nsz Git - cparser/blob - ast2firm.c

   1 #include <config.h>
   2
   3 #define _GNU_SOURCE
   4
   5 #include <assert.h>
   6 #include <string.h>
   7 #include <stdbool.h>
   8
   9 #include <libfirm/firm.h>
  10 #include <libfirm/adt/obst.h>
  11
  12 #include "ast2firm.h"
  13
  14 #include "adt/error.h"
  15 #include "adt/array.h"
  16 #include "token_t.h"
  17 #include "type_t.h"
  18 #include "ast_t.h"
  19 #include "parser.h"
  20
  21 #define MAGIC_DEFAULT_PN_NUMBER     (long) -314159265
  22
  23 static ir_type *ir_type_const_char;
  24 static ir_type *ir_type_void;
  25 static ir_type *ir_type_int;
  26 static ir_type *ir_type_void_ptr;
  27
  28 static type_t *type_const_char;
  29 static type_t *type_void;
  30 static type_t *type_int;
  31
  32 static symbol_t *symbol_alloca;
  33
  34 static int       next_value_number_function;
  35 static ir_node  *continue_label;
  36 static ir_node  *break_label;
  37 static ir_node  *current_switch_cond;
  38 static bool      saw_default_label;
  39 static ir_node **imature_blocks;
  40
  41 static const declaration_t *current_function_decl;
  42 static ir_node             *current_function_name;
  43
  44 typedef enum declaration_type_t {
  45         DECLARATION_TYPE_UNKNOWN,
  46         DECLARATION_TYPE_FUNCTION,
  47         DECLARATION_TYPE_GLOBAL_VARIABLE,
  48         DECLARATION_TYPE_LOCAL_VARIABLE,
  49         DECLARATION_TYPE_LOCAL_VARIABLE_ENTITY,
  50         DECLARATION_TYPE_COMPOUND_MEMBER,
  51         DECLARATION_TYPE_LABEL_BLOCK,
  52         DECLARATION_TYPE_ENUM_ENTRY
  53 } declaration_type_t;
  54
  55 static ir_type *get_ir_type(type_t *type);
  56
  57 ir_node *uninitialized_local_var(ir_graph *irg, ir_mode *mode, int pos)
  58 {
  59         (void) pos;
  60 #if 0
  61         const declaration_t *declaration = & value_numbers[pos]->declaration;
  62
  63         print_warning_prefix(declaration->source_position);
  64         fprintf(stderr, "variable '%s' might be used uninitialized\n",
  65                         declaration->symbol->string);
  66 #endif
  67         fprintf(stderr, "Some variable might be used uninitialized\n");
  68         return new_r_Unknown(irg, mode);
  69 }
  70
  71 unsigned dbg_snprint(char *buf, unsigned len, const dbg_info *dbg)
  72 {
  73         const source_position_t *pos = (const source_position_t*) dbg;
  74         if(pos == NULL)
  75                 return 0;
  76         return (unsigned) snprintf(buf, len, "%s:%u", pos->input_name,
  77                                    pos->linenr);
  78 }
  79
  80 const char *retrieve_dbg(const dbg_info *dbg, unsigned *line)
  81 {
  82         const source_position_t *pos = (const source_position_t*) dbg;
  83         if(pos == NULL)
  84                 return NULL;
  85         if(line != NULL)
  86                 *line = pos->linenr;
  87         return pos->input_name;
  88 }
  89
  90 void init_ast2firm(void)
  91 {
  92         type_const_char = make_atomic_type(ATOMIC_TYPE_CHAR, TYPE_QUALIFIER_CONST);
  93         type_void       = make_atomic_type(ATOMIC_TYPE_VOID, TYPE_QUALIFIER_NONE);
  94         type_int        = make_atomic_type(ATOMIC_TYPE_INT,  TYPE_QUALIFIER_NONE);
  95
  96         ir_type_int        = get_ir_type(type_int);
  97         ir_type_const_char = get_ir_type(type_const_char);
  98         ir_type_void       = get_ir_type(type_int); /* we don't have a real void
  99                                                        type in firm */
 100         ir_type_void_ptr   = new_type_pointer(new_id_from_str("void_ptr"),
 101                                               ir_type_void, mode_P_data);
 102
 103         type_void->firm_type = ir_type_void;
 104
 105         symbol_alloca = symbol_table_insert("__builtin_alloca");
 106 }
 107
 108 void exit_ast2firm(void)
 109 {
 110 }
 111
 112 static unsigned unique_id = 0;
 113
 114 static ident *unique_ident(const char *tag)
 115 {
 116         char buf[256];
 117
 118         snprintf(buf, sizeof(buf), "%s.%u", tag, unique_id);
 119         unique_id++;
 120         return new_id_from_str(buf);
 121 }
 122
 123 static ir_mode *get_atomic_mode(const atomic_type_t* atomic_type)
 124 {
 125         switch(atomic_type->atype) {
 126         case ATOMIC_TYPE_SCHAR:
 127         case ATOMIC_TYPE_CHAR:
 128                 return mode_Bs;
 129         case ATOMIC_TYPE_UCHAR:
 130                 return mode_Bu;
 131         case ATOMIC_TYPE_SHORT:
 132                 return mode_Hs;
 133         case ATOMIC_TYPE_USHORT:
 134                 return mode_Hu;
 135         case ATOMIC_TYPE_LONG:
 136         case ATOMIC_TYPE_INT:
 137                 return mode_Is;
 138         case ATOMIC_TYPE_ULONG:
 139         case ATOMIC_TYPE_UINT:
 140                 return mode_Iu;
 141         case ATOMIC_TYPE_LONGLONG:
 142                 return mode_Ls;
 143         case ATOMIC_TYPE_ULONGLONG:
 144                 return mode_Lu;
 145         case ATOMIC_TYPE_FLOAT:
 146                 return mode_F;
 147         case ATOMIC_TYPE_DOUBLE:
 148                 return mode_D;
 149         case ATOMIC_TYPE_LONG_DOUBLE:
 150                 return mode_E;
 151         case ATOMIC_TYPE_BOOL:
 152                 return mode_b;
 153 #ifdef PROVIDE_COMPLEX
 154         case ATOMIC_TYPE_FLOAT_COMPLEX:
 155         case ATOMIC_TYPE_DOUBLE_COMPLEX:
 156         case ATOMIC_TYPE_LONG_DOUBLE_COMPLEX:
 157                 panic("complex lowering not implemented yet");
 158                 break;
 159         case ATOMIC_TYPE_FLOAT_IMAGINARY:
 160         case ATOMIC_TYPE_DOUBLE_IMAGINARY:
 161         case ATOMIC_TYPE_LONG_DOUBLE_IMAGINARY:
 162                 panic("imaginary lowering not implemented yet");
 163                 break;
 164 #endif
 165         case ATOMIC_TYPE_VOID:
 166                 /* firm has no real void... */
 167                 return mode_Is;
 168         case ATOMIC_TYPE_INVALID:
 169                 break;
 170         }
 171         panic("Encountered unknown atomic type");
 172 }
 173
 174
 175 static unsigned get_type_size(type_t *type);
 176
 177 static unsigned get_atomic_type_size(const atomic_type_t *type)
 178 {
 179         switch(type->atype) {
 180         case ATOMIC_TYPE_CHAR:
 181         case ATOMIC_TYPE_SCHAR:
 182         case ATOMIC_TYPE_UCHAR:
 183                 return 1;
 184
 185         case ATOMIC_TYPE_SHORT:
 186         case ATOMIC_TYPE_USHORT:
 187                 return 2;
 188
 189         case ATOMIC_TYPE_BOOL:
 190         case ATOMIC_TYPE_INT:
 191         case ATOMIC_TYPE_UINT:
 192         case ATOMIC_TYPE_LONG:
 193         case ATOMIC_TYPE_ULONG:
 194         case ATOMIC_TYPE_FLOAT:
 195                 return 4;
 196
 197         case ATOMIC_TYPE_LONGLONG:
 198         case ATOMIC_TYPE_ULONGLONG:
 199         case ATOMIC_TYPE_DOUBLE:
 200                 return 8;
 201
 202         case ATOMIC_TYPE_LONG_DOUBLE:
 203                 return 12;
 204
 205         case ATOMIC_TYPE_VOID:
 206                 return 1;
 207
 208         case ATOMIC_TYPE_INVALID:
 209                 break;
 210         }
 211         panic("Trying to determine size of invalid atomic type");
 212 }
 213
 214 static unsigned get_compound_type_size(compound_type_t *type)
 215 {
 216         ir_type *irtype = get_ir_type(&type->type);
 217         return get_type_size_bytes(irtype);
 218 }
 219
 220 static unsigned get_array_type_size(array_type_t *type)
 221 {
 222         ir_type *irtype = get_ir_type((type_t*) type);
 223         return get_type_size_bytes(irtype);
 224 }
 225
 226 static unsigned get_type_size(type_t *type)
 227 {
 228         type = skip_typeref(type);
 229
 230         switch(type->type) {
 231         case TYPE_ATOMIC:
 232                 return get_atomic_type_size((const atomic_type_t*) type);
 233         case TYPE_ENUM:
 234                 return get_mode_size_bytes(mode_Is);
 235         case TYPE_COMPOUND_UNION:
 236         case TYPE_COMPOUND_STRUCT:
 237                 return get_compound_type_size((compound_type_t*) type);
 238         case TYPE_FUNCTION:
 239                 /* just a pointer to the function */
 240                 return get_mode_size_bytes(mode_P_code);
 241         case TYPE_POINTER:
 242                 return get_mode_size_bytes(mode_P_data);
 243         case TYPE_ARRAY:
 244                 return get_array_type_size((array_type_t*) type);
 245         case TYPE_BUILTIN:
 246         case TYPE_TYPEDEF:
 247         case TYPE_TYPEOF:
 248         case TYPE_INVALID:
 249                 break;
 250         }
 251         panic("Trying to determine size of invalid type");
 252 }
 253
 254 static unsigned count_parameters(const function_type_t *function_type)
 255 {
 256         unsigned count = 0;
 257
 258         function_parameter_t *parameter = function_type->parameters;
 259         for ( ; parameter != NULL; parameter = parameter->next) {
 260                 ++count;
 261         }
 262
 263         return count;
 264 }
 265
 266
 267
 268
 269 static long fold_constant(const expression_t *expression);
 270
 271 static ir_type *create_atomic_type(const atomic_type_t *type)
 272 {
 273         ir_mode *mode   = get_atomic_mode(type);
 274         ident   *id     = get_mode_ident(mode);
 275         ir_type *irtype = new_type_primitive(id, mode);
 276
 277         return irtype;
 278 }
 279
 280 static ir_type *create_method_type(const function_type_t *function_type)
 281 {
 282         type_t  *result_type  = function_type->result_type;
 283
 284         ident   *id           = unique_ident("functiontype");
 285         int      n_parameters = count_parameters(function_type);
 286         int      n_results    = result_type == type_void ? 0 : 1;
 287         ir_type *irtype       = new_type_method(id, n_parameters, n_results);
 288
 289         if(result_type != type_void) {
 290                 ir_type *restype = get_ir_type(result_type);
 291                 set_method_res_type(irtype, 0, restype);
 292         }
 293
 294         function_parameter_t *parameter = function_type->parameters;
 295         int                   n         = 0;
 296         for( ; parameter != NULL; parameter = parameter->next) {
 297                 ir_type *p_irtype = get_ir_type(parameter->type);
 298                 set_method_param_type(irtype, n, p_irtype);
 299                 ++n;
 300         }
 301
 302         if(function_type->variadic || function_type->unspecified_parameters) {
 303                 set_method_variadicity(irtype, variadicity_variadic);
 304         }
 305
 306         return irtype;
 307 }
 308
 309 static ir_type *create_pointer_type(pointer_type_t *type)
 310 {
 311         type_t  *points_to = type->points_to;
 312         ir_type *ir_points_to;
 313         /* Avoid endless recursion if the points_to type contains this poiner type
 314          * again (might be a struct). We therefore first create a void* pointer
 315          * and then set the real points_to type
 316          */
 317         ir_type *ir_type = new_type_pointer(unique_ident("pointer"),
 318                                             ir_type_void, mode_P_data);
 319         type->type.firm_type  = ir_type;
 320
 321         ir_points_to = get_ir_type(points_to);
 322         set_pointer_points_to_type(ir_type, ir_points_to);
 323
 324         return ir_type;
 325 }
 326
 327 static ir_type *create_array_type(array_type_t *type)
 328 {
 329         type_t  *element_type    = type->element_type;
 330         ir_type *ir_element_type = get_ir_type(element_type);
 331
 332         ident   *id      = unique_ident("array");
 333         ir_type *ir_type = new_type_array(id, 1, ir_element_type);
 334
 335         if(type->size != NULL) {
 336                 int n_elements = fold_constant(type->size);
 337
 338                 set_array_bounds_int(ir_type, 0, 0, n_elements);
 339
 340                 size_t elemsize = get_type_size_bytes(ir_element_type);
 341                 int align = get_type_alignment_bytes(ir_element_type);
 342                 if(elemsize % align > 0) {
 343                         elemsize += align - (elemsize % align);
 344                 }
 345                 set_type_size_bytes(ir_type, n_elements * elemsize);
 346                 set_type_alignment_bytes(ir_type, align);
 347                 set_type_state(ir_type, layout_fixed);
 348         }
 349
 350         return ir_type;
 351 }
 352
 353 #define INVALID_TYPE ((ir_type_ptr)-1)
 354
 355 static ir_type *create_struct_type(compound_type_t *type)
 356 {
 357         symbol_t *symbol = type->declaration->symbol;
 358         ident    *id;
 359         if(symbol != NULL) {
 360                 id = unique_ident(symbol->string);
 361         } else {
 362                 id = unique_ident("__anonymous_struct");
 363         }
 364         ir_type *ir_type = new_type_struct(id);
 365
 366         type->type.firm_type = ir_type;
 367
 368         int align_all = 1;
 369         int offset    = 0;
 370         declaration_t *entry = type->declaration->context.declarations;
 371         for( ; entry != NULL; entry = entry->next) {
 372                 if(entry->namespc != NAMESPACE_NORMAL)
 373                         continue;
 374
 375                 ident       *ident         = new_id_from_str(entry->symbol->string);
 376                 ir_type_ptr  entry_ir_type = get_ir_type(entry->type);
 377
 378                 int entry_size      = get_type_size_bytes(entry_ir_type);
 379                 int entry_alignment = get_type_alignment_bytes(entry_ir_type);
 380                 int misalign        = offset % entry_alignment;
 381                 if (misalign != 0)
 382                         offset += entry_alignment - misalign;
 383
 384                 ir_entity *entity = new_entity(ir_type, ident, entry_ir_type);
 385                 set_entity_offset(entity, offset);
 386                 add_struct_member(ir_type, entity);
 387                 entry->declaration_type = DECLARATION_TYPE_COMPOUND_MEMBER;
 388                 entry->v.entity         = entity;
 389
 390                 offset += entry_size;
 391                 if(entry_alignment > align_all) {
 392                         if(entry_alignment % align_all != 0) {
 393                                 panic("Uneven alignments not supported yet");
 394                         }
 395                         align_all = entry_alignment;
 396                 }
 397         }
 398
 399         int misalign = offset % align_all;
 400         offset += misalign;
 401         set_type_alignment_bytes(ir_type, align_all);
 402         set_type_size_bytes(ir_type, offset);
 403         set_type_state(ir_type, layout_fixed);
 404
 405         return ir_type;
 406 }
 407
 408 static ir_type *create_union_type(compound_type_t *type)
 409 {
 410         declaration_t *declaration = type->declaration;
 411         symbol_t      *symbol      = declaration->symbol;
 412         ident         *id;
 413         if(symbol != NULL) {
 414                 id = unique_ident(symbol->string);
 415         } else {
 416                 id = unique_ident("__anonymous_union");
 417         }
 418         ir_type  *ir_type = new_type_union(id);
 419
 420         type->type.firm_type = ir_type;
 421
 422         int align_all = 1;
 423         int size      = 0;
 424         declaration_t *entry = declaration->context.declarations;
 425         for( ; entry != NULL; entry = entry->next) {
 426                 if(entry->namespc != NAMESPACE_NORMAL)
 427                         continue;
 428
 429                 ident       *ident         = new_id_from_str(entry->symbol->string);
 430                 ir_type_ptr  entry_ir_type = get_ir_type(entry->type);
 431
 432                 int entry_size      = get_type_size_bytes(entry_ir_type);
 433                 int entry_alignment = get_type_alignment_bytes(entry_ir_type);
 434
 435                 ir_entity *entity = new_entity(ir_type, ident, entry_ir_type);
 436                 add_union_member(ir_type, entity);
 437                 set_entity_offset(entity, 0);
 438                 entry->declaration_type = DECLARATION_TYPE_COMPOUND_MEMBER;
 439                 entry->v.entity         = entity;
 440
 441                 if(entry_size > size) {
 442                         size = entry_size;
 443                 }
 444                 if(entry_alignment > align_all) {
 445                         if(entry_alignment % align_all != 0) {
 446                                 panic("Uneven alignments not supported yet");
 447                         }
 448                         align_all = entry_alignment;
 449                 }
 450         }
 451
 452         set_type_alignment_bytes(ir_type, align_all);
 453         set_type_size_bytes(ir_type, size);
 454         set_type_state(ir_type, layout_fixed);
 455
 456         return ir_type;
 457 }
 458
 459 static ir_node *expression_to_firm(const expression_t *expression);
 460 static inline ir_mode *get_ir_mode(type_t *type);
 461
 462 static ir_type *create_enum_type(enum_type_t *const type)
 463 {
 464         type->type.firm_type = ir_type_int;
 465
 466         ir_mode *const mode    = get_ir_mode((type_t*) type);
 467         tarval  *const one     = get_mode_one(mode);
 468         tarval  *      tv_next = get_tarval_null(mode);
 469
 470         declaration_t *declaration = type->declaration->next;
 471         for (; declaration != NULL; declaration = declaration->next) {
 472                 if (declaration->storage_class != STORAGE_CLASS_ENUM_ENTRY)
 473                         break;
 474
 475                 declaration->declaration_type = DECLARATION_TYPE_ENUM_ENTRY;
 476
 477                 expression_t *const init = declaration->init.enum_value;
 478                 if (init != NULL) {
 479                         ir_node *const cnst = expression_to_firm(init);
 480                         if (!is_Const(cnst)) {
 481                                 panic("couldn't fold constant");
 482                         }
 483                         tv_next = get_Const_tarval(cnst);
 484                 }
 485                 declaration->v.enum_val = tv_next;
 486                 tv_next = tarval_add(tv_next, one);
 487         }
 488
 489         return ir_type_int;
 490 }
 491
 492 static ir_type *get_ir_type(type_t *type)
 493 {
 494         assert(type != NULL);
 495
 496         type = skip_typeref(type);
 497
 498         if(type->firm_type != NULL) {
 499                 assert(type->firm_type != INVALID_TYPE);
 500                 return type->firm_type;
 501         }
 502
 503         ir_type *firm_type = NULL;
 504         switch(type->type) {
 505         case TYPE_ATOMIC:
 506                 firm_type = create_atomic_type((atomic_type_t*) type);
 507                 break;
 508         case TYPE_FUNCTION:
 509                 firm_type = create_method_type((function_type_t*) type);
 510                 break;
 511         case TYPE_POINTER:
 512                 firm_type = create_pointer_type((pointer_type_t*) type);
 513                 break;
 514         case TYPE_ARRAY:
 515                 firm_type = create_array_type((array_type_t*) type);
 516                 break;
 517         case TYPE_COMPOUND_STRUCT:
 518                 firm_type = create_struct_type((compound_type_t*) type);
 519                 break;
 520         case TYPE_COMPOUND_UNION:
 521                 firm_type = create_union_type((compound_type_t*) type);
 522                 break;
 523         case TYPE_ENUM:
 524                 firm_type = create_enum_type((enum_type_t*) type);
 525                 break;
 526         case TYPE_BUILTIN:
 527         case TYPE_TYPEOF:
 528         case TYPE_TYPEDEF:
 529         case TYPE_INVALID:
 530                 break;
 531         }
 532         if(firm_type == NULL)
 533                 panic("unknown type found");
 534
 535         type->firm_type = firm_type;
 536         return firm_type;
 537 }
 538
 539 static inline ir_mode *get_ir_mode(type_t *type)
 540 {
 541         ir_type *irtype = get_ir_type(type);
 542
 543         /* firm doesn't report a mode for arrays somehow... */
 544         if(is_Array_type(irtype)) {
 545                 return mode_P;
 546         }
 547
 548         ir_mode *mode = get_type_mode(irtype);
 549         assert(mode != NULL);
 550         return mode;
 551 }
 552
 553 static ir_entity* get_function_entity(declaration_t *declaration)
 554 {
 555         if(declaration->declaration_type == DECLARATION_TYPE_FUNCTION)
 556                 return declaration->v.entity;
 557         assert(declaration->declaration_type == DECLARATION_TYPE_UNKNOWN);
 558
 559         symbol_t *symbol = declaration->symbol;
 560         ident    *id     = new_id_from_str(symbol->string);
 561
 562         ir_type  *global_type    = get_glob_type();
 563         ir_type  *ir_type_method = get_ir_type(declaration->type);
 564         assert(is_Method_type(ir_type_method));
 565
 566         ir_entity *entity = new_entity(global_type, id, ir_type_method);
 567         set_entity_ld_ident(entity, id);
 568         if(declaration->storage_class == STORAGE_CLASS_STATIC
 569                         || declaration->is_inline) {
 570                 set_entity_visibility(entity, visibility_local);
 571         } else if(declaration->init.statement != NULL) {
 572                 set_entity_visibility(entity, visibility_external_visible);
 573         } else {
 574                 set_entity_visibility(entity, visibility_external_allocated);
 575         }
 576
 577         declaration->declaration_type = DECLARATION_TYPE_FUNCTION;
 578         declaration->v.entity         = entity;
 579
 580         return entity;
 581 }
 582
 583 static dbg_info *get_dbg_info(const source_position_t *pos)
 584 {
 585         return (dbg_info*) pos;
 586 }
 587
 588 static ir_node *const_to_firm(const const_t *cnst)
 589 {
 590         dbg_info *dbgi = get_dbg_info(&cnst->expression.source_position);
 591         ir_mode  *mode = get_ir_mode(cnst->expression.datatype);
 592
 593         char    buf[128];
 594         tarval *tv;
 595         size_t  len;
 596         if(mode_is_float(mode)) {
 597                 tv = new_tarval_from_double(cnst->v.float_value, mode);
 598         } else {
 599                 if(mode_is_signed(mode)) {
 600                         len = snprintf(buf, sizeof(buf), "%lld", cnst->v.int_value);
 601                 } else {
 602                         len = snprintf(buf, sizeof(buf), "%llu", cnst->v.int_value);
 603                 }
 604                 tv = new_tarval_from_str(buf, len, mode);
 605         }
 606
 607         return new_d_Const(dbgi, mode, tv);
 608 }
 609
 610 static ir_node *create_symconst(dbg_info *dbgi, ir_entity *entity)
 611 {
 612         assert(entity != NULL);
 613         union symconst_symbol sym;
 614         sym.entity_p = entity;
 615         return new_d_SymConst(dbgi, sym, symconst_addr_ent);
 616 }
 617
 618 static ir_node *string_to_firm(const source_position_t *const src_pos,
 619                                const char *const id_prefix,
 620                                const char *const string)
 621 {
 622         ir_type *const global_type = get_glob_type();
 623         ir_type *const type        = new_type_array(unique_ident("strtype"), 1,
 624                                                     ir_type_const_char);
 625
 626         ident     *const id     = unique_ident(id_prefix);
 627         ir_entity *const entity = new_entity(global_type, id, type);
 628         set_entity_ld_ident(entity, id);
 629         set_entity_variability(entity, variability_constant);
 630
 631         ir_type *const elem_type = ir_type_const_char;
 632         ir_mode *const mode      = get_type_mode(elem_type);
 633
 634         const size_t slen = strlen(string) + 1;
 635
 636         set_array_lower_bound_int(type, 0, 0);
 637         set_array_upper_bound_int(type, 0, slen);
 638         set_type_size_bytes(type, slen);
 639         set_type_state(type, layout_fixed);
 640
 641         tarval **const tvs = xmalloc(slen * sizeof(tvs[0]));
 642         for(size_t i = 0; i < slen; ++i) {
 643                 tvs[i] = new_tarval_from_long(string[i], mode);
 644         }
 645
 646         set_array_entity_values(entity, tvs, slen);
 647         free(tvs);
 648
 649         dbg_info *const dbgi = get_dbg_info(src_pos);
 650
 651         return create_symconst(dbgi, entity);
 652 }
 653
 654 static ir_node *string_literal_to_firm(const string_literal_t* literal)
 655 {
 656         return string_to_firm(&literal->expression.source_position, "Lstr",
 657                               literal->value);
 658 }
 659
 660 static ir_node *deref_address(ir_type *const irtype, ir_node *const addr,
 661                               dbg_info *const dbgi)
 662 {
 663         if(is_compound_type(irtype) || is_Array_type(irtype)) {
 664                 return addr;
 665         }
 666
 667         ir_mode *const mode     = get_type_mode(irtype);
 668         ir_node *const memory   = get_store();
 669         ir_node *const load     = new_d_Load(dbgi, memory, addr, mode);
 670         ir_node *const load_mem = new_d_Proj(dbgi, load, mode_M, pn_Load_M);
 671         ir_node *const load_res = new_d_Proj(dbgi, load, mode,   pn_Load_res);
 672         set_store(load_mem);
 673         return load_res;
 674 }
 675
 676 static ir_node *reference_expression_to_firm(const reference_expression_t *ref)
 677 {
 678         dbg_info      *dbgi        = get_dbg_info(&ref->expression.source_position);
 679         declaration_t *declaration = ref->declaration;
 680         type_t        *type        = skip_typeref(declaration->type);
 681
 682         switch((declaration_type_t) declaration->declaration_type) {
 683         case DECLARATION_TYPE_UNKNOWN:
 684                 if (declaration->storage_class != STORAGE_CLASS_ENUM_ENTRY) {
 685                         break;
 686                 }
 687                 get_ir_type(type);
 688                 /* FALLTHROUGH */
 689
 690         case DECLARATION_TYPE_ENUM_ENTRY: {
 691                 ir_mode *const mode = get_ir_mode(type);
 692                 return new_Const(mode, declaration->v.enum_val);
 693         }
 694
 695         case DECLARATION_TYPE_LOCAL_VARIABLE: {
 696                 ir_mode *mode = get_ir_mode(type);
 697                 return get_value(declaration->v.value_number, mode);
 698         }
 699         case DECLARATION_TYPE_FUNCTION: {
 700                 return create_symconst(dbgi, declaration->v.entity);
 701         }
 702         case DECLARATION_TYPE_GLOBAL_VARIABLE: {
 703                 ir_entity *entity   = declaration->v.entity;
 704                 ir_node   *symconst = create_symconst(dbgi, entity);
 705                 ir_type   *irtype   = get_entity_type(entity);
 706                 return deref_address(irtype, symconst, dbgi);
 707         }
 708         case DECLARATION_TYPE_LOCAL_VARIABLE_ENTITY: {
 709                 ir_entity *entity = declaration->v.entity;
 710                 ir_node   *frame  = get_irg_frame(current_ir_graph);
 711                 ir_node   *sel    = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
 712                 ir_type   *irtype = get_entity_type(entity);
 713                 return deref_address(irtype, sel, dbgi);
 714         }
 715
 716         case DECLARATION_TYPE_COMPOUND_MEMBER:
 717         case DECLARATION_TYPE_LABEL_BLOCK:
 718                 panic("not implemented reference type");
 719         }
 720
 721         panic("reference to declaration with unknown type found");
 722 }
 723
 724 static ir_node *reference_addr(const reference_expression_t *ref)
 725 {
 726         dbg_info      *dbgi        = get_dbg_info(&ref->expression.source_position);
 727         declaration_t *declaration = ref->declaration;
 728
 729         switch((declaration_type_t) declaration->declaration_type) {
 730         case DECLARATION_TYPE_UNKNOWN:
 731                 break;
 732         case DECLARATION_TYPE_LOCAL_VARIABLE:
 733                 panic("local variable without entity has no address");
 734         case DECLARATION_TYPE_FUNCTION: {
 735                 return create_symconst(dbgi, declaration->v.entity);
 736         }
 737         case DECLARATION_TYPE_GLOBAL_VARIABLE: {
 738                 ir_entity *entity   = declaration->v.entity;
 739                 ir_node   *symconst = create_symconst(dbgi, entity);
 740                 return symconst;
 741         }
 742         case DECLARATION_TYPE_LOCAL_VARIABLE_ENTITY: {
 743                 ir_entity *entity = declaration->v.entity;
 744                 ir_node   *frame  = get_irg_frame(current_ir_graph);
 745                 ir_node   *sel    = new_d_simpleSel(dbgi, new_NoMem(), frame, entity);
 746
 747                 return sel;
 748         }
 749
 750         case DECLARATION_TYPE_ENUM_ENTRY:
 751                 panic("trying to reference enum entry");
 752
 753         case DECLARATION_TYPE_COMPOUND_MEMBER:
 754         case DECLARATION_TYPE_LABEL_BLOCK:
 755                 panic("not implemented reference type");
 756         }
 757
 758         panic("reference to declaration with unknown type found");
 759 }
 760
 761 static ir_node *process_builtin_call(const call_expression_t *call)
 762 {
 763         dbg_info *dbgi = get_dbg_info(&call->expression.source_position);
 764
 765         assert(call->function->type == EXPR_BUILTIN_SYMBOL);
 766         builtin_symbol_expression_t *builtin
 767                 = (builtin_symbol_expression_t*) call->function;
 768         symbol_t *symbol = builtin->symbol;
 769
 770         if(symbol == symbol_alloca) {
 771                 if(call->arguments == NULL || call->arguments->next != NULL) {
 772                         panic("invalid number of parameters on __builtin_alloca");
 773                 }
 774                 expression_t *argument = call->arguments->expression;
 775                 ir_node      *size     = expression_to_firm(argument);
 776
 777                 ir_node *store  = get_store();
 778                 ir_node *alloca = new_d_Alloc(dbgi, store, size, firm_unknown_type,
 779                                               stack_alloc);
 780                 ir_node *proj_m = new_Proj(alloca, mode_M, pn_Alloc_M);
 781                 set_store(proj_m);
 782                 ir_node *res    = new_Proj(alloca, mode_P_data, pn_Alloc_res);
 783
 784                 return res;
 785         } else {
 786                 panic("Unsupported builtin found\n");
 787         }
 788 }
 789
 790 static ir_node *call_expression_to_firm(const call_expression_t *call)
 791 {
 792         assert(get_cur_block() != NULL);
 793
 794         expression_t  *function = call->function;
 795         if(function->type == EXPR_BUILTIN_SYMBOL) {
 796                 return process_builtin_call(call);
 797         }
 798         ir_node       *callee   = expression_to_firm(function);
 799
 800         function_type_t *function_type;
 801         if (function->datatype->type == TYPE_POINTER) {
 802                 pointer_type_t *const ptr_type = (pointer_type_t*)function->datatype;
 803                 assert(ptr_type->points_to->type == TYPE_FUNCTION);
 804                 function_type = (function_type_t*)ptr_type->points_to;
 805         } else {
 806                 assert(function->datatype->type == TYPE_FUNCTION);
 807                 function_type = (function_type_t*)function->datatype;
 808         }
 809
 810         int              n_parameters = 0;
 811         call_argument_t *argument     = call->arguments;
 812         for( ; argument != NULL; argument = argument->next) {
 813                 ++n_parameters;
 814         }
 815
 816         ir_type *ir_method_type  = get_ir_type((type_t*) function_type);
 817         ir_type *new_method_type = NULL;
 818         if(function_type->variadic || function_type->unspecified_parameters) {
 819                 /* we need to construct a new method type matching the call
 820                  * arguments... */
 821                 int n_res       = get_method_n_ress(ir_method_type);
 822                 new_method_type = new_type_method(unique_ident("calltype"),
 823                                                   n_parameters, n_res);
 824                 set_method_calling_convention(new_method_type,
 825                                get_method_calling_convention(ir_method_type));
 826                 set_method_additional_properties(new_method_type,
 827                                get_method_additional_properties(ir_method_type));
 828
 829                 for(int i = 0; i < n_res; ++i) {
 830                         set_method_res_type(new_method_type, i,
 831                                             get_method_res_type(ir_method_type, i));
 832                 }
 833         }
 834         ir_node *in[n_parameters];
 835
 836         argument = call->arguments;
 837         int n = 0;
 838         for( ; argument != NULL; argument = argument->next) {
 839                 expression_t *expression = argument->expression;
 840                 ir_node      *arg_node   = expression_to_firm(expression);
 841
 842                 in[n] = arg_node;
 843                 if(new_method_type != NULL) {
 844                         ir_type *irtype = get_ir_type(expression->datatype);
 845                         set_method_param_type(new_method_type, n, irtype);
 846                 }
 847
 848                 n++;
 849         }
 850         assert(n == n_parameters);
 851
 852         if(new_method_type != NULL)
 853                 ir_method_type = new_method_type;
 854
 855         dbg_info *dbgi  = get_dbg_info(&call->expression.source_position);
 856         ir_node  *store = get_store();
 857         ir_node  *node  = new_d_Call(dbgi, store, callee, n_parameters, in,
 858                                      ir_method_type);
 859         ir_node  *mem   = new_d_Proj(dbgi, node, mode_M, pn_Call_M_regular);
 860         set_store(mem);
 861
 862         type_t  *result_type = function_type->result_type;
 863         ir_node *result      = NULL;
 864         if(result_type != type_void) {
 865                 ir_mode *mode    = get_ir_mode(result_type);
 866                 ir_node *resproj = new_d_Proj(dbgi, node, mode_T, pn_Call_T_result);
 867                 result           = new_d_Proj(dbgi, resproj, mode, 0);
 868         }
 869
 870         return result;
 871 }
 872
 873 static void statement_to_firm(statement_t *statement);
 874 static ir_node *compound_statement_to_firm(compound_statement_t *compound);
 875
 876 static ir_node *expression_to_addr(const expression_t *expression);
 877 static void create_condition_evaluation(const expression_t *expression,
 878                                         ir_node *true_block,
 879                                         ir_node *false_block);
 880
 881 static void set_value_for_expression(const expression_t *expression,
 882                                      ir_node *value)
 883 {
 884         if(expression->type == EXPR_REFERENCE) {
 885                 reference_expression_t *ref = (reference_expression_t*) expression;
 886
 887                 declaration_t *declaration = ref->declaration;
 888                 assert(declaration->declaration_type != DECLARATION_TYPE_UNKNOWN);
 889                 if(declaration->declaration_type == DECLARATION_TYPE_LOCAL_VARIABLE) {
 890                         set_value(declaration->v.value_number, value);
 891                         return;
 892                 }
 893         }
 894
 895         dbg_info *dbgi      = get_dbg_info(&expression->source_position);
 896         ir_node  *addr      = expression_to_addr(expression);
 897         assert(get_irn_mode(value) == get_ir_mode(expression->datatype));
 898         ir_node  *memory    = get_store();
 899         ir_node  *store     = new_d_Store(dbgi, memory, addr, value);
 900         ir_node  *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
 901         set_store(store_mem);
 902 }
 903
 904 static ir_node *create_conv(dbg_info *dbgi, ir_node *value, ir_mode *dest_mode)
 905 {
 906         ir_mode *value_mode = get_irn_mode(value);
 907
 908         if (value_mode == dest_mode || is_Bad(value))
 909                 return value;
 910
 911         if(dest_mode == mode_b) {
 912                 ir_node *zero = new_Const(value_mode, get_mode_null(value_mode));
 913                 ir_node *cmp  = new_d_Cmp(dbgi, value, zero);
 914                 ir_node *proj = new_d_Proj(dbgi, cmp, mode_b, pn_Cmp_Lg);
 915                 return proj;
 916         }
 917
 918         return new_d_Conv(dbgi, value, dest_mode);
 919 }
 920
 921 static ir_node *create_incdec(const unary_expression_t *expression)
 922 {
 923         dbg_info     *dbgi  = get_dbg_info(&expression->expression.source_position);
 924         type_t       *type  = expression->expression.datatype;
 925         ir_mode      *mode  = get_ir_mode(type);
 926         expression_t *value = expression->value;
 927
 928         ir_node *value_node = expression_to_firm(value);
 929
 930         ir_node *offset;
 931         if(type->type == TYPE_POINTER) {
 932                 pointer_type_t *pointer_type = (pointer_type_t*) type;
 933                 unsigned        elem_size    = get_type_size(pointer_type->points_to);
 934                 offset = new_Const_long(mode_Is, elem_size);
 935         } else {
 936                 assert(is_type_arithmetic(type));
 937                 offset = new_Const(mode, get_mode_one(mode));
 938         }
 939
 940         switch(expression->type) {
 941         case UNEXPR_POSTFIX_INCREMENT: {
 942                 ir_node *new_value = new_d_Add(dbgi, value_node, offset, mode);
 943                 set_value_for_expression(value, new_value);
 944                 return value_node;
 945         }
 946         case UNEXPR_POSTFIX_DECREMENT: {
 947                 ir_node *new_value = new_d_Sub(dbgi, value_node, offset, mode);
 948                 set_value_for_expression(value, new_value);
 949                 return value_node;
 950         }
 951         case UNEXPR_PREFIX_INCREMENT: {
 952                 ir_node *new_value = new_d_Add(dbgi, value_node, offset, mode);
 953                 set_value_for_expression(value, new_value);
 954                 return new_value;
 955         }
 956         case UNEXPR_PREFIX_DECREMENT: {
 957                 ir_node *new_value = new_d_Sub(dbgi, value_node, offset, mode);
 958                 set_value_for_expression(value, new_value);
 959                 return new_value;
 960         }
 961         default:
 962                 panic("no incdec expr in create_incdec");
 963                 return NULL;
 964         }
 965 }
 966
 967 static ir_node *unary_expression_to_firm(const unary_expression_t *expression)
 968 {
 969         dbg_info *dbgi = get_dbg_info(&expression->expression.source_position);
 970         type_t   *type = skip_typeref(expression->expression.datatype);
 971
 972         if(expression->type == UNEXPR_TAKE_ADDRESS)
 973                 return expression_to_addr(expression->value);
 974
 975         const expression_t *value      = expression->value;
 976         ir_node            *value_node = expression_to_firm(value);
 977
 978         switch(expression->type) {
 979         case UNEXPR_NEGATE:
 980                 return new_d_Minus(dbgi, value_node, get_ir_mode(type));
 981         case UNEXPR_PLUS:
 982                 return value_node;
 983         case UNEXPR_BITWISE_NEGATE:
 984                 return new_d_Not(dbgi, value_node, get_ir_mode(type));
 985         case UNEXPR_NOT: {
 986                 if(get_irn_mode(value_node) != mode_b) {
 987                         value_node = create_conv(dbgi, value_node, mode_b);
 988                 }
 989                 value_node = new_d_Not(dbgi, value_node, mode_b);
 990                 ir_mode *const mode = get_ir_mode(type);
 991                 if(mode != mode_b) {
 992                         value_node = create_conv(dbgi, value_node, mode);
 993                 }
 994                 return value_node;
 995         }
 996         case UNEXPR_DEREFERENCE: {
 997                 ir_type *irtype = get_ir_type(type);
 998                 return deref_address(irtype, value_node, dbgi);
 999         }
1000         case UNEXPR_POSTFIX_INCREMENT:
1001         case UNEXPR_POSTFIX_DECREMENT:
1002         case UNEXPR_PREFIX_INCREMENT:
1003         case UNEXPR_PREFIX_DECREMENT:
1004                 return create_incdec(expression);
1005         case UNEXPR_CAST:
1006                 return create_conv(dbgi, value_node, get_ir_mode(type));
1007
1008         case UNEXPR_TAKE_ADDRESS:
1009         case UNEXPR_INVALID:
1010                 break;
1011         }
1012         panic("invalid UNEXPR type found");
1013 }
1014
1015 static long get_pnc(binary_expression_type_t type)
1016 {
1017         switch(type) {
1018         case BINEXPR_EQUAL:        return pn_Cmp_Eq;
1019         case BINEXPR_NOTEQUAL:     return pn_Cmp_Lg;
1020         case BINEXPR_LESS:         return pn_Cmp_Lt;
1021         case BINEXPR_LESSEQUAL:    return pn_Cmp_Le;
1022         case BINEXPR_GREATER:      return pn_Cmp_Gt;
1023         case BINEXPR_GREATEREQUAL: return pn_Cmp_Ge;
1024         default:
1025                 break;
1026         }
1027         panic("trying to get pn_Cmp from non-comparison binexpr type");
1028 }
1029
1030 static ir_node *create_lazy_op(const binary_expression_t *expression)
1031 {
1032         dbg_info *dbgi = get_dbg_info(&expression->expression.source_position);
1033         type_t   *type = expression->expression.datatype;
1034         ir_mode  *mode = get_ir_mode(type);
1035
1036         ir_node *cur_block = get_cur_block();
1037
1038         ir_node *one_block = new_immBlock();
1039         ir_node *one       = new_Const(mode, get_mode_one(mode));
1040         ir_node *jmp_one   = new_d_Jmp(dbgi);
1041
1042         ir_node *zero_block = new_immBlock();
1043         ir_node *zero       = new_Const(mode, get_mode_null(mode));
1044         ir_node *jmp_zero   = new_d_Jmp(dbgi);
1045
1046         set_cur_block(cur_block);
1047         create_condition_evaluation((const expression_t*) expression,
1048                                     one_block, zero_block);
1049         mature_immBlock(one_block);
1050         mature_immBlock(zero_block);
1051
1052         ir_node *common_block = new_immBlock();
1053         add_immBlock_pred(common_block, jmp_one);
1054         add_immBlock_pred(common_block, jmp_zero);
1055         mature_immBlock(common_block);
1056
1057         ir_node *in[2] = { one, zero };
1058         ir_node *val   = new_d_Phi(dbgi, 2, in, mode);
1059
1060         return val;
1061 }
1062
1063 typedef ir_node * (*create_arithmetic_func)(dbg_info *dbgi, ir_node *left,
1064                                             ir_node *right, ir_mode *mode);
1065
1066 static ir_node *create_arithmetic_binop(const binary_expression_t *expression,
1067                                         create_arithmetic_func func)
1068 {
1069         dbg_info *dbgi  = get_dbg_info(&expression->expression.source_position);
1070         ir_node  *left  = expression_to_firm(expression->left);
1071         ir_node  *right = expression_to_firm(expression->right);
1072         type_t   *type  = expression->right->datatype;
1073         /* be careful with the modes, because in arithmetic assign nodes only
1074          * the right operand has the mode of the arithmetic already */
1075         ir_mode  *mode  = get_ir_mode(type);
1076         left            = create_conv(dbgi, left, mode);
1077         ir_node  *res   = func(dbgi, left, right, mode);
1078
1079         return res;
1080 }
1081
1082 static ir_node *pointer_arithmetic(ir_node  *const pointer,
1083                                    ir_node  *      integer,
1084                                    type_t   *const type,
1085                                    dbg_info *const dbgi,
1086                                    const create_arithmetic_func func)
1087 {
1088         pointer_type_t *const pointer_type = (pointer_type_t*)type;
1089         type_t         *const points_to    = pointer_type->points_to;
1090         const unsigned        elem_size    = get_type_size(points_to);
1091
1092         assert(elem_size >= 1);
1093         if (elem_size > 1) {
1094                 integer             = create_conv(dbgi, integer, mode_Is);
1095                 ir_node *const cnst = new_Const_long(mode_Is, (long)elem_size);
1096                 ir_node *const mul  = new_d_Mul(dbgi, integer, cnst, mode_Is);
1097                 integer = mul;
1098         }
1099
1100         ir_mode *const mode = get_ir_mode(type);
1101         return func(dbgi, pointer, integer, mode);
1102 }
1103
1104 static ir_node *create_arithmetic_assign_binop(
1105                 const binary_expression_t *expression, create_arithmetic_func func)
1106 {
1107         dbg_info *const dbgi = get_dbg_info(&expression->expression.source_position);
1108         type_t   *const type = expression->expression.datatype;
1109         ir_node  *value;
1110
1111         if (type->type == TYPE_POINTER) {
1112                 ir_node        *const pointer = expression_to_firm(expression->left);
1113                 ir_node        *      integer = expression_to_firm(expression->right);
1114                 value = pointer_arithmetic(pointer, integer, type, dbgi, func);
1115         } else {
1116                 value = create_arithmetic_binop(expression, func);
1117         }
1118
1119         ir_mode  *const mode = get_ir_mode(type);
1120         value = create_conv(dbgi, value, mode);
1121         set_value_for_expression(expression->left, value);
1122
1123         return value;
1124 }
1125
1126 static ir_node *create_add(const binary_expression_t *expression)
1127 {
1128         dbg_info *dbgi  = get_dbg_info(&expression->expression.source_position);
1129         ir_node  *left  = expression_to_firm(expression->left);
1130         ir_node  *right = expression_to_firm(expression->right);
1131         type_t   *type  = expression->expression.datatype;
1132
1133         expression_t *expr_left  = expression->left;
1134         expression_t *expr_right = expression->right;
1135         type_t       *type_left  = skip_typeref(expr_left->datatype);
1136         type_t       *type_right = skip_typeref(expr_right->datatype);
1137
1138         if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
1139                 ir_mode *const mode = get_ir_mode(type);
1140                 return new_d_Add(dbgi, left, right, mode);
1141         }
1142
1143         if (type_left->type == TYPE_POINTER || type_left->type == TYPE_ARRAY) {
1144                 return pointer_arithmetic(left, right, type, dbgi, new_d_Add);
1145         } else {
1146                 assert(type_right->type == TYPE_POINTER || type_right->type == TYPE_ARRAY);
1147                 return pointer_arithmetic(right, left, type, dbgi, new_d_Add);
1148         }
1149 }
1150
1151 static ir_node *create_sub(const binary_expression_t *expression)
1152 {
1153         dbg_info *const dbgi  = get_dbg_info(&expression->expression.source_position);
1154         expression_t *const expr_left  = expression->left;
1155         expression_t *const expr_right = expression->right;
1156         ir_node      *const left       = expression_to_firm(expr_left);
1157         ir_node      *const right      = expression_to_firm(expr_right);
1158         type_t       *const type       = expression->expression.datatype;
1159         type_t       *const type_left  = skip_typeref(expr_left->datatype);
1160         type_t       *const type_right = skip_typeref(expr_right->datatype);
1161
1162         if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
1163                 ir_mode *const mode = get_ir_mode(type);
1164                 return new_d_Sub(dbgi, left, right, mode);
1165         } else if (type_left->type == TYPE_POINTER && type_right->type == TYPE_POINTER) {
1166                 const pointer_type_t *const ptr_type = (const pointer_type_t*)type_left;
1167                 const unsigned elem_size             = get_type_size(ptr_type->points_to);
1168                 ir_mode *const mode   = get_ir_mode(type);
1169                 ir_node *const sub    = new_d_Sub(dbgi, left, right, mode);
1170                 ir_node *const cnst   = new_Const_long(mode_Is, (long)elem_size);
1171                 ir_node *const no_mem = new_NoMem();
1172                 ir_node *const div    = new_d_Div(dbgi, no_mem, sub, cnst, mode,
1173                                                   op_pin_state_floats);
1174                 return new_d_Proj(dbgi, div, mode, pn_Div_res);
1175         }
1176
1177         assert(type_left->type == TYPE_POINTER);
1178         return pointer_arithmetic(left, right, type_left, dbgi, new_d_Sub);
1179 }
1180
1181 static ir_node *create_shift(const binary_expression_t *expression)
1182 {
1183         dbg_info *dbgi  = get_dbg_info(&expression->expression.source_position);
1184         ir_node  *left  = expression_to_firm(expression->left);
1185         ir_node  *right = expression_to_firm(expression->right);
1186         type_t   *type  = expression->expression.datatype;
1187         ir_mode  *mode  = get_ir_mode(type);
1188
1189         /* firm always wants the shift count to be unsigned */
1190         right = create_conv(dbgi, right, mode_Iu);
1191
1192         ir_node *res;
1193
1194         switch(expression->type) {
1195         case BINEXPR_SHIFTLEFT_ASSIGN:
1196         case BINEXPR_SHIFTLEFT:
1197                 res = new_d_Shl(dbgi, left, right, mode);
1198                 break;
1199         case BINEXPR_SHIFTRIGHT_ASSIGN:
1200         case BINEXPR_SHIFTRIGHT: {
1201                  expression_t *expr_left = expression->left;
1202                  type_t       *type_left = skip_typeref(expr_left->datatype);
1203
1204                  if(is_type_signed(type_left)) {
1205                         res = new_d_Shrs(dbgi, left, right, mode);
1206                  } else {
1207                          res = new_d_Shr(dbgi, left, right, mode);
1208                  }
1209                  break;
1210         }
1211         default:
1212                 panic("create shift op called for non-shift op");
1213         }
1214
1215         return res;
1216 }
1217
1218
1219 static ir_node *create_divmod(const binary_expression_t *expression)
1220 {
1221         dbg_info *dbgi  = get_dbg_info(&expression->expression.source_position);
1222         ir_node  *left  = expression_to_firm(expression->left);
1223         ir_node  *right = expression_to_firm(expression->right);
1224         ir_node  *pin   = new_Pin(new_NoMem());
1225         /* be careful with the modes, because in arithmetic assign nodes only
1226          * the right operand has the mode of the arithmetic already */
1227         type_t   *type  = expression->right->datatype;
1228         ir_mode  *mode  = get_ir_mode(type);
1229         left            = create_conv(dbgi, left, mode);
1230         ir_node  *op;
1231         ir_node  *res;
1232
1233         switch (expression->type)  {
1234                 case BINEXPR_DIV:
1235                 case BINEXPR_DIV_ASSIGN:
1236                         if(mode_is_float(mode)) {
1237                                 op  = new_d_Quot(dbgi, pin, left, right, mode, op_pin_state_floats);
1238                                 res = new_d_Proj(dbgi, op, mode, pn_Quot_res);
1239                         } else {
1240                                 op  = new_d_Div(dbgi, pin, left, right, mode, op_pin_state_floats);
1241                                 res = new_d_Proj(dbgi, op, mode, pn_Div_res);
1242                         }
1243                         break;
1244
1245                 case BINEXPR_MOD:
1246                 case BINEXPR_MOD_ASSIGN:
1247                         assert(!mode_is_float(mode));
1248                         op  = new_d_Mod(dbgi, pin, left, right, mode, op_pin_state_floats);
1249                         res = new_d_Proj(dbgi, op, mode, pn_Mod_res);
1250                         break;
1251
1252                 default: panic("unexpected binary expression type in create_divmod()");
1253         }
1254
1255         return res;
1256 }
1257
1258 static ir_node *create_arithmetic_assign_divmod(
1259                 const binary_expression_t *expression)
1260 {
1261         ir_node  *      value = create_divmod(expression);
1262         dbg_info *const dbgi  = get_dbg_info(&expression->expression.source_position);
1263         type_t   *const type  = expression->expression.datatype;
1264         ir_mode  *const mode  = get_ir_mode(type);
1265
1266         assert(type->type != TYPE_POINTER);
1267
1268         value = create_conv(dbgi, value, mode);
1269         set_value_for_expression(expression->left, value);
1270
1271         return value;
1272 }
1273
1274 static ir_node *create_arithmetic_assign_shift(
1275                 const binary_expression_t *expression)
1276 {
1277         ir_node  *      value = create_shift(expression);
1278         dbg_info *const dbgi  = get_dbg_info(&expression->expression.source_position);
1279         type_t   *const type  = expression->expression.datatype;
1280         ir_mode  *const mode  = get_ir_mode(type);
1281
1282         value = create_conv(dbgi, value, mode);
1283         set_value_for_expression(expression->left, value);
1284
1285         return value;
1286 }
1287
1288 static ir_node *binary_expression_to_firm(const binary_expression_t *expression)
1289 {
1290         binary_expression_type_t type = expression->type;
1291         switch(type) {
1292         case BINEXPR_EQUAL:
1293         case BINEXPR_NOTEQUAL:
1294         case BINEXPR_LESS:
1295         case BINEXPR_LESSEQUAL:
1296         case BINEXPR_GREATER:
1297         case BINEXPR_GREATEREQUAL: {
1298                 dbg_info *dbgi = get_dbg_info(&expression->expression.source_position);
1299                 ir_node *left  = expression_to_firm(expression->left);
1300                 ir_node *right = expression_to_firm(expression->right);
1301                 ir_node *cmp   = new_d_Cmp(dbgi, left, right);
1302                 long     pnc   = get_pnc(type);
1303                 ir_node *proj  = new_d_Proj(dbgi, cmp, mode_b, pnc);
1304                 return proj;
1305         }
1306         case BINEXPR_ASSIGN: {
1307                 ir_node *right = expression_to_firm(expression->right);
1308                 set_value_for_expression(expression->left, right);
1309                 return right;
1310         }
1311         case BINEXPR_ADD:
1312                 return create_add(expression);
1313         case BINEXPR_SUB:
1314                 return create_sub(expression);
1315         case BINEXPR_MUL:
1316                 return create_arithmetic_binop(expression, new_d_Mul);
1317         case BINEXPR_BITWISE_AND:
1318                 return create_arithmetic_binop(expression, new_d_And);
1319         case BINEXPR_BITWISE_OR:
1320                 return create_arithmetic_binop(expression, new_d_Or);
1321         case BINEXPR_BITWISE_XOR:
1322                 return create_arithmetic_binop(expression, new_d_Eor);
1323         case BINEXPR_SHIFTLEFT:
1324         case BINEXPR_SHIFTRIGHT:
1325                 return create_shift(expression);
1326         case BINEXPR_DIV:
1327         case BINEXPR_MOD:
1328                 return create_divmod(expression);
1329         case BINEXPR_LOGICAL_AND:
1330         case BINEXPR_LOGICAL_OR:
1331                 return create_lazy_op(expression);
1332         case BINEXPR_COMMA:
1333                 expression_to_firm(expression->left);
1334                 return expression_to_firm(expression->right);
1335         case BINEXPR_ADD_ASSIGN:
1336                 return create_arithmetic_assign_binop(expression, new_d_Add);
1337         case BINEXPR_SUB_ASSIGN:
1338                 return create_arithmetic_assign_binop(expression, new_d_Sub);
1339         case BINEXPR_MUL_ASSIGN:
1340                 return create_arithmetic_assign_binop(expression, new_d_Mul);
1341         case BINEXPR_DIV_ASSIGN:
1342                 return create_arithmetic_assign_divmod(expression);
1343         case BINEXPR_BITWISE_AND_ASSIGN:
1344                 return create_arithmetic_assign_binop(expression, new_d_And);
1345         case BINEXPR_BITWISE_OR_ASSIGN:
1346                 return create_arithmetic_assign_binop(expression, new_d_Or);
1347         case BINEXPR_BITWISE_XOR_ASSIGN:
1348                 return create_arithmetic_assign_binop(expression, new_d_Eor);
1349         case BINEXPR_SHIFTLEFT_ASSIGN:
1350         case BINEXPR_SHIFTRIGHT_ASSIGN:
1351                 return create_arithmetic_assign_shift(expression);
1352         default:
1353                 panic("TODO binexpr type");
1354         }
1355 }
1356
1357 static ir_node *array_access_addr(const array_access_expression_t *expression)
1358 {
1359         dbg_info *dbgi = get_dbg_info(&expression->expression.source_position);
1360         ir_node  *base_addr;
1361         ir_node  *offset;
1362
1363         type_t *type_left  = skip_typeref(expression->array_ref->datatype);
1364         type_t *type_right = skip_typeref(expression->index->datatype);
1365
1366         if(type_left->type == TYPE_POINTER || type_left->type == TYPE_ARRAY) {
1367                 base_addr = expression_to_firm(expression->array_ref);
1368                 offset    = expression_to_firm(expression->index);
1369         } else {
1370                 assert(type_right->type == TYPE_POINTER
1371                                 || type_right->type == TYPE_ARRAY);
1372                 base_addr = expression_to_firm(expression->index);
1373                 offset    = expression_to_firm(expression->array_ref);
1374         }
1375         offset = create_conv(dbgi, offset, mode_Iu);
1376
1377         unsigned elem_size       = get_type_size(expression->expression.datatype);
1378         ir_node *elem_size_const = new_Const_long(mode_Iu, elem_size);
1379         ir_node *real_offset     = new_d_Mul(dbgi, offset, elem_size_const,
1380                                              mode_Iu);
1381         ir_node *result          = new_d_Add(dbgi, base_addr, real_offset, mode_P);
1382
1383         return result;
1384 }
1385
1386 static ir_node *array_access_to_firm(
1387                 const array_access_expression_t *expression)
1388 {
1389         dbg_info *dbgi   = get_dbg_info(&expression->expression.source_position);
1390         ir_node  *addr   = array_access_addr(expression);
1391         type_t   *type   = revert_automatic_type_conversion(
1392                         (const expression_t*) expression);
1393         type             = skip_typeref(type);
1394         ir_type  *irtype = get_ir_type(type);
1395
1396         return deref_address(irtype, addr, dbgi);
1397 }
1398
1399 static ir_node *sizeof_to_firm(const sizeof_expression_t *expression)
1400 {
1401         type_t *type = expression->type;
1402         if(type == NULL) {
1403                 type = expression->size_expression->datatype;
1404                 assert(type != NULL);
1405         }
1406
1407         ir_mode  *mode      = get_ir_mode(expression->expression.datatype);
1408         unsigned  size      = get_type_size(type);
1409         ir_node  *size_node = new_Const_long(mode, size);
1410
1411         return size_node;
1412 }
1413
1414 static ir_node *conditional_to_firm(const conditional_expression_t *expression)
1415 {
1416         dbg_info *dbgi = get_dbg_info(&expression->expression.source_position);
1417
1418         ir_node *cur_block   = get_cur_block();
1419
1420         /* create the true block */
1421         ir_node *true_block  = new_immBlock();
1422
1423         ir_node *true_val = expression_to_firm(expression->true_expression);
1424         ir_node *true_jmp = new_Jmp();
1425
1426         /* create the false block */
1427         ir_node *false_block = new_immBlock();
1428
1429         ir_node *false_val = expression_to_firm(expression->false_expression);
1430         ir_node *false_jmp = new_Jmp();
1431
1432         /* create the condition evaluation */
1433         set_cur_block(cur_block);
1434         create_condition_evaluation(expression->condition, true_block, false_block);
1435         mature_immBlock(true_block);
1436         mature_immBlock(false_block);
1437
1438         /* create the common block */
1439         ir_node *common_block = new_immBlock();
1440         add_immBlock_pred(common_block, true_jmp);
1441         add_immBlock_pred(common_block, false_jmp);
1442         mature_immBlock(common_block);
1443
1444         /* TODO improve static semantics, so either both or no values are NULL */
1445         if (true_val == NULL || false_val == NULL) return NULL;
1446
1447         ir_node *in[2] = { true_val, false_val };
1448         ir_mode *mode  = get_irn_mode(true_val);
1449         assert(get_irn_mode(false_val) == mode);
1450         ir_node *val   = new_d_Phi(dbgi, 2, in, mode);
1451
1452         return val;
1453 }
1454
1455 static ir_node *select_addr(const select_expression_t *expression)
1456 {
1457         dbg_info *dbgi = get_dbg_info(&expression->expression.source_position);
1458
1459         ir_node *compound_addr = expression_to_firm(expression->compound);
1460
1461         declaration_t *entry = expression->compound_entry;
1462         assert(entry->declaration_type == DECLARATION_TYPE_COMPOUND_MEMBER);
1463         ir_entity     *entity = entry->v.entity;
1464
1465         assert(entity != NULL);
1466
1467         ir_node *sel = new_d_simpleSel(dbgi, new_NoMem(), compound_addr, entity);
1468
1469         return sel;
1470 }
1471
1472 static ir_node *select_to_firm(const select_expression_t *expression)
1473 {
1474         dbg_info *dbgi   = get_dbg_info(&expression->expression.source_position);
1475         ir_node  *addr   = select_addr(expression);
1476         type_t   *type   = revert_automatic_type_conversion(
1477                         (const expression_t*) expression);
1478         type             = skip_typeref(type);
1479         ir_type  *irtype = get_ir_type(type);
1480
1481         return deref_address(irtype, addr, dbgi);
1482 }
1483
1484 /* Values returned by __builtin_classify_type. */
1485 typedef enum gcc_type_class
1486 {
1487         no_type_class = -1,
1488         void_type_class,
1489         integer_type_class,
1490         char_type_class,
1491         enumeral_type_class,
1492         boolean_type_class,
1493         pointer_type_class,
1494         reference_type_class,
1495         offset_type_class,
1496         real_type_class,
1497         complex_type_class,
1498         function_type_class,
1499         method_type_class,
1500         record_type_class,
1501         union_type_class,
1502         array_type_class,
1503         string_type_class,
1504         set_type_class,
1505         file_type_class,
1506         lang_type_class
1507 } gcc_type_class;
1508
1509 static ir_node *classify_type_to_firm(const classify_type_expression_t *const expr)
1510 {
1511         const type_t *const type = expr->type_expression->datatype;
1512
1513         gcc_type_class tc;
1514         switch (type->type)
1515         {
1516                 case TYPE_ATOMIC: {
1517                         const atomic_type_t *const atomic_type = (const atomic_type_t*)type;
1518                         switch (atomic_type->atype) {
1519                                 // should not be reached
1520                                 case ATOMIC_TYPE_INVALID:
1521                                         tc = no_type_class;
1522                                         break;
1523
1524                                 // gcc cannot do that
1525                                 case ATOMIC_TYPE_VOID:
1526                                         tc = void_type_class;
1527                                         break;
1528
1529                                 case ATOMIC_TYPE_CHAR:      // gcc handles this as integer
1530                                 case ATOMIC_TYPE_SCHAR:     // gcc handles this as integer
1531                                 case ATOMIC_TYPE_UCHAR:     // gcc handles this as integer
1532                                 case ATOMIC_TYPE_SHORT:
1533                                 case ATOMIC_TYPE_USHORT:
1534                                 case ATOMIC_TYPE_INT:
1535                                 case ATOMIC_TYPE_UINT:
1536                                 case ATOMIC_TYPE_LONG:
1537                                 case ATOMIC_TYPE_ULONG:
1538                                 case ATOMIC_TYPE_LONGLONG:
1539                                 case ATOMIC_TYPE_ULONGLONG:
1540                                 case ATOMIC_TYPE_BOOL:      // gcc handles this as integer
1541                                         tc = integer_type_class;
1542                                         break;
1543
1544                                 case ATOMIC_TYPE_FLOAT:
1545                                 case ATOMIC_TYPE_DOUBLE:
1546                                 case ATOMIC_TYPE_LONG_DOUBLE:
1547                                         tc = real_type_class;
1548                                         break;
1549
1550 #ifdef PROVIDE_COMPLEX
1551                                 case ATOMIC_TYPE_FLOAT_COMPLEX:
1552                                 case ATOMIC_TYPE_DOUBLE_COMPLEX:
1553                                 case ATOMIC_TYPE_LONG_DOUBLE_COMPLEX:
1554                                         tc = complex_type_class;
1555                                         break;
1556                                 case ATOMIC_TYPE_FLOAT_IMAGINARY:
1557                                 case ATOMIC_TYPE_DOUBLE_IMAGINARY:
1558                                 case ATOMIC_TYPE_LONG_DOUBLE_IMAGINARY:
1559                                         tc = complex_type_class;
1560                                         break;
1561 #endif
1562
1563                                 default:
1564                                         panic("Unimplemented case in classify_type_to_firm().");
1565                         }
1566                         break;
1567                 }
1568
1569                 case TYPE_ARRAY:           // gcc handles this as pointer
1570                 case TYPE_FUNCTION:        // gcc handles this as pointer
1571                 case TYPE_POINTER:         tc = pointer_type_class; break;
1572                 case TYPE_COMPOUND_STRUCT: tc = record_type_class;  break;
1573                 case TYPE_COMPOUND_UNION:  tc = union_type_class;   break;
1574
1575                 // gcc handles this as integer
1576                 case TYPE_ENUM:            tc = integer_type_class; break;
1577
1578                 default:
1579                         panic("Unimplemented case in classify_type_to_firm().");
1580         }
1581
1582         dbg_info *const dbgi = get_dbg_info(&expr->expression.source_position);
1583         ir_mode  *const mode = mode_Is;
1584         tarval   *const tv   = new_tarval_from_long(tc, mode);
1585         return new_d_Const(dbgi, mode, tv);
1586 }
1587
1588 static ir_node *function_name_to_firm(const string_literal_t *const expr)
1589 {
1590         if (current_function_name == NULL) {
1591                 const source_position_t *const src_pos =
1592                         &expr->expression.source_position;
1593                 const char *const name = current_function_decl->symbol->string;
1594                 current_function_name = string_to_firm(src_pos, "__func__", name);
1595         }
1596
1597         return current_function_name;
1598 }
1599
1600 static ir_node *statement_expression_to_firm(const statement_expression_t *expr)
1601 {
1602         statement_t *statement = expr->statement;
1603
1604         assert(statement->type == STATEMENT_COMPOUND);
1605         return compound_statement_to_firm((compound_statement_t*) statement);
1606 }
1607
1608 static ir_node *dereference_addr(const unary_expression_t *const expression)
1609 {
1610         assert(expression->type == UNEXPR_DEREFERENCE);
1611         return expression_to_firm(expression->value);
1612 }
1613
1614 static ir_node *expression_to_addr(const expression_t *expression)
1615 {
1616         switch(expression->type) {
1617         case EXPR_REFERENCE:
1618                 return reference_addr((const reference_expression_t*) expression);
1619         case EXPR_ARRAY_ACCESS:
1620                 return array_access_addr((const array_access_expression_t*) expression);
1621         case EXPR_SELECT:
1622                 return select_addr((const select_expression_t*) expression);
1623         case EXPR_UNARY: {
1624                 const unary_expression_t *const unary_expr =
1625                         (const unary_expression_t*)expression;
1626                 if (unary_expr->type == UNEXPR_DEREFERENCE) {
1627                         return dereference_addr(unary_expr);
1628                 }
1629                 break;
1630         }
1631         default:
1632                 break;
1633         }
1634         panic("trying to get address of non-lvalue");
1635 }
1636
1637 static ir_node *_expression_to_firm(const expression_t *expression)
1638 {
1639         switch(expression->type) {
1640         case EXPR_CONST:
1641                 return const_to_firm((const const_t*) expression);
1642         case EXPR_STRING_LITERAL:
1643                 return string_literal_to_firm((const string_literal_t*) expression);
1644         case EXPR_REFERENCE:
1645                 return reference_expression_to_firm(
1646                                 (const reference_expression_t*) expression);
1647         case EXPR_CALL:
1648                 return call_expression_to_firm((const call_expression_t*) expression);
1649         case EXPR_UNARY:
1650                 return unary_expression_to_firm((const unary_expression_t*) expression);
1651         case EXPR_BINARY:
1652                 return binary_expression_to_firm(
1653                                 (const binary_expression_t*) expression);
1654         case EXPR_ARRAY_ACCESS:
1655                 return array_access_to_firm(
1656                                 (const array_access_expression_t*) expression);
1657         case EXPR_SIZEOF:
1658                 return sizeof_to_firm((const sizeof_expression_t*) expression);
1659         case EXPR_CONDITIONAL:
1660                 return conditional_to_firm((const conditional_expression_t*)expression);
1661         case EXPR_SELECT:
1662                 return select_to_firm((const select_expression_t*) expression);
1663         case EXPR_CLASSIFY_TYPE:
1664                 return classify_type_to_firm((const classify_type_expression_t*)expression);
1665         case EXPR_FUNCTION:
1666         case EXPR_PRETTY_FUNCTION:
1667                 return function_name_to_firm((const string_literal_t*)expression);
1668         case EXPR_STATEMENT:
1669                 return statement_expression_to_firm(
1670                                 (const statement_expression_t*) expression);
1671         case EXPR_OFFSETOF:
1672         case EXPR_VA_ARG:
1673         case EXPR_BUILTIN_SYMBOL:
1674                 panic("unimplemented expression found");
1675
1676         case EXPR_UNKNOWN:
1677         case EXPR_INVALID:
1678                 break;
1679         }
1680         panic("invalid expression found");
1681 }
1682
1683 static ir_node *expression_to_firm(const expression_t *expression)
1684 {
1685         ir_node *res = _expression_to_firm(expression);
1686
1687         if(res != NULL && get_irn_mode(res) == mode_b) {
1688                 ir_mode *mode = get_ir_mode(expression->datatype);
1689                 res           = create_conv(NULL, res, mode);
1690         }
1691
1692         return res;
1693 }
1694
1695 static ir_node *expression_to_modeb(const expression_t *expression)
1696 {
1697         ir_node *res = _expression_to_firm(expression);
1698         res          = create_conv(NULL, res, mode_b);
1699
1700         return res;
1701 }
1702
1703 /**
1704  * create a short-circuit expression evaluation that tries to construct
1705  * efficient control flow structures for &&, || and ! expressions
1706  */
1707 static void create_condition_evaluation(const expression_t *expression,
1708                                         ir_node *true_block,
1709                                         ir_node *false_block)
1710 {
1711         switch(expression->type) {
1712         case EXPR_UNARY: {
1713                 unary_expression_t *unary_expression = (unary_expression_t*) expression;
1714                 if(unary_expression->type == UNEXPR_NOT) {
1715                         create_condition_evaluation(unary_expression->value, false_block,
1716                                                     true_block);
1717                         return;
1718                 }
1719                 break;
1720         }
1721         case EXPR_BINARY: {
1722                 binary_expression_t *binary_expression
1723                         = (binary_expression_t*) expression;
1724                 if(binary_expression->type == BINEXPR_LOGICAL_AND) {
1725                         ir_node *cur_block   = get_cur_block();
1726                         ir_node *extra_block = new_immBlock();
1727                         set_cur_block(cur_block);
1728                         create_condition_evaluation(binary_expression->left, extra_block,
1729                                                     false_block);
1730                         mature_immBlock(extra_block);
1731                         set_cur_block(extra_block);
1732                         create_condition_evaluation(binary_expression->right, true_block,
1733                                                     false_block);
1734                         return;
1735                 }
1736                 if(binary_expression->type == BINEXPR_LOGICAL_OR) {
1737                         ir_node *cur_block   = get_cur_block();
1738                         ir_node *extra_block = new_immBlock();
1739                         set_cur_block(cur_block);
1740                         create_condition_evaluation(binary_expression->left, true_block,
1741                                                     extra_block);
1742                         mature_immBlock(extra_block);
1743                         set_cur_block(extra_block);
1744                         create_condition_evaluation(binary_expression->right, true_block,
1745                                                     false_block);
1746                         return;
1747                 }
1748                 break;
1749         }
1750         default:
1751                 break;
1752         }
1753
1754         dbg_info *dbgi       = get_dbg_info(&expression->source_position);
1755         ir_node  *condition  = expression_to_modeb(expression);
1756         ir_node  *cond       = new_d_Cond(dbgi, condition);
1757         ir_node  *true_proj  = new_d_Proj(dbgi, cond, mode_X, pn_Cond_true);
1758         ir_node  *false_proj = new_d_Proj(dbgi, cond, mode_X, pn_Cond_false);
1759
1760         add_immBlock_pred(true_block, true_proj);
1761         add_immBlock_pred(false_block, false_proj);
1762
1763         set_cur_block(NULL);
1764 }
1765
1766
1767 static void return_statement_to_firm(return_statement_t *statement)
1768 {
1769         if(get_cur_block() == NULL)
1770                 return;
1771
1772
1773         ir_type *func_irtype = get_ir_type(current_function_decl->type);
1774
1775         ir_node *value = NULL;
1776         if(statement->return_value != NULL) {
1777                 value = expression_to_firm(statement->return_value);
1778         }
1779
1780         ir_node *in[1];
1781         int      in_len;
1782         if(get_method_n_ress(func_irtype) > 0) {
1783                 if(value == NULL) {
1784                         ir_type *res_type = get_method_res_type(func_irtype, 0);
1785                         ir_mode *mode     = get_type_mode(res_type);
1786                         value             = new_Unknown(mode);
1787                 }
1788
1789                 in[0]  = value;
1790                 in_len = 1;
1791         } else {
1792                 in_len = 0;
1793         }
1794
1795         dbg_info *dbgi  = get_dbg_info(&statement->statement.source_position);
1796         ir_node  *store = get_store();
1797         ir_node  *ret   = new_d_Return(dbgi, store, in_len, in);
1798
1799         ir_node *end_block = get_irg_end_block(current_ir_graph);
1800         add_immBlock_pred(end_block, ret);
1801
1802         set_cur_block(NULL);
1803 }
1804
1805 static ir_node *expression_statement_to_firm(expression_statement_t *statement)
1806 {
1807         if(get_cur_block() == NULL)
1808                 return NULL;
1809
1810         return expression_to_firm(statement->expression);
1811 }
1812
1813 static ir_node *compound_statement_to_firm(compound_statement_t *compound)
1814 {
1815         ir_node     *result    = NULL;
1816         statement_t *statement = compound->statements;
1817         for( ; statement != NULL; statement = statement->next) {
1818                 //context2firm(&statement->context);
1819
1820                 if(statement->next == NULL && statement->type == STATEMENT_EXPRESSION) {
1821                         result = expression_statement_to_firm(
1822                                         (expression_statement_t*) statement);
1823                         break;
1824                 }
1825                 statement_to_firm(statement);
1826         }
1827
1828         return result;
1829 }
1830
1831 static void if_statement_to_firm(if_statement_t *statement)
1832 {
1833         ir_node *cur_block = get_cur_block();
1834
1835         ir_node *fallthrough_block = new_immBlock();
1836
1837         /* the true (blocks) */
1838         ir_node *true_block;
1839         if (statement->true_statement != NULL) {
1840                 true_block = new_immBlock();
1841                 statement_to_firm(statement->true_statement);
1842                 if(get_cur_block() != NULL) {
1843                         ir_node *jmp = new_Jmp();
1844                         add_immBlock_pred(fallthrough_block, jmp);
1845                 }
1846         } else {
1847                 true_block = fallthrough_block;
1848         }
1849
1850         /* the false (blocks) */
1851         ir_node *false_block;
1852         if(statement->false_statement != NULL) {
1853                 false_block = new_immBlock();
1854
1855                 statement_to_firm(statement->false_statement);
1856                 if(get_cur_block() != NULL) {
1857                         ir_node *jmp = new_Jmp();
1858                         add_immBlock_pred(fallthrough_block, jmp);
1859                 }
1860         } else {
1861                 false_block = fallthrough_block;
1862         }
1863
1864         /* create the condition */
1865         if(cur_block != NULL) {
1866                 set_cur_block(cur_block);
1867                 create_condition_evaluation(statement->condition, true_block,
1868                                             false_block);
1869         }
1870
1871         mature_immBlock(true_block);
1872         if(false_block != fallthrough_block) {
1873                 mature_immBlock(false_block);
1874         }
1875         mature_immBlock(fallthrough_block);
1876
1877         set_cur_block(fallthrough_block);
1878 }
1879
1880 static void while_statement_to_firm(while_statement_t *statement)
1881 {
1882         ir_node *jmp = NULL;
1883         if(get_cur_block() != NULL) {
1884                 jmp = new_Jmp();
1885         }
1886
1887         /* create the header block */
1888         ir_node *header_block = new_immBlock();
1889         if(jmp != NULL) {
1890                 add_immBlock_pred(header_block, jmp);
1891         }
1892
1893         /* the false block */
1894         ir_node *false_block = new_immBlock();
1895
1896         /* the loop body */
1897         ir_node *body_block;
1898         if (statement->body != NULL) {
1899                 ir_node *old_continue_label = continue_label;
1900                 ir_node *old_break_label    = break_label;
1901                 continue_label              = header_block;
1902                 break_label                 = false_block;
1903
1904                 body_block = new_immBlock();
1905                 statement_to_firm(statement->body);
1906
1907                 assert(continue_label == header_block);
1908                 assert(break_label    == false_block);
1909                 continue_label = old_continue_label;
1910                 break_label    = old_break_label;
1911
1912                 if(get_cur_block() != NULL) {
1913                         ir_node *jmp = new_Jmp();
1914                         add_immBlock_pred(header_block, jmp);
1915                 }
1916         } else {
1917                 body_block = header_block;
1918         }
1919
1920         /* create the condition */
1921         set_cur_block(header_block);
1922
1923         create_condition_evaluation(statement->condition, body_block, false_block);
1924         mature_immBlock(body_block);
1925         mature_immBlock(false_block);
1926         mature_immBlock(header_block);
1927
1928         set_cur_block(false_block);
1929 }
1930
1931 static void do_while_statement_to_firm(do_while_statement_t *statement)
1932 {
1933         ir_node *jmp = NULL;
1934         if(get_cur_block() != NULL) {
1935                 jmp = new_Jmp();
1936         }
1937
1938         /* create the header block */
1939         ir_node *header_block = new_immBlock();
1940
1941         /* the false block */
1942         ir_node *false_block = new_immBlock();
1943
1944         /* the loop body */
1945         ir_node *body_block = new_immBlock();
1946         if(jmp != NULL) {
1947                 add_immBlock_pred(body_block, jmp);
1948         }
1949
1950         if (statement->body != NULL) {
1951                 ir_node *old_continue_label = continue_label;
1952                 ir_node *old_break_label    = break_label;
1953                 continue_label              = header_block;
1954                 break_label                 = false_block;
1955
1956                 statement_to_firm(statement->body);
1957
1958                 assert(continue_label == header_block);
1959                 assert(break_label    == false_block);
1960                 continue_label = old_continue_label;
1961                 break_label    = old_break_label;
1962
1963                 if (get_cur_block() == NULL) {
1964                         mature_immBlock(header_block);
1965                         mature_immBlock(body_block);
1966                         mature_immBlock(false_block);
1967                         return;
1968                 }
1969         }
1970
1971         ir_node *body_jmp = new_Jmp();
1972         add_immBlock_pred(header_block, body_jmp);
1973         mature_immBlock(header_block);
1974
1975         /* create the condition */
1976         set_cur_block(header_block);
1977
1978         create_condition_evaluation(statement->condition, body_block, false_block);
1979         mature_immBlock(body_block);
1980         mature_immBlock(false_block);
1981         mature_immBlock(header_block);
1982
1983         set_cur_block(false_block);
1984 }
1985
1986 static void for_statement_to_firm(for_statement_t *statement)
1987 {
1988         ir_node *jmp = NULL;
1989         if (get_cur_block() != NULL) {
1990                 if(statement->initialisation != NULL) {
1991                         expression_to_firm(statement->initialisation);
1992                 }
1993                 jmp = new_Jmp();
1994         }
1995
1996         /* create the step block */
1997         ir_node *const step_block = new_immBlock();
1998         if (statement->step != NULL) {
1999                 expression_to_firm(statement->step);
2000         }
2001         ir_node *const step_jmp = new_Jmp();
2002
2003         /* create the header block */
2004         ir_node *const header_block = new_immBlock();
2005         if (jmp != NULL) {
2006                 add_immBlock_pred(header_block, jmp);
2007         }
2008         add_immBlock_pred(header_block, step_jmp);
2009
2010         /* the false block */
2011         ir_node *const false_block = new_immBlock();
2012
2013         /* the loop body */
2014         ir_node * body_block;
2015         if (statement->body != NULL) {
2016                 ir_node *const old_continue_label = continue_label;
2017                 ir_node *const old_break_label    = break_label;
2018                 continue_label = step_block;
2019                 break_label    = false_block;
2020
2021                 body_block = new_immBlock();
2022                 statement_to_firm(statement->body);
2023
2024                 assert(continue_label == step_block);
2025                 assert(break_label    == false_block);
2026                 continue_label = old_continue_label;
2027                 break_label    = old_break_label;
2028
2029                 if (get_cur_block() != NULL) {
2030                         ir_node *const jmp = new_Jmp();
2031                         add_immBlock_pred(step_block, jmp);
2032                 }
2033         } else {
2034                 body_block = step_block;
2035         }
2036
2037         /* create the condition */
2038         set_cur_block(header_block);
2039         if (statement->condition != NULL) {
2040                 create_condition_evaluation(statement->condition, body_block,
2041                                             false_block);
2042         } else {
2043                 keep_alive(header_block);
2044                 ir_node *jmp = new_Jmp();
2045                 add_immBlock_pred(body_block, jmp);
2046         }
2047
2048         mature_immBlock(body_block);
2049         mature_immBlock(false_block);
2050         mature_immBlock(step_block);
2051         mature_immBlock(header_block);
2052         mature_immBlock(false_block);
2053
2054         set_cur_block(false_block);
2055 }
2056
2057 static void create_declaration_entity(declaration_t *declaration,
2058                                       declaration_type_t declaration_type,
2059                                       ir_type *parent_type)
2060 {
2061         ident     *id     = new_id_from_str(declaration->symbol->string);
2062         ir_type   *irtype = get_ir_type(declaration->type);
2063         ir_entity *entity = new_entity(parent_type, id, irtype);
2064         set_entity_ld_ident(entity, id);
2065
2066         declaration->declaration_type = declaration_type;
2067         declaration->v.entity         = entity;
2068         set_entity_variability(entity, variability_uninitialized);
2069         /* TODO: visibility? */
2070 }
2071
2072 typedef struct compound_graph_path_entry_t compound_graph_path_entry_t;
2073
2074 enum compound_graph_entry_type_t {
2075         COMPOUND_GRAPH_ENTRY_ARRAY,
2076         COMPOUND_GRAPH_ENTRY_COMPOUND
2077 };
2078
2079 struct compound_graph_path_entry_t {
2080         int type;
2081         union {
2082                 ir_entity *entity;
2083                 int        array_index;
2084         } v;
2085         compound_graph_path_entry_t *prev;
2086 };
2087
2088 static void create_initializer_object(initializer_t *initializer, type_t *type,
2089                 ir_entity *entity, compound_graph_path_entry_t *entry, int len);
2090
2091 static compound_graph_path *create_compound_path(ir_type *type,
2092                 compound_graph_path_entry_t *entry, int len)
2093 {
2094         compound_graph_path *path = new_compound_graph_path(type, len);
2095
2096         int i = len - 1;
2097         for( ; entry != NULL; entry = entry->prev, --i) {
2098                 assert(i >= 0);
2099                 if(entry->type == COMPOUND_GRAPH_ENTRY_COMPOUND) {
2100                         set_compound_graph_path_node(path, i, entry->v.entity);
2101                 } else {
2102                         assert(entry->type == COMPOUND_GRAPH_ENTRY_ARRAY);
2103                         set_compound_graph_path_array_index(path, i, entry->v.array_index);
2104                 }
2105         }
2106         assert(i == -1);
2107
2108         return path;
2109 }
2110
2111 static void create_initializer_value(initializer_value_t *initializer,
2112                                      ir_entity *entity,
2113                                      compound_graph_path_entry_t *entry,
2114                                      int len)
2115 {
2116         ir_node             *node = expression_to_firm(initializer->value);
2117         ir_type             *type = get_entity_type(entity);
2118         compound_graph_path *path = create_compound_path(type, entry, len);
2119         add_compound_ent_value_w_path(entity, node, path);
2120 }
2121
2122 static void create_initializer_compound(initializer_list_t *initializer,
2123                                         compound_type_t *type,
2124                                         ir_entity *entity,
2125                                         compound_graph_path_entry_t *last_entry,
2126                                         int len)
2127 {
2128         declaration_t *compound_declaration = type->declaration;
2129
2130         declaration_t *compound_entry = compound_declaration->context.declarations;
2131
2132         compound_graph_path_entry_t entry;
2133         entry.type = COMPOUND_GRAPH_ENTRY_COMPOUND;
2134         entry.prev = last_entry;
2135         ++len;
2136
2137         size_t i = 0;
2138         for( ; compound_entry != NULL; compound_entry = compound_entry->next) {
2139                 if(compound_entry->symbol == NULL)
2140                         continue;
2141                 if(compound_entry->namespc != NAMESPACE_NORMAL)
2142                         continue;
2143
2144                 if(i >= initializer->len)
2145                         break;
2146
2147                 entry.v.entity = compound_entry->v.entity;
2148
2149                 initializer_t *sub_initializer = initializer->initializers[i];
2150
2151                 assert(compound_entry != NULL);
2152                 assert(compound_entry->declaration_type
2153                                 == DECLARATION_TYPE_COMPOUND_MEMBER);
2154
2155                 if(sub_initializer->type == INITIALIZER_VALUE) {
2156                         create_initializer_value(&sub_initializer->value,
2157                                                  entity, &entry, len);
2158                 } else {
2159                         type_t *type = skip_typeref(compound_entry->type);
2160                         create_initializer_object(sub_initializer, type, entity, &entry,
2161                                                   len);
2162                 }
2163
2164                 ++i;
2165         }
2166 }
2167
2168 static void create_initializer_array(initializer_list_t *initializer,
2169                                      array_type_t *type, ir_entity *entity,
2170                                      compound_graph_path_entry_t *last_entry,
2171                                      int len)
2172 {
2173         type_t *element_type = type->element_type;
2174         element_type         = skip_typeref(element_type);
2175
2176         compound_graph_path_entry_t entry;
2177         entry.type = COMPOUND_GRAPH_ENTRY_ARRAY;
2178         entry.prev = last_entry;
2179         ++len;
2180
2181         size_t i;
2182         for(i = 0; i < initializer->len; ++i) {
2183                 entry.v.array_index = i;
2184
2185                 initializer_t *sub_initializer = initializer->initializers[i];
2186
2187                 if(sub_initializer->type == INITIALIZER_VALUE) {
2188                         create_initializer_value(&sub_initializer->value,
2189                                                  entity, &entry, len);
2190                 } else {
2191                         create_initializer_object(sub_initializer, element_type, entity,
2192                                                   &entry, len);
2193                 }
2194         }
2195
2196 #if 0
2197         /* TODO: initializer rest... */
2198         if(type->size_expression != NULL) {
2199                 size_t array_len = fold_constant(type->size_expression);
2200                 for( ; i < array_len; ++i) {
2201
2202                 }
2203         }
2204 #endif
2205 }
2206
2207 static void create_initializer_string(initializer_string_t *initializer,
2208                                       array_type_t *type, ir_entity *entity,
2209                                       compound_graph_path_entry_t *last_entry,
2210                                       int len)
2211 {
2212         type_t *element_type = type->element_type;
2213         element_type         = skip_typeref(element_type);
2214
2215         compound_graph_path_entry_t entry;
2216         entry.type = COMPOUND_GRAPH_ENTRY_ARRAY;
2217         entry.prev = last_entry;
2218         ++len;
2219
2220         ir_type    *irtype  = get_entity_type(entity);
2221         size_t      arr_len = get_array_type_size(type);
2222         const char *p       = initializer->string;
2223         size_t      i       = 0;
2224         for(i = 0; i < arr_len; ++i, ++p) {
2225                 entry.v.array_index = i;
2226
2227                 ir_node             *node = new_Const_long(mode_Bs, *p);
2228                 compound_graph_path *path = create_compound_path(irtype, &entry, len);
2229                 add_compound_ent_value_w_path(entity, node, path);
2230
2231                 if(*p == '\0')
2232                         break;
2233         }
2234 }
2235
2236 static void create_initializer_object(initializer_t *initializer, type_t *type,
2237                 ir_entity *entity, compound_graph_path_entry_t *entry, int len)
2238 {
2239         if(type->type == TYPE_ARRAY) {
2240                 array_type_t *array_type = (array_type_t*) type;
2241
2242                 if(initializer->type == INITIALIZER_STRING) {
2243                         initializer_string_t *string = &initializer->string;
2244                         create_initializer_string(string, array_type, entity, entry, len);
2245                 } else {
2246                         assert(initializer->type == INITIALIZER_LIST);
2247                         initializer_list_t *list = &initializer->list;
2248                         create_initializer_array(list, array_type, entity, entry, len);
2249                 }
2250         } else {
2251                 assert(initializer->type == INITIALIZER_LIST);
2252                 initializer_list_t *list = &initializer->list;
2253
2254                 assert(type->type == TYPE_COMPOUND_STRUCT
2255                                 || type->type == TYPE_COMPOUND_UNION);
2256                 compound_type_t *compound_type = (compound_type_t*) type;
2257                 create_initializer_compound(list, compound_type, entity, entry, len);
2258         }
2259 }
2260
2261 static void create_initializer_local_variable_entity(declaration_t *declaration)
2262 {
2263         initializer_t *initializer = declaration->init.initializer;
2264         dbg_info      *dbgi        = get_dbg_info(&declaration->source_position);
2265         ir_entity     *entity      = declaration->v.entity;
2266         ir_node       *memory      = get_store();
2267         ir_node       *nomem       = new_NoMem();
2268         ir_node       *frame       = get_irg_frame(current_ir_graph);
2269         ir_node       *addr        = new_d_simpleSel(dbgi, nomem, frame, entity);
2270
2271         if(is_atomic_entity(entity)) {
2272                 assert(initializer->type == INITIALIZER_VALUE);
2273                 initializer_value_t *initializer_value = &initializer->value;
2274
2275                 ir_node *value     = expression_to_firm(initializer_value->value);
2276                 ir_node *store     = new_d_Store(dbgi, memory, addr, value);
2277                 ir_node *store_mem = new_d_Proj(dbgi, store, mode_M, pn_Store_M);
2278                 set_store(store_mem);
2279                 return;
2280         }
2281
2282         /* create a "template" entity which is copied to the entity on the stack */
2283         ident     *id          = unique_ident("initializer");
2284         ir_type   *irtype      = get_ir_type(declaration->type);
2285         ir_type   *global_type = get_glob_type();
2286         ir_entity *init_entity = new_entity(global_type, id, irtype);
2287         set_entity_ld_ident(init_entity, id);
2288
2289         set_entity_variability(init_entity, variability_initialized);
2290         set_entity_visibility(init_entity, visibility_local);
2291
2292         ir_graph *old_current_ir_graph = current_ir_graph;
2293         current_ir_graph = get_const_code_irg();
2294
2295         type_t *type = skip_typeref(declaration->type);
2296         create_initializer_object(initializer, type, init_entity, NULL, 0);
2297
2298         assert(current_ir_graph == get_const_code_irg());
2299         current_ir_graph = old_current_ir_graph;
2300
2301         ir_node *src_addr  = create_symconst(dbgi, init_entity);
2302         ir_node *copyb     = new_d_CopyB(dbgi, memory, addr, src_addr, irtype);
2303
2304         ir_node *copyb_mem = new_Proj(copyb, mode_M, pn_CopyB_M_regular);
2305         set_store(copyb_mem);
2306 }
2307
2308 static void create_initializer(declaration_t *declaration)
2309 {
2310         initializer_t *initializer = declaration->init.initializer;
2311         if(initializer == NULL)
2312                 return;
2313
2314         declaration_type_t declaration_type = (declaration_type_t)declaration->declaration_type;
2315         if(declaration_type == DECLARATION_TYPE_LOCAL_VARIABLE_ENTITY) {
2316                 create_initializer_local_variable_entity(declaration);
2317                 return;
2318         }
2319
2320         if(initializer->type == INITIALIZER_VALUE) {
2321                 initializer_value_t *initializer_value = &initializer->value;
2322
2323                 ir_node *value = expression_to_firm(initializer_value->value);
2324
2325                 if(declaration_type == DECLARATION_TYPE_LOCAL_VARIABLE) {
2326                         set_value(declaration->v.value_number, value);
2327                 } else {
2328                         assert(declaration_type == DECLARATION_TYPE_GLOBAL_VARIABLE);
2329
2330                         ir_entity *entity = declaration->v.entity;
2331
2332                         set_entity_variability(entity, variability_initialized);
2333                         set_atomic_ent_value(entity, value);
2334                 }
2335         } else {
2336                 declaration_type_t declaration_type = (declaration_type_t)declaration->declaration_type;
2337                 assert(declaration_type == DECLARATION_TYPE_LOCAL_VARIABLE_ENTITY
2338                                 || declaration_type == DECLARATION_TYPE_GLOBAL_VARIABLE);
2339
2340                 ir_entity *entity = declaration->v.entity;
2341                 set_entity_variability(entity, variability_initialized);
2342
2343                 type_t *type = skip_typeref(declaration->type);
2344                 create_initializer_object(initializer, type, entity, NULL, 0);
2345         }
2346 }
2347
2348 static void create_local_variable(declaration_t *declaration)
2349 {
2350         assert(declaration->declaration_type == DECLARATION_TYPE_UNKNOWN);
2351
2352         bool needs_entity = declaration->address_taken;
2353         type_t *type = skip_typeref(declaration->type);
2354
2355         if(type->type == TYPE_ARRAY
2356                         || type->type == TYPE_COMPOUND_STRUCT
2357                         || type->type == TYPE_COMPOUND_UNION) {
2358                 needs_entity = true;
2359         }
2360
2361         if(needs_entity) {
2362                 ir_type *frame_type = get_irg_frame_type(current_ir_graph);
2363                 create_declaration_entity(declaration,
2364                                           DECLARATION_TYPE_LOCAL_VARIABLE_ENTITY,
2365                                           frame_type);
2366         } else {
2367                 declaration->declaration_type = DECLARATION_TYPE_LOCAL_VARIABLE;
2368                 declaration->v.value_number   = next_value_number_function;
2369                 ++next_value_number_function;
2370         }
2371
2372         create_initializer(declaration);
2373 }
2374
2375 static void create_local_static_variable(declaration_t *declaration)
2376 {
2377         assert(declaration->declaration_type == DECLARATION_TYPE_UNKNOWN);
2378
2379         type_t    *type        = skip_typeref(declaration->type);
2380         ir_type   *global_type = get_glob_type();
2381         ident     *id          = unique_ident(declaration->symbol->string);
2382         ir_type   *irtype      = get_ir_type(type);
2383         ir_entity *entity      = new_entity(global_type, id, irtype);
2384         set_entity_ld_ident(entity, id);
2385
2386         declaration->declaration_type = DECLARATION_TYPE_GLOBAL_VARIABLE;
2387         declaration->v.entity         = entity;
2388         set_entity_variability(entity, variability_uninitialized);
2389         set_entity_visibility(entity, visibility_local);
2390
2391         ir_graph *old_current_ir_graph = current_ir_graph;
2392         current_ir_graph = get_const_code_irg();
2393
2394         create_initializer(declaration);
2395
2396         assert(current_ir_graph == get_const_code_irg());
2397         current_ir_graph = old_current_ir_graph;
2398 }
2399
2400 static void declaration_statement_to_firm(declaration_statement_t *statement)
2401 {
2402         declaration_t *declaration = statement->declarations_begin;
2403         declaration_t *end         = statement->declarations_end->next;
2404         for( ; declaration != end; declaration = declaration->next) {
2405                 type_t *type = declaration->type;
2406
2407                 switch(declaration->storage_class) {
2408                 case STORAGE_CLASS_TYPEDEF:
2409                         continue;
2410                 case STORAGE_CLASS_STATIC:
2411                         create_local_static_variable(declaration);
2412                         continue;
2413                 case STORAGE_CLASS_ENUM_ENTRY:
2414                         panic("enum entry declaration in local block found");
2415                 case STORAGE_CLASS_EXTERN:
2416                         panic("extern declaration in local block found");
2417                 case STORAGE_CLASS_NONE:
2418                 case STORAGE_CLASS_AUTO:
2419                 case STORAGE_CLASS_REGISTER:
2420                         if(type->type == TYPE_FUNCTION) {
2421                                 panic("nested functions not supported yet");
2422                         } else {
2423                                 create_local_variable(declaration);
2424                         }
2425                         continue;
2426                 }
2427                 panic("invalid storage class found");
2428         }
2429 }
2430
2431 static void create_jump_statement(const statement_t *statement,
2432                                   ir_node *target_block)
2433 {
2434         if(get_cur_block() == NULL)
2435                 return;
2436
2437         dbg_info *dbgi = get_dbg_info(&statement->source_position);
2438         ir_node  *jump = new_d_Jmp(dbgi);
2439         add_immBlock_pred(target_block, jump);
2440
2441         set_cur_block(NULL);
2442 }
2443
2444 static void switch_statement_to_firm(const switch_statement_t *statement)
2445 {
2446         dbg_info *dbgi = get_dbg_info(&statement->statement.source_position);
2447
2448         ir_node *expression  = expression_to_firm(statement->expression);
2449         ir_node *cond        = new_d_Cond(dbgi, expression);
2450         ir_node *break_block = new_immBlock();
2451
2452         set_cur_block(NULL);
2453
2454         ir_node *const old_switch_cond       = current_switch_cond;
2455         ir_node *const old_break_label       = break_label;
2456         const bool     old_saw_default_label = saw_default_label;
2457         current_switch_cond                  = cond;
2458         break_label                          = break_block;
2459
2460         statement_to_firm(statement->body);
2461
2462         if(get_cur_block() != NULL) {
2463                 ir_node *jmp = new_Jmp();
2464                 add_immBlock_pred(break_block, jmp);
2465         }
2466
2467         if (!saw_default_label) {
2468                 set_cur_block(get_nodes_block(cond));
2469                 ir_node *const proj = new_d_defaultProj(dbgi, cond,
2470                                                         MAGIC_DEFAULT_PN_NUMBER);
2471                 add_immBlock_pred(break_block, proj);
2472         }
2473
2474         assert(current_switch_cond == cond);
2475         assert(break_label         == break_block);
2476         current_switch_cond = old_switch_cond;
2477         break_label         = old_break_label;
2478         saw_default_label   = old_saw_default_label;
2479
2480         mature_immBlock(break_block);
2481         set_cur_block(break_block);
2482 }
2483
2484 static long fold_constant(const expression_t *expression)
2485 {
2486         ir_graph *old_current_ir_graph = current_ir_graph;
2487         current_ir_graph = get_const_code_irg();
2488
2489         ir_node *cnst = expression_to_firm(expression);
2490         if(!is_Const(cnst)) {
2491                 panic("couldn't fold constantl");
2492         }
2493         tarval *tv = get_Const_tarval(cnst);
2494         if(!tarval_is_long(tv)) {
2495                 panic("folded constant not an integer");
2496         }
2497
2498         long res = get_tarval_long(tv);
2499
2500         current_ir_graph = old_current_ir_graph;
2501         return res;
2502 }
2503
2504 static void case_label_to_firm(const case_label_statement_t *statement)
2505 {
2506         dbg_info *dbgi = get_dbg_info(&statement->statement.source_position);
2507
2508         ir_node *const fallthrough = (get_cur_block() == NULL ? NULL : new_Jmp());
2509
2510         /* let's create a node and hope firm constant folding creates a Const
2511          * node... */
2512         ir_node *proj;
2513         set_cur_block(get_nodes_block(current_switch_cond));
2514         if(statement->expression) {
2515                 long pn = fold_constant(statement->expression);
2516                 if(pn == MAGIC_DEFAULT_PN_NUMBER) {
2517                         /* oops someone detected our cheating... */
2518                         panic("magic default pn used");
2519                 }
2520                 proj = new_d_Proj(dbgi, current_switch_cond, mode_X, pn);
2521         } else {
2522                 saw_default_label = true;
2523                 proj = new_d_defaultProj(dbgi, current_switch_cond,
2524                                          MAGIC_DEFAULT_PN_NUMBER);
2525         }
2526
2527         ir_node *block = new_immBlock();
2528         if (fallthrough != NULL) {
2529                 add_immBlock_pred(block, fallthrough);
2530         }
2531         add_immBlock_pred(block, proj);
2532         mature_immBlock(block);
2533
2534         statement_to_firm(statement->label_statement);
2535 }
2536
2537 static ir_node *get_label_block(declaration_t *label)
2538 {
2539         assert(label->namespc == NAMESPACE_LABEL);
2540
2541         if(label->declaration_type == DECLARATION_TYPE_LABEL_BLOCK) {
2542                 return label->v.block;
2543         }
2544         assert(label->declaration_type == DECLARATION_TYPE_UNKNOWN);
2545
2546         ir_node *old_cur_block = get_cur_block();
2547         ir_node *block         = new_immBlock();
2548         set_cur_block(old_cur_block);
2549
2550         label->declaration_type = DECLARATION_TYPE_LABEL_BLOCK;
2551         label->v.block          = block;
2552
2553         ARR_APP1(ir_node *, imature_blocks, block);
2554
2555         return block;
2556 }
2557
2558 static void label_to_firm(const label_statement_t *statement)
2559 {
2560         ir_node *block = get_label_block(statement->label);
2561
2562         if(get_cur_block() != NULL) {
2563                 ir_node *jmp = new_Jmp();
2564                 add_immBlock_pred(block, jmp);
2565         }
2566
2567         set_cur_block(block);
2568         keep_alive(block);
2569
2570         statement_to_firm(statement->label_statement);
2571 }
2572
2573 static void goto_to_firm(const goto_statement_t *statement)
2574 {
2575         if(get_cur_block() == NULL)
2576                 return;
2577
2578         ir_node *block = get_label_block(statement->label);
2579         ir_node *jmp   = new_Jmp();
2580         add_immBlock_pred(block, jmp);
2581
2582         set_cur_block(NULL);
2583 }
2584
2585 static void statement_to_firm(statement_t *statement)
2586 {
2587         switch(statement->type) {
2588         case STATEMENT_COMPOUND:
2589                 compound_statement_to_firm((compound_statement_t*) statement);
2590                 return;
2591         case STATEMENT_RETURN:
2592                 return_statement_to_firm((return_statement_t*) statement);
2593                 return;
2594         case STATEMENT_EXPRESSION:
2595                 expression_statement_to_firm((expression_statement_t*) statement);
2596                 return;
2597         case STATEMENT_IF:
2598                 if_statement_to_firm((if_statement_t*) statement);
2599                 return;
2600         case STATEMENT_WHILE:
2601                 while_statement_to_firm((while_statement_t*) statement);
2602                 return;
2603         case STATEMENT_DO_WHILE:
2604                 do_while_statement_to_firm((do_while_statement_t*) statement);
2605                 return;
2606         case STATEMENT_DECLARATION:
2607                 declaration_statement_to_firm((declaration_statement_t*) statement);
2608                 return;
2609         case STATEMENT_BREAK:
2610                 create_jump_statement(statement, break_label);
2611                 return;
2612         case STATEMENT_CONTINUE:
2613                 create_jump_statement(statement, continue_label);
2614                 return;
2615         case STATEMENT_SWITCH:
2616                 switch_statement_to_firm((switch_statement_t*) statement);
2617                 return;
2618         case STATEMENT_CASE_LABEL:
2619                 case_label_to_firm((case_label_statement_t*) statement);
2620                 return;
2621         case STATEMENT_FOR:
2622                 for_statement_to_firm((for_statement_t*) statement);
2623                 return;
2624         case STATEMENT_LABEL:
2625                 label_to_firm((label_statement_t*) statement);
2626                 return;
2627         case STATEMENT_GOTO:
2628                 goto_to_firm((goto_statement_t*) statement);
2629                 return;
2630         default:
2631                 break;
2632         }
2633         panic("Statement not implemented\n");
2634 }
2635
2636 static int count_local_declarations(const declaration_t *      decl,
2637                                     const declaration_t *const end)
2638 {
2639         int count = 0;
2640         for (; decl != end; decl = decl->next) {
2641                 const type_t *type = skip_typeref(decl->type);
2642                 switch (type->type) {
2643                         case TYPE_ATOMIC:
2644                         case TYPE_ENUM:
2645                         case TYPE_POINTER:
2646                                 if (!decl->address_taken) ++count;
2647                                 break;
2648
2649                         default: break;
2650                 }
2651         }
2652         return count;
2653 }
2654
2655 static int count_decls_in_stmts(const statement_t *stmt)
2656 {
2657         int count = 0;
2658         for (; stmt != NULL; stmt = stmt->next) {
2659                 switch (stmt->type) {
2660                         case STATEMENT_DECLARATION: {
2661                                 const declaration_statement_t *const decl_stmt =
2662                                         (const declaration_statement_t*)stmt;
2663                                 count += count_local_declarations(decl_stmt->declarations_begin,
2664                                                                   decl_stmt->declarations_end->next);
2665                                 break;
2666                         }
2667
2668                         case STATEMENT_COMPOUND: {
2669                                 const compound_statement_t *const comp =
2670                                         (const compound_statement_t*)stmt;
2671                                 count += count_decls_in_stmts(comp->statements);
2672                                 break;
2673                         }
2674
2675                         case STATEMENT_IF: {
2676                                 const if_statement_t *const if_stmt = (const if_statement_t*)stmt;
2677                                 count += count_decls_in_stmts(if_stmt->true_statement);
2678                                 count += count_decls_in_stmts(if_stmt->false_statement);
2679                                 break;
2680                         }
2681
2682                         case STATEMENT_SWITCH: {
2683                                 const switch_statement_t *const switch_stmt =
2684                                         (const switch_statement_t*)stmt;
2685                                 count += count_decls_in_stmts(switch_stmt->body);
2686                                 break;
2687                         }
2688
2689                         case STATEMENT_LABEL: {
2690                                 const label_statement_t *const label_stmt =
2691                                         (const label_statement_t*)stmt;
2692                                 count += count_decls_in_stmts(label_stmt->label_statement);
2693                                 break;
2694                         }
2695
2696                         case STATEMENT_WHILE: {
2697                                 const while_statement_t *const while_stmt =
2698                                         (const while_statement_t*)stmt;
2699                                 count += count_decls_in_stmts(while_stmt->body);
2700                                 break;
2701                         }
2702
2703                         case STATEMENT_DO_WHILE: {
2704                                 const do_while_statement_t *const do_while_stmt =
2705                                         (const do_while_statement_t*)stmt;
2706                                 count += count_decls_in_stmts(do_while_stmt->body);
2707                                 break;
2708                         }
2709
2710                         case STATEMENT_FOR: {
2711                                 const for_statement_t *const for_stmt =
2712                                         (const for_statement_t*)stmt;
2713                                 /* TODO initialisation */
2714                                 count += count_decls_in_stmts(for_stmt->body);
2715                                 break;
2716                         }
2717
2718                         case STATEMENT_BREAK:
2719                         case STATEMENT_CASE_LABEL:
2720                         case STATEMENT_CONTINUE:
2721                         case STATEMENT_EXPRESSION:
2722                         case STATEMENT_GOTO:
2723                         case STATEMENT_INVALID:
2724                         case STATEMENT_RETURN:
2725                                 break;
2726                 }
2727         }
2728         return count;
2729 }
2730
2731 static int get_function_n_local_vars(declaration_t *declaration)
2732 {
2733         int count = 0;
2734
2735         /* count parameters */
2736         count += count_local_declarations(declaration->context.declarations, NULL);
2737
2738         /* count local variables declared in body */
2739         count += count_decls_in_stmts(declaration->init.statement);
2740
2741         /* TODO FIXME: Matze: I'm lazy don't want to scan all expressions
2742          * for expression statements... */
2743         count += 10;
2744
2745         return count;
2746 }
2747
2748 static void initialize_function_parameters(declaration_t *declaration)
2749 {
2750         ir_graph        *irg             = current_ir_graph;
2751         ir_node         *args            = get_irg_args(irg);
2752         ir_node         *start_block     = get_irg_start_block(irg);
2753         ir_type         *function_irtype = get_ir_type(declaration->type);
2754
2755         int            n         = 0;
2756         declaration_t *parameter = declaration->context.declarations;
2757         for( ; parameter != NULL; parameter = parameter->next, ++n) {
2758                 assert(parameter->declaration_type == DECLARATION_TYPE_UNKNOWN);
2759                 type_t *type = skip_typeref(parameter->type);
2760
2761                 bool needs_entity = parameter->address_taken;
2762                 if(type->type == TYPE_COMPOUND_STRUCT
2763                                 || type->type == TYPE_COMPOUND_UNION) {
2764                         needs_entity = true;
2765                 }
2766
2767                 if(needs_entity) {
2768                         ir_entity *entity = get_method_value_param_ent(function_irtype, n);
2769                         ident     *id     = new_id_from_str(parameter->symbol->string);
2770                         set_entity_ident(entity, id);
2771
2772                         parameter->declaration_type
2773                                 = DECLARATION_TYPE_LOCAL_VARIABLE_ENTITY;
2774                         parameter->v.entity = entity;
2775                         continue;
2776                 }
2777
2778                 ir_mode *mode = get_ir_mode(parameter->type);
2779                 long     pn   = n;
2780                 ir_node *proj = new_r_Proj(irg, start_block, args, mode, pn);
2781
2782                 parameter->declaration_type = DECLARATION_TYPE_LOCAL_VARIABLE;
2783                 parameter->v.value_number   = next_value_number_function;
2784                 ++next_value_number_function;
2785
2786                 set_value(parameter->v.value_number, proj);
2787         }
2788 }
2789
2790 static void create_function(declaration_t *declaration)
2791 {
2792         ir_entity *entity = get_function_entity(declaration);
2793
2794         if(declaration->init.statement == NULL)
2795                 return;
2796
2797         current_function_decl = declaration;
2798         current_function_name = NULL;
2799
2800         assert(imature_blocks == NULL);
2801         imature_blocks = NEW_ARR_F(ir_node*, 0);
2802
2803         int       n_local_vars = get_function_n_local_vars(declaration);
2804         ir_graph *irg          = new_ir_graph(entity, n_local_vars);
2805         ir_node  *first_block  = get_cur_block();
2806
2807         next_value_number_function = 0;
2808         initialize_function_parameters(declaration);
2809
2810         statement_to_firm(declaration->init.statement);
2811
2812         ir_node *end_block = get_irg_end_block(irg);
2813
2814         /* do we have a return statement yet? */
2815         if(get_cur_block() != NULL) {
2816                 assert(declaration->type->type == TYPE_FUNCTION);
2817                 const function_type_t* const func_type
2818                         = (const function_type_t*) declaration->type;
2819                 ir_node *ret;
2820                 if (func_type->result_type == type_void) {
2821                         ret = new_Return(get_store(), 0, NULL);
2822                 } else {
2823                         ir_mode *const mode = get_ir_mode(func_type->result_type);
2824                         ir_node *      in[1];
2825                         // §5.1.2.2.3 main implicitly returns 0
2826                         if (strcmp(declaration->symbol->string, "main") == 0) {
2827                                 in[0] = new_Const(mode, get_mode_null(mode));
2828                         } else {
2829                                 in[0] = new_Unknown(mode);
2830                         }
2831                         ret = new_Return(get_store(), 1, in);
2832                 }
2833                 add_immBlock_pred(end_block, ret);
2834         }
2835
2836         for(int i = 0; i < ARR_LEN(imature_blocks); ++i) {
2837                 mature_immBlock(imature_blocks[i]);
2838         }
2839         DEL_ARR_F(imature_blocks);
2840         imature_blocks = NULL;
2841
2842         mature_immBlock(first_block);
2843         mature_immBlock(end_block);
2844
2845         irg_finalize_cons(irg);
2846
2847         /* finalize the frame type */
2848         ir_type *frame_type = get_irg_frame_type(irg);
2849         int      n          = get_compound_n_members(frame_type);
2850         int      align_all  = 4;
2851         int      offset     = 0;
2852         for(int i = 0; i < n; ++i) {
2853                 ir_entity *entity      = get_compound_member(frame_type, i);
2854                 ir_type   *entity_type = get_entity_type(entity);
2855
2856                 int align = get_type_alignment_bytes(entity_type);
2857                 if(align > align_all)
2858                         align_all = align;
2859                 int misalign = 0;
2860                 if(align > 0) {
2861                         misalign  = offset % align;
2862                         if(misalign > 0) {
2863                                 offset += align - misalign;
2864                         }
2865                 }
2866
2867                 set_entity_offset(entity, offset);
2868                 offset += get_type_size_bytes(entity_type);
2869         }
2870         set_type_size_bytes(frame_type, offset);
2871         set_type_alignment_bytes(frame_type, align_all);
2872         set_type_state(frame_type, layout_fixed);
2873
2874         irg_vrfy(irg);
2875 }
2876
2877 static void create_global_variable(declaration_t *declaration)
2878 {
2879         ir_type   *global_type = get_glob_type();
2880         create_declaration_entity(declaration, DECLARATION_TYPE_GLOBAL_VARIABLE,
2881                                   global_type);
2882
2883         ir_entity *entity = declaration->v.entity;
2884         if(declaration->storage_class == STORAGE_CLASS_STATIC) {
2885                 set_entity_visibility(entity, visibility_local);
2886         } else if(declaration->storage_class == STORAGE_CLASS_EXTERN) {
2887                 set_entity_visibility(entity, visibility_external_allocated);
2888         } else {
2889                 set_entity_visibility(entity, visibility_external_visible);
2890         }
2891         current_ir_graph = get_const_code_irg();
2892         create_initializer(declaration);
2893 }
2894
2895 static void context_to_firm(context_t *context)
2896 {
2897         /* first pass: create declarations */
2898         declaration_t *declaration = context->declarations;
2899         for( ; declaration != NULL; declaration = declaration->next) {
2900                 if(declaration->namespc != NAMESPACE_NORMAL)
2901                         continue;
2902                 if(declaration->storage_class == STORAGE_CLASS_ENUM_ENTRY
2903                                 || declaration->storage_class == STORAGE_CLASS_TYPEDEF)
2904                         continue;
2905                 if(declaration->symbol == NULL)
2906                         continue;
2907
2908                 type_t *type = declaration->type;
2909                 if(type->type == TYPE_FUNCTION) {
2910                         get_function_entity(declaration);
2911                 } else {
2912                         create_global_variable(declaration);
2913                 }
2914         }
2915
2916         /* second pass: create code */
2917         declaration = context->declarations;
2918         for( ; declaration != NULL; declaration = declaration->next) {
2919                 if(declaration->namespc != NAMESPACE_NORMAL)
2920                         continue;
2921                 if(declaration->storage_class == STORAGE_CLASS_ENUM_ENTRY
2922                                 || declaration->storage_class == STORAGE_CLASS_TYPEDEF)
2923                         continue;
2924                 if(declaration->symbol == NULL)
2925                         continue;
2926
2927                 type_t *type = declaration->type;
2928                 if(type->type != TYPE_FUNCTION)
2929                         continue;
2930
2931                 create_function(declaration);
2932         }
2933 }
2934
2935 void translation_unit_to_firm(translation_unit_t *unit)
2936 {
2937         /* just to be sure */
2938         continue_label      = NULL;
2939         break_label         = NULL;
2940         current_switch_cond = NULL;
2941
2942         context_to_firm(& unit->context);
2943 }