7 #include "diagnostic.h"
8 #include "format_check.h"
14 #include "type_hash.h"
16 #include "lang_features.h"
17 #include "adt/bitfiddle.h"
18 #include "adt/error.h"
19 #include "adt/array.h"
21 //#define PRINT_TOKENS
22 //#define ABORT_ON_ERROR
23 #define MAX_LOOKAHEAD 2
26 declaration_t *old_declaration;
28 unsigned short namespc;
31 typedef struct declaration_specifiers_t declaration_specifiers_t;
32 struct declaration_specifiers_t {
33 source_position_t source_position;
34 unsigned char storage_class;
36 decl_modifiers_t decl_modifiers;
40 typedef declaration_t* (*parsed_declaration_func) (declaration_t *declaration);
43 static token_t lookahead_buffer[MAX_LOOKAHEAD];
44 static int lookahead_bufpos;
45 static stack_entry_t *environment_stack = NULL;
46 static stack_entry_t *label_stack = NULL;
47 static context_t *global_context = NULL;
48 static context_t *context = NULL;
49 static declaration_t *last_declaration = NULL;
50 static declaration_t *current_function = NULL;
51 static struct obstack temp_obst;
53 /** The current source position. */
54 #define HERE token.source_position
56 static type_t *type_valist;
58 static statement_t *parse_compound_statement(void);
59 static statement_t *parse_statement(void);
61 static expression_t *parse_sub_expression(unsigned precedence);
62 static expression_t *parse_expression(void);
63 static type_t *parse_typename(void);
65 static void parse_compound_type_entries(void);
66 static declaration_t *parse_declarator(
67 const declaration_specifiers_t *specifiers, bool may_be_abstract);
68 static declaration_t *record_declaration(declaration_t *declaration);
70 static void semantic_comparison(binary_expression_t *expression);
72 #define STORAGE_CLASSES \
79 #define TYPE_QUALIFIERS \
86 #ifdef PROVIDE_COMPLEX
87 #define COMPLEX_SPECIFIERS \
89 #define IMAGINARY_SPECIFIERS \
92 #define COMPLEX_SPECIFIERS
93 #define IMAGINARY_SPECIFIERS
96 #define TYPE_SPECIFIERS \
111 case T___builtin_va_list: \
115 #define DECLARATION_START \
120 #define TYPENAME_START \
125 * Allocate an AST node with given size and
126 * initialize all fields with zero.
128 static void *allocate_ast_zero(size_t size)
130 void *res = allocate_ast(size);
131 memset(res, 0, size);
136 * Returns the size of a statement node.
138 * @param kind the statement kind
140 static size_t get_statement_struct_size(statement_kind_t kind)
142 static const size_t sizes[] = {
143 [STATEMENT_COMPOUND] = sizeof(compound_statement_t),
144 [STATEMENT_RETURN] = sizeof(return_statement_t),
145 [STATEMENT_DECLARATION] = sizeof(declaration_statement_t),
146 [STATEMENT_IF] = sizeof(if_statement_t),
147 [STATEMENT_SWITCH] = sizeof(switch_statement_t),
148 [STATEMENT_EXPRESSION] = sizeof(expression_statement_t),
149 [STATEMENT_CONTINUE] = sizeof(statement_base_t),
150 [STATEMENT_BREAK] = sizeof(statement_base_t),
151 [STATEMENT_GOTO] = sizeof(goto_statement_t),
152 [STATEMENT_LABEL] = sizeof(label_statement_t),
153 [STATEMENT_CASE_LABEL] = sizeof(case_label_statement_t),
154 [STATEMENT_WHILE] = sizeof(while_statement_t),
155 [STATEMENT_DO_WHILE] = sizeof(do_while_statement_t),
156 [STATEMENT_FOR] = sizeof(for_statement_t),
157 [STATEMENT_ASM] = sizeof(asm_statement_t)
159 assert(kind <= sizeof(sizes) / sizeof(sizes[0]));
160 assert(sizes[kind] != 0);
165 * Allocate a statement node of given kind and initialize all
168 static statement_t *allocate_statement_zero(statement_kind_t kind)
170 size_t size = get_statement_struct_size(kind);
171 statement_t *res = allocate_ast_zero(size);
173 res->base.kind = kind;
178 * Returns the size of an expression node.
180 * @param kind the expression kind
182 static size_t get_expression_struct_size(expression_kind_t kind)
184 static const size_t sizes[] = {
185 [EXPR_INVALID] = sizeof(expression_base_t),
186 [EXPR_REFERENCE] = sizeof(reference_expression_t),
187 [EXPR_CONST] = sizeof(const_expression_t),
188 [EXPR_STRING_LITERAL] = sizeof(string_literal_expression_t),
189 [EXPR_WIDE_STRING_LITERAL] = sizeof(wide_string_literal_expression_t),
190 [EXPR_CALL] = sizeof(call_expression_t),
191 [EXPR_UNARY_FIRST] = sizeof(unary_expression_t),
192 [EXPR_BINARY_FIRST] = sizeof(binary_expression_t),
193 [EXPR_CONDITIONAL] = sizeof(conditional_expression_t),
194 [EXPR_SELECT] = sizeof(select_expression_t),
195 [EXPR_ARRAY_ACCESS] = sizeof(array_access_expression_t),
196 [EXPR_SIZEOF] = sizeof(sizeof_expression_t),
197 [EXPR_CLASSIFY_TYPE] = sizeof(classify_type_expression_t),
198 [EXPR_FUNCTION] = sizeof(string_literal_expression_t),
199 [EXPR_PRETTY_FUNCTION] = sizeof(string_literal_expression_t),
200 [EXPR_BUILTIN_SYMBOL] = sizeof(builtin_symbol_expression_t),
201 [EXPR_BUILTIN_CONSTANT_P] = sizeof(builtin_constant_expression_t),
202 [EXPR_BUILTIN_PREFETCH] = sizeof(builtin_prefetch_expression_t),
203 [EXPR_OFFSETOF] = sizeof(offsetof_expression_t),
204 [EXPR_VA_START] = sizeof(va_start_expression_t),
205 [EXPR_VA_ARG] = sizeof(va_arg_expression_t),
206 [EXPR_STATEMENT] = sizeof(statement_expression_t),
208 if(kind >= EXPR_UNARY_FIRST && kind <= EXPR_UNARY_LAST) {
209 return sizes[EXPR_UNARY_FIRST];
211 if(kind >= EXPR_BINARY_FIRST && kind <= EXPR_BINARY_LAST) {
212 return sizes[EXPR_BINARY_FIRST];
214 assert(kind <= sizeof(sizes) / sizeof(sizes[0]));
215 assert(sizes[kind] != 0);
220 * Allocate an expression node of given kind and initialize all
223 static expression_t *allocate_expression_zero(expression_kind_t kind)
225 size_t size = get_expression_struct_size(kind);
226 expression_t *res = allocate_ast_zero(size);
228 res->base.kind = kind;
233 * Returns the size of a type node.
235 * @param kind the type kind
237 static size_t get_type_struct_size(type_kind_t kind)
239 static const size_t sizes[] = {
240 [TYPE_ATOMIC] = sizeof(atomic_type_t),
241 [TYPE_BITFIELD] = sizeof(bitfield_type_t),
242 [TYPE_COMPOUND_STRUCT] = sizeof(compound_type_t),
243 [TYPE_COMPOUND_UNION] = sizeof(compound_type_t),
244 [TYPE_ENUM] = sizeof(enum_type_t),
245 [TYPE_FUNCTION] = sizeof(function_type_t),
246 [TYPE_POINTER] = sizeof(pointer_type_t),
247 [TYPE_ARRAY] = sizeof(array_type_t),
248 [TYPE_BUILTIN] = sizeof(builtin_type_t),
249 [TYPE_TYPEDEF] = sizeof(typedef_type_t),
250 [TYPE_TYPEOF] = sizeof(typeof_type_t),
252 assert(sizeof(sizes) / sizeof(sizes[0]) == (int) TYPE_TYPEOF + 1);
253 assert(kind <= TYPE_TYPEOF);
254 assert(sizes[kind] != 0);
259 * Allocate a type node of given kind and initialize all
262 static type_t *allocate_type_zero(type_kind_t kind)
264 size_t size = get_type_struct_size(kind);
265 type_t *res = obstack_alloc(type_obst, size);
266 memset(res, 0, size);
268 res->base.kind = kind;
273 * Returns the size of an initializer node.
275 * @param kind the initializer kind
277 static size_t get_initializer_size(initializer_kind_t kind)
279 static const size_t sizes[] = {
280 [INITIALIZER_VALUE] = sizeof(initializer_value_t),
281 [INITIALIZER_STRING] = sizeof(initializer_string_t),
282 [INITIALIZER_WIDE_STRING] = sizeof(initializer_wide_string_t),
283 [INITIALIZER_LIST] = sizeof(initializer_list_t)
285 assert(kind < sizeof(sizes) / sizeof(*sizes));
286 assert(sizes[kind] != 0);
291 * Allocate an initializer node of given kind and initialize all
294 static initializer_t *allocate_initializer_zero(initializer_kind_t kind)
296 initializer_t *result = allocate_ast_zero(get_initializer_size(kind));
303 * Free a type from the type obstack.
305 static void free_type(void *type)
307 obstack_free(type_obst, type);
311 * Returns the index of the top element of the environment stack.
313 static size_t environment_top(void)
315 return ARR_LEN(environment_stack);
319 * Returns the index of the top element of the label stack.
321 static size_t label_top(void)
323 return ARR_LEN(label_stack);
328 * Return the next token.
330 static inline void next_token(void)
332 token = lookahead_buffer[lookahead_bufpos];
333 lookahead_buffer[lookahead_bufpos] = lexer_token;
336 lookahead_bufpos = (lookahead_bufpos+1) % MAX_LOOKAHEAD;
339 print_token(stderr, &token);
340 fprintf(stderr, "\n");
345 * Return the next token with a given lookahead.
347 static inline const token_t *look_ahead(int num)
349 assert(num > 0 && num <= MAX_LOOKAHEAD);
350 int pos = (lookahead_bufpos+num-1) % MAX_LOOKAHEAD;
351 return &lookahead_buffer[pos];
354 #define eat(token_type) do { assert(token.type == token_type); next_token(); } while(0)
357 * Report a parse error because an expected token was not found.
359 static void parse_error_expected(const char *message, ...)
361 if(message != NULL) {
362 errorf(HERE, "%s", message);
365 va_start(ap, message);
366 errorf(HERE, "got '%K', expected %#k", &token, &ap, ", ");
371 * Report a type error.
373 static void type_error(const char *msg, const source_position_t source_position,
376 errorf(source_position, "%s, but found type '%T'", msg, type);
380 * Report an incompatible type.
382 static void type_error_incompatible(const char *msg,
383 const source_position_t source_position, type_t *type1, type_t *type2)
385 errorf(source_position, "%s, incompatible types: '%T' - '%T'", msg, type1, type2);
389 * Eat an complete block, ie. '{ ... }'.
391 static void eat_block(void)
393 if(token.type == '{')
396 while(token.type != '}') {
397 if(token.type == T_EOF)
399 if(token.type == '{') {
409 * Eat a statement until an ';' token.
411 static void eat_statement(void)
413 while(token.type != ';') {
414 if(token.type == T_EOF)
416 if(token.type == '}')
418 if(token.type == '{') {
428 * Eat a parenthesed term, ie. '( ... )'.
430 static void eat_paren(void)
432 if(token.type == '(')
435 while(token.type != ')') {
436 if(token.type == T_EOF)
438 if(token.type == ')' || token.type == ';' || token.type == '}') {
441 if(token.type == '(') {
445 if(token.type == '{') {
454 #define expect(expected) \
455 if(UNLIKELY(token.type != (expected))) { \
456 parse_error_expected(NULL, (expected), 0); \
462 #define expect_block(expected) \
463 if(UNLIKELY(token.type != (expected))) { \
464 parse_error_expected(NULL, (expected), 0); \
470 #define expect_void(expected) \
471 if(UNLIKELY(token.type != (expected))) { \
472 parse_error_expected(NULL, (expected), 0); \
478 static void set_context(context_t *new_context)
480 context = new_context;
482 last_declaration = new_context->declarations;
483 if(last_declaration != NULL) {
484 while(last_declaration->next != NULL) {
485 last_declaration = last_declaration->next;
491 * Search a symbol in a given namespace and returns its declaration or
492 * NULL if this symbol was not found.
494 static declaration_t *get_declaration(const symbol_t *const symbol, const namespace_t namespc)
496 declaration_t *declaration = symbol->declaration;
497 for( ; declaration != NULL; declaration = declaration->symbol_next) {
498 if(declaration->namespc == namespc)
506 * pushs an environment_entry on the environment stack and links the
507 * corresponding symbol to the new entry
509 static void stack_push(stack_entry_t **stack_ptr, declaration_t *declaration)
511 symbol_t *symbol = declaration->symbol;
512 namespace_t namespc = (namespace_t)declaration->namespc;
514 /* remember old declaration */
516 entry.symbol = symbol;
517 entry.old_declaration = symbol->declaration;
518 entry.namespc = (unsigned short) namespc;
519 ARR_APP1(stack_entry_t, *stack_ptr, entry);
521 /* replace/add declaration into declaration list of the symbol */
522 if(symbol->declaration == NULL) {
523 symbol->declaration = declaration;
525 declaration_t *iter_last = NULL;
526 declaration_t *iter = symbol->declaration;
527 for( ; iter != NULL; iter_last = iter, iter = iter->symbol_next) {
528 /* replace an entry? */
529 if(iter->namespc == namespc) {
530 if(iter_last == NULL) {
531 symbol->declaration = declaration;
533 iter_last->symbol_next = declaration;
535 declaration->symbol_next = iter->symbol_next;
540 assert(iter_last->symbol_next == NULL);
541 iter_last->symbol_next = declaration;
546 static void environment_push(declaration_t *declaration)
548 assert(declaration->source_position.input_name != NULL);
549 assert(declaration->parent_context != NULL);
550 stack_push(&environment_stack, declaration);
553 static void label_push(declaration_t *declaration)
555 declaration->parent_context = ¤t_function->context;
556 stack_push(&label_stack, declaration);
560 * pops symbols from the environment stack until @p new_top is the top element
562 static void stack_pop_to(stack_entry_t **stack_ptr, size_t new_top)
564 stack_entry_t *stack = *stack_ptr;
565 size_t top = ARR_LEN(stack);
568 assert(new_top <= top);
572 for(i = top; i > new_top; --i) {
573 stack_entry_t *entry = &stack[i - 1];
575 declaration_t *old_declaration = entry->old_declaration;
576 symbol_t *symbol = entry->symbol;
577 namespace_t namespc = (namespace_t)entry->namespc;
579 /* replace/remove declaration */
580 declaration_t *declaration = symbol->declaration;
581 assert(declaration != NULL);
582 if(declaration->namespc == namespc) {
583 if(old_declaration == NULL) {
584 symbol->declaration = declaration->symbol_next;
586 symbol->declaration = old_declaration;
589 declaration_t *iter_last = declaration;
590 declaration_t *iter = declaration->symbol_next;
591 for( ; iter != NULL; iter_last = iter, iter = iter->symbol_next) {
592 /* replace an entry? */
593 if(iter->namespc == namespc) {
594 assert(iter_last != NULL);
595 iter_last->symbol_next = old_declaration;
596 old_declaration->symbol_next = iter->symbol_next;
600 assert(iter != NULL);
604 ARR_SHRINKLEN(*stack_ptr, (int) new_top);
607 static void environment_pop_to(size_t new_top)
609 stack_pop_to(&environment_stack, new_top);
612 static void label_pop_to(size_t new_top)
614 stack_pop_to(&label_stack, new_top);
618 static int get_rank(const type_t *type)
620 assert(!is_typeref(type));
621 /* The C-standard allows promoting to int or unsigned int (see § 7.2.2
622 * and esp. footnote 108). However we can't fold constants (yet), so we
623 * can't decide whether unsigned int is possible, while int always works.
624 * (unsigned int would be preferable when possible... for stuff like
625 * struct { enum { ... } bla : 4; } ) */
626 if(type->kind == TYPE_ENUM)
627 return ATOMIC_TYPE_INT;
629 assert(type->kind == TYPE_ATOMIC);
630 const atomic_type_t *atomic_type = &type->atomic;
631 atomic_type_type_t atype = atomic_type->atype;
635 static type_t *promote_integer(type_t *type)
637 if(type->kind == TYPE_BITFIELD)
638 return promote_integer(type->bitfield.base);
640 if(get_rank(type) < ATOMIC_TYPE_INT)
647 * Create a cast expression.
649 * @param expression the expression to cast
650 * @param dest_type the destination type
652 static expression_t *create_cast_expression(expression_t *expression,
655 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST_IMPLICIT);
657 cast->unary.value = expression;
658 cast->base.datatype = dest_type;
664 * Check if a given expression represents the 0 pointer constant.
666 static bool is_null_pointer_constant(const expression_t *expression)
668 /* skip void* cast */
669 if(expression->kind == EXPR_UNARY_CAST
670 || expression->kind == EXPR_UNARY_CAST_IMPLICIT) {
671 expression = expression->unary.value;
674 /* TODO: not correct yet, should be any constant integer expression
675 * which evaluates to 0 */
676 if (expression->kind != EXPR_CONST)
679 type_t *const type = skip_typeref(expression->base.datatype);
680 if (!is_type_integer(type))
683 return expression->conste.v.int_value == 0;
687 * Create an implicit cast expression.
689 * @param expression the expression to cast
690 * @param dest_type the destination type
692 static expression_t *create_implicit_cast(expression_t *expression,
695 type_t *source_type = expression->base.datatype;
697 if(source_type == NULL)
700 source_type = skip_typeref(source_type);
701 dest_type = skip_typeref(dest_type);
703 if(source_type == dest_type)
706 switch (dest_type->kind) {
708 /* TODO warning for implicitly converting to enum */
711 if (source_type->kind != TYPE_ATOMIC &&
712 source_type->kind != TYPE_ENUM &&
713 source_type->kind != TYPE_BITFIELD) {
714 panic("casting of non-atomic types not implemented yet");
717 if(is_type_floating(dest_type) && !is_type_scalar(source_type)) {
718 type_error_incompatible("can't cast types",
719 expression->base.source_position, source_type,
724 return create_cast_expression(expression, dest_type);
727 switch (source_type->kind) {
729 if (is_null_pointer_constant(expression)) {
730 return create_cast_expression(expression, dest_type);
735 if (pointers_compatible(source_type, dest_type)) {
736 return create_cast_expression(expression, dest_type);
741 array_type_t *array_type = &source_type->array;
742 pointer_type_t *pointer_type = &dest_type->pointer;
743 if (types_compatible(array_type->element_type,
744 pointer_type->points_to)) {
745 return create_cast_expression(expression, dest_type);
751 panic("casting of non-atomic types not implemented yet");
754 type_error_incompatible("can't implicitly cast types",
755 expression->base.source_position, source_type, dest_type);
759 panic("casting of non-atomic types not implemented yet");
763 /** Implements the rules from § 6.5.16.1 */
764 static void semantic_assign(type_t *orig_type_left, expression_t **right,
767 type_t *orig_type_right = (*right)->base.datatype;
769 if(orig_type_right == NULL)
772 type_t *const type_left = skip_typeref(orig_type_left);
773 type_t *const type_right = skip_typeref(orig_type_right);
775 if ((is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) ||
776 (is_type_pointer(type_left) && is_null_pointer_constant(*right)) ||
777 (is_type_atomic(type_left, ATOMIC_TYPE_BOOL)
778 && is_type_pointer(type_right))) {
779 *right = create_implicit_cast(*right, type_left);
783 if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
784 pointer_type_t *pointer_type_left = &type_left->pointer;
785 pointer_type_t *pointer_type_right = &type_right->pointer;
786 type_t *points_to_left = pointer_type_left->points_to;
787 type_t *points_to_right = pointer_type_right->points_to;
789 points_to_left = skip_typeref(points_to_left);
790 points_to_right = skip_typeref(points_to_right);
792 /* the left type has all qualifiers from the right type */
793 unsigned missing_qualifiers
794 = points_to_right->base.qualifiers & ~points_to_left->base.qualifiers;
795 if(missing_qualifiers != 0) {
796 errorf(HERE, "destination type '%T' in %s from type '%T' lacks qualifiers '%Q' in pointed-to type", type_left, context, type_right, missing_qualifiers);
800 points_to_left = get_unqualified_type(points_to_left);
801 points_to_right = get_unqualified_type(points_to_right);
803 if(!is_type_atomic(points_to_left, ATOMIC_TYPE_VOID)
804 && !is_type_atomic(points_to_right, ATOMIC_TYPE_VOID)
805 && !types_compatible(points_to_left, points_to_right)) {
806 goto incompatible_assign_types;
809 *right = create_implicit_cast(*right, type_left);
813 if (is_type_compound(type_left)
814 && types_compatible(type_left, type_right)) {
815 *right = create_implicit_cast(*right, type_left);
819 incompatible_assign_types:
820 /* TODO: improve error message */
821 errorf(HERE, "incompatible types in %s", context);
822 errorf(HERE, "'%T' <- '%T'", orig_type_left, orig_type_right);
825 static expression_t *parse_constant_expression(void)
827 /* start parsing at precedence 7 (conditional expression) */
828 expression_t *result = parse_sub_expression(7);
830 if(!is_constant_expression(result)) {
831 errorf(result->base.source_position, "expression '%E' is not constant\n", result);
837 static expression_t *parse_assignment_expression(void)
839 /* start parsing at precedence 2 (assignment expression) */
840 return parse_sub_expression(2);
843 static type_t *make_global_typedef(const char *name, type_t *type)
845 symbol_t *const symbol = symbol_table_insert(name);
847 declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
848 declaration->namespc = NAMESPACE_NORMAL;
849 declaration->storage_class = STORAGE_CLASS_TYPEDEF;
850 declaration->type = type;
851 declaration->symbol = symbol;
852 declaration->source_position = builtin_source_position;
854 record_declaration(declaration);
856 type_t *typedef_type = allocate_type_zero(TYPE_TYPEDEF);
857 typedef_type->typedeft.declaration = declaration;
862 static const char *parse_string_literals(void)
864 assert(token.type == T_STRING_LITERAL);
865 const char *result = token.v.string;
869 while(token.type == T_STRING_LITERAL) {
870 result = concat_strings(result, token.v.string);
877 static void parse_attributes(void)
881 case T___attribute__: {
889 errorf(HERE, "EOF while parsing attribute");
908 if(token.type != T_STRING_LITERAL) {
909 parse_error_expected("while parsing assembler attribute",
914 parse_string_literals();
919 goto attributes_finished;
928 static designator_t *parse_designation(void)
930 if(token.type != '[' && token.type != '.')
933 designator_t *result = NULL;
934 designator_t *last = NULL;
937 designator_t *designator;
940 designator = allocate_ast_zero(sizeof(designator[0]));
942 designator->array_access = parse_constant_expression();
946 designator = allocate_ast_zero(sizeof(designator[0]));
948 if(token.type != T_IDENTIFIER) {
949 parse_error_expected("while parsing designator",
953 designator->symbol = token.v.symbol;
961 assert(designator != NULL);
963 last->next = designator;
972 static initializer_t *initializer_from_string(array_type_t *type,
975 /* TODO: check len vs. size of array type */
978 initializer_t *initializer = allocate_initializer_zero(INITIALIZER_STRING);
979 initializer->string.string = string;
984 static initializer_t *initializer_from_wide_string(array_type_t *const type,
985 wide_string_t *const string)
987 /* TODO: check len vs. size of array type */
990 initializer_t *const initializer =
991 allocate_initializer_zero(INITIALIZER_WIDE_STRING);
992 initializer->wide_string.string = *string;
997 static initializer_t *initializer_from_expression(type_t *type,
998 expression_t *expression)
1000 /* TODO check that expression is a constant expression */
1002 /* § 6.7.8.14/15 char array may be initialized by string literals */
1003 type_t *const expr_type = expression->base.datatype;
1004 if (is_type_array(type) && expr_type->kind == TYPE_POINTER) {
1005 array_type_t *const array_type = &type->array;
1006 type_t *const element_type = skip_typeref(array_type->element_type);
1008 if (element_type->kind == TYPE_ATOMIC) {
1009 switch (expression->kind) {
1010 case EXPR_STRING_LITERAL:
1011 if (element_type->atomic.atype == ATOMIC_TYPE_CHAR) {
1012 return initializer_from_string(array_type,
1013 expression->string.value);
1016 case EXPR_WIDE_STRING_LITERAL: {
1017 type_t *bare_wchar_type = skip_typeref(type_wchar_t);
1018 if (get_unqualified_type(element_type) == bare_wchar_type) {
1019 return initializer_from_wide_string(array_type,
1020 &expression->wide_string.value);
1030 type_t *expression_type = skip_typeref(expression->base.datatype);
1031 if(is_type_scalar(type) || types_compatible(type, expression_type)) {
1032 semantic_assign(type, &expression, "initializer");
1034 initializer_t *result = allocate_initializer_zero(INITIALIZER_VALUE);
1035 result->value.value = expression;
1043 static initializer_t *parse_sub_initializer(type_t *type,
1044 expression_t *expression,
1045 type_t *expression_type);
1047 static initializer_t *parse_sub_initializer_elem(type_t *type)
1049 if(token.type == '{') {
1050 return parse_sub_initializer(type, NULL, NULL);
1053 expression_t *expression = parse_assignment_expression();
1054 type_t *expression_type = skip_typeref(expression->base.datatype);
1056 return parse_sub_initializer(type, expression, expression_type);
1059 static bool had_initializer_brace_warning;
1061 static void skip_designator(void)
1064 if(token.type == '.') {
1066 if(token.type == T_IDENTIFIER)
1068 } else if(token.type == '[') {
1070 parse_constant_expression();
1071 if(token.type == ']')
1079 static initializer_t *parse_sub_initializer(type_t *type,
1080 expression_t *expression,
1081 type_t *expression_type)
1083 if(is_type_scalar(type)) {
1084 /* there might be extra {} hierarchies */
1085 if(token.type == '{') {
1087 if(!had_initializer_brace_warning) {
1088 warningf(HERE, "braces around scalar initializer");
1089 had_initializer_brace_warning = true;
1091 initializer_t *result = parse_sub_initializer(type, NULL, NULL);
1092 if(token.type == ',') {
1094 /* TODO: warn about excessive elements */
1100 if(expression == NULL) {
1101 expression = parse_assignment_expression();
1103 return initializer_from_expression(type, expression);
1106 /* does the expression match the currently looked at object to initialize */
1107 if(expression != NULL) {
1108 initializer_t *result = initializer_from_expression(type, expression);
1113 bool read_paren = false;
1114 if(token.type == '{') {
1119 /* descend into subtype */
1120 initializer_t *result = NULL;
1121 initializer_t **elems;
1122 if(is_type_array(type)) {
1123 array_type_t *array_type = &type->array;
1124 type_t *element_type = array_type->element_type;
1125 element_type = skip_typeref(element_type);
1127 if(token.type == '.') {
1129 "compound designator in initializer for array type '%T'",
1135 had_initializer_brace_warning = false;
1136 if(expression == NULL) {
1137 sub = parse_sub_initializer_elem(element_type);
1139 sub = parse_sub_initializer(element_type, expression,
1143 /* didn't match the subtypes -> try the parent type */
1145 assert(!read_paren);
1149 elems = NEW_ARR_F(initializer_t*, 0);
1150 ARR_APP1(initializer_t*, elems, sub);
1153 if(token.type == '}')
1156 if(token.type == '}')
1159 sub = parse_sub_initializer_elem(element_type);
1161 /* TODO error, do nicer cleanup */
1162 errorf(HERE, "member initializer didn't match");
1166 ARR_APP1(initializer_t*, elems, sub);
1169 assert(is_type_compound(type));
1170 compound_type_t *compound_type = &type->compound;
1171 context_t *context = &compound_type->declaration->context;
1173 if(token.type == '[') {
1175 "array designator in initializer for compound type '%T'",
1180 declaration_t *first = context->declarations;
1183 type_t *first_type = first->type;
1184 first_type = skip_typeref(first_type);
1187 had_initializer_brace_warning = false;
1188 if(expression == NULL) {
1189 sub = parse_sub_initializer_elem(first_type);
1191 sub = parse_sub_initializer(first_type, expression,expression_type);
1194 /* didn't match the subtypes -> try our parent type */
1196 assert(!read_paren);
1200 elems = NEW_ARR_F(initializer_t*, 0);
1201 ARR_APP1(initializer_t*, elems, sub);
1203 declaration_t *iter = first->next;
1204 for( ; iter != NULL; iter = iter->next) {
1205 if(iter->symbol == NULL)
1207 if(iter->namespc != NAMESPACE_NORMAL)
1210 if(token.type == '}')
1213 if(token.type == '}')
1216 type_t *iter_type = iter->type;
1217 iter_type = skip_typeref(iter_type);
1219 sub = parse_sub_initializer_elem(iter_type);
1221 /* TODO error, do nicer cleanup */
1222 errorf(HERE, "member initializer didn't match");
1226 ARR_APP1(initializer_t*, elems, sub);
1230 int len = ARR_LEN(elems);
1231 size_t elems_size = sizeof(initializer_t*) * len;
1233 initializer_list_t *init = allocate_ast_zero(sizeof(init[0]) + elems_size);
1235 init->initializer.kind = INITIALIZER_LIST;
1237 memcpy(init->initializers, elems, elems_size);
1240 result = (initializer_t*) init;
1243 if(token.type == ',')
1250 static initializer_t *parse_initializer(type_t *type)
1252 initializer_t *result;
1254 type = skip_typeref(type);
1256 if(token.type != '{') {
1257 expression_t *expression = parse_assignment_expression();
1258 initializer_t *initializer = initializer_from_expression(type, expression);
1259 if(initializer == NULL) {
1260 errorf(HERE, "initializer expression '%E', type '%T' is incompatible with type '%T'", expression, expression->base.datatype, type);
1265 if(is_type_scalar(type)) {
1269 expression_t *expression = parse_assignment_expression();
1270 result = initializer_from_expression(type, expression);
1272 if(token.type == ',')
1278 result = parse_sub_initializer(type, NULL, NULL);
1286 static declaration_t *parse_compound_type_specifier(bool is_struct)
1294 symbol_t *symbol = NULL;
1295 declaration_t *declaration = NULL;
1297 if (token.type == T___attribute__) {
1302 if(token.type == T_IDENTIFIER) {
1303 symbol = token.v.symbol;
1307 declaration = get_declaration(symbol, NAMESPACE_STRUCT);
1309 declaration = get_declaration(symbol, NAMESPACE_UNION);
1311 } else if(token.type != '{') {
1313 parse_error_expected("while parsing struct type specifier",
1314 T_IDENTIFIER, '{', 0);
1316 parse_error_expected("while parsing union type specifier",
1317 T_IDENTIFIER, '{', 0);
1323 if(declaration == NULL) {
1324 declaration = allocate_ast_zero(sizeof(declaration[0]));
1327 declaration->namespc = NAMESPACE_STRUCT;
1329 declaration->namespc = NAMESPACE_UNION;
1331 declaration->source_position = token.source_position;
1332 declaration->symbol = symbol;
1333 record_declaration(declaration);
1336 if(token.type == '{') {
1337 if(declaration->init.is_defined) {
1338 assert(symbol != NULL);
1339 errorf(HERE, "multiple definition of '%s %Y'",
1340 is_struct ? "struct" : "union", symbol);
1341 declaration->context.declarations = NULL;
1343 declaration->init.is_defined = true;
1345 int top = environment_top();
1346 context_t *last_context = context;
1347 set_context(&declaration->context);
1349 parse_compound_type_entries();
1352 assert(context == &declaration->context);
1353 set_context(last_context);
1354 environment_pop_to(top);
1360 static void parse_enum_entries(enum_type_t *const enum_type)
1364 if(token.type == '}') {
1366 errorf(HERE, "empty enum not allowed");
1371 declaration_t *entry = allocate_ast_zero(sizeof(entry[0]));
1373 if(token.type != T_IDENTIFIER) {
1374 parse_error_expected("while parsing enum entry", T_IDENTIFIER, 0);
1378 entry->storage_class = STORAGE_CLASS_ENUM_ENTRY;
1379 entry->type = (type_t*) enum_type;
1380 entry->symbol = token.v.symbol;
1381 entry->source_position = token.source_position;
1384 if(token.type == '=') {
1386 entry->init.enum_value = parse_constant_expression();
1391 record_declaration(entry);
1393 if(token.type != ',')
1396 } while(token.type != '}');
1401 static type_t *parse_enum_specifier(void)
1405 declaration_t *declaration;
1408 if(token.type == T_IDENTIFIER) {
1409 symbol = token.v.symbol;
1412 declaration = get_declaration(symbol, NAMESPACE_ENUM);
1413 } else if(token.type != '{') {
1414 parse_error_expected("while parsing enum type specifier",
1415 T_IDENTIFIER, '{', 0);
1422 if(declaration == NULL) {
1423 declaration = allocate_ast_zero(sizeof(declaration[0]));
1425 declaration->namespc = NAMESPACE_ENUM;
1426 declaration->source_position = token.source_position;
1427 declaration->symbol = symbol;
1430 type_t *const type = allocate_type_zero(TYPE_ENUM);
1431 type->enumt.declaration = declaration;
1433 if(token.type == '{') {
1434 if(declaration->init.is_defined) {
1435 errorf(HERE, "multiple definitions of enum %Y", symbol);
1437 record_declaration(declaration);
1438 declaration->init.is_defined = 1;
1440 parse_enum_entries(&type->enumt);
1448 * if a symbol is a typedef to another type, return true
1450 static bool is_typedef_symbol(symbol_t *symbol)
1452 const declaration_t *const declaration =
1453 get_declaration(symbol, NAMESPACE_NORMAL);
1455 declaration != NULL &&
1456 declaration->storage_class == STORAGE_CLASS_TYPEDEF;
1459 static type_t *parse_typeof(void)
1467 expression_t *expression = NULL;
1470 switch(token.type) {
1471 case T___extension__:
1472 /* this can be a prefix to a typename or an expression */
1473 /* we simply eat it now. */
1476 } while(token.type == T___extension__);
1480 if(is_typedef_symbol(token.v.symbol)) {
1481 type = parse_typename();
1483 expression = parse_expression();
1484 type = expression->base.datatype;
1489 type = parse_typename();
1493 expression = parse_expression();
1494 type = expression->base.datatype;
1500 type_t *typeof_type = allocate_type_zero(TYPE_TYPEOF);
1501 typeof_type->typeoft.expression = expression;
1502 typeof_type->typeoft.typeof_type = type;
1508 SPECIFIER_SIGNED = 1 << 0,
1509 SPECIFIER_UNSIGNED = 1 << 1,
1510 SPECIFIER_LONG = 1 << 2,
1511 SPECIFIER_INT = 1 << 3,
1512 SPECIFIER_DOUBLE = 1 << 4,
1513 SPECIFIER_CHAR = 1 << 5,
1514 SPECIFIER_SHORT = 1 << 6,
1515 SPECIFIER_LONG_LONG = 1 << 7,
1516 SPECIFIER_FLOAT = 1 << 8,
1517 SPECIFIER_BOOL = 1 << 9,
1518 SPECIFIER_VOID = 1 << 10,
1519 #ifdef PROVIDE_COMPLEX
1520 SPECIFIER_COMPLEX = 1 << 11,
1521 SPECIFIER_IMAGINARY = 1 << 12,
1525 static type_t *create_builtin_type(symbol_t *const symbol,
1526 type_t *const real_type)
1528 type_t *type = allocate_type_zero(TYPE_BUILTIN);
1529 type->builtin.symbol = symbol;
1530 type->builtin.real_type = real_type;
1532 type_t *result = typehash_insert(type);
1533 if (type != result) {
1540 static type_t *get_typedef_type(symbol_t *symbol)
1542 declaration_t *declaration = get_declaration(symbol, NAMESPACE_NORMAL);
1543 if(declaration == NULL
1544 || declaration->storage_class != STORAGE_CLASS_TYPEDEF)
1547 type_t *type = allocate_type_zero(TYPE_TYPEDEF);
1548 type->typedeft.declaration = declaration;
1553 static void parse_declaration_specifiers(declaration_specifiers_t *specifiers)
1555 type_t *type = NULL;
1556 unsigned type_qualifiers = 0;
1557 unsigned type_specifiers = 0;
1560 specifiers->source_position = token.source_position;
1563 switch(token.type) {
1566 #define MATCH_STORAGE_CLASS(token, class) \
1568 if(specifiers->storage_class != STORAGE_CLASS_NONE) { \
1569 errorf(HERE, "multiple storage classes in declaration specifiers"); \
1571 specifiers->storage_class = class; \
1575 MATCH_STORAGE_CLASS(T_typedef, STORAGE_CLASS_TYPEDEF)
1576 MATCH_STORAGE_CLASS(T_extern, STORAGE_CLASS_EXTERN)
1577 MATCH_STORAGE_CLASS(T_static, STORAGE_CLASS_STATIC)
1578 MATCH_STORAGE_CLASS(T_auto, STORAGE_CLASS_AUTO)
1579 MATCH_STORAGE_CLASS(T_register, STORAGE_CLASS_REGISTER)
1582 switch (specifiers->storage_class) {
1583 case STORAGE_CLASS_NONE:
1584 specifiers->storage_class = STORAGE_CLASS_THREAD;
1587 case STORAGE_CLASS_EXTERN:
1588 specifiers->storage_class = STORAGE_CLASS_THREAD_EXTERN;
1591 case STORAGE_CLASS_STATIC:
1592 specifiers->storage_class = STORAGE_CLASS_THREAD_STATIC;
1596 errorf(HERE, "multiple storage classes in declaration specifiers");
1602 /* type qualifiers */
1603 #define MATCH_TYPE_QUALIFIER(token, qualifier) \
1605 type_qualifiers |= qualifier; \
1609 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
1610 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
1611 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
1613 case T___extension__:
1618 /* type specifiers */
1619 #define MATCH_SPECIFIER(token, specifier, name) \
1622 if(type_specifiers & specifier) { \
1623 errorf(HERE, "multiple " name " type specifiers given"); \
1625 type_specifiers |= specifier; \
1629 MATCH_SPECIFIER(T_void, SPECIFIER_VOID, "void")
1630 MATCH_SPECIFIER(T_char, SPECIFIER_CHAR, "char")
1631 MATCH_SPECIFIER(T_short, SPECIFIER_SHORT, "short")
1632 MATCH_SPECIFIER(T_int, SPECIFIER_INT, "int")
1633 MATCH_SPECIFIER(T_float, SPECIFIER_FLOAT, "float")
1634 MATCH_SPECIFIER(T_double, SPECIFIER_DOUBLE, "double")
1635 MATCH_SPECIFIER(T_signed, SPECIFIER_SIGNED, "signed")
1636 MATCH_SPECIFIER(T_unsigned, SPECIFIER_UNSIGNED, "unsigned")
1637 MATCH_SPECIFIER(T__Bool, SPECIFIER_BOOL, "_Bool")
1638 #ifdef PROVIDE_COMPLEX
1639 MATCH_SPECIFIER(T__Complex, SPECIFIER_COMPLEX, "_Complex")
1640 MATCH_SPECIFIER(T__Imaginary, SPECIFIER_IMAGINARY, "_Imaginary")
1643 /* only in microsoft mode */
1644 specifiers->decl_modifiers |= DM_FORCEINLINE;
1648 specifiers->is_inline = true;
1653 if(type_specifiers & SPECIFIER_LONG_LONG) {
1654 errorf(HERE, "multiple type specifiers given");
1655 } else if(type_specifiers & SPECIFIER_LONG) {
1656 type_specifiers |= SPECIFIER_LONG_LONG;
1658 type_specifiers |= SPECIFIER_LONG;
1662 /* TODO: if type != NULL for the following rules should issue
1665 type = allocate_type_zero(TYPE_COMPOUND_STRUCT);
1667 type->compound.declaration = parse_compound_type_specifier(true);
1671 type = allocate_type_zero(TYPE_COMPOUND_STRUCT);
1673 type->compound.declaration = parse_compound_type_specifier(false);
1677 type = parse_enum_specifier();
1680 type = parse_typeof();
1682 case T___builtin_va_list:
1683 type = duplicate_type(type_valist);
1687 case T___attribute__:
1692 case T_IDENTIFIER: {
1693 type_t *typedef_type = get_typedef_type(token.v.symbol);
1695 if(typedef_type == NULL)
1696 goto finish_specifiers;
1699 type = typedef_type;
1703 /* function specifier */
1705 goto finish_specifiers;
1712 atomic_type_type_t atomic_type;
1714 /* match valid basic types */
1715 switch(type_specifiers) {
1716 case SPECIFIER_VOID:
1717 atomic_type = ATOMIC_TYPE_VOID;
1719 case SPECIFIER_CHAR:
1720 atomic_type = ATOMIC_TYPE_CHAR;
1722 case SPECIFIER_SIGNED | SPECIFIER_CHAR:
1723 atomic_type = ATOMIC_TYPE_SCHAR;
1725 case SPECIFIER_UNSIGNED | SPECIFIER_CHAR:
1726 atomic_type = ATOMIC_TYPE_UCHAR;
1728 case SPECIFIER_SHORT:
1729 case SPECIFIER_SIGNED | SPECIFIER_SHORT:
1730 case SPECIFIER_SHORT | SPECIFIER_INT:
1731 case SPECIFIER_SIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
1732 atomic_type = ATOMIC_TYPE_SHORT;
1734 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT:
1735 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
1736 atomic_type = ATOMIC_TYPE_USHORT;
1739 case SPECIFIER_SIGNED:
1740 case SPECIFIER_SIGNED | SPECIFIER_INT:
1741 atomic_type = ATOMIC_TYPE_INT;
1743 case SPECIFIER_UNSIGNED:
1744 case SPECIFIER_UNSIGNED | SPECIFIER_INT:
1745 atomic_type = ATOMIC_TYPE_UINT;
1747 case SPECIFIER_LONG:
1748 case SPECIFIER_SIGNED | SPECIFIER_LONG:
1749 case SPECIFIER_LONG | SPECIFIER_INT:
1750 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_INT:
1751 atomic_type = ATOMIC_TYPE_LONG;
1753 case SPECIFIER_UNSIGNED | SPECIFIER_LONG:
1754 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_INT:
1755 atomic_type = ATOMIC_TYPE_ULONG;
1757 case SPECIFIER_LONG | SPECIFIER_LONG_LONG:
1758 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
1759 case SPECIFIER_LONG | SPECIFIER_LONG_LONG | SPECIFIER_INT:
1760 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
1762 atomic_type = ATOMIC_TYPE_LONGLONG;
1764 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
1765 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
1767 atomic_type = ATOMIC_TYPE_ULONGLONG;
1769 case SPECIFIER_FLOAT:
1770 atomic_type = ATOMIC_TYPE_FLOAT;
1772 case SPECIFIER_DOUBLE:
1773 atomic_type = ATOMIC_TYPE_DOUBLE;
1775 case SPECIFIER_LONG | SPECIFIER_DOUBLE:
1776 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
1778 case SPECIFIER_BOOL:
1779 atomic_type = ATOMIC_TYPE_BOOL;
1781 #ifdef PROVIDE_COMPLEX
1782 case SPECIFIER_FLOAT | SPECIFIER_COMPLEX:
1783 atomic_type = ATOMIC_TYPE_FLOAT_COMPLEX;
1785 case SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
1786 atomic_type = ATOMIC_TYPE_DOUBLE_COMPLEX;
1788 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
1789 atomic_type = ATOMIC_TYPE_LONG_DOUBLE_COMPLEX;
1791 case SPECIFIER_FLOAT | SPECIFIER_IMAGINARY:
1792 atomic_type = ATOMIC_TYPE_FLOAT_IMAGINARY;
1794 case SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
1795 atomic_type = ATOMIC_TYPE_DOUBLE_IMAGINARY;
1797 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
1798 atomic_type = ATOMIC_TYPE_LONG_DOUBLE_IMAGINARY;
1802 /* invalid specifier combination, give an error message */
1803 if(type_specifiers == 0) {
1804 if (! strict_mode) {
1805 warningf(HERE, "no type specifiers in declaration, using int");
1806 atomic_type = ATOMIC_TYPE_INT;
1809 errorf(HERE, "no type specifiers given in declaration");
1811 } else if((type_specifiers & SPECIFIER_SIGNED) &&
1812 (type_specifiers & SPECIFIER_UNSIGNED)) {
1813 errorf(HERE, "signed and unsigned specifiers gives");
1814 } else if(type_specifiers & (SPECIFIER_SIGNED | SPECIFIER_UNSIGNED)) {
1815 errorf(HERE, "only integer types can be signed or unsigned");
1817 errorf(HERE, "multiple datatypes in declaration");
1819 atomic_type = ATOMIC_TYPE_INVALID;
1822 type = allocate_type_zero(TYPE_ATOMIC);
1823 type->atomic.atype = atomic_type;
1826 if(type_specifiers != 0) {
1827 errorf(HERE, "multiple datatypes in declaration");
1831 type->base.qualifiers = type_qualifiers;
1833 type_t *result = typehash_insert(type);
1834 if(newtype && result != type) {
1838 specifiers->type = result;
1841 static type_qualifiers_t parse_type_qualifiers(void)
1843 type_qualifiers_t type_qualifiers = TYPE_QUALIFIER_NONE;
1846 switch(token.type) {
1847 /* type qualifiers */
1848 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
1849 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
1850 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
1853 return type_qualifiers;
1858 static declaration_t *parse_identifier_list(void)
1860 declaration_t *declarations = NULL;
1861 declaration_t *last_declaration = NULL;
1863 declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
1865 declaration->source_position = token.source_position;
1866 declaration->symbol = token.v.symbol;
1869 if(last_declaration != NULL) {
1870 last_declaration->next = declaration;
1872 declarations = declaration;
1874 last_declaration = declaration;
1876 if(token.type != ',')
1879 } while(token.type == T_IDENTIFIER);
1881 return declarations;
1884 static void semantic_parameter(declaration_t *declaration)
1886 /* TODO: improve error messages */
1888 if(declaration->storage_class == STORAGE_CLASS_TYPEDEF) {
1889 errorf(HERE, "typedef not allowed in parameter list");
1890 } else if(declaration->storage_class != STORAGE_CLASS_NONE
1891 && declaration->storage_class != STORAGE_CLASS_REGISTER) {
1892 errorf(HERE, "parameter may only have none or register storage class");
1895 type_t *orig_type = declaration->type;
1896 if(orig_type == NULL)
1898 type_t *type = skip_typeref(orig_type);
1900 /* Array as last part of a parameter type is just syntactic sugar. Turn it
1901 * into a pointer. § 6.7.5.3 (7) */
1902 if (is_type_array(type)) {
1903 const array_type_t *arr_type = &type->array;
1904 type_t *element_type = arr_type->element_type;
1906 type = make_pointer_type(element_type, type->base.qualifiers);
1908 declaration->type = type;
1911 if(is_type_incomplete(type)) {
1912 errorf(HERE, "incomplete type ('%T') not allowed for parameter '%Y'",
1913 orig_type, declaration->symbol);
1917 static declaration_t *parse_parameter(void)
1919 declaration_specifiers_t specifiers;
1920 memset(&specifiers, 0, sizeof(specifiers));
1922 parse_declaration_specifiers(&specifiers);
1924 declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/true);
1926 semantic_parameter(declaration);
1931 static declaration_t *parse_parameters(function_type_t *type)
1933 if(token.type == T_IDENTIFIER) {
1934 symbol_t *symbol = token.v.symbol;
1935 if(!is_typedef_symbol(symbol)) {
1936 type->kr_style_parameters = true;
1937 return parse_identifier_list();
1941 if(token.type == ')') {
1942 type->unspecified_parameters = 1;
1945 if(token.type == T_void && look_ahead(1)->type == ')') {
1950 declaration_t *declarations = NULL;
1951 declaration_t *declaration;
1952 declaration_t *last_declaration = NULL;
1953 function_parameter_t *parameter;
1954 function_parameter_t *last_parameter = NULL;
1957 switch(token.type) {
1961 return declarations;
1964 case T___extension__:
1966 declaration = parse_parameter();
1968 parameter = obstack_alloc(type_obst, sizeof(parameter[0]));
1969 memset(parameter, 0, sizeof(parameter[0]));
1970 parameter->type = declaration->type;
1972 if(last_parameter != NULL) {
1973 last_declaration->next = declaration;
1974 last_parameter->next = parameter;
1976 type->parameters = parameter;
1977 declarations = declaration;
1979 last_parameter = parameter;
1980 last_declaration = declaration;
1984 return declarations;
1986 if(token.type != ',')
1987 return declarations;
1997 } construct_type_type_t;
1999 typedef struct construct_type_t construct_type_t;
2000 struct construct_type_t {
2001 construct_type_type_t type;
2002 construct_type_t *next;
2005 typedef struct parsed_pointer_t parsed_pointer_t;
2006 struct parsed_pointer_t {
2007 construct_type_t construct_type;
2008 type_qualifiers_t type_qualifiers;
2011 typedef struct construct_function_type_t construct_function_type_t;
2012 struct construct_function_type_t {
2013 construct_type_t construct_type;
2014 type_t *function_type;
2017 typedef struct parsed_array_t parsed_array_t;
2018 struct parsed_array_t {
2019 construct_type_t construct_type;
2020 type_qualifiers_t type_qualifiers;
2026 typedef struct construct_base_type_t construct_base_type_t;
2027 struct construct_base_type_t {
2028 construct_type_t construct_type;
2032 static construct_type_t *parse_pointer_declarator(void)
2036 parsed_pointer_t *pointer = obstack_alloc(&temp_obst, sizeof(pointer[0]));
2037 memset(pointer, 0, sizeof(pointer[0]));
2038 pointer->construct_type.type = CONSTRUCT_POINTER;
2039 pointer->type_qualifiers = parse_type_qualifiers();
2041 return (construct_type_t*) pointer;
2044 static construct_type_t *parse_array_declarator(void)
2048 parsed_array_t *array = obstack_alloc(&temp_obst, sizeof(array[0]));
2049 memset(array, 0, sizeof(array[0]));
2050 array->construct_type.type = CONSTRUCT_ARRAY;
2052 if(token.type == T_static) {
2053 array->is_static = true;
2057 type_qualifiers_t type_qualifiers = parse_type_qualifiers();
2058 if(type_qualifiers != 0) {
2059 if(token.type == T_static) {
2060 array->is_static = true;
2064 array->type_qualifiers = type_qualifiers;
2066 if(token.type == '*' && look_ahead(1)->type == ']') {
2067 array->is_variable = true;
2069 } else if(token.type != ']') {
2070 array->size = parse_assignment_expression();
2075 return (construct_type_t*) array;
2078 static construct_type_t *parse_function_declarator(declaration_t *declaration)
2082 type_t *type = allocate_type_zero(TYPE_FUNCTION);
2084 declaration_t *parameters = parse_parameters(&type->function);
2085 if(declaration != NULL) {
2086 declaration->context.declarations = parameters;
2089 construct_function_type_t *construct_function_type =
2090 obstack_alloc(&temp_obst, sizeof(construct_function_type[0]));
2091 memset(construct_function_type, 0, sizeof(construct_function_type[0]));
2092 construct_function_type->construct_type.type = CONSTRUCT_FUNCTION;
2093 construct_function_type->function_type = type;
2097 return (construct_type_t*) construct_function_type;
2100 static construct_type_t *parse_inner_declarator(declaration_t *declaration,
2101 bool may_be_abstract)
2103 /* construct a single linked list of construct_type_t's which describe
2104 * how to construct the final declarator type */
2105 construct_type_t *first = NULL;
2106 construct_type_t *last = NULL;
2109 while(token.type == '*') {
2110 construct_type_t *type = parse_pointer_declarator();
2121 /* TODO: find out if this is correct */
2124 construct_type_t *inner_types = NULL;
2126 switch(token.type) {
2128 if(declaration == NULL) {
2129 errorf(HERE, "no identifier expected in typename");
2131 declaration->symbol = token.v.symbol;
2132 declaration->source_position = token.source_position;
2138 inner_types = parse_inner_declarator(declaration, may_be_abstract);
2144 parse_error_expected("while parsing declarator", T_IDENTIFIER, '(', 0);
2145 /* avoid a loop in the outermost scope, because eat_statement doesn't
2147 if(token.type == '}' && current_function == NULL) {
2155 construct_type_t *p = last;
2158 construct_type_t *type;
2159 switch(token.type) {
2161 type = parse_function_declarator(declaration);
2164 type = parse_array_declarator();
2167 goto declarator_finished;
2170 /* insert in the middle of the list (behind p) */
2172 type->next = p->next;
2183 declarator_finished:
2186 /* append inner_types at the end of the list, we don't to set last anymore
2187 * as it's not needed anymore */
2189 assert(first == NULL);
2190 first = inner_types;
2192 last->next = inner_types;
2198 static type_t *construct_declarator_type(construct_type_t *construct_list,
2201 construct_type_t *iter = construct_list;
2202 for( ; iter != NULL; iter = iter->next) {
2203 switch(iter->type) {
2204 case CONSTRUCT_INVALID:
2205 panic("invalid type construction found");
2206 case CONSTRUCT_FUNCTION: {
2207 construct_function_type_t *construct_function_type
2208 = (construct_function_type_t*) iter;
2210 type_t *function_type = construct_function_type->function_type;
2212 function_type->function.return_type = type;
2214 type = function_type;
2218 case CONSTRUCT_POINTER: {
2219 parsed_pointer_t *parsed_pointer = (parsed_pointer_t*) iter;
2220 type_t *pointer_type = allocate_type_zero(TYPE_POINTER);
2221 pointer_type->pointer.points_to = type;
2222 pointer_type->base.qualifiers = parsed_pointer->type_qualifiers;
2224 type = pointer_type;
2228 case CONSTRUCT_ARRAY: {
2229 parsed_array_t *parsed_array = (parsed_array_t*) iter;
2230 type_t *array_type = allocate_type_zero(TYPE_ARRAY);
2232 array_type->base.qualifiers = parsed_array->type_qualifiers;
2233 array_type->array.element_type = type;
2234 array_type->array.is_static = parsed_array->is_static;
2235 array_type->array.is_variable = parsed_array->is_variable;
2236 array_type->array.size = parsed_array->size;
2243 type_t *hashed_type = typehash_insert(type);
2244 if(hashed_type != type) {
2245 /* the function type was constructed earlier freeing it here will
2246 * destroy other types... */
2247 if(iter->type != CONSTRUCT_FUNCTION) {
2257 static declaration_t *parse_declarator(
2258 const declaration_specifiers_t *specifiers, bool may_be_abstract)
2260 type_t *type = specifiers->type;
2261 declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
2262 declaration->storage_class = specifiers->storage_class;
2263 declaration->modifiers = specifiers->decl_modifiers;
2264 declaration->is_inline = specifiers->is_inline;
2266 construct_type_t *construct_type
2267 = parse_inner_declarator(declaration, may_be_abstract);
2268 declaration->type = construct_declarator_type(construct_type, type);
2270 if(construct_type != NULL) {
2271 obstack_free(&temp_obst, construct_type);
2277 static type_t *parse_abstract_declarator(type_t *base_type)
2279 construct_type_t *construct_type = parse_inner_declarator(NULL, 1);
2281 type_t *result = construct_declarator_type(construct_type, base_type);
2282 if(construct_type != NULL) {
2283 obstack_free(&temp_obst, construct_type);
2289 static declaration_t *append_declaration(declaration_t* const declaration)
2291 if (last_declaration != NULL) {
2292 last_declaration->next = declaration;
2294 context->declarations = declaration;
2296 last_declaration = declaration;
2300 static declaration_t *internal_record_declaration(
2301 declaration_t *const declaration,
2302 const bool is_function_definition)
2304 const symbol_t *const symbol = declaration->symbol;
2305 const namespace_t namespc = (namespace_t)declaration->namespc;
2307 const type_t *const type = skip_typeref(declaration->type);
2308 if (is_type_function(type) && type->function.unspecified_parameters) {
2309 warningf(declaration->source_position,
2310 "function declaration '%#T' is not a prototype",
2311 type, declaration->symbol);
2314 declaration_t *const previous_declaration = get_declaration(symbol, namespc);
2315 assert(declaration != previous_declaration);
2316 if (previous_declaration != NULL
2317 && previous_declaration->parent_context == context) {
2318 const type_t *const prev_type = skip_typeref(previous_declaration->type);
2319 if (!types_compatible(type, prev_type)) {
2320 errorf(declaration->source_position,
2321 "declaration '%#T' is incompatible with previous declaration '%#T'",
2322 type, symbol, previous_declaration->type, symbol);
2323 errorf(previous_declaration->source_position, "previous declaration of '%Y' was here", symbol);
2325 unsigned old_storage_class = previous_declaration->storage_class;
2326 unsigned new_storage_class = declaration->storage_class;
2328 /* pretend no storage class means extern for function declarations
2329 * (except if the previous declaration is neither none nor extern) */
2330 if (is_type_function(type)) {
2331 switch (old_storage_class) {
2332 case STORAGE_CLASS_NONE:
2333 old_storage_class = STORAGE_CLASS_EXTERN;
2335 case STORAGE_CLASS_EXTERN:
2336 if (new_storage_class == STORAGE_CLASS_NONE && !is_function_definition) {
2337 new_storage_class = STORAGE_CLASS_EXTERN;
2345 if (old_storage_class == STORAGE_CLASS_EXTERN &&
2346 new_storage_class == STORAGE_CLASS_EXTERN) {
2347 warn_redundant_declaration:
2348 warningf(declaration->source_position, "redundant declaration for '%Y'", symbol);
2349 warningf(previous_declaration->source_position, "previous declaration of '%Y' was here", symbol);
2350 } else if (current_function == NULL) {
2351 if (old_storage_class != STORAGE_CLASS_STATIC &&
2352 new_storage_class == STORAGE_CLASS_STATIC) {
2353 errorf(declaration->source_position, "static declaration of '%Y' follows non-static declaration", symbol);
2354 errorf(previous_declaration->source_position, "previous declaration of '%Y' was here", symbol);
2356 if (old_storage_class != STORAGE_CLASS_EXTERN) {
2357 goto warn_redundant_declaration;
2359 if (new_storage_class == STORAGE_CLASS_NONE) {
2360 previous_declaration->storage_class = STORAGE_CLASS_NONE;
2364 if (old_storage_class == new_storage_class) {
2365 errorf(declaration->source_position, "redeclaration of '%Y'", symbol);
2367 errorf(declaration->source_position, "redeclaration of '%Y' with different linkage", symbol);
2369 errorf(previous_declaration->source_position, "previous declaration of '%Y' was here", symbol);
2372 return previous_declaration;
2375 assert(declaration->parent_context == NULL);
2376 assert(declaration->symbol != NULL);
2377 assert(context != NULL);
2379 declaration->parent_context = context;
2381 environment_push(declaration);
2382 return append_declaration(declaration);
2385 static declaration_t *record_declaration(declaration_t *declaration)
2387 return internal_record_declaration(declaration, false);
2390 static declaration_t *record_function_definition(declaration_t *const declaration)
2392 return internal_record_declaration(declaration, true);
2395 static void parser_error_multiple_definition(declaration_t *declaration,
2396 const source_position_t source_position)
2398 errorf(source_position, "multiple definition of symbol '%Y'",
2399 declaration->symbol);
2400 errorf(declaration->source_position,
2401 "this is the location of the previous definition.");
2404 static bool is_declaration_specifier(const token_t *token,
2405 bool only_type_specifiers)
2407 switch(token->type) {
2411 return is_typedef_symbol(token->v.symbol);
2413 case T___extension__:
2416 return !only_type_specifiers;
2423 static void parse_init_declarator_rest(declaration_t *declaration)
2427 type_t *orig_type = declaration->type;
2428 type_t *type = NULL;
2429 if(orig_type != NULL)
2430 type = skip_typeref(orig_type);
2432 if(declaration->init.initializer != NULL) {
2433 parser_error_multiple_definition(declaration, token.source_position);
2436 initializer_t *initializer = parse_initializer(type);
2438 /* § 6.7.5 (22) array initializers for arrays with unknown size determine
2439 * the array type size */
2440 if(type != NULL && is_type_array(type) && initializer != NULL) {
2441 array_type_t *array_type = &type->array;
2443 if(array_type->size == NULL) {
2444 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
2446 cnst->base.datatype = type_size_t;
2448 switch (initializer->kind) {
2449 case INITIALIZER_LIST: {
2450 initializer_list_t *const list = &initializer->list;
2451 cnst->conste.v.int_value = list->len;
2455 case INITIALIZER_STRING: {
2456 initializer_string_t *const string = &initializer->string;
2457 cnst->conste.v.int_value = strlen(string->string) + 1;
2461 case INITIALIZER_WIDE_STRING: {
2462 initializer_wide_string_t *const string = &initializer->wide_string;
2463 cnst->conste.v.int_value = string->string.size;
2468 panic("invalid initializer type");
2471 array_type->size = cnst;
2475 if(type != NULL && is_type_function(type)) {
2476 errorf(declaration->source_position,
2477 "initializers not allowed for function types at declator '%Y' (type '%T')",
2478 declaration->symbol, orig_type);
2480 declaration->init.initializer = initializer;
2484 /* parse rest of a declaration without any declarator */
2485 static void parse_anonymous_declaration_rest(
2486 const declaration_specifiers_t *specifiers,
2487 parsed_declaration_func finished_declaration)
2491 declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
2493 declaration->type = specifiers->type;
2494 declaration->storage_class = specifiers->storage_class;
2495 declaration->source_position = specifiers->source_position;
2497 if (declaration->storage_class != STORAGE_CLASS_NONE) {
2498 warningf(declaration->source_position, "useless storage class in empty declaration");
2501 type_t *type = declaration->type;
2502 switch (type->kind) {
2503 case TYPE_COMPOUND_STRUCT:
2504 case TYPE_COMPOUND_UNION: {
2505 const compound_type_t *compound_type = &type->compound;
2506 if (compound_type->declaration->symbol == NULL) {
2507 warningf(declaration->source_position, "unnamed struct/union that defines no instances");
2516 warningf(declaration->source_position, "empty declaration");
2520 finished_declaration(declaration);
2523 static void parse_declaration_rest(declaration_t *ndeclaration,
2524 const declaration_specifiers_t *specifiers,
2525 parsed_declaration_func finished_declaration)
2528 declaration_t *declaration = finished_declaration(ndeclaration);
2530 type_t *orig_type = declaration->type;
2531 type_t *type = skip_typeref(orig_type);
2533 if(type->kind != TYPE_FUNCTION && declaration->is_inline) {
2534 warningf(declaration->source_position,
2535 "variable '%Y' declared 'inline'\n", declaration->symbol);
2538 if(token.type == '=') {
2539 parse_init_declarator_rest(declaration);
2542 if(token.type != ',')
2546 ndeclaration = parse_declarator(specifiers, /*may_be_abstract=*/false);
2551 static declaration_t *finished_kr_declaration(declaration_t *declaration)
2553 /* TODO: check that it was actually a parameter that gets a type */
2555 /* we should have a declaration for the parameter in the current
2557 return record_declaration(declaration);
2560 static void parse_declaration(parsed_declaration_func finished_declaration)
2562 declaration_specifiers_t specifiers;
2563 memset(&specifiers, 0, sizeof(specifiers));
2564 parse_declaration_specifiers(&specifiers);
2566 if(token.type == ';') {
2567 parse_anonymous_declaration_rest(&specifiers, finished_declaration);
2569 declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/false);
2570 parse_declaration_rest(declaration, &specifiers, finished_declaration);
2574 static void parse_kr_declaration_list(declaration_t *declaration)
2576 type_t *type = skip_typeref(declaration->type);
2577 if(!is_type_function(type))
2580 if(!type->function.kr_style_parameters)
2583 /* push function parameters */
2584 int top = environment_top();
2585 context_t *last_context = context;
2586 set_context(&declaration->context);
2588 declaration_t *parameter = declaration->context.declarations;
2589 for( ; parameter != NULL; parameter = parameter->next) {
2590 assert(parameter->parent_context == NULL);
2591 parameter->parent_context = context;
2592 environment_push(parameter);
2595 /* parse declaration list */
2596 while(is_declaration_specifier(&token, false)) {
2597 parse_declaration(finished_kr_declaration);
2600 /* pop function parameters */
2601 assert(context == &declaration->context);
2602 set_context(last_context);
2603 environment_pop_to(top);
2605 /* update function type */
2606 type_t *new_type = duplicate_type(type);
2607 new_type->function.kr_style_parameters = false;
2609 function_parameter_t *parameters = NULL;
2610 function_parameter_t *last_parameter = NULL;
2612 declaration_t *parameter_declaration = declaration->context.declarations;
2613 for( ; parameter_declaration != NULL;
2614 parameter_declaration = parameter_declaration->next) {
2615 type_t *parameter_type = parameter_declaration->type;
2616 if(parameter_type == NULL) {
2618 errorf(HERE, "no type specified for function parameter '%Y'",
2619 parameter_declaration->symbol);
2621 warningf(HERE, "no type specified for function parameter '%Y', using int",
2622 parameter_declaration->symbol);
2623 parameter_type = type_int;
2624 parameter_declaration->type = parameter_type;
2628 semantic_parameter(parameter_declaration);
2629 parameter_type = parameter_declaration->type;
2631 function_parameter_t *function_parameter
2632 = obstack_alloc(type_obst, sizeof(function_parameter[0]));
2633 memset(function_parameter, 0, sizeof(function_parameter[0]));
2635 function_parameter->type = parameter_type;
2636 if(last_parameter != NULL) {
2637 last_parameter->next = function_parameter;
2639 parameters = function_parameter;
2641 last_parameter = function_parameter;
2643 new_type->function.parameters = parameters;
2645 type = typehash_insert(new_type);
2646 if(type != new_type) {
2647 obstack_free(type_obst, new_type);
2650 declaration->type = type;
2653 static void parse_external_declaration(void)
2655 /* function-definitions and declarations both start with declaration
2657 declaration_specifiers_t specifiers;
2658 memset(&specifiers, 0, sizeof(specifiers));
2659 parse_declaration_specifiers(&specifiers);
2661 /* must be a declaration */
2662 if(token.type == ';') {
2663 parse_anonymous_declaration_rest(&specifiers, append_declaration);
2667 /* declarator is common to both function-definitions and declarations */
2668 declaration_t *ndeclaration = parse_declarator(&specifiers, /*may_be_abstract=*/false);
2670 /* must be a declaration */
2671 if(token.type == ',' || token.type == '=' || token.type == ';') {
2672 parse_declaration_rest(ndeclaration, &specifiers, record_declaration);
2676 /* must be a function definition */
2677 parse_kr_declaration_list(ndeclaration);
2679 if(token.type != '{') {
2680 parse_error_expected("while parsing function definition", '{', 0);
2685 type_t *type = ndeclaration->type;
2691 /* note that we don't skip typerefs: the standard doesn't allow them here
2692 * (so we can't use is_type_function here) */
2693 if(type->kind != TYPE_FUNCTION) {
2694 errorf(HERE, "declarator '%#T' has a body but is not a function type", type, ndeclaration->symbol);
2699 /* § 6.7.5.3 (14) a function definition with () means no
2700 * parameters (and not unspecified parameters) */
2701 if(type->function.unspecified_parameters) {
2702 type_t *duplicate = duplicate_type(type);
2703 duplicate->function.unspecified_parameters = false;
2705 type = typehash_insert(duplicate);
2706 if(type != duplicate) {
2707 obstack_free(type_obst, duplicate);
2709 ndeclaration->type = type;
2712 declaration_t *const declaration = record_function_definition(ndeclaration);
2713 if(ndeclaration != declaration) {
2714 declaration->context = ndeclaration->context;
2716 type = skip_typeref(declaration->type);
2718 /* push function parameters and switch context */
2719 int top = environment_top();
2720 context_t *last_context = context;
2721 set_context(&declaration->context);
2723 declaration_t *parameter = declaration->context.declarations;
2724 for( ; parameter != NULL; parameter = parameter->next) {
2725 assert(parameter->parent_context == NULL || parameter->parent_context == context);
2726 parameter->parent_context = context;
2727 environment_push(parameter);
2730 if(declaration->init.statement != NULL) {
2731 parser_error_multiple_definition(declaration, token.source_position);
2733 goto end_of_parse_external_declaration;
2735 /* parse function body */
2736 int label_stack_top = label_top();
2737 declaration_t *old_current_function = current_function;
2738 current_function = declaration;
2740 declaration->init.statement = parse_compound_statement();
2742 assert(current_function == declaration);
2743 current_function = old_current_function;
2744 label_pop_to(label_stack_top);
2747 end_of_parse_external_declaration:
2748 assert(context == &declaration->context);
2749 set_context(last_context);
2750 environment_pop_to(top);
2753 static type_t *make_bitfield_type(type_t *base, expression_t *size)
2755 type_t *type = allocate_type_zero(TYPE_BITFIELD);
2756 type->bitfield.base = base;
2757 type->bitfield.size = size;
2762 static void parse_struct_declarators(const declaration_specifiers_t *specifiers)
2764 /* TODO: check constraints for struct declarations (in specifiers) */
2766 declaration_t *declaration;
2768 if(token.type == ':') {
2771 type_t *base_type = specifiers->type;
2772 expression_t *size = parse_constant_expression();
2774 type_t *type = make_bitfield_type(base_type, size);
2776 declaration = allocate_ast_zero(sizeof(declaration[0]));
2778 declaration->namespc = NAMESPACE_NORMAL;
2779 declaration->storage_class = STORAGE_CLASS_NONE;
2780 declaration->source_position = token.source_position;
2781 declaration->modifiers = specifiers->decl_modifiers;
2782 declaration->type = type;
2784 record_declaration(declaration);
2786 declaration = parse_declarator(specifiers,/*may_be_abstract=*/true);
2788 if(token.type == ':') {
2790 expression_t *size = parse_constant_expression();
2792 type_t *type = make_bitfield_type(declaration->type, size);
2793 declaration->type = type;
2796 record_declaration(declaration);
2798 if(token.type != ',')
2805 static void parse_compound_type_entries(void)
2809 while(token.type != '}' && token.type != T_EOF) {
2810 declaration_specifiers_t specifiers;
2811 memset(&specifiers, 0, sizeof(specifiers));
2812 parse_declaration_specifiers(&specifiers);
2814 parse_struct_declarators(&specifiers);
2816 if(token.type == T_EOF) {
2817 errorf(HERE, "EOF while parsing struct");
2822 static type_t *parse_typename(void)
2824 declaration_specifiers_t specifiers;
2825 memset(&specifiers, 0, sizeof(specifiers));
2826 parse_declaration_specifiers(&specifiers);
2827 if(specifiers.storage_class != STORAGE_CLASS_NONE) {
2828 /* TODO: improve error message, user does probably not know what a
2829 * storage class is...
2831 errorf(HERE, "typename may not have a storage class");
2834 type_t *result = parse_abstract_declarator(specifiers.type);
2842 typedef expression_t* (*parse_expression_function) (unsigned precedence);
2843 typedef expression_t* (*parse_expression_infix_function) (unsigned precedence,
2844 expression_t *left);
2846 typedef struct expression_parser_function_t expression_parser_function_t;
2847 struct expression_parser_function_t {
2848 unsigned precedence;
2849 parse_expression_function parser;
2850 unsigned infix_precedence;
2851 parse_expression_infix_function infix_parser;
2854 expression_parser_function_t expression_parsers[T_LAST_TOKEN];
2857 * Creates a new invalid expression.
2859 static expression_t *create_invalid_expression(void)
2861 expression_t *expression = allocate_expression_zero(EXPR_INVALID);
2862 expression->base.source_position = token.source_position;
2866 static expression_t *expected_expression_error(void)
2868 errorf(HERE, "expected expression, got token '%K'", &token);
2872 return create_invalid_expression();
2876 * Parse a string constant.
2878 static expression_t *parse_string_const(void)
2880 expression_t *cnst = allocate_expression_zero(EXPR_STRING_LITERAL);
2881 cnst->base.datatype = type_string;
2882 cnst->string.value = parse_string_literals();
2888 * Parse a wide string constant.
2890 static expression_t *parse_wide_string_const(void)
2892 expression_t *const cnst = allocate_expression_zero(EXPR_WIDE_STRING_LITERAL);
2893 cnst->base.datatype = type_wchar_t_ptr;
2894 cnst->wide_string.value = token.v.wide_string; /* TODO concatenate */
2900 * Parse an integer constant.
2902 static expression_t *parse_int_const(void)
2904 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
2905 cnst->base.datatype = token.datatype;
2906 cnst->conste.v.int_value = token.v.intvalue;
2914 * Parse a float constant.
2916 static expression_t *parse_float_const(void)
2918 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
2919 cnst->base.datatype = token.datatype;
2920 cnst->conste.v.float_value = token.v.floatvalue;
2927 static declaration_t *create_implicit_function(symbol_t *symbol,
2928 const source_position_t source_position)
2930 type_t *ntype = allocate_type_zero(TYPE_FUNCTION);
2931 ntype->function.return_type = type_int;
2932 ntype->function.unspecified_parameters = true;
2934 type_t *type = typehash_insert(ntype);
2939 declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
2941 declaration->storage_class = STORAGE_CLASS_EXTERN;
2942 declaration->type = type;
2943 declaration->symbol = symbol;
2944 declaration->source_position = source_position;
2945 declaration->parent_context = global_context;
2947 environment_push(declaration);
2948 declaration->next = context->declarations;
2949 context->declarations = declaration;
2955 * Creates a return_type (func)(argument_type) function type if not
2958 * @param return_type the return type
2959 * @param argument_type the argument type
2961 static type_t *make_function_1_type(type_t *return_type, type_t *argument_type)
2963 function_parameter_t *parameter
2964 = obstack_alloc(type_obst, sizeof(parameter[0]));
2965 memset(parameter, 0, sizeof(parameter[0]));
2966 parameter->type = argument_type;
2968 type_t *type = allocate_type_zero(TYPE_FUNCTION);
2969 type->function.return_type = return_type;
2970 type->function.parameters = parameter;
2972 type_t *result = typehash_insert(type);
2973 if(result != type) {
2981 * Creates a function type for some function like builtins.
2983 * @param symbol the symbol describing the builtin
2985 static type_t *get_builtin_symbol_type(symbol_t *symbol)
2987 switch(symbol->ID) {
2988 case T___builtin_alloca:
2989 return make_function_1_type(type_void_ptr, type_size_t);
2990 case T___builtin_nan:
2991 return make_function_1_type(type_double, type_string);
2992 case T___builtin_nanf:
2993 return make_function_1_type(type_float, type_string);
2994 case T___builtin_nand:
2995 return make_function_1_type(type_long_double, type_string);
2996 case T___builtin_va_end:
2997 return make_function_1_type(type_void, type_valist);
2999 panic("not implemented builtin symbol found");
3004 * Performs automatic type cast as described in § 6.3.2.1.
3006 * @param orig_type the original type
3008 static type_t *automatic_type_conversion(type_t *orig_type)
3010 if(orig_type == NULL)
3013 type_t *type = skip_typeref(orig_type);
3014 if(is_type_array(type)) {
3015 array_type_t *array_type = &type->array;
3016 type_t *element_type = array_type->element_type;
3017 unsigned qualifiers = array_type->type.qualifiers;
3019 return make_pointer_type(element_type, qualifiers);
3022 if(is_type_function(type)) {
3023 return make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
3030 * reverts the automatic casts of array to pointer types and function
3031 * to function-pointer types as defined § 6.3.2.1
3033 type_t *revert_automatic_type_conversion(const expression_t *expression)
3035 if(expression->base.datatype == NULL)
3038 switch(expression->kind) {
3039 case EXPR_REFERENCE: {
3040 const reference_expression_t *ref = &expression->reference;
3041 return ref->declaration->type;
3044 const select_expression_t *select = &expression->select;
3045 return select->compound_entry->type;
3047 case EXPR_UNARY_DEREFERENCE: {
3048 expression_t *value = expression->unary.value;
3049 type_t *type = skip_typeref(value->base.datatype);
3050 pointer_type_t *pointer_type = &type->pointer;
3052 return pointer_type->points_to;
3054 case EXPR_BUILTIN_SYMBOL: {
3055 const builtin_symbol_expression_t *builtin
3056 = &expression->builtin_symbol;
3057 return get_builtin_symbol_type(builtin->symbol);
3059 case EXPR_ARRAY_ACCESS: {
3060 const array_access_expression_t *array_access
3061 = &expression->array_access;
3062 const expression_t *array_ref = array_access->array_ref;
3063 type_t *type_left = skip_typeref(array_ref->base.datatype);
3064 assert(is_type_pointer(type_left));
3065 pointer_type_t *pointer_type = &type_left->pointer;
3066 return pointer_type->points_to;
3073 return expression->base.datatype;
3076 static expression_t *parse_reference(void)
3078 expression_t *expression = allocate_expression_zero(EXPR_REFERENCE);
3080 reference_expression_t *ref = &expression->reference;
3081 ref->symbol = token.v.symbol;
3083 declaration_t *declaration = get_declaration(ref->symbol, NAMESPACE_NORMAL);
3085 source_position_t source_position = token.source_position;
3088 if(declaration == NULL) {
3089 if (! strict_mode && token.type == '(') {
3090 /* an implicitly defined function */
3091 warningf(HERE, "implicit declaration of function '%Y'",
3094 declaration = create_implicit_function(ref->symbol,
3097 errorf(HERE, "unknown symbol '%Y' found.", ref->symbol);
3102 type_t *type = declaration->type;
3104 /* we always do the auto-type conversions; the & and sizeof parser contains
3105 * code to revert this! */
3106 type = automatic_type_conversion(type);
3108 ref->declaration = declaration;
3109 ref->expression.datatype = type;
3114 static void check_cast_allowed(expression_t *expression, type_t *dest_type)
3118 /* TODO check if explicit cast is allowed and issue warnings/errors */
3121 static expression_t *parse_cast(void)
3123 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST);
3125 cast->base.source_position = token.source_position;
3127 type_t *type = parse_typename();
3130 expression_t *value = parse_sub_expression(20);
3132 check_cast_allowed(value, type);
3134 cast->base.datatype = type;
3135 cast->unary.value = value;
3140 static expression_t *parse_statement_expression(void)
3142 expression_t *expression = allocate_expression_zero(EXPR_STATEMENT);
3144 statement_t *statement = parse_compound_statement();
3145 expression->statement.statement = statement;
3146 if(statement == NULL) {
3151 assert(statement->kind == STATEMENT_COMPOUND);
3152 compound_statement_t *compound_statement = &statement->compound;
3154 /* find last statement and use it's type */
3155 const statement_t *last_statement = NULL;
3156 const statement_t *iter = compound_statement->statements;
3157 for( ; iter != NULL; iter = iter->base.next) {
3158 last_statement = iter;
3161 if(last_statement->kind == STATEMENT_EXPRESSION) {
3162 const expression_statement_t *expression_statement
3163 = &last_statement->expression;
3164 expression->base.datatype
3165 = expression_statement->expression->base.datatype;
3167 expression->base.datatype = type_void;
3175 static expression_t *parse_brace_expression(void)
3179 switch(token.type) {
3181 /* gcc extension: a statement expression */
3182 return parse_statement_expression();
3186 return parse_cast();
3188 if(is_typedef_symbol(token.v.symbol)) {
3189 return parse_cast();
3193 expression_t *result = parse_expression();
3199 static expression_t *parse_function_keyword(void)
3204 if (current_function == NULL) {
3205 errorf(HERE, "'__func__' used outside of a function");
3208 string_literal_expression_t *expression
3209 = allocate_ast_zero(sizeof(expression[0]));
3211 expression->expression.kind = EXPR_FUNCTION;
3212 expression->expression.datatype = type_string;
3213 expression->value = current_function->symbol->string;
3215 return (expression_t*) expression;
3218 static expression_t *parse_pretty_function_keyword(void)
3220 eat(T___PRETTY_FUNCTION__);
3223 if (current_function == NULL) {
3224 errorf(HERE, "'__PRETTY_FUNCTION__' used outside of a function");
3227 string_literal_expression_t *expression
3228 = allocate_ast_zero(sizeof(expression[0]));
3230 expression->expression.kind = EXPR_PRETTY_FUNCTION;
3231 expression->expression.datatype = type_string;
3232 expression->value = current_function->symbol->string;
3234 return (expression_t*) expression;
3237 static designator_t *parse_designator(void)
3239 designator_t *result = allocate_ast_zero(sizeof(result[0]));
3241 if(token.type != T_IDENTIFIER) {
3242 parse_error_expected("while parsing member designator",
3247 result->symbol = token.v.symbol;
3250 designator_t *last_designator = result;
3252 if(token.type == '.') {
3254 if(token.type != T_IDENTIFIER) {
3255 parse_error_expected("while parsing member designator",
3260 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
3261 designator->symbol = token.v.symbol;
3264 last_designator->next = designator;
3265 last_designator = designator;
3268 if(token.type == '[') {
3270 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
3271 designator->array_access = parse_expression();
3272 if(designator->array_access == NULL) {
3278 last_designator->next = designator;
3279 last_designator = designator;
3288 static expression_t *parse_offsetof(void)
3290 eat(T___builtin_offsetof);
3292 expression_t *expression = allocate_expression_zero(EXPR_OFFSETOF);
3293 expression->base.datatype = type_size_t;
3296 expression->offsetofe.type = parse_typename();
3298 expression->offsetofe.designator = parse_designator();
3304 static expression_t *parse_va_start(void)
3306 eat(T___builtin_va_start);
3308 expression_t *expression = allocate_expression_zero(EXPR_VA_START);
3311 expression->va_starte.ap = parse_assignment_expression();
3313 expression_t *const expr = parse_assignment_expression();
3314 if (expr->kind == EXPR_REFERENCE) {
3315 declaration_t *const decl = expr->reference.declaration;
3316 if (decl->parent_context == ¤t_function->context &&
3317 decl->next == NULL) {
3318 expression->va_starte.parameter = decl;
3323 errorf(expr->base.source_position, "second argument of 'va_start' must be last parameter of the current function");
3325 return create_invalid_expression();
3328 static expression_t *parse_va_arg(void)
3330 eat(T___builtin_va_arg);
3332 expression_t *expression = allocate_expression_zero(EXPR_VA_ARG);
3335 expression->va_arge.ap = parse_assignment_expression();
3337 expression->base.datatype = parse_typename();
3343 static expression_t *parse_builtin_symbol(void)
3345 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_SYMBOL);
3347 symbol_t *symbol = token.v.symbol;
3349 expression->builtin_symbol.symbol = symbol;
3352 type_t *type = get_builtin_symbol_type(symbol);
3353 type = automatic_type_conversion(type);
3355 expression->base.datatype = type;
3359 static expression_t *parse_builtin_constant(void)
3361 eat(T___builtin_constant_p);
3363 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_CONSTANT_P);
3366 expression->builtin_constant.value = parse_assignment_expression();
3368 expression->base.datatype = type_int;
3373 static expression_t *parse_builtin_prefetch(void)
3375 eat(T___builtin_prefetch);
3377 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_PREFETCH);
3380 expression->builtin_prefetch.adr = parse_assignment_expression();
3381 if (token.type == ',') {
3383 expression->builtin_prefetch.rw = parse_assignment_expression();
3385 if (token.type == ',') {
3387 expression->builtin_prefetch.locality = parse_assignment_expression();
3390 expression->base.datatype = type_void;
3395 static expression_t *parse_compare_builtin(void)
3397 expression_t *expression;
3399 switch(token.type) {
3400 case T___builtin_isgreater:
3401 expression = allocate_expression_zero(EXPR_BINARY_ISGREATER);
3403 case T___builtin_isgreaterequal:
3404 expression = allocate_expression_zero(EXPR_BINARY_ISGREATEREQUAL);
3406 case T___builtin_isless:
3407 expression = allocate_expression_zero(EXPR_BINARY_ISLESS);
3409 case T___builtin_islessequal:
3410 expression = allocate_expression_zero(EXPR_BINARY_ISLESSEQUAL);
3412 case T___builtin_islessgreater:
3413 expression = allocate_expression_zero(EXPR_BINARY_ISLESSGREATER);
3415 case T___builtin_isunordered:
3416 expression = allocate_expression_zero(EXPR_BINARY_ISUNORDERED);
3419 panic("invalid compare builtin found");
3425 expression->binary.left = parse_assignment_expression();
3427 expression->binary.right = parse_assignment_expression();
3430 type_t *orig_type_left = expression->binary.left->base.datatype;
3431 type_t *orig_type_right = expression->binary.right->base.datatype;
3432 if(orig_type_left == NULL || orig_type_right == NULL)
3435 type_t *type_left = skip_typeref(orig_type_left);
3436 type_t *type_right = skip_typeref(orig_type_right);
3437 if(!is_type_floating(type_left) && !is_type_floating(type_right)) {
3438 type_error_incompatible("invalid operands in comparison",
3439 token.source_position, type_left, type_right);
3441 semantic_comparison(&expression->binary);
3447 static expression_t *parse_builtin_expect(void)
3449 eat(T___builtin_expect);
3451 expression_t *expression
3452 = allocate_expression_zero(EXPR_BINARY_BUILTIN_EXPECT);
3455 expression->binary.left = parse_assignment_expression();
3457 expression->binary.right = parse_constant_expression();
3460 expression->base.datatype = expression->binary.left->base.datatype;
3465 static expression_t *parse_assume(void) {
3468 expression_t *expression
3469 = allocate_expression_zero(EXPR_UNARY_ASSUME);
3472 expression->unary.value = parse_assignment_expression();
3475 expression->base.datatype = type_void;
3479 static expression_t *parse_alignof(void) {
3482 expression_t *expression
3483 = allocate_expression_zero(EXPR_ALIGNOF);
3486 expression->alignofe.type = parse_typename();
3489 expression->base.datatype = type_size_t;
3493 static expression_t *parse_primary_expression(void)
3495 switch(token.type) {
3497 return parse_int_const();
3498 case T_FLOATINGPOINT:
3499 return parse_float_const();
3500 case T_STRING_LITERAL:
3501 return parse_string_const();
3502 case T_WIDE_STRING_LITERAL:
3503 return parse_wide_string_const();
3505 return parse_reference();
3506 case T___FUNCTION__:
3508 return parse_function_keyword();
3509 case T___PRETTY_FUNCTION__:
3510 return parse_pretty_function_keyword();
3511 case T___builtin_offsetof:
3512 return parse_offsetof();
3513 case T___builtin_va_start:
3514 return parse_va_start();
3515 case T___builtin_va_arg:
3516 return parse_va_arg();
3517 case T___builtin_expect:
3518 return parse_builtin_expect();
3519 case T___builtin_nanf:
3520 case T___builtin_alloca:
3521 case T___builtin_va_end:
3522 return parse_builtin_symbol();
3523 case T___builtin_isgreater:
3524 case T___builtin_isgreaterequal:
3525 case T___builtin_isless:
3526 case T___builtin_islessequal:
3527 case T___builtin_islessgreater:
3528 case T___builtin_isunordered:
3529 return parse_compare_builtin();
3530 case T___builtin_constant_p:
3531 return parse_builtin_constant();
3532 case T___builtin_prefetch:
3533 return parse_builtin_prefetch();
3535 return parse_alignof();
3537 return parse_assume();
3540 return parse_brace_expression();
3543 errorf(HERE, "unexpected token '%K'", &token);
3546 return create_invalid_expression();
3549 static expression_t *parse_array_expression(unsigned precedence,
3556 expression_t *inside = parse_expression();
3558 array_access_expression_t *array_access
3559 = allocate_ast_zero(sizeof(array_access[0]));
3561 array_access->expression.kind = EXPR_ARRAY_ACCESS;
3563 type_t *type_left = left->base.datatype;
3564 type_t *type_inside = inside->base.datatype;
3565 type_t *return_type = NULL;
3567 if(type_left != NULL && type_inside != NULL) {
3568 type_left = skip_typeref(type_left);
3569 type_inside = skip_typeref(type_inside);
3571 if(is_type_pointer(type_left)) {
3572 pointer_type_t *pointer = &type_left->pointer;
3573 return_type = pointer->points_to;
3574 array_access->array_ref = left;
3575 array_access->index = inside;
3576 } else if(is_type_pointer(type_inside)) {
3577 pointer_type_t *pointer = &type_inside->pointer;
3578 return_type = pointer->points_to;
3579 array_access->array_ref = inside;
3580 array_access->index = left;
3581 array_access->flipped = true;
3583 errorf(HERE, "array access on object with non-pointer types '%T', '%T'", type_left, type_inside);
3586 array_access->array_ref = left;
3587 array_access->index = inside;
3590 if(token.type != ']') {
3591 parse_error_expected("Problem while parsing array access", ']', 0);
3592 return (expression_t*) array_access;
3596 return_type = automatic_type_conversion(return_type);
3597 array_access->expression.datatype = return_type;
3599 return (expression_t*) array_access;
3602 static expression_t *parse_sizeof(unsigned precedence)
3606 sizeof_expression_t *sizeof_expression
3607 = allocate_ast_zero(sizeof(sizeof_expression[0]));
3608 sizeof_expression->expression.kind = EXPR_SIZEOF;
3609 sizeof_expression->expression.datatype = type_size_t;
3611 if(token.type == '(' && is_declaration_specifier(look_ahead(1), true)) {
3613 sizeof_expression->type = parse_typename();
3616 expression_t *expression = parse_sub_expression(precedence);
3617 expression->base.datatype = revert_automatic_type_conversion(expression);
3619 sizeof_expression->type = expression->base.datatype;
3620 sizeof_expression->size_expression = expression;
3623 return (expression_t*) sizeof_expression;
3626 static expression_t *parse_select_expression(unsigned precedence,
3627 expression_t *compound)
3630 assert(token.type == '.' || token.type == T_MINUSGREATER);
3632 bool is_pointer = (token.type == T_MINUSGREATER);
3635 expression_t *select = allocate_expression_zero(EXPR_SELECT);
3636 select->select.compound = compound;
3638 if(token.type != T_IDENTIFIER) {
3639 parse_error_expected("while parsing select", T_IDENTIFIER, 0);
3642 symbol_t *symbol = token.v.symbol;
3643 select->select.symbol = symbol;
3646 type_t *orig_type = compound->base.datatype;
3647 if(orig_type == NULL)
3648 return create_invalid_expression();
3650 type_t *type = skip_typeref(orig_type);
3652 type_t *type_left = type;
3654 if(type->kind != TYPE_POINTER) {
3655 errorf(HERE, "left hand side of '->' is not a pointer, but '%T'", orig_type);
3656 return create_invalid_expression();
3658 pointer_type_t *pointer_type = &type->pointer;
3659 type_left = pointer_type->points_to;
3661 type_left = skip_typeref(type_left);
3663 if(type_left->kind != TYPE_COMPOUND_STRUCT
3664 && type_left->kind != TYPE_COMPOUND_UNION) {
3665 errorf(HERE, "request for member '%Y' in something not a struct or "
3666 "union, but '%T'", symbol, type_left);
3667 return create_invalid_expression();
3670 compound_type_t *compound_type = &type_left->compound;
3671 declaration_t *declaration = compound_type->declaration;
3673 if(!declaration->init.is_defined) {
3674 errorf(HERE, "request for member '%Y' of incomplete type '%T'",
3676 return create_invalid_expression();
3679 declaration_t *iter = declaration->context.declarations;
3680 for( ; iter != NULL; iter = iter->next) {
3681 if(iter->symbol == symbol) {
3686 errorf(HERE, "'%T' has no member named '%Y'", orig_type, symbol);
3687 return create_invalid_expression();
3690 /* we always do the auto-type conversions; the & and sizeof parser contains
3691 * code to revert this! */
3692 type_t *expression_type = automatic_type_conversion(iter->type);
3694 select->select.compound_entry = iter;
3695 select->base.datatype = expression_type;
3697 if(expression_type->kind == TYPE_BITFIELD) {
3698 expression_t *extract
3699 = allocate_expression_zero(EXPR_UNARY_BITFIELD_EXTRACT);
3700 extract->unary.value = select;
3701 extract->base.datatype = expression_type->bitfield.base;
3710 * Parse a call expression, ie. expression '( ... )'.
3712 * @param expression the function address
3714 static expression_t *parse_call_expression(unsigned precedence,
3715 expression_t *expression)
3718 expression_t *result = allocate_expression_zero(EXPR_CALL);
3720 call_expression_t *call = &result->call;
3721 call->function = expression;
3723 function_type_t *function_type = NULL;
3724 type_t *orig_type = expression->base.datatype;
3725 if(orig_type != NULL) {
3726 type_t *type = skip_typeref(orig_type);
3728 if(is_type_pointer(type)) {
3729 pointer_type_t *pointer_type = &type->pointer;
3731 type = skip_typeref(pointer_type->points_to);
3733 if (is_type_function(type)) {
3734 function_type = &type->function;
3735 call->expression.datatype = function_type->return_type;
3738 if(function_type == NULL) {
3739 errorf(HERE, "called object '%E' (type '%T') is not a pointer to a function", expression, orig_type);
3741 function_type = NULL;
3742 call->expression.datatype = NULL;
3746 /* parse arguments */
3749 if(token.type != ')') {
3750 call_argument_t *last_argument = NULL;
3753 call_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
3755 argument->expression = parse_assignment_expression();
3756 if(last_argument == NULL) {
3757 call->arguments = argument;
3759 last_argument->next = argument;
3761 last_argument = argument;
3763 if(token.type != ',')
3770 if(function_type != NULL) {
3771 function_parameter_t *parameter = function_type->parameters;
3772 call_argument_t *argument = call->arguments;
3773 for( ; parameter != NULL && argument != NULL;
3774 parameter = parameter->next, argument = argument->next) {
3775 type_t *expected_type = parameter->type;
3776 /* TODO report context in error messages */
3777 argument->expression = create_implicit_cast(argument->expression,
3780 /* too few parameters */
3781 if(parameter != NULL) {
3782 errorf(HERE, "too few arguments to function '%E'", expression);
3783 } else if(argument != NULL) {
3784 /* too many parameters */
3785 if(!function_type->variadic
3786 && !function_type->unspecified_parameters) {
3787 errorf(HERE, "too many arguments to function '%E'", expression);
3789 /* do default promotion */
3790 for( ; argument != NULL; argument = argument->next) {
3791 type_t *type = argument->expression->base.datatype;
3796 type = skip_typeref(type);
3797 if(is_type_integer(type)) {
3798 type = promote_integer(type);
3799 } else if(type == type_float) {
3803 argument->expression
3804 = create_implicit_cast(argument->expression, type);
3807 check_format(&result->call);
3810 check_format(&result->call);
3817 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right);
3819 static bool same_compound_type(const type_t *type1, const type_t *type2)
3821 if(!is_type_compound(type1))
3823 if(type1->kind != type2->kind)
3826 const compound_type_t *compound1 = &type1->compound;
3827 const compound_type_t *compound2 = &type2->compound;
3829 return compound1->declaration == compound2->declaration;
3833 * Parse a conditional expression, ie. 'expression ? ... : ...'.
3835 * @param expression the conditional expression
3837 static expression_t *parse_conditional_expression(unsigned precedence,
3838 expression_t *expression)
3842 expression_t *result = allocate_expression_zero(EXPR_CONDITIONAL);
3844 conditional_expression_t *conditional = &result->conditional;
3845 conditional->condition = expression;
3848 type_t *condition_type_orig = expression->base.datatype;
3849 if(condition_type_orig != NULL) {
3850 type_t *condition_type = skip_typeref(condition_type_orig);
3851 if(condition_type != NULL && !is_type_scalar(condition_type)) {
3852 type_error("expected a scalar type in conditional condition",
3853 expression->base.source_position, condition_type_orig);
3857 expression_t *true_expression = parse_expression();
3859 expression_t *false_expression = parse_sub_expression(precedence);
3861 conditional->true_expression = true_expression;
3862 conditional->false_expression = false_expression;
3864 type_t *orig_true_type = true_expression->base.datatype;
3865 type_t *orig_false_type = false_expression->base.datatype;
3866 if(orig_true_type == NULL || orig_false_type == NULL)
3869 type_t *true_type = skip_typeref(orig_true_type);
3870 type_t *false_type = skip_typeref(orig_false_type);
3873 type_t *result_type = NULL;
3874 if (is_type_arithmetic(true_type) && is_type_arithmetic(false_type)) {
3875 result_type = semantic_arithmetic(true_type, false_type);
3877 true_expression = create_implicit_cast(true_expression, result_type);
3878 false_expression = create_implicit_cast(false_expression, result_type);
3880 conditional->true_expression = true_expression;
3881 conditional->false_expression = false_expression;
3882 conditional->expression.datatype = result_type;
3883 } else if (same_compound_type(true_type, false_type)
3884 || (is_type_atomic(true_type, ATOMIC_TYPE_VOID) &&
3885 is_type_atomic(false_type, ATOMIC_TYPE_VOID))) {
3886 /* just take 1 of the 2 types */
3887 result_type = true_type;
3888 } else if (is_type_pointer(true_type) && is_type_pointer(false_type)
3889 && pointers_compatible(true_type, false_type)) {
3891 result_type = true_type;
3894 type_error_incompatible("while parsing conditional",
3895 expression->base.source_position, true_type,
3899 conditional->expression.datatype = result_type;
3904 * Parse an extension expression.
3906 static expression_t *parse_extension(unsigned precedence)
3908 eat(T___extension__);
3910 /* TODO enable extensions */
3911 expression_t *expression = parse_sub_expression(precedence);
3912 /* TODO disable extensions */
3916 static expression_t *parse_builtin_classify_type(const unsigned precedence)
3918 eat(T___builtin_classify_type);
3920 expression_t *result = allocate_expression_zero(EXPR_CLASSIFY_TYPE);
3921 result->base.datatype = type_int;
3924 expression_t *expression = parse_sub_expression(precedence);
3926 result->classify_type.type_expression = expression;
3931 static void semantic_incdec(unary_expression_t *expression)
3933 type_t *orig_type = expression->value->base.datatype;
3934 if(orig_type == NULL)
3937 type_t *type = skip_typeref(orig_type);
3938 if(!is_type_arithmetic(type) && type->kind != TYPE_POINTER) {
3939 /* TODO: improve error message */
3940 errorf(HERE, "operation needs an arithmetic or pointer type");
3944 expression->expression.datatype = orig_type;
3947 static void semantic_unexpr_arithmetic(unary_expression_t *expression)
3949 type_t *orig_type = expression->value->base.datatype;
3950 if(orig_type == NULL)
3953 type_t *type = skip_typeref(orig_type);
3954 if(!is_type_arithmetic(type)) {
3955 /* TODO: improve error message */
3956 errorf(HERE, "operation needs an arithmetic type");
3960 expression->expression.datatype = orig_type;
3963 static void semantic_unexpr_scalar(unary_expression_t *expression)
3965 type_t *orig_type = expression->value->base.datatype;
3966 if(orig_type == NULL)
3969 type_t *type = skip_typeref(orig_type);
3970 if (!is_type_scalar(type)) {
3971 errorf(HERE, "operand of ! must be of scalar type");
3975 expression->expression.datatype = orig_type;
3978 static void semantic_unexpr_integer(unary_expression_t *expression)
3980 type_t *orig_type = expression->value->base.datatype;
3981 if(orig_type == NULL)
3984 type_t *type = skip_typeref(orig_type);
3985 if (!is_type_integer(type)) {
3986 errorf(HERE, "operand of ~ must be of integer type");
3990 expression->expression.datatype = orig_type;
3993 static void semantic_dereference(unary_expression_t *expression)
3995 type_t *orig_type = expression->value->base.datatype;
3996 if(orig_type == NULL)
3999 type_t *type = skip_typeref(orig_type);
4000 if(!is_type_pointer(type)) {
4001 errorf(HERE, "Unary '*' needs pointer or arrray type, but type '%T' given", orig_type);
4005 pointer_type_t *pointer_type = &type->pointer;
4006 type_t *result_type = pointer_type->points_to;
4008 result_type = automatic_type_conversion(result_type);
4009 expression->expression.datatype = result_type;
4013 * Check the semantic of the address taken expression.
4015 static void semantic_take_addr(unary_expression_t *expression)
4017 expression_t *value = expression->value;
4018 value->base.datatype = revert_automatic_type_conversion(value);
4020 type_t *orig_type = value->base.datatype;
4021 if(orig_type == NULL)
4024 if(value->kind == EXPR_REFERENCE) {
4025 reference_expression_t *reference = (reference_expression_t*) value;
4026 declaration_t *declaration = reference->declaration;
4027 if(declaration != NULL) {
4028 if (declaration->storage_class == STORAGE_CLASS_REGISTER) {
4029 errorf(expression->expression.source_position,
4030 "address of register variable '%Y' requested",
4031 declaration->symbol);
4033 declaration->address_taken = 1;
4037 expression->expression.datatype = make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
4040 #define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type, sfunc) \
4041 static expression_t *parse_##unexpression_type(unsigned precedence) \
4045 expression_t *unary_expression \
4046 = allocate_expression_zero(unexpression_type); \
4047 unary_expression->base.source_position = HERE; \
4048 unary_expression->unary.value = parse_sub_expression(precedence); \
4050 sfunc(&unary_expression->unary); \
4052 return unary_expression; \
4055 CREATE_UNARY_EXPRESSION_PARSER('-', EXPR_UNARY_NEGATE,
4056 semantic_unexpr_arithmetic)
4057 CREATE_UNARY_EXPRESSION_PARSER('+', EXPR_UNARY_PLUS,
4058 semantic_unexpr_arithmetic)
4059 CREATE_UNARY_EXPRESSION_PARSER('!', EXPR_UNARY_NOT,
4060 semantic_unexpr_scalar)
4061 CREATE_UNARY_EXPRESSION_PARSER('*', EXPR_UNARY_DEREFERENCE,
4062 semantic_dereference)
4063 CREATE_UNARY_EXPRESSION_PARSER('&', EXPR_UNARY_TAKE_ADDRESS,
4065 CREATE_UNARY_EXPRESSION_PARSER('~', EXPR_UNARY_BITWISE_NEGATE,
4066 semantic_unexpr_integer)
4067 CREATE_UNARY_EXPRESSION_PARSER(T_PLUSPLUS, EXPR_UNARY_PREFIX_INCREMENT,
4069 CREATE_UNARY_EXPRESSION_PARSER(T_MINUSMINUS, EXPR_UNARY_PREFIX_DECREMENT,
4072 #define CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(token_type, unexpression_type, \
4074 static expression_t *parse_##unexpression_type(unsigned precedence, \
4075 expression_t *left) \
4077 (void) precedence; \
4080 expression_t *unary_expression \
4081 = allocate_expression_zero(unexpression_type); \
4082 unary_expression->unary.value = left; \
4084 sfunc(&unary_expression->unary); \
4086 return unary_expression; \
4089 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_PLUSPLUS,
4090 EXPR_UNARY_POSTFIX_INCREMENT,
4092 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_MINUSMINUS,
4093 EXPR_UNARY_POSTFIX_DECREMENT,
4096 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right)
4098 /* TODO: handle complex + imaginary types */
4100 /* § 6.3.1.8 Usual arithmetic conversions */
4101 if(type_left == type_long_double || type_right == type_long_double) {
4102 return type_long_double;
4103 } else if(type_left == type_double || type_right == type_double) {
4105 } else if(type_left == type_float || type_right == type_float) {
4109 type_right = promote_integer(type_right);
4110 type_left = promote_integer(type_left);
4112 if(type_left == type_right)
4115 bool signed_left = is_type_signed(type_left);
4116 bool signed_right = is_type_signed(type_right);
4117 int rank_left = get_rank(type_left);
4118 int rank_right = get_rank(type_right);
4119 if(rank_left < rank_right) {
4120 if(signed_left == signed_right || !signed_right) {
4126 if(signed_left == signed_right || !signed_left) {
4135 * Check the semantic restrictions for a binary expression.
4137 static void semantic_binexpr_arithmetic(binary_expression_t *expression)
4139 expression_t *left = expression->left;
4140 expression_t *right = expression->right;
4141 type_t *orig_type_left = left->base.datatype;
4142 type_t *orig_type_right = right->base.datatype;
4144 if(orig_type_left == NULL || orig_type_right == NULL)
4147 type_t *type_left = skip_typeref(orig_type_left);
4148 type_t *type_right = skip_typeref(orig_type_right);
4150 if(!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
4151 /* TODO: improve error message */
4152 errorf(HERE, "operation needs arithmetic types");
4156 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
4157 expression->left = create_implicit_cast(left, arithmetic_type);
4158 expression->right = create_implicit_cast(right, arithmetic_type);
4159 expression->expression.datatype = arithmetic_type;
4162 static void semantic_shift_op(binary_expression_t *expression)
4164 expression_t *left = expression->left;
4165 expression_t *right = expression->right;
4166 type_t *orig_type_left = left->base.datatype;
4167 type_t *orig_type_right = right->base.datatype;
4169 if(orig_type_left == NULL || orig_type_right == NULL)
4172 type_t *type_left = skip_typeref(orig_type_left);
4173 type_t *type_right = skip_typeref(orig_type_right);
4175 if(!is_type_integer(type_left) || !is_type_integer(type_right)) {
4176 /* TODO: improve error message */
4177 errorf(HERE, "operation needs integer types");
4181 type_left = promote_integer(type_left);
4182 type_right = promote_integer(type_right);
4184 expression->left = create_implicit_cast(left, type_left);
4185 expression->right = create_implicit_cast(right, type_right);
4186 expression->expression.datatype = type_left;
4189 static void semantic_add(binary_expression_t *expression)
4191 expression_t *left = expression->left;
4192 expression_t *right = expression->right;
4193 type_t *orig_type_left = left->base.datatype;
4194 type_t *orig_type_right = right->base.datatype;
4196 if(orig_type_left == NULL || orig_type_right == NULL)
4199 type_t *type_left = skip_typeref(orig_type_left);
4200 type_t *type_right = skip_typeref(orig_type_right);
4203 if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
4204 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
4205 expression->left = create_implicit_cast(left, arithmetic_type);
4206 expression->right = create_implicit_cast(right, arithmetic_type);
4207 expression->expression.datatype = arithmetic_type;
4209 } else if(is_type_pointer(type_left) && is_type_integer(type_right)) {
4210 expression->expression.datatype = type_left;
4211 } else if(is_type_pointer(type_right) && is_type_integer(type_left)) {
4212 expression->expression.datatype = type_right;
4214 errorf(HERE, "invalid operands to binary + ('%T', '%T')", orig_type_left, orig_type_right);
4218 static void semantic_sub(binary_expression_t *expression)
4220 expression_t *left = expression->left;
4221 expression_t *right = expression->right;
4222 type_t *orig_type_left = left->base.datatype;
4223 type_t *orig_type_right = right->base.datatype;
4225 if(orig_type_left == NULL || orig_type_right == NULL)
4228 type_t *type_left = skip_typeref(orig_type_left);
4229 type_t *type_right = skip_typeref(orig_type_right);
4232 if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
4233 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
4234 expression->left = create_implicit_cast(left, arithmetic_type);
4235 expression->right = create_implicit_cast(right, arithmetic_type);
4236 expression->expression.datatype = arithmetic_type;
4238 } else if(is_type_pointer(type_left) && is_type_integer(type_right)) {
4239 expression->expression.datatype = type_left;
4240 } else if(is_type_pointer(type_left) && is_type_pointer(type_right)) {
4241 if(!pointers_compatible(type_left, type_right)) {
4242 errorf(HERE, "pointers to incompatible objects to binary - ('%T', '%T')", orig_type_left, orig_type_right);
4244 expression->expression.datatype = type_ptrdiff_t;
4247 errorf(HERE, "invalid operands to binary - ('%T', '%T')", orig_type_left, orig_type_right);
4251 static void semantic_comparison(binary_expression_t *expression)
4253 expression_t *left = expression->left;
4254 expression_t *right = expression->right;
4255 type_t *orig_type_left = left->base.datatype;
4256 type_t *orig_type_right = right->base.datatype;
4258 if(orig_type_left == NULL || orig_type_right == NULL)
4261 type_t *type_left = skip_typeref(orig_type_left);
4262 type_t *type_right = skip_typeref(orig_type_right);
4264 /* TODO non-arithmetic types */
4265 if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
4266 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
4267 expression->left = create_implicit_cast(left, arithmetic_type);
4268 expression->right = create_implicit_cast(right, arithmetic_type);
4269 expression->expression.datatype = arithmetic_type;
4270 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
4271 /* TODO check compatibility */
4272 } else if (is_type_pointer(type_left)) {
4273 expression->right = create_implicit_cast(right, type_left);
4274 } else if (is_type_pointer(type_right)) {
4275 expression->left = create_implicit_cast(left, type_right);
4277 type_error_incompatible("invalid operands in comparison",
4278 token.source_position, type_left, type_right);
4280 expression->expression.datatype = type_int;
4283 static void semantic_arithmetic_assign(binary_expression_t *expression)
4285 expression_t *left = expression->left;
4286 expression_t *right = expression->right;
4287 type_t *orig_type_left = left->base.datatype;
4288 type_t *orig_type_right = right->base.datatype;
4290 if(orig_type_left == NULL || orig_type_right == NULL)
4293 type_t *type_left = skip_typeref(orig_type_left);
4294 type_t *type_right = skip_typeref(orig_type_right);
4296 if(!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
4297 /* TODO: improve error message */
4298 errorf(HERE, "operation needs arithmetic types");
4302 /* combined instructions are tricky. We can't create an implicit cast on
4303 * the left side, because we need the uncasted form for the store.
4304 * The ast2firm pass has to know that left_type must be right_type
4305 * for the arithmetic operation and create a cast by itself */
4306 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
4307 expression->right = create_implicit_cast(right, arithmetic_type);
4308 expression->expression.datatype = type_left;
4311 static void semantic_arithmetic_addsubb_assign(binary_expression_t *expression)
4313 expression_t *left = expression->left;
4314 expression_t *right = expression->right;
4315 type_t *orig_type_left = left->base.datatype;
4316 type_t *orig_type_right = right->base.datatype;
4318 if(orig_type_left == NULL || orig_type_right == NULL)
4321 type_t *type_left = skip_typeref(orig_type_left);
4322 type_t *type_right = skip_typeref(orig_type_right);
4324 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
4325 /* combined instructions are tricky. We can't create an implicit cast on
4326 * the left side, because we need the uncasted form for the store.
4327 * The ast2firm pass has to know that left_type must be right_type
4328 * for the arithmetic operation and create a cast by itself */
4329 type_t *const arithmetic_type = semantic_arithmetic(type_left, type_right);
4330 expression->right = create_implicit_cast(right, arithmetic_type);
4331 expression->expression.datatype = type_left;
4332 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
4333 expression->expression.datatype = type_left;
4335 errorf(HERE, "incompatible types '%T' and '%T' in assignment", orig_type_left, orig_type_right);
4341 * Check the semantic restrictions of a logical expression.
4343 static void semantic_logical_op(binary_expression_t *expression)
4345 expression_t *left = expression->left;
4346 expression_t *right = expression->right;
4347 type_t *orig_type_left = left->base.datatype;
4348 type_t *orig_type_right = right->base.datatype;
4350 if(orig_type_left == NULL || orig_type_right == NULL)
4353 type_t *type_left = skip_typeref(orig_type_left);
4354 type_t *type_right = skip_typeref(orig_type_right);
4356 if (!is_type_scalar(type_left) || !is_type_scalar(type_right)) {
4357 /* TODO: improve error message */
4358 errorf(HERE, "operation needs scalar types");
4362 expression->expression.datatype = type_int;
4366 * Checks if a compound type has constant fields.
4368 static bool has_const_fields(const compound_type_t *type)
4370 const context_t *context = &type->declaration->context;
4371 const declaration_t *declaration = context->declarations;
4373 for (; declaration != NULL; declaration = declaration->next) {
4374 if (declaration->namespc != NAMESPACE_NORMAL)
4377 const type_t *decl_type = skip_typeref(declaration->type);
4378 if (decl_type->base.qualifiers & TYPE_QUALIFIER_CONST)
4386 * Check the semantic restrictions of a binary assign expression.
4388 static void semantic_binexpr_assign(binary_expression_t *expression)
4390 expression_t *left = expression->left;
4391 type_t *orig_type_left = left->base.datatype;
4393 if(orig_type_left == NULL)
4396 type_t *type_left = revert_automatic_type_conversion(left);
4397 type_left = skip_typeref(orig_type_left);
4399 /* must be a modifiable lvalue */
4400 if (is_type_array(type_left)) {
4401 errorf(HERE, "cannot assign to arrays ('%E')", left);
4404 if(type_left->base.qualifiers & TYPE_QUALIFIER_CONST) {
4405 errorf(HERE, "assignment to readonly location '%E' (type '%T')", left,
4409 if(is_type_incomplete(type_left)) {
4411 "left-hand side of assignment '%E' has incomplete type '%T'",
4412 left, orig_type_left);
4415 if(is_type_compound(type_left) && has_const_fields(&type_left->compound)) {
4416 errorf(HERE, "cannot assign to '%E' because compound type '%T' has readonly fields",
4417 left, orig_type_left);
4421 semantic_assign(orig_type_left, &expression->right, "assignment");
4423 expression->expression.datatype = orig_type_left;
4426 static void semantic_comma(binary_expression_t *expression)
4428 expression->expression.datatype = expression->right->base.datatype;
4431 #define CREATE_BINEXPR_PARSER(token_type, binexpression_type, sfunc, lr) \
4432 static expression_t *parse_##binexpression_type(unsigned precedence, \
4433 expression_t *left) \
4437 expression_t *right = parse_sub_expression(precedence + lr); \
4439 expression_t *binexpr = allocate_expression_zero(binexpression_type); \
4440 binexpr->binary.left = left; \
4441 binexpr->binary.right = right; \
4442 sfunc(&binexpr->binary); \
4447 CREATE_BINEXPR_PARSER(',', EXPR_BINARY_COMMA, semantic_comma, 1)
4448 CREATE_BINEXPR_PARSER('*', EXPR_BINARY_MUL, semantic_binexpr_arithmetic, 1)
4449 CREATE_BINEXPR_PARSER('/', EXPR_BINARY_DIV, semantic_binexpr_arithmetic, 1)
4450 CREATE_BINEXPR_PARSER('%', EXPR_BINARY_MOD, semantic_binexpr_arithmetic, 1)
4451 CREATE_BINEXPR_PARSER('+', EXPR_BINARY_ADD, semantic_add, 1)
4452 CREATE_BINEXPR_PARSER('-', EXPR_BINARY_SUB, semantic_sub, 1)
4453 CREATE_BINEXPR_PARSER('<', EXPR_BINARY_LESS, semantic_comparison, 1)
4454 CREATE_BINEXPR_PARSER('>', EXPR_BINARY_GREATER, semantic_comparison, 1)
4455 CREATE_BINEXPR_PARSER('=', EXPR_BINARY_ASSIGN, semantic_binexpr_assign, 0)
4457 CREATE_BINEXPR_PARSER(T_EQUALEQUAL, EXPR_BINARY_EQUAL,
4458 semantic_comparison, 1)
4459 CREATE_BINEXPR_PARSER(T_EXCLAMATIONMARKEQUAL, EXPR_BINARY_NOTEQUAL,
4460 semantic_comparison, 1)
4461 CREATE_BINEXPR_PARSER(T_LESSEQUAL, EXPR_BINARY_LESSEQUAL,
4462 semantic_comparison, 1)
4463 CREATE_BINEXPR_PARSER(T_GREATEREQUAL, EXPR_BINARY_GREATEREQUAL,
4464 semantic_comparison, 1)
4466 CREATE_BINEXPR_PARSER('&', EXPR_BINARY_BITWISE_AND,
4467 semantic_binexpr_arithmetic, 1)
4468 CREATE_BINEXPR_PARSER('|', EXPR_BINARY_BITWISE_OR,
4469 semantic_binexpr_arithmetic, 1)
4470 CREATE_BINEXPR_PARSER('^', EXPR_BINARY_BITWISE_XOR,
4471 semantic_binexpr_arithmetic, 1)
4472 CREATE_BINEXPR_PARSER(T_ANDAND, EXPR_BINARY_LOGICAL_AND,
4473 semantic_logical_op, 1)
4474 CREATE_BINEXPR_PARSER(T_PIPEPIPE, EXPR_BINARY_LOGICAL_OR,
4475 semantic_logical_op, 1)
4476 CREATE_BINEXPR_PARSER(T_LESSLESS, EXPR_BINARY_SHIFTLEFT,
4477 semantic_shift_op, 1)
4478 CREATE_BINEXPR_PARSER(T_GREATERGREATER, EXPR_BINARY_SHIFTRIGHT,
4479 semantic_shift_op, 1)
4480 CREATE_BINEXPR_PARSER(T_PLUSEQUAL, EXPR_BINARY_ADD_ASSIGN,
4481 semantic_arithmetic_addsubb_assign, 0)
4482 CREATE_BINEXPR_PARSER(T_MINUSEQUAL, EXPR_BINARY_SUB_ASSIGN,
4483 semantic_arithmetic_addsubb_assign, 0)
4484 CREATE_BINEXPR_PARSER(T_ASTERISKEQUAL, EXPR_BINARY_MUL_ASSIGN,
4485 semantic_arithmetic_assign, 0)
4486 CREATE_BINEXPR_PARSER(T_SLASHEQUAL, EXPR_BINARY_DIV_ASSIGN,
4487 semantic_arithmetic_assign, 0)
4488 CREATE_BINEXPR_PARSER(T_PERCENTEQUAL, EXPR_BINARY_MOD_ASSIGN,
4489 semantic_arithmetic_assign, 0)
4490 CREATE_BINEXPR_PARSER(T_LESSLESSEQUAL, EXPR_BINARY_SHIFTLEFT_ASSIGN,
4491 semantic_arithmetic_assign, 0)
4492 CREATE_BINEXPR_PARSER(T_GREATERGREATEREQUAL, EXPR_BINARY_SHIFTRIGHT_ASSIGN,
4493 semantic_arithmetic_assign, 0)
4494 CREATE_BINEXPR_PARSER(T_ANDEQUAL, EXPR_BINARY_BITWISE_AND_ASSIGN,
4495 semantic_arithmetic_assign, 0)
4496 CREATE_BINEXPR_PARSER(T_PIPEEQUAL, EXPR_BINARY_BITWISE_OR_ASSIGN,
4497 semantic_arithmetic_assign, 0)
4498 CREATE_BINEXPR_PARSER(T_CARETEQUAL, EXPR_BINARY_BITWISE_XOR_ASSIGN,
4499 semantic_arithmetic_assign, 0)
4501 static expression_t *parse_sub_expression(unsigned precedence)
4503 if(token.type < 0) {
4504 return expected_expression_error();
4507 expression_parser_function_t *parser
4508 = &expression_parsers[token.type];
4509 source_position_t source_position = token.source_position;
4512 if(parser->parser != NULL) {
4513 left = parser->parser(parser->precedence);
4515 left = parse_primary_expression();
4517 assert(left != NULL);
4518 left->base.source_position = source_position;
4521 if(token.type < 0) {
4522 return expected_expression_error();
4525 parser = &expression_parsers[token.type];
4526 if(parser->infix_parser == NULL)
4528 if(parser->infix_precedence < precedence)
4531 left = parser->infix_parser(parser->infix_precedence, left);
4533 assert(left != NULL);
4534 assert(left->kind != EXPR_UNKNOWN);
4535 left->base.source_position = source_position;
4542 * Parse an expression.
4544 static expression_t *parse_expression(void)
4546 return parse_sub_expression(1);
4550 * Register a parser for a prefix-like operator with given precedence.
4552 * @param parser the parser function
4553 * @param token_type the token type of the prefix token
4554 * @param precedence the precedence of the operator
4556 static void register_expression_parser(parse_expression_function parser,
4557 int token_type, unsigned precedence)
4559 expression_parser_function_t *entry = &expression_parsers[token_type];
4561 if(entry->parser != NULL) {
4562 diagnosticf("for token '%k'\n", (token_type_t)token_type);
4563 panic("trying to register multiple expression parsers for a token");
4565 entry->parser = parser;
4566 entry->precedence = precedence;
4570 * Register a parser for an infix operator with given precedence.
4572 * @param parser the parser function
4573 * @param token_type the token type of the infix operator
4574 * @param precedence the precedence of the operator
4576 static void register_infix_parser(parse_expression_infix_function parser,
4577 int token_type, unsigned precedence)
4579 expression_parser_function_t *entry = &expression_parsers[token_type];
4581 if(entry->infix_parser != NULL) {
4582 diagnosticf("for token '%k'\n", (token_type_t)token_type);
4583 panic("trying to register multiple infix expression parsers for a "
4586 entry->infix_parser = parser;
4587 entry->infix_precedence = precedence;
4591 * Initialize the expression parsers.
4593 static void init_expression_parsers(void)
4595 memset(&expression_parsers, 0, sizeof(expression_parsers));
4597 register_infix_parser(parse_array_expression, '[', 30);
4598 register_infix_parser(parse_call_expression, '(', 30);
4599 register_infix_parser(parse_select_expression, '.', 30);
4600 register_infix_parser(parse_select_expression, T_MINUSGREATER, 30);
4601 register_infix_parser(parse_EXPR_UNARY_POSTFIX_INCREMENT,
4603 register_infix_parser(parse_EXPR_UNARY_POSTFIX_DECREMENT,
4606 register_infix_parser(parse_EXPR_BINARY_MUL, '*', 16);
4607 register_infix_parser(parse_EXPR_BINARY_DIV, '/', 16);
4608 register_infix_parser(parse_EXPR_BINARY_MOD, '%', 16);
4609 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT, T_LESSLESS, 16);
4610 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT, T_GREATERGREATER, 16);
4611 register_infix_parser(parse_EXPR_BINARY_ADD, '+', 15);
4612 register_infix_parser(parse_EXPR_BINARY_SUB, '-', 15);
4613 register_infix_parser(parse_EXPR_BINARY_LESS, '<', 14);
4614 register_infix_parser(parse_EXPR_BINARY_GREATER, '>', 14);
4615 register_infix_parser(parse_EXPR_BINARY_LESSEQUAL, T_LESSEQUAL, 14);
4616 register_infix_parser(parse_EXPR_BINARY_GREATEREQUAL, T_GREATEREQUAL, 14);
4617 register_infix_parser(parse_EXPR_BINARY_EQUAL, T_EQUALEQUAL, 13);
4618 register_infix_parser(parse_EXPR_BINARY_NOTEQUAL,
4619 T_EXCLAMATIONMARKEQUAL, 13);
4620 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND, '&', 12);
4621 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR, '^', 11);
4622 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR, '|', 10);
4623 register_infix_parser(parse_EXPR_BINARY_LOGICAL_AND, T_ANDAND, 9);
4624 register_infix_parser(parse_EXPR_BINARY_LOGICAL_OR, T_PIPEPIPE, 8);
4625 register_infix_parser(parse_conditional_expression, '?', 7);
4626 register_infix_parser(parse_EXPR_BINARY_ASSIGN, '=', 2);
4627 register_infix_parser(parse_EXPR_BINARY_ADD_ASSIGN, T_PLUSEQUAL, 2);
4628 register_infix_parser(parse_EXPR_BINARY_SUB_ASSIGN, T_MINUSEQUAL, 2);
4629 register_infix_parser(parse_EXPR_BINARY_MUL_ASSIGN, T_ASTERISKEQUAL, 2);
4630 register_infix_parser(parse_EXPR_BINARY_DIV_ASSIGN, T_SLASHEQUAL, 2);
4631 register_infix_parser(parse_EXPR_BINARY_MOD_ASSIGN, T_PERCENTEQUAL, 2);
4632 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT_ASSIGN,
4633 T_LESSLESSEQUAL, 2);
4634 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT_ASSIGN,
4635 T_GREATERGREATEREQUAL, 2);
4636 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND_ASSIGN,
4638 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR_ASSIGN,
4640 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR_ASSIGN,
4643 register_infix_parser(parse_EXPR_BINARY_COMMA, ',', 1);
4645 register_expression_parser(parse_EXPR_UNARY_NEGATE, '-', 25);
4646 register_expression_parser(parse_EXPR_UNARY_PLUS, '+', 25);
4647 register_expression_parser(parse_EXPR_UNARY_NOT, '!', 25);
4648 register_expression_parser(parse_EXPR_UNARY_BITWISE_NEGATE, '~', 25);
4649 register_expression_parser(parse_EXPR_UNARY_DEREFERENCE, '*', 25);
4650 register_expression_parser(parse_EXPR_UNARY_TAKE_ADDRESS, '&', 25);
4651 register_expression_parser(parse_EXPR_UNARY_PREFIX_INCREMENT,
4653 register_expression_parser(parse_EXPR_UNARY_PREFIX_DECREMENT,
4655 register_expression_parser(parse_sizeof, T_sizeof, 25);
4656 register_expression_parser(parse_extension, T___extension__, 25);
4657 register_expression_parser(parse_builtin_classify_type,
4658 T___builtin_classify_type, 25);
4662 * Parse a asm statement constraints specification.
4664 static asm_constraint_t *parse_asm_constraints(void)
4666 asm_constraint_t *result = NULL;
4667 asm_constraint_t *last = NULL;
4669 while(token.type == T_STRING_LITERAL || token.type == '[') {
4670 asm_constraint_t *constraint = allocate_ast_zero(sizeof(constraint[0]));
4671 memset(constraint, 0, sizeof(constraint[0]));
4673 if(token.type == '[') {
4675 if(token.type != T_IDENTIFIER) {
4676 parse_error_expected("while parsing asm constraint",
4680 constraint->symbol = token.v.symbol;
4685 constraint->constraints = parse_string_literals();
4687 constraint->expression = parse_expression();
4691 last->next = constraint;
4693 result = constraint;
4697 if(token.type != ',')
4706 * Parse a asm statement clobber specification.
4708 static asm_clobber_t *parse_asm_clobbers(void)
4710 asm_clobber_t *result = NULL;
4711 asm_clobber_t *last = NULL;
4713 while(token.type == T_STRING_LITERAL) {
4714 asm_clobber_t *clobber = allocate_ast_zero(sizeof(clobber[0]));
4715 clobber->clobber = parse_string_literals();
4718 last->next = clobber;
4724 if(token.type != ',')
4733 * Parse an asm statement.
4735 static statement_t *parse_asm_statement(void)
4739 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
4740 statement->base.source_position = token.source_position;
4742 asm_statement_t *asm_statement = &statement->asms;
4744 if(token.type == T_volatile) {
4746 asm_statement->is_volatile = true;
4750 asm_statement->asm_text = parse_string_literals();
4752 if(token.type != ':')
4756 asm_statement->inputs = parse_asm_constraints();
4757 if(token.type != ':')
4761 asm_statement->outputs = parse_asm_constraints();
4762 if(token.type != ':')
4766 asm_statement->clobbers = parse_asm_clobbers();
4775 * Parse a case statement.
4777 static statement_t *parse_case_statement(void)
4781 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
4783 statement->base.source_position = token.source_position;
4784 statement->case_label.expression = parse_expression();
4787 statement->case_label.label_statement = parse_statement();
4793 * Parse a default statement.
4795 static statement_t *parse_default_statement(void)
4799 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
4801 statement->base.source_position = token.source_position;
4804 statement->label.label_statement = parse_statement();
4810 * Return the declaration for a given label symbol or create a new one.
4812 static declaration_t *get_label(symbol_t *symbol)
4814 declaration_t *candidate = get_declaration(symbol, NAMESPACE_LABEL);
4815 assert(current_function != NULL);
4816 /* if we found a label in the same function, then we already created the
4818 if(candidate != NULL
4819 && candidate->parent_context == ¤t_function->context) {
4823 /* otherwise we need to create a new one */
4824 declaration_t *declaration = allocate_ast_zero(sizeof(declaration[0]));
4825 declaration->namespc = NAMESPACE_LABEL;
4826 declaration->symbol = symbol;
4828 label_push(declaration);
4834 * Parse a label statement.
4836 static statement_t *parse_label_statement(void)
4838 assert(token.type == T_IDENTIFIER);
4839 symbol_t *symbol = token.v.symbol;
4842 declaration_t *label = get_label(symbol);
4844 /* if source position is already set then the label is defined twice,
4845 * otherwise it was just mentioned in a goto so far */
4846 if(label->source_position.input_name != NULL) {
4847 errorf(HERE, "duplicate label '%Y'", symbol);
4848 errorf(label->source_position, "previous definition of '%Y' was here",
4851 label->source_position = token.source_position;
4854 label_statement_t *label_statement = allocate_ast_zero(sizeof(label[0]));
4856 label_statement->statement.kind = STATEMENT_LABEL;
4857 label_statement->statement.source_position = token.source_position;
4858 label_statement->label = label;
4862 if(token.type == '}') {
4863 /* TODO only warn? */
4864 errorf(HERE, "label at end of compound statement");
4865 return (statement_t*) label_statement;
4867 label_statement->label_statement = parse_statement();
4870 return (statement_t*) label_statement;
4874 * Parse an if statement.
4876 static statement_t *parse_if(void)
4880 if_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
4881 statement->statement.kind = STATEMENT_IF;
4882 statement->statement.source_position = token.source_position;
4885 statement->condition = parse_expression();
4888 statement->true_statement = parse_statement();
4889 if(token.type == T_else) {
4891 statement->false_statement = parse_statement();
4894 return (statement_t*) statement;
4898 * Parse a switch statement.
4900 static statement_t *parse_switch(void)
4904 switch_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
4905 statement->statement.kind = STATEMENT_SWITCH;
4906 statement->statement.source_position = token.source_position;
4909 statement->expression = parse_expression();
4911 statement->body = parse_statement();
4913 return (statement_t*) statement;
4917 * Parse a while statement.
4919 static statement_t *parse_while(void)
4923 while_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
4924 statement->statement.kind = STATEMENT_WHILE;
4925 statement->statement.source_position = token.source_position;
4928 statement->condition = parse_expression();
4930 statement->body = parse_statement();
4932 return (statement_t*) statement;
4936 * Parse a do statement.
4938 static statement_t *parse_do(void)
4942 do_while_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
4943 statement->statement.kind = STATEMENT_DO_WHILE;
4944 statement->statement.source_position = token.source_position;
4946 statement->body = parse_statement();
4949 statement->condition = parse_expression();
4953 return (statement_t*) statement;
4957 * Parse a for statement.
4959 static statement_t *parse_for(void)
4963 for_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
4964 statement->statement.kind = STATEMENT_FOR;
4965 statement->statement.source_position = token.source_position;
4969 int top = environment_top();
4970 context_t *last_context = context;
4971 set_context(&statement->context);
4973 if(token.type != ';') {
4974 if(is_declaration_specifier(&token, false)) {
4975 parse_declaration(record_declaration);
4977 statement->initialisation = parse_expression();
4984 if(token.type != ';') {
4985 statement->condition = parse_expression();
4988 if(token.type != ')') {
4989 statement->step = parse_expression();
4992 statement->body = parse_statement();
4994 assert(context == &statement->context);
4995 set_context(last_context);
4996 environment_pop_to(top);
4998 return (statement_t*) statement;
5002 * Parse a goto statement.
5004 static statement_t *parse_goto(void)
5008 if(token.type != T_IDENTIFIER) {
5009 parse_error_expected("while parsing goto", T_IDENTIFIER, 0);
5013 symbol_t *symbol = token.v.symbol;
5016 declaration_t *label = get_label(symbol);
5018 goto_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
5020 statement->statement.kind = STATEMENT_GOTO;
5021 statement->statement.source_position = token.source_position;
5023 statement->label = label;
5027 return (statement_t*) statement;
5031 * Parse a continue statement.
5033 static statement_t *parse_continue(void)
5038 statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
5039 statement->kind = STATEMENT_CONTINUE;
5040 statement->base.source_position = token.source_position;
5046 * Parse a break statement.
5048 static statement_t *parse_break(void)
5053 statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
5054 statement->kind = STATEMENT_BREAK;
5055 statement->base.source_position = token.source_position;
5061 * Parse a return statement.
5063 static statement_t *parse_return(void)
5067 return_statement_t *statement = allocate_ast_zero(sizeof(statement[0]));
5069 statement->statement.kind = STATEMENT_RETURN;
5070 statement->statement.source_position = token.source_position;
5072 assert(is_type_function(current_function->type));
5073 function_type_t *function_type = ¤t_function->type->function;
5074 type_t *return_type = function_type->return_type;
5076 expression_t *return_value = NULL;
5077 if(token.type != ';') {
5078 return_value = parse_expression();
5082 if(return_type == NULL)
5083 return (statement_t*) statement;
5084 if(return_value != NULL && return_value->base.datatype == NULL)
5085 return (statement_t*) statement;
5087 return_type = skip_typeref(return_type);
5089 if(return_value != NULL) {
5090 type_t *return_value_type = skip_typeref(return_value->base.datatype);
5092 if(is_type_atomic(return_type, ATOMIC_TYPE_VOID)
5093 && !is_type_atomic(return_value_type, ATOMIC_TYPE_VOID)) {
5094 warningf(HERE, "'return' with a value, in function returning void");
5095 return_value = NULL;
5097 if(return_type != NULL) {
5098 semantic_assign(return_type, &return_value, "'return'");
5102 if(!is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
5103 warningf(HERE, "'return' without value, in function returning non-void");
5106 statement->return_value = return_value;
5108 return (statement_t*) statement;
5112 * Parse a declaration statement.
5114 static statement_t *parse_declaration_statement(void)
5116 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
5118 statement->base.source_position = token.source_position;
5120 declaration_t *before = last_declaration;
5121 parse_declaration(record_declaration);
5123 if(before == NULL) {
5124 statement->declaration.declarations_begin = context->declarations;
5126 statement->declaration.declarations_begin = before->next;
5128 statement->declaration.declarations_end = last_declaration;
5134 * Parse an expression statement, ie. expr ';'.
5136 static statement_t *parse_expression_statement(void)
5138 statement_t *statement = allocate_statement_zero(STATEMENT_EXPRESSION);
5140 statement->base.source_position = token.source_position;
5141 statement->expression.expression = parse_expression();
5149 * Parse a statement.
5151 static statement_t *parse_statement(void)
5153 statement_t *statement = NULL;
5155 /* declaration or statement */
5156 switch(token.type) {
5158 statement = parse_asm_statement();
5162 statement = parse_case_statement();
5166 statement = parse_default_statement();
5170 statement = parse_compound_statement();
5174 statement = parse_if();
5178 statement = parse_switch();
5182 statement = parse_while();
5186 statement = parse_do();
5190 statement = parse_for();
5194 statement = parse_goto();
5198 statement = parse_continue();
5202 statement = parse_break();
5206 statement = parse_return();
5215 if(look_ahead(1)->type == ':') {
5216 statement = parse_label_statement();
5220 if(is_typedef_symbol(token.v.symbol)) {
5221 statement = parse_declaration_statement();
5225 statement = parse_expression_statement();
5228 case T___extension__:
5229 /* this can be a prefix to a declaration or an expression statement */
5230 /* we simply eat it now and parse the rest with tail recursion */
5233 } while(token.type == T___extension__);
5234 statement = parse_statement();
5238 statement = parse_declaration_statement();
5242 statement = parse_expression_statement();
5246 assert(statement == NULL
5247 || statement->base.source_position.input_name != NULL);
5253 * Parse a compound statement.
5255 static statement_t *parse_compound_statement(void)
5257 compound_statement_t *compound_statement
5258 = allocate_ast_zero(sizeof(compound_statement[0]));
5259 compound_statement->statement.kind = STATEMENT_COMPOUND;
5260 compound_statement->statement.source_position = token.source_position;
5264 int top = environment_top();
5265 context_t *last_context = context;
5266 set_context(&compound_statement->context);
5268 statement_t *last_statement = NULL;
5270 while(token.type != '}' && token.type != T_EOF) {
5271 statement_t *statement = parse_statement();
5272 if(statement == NULL)
5275 if(last_statement != NULL) {
5276 last_statement->base.next = statement;
5278 compound_statement->statements = statement;
5281 while(statement->base.next != NULL)
5282 statement = statement->base.next;
5284 last_statement = statement;
5287 if(token.type == '}') {
5290 errorf(compound_statement->statement.source_position, "end of file while looking for closing '}'");
5293 assert(context == &compound_statement->context);
5294 set_context(last_context);
5295 environment_pop_to(top);
5297 return (statement_t*) compound_statement;
5301 * Initialize builtin types.
5303 static void initialize_builtin_types(void)
5305 type_intmax_t = make_global_typedef("__intmax_t__", type_long_long);
5306 type_size_t = make_global_typedef("__SIZE_TYPE__", type_unsigned_long);
5307 type_ssize_t = make_global_typedef("__SSIZE_TYPE__", type_long);
5308 type_ptrdiff_t = make_global_typedef("__PTRDIFF_TYPE__", type_long);
5309 type_uintmax_t = make_global_typedef("__uintmax_t__", type_unsigned_long_long);
5310 type_uptrdiff_t = make_global_typedef("__UPTRDIFF_TYPE__", type_unsigned_long);
5311 type_wchar_t = make_global_typedef("__WCHAR_TYPE__", type_int);
5312 type_wint_t = make_global_typedef("__WINT_TYPE__", type_int);
5314 type_intmax_t_ptr = make_pointer_type(type_intmax_t, TYPE_QUALIFIER_NONE);
5315 type_ptrdiff_t_ptr = make_pointer_type(type_ptrdiff_t, TYPE_QUALIFIER_NONE);
5316 type_ssize_t_ptr = make_pointer_type(type_ssize_t, TYPE_QUALIFIER_NONE);
5317 type_wchar_t_ptr = make_pointer_type(type_wchar_t, TYPE_QUALIFIER_NONE);
5321 * Parse a translation unit.
5323 static translation_unit_t *parse_translation_unit(void)
5325 translation_unit_t *unit = allocate_ast_zero(sizeof(unit[0]));
5327 assert(global_context == NULL);
5328 global_context = &unit->context;
5330 assert(context == NULL);
5331 set_context(&unit->context);
5333 initialize_builtin_types();
5335 while(token.type != T_EOF) {
5336 if (token.type == ';') {
5337 /* TODO error in strict mode */
5338 warningf(HERE, "stray ';' outside of function");
5341 parse_external_declaration();
5345 assert(context == &unit->context);
5347 last_declaration = NULL;
5349 assert(global_context == &unit->context);
5350 global_context = NULL;
5358 * @return the translation unit or NULL if errors occurred.
5360 translation_unit_t *parse(void)
5362 environment_stack = NEW_ARR_F(stack_entry_t, 0);
5363 label_stack = NEW_ARR_F(stack_entry_t, 0);
5364 diagnostic_count = 0;
5368 type_set_output(stderr);
5369 ast_set_output(stderr);
5371 lookahead_bufpos = 0;
5372 for(int i = 0; i < MAX_LOOKAHEAD + 2; ++i) {
5375 translation_unit_t *unit = parse_translation_unit();
5377 DEL_ARR_F(environment_stack);
5378 DEL_ARR_F(label_stack);
5387 * Initialize the parser.
5389 void init_parser(void)
5391 init_expression_parsers();
5392 obstack_init(&temp_obst);
5394 symbol_t *const va_list_sym = symbol_table_insert("__builtin_va_list");
5395 type_valist = create_builtin_type(va_list_sym, type_void_ptr);
5399 * Terminate the parser.
5401 void exit_parser(void)
5403 obstack_free(&temp_obst, NULL);