2 * This file is part of cparser.
3 * Copyright (C) 2007-2009 Matthias Braun <matze@braunis.de>
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version 2
8 * of the License, or (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
29 #include "type_hash.h"
30 #include "adt/error.h"
32 #include "lang_features.h"
34 #include "diagnostic.h"
36 #include "separator_t.h"
38 /** The default calling convention. */
39 cc_kind_t default_calling_convention = CC_CDECL;
41 static struct obstack type_obst;
42 static bool print_implicit_array_size = false;
44 static void intern_print_type_pre(const type_t *type);
45 static void intern_print_type_post(const type_t *type);
48 * Returns the size of a type node.
50 * @param kind the type kind
52 static size_t get_type_struct_size(type_kind_t kind)
54 static const size_t sizes[] = {
55 [TYPE_ATOMIC] = sizeof(atomic_type_t),
56 [TYPE_COMPOUND_STRUCT] = sizeof(compound_type_t),
57 [TYPE_COMPOUND_UNION] = sizeof(compound_type_t),
58 [TYPE_ENUM] = sizeof(enum_type_t),
59 [TYPE_FUNCTION] = sizeof(function_type_t),
60 [TYPE_POINTER] = sizeof(pointer_type_t),
61 [TYPE_REFERENCE] = sizeof(reference_type_t),
62 [TYPE_ARRAY] = sizeof(array_type_t),
63 [TYPE_TYPEDEF] = sizeof(typedef_type_t),
64 [TYPE_TYPEOF] = sizeof(typeof_type_t),
66 assert(lengthof(sizes) == (int)TYPE_TYPEOF + 1);
67 assert(kind <= TYPE_TYPEOF);
68 assert(sizes[kind] != 0);
72 type_t *allocate_type_zero(type_kind_t kind)
74 size_t const size = get_type_struct_size(kind);
75 type_t *const res = obstack_alloc(&type_obst, size);
77 res->base.kind = kind;
83 * Properties of atomic types.
85 atomic_type_properties_t atomic_type_properties[ATOMIC_TYPE_LAST+1] = {
86 [ATOMIC_TYPE_VOID] = {
89 .flags = ATOMIC_TYPE_FLAG_NONE,
92 [ATOMIC_TYPE_BOOL] = {
95 .flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
98 [ATOMIC_TYPE_CHAR] = {
101 .flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
104 [ATOMIC_TYPE_SCHAR] = {
107 .flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
108 | ATOMIC_TYPE_FLAG_SIGNED,
111 [ATOMIC_TYPE_UCHAR] = {
114 .flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
117 [ATOMIC_TYPE_SHORT] = {
120 .flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
121 | ATOMIC_TYPE_FLAG_SIGNED,
124 [ATOMIC_TYPE_USHORT] = {
127 .flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
130 [ATOMIC_TYPE_INT] = {
131 .size = (unsigned) -1,
132 .alignment = (unsigned) -1,
133 .flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
134 | ATOMIC_TYPE_FLAG_SIGNED,
137 [ATOMIC_TYPE_UINT] = {
138 .size = (unsigned) -1,
139 .alignment = (unsigned) -1,
140 .flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
143 [ATOMIC_TYPE_LONG] = {
144 .size = (unsigned) -1,
145 .alignment = (unsigned) -1,
146 .flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
147 | ATOMIC_TYPE_FLAG_SIGNED,
150 [ATOMIC_TYPE_ULONG] = {
151 .size = (unsigned) -1,
152 .alignment = (unsigned) -1,
153 .flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
156 [ATOMIC_TYPE_LONGLONG] = {
159 .flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC
160 | ATOMIC_TYPE_FLAG_SIGNED,
163 [ATOMIC_TYPE_ULONGLONG] = {
166 .flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
169 [ATOMIC_TYPE_FLOAT] = {
172 .flags = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
173 | ATOMIC_TYPE_FLAG_SIGNED,
176 [ATOMIC_TYPE_DOUBLE] = {
179 .flags = ATOMIC_TYPE_FLAG_FLOAT | ATOMIC_TYPE_FLAG_ARITHMETIC
180 | ATOMIC_TYPE_FLAG_SIGNED,
183 [ATOMIC_TYPE_WCHAR_T] = {
184 .size = (unsigned)-1,
185 .alignment = (unsigned)-1,
186 .flags = ATOMIC_TYPE_FLAG_INTEGER | ATOMIC_TYPE_FLAG_ARITHMETIC,
187 .rank = (unsigned)-1,
190 atomic_type_properties_t pointer_properties = {
193 .flags = ATOMIC_TYPE_FLAG_NONE,
196 static inline bool is_po2(unsigned x)
198 return (x & (x-1)) == 0;
201 void init_types(unsigned machine_size)
203 obstack_init(&type_obst);
205 atomic_type_properties_t *props = atomic_type_properties;
207 /* atempt to set some sane defaults based on machine size */
209 unsigned int_size = machine_size < 32 ? 2 : 4;
210 unsigned long_size = machine_size < 64 ? 4 : 8;
212 props[ATOMIC_TYPE_INT].size = int_size;
213 props[ATOMIC_TYPE_INT].alignment = int_size;
214 props[ATOMIC_TYPE_UINT].size = int_size;
215 props[ATOMIC_TYPE_UINT].alignment = int_size;
216 props[ATOMIC_TYPE_LONG].size = long_size;
217 props[ATOMIC_TYPE_LONG].alignment = long_size;
218 props[ATOMIC_TYPE_ULONG].size = long_size;
219 props[ATOMIC_TYPE_ULONG].alignment = long_size;
221 pointer_properties.size = long_size;
222 pointer_properties.alignment = long_size;
223 pointer_properties.struct_alignment = long_size;
225 props[ATOMIC_TYPE_LONG_DOUBLE] = props[ATOMIC_TYPE_DOUBLE];
226 props[ATOMIC_TYPE_WCHAR_T] = props[ATOMIC_TYPE_INT];
228 /* set struct alignments to the same value as alignment */
229 for (size_t i = 0; i != lengthof(atomic_type_properties); ++i) {
230 props[i].struct_alignment = props[i].alignment;
234 void exit_types(void)
236 obstack_free(&type_obst, NULL);
239 void print_type_qualifiers(type_qualifiers_t const qualifiers, QualifierSeparators const q)
241 size_t sep = q & QUAL_SEP_START ? 0 : 1;
242 if (qualifiers & TYPE_QUALIFIER_CONST) {
243 print_string(&" const"[sep]);
246 if (qualifiers & TYPE_QUALIFIER_VOLATILE) {
247 print_string(&" volatile"[sep]);
250 if (qualifiers & TYPE_QUALIFIER_RESTRICT) {
251 print_string(&" restrict"[sep]);
254 if (sep == 0 && q & QUAL_SEP_END)
258 const char *get_atomic_kind_name(atomic_type_kind_t kind)
261 case ATOMIC_TYPE_VOID: return "void";
262 case ATOMIC_TYPE_WCHAR_T: return "wchar_t";
263 case ATOMIC_TYPE_BOOL: return c_mode & _CXX ? "bool" : "_Bool";
264 case ATOMIC_TYPE_CHAR: return "char";
265 case ATOMIC_TYPE_SCHAR: return "signed char";
266 case ATOMIC_TYPE_UCHAR: return "unsigned char";
267 case ATOMIC_TYPE_INT: return "int";
268 case ATOMIC_TYPE_UINT: return "unsigned int";
269 case ATOMIC_TYPE_SHORT: return "short";
270 case ATOMIC_TYPE_USHORT: return "unsigned short";
271 case ATOMIC_TYPE_LONG: return "long";
272 case ATOMIC_TYPE_ULONG: return "unsigned long";
273 case ATOMIC_TYPE_LONGLONG: return "long long";
274 case ATOMIC_TYPE_ULONGLONG: return "unsigned long long";
275 case ATOMIC_TYPE_LONG_DOUBLE: return "long double";
276 case ATOMIC_TYPE_FLOAT: return "float";
277 case ATOMIC_TYPE_DOUBLE: return "double";
279 return "INVALIDATOMIC";
283 * Prints the name of an atomic type kinds.
285 * @param kind The type kind.
287 static void print_atomic_kinds(atomic_type_kind_t kind)
289 const char *s = get_atomic_kind_name(kind);
294 * Prints the name of an atomic type.
296 * @param type The type.
298 static void print_atomic_type(const atomic_type_t *type)
300 print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
301 print_atomic_kinds(type->akind);
305 * Prints the name of a complex type.
307 * @param type The type.
309 static void print_complex_type(const atomic_type_t *type)
311 print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
312 print_string("_Complex");
313 print_atomic_kinds(type->akind);
317 * Prints the name of an imaginary type.
319 * @param type The type.
321 static void print_imaginary_type(const atomic_type_t *type)
323 print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
324 print_string("_Imaginary ");
325 print_atomic_kinds(type->akind);
329 * Print the first part (the prefix) of a type.
331 * @param type The type to print.
333 static void print_function_type_pre(const function_type_t *type)
335 switch (type->linkage) {
338 print_string("extern \"C\" ");
342 if (!(c_mode & _CXX))
343 print_string("extern \"C++\" ");
347 print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
349 intern_print_type_pre(type->return_type);
351 cc_kind_t cc = type->calling_convention;
354 case CC_CDECL: print_string(" __cdecl"); break;
355 case CC_STDCALL: print_string(" __stdcall"); break;
356 case CC_FASTCALL: print_string(" __fastcall"); break;
357 case CC_THISCALL: print_string(" __thiscall"); break;
359 if (default_calling_convention != CC_CDECL) {
360 /* show the default calling convention if its not cdecl */
361 cc = default_calling_convention;
369 * Print the second part (the postfix) of a type.
371 * @param type The type to print.
373 static void print_function_type_post(const function_type_t *type,
374 const scope_t *parameters)
377 separator_t sep = { "", ", " };
378 if (parameters == NULL) {
379 function_parameter_t *parameter = type->parameters;
380 for( ; parameter != NULL; parameter = parameter->next) {
381 print_string(sep_next(&sep));
382 print_type(parameter->type);
385 entity_t *parameter = parameters->entities;
386 for (; parameter != NULL; parameter = parameter->base.next) {
387 if (parameter->kind != ENTITY_PARAMETER)
390 print_string(sep_next(&sep));
391 const type_t *const param_type = parameter->declaration.type;
392 if (param_type == NULL) {
393 print_string(parameter->base.symbol->string);
395 print_type_ext(param_type, parameter->base.symbol, NULL);
399 if (type->variadic) {
400 print_string(sep_next(&sep));
403 if (sep_at_first(&sep) && !type->unspecified_parameters) {
404 print_string("void");
408 intern_print_type_post(type->return_type);
412 * Prints the prefix part of a pointer type.
414 * @param type The pointer type.
416 static void print_pointer_type_pre(const pointer_type_t *type)
418 type_t const *const points_to = type->points_to;
419 intern_print_type_pre(points_to);
420 if (points_to->kind == TYPE_ARRAY || points_to->kind == TYPE_FUNCTION)
422 variable_t *const variable = type->base_variable;
423 if (variable != NULL) {
424 print_string(" __based(");
425 print_string(variable->base.base.symbol->string);
429 print_type_qualifiers(type->base.qualifiers, QUAL_SEP_START);
433 * Prints the postfix part of a pointer type.
435 * @param type The pointer type.
437 static void print_pointer_type_post(const pointer_type_t *type)
439 type_t const *const points_to = type->points_to;
440 if (points_to->kind == TYPE_ARRAY || points_to->kind == TYPE_FUNCTION)
442 intern_print_type_post(points_to);
446 * Prints the prefix part of a reference type.
448 * @param type The reference type.
450 static void print_reference_type_pre(const reference_type_t *type)
452 type_t const *const refers_to = type->refers_to;
453 intern_print_type_pre(refers_to);
454 if (refers_to->kind == TYPE_ARRAY || refers_to->kind == TYPE_FUNCTION)
460 * Prints the postfix part of a reference type.
462 * @param type The reference type.
464 static void print_reference_type_post(const reference_type_t *type)
466 type_t const *const refers_to = type->refers_to;
467 if (refers_to->kind == TYPE_ARRAY || refers_to->kind == TYPE_FUNCTION)
469 intern_print_type_post(refers_to);
473 * Prints the prefix part of an array type.
475 * @param type The array type.
477 static void print_array_type_pre(const array_type_t *type)
479 intern_print_type_pre(type->element_type);
483 * Prints the postfix part of an array type.
485 * @param type The array type.
487 static void print_array_type_post(const array_type_t *type)
490 if (type->is_static) {
491 print_string("static ");
493 print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
494 if (type->size_expression != NULL
495 && (print_implicit_array_size || !type->has_implicit_size)) {
496 print_expression(type->size_expression);
499 intern_print_type_post(type->element_type);
502 void print_enum_definition(const enum_t *enume)
508 entity_t *entry = enume->base.next;
509 for( ; entry != NULL && entry->kind == ENTITY_ENUM_VALUE;
510 entry = entry->base.next) {
513 print_string(entry->base.symbol->string);
514 if (entry->enum_value.value != NULL) {
516 print_expression(entry->enum_value.value);
527 * Prints an enum type.
529 * @param type The enum type.
531 static void print_type_enum(const enum_type_t *type)
533 print_type_qualifiers(type->base.base.qualifiers, QUAL_SEP_END);
534 print_string("enum ");
536 enum_t *enume = type->enume;
537 symbol_t *symbol = enume->base.symbol;
538 if (symbol != NULL) {
539 print_string(symbol->string);
541 print_enum_definition(enume);
545 void print_compound_definition(const compound_t *compound)
550 entity_t *entity = compound->members.entities;
551 for( ; entity != NULL; entity = entity->base.next) {
552 if (entity->kind != ENTITY_COMPOUND_MEMBER)
556 print_entity(entity);
563 if (compound->modifiers & DM_TRANSPARENT_UNION) {
564 print_string("__attribute__((__transparent_union__))");
569 * Prints a compound type.
571 * @param kind The name of the compound kind.
572 * @param type The compound type.
574 static void print_compound_type(char const *const kind, compound_type_t const *const type)
576 print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
579 compound_t *compound = type->compound;
580 symbol_t *symbol = compound->base.symbol;
581 if (symbol != NULL) {
582 print_string(symbol->string);
584 print_compound_definition(compound);
589 * Prints the prefix part of a typedef type.
591 * @param type The typedef type.
593 static void print_typedef_type_pre(const typedef_type_t *const type)
595 print_type_qualifiers(type->base.qualifiers, QUAL_SEP_END);
596 print_string(type->typedefe->base.symbol->string);
600 * Prints the prefix part of a typeof type.
602 * @param type The typeof type.
604 static void print_typeof_type_pre(const typeof_type_t *const type)
606 print_string("typeof(");
607 if (type->expression != NULL) {
608 print_expression(type->expression);
610 print_type(type->typeof_type);
616 * Prints the prefix part of a type.
618 * @param type The type.
620 static void intern_print_type_pre(const type_t *const type)
623 case TYPE_ARRAY: print_array_type_pre( &type->array); return;
624 case TYPE_ATOMIC: print_atomic_type( &type->atomic); return;
625 case TYPE_COMPLEX: print_complex_type( &type->atomic); return;
626 case TYPE_COMPOUND_STRUCT: print_compound_type("struct ", &type->compound); return;
627 case TYPE_COMPOUND_UNION: print_compound_type("union ", &type->compound); return;
628 case TYPE_ENUM: print_type_enum( &type->enumt); return;
629 case TYPE_ERROR: print_string("<error>"); return;
630 case TYPE_FUNCTION: print_function_type_pre( &type->function); return;
631 case TYPE_IMAGINARY: print_imaginary_type( &type->atomic); return;
632 case TYPE_POINTER: print_pointer_type_pre( &type->pointer); return;
633 case TYPE_REFERENCE: print_reference_type_pre( &type->reference); return;
634 case TYPE_TYPEDEF: print_typedef_type_pre( &type->typedeft); return;
635 case TYPE_TYPEOF: print_typeof_type_pre( &type->typeoft); return;
637 print_string("unknown");
641 * Prints the postfix part of a type.
643 * @param type The type.
645 static void intern_print_type_post(const type_t *const type)
649 print_function_type_post(&type->function, NULL);
652 print_pointer_type_post(&type->pointer);
655 print_reference_type_post(&type->reference);
658 print_array_type_post(&type->array);
665 case TYPE_COMPOUND_STRUCT:
666 case TYPE_COMPOUND_UNION:
673 void print_type(const type_t *const type)
675 print_type_ext(type, NULL, NULL);
678 void print_type_ext(const type_t *const type, const symbol_t *symbol,
679 const scope_t *parameters)
681 intern_print_type_pre(type);
682 if (symbol != NULL) {
684 print_string(symbol->string);
686 if (type->kind == TYPE_FUNCTION) {
687 print_function_type_post(&type->function, parameters);
689 intern_print_type_post(type);
693 type_t *duplicate_type(const type_t *type)
695 size_t size = get_type_struct_size(type->kind);
697 type_t *const copy = obstack_copy(&type_obst, type, size);
698 copy->base.firm_type = NULL;
703 type_t *get_unqualified_type(type_t *type)
705 assert(!is_typeref(type));
707 if (type->base.qualifiers == TYPE_QUALIFIER_NONE)
710 type_t *unqualified_type = duplicate_type(type);
711 unqualified_type->base.qualifiers = TYPE_QUALIFIER_NONE;
713 return identify_new_type(unqualified_type);
716 type_t *get_qualified_type(type_t *orig_type, type_qualifiers_t const qual)
718 type_t *type = skip_typeref(orig_type);
721 if (is_type_array(type)) {
722 /* For array types the element type has to be adjusted */
723 type_t *element_type = type->array.element_type;
724 type_t *qual_element_type = get_qualified_type(element_type, qual);
726 if (qual_element_type == element_type)
729 copy = duplicate_type(type);
730 copy->array.element_type = qual_element_type;
731 } else if (is_type_valid(type)) {
732 if ((type->base.qualifiers & qual) == (int)qual)
735 copy = duplicate_type(type);
736 copy->base.qualifiers |= qual;
741 return identify_new_type(copy);
744 static bool test_atomic_type_flag(atomic_type_kind_t kind,
745 atomic_type_flag_t flag)
747 assert(kind <= ATOMIC_TYPE_LAST);
748 return (atomic_type_properties[kind].flags & flag) != 0;
751 bool is_type_integer(const type_t *type)
753 assert(!is_typeref(type));
755 if (type->kind == TYPE_ENUM)
757 if (type->kind != TYPE_ATOMIC)
760 return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_INTEGER);
763 bool is_type_enum(const type_t *type)
765 assert(!is_typeref(type));
766 return type->kind == TYPE_ENUM;
769 bool is_type_float(const type_t *type)
771 assert(!is_typeref(type));
773 if (type->kind != TYPE_ATOMIC)
776 return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_FLOAT);
779 bool is_type_complex(const type_t *type)
781 assert(!is_typeref(type));
783 if (type->kind != TYPE_ATOMIC)
786 return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_COMPLEX);
789 bool is_type_signed(const type_t *type)
791 assert(!is_typeref(type));
793 /* enum types are int for now */
794 if (type->kind == TYPE_ENUM)
796 if (type->kind != TYPE_ATOMIC)
799 return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_SIGNED);
802 bool is_type_arithmetic(const type_t *type)
804 assert(!is_typeref(type));
812 return test_atomic_type_flag(type->atomic.akind, ATOMIC_TYPE_FLAG_ARITHMETIC);
818 bool is_type_real(const type_t *type)
821 return is_type_integer(type) || is_type_float(type);
824 bool is_type_scalar(const type_t *type)
826 assert(!is_typeref(type));
828 if (type->kind == TYPE_POINTER)
831 return is_type_arithmetic(type);
834 bool is_type_incomplete(const type_t *type)
836 assert(!is_typeref(type));
839 case TYPE_COMPOUND_STRUCT:
840 case TYPE_COMPOUND_UNION: {
841 const compound_type_t *compound_type = &type->compound;
842 return !compound_type->compound->complete;
848 return type->array.size_expression == NULL
849 && !type->array.size_constant;
854 return type->atomic.akind == ATOMIC_TYPE_VOID;
864 panic("typedef not skipped");
867 panic("invalid type");
870 bool is_type_object(const type_t *type)
872 return !is_type_function(type) && !is_type_incomplete(type);
876 * Check if two function types are compatible.
878 static bool function_types_compatible(const function_type_t *func1,
879 const function_type_t *func2)
881 const type_t* const ret1 = skip_typeref(func1->return_type);
882 const type_t* const ret2 = skip_typeref(func2->return_type);
883 if (!types_compatible(ret1, ret2))
886 if (func1->linkage != func2->linkage)
889 cc_kind_t cc1 = func1->calling_convention;
890 if (cc1 == CC_DEFAULT)
891 cc1 = default_calling_convention;
892 cc_kind_t cc2 = func2->calling_convention;
893 if (cc2 == CC_DEFAULT)
894 cc2 = default_calling_convention;
899 if (func1->variadic != func2->variadic)
902 /* can parameters be compared? */
903 if ((func1->unspecified_parameters && !func1->kr_style_parameters)
904 || (func2->unspecified_parameters && !func2->kr_style_parameters))
907 /* TODO: handling of unspecified parameters not correct yet */
909 /* all argument types must be compatible */
910 function_parameter_t *parameter1 = func1->parameters;
911 function_parameter_t *parameter2 = func2->parameters;
912 for ( ; parameter1 != NULL && parameter2 != NULL;
913 parameter1 = parameter1->next, parameter2 = parameter2->next) {
914 type_t *parameter1_type = skip_typeref(parameter1->type);
915 type_t *parameter2_type = skip_typeref(parameter2->type);
917 parameter1_type = get_unqualified_type(parameter1_type);
918 parameter2_type = get_unqualified_type(parameter2_type);
920 if (!types_compatible(parameter1_type, parameter2_type))
923 /* same number of arguments? */
924 if (parameter1 != NULL || parameter2 != NULL)
931 * Check if two array types are compatible.
933 static bool array_types_compatible(const array_type_t *array1,
934 const array_type_t *array2)
936 type_t *element_type1 = skip_typeref(array1->element_type);
937 type_t *element_type2 = skip_typeref(array2->element_type);
938 if (!types_compatible(element_type1, element_type2))
941 if (!array1->size_constant || !array2->size_constant)
944 return array1->size == array2->size;
947 bool types_compatible(const type_t *type1, const type_t *type2)
949 assert(!is_typeref(type1));
950 assert(!is_typeref(type2));
952 /* shortcut: the same type is always compatible */
956 if (type1->base.qualifiers == type2->base.qualifiers &&
957 type1->kind == type2->kind) {
958 switch (type1->kind) {
960 return function_types_compatible(&type1->function, &type2->function);
964 return type1->atomic.akind == type2->atomic.akind;
966 return array_types_compatible(&type1->array, &type2->array);
969 const type_t *const to1 = skip_typeref(type1->pointer.points_to);
970 const type_t *const to2 = skip_typeref(type2->pointer.points_to);
971 return types_compatible(to1, to2);
974 case TYPE_REFERENCE: {
975 const type_t *const to1 = skip_typeref(type1->reference.refers_to);
976 const type_t *const to2 = skip_typeref(type2->reference.refers_to);
977 return types_compatible(to1, to2);
980 case TYPE_COMPOUND_STRUCT:
981 case TYPE_COMPOUND_UNION:
985 /* TODO: not implemented */
989 /* Hmm, the error type should be compatible to all other types */
993 panic("typeref not skipped");
997 return !is_type_valid(type1) || !is_type_valid(type2);
1001 * Skip all typerefs and return the underlying type.
1003 type_t *skip_typeref(type_t *type)
1005 type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1008 switch (type->kind) {
1011 case TYPE_TYPEDEF: {
1012 qualifiers |= type->base.qualifiers;
1014 const typedef_type_t *typedef_type = &type->typedeft;
1015 if (typedef_type->resolved_type != NULL) {
1016 type = typedef_type->resolved_type;
1019 type = typedef_type->typedefe->type;
1023 qualifiers |= type->base.qualifiers;
1024 type = type->typeoft.typeof_type;
1032 if (qualifiers != TYPE_QUALIFIER_NONE) {
1033 type_t *const copy = duplicate_type(type);
1035 /* for const with typedefed array type the element type has to be
1037 if (is_type_array(copy)) {
1038 type_t *element_type = copy->array.element_type;
1039 element_type = duplicate_type(element_type);
1040 element_type->base.qualifiers |= qualifiers;
1041 copy->array.element_type = element_type;
1043 copy->base.qualifiers |= qualifiers;
1046 type = identify_new_type(copy);
1052 unsigned get_type_size(type_t *type)
1054 switch (type->kind) {
1058 case TYPE_IMAGINARY:
1060 return get_atomic_type_size(type->atomic.akind);
1062 return get_atomic_type_size(type->atomic.akind) * 2;
1063 case TYPE_COMPOUND_UNION:
1064 layout_union_type(&type->compound);
1065 return type->compound.compound->size;
1066 case TYPE_COMPOUND_STRUCT:
1067 layout_struct_type(&type->compound);
1068 return type->compound.compound->size;
1070 return 1; /* strange GNU extensions: sizeof(function) == 1 */
1071 case TYPE_REFERENCE:
1073 return pointer_properties.size;
1075 /* TODO: correct if element_type is aligned? */
1076 il_size_t element_size = get_type_size(type->array.element_type);
1077 return type->array.size * element_size;
1080 return get_type_size(type->typedeft.typedefe->type);
1082 return get_type_size(type->typeoft.typeof_type);
1084 panic("invalid type");
1087 unsigned get_type_alignment(type_t *type)
1089 switch (type->kind) {
1093 case TYPE_IMAGINARY:
1096 return get_atomic_type_alignment(type->atomic.akind);
1097 case TYPE_COMPOUND_UNION:
1098 layout_union_type(&type->compound);
1099 return type->compound.compound->alignment;
1100 case TYPE_COMPOUND_STRUCT:
1101 layout_struct_type(&type->compound);
1102 return type->compound.compound->alignment;
1104 /* gcc says 1 here... */
1106 case TYPE_REFERENCE:
1108 return pointer_properties.alignment;
1110 return get_type_alignment(type->array.element_type);
1111 case TYPE_TYPEDEF: {
1112 il_alignment_t alignment
1113 = get_type_alignment(type->typedeft.typedefe->type);
1114 if (type->typedeft.typedefe->alignment > alignment)
1115 alignment = type->typedeft.typedefe->alignment;
1120 return get_type_alignment(type->typeoft.typeof_type);
1122 panic("invalid type");
1126 * get alignment of a type when used inside a compound.
1127 * Some ABIs are broken and alignment inside a compound is different from
1128 * recommended alignment of a type
1130 static unsigned get_type_alignment_compound(type_t *const type)
1132 assert(!is_typeref(type));
1133 if (type->kind == TYPE_ATOMIC)
1134 return atomic_type_properties[type->atomic.akind].struct_alignment;
1135 return get_type_alignment(type);
1138 decl_modifiers_t get_type_modifiers(const type_t *type)
1140 switch(type->kind) {
1143 case TYPE_COMPOUND_STRUCT:
1144 case TYPE_COMPOUND_UNION:
1145 return type->compound.compound->modifiers;
1147 return type->function.modifiers;
1151 case TYPE_IMAGINARY:
1152 case TYPE_REFERENCE:
1156 case TYPE_TYPEDEF: {
1157 decl_modifiers_t modifiers = type->typedeft.typedefe->modifiers;
1158 modifiers |= get_type_modifiers(type->typedeft.typedefe->type);
1162 return get_type_modifiers(type->typeoft.typeof_type);
1164 panic("invalid type");
1167 type_qualifiers_t get_type_qualifier(const type_t *type, bool skip_array_type)
1169 type_qualifiers_t qualifiers = TYPE_QUALIFIER_NONE;
1172 switch (type->base.kind) {
1174 return TYPE_QUALIFIER_NONE;
1176 qualifiers |= type->base.qualifiers;
1177 const typedef_type_t *typedef_type = &type->typedeft;
1178 if (typedef_type->resolved_type != NULL)
1179 type = typedef_type->resolved_type;
1181 type = typedef_type->typedefe->type;
1184 type = type->typeoft.typeof_type;
1187 if (skip_array_type) {
1188 type = type->array.element_type;
1197 return type->base.qualifiers | qualifiers;
1200 unsigned get_atomic_type_size(atomic_type_kind_t kind)
1202 assert(kind <= ATOMIC_TYPE_LAST);
1203 return atomic_type_properties[kind].size;
1206 unsigned get_atomic_type_alignment(atomic_type_kind_t kind)
1208 assert(kind <= ATOMIC_TYPE_LAST);
1209 return atomic_type_properties[kind].alignment;
1212 unsigned get_atomic_type_flags(atomic_type_kind_t kind)
1214 assert(kind <= ATOMIC_TYPE_LAST);
1215 return atomic_type_properties[kind].flags;
1219 * Find the atomic type kind representing a given size (signed).
1221 atomic_type_kind_t find_signed_int_atomic_type_kind_for_size(unsigned size)
1223 static atomic_type_kind_t kinds[32];
1226 atomic_type_kind_t kind = kinds[size];
1227 if (kind == (atomic_type_kind_t)0) {
1228 static const atomic_type_kind_t possible_kinds[] = {
1233 ATOMIC_TYPE_LONGLONG
1235 for (size_t i = 0; i < lengthof(possible_kinds); ++i) {
1236 if (get_atomic_type_size(possible_kinds[i]) == size) {
1237 kind = possible_kinds[i];
1247 * Find the atomic type kind representing a given size (signed).
1249 atomic_type_kind_t find_unsigned_int_atomic_type_kind_for_size(unsigned size)
1251 static atomic_type_kind_t kinds[32];
1254 atomic_type_kind_t kind = kinds[size];
1255 if (kind == (atomic_type_kind_t)0) {
1256 static const atomic_type_kind_t possible_kinds[] = {
1261 ATOMIC_TYPE_ULONGLONG
1263 for (size_t i = 0; i < lengthof(possible_kinds); ++i) {
1264 if (get_atomic_type_size(possible_kinds[i]) == size) {
1265 kind = possible_kinds[i];
1275 * Hash the given type and return the "singleton" version
1278 type_t *identify_new_type(type_t *type)
1280 type_t *result = typehash_insert(type);
1281 if (result != type) {
1282 obstack_free(&type_obst, type);
1288 * Creates a new atomic type.
1290 * @param akind The kind of the atomic type.
1291 * @param qualifiers Type qualifiers for the new type.
1293 type_t *make_atomic_type(atomic_type_kind_t akind, type_qualifiers_t qualifiers)
1295 type_t *const type = allocate_type_zero(TYPE_ATOMIC);
1296 type->base.qualifiers = qualifiers;
1297 type->atomic.akind = akind;
1299 return identify_new_type(type);
1303 * Creates a new complex type.
1305 * @param akind The kind of the atomic type.
1306 * @param qualifiers Type qualifiers for the new type.
1308 type_t *make_complex_type(atomic_type_kind_t akind,
1309 type_qualifiers_t qualifiers)
1311 type_t *const type = allocate_type_zero(TYPE_COMPLEX);
1312 type->base.qualifiers = qualifiers;
1313 type->atomic.akind = akind;
1315 return identify_new_type(type);
1319 * Creates a new imaginary type.
1321 * @param akind The kind of the atomic type.
1322 * @param qualifiers Type qualifiers for the new type.
1324 type_t *make_imaginary_type(atomic_type_kind_t akind,
1325 type_qualifiers_t qualifiers)
1327 type_t *const type = allocate_type_zero(TYPE_IMAGINARY);
1328 type->base.qualifiers = qualifiers;
1329 type->atomic.akind = akind;
1331 return identify_new_type(type);
1335 * Creates a new pointer type.
1337 * @param points_to The points-to type for the new type.
1338 * @param qualifiers Type qualifiers for the new type.
1340 type_t *make_pointer_type(type_t *points_to, type_qualifiers_t qualifiers)
1342 type_t *const type = allocate_type_zero(TYPE_POINTER);
1343 type->base.qualifiers = qualifiers;
1344 type->pointer.points_to = points_to;
1345 type->pointer.base_variable = NULL;
1347 return identify_new_type(type);
1351 * Creates a new reference type.
1353 * @param refers_to The referred-to type for the new type.
1355 type_t *make_reference_type(type_t *refers_to)
1357 type_t *const type = allocate_type_zero(TYPE_REFERENCE);
1358 type->base.qualifiers = TYPE_QUALIFIER_NONE;
1359 type->reference.refers_to = refers_to;
1361 return identify_new_type(type);
1365 * Creates a new based pointer type.
1367 * @param points_to The points-to type for the new type.
1368 * @param qualifiers Type qualifiers for the new type.
1369 * @param variable The based variable
1371 type_t *make_based_pointer_type(type_t *points_to,
1372 type_qualifiers_t qualifiers, variable_t *variable)
1374 type_t *const type = allocate_type_zero(TYPE_POINTER);
1375 type->base.qualifiers = qualifiers;
1376 type->pointer.points_to = points_to;
1377 type->pointer.base_variable = variable;
1379 return identify_new_type(type);
1383 type_t *make_array_type(type_t *element_type, size_t size,
1384 type_qualifiers_t qualifiers)
1386 type_t *const type = allocate_type_zero(TYPE_ARRAY);
1387 type->base.qualifiers = qualifiers;
1388 type->array.element_type = element_type;
1389 type->array.size = size;
1390 type->array.size_constant = true;
1392 return identify_new_type(type);
1395 static entity_t *pack_bitfield_members(il_size_t *struct_offset,
1396 il_alignment_t *struct_alignment,
1397 bool packed, entity_t *first)
1399 il_size_t offset = *struct_offset;
1400 il_alignment_t alignment = *struct_alignment;
1401 size_t bit_offset = 0;
1404 for (member = first; member != NULL; member = member->base.next) {
1405 if (member->kind != ENTITY_COMPOUND_MEMBER)
1407 if (!member->compound_member.bitfield)
1410 type_t *const base_type = skip_typeref(member->declaration.type);
1411 il_alignment_t base_alignment = get_type_alignment_compound(base_type);
1412 il_alignment_t alignment_mask = base_alignment-1;
1413 if (base_alignment > alignment)
1414 alignment = base_alignment;
1416 size_t bit_size = member->compound_member.bit_size;
1418 bit_offset += (offset & alignment_mask) * BITS_PER_BYTE;
1419 offset &= ~alignment_mask;
1420 size_t base_size = get_type_size(base_type) * BITS_PER_BYTE;
1422 if (bit_offset + bit_size > base_size || bit_size == 0) {
1423 offset += (bit_offset+BITS_PER_BYTE-1) / BITS_PER_BYTE;
1424 offset = (offset + base_alignment-1) & ~alignment_mask;
1429 if (byte_order_big_endian) {
1430 size_t base_size = get_type_size(base_type) * BITS_PER_BYTE;
1431 member->compound_member.offset = offset & ~alignment_mask;
1432 member->compound_member.bit_offset = base_size - bit_offset - bit_size;
1434 member->compound_member.offset = offset;
1435 member->compound_member.bit_offset = bit_offset;
1438 bit_offset += bit_size;
1439 offset += bit_offset / BITS_PER_BYTE;
1440 bit_offset %= BITS_PER_BYTE;
1446 *struct_offset = offset;
1447 *struct_alignment = alignment;
1451 void layout_struct_type(compound_type_t *type)
1453 assert(type->compound != NULL);
1455 compound_t *compound = type->compound;
1456 if (!compound->complete)
1458 if (type->compound->layouted)
1460 compound->layouted = true;
1462 il_size_t offset = 0;
1463 il_alignment_t alignment = compound->alignment;
1464 bool need_pad = false;
1466 entity_t *entry = compound->members.entities;
1467 while (entry != NULL) {
1468 if (entry->kind != ENTITY_COMPOUND_MEMBER)
1471 type_t *const m_type = skip_typeref(entry->declaration.type);
1472 if (!is_type_valid(m_type))
1475 if (entry->compound_member.bitfield) {
1476 entry = pack_bitfield_members(&offset, &alignment,
1477 compound->packed, entry);
1481 il_alignment_t m_alignment = get_type_alignment_compound(m_type);
1482 if (m_alignment > alignment)
1483 alignment = m_alignment;
1485 if (!compound->packed) {
1486 il_size_t new_offset = (offset + m_alignment-1) & -m_alignment;
1488 if (new_offset > offset) {
1490 offset = new_offset;
1494 entry->compound_member.offset = offset;
1495 offset += get_type_size(m_type);
1498 entry = entry->base.next;
1501 if (!compound->packed) {
1502 il_size_t new_offset = (offset + alignment-1) & -alignment;
1503 if (new_offset > offset) {
1505 offset = new_offset;
1509 source_position_t const *const pos = &compound->base.source_position;
1511 warningf(WARN_PADDED, pos, "'%T' needs padding", type);
1512 } else if (compound->packed) {
1513 warningf(WARN_PACKED, pos, "superfluous packed attribute on '%T'", type);
1516 compound->size = offset;
1517 compound->alignment = alignment;
1520 void layout_union_type(compound_type_t *type)
1522 assert(type->compound != NULL);
1524 compound_t *compound = type->compound;
1525 if (! compound->complete)
1527 if (compound->layouted)
1529 compound->layouted = true;
1532 il_alignment_t alignment = compound->alignment;
1534 entity_t *entry = compound->members.entities;
1535 for (; entry != NULL; entry = entry->base.next) {
1536 if (entry->kind != ENTITY_COMPOUND_MEMBER)
1539 type_t *m_type = skip_typeref(entry->declaration.type);
1540 if (! is_type_valid(skip_typeref(m_type)))
1543 entry->compound_member.offset = 0;
1544 il_size_t m_size = get_type_size(m_type);
1547 il_alignment_t m_alignment = get_type_alignment_compound(m_type);
1548 if (m_alignment > alignment)
1549 alignment = m_alignment;
1551 size = (size + alignment - 1) & -alignment;
1553 compound->size = size;
1554 compound->alignment = alignment;
1557 function_parameter_t *allocate_parameter(type_t *const type)
1559 function_parameter_t *const param = obstack_alloc(&type_obst, sizeof(*param));
1560 memset(param, 0, sizeof(*param));
1565 type_t *make_function_2_type(type_t *return_type, type_t *argument_type1,
1566 type_t *argument_type2, decl_modifiers_t modifiers)
1568 function_parameter_t *const parameter2 = allocate_parameter(argument_type2);
1569 function_parameter_t *const parameter1 = allocate_parameter(argument_type1);
1570 parameter1->next = parameter2;
1572 type_t *type = allocate_type_zero(TYPE_FUNCTION);
1573 type->function.return_type = return_type;
1574 type->function.parameters = parameter1;
1575 type->function.modifiers |= modifiers;
1576 type->function.linkage = LINKAGE_C;
1578 return identify_new_type(type);
1581 type_t *make_function_1_type(type_t *return_type, type_t *argument_type,
1582 decl_modifiers_t modifiers)
1584 function_parameter_t *const parameter = allocate_parameter(argument_type);
1586 type_t *type = allocate_type_zero(TYPE_FUNCTION);
1587 type->function.return_type = return_type;
1588 type->function.parameters = parameter;
1589 type->function.modifiers |= modifiers;
1590 type->function.linkage = LINKAGE_C;
1592 return identify_new_type(type);
1595 type_t *make_function_1_type_variadic(type_t *return_type,
1596 type_t *argument_type,
1597 decl_modifiers_t modifiers)
1599 function_parameter_t *const parameter = allocate_parameter(argument_type);
1601 type_t *type = allocate_type_zero(TYPE_FUNCTION);
1602 type->function.return_type = return_type;
1603 type->function.parameters = parameter;
1604 type->function.variadic = true;
1605 type->function.modifiers |= modifiers;
1606 type->function.linkage = LINKAGE_C;
1608 return identify_new_type(type);
1611 type_t *make_function_0_type(type_t *return_type, decl_modifiers_t modifiers)
1613 type_t *type = allocate_type_zero(TYPE_FUNCTION);
1614 type->function.return_type = return_type;
1615 type->function.parameters = NULL;
1616 type->function.modifiers |= modifiers;
1617 type->function.linkage = LINKAGE_C;
1619 return identify_new_type(type);
1622 type_t *make_function_type(type_t *return_type, int n_types,
1623 type_t *const *argument_types,
1624 decl_modifiers_t modifiers)
1626 type_t *type = allocate_type_zero(TYPE_FUNCTION);
1627 type->function.return_type = return_type;
1628 type->function.modifiers |= modifiers;
1629 type->function.linkage = LINKAGE_C;
1631 function_parameter_t **anchor = &type->function.parameters;
1632 for (int i = 0; i < n_types; ++i) {
1633 function_parameter_t *parameter = allocate_parameter(argument_types[i]);
1634 *anchor = parameter;
1635 anchor = ¶meter->next;
1638 return identify_new_type(type);
1642 * Debug helper. Prints the given type to stdout.
1644 static __attribute__((unused))
1645 void dbg_type(const type_t *type)
1647 print_to_file(stderr);