nsz Git - cparser/blob - attribute.c

   1 /*
   2  * This file is part of cparser.
   3  * Copyright (C) 2012 Matthias Braun <matze@braunis.de>
   4  */
   5 #include <config.h>
   6
   7 #include <assert.h>
   8
   9 #include "adt/bitfiddle.h"
  10 #include "adt/strutil.h"
  11 #include "ast_t.h"
  12 #include "diagnostic.h"
  13 #include "warning.h"
  14 #include "attribute_t.h"
  15 #include "symbol_t.h"
  16 #include "adt/error.h"
  17 #include "entity_t.h"
  18 #include "symbol_table.h"
  19 #include "type_t.h"
  20
  21 static const char *const attribute_names[ATTRIBUTE_LAST+1] = {
  22         [ATTRIBUTE_GNU_ALIAS]                  = "alias",
  23         [ATTRIBUTE_GNU_ALIGNED]                = "aligned",
  24         [ATTRIBUTE_GNU_ALWAYS_INLINE]          = "always_inline",
  25         [ATTRIBUTE_GNU_CDECL]                  = "cdecl",
  26         [ATTRIBUTE_GNU_COMMON]                 = "common",
  27         [ATTRIBUTE_GNU_CONST]                  = "const",
  28         [ATTRIBUTE_GNU_CONSTRUCTOR]            = "constructor",
  29         [ATTRIBUTE_GNU_DEPRECATED]             = "deprecated",
  30         [ATTRIBUTE_GNU_DESTRUCTOR]             = "destructor",
  31         [ATTRIBUTE_GNU_DLLEXPORT]              = "dllexport",
  32         [ATTRIBUTE_GNU_DLLIMPORT]              = "dllimport",
  33         [ATTRIBUTE_GNU_EIGTHBIT_DATA]          = "eightbit_data",
  34         [ATTRIBUTE_GNU_EXTERNALLY_VISIBLE]     = "externally_visible",
  35         [ATTRIBUTE_GNU_FAR]                    = "far",
  36         [ATTRIBUTE_GNU_FASTCALL]               = "fastcall",
  37         [ATTRIBUTE_GNU_FLATTEN]                = "flatten",
  38         [ATTRIBUTE_GNU_FORMAT_ARG]             = "format_arg",
  39         [ATTRIBUTE_GNU_FORMAT]                 = "format",
  40         [ATTRIBUTE_GNU_FUNCTION_VECTOR]        = "function_vector",
  41         [ATTRIBUTE_GNU_GCC_STRUCT]             = "gcc_struct",
  42         [ATTRIBUTE_GNU_INTERRUPT_HANDLER]      = "interrupt_handler",
  43         [ATTRIBUTE_GNU_INTERRUPT]              = "interrupt",
  44         [ATTRIBUTE_GNU_LEAF]                   = "leaf",
  45         [ATTRIBUTE_GNU_LONGCALL]               = "longcall",
  46         [ATTRIBUTE_GNU_LONG_CALL]              = "long_call",
  47         [ATTRIBUTE_GNU_MALLOC]                 = "malloc",
  48         [ATTRIBUTE_GNU_MAY_ALIAS]              = "may_alias",
  49         [ATTRIBUTE_GNU_MODEL]                  = "model",
  50         [ATTRIBUTE_GNU_MODE]                   = "mode",
  51         [ATTRIBUTE_GNU_MS_STRUCT]              = "ms_struct",
  52         [ATTRIBUTE_GNU_NAKED]                  = "naked",
  53         [ATTRIBUTE_GNU_NEAR]                   = "near",
  54         [ATTRIBUTE_GNU_NESTING]                = "nesting",
  55         [ATTRIBUTE_GNU_NMI_HANDLER]            = "nmi_handler",
  56         [ATTRIBUTE_GNU_NOCOMMON]               = "nocommon",
  57         [ATTRIBUTE_GNU_NOINLINE]               = "noinline",
  58         [ATTRIBUTE_GNU_NO_INSTRUMENT_FUNCTION] = "no_instrument_function",
  59         [ATTRIBUTE_GNU_NONNULL]                = "nonnull",
  60         [ATTRIBUTE_GNU_NORETURN]               = "noreturn",
  61         [ATTRIBUTE_GNU_NOTHROW]                = "nothrow",
  62         [ATTRIBUTE_GNU_NOTSHARED]              = "notshared",
  63         [ATTRIBUTE_GNU_PACKED]                 = "packed",
  64         [ATTRIBUTE_GNU_PURE]                   = "pure",
  65         [ATTRIBUTE_GNU_REGPARM]                = "regparm",
  66         [ATTRIBUTE_GNU_RETURNS_TWICE]          = "returns_twice",
  67         [ATTRIBUTE_GNU_SAVEALL]                = "saveall",
  68         [ATTRIBUTE_GNU_SECTION]                = "section",
  69         [ATTRIBUTE_GNU_SENTINEL]               = "sentinel",
  70         [ATTRIBUTE_GNU_SHARED]                 = "shared",
  71         [ATTRIBUTE_GNU_SHORTCALL]              = "shortcall",
  72         [ATTRIBUTE_GNU_SHORT_CALL]             = "short_call",
  73         [ATTRIBUTE_GNU_SIGNAL]                 = "signal",
  74         [ATTRIBUTE_GNU_SP_SWITCH]              = "sp_switch",
  75         [ATTRIBUTE_GNU_SSEREGPARM]             = "sseregparm",
  76         [ATTRIBUTE_GNU_STDCALL]                = "stdcall",
  77         [ATTRIBUTE_GNU_TINY_DATA]              = "tiny_data",
  78         [ATTRIBUTE_GNU_TLS_MODEL]              = "tls_model",
  79         [ATTRIBUTE_GNU_TRANSPARENT_UNION]      = "transparent_union",
  80         [ATTRIBUTE_GNU_TRAP_EXIT]              = "trap_exit",
  81         [ATTRIBUTE_GNU_UNUSED]                 = "unused",
  82         [ATTRIBUTE_GNU_USED]                   = "used",
  83         [ATTRIBUTE_GNU_VISIBILITY]             = "visibility",
  84         [ATTRIBUTE_GNU_VOLATILE]               = "volatile",
  85         [ATTRIBUTE_GNU_WARN_UNUSED_RESULT]     = "warn_unused_result",
  86         [ATTRIBUTE_GNU_WEAKREF]                = "weakref",
  87         [ATTRIBUTE_GNU_WEAK]                   = "weak",
  88
  89         [ATTRIBUTE_MS_ALIGN]                   = "align",
  90         [ATTRIBUTE_MS_ALLOCATE]                = "allocate",
  91         [ATTRIBUTE_MS_DEPRECATED]              = "deprecated",
  92         [ATTRIBUTE_MS_DLLEXPORT]               = "dllexport",
  93         [ATTRIBUTE_MS_DLLIMPORT]               = "dllimport",
  94         [ATTRIBUTE_MS_NAKED]                   = "naked",
  95         [ATTRIBUTE_MS_NOALIAS]                 = "noalias",
  96         [ATTRIBUTE_MS_NOINLINE]                = "noinline",
  97         [ATTRIBUTE_MS_NORETURN]                = "noreturn",
  98         [ATTRIBUTE_MS_NOTHROW]                 = "nothrow",
  99         [ATTRIBUTE_MS_NOVTABLE]                = "novtable",
 100         [ATTRIBUTE_MS_PROPERTY]                = "property",
 101         [ATTRIBUTE_MS_RESTRICT]                = "restrict",
 102         [ATTRIBUTE_MS_RETURNS_TWICE]           = "returns_twice",
 103         [ATTRIBUTE_MS_SELECTANY]               = "selectany",
 104         [ATTRIBUTE_MS_THREAD]                  = "thread",
 105         [ATTRIBUTE_MS_UUID]                    = "uuid",
 106 };
 107
 108 const char *get_attribute_name(attribute_kind_t kind)
 109 {
 110         assert(kind <= ATTRIBUTE_LAST);
 111         return attribute_names[kind];
 112 }
 113
 114 type_t *handle_attribute_mode(const attribute_t *attribute, type_t *orig_type)
 115 {
 116         type_t *type = skip_typeref(orig_type);
 117
 118         /* at least: byte, word, pointer, list of machine modes
 119          * __XXX___ is interpreted as XXX */
 120
 121         /* This isn't really correct, the backend should provide a list of machine
 122          * specific modes (according to gcc philosophy that is...) */
 123         attribute_argument_t *arg = attribute->a.arguments;
 124         if (arg == NULL) {
 125                 errorf(&attribute->pos, "__attribute__((mode(X))) misses argument");
 126                 return orig_type;
 127         }
 128
 129         const char         *symbol_str = arg->v.symbol->string;
 130         bool                sign       = is_type_signed(type);
 131         atomic_type_kind_t  akind;
 132         if (streq_underscore("QI",   symbol_str) ||
 133             streq_underscore("byte", symbol_str)) {
 134                 akind = sign ? ATOMIC_TYPE_CHAR : ATOMIC_TYPE_UCHAR;
 135         } else if (streq_underscore("HI", symbol_str)) {
 136                 akind = sign ? ATOMIC_TYPE_SHORT : ATOMIC_TYPE_USHORT;
 137         } else if (streq_underscore("SI",      symbol_str)
 138                 || streq_underscore("word",    symbol_str)
 139                 || streq_underscore("pointer", symbol_str)) {
 140                 akind = sign ? ATOMIC_TYPE_INT : ATOMIC_TYPE_UINT;
 141         } else if (streq_underscore("DI", symbol_str)) {
 142                 akind = sign ? ATOMIC_TYPE_LONGLONG : ATOMIC_TYPE_ULONGLONG;
 143         } else {
 144                 warningf(WARN_OTHER, &attribute->pos, "ignoring unknown mode '%s'",
 145                          symbol_str);
 146                 return orig_type;
 147         }
 148
 149         if (type->kind == TYPE_ATOMIC || type->kind == TYPE_ENUM) {
 150                 type_t *copy       = duplicate_type(type);
 151                 copy->atomic.akind = akind;
 152                 return identify_new_type(copy);
 153         } else if (is_type_pointer(type)) {
 154                 warningf(WARN_OTHER, &attribute->pos, "__attribute__((mode)) on pointers not implemented yet (ignored)");
 155                 return type;
 156         }
 157
 158         errorf(&attribute->pos,
 159                "__attribute__((mode)) only allowed on integer, enum or pointer type");
 160         return orig_type;
 161 }
 162
 163 static void handle_attribute_aligned(const attribute_t *attribute,
 164                                      entity_t *entity)
 165 {
 166         int alignment = 32; /* TODO: fill in maximum useful alignment for
 167                                                    target machine */
 168         if (attribute->a.arguments) {
 169                 attribute_argument_t *argument = attribute->a.arguments;
 170                 alignment = fold_constant_to_int(argument->v.expression);
 171         }
 172
 173         if (!is_po2(alignment)) {
 174                 errorf(&attribute->pos, "alignment must be a power of 2 but is %d", alignment);
 175                 return;
 176         }
 177         if (alignment <= 0) {
 178                 errorf(&attribute->pos, "alignment must be bigger than 0 but is %d", alignment);
 179                 return;
 180         }
 181
 182         switch (entity->kind) {
 183         case DECLARATION_KIND_CASES:
 184                 entity->declaration.alignment = alignment;
 185         case ENTITY_TYPEDEF:
 186                 entity->typedefe.alignment = alignment;
 187                 break;
 188         case ENTITY_STRUCT:
 189         case ENTITY_UNION:
 190                 entity->compound.alignment = MAX(entity->compound.alignment, (il_alignment_t)alignment);
 191                 break;
 192
 193         default:
 194                 warningf(WARN_OTHER, &attribute->pos, "alignment attribute specification on '%N' ignored", entity);
 195                 break;
 196         }
 197 }
 198
 199 static const char *get_argument_string(const attribute_argument_t *argument)
 200 {
 201         if (argument == NULL)
 202                 return NULL;
 203         if (argument->kind != ATTRIBUTE_ARGUMENT_EXPRESSION)
 204                 return NULL;
 205         expression_t *expression = argument->v.expression;
 206         if (expression->kind != EXPR_STRING_LITERAL)
 207                 return NULL;
 208         return expression->string_literal.value.begin;
 209 }
 210
 211 static void handle_attribute_visibility(const attribute_t *attribute,
 212                                         entity_t *entity)
 213 {
 214         /* This isn't really correct, the backend should provide a list of machine
 215          * specific modes (according to gcc philosophy that is...) */
 216         attribute_argument_t *arg = attribute->a.arguments;
 217         if (arg == NULL) {
 218                 errorf(&attribute->pos,
 219                        "__attribute__((visibility(X))) misses argument");
 220                 return;
 221         }
 222         const char *string = get_argument_string(arg);
 223         if (string == NULL) {
 224                 errorf(&attribute->pos,
 225                        "__attribute__((visibility(X))) argument is not a string");
 226                 return;
 227         }
 228         elf_visibility_tag_t visibility = get_elf_visibility_from_string(string);
 229         if (visibility == ELF_VISIBILITY_ERROR) {
 230                 errorf(&attribute->pos,
 231                        "unknown visibility type '%s'", string);
 232                 return;
 233         }
 234
 235         switch (entity->kind) {
 236         case ENTITY_VARIABLE:
 237                 entity->variable.elf_visibility = visibility;
 238                 break;
 239         case ENTITY_FUNCTION:
 240                 entity->function.elf_visibility = visibility;
 241                 break;
 242
 243         default:
 244                 warningf(WARN_OTHER, &attribute->pos, "visibility attribute specification on '%N' ignored", entity);
 245                 break;
 246         }
 247 }
 248
 249 static void warn_arguments(const attribute_t *attribute)
 250 {
 251         if (attribute->a.arguments == NULL)
 252                 return;
 253
 254         position_t const *const pos  = &attribute->pos;
 255         char       const *const what = get_attribute_name(attribute->kind);
 256         warningf(WARN_OTHER, pos, "attribute '%s' needs no arguments", what);
 257 }
 258
 259 static void handle_attribute_packed_e(const attribute_t *attribute,
 260                                       entity_t *entity)
 261 {
 262 #if 0
 263         if (entity->kind != ENTITY_STRUCT) {
 264                 warningf(WARN_OTHER, &attribute->pos, "packed attribute on '%N' ignored", entity);
 265                 return;
 266         }
 267 #endif
 268
 269         warn_arguments(attribute);
 270         entity->compound.packed = true;
 271 }
 272
 273 static void handle_attribute_packed(const attribute_t *attribute, type_t *type)
 274 {
 275         if (type->kind != TYPE_COMPOUND_STRUCT) {
 276                 position_t const *const pos  = &attribute->pos;
 277                 warningf(WARN_OTHER, pos, "packed attribute on type '%T' ignored", type);
 278                 return;
 279         }
 280
 281         handle_attribute_packed_e(attribute, (entity_t*) type->compound.compound);
 282 }
 283
 284 static void handle_attribute_asm(const attribute_t *attribute,
 285                                       entity_t *entity)
 286 {
 287         attribute_argument_t *argument = attribute->a.arguments;
 288         assert (argument->kind == ATTRIBUTE_ARGUMENT_EXPRESSION);
 289         expression_t *expression = argument->v.expression;
 290         if (expression->kind != EXPR_STRING_LITERAL)
 291                 errorf(&attribute->pos, "Invalid asm attribute expression");
 292         symbol_t *sym = symbol_table_insert(expression->string_literal.value.begin);
 293         entity->function.actual_name = sym;
 294         assert(argument->next == NULL);
 295         return;
 296 }
 297
 298 static void handle_attribute_alias(const attribute_t *attribute,
 299                                   entity_t *entity)
 300 {
 301         // TODO: return if not at function_scope
 302         attribute_argument_t *arg = attribute->a.arguments;
 303         if (arg == NULL) {
 304                 errorf(&attribute->pos,
 305                        "__attribute__((alias(X))) misses argument");
 306                 return;
 307         }
 308         const char *string = get_argument_string(arg);
 309         if (string == NULL) {
 310                 errorf(&attribute->pos,
 311                        "__attribute__((alias(X))) argument is not a string");
 312                 return;
 313         }
 314         symbol_t *symbol = symbol_table_insert(string);
 315
 316         switch (entity->kind) {
 317         case ENTITY_VARIABLE:
 318                 entity->variable.alias = symbol;
 319                 break;
 320         case ENTITY_FUNCTION:
 321                 entity->function.alias = symbol;
 322                 break;
 323         default:
 324                 warningf(WARN_OTHER, &attribute->pos, "alias attribute on '%N' ignored", entity);
 325                 break;
 326         }
 327         return;
 328 }
 329
 330 void handle_entity_attributes(const attribute_t *attributes, entity_t *entity)
 331 {
 332         if (entity->kind == ENTITY_TYPEDEF) {
 333                 type_t *type = entity->typedefe.type;
 334                 type = handle_type_attributes(attributes, type);
 335                 entity->typedefe.type = type;
 336         } else if (is_declaration(entity)) {
 337                 type_t *type = entity->declaration.type;
 338                 type = handle_type_attributes(attributes, type);
 339                 entity->declaration.type = type;
 340         }
 341
 342         decl_modifiers_t modifiers = 0;
 343         const attribute_t *attribute = attributes;
 344         for ( ; attribute != NULL; attribute = attribute->next) {
 345                 switch (attribute->kind) {
 346                 case ATTRIBUTE_GNU_CONST:         modifiers |= DM_CONST; break;
 347                 case ATTRIBUTE_GNU_DEPRECATED:    modifiers |= DM_DEPRECATED; break;
 348                 case ATTRIBUTE_GNU_NOINLINE:      modifiers |= DM_NOINLINE; break;
 349                 case ATTRIBUTE_GNU_NAKED:         modifiers |= DM_NAKED; break;
 350                 case ATTRIBUTE_GNU_PURE:          modifiers |= DM_PURE; break;
 351                 case ATTRIBUTE_GNU_ALWAYS_INLINE: modifiers |= DM_FORCEINLINE; break;
 352                 case ATTRIBUTE_GNU_CONSTRUCTOR:   modifiers |= DM_CONSTRUCTOR; break;
 353                 case ATTRIBUTE_GNU_DESTRUCTOR:    modifiers |= DM_DESTRUCTOR; break;
 354                 case ATTRIBUTE_GNU_TRANSPARENT_UNION:
 355                                                                                   modifiers |= DM_TRANSPARENT_UNION;
 356                                                                                   break;
 357                 case ATTRIBUTE_GNU_USED:          modifiers |= DM_USED; break;
 358                 case ATTRIBUTE_GNU_UNUSED:        modifiers |= DM_UNUSED; break;
 359                 case ATTRIBUTE_GNU_DLLIMPORT:     modifiers |= DM_DLLIMPORT; break;
 360                 case ATTRIBUTE_GNU_DLLEXPORT:     modifiers |= DM_DLLEXPORT; break;
 361                 case ATTRIBUTE_GNU_WEAK:          modifiers |= DM_WEAK; break;
 362                 case ATTRIBUTE_GNU_LEAF:          modifiers |= DM_LEAF; break;
 363
 364                 case ATTRIBUTE_MS_DLLIMPORT:     modifiers |= DM_DLLIMPORT; break;
 365                 case ATTRIBUTE_MS_DLLEXPORT:     modifiers |= DM_DLLEXPORT; break;
 366                 case ATTRIBUTE_MS_NAKED:         modifiers |= DM_NAKED; break;
 367                 case ATTRIBUTE_MS_NOINLINE:      modifiers |= DM_NOINLINE; break;
 368                 case ATTRIBUTE_MS_THREAD:        modifiers |= DM_THREAD; break;
 369                 case ATTRIBUTE_MS_DEPRECATED:    modifiers |= DM_DEPRECATED; break;
 370                 case ATTRIBUTE_MS_RESTRICT:      modifiers |= DM_RESTRICT; break;
 371                 case ATTRIBUTE_MS_NOALIAS:       modifiers |= DM_NOALIAS; break;
 372
 373                 case ATTRIBUTE_GNU_ALIAS:
 374                         handle_attribute_alias(attribute, entity);
 375                         break;
 376
 377                 case ATTRIBUTE_GNU_PACKED:
 378                         handle_attribute_packed_e(attribute, entity);
 379                         break;
 380
 381                 case ATTRIBUTE_GNU_ASM:
 382                         handle_attribute_asm(attribute, entity);
 383                         break;
 384
 385                 case ATTRIBUTE_GNU_VISIBILITY:
 386                         handle_attribute_visibility(attribute, entity);
 387                         break;
 388
 389                 case ATTRIBUTE_MS_ALIGN:
 390                 case ATTRIBUTE_GNU_ALIGNED:
 391                         handle_attribute_aligned(attribute, entity);
 392                         break;
 393                 default: break;
 394                 }
 395         }
 396
 397         if (modifiers != 0) {
 398                 switch (entity->kind) {
 399                 case ENTITY_TYPEDEF:
 400                         entity->typedefe.modifiers |= modifiers;
 401                         break;
 402                 case ENTITY_UNION:
 403                 case ENTITY_STRUCT:
 404                         entity->compound.modifiers |= modifiers;
 405                         break;
 406                 case ENTITY_COMPOUND_MEMBER:
 407                 case ENTITY_VARIABLE:
 408                 case ENTITY_FUNCTION:
 409                         entity->declaration.modifiers |= modifiers;
 410                         break;
 411                 default:
 412                         /* TODO: warning */
 413                         break;
 414                 }
 415         }
 416 }
 417
 418 static type_t *change_calling_convention(type_t *type, cc_kind_t cconv)
 419 {
 420         if (is_typeref(type) || !is_type_function(type)) {
 421                 return type;
 422         }
 423
 424         if (type->function.calling_convention == cconv)
 425                 return type;
 426
 427         type_t* new_type = duplicate_type(type);
 428         new_type->function.calling_convention = cconv;
 429         return identify_new_type(new_type);
 430 }
 431
 432 static type_t *add_modifiers(type_t *type, decl_modifiers_t modifiers)
 433 {
 434         if (is_typeref(type) || !is_type_function(type)) {
 435                 return type;
 436         }
 437
 438         if ((type->function.modifiers & modifiers) == modifiers)
 439                 return type;
 440
 441         type_t* new_type = duplicate_type(type);
 442         new_type->function.modifiers |= modifiers;
 443         return identify_new_type(new_type);
 444 }
 445
 446 type_t *handle_type_attributes(const attribute_t *attributes, type_t *type)
 447 {
 448         const attribute_t *attribute = attributes;
 449         for ( ; attribute != NULL; attribute = attribute->next) {
 450                 switch (attribute->kind) {
 451                 case ATTRIBUTE_GNU_PACKED:
 452                         handle_attribute_packed(attribute, type);
 453                         break;
 454                 case ATTRIBUTE_GNU_CDECL:
 455                 case ATTRIBUTE_MS_CDECL:
 456                         type = change_calling_convention(type, CC_CDECL);
 457                         break;
 458                 case ATTRIBUTE_MS_STDCALL:
 459                 case ATTRIBUTE_GNU_STDCALL:
 460                         type = change_calling_convention(type, CC_STDCALL);
 461                         break;
 462                 case ATTRIBUTE_MS_FASTCALL:
 463                 case ATTRIBUTE_GNU_FASTCALL:
 464                         type = change_calling_convention(type, CC_FASTCALL);
 465                         break;
 466                 case ATTRIBUTE_MS_THISCALL:
 467                         type = change_calling_convention(type, CC_THISCALL);
 468                         break;
 469                 case ATTRIBUTE_GNU_RETURNS_TWICE:
 470                 case ATTRIBUTE_MS_RETURNS_TWICE:
 471                         type = add_modifiers(type, DM_RETURNS_TWICE);
 472                         break;
 473                 case ATTRIBUTE_GNU_NORETURN:
 474                 case ATTRIBUTE_MS_NORETURN:
 475                         type = add_modifiers(type, DM_NORETURN);
 476                         break;
 477                 case ATTRIBUTE_GNU_MALLOC:
 478                 case ATTRIBUTE_MS_ALLOCATE:
 479                         type = add_modifiers(type, DM_MALLOC);
 480                         break;
 481                 case ATTRIBUTE_GNU_NOTHROW:
 482                 case ATTRIBUTE_MS_NOTHROW:
 483                         type = add_modifiers(type, DM_NOTHROW);
 484                         break;
 485                 case ATTRIBUTE_GNU_MODE:
 486                         type = handle_attribute_mode(attribute, type);
 487                         break;
 488                 default:
 489                         break;
 490                 }
 491         }
 492
 493         return type;
 494 }
 495
 496 const char *get_deprecated_string(const attribute_t *attribute)
 497 {
 498         for ( ; attribute != NULL; attribute = attribute->next) {
 499                 if (attribute->kind != ATTRIBUTE_MS_DEPRECATED)
 500                         continue;
 501
 502                 attribute_argument_t *argument = attribute->a.arguments;
 503                 return get_argument_string(argument);
 504         }
 505         return NULL;
 506 }
 507
 508 static bool property_attribute_equal(const attribute_property_argument_t *prop1,
 509                                      const attribute_property_argument_t *prop2)
 510 {
 511         return prop1->put_symbol == prop2->put_symbol
 512                 && prop1->get_symbol == prop2->get_symbol;
 513 }
 514
 515 static bool attribute_argument_equal(const attribute_argument_t *arg1,
 516                                      const attribute_argument_t *arg2)
 517 {
 518         if (arg1->kind != arg2->kind)
 519                 return false;
 520
 521         switch (arg1->kind) {
 522         case ATTRIBUTE_ARGUMENT_SYMBOL:
 523                 return arg1->v.symbol == arg2->v.symbol;
 524         case ATTRIBUTE_ARGUMENT_EXPRESSION:
 525                 /* TODO */
 526                 return false;
 527         }
 528         panic("unknown argument type");
 529 }
 530
 531 static bool attribute_arguments_equal(const attribute_argument_t *args1,
 532                                       const attribute_argument_t *args2)
 533 {
 534         for ( ; args1 != NULL && args2 != NULL;
 535              args1 = args1->next, args2 = args2->next) {
 536                 if (!attribute_argument_equal(args1, args2))
 537                         return false;
 538         }
 539         /* both should be NULL now */
 540         return args1 == args2;
 541 }
 542
 543 bool attributes_equal(const attribute_t *attr1, const attribute_t *attr2)
 544 {
 545         if (attr1->kind != attr2->kind)
 546                 return false;
 547
 548         switch (attr1->kind) {
 549         case ATTRIBUTE_MS_PROPERTY:
 550                 return property_attribute_equal(attr1->a.property, attr2->a.property);
 551         default:
 552                 return attribute_arguments_equal(attr1->a.arguments,
 553                                                  attr2->a.arguments);
 554         }
 555 }