
5652         statement_to_firm(entity->function.statement);
5653
5654         ir_node *end_block = get_irg_end_block(irg);
5655
5656         /* do we have a return statement yet? */
5657         if (currently_reachable()) {
5658                 type_t *type = skip_typeref(entity->declaration.type);
5659                 assert(is_type_function(type));
5660                 const function_type_t *func_type   = &type->function;
5661                 const type_t          *return_type
5662                         = skip_typeref(func_type->return_type);
5663
5664                 ir_node *ret;
5665                 if (is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
5666                         ret = new_Return(get_store(), 0, NULL);
5667                 } else {
5668                         ir_mode *mode;
5669                         if (is_type_scalar(return_type)) {
5670                                 mode = get_ir_mode_storage(func_type->return_type);
5671                         } else {
5672                                 mode = mode_P_data;
5673                         }
5674
5675                         ir_node *in[1];
5676                         /* §5.1.2.2.3 main implicitly returns 0 */
5677                         if (is_main(entity)) {
5678                                 in[0] = new_Const(get_mode_null(mode));
5679                         } else {
5680                                 in[0] = new_Unknown(mode);
5681                         }
5682                         ret = new_Return(get_store(), 1, in);
5683                 }
5684                 add_immBlock_pred(end_block, ret);
5685         }
5686
5687         bool has_computed_gotos = false;
5688         for (int i = ARR_LEN(all_labels) - 1; i >= 0; --i) {
5689                 label_t *label = all_labels[i];
5690                 if (label->address_taken) {
5691                         gen_ijmp_branches(label->block);
5692                         has_computed_gotos = true;
5693                 }
5694                 mature_immBlock(label->block);
5695         }
5696         if (has_computed_gotos) {
5697                 /* if we have computed goto's in the function, we cannot inline it */
5698                 if (get_irg_inline_property(irg) >= irg_inline_recomended) {
5699                         source_position_t const *const pos = &entity->base.source_position;
5700                         warningf(WARN_OTHER, pos, "'%N' can never be inlined because it contains a computed goto", entity);
5701                 }
5702                 set_irg_inline_property(irg, irg_inline_forbidden);
5703         }
5704
5705         DEL_ARR_F(all_labels);
5706         all_labels = NULL;
5707
5708         mature_immBlock(first_block);
5709         mature_immBlock(end_block);
5710
5711         irg_finalize_cons(irg);
5712
5713         /* finalize the frame type */
5714         ir_type *frame_type = get_irg_frame_type(irg);
5715         int      n          = get_compound_n_members(frame_type);
5716         int      align_all  = 4;
5717         int      offset     = 0;
5718         for (int i = 0; i < n; ++i) {
5719                 ir_entity *member      = get_compound_member(frame_type, i);
5720                 ir_type   *entity_type = get_entity_type(member);
5721
5722                 int align = get_type_alignment_bytes(entity_type);
5723                 if (align > align_all)
5724                         align_all = align;
5725                 int misalign = 0;
5726                 if (align > 0) {
5727                         misalign  = offset % align;
5728                         if (misalign > 0) {
5729                                 offset += align - misalign;
5730                         }
5731                 }
5732
5733                 set_entity_offset(member, offset);
5734                 offset += get_type_size_bytes(entity_type);
5735         }
5736         set_type_size_bytes(frame_type, offset);
5737         set_type_alignment_bytes(frame_type, align_all);
5738
5739         irg_verify(irg, VERIFY_ENFORCE_SSA);
5740         current_vararg_entity = old_current_vararg_entity;
5741         current_function      = old_current_function;
5742
5743         if (current_trampolines != NULL) {
5744                 DEL_ARR_F(current_trampolines);
5745                 current_trampolines = NULL;
5746         }
5747
5748         /* create inner functions if any */
5749         entity_t **inner = inner_functions;
5750         if (inner != NULL) {
5751                 ir_type *rem_outer_frame      = current_outer_frame;
5752                 current_outer_frame           = get_irg_frame_type(current_ir_graph);
5753                 for (int i = ARR_LEN(inner) - 1; i >= 0; --i) {
5754                         create_function(inner[i]);
5755                 }
5756                 DEL_ARR_F(inner);
5757
5758                 current_outer_frame      = rem_outer_frame;
5759         }
5760 }
5761
5762 static void scope_to_firm(scope_t *scope)
5763 {
5764         /* first pass: create declarations */
5765         entity_t *entity = scope->entities;
5766         for ( ; entity != NULL; entity = entity->base.next) {
5767                 if (entity->base.symbol == NULL)
5768                         continue;
5769
5770                 if (entity->kind == ENTITY_FUNCTION) {
5771                         if (entity->function.btk != BUILTIN_NONE) {
5772                                 /* builtins have no representation */
5773                                 continue;
5774                         }
5775                         (void)get_function_entity(entity, NULL);
5776                 } else if (entity->kind == ENTITY_VARIABLE) {
5777                         create_global_variable(entity);
5778                 } else if (entity->kind == ENTITY_NAMESPACE) {
5779                         scope_to_firm(&entity->namespacee.members);
5780                 }
5781         }
5782
5783         /* second pass: create code/initializers */
5784         entity = scope->entities;
5785         for ( ; entity != NULL; entity = entity->base.next) {
5786                 if (entity->base.symbol == NULL)
5787                         continue;
5788
5789                 if (entity->kind == ENTITY_FUNCTION) {
5790                         if (entity->function.btk != BUILTIN_NONE) {
5791                                 /* builtins have no representation */
5792                                 continue;
5793                         }
5794                         create_function(entity);
5795                 } else if (entity->kind == ENTITY_VARIABLE) {
5796                         assert(entity->declaration.kind
5797                                         == DECLARATION_KIND_GLOBAL_VARIABLE);
5798                         current_ir_graph = get_const_code_irg();
5799                         create_variable_initializer(entity);
5800                 }
5801         }
5802 }
5803
5804 void init_ast2firm(void)
5805 {
5806         obstack_init(&asm_obst);
5807         init_atomic_modes();
5808
5809         ir_set_debug_retrieve(dbg_retrieve);
5810         ir_set_type_debug_retrieve(dbg_print_type_dbg_info);
5811
5812         /* create idents for all known runtime functions */
5813         for (size_t i = 0; i < lengthof(rts_data); ++i) {
5814                 rts_idents[i] = new_id_from_str(rts_data[i].name);
5815         }
5816
5817         entitymap_init(&entitymap);
5818 }
5819
5820 static void init_ir_types(void)
5821 {
5822         static int ir_types_initialized = 0;
5823         if (ir_types_initialized)
5824                 return;
5825         ir_types_initialized = 1;
5826
5827         ir_type_int        = get_ir_type(type_int);
5828         ir_type_char       = get_ir_type(type_char);
5829         ir_type_const_char = get_ir_type(type_const_char);
5830         ir_type_wchar_t    = get_ir_type(type_wchar_t);
5831         ir_type_void       = get_ir_type(type_void);
5832
5833         be_params             = be_get_backend_param();
5834         mode_float_arithmetic = be_params->mode_float_arithmetic;
5835
5836         stack_param_align     = be_params->stack_param_align;
5837 }
5838
5839 void exit_ast2firm(void)
5840 {
5841         entitymap_destroy(&entitymap);
5842         obstack_free(&asm_obst, NULL);
5843 }
5844
5845 static void global_asm_to_firm(statement_t *s)
5846 {
5847         for (; s != NULL; s = s->base.next) {
5848                 assert(s->kind == STATEMENT_ASM);
5849
5850                 char const *const text = s->asms.asm_text.begin;
5851                 size_t            size = s->asms.asm_text.size;
5852
5853                 /* skip the last \0 */
5854                 if (text[size - 1] == '\0')
5855                         --size;
5856
5857                 ident *const id = new_id_from_chars(text, size);
5858                 add_irp_asm(id);
5859         }
5860 }
5861
5862 void translation_unit_to_firm(translation_unit_t *unit)
5863 {
5864         /* initialize firm arithmetic */
5865         tarval_set_integer_overflow_mode(TV_OVERFLOW_WRAP);
5866         ir_set_uninitialized_local_variable_func(uninitialized_local_var);
5867
5868         /* just to be sure */
5869         continue_label           = NULL;
5870         break_label              = NULL;
5871         current_switch_cond      = NULL;
5872         current_translation_unit = unit;
5873
5874         init_ir_types();
5875
5876         scope_to_firm(&unit->scope);
5877         global_asm_to_firm(unit->global_asm);
5878
5879         current_ir_graph         = NULL;
5880         current_translation_unit = NULL;
5881 }